1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 5963541927SFilipe David Borba Manana #include "props.h" 603b02a68aSJeff Mahoney #include "sysfs.h" 61fcebe456SJosef Bacik #include "qgroup.h" 62f46b5a66SChristoph Hellwig 63abccd00fSHugo Mills #ifdef CONFIG_64BIT 64abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 65abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 66abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 67abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 68abccd00fSHugo Mills */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 70abccd00fSHugo Mills __u64 sec; 71abccd00fSHugo Mills __u32 nsec; 72abccd00fSHugo Mills } __attribute__ ((__packed__)); 73abccd00fSHugo Mills 74abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 75abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 76abccd00fSHugo Mills __u64 stransid; /* in */ 77abccd00fSHugo Mills __u64 rtransid; /* out */ 78abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 79abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 80abccd00fSHugo Mills __u64 flags; /* in */ 81abccd00fSHugo Mills __u64 reserved[16]; /* in */ 82abccd00fSHugo Mills } __attribute__ ((__packed__)); 83abccd00fSHugo Mills 84abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 85abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 86abccd00fSHugo Mills #endif 87abccd00fSHugo Mills 88abccd00fSHugo Mills 89416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 901c919a5eSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff, 911c919a5eSMark Fasheh int no_time_update); 92416161dbSMark Fasheh 936cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 946cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 956cbff00fSChristoph Hellwig { 966cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 976cbff00fSChristoph Hellwig return flags; 986cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 996cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1006cbff00fSChristoph Hellwig else 1016cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1026cbff00fSChristoph Hellwig } 103f46b5a66SChristoph Hellwig 1046cbff00fSChristoph Hellwig /* 1056cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1066cbff00fSChristoph Hellwig */ 1076cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1086cbff00fSChristoph Hellwig { 1096cbff00fSChristoph Hellwig unsigned int iflags = 0; 1106cbff00fSChristoph Hellwig 1116cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1126cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1136cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1146cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1166cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1186cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1206cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1216cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1226cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 123d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 124d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 125d0092bddSLi Zefan 126d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 127d0092bddSLi Zefan iflags |= FS_COMPR_FL; 128d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 129d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig return iflags; 1326cbff00fSChristoph Hellwig } 1336cbff00fSChristoph Hellwig 1346cbff00fSChristoph Hellwig /* 1356cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1366cbff00fSChristoph Hellwig */ 1376cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1386cbff00fSChristoph Hellwig { 1396cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1403cc79392SFilipe Manana unsigned int new_fl = 0; 1416cbff00fSChristoph Hellwig 1426cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1433cc79392SFilipe Manana new_fl |= S_SYNC; 1446cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1453cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1466cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1473cc79392SFilipe Manana new_fl |= S_APPEND; 1486cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1493cc79392SFilipe Manana new_fl |= S_NOATIME; 1506cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1513cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1523cc79392SFilipe Manana 1533cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1543cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1553cc79392SFilipe Manana new_fl); 1566cbff00fSChristoph Hellwig } 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig /* 1596cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1606cbff00fSChristoph Hellwig * 161e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1626cbff00fSChristoph Hellwig */ 1636cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1646cbff00fSChristoph Hellwig { 1650b4dcea5SChris Mason unsigned int flags; 1660b4dcea5SChris Mason 1670b4dcea5SChris Mason if (!dir) 1680b4dcea5SChris Mason return; 1690b4dcea5SChris Mason 1700b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1716cbff00fSChristoph Hellwig 172e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 173e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 174e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 175e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 176e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 177e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 178e27425d6SJosef Bacik } 1796cbff00fSChristoph Hellwig 180213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 181e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 182213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 183213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 184213490b3SLiu Bo } 185e27425d6SJosef Bacik 1866cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1876cbff00fSChristoph Hellwig } 1886cbff00fSChristoph Hellwig 1896cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1906cbff00fSChristoph Hellwig { 191496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1926cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1936cbff00fSChristoph Hellwig 1946cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1956cbff00fSChristoph Hellwig return -EFAULT; 1966cbff00fSChristoph Hellwig return 0; 1976cbff00fSChristoph Hellwig } 1986cbff00fSChristoph Hellwig 19975e7cb7fSLiu Bo static int check_flags(unsigned int flags) 20075e7cb7fSLiu Bo { 20175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 204e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 205e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20675e7cb7fSLiu Bo return -EOPNOTSUPP; 20775e7cb7fSLiu Bo 20875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20975e7cb7fSLiu Bo return -EINVAL; 21075e7cb7fSLiu Bo 21175e7cb7fSLiu Bo return 0; 21275e7cb7fSLiu Bo } 21375e7cb7fSLiu Bo 2146cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2156cbff00fSChristoph Hellwig { 216496ad9aaSAl Viro struct inode *inode = file_inode(file); 2176cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2186cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2196cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2206cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2216cbff00fSChristoph Hellwig int ret; 222f062abf0SLi Zefan u64 ip_oldflags; 223f062abf0SLi Zefan unsigned int i_oldflags; 2247e97b8daSDavid Sterba umode_t mode; 2256cbff00fSChristoph Hellwig 226bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 227bd60ea0fSDavid Sterba return -EPERM; 228bd60ea0fSDavid Sterba 229b83cc969SLi Zefan if (btrfs_root_readonly(root)) 230b83cc969SLi Zefan return -EROFS; 231b83cc969SLi Zefan 2326cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2336cbff00fSChristoph Hellwig return -EFAULT; 2346cbff00fSChristoph Hellwig 23575e7cb7fSLiu Bo ret = check_flags(flags); 23675e7cb7fSLiu Bo if (ret) 23775e7cb7fSLiu Bo return ret; 2386cbff00fSChristoph Hellwig 239e7848683SJan Kara ret = mnt_want_write_file(file); 240e7848683SJan Kara if (ret) 241e7848683SJan Kara return ret; 242e7848683SJan Kara 2436cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2446cbff00fSChristoph Hellwig 245f062abf0SLi Zefan ip_oldflags = ip->flags; 246f062abf0SLi Zefan i_oldflags = inode->i_flags; 2477e97b8daSDavid Sterba mode = inode->i_mode; 248f062abf0SLi Zefan 2496cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2506cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2516cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2526cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2536cbff00fSChristoph Hellwig ret = -EPERM; 2546cbff00fSChristoph Hellwig goto out_unlock; 2556cbff00fSChristoph Hellwig } 2566cbff00fSChristoph Hellwig } 2576cbff00fSChristoph Hellwig 2586cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2596cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2606cbff00fSChristoph Hellwig else 2616cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2626cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2636cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2646cbff00fSChristoph Hellwig else 2656cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2666cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2676cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2686cbff00fSChristoph Hellwig else 2696cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2706cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2716cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2726cbff00fSChristoph Hellwig else 2736cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2746cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2756cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2766cbff00fSChristoph Hellwig else 2776cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2786cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2796cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2806cbff00fSChristoph Hellwig else 2816cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2827e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2837e97b8daSDavid Sterba if (S_ISREG(mode)) { 2847e97b8daSDavid Sterba /* 2857e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2867e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2877e97b8daSDavid Sterba * status of the file and will not set it. 2887e97b8daSDavid Sterba */ 2897e97b8daSDavid Sterba if (inode->i_size == 0) 2907e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2917e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2927e97b8daSDavid Sterba } else { 293e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2947e97b8daSDavid Sterba } 2957e97b8daSDavid Sterba } else { 2967e97b8daSDavid Sterba /* 2977e97b8daSDavid Sterba * Revert back under same assuptions as above 2987e97b8daSDavid Sterba */ 2997e97b8daSDavid Sterba if (S_ISREG(mode)) { 3007e97b8daSDavid Sterba if (inode->i_size == 0) 3017e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 3027e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 3037e97b8daSDavid Sterba } else { 304e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3057e97b8daSDavid Sterba } 3067e97b8daSDavid Sterba } 3076cbff00fSChristoph Hellwig 30875e7cb7fSLiu Bo /* 30975e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 31075e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 31175e7cb7fSLiu Bo * things smaller. 31275e7cb7fSLiu Bo */ 31375e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 31475e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31663541927SFilipe David Borba Manana 31763541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31863541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31963541927SFilipe David Borba Manana goto out_drop; 32075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 32163541927SFilipe David Borba Manana const char *comp; 32263541927SFilipe David Borba Manana 32375e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 32475e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32563541927SFilipe David Borba Manana 32663541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32763541927SFilipe David Borba Manana comp = "lzo"; 32863541927SFilipe David Borba Manana else 32963541927SFilipe David Borba Manana comp = "zlib"; 33063541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 33163541927SFilipe David Borba Manana comp, strlen(comp), 0); 33263541927SFilipe David Borba Manana if (ret) 33363541927SFilipe David Borba Manana goto out_drop; 33463541927SFilipe David Borba Manana 335ebcb904dSLi Zefan } else { 33678a017a2SFilipe Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 33778a017a2SFilipe Manana if (ret && ret != -ENODATA) 33878a017a2SFilipe Manana goto out_drop; 339ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 34075e7cb7fSLiu Bo } 3416cbff00fSChristoph Hellwig 3424da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 343f062abf0SLi Zefan if (IS_ERR(trans)) { 344f062abf0SLi Zefan ret = PTR_ERR(trans); 345f062abf0SLi Zefan goto out_drop; 346f062abf0SLi Zefan } 3476cbff00fSChristoph Hellwig 348306424ccSLi Zefan btrfs_update_iflags(inode); 3490c4d2d95SJosef Bacik inode_inc_iversion(inode); 350306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3516cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3526cbff00fSChristoph Hellwig 3536cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 354f062abf0SLi Zefan out_drop: 355f062abf0SLi Zefan if (ret) { 356f062abf0SLi Zefan ip->flags = ip_oldflags; 357f062abf0SLi Zefan inode->i_flags = i_oldflags; 358f062abf0SLi Zefan } 3596cbff00fSChristoph Hellwig 3606cbff00fSChristoph Hellwig out_unlock: 3616cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 362e7848683SJan Kara mnt_drop_write_file(file); 3632d4e6f6aSliubo return ret; 3646cbff00fSChristoph Hellwig } 3656cbff00fSChristoph Hellwig 3666cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3676cbff00fSChristoph Hellwig { 368496ad9aaSAl Viro struct inode *inode = file_inode(file); 3696cbff00fSChristoph Hellwig 3706cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3716cbff00fSChristoph Hellwig } 372f46b5a66SChristoph Hellwig 373f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 374f7039b1dSLi Dongyang { 37554563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 376f7039b1dSLi Dongyang struct btrfs_device *device; 377f7039b1dSLi Dongyang struct request_queue *q; 378f7039b1dSLi Dongyang struct fstrim_range range; 379f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 380f7039b1dSLi Dongyang u64 num_devices = 0; 381815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 382f7039b1dSLi Dongyang int ret; 383f7039b1dSLi Dongyang 384f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 385f7039b1dSLi Dongyang return -EPERM; 386f7039b1dSLi Dongyang 3871f78160cSXiao Guangrong rcu_read_lock(); 3881f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3891f78160cSXiao Guangrong dev_list) { 390f7039b1dSLi Dongyang if (!device->bdev) 391f7039b1dSLi Dongyang continue; 392f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 393f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 394f7039b1dSLi Dongyang num_devices++; 395f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 396f7039b1dSLi Dongyang minlen); 397f7039b1dSLi Dongyang } 398f7039b1dSLi Dongyang } 3991f78160cSXiao Guangrong rcu_read_unlock(); 400f4c697e6SLukas Czerner 401f7039b1dSLi Dongyang if (!num_devices) 402f7039b1dSLi Dongyang return -EOPNOTSUPP; 403f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 404f7039b1dSLi Dongyang return -EFAULT; 405e515c18bSLukas Czerner if (range.start > total_bytes || 406e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 407f4c697e6SLukas Czerner return -EINVAL; 408f7039b1dSLi Dongyang 409f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 410f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 411815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 412f7039b1dSLi Dongyang if (ret < 0) 413f7039b1dSLi Dongyang return ret; 414f7039b1dSLi Dongyang 415f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 416f7039b1dSLi Dongyang return -EFAULT; 417f7039b1dSLi Dongyang 418f7039b1dSLi Dongyang return 0; 419f7039b1dSLi Dongyang } 420f7039b1dSLi Dongyang 421dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 422dd5f9615SStefan Behrens { 42346e0f66aSChris Mason int i; 42446e0f66aSChris Mason 42546e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 42646e0f66aSChris Mason if (uuid[i]) 42746e0f66aSChris Mason return 0; 42846e0f66aSChris Mason } 42946e0f66aSChris Mason return 1; 430dd5f9615SStefan Behrens } 431dd5f9615SStefan Behrens 432d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 433cb8e7090SChristoph Hellwig struct dentry *dentry, 43472fd032eSSage Weil char *name, int namelen, 4356f72c7e2SArne Jansen u64 *async_transid, 4368696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 437f46b5a66SChristoph Hellwig { 438f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 439f46b5a66SChristoph Hellwig struct btrfs_key key; 440f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 441f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 442f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 443d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 44476dda93cSYan, Zheng struct btrfs_root *new_root; 445d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4468ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4475662344bSTsutomu Itoh struct inode *inode; 448f46b5a66SChristoph Hellwig int ret; 449f46b5a66SChristoph Hellwig int err; 450f46b5a66SChristoph Hellwig u64 objectid; 451f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4523de4586cSChris Mason u64 index = 0; 453d5c12070SMiao Xie u64 qgroup_reserved; 4548ea05e3aSAlexander Block uuid_le new_uuid; 455f46b5a66SChristoph Hellwig 456581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4572fbe8c8aSAl Viro if (ret) 458a22285a6SYan, Zheng return ret; 4596a912213SJosef Bacik 460e09fe2d2SQu Wenruo /* 461e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 462e09fe2d2SQu Wenruo * screwed up since it assume subvolme qgroup's level to be 0. 463e09fe2d2SQu Wenruo */ 464e09fe2d2SQu Wenruo if (btrfs_qgroup_level(objectid)) 465e09fe2d2SQu Wenruo return -ENOSPC; 466e09fe2d2SQu Wenruo 467d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4689ed74f2dSJosef Bacik /* 469d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 470d5c12070SMiao Xie * of create_snapshot(). 4719ed74f2dSJosef Bacik */ 472d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 473dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 474d5c12070SMiao Xie if (ret) 475d5c12070SMiao Xie return ret; 476f46b5a66SChristoph Hellwig 477d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 478d5c12070SMiao Xie if (IS_ERR(trans)) { 479d5c12070SMiao Xie ret = PTR_ERR(trans); 480de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 481de6e8200SLiu Bo qgroup_reserved); 482de6e8200SLiu Bo return ret; 483d5c12070SMiao Xie } 484d5c12070SMiao Xie trans->block_rsv = &block_rsv; 485d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 486f46b5a66SChristoph Hellwig 4878696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4886f72c7e2SArne Jansen if (ret) 4896f72c7e2SArne Jansen goto fail; 4906f72c7e2SArne Jansen 4914d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 4928e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4938e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4948e8a1e31SJosef Bacik goto fail; 4958e8a1e31SJosef Bacik } 496f46b5a66SChristoph Hellwig 4975d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 498f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 499f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 5005d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 501f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 502f46b5a66SChristoph Hellwig 5030a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 504f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 5055d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 506b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 5075d4f98a2SYan Zheng BTRFS_UUID_SIZE); 508f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 509f46b5a66SChristoph Hellwig 5108ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 5118ea05e3aSAlexander Block 512f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5133cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5143cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5153cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 516707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 5173cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 518f46b5a66SChristoph Hellwig 5193cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5203cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5213cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 52208fe4db1SLi Zefan 523f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 52484234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 525f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 526f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 52786b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 52880ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 529f46b5a66SChristoph Hellwig 5308ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5318ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5328ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5338ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5343cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5353cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5368ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5378ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5388ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 539f46b5a66SChristoph Hellwig 540925baeddSChris Mason btrfs_tree_unlock(leaf); 541f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 542f46b5a66SChristoph Hellwig leaf = NULL; 543f46b5a66SChristoph Hellwig 544f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 545f46b5a66SChristoph Hellwig 546f46b5a66SChristoph Hellwig key.objectid = objectid; 5475d4f98a2SYan Zheng key.offset = 0; 548962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 549f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 550f46b5a66SChristoph Hellwig &root_item); 551f46b5a66SChristoph Hellwig if (ret) 552f46b5a66SChristoph Hellwig goto fail; 553f46b5a66SChristoph Hellwig 55476dda93cSYan, Zheng key.offset = (u64)-1; 55576dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 55679787eaaSJeff Mahoney if (IS_ERR(new_root)) { 55779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 5586d13f549SDavid Sterba btrfs_abort_transaction(trans, root, ret); 55979787eaaSJeff Mahoney goto fail; 56079787eaaSJeff Mahoney } 56176dda93cSYan, Zheng 56276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 56376dda93cSYan, Zheng 56463541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 565ce598979SMark Fasheh if (ret) { 566ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 56779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 568ce598979SMark Fasheh goto fail; 569ce598979SMark Fasheh } 570ce598979SMark Fasheh 571f46b5a66SChristoph Hellwig /* 572f46b5a66SChristoph Hellwig * insert the directory item 573f46b5a66SChristoph Hellwig */ 5743de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 57579787eaaSJeff Mahoney if (ret) { 57679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 57779787eaaSJeff Mahoney goto fail; 57879787eaaSJeff Mahoney } 5793de4586cSChris Mason 5803de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 58116cdcec7SMiao Xie name, namelen, dir, &key, 5823de4586cSChris Mason BTRFS_FT_DIR, index); 58379787eaaSJeff Mahoney if (ret) { 58479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 585f46b5a66SChristoph Hellwig goto fail; 58679787eaaSJeff Mahoney } 5870660b5afSChris Mason 58852c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 58952c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 59052c26179SYan Zheng BUG_ON(ret); 59152c26179SYan Zheng 5920660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5934df27c4dSYan, Zheng objectid, root->root_key.objectid, 59433345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5950660b5afSChris Mason BUG_ON(ret); 5960660b5afSChris Mason 597dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 598dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 599dd5f9615SStefan Behrens objectid); 600dd5f9615SStefan Behrens if (ret) 601dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 602dd5f9615SStefan Behrens 603f46b5a66SChristoph Hellwig fail: 604d5c12070SMiao Xie trans->block_rsv = NULL; 605d5c12070SMiao Xie trans->bytes_reserved = 0; 606de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 607de6e8200SLiu Bo 60872fd032eSSage Weil if (async_transid) { 60972fd032eSSage Weil *async_transid = trans->transid; 61072fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 61100d71c9cSMiao Xie if (err) 61200d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 61372fd032eSSage Weil } else { 61476dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 61572fd032eSSage Weil } 616f46b5a66SChristoph Hellwig if (err && !ret) 617f46b5a66SChristoph Hellwig ret = err; 6181a65e24bSChris Mason 6195662344bSTsutomu Itoh if (!ret) { 6205662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 621de6e8200SLiu Bo if (IS_ERR(inode)) 622de6e8200SLiu Bo return PTR_ERR(inode); 6235662344bSTsutomu Itoh d_instantiate(dentry, inode); 6245662344bSTsutomu Itoh } 625f46b5a66SChristoph Hellwig return ret; 626f46b5a66SChristoph Hellwig } 627f46b5a66SChristoph Hellwig 6289ea24bbeSFilipe Manana static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) 6298257b2dcSMiao Xie { 6308257b2dcSMiao Xie s64 writers; 6318257b2dcSMiao Xie DEFINE_WAIT(wait); 6328257b2dcSMiao Xie 6338257b2dcSMiao Xie do { 6348257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6358257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6368257b2dcSMiao Xie 6378257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6388257b2dcSMiao Xie if (writers) 6398257b2dcSMiao Xie schedule(); 6408257b2dcSMiao Xie 6418257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6428257b2dcSMiao Xie } while (writers); 6438257b2dcSMiao Xie } 6448257b2dcSMiao Xie 645e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 646e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 647e9662f70SMiao Xie u64 *async_transid, bool readonly, 648e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 649f46b5a66SChristoph Hellwig { 6502e4bfab9SYan, Zheng struct inode *inode; 651f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 652f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6532e4bfab9SYan, Zheng int ret; 654f46b5a66SChristoph Hellwig 65527cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 656f46b5a66SChristoph Hellwig return -EINVAL; 657f46b5a66SChristoph Hellwig 658a1ee7362SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 659a1ee7362SDavid Sterba if (!pending_snapshot) 660a1ee7362SDavid Sterba return -ENOMEM; 661a1ee7362SDavid Sterba 662b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 663b0c0ea63SDavid Sterba GFP_NOFS); 664b0c0ea63SDavid Sterba if (!pending_snapshot->root_item) { 665b0c0ea63SDavid Sterba ret = -ENOMEM; 666b0c0ea63SDavid Sterba goto free_pending; 667b0c0ea63SDavid Sterba } 668b0c0ea63SDavid Sterba 6698257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6704e857c58SPeter Zijlstra smp_mb__after_atomic(); 6719ea24bbeSFilipe Manana btrfs_wait_for_no_snapshoting_writes(root); 6728257b2dcSMiao Xie 6736a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6746a03843dSMiao Xie if (ret) 675a1ee7362SDavid Sterba goto dec_and_free; 6766a03843dSMiao Xie 677b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6786a03843dSMiao Xie 67966d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 68066d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 681d5c12070SMiao Xie /* 682d5c12070SMiao Xie * 1 - parent dir inode 683d5c12070SMiao Xie * 2 - dir entries 684d5c12070SMiao Xie * 1 - root item 685d5c12070SMiao Xie * 2 - root ref/backref 686d5c12070SMiao Xie * 1 - root of snapshot 687dd5f9615SStefan Behrens * 1 - UUID item 688d5c12070SMiao Xie */ 689d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 690dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 691ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 692ee3441b4SJeff Mahoney false); 693d5c12070SMiao Xie if (ret) 694a1ee7362SDavid Sterba goto dec_and_free; 695d5c12070SMiao Xie 696a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 697a22285a6SYan, Zheng pending_snapshot->root = root; 698b83cc969SLi Zefan pending_snapshot->readonly = readonly; 699e9662f70SMiao Xie pending_snapshot->dir = dir; 7008696c533SMiao Xie pending_snapshot->inherit = inherit; 701a22285a6SYan, Zheng 702d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 703a22285a6SYan, Zheng if (IS_ERR(trans)) { 704a22285a6SYan, Zheng ret = PTR_ERR(trans); 705a22285a6SYan, Zheng goto fail; 706a22285a6SYan, Zheng } 707a22285a6SYan, Zheng 7088351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 709a22285a6SYan, Zheng list_add(&pending_snapshot->list, 710a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7118351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 71272fd032eSSage Weil if (async_transid) { 71372fd032eSSage Weil *async_transid = trans->transid; 71472fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 71572fd032eSSage Weil root->fs_info->extent_root, 1); 71600d71c9cSMiao Xie if (ret) 71700d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 71872fd032eSSage Weil } else { 71972fd032eSSage Weil ret = btrfs_commit_transaction(trans, 72072fd032eSSage Weil root->fs_info->extent_root); 72172fd032eSSage Weil } 722aec8030aSMiao Xie if (ret) 723c37b2b62SJosef Bacik goto fail; 724a22285a6SYan, Zheng 725a22285a6SYan, Zheng ret = pending_snapshot->error; 726f46b5a66SChristoph Hellwig if (ret) 7272e4bfab9SYan, Zheng goto fail; 728f46b5a66SChristoph Hellwig 729d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 730d3797308SChris Mason if (ret) 731d3797308SChris Mason goto fail; 732d3797308SChris Mason 7332b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7342e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7352e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7362e4bfab9SYan, Zheng goto fail; 7372e4bfab9SYan, Zheng } 7385662344bSTsutomu Itoh 7392e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7402e4bfab9SYan, Zheng ret = 0; 7412e4bfab9SYan, Zheng fail: 742d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 743d5c12070SMiao Xie &pending_snapshot->block_rsv, 744d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 745a1ee7362SDavid Sterba dec_and_free: 7469ea24bbeSFilipe Manana if (atomic_dec_and_test(&root->will_be_snapshoted)) 7479ea24bbeSFilipe Manana wake_up_atomic_t(&root->will_be_snapshoted); 748b0c0ea63SDavid Sterba free_pending: 749b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 750a1ee7362SDavid Sterba kfree(pending_snapshot); 751a1ee7362SDavid Sterba 752f46b5a66SChristoph Hellwig return ret; 753f46b5a66SChristoph Hellwig } 754f46b5a66SChristoph Hellwig 7554260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7564260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7574260f7c7SSage Weil * whether the type of victim is right. 7584260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7594260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7604260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7614260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7624260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7634260f7c7SSage Weil * a. be owner of dir, or 7644260f7c7SSage Weil * b. be owner of victim, or 7654260f7c7SSage Weil * c. have CAP_FOWNER capability 7664260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7674260f7c7SSage Weil * links pointing to it. 7684260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7694260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7704260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7714260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7724260f7c7SSage Weil * nfs_async_unlink(). 7734260f7c7SSage Weil */ 7744260f7c7SSage Weil 7754260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7764260f7c7SSage Weil { 7774260f7c7SSage Weil int error; 7784260f7c7SSage Weil 7792b0143b5SDavid Howells if (d_really_is_negative(victim)) 7804260f7c7SSage Weil return -ENOENT; 7814260f7c7SSage Weil 7822b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 7834fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7844260f7c7SSage Weil 7854260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7864260f7c7SSage Weil if (error) 7874260f7c7SSage Weil return error; 7884260f7c7SSage Weil if (IS_APPEND(dir)) 7894260f7c7SSage Weil return -EPERM; 7902b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 7912b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 7924260f7c7SSage Weil return -EPERM; 7934260f7c7SSage Weil if (isdir) { 794e36cb0b8SDavid Howells if (!d_is_dir(victim)) 7954260f7c7SSage Weil return -ENOTDIR; 7964260f7c7SSage Weil if (IS_ROOT(victim)) 7974260f7c7SSage Weil return -EBUSY; 798e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 7994260f7c7SSage Weil return -EISDIR; 8004260f7c7SSage Weil if (IS_DEADDIR(dir)) 8014260f7c7SSage Weil return -ENOENT; 8024260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8034260f7c7SSage Weil return -EBUSY; 8044260f7c7SSage Weil return 0; 8054260f7c7SSage Weil } 8064260f7c7SSage Weil 807cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 808cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 809cb8e7090SChristoph Hellwig { 8102b0143b5SDavid Howells if (d_really_is_positive(child)) 811cb8e7090SChristoph Hellwig return -EEXIST; 812cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 813cb8e7090SChristoph Hellwig return -ENOENT; 814cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 815cb8e7090SChristoph Hellwig } 816cb8e7090SChristoph Hellwig 817cb8e7090SChristoph Hellwig /* 818cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 819cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 820cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 821cb8e7090SChristoph Hellwig */ 82276dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 82376dda93cSYan, Zheng char *name, int namelen, 82472fd032eSSage Weil struct btrfs_root *snap_src, 8256f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8268696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 827cb8e7090SChristoph Hellwig { 8282b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 829cb8e7090SChristoph Hellwig struct dentry *dentry; 830cb8e7090SChristoph Hellwig int error; 831cb8e7090SChristoph Hellwig 8325c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8335c50c9b8SDavid Sterba if (error == -EINTR) 8345c50c9b8SDavid Sterba return error; 835cb8e7090SChristoph Hellwig 836cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 837cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 838cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 839cb8e7090SChristoph Hellwig goto out_unlock; 840cb8e7090SChristoph Hellwig 841cb8e7090SChristoph Hellwig error = -EEXIST; 8422b0143b5SDavid Howells if (d_really_is_positive(dentry)) 843cb8e7090SChristoph Hellwig goto out_dput; 844cb8e7090SChristoph Hellwig 84576dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 846cb8e7090SChristoph Hellwig if (error) 847a874a63eSLiu Bo goto out_dput; 848cb8e7090SChristoph Hellwig 8499c52057cSChris Mason /* 8509c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8519c52057cSChris Mason * check for them now when we can safely fail 8529c52057cSChris Mason */ 8539c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8549c52057cSChris Mason dir->i_ino, name, 8559c52057cSChris Mason namelen); 8569c52057cSChris Mason if (error) 8579c52057cSChris Mason goto out_dput; 8589c52057cSChris Mason 85976dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 86076dda93cSYan, Zheng 86176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 86276dda93cSYan, Zheng goto out_up_read; 86376dda93cSYan, Zheng 8643de4586cSChris Mason if (snap_src) { 865e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8666f72c7e2SArne Jansen async_transid, readonly, inherit); 8673de4586cSChris Mason } else { 868d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 869d5c12070SMiao Xie async_transid, inherit); 8703de4586cSChris Mason } 87176dda93cSYan, Zheng if (!error) 87276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 87376dda93cSYan, Zheng out_up_read: 87476dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 875cb8e7090SChristoph Hellwig out_dput: 876cb8e7090SChristoph Hellwig dput(dentry); 877cb8e7090SChristoph Hellwig out_unlock: 87876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 879cb8e7090SChristoph Hellwig return error; 880cb8e7090SChristoph Hellwig } 881cb8e7090SChristoph Hellwig 8824cb5300bSChris Mason /* 8834cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8844cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8854cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8864cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8874cb5300bSChris Mason * part of the file 8884cb5300bSChris Mason */ 889aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 8904cb5300bSChris Mason { 8914cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8924cb5300bSChris Mason struct extent_map *em = NULL; 8934cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8944cb5300bSChris Mason u64 end; 8954cb5300bSChris Mason 8964cb5300bSChris Mason read_lock(&em_tree->lock); 8974cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8984cb5300bSChris Mason read_unlock(&em_tree->lock); 8994cb5300bSChris Mason 9004cb5300bSChris Mason if (em) { 9014cb5300bSChris Mason end = extent_map_end(em); 9024cb5300bSChris Mason free_extent_map(em); 9034cb5300bSChris Mason if (end - offset > thresh) 9044cb5300bSChris Mason return 0; 9054cb5300bSChris Mason } 9064cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9074cb5300bSChris Mason thresh /= 2; 9084cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9094cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9104cb5300bSChris Mason if (end >= thresh) 9114cb5300bSChris Mason return 0; 9124cb5300bSChris Mason return 1; 9134cb5300bSChris Mason } 9144cb5300bSChris Mason 9154cb5300bSChris Mason /* 9164cb5300bSChris Mason * helper function to walk through a file and find extents 9174cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9184cb5300bSChris Mason * 9194cb5300bSChris Mason * This is used by the defragging code to find new and small 9204cb5300bSChris Mason * extents 9214cb5300bSChris Mason */ 9224cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9234cb5300bSChris Mason struct inode *inode, u64 newer_than, 924aab110abSDavid Sterba u64 *off, u32 thresh) 9254cb5300bSChris Mason { 9264cb5300bSChris Mason struct btrfs_path *path; 9274cb5300bSChris Mason struct btrfs_key min_key; 9284cb5300bSChris Mason struct extent_buffer *leaf; 9294cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9304cb5300bSChris Mason int type; 9314cb5300bSChris Mason int ret; 932a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9334cb5300bSChris Mason 9344cb5300bSChris Mason path = btrfs_alloc_path(); 9354cb5300bSChris Mason if (!path) 9364cb5300bSChris Mason return -ENOMEM; 9374cb5300bSChris Mason 938a4689d2bSDavid Sterba min_key.objectid = ino; 9394cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9404cb5300bSChris Mason min_key.offset = *off; 9414cb5300bSChris Mason 9424cb5300bSChris Mason while (1) { 9436174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9444cb5300bSChris Mason if (ret != 0) 9454cb5300bSChris Mason goto none; 946f094c9bdSFilipe Manana process_slot: 947a4689d2bSDavid Sterba if (min_key.objectid != ino) 9484cb5300bSChris Mason goto none; 9494cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9504cb5300bSChris Mason goto none; 9514cb5300bSChris Mason 9524cb5300bSChris Mason leaf = path->nodes[0]; 9534cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9544cb5300bSChris Mason struct btrfs_file_extent_item); 9554cb5300bSChris Mason 9564cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9574cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9584cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9594cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9604cb5300bSChris Mason *off = min_key.offset; 9614cb5300bSChris Mason btrfs_free_path(path); 9624cb5300bSChris Mason return 0; 9634cb5300bSChris Mason } 9644cb5300bSChris Mason 965f094c9bdSFilipe Manana path->slots[0]++; 966f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 967f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 968f094c9bdSFilipe Manana goto process_slot; 969f094c9bdSFilipe Manana } 970f094c9bdSFilipe Manana 9714cb5300bSChris Mason if (min_key.offset == (u64)-1) 9724cb5300bSChris Mason goto none; 9734cb5300bSChris Mason 9744cb5300bSChris Mason min_key.offset++; 9754cb5300bSChris Mason btrfs_release_path(path); 9764cb5300bSChris Mason } 9774cb5300bSChris Mason none: 9784cb5300bSChris Mason btrfs_free_path(path); 9794cb5300bSChris Mason return -ENOENT; 9804cb5300bSChris Mason } 9814cb5300bSChris Mason 9826c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98317ce6ef8SLiu Bo { 98417ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 985940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9866c282eb4SLi Zefan struct extent_map *em; 9876c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 988940100a4SChris Mason 989940100a4SChris Mason /* 990940100a4SChris Mason * hopefully we have this extent in the tree already, try without 991940100a4SChris Mason * the full extent lock 992940100a4SChris Mason */ 993940100a4SChris Mason read_lock(&em_tree->lock); 994940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 995940100a4SChris Mason read_unlock(&em_tree->lock); 996940100a4SChris Mason 997940100a4SChris Mason if (!em) { 998308d9800SFilipe Manana struct extent_state *cached = NULL; 999308d9800SFilipe Manana u64 end = start + len - 1; 1000308d9800SFilipe Manana 1001940100a4SChris Mason /* get the big lock and read metadata off disk */ 1002308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 1003940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1004308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1005940100a4SChris Mason 10066cf8bfbfSDan Carpenter if (IS_ERR(em)) 10076c282eb4SLi Zefan return NULL; 1008940100a4SChris Mason } 1009940100a4SChris Mason 10106c282eb4SLi Zefan return em; 10116c282eb4SLi Zefan } 10126c282eb4SLi Zefan 10136c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10146c282eb4SLi Zefan { 10156c282eb4SLi Zefan struct extent_map *next; 10166c282eb4SLi Zefan bool ret = true; 10176c282eb4SLi Zefan 10186c282eb4SLi Zefan /* this is the last extent */ 10196c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10206c282eb4SLi Zefan return false; 10216c282eb4SLi Zefan 10226c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1023e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1024e9512d72SChris Mason ret = false; 1025e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1026e9512d72SChris Mason (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) 10276c282eb4SLi Zefan ret = false; 10286c282eb4SLi Zefan 10296c282eb4SLi Zefan free_extent_map(next); 10306c282eb4SLi Zefan return ret; 10316c282eb4SLi Zefan } 10326c282eb4SLi Zefan 1033aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1034a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1035a43a2111SAndrew Mahone int compress) 10366c282eb4SLi Zefan { 10376c282eb4SLi Zefan struct extent_map *em; 10386c282eb4SLi Zefan int ret = 1; 10396c282eb4SLi Zefan bool next_mergeable = true; 10404a3560c4SLiu Bo bool prev_mergeable = true; 10416c282eb4SLi Zefan 10426c282eb4SLi Zefan /* 10436c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10446c282eb4SLi Zefan * defragging it 10456c282eb4SLi Zefan */ 10466c282eb4SLi Zefan if (start < *defrag_end) 10476c282eb4SLi Zefan return 1; 10486c282eb4SLi Zefan 10496c282eb4SLi Zefan *skip = 0; 10506c282eb4SLi Zefan 10516c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10526c282eb4SLi Zefan if (!em) 10536c282eb4SLi Zefan return 0; 10546c282eb4SLi Zefan 1055940100a4SChris Mason /* this will cover holes, and inline extents */ 105617ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1057940100a4SChris Mason ret = 0; 105817ce6ef8SLiu Bo goto out; 105917ce6ef8SLiu Bo } 106017ce6ef8SLiu Bo 10614a3560c4SLiu Bo if (!*defrag_end) 10624a3560c4SLiu Bo prev_mergeable = false; 10634a3560c4SLiu Bo 10646c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1065940100a4SChris Mason /* 10666c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10676c282eb4SLi Zefan * real extent, don't bother defragging it 1068940100a4SChris Mason */ 1069a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10704a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1071940100a4SChris Mason ret = 0; 107217ce6ef8SLiu Bo out: 1073940100a4SChris Mason /* 1074940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1075940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1076940100a4SChris Mason * so that the next tiny extent will force a defrag. 1077940100a4SChris Mason * 1078940100a4SChris Mason * The end result of this is that tiny extents before a single big 1079940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1080940100a4SChris Mason */ 1081940100a4SChris Mason if (ret) { 1082940100a4SChris Mason *defrag_end = extent_map_end(em); 1083940100a4SChris Mason } else { 1084940100a4SChris Mason *last_len = 0; 1085940100a4SChris Mason *skip = extent_map_end(em); 1086940100a4SChris Mason *defrag_end = 0; 1087940100a4SChris Mason } 1088940100a4SChris Mason 1089940100a4SChris Mason free_extent_map(em); 1090940100a4SChris Mason return ret; 1091940100a4SChris Mason } 1092940100a4SChris Mason 10934cb5300bSChris Mason /* 10944cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10954cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10964cb5300bSChris Mason * to COW and defrag. 10974cb5300bSChris Mason * 10984cb5300bSChris Mason * It also makes sure the delalloc code has enough 10994cb5300bSChris Mason * dirty data to avoid making new small extents as part 11004cb5300bSChris Mason * of the defrag 11014cb5300bSChris Mason * 11024cb5300bSChris Mason * It's a good idea to start RA on this range 11034cb5300bSChris Mason * before calling this. 11044cb5300bSChris Mason */ 11054cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11064cb5300bSChris Mason struct page **pages, 11074cb5300bSChris Mason unsigned long start_index, 1108c41570c9SJustin Maggard unsigned long num_pages) 1109f46b5a66SChristoph Hellwig { 11104cb5300bSChris Mason unsigned long file_end; 11114cb5300bSChris Mason u64 isize = i_size_read(inode); 1112f46b5a66SChristoph Hellwig u64 page_start; 1113f46b5a66SChristoph Hellwig u64 page_end; 11141f12bd06SLiu Bo u64 page_cnt; 11154cb5300bSChris Mason int ret; 11164cb5300bSChris Mason int i; 11174cb5300bSChris Mason int i_done; 11184cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11194cb5300bSChris Mason struct extent_state *cached_state = NULL; 1120600a45e1SMiao Xie struct extent_io_tree *tree; 11213b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11224cb5300bSChris Mason 11234cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11241f12bd06SLiu Bo if (!isize || start_index > file_end) 11251f12bd06SLiu Bo return 0; 11261f12bd06SLiu Bo 11271f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11284cb5300bSChris Mason 11294cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 1130df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 11311f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11324cb5300bSChris Mason if (ret) 11334cb5300bSChris Mason return ret; 11344cb5300bSChris Mason i_done = 0; 1135600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11364cb5300bSChris Mason 11374cb5300bSChris Mason /* step one, lock all the pages */ 11381f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11394cb5300bSChris Mason struct page *page; 1140600a45e1SMiao Xie again: 1141a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11423b16a4e3SJosef Bacik start_index + i, mask); 11434cb5300bSChris Mason if (!page) 11444cb5300bSChris Mason break; 11454cb5300bSChris Mason 1146600a45e1SMiao Xie page_start = page_offset(page); 1147600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1148600a45e1SMiao Xie while (1) { 1149308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1150308d9800SFilipe Manana 0, &cached_state); 1151600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1152600a45e1SMiao Xie page_start); 1153308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1154308d9800SFilipe Manana &cached_state, GFP_NOFS); 1155600a45e1SMiao Xie if (!ordered) 1156600a45e1SMiao Xie break; 1157600a45e1SMiao Xie 1158600a45e1SMiao Xie unlock_page(page); 1159600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1160600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1161600a45e1SMiao Xie lock_page(page); 11621f12bd06SLiu Bo /* 11631f12bd06SLiu Bo * we unlocked the page above, so we need check if 11641f12bd06SLiu Bo * it was released or not. 11651f12bd06SLiu Bo */ 11661f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11671f12bd06SLiu Bo unlock_page(page); 11681f12bd06SLiu Bo page_cache_release(page); 11691f12bd06SLiu Bo goto again; 11701f12bd06SLiu Bo } 1171600a45e1SMiao Xie } 1172600a45e1SMiao Xie 11734cb5300bSChris Mason if (!PageUptodate(page)) { 11744cb5300bSChris Mason btrfs_readpage(NULL, page); 11754cb5300bSChris Mason lock_page(page); 11764cb5300bSChris Mason if (!PageUptodate(page)) { 11774cb5300bSChris Mason unlock_page(page); 11784cb5300bSChris Mason page_cache_release(page); 11794cb5300bSChris Mason ret = -EIO; 11804cb5300bSChris Mason break; 11814cb5300bSChris Mason } 11824cb5300bSChris Mason } 1183600a45e1SMiao Xie 1184600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1185600a45e1SMiao Xie unlock_page(page); 1186600a45e1SMiao Xie page_cache_release(page); 1187600a45e1SMiao Xie goto again; 1188600a45e1SMiao Xie } 1189600a45e1SMiao Xie 11904cb5300bSChris Mason pages[i] = page; 11914cb5300bSChris Mason i_done++; 11924cb5300bSChris Mason } 11934cb5300bSChris Mason if (!i_done || ret) 11944cb5300bSChris Mason goto out; 11954cb5300bSChris Mason 11964cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11974cb5300bSChris Mason goto out; 11984cb5300bSChris Mason 11994cb5300bSChris Mason /* 12004cb5300bSChris Mason * so now we have a nice long stream of locked 12014cb5300bSChris Mason * and up to date pages, lets wait on them 12024cb5300bSChris Mason */ 12034cb5300bSChris Mason for (i = 0; i < i_done; i++) 12044cb5300bSChris Mason wait_on_page_writeback(pages[i]); 12054cb5300bSChris Mason 12064cb5300bSChris Mason page_start = page_offset(pages[0]); 12074cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12084cb5300bSChris Mason 12094cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1210d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 12114cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12124cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12139e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12149e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12154cb5300bSChris Mason 12161f12bd06SLiu Bo if (i_done != page_cnt) { 12179e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12189e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12199e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12204cb5300bSChris Mason btrfs_delalloc_release_space(inode, 1221df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 12221f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12234cb5300bSChris Mason } 12244cb5300bSChris Mason 12254cb5300bSChris Mason 12269e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12279e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12284cb5300bSChris Mason 12294cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12304cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12314cb5300bSChris Mason GFP_NOFS); 12324cb5300bSChris Mason 12334cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12344cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12354cb5300bSChris Mason ClearPageChecked(pages[i]); 12364cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12374cb5300bSChris Mason set_page_dirty(pages[i]); 12384cb5300bSChris Mason unlock_page(pages[i]); 12394cb5300bSChris Mason page_cache_release(pages[i]); 12404cb5300bSChris Mason } 12414cb5300bSChris Mason return i_done; 12424cb5300bSChris Mason out: 12434cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12444cb5300bSChris Mason unlock_page(pages[i]); 12454cb5300bSChris Mason page_cache_release(pages[i]); 12464cb5300bSChris Mason } 12477cf5b976SQu Wenruo btrfs_delalloc_release_space(inode, 1248df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 1249df480633SQu Wenruo page_cnt << PAGE_CACHE_SHIFT); 12504cb5300bSChris Mason return ret; 12514cb5300bSChris Mason 12524cb5300bSChris Mason } 12534cb5300bSChris Mason 12544cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12554cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12564cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12574cb5300bSChris Mason { 12584cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12594cb5300bSChris Mason struct file_ra_state *ra = NULL; 12604cb5300bSChris Mason unsigned long last_index; 1261151a31b2SLi Zefan u64 isize = i_size_read(inode); 1262940100a4SChris Mason u64 last_len = 0; 1263940100a4SChris Mason u64 skip = 0; 1264940100a4SChris Mason u64 defrag_end = 0; 12654cb5300bSChris Mason u64 newer_off = range->start; 1266f46b5a66SChristoph Hellwig unsigned long i; 1267008873eaSLi Zefan unsigned long ra_index = 0; 1268f46b5a66SChristoph Hellwig int ret; 12694cb5300bSChris Mason int defrag_count = 0; 12701a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1271aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 1272c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1273c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12744cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12754cb5300bSChris Mason struct page **pages = NULL; 12764cb5300bSChris Mason 12770abd5b17SLiu Bo if (isize == 0) 12780abd5b17SLiu Bo return 0; 12790abd5b17SLiu Bo 12800abd5b17SLiu Bo if (range->start >= isize) 12810abd5b17SLiu Bo return -EINVAL; 12821a419d85SLi Zefan 12831a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12841a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12851a419d85SLi Zefan return -EINVAL; 12861a419d85SLi Zefan if (range->compress_type) 12871a419d85SLi Zefan compress_type = range->compress_type; 12881a419d85SLi Zefan } 1289f46b5a66SChristoph Hellwig 12900abd5b17SLiu Bo if (extent_thresh == 0) 12910abd5b17SLiu Bo extent_thresh = 256 * 1024; 1292f46b5a66SChristoph Hellwig 12934cb5300bSChris Mason /* 12944cb5300bSChris Mason * if we were not given a file, allocate a readahead 12954cb5300bSChris Mason * context 12964cb5300bSChris Mason */ 12974cb5300bSChris Mason if (!file) { 12984cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12994cb5300bSChris Mason if (!ra) 13004cb5300bSChris Mason return -ENOMEM; 13014cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 13024cb5300bSChris Mason } else { 13034cb5300bSChris Mason ra = &file->f_ra; 13044cb5300bSChris Mason } 13054cb5300bSChris Mason 1306d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 13074cb5300bSChris Mason GFP_NOFS); 13084cb5300bSChris Mason if (!pages) { 13094cb5300bSChris Mason ret = -ENOMEM; 13104cb5300bSChris Mason goto out_ra; 13114cb5300bSChris Mason } 13124cb5300bSChris Mason 13134cb5300bSChris Mason /* find the last page to defrag */ 13141e701a32SChris Mason if (range->start + range->len > range->start) { 1315151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13161e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13171e701a32SChris Mason } else { 1318151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13191e701a32SChris Mason } 13201e701a32SChris Mason 13214cb5300bSChris Mason if (newer_than) { 13224cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13234cb5300bSChris Mason &newer_off, 64 * 1024); 13244cb5300bSChris Mason if (!ret) { 13254cb5300bSChris Mason range->start = newer_off; 13264cb5300bSChris Mason /* 13274cb5300bSChris Mason * we always align our defrag to help keep 13284cb5300bSChris Mason * the extents in the file evenly spaced 13294cb5300bSChris Mason */ 13304cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13314cb5300bSChris Mason } else 13324cb5300bSChris Mason goto out_ra; 13334cb5300bSChris Mason } else { 13341e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13354cb5300bSChris Mason } 13364cb5300bSChris Mason if (!max_to_defrag) 1337070034bdSchandan max_to_defrag = last_index - i + 1; 13384cb5300bSChris Mason 13392a0f7f57SLi Zefan /* 13402a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13412a0f7f57SLi Zefan * written sequentially. 13422a0f7f57SLi Zefan */ 13432a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13442a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13452a0f7f57SLi Zefan 1346f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1347ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13484cb5300bSChris Mason /* 13494cb5300bSChris Mason * make sure we stop running if someone unmounts 13504cb5300bSChris Mason * the FS 13514cb5300bSChris Mason */ 13524cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13534cb5300bSChris Mason break; 13544cb5300bSChris Mason 1355210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1356f14d104dSDavid Sterba btrfs_debug(root->fs_info, "defrag_file cancelled"); 1357210549ebSDavid Sterba ret = -EAGAIN; 1358210549ebSDavid Sterba break; 1359210549ebSDavid Sterba } 1360210549ebSDavid Sterba 136166c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13626c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1363a43a2111SAndrew Mahone &defrag_end, range->flags & 1364a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1365940100a4SChris Mason unsigned long next; 1366940100a4SChris Mason /* 1367940100a4SChris Mason * the should_defrag function tells us how much to skip 1368940100a4SChris Mason * bump our counter by the suggested amount 1369940100a4SChris Mason */ 1370ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1371940100a4SChris Mason i = max(i + 1, next); 1372940100a4SChris Mason continue; 1373940100a4SChris Mason } 1374008873eaSLi Zefan 1375008873eaSLi Zefan if (!newer_than) { 1376008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1377008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1378008873eaSLi Zefan cluster = min(cluster, max_cluster); 1379008873eaSLi Zefan } else { 1380008873eaSLi Zefan cluster = max_cluster; 1381008873eaSLi Zefan } 1382008873eaSLi Zefan 1383008873eaSLi Zefan if (i + cluster > ra_index) { 1384008873eaSLi Zefan ra_index = max(i, ra_index); 1385008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1386008873eaSLi Zefan cluster); 1387e4826a5bSchandan ra_index += cluster; 1388008873eaSLi Zefan } 13894cb5300bSChris Mason 1390ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1391633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1392633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1393008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1394ecb8bea8SLiu Bo if (ret < 0) { 1395ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13964cb5300bSChris Mason goto out_ra; 1397ecb8bea8SLiu Bo } 13984cb5300bSChris Mason 13994cb5300bSChris Mason defrag_count += ret; 1400d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1401ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 14024cb5300bSChris Mason 14034cb5300bSChris Mason if (newer_than) { 14044cb5300bSChris Mason if (newer_off == (u64)-1) 14054cb5300bSChris Mason break; 14064cb5300bSChris Mason 1407e1f041e1SLiu Bo if (ret > 0) 1408e1f041e1SLiu Bo i += ret; 1409e1f041e1SLiu Bo 14104cb5300bSChris Mason newer_off = max(newer_off + 1, 14114cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14124cb5300bSChris Mason 14134cb5300bSChris Mason ret = find_new_extents(root, inode, 14144cb5300bSChris Mason newer_than, &newer_off, 14154cb5300bSChris Mason 64 * 1024); 14164cb5300bSChris Mason if (!ret) { 14174cb5300bSChris Mason range->start = newer_off; 14184cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14194cb5300bSChris Mason } else { 14204cb5300bSChris Mason break; 1421940100a4SChris Mason } 14224cb5300bSChris Mason } else { 1423008873eaSLi Zefan if (ret > 0) { 1424cbcc8326SLi Zefan i += ret; 1425008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1426008873eaSLi Zefan } else { 1427940100a4SChris Mason i++; 1428008873eaSLi Zefan last_len = 0; 1429008873eaSLi Zefan } 1430f46b5a66SChristoph Hellwig } 14314cb5300bSChris Mason } 1432f46b5a66SChristoph Hellwig 1433dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14341e701a32SChris Mason filemap_flush(inode->i_mapping); 1435dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1436dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1437dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1438dec8ef90SFilipe Manana } 14391e701a32SChris Mason 14401e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14411e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14421e701a32SChris Mason * we have to make sure the IO is actually started and that 14431e701a32SChris Mason * ordered extents get created before we return 14441e701a32SChris Mason */ 14451e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14461e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14471e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14481e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14491e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14501e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14511e701a32SChris Mason } 14521e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14531e701a32SChris Mason } 14541e701a32SChris Mason 14551a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14562b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14571a419d85SLi Zefan } 14581a419d85SLi Zefan 145960ccf82fSDiego Calleja ret = defrag_count; 1460940100a4SChris Mason 14614cb5300bSChris Mason out_ra: 1462633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1463633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1464633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1465633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1466633085c7SFilipe David Borba Manana } 14674cb5300bSChris Mason if (!file) 14684cb5300bSChris Mason kfree(ra); 14694cb5300bSChris Mason kfree(pages); 1470940100a4SChris Mason return ret; 1471f46b5a66SChristoph Hellwig } 1472f46b5a66SChristoph Hellwig 1473198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 147476dda93cSYan, Zheng void __user *arg) 1475f46b5a66SChristoph Hellwig { 1476f46b5a66SChristoph Hellwig u64 new_size; 1477f46b5a66SChristoph Hellwig u64 old_size; 1478f46b5a66SChristoph Hellwig u64 devid = 1; 1479496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1480f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1481f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1482f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1483f46b5a66SChristoph Hellwig char *sizestr; 14849a40f122SGui Hecheng char *retptr; 1485f46b5a66SChristoph Hellwig char *devstr = NULL; 1486f46b5a66SChristoph Hellwig int ret = 0; 1487f46b5a66SChristoph Hellwig int mod = 0; 1488f46b5a66SChristoph Hellwig 1489e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1490e441d54dSChris Mason return -EPERM; 1491e441d54dSChris Mason 1492198605a8SMiao Xie ret = mnt_want_write_file(file); 1493198605a8SMiao Xie if (ret) 1494198605a8SMiao Xie return ret; 1495198605a8SMiao Xie 14965ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14975ac00addSStefan Behrens 1)) { 149897547676SMiao Xie mnt_drop_write_file(file); 1499e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1500c9e9f97bSIlya Dryomov } 1501c9e9f97bSIlya Dryomov 15025ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1503dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1504c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1505c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1506c9e9f97bSIlya Dryomov goto out; 1507c9e9f97bSIlya Dryomov } 15085516e595SMark Fasheh 15095516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1510f46b5a66SChristoph Hellwig 1511f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1512f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1513f46b5a66SChristoph Hellwig if (devstr) { 1514f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1515f46b5a66SChristoph Hellwig *devstr = '\0'; 1516f46b5a66SChristoph Hellwig devstr = vol_args->name; 151758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 151858dfae63SZhangZhen if (ret) 151958dfae63SZhangZhen goto out_free; 1520dfd79829SMiao Xie if (!devid) { 1521dfd79829SMiao Xie ret = -EINVAL; 1522dfd79829SMiao Xie goto out_free; 1523dfd79829SMiao Xie } 1524efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1525f46b5a66SChristoph Hellwig } 1526dba60f3fSMiao Xie 1527aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1528f46b5a66SChristoph Hellwig if (!device) { 1529efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1530c1c9ff7cSGeert Uytterhoeven devid); 1531dfd79829SMiao Xie ret = -ENODEV; 1532c9e9f97bSIlya Dryomov goto out_free; 1533f46b5a66SChristoph Hellwig } 1534dba60f3fSMiao Xie 1535dba60f3fSMiao Xie if (!device->writeable) { 1536efe120a0SFrank Holton btrfs_info(root->fs_info, 1537efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1538c1c9ff7cSGeert Uytterhoeven devid); 1539dfd79829SMiao Xie ret = -EPERM; 15404e42ae1bSLiu Bo goto out_free; 15414e42ae1bSLiu Bo } 15424e42ae1bSLiu Bo 1543f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1544f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1545f46b5a66SChristoph Hellwig else { 1546f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1547f46b5a66SChristoph Hellwig mod = -1; 1548f46b5a66SChristoph Hellwig sizestr++; 1549f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1550f46b5a66SChristoph Hellwig mod = 1; 1551f46b5a66SChristoph Hellwig sizestr++; 1552f46b5a66SChristoph Hellwig } 15539a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15549a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1555f46b5a66SChristoph Hellwig ret = -EINVAL; 1556c9e9f97bSIlya Dryomov goto out_free; 1557f46b5a66SChristoph Hellwig } 1558f46b5a66SChristoph Hellwig } 1559f46b5a66SChristoph Hellwig 156063a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1561dfd79829SMiao Xie ret = -EPERM; 156263a212abSStefan Behrens goto out_free; 156363a212abSStefan Behrens } 156463a212abSStefan Behrens 15657cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1566f46b5a66SChristoph Hellwig 1567f46b5a66SChristoph Hellwig if (mod < 0) { 1568f46b5a66SChristoph Hellwig if (new_size > old_size) { 1569f46b5a66SChristoph Hellwig ret = -EINVAL; 1570c9e9f97bSIlya Dryomov goto out_free; 1571f46b5a66SChristoph Hellwig } 1572f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1573f46b5a66SChristoph Hellwig } else if (mod > 0) { 1574eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1575902c68a4SGui Hecheng ret = -ERANGE; 1576eb8052e0SWenliang Fan goto out_free; 1577eb8052e0SWenliang Fan } 1578f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1579f46b5a66SChristoph Hellwig } 1580f46b5a66SChristoph Hellwig 1581f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1582f46b5a66SChristoph Hellwig ret = -EINVAL; 1583c9e9f97bSIlya Dryomov goto out_free; 1584f46b5a66SChristoph Hellwig } 1585f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1586f46b5a66SChristoph Hellwig ret = -EFBIG; 1587c9e9f97bSIlya Dryomov goto out_free; 1588f46b5a66SChristoph Hellwig } 1589f46b5a66SChristoph Hellwig 1590b8b93addSDavid Sterba new_size = div_u64(new_size, root->sectorsize); 1591f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1592f46b5a66SChristoph Hellwig 1593ecaeb14bSDavid Sterba btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", 1594c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1595f46b5a66SChristoph Hellwig 1596f46b5a66SChristoph Hellwig if (new_size > old_size) { 1597a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 159898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 159998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1600c9e9f97bSIlya Dryomov goto out_free; 160198d5dc13STsutomu Itoh } 1602f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1603f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1604ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1605f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 16060253f40eSjeff.liu } /* equal, nothing need to do */ 1607f46b5a66SChristoph Hellwig 1608c9e9f97bSIlya Dryomov out_free: 1609f46b5a66SChristoph Hellwig kfree(vol_args); 1610c9e9f97bSIlya Dryomov out: 1611c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16125ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 161318f39c41SIlya Dryomov mnt_drop_write_file(file); 1614f46b5a66SChristoph Hellwig return ret; 1615f46b5a66SChristoph Hellwig } 1616f46b5a66SChristoph Hellwig 161772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16186f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16196f72c7e2SArne Jansen u64 *transid, bool readonly, 16208696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1621f46b5a66SChristoph Hellwig { 1622f46b5a66SChristoph Hellwig int namelen; 16233de4586cSChris Mason int ret = 0; 1624f46b5a66SChristoph Hellwig 1625a874a63eSLiu Bo ret = mnt_want_write_file(file); 1626a874a63eSLiu Bo if (ret) 1627a874a63eSLiu Bo goto out; 1628a874a63eSLiu Bo 162972fd032eSSage Weil namelen = strlen(name); 163072fd032eSSage Weil if (strchr(name, '/')) { 1631f46b5a66SChristoph Hellwig ret = -EINVAL; 1632a874a63eSLiu Bo goto out_drop_write; 1633f46b5a66SChristoph Hellwig } 1634f46b5a66SChristoph Hellwig 163516780cabSChris Mason if (name[0] == '.' && 163616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 163716780cabSChris Mason ret = -EEXIST; 1638a874a63eSLiu Bo goto out_drop_write; 163916780cabSChris Mason } 164016780cabSChris Mason 16413de4586cSChris Mason if (subvol) { 164272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16436f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1644cb8e7090SChristoph Hellwig } else { 16452903ff01SAl Viro struct fd src = fdget(fd); 16463de4586cSChris Mason struct inode *src_inode; 16472903ff01SAl Viro if (!src.file) { 16483de4586cSChris Mason ret = -EINVAL; 1649a874a63eSLiu Bo goto out_drop_write; 16503de4586cSChris Mason } 16513de4586cSChris Mason 1652496ad9aaSAl Viro src_inode = file_inode(src.file); 1653496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1654efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1655efe120a0SFrank Holton "Snapshot src from another FS"); 165623ad5b17SKusanagi Kouichi ret = -EXDEV; 1657d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1658d0242061SDavid Sterba /* 1659d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1660d0242061SDavid Sterba * are limited to own subvolumes only 1661d0242061SDavid Sterba */ 1662d0242061SDavid Sterba ret = -EPERM; 1663ecd18815SAl Viro } else { 166472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 166572fd032eSSage Weil BTRFS_I(src_inode)->root, 16666f72c7e2SArne Jansen transid, readonly, inherit); 1667ecd18815SAl Viro } 16682903ff01SAl Viro fdput(src); 1669cb8e7090SChristoph Hellwig } 1670a874a63eSLiu Bo out_drop_write: 1671a874a63eSLiu Bo mnt_drop_write_file(file); 1672f46b5a66SChristoph Hellwig out: 167372fd032eSSage Weil return ret; 167472fd032eSSage Weil } 167572fd032eSSage Weil 167672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1677fa0d2b9bSLi Zefan void __user *arg, int subvol) 167872fd032eSSage Weil { 1679fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 168072fd032eSSage Weil int ret; 168172fd032eSSage Weil 1682fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1683fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1684fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1685fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1686fa0d2b9bSLi Zefan 1687fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1688b83cc969SLi Zefan vol_args->fd, subvol, 16896f72c7e2SArne Jansen NULL, false, NULL); 1690fa0d2b9bSLi Zefan 1691fa0d2b9bSLi Zefan kfree(vol_args); 1692fa0d2b9bSLi Zefan return ret; 1693fa0d2b9bSLi Zefan } 1694fa0d2b9bSLi Zefan 1695fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1696fa0d2b9bSLi Zefan void __user *arg, int subvol) 1697fa0d2b9bSLi Zefan { 1698fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1699fa0d2b9bSLi Zefan int ret; 1700fdfb1e4fSLi Zefan u64 transid = 0; 1701fdfb1e4fSLi Zefan u64 *ptr = NULL; 1702b83cc969SLi Zefan bool readonly = false; 17036f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 170472fd032eSSage Weil 1705fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1706fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1707fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1708fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1709fdfb1e4fSLi Zefan 1710b83cc969SLi Zefan if (vol_args->flags & 17116f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17126f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1713b83cc969SLi Zefan ret = -EOPNOTSUPP; 1714c47ca32dSDan Carpenter goto free_args; 1715fdfb1e4fSLi Zefan } 1716fdfb1e4fSLi Zefan 1717fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1718fdfb1e4fSLi Zefan ptr = &transid; 1719b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1720b83cc969SLi Zefan readonly = true; 17216f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17226f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17236f72c7e2SArne Jansen ret = -EINVAL; 1724c47ca32dSDan Carpenter goto free_args; 17256f72c7e2SArne Jansen } 17266f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17276f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17286f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1729c47ca32dSDan Carpenter goto free_args; 17306f72c7e2SArne Jansen } 17316f72c7e2SArne Jansen } 173275eaa0e2SSage Weil 1733fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17346f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17358696c533SMiao Xie readonly, inherit); 1736c47ca32dSDan Carpenter if (ret) 1737c47ca32dSDan Carpenter goto free_inherit; 173875eaa0e2SSage Weil 1739c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1740fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1741c47ca32dSDan Carpenter transid), 1742c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 174375eaa0e2SSage Weil ret = -EFAULT; 1744c47ca32dSDan Carpenter 1745c47ca32dSDan Carpenter free_inherit: 17466f72c7e2SArne Jansen kfree(inherit); 1747c47ca32dSDan Carpenter free_args: 1748c47ca32dSDan Carpenter kfree(vol_args); 1749f46b5a66SChristoph Hellwig return ret; 1750f46b5a66SChristoph Hellwig } 1751f46b5a66SChristoph Hellwig 17520caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17530caa102dSLi Zefan void __user *arg) 17540caa102dSLi Zefan { 1755496ad9aaSAl Viro struct inode *inode = file_inode(file); 17560caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17570caa102dSLi Zefan int ret = 0; 17580caa102dSLi Zefan u64 flags = 0; 17590caa102dSLi Zefan 176033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17610caa102dSLi Zefan return -EINVAL; 17620caa102dSLi Zefan 17630caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17640caa102dSLi Zefan if (btrfs_root_readonly(root)) 17650caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17660caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17670caa102dSLi Zefan 17680caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17690caa102dSLi Zefan ret = -EFAULT; 17700caa102dSLi Zefan 17710caa102dSLi Zefan return ret; 17720caa102dSLi Zefan } 17730caa102dSLi Zefan 17740caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17750caa102dSLi Zefan void __user *arg) 17760caa102dSLi Zefan { 1777496ad9aaSAl Viro struct inode *inode = file_inode(file); 17780caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17790caa102dSLi Zefan struct btrfs_trans_handle *trans; 17800caa102dSLi Zefan u64 root_flags; 17810caa102dSLi Zefan u64 flags; 17820caa102dSLi Zefan int ret = 0; 17830caa102dSLi Zefan 1784bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1785bd60ea0fSDavid Sterba return -EPERM; 1786bd60ea0fSDavid Sterba 1787b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1788b9ca0664SLiu Bo if (ret) 1789b9ca0664SLiu Bo goto out; 17900caa102dSLi Zefan 1791b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1792b9ca0664SLiu Bo ret = -EINVAL; 1793b9ca0664SLiu Bo goto out_drop_write; 1794b9ca0664SLiu Bo } 17950caa102dSLi Zefan 1796b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1797b9ca0664SLiu Bo ret = -EFAULT; 1798b9ca0664SLiu Bo goto out_drop_write; 1799b9ca0664SLiu Bo } 18000caa102dSLi Zefan 1801b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1802b9ca0664SLiu Bo ret = -EINVAL; 1803b9ca0664SLiu Bo goto out_drop_write; 1804b9ca0664SLiu Bo } 18050caa102dSLi Zefan 1806b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1807b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1808b9ca0664SLiu Bo goto out_drop_write; 1809b9ca0664SLiu Bo } 18100caa102dSLi Zefan 18110caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 18120caa102dSLi Zefan 18130caa102dSLi Zefan /* nothing to do */ 18140caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1815b9ca0664SLiu Bo goto out_drop_sem; 18160caa102dSLi Zefan 18170caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18182c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18190caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18200caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18212c686537SDavid Sterba } else { 18222c686537SDavid Sterba /* 18232c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18242c686537SDavid Sterba * send 18252c686537SDavid Sterba */ 18262c686537SDavid Sterba spin_lock(&root->root_item_lock); 18272c686537SDavid Sterba if (root->send_in_progress == 0) { 18280caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18290caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18302c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18312c686537SDavid Sterba } else { 18322c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18332c686537SDavid Sterba btrfs_warn(root->fs_info, 18342c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18352c686537SDavid Sterba root->root_key.objectid); 18362c686537SDavid Sterba ret = -EPERM; 18372c686537SDavid Sterba goto out_drop_sem; 18382c686537SDavid Sterba } 18392c686537SDavid Sterba } 18400caa102dSLi Zefan 18410caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18420caa102dSLi Zefan if (IS_ERR(trans)) { 18430caa102dSLi Zefan ret = PTR_ERR(trans); 18440caa102dSLi Zefan goto out_reset; 18450caa102dSLi Zefan } 18460caa102dSLi Zefan 1847b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18480caa102dSLi Zefan &root->root_key, &root->root_item); 18490caa102dSLi Zefan 18500caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18510caa102dSLi Zefan out_reset: 18520caa102dSLi Zefan if (ret) 18530caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1854b9ca0664SLiu Bo out_drop_sem: 18550caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1856b9ca0664SLiu Bo out_drop_write: 1857b9ca0664SLiu Bo mnt_drop_write_file(file); 1858b9ca0664SLiu Bo out: 18590caa102dSLi Zefan return ret; 18600caa102dSLi Zefan } 18610caa102dSLi Zefan 186276dda93cSYan, Zheng /* 186376dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 186476dda93cSYan, Zheng */ 186576dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 186676dda93cSYan, Zheng { 186776dda93cSYan, Zheng struct btrfs_path *path; 1868175a2b87SJosef Bacik struct btrfs_dir_item *di; 186976dda93cSYan, Zheng struct btrfs_key key; 1870175a2b87SJosef Bacik u64 dir_id; 187176dda93cSYan, Zheng int ret; 187276dda93cSYan, Zheng 187376dda93cSYan, Zheng path = btrfs_alloc_path(); 187476dda93cSYan, Zheng if (!path) 187576dda93cSYan, Zheng return -ENOMEM; 187676dda93cSYan, Zheng 1877175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1878175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1879175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1880175a2b87SJosef Bacik dir_id, "default", 7, 0); 1881175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1882175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1883175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 188472de6b53SGuangyu Sun ret = -EPERM; 188572de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 188672de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1887175a2b87SJosef Bacik goto out; 1888175a2b87SJosef Bacik } 1889175a2b87SJosef Bacik btrfs_release_path(path); 1890175a2b87SJosef Bacik } 1891175a2b87SJosef Bacik 189276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 189376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 189476dda93cSYan, Zheng key.offset = (u64)-1; 189576dda93cSYan, Zheng 189676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 189776dda93cSYan, Zheng &key, path, 0, 0); 189876dda93cSYan, Zheng if (ret < 0) 189976dda93cSYan, Zheng goto out; 190076dda93cSYan, Zheng BUG_ON(ret == 0); 190176dda93cSYan, Zheng 190276dda93cSYan, Zheng ret = 0; 190376dda93cSYan, Zheng if (path->slots[0] > 0) { 190476dda93cSYan, Zheng path->slots[0]--; 190576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 190676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 190776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 190876dda93cSYan, Zheng ret = -ENOTEMPTY; 190976dda93cSYan, Zheng } 191076dda93cSYan, Zheng out: 191176dda93cSYan, Zheng btrfs_free_path(path); 191276dda93cSYan, Zheng return ret; 191376dda93cSYan, Zheng } 191476dda93cSYan, Zheng 1915ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1916ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1917ac8e9819SChris Mason { 1918abc6e134SChris Mason struct btrfs_key test; 1919abc6e134SChris Mason int ret; 1920abc6e134SChris Mason 1921abc6e134SChris Mason test.objectid = sk->min_objectid; 1922abc6e134SChris Mason test.type = sk->min_type; 1923abc6e134SChris Mason test.offset = sk->min_offset; 1924abc6e134SChris Mason 1925abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1926abc6e134SChris Mason if (ret < 0) 1927ac8e9819SChris Mason return 0; 1928abc6e134SChris Mason 1929abc6e134SChris Mason test.objectid = sk->max_objectid; 1930abc6e134SChris Mason test.type = sk->max_type; 1931abc6e134SChris Mason test.offset = sk->max_offset; 1932abc6e134SChris Mason 1933abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1934abc6e134SChris Mason if (ret > 0) 1935ac8e9819SChris Mason return 0; 1936ac8e9819SChris Mason return 1; 1937ac8e9819SChris Mason } 1938ac8e9819SChris Mason 1939ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1940ac8e9819SChris Mason struct btrfs_path *path, 1941ac8e9819SChris Mason struct btrfs_key *key, 1942ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19439b6e817dSGerhard Heift size_t *buf_size, 1944ba346b35SGerhard Heift char __user *ubuf, 1945ac8e9819SChris Mason unsigned long *sk_offset, 1946ac8e9819SChris Mason int *num_found) 1947ac8e9819SChris Mason { 1948ac8e9819SChris Mason u64 found_transid; 1949ac8e9819SChris Mason struct extent_buffer *leaf; 1950ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1951dd81d459SNaohiro Aota struct btrfs_key test; 1952ac8e9819SChris Mason unsigned long item_off; 1953ac8e9819SChris Mason unsigned long item_len; 1954ac8e9819SChris Mason int nritems; 1955ac8e9819SChris Mason int i; 1956ac8e9819SChris Mason int slot; 1957ac8e9819SChris Mason int ret = 0; 1958ac8e9819SChris Mason 1959ac8e9819SChris Mason leaf = path->nodes[0]; 1960ac8e9819SChris Mason slot = path->slots[0]; 1961ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1962ac8e9819SChris Mason 1963ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1964ac8e9819SChris Mason i = nritems; 1965ac8e9819SChris Mason goto advance_key; 1966ac8e9819SChris Mason } 1967ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1968ac8e9819SChris Mason 1969ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1970ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1971ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1972ac8e9819SChris Mason 197303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 197403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 197503b71c6cSGabriel de Perthuis continue; 197603b71c6cSGabriel de Perthuis 19779b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19788f5f6178SGerhard Heift if (*num_found) { 1979ac8e9819SChris Mason ret = 1; 19808f5f6178SGerhard Heift goto out; 19818f5f6178SGerhard Heift } 19828f5f6178SGerhard Heift 19838f5f6178SGerhard Heift /* 19848f5f6178SGerhard Heift * return one empty item back for v1, which does not 19858f5f6178SGerhard Heift * handle -EOVERFLOW 19868f5f6178SGerhard Heift */ 19878f5f6178SGerhard Heift 19889b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1989ac8e9819SChris Mason item_len = 0; 19908f5f6178SGerhard Heift ret = -EOVERFLOW; 19918f5f6178SGerhard Heift } 1992ac8e9819SChris Mason 19939b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1994ac8e9819SChris Mason ret = 1; 199525c9bc2eSGerhard Heift goto out; 1996ac8e9819SChris Mason } 1997ac8e9819SChris Mason 1998ac8e9819SChris Mason sh.objectid = key->objectid; 1999ac8e9819SChris Mason sh.offset = key->offset; 2000ac8e9819SChris Mason sh.type = key->type; 2001ac8e9819SChris Mason sh.len = item_len; 2002ac8e9819SChris Mason sh.transid = found_transid; 2003ac8e9819SChris Mason 2004ac8e9819SChris Mason /* copy search result header */ 2005ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2006ba346b35SGerhard Heift ret = -EFAULT; 2007ba346b35SGerhard Heift goto out; 2008ba346b35SGerhard Heift } 2009ba346b35SGerhard Heift 2010ac8e9819SChris Mason *sk_offset += sizeof(sh); 2011ac8e9819SChris Mason 2012ac8e9819SChris Mason if (item_len) { 2013ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2014ac8e9819SChris Mason /* copy the item */ 2015ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2016ba346b35SGerhard Heift item_off, item_len)) { 2017ba346b35SGerhard Heift ret = -EFAULT; 2018ba346b35SGerhard Heift goto out; 2019ba346b35SGerhard Heift } 2020ba346b35SGerhard Heift 2021ac8e9819SChris Mason *sk_offset += item_len; 2022ac8e9819SChris Mason } 2023e2156867SHugo Mills (*num_found)++; 2024ac8e9819SChris Mason 20258f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20268f5f6178SGerhard Heift goto out; 20278f5f6178SGerhard Heift 202825c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 202925c9bc2eSGerhard Heift ret = 1; 203025c9bc2eSGerhard Heift goto out; 203125c9bc2eSGerhard Heift } 2032ac8e9819SChris Mason } 2033ac8e9819SChris Mason advance_key: 2034ac8e9819SChris Mason ret = 0; 2035dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2036dd81d459SNaohiro Aota test.type = sk->max_type; 2037dd81d459SNaohiro Aota test.offset = sk->max_offset; 2038dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2039dd81d459SNaohiro Aota ret = 1; 2040dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2041abc6e134SChris Mason key->offset++; 2042dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2043abc6e134SChris Mason key->offset = 0; 2044abc6e134SChris Mason key->type++; 2045dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2046abc6e134SChris Mason key->offset = 0; 2047abc6e134SChris Mason key->type = 0; 2048abc6e134SChris Mason key->objectid++; 2049abc6e134SChris Mason } else 2050abc6e134SChris Mason ret = 1; 205125c9bc2eSGerhard Heift out: 2052ba346b35SGerhard Heift /* 2053ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2054ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2055ba346b35SGerhard Heift * * all items were found 2056ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2057ba346b35SGerhard Heift * leaf 2058ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2059ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2060ba346b35SGerhard Heift */ 2061ac8e9819SChris Mason return ret; 2062ac8e9819SChris Mason } 2063ac8e9819SChris Mason 2064ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 206512544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20669b6e817dSGerhard Heift size_t *buf_size, 2067ba346b35SGerhard Heift char __user *ubuf) 2068ac8e9819SChris Mason { 2069ac8e9819SChris Mason struct btrfs_root *root; 2070ac8e9819SChris Mason struct btrfs_key key; 2071ac8e9819SChris Mason struct btrfs_path *path; 2072ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2073ac8e9819SChris Mason int ret; 2074ac8e9819SChris Mason int num_found = 0; 2075ac8e9819SChris Mason unsigned long sk_offset = 0; 2076ac8e9819SChris Mason 20779b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20789b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 207912544442SGerhard Heift return -EOVERFLOW; 20809b6e817dSGerhard Heift } 208112544442SGerhard Heift 2082ac8e9819SChris Mason path = btrfs_alloc_path(); 2083ac8e9819SChris Mason if (!path) 2084ac8e9819SChris Mason return -ENOMEM; 2085ac8e9819SChris Mason 2086ac8e9819SChris Mason if (sk->tree_id == 0) { 2087ac8e9819SChris Mason /* search the root of the inode that was passed */ 2088ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2089ac8e9819SChris Mason } else { 2090ac8e9819SChris Mason key.objectid = sk->tree_id; 2091ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2092ac8e9819SChris Mason key.offset = (u64)-1; 2093ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2094ac8e9819SChris Mason if (IS_ERR(root)) { 2095f14d104dSDavid Sterba btrfs_err(info, "could not find root %llu", 2096ac8e9819SChris Mason sk->tree_id); 2097ac8e9819SChris Mason btrfs_free_path(path); 2098ac8e9819SChris Mason return -ENOENT; 2099ac8e9819SChris Mason } 2100ac8e9819SChris Mason } 2101ac8e9819SChris Mason 2102ac8e9819SChris Mason key.objectid = sk->min_objectid; 2103ac8e9819SChris Mason key.type = sk->min_type; 2104ac8e9819SChris Mason key.offset = sk->min_offset; 2105ac8e9819SChris Mason 2106ac8e9819SChris Mason while (1) { 21076174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2108ac8e9819SChris Mason if (ret != 0) { 2109ac8e9819SChris Mason if (ret > 0) 2110ac8e9819SChris Mason ret = 0; 2111ac8e9819SChris Mason goto err; 2112ac8e9819SChris Mason } 2113ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2114ac8e9819SChris Mason &sk_offset, &num_found); 2115b3b4aa74SDavid Sterba btrfs_release_path(path); 211625c9bc2eSGerhard Heift if (ret) 2117ac8e9819SChris Mason break; 2118ac8e9819SChris Mason 2119ac8e9819SChris Mason } 21208f5f6178SGerhard Heift if (ret > 0) 2121ac8e9819SChris Mason ret = 0; 2122ac8e9819SChris Mason err: 2123ac8e9819SChris Mason sk->nr_items = num_found; 2124ac8e9819SChris Mason btrfs_free_path(path); 2125ac8e9819SChris Mason return ret; 2126ac8e9819SChris Mason } 2127ac8e9819SChris Mason 2128ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2129ac8e9819SChris Mason void __user *argp) 2130ac8e9819SChris Mason { 2131ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2132ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2133ac8e9819SChris Mason struct inode *inode; 2134ac8e9819SChris Mason int ret; 21359b6e817dSGerhard Heift size_t buf_size; 2136ac8e9819SChris Mason 2137ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2138ac8e9819SChris Mason return -EPERM; 2139ac8e9819SChris Mason 2140ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2141ac8e9819SChris Mason 2142ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2143ba346b35SGerhard Heift return -EFAULT; 2144ba346b35SGerhard Heift 2145ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2146ac8e9819SChris Mason 2147496ad9aaSAl Viro inode = file_inode(file); 2148ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21498f5f6178SGerhard Heift 21508f5f6178SGerhard Heift /* 21518f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21528f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21538f5f6178SGerhard Heift */ 21548f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21558f5f6178SGerhard Heift ret = 0; 21568f5f6178SGerhard Heift 2157ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2158ac8e9819SChris Mason ret = -EFAULT; 2159ac8e9819SChris Mason return ret; 2160ac8e9819SChris Mason } 2161ac8e9819SChris Mason 2162cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2163cc68a8a5SGerhard Heift void __user *argp) 2164cc68a8a5SGerhard Heift { 2165cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2166cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2167cc68a8a5SGerhard Heift struct inode *inode; 2168cc68a8a5SGerhard Heift int ret; 2169cc68a8a5SGerhard Heift size_t buf_size; 2170cc68a8a5SGerhard Heift const size_t buf_limit = 16 * 1024 * 1024; 2171cc68a8a5SGerhard Heift 2172cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2173cc68a8a5SGerhard Heift return -EPERM; 2174cc68a8a5SGerhard Heift 2175cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2176cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2177cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2178cc68a8a5SGerhard Heift return -EFAULT; 2179cc68a8a5SGerhard Heift 2180cc68a8a5SGerhard Heift buf_size = args.buf_size; 2181cc68a8a5SGerhard Heift 2182cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2183cc68a8a5SGerhard Heift return -EOVERFLOW; 2184cc68a8a5SGerhard Heift 2185cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2186cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2187cc68a8a5SGerhard Heift buf_size = buf_limit; 2188cc68a8a5SGerhard Heift 2189cc68a8a5SGerhard Heift inode = file_inode(file); 2190cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2191cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2192cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2193cc68a8a5SGerhard Heift ret = -EFAULT; 2194cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2195cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2196cc68a8a5SGerhard Heift ret = -EFAULT; 2197cc68a8a5SGerhard Heift 219876dda93cSYan, Zheng return ret; 219976dda93cSYan, Zheng } 220076dda93cSYan, Zheng 220198d377a0STARUISI Hiroaki /* 2202ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2203ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 220498d377a0STARUISI Hiroaki */ 220598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 220698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 220798d377a0STARUISI Hiroaki { 220898d377a0STARUISI Hiroaki struct btrfs_root *root; 220998d377a0STARUISI Hiroaki struct btrfs_key key; 2210ac8e9819SChris Mason char *ptr; 221198d377a0STARUISI Hiroaki int ret = -1; 221298d377a0STARUISI Hiroaki int slot; 221398d377a0STARUISI Hiroaki int len; 221498d377a0STARUISI Hiroaki int total_len = 0; 221598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 221698d377a0STARUISI Hiroaki struct extent_buffer *l; 221798d377a0STARUISI Hiroaki struct btrfs_path *path; 221898d377a0STARUISI Hiroaki 221998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 222098d377a0STARUISI Hiroaki name[0]='\0'; 222198d377a0STARUISI Hiroaki return 0; 222298d377a0STARUISI Hiroaki } 222398d377a0STARUISI Hiroaki 222498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 222598d377a0STARUISI Hiroaki if (!path) 222698d377a0STARUISI Hiroaki return -ENOMEM; 222798d377a0STARUISI Hiroaki 2228ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 222998d377a0STARUISI Hiroaki 223098d377a0STARUISI Hiroaki key.objectid = tree_id; 223198d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 223298d377a0STARUISI Hiroaki key.offset = (u64)-1; 223398d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 223498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2235f14d104dSDavid Sterba btrfs_err(info, "could not find root %llu", tree_id); 22368ad6fcabSChris Mason ret = -ENOENT; 22378ad6fcabSChris Mason goto out; 223898d377a0STARUISI Hiroaki } 223998d377a0STARUISI Hiroaki 224098d377a0STARUISI Hiroaki key.objectid = dirid; 224198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22428ad6fcabSChris Mason key.offset = (u64)-1; 224398d377a0STARUISI Hiroaki 224498d377a0STARUISI Hiroaki while (1) { 224598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 224698d377a0STARUISI Hiroaki if (ret < 0) 224798d377a0STARUISI Hiroaki goto out; 224818674c6cSFilipe David Borba Manana else if (ret > 0) { 224918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 225018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 225118674c6cSFilipe David Borba Manana if (ret < 0) 225218674c6cSFilipe David Borba Manana goto out; 225318674c6cSFilipe David Borba Manana else if (ret > 0) { 2254ac8e9819SChris Mason ret = -ENOENT; 225598d377a0STARUISI Hiroaki goto out; 2256ac8e9819SChris Mason } 225718674c6cSFilipe David Borba Manana } 225818674c6cSFilipe David Borba Manana 225918674c6cSFilipe David Borba Manana l = path->nodes[0]; 226018674c6cSFilipe David Borba Manana slot = path->slots[0]; 226118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 226298d377a0STARUISI Hiroaki 226398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 226498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 226598d377a0STARUISI Hiroaki ptr -= len + 1; 226698d377a0STARUISI Hiroaki total_len += len + 1; 2267a696cf35SFilipe David Borba Manana if (ptr < name) { 2268a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 226998d377a0STARUISI Hiroaki goto out; 2270a696cf35SFilipe David Borba Manana } 227198d377a0STARUISI Hiroaki 227298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 227398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 227498d377a0STARUISI Hiroaki 227598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 227698d377a0STARUISI Hiroaki break; 227798d377a0STARUISI Hiroaki 2278b3b4aa74SDavid Sterba btrfs_release_path(path); 227998d377a0STARUISI Hiroaki key.objectid = key.offset; 22808ad6fcabSChris Mason key.offset = (u64)-1; 228198d377a0STARUISI Hiroaki dirid = key.objectid; 228298d377a0STARUISI Hiroaki } 228377906a50SLi Zefan memmove(name, ptr, total_len); 228498d377a0STARUISI Hiroaki name[total_len] = '\0'; 228598d377a0STARUISI Hiroaki ret = 0; 228698d377a0STARUISI Hiroaki out: 228798d377a0STARUISI Hiroaki btrfs_free_path(path); 2288ac8e9819SChris Mason return ret; 2289ac8e9819SChris Mason } 2290ac8e9819SChris Mason 2291ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2292ac8e9819SChris Mason void __user *argp) 2293ac8e9819SChris Mason { 2294ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2295ac8e9819SChris Mason struct inode *inode; 229601b810b8SDavid Sterba int ret = 0; 2297ac8e9819SChris Mason 22982354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 22992354d08fSJulia Lawall if (IS_ERR(args)) 23002354d08fSJulia Lawall return PTR_ERR(args); 2301c2b96929SDan Carpenter 2302496ad9aaSAl Viro inode = file_inode(file); 2303ac8e9819SChris Mason 230401b810b8SDavid Sterba /* 230501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 230601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 230701b810b8SDavid Sterba */ 23081b53ac4dSChris Mason if (args->treeid == 0) 23091b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 23101b53ac4dSChris Mason 231101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 231201b810b8SDavid Sterba args->name[0] = 0; 231301b810b8SDavid Sterba goto out; 231401b810b8SDavid Sterba } 231501b810b8SDavid Sterba 231601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 231701b810b8SDavid Sterba ret = -EPERM; 231801b810b8SDavid Sterba goto out; 231901b810b8SDavid Sterba } 232001b810b8SDavid Sterba 2321ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2322ac8e9819SChris Mason args->treeid, args->objectid, 2323ac8e9819SChris Mason args->name); 2324ac8e9819SChris Mason 232501b810b8SDavid Sterba out: 2326ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2327ac8e9819SChris Mason ret = -EFAULT; 2328ac8e9819SChris Mason 2329ac8e9819SChris Mason kfree(args); 233098d377a0STARUISI Hiroaki return ret; 233198d377a0STARUISI Hiroaki } 233298d377a0STARUISI Hiroaki 233376dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 233476dda93cSYan, Zheng void __user *arg) 233576dda93cSYan, Zheng { 233654563d41SAl Viro struct dentry *parent = file->f_path.dentry; 233776dda93cSYan, Zheng struct dentry *dentry; 23382b0143b5SDavid Howells struct inode *dir = d_inode(parent); 233976dda93cSYan, Zheng struct inode *inode; 234076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 234176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 234276dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 234376dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2344c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2345521e0546SDavid Sterba u64 root_flags; 2346c58aaad2SMiao Xie u64 qgroup_reserved; 234776dda93cSYan, Zheng int namelen; 234876dda93cSYan, Zheng int ret; 234976dda93cSYan, Zheng int err = 0; 235076dda93cSYan, Zheng 235176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 235276dda93cSYan, Zheng if (IS_ERR(vol_args)) 235376dda93cSYan, Zheng return PTR_ERR(vol_args); 235476dda93cSYan, Zheng 235576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 235676dda93cSYan, Zheng namelen = strlen(vol_args->name); 235776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 235876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 235976dda93cSYan, Zheng err = -EINVAL; 236076dda93cSYan, Zheng goto out; 236176dda93cSYan, Zheng } 236276dda93cSYan, Zheng 2363a561be71SAl Viro err = mnt_want_write_file(file); 236476dda93cSYan, Zheng if (err) 236576dda93cSYan, Zheng goto out; 236676dda93cSYan, Zheng 2367521e0546SDavid Sterba 23685c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23695c50c9b8SDavid Sterba if (err == -EINTR) 2370e43f998eSDavid Sterba goto out_drop_write; 237176dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 237276dda93cSYan, Zheng if (IS_ERR(dentry)) { 237376dda93cSYan, Zheng err = PTR_ERR(dentry); 237476dda93cSYan, Zheng goto out_unlock_dir; 237576dda93cSYan, Zheng } 237676dda93cSYan, Zheng 23772b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 237876dda93cSYan, Zheng err = -ENOENT; 237976dda93cSYan, Zheng goto out_dput; 238076dda93cSYan, Zheng } 238176dda93cSYan, Zheng 23822b0143b5SDavid Howells inode = d_inode(dentry); 23834260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23844260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23854260f7c7SSage Weil /* 23864260f7c7SSage Weil * Regular user. Only allow this with a special mount 23874260f7c7SSage Weil * option, when the user has write+exec access to the 23884260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23894260f7c7SSage Weil * allowed. 23904260f7c7SSage Weil * 23914260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23924260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23934260f7c7SSage Weil * otherwise be able to delete. 23944260f7c7SSage Weil * 23954260f7c7SSage Weil * Users who want to delete empty subvols should try 23964260f7c7SSage Weil * rmdir(2). 23974260f7c7SSage Weil */ 23984260f7c7SSage Weil err = -EPERM; 23994260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 24004260f7c7SSage Weil goto out_dput; 24014260f7c7SSage Weil 24024260f7c7SSage Weil /* 24034260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 24044260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 24054260f7c7SSage Weil * must be called on the dentry referencing the root 24064260f7c7SSage Weil * of the subvol, not a random directory contained 24074260f7c7SSage Weil * within it. 24084260f7c7SSage Weil */ 24094260f7c7SSage Weil err = -EINVAL; 24104260f7c7SSage Weil if (root == dest) 24114260f7c7SSage Weil goto out_dput; 24124260f7c7SSage Weil 24134260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 24144260f7c7SSage Weil if (err) 24154260f7c7SSage Weil goto out_dput; 24165c39da5bSMiao Xie } 24174260f7c7SSage Weil 24185c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 24194260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 24204260f7c7SSage Weil if (err) 24214260f7c7SSage Weil goto out_dput; 24224260f7c7SSage Weil 242333345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 242476dda93cSYan, Zheng err = -EINVAL; 242576dda93cSYan, Zheng goto out_dput; 242676dda93cSYan, Zheng } 242776dda93cSYan, Zheng 242876dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 2429521e0546SDavid Sterba 2430521e0546SDavid Sterba /* 2431521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2432521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2433521e0546SDavid Sterba * again is not run concurrently. 2434521e0546SDavid Sterba */ 2435521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2436c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2437c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2438c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2439521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2440521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2441521e0546SDavid Sterba } else { 2442521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2443521e0546SDavid Sterba btrfs_warn(root->fs_info, 2444521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2445c55bfa67SFilipe Manana dest->root_key.objectid); 2446521e0546SDavid Sterba err = -EPERM; 2447909e26dcSOmar Sandoval goto out_unlock_inode; 2448521e0546SDavid Sterba } 2449521e0546SDavid Sterba 245076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 245176dda93cSYan, Zheng 245276dda93cSYan, Zheng err = may_destroy_subvol(dest); 245376dda93cSYan, Zheng if (err) 245476dda93cSYan, Zheng goto out_up_write; 245576dda93cSYan, Zheng 2456c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2457c58aaad2SMiao Xie /* 2458c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2459c58aaad2SMiao Xie * ref/backref. 2460c58aaad2SMiao Xie */ 2461c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2462ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2463c58aaad2SMiao Xie if (err) 2464c58aaad2SMiao Xie goto out_up_write; 2465c58aaad2SMiao Xie 2466a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2467a22285a6SYan, Zheng if (IS_ERR(trans)) { 2468a22285a6SYan, Zheng err = PTR_ERR(trans); 2469c58aaad2SMiao Xie goto out_release; 2470a22285a6SYan, Zheng } 2471c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2472c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2473a22285a6SYan, Zheng 247476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 247576dda93cSYan, Zheng dest->root_key.objectid, 247676dda93cSYan, Zheng dentry->d_name.name, 247776dda93cSYan, Zheng dentry->d_name.len); 247879787eaaSJeff Mahoney if (ret) { 247979787eaaSJeff Mahoney err = ret; 248079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 248179787eaaSJeff Mahoney goto out_end_trans; 248279787eaaSJeff Mahoney } 248376dda93cSYan, Zheng 248476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 248576dda93cSYan, Zheng 248676dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 248776dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 248876dda93cSYan, Zheng dest->root_item.drop_level = 0; 248976dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 249076dda93cSYan, Zheng 249127cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 249276dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 249376dda93cSYan, Zheng root->fs_info->tree_root, 249476dda93cSYan, Zheng dest->root_key.objectid); 249579787eaaSJeff Mahoney if (ret) { 249679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 249779787eaaSJeff Mahoney err = ret; 249879787eaaSJeff Mahoney goto out_end_trans; 2499d68fc57bSYan, Zheng } 250079787eaaSJeff Mahoney } 2501dd5f9615SStefan Behrens 2502dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2503dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2504dd5f9615SStefan Behrens dest->root_key.objectid); 2505dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2506dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2507dd5f9615SStefan Behrens err = ret; 2508dd5f9615SStefan Behrens goto out_end_trans; 2509dd5f9615SStefan Behrens } 2510dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2511dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2512dd5f9615SStefan Behrens dest->root_item.received_uuid, 2513dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2514dd5f9615SStefan Behrens dest->root_key.objectid); 2515dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2516dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2517dd5f9615SStefan Behrens err = ret; 2518dd5f9615SStefan Behrens goto out_end_trans; 2519dd5f9615SStefan Behrens } 2520dd5f9615SStefan Behrens } 2521dd5f9615SStefan Behrens 252279787eaaSJeff Mahoney out_end_trans: 2523c58aaad2SMiao Xie trans->block_rsv = NULL; 2524c58aaad2SMiao Xie trans->bytes_reserved = 0; 2525531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 252679787eaaSJeff Mahoney if (ret && !err) 252779787eaaSJeff Mahoney err = ret; 252876dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2529c58aaad2SMiao Xie out_release: 2530c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 253176dda93cSYan, Zheng out_up_write: 253276dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 2533521e0546SDavid Sterba if (err) { 2534521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2535c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2536c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2537521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2538521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2539521e0546SDavid Sterba } 2540909e26dcSOmar Sandoval out_unlock_inode: 254176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 254276dda93cSYan, Zheng if (!err) { 254364ad6c48SOmar Sandoval d_invalidate(dentry); 254476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 254576dda93cSYan, Zheng d_delete(dentry); 254661155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2547fa6ac876SLiu Bo 2548fa6ac876SLiu Bo /* the last ref */ 254957cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 255057cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 255157cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2552fa6ac876SLiu Bo } 255376dda93cSYan, Zheng } 255476dda93cSYan, Zheng out_dput: 255576dda93cSYan, Zheng dput(dentry); 255676dda93cSYan, Zheng out_unlock_dir: 255776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2558e43f998eSDavid Sterba out_drop_write: 25592a79f17eSAl Viro mnt_drop_write_file(file); 256076dda93cSYan, Zheng out: 256176dda93cSYan, Zheng kfree(vol_args); 256276dda93cSYan, Zheng return err; 256376dda93cSYan, Zheng } 256476dda93cSYan, Zheng 25651e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2566f46b5a66SChristoph Hellwig { 2567496ad9aaSAl Viro struct inode *inode = file_inode(file); 2568f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25691e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2570c146afadSYan Zheng int ret; 2571c146afadSYan Zheng 257225122d15SIlya Dryomov ret = mnt_want_write_file(file); 257325122d15SIlya Dryomov if (ret) 257425122d15SIlya Dryomov return ret; 2575b83cc969SLi Zefan 257625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 257725122d15SIlya Dryomov ret = -EROFS; 257825122d15SIlya Dryomov goto out; 25795ac00addSStefan Behrens } 2580f46b5a66SChristoph Hellwig 2581f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2582f46b5a66SChristoph Hellwig case S_IFDIR: 2583e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2584e441d54dSChris Mason ret = -EPERM; 2585e441d54dSChris Mason goto out; 2586e441d54dSChris Mason } 2587de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25888929ecfaSYan, Zheng if (ret) 25898929ecfaSYan, Zheng goto out; 2590de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2591f46b5a66SChristoph Hellwig break; 2592f46b5a66SChristoph Hellwig case S_IFREG: 2593e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2594e441d54dSChris Mason ret = -EINVAL; 2595e441d54dSChris Mason goto out; 2596e441d54dSChris Mason } 25971e701a32SChris Mason 25981e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 25991e701a32SChris Mason if (!range) { 26001e701a32SChris Mason ret = -ENOMEM; 26011e701a32SChris Mason goto out; 26021e701a32SChris Mason } 26031e701a32SChris Mason 26041e701a32SChris Mason if (argp) { 26051e701a32SChris Mason if (copy_from_user(range, argp, 26061e701a32SChris Mason sizeof(*range))) { 26071e701a32SChris Mason ret = -EFAULT; 26081e701a32SChris Mason kfree(range); 2609683be16eSDan Carpenter goto out; 26101e701a32SChris Mason } 26111e701a32SChris Mason /* compression requires us to start the IO */ 26121e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 26131e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 26141e701a32SChris Mason range->extent_thresh = (u32)-1; 26151e701a32SChris Mason } 26161e701a32SChris Mason } else { 26171e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 26181e701a32SChris Mason range->len = (u64)-1; 26191e701a32SChris Mason } 2620496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 26214cb5300bSChris Mason range, 0, 0); 26224cb5300bSChris Mason if (ret > 0) 26234cb5300bSChris Mason ret = 0; 26241e701a32SChris Mason kfree(range); 2625f46b5a66SChristoph Hellwig break; 26268929ecfaSYan, Zheng default: 26278929ecfaSYan, Zheng ret = -EINVAL; 2628f46b5a66SChristoph Hellwig } 2629e441d54dSChris Mason out: 263025122d15SIlya Dryomov mnt_drop_write_file(file); 2631e441d54dSChris Mason return ret; 2632f46b5a66SChristoph Hellwig } 2633f46b5a66SChristoph Hellwig 2634b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2635f46b5a66SChristoph Hellwig { 2636f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2637f46b5a66SChristoph Hellwig int ret; 2638f46b5a66SChristoph Hellwig 2639e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2640e441d54dSChris Mason return -EPERM; 2641e441d54dSChris Mason 26425ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26435ac00addSStefan Behrens 1)) { 2644e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2645c9e9f97bSIlya Dryomov } 2646c9e9f97bSIlya Dryomov 26475ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2648dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2649c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2650c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2651c9e9f97bSIlya Dryomov goto out; 2652c9e9f97bSIlya Dryomov } 2653f46b5a66SChristoph Hellwig 26545516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2655f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2656f46b5a66SChristoph Hellwig 265743d20761SAnand Jain if (!ret) 265843d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 265943d20761SAnand Jain 2660f46b5a66SChristoph Hellwig kfree(vol_args); 2661c9e9f97bSIlya Dryomov out: 2662c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26635ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2664f46b5a66SChristoph Hellwig return ret; 2665f46b5a66SChristoph Hellwig } 2666f46b5a66SChristoph Hellwig 2667da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2668f46b5a66SChristoph Hellwig { 2669496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2670f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2671f46b5a66SChristoph Hellwig int ret; 2672f46b5a66SChristoph Hellwig 2673e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2674e441d54dSChris Mason return -EPERM; 2675e441d54dSChris Mason 2676da24927bSMiao Xie ret = mnt_want_write_file(file); 2677da24927bSMiao Xie if (ret) 2678da24927bSMiao Xie return ret; 2679c146afadSYan Zheng 2680dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2681c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2682c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2683c47ca32dSDan Carpenter goto err_drop; 2684c9e9f97bSIlya Dryomov } 2685f46b5a66SChristoph Hellwig 26865516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2687f46b5a66SChristoph Hellwig 2688183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2689183860f6SAnand Jain 1)) { 2690183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2691183860f6SAnand Jain goto out; 2692183860f6SAnand Jain } 2693183860f6SAnand Jain 2694183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2695183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2696c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26975ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2698183860f6SAnand Jain 2699ec95d491SAnand Jain if (!ret) 2700ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2701ec95d491SAnand Jain 2702183860f6SAnand Jain out: 2703183860f6SAnand Jain kfree(vol_args); 2704c47ca32dSDan Carpenter err_drop: 27054ac20c70SIlya Dryomov mnt_drop_write_file(file); 2706f46b5a66SChristoph Hellwig return ret; 2707f46b5a66SChristoph Hellwig } 2708f46b5a66SChristoph Hellwig 2709475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2710475f6387SJan Schmidt { 2711027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2712475f6387SJan Schmidt struct btrfs_device *device; 2713475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2714027ed2f0SLi Zefan int ret = 0; 2715475f6387SJan Schmidt 2716027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2717027ed2f0SLi Zefan if (!fi_args) 2718027ed2f0SLi Zefan return -ENOMEM; 2719027ed2f0SLi Zefan 2720f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2721027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2722027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2723475f6387SJan Schmidt 2724d7641a49SByongho Lee list_for_each_entry(device, &fs_devices->devices, dev_list) { 2725027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2726027ed2f0SLi Zefan fi_args->max_id = device->devid; 2727475f6387SJan Schmidt } 2728475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2729475f6387SJan Schmidt 273080a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 273180a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 273280a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 273380a773fbSDavid Sterba 2734027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2735027ed2f0SLi Zefan ret = -EFAULT; 2736475f6387SJan Schmidt 2737027ed2f0SLi Zefan kfree(fi_args); 2738027ed2f0SLi Zefan return ret; 2739475f6387SJan Schmidt } 2740475f6387SJan Schmidt 2741475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2742475f6387SJan Schmidt { 2743475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2744475f6387SJan Schmidt struct btrfs_device *dev; 2745475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2746475f6387SJan Schmidt int ret = 0; 2747475f6387SJan Schmidt char *s_uuid = NULL; 2748475f6387SJan Schmidt 2749475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2750475f6387SJan Schmidt if (IS_ERR(di_args)) 2751475f6387SJan Schmidt return PTR_ERR(di_args); 2752475f6387SJan Schmidt 2753dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2754475f6387SJan Schmidt s_uuid = di_args->uuid; 2755475f6387SJan Schmidt 2756475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2757aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2758475f6387SJan Schmidt 2759475f6387SJan Schmidt if (!dev) { 2760475f6387SJan Schmidt ret = -ENODEV; 2761475f6387SJan Schmidt goto out; 2762475f6387SJan Schmidt } 2763475f6387SJan Schmidt 2764475f6387SJan Schmidt di_args->devid = dev->devid; 27657cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27667cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2767475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2768a27202fbSJim Meyering if (dev->name) { 2769606686eeSJosef Bacik struct rcu_string *name; 2770606686eeSJosef Bacik 2771606686eeSJosef Bacik rcu_read_lock(); 2772606686eeSJosef Bacik name = rcu_dereference(dev->name); 2773606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2774606686eeSJosef Bacik rcu_read_unlock(); 2775a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2776a27202fbSJim Meyering } else { 277799ba55adSStefan Behrens di_args->path[0] = '\0'; 2778a27202fbSJim Meyering } 2779475f6387SJan Schmidt 2780475f6387SJan Schmidt out: 278155793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2782475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2783475f6387SJan Schmidt ret = -EFAULT; 2784475f6387SJan Schmidt 2785475f6387SJan Schmidt kfree(di_args); 2786475f6387SJan Schmidt return ret; 2787475f6387SJan Schmidt } 2788475f6387SJan Schmidt 2789f4414602SMark Fasheh static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) 2790416161dbSMark Fasheh { 2791416161dbSMark Fasheh struct page *page; 2792416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2793416161dbSMark Fasheh 2794416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2795416161dbSMark Fasheh if (!page) 2796416161dbSMark Fasheh return NULL; 2797416161dbSMark Fasheh 2798416161dbSMark Fasheh if (!PageUptodate(page)) { 2799416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2800416161dbSMark Fasheh 0)) 2801416161dbSMark Fasheh return NULL; 2802416161dbSMark Fasheh lock_page(page); 2803416161dbSMark Fasheh if (!PageUptodate(page)) { 2804416161dbSMark Fasheh unlock_page(page); 2805416161dbSMark Fasheh page_cache_release(page); 2806416161dbSMark Fasheh return NULL; 2807416161dbSMark Fasheh } 2808416161dbSMark Fasheh } 2809416161dbSMark Fasheh unlock_page(page); 2810416161dbSMark Fasheh 2811416161dbSMark Fasheh return page; 2812416161dbSMark Fasheh } 2813416161dbSMark Fasheh 2814f4414602SMark Fasheh static int gather_extent_pages(struct inode *inode, struct page **pages, 2815f4414602SMark Fasheh int num_pages, u64 off) 2816f4414602SMark Fasheh { 2817f4414602SMark Fasheh int i; 2818f4414602SMark Fasheh pgoff_t index = off >> PAGE_CACHE_SHIFT; 2819f4414602SMark Fasheh 2820f4414602SMark Fasheh for (i = 0; i < num_pages; i++) { 2821f4414602SMark Fasheh pages[i] = extent_same_get_page(inode, index + i); 2822f4414602SMark Fasheh if (!pages[i]) 2823f4414602SMark Fasheh return -ENOMEM; 2824f4414602SMark Fasheh } 2825f4414602SMark Fasheh return 0; 2826f4414602SMark Fasheh } 2827f4414602SMark Fasheh 282877fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 282977fe20dcSMark Fasheh { 283077fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 283177fe20dcSMark Fasheh another, and lock file content */ 283277fe20dcSMark Fasheh while (1) { 283377fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 283477fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 283577fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 283677fe20dcSMark Fasheh off + len - 1); 2837ff5df9b8SFilipe Manana if ((!ordered || 2838ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2839ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 284077fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2841ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2842ff5df9b8SFilipe Manana if (ordered) 2843ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 284477fe20dcSMark Fasheh break; 2845ff5df9b8SFilipe Manana } 284677fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 284777fe20dcSMark Fasheh if (ordered) 284877fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 284977fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 285077fe20dcSMark Fasheh } 285177fe20dcSMark Fasheh } 285277fe20dcSMark Fasheh 2853f4414602SMark Fasheh static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) 2854416161dbSMark Fasheh { 2855416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2856416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2857416161dbSMark Fasheh } 2858416161dbSMark Fasheh 2859f4414602SMark Fasheh static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) 2860f4414602SMark Fasheh { 2861f4414602SMark Fasheh if (inode1 < inode2) 2862f4414602SMark Fasheh swap(inode1, inode2); 2863f4414602SMark Fasheh 2864f4414602SMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2865f4414602SMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2866f4414602SMark Fasheh } 2867f4414602SMark Fasheh 2868f4414602SMark Fasheh static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, 2869f4414602SMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2870f4414602SMark Fasheh { 2871f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2872f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2873f4414602SMark Fasheh } 2874f4414602SMark Fasheh 2875f4414602SMark Fasheh static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1, 2876416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2877416161dbSMark Fasheh { 2878416161dbSMark Fasheh if (inode1 < inode2) { 2879416161dbSMark Fasheh swap(inode1, inode2); 2880416161dbSMark Fasheh swap(loff1, loff2); 2881416161dbSMark Fasheh } 2882416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2883416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2884416161dbSMark Fasheh } 2885f4414602SMark Fasheh 2886f4414602SMark Fasheh struct cmp_pages { 2887f4414602SMark Fasheh int num_pages; 2888f4414602SMark Fasheh struct page **src_pages; 2889f4414602SMark Fasheh struct page **dst_pages; 2890f4414602SMark Fasheh }; 2891f4414602SMark Fasheh 2892f4414602SMark Fasheh static void btrfs_cmp_data_free(struct cmp_pages *cmp) 2893f4414602SMark Fasheh { 2894f4414602SMark Fasheh int i; 2895f4414602SMark Fasheh struct page *pg; 2896f4414602SMark Fasheh 2897f4414602SMark Fasheh for (i = 0; i < cmp->num_pages; i++) { 2898f4414602SMark Fasheh pg = cmp->src_pages[i]; 2899f4414602SMark Fasheh if (pg) 2900f4414602SMark Fasheh page_cache_release(pg); 2901f4414602SMark Fasheh pg = cmp->dst_pages[i]; 2902f4414602SMark Fasheh if (pg) 2903f4414602SMark Fasheh page_cache_release(pg); 2904f4414602SMark Fasheh } 2905f4414602SMark Fasheh kfree(cmp->src_pages); 2906f4414602SMark Fasheh kfree(cmp->dst_pages); 2907f4414602SMark Fasheh } 2908f4414602SMark Fasheh 2909f4414602SMark Fasheh static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, 2910f4414602SMark Fasheh struct inode *dst, u64 dst_loff, 2911f4414602SMark Fasheh u64 len, struct cmp_pages *cmp) 2912f4414602SMark Fasheh { 2913f4414602SMark Fasheh int ret; 2914f4414602SMark Fasheh int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT; 2915f4414602SMark Fasheh struct page **src_pgarr, **dst_pgarr; 2916f4414602SMark Fasheh 2917f4414602SMark Fasheh /* 2918f4414602SMark Fasheh * We must gather up all the pages before we initiate our 2919f4414602SMark Fasheh * extent locking. We use an array for the page pointers. Size 2920f4414602SMark Fasheh * of the array is bounded by len, which is in turn bounded by 2921f4414602SMark Fasheh * BTRFS_MAX_DEDUPE_LEN. 2922f4414602SMark Fasheh */ 2923f4414602SMark Fasheh src_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); 2924f4414602SMark Fasheh dst_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); 2925f4414602SMark Fasheh if (!src_pgarr || !dst_pgarr) { 2926f4414602SMark Fasheh kfree(src_pgarr); 2927f4414602SMark Fasheh kfree(dst_pgarr); 2928f4414602SMark Fasheh return -ENOMEM; 2929f4414602SMark Fasheh } 2930f4414602SMark Fasheh cmp->num_pages = num_pages; 2931f4414602SMark Fasheh cmp->src_pages = src_pgarr; 2932f4414602SMark Fasheh cmp->dst_pages = dst_pgarr; 2933f4414602SMark Fasheh 2934f4414602SMark Fasheh ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); 2935f4414602SMark Fasheh if (ret) 2936f4414602SMark Fasheh goto out; 2937f4414602SMark Fasheh 2938f4414602SMark Fasheh ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); 2939f4414602SMark Fasheh 2940f4414602SMark Fasheh out: 2941f4414602SMark Fasheh if (ret) 2942f4414602SMark Fasheh btrfs_cmp_data_free(cmp); 2943f4414602SMark Fasheh return 0; 2944416161dbSMark Fasheh } 2945416161dbSMark Fasheh 2946416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2947f4414602SMark Fasheh u64 dst_loff, u64 len, struct cmp_pages *cmp) 2948416161dbSMark Fasheh { 2949416161dbSMark Fasheh int ret = 0; 2950f4414602SMark Fasheh int i; 2951416161dbSMark Fasheh struct page *src_page, *dst_page; 2952416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2953416161dbSMark Fasheh void *addr, *dst_addr; 2954416161dbSMark Fasheh 2955f4414602SMark Fasheh i = 0; 2956416161dbSMark Fasheh while (len) { 2957416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2958416161dbSMark Fasheh cmp_len = len; 2959416161dbSMark Fasheh 2960f4414602SMark Fasheh BUG_ON(i >= cmp->num_pages); 2961f4414602SMark Fasheh 2962f4414602SMark Fasheh src_page = cmp->src_pages[i]; 2963f4414602SMark Fasheh dst_page = cmp->dst_pages[i]; 2964f4414602SMark Fasheh 2965416161dbSMark Fasheh addr = kmap_atomic(src_page); 2966416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2967416161dbSMark Fasheh 2968416161dbSMark Fasheh flush_dcache_page(src_page); 2969416161dbSMark Fasheh flush_dcache_page(dst_page); 2970416161dbSMark Fasheh 2971416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2972416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2973416161dbSMark Fasheh 2974416161dbSMark Fasheh kunmap_atomic(addr); 2975416161dbSMark Fasheh kunmap_atomic(dst_addr); 2976416161dbSMark Fasheh 2977416161dbSMark Fasheh if (ret) 2978416161dbSMark Fasheh break; 2979416161dbSMark Fasheh 2980416161dbSMark Fasheh len -= cmp_len; 2981f4414602SMark Fasheh i++; 2982416161dbSMark Fasheh } 2983416161dbSMark Fasheh 2984416161dbSMark Fasheh return ret; 2985416161dbSMark Fasheh } 2986416161dbSMark Fasheh 2987e1d227a4SMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, 2988e1d227a4SMark Fasheh u64 olen) 2989416161dbSMark Fasheh { 2990e1d227a4SMark Fasheh u64 len = *plen; 2991416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2992416161dbSMark Fasheh 2993e1d227a4SMark Fasheh if (off + olen > inode->i_size || off + olen < off) 2994416161dbSMark Fasheh return -EINVAL; 2995e1d227a4SMark Fasheh 2996e1d227a4SMark Fasheh /* if we extend to eof, continue to block boundary */ 2997e1d227a4SMark Fasheh if (off + len == inode->i_size) 2998e1d227a4SMark Fasheh *plen = len = ALIGN(inode->i_size, bs) - off; 2999e1d227a4SMark Fasheh 3000416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 3001416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 3002416161dbSMark Fasheh return -EINVAL; 3003416161dbSMark Fasheh 3004416161dbSMark Fasheh return 0; 3005416161dbSMark Fasheh } 3006416161dbSMark Fasheh 3007e1d227a4SMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 3008416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 3009416161dbSMark Fasheh { 3010416161dbSMark Fasheh int ret; 3011e1d227a4SMark Fasheh u64 len = olen; 3012f4414602SMark Fasheh struct cmp_pages cmp; 30130efa9f48SMark Fasheh int same_inode = 0; 30140efa9f48SMark Fasheh u64 same_lock_start = 0; 30150efa9f48SMark Fasheh u64 same_lock_len = 0; 3016416161dbSMark Fasheh 3017416161dbSMark Fasheh if (src == dst) 30180efa9f48SMark Fasheh same_inode = 1; 3019416161dbSMark Fasheh 3020113e8283SFilipe Manana if (len == 0) 3021113e8283SFilipe Manana return 0; 3022113e8283SFilipe Manana 30230efa9f48SMark Fasheh if (same_inode) { 30240efa9f48SMark Fasheh mutex_lock(&src->i_mutex); 30250efa9f48SMark Fasheh 30260efa9f48SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 30270efa9f48SMark Fasheh if (ret) 30280efa9f48SMark Fasheh goto out_unlock; 30290efa9f48SMark Fasheh 30300efa9f48SMark Fasheh /* 30310efa9f48SMark Fasheh * Single inode case wants the same checks, except we 30320efa9f48SMark Fasheh * don't want our length pushed out past i_size as 30330efa9f48SMark Fasheh * comparing that data range makes no sense. 30340efa9f48SMark Fasheh * 30350efa9f48SMark Fasheh * extent_same_check_offsets() will do this for an 30360efa9f48SMark Fasheh * unaligned length at i_size, so catch it here and 30370efa9f48SMark Fasheh * reject the request. 30380efa9f48SMark Fasheh * 30390efa9f48SMark Fasheh * This effectively means we require aligned extents 30400efa9f48SMark Fasheh * for the single-inode case, whereas the other cases 30410efa9f48SMark Fasheh * allow an unaligned length so long as it ends at 30420efa9f48SMark Fasheh * i_size. 30430efa9f48SMark Fasheh */ 30440efa9f48SMark Fasheh if (len != olen) { 30450efa9f48SMark Fasheh ret = -EINVAL; 30460efa9f48SMark Fasheh goto out_unlock; 30470efa9f48SMark Fasheh } 30480efa9f48SMark Fasheh 30490efa9f48SMark Fasheh /* Check for overlapping ranges */ 30500efa9f48SMark Fasheh if (dst_loff + len > loff && dst_loff < loff + len) { 30510efa9f48SMark Fasheh ret = -EINVAL; 30520efa9f48SMark Fasheh goto out_unlock; 30530efa9f48SMark Fasheh } 30540efa9f48SMark Fasheh 30550efa9f48SMark Fasheh same_lock_start = min_t(u64, loff, dst_loff); 30560efa9f48SMark Fasheh same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; 30570efa9f48SMark Fasheh } else { 3058f4414602SMark Fasheh btrfs_double_inode_lock(src, dst); 3059416161dbSMark Fasheh 3060e1d227a4SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 3061416161dbSMark Fasheh if (ret) 3062416161dbSMark Fasheh goto out_unlock; 3063416161dbSMark Fasheh 3064e1d227a4SMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, &len, olen); 3065416161dbSMark Fasheh if (ret) 3066416161dbSMark Fasheh goto out_unlock; 30670efa9f48SMark Fasheh } 3068416161dbSMark Fasheh 3069416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 3070416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 3071416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 3072416161dbSMark Fasheh ret = -EINVAL; 3073416161dbSMark Fasheh goto out_unlock; 3074416161dbSMark Fasheh } 3075416161dbSMark Fasheh 3076f4414602SMark Fasheh ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); 3077f4414602SMark Fasheh if (ret) 3078f4414602SMark Fasheh goto out_unlock; 3079f4414602SMark Fasheh 30800efa9f48SMark Fasheh if (same_inode) 30810efa9f48SMark Fasheh lock_extent_range(src, same_lock_start, same_lock_len); 30820efa9f48SMark Fasheh else 3083f4414602SMark Fasheh btrfs_double_extent_lock(src, loff, dst, dst_loff, len); 3084f4414602SMark Fasheh 3085207910ddSMark Fasheh /* pass original length for comparison so we stay within i_size */ 3086f4414602SMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); 3087416161dbSMark Fasheh if (ret == 0) 30881c919a5eSMark Fasheh ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); 3089416161dbSMark Fasheh 30900efa9f48SMark Fasheh if (same_inode) 30910efa9f48SMark Fasheh unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, 30920efa9f48SMark Fasheh same_lock_start + same_lock_len - 1); 30930efa9f48SMark Fasheh else 3094f4414602SMark Fasheh btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); 3095f4414602SMark Fasheh 3096f4414602SMark Fasheh btrfs_cmp_data_free(&cmp); 3097416161dbSMark Fasheh out_unlock: 30980efa9f48SMark Fasheh if (same_inode) 30990efa9f48SMark Fasheh mutex_unlock(&src->i_mutex); 31000efa9f48SMark Fasheh else 3101f4414602SMark Fasheh btrfs_double_inode_unlock(src, dst); 3102416161dbSMark Fasheh 3103416161dbSMark Fasheh return ret; 3104416161dbSMark Fasheh } 3105416161dbSMark Fasheh 3106416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 3107416161dbSMark Fasheh 3108416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 31091c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 3110416161dbSMark Fasheh { 3111497b4050SFilipe Manana struct btrfs_ioctl_same_args *same = NULL; 3112cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 31131c1c8747SAl Viro struct inode *src = file_inode(file); 3114416161dbSMark Fasheh u64 off; 3115416161dbSMark Fasheh u64 len; 3116416161dbSMark Fasheh int i; 3117416161dbSMark Fasheh int ret; 3118cbf8b8caSMark Fasheh unsigned long size; 3119416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 3120416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 31211c1c8747SAl Viro u16 count; 3122416161dbSMark Fasheh 3123416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 3124416161dbSMark Fasheh return -EINVAL; 3125416161dbSMark Fasheh 3126416161dbSMark Fasheh ret = mnt_want_write_file(file); 3127416161dbSMark Fasheh if (ret) 3128416161dbSMark Fasheh return ret; 3129416161dbSMark Fasheh 31301c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 3131416161dbSMark Fasheh ret = -EFAULT; 3132416161dbSMark Fasheh goto out; 3133416161dbSMark Fasheh } 3134416161dbSMark Fasheh 31351c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 3136cbf8b8caSMark Fasheh 31371c1c8747SAl Viro same = memdup_user(argp, size); 3138cbf8b8caSMark Fasheh 3139229eed43SGeyslan G. Bem if (IS_ERR(same)) { 3140229eed43SGeyslan G. Bem ret = PTR_ERR(same); 3141497b4050SFilipe Manana same = NULL; 3142cbf8b8caSMark Fasheh goto out; 3143cbf8b8caSMark Fasheh } 3144cbf8b8caSMark Fasheh 3145cbf8b8caSMark Fasheh off = same->logical_offset; 3146cbf8b8caSMark Fasheh len = same->length; 3147416161dbSMark Fasheh 3148416161dbSMark Fasheh /* 3149416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 3150416161dbSMark Fasheh * This is intended to bound the total time spent in this 3151416161dbSMark Fasheh * ioctl to something sane. 3152416161dbSMark Fasheh */ 3153416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 3154416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 3155416161dbSMark Fasheh 3156416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 3157416161dbSMark Fasheh /* 3158416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 3159416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 3160416161dbSMark Fasheh * this situation without an update. 3161416161dbSMark Fasheh */ 3162416161dbSMark Fasheh ret = -EINVAL; 3163416161dbSMark Fasheh goto out; 3164416161dbSMark Fasheh } 3165416161dbSMark Fasheh 3166416161dbSMark Fasheh ret = -EISDIR; 3167416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 3168416161dbSMark Fasheh goto out; 3169416161dbSMark Fasheh 3170416161dbSMark Fasheh ret = -EACCES; 3171416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 3172416161dbSMark Fasheh goto out; 3173416161dbSMark Fasheh 3174cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 31751c1c8747SAl Viro for (i = 0; i < count; i++) { 3176cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 3177cbf8b8caSMark Fasheh same->info[i].status = 0; 3178416161dbSMark Fasheh } 3179416161dbSMark Fasheh 31801c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 31811c1c8747SAl Viro struct inode *dst; 31821c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 31831c1c8747SAl Viro if (!dst_file.file) { 3184cbf8b8caSMark Fasheh info->status = -EBADF; 31851c1c8747SAl Viro continue; 3186416161dbSMark Fasheh } 31871c1c8747SAl Viro dst = file_inode(dst_file.file); 3188416161dbSMark Fasheh 31891c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 3190cbf8b8caSMark Fasheh info->status = -EINVAL; 31911c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 3192cbf8b8caSMark Fasheh info->status = -EXDEV; 31931c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 3194cbf8b8caSMark Fasheh info->status = -EISDIR; 31951c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 3196cbf8b8caSMark Fasheh info->status = -EACCES; 31971c1c8747SAl Viro } else { 3198cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 3199cbf8b8caSMark Fasheh info->logical_offset); 3200cbf8b8caSMark Fasheh if (info->status == 0) 3201cbf8b8caSMark Fasheh info->bytes_deduped += len; 32021c1c8747SAl Viro } 32031c1c8747SAl Viro fdput(dst_file); 3204cbf8b8caSMark Fasheh } 3205416161dbSMark Fasheh 3206cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 3207cbf8b8caSMark Fasheh if (ret) 3208416161dbSMark Fasheh ret = -EFAULT; 3209416161dbSMark Fasheh 3210416161dbSMark Fasheh out: 3211416161dbSMark Fasheh mnt_drop_write_file(file); 3212497b4050SFilipe Manana kfree(same); 3213416161dbSMark Fasheh return ret; 3214416161dbSMark Fasheh } 3215416161dbSMark Fasheh 3216f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3217f82a9901SFilipe Manana struct inode *inode, 3218f82a9901SFilipe Manana u64 endoff, 3219f82a9901SFilipe Manana const u64 destoff, 32201c919a5eSMark Fasheh const u64 olen, 32211c919a5eSMark Fasheh int no_time_update) 3222f82a9901SFilipe Manana { 3223f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3224f82a9901SFilipe Manana int ret; 3225f82a9901SFilipe Manana 3226f82a9901SFilipe Manana inode_inc_iversion(inode); 32271c919a5eSMark Fasheh if (!no_time_update) 3228f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3229f82a9901SFilipe Manana /* 3230f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3231f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3232f82a9901SFilipe Manana */ 3233f82a9901SFilipe Manana if (endoff > destoff + olen) 3234f82a9901SFilipe Manana endoff = destoff + olen; 3235f82a9901SFilipe Manana if (endoff > inode->i_size) 3236f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3237f82a9901SFilipe Manana 3238f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3239f82a9901SFilipe Manana if (ret) { 3240f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3241f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3242f82a9901SFilipe Manana goto out; 3243f82a9901SFilipe Manana } 3244f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3245f82a9901SFilipe Manana out: 3246f82a9901SFilipe Manana return ret; 3247f82a9901SFilipe Manana } 3248f82a9901SFilipe Manana 32497ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 32507ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 32517ffbb598SFilipe Manana const struct btrfs_path *path, 32527ffbb598SFilipe Manana const u64 hole_offset, 32537ffbb598SFilipe Manana const u64 hole_len) 32547ffbb598SFilipe Manana { 32557ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 32567ffbb598SFilipe Manana struct extent_map *em; 32577ffbb598SFilipe Manana int ret; 32587ffbb598SFilipe Manana 32597ffbb598SFilipe Manana em = alloc_extent_map(); 32607ffbb598SFilipe Manana if (!em) { 32617ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32627ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32637ffbb598SFilipe Manana return; 32647ffbb598SFilipe Manana } 32657ffbb598SFilipe Manana 326614f59796SFilipe Manana if (path) { 326714f59796SFilipe Manana struct btrfs_file_extent_item *fi; 326814f59796SFilipe Manana 326914f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 327014f59796SFilipe Manana struct btrfs_file_extent_item); 32717ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 32727ffbb598SFilipe Manana em->generation = -1; 32737ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 32747ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 32757ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32767ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32777ffbb598SFilipe Manana } else { 32787ffbb598SFilipe Manana em->start = hole_offset; 32797ffbb598SFilipe Manana em->len = hole_len; 32807ffbb598SFilipe Manana em->ram_bytes = em->len; 32817ffbb598SFilipe Manana em->orig_start = hole_offset; 32827ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 32837ffbb598SFilipe Manana em->block_len = 0; 32847ffbb598SFilipe Manana em->orig_block_len = 0; 32857ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 32867ffbb598SFilipe Manana em->generation = trans->transid; 32877ffbb598SFilipe Manana } 32887ffbb598SFilipe Manana 32897ffbb598SFilipe Manana while (1) { 32907ffbb598SFilipe Manana write_lock(&em_tree->lock); 32917ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 32927ffbb598SFilipe Manana write_unlock(&em_tree->lock); 32937ffbb598SFilipe Manana if (ret != -EEXIST) { 32947ffbb598SFilipe Manana free_extent_map(em); 32957ffbb598SFilipe Manana break; 32967ffbb598SFilipe Manana } 32977ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 32987ffbb598SFilipe Manana em->start + em->len - 1, 0); 32997ffbb598SFilipe Manana } 33007ffbb598SFilipe Manana 3301ee39b432SDavid Sterba if (ret) 33027ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 33037ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 33047ffbb598SFilipe Manana } 33057ffbb598SFilipe Manana 33068039d87dSFilipe Manana /* 33078039d87dSFilipe Manana * Make sure we do not end up inserting an inline extent into a file that has 33088039d87dSFilipe Manana * already other (non-inline) extents. If a file has an inline extent it can 33098039d87dSFilipe Manana * not have any other extents and the (single) inline extent must start at the 33108039d87dSFilipe Manana * file offset 0. Failing to respect these rules will lead to file corruption, 33118039d87dSFilipe Manana * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc 33128039d87dSFilipe Manana * 33138039d87dSFilipe Manana * We can have extents that have been already written to disk or we can have 33148039d87dSFilipe Manana * dirty ranges still in delalloc, in which case the extent maps and items are 33158039d87dSFilipe Manana * created only when we run delalloc, and the delalloc ranges might fall outside 33168039d87dSFilipe Manana * the range we are currently locking in the inode's io tree. So we check the 33178039d87dSFilipe Manana * inode's i_size because of that (i_size updates are done while holding the 33188039d87dSFilipe Manana * i_mutex, which we are holding here). 33198039d87dSFilipe Manana * We also check to see if the inode has a size not greater than "datal" but has 33208039d87dSFilipe Manana * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are 33218039d87dSFilipe Manana * protected against such concurrent fallocate calls by the i_mutex). 33228039d87dSFilipe Manana * 33238039d87dSFilipe Manana * If the file has no extents but a size greater than datal, do not allow the 33248039d87dSFilipe Manana * copy because we would need turn the inline extent into a non-inline one (even 33258039d87dSFilipe Manana * with NO_HOLES enabled). If we find our destination inode only has one inline 33268039d87dSFilipe Manana * extent, just overwrite it with the source inline extent if its size is less 33278039d87dSFilipe Manana * than the source extent's size, or we could copy the source inline extent's 33288039d87dSFilipe Manana * data into the destination inode's inline extent if the later is greater then 33298039d87dSFilipe Manana * the former. 33308039d87dSFilipe Manana */ 33318039d87dSFilipe Manana static int clone_copy_inline_extent(struct inode *src, 33328039d87dSFilipe Manana struct inode *dst, 33338039d87dSFilipe Manana struct btrfs_trans_handle *trans, 33348039d87dSFilipe Manana struct btrfs_path *path, 33358039d87dSFilipe Manana struct btrfs_key *new_key, 33368039d87dSFilipe Manana const u64 drop_start, 33378039d87dSFilipe Manana const u64 datal, 33388039d87dSFilipe Manana const u64 skip, 33398039d87dSFilipe Manana const u64 size, 33408039d87dSFilipe Manana char *inline_data) 33418039d87dSFilipe Manana { 33428039d87dSFilipe Manana struct btrfs_root *root = BTRFS_I(dst)->root; 33438039d87dSFilipe Manana const u64 aligned_end = ALIGN(new_key->offset + datal, 33448039d87dSFilipe Manana root->sectorsize); 33458039d87dSFilipe Manana int ret; 33468039d87dSFilipe Manana struct btrfs_key key; 33478039d87dSFilipe Manana 33488039d87dSFilipe Manana if (new_key->offset > 0) 33498039d87dSFilipe Manana return -EOPNOTSUPP; 33508039d87dSFilipe Manana 33518039d87dSFilipe Manana key.objectid = btrfs_ino(dst); 33528039d87dSFilipe Manana key.type = BTRFS_EXTENT_DATA_KEY; 33538039d87dSFilipe Manana key.offset = 0; 33548039d87dSFilipe Manana ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 33558039d87dSFilipe Manana if (ret < 0) { 33568039d87dSFilipe Manana return ret; 33578039d87dSFilipe Manana } else if (ret > 0) { 33588039d87dSFilipe Manana if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 33598039d87dSFilipe Manana ret = btrfs_next_leaf(root, path); 33608039d87dSFilipe Manana if (ret < 0) 33618039d87dSFilipe Manana return ret; 33628039d87dSFilipe Manana else if (ret > 0) 33638039d87dSFilipe Manana goto copy_inline_extent; 33648039d87dSFilipe Manana } 33658039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 33668039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 33678039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) { 33688039d87dSFilipe Manana ASSERT(key.offset > 0); 33698039d87dSFilipe Manana return -EOPNOTSUPP; 33708039d87dSFilipe Manana } 33718039d87dSFilipe Manana } else if (i_size_read(dst) <= datal) { 33728039d87dSFilipe Manana struct btrfs_file_extent_item *ei; 33738039d87dSFilipe Manana u64 ext_len; 33748039d87dSFilipe Manana 33758039d87dSFilipe Manana /* 33768039d87dSFilipe Manana * If the file size is <= datal, make sure there are no other 33778039d87dSFilipe Manana * extents following (can happen do to an fallocate call with 33788039d87dSFilipe Manana * the flag FALLOC_FL_KEEP_SIZE). 33798039d87dSFilipe Manana */ 33808039d87dSFilipe Manana ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 33818039d87dSFilipe Manana struct btrfs_file_extent_item); 33828039d87dSFilipe Manana /* 33838039d87dSFilipe Manana * If it's an inline extent, it can not have other extents 33848039d87dSFilipe Manana * following it. 33858039d87dSFilipe Manana */ 33868039d87dSFilipe Manana if (btrfs_file_extent_type(path->nodes[0], ei) == 33878039d87dSFilipe Manana BTRFS_FILE_EXTENT_INLINE) 33888039d87dSFilipe Manana goto copy_inline_extent; 33898039d87dSFilipe Manana 33908039d87dSFilipe Manana ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); 33918039d87dSFilipe Manana if (ext_len > aligned_end) 33928039d87dSFilipe Manana return -EOPNOTSUPP; 33938039d87dSFilipe Manana 33948039d87dSFilipe Manana ret = btrfs_next_item(root, path); 33958039d87dSFilipe Manana if (ret < 0) { 33968039d87dSFilipe Manana return ret; 33978039d87dSFilipe Manana } else if (ret == 0) { 33988039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 33998039d87dSFilipe Manana path->slots[0]); 34008039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 34018039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) 34028039d87dSFilipe Manana return -EOPNOTSUPP; 34038039d87dSFilipe Manana } 34048039d87dSFilipe Manana } 34058039d87dSFilipe Manana 34068039d87dSFilipe Manana copy_inline_extent: 34078039d87dSFilipe Manana /* 34088039d87dSFilipe Manana * We have no extent items, or we have an extent at offset 0 which may 34098039d87dSFilipe Manana * or may not be inlined. All these cases are dealt the same way. 34108039d87dSFilipe Manana */ 34118039d87dSFilipe Manana if (i_size_read(dst) > datal) { 34128039d87dSFilipe Manana /* 34138039d87dSFilipe Manana * If the destination inode has an inline extent... 34148039d87dSFilipe Manana * This would require copying the data from the source inline 34158039d87dSFilipe Manana * extent into the beginning of the destination's inline extent. 34168039d87dSFilipe Manana * But this is really complex, both extents can be compressed 34178039d87dSFilipe Manana * or just one of them, which would require decompressing and 34188039d87dSFilipe Manana * re-compressing data (which could increase the new compressed 34198039d87dSFilipe Manana * size, not allowing the compressed data to fit anymore in an 34208039d87dSFilipe Manana * inline extent). 34218039d87dSFilipe Manana * So just don't support this case for now (it should be rare, 34228039d87dSFilipe Manana * we are not really saving space when cloning inline extents). 34238039d87dSFilipe Manana */ 34248039d87dSFilipe Manana return -EOPNOTSUPP; 34258039d87dSFilipe Manana } 34268039d87dSFilipe Manana 34278039d87dSFilipe Manana btrfs_release_path(path); 34288039d87dSFilipe Manana ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); 34298039d87dSFilipe Manana if (ret) 34308039d87dSFilipe Manana return ret; 34318039d87dSFilipe Manana ret = btrfs_insert_empty_item(trans, root, path, new_key, size); 34328039d87dSFilipe Manana if (ret) 34338039d87dSFilipe Manana return ret; 34348039d87dSFilipe Manana 34358039d87dSFilipe Manana if (skip) { 34368039d87dSFilipe Manana const u32 start = btrfs_file_extent_calc_inline_size(0); 34378039d87dSFilipe Manana 34388039d87dSFilipe Manana memmove(inline_data + start, inline_data + start + skip, datal); 34398039d87dSFilipe Manana } 34408039d87dSFilipe Manana 34418039d87dSFilipe Manana write_extent_buffer(path->nodes[0], inline_data, 34428039d87dSFilipe Manana btrfs_item_ptr_offset(path->nodes[0], 34438039d87dSFilipe Manana path->slots[0]), 34448039d87dSFilipe Manana size); 34458039d87dSFilipe Manana inode_add_bytes(dst, datal); 34468039d87dSFilipe Manana 34478039d87dSFilipe Manana return 0; 34488039d87dSFilipe Manana } 34498039d87dSFilipe Manana 345032b7c687SMark Fasheh /** 345132b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 345232b7c687SMark Fasheh * 345332b7c687SMark Fasheh * @src: Inode to clone from 345432b7c687SMark Fasheh * @inode: Inode to clone to 345532b7c687SMark Fasheh * @off: Offset within source to start clone from 345632b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 34571c919a5eSMark Fasheh * @olen_aligned: Block-aligned value of olen 345832b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 34591c919a5eSMark Fasheh * @no_time_update: Whether to update mtime/ctime on the target inode 346032b7c687SMark Fasheh */ 346132b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3462f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 34631c919a5eSMark Fasheh const u64 destoff, int no_time_update) 3464f46b5a66SChristoph Hellwig { 3465f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 346632b7c687SMark Fasheh struct btrfs_path *path = NULL; 3467f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 346832b7c687SMark Fasheh struct btrfs_trans_handle *trans; 346932b7c687SMark Fasheh char *buf = NULL; 3470ae01a0abSYan Zheng struct btrfs_key key; 3471f46b5a66SChristoph Hellwig u32 nritems; 3472f46b5a66SChristoph Hellwig int slot; 3473ae01a0abSYan Zheng int ret; 3474f82a9901SFilipe Manana const u64 len = olen_aligned; 3475f82a9901SFilipe Manana u64 last_dest_end = destoff; 3476ae01a0abSYan Zheng 3477ae01a0abSYan Zheng ret = -ENOMEM; 3478707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3479ae01a0abSYan Zheng if (!buf) 348032b7c687SMark Fasheh return ret; 3481ae01a0abSYan Zheng 3482ae01a0abSYan Zheng path = btrfs_alloc_path(); 3483ae01a0abSYan Zheng if (!path) { 3484ae01a0abSYan Zheng vfree(buf); 348532b7c687SMark Fasheh return ret; 3486ae01a0abSYan Zheng } 348732b7c687SMark Fasheh 3488e4058b54SDavid Sterba path->reada = READA_FORWARD; 3489c5c9cd4dSSage Weil /* clone data */ 349033345d01SLi Zefan key.objectid = btrfs_ino(src); 3491ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 34922c463823SFilipe Manana key.offset = off; 3493f46b5a66SChristoph Hellwig 3494f46b5a66SChristoph Hellwig while (1) { 3495de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3496df858e76SFilipe Manana 3497f46b5a66SChristoph Hellwig /* 3498f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3499f46b5a66SChristoph Hellwig * tree. 3500f46b5a66SChristoph Hellwig */ 3501e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3502362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3503362a20c5SDavid Sterba 0, 0); 3504f46b5a66SChristoph Hellwig if (ret < 0) 3505f46b5a66SChristoph Hellwig goto out; 35062c463823SFilipe Manana /* 35072c463823SFilipe Manana * First search, if no extent item that starts at offset off was 35082c463823SFilipe Manana * found but the previous item is an extent item, it's possible 35092c463823SFilipe Manana * it might overlap our target range, therefore process it. 35102c463823SFilipe Manana */ 35112c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 35122c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 35132c463823SFilipe Manana path->slots[0] - 1); 35142c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 35152c463823SFilipe Manana path->slots[0]--; 35162c463823SFilipe Manana } 3517f46b5a66SChristoph Hellwig 3518ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3519e4355f34SFilipe David Borba Manana process_slot: 3520ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3521362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3522f46b5a66SChristoph Hellwig if (ret < 0) 3523f46b5a66SChristoph Hellwig goto out; 3524f46b5a66SChristoph Hellwig if (ret > 0) 3525f46b5a66SChristoph Hellwig break; 3526ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3527f46b5a66SChristoph Hellwig } 3528f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3529f46b5a66SChristoph Hellwig slot = path->slots[0]; 3530f46b5a66SChristoph Hellwig 3531ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3532962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 353333345d01SLi Zefan key.objectid != btrfs_ino(src)) 3534f46b5a66SChristoph Hellwig break; 3535f46b5a66SChristoph Hellwig 3536962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3537c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3538c5c9cd4dSSage Weil int type; 353931840ae1SZheng Yan u32 size; 354031840ae1SZheng Yan struct btrfs_key new_key; 3541c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3542c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3543c5c9cd4dSSage Weil u8 comp; 3544f82a9901SFilipe Manana u64 drop_start; 354531840ae1SZheng Yan 3546c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3547c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3548c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3549c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3550c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3551c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3552d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3553d397712bSChris Mason extent); 3554d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3555d397712bSChris Mason extent); 3556c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3557d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3558d397712bSChris Mason extent); 3559c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3560c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3561c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3562c5c9cd4dSSage Weil extent); 3563c5c9cd4dSSage Weil } 356431840ae1SZheng Yan 35652c463823SFilipe Manana /* 35662c463823SFilipe Manana * The first search might have left us at an extent 35672c463823SFilipe Manana * item that ends before our target range's start, can 35682c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 35692c463823SFilipe Manana */ 35702c463823SFilipe Manana if (key.offset + datal <= off) { 3571e4355f34SFilipe David Borba Manana path->slots[0]++; 3572e4355f34SFilipe David Borba Manana goto process_slot; 35732c463823SFilipe Manana } else if (key.offset >= off + len) { 35742c463823SFilipe Manana break; 3575e4355f34SFilipe David Borba Manana } 3576df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3577e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3578e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3579e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3580e4355f34SFilipe David Borba Manana size); 3581e4355f34SFilipe David Borba Manana 3582e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3583e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3584c5c9cd4dSSage Weil 358531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 358633345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 35874d728ec7SLi Zefan if (off <= key.offset) 3588c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 35894d728ec7SLi Zefan else 35904d728ec7SLi Zefan new_key.offset = destoff; 3591c5c9cd4dSSage Weil 3592b6f3409bSSage Weil /* 3593f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3594f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3595f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3596f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3597f82a9901SFilipe Manana * partially overlaps it). 3598f82a9901SFilipe Manana */ 3599f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3600f82a9901SFilipe Manana drop_start = last_dest_end; 3601f82a9901SFilipe Manana else 3602f82a9901SFilipe Manana drop_start = new_key.offset; 3603f82a9901SFilipe Manana 3604f82a9901SFilipe Manana /* 3605b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3606b6f3409bSSage Weil * 1 - add new extent 3607b6f3409bSSage Weil * 1 - inode update 3608b6f3409bSSage Weil */ 3609b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3610a22285a6SYan, Zheng if (IS_ERR(trans)) { 3611a22285a6SYan, Zheng ret = PTR_ERR(trans); 3612a22285a6SYan, Zheng goto out; 3613a22285a6SYan, Zheng } 3614a22285a6SYan, Zheng 3615c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3616c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3617d72c0842SLi Zefan /* 3618d72c0842SLi Zefan * a | --- range to clone ---| b 3619d72c0842SLi Zefan * | ------------- extent ------------- | 3620d72c0842SLi Zefan */ 3621d72c0842SLi Zefan 362293915584SAntonio Ospite /* subtract range b */ 3623d72c0842SLi Zefan if (key.offset + datal > off + len) 3624d72c0842SLi Zefan datal = off + len - key.offset; 3625d72c0842SLi Zefan 362693915584SAntonio Ospite /* subtract range a */ 3627a22285a6SYan, Zheng if (off > key.offset) { 3628a22285a6SYan, Zheng datao += off - key.offset; 3629a22285a6SYan, Zheng datal -= off - key.offset; 3630a22285a6SYan, Zheng } 3631a22285a6SYan, Zheng 36325dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3633f82a9901SFilipe Manana drop_start, 3634a22285a6SYan, Zheng new_key.offset + datal, 36352671485dSJosef Bacik 1); 363679787eaaSJeff Mahoney if (ret) { 36373f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 363800fdf13aSLiu Bo btrfs_abort_transaction(trans, 363900fdf13aSLiu Bo root, ret); 364079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 364179787eaaSJeff Mahoney goto out; 364279787eaaSJeff Mahoney } 3643a22285a6SYan, Zheng 364431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 364531840ae1SZheng Yan &new_key, size); 364679787eaaSJeff Mahoney if (ret) { 364779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 364879787eaaSJeff Mahoney ret); 364979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 365079787eaaSJeff Mahoney goto out; 365179787eaaSJeff Mahoney } 365231840ae1SZheng Yan 365331840ae1SZheng Yan leaf = path->nodes[0]; 365431840ae1SZheng Yan slot = path->slots[0]; 365531840ae1SZheng Yan write_extent_buffer(leaf, buf, 365631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 365731840ae1SZheng Yan size); 3658ae01a0abSYan Zheng 3659f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3660f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3661c5c9cd4dSSage Weil 3662c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3663c5c9cd4dSSage Weil if (!disko) 3664c5c9cd4dSSage Weil datao = 0; 3665c5c9cd4dSSage Weil 3666c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3667c5c9cd4dSSage Weil datao); 3668c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3669c5c9cd4dSSage Weil datal); 3670fcebe456SJosef Bacik 3671c5c9cd4dSSage Weil if (disko) { 3672c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3673ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 36745d4f98a2SYan Zheng disko, diskl, 0, 3675f46b5a66SChristoph Hellwig root->root_key.objectid, 367633345d01SLi Zefan btrfs_ino(inode), 3677b06c4bf5SFilipe Manana new_key.offset - datao); 367879787eaaSJeff Mahoney if (ret) { 367979787eaaSJeff Mahoney btrfs_abort_transaction(trans, 368079787eaaSJeff Mahoney root, 368179787eaaSJeff Mahoney ret); 368279787eaaSJeff Mahoney btrfs_end_transaction(trans, 368379787eaaSJeff Mahoney root); 368479787eaaSJeff Mahoney goto out; 368579787eaaSJeff Mahoney 368679787eaaSJeff Mahoney } 3687f46b5a66SChristoph Hellwig } 3688c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3689c5c9cd4dSSage Weil u64 skip = 0; 3690c5c9cd4dSSage Weil u64 trim = 0; 3691ed958762SFilipe Manana 3692c5c9cd4dSSage Weil if (off > key.offset) { 3693c5c9cd4dSSage Weil skip = off - key.offset; 3694c5c9cd4dSSage Weil new_key.offset += skip; 369531840ae1SZheng Yan } 3696d397712bSChris Mason 3697c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3698c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3699d397712bSChris Mason 3700c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3701c5c9cd4dSSage Weil ret = -EINVAL; 3702a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3703c5c9cd4dSSage Weil goto out; 370431840ae1SZheng Yan } 3705c5c9cd4dSSage Weil size -= skip + trim; 3706c5c9cd4dSSage Weil datal -= skip + trim; 3707a22285a6SYan, Zheng 37088039d87dSFilipe Manana ret = clone_copy_inline_extent(src, inode, 37098039d87dSFilipe Manana trans, path, 37108039d87dSFilipe Manana &new_key, 3711f82a9901SFilipe Manana drop_start, 37128039d87dSFilipe Manana datal, 37138039d87dSFilipe Manana skip, size, buf); 371479787eaaSJeff Mahoney if (ret) { 37153f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 37163a29bc09SChris Mason btrfs_abort_transaction(trans, 37178039d87dSFilipe Manana root, 371879787eaaSJeff Mahoney ret); 371979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 372079787eaaSJeff Mahoney goto out; 372179787eaaSJeff Mahoney } 3722c5c9cd4dSSage Weil leaf = path->nodes[0]; 3723c5c9cd4dSSage Weil slot = path->slots[0]; 3724c5c9cd4dSSage Weil } 3725c5c9cd4dSSage Weil 37267ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 37277ffbb598SFilipe Manana if (drop_start < new_key.offset) 37287ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 372914f59796SFilipe Manana NULL, drop_start, 37307ffbb598SFilipe Manana new_key.offset - drop_start); 37317ffbb598SFilipe Manana 373214f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 37337ffbb598SFilipe Manana 3734c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3735b3b4aa74SDavid Sterba btrfs_release_path(path); 3736c5c9cd4dSSage Weil 373762e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 373862e2390eSFilipe Manana root->sectorsize); 3739f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3740f82a9901SFilipe Manana last_dest_end, 37411c919a5eSMark Fasheh destoff, olen, 37421c919a5eSMark Fasheh no_time_update); 3743f82a9901SFilipe Manana if (ret) 374479787eaaSJeff Mahoney goto out; 37452c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 37462c463823SFilipe Manana break; 3747a22285a6SYan, Zheng } 3748b3b4aa74SDavid Sterba btrfs_release_path(path); 3749df858e76SFilipe Manana key.offset = next_key_min_offset; 3750ae01a0abSYan Zheng } 3751f46b5a66SChristoph Hellwig ret = 0; 375232b7c687SMark Fasheh 3753f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3754f82a9901SFilipe Manana /* 3755f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3756f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3757f82a9901SFilipe Manana */ 3758b3b4aa74SDavid Sterba btrfs_release_path(path); 3759f82a9901SFilipe Manana 3760f82a9901SFilipe Manana /* 3761f82a9901SFilipe Manana * 1 - remove extent(s) 3762f82a9901SFilipe Manana * 1 - inode update 3763f82a9901SFilipe Manana */ 3764f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3765f82a9901SFilipe Manana if (IS_ERR(trans)) { 3766f82a9901SFilipe Manana ret = PTR_ERR(trans); 3767f82a9901SFilipe Manana goto out; 3768f82a9901SFilipe Manana } 3769f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3770f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3771f82a9901SFilipe Manana if (ret) { 3772f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3773f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3774f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3775f82a9901SFilipe Manana goto out; 3776f82a9901SFilipe Manana } 377714f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 377814f59796SFilipe Manana destoff + len - last_dest_end); 3779f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 37801c919a5eSMark Fasheh destoff, olen, no_time_update); 3781f82a9901SFilipe Manana } 3782f82a9901SFilipe Manana 3783f46b5a66SChristoph Hellwig out: 378432b7c687SMark Fasheh btrfs_free_path(path); 378532b7c687SMark Fasheh vfree(buf); 378632b7c687SMark Fasheh return ret; 378732b7c687SMark Fasheh } 378832b7c687SMark Fasheh 378932b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 379032b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 379132b7c687SMark Fasheh { 379254563d41SAl Viro struct inode *inode = file_inode(file); 379332b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 379432b7c687SMark Fasheh struct fd src_file; 379532b7c687SMark Fasheh struct inode *src; 379632b7c687SMark Fasheh int ret; 379732b7c687SMark Fasheh u64 len = olen; 379832b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 379932b7c687SMark Fasheh int same_inode = 0; 380032b7c687SMark Fasheh 380132b7c687SMark Fasheh /* 380232b7c687SMark Fasheh * TODO: 380332b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 380432b7c687SMark Fasheh * decompress into destination's address_space (the file offset 380532b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 380632b7c687SMark Fasheh * otherwise reinsert) a subrange. 380700fdf13aSLiu Bo * 380800fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 380900fdf13aSLiu Bo * be either compressed or non-compressed. 381032b7c687SMark Fasheh */ 381132b7c687SMark Fasheh 381232b7c687SMark Fasheh /* the destination must be opened for writing */ 381332b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 381432b7c687SMark Fasheh return -EINVAL; 381532b7c687SMark Fasheh 381632b7c687SMark Fasheh if (btrfs_root_readonly(root)) 381732b7c687SMark Fasheh return -EROFS; 381832b7c687SMark Fasheh 381932b7c687SMark Fasheh ret = mnt_want_write_file(file); 382032b7c687SMark Fasheh if (ret) 382132b7c687SMark Fasheh return ret; 382232b7c687SMark Fasheh 382332b7c687SMark Fasheh src_file = fdget(srcfd); 382432b7c687SMark Fasheh if (!src_file.file) { 382532b7c687SMark Fasheh ret = -EBADF; 382632b7c687SMark Fasheh goto out_drop_write; 382732b7c687SMark Fasheh } 382832b7c687SMark Fasheh 382932b7c687SMark Fasheh ret = -EXDEV; 383032b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 383132b7c687SMark Fasheh goto out_fput; 383232b7c687SMark Fasheh 383332b7c687SMark Fasheh src = file_inode(src_file.file); 383432b7c687SMark Fasheh 383532b7c687SMark Fasheh ret = -EINVAL; 383632b7c687SMark Fasheh if (src == inode) 383732b7c687SMark Fasheh same_inode = 1; 383832b7c687SMark Fasheh 383932b7c687SMark Fasheh /* the src must be open for reading */ 384032b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 384132b7c687SMark Fasheh goto out_fput; 384232b7c687SMark Fasheh 384332b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 384432b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 384532b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 384632b7c687SMark Fasheh goto out_fput; 384732b7c687SMark Fasheh 384832b7c687SMark Fasheh ret = -EISDIR; 384932b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 385032b7c687SMark Fasheh goto out_fput; 385132b7c687SMark Fasheh 385232b7c687SMark Fasheh ret = -EXDEV; 385332b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 385432b7c687SMark Fasheh goto out_fput; 385532b7c687SMark Fasheh 385632b7c687SMark Fasheh if (!same_inode) { 3857293a8489SMark Fasheh btrfs_double_inode_lock(src, inode); 385832b7c687SMark Fasheh } else { 385932b7c687SMark Fasheh mutex_lock(&src->i_mutex); 386032b7c687SMark Fasheh } 386132b7c687SMark Fasheh 386232b7c687SMark Fasheh /* determine range to clone */ 386332b7c687SMark Fasheh ret = -EINVAL; 386432b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 386532b7c687SMark Fasheh goto out_unlock; 386632b7c687SMark Fasheh if (len == 0) 386732b7c687SMark Fasheh olen = len = src->i_size - off; 386832b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 386932b7c687SMark Fasheh if (off + len == src->i_size) 387032b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 387132b7c687SMark Fasheh 3872ccccf3d6SFilipe Manana if (len == 0) { 3873ccccf3d6SFilipe Manana ret = 0; 3874ccccf3d6SFilipe Manana goto out_unlock; 3875ccccf3d6SFilipe Manana } 3876ccccf3d6SFilipe Manana 387732b7c687SMark Fasheh /* verify the end result is block aligned */ 387832b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 387932b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 388032b7c687SMark Fasheh goto out_unlock; 388132b7c687SMark Fasheh 388232b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 388332b7c687SMark Fasheh if (same_inode) { 388432b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 388532b7c687SMark Fasheh goto out_unlock; 388632b7c687SMark Fasheh } 388732b7c687SMark Fasheh 388832b7c687SMark Fasheh if (destoff > inode->i_size) { 388932b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 389032b7c687SMark Fasheh if (ret) 389132b7c687SMark Fasheh goto out_unlock; 389232b7c687SMark Fasheh } 389332b7c687SMark Fasheh 3894c125b8bfSFilipe Manana /* 3895c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3896c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3897c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3898c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3899c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3900c125b8bfSFilipe Manana */ 3901c125b8bfSFilipe Manana if (same_inode) { 3902c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3903c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 390432b7c687SMark Fasheh 3905c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3906c125b8bfSFilipe Manana } else { 3907293a8489SMark Fasheh btrfs_double_extent_lock(src, off, inode, destoff, len); 3908c125b8bfSFilipe Manana } 390932b7c687SMark Fasheh 39101c919a5eSMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); 391132b7c687SMark Fasheh 3912c125b8bfSFilipe Manana if (same_inode) { 3913c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3914c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3915c125b8bfSFilipe Manana 3916c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3917c125b8bfSFilipe Manana } else { 3918293a8489SMark Fasheh btrfs_double_extent_unlock(src, off, inode, destoff, len); 3919c125b8bfSFilipe Manana } 3920c125b8bfSFilipe Manana /* 3921c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3922c125b8bfSFilipe Manana * data immediately and not the previous data. 3923c125b8bfSFilipe Manana */ 3924c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3925c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3926f46b5a66SChristoph Hellwig out_unlock: 3927293a8489SMark Fasheh if (!same_inode) 3928293a8489SMark Fasheh btrfs_double_inode_unlock(src, inode); 3929293a8489SMark Fasheh else 3930f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3931f46b5a66SChristoph Hellwig out_fput: 39322903ff01SAl Viro fdput(src_file); 3933ab67b7c1SYan Zheng out_drop_write: 39342a79f17eSAl Viro mnt_drop_write_file(file); 3935f46b5a66SChristoph Hellwig return ret; 3936f46b5a66SChristoph Hellwig } 3937f46b5a66SChristoph Hellwig 39387a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3939c5c9cd4dSSage Weil { 3940c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3941c5c9cd4dSSage Weil 39427a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3943c5c9cd4dSSage Weil return -EFAULT; 3944c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3945c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3946c5c9cd4dSSage Weil } 3947c5c9cd4dSSage Weil 3948f46b5a66SChristoph Hellwig /* 3949f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3950f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3951f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3952f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3953f46b5a66SChristoph Hellwig */ 3954b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3955f46b5a66SChristoph Hellwig { 3956496ad9aaSAl Viro struct inode *inode = file_inode(file); 3957f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3958f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 39591ab86aedSSage Weil int ret; 3960f46b5a66SChristoph Hellwig 39611ab86aedSSage Weil ret = -EPERM; 3962df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3963f46b5a66SChristoph Hellwig goto out; 39641ab86aedSSage Weil 39651ab86aedSSage Weil ret = -EINPROGRESS; 39661ab86aedSSage Weil if (file->private_data) 39671ab86aedSSage Weil goto out; 39689ca9ee09SSage Weil 3969b83cc969SLi Zefan ret = -EROFS; 3970b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3971b83cc969SLi Zefan goto out; 3972b83cc969SLi Zefan 3973a561be71SAl Viro ret = mnt_want_write_file(file); 3974c146afadSYan Zheng if (ret) 3975c146afadSYan Zheng goto out; 3976c146afadSYan Zheng 3977a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 39789ca9ee09SSage Weil 3979f46b5a66SChristoph Hellwig ret = -ENOMEM; 39807a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3981abd30bb0STsutomu Itoh if (IS_ERR(trans)) 39821ab86aedSSage Weil goto out_drop; 39831ab86aedSSage Weil 39841ab86aedSSage Weil file->private_data = trans; 39851ab86aedSSage Weil return 0; 39861ab86aedSSage Weil 39871ab86aedSSage Weil out_drop: 3988a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 39892a79f17eSAl Viro mnt_drop_write_file(file); 3990f46b5a66SChristoph Hellwig out: 3991f46b5a66SChristoph Hellwig return ret; 3992f46b5a66SChristoph Hellwig } 3993f46b5a66SChristoph Hellwig 39946ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 39956ef5ed0dSJosef Bacik { 3996496ad9aaSAl Viro struct inode *inode = file_inode(file); 39976ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 39986ef5ed0dSJosef Bacik struct btrfs_root *new_root; 39996ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 40006ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 40016ef5ed0dSJosef Bacik struct btrfs_path *path; 40026ef5ed0dSJosef Bacik struct btrfs_key location; 40036ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 40046ef5ed0dSJosef Bacik u64 objectid = 0; 40056ef5ed0dSJosef Bacik u64 dir_id; 40063c04ce01SMiao Xie int ret; 40076ef5ed0dSJosef Bacik 40086ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 40096ef5ed0dSJosef Bacik return -EPERM; 40106ef5ed0dSJosef Bacik 40113c04ce01SMiao Xie ret = mnt_want_write_file(file); 40123c04ce01SMiao Xie if (ret) 40133c04ce01SMiao Xie return ret; 40143c04ce01SMiao Xie 40153c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 40163c04ce01SMiao Xie ret = -EFAULT; 40173c04ce01SMiao Xie goto out; 40183c04ce01SMiao Xie } 40196ef5ed0dSJosef Bacik 40206ef5ed0dSJosef Bacik if (!objectid) 40211cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 40226ef5ed0dSJosef Bacik 40236ef5ed0dSJosef Bacik location.objectid = objectid; 40246ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 40256ef5ed0dSJosef Bacik location.offset = (u64)-1; 40266ef5ed0dSJosef Bacik 40276ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 40283c04ce01SMiao Xie if (IS_ERR(new_root)) { 40293c04ce01SMiao Xie ret = PTR_ERR(new_root); 40303c04ce01SMiao Xie goto out; 40313c04ce01SMiao Xie } 40326ef5ed0dSJosef Bacik 40336ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 40343c04ce01SMiao Xie if (!path) { 40353c04ce01SMiao Xie ret = -ENOMEM; 40363c04ce01SMiao Xie goto out; 40373c04ce01SMiao Xie } 40386ef5ed0dSJosef Bacik path->leave_spinning = 1; 40396ef5ed0dSJosef Bacik 40406ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 404198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 40426ef5ed0dSJosef Bacik btrfs_free_path(path); 40433c04ce01SMiao Xie ret = PTR_ERR(trans); 40443c04ce01SMiao Xie goto out; 40456ef5ed0dSJosef Bacik } 40466ef5ed0dSJosef Bacik 40476c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 40486ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 40496ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 4050cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 40516ef5ed0dSJosef Bacik btrfs_free_path(path); 40526ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 4053efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 4054efe120a0SFrank Holton "item, this isn't going to work"); 40553c04ce01SMiao Xie ret = -ENOENT; 40563c04ce01SMiao Xie goto out; 40576ef5ed0dSJosef Bacik } 40586ef5ed0dSJosef Bacik 40596ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 40606ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 40616ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 40626ef5ed0dSJosef Bacik btrfs_free_path(path); 40636ef5ed0dSJosef Bacik 40642b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 40656ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 40663c04ce01SMiao Xie out: 40673c04ce01SMiao Xie mnt_drop_write_file(file); 40683c04ce01SMiao Xie return ret; 40696ef5ed0dSJosef Bacik } 40706ef5ed0dSJosef Bacik 40715af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 4072bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 4073bf5fc093SJosef Bacik { 4074bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 4075bf5fc093SJosef Bacik 4076bf5fc093SJosef Bacik space->total_bytes = 0; 4077bf5fc093SJosef Bacik space->used_bytes = 0; 4078bf5fc093SJosef Bacik space->flags = 0; 4079bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 4080bf5fc093SJosef Bacik space->flags = block_group->flags; 4081bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 4082bf5fc093SJosef Bacik space->used_bytes += 4083bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 4084bf5fc093SJosef Bacik } 4085bf5fc093SJosef Bacik } 4086bf5fc093SJosef Bacik 408748a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 40881406e432SJosef Bacik { 40891406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 40901406e432SJosef Bacik struct btrfs_ioctl_space_info space; 40911406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 40927fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 409313f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 40941406e432SJosef Bacik struct btrfs_space_info *info; 4095bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 4096bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 4097bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 4098bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 4099bf5fc093SJosef Bacik int num_types = 4; 41007fde62bfSChris Mason int alloc_size; 41011406e432SJosef Bacik int ret = 0; 410251788b1bSDan Rosenberg u64 slot_count = 0; 4103bf5fc093SJosef Bacik int i, c; 41041406e432SJosef Bacik 41051406e432SJosef Bacik if (copy_from_user(&space_args, 41061406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 41071406e432SJosef Bacik sizeof(space_args))) 41081406e432SJosef Bacik return -EFAULT; 41091406e432SJosef Bacik 4110bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4111bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4112bf5fc093SJosef Bacik 4113bf5fc093SJosef Bacik info = NULL; 41147fde62bfSChris Mason rcu_read_lock(); 4115bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4116bf5fc093SJosef Bacik list) { 4117bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4118bf5fc093SJosef Bacik info = tmp; 4119bf5fc093SJosef Bacik break; 4120bf5fc093SJosef Bacik } 4121bf5fc093SJosef Bacik } 41227fde62bfSChris Mason rcu_read_unlock(); 41231406e432SJosef Bacik 4124bf5fc093SJosef Bacik if (!info) 4125bf5fc093SJosef Bacik continue; 4126bf5fc093SJosef Bacik 4127bf5fc093SJosef Bacik down_read(&info->groups_sem); 4128bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4129bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 4130bf5fc093SJosef Bacik slot_count++; 4131bf5fc093SJosef Bacik } 4132bf5fc093SJosef Bacik up_read(&info->groups_sem); 4133bf5fc093SJosef Bacik } 4134bf5fc093SJosef Bacik 413536523e95SDavid Sterba /* 413636523e95SDavid Sterba * Global block reserve, exported as a space_info 413736523e95SDavid Sterba */ 413836523e95SDavid Sterba slot_count++; 413936523e95SDavid Sterba 41407fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 41417fde62bfSChris Mason if (space_args.space_slots == 0) { 41427fde62bfSChris Mason space_args.total_spaces = slot_count; 41437fde62bfSChris Mason goto out; 41447fde62bfSChris Mason } 4145bf5fc093SJosef Bacik 414651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 4147bf5fc093SJosef Bacik 41487fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 4149bf5fc093SJosef Bacik 41507fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 41517fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 41527fde62bfSChris Mason */ 41537fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 41547fde62bfSChris Mason return -ENOMEM; 41557fde62bfSChris Mason 41567fde62bfSChris Mason space_args.total_spaces = 0; 41577fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 41587fde62bfSChris Mason if (!dest) 41597fde62bfSChris Mason return -ENOMEM; 41607fde62bfSChris Mason dest_orig = dest; 41617fde62bfSChris Mason 41627fde62bfSChris Mason /* now we have a buffer to copy into */ 4163bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4164bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4165bf5fc093SJosef Bacik 416651788b1bSDan Rosenberg if (!slot_count) 416751788b1bSDan Rosenberg break; 416851788b1bSDan Rosenberg 4169bf5fc093SJosef Bacik info = NULL; 41701406e432SJosef Bacik rcu_read_lock(); 4171bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4172bf5fc093SJosef Bacik list) { 4173bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4174bf5fc093SJosef Bacik info = tmp; 41757fde62bfSChris Mason break; 4176bf5fc093SJosef Bacik } 4177bf5fc093SJosef Bacik } 4178bf5fc093SJosef Bacik rcu_read_unlock(); 41797fde62bfSChris Mason 4180bf5fc093SJosef Bacik if (!info) 4181bf5fc093SJosef Bacik continue; 4182bf5fc093SJosef Bacik down_read(&info->groups_sem); 4183bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4184bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 41855af3e8ccSStefan Behrens btrfs_get_block_group_info( 41865af3e8ccSStefan Behrens &info->block_groups[c], &space); 41877fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 41881406e432SJosef Bacik dest++; 41891406e432SJosef Bacik space_args.total_spaces++; 419051788b1bSDan Rosenberg slot_count--; 41911406e432SJosef Bacik } 419251788b1bSDan Rosenberg if (!slot_count) 419351788b1bSDan Rosenberg break; 4194bf5fc093SJosef Bacik } 4195bf5fc093SJosef Bacik up_read(&info->groups_sem); 4196bf5fc093SJosef Bacik } 41971406e432SJosef Bacik 419836523e95SDavid Sterba /* 419936523e95SDavid Sterba * Add global block reserve 420036523e95SDavid Sterba */ 420136523e95SDavid Sterba if (slot_count) { 420236523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 420336523e95SDavid Sterba 420436523e95SDavid Sterba spin_lock(&block_rsv->lock); 420536523e95SDavid Sterba space.total_bytes = block_rsv->size; 420636523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 420736523e95SDavid Sterba spin_unlock(&block_rsv->lock); 420836523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 420936523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 421036523e95SDavid Sterba space_args.total_spaces++; 421136523e95SDavid Sterba } 421236523e95SDavid Sterba 42132eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 42147fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 42157fde62bfSChris Mason 42167fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 42177fde62bfSChris Mason ret = -EFAULT; 42187fde62bfSChris Mason 42197fde62bfSChris Mason kfree(dest_orig); 42207fde62bfSChris Mason out: 42217fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 42221406e432SJosef Bacik ret = -EFAULT; 42231406e432SJosef Bacik 42241406e432SJosef Bacik return ret; 42251406e432SJosef Bacik } 42261406e432SJosef Bacik 4227f46b5a66SChristoph Hellwig /* 4228f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4229f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4230f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4231f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4232f46b5a66SChristoph Hellwig */ 4233f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4234f46b5a66SChristoph Hellwig { 4235496ad9aaSAl Viro struct inode *inode = file_inode(file); 4236f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4237f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4238f46b5a66SChristoph Hellwig 4239f46b5a66SChristoph Hellwig trans = file->private_data; 42401ab86aedSSage Weil if (!trans) 42411ab86aedSSage Weil return -EINVAL; 4242b214107eSChristoph Hellwig file->private_data = NULL; 42439ca9ee09SSage Weil 42441ab86aedSSage Weil btrfs_end_transaction(trans, root); 42451ab86aedSSage Weil 4246a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 42479ca9ee09SSage Weil 42482a79f17eSAl Viro mnt_drop_write_file(file); 42491ab86aedSSage Weil return 0; 4250f46b5a66SChristoph Hellwig } 4251f46b5a66SChristoph Hellwig 42529a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 42539a8c28beSMiao Xie void __user *argp) 425446204592SSage Weil { 425546204592SSage Weil struct btrfs_trans_handle *trans; 425646204592SSage Weil u64 transid; 4257db5b493aSTsutomu Itoh int ret; 425846204592SSage Weil 4259d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4260ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4261ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 426298d5dc13STsutomu Itoh return PTR_ERR(trans); 4263ff7c1d33SMiao Xie 4264ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4265ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4266ff7c1d33SMiao Xie goto out; 4267ff7c1d33SMiao Xie } 426846204592SSage Weil transid = trans->transid; 4269db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 42708b2b2d3cSTsutomu Itoh if (ret) { 42718b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4272db5b493aSTsutomu Itoh return ret; 42738b2b2d3cSTsutomu Itoh } 4274ff7c1d33SMiao Xie out: 427546204592SSage Weil if (argp) 427646204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 427746204592SSage Weil return -EFAULT; 427846204592SSage Weil return 0; 427946204592SSage Weil } 428046204592SSage Weil 42819a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 42829a8c28beSMiao Xie void __user *argp) 428346204592SSage Weil { 428446204592SSage Weil u64 transid; 428546204592SSage Weil 428646204592SSage Weil if (argp) { 428746204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 428846204592SSage Weil return -EFAULT; 428946204592SSage Weil } else { 429046204592SSage Weil transid = 0; /* current trans */ 429146204592SSage Weil } 429246204592SSage Weil return btrfs_wait_for_commit(root, transid); 429346204592SSage Weil } 429446204592SSage Weil 4295b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4296475f6387SJan Schmidt { 4297496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4298475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4299b8e95489SMiao Xie int ret; 4300475f6387SJan Schmidt 4301475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4302475f6387SJan Schmidt return -EPERM; 4303475f6387SJan Schmidt 4304475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4305475f6387SJan Schmidt if (IS_ERR(sa)) 4306475f6387SJan Schmidt return PTR_ERR(sa); 4307475f6387SJan Schmidt 4308b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4309b8e95489SMiao Xie ret = mnt_want_write_file(file); 4310b8e95489SMiao Xie if (ret) 4311b8e95489SMiao Xie goto out; 4312b8e95489SMiao Xie } 4313b8e95489SMiao Xie 4314aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 431563a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 431663a212abSStefan Behrens 0); 4317475f6387SJan Schmidt 4318475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4319475f6387SJan Schmidt ret = -EFAULT; 4320475f6387SJan Schmidt 4321b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4322b8e95489SMiao Xie mnt_drop_write_file(file); 4323b8e95489SMiao Xie out: 4324475f6387SJan Schmidt kfree(sa); 4325475f6387SJan Schmidt return ret; 4326475f6387SJan Schmidt } 4327475f6387SJan Schmidt 4328475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4329475f6387SJan Schmidt { 4330475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4331475f6387SJan Schmidt return -EPERM; 4332475f6387SJan Schmidt 4333aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4334475f6387SJan Schmidt } 4335475f6387SJan Schmidt 4336475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4337475f6387SJan Schmidt void __user *arg) 4338475f6387SJan Schmidt { 4339475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4340475f6387SJan Schmidt int ret; 4341475f6387SJan Schmidt 4342475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4343475f6387SJan Schmidt return -EPERM; 4344475f6387SJan Schmidt 4345475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4346475f6387SJan Schmidt if (IS_ERR(sa)) 4347475f6387SJan Schmidt return PTR_ERR(sa); 4348475f6387SJan Schmidt 4349475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4350475f6387SJan Schmidt 4351475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4352475f6387SJan Schmidt ret = -EFAULT; 4353475f6387SJan Schmidt 4354475f6387SJan Schmidt kfree(sa); 4355475f6387SJan Schmidt return ret; 4356475f6387SJan Schmidt } 4357475f6387SJan Schmidt 4358c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4359b27f7c0cSDavid Sterba void __user *arg) 4360c11d2c23SStefan Behrens { 4361c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4362c11d2c23SStefan Behrens int ret; 4363c11d2c23SStefan Behrens 4364c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4365c11d2c23SStefan Behrens if (IS_ERR(sa)) 4366c11d2c23SStefan Behrens return PTR_ERR(sa); 4367c11d2c23SStefan Behrens 4368b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4369b27f7c0cSDavid Sterba kfree(sa); 4370b27f7c0cSDavid Sterba return -EPERM; 4371b27f7c0cSDavid Sterba } 4372b27f7c0cSDavid Sterba 4373b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4374c11d2c23SStefan Behrens 4375c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4376c11d2c23SStefan Behrens ret = -EFAULT; 4377c11d2c23SStefan Behrens 4378c11d2c23SStefan Behrens kfree(sa); 4379c11d2c23SStefan Behrens return ret; 4380c11d2c23SStefan Behrens } 4381c11d2c23SStefan Behrens 43823f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 43833f6bcfbdSStefan Behrens { 43843f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 43853f6bcfbdSStefan Behrens int ret; 43863f6bcfbdSStefan Behrens 43873f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 43883f6bcfbdSStefan Behrens return -EPERM; 43893f6bcfbdSStefan Behrens 43903f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 43913f6bcfbdSStefan Behrens if (IS_ERR(p)) 43923f6bcfbdSStefan Behrens return PTR_ERR(p); 43933f6bcfbdSStefan Behrens 43943f6bcfbdSStefan Behrens switch (p->cmd) { 43953f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4396adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4397adfa97cbSIlya Dryomov ret = -EROFS; 4398adfa97cbSIlya Dryomov goto out; 4399adfa97cbSIlya Dryomov } 44003f6bcfbdSStefan Behrens if (atomic_xchg( 44013f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 44023f6bcfbdSStefan Behrens 1)) { 4403e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 44043f6bcfbdSStefan Behrens } else { 44053f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 44063f6bcfbdSStefan Behrens atomic_set( 44073f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 44083f6bcfbdSStefan Behrens 0); 44093f6bcfbdSStefan Behrens } 44103f6bcfbdSStefan Behrens break; 44113f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 44123f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 44133f6bcfbdSStefan Behrens ret = 0; 44143f6bcfbdSStefan Behrens break; 44153f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 44163f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 44173f6bcfbdSStefan Behrens break; 44183f6bcfbdSStefan Behrens default: 44193f6bcfbdSStefan Behrens ret = -EINVAL; 44203f6bcfbdSStefan Behrens break; 44213f6bcfbdSStefan Behrens } 44223f6bcfbdSStefan Behrens 44233f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 44243f6bcfbdSStefan Behrens ret = -EFAULT; 4425adfa97cbSIlya Dryomov out: 44263f6bcfbdSStefan Behrens kfree(p); 44273f6bcfbdSStefan Behrens return ret; 44283f6bcfbdSStefan Behrens } 44293f6bcfbdSStefan Behrens 4430d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4431d7728c96SJan Schmidt { 4432d7728c96SJan Schmidt int ret = 0; 4433d7728c96SJan Schmidt int i; 4434740c3d22SChris Mason u64 rel_ptr; 4435d7728c96SJan Schmidt int size; 4436806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4437d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4438d7728c96SJan Schmidt struct btrfs_path *path; 4439d7728c96SJan Schmidt 444082b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4441d7728c96SJan Schmidt return -EPERM; 4442d7728c96SJan Schmidt 4443d7728c96SJan Schmidt path = btrfs_alloc_path(); 4444d7728c96SJan Schmidt if (!path) { 4445d7728c96SJan Schmidt ret = -ENOMEM; 4446d7728c96SJan Schmidt goto out; 4447d7728c96SJan Schmidt } 4448d7728c96SJan Schmidt 4449d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4450d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4451d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4452d7728c96SJan Schmidt ipa = NULL; 4453d7728c96SJan Schmidt goto out; 4454d7728c96SJan Schmidt } 4455d7728c96SJan Schmidt 4456d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4457d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4458d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4459d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4460d7728c96SJan Schmidt ipath = NULL; 4461d7728c96SJan Schmidt goto out; 4462d7728c96SJan Schmidt } 4463d7728c96SJan Schmidt 4464d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4465d7728c96SJan Schmidt if (ret < 0) 4466d7728c96SJan Schmidt goto out; 4467d7728c96SJan Schmidt 4468d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4469745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4470745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4471740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4472d7728c96SJan Schmidt } 4473d7728c96SJan Schmidt 4474745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4475745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4476d7728c96SJan Schmidt if (ret) { 4477d7728c96SJan Schmidt ret = -EFAULT; 4478d7728c96SJan Schmidt goto out; 4479d7728c96SJan Schmidt } 4480d7728c96SJan Schmidt 4481d7728c96SJan Schmidt out: 4482d7728c96SJan Schmidt btrfs_free_path(path); 4483d7728c96SJan Schmidt free_ipath(ipath); 4484d7728c96SJan Schmidt kfree(ipa); 4485d7728c96SJan Schmidt 4486d7728c96SJan Schmidt return ret; 4487d7728c96SJan Schmidt } 4488d7728c96SJan Schmidt 4489d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4490d7728c96SJan Schmidt { 4491d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4492d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4493d7728c96SJan Schmidt 4494d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4495d7728c96SJan Schmidt inodes->bytes_left -= c; 4496d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4497d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4498d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4499d7728c96SJan Schmidt inodes->elem_cnt += 3; 4500d7728c96SJan Schmidt } else { 4501d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4502d7728c96SJan Schmidt inodes->bytes_left = 0; 4503d7728c96SJan Schmidt inodes->elem_missed += 3; 4504d7728c96SJan Schmidt } 4505d7728c96SJan Schmidt 4506d7728c96SJan Schmidt return 0; 4507d7728c96SJan Schmidt } 4508d7728c96SJan Schmidt 4509d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4510d7728c96SJan Schmidt void __user *arg) 4511d7728c96SJan Schmidt { 4512d7728c96SJan Schmidt int ret = 0; 4513d7728c96SJan Schmidt int size; 4514d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4515d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4516d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4517d7728c96SJan Schmidt 4518d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4519d7728c96SJan Schmidt return -EPERM; 4520d7728c96SJan Schmidt 4521d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4522d7728c96SJan Schmidt if (IS_ERR(loi)) { 4523d7728c96SJan Schmidt ret = PTR_ERR(loi); 4524d7728c96SJan Schmidt loi = NULL; 4525d7728c96SJan Schmidt goto out; 4526d7728c96SJan Schmidt } 4527d7728c96SJan Schmidt 4528d7728c96SJan Schmidt path = btrfs_alloc_path(); 4529d7728c96SJan Schmidt if (!path) { 4530d7728c96SJan Schmidt ret = -ENOMEM; 4531d7728c96SJan Schmidt goto out; 4532d7728c96SJan Schmidt } 4533d7728c96SJan Schmidt 4534425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4535d7728c96SJan Schmidt inodes = init_data_container(size); 4536d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4537d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4538d7728c96SJan Schmidt inodes = NULL; 4539d7728c96SJan Schmidt goto out; 4540d7728c96SJan Schmidt } 4541d7728c96SJan Schmidt 4542df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4543df031f07SLiu Bo build_ino_list, inodes); 4544df031f07SLiu Bo if (ret == -EINVAL) 4545d7728c96SJan Schmidt ret = -ENOENT; 4546d7728c96SJan Schmidt if (ret < 0) 4547d7728c96SJan Schmidt goto out; 4548d7728c96SJan Schmidt 4549745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4550745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4551d7728c96SJan Schmidt if (ret) 4552d7728c96SJan Schmidt ret = -EFAULT; 4553d7728c96SJan Schmidt 4554d7728c96SJan Schmidt out: 4555d7728c96SJan Schmidt btrfs_free_path(path); 4556425d17a2SLiu Bo vfree(inodes); 4557d7728c96SJan Schmidt kfree(loi); 4558d7728c96SJan Schmidt 4559d7728c96SJan Schmidt return ret; 4560d7728c96SJan Schmidt } 4561d7728c96SJan Schmidt 456219a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4563c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4564c9e9f97bSIlya Dryomov { 4565c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4566c9e9f97bSIlya Dryomov 4567c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4568c9e9f97bSIlya Dryomov 4569837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4570837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4571837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4572837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4573a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4574a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4575837d5b6eSIlya Dryomov 4576c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4577c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4578c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 457919a39dceSIlya Dryomov 458019a39dceSIlya Dryomov if (lock) { 458119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 458219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 458319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 458419a39dceSIlya Dryomov } else { 458519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 458619a39dceSIlya Dryomov } 4587c9e9f97bSIlya Dryomov } 4588c9e9f97bSIlya Dryomov 45899ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4590c9e9f97bSIlya Dryomov { 4591496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4592c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4593c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4594c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4595ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4596c9e9f97bSIlya Dryomov int ret; 4597c9e9f97bSIlya Dryomov 4598c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4599c9e9f97bSIlya Dryomov return -EPERM; 4600c9e9f97bSIlya Dryomov 4601e54bfa31SLiu Bo ret = mnt_want_write_file(file); 46029ba1f6e4SLiu Bo if (ret) 46039ba1f6e4SLiu Bo return ret; 46049ba1f6e4SLiu Bo 4605ed0fb78fSIlya Dryomov again: 4606ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4607c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4608c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4609ed0fb78fSIlya Dryomov need_unlock = true; 4610ed0fb78fSIlya Dryomov goto locked; 4611ed0fb78fSIlya Dryomov } 4612ed0fb78fSIlya Dryomov 4613ed0fb78fSIlya Dryomov /* 4614ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4615ed0fb78fSIlya Dryomov * (1) some other op is running 4616ed0fb78fSIlya Dryomov * (2) balance is running 4617ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4618ed0fb78fSIlya Dryomov */ 4619ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4620ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4621ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4622ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4623ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4624ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4625ed0fb78fSIlya Dryomov goto again; 4626ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4627ed0fb78fSIlya Dryomov 4628ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4629ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4630ed0fb78fSIlya Dryomov /* this is (3) */ 4631ed0fb78fSIlya Dryomov need_unlock = false; 4632ed0fb78fSIlya Dryomov goto locked; 4633ed0fb78fSIlya Dryomov } 4634ed0fb78fSIlya Dryomov 4635ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4636ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4637ed0fb78fSIlya Dryomov goto again; 4638ed0fb78fSIlya Dryomov } else { 4639ed0fb78fSIlya Dryomov /* this is (2) */ 4640ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4641ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4642ed0fb78fSIlya Dryomov goto out; 4643ed0fb78fSIlya Dryomov } 4644ed0fb78fSIlya Dryomov } else { 4645ed0fb78fSIlya Dryomov /* this is (1) */ 4646ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4647e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4648ed0fb78fSIlya Dryomov goto out; 4649ed0fb78fSIlya Dryomov } 4650ed0fb78fSIlya Dryomov 4651ed0fb78fSIlya Dryomov locked: 4652ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4653c9e9f97bSIlya Dryomov 4654c9e9f97bSIlya Dryomov if (arg) { 4655c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4656c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4657c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4658ed0fb78fSIlya Dryomov goto out_unlock; 4659c9e9f97bSIlya Dryomov } 4660de322263SIlya Dryomov 4661de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4662de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4663de322263SIlya Dryomov ret = -ENOTCONN; 4664de322263SIlya Dryomov goto out_bargs; 4665de322263SIlya Dryomov } 4666de322263SIlya Dryomov 4667de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4668de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4669de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4670de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4671de322263SIlya Dryomov 4672de322263SIlya Dryomov goto do_balance; 4673de322263SIlya Dryomov } 4674c9e9f97bSIlya Dryomov } else { 4675c9e9f97bSIlya Dryomov bargs = NULL; 4676c9e9f97bSIlya Dryomov } 4677c9e9f97bSIlya Dryomov 4678ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4679837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4680837d5b6eSIlya Dryomov goto out_bargs; 4681837d5b6eSIlya Dryomov } 4682837d5b6eSIlya Dryomov 4683c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4684c9e9f97bSIlya Dryomov if (!bctl) { 4685c9e9f97bSIlya Dryomov ret = -ENOMEM; 4686c9e9f97bSIlya Dryomov goto out_bargs; 4687c9e9f97bSIlya Dryomov } 4688c9e9f97bSIlya Dryomov 4689c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4690c9e9f97bSIlya Dryomov if (arg) { 4691c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4692c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4693c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4694c9e9f97bSIlya Dryomov 4695c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4696f43ffb60SIlya Dryomov } else { 4697f43ffb60SIlya Dryomov /* balance everything - no filters */ 4698f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4699c9e9f97bSIlya Dryomov } 4700c9e9f97bSIlya Dryomov 47018eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 47028eb93459SDavid Sterba ret = -EINVAL; 47030f89abf5SChristian Engelmayer goto out_bctl; 47048eb93459SDavid Sterba } 47058eb93459SDavid Sterba 4706de322263SIlya Dryomov do_balance: 4707c9e9f97bSIlya Dryomov /* 4708ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4709ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4710ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4711ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4712ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4713c9e9f97bSIlya Dryomov */ 4714ed0fb78fSIlya Dryomov need_unlock = false; 4715ed0fb78fSIlya Dryomov 4716ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 47170f89abf5SChristian Engelmayer bctl = NULL; 4718ed0fb78fSIlya Dryomov 4719c9e9f97bSIlya Dryomov if (arg) { 4720c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4721c9e9f97bSIlya Dryomov ret = -EFAULT; 4722c9e9f97bSIlya Dryomov } 4723c9e9f97bSIlya Dryomov 47240f89abf5SChristian Engelmayer out_bctl: 47250f89abf5SChristian Engelmayer kfree(bctl); 4726c9e9f97bSIlya Dryomov out_bargs: 4727c9e9f97bSIlya Dryomov kfree(bargs); 4728ed0fb78fSIlya Dryomov out_unlock: 4729c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4730c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4731ed0fb78fSIlya Dryomov if (need_unlock) 4732ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4733ed0fb78fSIlya Dryomov out: 4734e54bfa31SLiu Bo mnt_drop_write_file(file); 4735c9e9f97bSIlya Dryomov return ret; 4736c9e9f97bSIlya Dryomov } 4737c9e9f97bSIlya Dryomov 4738837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4739837d5b6eSIlya Dryomov { 4740837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4741837d5b6eSIlya Dryomov return -EPERM; 4742837d5b6eSIlya Dryomov 4743837d5b6eSIlya Dryomov switch (cmd) { 4744837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4745837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4746a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4747a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4748837d5b6eSIlya Dryomov } 4749837d5b6eSIlya Dryomov 4750837d5b6eSIlya Dryomov return -EINVAL; 4751837d5b6eSIlya Dryomov } 4752837d5b6eSIlya Dryomov 475319a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 475419a39dceSIlya Dryomov void __user *arg) 475519a39dceSIlya Dryomov { 475619a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 475719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 475819a39dceSIlya Dryomov int ret = 0; 475919a39dceSIlya Dryomov 476019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 476119a39dceSIlya Dryomov return -EPERM; 476219a39dceSIlya Dryomov 476319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 476419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 476519a39dceSIlya Dryomov ret = -ENOTCONN; 476619a39dceSIlya Dryomov goto out; 476719a39dceSIlya Dryomov } 476819a39dceSIlya Dryomov 476919a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 477019a39dceSIlya Dryomov if (!bargs) { 477119a39dceSIlya Dryomov ret = -ENOMEM; 477219a39dceSIlya Dryomov goto out; 477319a39dceSIlya Dryomov } 477419a39dceSIlya Dryomov 477519a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 477619a39dceSIlya Dryomov 477719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 477819a39dceSIlya Dryomov ret = -EFAULT; 477919a39dceSIlya Dryomov 478019a39dceSIlya Dryomov kfree(bargs); 478119a39dceSIlya Dryomov out: 478219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 478319a39dceSIlya Dryomov return ret; 478419a39dceSIlya Dryomov } 478519a39dceSIlya Dryomov 4786905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 47875d13a37bSArne Jansen { 4788496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47895d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 47905d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 47915d13a37bSArne Jansen int ret; 47925d13a37bSArne Jansen int err; 47935d13a37bSArne Jansen 47945d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47955d13a37bSArne Jansen return -EPERM; 47965d13a37bSArne Jansen 4797905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4798905b0ddaSMiao Xie if (ret) 4799905b0ddaSMiao Xie return ret; 48005d13a37bSArne Jansen 48015d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4802905b0ddaSMiao Xie if (IS_ERR(sa)) { 4803905b0ddaSMiao Xie ret = PTR_ERR(sa); 4804905b0ddaSMiao Xie goto drop_write; 4805905b0ddaSMiao Xie } 48065d13a37bSArne Jansen 48077708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 480892f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 48095d13a37bSArne Jansen if (IS_ERR(trans)) { 48105d13a37bSArne Jansen ret = PTR_ERR(trans); 48115d13a37bSArne Jansen goto out; 48125d13a37bSArne Jansen } 48135d13a37bSArne Jansen 48145d13a37bSArne Jansen switch (sa->cmd) { 48155d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 48165d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 48175d13a37bSArne Jansen break; 48185d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 48195d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 48205d13a37bSArne Jansen break; 48215d13a37bSArne Jansen default: 48225d13a37bSArne Jansen ret = -EINVAL; 48235d13a37bSArne Jansen break; 48245d13a37bSArne Jansen } 48255d13a37bSArne Jansen 482692f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 48275d13a37bSArne Jansen if (err && !ret) 48285d13a37bSArne Jansen ret = err; 48295d13a37bSArne Jansen out: 48305d13a37bSArne Jansen kfree(sa); 48317708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4832905b0ddaSMiao Xie drop_write: 4833905b0ddaSMiao Xie mnt_drop_write_file(file); 48345d13a37bSArne Jansen return ret; 48355d13a37bSArne Jansen } 48365d13a37bSArne Jansen 4837905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 48385d13a37bSArne Jansen { 4839496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48405d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 48415d13a37bSArne Jansen struct btrfs_trans_handle *trans; 48425d13a37bSArne Jansen int ret; 48435d13a37bSArne Jansen int err; 48445d13a37bSArne Jansen 48455d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 48465d13a37bSArne Jansen return -EPERM; 48475d13a37bSArne Jansen 4848905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4849905b0ddaSMiao Xie if (ret) 4850905b0ddaSMiao Xie return ret; 48515d13a37bSArne Jansen 48525d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4853905b0ddaSMiao Xie if (IS_ERR(sa)) { 4854905b0ddaSMiao Xie ret = PTR_ERR(sa); 4855905b0ddaSMiao Xie goto drop_write; 4856905b0ddaSMiao Xie } 48575d13a37bSArne Jansen 48585d13a37bSArne Jansen trans = btrfs_join_transaction(root); 48595d13a37bSArne Jansen if (IS_ERR(trans)) { 48605d13a37bSArne Jansen ret = PTR_ERR(trans); 48615d13a37bSArne Jansen goto out; 48625d13a37bSArne Jansen } 48635d13a37bSArne Jansen 48645d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 48655d13a37bSArne Jansen if (sa->assign) { 48665d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 48675d13a37bSArne Jansen sa->src, sa->dst); 48685d13a37bSArne Jansen } else { 48695d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 48705d13a37bSArne Jansen sa->src, sa->dst); 48715d13a37bSArne Jansen } 48725d13a37bSArne Jansen 4873e082f563SQu Wenruo /* update qgroup status and info */ 4874e082f563SQu Wenruo err = btrfs_run_qgroups(trans, root->fs_info); 4875e082f563SQu Wenruo if (err < 0) 4876a4553fefSAnand Jain btrfs_std_error(root->fs_info, ret, 4877e082f563SQu Wenruo "failed to update qgroup status and info\n"); 48785d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 48795d13a37bSArne Jansen if (err && !ret) 48805d13a37bSArne Jansen ret = err; 48815d13a37bSArne Jansen 48825d13a37bSArne Jansen out: 48835d13a37bSArne Jansen kfree(sa); 4884905b0ddaSMiao Xie drop_write: 4885905b0ddaSMiao Xie mnt_drop_write_file(file); 48865d13a37bSArne Jansen return ret; 48875d13a37bSArne Jansen } 48885d13a37bSArne Jansen 4889905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 48905d13a37bSArne Jansen { 4891496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48925d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 48935d13a37bSArne Jansen struct btrfs_trans_handle *trans; 48945d13a37bSArne Jansen int ret; 48955d13a37bSArne Jansen int err; 48965d13a37bSArne Jansen 48975d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 48985d13a37bSArne Jansen return -EPERM; 48995d13a37bSArne Jansen 4900905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4901905b0ddaSMiao Xie if (ret) 4902905b0ddaSMiao Xie return ret; 49035d13a37bSArne Jansen 49045d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4905905b0ddaSMiao Xie if (IS_ERR(sa)) { 4906905b0ddaSMiao Xie ret = PTR_ERR(sa); 4907905b0ddaSMiao Xie goto drop_write; 4908905b0ddaSMiao Xie } 49095d13a37bSArne Jansen 4910d86e56cfSMiao Xie if (!sa->qgroupid) { 4911d86e56cfSMiao Xie ret = -EINVAL; 4912d86e56cfSMiao Xie goto out; 4913d86e56cfSMiao Xie } 4914d86e56cfSMiao Xie 49155d13a37bSArne Jansen trans = btrfs_join_transaction(root); 49165d13a37bSArne Jansen if (IS_ERR(trans)) { 49175d13a37bSArne Jansen ret = PTR_ERR(trans); 49185d13a37bSArne Jansen goto out; 49195d13a37bSArne Jansen } 49205d13a37bSArne Jansen 49215d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 49225d13a37bSArne Jansen if (sa->create) { 49234087cf24SDongsheng Yang ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); 49245d13a37bSArne Jansen } else { 49255d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 49265d13a37bSArne Jansen } 49275d13a37bSArne Jansen 49285d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 49295d13a37bSArne Jansen if (err && !ret) 49305d13a37bSArne Jansen ret = err; 49315d13a37bSArne Jansen 49325d13a37bSArne Jansen out: 49335d13a37bSArne Jansen kfree(sa); 4934905b0ddaSMiao Xie drop_write: 4935905b0ddaSMiao Xie mnt_drop_write_file(file); 49365d13a37bSArne Jansen return ret; 49375d13a37bSArne Jansen } 49385d13a37bSArne Jansen 4939905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 49405d13a37bSArne Jansen { 4941496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49425d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 49435d13a37bSArne Jansen struct btrfs_trans_handle *trans; 49445d13a37bSArne Jansen int ret; 49455d13a37bSArne Jansen int err; 49465d13a37bSArne Jansen u64 qgroupid; 49475d13a37bSArne Jansen 49485d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 49495d13a37bSArne Jansen return -EPERM; 49505d13a37bSArne Jansen 4951905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4952905b0ddaSMiao Xie if (ret) 4953905b0ddaSMiao Xie return ret; 49545d13a37bSArne Jansen 49555d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4956905b0ddaSMiao Xie if (IS_ERR(sa)) { 4957905b0ddaSMiao Xie ret = PTR_ERR(sa); 4958905b0ddaSMiao Xie goto drop_write; 4959905b0ddaSMiao Xie } 49605d13a37bSArne Jansen 49615d13a37bSArne Jansen trans = btrfs_join_transaction(root); 49625d13a37bSArne Jansen if (IS_ERR(trans)) { 49635d13a37bSArne Jansen ret = PTR_ERR(trans); 49645d13a37bSArne Jansen goto out; 49655d13a37bSArne Jansen } 49665d13a37bSArne Jansen 49675d13a37bSArne Jansen qgroupid = sa->qgroupid; 49685d13a37bSArne Jansen if (!qgroupid) { 49695d13a37bSArne Jansen /* take the current subvol as qgroup */ 49705d13a37bSArne Jansen qgroupid = root->root_key.objectid; 49715d13a37bSArne Jansen } 49725d13a37bSArne Jansen 49735d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 49745d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 49755d13a37bSArne Jansen 49765d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 49775d13a37bSArne Jansen if (err && !ret) 49785d13a37bSArne Jansen ret = err; 49795d13a37bSArne Jansen 49805d13a37bSArne Jansen out: 49815d13a37bSArne Jansen kfree(sa); 4982905b0ddaSMiao Xie drop_write: 4983905b0ddaSMiao Xie mnt_drop_write_file(file); 49845d13a37bSArne Jansen return ret; 49855d13a37bSArne Jansen } 49865d13a37bSArne Jansen 49872f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 49882f232036SJan Schmidt { 49896d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49902f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 49912f232036SJan Schmidt int ret; 49922f232036SJan Schmidt 49932f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 49942f232036SJan Schmidt return -EPERM; 49952f232036SJan Schmidt 49962f232036SJan Schmidt ret = mnt_want_write_file(file); 49972f232036SJan Schmidt if (ret) 49982f232036SJan Schmidt return ret; 49992f232036SJan Schmidt 50002f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 50012f232036SJan Schmidt if (IS_ERR(qsa)) { 50022f232036SJan Schmidt ret = PTR_ERR(qsa); 50032f232036SJan Schmidt goto drop_write; 50042f232036SJan Schmidt } 50052f232036SJan Schmidt 50062f232036SJan Schmidt if (qsa->flags) { 50072f232036SJan Schmidt ret = -EINVAL; 50082f232036SJan Schmidt goto out; 50092f232036SJan Schmidt } 50102f232036SJan Schmidt 50112f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 50122f232036SJan Schmidt 50132f232036SJan Schmidt out: 50142f232036SJan Schmidt kfree(qsa); 50152f232036SJan Schmidt drop_write: 50162f232036SJan Schmidt mnt_drop_write_file(file); 50172f232036SJan Schmidt return ret; 50182f232036SJan Schmidt } 50192f232036SJan Schmidt 50202f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 50212f232036SJan Schmidt { 50226d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 50232f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 50242f232036SJan Schmidt int ret = 0; 50252f232036SJan Schmidt 50262f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 50272f232036SJan Schmidt return -EPERM; 50282f232036SJan Schmidt 50292f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 50302f232036SJan Schmidt if (!qsa) 50312f232036SJan Schmidt return -ENOMEM; 50322f232036SJan Schmidt 50332f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 50342f232036SJan Schmidt qsa->flags = 1; 50352f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 50362f232036SJan Schmidt } 50372f232036SJan Schmidt 50382f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 50392f232036SJan Schmidt ret = -EFAULT; 50402f232036SJan Schmidt 50412f232036SJan Schmidt kfree(qsa); 50422f232036SJan Schmidt return ret; 50432f232036SJan Schmidt } 50442f232036SJan Schmidt 504557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 504657254b6eSJan Schmidt { 504754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 504857254b6eSJan Schmidt 504957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 505057254b6eSJan Schmidt return -EPERM; 505157254b6eSJan Schmidt 505257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 505357254b6eSJan Schmidt } 505457254b6eSJan Schmidt 5055abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 5056abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 50578ea05e3aSAlexander Block { 5058496ad9aaSAl Viro struct inode *inode = file_inode(file); 50598ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 50608ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 50618ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 50628ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 50638ea05e3aSAlexander Block int ret = 0; 5064dd5f9615SStefan Behrens int received_uuid_changed; 50658ea05e3aSAlexander Block 5066bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 5067bd60ea0fSDavid Sterba return -EPERM; 5068bd60ea0fSDavid Sterba 50698ea05e3aSAlexander Block ret = mnt_want_write_file(file); 50708ea05e3aSAlexander Block if (ret < 0) 50718ea05e3aSAlexander Block return ret; 50728ea05e3aSAlexander Block 50738ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 50748ea05e3aSAlexander Block 50758ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 50768ea05e3aSAlexander Block ret = -EINVAL; 50778ea05e3aSAlexander Block goto out; 50788ea05e3aSAlexander Block } 50798ea05e3aSAlexander Block 50808ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 50818ea05e3aSAlexander Block ret = -EROFS; 50828ea05e3aSAlexander Block goto out; 50838ea05e3aSAlexander Block } 50848ea05e3aSAlexander Block 5085dd5f9615SStefan Behrens /* 5086dd5f9615SStefan Behrens * 1 - root item 5087dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 5088dd5f9615SStefan Behrens */ 5089dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 50908ea05e3aSAlexander Block if (IS_ERR(trans)) { 50918ea05e3aSAlexander Block ret = PTR_ERR(trans); 50928ea05e3aSAlexander Block trans = NULL; 50938ea05e3aSAlexander Block goto out; 50948ea05e3aSAlexander Block } 50958ea05e3aSAlexander Block 50968ea05e3aSAlexander Block sa->rtransid = trans->transid; 50978ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 50988ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 50998ea05e3aSAlexander Block 5100dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 5101dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 5102dd5f9615SStefan Behrens if (received_uuid_changed && 5103dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 5104dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 5105dd5f9615SStefan Behrens root_item->received_uuid, 5106dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5107dd5f9615SStefan Behrens root->root_key.objectid); 51088ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 51098ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 51108ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 51113cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 51123cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 51133cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 51143cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 51158ea05e3aSAlexander Block 51168ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 51178ea05e3aSAlexander Block &root->root_key, &root->root_item); 51188ea05e3aSAlexander Block if (ret < 0) { 51198ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 51208ea05e3aSAlexander Block goto out; 5121dd5f9615SStefan Behrens } 5122dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 5123dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 5124dd5f9615SStefan Behrens sa->uuid, 5125dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5126dd5f9615SStefan Behrens root->root_key.objectid); 5127dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 5128dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 5129dd5f9615SStefan Behrens goto out; 5130dd5f9615SStefan Behrens } 5131dd5f9615SStefan Behrens } 51328ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 5133dd5f9615SStefan Behrens if (ret < 0) { 5134dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 51358ea05e3aSAlexander Block goto out; 51368ea05e3aSAlexander Block } 51378ea05e3aSAlexander Block 5138abccd00fSHugo Mills out: 5139abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 5140abccd00fSHugo Mills mnt_drop_write_file(file); 5141abccd00fSHugo Mills return ret; 5142abccd00fSHugo Mills } 5143abccd00fSHugo Mills 5144abccd00fSHugo Mills #ifdef CONFIG_64BIT 5145abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 5146abccd00fSHugo Mills void __user *arg) 5147abccd00fSHugo Mills { 5148abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 5149abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 5150abccd00fSHugo Mills int ret = 0; 5151abccd00fSHugo Mills 5152abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 5153abccd00fSHugo Mills if (IS_ERR(args32)) { 5154abccd00fSHugo Mills ret = PTR_ERR(args32); 5155abccd00fSHugo Mills args32 = NULL; 5156abccd00fSHugo Mills goto out; 5157abccd00fSHugo Mills } 5158abccd00fSHugo Mills 5159abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 516084dbeb87SDan Carpenter if (!args64) { 516184dbeb87SDan Carpenter ret = -ENOMEM; 5162abccd00fSHugo Mills goto out; 5163abccd00fSHugo Mills } 5164abccd00fSHugo Mills 5165abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 5166abccd00fSHugo Mills args64->stransid = args32->stransid; 5167abccd00fSHugo Mills args64->rtransid = args32->rtransid; 5168abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 5169abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 5170abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 5171abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 5172abccd00fSHugo Mills args64->flags = args32->flags; 5173abccd00fSHugo Mills 5174abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 5175abccd00fSHugo Mills if (ret) 5176abccd00fSHugo Mills goto out; 5177abccd00fSHugo Mills 5178abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 5179abccd00fSHugo Mills args32->stransid = args64->stransid; 5180abccd00fSHugo Mills args32->rtransid = args64->rtransid; 5181abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 5182abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 5183abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 5184abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 5185abccd00fSHugo Mills args32->flags = args64->flags; 5186abccd00fSHugo Mills 5187abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 5188abccd00fSHugo Mills if (ret) 5189abccd00fSHugo Mills ret = -EFAULT; 5190abccd00fSHugo Mills 5191abccd00fSHugo Mills out: 5192abccd00fSHugo Mills kfree(args32); 5193abccd00fSHugo Mills kfree(args64); 5194abccd00fSHugo Mills return ret; 5195abccd00fSHugo Mills } 5196abccd00fSHugo Mills #endif 5197abccd00fSHugo Mills 5198abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 5199abccd00fSHugo Mills void __user *arg) 5200abccd00fSHugo Mills { 5201abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 5202abccd00fSHugo Mills int ret = 0; 5203abccd00fSHugo Mills 5204abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 5205abccd00fSHugo Mills if (IS_ERR(sa)) { 5206abccd00fSHugo Mills ret = PTR_ERR(sa); 5207abccd00fSHugo Mills sa = NULL; 5208abccd00fSHugo Mills goto out; 5209abccd00fSHugo Mills } 5210abccd00fSHugo Mills 5211abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 5212abccd00fSHugo Mills 5213abccd00fSHugo Mills if (ret) 5214abccd00fSHugo Mills goto out; 5215abccd00fSHugo Mills 52168ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 52178ea05e3aSAlexander Block if (ret) 52188ea05e3aSAlexander Block ret = -EFAULT; 52198ea05e3aSAlexander Block 52208ea05e3aSAlexander Block out: 52218ea05e3aSAlexander Block kfree(sa); 52228ea05e3aSAlexander Block return ret; 52238ea05e3aSAlexander Block } 52248ea05e3aSAlexander Block 5225867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 5226867ab667Sjeff.liu { 52276d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5228a1b83ac5SAnand Jain size_t len; 5229867ab667Sjeff.liu int ret; 5230a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5231a1b83ac5SAnand Jain 5232a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5233a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 5234a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5235a1b83ac5SAnand Jain 5236a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5237867ab667Sjeff.liu 5238867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 5239efe120a0SFrank Holton btrfs_warn(root->fs_info, 5240efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5241867ab667Sjeff.liu } 5242867ab667Sjeff.liu 5243867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5244867ab667Sjeff.liu 5245867ab667Sjeff.liu return ret ? -EFAULT : 0; 5246867ab667Sjeff.liu } 5247867ab667Sjeff.liu 5248a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5249a8bfd4abSjeff.liu { 52506d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5251a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5252a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5253a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5254a8bfd4abSjeff.liu int ret; 5255a8bfd4abSjeff.liu 5256a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5257a8bfd4abSjeff.liu return -EPERM; 5258a8bfd4abSjeff.liu 5259a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5260a8bfd4abSjeff.liu return -EFAULT; 5261a8bfd4abSjeff.liu 5262a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5263efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5264a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5265a8bfd4abSjeff.liu return -EINVAL; 5266a8bfd4abSjeff.liu } 5267a8bfd4abSjeff.liu 5268a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5269a8bfd4abSjeff.liu if (ret) 5270a8bfd4abSjeff.liu return ret; 5271a8bfd4abSjeff.liu 5272a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5273a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5274a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5275a8bfd4abSjeff.liu goto out_unlock; 5276a8bfd4abSjeff.liu } 5277a8bfd4abSjeff.liu 5278a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5279a8bfd4abSjeff.liu strcpy(super_block->label, label); 5280a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5281d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5282a8bfd4abSjeff.liu 5283a8bfd4abSjeff.liu out_unlock: 5284a8bfd4abSjeff.liu mnt_drop_write_file(file); 5285a8bfd4abSjeff.liu return ret; 5286a8bfd4abSjeff.liu } 5287a8bfd4abSjeff.liu 52882eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 52892eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 52902eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 52912eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 52922eaa055fSJeff Mahoney 52932eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 52942eaa055fSJeff Mahoney void __user *arg) 52952eaa055fSJeff Mahoney { 52964d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 52972eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 52982eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 52992eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 53002eaa055fSJeff Mahoney }; 53012eaa055fSJeff Mahoney 53022eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 53032eaa055fSJeff Mahoney return -EFAULT; 53042eaa055fSJeff Mahoney 53052eaa055fSJeff Mahoney return 0; 53062eaa055fSJeff Mahoney } 53072eaa055fSJeff Mahoney 53082eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 53092eaa055fSJeff Mahoney { 53102eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 53112eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 53122eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 53132eaa055fSJeff Mahoney 53142eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 53152eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 53162eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 53172eaa055fSJeff Mahoney 53182eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 53192eaa055fSJeff Mahoney return -EFAULT; 53202eaa055fSJeff Mahoney 53212eaa055fSJeff Mahoney return 0; 53222eaa055fSJeff Mahoney } 53232eaa055fSJeff Mahoney 53243b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 53253b02a68aSJeff Mahoney enum btrfs_feature_set set, 53262eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 53272eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 53282eaa055fSJeff Mahoney { 53293b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 53303b02a68aSJeff Mahoney char *names; 53312eaa055fSJeff Mahoney u64 disallowed, unsupported; 53322eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 53332eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 53342eaa055fSJeff Mahoney 53352eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 53362eaa055fSJeff Mahoney if (unsupported) { 53373b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 53383b02a68aSJeff Mahoney if (names) { 53393b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53403b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 53413b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53423b02a68aSJeff Mahoney kfree(names); 53433b02a68aSJeff Mahoney } else 53442eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53452eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 53462eaa055fSJeff Mahoney type, unsupported); 53472eaa055fSJeff Mahoney return -EOPNOTSUPP; 53482eaa055fSJeff Mahoney } 53492eaa055fSJeff Mahoney 53502eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 53512eaa055fSJeff Mahoney if (disallowed) { 53523b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 53533b02a68aSJeff Mahoney if (names) { 53543b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53553b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 53563b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53573b02a68aSJeff Mahoney kfree(names); 53583b02a68aSJeff Mahoney } else 53592eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53602eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 53612eaa055fSJeff Mahoney type, disallowed); 53622eaa055fSJeff Mahoney return -EPERM; 53632eaa055fSJeff Mahoney } 53642eaa055fSJeff Mahoney 53652eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 53662eaa055fSJeff Mahoney if (disallowed) { 53673b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 53683b02a68aSJeff Mahoney if (names) { 53693b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53703b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 53713b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53723b02a68aSJeff Mahoney kfree(names); 53733b02a68aSJeff Mahoney } else 53742eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53752eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 53762eaa055fSJeff Mahoney type, disallowed); 53772eaa055fSJeff Mahoney return -EPERM; 53782eaa055fSJeff Mahoney } 53792eaa055fSJeff Mahoney 53802eaa055fSJeff Mahoney return 0; 53812eaa055fSJeff Mahoney } 53822eaa055fSJeff Mahoney 53832eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 53843b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 53852eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 53862eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 53872eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 53882eaa055fSJeff Mahoney 53892eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 53902eaa055fSJeff Mahoney { 53912eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 53922eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 53932eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 53942eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 53952eaa055fSJeff Mahoney u64 newflags; 53962eaa055fSJeff Mahoney int ret; 53972eaa055fSJeff Mahoney 53982eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 53992eaa055fSJeff Mahoney return -EPERM; 54002eaa055fSJeff Mahoney 54012eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 54022eaa055fSJeff Mahoney return -EFAULT; 54032eaa055fSJeff Mahoney 54042eaa055fSJeff Mahoney /* Nothing to do */ 54052eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 54062eaa055fSJeff Mahoney !flags[0].incompat_flags) 54072eaa055fSJeff Mahoney return 0; 54082eaa055fSJeff Mahoney 54092eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 54102eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 54112eaa055fSJeff Mahoney if (ret) 54122eaa055fSJeff Mahoney return ret; 54132eaa055fSJeff Mahoney 54142eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 54152eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 54162eaa055fSJeff Mahoney if (ret) 54172eaa055fSJeff Mahoney return ret; 54182eaa055fSJeff Mahoney 54192eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 54202eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 54212eaa055fSJeff Mahoney if (ret) 54222eaa055fSJeff Mahoney return ret; 54232eaa055fSJeff Mahoney 54248051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 54252eaa055fSJeff Mahoney if (IS_ERR(trans)) 54262eaa055fSJeff Mahoney return PTR_ERR(trans); 54272eaa055fSJeff Mahoney 54282eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 54292eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 54302eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 54312eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 54322eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 54332eaa055fSJeff Mahoney 54342eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 54352eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 54362eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 54372eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 54382eaa055fSJeff Mahoney 54392eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 54402eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 54412eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 54422eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 54432eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 54442eaa055fSJeff Mahoney 5445d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 54462eaa055fSJeff Mahoney } 54472eaa055fSJeff Mahoney 5448f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5449f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5450f46b5a66SChristoph Hellwig { 5451496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 54524bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5453f46b5a66SChristoph Hellwig 5454f46b5a66SChristoph Hellwig switch (cmd) { 54556cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 54566cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 54576cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 54586cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 54596cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 54606cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5461f7039b1dSLi Dongyang case FITRIM: 5462f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5463f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5464fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5465fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5466fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54673de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5468fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54696f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54706f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 547176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 547276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 54730caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54740caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 54750caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54760caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54776ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54786ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5479f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54801e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54811e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54821e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5483f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5484198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5485f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54864bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5487f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5488da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5489475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5490475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5491475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5492475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5493f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 54949ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5495f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 5496c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 5497c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 54987a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 5499f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5500f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5501f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5502f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5503ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5504ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5505cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5506cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5507ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5508ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5509d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5510d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5511d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5512d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 55131406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 55141406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 55159b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 55169b199859SFilipe David Borba Manana int ret; 55179b199859SFilipe David Borba Manana 55186c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 55199b199859SFilipe David Borba Manana if (ret) 55209b199859SFilipe David Borba Manana return ret; 5521ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 55222fad4e83SDavid Sterba /* 55232fad4e83SDavid Sterba * The transaction thread may want to do more work, 55242fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 55252fad4e83SDavid Sterba * processing uncleaned subvols. 55262fad4e83SDavid Sterba */ 55272fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 55289b199859SFilipe David Borba Manana return ret; 55299b199859SFilipe David Borba Manana } 553046204592SSage Weil case BTRFS_IOC_START_SYNC: 55319a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 553246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 55339a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5534475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5535b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5536475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5537475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5538475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5539475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5540c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 55419ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5542837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5543837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 554419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 554519a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 55468ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55478ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5548abccd00fSHugo Mills #ifdef CONFIG_64BIT 5549abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5550abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5551abccd00fSHugo Mills #endif 555231db9f7cSAlexander Block case BTRFS_IOC_SEND: 555331db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5554c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5555b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 55565d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5557905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55585d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5559905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55605d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5561905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55625d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5563905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55642f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55652f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55662f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 55672f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 556857254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 556957254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 55703f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55713f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5572867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5573867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5574a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5575a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5576416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5577416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 55782eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 55792eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 55802eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 55812eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 55822eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55832eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5584f46b5a66SChristoph Hellwig } 5585f46b5a66SChristoph Hellwig 5586f46b5a66SChristoph Hellwig return -ENOTTY; 5587f46b5a66SChristoph Hellwig } 5588