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 2435955102cSAl Viro inode_lock(inode); 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: 3615955102cSAl Viro inode_unlock(inode); 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 571f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 572f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 573f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 574f32e48e9SChandan Rajendra 575f46b5a66SChristoph Hellwig /* 576f46b5a66SChristoph Hellwig * insert the directory item 577f46b5a66SChristoph Hellwig */ 5783de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 57979787eaaSJeff Mahoney if (ret) { 58079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 58179787eaaSJeff Mahoney goto fail; 58279787eaaSJeff Mahoney } 5833de4586cSChris Mason 5843de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 58516cdcec7SMiao Xie name, namelen, dir, &key, 5863de4586cSChris Mason BTRFS_FT_DIR, index); 58779787eaaSJeff Mahoney if (ret) { 58879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 589f46b5a66SChristoph Hellwig goto fail; 59079787eaaSJeff Mahoney } 5910660b5afSChris Mason 59252c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 59352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 59452c26179SYan Zheng BUG_ON(ret); 59552c26179SYan Zheng 5960660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5974df27c4dSYan, Zheng objectid, root->root_key.objectid, 59833345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5990660b5afSChris Mason BUG_ON(ret); 6000660b5afSChris Mason 601dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 602dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 603dd5f9615SStefan Behrens objectid); 604dd5f9615SStefan Behrens if (ret) 605dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 606dd5f9615SStefan Behrens 607f46b5a66SChristoph Hellwig fail: 608d5c12070SMiao Xie trans->block_rsv = NULL; 609d5c12070SMiao Xie trans->bytes_reserved = 0; 610de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 611de6e8200SLiu Bo 61272fd032eSSage Weil if (async_transid) { 61372fd032eSSage Weil *async_transid = trans->transid; 61472fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 61500d71c9cSMiao Xie if (err) 61600d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 61772fd032eSSage Weil } else { 61876dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 61972fd032eSSage Weil } 620f46b5a66SChristoph Hellwig if (err && !ret) 621f46b5a66SChristoph Hellwig ret = err; 6221a65e24bSChris Mason 6235662344bSTsutomu Itoh if (!ret) { 6245662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 625de6e8200SLiu Bo if (IS_ERR(inode)) 626de6e8200SLiu Bo return PTR_ERR(inode); 6275662344bSTsutomu Itoh d_instantiate(dentry, inode); 6285662344bSTsutomu Itoh } 629f46b5a66SChristoph Hellwig return ret; 630f46b5a66SChristoph Hellwig } 631f46b5a66SChristoph Hellwig 6329ea24bbeSFilipe Manana static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) 6338257b2dcSMiao Xie { 6348257b2dcSMiao Xie s64 writers; 6358257b2dcSMiao Xie DEFINE_WAIT(wait); 6368257b2dcSMiao Xie 6378257b2dcSMiao Xie do { 6388257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6398257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6408257b2dcSMiao Xie 6418257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6428257b2dcSMiao Xie if (writers) 6438257b2dcSMiao Xie schedule(); 6448257b2dcSMiao Xie 6458257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6468257b2dcSMiao Xie } while (writers); 6478257b2dcSMiao Xie } 6488257b2dcSMiao Xie 649e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 650e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 651e9662f70SMiao Xie u64 *async_transid, bool readonly, 652e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 653f46b5a66SChristoph Hellwig { 6542e4bfab9SYan, Zheng struct inode *inode; 655f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 656f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6572e4bfab9SYan, Zheng int ret; 658f46b5a66SChristoph Hellwig 65927cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 660f46b5a66SChristoph Hellwig return -EINVAL; 661f46b5a66SChristoph Hellwig 662a1ee7362SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 663a1ee7362SDavid Sterba if (!pending_snapshot) 664a1ee7362SDavid Sterba return -ENOMEM; 665a1ee7362SDavid Sterba 666b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 667b0c0ea63SDavid Sterba GFP_NOFS); 6688546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 6698546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 670b0c0ea63SDavid Sterba ret = -ENOMEM; 671b0c0ea63SDavid Sterba goto free_pending; 672b0c0ea63SDavid Sterba } 673b0c0ea63SDavid Sterba 6748257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6754e857c58SPeter Zijlstra smp_mb__after_atomic(); 6769ea24bbeSFilipe Manana btrfs_wait_for_no_snapshoting_writes(root); 6778257b2dcSMiao Xie 6786a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6796a03843dSMiao Xie if (ret) 680a1ee7362SDavid Sterba goto dec_and_free; 6816a03843dSMiao Xie 682b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6836a03843dSMiao Xie 68466d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 68566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 686d5c12070SMiao Xie /* 687d5c12070SMiao Xie * 1 - parent dir inode 688d5c12070SMiao Xie * 2 - dir entries 689d5c12070SMiao Xie * 1 - root item 690d5c12070SMiao Xie * 2 - root ref/backref 691d5c12070SMiao Xie * 1 - root of snapshot 692dd5f9615SStefan Behrens * 1 - UUID item 693d5c12070SMiao Xie */ 694d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 695dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 696ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 697ee3441b4SJeff Mahoney false); 698d5c12070SMiao Xie if (ret) 699a1ee7362SDavid Sterba goto dec_and_free; 700d5c12070SMiao Xie 701a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 702a22285a6SYan, Zheng pending_snapshot->root = root; 703b83cc969SLi Zefan pending_snapshot->readonly = readonly; 704e9662f70SMiao Xie pending_snapshot->dir = dir; 7058696c533SMiao Xie pending_snapshot->inherit = inherit; 706a22285a6SYan, Zheng 707d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 708a22285a6SYan, Zheng if (IS_ERR(trans)) { 709a22285a6SYan, Zheng ret = PTR_ERR(trans); 710a22285a6SYan, Zheng goto fail; 711a22285a6SYan, Zheng } 712a22285a6SYan, Zheng 7138351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 714a22285a6SYan, Zheng list_add(&pending_snapshot->list, 715a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7168351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 71772fd032eSSage Weil if (async_transid) { 71872fd032eSSage Weil *async_transid = trans->transid; 71972fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 72072fd032eSSage Weil root->fs_info->extent_root, 1); 72100d71c9cSMiao Xie if (ret) 72200d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 72372fd032eSSage Weil } else { 72472fd032eSSage Weil ret = btrfs_commit_transaction(trans, 72572fd032eSSage Weil root->fs_info->extent_root); 72672fd032eSSage Weil } 727aec8030aSMiao Xie if (ret) 728c37b2b62SJosef Bacik goto fail; 729a22285a6SYan, Zheng 730a22285a6SYan, Zheng ret = pending_snapshot->error; 731f46b5a66SChristoph Hellwig if (ret) 7322e4bfab9SYan, Zheng goto fail; 733f46b5a66SChristoph Hellwig 734d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 735d3797308SChris Mason if (ret) 736d3797308SChris Mason goto fail; 737d3797308SChris Mason 7382b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7392e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7402e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7412e4bfab9SYan, Zheng goto fail; 7422e4bfab9SYan, Zheng } 7435662344bSTsutomu Itoh 7442e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7452e4bfab9SYan, Zheng ret = 0; 7462e4bfab9SYan, Zheng fail: 747d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 748d5c12070SMiao Xie &pending_snapshot->block_rsv, 749d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 750a1ee7362SDavid Sterba dec_and_free: 7519ea24bbeSFilipe Manana if (atomic_dec_and_test(&root->will_be_snapshoted)) 7529ea24bbeSFilipe Manana wake_up_atomic_t(&root->will_be_snapshoted); 753b0c0ea63SDavid Sterba free_pending: 754b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 7558546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 756a1ee7362SDavid Sterba kfree(pending_snapshot); 757a1ee7362SDavid Sterba 758f46b5a66SChristoph Hellwig return ret; 759f46b5a66SChristoph Hellwig } 760f46b5a66SChristoph Hellwig 7614260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7624260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7634260f7c7SSage Weil * whether the type of victim is right. 7644260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7654260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7664260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7674260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7684260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7694260f7c7SSage Weil * a. be owner of dir, or 7704260f7c7SSage Weil * b. be owner of victim, or 7714260f7c7SSage Weil * c. have CAP_FOWNER capability 7724260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7734260f7c7SSage Weil * links pointing to it. 7744260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7754260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7764260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7774260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7784260f7c7SSage Weil * nfs_async_unlink(). 7794260f7c7SSage Weil */ 7804260f7c7SSage Weil 7814260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7824260f7c7SSage Weil { 7834260f7c7SSage Weil int error; 7844260f7c7SSage Weil 7852b0143b5SDavid Howells if (d_really_is_negative(victim)) 7864260f7c7SSage Weil return -ENOENT; 7874260f7c7SSage Weil 7882b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 7894fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7904260f7c7SSage Weil 7914260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7924260f7c7SSage Weil if (error) 7934260f7c7SSage Weil return error; 7944260f7c7SSage Weil if (IS_APPEND(dir)) 7954260f7c7SSage Weil return -EPERM; 7962b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 7972b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 7984260f7c7SSage Weil return -EPERM; 7994260f7c7SSage Weil if (isdir) { 800e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8014260f7c7SSage Weil return -ENOTDIR; 8024260f7c7SSage Weil if (IS_ROOT(victim)) 8034260f7c7SSage Weil return -EBUSY; 804e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8054260f7c7SSage Weil return -EISDIR; 8064260f7c7SSage Weil if (IS_DEADDIR(dir)) 8074260f7c7SSage Weil return -ENOENT; 8084260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8094260f7c7SSage Weil return -EBUSY; 8104260f7c7SSage Weil return 0; 8114260f7c7SSage Weil } 8124260f7c7SSage Weil 813cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 814cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 815cb8e7090SChristoph Hellwig { 8162b0143b5SDavid Howells if (d_really_is_positive(child)) 817cb8e7090SChristoph Hellwig return -EEXIST; 818cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 819cb8e7090SChristoph Hellwig return -ENOENT; 820cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 821cb8e7090SChristoph Hellwig } 822cb8e7090SChristoph Hellwig 823cb8e7090SChristoph Hellwig /* 824cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 825cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 826cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 827cb8e7090SChristoph Hellwig */ 82876dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 82976dda93cSYan, Zheng char *name, int namelen, 83072fd032eSSage Weil struct btrfs_root *snap_src, 8316f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8328696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 833cb8e7090SChristoph Hellwig { 8342b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 835cb8e7090SChristoph Hellwig struct dentry *dentry; 836cb8e7090SChristoph Hellwig int error; 837cb8e7090SChristoph Hellwig 8385c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8395c50c9b8SDavid Sterba if (error == -EINTR) 8405c50c9b8SDavid Sterba return error; 841cb8e7090SChristoph Hellwig 842cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 843cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 844cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 845cb8e7090SChristoph Hellwig goto out_unlock; 846cb8e7090SChristoph Hellwig 847cb8e7090SChristoph Hellwig error = -EEXIST; 8482b0143b5SDavid Howells if (d_really_is_positive(dentry)) 849cb8e7090SChristoph Hellwig goto out_dput; 850cb8e7090SChristoph Hellwig 85176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 852cb8e7090SChristoph Hellwig if (error) 853a874a63eSLiu Bo goto out_dput; 854cb8e7090SChristoph Hellwig 8559c52057cSChris Mason /* 8569c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8579c52057cSChris Mason * check for them now when we can safely fail 8589c52057cSChris Mason */ 8599c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8609c52057cSChris Mason dir->i_ino, name, 8619c52057cSChris Mason namelen); 8629c52057cSChris Mason if (error) 8639c52057cSChris Mason goto out_dput; 8649c52057cSChris Mason 86576dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 86676dda93cSYan, Zheng 86776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 86876dda93cSYan, Zheng goto out_up_read; 86976dda93cSYan, Zheng 8703de4586cSChris Mason if (snap_src) { 871e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8726f72c7e2SArne Jansen async_transid, readonly, inherit); 8733de4586cSChris Mason } else { 874d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 875d5c12070SMiao Xie async_transid, inherit); 8763de4586cSChris Mason } 87776dda93cSYan, Zheng if (!error) 87876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 87976dda93cSYan, Zheng out_up_read: 88076dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 881cb8e7090SChristoph Hellwig out_dput: 882cb8e7090SChristoph Hellwig dput(dentry); 883cb8e7090SChristoph Hellwig out_unlock: 8845955102cSAl Viro inode_unlock(dir); 885cb8e7090SChristoph Hellwig return error; 886cb8e7090SChristoph Hellwig } 887cb8e7090SChristoph Hellwig 8884cb5300bSChris Mason /* 8894cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8904cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8914cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8924cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8934cb5300bSChris Mason * part of the file 8944cb5300bSChris Mason */ 895aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 8964cb5300bSChris Mason { 8974cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8984cb5300bSChris Mason struct extent_map *em = NULL; 8994cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 9004cb5300bSChris Mason u64 end; 9014cb5300bSChris Mason 9024cb5300bSChris Mason read_lock(&em_tree->lock); 9034cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 9044cb5300bSChris Mason read_unlock(&em_tree->lock); 9054cb5300bSChris Mason 9064cb5300bSChris Mason if (em) { 9074cb5300bSChris Mason end = extent_map_end(em); 9084cb5300bSChris Mason free_extent_map(em); 9094cb5300bSChris Mason if (end - offset > thresh) 9104cb5300bSChris Mason return 0; 9114cb5300bSChris Mason } 9124cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9134cb5300bSChris Mason thresh /= 2; 9144cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9154cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9164cb5300bSChris Mason if (end >= thresh) 9174cb5300bSChris Mason return 0; 9184cb5300bSChris Mason return 1; 9194cb5300bSChris Mason } 9204cb5300bSChris Mason 9214cb5300bSChris Mason /* 9224cb5300bSChris Mason * helper function to walk through a file and find extents 9234cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9244cb5300bSChris Mason * 9254cb5300bSChris Mason * This is used by the defragging code to find new and small 9264cb5300bSChris Mason * extents 9274cb5300bSChris Mason */ 9284cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9294cb5300bSChris Mason struct inode *inode, u64 newer_than, 930aab110abSDavid Sterba u64 *off, u32 thresh) 9314cb5300bSChris Mason { 9324cb5300bSChris Mason struct btrfs_path *path; 9334cb5300bSChris Mason struct btrfs_key min_key; 9344cb5300bSChris Mason struct extent_buffer *leaf; 9354cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9364cb5300bSChris Mason int type; 9374cb5300bSChris Mason int ret; 938a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9394cb5300bSChris Mason 9404cb5300bSChris Mason path = btrfs_alloc_path(); 9414cb5300bSChris Mason if (!path) 9424cb5300bSChris Mason return -ENOMEM; 9434cb5300bSChris Mason 944a4689d2bSDavid Sterba min_key.objectid = ino; 9454cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9464cb5300bSChris Mason min_key.offset = *off; 9474cb5300bSChris Mason 9484cb5300bSChris Mason while (1) { 9496174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9504cb5300bSChris Mason if (ret != 0) 9514cb5300bSChris Mason goto none; 952f094c9bdSFilipe Manana process_slot: 953a4689d2bSDavid Sterba if (min_key.objectid != ino) 9544cb5300bSChris Mason goto none; 9554cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9564cb5300bSChris Mason goto none; 9574cb5300bSChris Mason 9584cb5300bSChris Mason leaf = path->nodes[0]; 9594cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9604cb5300bSChris Mason struct btrfs_file_extent_item); 9614cb5300bSChris Mason 9624cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9634cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9644cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9654cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9664cb5300bSChris Mason *off = min_key.offset; 9674cb5300bSChris Mason btrfs_free_path(path); 9684cb5300bSChris Mason return 0; 9694cb5300bSChris Mason } 9704cb5300bSChris Mason 971f094c9bdSFilipe Manana path->slots[0]++; 972f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 973f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 974f094c9bdSFilipe Manana goto process_slot; 975f094c9bdSFilipe Manana } 976f094c9bdSFilipe Manana 9774cb5300bSChris Mason if (min_key.offset == (u64)-1) 9784cb5300bSChris Mason goto none; 9794cb5300bSChris Mason 9804cb5300bSChris Mason min_key.offset++; 9814cb5300bSChris Mason btrfs_release_path(path); 9824cb5300bSChris Mason } 9834cb5300bSChris Mason none: 9844cb5300bSChris Mason btrfs_free_path(path); 9854cb5300bSChris Mason return -ENOENT; 9864cb5300bSChris Mason } 9874cb5300bSChris Mason 9886c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98917ce6ef8SLiu Bo { 99017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 991940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9926c282eb4SLi Zefan struct extent_map *em; 9936c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 994940100a4SChris Mason 995940100a4SChris Mason /* 996940100a4SChris Mason * hopefully we have this extent in the tree already, try without 997940100a4SChris Mason * the full extent lock 998940100a4SChris Mason */ 999940100a4SChris Mason read_lock(&em_tree->lock); 1000940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1001940100a4SChris Mason read_unlock(&em_tree->lock); 1002940100a4SChris Mason 1003940100a4SChris Mason if (!em) { 1004308d9800SFilipe Manana struct extent_state *cached = NULL; 1005308d9800SFilipe Manana u64 end = start + len - 1; 1006308d9800SFilipe Manana 1007940100a4SChris Mason /* get the big lock and read metadata off disk */ 1008ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1009940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1010308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1011940100a4SChris Mason 10126cf8bfbfSDan Carpenter if (IS_ERR(em)) 10136c282eb4SLi Zefan return NULL; 1014940100a4SChris Mason } 1015940100a4SChris Mason 10166c282eb4SLi Zefan return em; 10176c282eb4SLi Zefan } 10186c282eb4SLi Zefan 10196c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10206c282eb4SLi Zefan { 10216c282eb4SLi Zefan struct extent_map *next; 10226c282eb4SLi Zefan bool ret = true; 10236c282eb4SLi Zefan 10246c282eb4SLi Zefan /* this is the last extent */ 10256c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10266c282eb4SLi Zefan return false; 10276c282eb4SLi Zefan 10286c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1029e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1030e9512d72SChris Mason ret = false; 1031e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1032ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 10336c282eb4SLi Zefan ret = false; 10346c282eb4SLi Zefan 10356c282eb4SLi Zefan free_extent_map(next); 10366c282eb4SLi Zefan return ret; 10376c282eb4SLi Zefan } 10386c282eb4SLi Zefan 1039aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1040a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1041a43a2111SAndrew Mahone int compress) 10426c282eb4SLi Zefan { 10436c282eb4SLi Zefan struct extent_map *em; 10446c282eb4SLi Zefan int ret = 1; 10456c282eb4SLi Zefan bool next_mergeable = true; 10464a3560c4SLiu Bo bool prev_mergeable = true; 10476c282eb4SLi Zefan 10486c282eb4SLi Zefan /* 10496c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10506c282eb4SLi Zefan * defragging it 10516c282eb4SLi Zefan */ 10526c282eb4SLi Zefan if (start < *defrag_end) 10536c282eb4SLi Zefan return 1; 10546c282eb4SLi Zefan 10556c282eb4SLi Zefan *skip = 0; 10566c282eb4SLi Zefan 10576c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10586c282eb4SLi Zefan if (!em) 10596c282eb4SLi Zefan return 0; 10606c282eb4SLi Zefan 1061940100a4SChris Mason /* this will cover holes, and inline extents */ 106217ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1063940100a4SChris Mason ret = 0; 106417ce6ef8SLiu Bo goto out; 106517ce6ef8SLiu Bo } 106617ce6ef8SLiu Bo 10674a3560c4SLiu Bo if (!*defrag_end) 10684a3560c4SLiu Bo prev_mergeable = false; 10694a3560c4SLiu Bo 10706c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1071940100a4SChris Mason /* 10726c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10736c282eb4SLi Zefan * real extent, don't bother defragging it 1074940100a4SChris Mason */ 1075a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10764a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1077940100a4SChris Mason ret = 0; 107817ce6ef8SLiu Bo out: 1079940100a4SChris Mason /* 1080940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1081940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1082940100a4SChris Mason * so that the next tiny extent will force a defrag. 1083940100a4SChris Mason * 1084940100a4SChris Mason * The end result of this is that tiny extents before a single big 1085940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1086940100a4SChris Mason */ 1087940100a4SChris Mason if (ret) { 1088940100a4SChris Mason *defrag_end = extent_map_end(em); 1089940100a4SChris Mason } else { 1090940100a4SChris Mason *last_len = 0; 1091940100a4SChris Mason *skip = extent_map_end(em); 1092940100a4SChris Mason *defrag_end = 0; 1093940100a4SChris Mason } 1094940100a4SChris Mason 1095940100a4SChris Mason free_extent_map(em); 1096940100a4SChris Mason return ret; 1097940100a4SChris Mason } 1098940100a4SChris Mason 10994cb5300bSChris Mason /* 11004cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 11014cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 11024cb5300bSChris Mason * to COW and defrag. 11034cb5300bSChris Mason * 11044cb5300bSChris Mason * It also makes sure the delalloc code has enough 11054cb5300bSChris Mason * dirty data to avoid making new small extents as part 11064cb5300bSChris Mason * of the defrag 11074cb5300bSChris Mason * 11084cb5300bSChris Mason * It's a good idea to start RA on this range 11094cb5300bSChris Mason * before calling this. 11104cb5300bSChris Mason */ 11114cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11124cb5300bSChris Mason struct page **pages, 11134cb5300bSChris Mason unsigned long start_index, 1114c41570c9SJustin Maggard unsigned long num_pages) 1115f46b5a66SChristoph Hellwig { 11164cb5300bSChris Mason unsigned long file_end; 11174cb5300bSChris Mason u64 isize = i_size_read(inode); 1118f46b5a66SChristoph Hellwig u64 page_start; 1119f46b5a66SChristoph Hellwig u64 page_end; 11201f12bd06SLiu Bo u64 page_cnt; 11214cb5300bSChris Mason int ret; 11224cb5300bSChris Mason int i; 11234cb5300bSChris Mason int i_done; 11244cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11254cb5300bSChris Mason struct extent_state *cached_state = NULL; 1126600a45e1SMiao Xie struct extent_io_tree *tree; 11273b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11284cb5300bSChris Mason 11294cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11301f12bd06SLiu Bo if (!isize || start_index > file_end) 11311f12bd06SLiu Bo return 0; 11321f12bd06SLiu Bo 11331f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11344cb5300bSChris Mason 11354cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 1136df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 11371f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11384cb5300bSChris Mason if (ret) 11394cb5300bSChris Mason return ret; 11404cb5300bSChris Mason i_done = 0; 1141600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11424cb5300bSChris Mason 11434cb5300bSChris Mason /* step one, lock all the pages */ 11441f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11454cb5300bSChris Mason struct page *page; 1146600a45e1SMiao Xie again: 1147a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11483b16a4e3SJosef Bacik start_index + i, mask); 11494cb5300bSChris Mason if (!page) 11504cb5300bSChris Mason break; 11514cb5300bSChris Mason 1152600a45e1SMiao Xie page_start = page_offset(page); 1153600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1154600a45e1SMiao Xie while (1) { 1155308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1156ff13db41SDavid Sterba &cached_state); 1157600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1158600a45e1SMiao Xie page_start); 1159308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1160308d9800SFilipe Manana &cached_state, GFP_NOFS); 1161600a45e1SMiao Xie if (!ordered) 1162600a45e1SMiao Xie break; 1163600a45e1SMiao Xie 1164600a45e1SMiao Xie unlock_page(page); 1165600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1166600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1167600a45e1SMiao Xie lock_page(page); 11681f12bd06SLiu Bo /* 11691f12bd06SLiu Bo * we unlocked the page above, so we need check if 11701f12bd06SLiu Bo * it was released or not. 11711f12bd06SLiu Bo */ 11721f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11731f12bd06SLiu Bo unlock_page(page); 11741f12bd06SLiu Bo page_cache_release(page); 11751f12bd06SLiu Bo goto again; 11761f12bd06SLiu Bo } 1177600a45e1SMiao Xie } 1178600a45e1SMiao Xie 11794cb5300bSChris Mason if (!PageUptodate(page)) { 11804cb5300bSChris Mason btrfs_readpage(NULL, page); 11814cb5300bSChris Mason lock_page(page); 11824cb5300bSChris Mason if (!PageUptodate(page)) { 11834cb5300bSChris Mason unlock_page(page); 11844cb5300bSChris Mason page_cache_release(page); 11854cb5300bSChris Mason ret = -EIO; 11864cb5300bSChris Mason break; 11874cb5300bSChris Mason } 11884cb5300bSChris Mason } 1189600a45e1SMiao Xie 1190600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1191600a45e1SMiao Xie unlock_page(page); 1192600a45e1SMiao Xie page_cache_release(page); 1193600a45e1SMiao Xie goto again; 1194600a45e1SMiao Xie } 1195600a45e1SMiao Xie 11964cb5300bSChris Mason pages[i] = page; 11974cb5300bSChris Mason i_done++; 11984cb5300bSChris Mason } 11994cb5300bSChris Mason if (!i_done || ret) 12004cb5300bSChris Mason goto out; 12014cb5300bSChris Mason 12024cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12034cb5300bSChris Mason goto out; 12044cb5300bSChris Mason 12054cb5300bSChris Mason /* 12064cb5300bSChris Mason * so now we have a nice long stream of locked 12074cb5300bSChris Mason * and up to date pages, lets wait on them 12084cb5300bSChris Mason */ 12094cb5300bSChris Mason for (i = 0; i < i_done; i++) 12104cb5300bSChris Mason wait_on_page_writeback(pages[i]); 12114cb5300bSChris Mason 12124cb5300bSChris Mason page_start = page_offset(pages[0]); 12134cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12144cb5300bSChris Mason 12154cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1216ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 12174cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12184cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12199e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12209e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12214cb5300bSChris Mason 12221f12bd06SLiu Bo if (i_done != page_cnt) { 12239e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12249e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12259e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12264cb5300bSChris Mason btrfs_delalloc_release_space(inode, 1227df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 12281f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12294cb5300bSChris Mason } 12304cb5300bSChris Mason 12314cb5300bSChris Mason 12329e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12339e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12344cb5300bSChris Mason 12354cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12364cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12374cb5300bSChris Mason GFP_NOFS); 12384cb5300bSChris Mason 12394cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12404cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12414cb5300bSChris Mason ClearPageChecked(pages[i]); 12424cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12434cb5300bSChris Mason set_page_dirty(pages[i]); 12444cb5300bSChris Mason unlock_page(pages[i]); 12454cb5300bSChris Mason page_cache_release(pages[i]); 12464cb5300bSChris Mason } 12474cb5300bSChris Mason return i_done; 12484cb5300bSChris Mason out: 12494cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12504cb5300bSChris Mason unlock_page(pages[i]); 12514cb5300bSChris Mason page_cache_release(pages[i]); 12524cb5300bSChris Mason } 12537cf5b976SQu Wenruo btrfs_delalloc_release_space(inode, 1254df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 1255df480633SQu Wenruo page_cnt << PAGE_CACHE_SHIFT); 12564cb5300bSChris Mason return ret; 12574cb5300bSChris Mason 12584cb5300bSChris Mason } 12594cb5300bSChris Mason 12604cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12614cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12624cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12634cb5300bSChris Mason { 12644cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12654cb5300bSChris Mason struct file_ra_state *ra = NULL; 12664cb5300bSChris Mason unsigned long last_index; 1267151a31b2SLi Zefan u64 isize = i_size_read(inode); 1268940100a4SChris Mason u64 last_len = 0; 1269940100a4SChris Mason u64 skip = 0; 1270940100a4SChris Mason u64 defrag_end = 0; 12714cb5300bSChris Mason u64 newer_off = range->start; 1272f46b5a66SChristoph Hellwig unsigned long i; 1273008873eaSLi Zefan unsigned long ra_index = 0; 1274f46b5a66SChristoph Hellwig int ret; 12754cb5300bSChris Mason int defrag_count = 0; 12761a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1277aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 1278ee22184bSByongho Lee unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT; 1279c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1280ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 12814cb5300bSChris Mason struct page **pages = NULL; 12824cb5300bSChris Mason 12830abd5b17SLiu Bo if (isize == 0) 12840abd5b17SLiu Bo return 0; 12850abd5b17SLiu Bo 12860abd5b17SLiu Bo if (range->start >= isize) 12870abd5b17SLiu Bo return -EINVAL; 12881a419d85SLi Zefan 12891a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12901a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12911a419d85SLi Zefan return -EINVAL; 12921a419d85SLi Zefan if (range->compress_type) 12931a419d85SLi Zefan compress_type = range->compress_type; 12941a419d85SLi Zefan } 1295f46b5a66SChristoph Hellwig 12960abd5b17SLiu Bo if (extent_thresh == 0) 1297ee22184bSByongho Lee extent_thresh = SZ_256K; 1298f46b5a66SChristoph Hellwig 12994cb5300bSChris Mason /* 13004cb5300bSChris Mason * if we were not given a file, allocate a readahead 13014cb5300bSChris Mason * context 13024cb5300bSChris Mason */ 13034cb5300bSChris Mason if (!file) { 13044cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 13054cb5300bSChris Mason if (!ra) 13064cb5300bSChris Mason return -ENOMEM; 13074cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 13084cb5300bSChris Mason } else { 13094cb5300bSChris Mason ra = &file->f_ra; 13104cb5300bSChris Mason } 13114cb5300bSChris Mason 1312d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 13134cb5300bSChris Mason GFP_NOFS); 13144cb5300bSChris Mason if (!pages) { 13154cb5300bSChris Mason ret = -ENOMEM; 13164cb5300bSChris Mason goto out_ra; 13174cb5300bSChris Mason } 13184cb5300bSChris Mason 13194cb5300bSChris Mason /* find the last page to defrag */ 13201e701a32SChris Mason if (range->start + range->len > range->start) { 1321151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13221e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13231e701a32SChris Mason } else { 1324151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13251e701a32SChris Mason } 13261e701a32SChris Mason 13274cb5300bSChris Mason if (newer_than) { 13284cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1329ee22184bSByongho Lee &newer_off, SZ_64K); 13304cb5300bSChris Mason if (!ret) { 13314cb5300bSChris Mason range->start = newer_off; 13324cb5300bSChris Mason /* 13334cb5300bSChris Mason * we always align our defrag to help keep 13344cb5300bSChris Mason * the extents in the file evenly spaced 13354cb5300bSChris Mason */ 13364cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13374cb5300bSChris Mason } else 13384cb5300bSChris Mason goto out_ra; 13394cb5300bSChris Mason } else { 13401e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13414cb5300bSChris Mason } 13424cb5300bSChris Mason if (!max_to_defrag) 1343070034bdSchandan max_to_defrag = last_index - i + 1; 13444cb5300bSChris Mason 13452a0f7f57SLi Zefan /* 13462a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13472a0f7f57SLi Zefan * written sequentially. 13482a0f7f57SLi Zefan */ 13492a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13502a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13512a0f7f57SLi Zefan 1352f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1353ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13544cb5300bSChris Mason /* 13554cb5300bSChris Mason * make sure we stop running if someone unmounts 13564cb5300bSChris Mason * the FS 13574cb5300bSChris Mason */ 13584cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13594cb5300bSChris Mason break; 13604cb5300bSChris Mason 1361210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1362f14d104dSDavid Sterba btrfs_debug(root->fs_info, "defrag_file cancelled"); 1363210549ebSDavid Sterba ret = -EAGAIN; 1364210549ebSDavid Sterba break; 1365210549ebSDavid Sterba } 1366210549ebSDavid Sterba 136766c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13686c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1369a43a2111SAndrew Mahone &defrag_end, range->flags & 1370a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1371940100a4SChris Mason unsigned long next; 1372940100a4SChris Mason /* 1373940100a4SChris Mason * the should_defrag function tells us how much to skip 1374940100a4SChris Mason * bump our counter by the suggested amount 1375940100a4SChris Mason */ 1376ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1377940100a4SChris Mason i = max(i + 1, next); 1378940100a4SChris Mason continue; 1379940100a4SChris Mason } 1380008873eaSLi Zefan 1381008873eaSLi Zefan if (!newer_than) { 1382008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1383008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1384008873eaSLi Zefan cluster = min(cluster, max_cluster); 1385008873eaSLi Zefan } else { 1386008873eaSLi Zefan cluster = max_cluster; 1387008873eaSLi Zefan } 1388008873eaSLi Zefan 1389008873eaSLi Zefan if (i + cluster > ra_index) { 1390008873eaSLi Zefan ra_index = max(i, ra_index); 1391008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1392008873eaSLi Zefan cluster); 1393e4826a5bSchandan ra_index += cluster; 1394008873eaSLi Zefan } 13954cb5300bSChris Mason 13965955102cSAl Viro inode_lock(inode); 1397633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1398633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1399008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1400ecb8bea8SLiu Bo if (ret < 0) { 14015955102cSAl Viro inode_unlock(inode); 14024cb5300bSChris Mason goto out_ra; 1403ecb8bea8SLiu Bo } 14044cb5300bSChris Mason 14054cb5300bSChris Mason defrag_count += ret; 1406d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 14075955102cSAl Viro inode_unlock(inode); 14084cb5300bSChris Mason 14094cb5300bSChris Mason if (newer_than) { 14104cb5300bSChris Mason if (newer_off == (u64)-1) 14114cb5300bSChris Mason break; 14124cb5300bSChris Mason 1413e1f041e1SLiu Bo if (ret > 0) 1414e1f041e1SLiu Bo i += ret; 1415e1f041e1SLiu Bo 14164cb5300bSChris Mason newer_off = max(newer_off + 1, 14174cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14184cb5300bSChris Mason 1419ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1420ee22184bSByongho Lee &newer_off, SZ_64K); 14214cb5300bSChris Mason if (!ret) { 14224cb5300bSChris Mason range->start = newer_off; 14234cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14244cb5300bSChris Mason } else { 14254cb5300bSChris Mason break; 1426940100a4SChris Mason } 14274cb5300bSChris Mason } else { 1428008873eaSLi Zefan if (ret > 0) { 1429cbcc8326SLi Zefan i += ret; 1430008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1431008873eaSLi Zefan } else { 1432940100a4SChris Mason i++; 1433008873eaSLi Zefan last_len = 0; 1434008873eaSLi Zefan } 1435f46b5a66SChristoph Hellwig } 14364cb5300bSChris Mason } 1437f46b5a66SChristoph Hellwig 1438dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14391e701a32SChris Mason filemap_flush(inode->i_mapping); 1440dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1441dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1442dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1443dec8ef90SFilipe Manana } 14441e701a32SChris Mason 14451e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14461e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14471e701a32SChris Mason * we have to make sure the IO is actually started and that 14481e701a32SChris Mason * ordered extents get created before we return 14491e701a32SChris Mason */ 14501e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14511e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14521e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14531e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14541e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14551e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14561e701a32SChris Mason } 14571e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14581e701a32SChris Mason } 14591e701a32SChris Mason 14601a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14612b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14621a419d85SLi Zefan } 14631a419d85SLi Zefan 146460ccf82fSDiego Calleja ret = defrag_count; 1465940100a4SChris Mason 14664cb5300bSChris Mason out_ra: 1467633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 14685955102cSAl Viro inode_lock(inode); 1469633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 14705955102cSAl Viro inode_unlock(inode); 1471633085c7SFilipe David Borba Manana } 14724cb5300bSChris Mason if (!file) 14734cb5300bSChris Mason kfree(ra); 14744cb5300bSChris Mason kfree(pages); 1475940100a4SChris Mason return ret; 1476f46b5a66SChristoph Hellwig } 1477f46b5a66SChristoph Hellwig 1478198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 147976dda93cSYan, Zheng void __user *arg) 1480f46b5a66SChristoph Hellwig { 1481f46b5a66SChristoph Hellwig u64 new_size; 1482f46b5a66SChristoph Hellwig u64 old_size; 1483f46b5a66SChristoph Hellwig u64 devid = 1; 1484496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1485f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1486f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1487f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1488f46b5a66SChristoph Hellwig char *sizestr; 14899a40f122SGui Hecheng char *retptr; 1490f46b5a66SChristoph Hellwig char *devstr = NULL; 1491f46b5a66SChristoph Hellwig int ret = 0; 1492f46b5a66SChristoph Hellwig int mod = 0; 1493f46b5a66SChristoph Hellwig 1494e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1495e441d54dSChris Mason return -EPERM; 1496e441d54dSChris Mason 1497198605a8SMiao Xie ret = mnt_want_write_file(file); 1498198605a8SMiao Xie if (ret) 1499198605a8SMiao Xie return ret; 1500198605a8SMiao Xie 15015ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 15025ac00addSStefan Behrens 1)) { 150397547676SMiao Xie mnt_drop_write_file(file); 1504e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1505c9e9f97bSIlya Dryomov } 1506c9e9f97bSIlya Dryomov 15075ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1508dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1509c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1510c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1511c9e9f97bSIlya Dryomov goto out; 1512c9e9f97bSIlya Dryomov } 15135516e595SMark Fasheh 15145516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1515f46b5a66SChristoph Hellwig 1516f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1517f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1518f46b5a66SChristoph Hellwig if (devstr) { 1519f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1520f46b5a66SChristoph Hellwig *devstr = '\0'; 1521f46b5a66SChristoph Hellwig devstr = vol_args->name; 152258dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 152358dfae63SZhangZhen if (ret) 152458dfae63SZhangZhen goto out_free; 1525dfd79829SMiao Xie if (!devid) { 1526dfd79829SMiao Xie ret = -EINVAL; 1527dfd79829SMiao Xie goto out_free; 1528dfd79829SMiao Xie } 1529efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1530f46b5a66SChristoph Hellwig } 1531dba60f3fSMiao Xie 1532aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1533f46b5a66SChristoph Hellwig if (!device) { 1534efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1535c1c9ff7cSGeert Uytterhoeven devid); 1536dfd79829SMiao Xie ret = -ENODEV; 1537c9e9f97bSIlya Dryomov goto out_free; 1538f46b5a66SChristoph Hellwig } 1539dba60f3fSMiao Xie 1540dba60f3fSMiao Xie if (!device->writeable) { 1541efe120a0SFrank Holton btrfs_info(root->fs_info, 1542efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1543c1c9ff7cSGeert Uytterhoeven devid); 1544dfd79829SMiao Xie ret = -EPERM; 15454e42ae1bSLiu Bo goto out_free; 15464e42ae1bSLiu Bo } 15474e42ae1bSLiu Bo 1548f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1549f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1550f46b5a66SChristoph Hellwig else { 1551f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1552f46b5a66SChristoph Hellwig mod = -1; 1553f46b5a66SChristoph Hellwig sizestr++; 1554f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1555f46b5a66SChristoph Hellwig mod = 1; 1556f46b5a66SChristoph Hellwig sizestr++; 1557f46b5a66SChristoph Hellwig } 15589a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15599a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1560f46b5a66SChristoph Hellwig ret = -EINVAL; 1561c9e9f97bSIlya Dryomov goto out_free; 1562f46b5a66SChristoph Hellwig } 1563f46b5a66SChristoph Hellwig } 1564f46b5a66SChristoph Hellwig 156563a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1566dfd79829SMiao Xie ret = -EPERM; 156763a212abSStefan Behrens goto out_free; 156863a212abSStefan Behrens } 156963a212abSStefan Behrens 15707cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1571f46b5a66SChristoph Hellwig 1572f46b5a66SChristoph Hellwig if (mod < 0) { 1573f46b5a66SChristoph Hellwig if (new_size > old_size) { 1574f46b5a66SChristoph Hellwig ret = -EINVAL; 1575c9e9f97bSIlya Dryomov goto out_free; 1576f46b5a66SChristoph Hellwig } 1577f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1578f46b5a66SChristoph Hellwig } else if (mod > 0) { 1579eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1580902c68a4SGui Hecheng ret = -ERANGE; 1581eb8052e0SWenliang Fan goto out_free; 1582eb8052e0SWenliang Fan } 1583f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1584f46b5a66SChristoph Hellwig } 1585f46b5a66SChristoph Hellwig 1586ee22184bSByongho Lee if (new_size < SZ_256M) { 1587f46b5a66SChristoph Hellwig ret = -EINVAL; 1588c9e9f97bSIlya Dryomov goto out_free; 1589f46b5a66SChristoph Hellwig } 1590f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1591f46b5a66SChristoph Hellwig ret = -EFBIG; 1592c9e9f97bSIlya Dryomov goto out_free; 1593f46b5a66SChristoph Hellwig } 1594f46b5a66SChristoph Hellwig 1595b8b93addSDavid Sterba new_size = div_u64(new_size, root->sectorsize); 1596f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1597f46b5a66SChristoph Hellwig 1598ecaeb14bSDavid Sterba btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", 1599c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1600f46b5a66SChristoph Hellwig 1601f46b5a66SChristoph Hellwig if (new_size > old_size) { 1602a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 160398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 160498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1605c9e9f97bSIlya Dryomov goto out_free; 160698d5dc13STsutomu Itoh } 1607f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1608f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1609ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1610f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 16110253f40eSjeff.liu } /* equal, nothing need to do */ 1612f46b5a66SChristoph Hellwig 1613c9e9f97bSIlya Dryomov out_free: 1614f46b5a66SChristoph Hellwig kfree(vol_args); 1615c9e9f97bSIlya Dryomov out: 1616c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16175ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 161818f39c41SIlya Dryomov mnt_drop_write_file(file); 1619f46b5a66SChristoph Hellwig return ret; 1620f46b5a66SChristoph Hellwig } 1621f46b5a66SChristoph Hellwig 162272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16236f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16246f72c7e2SArne Jansen u64 *transid, bool readonly, 16258696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1626f46b5a66SChristoph Hellwig { 1627f46b5a66SChristoph Hellwig int namelen; 16283de4586cSChris Mason int ret = 0; 1629f46b5a66SChristoph Hellwig 1630a874a63eSLiu Bo ret = mnt_want_write_file(file); 1631a874a63eSLiu Bo if (ret) 1632a874a63eSLiu Bo goto out; 1633a874a63eSLiu Bo 163472fd032eSSage Weil namelen = strlen(name); 163572fd032eSSage Weil if (strchr(name, '/')) { 1636f46b5a66SChristoph Hellwig ret = -EINVAL; 1637a874a63eSLiu Bo goto out_drop_write; 1638f46b5a66SChristoph Hellwig } 1639f46b5a66SChristoph Hellwig 164016780cabSChris Mason if (name[0] == '.' && 164116780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 164216780cabSChris Mason ret = -EEXIST; 1643a874a63eSLiu Bo goto out_drop_write; 164416780cabSChris Mason } 164516780cabSChris Mason 16463de4586cSChris Mason if (subvol) { 164772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16486f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1649cb8e7090SChristoph Hellwig } else { 16502903ff01SAl Viro struct fd src = fdget(fd); 16513de4586cSChris Mason struct inode *src_inode; 16522903ff01SAl Viro if (!src.file) { 16533de4586cSChris Mason ret = -EINVAL; 1654a874a63eSLiu Bo goto out_drop_write; 16553de4586cSChris Mason } 16563de4586cSChris Mason 1657496ad9aaSAl Viro src_inode = file_inode(src.file); 1658496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1659efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1660efe120a0SFrank Holton "Snapshot src from another FS"); 166123ad5b17SKusanagi Kouichi ret = -EXDEV; 1662d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1663d0242061SDavid Sterba /* 1664d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1665d0242061SDavid Sterba * are limited to own subvolumes only 1666d0242061SDavid Sterba */ 1667d0242061SDavid Sterba ret = -EPERM; 1668ecd18815SAl Viro } else { 166972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 167072fd032eSSage Weil BTRFS_I(src_inode)->root, 16716f72c7e2SArne Jansen transid, readonly, inherit); 1672ecd18815SAl Viro } 16732903ff01SAl Viro fdput(src); 1674cb8e7090SChristoph Hellwig } 1675a874a63eSLiu Bo out_drop_write: 1676a874a63eSLiu Bo mnt_drop_write_file(file); 1677f46b5a66SChristoph Hellwig out: 167872fd032eSSage Weil return ret; 167972fd032eSSage Weil } 168072fd032eSSage Weil 168172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1682fa0d2b9bSLi Zefan void __user *arg, int subvol) 168372fd032eSSage Weil { 1684fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 168572fd032eSSage Weil int ret; 168672fd032eSSage Weil 1687fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1688fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1689fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1690fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1691fa0d2b9bSLi Zefan 1692fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1693b83cc969SLi Zefan vol_args->fd, subvol, 16946f72c7e2SArne Jansen NULL, false, NULL); 1695fa0d2b9bSLi Zefan 1696fa0d2b9bSLi Zefan kfree(vol_args); 1697fa0d2b9bSLi Zefan return ret; 1698fa0d2b9bSLi Zefan } 1699fa0d2b9bSLi Zefan 1700fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1701fa0d2b9bSLi Zefan void __user *arg, int subvol) 1702fa0d2b9bSLi Zefan { 1703fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1704fa0d2b9bSLi Zefan int ret; 1705fdfb1e4fSLi Zefan u64 transid = 0; 1706fdfb1e4fSLi Zefan u64 *ptr = NULL; 1707b83cc969SLi Zefan bool readonly = false; 17086f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 170972fd032eSSage Weil 1710fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1711fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1712fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1713fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1714fdfb1e4fSLi Zefan 1715b83cc969SLi Zefan if (vol_args->flags & 17166f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17176f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1718b83cc969SLi Zefan ret = -EOPNOTSUPP; 1719c47ca32dSDan Carpenter goto free_args; 1720fdfb1e4fSLi Zefan } 1721fdfb1e4fSLi Zefan 1722fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1723fdfb1e4fSLi Zefan ptr = &transid; 1724b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1725b83cc969SLi Zefan readonly = true; 17266f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17276f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17286f72c7e2SArne Jansen ret = -EINVAL; 1729c47ca32dSDan Carpenter goto free_args; 17306f72c7e2SArne Jansen } 17316f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17326f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17336f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1734c47ca32dSDan Carpenter goto free_args; 17356f72c7e2SArne Jansen } 17366f72c7e2SArne Jansen } 173775eaa0e2SSage Weil 1738fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17396f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17408696c533SMiao Xie readonly, inherit); 1741c47ca32dSDan Carpenter if (ret) 1742c47ca32dSDan Carpenter goto free_inherit; 174375eaa0e2SSage Weil 1744c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1745fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1746c47ca32dSDan Carpenter transid), 1747c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 174875eaa0e2SSage Weil ret = -EFAULT; 1749c47ca32dSDan Carpenter 1750c47ca32dSDan Carpenter free_inherit: 17516f72c7e2SArne Jansen kfree(inherit); 1752c47ca32dSDan Carpenter free_args: 1753c47ca32dSDan Carpenter kfree(vol_args); 1754f46b5a66SChristoph Hellwig return ret; 1755f46b5a66SChristoph Hellwig } 1756f46b5a66SChristoph Hellwig 17570caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17580caa102dSLi Zefan void __user *arg) 17590caa102dSLi Zefan { 1760496ad9aaSAl Viro struct inode *inode = file_inode(file); 17610caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17620caa102dSLi Zefan int ret = 0; 17630caa102dSLi Zefan u64 flags = 0; 17640caa102dSLi Zefan 176533345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17660caa102dSLi Zefan return -EINVAL; 17670caa102dSLi Zefan 17680caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17690caa102dSLi Zefan if (btrfs_root_readonly(root)) 17700caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17710caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17720caa102dSLi Zefan 17730caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17740caa102dSLi Zefan ret = -EFAULT; 17750caa102dSLi Zefan 17760caa102dSLi Zefan return ret; 17770caa102dSLi Zefan } 17780caa102dSLi Zefan 17790caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17800caa102dSLi Zefan void __user *arg) 17810caa102dSLi Zefan { 1782496ad9aaSAl Viro struct inode *inode = file_inode(file); 17830caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17840caa102dSLi Zefan struct btrfs_trans_handle *trans; 17850caa102dSLi Zefan u64 root_flags; 17860caa102dSLi Zefan u64 flags; 17870caa102dSLi Zefan int ret = 0; 17880caa102dSLi Zefan 1789bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1790bd60ea0fSDavid Sterba return -EPERM; 1791bd60ea0fSDavid Sterba 1792b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1793b9ca0664SLiu Bo if (ret) 1794b9ca0664SLiu Bo goto out; 17950caa102dSLi Zefan 1796b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1797b9ca0664SLiu Bo ret = -EINVAL; 1798b9ca0664SLiu Bo goto out_drop_write; 1799b9ca0664SLiu Bo } 18000caa102dSLi Zefan 1801b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1802b9ca0664SLiu Bo ret = -EFAULT; 1803b9ca0664SLiu Bo goto out_drop_write; 1804b9ca0664SLiu Bo } 18050caa102dSLi Zefan 1806b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1807b9ca0664SLiu Bo ret = -EINVAL; 1808b9ca0664SLiu Bo goto out_drop_write; 1809b9ca0664SLiu Bo } 18100caa102dSLi Zefan 1811b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1812b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1813b9ca0664SLiu Bo goto out_drop_write; 1814b9ca0664SLiu Bo } 18150caa102dSLi Zefan 18160caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 18170caa102dSLi Zefan 18180caa102dSLi Zefan /* nothing to do */ 18190caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1820b9ca0664SLiu Bo goto out_drop_sem; 18210caa102dSLi Zefan 18220caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18232c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18240caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18250caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18262c686537SDavid Sterba } else { 18272c686537SDavid Sterba /* 18282c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18292c686537SDavid Sterba * send 18302c686537SDavid Sterba */ 18312c686537SDavid Sterba spin_lock(&root->root_item_lock); 18322c686537SDavid Sterba if (root->send_in_progress == 0) { 18330caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18340caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18352c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18362c686537SDavid Sterba } else { 18372c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18382c686537SDavid Sterba btrfs_warn(root->fs_info, 18392c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18402c686537SDavid Sterba root->root_key.objectid); 18412c686537SDavid Sterba ret = -EPERM; 18422c686537SDavid Sterba goto out_drop_sem; 18432c686537SDavid Sterba } 18442c686537SDavid Sterba } 18450caa102dSLi Zefan 18460caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18470caa102dSLi Zefan if (IS_ERR(trans)) { 18480caa102dSLi Zefan ret = PTR_ERR(trans); 18490caa102dSLi Zefan goto out_reset; 18500caa102dSLi Zefan } 18510caa102dSLi Zefan 1852b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18530caa102dSLi Zefan &root->root_key, &root->root_item); 18540caa102dSLi Zefan 18550caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18560caa102dSLi Zefan out_reset: 18570caa102dSLi Zefan if (ret) 18580caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1859b9ca0664SLiu Bo out_drop_sem: 18600caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1861b9ca0664SLiu Bo out_drop_write: 1862b9ca0664SLiu Bo mnt_drop_write_file(file); 1863b9ca0664SLiu Bo out: 18640caa102dSLi Zefan return ret; 18650caa102dSLi Zefan } 18660caa102dSLi Zefan 186776dda93cSYan, Zheng /* 186876dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 186976dda93cSYan, Zheng */ 187076dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 187176dda93cSYan, Zheng { 187276dda93cSYan, Zheng struct btrfs_path *path; 1873175a2b87SJosef Bacik struct btrfs_dir_item *di; 187476dda93cSYan, Zheng struct btrfs_key key; 1875175a2b87SJosef Bacik u64 dir_id; 187676dda93cSYan, Zheng int ret; 187776dda93cSYan, Zheng 187876dda93cSYan, Zheng path = btrfs_alloc_path(); 187976dda93cSYan, Zheng if (!path) 188076dda93cSYan, Zheng return -ENOMEM; 188176dda93cSYan, Zheng 1882175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1883175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1884175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1885175a2b87SJosef Bacik dir_id, "default", 7, 0); 1886175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1887175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1888175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 188972de6b53SGuangyu Sun ret = -EPERM; 189072de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 189172de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1892175a2b87SJosef Bacik goto out; 1893175a2b87SJosef Bacik } 1894175a2b87SJosef Bacik btrfs_release_path(path); 1895175a2b87SJosef Bacik } 1896175a2b87SJosef Bacik 189776dda93cSYan, Zheng key.objectid = root->root_key.objectid; 189876dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 189976dda93cSYan, Zheng key.offset = (u64)-1; 190076dda93cSYan, Zheng 190176dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 190276dda93cSYan, Zheng &key, path, 0, 0); 190376dda93cSYan, Zheng if (ret < 0) 190476dda93cSYan, Zheng goto out; 190576dda93cSYan, Zheng BUG_ON(ret == 0); 190676dda93cSYan, Zheng 190776dda93cSYan, Zheng ret = 0; 190876dda93cSYan, Zheng if (path->slots[0] > 0) { 190976dda93cSYan, Zheng path->slots[0]--; 191076dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 191176dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 191276dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 191376dda93cSYan, Zheng ret = -ENOTEMPTY; 191476dda93cSYan, Zheng } 191576dda93cSYan, Zheng out: 191676dda93cSYan, Zheng btrfs_free_path(path); 191776dda93cSYan, Zheng return ret; 191876dda93cSYan, Zheng } 191976dda93cSYan, Zheng 1920ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1921ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1922ac8e9819SChris Mason { 1923abc6e134SChris Mason struct btrfs_key test; 1924abc6e134SChris Mason int ret; 1925abc6e134SChris Mason 1926abc6e134SChris Mason test.objectid = sk->min_objectid; 1927abc6e134SChris Mason test.type = sk->min_type; 1928abc6e134SChris Mason test.offset = sk->min_offset; 1929abc6e134SChris Mason 1930abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1931abc6e134SChris Mason if (ret < 0) 1932ac8e9819SChris Mason return 0; 1933abc6e134SChris Mason 1934abc6e134SChris Mason test.objectid = sk->max_objectid; 1935abc6e134SChris Mason test.type = sk->max_type; 1936abc6e134SChris Mason test.offset = sk->max_offset; 1937abc6e134SChris Mason 1938abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1939abc6e134SChris Mason if (ret > 0) 1940ac8e9819SChris Mason return 0; 1941ac8e9819SChris Mason return 1; 1942ac8e9819SChris Mason } 1943ac8e9819SChris Mason 1944ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1945ac8e9819SChris Mason struct btrfs_path *path, 1946ac8e9819SChris Mason struct btrfs_key *key, 1947ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19489b6e817dSGerhard Heift size_t *buf_size, 1949ba346b35SGerhard Heift char __user *ubuf, 1950ac8e9819SChris Mason unsigned long *sk_offset, 1951ac8e9819SChris Mason int *num_found) 1952ac8e9819SChris Mason { 1953ac8e9819SChris Mason u64 found_transid; 1954ac8e9819SChris Mason struct extent_buffer *leaf; 1955ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1956dd81d459SNaohiro Aota struct btrfs_key test; 1957ac8e9819SChris Mason unsigned long item_off; 1958ac8e9819SChris Mason unsigned long item_len; 1959ac8e9819SChris Mason int nritems; 1960ac8e9819SChris Mason int i; 1961ac8e9819SChris Mason int slot; 1962ac8e9819SChris Mason int ret = 0; 1963ac8e9819SChris Mason 1964ac8e9819SChris Mason leaf = path->nodes[0]; 1965ac8e9819SChris Mason slot = path->slots[0]; 1966ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1967ac8e9819SChris Mason 1968ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1969ac8e9819SChris Mason i = nritems; 1970ac8e9819SChris Mason goto advance_key; 1971ac8e9819SChris Mason } 1972ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1973ac8e9819SChris Mason 1974ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1975ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1976ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1977ac8e9819SChris Mason 197803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 197903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 198003b71c6cSGabriel de Perthuis continue; 198103b71c6cSGabriel de Perthuis 19829b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19838f5f6178SGerhard Heift if (*num_found) { 1984ac8e9819SChris Mason ret = 1; 19858f5f6178SGerhard Heift goto out; 19868f5f6178SGerhard Heift } 19878f5f6178SGerhard Heift 19888f5f6178SGerhard Heift /* 19898f5f6178SGerhard Heift * return one empty item back for v1, which does not 19908f5f6178SGerhard Heift * handle -EOVERFLOW 19918f5f6178SGerhard Heift */ 19928f5f6178SGerhard Heift 19939b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1994ac8e9819SChris Mason item_len = 0; 19958f5f6178SGerhard Heift ret = -EOVERFLOW; 19968f5f6178SGerhard Heift } 1997ac8e9819SChris Mason 19989b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1999ac8e9819SChris Mason ret = 1; 200025c9bc2eSGerhard Heift goto out; 2001ac8e9819SChris Mason } 2002ac8e9819SChris Mason 2003ac8e9819SChris Mason sh.objectid = key->objectid; 2004ac8e9819SChris Mason sh.offset = key->offset; 2005ac8e9819SChris Mason sh.type = key->type; 2006ac8e9819SChris Mason sh.len = item_len; 2007ac8e9819SChris Mason sh.transid = found_transid; 2008ac8e9819SChris Mason 2009ac8e9819SChris Mason /* copy search result header */ 2010ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2011ba346b35SGerhard Heift ret = -EFAULT; 2012ba346b35SGerhard Heift goto out; 2013ba346b35SGerhard Heift } 2014ba346b35SGerhard Heift 2015ac8e9819SChris Mason *sk_offset += sizeof(sh); 2016ac8e9819SChris Mason 2017ac8e9819SChris Mason if (item_len) { 2018ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2019ac8e9819SChris Mason /* copy the item */ 2020ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2021ba346b35SGerhard Heift item_off, item_len)) { 2022ba346b35SGerhard Heift ret = -EFAULT; 2023ba346b35SGerhard Heift goto out; 2024ba346b35SGerhard Heift } 2025ba346b35SGerhard Heift 2026ac8e9819SChris Mason *sk_offset += item_len; 2027ac8e9819SChris Mason } 2028e2156867SHugo Mills (*num_found)++; 2029ac8e9819SChris Mason 20308f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20318f5f6178SGerhard Heift goto out; 20328f5f6178SGerhard Heift 203325c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 203425c9bc2eSGerhard Heift ret = 1; 203525c9bc2eSGerhard Heift goto out; 203625c9bc2eSGerhard Heift } 2037ac8e9819SChris Mason } 2038ac8e9819SChris Mason advance_key: 2039ac8e9819SChris Mason ret = 0; 2040dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2041dd81d459SNaohiro Aota test.type = sk->max_type; 2042dd81d459SNaohiro Aota test.offset = sk->max_offset; 2043dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2044dd81d459SNaohiro Aota ret = 1; 2045dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2046abc6e134SChris Mason key->offset++; 2047dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2048abc6e134SChris Mason key->offset = 0; 2049abc6e134SChris Mason key->type++; 2050dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2051abc6e134SChris Mason key->offset = 0; 2052abc6e134SChris Mason key->type = 0; 2053abc6e134SChris Mason key->objectid++; 2054abc6e134SChris Mason } else 2055abc6e134SChris Mason ret = 1; 205625c9bc2eSGerhard Heift out: 2057ba346b35SGerhard Heift /* 2058ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2059ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2060ba346b35SGerhard Heift * * all items were found 2061ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2062ba346b35SGerhard Heift * leaf 2063ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2064ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2065ba346b35SGerhard Heift */ 2066ac8e9819SChris Mason return ret; 2067ac8e9819SChris Mason } 2068ac8e9819SChris Mason 2069ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 207012544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20719b6e817dSGerhard Heift size_t *buf_size, 2072ba346b35SGerhard Heift char __user *ubuf) 2073ac8e9819SChris Mason { 2074ac8e9819SChris Mason struct btrfs_root *root; 2075ac8e9819SChris Mason struct btrfs_key key; 2076ac8e9819SChris Mason struct btrfs_path *path; 2077ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2078ac8e9819SChris Mason int ret; 2079ac8e9819SChris Mason int num_found = 0; 2080ac8e9819SChris Mason unsigned long sk_offset = 0; 2081ac8e9819SChris Mason 20829b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20839b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 208412544442SGerhard Heift return -EOVERFLOW; 20859b6e817dSGerhard Heift } 208612544442SGerhard Heift 2087ac8e9819SChris Mason path = btrfs_alloc_path(); 2088ac8e9819SChris Mason if (!path) 2089ac8e9819SChris Mason return -ENOMEM; 2090ac8e9819SChris Mason 2091ac8e9819SChris Mason if (sk->tree_id == 0) { 2092ac8e9819SChris Mason /* search the root of the inode that was passed */ 2093ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2094ac8e9819SChris Mason } else { 2095ac8e9819SChris Mason key.objectid = sk->tree_id; 2096ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2097ac8e9819SChris Mason key.offset = (u64)-1; 2098ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2099ac8e9819SChris Mason if (IS_ERR(root)) { 2100f14d104dSDavid Sterba btrfs_err(info, "could not find root %llu", 2101ac8e9819SChris Mason sk->tree_id); 2102ac8e9819SChris Mason btrfs_free_path(path); 2103ac8e9819SChris Mason return -ENOENT; 2104ac8e9819SChris Mason } 2105ac8e9819SChris Mason } 2106ac8e9819SChris Mason 2107ac8e9819SChris Mason key.objectid = sk->min_objectid; 2108ac8e9819SChris Mason key.type = sk->min_type; 2109ac8e9819SChris Mason key.offset = sk->min_offset; 2110ac8e9819SChris Mason 2111ac8e9819SChris Mason while (1) { 21126174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2113ac8e9819SChris Mason if (ret != 0) { 2114ac8e9819SChris Mason if (ret > 0) 2115ac8e9819SChris Mason ret = 0; 2116ac8e9819SChris Mason goto err; 2117ac8e9819SChris Mason } 2118ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2119ac8e9819SChris Mason &sk_offset, &num_found); 2120b3b4aa74SDavid Sterba btrfs_release_path(path); 212125c9bc2eSGerhard Heift if (ret) 2122ac8e9819SChris Mason break; 2123ac8e9819SChris Mason 2124ac8e9819SChris Mason } 21258f5f6178SGerhard Heift if (ret > 0) 2126ac8e9819SChris Mason ret = 0; 2127ac8e9819SChris Mason err: 2128ac8e9819SChris Mason sk->nr_items = num_found; 2129ac8e9819SChris Mason btrfs_free_path(path); 2130ac8e9819SChris Mason return ret; 2131ac8e9819SChris Mason } 2132ac8e9819SChris Mason 2133ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2134ac8e9819SChris Mason void __user *argp) 2135ac8e9819SChris Mason { 2136ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2137ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2138ac8e9819SChris Mason struct inode *inode; 2139ac8e9819SChris Mason int ret; 21409b6e817dSGerhard Heift size_t buf_size; 2141ac8e9819SChris Mason 2142ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2143ac8e9819SChris Mason return -EPERM; 2144ac8e9819SChris Mason 2145ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2146ac8e9819SChris Mason 2147ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2148ba346b35SGerhard Heift return -EFAULT; 2149ba346b35SGerhard Heift 2150ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2151ac8e9819SChris Mason 2152496ad9aaSAl Viro inode = file_inode(file); 2153ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21548f5f6178SGerhard Heift 21558f5f6178SGerhard Heift /* 21568f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21578f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21588f5f6178SGerhard Heift */ 21598f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21608f5f6178SGerhard Heift ret = 0; 21618f5f6178SGerhard Heift 2162ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2163ac8e9819SChris Mason ret = -EFAULT; 2164ac8e9819SChris Mason return ret; 2165ac8e9819SChris Mason } 2166ac8e9819SChris Mason 2167cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2168cc68a8a5SGerhard Heift void __user *argp) 2169cc68a8a5SGerhard Heift { 2170cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2171cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2172cc68a8a5SGerhard Heift struct inode *inode; 2173cc68a8a5SGerhard Heift int ret; 2174cc68a8a5SGerhard Heift size_t buf_size; 2175ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2176cc68a8a5SGerhard Heift 2177cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2178cc68a8a5SGerhard Heift return -EPERM; 2179cc68a8a5SGerhard Heift 2180cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2181cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2182cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2183cc68a8a5SGerhard Heift return -EFAULT; 2184cc68a8a5SGerhard Heift 2185cc68a8a5SGerhard Heift buf_size = args.buf_size; 2186cc68a8a5SGerhard Heift 2187cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2188cc68a8a5SGerhard Heift return -EOVERFLOW; 2189cc68a8a5SGerhard Heift 2190cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2191cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2192cc68a8a5SGerhard Heift buf_size = buf_limit; 2193cc68a8a5SGerhard Heift 2194cc68a8a5SGerhard Heift inode = file_inode(file); 2195cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2196cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2197cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2198cc68a8a5SGerhard Heift ret = -EFAULT; 2199cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2200cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2201cc68a8a5SGerhard Heift ret = -EFAULT; 2202cc68a8a5SGerhard Heift 220376dda93cSYan, Zheng return ret; 220476dda93cSYan, Zheng } 220576dda93cSYan, Zheng 220698d377a0STARUISI Hiroaki /* 2207ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2208ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 220998d377a0STARUISI Hiroaki */ 221098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 221198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 221298d377a0STARUISI Hiroaki { 221398d377a0STARUISI Hiroaki struct btrfs_root *root; 221498d377a0STARUISI Hiroaki struct btrfs_key key; 2215ac8e9819SChris Mason char *ptr; 221698d377a0STARUISI Hiroaki int ret = -1; 221798d377a0STARUISI Hiroaki int slot; 221898d377a0STARUISI Hiroaki int len; 221998d377a0STARUISI Hiroaki int total_len = 0; 222098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 222198d377a0STARUISI Hiroaki struct extent_buffer *l; 222298d377a0STARUISI Hiroaki struct btrfs_path *path; 222398d377a0STARUISI Hiroaki 222498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 222598d377a0STARUISI Hiroaki name[0]='\0'; 222698d377a0STARUISI Hiroaki return 0; 222798d377a0STARUISI Hiroaki } 222898d377a0STARUISI Hiroaki 222998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 223098d377a0STARUISI Hiroaki if (!path) 223198d377a0STARUISI Hiroaki return -ENOMEM; 223298d377a0STARUISI Hiroaki 2233ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 223498d377a0STARUISI Hiroaki 223598d377a0STARUISI Hiroaki key.objectid = tree_id; 223698d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 223798d377a0STARUISI Hiroaki key.offset = (u64)-1; 223898d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 223998d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2240f14d104dSDavid Sterba btrfs_err(info, "could not find root %llu", tree_id); 22418ad6fcabSChris Mason ret = -ENOENT; 22428ad6fcabSChris Mason goto out; 224398d377a0STARUISI Hiroaki } 224498d377a0STARUISI Hiroaki 224598d377a0STARUISI Hiroaki key.objectid = dirid; 224698d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22478ad6fcabSChris Mason key.offset = (u64)-1; 224898d377a0STARUISI Hiroaki 224998d377a0STARUISI Hiroaki while (1) { 225098d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 225198d377a0STARUISI Hiroaki if (ret < 0) 225298d377a0STARUISI Hiroaki goto out; 225318674c6cSFilipe David Borba Manana else if (ret > 0) { 225418674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 225518674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 225618674c6cSFilipe David Borba Manana if (ret < 0) 225718674c6cSFilipe David Borba Manana goto out; 225818674c6cSFilipe David Borba Manana else if (ret > 0) { 2259ac8e9819SChris Mason ret = -ENOENT; 226098d377a0STARUISI Hiroaki goto out; 2261ac8e9819SChris Mason } 226218674c6cSFilipe David Borba Manana } 226318674c6cSFilipe David Borba Manana 226418674c6cSFilipe David Borba Manana l = path->nodes[0]; 226518674c6cSFilipe David Borba Manana slot = path->slots[0]; 226618674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 226798d377a0STARUISI Hiroaki 226898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 226998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 227098d377a0STARUISI Hiroaki ptr -= len + 1; 227198d377a0STARUISI Hiroaki total_len += len + 1; 2272a696cf35SFilipe David Borba Manana if (ptr < name) { 2273a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 227498d377a0STARUISI Hiroaki goto out; 2275a696cf35SFilipe David Borba Manana } 227698d377a0STARUISI Hiroaki 227798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 227898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 227998d377a0STARUISI Hiroaki 228098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 228198d377a0STARUISI Hiroaki break; 228298d377a0STARUISI Hiroaki 2283b3b4aa74SDavid Sterba btrfs_release_path(path); 228498d377a0STARUISI Hiroaki key.objectid = key.offset; 22858ad6fcabSChris Mason key.offset = (u64)-1; 228698d377a0STARUISI Hiroaki dirid = key.objectid; 228798d377a0STARUISI Hiroaki } 228877906a50SLi Zefan memmove(name, ptr, total_len); 228998d377a0STARUISI Hiroaki name[total_len] = '\0'; 229098d377a0STARUISI Hiroaki ret = 0; 229198d377a0STARUISI Hiroaki out: 229298d377a0STARUISI Hiroaki btrfs_free_path(path); 2293ac8e9819SChris Mason return ret; 2294ac8e9819SChris Mason } 2295ac8e9819SChris Mason 2296ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2297ac8e9819SChris Mason void __user *argp) 2298ac8e9819SChris Mason { 2299ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2300ac8e9819SChris Mason struct inode *inode; 230101b810b8SDavid Sterba int ret = 0; 2302ac8e9819SChris Mason 23032354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 23042354d08fSJulia Lawall if (IS_ERR(args)) 23052354d08fSJulia Lawall return PTR_ERR(args); 2306c2b96929SDan Carpenter 2307496ad9aaSAl Viro inode = file_inode(file); 2308ac8e9819SChris Mason 230901b810b8SDavid Sterba /* 231001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 231101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 231201b810b8SDavid Sterba */ 23131b53ac4dSChris Mason if (args->treeid == 0) 23141b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 23151b53ac4dSChris Mason 231601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 231701b810b8SDavid Sterba args->name[0] = 0; 231801b810b8SDavid Sterba goto out; 231901b810b8SDavid Sterba } 232001b810b8SDavid Sterba 232101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 232201b810b8SDavid Sterba ret = -EPERM; 232301b810b8SDavid Sterba goto out; 232401b810b8SDavid Sterba } 232501b810b8SDavid Sterba 2326ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2327ac8e9819SChris Mason args->treeid, args->objectid, 2328ac8e9819SChris Mason args->name); 2329ac8e9819SChris Mason 233001b810b8SDavid Sterba out: 2331ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2332ac8e9819SChris Mason ret = -EFAULT; 2333ac8e9819SChris Mason 2334ac8e9819SChris Mason kfree(args); 233598d377a0STARUISI Hiroaki return ret; 233698d377a0STARUISI Hiroaki } 233798d377a0STARUISI Hiroaki 233876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 233976dda93cSYan, Zheng void __user *arg) 234076dda93cSYan, Zheng { 234154563d41SAl Viro struct dentry *parent = file->f_path.dentry; 234276dda93cSYan, Zheng struct dentry *dentry; 23432b0143b5SDavid Howells struct inode *dir = d_inode(parent); 234476dda93cSYan, Zheng struct inode *inode; 234576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 234676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 234776dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 234876dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2349c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2350521e0546SDavid Sterba u64 root_flags; 2351c58aaad2SMiao Xie u64 qgroup_reserved; 235276dda93cSYan, Zheng int namelen; 235376dda93cSYan, Zheng int ret; 235476dda93cSYan, Zheng int err = 0; 235576dda93cSYan, Zheng 235676dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 235776dda93cSYan, Zheng if (IS_ERR(vol_args)) 235876dda93cSYan, Zheng return PTR_ERR(vol_args); 235976dda93cSYan, Zheng 236076dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 236176dda93cSYan, Zheng namelen = strlen(vol_args->name); 236276dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 236376dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 236476dda93cSYan, Zheng err = -EINVAL; 236576dda93cSYan, Zheng goto out; 236676dda93cSYan, Zheng } 236776dda93cSYan, Zheng 2368a561be71SAl Viro err = mnt_want_write_file(file); 236976dda93cSYan, Zheng if (err) 237076dda93cSYan, Zheng goto out; 237176dda93cSYan, Zheng 2372521e0546SDavid Sterba 23735c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23745c50c9b8SDavid Sterba if (err == -EINTR) 2375e43f998eSDavid Sterba goto out_drop_write; 237676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 237776dda93cSYan, Zheng if (IS_ERR(dentry)) { 237876dda93cSYan, Zheng err = PTR_ERR(dentry); 237976dda93cSYan, Zheng goto out_unlock_dir; 238076dda93cSYan, Zheng } 238176dda93cSYan, Zheng 23822b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 238376dda93cSYan, Zheng err = -ENOENT; 238476dda93cSYan, Zheng goto out_dput; 238576dda93cSYan, Zheng } 238676dda93cSYan, Zheng 23872b0143b5SDavid Howells inode = d_inode(dentry); 23884260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23894260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23904260f7c7SSage Weil /* 23914260f7c7SSage Weil * Regular user. Only allow this with a special mount 23924260f7c7SSage Weil * option, when the user has write+exec access to the 23934260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23944260f7c7SSage Weil * allowed. 23954260f7c7SSage Weil * 23964260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23974260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23984260f7c7SSage Weil * otherwise be able to delete. 23994260f7c7SSage Weil * 24004260f7c7SSage Weil * Users who want to delete empty subvols should try 24014260f7c7SSage Weil * rmdir(2). 24024260f7c7SSage Weil */ 24034260f7c7SSage Weil err = -EPERM; 24044260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 24054260f7c7SSage Weil goto out_dput; 24064260f7c7SSage Weil 24074260f7c7SSage Weil /* 24084260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 24094260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 24104260f7c7SSage Weil * must be called on the dentry referencing the root 24114260f7c7SSage Weil * of the subvol, not a random directory contained 24124260f7c7SSage Weil * within it. 24134260f7c7SSage Weil */ 24144260f7c7SSage Weil err = -EINVAL; 24154260f7c7SSage Weil if (root == dest) 24164260f7c7SSage Weil goto out_dput; 24174260f7c7SSage Weil 24184260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 24194260f7c7SSage Weil if (err) 24204260f7c7SSage Weil goto out_dput; 24215c39da5bSMiao Xie } 24224260f7c7SSage Weil 24235c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 24244260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 24254260f7c7SSage Weil if (err) 24264260f7c7SSage Weil goto out_dput; 24274260f7c7SSage Weil 242833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 242976dda93cSYan, Zheng err = -EINVAL; 243076dda93cSYan, Zheng goto out_dput; 243176dda93cSYan, Zheng } 243276dda93cSYan, Zheng 24335955102cSAl Viro inode_lock(inode); 2434521e0546SDavid Sterba 2435521e0546SDavid Sterba /* 2436521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2437521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2438521e0546SDavid Sterba * again is not run concurrently. 2439521e0546SDavid Sterba */ 2440521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2441c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2442c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2443c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2444521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2445521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2446521e0546SDavid Sterba } else { 2447521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2448521e0546SDavid Sterba btrfs_warn(root->fs_info, 2449521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2450c55bfa67SFilipe Manana dest->root_key.objectid); 2451521e0546SDavid Sterba err = -EPERM; 2452909e26dcSOmar Sandoval goto out_unlock_inode; 2453521e0546SDavid Sterba } 2454521e0546SDavid Sterba 245576dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 245676dda93cSYan, Zheng 245776dda93cSYan, Zheng err = may_destroy_subvol(dest); 245876dda93cSYan, Zheng if (err) 245976dda93cSYan, Zheng goto out_up_write; 246076dda93cSYan, Zheng 2461c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2462c58aaad2SMiao Xie /* 2463c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2464c58aaad2SMiao Xie * ref/backref. 2465c58aaad2SMiao Xie */ 2466c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2467ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2468c58aaad2SMiao Xie if (err) 2469c58aaad2SMiao Xie goto out_up_write; 2470c58aaad2SMiao Xie 2471a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2472a22285a6SYan, Zheng if (IS_ERR(trans)) { 2473a22285a6SYan, Zheng err = PTR_ERR(trans); 2474c58aaad2SMiao Xie goto out_release; 2475a22285a6SYan, Zheng } 2476c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2477c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2478a22285a6SYan, Zheng 247976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 248076dda93cSYan, Zheng dest->root_key.objectid, 248176dda93cSYan, Zheng dentry->d_name.name, 248276dda93cSYan, Zheng dentry->d_name.len); 248379787eaaSJeff Mahoney if (ret) { 248479787eaaSJeff Mahoney err = ret; 248579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 248679787eaaSJeff Mahoney goto out_end_trans; 248779787eaaSJeff Mahoney } 248876dda93cSYan, Zheng 248976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 249076dda93cSYan, Zheng 249176dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 249276dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 249376dda93cSYan, Zheng dest->root_item.drop_level = 0; 249476dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 249576dda93cSYan, Zheng 249627cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 249776dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 249876dda93cSYan, Zheng root->fs_info->tree_root, 249976dda93cSYan, Zheng dest->root_key.objectid); 250079787eaaSJeff Mahoney if (ret) { 250179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 250279787eaaSJeff Mahoney err = ret; 250379787eaaSJeff Mahoney goto out_end_trans; 2504d68fc57bSYan, Zheng } 250579787eaaSJeff Mahoney } 2506dd5f9615SStefan Behrens 2507dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2508dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2509dd5f9615SStefan Behrens dest->root_key.objectid); 2510dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2511dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2512dd5f9615SStefan Behrens err = ret; 2513dd5f9615SStefan Behrens goto out_end_trans; 2514dd5f9615SStefan Behrens } 2515dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2516dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2517dd5f9615SStefan Behrens dest->root_item.received_uuid, 2518dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2519dd5f9615SStefan Behrens dest->root_key.objectid); 2520dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2521dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2522dd5f9615SStefan Behrens err = ret; 2523dd5f9615SStefan Behrens goto out_end_trans; 2524dd5f9615SStefan Behrens } 2525dd5f9615SStefan Behrens } 2526dd5f9615SStefan Behrens 252779787eaaSJeff Mahoney out_end_trans: 2528c58aaad2SMiao Xie trans->block_rsv = NULL; 2529c58aaad2SMiao Xie trans->bytes_reserved = 0; 2530531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 253179787eaaSJeff Mahoney if (ret && !err) 253279787eaaSJeff Mahoney err = ret; 253376dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2534c58aaad2SMiao Xie out_release: 2535c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 253676dda93cSYan, Zheng out_up_write: 253776dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 2538521e0546SDavid Sterba if (err) { 2539521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2540c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2541c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2542521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2543521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2544521e0546SDavid Sterba } 2545909e26dcSOmar Sandoval out_unlock_inode: 25465955102cSAl Viro inode_unlock(inode); 254776dda93cSYan, Zheng if (!err) { 254864ad6c48SOmar Sandoval d_invalidate(dentry); 254976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 255076dda93cSYan, Zheng d_delete(dentry); 255161155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2552fa6ac876SLiu Bo 2553fa6ac876SLiu Bo /* the last ref */ 255457cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 255557cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 255657cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2557fa6ac876SLiu Bo } 255876dda93cSYan, Zheng } 255976dda93cSYan, Zheng out_dput: 256076dda93cSYan, Zheng dput(dentry); 256176dda93cSYan, Zheng out_unlock_dir: 25625955102cSAl Viro inode_unlock(dir); 2563e43f998eSDavid Sterba out_drop_write: 25642a79f17eSAl Viro mnt_drop_write_file(file); 256576dda93cSYan, Zheng out: 256676dda93cSYan, Zheng kfree(vol_args); 256776dda93cSYan, Zheng return err; 256876dda93cSYan, Zheng } 256976dda93cSYan, Zheng 25701e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2571f46b5a66SChristoph Hellwig { 2572496ad9aaSAl Viro struct inode *inode = file_inode(file); 2573f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25741e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2575c146afadSYan Zheng int ret; 2576c146afadSYan Zheng 257725122d15SIlya Dryomov ret = mnt_want_write_file(file); 257825122d15SIlya Dryomov if (ret) 257925122d15SIlya Dryomov return ret; 2580b83cc969SLi Zefan 258125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 258225122d15SIlya Dryomov ret = -EROFS; 258325122d15SIlya Dryomov goto out; 25845ac00addSStefan Behrens } 2585f46b5a66SChristoph Hellwig 2586f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2587f46b5a66SChristoph Hellwig case S_IFDIR: 2588e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2589e441d54dSChris Mason ret = -EPERM; 2590e441d54dSChris Mason goto out; 2591e441d54dSChris Mason } 2592de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25938929ecfaSYan, Zheng if (ret) 25948929ecfaSYan, Zheng goto out; 2595de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2596f46b5a66SChristoph Hellwig break; 2597f46b5a66SChristoph Hellwig case S_IFREG: 2598e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2599e441d54dSChris Mason ret = -EINVAL; 2600e441d54dSChris Mason goto out; 2601e441d54dSChris Mason } 26021e701a32SChris Mason 26031e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 26041e701a32SChris Mason if (!range) { 26051e701a32SChris Mason ret = -ENOMEM; 26061e701a32SChris Mason goto out; 26071e701a32SChris Mason } 26081e701a32SChris Mason 26091e701a32SChris Mason if (argp) { 26101e701a32SChris Mason if (copy_from_user(range, argp, 26111e701a32SChris Mason sizeof(*range))) { 26121e701a32SChris Mason ret = -EFAULT; 26131e701a32SChris Mason kfree(range); 2614683be16eSDan Carpenter goto out; 26151e701a32SChris Mason } 26161e701a32SChris Mason /* compression requires us to start the IO */ 26171e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 26181e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 26191e701a32SChris Mason range->extent_thresh = (u32)-1; 26201e701a32SChris Mason } 26211e701a32SChris Mason } else { 26221e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 26231e701a32SChris Mason range->len = (u64)-1; 26241e701a32SChris Mason } 2625496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 26264cb5300bSChris Mason range, 0, 0); 26274cb5300bSChris Mason if (ret > 0) 26284cb5300bSChris Mason ret = 0; 26291e701a32SChris Mason kfree(range); 2630f46b5a66SChristoph Hellwig break; 26318929ecfaSYan, Zheng default: 26328929ecfaSYan, Zheng ret = -EINVAL; 2633f46b5a66SChristoph Hellwig } 2634e441d54dSChris Mason out: 263525122d15SIlya Dryomov mnt_drop_write_file(file); 2636e441d54dSChris Mason return ret; 2637f46b5a66SChristoph Hellwig } 2638f46b5a66SChristoph Hellwig 2639b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2640f46b5a66SChristoph Hellwig { 2641f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2642f46b5a66SChristoph Hellwig int ret; 2643f46b5a66SChristoph Hellwig 2644e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2645e441d54dSChris Mason return -EPERM; 2646e441d54dSChris Mason 26475ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26485ac00addSStefan Behrens 1)) { 2649e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2650c9e9f97bSIlya Dryomov } 2651c9e9f97bSIlya Dryomov 26525ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2653dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2654c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2655c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2656c9e9f97bSIlya Dryomov goto out; 2657c9e9f97bSIlya Dryomov } 2658f46b5a66SChristoph Hellwig 26595516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2660f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2661f46b5a66SChristoph Hellwig 266243d20761SAnand Jain if (!ret) 266343d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 266443d20761SAnand Jain 2665f46b5a66SChristoph Hellwig kfree(vol_args); 2666c9e9f97bSIlya Dryomov out: 2667c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26685ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2669f46b5a66SChristoph Hellwig return ret; 2670f46b5a66SChristoph Hellwig } 2671f46b5a66SChristoph Hellwig 2672da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2673f46b5a66SChristoph Hellwig { 2674496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2675f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2676f46b5a66SChristoph Hellwig int ret; 2677f46b5a66SChristoph Hellwig 2678e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2679e441d54dSChris Mason return -EPERM; 2680e441d54dSChris Mason 2681da24927bSMiao Xie ret = mnt_want_write_file(file); 2682da24927bSMiao Xie if (ret) 2683da24927bSMiao Xie return ret; 2684c146afadSYan Zheng 2685dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2686c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2687c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2688c47ca32dSDan Carpenter goto err_drop; 2689c9e9f97bSIlya Dryomov } 2690f46b5a66SChristoph Hellwig 26915516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2692f46b5a66SChristoph Hellwig 2693183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2694183860f6SAnand Jain 1)) { 2695183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2696183860f6SAnand Jain goto out; 2697183860f6SAnand Jain } 2698183860f6SAnand Jain 2699183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2700183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2701c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 27025ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2703183860f6SAnand Jain 2704ec95d491SAnand Jain if (!ret) 2705ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2706ec95d491SAnand Jain 2707183860f6SAnand Jain out: 2708183860f6SAnand Jain kfree(vol_args); 2709c47ca32dSDan Carpenter err_drop: 27104ac20c70SIlya Dryomov mnt_drop_write_file(file); 2711f46b5a66SChristoph Hellwig return ret; 2712f46b5a66SChristoph Hellwig } 2713f46b5a66SChristoph Hellwig 2714475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2715475f6387SJan Schmidt { 2716027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2717475f6387SJan Schmidt struct btrfs_device *device; 2718475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2719027ed2f0SLi Zefan int ret = 0; 2720475f6387SJan Schmidt 2721027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2722027ed2f0SLi Zefan if (!fi_args) 2723027ed2f0SLi Zefan return -ENOMEM; 2724027ed2f0SLi Zefan 2725f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2726027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2727027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2728475f6387SJan Schmidt 2729d7641a49SByongho Lee list_for_each_entry(device, &fs_devices->devices, dev_list) { 2730027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2731027ed2f0SLi Zefan fi_args->max_id = device->devid; 2732475f6387SJan Schmidt } 2733475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2734475f6387SJan Schmidt 273580a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 273680a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 273780a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 273880a773fbSDavid Sterba 2739027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2740027ed2f0SLi Zefan ret = -EFAULT; 2741475f6387SJan Schmidt 2742027ed2f0SLi Zefan kfree(fi_args); 2743027ed2f0SLi Zefan return ret; 2744475f6387SJan Schmidt } 2745475f6387SJan Schmidt 2746475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2747475f6387SJan Schmidt { 2748475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2749475f6387SJan Schmidt struct btrfs_device *dev; 2750475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2751475f6387SJan Schmidt int ret = 0; 2752475f6387SJan Schmidt char *s_uuid = NULL; 2753475f6387SJan Schmidt 2754475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2755475f6387SJan Schmidt if (IS_ERR(di_args)) 2756475f6387SJan Schmidt return PTR_ERR(di_args); 2757475f6387SJan Schmidt 2758dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2759475f6387SJan Schmidt s_uuid = di_args->uuid; 2760475f6387SJan Schmidt 2761475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2762aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2763475f6387SJan Schmidt 2764475f6387SJan Schmidt if (!dev) { 2765475f6387SJan Schmidt ret = -ENODEV; 2766475f6387SJan Schmidt goto out; 2767475f6387SJan Schmidt } 2768475f6387SJan Schmidt 2769475f6387SJan Schmidt di_args->devid = dev->devid; 27707cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27717cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2772475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2773a27202fbSJim Meyering if (dev->name) { 2774606686eeSJosef Bacik struct rcu_string *name; 2775606686eeSJosef Bacik 2776606686eeSJosef Bacik rcu_read_lock(); 2777606686eeSJosef Bacik name = rcu_dereference(dev->name); 2778606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2779606686eeSJosef Bacik rcu_read_unlock(); 2780a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2781a27202fbSJim Meyering } else { 278299ba55adSStefan Behrens di_args->path[0] = '\0'; 2783a27202fbSJim Meyering } 2784475f6387SJan Schmidt 2785475f6387SJan Schmidt out: 278655793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2787475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2788475f6387SJan Schmidt ret = -EFAULT; 2789475f6387SJan Schmidt 2790475f6387SJan Schmidt kfree(di_args); 2791475f6387SJan Schmidt return ret; 2792475f6387SJan Schmidt } 2793475f6387SJan Schmidt 2794f4414602SMark Fasheh static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) 2795416161dbSMark Fasheh { 2796416161dbSMark Fasheh struct page *page; 2797416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2798416161dbSMark Fasheh 2799416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2800416161dbSMark Fasheh if (!page) 2801416161dbSMark Fasheh return NULL; 2802416161dbSMark Fasheh 2803416161dbSMark Fasheh if (!PageUptodate(page)) { 2804416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2805416161dbSMark Fasheh 0)) 2806416161dbSMark Fasheh return NULL; 2807416161dbSMark Fasheh lock_page(page); 2808416161dbSMark Fasheh if (!PageUptodate(page)) { 2809416161dbSMark Fasheh unlock_page(page); 2810416161dbSMark Fasheh page_cache_release(page); 2811416161dbSMark Fasheh return NULL; 2812416161dbSMark Fasheh } 2813416161dbSMark Fasheh } 2814416161dbSMark Fasheh unlock_page(page); 2815416161dbSMark Fasheh 2816416161dbSMark Fasheh return page; 2817416161dbSMark Fasheh } 2818416161dbSMark Fasheh 2819f4414602SMark Fasheh static int gather_extent_pages(struct inode *inode, struct page **pages, 2820f4414602SMark Fasheh int num_pages, u64 off) 2821f4414602SMark Fasheh { 2822f4414602SMark Fasheh int i; 2823f4414602SMark Fasheh pgoff_t index = off >> PAGE_CACHE_SHIFT; 2824f4414602SMark Fasheh 2825f4414602SMark Fasheh for (i = 0; i < num_pages; i++) { 2826f4414602SMark Fasheh pages[i] = extent_same_get_page(inode, index + i); 2827f4414602SMark Fasheh if (!pages[i]) 2828f4414602SMark Fasheh return -ENOMEM; 2829f4414602SMark Fasheh } 2830f4414602SMark Fasheh return 0; 2831f4414602SMark Fasheh } 2832f4414602SMark Fasheh 283377fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 283477fe20dcSMark Fasheh { 283577fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 283677fe20dcSMark Fasheh another, and lock file content */ 283777fe20dcSMark Fasheh while (1) { 283877fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 283977fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 284077fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 284177fe20dcSMark Fasheh off + len - 1); 2842ff5df9b8SFilipe Manana if ((!ordered || 2843ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2844ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 284577fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2846ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2847ff5df9b8SFilipe Manana if (ordered) 2848ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 284977fe20dcSMark Fasheh break; 2850ff5df9b8SFilipe Manana } 285177fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 285277fe20dcSMark Fasheh if (ordered) 285377fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 285477fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 285577fe20dcSMark Fasheh } 285677fe20dcSMark Fasheh } 285777fe20dcSMark Fasheh 2858f4414602SMark Fasheh static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) 2859416161dbSMark Fasheh { 28605955102cSAl Viro inode_unlock(inode1); 28615955102cSAl Viro inode_unlock(inode2); 2862416161dbSMark Fasheh } 2863416161dbSMark Fasheh 2864f4414602SMark Fasheh static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) 2865f4414602SMark Fasheh { 2866f4414602SMark Fasheh if (inode1 < inode2) 2867f4414602SMark Fasheh swap(inode1, inode2); 2868f4414602SMark Fasheh 28695955102cSAl Viro inode_lock_nested(inode1, I_MUTEX_PARENT); 28705955102cSAl Viro inode_lock_nested(inode2, I_MUTEX_CHILD); 2871f4414602SMark Fasheh } 2872f4414602SMark Fasheh 2873f4414602SMark Fasheh static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, 2874f4414602SMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2875f4414602SMark Fasheh { 2876f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2877f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2878f4414602SMark Fasheh } 2879f4414602SMark Fasheh 2880f4414602SMark Fasheh static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1, 2881416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2882416161dbSMark Fasheh { 2883416161dbSMark Fasheh if (inode1 < inode2) { 2884416161dbSMark Fasheh swap(inode1, inode2); 2885416161dbSMark Fasheh swap(loff1, loff2); 2886416161dbSMark Fasheh } 2887416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2888416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2889416161dbSMark Fasheh } 2890f4414602SMark Fasheh 2891f4414602SMark Fasheh struct cmp_pages { 2892f4414602SMark Fasheh int num_pages; 2893f4414602SMark Fasheh struct page **src_pages; 2894f4414602SMark Fasheh struct page **dst_pages; 2895f4414602SMark Fasheh }; 2896f4414602SMark Fasheh 2897f4414602SMark Fasheh static void btrfs_cmp_data_free(struct cmp_pages *cmp) 2898f4414602SMark Fasheh { 2899f4414602SMark Fasheh int i; 2900f4414602SMark Fasheh struct page *pg; 2901f4414602SMark Fasheh 2902f4414602SMark Fasheh for (i = 0; i < cmp->num_pages; i++) { 2903f4414602SMark Fasheh pg = cmp->src_pages[i]; 2904f4414602SMark Fasheh if (pg) 2905f4414602SMark Fasheh page_cache_release(pg); 2906f4414602SMark Fasheh pg = cmp->dst_pages[i]; 2907f4414602SMark Fasheh if (pg) 2908f4414602SMark Fasheh page_cache_release(pg); 2909f4414602SMark Fasheh } 2910f4414602SMark Fasheh kfree(cmp->src_pages); 2911f4414602SMark Fasheh kfree(cmp->dst_pages); 2912f4414602SMark Fasheh } 2913f4414602SMark Fasheh 2914f4414602SMark Fasheh static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, 2915f4414602SMark Fasheh struct inode *dst, u64 dst_loff, 2916f4414602SMark Fasheh u64 len, struct cmp_pages *cmp) 2917f4414602SMark Fasheh { 2918f4414602SMark Fasheh int ret; 2919f4414602SMark Fasheh int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT; 2920f4414602SMark Fasheh struct page **src_pgarr, **dst_pgarr; 2921f4414602SMark Fasheh 2922f4414602SMark Fasheh /* 2923f4414602SMark Fasheh * We must gather up all the pages before we initiate our 2924f4414602SMark Fasheh * extent locking. We use an array for the page pointers. Size 2925f4414602SMark Fasheh * of the array is bounded by len, which is in turn bounded by 2926f4414602SMark Fasheh * BTRFS_MAX_DEDUPE_LEN. 2927f4414602SMark Fasheh */ 2928f4414602SMark Fasheh src_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); 2929f4414602SMark Fasheh dst_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); 2930f4414602SMark Fasheh if (!src_pgarr || !dst_pgarr) { 2931f4414602SMark Fasheh kfree(src_pgarr); 2932f4414602SMark Fasheh kfree(dst_pgarr); 2933f4414602SMark Fasheh return -ENOMEM; 2934f4414602SMark Fasheh } 2935f4414602SMark Fasheh cmp->num_pages = num_pages; 2936f4414602SMark Fasheh cmp->src_pages = src_pgarr; 2937f4414602SMark Fasheh cmp->dst_pages = dst_pgarr; 2938f4414602SMark Fasheh 2939f4414602SMark Fasheh ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); 2940f4414602SMark Fasheh if (ret) 2941f4414602SMark Fasheh goto out; 2942f4414602SMark Fasheh 2943f4414602SMark Fasheh ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); 2944f4414602SMark Fasheh 2945f4414602SMark Fasheh out: 2946f4414602SMark Fasheh if (ret) 2947f4414602SMark Fasheh btrfs_cmp_data_free(cmp); 2948f4414602SMark Fasheh return 0; 2949416161dbSMark Fasheh } 2950416161dbSMark Fasheh 2951416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2952f4414602SMark Fasheh u64 dst_loff, u64 len, struct cmp_pages *cmp) 2953416161dbSMark Fasheh { 2954416161dbSMark Fasheh int ret = 0; 2955f4414602SMark Fasheh int i; 2956416161dbSMark Fasheh struct page *src_page, *dst_page; 2957416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2958416161dbSMark Fasheh void *addr, *dst_addr; 2959416161dbSMark Fasheh 2960f4414602SMark Fasheh i = 0; 2961416161dbSMark Fasheh while (len) { 2962416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2963416161dbSMark Fasheh cmp_len = len; 2964416161dbSMark Fasheh 2965f4414602SMark Fasheh BUG_ON(i >= cmp->num_pages); 2966f4414602SMark Fasheh 2967f4414602SMark Fasheh src_page = cmp->src_pages[i]; 2968f4414602SMark Fasheh dst_page = cmp->dst_pages[i]; 2969f4414602SMark Fasheh 2970416161dbSMark Fasheh addr = kmap_atomic(src_page); 2971416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2972416161dbSMark Fasheh 2973416161dbSMark Fasheh flush_dcache_page(src_page); 2974416161dbSMark Fasheh flush_dcache_page(dst_page); 2975416161dbSMark Fasheh 2976416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 29772b3909f8SDarrick J. Wong ret = -EBADE; 2978416161dbSMark Fasheh 2979416161dbSMark Fasheh kunmap_atomic(addr); 2980416161dbSMark Fasheh kunmap_atomic(dst_addr); 2981416161dbSMark Fasheh 2982416161dbSMark Fasheh if (ret) 2983416161dbSMark Fasheh break; 2984416161dbSMark Fasheh 2985416161dbSMark Fasheh len -= cmp_len; 2986f4414602SMark Fasheh i++; 2987416161dbSMark Fasheh } 2988416161dbSMark Fasheh 2989416161dbSMark Fasheh return ret; 2990416161dbSMark Fasheh } 2991416161dbSMark Fasheh 2992e1d227a4SMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, 2993e1d227a4SMark Fasheh u64 olen) 2994416161dbSMark Fasheh { 2995e1d227a4SMark Fasheh u64 len = *plen; 2996416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2997416161dbSMark Fasheh 2998e1d227a4SMark Fasheh if (off + olen > inode->i_size || off + olen < off) 2999416161dbSMark Fasheh return -EINVAL; 3000e1d227a4SMark Fasheh 3001e1d227a4SMark Fasheh /* if we extend to eof, continue to block boundary */ 3002e1d227a4SMark Fasheh if (off + len == inode->i_size) 3003e1d227a4SMark Fasheh *plen = len = ALIGN(inode->i_size, bs) - off; 3004e1d227a4SMark Fasheh 3005416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 3006416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 3007416161dbSMark Fasheh return -EINVAL; 3008416161dbSMark Fasheh 3009416161dbSMark Fasheh return 0; 3010416161dbSMark Fasheh } 3011416161dbSMark Fasheh 3012e1d227a4SMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 3013416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 3014416161dbSMark Fasheh { 3015416161dbSMark Fasheh int ret; 3016e1d227a4SMark Fasheh u64 len = olen; 3017f4414602SMark Fasheh struct cmp_pages cmp; 30180efa9f48SMark Fasheh int same_inode = 0; 30190efa9f48SMark Fasheh u64 same_lock_start = 0; 30200efa9f48SMark Fasheh u64 same_lock_len = 0; 3021416161dbSMark Fasheh 3022416161dbSMark Fasheh if (src == dst) 30230efa9f48SMark Fasheh same_inode = 1; 3024416161dbSMark Fasheh 3025113e8283SFilipe Manana if (len == 0) 3026113e8283SFilipe Manana return 0; 3027113e8283SFilipe Manana 30280efa9f48SMark Fasheh if (same_inode) { 30295955102cSAl Viro inode_lock(src); 30300efa9f48SMark Fasheh 30310efa9f48SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 30320efa9f48SMark Fasheh if (ret) 30330efa9f48SMark Fasheh goto out_unlock; 30340efa9f48SMark Fasheh 30350efa9f48SMark Fasheh /* 30360efa9f48SMark Fasheh * Single inode case wants the same checks, except we 30370efa9f48SMark Fasheh * don't want our length pushed out past i_size as 30380efa9f48SMark Fasheh * comparing that data range makes no sense. 30390efa9f48SMark Fasheh * 30400efa9f48SMark Fasheh * extent_same_check_offsets() will do this for an 30410efa9f48SMark Fasheh * unaligned length at i_size, so catch it here and 30420efa9f48SMark Fasheh * reject the request. 30430efa9f48SMark Fasheh * 30440efa9f48SMark Fasheh * This effectively means we require aligned extents 30450efa9f48SMark Fasheh * for the single-inode case, whereas the other cases 30460efa9f48SMark Fasheh * allow an unaligned length so long as it ends at 30470efa9f48SMark Fasheh * i_size. 30480efa9f48SMark Fasheh */ 30490efa9f48SMark Fasheh if (len != olen) { 30500efa9f48SMark Fasheh ret = -EINVAL; 30510efa9f48SMark Fasheh goto out_unlock; 30520efa9f48SMark Fasheh } 30530efa9f48SMark Fasheh 30540efa9f48SMark Fasheh /* Check for overlapping ranges */ 30550efa9f48SMark Fasheh if (dst_loff + len > loff && dst_loff < loff + len) { 30560efa9f48SMark Fasheh ret = -EINVAL; 30570efa9f48SMark Fasheh goto out_unlock; 30580efa9f48SMark Fasheh } 30590efa9f48SMark Fasheh 30600efa9f48SMark Fasheh same_lock_start = min_t(u64, loff, dst_loff); 30610efa9f48SMark Fasheh same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; 30620efa9f48SMark Fasheh } else { 3063f4414602SMark Fasheh btrfs_double_inode_lock(src, dst); 3064416161dbSMark Fasheh 3065e1d227a4SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 3066416161dbSMark Fasheh if (ret) 3067416161dbSMark Fasheh goto out_unlock; 3068416161dbSMark Fasheh 3069e1d227a4SMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, &len, olen); 3070416161dbSMark Fasheh if (ret) 3071416161dbSMark Fasheh goto out_unlock; 30720efa9f48SMark Fasheh } 3073416161dbSMark Fasheh 3074416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 3075416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 3076416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 3077416161dbSMark Fasheh ret = -EINVAL; 3078416161dbSMark Fasheh goto out_unlock; 3079416161dbSMark Fasheh } 3080416161dbSMark Fasheh 3081f4414602SMark Fasheh ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); 3082f4414602SMark Fasheh if (ret) 3083f4414602SMark Fasheh goto out_unlock; 3084f4414602SMark Fasheh 30850efa9f48SMark Fasheh if (same_inode) 30860efa9f48SMark Fasheh lock_extent_range(src, same_lock_start, same_lock_len); 30870efa9f48SMark Fasheh else 3088f4414602SMark Fasheh btrfs_double_extent_lock(src, loff, dst, dst_loff, len); 3089f4414602SMark Fasheh 3090207910ddSMark Fasheh /* pass original length for comparison so we stay within i_size */ 3091f4414602SMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); 3092416161dbSMark Fasheh if (ret == 0) 30931c919a5eSMark Fasheh ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); 3094416161dbSMark Fasheh 30950efa9f48SMark Fasheh if (same_inode) 30960efa9f48SMark Fasheh unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, 30970efa9f48SMark Fasheh same_lock_start + same_lock_len - 1); 30980efa9f48SMark Fasheh else 3099f4414602SMark Fasheh btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); 3100f4414602SMark Fasheh 3101f4414602SMark Fasheh btrfs_cmp_data_free(&cmp); 3102416161dbSMark Fasheh out_unlock: 31030efa9f48SMark Fasheh if (same_inode) 31045955102cSAl Viro inode_unlock(src); 31050efa9f48SMark Fasheh else 3106f4414602SMark Fasheh btrfs_double_inode_unlock(src, dst); 3107416161dbSMark Fasheh 3108416161dbSMark Fasheh return ret; 3109416161dbSMark Fasheh } 3110416161dbSMark Fasheh 3111ee22184bSByongho Lee #define BTRFS_MAX_DEDUPE_LEN SZ_16M 3112416161dbSMark Fasheh 31132b3909f8SDarrick J. Wong ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, 31142b3909f8SDarrick J. Wong struct file *dst_file, u64 dst_loff) 3115416161dbSMark Fasheh { 31162b3909f8SDarrick J. Wong struct inode *src = file_inode(src_file); 31172b3909f8SDarrick J. Wong struct inode *dst = file_inode(dst_file); 3118416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 31192b3909f8SDarrick J. Wong ssize_t res; 3120416161dbSMark Fasheh 31212b3909f8SDarrick J. Wong if (olen > BTRFS_MAX_DEDUPE_LEN) 31222b3909f8SDarrick J. Wong olen = BTRFS_MAX_DEDUPE_LEN; 3123416161dbSMark Fasheh 3124416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 3125416161dbSMark Fasheh /* 3126416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 3127416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 3128416161dbSMark Fasheh * this situation without an update. 3129416161dbSMark Fasheh */ 31302b3909f8SDarrick J. Wong return -EINVAL; 3131416161dbSMark Fasheh } 3132416161dbSMark Fasheh 31332b3909f8SDarrick J. Wong res = btrfs_extent_same(src, loff, olen, dst, dst_loff); 31342b3909f8SDarrick J. Wong if (res) 31352b3909f8SDarrick J. Wong return res; 31362b3909f8SDarrick J. Wong return olen; 3137416161dbSMark Fasheh } 3138416161dbSMark Fasheh 3139f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3140f82a9901SFilipe Manana struct inode *inode, 3141f82a9901SFilipe Manana u64 endoff, 3142f82a9901SFilipe Manana const u64 destoff, 31431c919a5eSMark Fasheh const u64 olen, 31441c919a5eSMark Fasheh int no_time_update) 3145f82a9901SFilipe Manana { 3146f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3147f82a9901SFilipe Manana int ret; 3148f82a9901SFilipe Manana 3149f82a9901SFilipe Manana inode_inc_iversion(inode); 31501c919a5eSMark Fasheh if (!no_time_update) 3151f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3152f82a9901SFilipe Manana /* 3153f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3154f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3155f82a9901SFilipe Manana */ 3156f82a9901SFilipe Manana if (endoff > destoff + olen) 3157f82a9901SFilipe Manana endoff = destoff + olen; 3158f82a9901SFilipe Manana if (endoff > inode->i_size) 3159f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3160f82a9901SFilipe Manana 3161f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3162f82a9901SFilipe Manana if (ret) { 3163f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3164f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3165f82a9901SFilipe Manana goto out; 3166f82a9901SFilipe Manana } 3167f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3168f82a9901SFilipe Manana out: 3169f82a9901SFilipe Manana return ret; 3170f82a9901SFilipe Manana } 3171f82a9901SFilipe Manana 31727ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 31737ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 31747ffbb598SFilipe Manana const struct btrfs_path *path, 31757ffbb598SFilipe Manana const u64 hole_offset, 31767ffbb598SFilipe Manana const u64 hole_len) 31777ffbb598SFilipe Manana { 31787ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 31797ffbb598SFilipe Manana struct extent_map *em; 31807ffbb598SFilipe Manana int ret; 31817ffbb598SFilipe Manana 31827ffbb598SFilipe Manana em = alloc_extent_map(); 31837ffbb598SFilipe Manana if (!em) { 31847ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31857ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31867ffbb598SFilipe Manana return; 31877ffbb598SFilipe Manana } 31887ffbb598SFilipe Manana 318914f59796SFilipe Manana if (path) { 319014f59796SFilipe Manana struct btrfs_file_extent_item *fi; 319114f59796SFilipe Manana 319214f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 319314f59796SFilipe Manana struct btrfs_file_extent_item); 31947ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 31957ffbb598SFilipe Manana em->generation = -1; 31967ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 31977ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 31987ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31997ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32007ffbb598SFilipe Manana } else { 32017ffbb598SFilipe Manana em->start = hole_offset; 32027ffbb598SFilipe Manana em->len = hole_len; 32037ffbb598SFilipe Manana em->ram_bytes = em->len; 32047ffbb598SFilipe Manana em->orig_start = hole_offset; 32057ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 32067ffbb598SFilipe Manana em->block_len = 0; 32077ffbb598SFilipe Manana em->orig_block_len = 0; 32087ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 32097ffbb598SFilipe Manana em->generation = trans->transid; 32107ffbb598SFilipe Manana } 32117ffbb598SFilipe Manana 32127ffbb598SFilipe Manana while (1) { 32137ffbb598SFilipe Manana write_lock(&em_tree->lock); 32147ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 32157ffbb598SFilipe Manana write_unlock(&em_tree->lock); 32167ffbb598SFilipe Manana if (ret != -EEXIST) { 32177ffbb598SFilipe Manana free_extent_map(em); 32187ffbb598SFilipe Manana break; 32197ffbb598SFilipe Manana } 32207ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 32217ffbb598SFilipe Manana em->start + em->len - 1, 0); 32227ffbb598SFilipe Manana } 32237ffbb598SFilipe Manana 3224ee39b432SDavid Sterba if (ret) 32257ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32267ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32277ffbb598SFilipe Manana } 32287ffbb598SFilipe Manana 32298039d87dSFilipe Manana /* 32308039d87dSFilipe Manana * Make sure we do not end up inserting an inline extent into a file that has 32318039d87dSFilipe Manana * already other (non-inline) extents. If a file has an inline extent it can 32328039d87dSFilipe Manana * not have any other extents and the (single) inline extent must start at the 32338039d87dSFilipe Manana * file offset 0. Failing to respect these rules will lead to file corruption, 32348039d87dSFilipe Manana * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc 32358039d87dSFilipe Manana * 32368039d87dSFilipe Manana * We can have extents that have been already written to disk or we can have 32378039d87dSFilipe Manana * dirty ranges still in delalloc, in which case the extent maps and items are 32388039d87dSFilipe Manana * created only when we run delalloc, and the delalloc ranges might fall outside 32398039d87dSFilipe Manana * the range we are currently locking in the inode's io tree. So we check the 32408039d87dSFilipe Manana * inode's i_size because of that (i_size updates are done while holding the 32418039d87dSFilipe Manana * i_mutex, which we are holding here). 32428039d87dSFilipe Manana * We also check to see if the inode has a size not greater than "datal" but has 32438039d87dSFilipe Manana * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are 32448039d87dSFilipe Manana * protected against such concurrent fallocate calls by the i_mutex). 32458039d87dSFilipe Manana * 32468039d87dSFilipe Manana * If the file has no extents but a size greater than datal, do not allow the 32478039d87dSFilipe Manana * copy because we would need turn the inline extent into a non-inline one (even 32488039d87dSFilipe Manana * with NO_HOLES enabled). If we find our destination inode only has one inline 32498039d87dSFilipe Manana * extent, just overwrite it with the source inline extent if its size is less 32508039d87dSFilipe Manana * than the source extent's size, or we could copy the source inline extent's 32518039d87dSFilipe Manana * data into the destination inode's inline extent if the later is greater then 32528039d87dSFilipe Manana * the former. 32538039d87dSFilipe Manana */ 32548039d87dSFilipe Manana static int clone_copy_inline_extent(struct inode *src, 32558039d87dSFilipe Manana struct inode *dst, 32568039d87dSFilipe Manana struct btrfs_trans_handle *trans, 32578039d87dSFilipe Manana struct btrfs_path *path, 32588039d87dSFilipe Manana struct btrfs_key *new_key, 32598039d87dSFilipe Manana const u64 drop_start, 32608039d87dSFilipe Manana const u64 datal, 32618039d87dSFilipe Manana const u64 skip, 32628039d87dSFilipe Manana const u64 size, 32638039d87dSFilipe Manana char *inline_data) 32648039d87dSFilipe Manana { 32658039d87dSFilipe Manana struct btrfs_root *root = BTRFS_I(dst)->root; 32668039d87dSFilipe Manana const u64 aligned_end = ALIGN(new_key->offset + datal, 32678039d87dSFilipe Manana root->sectorsize); 32688039d87dSFilipe Manana int ret; 32698039d87dSFilipe Manana struct btrfs_key key; 32708039d87dSFilipe Manana 32718039d87dSFilipe Manana if (new_key->offset > 0) 32728039d87dSFilipe Manana return -EOPNOTSUPP; 32738039d87dSFilipe Manana 32748039d87dSFilipe Manana key.objectid = btrfs_ino(dst); 32758039d87dSFilipe Manana key.type = BTRFS_EXTENT_DATA_KEY; 32768039d87dSFilipe Manana key.offset = 0; 32778039d87dSFilipe Manana ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 32788039d87dSFilipe Manana if (ret < 0) { 32798039d87dSFilipe Manana return ret; 32808039d87dSFilipe Manana } else if (ret > 0) { 32818039d87dSFilipe Manana if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 32828039d87dSFilipe Manana ret = btrfs_next_leaf(root, path); 32838039d87dSFilipe Manana if (ret < 0) 32848039d87dSFilipe Manana return ret; 32858039d87dSFilipe Manana else if (ret > 0) 32868039d87dSFilipe Manana goto copy_inline_extent; 32878039d87dSFilipe Manana } 32888039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 32898039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 32908039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) { 32918039d87dSFilipe Manana ASSERT(key.offset > 0); 32928039d87dSFilipe Manana return -EOPNOTSUPP; 32938039d87dSFilipe Manana } 32948039d87dSFilipe Manana } else if (i_size_read(dst) <= datal) { 32958039d87dSFilipe Manana struct btrfs_file_extent_item *ei; 32968039d87dSFilipe Manana u64 ext_len; 32978039d87dSFilipe Manana 32988039d87dSFilipe Manana /* 32998039d87dSFilipe Manana * If the file size is <= datal, make sure there are no other 33008039d87dSFilipe Manana * extents following (can happen do to an fallocate call with 33018039d87dSFilipe Manana * the flag FALLOC_FL_KEEP_SIZE). 33028039d87dSFilipe Manana */ 33038039d87dSFilipe Manana ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 33048039d87dSFilipe Manana struct btrfs_file_extent_item); 33058039d87dSFilipe Manana /* 33068039d87dSFilipe Manana * If it's an inline extent, it can not have other extents 33078039d87dSFilipe Manana * following it. 33088039d87dSFilipe Manana */ 33098039d87dSFilipe Manana if (btrfs_file_extent_type(path->nodes[0], ei) == 33108039d87dSFilipe Manana BTRFS_FILE_EXTENT_INLINE) 33118039d87dSFilipe Manana goto copy_inline_extent; 33128039d87dSFilipe Manana 33138039d87dSFilipe Manana ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); 33148039d87dSFilipe Manana if (ext_len > aligned_end) 33158039d87dSFilipe Manana return -EOPNOTSUPP; 33168039d87dSFilipe Manana 33178039d87dSFilipe Manana ret = btrfs_next_item(root, path); 33188039d87dSFilipe Manana if (ret < 0) { 33198039d87dSFilipe Manana return ret; 33208039d87dSFilipe Manana } else if (ret == 0) { 33218039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 33228039d87dSFilipe Manana path->slots[0]); 33238039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 33248039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) 33258039d87dSFilipe Manana return -EOPNOTSUPP; 33268039d87dSFilipe Manana } 33278039d87dSFilipe Manana } 33288039d87dSFilipe Manana 33298039d87dSFilipe Manana copy_inline_extent: 33308039d87dSFilipe Manana /* 33318039d87dSFilipe Manana * We have no extent items, or we have an extent at offset 0 which may 33328039d87dSFilipe Manana * or may not be inlined. All these cases are dealt the same way. 33338039d87dSFilipe Manana */ 33348039d87dSFilipe Manana if (i_size_read(dst) > datal) { 33358039d87dSFilipe Manana /* 33368039d87dSFilipe Manana * If the destination inode has an inline extent... 33378039d87dSFilipe Manana * This would require copying the data from the source inline 33388039d87dSFilipe Manana * extent into the beginning of the destination's inline extent. 33398039d87dSFilipe Manana * But this is really complex, both extents can be compressed 33408039d87dSFilipe Manana * or just one of them, which would require decompressing and 33418039d87dSFilipe Manana * re-compressing data (which could increase the new compressed 33428039d87dSFilipe Manana * size, not allowing the compressed data to fit anymore in an 33438039d87dSFilipe Manana * inline extent). 33448039d87dSFilipe Manana * So just don't support this case for now (it should be rare, 33458039d87dSFilipe Manana * we are not really saving space when cloning inline extents). 33468039d87dSFilipe Manana */ 33478039d87dSFilipe Manana return -EOPNOTSUPP; 33488039d87dSFilipe Manana } 33498039d87dSFilipe Manana 33508039d87dSFilipe Manana btrfs_release_path(path); 33518039d87dSFilipe Manana ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); 33528039d87dSFilipe Manana if (ret) 33538039d87dSFilipe Manana return ret; 33548039d87dSFilipe Manana ret = btrfs_insert_empty_item(trans, root, path, new_key, size); 33558039d87dSFilipe Manana if (ret) 33568039d87dSFilipe Manana return ret; 33578039d87dSFilipe Manana 33588039d87dSFilipe Manana if (skip) { 33598039d87dSFilipe Manana const u32 start = btrfs_file_extent_calc_inline_size(0); 33608039d87dSFilipe Manana 33618039d87dSFilipe Manana memmove(inline_data + start, inline_data + start + skip, datal); 33628039d87dSFilipe Manana } 33638039d87dSFilipe Manana 33648039d87dSFilipe Manana write_extent_buffer(path->nodes[0], inline_data, 33658039d87dSFilipe Manana btrfs_item_ptr_offset(path->nodes[0], 33668039d87dSFilipe Manana path->slots[0]), 33678039d87dSFilipe Manana size); 33688039d87dSFilipe Manana inode_add_bytes(dst, datal); 33698039d87dSFilipe Manana 33708039d87dSFilipe Manana return 0; 33718039d87dSFilipe Manana } 33728039d87dSFilipe Manana 337332b7c687SMark Fasheh /** 337432b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 337532b7c687SMark Fasheh * 337632b7c687SMark Fasheh * @src: Inode to clone from 337732b7c687SMark Fasheh * @inode: Inode to clone to 337832b7c687SMark Fasheh * @off: Offset within source to start clone from 337932b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 33801c919a5eSMark Fasheh * @olen_aligned: Block-aligned value of olen 338132b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 33821c919a5eSMark Fasheh * @no_time_update: Whether to update mtime/ctime on the target inode 338332b7c687SMark Fasheh */ 338432b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3385f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 33861c919a5eSMark Fasheh const u64 destoff, int no_time_update) 3387f46b5a66SChristoph Hellwig { 3388f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 338932b7c687SMark Fasheh struct btrfs_path *path = NULL; 3390f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 339132b7c687SMark Fasheh struct btrfs_trans_handle *trans; 339232b7c687SMark Fasheh char *buf = NULL; 3393ae01a0abSYan Zheng struct btrfs_key key; 3394f46b5a66SChristoph Hellwig u32 nritems; 3395f46b5a66SChristoph Hellwig int slot; 3396ae01a0abSYan Zheng int ret; 3397f82a9901SFilipe Manana const u64 len = olen_aligned; 3398f82a9901SFilipe Manana u64 last_dest_end = destoff; 3399ae01a0abSYan Zheng 3400ae01a0abSYan Zheng ret = -ENOMEM; 3401707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3402ae01a0abSYan Zheng if (!buf) 340332b7c687SMark Fasheh return ret; 3404ae01a0abSYan Zheng 3405ae01a0abSYan Zheng path = btrfs_alloc_path(); 3406ae01a0abSYan Zheng if (!path) { 3407ae01a0abSYan Zheng vfree(buf); 340832b7c687SMark Fasheh return ret; 3409ae01a0abSYan Zheng } 341032b7c687SMark Fasheh 3411e4058b54SDavid Sterba path->reada = READA_FORWARD; 3412c5c9cd4dSSage Weil /* clone data */ 341333345d01SLi Zefan key.objectid = btrfs_ino(src); 3414ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 34152c463823SFilipe Manana key.offset = off; 3416f46b5a66SChristoph Hellwig 3417f46b5a66SChristoph Hellwig while (1) { 3418de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3419df858e76SFilipe Manana 3420f46b5a66SChristoph Hellwig /* 3421f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3422f46b5a66SChristoph Hellwig * tree. 3423f46b5a66SChristoph Hellwig */ 3424e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3425362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3426362a20c5SDavid Sterba 0, 0); 3427f46b5a66SChristoph Hellwig if (ret < 0) 3428f46b5a66SChristoph Hellwig goto out; 34292c463823SFilipe Manana /* 34302c463823SFilipe Manana * First search, if no extent item that starts at offset off was 34312c463823SFilipe Manana * found but the previous item is an extent item, it's possible 34322c463823SFilipe Manana * it might overlap our target range, therefore process it. 34332c463823SFilipe Manana */ 34342c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 34352c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 34362c463823SFilipe Manana path->slots[0] - 1); 34372c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 34382c463823SFilipe Manana path->slots[0]--; 34392c463823SFilipe Manana } 3440f46b5a66SChristoph Hellwig 3441ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3442e4355f34SFilipe David Borba Manana process_slot: 3443ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3444362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3445f46b5a66SChristoph Hellwig if (ret < 0) 3446f46b5a66SChristoph Hellwig goto out; 3447f46b5a66SChristoph Hellwig if (ret > 0) 3448f46b5a66SChristoph Hellwig break; 3449ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3450f46b5a66SChristoph Hellwig } 3451f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3452f46b5a66SChristoph Hellwig slot = path->slots[0]; 3453f46b5a66SChristoph Hellwig 3454ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3455962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 345633345d01SLi Zefan key.objectid != btrfs_ino(src)) 3457f46b5a66SChristoph Hellwig break; 3458f46b5a66SChristoph Hellwig 3459962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3460c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3461c5c9cd4dSSage Weil int type; 346231840ae1SZheng Yan u32 size; 346331840ae1SZheng Yan struct btrfs_key new_key; 3464c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3465c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3466c5c9cd4dSSage Weil u8 comp; 3467f82a9901SFilipe Manana u64 drop_start; 346831840ae1SZheng Yan 3469c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3470c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3471c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3472c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3473c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3474c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3475d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3476d397712bSChris Mason extent); 3477d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3478d397712bSChris Mason extent); 3479c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3480d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3481d397712bSChris Mason extent); 3482c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3483c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3484c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3485c5c9cd4dSSage Weil extent); 3486c5c9cd4dSSage Weil } 348731840ae1SZheng Yan 34882c463823SFilipe Manana /* 34892c463823SFilipe Manana * The first search might have left us at an extent 34902c463823SFilipe Manana * item that ends before our target range's start, can 34912c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 34922c463823SFilipe Manana */ 34932c463823SFilipe Manana if (key.offset + datal <= off) { 3494e4355f34SFilipe David Borba Manana path->slots[0]++; 3495e4355f34SFilipe David Borba Manana goto process_slot; 34962c463823SFilipe Manana } else if (key.offset >= off + len) { 34972c463823SFilipe Manana break; 3498e4355f34SFilipe David Borba Manana } 3499df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3500e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3501e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3502e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3503e4355f34SFilipe David Borba Manana size); 3504e4355f34SFilipe David Borba Manana 3505e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3506e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3507c5c9cd4dSSage Weil 350831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 350933345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 35104d728ec7SLi Zefan if (off <= key.offset) 3511c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 35124d728ec7SLi Zefan else 35134d728ec7SLi Zefan new_key.offset = destoff; 3514c5c9cd4dSSage Weil 3515b6f3409bSSage Weil /* 3516f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3517f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3518f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3519f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3520f82a9901SFilipe Manana * partially overlaps it). 3521f82a9901SFilipe Manana */ 3522f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3523f82a9901SFilipe Manana drop_start = last_dest_end; 3524f82a9901SFilipe Manana else 3525f82a9901SFilipe Manana drop_start = new_key.offset; 3526f82a9901SFilipe Manana 3527f82a9901SFilipe Manana /* 3528b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3529b6f3409bSSage Weil * 1 - add new extent 3530b6f3409bSSage Weil * 1 - inode update 3531b6f3409bSSage Weil */ 3532b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3533a22285a6SYan, Zheng if (IS_ERR(trans)) { 3534a22285a6SYan, Zheng ret = PTR_ERR(trans); 3535a22285a6SYan, Zheng goto out; 3536a22285a6SYan, Zheng } 3537a22285a6SYan, Zheng 3538c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3539c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3540d72c0842SLi Zefan /* 3541d72c0842SLi Zefan * a | --- range to clone ---| b 3542d72c0842SLi Zefan * | ------------- extent ------------- | 3543d72c0842SLi Zefan */ 3544d72c0842SLi Zefan 354593915584SAntonio Ospite /* subtract range b */ 3546d72c0842SLi Zefan if (key.offset + datal > off + len) 3547d72c0842SLi Zefan datal = off + len - key.offset; 3548d72c0842SLi Zefan 354993915584SAntonio Ospite /* subtract range a */ 3550a22285a6SYan, Zheng if (off > key.offset) { 3551a22285a6SYan, Zheng datao += off - key.offset; 3552a22285a6SYan, Zheng datal -= off - key.offset; 3553a22285a6SYan, Zheng } 3554a22285a6SYan, Zheng 35555dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3556f82a9901SFilipe Manana drop_start, 3557a22285a6SYan, Zheng new_key.offset + datal, 35582671485dSJosef Bacik 1); 355979787eaaSJeff Mahoney if (ret) { 35603f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 356100fdf13aSLiu Bo btrfs_abort_transaction(trans, 356200fdf13aSLiu Bo root, ret); 356379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 356479787eaaSJeff Mahoney goto out; 356579787eaaSJeff Mahoney } 3566a22285a6SYan, Zheng 356731840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 356831840ae1SZheng Yan &new_key, size); 356979787eaaSJeff Mahoney if (ret) { 357079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 357179787eaaSJeff Mahoney ret); 357279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 357379787eaaSJeff Mahoney goto out; 357479787eaaSJeff Mahoney } 357531840ae1SZheng Yan 357631840ae1SZheng Yan leaf = path->nodes[0]; 357731840ae1SZheng Yan slot = path->slots[0]; 357831840ae1SZheng Yan write_extent_buffer(leaf, buf, 357931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 358031840ae1SZheng Yan size); 3581ae01a0abSYan Zheng 3582f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3583f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3584c5c9cd4dSSage Weil 3585c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3586c5c9cd4dSSage Weil if (!disko) 3587c5c9cd4dSSage Weil datao = 0; 3588c5c9cd4dSSage Weil 3589c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3590c5c9cd4dSSage Weil datao); 3591c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3592c5c9cd4dSSage Weil datal); 3593fcebe456SJosef Bacik 3594c5c9cd4dSSage Weil if (disko) { 3595c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3596ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 35975d4f98a2SYan Zheng disko, diskl, 0, 3598f46b5a66SChristoph Hellwig root->root_key.objectid, 359933345d01SLi Zefan btrfs_ino(inode), 3600b06c4bf5SFilipe Manana new_key.offset - datao); 360179787eaaSJeff Mahoney if (ret) { 360279787eaaSJeff Mahoney btrfs_abort_transaction(trans, 360379787eaaSJeff Mahoney root, 360479787eaaSJeff Mahoney ret); 360579787eaaSJeff Mahoney btrfs_end_transaction(trans, 360679787eaaSJeff Mahoney root); 360779787eaaSJeff Mahoney goto out; 360879787eaaSJeff Mahoney 360979787eaaSJeff Mahoney } 3610f46b5a66SChristoph Hellwig } 3611c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3612c5c9cd4dSSage Weil u64 skip = 0; 3613c5c9cd4dSSage Weil u64 trim = 0; 3614ed958762SFilipe Manana 3615c5c9cd4dSSage Weil if (off > key.offset) { 3616c5c9cd4dSSage Weil skip = off - key.offset; 3617c5c9cd4dSSage Weil new_key.offset += skip; 361831840ae1SZheng Yan } 3619d397712bSChris Mason 3620c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3621c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3622d397712bSChris Mason 3623c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3624c5c9cd4dSSage Weil ret = -EINVAL; 3625a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3626c5c9cd4dSSage Weil goto out; 362731840ae1SZheng Yan } 3628c5c9cd4dSSage Weil size -= skip + trim; 3629c5c9cd4dSSage Weil datal -= skip + trim; 3630a22285a6SYan, Zheng 36318039d87dSFilipe Manana ret = clone_copy_inline_extent(src, inode, 36328039d87dSFilipe Manana trans, path, 36338039d87dSFilipe Manana &new_key, 3634f82a9901SFilipe Manana drop_start, 36358039d87dSFilipe Manana datal, 36368039d87dSFilipe Manana skip, size, buf); 363779787eaaSJeff Mahoney if (ret) { 36383f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 36393a29bc09SChris Mason btrfs_abort_transaction(trans, 36408039d87dSFilipe Manana root, 364179787eaaSJeff Mahoney ret); 364279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 364379787eaaSJeff Mahoney goto out; 364479787eaaSJeff Mahoney } 3645c5c9cd4dSSage Weil leaf = path->nodes[0]; 3646c5c9cd4dSSage Weil slot = path->slots[0]; 3647c5c9cd4dSSage Weil } 3648c5c9cd4dSSage Weil 36497ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 36507ffbb598SFilipe Manana if (drop_start < new_key.offset) 36517ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 365214f59796SFilipe Manana NULL, drop_start, 36537ffbb598SFilipe Manana new_key.offset - drop_start); 36547ffbb598SFilipe Manana 365514f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 36567ffbb598SFilipe Manana 3657c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3658b3b4aa74SDavid Sterba btrfs_release_path(path); 3659c5c9cd4dSSage Weil 366062e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 366162e2390eSFilipe Manana root->sectorsize); 3662f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3663f82a9901SFilipe Manana last_dest_end, 36641c919a5eSMark Fasheh destoff, olen, 36651c919a5eSMark Fasheh no_time_update); 3666f82a9901SFilipe Manana if (ret) 366779787eaaSJeff Mahoney goto out; 36682c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 36692c463823SFilipe Manana break; 3670a22285a6SYan, Zheng } 3671b3b4aa74SDavid Sterba btrfs_release_path(path); 3672df858e76SFilipe Manana key.offset = next_key_min_offset; 3673ae01a0abSYan Zheng } 3674f46b5a66SChristoph Hellwig ret = 0; 367532b7c687SMark Fasheh 3676f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3677f82a9901SFilipe Manana /* 3678f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3679f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3680f82a9901SFilipe Manana */ 3681b3b4aa74SDavid Sterba btrfs_release_path(path); 3682f82a9901SFilipe Manana 3683f82a9901SFilipe Manana /* 3684f82a9901SFilipe Manana * 1 - remove extent(s) 3685f82a9901SFilipe Manana * 1 - inode update 3686f82a9901SFilipe Manana */ 3687f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3688f82a9901SFilipe Manana if (IS_ERR(trans)) { 3689f82a9901SFilipe Manana ret = PTR_ERR(trans); 3690f82a9901SFilipe Manana goto out; 3691f82a9901SFilipe Manana } 3692f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3693f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3694f82a9901SFilipe Manana if (ret) { 3695f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3696f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3697f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3698f82a9901SFilipe Manana goto out; 3699f82a9901SFilipe Manana } 370014f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 370114f59796SFilipe Manana destoff + len - last_dest_end); 3702f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 37031c919a5eSMark Fasheh destoff, olen, no_time_update); 3704f82a9901SFilipe Manana } 3705f82a9901SFilipe Manana 3706f46b5a66SChristoph Hellwig out: 370732b7c687SMark Fasheh btrfs_free_path(path); 370832b7c687SMark Fasheh vfree(buf); 370932b7c687SMark Fasheh return ret; 371032b7c687SMark Fasheh } 371132b7c687SMark Fasheh 37123db11b2eSZach Brown static noinline int btrfs_clone_files(struct file *file, struct file *file_src, 371332b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 371432b7c687SMark Fasheh { 371554563d41SAl Viro struct inode *inode = file_inode(file); 37163db11b2eSZach Brown struct inode *src = file_inode(file_src); 371732b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 371832b7c687SMark Fasheh int ret; 371932b7c687SMark Fasheh u64 len = olen; 372032b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 37213db11b2eSZach Brown int same_inode = src == inode; 372232b7c687SMark Fasheh 372332b7c687SMark Fasheh /* 372432b7c687SMark Fasheh * TODO: 372532b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 372632b7c687SMark Fasheh * decompress into destination's address_space (the file offset 372732b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 372832b7c687SMark Fasheh * otherwise reinsert) a subrange. 372900fdf13aSLiu Bo * 373000fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 373100fdf13aSLiu Bo * be either compressed or non-compressed. 373232b7c687SMark Fasheh */ 373332b7c687SMark Fasheh 373432b7c687SMark Fasheh if (btrfs_root_readonly(root)) 373532b7c687SMark Fasheh return -EROFS; 373632b7c687SMark Fasheh 37373db11b2eSZach Brown if (file_src->f_path.mnt != file->f_path.mnt || 37383db11b2eSZach Brown src->i_sb != inode->i_sb) 37393db11b2eSZach Brown return -EXDEV; 374032b7c687SMark Fasheh 374132b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 374232b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 374332b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 37443db11b2eSZach Brown return -EINVAL; 374532b7c687SMark Fasheh 374632b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 37473db11b2eSZach Brown return -EISDIR; 374832b7c687SMark Fasheh 374932b7c687SMark Fasheh if (!same_inode) { 3750293a8489SMark Fasheh btrfs_double_inode_lock(src, inode); 375132b7c687SMark Fasheh } else { 37525955102cSAl Viro inode_lock(src); 375332b7c687SMark Fasheh } 375432b7c687SMark Fasheh 375532b7c687SMark Fasheh /* determine range to clone */ 375632b7c687SMark Fasheh ret = -EINVAL; 375732b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 375832b7c687SMark Fasheh goto out_unlock; 375932b7c687SMark Fasheh if (len == 0) 376032b7c687SMark Fasheh olen = len = src->i_size - off; 376132b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 376232b7c687SMark Fasheh if (off + len == src->i_size) 376332b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 376432b7c687SMark Fasheh 3765ccccf3d6SFilipe Manana if (len == 0) { 3766ccccf3d6SFilipe Manana ret = 0; 3767ccccf3d6SFilipe Manana goto out_unlock; 3768ccccf3d6SFilipe Manana } 3769ccccf3d6SFilipe Manana 377032b7c687SMark Fasheh /* verify the end result is block aligned */ 377132b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 377232b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 377332b7c687SMark Fasheh goto out_unlock; 377432b7c687SMark Fasheh 377532b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 377632b7c687SMark Fasheh if (same_inode) { 377732b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 377832b7c687SMark Fasheh goto out_unlock; 377932b7c687SMark Fasheh } 378032b7c687SMark Fasheh 378132b7c687SMark Fasheh if (destoff > inode->i_size) { 378232b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 378332b7c687SMark Fasheh if (ret) 378432b7c687SMark Fasheh goto out_unlock; 378532b7c687SMark Fasheh } 378632b7c687SMark Fasheh 3787c125b8bfSFilipe Manana /* 3788c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3789c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3790c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3791c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3792c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3793c125b8bfSFilipe Manana */ 3794c125b8bfSFilipe Manana if (same_inode) { 3795c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3796c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 379732b7c687SMark Fasheh 3798c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3799c125b8bfSFilipe Manana } else { 3800293a8489SMark Fasheh btrfs_double_extent_lock(src, off, inode, destoff, len); 3801c125b8bfSFilipe Manana } 380232b7c687SMark Fasheh 38031c919a5eSMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); 380432b7c687SMark Fasheh 3805c125b8bfSFilipe Manana if (same_inode) { 3806c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3807c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3808c125b8bfSFilipe Manana 3809c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3810c125b8bfSFilipe Manana } else { 3811293a8489SMark Fasheh btrfs_double_extent_unlock(src, off, inode, destoff, len); 3812c125b8bfSFilipe Manana } 3813c125b8bfSFilipe Manana /* 3814c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3815c125b8bfSFilipe Manana * data immediately and not the previous data. 3816c125b8bfSFilipe Manana */ 3817c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3818c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3819f46b5a66SChristoph Hellwig out_unlock: 3820293a8489SMark Fasheh if (!same_inode) 3821293a8489SMark Fasheh btrfs_double_inode_unlock(src, inode); 3822293a8489SMark Fasheh else 38235955102cSAl Viro inode_unlock(src); 38243db11b2eSZach Brown return ret; 38253db11b2eSZach Brown } 38263db11b2eSZach Brown 38273db11b2eSZach Brown ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, 38283db11b2eSZach Brown struct file *file_out, loff_t pos_out, 38293db11b2eSZach Brown size_t len, unsigned int flags) 38303db11b2eSZach Brown { 38313db11b2eSZach Brown ssize_t ret; 38323db11b2eSZach Brown 38333db11b2eSZach Brown ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out); 38343db11b2eSZach Brown if (ret == 0) 38353db11b2eSZach Brown ret = len; 38363db11b2eSZach Brown return ret; 38373db11b2eSZach Brown } 38383db11b2eSZach Brown 383904b38d60SChristoph Hellwig int btrfs_clone_file_range(struct file *src_file, loff_t off, 384004b38d60SChristoph Hellwig struct file *dst_file, loff_t destoff, u64 len) 38413db11b2eSZach Brown { 384204b38d60SChristoph Hellwig return btrfs_clone_files(dst_file, src_file, off, len, destoff); 3843c5c9cd4dSSage Weil } 3844c5c9cd4dSSage Weil 3845f46b5a66SChristoph Hellwig /* 3846f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3847f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3848f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3849f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3850f46b5a66SChristoph Hellwig */ 3851b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3852f46b5a66SChristoph Hellwig { 3853496ad9aaSAl Viro struct inode *inode = file_inode(file); 3854f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3855f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 38561ab86aedSSage Weil int ret; 3857f46b5a66SChristoph Hellwig 38581ab86aedSSage Weil ret = -EPERM; 3859df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3860f46b5a66SChristoph Hellwig goto out; 38611ab86aedSSage Weil 38621ab86aedSSage Weil ret = -EINPROGRESS; 38631ab86aedSSage Weil if (file->private_data) 38641ab86aedSSage Weil goto out; 38659ca9ee09SSage Weil 3866b83cc969SLi Zefan ret = -EROFS; 3867b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3868b83cc969SLi Zefan goto out; 3869b83cc969SLi Zefan 3870a561be71SAl Viro ret = mnt_want_write_file(file); 3871c146afadSYan Zheng if (ret) 3872c146afadSYan Zheng goto out; 3873c146afadSYan Zheng 3874a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 38759ca9ee09SSage Weil 3876f46b5a66SChristoph Hellwig ret = -ENOMEM; 38777a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3878abd30bb0STsutomu Itoh if (IS_ERR(trans)) 38791ab86aedSSage Weil goto out_drop; 38801ab86aedSSage Weil 38811ab86aedSSage Weil file->private_data = trans; 38821ab86aedSSage Weil return 0; 38831ab86aedSSage Weil 38841ab86aedSSage Weil out_drop: 3885a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 38862a79f17eSAl Viro mnt_drop_write_file(file); 3887f46b5a66SChristoph Hellwig out: 3888f46b5a66SChristoph Hellwig return ret; 3889f46b5a66SChristoph Hellwig } 3890f46b5a66SChristoph Hellwig 38916ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 38926ef5ed0dSJosef Bacik { 3893496ad9aaSAl Viro struct inode *inode = file_inode(file); 38946ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 38956ef5ed0dSJosef Bacik struct btrfs_root *new_root; 38966ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 38976ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 38986ef5ed0dSJosef Bacik struct btrfs_path *path; 38996ef5ed0dSJosef Bacik struct btrfs_key location; 39006ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 39016ef5ed0dSJosef Bacik u64 objectid = 0; 39026ef5ed0dSJosef Bacik u64 dir_id; 39033c04ce01SMiao Xie int ret; 39046ef5ed0dSJosef Bacik 39056ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 39066ef5ed0dSJosef Bacik return -EPERM; 39076ef5ed0dSJosef Bacik 39083c04ce01SMiao Xie ret = mnt_want_write_file(file); 39093c04ce01SMiao Xie if (ret) 39103c04ce01SMiao Xie return ret; 39113c04ce01SMiao Xie 39123c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 39133c04ce01SMiao Xie ret = -EFAULT; 39143c04ce01SMiao Xie goto out; 39153c04ce01SMiao Xie } 39166ef5ed0dSJosef Bacik 39176ef5ed0dSJosef Bacik if (!objectid) 39181cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 39196ef5ed0dSJosef Bacik 39206ef5ed0dSJosef Bacik location.objectid = objectid; 39216ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 39226ef5ed0dSJosef Bacik location.offset = (u64)-1; 39236ef5ed0dSJosef Bacik 39246ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 39253c04ce01SMiao Xie if (IS_ERR(new_root)) { 39263c04ce01SMiao Xie ret = PTR_ERR(new_root); 39273c04ce01SMiao Xie goto out; 39283c04ce01SMiao Xie } 39296ef5ed0dSJosef Bacik 39306ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 39313c04ce01SMiao Xie if (!path) { 39323c04ce01SMiao Xie ret = -ENOMEM; 39333c04ce01SMiao Xie goto out; 39343c04ce01SMiao Xie } 39356ef5ed0dSJosef Bacik path->leave_spinning = 1; 39366ef5ed0dSJosef Bacik 39376ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 393898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 39396ef5ed0dSJosef Bacik btrfs_free_path(path); 39403c04ce01SMiao Xie ret = PTR_ERR(trans); 39413c04ce01SMiao Xie goto out; 39426ef5ed0dSJosef Bacik } 39436ef5ed0dSJosef Bacik 39446c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 39456ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 39466ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3947cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 39486ef5ed0dSJosef Bacik btrfs_free_path(path); 39496ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3950efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3951efe120a0SFrank Holton "item, this isn't going to work"); 39523c04ce01SMiao Xie ret = -ENOENT; 39533c04ce01SMiao Xie goto out; 39546ef5ed0dSJosef Bacik } 39556ef5ed0dSJosef Bacik 39566ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 39576ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 39586ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 39596ef5ed0dSJosef Bacik btrfs_free_path(path); 39606ef5ed0dSJosef Bacik 39612b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 39626ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 39633c04ce01SMiao Xie out: 39643c04ce01SMiao Xie mnt_drop_write_file(file); 39653c04ce01SMiao Xie return ret; 39666ef5ed0dSJosef Bacik } 39676ef5ed0dSJosef Bacik 39685af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3969bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3970bf5fc093SJosef Bacik { 3971bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3972bf5fc093SJosef Bacik 3973bf5fc093SJosef Bacik space->total_bytes = 0; 3974bf5fc093SJosef Bacik space->used_bytes = 0; 3975bf5fc093SJosef Bacik space->flags = 0; 3976bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3977bf5fc093SJosef Bacik space->flags = block_group->flags; 3978bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3979bf5fc093SJosef Bacik space->used_bytes += 3980bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3981bf5fc093SJosef Bacik } 3982bf5fc093SJosef Bacik } 3983bf5fc093SJosef Bacik 398448a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 39851406e432SJosef Bacik { 39861406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 39871406e432SJosef Bacik struct btrfs_ioctl_space_info space; 39881406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 39897fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 399013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 39911406e432SJosef Bacik struct btrfs_space_info *info; 3992bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3993bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3994bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3995bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3996bf5fc093SJosef Bacik int num_types = 4; 39977fde62bfSChris Mason int alloc_size; 39981406e432SJosef Bacik int ret = 0; 399951788b1bSDan Rosenberg u64 slot_count = 0; 4000bf5fc093SJosef Bacik int i, c; 40011406e432SJosef Bacik 40021406e432SJosef Bacik if (copy_from_user(&space_args, 40031406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 40041406e432SJosef Bacik sizeof(space_args))) 40051406e432SJosef Bacik return -EFAULT; 40061406e432SJosef Bacik 4007bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4008bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4009bf5fc093SJosef Bacik 4010bf5fc093SJosef Bacik info = NULL; 40117fde62bfSChris Mason rcu_read_lock(); 4012bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4013bf5fc093SJosef Bacik list) { 4014bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4015bf5fc093SJosef Bacik info = tmp; 4016bf5fc093SJosef Bacik break; 4017bf5fc093SJosef Bacik } 4018bf5fc093SJosef Bacik } 40197fde62bfSChris Mason rcu_read_unlock(); 40201406e432SJosef Bacik 4021bf5fc093SJosef Bacik if (!info) 4022bf5fc093SJosef Bacik continue; 4023bf5fc093SJosef Bacik 4024bf5fc093SJosef Bacik down_read(&info->groups_sem); 4025bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4026bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 4027bf5fc093SJosef Bacik slot_count++; 4028bf5fc093SJosef Bacik } 4029bf5fc093SJosef Bacik up_read(&info->groups_sem); 4030bf5fc093SJosef Bacik } 4031bf5fc093SJosef Bacik 403236523e95SDavid Sterba /* 403336523e95SDavid Sterba * Global block reserve, exported as a space_info 403436523e95SDavid Sterba */ 403536523e95SDavid Sterba slot_count++; 403636523e95SDavid Sterba 40377fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 40387fde62bfSChris Mason if (space_args.space_slots == 0) { 40397fde62bfSChris Mason space_args.total_spaces = slot_count; 40407fde62bfSChris Mason goto out; 40417fde62bfSChris Mason } 4042bf5fc093SJosef Bacik 404351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 4044bf5fc093SJosef Bacik 40457fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 4046bf5fc093SJosef Bacik 40477fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 40487fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 40497fde62bfSChris Mason */ 40507fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 40517fde62bfSChris Mason return -ENOMEM; 40527fde62bfSChris Mason 40537fde62bfSChris Mason space_args.total_spaces = 0; 40548d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 40557fde62bfSChris Mason if (!dest) 40567fde62bfSChris Mason return -ENOMEM; 40577fde62bfSChris Mason dest_orig = dest; 40587fde62bfSChris Mason 40597fde62bfSChris Mason /* now we have a buffer to copy into */ 4060bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4061bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4062bf5fc093SJosef Bacik 406351788b1bSDan Rosenberg if (!slot_count) 406451788b1bSDan Rosenberg break; 406551788b1bSDan Rosenberg 4066bf5fc093SJosef Bacik info = NULL; 40671406e432SJosef Bacik rcu_read_lock(); 4068bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4069bf5fc093SJosef Bacik list) { 4070bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4071bf5fc093SJosef Bacik info = tmp; 40727fde62bfSChris Mason break; 4073bf5fc093SJosef Bacik } 4074bf5fc093SJosef Bacik } 4075bf5fc093SJosef Bacik rcu_read_unlock(); 40767fde62bfSChris Mason 4077bf5fc093SJosef Bacik if (!info) 4078bf5fc093SJosef Bacik continue; 4079bf5fc093SJosef Bacik down_read(&info->groups_sem); 4080bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4081bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 40825af3e8ccSStefan Behrens btrfs_get_block_group_info( 40835af3e8ccSStefan Behrens &info->block_groups[c], &space); 40847fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 40851406e432SJosef Bacik dest++; 40861406e432SJosef Bacik space_args.total_spaces++; 408751788b1bSDan Rosenberg slot_count--; 40881406e432SJosef Bacik } 408951788b1bSDan Rosenberg if (!slot_count) 409051788b1bSDan Rosenberg break; 4091bf5fc093SJosef Bacik } 4092bf5fc093SJosef Bacik up_read(&info->groups_sem); 4093bf5fc093SJosef Bacik } 40941406e432SJosef Bacik 409536523e95SDavid Sterba /* 409636523e95SDavid Sterba * Add global block reserve 409736523e95SDavid Sterba */ 409836523e95SDavid Sterba if (slot_count) { 409936523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 410036523e95SDavid Sterba 410136523e95SDavid Sterba spin_lock(&block_rsv->lock); 410236523e95SDavid Sterba space.total_bytes = block_rsv->size; 410336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 410436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 410536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 410636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 410736523e95SDavid Sterba space_args.total_spaces++; 410836523e95SDavid Sterba } 410936523e95SDavid Sterba 41102eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 41117fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 41127fde62bfSChris Mason 41137fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 41147fde62bfSChris Mason ret = -EFAULT; 41157fde62bfSChris Mason 41167fde62bfSChris Mason kfree(dest_orig); 41177fde62bfSChris Mason out: 41187fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 41191406e432SJosef Bacik ret = -EFAULT; 41201406e432SJosef Bacik 41211406e432SJosef Bacik return ret; 41221406e432SJosef Bacik } 41231406e432SJosef Bacik 4124f46b5a66SChristoph Hellwig /* 4125f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4126f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4127f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4128f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4129f46b5a66SChristoph Hellwig */ 4130f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4131f46b5a66SChristoph Hellwig { 4132496ad9aaSAl Viro struct inode *inode = file_inode(file); 4133f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4134f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4135f46b5a66SChristoph Hellwig 4136f46b5a66SChristoph Hellwig trans = file->private_data; 41371ab86aedSSage Weil if (!trans) 41381ab86aedSSage Weil return -EINVAL; 4139b214107eSChristoph Hellwig file->private_data = NULL; 41409ca9ee09SSage Weil 41411ab86aedSSage Weil btrfs_end_transaction(trans, root); 41421ab86aedSSage Weil 4143a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 41449ca9ee09SSage Weil 41452a79f17eSAl Viro mnt_drop_write_file(file); 41461ab86aedSSage Weil return 0; 4147f46b5a66SChristoph Hellwig } 4148f46b5a66SChristoph Hellwig 41499a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 41509a8c28beSMiao Xie void __user *argp) 415146204592SSage Weil { 415246204592SSage Weil struct btrfs_trans_handle *trans; 415346204592SSage Weil u64 transid; 4154db5b493aSTsutomu Itoh int ret; 415546204592SSage Weil 4156d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4157ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4158ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 415998d5dc13STsutomu Itoh return PTR_ERR(trans); 4160ff7c1d33SMiao Xie 4161ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4162ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4163ff7c1d33SMiao Xie goto out; 4164ff7c1d33SMiao Xie } 416546204592SSage Weil transid = trans->transid; 4166db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 41678b2b2d3cSTsutomu Itoh if (ret) { 41688b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4169db5b493aSTsutomu Itoh return ret; 41708b2b2d3cSTsutomu Itoh } 4171ff7c1d33SMiao Xie out: 417246204592SSage Weil if (argp) 417346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 417446204592SSage Weil return -EFAULT; 417546204592SSage Weil return 0; 417646204592SSage Weil } 417746204592SSage Weil 41789a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 41799a8c28beSMiao Xie void __user *argp) 418046204592SSage Weil { 418146204592SSage Weil u64 transid; 418246204592SSage Weil 418346204592SSage Weil if (argp) { 418446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 418546204592SSage Weil return -EFAULT; 418646204592SSage Weil } else { 418746204592SSage Weil transid = 0; /* current trans */ 418846204592SSage Weil } 418946204592SSage Weil return btrfs_wait_for_commit(root, transid); 419046204592SSage Weil } 419146204592SSage Weil 4192b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4193475f6387SJan Schmidt { 4194496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4195475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4196b8e95489SMiao Xie int ret; 4197475f6387SJan Schmidt 4198475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4199475f6387SJan Schmidt return -EPERM; 4200475f6387SJan Schmidt 4201475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4202475f6387SJan Schmidt if (IS_ERR(sa)) 4203475f6387SJan Schmidt return PTR_ERR(sa); 4204475f6387SJan Schmidt 4205b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4206b8e95489SMiao Xie ret = mnt_want_write_file(file); 4207b8e95489SMiao Xie if (ret) 4208b8e95489SMiao Xie goto out; 4209b8e95489SMiao Xie } 4210b8e95489SMiao Xie 4211aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 421263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 421363a212abSStefan Behrens 0); 4214475f6387SJan Schmidt 4215475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4216475f6387SJan Schmidt ret = -EFAULT; 4217475f6387SJan Schmidt 4218b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4219b8e95489SMiao Xie mnt_drop_write_file(file); 4220b8e95489SMiao Xie out: 4221475f6387SJan Schmidt kfree(sa); 4222475f6387SJan Schmidt return ret; 4223475f6387SJan Schmidt } 4224475f6387SJan Schmidt 4225475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4226475f6387SJan Schmidt { 4227475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4228475f6387SJan Schmidt return -EPERM; 4229475f6387SJan Schmidt 4230aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4231475f6387SJan Schmidt } 4232475f6387SJan Schmidt 4233475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4234475f6387SJan Schmidt void __user *arg) 4235475f6387SJan Schmidt { 4236475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4237475f6387SJan Schmidt int ret; 4238475f6387SJan Schmidt 4239475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4240475f6387SJan Schmidt return -EPERM; 4241475f6387SJan Schmidt 4242475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4243475f6387SJan Schmidt if (IS_ERR(sa)) 4244475f6387SJan Schmidt return PTR_ERR(sa); 4245475f6387SJan Schmidt 4246475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4247475f6387SJan Schmidt 4248475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4249475f6387SJan Schmidt ret = -EFAULT; 4250475f6387SJan Schmidt 4251475f6387SJan Schmidt kfree(sa); 4252475f6387SJan Schmidt return ret; 4253475f6387SJan Schmidt } 4254475f6387SJan Schmidt 4255c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4256b27f7c0cSDavid Sterba void __user *arg) 4257c11d2c23SStefan Behrens { 4258c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4259c11d2c23SStefan Behrens int ret; 4260c11d2c23SStefan Behrens 4261c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4262c11d2c23SStefan Behrens if (IS_ERR(sa)) 4263c11d2c23SStefan Behrens return PTR_ERR(sa); 4264c11d2c23SStefan Behrens 4265b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4266b27f7c0cSDavid Sterba kfree(sa); 4267b27f7c0cSDavid Sterba return -EPERM; 4268b27f7c0cSDavid Sterba } 4269b27f7c0cSDavid Sterba 4270b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4271c11d2c23SStefan Behrens 4272c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4273c11d2c23SStefan Behrens ret = -EFAULT; 4274c11d2c23SStefan Behrens 4275c11d2c23SStefan Behrens kfree(sa); 4276c11d2c23SStefan Behrens return ret; 4277c11d2c23SStefan Behrens } 4278c11d2c23SStefan Behrens 42793f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 42803f6bcfbdSStefan Behrens { 42813f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 42823f6bcfbdSStefan Behrens int ret; 42833f6bcfbdSStefan Behrens 42843f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 42853f6bcfbdSStefan Behrens return -EPERM; 42863f6bcfbdSStefan Behrens 42873f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 42883f6bcfbdSStefan Behrens if (IS_ERR(p)) 42893f6bcfbdSStefan Behrens return PTR_ERR(p); 42903f6bcfbdSStefan Behrens 42913f6bcfbdSStefan Behrens switch (p->cmd) { 42923f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4293adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4294adfa97cbSIlya Dryomov ret = -EROFS; 4295adfa97cbSIlya Dryomov goto out; 4296adfa97cbSIlya Dryomov } 42973f6bcfbdSStefan Behrens if (atomic_xchg( 42983f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 42993f6bcfbdSStefan Behrens 1)) { 4300e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 43013f6bcfbdSStefan Behrens } else { 43023f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 43033f6bcfbdSStefan Behrens atomic_set( 43043f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 43053f6bcfbdSStefan Behrens 0); 43063f6bcfbdSStefan Behrens } 43073f6bcfbdSStefan Behrens break; 43083f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 43093f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 43103f6bcfbdSStefan Behrens ret = 0; 43113f6bcfbdSStefan Behrens break; 43123f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 43133f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 43143f6bcfbdSStefan Behrens break; 43153f6bcfbdSStefan Behrens default: 43163f6bcfbdSStefan Behrens ret = -EINVAL; 43173f6bcfbdSStefan Behrens break; 43183f6bcfbdSStefan Behrens } 43193f6bcfbdSStefan Behrens 43203f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 43213f6bcfbdSStefan Behrens ret = -EFAULT; 4322adfa97cbSIlya Dryomov out: 43233f6bcfbdSStefan Behrens kfree(p); 43243f6bcfbdSStefan Behrens return ret; 43253f6bcfbdSStefan Behrens } 43263f6bcfbdSStefan Behrens 4327d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4328d7728c96SJan Schmidt { 4329d7728c96SJan Schmidt int ret = 0; 4330d7728c96SJan Schmidt int i; 4331740c3d22SChris Mason u64 rel_ptr; 4332d7728c96SJan Schmidt int size; 4333806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4334d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4335d7728c96SJan Schmidt struct btrfs_path *path; 4336d7728c96SJan Schmidt 433782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4338d7728c96SJan Schmidt return -EPERM; 4339d7728c96SJan Schmidt 4340d7728c96SJan Schmidt path = btrfs_alloc_path(); 4341d7728c96SJan Schmidt if (!path) { 4342d7728c96SJan Schmidt ret = -ENOMEM; 4343d7728c96SJan Schmidt goto out; 4344d7728c96SJan Schmidt } 4345d7728c96SJan Schmidt 4346d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4347d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4348d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4349d7728c96SJan Schmidt ipa = NULL; 4350d7728c96SJan Schmidt goto out; 4351d7728c96SJan Schmidt } 4352d7728c96SJan Schmidt 4353d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4354d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4355d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4356d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4357d7728c96SJan Schmidt ipath = NULL; 4358d7728c96SJan Schmidt goto out; 4359d7728c96SJan Schmidt } 4360d7728c96SJan Schmidt 4361d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4362d7728c96SJan Schmidt if (ret < 0) 4363d7728c96SJan Schmidt goto out; 4364d7728c96SJan Schmidt 4365d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4366745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4367745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4368740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4369d7728c96SJan Schmidt } 4370d7728c96SJan Schmidt 4371745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4372745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4373d7728c96SJan Schmidt if (ret) { 4374d7728c96SJan Schmidt ret = -EFAULT; 4375d7728c96SJan Schmidt goto out; 4376d7728c96SJan Schmidt } 4377d7728c96SJan Schmidt 4378d7728c96SJan Schmidt out: 4379d7728c96SJan Schmidt btrfs_free_path(path); 4380d7728c96SJan Schmidt free_ipath(ipath); 4381d7728c96SJan Schmidt kfree(ipa); 4382d7728c96SJan Schmidt 4383d7728c96SJan Schmidt return ret; 4384d7728c96SJan Schmidt } 4385d7728c96SJan Schmidt 4386d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4387d7728c96SJan Schmidt { 4388d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4389d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4390d7728c96SJan Schmidt 4391d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4392d7728c96SJan Schmidt inodes->bytes_left -= c; 4393d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4394d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4395d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4396d7728c96SJan Schmidt inodes->elem_cnt += 3; 4397d7728c96SJan Schmidt } else { 4398d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4399d7728c96SJan Schmidt inodes->bytes_left = 0; 4400d7728c96SJan Schmidt inodes->elem_missed += 3; 4401d7728c96SJan Schmidt } 4402d7728c96SJan Schmidt 4403d7728c96SJan Schmidt return 0; 4404d7728c96SJan Schmidt } 4405d7728c96SJan Schmidt 4406d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4407d7728c96SJan Schmidt void __user *arg) 4408d7728c96SJan Schmidt { 4409d7728c96SJan Schmidt int ret = 0; 4410d7728c96SJan Schmidt int size; 4411d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4412d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4413d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4414d7728c96SJan Schmidt 4415d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4416d7728c96SJan Schmidt return -EPERM; 4417d7728c96SJan Schmidt 4418d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4419d7728c96SJan Schmidt if (IS_ERR(loi)) { 4420d7728c96SJan Schmidt ret = PTR_ERR(loi); 4421d7728c96SJan Schmidt loi = NULL; 4422d7728c96SJan Schmidt goto out; 4423d7728c96SJan Schmidt } 4424d7728c96SJan Schmidt 4425d7728c96SJan Schmidt path = btrfs_alloc_path(); 4426d7728c96SJan Schmidt if (!path) { 4427d7728c96SJan Schmidt ret = -ENOMEM; 4428d7728c96SJan Schmidt goto out; 4429d7728c96SJan Schmidt } 4430d7728c96SJan Schmidt 4431ee22184bSByongho Lee size = min_t(u32, loi->size, SZ_64K); 4432d7728c96SJan Schmidt inodes = init_data_container(size); 4433d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4434d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4435d7728c96SJan Schmidt inodes = NULL; 4436d7728c96SJan Schmidt goto out; 4437d7728c96SJan Schmidt } 4438d7728c96SJan Schmidt 4439df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4440df031f07SLiu Bo build_ino_list, inodes); 4441df031f07SLiu Bo if (ret == -EINVAL) 4442d7728c96SJan Schmidt ret = -ENOENT; 4443d7728c96SJan Schmidt if (ret < 0) 4444d7728c96SJan Schmidt goto out; 4445d7728c96SJan Schmidt 4446745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4447745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4448d7728c96SJan Schmidt if (ret) 4449d7728c96SJan Schmidt ret = -EFAULT; 4450d7728c96SJan Schmidt 4451d7728c96SJan Schmidt out: 4452d7728c96SJan Schmidt btrfs_free_path(path); 4453425d17a2SLiu Bo vfree(inodes); 4454d7728c96SJan Schmidt kfree(loi); 4455d7728c96SJan Schmidt 4456d7728c96SJan Schmidt return ret; 4457d7728c96SJan Schmidt } 4458d7728c96SJan Schmidt 445919a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4460c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4461c9e9f97bSIlya Dryomov { 4462c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4463c9e9f97bSIlya Dryomov 4464c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4465c9e9f97bSIlya Dryomov 4466837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4467837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4468837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4469837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4470a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4471a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4472837d5b6eSIlya Dryomov 4473c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4474c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4475c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 447619a39dceSIlya Dryomov 447719a39dceSIlya Dryomov if (lock) { 447819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 447919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 448019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 448119a39dceSIlya Dryomov } else { 448219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 448319a39dceSIlya Dryomov } 4484c9e9f97bSIlya Dryomov } 4485c9e9f97bSIlya Dryomov 44869ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4487c9e9f97bSIlya Dryomov { 4488496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4489c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4490c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4491c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4492ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4493c9e9f97bSIlya Dryomov int ret; 4494c9e9f97bSIlya Dryomov 4495c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4496c9e9f97bSIlya Dryomov return -EPERM; 4497c9e9f97bSIlya Dryomov 4498e54bfa31SLiu Bo ret = mnt_want_write_file(file); 44999ba1f6e4SLiu Bo if (ret) 45009ba1f6e4SLiu Bo return ret; 45019ba1f6e4SLiu Bo 4502ed0fb78fSIlya Dryomov again: 4503ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4504c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4505c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4506ed0fb78fSIlya Dryomov need_unlock = true; 4507ed0fb78fSIlya Dryomov goto locked; 4508ed0fb78fSIlya Dryomov } 4509ed0fb78fSIlya Dryomov 4510ed0fb78fSIlya Dryomov /* 4511ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4512ed0fb78fSIlya Dryomov * (1) some other op is running 4513ed0fb78fSIlya Dryomov * (2) balance is running 4514ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4515ed0fb78fSIlya Dryomov */ 4516ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4517ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4518ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4519ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4520ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4521ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4522ed0fb78fSIlya Dryomov goto again; 4523ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4524ed0fb78fSIlya Dryomov 4525ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4526ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4527ed0fb78fSIlya Dryomov /* this is (3) */ 4528ed0fb78fSIlya Dryomov need_unlock = false; 4529ed0fb78fSIlya Dryomov goto locked; 4530ed0fb78fSIlya Dryomov } 4531ed0fb78fSIlya Dryomov 4532ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4533ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4534ed0fb78fSIlya Dryomov goto again; 4535ed0fb78fSIlya Dryomov } else { 4536ed0fb78fSIlya Dryomov /* this is (2) */ 4537ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4538ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4539ed0fb78fSIlya Dryomov goto out; 4540ed0fb78fSIlya Dryomov } 4541ed0fb78fSIlya Dryomov } else { 4542ed0fb78fSIlya Dryomov /* this is (1) */ 4543ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4544e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4545ed0fb78fSIlya Dryomov goto out; 4546ed0fb78fSIlya Dryomov } 4547ed0fb78fSIlya Dryomov 4548ed0fb78fSIlya Dryomov locked: 4549ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4550c9e9f97bSIlya Dryomov 4551c9e9f97bSIlya Dryomov if (arg) { 4552c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4553c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4554c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4555ed0fb78fSIlya Dryomov goto out_unlock; 4556c9e9f97bSIlya Dryomov } 4557de322263SIlya Dryomov 4558de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4559de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4560de322263SIlya Dryomov ret = -ENOTCONN; 4561de322263SIlya Dryomov goto out_bargs; 4562de322263SIlya Dryomov } 4563de322263SIlya Dryomov 4564de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4565de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4566de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4567de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4568de322263SIlya Dryomov 4569de322263SIlya Dryomov goto do_balance; 4570de322263SIlya Dryomov } 4571c9e9f97bSIlya Dryomov } else { 4572c9e9f97bSIlya Dryomov bargs = NULL; 4573c9e9f97bSIlya Dryomov } 4574c9e9f97bSIlya Dryomov 4575ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4576837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4577837d5b6eSIlya Dryomov goto out_bargs; 4578837d5b6eSIlya Dryomov } 4579837d5b6eSIlya Dryomov 45808d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4581c9e9f97bSIlya Dryomov if (!bctl) { 4582c9e9f97bSIlya Dryomov ret = -ENOMEM; 4583c9e9f97bSIlya Dryomov goto out_bargs; 4584c9e9f97bSIlya Dryomov } 4585c9e9f97bSIlya Dryomov 4586c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4587c9e9f97bSIlya Dryomov if (arg) { 4588c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4589c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4590c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4591c9e9f97bSIlya Dryomov 4592c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4593f43ffb60SIlya Dryomov } else { 4594f43ffb60SIlya Dryomov /* balance everything - no filters */ 4595f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4596c9e9f97bSIlya Dryomov } 4597c9e9f97bSIlya Dryomov 45988eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 45998eb93459SDavid Sterba ret = -EINVAL; 46000f89abf5SChristian Engelmayer goto out_bctl; 46018eb93459SDavid Sterba } 46028eb93459SDavid Sterba 4603de322263SIlya Dryomov do_balance: 4604c9e9f97bSIlya Dryomov /* 4605ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4606ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4607ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4608ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4609ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4610c9e9f97bSIlya Dryomov */ 4611ed0fb78fSIlya Dryomov need_unlock = false; 4612ed0fb78fSIlya Dryomov 4613ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 46140f89abf5SChristian Engelmayer bctl = NULL; 4615ed0fb78fSIlya Dryomov 4616c9e9f97bSIlya Dryomov if (arg) { 4617c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4618c9e9f97bSIlya Dryomov ret = -EFAULT; 4619c9e9f97bSIlya Dryomov } 4620c9e9f97bSIlya Dryomov 46210f89abf5SChristian Engelmayer out_bctl: 46220f89abf5SChristian Engelmayer kfree(bctl); 4623c9e9f97bSIlya Dryomov out_bargs: 4624c9e9f97bSIlya Dryomov kfree(bargs); 4625ed0fb78fSIlya Dryomov out_unlock: 4626c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4627c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4628ed0fb78fSIlya Dryomov if (need_unlock) 4629ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4630ed0fb78fSIlya Dryomov out: 4631e54bfa31SLiu Bo mnt_drop_write_file(file); 4632c9e9f97bSIlya Dryomov return ret; 4633c9e9f97bSIlya Dryomov } 4634c9e9f97bSIlya Dryomov 4635837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4636837d5b6eSIlya Dryomov { 4637837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4638837d5b6eSIlya Dryomov return -EPERM; 4639837d5b6eSIlya Dryomov 4640837d5b6eSIlya Dryomov switch (cmd) { 4641837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4642837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4643a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4644a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4645837d5b6eSIlya Dryomov } 4646837d5b6eSIlya Dryomov 4647837d5b6eSIlya Dryomov return -EINVAL; 4648837d5b6eSIlya Dryomov } 4649837d5b6eSIlya Dryomov 465019a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 465119a39dceSIlya Dryomov void __user *arg) 465219a39dceSIlya Dryomov { 465319a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 465419a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 465519a39dceSIlya Dryomov int ret = 0; 465619a39dceSIlya Dryomov 465719a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 465819a39dceSIlya Dryomov return -EPERM; 465919a39dceSIlya Dryomov 466019a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 466119a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 466219a39dceSIlya Dryomov ret = -ENOTCONN; 466319a39dceSIlya Dryomov goto out; 466419a39dceSIlya Dryomov } 466519a39dceSIlya Dryomov 46668d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 466719a39dceSIlya Dryomov if (!bargs) { 466819a39dceSIlya Dryomov ret = -ENOMEM; 466919a39dceSIlya Dryomov goto out; 467019a39dceSIlya Dryomov } 467119a39dceSIlya Dryomov 467219a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 467319a39dceSIlya Dryomov 467419a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 467519a39dceSIlya Dryomov ret = -EFAULT; 467619a39dceSIlya Dryomov 467719a39dceSIlya Dryomov kfree(bargs); 467819a39dceSIlya Dryomov out: 467919a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 468019a39dceSIlya Dryomov return ret; 468119a39dceSIlya Dryomov } 468219a39dceSIlya Dryomov 4683905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 46845d13a37bSArne Jansen { 4685496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46865d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 46875d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 46885d13a37bSArne Jansen int ret; 46895d13a37bSArne Jansen int err; 46905d13a37bSArne Jansen 46915d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46925d13a37bSArne Jansen return -EPERM; 46935d13a37bSArne Jansen 4694905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4695905b0ddaSMiao Xie if (ret) 4696905b0ddaSMiao Xie return ret; 46975d13a37bSArne Jansen 46985d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4699905b0ddaSMiao Xie if (IS_ERR(sa)) { 4700905b0ddaSMiao Xie ret = PTR_ERR(sa); 4701905b0ddaSMiao Xie goto drop_write; 4702905b0ddaSMiao Xie } 47035d13a37bSArne Jansen 47047708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 470592f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 47065d13a37bSArne Jansen if (IS_ERR(trans)) { 47075d13a37bSArne Jansen ret = PTR_ERR(trans); 47085d13a37bSArne Jansen goto out; 47095d13a37bSArne Jansen } 47105d13a37bSArne Jansen 47115d13a37bSArne Jansen switch (sa->cmd) { 47125d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 47135d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 47145d13a37bSArne Jansen break; 47155d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 47165d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 47175d13a37bSArne Jansen break; 47185d13a37bSArne Jansen default: 47195d13a37bSArne Jansen ret = -EINVAL; 47205d13a37bSArne Jansen break; 47215d13a37bSArne Jansen } 47225d13a37bSArne Jansen 472392f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 47245d13a37bSArne Jansen if (err && !ret) 47255d13a37bSArne Jansen ret = err; 47265d13a37bSArne Jansen out: 47275d13a37bSArne Jansen kfree(sa); 47287708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4729905b0ddaSMiao Xie drop_write: 4730905b0ddaSMiao Xie mnt_drop_write_file(file); 47315d13a37bSArne Jansen return ret; 47325d13a37bSArne Jansen } 47335d13a37bSArne Jansen 4734905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 47355d13a37bSArne Jansen { 4736496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47375d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 47385d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47395d13a37bSArne Jansen int ret; 47405d13a37bSArne Jansen int err; 47415d13a37bSArne Jansen 47425d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47435d13a37bSArne Jansen return -EPERM; 47445d13a37bSArne Jansen 4745905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4746905b0ddaSMiao Xie if (ret) 4747905b0ddaSMiao Xie return ret; 47485d13a37bSArne Jansen 47495d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4750905b0ddaSMiao Xie if (IS_ERR(sa)) { 4751905b0ddaSMiao Xie ret = PTR_ERR(sa); 4752905b0ddaSMiao Xie goto drop_write; 4753905b0ddaSMiao Xie } 47545d13a37bSArne Jansen 47555d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47565d13a37bSArne Jansen if (IS_ERR(trans)) { 47575d13a37bSArne Jansen ret = PTR_ERR(trans); 47585d13a37bSArne Jansen goto out; 47595d13a37bSArne Jansen } 47605d13a37bSArne Jansen 47615d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 47625d13a37bSArne Jansen if (sa->assign) { 47635d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 47645d13a37bSArne Jansen sa->src, sa->dst); 47655d13a37bSArne Jansen } else { 47665d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 47675d13a37bSArne Jansen sa->src, sa->dst); 47685d13a37bSArne Jansen } 47695d13a37bSArne Jansen 4770e082f563SQu Wenruo /* update qgroup status and info */ 4771e082f563SQu Wenruo err = btrfs_run_qgroups(trans, root->fs_info); 4772e082f563SQu Wenruo if (err < 0) 4773a4553fefSAnand Jain btrfs_std_error(root->fs_info, ret, 4774e082f563SQu Wenruo "failed to update qgroup status and info\n"); 47755d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47765d13a37bSArne Jansen if (err && !ret) 47775d13a37bSArne Jansen ret = err; 47785d13a37bSArne Jansen 47795d13a37bSArne Jansen out: 47805d13a37bSArne Jansen kfree(sa); 4781905b0ddaSMiao Xie drop_write: 4782905b0ddaSMiao Xie mnt_drop_write_file(file); 47835d13a37bSArne Jansen return ret; 47845d13a37bSArne Jansen } 47855d13a37bSArne Jansen 4786905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(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_qgroup_create_args *sa; 47905d13a37bSArne Jansen struct btrfs_trans_handle *trans; 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 4807d86e56cfSMiao Xie if (!sa->qgroupid) { 4808d86e56cfSMiao Xie ret = -EINVAL; 4809d86e56cfSMiao Xie goto out; 4810d86e56cfSMiao Xie } 4811d86e56cfSMiao Xie 48125d13a37bSArne Jansen trans = btrfs_join_transaction(root); 48135d13a37bSArne Jansen if (IS_ERR(trans)) { 48145d13a37bSArne Jansen ret = PTR_ERR(trans); 48155d13a37bSArne Jansen goto out; 48165d13a37bSArne Jansen } 48175d13a37bSArne Jansen 48185d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 48195d13a37bSArne Jansen if (sa->create) { 48204087cf24SDongsheng Yang ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); 48215d13a37bSArne Jansen } else { 48225d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 48235d13a37bSArne Jansen } 48245d13a37bSArne Jansen 48255d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 48265d13a37bSArne Jansen if (err && !ret) 48275d13a37bSArne Jansen ret = err; 48285d13a37bSArne Jansen 48295d13a37bSArne Jansen out: 48305d13a37bSArne Jansen kfree(sa); 4831905b0ddaSMiao Xie drop_write: 4832905b0ddaSMiao Xie mnt_drop_write_file(file); 48335d13a37bSArne Jansen return ret; 48345d13a37bSArne Jansen } 48355d13a37bSArne Jansen 4836905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 48375d13a37bSArne Jansen { 4838496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 48405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 48415d13a37bSArne Jansen int ret; 48425d13a37bSArne Jansen int err; 48435d13a37bSArne Jansen u64 qgroupid; 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 qgroupid = sa->qgroupid; 48655d13a37bSArne Jansen if (!qgroupid) { 48665d13a37bSArne Jansen /* take the current subvol as qgroup */ 48675d13a37bSArne Jansen qgroupid = root->root_key.objectid; 48685d13a37bSArne Jansen } 48695d13a37bSArne Jansen 48705d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 48715d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 48725d13a37bSArne Jansen 48735d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 48745d13a37bSArne Jansen if (err && !ret) 48755d13a37bSArne Jansen ret = err; 48765d13a37bSArne Jansen 48775d13a37bSArne Jansen out: 48785d13a37bSArne Jansen kfree(sa); 4879905b0ddaSMiao Xie drop_write: 4880905b0ddaSMiao Xie mnt_drop_write_file(file); 48815d13a37bSArne Jansen return ret; 48825d13a37bSArne Jansen } 48835d13a37bSArne Jansen 48842f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 48852f232036SJan Schmidt { 48866d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48872f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 48882f232036SJan Schmidt int ret; 48892f232036SJan Schmidt 48902f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 48912f232036SJan Schmidt return -EPERM; 48922f232036SJan Schmidt 48932f232036SJan Schmidt ret = mnt_want_write_file(file); 48942f232036SJan Schmidt if (ret) 48952f232036SJan Schmidt return ret; 48962f232036SJan Schmidt 48972f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 48982f232036SJan Schmidt if (IS_ERR(qsa)) { 48992f232036SJan Schmidt ret = PTR_ERR(qsa); 49002f232036SJan Schmidt goto drop_write; 49012f232036SJan Schmidt } 49022f232036SJan Schmidt 49032f232036SJan Schmidt if (qsa->flags) { 49042f232036SJan Schmidt ret = -EINVAL; 49052f232036SJan Schmidt goto out; 49062f232036SJan Schmidt } 49072f232036SJan Schmidt 49082f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 49092f232036SJan Schmidt 49102f232036SJan Schmidt out: 49112f232036SJan Schmidt kfree(qsa); 49122f232036SJan Schmidt drop_write: 49132f232036SJan Schmidt mnt_drop_write_file(file); 49142f232036SJan Schmidt return ret; 49152f232036SJan Schmidt } 49162f232036SJan Schmidt 49172f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 49182f232036SJan Schmidt { 49196d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49202f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 49212f232036SJan Schmidt int ret = 0; 49222f232036SJan Schmidt 49232f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 49242f232036SJan Schmidt return -EPERM; 49252f232036SJan Schmidt 49268d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 49272f232036SJan Schmidt if (!qsa) 49282f232036SJan Schmidt return -ENOMEM; 49292f232036SJan Schmidt 49302f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 49312f232036SJan Schmidt qsa->flags = 1; 49322f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 49332f232036SJan Schmidt } 49342f232036SJan Schmidt 49352f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 49362f232036SJan Schmidt ret = -EFAULT; 49372f232036SJan Schmidt 49382f232036SJan Schmidt kfree(qsa); 49392f232036SJan Schmidt return ret; 49402f232036SJan Schmidt } 49412f232036SJan Schmidt 494257254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 494357254b6eSJan Schmidt { 494454563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 494557254b6eSJan Schmidt 494657254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 494757254b6eSJan Schmidt return -EPERM; 494857254b6eSJan Schmidt 494957254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 495057254b6eSJan Schmidt } 495157254b6eSJan Schmidt 4952abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4953abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 49548ea05e3aSAlexander Block { 4955496ad9aaSAl Viro struct inode *inode = file_inode(file); 49568ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 49578ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 49588ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 49598ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 49608ea05e3aSAlexander Block int ret = 0; 4961dd5f9615SStefan Behrens int received_uuid_changed; 49628ea05e3aSAlexander Block 4963bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4964bd60ea0fSDavid Sterba return -EPERM; 4965bd60ea0fSDavid Sterba 49668ea05e3aSAlexander Block ret = mnt_want_write_file(file); 49678ea05e3aSAlexander Block if (ret < 0) 49688ea05e3aSAlexander Block return ret; 49698ea05e3aSAlexander Block 49708ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 49718ea05e3aSAlexander Block 49728ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 49738ea05e3aSAlexander Block ret = -EINVAL; 49748ea05e3aSAlexander Block goto out; 49758ea05e3aSAlexander Block } 49768ea05e3aSAlexander Block 49778ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 49788ea05e3aSAlexander Block ret = -EROFS; 49798ea05e3aSAlexander Block goto out; 49808ea05e3aSAlexander Block } 49818ea05e3aSAlexander Block 4982dd5f9615SStefan Behrens /* 4983dd5f9615SStefan Behrens * 1 - root item 4984dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4985dd5f9615SStefan Behrens */ 4986dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 49878ea05e3aSAlexander Block if (IS_ERR(trans)) { 49888ea05e3aSAlexander Block ret = PTR_ERR(trans); 49898ea05e3aSAlexander Block trans = NULL; 49908ea05e3aSAlexander Block goto out; 49918ea05e3aSAlexander Block } 49928ea05e3aSAlexander Block 49938ea05e3aSAlexander Block sa->rtransid = trans->transid; 49948ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 49958ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 49968ea05e3aSAlexander Block 4997dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4998dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4999dd5f9615SStefan Behrens if (received_uuid_changed && 5000dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 5001dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 5002dd5f9615SStefan Behrens root_item->received_uuid, 5003dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5004dd5f9615SStefan Behrens root->root_key.objectid); 50058ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 50068ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 50078ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 50083cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 50093cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 50103cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 50113cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 50128ea05e3aSAlexander Block 50138ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 50148ea05e3aSAlexander Block &root->root_key, &root->root_item); 50158ea05e3aSAlexander Block if (ret < 0) { 50168ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 50178ea05e3aSAlexander Block goto out; 5018dd5f9615SStefan Behrens } 5019dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 5020dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 5021dd5f9615SStefan Behrens sa->uuid, 5022dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5023dd5f9615SStefan Behrens root->root_key.objectid); 5024dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 5025dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 5026dd5f9615SStefan Behrens goto out; 5027dd5f9615SStefan Behrens } 5028dd5f9615SStefan Behrens } 50298ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 5030dd5f9615SStefan Behrens if (ret < 0) { 5031dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 50328ea05e3aSAlexander Block goto out; 50338ea05e3aSAlexander Block } 50348ea05e3aSAlexander Block 5035abccd00fSHugo Mills out: 5036abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 5037abccd00fSHugo Mills mnt_drop_write_file(file); 5038abccd00fSHugo Mills return ret; 5039abccd00fSHugo Mills } 5040abccd00fSHugo Mills 5041abccd00fSHugo Mills #ifdef CONFIG_64BIT 5042abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 5043abccd00fSHugo Mills void __user *arg) 5044abccd00fSHugo Mills { 5045abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 5046abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 5047abccd00fSHugo Mills int ret = 0; 5048abccd00fSHugo Mills 5049abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 5050abccd00fSHugo Mills if (IS_ERR(args32)) { 5051abccd00fSHugo Mills ret = PTR_ERR(args32); 5052abccd00fSHugo Mills args32 = NULL; 5053abccd00fSHugo Mills goto out; 5054abccd00fSHugo Mills } 5055abccd00fSHugo Mills 50568d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 505784dbeb87SDan Carpenter if (!args64) { 505884dbeb87SDan Carpenter ret = -ENOMEM; 5059abccd00fSHugo Mills goto out; 5060abccd00fSHugo Mills } 5061abccd00fSHugo Mills 5062abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 5063abccd00fSHugo Mills args64->stransid = args32->stransid; 5064abccd00fSHugo Mills args64->rtransid = args32->rtransid; 5065abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 5066abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 5067abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 5068abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 5069abccd00fSHugo Mills args64->flags = args32->flags; 5070abccd00fSHugo Mills 5071abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 5072abccd00fSHugo Mills if (ret) 5073abccd00fSHugo Mills goto out; 5074abccd00fSHugo Mills 5075abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 5076abccd00fSHugo Mills args32->stransid = args64->stransid; 5077abccd00fSHugo Mills args32->rtransid = args64->rtransid; 5078abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 5079abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 5080abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 5081abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 5082abccd00fSHugo Mills args32->flags = args64->flags; 5083abccd00fSHugo Mills 5084abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 5085abccd00fSHugo Mills if (ret) 5086abccd00fSHugo Mills ret = -EFAULT; 5087abccd00fSHugo Mills 5088abccd00fSHugo Mills out: 5089abccd00fSHugo Mills kfree(args32); 5090abccd00fSHugo Mills kfree(args64); 5091abccd00fSHugo Mills return ret; 5092abccd00fSHugo Mills } 5093abccd00fSHugo Mills #endif 5094abccd00fSHugo Mills 5095abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 5096abccd00fSHugo Mills void __user *arg) 5097abccd00fSHugo Mills { 5098abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 5099abccd00fSHugo Mills int ret = 0; 5100abccd00fSHugo Mills 5101abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 5102abccd00fSHugo Mills if (IS_ERR(sa)) { 5103abccd00fSHugo Mills ret = PTR_ERR(sa); 5104abccd00fSHugo Mills sa = NULL; 5105abccd00fSHugo Mills goto out; 5106abccd00fSHugo Mills } 5107abccd00fSHugo Mills 5108abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 5109abccd00fSHugo Mills 5110abccd00fSHugo Mills if (ret) 5111abccd00fSHugo Mills goto out; 5112abccd00fSHugo Mills 51138ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 51148ea05e3aSAlexander Block if (ret) 51158ea05e3aSAlexander Block ret = -EFAULT; 51168ea05e3aSAlexander Block 51178ea05e3aSAlexander Block out: 51188ea05e3aSAlexander Block kfree(sa); 51198ea05e3aSAlexander Block return ret; 51208ea05e3aSAlexander Block } 51218ea05e3aSAlexander Block 5122867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 5123867ab667Sjeff.liu { 51246d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5125a1b83ac5SAnand Jain size_t len; 5126867ab667Sjeff.liu int ret; 5127a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5128a1b83ac5SAnand Jain 5129a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5130a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 5131a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5132a1b83ac5SAnand Jain 5133a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5134867ab667Sjeff.liu 5135867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 5136efe120a0SFrank Holton btrfs_warn(root->fs_info, 5137efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5138867ab667Sjeff.liu } 5139867ab667Sjeff.liu 5140867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5141867ab667Sjeff.liu 5142867ab667Sjeff.liu return ret ? -EFAULT : 0; 5143867ab667Sjeff.liu } 5144867ab667Sjeff.liu 5145a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5146a8bfd4abSjeff.liu { 51476d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5148a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5149a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5150a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5151a8bfd4abSjeff.liu int ret; 5152a8bfd4abSjeff.liu 5153a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5154a8bfd4abSjeff.liu return -EPERM; 5155a8bfd4abSjeff.liu 5156a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5157a8bfd4abSjeff.liu return -EFAULT; 5158a8bfd4abSjeff.liu 5159a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5160efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5161a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5162a8bfd4abSjeff.liu return -EINVAL; 5163a8bfd4abSjeff.liu } 5164a8bfd4abSjeff.liu 5165a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5166a8bfd4abSjeff.liu if (ret) 5167a8bfd4abSjeff.liu return ret; 5168a8bfd4abSjeff.liu 5169a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5170a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5171a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5172a8bfd4abSjeff.liu goto out_unlock; 5173a8bfd4abSjeff.liu } 5174a8bfd4abSjeff.liu 5175a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5176a8bfd4abSjeff.liu strcpy(super_block->label, label); 5177a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5178d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5179a8bfd4abSjeff.liu 5180a8bfd4abSjeff.liu out_unlock: 5181a8bfd4abSjeff.liu mnt_drop_write_file(file); 5182a8bfd4abSjeff.liu return ret; 5183a8bfd4abSjeff.liu } 5184a8bfd4abSjeff.liu 51852eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 51862eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 51872eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 51882eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 51892eaa055fSJeff Mahoney 5190*d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 51912eaa055fSJeff Mahoney { 51924d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 51932eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 51942eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 51952eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 51962eaa055fSJeff Mahoney }; 51972eaa055fSJeff Mahoney 51982eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 51992eaa055fSJeff Mahoney return -EFAULT; 52002eaa055fSJeff Mahoney 52012eaa055fSJeff Mahoney return 0; 52022eaa055fSJeff Mahoney } 52032eaa055fSJeff Mahoney 52042eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 52052eaa055fSJeff Mahoney { 52062eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52072eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 52082eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 52092eaa055fSJeff Mahoney 52102eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 52112eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 52122eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 52132eaa055fSJeff Mahoney 52142eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 52152eaa055fSJeff Mahoney return -EFAULT; 52162eaa055fSJeff Mahoney 52172eaa055fSJeff Mahoney return 0; 52182eaa055fSJeff Mahoney } 52192eaa055fSJeff Mahoney 52203b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 52213b02a68aSJeff Mahoney enum btrfs_feature_set set, 52222eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 52232eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 52242eaa055fSJeff Mahoney { 52253b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 52263b02a68aSJeff Mahoney char *names; 52272eaa055fSJeff Mahoney u64 disallowed, unsupported; 52282eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 52292eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 52302eaa055fSJeff Mahoney 52312eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 52322eaa055fSJeff Mahoney if (unsupported) { 52333b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 52343b02a68aSJeff Mahoney if (names) { 52353b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 52363b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 52373b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 52383b02a68aSJeff Mahoney kfree(names); 52393b02a68aSJeff Mahoney } else 52402eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 52412eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 52422eaa055fSJeff Mahoney type, unsupported); 52432eaa055fSJeff Mahoney return -EOPNOTSUPP; 52442eaa055fSJeff Mahoney } 52452eaa055fSJeff Mahoney 52462eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 52472eaa055fSJeff Mahoney if (disallowed) { 52483b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 52493b02a68aSJeff Mahoney if (names) { 52503b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 52513b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 52523b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 52533b02a68aSJeff Mahoney kfree(names); 52543b02a68aSJeff Mahoney } else 52552eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 52562eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 52572eaa055fSJeff Mahoney type, disallowed); 52582eaa055fSJeff Mahoney return -EPERM; 52592eaa055fSJeff Mahoney } 52602eaa055fSJeff Mahoney 52612eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 52622eaa055fSJeff Mahoney if (disallowed) { 52633b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 52643b02a68aSJeff Mahoney if (names) { 52653b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 52663b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 52673b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 52683b02a68aSJeff Mahoney kfree(names); 52693b02a68aSJeff Mahoney } else 52702eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 52712eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 52722eaa055fSJeff Mahoney type, disallowed); 52732eaa055fSJeff Mahoney return -EPERM; 52742eaa055fSJeff Mahoney } 52752eaa055fSJeff Mahoney 52762eaa055fSJeff Mahoney return 0; 52772eaa055fSJeff Mahoney } 52782eaa055fSJeff Mahoney 52792eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 52803b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 52812eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 52822eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 52832eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 52842eaa055fSJeff Mahoney 52852eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 52862eaa055fSJeff Mahoney { 52872eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52882eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 52892eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 52902eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 52912eaa055fSJeff Mahoney u64 newflags; 52922eaa055fSJeff Mahoney int ret; 52932eaa055fSJeff Mahoney 52942eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 52952eaa055fSJeff Mahoney return -EPERM; 52962eaa055fSJeff Mahoney 52972eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 52982eaa055fSJeff Mahoney return -EFAULT; 52992eaa055fSJeff Mahoney 53002eaa055fSJeff Mahoney /* Nothing to do */ 53012eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 53022eaa055fSJeff Mahoney !flags[0].incompat_flags) 53032eaa055fSJeff Mahoney return 0; 53042eaa055fSJeff Mahoney 53052eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 53062eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 53072eaa055fSJeff Mahoney if (ret) 53082eaa055fSJeff Mahoney return ret; 53092eaa055fSJeff Mahoney 53102eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 53112eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 53122eaa055fSJeff Mahoney if (ret) 53132eaa055fSJeff Mahoney return ret; 53142eaa055fSJeff Mahoney 53152eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 53162eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 53172eaa055fSJeff Mahoney if (ret) 53182eaa055fSJeff Mahoney return ret; 53192eaa055fSJeff Mahoney 53208051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 53212eaa055fSJeff Mahoney if (IS_ERR(trans)) 53222eaa055fSJeff Mahoney return PTR_ERR(trans); 53232eaa055fSJeff Mahoney 53242eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 53252eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 53262eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 53272eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 53282eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 53292eaa055fSJeff Mahoney 53302eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 53312eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 53322eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 53332eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 53342eaa055fSJeff Mahoney 53352eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 53362eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 53372eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 53382eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 53392eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 53402eaa055fSJeff Mahoney 5341d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 53422eaa055fSJeff Mahoney } 53432eaa055fSJeff Mahoney 5344f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5345f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5346f46b5a66SChristoph Hellwig { 5347496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 53484bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5349f46b5a66SChristoph Hellwig 5350f46b5a66SChristoph Hellwig switch (cmd) { 53516cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 53526cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 53536cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 53546cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 53556cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 53566cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5357f7039b1dSLi Dongyang case FITRIM: 5358f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5359f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5360fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5361fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5362fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 53633de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5364fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 53656f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 53666f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 536776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 536876dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 53690caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 53700caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 53710caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 53720caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 53736ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 53746ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5375f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 53761e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 53771e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 53781e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5379f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5380198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5381f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 53824bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5383f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5384da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5385475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5386475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5387475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5388475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5389f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 53909ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5391f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5392f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5393f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5394f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5395ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5396ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5397cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5398cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5399ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5400ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5401d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5402d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5403d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5404d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 54051406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54061406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 54079b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54089b199859SFilipe David Borba Manana int ret; 54099b199859SFilipe David Borba Manana 54106c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 54119b199859SFilipe David Borba Manana if (ret) 54129b199859SFilipe David Borba Manana return ret; 5413ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 54142fad4e83SDavid Sterba /* 54152fad4e83SDavid Sterba * The transaction thread may want to do more work, 54162fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 54172fad4e83SDavid Sterba * processing uncleaned subvols. 54182fad4e83SDavid Sterba */ 54192fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 54209b199859SFilipe David Borba Manana return ret; 54219b199859SFilipe David Borba Manana } 542246204592SSage Weil case BTRFS_IOC_START_SYNC: 54239a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 542446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 54259a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5426475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5427b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5428475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5429475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5430475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5431475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5432c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 54339ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5434837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5435837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 543619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 543719a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 54388ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 54398ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5440abccd00fSHugo Mills #ifdef CONFIG_64BIT 5441abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5442abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5443abccd00fSHugo Mills #endif 544431db9f7cSAlexander Block case BTRFS_IOC_SEND: 544531db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5446c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5447b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 54485d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5449905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 54505d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5451905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 54525d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5453905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 54545d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5455905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 54562f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 54572f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 54582f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 54592f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 546057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 546157254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 54623f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 54633f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5464867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5465867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5466a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5467a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 54682eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5469*d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 54702eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 54712eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 54722eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 54732eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5474f46b5a66SChristoph Hellwig } 5475f46b5a66SChristoph Hellwig 5476f46b5a66SChristoph Hellwig return -ENOTTY; 5477f46b5a66SChristoph Hellwig } 5478