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, 90416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 91416161dbSMark Fasheh 926cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 936cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 946cbff00fSChristoph Hellwig { 956cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 966cbff00fSChristoph Hellwig return flags; 976cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 986cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 996cbff00fSChristoph Hellwig else 1006cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1016cbff00fSChristoph Hellwig } 102f46b5a66SChristoph Hellwig 1036cbff00fSChristoph Hellwig /* 1046cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1056cbff00fSChristoph Hellwig */ 1066cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 125d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 126d0092bddSLi Zefan iflags |= FS_COMPR_FL; 127d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 128d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1366cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1386cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1436cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1456cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1476cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1496cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig /* 1586cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1596cbff00fSChristoph Hellwig * 160e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1616cbff00fSChristoph Hellwig */ 1626cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1636cbff00fSChristoph Hellwig { 1640b4dcea5SChris Mason unsigned int flags; 1650b4dcea5SChris Mason 1660b4dcea5SChris Mason if (!dir) 1670b4dcea5SChris Mason return; 1680b4dcea5SChris Mason 1690b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1706cbff00fSChristoph Hellwig 171e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 172e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 173e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 174e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 175e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 176e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 177e27425d6SJosef Bacik } 1786cbff00fSChristoph Hellwig 179213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 180e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 181213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 182213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 183213490b3SLiu Bo } 184e27425d6SJosef Bacik 1856cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1866cbff00fSChristoph Hellwig } 1876cbff00fSChristoph Hellwig 1886cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1896cbff00fSChristoph Hellwig { 190496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1916cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1926cbff00fSChristoph Hellwig 1936cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1946cbff00fSChristoph Hellwig return -EFAULT; 1956cbff00fSChristoph Hellwig return 0; 1966cbff00fSChristoph Hellwig } 1976cbff00fSChristoph Hellwig 19875e7cb7fSLiu Bo static int check_flags(unsigned int flags) 19975e7cb7fSLiu Bo { 20075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 203e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 204e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20575e7cb7fSLiu Bo return -EOPNOTSUPP; 20675e7cb7fSLiu Bo 20775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20875e7cb7fSLiu Bo return -EINVAL; 20975e7cb7fSLiu Bo 21075e7cb7fSLiu Bo return 0; 21175e7cb7fSLiu Bo } 21275e7cb7fSLiu Bo 2136cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2146cbff00fSChristoph Hellwig { 215496ad9aaSAl Viro struct inode *inode = file_inode(file); 2166cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2176cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2186cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2196cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2206cbff00fSChristoph Hellwig int ret; 221f062abf0SLi Zefan u64 ip_oldflags; 222f062abf0SLi Zefan unsigned int i_oldflags; 2237e97b8daSDavid Sterba umode_t mode; 2246cbff00fSChristoph Hellwig 225bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 226bd60ea0fSDavid Sterba return -EPERM; 227bd60ea0fSDavid Sterba 228b83cc969SLi Zefan if (btrfs_root_readonly(root)) 229b83cc969SLi Zefan return -EROFS; 230b83cc969SLi Zefan 2316cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2326cbff00fSChristoph Hellwig return -EFAULT; 2336cbff00fSChristoph Hellwig 23475e7cb7fSLiu Bo ret = check_flags(flags); 23575e7cb7fSLiu Bo if (ret) 23675e7cb7fSLiu Bo return ret; 2376cbff00fSChristoph Hellwig 238e7848683SJan Kara ret = mnt_want_write_file(file); 239e7848683SJan Kara if (ret) 240e7848683SJan Kara return ret; 241e7848683SJan Kara 2426cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2436cbff00fSChristoph Hellwig 244f062abf0SLi Zefan ip_oldflags = ip->flags; 245f062abf0SLi Zefan i_oldflags = inode->i_flags; 2467e97b8daSDavid Sterba mode = inode->i_mode; 247f062abf0SLi Zefan 2486cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2496cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2506cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2516cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2526cbff00fSChristoph Hellwig ret = -EPERM; 2536cbff00fSChristoph Hellwig goto out_unlock; 2546cbff00fSChristoph Hellwig } 2556cbff00fSChristoph Hellwig } 2566cbff00fSChristoph Hellwig 2576cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2586cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2596cbff00fSChristoph Hellwig else 2606cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2616cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2626cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2636cbff00fSChristoph Hellwig else 2646cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2656cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2666cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2676cbff00fSChristoph Hellwig else 2686cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2696cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2706cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2716cbff00fSChristoph Hellwig else 2726cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2736cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2746cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2756cbff00fSChristoph Hellwig else 2766cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2776cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2786cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2796cbff00fSChristoph Hellwig else 2806cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2817e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2827e97b8daSDavid Sterba if (S_ISREG(mode)) { 2837e97b8daSDavid Sterba /* 2847e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2857e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2867e97b8daSDavid Sterba * status of the file and will not set it. 2877e97b8daSDavid Sterba */ 2887e97b8daSDavid Sterba if (inode->i_size == 0) 2897e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2907e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2917e97b8daSDavid Sterba } else { 292e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2937e97b8daSDavid Sterba } 2947e97b8daSDavid Sterba } else { 2957e97b8daSDavid Sterba /* 2967e97b8daSDavid Sterba * Revert back under same assuptions as above 2977e97b8daSDavid Sterba */ 2987e97b8daSDavid Sterba if (S_ISREG(mode)) { 2997e97b8daSDavid Sterba if (inode->i_size == 0) 3007e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 3017e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 3027e97b8daSDavid Sterba } else { 303e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3047e97b8daSDavid Sterba } 3057e97b8daSDavid Sterba } 3066cbff00fSChristoph Hellwig 30775e7cb7fSLiu Bo /* 30875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 31075e7cb7fSLiu Bo * things smaller. 31175e7cb7fSLiu Bo */ 31275e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 31375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31563541927SFilipe David Borba Manana 31663541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31763541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31863541927SFilipe David Borba Manana goto out_drop; 31975e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 32063541927SFilipe David Borba Manana const char *comp; 32163541927SFilipe David Borba Manana 32275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 32375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32463541927SFilipe David Borba Manana 32563541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32663541927SFilipe David Borba Manana comp = "lzo"; 32763541927SFilipe David Borba Manana else 32863541927SFilipe David Borba Manana comp = "zlib"; 32963541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 33063541927SFilipe David Borba Manana comp, strlen(comp), 0); 33163541927SFilipe David Borba Manana if (ret) 33263541927SFilipe David Borba Manana goto out_drop; 33363541927SFilipe David Borba Manana 334ebcb904dSLi Zefan } else { 33578a017a2SFilipe Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 33678a017a2SFilipe Manana if (ret && ret != -ENODATA) 33778a017a2SFilipe Manana goto out_drop; 338ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 33975e7cb7fSLiu Bo } 3406cbff00fSChristoph Hellwig 3414da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 342f062abf0SLi Zefan if (IS_ERR(trans)) { 343f062abf0SLi Zefan ret = PTR_ERR(trans); 344f062abf0SLi Zefan goto out_drop; 345f062abf0SLi Zefan } 3466cbff00fSChristoph Hellwig 347306424ccSLi Zefan btrfs_update_iflags(inode); 3480c4d2d95SJosef Bacik inode_inc_iversion(inode); 349306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3506cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3516cbff00fSChristoph Hellwig 3526cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 353f062abf0SLi Zefan out_drop: 354f062abf0SLi Zefan if (ret) { 355f062abf0SLi Zefan ip->flags = ip_oldflags; 356f062abf0SLi Zefan inode->i_flags = i_oldflags; 357f062abf0SLi Zefan } 3586cbff00fSChristoph Hellwig 3596cbff00fSChristoph Hellwig out_unlock: 3606cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 361e7848683SJan Kara mnt_drop_write_file(file); 3622d4e6f6aSliubo return ret; 3636cbff00fSChristoph Hellwig } 3646cbff00fSChristoph Hellwig 3656cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3666cbff00fSChristoph Hellwig { 367496ad9aaSAl Viro struct inode *inode = file_inode(file); 3686cbff00fSChristoph Hellwig 3696cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3706cbff00fSChristoph Hellwig } 371f46b5a66SChristoph Hellwig 372f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 373f7039b1dSLi Dongyang { 37454563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 375f7039b1dSLi Dongyang struct btrfs_device *device; 376f7039b1dSLi Dongyang struct request_queue *q; 377f7039b1dSLi Dongyang struct fstrim_range range; 378f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 379f7039b1dSLi Dongyang u64 num_devices = 0; 380815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 381f7039b1dSLi Dongyang int ret; 382f7039b1dSLi Dongyang 383f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 384f7039b1dSLi Dongyang return -EPERM; 385f7039b1dSLi Dongyang 3861f78160cSXiao Guangrong rcu_read_lock(); 3871f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3881f78160cSXiao Guangrong dev_list) { 389f7039b1dSLi Dongyang if (!device->bdev) 390f7039b1dSLi Dongyang continue; 391f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 392f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 393f7039b1dSLi Dongyang num_devices++; 394f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 395f7039b1dSLi Dongyang minlen); 396f7039b1dSLi Dongyang } 397f7039b1dSLi Dongyang } 3981f78160cSXiao Guangrong rcu_read_unlock(); 399f4c697e6SLukas Czerner 400f7039b1dSLi Dongyang if (!num_devices) 401f7039b1dSLi Dongyang return -EOPNOTSUPP; 402f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 403f7039b1dSLi Dongyang return -EFAULT; 404e515c18bSLukas Czerner if (range.start > total_bytes || 405e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 406f4c697e6SLukas Czerner return -EINVAL; 407f7039b1dSLi Dongyang 408f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 409f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 410815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 411f7039b1dSLi Dongyang if (ret < 0) 412f7039b1dSLi Dongyang return ret; 413f7039b1dSLi Dongyang 414f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 415f7039b1dSLi Dongyang return -EFAULT; 416f7039b1dSLi Dongyang 417f7039b1dSLi Dongyang return 0; 418f7039b1dSLi Dongyang } 419f7039b1dSLi Dongyang 420dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 421dd5f9615SStefan Behrens { 42246e0f66aSChris Mason int i; 42346e0f66aSChris Mason 42446e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 42546e0f66aSChris Mason if (uuid[i]) 42646e0f66aSChris Mason return 0; 42746e0f66aSChris Mason } 42846e0f66aSChris Mason return 1; 429dd5f9615SStefan Behrens } 430dd5f9615SStefan Behrens 431d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 432cb8e7090SChristoph Hellwig struct dentry *dentry, 43372fd032eSSage Weil char *name, int namelen, 4346f72c7e2SArne Jansen u64 *async_transid, 4358696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 436f46b5a66SChristoph Hellwig { 437f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 438f46b5a66SChristoph Hellwig struct btrfs_key key; 439f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 440f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 441f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 442d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 44376dda93cSYan, Zheng struct btrfs_root *new_root; 444d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4458ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4465662344bSTsutomu Itoh struct inode *inode; 447f46b5a66SChristoph Hellwig int ret; 448f46b5a66SChristoph Hellwig int err; 449f46b5a66SChristoph Hellwig u64 objectid; 450f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4513de4586cSChris Mason u64 index = 0; 452d5c12070SMiao Xie u64 qgroup_reserved; 4538ea05e3aSAlexander Block uuid_le new_uuid; 454f46b5a66SChristoph Hellwig 455581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4562fbe8c8aSAl Viro if (ret) 457a22285a6SYan, Zheng return ret; 4586a912213SJosef Bacik 459e09fe2d2SQu Wenruo /* 460e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 461e09fe2d2SQu Wenruo * screwed up since it assume subvolme qgroup's level to be 0. 462e09fe2d2SQu Wenruo */ 463e09fe2d2SQu Wenruo if (btrfs_qgroup_level(objectid)) 464e09fe2d2SQu Wenruo return -ENOSPC; 465e09fe2d2SQu Wenruo 466d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4679ed74f2dSJosef Bacik /* 468d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 469d5c12070SMiao Xie * of create_snapshot(). 4709ed74f2dSJosef Bacik */ 471d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 472dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 473d5c12070SMiao Xie if (ret) 474d5c12070SMiao Xie return ret; 475f46b5a66SChristoph Hellwig 476d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 477d5c12070SMiao Xie if (IS_ERR(trans)) { 478d5c12070SMiao Xie ret = PTR_ERR(trans); 479de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 480de6e8200SLiu Bo qgroup_reserved); 481de6e8200SLiu Bo return ret; 482d5c12070SMiao Xie } 483d5c12070SMiao Xie trans->block_rsv = &block_rsv; 484d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 485f46b5a66SChristoph Hellwig 4868696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4876f72c7e2SArne Jansen if (ret) 4886f72c7e2SArne Jansen goto fail; 4896f72c7e2SArne Jansen 4904d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 4918e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4928e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4938e8a1e31SJosef Bacik goto fail; 4948e8a1e31SJosef Bacik } 495f46b5a66SChristoph Hellwig 4965d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 497f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 498f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4995d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 500f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 501f46b5a66SChristoph Hellwig 5020a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 503f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 5045d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 505b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 5065d4f98a2SYan Zheng BTRFS_UUID_SIZE); 507f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 508f46b5a66SChristoph Hellwig 5098ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 5108ea05e3aSAlexander Block 511f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5123cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5133cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5143cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 515707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 5163cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 517f46b5a66SChristoph Hellwig 5183cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5193cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5203cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 52108fe4db1SLi Zefan 522f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 52384234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 524f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 525f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 52686b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 52780ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 528f46b5a66SChristoph Hellwig 5298ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5308ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5318ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5328ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5333cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5343cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5358ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5368ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5378ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 538f46b5a66SChristoph Hellwig 539925baeddSChris Mason btrfs_tree_unlock(leaf); 540f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 541f46b5a66SChristoph Hellwig leaf = NULL; 542f46b5a66SChristoph Hellwig 543f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 544f46b5a66SChristoph Hellwig 545f46b5a66SChristoph Hellwig key.objectid = objectid; 5465d4f98a2SYan Zheng key.offset = 0; 547962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 548f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 549f46b5a66SChristoph Hellwig &root_item); 550f46b5a66SChristoph Hellwig if (ret) 551f46b5a66SChristoph Hellwig goto fail; 552f46b5a66SChristoph Hellwig 55376dda93cSYan, Zheng key.offset = (u64)-1; 55476dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 55579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 55679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 55779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 55879787eaaSJeff Mahoney goto fail; 55979787eaaSJeff Mahoney } 56076dda93cSYan, Zheng 56176dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 56276dda93cSYan, Zheng 56363541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 564ce598979SMark Fasheh if (ret) { 565ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 56679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 567ce598979SMark Fasheh goto fail; 568ce598979SMark Fasheh } 569ce598979SMark Fasheh 570f46b5a66SChristoph Hellwig /* 571f46b5a66SChristoph Hellwig * insert the directory item 572f46b5a66SChristoph Hellwig */ 5733de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 57479787eaaSJeff Mahoney if (ret) { 57579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 57679787eaaSJeff Mahoney goto fail; 57779787eaaSJeff Mahoney } 5783de4586cSChris Mason 5793de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 58016cdcec7SMiao Xie name, namelen, dir, &key, 5813de4586cSChris Mason BTRFS_FT_DIR, index); 58279787eaaSJeff Mahoney if (ret) { 58379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 584f46b5a66SChristoph Hellwig goto fail; 58579787eaaSJeff Mahoney } 5860660b5afSChris Mason 58752c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 58852c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 58952c26179SYan Zheng BUG_ON(ret); 59052c26179SYan Zheng 5910660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5924df27c4dSYan, Zheng objectid, root->root_key.objectid, 59333345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5940660b5afSChris Mason BUG_ON(ret); 5950660b5afSChris Mason 596dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 597dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 598dd5f9615SStefan Behrens objectid); 599dd5f9615SStefan Behrens if (ret) 600dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 601dd5f9615SStefan Behrens 602f46b5a66SChristoph Hellwig fail: 603d5c12070SMiao Xie trans->block_rsv = NULL; 604d5c12070SMiao Xie trans->bytes_reserved = 0; 605de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 606de6e8200SLiu Bo 60772fd032eSSage Weil if (async_transid) { 60872fd032eSSage Weil *async_transid = trans->transid; 60972fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 61000d71c9cSMiao Xie if (err) 61100d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 61272fd032eSSage Weil } else { 61376dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 61472fd032eSSage Weil } 615f46b5a66SChristoph Hellwig if (err && !ret) 616f46b5a66SChristoph Hellwig ret = err; 6171a65e24bSChris Mason 6185662344bSTsutomu Itoh if (!ret) { 6195662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 620de6e8200SLiu Bo if (IS_ERR(inode)) 621de6e8200SLiu Bo return PTR_ERR(inode); 6225662344bSTsutomu Itoh d_instantiate(dentry, inode); 6235662344bSTsutomu Itoh } 624f46b5a66SChristoph Hellwig return ret; 625f46b5a66SChristoph Hellwig } 626f46b5a66SChristoph Hellwig 6279ea24bbeSFilipe Manana static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) 6288257b2dcSMiao Xie { 6298257b2dcSMiao Xie s64 writers; 6308257b2dcSMiao Xie DEFINE_WAIT(wait); 6318257b2dcSMiao Xie 6328257b2dcSMiao Xie do { 6338257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6348257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6358257b2dcSMiao Xie 6368257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6378257b2dcSMiao Xie if (writers) 6388257b2dcSMiao Xie schedule(); 6398257b2dcSMiao Xie 6408257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6418257b2dcSMiao Xie } while (writers); 6428257b2dcSMiao Xie } 6438257b2dcSMiao Xie 644e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 645e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 646e9662f70SMiao Xie u64 *async_transid, bool readonly, 647e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 648f46b5a66SChristoph Hellwig { 6492e4bfab9SYan, Zheng struct inode *inode; 650f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 651f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6522e4bfab9SYan, Zheng int ret; 653f46b5a66SChristoph Hellwig 65427cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 655f46b5a66SChristoph Hellwig return -EINVAL; 656f46b5a66SChristoph Hellwig 6578257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6584e857c58SPeter Zijlstra smp_mb__after_atomic(); 6599ea24bbeSFilipe Manana btrfs_wait_for_no_snapshoting_writes(root); 6608257b2dcSMiao Xie 6616a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6626a03843dSMiao Xie if (ret) 6638257b2dcSMiao Xie goto out; 6646a03843dSMiao Xie 665b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6666a03843dSMiao Xie 667a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 6688257b2dcSMiao Xie if (!pending_snapshot) { 6698257b2dcSMiao Xie ret = -ENOMEM; 6708257b2dcSMiao Xie goto out; 6718257b2dcSMiao Xie } 672a22285a6SYan, Zheng 67366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 67466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 675d5c12070SMiao Xie /* 676d5c12070SMiao Xie * 1 - parent dir inode 677d5c12070SMiao Xie * 2 - dir entries 678d5c12070SMiao Xie * 1 - root item 679d5c12070SMiao Xie * 2 - root ref/backref 680d5c12070SMiao Xie * 1 - root of snapshot 681dd5f9615SStefan Behrens * 1 - UUID item 682d5c12070SMiao Xie */ 683d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 684dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 685ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 686ee3441b4SJeff Mahoney false); 687d5c12070SMiao Xie if (ret) 6888257b2dcSMiao Xie goto free; 689d5c12070SMiao Xie 690a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 691a22285a6SYan, Zheng pending_snapshot->root = root; 692b83cc969SLi Zefan pending_snapshot->readonly = readonly; 693e9662f70SMiao Xie pending_snapshot->dir = dir; 6948696c533SMiao Xie pending_snapshot->inherit = inherit; 695a22285a6SYan, Zheng 696d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 697a22285a6SYan, Zheng if (IS_ERR(trans)) { 698a22285a6SYan, Zheng ret = PTR_ERR(trans); 699a22285a6SYan, Zheng goto fail; 700a22285a6SYan, Zheng } 701a22285a6SYan, Zheng 7028351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 703a22285a6SYan, Zheng list_add(&pending_snapshot->list, 704a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7058351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 70672fd032eSSage Weil if (async_transid) { 70772fd032eSSage Weil *async_transid = trans->transid; 70872fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 70972fd032eSSage Weil root->fs_info->extent_root, 1); 71000d71c9cSMiao Xie if (ret) 71100d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 71272fd032eSSage Weil } else { 71372fd032eSSage Weil ret = btrfs_commit_transaction(trans, 71472fd032eSSage Weil root->fs_info->extent_root); 71572fd032eSSage Weil } 716aec8030aSMiao Xie if (ret) 717c37b2b62SJosef Bacik goto fail; 718a22285a6SYan, Zheng 719a22285a6SYan, Zheng ret = pending_snapshot->error; 720f46b5a66SChristoph Hellwig if (ret) 7212e4bfab9SYan, Zheng goto fail; 722f46b5a66SChristoph Hellwig 723d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 724d3797308SChris Mason if (ret) 725d3797308SChris Mason goto fail; 726d3797308SChris Mason 7272fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 7282e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7292e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7302e4bfab9SYan, Zheng goto fail; 7312e4bfab9SYan, Zheng } 7325662344bSTsutomu Itoh 7332e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7342e4bfab9SYan, Zheng ret = 0; 7352e4bfab9SYan, Zheng fail: 736d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 737d5c12070SMiao Xie &pending_snapshot->block_rsv, 738d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 7398257b2dcSMiao Xie free: 740a22285a6SYan, Zheng kfree(pending_snapshot); 7418257b2dcSMiao Xie out: 7429ea24bbeSFilipe Manana if (atomic_dec_and_test(&root->will_be_snapshoted)) 7439ea24bbeSFilipe Manana wake_up_atomic_t(&root->will_be_snapshoted); 744f46b5a66SChristoph Hellwig return ret; 745f46b5a66SChristoph Hellwig } 746f46b5a66SChristoph Hellwig 7474260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7484260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7494260f7c7SSage Weil * whether the type of victim is right. 7504260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7514260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7524260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7534260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7544260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7554260f7c7SSage Weil * a. be owner of dir, or 7564260f7c7SSage Weil * b. be owner of victim, or 7574260f7c7SSage Weil * c. have CAP_FOWNER capability 7584260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7594260f7c7SSage Weil * links pointing to it. 7604260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7614260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7624260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7634260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7644260f7c7SSage Weil * nfs_async_unlink(). 7654260f7c7SSage Weil */ 7664260f7c7SSage Weil 7674260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7684260f7c7SSage Weil { 7694260f7c7SSage Weil int error; 7704260f7c7SSage Weil 7714260f7c7SSage Weil if (!victim->d_inode) 7724260f7c7SSage Weil return -ENOENT; 7734260f7c7SSage Weil 7744260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7754fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7764260f7c7SSage Weil 7774260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7784260f7c7SSage Weil if (error) 7794260f7c7SSage Weil return error; 7804260f7c7SSage Weil if (IS_APPEND(dir)) 7814260f7c7SSage Weil return -EPERM; 782cbdf35bcSMiklos Szeredi if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) || 7834260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7844260f7c7SSage Weil return -EPERM; 7854260f7c7SSage Weil if (isdir) { 786e36cb0b8SDavid Howells if (!d_is_dir(victim)) 7874260f7c7SSage Weil return -ENOTDIR; 7884260f7c7SSage Weil if (IS_ROOT(victim)) 7894260f7c7SSage Weil return -EBUSY; 790e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 7914260f7c7SSage Weil return -EISDIR; 7924260f7c7SSage Weil if (IS_DEADDIR(dir)) 7934260f7c7SSage Weil return -ENOENT; 7944260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7954260f7c7SSage Weil return -EBUSY; 7964260f7c7SSage Weil return 0; 7974260f7c7SSage Weil } 7984260f7c7SSage Weil 799cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 800cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 801cb8e7090SChristoph Hellwig { 802cb8e7090SChristoph Hellwig if (child->d_inode) 803cb8e7090SChristoph Hellwig return -EEXIST; 804cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 805cb8e7090SChristoph Hellwig return -ENOENT; 806cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 807cb8e7090SChristoph Hellwig } 808cb8e7090SChristoph Hellwig 809cb8e7090SChristoph Hellwig /* 810cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 811cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 812cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 813cb8e7090SChristoph Hellwig */ 81476dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 81576dda93cSYan, Zheng char *name, int namelen, 81672fd032eSSage Weil struct btrfs_root *snap_src, 8176f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8188696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 819cb8e7090SChristoph Hellwig { 82076dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 821cb8e7090SChristoph Hellwig struct dentry *dentry; 822cb8e7090SChristoph Hellwig int error; 823cb8e7090SChristoph Hellwig 8245c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8255c50c9b8SDavid Sterba if (error == -EINTR) 8265c50c9b8SDavid Sterba return error; 827cb8e7090SChristoph Hellwig 828cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 829cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 830cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 831cb8e7090SChristoph Hellwig goto out_unlock; 832cb8e7090SChristoph Hellwig 833cb8e7090SChristoph Hellwig error = -EEXIST; 834cb8e7090SChristoph Hellwig if (dentry->d_inode) 835cb8e7090SChristoph Hellwig goto out_dput; 836cb8e7090SChristoph Hellwig 83776dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 838cb8e7090SChristoph Hellwig if (error) 839a874a63eSLiu Bo goto out_dput; 840cb8e7090SChristoph Hellwig 8419c52057cSChris Mason /* 8429c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8439c52057cSChris Mason * check for them now when we can safely fail 8449c52057cSChris Mason */ 8459c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8469c52057cSChris Mason dir->i_ino, name, 8479c52057cSChris Mason namelen); 8489c52057cSChris Mason if (error) 8499c52057cSChris Mason goto out_dput; 8509c52057cSChris Mason 85176dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 85276dda93cSYan, Zheng 85376dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 85476dda93cSYan, Zheng goto out_up_read; 85576dda93cSYan, Zheng 8563de4586cSChris Mason if (snap_src) { 857e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8586f72c7e2SArne Jansen async_transid, readonly, inherit); 8593de4586cSChris Mason } else { 860d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 861d5c12070SMiao Xie async_transid, inherit); 8623de4586cSChris Mason } 86376dda93cSYan, Zheng if (!error) 86476dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 86576dda93cSYan, Zheng out_up_read: 86676dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 867cb8e7090SChristoph Hellwig out_dput: 868cb8e7090SChristoph Hellwig dput(dentry); 869cb8e7090SChristoph Hellwig out_unlock: 87076dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 871cb8e7090SChristoph Hellwig return error; 872cb8e7090SChristoph Hellwig } 873cb8e7090SChristoph Hellwig 8744cb5300bSChris Mason /* 8754cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8764cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8774cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8784cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8794cb5300bSChris Mason * part of the file 8804cb5300bSChris Mason */ 881aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 8824cb5300bSChris Mason { 8834cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8844cb5300bSChris Mason struct extent_map *em = NULL; 8854cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8864cb5300bSChris Mason u64 end; 8874cb5300bSChris Mason 8884cb5300bSChris Mason read_lock(&em_tree->lock); 8894cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8904cb5300bSChris Mason read_unlock(&em_tree->lock); 8914cb5300bSChris Mason 8924cb5300bSChris Mason if (em) { 8934cb5300bSChris Mason end = extent_map_end(em); 8944cb5300bSChris Mason free_extent_map(em); 8954cb5300bSChris Mason if (end - offset > thresh) 8964cb5300bSChris Mason return 0; 8974cb5300bSChris Mason } 8984cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8994cb5300bSChris Mason thresh /= 2; 9004cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9014cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9024cb5300bSChris Mason if (end >= thresh) 9034cb5300bSChris Mason return 0; 9044cb5300bSChris Mason return 1; 9054cb5300bSChris Mason } 9064cb5300bSChris Mason 9074cb5300bSChris Mason /* 9084cb5300bSChris Mason * helper function to walk through a file and find extents 9094cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9104cb5300bSChris Mason * 9114cb5300bSChris Mason * This is used by the defragging code to find new and small 9124cb5300bSChris Mason * extents 9134cb5300bSChris Mason */ 9144cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9154cb5300bSChris Mason struct inode *inode, u64 newer_than, 916aab110abSDavid Sterba u64 *off, u32 thresh) 9174cb5300bSChris Mason { 9184cb5300bSChris Mason struct btrfs_path *path; 9194cb5300bSChris Mason struct btrfs_key min_key; 9204cb5300bSChris Mason struct extent_buffer *leaf; 9214cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9224cb5300bSChris Mason int type; 9234cb5300bSChris Mason int ret; 924a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9254cb5300bSChris Mason 9264cb5300bSChris Mason path = btrfs_alloc_path(); 9274cb5300bSChris Mason if (!path) 9284cb5300bSChris Mason return -ENOMEM; 9294cb5300bSChris Mason 930a4689d2bSDavid Sterba min_key.objectid = ino; 9314cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9324cb5300bSChris Mason min_key.offset = *off; 9334cb5300bSChris Mason 9344cb5300bSChris Mason while (1) { 9356174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9364cb5300bSChris Mason if (ret != 0) 9374cb5300bSChris Mason goto none; 938f094c9bdSFilipe Manana process_slot: 939a4689d2bSDavid Sterba if (min_key.objectid != ino) 9404cb5300bSChris Mason goto none; 9414cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9424cb5300bSChris Mason goto none; 9434cb5300bSChris Mason 9444cb5300bSChris Mason leaf = path->nodes[0]; 9454cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9464cb5300bSChris Mason struct btrfs_file_extent_item); 9474cb5300bSChris Mason 9484cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9494cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9504cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9514cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9524cb5300bSChris Mason *off = min_key.offset; 9534cb5300bSChris Mason btrfs_free_path(path); 9544cb5300bSChris Mason return 0; 9554cb5300bSChris Mason } 9564cb5300bSChris Mason 957f094c9bdSFilipe Manana path->slots[0]++; 958f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 959f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 960f094c9bdSFilipe Manana goto process_slot; 961f094c9bdSFilipe Manana } 962f094c9bdSFilipe Manana 9634cb5300bSChris Mason if (min_key.offset == (u64)-1) 9644cb5300bSChris Mason goto none; 9654cb5300bSChris Mason 9664cb5300bSChris Mason min_key.offset++; 9674cb5300bSChris Mason btrfs_release_path(path); 9684cb5300bSChris Mason } 9694cb5300bSChris Mason none: 9704cb5300bSChris Mason btrfs_free_path(path); 9714cb5300bSChris Mason return -ENOENT; 9724cb5300bSChris Mason } 9734cb5300bSChris Mason 9746c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 97517ce6ef8SLiu Bo { 97617ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 977940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9786c282eb4SLi Zefan struct extent_map *em; 9796c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 980940100a4SChris Mason 981940100a4SChris Mason /* 982940100a4SChris Mason * hopefully we have this extent in the tree already, try without 983940100a4SChris Mason * the full extent lock 984940100a4SChris Mason */ 985940100a4SChris Mason read_lock(&em_tree->lock); 986940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 987940100a4SChris Mason read_unlock(&em_tree->lock); 988940100a4SChris Mason 989940100a4SChris Mason if (!em) { 990308d9800SFilipe Manana struct extent_state *cached = NULL; 991308d9800SFilipe Manana u64 end = start + len - 1; 992308d9800SFilipe Manana 993940100a4SChris Mason /* get the big lock and read metadata off disk */ 994308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 995940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 996308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 997940100a4SChris Mason 9986cf8bfbfSDan Carpenter if (IS_ERR(em)) 9996c282eb4SLi Zefan return NULL; 1000940100a4SChris Mason } 1001940100a4SChris Mason 10026c282eb4SLi Zefan return em; 10036c282eb4SLi Zefan } 10046c282eb4SLi Zefan 10056c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10066c282eb4SLi Zefan { 10076c282eb4SLi Zefan struct extent_map *next; 10086c282eb4SLi Zefan bool ret = true; 10096c282eb4SLi Zefan 10106c282eb4SLi Zefan /* this is the last extent */ 10116c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10126c282eb4SLi Zefan return false; 10136c282eb4SLi Zefan 10146c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1015e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1016e9512d72SChris Mason ret = false; 1017e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1018e9512d72SChris Mason (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) 10196c282eb4SLi Zefan ret = false; 10206c282eb4SLi Zefan 10216c282eb4SLi Zefan free_extent_map(next); 10226c282eb4SLi Zefan return ret; 10236c282eb4SLi Zefan } 10246c282eb4SLi Zefan 1025aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1026a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1027a43a2111SAndrew Mahone int compress) 10286c282eb4SLi Zefan { 10296c282eb4SLi Zefan struct extent_map *em; 10306c282eb4SLi Zefan int ret = 1; 10316c282eb4SLi Zefan bool next_mergeable = true; 10326c282eb4SLi Zefan 10336c282eb4SLi Zefan /* 10346c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10356c282eb4SLi Zefan * defragging it 10366c282eb4SLi Zefan */ 10376c282eb4SLi Zefan if (start < *defrag_end) 10386c282eb4SLi Zefan return 1; 10396c282eb4SLi Zefan 10406c282eb4SLi Zefan *skip = 0; 10416c282eb4SLi Zefan 10426c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10436c282eb4SLi Zefan if (!em) 10446c282eb4SLi Zefan return 0; 10456c282eb4SLi Zefan 1046940100a4SChris Mason /* this will cover holes, and inline extents */ 104717ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1048940100a4SChris Mason ret = 0; 104917ce6ef8SLiu Bo goto out; 105017ce6ef8SLiu Bo } 105117ce6ef8SLiu Bo 10526c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1053940100a4SChris Mason /* 10546c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10556c282eb4SLi Zefan * real extent, don't bother defragging it 1056940100a4SChris Mason */ 1057a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10586c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1059940100a4SChris Mason ret = 0; 106017ce6ef8SLiu Bo out: 1061940100a4SChris Mason /* 1062940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1063940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1064940100a4SChris Mason * so that the next tiny extent will force a defrag. 1065940100a4SChris Mason * 1066940100a4SChris Mason * The end result of this is that tiny extents before a single big 1067940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1068940100a4SChris Mason */ 1069940100a4SChris Mason if (ret) { 1070940100a4SChris Mason *defrag_end = extent_map_end(em); 1071940100a4SChris Mason } else { 1072940100a4SChris Mason *last_len = 0; 1073940100a4SChris Mason *skip = extent_map_end(em); 1074940100a4SChris Mason *defrag_end = 0; 1075940100a4SChris Mason } 1076940100a4SChris Mason 1077940100a4SChris Mason free_extent_map(em); 1078940100a4SChris Mason return ret; 1079940100a4SChris Mason } 1080940100a4SChris Mason 10814cb5300bSChris Mason /* 10824cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10834cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10844cb5300bSChris Mason * to COW and defrag. 10854cb5300bSChris Mason * 10864cb5300bSChris Mason * It also makes sure the delalloc code has enough 10874cb5300bSChris Mason * dirty data to avoid making new small extents as part 10884cb5300bSChris Mason * of the defrag 10894cb5300bSChris Mason * 10904cb5300bSChris Mason * It's a good idea to start RA on this range 10914cb5300bSChris Mason * before calling this. 10924cb5300bSChris Mason */ 10934cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10944cb5300bSChris Mason struct page **pages, 10954cb5300bSChris Mason unsigned long start_index, 1096c41570c9SJustin Maggard unsigned long num_pages) 1097f46b5a66SChristoph Hellwig { 10984cb5300bSChris Mason unsigned long file_end; 10994cb5300bSChris Mason u64 isize = i_size_read(inode); 1100f46b5a66SChristoph Hellwig u64 page_start; 1101f46b5a66SChristoph Hellwig u64 page_end; 11021f12bd06SLiu Bo u64 page_cnt; 11034cb5300bSChris Mason int ret; 11044cb5300bSChris Mason int i; 11054cb5300bSChris Mason int i_done; 11064cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11074cb5300bSChris Mason struct extent_state *cached_state = NULL; 1108600a45e1SMiao Xie struct extent_io_tree *tree; 11093b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11104cb5300bSChris Mason 11114cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11121f12bd06SLiu Bo if (!isize || start_index > file_end) 11131f12bd06SLiu Bo return 0; 11141f12bd06SLiu Bo 11151f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11164cb5300bSChris Mason 11174cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 11181f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11194cb5300bSChris Mason if (ret) 11204cb5300bSChris Mason return ret; 11214cb5300bSChris Mason i_done = 0; 1122600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11234cb5300bSChris Mason 11244cb5300bSChris Mason /* step one, lock all the pages */ 11251f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11264cb5300bSChris Mason struct page *page; 1127600a45e1SMiao Xie again: 1128a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11293b16a4e3SJosef Bacik start_index + i, mask); 11304cb5300bSChris Mason if (!page) 11314cb5300bSChris Mason break; 11324cb5300bSChris Mason 1133600a45e1SMiao Xie page_start = page_offset(page); 1134600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1135600a45e1SMiao Xie while (1) { 1136308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1137308d9800SFilipe Manana 0, &cached_state); 1138600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1139600a45e1SMiao Xie page_start); 1140308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1141308d9800SFilipe Manana &cached_state, GFP_NOFS); 1142600a45e1SMiao Xie if (!ordered) 1143600a45e1SMiao Xie break; 1144600a45e1SMiao Xie 1145600a45e1SMiao Xie unlock_page(page); 1146600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1147600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1148600a45e1SMiao Xie lock_page(page); 11491f12bd06SLiu Bo /* 11501f12bd06SLiu Bo * we unlocked the page above, so we need check if 11511f12bd06SLiu Bo * it was released or not. 11521f12bd06SLiu Bo */ 11531f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11541f12bd06SLiu Bo unlock_page(page); 11551f12bd06SLiu Bo page_cache_release(page); 11561f12bd06SLiu Bo goto again; 11571f12bd06SLiu Bo } 1158600a45e1SMiao Xie } 1159600a45e1SMiao Xie 11604cb5300bSChris Mason if (!PageUptodate(page)) { 11614cb5300bSChris Mason btrfs_readpage(NULL, page); 11624cb5300bSChris Mason lock_page(page); 11634cb5300bSChris Mason if (!PageUptodate(page)) { 11644cb5300bSChris Mason unlock_page(page); 11654cb5300bSChris Mason page_cache_release(page); 11664cb5300bSChris Mason ret = -EIO; 11674cb5300bSChris Mason break; 11684cb5300bSChris Mason } 11694cb5300bSChris Mason } 1170600a45e1SMiao Xie 1171600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1172600a45e1SMiao Xie unlock_page(page); 1173600a45e1SMiao Xie page_cache_release(page); 1174600a45e1SMiao Xie goto again; 1175600a45e1SMiao Xie } 1176600a45e1SMiao Xie 11774cb5300bSChris Mason pages[i] = page; 11784cb5300bSChris Mason i_done++; 11794cb5300bSChris Mason } 11804cb5300bSChris Mason if (!i_done || ret) 11814cb5300bSChris Mason goto out; 11824cb5300bSChris Mason 11834cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11844cb5300bSChris Mason goto out; 11854cb5300bSChris Mason 11864cb5300bSChris Mason /* 11874cb5300bSChris Mason * so now we have a nice long stream of locked 11884cb5300bSChris Mason * and up to date pages, lets wait on them 11894cb5300bSChris Mason */ 11904cb5300bSChris Mason for (i = 0; i < i_done; i++) 11914cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11924cb5300bSChris Mason 11934cb5300bSChris Mason page_start = page_offset(pages[0]); 11944cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11954cb5300bSChris Mason 11964cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1197d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11984cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11994cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12009e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12019e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12024cb5300bSChris Mason 12031f12bd06SLiu Bo if (i_done != page_cnt) { 12049e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12059e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12069e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12074cb5300bSChris Mason btrfs_delalloc_release_space(inode, 12081f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12094cb5300bSChris Mason } 12104cb5300bSChris Mason 12114cb5300bSChris Mason 12129e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12139e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12144cb5300bSChris Mason 12154cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12164cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12174cb5300bSChris Mason GFP_NOFS); 12184cb5300bSChris Mason 12194cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12204cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12214cb5300bSChris Mason ClearPageChecked(pages[i]); 12224cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12234cb5300bSChris Mason set_page_dirty(pages[i]); 12244cb5300bSChris Mason unlock_page(pages[i]); 12254cb5300bSChris Mason page_cache_release(pages[i]); 12264cb5300bSChris Mason } 12274cb5300bSChris Mason return i_done; 12284cb5300bSChris Mason out: 12294cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12304cb5300bSChris Mason unlock_page(pages[i]); 12314cb5300bSChris Mason page_cache_release(pages[i]); 12324cb5300bSChris Mason } 12331f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12344cb5300bSChris Mason return ret; 12354cb5300bSChris Mason 12364cb5300bSChris Mason } 12374cb5300bSChris Mason 12384cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12394cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12404cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12414cb5300bSChris Mason { 12424cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12434cb5300bSChris Mason struct file_ra_state *ra = NULL; 12444cb5300bSChris Mason unsigned long last_index; 1245151a31b2SLi Zefan u64 isize = i_size_read(inode); 1246940100a4SChris Mason u64 last_len = 0; 1247940100a4SChris Mason u64 skip = 0; 1248940100a4SChris Mason u64 defrag_end = 0; 12494cb5300bSChris Mason u64 newer_off = range->start; 1250f46b5a66SChristoph Hellwig unsigned long i; 1251008873eaSLi Zefan unsigned long ra_index = 0; 1252f46b5a66SChristoph Hellwig int ret; 12534cb5300bSChris Mason int defrag_count = 0; 12541a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1255aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 1256c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1257c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12584cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12594cb5300bSChris Mason struct page **pages = NULL; 12604cb5300bSChris Mason 12610abd5b17SLiu Bo if (isize == 0) 12620abd5b17SLiu Bo return 0; 12630abd5b17SLiu Bo 12640abd5b17SLiu Bo if (range->start >= isize) 12650abd5b17SLiu Bo return -EINVAL; 12661a419d85SLi Zefan 12671a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12681a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12691a419d85SLi Zefan return -EINVAL; 12701a419d85SLi Zefan if (range->compress_type) 12711a419d85SLi Zefan compress_type = range->compress_type; 12721a419d85SLi Zefan } 1273f46b5a66SChristoph Hellwig 12740abd5b17SLiu Bo if (extent_thresh == 0) 12750abd5b17SLiu Bo extent_thresh = 256 * 1024; 1276f46b5a66SChristoph Hellwig 12774cb5300bSChris Mason /* 12784cb5300bSChris Mason * if we were not given a file, allocate a readahead 12794cb5300bSChris Mason * context 12804cb5300bSChris Mason */ 12814cb5300bSChris Mason if (!file) { 12824cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12834cb5300bSChris Mason if (!ra) 12844cb5300bSChris Mason return -ENOMEM; 12854cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12864cb5300bSChris Mason } else { 12874cb5300bSChris Mason ra = &file->f_ra; 12884cb5300bSChris Mason } 12894cb5300bSChris Mason 1290d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12914cb5300bSChris Mason GFP_NOFS); 12924cb5300bSChris Mason if (!pages) { 12934cb5300bSChris Mason ret = -ENOMEM; 12944cb5300bSChris Mason goto out_ra; 12954cb5300bSChris Mason } 12964cb5300bSChris Mason 12974cb5300bSChris Mason /* find the last page to defrag */ 12981e701a32SChris Mason if (range->start + range->len > range->start) { 1299151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13001e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13011e701a32SChris Mason } else { 1302151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13031e701a32SChris Mason } 13041e701a32SChris Mason 13054cb5300bSChris Mason if (newer_than) { 13064cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13074cb5300bSChris Mason &newer_off, 64 * 1024); 13084cb5300bSChris Mason if (!ret) { 13094cb5300bSChris Mason range->start = newer_off; 13104cb5300bSChris Mason /* 13114cb5300bSChris Mason * we always align our defrag to help keep 13124cb5300bSChris Mason * the extents in the file evenly spaced 13134cb5300bSChris Mason */ 13144cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13154cb5300bSChris Mason } else 13164cb5300bSChris Mason goto out_ra; 13174cb5300bSChris Mason } else { 13181e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13194cb5300bSChris Mason } 13204cb5300bSChris Mason if (!max_to_defrag) 13217ec31b54SLiu Bo max_to_defrag = last_index + 1; 13224cb5300bSChris Mason 13232a0f7f57SLi Zefan /* 13242a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13252a0f7f57SLi Zefan * written sequentially. 13262a0f7f57SLi Zefan */ 13272a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13282a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13292a0f7f57SLi Zefan 1330f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1331ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13324cb5300bSChris Mason /* 13334cb5300bSChris Mason * make sure we stop running if someone unmounts 13344cb5300bSChris Mason * the FS 13354cb5300bSChris Mason */ 13364cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13374cb5300bSChris Mason break; 13384cb5300bSChris Mason 1339210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1340efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1341210549ebSDavid Sterba ret = -EAGAIN; 1342210549ebSDavid Sterba break; 1343210549ebSDavid Sterba } 1344210549ebSDavid Sterba 134566c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13466c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1347a43a2111SAndrew Mahone &defrag_end, range->flags & 1348a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1349940100a4SChris Mason unsigned long next; 1350940100a4SChris Mason /* 1351940100a4SChris Mason * the should_defrag function tells us how much to skip 1352940100a4SChris Mason * bump our counter by the suggested amount 1353940100a4SChris Mason */ 1354ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1355940100a4SChris Mason i = max(i + 1, next); 1356940100a4SChris Mason continue; 1357940100a4SChris Mason } 1358008873eaSLi Zefan 1359008873eaSLi Zefan if (!newer_than) { 1360008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1361008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1362008873eaSLi Zefan cluster = min(cluster, max_cluster); 1363008873eaSLi Zefan } else { 1364008873eaSLi Zefan cluster = max_cluster; 1365008873eaSLi Zefan } 1366008873eaSLi Zefan 1367008873eaSLi Zefan if (i + cluster > ra_index) { 1368008873eaSLi Zefan ra_index = max(i, ra_index); 1369008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1370008873eaSLi Zefan cluster); 1371008873eaSLi Zefan ra_index += max_cluster; 1372008873eaSLi Zefan } 13734cb5300bSChris Mason 1374ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1375633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1376633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1377008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1378ecb8bea8SLiu Bo if (ret < 0) { 1379ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13804cb5300bSChris Mason goto out_ra; 1381ecb8bea8SLiu Bo } 13824cb5300bSChris Mason 13834cb5300bSChris Mason defrag_count += ret; 1384d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1385ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13864cb5300bSChris Mason 13874cb5300bSChris Mason if (newer_than) { 13884cb5300bSChris Mason if (newer_off == (u64)-1) 13894cb5300bSChris Mason break; 13904cb5300bSChris Mason 1391e1f041e1SLiu Bo if (ret > 0) 1392e1f041e1SLiu Bo i += ret; 1393e1f041e1SLiu Bo 13944cb5300bSChris Mason newer_off = max(newer_off + 1, 13954cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13964cb5300bSChris Mason 13974cb5300bSChris Mason ret = find_new_extents(root, inode, 13984cb5300bSChris Mason newer_than, &newer_off, 13994cb5300bSChris Mason 64 * 1024); 14004cb5300bSChris Mason if (!ret) { 14014cb5300bSChris Mason range->start = newer_off; 14024cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14034cb5300bSChris Mason } else { 14044cb5300bSChris Mason break; 1405940100a4SChris Mason } 14064cb5300bSChris Mason } else { 1407008873eaSLi Zefan if (ret > 0) { 1408cbcc8326SLi Zefan i += ret; 1409008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1410008873eaSLi Zefan } else { 1411940100a4SChris Mason i++; 1412008873eaSLi Zefan last_len = 0; 1413008873eaSLi Zefan } 1414f46b5a66SChristoph Hellwig } 14154cb5300bSChris Mason } 1416f46b5a66SChristoph Hellwig 1417dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14181e701a32SChris Mason filemap_flush(inode->i_mapping); 1419dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1420dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1421dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1422dec8ef90SFilipe Manana } 14231e701a32SChris Mason 14241e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14251e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14261e701a32SChris Mason * we have to make sure the IO is actually started and that 14271e701a32SChris Mason * ordered extents get created before we return 14281e701a32SChris Mason */ 14291e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14301e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14311e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14321e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14331e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14341e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14351e701a32SChris Mason } 14361e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14371e701a32SChris Mason } 14381e701a32SChris Mason 14391a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14402b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14411a419d85SLi Zefan } 14421a419d85SLi Zefan 144360ccf82fSDiego Calleja ret = defrag_count; 1444940100a4SChris Mason 14454cb5300bSChris Mason out_ra: 1446633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1447633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1448633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1449633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1450633085c7SFilipe David Borba Manana } 14514cb5300bSChris Mason if (!file) 14524cb5300bSChris Mason kfree(ra); 14534cb5300bSChris Mason kfree(pages); 1454940100a4SChris Mason return ret; 1455f46b5a66SChristoph Hellwig } 1456f46b5a66SChristoph Hellwig 1457198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 145876dda93cSYan, Zheng void __user *arg) 1459f46b5a66SChristoph Hellwig { 1460f46b5a66SChristoph Hellwig u64 new_size; 1461f46b5a66SChristoph Hellwig u64 old_size; 1462f46b5a66SChristoph Hellwig u64 devid = 1; 1463496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1464f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1465f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1466f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1467f46b5a66SChristoph Hellwig char *sizestr; 14689a40f122SGui Hecheng char *retptr; 1469f46b5a66SChristoph Hellwig char *devstr = NULL; 1470f46b5a66SChristoph Hellwig int ret = 0; 1471f46b5a66SChristoph Hellwig int mod = 0; 1472f46b5a66SChristoph Hellwig 1473e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1474e441d54dSChris Mason return -EPERM; 1475e441d54dSChris Mason 1476198605a8SMiao Xie ret = mnt_want_write_file(file); 1477198605a8SMiao Xie if (ret) 1478198605a8SMiao Xie return ret; 1479198605a8SMiao Xie 14805ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14815ac00addSStefan Behrens 1)) { 148297547676SMiao Xie mnt_drop_write_file(file); 1483e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1484c9e9f97bSIlya Dryomov } 1485c9e9f97bSIlya Dryomov 14865ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1487dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1488c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1489c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1490c9e9f97bSIlya Dryomov goto out; 1491c9e9f97bSIlya Dryomov } 14925516e595SMark Fasheh 14935516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1494f46b5a66SChristoph Hellwig 1495f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1496f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1497f46b5a66SChristoph Hellwig if (devstr) { 1498f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1499f46b5a66SChristoph Hellwig *devstr = '\0'; 1500f46b5a66SChristoph Hellwig devstr = vol_args->name; 150158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 150258dfae63SZhangZhen if (ret) 150358dfae63SZhangZhen goto out_free; 1504dfd79829SMiao Xie if (!devid) { 1505dfd79829SMiao Xie ret = -EINVAL; 1506dfd79829SMiao Xie goto out_free; 1507dfd79829SMiao Xie } 1508efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1509f46b5a66SChristoph Hellwig } 1510dba60f3fSMiao Xie 1511aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1512f46b5a66SChristoph Hellwig if (!device) { 1513efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1514c1c9ff7cSGeert Uytterhoeven devid); 1515dfd79829SMiao Xie ret = -ENODEV; 1516c9e9f97bSIlya Dryomov goto out_free; 1517f46b5a66SChristoph Hellwig } 1518dba60f3fSMiao Xie 1519dba60f3fSMiao Xie if (!device->writeable) { 1520efe120a0SFrank Holton btrfs_info(root->fs_info, 1521efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1522c1c9ff7cSGeert Uytterhoeven devid); 1523dfd79829SMiao Xie ret = -EPERM; 15244e42ae1bSLiu Bo goto out_free; 15254e42ae1bSLiu Bo } 15264e42ae1bSLiu Bo 1527f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1528f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1529f46b5a66SChristoph Hellwig else { 1530f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1531f46b5a66SChristoph Hellwig mod = -1; 1532f46b5a66SChristoph Hellwig sizestr++; 1533f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1534f46b5a66SChristoph Hellwig mod = 1; 1535f46b5a66SChristoph Hellwig sizestr++; 1536f46b5a66SChristoph Hellwig } 15379a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15389a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1539f46b5a66SChristoph Hellwig ret = -EINVAL; 1540c9e9f97bSIlya Dryomov goto out_free; 1541f46b5a66SChristoph Hellwig } 1542f46b5a66SChristoph Hellwig } 1543f46b5a66SChristoph Hellwig 154463a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1545dfd79829SMiao Xie ret = -EPERM; 154663a212abSStefan Behrens goto out_free; 154763a212abSStefan Behrens } 154863a212abSStefan Behrens 15497cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1550f46b5a66SChristoph Hellwig 1551f46b5a66SChristoph Hellwig if (mod < 0) { 1552f46b5a66SChristoph Hellwig if (new_size > old_size) { 1553f46b5a66SChristoph Hellwig ret = -EINVAL; 1554c9e9f97bSIlya Dryomov goto out_free; 1555f46b5a66SChristoph Hellwig } 1556f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1557f46b5a66SChristoph Hellwig } else if (mod > 0) { 1558eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1559902c68a4SGui Hecheng ret = -ERANGE; 1560eb8052e0SWenliang Fan goto out_free; 1561eb8052e0SWenliang Fan } 1562f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1563f46b5a66SChristoph Hellwig } 1564f46b5a66SChristoph Hellwig 1565f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1566f46b5a66SChristoph Hellwig ret = -EINVAL; 1567c9e9f97bSIlya Dryomov goto out_free; 1568f46b5a66SChristoph Hellwig } 1569f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1570f46b5a66SChristoph Hellwig ret = -EFBIG; 1571c9e9f97bSIlya Dryomov goto out_free; 1572f46b5a66SChristoph Hellwig } 1573f46b5a66SChristoph Hellwig 1574b8b93addSDavid Sterba new_size = div_u64(new_size, root->sectorsize); 1575f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1576f46b5a66SChristoph Hellwig 1577efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1578c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1579f46b5a66SChristoph Hellwig 1580f46b5a66SChristoph Hellwig if (new_size > old_size) { 1581a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 158298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 158398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1584c9e9f97bSIlya Dryomov goto out_free; 158598d5dc13STsutomu Itoh } 1586f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1587f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1588ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1589f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15900253f40eSjeff.liu } /* equal, nothing need to do */ 1591f46b5a66SChristoph Hellwig 1592c9e9f97bSIlya Dryomov out_free: 1593f46b5a66SChristoph Hellwig kfree(vol_args); 1594c9e9f97bSIlya Dryomov out: 1595c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15965ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 159718f39c41SIlya Dryomov mnt_drop_write_file(file); 1598f46b5a66SChristoph Hellwig return ret; 1599f46b5a66SChristoph Hellwig } 1600f46b5a66SChristoph Hellwig 160172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16026f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16036f72c7e2SArne Jansen u64 *transid, bool readonly, 16048696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1605f46b5a66SChristoph Hellwig { 1606f46b5a66SChristoph Hellwig int namelen; 16073de4586cSChris Mason int ret = 0; 1608f46b5a66SChristoph Hellwig 1609a874a63eSLiu Bo ret = mnt_want_write_file(file); 1610a874a63eSLiu Bo if (ret) 1611a874a63eSLiu Bo goto out; 1612a874a63eSLiu Bo 161372fd032eSSage Weil namelen = strlen(name); 161472fd032eSSage Weil if (strchr(name, '/')) { 1615f46b5a66SChristoph Hellwig ret = -EINVAL; 1616a874a63eSLiu Bo goto out_drop_write; 1617f46b5a66SChristoph Hellwig } 1618f46b5a66SChristoph Hellwig 161916780cabSChris Mason if (name[0] == '.' && 162016780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 162116780cabSChris Mason ret = -EEXIST; 1622a874a63eSLiu Bo goto out_drop_write; 162316780cabSChris Mason } 162416780cabSChris Mason 16253de4586cSChris Mason if (subvol) { 162672fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16276f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1628cb8e7090SChristoph Hellwig } else { 16292903ff01SAl Viro struct fd src = fdget(fd); 16303de4586cSChris Mason struct inode *src_inode; 16312903ff01SAl Viro if (!src.file) { 16323de4586cSChris Mason ret = -EINVAL; 1633a874a63eSLiu Bo goto out_drop_write; 16343de4586cSChris Mason } 16353de4586cSChris Mason 1636496ad9aaSAl Viro src_inode = file_inode(src.file); 1637496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1638efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1639efe120a0SFrank Holton "Snapshot src from another FS"); 164023ad5b17SKusanagi Kouichi ret = -EXDEV; 1641d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1642d0242061SDavid Sterba /* 1643d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1644d0242061SDavid Sterba * are limited to own subvolumes only 1645d0242061SDavid Sterba */ 1646d0242061SDavid Sterba ret = -EPERM; 1647ecd18815SAl Viro } else { 164872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 164972fd032eSSage Weil BTRFS_I(src_inode)->root, 16506f72c7e2SArne Jansen transid, readonly, inherit); 1651ecd18815SAl Viro } 16522903ff01SAl Viro fdput(src); 1653cb8e7090SChristoph Hellwig } 1654a874a63eSLiu Bo out_drop_write: 1655a874a63eSLiu Bo mnt_drop_write_file(file); 1656f46b5a66SChristoph Hellwig out: 165772fd032eSSage Weil return ret; 165872fd032eSSage Weil } 165972fd032eSSage Weil 166072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1661fa0d2b9bSLi Zefan void __user *arg, int subvol) 166272fd032eSSage Weil { 1663fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 166472fd032eSSage Weil int ret; 166572fd032eSSage Weil 1666fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1667fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1668fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1669fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1670fa0d2b9bSLi Zefan 1671fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1672b83cc969SLi Zefan vol_args->fd, subvol, 16736f72c7e2SArne Jansen NULL, false, NULL); 1674fa0d2b9bSLi Zefan 1675fa0d2b9bSLi Zefan kfree(vol_args); 1676fa0d2b9bSLi Zefan return ret; 1677fa0d2b9bSLi Zefan } 1678fa0d2b9bSLi Zefan 1679fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1680fa0d2b9bSLi Zefan void __user *arg, int subvol) 1681fa0d2b9bSLi Zefan { 1682fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1683fa0d2b9bSLi Zefan int ret; 1684fdfb1e4fSLi Zefan u64 transid = 0; 1685fdfb1e4fSLi Zefan u64 *ptr = NULL; 1686b83cc969SLi Zefan bool readonly = false; 16876f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 168872fd032eSSage Weil 1689fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1690fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1691fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1692fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1693fdfb1e4fSLi Zefan 1694b83cc969SLi Zefan if (vol_args->flags & 16956f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 16966f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1697b83cc969SLi Zefan ret = -EOPNOTSUPP; 1698c47ca32dSDan Carpenter goto free_args; 1699fdfb1e4fSLi Zefan } 1700fdfb1e4fSLi Zefan 1701fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1702fdfb1e4fSLi Zefan ptr = &transid; 1703b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1704b83cc969SLi Zefan readonly = true; 17056f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17066f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17076f72c7e2SArne Jansen ret = -EINVAL; 1708c47ca32dSDan Carpenter goto free_args; 17096f72c7e2SArne Jansen } 17106f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17116f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17126f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1713c47ca32dSDan Carpenter goto free_args; 17146f72c7e2SArne Jansen } 17156f72c7e2SArne Jansen } 171675eaa0e2SSage Weil 1717fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17186f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17198696c533SMiao Xie readonly, inherit); 1720c47ca32dSDan Carpenter if (ret) 1721c47ca32dSDan Carpenter goto free_inherit; 172275eaa0e2SSage Weil 1723c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1724fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1725c47ca32dSDan Carpenter transid), 1726c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 172775eaa0e2SSage Weil ret = -EFAULT; 1728c47ca32dSDan Carpenter 1729c47ca32dSDan Carpenter free_inherit: 17306f72c7e2SArne Jansen kfree(inherit); 1731c47ca32dSDan Carpenter free_args: 1732c47ca32dSDan Carpenter kfree(vol_args); 1733f46b5a66SChristoph Hellwig return ret; 1734f46b5a66SChristoph Hellwig } 1735f46b5a66SChristoph Hellwig 17360caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17370caa102dSLi Zefan void __user *arg) 17380caa102dSLi Zefan { 1739496ad9aaSAl Viro struct inode *inode = file_inode(file); 17400caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17410caa102dSLi Zefan int ret = 0; 17420caa102dSLi Zefan u64 flags = 0; 17430caa102dSLi Zefan 174433345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17450caa102dSLi Zefan return -EINVAL; 17460caa102dSLi Zefan 17470caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17480caa102dSLi Zefan if (btrfs_root_readonly(root)) 17490caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17500caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17510caa102dSLi Zefan 17520caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17530caa102dSLi Zefan ret = -EFAULT; 17540caa102dSLi Zefan 17550caa102dSLi Zefan return ret; 17560caa102dSLi Zefan } 17570caa102dSLi Zefan 17580caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17590caa102dSLi Zefan void __user *arg) 17600caa102dSLi Zefan { 1761496ad9aaSAl Viro struct inode *inode = file_inode(file); 17620caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17630caa102dSLi Zefan struct btrfs_trans_handle *trans; 17640caa102dSLi Zefan u64 root_flags; 17650caa102dSLi Zefan u64 flags; 17660caa102dSLi Zefan int ret = 0; 17670caa102dSLi Zefan 1768bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1769bd60ea0fSDavid Sterba return -EPERM; 1770bd60ea0fSDavid Sterba 1771b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1772b9ca0664SLiu Bo if (ret) 1773b9ca0664SLiu Bo goto out; 17740caa102dSLi Zefan 1775b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1776b9ca0664SLiu Bo ret = -EINVAL; 1777b9ca0664SLiu Bo goto out_drop_write; 1778b9ca0664SLiu Bo } 17790caa102dSLi Zefan 1780b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1781b9ca0664SLiu Bo ret = -EFAULT; 1782b9ca0664SLiu Bo goto out_drop_write; 1783b9ca0664SLiu Bo } 17840caa102dSLi Zefan 1785b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1786b9ca0664SLiu Bo ret = -EINVAL; 1787b9ca0664SLiu Bo goto out_drop_write; 1788b9ca0664SLiu Bo } 17890caa102dSLi Zefan 1790b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1791b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1792b9ca0664SLiu Bo goto out_drop_write; 1793b9ca0664SLiu Bo } 17940caa102dSLi Zefan 17950caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17960caa102dSLi Zefan 17970caa102dSLi Zefan /* nothing to do */ 17980caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1799b9ca0664SLiu Bo goto out_drop_sem; 18000caa102dSLi Zefan 18010caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18022c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18030caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18040caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18052c686537SDavid Sterba } else { 18062c686537SDavid Sterba /* 18072c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18082c686537SDavid Sterba * send 18092c686537SDavid Sterba */ 18102c686537SDavid Sterba spin_lock(&root->root_item_lock); 18112c686537SDavid Sterba if (root->send_in_progress == 0) { 18120caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18130caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18142c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18152c686537SDavid Sterba } else { 18162c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18172c686537SDavid Sterba btrfs_warn(root->fs_info, 18182c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18192c686537SDavid Sterba root->root_key.objectid); 18202c686537SDavid Sterba ret = -EPERM; 18212c686537SDavid Sterba goto out_drop_sem; 18222c686537SDavid Sterba } 18232c686537SDavid Sterba } 18240caa102dSLi Zefan 18250caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18260caa102dSLi Zefan if (IS_ERR(trans)) { 18270caa102dSLi Zefan ret = PTR_ERR(trans); 18280caa102dSLi Zefan goto out_reset; 18290caa102dSLi Zefan } 18300caa102dSLi Zefan 1831b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18320caa102dSLi Zefan &root->root_key, &root->root_item); 18330caa102dSLi Zefan 18340caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18350caa102dSLi Zefan out_reset: 18360caa102dSLi Zefan if (ret) 18370caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1838b9ca0664SLiu Bo out_drop_sem: 18390caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1840b9ca0664SLiu Bo out_drop_write: 1841b9ca0664SLiu Bo mnt_drop_write_file(file); 1842b9ca0664SLiu Bo out: 18430caa102dSLi Zefan return ret; 18440caa102dSLi Zefan } 18450caa102dSLi Zefan 184676dda93cSYan, Zheng /* 184776dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 184876dda93cSYan, Zheng */ 184976dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 185076dda93cSYan, Zheng { 185176dda93cSYan, Zheng struct btrfs_path *path; 1852175a2b87SJosef Bacik struct btrfs_dir_item *di; 185376dda93cSYan, Zheng struct btrfs_key key; 1854175a2b87SJosef Bacik u64 dir_id; 185576dda93cSYan, Zheng int ret; 185676dda93cSYan, Zheng 185776dda93cSYan, Zheng path = btrfs_alloc_path(); 185876dda93cSYan, Zheng if (!path) 185976dda93cSYan, Zheng return -ENOMEM; 186076dda93cSYan, Zheng 1861175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1862175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1863175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1864175a2b87SJosef Bacik dir_id, "default", 7, 0); 1865175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1866175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1867175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 186872de6b53SGuangyu Sun ret = -EPERM; 186972de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 187072de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1871175a2b87SJosef Bacik goto out; 1872175a2b87SJosef Bacik } 1873175a2b87SJosef Bacik btrfs_release_path(path); 1874175a2b87SJosef Bacik } 1875175a2b87SJosef Bacik 187676dda93cSYan, Zheng key.objectid = root->root_key.objectid; 187776dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 187876dda93cSYan, Zheng key.offset = (u64)-1; 187976dda93cSYan, Zheng 188076dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 188176dda93cSYan, Zheng &key, path, 0, 0); 188276dda93cSYan, Zheng if (ret < 0) 188376dda93cSYan, Zheng goto out; 188476dda93cSYan, Zheng BUG_ON(ret == 0); 188576dda93cSYan, Zheng 188676dda93cSYan, Zheng ret = 0; 188776dda93cSYan, Zheng if (path->slots[0] > 0) { 188876dda93cSYan, Zheng path->slots[0]--; 188976dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 189076dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 189176dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 189276dda93cSYan, Zheng ret = -ENOTEMPTY; 189376dda93cSYan, Zheng } 189476dda93cSYan, Zheng out: 189576dda93cSYan, Zheng btrfs_free_path(path); 189676dda93cSYan, Zheng return ret; 189776dda93cSYan, Zheng } 189876dda93cSYan, Zheng 1899ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1900ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1901ac8e9819SChris Mason { 1902abc6e134SChris Mason struct btrfs_key test; 1903abc6e134SChris Mason int ret; 1904abc6e134SChris Mason 1905abc6e134SChris Mason test.objectid = sk->min_objectid; 1906abc6e134SChris Mason test.type = sk->min_type; 1907abc6e134SChris Mason test.offset = sk->min_offset; 1908abc6e134SChris Mason 1909abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1910abc6e134SChris Mason if (ret < 0) 1911ac8e9819SChris Mason return 0; 1912abc6e134SChris Mason 1913abc6e134SChris Mason test.objectid = sk->max_objectid; 1914abc6e134SChris Mason test.type = sk->max_type; 1915abc6e134SChris Mason test.offset = sk->max_offset; 1916abc6e134SChris Mason 1917abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1918abc6e134SChris Mason if (ret > 0) 1919ac8e9819SChris Mason return 0; 1920ac8e9819SChris Mason return 1; 1921ac8e9819SChris Mason } 1922ac8e9819SChris Mason 1923ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1924ac8e9819SChris Mason struct btrfs_path *path, 1925ac8e9819SChris Mason struct btrfs_key *key, 1926ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19279b6e817dSGerhard Heift size_t *buf_size, 1928ba346b35SGerhard Heift char __user *ubuf, 1929ac8e9819SChris Mason unsigned long *sk_offset, 1930ac8e9819SChris Mason int *num_found) 1931ac8e9819SChris Mason { 1932ac8e9819SChris Mason u64 found_transid; 1933ac8e9819SChris Mason struct extent_buffer *leaf; 1934ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1935ac8e9819SChris Mason unsigned long item_off; 1936ac8e9819SChris Mason unsigned long item_len; 1937ac8e9819SChris Mason int nritems; 1938ac8e9819SChris Mason int i; 1939ac8e9819SChris Mason int slot; 1940ac8e9819SChris Mason int ret = 0; 1941ac8e9819SChris Mason 1942ac8e9819SChris Mason leaf = path->nodes[0]; 1943ac8e9819SChris Mason slot = path->slots[0]; 1944ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1945ac8e9819SChris Mason 1946ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1947ac8e9819SChris Mason i = nritems; 1948ac8e9819SChris Mason goto advance_key; 1949ac8e9819SChris Mason } 1950ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1951ac8e9819SChris Mason 1952ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1953ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1954ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1955ac8e9819SChris Mason 195603b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 195703b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 195803b71c6cSGabriel de Perthuis continue; 195903b71c6cSGabriel de Perthuis 19609b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19618f5f6178SGerhard Heift if (*num_found) { 1962ac8e9819SChris Mason ret = 1; 19638f5f6178SGerhard Heift goto out; 19648f5f6178SGerhard Heift } 19658f5f6178SGerhard Heift 19668f5f6178SGerhard Heift /* 19678f5f6178SGerhard Heift * return one empty item back for v1, which does not 19688f5f6178SGerhard Heift * handle -EOVERFLOW 19698f5f6178SGerhard Heift */ 19708f5f6178SGerhard Heift 19719b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1972ac8e9819SChris Mason item_len = 0; 19738f5f6178SGerhard Heift ret = -EOVERFLOW; 19748f5f6178SGerhard Heift } 1975ac8e9819SChris Mason 19769b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1977ac8e9819SChris Mason ret = 1; 197825c9bc2eSGerhard Heift goto out; 1979ac8e9819SChris Mason } 1980ac8e9819SChris Mason 1981ac8e9819SChris Mason sh.objectid = key->objectid; 1982ac8e9819SChris Mason sh.offset = key->offset; 1983ac8e9819SChris Mason sh.type = key->type; 1984ac8e9819SChris Mason sh.len = item_len; 1985ac8e9819SChris Mason sh.transid = found_transid; 1986ac8e9819SChris Mason 1987ac8e9819SChris Mason /* copy search result header */ 1988ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 1989ba346b35SGerhard Heift ret = -EFAULT; 1990ba346b35SGerhard Heift goto out; 1991ba346b35SGerhard Heift } 1992ba346b35SGerhard Heift 1993ac8e9819SChris Mason *sk_offset += sizeof(sh); 1994ac8e9819SChris Mason 1995ac8e9819SChris Mason if (item_len) { 1996ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1997ac8e9819SChris Mason /* copy the item */ 1998ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 1999ba346b35SGerhard Heift item_off, item_len)) { 2000ba346b35SGerhard Heift ret = -EFAULT; 2001ba346b35SGerhard Heift goto out; 2002ba346b35SGerhard Heift } 2003ba346b35SGerhard Heift 2004ac8e9819SChris Mason *sk_offset += item_len; 2005ac8e9819SChris Mason } 2006e2156867SHugo Mills (*num_found)++; 2007ac8e9819SChris Mason 20088f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20098f5f6178SGerhard Heift goto out; 20108f5f6178SGerhard Heift 201125c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 201225c9bc2eSGerhard Heift ret = 1; 201325c9bc2eSGerhard Heift goto out; 201425c9bc2eSGerhard Heift } 2015ac8e9819SChris Mason } 2016ac8e9819SChris Mason advance_key: 2017ac8e9819SChris Mason ret = 0; 2018abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 2019abc6e134SChris Mason key->offset++; 2020abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 2021abc6e134SChris Mason key->offset = 0; 2022abc6e134SChris Mason key->type++; 2023abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 2024abc6e134SChris Mason key->offset = 0; 2025abc6e134SChris Mason key->type = 0; 2026abc6e134SChris Mason key->objectid++; 2027abc6e134SChris Mason } else 2028abc6e134SChris Mason ret = 1; 202925c9bc2eSGerhard Heift out: 2030ba346b35SGerhard Heift /* 2031ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2032ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2033ba346b35SGerhard Heift * * all items were found 2034ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2035ba346b35SGerhard Heift * leaf 2036ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2037ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2038ba346b35SGerhard Heift */ 2039ac8e9819SChris Mason return ret; 2040ac8e9819SChris Mason } 2041ac8e9819SChris Mason 2042ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 204312544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20449b6e817dSGerhard Heift size_t *buf_size, 2045ba346b35SGerhard Heift char __user *ubuf) 2046ac8e9819SChris Mason { 2047ac8e9819SChris Mason struct btrfs_root *root; 2048ac8e9819SChris Mason struct btrfs_key key; 2049ac8e9819SChris Mason struct btrfs_path *path; 2050ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2051ac8e9819SChris Mason int ret; 2052ac8e9819SChris Mason int num_found = 0; 2053ac8e9819SChris Mason unsigned long sk_offset = 0; 2054ac8e9819SChris Mason 20559b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20569b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 205712544442SGerhard Heift return -EOVERFLOW; 20589b6e817dSGerhard Heift } 205912544442SGerhard Heift 2060ac8e9819SChris Mason path = btrfs_alloc_path(); 2061ac8e9819SChris Mason if (!path) 2062ac8e9819SChris Mason return -ENOMEM; 2063ac8e9819SChris Mason 2064ac8e9819SChris Mason if (sk->tree_id == 0) { 2065ac8e9819SChris Mason /* search the root of the inode that was passed */ 2066ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2067ac8e9819SChris Mason } else { 2068ac8e9819SChris Mason key.objectid = sk->tree_id; 2069ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2070ac8e9819SChris Mason key.offset = (u64)-1; 2071ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2072ac8e9819SChris Mason if (IS_ERR(root)) { 2073efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 2074ac8e9819SChris Mason sk->tree_id); 2075ac8e9819SChris Mason btrfs_free_path(path); 2076ac8e9819SChris Mason return -ENOENT; 2077ac8e9819SChris Mason } 2078ac8e9819SChris Mason } 2079ac8e9819SChris Mason 2080ac8e9819SChris Mason key.objectid = sk->min_objectid; 2081ac8e9819SChris Mason key.type = sk->min_type; 2082ac8e9819SChris Mason key.offset = sk->min_offset; 2083ac8e9819SChris Mason 2084ac8e9819SChris Mason while (1) { 20856174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2086ac8e9819SChris Mason if (ret != 0) { 2087ac8e9819SChris Mason if (ret > 0) 2088ac8e9819SChris Mason ret = 0; 2089ac8e9819SChris Mason goto err; 2090ac8e9819SChris Mason } 2091ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2092ac8e9819SChris Mason &sk_offset, &num_found); 2093b3b4aa74SDavid Sterba btrfs_release_path(path); 209425c9bc2eSGerhard Heift if (ret) 2095ac8e9819SChris Mason break; 2096ac8e9819SChris Mason 2097ac8e9819SChris Mason } 20988f5f6178SGerhard Heift if (ret > 0) 2099ac8e9819SChris Mason ret = 0; 2100ac8e9819SChris Mason err: 2101ac8e9819SChris Mason sk->nr_items = num_found; 2102ac8e9819SChris Mason btrfs_free_path(path); 2103ac8e9819SChris Mason return ret; 2104ac8e9819SChris Mason } 2105ac8e9819SChris Mason 2106ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2107ac8e9819SChris Mason void __user *argp) 2108ac8e9819SChris Mason { 2109ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2110ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2111ac8e9819SChris Mason struct inode *inode; 2112ac8e9819SChris Mason int ret; 21139b6e817dSGerhard Heift size_t buf_size; 2114ac8e9819SChris Mason 2115ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2116ac8e9819SChris Mason return -EPERM; 2117ac8e9819SChris Mason 2118ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2119ac8e9819SChris Mason 2120ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2121ba346b35SGerhard Heift return -EFAULT; 2122ba346b35SGerhard Heift 2123ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2124ac8e9819SChris Mason 2125496ad9aaSAl Viro inode = file_inode(file); 2126ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21278f5f6178SGerhard Heift 21288f5f6178SGerhard Heift /* 21298f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21308f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21318f5f6178SGerhard Heift */ 21328f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21338f5f6178SGerhard Heift ret = 0; 21348f5f6178SGerhard Heift 2135ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2136ac8e9819SChris Mason ret = -EFAULT; 2137ac8e9819SChris Mason return ret; 2138ac8e9819SChris Mason } 2139ac8e9819SChris Mason 2140cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2141cc68a8a5SGerhard Heift void __user *argp) 2142cc68a8a5SGerhard Heift { 2143cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2144cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2145cc68a8a5SGerhard Heift struct inode *inode; 2146cc68a8a5SGerhard Heift int ret; 2147cc68a8a5SGerhard Heift size_t buf_size; 2148cc68a8a5SGerhard Heift const size_t buf_limit = 16 * 1024 * 1024; 2149cc68a8a5SGerhard Heift 2150cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2151cc68a8a5SGerhard Heift return -EPERM; 2152cc68a8a5SGerhard Heift 2153cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2154cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2155cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2156cc68a8a5SGerhard Heift return -EFAULT; 2157cc68a8a5SGerhard Heift 2158cc68a8a5SGerhard Heift buf_size = args.buf_size; 2159cc68a8a5SGerhard Heift 2160cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2161cc68a8a5SGerhard Heift return -EOVERFLOW; 2162cc68a8a5SGerhard Heift 2163cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2164cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2165cc68a8a5SGerhard Heift buf_size = buf_limit; 2166cc68a8a5SGerhard Heift 2167cc68a8a5SGerhard Heift inode = file_inode(file); 2168cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2169cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2170cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2171cc68a8a5SGerhard Heift ret = -EFAULT; 2172cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2173cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2174cc68a8a5SGerhard Heift ret = -EFAULT; 2175cc68a8a5SGerhard Heift 217676dda93cSYan, Zheng return ret; 217776dda93cSYan, Zheng } 217876dda93cSYan, Zheng 217998d377a0STARUISI Hiroaki /* 2180ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2181ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 218298d377a0STARUISI Hiroaki */ 218398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 218498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 218598d377a0STARUISI Hiroaki { 218698d377a0STARUISI Hiroaki struct btrfs_root *root; 218798d377a0STARUISI Hiroaki struct btrfs_key key; 2188ac8e9819SChris Mason char *ptr; 218998d377a0STARUISI Hiroaki int ret = -1; 219098d377a0STARUISI Hiroaki int slot; 219198d377a0STARUISI Hiroaki int len; 219298d377a0STARUISI Hiroaki int total_len = 0; 219398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 219498d377a0STARUISI Hiroaki struct extent_buffer *l; 219598d377a0STARUISI Hiroaki struct btrfs_path *path; 219698d377a0STARUISI Hiroaki 219798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 219898d377a0STARUISI Hiroaki name[0]='\0'; 219998d377a0STARUISI Hiroaki return 0; 220098d377a0STARUISI Hiroaki } 220198d377a0STARUISI Hiroaki 220298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 220398d377a0STARUISI Hiroaki if (!path) 220498d377a0STARUISI Hiroaki return -ENOMEM; 220598d377a0STARUISI Hiroaki 2206ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 220798d377a0STARUISI Hiroaki 220898d377a0STARUISI Hiroaki key.objectid = tree_id; 220998d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 221098d377a0STARUISI Hiroaki key.offset = (u64)-1; 221198d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 221298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2213efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 22148ad6fcabSChris Mason ret = -ENOENT; 22158ad6fcabSChris Mason goto out; 221698d377a0STARUISI Hiroaki } 221798d377a0STARUISI Hiroaki 221898d377a0STARUISI Hiroaki key.objectid = dirid; 221998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22208ad6fcabSChris Mason key.offset = (u64)-1; 222198d377a0STARUISI Hiroaki 222298d377a0STARUISI Hiroaki while (1) { 222398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 222498d377a0STARUISI Hiroaki if (ret < 0) 222598d377a0STARUISI Hiroaki goto out; 222618674c6cSFilipe David Borba Manana else if (ret > 0) { 222718674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 222818674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 222918674c6cSFilipe David Borba Manana if (ret < 0) 223018674c6cSFilipe David Borba Manana goto out; 223118674c6cSFilipe David Borba Manana else if (ret > 0) { 2232ac8e9819SChris Mason ret = -ENOENT; 223398d377a0STARUISI Hiroaki goto out; 2234ac8e9819SChris Mason } 223518674c6cSFilipe David Borba Manana } 223618674c6cSFilipe David Borba Manana 223718674c6cSFilipe David Borba Manana l = path->nodes[0]; 223818674c6cSFilipe David Borba Manana slot = path->slots[0]; 223918674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 224098d377a0STARUISI Hiroaki 224198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 224298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 224398d377a0STARUISI Hiroaki ptr -= len + 1; 224498d377a0STARUISI Hiroaki total_len += len + 1; 2245a696cf35SFilipe David Borba Manana if (ptr < name) { 2246a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 224798d377a0STARUISI Hiroaki goto out; 2248a696cf35SFilipe David Borba Manana } 224998d377a0STARUISI Hiroaki 225098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 225198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 225298d377a0STARUISI Hiroaki 225398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 225498d377a0STARUISI Hiroaki break; 225598d377a0STARUISI Hiroaki 2256b3b4aa74SDavid Sterba btrfs_release_path(path); 225798d377a0STARUISI Hiroaki key.objectid = key.offset; 22588ad6fcabSChris Mason key.offset = (u64)-1; 225998d377a0STARUISI Hiroaki dirid = key.objectid; 226098d377a0STARUISI Hiroaki } 226177906a50SLi Zefan memmove(name, ptr, total_len); 226298d377a0STARUISI Hiroaki name[total_len] = '\0'; 226398d377a0STARUISI Hiroaki ret = 0; 226498d377a0STARUISI Hiroaki out: 226598d377a0STARUISI Hiroaki btrfs_free_path(path); 2266ac8e9819SChris Mason return ret; 2267ac8e9819SChris Mason } 2268ac8e9819SChris Mason 2269ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2270ac8e9819SChris Mason void __user *argp) 2271ac8e9819SChris Mason { 2272ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2273ac8e9819SChris Mason struct inode *inode; 2274ac8e9819SChris Mason int ret; 2275ac8e9819SChris Mason 2276ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2277ac8e9819SChris Mason return -EPERM; 2278ac8e9819SChris Mason 22792354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 22802354d08fSJulia Lawall if (IS_ERR(args)) 22812354d08fSJulia Lawall return PTR_ERR(args); 2282c2b96929SDan Carpenter 2283496ad9aaSAl Viro inode = file_inode(file); 2284ac8e9819SChris Mason 22851b53ac4dSChris Mason if (args->treeid == 0) 22861b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 22871b53ac4dSChris Mason 2288ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2289ac8e9819SChris Mason args->treeid, args->objectid, 2290ac8e9819SChris Mason args->name); 2291ac8e9819SChris Mason 2292ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2293ac8e9819SChris Mason ret = -EFAULT; 2294ac8e9819SChris Mason 2295ac8e9819SChris Mason kfree(args); 229698d377a0STARUISI Hiroaki return ret; 229798d377a0STARUISI Hiroaki } 229898d377a0STARUISI Hiroaki 229976dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 230076dda93cSYan, Zheng void __user *arg) 230176dda93cSYan, Zheng { 230254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 230376dda93cSYan, Zheng struct dentry *dentry; 230476dda93cSYan, Zheng struct inode *dir = parent->d_inode; 230576dda93cSYan, Zheng struct inode *inode; 230676dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 230776dda93cSYan, Zheng struct btrfs_root *dest = NULL; 230876dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 230976dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2310c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2311521e0546SDavid Sterba u64 root_flags; 2312c58aaad2SMiao Xie u64 qgroup_reserved; 231376dda93cSYan, Zheng int namelen; 231476dda93cSYan, Zheng int ret; 231576dda93cSYan, Zheng int err = 0; 231676dda93cSYan, Zheng 231776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 231876dda93cSYan, Zheng if (IS_ERR(vol_args)) 231976dda93cSYan, Zheng return PTR_ERR(vol_args); 232076dda93cSYan, Zheng 232176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 232276dda93cSYan, Zheng namelen = strlen(vol_args->name); 232376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 232476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 232576dda93cSYan, Zheng err = -EINVAL; 232676dda93cSYan, Zheng goto out; 232776dda93cSYan, Zheng } 232876dda93cSYan, Zheng 2329a561be71SAl Viro err = mnt_want_write_file(file); 233076dda93cSYan, Zheng if (err) 233176dda93cSYan, Zheng goto out; 233276dda93cSYan, Zheng 2333521e0546SDavid Sterba 23345c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23355c50c9b8SDavid Sterba if (err == -EINTR) 2336e43f998eSDavid Sterba goto out_drop_write; 233776dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 233876dda93cSYan, Zheng if (IS_ERR(dentry)) { 233976dda93cSYan, Zheng err = PTR_ERR(dentry); 234076dda93cSYan, Zheng goto out_unlock_dir; 234176dda93cSYan, Zheng } 234276dda93cSYan, Zheng 234376dda93cSYan, Zheng if (!dentry->d_inode) { 234476dda93cSYan, Zheng err = -ENOENT; 234576dda93cSYan, Zheng goto out_dput; 234676dda93cSYan, Zheng } 234776dda93cSYan, Zheng 234876dda93cSYan, Zheng inode = dentry->d_inode; 23494260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23504260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23514260f7c7SSage Weil /* 23524260f7c7SSage Weil * Regular user. Only allow this with a special mount 23534260f7c7SSage Weil * option, when the user has write+exec access to the 23544260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23554260f7c7SSage Weil * allowed. 23564260f7c7SSage Weil * 23574260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23584260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23594260f7c7SSage Weil * otherwise be able to delete. 23604260f7c7SSage Weil * 23614260f7c7SSage Weil * Users who want to delete empty subvols should try 23624260f7c7SSage Weil * rmdir(2). 23634260f7c7SSage Weil */ 23644260f7c7SSage Weil err = -EPERM; 23654260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 23664260f7c7SSage Weil goto out_dput; 23674260f7c7SSage Weil 23684260f7c7SSage Weil /* 23694260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 23704260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 23714260f7c7SSage Weil * must be called on the dentry referencing the root 23724260f7c7SSage Weil * of the subvol, not a random directory contained 23734260f7c7SSage Weil * within it. 23744260f7c7SSage Weil */ 23754260f7c7SSage Weil err = -EINVAL; 23764260f7c7SSage Weil if (root == dest) 23774260f7c7SSage Weil goto out_dput; 23784260f7c7SSage Weil 23794260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 23804260f7c7SSage Weil if (err) 23814260f7c7SSage Weil goto out_dput; 23825c39da5bSMiao Xie } 23834260f7c7SSage Weil 23845c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 23854260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 23864260f7c7SSage Weil if (err) 23874260f7c7SSage Weil goto out_dput; 23884260f7c7SSage Weil 238933345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 239076dda93cSYan, Zheng err = -EINVAL; 239176dda93cSYan, Zheng goto out_dput; 239276dda93cSYan, Zheng } 239376dda93cSYan, Zheng 239476dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 2395521e0546SDavid Sterba 2396521e0546SDavid Sterba /* 2397521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2398521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2399521e0546SDavid Sterba * again is not run concurrently. 2400521e0546SDavid Sterba */ 2401521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2402c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2403c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2404c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2405521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2406521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2407521e0546SDavid Sterba } else { 2408521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2409521e0546SDavid Sterba btrfs_warn(root->fs_info, 2410521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2411c55bfa67SFilipe Manana dest->root_key.objectid); 2412521e0546SDavid Sterba err = -EPERM; 2413521e0546SDavid Sterba goto out_dput; 2414521e0546SDavid Sterba } 2415521e0546SDavid Sterba 24165542aa2fSEric W. Biederman d_invalidate(dentry); 241776dda93cSYan, Zheng 241876dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 241976dda93cSYan, Zheng 242076dda93cSYan, Zheng err = may_destroy_subvol(dest); 242176dda93cSYan, Zheng if (err) 242276dda93cSYan, Zheng goto out_up_write; 242376dda93cSYan, Zheng 2424c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2425c58aaad2SMiao Xie /* 2426c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2427c58aaad2SMiao Xie * ref/backref. 2428c58aaad2SMiao Xie */ 2429c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2430ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2431c58aaad2SMiao Xie if (err) 2432c58aaad2SMiao Xie goto out_up_write; 2433c58aaad2SMiao Xie 2434a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2435a22285a6SYan, Zheng if (IS_ERR(trans)) { 2436a22285a6SYan, Zheng err = PTR_ERR(trans); 2437c58aaad2SMiao Xie goto out_release; 2438a22285a6SYan, Zheng } 2439c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2440c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2441a22285a6SYan, Zheng 244276dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 244376dda93cSYan, Zheng dest->root_key.objectid, 244476dda93cSYan, Zheng dentry->d_name.name, 244576dda93cSYan, Zheng dentry->d_name.len); 244679787eaaSJeff Mahoney if (ret) { 244779787eaaSJeff Mahoney err = ret; 244879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 244979787eaaSJeff Mahoney goto out_end_trans; 245079787eaaSJeff Mahoney } 245176dda93cSYan, Zheng 245276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 245376dda93cSYan, Zheng 245476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 245576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 245676dda93cSYan, Zheng dest->root_item.drop_level = 0; 245776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 245876dda93cSYan, Zheng 245927cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 246076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 246176dda93cSYan, Zheng root->fs_info->tree_root, 246276dda93cSYan, Zheng dest->root_key.objectid); 246379787eaaSJeff Mahoney if (ret) { 246479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 246579787eaaSJeff Mahoney err = ret; 246679787eaaSJeff Mahoney goto out_end_trans; 2467d68fc57bSYan, Zheng } 246879787eaaSJeff Mahoney } 2469dd5f9615SStefan Behrens 2470dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2471dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2472dd5f9615SStefan Behrens dest->root_key.objectid); 2473dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2474dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2475dd5f9615SStefan Behrens err = ret; 2476dd5f9615SStefan Behrens goto out_end_trans; 2477dd5f9615SStefan Behrens } 2478dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2479dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2480dd5f9615SStefan Behrens dest->root_item.received_uuid, 2481dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2482dd5f9615SStefan Behrens dest->root_key.objectid); 2483dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2484dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2485dd5f9615SStefan Behrens err = ret; 2486dd5f9615SStefan Behrens goto out_end_trans; 2487dd5f9615SStefan Behrens } 2488dd5f9615SStefan Behrens } 2489dd5f9615SStefan Behrens 249079787eaaSJeff Mahoney out_end_trans: 2491c58aaad2SMiao Xie trans->block_rsv = NULL; 2492c58aaad2SMiao Xie trans->bytes_reserved = 0; 2493531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 249479787eaaSJeff Mahoney if (ret && !err) 249579787eaaSJeff Mahoney err = ret; 249676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2497c58aaad2SMiao Xie out_release: 2498c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 249976dda93cSYan, Zheng out_up_write: 250076dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 2501521e0546SDavid Sterba if (err) { 2502521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2503c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2504c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2505521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2506521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2507521e0546SDavid Sterba } 250876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 250976dda93cSYan, Zheng if (!err) { 2510efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 251176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 251276dda93cSYan, Zheng d_delete(dentry); 251361155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2514fa6ac876SLiu Bo 2515fa6ac876SLiu Bo /* the last ref */ 251657cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 251757cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 251857cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2519fa6ac876SLiu Bo } 252076dda93cSYan, Zheng } 252176dda93cSYan, Zheng out_dput: 252276dda93cSYan, Zheng dput(dentry); 252376dda93cSYan, Zheng out_unlock_dir: 252476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2525e43f998eSDavid Sterba out_drop_write: 25262a79f17eSAl Viro mnt_drop_write_file(file); 252776dda93cSYan, Zheng out: 252876dda93cSYan, Zheng kfree(vol_args); 252976dda93cSYan, Zheng return err; 253076dda93cSYan, Zheng } 253176dda93cSYan, Zheng 25321e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2533f46b5a66SChristoph Hellwig { 2534496ad9aaSAl Viro struct inode *inode = file_inode(file); 2535f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25361e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2537c146afadSYan Zheng int ret; 2538c146afadSYan Zheng 253925122d15SIlya Dryomov ret = mnt_want_write_file(file); 254025122d15SIlya Dryomov if (ret) 254125122d15SIlya Dryomov return ret; 2542b83cc969SLi Zefan 254325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 254425122d15SIlya Dryomov ret = -EROFS; 254525122d15SIlya Dryomov goto out; 25465ac00addSStefan Behrens } 2547f46b5a66SChristoph Hellwig 2548f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2549f46b5a66SChristoph Hellwig case S_IFDIR: 2550e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2551e441d54dSChris Mason ret = -EPERM; 2552e441d54dSChris Mason goto out; 2553e441d54dSChris Mason } 2554de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25558929ecfaSYan, Zheng if (ret) 25568929ecfaSYan, Zheng goto out; 2557de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2558f46b5a66SChristoph Hellwig break; 2559f46b5a66SChristoph Hellwig case S_IFREG: 2560e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2561e441d54dSChris Mason ret = -EINVAL; 2562e441d54dSChris Mason goto out; 2563e441d54dSChris Mason } 25641e701a32SChris Mason 25651e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 25661e701a32SChris Mason if (!range) { 25671e701a32SChris Mason ret = -ENOMEM; 25681e701a32SChris Mason goto out; 25691e701a32SChris Mason } 25701e701a32SChris Mason 25711e701a32SChris Mason if (argp) { 25721e701a32SChris Mason if (copy_from_user(range, argp, 25731e701a32SChris Mason sizeof(*range))) { 25741e701a32SChris Mason ret = -EFAULT; 25751e701a32SChris Mason kfree(range); 2576683be16eSDan Carpenter goto out; 25771e701a32SChris Mason } 25781e701a32SChris Mason /* compression requires us to start the IO */ 25791e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 25801e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 25811e701a32SChris Mason range->extent_thresh = (u32)-1; 25821e701a32SChris Mason } 25831e701a32SChris Mason } else { 25841e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 25851e701a32SChris Mason range->len = (u64)-1; 25861e701a32SChris Mason } 2587496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 25884cb5300bSChris Mason range, 0, 0); 25894cb5300bSChris Mason if (ret > 0) 25904cb5300bSChris Mason ret = 0; 25911e701a32SChris Mason kfree(range); 2592f46b5a66SChristoph Hellwig break; 25938929ecfaSYan, Zheng default: 25948929ecfaSYan, Zheng ret = -EINVAL; 2595f46b5a66SChristoph Hellwig } 2596e441d54dSChris Mason out: 259725122d15SIlya Dryomov mnt_drop_write_file(file); 2598e441d54dSChris Mason return ret; 2599f46b5a66SChristoph Hellwig } 2600f46b5a66SChristoph Hellwig 2601b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2602f46b5a66SChristoph Hellwig { 2603f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2604f46b5a66SChristoph Hellwig int ret; 2605f46b5a66SChristoph Hellwig 2606e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2607e441d54dSChris Mason return -EPERM; 2608e441d54dSChris Mason 26095ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26105ac00addSStefan Behrens 1)) { 2611e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2612c9e9f97bSIlya Dryomov } 2613c9e9f97bSIlya Dryomov 26145ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2615dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2616c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2617c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2618c9e9f97bSIlya Dryomov goto out; 2619c9e9f97bSIlya Dryomov } 2620f46b5a66SChristoph Hellwig 26215516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2622f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2623f46b5a66SChristoph Hellwig 262443d20761SAnand Jain if (!ret) 262543d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 262643d20761SAnand Jain 2627f46b5a66SChristoph Hellwig kfree(vol_args); 2628c9e9f97bSIlya Dryomov out: 2629c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26305ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2631f46b5a66SChristoph Hellwig return ret; 2632f46b5a66SChristoph Hellwig } 2633f46b5a66SChristoph Hellwig 2634da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2635f46b5a66SChristoph Hellwig { 2636496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2637f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2638f46b5a66SChristoph Hellwig int ret; 2639f46b5a66SChristoph Hellwig 2640e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2641e441d54dSChris Mason return -EPERM; 2642e441d54dSChris Mason 2643da24927bSMiao Xie ret = mnt_want_write_file(file); 2644da24927bSMiao Xie if (ret) 2645da24927bSMiao Xie return ret; 2646c146afadSYan Zheng 2647dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2648c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2649c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2650c47ca32dSDan Carpenter goto err_drop; 2651c9e9f97bSIlya Dryomov } 2652f46b5a66SChristoph Hellwig 26535516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2654f46b5a66SChristoph Hellwig 2655183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2656183860f6SAnand Jain 1)) { 2657183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2658183860f6SAnand Jain goto out; 2659183860f6SAnand Jain } 2660183860f6SAnand Jain 2661183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2662183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2663c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26645ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2665183860f6SAnand Jain 2666ec95d491SAnand Jain if (!ret) 2667ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2668ec95d491SAnand Jain 2669183860f6SAnand Jain out: 2670183860f6SAnand Jain kfree(vol_args); 2671c47ca32dSDan Carpenter err_drop: 26724ac20c70SIlya Dryomov mnt_drop_write_file(file); 2673f46b5a66SChristoph Hellwig return ret; 2674f46b5a66SChristoph Hellwig } 2675f46b5a66SChristoph Hellwig 2676475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2677475f6387SJan Schmidt { 2678027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2679475f6387SJan Schmidt struct btrfs_device *device; 2680475f6387SJan Schmidt struct btrfs_device *next; 2681475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2682027ed2f0SLi Zefan int ret = 0; 2683475f6387SJan Schmidt 2684027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2685027ed2f0SLi Zefan if (!fi_args) 2686027ed2f0SLi Zefan return -ENOMEM; 2687027ed2f0SLi Zefan 2688f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2689027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2690027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2691475f6387SJan Schmidt 2692475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2693027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2694027ed2f0SLi Zefan fi_args->max_id = device->devid; 2695475f6387SJan Schmidt } 2696475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2697475f6387SJan Schmidt 269880a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 269980a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 270080a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 270180a773fbSDavid Sterba 2702027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2703027ed2f0SLi Zefan ret = -EFAULT; 2704475f6387SJan Schmidt 2705027ed2f0SLi Zefan kfree(fi_args); 2706027ed2f0SLi Zefan return ret; 2707475f6387SJan Schmidt } 2708475f6387SJan Schmidt 2709475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2710475f6387SJan Schmidt { 2711475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2712475f6387SJan Schmidt struct btrfs_device *dev; 2713475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2714475f6387SJan Schmidt int ret = 0; 2715475f6387SJan Schmidt char *s_uuid = NULL; 2716475f6387SJan Schmidt 2717475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2718475f6387SJan Schmidt if (IS_ERR(di_args)) 2719475f6387SJan Schmidt return PTR_ERR(di_args); 2720475f6387SJan Schmidt 2721dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2722475f6387SJan Schmidt s_uuid = di_args->uuid; 2723475f6387SJan Schmidt 2724475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2725aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2726475f6387SJan Schmidt 2727475f6387SJan Schmidt if (!dev) { 2728475f6387SJan Schmidt ret = -ENODEV; 2729475f6387SJan Schmidt goto out; 2730475f6387SJan Schmidt } 2731475f6387SJan Schmidt 2732475f6387SJan Schmidt di_args->devid = dev->devid; 27337cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27347cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2735475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2736a27202fbSJim Meyering if (dev->name) { 2737606686eeSJosef Bacik struct rcu_string *name; 2738606686eeSJosef Bacik 2739606686eeSJosef Bacik rcu_read_lock(); 2740606686eeSJosef Bacik name = rcu_dereference(dev->name); 2741606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2742606686eeSJosef Bacik rcu_read_unlock(); 2743a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2744a27202fbSJim Meyering } else { 274599ba55adSStefan Behrens di_args->path[0] = '\0'; 2746a27202fbSJim Meyering } 2747475f6387SJan Schmidt 2748475f6387SJan Schmidt out: 274955793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2750475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2751475f6387SJan Schmidt ret = -EFAULT; 2752475f6387SJan Schmidt 2753475f6387SJan Schmidt kfree(di_args); 2754475f6387SJan Schmidt return ret; 2755475f6387SJan Schmidt } 2756475f6387SJan Schmidt 2757416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2758416161dbSMark Fasheh { 2759416161dbSMark Fasheh struct page *page; 2760416161dbSMark Fasheh pgoff_t index; 2761416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2762416161dbSMark Fasheh 2763416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2764416161dbSMark Fasheh 2765416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2766416161dbSMark Fasheh if (!page) 2767416161dbSMark Fasheh return NULL; 2768416161dbSMark Fasheh 2769416161dbSMark Fasheh if (!PageUptodate(page)) { 2770416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2771416161dbSMark Fasheh 0)) 2772416161dbSMark Fasheh return NULL; 2773416161dbSMark Fasheh lock_page(page); 2774416161dbSMark Fasheh if (!PageUptodate(page)) { 2775416161dbSMark Fasheh unlock_page(page); 2776416161dbSMark Fasheh page_cache_release(page); 2777416161dbSMark Fasheh return NULL; 2778416161dbSMark Fasheh } 2779416161dbSMark Fasheh } 2780416161dbSMark Fasheh unlock_page(page); 2781416161dbSMark Fasheh 2782416161dbSMark Fasheh return page; 2783416161dbSMark Fasheh } 2784416161dbSMark Fasheh 278577fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 278677fe20dcSMark Fasheh { 278777fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 278877fe20dcSMark Fasheh another, and lock file content */ 278977fe20dcSMark Fasheh while (1) { 279077fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 279177fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 279277fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 279377fe20dcSMark Fasheh off + len - 1); 2794ff5df9b8SFilipe Manana if ((!ordered || 2795ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2796ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 279777fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2798ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2799ff5df9b8SFilipe Manana if (ordered) 2800ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 280177fe20dcSMark Fasheh break; 2802ff5df9b8SFilipe Manana } 280377fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 280477fe20dcSMark Fasheh if (ordered) 280577fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 280677fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 280777fe20dcSMark Fasheh } 280877fe20dcSMark Fasheh } 280977fe20dcSMark Fasheh 2810416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2811416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2812416161dbSMark Fasheh { 2813416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2814416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2815416161dbSMark Fasheh 2816416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2817416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2818416161dbSMark Fasheh } 2819416161dbSMark Fasheh 2820416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2821416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2822416161dbSMark Fasheh { 2823416161dbSMark Fasheh if (inode1 < inode2) { 2824416161dbSMark Fasheh swap(inode1, inode2); 2825416161dbSMark Fasheh swap(loff1, loff2); 2826416161dbSMark Fasheh } 2827416161dbSMark Fasheh 2828416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2829416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2830416161dbSMark Fasheh if (inode1 != inode2) { 2831416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2832416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2833416161dbSMark Fasheh } 2834416161dbSMark Fasheh } 2835416161dbSMark Fasheh 2836416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2837416161dbSMark Fasheh u64 dst_loff, u64 len) 2838416161dbSMark Fasheh { 2839416161dbSMark Fasheh int ret = 0; 2840416161dbSMark Fasheh struct page *src_page, *dst_page; 2841416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2842416161dbSMark Fasheh void *addr, *dst_addr; 2843416161dbSMark Fasheh 2844416161dbSMark Fasheh while (len) { 2845416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2846416161dbSMark Fasheh cmp_len = len; 2847416161dbSMark Fasheh 2848416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2849416161dbSMark Fasheh if (!src_page) 2850416161dbSMark Fasheh return -EINVAL; 2851416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2852416161dbSMark Fasheh if (!dst_page) { 2853416161dbSMark Fasheh page_cache_release(src_page); 2854416161dbSMark Fasheh return -EINVAL; 2855416161dbSMark Fasheh } 2856416161dbSMark Fasheh addr = kmap_atomic(src_page); 2857416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2858416161dbSMark Fasheh 2859416161dbSMark Fasheh flush_dcache_page(src_page); 2860416161dbSMark Fasheh flush_dcache_page(dst_page); 2861416161dbSMark Fasheh 2862416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2863416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2864416161dbSMark Fasheh 2865416161dbSMark Fasheh kunmap_atomic(addr); 2866416161dbSMark Fasheh kunmap_atomic(dst_addr); 2867416161dbSMark Fasheh page_cache_release(src_page); 2868416161dbSMark Fasheh page_cache_release(dst_page); 2869416161dbSMark Fasheh 2870416161dbSMark Fasheh if (ret) 2871416161dbSMark Fasheh break; 2872416161dbSMark Fasheh 2873416161dbSMark Fasheh loff += cmp_len; 2874416161dbSMark Fasheh dst_loff += cmp_len; 2875416161dbSMark Fasheh len -= cmp_len; 2876416161dbSMark Fasheh } 2877416161dbSMark Fasheh 2878416161dbSMark Fasheh return ret; 2879416161dbSMark Fasheh } 2880416161dbSMark Fasheh 2881416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2882416161dbSMark Fasheh { 2883416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2884416161dbSMark Fasheh 2885416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2886416161dbSMark Fasheh return -EINVAL; 2887416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2888416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2889416161dbSMark Fasheh return -EINVAL; 2890416161dbSMark Fasheh 2891416161dbSMark Fasheh return 0; 2892416161dbSMark Fasheh } 2893416161dbSMark Fasheh 2894416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2895416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2896416161dbSMark Fasheh { 2897416161dbSMark Fasheh int ret; 2898416161dbSMark Fasheh 2899416161dbSMark Fasheh /* 2900416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2901416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2902416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2903416161dbSMark Fasheh */ 2904416161dbSMark Fasheh if (src == dst) 2905416161dbSMark Fasheh return -EINVAL; 2906416161dbSMark Fasheh 2907113e8283SFilipe Manana if (len == 0) 2908113e8283SFilipe Manana return 0; 2909113e8283SFilipe Manana 2910416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2911416161dbSMark Fasheh 2912416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2913416161dbSMark Fasheh if (ret) 2914416161dbSMark Fasheh goto out_unlock; 2915416161dbSMark Fasheh 2916416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2917416161dbSMark Fasheh if (ret) 2918416161dbSMark Fasheh goto out_unlock; 2919416161dbSMark Fasheh 2920416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2921416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2922416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2923416161dbSMark Fasheh ret = -EINVAL; 2924416161dbSMark Fasheh goto out_unlock; 2925416161dbSMark Fasheh } 2926416161dbSMark Fasheh 2927416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2928416161dbSMark Fasheh if (ret == 0) 2929416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2930416161dbSMark Fasheh 2931416161dbSMark Fasheh out_unlock: 2932416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2933416161dbSMark Fasheh 2934416161dbSMark Fasheh return ret; 2935416161dbSMark Fasheh } 2936416161dbSMark Fasheh 2937416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2938416161dbSMark Fasheh 2939416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 29401c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 2941416161dbSMark Fasheh { 2942cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2943cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 29441c1c8747SAl Viro struct inode *src = file_inode(file); 2945416161dbSMark Fasheh u64 off; 2946416161dbSMark Fasheh u64 len; 2947416161dbSMark Fasheh int i; 2948416161dbSMark Fasheh int ret; 2949cbf8b8caSMark Fasheh unsigned long size; 2950416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2951416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 29521c1c8747SAl Viro u16 count; 2953416161dbSMark Fasheh 2954416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2955416161dbSMark Fasheh return -EINVAL; 2956416161dbSMark Fasheh 2957416161dbSMark Fasheh ret = mnt_want_write_file(file); 2958416161dbSMark Fasheh if (ret) 2959416161dbSMark Fasheh return ret; 2960416161dbSMark Fasheh 29611c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 2962416161dbSMark Fasheh ret = -EFAULT; 2963416161dbSMark Fasheh goto out; 2964416161dbSMark Fasheh } 2965416161dbSMark Fasheh 29661c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 2967cbf8b8caSMark Fasheh 29681c1c8747SAl Viro same = memdup_user(argp, size); 2969cbf8b8caSMark Fasheh 2970229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2971229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2972cbf8b8caSMark Fasheh goto out; 2973cbf8b8caSMark Fasheh } 2974cbf8b8caSMark Fasheh 2975cbf8b8caSMark Fasheh off = same->logical_offset; 2976cbf8b8caSMark Fasheh len = same->length; 2977416161dbSMark Fasheh 2978416161dbSMark Fasheh /* 2979416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2980416161dbSMark Fasheh * This is intended to bound the total time spent in this 2981416161dbSMark Fasheh * ioctl to something sane. 2982416161dbSMark Fasheh */ 2983416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2984416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2985416161dbSMark Fasheh 2986416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2987416161dbSMark Fasheh /* 2988416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2989416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2990416161dbSMark Fasheh * this situation without an update. 2991416161dbSMark Fasheh */ 2992416161dbSMark Fasheh ret = -EINVAL; 2993416161dbSMark Fasheh goto out; 2994416161dbSMark Fasheh } 2995416161dbSMark Fasheh 2996416161dbSMark Fasheh ret = -EISDIR; 2997416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2998416161dbSMark Fasheh goto out; 2999416161dbSMark Fasheh 3000416161dbSMark Fasheh ret = -EACCES; 3001416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 3002416161dbSMark Fasheh goto out; 3003416161dbSMark Fasheh 3004cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 30051c1c8747SAl Viro for (i = 0; i < count; i++) { 3006cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 3007cbf8b8caSMark Fasheh same->info[i].status = 0; 3008416161dbSMark Fasheh } 3009416161dbSMark Fasheh 30101c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 30111c1c8747SAl Viro struct inode *dst; 30121c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 30131c1c8747SAl Viro if (!dst_file.file) { 3014cbf8b8caSMark Fasheh info->status = -EBADF; 30151c1c8747SAl Viro continue; 3016416161dbSMark Fasheh } 30171c1c8747SAl Viro dst = file_inode(dst_file.file); 3018416161dbSMark Fasheh 30191c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 3020cbf8b8caSMark Fasheh info->status = -EINVAL; 30211c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 3022cbf8b8caSMark Fasheh info->status = -EXDEV; 30231c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 3024cbf8b8caSMark Fasheh info->status = -EISDIR; 30251c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 3026cbf8b8caSMark Fasheh info->status = -EACCES; 30271c1c8747SAl Viro } else { 3028cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 3029cbf8b8caSMark Fasheh info->logical_offset); 3030cbf8b8caSMark Fasheh if (info->status == 0) 3031cbf8b8caSMark Fasheh info->bytes_deduped += len; 30321c1c8747SAl Viro } 30331c1c8747SAl Viro fdput(dst_file); 3034cbf8b8caSMark Fasheh } 3035416161dbSMark Fasheh 3036cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 3037cbf8b8caSMark Fasheh if (ret) 3038416161dbSMark Fasheh ret = -EFAULT; 3039416161dbSMark Fasheh 3040416161dbSMark Fasheh out: 3041416161dbSMark Fasheh mnt_drop_write_file(file); 3042416161dbSMark Fasheh return ret; 3043416161dbSMark Fasheh } 3044416161dbSMark Fasheh 3045fcebe456SJosef Bacik /* Helper to check and see if this root currently has a ref on the given disk 3046fcebe456SJosef Bacik * bytenr. If it does then we need to update the quota for this root. This 3047fcebe456SJosef Bacik * doesn't do anything if quotas aren't enabled. 3048fcebe456SJosef Bacik */ 3049fcebe456SJosef Bacik static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3050fcebe456SJosef Bacik u64 disko) 3051fcebe456SJosef Bacik { 30523284da7bSDavid Sterba struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem); 3053fcebe456SJosef Bacik struct ulist *roots; 3054fcebe456SJosef Bacik struct ulist_iterator uiter; 3055fcebe456SJosef Bacik struct ulist_node *root_node = NULL; 3056fcebe456SJosef Bacik int ret; 3057fcebe456SJosef Bacik 3058fcebe456SJosef Bacik if (!root->fs_info->quota_enabled) 3059fcebe456SJosef Bacik return 1; 3060fcebe456SJosef Bacik 3061fcebe456SJosef Bacik btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3062fcebe456SJosef Bacik ret = btrfs_find_all_roots(trans, root->fs_info, disko, 3063fcebe456SJosef Bacik tree_mod_seq_elem.seq, &roots); 3064fcebe456SJosef Bacik if (ret < 0) 3065fcebe456SJosef Bacik goto out; 3066fcebe456SJosef Bacik ret = 0; 3067fcebe456SJosef Bacik ULIST_ITER_INIT(&uiter); 3068fcebe456SJosef Bacik while ((root_node = ulist_next(roots, &uiter))) { 3069fcebe456SJosef Bacik if (root_node->val == root->objectid) { 3070fcebe456SJosef Bacik ret = 1; 3071fcebe456SJosef Bacik break; 3072fcebe456SJosef Bacik } 3073fcebe456SJosef Bacik } 3074fcebe456SJosef Bacik ulist_free(roots); 3075fcebe456SJosef Bacik out: 3076fcebe456SJosef Bacik btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3077fcebe456SJosef Bacik return ret; 3078fcebe456SJosef Bacik } 3079fcebe456SJosef Bacik 3080f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3081f82a9901SFilipe Manana struct inode *inode, 3082f82a9901SFilipe Manana u64 endoff, 3083f82a9901SFilipe Manana const u64 destoff, 3084f82a9901SFilipe Manana const u64 olen) 3085f82a9901SFilipe Manana { 3086f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3087f82a9901SFilipe Manana int ret; 3088f82a9901SFilipe Manana 3089f82a9901SFilipe Manana inode_inc_iversion(inode); 3090f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3091f82a9901SFilipe Manana /* 3092f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3093f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3094f82a9901SFilipe Manana */ 3095f82a9901SFilipe Manana if (endoff > destoff + olen) 3096f82a9901SFilipe Manana endoff = destoff + olen; 3097f82a9901SFilipe Manana if (endoff > inode->i_size) 3098f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3099f82a9901SFilipe Manana 3100f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3101f82a9901SFilipe Manana if (ret) { 3102f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3103f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3104f82a9901SFilipe Manana goto out; 3105f82a9901SFilipe Manana } 3106f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3107f82a9901SFilipe Manana out: 3108f82a9901SFilipe Manana return ret; 3109f82a9901SFilipe Manana } 3110f82a9901SFilipe Manana 31117ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 31127ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 31137ffbb598SFilipe Manana const struct btrfs_path *path, 31147ffbb598SFilipe Manana const u64 hole_offset, 31157ffbb598SFilipe Manana const u64 hole_len) 31167ffbb598SFilipe Manana { 31177ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 31187ffbb598SFilipe Manana struct extent_map *em; 31197ffbb598SFilipe Manana int ret; 31207ffbb598SFilipe Manana 31217ffbb598SFilipe Manana em = alloc_extent_map(); 31227ffbb598SFilipe Manana if (!em) { 31237ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31247ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31257ffbb598SFilipe Manana return; 31267ffbb598SFilipe Manana } 31277ffbb598SFilipe Manana 312814f59796SFilipe Manana if (path) { 312914f59796SFilipe Manana struct btrfs_file_extent_item *fi; 313014f59796SFilipe Manana 313114f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 313214f59796SFilipe Manana struct btrfs_file_extent_item); 31337ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 31347ffbb598SFilipe Manana em->generation = -1; 31357ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 31367ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 31377ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31387ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31397ffbb598SFilipe Manana } else { 31407ffbb598SFilipe Manana em->start = hole_offset; 31417ffbb598SFilipe Manana em->len = hole_len; 31427ffbb598SFilipe Manana em->ram_bytes = em->len; 31437ffbb598SFilipe Manana em->orig_start = hole_offset; 31447ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 31457ffbb598SFilipe Manana em->block_len = 0; 31467ffbb598SFilipe Manana em->orig_block_len = 0; 31477ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 31487ffbb598SFilipe Manana em->generation = trans->transid; 31497ffbb598SFilipe Manana } 31507ffbb598SFilipe Manana 31517ffbb598SFilipe Manana while (1) { 31527ffbb598SFilipe Manana write_lock(&em_tree->lock); 31537ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 31547ffbb598SFilipe Manana write_unlock(&em_tree->lock); 31557ffbb598SFilipe Manana if (ret != -EEXIST) { 31567ffbb598SFilipe Manana free_extent_map(em); 31577ffbb598SFilipe Manana break; 31587ffbb598SFilipe Manana } 31597ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 31607ffbb598SFilipe Manana em->start + em->len - 1, 0); 31617ffbb598SFilipe Manana } 31627ffbb598SFilipe Manana 3163ee39b432SDavid Sterba if (ret) 31647ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31657ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31667ffbb598SFilipe Manana } 31677ffbb598SFilipe Manana 316832b7c687SMark Fasheh /** 316932b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 317032b7c687SMark Fasheh * 317132b7c687SMark Fasheh * @src: Inode to clone from 317232b7c687SMark Fasheh * @inode: Inode to clone to 317332b7c687SMark Fasheh * @off: Offset within source to start clone from 317432b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 317532b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 317632b7c687SMark Fasheh * identical values here 317732b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 317832b7c687SMark Fasheh */ 317932b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3180f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 3181f82a9901SFilipe Manana const u64 destoff) 3182f46b5a66SChristoph Hellwig { 3183f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 318432b7c687SMark Fasheh struct btrfs_path *path = NULL; 3185f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 318632b7c687SMark Fasheh struct btrfs_trans_handle *trans; 318732b7c687SMark Fasheh char *buf = NULL; 3188ae01a0abSYan Zheng struct btrfs_key key; 3189f46b5a66SChristoph Hellwig u32 nritems; 3190f46b5a66SChristoph Hellwig int slot; 3191ae01a0abSYan Zheng int ret; 3192fcebe456SJosef Bacik int no_quota; 3193f82a9901SFilipe Manana const u64 len = olen_aligned; 3194fcebe456SJosef Bacik u64 last_disko = 0; 3195f82a9901SFilipe Manana u64 last_dest_end = destoff; 3196ae01a0abSYan Zheng 3197ae01a0abSYan Zheng ret = -ENOMEM; 3198707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3199ae01a0abSYan Zheng if (!buf) 320032b7c687SMark Fasheh return ret; 3201ae01a0abSYan Zheng 3202ae01a0abSYan Zheng path = btrfs_alloc_path(); 3203ae01a0abSYan Zheng if (!path) { 3204ae01a0abSYan Zheng vfree(buf); 320532b7c687SMark Fasheh return ret; 3206ae01a0abSYan Zheng } 320732b7c687SMark Fasheh 3208ae01a0abSYan Zheng path->reada = 2; 3209c5c9cd4dSSage Weil /* clone data */ 321033345d01SLi Zefan key.objectid = btrfs_ino(src); 3211ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 32122c463823SFilipe Manana key.offset = off; 3213f46b5a66SChristoph Hellwig 3214f46b5a66SChristoph Hellwig while (1) { 3215de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3216df858e76SFilipe Manana 3217f46b5a66SChristoph Hellwig /* 3218f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3219f46b5a66SChristoph Hellwig * tree. 3220f46b5a66SChristoph Hellwig */ 3221e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3222362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3223362a20c5SDavid Sterba 0, 0); 3224f46b5a66SChristoph Hellwig if (ret < 0) 3225f46b5a66SChristoph Hellwig goto out; 32262c463823SFilipe Manana /* 32272c463823SFilipe Manana * First search, if no extent item that starts at offset off was 32282c463823SFilipe Manana * found but the previous item is an extent item, it's possible 32292c463823SFilipe Manana * it might overlap our target range, therefore process it. 32302c463823SFilipe Manana */ 32312c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 32322c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 32332c463823SFilipe Manana path->slots[0] - 1); 32342c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 32352c463823SFilipe Manana path->slots[0]--; 32362c463823SFilipe Manana } 3237f46b5a66SChristoph Hellwig 3238ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3239e4355f34SFilipe David Borba Manana process_slot: 3240fcebe456SJosef Bacik no_quota = 1; 3241ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3242362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3243f46b5a66SChristoph Hellwig if (ret < 0) 3244f46b5a66SChristoph Hellwig goto out; 3245f46b5a66SChristoph Hellwig if (ret > 0) 3246f46b5a66SChristoph Hellwig break; 3247ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3248f46b5a66SChristoph Hellwig } 3249f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3250f46b5a66SChristoph Hellwig slot = path->slots[0]; 3251f46b5a66SChristoph Hellwig 3252ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3253962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 325433345d01SLi Zefan key.objectid != btrfs_ino(src)) 3255f46b5a66SChristoph Hellwig break; 3256f46b5a66SChristoph Hellwig 3257962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3258c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3259c5c9cd4dSSage Weil int type; 326031840ae1SZheng Yan u32 size; 326131840ae1SZheng Yan struct btrfs_key new_key; 3262c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3263c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3264c5c9cd4dSSage Weil u8 comp; 3265f82a9901SFilipe Manana u64 drop_start; 326631840ae1SZheng Yan 3267c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3268c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3269c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3270c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3271c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3272c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3273d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3274d397712bSChris Mason extent); 3275d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3276d397712bSChris Mason extent); 3277c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3278d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3279d397712bSChris Mason extent); 3280c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3281c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3282c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3283c5c9cd4dSSage Weil extent); 3284c5c9cd4dSSage Weil } 328531840ae1SZheng Yan 32862c463823SFilipe Manana /* 32872c463823SFilipe Manana * The first search might have left us at an extent 32882c463823SFilipe Manana * item that ends before our target range's start, can 32892c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 32902c463823SFilipe Manana */ 32912c463823SFilipe Manana if (key.offset + datal <= off) { 3292e4355f34SFilipe David Borba Manana path->slots[0]++; 3293e4355f34SFilipe David Borba Manana goto process_slot; 32942c463823SFilipe Manana } else if (key.offset >= off + len) { 32952c463823SFilipe Manana break; 3296e4355f34SFilipe David Borba Manana } 3297df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3298e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3299e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3300e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3301e4355f34SFilipe David Borba Manana size); 3302e4355f34SFilipe David Borba Manana 3303e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3304e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3305c5c9cd4dSSage Weil 330631840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 330733345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 33084d728ec7SLi Zefan if (off <= key.offset) 3309c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 33104d728ec7SLi Zefan else 33114d728ec7SLi Zefan new_key.offset = destoff; 3312c5c9cd4dSSage Weil 3313b6f3409bSSage Weil /* 3314f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3315f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3316f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3317f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3318f82a9901SFilipe Manana * partially overlaps it). 3319f82a9901SFilipe Manana */ 3320f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3321f82a9901SFilipe Manana drop_start = last_dest_end; 3322f82a9901SFilipe Manana else 3323f82a9901SFilipe Manana drop_start = new_key.offset; 3324f82a9901SFilipe Manana 3325f82a9901SFilipe Manana /* 3326b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3327b6f3409bSSage Weil * 1 - add new extent 3328b6f3409bSSage Weil * 1 - inode update 3329b6f3409bSSage Weil */ 3330b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3331a22285a6SYan, Zheng if (IS_ERR(trans)) { 3332a22285a6SYan, Zheng ret = PTR_ERR(trans); 3333a22285a6SYan, Zheng goto out; 3334a22285a6SYan, Zheng } 3335a22285a6SYan, Zheng 3336c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3337c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3338d72c0842SLi Zefan /* 3339d72c0842SLi Zefan * a | --- range to clone ---| b 3340d72c0842SLi Zefan * | ------------- extent ------------- | 3341d72c0842SLi Zefan */ 3342d72c0842SLi Zefan 334393915584SAntonio Ospite /* subtract range b */ 3344d72c0842SLi Zefan if (key.offset + datal > off + len) 3345d72c0842SLi Zefan datal = off + len - key.offset; 3346d72c0842SLi Zefan 334793915584SAntonio Ospite /* subtract range a */ 3348a22285a6SYan, Zheng if (off > key.offset) { 3349a22285a6SYan, Zheng datao += off - key.offset; 3350a22285a6SYan, Zheng datal -= off - key.offset; 3351a22285a6SYan, Zheng } 3352a22285a6SYan, Zheng 33535dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3354f82a9901SFilipe Manana drop_start, 3355a22285a6SYan, Zheng new_key.offset + datal, 33562671485dSJosef Bacik 1); 335779787eaaSJeff Mahoney if (ret) { 33583f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 335900fdf13aSLiu Bo btrfs_abort_transaction(trans, 336000fdf13aSLiu Bo root, ret); 336179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 336279787eaaSJeff Mahoney goto out; 336379787eaaSJeff Mahoney } 3364a22285a6SYan, Zheng 336531840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 336631840ae1SZheng Yan &new_key, size); 336779787eaaSJeff Mahoney if (ret) { 336879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 336979787eaaSJeff Mahoney ret); 337079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 337179787eaaSJeff Mahoney goto out; 337279787eaaSJeff Mahoney } 337331840ae1SZheng Yan 337431840ae1SZheng Yan leaf = path->nodes[0]; 337531840ae1SZheng Yan slot = path->slots[0]; 337631840ae1SZheng Yan write_extent_buffer(leaf, buf, 337731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 337831840ae1SZheng Yan size); 3379ae01a0abSYan Zheng 3380f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3381f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3382c5c9cd4dSSage Weil 3383c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3384c5c9cd4dSSage Weil if (!disko) 3385c5c9cd4dSSage Weil datao = 0; 3386c5c9cd4dSSage Weil 3387c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3388c5c9cd4dSSage Weil datao); 3389c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3390c5c9cd4dSSage Weil datal); 3391fcebe456SJosef Bacik 3392fcebe456SJosef Bacik /* 3393fcebe456SJosef Bacik * We need to look up the roots that point at 3394fcebe456SJosef Bacik * this bytenr and see if the new root does. If 3395fcebe456SJosef Bacik * it does not we need to make sure we update 3396fcebe456SJosef Bacik * quotas appropriately. 3397fcebe456SJosef Bacik */ 3398fcebe456SJosef Bacik if (disko && root != BTRFS_I(src)->root && 3399fcebe456SJosef Bacik disko != last_disko) { 3400fcebe456SJosef Bacik no_quota = check_ref(trans, root, 3401fcebe456SJosef Bacik disko); 3402fcebe456SJosef Bacik if (no_quota < 0) { 3403fcebe456SJosef Bacik btrfs_abort_transaction(trans, 3404fcebe456SJosef Bacik root, 3405fcebe456SJosef Bacik ret); 3406fcebe456SJosef Bacik btrfs_end_transaction(trans, 3407fcebe456SJosef Bacik root); 3408fcebe456SJosef Bacik ret = no_quota; 3409fcebe456SJosef Bacik goto out; 3410fcebe456SJosef Bacik } 3411fcebe456SJosef Bacik } 3412fcebe456SJosef Bacik 3413c5c9cd4dSSage Weil if (disko) { 3414c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3415ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 34165d4f98a2SYan Zheng disko, diskl, 0, 3417f46b5a66SChristoph Hellwig root->root_key.objectid, 341833345d01SLi Zefan btrfs_ino(inode), 341966d7e7f0SArne Jansen new_key.offset - datao, 3420fcebe456SJosef Bacik no_quota); 342179787eaaSJeff Mahoney if (ret) { 342279787eaaSJeff Mahoney btrfs_abort_transaction(trans, 342379787eaaSJeff Mahoney root, 342479787eaaSJeff Mahoney ret); 342579787eaaSJeff Mahoney btrfs_end_transaction(trans, 342679787eaaSJeff Mahoney root); 342779787eaaSJeff Mahoney goto out; 342879787eaaSJeff Mahoney 342979787eaaSJeff Mahoney } 3430f46b5a66SChristoph Hellwig } 3431c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3432c5c9cd4dSSage Weil u64 skip = 0; 3433c5c9cd4dSSage Weil u64 trim = 0; 3434d3ecfcdfSLiu Bo u64 aligned_end = 0; 3435d3ecfcdfSLiu Bo 3436c5c9cd4dSSage Weil if (off > key.offset) { 3437c5c9cd4dSSage Weil skip = off - key.offset; 3438c5c9cd4dSSage Weil new_key.offset += skip; 343931840ae1SZheng Yan } 3440d397712bSChris Mason 3441c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3442c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3443d397712bSChris Mason 3444c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3445c5c9cd4dSSage Weil ret = -EINVAL; 3446a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3447c5c9cd4dSSage Weil goto out; 344831840ae1SZheng Yan } 3449c5c9cd4dSSage Weil size -= skip + trim; 3450c5c9cd4dSSage Weil datal -= skip + trim; 3451a22285a6SYan, Zheng 3452d3ecfcdfSLiu Bo aligned_end = ALIGN(new_key.offset + datal, 3453d3ecfcdfSLiu Bo root->sectorsize); 34545dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3455f82a9901SFilipe Manana drop_start, 3456d3ecfcdfSLiu Bo aligned_end, 34572671485dSJosef Bacik 1); 345879787eaaSJeff Mahoney if (ret) { 34593f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 34603a29bc09SChris Mason btrfs_abort_transaction(trans, 34613a29bc09SChris Mason root, ret); 346279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 346379787eaaSJeff Mahoney goto out; 346479787eaaSJeff Mahoney } 3465a22285a6SYan, Zheng 3466c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3467c5c9cd4dSSage Weil &new_key, size); 346879787eaaSJeff Mahoney if (ret) { 346979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 347079787eaaSJeff Mahoney ret); 347179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 347279787eaaSJeff Mahoney goto out; 347379787eaaSJeff Mahoney } 3474c5c9cd4dSSage Weil 3475c5c9cd4dSSage Weil if (skip) { 3476d397712bSChris Mason u32 start = 3477d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3478c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3479c5c9cd4dSSage Weil datal); 3480c5c9cd4dSSage Weil } 3481c5c9cd4dSSage Weil 3482c5c9cd4dSSage Weil leaf = path->nodes[0]; 3483c5c9cd4dSSage Weil slot = path->slots[0]; 3484c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3485c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3486c5c9cd4dSSage Weil size); 3487c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3488c5c9cd4dSSage Weil } 3489c5c9cd4dSSage Weil 34907ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 34917ffbb598SFilipe Manana if (drop_start < new_key.offset) 34927ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 349314f59796SFilipe Manana NULL, drop_start, 34947ffbb598SFilipe Manana new_key.offset - drop_start); 34957ffbb598SFilipe Manana 349614f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 34977ffbb598SFilipe Manana 3498c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3499b3b4aa74SDavid Sterba btrfs_release_path(path); 3500c5c9cd4dSSage Weil 350162e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 350262e2390eSFilipe Manana root->sectorsize); 3503f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3504f82a9901SFilipe Manana last_dest_end, 3505f82a9901SFilipe Manana destoff, olen); 3506f82a9901SFilipe Manana if (ret) 350779787eaaSJeff Mahoney goto out; 35082c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 35092c463823SFilipe Manana break; 3510a22285a6SYan, Zheng } 3511b3b4aa74SDavid Sterba btrfs_release_path(path); 3512df858e76SFilipe Manana key.offset = next_key_min_offset; 3513ae01a0abSYan Zheng } 3514f46b5a66SChristoph Hellwig ret = 0; 351532b7c687SMark Fasheh 3516f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3517f82a9901SFilipe Manana /* 3518f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3519f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3520f82a9901SFilipe Manana */ 3521b3b4aa74SDavid Sterba btrfs_release_path(path); 3522f82a9901SFilipe Manana 3523f82a9901SFilipe Manana /* 3524f82a9901SFilipe Manana * 1 - remove extent(s) 3525f82a9901SFilipe Manana * 1 - inode update 3526f82a9901SFilipe Manana */ 3527f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3528f82a9901SFilipe Manana if (IS_ERR(trans)) { 3529f82a9901SFilipe Manana ret = PTR_ERR(trans); 3530f82a9901SFilipe Manana goto out; 3531f82a9901SFilipe Manana } 3532f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3533f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3534f82a9901SFilipe Manana if (ret) { 3535f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3536f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3537f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3538f82a9901SFilipe Manana goto out; 3539f82a9901SFilipe Manana } 354014f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 354114f59796SFilipe Manana destoff + len - last_dest_end); 3542f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 3543f82a9901SFilipe Manana destoff, olen); 3544f82a9901SFilipe Manana } 3545f82a9901SFilipe Manana 3546f46b5a66SChristoph Hellwig out: 354732b7c687SMark Fasheh btrfs_free_path(path); 354832b7c687SMark Fasheh vfree(buf); 354932b7c687SMark Fasheh return ret; 355032b7c687SMark Fasheh } 355132b7c687SMark Fasheh 355232b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 355332b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 355432b7c687SMark Fasheh { 355554563d41SAl Viro struct inode *inode = file_inode(file); 355632b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 355732b7c687SMark Fasheh struct fd src_file; 355832b7c687SMark Fasheh struct inode *src; 355932b7c687SMark Fasheh int ret; 356032b7c687SMark Fasheh u64 len = olen; 356132b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 356232b7c687SMark Fasheh int same_inode = 0; 356332b7c687SMark Fasheh 356432b7c687SMark Fasheh /* 356532b7c687SMark Fasheh * TODO: 356632b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 356732b7c687SMark Fasheh * decompress into destination's address_space (the file offset 356832b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 356932b7c687SMark Fasheh * otherwise reinsert) a subrange. 357000fdf13aSLiu Bo * 357100fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 357200fdf13aSLiu Bo * be either compressed or non-compressed. 357332b7c687SMark Fasheh */ 357432b7c687SMark Fasheh 357532b7c687SMark Fasheh /* the destination must be opened for writing */ 357632b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 357732b7c687SMark Fasheh return -EINVAL; 357832b7c687SMark Fasheh 357932b7c687SMark Fasheh if (btrfs_root_readonly(root)) 358032b7c687SMark Fasheh return -EROFS; 358132b7c687SMark Fasheh 358232b7c687SMark Fasheh ret = mnt_want_write_file(file); 358332b7c687SMark Fasheh if (ret) 358432b7c687SMark Fasheh return ret; 358532b7c687SMark Fasheh 358632b7c687SMark Fasheh src_file = fdget(srcfd); 358732b7c687SMark Fasheh if (!src_file.file) { 358832b7c687SMark Fasheh ret = -EBADF; 358932b7c687SMark Fasheh goto out_drop_write; 359032b7c687SMark Fasheh } 359132b7c687SMark Fasheh 359232b7c687SMark Fasheh ret = -EXDEV; 359332b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 359432b7c687SMark Fasheh goto out_fput; 359532b7c687SMark Fasheh 359632b7c687SMark Fasheh src = file_inode(src_file.file); 359732b7c687SMark Fasheh 359832b7c687SMark Fasheh ret = -EINVAL; 359932b7c687SMark Fasheh if (src == inode) 360032b7c687SMark Fasheh same_inode = 1; 360132b7c687SMark Fasheh 360232b7c687SMark Fasheh /* the src must be open for reading */ 360332b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 360432b7c687SMark Fasheh goto out_fput; 360532b7c687SMark Fasheh 360632b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 360732b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 360832b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 360932b7c687SMark Fasheh goto out_fput; 361032b7c687SMark Fasheh 361132b7c687SMark Fasheh ret = -EISDIR; 361232b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 361332b7c687SMark Fasheh goto out_fput; 361432b7c687SMark Fasheh 361532b7c687SMark Fasheh ret = -EXDEV; 361632b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 361732b7c687SMark Fasheh goto out_fput; 361832b7c687SMark Fasheh 361932b7c687SMark Fasheh if (!same_inode) { 362032b7c687SMark Fasheh if (inode < src) { 362132b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 362232b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 362332b7c687SMark Fasheh } else { 362432b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 362532b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 362632b7c687SMark Fasheh } 362732b7c687SMark Fasheh } else { 362832b7c687SMark Fasheh mutex_lock(&src->i_mutex); 362932b7c687SMark Fasheh } 363032b7c687SMark Fasheh 363132b7c687SMark Fasheh /* determine range to clone */ 363232b7c687SMark Fasheh ret = -EINVAL; 363332b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 363432b7c687SMark Fasheh goto out_unlock; 363532b7c687SMark Fasheh if (len == 0) 363632b7c687SMark Fasheh olen = len = src->i_size - off; 363732b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 363832b7c687SMark Fasheh if (off + len == src->i_size) 363932b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 364032b7c687SMark Fasheh 3641ccccf3d6SFilipe Manana if (len == 0) { 3642ccccf3d6SFilipe Manana ret = 0; 3643ccccf3d6SFilipe Manana goto out_unlock; 3644ccccf3d6SFilipe Manana } 3645ccccf3d6SFilipe Manana 364632b7c687SMark Fasheh /* verify the end result is block aligned */ 364732b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 364832b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 364932b7c687SMark Fasheh goto out_unlock; 365032b7c687SMark Fasheh 365132b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 365232b7c687SMark Fasheh if (same_inode) { 365332b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 365432b7c687SMark Fasheh goto out_unlock; 365532b7c687SMark Fasheh } 365632b7c687SMark Fasheh 365732b7c687SMark Fasheh if (destoff > inode->i_size) { 365832b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 365932b7c687SMark Fasheh if (ret) 366032b7c687SMark Fasheh goto out_unlock; 366132b7c687SMark Fasheh } 366232b7c687SMark Fasheh 3663c125b8bfSFilipe Manana /* 3664c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3665c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3666c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3667c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3668c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3669c125b8bfSFilipe Manana */ 3670c125b8bfSFilipe Manana if (same_inode) { 3671c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3672c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 367332b7c687SMark Fasheh 3674c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3675c125b8bfSFilipe Manana } else { 367632b7c687SMark Fasheh lock_extent_range(src, off, len); 3677c125b8bfSFilipe Manana lock_extent_range(inode, destoff, len); 3678c125b8bfSFilipe Manana } 367932b7c687SMark Fasheh 368032b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 368132b7c687SMark Fasheh 3682c125b8bfSFilipe Manana if (same_inode) { 3683c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3684c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3685c125b8bfSFilipe Manana 3686c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3687c125b8bfSFilipe Manana } else { 3688aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3689c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(inode)->io_tree, destoff, 3690c125b8bfSFilipe Manana destoff + len - 1); 3691c125b8bfSFilipe Manana } 3692c125b8bfSFilipe Manana /* 3693c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3694c125b8bfSFilipe Manana * data immediately and not the previous data. 3695c125b8bfSFilipe Manana */ 3696c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3697c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3698f46b5a66SChristoph Hellwig out_unlock: 3699c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3700c57c2b3eSFilipe David Borba Manana if (inode < src) { 3701f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3702f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3703c57c2b3eSFilipe David Borba Manana } else { 3704c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3705c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3706c57c2b3eSFilipe David Borba Manana } 3707c57c2b3eSFilipe David Borba Manana } else { 3708c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3709c57c2b3eSFilipe David Borba Manana } 3710f46b5a66SChristoph Hellwig out_fput: 37112903ff01SAl Viro fdput(src_file); 3712ab67b7c1SYan Zheng out_drop_write: 37132a79f17eSAl Viro mnt_drop_write_file(file); 3714f46b5a66SChristoph Hellwig return ret; 3715f46b5a66SChristoph Hellwig } 3716f46b5a66SChristoph Hellwig 37177a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3718c5c9cd4dSSage Weil { 3719c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3720c5c9cd4dSSage Weil 37217a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3722c5c9cd4dSSage Weil return -EFAULT; 3723c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3724c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3725c5c9cd4dSSage Weil } 3726c5c9cd4dSSage Weil 3727f46b5a66SChristoph Hellwig /* 3728f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3729f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3730f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3731f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3732f46b5a66SChristoph Hellwig */ 3733b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3734f46b5a66SChristoph Hellwig { 3735496ad9aaSAl Viro struct inode *inode = file_inode(file); 3736f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3737f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 37381ab86aedSSage Weil int ret; 3739f46b5a66SChristoph Hellwig 37401ab86aedSSage Weil ret = -EPERM; 3741df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3742f46b5a66SChristoph Hellwig goto out; 37431ab86aedSSage Weil 37441ab86aedSSage Weil ret = -EINPROGRESS; 37451ab86aedSSage Weil if (file->private_data) 37461ab86aedSSage Weil goto out; 37479ca9ee09SSage Weil 3748b83cc969SLi Zefan ret = -EROFS; 3749b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3750b83cc969SLi Zefan goto out; 3751b83cc969SLi Zefan 3752a561be71SAl Viro ret = mnt_want_write_file(file); 3753c146afadSYan Zheng if (ret) 3754c146afadSYan Zheng goto out; 3755c146afadSYan Zheng 3756a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 37579ca9ee09SSage Weil 3758f46b5a66SChristoph Hellwig ret = -ENOMEM; 37597a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3760abd30bb0STsutomu Itoh if (IS_ERR(trans)) 37611ab86aedSSage Weil goto out_drop; 37621ab86aedSSage Weil 37631ab86aedSSage Weil file->private_data = trans; 37641ab86aedSSage Weil return 0; 37651ab86aedSSage Weil 37661ab86aedSSage Weil out_drop: 3767a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 37682a79f17eSAl Viro mnt_drop_write_file(file); 3769f46b5a66SChristoph Hellwig out: 3770f46b5a66SChristoph Hellwig return ret; 3771f46b5a66SChristoph Hellwig } 3772f46b5a66SChristoph Hellwig 37736ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37746ef5ed0dSJosef Bacik { 3775496ad9aaSAl Viro struct inode *inode = file_inode(file); 37766ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37776ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37786ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37796ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37806ef5ed0dSJosef Bacik struct btrfs_path *path; 37816ef5ed0dSJosef Bacik struct btrfs_key location; 37826ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37836ef5ed0dSJosef Bacik u64 objectid = 0; 37846ef5ed0dSJosef Bacik u64 dir_id; 37853c04ce01SMiao Xie int ret; 37866ef5ed0dSJosef Bacik 37876ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37886ef5ed0dSJosef Bacik return -EPERM; 37896ef5ed0dSJosef Bacik 37903c04ce01SMiao Xie ret = mnt_want_write_file(file); 37913c04ce01SMiao Xie if (ret) 37923c04ce01SMiao Xie return ret; 37933c04ce01SMiao Xie 37943c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37953c04ce01SMiao Xie ret = -EFAULT; 37963c04ce01SMiao Xie goto out; 37973c04ce01SMiao Xie } 37986ef5ed0dSJosef Bacik 37996ef5ed0dSJosef Bacik if (!objectid) 38001cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 38016ef5ed0dSJosef Bacik 38026ef5ed0dSJosef Bacik location.objectid = objectid; 38036ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 38046ef5ed0dSJosef Bacik location.offset = (u64)-1; 38056ef5ed0dSJosef Bacik 38066ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 38073c04ce01SMiao Xie if (IS_ERR(new_root)) { 38083c04ce01SMiao Xie ret = PTR_ERR(new_root); 38093c04ce01SMiao Xie goto out; 38103c04ce01SMiao Xie } 38116ef5ed0dSJosef Bacik 38126ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38133c04ce01SMiao Xie if (!path) { 38143c04ce01SMiao Xie ret = -ENOMEM; 38153c04ce01SMiao Xie goto out; 38163c04ce01SMiao Xie } 38176ef5ed0dSJosef Bacik path->leave_spinning = 1; 38186ef5ed0dSJosef Bacik 38196ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 382098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38216ef5ed0dSJosef Bacik btrfs_free_path(path); 38223c04ce01SMiao Xie ret = PTR_ERR(trans); 38233c04ce01SMiao Xie goto out; 38246ef5ed0dSJosef Bacik } 38256ef5ed0dSJosef Bacik 38266c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 38276ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 38286ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3829cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38306ef5ed0dSJosef Bacik btrfs_free_path(path); 38316ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3832efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3833efe120a0SFrank Holton "item, this isn't going to work"); 38343c04ce01SMiao Xie ret = -ENOENT; 38353c04ce01SMiao Xie goto out; 38366ef5ed0dSJosef Bacik } 38376ef5ed0dSJosef Bacik 38386ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38396ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38406ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38416ef5ed0dSJosef Bacik btrfs_free_path(path); 38426ef5ed0dSJosef Bacik 38432b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 38446ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 38453c04ce01SMiao Xie out: 38463c04ce01SMiao Xie mnt_drop_write_file(file); 38473c04ce01SMiao Xie return ret; 38486ef5ed0dSJosef Bacik } 38496ef5ed0dSJosef Bacik 38505af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3851bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3852bf5fc093SJosef Bacik { 3853bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3854bf5fc093SJosef Bacik 3855bf5fc093SJosef Bacik space->total_bytes = 0; 3856bf5fc093SJosef Bacik space->used_bytes = 0; 3857bf5fc093SJosef Bacik space->flags = 0; 3858bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3859bf5fc093SJosef Bacik space->flags = block_group->flags; 3860bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3861bf5fc093SJosef Bacik space->used_bytes += 3862bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3863bf5fc093SJosef Bacik } 3864bf5fc093SJosef Bacik } 3865bf5fc093SJosef Bacik 386648a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 38671406e432SJosef Bacik { 38681406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38691406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38701406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38717fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 387213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38731406e432SJosef Bacik struct btrfs_space_info *info; 3874bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3875bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3876bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3877bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3878bf5fc093SJosef Bacik int num_types = 4; 38797fde62bfSChris Mason int alloc_size; 38801406e432SJosef Bacik int ret = 0; 388151788b1bSDan Rosenberg u64 slot_count = 0; 3882bf5fc093SJosef Bacik int i, c; 38831406e432SJosef Bacik 38841406e432SJosef Bacik if (copy_from_user(&space_args, 38851406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38861406e432SJosef Bacik sizeof(space_args))) 38871406e432SJosef Bacik return -EFAULT; 38881406e432SJosef Bacik 3889bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3890bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3891bf5fc093SJosef Bacik 3892bf5fc093SJosef Bacik info = NULL; 38937fde62bfSChris Mason rcu_read_lock(); 3894bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3895bf5fc093SJosef Bacik list) { 3896bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3897bf5fc093SJosef Bacik info = tmp; 3898bf5fc093SJosef Bacik break; 3899bf5fc093SJosef Bacik } 3900bf5fc093SJosef Bacik } 39017fde62bfSChris Mason rcu_read_unlock(); 39021406e432SJosef Bacik 3903bf5fc093SJosef Bacik if (!info) 3904bf5fc093SJosef Bacik continue; 3905bf5fc093SJosef Bacik 3906bf5fc093SJosef Bacik down_read(&info->groups_sem); 3907bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3908bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3909bf5fc093SJosef Bacik slot_count++; 3910bf5fc093SJosef Bacik } 3911bf5fc093SJosef Bacik up_read(&info->groups_sem); 3912bf5fc093SJosef Bacik } 3913bf5fc093SJosef Bacik 391436523e95SDavid Sterba /* 391536523e95SDavid Sterba * Global block reserve, exported as a space_info 391636523e95SDavid Sterba */ 391736523e95SDavid Sterba slot_count++; 391836523e95SDavid Sterba 39197fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39207fde62bfSChris Mason if (space_args.space_slots == 0) { 39217fde62bfSChris Mason space_args.total_spaces = slot_count; 39227fde62bfSChris Mason goto out; 39237fde62bfSChris Mason } 3924bf5fc093SJosef Bacik 392551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3926bf5fc093SJosef Bacik 39277fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3928bf5fc093SJosef Bacik 39297fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39307fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39317fde62bfSChris Mason */ 39327fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 39337fde62bfSChris Mason return -ENOMEM; 39347fde62bfSChris Mason 39357fde62bfSChris Mason space_args.total_spaces = 0; 39367fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 39377fde62bfSChris Mason if (!dest) 39387fde62bfSChris Mason return -ENOMEM; 39397fde62bfSChris Mason dest_orig = dest; 39407fde62bfSChris Mason 39417fde62bfSChris Mason /* now we have a buffer to copy into */ 3942bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3943bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3944bf5fc093SJosef Bacik 394551788b1bSDan Rosenberg if (!slot_count) 394651788b1bSDan Rosenberg break; 394751788b1bSDan Rosenberg 3948bf5fc093SJosef Bacik info = NULL; 39491406e432SJosef Bacik rcu_read_lock(); 3950bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3951bf5fc093SJosef Bacik list) { 3952bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3953bf5fc093SJosef Bacik info = tmp; 39547fde62bfSChris Mason break; 3955bf5fc093SJosef Bacik } 3956bf5fc093SJosef Bacik } 3957bf5fc093SJosef Bacik rcu_read_unlock(); 39587fde62bfSChris Mason 3959bf5fc093SJosef Bacik if (!info) 3960bf5fc093SJosef Bacik continue; 3961bf5fc093SJosef Bacik down_read(&info->groups_sem); 3962bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3963bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 39645af3e8ccSStefan Behrens btrfs_get_block_group_info( 39655af3e8ccSStefan Behrens &info->block_groups[c], &space); 39667fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39671406e432SJosef Bacik dest++; 39681406e432SJosef Bacik space_args.total_spaces++; 396951788b1bSDan Rosenberg slot_count--; 39701406e432SJosef Bacik } 397151788b1bSDan Rosenberg if (!slot_count) 397251788b1bSDan Rosenberg break; 3973bf5fc093SJosef Bacik } 3974bf5fc093SJosef Bacik up_read(&info->groups_sem); 3975bf5fc093SJosef Bacik } 39761406e432SJosef Bacik 397736523e95SDavid Sterba /* 397836523e95SDavid Sterba * Add global block reserve 397936523e95SDavid Sterba */ 398036523e95SDavid Sterba if (slot_count) { 398136523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 398236523e95SDavid Sterba 398336523e95SDavid Sterba spin_lock(&block_rsv->lock); 398436523e95SDavid Sterba space.total_bytes = block_rsv->size; 398536523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 398636523e95SDavid Sterba spin_unlock(&block_rsv->lock); 398736523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 398836523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 398936523e95SDavid Sterba space_args.total_spaces++; 399036523e95SDavid Sterba } 399136523e95SDavid Sterba 39922eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39937fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39947fde62bfSChris Mason 39957fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39967fde62bfSChris Mason ret = -EFAULT; 39977fde62bfSChris Mason 39987fde62bfSChris Mason kfree(dest_orig); 39997fde62bfSChris Mason out: 40007fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 40011406e432SJosef Bacik ret = -EFAULT; 40021406e432SJosef Bacik 40031406e432SJosef Bacik return ret; 40041406e432SJosef Bacik } 40051406e432SJosef Bacik 4006f46b5a66SChristoph Hellwig /* 4007f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4008f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4009f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4010f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4011f46b5a66SChristoph Hellwig */ 4012f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4013f46b5a66SChristoph Hellwig { 4014496ad9aaSAl Viro struct inode *inode = file_inode(file); 4015f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4016f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4017f46b5a66SChristoph Hellwig 4018f46b5a66SChristoph Hellwig trans = file->private_data; 40191ab86aedSSage Weil if (!trans) 40201ab86aedSSage Weil return -EINVAL; 4021b214107eSChristoph Hellwig file->private_data = NULL; 40229ca9ee09SSage Weil 40231ab86aedSSage Weil btrfs_end_transaction(trans, root); 40241ab86aedSSage Weil 4025a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 40269ca9ee09SSage Weil 40272a79f17eSAl Viro mnt_drop_write_file(file); 40281ab86aedSSage Weil return 0; 4029f46b5a66SChristoph Hellwig } 4030f46b5a66SChristoph Hellwig 40319a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40329a8c28beSMiao Xie void __user *argp) 403346204592SSage Weil { 403446204592SSage Weil struct btrfs_trans_handle *trans; 403546204592SSage Weil u64 transid; 4036db5b493aSTsutomu Itoh int ret; 403746204592SSage Weil 4038d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4039ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4040ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 404198d5dc13STsutomu Itoh return PTR_ERR(trans); 4042ff7c1d33SMiao Xie 4043ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4044ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4045ff7c1d33SMiao Xie goto out; 4046ff7c1d33SMiao Xie } 404746204592SSage Weil transid = trans->transid; 4048db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 40498b2b2d3cSTsutomu Itoh if (ret) { 40508b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4051db5b493aSTsutomu Itoh return ret; 40528b2b2d3cSTsutomu Itoh } 4053ff7c1d33SMiao Xie out: 405446204592SSage Weil if (argp) 405546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 405646204592SSage Weil return -EFAULT; 405746204592SSage Weil return 0; 405846204592SSage Weil } 405946204592SSage Weil 40609a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 40619a8c28beSMiao Xie void __user *argp) 406246204592SSage Weil { 406346204592SSage Weil u64 transid; 406446204592SSage Weil 406546204592SSage Weil if (argp) { 406646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 406746204592SSage Weil return -EFAULT; 406846204592SSage Weil } else { 406946204592SSage Weil transid = 0; /* current trans */ 407046204592SSage Weil } 407146204592SSage Weil return btrfs_wait_for_commit(root, transid); 407246204592SSage Weil } 407346204592SSage Weil 4074b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4075475f6387SJan Schmidt { 4076496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4077475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4078b8e95489SMiao Xie int ret; 4079475f6387SJan Schmidt 4080475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4081475f6387SJan Schmidt return -EPERM; 4082475f6387SJan Schmidt 4083475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4084475f6387SJan Schmidt if (IS_ERR(sa)) 4085475f6387SJan Schmidt return PTR_ERR(sa); 4086475f6387SJan Schmidt 4087b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4088b8e95489SMiao Xie ret = mnt_want_write_file(file); 4089b8e95489SMiao Xie if (ret) 4090b8e95489SMiao Xie goto out; 4091b8e95489SMiao Xie } 4092b8e95489SMiao Xie 4093aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 409463a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 409563a212abSStefan Behrens 0); 4096475f6387SJan Schmidt 4097475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4098475f6387SJan Schmidt ret = -EFAULT; 4099475f6387SJan Schmidt 4100b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4101b8e95489SMiao Xie mnt_drop_write_file(file); 4102b8e95489SMiao Xie out: 4103475f6387SJan Schmidt kfree(sa); 4104475f6387SJan Schmidt return ret; 4105475f6387SJan Schmidt } 4106475f6387SJan Schmidt 4107475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4108475f6387SJan Schmidt { 4109475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4110475f6387SJan Schmidt return -EPERM; 4111475f6387SJan Schmidt 4112aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4113475f6387SJan Schmidt } 4114475f6387SJan Schmidt 4115475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4116475f6387SJan Schmidt void __user *arg) 4117475f6387SJan Schmidt { 4118475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4119475f6387SJan Schmidt int ret; 4120475f6387SJan Schmidt 4121475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4122475f6387SJan Schmidt return -EPERM; 4123475f6387SJan Schmidt 4124475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4125475f6387SJan Schmidt if (IS_ERR(sa)) 4126475f6387SJan Schmidt return PTR_ERR(sa); 4127475f6387SJan Schmidt 4128475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4129475f6387SJan Schmidt 4130475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4131475f6387SJan Schmidt ret = -EFAULT; 4132475f6387SJan Schmidt 4133475f6387SJan Schmidt kfree(sa); 4134475f6387SJan Schmidt return ret; 4135475f6387SJan Schmidt } 4136475f6387SJan Schmidt 4137c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4138b27f7c0cSDavid Sterba void __user *arg) 4139c11d2c23SStefan Behrens { 4140c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4141c11d2c23SStefan Behrens int ret; 4142c11d2c23SStefan Behrens 4143c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4144c11d2c23SStefan Behrens if (IS_ERR(sa)) 4145c11d2c23SStefan Behrens return PTR_ERR(sa); 4146c11d2c23SStefan Behrens 4147b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4148b27f7c0cSDavid Sterba kfree(sa); 4149b27f7c0cSDavid Sterba return -EPERM; 4150b27f7c0cSDavid Sterba } 4151b27f7c0cSDavid Sterba 4152b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4153c11d2c23SStefan Behrens 4154c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4155c11d2c23SStefan Behrens ret = -EFAULT; 4156c11d2c23SStefan Behrens 4157c11d2c23SStefan Behrens kfree(sa); 4158c11d2c23SStefan Behrens return ret; 4159c11d2c23SStefan Behrens } 4160c11d2c23SStefan Behrens 41613f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 41623f6bcfbdSStefan Behrens { 41633f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41643f6bcfbdSStefan Behrens int ret; 41653f6bcfbdSStefan Behrens 41663f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41673f6bcfbdSStefan Behrens return -EPERM; 41683f6bcfbdSStefan Behrens 41693f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41703f6bcfbdSStefan Behrens if (IS_ERR(p)) 41713f6bcfbdSStefan Behrens return PTR_ERR(p); 41723f6bcfbdSStefan Behrens 41733f6bcfbdSStefan Behrens switch (p->cmd) { 41743f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4175adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4176adfa97cbSIlya Dryomov ret = -EROFS; 4177adfa97cbSIlya Dryomov goto out; 4178adfa97cbSIlya Dryomov } 41793f6bcfbdSStefan Behrens if (atomic_xchg( 41803f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41813f6bcfbdSStefan Behrens 1)) { 4182e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41833f6bcfbdSStefan Behrens } else { 41843f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 41853f6bcfbdSStefan Behrens atomic_set( 41863f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41873f6bcfbdSStefan Behrens 0); 41883f6bcfbdSStefan Behrens } 41893f6bcfbdSStefan Behrens break; 41903f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41913f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 41923f6bcfbdSStefan Behrens ret = 0; 41933f6bcfbdSStefan Behrens break; 41943f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 41953f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 41963f6bcfbdSStefan Behrens break; 41973f6bcfbdSStefan Behrens default: 41983f6bcfbdSStefan Behrens ret = -EINVAL; 41993f6bcfbdSStefan Behrens break; 42003f6bcfbdSStefan Behrens } 42013f6bcfbdSStefan Behrens 42023f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 42033f6bcfbdSStefan Behrens ret = -EFAULT; 4204adfa97cbSIlya Dryomov out: 42053f6bcfbdSStefan Behrens kfree(p); 42063f6bcfbdSStefan Behrens return ret; 42073f6bcfbdSStefan Behrens } 42083f6bcfbdSStefan Behrens 4209d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4210d7728c96SJan Schmidt { 4211d7728c96SJan Schmidt int ret = 0; 4212d7728c96SJan Schmidt int i; 4213740c3d22SChris Mason u64 rel_ptr; 4214d7728c96SJan Schmidt int size; 4215806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4216d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4217d7728c96SJan Schmidt struct btrfs_path *path; 4218d7728c96SJan Schmidt 421982b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4220d7728c96SJan Schmidt return -EPERM; 4221d7728c96SJan Schmidt 4222d7728c96SJan Schmidt path = btrfs_alloc_path(); 4223d7728c96SJan Schmidt if (!path) { 4224d7728c96SJan Schmidt ret = -ENOMEM; 4225d7728c96SJan Schmidt goto out; 4226d7728c96SJan Schmidt } 4227d7728c96SJan Schmidt 4228d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4229d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4230d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4231d7728c96SJan Schmidt ipa = NULL; 4232d7728c96SJan Schmidt goto out; 4233d7728c96SJan Schmidt } 4234d7728c96SJan Schmidt 4235d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4236d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4237d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4238d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4239d7728c96SJan Schmidt ipath = NULL; 4240d7728c96SJan Schmidt goto out; 4241d7728c96SJan Schmidt } 4242d7728c96SJan Schmidt 4243d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4244d7728c96SJan Schmidt if (ret < 0) 4245d7728c96SJan Schmidt goto out; 4246d7728c96SJan Schmidt 4247d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4248745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4249745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4250740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4251d7728c96SJan Schmidt } 4252d7728c96SJan Schmidt 4253745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4254745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4255d7728c96SJan Schmidt if (ret) { 4256d7728c96SJan Schmidt ret = -EFAULT; 4257d7728c96SJan Schmidt goto out; 4258d7728c96SJan Schmidt } 4259d7728c96SJan Schmidt 4260d7728c96SJan Schmidt out: 4261d7728c96SJan Schmidt btrfs_free_path(path); 4262d7728c96SJan Schmidt free_ipath(ipath); 4263d7728c96SJan Schmidt kfree(ipa); 4264d7728c96SJan Schmidt 4265d7728c96SJan Schmidt return ret; 4266d7728c96SJan Schmidt } 4267d7728c96SJan Schmidt 4268d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4269d7728c96SJan Schmidt { 4270d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4271d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4272d7728c96SJan Schmidt 4273d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4274d7728c96SJan Schmidt inodes->bytes_left -= c; 4275d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4276d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4277d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4278d7728c96SJan Schmidt inodes->elem_cnt += 3; 4279d7728c96SJan Schmidt } else { 4280d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4281d7728c96SJan Schmidt inodes->bytes_left = 0; 4282d7728c96SJan Schmidt inodes->elem_missed += 3; 4283d7728c96SJan Schmidt } 4284d7728c96SJan Schmidt 4285d7728c96SJan Schmidt return 0; 4286d7728c96SJan Schmidt } 4287d7728c96SJan Schmidt 4288d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4289d7728c96SJan Schmidt void __user *arg) 4290d7728c96SJan Schmidt { 4291d7728c96SJan Schmidt int ret = 0; 4292d7728c96SJan Schmidt int size; 4293d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4294d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4295d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4296d7728c96SJan Schmidt 4297d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4298d7728c96SJan Schmidt return -EPERM; 4299d7728c96SJan Schmidt 4300d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4301d7728c96SJan Schmidt if (IS_ERR(loi)) { 4302d7728c96SJan Schmidt ret = PTR_ERR(loi); 4303d7728c96SJan Schmidt loi = NULL; 4304d7728c96SJan Schmidt goto out; 4305d7728c96SJan Schmidt } 4306d7728c96SJan Schmidt 4307d7728c96SJan Schmidt path = btrfs_alloc_path(); 4308d7728c96SJan Schmidt if (!path) { 4309d7728c96SJan Schmidt ret = -ENOMEM; 4310d7728c96SJan Schmidt goto out; 4311d7728c96SJan Schmidt } 4312d7728c96SJan Schmidt 4313425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4314d7728c96SJan Schmidt inodes = init_data_container(size); 4315d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4316d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4317d7728c96SJan Schmidt inodes = NULL; 4318d7728c96SJan Schmidt goto out; 4319d7728c96SJan Schmidt } 4320d7728c96SJan Schmidt 4321df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4322df031f07SLiu Bo build_ino_list, inodes); 4323df031f07SLiu Bo if (ret == -EINVAL) 4324d7728c96SJan Schmidt ret = -ENOENT; 4325d7728c96SJan Schmidt if (ret < 0) 4326d7728c96SJan Schmidt goto out; 4327d7728c96SJan Schmidt 4328745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4329745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4330d7728c96SJan Schmidt if (ret) 4331d7728c96SJan Schmidt ret = -EFAULT; 4332d7728c96SJan Schmidt 4333d7728c96SJan Schmidt out: 4334d7728c96SJan Schmidt btrfs_free_path(path); 4335425d17a2SLiu Bo vfree(inodes); 4336d7728c96SJan Schmidt kfree(loi); 4337d7728c96SJan Schmidt 4338d7728c96SJan Schmidt return ret; 4339d7728c96SJan Schmidt } 4340d7728c96SJan Schmidt 434119a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4342c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4343c9e9f97bSIlya Dryomov { 4344c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4345c9e9f97bSIlya Dryomov 4346c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4347c9e9f97bSIlya Dryomov 4348837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4349837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4350837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4351837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4352a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4353a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4354837d5b6eSIlya Dryomov 4355c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4356c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4357c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 435819a39dceSIlya Dryomov 435919a39dceSIlya Dryomov if (lock) { 436019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 436119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 436219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 436319a39dceSIlya Dryomov } else { 436419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 436519a39dceSIlya Dryomov } 4366c9e9f97bSIlya Dryomov } 4367c9e9f97bSIlya Dryomov 43689ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4369c9e9f97bSIlya Dryomov { 4370496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4371c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4372c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4373c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4374ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4375c9e9f97bSIlya Dryomov int ret; 4376c9e9f97bSIlya Dryomov 4377c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4378c9e9f97bSIlya Dryomov return -EPERM; 4379c9e9f97bSIlya Dryomov 4380e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43819ba1f6e4SLiu Bo if (ret) 43829ba1f6e4SLiu Bo return ret; 43839ba1f6e4SLiu Bo 4384ed0fb78fSIlya Dryomov again: 4385ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4386c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4387c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4388ed0fb78fSIlya Dryomov need_unlock = true; 4389ed0fb78fSIlya Dryomov goto locked; 4390ed0fb78fSIlya Dryomov } 4391ed0fb78fSIlya Dryomov 4392ed0fb78fSIlya Dryomov /* 4393ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4394ed0fb78fSIlya Dryomov * (1) some other op is running 4395ed0fb78fSIlya Dryomov * (2) balance is running 4396ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4397ed0fb78fSIlya Dryomov */ 4398ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4399ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4400ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4401ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4402ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4403ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4404ed0fb78fSIlya Dryomov goto again; 4405ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4406ed0fb78fSIlya Dryomov 4407ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4408ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4409ed0fb78fSIlya Dryomov /* this is (3) */ 4410ed0fb78fSIlya Dryomov need_unlock = false; 4411ed0fb78fSIlya Dryomov goto locked; 4412ed0fb78fSIlya Dryomov } 4413ed0fb78fSIlya Dryomov 4414ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4415ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4416ed0fb78fSIlya Dryomov goto again; 4417ed0fb78fSIlya Dryomov } else { 4418ed0fb78fSIlya Dryomov /* this is (2) */ 4419ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4420ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4421ed0fb78fSIlya Dryomov goto out; 4422ed0fb78fSIlya Dryomov } 4423ed0fb78fSIlya Dryomov } else { 4424ed0fb78fSIlya Dryomov /* this is (1) */ 4425ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4426e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4427ed0fb78fSIlya Dryomov goto out; 4428ed0fb78fSIlya Dryomov } 4429ed0fb78fSIlya Dryomov 4430ed0fb78fSIlya Dryomov locked: 4431ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4432c9e9f97bSIlya Dryomov 4433c9e9f97bSIlya Dryomov if (arg) { 4434c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4435c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4436c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4437ed0fb78fSIlya Dryomov goto out_unlock; 4438c9e9f97bSIlya Dryomov } 4439de322263SIlya Dryomov 4440de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4441de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4442de322263SIlya Dryomov ret = -ENOTCONN; 4443de322263SIlya Dryomov goto out_bargs; 4444de322263SIlya Dryomov } 4445de322263SIlya Dryomov 4446de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4447de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4448de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4449de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4450de322263SIlya Dryomov 4451de322263SIlya Dryomov goto do_balance; 4452de322263SIlya Dryomov } 4453c9e9f97bSIlya Dryomov } else { 4454c9e9f97bSIlya Dryomov bargs = NULL; 4455c9e9f97bSIlya Dryomov } 4456c9e9f97bSIlya Dryomov 4457ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4458837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4459837d5b6eSIlya Dryomov goto out_bargs; 4460837d5b6eSIlya Dryomov } 4461837d5b6eSIlya Dryomov 4462c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4463c9e9f97bSIlya Dryomov if (!bctl) { 4464c9e9f97bSIlya Dryomov ret = -ENOMEM; 4465c9e9f97bSIlya Dryomov goto out_bargs; 4466c9e9f97bSIlya Dryomov } 4467c9e9f97bSIlya Dryomov 4468c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4469c9e9f97bSIlya Dryomov if (arg) { 4470c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4471c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4472c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4473c9e9f97bSIlya Dryomov 4474c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4475f43ffb60SIlya Dryomov } else { 4476f43ffb60SIlya Dryomov /* balance everything - no filters */ 4477f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4478c9e9f97bSIlya Dryomov } 4479c9e9f97bSIlya Dryomov 4480de322263SIlya Dryomov do_balance: 4481c9e9f97bSIlya Dryomov /* 4482ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4483ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4484ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4485ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4486ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4487c9e9f97bSIlya Dryomov */ 4488ed0fb78fSIlya Dryomov need_unlock = false; 4489ed0fb78fSIlya Dryomov 4490ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4491ed0fb78fSIlya Dryomov 4492c9e9f97bSIlya Dryomov if (arg) { 4493c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4494c9e9f97bSIlya Dryomov ret = -EFAULT; 4495c9e9f97bSIlya Dryomov } 4496c9e9f97bSIlya Dryomov 4497c9e9f97bSIlya Dryomov out_bargs: 4498c9e9f97bSIlya Dryomov kfree(bargs); 4499ed0fb78fSIlya Dryomov out_unlock: 4500c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4501c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4502ed0fb78fSIlya Dryomov if (need_unlock) 4503ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4504ed0fb78fSIlya Dryomov out: 4505e54bfa31SLiu Bo mnt_drop_write_file(file); 4506c9e9f97bSIlya Dryomov return ret; 4507c9e9f97bSIlya Dryomov } 4508c9e9f97bSIlya Dryomov 4509837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4510837d5b6eSIlya Dryomov { 4511837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4512837d5b6eSIlya Dryomov return -EPERM; 4513837d5b6eSIlya Dryomov 4514837d5b6eSIlya Dryomov switch (cmd) { 4515837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4516837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4517a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4518a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4519837d5b6eSIlya Dryomov } 4520837d5b6eSIlya Dryomov 4521837d5b6eSIlya Dryomov return -EINVAL; 4522837d5b6eSIlya Dryomov } 4523837d5b6eSIlya Dryomov 452419a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 452519a39dceSIlya Dryomov void __user *arg) 452619a39dceSIlya Dryomov { 452719a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 452819a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 452919a39dceSIlya Dryomov int ret = 0; 453019a39dceSIlya Dryomov 453119a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 453219a39dceSIlya Dryomov return -EPERM; 453319a39dceSIlya Dryomov 453419a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 453519a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 453619a39dceSIlya Dryomov ret = -ENOTCONN; 453719a39dceSIlya Dryomov goto out; 453819a39dceSIlya Dryomov } 453919a39dceSIlya Dryomov 454019a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 454119a39dceSIlya Dryomov if (!bargs) { 454219a39dceSIlya Dryomov ret = -ENOMEM; 454319a39dceSIlya Dryomov goto out; 454419a39dceSIlya Dryomov } 454519a39dceSIlya Dryomov 454619a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 454719a39dceSIlya Dryomov 454819a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 454919a39dceSIlya Dryomov ret = -EFAULT; 455019a39dceSIlya Dryomov 455119a39dceSIlya Dryomov kfree(bargs); 455219a39dceSIlya Dryomov out: 455319a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 455419a39dceSIlya Dryomov return ret; 455519a39dceSIlya Dryomov } 455619a39dceSIlya Dryomov 4557905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45585d13a37bSArne Jansen { 4559496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45605d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45615d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 45625d13a37bSArne Jansen int ret; 45635d13a37bSArne Jansen int err; 45645d13a37bSArne Jansen 45655d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45665d13a37bSArne Jansen return -EPERM; 45675d13a37bSArne Jansen 4568905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4569905b0ddaSMiao Xie if (ret) 4570905b0ddaSMiao Xie return ret; 45715d13a37bSArne Jansen 45725d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4573905b0ddaSMiao Xie if (IS_ERR(sa)) { 4574905b0ddaSMiao Xie ret = PTR_ERR(sa); 4575905b0ddaSMiao Xie goto drop_write; 4576905b0ddaSMiao Xie } 45775d13a37bSArne Jansen 45787708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 457992f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 45805d13a37bSArne Jansen if (IS_ERR(trans)) { 45815d13a37bSArne Jansen ret = PTR_ERR(trans); 45825d13a37bSArne Jansen goto out; 45835d13a37bSArne Jansen } 45845d13a37bSArne Jansen 45855d13a37bSArne Jansen switch (sa->cmd) { 45865d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 45875d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 45885d13a37bSArne Jansen break; 45895d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 45905d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 45915d13a37bSArne Jansen break; 45925d13a37bSArne Jansen default: 45935d13a37bSArne Jansen ret = -EINVAL; 45945d13a37bSArne Jansen break; 45955d13a37bSArne Jansen } 45965d13a37bSArne Jansen 459792f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 45985d13a37bSArne Jansen if (err && !ret) 45995d13a37bSArne Jansen ret = err; 46005d13a37bSArne Jansen out: 46015d13a37bSArne Jansen kfree(sa); 46027708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4603905b0ddaSMiao Xie drop_write: 4604905b0ddaSMiao Xie mnt_drop_write_file(file); 46055d13a37bSArne Jansen return ret; 46065d13a37bSArne Jansen } 46075d13a37bSArne Jansen 4608905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 46095d13a37bSArne Jansen { 4610496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46115d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 46125d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46135d13a37bSArne Jansen int ret; 46145d13a37bSArne Jansen int err; 46155d13a37bSArne Jansen 46165d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46175d13a37bSArne Jansen return -EPERM; 46185d13a37bSArne Jansen 4619905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4620905b0ddaSMiao Xie if (ret) 4621905b0ddaSMiao Xie return ret; 46225d13a37bSArne Jansen 46235d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4624905b0ddaSMiao Xie if (IS_ERR(sa)) { 4625905b0ddaSMiao Xie ret = PTR_ERR(sa); 4626905b0ddaSMiao Xie goto drop_write; 4627905b0ddaSMiao Xie } 46285d13a37bSArne Jansen 46295d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46305d13a37bSArne Jansen if (IS_ERR(trans)) { 46315d13a37bSArne Jansen ret = PTR_ERR(trans); 46325d13a37bSArne Jansen goto out; 46335d13a37bSArne Jansen } 46345d13a37bSArne Jansen 46355d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46365d13a37bSArne Jansen if (sa->assign) { 46375d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 46385d13a37bSArne Jansen sa->src, sa->dst); 46395d13a37bSArne Jansen } else { 46405d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 46415d13a37bSArne Jansen sa->src, sa->dst); 46425d13a37bSArne Jansen } 46435d13a37bSArne Jansen 4644e082f563SQu Wenruo /* update qgroup status and info */ 4645e082f563SQu Wenruo err = btrfs_run_qgroups(trans, root->fs_info); 4646e082f563SQu Wenruo if (err < 0) 4647e082f563SQu Wenruo btrfs_error(root->fs_info, ret, 4648e082f563SQu Wenruo "failed to update qgroup status and info\n"); 46495d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46505d13a37bSArne Jansen if (err && !ret) 46515d13a37bSArne Jansen ret = err; 46525d13a37bSArne Jansen 46535d13a37bSArne Jansen out: 46545d13a37bSArne Jansen kfree(sa); 4655905b0ddaSMiao Xie drop_write: 4656905b0ddaSMiao Xie mnt_drop_write_file(file); 46575d13a37bSArne Jansen return ret; 46585d13a37bSArne Jansen } 46595d13a37bSArne Jansen 4660905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46615d13a37bSArne Jansen { 4662496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46635d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46645d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46655d13a37bSArne Jansen int ret; 46665d13a37bSArne Jansen int err; 46675d13a37bSArne Jansen 46685d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46695d13a37bSArne Jansen return -EPERM; 46705d13a37bSArne Jansen 4671905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4672905b0ddaSMiao Xie if (ret) 4673905b0ddaSMiao Xie return ret; 46745d13a37bSArne Jansen 46755d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4676905b0ddaSMiao Xie if (IS_ERR(sa)) { 4677905b0ddaSMiao Xie ret = PTR_ERR(sa); 4678905b0ddaSMiao Xie goto drop_write; 4679905b0ddaSMiao Xie } 46805d13a37bSArne Jansen 4681d86e56cfSMiao Xie if (!sa->qgroupid) { 4682d86e56cfSMiao Xie ret = -EINVAL; 4683d86e56cfSMiao Xie goto out; 4684d86e56cfSMiao Xie } 4685d86e56cfSMiao Xie 46865d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46875d13a37bSArne Jansen if (IS_ERR(trans)) { 46885d13a37bSArne Jansen ret = PTR_ERR(trans); 46895d13a37bSArne Jansen goto out; 46905d13a37bSArne Jansen } 46915d13a37bSArne Jansen 46925d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46935d13a37bSArne Jansen if (sa->create) { 46944087cf24SDongsheng Yang ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); 46955d13a37bSArne Jansen } else { 46965d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 46975d13a37bSArne Jansen } 46985d13a37bSArne Jansen 46995d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47005d13a37bSArne Jansen if (err && !ret) 47015d13a37bSArne Jansen ret = err; 47025d13a37bSArne Jansen 47035d13a37bSArne Jansen out: 47045d13a37bSArne Jansen kfree(sa); 4705905b0ddaSMiao Xie drop_write: 4706905b0ddaSMiao Xie mnt_drop_write_file(file); 47075d13a37bSArne Jansen return ret; 47085d13a37bSArne Jansen } 47095d13a37bSArne Jansen 4710905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 47115d13a37bSArne Jansen { 4712496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47135d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 47145d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47155d13a37bSArne Jansen int ret; 47165d13a37bSArne Jansen int err; 47175d13a37bSArne Jansen u64 qgroupid; 47185d13a37bSArne Jansen 47195d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47205d13a37bSArne Jansen return -EPERM; 47215d13a37bSArne Jansen 4722905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4723905b0ddaSMiao Xie if (ret) 4724905b0ddaSMiao Xie return ret; 47255d13a37bSArne Jansen 47265d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4727905b0ddaSMiao Xie if (IS_ERR(sa)) { 4728905b0ddaSMiao Xie ret = PTR_ERR(sa); 4729905b0ddaSMiao Xie goto drop_write; 4730905b0ddaSMiao Xie } 47315d13a37bSArne Jansen 47325d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47335d13a37bSArne Jansen if (IS_ERR(trans)) { 47345d13a37bSArne Jansen ret = PTR_ERR(trans); 47355d13a37bSArne Jansen goto out; 47365d13a37bSArne Jansen } 47375d13a37bSArne Jansen 47385d13a37bSArne Jansen qgroupid = sa->qgroupid; 47395d13a37bSArne Jansen if (!qgroupid) { 47405d13a37bSArne Jansen /* take the current subvol as qgroup */ 47415d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47425d13a37bSArne Jansen } 47435d13a37bSArne Jansen 47445d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 47455d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 47465d13a37bSArne Jansen 47475d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47485d13a37bSArne Jansen if (err && !ret) 47495d13a37bSArne Jansen ret = err; 47505d13a37bSArne Jansen 47515d13a37bSArne Jansen out: 47525d13a37bSArne Jansen kfree(sa); 4753905b0ddaSMiao Xie drop_write: 4754905b0ddaSMiao Xie mnt_drop_write_file(file); 47555d13a37bSArne Jansen return ret; 47565d13a37bSArne Jansen } 47575d13a37bSArne Jansen 47582f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47592f232036SJan Schmidt { 47606d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47612f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47622f232036SJan Schmidt int ret; 47632f232036SJan Schmidt 47642f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47652f232036SJan Schmidt return -EPERM; 47662f232036SJan Schmidt 47672f232036SJan Schmidt ret = mnt_want_write_file(file); 47682f232036SJan Schmidt if (ret) 47692f232036SJan Schmidt return ret; 47702f232036SJan Schmidt 47712f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47722f232036SJan Schmidt if (IS_ERR(qsa)) { 47732f232036SJan Schmidt ret = PTR_ERR(qsa); 47742f232036SJan Schmidt goto drop_write; 47752f232036SJan Schmidt } 47762f232036SJan Schmidt 47772f232036SJan Schmidt if (qsa->flags) { 47782f232036SJan Schmidt ret = -EINVAL; 47792f232036SJan Schmidt goto out; 47802f232036SJan Schmidt } 47812f232036SJan Schmidt 47822f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 47832f232036SJan Schmidt 47842f232036SJan Schmidt out: 47852f232036SJan Schmidt kfree(qsa); 47862f232036SJan Schmidt drop_write: 47872f232036SJan Schmidt mnt_drop_write_file(file); 47882f232036SJan Schmidt return ret; 47892f232036SJan Schmidt } 47902f232036SJan Schmidt 47912f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 47922f232036SJan Schmidt { 47936d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47942f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47952f232036SJan Schmidt int ret = 0; 47962f232036SJan Schmidt 47972f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47982f232036SJan Schmidt return -EPERM; 47992f232036SJan Schmidt 48002f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 48012f232036SJan Schmidt if (!qsa) 48022f232036SJan Schmidt return -ENOMEM; 48032f232036SJan Schmidt 48042f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 48052f232036SJan Schmidt qsa->flags = 1; 48062f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 48072f232036SJan Schmidt } 48082f232036SJan Schmidt 48092f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 48102f232036SJan Schmidt ret = -EFAULT; 48112f232036SJan Schmidt 48122f232036SJan Schmidt kfree(qsa); 48132f232036SJan Schmidt return ret; 48142f232036SJan Schmidt } 48152f232036SJan Schmidt 481657254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 481757254b6eSJan Schmidt { 481854563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 481957254b6eSJan Schmidt 482057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 482157254b6eSJan Schmidt return -EPERM; 482257254b6eSJan Schmidt 482357254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 482457254b6eSJan Schmidt } 482557254b6eSJan Schmidt 4826abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4827abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48288ea05e3aSAlexander Block { 4829496ad9aaSAl Viro struct inode *inode = file_inode(file); 48308ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48318ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48328ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 48338ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 48348ea05e3aSAlexander Block int ret = 0; 4835dd5f9615SStefan Behrens int received_uuid_changed; 48368ea05e3aSAlexander Block 4837bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4838bd60ea0fSDavid Sterba return -EPERM; 4839bd60ea0fSDavid Sterba 48408ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48418ea05e3aSAlexander Block if (ret < 0) 48428ea05e3aSAlexander Block return ret; 48438ea05e3aSAlexander Block 48448ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 48458ea05e3aSAlexander Block 48468ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 48478ea05e3aSAlexander Block ret = -EINVAL; 48488ea05e3aSAlexander Block goto out; 48498ea05e3aSAlexander Block } 48508ea05e3aSAlexander Block 48518ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48528ea05e3aSAlexander Block ret = -EROFS; 48538ea05e3aSAlexander Block goto out; 48548ea05e3aSAlexander Block } 48558ea05e3aSAlexander Block 4856dd5f9615SStefan Behrens /* 4857dd5f9615SStefan Behrens * 1 - root item 4858dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4859dd5f9615SStefan Behrens */ 4860dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48618ea05e3aSAlexander Block if (IS_ERR(trans)) { 48628ea05e3aSAlexander Block ret = PTR_ERR(trans); 48638ea05e3aSAlexander Block trans = NULL; 48648ea05e3aSAlexander Block goto out; 48658ea05e3aSAlexander Block } 48668ea05e3aSAlexander Block 48678ea05e3aSAlexander Block sa->rtransid = trans->transid; 48688ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48698ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48708ea05e3aSAlexander Block 4871dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4872dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4873dd5f9615SStefan Behrens if (received_uuid_changed && 4874dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4875dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4876dd5f9615SStefan Behrens root_item->received_uuid, 4877dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4878dd5f9615SStefan Behrens root->root_key.objectid); 48798ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48808ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48818ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48823cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48833cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48843cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48853cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48868ea05e3aSAlexander Block 48878ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 48888ea05e3aSAlexander Block &root->root_key, &root->root_item); 48898ea05e3aSAlexander Block if (ret < 0) { 48908ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 48918ea05e3aSAlexander Block goto out; 4892dd5f9615SStefan Behrens } 4893dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4894dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4895dd5f9615SStefan Behrens sa->uuid, 4896dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4897dd5f9615SStefan Behrens root->root_key.objectid); 4898dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4899dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4900dd5f9615SStefan Behrens goto out; 4901dd5f9615SStefan Behrens } 4902dd5f9615SStefan Behrens } 49038ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4904dd5f9615SStefan Behrens if (ret < 0) { 4905dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 49068ea05e3aSAlexander Block goto out; 49078ea05e3aSAlexander Block } 49088ea05e3aSAlexander Block 4909abccd00fSHugo Mills out: 4910abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4911abccd00fSHugo Mills mnt_drop_write_file(file); 4912abccd00fSHugo Mills return ret; 4913abccd00fSHugo Mills } 4914abccd00fSHugo Mills 4915abccd00fSHugo Mills #ifdef CONFIG_64BIT 4916abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4917abccd00fSHugo Mills void __user *arg) 4918abccd00fSHugo Mills { 4919abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4920abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4921abccd00fSHugo Mills int ret = 0; 4922abccd00fSHugo Mills 4923abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4924abccd00fSHugo Mills if (IS_ERR(args32)) { 4925abccd00fSHugo Mills ret = PTR_ERR(args32); 4926abccd00fSHugo Mills args32 = NULL; 4927abccd00fSHugo Mills goto out; 4928abccd00fSHugo Mills } 4929abccd00fSHugo Mills 4930abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 493184dbeb87SDan Carpenter if (!args64) { 493284dbeb87SDan Carpenter ret = -ENOMEM; 4933abccd00fSHugo Mills goto out; 4934abccd00fSHugo Mills } 4935abccd00fSHugo Mills 4936abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4937abccd00fSHugo Mills args64->stransid = args32->stransid; 4938abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4939abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4940abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4941abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4942abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4943abccd00fSHugo Mills args64->flags = args32->flags; 4944abccd00fSHugo Mills 4945abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4946abccd00fSHugo Mills if (ret) 4947abccd00fSHugo Mills goto out; 4948abccd00fSHugo Mills 4949abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4950abccd00fSHugo Mills args32->stransid = args64->stransid; 4951abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4952abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4953abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4954abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4955abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4956abccd00fSHugo Mills args32->flags = args64->flags; 4957abccd00fSHugo Mills 4958abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4959abccd00fSHugo Mills if (ret) 4960abccd00fSHugo Mills ret = -EFAULT; 4961abccd00fSHugo Mills 4962abccd00fSHugo Mills out: 4963abccd00fSHugo Mills kfree(args32); 4964abccd00fSHugo Mills kfree(args64); 4965abccd00fSHugo Mills return ret; 4966abccd00fSHugo Mills } 4967abccd00fSHugo Mills #endif 4968abccd00fSHugo Mills 4969abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4970abccd00fSHugo Mills void __user *arg) 4971abccd00fSHugo Mills { 4972abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4973abccd00fSHugo Mills int ret = 0; 4974abccd00fSHugo Mills 4975abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4976abccd00fSHugo Mills if (IS_ERR(sa)) { 4977abccd00fSHugo Mills ret = PTR_ERR(sa); 4978abccd00fSHugo Mills sa = NULL; 4979abccd00fSHugo Mills goto out; 4980abccd00fSHugo Mills } 4981abccd00fSHugo Mills 4982abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4983abccd00fSHugo Mills 4984abccd00fSHugo Mills if (ret) 4985abccd00fSHugo Mills goto out; 4986abccd00fSHugo Mills 49878ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49888ea05e3aSAlexander Block if (ret) 49898ea05e3aSAlexander Block ret = -EFAULT; 49908ea05e3aSAlexander Block 49918ea05e3aSAlexander Block out: 49928ea05e3aSAlexander Block kfree(sa); 49938ea05e3aSAlexander Block return ret; 49948ea05e3aSAlexander Block } 49958ea05e3aSAlexander Block 4996867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4997867ab667Sjeff.liu { 49986d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4999a1b83ac5SAnand Jain size_t len; 5000867ab667Sjeff.liu int ret; 5001a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5002a1b83ac5SAnand Jain 5003a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5004a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 5005a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5006a1b83ac5SAnand Jain 5007a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5008867ab667Sjeff.liu 5009867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 5010efe120a0SFrank Holton btrfs_warn(root->fs_info, 5011efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5012867ab667Sjeff.liu } 5013867ab667Sjeff.liu 5014867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5015867ab667Sjeff.liu 5016867ab667Sjeff.liu return ret ? -EFAULT : 0; 5017867ab667Sjeff.liu } 5018867ab667Sjeff.liu 5019a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5020a8bfd4abSjeff.liu { 50216d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5022a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5023a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5024a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5025a8bfd4abSjeff.liu int ret; 5026a8bfd4abSjeff.liu 5027a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5028a8bfd4abSjeff.liu return -EPERM; 5029a8bfd4abSjeff.liu 5030a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5031a8bfd4abSjeff.liu return -EFAULT; 5032a8bfd4abSjeff.liu 5033a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5034efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5035a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5036a8bfd4abSjeff.liu return -EINVAL; 5037a8bfd4abSjeff.liu } 5038a8bfd4abSjeff.liu 5039a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5040a8bfd4abSjeff.liu if (ret) 5041a8bfd4abSjeff.liu return ret; 5042a8bfd4abSjeff.liu 5043a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5044a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5045a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5046a8bfd4abSjeff.liu goto out_unlock; 5047a8bfd4abSjeff.liu } 5048a8bfd4abSjeff.liu 5049a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5050a8bfd4abSjeff.liu strcpy(super_block->label, label); 5051a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5052d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5053a8bfd4abSjeff.liu 5054a8bfd4abSjeff.liu out_unlock: 5055a8bfd4abSjeff.liu mnt_drop_write_file(file); 5056a8bfd4abSjeff.liu return ret; 5057a8bfd4abSjeff.liu } 5058a8bfd4abSjeff.liu 50592eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50602eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50612eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50622eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50632eaa055fSJeff Mahoney 50642eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 50652eaa055fSJeff Mahoney void __user *arg) 50662eaa055fSJeff Mahoney { 50672eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 50682eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50692eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50702eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50712eaa055fSJeff Mahoney }; 50722eaa055fSJeff Mahoney 50732eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50742eaa055fSJeff Mahoney return -EFAULT; 50752eaa055fSJeff Mahoney 50762eaa055fSJeff Mahoney return 0; 50772eaa055fSJeff Mahoney } 50782eaa055fSJeff Mahoney 50792eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 50802eaa055fSJeff Mahoney { 50812eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 50822eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 50832eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50842eaa055fSJeff Mahoney 50852eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50862eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50872eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50882eaa055fSJeff Mahoney 50892eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50902eaa055fSJeff Mahoney return -EFAULT; 50912eaa055fSJeff Mahoney 50922eaa055fSJeff Mahoney return 0; 50932eaa055fSJeff Mahoney } 50942eaa055fSJeff Mahoney 50953b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 50963b02a68aSJeff Mahoney enum btrfs_feature_set set, 50972eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50982eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50992eaa055fSJeff Mahoney { 51003b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 51013b02a68aSJeff Mahoney char *names; 51022eaa055fSJeff Mahoney u64 disallowed, unsupported; 51032eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 51042eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 51052eaa055fSJeff Mahoney 51062eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 51072eaa055fSJeff Mahoney if (unsupported) { 51083b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 51093b02a68aSJeff Mahoney if (names) { 51103b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51113b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 51123b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51133b02a68aSJeff Mahoney kfree(names); 51143b02a68aSJeff Mahoney } else 51152eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51162eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 51172eaa055fSJeff Mahoney type, unsupported); 51182eaa055fSJeff Mahoney return -EOPNOTSUPP; 51192eaa055fSJeff Mahoney } 51202eaa055fSJeff Mahoney 51212eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51222eaa055fSJeff Mahoney if (disallowed) { 51233b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51243b02a68aSJeff Mahoney if (names) { 51253b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51263b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51273b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51283b02a68aSJeff Mahoney kfree(names); 51293b02a68aSJeff Mahoney } else 51302eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51312eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51322eaa055fSJeff Mahoney type, disallowed); 51332eaa055fSJeff Mahoney return -EPERM; 51342eaa055fSJeff Mahoney } 51352eaa055fSJeff Mahoney 51362eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51372eaa055fSJeff Mahoney if (disallowed) { 51383b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51393b02a68aSJeff Mahoney if (names) { 51403b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51413b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51423b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51433b02a68aSJeff Mahoney kfree(names); 51443b02a68aSJeff Mahoney } else 51452eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51462eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51472eaa055fSJeff Mahoney type, disallowed); 51482eaa055fSJeff Mahoney return -EPERM; 51492eaa055fSJeff Mahoney } 51502eaa055fSJeff Mahoney 51512eaa055fSJeff Mahoney return 0; 51522eaa055fSJeff Mahoney } 51532eaa055fSJeff Mahoney 51542eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 51553b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 51562eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51572eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51582eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51592eaa055fSJeff Mahoney 51602eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51612eaa055fSJeff Mahoney { 51622eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 51632eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 51642eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51652eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51662eaa055fSJeff Mahoney u64 newflags; 51672eaa055fSJeff Mahoney int ret; 51682eaa055fSJeff Mahoney 51692eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51702eaa055fSJeff Mahoney return -EPERM; 51712eaa055fSJeff Mahoney 51722eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51732eaa055fSJeff Mahoney return -EFAULT; 51742eaa055fSJeff Mahoney 51752eaa055fSJeff Mahoney /* Nothing to do */ 51762eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51772eaa055fSJeff Mahoney !flags[0].incompat_flags) 51782eaa055fSJeff Mahoney return 0; 51792eaa055fSJeff Mahoney 51802eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 51812eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51822eaa055fSJeff Mahoney if (ret) 51832eaa055fSJeff Mahoney return ret; 51842eaa055fSJeff Mahoney 51852eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 51862eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51872eaa055fSJeff Mahoney if (ret) 51882eaa055fSJeff Mahoney return ret; 51892eaa055fSJeff Mahoney 51902eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 51912eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51922eaa055fSJeff Mahoney if (ret) 51932eaa055fSJeff Mahoney return ret; 51942eaa055fSJeff Mahoney 51958051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51962eaa055fSJeff Mahoney if (IS_ERR(trans)) 51972eaa055fSJeff Mahoney return PTR_ERR(trans); 51982eaa055fSJeff Mahoney 51992eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 52002eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 52012eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 52022eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 52032eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 52042eaa055fSJeff Mahoney 52052eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 52062eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 52072eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 52082eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 52092eaa055fSJeff Mahoney 52102eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 52112eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 52122eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 52132eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 52142eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 52152eaa055fSJeff Mahoney 5216d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 52172eaa055fSJeff Mahoney } 52182eaa055fSJeff Mahoney 5219f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5220f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5221f46b5a66SChristoph Hellwig { 5222496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52234bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5224f46b5a66SChristoph Hellwig 5225f46b5a66SChristoph Hellwig switch (cmd) { 52266cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 52276cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 52286cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 52296cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 52306cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 52316cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5232f7039b1dSLi Dongyang case FITRIM: 5233f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5234f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5235fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5236fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5237fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 52383de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5239fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 52406f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 52416f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 524276dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 524376dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 52440caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 52450caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 52460caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 52470caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 52486ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 52496ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5250f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 52511e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 52521e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 52531e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5254f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5255198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5256f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 52574bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5258f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5259da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5260475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5261475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5262475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5263475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5264f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 52659ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5266f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 5267c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 5268c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 52697a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 5270f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5271f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5272f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5273f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5274ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5275ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5276cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5277cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5278ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5279ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5280d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5281d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5282d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5283d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 52841406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 52851406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 52869b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 52879b199859SFilipe David Borba Manana int ret; 52889b199859SFilipe David Borba Manana 52896c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 52909b199859SFilipe David Borba Manana if (ret) 52919b199859SFilipe David Borba Manana return ret; 5292ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 52932fad4e83SDavid Sterba /* 52942fad4e83SDavid Sterba * The transaction thread may want to do more work, 52952fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 52962fad4e83SDavid Sterba * processing uncleaned subvols. 52972fad4e83SDavid Sterba */ 52982fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 52999b199859SFilipe David Borba Manana return ret; 53009b199859SFilipe David Borba Manana } 530146204592SSage Weil case BTRFS_IOC_START_SYNC: 53029a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 530346204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 53049a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5305475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5306b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5307475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5308475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5309475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5310475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5311c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 53129ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5313837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5314837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 531519a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 531619a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 53178ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 53188ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5319abccd00fSHugo Mills #ifdef CONFIG_64BIT 5320abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5321abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5322abccd00fSHugo Mills #endif 532331db9f7cSAlexander Block case BTRFS_IOC_SEND: 532431db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5325c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5326b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 53275d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5328905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 53295d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5330905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 53315d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5332905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 53335d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5334905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 53352f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 53362f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 53372f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 53382f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 533957254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 534057254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 53413f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 53423f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5343867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5344867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5345a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5346a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5347416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5348416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 53492eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 53502eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 53512eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 53522eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 53532eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 53542eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5355f46b5a66SChristoph Hellwig } 5356f46b5a66SChristoph Hellwig 5357f46b5a66SChristoph Hellwig return -ENOTTY; 5358f46b5a66SChristoph Hellwig } 5359