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> 464b4e25f2SChris Mason #include "compat.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" 59f46b5a66SChristoph Hellwig 606cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 616cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 626cbff00fSChristoph Hellwig { 636cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 646cbff00fSChristoph Hellwig return flags; 656cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 666cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 676cbff00fSChristoph Hellwig else 686cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 696cbff00fSChristoph Hellwig } 70f46b5a66SChristoph Hellwig 716cbff00fSChristoph Hellwig /* 726cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 736cbff00fSChristoph Hellwig */ 746cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 756cbff00fSChristoph Hellwig { 766cbff00fSChristoph Hellwig unsigned int iflags = 0; 776cbff00fSChristoph Hellwig 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 796cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 816cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 836cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 856cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 866cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 876cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 886cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 896cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 90d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 91d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 92d0092bddSLi Zefan 93d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 94d0092bddSLi Zefan iflags |= FS_COMPR_FL; 95d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 96d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 976cbff00fSChristoph Hellwig 986cbff00fSChristoph Hellwig return iflags; 996cbff00fSChristoph Hellwig } 1006cbff00fSChristoph Hellwig 1016cbff00fSChristoph Hellwig /* 1026cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1036cbff00fSChristoph Hellwig */ 1046cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1056cbff00fSChristoph Hellwig { 1066cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1126cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1166cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1176cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1186cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1196cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1206cbff00fSChristoph Hellwig } 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig /* 1236cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1246cbff00fSChristoph Hellwig * 125e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1266cbff00fSChristoph Hellwig */ 1276cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1286cbff00fSChristoph Hellwig { 1290b4dcea5SChris Mason unsigned int flags; 1300b4dcea5SChris Mason 1310b4dcea5SChris Mason if (!dir) 1320b4dcea5SChris Mason return; 1330b4dcea5SChris Mason 1340b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1356cbff00fSChristoph Hellwig 136e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 137e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 138e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 139e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 140e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 141e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 142e27425d6SJosef Bacik } 1436cbff00fSChristoph Hellwig 144213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 145e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 146213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 147213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 148213490b3SLiu Bo } 149e27425d6SJosef Bacik 1506cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1516cbff00fSChristoph Hellwig } 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1546cbff00fSChristoph Hellwig { 155496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1566cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1596cbff00fSChristoph Hellwig return -EFAULT; 1606cbff00fSChristoph Hellwig return 0; 1616cbff00fSChristoph Hellwig } 1626cbff00fSChristoph Hellwig 16375e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16475e7cb7fSLiu Bo { 16575e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16675e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16775e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 168e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 169e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17075e7cb7fSLiu Bo return -EOPNOTSUPP; 17175e7cb7fSLiu Bo 17275e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17375e7cb7fSLiu Bo return -EINVAL; 17475e7cb7fSLiu Bo 17575e7cb7fSLiu Bo return 0; 17675e7cb7fSLiu Bo } 17775e7cb7fSLiu Bo 1786cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1796cbff00fSChristoph Hellwig { 180496ad9aaSAl Viro struct inode *inode = file_inode(file); 1816cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1826cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1836cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1846cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1856cbff00fSChristoph Hellwig int ret; 186f062abf0SLi Zefan u64 ip_oldflags; 187f062abf0SLi Zefan unsigned int i_oldflags; 1887e97b8daSDavid Sterba umode_t mode; 1896cbff00fSChristoph Hellwig 190b83cc969SLi Zefan if (btrfs_root_readonly(root)) 191b83cc969SLi Zefan return -EROFS; 192b83cc969SLi Zefan 1936cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1946cbff00fSChristoph Hellwig return -EFAULT; 1956cbff00fSChristoph Hellwig 19675e7cb7fSLiu Bo ret = check_flags(flags); 19775e7cb7fSLiu Bo if (ret) 19875e7cb7fSLiu Bo return ret; 1996cbff00fSChristoph Hellwig 2002e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2016cbff00fSChristoph Hellwig return -EACCES; 2026cbff00fSChristoph Hellwig 203e7848683SJan Kara ret = mnt_want_write_file(file); 204e7848683SJan Kara if (ret) 205e7848683SJan Kara return ret; 206e7848683SJan Kara 2076cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2086cbff00fSChristoph Hellwig 209f062abf0SLi Zefan ip_oldflags = ip->flags; 210f062abf0SLi Zefan i_oldflags = inode->i_flags; 2117e97b8daSDavid Sterba mode = inode->i_mode; 212f062abf0SLi Zefan 2136cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2146cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2156cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2166cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2176cbff00fSChristoph Hellwig ret = -EPERM; 2186cbff00fSChristoph Hellwig goto out_unlock; 2196cbff00fSChristoph Hellwig } 2206cbff00fSChristoph Hellwig } 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2236cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2246cbff00fSChristoph Hellwig else 2256cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2266cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2306cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2346cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2386cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2396cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2406cbff00fSChristoph Hellwig else 2416cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2426cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2436cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2446cbff00fSChristoph Hellwig else 2456cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2467e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2477e97b8daSDavid Sterba if (S_ISREG(mode)) { 2487e97b8daSDavid Sterba /* 2497e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2507e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2517e97b8daSDavid Sterba * status of the file and will not set it. 2527e97b8daSDavid Sterba */ 2537e97b8daSDavid Sterba if (inode->i_size == 0) 2547e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2557e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2567e97b8daSDavid Sterba } else { 257e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2587e97b8daSDavid Sterba } 2597e97b8daSDavid Sterba } else { 2607e97b8daSDavid Sterba /* 2617e97b8daSDavid Sterba * Revert back under same assuptions as above 2627e97b8daSDavid Sterba */ 2637e97b8daSDavid Sterba if (S_ISREG(mode)) { 2647e97b8daSDavid Sterba if (inode->i_size == 0) 2657e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2667e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2677e97b8daSDavid Sterba } else { 268e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2697e97b8daSDavid Sterba } 2707e97b8daSDavid Sterba } 2716cbff00fSChristoph Hellwig 27275e7cb7fSLiu Bo /* 27375e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27475e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27575e7cb7fSLiu Bo * things smaller. 27675e7cb7fSLiu Bo */ 27775e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 27875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 27975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 28175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 28275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 283ebcb904dSLi Zefan } else { 284ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28575e7cb7fSLiu Bo } 2866cbff00fSChristoph Hellwig 2874da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 288f062abf0SLi Zefan if (IS_ERR(trans)) { 289f062abf0SLi Zefan ret = PTR_ERR(trans); 290f062abf0SLi Zefan goto out_drop; 291f062abf0SLi Zefan } 2926cbff00fSChristoph Hellwig 293306424ccSLi Zefan btrfs_update_iflags(inode); 2940c4d2d95SJosef Bacik inode_inc_iversion(inode); 295306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2966cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2976cbff00fSChristoph Hellwig 2986cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 299f062abf0SLi Zefan out_drop: 300f062abf0SLi Zefan if (ret) { 301f062abf0SLi Zefan ip->flags = ip_oldflags; 302f062abf0SLi Zefan inode->i_flags = i_oldflags; 303f062abf0SLi Zefan } 3046cbff00fSChristoph Hellwig 3056cbff00fSChristoph Hellwig out_unlock: 3066cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 307e7848683SJan Kara mnt_drop_write_file(file); 3082d4e6f6aSliubo return ret; 3096cbff00fSChristoph Hellwig } 3106cbff00fSChristoph Hellwig 3116cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3126cbff00fSChristoph Hellwig { 313496ad9aaSAl Viro struct inode *inode = file_inode(file); 3146cbff00fSChristoph Hellwig 3156cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3166cbff00fSChristoph Hellwig } 317f46b5a66SChristoph Hellwig 318f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 319f7039b1dSLi Dongyang { 320815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 321f7039b1dSLi Dongyang struct btrfs_device *device; 322f7039b1dSLi Dongyang struct request_queue *q; 323f7039b1dSLi Dongyang struct fstrim_range range; 324f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 325f7039b1dSLi Dongyang u64 num_devices = 0; 326815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 327f7039b1dSLi Dongyang int ret; 328f7039b1dSLi Dongyang 329f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 330f7039b1dSLi Dongyang return -EPERM; 331f7039b1dSLi Dongyang 3321f78160cSXiao Guangrong rcu_read_lock(); 3331f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3341f78160cSXiao Guangrong dev_list) { 335f7039b1dSLi Dongyang if (!device->bdev) 336f7039b1dSLi Dongyang continue; 337f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 338f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 339f7039b1dSLi Dongyang num_devices++; 340f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 341f7039b1dSLi Dongyang minlen); 342f7039b1dSLi Dongyang } 343f7039b1dSLi Dongyang } 3441f78160cSXiao Guangrong rcu_read_unlock(); 345f4c697e6SLukas Czerner 346f7039b1dSLi Dongyang if (!num_devices) 347f7039b1dSLi Dongyang return -EOPNOTSUPP; 348f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 349f7039b1dSLi Dongyang return -EFAULT; 350e515c18bSLukas Czerner if (range.start > total_bytes || 351e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 352f4c697e6SLukas Czerner return -EINVAL; 353f7039b1dSLi Dongyang 354f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 355f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 356815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 357f7039b1dSLi Dongyang if (ret < 0) 358f7039b1dSLi Dongyang return ret; 359f7039b1dSLi Dongyang 360f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 361f7039b1dSLi Dongyang return -EFAULT; 362f7039b1dSLi Dongyang 363f7039b1dSLi Dongyang return 0; 364f7039b1dSLi Dongyang } 365f7039b1dSLi Dongyang 366d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 367cb8e7090SChristoph Hellwig struct dentry *dentry, 36872fd032eSSage Weil char *name, int namelen, 3696f72c7e2SArne Jansen u64 *async_transid, 3708696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 371f46b5a66SChristoph Hellwig { 372f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 373f46b5a66SChristoph Hellwig struct btrfs_key key; 374f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 375f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 376f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 377d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 37876dda93cSYan, Zheng struct btrfs_root *new_root; 379d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3808ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 381f46b5a66SChristoph Hellwig int ret; 382f46b5a66SChristoph Hellwig int err; 383f46b5a66SChristoph Hellwig u64 objectid; 384f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3853de4586cSChris Mason u64 index = 0; 386d5c12070SMiao Xie u64 qgroup_reserved; 3878ea05e3aSAlexander Block uuid_le new_uuid; 388f46b5a66SChristoph Hellwig 389581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3902fbe8c8aSAl Viro if (ret) 391a22285a6SYan, Zheng return ret; 3926a912213SJosef Bacik 393d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 3949ed74f2dSJosef Bacik /* 395d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 396d5c12070SMiao Xie * of create_snapshot(). 3979ed74f2dSJosef Bacik */ 398d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 399d5c12070SMiao Xie 7, &qgroup_reserved); 400d5c12070SMiao Xie if (ret) 401d5c12070SMiao Xie return ret; 402f46b5a66SChristoph Hellwig 403d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 404d5c12070SMiao Xie if (IS_ERR(trans)) { 405d5c12070SMiao Xie ret = PTR_ERR(trans); 406d5c12070SMiao Xie goto out; 407d5c12070SMiao Xie } 408d5c12070SMiao Xie trans->block_rsv = &block_rsv; 409d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 410f46b5a66SChristoph Hellwig 4118696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4126f72c7e2SArne Jansen if (ret) 4136f72c7e2SArne Jansen goto fail; 4146f72c7e2SArne Jansen 4155d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4165581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4178e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4188e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4198e8a1e31SJosef Bacik goto fail; 4208e8a1e31SJosef Bacik } 421f46b5a66SChristoph Hellwig 4225d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 423f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 424f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4255d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 426f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 427f46b5a66SChristoph Hellwig 428f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 429f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 430f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4315d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 4325d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 4335d4f98a2SYan Zheng BTRFS_UUID_SIZE); 434f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 435f46b5a66SChristoph Hellwig 4368ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4378ea05e3aSAlexander Block 438f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 439f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 440f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 441f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 442a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 443f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 444f46b5a66SChristoph Hellwig 44508fe4db1SLi Zefan root_item.flags = 0; 44608fe4db1SLi Zefan root_item.byte_limit = 0; 44708fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 44808fe4db1SLi Zefan 449f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 45084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 451f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 452f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 45386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 45480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 455f46b5a66SChristoph Hellwig 4568ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4578ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4588ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4598ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4608ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 461dadd1105SDan Carpenter root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); 4628ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4638ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4648ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 465f46b5a66SChristoph Hellwig 466925baeddSChris Mason btrfs_tree_unlock(leaf); 467f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 468f46b5a66SChristoph Hellwig leaf = NULL; 469f46b5a66SChristoph Hellwig 470f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 471f46b5a66SChristoph Hellwig 472f46b5a66SChristoph Hellwig key.objectid = objectid; 4735d4f98a2SYan Zheng key.offset = 0; 474f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 475f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 476f46b5a66SChristoph Hellwig &root_item); 477f46b5a66SChristoph Hellwig if (ret) 478f46b5a66SChristoph Hellwig goto fail; 479f46b5a66SChristoph Hellwig 48076dda93cSYan, Zheng key.offset = (u64)-1; 48176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 48279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 48379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 48479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 48579787eaaSJeff Mahoney goto fail; 48679787eaaSJeff Mahoney } 48776dda93cSYan, Zheng 48876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 48976dda93cSYan, Zheng 490d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 491ce598979SMark Fasheh if (ret) { 492ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 49379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 494ce598979SMark Fasheh goto fail; 495ce598979SMark Fasheh } 496ce598979SMark Fasheh 497f46b5a66SChristoph Hellwig /* 498f46b5a66SChristoph Hellwig * insert the directory item 499f46b5a66SChristoph Hellwig */ 5003de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 50179787eaaSJeff Mahoney if (ret) { 50279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 50379787eaaSJeff Mahoney goto fail; 50479787eaaSJeff Mahoney } 5053de4586cSChris Mason 5063de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 50716cdcec7SMiao Xie name, namelen, dir, &key, 5083de4586cSChris Mason BTRFS_FT_DIR, index); 50979787eaaSJeff Mahoney if (ret) { 51079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 511f46b5a66SChristoph Hellwig goto fail; 51279787eaaSJeff Mahoney } 5130660b5afSChris Mason 51452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 51552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 51652c26179SYan Zheng BUG_ON(ret); 51752c26179SYan Zheng 5180660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5194df27c4dSYan, Zheng objectid, root->root_key.objectid, 52033345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 52176dda93cSYan, Zheng 5220660b5afSChris Mason BUG_ON(ret); 5230660b5afSChris Mason 524f46b5a66SChristoph Hellwig fail: 525d5c12070SMiao Xie trans->block_rsv = NULL; 526d5c12070SMiao Xie trans->bytes_reserved = 0; 52772fd032eSSage Weil if (async_transid) { 52872fd032eSSage Weil *async_transid = trans->transid; 52972fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 53000d71c9cSMiao Xie if (err) 53100d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 53272fd032eSSage Weil } else { 53376dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 53472fd032eSSage Weil } 535f46b5a66SChristoph Hellwig if (err && !ret) 536f46b5a66SChristoph Hellwig ret = err; 5371a65e24bSChris Mason 5381a65e24bSChris Mason if (!ret) 5391a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 540d5c12070SMiao Xie out: 541d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 542f46b5a66SChristoph Hellwig return ret; 543f46b5a66SChristoph Hellwig } 544f46b5a66SChristoph Hellwig 545e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 546e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 547e9662f70SMiao Xie u64 *async_transid, bool readonly, 548e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 549f46b5a66SChristoph Hellwig { 5502e4bfab9SYan, Zheng struct inode *inode; 551f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 552f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5532e4bfab9SYan, Zheng int ret; 554f46b5a66SChristoph Hellwig 555f46b5a66SChristoph Hellwig if (!root->ref_cows) 556f46b5a66SChristoph Hellwig return -EINVAL; 557f46b5a66SChristoph Hellwig 558a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 559a22285a6SYan, Zheng if (!pending_snapshot) 560a22285a6SYan, Zheng return -ENOMEM; 561a22285a6SYan, Zheng 56266d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 56366d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 564d5c12070SMiao Xie /* 565d5c12070SMiao Xie * 1 - parent dir inode 566d5c12070SMiao Xie * 2 - dir entries 567d5c12070SMiao Xie * 1 - root item 568d5c12070SMiao Xie * 2 - root ref/backref 569d5c12070SMiao Xie * 1 - root of snapshot 570d5c12070SMiao Xie */ 571d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 572d5c12070SMiao Xie &pending_snapshot->block_rsv, 7, 573d5c12070SMiao Xie &pending_snapshot->qgroup_reserved); 574d5c12070SMiao Xie if (ret) 575d5c12070SMiao Xie goto out; 576d5c12070SMiao Xie 577a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 578a22285a6SYan, Zheng pending_snapshot->root = root; 579b83cc969SLi Zefan pending_snapshot->readonly = readonly; 580e9662f70SMiao Xie pending_snapshot->dir = dir; 5818696c533SMiao Xie pending_snapshot->inherit = inherit; 582a22285a6SYan, Zheng 583d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 584a22285a6SYan, Zheng if (IS_ERR(trans)) { 585a22285a6SYan, Zheng ret = PTR_ERR(trans); 586a22285a6SYan, Zheng goto fail; 587a22285a6SYan, Zheng } 588a22285a6SYan, Zheng 5898351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 590a22285a6SYan, Zheng list_add(&pending_snapshot->list, 591a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5928351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 59372fd032eSSage Weil if (async_transid) { 59472fd032eSSage Weil *async_transid = trans->transid; 59572fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 59672fd032eSSage Weil root->fs_info->extent_root, 1); 59700d71c9cSMiao Xie if (ret) 59800d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 59972fd032eSSage Weil } else { 60072fd032eSSage Weil ret = btrfs_commit_transaction(trans, 60172fd032eSSage Weil root->fs_info->extent_root); 60272fd032eSSage Weil } 603aec8030aSMiao Xie if (ret) 604c37b2b62SJosef Bacik goto fail; 605a22285a6SYan, Zheng 606a22285a6SYan, Zheng ret = pending_snapshot->error; 607f46b5a66SChristoph Hellwig if (ret) 6082e4bfab9SYan, Zheng goto fail; 609f46b5a66SChristoph Hellwig 61066b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 61166b4ffd1SJosef Bacik if (ret) 61266b4ffd1SJosef Bacik goto fail; 613f46b5a66SChristoph Hellwig 6142fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6152e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6162e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6172e4bfab9SYan, Zheng goto fail; 6182e4bfab9SYan, Zheng } 6192e4bfab9SYan, Zheng BUG_ON(!inode); 6202e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6212e4bfab9SYan, Zheng ret = 0; 6222e4bfab9SYan, Zheng fail: 623d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 624d5c12070SMiao Xie &pending_snapshot->block_rsv, 625d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 626d5c12070SMiao Xie out: 627a22285a6SYan, Zheng kfree(pending_snapshot); 628f46b5a66SChristoph Hellwig return ret; 629f46b5a66SChristoph Hellwig } 630f46b5a66SChristoph Hellwig 6314260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6324260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6334260f7c7SSage Weil * minimal. 6344260f7c7SSage Weil */ 6354260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6364260f7c7SSage Weil { 6372f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6384260f7c7SSage Weil 6394260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6404260f7c7SSage Weil return 0; 6412f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6424260f7c7SSage Weil return 0; 6432f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6444260f7c7SSage Weil return 0; 6454260f7c7SSage Weil return !capable(CAP_FOWNER); 6464260f7c7SSage Weil } 6474260f7c7SSage Weil 6484260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6494260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6504260f7c7SSage Weil * whether the type of victim is right. 6514260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6524260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6534260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6544260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6554260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6564260f7c7SSage Weil * a. be owner of dir, or 6574260f7c7SSage Weil * b. be owner of victim, or 6584260f7c7SSage Weil * c. have CAP_FOWNER capability 6594260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6604260f7c7SSage Weil * links pointing to it. 6614260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6624260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6634260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6644260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6654260f7c7SSage Weil * nfs_async_unlink(). 6664260f7c7SSage Weil */ 6674260f7c7SSage Weil 6684260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6694260f7c7SSage Weil { 6704260f7c7SSage Weil int error; 6714260f7c7SSage Weil 6724260f7c7SSage Weil if (!victim->d_inode) 6734260f7c7SSage Weil return -ENOENT; 6744260f7c7SSage Weil 6754260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6764fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 6774260f7c7SSage Weil 6784260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6794260f7c7SSage Weil if (error) 6804260f7c7SSage Weil return error; 6814260f7c7SSage Weil if (IS_APPEND(dir)) 6824260f7c7SSage Weil return -EPERM; 6834260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6844260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6854260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6864260f7c7SSage Weil return -EPERM; 6874260f7c7SSage Weil if (isdir) { 6884260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6894260f7c7SSage Weil return -ENOTDIR; 6904260f7c7SSage Weil if (IS_ROOT(victim)) 6914260f7c7SSage Weil return -EBUSY; 6924260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6934260f7c7SSage Weil return -EISDIR; 6944260f7c7SSage Weil if (IS_DEADDIR(dir)) 6954260f7c7SSage Weil return -ENOENT; 6964260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6974260f7c7SSage Weil return -EBUSY; 6984260f7c7SSage Weil return 0; 6994260f7c7SSage Weil } 7004260f7c7SSage Weil 701cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 702cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 703cb8e7090SChristoph Hellwig { 704cb8e7090SChristoph Hellwig if (child->d_inode) 705cb8e7090SChristoph Hellwig return -EEXIST; 706cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 707cb8e7090SChristoph Hellwig return -ENOENT; 708cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 709cb8e7090SChristoph Hellwig } 710cb8e7090SChristoph Hellwig 711cb8e7090SChristoph Hellwig /* 712cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 713cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 714cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 715cb8e7090SChristoph Hellwig */ 71676dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 71776dda93cSYan, Zheng char *name, int namelen, 71872fd032eSSage Weil struct btrfs_root *snap_src, 7196f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7208696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 721cb8e7090SChristoph Hellwig { 72276dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 723cb8e7090SChristoph Hellwig struct dentry *dentry; 724cb8e7090SChristoph Hellwig int error; 725cb8e7090SChristoph Hellwig 7265c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7275c50c9b8SDavid Sterba if (error == -EINTR) 7285c50c9b8SDavid Sterba return error; 729cb8e7090SChristoph Hellwig 730cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 731cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 732cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 733cb8e7090SChristoph Hellwig goto out_unlock; 734cb8e7090SChristoph Hellwig 735cb8e7090SChristoph Hellwig error = -EEXIST; 736cb8e7090SChristoph Hellwig if (dentry->d_inode) 737cb8e7090SChristoph Hellwig goto out_dput; 738cb8e7090SChristoph Hellwig 73976dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 740cb8e7090SChristoph Hellwig if (error) 741a874a63eSLiu Bo goto out_dput; 742cb8e7090SChristoph Hellwig 7439c52057cSChris Mason /* 7449c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7459c52057cSChris Mason * check for them now when we can safely fail 7469c52057cSChris Mason */ 7479c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7489c52057cSChris Mason dir->i_ino, name, 7499c52057cSChris Mason namelen); 7509c52057cSChris Mason if (error) 7519c52057cSChris Mason goto out_dput; 7529c52057cSChris Mason 75376dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 75476dda93cSYan, Zheng 75576dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 75676dda93cSYan, Zheng goto out_up_read; 75776dda93cSYan, Zheng 7583de4586cSChris Mason if (snap_src) { 759e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7606f72c7e2SArne Jansen async_transid, readonly, inherit); 7613de4586cSChris Mason } else { 762d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 763d5c12070SMiao Xie async_transid, inherit); 7643de4586cSChris Mason } 76576dda93cSYan, Zheng if (!error) 76676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 76776dda93cSYan, Zheng out_up_read: 76876dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 769cb8e7090SChristoph Hellwig out_dput: 770cb8e7090SChristoph Hellwig dput(dentry); 771cb8e7090SChristoph Hellwig out_unlock: 77276dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 773cb8e7090SChristoph Hellwig return error; 774cb8e7090SChristoph Hellwig } 775cb8e7090SChristoph Hellwig 7764cb5300bSChris Mason /* 7774cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7784cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7794cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7804cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7814cb5300bSChris Mason * part of the file 7824cb5300bSChris Mason */ 7834cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7844cb5300bSChris Mason { 7854cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7864cb5300bSChris Mason struct extent_map *em = NULL; 7874cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7884cb5300bSChris Mason u64 end; 7894cb5300bSChris Mason 7904cb5300bSChris Mason read_lock(&em_tree->lock); 7914cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7924cb5300bSChris Mason read_unlock(&em_tree->lock); 7934cb5300bSChris Mason 7944cb5300bSChris Mason if (em) { 7954cb5300bSChris Mason end = extent_map_end(em); 7964cb5300bSChris Mason free_extent_map(em); 7974cb5300bSChris Mason if (end - offset > thresh) 7984cb5300bSChris Mason return 0; 7994cb5300bSChris Mason } 8004cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8014cb5300bSChris Mason thresh /= 2; 8024cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8034cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8044cb5300bSChris Mason if (end >= thresh) 8054cb5300bSChris Mason return 0; 8064cb5300bSChris Mason return 1; 8074cb5300bSChris Mason } 8084cb5300bSChris Mason 8094cb5300bSChris Mason /* 8104cb5300bSChris Mason * helper function to walk through a file and find extents 8114cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8124cb5300bSChris Mason * 8134cb5300bSChris Mason * This is used by the defragging code to find new and small 8144cb5300bSChris Mason * extents 8154cb5300bSChris Mason */ 8164cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8174cb5300bSChris Mason struct inode *inode, u64 newer_than, 8184cb5300bSChris Mason u64 *off, int thresh) 8194cb5300bSChris Mason { 8204cb5300bSChris Mason struct btrfs_path *path; 8214cb5300bSChris Mason struct btrfs_key min_key; 8224cb5300bSChris Mason struct btrfs_key max_key; 8234cb5300bSChris Mason struct extent_buffer *leaf; 8244cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8254cb5300bSChris Mason int type; 8264cb5300bSChris Mason int ret; 827a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8284cb5300bSChris Mason 8294cb5300bSChris Mason path = btrfs_alloc_path(); 8304cb5300bSChris Mason if (!path) 8314cb5300bSChris Mason return -ENOMEM; 8324cb5300bSChris Mason 833a4689d2bSDavid Sterba min_key.objectid = ino; 8344cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8354cb5300bSChris Mason min_key.offset = *off; 8364cb5300bSChris Mason 837a4689d2bSDavid Sterba max_key.objectid = ino; 8384cb5300bSChris Mason max_key.type = (u8)-1; 8394cb5300bSChris Mason max_key.offset = (u64)-1; 8404cb5300bSChris Mason 8414cb5300bSChris Mason path->keep_locks = 1; 8424cb5300bSChris Mason 8434cb5300bSChris Mason while(1) { 8444cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 845de78b51aSEric Sandeen path, newer_than); 8464cb5300bSChris Mason if (ret != 0) 8474cb5300bSChris Mason goto none; 848a4689d2bSDavid Sterba if (min_key.objectid != ino) 8494cb5300bSChris Mason goto none; 8504cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8514cb5300bSChris Mason goto none; 8524cb5300bSChris Mason 8534cb5300bSChris Mason leaf = path->nodes[0]; 8544cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8554cb5300bSChris Mason struct btrfs_file_extent_item); 8564cb5300bSChris Mason 8574cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8584cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8594cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8604cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8614cb5300bSChris Mason *off = min_key.offset; 8624cb5300bSChris Mason btrfs_free_path(path); 8634cb5300bSChris Mason return 0; 8644cb5300bSChris Mason } 8654cb5300bSChris Mason 8664cb5300bSChris Mason if (min_key.offset == (u64)-1) 8674cb5300bSChris Mason goto none; 8684cb5300bSChris Mason 8694cb5300bSChris Mason min_key.offset++; 8704cb5300bSChris Mason btrfs_release_path(path); 8714cb5300bSChris Mason } 8724cb5300bSChris Mason none: 8734cb5300bSChris Mason btrfs_free_path(path); 8744cb5300bSChris Mason return -ENOENT; 8754cb5300bSChris Mason } 8764cb5300bSChris Mason 8776c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 87817ce6ef8SLiu Bo { 87917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 880940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8816c282eb4SLi Zefan struct extent_map *em; 8826c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 883940100a4SChris Mason 884940100a4SChris Mason /* 885940100a4SChris Mason * hopefully we have this extent in the tree already, try without 886940100a4SChris Mason * the full extent lock 887940100a4SChris Mason */ 888940100a4SChris Mason read_lock(&em_tree->lock); 889940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 890940100a4SChris Mason read_unlock(&em_tree->lock); 891940100a4SChris Mason 892940100a4SChris Mason if (!em) { 893940100a4SChris Mason /* get the big lock and read metadata off disk */ 894d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 895940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 896d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 897940100a4SChris Mason 8986cf8bfbfSDan Carpenter if (IS_ERR(em)) 8996c282eb4SLi Zefan return NULL; 900940100a4SChris Mason } 901940100a4SChris Mason 9026c282eb4SLi Zefan return em; 9036c282eb4SLi Zefan } 9046c282eb4SLi Zefan 9056c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9066c282eb4SLi Zefan { 9076c282eb4SLi Zefan struct extent_map *next; 9086c282eb4SLi Zefan bool ret = true; 9096c282eb4SLi Zefan 9106c282eb4SLi Zefan /* this is the last extent */ 9116c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9126c282eb4SLi Zefan return false; 9136c282eb4SLi Zefan 9146c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9156c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9166c282eb4SLi Zefan ret = false; 9176c282eb4SLi Zefan 9186c282eb4SLi Zefan free_extent_map(next); 9196c282eb4SLi Zefan return ret; 9206c282eb4SLi Zefan } 9216c282eb4SLi Zefan 9226c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 923a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 924a43a2111SAndrew Mahone int compress) 9256c282eb4SLi Zefan { 9266c282eb4SLi Zefan struct extent_map *em; 9276c282eb4SLi Zefan int ret = 1; 9286c282eb4SLi Zefan bool next_mergeable = true; 9296c282eb4SLi Zefan 9306c282eb4SLi Zefan /* 9316c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9326c282eb4SLi Zefan * defragging it 9336c282eb4SLi Zefan */ 9346c282eb4SLi Zefan if (start < *defrag_end) 9356c282eb4SLi Zefan return 1; 9366c282eb4SLi Zefan 9376c282eb4SLi Zefan *skip = 0; 9386c282eb4SLi Zefan 9396c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9406c282eb4SLi Zefan if (!em) 9416c282eb4SLi Zefan return 0; 9426c282eb4SLi Zefan 943940100a4SChris Mason /* this will cover holes, and inline extents */ 94417ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 945940100a4SChris Mason ret = 0; 94617ce6ef8SLiu Bo goto out; 94717ce6ef8SLiu Bo } 94817ce6ef8SLiu Bo 9496c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 950940100a4SChris Mason 951940100a4SChris Mason /* 9526c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9536c282eb4SLi Zefan * real extent, don't bother defragging it 954940100a4SChris Mason */ 955a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9566c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 957940100a4SChris Mason ret = 0; 95817ce6ef8SLiu Bo out: 959940100a4SChris Mason /* 960940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 961940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 962940100a4SChris Mason * so that the next tiny extent will force a defrag. 963940100a4SChris Mason * 964940100a4SChris Mason * The end result of this is that tiny extents before a single big 965940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 966940100a4SChris Mason */ 967940100a4SChris Mason if (ret) { 968940100a4SChris Mason *defrag_end = extent_map_end(em); 969940100a4SChris Mason } else { 970940100a4SChris Mason *last_len = 0; 971940100a4SChris Mason *skip = extent_map_end(em); 972940100a4SChris Mason *defrag_end = 0; 973940100a4SChris Mason } 974940100a4SChris Mason 975940100a4SChris Mason free_extent_map(em); 976940100a4SChris Mason return ret; 977940100a4SChris Mason } 978940100a4SChris Mason 9794cb5300bSChris Mason /* 9804cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9814cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9824cb5300bSChris Mason * to COW and defrag. 9834cb5300bSChris Mason * 9844cb5300bSChris Mason * It also makes sure the delalloc code has enough 9854cb5300bSChris Mason * dirty data to avoid making new small extents as part 9864cb5300bSChris Mason * of the defrag 9874cb5300bSChris Mason * 9884cb5300bSChris Mason * It's a good idea to start RA on this range 9894cb5300bSChris Mason * before calling this. 9904cb5300bSChris Mason */ 9914cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9924cb5300bSChris Mason struct page **pages, 9934cb5300bSChris Mason unsigned long start_index, 9944cb5300bSChris Mason int num_pages) 995f46b5a66SChristoph Hellwig { 9964cb5300bSChris Mason unsigned long file_end; 9974cb5300bSChris Mason u64 isize = i_size_read(inode); 998f46b5a66SChristoph Hellwig u64 page_start; 999f46b5a66SChristoph Hellwig u64 page_end; 10001f12bd06SLiu Bo u64 page_cnt; 10014cb5300bSChris Mason int ret; 10024cb5300bSChris Mason int i; 10034cb5300bSChris Mason int i_done; 10044cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10054cb5300bSChris Mason struct extent_state *cached_state = NULL; 1006600a45e1SMiao Xie struct extent_io_tree *tree; 10073b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10084cb5300bSChris Mason 10094cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10101f12bd06SLiu Bo if (!isize || start_index > file_end) 10111f12bd06SLiu Bo return 0; 10121f12bd06SLiu Bo 10131f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10144cb5300bSChris Mason 10154cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10161f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10174cb5300bSChris Mason if (ret) 10184cb5300bSChris Mason return ret; 10194cb5300bSChris Mason i_done = 0; 1020600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10214cb5300bSChris Mason 10224cb5300bSChris Mason /* step one, lock all the pages */ 10231f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10244cb5300bSChris Mason struct page *page; 1025600a45e1SMiao Xie again: 1026a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10273b16a4e3SJosef Bacik start_index + i, mask); 10284cb5300bSChris Mason if (!page) 10294cb5300bSChris Mason break; 10304cb5300bSChris Mason 1031600a45e1SMiao Xie page_start = page_offset(page); 1032600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1033600a45e1SMiao Xie while (1) { 1034d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1035600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1036600a45e1SMiao Xie page_start); 1037d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1038600a45e1SMiao Xie if (!ordered) 1039600a45e1SMiao Xie break; 1040600a45e1SMiao Xie 1041600a45e1SMiao Xie unlock_page(page); 1042600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1043600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1044600a45e1SMiao Xie lock_page(page); 10451f12bd06SLiu Bo /* 10461f12bd06SLiu Bo * we unlocked the page above, so we need check if 10471f12bd06SLiu Bo * it was released or not. 10481f12bd06SLiu Bo */ 10491f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10501f12bd06SLiu Bo unlock_page(page); 10511f12bd06SLiu Bo page_cache_release(page); 10521f12bd06SLiu Bo goto again; 10531f12bd06SLiu Bo } 1054600a45e1SMiao Xie } 1055600a45e1SMiao Xie 10564cb5300bSChris Mason if (!PageUptodate(page)) { 10574cb5300bSChris Mason btrfs_readpage(NULL, page); 10584cb5300bSChris Mason lock_page(page); 10594cb5300bSChris Mason if (!PageUptodate(page)) { 10604cb5300bSChris Mason unlock_page(page); 10614cb5300bSChris Mason page_cache_release(page); 10624cb5300bSChris Mason ret = -EIO; 10634cb5300bSChris Mason break; 10644cb5300bSChris Mason } 10654cb5300bSChris Mason } 1066600a45e1SMiao Xie 1067600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1068600a45e1SMiao Xie unlock_page(page); 1069600a45e1SMiao Xie page_cache_release(page); 1070600a45e1SMiao Xie goto again; 1071600a45e1SMiao Xie } 1072600a45e1SMiao Xie 10734cb5300bSChris Mason pages[i] = page; 10744cb5300bSChris Mason i_done++; 10754cb5300bSChris Mason } 10764cb5300bSChris Mason if (!i_done || ret) 10774cb5300bSChris Mason goto out; 10784cb5300bSChris Mason 10794cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10804cb5300bSChris Mason goto out; 10814cb5300bSChris Mason 10824cb5300bSChris Mason /* 10834cb5300bSChris Mason * so now we have a nice long stream of locked 10844cb5300bSChris Mason * and up to date pages, lets wait on them 10854cb5300bSChris Mason */ 10864cb5300bSChris Mason for (i = 0; i < i_done; i++) 10874cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10884cb5300bSChris Mason 10894cb5300bSChris Mason page_start = page_offset(pages[0]); 10904cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10914cb5300bSChris Mason 10924cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1093d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10944cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10954cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10969e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 10979e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10984cb5300bSChris Mason 10991f12bd06SLiu Bo if (i_done != page_cnt) { 11009e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11019e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11029e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11034cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11041f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11054cb5300bSChris Mason } 11064cb5300bSChris Mason 11074cb5300bSChris Mason 11089e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11099e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11104cb5300bSChris Mason 11114cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11124cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11134cb5300bSChris Mason GFP_NOFS); 11144cb5300bSChris Mason 11154cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11164cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11174cb5300bSChris Mason ClearPageChecked(pages[i]); 11184cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11194cb5300bSChris Mason set_page_dirty(pages[i]); 11204cb5300bSChris Mason unlock_page(pages[i]); 11214cb5300bSChris Mason page_cache_release(pages[i]); 11224cb5300bSChris Mason } 11234cb5300bSChris Mason return i_done; 11244cb5300bSChris Mason out: 11254cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11264cb5300bSChris Mason unlock_page(pages[i]); 11274cb5300bSChris Mason page_cache_release(pages[i]); 11284cb5300bSChris Mason } 11291f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11304cb5300bSChris Mason return ret; 11314cb5300bSChris Mason 11324cb5300bSChris Mason } 11334cb5300bSChris Mason 11344cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11354cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11364cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11374cb5300bSChris Mason { 11384cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11394cb5300bSChris Mason struct file_ra_state *ra = NULL; 11404cb5300bSChris Mason unsigned long last_index; 1141151a31b2SLi Zefan u64 isize = i_size_read(inode); 1142940100a4SChris Mason u64 last_len = 0; 1143940100a4SChris Mason u64 skip = 0; 1144940100a4SChris Mason u64 defrag_end = 0; 11454cb5300bSChris Mason u64 newer_off = range->start; 1146f46b5a66SChristoph Hellwig unsigned long i; 1147008873eaSLi Zefan unsigned long ra_index = 0; 1148f46b5a66SChristoph Hellwig int ret; 11494cb5300bSChris Mason int defrag_count = 0; 11501a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11514cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1152008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1153008873eaSLi Zefan int cluster = max_cluster; 11544cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11554cb5300bSChris Mason struct page **pages = NULL; 11564cb5300bSChris Mason 11570abd5b17SLiu Bo if (isize == 0) 11580abd5b17SLiu Bo return 0; 11590abd5b17SLiu Bo 11600abd5b17SLiu Bo if (range->start >= isize) 11610abd5b17SLiu Bo return -EINVAL; 11621a419d85SLi Zefan 11631a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11641a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11651a419d85SLi Zefan return -EINVAL; 11661a419d85SLi Zefan if (range->compress_type) 11671a419d85SLi Zefan compress_type = range->compress_type; 11681a419d85SLi Zefan } 1169f46b5a66SChristoph Hellwig 11700abd5b17SLiu Bo if (extent_thresh == 0) 11710abd5b17SLiu Bo extent_thresh = 256 * 1024; 1172f46b5a66SChristoph Hellwig 11734cb5300bSChris Mason /* 11744cb5300bSChris Mason * if we were not given a file, allocate a readahead 11754cb5300bSChris Mason * context 11764cb5300bSChris Mason */ 11774cb5300bSChris Mason if (!file) { 11784cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11794cb5300bSChris Mason if (!ra) 11804cb5300bSChris Mason return -ENOMEM; 11814cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11824cb5300bSChris Mason } else { 11834cb5300bSChris Mason ra = &file->f_ra; 11844cb5300bSChris Mason } 11854cb5300bSChris Mason 1186008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11874cb5300bSChris Mason GFP_NOFS); 11884cb5300bSChris Mason if (!pages) { 11894cb5300bSChris Mason ret = -ENOMEM; 11904cb5300bSChris Mason goto out_ra; 11914cb5300bSChris Mason } 11924cb5300bSChris Mason 11934cb5300bSChris Mason /* find the last page to defrag */ 11941e701a32SChris Mason if (range->start + range->len > range->start) { 1195151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11961e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11971e701a32SChris Mason } else { 1198151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11991e701a32SChris Mason } 12001e701a32SChris Mason 12014cb5300bSChris Mason if (newer_than) { 12024cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12034cb5300bSChris Mason &newer_off, 64 * 1024); 12044cb5300bSChris Mason if (!ret) { 12054cb5300bSChris Mason range->start = newer_off; 12064cb5300bSChris Mason /* 12074cb5300bSChris Mason * we always align our defrag to help keep 12084cb5300bSChris Mason * the extents in the file evenly spaced 12094cb5300bSChris Mason */ 12104cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12114cb5300bSChris Mason } else 12124cb5300bSChris Mason goto out_ra; 12134cb5300bSChris Mason } else { 12141e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12154cb5300bSChris Mason } 12164cb5300bSChris Mason if (!max_to_defrag) 12177ec31b54SLiu Bo max_to_defrag = last_index + 1; 12184cb5300bSChris Mason 12192a0f7f57SLi Zefan /* 12202a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12212a0f7f57SLi Zefan * written sequentially. 12222a0f7f57SLi Zefan */ 12232a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12242a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12252a0f7f57SLi Zefan 1226f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1227f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1228f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12294cb5300bSChris Mason /* 12304cb5300bSChris Mason * make sure we stop running if someone unmounts 12314cb5300bSChris Mason * the FS 12324cb5300bSChris Mason */ 12334cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12344cb5300bSChris Mason break; 12354cb5300bSChris Mason 1236210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1237210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1238210549ebSDavid Sterba ret = -EAGAIN; 1239210549ebSDavid Sterba break; 1240210549ebSDavid Sterba } 1241210549ebSDavid Sterba 124266c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12436c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1244a43a2111SAndrew Mahone &defrag_end, range->flags & 1245a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1246940100a4SChris Mason unsigned long next; 1247940100a4SChris Mason /* 1248940100a4SChris Mason * the should_defrag function tells us how much to skip 1249940100a4SChris Mason * bump our counter by the suggested amount 1250940100a4SChris Mason */ 1251940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1252940100a4SChris Mason i = max(i + 1, next); 1253940100a4SChris Mason continue; 1254940100a4SChris Mason } 1255008873eaSLi Zefan 1256008873eaSLi Zefan if (!newer_than) { 1257008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1258008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1259008873eaSLi Zefan cluster = min(cluster, max_cluster); 1260008873eaSLi Zefan } else { 1261008873eaSLi Zefan cluster = max_cluster; 1262008873eaSLi Zefan } 1263008873eaSLi Zefan 12641e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 12651a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1266940100a4SChris Mason 1267008873eaSLi Zefan if (i + cluster > ra_index) { 1268008873eaSLi Zefan ra_index = max(i, ra_index); 1269008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1270008873eaSLi Zefan cluster); 1271008873eaSLi Zefan ra_index += max_cluster; 1272008873eaSLi Zefan } 12734cb5300bSChris Mason 1274ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1275008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1276ecb8bea8SLiu Bo if (ret < 0) { 1277ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12784cb5300bSChris Mason goto out_ra; 1279ecb8bea8SLiu Bo } 12804cb5300bSChris Mason 12814cb5300bSChris Mason defrag_count += ret; 1282d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1283ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12844cb5300bSChris Mason 12854cb5300bSChris Mason if (newer_than) { 12864cb5300bSChris Mason if (newer_off == (u64)-1) 12874cb5300bSChris Mason break; 12884cb5300bSChris Mason 1289e1f041e1SLiu Bo if (ret > 0) 1290e1f041e1SLiu Bo i += ret; 1291e1f041e1SLiu Bo 12924cb5300bSChris Mason newer_off = max(newer_off + 1, 12934cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12944cb5300bSChris Mason 12954cb5300bSChris Mason ret = find_new_extents(root, inode, 12964cb5300bSChris Mason newer_than, &newer_off, 12974cb5300bSChris Mason 64 * 1024); 12984cb5300bSChris Mason if (!ret) { 12994cb5300bSChris Mason range->start = newer_off; 13004cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13014cb5300bSChris Mason } else { 13024cb5300bSChris Mason break; 1303940100a4SChris Mason } 13044cb5300bSChris Mason } else { 1305008873eaSLi Zefan if (ret > 0) { 1306cbcc8326SLi Zefan i += ret; 1307008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1308008873eaSLi Zefan } else { 1309940100a4SChris Mason i++; 1310008873eaSLi Zefan last_len = 0; 1311008873eaSLi Zefan } 1312f46b5a66SChristoph Hellwig } 13134cb5300bSChris Mason } 1314f46b5a66SChristoph Hellwig 13151e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13161e701a32SChris Mason filemap_flush(inode->i_mapping); 13171e701a32SChris Mason 13181e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13191e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13201e701a32SChris Mason * we have to make sure the IO is actually started and that 13211e701a32SChris Mason * ordered extents get created before we return 13221e701a32SChris Mason */ 13231e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13241e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13251e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13261e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13271e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13281e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13291e701a32SChris Mason } 13301e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13311e701a32SChris Mason 13321e701a32SChris Mason mutex_lock(&inode->i_mutex); 1333261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 13341e701a32SChris Mason mutex_unlock(&inode->i_mutex); 13351e701a32SChris Mason } 13361e701a32SChris Mason 13371a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13382b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13391a419d85SLi Zefan } 13401a419d85SLi Zefan 134160ccf82fSDiego Calleja ret = defrag_count; 1342940100a4SChris Mason 13434cb5300bSChris Mason out_ra: 13444cb5300bSChris Mason if (!file) 13454cb5300bSChris Mason kfree(ra); 13464cb5300bSChris Mason kfree(pages); 1347940100a4SChris Mason return ret; 1348f46b5a66SChristoph Hellwig } 1349f46b5a66SChristoph Hellwig 1350198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 135176dda93cSYan, Zheng void __user *arg) 1352f46b5a66SChristoph Hellwig { 1353f46b5a66SChristoph Hellwig u64 new_size; 1354f46b5a66SChristoph Hellwig u64 old_size; 1355f46b5a66SChristoph Hellwig u64 devid = 1; 1356496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1357f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1358f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1359f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1360f46b5a66SChristoph Hellwig char *sizestr; 1361f46b5a66SChristoph Hellwig char *devstr = NULL; 1362f46b5a66SChristoph Hellwig int ret = 0; 1363f46b5a66SChristoph Hellwig int mod = 0; 1364f46b5a66SChristoph Hellwig 1365e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1366e441d54dSChris Mason return -EPERM; 1367e441d54dSChris Mason 1368198605a8SMiao Xie ret = mnt_want_write_file(file); 1369198605a8SMiao Xie if (ret) 1370198605a8SMiao Xie return ret; 1371198605a8SMiao Xie 13725ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13735ac00addSStefan Behrens 1)) { 13745ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 137597547676SMiao Xie mnt_drop_write_file(file); 13762c0c9da0SIlya Dryomov return -EINVAL; 1377c9e9f97bSIlya Dryomov } 1378c9e9f97bSIlya Dryomov 13795ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1380dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1381c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1382c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1383c9e9f97bSIlya Dryomov goto out; 1384c9e9f97bSIlya Dryomov } 13855516e595SMark Fasheh 13865516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1387f46b5a66SChristoph Hellwig 1388f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1389f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1390f46b5a66SChristoph Hellwig if (devstr) { 1391f46b5a66SChristoph Hellwig char *end; 1392f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1393f46b5a66SChristoph Hellwig *devstr = '\0'; 1394f46b5a66SChristoph Hellwig devstr = vol_args->name; 1395f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1396dfd79829SMiao Xie if (!devid) { 1397dfd79829SMiao Xie ret = -EINVAL; 1398dfd79829SMiao Xie goto out_free; 1399dfd79829SMiao Xie } 14005bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 140121380931SJoel Becker (unsigned long long)devid); 1402f46b5a66SChristoph Hellwig } 1403dba60f3fSMiao Xie 1404aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1405f46b5a66SChristoph Hellwig if (!device) { 14065bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 140721380931SJoel Becker (unsigned long long)devid); 1408dfd79829SMiao Xie ret = -ENODEV; 1409c9e9f97bSIlya Dryomov goto out_free; 1410f46b5a66SChristoph Hellwig } 1411dba60f3fSMiao Xie 1412dba60f3fSMiao Xie if (!device->writeable) { 14134e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1414dba60f3fSMiao Xie "readonly device %llu\n", 1415a8c4a33bSChris Mason (unsigned long long)devid); 1416dfd79829SMiao Xie ret = -EPERM; 14174e42ae1bSLiu Bo goto out_free; 14184e42ae1bSLiu Bo } 14194e42ae1bSLiu Bo 1420f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1421f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1422f46b5a66SChristoph Hellwig else { 1423f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1424f46b5a66SChristoph Hellwig mod = -1; 1425f46b5a66SChristoph Hellwig sizestr++; 1426f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1427f46b5a66SChristoph Hellwig mod = 1; 1428f46b5a66SChristoph Hellwig sizestr++; 1429f46b5a66SChristoph Hellwig } 143091748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1431f46b5a66SChristoph Hellwig if (new_size == 0) { 1432f46b5a66SChristoph Hellwig ret = -EINVAL; 1433c9e9f97bSIlya Dryomov goto out_free; 1434f46b5a66SChristoph Hellwig } 1435f46b5a66SChristoph Hellwig } 1436f46b5a66SChristoph Hellwig 143763a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1438dfd79829SMiao Xie ret = -EPERM; 143963a212abSStefan Behrens goto out_free; 144063a212abSStefan Behrens } 144163a212abSStefan Behrens 1442f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1443f46b5a66SChristoph Hellwig 1444f46b5a66SChristoph Hellwig if (mod < 0) { 1445f46b5a66SChristoph Hellwig if (new_size > old_size) { 1446f46b5a66SChristoph Hellwig ret = -EINVAL; 1447c9e9f97bSIlya Dryomov goto out_free; 1448f46b5a66SChristoph Hellwig } 1449f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1450f46b5a66SChristoph Hellwig } else if (mod > 0) { 1451f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1452f46b5a66SChristoph Hellwig } 1453f46b5a66SChristoph Hellwig 1454f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1455f46b5a66SChristoph Hellwig ret = -EINVAL; 1456c9e9f97bSIlya Dryomov goto out_free; 1457f46b5a66SChristoph Hellwig } 1458f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1459f46b5a66SChristoph Hellwig ret = -EFBIG; 1460c9e9f97bSIlya Dryomov goto out_free; 1461f46b5a66SChristoph Hellwig } 1462f46b5a66SChristoph Hellwig 1463f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1464f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1465f46b5a66SChristoph Hellwig 1466606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1467606686eeSJosef Bacik rcu_str_deref(device->name), 1468606686eeSJosef Bacik (unsigned long long)new_size); 1469f46b5a66SChristoph Hellwig 1470f46b5a66SChristoph Hellwig if (new_size > old_size) { 1471a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 147298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 147398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1474c9e9f97bSIlya Dryomov goto out_free; 147598d5dc13STsutomu Itoh } 1476f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1477f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1478ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1479f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14800253f40eSjeff.liu } /* equal, nothing need to do */ 1481f46b5a66SChristoph Hellwig 1482c9e9f97bSIlya Dryomov out_free: 1483f46b5a66SChristoph Hellwig kfree(vol_args); 1484c9e9f97bSIlya Dryomov out: 1485c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 14865ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 148718f39c41SIlya Dryomov mnt_drop_write_file(file); 1488f46b5a66SChristoph Hellwig return ret; 1489f46b5a66SChristoph Hellwig } 1490f46b5a66SChristoph Hellwig 149172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 14926f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 14936f72c7e2SArne Jansen u64 *transid, bool readonly, 14948696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1495f46b5a66SChristoph Hellwig { 1496f46b5a66SChristoph Hellwig int namelen; 14973de4586cSChris Mason int ret = 0; 1498f46b5a66SChristoph Hellwig 1499a874a63eSLiu Bo ret = mnt_want_write_file(file); 1500a874a63eSLiu Bo if (ret) 1501a874a63eSLiu Bo goto out; 1502a874a63eSLiu Bo 150372fd032eSSage Weil namelen = strlen(name); 150472fd032eSSage Weil if (strchr(name, '/')) { 1505f46b5a66SChristoph Hellwig ret = -EINVAL; 1506a874a63eSLiu Bo goto out_drop_write; 1507f46b5a66SChristoph Hellwig } 1508f46b5a66SChristoph Hellwig 150916780cabSChris Mason if (name[0] == '.' && 151016780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 151116780cabSChris Mason ret = -EEXIST; 1512a874a63eSLiu Bo goto out_drop_write; 151316780cabSChris Mason } 151416780cabSChris Mason 15153de4586cSChris Mason if (subvol) { 151672fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15176f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1518cb8e7090SChristoph Hellwig } else { 15192903ff01SAl Viro struct fd src = fdget(fd); 15203de4586cSChris Mason struct inode *src_inode; 15212903ff01SAl Viro if (!src.file) { 15223de4586cSChris Mason ret = -EINVAL; 1523a874a63eSLiu Bo goto out_drop_write; 15243de4586cSChris Mason } 15253de4586cSChris Mason 1526496ad9aaSAl Viro src_inode = file_inode(src.file); 1527496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1528d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1529d397712bSChris Mason "another FS\n"); 15303de4586cSChris Mason ret = -EINVAL; 1531ecd18815SAl Viro } else { 153272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 153372fd032eSSage Weil BTRFS_I(src_inode)->root, 15346f72c7e2SArne Jansen transid, readonly, inherit); 1535ecd18815SAl Viro } 15362903ff01SAl Viro fdput(src); 1537cb8e7090SChristoph Hellwig } 1538a874a63eSLiu Bo out_drop_write: 1539a874a63eSLiu Bo mnt_drop_write_file(file); 1540f46b5a66SChristoph Hellwig out: 154172fd032eSSage Weil return ret; 154272fd032eSSage Weil } 154372fd032eSSage Weil 154472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1545fa0d2b9bSLi Zefan void __user *arg, int subvol) 154672fd032eSSage Weil { 1547fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 154872fd032eSSage Weil int ret; 154972fd032eSSage Weil 1550fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1551fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1552fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1553fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1554fa0d2b9bSLi Zefan 1555fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1556b83cc969SLi Zefan vol_args->fd, subvol, 15576f72c7e2SArne Jansen NULL, false, NULL); 1558fa0d2b9bSLi Zefan 1559fa0d2b9bSLi Zefan kfree(vol_args); 1560fa0d2b9bSLi Zefan return ret; 1561fa0d2b9bSLi Zefan } 1562fa0d2b9bSLi Zefan 1563fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1564fa0d2b9bSLi Zefan void __user *arg, int subvol) 1565fa0d2b9bSLi Zefan { 1566fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1567fa0d2b9bSLi Zefan int ret; 1568fdfb1e4fSLi Zefan u64 transid = 0; 1569fdfb1e4fSLi Zefan u64 *ptr = NULL; 1570b83cc969SLi Zefan bool readonly = false; 15716f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 157272fd032eSSage Weil 1573fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1574fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1575fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1576fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1577fdfb1e4fSLi Zefan 1578b83cc969SLi Zefan if (vol_args->flags & 15796f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15806f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1581b83cc969SLi Zefan ret = -EOPNOTSUPP; 1582fdfb1e4fSLi Zefan goto out; 1583fdfb1e4fSLi Zefan } 1584fdfb1e4fSLi Zefan 1585fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1586fdfb1e4fSLi Zefan ptr = &transid; 1587b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1588b83cc969SLi Zefan readonly = true; 15896f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 15906f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 15916f72c7e2SArne Jansen ret = -EINVAL; 15926f72c7e2SArne Jansen goto out; 15936f72c7e2SArne Jansen } 15946f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 15956f72c7e2SArne Jansen if (IS_ERR(inherit)) { 15966f72c7e2SArne Jansen ret = PTR_ERR(inherit); 15976f72c7e2SArne Jansen goto out; 15986f72c7e2SArne Jansen } 15996f72c7e2SArne Jansen } 160075eaa0e2SSage Weil 1601fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16026f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16038696c533SMiao Xie readonly, inherit); 160475eaa0e2SSage Weil 1605fdfb1e4fSLi Zefan if (ret == 0 && ptr && 160675eaa0e2SSage Weil copy_to_user(arg + 1607fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1608fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 160975eaa0e2SSage Weil ret = -EFAULT; 1610fdfb1e4fSLi Zefan out: 1611f46b5a66SChristoph Hellwig kfree(vol_args); 16126f72c7e2SArne Jansen kfree(inherit); 1613f46b5a66SChristoph Hellwig return ret; 1614f46b5a66SChristoph Hellwig } 1615f46b5a66SChristoph Hellwig 16160caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16170caa102dSLi Zefan void __user *arg) 16180caa102dSLi Zefan { 1619496ad9aaSAl Viro struct inode *inode = file_inode(file); 16200caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16210caa102dSLi Zefan int ret = 0; 16220caa102dSLi Zefan u64 flags = 0; 16230caa102dSLi Zefan 162433345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16250caa102dSLi Zefan return -EINVAL; 16260caa102dSLi Zefan 16270caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16280caa102dSLi Zefan if (btrfs_root_readonly(root)) 16290caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16300caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16310caa102dSLi Zefan 16320caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16330caa102dSLi Zefan ret = -EFAULT; 16340caa102dSLi Zefan 16350caa102dSLi Zefan return ret; 16360caa102dSLi Zefan } 16370caa102dSLi Zefan 16380caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16390caa102dSLi Zefan void __user *arg) 16400caa102dSLi Zefan { 1641496ad9aaSAl Viro struct inode *inode = file_inode(file); 16420caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16430caa102dSLi Zefan struct btrfs_trans_handle *trans; 16440caa102dSLi Zefan u64 root_flags; 16450caa102dSLi Zefan u64 flags; 16460caa102dSLi Zefan int ret = 0; 16470caa102dSLi Zefan 1648b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1649b9ca0664SLiu Bo if (ret) 1650b9ca0664SLiu Bo goto out; 16510caa102dSLi Zefan 1652b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1653b9ca0664SLiu Bo ret = -EINVAL; 1654b9ca0664SLiu Bo goto out_drop_write; 1655b9ca0664SLiu Bo } 16560caa102dSLi Zefan 1657b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1658b9ca0664SLiu Bo ret = -EFAULT; 1659b9ca0664SLiu Bo goto out_drop_write; 1660b9ca0664SLiu Bo } 16610caa102dSLi Zefan 1662b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1663b9ca0664SLiu Bo ret = -EINVAL; 1664b9ca0664SLiu Bo goto out_drop_write; 1665b9ca0664SLiu Bo } 16660caa102dSLi Zefan 1667b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1668b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1669b9ca0664SLiu Bo goto out_drop_write; 1670b9ca0664SLiu Bo } 16710caa102dSLi Zefan 1672b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1673b9ca0664SLiu Bo ret = -EACCES; 1674b9ca0664SLiu Bo goto out_drop_write; 1675b9ca0664SLiu Bo } 1676b4dc2b8cSLi Zefan 16770caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16780caa102dSLi Zefan 16790caa102dSLi Zefan /* nothing to do */ 16800caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1681b9ca0664SLiu Bo goto out_drop_sem; 16820caa102dSLi Zefan 16830caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 16840caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 16850caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16860caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 16870caa102dSLi Zefan else 16880caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16890caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 16900caa102dSLi Zefan 16910caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 16920caa102dSLi Zefan if (IS_ERR(trans)) { 16930caa102dSLi Zefan ret = PTR_ERR(trans); 16940caa102dSLi Zefan goto out_reset; 16950caa102dSLi Zefan } 16960caa102dSLi Zefan 1697b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 16980caa102dSLi Zefan &root->root_key, &root->root_item); 16990caa102dSLi Zefan 17000caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17010caa102dSLi Zefan out_reset: 17020caa102dSLi Zefan if (ret) 17030caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1704b9ca0664SLiu Bo out_drop_sem: 17050caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1706b9ca0664SLiu Bo out_drop_write: 1707b9ca0664SLiu Bo mnt_drop_write_file(file); 1708b9ca0664SLiu Bo out: 17090caa102dSLi Zefan return ret; 17100caa102dSLi Zefan } 17110caa102dSLi Zefan 171276dda93cSYan, Zheng /* 171376dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 171476dda93cSYan, Zheng */ 171576dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 171676dda93cSYan, Zheng { 171776dda93cSYan, Zheng struct btrfs_path *path; 171876dda93cSYan, Zheng struct btrfs_key key; 171976dda93cSYan, Zheng int ret; 172076dda93cSYan, Zheng 172176dda93cSYan, Zheng path = btrfs_alloc_path(); 172276dda93cSYan, Zheng if (!path) 172376dda93cSYan, Zheng return -ENOMEM; 172476dda93cSYan, Zheng 172576dda93cSYan, Zheng key.objectid = root->root_key.objectid; 172676dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 172776dda93cSYan, Zheng key.offset = (u64)-1; 172876dda93cSYan, Zheng 172976dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 173076dda93cSYan, Zheng &key, path, 0, 0); 173176dda93cSYan, Zheng if (ret < 0) 173276dda93cSYan, Zheng goto out; 173376dda93cSYan, Zheng BUG_ON(ret == 0); 173476dda93cSYan, Zheng 173576dda93cSYan, Zheng ret = 0; 173676dda93cSYan, Zheng if (path->slots[0] > 0) { 173776dda93cSYan, Zheng path->slots[0]--; 173876dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 173976dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 174076dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 174176dda93cSYan, Zheng ret = -ENOTEMPTY; 174276dda93cSYan, Zheng } 174376dda93cSYan, Zheng out: 174476dda93cSYan, Zheng btrfs_free_path(path); 174576dda93cSYan, Zheng return ret; 174676dda93cSYan, Zheng } 174776dda93cSYan, Zheng 1748ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1749ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1750ac8e9819SChris Mason { 1751abc6e134SChris Mason struct btrfs_key test; 1752abc6e134SChris Mason int ret; 1753abc6e134SChris Mason 1754abc6e134SChris Mason test.objectid = sk->min_objectid; 1755abc6e134SChris Mason test.type = sk->min_type; 1756abc6e134SChris Mason test.offset = sk->min_offset; 1757abc6e134SChris Mason 1758abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1759abc6e134SChris Mason if (ret < 0) 1760ac8e9819SChris Mason return 0; 1761abc6e134SChris Mason 1762abc6e134SChris Mason test.objectid = sk->max_objectid; 1763abc6e134SChris Mason test.type = sk->max_type; 1764abc6e134SChris Mason test.offset = sk->max_offset; 1765abc6e134SChris Mason 1766abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1767abc6e134SChris Mason if (ret > 0) 1768ac8e9819SChris Mason return 0; 1769ac8e9819SChris Mason return 1; 1770ac8e9819SChris Mason } 1771ac8e9819SChris Mason 1772ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1773ac8e9819SChris Mason struct btrfs_path *path, 1774ac8e9819SChris Mason struct btrfs_key *key, 1775ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1776ac8e9819SChris Mason char *buf, 1777ac8e9819SChris Mason unsigned long *sk_offset, 1778ac8e9819SChris Mason int *num_found) 1779ac8e9819SChris Mason { 1780ac8e9819SChris Mason u64 found_transid; 1781ac8e9819SChris Mason struct extent_buffer *leaf; 1782ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1783ac8e9819SChris Mason unsigned long item_off; 1784ac8e9819SChris Mason unsigned long item_len; 1785ac8e9819SChris Mason int nritems; 1786ac8e9819SChris Mason int i; 1787ac8e9819SChris Mason int slot; 1788ac8e9819SChris Mason int ret = 0; 1789ac8e9819SChris Mason 1790ac8e9819SChris Mason leaf = path->nodes[0]; 1791ac8e9819SChris Mason slot = path->slots[0]; 1792ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1793ac8e9819SChris Mason 1794ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1795ac8e9819SChris Mason i = nritems; 1796ac8e9819SChris Mason goto advance_key; 1797ac8e9819SChris Mason } 1798ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1799ac8e9819SChris Mason 1800ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1801ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1802ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1803ac8e9819SChris Mason 180403b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 180503b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 180603b71c6cSGabriel de Perthuis continue; 180703b71c6cSGabriel de Perthuis 180803b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1809ac8e9819SChris Mason item_len = 0; 1810ac8e9819SChris Mason 1811ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1812ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1813ac8e9819SChris Mason ret = 1; 1814ac8e9819SChris Mason goto overflow; 1815ac8e9819SChris Mason } 1816ac8e9819SChris Mason 1817ac8e9819SChris Mason sh.objectid = key->objectid; 1818ac8e9819SChris Mason sh.offset = key->offset; 1819ac8e9819SChris Mason sh.type = key->type; 1820ac8e9819SChris Mason sh.len = item_len; 1821ac8e9819SChris Mason sh.transid = found_transid; 1822ac8e9819SChris Mason 1823ac8e9819SChris Mason /* copy search result header */ 1824ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1825ac8e9819SChris Mason *sk_offset += sizeof(sh); 1826ac8e9819SChris Mason 1827ac8e9819SChris Mason if (item_len) { 1828ac8e9819SChris Mason char *p = buf + *sk_offset; 1829ac8e9819SChris Mason /* copy the item */ 1830ac8e9819SChris Mason read_extent_buffer(leaf, p, 1831ac8e9819SChris Mason item_off, item_len); 1832ac8e9819SChris Mason *sk_offset += item_len; 1833ac8e9819SChris Mason } 1834e2156867SHugo Mills (*num_found)++; 1835ac8e9819SChris Mason 1836ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1837ac8e9819SChris Mason break; 1838ac8e9819SChris Mason } 1839ac8e9819SChris Mason advance_key: 1840ac8e9819SChris Mason ret = 0; 1841abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1842abc6e134SChris Mason key->offset++; 1843abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1844abc6e134SChris Mason key->offset = 0; 1845abc6e134SChris Mason key->type++; 1846abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1847abc6e134SChris Mason key->offset = 0; 1848abc6e134SChris Mason key->type = 0; 1849abc6e134SChris Mason key->objectid++; 1850abc6e134SChris Mason } else 1851abc6e134SChris Mason ret = 1; 1852ac8e9819SChris Mason overflow: 1853ac8e9819SChris Mason return ret; 1854ac8e9819SChris Mason } 1855ac8e9819SChris Mason 1856ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1857ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1858ac8e9819SChris Mason { 1859ac8e9819SChris Mason struct btrfs_root *root; 1860ac8e9819SChris Mason struct btrfs_key key; 1861ac8e9819SChris Mason struct btrfs_key max_key; 1862ac8e9819SChris Mason struct btrfs_path *path; 1863ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1864ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1865ac8e9819SChris Mason int ret; 1866ac8e9819SChris Mason int num_found = 0; 1867ac8e9819SChris Mason unsigned long sk_offset = 0; 1868ac8e9819SChris Mason 1869ac8e9819SChris Mason path = btrfs_alloc_path(); 1870ac8e9819SChris Mason if (!path) 1871ac8e9819SChris Mason return -ENOMEM; 1872ac8e9819SChris Mason 1873ac8e9819SChris Mason if (sk->tree_id == 0) { 1874ac8e9819SChris Mason /* search the root of the inode that was passed */ 1875ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1876ac8e9819SChris Mason } else { 1877ac8e9819SChris Mason key.objectid = sk->tree_id; 1878ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1879ac8e9819SChris Mason key.offset = (u64)-1; 1880ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1881ac8e9819SChris Mason if (IS_ERR(root)) { 1882ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1883ac8e9819SChris Mason sk->tree_id); 1884ac8e9819SChris Mason btrfs_free_path(path); 1885ac8e9819SChris Mason return -ENOENT; 1886ac8e9819SChris Mason } 1887ac8e9819SChris Mason } 1888ac8e9819SChris Mason 1889ac8e9819SChris Mason key.objectid = sk->min_objectid; 1890ac8e9819SChris Mason key.type = sk->min_type; 1891ac8e9819SChris Mason key.offset = sk->min_offset; 1892ac8e9819SChris Mason 1893ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1894ac8e9819SChris Mason max_key.type = sk->max_type; 1895ac8e9819SChris Mason max_key.offset = sk->max_offset; 1896ac8e9819SChris Mason 1897ac8e9819SChris Mason path->keep_locks = 1; 1898ac8e9819SChris Mason 1899ac8e9819SChris Mason while(1) { 1900de78b51aSEric Sandeen ret = btrfs_search_forward(root, &key, &max_key, path, 1901ac8e9819SChris Mason sk->min_transid); 1902ac8e9819SChris Mason if (ret != 0) { 1903ac8e9819SChris Mason if (ret > 0) 1904ac8e9819SChris Mason ret = 0; 1905ac8e9819SChris Mason goto err; 1906ac8e9819SChris Mason } 1907ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1908ac8e9819SChris Mason &sk_offset, &num_found); 1909b3b4aa74SDavid Sterba btrfs_release_path(path); 1910ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1911ac8e9819SChris Mason break; 1912ac8e9819SChris Mason 1913ac8e9819SChris Mason } 1914ac8e9819SChris Mason ret = 0; 1915ac8e9819SChris Mason err: 1916ac8e9819SChris Mason sk->nr_items = num_found; 1917ac8e9819SChris Mason btrfs_free_path(path); 1918ac8e9819SChris Mason return ret; 1919ac8e9819SChris Mason } 1920ac8e9819SChris Mason 1921ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1922ac8e9819SChris Mason void __user *argp) 1923ac8e9819SChris Mason { 1924ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1925ac8e9819SChris Mason struct inode *inode; 1926ac8e9819SChris Mason int ret; 1927ac8e9819SChris Mason 1928ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1929ac8e9819SChris Mason return -EPERM; 1930ac8e9819SChris Mason 19312354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19322354d08fSJulia Lawall if (IS_ERR(args)) 19332354d08fSJulia Lawall return PTR_ERR(args); 1934ac8e9819SChris Mason 1935496ad9aaSAl Viro inode = file_inode(file); 1936ac8e9819SChris Mason ret = search_ioctl(inode, args); 1937ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1938ac8e9819SChris Mason ret = -EFAULT; 1939ac8e9819SChris Mason kfree(args); 1940ac8e9819SChris Mason return ret; 1941ac8e9819SChris Mason } 1942ac8e9819SChris Mason 194398d377a0STARUISI Hiroaki /* 1944ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1945ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 194698d377a0STARUISI Hiroaki */ 194798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 194898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 194998d377a0STARUISI Hiroaki { 195098d377a0STARUISI Hiroaki struct btrfs_root *root; 195198d377a0STARUISI Hiroaki struct btrfs_key key; 1952ac8e9819SChris Mason char *ptr; 195398d377a0STARUISI Hiroaki int ret = -1; 195498d377a0STARUISI Hiroaki int slot; 195598d377a0STARUISI Hiroaki int len; 195698d377a0STARUISI Hiroaki int total_len = 0; 195798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 195898d377a0STARUISI Hiroaki struct extent_buffer *l; 195998d377a0STARUISI Hiroaki struct btrfs_path *path; 196098d377a0STARUISI Hiroaki 196198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 196298d377a0STARUISI Hiroaki name[0]='\0'; 196398d377a0STARUISI Hiroaki return 0; 196498d377a0STARUISI Hiroaki } 196598d377a0STARUISI Hiroaki 196698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 196798d377a0STARUISI Hiroaki if (!path) 196898d377a0STARUISI Hiroaki return -ENOMEM; 196998d377a0STARUISI Hiroaki 1970ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 197198d377a0STARUISI Hiroaki 197298d377a0STARUISI Hiroaki key.objectid = tree_id; 197398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 197498d377a0STARUISI Hiroaki key.offset = (u64)-1; 197598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 197698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 197798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 19788ad6fcabSChris Mason ret = -ENOENT; 19798ad6fcabSChris Mason goto out; 198098d377a0STARUISI Hiroaki } 198198d377a0STARUISI Hiroaki 198298d377a0STARUISI Hiroaki key.objectid = dirid; 198398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 19848ad6fcabSChris Mason key.offset = (u64)-1; 198598d377a0STARUISI Hiroaki 198698d377a0STARUISI Hiroaki while(1) { 198798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 198898d377a0STARUISI Hiroaki if (ret < 0) 198998d377a0STARUISI Hiroaki goto out; 199098d377a0STARUISI Hiroaki 199198d377a0STARUISI Hiroaki l = path->nodes[0]; 199298d377a0STARUISI Hiroaki slot = path->slots[0]; 19938ad6fcabSChris Mason if (ret > 0 && slot > 0) 19948ad6fcabSChris Mason slot--; 199598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 199698d377a0STARUISI Hiroaki 199798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1998ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1999ac8e9819SChris Mason ret = -ENOENT; 200098d377a0STARUISI Hiroaki goto out; 2001ac8e9819SChris Mason } 200298d377a0STARUISI Hiroaki 200398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 200498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 200598d377a0STARUISI Hiroaki ptr -= len + 1; 200698d377a0STARUISI Hiroaki total_len += len + 1; 2007ac8e9819SChris Mason if (ptr < name) 200898d377a0STARUISI Hiroaki goto out; 200998d377a0STARUISI Hiroaki 201098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 201198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 201298d377a0STARUISI Hiroaki 201398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 201498d377a0STARUISI Hiroaki break; 201598d377a0STARUISI Hiroaki 2016b3b4aa74SDavid Sterba btrfs_release_path(path); 201798d377a0STARUISI Hiroaki key.objectid = key.offset; 20188ad6fcabSChris Mason key.offset = (u64)-1; 201998d377a0STARUISI Hiroaki dirid = key.objectid; 202098d377a0STARUISI Hiroaki } 2021ac8e9819SChris Mason if (ptr < name) 202298d377a0STARUISI Hiroaki goto out; 202377906a50SLi Zefan memmove(name, ptr, total_len); 202498d377a0STARUISI Hiroaki name[total_len]='\0'; 202598d377a0STARUISI Hiroaki ret = 0; 202698d377a0STARUISI Hiroaki out: 202798d377a0STARUISI Hiroaki btrfs_free_path(path); 2028ac8e9819SChris Mason return ret; 2029ac8e9819SChris Mason } 2030ac8e9819SChris Mason 2031ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2032ac8e9819SChris Mason void __user *argp) 2033ac8e9819SChris Mason { 2034ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2035ac8e9819SChris Mason struct inode *inode; 2036ac8e9819SChris Mason int ret; 2037ac8e9819SChris Mason 2038ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2039ac8e9819SChris Mason return -EPERM; 2040ac8e9819SChris Mason 20412354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20422354d08fSJulia Lawall if (IS_ERR(args)) 20432354d08fSJulia Lawall return PTR_ERR(args); 2044c2b96929SDan Carpenter 2045496ad9aaSAl Viro inode = file_inode(file); 2046ac8e9819SChris Mason 20471b53ac4dSChris Mason if (args->treeid == 0) 20481b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20491b53ac4dSChris Mason 2050ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2051ac8e9819SChris Mason args->treeid, args->objectid, 2052ac8e9819SChris Mason args->name); 2053ac8e9819SChris Mason 2054ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2055ac8e9819SChris Mason ret = -EFAULT; 2056ac8e9819SChris Mason 2057ac8e9819SChris Mason kfree(args); 205898d377a0STARUISI Hiroaki return ret; 205998d377a0STARUISI Hiroaki } 206098d377a0STARUISI Hiroaki 206176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 206276dda93cSYan, Zheng void __user *arg) 206376dda93cSYan, Zheng { 206476dda93cSYan, Zheng struct dentry *parent = fdentry(file); 206576dda93cSYan, Zheng struct dentry *dentry; 206676dda93cSYan, Zheng struct inode *dir = parent->d_inode; 206776dda93cSYan, Zheng struct inode *inode; 206876dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 206976dda93cSYan, Zheng struct btrfs_root *dest = NULL; 207076dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 207176dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2072c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2073c58aaad2SMiao Xie u64 qgroup_reserved; 207476dda93cSYan, Zheng int namelen; 207576dda93cSYan, Zheng int ret; 207676dda93cSYan, Zheng int err = 0; 207776dda93cSYan, Zheng 207876dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 207976dda93cSYan, Zheng if (IS_ERR(vol_args)) 208076dda93cSYan, Zheng return PTR_ERR(vol_args); 208176dda93cSYan, Zheng 208276dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 208376dda93cSYan, Zheng namelen = strlen(vol_args->name); 208476dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 208576dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 208676dda93cSYan, Zheng err = -EINVAL; 208776dda93cSYan, Zheng goto out; 208876dda93cSYan, Zheng } 208976dda93cSYan, Zheng 2090a561be71SAl Viro err = mnt_want_write_file(file); 209176dda93cSYan, Zheng if (err) 209276dda93cSYan, Zheng goto out; 209376dda93cSYan, Zheng 20945c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 20955c50c9b8SDavid Sterba if (err == -EINTR) 20965c50c9b8SDavid Sterba goto out; 209776dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 209876dda93cSYan, Zheng if (IS_ERR(dentry)) { 209976dda93cSYan, Zheng err = PTR_ERR(dentry); 210076dda93cSYan, Zheng goto out_unlock_dir; 210176dda93cSYan, Zheng } 210276dda93cSYan, Zheng 210376dda93cSYan, Zheng if (!dentry->d_inode) { 210476dda93cSYan, Zheng err = -ENOENT; 210576dda93cSYan, Zheng goto out_dput; 210676dda93cSYan, Zheng } 210776dda93cSYan, Zheng 210876dda93cSYan, Zheng inode = dentry->d_inode; 21094260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21104260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 21114260f7c7SSage Weil /* 21124260f7c7SSage Weil * Regular user. Only allow this with a special mount 21134260f7c7SSage Weil * option, when the user has write+exec access to the 21144260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21154260f7c7SSage Weil * allowed. 21164260f7c7SSage Weil * 21174260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21184260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21194260f7c7SSage Weil * otherwise be able to delete. 21204260f7c7SSage Weil * 21214260f7c7SSage Weil * Users who want to delete empty subvols should try 21224260f7c7SSage Weil * rmdir(2). 21234260f7c7SSage Weil */ 21244260f7c7SSage Weil err = -EPERM; 21254260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21264260f7c7SSage Weil goto out_dput; 21274260f7c7SSage Weil 21284260f7c7SSage Weil /* 21294260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21304260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21314260f7c7SSage Weil * must be called on the dentry referencing the root 21324260f7c7SSage Weil * of the subvol, not a random directory contained 21334260f7c7SSage Weil * within it. 21344260f7c7SSage Weil */ 21354260f7c7SSage Weil err = -EINVAL; 21364260f7c7SSage Weil if (root == dest) 21374260f7c7SSage Weil goto out_dput; 21384260f7c7SSage Weil 21394260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21404260f7c7SSage Weil if (err) 21414260f7c7SSage Weil goto out_dput; 21425c39da5bSMiao Xie } 21434260f7c7SSage Weil 21445c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21454260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21464260f7c7SSage Weil if (err) 21474260f7c7SSage Weil goto out_dput; 21484260f7c7SSage Weil 214933345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 215076dda93cSYan, Zheng err = -EINVAL; 215176dda93cSYan, Zheng goto out_dput; 215276dda93cSYan, Zheng } 215376dda93cSYan, Zheng 215476dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 215576dda93cSYan, Zheng err = d_invalidate(dentry); 215676dda93cSYan, Zheng if (err) 215776dda93cSYan, Zheng goto out_unlock; 215876dda93cSYan, Zheng 215976dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 216076dda93cSYan, Zheng 216176dda93cSYan, Zheng err = may_destroy_subvol(dest); 216276dda93cSYan, Zheng if (err) 216376dda93cSYan, Zheng goto out_up_write; 216476dda93cSYan, Zheng 2165c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2166c58aaad2SMiao Xie /* 2167c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2168c58aaad2SMiao Xie * ref/backref. 2169c58aaad2SMiao Xie */ 2170c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2171c58aaad2SMiao Xie 5, &qgroup_reserved); 2172c58aaad2SMiao Xie if (err) 2173c58aaad2SMiao Xie goto out_up_write; 2174c58aaad2SMiao Xie 2175a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2176a22285a6SYan, Zheng if (IS_ERR(trans)) { 2177a22285a6SYan, Zheng err = PTR_ERR(trans); 2178c58aaad2SMiao Xie goto out_release; 2179a22285a6SYan, Zheng } 2180c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2181c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2182a22285a6SYan, Zheng 218376dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 218476dda93cSYan, Zheng dest->root_key.objectid, 218576dda93cSYan, Zheng dentry->d_name.name, 218676dda93cSYan, Zheng dentry->d_name.len); 218779787eaaSJeff Mahoney if (ret) { 218879787eaaSJeff Mahoney err = ret; 218979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 219079787eaaSJeff Mahoney goto out_end_trans; 219179787eaaSJeff Mahoney } 219276dda93cSYan, Zheng 219376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 219476dda93cSYan, Zheng 219576dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 219676dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 219776dda93cSYan, Zheng dest->root_item.drop_level = 0; 219876dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 219976dda93cSYan, Zheng 2200d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 220176dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 220276dda93cSYan, Zheng root->fs_info->tree_root, 220376dda93cSYan, Zheng dest->root_key.objectid); 220479787eaaSJeff Mahoney if (ret) { 220579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 220679787eaaSJeff Mahoney err = ret; 220779787eaaSJeff Mahoney goto out_end_trans; 2208d68fc57bSYan, Zheng } 220979787eaaSJeff Mahoney } 221079787eaaSJeff Mahoney out_end_trans: 2211c58aaad2SMiao Xie trans->block_rsv = NULL; 2212c58aaad2SMiao Xie trans->bytes_reserved = 0; 2213531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 221479787eaaSJeff Mahoney if (ret && !err) 221579787eaaSJeff Mahoney err = ret; 221676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2217c58aaad2SMiao Xie out_release: 2218c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 221976dda93cSYan, Zheng out_up_write: 222076dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 222176dda93cSYan, Zheng out_unlock: 222276dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 222376dda93cSYan, Zheng if (!err) { 2224efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 222576dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 222676dda93cSYan, Zheng d_delete(dentry); 2227fa6ac876SLiu Bo 2228fa6ac876SLiu Bo /* the last ref */ 2229fa6ac876SLiu Bo if (dest->cache_inode) { 2230fa6ac876SLiu Bo iput(dest->cache_inode); 2231fa6ac876SLiu Bo dest->cache_inode = NULL; 2232fa6ac876SLiu Bo } 223376dda93cSYan, Zheng } 223476dda93cSYan, Zheng out_dput: 223576dda93cSYan, Zheng dput(dentry); 223676dda93cSYan, Zheng out_unlock_dir: 223776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 22382a79f17eSAl Viro mnt_drop_write_file(file); 223976dda93cSYan, Zheng out: 224076dda93cSYan, Zheng kfree(vol_args); 224176dda93cSYan, Zheng return err; 224276dda93cSYan, Zheng } 224376dda93cSYan, Zheng 22441e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2245f46b5a66SChristoph Hellwig { 2246496ad9aaSAl Viro struct inode *inode = file_inode(file); 2247f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22481e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2249c146afadSYan Zheng int ret; 2250c146afadSYan Zheng 225125122d15SIlya Dryomov ret = mnt_want_write_file(file); 225225122d15SIlya Dryomov if (ret) 225325122d15SIlya Dryomov return ret; 2254b83cc969SLi Zefan 225525122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 225625122d15SIlya Dryomov ret = -EROFS; 225725122d15SIlya Dryomov goto out; 22585ac00addSStefan Behrens } 2259f46b5a66SChristoph Hellwig 2260f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2261f46b5a66SChristoph Hellwig case S_IFDIR: 2262e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2263e441d54dSChris Mason ret = -EPERM; 2264e441d54dSChris Mason goto out; 2265e441d54dSChris Mason } 2266de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 22678929ecfaSYan, Zheng if (ret) 22688929ecfaSYan, Zheng goto out; 2269de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2270f46b5a66SChristoph Hellwig break; 2271f46b5a66SChristoph Hellwig case S_IFREG: 2272e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2273e441d54dSChris Mason ret = -EINVAL; 2274e441d54dSChris Mason goto out; 2275e441d54dSChris Mason } 22761e701a32SChris Mason 22771e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 22781e701a32SChris Mason if (!range) { 22791e701a32SChris Mason ret = -ENOMEM; 22801e701a32SChris Mason goto out; 22811e701a32SChris Mason } 22821e701a32SChris Mason 22831e701a32SChris Mason if (argp) { 22841e701a32SChris Mason if (copy_from_user(range, argp, 22851e701a32SChris Mason sizeof(*range))) { 22861e701a32SChris Mason ret = -EFAULT; 22871e701a32SChris Mason kfree(range); 2288683be16eSDan Carpenter goto out; 22891e701a32SChris Mason } 22901e701a32SChris Mason /* compression requires us to start the IO */ 22911e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 22921e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 22931e701a32SChris Mason range->extent_thresh = (u32)-1; 22941e701a32SChris Mason } 22951e701a32SChris Mason } else { 22961e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 22971e701a32SChris Mason range->len = (u64)-1; 22981e701a32SChris Mason } 2299496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23004cb5300bSChris Mason range, 0, 0); 23014cb5300bSChris Mason if (ret > 0) 23024cb5300bSChris Mason ret = 0; 23031e701a32SChris Mason kfree(range); 2304f46b5a66SChristoph Hellwig break; 23058929ecfaSYan, Zheng default: 23068929ecfaSYan, Zheng ret = -EINVAL; 2307f46b5a66SChristoph Hellwig } 2308e441d54dSChris Mason out: 230925122d15SIlya Dryomov mnt_drop_write_file(file); 2310e441d54dSChris Mason return ret; 2311f46b5a66SChristoph Hellwig } 2312f46b5a66SChristoph Hellwig 2313b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2314f46b5a66SChristoph Hellwig { 2315f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2316f46b5a66SChristoph Hellwig int ret; 2317f46b5a66SChristoph Hellwig 2318e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2319e441d54dSChris Mason return -EPERM; 2320e441d54dSChris Mason 23215ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23225ac00addSStefan Behrens 1)) { 23235ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 23242c0c9da0SIlya Dryomov return -EINVAL; 2325c9e9f97bSIlya Dryomov } 2326c9e9f97bSIlya Dryomov 23275ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2328dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2329c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2330c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2331c9e9f97bSIlya Dryomov goto out; 2332c9e9f97bSIlya Dryomov } 2333f46b5a66SChristoph Hellwig 23345516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2335f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2336f46b5a66SChristoph Hellwig 2337f46b5a66SChristoph Hellwig kfree(vol_args); 2338c9e9f97bSIlya Dryomov out: 2339c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23405ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2341f46b5a66SChristoph Hellwig return ret; 2342f46b5a66SChristoph Hellwig } 2343f46b5a66SChristoph Hellwig 2344da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2345f46b5a66SChristoph Hellwig { 2346496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2347f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2348f46b5a66SChristoph Hellwig int ret; 2349f46b5a66SChristoph Hellwig 2350e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2351e441d54dSChris Mason return -EPERM; 2352e441d54dSChris Mason 2353da24927bSMiao Xie ret = mnt_want_write_file(file); 2354da24927bSMiao Xie if (ret) 2355da24927bSMiao Xie return ret; 2356c146afadSYan Zheng 23575ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23585ac00addSStefan Behrens 1)) { 23595ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 2360da24927bSMiao Xie mnt_drop_write_file(file); 23612c0c9da0SIlya Dryomov return -EINVAL; 2362c9e9f97bSIlya Dryomov } 2363c9e9f97bSIlya Dryomov 23645ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2365dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2366c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2367c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2368c9e9f97bSIlya Dryomov goto out; 2369c9e9f97bSIlya Dryomov } 2370f46b5a66SChristoph Hellwig 23715516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2372f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2373f46b5a66SChristoph Hellwig 2374f46b5a66SChristoph Hellwig kfree(vol_args); 2375c9e9f97bSIlya Dryomov out: 2376c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23775ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 23784ac20c70SIlya Dryomov mnt_drop_write_file(file); 2379f46b5a66SChristoph Hellwig return ret; 2380f46b5a66SChristoph Hellwig } 2381f46b5a66SChristoph Hellwig 2382475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2383475f6387SJan Schmidt { 2384027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2385475f6387SJan Schmidt struct btrfs_device *device; 2386475f6387SJan Schmidt struct btrfs_device *next; 2387475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2388027ed2f0SLi Zefan int ret = 0; 2389475f6387SJan Schmidt 2390475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2391475f6387SJan Schmidt return -EPERM; 2392475f6387SJan Schmidt 2393027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2394027ed2f0SLi Zefan if (!fi_args) 2395027ed2f0SLi Zefan return -ENOMEM; 2396027ed2f0SLi Zefan 2397027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2398027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2399475f6387SJan Schmidt 2400475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2401475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2402027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2403027ed2f0SLi Zefan fi_args->max_id = device->devid; 2404475f6387SJan Schmidt } 2405475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2406475f6387SJan Schmidt 2407027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2408027ed2f0SLi Zefan ret = -EFAULT; 2409475f6387SJan Schmidt 2410027ed2f0SLi Zefan kfree(fi_args); 2411027ed2f0SLi Zefan return ret; 2412475f6387SJan Schmidt } 2413475f6387SJan Schmidt 2414475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2415475f6387SJan Schmidt { 2416475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2417475f6387SJan Schmidt struct btrfs_device *dev; 2418475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2419475f6387SJan Schmidt int ret = 0; 2420475f6387SJan Schmidt char *s_uuid = NULL; 2421475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2422475f6387SJan Schmidt 2423475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2424475f6387SJan Schmidt return -EPERM; 2425475f6387SJan Schmidt 2426475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2427475f6387SJan Schmidt if (IS_ERR(di_args)) 2428475f6387SJan Schmidt return PTR_ERR(di_args); 2429475f6387SJan Schmidt 2430475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2431475f6387SJan Schmidt s_uuid = di_args->uuid; 2432475f6387SJan Schmidt 2433475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2434aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2435475f6387SJan Schmidt 2436475f6387SJan Schmidt if (!dev) { 2437475f6387SJan Schmidt ret = -ENODEV; 2438475f6387SJan Schmidt goto out; 2439475f6387SJan Schmidt } 2440475f6387SJan Schmidt 2441475f6387SJan Schmidt di_args->devid = dev->devid; 2442475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2443475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2444475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2445a27202fbSJim Meyering if (dev->name) { 2446606686eeSJosef Bacik struct rcu_string *name; 2447606686eeSJosef Bacik 2448606686eeSJosef Bacik rcu_read_lock(); 2449606686eeSJosef Bacik name = rcu_dereference(dev->name); 2450606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2451606686eeSJosef Bacik rcu_read_unlock(); 2452a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2453a27202fbSJim Meyering } else { 245499ba55adSStefan Behrens di_args->path[0] = '\0'; 2455a27202fbSJim Meyering } 2456475f6387SJan Schmidt 2457475f6387SJan Schmidt out: 245855793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2459475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2460475f6387SJan Schmidt ret = -EFAULT; 2461475f6387SJan Schmidt 2462475f6387SJan Schmidt kfree(di_args); 2463475f6387SJan Schmidt return ret; 2464475f6387SJan Schmidt } 2465475f6387SJan Schmidt 246676dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2467b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2468f46b5a66SChristoph Hellwig { 2469496ad9aaSAl Viro struct inode *inode = file_inode(file); 2470f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 24712903ff01SAl Viro struct fd src_file; 2472f46b5a66SChristoph Hellwig struct inode *src; 2473f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2474f46b5a66SChristoph Hellwig struct btrfs_path *path; 2475f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2476ae01a0abSYan Zheng char *buf; 2477ae01a0abSYan Zheng struct btrfs_key key; 2478f46b5a66SChristoph Hellwig u32 nritems; 2479f46b5a66SChristoph Hellwig int slot; 2480ae01a0abSYan Zheng int ret; 2481c5c9cd4dSSage Weil u64 len = olen; 2482c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2483d20f7043SChris Mason 2484c5c9cd4dSSage Weil /* 2485c5c9cd4dSSage Weil * TODO: 2486c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2487c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2488c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2489c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2490c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2491c5c9cd4dSSage Weil * they don't overlap)? 2492c5c9cd4dSSage Weil */ 2493c5c9cd4dSSage Weil 2494e441d54dSChris Mason /* the destination must be opened for writing */ 24952ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2496e441d54dSChris Mason return -EINVAL; 2497e441d54dSChris Mason 2498b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2499b83cc969SLi Zefan return -EROFS; 2500b83cc969SLi Zefan 2501a561be71SAl Viro ret = mnt_want_write_file(file); 2502c146afadSYan Zheng if (ret) 2503c146afadSYan Zheng return ret; 2504c146afadSYan Zheng 25052903ff01SAl Viro src_file = fdget(srcfd); 25062903ff01SAl Viro if (!src_file.file) { 2507ab67b7c1SYan Zheng ret = -EBADF; 2508ab67b7c1SYan Zheng goto out_drop_write; 2509ab67b7c1SYan Zheng } 25105dc64164SDan Rosenberg 2511362a20c5SDavid Sterba ret = -EXDEV; 25122903ff01SAl Viro if (src_file.file->f_path.mnt != file->f_path.mnt) 2513362a20c5SDavid Sterba goto out_fput; 2514362a20c5SDavid Sterba 2515496ad9aaSAl Viro src = file_inode(src_file.file); 2516f46b5a66SChristoph Hellwig 2517c5c9cd4dSSage Weil ret = -EINVAL; 2518c5c9cd4dSSage Weil if (src == inode) 2519c5c9cd4dSSage Weil goto out_fput; 2520c5c9cd4dSSage Weil 25215dc64164SDan Rosenberg /* the src must be open for reading */ 25222903ff01SAl Viro if (!(src_file.file->f_mode & FMODE_READ)) 25235dc64164SDan Rosenberg goto out_fput; 25245dc64164SDan Rosenberg 25250e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 25260e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 25270e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 25280e7b824cSLi Zefan goto out_fput; 25290e7b824cSLi Zefan 2530ae01a0abSYan Zheng ret = -EISDIR; 2531ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2532f46b5a66SChristoph Hellwig goto out_fput; 2533f46b5a66SChristoph Hellwig 2534ae01a0abSYan Zheng ret = -EXDEV; 2535362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2536ae01a0abSYan Zheng goto out_fput; 2537ae01a0abSYan Zheng 2538ae01a0abSYan Zheng ret = -ENOMEM; 2539ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2540ae01a0abSYan Zheng if (!buf) 2541ae01a0abSYan Zheng goto out_fput; 2542ae01a0abSYan Zheng 2543ae01a0abSYan Zheng path = btrfs_alloc_path(); 2544ae01a0abSYan Zheng if (!path) { 2545ae01a0abSYan Zheng vfree(buf); 2546ae01a0abSYan Zheng goto out_fput; 2547ae01a0abSYan Zheng } 2548ae01a0abSYan Zheng path->reada = 2; 2549ae01a0abSYan Zheng 2550f46b5a66SChristoph Hellwig if (inode < src) { 2551fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2552fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2553f46b5a66SChristoph Hellwig } else { 2554fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2555fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2556f46b5a66SChristoph Hellwig } 2557f46b5a66SChristoph Hellwig 2558c5c9cd4dSSage Weil /* determine range to clone */ 2559c5c9cd4dSSage Weil ret = -EINVAL; 25602ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2561f46b5a66SChristoph Hellwig goto out_unlock; 2562c5c9cd4dSSage Weil if (len == 0) 2563c5c9cd4dSSage Weil olen = len = src->i_size - off; 2564c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2565c5c9cd4dSSage Weil if (off + len == src->i_size) 25662a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2567c5c9cd4dSSage Weil 2568c5c9cd4dSSage Weil /* verify the end result is block aligned */ 25692a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 25702a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2571c5c9cd4dSSage Weil goto out_unlock; 2572c5c9cd4dSSage Weil 2573d525e8abSLi Zefan if (destoff > inode->i_size) { 2574d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2575d525e8abSLi Zefan if (ret) 2576d525e8abSLi Zefan goto out_unlock; 2577d525e8abSLi Zefan } 2578d525e8abSLi Zefan 257971ef0786SLi Zefan /* truncate page cache pages from target inode range */ 258071ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 258171ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 258271ef0786SLi Zefan 2583f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2584f46b5a66SChristoph Hellwig another, and lock file content */ 2585f46b5a66SChristoph Hellwig while (1) { 258631840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2587aa42ffd9SLiu Bo lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2588aa42ffd9SLiu Bo ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); 25899a019196SSage Weil if (!ordered && 2590aa42ffd9SLiu Bo !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, 25919a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2592f46b5a66SChristoph Hellwig break; 2593aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2594ae01a0abSYan Zheng if (ordered) 2595ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 25969a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2597f46b5a66SChristoph Hellwig } 2598f46b5a66SChristoph Hellwig 2599c5c9cd4dSSage Weil /* clone data */ 260033345d01SLi Zefan key.objectid = btrfs_ino(src); 2601ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2602ae01a0abSYan Zheng key.offset = 0; 2603f46b5a66SChristoph Hellwig 2604f46b5a66SChristoph Hellwig while (1) { 2605f46b5a66SChristoph Hellwig /* 2606f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2607f46b5a66SChristoph Hellwig * tree. 2608f46b5a66SChristoph Hellwig */ 2609362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2610362a20c5SDavid Sterba 0, 0); 2611f46b5a66SChristoph Hellwig if (ret < 0) 2612f46b5a66SChristoph Hellwig goto out; 2613f46b5a66SChristoph Hellwig 2614ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2615ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2616362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2617f46b5a66SChristoph Hellwig if (ret < 0) 2618f46b5a66SChristoph Hellwig goto out; 2619f46b5a66SChristoph Hellwig if (ret > 0) 2620f46b5a66SChristoph Hellwig break; 2621ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2622f46b5a66SChristoph Hellwig } 2623f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2624f46b5a66SChristoph Hellwig slot = path->slots[0]; 2625f46b5a66SChristoph Hellwig 2626ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2627d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 262833345d01SLi Zefan key.objectid != btrfs_ino(src)) 2629f46b5a66SChristoph Hellwig break; 2630f46b5a66SChristoph Hellwig 2631c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2632c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2633c5c9cd4dSSage Weil int type; 263431840ae1SZheng Yan u32 size; 263531840ae1SZheng Yan struct btrfs_key new_key; 2636c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2637c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2638c5c9cd4dSSage Weil u8 comp; 2639b5384d48SSage Weil u64 endoff; 264031840ae1SZheng Yan 264131840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 264231840ae1SZheng Yan read_extent_buffer(leaf, buf, 264331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 264431840ae1SZheng Yan size); 2645c5c9cd4dSSage Weil 2646c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2647c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2648c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2649c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2650c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2651c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2652d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2653d397712bSChris Mason extent); 2654d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2655d397712bSChris Mason extent); 2656c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2657d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2658d397712bSChris Mason extent); 2659c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2660c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2661c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2662c5c9cd4dSSage Weil extent); 2663c5c9cd4dSSage Weil } 2664b3b4aa74SDavid Sterba btrfs_release_path(path); 266531840ae1SZheng Yan 2666050006a7SSage Weil if (key.offset + datal <= off || 2667aa42ffd9SLiu Bo key.offset >= off + len - 1) 2668c5c9cd4dSSage Weil goto next; 2669c5c9cd4dSSage Weil 267031840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 267133345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 26724d728ec7SLi Zefan if (off <= key.offset) 2673c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 26744d728ec7SLi Zefan else 26754d728ec7SLi Zefan new_key.offset = destoff; 2676c5c9cd4dSSage Weil 2677b6f3409bSSage Weil /* 2678b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2679b6f3409bSSage Weil * 1 - add new extent 2680b6f3409bSSage Weil * 1 - inode update 2681b6f3409bSSage Weil */ 2682b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2683a22285a6SYan, Zheng if (IS_ERR(trans)) { 2684a22285a6SYan, Zheng ret = PTR_ERR(trans); 2685a22285a6SYan, Zheng goto out; 2686a22285a6SYan, Zheng } 2687a22285a6SYan, Zheng 2688c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2689c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2690d72c0842SLi Zefan /* 2691d72c0842SLi Zefan * a | --- range to clone ---| b 2692d72c0842SLi Zefan * | ------------- extent ------------- | 2693d72c0842SLi Zefan */ 2694d72c0842SLi Zefan 2695d72c0842SLi Zefan /* substract range b */ 2696d72c0842SLi Zefan if (key.offset + datal > off + len) 2697d72c0842SLi Zefan datal = off + len - key.offset; 2698d72c0842SLi Zefan 2699d72c0842SLi Zefan /* substract range a */ 2700a22285a6SYan, Zheng if (off > key.offset) { 2701a22285a6SYan, Zheng datao += off - key.offset; 2702a22285a6SYan, Zheng datal -= off - key.offset; 2703a22285a6SYan, Zheng } 2704a22285a6SYan, Zheng 27055dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2706a22285a6SYan, Zheng new_key.offset, 2707a22285a6SYan, Zheng new_key.offset + datal, 27082671485dSJosef Bacik 1); 270979787eaaSJeff Mahoney if (ret) { 271079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 271179787eaaSJeff Mahoney ret); 271279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 271379787eaaSJeff Mahoney goto out; 271479787eaaSJeff Mahoney } 2715a22285a6SYan, Zheng 271631840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 271731840ae1SZheng Yan &new_key, size); 271879787eaaSJeff Mahoney if (ret) { 271979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 272079787eaaSJeff Mahoney ret); 272179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 272279787eaaSJeff Mahoney goto out; 272379787eaaSJeff Mahoney } 272431840ae1SZheng Yan 272531840ae1SZheng Yan leaf = path->nodes[0]; 272631840ae1SZheng Yan slot = path->slots[0]; 272731840ae1SZheng Yan write_extent_buffer(leaf, buf, 272831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 272931840ae1SZheng Yan size); 2730ae01a0abSYan Zheng 2731f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2732f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2733c5c9cd4dSSage Weil 2734c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2735c5c9cd4dSSage Weil if (!disko) 2736c5c9cd4dSSage Weil datao = 0; 2737c5c9cd4dSSage Weil 2738c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2739c5c9cd4dSSage Weil datao); 2740c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2741c5c9cd4dSSage Weil datal); 2742c5c9cd4dSSage Weil if (disko) { 2743c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2744ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 27455d4f98a2SYan Zheng disko, diskl, 0, 2746f46b5a66SChristoph Hellwig root->root_key.objectid, 274733345d01SLi Zefan btrfs_ino(inode), 274866d7e7f0SArne Jansen new_key.offset - datao, 274966d7e7f0SArne Jansen 0); 275079787eaaSJeff Mahoney if (ret) { 275179787eaaSJeff Mahoney btrfs_abort_transaction(trans, 275279787eaaSJeff Mahoney root, 275379787eaaSJeff Mahoney ret); 275479787eaaSJeff Mahoney btrfs_end_transaction(trans, 275579787eaaSJeff Mahoney root); 275679787eaaSJeff Mahoney goto out; 275779787eaaSJeff Mahoney 275879787eaaSJeff Mahoney } 2759f46b5a66SChristoph Hellwig } 2760c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2761c5c9cd4dSSage Weil u64 skip = 0; 2762c5c9cd4dSSage Weil u64 trim = 0; 2763c5c9cd4dSSage Weil if (off > key.offset) { 2764c5c9cd4dSSage Weil skip = off - key.offset; 2765c5c9cd4dSSage Weil new_key.offset += skip; 276631840ae1SZheng Yan } 2767d397712bSChris Mason 2768c5c9cd4dSSage Weil if (key.offset + datal > off + len) 2769c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 2770d397712bSChris Mason 2771c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2772c5c9cd4dSSage Weil ret = -EINVAL; 2773a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2774c5c9cd4dSSage Weil goto out; 277531840ae1SZheng Yan } 2776c5c9cd4dSSage Weil size -= skip + trim; 2777c5c9cd4dSSage Weil datal -= skip + trim; 2778a22285a6SYan, Zheng 27795dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2780a22285a6SYan, Zheng new_key.offset, 2781a22285a6SYan, Zheng new_key.offset + datal, 27822671485dSJosef Bacik 1); 278379787eaaSJeff Mahoney if (ret) { 278479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 278579787eaaSJeff Mahoney ret); 278679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 278779787eaaSJeff Mahoney goto out; 278879787eaaSJeff Mahoney } 2789a22285a6SYan, Zheng 2790c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2791c5c9cd4dSSage Weil &new_key, size); 279279787eaaSJeff Mahoney if (ret) { 279379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 279479787eaaSJeff Mahoney ret); 279579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 279679787eaaSJeff Mahoney goto out; 279779787eaaSJeff Mahoney } 2798c5c9cd4dSSage Weil 2799c5c9cd4dSSage Weil if (skip) { 2800d397712bSChris Mason u32 start = 2801d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2802c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2803c5c9cd4dSSage Weil datal); 2804c5c9cd4dSSage Weil } 2805c5c9cd4dSSage Weil 2806c5c9cd4dSSage Weil leaf = path->nodes[0]; 2807c5c9cd4dSSage Weil slot = path->slots[0]; 2808c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2809c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2810c5c9cd4dSSage Weil size); 2811c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2812c5c9cd4dSSage Weil } 2813c5c9cd4dSSage Weil 2814c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2815b3b4aa74SDavid Sterba btrfs_release_path(path); 2816c5c9cd4dSSage Weil 28170c4d2d95SJosef Bacik inode_inc_iversion(inode); 2818a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2819b5384d48SSage Weil 2820b5384d48SSage Weil /* 2821b5384d48SSage Weil * we round up to the block size at eof when 2822b5384d48SSage Weil * determining which extents to clone above, 2823b5384d48SSage Weil * but shouldn't round up the file size 2824b5384d48SSage Weil */ 2825b5384d48SSage Weil endoff = new_key.offset + datal; 28265f3888ffSLi Zefan if (endoff > destoff+olen) 28275f3888ffSLi Zefan endoff = destoff+olen; 2828b5384d48SSage Weil if (endoff > inode->i_size) 2829b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2830b5384d48SSage Weil 2831a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 283279787eaaSJeff Mahoney if (ret) { 283379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2834a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 283579787eaaSJeff Mahoney goto out; 283679787eaaSJeff Mahoney } 283779787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2838a22285a6SYan, Zheng } 2839c5c9cd4dSSage Weil next: 2840b3b4aa74SDavid Sterba btrfs_release_path(path); 2841ae01a0abSYan Zheng key.offset++; 2842ae01a0abSYan Zheng } 2843f46b5a66SChristoph Hellwig ret = 0; 2844f46b5a66SChristoph Hellwig out: 2845b3b4aa74SDavid Sterba btrfs_release_path(path); 2846aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2847f46b5a66SChristoph Hellwig out_unlock: 2848f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2849f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2850ae01a0abSYan Zheng vfree(buf); 2851ae01a0abSYan Zheng btrfs_free_path(path); 2852f46b5a66SChristoph Hellwig out_fput: 28532903ff01SAl Viro fdput(src_file); 2854ab67b7c1SYan Zheng out_drop_write: 28552a79f17eSAl Viro mnt_drop_write_file(file); 2856f46b5a66SChristoph Hellwig return ret; 2857f46b5a66SChristoph Hellwig } 2858f46b5a66SChristoph Hellwig 28597a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2860c5c9cd4dSSage Weil { 2861c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2862c5c9cd4dSSage Weil 28637a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2864c5c9cd4dSSage Weil return -EFAULT; 2865c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2866c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2867c5c9cd4dSSage Weil } 2868c5c9cd4dSSage Weil 2869f46b5a66SChristoph Hellwig /* 2870f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2871f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2872f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2873f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2874f46b5a66SChristoph Hellwig */ 2875b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2876f46b5a66SChristoph Hellwig { 2877496ad9aaSAl Viro struct inode *inode = file_inode(file); 2878f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2879f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 28801ab86aedSSage Weil int ret; 2881f46b5a66SChristoph Hellwig 28821ab86aedSSage Weil ret = -EPERM; 2883df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2884f46b5a66SChristoph Hellwig goto out; 28851ab86aedSSage Weil 28861ab86aedSSage Weil ret = -EINPROGRESS; 28871ab86aedSSage Weil if (file->private_data) 28881ab86aedSSage Weil goto out; 28899ca9ee09SSage Weil 2890b83cc969SLi Zefan ret = -EROFS; 2891b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2892b83cc969SLi Zefan goto out; 2893b83cc969SLi Zefan 2894a561be71SAl Viro ret = mnt_want_write_file(file); 2895c146afadSYan Zheng if (ret) 2896c146afadSYan Zheng goto out; 2897c146afadSYan Zheng 2898a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 28999ca9ee09SSage Weil 2900f46b5a66SChristoph Hellwig ret = -ENOMEM; 29017a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2902abd30bb0STsutomu Itoh if (IS_ERR(trans)) 29031ab86aedSSage Weil goto out_drop; 29041ab86aedSSage Weil 29051ab86aedSSage Weil file->private_data = trans; 29061ab86aedSSage Weil return 0; 29071ab86aedSSage Weil 29081ab86aedSSage Weil out_drop: 2909a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29102a79f17eSAl Viro mnt_drop_write_file(file); 2911f46b5a66SChristoph Hellwig out: 2912f46b5a66SChristoph Hellwig return ret; 2913f46b5a66SChristoph Hellwig } 2914f46b5a66SChristoph Hellwig 29156ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 29166ef5ed0dSJosef Bacik { 2917496ad9aaSAl Viro struct inode *inode = file_inode(file); 29186ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 29196ef5ed0dSJosef Bacik struct btrfs_root *new_root; 29206ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 29216ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 29226ef5ed0dSJosef Bacik struct btrfs_path *path; 29236ef5ed0dSJosef Bacik struct btrfs_key location; 29246ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 29256ef5ed0dSJosef Bacik u64 objectid = 0; 29266ef5ed0dSJosef Bacik u64 dir_id; 29273c04ce01SMiao Xie int ret; 29286ef5ed0dSJosef Bacik 29296ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 29306ef5ed0dSJosef Bacik return -EPERM; 29316ef5ed0dSJosef Bacik 29323c04ce01SMiao Xie ret = mnt_want_write_file(file); 29333c04ce01SMiao Xie if (ret) 29343c04ce01SMiao Xie return ret; 29353c04ce01SMiao Xie 29363c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29373c04ce01SMiao Xie ret = -EFAULT; 29383c04ce01SMiao Xie goto out; 29393c04ce01SMiao Xie } 29406ef5ed0dSJosef Bacik 29416ef5ed0dSJosef Bacik if (!objectid) 29426ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 29436ef5ed0dSJosef Bacik 29446ef5ed0dSJosef Bacik location.objectid = objectid; 29456ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 29466ef5ed0dSJosef Bacik location.offset = (u64)-1; 29476ef5ed0dSJosef Bacik 29486ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 29493c04ce01SMiao Xie if (IS_ERR(new_root)) { 29503c04ce01SMiao Xie ret = PTR_ERR(new_root); 29513c04ce01SMiao Xie goto out; 29523c04ce01SMiao Xie } 29536ef5ed0dSJosef Bacik 29543c04ce01SMiao Xie if (btrfs_root_refs(&new_root->root_item) == 0) { 29553c04ce01SMiao Xie ret = -ENOENT; 29563c04ce01SMiao Xie goto out; 29573c04ce01SMiao Xie } 29586ef5ed0dSJosef Bacik 29596ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29603c04ce01SMiao Xie if (!path) { 29613c04ce01SMiao Xie ret = -ENOMEM; 29623c04ce01SMiao Xie goto out; 29633c04ce01SMiao Xie } 29646ef5ed0dSJosef Bacik path->leave_spinning = 1; 29656ef5ed0dSJosef Bacik 29666ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 296798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29686ef5ed0dSJosef Bacik btrfs_free_path(path); 29693c04ce01SMiao Xie ret = PTR_ERR(trans); 29703c04ce01SMiao Xie goto out; 29716ef5ed0dSJosef Bacik } 29726ef5ed0dSJosef Bacik 29736c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 29746ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 29756ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2976cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29776ef5ed0dSJosef Bacik btrfs_free_path(path); 29786ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29796ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 29806ef5ed0dSJosef Bacik "this isn't going to work\n"); 29813c04ce01SMiao Xie ret = -ENOENT; 29823c04ce01SMiao Xie goto out; 29836ef5ed0dSJosef Bacik } 29846ef5ed0dSJosef Bacik 29856ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29866ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29876ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29886ef5ed0dSJosef Bacik btrfs_free_path(path); 29896ef5ed0dSJosef Bacik 29902b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 29916ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29923c04ce01SMiao Xie out: 29933c04ce01SMiao Xie mnt_drop_write_file(file); 29943c04ce01SMiao Xie return ret; 29956ef5ed0dSJosef Bacik } 29966ef5ed0dSJosef Bacik 29975af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 2998bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2999bf5fc093SJosef Bacik { 3000bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3001bf5fc093SJosef Bacik 3002bf5fc093SJosef Bacik space->total_bytes = 0; 3003bf5fc093SJosef Bacik space->used_bytes = 0; 3004bf5fc093SJosef Bacik space->flags = 0; 3005bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3006bf5fc093SJosef Bacik space->flags = block_group->flags; 3007bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3008bf5fc093SJosef Bacik space->used_bytes += 3009bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3010bf5fc093SJosef Bacik } 3011bf5fc093SJosef Bacik } 3012bf5fc093SJosef Bacik 301348a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 30141406e432SJosef Bacik { 30151406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 30161406e432SJosef Bacik struct btrfs_ioctl_space_info space; 30171406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 30187fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 301913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 30201406e432SJosef Bacik struct btrfs_space_info *info; 3021bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3022bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3023bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3024bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3025bf5fc093SJosef Bacik int num_types = 4; 30267fde62bfSChris Mason int alloc_size; 30271406e432SJosef Bacik int ret = 0; 302851788b1bSDan Rosenberg u64 slot_count = 0; 3029bf5fc093SJosef Bacik int i, c; 30301406e432SJosef Bacik 30311406e432SJosef Bacik if (copy_from_user(&space_args, 30321406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 30331406e432SJosef Bacik sizeof(space_args))) 30341406e432SJosef Bacik return -EFAULT; 30351406e432SJosef Bacik 3036bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3037bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3038bf5fc093SJosef Bacik 3039bf5fc093SJosef Bacik info = NULL; 30407fde62bfSChris Mason rcu_read_lock(); 3041bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3042bf5fc093SJosef Bacik list) { 3043bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3044bf5fc093SJosef Bacik info = tmp; 3045bf5fc093SJosef Bacik break; 3046bf5fc093SJosef Bacik } 3047bf5fc093SJosef Bacik } 30487fde62bfSChris Mason rcu_read_unlock(); 30491406e432SJosef Bacik 3050bf5fc093SJosef Bacik if (!info) 3051bf5fc093SJosef Bacik continue; 3052bf5fc093SJosef Bacik 3053bf5fc093SJosef Bacik down_read(&info->groups_sem); 3054bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3055bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3056bf5fc093SJosef Bacik slot_count++; 3057bf5fc093SJosef Bacik } 3058bf5fc093SJosef Bacik up_read(&info->groups_sem); 3059bf5fc093SJosef Bacik } 3060bf5fc093SJosef Bacik 30617fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30627fde62bfSChris Mason if (space_args.space_slots == 0) { 30637fde62bfSChris Mason space_args.total_spaces = slot_count; 30647fde62bfSChris Mason goto out; 30657fde62bfSChris Mason } 3066bf5fc093SJosef Bacik 306751788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3068bf5fc093SJosef Bacik 30697fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3070bf5fc093SJosef Bacik 30717fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30727fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30737fde62bfSChris Mason */ 30747fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 30757fde62bfSChris Mason return -ENOMEM; 30767fde62bfSChris Mason 30777fde62bfSChris Mason space_args.total_spaces = 0; 30787fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 30797fde62bfSChris Mason if (!dest) 30807fde62bfSChris Mason return -ENOMEM; 30817fde62bfSChris Mason dest_orig = dest; 30827fde62bfSChris Mason 30837fde62bfSChris Mason /* now we have a buffer to copy into */ 3084bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3085bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3086bf5fc093SJosef Bacik 308751788b1bSDan Rosenberg if (!slot_count) 308851788b1bSDan Rosenberg break; 308951788b1bSDan Rosenberg 3090bf5fc093SJosef Bacik info = NULL; 30911406e432SJosef Bacik rcu_read_lock(); 3092bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3093bf5fc093SJosef Bacik list) { 3094bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3095bf5fc093SJosef Bacik info = tmp; 30967fde62bfSChris Mason break; 3097bf5fc093SJosef Bacik } 3098bf5fc093SJosef Bacik } 3099bf5fc093SJosef Bacik rcu_read_unlock(); 31007fde62bfSChris Mason 3101bf5fc093SJosef Bacik if (!info) 3102bf5fc093SJosef Bacik continue; 3103bf5fc093SJosef Bacik down_read(&info->groups_sem); 3104bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3105bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 31065af3e8ccSStefan Behrens btrfs_get_block_group_info( 31075af3e8ccSStefan Behrens &info->block_groups[c], &space); 31087fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 31091406e432SJosef Bacik dest++; 31101406e432SJosef Bacik space_args.total_spaces++; 311151788b1bSDan Rosenberg slot_count--; 31121406e432SJosef Bacik } 311351788b1bSDan Rosenberg if (!slot_count) 311451788b1bSDan Rosenberg break; 3115bf5fc093SJosef Bacik } 3116bf5fc093SJosef Bacik up_read(&info->groups_sem); 3117bf5fc093SJosef Bacik } 31181406e432SJosef Bacik 31192eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 31207fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 31217fde62bfSChris Mason 31227fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 31237fde62bfSChris Mason ret = -EFAULT; 31247fde62bfSChris Mason 31257fde62bfSChris Mason kfree(dest_orig); 31267fde62bfSChris Mason out: 31277fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31281406e432SJosef Bacik ret = -EFAULT; 31291406e432SJosef Bacik 31301406e432SJosef Bacik return ret; 31311406e432SJosef Bacik } 31321406e432SJosef Bacik 3133f46b5a66SChristoph Hellwig /* 3134f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3135f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3136f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3137f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3138f46b5a66SChristoph Hellwig */ 3139f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3140f46b5a66SChristoph Hellwig { 3141496ad9aaSAl Viro struct inode *inode = file_inode(file); 3142f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3143f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3144f46b5a66SChristoph Hellwig 3145f46b5a66SChristoph Hellwig trans = file->private_data; 31461ab86aedSSage Weil if (!trans) 31471ab86aedSSage Weil return -EINVAL; 3148b214107eSChristoph Hellwig file->private_data = NULL; 31499ca9ee09SSage Weil 31501ab86aedSSage Weil btrfs_end_transaction(trans, root); 31511ab86aedSSage Weil 3152a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 31539ca9ee09SSage Weil 31542a79f17eSAl Viro mnt_drop_write_file(file); 31551ab86aedSSage Weil return 0; 3156f46b5a66SChristoph Hellwig } 3157f46b5a66SChristoph Hellwig 31589a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31599a8c28beSMiao Xie void __user *argp) 316046204592SSage Weil { 316146204592SSage Weil struct btrfs_trans_handle *trans; 316246204592SSage Weil u64 transid; 3163db5b493aSTsutomu Itoh int ret; 316446204592SSage Weil 3165d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3166ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3167ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 316898d5dc13STsutomu Itoh return PTR_ERR(trans); 3169ff7c1d33SMiao Xie 3170ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3171ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3172ff7c1d33SMiao Xie goto out; 3173ff7c1d33SMiao Xie } 317446204592SSage Weil transid = trans->transid; 3175db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 31768b2b2d3cSTsutomu Itoh if (ret) { 31778b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3178db5b493aSTsutomu Itoh return ret; 31798b2b2d3cSTsutomu Itoh } 3180ff7c1d33SMiao Xie out: 318146204592SSage Weil if (argp) 318246204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 318346204592SSage Weil return -EFAULT; 318446204592SSage Weil return 0; 318546204592SSage Weil } 318646204592SSage Weil 31879a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 31889a8c28beSMiao Xie void __user *argp) 318946204592SSage Weil { 319046204592SSage Weil u64 transid; 319146204592SSage Weil 319246204592SSage Weil if (argp) { 319346204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 319446204592SSage Weil return -EFAULT; 319546204592SSage Weil } else { 319646204592SSage Weil transid = 0; /* current trans */ 319746204592SSage Weil } 319846204592SSage Weil return btrfs_wait_for_commit(root, transid); 319946204592SSage Weil } 320046204592SSage Weil 3201b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3202475f6387SJan Schmidt { 3203496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3204475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3205b8e95489SMiao Xie int ret; 3206475f6387SJan Schmidt 3207475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3208475f6387SJan Schmidt return -EPERM; 3209475f6387SJan Schmidt 3210475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3211475f6387SJan Schmidt if (IS_ERR(sa)) 3212475f6387SJan Schmidt return PTR_ERR(sa); 3213475f6387SJan Schmidt 3214b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3215b8e95489SMiao Xie ret = mnt_want_write_file(file); 3216b8e95489SMiao Xie if (ret) 3217b8e95489SMiao Xie goto out; 3218b8e95489SMiao Xie } 3219b8e95489SMiao Xie 3220aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 322163a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 322263a212abSStefan Behrens 0); 3223475f6387SJan Schmidt 3224475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3225475f6387SJan Schmidt ret = -EFAULT; 3226475f6387SJan Schmidt 3227b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3228b8e95489SMiao Xie mnt_drop_write_file(file); 3229b8e95489SMiao Xie out: 3230475f6387SJan Schmidt kfree(sa); 3231475f6387SJan Schmidt return ret; 3232475f6387SJan Schmidt } 3233475f6387SJan Schmidt 3234475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3235475f6387SJan Schmidt { 3236475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3237475f6387SJan Schmidt return -EPERM; 3238475f6387SJan Schmidt 3239aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3240475f6387SJan Schmidt } 3241475f6387SJan Schmidt 3242475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3243475f6387SJan Schmidt void __user *arg) 3244475f6387SJan Schmidt { 3245475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3246475f6387SJan Schmidt int ret; 3247475f6387SJan Schmidt 3248475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3249475f6387SJan Schmidt return -EPERM; 3250475f6387SJan Schmidt 3251475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3252475f6387SJan Schmidt if (IS_ERR(sa)) 3253475f6387SJan Schmidt return PTR_ERR(sa); 3254475f6387SJan Schmidt 3255475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3256475f6387SJan Schmidt 3257475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3258475f6387SJan Schmidt ret = -EFAULT; 3259475f6387SJan Schmidt 3260475f6387SJan Schmidt kfree(sa); 3261475f6387SJan Schmidt return ret; 3262475f6387SJan Schmidt } 3263475f6387SJan Schmidt 3264c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3265b27f7c0cSDavid Sterba void __user *arg) 3266c11d2c23SStefan Behrens { 3267c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3268c11d2c23SStefan Behrens int ret; 3269c11d2c23SStefan Behrens 3270c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3271c11d2c23SStefan Behrens if (IS_ERR(sa)) 3272c11d2c23SStefan Behrens return PTR_ERR(sa); 3273c11d2c23SStefan Behrens 3274b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3275b27f7c0cSDavid Sterba kfree(sa); 3276b27f7c0cSDavid Sterba return -EPERM; 3277b27f7c0cSDavid Sterba } 3278b27f7c0cSDavid Sterba 3279b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3280c11d2c23SStefan Behrens 3281c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3282c11d2c23SStefan Behrens ret = -EFAULT; 3283c11d2c23SStefan Behrens 3284c11d2c23SStefan Behrens kfree(sa); 3285c11d2c23SStefan Behrens return ret; 3286c11d2c23SStefan Behrens } 3287c11d2c23SStefan Behrens 32883f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 32893f6bcfbdSStefan Behrens { 32903f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32913f6bcfbdSStefan Behrens int ret; 32923f6bcfbdSStefan Behrens 32933f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32943f6bcfbdSStefan Behrens return -EPERM; 32953f6bcfbdSStefan Behrens 32963f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32973f6bcfbdSStefan Behrens if (IS_ERR(p)) 32983f6bcfbdSStefan Behrens return PTR_ERR(p); 32993f6bcfbdSStefan Behrens 33003f6bcfbdSStefan Behrens switch (p->cmd) { 33013f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 33023f6bcfbdSStefan Behrens if (atomic_xchg( 33033f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33043f6bcfbdSStefan Behrens 1)) { 33053f6bcfbdSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 33063f6bcfbdSStefan Behrens ret = -EINPROGRESS; 33073f6bcfbdSStefan Behrens } else { 33083f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 33093f6bcfbdSStefan Behrens atomic_set( 33103f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33113f6bcfbdSStefan Behrens 0); 33123f6bcfbdSStefan Behrens } 33133f6bcfbdSStefan Behrens break; 33143f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 33153f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 33163f6bcfbdSStefan Behrens ret = 0; 33173f6bcfbdSStefan Behrens break; 33183f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 33193f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 33203f6bcfbdSStefan Behrens break; 33213f6bcfbdSStefan Behrens default: 33223f6bcfbdSStefan Behrens ret = -EINVAL; 33233f6bcfbdSStefan Behrens break; 33243f6bcfbdSStefan Behrens } 33253f6bcfbdSStefan Behrens 33263f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 33273f6bcfbdSStefan Behrens ret = -EFAULT; 33283f6bcfbdSStefan Behrens 33293f6bcfbdSStefan Behrens kfree(p); 33303f6bcfbdSStefan Behrens return ret; 33313f6bcfbdSStefan Behrens } 33323f6bcfbdSStefan Behrens 3333d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3334d7728c96SJan Schmidt { 3335d7728c96SJan Schmidt int ret = 0; 3336d7728c96SJan Schmidt int i; 3337740c3d22SChris Mason u64 rel_ptr; 3338d7728c96SJan Schmidt int size; 3339806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3340d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3341d7728c96SJan Schmidt struct btrfs_path *path; 3342d7728c96SJan Schmidt 334382b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3344d7728c96SJan Schmidt return -EPERM; 3345d7728c96SJan Schmidt 3346d7728c96SJan Schmidt path = btrfs_alloc_path(); 3347d7728c96SJan Schmidt if (!path) { 3348d7728c96SJan Schmidt ret = -ENOMEM; 3349d7728c96SJan Schmidt goto out; 3350d7728c96SJan Schmidt } 3351d7728c96SJan Schmidt 3352d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3353d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3354d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3355d7728c96SJan Schmidt ipa = NULL; 3356d7728c96SJan Schmidt goto out; 3357d7728c96SJan Schmidt } 3358d7728c96SJan Schmidt 3359d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3360d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3361d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3362d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3363d7728c96SJan Schmidt ipath = NULL; 3364d7728c96SJan Schmidt goto out; 3365d7728c96SJan Schmidt } 3366d7728c96SJan Schmidt 3367d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3368d7728c96SJan Schmidt if (ret < 0) 3369d7728c96SJan Schmidt goto out; 3370d7728c96SJan Schmidt 3371d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3372745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3373745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3374740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3375d7728c96SJan Schmidt } 3376d7728c96SJan Schmidt 3377745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3378745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3379d7728c96SJan Schmidt if (ret) { 3380d7728c96SJan Schmidt ret = -EFAULT; 3381d7728c96SJan Schmidt goto out; 3382d7728c96SJan Schmidt } 3383d7728c96SJan Schmidt 3384d7728c96SJan Schmidt out: 3385d7728c96SJan Schmidt btrfs_free_path(path); 3386d7728c96SJan Schmidt free_ipath(ipath); 3387d7728c96SJan Schmidt kfree(ipa); 3388d7728c96SJan Schmidt 3389d7728c96SJan Schmidt return ret; 3390d7728c96SJan Schmidt } 3391d7728c96SJan Schmidt 3392d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3393d7728c96SJan Schmidt { 3394d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3395d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3396d7728c96SJan Schmidt 3397d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3398d7728c96SJan Schmidt inodes->bytes_left -= c; 3399d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3400d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3401d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3402d7728c96SJan Schmidt inodes->elem_cnt += 3; 3403d7728c96SJan Schmidt } else { 3404d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3405d7728c96SJan Schmidt inodes->bytes_left = 0; 3406d7728c96SJan Schmidt inodes->elem_missed += 3; 3407d7728c96SJan Schmidt } 3408d7728c96SJan Schmidt 3409d7728c96SJan Schmidt return 0; 3410d7728c96SJan Schmidt } 3411d7728c96SJan Schmidt 3412d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3413d7728c96SJan Schmidt void __user *arg) 3414d7728c96SJan Schmidt { 3415d7728c96SJan Schmidt int ret = 0; 3416d7728c96SJan Schmidt int size; 3417d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3418d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3419d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3420d7728c96SJan Schmidt 3421d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3422d7728c96SJan Schmidt return -EPERM; 3423d7728c96SJan Schmidt 3424d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3425d7728c96SJan Schmidt if (IS_ERR(loi)) { 3426d7728c96SJan Schmidt ret = PTR_ERR(loi); 3427d7728c96SJan Schmidt loi = NULL; 3428d7728c96SJan Schmidt goto out; 3429d7728c96SJan Schmidt } 3430d7728c96SJan Schmidt 3431d7728c96SJan Schmidt path = btrfs_alloc_path(); 3432d7728c96SJan Schmidt if (!path) { 3433d7728c96SJan Schmidt ret = -ENOMEM; 3434d7728c96SJan Schmidt goto out; 3435d7728c96SJan Schmidt } 3436d7728c96SJan Schmidt 3437425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3438d7728c96SJan Schmidt inodes = init_data_container(size); 3439d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3440d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3441d7728c96SJan Schmidt inodes = NULL; 3442d7728c96SJan Schmidt goto out; 3443d7728c96SJan Schmidt } 3444d7728c96SJan Schmidt 3445df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3446df031f07SLiu Bo build_ino_list, inodes); 3447df031f07SLiu Bo if (ret == -EINVAL) 3448d7728c96SJan Schmidt ret = -ENOENT; 3449d7728c96SJan Schmidt if (ret < 0) 3450d7728c96SJan Schmidt goto out; 3451d7728c96SJan Schmidt 3452745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3453745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3454d7728c96SJan Schmidt if (ret) 3455d7728c96SJan Schmidt ret = -EFAULT; 3456d7728c96SJan Schmidt 3457d7728c96SJan Schmidt out: 3458d7728c96SJan Schmidt btrfs_free_path(path); 3459425d17a2SLiu Bo vfree(inodes); 3460d7728c96SJan Schmidt kfree(loi); 3461d7728c96SJan Schmidt 3462d7728c96SJan Schmidt return ret; 3463d7728c96SJan Schmidt } 3464d7728c96SJan Schmidt 346519a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3466c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3467c9e9f97bSIlya Dryomov { 3468c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3469c9e9f97bSIlya Dryomov 3470c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3471c9e9f97bSIlya Dryomov 3472837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3473837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3474837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3475837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3476a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3477a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3478837d5b6eSIlya Dryomov 3479c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3480c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3481c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 348219a39dceSIlya Dryomov 348319a39dceSIlya Dryomov if (lock) { 348419a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 348519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348619a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 348719a39dceSIlya Dryomov } else { 348819a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348919a39dceSIlya Dryomov } 3490c9e9f97bSIlya Dryomov } 3491c9e9f97bSIlya Dryomov 34929ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3493c9e9f97bSIlya Dryomov { 3494496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3495c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3496c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3497c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3498ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3499c9e9f97bSIlya Dryomov int ret; 3500c9e9f97bSIlya Dryomov 3501c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3502c9e9f97bSIlya Dryomov return -EPERM; 3503c9e9f97bSIlya Dryomov 3504e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35059ba1f6e4SLiu Bo if (ret) 35069ba1f6e4SLiu Bo return ret; 35079ba1f6e4SLiu Bo 3508ed0fb78fSIlya Dryomov again: 3509ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3510c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3511c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3512ed0fb78fSIlya Dryomov need_unlock = true; 3513ed0fb78fSIlya Dryomov goto locked; 3514ed0fb78fSIlya Dryomov } 3515ed0fb78fSIlya Dryomov 3516ed0fb78fSIlya Dryomov /* 3517ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3518ed0fb78fSIlya Dryomov * (1) some other op is running 3519ed0fb78fSIlya Dryomov * (2) balance is running 3520ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3521ed0fb78fSIlya Dryomov */ 3522ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3523ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3524ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3525ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3526ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3527ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3528ed0fb78fSIlya Dryomov goto again; 3529ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3530ed0fb78fSIlya Dryomov 3531ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3532ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3533ed0fb78fSIlya Dryomov /* this is (3) */ 3534ed0fb78fSIlya Dryomov need_unlock = false; 3535ed0fb78fSIlya Dryomov goto locked; 3536ed0fb78fSIlya Dryomov } 3537ed0fb78fSIlya Dryomov 3538ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3539ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3540ed0fb78fSIlya Dryomov goto again; 3541ed0fb78fSIlya Dryomov } else { 3542ed0fb78fSIlya Dryomov /* this is (2) */ 3543ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3544ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3545ed0fb78fSIlya Dryomov goto out; 3546ed0fb78fSIlya Dryomov } 3547ed0fb78fSIlya Dryomov } else { 3548ed0fb78fSIlya Dryomov /* this is (1) */ 3549ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3550ed0fb78fSIlya Dryomov pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 3551ed0fb78fSIlya Dryomov ret = -EINVAL; 3552ed0fb78fSIlya Dryomov goto out; 3553ed0fb78fSIlya Dryomov } 3554ed0fb78fSIlya Dryomov 3555ed0fb78fSIlya Dryomov locked: 3556ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3557c9e9f97bSIlya Dryomov 3558c9e9f97bSIlya Dryomov if (arg) { 3559c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3560c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3561c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3562ed0fb78fSIlya Dryomov goto out_unlock; 3563c9e9f97bSIlya Dryomov } 3564de322263SIlya Dryomov 3565de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3566de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3567de322263SIlya Dryomov ret = -ENOTCONN; 3568de322263SIlya Dryomov goto out_bargs; 3569de322263SIlya Dryomov } 3570de322263SIlya Dryomov 3571de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3572de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3573de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3574de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3575de322263SIlya Dryomov 3576de322263SIlya Dryomov goto do_balance; 3577de322263SIlya Dryomov } 3578c9e9f97bSIlya Dryomov } else { 3579c9e9f97bSIlya Dryomov bargs = NULL; 3580c9e9f97bSIlya Dryomov } 3581c9e9f97bSIlya Dryomov 3582ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3583837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3584837d5b6eSIlya Dryomov goto out_bargs; 3585837d5b6eSIlya Dryomov } 3586837d5b6eSIlya Dryomov 3587c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3588c9e9f97bSIlya Dryomov if (!bctl) { 3589c9e9f97bSIlya Dryomov ret = -ENOMEM; 3590c9e9f97bSIlya Dryomov goto out_bargs; 3591c9e9f97bSIlya Dryomov } 3592c9e9f97bSIlya Dryomov 3593c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3594c9e9f97bSIlya Dryomov if (arg) { 3595c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3596c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3597c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3598c9e9f97bSIlya Dryomov 3599c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3600f43ffb60SIlya Dryomov } else { 3601f43ffb60SIlya Dryomov /* balance everything - no filters */ 3602f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3603c9e9f97bSIlya Dryomov } 3604c9e9f97bSIlya Dryomov 3605de322263SIlya Dryomov do_balance: 3606c9e9f97bSIlya Dryomov /* 3607ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3608ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3609ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3610ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3611ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3612c9e9f97bSIlya Dryomov */ 3613ed0fb78fSIlya Dryomov need_unlock = false; 3614ed0fb78fSIlya Dryomov 3615ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3616ed0fb78fSIlya Dryomov 3617c9e9f97bSIlya Dryomov if (arg) { 3618c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3619c9e9f97bSIlya Dryomov ret = -EFAULT; 3620c9e9f97bSIlya Dryomov } 3621c9e9f97bSIlya Dryomov 3622c9e9f97bSIlya Dryomov out_bargs: 3623c9e9f97bSIlya Dryomov kfree(bargs); 3624ed0fb78fSIlya Dryomov out_unlock: 3625c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3626c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3627ed0fb78fSIlya Dryomov if (need_unlock) 3628ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3629ed0fb78fSIlya Dryomov out: 3630e54bfa31SLiu Bo mnt_drop_write_file(file); 3631c9e9f97bSIlya Dryomov return ret; 3632c9e9f97bSIlya Dryomov } 3633c9e9f97bSIlya Dryomov 3634837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3635837d5b6eSIlya Dryomov { 3636837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3637837d5b6eSIlya Dryomov return -EPERM; 3638837d5b6eSIlya Dryomov 3639837d5b6eSIlya Dryomov switch (cmd) { 3640837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3641837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3642a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3643a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3644837d5b6eSIlya Dryomov } 3645837d5b6eSIlya Dryomov 3646837d5b6eSIlya Dryomov return -EINVAL; 3647837d5b6eSIlya Dryomov } 3648837d5b6eSIlya Dryomov 364919a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 365019a39dceSIlya Dryomov void __user *arg) 365119a39dceSIlya Dryomov { 365219a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 365319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 365419a39dceSIlya Dryomov int ret = 0; 365519a39dceSIlya Dryomov 365619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 365719a39dceSIlya Dryomov return -EPERM; 365819a39dceSIlya Dryomov 365919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 366019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 366119a39dceSIlya Dryomov ret = -ENOTCONN; 366219a39dceSIlya Dryomov goto out; 366319a39dceSIlya Dryomov } 366419a39dceSIlya Dryomov 366519a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 366619a39dceSIlya Dryomov if (!bargs) { 366719a39dceSIlya Dryomov ret = -ENOMEM; 366819a39dceSIlya Dryomov goto out; 366919a39dceSIlya Dryomov } 367019a39dceSIlya Dryomov 367119a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 367219a39dceSIlya Dryomov 367319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 367419a39dceSIlya Dryomov ret = -EFAULT; 367519a39dceSIlya Dryomov 367619a39dceSIlya Dryomov kfree(bargs); 367719a39dceSIlya Dryomov out: 367819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 367919a39dceSIlya Dryomov return ret; 368019a39dceSIlya Dryomov } 368119a39dceSIlya Dryomov 3682905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36835d13a37bSArne Jansen { 3684496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 36855d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36865d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 36875d13a37bSArne Jansen int ret; 36885d13a37bSArne Jansen int err; 36895d13a37bSArne Jansen 36905d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36915d13a37bSArne Jansen return -EPERM; 36925d13a37bSArne Jansen 3693905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3694905b0ddaSMiao Xie if (ret) 3695905b0ddaSMiao Xie return ret; 36965d13a37bSArne Jansen 36975d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3698905b0ddaSMiao Xie if (IS_ERR(sa)) { 3699905b0ddaSMiao Xie ret = PTR_ERR(sa); 3700905b0ddaSMiao Xie goto drop_write; 3701905b0ddaSMiao Xie } 37025d13a37bSArne Jansen 37037708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 370492f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 37055d13a37bSArne Jansen if (IS_ERR(trans)) { 37065d13a37bSArne Jansen ret = PTR_ERR(trans); 37075d13a37bSArne Jansen goto out; 37085d13a37bSArne Jansen } 37095d13a37bSArne Jansen 37105d13a37bSArne Jansen switch (sa->cmd) { 37115d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 37125d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 37135d13a37bSArne Jansen break; 37145d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 37155d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 37165d13a37bSArne Jansen break; 37175d13a37bSArne Jansen default: 37185d13a37bSArne Jansen ret = -EINVAL; 37195d13a37bSArne Jansen break; 37205d13a37bSArne Jansen } 37215d13a37bSArne Jansen 37225d13a37bSArne Jansen if (copy_to_user(arg, sa, sizeof(*sa))) 37235d13a37bSArne Jansen ret = -EFAULT; 37245d13a37bSArne Jansen 372592f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 37265d13a37bSArne Jansen if (err && !ret) 37275d13a37bSArne Jansen ret = err; 37285d13a37bSArne Jansen out: 37295d13a37bSArne Jansen kfree(sa); 37307708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 3731905b0ddaSMiao Xie drop_write: 3732905b0ddaSMiao Xie mnt_drop_write_file(file); 37335d13a37bSArne Jansen return ret; 37345d13a37bSArne Jansen } 37355d13a37bSArne Jansen 3736905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37375d13a37bSArne Jansen { 3738496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 37395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37415d13a37bSArne Jansen int ret; 37425d13a37bSArne Jansen int err; 37435d13a37bSArne Jansen 37445d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37455d13a37bSArne Jansen return -EPERM; 37465d13a37bSArne Jansen 3747905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3748905b0ddaSMiao Xie if (ret) 3749905b0ddaSMiao Xie return ret; 37505d13a37bSArne Jansen 37515d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3752905b0ddaSMiao Xie if (IS_ERR(sa)) { 3753905b0ddaSMiao Xie ret = PTR_ERR(sa); 3754905b0ddaSMiao Xie goto drop_write; 3755905b0ddaSMiao Xie } 37565d13a37bSArne Jansen 37575d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37585d13a37bSArne Jansen if (IS_ERR(trans)) { 37595d13a37bSArne Jansen ret = PTR_ERR(trans); 37605d13a37bSArne Jansen goto out; 37615d13a37bSArne Jansen } 37625d13a37bSArne Jansen 37635d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 37645d13a37bSArne Jansen if (sa->assign) { 37655d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 37665d13a37bSArne Jansen sa->src, sa->dst); 37675d13a37bSArne Jansen } else { 37685d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 37695d13a37bSArne Jansen sa->src, sa->dst); 37705d13a37bSArne Jansen } 37715d13a37bSArne Jansen 37725d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 37735d13a37bSArne Jansen if (err && !ret) 37745d13a37bSArne Jansen ret = err; 37755d13a37bSArne Jansen 37765d13a37bSArne Jansen out: 37775d13a37bSArne Jansen kfree(sa); 3778905b0ddaSMiao Xie drop_write: 3779905b0ddaSMiao Xie mnt_drop_write_file(file); 37805d13a37bSArne Jansen return ret; 37815d13a37bSArne Jansen } 37825d13a37bSArne Jansen 3783905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37845d13a37bSArne Jansen { 3785496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 37865d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37875d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37885d13a37bSArne Jansen int ret; 37895d13a37bSArne Jansen int err; 37905d13a37bSArne Jansen 37915d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37925d13a37bSArne Jansen return -EPERM; 37935d13a37bSArne Jansen 3794905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3795905b0ddaSMiao Xie if (ret) 3796905b0ddaSMiao Xie return ret; 37975d13a37bSArne Jansen 37985d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3799905b0ddaSMiao Xie if (IS_ERR(sa)) { 3800905b0ddaSMiao Xie ret = PTR_ERR(sa); 3801905b0ddaSMiao Xie goto drop_write; 3802905b0ddaSMiao Xie } 38035d13a37bSArne Jansen 3804d86e56cfSMiao Xie if (!sa->qgroupid) { 3805d86e56cfSMiao Xie ret = -EINVAL; 3806d86e56cfSMiao Xie goto out; 3807d86e56cfSMiao Xie } 3808d86e56cfSMiao Xie 38095d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38105d13a37bSArne Jansen if (IS_ERR(trans)) { 38115d13a37bSArne Jansen ret = PTR_ERR(trans); 38125d13a37bSArne Jansen goto out; 38135d13a37bSArne Jansen } 38145d13a37bSArne Jansen 38155d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38165d13a37bSArne Jansen if (sa->create) { 38175d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 38185d13a37bSArne Jansen NULL); 38195d13a37bSArne Jansen } else { 38205d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 38215d13a37bSArne Jansen } 38225d13a37bSArne Jansen 38235d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38245d13a37bSArne Jansen if (err && !ret) 38255d13a37bSArne Jansen ret = err; 38265d13a37bSArne Jansen 38275d13a37bSArne Jansen out: 38285d13a37bSArne Jansen kfree(sa); 3829905b0ddaSMiao Xie drop_write: 3830905b0ddaSMiao Xie mnt_drop_write_file(file); 38315d13a37bSArne Jansen return ret; 38325d13a37bSArne Jansen } 38335d13a37bSArne Jansen 3834905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38355d13a37bSArne Jansen { 3836496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 38375d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38385d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38395d13a37bSArne Jansen int ret; 38405d13a37bSArne Jansen int err; 38415d13a37bSArne Jansen u64 qgroupid; 38425d13a37bSArne Jansen 38435d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38445d13a37bSArne Jansen return -EPERM; 38455d13a37bSArne Jansen 3846905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3847905b0ddaSMiao Xie if (ret) 3848905b0ddaSMiao Xie return ret; 38495d13a37bSArne Jansen 38505d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3851905b0ddaSMiao Xie if (IS_ERR(sa)) { 3852905b0ddaSMiao Xie ret = PTR_ERR(sa); 3853905b0ddaSMiao Xie goto drop_write; 3854905b0ddaSMiao Xie } 38555d13a37bSArne Jansen 38565d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38575d13a37bSArne Jansen if (IS_ERR(trans)) { 38585d13a37bSArne Jansen ret = PTR_ERR(trans); 38595d13a37bSArne Jansen goto out; 38605d13a37bSArne Jansen } 38615d13a37bSArne Jansen 38625d13a37bSArne Jansen qgroupid = sa->qgroupid; 38635d13a37bSArne Jansen if (!qgroupid) { 38645d13a37bSArne Jansen /* take the current subvol as qgroup */ 38655d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38665d13a37bSArne Jansen } 38675d13a37bSArne Jansen 38685d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38695d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 38705d13a37bSArne Jansen 38715d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38725d13a37bSArne Jansen if (err && !ret) 38735d13a37bSArne Jansen ret = err; 38745d13a37bSArne Jansen 38755d13a37bSArne Jansen out: 38765d13a37bSArne Jansen kfree(sa); 3877905b0ddaSMiao Xie drop_write: 3878905b0ddaSMiao Xie mnt_drop_write_file(file); 38795d13a37bSArne Jansen return ret; 38805d13a37bSArne Jansen } 38815d13a37bSArne Jansen 38822f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38832f232036SJan Schmidt { 38842f232036SJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 38852f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38862f232036SJan Schmidt int ret; 38872f232036SJan Schmidt 38882f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38892f232036SJan Schmidt return -EPERM; 38902f232036SJan Schmidt 38912f232036SJan Schmidt ret = mnt_want_write_file(file); 38922f232036SJan Schmidt if (ret) 38932f232036SJan Schmidt return ret; 38942f232036SJan Schmidt 38952f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38962f232036SJan Schmidt if (IS_ERR(qsa)) { 38972f232036SJan Schmidt ret = PTR_ERR(qsa); 38982f232036SJan Schmidt goto drop_write; 38992f232036SJan Schmidt } 39002f232036SJan Schmidt 39012f232036SJan Schmidt if (qsa->flags) { 39022f232036SJan Schmidt ret = -EINVAL; 39032f232036SJan Schmidt goto out; 39042f232036SJan Schmidt } 39052f232036SJan Schmidt 39062f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 39072f232036SJan Schmidt 39082f232036SJan Schmidt out: 39092f232036SJan Schmidt kfree(qsa); 39102f232036SJan Schmidt drop_write: 39112f232036SJan Schmidt mnt_drop_write_file(file); 39122f232036SJan Schmidt return ret; 39132f232036SJan Schmidt } 39142f232036SJan Schmidt 39152f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 39162f232036SJan Schmidt { 39172f232036SJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 39182f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 39192f232036SJan Schmidt int ret = 0; 39202f232036SJan Schmidt 39212f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 39222f232036SJan Schmidt return -EPERM; 39232f232036SJan Schmidt 39242f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 39252f232036SJan Schmidt if (!qsa) 39262f232036SJan Schmidt return -ENOMEM; 39272f232036SJan Schmidt 39282f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 39292f232036SJan Schmidt qsa->flags = 1; 39302f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 39312f232036SJan Schmidt } 39322f232036SJan Schmidt 39332f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 39342f232036SJan Schmidt ret = -EFAULT; 39352f232036SJan Schmidt 39362f232036SJan Schmidt kfree(qsa); 39372f232036SJan Schmidt return ret; 39382f232036SJan Schmidt } 39392f232036SJan Schmidt 39408ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 39418ea05e3aSAlexander Block void __user *arg) 39428ea05e3aSAlexander Block { 39438ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 3944496ad9aaSAl Viro struct inode *inode = file_inode(file); 39458ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39468ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39478ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 39488ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 39498ea05e3aSAlexander Block int ret = 0; 39508ea05e3aSAlexander Block 39518ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39528ea05e3aSAlexander Block if (ret < 0) 39538ea05e3aSAlexander Block return ret; 39548ea05e3aSAlexander Block 39558ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 39568ea05e3aSAlexander Block 39578ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 39588ea05e3aSAlexander Block ret = -EINVAL; 39598ea05e3aSAlexander Block goto out; 39608ea05e3aSAlexander Block } 39618ea05e3aSAlexander Block 39628ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39638ea05e3aSAlexander Block ret = -EROFS; 39648ea05e3aSAlexander Block goto out; 39658ea05e3aSAlexander Block } 39668ea05e3aSAlexander Block 39678ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 39688ea05e3aSAlexander Block ret = -EACCES; 39698ea05e3aSAlexander Block goto out; 39708ea05e3aSAlexander Block } 39718ea05e3aSAlexander Block 39728ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 39738ea05e3aSAlexander Block if (IS_ERR(sa)) { 39748ea05e3aSAlexander Block ret = PTR_ERR(sa); 39758ea05e3aSAlexander Block sa = NULL; 39768ea05e3aSAlexander Block goto out; 39778ea05e3aSAlexander Block } 39788ea05e3aSAlexander Block 39798ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 39808ea05e3aSAlexander Block if (IS_ERR(trans)) { 39818ea05e3aSAlexander Block ret = PTR_ERR(trans); 39828ea05e3aSAlexander Block trans = NULL; 39838ea05e3aSAlexander Block goto out; 39848ea05e3aSAlexander Block } 39858ea05e3aSAlexander Block 39868ea05e3aSAlexander Block sa->rtransid = trans->transid; 39878ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39888ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39898ea05e3aSAlexander Block 39908ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39918ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39928ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39938ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 39948ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 39958ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 39968ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 39978ea05e3aSAlexander Block 39988ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 39998ea05e3aSAlexander Block &root->root_key, &root->root_item); 40008ea05e3aSAlexander Block if (ret < 0) { 40018ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 40028ea05e3aSAlexander Block trans = NULL; 40038ea05e3aSAlexander Block goto out; 40048ea05e3aSAlexander Block } else { 40058ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 40068ea05e3aSAlexander Block if (ret < 0) 40078ea05e3aSAlexander Block goto out; 40088ea05e3aSAlexander Block } 40098ea05e3aSAlexander Block 40108ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40118ea05e3aSAlexander Block if (ret) 40128ea05e3aSAlexander Block ret = -EFAULT; 40138ea05e3aSAlexander Block 40148ea05e3aSAlexander Block out: 40158ea05e3aSAlexander Block kfree(sa); 40168ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 40178ea05e3aSAlexander Block mnt_drop_write_file(file); 40188ea05e3aSAlexander Block return ret; 40198ea05e3aSAlexander Block } 40208ea05e3aSAlexander Block 4021867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4022867ab667Sjeff.liu { 4023867ab667Sjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 4024867ab667Sjeff.liu const char *label = root->fs_info->super_copy->label; 4025867ab667Sjeff.liu size_t len = strnlen(label, BTRFS_LABEL_SIZE); 4026867ab667Sjeff.liu int ret; 4027867ab667Sjeff.liu 4028867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4029867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4030867ab667Sjeff.liu --len); 4031867ab667Sjeff.liu } 4032867ab667Sjeff.liu 4033867ab667Sjeff.liu mutex_lock(&root->fs_info->volume_mutex); 4034867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4035867ab667Sjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 4036867ab667Sjeff.liu 4037867ab667Sjeff.liu return ret ? -EFAULT : 0; 4038867ab667Sjeff.liu } 4039867ab667Sjeff.liu 4040a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4041a8bfd4abSjeff.liu { 4042a8bfd4abSjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 4043a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4044a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4045a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4046a8bfd4abSjeff.liu int ret; 4047a8bfd4abSjeff.liu 4048a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4049a8bfd4abSjeff.liu return -EPERM; 4050a8bfd4abSjeff.liu 4051a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4052a8bfd4abSjeff.liu return -EFAULT; 4053a8bfd4abSjeff.liu 4054a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4055a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4056a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4057a8bfd4abSjeff.liu return -EINVAL; 4058a8bfd4abSjeff.liu } 4059a8bfd4abSjeff.liu 4060a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4061a8bfd4abSjeff.liu if (ret) 4062a8bfd4abSjeff.liu return ret; 4063a8bfd4abSjeff.liu 4064a8bfd4abSjeff.liu mutex_lock(&root->fs_info->volume_mutex); 4065a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4066a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4067a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4068a8bfd4abSjeff.liu goto out_unlock; 4069a8bfd4abSjeff.liu } 4070a8bfd4abSjeff.liu 4071a8bfd4abSjeff.liu strcpy(super_block->label, label); 4072a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4073a8bfd4abSjeff.liu 4074a8bfd4abSjeff.liu out_unlock: 4075a8bfd4abSjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 4076a8bfd4abSjeff.liu mnt_drop_write_file(file); 4077a8bfd4abSjeff.liu return ret; 4078a8bfd4abSjeff.liu } 4079a8bfd4abSjeff.liu 4080f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4081f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4082f46b5a66SChristoph Hellwig { 4083496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40844bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4085f46b5a66SChristoph Hellwig 4086f46b5a66SChristoph Hellwig switch (cmd) { 40876cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 40886cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 40896cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 40906cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 40916cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 40926cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4093f7039b1dSLi Dongyang case FITRIM: 4094f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4095f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4096fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4097fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4098fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 40993de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4100fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 41016f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 41026f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 410376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 410476dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 41050caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 41060caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 41070caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 41080caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 41096ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 41106ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4111f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 41121e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 41131e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 41141e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4115f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4116198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4117f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 41184bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4119f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4120da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4121475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4122475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4123475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4124475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4125f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 41269ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4127f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4128c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4129c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 41307a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4131f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4132f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4133f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4134f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4135ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4136ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4137ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4138ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4139d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4140d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4141d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4142d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 41431406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 41441406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 4145f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 4146f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 4147f46b5a66SChristoph Hellwig return 0; 414846204592SSage Weil case BTRFS_IOC_START_SYNC: 41499a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 415046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 41519a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4152475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4153b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4154475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4155475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4156475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4157475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4158c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 41599ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4160837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4161837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 416219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 416319a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 41648ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 41658ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 416631db9f7cSAlexander Block case BTRFS_IOC_SEND: 416731db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4168c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4169b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 41705d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4171905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 41725d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4173905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 41745d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4175905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 41765d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4177905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 41782f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 41792f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 41802f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 41812f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 41823f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 41833f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4184867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4185867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4186a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4187a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4188f46b5a66SChristoph Hellwig } 4189f46b5a66SChristoph Hellwig 4190f46b5a66SChristoph Hellwig return -ENOTTY; 4191f46b5a66SChristoph Hellwig } 4192