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 5586a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 5596a03843dSMiao Xie if (ret) 5606a03843dSMiao Xie return ret; 5616a03843dSMiao Xie 5626a03843dSMiao Xie btrfs_wait_ordered_extents(root, 0); 5636a03843dSMiao Xie 564a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 565a22285a6SYan, Zheng if (!pending_snapshot) 566a22285a6SYan, Zheng return -ENOMEM; 567a22285a6SYan, Zheng 56866d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 56966d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 570d5c12070SMiao Xie /* 571d5c12070SMiao Xie * 1 - parent dir inode 572d5c12070SMiao Xie * 2 - dir entries 573d5c12070SMiao Xie * 1 - root item 574d5c12070SMiao Xie * 2 - root ref/backref 575d5c12070SMiao Xie * 1 - root of snapshot 576d5c12070SMiao Xie */ 577d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 578d5c12070SMiao Xie &pending_snapshot->block_rsv, 7, 579d5c12070SMiao Xie &pending_snapshot->qgroup_reserved); 580d5c12070SMiao Xie if (ret) 581d5c12070SMiao Xie goto out; 582d5c12070SMiao Xie 583a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 584a22285a6SYan, Zheng pending_snapshot->root = root; 585b83cc969SLi Zefan pending_snapshot->readonly = readonly; 586e9662f70SMiao Xie pending_snapshot->dir = dir; 5878696c533SMiao Xie pending_snapshot->inherit = inherit; 588a22285a6SYan, Zheng 589d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 590a22285a6SYan, Zheng if (IS_ERR(trans)) { 591a22285a6SYan, Zheng ret = PTR_ERR(trans); 592a22285a6SYan, Zheng goto fail; 593a22285a6SYan, Zheng } 594a22285a6SYan, Zheng 5958351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 596a22285a6SYan, Zheng list_add(&pending_snapshot->list, 597a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5988351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 59972fd032eSSage Weil if (async_transid) { 60072fd032eSSage Weil *async_transid = trans->transid; 60172fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 60272fd032eSSage Weil root->fs_info->extent_root, 1); 60300d71c9cSMiao Xie if (ret) 60400d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 60572fd032eSSage Weil } else { 60672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 60772fd032eSSage Weil root->fs_info->extent_root); 60872fd032eSSage Weil } 609aec8030aSMiao Xie if (ret) 610c37b2b62SJosef Bacik goto fail; 611a22285a6SYan, Zheng 612a22285a6SYan, Zheng ret = pending_snapshot->error; 613f46b5a66SChristoph Hellwig if (ret) 6142e4bfab9SYan, Zheng goto fail; 615f46b5a66SChristoph Hellwig 61666b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 61766b4ffd1SJosef Bacik if (ret) 61866b4ffd1SJosef Bacik goto fail; 619f46b5a66SChristoph Hellwig 6202fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6212e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6222e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6232e4bfab9SYan, Zheng goto fail; 6242e4bfab9SYan, Zheng } 6252e4bfab9SYan, Zheng BUG_ON(!inode); 6262e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6272e4bfab9SYan, Zheng ret = 0; 6282e4bfab9SYan, Zheng fail: 629d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 630d5c12070SMiao Xie &pending_snapshot->block_rsv, 631d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 632d5c12070SMiao Xie out: 633a22285a6SYan, Zheng kfree(pending_snapshot); 634f46b5a66SChristoph Hellwig return ret; 635f46b5a66SChristoph Hellwig } 636f46b5a66SChristoph Hellwig 6374260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6384260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6394260f7c7SSage Weil * minimal. 6404260f7c7SSage Weil */ 6414260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6424260f7c7SSage Weil { 6432f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6444260f7c7SSage Weil 6454260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6464260f7c7SSage Weil return 0; 6472f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6484260f7c7SSage Weil return 0; 6492f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6504260f7c7SSage Weil return 0; 6514260f7c7SSage Weil return !capable(CAP_FOWNER); 6524260f7c7SSage Weil } 6534260f7c7SSage Weil 6544260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6554260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6564260f7c7SSage Weil * whether the type of victim is right. 6574260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6584260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6594260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6604260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6614260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6624260f7c7SSage Weil * a. be owner of dir, or 6634260f7c7SSage Weil * b. be owner of victim, or 6644260f7c7SSage Weil * c. have CAP_FOWNER capability 6654260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6664260f7c7SSage Weil * links pointing to it. 6674260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6684260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6694260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6704260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6714260f7c7SSage Weil * nfs_async_unlink(). 6724260f7c7SSage Weil */ 6734260f7c7SSage Weil 6744260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6754260f7c7SSage Weil { 6764260f7c7SSage Weil int error; 6774260f7c7SSage Weil 6784260f7c7SSage Weil if (!victim->d_inode) 6794260f7c7SSage Weil return -ENOENT; 6804260f7c7SSage Weil 6814260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6824fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 6834260f7c7SSage Weil 6844260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6854260f7c7SSage Weil if (error) 6864260f7c7SSage Weil return error; 6874260f7c7SSage Weil if (IS_APPEND(dir)) 6884260f7c7SSage Weil return -EPERM; 6894260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6904260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6914260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6924260f7c7SSage Weil return -EPERM; 6934260f7c7SSage Weil if (isdir) { 6944260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6954260f7c7SSage Weil return -ENOTDIR; 6964260f7c7SSage Weil if (IS_ROOT(victim)) 6974260f7c7SSage Weil return -EBUSY; 6984260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6994260f7c7SSage Weil return -EISDIR; 7004260f7c7SSage Weil if (IS_DEADDIR(dir)) 7014260f7c7SSage Weil return -ENOENT; 7024260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7034260f7c7SSage Weil return -EBUSY; 7044260f7c7SSage Weil return 0; 7054260f7c7SSage Weil } 7064260f7c7SSage Weil 707cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 708cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 709cb8e7090SChristoph Hellwig { 710cb8e7090SChristoph Hellwig if (child->d_inode) 711cb8e7090SChristoph Hellwig return -EEXIST; 712cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 713cb8e7090SChristoph Hellwig return -ENOENT; 714cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 715cb8e7090SChristoph Hellwig } 716cb8e7090SChristoph Hellwig 717cb8e7090SChristoph Hellwig /* 718cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 719cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 720cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 721cb8e7090SChristoph Hellwig */ 72276dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 72376dda93cSYan, Zheng char *name, int namelen, 72472fd032eSSage Weil struct btrfs_root *snap_src, 7256f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7268696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 727cb8e7090SChristoph Hellwig { 72876dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 729cb8e7090SChristoph Hellwig struct dentry *dentry; 730cb8e7090SChristoph Hellwig int error; 731cb8e7090SChristoph Hellwig 7325c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7335c50c9b8SDavid Sterba if (error == -EINTR) 7345c50c9b8SDavid Sterba return error; 735cb8e7090SChristoph Hellwig 736cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 737cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 738cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 739cb8e7090SChristoph Hellwig goto out_unlock; 740cb8e7090SChristoph Hellwig 741cb8e7090SChristoph Hellwig error = -EEXIST; 742cb8e7090SChristoph Hellwig if (dentry->d_inode) 743cb8e7090SChristoph Hellwig goto out_dput; 744cb8e7090SChristoph Hellwig 74576dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 746cb8e7090SChristoph Hellwig if (error) 747a874a63eSLiu Bo goto out_dput; 748cb8e7090SChristoph Hellwig 7499c52057cSChris Mason /* 7509c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7519c52057cSChris Mason * check for them now when we can safely fail 7529c52057cSChris Mason */ 7539c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7549c52057cSChris Mason dir->i_ino, name, 7559c52057cSChris Mason namelen); 7569c52057cSChris Mason if (error) 7579c52057cSChris Mason goto out_dput; 7589c52057cSChris Mason 75976dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 76076dda93cSYan, Zheng 76176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 76276dda93cSYan, Zheng goto out_up_read; 76376dda93cSYan, Zheng 7643de4586cSChris Mason if (snap_src) { 765e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7666f72c7e2SArne Jansen async_transid, readonly, inherit); 7673de4586cSChris Mason } else { 768d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 769d5c12070SMiao Xie async_transid, inherit); 7703de4586cSChris Mason } 77176dda93cSYan, Zheng if (!error) 77276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 77376dda93cSYan, Zheng out_up_read: 77476dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 775cb8e7090SChristoph Hellwig out_dput: 776cb8e7090SChristoph Hellwig dput(dentry); 777cb8e7090SChristoph Hellwig out_unlock: 77876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 779cb8e7090SChristoph Hellwig return error; 780cb8e7090SChristoph Hellwig } 781cb8e7090SChristoph Hellwig 7824cb5300bSChris Mason /* 7834cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7844cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7854cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7864cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7874cb5300bSChris Mason * part of the file 7884cb5300bSChris Mason */ 7894cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7904cb5300bSChris Mason { 7914cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7924cb5300bSChris Mason struct extent_map *em = NULL; 7934cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7944cb5300bSChris Mason u64 end; 7954cb5300bSChris Mason 7964cb5300bSChris Mason read_lock(&em_tree->lock); 7974cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7984cb5300bSChris Mason read_unlock(&em_tree->lock); 7994cb5300bSChris Mason 8004cb5300bSChris Mason if (em) { 8014cb5300bSChris Mason end = extent_map_end(em); 8024cb5300bSChris Mason free_extent_map(em); 8034cb5300bSChris Mason if (end - offset > thresh) 8044cb5300bSChris Mason return 0; 8054cb5300bSChris Mason } 8064cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8074cb5300bSChris Mason thresh /= 2; 8084cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8094cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8104cb5300bSChris Mason if (end >= thresh) 8114cb5300bSChris Mason return 0; 8124cb5300bSChris Mason return 1; 8134cb5300bSChris Mason } 8144cb5300bSChris Mason 8154cb5300bSChris Mason /* 8164cb5300bSChris Mason * helper function to walk through a file and find extents 8174cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8184cb5300bSChris Mason * 8194cb5300bSChris Mason * This is used by the defragging code to find new and small 8204cb5300bSChris Mason * extents 8214cb5300bSChris Mason */ 8224cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8234cb5300bSChris Mason struct inode *inode, u64 newer_than, 8244cb5300bSChris Mason u64 *off, int thresh) 8254cb5300bSChris Mason { 8264cb5300bSChris Mason struct btrfs_path *path; 8274cb5300bSChris Mason struct btrfs_key min_key; 8284cb5300bSChris Mason struct btrfs_key max_key; 8294cb5300bSChris Mason struct extent_buffer *leaf; 8304cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8314cb5300bSChris Mason int type; 8324cb5300bSChris Mason int ret; 833a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8344cb5300bSChris Mason 8354cb5300bSChris Mason path = btrfs_alloc_path(); 8364cb5300bSChris Mason if (!path) 8374cb5300bSChris Mason return -ENOMEM; 8384cb5300bSChris Mason 839a4689d2bSDavid Sterba min_key.objectid = ino; 8404cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8414cb5300bSChris Mason min_key.offset = *off; 8424cb5300bSChris Mason 843a4689d2bSDavid Sterba max_key.objectid = ino; 8444cb5300bSChris Mason max_key.type = (u8)-1; 8454cb5300bSChris Mason max_key.offset = (u64)-1; 8464cb5300bSChris Mason 8474cb5300bSChris Mason path->keep_locks = 1; 8484cb5300bSChris Mason 8494cb5300bSChris Mason while(1) { 8504cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 851de78b51aSEric Sandeen path, newer_than); 8524cb5300bSChris Mason if (ret != 0) 8534cb5300bSChris Mason goto none; 854a4689d2bSDavid Sterba if (min_key.objectid != ino) 8554cb5300bSChris Mason goto none; 8564cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8574cb5300bSChris Mason goto none; 8584cb5300bSChris Mason 8594cb5300bSChris Mason leaf = path->nodes[0]; 8604cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8614cb5300bSChris Mason struct btrfs_file_extent_item); 8624cb5300bSChris Mason 8634cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8644cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8654cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8664cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8674cb5300bSChris Mason *off = min_key.offset; 8684cb5300bSChris Mason btrfs_free_path(path); 8694cb5300bSChris Mason return 0; 8704cb5300bSChris Mason } 8714cb5300bSChris Mason 8724cb5300bSChris Mason if (min_key.offset == (u64)-1) 8734cb5300bSChris Mason goto none; 8744cb5300bSChris Mason 8754cb5300bSChris Mason min_key.offset++; 8764cb5300bSChris Mason btrfs_release_path(path); 8774cb5300bSChris Mason } 8784cb5300bSChris Mason none: 8794cb5300bSChris Mason btrfs_free_path(path); 8804cb5300bSChris Mason return -ENOENT; 8814cb5300bSChris Mason } 8824cb5300bSChris Mason 8836c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 88417ce6ef8SLiu Bo { 88517ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 886940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8876c282eb4SLi Zefan struct extent_map *em; 8886c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 889940100a4SChris Mason 890940100a4SChris Mason /* 891940100a4SChris Mason * hopefully we have this extent in the tree already, try without 892940100a4SChris Mason * the full extent lock 893940100a4SChris Mason */ 894940100a4SChris Mason read_lock(&em_tree->lock); 895940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 896940100a4SChris Mason read_unlock(&em_tree->lock); 897940100a4SChris Mason 898940100a4SChris Mason if (!em) { 899940100a4SChris Mason /* get the big lock and read metadata off disk */ 900d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 901940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 902d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 903940100a4SChris Mason 9046cf8bfbfSDan Carpenter if (IS_ERR(em)) 9056c282eb4SLi Zefan return NULL; 906940100a4SChris Mason } 907940100a4SChris Mason 9086c282eb4SLi Zefan return em; 9096c282eb4SLi Zefan } 9106c282eb4SLi Zefan 9116c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9126c282eb4SLi Zefan { 9136c282eb4SLi Zefan struct extent_map *next; 9146c282eb4SLi Zefan bool ret = true; 9156c282eb4SLi Zefan 9166c282eb4SLi Zefan /* this is the last extent */ 9176c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9186c282eb4SLi Zefan return false; 9196c282eb4SLi Zefan 9206c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9216c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9226c282eb4SLi Zefan ret = false; 9236c282eb4SLi Zefan 9246c282eb4SLi Zefan free_extent_map(next); 9256c282eb4SLi Zefan return ret; 9266c282eb4SLi Zefan } 9276c282eb4SLi Zefan 9286c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 929a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 930a43a2111SAndrew Mahone int compress) 9316c282eb4SLi Zefan { 9326c282eb4SLi Zefan struct extent_map *em; 9336c282eb4SLi Zefan int ret = 1; 9346c282eb4SLi Zefan bool next_mergeable = true; 9356c282eb4SLi Zefan 9366c282eb4SLi Zefan /* 9376c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9386c282eb4SLi Zefan * defragging it 9396c282eb4SLi Zefan */ 9406c282eb4SLi Zefan if (start < *defrag_end) 9416c282eb4SLi Zefan return 1; 9426c282eb4SLi Zefan 9436c282eb4SLi Zefan *skip = 0; 9446c282eb4SLi Zefan 9456c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9466c282eb4SLi Zefan if (!em) 9476c282eb4SLi Zefan return 0; 9486c282eb4SLi Zefan 949940100a4SChris Mason /* this will cover holes, and inline extents */ 95017ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 951940100a4SChris Mason ret = 0; 95217ce6ef8SLiu Bo goto out; 95317ce6ef8SLiu Bo } 95417ce6ef8SLiu Bo 9556c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 956940100a4SChris Mason 957940100a4SChris Mason /* 9586c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9596c282eb4SLi Zefan * real extent, don't bother defragging it 960940100a4SChris Mason */ 961a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9626c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 963940100a4SChris Mason ret = 0; 96417ce6ef8SLiu Bo out: 965940100a4SChris Mason /* 966940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 967940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 968940100a4SChris Mason * so that the next tiny extent will force a defrag. 969940100a4SChris Mason * 970940100a4SChris Mason * The end result of this is that tiny extents before a single big 971940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 972940100a4SChris Mason */ 973940100a4SChris Mason if (ret) { 974940100a4SChris Mason *defrag_end = extent_map_end(em); 975940100a4SChris Mason } else { 976940100a4SChris Mason *last_len = 0; 977940100a4SChris Mason *skip = extent_map_end(em); 978940100a4SChris Mason *defrag_end = 0; 979940100a4SChris Mason } 980940100a4SChris Mason 981940100a4SChris Mason free_extent_map(em); 982940100a4SChris Mason return ret; 983940100a4SChris Mason } 984940100a4SChris Mason 9854cb5300bSChris Mason /* 9864cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9874cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9884cb5300bSChris Mason * to COW and defrag. 9894cb5300bSChris Mason * 9904cb5300bSChris Mason * It also makes sure the delalloc code has enough 9914cb5300bSChris Mason * dirty data to avoid making new small extents as part 9924cb5300bSChris Mason * of the defrag 9934cb5300bSChris Mason * 9944cb5300bSChris Mason * It's a good idea to start RA on this range 9954cb5300bSChris Mason * before calling this. 9964cb5300bSChris Mason */ 9974cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9984cb5300bSChris Mason struct page **pages, 9994cb5300bSChris Mason unsigned long start_index, 10004cb5300bSChris Mason int num_pages) 1001f46b5a66SChristoph Hellwig { 10024cb5300bSChris Mason unsigned long file_end; 10034cb5300bSChris Mason u64 isize = i_size_read(inode); 1004f46b5a66SChristoph Hellwig u64 page_start; 1005f46b5a66SChristoph Hellwig u64 page_end; 10061f12bd06SLiu Bo u64 page_cnt; 10074cb5300bSChris Mason int ret; 10084cb5300bSChris Mason int i; 10094cb5300bSChris Mason int i_done; 10104cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10114cb5300bSChris Mason struct extent_state *cached_state = NULL; 1012600a45e1SMiao Xie struct extent_io_tree *tree; 10133b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10144cb5300bSChris Mason 10154cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10161f12bd06SLiu Bo if (!isize || start_index > file_end) 10171f12bd06SLiu Bo return 0; 10181f12bd06SLiu Bo 10191f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10204cb5300bSChris Mason 10214cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10221f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10234cb5300bSChris Mason if (ret) 10244cb5300bSChris Mason return ret; 10254cb5300bSChris Mason i_done = 0; 1026600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10274cb5300bSChris Mason 10284cb5300bSChris Mason /* step one, lock all the pages */ 10291f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10304cb5300bSChris Mason struct page *page; 1031600a45e1SMiao Xie again: 1032a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10333b16a4e3SJosef Bacik start_index + i, mask); 10344cb5300bSChris Mason if (!page) 10354cb5300bSChris Mason break; 10364cb5300bSChris Mason 1037600a45e1SMiao Xie page_start = page_offset(page); 1038600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1039600a45e1SMiao Xie while (1) { 1040d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1041600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1042600a45e1SMiao Xie page_start); 1043d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1044600a45e1SMiao Xie if (!ordered) 1045600a45e1SMiao Xie break; 1046600a45e1SMiao Xie 1047600a45e1SMiao Xie unlock_page(page); 1048600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1049600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1050600a45e1SMiao Xie lock_page(page); 10511f12bd06SLiu Bo /* 10521f12bd06SLiu Bo * we unlocked the page above, so we need check if 10531f12bd06SLiu Bo * it was released or not. 10541f12bd06SLiu Bo */ 10551f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10561f12bd06SLiu Bo unlock_page(page); 10571f12bd06SLiu Bo page_cache_release(page); 10581f12bd06SLiu Bo goto again; 10591f12bd06SLiu Bo } 1060600a45e1SMiao Xie } 1061600a45e1SMiao Xie 10624cb5300bSChris Mason if (!PageUptodate(page)) { 10634cb5300bSChris Mason btrfs_readpage(NULL, page); 10644cb5300bSChris Mason lock_page(page); 10654cb5300bSChris Mason if (!PageUptodate(page)) { 10664cb5300bSChris Mason unlock_page(page); 10674cb5300bSChris Mason page_cache_release(page); 10684cb5300bSChris Mason ret = -EIO; 10694cb5300bSChris Mason break; 10704cb5300bSChris Mason } 10714cb5300bSChris Mason } 1072600a45e1SMiao Xie 1073600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1074600a45e1SMiao Xie unlock_page(page); 1075600a45e1SMiao Xie page_cache_release(page); 1076600a45e1SMiao Xie goto again; 1077600a45e1SMiao Xie } 1078600a45e1SMiao Xie 10794cb5300bSChris Mason pages[i] = page; 10804cb5300bSChris Mason i_done++; 10814cb5300bSChris Mason } 10824cb5300bSChris Mason if (!i_done || ret) 10834cb5300bSChris Mason goto out; 10844cb5300bSChris Mason 10854cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10864cb5300bSChris Mason goto out; 10874cb5300bSChris Mason 10884cb5300bSChris Mason /* 10894cb5300bSChris Mason * so now we have a nice long stream of locked 10904cb5300bSChris Mason * and up to date pages, lets wait on them 10914cb5300bSChris Mason */ 10924cb5300bSChris Mason for (i = 0; i < i_done; i++) 10934cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10944cb5300bSChris Mason 10954cb5300bSChris Mason page_start = page_offset(pages[0]); 10964cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10974cb5300bSChris Mason 10984cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1099d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11004cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11014cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11029e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11039e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11044cb5300bSChris Mason 11051f12bd06SLiu Bo if (i_done != page_cnt) { 11069e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11079e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11089e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11094cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11101f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11114cb5300bSChris Mason } 11124cb5300bSChris Mason 11134cb5300bSChris Mason 11149e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11159e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11164cb5300bSChris Mason 11174cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11184cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11194cb5300bSChris Mason GFP_NOFS); 11204cb5300bSChris Mason 11214cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11224cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11234cb5300bSChris Mason ClearPageChecked(pages[i]); 11244cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11254cb5300bSChris Mason set_page_dirty(pages[i]); 11264cb5300bSChris Mason unlock_page(pages[i]); 11274cb5300bSChris Mason page_cache_release(pages[i]); 11284cb5300bSChris Mason } 11294cb5300bSChris Mason return i_done; 11304cb5300bSChris Mason out: 11314cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11324cb5300bSChris Mason unlock_page(pages[i]); 11334cb5300bSChris Mason page_cache_release(pages[i]); 11344cb5300bSChris Mason } 11351f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11364cb5300bSChris Mason return ret; 11374cb5300bSChris Mason 11384cb5300bSChris Mason } 11394cb5300bSChris Mason 11404cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11414cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11424cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11434cb5300bSChris Mason { 11444cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11454cb5300bSChris Mason struct file_ra_state *ra = NULL; 11464cb5300bSChris Mason unsigned long last_index; 1147151a31b2SLi Zefan u64 isize = i_size_read(inode); 1148940100a4SChris Mason u64 last_len = 0; 1149940100a4SChris Mason u64 skip = 0; 1150940100a4SChris Mason u64 defrag_end = 0; 11514cb5300bSChris Mason u64 newer_off = range->start; 1152f46b5a66SChristoph Hellwig unsigned long i; 1153008873eaSLi Zefan unsigned long ra_index = 0; 1154f46b5a66SChristoph Hellwig int ret; 11554cb5300bSChris Mason int defrag_count = 0; 11561a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11574cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1158008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1159008873eaSLi Zefan int cluster = max_cluster; 11604cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11614cb5300bSChris Mason struct page **pages = NULL; 11624cb5300bSChris Mason 11630abd5b17SLiu Bo if (isize == 0) 11640abd5b17SLiu Bo return 0; 11650abd5b17SLiu Bo 11660abd5b17SLiu Bo if (range->start >= isize) 11670abd5b17SLiu Bo return -EINVAL; 11681a419d85SLi Zefan 11691a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11701a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11711a419d85SLi Zefan return -EINVAL; 11721a419d85SLi Zefan if (range->compress_type) 11731a419d85SLi Zefan compress_type = range->compress_type; 11741a419d85SLi Zefan } 1175f46b5a66SChristoph Hellwig 11760abd5b17SLiu Bo if (extent_thresh == 0) 11770abd5b17SLiu Bo extent_thresh = 256 * 1024; 1178f46b5a66SChristoph Hellwig 11794cb5300bSChris Mason /* 11804cb5300bSChris Mason * if we were not given a file, allocate a readahead 11814cb5300bSChris Mason * context 11824cb5300bSChris Mason */ 11834cb5300bSChris Mason if (!file) { 11844cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11854cb5300bSChris Mason if (!ra) 11864cb5300bSChris Mason return -ENOMEM; 11874cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11884cb5300bSChris Mason } else { 11894cb5300bSChris Mason ra = &file->f_ra; 11904cb5300bSChris Mason } 11914cb5300bSChris Mason 1192008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11934cb5300bSChris Mason GFP_NOFS); 11944cb5300bSChris Mason if (!pages) { 11954cb5300bSChris Mason ret = -ENOMEM; 11964cb5300bSChris Mason goto out_ra; 11974cb5300bSChris Mason } 11984cb5300bSChris Mason 11994cb5300bSChris Mason /* find the last page to defrag */ 12001e701a32SChris Mason if (range->start + range->len > range->start) { 1201151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12021e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12031e701a32SChris Mason } else { 1204151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12051e701a32SChris Mason } 12061e701a32SChris Mason 12074cb5300bSChris Mason if (newer_than) { 12084cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12094cb5300bSChris Mason &newer_off, 64 * 1024); 12104cb5300bSChris Mason if (!ret) { 12114cb5300bSChris Mason range->start = newer_off; 12124cb5300bSChris Mason /* 12134cb5300bSChris Mason * we always align our defrag to help keep 12144cb5300bSChris Mason * the extents in the file evenly spaced 12154cb5300bSChris Mason */ 12164cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12174cb5300bSChris Mason } else 12184cb5300bSChris Mason goto out_ra; 12194cb5300bSChris Mason } else { 12201e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12214cb5300bSChris Mason } 12224cb5300bSChris Mason if (!max_to_defrag) 12237ec31b54SLiu Bo max_to_defrag = last_index + 1; 12244cb5300bSChris Mason 12252a0f7f57SLi Zefan /* 12262a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12272a0f7f57SLi Zefan * written sequentially. 12282a0f7f57SLi Zefan */ 12292a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12302a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12312a0f7f57SLi Zefan 1232f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1233f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1234f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12354cb5300bSChris Mason /* 12364cb5300bSChris Mason * make sure we stop running if someone unmounts 12374cb5300bSChris Mason * the FS 12384cb5300bSChris Mason */ 12394cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12404cb5300bSChris Mason break; 12414cb5300bSChris Mason 1242210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1243210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1244210549ebSDavid Sterba ret = -EAGAIN; 1245210549ebSDavid Sterba break; 1246210549ebSDavid Sterba } 1247210549ebSDavid Sterba 124866c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12496c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1250a43a2111SAndrew Mahone &defrag_end, range->flags & 1251a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1252940100a4SChris Mason unsigned long next; 1253940100a4SChris Mason /* 1254940100a4SChris Mason * the should_defrag function tells us how much to skip 1255940100a4SChris Mason * bump our counter by the suggested amount 1256940100a4SChris Mason */ 1257940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1258940100a4SChris Mason i = max(i + 1, next); 1259940100a4SChris Mason continue; 1260940100a4SChris Mason } 1261008873eaSLi Zefan 1262008873eaSLi Zefan if (!newer_than) { 1263008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1264008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1265008873eaSLi Zefan cluster = min(cluster, max_cluster); 1266008873eaSLi Zefan } else { 1267008873eaSLi Zefan cluster = max_cluster; 1268008873eaSLi Zefan } 1269008873eaSLi Zefan 12701e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 12711a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1272940100a4SChris Mason 1273008873eaSLi Zefan if (i + cluster > ra_index) { 1274008873eaSLi Zefan ra_index = max(i, ra_index); 1275008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1276008873eaSLi Zefan cluster); 1277008873eaSLi Zefan ra_index += max_cluster; 1278008873eaSLi Zefan } 12794cb5300bSChris Mason 1280ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1281008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1282ecb8bea8SLiu Bo if (ret < 0) { 1283ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12844cb5300bSChris Mason goto out_ra; 1285ecb8bea8SLiu Bo } 12864cb5300bSChris Mason 12874cb5300bSChris Mason defrag_count += ret; 1288d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1289ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12904cb5300bSChris Mason 12914cb5300bSChris Mason if (newer_than) { 12924cb5300bSChris Mason if (newer_off == (u64)-1) 12934cb5300bSChris Mason break; 12944cb5300bSChris Mason 1295e1f041e1SLiu Bo if (ret > 0) 1296e1f041e1SLiu Bo i += ret; 1297e1f041e1SLiu Bo 12984cb5300bSChris Mason newer_off = max(newer_off + 1, 12994cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13004cb5300bSChris Mason 13014cb5300bSChris Mason ret = find_new_extents(root, inode, 13024cb5300bSChris Mason newer_than, &newer_off, 13034cb5300bSChris Mason 64 * 1024); 13044cb5300bSChris Mason if (!ret) { 13054cb5300bSChris Mason range->start = newer_off; 13064cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13074cb5300bSChris Mason } else { 13084cb5300bSChris Mason break; 1309940100a4SChris Mason } 13104cb5300bSChris Mason } else { 1311008873eaSLi Zefan if (ret > 0) { 1312cbcc8326SLi Zefan i += ret; 1313008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1314008873eaSLi Zefan } else { 1315940100a4SChris Mason i++; 1316008873eaSLi Zefan last_len = 0; 1317008873eaSLi Zefan } 1318f46b5a66SChristoph Hellwig } 13194cb5300bSChris Mason } 1320f46b5a66SChristoph Hellwig 13211e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13221e701a32SChris Mason filemap_flush(inode->i_mapping); 13231e701a32SChris Mason 13241e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13251e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13261e701a32SChris Mason * we have to make sure the IO is actually started and that 13271e701a32SChris Mason * ordered extents get created before we return 13281e701a32SChris Mason */ 13291e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13301e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13311e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13321e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13331e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13341e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13351e701a32SChris Mason } 13361e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13371e701a32SChris Mason 13381e701a32SChris Mason mutex_lock(&inode->i_mutex); 1339261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 13401e701a32SChris Mason mutex_unlock(&inode->i_mutex); 13411e701a32SChris Mason } 13421e701a32SChris Mason 13431a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13442b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13451a419d85SLi Zefan } 13461a419d85SLi Zefan 134760ccf82fSDiego Calleja ret = defrag_count; 1348940100a4SChris Mason 13494cb5300bSChris Mason out_ra: 13504cb5300bSChris Mason if (!file) 13514cb5300bSChris Mason kfree(ra); 13524cb5300bSChris Mason kfree(pages); 1353940100a4SChris Mason return ret; 1354f46b5a66SChristoph Hellwig } 1355f46b5a66SChristoph Hellwig 1356198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 135776dda93cSYan, Zheng void __user *arg) 1358f46b5a66SChristoph Hellwig { 1359f46b5a66SChristoph Hellwig u64 new_size; 1360f46b5a66SChristoph Hellwig u64 old_size; 1361f46b5a66SChristoph Hellwig u64 devid = 1; 1362496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1363f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1364f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1365f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1366f46b5a66SChristoph Hellwig char *sizestr; 1367f46b5a66SChristoph Hellwig char *devstr = NULL; 1368f46b5a66SChristoph Hellwig int ret = 0; 1369f46b5a66SChristoph Hellwig int mod = 0; 1370f46b5a66SChristoph Hellwig 1371e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1372e441d54dSChris Mason return -EPERM; 1373e441d54dSChris Mason 1374198605a8SMiao Xie ret = mnt_want_write_file(file); 1375198605a8SMiao Xie if (ret) 1376198605a8SMiao Xie return ret; 1377198605a8SMiao Xie 13785ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13795ac00addSStefan Behrens 1)) { 13805ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 138197547676SMiao Xie mnt_drop_write_file(file); 13822c0c9da0SIlya Dryomov return -EINVAL; 1383c9e9f97bSIlya Dryomov } 1384c9e9f97bSIlya Dryomov 13855ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1386dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1387c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1388c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1389c9e9f97bSIlya Dryomov goto out; 1390c9e9f97bSIlya Dryomov } 13915516e595SMark Fasheh 13925516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1393f46b5a66SChristoph Hellwig 1394f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1395f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1396f46b5a66SChristoph Hellwig if (devstr) { 1397f46b5a66SChristoph Hellwig char *end; 1398f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1399f46b5a66SChristoph Hellwig *devstr = '\0'; 1400f46b5a66SChristoph Hellwig devstr = vol_args->name; 1401f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1402dfd79829SMiao Xie if (!devid) { 1403dfd79829SMiao Xie ret = -EINVAL; 1404dfd79829SMiao Xie goto out_free; 1405dfd79829SMiao Xie } 14065bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 140721380931SJoel Becker (unsigned long long)devid); 1408f46b5a66SChristoph Hellwig } 1409dba60f3fSMiao Xie 1410aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1411f46b5a66SChristoph Hellwig if (!device) { 14125bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 141321380931SJoel Becker (unsigned long long)devid); 1414dfd79829SMiao Xie ret = -ENODEV; 1415c9e9f97bSIlya Dryomov goto out_free; 1416f46b5a66SChristoph Hellwig } 1417dba60f3fSMiao Xie 1418dba60f3fSMiao Xie if (!device->writeable) { 14194e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1420dba60f3fSMiao Xie "readonly device %llu\n", 1421a8c4a33bSChris Mason (unsigned long long)devid); 1422dfd79829SMiao Xie ret = -EPERM; 14234e42ae1bSLiu Bo goto out_free; 14244e42ae1bSLiu Bo } 14254e42ae1bSLiu Bo 1426f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1427f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1428f46b5a66SChristoph Hellwig else { 1429f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1430f46b5a66SChristoph Hellwig mod = -1; 1431f46b5a66SChristoph Hellwig sizestr++; 1432f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1433f46b5a66SChristoph Hellwig mod = 1; 1434f46b5a66SChristoph Hellwig sizestr++; 1435f46b5a66SChristoph Hellwig } 143691748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1437f46b5a66SChristoph Hellwig if (new_size == 0) { 1438f46b5a66SChristoph Hellwig ret = -EINVAL; 1439c9e9f97bSIlya Dryomov goto out_free; 1440f46b5a66SChristoph Hellwig } 1441f46b5a66SChristoph Hellwig } 1442f46b5a66SChristoph Hellwig 144363a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1444dfd79829SMiao Xie ret = -EPERM; 144563a212abSStefan Behrens goto out_free; 144663a212abSStefan Behrens } 144763a212abSStefan Behrens 1448f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1449f46b5a66SChristoph Hellwig 1450f46b5a66SChristoph Hellwig if (mod < 0) { 1451f46b5a66SChristoph Hellwig if (new_size > old_size) { 1452f46b5a66SChristoph Hellwig ret = -EINVAL; 1453c9e9f97bSIlya Dryomov goto out_free; 1454f46b5a66SChristoph Hellwig } 1455f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1456f46b5a66SChristoph Hellwig } else if (mod > 0) { 1457f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1458f46b5a66SChristoph Hellwig } 1459f46b5a66SChristoph Hellwig 1460f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1461f46b5a66SChristoph Hellwig ret = -EINVAL; 1462c9e9f97bSIlya Dryomov goto out_free; 1463f46b5a66SChristoph Hellwig } 1464f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1465f46b5a66SChristoph Hellwig ret = -EFBIG; 1466c9e9f97bSIlya Dryomov goto out_free; 1467f46b5a66SChristoph Hellwig } 1468f46b5a66SChristoph Hellwig 1469f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1470f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1471f46b5a66SChristoph Hellwig 1472606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1473606686eeSJosef Bacik rcu_str_deref(device->name), 1474606686eeSJosef Bacik (unsigned long long)new_size); 1475f46b5a66SChristoph Hellwig 1476f46b5a66SChristoph Hellwig if (new_size > old_size) { 1477a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 147898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 147998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1480c9e9f97bSIlya Dryomov goto out_free; 148198d5dc13STsutomu Itoh } 1482f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1483f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1484ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1485f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14860253f40eSjeff.liu } /* equal, nothing need to do */ 1487f46b5a66SChristoph Hellwig 1488c9e9f97bSIlya Dryomov out_free: 1489f46b5a66SChristoph Hellwig kfree(vol_args); 1490c9e9f97bSIlya Dryomov out: 1491c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 14925ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 149318f39c41SIlya Dryomov mnt_drop_write_file(file); 1494f46b5a66SChristoph Hellwig return ret; 1495f46b5a66SChristoph Hellwig } 1496f46b5a66SChristoph Hellwig 149772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 14986f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 14996f72c7e2SArne Jansen u64 *transid, bool readonly, 15008696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1501f46b5a66SChristoph Hellwig { 1502f46b5a66SChristoph Hellwig int namelen; 15033de4586cSChris Mason int ret = 0; 1504f46b5a66SChristoph Hellwig 1505a874a63eSLiu Bo ret = mnt_want_write_file(file); 1506a874a63eSLiu Bo if (ret) 1507a874a63eSLiu Bo goto out; 1508a874a63eSLiu Bo 150972fd032eSSage Weil namelen = strlen(name); 151072fd032eSSage Weil if (strchr(name, '/')) { 1511f46b5a66SChristoph Hellwig ret = -EINVAL; 1512a874a63eSLiu Bo goto out_drop_write; 1513f46b5a66SChristoph Hellwig } 1514f46b5a66SChristoph Hellwig 151516780cabSChris Mason if (name[0] == '.' && 151616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 151716780cabSChris Mason ret = -EEXIST; 1518a874a63eSLiu Bo goto out_drop_write; 151916780cabSChris Mason } 152016780cabSChris Mason 15213de4586cSChris Mason if (subvol) { 152272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15236f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1524cb8e7090SChristoph Hellwig } else { 15252903ff01SAl Viro struct fd src = fdget(fd); 15263de4586cSChris Mason struct inode *src_inode; 15272903ff01SAl Viro if (!src.file) { 15283de4586cSChris Mason ret = -EINVAL; 1529a874a63eSLiu Bo goto out_drop_write; 15303de4586cSChris Mason } 15313de4586cSChris Mason 1532496ad9aaSAl Viro src_inode = file_inode(src.file); 1533496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1534d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1535d397712bSChris Mason "another FS\n"); 15363de4586cSChris Mason ret = -EINVAL; 1537ecd18815SAl Viro } else { 153872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 153972fd032eSSage Weil BTRFS_I(src_inode)->root, 15406f72c7e2SArne Jansen transid, readonly, inherit); 1541ecd18815SAl Viro } 15422903ff01SAl Viro fdput(src); 1543cb8e7090SChristoph Hellwig } 1544a874a63eSLiu Bo out_drop_write: 1545a874a63eSLiu Bo mnt_drop_write_file(file); 1546f46b5a66SChristoph Hellwig out: 154772fd032eSSage Weil return ret; 154872fd032eSSage Weil } 154972fd032eSSage Weil 155072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1551fa0d2b9bSLi Zefan void __user *arg, int subvol) 155272fd032eSSage Weil { 1553fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 155472fd032eSSage Weil int ret; 155572fd032eSSage Weil 1556fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1557fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1558fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1559fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1560fa0d2b9bSLi Zefan 1561fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1562b83cc969SLi Zefan vol_args->fd, subvol, 15636f72c7e2SArne Jansen NULL, false, NULL); 1564fa0d2b9bSLi Zefan 1565fa0d2b9bSLi Zefan kfree(vol_args); 1566fa0d2b9bSLi Zefan return ret; 1567fa0d2b9bSLi Zefan } 1568fa0d2b9bSLi Zefan 1569fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1570fa0d2b9bSLi Zefan void __user *arg, int subvol) 1571fa0d2b9bSLi Zefan { 1572fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1573fa0d2b9bSLi Zefan int ret; 1574fdfb1e4fSLi Zefan u64 transid = 0; 1575fdfb1e4fSLi Zefan u64 *ptr = NULL; 1576b83cc969SLi Zefan bool readonly = false; 15776f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 157872fd032eSSage Weil 1579fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1580fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1581fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1582fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1583fdfb1e4fSLi Zefan 1584b83cc969SLi Zefan if (vol_args->flags & 15856f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15866f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1587b83cc969SLi Zefan ret = -EOPNOTSUPP; 1588fdfb1e4fSLi Zefan goto out; 1589fdfb1e4fSLi Zefan } 1590fdfb1e4fSLi Zefan 1591fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1592fdfb1e4fSLi Zefan ptr = &transid; 1593b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1594b83cc969SLi Zefan readonly = true; 15956f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 15966f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 15976f72c7e2SArne Jansen ret = -EINVAL; 15986f72c7e2SArne Jansen goto out; 15996f72c7e2SArne Jansen } 16006f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16016f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16026f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16036f72c7e2SArne Jansen goto out; 16046f72c7e2SArne Jansen } 16056f72c7e2SArne Jansen } 160675eaa0e2SSage Weil 1607fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16086f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16098696c533SMiao Xie readonly, inherit); 161075eaa0e2SSage Weil 1611fdfb1e4fSLi Zefan if (ret == 0 && ptr && 161275eaa0e2SSage Weil copy_to_user(arg + 1613fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1614fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 161575eaa0e2SSage Weil ret = -EFAULT; 1616fdfb1e4fSLi Zefan out: 1617f46b5a66SChristoph Hellwig kfree(vol_args); 16186f72c7e2SArne Jansen kfree(inherit); 1619f46b5a66SChristoph Hellwig return ret; 1620f46b5a66SChristoph Hellwig } 1621f46b5a66SChristoph Hellwig 16220caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16230caa102dSLi Zefan void __user *arg) 16240caa102dSLi Zefan { 1625496ad9aaSAl Viro struct inode *inode = file_inode(file); 16260caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16270caa102dSLi Zefan int ret = 0; 16280caa102dSLi Zefan u64 flags = 0; 16290caa102dSLi Zefan 163033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16310caa102dSLi Zefan return -EINVAL; 16320caa102dSLi Zefan 16330caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16340caa102dSLi Zefan if (btrfs_root_readonly(root)) 16350caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16360caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16370caa102dSLi Zefan 16380caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16390caa102dSLi Zefan ret = -EFAULT; 16400caa102dSLi Zefan 16410caa102dSLi Zefan return ret; 16420caa102dSLi Zefan } 16430caa102dSLi Zefan 16440caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16450caa102dSLi Zefan void __user *arg) 16460caa102dSLi Zefan { 1647496ad9aaSAl Viro struct inode *inode = file_inode(file); 16480caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16490caa102dSLi Zefan struct btrfs_trans_handle *trans; 16500caa102dSLi Zefan u64 root_flags; 16510caa102dSLi Zefan u64 flags; 16520caa102dSLi Zefan int ret = 0; 16530caa102dSLi Zefan 1654b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1655b9ca0664SLiu Bo if (ret) 1656b9ca0664SLiu Bo goto out; 16570caa102dSLi Zefan 1658b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1659b9ca0664SLiu Bo ret = -EINVAL; 1660b9ca0664SLiu Bo goto out_drop_write; 1661b9ca0664SLiu Bo } 16620caa102dSLi Zefan 1663b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1664b9ca0664SLiu Bo ret = -EFAULT; 1665b9ca0664SLiu Bo goto out_drop_write; 1666b9ca0664SLiu Bo } 16670caa102dSLi Zefan 1668b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1669b9ca0664SLiu Bo ret = -EINVAL; 1670b9ca0664SLiu Bo goto out_drop_write; 1671b9ca0664SLiu Bo } 16720caa102dSLi Zefan 1673b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1674b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1675b9ca0664SLiu Bo goto out_drop_write; 1676b9ca0664SLiu Bo } 16770caa102dSLi Zefan 1678b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1679b9ca0664SLiu Bo ret = -EACCES; 1680b9ca0664SLiu Bo goto out_drop_write; 1681b9ca0664SLiu Bo } 1682b4dc2b8cSLi Zefan 16830caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16840caa102dSLi Zefan 16850caa102dSLi Zefan /* nothing to do */ 16860caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1687b9ca0664SLiu Bo goto out_drop_sem; 16880caa102dSLi Zefan 16890caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 16900caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 16910caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16920caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 16930caa102dSLi Zefan else 16940caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16950caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 16960caa102dSLi Zefan 16970caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 16980caa102dSLi Zefan if (IS_ERR(trans)) { 16990caa102dSLi Zefan ret = PTR_ERR(trans); 17000caa102dSLi Zefan goto out_reset; 17010caa102dSLi Zefan } 17020caa102dSLi Zefan 1703b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17040caa102dSLi Zefan &root->root_key, &root->root_item); 17050caa102dSLi Zefan 17060caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17070caa102dSLi Zefan out_reset: 17080caa102dSLi Zefan if (ret) 17090caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1710b9ca0664SLiu Bo out_drop_sem: 17110caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1712b9ca0664SLiu Bo out_drop_write: 1713b9ca0664SLiu Bo mnt_drop_write_file(file); 1714b9ca0664SLiu Bo out: 17150caa102dSLi Zefan return ret; 17160caa102dSLi Zefan } 17170caa102dSLi Zefan 171876dda93cSYan, Zheng /* 171976dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 172076dda93cSYan, Zheng */ 172176dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 172276dda93cSYan, Zheng { 172376dda93cSYan, Zheng struct btrfs_path *path; 172476dda93cSYan, Zheng struct btrfs_key key; 172576dda93cSYan, Zheng int ret; 172676dda93cSYan, Zheng 172776dda93cSYan, Zheng path = btrfs_alloc_path(); 172876dda93cSYan, Zheng if (!path) 172976dda93cSYan, Zheng return -ENOMEM; 173076dda93cSYan, Zheng 173176dda93cSYan, Zheng key.objectid = root->root_key.objectid; 173276dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 173376dda93cSYan, Zheng key.offset = (u64)-1; 173476dda93cSYan, Zheng 173576dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 173676dda93cSYan, Zheng &key, path, 0, 0); 173776dda93cSYan, Zheng if (ret < 0) 173876dda93cSYan, Zheng goto out; 173976dda93cSYan, Zheng BUG_ON(ret == 0); 174076dda93cSYan, Zheng 174176dda93cSYan, Zheng ret = 0; 174276dda93cSYan, Zheng if (path->slots[0] > 0) { 174376dda93cSYan, Zheng path->slots[0]--; 174476dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 174576dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 174676dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 174776dda93cSYan, Zheng ret = -ENOTEMPTY; 174876dda93cSYan, Zheng } 174976dda93cSYan, Zheng out: 175076dda93cSYan, Zheng btrfs_free_path(path); 175176dda93cSYan, Zheng return ret; 175276dda93cSYan, Zheng } 175376dda93cSYan, Zheng 1754ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1755ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1756ac8e9819SChris Mason { 1757abc6e134SChris Mason struct btrfs_key test; 1758abc6e134SChris Mason int ret; 1759abc6e134SChris Mason 1760abc6e134SChris Mason test.objectid = sk->min_objectid; 1761abc6e134SChris Mason test.type = sk->min_type; 1762abc6e134SChris Mason test.offset = sk->min_offset; 1763abc6e134SChris Mason 1764abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1765abc6e134SChris Mason if (ret < 0) 1766ac8e9819SChris Mason return 0; 1767abc6e134SChris Mason 1768abc6e134SChris Mason test.objectid = sk->max_objectid; 1769abc6e134SChris Mason test.type = sk->max_type; 1770abc6e134SChris Mason test.offset = sk->max_offset; 1771abc6e134SChris Mason 1772abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1773abc6e134SChris Mason if (ret > 0) 1774ac8e9819SChris Mason return 0; 1775ac8e9819SChris Mason return 1; 1776ac8e9819SChris Mason } 1777ac8e9819SChris Mason 1778ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1779ac8e9819SChris Mason struct btrfs_path *path, 1780ac8e9819SChris Mason struct btrfs_key *key, 1781ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1782ac8e9819SChris Mason char *buf, 1783ac8e9819SChris Mason unsigned long *sk_offset, 1784ac8e9819SChris Mason int *num_found) 1785ac8e9819SChris Mason { 1786ac8e9819SChris Mason u64 found_transid; 1787ac8e9819SChris Mason struct extent_buffer *leaf; 1788ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1789ac8e9819SChris Mason unsigned long item_off; 1790ac8e9819SChris Mason unsigned long item_len; 1791ac8e9819SChris Mason int nritems; 1792ac8e9819SChris Mason int i; 1793ac8e9819SChris Mason int slot; 1794ac8e9819SChris Mason int ret = 0; 1795ac8e9819SChris Mason 1796ac8e9819SChris Mason leaf = path->nodes[0]; 1797ac8e9819SChris Mason slot = path->slots[0]; 1798ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1799ac8e9819SChris Mason 1800ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1801ac8e9819SChris Mason i = nritems; 1802ac8e9819SChris Mason goto advance_key; 1803ac8e9819SChris Mason } 1804ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1805ac8e9819SChris Mason 1806ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1807ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1808ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1809ac8e9819SChris Mason 181003b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 181103b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 181203b71c6cSGabriel de Perthuis continue; 181303b71c6cSGabriel de Perthuis 181403b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1815ac8e9819SChris Mason item_len = 0; 1816ac8e9819SChris Mason 1817ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1818ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1819ac8e9819SChris Mason ret = 1; 1820ac8e9819SChris Mason goto overflow; 1821ac8e9819SChris Mason } 1822ac8e9819SChris Mason 1823ac8e9819SChris Mason sh.objectid = key->objectid; 1824ac8e9819SChris Mason sh.offset = key->offset; 1825ac8e9819SChris Mason sh.type = key->type; 1826ac8e9819SChris Mason sh.len = item_len; 1827ac8e9819SChris Mason sh.transid = found_transid; 1828ac8e9819SChris Mason 1829ac8e9819SChris Mason /* copy search result header */ 1830ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1831ac8e9819SChris Mason *sk_offset += sizeof(sh); 1832ac8e9819SChris Mason 1833ac8e9819SChris Mason if (item_len) { 1834ac8e9819SChris Mason char *p = buf + *sk_offset; 1835ac8e9819SChris Mason /* copy the item */ 1836ac8e9819SChris Mason read_extent_buffer(leaf, p, 1837ac8e9819SChris Mason item_off, item_len); 1838ac8e9819SChris Mason *sk_offset += item_len; 1839ac8e9819SChris Mason } 1840e2156867SHugo Mills (*num_found)++; 1841ac8e9819SChris Mason 1842ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1843ac8e9819SChris Mason break; 1844ac8e9819SChris Mason } 1845ac8e9819SChris Mason advance_key: 1846ac8e9819SChris Mason ret = 0; 1847abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1848abc6e134SChris Mason key->offset++; 1849abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1850abc6e134SChris Mason key->offset = 0; 1851abc6e134SChris Mason key->type++; 1852abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1853abc6e134SChris Mason key->offset = 0; 1854abc6e134SChris Mason key->type = 0; 1855abc6e134SChris Mason key->objectid++; 1856abc6e134SChris Mason } else 1857abc6e134SChris Mason ret = 1; 1858ac8e9819SChris Mason overflow: 1859ac8e9819SChris Mason return ret; 1860ac8e9819SChris Mason } 1861ac8e9819SChris Mason 1862ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1863ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1864ac8e9819SChris Mason { 1865ac8e9819SChris Mason struct btrfs_root *root; 1866ac8e9819SChris Mason struct btrfs_key key; 1867ac8e9819SChris Mason struct btrfs_key max_key; 1868ac8e9819SChris Mason struct btrfs_path *path; 1869ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1870ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1871ac8e9819SChris Mason int ret; 1872ac8e9819SChris Mason int num_found = 0; 1873ac8e9819SChris Mason unsigned long sk_offset = 0; 1874ac8e9819SChris Mason 1875ac8e9819SChris Mason path = btrfs_alloc_path(); 1876ac8e9819SChris Mason if (!path) 1877ac8e9819SChris Mason return -ENOMEM; 1878ac8e9819SChris Mason 1879ac8e9819SChris Mason if (sk->tree_id == 0) { 1880ac8e9819SChris Mason /* search the root of the inode that was passed */ 1881ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1882ac8e9819SChris Mason } else { 1883ac8e9819SChris Mason key.objectid = sk->tree_id; 1884ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1885ac8e9819SChris Mason key.offset = (u64)-1; 1886ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1887ac8e9819SChris Mason if (IS_ERR(root)) { 1888ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1889ac8e9819SChris Mason sk->tree_id); 1890ac8e9819SChris Mason btrfs_free_path(path); 1891ac8e9819SChris Mason return -ENOENT; 1892ac8e9819SChris Mason } 1893ac8e9819SChris Mason } 1894ac8e9819SChris Mason 1895ac8e9819SChris Mason key.objectid = sk->min_objectid; 1896ac8e9819SChris Mason key.type = sk->min_type; 1897ac8e9819SChris Mason key.offset = sk->min_offset; 1898ac8e9819SChris Mason 1899ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1900ac8e9819SChris Mason max_key.type = sk->max_type; 1901ac8e9819SChris Mason max_key.offset = sk->max_offset; 1902ac8e9819SChris Mason 1903ac8e9819SChris Mason path->keep_locks = 1; 1904ac8e9819SChris Mason 1905ac8e9819SChris Mason while(1) { 1906de78b51aSEric Sandeen ret = btrfs_search_forward(root, &key, &max_key, path, 1907ac8e9819SChris Mason sk->min_transid); 1908ac8e9819SChris Mason if (ret != 0) { 1909ac8e9819SChris Mason if (ret > 0) 1910ac8e9819SChris Mason ret = 0; 1911ac8e9819SChris Mason goto err; 1912ac8e9819SChris Mason } 1913ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1914ac8e9819SChris Mason &sk_offset, &num_found); 1915b3b4aa74SDavid Sterba btrfs_release_path(path); 1916ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1917ac8e9819SChris Mason break; 1918ac8e9819SChris Mason 1919ac8e9819SChris Mason } 1920ac8e9819SChris Mason ret = 0; 1921ac8e9819SChris Mason err: 1922ac8e9819SChris Mason sk->nr_items = num_found; 1923ac8e9819SChris Mason btrfs_free_path(path); 1924ac8e9819SChris Mason return ret; 1925ac8e9819SChris Mason } 1926ac8e9819SChris Mason 1927ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1928ac8e9819SChris Mason void __user *argp) 1929ac8e9819SChris Mason { 1930ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1931ac8e9819SChris Mason struct inode *inode; 1932ac8e9819SChris Mason int ret; 1933ac8e9819SChris Mason 1934ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1935ac8e9819SChris Mason return -EPERM; 1936ac8e9819SChris Mason 19372354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19382354d08fSJulia Lawall if (IS_ERR(args)) 19392354d08fSJulia Lawall return PTR_ERR(args); 1940ac8e9819SChris Mason 1941496ad9aaSAl Viro inode = file_inode(file); 1942ac8e9819SChris Mason ret = search_ioctl(inode, args); 1943ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1944ac8e9819SChris Mason ret = -EFAULT; 1945ac8e9819SChris Mason kfree(args); 1946ac8e9819SChris Mason return ret; 1947ac8e9819SChris Mason } 1948ac8e9819SChris Mason 194998d377a0STARUISI Hiroaki /* 1950ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1951ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 195298d377a0STARUISI Hiroaki */ 195398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 195498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 195598d377a0STARUISI Hiroaki { 195698d377a0STARUISI Hiroaki struct btrfs_root *root; 195798d377a0STARUISI Hiroaki struct btrfs_key key; 1958ac8e9819SChris Mason char *ptr; 195998d377a0STARUISI Hiroaki int ret = -1; 196098d377a0STARUISI Hiroaki int slot; 196198d377a0STARUISI Hiroaki int len; 196298d377a0STARUISI Hiroaki int total_len = 0; 196398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 196498d377a0STARUISI Hiroaki struct extent_buffer *l; 196598d377a0STARUISI Hiroaki struct btrfs_path *path; 196698d377a0STARUISI Hiroaki 196798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 196898d377a0STARUISI Hiroaki name[0]='\0'; 196998d377a0STARUISI Hiroaki return 0; 197098d377a0STARUISI Hiroaki } 197198d377a0STARUISI Hiroaki 197298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 197398d377a0STARUISI Hiroaki if (!path) 197498d377a0STARUISI Hiroaki return -ENOMEM; 197598d377a0STARUISI Hiroaki 1976ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 197798d377a0STARUISI Hiroaki 197898d377a0STARUISI Hiroaki key.objectid = tree_id; 197998d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 198098d377a0STARUISI Hiroaki key.offset = (u64)-1; 198198d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 198298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 198398d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 19848ad6fcabSChris Mason ret = -ENOENT; 19858ad6fcabSChris Mason goto out; 198698d377a0STARUISI Hiroaki } 198798d377a0STARUISI Hiroaki 198898d377a0STARUISI Hiroaki key.objectid = dirid; 198998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 19908ad6fcabSChris Mason key.offset = (u64)-1; 199198d377a0STARUISI Hiroaki 199298d377a0STARUISI Hiroaki while(1) { 199398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 199498d377a0STARUISI Hiroaki if (ret < 0) 199598d377a0STARUISI Hiroaki goto out; 199698d377a0STARUISI Hiroaki 199798d377a0STARUISI Hiroaki l = path->nodes[0]; 199898d377a0STARUISI Hiroaki slot = path->slots[0]; 19998ad6fcabSChris Mason if (ret > 0 && slot > 0) 20008ad6fcabSChris Mason slot--; 200198d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 200298d377a0STARUISI Hiroaki 200398d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 2004ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 2005ac8e9819SChris Mason ret = -ENOENT; 200698d377a0STARUISI Hiroaki goto out; 2007ac8e9819SChris Mason } 200898d377a0STARUISI Hiroaki 200998d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 201098d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 201198d377a0STARUISI Hiroaki ptr -= len + 1; 201298d377a0STARUISI Hiroaki total_len += len + 1; 2013ac8e9819SChris Mason if (ptr < name) 201498d377a0STARUISI Hiroaki goto out; 201598d377a0STARUISI Hiroaki 201698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 201798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 201898d377a0STARUISI Hiroaki 201998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 202098d377a0STARUISI Hiroaki break; 202198d377a0STARUISI Hiroaki 2022b3b4aa74SDavid Sterba btrfs_release_path(path); 202398d377a0STARUISI Hiroaki key.objectid = key.offset; 20248ad6fcabSChris Mason key.offset = (u64)-1; 202598d377a0STARUISI Hiroaki dirid = key.objectid; 202698d377a0STARUISI Hiroaki } 2027ac8e9819SChris Mason if (ptr < name) 202898d377a0STARUISI Hiroaki goto out; 202977906a50SLi Zefan memmove(name, ptr, total_len); 203098d377a0STARUISI Hiroaki name[total_len]='\0'; 203198d377a0STARUISI Hiroaki ret = 0; 203298d377a0STARUISI Hiroaki out: 203398d377a0STARUISI Hiroaki btrfs_free_path(path); 2034ac8e9819SChris Mason return ret; 2035ac8e9819SChris Mason } 2036ac8e9819SChris Mason 2037ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2038ac8e9819SChris Mason void __user *argp) 2039ac8e9819SChris Mason { 2040ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2041ac8e9819SChris Mason struct inode *inode; 2042ac8e9819SChris Mason int ret; 2043ac8e9819SChris Mason 2044ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2045ac8e9819SChris Mason return -EPERM; 2046ac8e9819SChris Mason 20472354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20482354d08fSJulia Lawall if (IS_ERR(args)) 20492354d08fSJulia Lawall return PTR_ERR(args); 2050c2b96929SDan Carpenter 2051496ad9aaSAl Viro inode = file_inode(file); 2052ac8e9819SChris Mason 20531b53ac4dSChris Mason if (args->treeid == 0) 20541b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20551b53ac4dSChris Mason 2056ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2057ac8e9819SChris Mason args->treeid, args->objectid, 2058ac8e9819SChris Mason args->name); 2059ac8e9819SChris Mason 2060ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2061ac8e9819SChris Mason ret = -EFAULT; 2062ac8e9819SChris Mason 2063ac8e9819SChris Mason kfree(args); 206498d377a0STARUISI Hiroaki return ret; 206598d377a0STARUISI Hiroaki } 206698d377a0STARUISI Hiroaki 206776dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 206876dda93cSYan, Zheng void __user *arg) 206976dda93cSYan, Zheng { 207076dda93cSYan, Zheng struct dentry *parent = fdentry(file); 207176dda93cSYan, Zheng struct dentry *dentry; 207276dda93cSYan, Zheng struct inode *dir = parent->d_inode; 207376dda93cSYan, Zheng struct inode *inode; 207476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 207576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 207676dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 207776dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2078c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2079c58aaad2SMiao Xie u64 qgroup_reserved; 208076dda93cSYan, Zheng int namelen; 208176dda93cSYan, Zheng int ret; 208276dda93cSYan, Zheng int err = 0; 208376dda93cSYan, Zheng 208476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 208576dda93cSYan, Zheng if (IS_ERR(vol_args)) 208676dda93cSYan, Zheng return PTR_ERR(vol_args); 208776dda93cSYan, Zheng 208876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 208976dda93cSYan, Zheng namelen = strlen(vol_args->name); 209076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 209176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 209276dda93cSYan, Zheng err = -EINVAL; 209376dda93cSYan, Zheng goto out; 209476dda93cSYan, Zheng } 209576dda93cSYan, Zheng 2096a561be71SAl Viro err = mnt_want_write_file(file); 209776dda93cSYan, Zheng if (err) 209876dda93cSYan, Zheng goto out; 209976dda93cSYan, Zheng 21005c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21015c50c9b8SDavid Sterba if (err == -EINTR) 21025c50c9b8SDavid Sterba goto out; 210376dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 210476dda93cSYan, Zheng if (IS_ERR(dentry)) { 210576dda93cSYan, Zheng err = PTR_ERR(dentry); 210676dda93cSYan, Zheng goto out_unlock_dir; 210776dda93cSYan, Zheng } 210876dda93cSYan, Zheng 210976dda93cSYan, Zheng if (!dentry->d_inode) { 211076dda93cSYan, Zheng err = -ENOENT; 211176dda93cSYan, Zheng goto out_dput; 211276dda93cSYan, Zheng } 211376dda93cSYan, Zheng 211476dda93cSYan, Zheng inode = dentry->d_inode; 21154260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21164260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 21174260f7c7SSage Weil /* 21184260f7c7SSage Weil * Regular user. Only allow this with a special mount 21194260f7c7SSage Weil * option, when the user has write+exec access to the 21204260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21214260f7c7SSage Weil * allowed. 21224260f7c7SSage Weil * 21234260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21244260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21254260f7c7SSage Weil * otherwise be able to delete. 21264260f7c7SSage Weil * 21274260f7c7SSage Weil * Users who want to delete empty subvols should try 21284260f7c7SSage Weil * rmdir(2). 21294260f7c7SSage Weil */ 21304260f7c7SSage Weil err = -EPERM; 21314260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21324260f7c7SSage Weil goto out_dput; 21334260f7c7SSage Weil 21344260f7c7SSage Weil /* 21354260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21364260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21374260f7c7SSage Weil * must be called on the dentry referencing the root 21384260f7c7SSage Weil * of the subvol, not a random directory contained 21394260f7c7SSage Weil * within it. 21404260f7c7SSage Weil */ 21414260f7c7SSage Weil err = -EINVAL; 21424260f7c7SSage Weil if (root == dest) 21434260f7c7SSage Weil goto out_dput; 21444260f7c7SSage Weil 21454260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21464260f7c7SSage Weil if (err) 21474260f7c7SSage Weil goto out_dput; 21485c39da5bSMiao Xie } 21494260f7c7SSage Weil 21505c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21514260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21524260f7c7SSage Weil if (err) 21534260f7c7SSage Weil goto out_dput; 21544260f7c7SSage Weil 215533345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 215676dda93cSYan, Zheng err = -EINVAL; 215776dda93cSYan, Zheng goto out_dput; 215876dda93cSYan, Zheng } 215976dda93cSYan, Zheng 216076dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 216176dda93cSYan, Zheng err = d_invalidate(dentry); 216276dda93cSYan, Zheng if (err) 216376dda93cSYan, Zheng goto out_unlock; 216476dda93cSYan, Zheng 216576dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 216676dda93cSYan, Zheng 216776dda93cSYan, Zheng err = may_destroy_subvol(dest); 216876dda93cSYan, Zheng if (err) 216976dda93cSYan, Zheng goto out_up_write; 217076dda93cSYan, Zheng 2171c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2172c58aaad2SMiao Xie /* 2173c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2174c58aaad2SMiao Xie * ref/backref. 2175c58aaad2SMiao Xie */ 2176c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2177c58aaad2SMiao Xie 5, &qgroup_reserved); 2178c58aaad2SMiao Xie if (err) 2179c58aaad2SMiao Xie goto out_up_write; 2180c58aaad2SMiao Xie 2181a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2182a22285a6SYan, Zheng if (IS_ERR(trans)) { 2183a22285a6SYan, Zheng err = PTR_ERR(trans); 2184c58aaad2SMiao Xie goto out_release; 2185a22285a6SYan, Zheng } 2186c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2187c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2188a22285a6SYan, Zheng 218976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 219076dda93cSYan, Zheng dest->root_key.objectid, 219176dda93cSYan, Zheng dentry->d_name.name, 219276dda93cSYan, Zheng dentry->d_name.len); 219379787eaaSJeff Mahoney if (ret) { 219479787eaaSJeff Mahoney err = ret; 219579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 219679787eaaSJeff Mahoney goto out_end_trans; 219779787eaaSJeff Mahoney } 219876dda93cSYan, Zheng 219976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 220076dda93cSYan, Zheng 220176dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 220276dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 220376dda93cSYan, Zheng dest->root_item.drop_level = 0; 220476dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 220576dda93cSYan, Zheng 2206d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 220776dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 220876dda93cSYan, Zheng root->fs_info->tree_root, 220976dda93cSYan, Zheng dest->root_key.objectid); 221079787eaaSJeff Mahoney if (ret) { 221179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 221279787eaaSJeff Mahoney err = ret; 221379787eaaSJeff Mahoney goto out_end_trans; 2214d68fc57bSYan, Zheng } 221579787eaaSJeff Mahoney } 221679787eaaSJeff Mahoney out_end_trans: 2217c58aaad2SMiao Xie trans->block_rsv = NULL; 2218c58aaad2SMiao Xie trans->bytes_reserved = 0; 2219531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 222079787eaaSJeff Mahoney if (ret && !err) 222179787eaaSJeff Mahoney err = ret; 222276dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2223c58aaad2SMiao Xie out_release: 2224c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 222576dda93cSYan, Zheng out_up_write: 222676dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 222776dda93cSYan, Zheng out_unlock: 222876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 222976dda93cSYan, Zheng if (!err) { 2230efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 223176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 223276dda93cSYan, Zheng d_delete(dentry); 2233fa6ac876SLiu Bo 2234fa6ac876SLiu Bo /* the last ref */ 2235fa6ac876SLiu Bo if (dest->cache_inode) { 2236fa6ac876SLiu Bo iput(dest->cache_inode); 2237fa6ac876SLiu Bo dest->cache_inode = NULL; 2238fa6ac876SLiu Bo } 223976dda93cSYan, Zheng } 224076dda93cSYan, Zheng out_dput: 224176dda93cSYan, Zheng dput(dentry); 224276dda93cSYan, Zheng out_unlock_dir: 224376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 22442a79f17eSAl Viro mnt_drop_write_file(file); 224576dda93cSYan, Zheng out: 224676dda93cSYan, Zheng kfree(vol_args); 224776dda93cSYan, Zheng return err; 224876dda93cSYan, Zheng } 224976dda93cSYan, Zheng 22501e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2251f46b5a66SChristoph Hellwig { 2252496ad9aaSAl Viro struct inode *inode = file_inode(file); 2253f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22541e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2255c146afadSYan Zheng int ret; 2256c146afadSYan Zheng 225725122d15SIlya Dryomov ret = mnt_want_write_file(file); 225825122d15SIlya Dryomov if (ret) 225925122d15SIlya Dryomov return ret; 2260b83cc969SLi Zefan 226125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 226225122d15SIlya Dryomov ret = -EROFS; 226325122d15SIlya Dryomov goto out; 22645ac00addSStefan Behrens } 2265f46b5a66SChristoph Hellwig 2266f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2267f46b5a66SChristoph Hellwig case S_IFDIR: 2268e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2269e441d54dSChris Mason ret = -EPERM; 2270e441d54dSChris Mason goto out; 2271e441d54dSChris Mason } 2272de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 22738929ecfaSYan, Zheng if (ret) 22748929ecfaSYan, Zheng goto out; 2275de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2276f46b5a66SChristoph Hellwig break; 2277f46b5a66SChristoph Hellwig case S_IFREG: 2278e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2279e441d54dSChris Mason ret = -EINVAL; 2280e441d54dSChris Mason goto out; 2281e441d54dSChris Mason } 22821e701a32SChris Mason 22831e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 22841e701a32SChris Mason if (!range) { 22851e701a32SChris Mason ret = -ENOMEM; 22861e701a32SChris Mason goto out; 22871e701a32SChris Mason } 22881e701a32SChris Mason 22891e701a32SChris Mason if (argp) { 22901e701a32SChris Mason if (copy_from_user(range, argp, 22911e701a32SChris Mason sizeof(*range))) { 22921e701a32SChris Mason ret = -EFAULT; 22931e701a32SChris Mason kfree(range); 2294683be16eSDan Carpenter goto out; 22951e701a32SChris Mason } 22961e701a32SChris Mason /* compression requires us to start the IO */ 22971e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 22981e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 22991e701a32SChris Mason range->extent_thresh = (u32)-1; 23001e701a32SChris Mason } 23011e701a32SChris Mason } else { 23021e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23031e701a32SChris Mason range->len = (u64)-1; 23041e701a32SChris Mason } 2305496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23064cb5300bSChris Mason range, 0, 0); 23074cb5300bSChris Mason if (ret > 0) 23084cb5300bSChris Mason ret = 0; 23091e701a32SChris Mason kfree(range); 2310f46b5a66SChristoph Hellwig break; 23118929ecfaSYan, Zheng default: 23128929ecfaSYan, Zheng ret = -EINVAL; 2313f46b5a66SChristoph Hellwig } 2314e441d54dSChris Mason out: 231525122d15SIlya Dryomov mnt_drop_write_file(file); 2316e441d54dSChris Mason return ret; 2317f46b5a66SChristoph Hellwig } 2318f46b5a66SChristoph Hellwig 2319b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2320f46b5a66SChristoph Hellwig { 2321f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2322f46b5a66SChristoph Hellwig int ret; 2323f46b5a66SChristoph Hellwig 2324e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2325e441d54dSChris Mason return -EPERM; 2326e441d54dSChris Mason 23275ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23285ac00addSStefan Behrens 1)) { 23295ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 23302c0c9da0SIlya Dryomov return -EINVAL; 2331c9e9f97bSIlya Dryomov } 2332c9e9f97bSIlya Dryomov 23335ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2334dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2335c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2336c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2337c9e9f97bSIlya Dryomov goto out; 2338c9e9f97bSIlya Dryomov } 2339f46b5a66SChristoph Hellwig 23405516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2341f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2342f46b5a66SChristoph Hellwig 2343f46b5a66SChristoph Hellwig kfree(vol_args); 2344c9e9f97bSIlya Dryomov out: 2345c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23465ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2347f46b5a66SChristoph Hellwig return ret; 2348f46b5a66SChristoph Hellwig } 2349f46b5a66SChristoph Hellwig 2350da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2351f46b5a66SChristoph Hellwig { 2352496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2353f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2354f46b5a66SChristoph Hellwig int ret; 2355f46b5a66SChristoph Hellwig 2356e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2357e441d54dSChris Mason return -EPERM; 2358e441d54dSChris Mason 2359da24927bSMiao Xie ret = mnt_want_write_file(file); 2360da24927bSMiao Xie if (ret) 2361da24927bSMiao Xie return ret; 2362c146afadSYan Zheng 2363dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2364c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2365c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2366c9e9f97bSIlya Dryomov goto out; 2367c9e9f97bSIlya Dryomov } 2368f46b5a66SChristoph Hellwig 23695516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2370f46b5a66SChristoph Hellwig 2371183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2372183860f6SAnand Jain 1)) { 2373183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2374183860f6SAnand Jain goto out; 2375183860f6SAnand Jain } 2376183860f6SAnand Jain 2377183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2378183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2379c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23805ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2381183860f6SAnand Jain 2382183860f6SAnand Jain out: 2383183860f6SAnand Jain kfree(vol_args); 23844ac20c70SIlya Dryomov mnt_drop_write_file(file); 2385f46b5a66SChristoph Hellwig return ret; 2386f46b5a66SChristoph Hellwig } 2387f46b5a66SChristoph Hellwig 2388475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2389475f6387SJan Schmidt { 2390027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2391475f6387SJan Schmidt struct btrfs_device *device; 2392475f6387SJan Schmidt struct btrfs_device *next; 2393475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2394027ed2f0SLi Zefan int ret = 0; 2395475f6387SJan Schmidt 2396475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2397475f6387SJan Schmidt return -EPERM; 2398475f6387SJan Schmidt 2399027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2400027ed2f0SLi Zefan if (!fi_args) 2401027ed2f0SLi Zefan return -ENOMEM; 2402027ed2f0SLi Zefan 2403027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2404027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2405475f6387SJan Schmidt 2406475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2407475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2408027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2409027ed2f0SLi Zefan fi_args->max_id = device->devid; 2410475f6387SJan Schmidt } 2411475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2412475f6387SJan Schmidt 2413027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2414027ed2f0SLi Zefan ret = -EFAULT; 2415475f6387SJan Schmidt 2416027ed2f0SLi Zefan kfree(fi_args); 2417027ed2f0SLi Zefan return ret; 2418475f6387SJan Schmidt } 2419475f6387SJan Schmidt 2420475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2421475f6387SJan Schmidt { 2422475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2423475f6387SJan Schmidt struct btrfs_device *dev; 2424475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2425475f6387SJan Schmidt int ret = 0; 2426475f6387SJan Schmidt char *s_uuid = NULL; 2427475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2428475f6387SJan Schmidt 2429475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2430475f6387SJan Schmidt return -EPERM; 2431475f6387SJan Schmidt 2432475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2433475f6387SJan Schmidt if (IS_ERR(di_args)) 2434475f6387SJan Schmidt return PTR_ERR(di_args); 2435475f6387SJan Schmidt 2436475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2437475f6387SJan Schmidt s_uuid = di_args->uuid; 2438475f6387SJan Schmidt 2439475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2440aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2441475f6387SJan Schmidt 2442475f6387SJan Schmidt if (!dev) { 2443475f6387SJan Schmidt ret = -ENODEV; 2444475f6387SJan Schmidt goto out; 2445475f6387SJan Schmidt } 2446475f6387SJan Schmidt 2447475f6387SJan Schmidt di_args->devid = dev->devid; 2448475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2449475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2450475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2451a27202fbSJim Meyering if (dev->name) { 2452606686eeSJosef Bacik struct rcu_string *name; 2453606686eeSJosef Bacik 2454606686eeSJosef Bacik rcu_read_lock(); 2455606686eeSJosef Bacik name = rcu_dereference(dev->name); 2456606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2457606686eeSJosef Bacik rcu_read_unlock(); 2458a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2459a27202fbSJim Meyering } else { 246099ba55adSStefan Behrens di_args->path[0] = '\0'; 2461a27202fbSJim Meyering } 2462475f6387SJan Schmidt 2463475f6387SJan Schmidt out: 246455793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2465475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2466475f6387SJan Schmidt ret = -EFAULT; 2467475f6387SJan Schmidt 2468475f6387SJan Schmidt kfree(di_args); 2469475f6387SJan Schmidt return ret; 2470475f6387SJan Schmidt } 2471475f6387SJan Schmidt 247276dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2473b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2474f46b5a66SChristoph Hellwig { 2475496ad9aaSAl Viro struct inode *inode = file_inode(file); 2476f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 24772903ff01SAl Viro struct fd src_file; 2478f46b5a66SChristoph Hellwig struct inode *src; 2479f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2480f46b5a66SChristoph Hellwig struct btrfs_path *path; 2481f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2482ae01a0abSYan Zheng char *buf; 2483ae01a0abSYan Zheng struct btrfs_key key; 2484f46b5a66SChristoph Hellwig u32 nritems; 2485f46b5a66SChristoph Hellwig int slot; 2486ae01a0abSYan Zheng int ret; 2487c5c9cd4dSSage Weil u64 len = olen; 2488c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2489d20f7043SChris Mason 2490c5c9cd4dSSage Weil /* 2491c5c9cd4dSSage Weil * TODO: 2492c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2493c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2494c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2495c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2496c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2497c5c9cd4dSSage Weil * they don't overlap)? 2498c5c9cd4dSSage Weil */ 2499c5c9cd4dSSage Weil 2500e441d54dSChris Mason /* the destination must be opened for writing */ 25012ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2502e441d54dSChris Mason return -EINVAL; 2503e441d54dSChris Mason 2504b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2505b83cc969SLi Zefan return -EROFS; 2506b83cc969SLi Zefan 2507a561be71SAl Viro ret = mnt_want_write_file(file); 2508c146afadSYan Zheng if (ret) 2509c146afadSYan Zheng return ret; 2510c146afadSYan Zheng 25112903ff01SAl Viro src_file = fdget(srcfd); 25122903ff01SAl Viro if (!src_file.file) { 2513ab67b7c1SYan Zheng ret = -EBADF; 2514ab67b7c1SYan Zheng goto out_drop_write; 2515ab67b7c1SYan Zheng } 25165dc64164SDan Rosenberg 2517362a20c5SDavid Sterba ret = -EXDEV; 25182903ff01SAl Viro if (src_file.file->f_path.mnt != file->f_path.mnt) 2519362a20c5SDavid Sterba goto out_fput; 2520362a20c5SDavid Sterba 2521496ad9aaSAl Viro src = file_inode(src_file.file); 2522f46b5a66SChristoph Hellwig 2523c5c9cd4dSSage Weil ret = -EINVAL; 2524c5c9cd4dSSage Weil if (src == inode) 2525c5c9cd4dSSage Weil goto out_fput; 2526c5c9cd4dSSage Weil 25275dc64164SDan Rosenberg /* the src must be open for reading */ 25282903ff01SAl Viro if (!(src_file.file->f_mode & FMODE_READ)) 25295dc64164SDan Rosenberg goto out_fput; 25305dc64164SDan Rosenberg 25310e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 25320e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 25330e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 25340e7b824cSLi Zefan goto out_fput; 25350e7b824cSLi Zefan 2536ae01a0abSYan Zheng ret = -EISDIR; 2537ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2538f46b5a66SChristoph Hellwig goto out_fput; 2539f46b5a66SChristoph Hellwig 2540ae01a0abSYan Zheng ret = -EXDEV; 2541362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2542ae01a0abSYan Zheng goto out_fput; 2543ae01a0abSYan Zheng 2544ae01a0abSYan Zheng ret = -ENOMEM; 2545ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2546ae01a0abSYan Zheng if (!buf) 2547ae01a0abSYan Zheng goto out_fput; 2548ae01a0abSYan Zheng 2549ae01a0abSYan Zheng path = btrfs_alloc_path(); 2550ae01a0abSYan Zheng if (!path) { 2551ae01a0abSYan Zheng vfree(buf); 2552ae01a0abSYan Zheng goto out_fput; 2553ae01a0abSYan Zheng } 2554ae01a0abSYan Zheng path->reada = 2; 2555ae01a0abSYan Zheng 2556f46b5a66SChristoph Hellwig if (inode < src) { 2557fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2558fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2559f46b5a66SChristoph Hellwig } else { 2560fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2561fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2562f46b5a66SChristoph Hellwig } 2563f46b5a66SChristoph Hellwig 2564c5c9cd4dSSage Weil /* determine range to clone */ 2565c5c9cd4dSSage Weil ret = -EINVAL; 25662ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2567f46b5a66SChristoph Hellwig goto out_unlock; 2568c5c9cd4dSSage Weil if (len == 0) 2569c5c9cd4dSSage Weil olen = len = src->i_size - off; 2570c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2571c5c9cd4dSSage Weil if (off + len == src->i_size) 25722a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2573c5c9cd4dSSage Weil 2574c5c9cd4dSSage Weil /* verify the end result is block aligned */ 25752a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 25762a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2577c5c9cd4dSSage Weil goto out_unlock; 2578c5c9cd4dSSage Weil 2579d525e8abSLi Zefan if (destoff > inode->i_size) { 2580d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2581d525e8abSLi Zefan if (ret) 2582d525e8abSLi Zefan goto out_unlock; 2583d525e8abSLi Zefan } 2584d525e8abSLi Zefan 258571ef0786SLi Zefan /* truncate page cache pages from target inode range */ 258671ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 258771ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 258871ef0786SLi Zefan 2589f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2590f46b5a66SChristoph Hellwig another, and lock file content */ 2591f46b5a66SChristoph Hellwig while (1) { 259231840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2593aa42ffd9SLiu Bo lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2594aa42ffd9SLiu Bo ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); 25959a019196SSage Weil if (!ordered && 2596aa42ffd9SLiu Bo !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, 25979a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2598f46b5a66SChristoph Hellwig break; 2599aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2600ae01a0abSYan Zheng if (ordered) 2601ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 26029a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2603f46b5a66SChristoph Hellwig } 2604f46b5a66SChristoph Hellwig 2605c5c9cd4dSSage Weil /* clone data */ 260633345d01SLi Zefan key.objectid = btrfs_ino(src); 2607ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2608ae01a0abSYan Zheng key.offset = 0; 2609f46b5a66SChristoph Hellwig 2610f46b5a66SChristoph Hellwig while (1) { 2611f46b5a66SChristoph Hellwig /* 2612f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2613f46b5a66SChristoph Hellwig * tree. 2614f46b5a66SChristoph Hellwig */ 2615362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2616362a20c5SDavid Sterba 0, 0); 2617f46b5a66SChristoph Hellwig if (ret < 0) 2618f46b5a66SChristoph Hellwig goto out; 2619f46b5a66SChristoph Hellwig 2620ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2621ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2622362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2623f46b5a66SChristoph Hellwig if (ret < 0) 2624f46b5a66SChristoph Hellwig goto out; 2625f46b5a66SChristoph Hellwig if (ret > 0) 2626f46b5a66SChristoph Hellwig break; 2627ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2628f46b5a66SChristoph Hellwig } 2629f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2630f46b5a66SChristoph Hellwig slot = path->slots[0]; 2631f46b5a66SChristoph Hellwig 2632ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2633d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 263433345d01SLi Zefan key.objectid != btrfs_ino(src)) 2635f46b5a66SChristoph Hellwig break; 2636f46b5a66SChristoph Hellwig 2637c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2638c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2639c5c9cd4dSSage Weil int type; 264031840ae1SZheng Yan u32 size; 264131840ae1SZheng Yan struct btrfs_key new_key; 2642c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2643c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2644c5c9cd4dSSage Weil u8 comp; 2645b5384d48SSage Weil u64 endoff; 264631840ae1SZheng Yan 264731840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 264831840ae1SZheng Yan read_extent_buffer(leaf, buf, 264931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 265031840ae1SZheng Yan size); 2651c5c9cd4dSSage Weil 2652c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2653c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2654c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2655c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2656c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2657c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2658d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2659d397712bSChris Mason extent); 2660d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2661d397712bSChris Mason extent); 2662c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2663d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2664d397712bSChris Mason extent); 2665c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2666c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2667c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2668c5c9cd4dSSage Weil extent); 2669c5c9cd4dSSage Weil } 2670b3b4aa74SDavid Sterba btrfs_release_path(path); 267131840ae1SZheng Yan 2672050006a7SSage Weil if (key.offset + datal <= off || 2673aa42ffd9SLiu Bo key.offset >= off + len - 1) 2674c5c9cd4dSSage Weil goto next; 2675c5c9cd4dSSage Weil 267631840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 267733345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 26784d728ec7SLi Zefan if (off <= key.offset) 2679c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 26804d728ec7SLi Zefan else 26814d728ec7SLi Zefan new_key.offset = destoff; 2682c5c9cd4dSSage Weil 2683b6f3409bSSage Weil /* 2684b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2685b6f3409bSSage Weil * 1 - add new extent 2686b6f3409bSSage Weil * 1 - inode update 2687b6f3409bSSage Weil */ 2688b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2689a22285a6SYan, Zheng if (IS_ERR(trans)) { 2690a22285a6SYan, Zheng ret = PTR_ERR(trans); 2691a22285a6SYan, Zheng goto out; 2692a22285a6SYan, Zheng } 2693a22285a6SYan, Zheng 2694c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2695c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2696d72c0842SLi Zefan /* 2697d72c0842SLi Zefan * a | --- range to clone ---| b 2698d72c0842SLi Zefan * | ------------- extent ------------- | 2699d72c0842SLi Zefan */ 2700d72c0842SLi Zefan 2701d72c0842SLi Zefan /* substract range b */ 2702d72c0842SLi Zefan if (key.offset + datal > off + len) 2703d72c0842SLi Zefan datal = off + len - key.offset; 2704d72c0842SLi Zefan 2705d72c0842SLi Zefan /* substract range a */ 2706a22285a6SYan, Zheng if (off > key.offset) { 2707a22285a6SYan, Zheng datao += off - key.offset; 2708a22285a6SYan, Zheng datal -= off - key.offset; 2709a22285a6SYan, Zheng } 2710a22285a6SYan, Zheng 27115dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2712a22285a6SYan, Zheng new_key.offset, 2713a22285a6SYan, Zheng new_key.offset + datal, 27142671485dSJosef Bacik 1); 271579787eaaSJeff Mahoney if (ret) { 271679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 271779787eaaSJeff Mahoney ret); 271879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 271979787eaaSJeff Mahoney goto out; 272079787eaaSJeff Mahoney } 2721a22285a6SYan, Zheng 272231840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 272331840ae1SZheng Yan &new_key, size); 272479787eaaSJeff Mahoney if (ret) { 272579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 272679787eaaSJeff Mahoney ret); 272779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 272879787eaaSJeff Mahoney goto out; 272979787eaaSJeff Mahoney } 273031840ae1SZheng Yan 273131840ae1SZheng Yan leaf = path->nodes[0]; 273231840ae1SZheng Yan slot = path->slots[0]; 273331840ae1SZheng Yan write_extent_buffer(leaf, buf, 273431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 273531840ae1SZheng Yan size); 2736ae01a0abSYan Zheng 2737f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2738f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2739c5c9cd4dSSage Weil 2740c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2741c5c9cd4dSSage Weil if (!disko) 2742c5c9cd4dSSage Weil datao = 0; 2743c5c9cd4dSSage Weil 2744c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2745c5c9cd4dSSage Weil datao); 2746c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2747c5c9cd4dSSage Weil datal); 2748c5c9cd4dSSage Weil if (disko) { 2749c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2750ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 27515d4f98a2SYan Zheng disko, diskl, 0, 2752f46b5a66SChristoph Hellwig root->root_key.objectid, 275333345d01SLi Zefan btrfs_ino(inode), 275466d7e7f0SArne Jansen new_key.offset - datao, 275566d7e7f0SArne Jansen 0); 275679787eaaSJeff Mahoney if (ret) { 275779787eaaSJeff Mahoney btrfs_abort_transaction(trans, 275879787eaaSJeff Mahoney root, 275979787eaaSJeff Mahoney ret); 276079787eaaSJeff Mahoney btrfs_end_transaction(trans, 276179787eaaSJeff Mahoney root); 276279787eaaSJeff Mahoney goto out; 276379787eaaSJeff Mahoney 276479787eaaSJeff Mahoney } 2765f46b5a66SChristoph Hellwig } 2766c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2767c5c9cd4dSSage Weil u64 skip = 0; 2768c5c9cd4dSSage Weil u64 trim = 0; 2769c5c9cd4dSSage Weil if (off > key.offset) { 2770c5c9cd4dSSage Weil skip = off - key.offset; 2771c5c9cd4dSSage Weil new_key.offset += skip; 277231840ae1SZheng Yan } 2773d397712bSChris Mason 2774c5c9cd4dSSage Weil if (key.offset + datal > off + len) 2775c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 2776d397712bSChris Mason 2777c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2778c5c9cd4dSSage Weil ret = -EINVAL; 2779a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2780c5c9cd4dSSage Weil goto out; 278131840ae1SZheng Yan } 2782c5c9cd4dSSage Weil size -= skip + trim; 2783c5c9cd4dSSage Weil datal -= skip + trim; 2784a22285a6SYan, Zheng 27855dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2786a22285a6SYan, Zheng new_key.offset, 2787a22285a6SYan, Zheng new_key.offset + datal, 27882671485dSJosef Bacik 1); 278979787eaaSJeff Mahoney if (ret) { 279079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 279179787eaaSJeff Mahoney ret); 279279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 279379787eaaSJeff Mahoney goto out; 279479787eaaSJeff Mahoney } 2795a22285a6SYan, Zheng 2796c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2797c5c9cd4dSSage Weil &new_key, size); 279879787eaaSJeff Mahoney if (ret) { 279979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 280079787eaaSJeff Mahoney ret); 280179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 280279787eaaSJeff Mahoney goto out; 280379787eaaSJeff Mahoney } 2804c5c9cd4dSSage Weil 2805c5c9cd4dSSage Weil if (skip) { 2806d397712bSChris Mason u32 start = 2807d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2808c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2809c5c9cd4dSSage Weil datal); 2810c5c9cd4dSSage Weil } 2811c5c9cd4dSSage Weil 2812c5c9cd4dSSage Weil leaf = path->nodes[0]; 2813c5c9cd4dSSage Weil slot = path->slots[0]; 2814c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2815c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2816c5c9cd4dSSage Weil size); 2817c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2818c5c9cd4dSSage Weil } 2819c5c9cd4dSSage Weil 2820c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2821b3b4aa74SDavid Sterba btrfs_release_path(path); 2822c5c9cd4dSSage Weil 28230c4d2d95SJosef Bacik inode_inc_iversion(inode); 2824a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2825b5384d48SSage Weil 2826b5384d48SSage Weil /* 2827b5384d48SSage Weil * we round up to the block size at eof when 2828b5384d48SSage Weil * determining which extents to clone above, 2829b5384d48SSage Weil * but shouldn't round up the file size 2830b5384d48SSage Weil */ 2831b5384d48SSage Weil endoff = new_key.offset + datal; 28325f3888ffSLi Zefan if (endoff > destoff+olen) 28335f3888ffSLi Zefan endoff = destoff+olen; 2834b5384d48SSage Weil if (endoff > inode->i_size) 2835b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2836b5384d48SSage Weil 2837a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 283879787eaaSJeff Mahoney if (ret) { 283979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2840a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 284179787eaaSJeff Mahoney goto out; 284279787eaaSJeff Mahoney } 284379787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2844a22285a6SYan, Zheng } 2845c5c9cd4dSSage Weil next: 2846b3b4aa74SDavid Sterba btrfs_release_path(path); 2847ae01a0abSYan Zheng key.offset++; 2848ae01a0abSYan Zheng } 2849f46b5a66SChristoph Hellwig ret = 0; 2850f46b5a66SChristoph Hellwig out: 2851b3b4aa74SDavid Sterba btrfs_release_path(path); 2852aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2853f46b5a66SChristoph Hellwig out_unlock: 2854f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2855f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2856ae01a0abSYan Zheng vfree(buf); 2857ae01a0abSYan Zheng btrfs_free_path(path); 2858f46b5a66SChristoph Hellwig out_fput: 28592903ff01SAl Viro fdput(src_file); 2860ab67b7c1SYan Zheng out_drop_write: 28612a79f17eSAl Viro mnt_drop_write_file(file); 2862f46b5a66SChristoph Hellwig return ret; 2863f46b5a66SChristoph Hellwig } 2864f46b5a66SChristoph Hellwig 28657a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2866c5c9cd4dSSage Weil { 2867c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2868c5c9cd4dSSage Weil 28697a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2870c5c9cd4dSSage Weil return -EFAULT; 2871c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2872c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2873c5c9cd4dSSage Weil } 2874c5c9cd4dSSage Weil 2875f46b5a66SChristoph Hellwig /* 2876f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2877f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2878f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2879f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2880f46b5a66SChristoph Hellwig */ 2881b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2882f46b5a66SChristoph Hellwig { 2883496ad9aaSAl Viro struct inode *inode = file_inode(file); 2884f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2885f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 28861ab86aedSSage Weil int ret; 2887f46b5a66SChristoph Hellwig 28881ab86aedSSage Weil ret = -EPERM; 2889df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2890f46b5a66SChristoph Hellwig goto out; 28911ab86aedSSage Weil 28921ab86aedSSage Weil ret = -EINPROGRESS; 28931ab86aedSSage Weil if (file->private_data) 28941ab86aedSSage Weil goto out; 28959ca9ee09SSage Weil 2896b83cc969SLi Zefan ret = -EROFS; 2897b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2898b83cc969SLi Zefan goto out; 2899b83cc969SLi Zefan 2900a561be71SAl Viro ret = mnt_want_write_file(file); 2901c146afadSYan Zheng if (ret) 2902c146afadSYan Zheng goto out; 2903c146afadSYan Zheng 2904a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 29059ca9ee09SSage Weil 2906f46b5a66SChristoph Hellwig ret = -ENOMEM; 29077a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2908abd30bb0STsutomu Itoh if (IS_ERR(trans)) 29091ab86aedSSage Weil goto out_drop; 29101ab86aedSSage Weil 29111ab86aedSSage Weil file->private_data = trans; 29121ab86aedSSage Weil return 0; 29131ab86aedSSage Weil 29141ab86aedSSage Weil out_drop: 2915a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29162a79f17eSAl Viro mnt_drop_write_file(file); 2917f46b5a66SChristoph Hellwig out: 2918f46b5a66SChristoph Hellwig return ret; 2919f46b5a66SChristoph Hellwig } 2920f46b5a66SChristoph Hellwig 29216ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 29226ef5ed0dSJosef Bacik { 2923496ad9aaSAl Viro struct inode *inode = file_inode(file); 29246ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 29256ef5ed0dSJosef Bacik struct btrfs_root *new_root; 29266ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 29276ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 29286ef5ed0dSJosef Bacik struct btrfs_path *path; 29296ef5ed0dSJosef Bacik struct btrfs_key location; 29306ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 29316ef5ed0dSJosef Bacik u64 objectid = 0; 29326ef5ed0dSJosef Bacik u64 dir_id; 29333c04ce01SMiao Xie int ret; 29346ef5ed0dSJosef Bacik 29356ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 29366ef5ed0dSJosef Bacik return -EPERM; 29376ef5ed0dSJosef Bacik 29383c04ce01SMiao Xie ret = mnt_want_write_file(file); 29393c04ce01SMiao Xie if (ret) 29403c04ce01SMiao Xie return ret; 29413c04ce01SMiao Xie 29423c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29433c04ce01SMiao Xie ret = -EFAULT; 29443c04ce01SMiao Xie goto out; 29453c04ce01SMiao Xie } 29466ef5ed0dSJosef Bacik 29476ef5ed0dSJosef Bacik if (!objectid) 29486ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 29496ef5ed0dSJosef Bacik 29506ef5ed0dSJosef Bacik location.objectid = objectid; 29516ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 29526ef5ed0dSJosef Bacik location.offset = (u64)-1; 29536ef5ed0dSJosef Bacik 29546ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 29553c04ce01SMiao Xie if (IS_ERR(new_root)) { 29563c04ce01SMiao Xie ret = PTR_ERR(new_root); 29573c04ce01SMiao Xie goto out; 29583c04ce01SMiao Xie } 29596ef5ed0dSJosef Bacik 29606ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29613c04ce01SMiao Xie if (!path) { 29623c04ce01SMiao Xie ret = -ENOMEM; 29633c04ce01SMiao Xie goto out; 29643c04ce01SMiao Xie } 29656ef5ed0dSJosef Bacik path->leave_spinning = 1; 29666ef5ed0dSJosef Bacik 29676ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 296898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29696ef5ed0dSJosef Bacik btrfs_free_path(path); 29703c04ce01SMiao Xie ret = PTR_ERR(trans); 29713c04ce01SMiao Xie goto out; 29726ef5ed0dSJosef Bacik } 29736ef5ed0dSJosef Bacik 29746c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 29756ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 29766ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2977cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29786ef5ed0dSJosef Bacik btrfs_free_path(path); 29796ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29806ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 29816ef5ed0dSJosef Bacik "this isn't going to work\n"); 29823c04ce01SMiao Xie ret = -ENOENT; 29833c04ce01SMiao Xie goto out; 29846ef5ed0dSJosef Bacik } 29856ef5ed0dSJosef Bacik 29866ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29876ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29886ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29896ef5ed0dSJosef Bacik btrfs_free_path(path); 29906ef5ed0dSJosef Bacik 29912b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 29926ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29933c04ce01SMiao Xie out: 29943c04ce01SMiao Xie mnt_drop_write_file(file); 29953c04ce01SMiao Xie return ret; 29966ef5ed0dSJosef Bacik } 29976ef5ed0dSJosef Bacik 29985af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 2999bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3000bf5fc093SJosef Bacik { 3001bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3002bf5fc093SJosef Bacik 3003bf5fc093SJosef Bacik space->total_bytes = 0; 3004bf5fc093SJosef Bacik space->used_bytes = 0; 3005bf5fc093SJosef Bacik space->flags = 0; 3006bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3007bf5fc093SJosef Bacik space->flags = block_group->flags; 3008bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3009bf5fc093SJosef Bacik space->used_bytes += 3010bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3011bf5fc093SJosef Bacik } 3012bf5fc093SJosef Bacik } 3013bf5fc093SJosef Bacik 301448a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 30151406e432SJosef Bacik { 30161406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 30171406e432SJosef Bacik struct btrfs_ioctl_space_info space; 30181406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 30197fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 302013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 30211406e432SJosef Bacik struct btrfs_space_info *info; 3022bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3023bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3024bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3025bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3026bf5fc093SJosef Bacik int num_types = 4; 30277fde62bfSChris Mason int alloc_size; 30281406e432SJosef Bacik int ret = 0; 302951788b1bSDan Rosenberg u64 slot_count = 0; 3030bf5fc093SJosef Bacik int i, c; 30311406e432SJosef Bacik 30321406e432SJosef Bacik if (copy_from_user(&space_args, 30331406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 30341406e432SJosef Bacik sizeof(space_args))) 30351406e432SJosef Bacik return -EFAULT; 30361406e432SJosef Bacik 3037bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3038bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3039bf5fc093SJosef Bacik 3040bf5fc093SJosef Bacik info = NULL; 30417fde62bfSChris Mason rcu_read_lock(); 3042bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3043bf5fc093SJosef Bacik list) { 3044bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3045bf5fc093SJosef Bacik info = tmp; 3046bf5fc093SJosef Bacik break; 3047bf5fc093SJosef Bacik } 3048bf5fc093SJosef Bacik } 30497fde62bfSChris Mason rcu_read_unlock(); 30501406e432SJosef Bacik 3051bf5fc093SJosef Bacik if (!info) 3052bf5fc093SJosef Bacik continue; 3053bf5fc093SJosef Bacik 3054bf5fc093SJosef Bacik down_read(&info->groups_sem); 3055bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3056bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3057bf5fc093SJosef Bacik slot_count++; 3058bf5fc093SJosef Bacik } 3059bf5fc093SJosef Bacik up_read(&info->groups_sem); 3060bf5fc093SJosef Bacik } 3061bf5fc093SJosef Bacik 30627fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30637fde62bfSChris Mason if (space_args.space_slots == 0) { 30647fde62bfSChris Mason space_args.total_spaces = slot_count; 30657fde62bfSChris Mason goto out; 30667fde62bfSChris Mason } 3067bf5fc093SJosef Bacik 306851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3069bf5fc093SJosef Bacik 30707fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3071bf5fc093SJosef Bacik 30727fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30737fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30747fde62bfSChris Mason */ 30757fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 30767fde62bfSChris Mason return -ENOMEM; 30777fde62bfSChris Mason 30787fde62bfSChris Mason space_args.total_spaces = 0; 30797fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 30807fde62bfSChris Mason if (!dest) 30817fde62bfSChris Mason return -ENOMEM; 30827fde62bfSChris Mason dest_orig = dest; 30837fde62bfSChris Mason 30847fde62bfSChris Mason /* now we have a buffer to copy into */ 3085bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3086bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3087bf5fc093SJosef Bacik 308851788b1bSDan Rosenberg if (!slot_count) 308951788b1bSDan Rosenberg break; 309051788b1bSDan Rosenberg 3091bf5fc093SJosef Bacik info = NULL; 30921406e432SJosef Bacik rcu_read_lock(); 3093bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3094bf5fc093SJosef Bacik list) { 3095bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3096bf5fc093SJosef Bacik info = tmp; 30977fde62bfSChris Mason break; 3098bf5fc093SJosef Bacik } 3099bf5fc093SJosef Bacik } 3100bf5fc093SJosef Bacik rcu_read_unlock(); 31017fde62bfSChris Mason 3102bf5fc093SJosef Bacik if (!info) 3103bf5fc093SJosef Bacik continue; 3104bf5fc093SJosef Bacik down_read(&info->groups_sem); 3105bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3106bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 31075af3e8ccSStefan Behrens btrfs_get_block_group_info( 31085af3e8ccSStefan Behrens &info->block_groups[c], &space); 31097fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 31101406e432SJosef Bacik dest++; 31111406e432SJosef Bacik space_args.total_spaces++; 311251788b1bSDan Rosenberg slot_count--; 31131406e432SJosef Bacik } 311451788b1bSDan Rosenberg if (!slot_count) 311551788b1bSDan Rosenberg break; 3116bf5fc093SJosef Bacik } 3117bf5fc093SJosef Bacik up_read(&info->groups_sem); 3118bf5fc093SJosef Bacik } 31191406e432SJosef Bacik 31202eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 31217fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 31227fde62bfSChris Mason 31237fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 31247fde62bfSChris Mason ret = -EFAULT; 31257fde62bfSChris Mason 31267fde62bfSChris Mason kfree(dest_orig); 31277fde62bfSChris Mason out: 31287fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31291406e432SJosef Bacik ret = -EFAULT; 31301406e432SJosef Bacik 31311406e432SJosef Bacik return ret; 31321406e432SJosef Bacik } 31331406e432SJosef Bacik 3134f46b5a66SChristoph Hellwig /* 3135f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3136f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3137f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3138f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3139f46b5a66SChristoph Hellwig */ 3140f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3141f46b5a66SChristoph Hellwig { 3142496ad9aaSAl Viro struct inode *inode = file_inode(file); 3143f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3144f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3145f46b5a66SChristoph Hellwig 3146f46b5a66SChristoph Hellwig trans = file->private_data; 31471ab86aedSSage Weil if (!trans) 31481ab86aedSSage Weil return -EINVAL; 3149b214107eSChristoph Hellwig file->private_data = NULL; 31509ca9ee09SSage Weil 31511ab86aedSSage Weil btrfs_end_transaction(trans, root); 31521ab86aedSSage Weil 3153a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 31549ca9ee09SSage Weil 31552a79f17eSAl Viro mnt_drop_write_file(file); 31561ab86aedSSage Weil return 0; 3157f46b5a66SChristoph Hellwig } 3158f46b5a66SChristoph Hellwig 31599a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31609a8c28beSMiao Xie void __user *argp) 316146204592SSage Weil { 316246204592SSage Weil struct btrfs_trans_handle *trans; 316346204592SSage Weil u64 transid; 3164db5b493aSTsutomu Itoh int ret; 316546204592SSage Weil 3166d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3167ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3168ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 316998d5dc13STsutomu Itoh return PTR_ERR(trans); 3170ff7c1d33SMiao Xie 3171ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3172ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3173ff7c1d33SMiao Xie goto out; 3174ff7c1d33SMiao Xie } 317546204592SSage Weil transid = trans->transid; 3176db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 31778b2b2d3cSTsutomu Itoh if (ret) { 31788b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3179db5b493aSTsutomu Itoh return ret; 31808b2b2d3cSTsutomu Itoh } 3181ff7c1d33SMiao Xie out: 318246204592SSage Weil if (argp) 318346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 318446204592SSage Weil return -EFAULT; 318546204592SSage Weil return 0; 318646204592SSage Weil } 318746204592SSage Weil 31889a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 31899a8c28beSMiao Xie void __user *argp) 319046204592SSage Weil { 319146204592SSage Weil u64 transid; 319246204592SSage Weil 319346204592SSage Weil if (argp) { 319446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 319546204592SSage Weil return -EFAULT; 319646204592SSage Weil } else { 319746204592SSage Weil transid = 0; /* current trans */ 319846204592SSage Weil } 319946204592SSage Weil return btrfs_wait_for_commit(root, transid); 320046204592SSage Weil } 320146204592SSage Weil 3202b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3203475f6387SJan Schmidt { 3204496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3205475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3206b8e95489SMiao Xie int ret; 3207475f6387SJan Schmidt 3208475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3209475f6387SJan Schmidt return -EPERM; 3210475f6387SJan Schmidt 3211475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3212475f6387SJan Schmidt if (IS_ERR(sa)) 3213475f6387SJan Schmidt return PTR_ERR(sa); 3214475f6387SJan Schmidt 3215b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3216b8e95489SMiao Xie ret = mnt_want_write_file(file); 3217b8e95489SMiao Xie if (ret) 3218b8e95489SMiao Xie goto out; 3219b8e95489SMiao Xie } 3220b8e95489SMiao Xie 3221aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 322263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 322363a212abSStefan Behrens 0); 3224475f6387SJan Schmidt 3225475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3226475f6387SJan Schmidt ret = -EFAULT; 3227475f6387SJan Schmidt 3228b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3229b8e95489SMiao Xie mnt_drop_write_file(file); 3230b8e95489SMiao Xie out: 3231475f6387SJan Schmidt kfree(sa); 3232475f6387SJan Schmidt return ret; 3233475f6387SJan Schmidt } 3234475f6387SJan Schmidt 3235475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3236475f6387SJan Schmidt { 3237475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3238475f6387SJan Schmidt return -EPERM; 3239475f6387SJan Schmidt 3240aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3241475f6387SJan Schmidt } 3242475f6387SJan Schmidt 3243475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3244475f6387SJan Schmidt void __user *arg) 3245475f6387SJan Schmidt { 3246475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3247475f6387SJan Schmidt int ret; 3248475f6387SJan Schmidt 3249475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3250475f6387SJan Schmidt return -EPERM; 3251475f6387SJan Schmidt 3252475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3253475f6387SJan Schmidt if (IS_ERR(sa)) 3254475f6387SJan Schmidt return PTR_ERR(sa); 3255475f6387SJan Schmidt 3256475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3257475f6387SJan Schmidt 3258475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3259475f6387SJan Schmidt ret = -EFAULT; 3260475f6387SJan Schmidt 3261475f6387SJan Schmidt kfree(sa); 3262475f6387SJan Schmidt return ret; 3263475f6387SJan Schmidt } 3264475f6387SJan Schmidt 3265c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3266b27f7c0cSDavid Sterba void __user *arg) 3267c11d2c23SStefan Behrens { 3268c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3269c11d2c23SStefan Behrens int ret; 3270c11d2c23SStefan Behrens 3271c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3272c11d2c23SStefan Behrens if (IS_ERR(sa)) 3273c11d2c23SStefan Behrens return PTR_ERR(sa); 3274c11d2c23SStefan Behrens 3275b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3276b27f7c0cSDavid Sterba kfree(sa); 3277b27f7c0cSDavid Sterba return -EPERM; 3278b27f7c0cSDavid Sterba } 3279b27f7c0cSDavid Sterba 3280b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3281c11d2c23SStefan Behrens 3282c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3283c11d2c23SStefan Behrens ret = -EFAULT; 3284c11d2c23SStefan Behrens 3285c11d2c23SStefan Behrens kfree(sa); 3286c11d2c23SStefan Behrens return ret; 3287c11d2c23SStefan Behrens } 3288c11d2c23SStefan Behrens 32893f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 32903f6bcfbdSStefan Behrens { 32913f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32923f6bcfbdSStefan Behrens int ret; 32933f6bcfbdSStefan Behrens 32943f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32953f6bcfbdSStefan Behrens return -EPERM; 32963f6bcfbdSStefan Behrens 32973f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32983f6bcfbdSStefan Behrens if (IS_ERR(p)) 32993f6bcfbdSStefan Behrens return PTR_ERR(p); 33003f6bcfbdSStefan Behrens 33013f6bcfbdSStefan Behrens switch (p->cmd) { 33023f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 33033f6bcfbdSStefan Behrens if (atomic_xchg( 33043f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33053f6bcfbdSStefan Behrens 1)) { 33063f6bcfbdSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 33073f6bcfbdSStefan Behrens ret = -EINPROGRESS; 33083f6bcfbdSStefan Behrens } else { 33093f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 33103f6bcfbdSStefan Behrens atomic_set( 33113f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33123f6bcfbdSStefan Behrens 0); 33133f6bcfbdSStefan Behrens } 33143f6bcfbdSStefan Behrens break; 33153f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 33163f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 33173f6bcfbdSStefan Behrens ret = 0; 33183f6bcfbdSStefan Behrens break; 33193f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 33203f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 33213f6bcfbdSStefan Behrens break; 33223f6bcfbdSStefan Behrens default: 33233f6bcfbdSStefan Behrens ret = -EINVAL; 33243f6bcfbdSStefan Behrens break; 33253f6bcfbdSStefan Behrens } 33263f6bcfbdSStefan Behrens 33273f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 33283f6bcfbdSStefan Behrens ret = -EFAULT; 33293f6bcfbdSStefan Behrens 33303f6bcfbdSStefan Behrens kfree(p); 33313f6bcfbdSStefan Behrens return ret; 33323f6bcfbdSStefan Behrens } 33333f6bcfbdSStefan Behrens 3334d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3335d7728c96SJan Schmidt { 3336d7728c96SJan Schmidt int ret = 0; 3337d7728c96SJan Schmidt int i; 3338740c3d22SChris Mason u64 rel_ptr; 3339d7728c96SJan Schmidt int size; 3340806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3341d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3342d7728c96SJan Schmidt struct btrfs_path *path; 3343d7728c96SJan Schmidt 334482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3345d7728c96SJan Schmidt return -EPERM; 3346d7728c96SJan Schmidt 3347d7728c96SJan Schmidt path = btrfs_alloc_path(); 3348d7728c96SJan Schmidt if (!path) { 3349d7728c96SJan Schmidt ret = -ENOMEM; 3350d7728c96SJan Schmidt goto out; 3351d7728c96SJan Schmidt } 3352d7728c96SJan Schmidt 3353d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3354d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3355d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3356d7728c96SJan Schmidt ipa = NULL; 3357d7728c96SJan Schmidt goto out; 3358d7728c96SJan Schmidt } 3359d7728c96SJan Schmidt 3360d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3361d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3362d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3363d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3364d7728c96SJan Schmidt ipath = NULL; 3365d7728c96SJan Schmidt goto out; 3366d7728c96SJan Schmidt } 3367d7728c96SJan Schmidt 3368d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3369d7728c96SJan Schmidt if (ret < 0) 3370d7728c96SJan Schmidt goto out; 3371d7728c96SJan Schmidt 3372d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3373745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3374745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3375740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3376d7728c96SJan Schmidt } 3377d7728c96SJan Schmidt 3378745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3379745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3380d7728c96SJan Schmidt if (ret) { 3381d7728c96SJan Schmidt ret = -EFAULT; 3382d7728c96SJan Schmidt goto out; 3383d7728c96SJan Schmidt } 3384d7728c96SJan Schmidt 3385d7728c96SJan Schmidt out: 3386d7728c96SJan Schmidt btrfs_free_path(path); 3387d7728c96SJan Schmidt free_ipath(ipath); 3388d7728c96SJan Schmidt kfree(ipa); 3389d7728c96SJan Schmidt 3390d7728c96SJan Schmidt return ret; 3391d7728c96SJan Schmidt } 3392d7728c96SJan Schmidt 3393d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3394d7728c96SJan Schmidt { 3395d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3396d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3397d7728c96SJan Schmidt 3398d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3399d7728c96SJan Schmidt inodes->bytes_left -= c; 3400d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3401d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3402d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3403d7728c96SJan Schmidt inodes->elem_cnt += 3; 3404d7728c96SJan Schmidt } else { 3405d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3406d7728c96SJan Schmidt inodes->bytes_left = 0; 3407d7728c96SJan Schmidt inodes->elem_missed += 3; 3408d7728c96SJan Schmidt } 3409d7728c96SJan Schmidt 3410d7728c96SJan Schmidt return 0; 3411d7728c96SJan Schmidt } 3412d7728c96SJan Schmidt 3413d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3414d7728c96SJan Schmidt void __user *arg) 3415d7728c96SJan Schmidt { 3416d7728c96SJan Schmidt int ret = 0; 3417d7728c96SJan Schmidt int size; 3418d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3419d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3420d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3421d7728c96SJan Schmidt 3422d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3423d7728c96SJan Schmidt return -EPERM; 3424d7728c96SJan Schmidt 3425d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3426d7728c96SJan Schmidt if (IS_ERR(loi)) { 3427d7728c96SJan Schmidt ret = PTR_ERR(loi); 3428d7728c96SJan Schmidt loi = NULL; 3429d7728c96SJan Schmidt goto out; 3430d7728c96SJan Schmidt } 3431d7728c96SJan Schmidt 3432d7728c96SJan Schmidt path = btrfs_alloc_path(); 3433d7728c96SJan Schmidt if (!path) { 3434d7728c96SJan Schmidt ret = -ENOMEM; 3435d7728c96SJan Schmidt goto out; 3436d7728c96SJan Schmidt } 3437d7728c96SJan Schmidt 3438425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3439d7728c96SJan Schmidt inodes = init_data_container(size); 3440d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3441d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3442d7728c96SJan Schmidt inodes = NULL; 3443d7728c96SJan Schmidt goto out; 3444d7728c96SJan Schmidt } 3445d7728c96SJan Schmidt 3446df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3447df031f07SLiu Bo build_ino_list, inodes); 3448df031f07SLiu Bo if (ret == -EINVAL) 3449d7728c96SJan Schmidt ret = -ENOENT; 3450d7728c96SJan Schmidt if (ret < 0) 3451d7728c96SJan Schmidt goto out; 3452d7728c96SJan Schmidt 3453745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3454745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3455d7728c96SJan Schmidt if (ret) 3456d7728c96SJan Schmidt ret = -EFAULT; 3457d7728c96SJan Schmidt 3458d7728c96SJan Schmidt out: 3459d7728c96SJan Schmidt btrfs_free_path(path); 3460425d17a2SLiu Bo vfree(inodes); 3461d7728c96SJan Schmidt kfree(loi); 3462d7728c96SJan Schmidt 3463d7728c96SJan Schmidt return ret; 3464d7728c96SJan Schmidt } 3465d7728c96SJan Schmidt 346619a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3467c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3468c9e9f97bSIlya Dryomov { 3469c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3470c9e9f97bSIlya Dryomov 3471c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3472c9e9f97bSIlya Dryomov 3473837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3474837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3475837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3476837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3477a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3478a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3479837d5b6eSIlya Dryomov 3480c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3481c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3482c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 348319a39dceSIlya Dryomov 348419a39dceSIlya Dryomov if (lock) { 348519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 348619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 348819a39dceSIlya Dryomov } else { 348919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 349019a39dceSIlya Dryomov } 3491c9e9f97bSIlya Dryomov } 3492c9e9f97bSIlya Dryomov 34939ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3494c9e9f97bSIlya Dryomov { 3495496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3496c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3497c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3498c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3499ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3500c9e9f97bSIlya Dryomov int ret; 3501c9e9f97bSIlya Dryomov 3502c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3503c9e9f97bSIlya Dryomov return -EPERM; 3504c9e9f97bSIlya Dryomov 3505e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35069ba1f6e4SLiu Bo if (ret) 35079ba1f6e4SLiu Bo return ret; 35089ba1f6e4SLiu Bo 3509ed0fb78fSIlya Dryomov again: 3510ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3511c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3512c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3513ed0fb78fSIlya Dryomov need_unlock = true; 3514ed0fb78fSIlya Dryomov goto locked; 3515ed0fb78fSIlya Dryomov } 3516ed0fb78fSIlya Dryomov 3517ed0fb78fSIlya Dryomov /* 3518ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3519ed0fb78fSIlya Dryomov * (1) some other op is running 3520ed0fb78fSIlya Dryomov * (2) balance is running 3521ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3522ed0fb78fSIlya Dryomov */ 3523ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3524ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3525ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3526ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3527ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3528ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3529ed0fb78fSIlya Dryomov goto again; 3530ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3531ed0fb78fSIlya Dryomov 3532ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3533ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3534ed0fb78fSIlya Dryomov /* this is (3) */ 3535ed0fb78fSIlya Dryomov need_unlock = false; 3536ed0fb78fSIlya Dryomov goto locked; 3537ed0fb78fSIlya Dryomov } 3538ed0fb78fSIlya Dryomov 3539ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3540ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3541ed0fb78fSIlya Dryomov goto again; 3542ed0fb78fSIlya Dryomov } else { 3543ed0fb78fSIlya Dryomov /* this is (2) */ 3544ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3545ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3546ed0fb78fSIlya Dryomov goto out; 3547ed0fb78fSIlya Dryomov } 3548ed0fb78fSIlya Dryomov } else { 3549ed0fb78fSIlya Dryomov /* this is (1) */ 3550ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3551ed0fb78fSIlya Dryomov pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 3552ed0fb78fSIlya Dryomov ret = -EINVAL; 3553ed0fb78fSIlya Dryomov goto out; 3554ed0fb78fSIlya Dryomov } 3555ed0fb78fSIlya Dryomov 3556ed0fb78fSIlya Dryomov locked: 3557ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3558c9e9f97bSIlya Dryomov 3559c9e9f97bSIlya Dryomov if (arg) { 3560c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3561c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3562c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3563ed0fb78fSIlya Dryomov goto out_unlock; 3564c9e9f97bSIlya Dryomov } 3565de322263SIlya Dryomov 3566de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3567de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3568de322263SIlya Dryomov ret = -ENOTCONN; 3569de322263SIlya Dryomov goto out_bargs; 3570de322263SIlya Dryomov } 3571de322263SIlya Dryomov 3572de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3573de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3574de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3575de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3576de322263SIlya Dryomov 3577de322263SIlya Dryomov goto do_balance; 3578de322263SIlya Dryomov } 3579c9e9f97bSIlya Dryomov } else { 3580c9e9f97bSIlya Dryomov bargs = NULL; 3581c9e9f97bSIlya Dryomov } 3582c9e9f97bSIlya Dryomov 3583ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3584837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3585837d5b6eSIlya Dryomov goto out_bargs; 3586837d5b6eSIlya Dryomov } 3587837d5b6eSIlya Dryomov 3588c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3589c9e9f97bSIlya Dryomov if (!bctl) { 3590c9e9f97bSIlya Dryomov ret = -ENOMEM; 3591c9e9f97bSIlya Dryomov goto out_bargs; 3592c9e9f97bSIlya Dryomov } 3593c9e9f97bSIlya Dryomov 3594c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3595c9e9f97bSIlya Dryomov if (arg) { 3596c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3597c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3598c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3599c9e9f97bSIlya Dryomov 3600c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3601f43ffb60SIlya Dryomov } else { 3602f43ffb60SIlya Dryomov /* balance everything - no filters */ 3603f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3604c9e9f97bSIlya Dryomov } 3605c9e9f97bSIlya Dryomov 3606de322263SIlya Dryomov do_balance: 3607c9e9f97bSIlya Dryomov /* 3608ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3609ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3610ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3611ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3612ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3613c9e9f97bSIlya Dryomov */ 3614ed0fb78fSIlya Dryomov need_unlock = false; 3615ed0fb78fSIlya Dryomov 3616ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3617ed0fb78fSIlya Dryomov 3618c9e9f97bSIlya Dryomov if (arg) { 3619c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3620c9e9f97bSIlya Dryomov ret = -EFAULT; 3621c9e9f97bSIlya Dryomov } 3622c9e9f97bSIlya Dryomov 3623c9e9f97bSIlya Dryomov out_bargs: 3624c9e9f97bSIlya Dryomov kfree(bargs); 3625ed0fb78fSIlya Dryomov out_unlock: 3626c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3627c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3628ed0fb78fSIlya Dryomov if (need_unlock) 3629ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3630ed0fb78fSIlya Dryomov out: 3631e54bfa31SLiu Bo mnt_drop_write_file(file); 3632c9e9f97bSIlya Dryomov return ret; 3633c9e9f97bSIlya Dryomov } 3634c9e9f97bSIlya Dryomov 3635837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3636837d5b6eSIlya Dryomov { 3637837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3638837d5b6eSIlya Dryomov return -EPERM; 3639837d5b6eSIlya Dryomov 3640837d5b6eSIlya Dryomov switch (cmd) { 3641837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3642837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3643a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3644a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3645837d5b6eSIlya Dryomov } 3646837d5b6eSIlya Dryomov 3647837d5b6eSIlya Dryomov return -EINVAL; 3648837d5b6eSIlya Dryomov } 3649837d5b6eSIlya Dryomov 365019a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 365119a39dceSIlya Dryomov void __user *arg) 365219a39dceSIlya Dryomov { 365319a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 365419a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 365519a39dceSIlya Dryomov int ret = 0; 365619a39dceSIlya Dryomov 365719a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 365819a39dceSIlya Dryomov return -EPERM; 365919a39dceSIlya Dryomov 366019a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 366119a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 366219a39dceSIlya Dryomov ret = -ENOTCONN; 366319a39dceSIlya Dryomov goto out; 366419a39dceSIlya Dryomov } 366519a39dceSIlya Dryomov 366619a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 366719a39dceSIlya Dryomov if (!bargs) { 366819a39dceSIlya Dryomov ret = -ENOMEM; 366919a39dceSIlya Dryomov goto out; 367019a39dceSIlya Dryomov } 367119a39dceSIlya Dryomov 367219a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 367319a39dceSIlya Dryomov 367419a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 367519a39dceSIlya Dryomov ret = -EFAULT; 367619a39dceSIlya Dryomov 367719a39dceSIlya Dryomov kfree(bargs); 367819a39dceSIlya Dryomov out: 367919a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 368019a39dceSIlya Dryomov return ret; 368119a39dceSIlya Dryomov } 368219a39dceSIlya Dryomov 3683905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36845d13a37bSArne Jansen { 3685496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 36865d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36875d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 36885d13a37bSArne Jansen int ret; 36895d13a37bSArne Jansen int err; 36905d13a37bSArne Jansen 36915d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36925d13a37bSArne Jansen return -EPERM; 36935d13a37bSArne Jansen 3694905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3695905b0ddaSMiao Xie if (ret) 3696905b0ddaSMiao Xie return ret; 36975d13a37bSArne Jansen 36985d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3699905b0ddaSMiao Xie if (IS_ERR(sa)) { 3700905b0ddaSMiao Xie ret = PTR_ERR(sa); 3701905b0ddaSMiao Xie goto drop_write; 3702905b0ddaSMiao Xie } 37035d13a37bSArne Jansen 37047708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 370592f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 37065d13a37bSArne Jansen if (IS_ERR(trans)) { 37075d13a37bSArne Jansen ret = PTR_ERR(trans); 37085d13a37bSArne Jansen goto out; 37095d13a37bSArne Jansen } 37105d13a37bSArne Jansen 37115d13a37bSArne Jansen switch (sa->cmd) { 37125d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 37135d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 37145d13a37bSArne Jansen break; 37155d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 37165d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 37175d13a37bSArne Jansen break; 37185d13a37bSArne Jansen default: 37195d13a37bSArne Jansen ret = -EINVAL; 37205d13a37bSArne Jansen break; 37215d13a37bSArne Jansen } 37225d13a37bSArne Jansen 372392f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 37245d13a37bSArne Jansen if (err && !ret) 37255d13a37bSArne Jansen ret = err; 37265d13a37bSArne Jansen out: 37275d13a37bSArne Jansen kfree(sa); 37287708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 3729905b0ddaSMiao Xie drop_write: 3730905b0ddaSMiao Xie mnt_drop_write_file(file); 37315d13a37bSArne Jansen return ret; 37325d13a37bSArne Jansen } 37335d13a37bSArne Jansen 3734905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37355d13a37bSArne Jansen { 3736496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 37375d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37385d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37395d13a37bSArne Jansen int ret; 37405d13a37bSArne Jansen int err; 37415d13a37bSArne Jansen 37425d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37435d13a37bSArne Jansen return -EPERM; 37445d13a37bSArne Jansen 3745905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3746905b0ddaSMiao Xie if (ret) 3747905b0ddaSMiao Xie return ret; 37485d13a37bSArne Jansen 37495d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3750905b0ddaSMiao Xie if (IS_ERR(sa)) { 3751905b0ddaSMiao Xie ret = PTR_ERR(sa); 3752905b0ddaSMiao Xie goto drop_write; 3753905b0ddaSMiao Xie } 37545d13a37bSArne Jansen 37555d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37565d13a37bSArne Jansen if (IS_ERR(trans)) { 37575d13a37bSArne Jansen ret = PTR_ERR(trans); 37585d13a37bSArne Jansen goto out; 37595d13a37bSArne Jansen } 37605d13a37bSArne Jansen 37615d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 37625d13a37bSArne Jansen if (sa->assign) { 37635d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 37645d13a37bSArne Jansen sa->src, sa->dst); 37655d13a37bSArne Jansen } else { 37665d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 37675d13a37bSArne Jansen sa->src, sa->dst); 37685d13a37bSArne Jansen } 37695d13a37bSArne Jansen 37705d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 37715d13a37bSArne Jansen if (err && !ret) 37725d13a37bSArne Jansen ret = err; 37735d13a37bSArne Jansen 37745d13a37bSArne Jansen out: 37755d13a37bSArne Jansen kfree(sa); 3776905b0ddaSMiao Xie drop_write: 3777905b0ddaSMiao Xie mnt_drop_write_file(file); 37785d13a37bSArne Jansen return ret; 37795d13a37bSArne Jansen } 37805d13a37bSArne Jansen 3781905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37825d13a37bSArne Jansen { 3783496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 37845d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37855d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37865d13a37bSArne Jansen int ret; 37875d13a37bSArne Jansen int err; 37885d13a37bSArne Jansen 37895d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37905d13a37bSArne Jansen return -EPERM; 37915d13a37bSArne Jansen 3792905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3793905b0ddaSMiao Xie if (ret) 3794905b0ddaSMiao Xie return ret; 37955d13a37bSArne Jansen 37965d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3797905b0ddaSMiao Xie if (IS_ERR(sa)) { 3798905b0ddaSMiao Xie ret = PTR_ERR(sa); 3799905b0ddaSMiao Xie goto drop_write; 3800905b0ddaSMiao Xie } 38015d13a37bSArne Jansen 3802d86e56cfSMiao Xie if (!sa->qgroupid) { 3803d86e56cfSMiao Xie ret = -EINVAL; 3804d86e56cfSMiao Xie goto out; 3805d86e56cfSMiao Xie } 3806d86e56cfSMiao Xie 38075d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38085d13a37bSArne Jansen if (IS_ERR(trans)) { 38095d13a37bSArne Jansen ret = PTR_ERR(trans); 38105d13a37bSArne Jansen goto out; 38115d13a37bSArne Jansen } 38125d13a37bSArne Jansen 38135d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38145d13a37bSArne Jansen if (sa->create) { 38155d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 38165d13a37bSArne Jansen NULL); 38175d13a37bSArne Jansen } else { 38185d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 38195d13a37bSArne Jansen } 38205d13a37bSArne Jansen 38215d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38225d13a37bSArne Jansen if (err && !ret) 38235d13a37bSArne Jansen ret = err; 38245d13a37bSArne Jansen 38255d13a37bSArne Jansen out: 38265d13a37bSArne Jansen kfree(sa); 3827905b0ddaSMiao Xie drop_write: 3828905b0ddaSMiao Xie mnt_drop_write_file(file); 38295d13a37bSArne Jansen return ret; 38305d13a37bSArne Jansen } 38315d13a37bSArne Jansen 3832905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38335d13a37bSArne Jansen { 3834496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 38355d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38365d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38375d13a37bSArne Jansen int ret; 38385d13a37bSArne Jansen int err; 38395d13a37bSArne Jansen u64 qgroupid; 38405d13a37bSArne Jansen 38415d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38425d13a37bSArne Jansen return -EPERM; 38435d13a37bSArne Jansen 3844905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3845905b0ddaSMiao Xie if (ret) 3846905b0ddaSMiao Xie return ret; 38475d13a37bSArne Jansen 38485d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3849905b0ddaSMiao Xie if (IS_ERR(sa)) { 3850905b0ddaSMiao Xie ret = PTR_ERR(sa); 3851905b0ddaSMiao Xie goto drop_write; 3852905b0ddaSMiao Xie } 38535d13a37bSArne Jansen 38545d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38555d13a37bSArne Jansen if (IS_ERR(trans)) { 38565d13a37bSArne Jansen ret = PTR_ERR(trans); 38575d13a37bSArne Jansen goto out; 38585d13a37bSArne Jansen } 38595d13a37bSArne Jansen 38605d13a37bSArne Jansen qgroupid = sa->qgroupid; 38615d13a37bSArne Jansen if (!qgroupid) { 38625d13a37bSArne Jansen /* take the current subvol as qgroup */ 38635d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38645d13a37bSArne Jansen } 38655d13a37bSArne Jansen 38665d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38675d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 38685d13a37bSArne Jansen 38695d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38705d13a37bSArne Jansen if (err && !ret) 38715d13a37bSArne Jansen ret = err; 38725d13a37bSArne Jansen 38735d13a37bSArne Jansen out: 38745d13a37bSArne Jansen kfree(sa); 3875905b0ddaSMiao Xie drop_write: 3876905b0ddaSMiao Xie mnt_drop_write_file(file); 38775d13a37bSArne Jansen return ret; 38785d13a37bSArne Jansen } 38795d13a37bSArne Jansen 38802f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38812f232036SJan Schmidt { 38822f232036SJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 38832f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38842f232036SJan Schmidt int ret; 38852f232036SJan Schmidt 38862f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38872f232036SJan Schmidt return -EPERM; 38882f232036SJan Schmidt 38892f232036SJan Schmidt ret = mnt_want_write_file(file); 38902f232036SJan Schmidt if (ret) 38912f232036SJan Schmidt return ret; 38922f232036SJan Schmidt 38932f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38942f232036SJan Schmidt if (IS_ERR(qsa)) { 38952f232036SJan Schmidt ret = PTR_ERR(qsa); 38962f232036SJan Schmidt goto drop_write; 38972f232036SJan Schmidt } 38982f232036SJan Schmidt 38992f232036SJan Schmidt if (qsa->flags) { 39002f232036SJan Schmidt ret = -EINVAL; 39012f232036SJan Schmidt goto out; 39022f232036SJan Schmidt } 39032f232036SJan Schmidt 39042f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 39052f232036SJan Schmidt 39062f232036SJan Schmidt out: 39072f232036SJan Schmidt kfree(qsa); 39082f232036SJan Schmidt drop_write: 39092f232036SJan Schmidt mnt_drop_write_file(file); 39102f232036SJan Schmidt return ret; 39112f232036SJan Schmidt } 39122f232036SJan Schmidt 39132f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 39142f232036SJan Schmidt { 39152f232036SJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 39162f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 39172f232036SJan Schmidt int ret = 0; 39182f232036SJan Schmidt 39192f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 39202f232036SJan Schmidt return -EPERM; 39212f232036SJan Schmidt 39222f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 39232f232036SJan Schmidt if (!qsa) 39242f232036SJan Schmidt return -ENOMEM; 39252f232036SJan Schmidt 39262f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 39272f232036SJan Schmidt qsa->flags = 1; 39282f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 39292f232036SJan Schmidt } 39302f232036SJan Schmidt 39312f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 39322f232036SJan Schmidt ret = -EFAULT; 39332f232036SJan Schmidt 39342f232036SJan Schmidt kfree(qsa); 39352f232036SJan Schmidt return ret; 39362f232036SJan Schmidt } 39372f232036SJan Schmidt 393857254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 393957254b6eSJan Schmidt { 394057254b6eSJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 394157254b6eSJan Schmidt 394257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 394357254b6eSJan Schmidt return -EPERM; 394457254b6eSJan Schmidt 394557254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 394657254b6eSJan Schmidt } 394757254b6eSJan Schmidt 39488ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 39498ea05e3aSAlexander Block void __user *arg) 39508ea05e3aSAlexander Block { 39518ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 3952496ad9aaSAl Viro struct inode *inode = file_inode(file); 39538ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39548ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39558ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 39568ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 39578ea05e3aSAlexander Block int ret = 0; 39588ea05e3aSAlexander Block 39598ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39608ea05e3aSAlexander Block if (ret < 0) 39618ea05e3aSAlexander Block return ret; 39628ea05e3aSAlexander Block 39638ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 39648ea05e3aSAlexander Block 39658ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 39668ea05e3aSAlexander Block ret = -EINVAL; 39678ea05e3aSAlexander Block goto out; 39688ea05e3aSAlexander Block } 39698ea05e3aSAlexander Block 39708ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39718ea05e3aSAlexander Block ret = -EROFS; 39728ea05e3aSAlexander Block goto out; 39738ea05e3aSAlexander Block } 39748ea05e3aSAlexander Block 39758ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 39768ea05e3aSAlexander Block ret = -EACCES; 39778ea05e3aSAlexander Block goto out; 39788ea05e3aSAlexander Block } 39798ea05e3aSAlexander Block 39808ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 39818ea05e3aSAlexander Block if (IS_ERR(sa)) { 39828ea05e3aSAlexander Block ret = PTR_ERR(sa); 39838ea05e3aSAlexander Block sa = NULL; 39848ea05e3aSAlexander Block goto out; 39858ea05e3aSAlexander Block } 39868ea05e3aSAlexander Block 39878ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 39888ea05e3aSAlexander Block if (IS_ERR(trans)) { 39898ea05e3aSAlexander Block ret = PTR_ERR(trans); 39908ea05e3aSAlexander Block trans = NULL; 39918ea05e3aSAlexander Block goto out; 39928ea05e3aSAlexander Block } 39938ea05e3aSAlexander Block 39948ea05e3aSAlexander Block sa->rtransid = trans->transid; 39958ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39968ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39978ea05e3aSAlexander Block 39988ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39998ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 40008ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 40018ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 40028ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 40038ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 40048ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 40058ea05e3aSAlexander Block 40068ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 40078ea05e3aSAlexander Block &root->root_key, &root->root_item); 40088ea05e3aSAlexander Block if (ret < 0) { 40098ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 40108ea05e3aSAlexander Block trans = NULL; 40118ea05e3aSAlexander Block goto out; 40128ea05e3aSAlexander Block } else { 40138ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 40148ea05e3aSAlexander Block if (ret < 0) 40158ea05e3aSAlexander Block goto out; 40168ea05e3aSAlexander Block } 40178ea05e3aSAlexander Block 40188ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40198ea05e3aSAlexander Block if (ret) 40208ea05e3aSAlexander Block ret = -EFAULT; 40218ea05e3aSAlexander Block 40228ea05e3aSAlexander Block out: 40238ea05e3aSAlexander Block kfree(sa); 40248ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 40258ea05e3aSAlexander Block mnt_drop_write_file(file); 40268ea05e3aSAlexander Block return ret; 40278ea05e3aSAlexander Block } 40288ea05e3aSAlexander Block 4029867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4030867ab667Sjeff.liu { 4031867ab667Sjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 4032867ab667Sjeff.liu const char *label = root->fs_info->super_copy->label; 4033867ab667Sjeff.liu size_t len = strnlen(label, BTRFS_LABEL_SIZE); 4034867ab667Sjeff.liu int ret; 4035867ab667Sjeff.liu 4036867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4037867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4038867ab667Sjeff.liu --len); 4039867ab667Sjeff.liu } 4040867ab667Sjeff.liu 4041867ab667Sjeff.liu mutex_lock(&root->fs_info->volume_mutex); 4042867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4043867ab667Sjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 4044867ab667Sjeff.liu 4045867ab667Sjeff.liu return ret ? -EFAULT : 0; 4046867ab667Sjeff.liu } 4047867ab667Sjeff.liu 4048a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4049a8bfd4abSjeff.liu { 4050a8bfd4abSjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 4051a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4052a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4053a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4054a8bfd4abSjeff.liu int ret; 4055a8bfd4abSjeff.liu 4056a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4057a8bfd4abSjeff.liu return -EPERM; 4058a8bfd4abSjeff.liu 4059a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4060a8bfd4abSjeff.liu return -EFAULT; 4061a8bfd4abSjeff.liu 4062a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4063a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4064a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4065a8bfd4abSjeff.liu return -EINVAL; 4066a8bfd4abSjeff.liu } 4067a8bfd4abSjeff.liu 4068a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4069a8bfd4abSjeff.liu if (ret) 4070a8bfd4abSjeff.liu return ret; 4071a8bfd4abSjeff.liu 4072a8bfd4abSjeff.liu mutex_lock(&root->fs_info->volume_mutex); 4073a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4074a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4075a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4076a8bfd4abSjeff.liu goto out_unlock; 4077a8bfd4abSjeff.liu } 4078a8bfd4abSjeff.liu 4079a8bfd4abSjeff.liu strcpy(super_block->label, label); 4080a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4081a8bfd4abSjeff.liu 4082a8bfd4abSjeff.liu out_unlock: 4083a8bfd4abSjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 4084a8bfd4abSjeff.liu mnt_drop_write_file(file); 4085a8bfd4abSjeff.liu return ret; 4086a8bfd4abSjeff.liu } 4087a8bfd4abSjeff.liu 4088f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4089f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4090f46b5a66SChristoph Hellwig { 4091496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40924bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4093f46b5a66SChristoph Hellwig 4094f46b5a66SChristoph Hellwig switch (cmd) { 40956cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 40966cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 40976cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 40986cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 40996cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 41006cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4101f7039b1dSLi Dongyang case FITRIM: 4102f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4103f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4104fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4105fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4106fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 41073de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4108fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 41096f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 41106f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 411176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 411276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 41130caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 41140caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 41150caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 41160caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 41176ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 41186ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4119f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 41201e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 41211e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 41221e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4123f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4124198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4125f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 41264bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4127f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4128da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4129475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4130475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4131475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4132475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4133f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 41349ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4135f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4136c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4137c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 41387a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4139f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4140f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4141f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4142f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4143ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4144ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4145ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4146ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4147d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4148d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4149d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4150d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 41511406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 41521406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 4153f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 4154f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 4155f46b5a66SChristoph Hellwig return 0; 415646204592SSage Weil case BTRFS_IOC_START_SYNC: 41579a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 415846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 41599a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4160475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4161b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4162475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4163475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4164475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4165475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4166c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 41679ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4168837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4169837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 417019a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 417119a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 41728ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 41738ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 417431db9f7cSAlexander Block case BTRFS_IOC_SEND: 417531db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4176c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4177b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 41785d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4179905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 41805d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4181905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 41825d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4183905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 41845d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4185905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 41862f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 41872f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 41882f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 41892f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 419057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 419157254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 41923f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 41933f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4194867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4195867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4196a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4197a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4198f46b5a66SChristoph Hellwig } 4199f46b5a66SChristoph Hellwig 4200f46b5a66SChristoph Hellwig return -ENOTTY; 4201f46b5a66SChristoph Hellwig } 4202