1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 474b4e25f2SChris Mason #include "compat.h" 48f46b5a66SChristoph Hellwig #include "ctree.h" 49f46b5a66SChristoph Hellwig #include "disk-io.h" 50f46b5a66SChristoph Hellwig #include "transaction.h" 51f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 52f46b5a66SChristoph Hellwig #include "print-tree.h" 53f46b5a66SChristoph Hellwig #include "volumes.h" 54925baeddSChris Mason #include "locking.h" 55581bb050SLi Zefan #include "inode-map.h" 56d7728c96SJan Schmidt #include "backref.h" 57606686eeSJosef Bacik #include "rcu-string.h" 5831db9f7cSAlexander Block #include "send.h" 593f6bcfbdSStefan Behrens #include "dev-replace.h" 60f46b5a66SChristoph Hellwig 61416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 62416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 63416161dbSMark Fasheh 646cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 656cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 666cbff00fSChristoph Hellwig { 676cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 686cbff00fSChristoph Hellwig return flags; 696cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 706cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 716cbff00fSChristoph Hellwig else 726cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 736cbff00fSChristoph Hellwig } 74f46b5a66SChristoph Hellwig 756cbff00fSChristoph Hellwig /* 766cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 776cbff00fSChristoph Hellwig */ 786cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 796cbff00fSChristoph Hellwig { 806cbff00fSChristoph Hellwig unsigned int iflags = 0; 816cbff00fSChristoph Hellwig 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 836cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 856cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 866cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 876cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 886cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 896cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 906cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 916cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 926cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 936cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 94d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 95d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 96d0092bddSLi Zefan 97d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 98d0092bddSLi Zefan iflags |= FS_COMPR_FL; 99d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 100d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1016cbff00fSChristoph Hellwig 1026cbff00fSChristoph Hellwig return iflags; 1036cbff00fSChristoph Hellwig } 1046cbff00fSChristoph Hellwig 1056cbff00fSChristoph Hellwig /* 1066cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1076cbff00fSChristoph Hellwig */ 1086cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1096cbff00fSChristoph Hellwig { 1106cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1116cbff00fSChristoph Hellwig 1126cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1136cbff00fSChristoph Hellwig 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1166cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1176cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1186cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1196cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1206cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1216cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1226cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1236cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1246cbff00fSChristoph Hellwig } 1256cbff00fSChristoph Hellwig 1266cbff00fSChristoph Hellwig /* 1276cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1286cbff00fSChristoph Hellwig * 129e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1306cbff00fSChristoph Hellwig */ 1316cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1326cbff00fSChristoph Hellwig { 1330b4dcea5SChris Mason unsigned int flags; 1340b4dcea5SChris Mason 1350b4dcea5SChris Mason if (!dir) 1360b4dcea5SChris Mason return; 1370b4dcea5SChris Mason 1380b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1396cbff00fSChristoph Hellwig 140e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 141e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 142e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 143e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 144e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 145e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 146e27425d6SJosef Bacik } 1476cbff00fSChristoph Hellwig 148213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 149e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 150213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 151213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 152213490b3SLiu Bo } 153e27425d6SJosef Bacik 1546cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 159496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1606cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 16775e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16875e7cb7fSLiu Bo { 16975e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17075e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17175e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 172e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 173e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17475e7cb7fSLiu Bo return -EOPNOTSUPP; 17575e7cb7fSLiu Bo 17675e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17775e7cb7fSLiu Bo return -EINVAL; 17875e7cb7fSLiu Bo 17975e7cb7fSLiu Bo return 0; 18075e7cb7fSLiu Bo } 18175e7cb7fSLiu Bo 1826cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1836cbff00fSChristoph Hellwig { 184496ad9aaSAl Viro struct inode *inode = file_inode(file); 1856cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1866cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1876cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1886cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1896cbff00fSChristoph Hellwig int ret; 190f062abf0SLi Zefan u64 ip_oldflags; 191f062abf0SLi Zefan unsigned int i_oldflags; 1927e97b8daSDavid Sterba umode_t mode; 1936cbff00fSChristoph Hellwig 194b83cc969SLi Zefan if (btrfs_root_readonly(root)) 195b83cc969SLi Zefan return -EROFS; 196b83cc969SLi Zefan 1976cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1986cbff00fSChristoph Hellwig return -EFAULT; 1996cbff00fSChristoph Hellwig 20075e7cb7fSLiu Bo ret = check_flags(flags); 20175e7cb7fSLiu Bo if (ret) 20275e7cb7fSLiu Bo return ret; 2036cbff00fSChristoph Hellwig 2042e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2056cbff00fSChristoph Hellwig return -EACCES; 2066cbff00fSChristoph Hellwig 207e7848683SJan Kara ret = mnt_want_write_file(file); 208e7848683SJan Kara if (ret) 209e7848683SJan Kara return ret; 210e7848683SJan Kara 2116cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2126cbff00fSChristoph Hellwig 213f062abf0SLi Zefan ip_oldflags = ip->flags; 214f062abf0SLi Zefan i_oldflags = inode->i_flags; 2157e97b8daSDavid Sterba mode = inode->i_mode; 216f062abf0SLi Zefan 2176cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2186cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2196cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2206cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2216cbff00fSChristoph Hellwig ret = -EPERM; 2226cbff00fSChristoph Hellwig goto out_unlock; 2236cbff00fSChristoph Hellwig } 2246cbff00fSChristoph Hellwig } 2256cbff00fSChristoph Hellwig 2266cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2306cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2346cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2386cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2396cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2406cbff00fSChristoph Hellwig else 2416cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2426cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2436cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2446cbff00fSChristoph Hellwig else 2456cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2466cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2476cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2486cbff00fSChristoph Hellwig else 2496cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2507e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2517e97b8daSDavid Sterba if (S_ISREG(mode)) { 2527e97b8daSDavid Sterba /* 2537e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2547e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2557e97b8daSDavid Sterba * status of the file and will not set it. 2567e97b8daSDavid Sterba */ 2577e97b8daSDavid Sterba if (inode->i_size == 0) 2587e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2597e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2607e97b8daSDavid Sterba } else { 261e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2627e97b8daSDavid Sterba } 2637e97b8daSDavid Sterba } else { 2647e97b8daSDavid Sterba /* 2657e97b8daSDavid Sterba * Revert back under same assuptions as above 2667e97b8daSDavid Sterba */ 2677e97b8daSDavid Sterba if (S_ISREG(mode)) { 2687e97b8daSDavid Sterba if (inode->i_size == 0) 2697e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2707e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2717e97b8daSDavid Sterba } else { 272e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2737e97b8daSDavid Sterba } 2747e97b8daSDavid Sterba } 2756cbff00fSChristoph Hellwig 27675e7cb7fSLiu Bo /* 27775e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27875e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27975e7cb7fSLiu Bo * things smaller. 28075e7cb7fSLiu Bo */ 28175e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 28275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 28375e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28475e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 28575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 28675e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 287ebcb904dSLi Zefan } else { 288ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28975e7cb7fSLiu Bo } 2906cbff00fSChristoph Hellwig 2914da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 292f062abf0SLi Zefan if (IS_ERR(trans)) { 293f062abf0SLi Zefan ret = PTR_ERR(trans); 294f062abf0SLi Zefan goto out_drop; 295f062abf0SLi Zefan } 2966cbff00fSChristoph Hellwig 297306424ccSLi Zefan btrfs_update_iflags(inode); 2980c4d2d95SJosef Bacik inode_inc_iversion(inode); 299306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3006cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3016cbff00fSChristoph Hellwig 3026cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 303f062abf0SLi Zefan out_drop: 304f062abf0SLi Zefan if (ret) { 305f062abf0SLi Zefan ip->flags = ip_oldflags; 306f062abf0SLi Zefan inode->i_flags = i_oldflags; 307f062abf0SLi Zefan } 3086cbff00fSChristoph Hellwig 3096cbff00fSChristoph Hellwig out_unlock: 3106cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 311e7848683SJan Kara mnt_drop_write_file(file); 3122d4e6f6aSliubo return ret; 3136cbff00fSChristoph Hellwig } 3146cbff00fSChristoph Hellwig 3156cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3166cbff00fSChristoph Hellwig { 317496ad9aaSAl Viro struct inode *inode = file_inode(file); 3186cbff00fSChristoph Hellwig 3196cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3206cbff00fSChristoph Hellwig } 321f46b5a66SChristoph Hellwig 322f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 323f7039b1dSLi Dongyang { 324815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 325f7039b1dSLi Dongyang struct btrfs_device *device; 326f7039b1dSLi Dongyang struct request_queue *q; 327f7039b1dSLi Dongyang struct fstrim_range range; 328f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 329f7039b1dSLi Dongyang u64 num_devices = 0; 330815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 331f7039b1dSLi Dongyang int ret; 332f7039b1dSLi Dongyang 333f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 334f7039b1dSLi Dongyang return -EPERM; 335f7039b1dSLi Dongyang 3361f78160cSXiao Guangrong rcu_read_lock(); 3371f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3381f78160cSXiao Guangrong dev_list) { 339f7039b1dSLi Dongyang if (!device->bdev) 340f7039b1dSLi Dongyang continue; 341f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 342f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 343f7039b1dSLi Dongyang num_devices++; 344f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 345f7039b1dSLi Dongyang minlen); 346f7039b1dSLi Dongyang } 347f7039b1dSLi Dongyang } 3481f78160cSXiao Guangrong rcu_read_unlock(); 349f4c697e6SLukas Czerner 350f7039b1dSLi Dongyang if (!num_devices) 351f7039b1dSLi Dongyang return -EOPNOTSUPP; 352f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 353f7039b1dSLi Dongyang return -EFAULT; 354e515c18bSLukas Czerner if (range.start > total_bytes || 355e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 356f4c697e6SLukas Czerner return -EINVAL; 357f7039b1dSLi Dongyang 358f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 359f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 360815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 361f7039b1dSLi Dongyang if (ret < 0) 362f7039b1dSLi Dongyang return ret; 363f7039b1dSLi Dongyang 364f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 365f7039b1dSLi Dongyang return -EFAULT; 366f7039b1dSLi Dongyang 367f7039b1dSLi Dongyang return 0; 368f7039b1dSLi Dongyang } 369f7039b1dSLi Dongyang 370dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 371dd5f9615SStefan Behrens { 372dd5f9615SStefan Behrens static char empty_uuid[BTRFS_UUID_SIZE] = {0}; 373dd5f9615SStefan Behrens 374dd5f9615SStefan Behrens return !memcmp(uuid, empty_uuid, BTRFS_UUID_SIZE); 375dd5f9615SStefan Behrens } 376dd5f9615SStefan Behrens 377d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 378cb8e7090SChristoph Hellwig struct dentry *dentry, 37972fd032eSSage Weil char *name, int namelen, 3806f72c7e2SArne Jansen u64 *async_transid, 3818696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 382f46b5a66SChristoph Hellwig { 383f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 384f46b5a66SChristoph Hellwig struct btrfs_key key; 385f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 386f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 387f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 388d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 38976dda93cSYan, Zheng struct btrfs_root *new_root; 390d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3918ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 392f46b5a66SChristoph Hellwig int ret; 393f46b5a66SChristoph Hellwig int err; 394f46b5a66SChristoph Hellwig u64 objectid; 395f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3963de4586cSChris Mason u64 index = 0; 397d5c12070SMiao Xie u64 qgroup_reserved; 3988ea05e3aSAlexander Block uuid_le new_uuid; 399f46b5a66SChristoph Hellwig 400581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4012fbe8c8aSAl Viro if (ret) 402a22285a6SYan, Zheng return ret; 4036a912213SJosef Bacik 404d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4059ed74f2dSJosef Bacik /* 406d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 407d5c12070SMiao Xie * of create_snapshot(). 4089ed74f2dSJosef Bacik */ 409d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 410dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 411d5c12070SMiao Xie if (ret) 412d5c12070SMiao Xie return ret; 413f46b5a66SChristoph Hellwig 414d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 415d5c12070SMiao Xie if (IS_ERR(trans)) { 416d5c12070SMiao Xie ret = PTR_ERR(trans); 417d5c12070SMiao Xie goto out; 418d5c12070SMiao Xie } 419d5c12070SMiao Xie trans->block_rsv = &block_rsv; 420d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 421f46b5a66SChristoph Hellwig 4228696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4236f72c7e2SArne Jansen if (ret) 4246f72c7e2SArne Jansen goto fail; 4256f72c7e2SArne Jansen 4265d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4275581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4288e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4298e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4308e8a1e31SJosef Bacik goto fail; 4318e8a1e31SJosef Bacik } 432f46b5a66SChristoph Hellwig 4335d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 434f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 435f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4365d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 437f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 438f46b5a66SChristoph Hellwig 439f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 440f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 441f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4425d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 4435d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 4445d4f98a2SYan Zheng BTRFS_UUID_SIZE); 445f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 446f46b5a66SChristoph Hellwig 4478ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4488ea05e3aSAlexander Block 449f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4503cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 4513cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 4523cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 4533cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 4543cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 455f46b5a66SChristoph Hellwig 4563cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 4573cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 4583cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 45908fe4db1SLi Zefan 460f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 46184234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 462f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 463f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 46486b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 46580ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 466f46b5a66SChristoph Hellwig 4678ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4688ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4698ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4708ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4713cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 4723cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 4738ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4748ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4758ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 476f46b5a66SChristoph Hellwig 477925baeddSChris Mason btrfs_tree_unlock(leaf); 478f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 479f46b5a66SChristoph Hellwig leaf = NULL; 480f46b5a66SChristoph Hellwig 481f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 482f46b5a66SChristoph Hellwig 483f46b5a66SChristoph Hellwig key.objectid = objectid; 4845d4f98a2SYan Zheng key.offset = 0; 485f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 486f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 487f46b5a66SChristoph Hellwig &root_item); 488f46b5a66SChristoph Hellwig if (ret) 489f46b5a66SChristoph Hellwig goto fail; 490f46b5a66SChristoph Hellwig 49176dda93cSYan, Zheng key.offset = (u64)-1; 49276dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 49379787eaaSJeff Mahoney if (IS_ERR(new_root)) { 49479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 49579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 49679787eaaSJeff Mahoney goto fail; 49779787eaaSJeff Mahoney } 49876dda93cSYan, Zheng 49976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 50076dda93cSYan, Zheng 501d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 502ce598979SMark Fasheh if (ret) { 503ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 50479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 505ce598979SMark Fasheh goto fail; 506ce598979SMark Fasheh } 507ce598979SMark Fasheh 508f46b5a66SChristoph Hellwig /* 509f46b5a66SChristoph Hellwig * insert the directory item 510f46b5a66SChristoph Hellwig */ 5113de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 51279787eaaSJeff Mahoney if (ret) { 51379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 51479787eaaSJeff Mahoney goto fail; 51579787eaaSJeff Mahoney } 5163de4586cSChris Mason 5173de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 51816cdcec7SMiao Xie name, namelen, dir, &key, 5193de4586cSChris Mason BTRFS_FT_DIR, index); 52079787eaaSJeff Mahoney if (ret) { 52179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 522f46b5a66SChristoph Hellwig goto fail; 52379787eaaSJeff Mahoney } 5240660b5afSChris Mason 52552c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 52652c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 52752c26179SYan Zheng BUG_ON(ret); 52852c26179SYan Zheng 5290660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5304df27c4dSYan, Zheng objectid, root->root_key.objectid, 53133345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5320660b5afSChris Mason BUG_ON(ret); 5330660b5afSChris Mason 534dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 535dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 536dd5f9615SStefan Behrens objectid); 537dd5f9615SStefan Behrens if (ret) 538dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 539dd5f9615SStefan Behrens 540f46b5a66SChristoph Hellwig fail: 541d5c12070SMiao Xie trans->block_rsv = NULL; 542d5c12070SMiao Xie trans->bytes_reserved = 0; 54372fd032eSSage Weil if (async_transid) { 54472fd032eSSage Weil *async_transid = trans->transid; 54572fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 54600d71c9cSMiao Xie if (err) 54700d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 54872fd032eSSage Weil } else { 54976dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 55072fd032eSSage Weil } 551f46b5a66SChristoph Hellwig if (err && !ret) 552f46b5a66SChristoph Hellwig ret = err; 5531a65e24bSChris Mason 5541a65e24bSChris Mason if (!ret) 5551a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 556d5c12070SMiao Xie out: 557d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 558f46b5a66SChristoph Hellwig return ret; 559f46b5a66SChristoph Hellwig } 560f46b5a66SChristoph Hellwig 561e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 562e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 563e9662f70SMiao Xie u64 *async_transid, bool readonly, 564e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 565f46b5a66SChristoph Hellwig { 5662e4bfab9SYan, Zheng struct inode *inode; 567f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 568f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5692e4bfab9SYan, Zheng int ret; 570f46b5a66SChristoph Hellwig 571f46b5a66SChristoph Hellwig if (!root->ref_cows) 572f46b5a66SChristoph Hellwig return -EINVAL; 573f46b5a66SChristoph Hellwig 5746a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 5756a03843dSMiao Xie if (ret) 5766a03843dSMiao Xie return ret; 5776a03843dSMiao Xie 5786a03843dSMiao Xie btrfs_wait_ordered_extents(root, 0); 5796a03843dSMiao Xie 580a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 581a22285a6SYan, Zheng if (!pending_snapshot) 582a22285a6SYan, Zheng return -ENOMEM; 583a22285a6SYan, Zheng 58466d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 58566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 586d5c12070SMiao Xie /* 587d5c12070SMiao Xie * 1 - parent dir inode 588d5c12070SMiao Xie * 2 - dir entries 589d5c12070SMiao Xie * 1 - root item 590d5c12070SMiao Xie * 2 - root ref/backref 591d5c12070SMiao Xie * 1 - root of snapshot 592dd5f9615SStefan Behrens * 1 - UUID item 593d5c12070SMiao Xie */ 594d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 595dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 596ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 597ee3441b4SJeff Mahoney false); 598d5c12070SMiao Xie if (ret) 599d5c12070SMiao Xie goto out; 600d5c12070SMiao Xie 601a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 602a22285a6SYan, Zheng pending_snapshot->root = root; 603b83cc969SLi Zefan pending_snapshot->readonly = readonly; 604e9662f70SMiao Xie pending_snapshot->dir = dir; 6058696c533SMiao Xie pending_snapshot->inherit = inherit; 606a22285a6SYan, Zheng 607d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 608a22285a6SYan, Zheng if (IS_ERR(trans)) { 609a22285a6SYan, Zheng ret = PTR_ERR(trans); 610a22285a6SYan, Zheng goto fail; 611a22285a6SYan, Zheng } 612a22285a6SYan, Zheng 6138351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 614a22285a6SYan, Zheng list_add(&pending_snapshot->list, 615a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6168351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 61772fd032eSSage Weil if (async_transid) { 61872fd032eSSage Weil *async_transid = trans->transid; 61972fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 62072fd032eSSage Weil root->fs_info->extent_root, 1); 62100d71c9cSMiao Xie if (ret) 62200d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 62372fd032eSSage Weil } else { 62472fd032eSSage Weil ret = btrfs_commit_transaction(trans, 62572fd032eSSage Weil root->fs_info->extent_root); 62672fd032eSSage Weil } 627aec8030aSMiao Xie if (ret) 628c37b2b62SJosef Bacik goto fail; 629a22285a6SYan, Zheng 630a22285a6SYan, Zheng ret = pending_snapshot->error; 631f46b5a66SChristoph Hellwig if (ret) 6322e4bfab9SYan, Zheng goto fail; 633f46b5a66SChristoph Hellwig 63466b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 63566b4ffd1SJosef Bacik if (ret) 63666b4ffd1SJosef Bacik goto fail; 637f46b5a66SChristoph Hellwig 6382fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6392e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6402e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6412e4bfab9SYan, Zheng goto fail; 6422e4bfab9SYan, Zheng } 6432e4bfab9SYan, Zheng BUG_ON(!inode); 6442e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6452e4bfab9SYan, Zheng ret = 0; 6462e4bfab9SYan, Zheng fail: 647d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 648d5c12070SMiao Xie &pending_snapshot->block_rsv, 649d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 650d5c12070SMiao Xie out: 651a22285a6SYan, Zheng kfree(pending_snapshot); 652f46b5a66SChristoph Hellwig return ret; 653f46b5a66SChristoph Hellwig } 654f46b5a66SChristoph Hellwig 6554260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6564260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6574260f7c7SSage Weil * minimal. 6584260f7c7SSage Weil */ 6594260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6604260f7c7SSage Weil { 6612f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6624260f7c7SSage Weil 6634260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6644260f7c7SSage Weil return 0; 6652f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6664260f7c7SSage Weil return 0; 6672f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6684260f7c7SSage Weil return 0; 6694260f7c7SSage Weil return !capable(CAP_FOWNER); 6704260f7c7SSage Weil } 6714260f7c7SSage Weil 6724260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6734260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6744260f7c7SSage Weil * whether the type of victim is right. 6754260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6764260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6774260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6784260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6794260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6804260f7c7SSage Weil * a. be owner of dir, or 6814260f7c7SSage Weil * b. be owner of victim, or 6824260f7c7SSage Weil * c. have CAP_FOWNER capability 6834260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6844260f7c7SSage Weil * links pointing to it. 6854260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6864260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6874260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6884260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6894260f7c7SSage Weil * nfs_async_unlink(). 6904260f7c7SSage Weil */ 6914260f7c7SSage Weil 6924260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6934260f7c7SSage Weil { 6944260f7c7SSage Weil int error; 6954260f7c7SSage Weil 6964260f7c7SSage Weil if (!victim->d_inode) 6974260f7c7SSage Weil return -ENOENT; 6984260f7c7SSage Weil 6994260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7004fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7014260f7c7SSage Weil 7024260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7034260f7c7SSage Weil if (error) 7044260f7c7SSage Weil return error; 7054260f7c7SSage Weil if (IS_APPEND(dir)) 7064260f7c7SSage Weil return -EPERM; 7074260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7084260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7094260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7104260f7c7SSage Weil return -EPERM; 7114260f7c7SSage Weil if (isdir) { 7124260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7134260f7c7SSage Weil return -ENOTDIR; 7144260f7c7SSage Weil if (IS_ROOT(victim)) 7154260f7c7SSage Weil return -EBUSY; 7164260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7174260f7c7SSage Weil return -EISDIR; 7184260f7c7SSage Weil if (IS_DEADDIR(dir)) 7194260f7c7SSage Weil return -ENOENT; 7204260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7214260f7c7SSage Weil return -EBUSY; 7224260f7c7SSage Weil return 0; 7234260f7c7SSage Weil } 7244260f7c7SSage Weil 725cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 726cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 727cb8e7090SChristoph Hellwig { 728cb8e7090SChristoph Hellwig if (child->d_inode) 729cb8e7090SChristoph Hellwig return -EEXIST; 730cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 731cb8e7090SChristoph Hellwig return -ENOENT; 732cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 733cb8e7090SChristoph Hellwig } 734cb8e7090SChristoph Hellwig 735cb8e7090SChristoph Hellwig /* 736cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 737cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 738cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 739cb8e7090SChristoph Hellwig */ 74076dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 74176dda93cSYan, Zheng char *name, int namelen, 74272fd032eSSage Weil struct btrfs_root *snap_src, 7436f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7448696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 745cb8e7090SChristoph Hellwig { 74676dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 747cb8e7090SChristoph Hellwig struct dentry *dentry; 748cb8e7090SChristoph Hellwig int error; 749cb8e7090SChristoph Hellwig 7505c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7515c50c9b8SDavid Sterba if (error == -EINTR) 7525c50c9b8SDavid Sterba return error; 753cb8e7090SChristoph Hellwig 754cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 755cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 756cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 757cb8e7090SChristoph Hellwig goto out_unlock; 758cb8e7090SChristoph Hellwig 759cb8e7090SChristoph Hellwig error = -EEXIST; 760cb8e7090SChristoph Hellwig if (dentry->d_inode) 761cb8e7090SChristoph Hellwig goto out_dput; 762cb8e7090SChristoph Hellwig 76376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 764cb8e7090SChristoph Hellwig if (error) 765a874a63eSLiu Bo goto out_dput; 766cb8e7090SChristoph Hellwig 7679c52057cSChris Mason /* 7689c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7699c52057cSChris Mason * check for them now when we can safely fail 7709c52057cSChris Mason */ 7719c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7729c52057cSChris Mason dir->i_ino, name, 7739c52057cSChris Mason namelen); 7749c52057cSChris Mason if (error) 7759c52057cSChris Mason goto out_dput; 7769c52057cSChris Mason 77776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 77876dda93cSYan, Zheng 77976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 78076dda93cSYan, Zheng goto out_up_read; 78176dda93cSYan, Zheng 7823de4586cSChris Mason if (snap_src) { 783e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7846f72c7e2SArne Jansen async_transid, readonly, inherit); 7853de4586cSChris Mason } else { 786d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 787d5c12070SMiao Xie async_transid, inherit); 7883de4586cSChris Mason } 78976dda93cSYan, Zheng if (!error) 79076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 79176dda93cSYan, Zheng out_up_read: 79276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 793cb8e7090SChristoph Hellwig out_dput: 794cb8e7090SChristoph Hellwig dput(dentry); 795cb8e7090SChristoph Hellwig out_unlock: 79676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 797cb8e7090SChristoph Hellwig return error; 798cb8e7090SChristoph Hellwig } 799cb8e7090SChristoph Hellwig 8004cb5300bSChris Mason /* 8014cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8024cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8034cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8044cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8054cb5300bSChris Mason * part of the file 8064cb5300bSChris Mason */ 8074cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8084cb5300bSChris Mason { 8094cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8104cb5300bSChris Mason struct extent_map *em = NULL; 8114cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8124cb5300bSChris Mason u64 end; 8134cb5300bSChris Mason 8144cb5300bSChris Mason read_lock(&em_tree->lock); 8154cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8164cb5300bSChris Mason read_unlock(&em_tree->lock); 8174cb5300bSChris Mason 8184cb5300bSChris Mason if (em) { 8194cb5300bSChris Mason end = extent_map_end(em); 8204cb5300bSChris Mason free_extent_map(em); 8214cb5300bSChris Mason if (end - offset > thresh) 8224cb5300bSChris Mason return 0; 8234cb5300bSChris Mason } 8244cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8254cb5300bSChris Mason thresh /= 2; 8264cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8274cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8284cb5300bSChris Mason if (end >= thresh) 8294cb5300bSChris Mason return 0; 8304cb5300bSChris Mason return 1; 8314cb5300bSChris Mason } 8324cb5300bSChris Mason 8334cb5300bSChris Mason /* 8344cb5300bSChris Mason * helper function to walk through a file and find extents 8354cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8364cb5300bSChris Mason * 8374cb5300bSChris Mason * This is used by the defragging code to find new and small 8384cb5300bSChris Mason * extents 8394cb5300bSChris Mason */ 8404cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8414cb5300bSChris Mason struct inode *inode, u64 newer_than, 8424cb5300bSChris Mason u64 *off, int thresh) 8434cb5300bSChris Mason { 8444cb5300bSChris Mason struct btrfs_path *path; 8454cb5300bSChris Mason struct btrfs_key min_key; 8464cb5300bSChris Mason struct btrfs_key max_key; 8474cb5300bSChris Mason struct extent_buffer *leaf; 8484cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8494cb5300bSChris Mason int type; 8504cb5300bSChris Mason int ret; 851a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8524cb5300bSChris Mason 8534cb5300bSChris Mason path = btrfs_alloc_path(); 8544cb5300bSChris Mason if (!path) 8554cb5300bSChris Mason return -ENOMEM; 8564cb5300bSChris Mason 857a4689d2bSDavid Sterba min_key.objectid = ino; 8584cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8594cb5300bSChris Mason min_key.offset = *off; 8604cb5300bSChris Mason 861a4689d2bSDavid Sterba max_key.objectid = ino; 8624cb5300bSChris Mason max_key.type = (u8)-1; 8634cb5300bSChris Mason max_key.offset = (u64)-1; 8644cb5300bSChris Mason 8654cb5300bSChris Mason path->keep_locks = 1; 8664cb5300bSChris Mason 8674cb5300bSChris Mason while(1) { 8684cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 869de78b51aSEric Sandeen path, newer_than); 8704cb5300bSChris Mason if (ret != 0) 8714cb5300bSChris Mason goto none; 872a4689d2bSDavid Sterba if (min_key.objectid != ino) 8734cb5300bSChris Mason goto none; 8744cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8754cb5300bSChris Mason goto none; 8764cb5300bSChris Mason 8774cb5300bSChris Mason leaf = path->nodes[0]; 8784cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8794cb5300bSChris Mason struct btrfs_file_extent_item); 8804cb5300bSChris Mason 8814cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8824cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8834cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8844cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8854cb5300bSChris Mason *off = min_key.offset; 8864cb5300bSChris Mason btrfs_free_path(path); 8874cb5300bSChris Mason return 0; 8884cb5300bSChris Mason } 8894cb5300bSChris Mason 8904cb5300bSChris Mason if (min_key.offset == (u64)-1) 8914cb5300bSChris Mason goto none; 8924cb5300bSChris Mason 8934cb5300bSChris Mason min_key.offset++; 8944cb5300bSChris Mason btrfs_release_path(path); 8954cb5300bSChris Mason } 8964cb5300bSChris Mason none: 8974cb5300bSChris Mason btrfs_free_path(path); 8984cb5300bSChris Mason return -ENOENT; 8994cb5300bSChris Mason } 9004cb5300bSChris Mason 9016c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 90217ce6ef8SLiu Bo { 90317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 904940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9056c282eb4SLi Zefan struct extent_map *em; 9066c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 907940100a4SChris Mason 908940100a4SChris Mason /* 909940100a4SChris Mason * hopefully we have this extent in the tree already, try without 910940100a4SChris Mason * the full extent lock 911940100a4SChris Mason */ 912940100a4SChris Mason read_lock(&em_tree->lock); 913940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 914940100a4SChris Mason read_unlock(&em_tree->lock); 915940100a4SChris Mason 916940100a4SChris Mason if (!em) { 917940100a4SChris Mason /* get the big lock and read metadata off disk */ 918d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 919940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 920d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 921940100a4SChris Mason 9226cf8bfbfSDan Carpenter if (IS_ERR(em)) 9236c282eb4SLi Zefan return NULL; 924940100a4SChris Mason } 925940100a4SChris Mason 9266c282eb4SLi Zefan return em; 9276c282eb4SLi Zefan } 9286c282eb4SLi Zefan 9296c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9306c282eb4SLi Zefan { 9316c282eb4SLi Zefan struct extent_map *next; 9326c282eb4SLi Zefan bool ret = true; 9336c282eb4SLi Zefan 9346c282eb4SLi Zefan /* this is the last extent */ 9356c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9366c282eb4SLi Zefan return false; 9376c282eb4SLi Zefan 9386c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9396c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9406c282eb4SLi Zefan ret = false; 9416c282eb4SLi Zefan 9426c282eb4SLi Zefan free_extent_map(next); 9436c282eb4SLi Zefan return ret; 9446c282eb4SLi Zefan } 9456c282eb4SLi Zefan 9466c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 947a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 948a43a2111SAndrew Mahone int compress) 9496c282eb4SLi Zefan { 9506c282eb4SLi Zefan struct extent_map *em; 9516c282eb4SLi Zefan int ret = 1; 9526c282eb4SLi Zefan bool next_mergeable = true; 9536c282eb4SLi Zefan 9546c282eb4SLi Zefan /* 9556c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9566c282eb4SLi Zefan * defragging it 9576c282eb4SLi Zefan */ 9586c282eb4SLi Zefan if (start < *defrag_end) 9596c282eb4SLi Zefan return 1; 9606c282eb4SLi Zefan 9616c282eb4SLi Zefan *skip = 0; 9626c282eb4SLi Zefan 9636c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9646c282eb4SLi Zefan if (!em) 9656c282eb4SLi Zefan return 0; 9666c282eb4SLi Zefan 967940100a4SChris Mason /* this will cover holes, and inline extents */ 96817ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 969940100a4SChris Mason ret = 0; 97017ce6ef8SLiu Bo goto out; 97117ce6ef8SLiu Bo } 97217ce6ef8SLiu Bo 9736c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 974940100a4SChris Mason 975940100a4SChris Mason /* 9766c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9776c282eb4SLi Zefan * real extent, don't bother defragging it 978940100a4SChris Mason */ 979a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9806c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 981940100a4SChris Mason ret = 0; 98217ce6ef8SLiu Bo out: 983940100a4SChris Mason /* 984940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 985940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 986940100a4SChris Mason * so that the next tiny extent will force a defrag. 987940100a4SChris Mason * 988940100a4SChris Mason * The end result of this is that tiny extents before a single big 989940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 990940100a4SChris Mason */ 991940100a4SChris Mason if (ret) { 992940100a4SChris Mason *defrag_end = extent_map_end(em); 993940100a4SChris Mason } else { 994940100a4SChris Mason *last_len = 0; 995940100a4SChris Mason *skip = extent_map_end(em); 996940100a4SChris Mason *defrag_end = 0; 997940100a4SChris Mason } 998940100a4SChris Mason 999940100a4SChris Mason free_extent_map(em); 1000940100a4SChris Mason return ret; 1001940100a4SChris Mason } 1002940100a4SChris Mason 10034cb5300bSChris Mason /* 10044cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10054cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10064cb5300bSChris Mason * to COW and defrag. 10074cb5300bSChris Mason * 10084cb5300bSChris Mason * It also makes sure the delalloc code has enough 10094cb5300bSChris Mason * dirty data to avoid making new small extents as part 10104cb5300bSChris Mason * of the defrag 10114cb5300bSChris Mason * 10124cb5300bSChris Mason * It's a good idea to start RA on this range 10134cb5300bSChris Mason * before calling this. 10144cb5300bSChris Mason */ 10154cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10164cb5300bSChris Mason struct page **pages, 10174cb5300bSChris Mason unsigned long start_index, 10184cb5300bSChris Mason int num_pages) 1019f46b5a66SChristoph Hellwig { 10204cb5300bSChris Mason unsigned long file_end; 10214cb5300bSChris Mason u64 isize = i_size_read(inode); 1022f46b5a66SChristoph Hellwig u64 page_start; 1023f46b5a66SChristoph Hellwig u64 page_end; 10241f12bd06SLiu Bo u64 page_cnt; 10254cb5300bSChris Mason int ret; 10264cb5300bSChris Mason int i; 10274cb5300bSChris Mason int i_done; 10284cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10294cb5300bSChris Mason struct extent_state *cached_state = NULL; 1030600a45e1SMiao Xie struct extent_io_tree *tree; 10313b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10324cb5300bSChris Mason 10334cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10341f12bd06SLiu Bo if (!isize || start_index > file_end) 10351f12bd06SLiu Bo return 0; 10361f12bd06SLiu Bo 10371f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10384cb5300bSChris Mason 10394cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10401f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10414cb5300bSChris Mason if (ret) 10424cb5300bSChris Mason return ret; 10434cb5300bSChris Mason i_done = 0; 1044600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10454cb5300bSChris Mason 10464cb5300bSChris Mason /* step one, lock all the pages */ 10471f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10484cb5300bSChris Mason struct page *page; 1049600a45e1SMiao Xie again: 1050a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10513b16a4e3SJosef Bacik start_index + i, mask); 10524cb5300bSChris Mason if (!page) 10534cb5300bSChris Mason break; 10544cb5300bSChris Mason 1055600a45e1SMiao Xie page_start = page_offset(page); 1056600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1057600a45e1SMiao Xie while (1) { 1058d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1059600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1060600a45e1SMiao Xie page_start); 1061d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1062600a45e1SMiao Xie if (!ordered) 1063600a45e1SMiao Xie break; 1064600a45e1SMiao Xie 1065600a45e1SMiao Xie unlock_page(page); 1066600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1067600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1068600a45e1SMiao Xie lock_page(page); 10691f12bd06SLiu Bo /* 10701f12bd06SLiu Bo * we unlocked the page above, so we need check if 10711f12bd06SLiu Bo * it was released or not. 10721f12bd06SLiu Bo */ 10731f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10741f12bd06SLiu Bo unlock_page(page); 10751f12bd06SLiu Bo page_cache_release(page); 10761f12bd06SLiu Bo goto again; 10771f12bd06SLiu Bo } 1078600a45e1SMiao Xie } 1079600a45e1SMiao Xie 10804cb5300bSChris Mason if (!PageUptodate(page)) { 10814cb5300bSChris Mason btrfs_readpage(NULL, page); 10824cb5300bSChris Mason lock_page(page); 10834cb5300bSChris Mason if (!PageUptodate(page)) { 10844cb5300bSChris Mason unlock_page(page); 10854cb5300bSChris Mason page_cache_release(page); 10864cb5300bSChris Mason ret = -EIO; 10874cb5300bSChris Mason break; 10884cb5300bSChris Mason } 10894cb5300bSChris Mason } 1090600a45e1SMiao Xie 1091600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1092600a45e1SMiao Xie unlock_page(page); 1093600a45e1SMiao Xie page_cache_release(page); 1094600a45e1SMiao Xie goto again; 1095600a45e1SMiao Xie } 1096600a45e1SMiao Xie 10974cb5300bSChris Mason pages[i] = page; 10984cb5300bSChris Mason i_done++; 10994cb5300bSChris Mason } 11004cb5300bSChris Mason if (!i_done || ret) 11014cb5300bSChris Mason goto out; 11024cb5300bSChris Mason 11034cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11044cb5300bSChris Mason goto out; 11054cb5300bSChris Mason 11064cb5300bSChris Mason /* 11074cb5300bSChris Mason * so now we have a nice long stream of locked 11084cb5300bSChris Mason * and up to date pages, lets wait on them 11094cb5300bSChris Mason */ 11104cb5300bSChris Mason for (i = 0; i < i_done; i++) 11114cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11124cb5300bSChris Mason 11134cb5300bSChris Mason page_start = page_offset(pages[0]); 11144cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11154cb5300bSChris Mason 11164cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1117d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11184cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11194cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11209e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11219e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11224cb5300bSChris Mason 11231f12bd06SLiu Bo if (i_done != page_cnt) { 11249e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11259e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11269e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11274cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11281f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11294cb5300bSChris Mason } 11304cb5300bSChris Mason 11314cb5300bSChris Mason 11329e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11339e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11344cb5300bSChris Mason 11354cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11364cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11374cb5300bSChris Mason GFP_NOFS); 11384cb5300bSChris Mason 11394cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11404cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11414cb5300bSChris Mason ClearPageChecked(pages[i]); 11424cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11434cb5300bSChris Mason set_page_dirty(pages[i]); 11444cb5300bSChris Mason unlock_page(pages[i]); 11454cb5300bSChris Mason page_cache_release(pages[i]); 11464cb5300bSChris Mason } 11474cb5300bSChris Mason return i_done; 11484cb5300bSChris Mason out: 11494cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11504cb5300bSChris Mason unlock_page(pages[i]); 11514cb5300bSChris Mason page_cache_release(pages[i]); 11524cb5300bSChris Mason } 11531f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11544cb5300bSChris Mason return ret; 11554cb5300bSChris Mason 11564cb5300bSChris Mason } 11574cb5300bSChris Mason 11584cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11594cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11604cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11614cb5300bSChris Mason { 11624cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11634cb5300bSChris Mason struct file_ra_state *ra = NULL; 11644cb5300bSChris Mason unsigned long last_index; 1165151a31b2SLi Zefan u64 isize = i_size_read(inode); 1166940100a4SChris Mason u64 last_len = 0; 1167940100a4SChris Mason u64 skip = 0; 1168940100a4SChris Mason u64 defrag_end = 0; 11694cb5300bSChris Mason u64 newer_off = range->start; 1170f46b5a66SChristoph Hellwig unsigned long i; 1171008873eaSLi Zefan unsigned long ra_index = 0; 1172f46b5a66SChristoph Hellwig int ret; 11734cb5300bSChris Mason int defrag_count = 0; 11741a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11754cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1176008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1177008873eaSLi Zefan int cluster = max_cluster; 11784cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11794cb5300bSChris Mason struct page **pages = NULL; 11804cb5300bSChris Mason 11810abd5b17SLiu Bo if (isize == 0) 11820abd5b17SLiu Bo return 0; 11830abd5b17SLiu Bo 11840abd5b17SLiu Bo if (range->start >= isize) 11850abd5b17SLiu Bo return -EINVAL; 11861a419d85SLi Zefan 11871a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11881a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11891a419d85SLi Zefan return -EINVAL; 11901a419d85SLi Zefan if (range->compress_type) 11911a419d85SLi Zefan compress_type = range->compress_type; 11921a419d85SLi Zefan } 1193f46b5a66SChristoph Hellwig 11940abd5b17SLiu Bo if (extent_thresh == 0) 11950abd5b17SLiu Bo extent_thresh = 256 * 1024; 1196f46b5a66SChristoph Hellwig 11974cb5300bSChris Mason /* 11984cb5300bSChris Mason * if we were not given a file, allocate a readahead 11994cb5300bSChris Mason * context 12004cb5300bSChris Mason */ 12014cb5300bSChris Mason if (!file) { 12024cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12034cb5300bSChris Mason if (!ra) 12044cb5300bSChris Mason return -ENOMEM; 12054cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12064cb5300bSChris Mason } else { 12074cb5300bSChris Mason ra = &file->f_ra; 12084cb5300bSChris Mason } 12094cb5300bSChris Mason 1210008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 12114cb5300bSChris Mason GFP_NOFS); 12124cb5300bSChris Mason if (!pages) { 12134cb5300bSChris Mason ret = -ENOMEM; 12144cb5300bSChris Mason goto out_ra; 12154cb5300bSChris Mason } 12164cb5300bSChris Mason 12174cb5300bSChris Mason /* find the last page to defrag */ 12181e701a32SChris Mason if (range->start + range->len > range->start) { 1219151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12201e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12211e701a32SChris Mason } else { 1222151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12231e701a32SChris Mason } 12241e701a32SChris Mason 12254cb5300bSChris Mason if (newer_than) { 12264cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12274cb5300bSChris Mason &newer_off, 64 * 1024); 12284cb5300bSChris Mason if (!ret) { 12294cb5300bSChris Mason range->start = newer_off; 12304cb5300bSChris Mason /* 12314cb5300bSChris Mason * we always align our defrag to help keep 12324cb5300bSChris Mason * the extents in the file evenly spaced 12334cb5300bSChris Mason */ 12344cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12354cb5300bSChris Mason } else 12364cb5300bSChris Mason goto out_ra; 12374cb5300bSChris Mason } else { 12381e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12394cb5300bSChris Mason } 12404cb5300bSChris Mason if (!max_to_defrag) 12417ec31b54SLiu Bo max_to_defrag = last_index + 1; 12424cb5300bSChris Mason 12432a0f7f57SLi Zefan /* 12442a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12452a0f7f57SLi Zefan * written sequentially. 12462a0f7f57SLi Zefan */ 12472a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12482a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12492a0f7f57SLi Zefan 1250f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1251f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1252f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12534cb5300bSChris Mason /* 12544cb5300bSChris Mason * make sure we stop running if someone unmounts 12554cb5300bSChris Mason * the FS 12564cb5300bSChris Mason */ 12574cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12584cb5300bSChris Mason break; 12594cb5300bSChris Mason 1260210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1261210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1262210549ebSDavid Sterba ret = -EAGAIN; 1263210549ebSDavid Sterba break; 1264210549ebSDavid Sterba } 1265210549ebSDavid Sterba 126666c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12676c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1268a43a2111SAndrew Mahone &defrag_end, range->flags & 1269a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1270940100a4SChris Mason unsigned long next; 1271940100a4SChris Mason /* 1272940100a4SChris Mason * the should_defrag function tells us how much to skip 1273940100a4SChris Mason * bump our counter by the suggested amount 1274940100a4SChris Mason */ 1275940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1276940100a4SChris Mason i = max(i + 1, next); 1277940100a4SChris Mason continue; 1278940100a4SChris Mason } 1279008873eaSLi Zefan 1280008873eaSLi Zefan if (!newer_than) { 1281008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1282008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1283008873eaSLi Zefan cluster = min(cluster, max_cluster); 1284008873eaSLi Zefan } else { 1285008873eaSLi Zefan cluster = max_cluster; 1286008873eaSLi Zefan } 1287008873eaSLi Zefan 12881e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 12891a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1290940100a4SChris Mason 1291008873eaSLi Zefan if (i + cluster > ra_index) { 1292008873eaSLi Zefan ra_index = max(i, ra_index); 1293008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1294008873eaSLi Zefan cluster); 1295008873eaSLi Zefan ra_index += max_cluster; 1296008873eaSLi Zefan } 12974cb5300bSChris Mason 1298ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1299008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1300ecb8bea8SLiu Bo if (ret < 0) { 1301ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13024cb5300bSChris Mason goto out_ra; 1303ecb8bea8SLiu Bo } 13044cb5300bSChris Mason 13054cb5300bSChris Mason defrag_count += ret; 1306d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1307ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13084cb5300bSChris Mason 13094cb5300bSChris Mason if (newer_than) { 13104cb5300bSChris Mason if (newer_off == (u64)-1) 13114cb5300bSChris Mason break; 13124cb5300bSChris Mason 1313e1f041e1SLiu Bo if (ret > 0) 1314e1f041e1SLiu Bo i += ret; 1315e1f041e1SLiu Bo 13164cb5300bSChris Mason newer_off = max(newer_off + 1, 13174cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13184cb5300bSChris Mason 13194cb5300bSChris Mason ret = find_new_extents(root, inode, 13204cb5300bSChris Mason newer_than, &newer_off, 13214cb5300bSChris Mason 64 * 1024); 13224cb5300bSChris Mason if (!ret) { 13234cb5300bSChris Mason range->start = newer_off; 13244cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13254cb5300bSChris Mason } else { 13264cb5300bSChris Mason break; 1327940100a4SChris Mason } 13284cb5300bSChris Mason } else { 1329008873eaSLi Zefan if (ret > 0) { 1330cbcc8326SLi Zefan i += ret; 1331008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1332008873eaSLi Zefan } else { 1333940100a4SChris Mason i++; 1334008873eaSLi Zefan last_len = 0; 1335008873eaSLi Zefan } 1336f46b5a66SChristoph Hellwig } 13374cb5300bSChris Mason } 1338f46b5a66SChristoph Hellwig 13391e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13401e701a32SChris Mason filemap_flush(inode->i_mapping); 13411e701a32SChris Mason 13421e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13431e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13441e701a32SChris Mason * we have to make sure the IO is actually started and that 13451e701a32SChris Mason * ordered extents get created before we return 13461e701a32SChris Mason */ 13471e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13481e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13491e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13501e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13511e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13521e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13531e701a32SChris Mason } 13541e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13551e701a32SChris Mason 13561e701a32SChris Mason mutex_lock(&inode->i_mutex); 1357261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 13581e701a32SChris Mason mutex_unlock(&inode->i_mutex); 13591e701a32SChris Mason } 13601e701a32SChris Mason 13611a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13622b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13631a419d85SLi Zefan } 13641a419d85SLi Zefan 136560ccf82fSDiego Calleja ret = defrag_count; 1366940100a4SChris Mason 13674cb5300bSChris Mason out_ra: 13684cb5300bSChris Mason if (!file) 13694cb5300bSChris Mason kfree(ra); 13704cb5300bSChris Mason kfree(pages); 1371940100a4SChris Mason return ret; 1372f46b5a66SChristoph Hellwig } 1373f46b5a66SChristoph Hellwig 1374198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 137576dda93cSYan, Zheng void __user *arg) 1376f46b5a66SChristoph Hellwig { 1377f46b5a66SChristoph Hellwig u64 new_size; 1378f46b5a66SChristoph Hellwig u64 old_size; 1379f46b5a66SChristoph Hellwig u64 devid = 1; 1380496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1381f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1382f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1383f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1384f46b5a66SChristoph Hellwig char *sizestr; 1385f46b5a66SChristoph Hellwig char *devstr = NULL; 1386f46b5a66SChristoph Hellwig int ret = 0; 1387f46b5a66SChristoph Hellwig int mod = 0; 1388f46b5a66SChristoph Hellwig 1389e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1390e441d54dSChris Mason return -EPERM; 1391e441d54dSChris Mason 1392198605a8SMiao Xie ret = mnt_want_write_file(file); 1393198605a8SMiao Xie if (ret) 1394198605a8SMiao Xie return ret; 1395198605a8SMiao Xie 13965ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13975ac00addSStefan Behrens 1)) { 13985ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 139997547676SMiao Xie mnt_drop_write_file(file); 14002c0c9da0SIlya Dryomov return -EINVAL; 1401c9e9f97bSIlya Dryomov } 1402c9e9f97bSIlya Dryomov 14035ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1404dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1405c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1406c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1407c9e9f97bSIlya Dryomov goto out; 1408c9e9f97bSIlya Dryomov } 14095516e595SMark Fasheh 14105516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1411f46b5a66SChristoph Hellwig 1412f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1413f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1414f46b5a66SChristoph Hellwig if (devstr) { 1415f46b5a66SChristoph Hellwig char *end; 1416f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1417f46b5a66SChristoph Hellwig *devstr = '\0'; 1418f46b5a66SChristoph Hellwig devstr = vol_args->name; 1419f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1420dfd79829SMiao Xie if (!devid) { 1421dfd79829SMiao Xie ret = -EINVAL; 1422dfd79829SMiao Xie goto out_free; 1423dfd79829SMiao Xie } 14245bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 142521380931SJoel Becker (unsigned long long)devid); 1426f46b5a66SChristoph Hellwig } 1427dba60f3fSMiao Xie 1428aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1429f46b5a66SChristoph Hellwig if (!device) { 14305bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 143121380931SJoel Becker (unsigned long long)devid); 1432dfd79829SMiao Xie ret = -ENODEV; 1433c9e9f97bSIlya Dryomov goto out_free; 1434f46b5a66SChristoph Hellwig } 1435dba60f3fSMiao Xie 1436dba60f3fSMiao Xie if (!device->writeable) { 14374e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1438dba60f3fSMiao Xie "readonly device %llu\n", 1439a8c4a33bSChris Mason (unsigned long long)devid); 1440dfd79829SMiao Xie ret = -EPERM; 14414e42ae1bSLiu Bo goto out_free; 14424e42ae1bSLiu Bo } 14434e42ae1bSLiu Bo 1444f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1445f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1446f46b5a66SChristoph Hellwig else { 1447f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1448f46b5a66SChristoph Hellwig mod = -1; 1449f46b5a66SChristoph Hellwig sizestr++; 1450f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1451f46b5a66SChristoph Hellwig mod = 1; 1452f46b5a66SChristoph Hellwig sizestr++; 1453f46b5a66SChristoph Hellwig } 145491748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1455f46b5a66SChristoph Hellwig if (new_size == 0) { 1456f46b5a66SChristoph Hellwig ret = -EINVAL; 1457c9e9f97bSIlya Dryomov goto out_free; 1458f46b5a66SChristoph Hellwig } 1459f46b5a66SChristoph Hellwig } 1460f46b5a66SChristoph Hellwig 146163a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1462dfd79829SMiao Xie ret = -EPERM; 146363a212abSStefan Behrens goto out_free; 146463a212abSStefan Behrens } 146563a212abSStefan Behrens 1466f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1467f46b5a66SChristoph Hellwig 1468f46b5a66SChristoph Hellwig if (mod < 0) { 1469f46b5a66SChristoph Hellwig if (new_size > old_size) { 1470f46b5a66SChristoph Hellwig ret = -EINVAL; 1471c9e9f97bSIlya Dryomov goto out_free; 1472f46b5a66SChristoph Hellwig } 1473f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1474f46b5a66SChristoph Hellwig } else if (mod > 0) { 1475f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1476f46b5a66SChristoph Hellwig } 1477f46b5a66SChristoph Hellwig 1478f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1479f46b5a66SChristoph Hellwig ret = -EINVAL; 1480c9e9f97bSIlya Dryomov goto out_free; 1481f46b5a66SChristoph Hellwig } 1482f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1483f46b5a66SChristoph Hellwig ret = -EFBIG; 1484c9e9f97bSIlya Dryomov goto out_free; 1485f46b5a66SChristoph Hellwig } 1486f46b5a66SChristoph Hellwig 1487f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1488f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1489f46b5a66SChristoph Hellwig 1490606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1491606686eeSJosef Bacik rcu_str_deref(device->name), 1492606686eeSJosef Bacik (unsigned long long)new_size); 1493f46b5a66SChristoph Hellwig 1494f46b5a66SChristoph Hellwig if (new_size > old_size) { 1495a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 149698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 149798d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1498c9e9f97bSIlya Dryomov goto out_free; 149998d5dc13STsutomu Itoh } 1500f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1501f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1502ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1503f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15040253f40eSjeff.liu } /* equal, nothing need to do */ 1505f46b5a66SChristoph Hellwig 1506c9e9f97bSIlya Dryomov out_free: 1507f46b5a66SChristoph Hellwig kfree(vol_args); 1508c9e9f97bSIlya Dryomov out: 1509c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15105ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 151118f39c41SIlya Dryomov mnt_drop_write_file(file); 1512f46b5a66SChristoph Hellwig return ret; 1513f46b5a66SChristoph Hellwig } 1514f46b5a66SChristoph Hellwig 151572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15166f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15176f72c7e2SArne Jansen u64 *transid, bool readonly, 15188696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1519f46b5a66SChristoph Hellwig { 1520f46b5a66SChristoph Hellwig int namelen; 15213de4586cSChris Mason int ret = 0; 1522f46b5a66SChristoph Hellwig 1523a874a63eSLiu Bo ret = mnt_want_write_file(file); 1524a874a63eSLiu Bo if (ret) 1525a874a63eSLiu Bo goto out; 1526a874a63eSLiu Bo 152772fd032eSSage Weil namelen = strlen(name); 152872fd032eSSage Weil if (strchr(name, '/')) { 1529f46b5a66SChristoph Hellwig ret = -EINVAL; 1530a874a63eSLiu Bo goto out_drop_write; 1531f46b5a66SChristoph Hellwig } 1532f46b5a66SChristoph Hellwig 153316780cabSChris Mason if (name[0] == '.' && 153416780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 153516780cabSChris Mason ret = -EEXIST; 1536a874a63eSLiu Bo goto out_drop_write; 153716780cabSChris Mason } 153816780cabSChris Mason 15393de4586cSChris Mason if (subvol) { 154072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15416f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1542cb8e7090SChristoph Hellwig } else { 15432903ff01SAl Viro struct fd src = fdget(fd); 15443de4586cSChris Mason struct inode *src_inode; 15452903ff01SAl Viro if (!src.file) { 15463de4586cSChris Mason ret = -EINVAL; 1547a874a63eSLiu Bo goto out_drop_write; 15483de4586cSChris Mason } 15493de4586cSChris Mason 1550496ad9aaSAl Viro src_inode = file_inode(src.file); 1551496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1552d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1553d397712bSChris Mason "another FS\n"); 15543de4586cSChris Mason ret = -EINVAL; 1555ecd18815SAl Viro } else { 155672fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 155772fd032eSSage Weil BTRFS_I(src_inode)->root, 15586f72c7e2SArne Jansen transid, readonly, inherit); 1559ecd18815SAl Viro } 15602903ff01SAl Viro fdput(src); 1561cb8e7090SChristoph Hellwig } 1562a874a63eSLiu Bo out_drop_write: 1563a874a63eSLiu Bo mnt_drop_write_file(file); 1564f46b5a66SChristoph Hellwig out: 156572fd032eSSage Weil return ret; 156672fd032eSSage Weil } 156772fd032eSSage Weil 156872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1569fa0d2b9bSLi Zefan void __user *arg, int subvol) 157072fd032eSSage Weil { 1571fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 157272fd032eSSage Weil int ret; 157372fd032eSSage Weil 1574fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1575fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1576fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1577fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1578fa0d2b9bSLi Zefan 1579fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1580b83cc969SLi Zefan vol_args->fd, subvol, 15816f72c7e2SArne Jansen NULL, false, NULL); 1582fa0d2b9bSLi Zefan 1583fa0d2b9bSLi Zefan kfree(vol_args); 1584fa0d2b9bSLi Zefan return ret; 1585fa0d2b9bSLi Zefan } 1586fa0d2b9bSLi Zefan 1587fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1588fa0d2b9bSLi Zefan void __user *arg, int subvol) 1589fa0d2b9bSLi Zefan { 1590fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1591fa0d2b9bSLi Zefan int ret; 1592fdfb1e4fSLi Zefan u64 transid = 0; 1593fdfb1e4fSLi Zefan u64 *ptr = NULL; 1594b83cc969SLi Zefan bool readonly = false; 15956f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 159672fd032eSSage Weil 1597fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1598fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1599fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1600fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1601fdfb1e4fSLi Zefan 1602b83cc969SLi Zefan if (vol_args->flags & 16036f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 16046f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1605b83cc969SLi Zefan ret = -EOPNOTSUPP; 1606fdfb1e4fSLi Zefan goto out; 1607fdfb1e4fSLi Zefan } 1608fdfb1e4fSLi Zefan 1609fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1610fdfb1e4fSLi Zefan ptr = &transid; 1611b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1612b83cc969SLi Zefan readonly = true; 16136f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16146f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16156f72c7e2SArne Jansen ret = -EINVAL; 16166f72c7e2SArne Jansen goto out; 16176f72c7e2SArne Jansen } 16186f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16196f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16206f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16216f72c7e2SArne Jansen goto out; 16226f72c7e2SArne Jansen } 16236f72c7e2SArne Jansen } 162475eaa0e2SSage Weil 1625fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16266f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16278696c533SMiao Xie readonly, inherit); 162875eaa0e2SSage Weil 1629fdfb1e4fSLi Zefan if (ret == 0 && ptr && 163075eaa0e2SSage Weil copy_to_user(arg + 1631fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1632fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 163375eaa0e2SSage Weil ret = -EFAULT; 1634fdfb1e4fSLi Zefan out: 1635f46b5a66SChristoph Hellwig kfree(vol_args); 16366f72c7e2SArne Jansen kfree(inherit); 1637f46b5a66SChristoph Hellwig return ret; 1638f46b5a66SChristoph Hellwig } 1639f46b5a66SChristoph Hellwig 16400caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16410caa102dSLi Zefan void __user *arg) 16420caa102dSLi Zefan { 1643496ad9aaSAl Viro struct inode *inode = file_inode(file); 16440caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16450caa102dSLi Zefan int ret = 0; 16460caa102dSLi Zefan u64 flags = 0; 16470caa102dSLi Zefan 164833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16490caa102dSLi Zefan return -EINVAL; 16500caa102dSLi Zefan 16510caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16520caa102dSLi Zefan if (btrfs_root_readonly(root)) 16530caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16540caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16550caa102dSLi Zefan 16560caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16570caa102dSLi Zefan ret = -EFAULT; 16580caa102dSLi Zefan 16590caa102dSLi Zefan return ret; 16600caa102dSLi Zefan } 16610caa102dSLi Zefan 16620caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16630caa102dSLi Zefan void __user *arg) 16640caa102dSLi Zefan { 1665496ad9aaSAl Viro struct inode *inode = file_inode(file); 16660caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16670caa102dSLi Zefan struct btrfs_trans_handle *trans; 16680caa102dSLi Zefan u64 root_flags; 16690caa102dSLi Zefan u64 flags; 16700caa102dSLi Zefan int ret = 0; 16710caa102dSLi Zefan 1672b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1673b9ca0664SLiu Bo if (ret) 1674b9ca0664SLiu Bo goto out; 16750caa102dSLi Zefan 1676b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1677b9ca0664SLiu Bo ret = -EINVAL; 1678b9ca0664SLiu Bo goto out_drop_write; 1679b9ca0664SLiu Bo } 16800caa102dSLi Zefan 1681b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1682b9ca0664SLiu Bo ret = -EFAULT; 1683b9ca0664SLiu Bo goto out_drop_write; 1684b9ca0664SLiu Bo } 16850caa102dSLi Zefan 1686b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1687b9ca0664SLiu Bo ret = -EINVAL; 1688b9ca0664SLiu Bo goto out_drop_write; 1689b9ca0664SLiu Bo } 16900caa102dSLi Zefan 1691b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1692b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1693b9ca0664SLiu Bo goto out_drop_write; 1694b9ca0664SLiu Bo } 16950caa102dSLi Zefan 1696b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1697b9ca0664SLiu Bo ret = -EACCES; 1698b9ca0664SLiu Bo goto out_drop_write; 1699b9ca0664SLiu Bo } 1700b4dc2b8cSLi Zefan 17010caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17020caa102dSLi Zefan 17030caa102dSLi Zefan /* nothing to do */ 17040caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1705b9ca0664SLiu Bo goto out_drop_sem; 17060caa102dSLi Zefan 17070caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17080caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 17090caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17100caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17110caa102dSLi Zefan else 17120caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17130caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17140caa102dSLi Zefan 17150caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17160caa102dSLi Zefan if (IS_ERR(trans)) { 17170caa102dSLi Zefan ret = PTR_ERR(trans); 17180caa102dSLi Zefan goto out_reset; 17190caa102dSLi Zefan } 17200caa102dSLi Zefan 1721b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17220caa102dSLi Zefan &root->root_key, &root->root_item); 17230caa102dSLi Zefan 17240caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17250caa102dSLi Zefan out_reset: 17260caa102dSLi Zefan if (ret) 17270caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1728b9ca0664SLiu Bo out_drop_sem: 17290caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1730b9ca0664SLiu Bo out_drop_write: 1731b9ca0664SLiu Bo mnt_drop_write_file(file); 1732b9ca0664SLiu Bo out: 17330caa102dSLi Zefan return ret; 17340caa102dSLi Zefan } 17350caa102dSLi Zefan 173676dda93cSYan, Zheng /* 173776dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 173876dda93cSYan, Zheng */ 173976dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 174076dda93cSYan, Zheng { 174176dda93cSYan, Zheng struct btrfs_path *path; 1742175a2b87SJosef Bacik struct btrfs_dir_item *di; 174376dda93cSYan, Zheng struct btrfs_key key; 1744175a2b87SJosef Bacik u64 dir_id; 174576dda93cSYan, Zheng int ret; 174676dda93cSYan, Zheng 174776dda93cSYan, Zheng path = btrfs_alloc_path(); 174876dda93cSYan, Zheng if (!path) 174976dda93cSYan, Zheng return -ENOMEM; 175076dda93cSYan, Zheng 1751175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1752175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1753175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1754175a2b87SJosef Bacik dir_id, "default", 7, 0); 1755175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1756175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1757175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1758175a2b87SJosef Bacik ret = -ENOTEMPTY; 1759175a2b87SJosef Bacik goto out; 1760175a2b87SJosef Bacik } 1761175a2b87SJosef Bacik btrfs_release_path(path); 1762175a2b87SJosef Bacik } 1763175a2b87SJosef Bacik 176476dda93cSYan, Zheng key.objectid = root->root_key.objectid; 176576dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 176676dda93cSYan, Zheng key.offset = (u64)-1; 176776dda93cSYan, Zheng 176876dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 176976dda93cSYan, Zheng &key, path, 0, 0); 177076dda93cSYan, Zheng if (ret < 0) 177176dda93cSYan, Zheng goto out; 177276dda93cSYan, Zheng BUG_ON(ret == 0); 177376dda93cSYan, Zheng 177476dda93cSYan, Zheng ret = 0; 177576dda93cSYan, Zheng if (path->slots[0] > 0) { 177676dda93cSYan, Zheng path->slots[0]--; 177776dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 177876dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 177976dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 178076dda93cSYan, Zheng ret = -ENOTEMPTY; 178176dda93cSYan, Zheng } 178276dda93cSYan, Zheng out: 178376dda93cSYan, Zheng btrfs_free_path(path); 178476dda93cSYan, Zheng return ret; 178576dda93cSYan, Zheng } 178676dda93cSYan, Zheng 1787ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1788ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1789ac8e9819SChris Mason { 1790abc6e134SChris Mason struct btrfs_key test; 1791abc6e134SChris Mason int ret; 1792abc6e134SChris Mason 1793abc6e134SChris Mason test.objectid = sk->min_objectid; 1794abc6e134SChris Mason test.type = sk->min_type; 1795abc6e134SChris Mason test.offset = sk->min_offset; 1796abc6e134SChris Mason 1797abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1798abc6e134SChris Mason if (ret < 0) 1799ac8e9819SChris Mason return 0; 1800abc6e134SChris Mason 1801abc6e134SChris Mason test.objectid = sk->max_objectid; 1802abc6e134SChris Mason test.type = sk->max_type; 1803abc6e134SChris Mason test.offset = sk->max_offset; 1804abc6e134SChris Mason 1805abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1806abc6e134SChris Mason if (ret > 0) 1807ac8e9819SChris Mason return 0; 1808ac8e9819SChris Mason return 1; 1809ac8e9819SChris Mason } 1810ac8e9819SChris Mason 1811ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1812ac8e9819SChris Mason struct btrfs_path *path, 1813ac8e9819SChris Mason struct btrfs_key *key, 1814ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1815ac8e9819SChris Mason char *buf, 1816ac8e9819SChris Mason unsigned long *sk_offset, 1817ac8e9819SChris Mason int *num_found) 1818ac8e9819SChris Mason { 1819ac8e9819SChris Mason u64 found_transid; 1820ac8e9819SChris Mason struct extent_buffer *leaf; 1821ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1822ac8e9819SChris Mason unsigned long item_off; 1823ac8e9819SChris Mason unsigned long item_len; 1824ac8e9819SChris Mason int nritems; 1825ac8e9819SChris Mason int i; 1826ac8e9819SChris Mason int slot; 1827ac8e9819SChris Mason int ret = 0; 1828ac8e9819SChris Mason 1829ac8e9819SChris Mason leaf = path->nodes[0]; 1830ac8e9819SChris Mason slot = path->slots[0]; 1831ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1832ac8e9819SChris Mason 1833ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1834ac8e9819SChris Mason i = nritems; 1835ac8e9819SChris Mason goto advance_key; 1836ac8e9819SChris Mason } 1837ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1838ac8e9819SChris Mason 1839ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1840ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1841ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1842ac8e9819SChris Mason 184303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 184403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 184503b71c6cSGabriel de Perthuis continue; 184603b71c6cSGabriel de Perthuis 184703b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1848ac8e9819SChris Mason item_len = 0; 1849ac8e9819SChris Mason 1850ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1851ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1852ac8e9819SChris Mason ret = 1; 1853ac8e9819SChris Mason goto overflow; 1854ac8e9819SChris Mason } 1855ac8e9819SChris Mason 1856ac8e9819SChris Mason sh.objectid = key->objectid; 1857ac8e9819SChris Mason sh.offset = key->offset; 1858ac8e9819SChris Mason sh.type = key->type; 1859ac8e9819SChris Mason sh.len = item_len; 1860ac8e9819SChris Mason sh.transid = found_transid; 1861ac8e9819SChris Mason 1862ac8e9819SChris Mason /* copy search result header */ 1863ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1864ac8e9819SChris Mason *sk_offset += sizeof(sh); 1865ac8e9819SChris Mason 1866ac8e9819SChris Mason if (item_len) { 1867ac8e9819SChris Mason char *p = buf + *sk_offset; 1868ac8e9819SChris Mason /* copy the item */ 1869ac8e9819SChris Mason read_extent_buffer(leaf, p, 1870ac8e9819SChris Mason item_off, item_len); 1871ac8e9819SChris Mason *sk_offset += item_len; 1872ac8e9819SChris Mason } 1873e2156867SHugo Mills (*num_found)++; 1874ac8e9819SChris Mason 1875ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1876ac8e9819SChris Mason break; 1877ac8e9819SChris Mason } 1878ac8e9819SChris Mason advance_key: 1879ac8e9819SChris Mason ret = 0; 1880abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1881abc6e134SChris Mason key->offset++; 1882abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1883abc6e134SChris Mason key->offset = 0; 1884abc6e134SChris Mason key->type++; 1885abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1886abc6e134SChris Mason key->offset = 0; 1887abc6e134SChris Mason key->type = 0; 1888abc6e134SChris Mason key->objectid++; 1889abc6e134SChris Mason } else 1890abc6e134SChris Mason ret = 1; 1891ac8e9819SChris Mason overflow: 1892ac8e9819SChris Mason return ret; 1893ac8e9819SChris Mason } 1894ac8e9819SChris Mason 1895ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1896ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1897ac8e9819SChris Mason { 1898ac8e9819SChris Mason struct btrfs_root *root; 1899ac8e9819SChris Mason struct btrfs_key key; 1900ac8e9819SChris Mason struct btrfs_key max_key; 1901ac8e9819SChris Mason struct btrfs_path *path; 1902ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1903ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1904ac8e9819SChris Mason int ret; 1905ac8e9819SChris Mason int num_found = 0; 1906ac8e9819SChris Mason unsigned long sk_offset = 0; 1907ac8e9819SChris Mason 1908ac8e9819SChris Mason path = btrfs_alloc_path(); 1909ac8e9819SChris Mason if (!path) 1910ac8e9819SChris Mason return -ENOMEM; 1911ac8e9819SChris Mason 1912ac8e9819SChris Mason if (sk->tree_id == 0) { 1913ac8e9819SChris Mason /* search the root of the inode that was passed */ 1914ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1915ac8e9819SChris Mason } else { 1916ac8e9819SChris Mason key.objectid = sk->tree_id; 1917ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1918ac8e9819SChris Mason key.offset = (u64)-1; 1919ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1920ac8e9819SChris Mason if (IS_ERR(root)) { 1921ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1922ac8e9819SChris Mason sk->tree_id); 1923ac8e9819SChris Mason btrfs_free_path(path); 1924ac8e9819SChris Mason return -ENOENT; 1925ac8e9819SChris Mason } 1926ac8e9819SChris Mason } 1927ac8e9819SChris Mason 1928ac8e9819SChris Mason key.objectid = sk->min_objectid; 1929ac8e9819SChris Mason key.type = sk->min_type; 1930ac8e9819SChris Mason key.offset = sk->min_offset; 1931ac8e9819SChris Mason 1932ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1933ac8e9819SChris Mason max_key.type = sk->max_type; 1934ac8e9819SChris Mason max_key.offset = sk->max_offset; 1935ac8e9819SChris Mason 1936ac8e9819SChris Mason path->keep_locks = 1; 1937ac8e9819SChris Mason 1938ac8e9819SChris Mason while(1) { 1939de78b51aSEric Sandeen ret = btrfs_search_forward(root, &key, &max_key, path, 1940ac8e9819SChris Mason sk->min_transid); 1941ac8e9819SChris Mason if (ret != 0) { 1942ac8e9819SChris Mason if (ret > 0) 1943ac8e9819SChris Mason ret = 0; 1944ac8e9819SChris Mason goto err; 1945ac8e9819SChris Mason } 1946ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1947ac8e9819SChris Mason &sk_offset, &num_found); 1948b3b4aa74SDavid Sterba btrfs_release_path(path); 1949ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1950ac8e9819SChris Mason break; 1951ac8e9819SChris Mason 1952ac8e9819SChris Mason } 1953ac8e9819SChris Mason ret = 0; 1954ac8e9819SChris Mason err: 1955ac8e9819SChris Mason sk->nr_items = num_found; 1956ac8e9819SChris Mason btrfs_free_path(path); 1957ac8e9819SChris Mason return ret; 1958ac8e9819SChris Mason } 1959ac8e9819SChris Mason 1960ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1961ac8e9819SChris Mason void __user *argp) 1962ac8e9819SChris Mason { 1963ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1964ac8e9819SChris Mason struct inode *inode; 1965ac8e9819SChris Mason int ret; 1966ac8e9819SChris Mason 1967ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1968ac8e9819SChris Mason return -EPERM; 1969ac8e9819SChris Mason 19702354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19712354d08fSJulia Lawall if (IS_ERR(args)) 19722354d08fSJulia Lawall return PTR_ERR(args); 1973ac8e9819SChris Mason 1974496ad9aaSAl Viro inode = file_inode(file); 1975ac8e9819SChris Mason ret = search_ioctl(inode, args); 1976ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1977ac8e9819SChris Mason ret = -EFAULT; 1978ac8e9819SChris Mason kfree(args); 1979ac8e9819SChris Mason return ret; 1980ac8e9819SChris Mason } 1981ac8e9819SChris Mason 198298d377a0STARUISI Hiroaki /* 1983ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1984ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 198598d377a0STARUISI Hiroaki */ 198698d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 198798d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 198898d377a0STARUISI Hiroaki { 198998d377a0STARUISI Hiroaki struct btrfs_root *root; 199098d377a0STARUISI Hiroaki struct btrfs_key key; 1991ac8e9819SChris Mason char *ptr; 199298d377a0STARUISI Hiroaki int ret = -1; 199398d377a0STARUISI Hiroaki int slot; 199498d377a0STARUISI Hiroaki int len; 199598d377a0STARUISI Hiroaki int total_len = 0; 199698d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 199798d377a0STARUISI Hiroaki struct extent_buffer *l; 199898d377a0STARUISI Hiroaki struct btrfs_path *path; 199998d377a0STARUISI Hiroaki 200098d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 200198d377a0STARUISI Hiroaki name[0]='\0'; 200298d377a0STARUISI Hiroaki return 0; 200398d377a0STARUISI Hiroaki } 200498d377a0STARUISI Hiroaki 200598d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 200698d377a0STARUISI Hiroaki if (!path) 200798d377a0STARUISI Hiroaki return -ENOMEM; 200898d377a0STARUISI Hiroaki 2009ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 201098d377a0STARUISI Hiroaki 201198d377a0STARUISI Hiroaki key.objectid = tree_id; 201298d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 201398d377a0STARUISI Hiroaki key.offset = (u64)-1; 201498d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 201598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 201698d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 20178ad6fcabSChris Mason ret = -ENOENT; 20188ad6fcabSChris Mason goto out; 201998d377a0STARUISI Hiroaki } 202098d377a0STARUISI Hiroaki 202198d377a0STARUISI Hiroaki key.objectid = dirid; 202298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20238ad6fcabSChris Mason key.offset = (u64)-1; 202498d377a0STARUISI Hiroaki 202598d377a0STARUISI Hiroaki while(1) { 202698d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 202798d377a0STARUISI Hiroaki if (ret < 0) 202898d377a0STARUISI Hiroaki goto out; 202918674c6cSFilipe David Borba Manana else if (ret > 0) { 203018674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 203118674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 203218674c6cSFilipe David Borba Manana if (ret < 0) 203318674c6cSFilipe David Borba Manana goto out; 203418674c6cSFilipe David Borba Manana else if (ret > 0) { 2035ac8e9819SChris Mason ret = -ENOENT; 203698d377a0STARUISI Hiroaki goto out; 2037ac8e9819SChris Mason } 203818674c6cSFilipe David Borba Manana } 203918674c6cSFilipe David Borba Manana 204018674c6cSFilipe David Borba Manana l = path->nodes[0]; 204118674c6cSFilipe David Borba Manana slot = path->slots[0]; 204218674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 204398d377a0STARUISI Hiroaki 204498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 204598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 204698d377a0STARUISI Hiroaki ptr -= len + 1; 204798d377a0STARUISI Hiroaki total_len += len + 1; 2048a696cf35SFilipe David Borba Manana if (ptr < name) { 2049a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 205098d377a0STARUISI Hiroaki goto out; 2051a696cf35SFilipe David Borba Manana } 205298d377a0STARUISI Hiroaki 205398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 205498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 205598d377a0STARUISI Hiroaki 205698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 205798d377a0STARUISI Hiroaki break; 205898d377a0STARUISI Hiroaki 2059b3b4aa74SDavid Sterba btrfs_release_path(path); 206098d377a0STARUISI Hiroaki key.objectid = key.offset; 20618ad6fcabSChris Mason key.offset = (u64)-1; 206298d377a0STARUISI Hiroaki dirid = key.objectid; 206398d377a0STARUISI Hiroaki } 206477906a50SLi Zefan memmove(name, ptr, total_len); 206598d377a0STARUISI Hiroaki name[total_len]='\0'; 206698d377a0STARUISI Hiroaki ret = 0; 206798d377a0STARUISI Hiroaki out: 206898d377a0STARUISI Hiroaki btrfs_free_path(path); 2069ac8e9819SChris Mason return ret; 2070ac8e9819SChris Mason } 2071ac8e9819SChris Mason 2072ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2073ac8e9819SChris Mason void __user *argp) 2074ac8e9819SChris Mason { 2075ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2076ac8e9819SChris Mason struct inode *inode; 2077ac8e9819SChris Mason int ret; 2078ac8e9819SChris Mason 2079ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2080ac8e9819SChris Mason return -EPERM; 2081ac8e9819SChris Mason 20822354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20832354d08fSJulia Lawall if (IS_ERR(args)) 20842354d08fSJulia Lawall return PTR_ERR(args); 2085c2b96929SDan Carpenter 2086496ad9aaSAl Viro inode = file_inode(file); 2087ac8e9819SChris Mason 20881b53ac4dSChris Mason if (args->treeid == 0) 20891b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20901b53ac4dSChris Mason 2091ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2092ac8e9819SChris Mason args->treeid, args->objectid, 2093ac8e9819SChris Mason args->name); 2094ac8e9819SChris Mason 2095ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2096ac8e9819SChris Mason ret = -EFAULT; 2097ac8e9819SChris Mason 2098ac8e9819SChris Mason kfree(args); 209998d377a0STARUISI Hiroaki return ret; 210098d377a0STARUISI Hiroaki } 210198d377a0STARUISI Hiroaki 210276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 210376dda93cSYan, Zheng void __user *arg) 210476dda93cSYan, Zheng { 210576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 210676dda93cSYan, Zheng struct dentry *dentry; 210776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 210876dda93cSYan, Zheng struct inode *inode; 210976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 211076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 211176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 211276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2113c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2114c58aaad2SMiao Xie u64 qgroup_reserved; 211576dda93cSYan, Zheng int namelen; 211676dda93cSYan, Zheng int ret; 211776dda93cSYan, Zheng int err = 0; 211876dda93cSYan, Zheng 211976dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 212076dda93cSYan, Zheng if (IS_ERR(vol_args)) 212176dda93cSYan, Zheng return PTR_ERR(vol_args); 212276dda93cSYan, Zheng 212376dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 212476dda93cSYan, Zheng namelen = strlen(vol_args->name); 212576dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 212676dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 212776dda93cSYan, Zheng err = -EINVAL; 212876dda93cSYan, Zheng goto out; 212976dda93cSYan, Zheng } 213076dda93cSYan, Zheng 2131a561be71SAl Viro err = mnt_want_write_file(file); 213276dda93cSYan, Zheng if (err) 213376dda93cSYan, Zheng goto out; 213476dda93cSYan, Zheng 21355c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21365c50c9b8SDavid Sterba if (err == -EINTR) 21375c50c9b8SDavid Sterba goto out; 213876dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 213976dda93cSYan, Zheng if (IS_ERR(dentry)) { 214076dda93cSYan, Zheng err = PTR_ERR(dentry); 214176dda93cSYan, Zheng goto out_unlock_dir; 214276dda93cSYan, Zheng } 214376dda93cSYan, Zheng 214476dda93cSYan, Zheng if (!dentry->d_inode) { 214576dda93cSYan, Zheng err = -ENOENT; 214676dda93cSYan, Zheng goto out_dput; 214776dda93cSYan, Zheng } 214876dda93cSYan, Zheng 214976dda93cSYan, Zheng inode = dentry->d_inode; 21504260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21514260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 21524260f7c7SSage Weil /* 21534260f7c7SSage Weil * Regular user. Only allow this with a special mount 21544260f7c7SSage Weil * option, when the user has write+exec access to the 21554260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21564260f7c7SSage Weil * allowed. 21574260f7c7SSage Weil * 21584260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21594260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21604260f7c7SSage Weil * otherwise be able to delete. 21614260f7c7SSage Weil * 21624260f7c7SSage Weil * Users who want to delete empty subvols should try 21634260f7c7SSage Weil * rmdir(2). 21644260f7c7SSage Weil */ 21654260f7c7SSage Weil err = -EPERM; 21664260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21674260f7c7SSage Weil goto out_dput; 21684260f7c7SSage Weil 21694260f7c7SSage Weil /* 21704260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21714260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21724260f7c7SSage Weil * must be called on the dentry referencing the root 21734260f7c7SSage Weil * of the subvol, not a random directory contained 21744260f7c7SSage Weil * within it. 21754260f7c7SSage Weil */ 21764260f7c7SSage Weil err = -EINVAL; 21774260f7c7SSage Weil if (root == dest) 21784260f7c7SSage Weil goto out_dput; 21794260f7c7SSage Weil 21804260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21814260f7c7SSage Weil if (err) 21824260f7c7SSage Weil goto out_dput; 21835c39da5bSMiao Xie } 21844260f7c7SSage Weil 21855c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21864260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21874260f7c7SSage Weil if (err) 21884260f7c7SSage Weil goto out_dput; 21894260f7c7SSage Weil 219033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 219176dda93cSYan, Zheng err = -EINVAL; 219276dda93cSYan, Zheng goto out_dput; 219376dda93cSYan, Zheng } 219476dda93cSYan, Zheng 219576dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 219676dda93cSYan, Zheng err = d_invalidate(dentry); 219776dda93cSYan, Zheng if (err) 219876dda93cSYan, Zheng goto out_unlock; 219976dda93cSYan, Zheng 220076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 220176dda93cSYan, Zheng 220276dda93cSYan, Zheng err = may_destroy_subvol(dest); 220376dda93cSYan, Zheng if (err) 220476dda93cSYan, Zheng goto out_up_write; 220576dda93cSYan, Zheng 2206c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2207c58aaad2SMiao Xie /* 2208c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2209c58aaad2SMiao Xie * ref/backref. 2210c58aaad2SMiao Xie */ 2211c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2212ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2213c58aaad2SMiao Xie if (err) 2214c58aaad2SMiao Xie goto out_up_write; 2215c58aaad2SMiao Xie 2216a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2217a22285a6SYan, Zheng if (IS_ERR(trans)) { 2218a22285a6SYan, Zheng err = PTR_ERR(trans); 2219c58aaad2SMiao Xie goto out_release; 2220a22285a6SYan, Zheng } 2221c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2222c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2223a22285a6SYan, Zheng 222476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 222576dda93cSYan, Zheng dest->root_key.objectid, 222676dda93cSYan, Zheng dentry->d_name.name, 222776dda93cSYan, Zheng dentry->d_name.len); 222879787eaaSJeff Mahoney if (ret) { 222979787eaaSJeff Mahoney err = ret; 223079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 223179787eaaSJeff Mahoney goto out_end_trans; 223279787eaaSJeff Mahoney } 223376dda93cSYan, Zheng 223476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 223576dda93cSYan, Zheng 223676dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 223776dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 223876dda93cSYan, Zheng dest->root_item.drop_level = 0; 223976dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 224076dda93cSYan, Zheng 2241d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 224276dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 224376dda93cSYan, Zheng root->fs_info->tree_root, 224476dda93cSYan, Zheng dest->root_key.objectid); 224579787eaaSJeff Mahoney if (ret) { 224679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 224779787eaaSJeff Mahoney err = ret; 224879787eaaSJeff Mahoney goto out_end_trans; 2249d68fc57bSYan, Zheng } 225079787eaaSJeff Mahoney } 2251dd5f9615SStefan Behrens 2252dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2253dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2254dd5f9615SStefan Behrens dest->root_key.objectid); 2255dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2256dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2257dd5f9615SStefan Behrens err = ret; 2258dd5f9615SStefan Behrens goto out_end_trans; 2259dd5f9615SStefan Behrens } 2260dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2261dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2262dd5f9615SStefan Behrens dest->root_item.received_uuid, 2263dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2264dd5f9615SStefan Behrens dest->root_key.objectid); 2265dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2266dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2267dd5f9615SStefan Behrens err = ret; 2268dd5f9615SStefan Behrens goto out_end_trans; 2269dd5f9615SStefan Behrens } 2270dd5f9615SStefan Behrens } 2271dd5f9615SStefan Behrens 227279787eaaSJeff Mahoney out_end_trans: 2273c58aaad2SMiao Xie trans->block_rsv = NULL; 2274c58aaad2SMiao Xie trans->bytes_reserved = 0; 2275531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 227679787eaaSJeff Mahoney if (ret && !err) 227779787eaaSJeff Mahoney err = ret; 227876dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2279c58aaad2SMiao Xie out_release: 2280c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 228176dda93cSYan, Zheng out_up_write: 228276dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 228376dda93cSYan, Zheng out_unlock: 228476dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 228576dda93cSYan, Zheng if (!err) { 2286efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 228776dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 228876dda93cSYan, Zheng d_delete(dentry); 2289fa6ac876SLiu Bo 2290fa6ac876SLiu Bo /* the last ref */ 2291fa6ac876SLiu Bo if (dest->cache_inode) { 2292fa6ac876SLiu Bo iput(dest->cache_inode); 2293fa6ac876SLiu Bo dest->cache_inode = NULL; 2294fa6ac876SLiu Bo } 229576dda93cSYan, Zheng } 229676dda93cSYan, Zheng out_dput: 229776dda93cSYan, Zheng dput(dentry); 229876dda93cSYan, Zheng out_unlock_dir: 229976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 23002a79f17eSAl Viro mnt_drop_write_file(file); 230176dda93cSYan, Zheng out: 230276dda93cSYan, Zheng kfree(vol_args); 230376dda93cSYan, Zheng return err; 230476dda93cSYan, Zheng } 230576dda93cSYan, Zheng 23061e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2307f46b5a66SChristoph Hellwig { 2308496ad9aaSAl Viro struct inode *inode = file_inode(file); 2309f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 23101e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2311c146afadSYan Zheng int ret; 2312c146afadSYan Zheng 231325122d15SIlya Dryomov ret = mnt_want_write_file(file); 231425122d15SIlya Dryomov if (ret) 231525122d15SIlya Dryomov return ret; 2316b83cc969SLi Zefan 231725122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 231825122d15SIlya Dryomov ret = -EROFS; 231925122d15SIlya Dryomov goto out; 23205ac00addSStefan Behrens } 2321f46b5a66SChristoph Hellwig 2322f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2323f46b5a66SChristoph Hellwig case S_IFDIR: 2324e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2325e441d54dSChris Mason ret = -EPERM; 2326e441d54dSChris Mason goto out; 2327e441d54dSChris Mason } 2328de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23298929ecfaSYan, Zheng if (ret) 23308929ecfaSYan, Zheng goto out; 2331de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2332f46b5a66SChristoph Hellwig break; 2333f46b5a66SChristoph Hellwig case S_IFREG: 2334e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2335e441d54dSChris Mason ret = -EINVAL; 2336e441d54dSChris Mason goto out; 2337e441d54dSChris Mason } 23381e701a32SChris Mason 23391e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 23401e701a32SChris Mason if (!range) { 23411e701a32SChris Mason ret = -ENOMEM; 23421e701a32SChris Mason goto out; 23431e701a32SChris Mason } 23441e701a32SChris Mason 23451e701a32SChris Mason if (argp) { 23461e701a32SChris Mason if (copy_from_user(range, argp, 23471e701a32SChris Mason sizeof(*range))) { 23481e701a32SChris Mason ret = -EFAULT; 23491e701a32SChris Mason kfree(range); 2350683be16eSDan Carpenter goto out; 23511e701a32SChris Mason } 23521e701a32SChris Mason /* compression requires us to start the IO */ 23531e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 23541e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 23551e701a32SChris Mason range->extent_thresh = (u32)-1; 23561e701a32SChris Mason } 23571e701a32SChris Mason } else { 23581e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23591e701a32SChris Mason range->len = (u64)-1; 23601e701a32SChris Mason } 2361496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23624cb5300bSChris Mason range, 0, 0); 23634cb5300bSChris Mason if (ret > 0) 23644cb5300bSChris Mason ret = 0; 23651e701a32SChris Mason kfree(range); 2366f46b5a66SChristoph Hellwig break; 23678929ecfaSYan, Zheng default: 23688929ecfaSYan, Zheng ret = -EINVAL; 2369f46b5a66SChristoph Hellwig } 2370e441d54dSChris Mason out: 237125122d15SIlya Dryomov mnt_drop_write_file(file); 2372e441d54dSChris Mason return ret; 2373f46b5a66SChristoph Hellwig } 2374f46b5a66SChristoph Hellwig 2375b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2376f46b5a66SChristoph Hellwig { 2377f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2378f46b5a66SChristoph Hellwig int ret; 2379f46b5a66SChristoph Hellwig 2380e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2381e441d54dSChris Mason return -EPERM; 2382e441d54dSChris Mason 23835ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23845ac00addSStefan Behrens 1)) { 23855ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 23862c0c9da0SIlya Dryomov return -EINVAL; 2387c9e9f97bSIlya Dryomov } 2388c9e9f97bSIlya Dryomov 23895ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2390dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2391c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2392c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2393c9e9f97bSIlya Dryomov goto out; 2394c9e9f97bSIlya Dryomov } 2395f46b5a66SChristoph Hellwig 23965516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2397f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2398f46b5a66SChristoph Hellwig 2399f46b5a66SChristoph Hellwig kfree(vol_args); 2400c9e9f97bSIlya Dryomov out: 2401c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24025ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2403f46b5a66SChristoph Hellwig return ret; 2404f46b5a66SChristoph Hellwig } 2405f46b5a66SChristoph Hellwig 2406da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2407f46b5a66SChristoph Hellwig { 2408496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2409f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2410f46b5a66SChristoph Hellwig int ret; 2411f46b5a66SChristoph Hellwig 2412e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2413e441d54dSChris Mason return -EPERM; 2414e441d54dSChris Mason 2415da24927bSMiao Xie ret = mnt_want_write_file(file); 2416da24927bSMiao Xie if (ret) 2417da24927bSMiao Xie return ret; 2418c146afadSYan Zheng 2419dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2420c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2421c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2422c9e9f97bSIlya Dryomov goto out; 2423c9e9f97bSIlya Dryomov } 2424f46b5a66SChristoph Hellwig 24255516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2426f46b5a66SChristoph Hellwig 2427183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2428183860f6SAnand Jain 1)) { 2429183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2430183860f6SAnand Jain goto out; 2431183860f6SAnand Jain } 2432183860f6SAnand Jain 2433183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2434183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2435c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24365ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2437183860f6SAnand Jain 2438183860f6SAnand Jain out: 2439183860f6SAnand Jain kfree(vol_args); 24404ac20c70SIlya Dryomov mnt_drop_write_file(file); 2441f46b5a66SChristoph Hellwig return ret; 2442f46b5a66SChristoph Hellwig } 2443f46b5a66SChristoph Hellwig 2444475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2445475f6387SJan Schmidt { 2446027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2447475f6387SJan Schmidt struct btrfs_device *device; 2448475f6387SJan Schmidt struct btrfs_device *next; 2449475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2450027ed2f0SLi Zefan int ret = 0; 2451475f6387SJan Schmidt 2452475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2453475f6387SJan Schmidt return -EPERM; 2454475f6387SJan Schmidt 2455027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2456027ed2f0SLi Zefan if (!fi_args) 2457027ed2f0SLi Zefan return -ENOMEM; 2458027ed2f0SLi Zefan 2459027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2460027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2461475f6387SJan Schmidt 2462475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2463475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2464027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2465027ed2f0SLi Zefan fi_args->max_id = device->devid; 2466475f6387SJan Schmidt } 2467475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2468475f6387SJan Schmidt 2469027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2470027ed2f0SLi Zefan ret = -EFAULT; 2471475f6387SJan Schmidt 2472027ed2f0SLi Zefan kfree(fi_args); 2473027ed2f0SLi Zefan return ret; 2474475f6387SJan Schmidt } 2475475f6387SJan Schmidt 2476475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2477475f6387SJan Schmidt { 2478475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2479475f6387SJan Schmidt struct btrfs_device *dev; 2480475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2481475f6387SJan Schmidt int ret = 0; 2482475f6387SJan Schmidt char *s_uuid = NULL; 2483475f6387SJan Schmidt 2484475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2485475f6387SJan Schmidt return -EPERM; 2486475f6387SJan Schmidt 2487475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2488475f6387SJan Schmidt if (IS_ERR(di_args)) 2489475f6387SJan Schmidt return PTR_ERR(di_args); 2490475f6387SJan Schmidt 2491dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2492475f6387SJan Schmidt s_uuid = di_args->uuid; 2493475f6387SJan Schmidt 2494475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2495aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2496475f6387SJan Schmidt 2497475f6387SJan Schmidt if (!dev) { 2498475f6387SJan Schmidt ret = -ENODEV; 2499475f6387SJan Schmidt goto out; 2500475f6387SJan Schmidt } 2501475f6387SJan Schmidt 2502475f6387SJan Schmidt di_args->devid = dev->devid; 2503475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2504475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2505475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2506a27202fbSJim Meyering if (dev->name) { 2507606686eeSJosef Bacik struct rcu_string *name; 2508606686eeSJosef Bacik 2509606686eeSJosef Bacik rcu_read_lock(); 2510606686eeSJosef Bacik name = rcu_dereference(dev->name); 2511606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2512606686eeSJosef Bacik rcu_read_unlock(); 2513a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2514a27202fbSJim Meyering } else { 251599ba55adSStefan Behrens di_args->path[0] = '\0'; 2516a27202fbSJim Meyering } 2517475f6387SJan Schmidt 2518475f6387SJan Schmidt out: 251955793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2520475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2521475f6387SJan Schmidt ret = -EFAULT; 2522475f6387SJan Schmidt 2523475f6387SJan Schmidt kfree(di_args); 2524475f6387SJan Schmidt return ret; 2525475f6387SJan Schmidt } 2526475f6387SJan Schmidt 2527416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2528416161dbSMark Fasheh { 2529416161dbSMark Fasheh struct page *page; 2530416161dbSMark Fasheh pgoff_t index; 2531416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2532416161dbSMark Fasheh 2533416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2534416161dbSMark Fasheh 2535416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2536416161dbSMark Fasheh if (!page) 2537416161dbSMark Fasheh return NULL; 2538416161dbSMark Fasheh 2539416161dbSMark Fasheh if (!PageUptodate(page)) { 2540416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2541416161dbSMark Fasheh 0)) 2542416161dbSMark Fasheh return NULL; 2543416161dbSMark Fasheh lock_page(page); 2544416161dbSMark Fasheh if (!PageUptodate(page)) { 2545416161dbSMark Fasheh unlock_page(page); 2546416161dbSMark Fasheh page_cache_release(page); 2547416161dbSMark Fasheh return NULL; 2548416161dbSMark Fasheh } 2549416161dbSMark Fasheh } 2550416161dbSMark Fasheh unlock_page(page); 2551416161dbSMark Fasheh 2552416161dbSMark Fasheh return page; 2553416161dbSMark Fasheh } 2554416161dbSMark Fasheh 255577fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 255677fe20dcSMark Fasheh { 255777fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 255877fe20dcSMark Fasheh another, and lock file content */ 255977fe20dcSMark Fasheh while (1) { 256077fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 256177fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 256277fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 256377fe20dcSMark Fasheh off + len - 1); 256477fe20dcSMark Fasheh if (!ordered && 256577fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 256677fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 256777fe20dcSMark Fasheh break; 256877fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 256977fe20dcSMark Fasheh if (ordered) 257077fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 257177fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 257277fe20dcSMark Fasheh } 257377fe20dcSMark Fasheh } 257477fe20dcSMark Fasheh 2575416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2576416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2577416161dbSMark Fasheh { 2578416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2579416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2580416161dbSMark Fasheh 2581416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2582416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2583416161dbSMark Fasheh } 2584416161dbSMark Fasheh 2585416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2586416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2587416161dbSMark Fasheh { 2588416161dbSMark Fasheh if (inode1 < inode2) { 2589416161dbSMark Fasheh swap(inode1, inode2); 2590416161dbSMark Fasheh swap(loff1, loff2); 2591416161dbSMark Fasheh } 2592416161dbSMark Fasheh 2593416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2594416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2595416161dbSMark Fasheh if (inode1 != inode2) { 2596416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2597416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2598416161dbSMark Fasheh } 2599416161dbSMark Fasheh } 2600416161dbSMark Fasheh 2601416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2602416161dbSMark Fasheh u64 dst_loff, u64 len) 2603416161dbSMark Fasheh { 2604416161dbSMark Fasheh int ret = 0; 2605416161dbSMark Fasheh struct page *src_page, *dst_page; 2606416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2607416161dbSMark Fasheh void *addr, *dst_addr; 2608416161dbSMark Fasheh 2609416161dbSMark Fasheh while (len) { 2610416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2611416161dbSMark Fasheh cmp_len = len; 2612416161dbSMark Fasheh 2613416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2614416161dbSMark Fasheh if (!src_page) 2615416161dbSMark Fasheh return -EINVAL; 2616416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2617416161dbSMark Fasheh if (!dst_page) { 2618416161dbSMark Fasheh page_cache_release(src_page); 2619416161dbSMark Fasheh return -EINVAL; 2620416161dbSMark Fasheh } 2621416161dbSMark Fasheh addr = kmap_atomic(src_page); 2622416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2623416161dbSMark Fasheh 2624416161dbSMark Fasheh flush_dcache_page(src_page); 2625416161dbSMark Fasheh flush_dcache_page(dst_page); 2626416161dbSMark Fasheh 2627416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2628416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2629416161dbSMark Fasheh 2630416161dbSMark Fasheh kunmap_atomic(addr); 2631416161dbSMark Fasheh kunmap_atomic(dst_addr); 2632416161dbSMark Fasheh page_cache_release(src_page); 2633416161dbSMark Fasheh page_cache_release(dst_page); 2634416161dbSMark Fasheh 2635416161dbSMark Fasheh if (ret) 2636416161dbSMark Fasheh break; 2637416161dbSMark Fasheh 2638416161dbSMark Fasheh loff += cmp_len; 2639416161dbSMark Fasheh dst_loff += cmp_len; 2640416161dbSMark Fasheh len -= cmp_len; 2641416161dbSMark Fasheh } 2642416161dbSMark Fasheh 2643416161dbSMark Fasheh return ret; 2644416161dbSMark Fasheh } 2645416161dbSMark Fasheh 2646416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2647416161dbSMark Fasheh { 2648416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2649416161dbSMark Fasheh 2650416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2651416161dbSMark Fasheh return -EINVAL; 2652416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2653416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2654416161dbSMark Fasheh return -EINVAL; 2655416161dbSMark Fasheh 2656416161dbSMark Fasheh return 0; 2657416161dbSMark Fasheh } 2658416161dbSMark Fasheh 2659416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2660416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2661416161dbSMark Fasheh { 2662416161dbSMark Fasheh int ret; 2663416161dbSMark Fasheh 2664416161dbSMark Fasheh /* 2665416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2666416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2667416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2668416161dbSMark Fasheh */ 2669416161dbSMark Fasheh if (src == dst) 2670416161dbSMark Fasheh return -EINVAL; 2671416161dbSMark Fasheh 2672416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2673416161dbSMark Fasheh 2674416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2675416161dbSMark Fasheh if (ret) 2676416161dbSMark Fasheh goto out_unlock; 2677416161dbSMark Fasheh 2678416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2679416161dbSMark Fasheh if (ret) 2680416161dbSMark Fasheh goto out_unlock; 2681416161dbSMark Fasheh 2682416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2683416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2684416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2685416161dbSMark Fasheh ret = -EINVAL; 2686416161dbSMark Fasheh goto out_unlock; 2687416161dbSMark Fasheh } 2688416161dbSMark Fasheh 2689416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2690416161dbSMark Fasheh if (ret == 0) 2691416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2692416161dbSMark Fasheh 2693416161dbSMark Fasheh out_unlock: 2694416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2695416161dbSMark Fasheh 2696416161dbSMark Fasheh return ret; 2697416161dbSMark Fasheh } 2698416161dbSMark Fasheh 2699416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2700416161dbSMark Fasheh 2701416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2702416161dbSMark Fasheh void __user *argp) 2703416161dbSMark Fasheh { 2704416161dbSMark Fasheh struct btrfs_ioctl_same_args *args = argp; 2705416161dbSMark Fasheh struct btrfs_ioctl_same_args same; 2706416161dbSMark Fasheh struct btrfs_ioctl_same_extent_info info; 2707416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2708416161dbSMark Fasheh struct file *dst_file = NULL; 2709416161dbSMark Fasheh struct inode *dst; 2710416161dbSMark Fasheh u64 off; 2711416161dbSMark Fasheh u64 len; 2712416161dbSMark Fasheh int i; 2713416161dbSMark Fasheh int ret; 2714416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2715416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2716416161dbSMark Fasheh 2717416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2718416161dbSMark Fasheh return -EINVAL; 2719416161dbSMark Fasheh 2720416161dbSMark Fasheh ret = mnt_want_write_file(file); 2721416161dbSMark Fasheh if (ret) 2722416161dbSMark Fasheh return ret; 2723416161dbSMark Fasheh 2724416161dbSMark Fasheh if (copy_from_user(&same, 2725416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2726416161dbSMark Fasheh sizeof(same))) { 2727416161dbSMark Fasheh ret = -EFAULT; 2728416161dbSMark Fasheh goto out; 2729416161dbSMark Fasheh } 2730416161dbSMark Fasheh 2731416161dbSMark Fasheh off = same.logical_offset; 2732416161dbSMark Fasheh len = same.length; 2733416161dbSMark Fasheh 2734416161dbSMark Fasheh /* 2735416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2736416161dbSMark Fasheh * This is intended to bound the total time spent in this 2737416161dbSMark Fasheh * ioctl to something sane. 2738416161dbSMark Fasheh */ 2739416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2740416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2741416161dbSMark Fasheh 2742416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2743416161dbSMark Fasheh /* 2744416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2745416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2746416161dbSMark Fasheh * this situation without an update. 2747416161dbSMark Fasheh */ 2748416161dbSMark Fasheh ret = -EINVAL; 2749416161dbSMark Fasheh goto out; 2750416161dbSMark Fasheh } 2751416161dbSMark Fasheh 2752416161dbSMark Fasheh ret = -EISDIR; 2753416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2754416161dbSMark Fasheh goto out; 2755416161dbSMark Fasheh 2756416161dbSMark Fasheh ret = -EACCES; 2757416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2758416161dbSMark Fasheh goto out; 2759416161dbSMark Fasheh 2760416161dbSMark Fasheh ret = 0; 2761416161dbSMark Fasheh for (i = 0; i < same.dest_count; i++) { 2762416161dbSMark Fasheh if (copy_from_user(&info, &args->info[i], sizeof(info))) { 2763416161dbSMark Fasheh ret = -EFAULT; 2764416161dbSMark Fasheh goto out; 2765416161dbSMark Fasheh } 2766416161dbSMark Fasheh 2767416161dbSMark Fasheh info.bytes_deduped = 0; 2768416161dbSMark Fasheh 2769416161dbSMark Fasheh dst_file = fget(info.fd); 2770416161dbSMark Fasheh if (!dst_file) { 2771416161dbSMark Fasheh info.status = -EBADF; 2772416161dbSMark Fasheh goto next; 2773416161dbSMark Fasheh } 2774416161dbSMark Fasheh 2775416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2776416161dbSMark Fasheh info.status = -EINVAL; 2777416161dbSMark Fasheh goto next; 2778416161dbSMark Fasheh } 2779416161dbSMark Fasheh 2780416161dbSMark Fasheh info.status = -EXDEV; 2781416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2782416161dbSMark Fasheh goto next; 2783416161dbSMark Fasheh 2784416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2785416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2786416161dbSMark Fasheh goto next; 2787416161dbSMark Fasheh 2788416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2789416161dbSMark Fasheh info.status = -EISDIR; 2790416161dbSMark Fasheh goto next; 2791416161dbSMark Fasheh } 2792416161dbSMark Fasheh 2793416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2794416161dbSMark Fasheh info.status = -EACCES; 2795416161dbSMark Fasheh goto next; 2796416161dbSMark Fasheh } 2797416161dbSMark Fasheh 2798416161dbSMark Fasheh info.status = btrfs_extent_same(src, off, len, dst, 2799416161dbSMark Fasheh info.logical_offset); 2800416161dbSMark Fasheh if (info.status == 0) 2801416161dbSMark Fasheh info.bytes_deduped += len; 2802416161dbSMark Fasheh 2803416161dbSMark Fasheh next: 2804416161dbSMark Fasheh if (dst_file) 2805416161dbSMark Fasheh fput(dst_file); 2806416161dbSMark Fasheh 2807416161dbSMark Fasheh if (__put_user_unaligned(info.status, &args->info[i].status) || 2808416161dbSMark Fasheh __put_user_unaligned(info.bytes_deduped, 2809416161dbSMark Fasheh &args->info[i].bytes_deduped)) { 2810416161dbSMark Fasheh ret = -EFAULT; 2811416161dbSMark Fasheh goto out; 2812416161dbSMark Fasheh } 2813416161dbSMark Fasheh } 2814416161dbSMark Fasheh 2815416161dbSMark Fasheh out: 2816416161dbSMark Fasheh mnt_drop_write_file(file); 2817416161dbSMark Fasheh return ret; 2818416161dbSMark Fasheh } 2819416161dbSMark Fasheh 282032b7c687SMark Fasheh /** 282132b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 282232b7c687SMark Fasheh * 282332b7c687SMark Fasheh * @src: Inode to clone from 282432b7c687SMark Fasheh * @inode: Inode to clone to 282532b7c687SMark Fasheh * @off: Offset within source to start clone from 282632b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 282732b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 282832b7c687SMark Fasheh * identical values here 282932b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 283032b7c687SMark Fasheh */ 283132b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 283232b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2833f46b5a66SChristoph Hellwig { 2834f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 283532b7c687SMark Fasheh struct btrfs_path *path = NULL; 2836f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 283732b7c687SMark Fasheh struct btrfs_trans_handle *trans; 283832b7c687SMark Fasheh char *buf = NULL; 2839ae01a0abSYan Zheng struct btrfs_key key; 2840f46b5a66SChristoph Hellwig u32 nritems; 2841f46b5a66SChristoph Hellwig int slot; 2842ae01a0abSYan Zheng int ret; 284332b7c687SMark Fasheh u64 len = olen_aligned; 2844ae01a0abSYan Zheng 2845ae01a0abSYan Zheng ret = -ENOMEM; 2846ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2847ae01a0abSYan Zheng if (!buf) 284832b7c687SMark Fasheh return ret; 2849ae01a0abSYan Zheng 2850ae01a0abSYan Zheng path = btrfs_alloc_path(); 2851ae01a0abSYan Zheng if (!path) { 2852ae01a0abSYan Zheng vfree(buf); 285332b7c687SMark Fasheh return ret; 2854ae01a0abSYan Zheng } 285532b7c687SMark Fasheh 2856ae01a0abSYan Zheng path->reada = 2; 2857c5c9cd4dSSage Weil /* clone data */ 285833345d01SLi Zefan key.objectid = btrfs_ino(src); 2859ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2860ae01a0abSYan Zheng key.offset = 0; 2861f46b5a66SChristoph Hellwig 2862f46b5a66SChristoph Hellwig while (1) { 2863f46b5a66SChristoph Hellwig /* 2864f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2865f46b5a66SChristoph Hellwig * tree. 2866f46b5a66SChristoph Hellwig */ 2867362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2868362a20c5SDavid Sterba 0, 0); 2869f46b5a66SChristoph Hellwig if (ret < 0) 2870f46b5a66SChristoph Hellwig goto out; 2871f46b5a66SChristoph Hellwig 2872ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2873ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2874362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2875f46b5a66SChristoph Hellwig if (ret < 0) 2876f46b5a66SChristoph Hellwig goto out; 2877f46b5a66SChristoph Hellwig if (ret > 0) 2878f46b5a66SChristoph Hellwig break; 2879ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2880f46b5a66SChristoph Hellwig } 2881f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2882f46b5a66SChristoph Hellwig slot = path->slots[0]; 2883f46b5a66SChristoph Hellwig 2884ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2885d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 288633345d01SLi Zefan key.objectid != btrfs_ino(src)) 2887f46b5a66SChristoph Hellwig break; 2888f46b5a66SChristoph Hellwig 2889c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2890c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2891c5c9cd4dSSage Weil int type; 289231840ae1SZheng Yan u32 size; 289331840ae1SZheng Yan struct btrfs_key new_key; 2894c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2895c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2896c5c9cd4dSSage Weil u8 comp; 2897b5384d48SSage Weil u64 endoff; 289831840ae1SZheng Yan 289931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 290031840ae1SZheng Yan read_extent_buffer(leaf, buf, 290131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 290231840ae1SZheng Yan size); 2903c5c9cd4dSSage Weil 2904c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2905c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2906c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2907c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2908c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2909c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2910d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2911d397712bSChris Mason extent); 2912d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2913d397712bSChris Mason extent); 2914c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2915d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2916d397712bSChris Mason extent); 2917c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2918c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2919c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2920c5c9cd4dSSage Weil extent); 2921c5c9cd4dSSage Weil } 2922b3b4aa74SDavid Sterba btrfs_release_path(path); 292331840ae1SZheng Yan 2924050006a7SSage Weil if (key.offset + datal <= off || 2925aa42ffd9SLiu Bo key.offset >= off + len - 1) 2926c5c9cd4dSSage Weil goto next; 2927c5c9cd4dSSage Weil 292831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 292933345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 29304d728ec7SLi Zefan if (off <= key.offset) 2931c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 29324d728ec7SLi Zefan else 29334d728ec7SLi Zefan new_key.offset = destoff; 2934c5c9cd4dSSage Weil 2935b6f3409bSSage Weil /* 2936b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2937b6f3409bSSage Weil * 1 - add new extent 2938b6f3409bSSage Weil * 1 - inode update 2939b6f3409bSSage Weil */ 2940b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2941a22285a6SYan, Zheng if (IS_ERR(trans)) { 2942a22285a6SYan, Zheng ret = PTR_ERR(trans); 2943a22285a6SYan, Zheng goto out; 2944a22285a6SYan, Zheng } 2945a22285a6SYan, Zheng 2946c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2947c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2948d72c0842SLi Zefan /* 2949d72c0842SLi Zefan * a | --- range to clone ---| b 2950d72c0842SLi Zefan * | ------------- extent ------------- | 2951d72c0842SLi Zefan */ 2952d72c0842SLi Zefan 2953d72c0842SLi Zefan /* substract range b */ 2954d72c0842SLi Zefan if (key.offset + datal > off + len) 2955d72c0842SLi Zefan datal = off + len - key.offset; 2956d72c0842SLi Zefan 2957d72c0842SLi Zefan /* substract range a */ 2958a22285a6SYan, Zheng if (off > key.offset) { 2959a22285a6SYan, Zheng datao += off - key.offset; 2960a22285a6SYan, Zheng datal -= off - key.offset; 2961a22285a6SYan, Zheng } 2962a22285a6SYan, Zheng 29635dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2964a22285a6SYan, Zheng new_key.offset, 2965a22285a6SYan, Zheng new_key.offset + datal, 29662671485dSJosef Bacik 1); 296779787eaaSJeff Mahoney if (ret) { 296879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 296979787eaaSJeff Mahoney ret); 297079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 297179787eaaSJeff Mahoney goto out; 297279787eaaSJeff Mahoney } 2973a22285a6SYan, Zheng 297431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 297531840ae1SZheng Yan &new_key, size); 297679787eaaSJeff Mahoney if (ret) { 297779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 297879787eaaSJeff Mahoney ret); 297979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 298079787eaaSJeff Mahoney goto out; 298179787eaaSJeff Mahoney } 298231840ae1SZheng Yan 298331840ae1SZheng Yan leaf = path->nodes[0]; 298431840ae1SZheng Yan slot = path->slots[0]; 298531840ae1SZheng Yan write_extent_buffer(leaf, buf, 298631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 298731840ae1SZheng Yan size); 2988ae01a0abSYan Zheng 2989f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2990f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2991c5c9cd4dSSage Weil 2992c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2993c5c9cd4dSSage Weil if (!disko) 2994c5c9cd4dSSage Weil datao = 0; 2995c5c9cd4dSSage Weil 2996c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2997c5c9cd4dSSage Weil datao); 2998c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2999c5c9cd4dSSage Weil datal); 3000c5c9cd4dSSage Weil if (disko) { 3001c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3002ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 30035d4f98a2SYan Zheng disko, diskl, 0, 3004f46b5a66SChristoph Hellwig root->root_key.objectid, 300533345d01SLi Zefan btrfs_ino(inode), 300666d7e7f0SArne Jansen new_key.offset - datao, 300766d7e7f0SArne Jansen 0); 300879787eaaSJeff Mahoney if (ret) { 300979787eaaSJeff Mahoney btrfs_abort_transaction(trans, 301079787eaaSJeff Mahoney root, 301179787eaaSJeff Mahoney ret); 301279787eaaSJeff Mahoney btrfs_end_transaction(trans, 301379787eaaSJeff Mahoney root); 301479787eaaSJeff Mahoney goto out; 301579787eaaSJeff Mahoney 301679787eaaSJeff Mahoney } 3017f46b5a66SChristoph Hellwig } 3018c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3019c5c9cd4dSSage Weil u64 skip = 0; 3020c5c9cd4dSSage Weil u64 trim = 0; 3021c5c9cd4dSSage Weil if (off > key.offset) { 3022c5c9cd4dSSage Weil skip = off - key.offset; 3023c5c9cd4dSSage Weil new_key.offset += skip; 302431840ae1SZheng Yan } 3025d397712bSChris Mason 3026c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3027c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3028d397712bSChris Mason 3029c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3030c5c9cd4dSSage Weil ret = -EINVAL; 3031a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3032c5c9cd4dSSage Weil goto out; 303331840ae1SZheng Yan } 3034c5c9cd4dSSage Weil size -= skip + trim; 3035c5c9cd4dSSage Weil datal -= skip + trim; 3036a22285a6SYan, Zheng 30375dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3038a22285a6SYan, Zheng new_key.offset, 3039a22285a6SYan, Zheng new_key.offset + datal, 30402671485dSJosef Bacik 1); 304179787eaaSJeff Mahoney if (ret) { 304279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304379787eaaSJeff Mahoney ret); 304479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304579787eaaSJeff Mahoney goto out; 304679787eaaSJeff Mahoney } 3047a22285a6SYan, Zheng 3048c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3049c5c9cd4dSSage Weil &new_key, size); 305079787eaaSJeff Mahoney if (ret) { 305179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 305279787eaaSJeff Mahoney ret); 305379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 305479787eaaSJeff Mahoney goto out; 305579787eaaSJeff Mahoney } 3056c5c9cd4dSSage Weil 3057c5c9cd4dSSage Weil if (skip) { 3058d397712bSChris Mason u32 start = 3059d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3060c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3061c5c9cd4dSSage Weil datal); 3062c5c9cd4dSSage Weil } 3063c5c9cd4dSSage Weil 3064c5c9cd4dSSage Weil leaf = path->nodes[0]; 3065c5c9cd4dSSage Weil slot = path->slots[0]; 3066c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3067c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3068c5c9cd4dSSage Weil size); 3069c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3070c5c9cd4dSSage Weil } 3071c5c9cd4dSSage Weil 3072c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3073b3b4aa74SDavid Sterba btrfs_release_path(path); 3074c5c9cd4dSSage Weil 30750c4d2d95SJosef Bacik inode_inc_iversion(inode); 3076a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3077b5384d48SSage Weil 3078b5384d48SSage Weil /* 3079b5384d48SSage Weil * we round up to the block size at eof when 3080b5384d48SSage Weil * determining which extents to clone above, 3081b5384d48SSage Weil * but shouldn't round up the file size 3082b5384d48SSage Weil */ 3083b5384d48SSage Weil endoff = new_key.offset + datal; 30845f3888ffSLi Zefan if (endoff > destoff+olen) 30855f3888ffSLi Zefan endoff = destoff+olen; 3086b5384d48SSage Weil if (endoff > inode->i_size) 3087b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3088b5384d48SSage Weil 3089a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 309079787eaaSJeff Mahoney if (ret) { 309179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3092a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 309379787eaaSJeff Mahoney goto out; 309479787eaaSJeff Mahoney } 309579787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3096a22285a6SYan, Zheng } 3097c5c9cd4dSSage Weil next: 3098b3b4aa74SDavid Sterba btrfs_release_path(path); 3099ae01a0abSYan Zheng key.offset++; 3100ae01a0abSYan Zheng } 3101f46b5a66SChristoph Hellwig ret = 0; 310232b7c687SMark Fasheh 3103f46b5a66SChristoph Hellwig out: 3104b3b4aa74SDavid Sterba btrfs_release_path(path); 310532b7c687SMark Fasheh btrfs_free_path(path); 310632b7c687SMark Fasheh vfree(buf); 310732b7c687SMark Fasheh return ret; 310832b7c687SMark Fasheh } 310932b7c687SMark Fasheh 311032b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 311132b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 311232b7c687SMark Fasheh { 311332b7c687SMark Fasheh struct inode *inode = fdentry(file)->d_inode; 311432b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 311532b7c687SMark Fasheh struct fd src_file; 311632b7c687SMark Fasheh struct inode *src; 311732b7c687SMark Fasheh int ret; 311832b7c687SMark Fasheh u64 len = olen; 311932b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 312032b7c687SMark Fasheh int same_inode = 0; 312132b7c687SMark Fasheh 312232b7c687SMark Fasheh /* 312332b7c687SMark Fasheh * TODO: 312432b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 312532b7c687SMark Fasheh * decompress into destination's address_space (the file offset 312632b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 312732b7c687SMark Fasheh * otherwise reinsert) a subrange. 312832b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 312932b7c687SMark Fasheh * they don't overlap)? 313032b7c687SMark Fasheh */ 313132b7c687SMark Fasheh 313232b7c687SMark Fasheh /* the destination must be opened for writing */ 313332b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 313432b7c687SMark Fasheh return -EINVAL; 313532b7c687SMark Fasheh 313632b7c687SMark Fasheh if (btrfs_root_readonly(root)) 313732b7c687SMark Fasheh return -EROFS; 313832b7c687SMark Fasheh 313932b7c687SMark Fasheh ret = mnt_want_write_file(file); 314032b7c687SMark Fasheh if (ret) 314132b7c687SMark Fasheh return ret; 314232b7c687SMark Fasheh 314332b7c687SMark Fasheh src_file = fdget(srcfd); 314432b7c687SMark Fasheh if (!src_file.file) { 314532b7c687SMark Fasheh ret = -EBADF; 314632b7c687SMark Fasheh goto out_drop_write; 314732b7c687SMark Fasheh } 314832b7c687SMark Fasheh 314932b7c687SMark Fasheh ret = -EXDEV; 315032b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 315132b7c687SMark Fasheh goto out_fput; 315232b7c687SMark Fasheh 315332b7c687SMark Fasheh src = file_inode(src_file.file); 315432b7c687SMark Fasheh 315532b7c687SMark Fasheh ret = -EINVAL; 315632b7c687SMark Fasheh if (src == inode) 315732b7c687SMark Fasheh same_inode = 1; 315832b7c687SMark Fasheh 315932b7c687SMark Fasheh /* the src must be open for reading */ 316032b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 316132b7c687SMark Fasheh goto out_fput; 316232b7c687SMark Fasheh 316332b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 316432b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 316532b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 316632b7c687SMark Fasheh goto out_fput; 316732b7c687SMark Fasheh 316832b7c687SMark Fasheh ret = -EISDIR; 316932b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 317032b7c687SMark Fasheh goto out_fput; 317132b7c687SMark Fasheh 317232b7c687SMark Fasheh ret = -EXDEV; 317332b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 317432b7c687SMark Fasheh goto out_fput; 317532b7c687SMark Fasheh 317632b7c687SMark Fasheh if (!same_inode) { 317732b7c687SMark Fasheh if (inode < src) { 317832b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 317932b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 318032b7c687SMark Fasheh } else { 318132b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 318232b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 318332b7c687SMark Fasheh } 318432b7c687SMark Fasheh } else { 318532b7c687SMark Fasheh mutex_lock(&src->i_mutex); 318632b7c687SMark Fasheh } 318732b7c687SMark Fasheh 318832b7c687SMark Fasheh /* determine range to clone */ 318932b7c687SMark Fasheh ret = -EINVAL; 319032b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 319132b7c687SMark Fasheh goto out_unlock; 319232b7c687SMark Fasheh if (len == 0) 319332b7c687SMark Fasheh olen = len = src->i_size - off; 319432b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 319532b7c687SMark Fasheh if (off + len == src->i_size) 319632b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 319732b7c687SMark Fasheh 319832b7c687SMark Fasheh /* verify the end result is block aligned */ 319932b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 320032b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 320132b7c687SMark Fasheh goto out_unlock; 320232b7c687SMark Fasheh 320332b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 320432b7c687SMark Fasheh if (same_inode) { 320532b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 320632b7c687SMark Fasheh goto out_unlock; 320732b7c687SMark Fasheh } 320832b7c687SMark Fasheh 320932b7c687SMark Fasheh if (destoff > inode->i_size) { 321032b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 321132b7c687SMark Fasheh if (ret) 321232b7c687SMark Fasheh goto out_unlock; 321332b7c687SMark Fasheh } 321432b7c687SMark Fasheh 321532b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 321632b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 321732b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 321832b7c687SMark Fasheh 321932b7c687SMark Fasheh lock_extent_range(src, off, len); 322032b7c687SMark Fasheh 322132b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 322232b7c687SMark Fasheh 3223aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3224f46b5a66SChristoph Hellwig out_unlock: 3225f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3226a96fbc72SLiu Bo if (!same_inode) 3227f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3228f46b5a66SChristoph Hellwig out_fput: 32292903ff01SAl Viro fdput(src_file); 3230ab67b7c1SYan Zheng out_drop_write: 32312a79f17eSAl Viro mnt_drop_write_file(file); 3232f46b5a66SChristoph Hellwig return ret; 3233f46b5a66SChristoph Hellwig } 3234f46b5a66SChristoph Hellwig 32357a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3236c5c9cd4dSSage Weil { 3237c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3238c5c9cd4dSSage Weil 32397a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3240c5c9cd4dSSage Weil return -EFAULT; 3241c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3242c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3243c5c9cd4dSSage Weil } 3244c5c9cd4dSSage Weil 3245f46b5a66SChristoph Hellwig /* 3246f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3247f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3248f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3249f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3250f46b5a66SChristoph Hellwig */ 3251b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3252f46b5a66SChristoph Hellwig { 3253496ad9aaSAl Viro struct inode *inode = file_inode(file); 3254f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3255f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 32561ab86aedSSage Weil int ret; 3257f46b5a66SChristoph Hellwig 32581ab86aedSSage Weil ret = -EPERM; 3259df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3260f46b5a66SChristoph Hellwig goto out; 32611ab86aedSSage Weil 32621ab86aedSSage Weil ret = -EINPROGRESS; 32631ab86aedSSage Weil if (file->private_data) 32641ab86aedSSage Weil goto out; 32659ca9ee09SSage Weil 3266b83cc969SLi Zefan ret = -EROFS; 3267b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3268b83cc969SLi Zefan goto out; 3269b83cc969SLi Zefan 3270a561be71SAl Viro ret = mnt_want_write_file(file); 3271c146afadSYan Zheng if (ret) 3272c146afadSYan Zheng goto out; 3273c146afadSYan Zheng 3274a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 32759ca9ee09SSage Weil 3276f46b5a66SChristoph Hellwig ret = -ENOMEM; 32777a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3278abd30bb0STsutomu Itoh if (IS_ERR(trans)) 32791ab86aedSSage Weil goto out_drop; 32801ab86aedSSage Weil 32811ab86aedSSage Weil file->private_data = trans; 32821ab86aedSSage Weil return 0; 32831ab86aedSSage Weil 32841ab86aedSSage Weil out_drop: 3285a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 32862a79f17eSAl Viro mnt_drop_write_file(file); 3287f46b5a66SChristoph Hellwig out: 3288f46b5a66SChristoph Hellwig return ret; 3289f46b5a66SChristoph Hellwig } 3290f46b5a66SChristoph Hellwig 32916ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32926ef5ed0dSJosef Bacik { 3293496ad9aaSAl Viro struct inode *inode = file_inode(file); 32946ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32956ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32966ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32976ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32986ef5ed0dSJosef Bacik struct btrfs_path *path; 32996ef5ed0dSJosef Bacik struct btrfs_key location; 33006ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33016ef5ed0dSJosef Bacik u64 objectid = 0; 33026ef5ed0dSJosef Bacik u64 dir_id; 33033c04ce01SMiao Xie int ret; 33046ef5ed0dSJosef Bacik 33056ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33066ef5ed0dSJosef Bacik return -EPERM; 33076ef5ed0dSJosef Bacik 33083c04ce01SMiao Xie ret = mnt_want_write_file(file); 33093c04ce01SMiao Xie if (ret) 33103c04ce01SMiao Xie return ret; 33113c04ce01SMiao Xie 33123c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33133c04ce01SMiao Xie ret = -EFAULT; 33143c04ce01SMiao Xie goto out; 33153c04ce01SMiao Xie } 33166ef5ed0dSJosef Bacik 33176ef5ed0dSJosef Bacik if (!objectid) 33186ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 33196ef5ed0dSJosef Bacik 33206ef5ed0dSJosef Bacik location.objectid = objectid; 33216ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33226ef5ed0dSJosef Bacik location.offset = (u64)-1; 33236ef5ed0dSJosef Bacik 33246ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 33253c04ce01SMiao Xie if (IS_ERR(new_root)) { 33263c04ce01SMiao Xie ret = PTR_ERR(new_root); 33273c04ce01SMiao Xie goto out; 33283c04ce01SMiao Xie } 33296ef5ed0dSJosef Bacik 33306ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33313c04ce01SMiao Xie if (!path) { 33323c04ce01SMiao Xie ret = -ENOMEM; 33333c04ce01SMiao Xie goto out; 33343c04ce01SMiao Xie } 33356ef5ed0dSJosef Bacik path->leave_spinning = 1; 33366ef5ed0dSJosef Bacik 33376ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 333898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33396ef5ed0dSJosef Bacik btrfs_free_path(path); 33403c04ce01SMiao Xie ret = PTR_ERR(trans); 33413c04ce01SMiao Xie goto out; 33426ef5ed0dSJosef Bacik } 33436ef5ed0dSJosef Bacik 33446c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 33456ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 33466ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3347cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33486ef5ed0dSJosef Bacik btrfs_free_path(path); 33496ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33506ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 33516ef5ed0dSJosef Bacik "this isn't going to work\n"); 33523c04ce01SMiao Xie ret = -ENOENT; 33533c04ce01SMiao Xie goto out; 33546ef5ed0dSJosef Bacik } 33556ef5ed0dSJosef Bacik 33566ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33576ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33586ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33596ef5ed0dSJosef Bacik btrfs_free_path(path); 33606ef5ed0dSJosef Bacik 33612b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 33626ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33633c04ce01SMiao Xie out: 33643c04ce01SMiao Xie mnt_drop_write_file(file); 33653c04ce01SMiao Xie return ret; 33666ef5ed0dSJosef Bacik } 33676ef5ed0dSJosef Bacik 33685af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3369bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3370bf5fc093SJosef Bacik { 3371bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3372bf5fc093SJosef Bacik 3373bf5fc093SJosef Bacik space->total_bytes = 0; 3374bf5fc093SJosef Bacik space->used_bytes = 0; 3375bf5fc093SJosef Bacik space->flags = 0; 3376bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3377bf5fc093SJosef Bacik space->flags = block_group->flags; 3378bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3379bf5fc093SJosef Bacik space->used_bytes += 3380bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3381bf5fc093SJosef Bacik } 3382bf5fc093SJosef Bacik } 3383bf5fc093SJosef Bacik 338448a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 33851406e432SJosef Bacik { 33861406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33871406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33881406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33897fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 339013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33911406e432SJosef Bacik struct btrfs_space_info *info; 3392bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3393bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3394bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3395bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3396bf5fc093SJosef Bacik int num_types = 4; 33977fde62bfSChris Mason int alloc_size; 33981406e432SJosef Bacik int ret = 0; 339951788b1bSDan Rosenberg u64 slot_count = 0; 3400bf5fc093SJosef Bacik int i, c; 34011406e432SJosef Bacik 34021406e432SJosef Bacik if (copy_from_user(&space_args, 34031406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34041406e432SJosef Bacik sizeof(space_args))) 34051406e432SJosef Bacik return -EFAULT; 34061406e432SJosef Bacik 3407bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3408bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3409bf5fc093SJosef Bacik 3410bf5fc093SJosef Bacik info = NULL; 34117fde62bfSChris Mason rcu_read_lock(); 3412bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3413bf5fc093SJosef Bacik list) { 3414bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3415bf5fc093SJosef Bacik info = tmp; 3416bf5fc093SJosef Bacik break; 3417bf5fc093SJosef Bacik } 3418bf5fc093SJosef Bacik } 34197fde62bfSChris Mason rcu_read_unlock(); 34201406e432SJosef Bacik 3421bf5fc093SJosef Bacik if (!info) 3422bf5fc093SJosef Bacik continue; 3423bf5fc093SJosef Bacik 3424bf5fc093SJosef Bacik down_read(&info->groups_sem); 3425bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3426bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3427bf5fc093SJosef Bacik slot_count++; 3428bf5fc093SJosef Bacik } 3429bf5fc093SJosef Bacik up_read(&info->groups_sem); 3430bf5fc093SJosef Bacik } 3431bf5fc093SJosef Bacik 34327fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34337fde62bfSChris Mason if (space_args.space_slots == 0) { 34347fde62bfSChris Mason space_args.total_spaces = slot_count; 34357fde62bfSChris Mason goto out; 34367fde62bfSChris Mason } 3437bf5fc093SJosef Bacik 343851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3439bf5fc093SJosef Bacik 34407fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3441bf5fc093SJosef Bacik 34427fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34437fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34447fde62bfSChris Mason */ 34457fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 34467fde62bfSChris Mason return -ENOMEM; 34477fde62bfSChris Mason 34487fde62bfSChris Mason space_args.total_spaces = 0; 34497fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 34507fde62bfSChris Mason if (!dest) 34517fde62bfSChris Mason return -ENOMEM; 34527fde62bfSChris Mason dest_orig = dest; 34537fde62bfSChris Mason 34547fde62bfSChris Mason /* now we have a buffer to copy into */ 3455bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3456bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3457bf5fc093SJosef Bacik 345851788b1bSDan Rosenberg if (!slot_count) 345951788b1bSDan Rosenberg break; 346051788b1bSDan Rosenberg 3461bf5fc093SJosef Bacik info = NULL; 34621406e432SJosef Bacik rcu_read_lock(); 3463bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3464bf5fc093SJosef Bacik list) { 3465bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3466bf5fc093SJosef Bacik info = tmp; 34677fde62bfSChris Mason break; 3468bf5fc093SJosef Bacik } 3469bf5fc093SJosef Bacik } 3470bf5fc093SJosef Bacik rcu_read_unlock(); 34717fde62bfSChris Mason 3472bf5fc093SJosef Bacik if (!info) 3473bf5fc093SJosef Bacik continue; 3474bf5fc093SJosef Bacik down_read(&info->groups_sem); 3475bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3476bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 34775af3e8ccSStefan Behrens btrfs_get_block_group_info( 34785af3e8ccSStefan Behrens &info->block_groups[c], &space); 34797fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34801406e432SJosef Bacik dest++; 34811406e432SJosef Bacik space_args.total_spaces++; 348251788b1bSDan Rosenberg slot_count--; 34831406e432SJosef Bacik } 348451788b1bSDan Rosenberg if (!slot_count) 348551788b1bSDan Rosenberg break; 3486bf5fc093SJosef Bacik } 3487bf5fc093SJosef Bacik up_read(&info->groups_sem); 3488bf5fc093SJosef Bacik } 34891406e432SJosef Bacik 34902eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 34917fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 34927fde62bfSChris Mason 34937fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 34947fde62bfSChris Mason ret = -EFAULT; 34957fde62bfSChris Mason 34967fde62bfSChris Mason kfree(dest_orig); 34977fde62bfSChris Mason out: 34987fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 34991406e432SJosef Bacik ret = -EFAULT; 35001406e432SJosef Bacik 35011406e432SJosef Bacik return ret; 35021406e432SJosef Bacik } 35031406e432SJosef Bacik 3504f46b5a66SChristoph Hellwig /* 3505f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3506f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3507f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3508f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3509f46b5a66SChristoph Hellwig */ 3510f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3511f46b5a66SChristoph Hellwig { 3512496ad9aaSAl Viro struct inode *inode = file_inode(file); 3513f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3514f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3515f46b5a66SChristoph Hellwig 3516f46b5a66SChristoph Hellwig trans = file->private_data; 35171ab86aedSSage Weil if (!trans) 35181ab86aedSSage Weil return -EINVAL; 3519b214107eSChristoph Hellwig file->private_data = NULL; 35209ca9ee09SSage Weil 35211ab86aedSSage Weil btrfs_end_transaction(trans, root); 35221ab86aedSSage Weil 3523a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 35249ca9ee09SSage Weil 35252a79f17eSAl Viro mnt_drop_write_file(file); 35261ab86aedSSage Weil return 0; 3527f46b5a66SChristoph Hellwig } 3528f46b5a66SChristoph Hellwig 35299a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35309a8c28beSMiao Xie void __user *argp) 353146204592SSage Weil { 353246204592SSage Weil struct btrfs_trans_handle *trans; 353346204592SSage Weil u64 transid; 3534db5b493aSTsutomu Itoh int ret; 353546204592SSage Weil 3536d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3537ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3538ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 353998d5dc13STsutomu Itoh return PTR_ERR(trans); 3540ff7c1d33SMiao Xie 3541ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3542ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3543ff7c1d33SMiao Xie goto out; 3544ff7c1d33SMiao Xie } 354546204592SSage Weil transid = trans->transid; 3546db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 35478b2b2d3cSTsutomu Itoh if (ret) { 35488b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3549db5b493aSTsutomu Itoh return ret; 35508b2b2d3cSTsutomu Itoh } 3551ff7c1d33SMiao Xie out: 355246204592SSage Weil if (argp) 355346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 355446204592SSage Weil return -EFAULT; 355546204592SSage Weil return 0; 355646204592SSage Weil } 355746204592SSage Weil 35589a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 35599a8c28beSMiao Xie void __user *argp) 356046204592SSage Weil { 356146204592SSage Weil u64 transid; 356246204592SSage Weil 356346204592SSage Weil if (argp) { 356446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 356546204592SSage Weil return -EFAULT; 356646204592SSage Weil } else { 356746204592SSage Weil transid = 0; /* current trans */ 356846204592SSage Weil } 356946204592SSage Weil return btrfs_wait_for_commit(root, transid); 357046204592SSage Weil } 357146204592SSage Weil 3572b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3573475f6387SJan Schmidt { 3574496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3575475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3576b8e95489SMiao Xie int ret; 3577475f6387SJan Schmidt 3578475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3579475f6387SJan Schmidt return -EPERM; 3580475f6387SJan Schmidt 3581475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3582475f6387SJan Schmidt if (IS_ERR(sa)) 3583475f6387SJan Schmidt return PTR_ERR(sa); 3584475f6387SJan Schmidt 3585b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3586b8e95489SMiao Xie ret = mnt_want_write_file(file); 3587b8e95489SMiao Xie if (ret) 3588b8e95489SMiao Xie goto out; 3589b8e95489SMiao Xie } 3590b8e95489SMiao Xie 3591aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 359263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 359363a212abSStefan Behrens 0); 3594475f6387SJan Schmidt 3595475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3596475f6387SJan Schmidt ret = -EFAULT; 3597475f6387SJan Schmidt 3598b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3599b8e95489SMiao Xie mnt_drop_write_file(file); 3600b8e95489SMiao Xie out: 3601475f6387SJan Schmidt kfree(sa); 3602475f6387SJan Schmidt return ret; 3603475f6387SJan Schmidt } 3604475f6387SJan Schmidt 3605475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3606475f6387SJan Schmidt { 3607475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3608475f6387SJan Schmidt return -EPERM; 3609475f6387SJan Schmidt 3610aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3611475f6387SJan Schmidt } 3612475f6387SJan Schmidt 3613475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3614475f6387SJan Schmidt void __user *arg) 3615475f6387SJan Schmidt { 3616475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3617475f6387SJan Schmidt int ret; 3618475f6387SJan Schmidt 3619475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3620475f6387SJan Schmidt return -EPERM; 3621475f6387SJan Schmidt 3622475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3623475f6387SJan Schmidt if (IS_ERR(sa)) 3624475f6387SJan Schmidt return PTR_ERR(sa); 3625475f6387SJan Schmidt 3626475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3627475f6387SJan Schmidt 3628475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3629475f6387SJan Schmidt ret = -EFAULT; 3630475f6387SJan Schmidt 3631475f6387SJan Schmidt kfree(sa); 3632475f6387SJan Schmidt return ret; 3633475f6387SJan Schmidt } 3634475f6387SJan Schmidt 3635c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3636b27f7c0cSDavid Sterba void __user *arg) 3637c11d2c23SStefan Behrens { 3638c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3639c11d2c23SStefan Behrens int ret; 3640c11d2c23SStefan Behrens 3641c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3642c11d2c23SStefan Behrens if (IS_ERR(sa)) 3643c11d2c23SStefan Behrens return PTR_ERR(sa); 3644c11d2c23SStefan Behrens 3645b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3646b27f7c0cSDavid Sterba kfree(sa); 3647b27f7c0cSDavid Sterba return -EPERM; 3648b27f7c0cSDavid Sterba } 3649b27f7c0cSDavid Sterba 3650b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3651c11d2c23SStefan Behrens 3652c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3653c11d2c23SStefan Behrens ret = -EFAULT; 3654c11d2c23SStefan Behrens 3655c11d2c23SStefan Behrens kfree(sa); 3656c11d2c23SStefan Behrens return ret; 3657c11d2c23SStefan Behrens } 3658c11d2c23SStefan Behrens 36593f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 36603f6bcfbdSStefan Behrens { 36613f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36623f6bcfbdSStefan Behrens int ret; 36633f6bcfbdSStefan Behrens 36643f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36653f6bcfbdSStefan Behrens return -EPERM; 36663f6bcfbdSStefan Behrens 36673f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36683f6bcfbdSStefan Behrens if (IS_ERR(p)) 36693f6bcfbdSStefan Behrens return PTR_ERR(p); 36703f6bcfbdSStefan Behrens 36713f6bcfbdSStefan Behrens switch (p->cmd) { 36723f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 36733f6bcfbdSStefan Behrens if (atomic_xchg( 36743f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36753f6bcfbdSStefan Behrens 1)) { 36763f6bcfbdSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 36773f6bcfbdSStefan Behrens ret = -EINPROGRESS; 36783f6bcfbdSStefan Behrens } else { 36793f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 36803f6bcfbdSStefan Behrens atomic_set( 36813f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36823f6bcfbdSStefan Behrens 0); 36833f6bcfbdSStefan Behrens } 36843f6bcfbdSStefan Behrens break; 36853f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36863f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 36873f6bcfbdSStefan Behrens ret = 0; 36883f6bcfbdSStefan Behrens break; 36893f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 36903f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 36913f6bcfbdSStefan Behrens break; 36923f6bcfbdSStefan Behrens default: 36933f6bcfbdSStefan Behrens ret = -EINVAL; 36943f6bcfbdSStefan Behrens break; 36953f6bcfbdSStefan Behrens } 36963f6bcfbdSStefan Behrens 36973f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 36983f6bcfbdSStefan Behrens ret = -EFAULT; 36993f6bcfbdSStefan Behrens 37003f6bcfbdSStefan Behrens kfree(p); 37013f6bcfbdSStefan Behrens return ret; 37023f6bcfbdSStefan Behrens } 37033f6bcfbdSStefan Behrens 3704d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3705d7728c96SJan Schmidt { 3706d7728c96SJan Schmidt int ret = 0; 3707d7728c96SJan Schmidt int i; 3708740c3d22SChris Mason u64 rel_ptr; 3709d7728c96SJan Schmidt int size; 3710806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3711d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3712d7728c96SJan Schmidt struct btrfs_path *path; 3713d7728c96SJan Schmidt 371482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3715d7728c96SJan Schmidt return -EPERM; 3716d7728c96SJan Schmidt 3717d7728c96SJan Schmidt path = btrfs_alloc_path(); 3718d7728c96SJan Schmidt if (!path) { 3719d7728c96SJan Schmidt ret = -ENOMEM; 3720d7728c96SJan Schmidt goto out; 3721d7728c96SJan Schmidt } 3722d7728c96SJan Schmidt 3723d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3724d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3725d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3726d7728c96SJan Schmidt ipa = NULL; 3727d7728c96SJan Schmidt goto out; 3728d7728c96SJan Schmidt } 3729d7728c96SJan Schmidt 3730d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3731d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3732d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3733d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3734d7728c96SJan Schmidt ipath = NULL; 3735d7728c96SJan Schmidt goto out; 3736d7728c96SJan Schmidt } 3737d7728c96SJan Schmidt 3738d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3739d7728c96SJan Schmidt if (ret < 0) 3740d7728c96SJan Schmidt goto out; 3741d7728c96SJan Schmidt 3742d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3743745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3744745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3745740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3746d7728c96SJan Schmidt } 3747d7728c96SJan Schmidt 3748745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3749745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3750d7728c96SJan Schmidt if (ret) { 3751d7728c96SJan Schmidt ret = -EFAULT; 3752d7728c96SJan Schmidt goto out; 3753d7728c96SJan Schmidt } 3754d7728c96SJan Schmidt 3755d7728c96SJan Schmidt out: 3756d7728c96SJan Schmidt btrfs_free_path(path); 3757d7728c96SJan Schmidt free_ipath(ipath); 3758d7728c96SJan Schmidt kfree(ipa); 3759d7728c96SJan Schmidt 3760d7728c96SJan Schmidt return ret; 3761d7728c96SJan Schmidt } 3762d7728c96SJan Schmidt 3763d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3764d7728c96SJan Schmidt { 3765d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3766d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3767d7728c96SJan Schmidt 3768d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3769d7728c96SJan Schmidt inodes->bytes_left -= c; 3770d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3771d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3772d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3773d7728c96SJan Schmidt inodes->elem_cnt += 3; 3774d7728c96SJan Schmidt } else { 3775d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3776d7728c96SJan Schmidt inodes->bytes_left = 0; 3777d7728c96SJan Schmidt inodes->elem_missed += 3; 3778d7728c96SJan Schmidt } 3779d7728c96SJan Schmidt 3780d7728c96SJan Schmidt return 0; 3781d7728c96SJan Schmidt } 3782d7728c96SJan Schmidt 3783d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3784d7728c96SJan Schmidt void __user *arg) 3785d7728c96SJan Schmidt { 3786d7728c96SJan Schmidt int ret = 0; 3787d7728c96SJan Schmidt int size; 3788d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3789d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3790d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3791d7728c96SJan Schmidt 3792d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3793d7728c96SJan Schmidt return -EPERM; 3794d7728c96SJan Schmidt 3795d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3796d7728c96SJan Schmidt if (IS_ERR(loi)) { 3797d7728c96SJan Schmidt ret = PTR_ERR(loi); 3798d7728c96SJan Schmidt loi = NULL; 3799d7728c96SJan Schmidt goto out; 3800d7728c96SJan Schmidt } 3801d7728c96SJan Schmidt 3802d7728c96SJan Schmidt path = btrfs_alloc_path(); 3803d7728c96SJan Schmidt if (!path) { 3804d7728c96SJan Schmidt ret = -ENOMEM; 3805d7728c96SJan Schmidt goto out; 3806d7728c96SJan Schmidt } 3807d7728c96SJan Schmidt 3808425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3809d7728c96SJan Schmidt inodes = init_data_container(size); 3810d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3811d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3812d7728c96SJan Schmidt inodes = NULL; 3813d7728c96SJan Schmidt goto out; 3814d7728c96SJan Schmidt } 3815d7728c96SJan Schmidt 3816df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3817df031f07SLiu Bo build_ino_list, inodes); 3818df031f07SLiu Bo if (ret == -EINVAL) 3819d7728c96SJan Schmidt ret = -ENOENT; 3820d7728c96SJan Schmidt if (ret < 0) 3821d7728c96SJan Schmidt goto out; 3822d7728c96SJan Schmidt 3823745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3824745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3825d7728c96SJan Schmidt if (ret) 3826d7728c96SJan Schmidt ret = -EFAULT; 3827d7728c96SJan Schmidt 3828d7728c96SJan Schmidt out: 3829d7728c96SJan Schmidt btrfs_free_path(path); 3830425d17a2SLiu Bo vfree(inodes); 3831d7728c96SJan Schmidt kfree(loi); 3832d7728c96SJan Schmidt 3833d7728c96SJan Schmidt return ret; 3834d7728c96SJan Schmidt } 3835d7728c96SJan Schmidt 383619a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3837c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3838c9e9f97bSIlya Dryomov { 3839c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3840c9e9f97bSIlya Dryomov 3841c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3842c9e9f97bSIlya Dryomov 3843837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3844837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3845837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3846837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3847a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3848a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3849837d5b6eSIlya Dryomov 3850c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3851c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3852c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 385319a39dceSIlya Dryomov 385419a39dceSIlya Dryomov if (lock) { 385519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 385619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 385819a39dceSIlya Dryomov } else { 385919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 386019a39dceSIlya Dryomov } 3861c9e9f97bSIlya Dryomov } 3862c9e9f97bSIlya Dryomov 38639ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3864c9e9f97bSIlya Dryomov { 3865496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3866c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3867c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3868c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3869ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3870c9e9f97bSIlya Dryomov int ret; 3871c9e9f97bSIlya Dryomov 3872c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3873c9e9f97bSIlya Dryomov return -EPERM; 3874c9e9f97bSIlya Dryomov 3875e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38769ba1f6e4SLiu Bo if (ret) 38779ba1f6e4SLiu Bo return ret; 38789ba1f6e4SLiu Bo 3879ed0fb78fSIlya Dryomov again: 3880ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3881c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3882c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3883ed0fb78fSIlya Dryomov need_unlock = true; 3884ed0fb78fSIlya Dryomov goto locked; 3885ed0fb78fSIlya Dryomov } 3886ed0fb78fSIlya Dryomov 3887ed0fb78fSIlya Dryomov /* 3888ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3889ed0fb78fSIlya Dryomov * (1) some other op is running 3890ed0fb78fSIlya Dryomov * (2) balance is running 3891ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3892ed0fb78fSIlya Dryomov */ 3893ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3894ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3895ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3896ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3897ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3898ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3899ed0fb78fSIlya Dryomov goto again; 3900ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3901ed0fb78fSIlya Dryomov 3902ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3903ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3904ed0fb78fSIlya Dryomov /* this is (3) */ 3905ed0fb78fSIlya Dryomov need_unlock = false; 3906ed0fb78fSIlya Dryomov goto locked; 3907ed0fb78fSIlya Dryomov } 3908ed0fb78fSIlya Dryomov 3909ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3910ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3911ed0fb78fSIlya Dryomov goto again; 3912ed0fb78fSIlya Dryomov } else { 3913ed0fb78fSIlya Dryomov /* this is (2) */ 3914ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3915ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3916ed0fb78fSIlya Dryomov goto out; 3917ed0fb78fSIlya Dryomov } 3918ed0fb78fSIlya Dryomov } else { 3919ed0fb78fSIlya Dryomov /* this is (1) */ 3920ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3921ed0fb78fSIlya Dryomov pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 3922ed0fb78fSIlya Dryomov ret = -EINVAL; 3923ed0fb78fSIlya Dryomov goto out; 3924ed0fb78fSIlya Dryomov } 3925ed0fb78fSIlya Dryomov 3926ed0fb78fSIlya Dryomov locked: 3927ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3928c9e9f97bSIlya Dryomov 3929c9e9f97bSIlya Dryomov if (arg) { 3930c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3931c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3932c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3933ed0fb78fSIlya Dryomov goto out_unlock; 3934c9e9f97bSIlya Dryomov } 3935de322263SIlya Dryomov 3936de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3937de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3938de322263SIlya Dryomov ret = -ENOTCONN; 3939de322263SIlya Dryomov goto out_bargs; 3940de322263SIlya Dryomov } 3941de322263SIlya Dryomov 3942de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3943de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3944de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3945de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3946de322263SIlya Dryomov 3947de322263SIlya Dryomov goto do_balance; 3948de322263SIlya Dryomov } 3949c9e9f97bSIlya Dryomov } else { 3950c9e9f97bSIlya Dryomov bargs = NULL; 3951c9e9f97bSIlya Dryomov } 3952c9e9f97bSIlya Dryomov 3953ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3954837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3955837d5b6eSIlya Dryomov goto out_bargs; 3956837d5b6eSIlya Dryomov } 3957837d5b6eSIlya Dryomov 3958c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3959c9e9f97bSIlya Dryomov if (!bctl) { 3960c9e9f97bSIlya Dryomov ret = -ENOMEM; 3961c9e9f97bSIlya Dryomov goto out_bargs; 3962c9e9f97bSIlya Dryomov } 3963c9e9f97bSIlya Dryomov 3964c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3965c9e9f97bSIlya Dryomov if (arg) { 3966c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3967c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3968c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3969c9e9f97bSIlya Dryomov 3970c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3971f43ffb60SIlya Dryomov } else { 3972f43ffb60SIlya Dryomov /* balance everything - no filters */ 3973f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3974c9e9f97bSIlya Dryomov } 3975c9e9f97bSIlya Dryomov 3976de322263SIlya Dryomov do_balance: 3977c9e9f97bSIlya Dryomov /* 3978ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3979ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3980ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3981ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3982ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3983c9e9f97bSIlya Dryomov */ 3984ed0fb78fSIlya Dryomov need_unlock = false; 3985ed0fb78fSIlya Dryomov 3986ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3987ed0fb78fSIlya Dryomov 3988c9e9f97bSIlya Dryomov if (arg) { 3989c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3990c9e9f97bSIlya Dryomov ret = -EFAULT; 3991c9e9f97bSIlya Dryomov } 3992c9e9f97bSIlya Dryomov 3993c9e9f97bSIlya Dryomov out_bargs: 3994c9e9f97bSIlya Dryomov kfree(bargs); 3995ed0fb78fSIlya Dryomov out_unlock: 3996c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3997c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3998ed0fb78fSIlya Dryomov if (need_unlock) 3999ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4000ed0fb78fSIlya Dryomov out: 4001e54bfa31SLiu Bo mnt_drop_write_file(file); 4002c9e9f97bSIlya Dryomov return ret; 4003c9e9f97bSIlya Dryomov } 4004c9e9f97bSIlya Dryomov 4005837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4006837d5b6eSIlya Dryomov { 4007837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4008837d5b6eSIlya Dryomov return -EPERM; 4009837d5b6eSIlya Dryomov 4010837d5b6eSIlya Dryomov switch (cmd) { 4011837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4012837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4013a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4014a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4015837d5b6eSIlya Dryomov } 4016837d5b6eSIlya Dryomov 4017837d5b6eSIlya Dryomov return -EINVAL; 4018837d5b6eSIlya Dryomov } 4019837d5b6eSIlya Dryomov 402019a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 402119a39dceSIlya Dryomov void __user *arg) 402219a39dceSIlya Dryomov { 402319a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 402419a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 402519a39dceSIlya Dryomov int ret = 0; 402619a39dceSIlya Dryomov 402719a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 402819a39dceSIlya Dryomov return -EPERM; 402919a39dceSIlya Dryomov 403019a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 403119a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 403219a39dceSIlya Dryomov ret = -ENOTCONN; 403319a39dceSIlya Dryomov goto out; 403419a39dceSIlya Dryomov } 403519a39dceSIlya Dryomov 403619a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 403719a39dceSIlya Dryomov if (!bargs) { 403819a39dceSIlya Dryomov ret = -ENOMEM; 403919a39dceSIlya Dryomov goto out; 404019a39dceSIlya Dryomov } 404119a39dceSIlya Dryomov 404219a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 404319a39dceSIlya Dryomov 404419a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 404519a39dceSIlya Dryomov ret = -EFAULT; 404619a39dceSIlya Dryomov 404719a39dceSIlya Dryomov kfree(bargs); 404819a39dceSIlya Dryomov out: 404919a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 405019a39dceSIlya Dryomov return ret; 405119a39dceSIlya Dryomov } 405219a39dceSIlya Dryomov 4053905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40545d13a37bSArne Jansen { 4055496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40565d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40575d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 40585d13a37bSArne Jansen int ret; 40595d13a37bSArne Jansen int err; 40605d13a37bSArne Jansen 40615d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40625d13a37bSArne Jansen return -EPERM; 40635d13a37bSArne Jansen 4064905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4065905b0ddaSMiao Xie if (ret) 4066905b0ddaSMiao Xie return ret; 40675d13a37bSArne Jansen 40685d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4069905b0ddaSMiao Xie if (IS_ERR(sa)) { 4070905b0ddaSMiao Xie ret = PTR_ERR(sa); 4071905b0ddaSMiao Xie goto drop_write; 4072905b0ddaSMiao Xie } 40735d13a37bSArne Jansen 40747708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 407592f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 40765d13a37bSArne Jansen if (IS_ERR(trans)) { 40775d13a37bSArne Jansen ret = PTR_ERR(trans); 40785d13a37bSArne Jansen goto out; 40795d13a37bSArne Jansen } 40805d13a37bSArne Jansen 40815d13a37bSArne Jansen switch (sa->cmd) { 40825d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 40835d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 40845d13a37bSArne Jansen break; 40855d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 40865d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 40875d13a37bSArne Jansen break; 40885d13a37bSArne Jansen default: 40895d13a37bSArne Jansen ret = -EINVAL; 40905d13a37bSArne Jansen break; 40915d13a37bSArne Jansen } 40925d13a37bSArne Jansen 409392f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 40945d13a37bSArne Jansen if (err && !ret) 40955d13a37bSArne Jansen ret = err; 40965d13a37bSArne Jansen out: 40975d13a37bSArne Jansen kfree(sa); 40987708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4099905b0ddaSMiao Xie drop_write: 4100905b0ddaSMiao Xie mnt_drop_write_file(file); 41015d13a37bSArne Jansen return ret; 41025d13a37bSArne Jansen } 41035d13a37bSArne Jansen 4104905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41055d13a37bSArne Jansen { 4106496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41075d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41085d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41095d13a37bSArne Jansen int ret; 41105d13a37bSArne Jansen int err; 41115d13a37bSArne Jansen 41125d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41135d13a37bSArne Jansen return -EPERM; 41145d13a37bSArne Jansen 4115905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4116905b0ddaSMiao Xie if (ret) 4117905b0ddaSMiao Xie return ret; 41185d13a37bSArne Jansen 41195d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4120905b0ddaSMiao Xie if (IS_ERR(sa)) { 4121905b0ddaSMiao Xie ret = PTR_ERR(sa); 4122905b0ddaSMiao Xie goto drop_write; 4123905b0ddaSMiao Xie } 41245d13a37bSArne Jansen 41255d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41265d13a37bSArne Jansen if (IS_ERR(trans)) { 41275d13a37bSArne Jansen ret = PTR_ERR(trans); 41285d13a37bSArne Jansen goto out; 41295d13a37bSArne Jansen } 41305d13a37bSArne Jansen 41315d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41325d13a37bSArne Jansen if (sa->assign) { 41335d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 41345d13a37bSArne Jansen sa->src, sa->dst); 41355d13a37bSArne Jansen } else { 41365d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 41375d13a37bSArne Jansen sa->src, sa->dst); 41385d13a37bSArne Jansen } 41395d13a37bSArne Jansen 41405d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41415d13a37bSArne Jansen if (err && !ret) 41425d13a37bSArne Jansen ret = err; 41435d13a37bSArne Jansen 41445d13a37bSArne Jansen out: 41455d13a37bSArne Jansen kfree(sa); 4146905b0ddaSMiao Xie drop_write: 4147905b0ddaSMiao Xie mnt_drop_write_file(file); 41485d13a37bSArne Jansen return ret; 41495d13a37bSArne Jansen } 41505d13a37bSArne Jansen 4151905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41525d13a37bSArne Jansen { 4153496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41545d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41555d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41565d13a37bSArne Jansen int ret; 41575d13a37bSArne Jansen int err; 41585d13a37bSArne Jansen 41595d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41605d13a37bSArne Jansen return -EPERM; 41615d13a37bSArne Jansen 4162905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4163905b0ddaSMiao Xie if (ret) 4164905b0ddaSMiao Xie return ret; 41655d13a37bSArne Jansen 41665d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4167905b0ddaSMiao Xie if (IS_ERR(sa)) { 4168905b0ddaSMiao Xie ret = PTR_ERR(sa); 4169905b0ddaSMiao Xie goto drop_write; 4170905b0ddaSMiao Xie } 41715d13a37bSArne Jansen 4172d86e56cfSMiao Xie if (!sa->qgroupid) { 4173d86e56cfSMiao Xie ret = -EINVAL; 4174d86e56cfSMiao Xie goto out; 4175d86e56cfSMiao Xie } 4176d86e56cfSMiao Xie 41775d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41785d13a37bSArne Jansen if (IS_ERR(trans)) { 41795d13a37bSArne Jansen ret = PTR_ERR(trans); 41805d13a37bSArne Jansen goto out; 41815d13a37bSArne Jansen } 41825d13a37bSArne Jansen 41835d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41845d13a37bSArne Jansen if (sa->create) { 41855d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 41865d13a37bSArne Jansen NULL); 41875d13a37bSArne Jansen } else { 41885d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 41895d13a37bSArne Jansen } 41905d13a37bSArne Jansen 41915d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41925d13a37bSArne Jansen if (err && !ret) 41935d13a37bSArne Jansen ret = err; 41945d13a37bSArne Jansen 41955d13a37bSArne Jansen out: 41965d13a37bSArne Jansen kfree(sa); 4197905b0ddaSMiao Xie drop_write: 4198905b0ddaSMiao Xie mnt_drop_write_file(file); 41995d13a37bSArne Jansen return ret; 42005d13a37bSArne Jansen } 42015d13a37bSArne Jansen 4202905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42035d13a37bSArne Jansen { 4204496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42055d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42065d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42075d13a37bSArne Jansen int ret; 42085d13a37bSArne Jansen int err; 42095d13a37bSArne Jansen u64 qgroupid; 42105d13a37bSArne Jansen 42115d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42125d13a37bSArne Jansen return -EPERM; 42135d13a37bSArne Jansen 4214905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4215905b0ddaSMiao Xie if (ret) 4216905b0ddaSMiao Xie return ret; 42175d13a37bSArne Jansen 42185d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4219905b0ddaSMiao Xie if (IS_ERR(sa)) { 4220905b0ddaSMiao Xie ret = PTR_ERR(sa); 4221905b0ddaSMiao Xie goto drop_write; 4222905b0ddaSMiao Xie } 42235d13a37bSArne Jansen 42245d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42255d13a37bSArne Jansen if (IS_ERR(trans)) { 42265d13a37bSArne Jansen ret = PTR_ERR(trans); 42275d13a37bSArne Jansen goto out; 42285d13a37bSArne Jansen } 42295d13a37bSArne Jansen 42305d13a37bSArne Jansen qgroupid = sa->qgroupid; 42315d13a37bSArne Jansen if (!qgroupid) { 42325d13a37bSArne Jansen /* take the current subvol as qgroup */ 42335d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42345d13a37bSArne Jansen } 42355d13a37bSArne Jansen 42365d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42375d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 42385d13a37bSArne Jansen 42395d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42405d13a37bSArne Jansen if (err && !ret) 42415d13a37bSArne Jansen ret = err; 42425d13a37bSArne Jansen 42435d13a37bSArne Jansen out: 42445d13a37bSArne Jansen kfree(sa); 4245905b0ddaSMiao Xie drop_write: 4246905b0ddaSMiao Xie mnt_drop_write_file(file); 42475d13a37bSArne Jansen return ret; 42485d13a37bSArne Jansen } 42495d13a37bSArne Jansen 42502f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42512f232036SJan Schmidt { 42526d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42532f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42542f232036SJan Schmidt int ret; 42552f232036SJan Schmidt 42562f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42572f232036SJan Schmidt return -EPERM; 42582f232036SJan Schmidt 42592f232036SJan Schmidt ret = mnt_want_write_file(file); 42602f232036SJan Schmidt if (ret) 42612f232036SJan Schmidt return ret; 42622f232036SJan Schmidt 42632f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42642f232036SJan Schmidt if (IS_ERR(qsa)) { 42652f232036SJan Schmidt ret = PTR_ERR(qsa); 42662f232036SJan Schmidt goto drop_write; 42672f232036SJan Schmidt } 42682f232036SJan Schmidt 42692f232036SJan Schmidt if (qsa->flags) { 42702f232036SJan Schmidt ret = -EINVAL; 42712f232036SJan Schmidt goto out; 42722f232036SJan Schmidt } 42732f232036SJan Schmidt 42742f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 42752f232036SJan Schmidt 42762f232036SJan Schmidt out: 42772f232036SJan Schmidt kfree(qsa); 42782f232036SJan Schmidt drop_write: 42792f232036SJan Schmidt mnt_drop_write_file(file); 42802f232036SJan Schmidt return ret; 42812f232036SJan Schmidt } 42822f232036SJan Schmidt 42832f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 42842f232036SJan Schmidt { 42856d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42862f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42872f232036SJan Schmidt int ret = 0; 42882f232036SJan Schmidt 42892f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42902f232036SJan Schmidt return -EPERM; 42912f232036SJan Schmidt 42922f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 42932f232036SJan Schmidt if (!qsa) 42942f232036SJan Schmidt return -ENOMEM; 42952f232036SJan Schmidt 42962f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 42972f232036SJan Schmidt qsa->flags = 1; 42982f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 42992f232036SJan Schmidt } 43002f232036SJan Schmidt 43012f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43022f232036SJan Schmidt ret = -EFAULT; 43032f232036SJan Schmidt 43042f232036SJan Schmidt kfree(qsa); 43052f232036SJan Schmidt return ret; 43062f232036SJan Schmidt } 43072f232036SJan Schmidt 430857254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 430957254b6eSJan Schmidt { 431057254b6eSJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 431157254b6eSJan Schmidt 431257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 431357254b6eSJan Schmidt return -EPERM; 431457254b6eSJan Schmidt 431557254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 431657254b6eSJan Schmidt } 431757254b6eSJan Schmidt 43188ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 43198ea05e3aSAlexander Block void __user *arg) 43208ea05e3aSAlexander Block { 43218ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 4322496ad9aaSAl Viro struct inode *inode = file_inode(file); 43238ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43248ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43258ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 43268ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 43278ea05e3aSAlexander Block int ret = 0; 4328dd5f9615SStefan Behrens int received_uuid_changed; 43298ea05e3aSAlexander Block 43308ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43318ea05e3aSAlexander Block if (ret < 0) 43328ea05e3aSAlexander Block return ret; 43338ea05e3aSAlexander Block 43348ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 43358ea05e3aSAlexander Block 43368ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 43378ea05e3aSAlexander Block ret = -EINVAL; 43388ea05e3aSAlexander Block goto out; 43398ea05e3aSAlexander Block } 43408ea05e3aSAlexander Block 43418ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43428ea05e3aSAlexander Block ret = -EROFS; 43438ea05e3aSAlexander Block goto out; 43448ea05e3aSAlexander Block } 43458ea05e3aSAlexander Block 43468ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 43478ea05e3aSAlexander Block ret = -EACCES; 43488ea05e3aSAlexander Block goto out; 43498ea05e3aSAlexander Block } 43508ea05e3aSAlexander Block 43518ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 43528ea05e3aSAlexander Block if (IS_ERR(sa)) { 43538ea05e3aSAlexander Block ret = PTR_ERR(sa); 43548ea05e3aSAlexander Block sa = NULL; 43558ea05e3aSAlexander Block goto out; 43568ea05e3aSAlexander Block } 43578ea05e3aSAlexander Block 4358dd5f9615SStefan Behrens /* 4359dd5f9615SStefan Behrens * 1 - root item 4360dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4361dd5f9615SStefan Behrens */ 4362dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43638ea05e3aSAlexander Block if (IS_ERR(trans)) { 43648ea05e3aSAlexander Block ret = PTR_ERR(trans); 43658ea05e3aSAlexander Block trans = NULL; 43668ea05e3aSAlexander Block goto out; 43678ea05e3aSAlexander Block } 43688ea05e3aSAlexander Block 43698ea05e3aSAlexander Block sa->rtransid = trans->transid; 43708ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43718ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43728ea05e3aSAlexander Block 4373dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4374dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4375dd5f9615SStefan Behrens if (received_uuid_changed && 4376dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4377dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4378dd5f9615SStefan Behrens root_item->received_uuid, 4379dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4380dd5f9615SStefan Behrens root->root_key.objectid); 43818ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43828ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43838ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43843cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43853cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 43863cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 43873cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 43888ea05e3aSAlexander Block 43898ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 43908ea05e3aSAlexander Block &root->root_key, &root->root_item); 43918ea05e3aSAlexander Block if (ret < 0) { 43928ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 43938ea05e3aSAlexander Block goto out; 4394dd5f9615SStefan Behrens } 4395dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4396dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4397dd5f9615SStefan Behrens sa->uuid, 4398dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4399dd5f9615SStefan Behrens root->root_key.objectid); 4400dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4401dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4402dd5f9615SStefan Behrens goto out; 4403dd5f9615SStefan Behrens } 4404dd5f9615SStefan Behrens } 44058ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4406dd5f9615SStefan Behrens if (ret < 0) { 4407dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44088ea05e3aSAlexander Block goto out; 44098ea05e3aSAlexander Block } 44108ea05e3aSAlexander Block 44118ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44128ea05e3aSAlexander Block if (ret) 44138ea05e3aSAlexander Block ret = -EFAULT; 44148ea05e3aSAlexander Block 44158ea05e3aSAlexander Block out: 44168ea05e3aSAlexander Block kfree(sa); 44178ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 44188ea05e3aSAlexander Block mnt_drop_write_file(file); 44198ea05e3aSAlexander Block return ret; 44208ea05e3aSAlexander Block } 44218ea05e3aSAlexander Block 4422867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4423867ab667Sjeff.liu { 44246d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4425a1b83ac5SAnand Jain size_t len; 4426867ab667Sjeff.liu int ret; 4427a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4428a1b83ac5SAnand Jain 4429a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4430a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4431a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4432a1b83ac5SAnand Jain 4433a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4434867ab667Sjeff.liu 4435867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4436867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4437867ab667Sjeff.liu --len); 4438867ab667Sjeff.liu } 4439867ab667Sjeff.liu 4440867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4441867ab667Sjeff.liu 4442867ab667Sjeff.liu return ret ? -EFAULT : 0; 4443867ab667Sjeff.liu } 4444867ab667Sjeff.liu 4445a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4446a8bfd4abSjeff.liu { 44476d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4448a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4449a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4450a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4451a8bfd4abSjeff.liu int ret; 4452a8bfd4abSjeff.liu 4453a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4454a8bfd4abSjeff.liu return -EPERM; 4455a8bfd4abSjeff.liu 4456a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4457a8bfd4abSjeff.liu return -EFAULT; 4458a8bfd4abSjeff.liu 4459a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4460a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4461a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4462a8bfd4abSjeff.liu return -EINVAL; 4463a8bfd4abSjeff.liu } 4464a8bfd4abSjeff.liu 4465a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4466a8bfd4abSjeff.liu if (ret) 4467a8bfd4abSjeff.liu return ret; 4468a8bfd4abSjeff.liu 4469a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4470a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4471a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4472a8bfd4abSjeff.liu goto out_unlock; 4473a8bfd4abSjeff.liu } 4474a8bfd4abSjeff.liu 4475a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4476a8bfd4abSjeff.liu strcpy(super_block->label, label); 4477a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4478a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4479a8bfd4abSjeff.liu 4480a8bfd4abSjeff.liu out_unlock: 4481a8bfd4abSjeff.liu mnt_drop_write_file(file); 4482a8bfd4abSjeff.liu return ret; 4483a8bfd4abSjeff.liu } 4484a8bfd4abSjeff.liu 4485f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4486f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4487f46b5a66SChristoph Hellwig { 4488496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44894bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4490f46b5a66SChristoph Hellwig 4491f46b5a66SChristoph Hellwig switch (cmd) { 44926cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 44936cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 44946cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 44956cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 44966cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 44976cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4498f7039b1dSLi Dongyang case FITRIM: 4499f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4500f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4501fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4502fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4503fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45043de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4505fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45066f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45076f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 450876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 450976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 45100caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45110caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 45120caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45130caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45146ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45156ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4516f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45171e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45181e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45191e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4520f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4521198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4522f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45234bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4524f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4525da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4526475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4527475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4528475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4529475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4530f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 45319ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4532f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4533c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4534c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 45357a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4536f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4537f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4538f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4539f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4540ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4541ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4542ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4543ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4544d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4545d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4546d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4547d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 45481406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45491406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 4550f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 4551f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 4552f46b5a66SChristoph Hellwig return 0; 455346204592SSage Weil case BTRFS_IOC_START_SYNC: 45549a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 455546204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 45569a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4557475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4558b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4559475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4560475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4561475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4562475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4563c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 45649ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4565837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4566837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 456719a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 456819a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 45698ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 45708ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 457131db9f7cSAlexander Block case BTRFS_IOC_SEND: 457231db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4573c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4574b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 45755d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4576905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 45775d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4578905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 45795d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4580905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 45815d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4582905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 45832f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 45842f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 45852f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 45862f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 458757254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 458857254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 45893f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 45903f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4591867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4592867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4593a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4594a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4595416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4596416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 4597f46b5a66SChristoph Hellwig } 4598f46b5a66SChristoph Hellwig 4599f46b5a66SChristoph Hellwig return -ENOTTY; 4600f46b5a66SChristoph Hellwig } 4601