1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 59f46b5a66SChristoph Hellwig 60416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 61416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 62416161dbSMark Fasheh 636cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 646cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 656cbff00fSChristoph Hellwig { 666cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 676cbff00fSChristoph Hellwig return flags; 686cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 696cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 706cbff00fSChristoph Hellwig else 716cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 726cbff00fSChristoph Hellwig } 73f46b5a66SChristoph Hellwig 746cbff00fSChristoph Hellwig /* 756cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 766cbff00fSChristoph Hellwig */ 776cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 786cbff00fSChristoph Hellwig { 796cbff00fSChristoph Hellwig unsigned int iflags = 0; 806cbff00fSChristoph Hellwig 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 826cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 846cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 866cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 876cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 886cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 896cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 906cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 916cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 926cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 93d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 94d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 95d0092bddSLi Zefan 96d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 97d0092bddSLi Zefan iflags |= FS_COMPR_FL; 98d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 99d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1006cbff00fSChristoph Hellwig 1016cbff00fSChristoph Hellwig return iflags; 1026cbff00fSChristoph Hellwig } 1036cbff00fSChristoph Hellwig 1046cbff00fSChristoph Hellwig /* 1056cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1066cbff00fSChristoph Hellwig */ 1076cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1086cbff00fSChristoph Hellwig { 1096cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1106cbff00fSChristoph Hellwig 1116cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1126cbff00fSChristoph Hellwig 1136cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1146cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1176cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1186cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1196cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1206cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1216cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1226cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1236cbff00fSChristoph Hellwig } 1246cbff00fSChristoph Hellwig 1256cbff00fSChristoph Hellwig /* 1266cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1276cbff00fSChristoph Hellwig * 128e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1296cbff00fSChristoph Hellwig */ 1306cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1316cbff00fSChristoph Hellwig { 1320b4dcea5SChris Mason unsigned int flags; 1330b4dcea5SChris Mason 1340b4dcea5SChris Mason if (!dir) 1350b4dcea5SChris Mason return; 1360b4dcea5SChris Mason 1370b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1386cbff00fSChristoph Hellwig 139e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 140e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 141e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 142e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 143e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 144e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 145e27425d6SJosef Bacik } 1466cbff00fSChristoph Hellwig 147213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 148e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 149213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 150213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 151213490b3SLiu Bo } 152e27425d6SJosef Bacik 1536cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1546cbff00fSChristoph Hellwig } 1556cbff00fSChristoph Hellwig 1566cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1576cbff00fSChristoph Hellwig { 158496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1596cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1626cbff00fSChristoph Hellwig return -EFAULT; 1636cbff00fSChristoph Hellwig return 0; 1646cbff00fSChristoph Hellwig } 1656cbff00fSChristoph Hellwig 16675e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16775e7cb7fSLiu Bo { 16875e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16975e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17075e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 171e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 172e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17375e7cb7fSLiu Bo return -EOPNOTSUPP; 17475e7cb7fSLiu Bo 17575e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17675e7cb7fSLiu Bo return -EINVAL; 17775e7cb7fSLiu Bo 17875e7cb7fSLiu Bo return 0; 17975e7cb7fSLiu Bo } 18075e7cb7fSLiu Bo 1816cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1826cbff00fSChristoph Hellwig { 183496ad9aaSAl Viro struct inode *inode = file_inode(file); 1846cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1856cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1866cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1876cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1886cbff00fSChristoph Hellwig int ret; 189f062abf0SLi Zefan u64 ip_oldflags; 190f062abf0SLi Zefan unsigned int i_oldflags; 1917e97b8daSDavid Sterba umode_t mode; 1926cbff00fSChristoph Hellwig 193b83cc969SLi Zefan if (btrfs_root_readonly(root)) 194b83cc969SLi Zefan return -EROFS; 195b83cc969SLi Zefan 1966cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1976cbff00fSChristoph Hellwig return -EFAULT; 1986cbff00fSChristoph Hellwig 19975e7cb7fSLiu Bo ret = check_flags(flags); 20075e7cb7fSLiu Bo if (ret) 20175e7cb7fSLiu Bo return ret; 2026cbff00fSChristoph Hellwig 2032e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2046cbff00fSChristoph Hellwig return -EACCES; 2056cbff00fSChristoph Hellwig 206e7848683SJan Kara ret = mnt_want_write_file(file); 207e7848683SJan Kara if (ret) 208e7848683SJan Kara return ret; 209e7848683SJan Kara 2106cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2116cbff00fSChristoph Hellwig 212f062abf0SLi Zefan ip_oldflags = ip->flags; 213f062abf0SLi Zefan i_oldflags = inode->i_flags; 2147e97b8daSDavid Sterba mode = inode->i_mode; 215f062abf0SLi Zefan 2166cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2176cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2186cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2196cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2206cbff00fSChristoph Hellwig ret = -EPERM; 2216cbff00fSChristoph Hellwig goto out_unlock; 2226cbff00fSChristoph Hellwig } 2236cbff00fSChristoph Hellwig } 2246cbff00fSChristoph Hellwig 2256cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2266cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2276cbff00fSChristoph Hellwig else 2286cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2296cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2306cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2316cbff00fSChristoph Hellwig else 2326cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2336cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2346cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2356cbff00fSChristoph Hellwig else 2366cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2376cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2386cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2396cbff00fSChristoph Hellwig else 2406cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2416cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2426cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2436cbff00fSChristoph Hellwig else 2446cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2456cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2466cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2476cbff00fSChristoph Hellwig else 2486cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2497e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2507e97b8daSDavid Sterba if (S_ISREG(mode)) { 2517e97b8daSDavid Sterba /* 2527e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2537e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2547e97b8daSDavid Sterba * status of the file and will not set it. 2557e97b8daSDavid Sterba */ 2567e97b8daSDavid Sterba if (inode->i_size == 0) 2577e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2587e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2597e97b8daSDavid Sterba } else { 260e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2617e97b8daSDavid Sterba } 2627e97b8daSDavid Sterba } else { 2637e97b8daSDavid Sterba /* 2647e97b8daSDavid Sterba * Revert back under same assuptions as above 2657e97b8daSDavid Sterba */ 2667e97b8daSDavid Sterba if (S_ISREG(mode)) { 2677e97b8daSDavid Sterba if (inode->i_size == 0) 2687e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2697e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2707e97b8daSDavid Sterba } else { 271e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2727e97b8daSDavid Sterba } 2737e97b8daSDavid Sterba } 2746cbff00fSChristoph Hellwig 27575e7cb7fSLiu Bo /* 27675e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27775e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27875e7cb7fSLiu Bo * things smaller. 27975e7cb7fSLiu Bo */ 28075e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 28175e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 28275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28375e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 28475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 28575e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 286ebcb904dSLi Zefan } else { 287ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28875e7cb7fSLiu Bo } 2896cbff00fSChristoph Hellwig 2904da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 291f062abf0SLi Zefan if (IS_ERR(trans)) { 292f062abf0SLi Zefan ret = PTR_ERR(trans); 293f062abf0SLi Zefan goto out_drop; 294f062abf0SLi Zefan } 2956cbff00fSChristoph Hellwig 296306424ccSLi Zefan btrfs_update_iflags(inode); 2970c4d2d95SJosef Bacik inode_inc_iversion(inode); 298306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2996cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3006cbff00fSChristoph Hellwig 3016cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 302f062abf0SLi Zefan out_drop: 303f062abf0SLi Zefan if (ret) { 304f062abf0SLi Zefan ip->flags = ip_oldflags; 305f062abf0SLi Zefan inode->i_flags = i_oldflags; 306f062abf0SLi Zefan } 3076cbff00fSChristoph Hellwig 3086cbff00fSChristoph Hellwig out_unlock: 3096cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 310e7848683SJan Kara mnt_drop_write_file(file); 3112d4e6f6aSliubo return ret; 3126cbff00fSChristoph Hellwig } 3136cbff00fSChristoph Hellwig 3146cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3156cbff00fSChristoph Hellwig { 316496ad9aaSAl Viro struct inode *inode = file_inode(file); 3176cbff00fSChristoph Hellwig 3186cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3196cbff00fSChristoph Hellwig } 320f46b5a66SChristoph Hellwig 321f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 322f7039b1dSLi Dongyang { 323815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 324f7039b1dSLi Dongyang struct btrfs_device *device; 325f7039b1dSLi Dongyang struct request_queue *q; 326f7039b1dSLi Dongyang struct fstrim_range range; 327f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 328f7039b1dSLi Dongyang u64 num_devices = 0; 329815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 330f7039b1dSLi Dongyang int ret; 331f7039b1dSLi Dongyang 332f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 333f7039b1dSLi Dongyang return -EPERM; 334f7039b1dSLi Dongyang 3351f78160cSXiao Guangrong rcu_read_lock(); 3361f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3371f78160cSXiao Guangrong dev_list) { 338f7039b1dSLi Dongyang if (!device->bdev) 339f7039b1dSLi Dongyang continue; 340f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 341f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 342f7039b1dSLi Dongyang num_devices++; 343f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 344f7039b1dSLi Dongyang minlen); 345f7039b1dSLi Dongyang } 346f7039b1dSLi Dongyang } 3471f78160cSXiao Guangrong rcu_read_unlock(); 348f4c697e6SLukas Czerner 349f7039b1dSLi Dongyang if (!num_devices) 350f7039b1dSLi Dongyang return -EOPNOTSUPP; 351f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 352f7039b1dSLi Dongyang return -EFAULT; 353e515c18bSLukas Czerner if (range.start > total_bytes || 354e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 355f4c697e6SLukas Czerner return -EINVAL; 356f7039b1dSLi Dongyang 357f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 358f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 359815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 360f7039b1dSLi Dongyang if (ret < 0) 361f7039b1dSLi Dongyang return ret; 362f7039b1dSLi Dongyang 363f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 364f7039b1dSLi Dongyang return -EFAULT; 365f7039b1dSLi Dongyang 366f7039b1dSLi Dongyang return 0; 367f7039b1dSLi Dongyang } 368f7039b1dSLi Dongyang 369dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 370dd5f9615SStefan Behrens { 371b19e6843SDulshani Gunawardhana BUILD_BUG_ON(BTRFS_UUID_SIZE > PAGE_SIZE); 372b19e6843SDulshani Gunawardhana return !memcmp(uuid, empty_zero_page, BTRFS_UUID_SIZE); 373dd5f9615SStefan Behrens } 374dd5f9615SStefan Behrens 375d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 376cb8e7090SChristoph Hellwig struct dentry *dentry, 37772fd032eSSage Weil char *name, int namelen, 3786f72c7e2SArne Jansen u64 *async_transid, 3798696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 380f46b5a66SChristoph Hellwig { 381f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 382f46b5a66SChristoph Hellwig struct btrfs_key key; 383f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 384f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 385f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 386d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 38776dda93cSYan, Zheng struct btrfs_root *new_root; 388d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3898ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 390f46b5a66SChristoph Hellwig int ret; 391f46b5a66SChristoph Hellwig int err; 392f46b5a66SChristoph Hellwig u64 objectid; 393f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3943de4586cSChris Mason u64 index = 0; 395d5c12070SMiao Xie u64 qgroup_reserved; 3968ea05e3aSAlexander Block uuid_le new_uuid; 397f46b5a66SChristoph Hellwig 398581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3992fbe8c8aSAl Viro if (ret) 400a22285a6SYan, Zheng return ret; 4016a912213SJosef Bacik 402d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4039ed74f2dSJosef Bacik /* 404d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 405d5c12070SMiao Xie * of create_snapshot(). 4069ed74f2dSJosef Bacik */ 407d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 408dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 409d5c12070SMiao Xie if (ret) 410d5c12070SMiao Xie return ret; 411f46b5a66SChristoph Hellwig 412d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 413d5c12070SMiao Xie if (IS_ERR(trans)) { 414d5c12070SMiao Xie ret = PTR_ERR(trans); 415d5c12070SMiao Xie goto out; 416d5c12070SMiao Xie } 417d5c12070SMiao Xie trans->block_rsv = &block_rsv; 418d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 419f46b5a66SChristoph Hellwig 4208696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4216f72c7e2SArne Jansen if (ret) 4226f72c7e2SArne Jansen goto fail; 4236f72c7e2SArne Jansen 4245d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4255581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4268e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4278e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4288e8a1e31SJosef Bacik goto fail; 4298e8a1e31SJosef Bacik } 430f46b5a66SChristoph Hellwig 4315d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 432f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 433f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4345d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 435f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 436f46b5a66SChristoph Hellwig 4370a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 438f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4395d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 440b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4415d4f98a2SYan Zheng BTRFS_UUID_SIZE); 442f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 443f46b5a66SChristoph Hellwig 4448ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4458ea05e3aSAlexander Block 446f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4473cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 4483cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 4493cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 4503cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 4513cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 452f46b5a66SChristoph Hellwig 4533cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 4543cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 4553cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 45608fe4db1SLi Zefan 457f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 45884234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 459f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 460f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 46186b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 46280ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 463f46b5a66SChristoph Hellwig 4648ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4658ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4668ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4678ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4683cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 4693cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 4708ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4718ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4728ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 473f46b5a66SChristoph Hellwig 474925baeddSChris Mason btrfs_tree_unlock(leaf); 475f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 476f46b5a66SChristoph Hellwig leaf = NULL; 477f46b5a66SChristoph Hellwig 478f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 479f46b5a66SChristoph Hellwig 480f46b5a66SChristoph Hellwig key.objectid = objectid; 4815d4f98a2SYan Zheng key.offset = 0; 482f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 483f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 484f46b5a66SChristoph Hellwig &root_item); 485f46b5a66SChristoph Hellwig if (ret) 486f46b5a66SChristoph Hellwig goto fail; 487f46b5a66SChristoph Hellwig 48876dda93cSYan, Zheng key.offset = (u64)-1; 48976dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 49079787eaaSJeff Mahoney if (IS_ERR(new_root)) { 49179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 49279787eaaSJeff Mahoney ret = PTR_ERR(new_root); 49379787eaaSJeff Mahoney goto fail; 49479787eaaSJeff Mahoney } 49576dda93cSYan, Zheng 49676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 49776dda93cSYan, Zheng 498d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 499ce598979SMark Fasheh if (ret) { 500ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 50179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 502ce598979SMark Fasheh goto fail; 503ce598979SMark Fasheh } 504ce598979SMark Fasheh 505f46b5a66SChristoph Hellwig /* 506f46b5a66SChristoph Hellwig * insert the directory item 507f46b5a66SChristoph Hellwig */ 5083de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 50979787eaaSJeff Mahoney if (ret) { 51079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 51179787eaaSJeff Mahoney goto fail; 51279787eaaSJeff Mahoney } 5133de4586cSChris Mason 5143de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 51516cdcec7SMiao Xie name, namelen, dir, &key, 5163de4586cSChris Mason BTRFS_FT_DIR, index); 51779787eaaSJeff Mahoney if (ret) { 51879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 519f46b5a66SChristoph Hellwig goto fail; 52079787eaaSJeff Mahoney } 5210660b5afSChris Mason 52252c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 52352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 52452c26179SYan Zheng BUG_ON(ret); 52552c26179SYan Zheng 5260660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5274df27c4dSYan, Zheng objectid, root->root_key.objectid, 52833345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5290660b5afSChris Mason BUG_ON(ret); 5300660b5afSChris Mason 531dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 532dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 533dd5f9615SStefan Behrens objectid); 534dd5f9615SStefan Behrens if (ret) 535dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 536dd5f9615SStefan Behrens 537f46b5a66SChristoph Hellwig fail: 538d5c12070SMiao Xie trans->block_rsv = NULL; 539d5c12070SMiao Xie trans->bytes_reserved = 0; 54072fd032eSSage Weil if (async_transid) { 54172fd032eSSage Weil *async_transid = trans->transid; 54272fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 54300d71c9cSMiao Xie if (err) 54400d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 54572fd032eSSage Weil } else { 54676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 54772fd032eSSage Weil } 548f46b5a66SChristoph Hellwig if (err && !ret) 549f46b5a66SChristoph Hellwig ret = err; 5501a65e24bSChris Mason 5511a65e24bSChris Mason if (!ret) 5521a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 553d5c12070SMiao Xie out: 554d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 555f46b5a66SChristoph Hellwig return ret; 556f46b5a66SChristoph Hellwig } 557f46b5a66SChristoph Hellwig 558e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 559e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 560e9662f70SMiao Xie u64 *async_transid, bool readonly, 561e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 562f46b5a66SChristoph Hellwig { 5632e4bfab9SYan, Zheng struct inode *inode; 564f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 565f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5662e4bfab9SYan, Zheng int ret; 567f46b5a66SChristoph Hellwig 568f46b5a66SChristoph Hellwig if (!root->ref_cows) 569f46b5a66SChristoph Hellwig return -EINVAL; 570f46b5a66SChristoph Hellwig 5716a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 5726a03843dSMiao Xie if (ret) 5736a03843dSMiao Xie return ret; 5746a03843dSMiao Xie 575f0de181cSJosef Bacik btrfs_wait_ordered_extents(root); 5766a03843dSMiao Xie 577a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 578a22285a6SYan, Zheng if (!pending_snapshot) 579a22285a6SYan, Zheng return -ENOMEM; 580a22285a6SYan, Zheng 58166d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 58266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 583d5c12070SMiao Xie /* 584d5c12070SMiao Xie * 1 - parent dir inode 585d5c12070SMiao Xie * 2 - dir entries 586d5c12070SMiao Xie * 1 - root item 587d5c12070SMiao Xie * 2 - root ref/backref 588d5c12070SMiao Xie * 1 - root of snapshot 589dd5f9615SStefan Behrens * 1 - UUID item 590d5c12070SMiao Xie */ 591d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 592dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 593ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 594ee3441b4SJeff Mahoney false); 595d5c12070SMiao Xie if (ret) 596d5c12070SMiao Xie goto out; 597d5c12070SMiao Xie 598a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 599a22285a6SYan, Zheng pending_snapshot->root = root; 600b83cc969SLi Zefan pending_snapshot->readonly = readonly; 601e9662f70SMiao Xie pending_snapshot->dir = dir; 6028696c533SMiao Xie pending_snapshot->inherit = inherit; 603a22285a6SYan, Zheng 604d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 605a22285a6SYan, Zheng if (IS_ERR(trans)) { 606a22285a6SYan, Zheng ret = PTR_ERR(trans); 607a22285a6SYan, Zheng goto fail; 608a22285a6SYan, Zheng } 609a22285a6SYan, Zheng 6108351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 611a22285a6SYan, Zheng list_add(&pending_snapshot->list, 612a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6138351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 61472fd032eSSage Weil if (async_transid) { 61572fd032eSSage Weil *async_transid = trans->transid; 61672fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 61772fd032eSSage Weil root->fs_info->extent_root, 1); 61800d71c9cSMiao Xie if (ret) 61900d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 62072fd032eSSage Weil } else { 62172fd032eSSage Weil ret = btrfs_commit_transaction(trans, 62272fd032eSSage Weil root->fs_info->extent_root); 62372fd032eSSage Weil } 624aec8030aSMiao Xie if (ret) 625c37b2b62SJosef Bacik goto fail; 626a22285a6SYan, Zheng 627a22285a6SYan, Zheng ret = pending_snapshot->error; 628f46b5a66SChristoph Hellwig if (ret) 6292e4bfab9SYan, Zheng goto fail; 630f46b5a66SChristoph Hellwig 63166b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 63266b4ffd1SJosef Bacik if (ret) 63366b4ffd1SJosef Bacik goto fail; 634f46b5a66SChristoph Hellwig 6352fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6362e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6372e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6382e4bfab9SYan, Zheng goto fail; 6392e4bfab9SYan, Zheng } 6402e4bfab9SYan, Zheng BUG_ON(!inode); 6412e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6422e4bfab9SYan, Zheng ret = 0; 6432e4bfab9SYan, Zheng fail: 644d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 645d5c12070SMiao Xie &pending_snapshot->block_rsv, 646d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 647d5c12070SMiao Xie out: 648a22285a6SYan, Zheng kfree(pending_snapshot); 649f46b5a66SChristoph Hellwig return ret; 650f46b5a66SChristoph Hellwig } 651f46b5a66SChristoph Hellwig 6524260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6534260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6544260f7c7SSage Weil * minimal. 6554260f7c7SSage Weil */ 6564260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6574260f7c7SSage Weil { 6582f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6594260f7c7SSage Weil 6604260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6614260f7c7SSage Weil return 0; 6622f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6634260f7c7SSage Weil return 0; 6642f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6654260f7c7SSage Weil return 0; 6664260f7c7SSage Weil return !capable(CAP_FOWNER); 6674260f7c7SSage Weil } 6684260f7c7SSage Weil 6694260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6704260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6714260f7c7SSage Weil * whether the type of victim is right. 6724260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6734260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6744260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6754260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6764260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6774260f7c7SSage Weil * a. be owner of dir, or 6784260f7c7SSage Weil * b. be owner of victim, or 6794260f7c7SSage Weil * c. have CAP_FOWNER capability 6804260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6814260f7c7SSage Weil * links pointing to it. 6824260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6834260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6844260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6854260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6864260f7c7SSage Weil * nfs_async_unlink(). 6874260f7c7SSage Weil */ 6884260f7c7SSage Weil 6894260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6904260f7c7SSage Weil { 6914260f7c7SSage Weil int error; 6924260f7c7SSage Weil 6934260f7c7SSage Weil if (!victim->d_inode) 6944260f7c7SSage Weil return -ENOENT; 6954260f7c7SSage Weil 6964260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6974fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 6984260f7c7SSage Weil 6994260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7004260f7c7SSage Weil if (error) 7014260f7c7SSage Weil return error; 7024260f7c7SSage Weil if (IS_APPEND(dir)) 7034260f7c7SSage Weil return -EPERM; 7044260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7054260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7064260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7074260f7c7SSage Weil return -EPERM; 7084260f7c7SSage Weil if (isdir) { 7094260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7104260f7c7SSage Weil return -ENOTDIR; 7114260f7c7SSage Weil if (IS_ROOT(victim)) 7124260f7c7SSage Weil return -EBUSY; 7134260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7144260f7c7SSage Weil return -EISDIR; 7154260f7c7SSage Weil if (IS_DEADDIR(dir)) 7164260f7c7SSage Weil return -ENOENT; 7174260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7184260f7c7SSage Weil return -EBUSY; 7194260f7c7SSage Weil return 0; 7204260f7c7SSage Weil } 7214260f7c7SSage Weil 722cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 723cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 724cb8e7090SChristoph Hellwig { 725cb8e7090SChristoph Hellwig if (child->d_inode) 726cb8e7090SChristoph Hellwig return -EEXIST; 727cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 728cb8e7090SChristoph Hellwig return -ENOENT; 729cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 730cb8e7090SChristoph Hellwig } 731cb8e7090SChristoph Hellwig 732cb8e7090SChristoph Hellwig /* 733cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 734cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 735cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 736cb8e7090SChristoph Hellwig */ 73776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 73876dda93cSYan, Zheng char *name, int namelen, 73972fd032eSSage Weil struct btrfs_root *snap_src, 7406f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7418696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 742cb8e7090SChristoph Hellwig { 74376dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 744cb8e7090SChristoph Hellwig struct dentry *dentry; 745cb8e7090SChristoph Hellwig int error; 746cb8e7090SChristoph Hellwig 7475c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7485c50c9b8SDavid Sterba if (error == -EINTR) 7495c50c9b8SDavid Sterba return error; 750cb8e7090SChristoph Hellwig 751cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 752cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 753cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 754cb8e7090SChristoph Hellwig goto out_unlock; 755cb8e7090SChristoph Hellwig 756cb8e7090SChristoph Hellwig error = -EEXIST; 757cb8e7090SChristoph Hellwig if (dentry->d_inode) 758cb8e7090SChristoph Hellwig goto out_dput; 759cb8e7090SChristoph Hellwig 76076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 761cb8e7090SChristoph Hellwig if (error) 762a874a63eSLiu Bo goto out_dput; 763cb8e7090SChristoph Hellwig 7649c52057cSChris Mason /* 7659c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7669c52057cSChris Mason * check for them now when we can safely fail 7679c52057cSChris Mason */ 7689c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7699c52057cSChris Mason dir->i_ino, name, 7709c52057cSChris Mason namelen); 7719c52057cSChris Mason if (error) 7729c52057cSChris Mason goto out_dput; 7739c52057cSChris Mason 77476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 77576dda93cSYan, Zheng 77676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 77776dda93cSYan, Zheng goto out_up_read; 77876dda93cSYan, Zheng 7793de4586cSChris Mason if (snap_src) { 780e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7816f72c7e2SArne Jansen async_transid, readonly, inherit); 7823de4586cSChris Mason } else { 783d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 784d5c12070SMiao Xie async_transid, inherit); 7853de4586cSChris Mason } 78676dda93cSYan, Zheng if (!error) 78776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 78876dda93cSYan, Zheng out_up_read: 78976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 790cb8e7090SChristoph Hellwig out_dput: 791cb8e7090SChristoph Hellwig dput(dentry); 792cb8e7090SChristoph Hellwig out_unlock: 79376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 794cb8e7090SChristoph Hellwig return error; 795cb8e7090SChristoph Hellwig } 796cb8e7090SChristoph Hellwig 7974cb5300bSChris Mason /* 7984cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7994cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8004cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8014cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8024cb5300bSChris Mason * part of the file 8034cb5300bSChris Mason */ 8044cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8054cb5300bSChris Mason { 8064cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8074cb5300bSChris Mason struct extent_map *em = NULL; 8084cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8094cb5300bSChris Mason u64 end; 8104cb5300bSChris Mason 8114cb5300bSChris Mason read_lock(&em_tree->lock); 8124cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8134cb5300bSChris Mason read_unlock(&em_tree->lock); 8144cb5300bSChris Mason 8154cb5300bSChris Mason if (em) { 8164cb5300bSChris Mason end = extent_map_end(em); 8174cb5300bSChris Mason free_extent_map(em); 8184cb5300bSChris Mason if (end - offset > thresh) 8194cb5300bSChris Mason return 0; 8204cb5300bSChris Mason } 8214cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8224cb5300bSChris Mason thresh /= 2; 8234cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8244cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8254cb5300bSChris Mason if (end >= thresh) 8264cb5300bSChris Mason return 0; 8274cb5300bSChris Mason return 1; 8284cb5300bSChris Mason } 8294cb5300bSChris Mason 8304cb5300bSChris Mason /* 8314cb5300bSChris Mason * helper function to walk through a file and find extents 8324cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8334cb5300bSChris Mason * 8344cb5300bSChris Mason * This is used by the defragging code to find new and small 8354cb5300bSChris Mason * extents 8364cb5300bSChris Mason */ 8374cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8384cb5300bSChris Mason struct inode *inode, u64 newer_than, 8394cb5300bSChris Mason u64 *off, int thresh) 8404cb5300bSChris Mason { 8414cb5300bSChris Mason struct btrfs_path *path; 8424cb5300bSChris Mason struct btrfs_key min_key; 8434cb5300bSChris Mason struct extent_buffer *leaf; 8444cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8454cb5300bSChris Mason int type; 8464cb5300bSChris Mason int ret; 847a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8484cb5300bSChris Mason 8494cb5300bSChris Mason path = btrfs_alloc_path(); 8504cb5300bSChris Mason if (!path) 8514cb5300bSChris Mason return -ENOMEM; 8524cb5300bSChris Mason 853a4689d2bSDavid Sterba min_key.objectid = ino; 8544cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8554cb5300bSChris Mason min_key.offset = *off; 8564cb5300bSChris Mason 8574cb5300bSChris Mason path->keep_locks = 1; 8584cb5300bSChris Mason 8594cb5300bSChris Mason while(1) { 8606174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 8614cb5300bSChris Mason if (ret != 0) 8624cb5300bSChris Mason goto none; 863a4689d2bSDavid Sterba if (min_key.objectid != ino) 8644cb5300bSChris Mason goto none; 8654cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8664cb5300bSChris Mason goto none; 8674cb5300bSChris Mason 8684cb5300bSChris Mason leaf = path->nodes[0]; 8694cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8704cb5300bSChris Mason struct btrfs_file_extent_item); 8714cb5300bSChris Mason 8724cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8734cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8744cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8754cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8764cb5300bSChris Mason *off = min_key.offset; 8774cb5300bSChris Mason btrfs_free_path(path); 8784cb5300bSChris Mason return 0; 8794cb5300bSChris Mason } 8804cb5300bSChris Mason 8814cb5300bSChris Mason if (min_key.offset == (u64)-1) 8824cb5300bSChris Mason goto none; 8834cb5300bSChris Mason 8844cb5300bSChris Mason min_key.offset++; 8854cb5300bSChris Mason btrfs_release_path(path); 8864cb5300bSChris Mason } 8874cb5300bSChris Mason none: 8884cb5300bSChris Mason btrfs_free_path(path); 8894cb5300bSChris Mason return -ENOENT; 8904cb5300bSChris Mason } 8914cb5300bSChris Mason 8926c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 89317ce6ef8SLiu Bo { 89417ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 895940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8966c282eb4SLi Zefan struct extent_map *em; 8976c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 898940100a4SChris Mason 899940100a4SChris Mason /* 900940100a4SChris Mason * hopefully we have this extent in the tree already, try without 901940100a4SChris Mason * the full extent lock 902940100a4SChris Mason */ 903940100a4SChris Mason read_lock(&em_tree->lock); 904940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 905940100a4SChris Mason read_unlock(&em_tree->lock); 906940100a4SChris Mason 907940100a4SChris Mason if (!em) { 908940100a4SChris Mason /* get the big lock and read metadata off disk */ 909d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 910940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 911d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 912940100a4SChris Mason 9136cf8bfbfSDan Carpenter if (IS_ERR(em)) 9146c282eb4SLi Zefan return NULL; 915940100a4SChris Mason } 916940100a4SChris Mason 9176c282eb4SLi Zefan return em; 9186c282eb4SLi Zefan } 9196c282eb4SLi Zefan 9206c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9216c282eb4SLi Zefan { 9226c282eb4SLi Zefan struct extent_map *next; 9236c282eb4SLi Zefan bool ret = true; 9246c282eb4SLi Zefan 9256c282eb4SLi Zefan /* this is the last extent */ 9266c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9276c282eb4SLi Zefan return false; 9286c282eb4SLi Zefan 9296c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9306c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9316c282eb4SLi Zefan ret = false; 9326c282eb4SLi Zefan 9336c282eb4SLi Zefan free_extent_map(next); 9346c282eb4SLi Zefan return ret; 9356c282eb4SLi Zefan } 9366c282eb4SLi Zefan 9376c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 938a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 939a43a2111SAndrew Mahone int compress) 9406c282eb4SLi Zefan { 9416c282eb4SLi Zefan struct extent_map *em; 9426c282eb4SLi Zefan int ret = 1; 9436c282eb4SLi Zefan bool next_mergeable = true; 9446c282eb4SLi Zefan 9456c282eb4SLi Zefan /* 9466c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9476c282eb4SLi Zefan * defragging it 9486c282eb4SLi Zefan */ 9496c282eb4SLi Zefan if (start < *defrag_end) 9506c282eb4SLi Zefan return 1; 9516c282eb4SLi Zefan 9526c282eb4SLi Zefan *skip = 0; 9536c282eb4SLi Zefan 9546c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9556c282eb4SLi Zefan if (!em) 9566c282eb4SLi Zefan return 0; 9576c282eb4SLi Zefan 958940100a4SChris Mason /* this will cover holes, and inline extents */ 95917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 960940100a4SChris Mason ret = 0; 96117ce6ef8SLiu Bo goto out; 96217ce6ef8SLiu Bo } 96317ce6ef8SLiu Bo 9646c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 965940100a4SChris Mason 966940100a4SChris Mason /* 9676c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9686c282eb4SLi Zefan * real extent, don't bother defragging it 969940100a4SChris Mason */ 970a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9716c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 972940100a4SChris Mason ret = 0; 97317ce6ef8SLiu Bo out: 974940100a4SChris Mason /* 975940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 976940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 977940100a4SChris Mason * so that the next tiny extent will force a defrag. 978940100a4SChris Mason * 979940100a4SChris Mason * The end result of this is that tiny extents before a single big 980940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 981940100a4SChris Mason */ 982940100a4SChris Mason if (ret) { 983940100a4SChris Mason *defrag_end = extent_map_end(em); 984940100a4SChris Mason } else { 985940100a4SChris Mason *last_len = 0; 986940100a4SChris Mason *skip = extent_map_end(em); 987940100a4SChris Mason *defrag_end = 0; 988940100a4SChris Mason } 989940100a4SChris Mason 990940100a4SChris Mason free_extent_map(em); 991940100a4SChris Mason return ret; 992940100a4SChris Mason } 993940100a4SChris Mason 9944cb5300bSChris Mason /* 9954cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9964cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9974cb5300bSChris Mason * to COW and defrag. 9984cb5300bSChris Mason * 9994cb5300bSChris Mason * It also makes sure the delalloc code has enough 10004cb5300bSChris Mason * dirty data to avoid making new small extents as part 10014cb5300bSChris Mason * of the defrag 10024cb5300bSChris Mason * 10034cb5300bSChris Mason * It's a good idea to start RA on this range 10044cb5300bSChris Mason * before calling this. 10054cb5300bSChris Mason */ 10064cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10074cb5300bSChris Mason struct page **pages, 10084cb5300bSChris Mason unsigned long start_index, 10094cb5300bSChris Mason int num_pages) 1010f46b5a66SChristoph Hellwig { 10114cb5300bSChris Mason unsigned long file_end; 10124cb5300bSChris Mason u64 isize = i_size_read(inode); 1013f46b5a66SChristoph Hellwig u64 page_start; 1014f46b5a66SChristoph Hellwig u64 page_end; 10151f12bd06SLiu Bo u64 page_cnt; 10164cb5300bSChris Mason int ret; 10174cb5300bSChris Mason int i; 10184cb5300bSChris Mason int i_done; 10194cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10204cb5300bSChris Mason struct extent_state *cached_state = NULL; 1021600a45e1SMiao Xie struct extent_io_tree *tree; 10223b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10234cb5300bSChris Mason 10244cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10251f12bd06SLiu Bo if (!isize || start_index > file_end) 10261f12bd06SLiu Bo return 0; 10271f12bd06SLiu Bo 10281f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10294cb5300bSChris Mason 10304cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10311f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10324cb5300bSChris Mason if (ret) 10334cb5300bSChris Mason return ret; 10344cb5300bSChris Mason i_done = 0; 1035600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10364cb5300bSChris Mason 10374cb5300bSChris Mason /* step one, lock all the pages */ 10381f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10394cb5300bSChris Mason struct page *page; 1040600a45e1SMiao Xie again: 1041a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10423b16a4e3SJosef Bacik start_index + i, mask); 10434cb5300bSChris Mason if (!page) 10444cb5300bSChris Mason break; 10454cb5300bSChris Mason 1046600a45e1SMiao Xie page_start = page_offset(page); 1047600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1048600a45e1SMiao Xie while (1) { 1049d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1050600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1051600a45e1SMiao Xie page_start); 1052d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1053600a45e1SMiao Xie if (!ordered) 1054600a45e1SMiao Xie break; 1055600a45e1SMiao Xie 1056600a45e1SMiao Xie unlock_page(page); 1057600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1058600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1059600a45e1SMiao Xie lock_page(page); 10601f12bd06SLiu Bo /* 10611f12bd06SLiu Bo * we unlocked the page above, so we need check if 10621f12bd06SLiu Bo * it was released or not. 10631f12bd06SLiu Bo */ 10641f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10651f12bd06SLiu Bo unlock_page(page); 10661f12bd06SLiu Bo page_cache_release(page); 10671f12bd06SLiu Bo goto again; 10681f12bd06SLiu Bo } 1069600a45e1SMiao Xie } 1070600a45e1SMiao Xie 10714cb5300bSChris Mason if (!PageUptodate(page)) { 10724cb5300bSChris Mason btrfs_readpage(NULL, page); 10734cb5300bSChris Mason lock_page(page); 10744cb5300bSChris Mason if (!PageUptodate(page)) { 10754cb5300bSChris Mason unlock_page(page); 10764cb5300bSChris Mason page_cache_release(page); 10774cb5300bSChris Mason ret = -EIO; 10784cb5300bSChris Mason break; 10794cb5300bSChris Mason } 10804cb5300bSChris Mason } 1081600a45e1SMiao Xie 1082600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1083600a45e1SMiao Xie unlock_page(page); 1084600a45e1SMiao Xie page_cache_release(page); 1085600a45e1SMiao Xie goto again; 1086600a45e1SMiao Xie } 1087600a45e1SMiao Xie 10884cb5300bSChris Mason pages[i] = page; 10894cb5300bSChris Mason i_done++; 10904cb5300bSChris Mason } 10914cb5300bSChris Mason if (!i_done || ret) 10924cb5300bSChris Mason goto out; 10934cb5300bSChris Mason 10944cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10954cb5300bSChris Mason goto out; 10964cb5300bSChris Mason 10974cb5300bSChris Mason /* 10984cb5300bSChris Mason * so now we have a nice long stream of locked 10994cb5300bSChris Mason * and up to date pages, lets wait on them 11004cb5300bSChris Mason */ 11014cb5300bSChris Mason for (i = 0; i < i_done; i++) 11024cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11034cb5300bSChris Mason 11044cb5300bSChris Mason page_start = page_offset(pages[0]); 11054cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11064cb5300bSChris Mason 11074cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1108d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11094cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11104cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11119e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11129e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11134cb5300bSChris Mason 11141f12bd06SLiu Bo if (i_done != page_cnt) { 11159e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11169e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11179e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11184cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11191f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11204cb5300bSChris Mason } 11214cb5300bSChris Mason 11224cb5300bSChris Mason 11239e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11249e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11254cb5300bSChris Mason 11264cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11274cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11284cb5300bSChris Mason GFP_NOFS); 11294cb5300bSChris Mason 11304cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11314cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11324cb5300bSChris Mason ClearPageChecked(pages[i]); 11334cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11344cb5300bSChris Mason set_page_dirty(pages[i]); 11354cb5300bSChris Mason unlock_page(pages[i]); 11364cb5300bSChris Mason page_cache_release(pages[i]); 11374cb5300bSChris Mason } 11384cb5300bSChris Mason return i_done; 11394cb5300bSChris Mason out: 11404cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11414cb5300bSChris Mason unlock_page(pages[i]); 11424cb5300bSChris Mason page_cache_release(pages[i]); 11434cb5300bSChris Mason } 11441f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11454cb5300bSChris Mason return ret; 11464cb5300bSChris Mason 11474cb5300bSChris Mason } 11484cb5300bSChris Mason 11494cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11504cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11514cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11524cb5300bSChris Mason { 11534cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11544cb5300bSChris Mason struct file_ra_state *ra = NULL; 11554cb5300bSChris Mason unsigned long last_index; 1156151a31b2SLi Zefan u64 isize = i_size_read(inode); 1157940100a4SChris Mason u64 last_len = 0; 1158940100a4SChris Mason u64 skip = 0; 1159940100a4SChris Mason u64 defrag_end = 0; 11604cb5300bSChris Mason u64 newer_off = range->start; 1161f46b5a66SChristoph Hellwig unsigned long i; 1162008873eaSLi Zefan unsigned long ra_index = 0; 1163f46b5a66SChristoph Hellwig int ret; 11644cb5300bSChris Mason int defrag_count = 0; 11651a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11664cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1167008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1168008873eaSLi Zefan int cluster = max_cluster; 11694cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11704cb5300bSChris Mason struct page **pages = NULL; 11714cb5300bSChris Mason 11720abd5b17SLiu Bo if (isize == 0) 11730abd5b17SLiu Bo return 0; 11740abd5b17SLiu Bo 11750abd5b17SLiu Bo if (range->start >= isize) 11760abd5b17SLiu Bo return -EINVAL; 11771a419d85SLi Zefan 11781a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11791a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11801a419d85SLi Zefan return -EINVAL; 11811a419d85SLi Zefan if (range->compress_type) 11821a419d85SLi Zefan compress_type = range->compress_type; 11831a419d85SLi Zefan } 1184f46b5a66SChristoph Hellwig 11850abd5b17SLiu Bo if (extent_thresh == 0) 11860abd5b17SLiu Bo extent_thresh = 256 * 1024; 1187f46b5a66SChristoph Hellwig 11884cb5300bSChris Mason /* 11894cb5300bSChris Mason * if we were not given a file, allocate a readahead 11904cb5300bSChris Mason * context 11914cb5300bSChris Mason */ 11924cb5300bSChris Mason if (!file) { 11934cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11944cb5300bSChris Mason if (!ra) 11954cb5300bSChris Mason return -ENOMEM; 11964cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11974cb5300bSChris Mason } else { 11984cb5300bSChris Mason ra = &file->f_ra; 11994cb5300bSChris Mason } 12004cb5300bSChris Mason 1201*d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12024cb5300bSChris Mason GFP_NOFS); 12034cb5300bSChris Mason if (!pages) { 12044cb5300bSChris Mason ret = -ENOMEM; 12054cb5300bSChris Mason goto out_ra; 12064cb5300bSChris Mason } 12074cb5300bSChris Mason 12084cb5300bSChris Mason /* find the last page to defrag */ 12091e701a32SChris Mason if (range->start + range->len > range->start) { 1210151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12111e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12121e701a32SChris Mason } else { 1213151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12141e701a32SChris Mason } 12151e701a32SChris Mason 12164cb5300bSChris Mason if (newer_than) { 12174cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12184cb5300bSChris Mason &newer_off, 64 * 1024); 12194cb5300bSChris Mason if (!ret) { 12204cb5300bSChris Mason range->start = newer_off; 12214cb5300bSChris Mason /* 12224cb5300bSChris Mason * we always align our defrag to help keep 12234cb5300bSChris Mason * the extents in the file evenly spaced 12244cb5300bSChris Mason */ 12254cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12264cb5300bSChris Mason } else 12274cb5300bSChris Mason goto out_ra; 12284cb5300bSChris Mason } else { 12291e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12304cb5300bSChris Mason } 12314cb5300bSChris Mason if (!max_to_defrag) 12327ec31b54SLiu Bo max_to_defrag = last_index + 1; 12334cb5300bSChris Mason 12342a0f7f57SLi Zefan /* 12352a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12362a0f7f57SLi Zefan * written sequentially. 12372a0f7f57SLi Zefan */ 12382a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12392a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12402a0f7f57SLi Zefan 1241f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1242f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1243f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12444cb5300bSChris Mason /* 12454cb5300bSChris Mason * make sure we stop running if someone unmounts 12464cb5300bSChris Mason * the FS 12474cb5300bSChris Mason */ 12484cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12494cb5300bSChris Mason break; 12504cb5300bSChris Mason 1251210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1252210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1253210549ebSDavid Sterba ret = -EAGAIN; 1254210549ebSDavid Sterba break; 1255210549ebSDavid Sterba } 1256210549ebSDavid Sterba 125766c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12586c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1259a43a2111SAndrew Mahone &defrag_end, range->flags & 1260a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1261940100a4SChris Mason unsigned long next; 1262940100a4SChris Mason /* 1263940100a4SChris Mason * the should_defrag function tells us how much to skip 1264940100a4SChris Mason * bump our counter by the suggested amount 1265940100a4SChris Mason */ 1266940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1267940100a4SChris Mason i = max(i + 1, next); 1268940100a4SChris Mason continue; 1269940100a4SChris Mason } 1270008873eaSLi Zefan 1271008873eaSLi Zefan if (!newer_than) { 1272008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1273008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1274008873eaSLi Zefan cluster = min(cluster, max_cluster); 1275008873eaSLi Zefan } else { 1276008873eaSLi Zefan cluster = max_cluster; 1277008873eaSLi Zefan } 1278008873eaSLi Zefan 1279008873eaSLi Zefan if (i + cluster > ra_index) { 1280008873eaSLi Zefan ra_index = max(i, ra_index); 1281008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1282008873eaSLi Zefan cluster); 1283008873eaSLi Zefan ra_index += max_cluster; 1284008873eaSLi Zefan } 12854cb5300bSChris Mason 1286ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1287633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1288633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1289008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1290ecb8bea8SLiu Bo if (ret < 0) { 1291ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12924cb5300bSChris Mason goto out_ra; 1293ecb8bea8SLiu Bo } 12944cb5300bSChris Mason 12954cb5300bSChris Mason defrag_count += ret; 1296d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1297ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12984cb5300bSChris Mason 12994cb5300bSChris Mason if (newer_than) { 13004cb5300bSChris Mason if (newer_off == (u64)-1) 13014cb5300bSChris Mason break; 13024cb5300bSChris Mason 1303e1f041e1SLiu Bo if (ret > 0) 1304e1f041e1SLiu Bo i += ret; 1305e1f041e1SLiu Bo 13064cb5300bSChris Mason newer_off = max(newer_off + 1, 13074cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13084cb5300bSChris Mason 13094cb5300bSChris Mason ret = find_new_extents(root, inode, 13104cb5300bSChris Mason newer_than, &newer_off, 13114cb5300bSChris Mason 64 * 1024); 13124cb5300bSChris Mason if (!ret) { 13134cb5300bSChris Mason range->start = newer_off; 13144cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13154cb5300bSChris Mason } else { 13164cb5300bSChris Mason break; 1317940100a4SChris Mason } 13184cb5300bSChris Mason } else { 1319008873eaSLi Zefan if (ret > 0) { 1320cbcc8326SLi Zefan i += ret; 1321008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1322008873eaSLi Zefan } else { 1323940100a4SChris Mason i++; 1324008873eaSLi Zefan last_len = 0; 1325008873eaSLi Zefan } 1326f46b5a66SChristoph Hellwig } 13274cb5300bSChris Mason } 1328f46b5a66SChristoph Hellwig 13291e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13301e701a32SChris Mason filemap_flush(inode->i_mapping); 13311e701a32SChris Mason 13321e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13331e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13341e701a32SChris Mason * we have to make sure the IO is actually started and that 13351e701a32SChris Mason * ordered extents get created before we return 13361e701a32SChris Mason */ 13371e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13381e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13391e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13401e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13411e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13421e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13431e701a32SChris Mason } 13441e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13451e701a32SChris Mason } 13461e701a32SChris Mason 13471a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13482b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13491a419d85SLi Zefan } 13501a419d85SLi Zefan 135160ccf82fSDiego Calleja ret = defrag_count; 1352940100a4SChris Mason 13534cb5300bSChris Mason out_ra: 1354633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1355633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1356633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1357633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1358633085c7SFilipe David Borba Manana } 13594cb5300bSChris Mason if (!file) 13604cb5300bSChris Mason kfree(ra); 13614cb5300bSChris Mason kfree(pages); 1362940100a4SChris Mason return ret; 1363f46b5a66SChristoph Hellwig } 1364f46b5a66SChristoph Hellwig 1365198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 136676dda93cSYan, Zheng void __user *arg) 1367f46b5a66SChristoph Hellwig { 1368f46b5a66SChristoph Hellwig u64 new_size; 1369f46b5a66SChristoph Hellwig u64 old_size; 1370f46b5a66SChristoph Hellwig u64 devid = 1; 1371496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1372f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1373f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1374f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1375f46b5a66SChristoph Hellwig char *sizestr; 1376f46b5a66SChristoph Hellwig char *devstr = NULL; 1377f46b5a66SChristoph Hellwig int ret = 0; 1378f46b5a66SChristoph Hellwig int mod = 0; 1379f46b5a66SChristoph Hellwig 1380e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1381e441d54dSChris Mason return -EPERM; 1382e441d54dSChris Mason 1383198605a8SMiao Xie ret = mnt_want_write_file(file); 1384198605a8SMiao Xie if (ret) 1385198605a8SMiao Xie return ret; 1386198605a8SMiao Xie 13875ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13885ac00addSStefan Behrens 1)) { 138997547676SMiao Xie mnt_drop_write_file(file); 1390e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1391c9e9f97bSIlya Dryomov } 1392c9e9f97bSIlya Dryomov 13935ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1394dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1395c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1396c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1397c9e9f97bSIlya Dryomov goto out; 1398c9e9f97bSIlya Dryomov } 13995516e595SMark Fasheh 14005516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1401f46b5a66SChristoph Hellwig 1402f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1403f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1404f46b5a66SChristoph Hellwig if (devstr) { 1405f46b5a66SChristoph Hellwig char *end; 1406f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1407f46b5a66SChristoph Hellwig *devstr = '\0'; 1408f46b5a66SChristoph Hellwig devstr = vol_args->name; 1409f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1410dfd79829SMiao Xie if (!devid) { 1411dfd79829SMiao Xie ret = -EINVAL; 1412dfd79829SMiao Xie goto out_free; 1413dfd79829SMiao Xie } 1414c1c9ff7cSGeert Uytterhoeven printk(KERN_INFO "btrfs: resizing devid %llu\n", devid); 1415f46b5a66SChristoph Hellwig } 1416dba60f3fSMiao Xie 1417aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1418f46b5a66SChristoph Hellwig if (!device) { 14195bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 1420c1c9ff7cSGeert Uytterhoeven devid); 1421dfd79829SMiao Xie ret = -ENODEV; 1422c9e9f97bSIlya Dryomov goto out_free; 1423f46b5a66SChristoph Hellwig } 1424dba60f3fSMiao Xie 1425dba60f3fSMiao Xie if (!device->writeable) { 14264e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1427dba60f3fSMiao Xie "readonly device %llu\n", 1428c1c9ff7cSGeert Uytterhoeven devid); 1429dfd79829SMiao Xie ret = -EPERM; 14304e42ae1bSLiu Bo goto out_free; 14314e42ae1bSLiu Bo } 14324e42ae1bSLiu Bo 1433f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1434f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1435f46b5a66SChristoph Hellwig else { 1436f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1437f46b5a66SChristoph Hellwig mod = -1; 1438f46b5a66SChristoph Hellwig sizestr++; 1439f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1440f46b5a66SChristoph Hellwig mod = 1; 1441f46b5a66SChristoph Hellwig sizestr++; 1442f46b5a66SChristoph Hellwig } 144391748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1444f46b5a66SChristoph Hellwig if (new_size == 0) { 1445f46b5a66SChristoph Hellwig ret = -EINVAL; 1446c9e9f97bSIlya Dryomov goto out_free; 1447f46b5a66SChristoph Hellwig } 1448f46b5a66SChristoph Hellwig } 1449f46b5a66SChristoph Hellwig 145063a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1451dfd79829SMiao Xie ret = -EPERM; 145263a212abSStefan Behrens goto out_free; 145363a212abSStefan Behrens } 145463a212abSStefan Behrens 1455f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1456f46b5a66SChristoph Hellwig 1457f46b5a66SChristoph Hellwig if (mod < 0) { 1458f46b5a66SChristoph Hellwig if (new_size > old_size) { 1459f46b5a66SChristoph Hellwig ret = -EINVAL; 1460c9e9f97bSIlya Dryomov goto out_free; 1461f46b5a66SChristoph Hellwig } 1462f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1463f46b5a66SChristoph Hellwig } else if (mod > 0) { 1464f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1465f46b5a66SChristoph Hellwig } 1466f46b5a66SChristoph Hellwig 1467f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1468f46b5a66SChristoph Hellwig ret = -EINVAL; 1469c9e9f97bSIlya Dryomov goto out_free; 1470f46b5a66SChristoph Hellwig } 1471f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1472f46b5a66SChristoph Hellwig ret = -EFBIG; 1473c9e9f97bSIlya Dryomov goto out_free; 1474f46b5a66SChristoph Hellwig } 1475f46b5a66SChristoph Hellwig 1476f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1477f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1478f46b5a66SChristoph Hellwig 1479606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1480c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1481f46b5a66SChristoph Hellwig 1482f46b5a66SChristoph Hellwig if (new_size > old_size) { 1483a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 148498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 148598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1486c9e9f97bSIlya Dryomov goto out_free; 148798d5dc13STsutomu Itoh } 1488f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1489f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1490ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1491f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14920253f40eSjeff.liu } /* equal, nothing need to do */ 1493f46b5a66SChristoph Hellwig 1494c9e9f97bSIlya Dryomov out_free: 1495f46b5a66SChristoph Hellwig kfree(vol_args); 1496c9e9f97bSIlya Dryomov out: 1497c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 14985ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 149918f39c41SIlya Dryomov mnt_drop_write_file(file); 1500f46b5a66SChristoph Hellwig return ret; 1501f46b5a66SChristoph Hellwig } 1502f46b5a66SChristoph Hellwig 150372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15046f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15056f72c7e2SArne Jansen u64 *transid, bool readonly, 15068696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1507f46b5a66SChristoph Hellwig { 1508f46b5a66SChristoph Hellwig int namelen; 15093de4586cSChris Mason int ret = 0; 1510f46b5a66SChristoph Hellwig 1511a874a63eSLiu Bo ret = mnt_want_write_file(file); 1512a874a63eSLiu Bo if (ret) 1513a874a63eSLiu Bo goto out; 1514a874a63eSLiu Bo 151572fd032eSSage Weil namelen = strlen(name); 151672fd032eSSage Weil if (strchr(name, '/')) { 1517f46b5a66SChristoph Hellwig ret = -EINVAL; 1518a874a63eSLiu Bo goto out_drop_write; 1519f46b5a66SChristoph Hellwig } 1520f46b5a66SChristoph Hellwig 152116780cabSChris Mason if (name[0] == '.' && 152216780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 152316780cabSChris Mason ret = -EEXIST; 1524a874a63eSLiu Bo goto out_drop_write; 152516780cabSChris Mason } 152616780cabSChris Mason 15273de4586cSChris Mason if (subvol) { 152872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15296f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1530cb8e7090SChristoph Hellwig } else { 15312903ff01SAl Viro struct fd src = fdget(fd); 15323de4586cSChris Mason struct inode *src_inode; 15332903ff01SAl Viro if (!src.file) { 15343de4586cSChris Mason ret = -EINVAL; 1535a874a63eSLiu Bo goto out_drop_write; 15363de4586cSChris Mason } 15373de4586cSChris Mason 1538496ad9aaSAl Viro src_inode = file_inode(src.file); 1539496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1540d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1541d397712bSChris Mason "another FS\n"); 15423de4586cSChris Mason ret = -EINVAL; 1543ecd18815SAl Viro } else { 154472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 154572fd032eSSage Weil BTRFS_I(src_inode)->root, 15466f72c7e2SArne Jansen transid, readonly, inherit); 1547ecd18815SAl Viro } 15482903ff01SAl Viro fdput(src); 1549cb8e7090SChristoph Hellwig } 1550a874a63eSLiu Bo out_drop_write: 1551a874a63eSLiu Bo mnt_drop_write_file(file); 1552f46b5a66SChristoph Hellwig out: 155372fd032eSSage Weil return ret; 155472fd032eSSage Weil } 155572fd032eSSage Weil 155672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1557fa0d2b9bSLi Zefan void __user *arg, int subvol) 155872fd032eSSage Weil { 1559fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 156072fd032eSSage Weil int ret; 156172fd032eSSage Weil 1562fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1563fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1564fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1565fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1566fa0d2b9bSLi Zefan 1567fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1568b83cc969SLi Zefan vol_args->fd, subvol, 15696f72c7e2SArne Jansen NULL, false, NULL); 1570fa0d2b9bSLi Zefan 1571fa0d2b9bSLi Zefan kfree(vol_args); 1572fa0d2b9bSLi Zefan return ret; 1573fa0d2b9bSLi Zefan } 1574fa0d2b9bSLi Zefan 1575fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1576fa0d2b9bSLi Zefan void __user *arg, int subvol) 1577fa0d2b9bSLi Zefan { 1578fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1579fa0d2b9bSLi Zefan int ret; 1580fdfb1e4fSLi Zefan u64 transid = 0; 1581fdfb1e4fSLi Zefan u64 *ptr = NULL; 1582b83cc969SLi Zefan bool readonly = false; 15836f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 158472fd032eSSage Weil 1585fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1586fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1587fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1588fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1589fdfb1e4fSLi Zefan 1590b83cc969SLi Zefan if (vol_args->flags & 15916f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15926f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1593b83cc969SLi Zefan ret = -EOPNOTSUPP; 1594fdfb1e4fSLi Zefan goto out; 1595fdfb1e4fSLi Zefan } 1596fdfb1e4fSLi Zefan 1597fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1598fdfb1e4fSLi Zefan ptr = &transid; 1599b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1600b83cc969SLi Zefan readonly = true; 16016f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16026f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16036f72c7e2SArne Jansen ret = -EINVAL; 16046f72c7e2SArne Jansen goto out; 16056f72c7e2SArne Jansen } 16066f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16076f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16086f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16096f72c7e2SArne Jansen goto out; 16106f72c7e2SArne Jansen } 16116f72c7e2SArne Jansen } 161275eaa0e2SSage Weil 1613fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16146f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16158696c533SMiao Xie readonly, inherit); 161675eaa0e2SSage Weil 1617fdfb1e4fSLi Zefan if (ret == 0 && ptr && 161875eaa0e2SSage Weil copy_to_user(arg + 1619fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1620fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 162175eaa0e2SSage Weil ret = -EFAULT; 1622fdfb1e4fSLi Zefan out: 1623f46b5a66SChristoph Hellwig kfree(vol_args); 16246f72c7e2SArne Jansen kfree(inherit); 1625f46b5a66SChristoph Hellwig return ret; 1626f46b5a66SChristoph Hellwig } 1627f46b5a66SChristoph Hellwig 16280caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16290caa102dSLi Zefan void __user *arg) 16300caa102dSLi Zefan { 1631496ad9aaSAl Viro struct inode *inode = file_inode(file); 16320caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16330caa102dSLi Zefan int ret = 0; 16340caa102dSLi Zefan u64 flags = 0; 16350caa102dSLi Zefan 163633345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16370caa102dSLi Zefan return -EINVAL; 16380caa102dSLi Zefan 16390caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16400caa102dSLi Zefan if (btrfs_root_readonly(root)) 16410caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16420caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16430caa102dSLi Zefan 16440caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16450caa102dSLi Zefan ret = -EFAULT; 16460caa102dSLi Zefan 16470caa102dSLi Zefan return ret; 16480caa102dSLi Zefan } 16490caa102dSLi Zefan 16500caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16510caa102dSLi Zefan void __user *arg) 16520caa102dSLi Zefan { 1653496ad9aaSAl Viro struct inode *inode = file_inode(file); 16540caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16550caa102dSLi Zefan struct btrfs_trans_handle *trans; 16560caa102dSLi Zefan u64 root_flags; 16570caa102dSLi Zefan u64 flags; 16580caa102dSLi Zefan int ret = 0; 16590caa102dSLi Zefan 1660b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1661b9ca0664SLiu Bo if (ret) 1662b9ca0664SLiu Bo goto out; 16630caa102dSLi Zefan 1664b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1665b9ca0664SLiu Bo ret = -EINVAL; 1666b9ca0664SLiu Bo goto out_drop_write; 1667b9ca0664SLiu Bo } 16680caa102dSLi Zefan 1669b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1670b9ca0664SLiu Bo ret = -EFAULT; 1671b9ca0664SLiu Bo goto out_drop_write; 1672b9ca0664SLiu Bo } 16730caa102dSLi Zefan 1674b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1675b9ca0664SLiu Bo ret = -EINVAL; 1676b9ca0664SLiu Bo goto out_drop_write; 1677b9ca0664SLiu Bo } 16780caa102dSLi Zefan 1679b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1680b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1681b9ca0664SLiu Bo goto out_drop_write; 1682b9ca0664SLiu Bo } 16830caa102dSLi Zefan 1684b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1685b9ca0664SLiu Bo ret = -EACCES; 1686b9ca0664SLiu Bo goto out_drop_write; 1687b9ca0664SLiu Bo } 1688b4dc2b8cSLi Zefan 16890caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16900caa102dSLi Zefan 16910caa102dSLi Zefan /* nothing to do */ 16920caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1693b9ca0664SLiu Bo goto out_drop_sem; 16940caa102dSLi Zefan 16950caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 16960caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 16970caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16980caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 16990caa102dSLi Zefan else 17000caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17010caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17020caa102dSLi Zefan 17030caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17040caa102dSLi Zefan if (IS_ERR(trans)) { 17050caa102dSLi Zefan ret = PTR_ERR(trans); 17060caa102dSLi Zefan goto out_reset; 17070caa102dSLi Zefan } 17080caa102dSLi Zefan 1709b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17100caa102dSLi Zefan &root->root_key, &root->root_item); 17110caa102dSLi Zefan 17120caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17130caa102dSLi Zefan out_reset: 17140caa102dSLi Zefan if (ret) 17150caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1716b9ca0664SLiu Bo out_drop_sem: 17170caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1718b9ca0664SLiu Bo out_drop_write: 1719b9ca0664SLiu Bo mnt_drop_write_file(file); 1720b9ca0664SLiu Bo out: 17210caa102dSLi Zefan return ret; 17220caa102dSLi Zefan } 17230caa102dSLi Zefan 172476dda93cSYan, Zheng /* 172576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 172676dda93cSYan, Zheng */ 172776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 172876dda93cSYan, Zheng { 172976dda93cSYan, Zheng struct btrfs_path *path; 1730175a2b87SJosef Bacik struct btrfs_dir_item *di; 173176dda93cSYan, Zheng struct btrfs_key key; 1732175a2b87SJosef Bacik u64 dir_id; 173376dda93cSYan, Zheng int ret; 173476dda93cSYan, Zheng 173576dda93cSYan, Zheng path = btrfs_alloc_path(); 173676dda93cSYan, Zheng if (!path) 173776dda93cSYan, Zheng return -ENOMEM; 173876dda93cSYan, Zheng 1739175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1740175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1741175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1742175a2b87SJosef Bacik dir_id, "default", 7, 0); 1743175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1744175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1745175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1746175a2b87SJosef Bacik ret = -ENOTEMPTY; 1747175a2b87SJosef Bacik goto out; 1748175a2b87SJosef Bacik } 1749175a2b87SJosef Bacik btrfs_release_path(path); 1750175a2b87SJosef Bacik } 1751175a2b87SJosef Bacik 175276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 175376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 175476dda93cSYan, Zheng key.offset = (u64)-1; 175576dda93cSYan, Zheng 175676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 175776dda93cSYan, Zheng &key, path, 0, 0); 175876dda93cSYan, Zheng if (ret < 0) 175976dda93cSYan, Zheng goto out; 176076dda93cSYan, Zheng BUG_ON(ret == 0); 176176dda93cSYan, Zheng 176276dda93cSYan, Zheng ret = 0; 176376dda93cSYan, Zheng if (path->slots[0] > 0) { 176476dda93cSYan, Zheng path->slots[0]--; 176576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 176676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 176776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 176876dda93cSYan, Zheng ret = -ENOTEMPTY; 176976dda93cSYan, Zheng } 177076dda93cSYan, Zheng out: 177176dda93cSYan, Zheng btrfs_free_path(path); 177276dda93cSYan, Zheng return ret; 177376dda93cSYan, Zheng } 177476dda93cSYan, Zheng 1775ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1776ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1777ac8e9819SChris Mason { 1778abc6e134SChris Mason struct btrfs_key test; 1779abc6e134SChris Mason int ret; 1780abc6e134SChris Mason 1781abc6e134SChris Mason test.objectid = sk->min_objectid; 1782abc6e134SChris Mason test.type = sk->min_type; 1783abc6e134SChris Mason test.offset = sk->min_offset; 1784abc6e134SChris Mason 1785abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1786abc6e134SChris Mason if (ret < 0) 1787ac8e9819SChris Mason return 0; 1788abc6e134SChris Mason 1789abc6e134SChris Mason test.objectid = sk->max_objectid; 1790abc6e134SChris Mason test.type = sk->max_type; 1791abc6e134SChris Mason test.offset = sk->max_offset; 1792abc6e134SChris Mason 1793abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1794abc6e134SChris Mason if (ret > 0) 1795ac8e9819SChris Mason return 0; 1796ac8e9819SChris Mason return 1; 1797ac8e9819SChris Mason } 1798ac8e9819SChris Mason 1799ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1800ac8e9819SChris Mason struct btrfs_path *path, 1801ac8e9819SChris Mason struct btrfs_key *key, 1802ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1803ac8e9819SChris Mason char *buf, 1804ac8e9819SChris Mason unsigned long *sk_offset, 1805ac8e9819SChris Mason int *num_found) 1806ac8e9819SChris Mason { 1807ac8e9819SChris Mason u64 found_transid; 1808ac8e9819SChris Mason struct extent_buffer *leaf; 1809ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1810ac8e9819SChris Mason unsigned long item_off; 1811ac8e9819SChris Mason unsigned long item_len; 1812ac8e9819SChris Mason int nritems; 1813ac8e9819SChris Mason int i; 1814ac8e9819SChris Mason int slot; 1815ac8e9819SChris Mason int ret = 0; 1816ac8e9819SChris Mason 1817ac8e9819SChris Mason leaf = path->nodes[0]; 1818ac8e9819SChris Mason slot = path->slots[0]; 1819ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1820ac8e9819SChris Mason 1821ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1822ac8e9819SChris Mason i = nritems; 1823ac8e9819SChris Mason goto advance_key; 1824ac8e9819SChris Mason } 1825ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1826ac8e9819SChris Mason 1827ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1828ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1829ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1830ac8e9819SChris Mason 183103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 183203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 183303b71c6cSGabriel de Perthuis continue; 183403b71c6cSGabriel de Perthuis 183503b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1836ac8e9819SChris Mason item_len = 0; 1837ac8e9819SChris Mason 1838ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1839ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1840ac8e9819SChris Mason ret = 1; 1841ac8e9819SChris Mason goto overflow; 1842ac8e9819SChris Mason } 1843ac8e9819SChris Mason 1844ac8e9819SChris Mason sh.objectid = key->objectid; 1845ac8e9819SChris Mason sh.offset = key->offset; 1846ac8e9819SChris Mason sh.type = key->type; 1847ac8e9819SChris Mason sh.len = item_len; 1848ac8e9819SChris Mason sh.transid = found_transid; 1849ac8e9819SChris Mason 1850ac8e9819SChris Mason /* copy search result header */ 1851ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1852ac8e9819SChris Mason *sk_offset += sizeof(sh); 1853ac8e9819SChris Mason 1854ac8e9819SChris Mason if (item_len) { 1855ac8e9819SChris Mason char *p = buf + *sk_offset; 1856ac8e9819SChris Mason /* copy the item */ 1857ac8e9819SChris Mason read_extent_buffer(leaf, p, 1858ac8e9819SChris Mason item_off, item_len); 1859ac8e9819SChris Mason *sk_offset += item_len; 1860ac8e9819SChris Mason } 1861e2156867SHugo Mills (*num_found)++; 1862ac8e9819SChris Mason 1863ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1864ac8e9819SChris Mason break; 1865ac8e9819SChris Mason } 1866ac8e9819SChris Mason advance_key: 1867ac8e9819SChris Mason ret = 0; 1868abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1869abc6e134SChris Mason key->offset++; 1870abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1871abc6e134SChris Mason key->offset = 0; 1872abc6e134SChris Mason key->type++; 1873abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1874abc6e134SChris Mason key->offset = 0; 1875abc6e134SChris Mason key->type = 0; 1876abc6e134SChris Mason key->objectid++; 1877abc6e134SChris Mason } else 1878abc6e134SChris Mason ret = 1; 1879ac8e9819SChris Mason overflow: 1880ac8e9819SChris Mason return ret; 1881ac8e9819SChris Mason } 1882ac8e9819SChris Mason 1883ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1884ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1885ac8e9819SChris Mason { 1886ac8e9819SChris Mason struct btrfs_root *root; 1887ac8e9819SChris Mason struct btrfs_key key; 1888ac8e9819SChris Mason struct btrfs_path *path; 1889ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1890ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1891ac8e9819SChris Mason int ret; 1892ac8e9819SChris Mason int num_found = 0; 1893ac8e9819SChris Mason unsigned long sk_offset = 0; 1894ac8e9819SChris Mason 1895ac8e9819SChris Mason path = btrfs_alloc_path(); 1896ac8e9819SChris Mason if (!path) 1897ac8e9819SChris Mason return -ENOMEM; 1898ac8e9819SChris Mason 1899ac8e9819SChris Mason if (sk->tree_id == 0) { 1900ac8e9819SChris Mason /* search the root of the inode that was passed */ 1901ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1902ac8e9819SChris Mason } else { 1903ac8e9819SChris Mason key.objectid = sk->tree_id; 1904ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1905ac8e9819SChris Mason key.offset = (u64)-1; 1906ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1907ac8e9819SChris Mason if (IS_ERR(root)) { 1908ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1909ac8e9819SChris Mason sk->tree_id); 1910ac8e9819SChris Mason btrfs_free_path(path); 1911ac8e9819SChris Mason return -ENOENT; 1912ac8e9819SChris Mason } 1913ac8e9819SChris Mason } 1914ac8e9819SChris Mason 1915ac8e9819SChris Mason key.objectid = sk->min_objectid; 1916ac8e9819SChris Mason key.type = sk->min_type; 1917ac8e9819SChris Mason key.offset = sk->min_offset; 1918ac8e9819SChris Mason 1919ac8e9819SChris Mason path->keep_locks = 1; 1920ac8e9819SChris Mason 1921ac8e9819SChris Mason while(1) { 19226174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1923ac8e9819SChris Mason if (ret != 0) { 1924ac8e9819SChris Mason if (ret > 0) 1925ac8e9819SChris Mason ret = 0; 1926ac8e9819SChris Mason goto err; 1927ac8e9819SChris Mason } 1928ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1929ac8e9819SChris Mason &sk_offset, &num_found); 1930b3b4aa74SDavid Sterba btrfs_release_path(path); 1931ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1932ac8e9819SChris Mason break; 1933ac8e9819SChris Mason 1934ac8e9819SChris Mason } 1935ac8e9819SChris Mason ret = 0; 1936ac8e9819SChris Mason err: 1937ac8e9819SChris Mason sk->nr_items = num_found; 1938ac8e9819SChris Mason btrfs_free_path(path); 1939ac8e9819SChris Mason return ret; 1940ac8e9819SChris Mason } 1941ac8e9819SChris Mason 1942ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1943ac8e9819SChris Mason void __user *argp) 1944ac8e9819SChris Mason { 1945ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1946ac8e9819SChris Mason struct inode *inode; 1947ac8e9819SChris Mason int ret; 1948ac8e9819SChris Mason 1949ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1950ac8e9819SChris Mason return -EPERM; 1951ac8e9819SChris Mason 19522354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19532354d08fSJulia Lawall if (IS_ERR(args)) 19542354d08fSJulia Lawall return PTR_ERR(args); 1955ac8e9819SChris Mason 1956496ad9aaSAl Viro inode = file_inode(file); 1957ac8e9819SChris Mason ret = search_ioctl(inode, args); 1958ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1959ac8e9819SChris Mason ret = -EFAULT; 1960ac8e9819SChris Mason kfree(args); 1961ac8e9819SChris Mason return ret; 1962ac8e9819SChris Mason } 1963ac8e9819SChris Mason 196498d377a0STARUISI Hiroaki /* 1965ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1966ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 196798d377a0STARUISI Hiroaki */ 196898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 196998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 197098d377a0STARUISI Hiroaki { 197198d377a0STARUISI Hiroaki struct btrfs_root *root; 197298d377a0STARUISI Hiroaki struct btrfs_key key; 1973ac8e9819SChris Mason char *ptr; 197498d377a0STARUISI Hiroaki int ret = -1; 197598d377a0STARUISI Hiroaki int slot; 197698d377a0STARUISI Hiroaki int len; 197798d377a0STARUISI Hiroaki int total_len = 0; 197898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 197998d377a0STARUISI Hiroaki struct extent_buffer *l; 198098d377a0STARUISI Hiroaki struct btrfs_path *path; 198198d377a0STARUISI Hiroaki 198298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 198398d377a0STARUISI Hiroaki name[0]='\0'; 198498d377a0STARUISI Hiroaki return 0; 198598d377a0STARUISI Hiroaki } 198698d377a0STARUISI Hiroaki 198798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 198898d377a0STARUISI Hiroaki if (!path) 198998d377a0STARUISI Hiroaki return -ENOMEM; 199098d377a0STARUISI Hiroaki 1991ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 199298d377a0STARUISI Hiroaki 199398d377a0STARUISI Hiroaki key.objectid = tree_id; 199498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 199598d377a0STARUISI Hiroaki key.offset = (u64)-1; 199698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 199798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 199898d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 19998ad6fcabSChris Mason ret = -ENOENT; 20008ad6fcabSChris Mason goto out; 200198d377a0STARUISI Hiroaki } 200298d377a0STARUISI Hiroaki 200398d377a0STARUISI Hiroaki key.objectid = dirid; 200498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20058ad6fcabSChris Mason key.offset = (u64)-1; 200698d377a0STARUISI Hiroaki 200798d377a0STARUISI Hiroaki while(1) { 200898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 200998d377a0STARUISI Hiroaki if (ret < 0) 201098d377a0STARUISI Hiroaki goto out; 201118674c6cSFilipe David Borba Manana else if (ret > 0) { 201218674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 201318674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 201418674c6cSFilipe David Borba Manana if (ret < 0) 201518674c6cSFilipe David Borba Manana goto out; 201618674c6cSFilipe David Borba Manana else if (ret > 0) { 2017ac8e9819SChris Mason ret = -ENOENT; 201898d377a0STARUISI Hiroaki goto out; 2019ac8e9819SChris Mason } 202018674c6cSFilipe David Borba Manana } 202118674c6cSFilipe David Borba Manana 202218674c6cSFilipe David Borba Manana l = path->nodes[0]; 202318674c6cSFilipe David Borba Manana slot = path->slots[0]; 202418674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 202598d377a0STARUISI Hiroaki 202698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 202798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 202898d377a0STARUISI Hiroaki ptr -= len + 1; 202998d377a0STARUISI Hiroaki total_len += len + 1; 2030a696cf35SFilipe David Borba Manana if (ptr < name) { 2031a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 203298d377a0STARUISI Hiroaki goto out; 2033a696cf35SFilipe David Borba Manana } 203498d377a0STARUISI Hiroaki 203598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 203698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 203798d377a0STARUISI Hiroaki 203898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 203998d377a0STARUISI Hiroaki break; 204098d377a0STARUISI Hiroaki 2041b3b4aa74SDavid Sterba btrfs_release_path(path); 204298d377a0STARUISI Hiroaki key.objectid = key.offset; 20438ad6fcabSChris Mason key.offset = (u64)-1; 204498d377a0STARUISI Hiroaki dirid = key.objectid; 204598d377a0STARUISI Hiroaki } 204677906a50SLi Zefan memmove(name, ptr, total_len); 204798d377a0STARUISI Hiroaki name[total_len]='\0'; 204898d377a0STARUISI Hiroaki ret = 0; 204998d377a0STARUISI Hiroaki out: 205098d377a0STARUISI Hiroaki btrfs_free_path(path); 2051ac8e9819SChris Mason return ret; 2052ac8e9819SChris Mason } 2053ac8e9819SChris Mason 2054ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2055ac8e9819SChris Mason void __user *argp) 2056ac8e9819SChris Mason { 2057ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2058ac8e9819SChris Mason struct inode *inode; 2059ac8e9819SChris Mason int ret; 2060ac8e9819SChris Mason 2061ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2062ac8e9819SChris Mason return -EPERM; 2063ac8e9819SChris Mason 20642354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20652354d08fSJulia Lawall if (IS_ERR(args)) 20662354d08fSJulia Lawall return PTR_ERR(args); 2067c2b96929SDan Carpenter 2068496ad9aaSAl Viro inode = file_inode(file); 2069ac8e9819SChris Mason 20701b53ac4dSChris Mason if (args->treeid == 0) 20711b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20721b53ac4dSChris Mason 2073ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2074ac8e9819SChris Mason args->treeid, args->objectid, 2075ac8e9819SChris Mason args->name); 2076ac8e9819SChris Mason 2077ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2078ac8e9819SChris Mason ret = -EFAULT; 2079ac8e9819SChris Mason 2080ac8e9819SChris Mason kfree(args); 208198d377a0STARUISI Hiroaki return ret; 208298d377a0STARUISI Hiroaki } 208398d377a0STARUISI Hiroaki 208476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 208576dda93cSYan, Zheng void __user *arg) 208676dda93cSYan, Zheng { 208776dda93cSYan, Zheng struct dentry *parent = fdentry(file); 208876dda93cSYan, Zheng struct dentry *dentry; 208976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 209076dda93cSYan, Zheng struct inode *inode; 209176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 209276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 209376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 209476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2095c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2096c58aaad2SMiao Xie u64 qgroup_reserved; 209776dda93cSYan, Zheng int namelen; 209876dda93cSYan, Zheng int ret; 209976dda93cSYan, Zheng int err = 0; 210076dda93cSYan, Zheng 210176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 210276dda93cSYan, Zheng if (IS_ERR(vol_args)) 210376dda93cSYan, Zheng return PTR_ERR(vol_args); 210476dda93cSYan, Zheng 210576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 210676dda93cSYan, Zheng namelen = strlen(vol_args->name); 210776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 210876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 210976dda93cSYan, Zheng err = -EINVAL; 211076dda93cSYan, Zheng goto out; 211176dda93cSYan, Zheng } 211276dda93cSYan, Zheng 2113a561be71SAl Viro err = mnt_want_write_file(file); 211476dda93cSYan, Zheng if (err) 211576dda93cSYan, Zheng goto out; 211676dda93cSYan, Zheng 21175c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21185c50c9b8SDavid Sterba if (err == -EINTR) 21195c50c9b8SDavid Sterba goto out; 212076dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 212176dda93cSYan, Zheng if (IS_ERR(dentry)) { 212276dda93cSYan, Zheng err = PTR_ERR(dentry); 212376dda93cSYan, Zheng goto out_unlock_dir; 212476dda93cSYan, Zheng } 212576dda93cSYan, Zheng 212676dda93cSYan, Zheng if (!dentry->d_inode) { 212776dda93cSYan, Zheng err = -ENOENT; 212876dda93cSYan, Zheng goto out_dput; 212976dda93cSYan, Zheng } 213076dda93cSYan, Zheng 213176dda93cSYan, Zheng inode = dentry->d_inode; 21324260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21334260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 21344260f7c7SSage Weil /* 21354260f7c7SSage Weil * Regular user. Only allow this with a special mount 21364260f7c7SSage Weil * option, when the user has write+exec access to the 21374260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21384260f7c7SSage Weil * allowed. 21394260f7c7SSage Weil * 21404260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21414260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21424260f7c7SSage Weil * otherwise be able to delete. 21434260f7c7SSage Weil * 21444260f7c7SSage Weil * Users who want to delete empty subvols should try 21454260f7c7SSage Weil * rmdir(2). 21464260f7c7SSage Weil */ 21474260f7c7SSage Weil err = -EPERM; 21484260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21494260f7c7SSage Weil goto out_dput; 21504260f7c7SSage Weil 21514260f7c7SSage Weil /* 21524260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21534260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21544260f7c7SSage Weil * must be called on the dentry referencing the root 21554260f7c7SSage Weil * of the subvol, not a random directory contained 21564260f7c7SSage Weil * within it. 21574260f7c7SSage Weil */ 21584260f7c7SSage Weil err = -EINVAL; 21594260f7c7SSage Weil if (root == dest) 21604260f7c7SSage Weil goto out_dput; 21614260f7c7SSage Weil 21624260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21634260f7c7SSage Weil if (err) 21644260f7c7SSage Weil goto out_dput; 21655c39da5bSMiao Xie } 21664260f7c7SSage Weil 21675c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21684260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21694260f7c7SSage Weil if (err) 21704260f7c7SSage Weil goto out_dput; 21714260f7c7SSage Weil 217233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 217376dda93cSYan, Zheng err = -EINVAL; 217476dda93cSYan, Zheng goto out_dput; 217576dda93cSYan, Zheng } 217676dda93cSYan, Zheng 217776dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 217876dda93cSYan, Zheng err = d_invalidate(dentry); 217976dda93cSYan, Zheng if (err) 218076dda93cSYan, Zheng goto out_unlock; 218176dda93cSYan, Zheng 218276dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 218376dda93cSYan, Zheng 218476dda93cSYan, Zheng err = may_destroy_subvol(dest); 218576dda93cSYan, Zheng if (err) 218676dda93cSYan, Zheng goto out_up_write; 218776dda93cSYan, Zheng 2188c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2189c58aaad2SMiao Xie /* 2190c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2191c58aaad2SMiao Xie * ref/backref. 2192c58aaad2SMiao Xie */ 2193c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2194ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2195c58aaad2SMiao Xie if (err) 2196c58aaad2SMiao Xie goto out_up_write; 2197c58aaad2SMiao Xie 2198a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2199a22285a6SYan, Zheng if (IS_ERR(trans)) { 2200a22285a6SYan, Zheng err = PTR_ERR(trans); 2201c58aaad2SMiao Xie goto out_release; 2202a22285a6SYan, Zheng } 2203c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2204c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2205a22285a6SYan, Zheng 220676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 220776dda93cSYan, Zheng dest->root_key.objectid, 220876dda93cSYan, Zheng dentry->d_name.name, 220976dda93cSYan, Zheng dentry->d_name.len); 221079787eaaSJeff Mahoney if (ret) { 221179787eaaSJeff Mahoney err = ret; 221279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 221379787eaaSJeff Mahoney goto out_end_trans; 221479787eaaSJeff Mahoney } 221576dda93cSYan, Zheng 221676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 221776dda93cSYan, Zheng 221876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 221976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 222076dda93cSYan, Zheng dest->root_item.drop_level = 0; 222176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 222276dda93cSYan, Zheng 2223d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 222476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 222576dda93cSYan, Zheng root->fs_info->tree_root, 222676dda93cSYan, Zheng dest->root_key.objectid); 222779787eaaSJeff Mahoney if (ret) { 222879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 222979787eaaSJeff Mahoney err = ret; 223079787eaaSJeff Mahoney goto out_end_trans; 2231d68fc57bSYan, Zheng } 223279787eaaSJeff Mahoney } 2233dd5f9615SStefan Behrens 2234dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2235dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2236dd5f9615SStefan Behrens dest->root_key.objectid); 2237dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2238dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2239dd5f9615SStefan Behrens err = ret; 2240dd5f9615SStefan Behrens goto out_end_trans; 2241dd5f9615SStefan Behrens } 2242dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2243dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2244dd5f9615SStefan Behrens dest->root_item.received_uuid, 2245dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2246dd5f9615SStefan Behrens dest->root_key.objectid); 2247dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2248dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2249dd5f9615SStefan Behrens err = ret; 2250dd5f9615SStefan Behrens goto out_end_trans; 2251dd5f9615SStefan Behrens } 2252dd5f9615SStefan Behrens } 2253dd5f9615SStefan Behrens 225479787eaaSJeff Mahoney out_end_trans: 2255c58aaad2SMiao Xie trans->block_rsv = NULL; 2256c58aaad2SMiao Xie trans->bytes_reserved = 0; 2257531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 225879787eaaSJeff Mahoney if (ret && !err) 225979787eaaSJeff Mahoney err = ret; 226076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2261c58aaad2SMiao Xie out_release: 2262c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 226376dda93cSYan, Zheng out_up_write: 226476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 226576dda93cSYan, Zheng out_unlock: 226676dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 226776dda93cSYan, Zheng if (!err) { 2268efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 226976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 227076dda93cSYan, Zheng d_delete(dentry); 2271fa6ac876SLiu Bo 2272fa6ac876SLiu Bo /* the last ref */ 2273fa6ac876SLiu Bo if (dest->cache_inode) { 2274fa6ac876SLiu Bo iput(dest->cache_inode); 2275fa6ac876SLiu Bo dest->cache_inode = NULL; 2276fa6ac876SLiu Bo } 227776dda93cSYan, Zheng } 227876dda93cSYan, Zheng out_dput: 227976dda93cSYan, Zheng dput(dentry); 228076dda93cSYan, Zheng out_unlock_dir: 228176dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 22822a79f17eSAl Viro mnt_drop_write_file(file); 228376dda93cSYan, Zheng out: 228476dda93cSYan, Zheng kfree(vol_args); 228576dda93cSYan, Zheng return err; 228676dda93cSYan, Zheng } 228776dda93cSYan, Zheng 22881e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2289f46b5a66SChristoph Hellwig { 2290496ad9aaSAl Viro struct inode *inode = file_inode(file); 2291f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22921e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2293c146afadSYan Zheng int ret; 2294c146afadSYan Zheng 229525122d15SIlya Dryomov ret = mnt_want_write_file(file); 229625122d15SIlya Dryomov if (ret) 229725122d15SIlya Dryomov return ret; 2298b83cc969SLi Zefan 229925122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 230025122d15SIlya Dryomov ret = -EROFS; 230125122d15SIlya Dryomov goto out; 23025ac00addSStefan Behrens } 2303f46b5a66SChristoph Hellwig 2304f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2305f46b5a66SChristoph Hellwig case S_IFDIR: 2306e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2307e441d54dSChris Mason ret = -EPERM; 2308e441d54dSChris Mason goto out; 2309e441d54dSChris Mason } 2310de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23118929ecfaSYan, Zheng if (ret) 23128929ecfaSYan, Zheng goto out; 2313de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2314f46b5a66SChristoph Hellwig break; 2315f46b5a66SChristoph Hellwig case S_IFREG: 2316e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2317e441d54dSChris Mason ret = -EINVAL; 2318e441d54dSChris Mason goto out; 2319e441d54dSChris Mason } 23201e701a32SChris Mason 23211e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 23221e701a32SChris Mason if (!range) { 23231e701a32SChris Mason ret = -ENOMEM; 23241e701a32SChris Mason goto out; 23251e701a32SChris Mason } 23261e701a32SChris Mason 23271e701a32SChris Mason if (argp) { 23281e701a32SChris Mason if (copy_from_user(range, argp, 23291e701a32SChris Mason sizeof(*range))) { 23301e701a32SChris Mason ret = -EFAULT; 23311e701a32SChris Mason kfree(range); 2332683be16eSDan Carpenter goto out; 23331e701a32SChris Mason } 23341e701a32SChris Mason /* compression requires us to start the IO */ 23351e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 23361e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 23371e701a32SChris Mason range->extent_thresh = (u32)-1; 23381e701a32SChris Mason } 23391e701a32SChris Mason } else { 23401e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23411e701a32SChris Mason range->len = (u64)-1; 23421e701a32SChris Mason } 2343496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23444cb5300bSChris Mason range, 0, 0); 23454cb5300bSChris Mason if (ret > 0) 23464cb5300bSChris Mason ret = 0; 23471e701a32SChris Mason kfree(range); 2348f46b5a66SChristoph Hellwig break; 23498929ecfaSYan, Zheng default: 23508929ecfaSYan, Zheng ret = -EINVAL; 2351f46b5a66SChristoph Hellwig } 2352e441d54dSChris Mason out: 235325122d15SIlya Dryomov mnt_drop_write_file(file); 2354e441d54dSChris Mason return ret; 2355f46b5a66SChristoph Hellwig } 2356f46b5a66SChristoph Hellwig 2357b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2358f46b5a66SChristoph Hellwig { 2359f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2360f46b5a66SChristoph Hellwig int ret; 2361f46b5a66SChristoph Hellwig 2362e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2363e441d54dSChris Mason return -EPERM; 2364e441d54dSChris Mason 23655ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23665ac00addSStefan Behrens 1)) { 2367e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2368c9e9f97bSIlya Dryomov } 2369c9e9f97bSIlya Dryomov 23705ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2371dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2372c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2373c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2374c9e9f97bSIlya Dryomov goto out; 2375c9e9f97bSIlya Dryomov } 2376f46b5a66SChristoph Hellwig 23775516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2378f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2379f46b5a66SChristoph Hellwig 2380f46b5a66SChristoph Hellwig kfree(vol_args); 2381c9e9f97bSIlya Dryomov out: 2382c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23835ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2384f46b5a66SChristoph Hellwig return ret; 2385f46b5a66SChristoph Hellwig } 2386f46b5a66SChristoph Hellwig 2387da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2388f46b5a66SChristoph Hellwig { 2389496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2390f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2391f46b5a66SChristoph Hellwig int ret; 2392f46b5a66SChristoph Hellwig 2393e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2394e441d54dSChris Mason return -EPERM; 2395e441d54dSChris Mason 2396da24927bSMiao Xie ret = mnt_want_write_file(file); 2397da24927bSMiao Xie if (ret) 2398da24927bSMiao Xie return ret; 2399c146afadSYan Zheng 2400dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2401c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2402c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2403c9e9f97bSIlya Dryomov goto out; 2404c9e9f97bSIlya Dryomov } 2405f46b5a66SChristoph Hellwig 24065516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2407f46b5a66SChristoph Hellwig 2408183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2409183860f6SAnand Jain 1)) { 2410183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2411183860f6SAnand Jain goto out; 2412183860f6SAnand Jain } 2413183860f6SAnand Jain 2414183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2415183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2416c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24175ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2418183860f6SAnand Jain 2419183860f6SAnand Jain out: 2420183860f6SAnand Jain kfree(vol_args); 24214ac20c70SIlya Dryomov mnt_drop_write_file(file); 2422f46b5a66SChristoph Hellwig return ret; 2423f46b5a66SChristoph Hellwig } 2424f46b5a66SChristoph Hellwig 2425475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2426475f6387SJan Schmidt { 2427027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2428475f6387SJan Schmidt struct btrfs_device *device; 2429475f6387SJan Schmidt struct btrfs_device *next; 2430475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2431027ed2f0SLi Zefan int ret = 0; 2432475f6387SJan Schmidt 2433475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2434475f6387SJan Schmidt return -EPERM; 2435475f6387SJan Schmidt 2436027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2437027ed2f0SLi Zefan if (!fi_args) 2438027ed2f0SLi Zefan return -ENOMEM; 2439027ed2f0SLi Zefan 2440f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2441027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2442027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2443475f6387SJan Schmidt 2444475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2445027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2446027ed2f0SLi Zefan fi_args->max_id = device->devid; 2447475f6387SJan Schmidt } 2448475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2449475f6387SJan Schmidt 2450027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2451027ed2f0SLi Zefan ret = -EFAULT; 2452475f6387SJan Schmidt 2453027ed2f0SLi Zefan kfree(fi_args); 2454027ed2f0SLi Zefan return ret; 2455475f6387SJan Schmidt } 2456475f6387SJan Schmidt 2457475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2458475f6387SJan Schmidt { 2459475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2460475f6387SJan Schmidt struct btrfs_device *dev; 2461475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2462475f6387SJan Schmidt int ret = 0; 2463475f6387SJan Schmidt char *s_uuid = NULL; 2464475f6387SJan Schmidt 2465475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2466475f6387SJan Schmidt return -EPERM; 2467475f6387SJan Schmidt 2468475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2469475f6387SJan Schmidt if (IS_ERR(di_args)) 2470475f6387SJan Schmidt return PTR_ERR(di_args); 2471475f6387SJan Schmidt 2472dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2473475f6387SJan Schmidt s_uuid = di_args->uuid; 2474475f6387SJan Schmidt 2475475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2476aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2477475f6387SJan Schmidt 2478475f6387SJan Schmidt if (!dev) { 2479475f6387SJan Schmidt ret = -ENODEV; 2480475f6387SJan Schmidt goto out; 2481475f6387SJan Schmidt } 2482475f6387SJan Schmidt 2483475f6387SJan Schmidt di_args->devid = dev->devid; 2484475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2485475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2486475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2487a27202fbSJim Meyering if (dev->name) { 2488606686eeSJosef Bacik struct rcu_string *name; 2489606686eeSJosef Bacik 2490606686eeSJosef Bacik rcu_read_lock(); 2491606686eeSJosef Bacik name = rcu_dereference(dev->name); 2492606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2493606686eeSJosef Bacik rcu_read_unlock(); 2494a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2495a27202fbSJim Meyering } else { 249699ba55adSStefan Behrens di_args->path[0] = '\0'; 2497a27202fbSJim Meyering } 2498475f6387SJan Schmidt 2499475f6387SJan Schmidt out: 250055793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2501475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2502475f6387SJan Schmidt ret = -EFAULT; 2503475f6387SJan Schmidt 2504475f6387SJan Schmidt kfree(di_args); 2505475f6387SJan Schmidt return ret; 2506475f6387SJan Schmidt } 2507475f6387SJan Schmidt 2508416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2509416161dbSMark Fasheh { 2510416161dbSMark Fasheh struct page *page; 2511416161dbSMark Fasheh pgoff_t index; 2512416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2513416161dbSMark Fasheh 2514416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2515416161dbSMark Fasheh 2516416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2517416161dbSMark Fasheh if (!page) 2518416161dbSMark Fasheh return NULL; 2519416161dbSMark Fasheh 2520416161dbSMark Fasheh if (!PageUptodate(page)) { 2521416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2522416161dbSMark Fasheh 0)) 2523416161dbSMark Fasheh return NULL; 2524416161dbSMark Fasheh lock_page(page); 2525416161dbSMark Fasheh if (!PageUptodate(page)) { 2526416161dbSMark Fasheh unlock_page(page); 2527416161dbSMark Fasheh page_cache_release(page); 2528416161dbSMark Fasheh return NULL; 2529416161dbSMark Fasheh } 2530416161dbSMark Fasheh } 2531416161dbSMark Fasheh unlock_page(page); 2532416161dbSMark Fasheh 2533416161dbSMark Fasheh return page; 2534416161dbSMark Fasheh } 2535416161dbSMark Fasheh 253677fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 253777fe20dcSMark Fasheh { 253877fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 253977fe20dcSMark Fasheh another, and lock file content */ 254077fe20dcSMark Fasheh while (1) { 254177fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 254277fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 254377fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 254477fe20dcSMark Fasheh off + len - 1); 254577fe20dcSMark Fasheh if (!ordered && 254677fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 254777fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 254877fe20dcSMark Fasheh break; 254977fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 255077fe20dcSMark Fasheh if (ordered) 255177fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 255277fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 255377fe20dcSMark Fasheh } 255477fe20dcSMark Fasheh } 255577fe20dcSMark Fasheh 2556416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2557416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2558416161dbSMark Fasheh { 2559416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2560416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2561416161dbSMark Fasheh 2562416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2563416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2564416161dbSMark Fasheh } 2565416161dbSMark Fasheh 2566416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2567416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2568416161dbSMark Fasheh { 2569416161dbSMark Fasheh if (inode1 < inode2) { 2570416161dbSMark Fasheh swap(inode1, inode2); 2571416161dbSMark Fasheh swap(loff1, loff2); 2572416161dbSMark Fasheh } 2573416161dbSMark Fasheh 2574416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2575416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2576416161dbSMark Fasheh if (inode1 != inode2) { 2577416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2578416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2579416161dbSMark Fasheh } 2580416161dbSMark Fasheh } 2581416161dbSMark Fasheh 2582416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2583416161dbSMark Fasheh u64 dst_loff, u64 len) 2584416161dbSMark Fasheh { 2585416161dbSMark Fasheh int ret = 0; 2586416161dbSMark Fasheh struct page *src_page, *dst_page; 2587416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2588416161dbSMark Fasheh void *addr, *dst_addr; 2589416161dbSMark Fasheh 2590416161dbSMark Fasheh while (len) { 2591416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2592416161dbSMark Fasheh cmp_len = len; 2593416161dbSMark Fasheh 2594416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2595416161dbSMark Fasheh if (!src_page) 2596416161dbSMark Fasheh return -EINVAL; 2597416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2598416161dbSMark Fasheh if (!dst_page) { 2599416161dbSMark Fasheh page_cache_release(src_page); 2600416161dbSMark Fasheh return -EINVAL; 2601416161dbSMark Fasheh } 2602416161dbSMark Fasheh addr = kmap_atomic(src_page); 2603416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2604416161dbSMark Fasheh 2605416161dbSMark Fasheh flush_dcache_page(src_page); 2606416161dbSMark Fasheh flush_dcache_page(dst_page); 2607416161dbSMark Fasheh 2608416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2609416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2610416161dbSMark Fasheh 2611416161dbSMark Fasheh kunmap_atomic(addr); 2612416161dbSMark Fasheh kunmap_atomic(dst_addr); 2613416161dbSMark Fasheh page_cache_release(src_page); 2614416161dbSMark Fasheh page_cache_release(dst_page); 2615416161dbSMark Fasheh 2616416161dbSMark Fasheh if (ret) 2617416161dbSMark Fasheh break; 2618416161dbSMark Fasheh 2619416161dbSMark Fasheh loff += cmp_len; 2620416161dbSMark Fasheh dst_loff += cmp_len; 2621416161dbSMark Fasheh len -= cmp_len; 2622416161dbSMark Fasheh } 2623416161dbSMark Fasheh 2624416161dbSMark Fasheh return ret; 2625416161dbSMark Fasheh } 2626416161dbSMark Fasheh 2627416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2628416161dbSMark Fasheh { 2629416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2630416161dbSMark Fasheh 2631416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2632416161dbSMark Fasheh return -EINVAL; 2633416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2634416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2635416161dbSMark Fasheh return -EINVAL; 2636416161dbSMark Fasheh 2637416161dbSMark Fasheh return 0; 2638416161dbSMark Fasheh } 2639416161dbSMark Fasheh 2640416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2641416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2642416161dbSMark Fasheh { 2643416161dbSMark Fasheh int ret; 2644416161dbSMark Fasheh 2645416161dbSMark Fasheh /* 2646416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2647416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2648416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2649416161dbSMark Fasheh */ 2650416161dbSMark Fasheh if (src == dst) 2651416161dbSMark Fasheh return -EINVAL; 2652416161dbSMark Fasheh 2653416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2654416161dbSMark Fasheh 2655416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2656416161dbSMark Fasheh if (ret) 2657416161dbSMark Fasheh goto out_unlock; 2658416161dbSMark Fasheh 2659416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2660416161dbSMark Fasheh if (ret) 2661416161dbSMark Fasheh goto out_unlock; 2662416161dbSMark Fasheh 2663416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2664416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2665416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2666416161dbSMark Fasheh ret = -EINVAL; 2667416161dbSMark Fasheh goto out_unlock; 2668416161dbSMark Fasheh } 2669416161dbSMark Fasheh 2670416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2671416161dbSMark Fasheh if (ret == 0) 2672416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2673416161dbSMark Fasheh 2674416161dbSMark Fasheh out_unlock: 2675416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2676416161dbSMark Fasheh 2677416161dbSMark Fasheh return ret; 2678416161dbSMark Fasheh } 2679416161dbSMark Fasheh 2680416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2681416161dbSMark Fasheh 2682416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2683416161dbSMark Fasheh void __user *argp) 2684416161dbSMark Fasheh { 2685cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2686cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2687cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2688416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2689416161dbSMark Fasheh struct file *dst_file = NULL; 2690416161dbSMark Fasheh struct inode *dst; 2691416161dbSMark Fasheh u64 off; 2692416161dbSMark Fasheh u64 len; 2693416161dbSMark Fasheh int i; 2694416161dbSMark Fasheh int ret; 2695cbf8b8caSMark Fasheh unsigned long size; 2696416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2697416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2698416161dbSMark Fasheh 2699416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2700416161dbSMark Fasheh return -EINVAL; 2701416161dbSMark Fasheh 2702416161dbSMark Fasheh ret = mnt_want_write_file(file); 2703416161dbSMark Fasheh if (ret) 2704416161dbSMark Fasheh return ret; 2705416161dbSMark Fasheh 2706cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2707416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2708cbf8b8caSMark Fasheh sizeof(tmp))) { 2709416161dbSMark Fasheh ret = -EFAULT; 2710416161dbSMark Fasheh goto out; 2711416161dbSMark Fasheh } 2712416161dbSMark Fasheh 2713cbf8b8caSMark Fasheh size = sizeof(tmp) + 2714cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2715cbf8b8caSMark Fasheh 2716229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2717cbf8b8caSMark Fasheh 2718229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2719229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2720cbf8b8caSMark Fasheh goto out; 2721cbf8b8caSMark Fasheh } 2722cbf8b8caSMark Fasheh 2723cbf8b8caSMark Fasheh off = same->logical_offset; 2724cbf8b8caSMark Fasheh len = same->length; 2725416161dbSMark Fasheh 2726416161dbSMark Fasheh /* 2727416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2728416161dbSMark Fasheh * This is intended to bound the total time spent in this 2729416161dbSMark Fasheh * ioctl to something sane. 2730416161dbSMark Fasheh */ 2731416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2732416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2733416161dbSMark Fasheh 2734416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2735416161dbSMark Fasheh /* 2736416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2737416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2738416161dbSMark Fasheh * this situation without an update. 2739416161dbSMark Fasheh */ 2740416161dbSMark Fasheh ret = -EINVAL; 2741416161dbSMark Fasheh goto out; 2742416161dbSMark Fasheh } 2743416161dbSMark Fasheh 2744416161dbSMark Fasheh ret = -EISDIR; 2745416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2746416161dbSMark Fasheh goto out; 2747416161dbSMark Fasheh 2748416161dbSMark Fasheh ret = -EACCES; 2749416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2750416161dbSMark Fasheh goto out; 2751416161dbSMark Fasheh 2752cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2753cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2754cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2755cbf8b8caSMark Fasheh same->info[i].status = 0; 2756416161dbSMark Fasheh } 2757416161dbSMark Fasheh 2758cbf8b8caSMark Fasheh ret = 0; 2759cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2760cbf8b8caSMark Fasheh info = &same->info[i]; 2761416161dbSMark Fasheh 2762cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2763416161dbSMark Fasheh if (!dst_file) { 2764cbf8b8caSMark Fasheh info->status = -EBADF; 2765416161dbSMark Fasheh goto next; 2766416161dbSMark Fasheh } 2767416161dbSMark Fasheh 2768416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2769cbf8b8caSMark Fasheh info->status = -EINVAL; 2770416161dbSMark Fasheh goto next; 2771416161dbSMark Fasheh } 2772416161dbSMark Fasheh 2773cbf8b8caSMark Fasheh info->status = -EXDEV; 2774416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2775416161dbSMark Fasheh goto next; 2776416161dbSMark Fasheh 2777416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2778416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2779416161dbSMark Fasheh goto next; 2780416161dbSMark Fasheh 2781416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2782cbf8b8caSMark Fasheh info->status = -EISDIR; 2783416161dbSMark Fasheh goto next; 2784416161dbSMark Fasheh } 2785416161dbSMark Fasheh 2786416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2787cbf8b8caSMark Fasheh info->status = -EACCES; 2788416161dbSMark Fasheh goto next; 2789416161dbSMark Fasheh } 2790416161dbSMark Fasheh 2791cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2792cbf8b8caSMark Fasheh info->logical_offset); 2793cbf8b8caSMark Fasheh if (info->status == 0) 2794cbf8b8caSMark Fasheh info->bytes_deduped += len; 2795416161dbSMark Fasheh 2796416161dbSMark Fasheh next: 2797416161dbSMark Fasheh if (dst_file) 2798416161dbSMark Fasheh fput(dst_file); 2799cbf8b8caSMark Fasheh } 2800416161dbSMark Fasheh 2801cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2802cbf8b8caSMark Fasheh if (ret) 2803416161dbSMark Fasheh ret = -EFAULT; 2804416161dbSMark Fasheh 2805416161dbSMark Fasheh out: 2806416161dbSMark Fasheh mnt_drop_write_file(file); 2807416161dbSMark Fasheh return ret; 2808416161dbSMark Fasheh } 2809416161dbSMark Fasheh 281032b7c687SMark Fasheh /** 281132b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 281232b7c687SMark Fasheh * 281332b7c687SMark Fasheh * @src: Inode to clone from 281432b7c687SMark Fasheh * @inode: Inode to clone to 281532b7c687SMark Fasheh * @off: Offset within source to start clone from 281632b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 281732b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 281832b7c687SMark Fasheh * identical values here 281932b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 282032b7c687SMark Fasheh */ 282132b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 282232b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2823f46b5a66SChristoph Hellwig { 2824f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 282532b7c687SMark Fasheh struct btrfs_path *path = NULL; 2826f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 282732b7c687SMark Fasheh struct btrfs_trans_handle *trans; 282832b7c687SMark Fasheh char *buf = NULL; 2829ae01a0abSYan Zheng struct btrfs_key key; 2830f46b5a66SChristoph Hellwig u32 nritems; 2831f46b5a66SChristoph Hellwig int slot; 2832ae01a0abSYan Zheng int ret; 283332b7c687SMark Fasheh u64 len = olen_aligned; 2834ae01a0abSYan Zheng 2835ae01a0abSYan Zheng ret = -ENOMEM; 2836ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2837ae01a0abSYan Zheng if (!buf) 283832b7c687SMark Fasheh return ret; 2839ae01a0abSYan Zheng 2840ae01a0abSYan Zheng path = btrfs_alloc_path(); 2841ae01a0abSYan Zheng if (!path) { 2842ae01a0abSYan Zheng vfree(buf); 284332b7c687SMark Fasheh return ret; 2844ae01a0abSYan Zheng } 284532b7c687SMark Fasheh 2846ae01a0abSYan Zheng path->reada = 2; 2847c5c9cd4dSSage Weil /* clone data */ 284833345d01SLi Zefan key.objectid = btrfs_ino(src); 2849ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2850ae01a0abSYan Zheng key.offset = 0; 2851f46b5a66SChristoph Hellwig 2852f46b5a66SChristoph Hellwig while (1) { 2853f46b5a66SChristoph Hellwig /* 2854f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2855f46b5a66SChristoph Hellwig * tree. 2856f46b5a66SChristoph Hellwig */ 2857362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2858362a20c5SDavid Sterba 0, 0); 2859f46b5a66SChristoph Hellwig if (ret < 0) 2860f46b5a66SChristoph Hellwig goto out; 2861f46b5a66SChristoph Hellwig 2862ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2863ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2864362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2865f46b5a66SChristoph Hellwig if (ret < 0) 2866f46b5a66SChristoph Hellwig goto out; 2867f46b5a66SChristoph Hellwig if (ret > 0) 2868f46b5a66SChristoph Hellwig break; 2869ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2870f46b5a66SChristoph Hellwig } 2871f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2872f46b5a66SChristoph Hellwig slot = path->slots[0]; 2873f46b5a66SChristoph Hellwig 2874ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2875d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 287633345d01SLi Zefan key.objectid != btrfs_ino(src)) 2877f46b5a66SChristoph Hellwig break; 2878f46b5a66SChristoph Hellwig 2879c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2880c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2881c5c9cd4dSSage Weil int type; 288231840ae1SZheng Yan u32 size; 288331840ae1SZheng Yan struct btrfs_key new_key; 2884c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2885c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2886c5c9cd4dSSage Weil u8 comp; 2887b5384d48SSage Weil u64 endoff; 288831840ae1SZheng Yan 288931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 289031840ae1SZheng Yan read_extent_buffer(leaf, buf, 289131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 289231840ae1SZheng Yan size); 2893c5c9cd4dSSage Weil 2894c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2895c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2896c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2897c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2898c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2899c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2900d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2901d397712bSChris Mason extent); 2902d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2903d397712bSChris Mason extent); 2904c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2905d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2906d397712bSChris Mason extent); 2907c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2908c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2909c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2910c5c9cd4dSSage Weil extent); 2911c5c9cd4dSSage Weil } 2912b3b4aa74SDavid Sterba btrfs_release_path(path); 291331840ae1SZheng Yan 2914050006a7SSage Weil if (key.offset + datal <= off || 2915aa42ffd9SLiu Bo key.offset >= off + len - 1) 2916c5c9cd4dSSage Weil goto next; 2917c5c9cd4dSSage Weil 291831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 291933345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 29204d728ec7SLi Zefan if (off <= key.offset) 2921c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 29224d728ec7SLi Zefan else 29234d728ec7SLi Zefan new_key.offset = destoff; 2924c5c9cd4dSSage Weil 2925b6f3409bSSage Weil /* 2926b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2927b6f3409bSSage Weil * 1 - add new extent 2928b6f3409bSSage Weil * 1 - inode update 2929b6f3409bSSage Weil */ 2930b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2931a22285a6SYan, Zheng if (IS_ERR(trans)) { 2932a22285a6SYan, Zheng ret = PTR_ERR(trans); 2933a22285a6SYan, Zheng goto out; 2934a22285a6SYan, Zheng } 2935a22285a6SYan, Zheng 2936c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2937c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2938d72c0842SLi Zefan /* 2939d72c0842SLi Zefan * a | --- range to clone ---| b 2940d72c0842SLi Zefan * | ------------- extent ------------- | 2941d72c0842SLi Zefan */ 2942d72c0842SLi Zefan 2943d72c0842SLi Zefan /* substract range b */ 2944d72c0842SLi Zefan if (key.offset + datal > off + len) 2945d72c0842SLi Zefan datal = off + len - key.offset; 2946d72c0842SLi Zefan 2947d72c0842SLi Zefan /* substract range a */ 2948a22285a6SYan, Zheng if (off > key.offset) { 2949a22285a6SYan, Zheng datao += off - key.offset; 2950a22285a6SYan, Zheng datal -= off - key.offset; 2951a22285a6SYan, Zheng } 2952a22285a6SYan, Zheng 29535dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2954a22285a6SYan, Zheng new_key.offset, 2955a22285a6SYan, Zheng new_key.offset + datal, 29562671485dSJosef Bacik 1); 295779787eaaSJeff Mahoney if (ret) { 295879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 295979787eaaSJeff Mahoney ret); 296079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 296179787eaaSJeff Mahoney goto out; 296279787eaaSJeff Mahoney } 2963a22285a6SYan, Zheng 296431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 296531840ae1SZheng Yan &new_key, size); 296679787eaaSJeff Mahoney if (ret) { 296779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 296879787eaaSJeff Mahoney ret); 296979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 297079787eaaSJeff Mahoney goto out; 297179787eaaSJeff Mahoney } 297231840ae1SZheng Yan 297331840ae1SZheng Yan leaf = path->nodes[0]; 297431840ae1SZheng Yan slot = path->slots[0]; 297531840ae1SZheng Yan write_extent_buffer(leaf, buf, 297631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 297731840ae1SZheng Yan size); 2978ae01a0abSYan Zheng 2979f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2980f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2981c5c9cd4dSSage Weil 2982c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2983c5c9cd4dSSage Weil if (!disko) 2984c5c9cd4dSSage Weil datao = 0; 2985c5c9cd4dSSage Weil 2986c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2987c5c9cd4dSSage Weil datao); 2988c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2989c5c9cd4dSSage Weil datal); 2990c5c9cd4dSSage Weil if (disko) { 2991c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2992ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 29935d4f98a2SYan Zheng disko, diskl, 0, 2994f46b5a66SChristoph Hellwig root->root_key.objectid, 299533345d01SLi Zefan btrfs_ino(inode), 299666d7e7f0SArne Jansen new_key.offset - datao, 299766d7e7f0SArne Jansen 0); 299879787eaaSJeff Mahoney if (ret) { 299979787eaaSJeff Mahoney btrfs_abort_transaction(trans, 300079787eaaSJeff Mahoney root, 300179787eaaSJeff Mahoney ret); 300279787eaaSJeff Mahoney btrfs_end_transaction(trans, 300379787eaaSJeff Mahoney root); 300479787eaaSJeff Mahoney goto out; 300579787eaaSJeff Mahoney 300679787eaaSJeff Mahoney } 3007f46b5a66SChristoph Hellwig } 3008c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3009c5c9cd4dSSage Weil u64 skip = 0; 3010c5c9cd4dSSage Weil u64 trim = 0; 3011c5c9cd4dSSage Weil if (off > key.offset) { 3012c5c9cd4dSSage Weil skip = off - key.offset; 3013c5c9cd4dSSage Weil new_key.offset += skip; 301431840ae1SZheng Yan } 3015d397712bSChris Mason 3016c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3017c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3018d397712bSChris Mason 3019c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3020c5c9cd4dSSage Weil ret = -EINVAL; 3021a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3022c5c9cd4dSSage Weil goto out; 302331840ae1SZheng Yan } 3024c5c9cd4dSSage Weil size -= skip + trim; 3025c5c9cd4dSSage Weil datal -= skip + trim; 3026a22285a6SYan, Zheng 30275dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3028a22285a6SYan, Zheng new_key.offset, 3029a22285a6SYan, Zheng new_key.offset + datal, 30302671485dSJosef Bacik 1); 303179787eaaSJeff Mahoney if (ret) { 303279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 303379787eaaSJeff Mahoney ret); 303479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 303579787eaaSJeff Mahoney goto out; 303679787eaaSJeff Mahoney } 3037a22285a6SYan, Zheng 3038c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3039c5c9cd4dSSage Weil &new_key, size); 304079787eaaSJeff Mahoney if (ret) { 304179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304279787eaaSJeff Mahoney ret); 304379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304479787eaaSJeff Mahoney goto out; 304579787eaaSJeff Mahoney } 3046c5c9cd4dSSage Weil 3047c5c9cd4dSSage Weil if (skip) { 3048d397712bSChris Mason u32 start = 3049d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3050c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3051c5c9cd4dSSage Weil datal); 3052c5c9cd4dSSage Weil } 3053c5c9cd4dSSage Weil 3054c5c9cd4dSSage Weil leaf = path->nodes[0]; 3055c5c9cd4dSSage Weil slot = path->slots[0]; 3056c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3057c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3058c5c9cd4dSSage Weil size); 3059c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3060c5c9cd4dSSage Weil } 3061c5c9cd4dSSage Weil 3062c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3063b3b4aa74SDavid Sterba btrfs_release_path(path); 3064c5c9cd4dSSage Weil 30650c4d2d95SJosef Bacik inode_inc_iversion(inode); 3066a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3067b5384d48SSage Weil 3068b5384d48SSage Weil /* 3069b5384d48SSage Weil * we round up to the block size at eof when 3070b5384d48SSage Weil * determining which extents to clone above, 3071b5384d48SSage Weil * but shouldn't round up the file size 3072b5384d48SSage Weil */ 3073b5384d48SSage Weil endoff = new_key.offset + datal; 30745f3888ffSLi Zefan if (endoff > destoff+olen) 30755f3888ffSLi Zefan endoff = destoff+olen; 3076b5384d48SSage Weil if (endoff > inode->i_size) 3077b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3078b5384d48SSage Weil 3079a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 308079787eaaSJeff Mahoney if (ret) { 308179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3082a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 308379787eaaSJeff Mahoney goto out; 308479787eaaSJeff Mahoney } 308579787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3086a22285a6SYan, Zheng } 3087c5c9cd4dSSage Weil next: 3088b3b4aa74SDavid Sterba btrfs_release_path(path); 3089ae01a0abSYan Zheng key.offset++; 3090ae01a0abSYan Zheng } 3091f46b5a66SChristoph Hellwig ret = 0; 309232b7c687SMark Fasheh 3093f46b5a66SChristoph Hellwig out: 3094b3b4aa74SDavid Sterba btrfs_release_path(path); 309532b7c687SMark Fasheh btrfs_free_path(path); 309632b7c687SMark Fasheh vfree(buf); 309732b7c687SMark Fasheh return ret; 309832b7c687SMark Fasheh } 309932b7c687SMark Fasheh 310032b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 310132b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 310232b7c687SMark Fasheh { 310332b7c687SMark Fasheh struct inode *inode = fdentry(file)->d_inode; 310432b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 310532b7c687SMark Fasheh struct fd src_file; 310632b7c687SMark Fasheh struct inode *src; 310732b7c687SMark Fasheh int ret; 310832b7c687SMark Fasheh u64 len = olen; 310932b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 311032b7c687SMark Fasheh int same_inode = 0; 311132b7c687SMark Fasheh 311232b7c687SMark Fasheh /* 311332b7c687SMark Fasheh * TODO: 311432b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 311532b7c687SMark Fasheh * decompress into destination's address_space (the file offset 311632b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 311732b7c687SMark Fasheh * otherwise reinsert) a subrange. 311832b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 311932b7c687SMark Fasheh * they don't overlap)? 312032b7c687SMark Fasheh */ 312132b7c687SMark Fasheh 312232b7c687SMark Fasheh /* the destination must be opened for writing */ 312332b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 312432b7c687SMark Fasheh return -EINVAL; 312532b7c687SMark Fasheh 312632b7c687SMark Fasheh if (btrfs_root_readonly(root)) 312732b7c687SMark Fasheh return -EROFS; 312832b7c687SMark Fasheh 312932b7c687SMark Fasheh ret = mnt_want_write_file(file); 313032b7c687SMark Fasheh if (ret) 313132b7c687SMark Fasheh return ret; 313232b7c687SMark Fasheh 313332b7c687SMark Fasheh src_file = fdget(srcfd); 313432b7c687SMark Fasheh if (!src_file.file) { 313532b7c687SMark Fasheh ret = -EBADF; 313632b7c687SMark Fasheh goto out_drop_write; 313732b7c687SMark Fasheh } 313832b7c687SMark Fasheh 313932b7c687SMark Fasheh ret = -EXDEV; 314032b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 314132b7c687SMark Fasheh goto out_fput; 314232b7c687SMark Fasheh 314332b7c687SMark Fasheh src = file_inode(src_file.file); 314432b7c687SMark Fasheh 314532b7c687SMark Fasheh ret = -EINVAL; 314632b7c687SMark Fasheh if (src == inode) 314732b7c687SMark Fasheh same_inode = 1; 314832b7c687SMark Fasheh 314932b7c687SMark Fasheh /* the src must be open for reading */ 315032b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 315132b7c687SMark Fasheh goto out_fput; 315232b7c687SMark Fasheh 315332b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 315432b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 315532b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 315632b7c687SMark Fasheh goto out_fput; 315732b7c687SMark Fasheh 315832b7c687SMark Fasheh ret = -EISDIR; 315932b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 316032b7c687SMark Fasheh goto out_fput; 316132b7c687SMark Fasheh 316232b7c687SMark Fasheh ret = -EXDEV; 316332b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 316432b7c687SMark Fasheh goto out_fput; 316532b7c687SMark Fasheh 316632b7c687SMark Fasheh if (!same_inode) { 316732b7c687SMark Fasheh if (inode < src) { 316832b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 316932b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 317032b7c687SMark Fasheh } else { 317132b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 317232b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 317332b7c687SMark Fasheh } 317432b7c687SMark Fasheh } else { 317532b7c687SMark Fasheh mutex_lock(&src->i_mutex); 317632b7c687SMark Fasheh } 317732b7c687SMark Fasheh 317832b7c687SMark Fasheh /* determine range to clone */ 317932b7c687SMark Fasheh ret = -EINVAL; 318032b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 318132b7c687SMark Fasheh goto out_unlock; 318232b7c687SMark Fasheh if (len == 0) 318332b7c687SMark Fasheh olen = len = src->i_size - off; 318432b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 318532b7c687SMark Fasheh if (off + len == src->i_size) 318632b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 318732b7c687SMark Fasheh 318832b7c687SMark Fasheh /* verify the end result is block aligned */ 318932b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 319032b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 319132b7c687SMark Fasheh goto out_unlock; 319232b7c687SMark Fasheh 319332b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 319432b7c687SMark Fasheh if (same_inode) { 319532b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 319632b7c687SMark Fasheh goto out_unlock; 319732b7c687SMark Fasheh } 319832b7c687SMark Fasheh 319932b7c687SMark Fasheh if (destoff > inode->i_size) { 320032b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 320132b7c687SMark Fasheh if (ret) 320232b7c687SMark Fasheh goto out_unlock; 320332b7c687SMark Fasheh } 320432b7c687SMark Fasheh 320532b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 320632b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 320732b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 320832b7c687SMark Fasheh 320932b7c687SMark Fasheh lock_extent_range(src, off, len); 321032b7c687SMark Fasheh 321132b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 321232b7c687SMark Fasheh 3213aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3214f46b5a66SChristoph Hellwig out_unlock: 3215f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3216a96fbc72SLiu Bo if (!same_inode) 3217f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3218f46b5a66SChristoph Hellwig out_fput: 32192903ff01SAl Viro fdput(src_file); 3220ab67b7c1SYan Zheng out_drop_write: 32212a79f17eSAl Viro mnt_drop_write_file(file); 3222f46b5a66SChristoph Hellwig return ret; 3223f46b5a66SChristoph Hellwig } 3224f46b5a66SChristoph Hellwig 32257a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3226c5c9cd4dSSage Weil { 3227c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3228c5c9cd4dSSage Weil 32297a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3230c5c9cd4dSSage Weil return -EFAULT; 3231c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3232c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3233c5c9cd4dSSage Weil } 3234c5c9cd4dSSage Weil 3235f46b5a66SChristoph Hellwig /* 3236f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3237f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3238f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3239f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3240f46b5a66SChristoph Hellwig */ 3241b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3242f46b5a66SChristoph Hellwig { 3243496ad9aaSAl Viro struct inode *inode = file_inode(file); 3244f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3245f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 32461ab86aedSSage Weil int ret; 3247f46b5a66SChristoph Hellwig 32481ab86aedSSage Weil ret = -EPERM; 3249df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3250f46b5a66SChristoph Hellwig goto out; 32511ab86aedSSage Weil 32521ab86aedSSage Weil ret = -EINPROGRESS; 32531ab86aedSSage Weil if (file->private_data) 32541ab86aedSSage Weil goto out; 32559ca9ee09SSage Weil 3256b83cc969SLi Zefan ret = -EROFS; 3257b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3258b83cc969SLi Zefan goto out; 3259b83cc969SLi Zefan 3260a561be71SAl Viro ret = mnt_want_write_file(file); 3261c146afadSYan Zheng if (ret) 3262c146afadSYan Zheng goto out; 3263c146afadSYan Zheng 3264a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 32659ca9ee09SSage Weil 3266f46b5a66SChristoph Hellwig ret = -ENOMEM; 32677a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3268abd30bb0STsutomu Itoh if (IS_ERR(trans)) 32691ab86aedSSage Weil goto out_drop; 32701ab86aedSSage Weil 32711ab86aedSSage Weil file->private_data = trans; 32721ab86aedSSage Weil return 0; 32731ab86aedSSage Weil 32741ab86aedSSage Weil out_drop: 3275a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 32762a79f17eSAl Viro mnt_drop_write_file(file); 3277f46b5a66SChristoph Hellwig out: 3278f46b5a66SChristoph Hellwig return ret; 3279f46b5a66SChristoph Hellwig } 3280f46b5a66SChristoph Hellwig 32816ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32826ef5ed0dSJosef Bacik { 3283496ad9aaSAl Viro struct inode *inode = file_inode(file); 32846ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32856ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32866ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32876ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32886ef5ed0dSJosef Bacik struct btrfs_path *path; 32896ef5ed0dSJosef Bacik struct btrfs_key location; 32906ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 32916ef5ed0dSJosef Bacik u64 objectid = 0; 32926ef5ed0dSJosef Bacik u64 dir_id; 32933c04ce01SMiao Xie int ret; 32946ef5ed0dSJosef Bacik 32956ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 32966ef5ed0dSJosef Bacik return -EPERM; 32976ef5ed0dSJosef Bacik 32983c04ce01SMiao Xie ret = mnt_want_write_file(file); 32993c04ce01SMiao Xie if (ret) 33003c04ce01SMiao Xie return ret; 33013c04ce01SMiao Xie 33023c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33033c04ce01SMiao Xie ret = -EFAULT; 33043c04ce01SMiao Xie goto out; 33053c04ce01SMiao Xie } 33066ef5ed0dSJosef Bacik 33076ef5ed0dSJosef Bacik if (!objectid) 33081cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33096ef5ed0dSJosef Bacik 33106ef5ed0dSJosef Bacik location.objectid = objectid; 33116ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33126ef5ed0dSJosef Bacik location.offset = (u64)-1; 33136ef5ed0dSJosef Bacik 33146ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 33153c04ce01SMiao Xie if (IS_ERR(new_root)) { 33163c04ce01SMiao Xie ret = PTR_ERR(new_root); 33173c04ce01SMiao Xie goto out; 33183c04ce01SMiao Xie } 33196ef5ed0dSJosef Bacik 33206ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33213c04ce01SMiao Xie if (!path) { 33223c04ce01SMiao Xie ret = -ENOMEM; 33233c04ce01SMiao Xie goto out; 33243c04ce01SMiao Xie } 33256ef5ed0dSJosef Bacik path->leave_spinning = 1; 33266ef5ed0dSJosef Bacik 33276ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 332898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33296ef5ed0dSJosef Bacik btrfs_free_path(path); 33303c04ce01SMiao Xie ret = PTR_ERR(trans); 33313c04ce01SMiao Xie goto out; 33326ef5ed0dSJosef Bacik } 33336ef5ed0dSJosef Bacik 33346c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 33356ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 33366ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3337cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33386ef5ed0dSJosef Bacik btrfs_free_path(path); 33396ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33406ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 33416ef5ed0dSJosef Bacik "this isn't going to work\n"); 33423c04ce01SMiao Xie ret = -ENOENT; 33433c04ce01SMiao Xie goto out; 33446ef5ed0dSJosef Bacik } 33456ef5ed0dSJosef Bacik 33466ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33476ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33486ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33496ef5ed0dSJosef Bacik btrfs_free_path(path); 33506ef5ed0dSJosef Bacik 33512b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 33526ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33533c04ce01SMiao Xie out: 33543c04ce01SMiao Xie mnt_drop_write_file(file); 33553c04ce01SMiao Xie return ret; 33566ef5ed0dSJosef Bacik } 33576ef5ed0dSJosef Bacik 33585af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3359bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3360bf5fc093SJosef Bacik { 3361bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3362bf5fc093SJosef Bacik 3363bf5fc093SJosef Bacik space->total_bytes = 0; 3364bf5fc093SJosef Bacik space->used_bytes = 0; 3365bf5fc093SJosef Bacik space->flags = 0; 3366bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3367bf5fc093SJosef Bacik space->flags = block_group->flags; 3368bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3369bf5fc093SJosef Bacik space->used_bytes += 3370bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3371bf5fc093SJosef Bacik } 3372bf5fc093SJosef Bacik } 3373bf5fc093SJosef Bacik 337448a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 33751406e432SJosef Bacik { 33761406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33771406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33781406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33797fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 338013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33811406e432SJosef Bacik struct btrfs_space_info *info; 3382bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3383bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3384bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3385bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3386bf5fc093SJosef Bacik int num_types = 4; 33877fde62bfSChris Mason int alloc_size; 33881406e432SJosef Bacik int ret = 0; 338951788b1bSDan Rosenberg u64 slot_count = 0; 3390bf5fc093SJosef Bacik int i, c; 33911406e432SJosef Bacik 33921406e432SJosef Bacik if (copy_from_user(&space_args, 33931406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 33941406e432SJosef Bacik sizeof(space_args))) 33951406e432SJosef Bacik return -EFAULT; 33961406e432SJosef Bacik 3397bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3398bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3399bf5fc093SJosef Bacik 3400bf5fc093SJosef Bacik info = NULL; 34017fde62bfSChris Mason rcu_read_lock(); 3402bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3403bf5fc093SJosef Bacik list) { 3404bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3405bf5fc093SJosef Bacik info = tmp; 3406bf5fc093SJosef Bacik break; 3407bf5fc093SJosef Bacik } 3408bf5fc093SJosef Bacik } 34097fde62bfSChris Mason rcu_read_unlock(); 34101406e432SJosef Bacik 3411bf5fc093SJosef Bacik if (!info) 3412bf5fc093SJosef Bacik continue; 3413bf5fc093SJosef Bacik 3414bf5fc093SJosef Bacik down_read(&info->groups_sem); 3415bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3416bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3417bf5fc093SJosef Bacik slot_count++; 3418bf5fc093SJosef Bacik } 3419bf5fc093SJosef Bacik up_read(&info->groups_sem); 3420bf5fc093SJosef Bacik } 3421bf5fc093SJosef Bacik 34227fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34237fde62bfSChris Mason if (space_args.space_slots == 0) { 34247fde62bfSChris Mason space_args.total_spaces = slot_count; 34257fde62bfSChris Mason goto out; 34267fde62bfSChris Mason } 3427bf5fc093SJosef Bacik 342851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3429bf5fc093SJosef Bacik 34307fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3431bf5fc093SJosef Bacik 34327fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34337fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34347fde62bfSChris Mason */ 34357fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 34367fde62bfSChris Mason return -ENOMEM; 34377fde62bfSChris Mason 34387fde62bfSChris Mason space_args.total_spaces = 0; 34397fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 34407fde62bfSChris Mason if (!dest) 34417fde62bfSChris Mason return -ENOMEM; 34427fde62bfSChris Mason dest_orig = dest; 34437fde62bfSChris Mason 34447fde62bfSChris Mason /* now we have a buffer to copy into */ 3445bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3446bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3447bf5fc093SJosef Bacik 344851788b1bSDan Rosenberg if (!slot_count) 344951788b1bSDan Rosenberg break; 345051788b1bSDan Rosenberg 3451bf5fc093SJosef Bacik info = NULL; 34521406e432SJosef Bacik rcu_read_lock(); 3453bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3454bf5fc093SJosef Bacik list) { 3455bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3456bf5fc093SJosef Bacik info = tmp; 34577fde62bfSChris Mason break; 3458bf5fc093SJosef Bacik } 3459bf5fc093SJosef Bacik } 3460bf5fc093SJosef Bacik rcu_read_unlock(); 34617fde62bfSChris Mason 3462bf5fc093SJosef Bacik if (!info) 3463bf5fc093SJosef Bacik continue; 3464bf5fc093SJosef Bacik down_read(&info->groups_sem); 3465bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3466bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 34675af3e8ccSStefan Behrens btrfs_get_block_group_info( 34685af3e8ccSStefan Behrens &info->block_groups[c], &space); 34697fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34701406e432SJosef Bacik dest++; 34711406e432SJosef Bacik space_args.total_spaces++; 347251788b1bSDan Rosenberg slot_count--; 34731406e432SJosef Bacik } 347451788b1bSDan Rosenberg if (!slot_count) 347551788b1bSDan Rosenberg break; 3476bf5fc093SJosef Bacik } 3477bf5fc093SJosef Bacik up_read(&info->groups_sem); 3478bf5fc093SJosef Bacik } 34791406e432SJosef Bacik 34802eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 34817fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 34827fde62bfSChris Mason 34837fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 34847fde62bfSChris Mason ret = -EFAULT; 34857fde62bfSChris Mason 34867fde62bfSChris Mason kfree(dest_orig); 34877fde62bfSChris Mason out: 34887fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 34891406e432SJosef Bacik ret = -EFAULT; 34901406e432SJosef Bacik 34911406e432SJosef Bacik return ret; 34921406e432SJosef Bacik } 34931406e432SJosef Bacik 3494f46b5a66SChristoph Hellwig /* 3495f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3496f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3497f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3498f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3499f46b5a66SChristoph Hellwig */ 3500f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3501f46b5a66SChristoph Hellwig { 3502496ad9aaSAl Viro struct inode *inode = file_inode(file); 3503f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3504f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3505f46b5a66SChristoph Hellwig 3506f46b5a66SChristoph Hellwig trans = file->private_data; 35071ab86aedSSage Weil if (!trans) 35081ab86aedSSage Weil return -EINVAL; 3509b214107eSChristoph Hellwig file->private_data = NULL; 35109ca9ee09SSage Weil 35111ab86aedSSage Weil btrfs_end_transaction(trans, root); 35121ab86aedSSage Weil 3513a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 35149ca9ee09SSage Weil 35152a79f17eSAl Viro mnt_drop_write_file(file); 35161ab86aedSSage Weil return 0; 3517f46b5a66SChristoph Hellwig } 3518f46b5a66SChristoph Hellwig 35199a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35209a8c28beSMiao Xie void __user *argp) 352146204592SSage Weil { 352246204592SSage Weil struct btrfs_trans_handle *trans; 352346204592SSage Weil u64 transid; 3524db5b493aSTsutomu Itoh int ret; 352546204592SSage Weil 3526d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3527ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3528ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 352998d5dc13STsutomu Itoh return PTR_ERR(trans); 3530ff7c1d33SMiao Xie 3531ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3532ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3533ff7c1d33SMiao Xie goto out; 3534ff7c1d33SMiao Xie } 353546204592SSage Weil transid = trans->transid; 3536db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 35378b2b2d3cSTsutomu Itoh if (ret) { 35388b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3539db5b493aSTsutomu Itoh return ret; 35408b2b2d3cSTsutomu Itoh } 3541ff7c1d33SMiao Xie out: 354246204592SSage Weil if (argp) 354346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 354446204592SSage Weil return -EFAULT; 354546204592SSage Weil return 0; 354646204592SSage Weil } 354746204592SSage Weil 35489a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 35499a8c28beSMiao Xie void __user *argp) 355046204592SSage Weil { 355146204592SSage Weil u64 transid; 355246204592SSage Weil 355346204592SSage Weil if (argp) { 355446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 355546204592SSage Weil return -EFAULT; 355646204592SSage Weil } else { 355746204592SSage Weil transid = 0; /* current trans */ 355846204592SSage Weil } 355946204592SSage Weil return btrfs_wait_for_commit(root, transid); 356046204592SSage Weil } 356146204592SSage Weil 3562b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3563475f6387SJan Schmidt { 3564496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3565475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3566b8e95489SMiao Xie int ret; 3567475f6387SJan Schmidt 3568475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3569475f6387SJan Schmidt return -EPERM; 3570475f6387SJan Schmidt 3571475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3572475f6387SJan Schmidt if (IS_ERR(sa)) 3573475f6387SJan Schmidt return PTR_ERR(sa); 3574475f6387SJan Schmidt 3575b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3576b8e95489SMiao Xie ret = mnt_want_write_file(file); 3577b8e95489SMiao Xie if (ret) 3578b8e95489SMiao Xie goto out; 3579b8e95489SMiao Xie } 3580b8e95489SMiao Xie 3581aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 358263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 358363a212abSStefan Behrens 0); 3584475f6387SJan Schmidt 3585475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3586475f6387SJan Schmidt ret = -EFAULT; 3587475f6387SJan Schmidt 3588b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3589b8e95489SMiao Xie mnt_drop_write_file(file); 3590b8e95489SMiao Xie out: 3591475f6387SJan Schmidt kfree(sa); 3592475f6387SJan Schmidt return ret; 3593475f6387SJan Schmidt } 3594475f6387SJan Schmidt 3595475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3596475f6387SJan Schmidt { 3597475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3598475f6387SJan Schmidt return -EPERM; 3599475f6387SJan Schmidt 3600aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3601475f6387SJan Schmidt } 3602475f6387SJan Schmidt 3603475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3604475f6387SJan Schmidt void __user *arg) 3605475f6387SJan Schmidt { 3606475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3607475f6387SJan Schmidt int ret; 3608475f6387SJan Schmidt 3609475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3610475f6387SJan Schmidt return -EPERM; 3611475f6387SJan Schmidt 3612475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3613475f6387SJan Schmidt if (IS_ERR(sa)) 3614475f6387SJan Schmidt return PTR_ERR(sa); 3615475f6387SJan Schmidt 3616475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3617475f6387SJan Schmidt 3618475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3619475f6387SJan Schmidt ret = -EFAULT; 3620475f6387SJan Schmidt 3621475f6387SJan Schmidt kfree(sa); 3622475f6387SJan Schmidt return ret; 3623475f6387SJan Schmidt } 3624475f6387SJan Schmidt 3625c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3626b27f7c0cSDavid Sterba void __user *arg) 3627c11d2c23SStefan Behrens { 3628c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3629c11d2c23SStefan Behrens int ret; 3630c11d2c23SStefan Behrens 3631c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3632c11d2c23SStefan Behrens if (IS_ERR(sa)) 3633c11d2c23SStefan Behrens return PTR_ERR(sa); 3634c11d2c23SStefan Behrens 3635b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3636b27f7c0cSDavid Sterba kfree(sa); 3637b27f7c0cSDavid Sterba return -EPERM; 3638b27f7c0cSDavid Sterba } 3639b27f7c0cSDavid Sterba 3640b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3641c11d2c23SStefan Behrens 3642c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3643c11d2c23SStefan Behrens ret = -EFAULT; 3644c11d2c23SStefan Behrens 3645c11d2c23SStefan Behrens kfree(sa); 3646c11d2c23SStefan Behrens return ret; 3647c11d2c23SStefan Behrens } 3648c11d2c23SStefan Behrens 36493f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 36503f6bcfbdSStefan Behrens { 36513f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36523f6bcfbdSStefan Behrens int ret; 36533f6bcfbdSStefan Behrens 36543f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36553f6bcfbdSStefan Behrens return -EPERM; 36563f6bcfbdSStefan Behrens 36573f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36583f6bcfbdSStefan Behrens if (IS_ERR(p)) 36593f6bcfbdSStefan Behrens return PTR_ERR(p); 36603f6bcfbdSStefan Behrens 36613f6bcfbdSStefan Behrens switch (p->cmd) { 36623f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3663adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3664adfa97cbSIlya Dryomov ret = -EROFS; 3665adfa97cbSIlya Dryomov goto out; 3666adfa97cbSIlya Dryomov } 36673f6bcfbdSStefan Behrens if (atomic_xchg( 36683f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36693f6bcfbdSStefan Behrens 1)) { 3670e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 36713f6bcfbdSStefan Behrens } else { 36723f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 36733f6bcfbdSStefan Behrens atomic_set( 36743f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36753f6bcfbdSStefan Behrens 0); 36763f6bcfbdSStefan Behrens } 36773f6bcfbdSStefan Behrens break; 36783f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36793f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 36803f6bcfbdSStefan Behrens ret = 0; 36813f6bcfbdSStefan Behrens break; 36823f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 36833f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 36843f6bcfbdSStefan Behrens break; 36853f6bcfbdSStefan Behrens default: 36863f6bcfbdSStefan Behrens ret = -EINVAL; 36873f6bcfbdSStefan Behrens break; 36883f6bcfbdSStefan Behrens } 36893f6bcfbdSStefan Behrens 36903f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 36913f6bcfbdSStefan Behrens ret = -EFAULT; 3692adfa97cbSIlya Dryomov out: 36933f6bcfbdSStefan Behrens kfree(p); 36943f6bcfbdSStefan Behrens return ret; 36953f6bcfbdSStefan Behrens } 36963f6bcfbdSStefan Behrens 3697d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3698d7728c96SJan Schmidt { 3699d7728c96SJan Schmidt int ret = 0; 3700d7728c96SJan Schmidt int i; 3701740c3d22SChris Mason u64 rel_ptr; 3702d7728c96SJan Schmidt int size; 3703806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3704d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3705d7728c96SJan Schmidt struct btrfs_path *path; 3706d7728c96SJan Schmidt 370782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3708d7728c96SJan Schmidt return -EPERM; 3709d7728c96SJan Schmidt 3710d7728c96SJan Schmidt path = btrfs_alloc_path(); 3711d7728c96SJan Schmidt if (!path) { 3712d7728c96SJan Schmidt ret = -ENOMEM; 3713d7728c96SJan Schmidt goto out; 3714d7728c96SJan Schmidt } 3715d7728c96SJan Schmidt 3716d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3717d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3718d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3719d7728c96SJan Schmidt ipa = NULL; 3720d7728c96SJan Schmidt goto out; 3721d7728c96SJan Schmidt } 3722d7728c96SJan Schmidt 3723d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3724d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3725d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3726d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3727d7728c96SJan Schmidt ipath = NULL; 3728d7728c96SJan Schmidt goto out; 3729d7728c96SJan Schmidt } 3730d7728c96SJan Schmidt 3731d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3732d7728c96SJan Schmidt if (ret < 0) 3733d7728c96SJan Schmidt goto out; 3734d7728c96SJan Schmidt 3735d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3736745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3737745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3738740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3739d7728c96SJan Schmidt } 3740d7728c96SJan Schmidt 3741745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3742745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3743d7728c96SJan Schmidt if (ret) { 3744d7728c96SJan Schmidt ret = -EFAULT; 3745d7728c96SJan Schmidt goto out; 3746d7728c96SJan Schmidt } 3747d7728c96SJan Schmidt 3748d7728c96SJan Schmidt out: 3749d7728c96SJan Schmidt btrfs_free_path(path); 3750d7728c96SJan Schmidt free_ipath(ipath); 3751d7728c96SJan Schmidt kfree(ipa); 3752d7728c96SJan Schmidt 3753d7728c96SJan Schmidt return ret; 3754d7728c96SJan Schmidt } 3755d7728c96SJan Schmidt 3756d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3757d7728c96SJan Schmidt { 3758d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3759d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3760d7728c96SJan Schmidt 3761d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3762d7728c96SJan Schmidt inodes->bytes_left -= c; 3763d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3764d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3765d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3766d7728c96SJan Schmidt inodes->elem_cnt += 3; 3767d7728c96SJan Schmidt } else { 3768d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3769d7728c96SJan Schmidt inodes->bytes_left = 0; 3770d7728c96SJan Schmidt inodes->elem_missed += 3; 3771d7728c96SJan Schmidt } 3772d7728c96SJan Schmidt 3773d7728c96SJan Schmidt return 0; 3774d7728c96SJan Schmidt } 3775d7728c96SJan Schmidt 3776d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3777d7728c96SJan Schmidt void __user *arg) 3778d7728c96SJan Schmidt { 3779d7728c96SJan Schmidt int ret = 0; 3780d7728c96SJan Schmidt int size; 3781d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3782d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3783d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3784d7728c96SJan Schmidt 3785d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3786d7728c96SJan Schmidt return -EPERM; 3787d7728c96SJan Schmidt 3788d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3789d7728c96SJan Schmidt if (IS_ERR(loi)) { 3790d7728c96SJan Schmidt ret = PTR_ERR(loi); 3791d7728c96SJan Schmidt loi = NULL; 3792d7728c96SJan Schmidt goto out; 3793d7728c96SJan Schmidt } 3794d7728c96SJan Schmidt 3795d7728c96SJan Schmidt path = btrfs_alloc_path(); 3796d7728c96SJan Schmidt if (!path) { 3797d7728c96SJan Schmidt ret = -ENOMEM; 3798d7728c96SJan Schmidt goto out; 3799d7728c96SJan Schmidt } 3800d7728c96SJan Schmidt 3801425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3802d7728c96SJan Schmidt inodes = init_data_container(size); 3803d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3804d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3805d7728c96SJan Schmidt inodes = NULL; 3806d7728c96SJan Schmidt goto out; 3807d7728c96SJan Schmidt } 3808d7728c96SJan Schmidt 3809df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3810df031f07SLiu Bo build_ino_list, inodes); 3811df031f07SLiu Bo if (ret == -EINVAL) 3812d7728c96SJan Schmidt ret = -ENOENT; 3813d7728c96SJan Schmidt if (ret < 0) 3814d7728c96SJan Schmidt goto out; 3815d7728c96SJan Schmidt 3816745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3817745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3818d7728c96SJan Schmidt if (ret) 3819d7728c96SJan Schmidt ret = -EFAULT; 3820d7728c96SJan Schmidt 3821d7728c96SJan Schmidt out: 3822d7728c96SJan Schmidt btrfs_free_path(path); 3823425d17a2SLiu Bo vfree(inodes); 3824d7728c96SJan Schmidt kfree(loi); 3825d7728c96SJan Schmidt 3826d7728c96SJan Schmidt return ret; 3827d7728c96SJan Schmidt } 3828d7728c96SJan Schmidt 382919a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3830c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3831c9e9f97bSIlya Dryomov { 3832c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3833c9e9f97bSIlya Dryomov 3834c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3835c9e9f97bSIlya Dryomov 3836837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3837837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3838837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3839837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3840a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3841a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3842837d5b6eSIlya Dryomov 3843c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3844c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3845c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 384619a39dceSIlya Dryomov 384719a39dceSIlya Dryomov if (lock) { 384819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 384919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 385119a39dceSIlya Dryomov } else { 385219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385319a39dceSIlya Dryomov } 3854c9e9f97bSIlya Dryomov } 3855c9e9f97bSIlya Dryomov 38569ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3857c9e9f97bSIlya Dryomov { 3858496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3859c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3860c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3861c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3862ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3863c9e9f97bSIlya Dryomov int ret; 3864c9e9f97bSIlya Dryomov 3865c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3866c9e9f97bSIlya Dryomov return -EPERM; 3867c9e9f97bSIlya Dryomov 3868e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38699ba1f6e4SLiu Bo if (ret) 38709ba1f6e4SLiu Bo return ret; 38719ba1f6e4SLiu Bo 3872ed0fb78fSIlya Dryomov again: 3873ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3874c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3875c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3876ed0fb78fSIlya Dryomov need_unlock = true; 3877ed0fb78fSIlya Dryomov goto locked; 3878ed0fb78fSIlya Dryomov } 3879ed0fb78fSIlya Dryomov 3880ed0fb78fSIlya Dryomov /* 3881ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3882ed0fb78fSIlya Dryomov * (1) some other op is running 3883ed0fb78fSIlya Dryomov * (2) balance is running 3884ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3885ed0fb78fSIlya Dryomov */ 3886ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3887ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3888ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3889ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3890ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3891ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3892ed0fb78fSIlya Dryomov goto again; 3893ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3894ed0fb78fSIlya Dryomov 3895ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3896ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3897ed0fb78fSIlya Dryomov /* this is (3) */ 3898ed0fb78fSIlya Dryomov need_unlock = false; 3899ed0fb78fSIlya Dryomov goto locked; 3900ed0fb78fSIlya Dryomov } 3901ed0fb78fSIlya Dryomov 3902ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3903ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3904ed0fb78fSIlya Dryomov goto again; 3905ed0fb78fSIlya Dryomov } else { 3906ed0fb78fSIlya Dryomov /* this is (2) */ 3907ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3908ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3909ed0fb78fSIlya Dryomov goto out; 3910ed0fb78fSIlya Dryomov } 3911ed0fb78fSIlya Dryomov } else { 3912ed0fb78fSIlya Dryomov /* this is (1) */ 3913ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3914e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3915ed0fb78fSIlya Dryomov goto out; 3916ed0fb78fSIlya Dryomov } 3917ed0fb78fSIlya Dryomov 3918ed0fb78fSIlya Dryomov locked: 3919ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3920c9e9f97bSIlya Dryomov 3921c9e9f97bSIlya Dryomov if (arg) { 3922c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3923c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3924c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3925ed0fb78fSIlya Dryomov goto out_unlock; 3926c9e9f97bSIlya Dryomov } 3927de322263SIlya Dryomov 3928de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3929de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3930de322263SIlya Dryomov ret = -ENOTCONN; 3931de322263SIlya Dryomov goto out_bargs; 3932de322263SIlya Dryomov } 3933de322263SIlya Dryomov 3934de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3935de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3936de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3937de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3938de322263SIlya Dryomov 3939de322263SIlya Dryomov goto do_balance; 3940de322263SIlya Dryomov } 3941c9e9f97bSIlya Dryomov } else { 3942c9e9f97bSIlya Dryomov bargs = NULL; 3943c9e9f97bSIlya Dryomov } 3944c9e9f97bSIlya Dryomov 3945ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3946837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3947837d5b6eSIlya Dryomov goto out_bargs; 3948837d5b6eSIlya Dryomov } 3949837d5b6eSIlya Dryomov 3950c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3951c9e9f97bSIlya Dryomov if (!bctl) { 3952c9e9f97bSIlya Dryomov ret = -ENOMEM; 3953c9e9f97bSIlya Dryomov goto out_bargs; 3954c9e9f97bSIlya Dryomov } 3955c9e9f97bSIlya Dryomov 3956c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3957c9e9f97bSIlya Dryomov if (arg) { 3958c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3959c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3960c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3961c9e9f97bSIlya Dryomov 3962c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3963f43ffb60SIlya Dryomov } else { 3964f43ffb60SIlya Dryomov /* balance everything - no filters */ 3965f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3966c9e9f97bSIlya Dryomov } 3967c9e9f97bSIlya Dryomov 3968de322263SIlya Dryomov do_balance: 3969c9e9f97bSIlya Dryomov /* 3970ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3971ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3972ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3973ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3974ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3975c9e9f97bSIlya Dryomov */ 3976ed0fb78fSIlya Dryomov need_unlock = false; 3977ed0fb78fSIlya Dryomov 3978ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3979ed0fb78fSIlya Dryomov 3980c9e9f97bSIlya Dryomov if (arg) { 3981c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3982c9e9f97bSIlya Dryomov ret = -EFAULT; 3983c9e9f97bSIlya Dryomov } 3984c9e9f97bSIlya Dryomov 3985c9e9f97bSIlya Dryomov out_bargs: 3986c9e9f97bSIlya Dryomov kfree(bargs); 3987ed0fb78fSIlya Dryomov out_unlock: 3988c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3989c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3990ed0fb78fSIlya Dryomov if (need_unlock) 3991ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3992ed0fb78fSIlya Dryomov out: 3993e54bfa31SLiu Bo mnt_drop_write_file(file); 3994c9e9f97bSIlya Dryomov return ret; 3995c9e9f97bSIlya Dryomov } 3996c9e9f97bSIlya Dryomov 3997837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3998837d5b6eSIlya Dryomov { 3999837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4000837d5b6eSIlya Dryomov return -EPERM; 4001837d5b6eSIlya Dryomov 4002837d5b6eSIlya Dryomov switch (cmd) { 4003837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4004837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4005a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4006a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4007837d5b6eSIlya Dryomov } 4008837d5b6eSIlya Dryomov 4009837d5b6eSIlya Dryomov return -EINVAL; 4010837d5b6eSIlya Dryomov } 4011837d5b6eSIlya Dryomov 401219a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 401319a39dceSIlya Dryomov void __user *arg) 401419a39dceSIlya Dryomov { 401519a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 401619a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 401719a39dceSIlya Dryomov int ret = 0; 401819a39dceSIlya Dryomov 401919a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 402019a39dceSIlya Dryomov return -EPERM; 402119a39dceSIlya Dryomov 402219a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 402319a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 402419a39dceSIlya Dryomov ret = -ENOTCONN; 402519a39dceSIlya Dryomov goto out; 402619a39dceSIlya Dryomov } 402719a39dceSIlya Dryomov 402819a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 402919a39dceSIlya Dryomov if (!bargs) { 403019a39dceSIlya Dryomov ret = -ENOMEM; 403119a39dceSIlya Dryomov goto out; 403219a39dceSIlya Dryomov } 403319a39dceSIlya Dryomov 403419a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 403519a39dceSIlya Dryomov 403619a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 403719a39dceSIlya Dryomov ret = -EFAULT; 403819a39dceSIlya Dryomov 403919a39dceSIlya Dryomov kfree(bargs); 404019a39dceSIlya Dryomov out: 404119a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 404219a39dceSIlya Dryomov return ret; 404319a39dceSIlya Dryomov } 404419a39dceSIlya Dryomov 4045905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40465d13a37bSArne Jansen { 4047496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40485d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40495d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 40505d13a37bSArne Jansen int ret; 40515d13a37bSArne Jansen int err; 40525d13a37bSArne Jansen 40535d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40545d13a37bSArne Jansen return -EPERM; 40555d13a37bSArne Jansen 4056905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4057905b0ddaSMiao Xie if (ret) 4058905b0ddaSMiao Xie return ret; 40595d13a37bSArne Jansen 40605d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4061905b0ddaSMiao Xie if (IS_ERR(sa)) { 4062905b0ddaSMiao Xie ret = PTR_ERR(sa); 4063905b0ddaSMiao Xie goto drop_write; 4064905b0ddaSMiao Xie } 40655d13a37bSArne Jansen 40667708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 406792f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 40685d13a37bSArne Jansen if (IS_ERR(trans)) { 40695d13a37bSArne Jansen ret = PTR_ERR(trans); 40705d13a37bSArne Jansen goto out; 40715d13a37bSArne Jansen } 40725d13a37bSArne Jansen 40735d13a37bSArne Jansen switch (sa->cmd) { 40745d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 40755d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 40765d13a37bSArne Jansen break; 40775d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 40785d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 40795d13a37bSArne Jansen break; 40805d13a37bSArne Jansen default: 40815d13a37bSArne Jansen ret = -EINVAL; 40825d13a37bSArne Jansen break; 40835d13a37bSArne Jansen } 40845d13a37bSArne Jansen 408592f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 40865d13a37bSArne Jansen if (err && !ret) 40875d13a37bSArne Jansen ret = err; 40885d13a37bSArne Jansen out: 40895d13a37bSArne Jansen kfree(sa); 40907708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4091905b0ddaSMiao Xie drop_write: 4092905b0ddaSMiao Xie mnt_drop_write_file(file); 40935d13a37bSArne Jansen return ret; 40945d13a37bSArne Jansen } 40955d13a37bSArne Jansen 4096905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 40975d13a37bSArne Jansen { 4098496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40995d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41005d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41015d13a37bSArne Jansen int ret; 41025d13a37bSArne Jansen int err; 41035d13a37bSArne Jansen 41045d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41055d13a37bSArne Jansen return -EPERM; 41065d13a37bSArne Jansen 4107905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4108905b0ddaSMiao Xie if (ret) 4109905b0ddaSMiao Xie return ret; 41105d13a37bSArne Jansen 41115d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4112905b0ddaSMiao Xie if (IS_ERR(sa)) { 4113905b0ddaSMiao Xie ret = PTR_ERR(sa); 4114905b0ddaSMiao Xie goto drop_write; 4115905b0ddaSMiao Xie } 41165d13a37bSArne Jansen 41175d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41185d13a37bSArne Jansen if (IS_ERR(trans)) { 41195d13a37bSArne Jansen ret = PTR_ERR(trans); 41205d13a37bSArne Jansen goto out; 41215d13a37bSArne Jansen } 41225d13a37bSArne Jansen 41235d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41245d13a37bSArne Jansen if (sa->assign) { 41255d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 41265d13a37bSArne Jansen sa->src, sa->dst); 41275d13a37bSArne Jansen } else { 41285d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 41295d13a37bSArne Jansen sa->src, sa->dst); 41305d13a37bSArne Jansen } 41315d13a37bSArne Jansen 41325d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41335d13a37bSArne Jansen if (err && !ret) 41345d13a37bSArne Jansen ret = err; 41355d13a37bSArne Jansen 41365d13a37bSArne Jansen out: 41375d13a37bSArne Jansen kfree(sa); 4138905b0ddaSMiao Xie drop_write: 4139905b0ddaSMiao Xie mnt_drop_write_file(file); 41405d13a37bSArne Jansen return ret; 41415d13a37bSArne Jansen } 41425d13a37bSArne Jansen 4143905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41445d13a37bSArne Jansen { 4145496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41465d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41475d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41485d13a37bSArne Jansen int ret; 41495d13a37bSArne Jansen int err; 41505d13a37bSArne Jansen 41515d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41525d13a37bSArne Jansen return -EPERM; 41535d13a37bSArne Jansen 4154905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4155905b0ddaSMiao Xie if (ret) 4156905b0ddaSMiao Xie return ret; 41575d13a37bSArne Jansen 41585d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4159905b0ddaSMiao Xie if (IS_ERR(sa)) { 4160905b0ddaSMiao Xie ret = PTR_ERR(sa); 4161905b0ddaSMiao Xie goto drop_write; 4162905b0ddaSMiao Xie } 41635d13a37bSArne Jansen 4164d86e56cfSMiao Xie if (!sa->qgroupid) { 4165d86e56cfSMiao Xie ret = -EINVAL; 4166d86e56cfSMiao Xie goto out; 4167d86e56cfSMiao Xie } 4168d86e56cfSMiao Xie 41695d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41705d13a37bSArne Jansen if (IS_ERR(trans)) { 41715d13a37bSArne Jansen ret = PTR_ERR(trans); 41725d13a37bSArne Jansen goto out; 41735d13a37bSArne Jansen } 41745d13a37bSArne Jansen 41755d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41765d13a37bSArne Jansen if (sa->create) { 41775d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 41785d13a37bSArne Jansen NULL); 41795d13a37bSArne Jansen } else { 41805d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 41815d13a37bSArne Jansen } 41825d13a37bSArne Jansen 41835d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41845d13a37bSArne Jansen if (err && !ret) 41855d13a37bSArne Jansen ret = err; 41865d13a37bSArne Jansen 41875d13a37bSArne Jansen out: 41885d13a37bSArne Jansen kfree(sa); 4189905b0ddaSMiao Xie drop_write: 4190905b0ddaSMiao Xie mnt_drop_write_file(file); 41915d13a37bSArne Jansen return ret; 41925d13a37bSArne Jansen } 41935d13a37bSArne Jansen 4194905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 41955d13a37bSArne Jansen { 4196496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41975d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 41985d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41995d13a37bSArne Jansen int ret; 42005d13a37bSArne Jansen int err; 42015d13a37bSArne Jansen u64 qgroupid; 42025d13a37bSArne Jansen 42035d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42045d13a37bSArne Jansen return -EPERM; 42055d13a37bSArne Jansen 4206905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4207905b0ddaSMiao Xie if (ret) 4208905b0ddaSMiao Xie return ret; 42095d13a37bSArne Jansen 42105d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4211905b0ddaSMiao Xie if (IS_ERR(sa)) { 4212905b0ddaSMiao Xie ret = PTR_ERR(sa); 4213905b0ddaSMiao Xie goto drop_write; 4214905b0ddaSMiao Xie } 42155d13a37bSArne Jansen 42165d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42175d13a37bSArne Jansen if (IS_ERR(trans)) { 42185d13a37bSArne Jansen ret = PTR_ERR(trans); 42195d13a37bSArne Jansen goto out; 42205d13a37bSArne Jansen } 42215d13a37bSArne Jansen 42225d13a37bSArne Jansen qgroupid = sa->qgroupid; 42235d13a37bSArne Jansen if (!qgroupid) { 42245d13a37bSArne Jansen /* take the current subvol as qgroup */ 42255d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42265d13a37bSArne Jansen } 42275d13a37bSArne Jansen 42285d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42295d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 42305d13a37bSArne Jansen 42315d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42325d13a37bSArne Jansen if (err && !ret) 42335d13a37bSArne Jansen ret = err; 42345d13a37bSArne Jansen 42355d13a37bSArne Jansen out: 42365d13a37bSArne Jansen kfree(sa); 4237905b0ddaSMiao Xie drop_write: 4238905b0ddaSMiao Xie mnt_drop_write_file(file); 42395d13a37bSArne Jansen return ret; 42405d13a37bSArne Jansen } 42415d13a37bSArne Jansen 42422f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42432f232036SJan Schmidt { 42446d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42452f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42462f232036SJan Schmidt int ret; 42472f232036SJan Schmidt 42482f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42492f232036SJan Schmidt return -EPERM; 42502f232036SJan Schmidt 42512f232036SJan Schmidt ret = mnt_want_write_file(file); 42522f232036SJan Schmidt if (ret) 42532f232036SJan Schmidt return ret; 42542f232036SJan Schmidt 42552f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42562f232036SJan Schmidt if (IS_ERR(qsa)) { 42572f232036SJan Schmidt ret = PTR_ERR(qsa); 42582f232036SJan Schmidt goto drop_write; 42592f232036SJan Schmidt } 42602f232036SJan Schmidt 42612f232036SJan Schmidt if (qsa->flags) { 42622f232036SJan Schmidt ret = -EINVAL; 42632f232036SJan Schmidt goto out; 42642f232036SJan Schmidt } 42652f232036SJan Schmidt 42662f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 42672f232036SJan Schmidt 42682f232036SJan Schmidt out: 42692f232036SJan Schmidt kfree(qsa); 42702f232036SJan Schmidt drop_write: 42712f232036SJan Schmidt mnt_drop_write_file(file); 42722f232036SJan Schmidt return ret; 42732f232036SJan Schmidt } 42742f232036SJan Schmidt 42752f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 42762f232036SJan Schmidt { 42776d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42782f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42792f232036SJan Schmidt int ret = 0; 42802f232036SJan Schmidt 42812f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42822f232036SJan Schmidt return -EPERM; 42832f232036SJan Schmidt 42842f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 42852f232036SJan Schmidt if (!qsa) 42862f232036SJan Schmidt return -ENOMEM; 42872f232036SJan Schmidt 42882f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 42892f232036SJan Schmidt qsa->flags = 1; 42902f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 42912f232036SJan Schmidt } 42922f232036SJan Schmidt 42932f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 42942f232036SJan Schmidt ret = -EFAULT; 42952f232036SJan Schmidt 42962f232036SJan Schmidt kfree(qsa); 42972f232036SJan Schmidt return ret; 42982f232036SJan Schmidt } 42992f232036SJan Schmidt 430057254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 430157254b6eSJan Schmidt { 430257254b6eSJan Schmidt struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 430357254b6eSJan Schmidt 430457254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 430557254b6eSJan Schmidt return -EPERM; 430657254b6eSJan Schmidt 430757254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 430857254b6eSJan Schmidt } 430957254b6eSJan Schmidt 43108ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 43118ea05e3aSAlexander Block void __user *arg) 43128ea05e3aSAlexander Block { 43138ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 4314496ad9aaSAl Viro struct inode *inode = file_inode(file); 43158ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43168ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43178ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 43188ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 43198ea05e3aSAlexander Block int ret = 0; 4320dd5f9615SStefan Behrens int received_uuid_changed; 43218ea05e3aSAlexander Block 43228ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43238ea05e3aSAlexander Block if (ret < 0) 43248ea05e3aSAlexander Block return ret; 43258ea05e3aSAlexander Block 43268ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 43278ea05e3aSAlexander Block 43288ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 43298ea05e3aSAlexander Block ret = -EINVAL; 43308ea05e3aSAlexander Block goto out; 43318ea05e3aSAlexander Block } 43328ea05e3aSAlexander Block 43338ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43348ea05e3aSAlexander Block ret = -EROFS; 43358ea05e3aSAlexander Block goto out; 43368ea05e3aSAlexander Block } 43378ea05e3aSAlexander Block 43388ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 43398ea05e3aSAlexander Block ret = -EACCES; 43408ea05e3aSAlexander Block goto out; 43418ea05e3aSAlexander Block } 43428ea05e3aSAlexander Block 43438ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 43448ea05e3aSAlexander Block if (IS_ERR(sa)) { 43458ea05e3aSAlexander Block ret = PTR_ERR(sa); 43468ea05e3aSAlexander Block sa = NULL; 43478ea05e3aSAlexander Block goto out; 43488ea05e3aSAlexander Block } 43498ea05e3aSAlexander Block 4350dd5f9615SStefan Behrens /* 4351dd5f9615SStefan Behrens * 1 - root item 4352dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4353dd5f9615SStefan Behrens */ 4354dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43558ea05e3aSAlexander Block if (IS_ERR(trans)) { 43568ea05e3aSAlexander Block ret = PTR_ERR(trans); 43578ea05e3aSAlexander Block trans = NULL; 43588ea05e3aSAlexander Block goto out; 43598ea05e3aSAlexander Block } 43608ea05e3aSAlexander Block 43618ea05e3aSAlexander Block sa->rtransid = trans->transid; 43628ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43638ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43648ea05e3aSAlexander Block 4365dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4366dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4367dd5f9615SStefan Behrens if (received_uuid_changed && 4368dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4369dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4370dd5f9615SStefan Behrens root_item->received_uuid, 4371dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4372dd5f9615SStefan Behrens root->root_key.objectid); 43738ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43748ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43758ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43763cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43773cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 43783cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 43793cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 43808ea05e3aSAlexander Block 43818ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 43828ea05e3aSAlexander Block &root->root_key, &root->root_item); 43838ea05e3aSAlexander Block if (ret < 0) { 43848ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 43858ea05e3aSAlexander Block goto out; 4386dd5f9615SStefan Behrens } 4387dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4388dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4389dd5f9615SStefan Behrens sa->uuid, 4390dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4391dd5f9615SStefan Behrens root->root_key.objectid); 4392dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4393dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4394dd5f9615SStefan Behrens goto out; 4395dd5f9615SStefan Behrens } 4396dd5f9615SStefan Behrens } 43978ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4398dd5f9615SStefan Behrens if (ret < 0) { 4399dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44008ea05e3aSAlexander Block goto out; 44018ea05e3aSAlexander Block } 44028ea05e3aSAlexander Block 44038ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44048ea05e3aSAlexander Block if (ret) 44058ea05e3aSAlexander Block ret = -EFAULT; 44068ea05e3aSAlexander Block 44078ea05e3aSAlexander Block out: 44088ea05e3aSAlexander Block kfree(sa); 44098ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 44108ea05e3aSAlexander Block mnt_drop_write_file(file); 44118ea05e3aSAlexander Block return ret; 44128ea05e3aSAlexander Block } 44138ea05e3aSAlexander Block 4414867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4415867ab667Sjeff.liu { 44166d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4417a1b83ac5SAnand Jain size_t len; 4418867ab667Sjeff.liu int ret; 4419a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4420a1b83ac5SAnand Jain 4421a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4422a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4423a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4424a1b83ac5SAnand Jain 4425a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4426867ab667Sjeff.liu 4427867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4428867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4429867ab667Sjeff.liu --len); 4430867ab667Sjeff.liu } 4431867ab667Sjeff.liu 4432867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4433867ab667Sjeff.liu 4434867ab667Sjeff.liu return ret ? -EFAULT : 0; 4435867ab667Sjeff.liu } 4436867ab667Sjeff.liu 4437a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4438a8bfd4abSjeff.liu { 44396d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4440a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4441a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4442a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4443a8bfd4abSjeff.liu int ret; 4444a8bfd4abSjeff.liu 4445a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4446a8bfd4abSjeff.liu return -EPERM; 4447a8bfd4abSjeff.liu 4448a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4449a8bfd4abSjeff.liu return -EFAULT; 4450a8bfd4abSjeff.liu 4451a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4452a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4453a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4454a8bfd4abSjeff.liu return -EINVAL; 4455a8bfd4abSjeff.liu } 4456a8bfd4abSjeff.liu 4457a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4458a8bfd4abSjeff.liu if (ret) 4459a8bfd4abSjeff.liu return ret; 4460a8bfd4abSjeff.liu 4461a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4462a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4463a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4464a8bfd4abSjeff.liu goto out_unlock; 4465a8bfd4abSjeff.liu } 4466a8bfd4abSjeff.liu 4467a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4468a8bfd4abSjeff.liu strcpy(super_block->label, label); 4469a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4470a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4471a8bfd4abSjeff.liu 4472a8bfd4abSjeff.liu out_unlock: 4473a8bfd4abSjeff.liu mnt_drop_write_file(file); 4474a8bfd4abSjeff.liu return ret; 4475a8bfd4abSjeff.liu } 4476a8bfd4abSjeff.liu 4477f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4478f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4479f46b5a66SChristoph Hellwig { 4480496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44814bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4482f46b5a66SChristoph Hellwig 4483f46b5a66SChristoph Hellwig switch (cmd) { 44846cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 44856cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 44866cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 44876cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 44886cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 44896cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4490f7039b1dSLi Dongyang case FITRIM: 4491f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4492f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4493fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4494fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4495fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 44963de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4497fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 44986f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 44996f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 450076dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 450176dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 45020caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45030caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 45040caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45050caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45066ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45076ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4508f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45091e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45101e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45111e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4512f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4513198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4514f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45154bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4516f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4517da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4518475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4519475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4520475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4521475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4522f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 45239ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4524f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4525c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4526c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 45277a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4528f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4529f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4530f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4531f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4532ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4533ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4534ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4535ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4536d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4537d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4538d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4539d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 45401406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45411406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 45429b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 45439b199859SFilipe David Borba Manana int ret; 45449b199859SFilipe David Borba Manana 45459b199859SFilipe David Borba Manana ret = btrfs_start_all_delalloc_inodes(root->fs_info, 0); 45469b199859SFilipe David Borba Manana if (ret) 45479b199859SFilipe David Borba Manana return ret; 45489b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 45499b199859SFilipe David Borba Manana return ret; 45509b199859SFilipe David Borba Manana } 455146204592SSage Weil case BTRFS_IOC_START_SYNC: 45529a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 455346204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 45549a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4555475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4556b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4557475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4558475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4559475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4560475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4561c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 45629ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4563837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4564837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 456519a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 456619a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 45678ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 45688ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 456931db9f7cSAlexander Block case BTRFS_IOC_SEND: 457031db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4571c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4572b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 45735d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4574905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 45755d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4576905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 45775d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4578905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 45795d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4580905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 45812f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 45822f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 45832f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 45842f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 458557254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 458657254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 45873f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 45883f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4589867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4590867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4591a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4592a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4593416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4594416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 4595f46b5a66SChristoph Hellwig } 4596f46b5a66SChristoph Hellwig 4597f46b5a66SChristoph Hellwig return -ENOTTY; 4598f46b5a66SChristoph Hellwig } 4599