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 { 323*54563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_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 { 37146e0f66aSChris Mason int i; 37246e0f66aSChris Mason 37346e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 37446e0f66aSChris Mason if (uuid[i]) 37546e0f66aSChris Mason return 0; 37646e0f66aSChris Mason } 37746e0f66aSChris Mason return 1; 378dd5f9615SStefan Behrens } 379dd5f9615SStefan Behrens 380d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 381cb8e7090SChristoph Hellwig struct dentry *dentry, 38272fd032eSSage Weil char *name, int namelen, 3836f72c7e2SArne Jansen u64 *async_transid, 3848696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 385f46b5a66SChristoph Hellwig { 386f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 387f46b5a66SChristoph Hellwig struct btrfs_key key; 388f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 389f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 390f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 391d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 39276dda93cSYan, Zheng struct btrfs_root *new_root; 393d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3948ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 395f46b5a66SChristoph Hellwig int ret; 396f46b5a66SChristoph Hellwig int err; 397f46b5a66SChristoph Hellwig u64 objectid; 398f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3993de4586cSChris Mason u64 index = 0; 400d5c12070SMiao Xie u64 qgroup_reserved; 4018ea05e3aSAlexander Block uuid_le new_uuid; 402f46b5a66SChristoph Hellwig 403581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4042fbe8c8aSAl Viro if (ret) 405a22285a6SYan, Zheng return ret; 4066a912213SJosef Bacik 407d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4089ed74f2dSJosef Bacik /* 409d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 410d5c12070SMiao Xie * of create_snapshot(). 4119ed74f2dSJosef Bacik */ 412d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 413dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 414d5c12070SMiao Xie if (ret) 415d5c12070SMiao Xie return ret; 416f46b5a66SChristoph Hellwig 417d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 418d5c12070SMiao Xie if (IS_ERR(trans)) { 419d5c12070SMiao Xie ret = PTR_ERR(trans); 420d5c12070SMiao Xie goto out; 421d5c12070SMiao Xie } 422d5c12070SMiao Xie trans->block_rsv = &block_rsv; 423d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 424f46b5a66SChristoph Hellwig 4258696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4266f72c7e2SArne Jansen if (ret) 4276f72c7e2SArne Jansen goto fail; 4286f72c7e2SArne Jansen 4295d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4305581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4318e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4328e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4338e8a1e31SJosef Bacik goto fail; 4348e8a1e31SJosef Bacik } 435f46b5a66SChristoph Hellwig 4365d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 437f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 438f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4395d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 440f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 441f46b5a66SChristoph Hellwig 4420a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 443f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4445d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 445b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4465d4f98a2SYan Zheng BTRFS_UUID_SIZE); 447f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 448f46b5a66SChristoph Hellwig 4498ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4508ea05e3aSAlexander Block 451f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4523cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 4533cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 4543cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 4553cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 4563cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 457f46b5a66SChristoph Hellwig 4583cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 4593cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 4603cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 46108fe4db1SLi Zefan 462f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 46384234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 464f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 465f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 46686b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 46780ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 468f46b5a66SChristoph Hellwig 4698ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4708ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4718ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4728ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4733cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 4743cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 4758ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4768ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4778ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 478f46b5a66SChristoph Hellwig 479925baeddSChris Mason btrfs_tree_unlock(leaf); 480f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 481f46b5a66SChristoph Hellwig leaf = NULL; 482f46b5a66SChristoph Hellwig 483f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 484f46b5a66SChristoph Hellwig 485f46b5a66SChristoph Hellwig key.objectid = objectid; 4865d4f98a2SYan Zheng key.offset = 0; 487f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 488f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 489f46b5a66SChristoph Hellwig &root_item); 490f46b5a66SChristoph Hellwig if (ret) 491f46b5a66SChristoph Hellwig goto fail; 492f46b5a66SChristoph Hellwig 49376dda93cSYan, Zheng key.offset = (u64)-1; 49476dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 49579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 49679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 49779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 49879787eaaSJeff Mahoney goto fail; 49979787eaaSJeff Mahoney } 50076dda93cSYan, Zheng 50176dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 50276dda93cSYan, Zheng 503d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 504ce598979SMark Fasheh if (ret) { 505ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 50679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 507ce598979SMark Fasheh goto fail; 508ce598979SMark Fasheh } 509ce598979SMark Fasheh 510f46b5a66SChristoph Hellwig /* 511f46b5a66SChristoph Hellwig * insert the directory item 512f46b5a66SChristoph Hellwig */ 5133de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 51479787eaaSJeff Mahoney if (ret) { 51579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 51679787eaaSJeff Mahoney goto fail; 51779787eaaSJeff Mahoney } 5183de4586cSChris Mason 5193de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 52016cdcec7SMiao Xie name, namelen, dir, &key, 5213de4586cSChris Mason BTRFS_FT_DIR, index); 52279787eaaSJeff Mahoney if (ret) { 52379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 524f46b5a66SChristoph Hellwig goto fail; 52579787eaaSJeff Mahoney } 5260660b5afSChris Mason 52752c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 52852c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 52952c26179SYan Zheng BUG_ON(ret); 53052c26179SYan Zheng 5310660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5324df27c4dSYan, Zheng objectid, root->root_key.objectid, 53333345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5340660b5afSChris Mason BUG_ON(ret); 5350660b5afSChris Mason 536dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 537dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 538dd5f9615SStefan Behrens objectid); 539dd5f9615SStefan Behrens if (ret) 540dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 541dd5f9615SStefan Behrens 542f46b5a66SChristoph Hellwig fail: 543d5c12070SMiao Xie trans->block_rsv = NULL; 544d5c12070SMiao Xie trans->bytes_reserved = 0; 54572fd032eSSage Weil if (async_transid) { 54672fd032eSSage Weil *async_transid = trans->transid; 54772fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 54800d71c9cSMiao Xie if (err) 54900d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 55072fd032eSSage Weil } else { 55176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 55272fd032eSSage Weil } 553f46b5a66SChristoph Hellwig if (err && !ret) 554f46b5a66SChristoph Hellwig ret = err; 5551a65e24bSChris Mason 5561a65e24bSChris Mason if (!ret) 5571a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 558d5c12070SMiao Xie out: 559d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 560f46b5a66SChristoph Hellwig return ret; 561f46b5a66SChristoph Hellwig } 562f46b5a66SChristoph Hellwig 563e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 564e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 565e9662f70SMiao Xie u64 *async_transid, bool readonly, 566e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 567f46b5a66SChristoph Hellwig { 5682e4bfab9SYan, Zheng struct inode *inode; 569f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 570f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5712e4bfab9SYan, Zheng int ret; 572f46b5a66SChristoph Hellwig 573f46b5a66SChristoph Hellwig if (!root->ref_cows) 574f46b5a66SChristoph Hellwig return -EINVAL; 575f46b5a66SChristoph Hellwig 5766a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 5776a03843dSMiao Xie if (ret) 5786a03843dSMiao Xie return ret; 5796a03843dSMiao Xie 580b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 5816a03843dSMiao Xie 582a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 583a22285a6SYan, Zheng if (!pending_snapshot) 584a22285a6SYan, Zheng return -ENOMEM; 585a22285a6SYan, Zheng 58666d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 58766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 588d5c12070SMiao Xie /* 589d5c12070SMiao Xie * 1 - parent dir inode 590d5c12070SMiao Xie * 2 - dir entries 591d5c12070SMiao Xie * 1 - root item 592d5c12070SMiao Xie * 2 - root ref/backref 593d5c12070SMiao Xie * 1 - root of snapshot 594dd5f9615SStefan Behrens * 1 - UUID item 595d5c12070SMiao Xie */ 596d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 597dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 598ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 599ee3441b4SJeff Mahoney false); 600d5c12070SMiao Xie if (ret) 601d5c12070SMiao Xie goto out; 602d5c12070SMiao Xie 603a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 604a22285a6SYan, Zheng pending_snapshot->root = root; 605b83cc969SLi Zefan pending_snapshot->readonly = readonly; 606e9662f70SMiao Xie pending_snapshot->dir = dir; 6078696c533SMiao Xie pending_snapshot->inherit = inherit; 608a22285a6SYan, Zheng 609d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 610a22285a6SYan, Zheng if (IS_ERR(trans)) { 611a22285a6SYan, Zheng ret = PTR_ERR(trans); 612a22285a6SYan, Zheng goto fail; 613a22285a6SYan, Zheng } 614a22285a6SYan, Zheng 6158351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 616a22285a6SYan, Zheng list_add(&pending_snapshot->list, 617a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6188351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 61972fd032eSSage Weil if (async_transid) { 62072fd032eSSage Weil *async_transid = trans->transid; 62172fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 62272fd032eSSage Weil root->fs_info->extent_root, 1); 62300d71c9cSMiao Xie if (ret) 62400d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 62572fd032eSSage Weil } else { 62672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 62772fd032eSSage Weil root->fs_info->extent_root); 62872fd032eSSage Weil } 629aec8030aSMiao Xie if (ret) 630c37b2b62SJosef Bacik goto fail; 631a22285a6SYan, Zheng 632a22285a6SYan, Zheng ret = pending_snapshot->error; 633f46b5a66SChristoph Hellwig if (ret) 6342e4bfab9SYan, Zheng goto fail; 635f46b5a66SChristoph Hellwig 63666b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 63766b4ffd1SJosef Bacik if (ret) 63866b4ffd1SJosef Bacik goto fail; 639f46b5a66SChristoph Hellwig 6402fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6412e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6422e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6432e4bfab9SYan, Zheng goto fail; 6442e4bfab9SYan, Zheng } 6452e4bfab9SYan, Zheng BUG_ON(!inode); 6462e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6472e4bfab9SYan, Zheng ret = 0; 6482e4bfab9SYan, Zheng fail: 649d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 650d5c12070SMiao Xie &pending_snapshot->block_rsv, 651d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 652d5c12070SMiao Xie out: 653a22285a6SYan, Zheng kfree(pending_snapshot); 654f46b5a66SChristoph Hellwig return ret; 655f46b5a66SChristoph Hellwig } 656f46b5a66SChristoph Hellwig 6574260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6584260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6594260f7c7SSage Weil * minimal. 6604260f7c7SSage Weil */ 6614260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6624260f7c7SSage Weil { 6632f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6644260f7c7SSage Weil 6654260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6664260f7c7SSage Weil return 0; 6672f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6684260f7c7SSage Weil return 0; 6692f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6704260f7c7SSage Weil return 0; 6714260f7c7SSage Weil return !capable(CAP_FOWNER); 6724260f7c7SSage Weil } 6734260f7c7SSage Weil 6744260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6754260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6764260f7c7SSage Weil * whether the type of victim is right. 6774260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6784260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6794260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6804260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6814260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6824260f7c7SSage Weil * a. be owner of dir, or 6834260f7c7SSage Weil * b. be owner of victim, or 6844260f7c7SSage Weil * c. have CAP_FOWNER capability 6854260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6864260f7c7SSage Weil * links pointing to it. 6874260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6884260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6894260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6904260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6914260f7c7SSage Weil * nfs_async_unlink(). 6924260f7c7SSage Weil */ 6934260f7c7SSage Weil 6944260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 6954260f7c7SSage Weil { 6964260f7c7SSage Weil int error; 6974260f7c7SSage Weil 6984260f7c7SSage Weil if (!victim->d_inode) 6994260f7c7SSage Weil return -ENOENT; 7004260f7c7SSage Weil 7014260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7024fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7034260f7c7SSage Weil 7044260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7054260f7c7SSage Weil if (error) 7064260f7c7SSage Weil return error; 7074260f7c7SSage Weil if (IS_APPEND(dir)) 7084260f7c7SSage Weil return -EPERM; 7094260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7104260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7114260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7124260f7c7SSage Weil return -EPERM; 7134260f7c7SSage Weil if (isdir) { 7144260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7154260f7c7SSage Weil return -ENOTDIR; 7164260f7c7SSage Weil if (IS_ROOT(victim)) 7174260f7c7SSage Weil return -EBUSY; 7184260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7194260f7c7SSage Weil return -EISDIR; 7204260f7c7SSage Weil if (IS_DEADDIR(dir)) 7214260f7c7SSage Weil return -ENOENT; 7224260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7234260f7c7SSage Weil return -EBUSY; 7244260f7c7SSage Weil return 0; 7254260f7c7SSage Weil } 7264260f7c7SSage Weil 727cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 728cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 729cb8e7090SChristoph Hellwig { 730cb8e7090SChristoph Hellwig if (child->d_inode) 731cb8e7090SChristoph Hellwig return -EEXIST; 732cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 733cb8e7090SChristoph Hellwig return -ENOENT; 734cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 735cb8e7090SChristoph Hellwig } 736cb8e7090SChristoph Hellwig 737cb8e7090SChristoph Hellwig /* 738cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 739cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 740cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 741cb8e7090SChristoph Hellwig */ 74276dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 74376dda93cSYan, Zheng char *name, int namelen, 74472fd032eSSage Weil struct btrfs_root *snap_src, 7456f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7468696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 747cb8e7090SChristoph Hellwig { 74876dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 749cb8e7090SChristoph Hellwig struct dentry *dentry; 750cb8e7090SChristoph Hellwig int error; 751cb8e7090SChristoph Hellwig 7525c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7535c50c9b8SDavid Sterba if (error == -EINTR) 7545c50c9b8SDavid Sterba return error; 755cb8e7090SChristoph Hellwig 756cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 757cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 758cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 759cb8e7090SChristoph Hellwig goto out_unlock; 760cb8e7090SChristoph Hellwig 761cb8e7090SChristoph Hellwig error = -EEXIST; 762cb8e7090SChristoph Hellwig if (dentry->d_inode) 763cb8e7090SChristoph Hellwig goto out_dput; 764cb8e7090SChristoph Hellwig 76576dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 766cb8e7090SChristoph Hellwig if (error) 767a874a63eSLiu Bo goto out_dput; 768cb8e7090SChristoph Hellwig 7699c52057cSChris Mason /* 7709c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7719c52057cSChris Mason * check for them now when we can safely fail 7729c52057cSChris Mason */ 7739c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7749c52057cSChris Mason dir->i_ino, name, 7759c52057cSChris Mason namelen); 7769c52057cSChris Mason if (error) 7779c52057cSChris Mason goto out_dput; 7789c52057cSChris Mason 77976dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 78076dda93cSYan, Zheng 78176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 78276dda93cSYan, Zheng goto out_up_read; 78376dda93cSYan, Zheng 7843de4586cSChris Mason if (snap_src) { 785e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7866f72c7e2SArne Jansen async_transid, readonly, inherit); 7873de4586cSChris Mason } else { 788d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 789d5c12070SMiao Xie async_transid, inherit); 7903de4586cSChris Mason } 79176dda93cSYan, Zheng if (!error) 79276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 79376dda93cSYan, Zheng out_up_read: 79476dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 795cb8e7090SChristoph Hellwig out_dput: 796cb8e7090SChristoph Hellwig dput(dentry); 797cb8e7090SChristoph Hellwig out_unlock: 79876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 799cb8e7090SChristoph Hellwig return error; 800cb8e7090SChristoph Hellwig } 801cb8e7090SChristoph Hellwig 8024cb5300bSChris Mason /* 8034cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8044cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8054cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8064cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8074cb5300bSChris Mason * part of the file 8084cb5300bSChris Mason */ 8094cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8104cb5300bSChris Mason { 8114cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8124cb5300bSChris Mason struct extent_map *em = NULL; 8134cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8144cb5300bSChris Mason u64 end; 8154cb5300bSChris Mason 8164cb5300bSChris Mason read_lock(&em_tree->lock); 8174cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8184cb5300bSChris Mason read_unlock(&em_tree->lock); 8194cb5300bSChris Mason 8204cb5300bSChris Mason if (em) { 8214cb5300bSChris Mason end = extent_map_end(em); 8224cb5300bSChris Mason free_extent_map(em); 8234cb5300bSChris Mason if (end - offset > thresh) 8244cb5300bSChris Mason return 0; 8254cb5300bSChris Mason } 8264cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8274cb5300bSChris Mason thresh /= 2; 8284cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8294cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8304cb5300bSChris Mason if (end >= thresh) 8314cb5300bSChris Mason return 0; 8324cb5300bSChris Mason return 1; 8334cb5300bSChris Mason } 8344cb5300bSChris Mason 8354cb5300bSChris Mason /* 8364cb5300bSChris Mason * helper function to walk through a file and find extents 8374cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8384cb5300bSChris Mason * 8394cb5300bSChris Mason * This is used by the defragging code to find new and small 8404cb5300bSChris Mason * extents 8414cb5300bSChris Mason */ 8424cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8434cb5300bSChris Mason struct inode *inode, u64 newer_than, 8444cb5300bSChris Mason u64 *off, int thresh) 8454cb5300bSChris Mason { 8464cb5300bSChris Mason struct btrfs_path *path; 8474cb5300bSChris Mason struct btrfs_key min_key; 8484cb5300bSChris Mason struct extent_buffer *leaf; 8494cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8504cb5300bSChris Mason int type; 8514cb5300bSChris Mason int ret; 852a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8534cb5300bSChris Mason 8544cb5300bSChris Mason path = btrfs_alloc_path(); 8554cb5300bSChris Mason if (!path) 8564cb5300bSChris Mason return -ENOMEM; 8574cb5300bSChris Mason 858a4689d2bSDavid Sterba min_key.objectid = ino; 8594cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8604cb5300bSChris Mason min_key.offset = *off; 8614cb5300bSChris Mason 8624cb5300bSChris Mason path->keep_locks = 1; 8634cb5300bSChris Mason 8644cb5300bSChris Mason while (1) { 8656174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 8664cb5300bSChris Mason if (ret != 0) 8674cb5300bSChris Mason goto none; 868a4689d2bSDavid Sterba if (min_key.objectid != ino) 8694cb5300bSChris Mason goto none; 8704cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8714cb5300bSChris Mason goto none; 8724cb5300bSChris Mason 8734cb5300bSChris Mason leaf = path->nodes[0]; 8744cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8754cb5300bSChris Mason struct btrfs_file_extent_item); 8764cb5300bSChris Mason 8774cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8784cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8794cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8804cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8814cb5300bSChris Mason *off = min_key.offset; 8824cb5300bSChris Mason btrfs_free_path(path); 8834cb5300bSChris Mason return 0; 8844cb5300bSChris Mason } 8854cb5300bSChris Mason 8864cb5300bSChris Mason if (min_key.offset == (u64)-1) 8874cb5300bSChris Mason goto none; 8884cb5300bSChris Mason 8894cb5300bSChris Mason min_key.offset++; 8904cb5300bSChris Mason btrfs_release_path(path); 8914cb5300bSChris Mason } 8924cb5300bSChris Mason none: 8934cb5300bSChris Mason btrfs_free_path(path); 8944cb5300bSChris Mason return -ENOENT; 8954cb5300bSChris Mason } 8964cb5300bSChris Mason 8976c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 89817ce6ef8SLiu Bo { 89917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 900940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9016c282eb4SLi Zefan struct extent_map *em; 9026c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 903940100a4SChris Mason 904940100a4SChris Mason /* 905940100a4SChris Mason * hopefully we have this extent in the tree already, try without 906940100a4SChris Mason * the full extent lock 907940100a4SChris Mason */ 908940100a4SChris Mason read_lock(&em_tree->lock); 909940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 910940100a4SChris Mason read_unlock(&em_tree->lock); 911940100a4SChris Mason 912940100a4SChris Mason if (!em) { 913940100a4SChris Mason /* get the big lock and read metadata off disk */ 914d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 915940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 916d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 917940100a4SChris Mason 9186cf8bfbfSDan Carpenter if (IS_ERR(em)) 9196c282eb4SLi Zefan return NULL; 920940100a4SChris Mason } 921940100a4SChris Mason 9226c282eb4SLi Zefan return em; 9236c282eb4SLi Zefan } 9246c282eb4SLi Zefan 9256c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9266c282eb4SLi Zefan { 9276c282eb4SLi Zefan struct extent_map *next; 9286c282eb4SLi Zefan bool ret = true; 9296c282eb4SLi Zefan 9306c282eb4SLi Zefan /* this is the last extent */ 9316c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9326c282eb4SLi Zefan return false; 9336c282eb4SLi Zefan 9346c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9356c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9366c282eb4SLi Zefan ret = false; 9376c282eb4SLi Zefan 9386c282eb4SLi Zefan free_extent_map(next); 9396c282eb4SLi Zefan return ret; 9406c282eb4SLi Zefan } 9416c282eb4SLi Zefan 9426c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 943a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 944a43a2111SAndrew Mahone int compress) 9456c282eb4SLi Zefan { 9466c282eb4SLi Zefan struct extent_map *em; 9476c282eb4SLi Zefan int ret = 1; 9486c282eb4SLi Zefan bool next_mergeable = true; 9496c282eb4SLi Zefan 9506c282eb4SLi Zefan /* 9516c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9526c282eb4SLi Zefan * defragging it 9536c282eb4SLi Zefan */ 9546c282eb4SLi Zefan if (start < *defrag_end) 9556c282eb4SLi Zefan return 1; 9566c282eb4SLi Zefan 9576c282eb4SLi Zefan *skip = 0; 9586c282eb4SLi Zefan 9596c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9606c282eb4SLi Zefan if (!em) 9616c282eb4SLi Zefan return 0; 9626c282eb4SLi Zefan 963940100a4SChris Mason /* this will cover holes, and inline extents */ 96417ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 965940100a4SChris Mason ret = 0; 96617ce6ef8SLiu Bo goto out; 96717ce6ef8SLiu Bo } 96817ce6ef8SLiu Bo 9696c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 970940100a4SChris Mason 971940100a4SChris Mason /* 9726c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9736c282eb4SLi Zefan * real extent, don't bother defragging it 974940100a4SChris Mason */ 975a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9766c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 977940100a4SChris Mason ret = 0; 97817ce6ef8SLiu Bo out: 979940100a4SChris Mason /* 980940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 981940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 982940100a4SChris Mason * so that the next tiny extent will force a defrag. 983940100a4SChris Mason * 984940100a4SChris Mason * The end result of this is that tiny extents before a single big 985940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 986940100a4SChris Mason */ 987940100a4SChris Mason if (ret) { 988940100a4SChris Mason *defrag_end = extent_map_end(em); 989940100a4SChris Mason } else { 990940100a4SChris Mason *last_len = 0; 991940100a4SChris Mason *skip = extent_map_end(em); 992940100a4SChris Mason *defrag_end = 0; 993940100a4SChris Mason } 994940100a4SChris Mason 995940100a4SChris Mason free_extent_map(em); 996940100a4SChris Mason return ret; 997940100a4SChris Mason } 998940100a4SChris Mason 9994cb5300bSChris Mason /* 10004cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10014cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10024cb5300bSChris Mason * to COW and defrag. 10034cb5300bSChris Mason * 10044cb5300bSChris Mason * It also makes sure the delalloc code has enough 10054cb5300bSChris Mason * dirty data to avoid making new small extents as part 10064cb5300bSChris Mason * of the defrag 10074cb5300bSChris Mason * 10084cb5300bSChris Mason * It's a good idea to start RA on this range 10094cb5300bSChris Mason * before calling this. 10104cb5300bSChris Mason */ 10114cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10124cb5300bSChris Mason struct page **pages, 10134cb5300bSChris Mason unsigned long start_index, 10144cb5300bSChris Mason int num_pages) 1015f46b5a66SChristoph Hellwig { 10164cb5300bSChris Mason unsigned long file_end; 10174cb5300bSChris Mason u64 isize = i_size_read(inode); 1018f46b5a66SChristoph Hellwig u64 page_start; 1019f46b5a66SChristoph Hellwig u64 page_end; 10201f12bd06SLiu Bo u64 page_cnt; 10214cb5300bSChris Mason int ret; 10224cb5300bSChris Mason int i; 10234cb5300bSChris Mason int i_done; 10244cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10254cb5300bSChris Mason struct extent_state *cached_state = NULL; 1026600a45e1SMiao Xie struct extent_io_tree *tree; 10273b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10284cb5300bSChris Mason 10294cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10301f12bd06SLiu Bo if (!isize || start_index > file_end) 10311f12bd06SLiu Bo return 0; 10321f12bd06SLiu Bo 10331f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10344cb5300bSChris Mason 10354cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10361f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10374cb5300bSChris Mason if (ret) 10384cb5300bSChris Mason return ret; 10394cb5300bSChris Mason i_done = 0; 1040600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10414cb5300bSChris Mason 10424cb5300bSChris Mason /* step one, lock all the pages */ 10431f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10444cb5300bSChris Mason struct page *page; 1045600a45e1SMiao Xie again: 1046a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10473b16a4e3SJosef Bacik start_index + i, mask); 10484cb5300bSChris Mason if (!page) 10494cb5300bSChris Mason break; 10504cb5300bSChris Mason 1051600a45e1SMiao Xie page_start = page_offset(page); 1052600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1053600a45e1SMiao Xie while (1) { 1054d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1055600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1056600a45e1SMiao Xie page_start); 1057d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1058600a45e1SMiao Xie if (!ordered) 1059600a45e1SMiao Xie break; 1060600a45e1SMiao Xie 1061600a45e1SMiao Xie unlock_page(page); 1062600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1063600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1064600a45e1SMiao Xie lock_page(page); 10651f12bd06SLiu Bo /* 10661f12bd06SLiu Bo * we unlocked the page above, so we need check if 10671f12bd06SLiu Bo * it was released or not. 10681f12bd06SLiu Bo */ 10691f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10701f12bd06SLiu Bo unlock_page(page); 10711f12bd06SLiu Bo page_cache_release(page); 10721f12bd06SLiu Bo goto again; 10731f12bd06SLiu Bo } 1074600a45e1SMiao Xie } 1075600a45e1SMiao Xie 10764cb5300bSChris Mason if (!PageUptodate(page)) { 10774cb5300bSChris Mason btrfs_readpage(NULL, page); 10784cb5300bSChris Mason lock_page(page); 10794cb5300bSChris Mason if (!PageUptodate(page)) { 10804cb5300bSChris Mason unlock_page(page); 10814cb5300bSChris Mason page_cache_release(page); 10824cb5300bSChris Mason ret = -EIO; 10834cb5300bSChris Mason break; 10844cb5300bSChris Mason } 10854cb5300bSChris Mason } 1086600a45e1SMiao Xie 1087600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1088600a45e1SMiao Xie unlock_page(page); 1089600a45e1SMiao Xie page_cache_release(page); 1090600a45e1SMiao Xie goto again; 1091600a45e1SMiao Xie } 1092600a45e1SMiao Xie 10934cb5300bSChris Mason pages[i] = page; 10944cb5300bSChris Mason i_done++; 10954cb5300bSChris Mason } 10964cb5300bSChris Mason if (!i_done || ret) 10974cb5300bSChris Mason goto out; 10984cb5300bSChris Mason 10994cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11004cb5300bSChris Mason goto out; 11014cb5300bSChris Mason 11024cb5300bSChris Mason /* 11034cb5300bSChris Mason * so now we have a nice long stream of locked 11044cb5300bSChris Mason * and up to date pages, lets wait on them 11054cb5300bSChris Mason */ 11064cb5300bSChris Mason for (i = 0; i < i_done; i++) 11074cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11084cb5300bSChris Mason 11094cb5300bSChris Mason page_start = page_offset(pages[0]); 11104cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11114cb5300bSChris Mason 11124cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1113d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11144cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11154cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11169e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11179e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11184cb5300bSChris Mason 11191f12bd06SLiu Bo if (i_done != page_cnt) { 11209e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11219e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11229e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11234cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11241f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11254cb5300bSChris Mason } 11264cb5300bSChris Mason 11274cb5300bSChris Mason 11289e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11299e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11304cb5300bSChris Mason 11314cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11324cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11334cb5300bSChris Mason GFP_NOFS); 11344cb5300bSChris Mason 11354cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11364cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11374cb5300bSChris Mason ClearPageChecked(pages[i]); 11384cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11394cb5300bSChris Mason set_page_dirty(pages[i]); 11404cb5300bSChris Mason unlock_page(pages[i]); 11414cb5300bSChris Mason page_cache_release(pages[i]); 11424cb5300bSChris Mason } 11434cb5300bSChris Mason return i_done; 11444cb5300bSChris Mason out: 11454cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11464cb5300bSChris Mason unlock_page(pages[i]); 11474cb5300bSChris Mason page_cache_release(pages[i]); 11484cb5300bSChris Mason } 11491f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11504cb5300bSChris Mason return ret; 11514cb5300bSChris Mason 11524cb5300bSChris Mason } 11534cb5300bSChris Mason 11544cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11554cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11564cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11574cb5300bSChris Mason { 11584cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11594cb5300bSChris Mason struct file_ra_state *ra = NULL; 11604cb5300bSChris Mason unsigned long last_index; 1161151a31b2SLi Zefan u64 isize = i_size_read(inode); 1162940100a4SChris Mason u64 last_len = 0; 1163940100a4SChris Mason u64 skip = 0; 1164940100a4SChris Mason u64 defrag_end = 0; 11654cb5300bSChris Mason u64 newer_off = range->start; 1166f46b5a66SChristoph Hellwig unsigned long i; 1167008873eaSLi Zefan unsigned long ra_index = 0; 1168f46b5a66SChristoph Hellwig int ret; 11694cb5300bSChris Mason int defrag_count = 0; 11701a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11714cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1172008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1173008873eaSLi Zefan int cluster = max_cluster; 11744cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11754cb5300bSChris Mason struct page **pages = NULL; 11764cb5300bSChris Mason 11770abd5b17SLiu Bo if (isize == 0) 11780abd5b17SLiu Bo return 0; 11790abd5b17SLiu Bo 11800abd5b17SLiu Bo if (range->start >= isize) 11810abd5b17SLiu Bo return -EINVAL; 11821a419d85SLi Zefan 11831a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11841a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11851a419d85SLi Zefan return -EINVAL; 11861a419d85SLi Zefan if (range->compress_type) 11871a419d85SLi Zefan compress_type = range->compress_type; 11881a419d85SLi Zefan } 1189f46b5a66SChristoph Hellwig 11900abd5b17SLiu Bo if (extent_thresh == 0) 11910abd5b17SLiu Bo extent_thresh = 256 * 1024; 1192f46b5a66SChristoph Hellwig 11934cb5300bSChris Mason /* 11944cb5300bSChris Mason * if we were not given a file, allocate a readahead 11954cb5300bSChris Mason * context 11964cb5300bSChris Mason */ 11974cb5300bSChris Mason if (!file) { 11984cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11994cb5300bSChris Mason if (!ra) 12004cb5300bSChris Mason return -ENOMEM; 12014cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12024cb5300bSChris Mason } else { 12034cb5300bSChris Mason ra = &file->f_ra; 12044cb5300bSChris Mason } 12054cb5300bSChris Mason 1206d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12074cb5300bSChris Mason GFP_NOFS); 12084cb5300bSChris Mason if (!pages) { 12094cb5300bSChris Mason ret = -ENOMEM; 12104cb5300bSChris Mason goto out_ra; 12114cb5300bSChris Mason } 12124cb5300bSChris Mason 12134cb5300bSChris Mason /* find the last page to defrag */ 12141e701a32SChris Mason if (range->start + range->len > range->start) { 1215151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12161e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12171e701a32SChris Mason } else { 1218151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12191e701a32SChris Mason } 12201e701a32SChris Mason 12214cb5300bSChris Mason if (newer_than) { 12224cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12234cb5300bSChris Mason &newer_off, 64 * 1024); 12244cb5300bSChris Mason if (!ret) { 12254cb5300bSChris Mason range->start = newer_off; 12264cb5300bSChris Mason /* 12274cb5300bSChris Mason * we always align our defrag to help keep 12284cb5300bSChris Mason * the extents in the file evenly spaced 12294cb5300bSChris Mason */ 12304cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12314cb5300bSChris Mason } else 12324cb5300bSChris Mason goto out_ra; 12334cb5300bSChris Mason } else { 12341e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12354cb5300bSChris Mason } 12364cb5300bSChris Mason if (!max_to_defrag) 12377ec31b54SLiu Bo max_to_defrag = last_index + 1; 12384cb5300bSChris Mason 12392a0f7f57SLi Zefan /* 12402a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12412a0f7f57SLi Zefan * written sequentially. 12422a0f7f57SLi Zefan */ 12432a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12442a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12452a0f7f57SLi Zefan 1246f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1247f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1248f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12494cb5300bSChris Mason /* 12504cb5300bSChris Mason * make sure we stop running if someone unmounts 12514cb5300bSChris Mason * the FS 12524cb5300bSChris Mason */ 12534cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12544cb5300bSChris Mason break; 12554cb5300bSChris Mason 1256210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1257210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1258210549ebSDavid Sterba ret = -EAGAIN; 1259210549ebSDavid Sterba break; 1260210549ebSDavid Sterba } 1261210549ebSDavid Sterba 126266c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12636c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1264a43a2111SAndrew Mahone &defrag_end, range->flags & 1265a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1266940100a4SChris Mason unsigned long next; 1267940100a4SChris Mason /* 1268940100a4SChris Mason * the should_defrag function tells us how much to skip 1269940100a4SChris Mason * bump our counter by the suggested amount 1270940100a4SChris Mason */ 1271940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1272940100a4SChris Mason i = max(i + 1, next); 1273940100a4SChris Mason continue; 1274940100a4SChris Mason } 1275008873eaSLi Zefan 1276008873eaSLi Zefan if (!newer_than) { 1277008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1278008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1279008873eaSLi Zefan cluster = min(cluster, max_cluster); 1280008873eaSLi Zefan } else { 1281008873eaSLi Zefan cluster = max_cluster; 1282008873eaSLi Zefan } 1283008873eaSLi Zefan 1284008873eaSLi Zefan if (i + cluster > ra_index) { 1285008873eaSLi Zefan ra_index = max(i, ra_index); 1286008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1287008873eaSLi Zefan cluster); 1288008873eaSLi Zefan ra_index += max_cluster; 1289008873eaSLi Zefan } 12904cb5300bSChris Mason 1291ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1292633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1293633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1294008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1295ecb8bea8SLiu Bo if (ret < 0) { 1296ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12974cb5300bSChris Mason goto out_ra; 1298ecb8bea8SLiu Bo } 12994cb5300bSChris Mason 13004cb5300bSChris Mason defrag_count += ret; 1301d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1302ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13034cb5300bSChris Mason 13044cb5300bSChris Mason if (newer_than) { 13054cb5300bSChris Mason if (newer_off == (u64)-1) 13064cb5300bSChris Mason break; 13074cb5300bSChris Mason 1308e1f041e1SLiu Bo if (ret > 0) 1309e1f041e1SLiu Bo i += ret; 1310e1f041e1SLiu Bo 13114cb5300bSChris Mason newer_off = max(newer_off + 1, 13124cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13134cb5300bSChris Mason 13144cb5300bSChris Mason ret = find_new_extents(root, inode, 13154cb5300bSChris Mason newer_than, &newer_off, 13164cb5300bSChris Mason 64 * 1024); 13174cb5300bSChris Mason if (!ret) { 13184cb5300bSChris Mason range->start = newer_off; 13194cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13204cb5300bSChris Mason } else { 13214cb5300bSChris Mason break; 1322940100a4SChris Mason } 13234cb5300bSChris Mason } else { 1324008873eaSLi Zefan if (ret > 0) { 1325cbcc8326SLi Zefan i += ret; 1326008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1327008873eaSLi Zefan } else { 1328940100a4SChris Mason i++; 1329008873eaSLi Zefan last_len = 0; 1330008873eaSLi Zefan } 1331f46b5a66SChristoph Hellwig } 13324cb5300bSChris Mason } 1333f46b5a66SChristoph Hellwig 13341e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13351e701a32SChris Mason filemap_flush(inode->i_mapping); 13361e701a32SChris Mason 13371e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13381e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13391e701a32SChris Mason * we have to make sure the IO is actually started and that 13401e701a32SChris Mason * ordered extents get created before we return 13411e701a32SChris Mason */ 13421e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13431e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13441e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13451e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13461e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13471e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13481e701a32SChris Mason } 13491e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13501e701a32SChris Mason } 13511e701a32SChris Mason 13521a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13532b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13541a419d85SLi Zefan } 13551a419d85SLi Zefan 135660ccf82fSDiego Calleja ret = defrag_count; 1357940100a4SChris Mason 13584cb5300bSChris Mason out_ra: 1359633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1360633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1361633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1362633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1363633085c7SFilipe David Borba Manana } 13644cb5300bSChris Mason if (!file) 13654cb5300bSChris Mason kfree(ra); 13664cb5300bSChris Mason kfree(pages); 1367940100a4SChris Mason return ret; 1368f46b5a66SChristoph Hellwig } 1369f46b5a66SChristoph Hellwig 1370198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 137176dda93cSYan, Zheng void __user *arg) 1372f46b5a66SChristoph Hellwig { 1373f46b5a66SChristoph Hellwig u64 new_size; 1374f46b5a66SChristoph Hellwig u64 old_size; 1375f46b5a66SChristoph Hellwig u64 devid = 1; 1376496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1377f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1378f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1379f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1380f46b5a66SChristoph Hellwig char *sizestr; 1381f46b5a66SChristoph Hellwig char *devstr = NULL; 1382f46b5a66SChristoph Hellwig int ret = 0; 1383f46b5a66SChristoph Hellwig int mod = 0; 1384f46b5a66SChristoph Hellwig 1385e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1386e441d54dSChris Mason return -EPERM; 1387e441d54dSChris Mason 1388198605a8SMiao Xie ret = mnt_want_write_file(file); 1389198605a8SMiao Xie if (ret) 1390198605a8SMiao Xie return ret; 1391198605a8SMiao Xie 13925ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13935ac00addSStefan Behrens 1)) { 139497547676SMiao Xie mnt_drop_write_file(file); 1395e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1396c9e9f97bSIlya Dryomov } 1397c9e9f97bSIlya Dryomov 13985ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1399dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1400c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1401c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1402c9e9f97bSIlya Dryomov goto out; 1403c9e9f97bSIlya Dryomov } 14045516e595SMark Fasheh 14055516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1406f46b5a66SChristoph Hellwig 1407f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1408f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1409f46b5a66SChristoph Hellwig if (devstr) { 1410f46b5a66SChristoph Hellwig char *end; 1411f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1412f46b5a66SChristoph Hellwig *devstr = '\0'; 1413f46b5a66SChristoph Hellwig devstr = vol_args->name; 1414f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1415dfd79829SMiao Xie if (!devid) { 1416dfd79829SMiao Xie ret = -EINVAL; 1417dfd79829SMiao Xie goto out_free; 1418dfd79829SMiao Xie } 1419c1c9ff7cSGeert Uytterhoeven printk(KERN_INFO "btrfs: resizing devid %llu\n", devid); 1420f46b5a66SChristoph Hellwig } 1421dba60f3fSMiao Xie 1422aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1423f46b5a66SChristoph Hellwig if (!device) { 14245bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 1425c1c9ff7cSGeert Uytterhoeven devid); 1426dfd79829SMiao Xie ret = -ENODEV; 1427c9e9f97bSIlya Dryomov goto out_free; 1428f46b5a66SChristoph Hellwig } 1429dba60f3fSMiao Xie 1430dba60f3fSMiao Xie if (!device->writeable) { 14314e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1432dba60f3fSMiao Xie "readonly device %llu\n", 1433c1c9ff7cSGeert Uytterhoeven devid); 1434dfd79829SMiao Xie ret = -EPERM; 14354e42ae1bSLiu Bo goto out_free; 14364e42ae1bSLiu Bo } 14374e42ae1bSLiu Bo 1438f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1439f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1440f46b5a66SChristoph Hellwig else { 1441f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1442f46b5a66SChristoph Hellwig mod = -1; 1443f46b5a66SChristoph Hellwig sizestr++; 1444f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1445f46b5a66SChristoph Hellwig mod = 1; 1446f46b5a66SChristoph Hellwig sizestr++; 1447f46b5a66SChristoph Hellwig } 144891748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1449f46b5a66SChristoph Hellwig if (new_size == 0) { 1450f46b5a66SChristoph Hellwig ret = -EINVAL; 1451c9e9f97bSIlya Dryomov goto out_free; 1452f46b5a66SChristoph Hellwig } 1453f46b5a66SChristoph Hellwig } 1454f46b5a66SChristoph Hellwig 145563a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1456dfd79829SMiao Xie ret = -EPERM; 145763a212abSStefan Behrens goto out_free; 145863a212abSStefan Behrens } 145963a212abSStefan Behrens 1460f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1461f46b5a66SChristoph Hellwig 1462f46b5a66SChristoph Hellwig if (mod < 0) { 1463f46b5a66SChristoph Hellwig if (new_size > old_size) { 1464f46b5a66SChristoph Hellwig ret = -EINVAL; 1465c9e9f97bSIlya Dryomov goto out_free; 1466f46b5a66SChristoph Hellwig } 1467f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1468f46b5a66SChristoph Hellwig } else if (mod > 0) { 1469f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1470f46b5a66SChristoph Hellwig } 1471f46b5a66SChristoph Hellwig 1472f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1473f46b5a66SChristoph Hellwig ret = -EINVAL; 1474c9e9f97bSIlya Dryomov goto out_free; 1475f46b5a66SChristoph Hellwig } 1476f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1477f46b5a66SChristoph Hellwig ret = -EFBIG; 1478c9e9f97bSIlya Dryomov goto out_free; 1479f46b5a66SChristoph Hellwig } 1480f46b5a66SChristoph Hellwig 1481f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1482f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1483f46b5a66SChristoph Hellwig 1484606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1485c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1486f46b5a66SChristoph Hellwig 1487f46b5a66SChristoph Hellwig if (new_size > old_size) { 1488a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 148998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 149098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1491c9e9f97bSIlya Dryomov goto out_free; 149298d5dc13STsutomu Itoh } 1493f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1494f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1495ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1496f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14970253f40eSjeff.liu } /* equal, nothing need to do */ 1498f46b5a66SChristoph Hellwig 1499c9e9f97bSIlya Dryomov out_free: 1500f46b5a66SChristoph Hellwig kfree(vol_args); 1501c9e9f97bSIlya Dryomov out: 1502c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15035ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 150418f39c41SIlya Dryomov mnt_drop_write_file(file); 1505f46b5a66SChristoph Hellwig return ret; 1506f46b5a66SChristoph Hellwig } 1507f46b5a66SChristoph Hellwig 150872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15096f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15106f72c7e2SArne Jansen u64 *transid, bool readonly, 15118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1512f46b5a66SChristoph Hellwig { 1513f46b5a66SChristoph Hellwig int namelen; 15143de4586cSChris Mason int ret = 0; 1515f46b5a66SChristoph Hellwig 1516a874a63eSLiu Bo ret = mnt_want_write_file(file); 1517a874a63eSLiu Bo if (ret) 1518a874a63eSLiu Bo goto out; 1519a874a63eSLiu Bo 152072fd032eSSage Weil namelen = strlen(name); 152172fd032eSSage Weil if (strchr(name, '/')) { 1522f46b5a66SChristoph Hellwig ret = -EINVAL; 1523a874a63eSLiu Bo goto out_drop_write; 1524f46b5a66SChristoph Hellwig } 1525f46b5a66SChristoph Hellwig 152616780cabSChris Mason if (name[0] == '.' && 152716780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 152816780cabSChris Mason ret = -EEXIST; 1529a874a63eSLiu Bo goto out_drop_write; 153016780cabSChris Mason } 153116780cabSChris Mason 15323de4586cSChris Mason if (subvol) { 153372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15346f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1535cb8e7090SChristoph Hellwig } else { 15362903ff01SAl Viro struct fd src = fdget(fd); 15373de4586cSChris Mason struct inode *src_inode; 15382903ff01SAl Viro if (!src.file) { 15393de4586cSChris Mason ret = -EINVAL; 1540a874a63eSLiu Bo goto out_drop_write; 15413de4586cSChris Mason } 15423de4586cSChris Mason 1543496ad9aaSAl Viro src_inode = file_inode(src.file); 1544496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1545d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1546d397712bSChris Mason "another FS\n"); 15473de4586cSChris Mason ret = -EINVAL; 1548ecd18815SAl Viro } else { 154972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 155072fd032eSSage Weil BTRFS_I(src_inode)->root, 15516f72c7e2SArne Jansen transid, readonly, inherit); 1552ecd18815SAl Viro } 15532903ff01SAl Viro fdput(src); 1554cb8e7090SChristoph Hellwig } 1555a874a63eSLiu Bo out_drop_write: 1556a874a63eSLiu Bo mnt_drop_write_file(file); 1557f46b5a66SChristoph Hellwig out: 155872fd032eSSage Weil return ret; 155972fd032eSSage Weil } 156072fd032eSSage Weil 156172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1562fa0d2b9bSLi Zefan void __user *arg, int subvol) 156372fd032eSSage Weil { 1564fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 156572fd032eSSage Weil int ret; 156672fd032eSSage Weil 1567fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1568fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1569fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1570fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1571fa0d2b9bSLi Zefan 1572fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1573b83cc969SLi Zefan vol_args->fd, subvol, 15746f72c7e2SArne Jansen NULL, false, NULL); 1575fa0d2b9bSLi Zefan 1576fa0d2b9bSLi Zefan kfree(vol_args); 1577fa0d2b9bSLi Zefan return ret; 1578fa0d2b9bSLi Zefan } 1579fa0d2b9bSLi Zefan 1580fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1581fa0d2b9bSLi Zefan void __user *arg, int subvol) 1582fa0d2b9bSLi Zefan { 1583fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1584fa0d2b9bSLi Zefan int ret; 1585fdfb1e4fSLi Zefan u64 transid = 0; 1586fdfb1e4fSLi Zefan u64 *ptr = NULL; 1587b83cc969SLi Zefan bool readonly = false; 15886f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 158972fd032eSSage Weil 1590fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1591fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1592fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1593fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1594fdfb1e4fSLi Zefan 1595b83cc969SLi Zefan if (vol_args->flags & 15966f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15976f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1598b83cc969SLi Zefan ret = -EOPNOTSUPP; 1599fdfb1e4fSLi Zefan goto out; 1600fdfb1e4fSLi Zefan } 1601fdfb1e4fSLi Zefan 1602fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1603fdfb1e4fSLi Zefan ptr = &transid; 1604b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1605b83cc969SLi Zefan readonly = true; 16066f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16076f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16086f72c7e2SArne Jansen ret = -EINVAL; 16096f72c7e2SArne Jansen goto out; 16106f72c7e2SArne Jansen } 16116f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16126f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16136f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16146f72c7e2SArne Jansen goto out; 16156f72c7e2SArne Jansen } 16166f72c7e2SArne Jansen } 161775eaa0e2SSage Weil 1618fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16196f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16208696c533SMiao Xie readonly, inherit); 162175eaa0e2SSage Weil 1622fdfb1e4fSLi Zefan if (ret == 0 && ptr && 162375eaa0e2SSage Weil copy_to_user(arg + 1624fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1625fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 162675eaa0e2SSage Weil ret = -EFAULT; 1627fdfb1e4fSLi Zefan out: 1628f46b5a66SChristoph Hellwig kfree(vol_args); 16296f72c7e2SArne Jansen kfree(inherit); 1630f46b5a66SChristoph Hellwig return ret; 1631f46b5a66SChristoph Hellwig } 1632f46b5a66SChristoph Hellwig 16330caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16340caa102dSLi Zefan void __user *arg) 16350caa102dSLi Zefan { 1636496ad9aaSAl Viro struct inode *inode = file_inode(file); 16370caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16380caa102dSLi Zefan int ret = 0; 16390caa102dSLi Zefan u64 flags = 0; 16400caa102dSLi Zefan 164133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16420caa102dSLi Zefan return -EINVAL; 16430caa102dSLi Zefan 16440caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16450caa102dSLi Zefan if (btrfs_root_readonly(root)) 16460caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16470caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16480caa102dSLi Zefan 16490caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16500caa102dSLi Zefan ret = -EFAULT; 16510caa102dSLi Zefan 16520caa102dSLi Zefan return ret; 16530caa102dSLi Zefan } 16540caa102dSLi Zefan 16550caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16560caa102dSLi Zefan void __user *arg) 16570caa102dSLi Zefan { 1658496ad9aaSAl Viro struct inode *inode = file_inode(file); 16590caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16600caa102dSLi Zefan struct btrfs_trans_handle *trans; 16610caa102dSLi Zefan u64 root_flags; 16620caa102dSLi Zefan u64 flags; 16630caa102dSLi Zefan int ret = 0; 16640caa102dSLi Zefan 1665b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1666b9ca0664SLiu Bo if (ret) 1667b9ca0664SLiu Bo goto out; 16680caa102dSLi Zefan 1669b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1670b9ca0664SLiu Bo ret = -EINVAL; 1671b9ca0664SLiu Bo goto out_drop_write; 1672b9ca0664SLiu Bo } 16730caa102dSLi Zefan 1674b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1675b9ca0664SLiu Bo ret = -EFAULT; 1676b9ca0664SLiu Bo goto out_drop_write; 1677b9ca0664SLiu Bo } 16780caa102dSLi Zefan 1679b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1680b9ca0664SLiu Bo ret = -EINVAL; 1681b9ca0664SLiu Bo goto out_drop_write; 1682b9ca0664SLiu Bo } 16830caa102dSLi Zefan 1684b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1685b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1686b9ca0664SLiu Bo goto out_drop_write; 1687b9ca0664SLiu Bo } 16880caa102dSLi Zefan 1689b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1690b9ca0664SLiu Bo ret = -EACCES; 1691b9ca0664SLiu Bo goto out_drop_write; 1692b9ca0664SLiu Bo } 1693b4dc2b8cSLi Zefan 16940caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16950caa102dSLi Zefan 16960caa102dSLi Zefan /* nothing to do */ 16970caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1698b9ca0664SLiu Bo goto out_drop_sem; 16990caa102dSLi Zefan 17000caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17010caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 17020caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17030caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17040caa102dSLi Zefan else 17050caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17060caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17070caa102dSLi Zefan 17080caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17090caa102dSLi Zefan if (IS_ERR(trans)) { 17100caa102dSLi Zefan ret = PTR_ERR(trans); 17110caa102dSLi Zefan goto out_reset; 17120caa102dSLi Zefan } 17130caa102dSLi Zefan 1714b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17150caa102dSLi Zefan &root->root_key, &root->root_item); 17160caa102dSLi Zefan 17170caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17180caa102dSLi Zefan out_reset: 17190caa102dSLi Zefan if (ret) 17200caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1721b9ca0664SLiu Bo out_drop_sem: 17220caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1723b9ca0664SLiu Bo out_drop_write: 1724b9ca0664SLiu Bo mnt_drop_write_file(file); 1725b9ca0664SLiu Bo out: 17260caa102dSLi Zefan return ret; 17270caa102dSLi Zefan } 17280caa102dSLi Zefan 172976dda93cSYan, Zheng /* 173076dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 173176dda93cSYan, Zheng */ 173276dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 173376dda93cSYan, Zheng { 173476dda93cSYan, Zheng struct btrfs_path *path; 1735175a2b87SJosef Bacik struct btrfs_dir_item *di; 173676dda93cSYan, Zheng struct btrfs_key key; 1737175a2b87SJosef Bacik u64 dir_id; 173876dda93cSYan, Zheng int ret; 173976dda93cSYan, Zheng 174076dda93cSYan, Zheng path = btrfs_alloc_path(); 174176dda93cSYan, Zheng if (!path) 174276dda93cSYan, Zheng return -ENOMEM; 174376dda93cSYan, Zheng 1744175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1745175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1746175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1747175a2b87SJosef Bacik dir_id, "default", 7, 0); 1748175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1749175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1750175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1751175a2b87SJosef Bacik ret = -ENOTEMPTY; 1752175a2b87SJosef Bacik goto out; 1753175a2b87SJosef Bacik } 1754175a2b87SJosef Bacik btrfs_release_path(path); 1755175a2b87SJosef Bacik } 1756175a2b87SJosef Bacik 175776dda93cSYan, Zheng key.objectid = root->root_key.objectid; 175876dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 175976dda93cSYan, Zheng key.offset = (u64)-1; 176076dda93cSYan, Zheng 176176dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 176276dda93cSYan, Zheng &key, path, 0, 0); 176376dda93cSYan, Zheng if (ret < 0) 176476dda93cSYan, Zheng goto out; 176576dda93cSYan, Zheng BUG_ON(ret == 0); 176676dda93cSYan, Zheng 176776dda93cSYan, Zheng ret = 0; 176876dda93cSYan, Zheng if (path->slots[0] > 0) { 176976dda93cSYan, Zheng path->slots[0]--; 177076dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 177176dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 177276dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 177376dda93cSYan, Zheng ret = -ENOTEMPTY; 177476dda93cSYan, Zheng } 177576dda93cSYan, Zheng out: 177676dda93cSYan, Zheng btrfs_free_path(path); 177776dda93cSYan, Zheng return ret; 177876dda93cSYan, Zheng } 177976dda93cSYan, Zheng 1780ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1781ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1782ac8e9819SChris Mason { 1783abc6e134SChris Mason struct btrfs_key test; 1784abc6e134SChris Mason int ret; 1785abc6e134SChris Mason 1786abc6e134SChris Mason test.objectid = sk->min_objectid; 1787abc6e134SChris Mason test.type = sk->min_type; 1788abc6e134SChris Mason test.offset = sk->min_offset; 1789abc6e134SChris Mason 1790abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1791abc6e134SChris Mason if (ret < 0) 1792ac8e9819SChris Mason return 0; 1793abc6e134SChris Mason 1794abc6e134SChris Mason test.objectid = sk->max_objectid; 1795abc6e134SChris Mason test.type = sk->max_type; 1796abc6e134SChris Mason test.offset = sk->max_offset; 1797abc6e134SChris Mason 1798abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1799abc6e134SChris Mason if (ret > 0) 1800ac8e9819SChris Mason return 0; 1801ac8e9819SChris Mason return 1; 1802ac8e9819SChris Mason } 1803ac8e9819SChris Mason 1804ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1805ac8e9819SChris Mason struct btrfs_path *path, 1806ac8e9819SChris Mason struct btrfs_key *key, 1807ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1808ac8e9819SChris Mason char *buf, 1809ac8e9819SChris Mason unsigned long *sk_offset, 1810ac8e9819SChris Mason int *num_found) 1811ac8e9819SChris Mason { 1812ac8e9819SChris Mason u64 found_transid; 1813ac8e9819SChris Mason struct extent_buffer *leaf; 1814ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1815ac8e9819SChris Mason unsigned long item_off; 1816ac8e9819SChris Mason unsigned long item_len; 1817ac8e9819SChris Mason int nritems; 1818ac8e9819SChris Mason int i; 1819ac8e9819SChris Mason int slot; 1820ac8e9819SChris Mason int ret = 0; 1821ac8e9819SChris Mason 1822ac8e9819SChris Mason leaf = path->nodes[0]; 1823ac8e9819SChris Mason slot = path->slots[0]; 1824ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1825ac8e9819SChris Mason 1826ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1827ac8e9819SChris Mason i = nritems; 1828ac8e9819SChris Mason goto advance_key; 1829ac8e9819SChris Mason } 1830ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1831ac8e9819SChris Mason 1832ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1833ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1834ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1835ac8e9819SChris Mason 183603b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 183703b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 183803b71c6cSGabriel de Perthuis continue; 183903b71c6cSGabriel de Perthuis 184003b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1841ac8e9819SChris Mason item_len = 0; 1842ac8e9819SChris Mason 1843ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1844ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1845ac8e9819SChris Mason ret = 1; 1846ac8e9819SChris Mason goto overflow; 1847ac8e9819SChris Mason } 1848ac8e9819SChris Mason 1849ac8e9819SChris Mason sh.objectid = key->objectid; 1850ac8e9819SChris Mason sh.offset = key->offset; 1851ac8e9819SChris Mason sh.type = key->type; 1852ac8e9819SChris Mason sh.len = item_len; 1853ac8e9819SChris Mason sh.transid = found_transid; 1854ac8e9819SChris Mason 1855ac8e9819SChris Mason /* copy search result header */ 1856ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1857ac8e9819SChris Mason *sk_offset += sizeof(sh); 1858ac8e9819SChris Mason 1859ac8e9819SChris Mason if (item_len) { 1860ac8e9819SChris Mason char *p = buf + *sk_offset; 1861ac8e9819SChris Mason /* copy the item */ 1862ac8e9819SChris Mason read_extent_buffer(leaf, p, 1863ac8e9819SChris Mason item_off, item_len); 1864ac8e9819SChris Mason *sk_offset += item_len; 1865ac8e9819SChris Mason } 1866e2156867SHugo Mills (*num_found)++; 1867ac8e9819SChris Mason 1868ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1869ac8e9819SChris Mason break; 1870ac8e9819SChris Mason } 1871ac8e9819SChris Mason advance_key: 1872ac8e9819SChris Mason ret = 0; 1873abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1874abc6e134SChris Mason key->offset++; 1875abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1876abc6e134SChris Mason key->offset = 0; 1877abc6e134SChris Mason key->type++; 1878abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1879abc6e134SChris Mason key->offset = 0; 1880abc6e134SChris Mason key->type = 0; 1881abc6e134SChris Mason key->objectid++; 1882abc6e134SChris Mason } else 1883abc6e134SChris Mason ret = 1; 1884ac8e9819SChris Mason overflow: 1885ac8e9819SChris Mason return ret; 1886ac8e9819SChris Mason } 1887ac8e9819SChris Mason 1888ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1889ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1890ac8e9819SChris Mason { 1891ac8e9819SChris Mason struct btrfs_root *root; 1892ac8e9819SChris Mason struct btrfs_key key; 1893ac8e9819SChris Mason struct btrfs_path *path; 1894ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1895ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1896ac8e9819SChris Mason int ret; 1897ac8e9819SChris Mason int num_found = 0; 1898ac8e9819SChris Mason unsigned long sk_offset = 0; 1899ac8e9819SChris Mason 1900ac8e9819SChris Mason path = btrfs_alloc_path(); 1901ac8e9819SChris Mason if (!path) 1902ac8e9819SChris Mason return -ENOMEM; 1903ac8e9819SChris Mason 1904ac8e9819SChris Mason if (sk->tree_id == 0) { 1905ac8e9819SChris Mason /* search the root of the inode that was passed */ 1906ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1907ac8e9819SChris Mason } else { 1908ac8e9819SChris Mason key.objectid = sk->tree_id; 1909ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1910ac8e9819SChris Mason key.offset = (u64)-1; 1911ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1912ac8e9819SChris Mason if (IS_ERR(root)) { 1913ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1914ac8e9819SChris Mason sk->tree_id); 1915ac8e9819SChris Mason btrfs_free_path(path); 1916ac8e9819SChris Mason return -ENOENT; 1917ac8e9819SChris Mason } 1918ac8e9819SChris Mason } 1919ac8e9819SChris Mason 1920ac8e9819SChris Mason key.objectid = sk->min_objectid; 1921ac8e9819SChris Mason key.type = sk->min_type; 1922ac8e9819SChris Mason key.offset = sk->min_offset; 1923ac8e9819SChris Mason 1924ac8e9819SChris Mason path->keep_locks = 1; 1925ac8e9819SChris Mason 1926ac8e9819SChris Mason while (1) { 19276174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1928ac8e9819SChris Mason if (ret != 0) { 1929ac8e9819SChris Mason if (ret > 0) 1930ac8e9819SChris Mason ret = 0; 1931ac8e9819SChris Mason goto err; 1932ac8e9819SChris Mason } 1933ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1934ac8e9819SChris Mason &sk_offset, &num_found); 1935b3b4aa74SDavid Sterba btrfs_release_path(path); 1936ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1937ac8e9819SChris Mason break; 1938ac8e9819SChris Mason 1939ac8e9819SChris Mason } 1940ac8e9819SChris Mason ret = 0; 1941ac8e9819SChris Mason err: 1942ac8e9819SChris Mason sk->nr_items = num_found; 1943ac8e9819SChris Mason btrfs_free_path(path); 1944ac8e9819SChris Mason return ret; 1945ac8e9819SChris Mason } 1946ac8e9819SChris Mason 1947ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1948ac8e9819SChris Mason void __user *argp) 1949ac8e9819SChris Mason { 1950ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1951ac8e9819SChris Mason struct inode *inode; 1952ac8e9819SChris Mason int ret; 1953ac8e9819SChris Mason 1954ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1955ac8e9819SChris Mason return -EPERM; 1956ac8e9819SChris Mason 19572354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19582354d08fSJulia Lawall if (IS_ERR(args)) 19592354d08fSJulia Lawall return PTR_ERR(args); 1960ac8e9819SChris Mason 1961496ad9aaSAl Viro inode = file_inode(file); 1962ac8e9819SChris Mason ret = search_ioctl(inode, args); 1963ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1964ac8e9819SChris Mason ret = -EFAULT; 1965ac8e9819SChris Mason kfree(args); 1966ac8e9819SChris Mason return ret; 1967ac8e9819SChris Mason } 1968ac8e9819SChris Mason 196998d377a0STARUISI Hiroaki /* 1970ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1971ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 197298d377a0STARUISI Hiroaki */ 197398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 197498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 197598d377a0STARUISI Hiroaki { 197698d377a0STARUISI Hiroaki struct btrfs_root *root; 197798d377a0STARUISI Hiroaki struct btrfs_key key; 1978ac8e9819SChris Mason char *ptr; 197998d377a0STARUISI Hiroaki int ret = -1; 198098d377a0STARUISI Hiroaki int slot; 198198d377a0STARUISI Hiroaki int len; 198298d377a0STARUISI Hiroaki int total_len = 0; 198398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 198498d377a0STARUISI Hiroaki struct extent_buffer *l; 198598d377a0STARUISI Hiroaki struct btrfs_path *path; 198698d377a0STARUISI Hiroaki 198798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 198898d377a0STARUISI Hiroaki name[0]='\0'; 198998d377a0STARUISI Hiroaki return 0; 199098d377a0STARUISI Hiroaki } 199198d377a0STARUISI Hiroaki 199298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 199398d377a0STARUISI Hiroaki if (!path) 199498d377a0STARUISI Hiroaki return -ENOMEM; 199598d377a0STARUISI Hiroaki 1996ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 199798d377a0STARUISI Hiroaki 199898d377a0STARUISI Hiroaki key.objectid = tree_id; 199998d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 200098d377a0STARUISI Hiroaki key.offset = (u64)-1; 200198d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 200298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 200398d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 20048ad6fcabSChris Mason ret = -ENOENT; 20058ad6fcabSChris Mason goto out; 200698d377a0STARUISI Hiroaki } 200798d377a0STARUISI Hiroaki 200898d377a0STARUISI Hiroaki key.objectid = dirid; 200998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20108ad6fcabSChris Mason key.offset = (u64)-1; 201198d377a0STARUISI Hiroaki 201298d377a0STARUISI Hiroaki while (1) { 201398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 201498d377a0STARUISI Hiroaki if (ret < 0) 201598d377a0STARUISI Hiroaki goto out; 201618674c6cSFilipe David Borba Manana else if (ret > 0) { 201718674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 201818674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 201918674c6cSFilipe David Borba Manana if (ret < 0) 202018674c6cSFilipe David Borba Manana goto out; 202118674c6cSFilipe David Borba Manana else if (ret > 0) { 2022ac8e9819SChris Mason ret = -ENOENT; 202398d377a0STARUISI Hiroaki goto out; 2024ac8e9819SChris Mason } 202518674c6cSFilipe David Borba Manana } 202618674c6cSFilipe David Borba Manana 202718674c6cSFilipe David Borba Manana l = path->nodes[0]; 202818674c6cSFilipe David Borba Manana slot = path->slots[0]; 202918674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 203098d377a0STARUISI Hiroaki 203198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 203298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 203398d377a0STARUISI Hiroaki ptr -= len + 1; 203498d377a0STARUISI Hiroaki total_len += len + 1; 2035a696cf35SFilipe David Borba Manana if (ptr < name) { 2036a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 203798d377a0STARUISI Hiroaki goto out; 2038a696cf35SFilipe David Borba Manana } 203998d377a0STARUISI Hiroaki 204098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 204198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 204298d377a0STARUISI Hiroaki 204398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 204498d377a0STARUISI Hiroaki break; 204598d377a0STARUISI Hiroaki 2046b3b4aa74SDavid Sterba btrfs_release_path(path); 204798d377a0STARUISI Hiroaki key.objectid = key.offset; 20488ad6fcabSChris Mason key.offset = (u64)-1; 204998d377a0STARUISI Hiroaki dirid = key.objectid; 205098d377a0STARUISI Hiroaki } 205177906a50SLi Zefan memmove(name, ptr, total_len); 205298d377a0STARUISI Hiroaki name[total_len] = '\0'; 205398d377a0STARUISI Hiroaki ret = 0; 205498d377a0STARUISI Hiroaki out: 205598d377a0STARUISI Hiroaki btrfs_free_path(path); 2056ac8e9819SChris Mason return ret; 2057ac8e9819SChris Mason } 2058ac8e9819SChris Mason 2059ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2060ac8e9819SChris Mason void __user *argp) 2061ac8e9819SChris Mason { 2062ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2063ac8e9819SChris Mason struct inode *inode; 2064ac8e9819SChris Mason int ret; 2065ac8e9819SChris Mason 2066ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2067ac8e9819SChris Mason return -EPERM; 2068ac8e9819SChris Mason 20692354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20702354d08fSJulia Lawall if (IS_ERR(args)) 20712354d08fSJulia Lawall return PTR_ERR(args); 2072c2b96929SDan Carpenter 2073496ad9aaSAl Viro inode = file_inode(file); 2074ac8e9819SChris Mason 20751b53ac4dSChris Mason if (args->treeid == 0) 20761b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20771b53ac4dSChris Mason 2078ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2079ac8e9819SChris Mason args->treeid, args->objectid, 2080ac8e9819SChris Mason args->name); 2081ac8e9819SChris Mason 2082ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2083ac8e9819SChris Mason ret = -EFAULT; 2084ac8e9819SChris Mason 2085ac8e9819SChris Mason kfree(args); 208698d377a0STARUISI Hiroaki return ret; 208798d377a0STARUISI Hiroaki } 208898d377a0STARUISI Hiroaki 208976dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 209076dda93cSYan, Zheng void __user *arg) 209176dda93cSYan, Zheng { 2092*54563d41SAl Viro struct dentry *parent = file->f_path.dentry; 209376dda93cSYan, Zheng struct dentry *dentry; 209476dda93cSYan, Zheng struct inode *dir = parent->d_inode; 209576dda93cSYan, Zheng struct inode *inode; 209676dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 209776dda93cSYan, Zheng struct btrfs_root *dest = NULL; 209876dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 209976dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2100c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2101c58aaad2SMiao Xie u64 qgroup_reserved; 210276dda93cSYan, Zheng int namelen; 210376dda93cSYan, Zheng int ret; 210476dda93cSYan, Zheng int err = 0; 210576dda93cSYan, Zheng 210676dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 210776dda93cSYan, Zheng if (IS_ERR(vol_args)) 210876dda93cSYan, Zheng return PTR_ERR(vol_args); 210976dda93cSYan, Zheng 211076dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 211176dda93cSYan, Zheng namelen = strlen(vol_args->name); 211276dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 211376dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 211476dda93cSYan, Zheng err = -EINVAL; 211576dda93cSYan, Zheng goto out; 211676dda93cSYan, Zheng } 211776dda93cSYan, Zheng 2118a561be71SAl Viro err = mnt_want_write_file(file); 211976dda93cSYan, Zheng if (err) 212076dda93cSYan, Zheng goto out; 212176dda93cSYan, Zheng 21225c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21235c50c9b8SDavid Sterba if (err == -EINTR) 21245c50c9b8SDavid Sterba goto out; 212576dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 212676dda93cSYan, Zheng if (IS_ERR(dentry)) { 212776dda93cSYan, Zheng err = PTR_ERR(dentry); 212876dda93cSYan, Zheng goto out_unlock_dir; 212976dda93cSYan, Zheng } 213076dda93cSYan, Zheng 213176dda93cSYan, Zheng if (!dentry->d_inode) { 213276dda93cSYan, Zheng err = -ENOENT; 213376dda93cSYan, Zheng goto out_dput; 213476dda93cSYan, Zheng } 213576dda93cSYan, Zheng 213676dda93cSYan, Zheng inode = dentry->d_inode; 21374260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21384260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 21394260f7c7SSage Weil /* 21404260f7c7SSage Weil * Regular user. Only allow this with a special mount 21414260f7c7SSage Weil * option, when the user has write+exec access to the 21424260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21434260f7c7SSage Weil * allowed. 21444260f7c7SSage Weil * 21454260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21464260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21474260f7c7SSage Weil * otherwise be able to delete. 21484260f7c7SSage Weil * 21494260f7c7SSage Weil * Users who want to delete empty subvols should try 21504260f7c7SSage Weil * rmdir(2). 21514260f7c7SSage Weil */ 21524260f7c7SSage Weil err = -EPERM; 21534260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21544260f7c7SSage Weil goto out_dput; 21554260f7c7SSage Weil 21564260f7c7SSage Weil /* 21574260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21584260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21594260f7c7SSage Weil * must be called on the dentry referencing the root 21604260f7c7SSage Weil * of the subvol, not a random directory contained 21614260f7c7SSage Weil * within it. 21624260f7c7SSage Weil */ 21634260f7c7SSage Weil err = -EINVAL; 21644260f7c7SSage Weil if (root == dest) 21654260f7c7SSage Weil goto out_dput; 21664260f7c7SSage Weil 21674260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21684260f7c7SSage Weil if (err) 21694260f7c7SSage Weil goto out_dput; 21705c39da5bSMiao Xie } 21714260f7c7SSage Weil 21725c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21734260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21744260f7c7SSage Weil if (err) 21754260f7c7SSage Weil goto out_dput; 21764260f7c7SSage Weil 217733345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 217876dda93cSYan, Zheng err = -EINVAL; 217976dda93cSYan, Zheng goto out_dput; 218076dda93cSYan, Zheng } 218176dda93cSYan, Zheng 218276dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 218376dda93cSYan, Zheng err = d_invalidate(dentry); 218476dda93cSYan, Zheng if (err) 218576dda93cSYan, Zheng goto out_unlock; 218676dda93cSYan, Zheng 218776dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 218876dda93cSYan, Zheng 218976dda93cSYan, Zheng err = may_destroy_subvol(dest); 219076dda93cSYan, Zheng if (err) 219176dda93cSYan, Zheng goto out_up_write; 219276dda93cSYan, Zheng 2193c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2194c58aaad2SMiao Xie /* 2195c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2196c58aaad2SMiao Xie * ref/backref. 2197c58aaad2SMiao Xie */ 2198c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2199ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2200c58aaad2SMiao Xie if (err) 2201c58aaad2SMiao Xie goto out_up_write; 2202c58aaad2SMiao Xie 2203a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2204a22285a6SYan, Zheng if (IS_ERR(trans)) { 2205a22285a6SYan, Zheng err = PTR_ERR(trans); 2206c58aaad2SMiao Xie goto out_release; 2207a22285a6SYan, Zheng } 2208c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2209c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2210a22285a6SYan, Zheng 221176dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 221276dda93cSYan, Zheng dest->root_key.objectid, 221376dda93cSYan, Zheng dentry->d_name.name, 221476dda93cSYan, Zheng dentry->d_name.len); 221579787eaaSJeff Mahoney if (ret) { 221679787eaaSJeff Mahoney err = ret; 221779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 221879787eaaSJeff Mahoney goto out_end_trans; 221979787eaaSJeff Mahoney } 222076dda93cSYan, Zheng 222176dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 222276dda93cSYan, Zheng 222376dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 222476dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 222576dda93cSYan, Zheng dest->root_item.drop_level = 0; 222676dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 222776dda93cSYan, Zheng 2228d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 222976dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 223076dda93cSYan, Zheng root->fs_info->tree_root, 223176dda93cSYan, Zheng dest->root_key.objectid); 223279787eaaSJeff Mahoney if (ret) { 223379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 223479787eaaSJeff Mahoney err = ret; 223579787eaaSJeff Mahoney goto out_end_trans; 2236d68fc57bSYan, Zheng } 223779787eaaSJeff Mahoney } 2238dd5f9615SStefan Behrens 2239dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2240dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2241dd5f9615SStefan Behrens dest->root_key.objectid); 2242dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2243dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2244dd5f9615SStefan Behrens err = ret; 2245dd5f9615SStefan Behrens goto out_end_trans; 2246dd5f9615SStefan Behrens } 2247dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2248dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2249dd5f9615SStefan Behrens dest->root_item.received_uuid, 2250dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2251dd5f9615SStefan Behrens dest->root_key.objectid); 2252dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2253dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2254dd5f9615SStefan Behrens err = ret; 2255dd5f9615SStefan Behrens goto out_end_trans; 2256dd5f9615SStefan Behrens } 2257dd5f9615SStefan Behrens } 2258dd5f9615SStefan Behrens 225979787eaaSJeff Mahoney out_end_trans: 2260c58aaad2SMiao Xie trans->block_rsv = NULL; 2261c58aaad2SMiao Xie trans->bytes_reserved = 0; 2262531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 226379787eaaSJeff Mahoney if (ret && !err) 226479787eaaSJeff Mahoney err = ret; 226576dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2266c58aaad2SMiao Xie out_release: 2267c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 226876dda93cSYan, Zheng out_up_write: 226976dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 227076dda93cSYan, Zheng out_unlock: 227176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 227276dda93cSYan, Zheng if (!err) { 2273efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 227476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 227576dda93cSYan, Zheng d_delete(dentry); 2276fa6ac876SLiu Bo 2277fa6ac876SLiu Bo /* the last ref */ 2278fa6ac876SLiu Bo if (dest->cache_inode) { 2279fa6ac876SLiu Bo iput(dest->cache_inode); 2280fa6ac876SLiu Bo dest->cache_inode = NULL; 2281fa6ac876SLiu Bo } 228276dda93cSYan, Zheng } 228376dda93cSYan, Zheng out_dput: 228476dda93cSYan, Zheng dput(dentry); 228576dda93cSYan, Zheng out_unlock_dir: 228676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 22872a79f17eSAl Viro mnt_drop_write_file(file); 228876dda93cSYan, Zheng out: 228976dda93cSYan, Zheng kfree(vol_args); 229076dda93cSYan, Zheng return err; 229176dda93cSYan, Zheng } 229276dda93cSYan, Zheng 22931e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2294f46b5a66SChristoph Hellwig { 2295496ad9aaSAl Viro struct inode *inode = file_inode(file); 2296f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22971e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2298c146afadSYan Zheng int ret; 2299c146afadSYan Zheng 230025122d15SIlya Dryomov ret = mnt_want_write_file(file); 230125122d15SIlya Dryomov if (ret) 230225122d15SIlya Dryomov return ret; 2303b83cc969SLi Zefan 230425122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 230525122d15SIlya Dryomov ret = -EROFS; 230625122d15SIlya Dryomov goto out; 23075ac00addSStefan Behrens } 2308f46b5a66SChristoph Hellwig 2309f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2310f46b5a66SChristoph Hellwig case S_IFDIR: 2311e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2312e441d54dSChris Mason ret = -EPERM; 2313e441d54dSChris Mason goto out; 2314e441d54dSChris Mason } 2315de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23168929ecfaSYan, Zheng if (ret) 23178929ecfaSYan, Zheng goto out; 2318de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2319f46b5a66SChristoph Hellwig break; 2320f46b5a66SChristoph Hellwig case S_IFREG: 2321e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2322e441d54dSChris Mason ret = -EINVAL; 2323e441d54dSChris Mason goto out; 2324e441d54dSChris Mason } 23251e701a32SChris Mason 23261e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 23271e701a32SChris Mason if (!range) { 23281e701a32SChris Mason ret = -ENOMEM; 23291e701a32SChris Mason goto out; 23301e701a32SChris Mason } 23311e701a32SChris Mason 23321e701a32SChris Mason if (argp) { 23331e701a32SChris Mason if (copy_from_user(range, argp, 23341e701a32SChris Mason sizeof(*range))) { 23351e701a32SChris Mason ret = -EFAULT; 23361e701a32SChris Mason kfree(range); 2337683be16eSDan Carpenter goto out; 23381e701a32SChris Mason } 23391e701a32SChris Mason /* compression requires us to start the IO */ 23401e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 23411e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 23421e701a32SChris Mason range->extent_thresh = (u32)-1; 23431e701a32SChris Mason } 23441e701a32SChris Mason } else { 23451e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23461e701a32SChris Mason range->len = (u64)-1; 23471e701a32SChris Mason } 2348496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23494cb5300bSChris Mason range, 0, 0); 23504cb5300bSChris Mason if (ret > 0) 23514cb5300bSChris Mason ret = 0; 23521e701a32SChris Mason kfree(range); 2353f46b5a66SChristoph Hellwig break; 23548929ecfaSYan, Zheng default: 23558929ecfaSYan, Zheng ret = -EINVAL; 2356f46b5a66SChristoph Hellwig } 2357e441d54dSChris Mason out: 235825122d15SIlya Dryomov mnt_drop_write_file(file); 2359e441d54dSChris Mason return ret; 2360f46b5a66SChristoph Hellwig } 2361f46b5a66SChristoph Hellwig 2362b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2363f46b5a66SChristoph Hellwig { 2364f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2365f46b5a66SChristoph Hellwig int ret; 2366f46b5a66SChristoph Hellwig 2367e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2368e441d54dSChris Mason return -EPERM; 2369e441d54dSChris Mason 23705ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23715ac00addSStefan Behrens 1)) { 2372e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2373c9e9f97bSIlya Dryomov } 2374c9e9f97bSIlya Dryomov 23755ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2376dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2377c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2378c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2379c9e9f97bSIlya Dryomov goto out; 2380c9e9f97bSIlya Dryomov } 2381f46b5a66SChristoph Hellwig 23825516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2383f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2384f46b5a66SChristoph Hellwig 2385f46b5a66SChristoph Hellwig kfree(vol_args); 2386c9e9f97bSIlya Dryomov out: 2387c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23885ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2389f46b5a66SChristoph Hellwig return ret; 2390f46b5a66SChristoph Hellwig } 2391f46b5a66SChristoph Hellwig 2392da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2393f46b5a66SChristoph Hellwig { 2394496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2395f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2396f46b5a66SChristoph Hellwig int ret; 2397f46b5a66SChristoph Hellwig 2398e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2399e441d54dSChris Mason return -EPERM; 2400e441d54dSChris Mason 2401da24927bSMiao Xie ret = mnt_want_write_file(file); 2402da24927bSMiao Xie if (ret) 2403da24927bSMiao Xie return ret; 2404c146afadSYan Zheng 2405dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2406c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2407c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2408c9e9f97bSIlya Dryomov goto out; 2409c9e9f97bSIlya Dryomov } 2410f46b5a66SChristoph Hellwig 24115516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2412f46b5a66SChristoph Hellwig 2413183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2414183860f6SAnand Jain 1)) { 2415183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2416183860f6SAnand Jain goto out; 2417183860f6SAnand Jain } 2418183860f6SAnand Jain 2419183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2420183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2421c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24225ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2423183860f6SAnand Jain 2424183860f6SAnand Jain out: 2425183860f6SAnand Jain kfree(vol_args); 24264ac20c70SIlya Dryomov mnt_drop_write_file(file); 2427f46b5a66SChristoph Hellwig return ret; 2428f46b5a66SChristoph Hellwig } 2429f46b5a66SChristoph Hellwig 2430475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2431475f6387SJan Schmidt { 2432027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2433475f6387SJan Schmidt struct btrfs_device *device; 2434475f6387SJan Schmidt struct btrfs_device *next; 2435475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2436027ed2f0SLi Zefan int ret = 0; 2437475f6387SJan Schmidt 2438475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2439475f6387SJan Schmidt return -EPERM; 2440475f6387SJan Schmidt 2441027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2442027ed2f0SLi Zefan if (!fi_args) 2443027ed2f0SLi Zefan return -ENOMEM; 2444027ed2f0SLi Zefan 2445f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2446027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2447027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2448475f6387SJan Schmidt 2449475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2450027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2451027ed2f0SLi Zefan fi_args->max_id = device->devid; 2452475f6387SJan Schmidt } 2453475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2454475f6387SJan Schmidt 2455027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2456027ed2f0SLi Zefan ret = -EFAULT; 2457475f6387SJan Schmidt 2458027ed2f0SLi Zefan kfree(fi_args); 2459027ed2f0SLi Zefan return ret; 2460475f6387SJan Schmidt } 2461475f6387SJan Schmidt 2462475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2463475f6387SJan Schmidt { 2464475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2465475f6387SJan Schmidt struct btrfs_device *dev; 2466475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2467475f6387SJan Schmidt int ret = 0; 2468475f6387SJan Schmidt char *s_uuid = NULL; 2469475f6387SJan Schmidt 2470475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2471475f6387SJan Schmidt return -EPERM; 2472475f6387SJan Schmidt 2473475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2474475f6387SJan Schmidt if (IS_ERR(di_args)) 2475475f6387SJan Schmidt return PTR_ERR(di_args); 2476475f6387SJan Schmidt 2477dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2478475f6387SJan Schmidt s_uuid = di_args->uuid; 2479475f6387SJan Schmidt 2480475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2481aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2482475f6387SJan Schmidt 2483475f6387SJan Schmidt if (!dev) { 2484475f6387SJan Schmidt ret = -ENODEV; 2485475f6387SJan Schmidt goto out; 2486475f6387SJan Schmidt } 2487475f6387SJan Schmidt 2488475f6387SJan Schmidt di_args->devid = dev->devid; 2489475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2490475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2491475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2492a27202fbSJim Meyering if (dev->name) { 2493606686eeSJosef Bacik struct rcu_string *name; 2494606686eeSJosef Bacik 2495606686eeSJosef Bacik rcu_read_lock(); 2496606686eeSJosef Bacik name = rcu_dereference(dev->name); 2497606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2498606686eeSJosef Bacik rcu_read_unlock(); 2499a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2500a27202fbSJim Meyering } else { 250199ba55adSStefan Behrens di_args->path[0] = '\0'; 2502a27202fbSJim Meyering } 2503475f6387SJan Schmidt 2504475f6387SJan Schmidt out: 250555793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2506475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2507475f6387SJan Schmidt ret = -EFAULT; 2508475f6387SJan Schmidt 2509475f6387SJan Schmidt kfree(di_args); 2510475f6387SJan Schmidt return ret; 2511475f6387SJan Schmidt } 2512475f6387SJan Schmidt 2513416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2514416161dbSMark Fasheh { 2515416161dbSMark Fasheh struct page *page; 2516416161dbSMark Fasheh pgoff_t index; 2517416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2518416161dbSMark Fasheh 2519416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2520416161dbSMark Fasheh 2521416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2522416161dbSMark Fasheh if (!page) 2523416161dbSMark Fasheh return NULL; 2524416161dbSMark Fasheh 2525416161dbSMark Fasheh if (!PageUptodate(page)) { 2526416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2527416161dbSMark Fasheh 0)) 2528416161dbSMark Fasheh return NULL; 2529416161dbSMark Fasheh lock_page(page); 2530416161dbSMark Fasheh if (!PageUptodate(page)) { 2531416161dbSMark Fasheh unlock_page(page); 2532416161dbSMark Fasheh page_cache_release(page); 2533416161dbSMark Fasheh return NULL; 2534416161dbSMark Fasheh } 2535416161dbSMark Fasheh } 2536416161dbSMark Fasheh unlock_page(page); 2537416161dbSMark Fasheh 2538416161dbSMark Fasheh return page; 2539416161dbSMark Fasheh } 2540416161dbSMark Fasheh 254177fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 254277fe20dcSMark Fasheh { 254377fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 254477fe20dcSMark Fasheh another, and lock file content */ 254577fe20dcSMark Fasheh while (1) { 254677fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 254777fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 254877fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 254977fe20dcSMark Fasheh off + len - 1); 255077fe20dcSMark Fasheh if (!ordered && 255177fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 255277fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 255377fe20dcSMark Fasheh break; 255477fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 255577fe20dcSMark Fasheh if (ordered) 255677fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 255777fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 255877fe20dcSMark Fasheh } 255977fe20dcSMark Fasheh } 256077fe20dcSMark Fasheh 2561416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2562416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2563416161dbSMark Fasheh { 2564416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2565416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2566416161dbSMark Fasheh 2567416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2568416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2569416161dbSMark Fasheh } 2570416161dbSMark Fasheh 2571416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2572416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2573416161dbSMark Fasheh { 2574416161dbSMark Fasheh if (inode1 < inode2) { 2575416161dbSMark Fasheh swap(inode1, inode2); 2576416161dbSMark Fasheh swap(loff1, loff2); 2577416161dbSMark Fasheh } 2578416161dbSMark Fasheh 2579416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2580416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2581416161dbSMark Fasheh if (inode1 != inode2) { 2582416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2583416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2584416161dbSMark Fasheh } 2585416161dbSMark Fasheh } 2586416161dbSMark Fasheh 2587416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2588416161dbSMark Fasheh u64 dst_loff, u64 len) 2589416161dbSMark Fasheh { 2590416161dbSMark Fasheh int ret = 0; 2591416161dbSMark Fasheh struct page *src_page, *dst_page; 2592416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2593416161dbSMark Fasheh void *addr, *dst_addr; 2594416161dbSMark Fasheh 2595416161dbSMark Fasheh while (len) { 2596416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2597416161dbSMark Fasheh cmp_len = len; 2598416161dbSMark Fasheh 2599416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2600416161dbSMark Fasheh if (!src_page) 2601416161dbSMark Fasheh return -EINVAL; 2602416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2603416161dbSMark Fasheh if (!dst_page) { 2604416161dbSMark Fasheh page_cache_release(src_page); 2605416161dbSMark Fasheh return -EINVAL; 2606416161dbSMark Fasheh } 2607416161dbSMark Fasheh addr = kmap_atomic(src_page); 2608416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2609416161dbSMark Fasheh 2610416161dbSMark Fasheh flush_dcache_page(src_page); 2611416161dbSMark Fasheh flush_dcache_page(dst_page); 2612416161dbSMark Fasheh 2613416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2614416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2615416161dbSMark Fasheh 2616416161dbSMark Fasheh kunmap_atomic(addr); 2617416161dbSMark Fasheh kunmap_atomic(dst_addr); 2618416161dbSMark Fasheh page_cache_release(src_page); 2619416161dbSMark Fasheh page_cache_release(dst_page); 2620416161dbSMark Fasheh 2621416161dbSMark Fasheh if (ret) 2622416161dbSMark Fasheh break; 2623416161dbSMark Fasheh 2624416161dbSMark Fasheh loff += cmp_len; 2625416161dbSMark Fasheh dst_loff += cmp_len; 2626416161dbSMark Fasheh len -= cmp_len; 2627416161dbSMark Fasheh } 2628416161dbSMark Fasheh 2629416161dbSMark Fasheh return ret; 2630416161dbSMark Fasheh } 2631416161dbSMark Fasheh 2632416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2633416161dbSMark Fasheh { 2634416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2635416161dbSMark Fasheh 2636416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2637416161dbSMark Fasheh return -EINVAL; 2638416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2639416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2640416161dbSMark Fasheh return -EINVAL; 2641416161dbSMark Fasheh 2642416161dbSMark Fasheh return 0; 2643416161dbSMark Fasheh } 2644416161dbSMark Fasheh 2645416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2646416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2647416161dbSMark Fasheh { 2648416161dbSMark Fasheh int ret; 2649416161dbSMark Fasheh 2650416161dbSMark Fasheh /* 2651416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2652416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2653416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2654416161dbSMark Fasheh */ 2655416161dbSMark Fasheh if (src == dst) 2656416161dbSMark Fasheh return -EINVAL; 2657416161dbSMark Fasheh 2658416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2659416161dbSMark Fasheh 2660416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2661416161dbSMark Fasheh if (ret) 2662416161dbSMark Fasheh goto out_unlock; 2663416161dbSMark Fasheh 2664416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2665416161dbSMark Fasheh if (ret) 2666416161dbSMark Fasheh goto out_unlock; 2667416161dbSMark Fasheh 2668416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2669416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2670416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2671416161dbSMark Fasheh ret = -EINVAL; 2672416161dbSMark Fasheh goto out_unlock; 2673416161dbSMark Fasheh } 2674416161dbSMark Fasheh 2675416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2676416161dbSMark Fasheh if (ret == 0) 2677416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2678416161dbSMark Fasheh 2679416161dbSMark Fasheh out_unlock: 2680416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2681416161dbSMark Fasheh 2682416161dbSMark Fasheh return ret; 2683416161dbSMark Fasheh } 2684416161dbSMark Fasheh 2685416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2686416161dbSMark Fasheh 2687416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2688416161dbSMark Fasheh void __user *argp) 2689416161dbSMark Fasheh { 2690cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2691cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2692cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2693416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2694416161dbSMark Fasheh struct file *dst_file = NULL; 2695416161dbSMark Fasheh struct inode *dst; 2696416161dbSMark Fasheh u64 off; 2697416161dbSMark Fasheh u64 len; 2698416161dbSMark Fasheh int i; 2699416161dbSMark Fasheh int ret; 2700cbf8b8caSMark Fasheh unsigned long size; 2701416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2702416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2703416161dbSMark Fasheh 2704416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2705416161dbSMark Fasheh return -EINVAL; 2706416161dbSMark Fasheh 2707416161dbSMark Fasheh ret = mnt_want_write_file(file); 2708416161dbSMark Fasheh if (ret) 2709416161dbSMark Fasheh return ret; 2710416161dbSMark Fasheh 2711cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2712416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2713cbf8b8caSMark Fasheh sizeof(tmp))) { 2714416161dbSMark Fasheh ret = -EFAULT; 2715416161dbSMark Fasheh goto out; 2716416161dbSMark Fasheh } 2717416161dbSMark Fasheh 2718cbf8b8caSMark Fasheh size = sizeof(tmp) + 2719cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2720cbf8b8caSMark Fasheh 2721229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2722cbf8b8caSMark Fasheh 2723229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2724229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2725cbf8b8caSMark Fasheh goto out; 2726cbf8b8caSMark Fasheh } 2727cbf8b8caSMark Fasheh 2728cbf8b8caSMark Fasheh off = same->logical_offset; 2729cbf8b8caSMark Fasheh len = same->length; 2730416161dbSMark Fasheh 2731416161dbSMark Fasheh /* 2732416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2733416161dbSMark Fasheh * This is intended to bound the total time spent in this 2734416161dbSMark Fasheh * ioctl to something sane. 2735416161dbSMark Fasheh */ 2736416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2737416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2738416161dbSMark Fasheh 2739416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2740416161dbSMark Fasheh /* 2741416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2742416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2743416161dbSMark Fasheh * this situation without an update. 2744416161dbSMark Fasheh */ 2745416161dbSMark Fasheh ret = -EINVAL; 2746416161dbSMark Fasheh goto out; 2747416161dbSMark Fasheh } 2748416161dbSMark Fasheh 2749416161dbSMark Fasheh ret = -EISDIR; 2750416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2751416161dbSMark Fasheh goto out; 2752416161dbSMark Fasheh 2753416161dbSMark Fasheh ret = -EACCES; 2754416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2755416161dbSMark Fasheh goto out; 2756416161dbSMark Fasheh 2757cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2758cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2759cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2760cbf8b8caSMark Fasheh same->info[i].status = 0; 2761416161dbSMark Fasheh } 2762416161dbSMark Fasheh 2763cbf8b8caSMark Fasheh ret = 0; 2764cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2765cbf8b8caSMark Fasheh info = &same->info[i]; 2766416161dbSMark Fasheh 2767cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2768416161dbSMark Fasheh if (!dst_file) { 2769cbf8b8caSMark Fasheh info->status = -EBADF; 2770416161dbSMark Fasheh goto next; 2771416161dbSMark Fasheh } 2772416161dbSMark Fasheh 2773416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2774cbf8b8caSMark Fasheh info->status = -EINVAL; 2775416161dbSMark Fasheh goto next; 2776416161dbSMark Fasheh } 2777416161dbSMark Fasheh 2778cbf8b8caSMark Fasheh info->status = -EXDEV; 2779416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2780416161dbSMark Fasheh goto next; 2781416161dbSMark Fasheh 2782416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2783416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2784416161dbSMark Fasheh goto next; 2785416161dbSMark Fasheh 2786416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2787cbf8b8caSMark Fasheh info->status = -EISDIR; 2788416161dbSMark Fasheh goto next; 2789416161dbSMark Fasheh } 2790416161dbSMark Fasheh 2791416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2792cbf8b8caSMark Fasheh info->status = -EACCES; 2793416161dbSMark Fasheh goto next; 2794416161dbSMark Fasheh } 2795416161dbSMark Fasheh 2796cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2797cbf8b8caSMark Fasheh info->logical_offset); 2798cbf8b8caSMark Fasheh if (info->status == 0) 2799cbf8b8caSMark Fasheh info->bytes_deduped += len; 2800416161dbSMark Fasheh 2801416161dbSMark Fasheh next: 2802416161dbSMark Fasheh if (dst_file) 2803416161dbSMark Fasheh fput(dst_file); 2804cbf8b8caSMark Fasheh } 2805416161dbSMark Fasheh 2806cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2807cbf8b8caSMark Fasheh if (ret) 2808416161dbSMark Fasheh ret = -EFAULT; 2809416161dbSMark Fasheh 2810416161dbSMark Fasheh out: 2811416161dbSMark Fasheh mnt_drop_write_file(file); 2812416161dbSMark Fasheh return ret; 2813416161dbSMark Fasheh } 2814416161dbSMark Fasheh 281532b7c687SMark Fasheh /** 281632b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 281732b7c687SMark Fasheh * 281832b7c687SMark Fasheh * @src: Inode to clone from 281932b7c687SMark Fasheh * @inode: Inode to clone to 282032b7c687SMark Fasheh * @off: Offset within source to start clone from 282132b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 282232b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 282332b7c687SMark Fasheh * identical values here 282432b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 282532b7c687SMark Fasheh */ 282632b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 282732b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2828f46b5a66SChristoph Hellwig { 2829f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 283032b7c687SMark Fasheh struct btrfs_path *path = NULL; 2831f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 283232b7c687SMark Fasheh struct btrfs_trans_handle *trans; 283332b7c687SMark Fasheh char *buf = NULL; 2834ae01a0abSYan Zheng struct btrfs_key key; 2835f46b5a66SChristoph Hellwig u32 nritems; 2836f46b5a66SChristoph Hellwig int slot; 2837ae01a0abSYan Zheng int ret; 283832b7c687SMark Fasheh u64 len = olen_aligned; 2839ae01a0abSYan Zheng 2840ae01a0abSYan Zheng ret = -ENOMEM; 2841ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2842ae01a0abSYan Zheng if (!buf) 284332b7c687SMark Fasheh return ret; 2844ae01a0abSYan Zheng 2845ae01a0abSYan Zheng path = btrfs_alloc_path(); 2846ae01a0abSYan Zheng if (!path) { 2847ae01a0abSYan Zheng vfree(buf); 284832b7c687SMark Fasheh return ret; 2849ae01a0abSYan Zheng } 285032b7c687SMark Fasheh 2851ae01a0abSYan Zheng path->reada = 2; 2852c5c9cd4dSSage Weil /* clone data */ 285333345d01SLi Zefan key.objectid = btrfs_ino(src); 2854ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2855ae01a0abSYan Zheng key.offset = 0; 2856f46b5a66SChristoph Hellwig 2857f46b5a66SChristoph Hellwig while (1) { 2858f46b5a66SChristoph Hellwig /* 2859f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2860f46b5a66SChristoph Hellwig * tree. 2861f46b5a66SChristoph Hellwig */ 2862362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2863362a20c5SDavid Sterba 0, 0); 2864f46b5a66SChristoph Hellwig if (ret < 0) 2865f46b5a66SChristoph Hellwig goto out; 2866f46b5a66SChristoph Hellwig 2867ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2868ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2869362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2870f46b5a66SChristoph Hellwig if (ret < 0) 2871f46b5a66SChristoph Hellwig goto out; 2872f46b5a66SChristoph Hellwig if (ret > 0) 2873f46b5a66SChristoph Hellwig break; 2874ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2875f46b5a66SChristoph Hellwig } 2876f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2877f46b5a66SChristoph Hellwig slot = path->slots[0]; 2878f46b5a66SChristoph Hellwig 2879ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2880d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 288133345d01SLi Zefan key.objectid != btrfs_ino(src)) 2882f46b5a66SChristoph Hellwig break; 2883f46b5a66SChristoph Hellwig 2884c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2885c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2886c5c9cd4dSSage Weil int type; 288731840ae1SZheng Yan u32 size; 288831840ae1SZheng Yan struct btrfs_key new_key; 2889c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2890c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2891c5c9cd4dSSage Weil u8 comp; 2892b5384d48SSage Weil u64 endoff; 289331840ae1SZheng Yan 289431840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 289531840ae1SZheng Yan read_extent_buffer(leaf, buf, 289631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 289731840ae1SZheng Yan size); 2898c5c9cd4dSSage Weil 2899c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2900c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2901c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2902c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2903c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2904c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2905d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2906d397712bSChris Mason extent); 2907d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2908d397712bSChris Mason extent); 2909c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2910d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2911d397712bSChris Mason extent); 2912c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2913c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2914c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2915c5c9cd4dSSage Weil extent); 2916c5c9cd4dSSage Weil } 2917b3b4aa74SDavid Sterba btrfs_release_path(path); 291831840ae1SZheng Yan 2919050006a7SSage Weil if (key.offset + datal <= off || 2920aa42ffd9SLiu Bo key.offset >= off + len - 1) 2921c5c9cd4dSSage Weil goto next; 2922c5c9cd4dSSage Weil 292331840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 292433345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 29254d728ec7SLi Zefan if (off <= key.offset) 2926c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 29274d728ec7SLi Zefan else 29284d728ec7SLi Zefan new_key.offset = destoff; 2929c5c9cd4dSSage Weil 2930b6f3409bSSage Weil /* 2931b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2932b6f3409bSSage Weil * 1 - add new extent 2933b6f3409bSSage Weil * 1 - inode update 2934b6f3409bSSage Weil */ 2935b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2936a22285a6SYan, Zheng if (IS_ERR(trans)) { 2937a22285a6SYan, Zheng ret = PTR_ERR(trans); 2938a22285a6SYan, Zheng goto out; 2939a22285a6SYan, Zheng } 2940a22285a6SYan, Zheng 2941c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2942c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2943d72c0842SLi Zefan /* 2944d72c0842SLi Zefan * a | --- range to clone ---| b 2945d72c0842SLi Zefan * | ------------- extent ------------- | 2946d72c0842SLi Zefan */ 2947d72c0842SLi Zefan 2948d72c0842SLi Zefan /* substract range b */ 2949d72c0842SLi Zefan if (key.offset + datal > off + len) 2950d72c0842SLi Zefan datal = off + len - key.offset; 2951d72c0842SLi Zefan 2952d72c0842SLi Zefan /* substract range a */ 2953a22285a6SYan, Zheng if (off > key.offset) { 2954a22285a6SYan, Zheng datao += off - key.offset; 2955a22285a6SYan, Zheng datal -= off - key.offset; 2956a22285a6SYan, Zheng } 2957a22285a6SYan, Zheng 29585dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2959a22285a6SYan, Zheng new_key.offset, 2960a22285a6SYan, Zheng new_key.offset + datal, 29612671485dSJosef Bacik 1); 296279787eaaSJeff Mahoney if (ret) { 296379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 296479787eaaSJeff Mahoney ret); 296579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 296679787eaaSJeff Mahoney goto out; 296779787eaaSJeff Mahoney } 2968a22285a6SYan, Zheng 296931840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 297031840ae1SZheng Yan &new_key, size); 297179787eaaSJeff Mahoney if (ret) { 297279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 297379787eaaSJeff Mahoney ret); 297479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 297579787eaaSJeff Mahoney goto out; 297679787eaaSJeff Mahoney } 297731840ae1SZheng Yan 297831840ae1SZheng Yan leaf = path->nodes[0]; 297931840ae1SZheng Yan slot = path->slots[0]; 298031840ae1SZheng Yan write_extent_buffer(leaf, buf, 298131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 298231840ae1SZheng Yan size); 2983ae01a0abSYan Zheng 2984f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2985f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2986c5c9cd4dSSage Weil 2987c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2988c5c9cd4dSSage Weil if (!disko) 2989c5c9cd4dSSage Weil datao = 0; 2990c5c9cd4dSSage Weil 2991c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2992c5c9cd4dSSage Weil datao); 2993c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2994c5c9cd4dSSage Weil datal); 2995c5c9cd4dSSage Weil if (disko) { 2996c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2997ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 29985d4f98a2SYan Zheng disko, diskl, 0, 2999f46b5a66SChristoph Hellwig root->root_key.objectid, 300033345d01SLi Zefan btrfs_ino(inode), 300166d7e7f0SArne Jansen new_key.offset - datao, 300266d7e7f0SArne Jansen 0); 300379787eaaSJeff Mahoney if (ret) { 300479787eaaSJeff Mahoney btrfs_abort_transaction(trans, 300579787eaaSJeff Mahoney root, 300679787eaaSJeff Mahoney ret); 300779787eaaSJeff Mahoney btrfs_end_transaction(trans, 300879787eaaSJeff Mahoney root); 300979787eaaSJeff Mahoney goto out; 301079787eaaSJeff Mahoney 301179787eaaSJeff Mahoney } 3012f46b5a66SChristoph Hellwig } 3013c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3014c5c9cd4dSSage Weil u64 skip = 0; 3015c5c9cd4dSSage Weil u64 trim = 0; 3016c5c9cd4dSSage Weil if (off > key.offset) { 3017c5c9cd4dSSage Weil skip = off - key.offset; 3018c5c9cd4dSSage Weil new_key.offset += skip; 301931840ae1SZheng Yan } 3020d397712bSChris Mason 3021c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3022c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3023d397712bSChris Mason 3024c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3025c5c9cd4dSSage Weil ret = -EINVAL; 3026a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3027c5c9cd4dSSage Weil goto out; 302831840ae1SZheng Yan } 3029c5c9cd4dSSage Weil size -= skip + trim; 3030c5c9cd4dSSage Weil datal -= skip + trim; 3031a22285a6SYan, Zheng 30325dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3033a22285a6SYan, Zheng new_key.offset, 3034a22285a6SYan, Zheng new_key.offset + datal, 30352671485dSJosef Bacik 1); 303679787eaaSJeff Mahoney if (ret) { 303779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 303879787eaaSJeff Mahoney ret); 303979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304079787eaaSJeff Mahoney goto out; 304179787eaaSJeff Mahoney } 3042a22285a6SYan, Zheng 3043c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3044c5c9cd4dSSage Weil &new_key, size); 304579787eaaSJeff Mahoney if (ret) { 304679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304779787eaaSJeff Mahoney ret); 304879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304979787eaaSJeff Mahoney goto out; 305079787eaaSJeff Mahoney } 3051c5c9cd4dSSage Weil 3052c5c9cd4dSSage Weil if (skip) { 3053d397712bSChris Mason u32 start = 3054d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3055c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3056c5c9cd4dSSage Weil datal); 3057c5c9cd4dSSage Weil } 3058c5c9cd4dSSage Weil 3059c5c9cd4dSSage Weil leaf = path->nodes[0]; 3060c5c9cd4dSSage Weil slot = path->slots[0]; 3061c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3062c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3063c5c9cd4dSSage Weil size); 3064c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3065c5c9cd4dSSage Weil } 3066c5c9cd4dSSage Weil 3067c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3068b3b4aa74SDavid Sterba btrfs_release_path(path); 3069c5c9cd4dSSage Weil 30700c4d2d95SJosef Bacik inode_inc_iversion(inode); 3071a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3072b5384d48SSage Weil 3073b5384d48SSage Weil /* 3074b5384d48SSage Weil * we round up to the block size at eof when 3075b5384d48SSage Weil * determining which extents to clone above, 3076b5384d48SSage Weil * but shouldn't round up the file size 3077b5384d48SSage Weil */ 3078b5384d48SSage Weil endoff = new_key.offset + datal; 30795f3888ffSLi Zefan if (endoff > destoff+olen) 30805f3888ffSLi Zefan endoff = destoff+olen; 3081b5384d48SSage Weil if (endoff > inode->i_size) 3082b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3083b5384d48SSage Weil 3084a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 308579787eaaSJeff Mahoney if (ret) { 308679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3087a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 308879787eaaSJeff Mahoney goto out; 308979787eaaSJeff Mahoney } 309079787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3091a22285a6SYan, Zheng } 3092c5c9cd4dSSage Weil next: 3093b3b4aa74SDavid Sterba btrfs_release_path(path); 3094ae01a0abSYan Zheng key.offset++; 3095ae01a0abSYan Zheng } 3096f46b5a66SChristoph Hellwig ret = 0; 309732b7c687SMark Fasheh 3098f46b5a66SChristoph Hellwig out: 3099b3b4aa74SDavid Sterba btrfs_release_path(path); 310032b7c687SMark Fasheh btrfs_free_path(path); 310132b7c687SMark Fasheh vfree(buf); 310232b7c687SMark Fasheh return ret; 310332b7c687SMark Fasheh } 310432b7c687SMark Fasheh 310532b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 310632b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 310732b7c687SMark Fasheh { 3108*54563d41SAl Viro struct inode *inode = file_inode(file); 310932b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 311032b7c687SMark Fasheh struct fd src_file; 311132b7c687SMark Fasheh struct inode *src; 311232b7c687SMark Fasheh int ret; 311332b7c687SMark Fasheh u64 len = olen; 311432b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 311532b7c687SMark Fasheh int same_inode = 0; 311632b7c687SMark Fasheh 311732b7c687SMark Fasheh /* 311832b7c687SMark Fasheh * TODO: 311932b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 312032b7c687SMark Fasheh * decompress into destination's address_space (the file offset 312132b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 312232b7c687SMark Fasheh * otherwise reinsert) a subrange. 312332b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 312432b7c687SMark Fasheh * they don't overlap)? 312532b7c687SMark Fasheh */ 312632b7c687SMark Fasheh 312732b7c687SMark Fasheh /* the destination must be opened for writing */ 312832b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 312932b7c687SMark Fasheh return -EINVAL; 313032b7c687SMark Fasheh 313132b7c687SMark Fasheh if (btrfs_root_readonly(root)) 313232b7c687SMark Fasheh return -EROFS; 313332b7c687SMark Fasheh 313432b7c687SMark Fasheh ret = mnt_want_write_file(file); 313532b7c687SMark Fasheh if (ret) 313632b7c687SMark Fasheh return ret; 313732b7c687SMark Fasheh 313832b7c687SMark Fasheh src_file = fdget(srcfd); 313932b7c687SMark Fasheh if (!src_file.file) { 314032b7c687SMark Fasheh ret = -EBADF; 314132b7c687SMark Fasheh goto out_drop_write; 314232b7c687SMark Fasheh } 314332b7c687SMark Fasheh 314432b7c687SMark Fasheh ret = -EXDEV; 314532b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 314632b7c687SMark Fasheh goto out_fput; 314732b7c687SMark Fasheh 314832b7c687SMark Fasheh src = file_inode(src_file.file); 314932b7c687SMark Fasheh 315032b7c687SMark Fasheh ret = -EINVAL; 315132b7c687SMark Fasheh if (src == inode) 315232b7c687SMark Fasheh same_inode = 1; 315332b7c687SMark Fasheh 315432b7c687SMark Fasheh /* the src must be open for reading */ 315532b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 315632b7c687SMark Fasheh goto out_fput; 315732b7c687SMark Fasheh 315832b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 315932b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 316032b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 316132b7c687SMark Fasheh goto out_fput; 316232b7c687SMark Fasheh 316332b7c687SMark Fasheh ret = -EISDIR; 316432b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 316532b7c687SMark Fasheh goto out_fput; 316632b7c687SMark Fasheh 316732b7c687SMark Fasheh ret = -EXDEV; 316832b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 316932b7c687SMark Fasheh goto out_fput; 317032b7c687SMark Fasheh 317132b7c687SMark Fasheh if (!same_inode) { 317232b7c687SMark Fasheh if (inode < src) { 317332b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 317432b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 317532b7c687SMark Fasheh } else { 317632b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 317732b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 317832b7c687SMark Fasheh } 317932b7c687SMark Fasheh } else { 318032b7c687SMark Fasheh mutex_lock(&src->i_mutex); 318132b7c687SMark Fasheh } 318232b7c687SMark Fasheh 318332b7c687SMark Fasheh /* determine range to clone */ 318432b7c687SMark Fasheh ret = -EINVAL; 318532b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 318632b7c687SMark Fasheh goto out_unlock; 318732b7c687SMark Fasheh if (len == 0) 318832b7c687SMark Fasheh olen = len = src->i_size - off; 318932b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 319032b7c687SMark Fasheh if (off + len == src->i_size) 319132b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 319232b7c687SMark Fasheh 319332b7c687SMark Fasheh /* verify the end result is block aligned */ 319432b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 319532b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 319632b7c687SMark Fasheh goto out_unlock; 319732b7c687SMark Fasheh 319832b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 319932b7c687SMark Fasheh if (same_inode) { 320032b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 320132b7c687SMark Fasheh goto out_unlock; 320232b7c687SMark Fasheh } 320332b7c687SMark Fasheh 320432b7c687SMark Fasheh if (destoff > inode->i_size) { 320532b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 320632b7c687SMark Fasheh if (ret) 320732b7c687SMark Fasheh goto out_unlock; 320832b7c687SMark Fasheh } 320932b7c687SMark Fasheh 321032b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 321132b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 321232b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 321332b7c687SMark Fasheh 321432b7c687SMark Fasheh lock_extent_range(src, off, len); 321532b7c687SMark Fasheh 321632b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 321732b7c687SMark Fasheh 3218aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3219f46b5a66SChristoph Hellwig out_unlock: 3220f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3221a96fbc72SLiu Bo if (!same_inode) 3222f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3223f46b5a66SChristoph Hellwig out_fput: 32242903ff01SAl Viro fdput(src_file); 3225ab67b7c1SYan Zheng out_drop_write: 32262a79f17eSAl Viro mnt_drop_write_file(file); 3227f46b5a66SChristoph Hellwig return ret; 3228f46b5a66SChristoph Hellwig } 3229f46b5a66SChristoph Hellwig 32307a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3231c5c9cd4dSSage Weil { 3232c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3233c5c9cd4dSSage Weil 32347a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3235c5c9cd4dSSage Weil return -EFAULT; 3236c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3237c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3238c5c9cd4dSSage Weil } 3239c5c9cd4dSSage Weil 3240f46b5a66SChristoph Hellwig /* 3241f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3242f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3243f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3244f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3245f46b5a66SChristoph Hellwig */ 3246b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3247f46b5a66SChristoph Hellwig { 3248496ad9aaSAl Viro struct inode *inode = file_inode(file); 3249f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3250f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 32511ab86aedSSage Weil int ret; 3252f46b5a66SChristoph Hellwig 32531ab86aedSSage Weil ret = -EPERM; 3254df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3255f46b5a66SChristoph Hellwig goto out; 32561ab86aedSSage Weil 32571ab86aedSSage Weil ret = -EINPROGRESS; 32581ab86aedSSage Weil if (file->private_data) 32591ab86aedSSage Weil goto out; 32609ca9ee09SSage Weil 3261b83cc969SLi Zefan ret = -EROFS; 3262b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3263b83cc969SLi Zefan goto out; 3264b83cc969SLi Zefan 3265a561be71SAl Viro ret = mnt_want_write_file(file); 3266c146afadSYan Zheng if (ret) 3267c146afadSYan Zheng goto out; 3268c146afadSYan Zheng 3269a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 32709ca9ee09SSage Weil 3271f46b5a66SChristoph Hellwig ret = -ENOMEM; 32727a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3273abd30bb0STsutomu Itoh if (IS_ERR(trans)) 32741ab86aedSSage Weil goto out_drop; 32751ab86aedSSage Weil 32761ab86aedSSage Weil file->private_data = trans; 32771ab86aedSSage Weil return 0; 32781ab86aedSSage Weil 32791ab86aedSSage Weil out_drop: 3280a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 32812a79f17eSAl Viro mnt_drop_write_file(file); 3282f46b5a66SChristoph Hellwig out: 3283f46b5a66SChristoph Hellwig return ret; 3284f46b5a66SChristoph Hellwig } 3285f46b5a66SChristoph Hellwig 32866ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32876ef5ed0dSJosef Bacik { 3288496ad9aaSAl Viro struct inode *inode = file_inode(file); 32896ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32906ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32916ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32926ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32936ef5ed0dSJosef Bacik struct btrfs_path *path; 32946ef5ed0dSJosef Bacik struct btrfs_key location; 32956ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 32966ef5ed0dSJosef Bacik u64 objectid = 0; 32976ef5ed0dSJosef Bacik u64 dir_id; 32983c04ce01SMiao Xie int ret; 32996ef5ed0dSJosef Bacik 33006ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33016ef5ed0dSJosef Bacik return -EPERM; 33026ef5ed0dSJosef Bacik 33033c04ce01SMiao Xie ret = mnt_want_write_file(file); 33043c04ce01SMiao Xie if (ret) 33053c04ce01SMiao Xie return ret; 33063c04ce01SMiao Xie 33073c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33083c04ce01SMiao Xie ret = -EFAULT; 33093c04ce01SMiao Xie goto out; 33103c04ce01SMiao Xie } 33116ef5ed0dSJosef Bacik 33126ef5ed0dSJosef Bacik if (!objectid) 33131cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33146ef5ed0dSJosef Bacik 33156ef5ed0dSJosef Bacik location.objectid = objectid; 33166ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33176ef5ed0dSJosef Bacik location.offset = (u64)-1; 33186ef5ed0dSJosef Bacik 33196ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 33203c04ce01SMiao Xie if (IS_ERR(new_root)) { 33213c04ce01SMiao Xie ret = PTR_ERR(new_root); 33223c04ce01SMiao Xie goto out; 33233c04ce01SMiao Xie } 33246ef5ed0dSJosef Bacik 33256ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33263c04ce01SMiao Xie if (!path) { 33273c04ce01SMiao Xie ret = -ENOMEM; 33283c04ce01SMiao Xie goto out; 33293c04ce01SMiao Xie } 33306ef5ed0dSJosef Bacik path->leave_spinning = 1; 33316ef5ed0dSJosef Bacik 33326ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 333398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33346ef5ed0dSJosef Bacik btrfs_free_path(path); 33353c04ce01SMiao Xie ret = PTR_ERR(trans); 33363c04ce01SMiao Xie goto out; 33376ef5ed0dSJosef Bacik } 33386ef5ed0dSJosef Bacik 33396c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 33406ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 33416ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3342cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33436ef5ed0dSJosef Bacik btrfs_free_path(path); 33446ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33456ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 33466ef5ed0dSJosef Bacik "this isn't going to work\n"); 33473c04ce01SMiao Xie ret = -ENOENT; 33483c04ce01SMiao Xie goto out; 33496ef5ed0dSJosef Bacik } 33506ef5ed0dSJosef Bacik 33516ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33526ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33536ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33546ef5ed0dSJosef Bacik btrfs_free_path(path); 33556ef5ed0dSJosef Bacik 33562b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 33576ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33583c04ce01SMiao Xie out: 33593c04ce01SMiao Xie mnt_drop_write_file(file); 33603c04ce01SMiao Xie return ret; 33616ef5ed0dSJosef Bacik } 33626ef5ed0dSJosef Bacik 33635af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3364bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3365bf5fc093SJosef Bacik { 3366bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3367bf5fc093SJosef Bacik 3368bf5fc093SJosef Bacik space->total_bytes = 0; 3369bf5fc093SJosef Bacik space->used_bytes = 0; 3370bf5fc093SJosef Bacik space->flags = 0; 3371bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3372bf5fc093SJosef Bacik space->flags = block_group->flags; 3373bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3374bf5fc093SJosef Bacik space->used_bytes += 3375bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3376bf5fc093SJosef Bacik } 3377bf5fc093SJosef Bacik } 3378bf5fc093SJosef Bacik 337948a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 33801406e432SJosef Bacik { 33811406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33821406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33831406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33847fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 338513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33861406e432SJosef Bacik struct btrfs_space_info *info; 3387bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3388bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3389bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3390bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3391bf5fc093SJosef Bacik int num_types = 4; 33927fde62bfSChris Mason int alloc_size; 33931406e432SJosef Bacik int ret = 0; 339451788b1bSDan Rosenberg u64 slot_count = 0; 3395bf5fc093SJosef Bacik int i, c; 33961406e432SJosef Bacik 33971406e432SJosef Bacik if (copy_from_user(&space_args, 33981406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 33991406e432SJosef Bacik sizeof(space_args))) 34001406e432SJosef Bacik return -EFAULT; 34011406e432SJosef Bacik 3402bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3403bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3404bf5fc093SJosef Bacik 3405bf5fc093SJosef Bacik info = NULL; 34067fde62bfSChris Mason rcu_read_lock(); 3407bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3408bf5fc093SJosef Bacik list) { 3409bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3410bf5fc093SJosef Bacik info = tmp; 3411bf5fc093SJosef Bacik break; 3412bf5fc093SJosef Bacik } 3413bf5fc093SJosef Bacik } 34147fde62bfSChris Mason rcu_read_unlock(); 34151406e432SJosef Bacik 3416bf5fc093SJosef Bacik if (!info) 3417bf5fc093SJosef Bacik continue; 3418bf5fc093SJosef Bacik 3419bf5fc093SJosef Bacik down_read(&info->groups_sem); 3420bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3421bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3422bf5fc093SJosef Bacik slot_count++; 3423bf5fc093SJosef Bacik } 3424bf5fc093SJosef Bacik up_read(&info->groups_sem); 3425bf5fc093SJosef Bacik } 3426bf5fc093SJosef Bacik 34277fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34287fde62bfSChris Mason if (space_args.space_slots == 0) { 34297fde62bfSChris Mason space_args.total_spaces = slot_count; 34307fde62bfSChris Mason goto out; 34317fde62bfSChris Mason } 3432bf5fc093SJosef Bacik 343351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3434bf5fc093SJosef Bacik 34357fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3436bf5fc093SJosef Bacik 34377fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34387fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34397fde62bfSChris Mason */ 34407fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 34417fde62bfSChris Mason return -ENOMEM; 34427fde62bfSChris Mason 34437fde62bfSChris Mason space_args.total_spaces = 0; 34447fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 34457fde62bfSChris Mason if (!dest) 34467fde62bfSChris Mason return -ENOMEM; 34477fde62bfSChris Mason dest_orig = dest; 34487fde62bfSChris Mason 34497fde62bfSChris Mason /* now we have a buffer to copy into */ 3450bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3451bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3452bf5fc093SJosef Bacik 345351788b1bSDan Rosenberg if (!slot_count) 345451788b1bSDan Rosenberg break; 345551788b1bSDan Rosenberg 3456bf5fc093SJosef Bacik info = NULL; 34571406e432SJosef Bacik rcu_read_lock(); 3458bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3459bf5fc093SJosef Bacik list) { 3460bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3461bf5fc093SJosef Bacik info = tmp; 34627fde62bfSChris Mason break; 3463bf5fc093SJosef Bacik } 3464bf5fc093SJosef Bacik } 3465bf5fc093SJosef Bacik rcu_read_unlock(); 34667fde62bfSChris Mason 3467bf5fc093SJosef Bacik if (!info) 3468bf5fc093SJosef Bacik continue; 3469bf5fc093SJosef Bacik down_read(&info->groups_sem); 3470bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3471bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 34725af3e8ccSStefan Behrens btrfs_get_block_group_info( 34735af3e8ccSStefan Behrens &info->block_groups[c], &space); 34747fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34751406e432SJosef Bacik dest++; 34761406e432SJosef Bacik space_args.total_spaces++; 347751788b1bSDan Rosenberg slot_count--; 34781406e432SJosef Bacik } 347951788b1bSDan Rosenberg if (!slot_count) 348051788b1bSDan Rosenberg break; 3481bf5fc093SJosef Bacik } 3482bf5fc093SJosef Bacik up_read(&info->groups_sem); 3483bf5fc093SJosef Bacik } 34841406e432SJosef Bacik 34852eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 34867fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 34877fde62bfSChris Mason 34887fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 34897fde62bfSChris Mason ret = -EFAULT; 34907fde62bfSChris Mason 34917fde62bfSChris Mason kfree(dest_orig); 34927fde62bfSChris Mason out: 34937fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 34941406e432SJosef Bacik ret = -EFAULT; 34951406e432SJosef Bacik 34961406e432SJosef Bacik return ret; 34971406e432SJosef Bacik } 34981406e432SJosef Bacik 3499f46b5a66SChristoph Hellwig /* 3500f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3501f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3502f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3503f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3504f46b5a66SChristoph Hellwig */ 3505f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3506f46b5a66SChristoph Hellwig { 3507496ad9aaSAl Viro struct inode *inode = file_inode(file); 3508f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3509f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3510f46b5a66SChristoph Hellwig 3511f46b5a66SChristoph Hellwig trans = file->private_data; 35121ab86aedSSage Weil if (!trans) 35131ab86aedSSage Weil return -EINVAL; 3514b214107eSChristoph Hellwig file->private_data = NULL; 35159ca9ee09SSage Weil 35161ab86aedSSage Weil btrfs_end_transaction(trans, root); 35171ab86aedSSage Weil 3518a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 35199ca9ee09SSage Weil 35202a79f17eSAl Viro mnt_drop_write_file(file); 35211ab86aedSSage Weil return 0; 3522f46b5a66SChristoph Hellwig } 3523f46b5a66SChristoph Hellwig 35249a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35259a8c28beSMiao Xie void __user *argp) 352646204592SSage Weil { 352746204592SSage Weil struct btrfs_trans_handle *trans; 352846204592SSage Weil u64 transid; 3529db5b493aSTsutomu Itoh int ret; 353046204592SSage Weil 3531d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3532ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3533ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 353498d5dc13STsutomu Itoh return PTR_ERR(trans); 3535ff7c1d33SMiao Xie 3536ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3537ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3538ff7c1d33SMiao Xie goto out; 3539ff7c1d33SMiao Xie } 354046204592SSage Weil transid = trans->transid; 3541db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 35428b2b2d3cSTsutomu Itoh if (ret) { 35438b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3544db5b493aSTsutomu Itoh return ret; 35458b2b2d3cSTsutomu Itoh } 3546ff7c1d33SMiao Xie out: 354746204592SSage Weil if (argp) 354846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 354946204592SSage Weil return -EFAULT; 355046204592SSage Weil return 0; 355146204592SSage Weil } 355246204592SSage Weil 35539a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 35549a8c28beSMiao Xie void __user *argp) 355546204592SSage Weil { 355646204592SSage Weil u64 transid; 355746204592SSage Weil 355846204592SSage Weil if (argp) { 355946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 356046204592SSage Weil return -EFAULT; 356146204592SSage Weil } else { 356246204592SSage Weil transid = 0; /* current trans */ 356346204592SSage Weil } 356446204592SSage Weil return btrfs_wait_for_commit(root, transid); 356546204592SSage Weil } 356646204592SSage Weil 3567b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3568475f6387SJan Schmidt { 3569496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3570475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3571b8e95489SMiao Xie int ret; 3572475f6387SJan Schmidt 3573475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3574475f6387SJan Schmidt return -EPERM; 3575475f6387SJan Schmidt 3576475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3577475f6387SJan Schmidt if (IS_ERR(sa)) 3578475f6387SJan Schmidt return PTR_ERR(sa); 3579475f6387SJan Schmidt 3580b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3581b8e95489SMiao Xie ret = mnt_want_write_file(file); 3582b8e95489SMiao Xie if (ret) 3583b8e95489SMiao Xie goto out; 3584b8e95489SMiao Xie } 3585b8e95489SMiao Xie 3586aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 358763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 358863a212abSStefan Behrens 0); 3589475f6387SJan Schmidt 3590475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3591475f6387SJan Schmidt ret = -EFAULT; 3592475f6387SJan Schmidt 3593b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3594b8e95489SMiao Xie mnt_drop_write_file(file); 3595b8e95489SMiao Xie out: 3596475f6387SJan Schmidt kfree(sa); 3597475f6387SJan Schmidt return ret; 3598475f6387SJan Schmidt } 3599475f6387SJan Schmidt 3600475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3601475f6387SJan Schmidt { 3602475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3603475f6387SJan Schmidt return -EPERM; 3604475f6387SJan Schmidt 3605aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3606475f6387SJan Schmidt } 3607475f6387SJan Schmidt 3608475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3609475f6387SJan Schmidt void __user *arg) 3610475f6387SJan Schmidt { 3611475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3612475f6387SJan Schmidt int ret; 3613475f6387SJan Schmidt 3614475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3615475f6387SJan Schmidt return -EPERM; 3616475f6387SJan Schmidt 3617475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3618475f6387SJan Schmidt if (IS_ERR(sa)) 3619475f6387SJan Schmidt return PTR_ERR(sa); 3620475f6387SJan Schmidt 3621475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3622475f6387SJan Schmidt 3623475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3624475f6387SJan Schmidt ret = -EFAULT; 3625475f6387SJan Schmidt 3626475f6387SJan Schmidt kfree(sa); 3627475f6387SJan Schmidt return ret; 3628475f6387SJan Schmidt } 3629475f6387SJan Schmidt 3630c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3631b27f7c0cSDavid Sterba void __user *arg) 3632c11d2c23SStefan Behrens { 3633c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3634c11d2c23SStefan Behrens int ret; 3635c11d2c23SStefan Behrens 3636c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3637c11d2c23SStefan Behrens if (IS_ERR(sa)) 3638c11d2c23SStefan Behrens return PTR_ERR(sa); 3639c11d2c23SStefan Behrens 3640b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3641b27f7c0cSDavid Sterba kfree(sa); 3642b27f7c0cSDavid Sterba return -EPERM; 3643b27f7c0cSDavid Sterba } 3644b27f7c0cSDavid Sterba 3645b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3646c11d2c23SStefan Behrens 3647c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3648c11d2c23SStefan Behrens ret = -EFAULT; 3649c11d2c23SStefan Behrens 3650c11d2c23SStefan Behrens kfree(sa); 3651c11d2c23SStefan Behrens return ret; 3652c11d2c23SStefan Behrens } 3653c11d2c23SStefan Behrens 36543f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 36553f6bcfbdSStefan Behrens { 36563f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36573f6bcfbdSStefan Behrens int ret; 36583f6bcfbdSStefan Behrens 36593f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36603f6bcfbdSStefan Behrens return -EPERM; 36613f6bcfbdSStefan Behrens 36623f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36633f6bcfbdSStefan Behrens if (IS_ERR(p)) 36643f6bcfbdSStefan Behrens return PTR_ERR(p); 36653f6bcfbdSStefan Behrens 36663f6bcfbdSStefan Behrens switch (p->cmd) { 36673f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3668adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3669adfa97cbSIlya Dryomov ret = -EROFS; 3670adfa97cbSIlya Dryomov goto out; 3671adfa97cbSIlya Dryomov } 36723f6bcfbdSStefan Behrens if (atomic_xchg( 36733f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36743f6bcfbdSStefan Behrens 1)) { 3675e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 36763f6bcfbdSStefan Behrens } else { 36773f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 36783f6bcfbdSStefan Behrens atomic_set( 36793f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36803f6bcfbdSStefan Behrens 0); 36813f6bcfbdSStefan Behrens } 36823f6bcfbdSStefan Behrens break; 36833f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36843f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 36853f6bcfbdSStefan Behrens ret = 0; 36863f6bcfbdSStefan Behrens break; 36873f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 36883f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 36893f6bcfbdSStefan Behrens break; 36903f6bcfbdSStefan Behrens default: 36913f6bcfbdSStefan Behrens ret = -EINVAL; 36923f6bcfbdSStefan Behrens break; 36933f6bcfbdSStefan Behrens } 36943f6bcfbdSStefan Behrens 36953f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 36963f6bcfbdSStefan Behrens ret = -EFAULT; 3697adfa97cbSIlya Dryomov out: 36983f6bcfbdSStefan Behrens kfree(p); 36993f6bcfbdSStefan Behrens return ret; 37003f6bcfbdSStefan Behrens } 37013f6bcfbdSStefan Behrens 3702d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3703d7728c96SJan Schmidt { 3704d7728c96SJan Schmidt int ret = 0; 3705d7728c96SJan Schmidt int i; 3706740c3d22SChris Mason u64 rel_ptr; 3707d7728c96SJan Schmidt int size; 3708806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3709d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3710d7728c96SJan Schmidt struct btrfs_path *path; 3711d7728c96SJan Schmidt 371282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3713d7728c96SJan Schmidt return -EPERM; 3714d7728c96SJan Schmidt 3715d7728c96SJan Schmidt path = btrfs_alloc_path(); 3716d7728c96SJan Schmidt if (!path) { 3717d7728c96SJan Schmidt ret = -ENOMEM; 3718d7728c96SJan Schmidt goto out; 3719d7728c96SJan Schmidt } 3720d7728c96SJan Schmidt 3721d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3722d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3723d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3724d7728c96SJan Schmidt ipa = NULL; 3725d7728c96SJan Schmidt goto out; 3726d7728c96SJan Schmidt } 3727d7728c96SJan Schmidt 3728d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3729d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3730d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3731d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3732d7728c96SJan Schmidt ipath = NULL; 3733d7728c96SJan Schmidt goto out; 3734d7728c96SJan Schmidt } 3735d7728c96SJan Schmidt 3736d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3737d7728c96SJan Schmidt if (ret < 0) 3738d7728c96SJan Schmidt goto out; 3739d7728c96SJan Schmidt 3740d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3741745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3742745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3743740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3744d7728c96SJan Schmidt } 3745d7728c96SJan Schmidt 3746745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3747745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3748d7728c96SJan Schmidt if (ret) { 3749d7728c96SJan Schmidt ret = -EFAULT; 3750d7728c96SJan Schmidt goto out; 3751d7728c96SJan Schmidt } 3752d7728c96SJan Schmidt 3753d7728c96SJan Schmidt out: 3754d7728c96SJan Schmidt btrfs_free_path(path); 3755d7728c96SJan Schmidt free_ipath(ipath); 3756d7728c96SJan Schmidt kfree(ipa); 3757d7728c96SJan Schmidt 3758d7728c96SJan Schmidt return ret; 3759d7728c96SJan Schmidt } 3760d7728c96SJan Schmidt 3761d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3762d7728c96SJan Schmidt { 3763d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3764d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3765d7728c96SJan Schmidt 3766d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3767d7728c96SJan Schmidt inodes->bytes_left -= c; 3768d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3769d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3770d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3771d7728c96SJan Schmidt inodes->elem_cnt += 3; 3772d7728c96SJan Schmidt } else { 3773d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3774d7728c96SJan Schmidt inodes->bytes_left = 0; 3775d7728c96SJan Schmidt inodes->elem_missed += 3; 3776d7728c96SJan Schmidt } 3777d7728c96SJan Schmidt 3778d7728c96SJan Schmidt return 0; 3779d7728c96SJan Schmidt } 3780d7728c96SJan Schmidt 3781d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3782d7728c96SJan Schmidt void __user *arg) 3783d7728c96SJan Schmidt { 3784d7728c96SJan Schmidt int ret = 0; 3785d7728c96SJan Schmidt int size; 3786d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3787d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3788d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3789d7728c96SJan Schmidt 3790d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3791d7728c96SJan Schmidt return -EPERM; 3792d7728c96SJan Schmidt 3793d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3794d7728c96SJan Schmidt if (IS_ERR(loi)) { 3795d7728c96SJan Schmidt ret = PTR_ERR(loi); 3796d7728c96SJan Schmidt loi = NULL; 3797d7728c96SJan Schmidt goto out; 3798d7728c96SJan Schmidt } 3799d7728c96SJan Schmidt 3800d7728c96SJan Schmidt path = btrfs_alloc_path(); 3801d7728c96SJan Schmidt if (!path) { 3802d7728c96SJan Schmidt ret = -ENOMEM; 3803d7728c96SJan Schmidt goto out; 3804d7728c96SJan Schmidt } 3805d7728c96SJan Schmidt 3806425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3807d7728c96SJan Schmidt inodes = init_data_container(size); 3808d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3809d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3810d7728c96SJan Schmidt inodes = NULL; 3811d7728c96SJan Schmidt goto out; 3812d7728c96SJan Schmidt } 3813d7728c96SJan Schmidt 3814df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3815df031f07SLiu Bo build_ino_list, inodes); 3816df031f07SLiu Bo if (ret == -EINVAL) 3817d7728c96SJan Schmidt ret = -ENOENT; 3818d7728c96SJan Schmidt if (ret < 0) 3819d7728c96SJan Schmidt goto out; 3820d7728c96SJan Schmidt 3821745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3822745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3823d7728c96SJan Schmidt if (ret) 3824d7728c96SJan Schmidt ret = -EFAULT; 3825d7728c96SJan Schmidt 3826d7728c96SJan Schmidt out: 3827d7728c96SJan Schmidt btrfs_free_path(path); 3828425d17a2SLiu Bo vfree(inodes); 3829d7728c96SJan Schmidt kfree(loi); 3830d7728c96SJan Schmidt 3831d7728c96SJan Schmidt return ret; 3832d7728c96SJan Schmidt } 3833d7728c96SJan Schmidt 383419a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3835c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3836c9e9f97bSIlya Dryomov { 3837c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3838c9e9f97bSIlya Dryomov 3839c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3840c9e9f97bSIlya Dryomov 3841837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3842837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3843837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3844837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3845a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3846a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3847837d5b6eSIlya Dryomov 3848c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3849c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3850c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 385119a39dceSIlya Dryomov 385219a39dceSIlya Dryomov if (lock) { 385319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 385419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 385619a39dceSIlya Dryomov } else { 385719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385819a39dceSIlya Dryomov } 3859c9e9f97bSIlya Dryomov } 3860c9e9f97bSIlya Dryomov 38619ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3862c9e9f97bSIlya Dryomov { 3863496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3864c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3865c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3866c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3867ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3868c9e9f97bSIlya Dryomov int ret; 3869c9e9f97bSIlya Dryomov 3870c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3871c9e9f97bSIlya Dryomov return -EPERM; 3872c9e9f97bSIlya Dryomov 3873e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38749ba1f6e4SLiu Bo if (ret) 38759ba1f6e4SLiu Bo return ret; 38769ba1f6e4SLiu Bo 3877ed0fb78fSIlya Dryomov again: 3878ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3879c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3880c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3881ed0fb78fSIlya Dryomov need_unlock = true; 3882ed0fb78fSIlya Dryomov goto locked; 3883ed0fb78fSIlya Dryomov } 3884ed0fb78fSIlya Dryomov 3885ed0fb78fSIlya Dryomov /* 3886ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3887ed0fb78fSIlya Dryomov * (1) some other op is running 3888ed0fb78fSIlya Dryomov * (2) balance is running 3889ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3890ed0fb78fSIlya Dryomov */ 3891ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3892ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3893ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3894ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3895ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3896ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3897ed0fb78fSIlya Dryomov goto again; 3898ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3899ed0fb78fSIlya Dryomov 3900ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3901ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3902ed0fb78fSIlya Dryomov /* this is (3) */ 3903ed0fb78fSIlya Dryomov need_unlock = false; 3904ed0fb78fSIlya Dryomov goto locked; 3905ed0fb78fSIlya Dryomov } 3906ed0fb78fSIlya Dryomov 3907ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3908ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3909ed0fb78fSIlya Dryomov goto again; 3910ed0fb78fSIlya Dryomov } else { 3911ed0fb78fSIlya Dryomov /* this is (2) */ 3912ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3913ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3914ed0fb78fSIlya Dryomov goto out; 3915ed0fb78fSIlya Dryomov } 3916ed0fb78fSIlya Dryomov } else { 3917ed0fb78fSIlya Dryomov /* this is (1) */ 3918ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3919e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3920ed0fb78fSIlya Dryomov goto out; 3921ed0fb78fSIlya Dryomov } 3922ed0fb78fSIlya Dryomov 3923ed0fb78fSIlya Dryomov locked: 3924ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3925c9e9f97bSIlya Dryomov 3926c9e9f97bSIlya Dryomov if (arg) { 3927c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3928c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3929c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3930ed0fb78fSIlya Dryomov goto out_unlock; 3931c9e9f97bSIlya Dryomov } 3932de322263SIlya Dryomov 3933de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3934de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3935de322263SIlya Dryomov ret = -ENOTCONN; 3936de322263SIlya Dryomov goto out_bargs; 3937de322263SIlya Dryomov } 3938de322263SIlya Dryomov 3939de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3940de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3941de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3942de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3943de322263SIlya Dryomov 3944de322263SIlya Dryomov goto do_balance; 3945de322263SIlya Dryomov } 3946c9e9f97bSIlya Dryomov } else { 3947c9e9f97bSIlya Dryomov bargs = NULL; 3948c9e9f97bSIlya Dryomov } 3949c9e9f97bSIlya Dryomov 3950ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3951837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3952837d5b6eSIlya Dryomov goto out_bargs; 3953837d5b6eSIlya Dryomov } 3954837d5b6eSIlya Dryomov 3955c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3956c9e9f97bSIlya Dryomov if (!bctl) { 3957c9e9f97bSIlya Dryomov ret = -ENOMEM; 3958c9e9f97bSIlya Dryomov goto out_bargs; 3959c9e9f97bSIlya Dryomov } 3960c9e9f97bSIlya Dryomov 3961c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3962c9e9f97bSIlya Dryomov if (arg) { 3963c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3964c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3965c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3966c9e9f97bSIlya Dryomov 3967c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3968f43ffb60SIlya Dryomov } else { 3969f43ffb60SIlya Dryomov /* balance everything - no filters */ 3970f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3971c9e9f97bSIlya Dryomov } 3972c9e9f97bSIlya Dryomov 3973de322263SIlya Dryomov do_balance: 3974c9e9f97bSIlya Dryomov /* 3975ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3976ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3977ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3978ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3979ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3980c9e9f97bSIlya Dryomov */ 3981ed0fb78fSIlya Dryomov need_unlock = false; 3982ed0fb78fSIlya Dryomov 3983ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3984ed0fb78fSIlya Dryomov 3985c9e9f97bSIlya Dryomov if (arg) { 3986c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3987c9e9f97bSIlya Dryomov ret = -EFAULT; 3988c9e9f97bSIlya Dryomov } 3989c9e9f97bSIlya Dryomov 3990c9e9f97bSIlya Dryomov out_bargs: 3991c9e9f97bSIlya Dryomov kfree(bargs); 3992ed0fb78fSIlya Dryomov out_unlock: 3993c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3994c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3995ed0fb78fSIlya Dryomov if (need_unlock) 3996ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3997ed0fb78fSIlya Dryomov out: 3998e54bfa31SLiu Bo mnt_drop_write_file(file); 3999c9e9f97bSIlya Dryomov return ret; 4000c9e9f97bSIlya Dryomov } 4001c9e9f97bSIlya Dryomov 4002837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4003837d5b6eSIlya Dryomov { 4004837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4005837d5b6eSIlya Dryomov return -EPERM; 4006837d5b6eSIlya Dryomov 4007837d5b6eSIlya Dryomov switch (cmd) { 4008837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4009837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4010a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4011a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4012837d5b6eSIlya Dryomov } 4013837d5b6eSIlya Dryomov 4014837d5b6eSIlya Dryomov return -EINVAL; 4015837d5b6eSIlya Dryomov } 4016837d5b6eSIlya Dryomov 401719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 401819a39dceSIlya Dryomov void __user *arg) 401919a39dceSIlya Dryomov { 402019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 402119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 402219a39dceSIlya Dryomov int ret = 0; 402319a39dceSIlya Dryomov 402419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 402519a39dceSIlya Dryomov return -EPERM; 402619a39dceSIlya Dryomov 402719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 402819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 402919a39dceSIlya Dryomov ret = -ENOTCONN; 403019a39dceSIlya Dryomov goto out; 403119a39dceSIlya Dryomov } 403219a39dceSIlya Dryomov 403319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 403419a39dceSIlya Dryomov if (!bargs) { 403519a39dceSIlya Dryomov ret = -ENOMEM; 403619a39dceSIlya Dryomov goto out; 403719a39dceSIlya Dryomov } 403819a39dceSIlya Dryomov 403919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 404019a39dceSIlya Dryomov 404119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 404219a39dceSIlya Dryomov ret = -EFAULT; 404319a39dceSIlya Dryomov 404419a39dceSIlya Dryomov kfree(bargs); 404519a39dceSIlya Dryomov out: 404619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 404719a39dceSIlya Dryomov return ret; 404819a39dceSIlya Dryomov } 404919a39dceSIlya Dryomov 4050905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40515d13a37bSArne Jansen { 4052496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40535d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40545d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 40555d13a37bSArne Jansen int ret; 40565d13a37bSArne Jansen int err; 40575d13a37bSArne Jansen 40585d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40595d13a37bSArne Jansen return -EPERM; 40605d13a37bSArne Jansen 4061905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4062905b0ddaSMiao Xie if (ret) 4063905b0ddaSMiao Xie return ret; 40645d13a37bSArne Jansen 40655d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4066905b0ddaSMiao Xie if (IS_ERR(sa)) { 4067905b0ddaSMiao Xie ret = PTR_ERR(sa); 4068905b0ddaSMiao Xie goto drop_write; 4069905b0ddaSMiao Xie } 40705d13a37bSArne Jansen 40717708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 407292f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 40735d13a37bSArne Jansen if (IS_ERR(trans)) { 40745d13a37bSArne Jansen ret = PTR_ERR(trans); 40755d13a37bSArne Jansen goto out; 40765d13a37bSArne Jansen } 40775d13a37bSArne Jansen 40785d13a37bSArne Jansen switch (sa->cmd) { 40795d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 40805d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 40815d13a37bSArne Jansen break; 40825d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 40835d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 40845d13a37bSArne Jansen break; 40855d13a37bSArne Jansen default: 40865d13a37bSArne Jansen ret = -EINVAL; 40875d13a37bSArne Jansen break; 40885d13a37bSArne Jansen } 40895d13a37bSArne Jansen 409092f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 40915d13a37bSArne Jansen if (err && !ret) 40925d13a37bSArne Jansen ret = err; 40935d13a37bSArne Jansen out: 40945d13a37bSArne Jansen kfree(sa); 40957708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4096905b0ddaSMiao Xie drop_write: 4097905b0ddaSMiao Xie mnt_drop_write_file(file); 40985d13a37bSArne Jansen return ret; 40995d13a37bSArne Jansen } 41005d13a37bSArne Jansen 4101905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41025d13a37bSArne Jansen { 4103496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41065d13a37bSArne Jansen int ret; 41075d13a37bSArne Jansen int err; 41085d13a37bSArne Jansen 41095d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41105d13a37bSArne Jansen return -EPERM; 41115d13a37bSArne Jansen 4112905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4113905b0ddaSMiao Xie if (ret) 4114905b0ddaSMiao Xie return ret; 41155d13a37bSArne Jansen 41165d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4117905b0ddaSMiao Xie if (IS_ERR(sa)) { 4118905b0ddaSMiao Xie ret = PTR_ERR(sa); 4119905b0ddaSMiao Xie goto drop_write; 4120905b0ddaSMiao Xie } 41215d13a37bSArne Jansen 41225d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41235d13a37bSArne Jansen if (IS_ERR(trans)) { 41245d13a37bSArne Jansen ret = PTR_ERR(trans); 41255d13a37bSArne Jansen goto out; 41265d13a37bSArne Jansen } 41275d13a37bSArne Jansen 41285d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41295d13a37bSArne Jansen if (sa->assign) { 41305d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 41315d13a37bSArne Jansen sa->src, sa->dst); 41325d13a37bSArne Jansen } else { 41335d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 41345d13a37bSArne Jansen sa->src, sa->dst); 41355d13a37bSArne Jansen } 41365d13a37bSArne Jansen 41375d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41385d13a37bSArne Jansen if (err && !ret) 41395d13a37bSArne Jansen ret = err; 41405d13a37bSArne Jansen 41415d13a37bSArne Jansen out: 41425d13a37bSArne Jansen kfree(sa); 4143905b0ddaSMiao Xie drop_write: 4144905b0ddaSMiao Xie mnt_drop_write_file(file); 41455d13a37bSArne Jansen return ret; 41465d13a37bSArne Jansen } 41475d13a37bSArne Jansen 4148905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41495d13a37bSArne Jansen { 4150496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41515d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41525d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41535d13a37bSArne Jansen int ret; 41545d13a37bSArne Jansen int err; 41555d13a37bSArne Jansen 41565d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41575d13a37bSArne Jansen return -EPERM; 41585d13a37bSArne Jansen 4159905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4160905b0ddaSMiao Xie if (ret) 4161905b0ddaSMiao Xie return ret; 41625d13a37bSArne Jansen 41635d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4164905b0ddaSMiao Xie if (IS_ERR(sa)) { 4165905b0ddaSMiao Xie ret = PTR_ERR(sa); 4166905b0ddaSMiao Xie goto drop_write; 4167905b0ddaSMiao Xie } 41685d13a37bSArne Jansen 4169d86e56cfSMiao Xie if (!sa->qgroupid) { 4170d86e56cfSMiao Xie ret = -EINVAL; 4171d86e56cfSMiao Xie goto out; 4172d86e56cfSMiao Xie } 4173d86e56cfSMiao Xie 41745d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41755d13a37bSArne Jansen if (IS_ERR(trans)) { 41765d13a37bSArne Jansen ret = PTR_ERR(trans); 41775d13a37bSArne Jansen goto out; 41785d13a37bSArne Jansen } 41795d13a37bSArne Jansen 41805d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41815d13a37bSArne Jansen if (sa->create) { 41825d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 41835d13a37bSArne Jansen NULL); 41845d13a37bSArne Jansen } else { 41855d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 41865d13a37bSArne Jansen } 41875d13a37bSArne Jansen 41885d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41895d13a37bSArne Jansen if (err && !ret) 41905d13a37bSArne Jansen ret = err; 41915d13a37bSArne Jansen 41925d13a37bSArne Jansen out: 41935d13a37bSArne Jansen kfree(sa); 4194905b0ddaSMiao Xie drop_write: 4195905b0ddaSMiao Xie mnt_drop_write_file(file); 41965d13a37bSArne Jansen return ret; 41975d13a37bSArne Jansen } 41985d13a37bSArne Jansen 4199905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42005d13a37bSArne Jansen { 4201496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42025d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42035d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42045d13a37bSArne Jansen int ret; 42055d13a37bSArne Jansen int err; 42065d13a37bSArne Jansen u64 qgroupid; 42075d13a37bSArne Jansen 42085d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42095d13a37bSArne Jansen return -EPERM; 42105d13a37bSArne Jansen 4211905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4212905b0ddaSMiao Xie if (ret) 4213905b0ddaSMiao Xie return ret; 42145d13a37bSArne Jansen 42155d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4216905b0ddaSMiao Xie if (IS_ERR(sa)) { 4217905b0ddaSMiao Xie ret = PTR_ERR(sa); 4218905b0ddaSMiao Xie goto drop_write; 4219905b0ddaSMiao Xie } 42205d13a37bSArne Jansen 42215d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42225d13a37bSArne Jansen if (IS_ERR(trans)) { 42235d13a37bSArne Jansen ret = PTR_ERR(trans); 42245d13a37bSArne Jansen goto out; 42255d13a37bSArne Jansen } 42265d13a37bSArne Jansen 42275d13a37bSArne Jansen qgroupid = sa->qgroupid; 42285d13a37bSArne Jansen if (!qgroupid) { 42295d13a37bSArne Jansen /* take the current subvol as qgroup */ 42305d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42315d13a37bSArne Jansen } 42325d13a37bSArne Jansen 42335d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42345d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 42355d13a37bSArne Jansen 42365d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42375d13a37bSArne Jansen if (err && !ret) 42385d13a37bSArne Jansen ret = err; 42395d13a37bSArne Jansen 42405d13a37bSArne Jansen out: 42415d13a37bSArne Jansen kfree(sa); 4242905b0ddaSMiao Xie drop_write: 4243905b0ddaSMiao Xie mnt_drop_write_file(file); 42445d13a37bSArne Jansen return ret; 42455d13a37bSArne Jansen } 42465d13a37bSArne Jansen 42472f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42482f232036SJan Schmidt { 42496d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42502f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42512f232036SJan Schmidt int ret; 42522f232036SJan Schmidt 42532f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42542f232036SJan Schmidt return -EPERM; 42552f232036SJan Schmidt 42562f232036SJan Schmidt ret = mnt_want_write_file(file); 42572f232036SJan Schmidt if (ret) 42582f232036SJan Schmidt return ret; 42592f232036SJan Schmidt 42602f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42612f232036SJan Schmidt if (IS_ERR(qsa)) { 42622f232036SJan Schmidt ret = PTR_ERR(qsa); 42632f232036SJan Schmidt goto drop_write; 42642f232036SJan Schmidt } 42652f232036SJan Schmidt 42662f232036SJan Schmidt if (qsa->flags) { 42672f232036SJan Schmidt ret = -EINVAL; 42682f232036SJan Schmidt goto out; 42692f232036SJan Schmidt } 42702f232036SJan Schmidt 42712f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 42722f232036SJan Schmidt 42732f232036SJan Schmidt out: 42742f232036SJan Schmidt kfree(qsa); 42752f232036SJan Schmidt drop_write: 42762f232036SJan Schmidt mnt_drop_write_file(file); 42772f232036SJan Schmidt return ret; 42782f232036SJan Schmidt } 42792f232036SJan Schmidt 42802f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 42812f232036SJan Schmidt { 42826d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42832f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42842f232036SJan Schmidt int ret = 0; 42852f232036SJan Schmidt 42862f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42872f232036SJan Schmidt return -EPERM; 42882f232036SJan Schmidt 42892f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 42902f232036SJan Schmidt if (!qsa) 42912f232036SJan Schmidt return -ENOMEM; 42922f232036SJan Schmidt 42932f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 42942f232036SJan Schmidt qsa->flags = 1; 42952f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 42962f232036SJan Schmidt } 42972f232036SJan Schmidt 42982f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 42992f232036SJan Schmidt ret = -EFAULT; 43002f232036SJan Schmidt 43012f232036SJan Schmidt kfree(qsa); 43022f232036SJan Schmidt return ret; 43032f232036SJan Schmidt } 43042f232036SJan Schmidt 430557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 430657254b6eSJan Schmidt { 4307*54563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 430857254b6eSJan Schmidt 430957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 431057254b6eSJan Schmidt return -EPERM; 431157254b6eSJan Schmidt 431257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 431357254b6eSJan Schmidt } 431457254b6eSJan Schmidt 43158ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 43168ea05e3aSAlexander Block void __user *arg) 43178ea05e3aSAlexander Block { 43188ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 4319496ad9aaSAl Viro struct inode *inode = file_inode(file); 43208ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43218ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43228ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 43238ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 43248ea05e3aSAlexander Block int ret = 0; 4325dd5f9615SStefan Behrens int received_uuid_changed; 43268ea05e3aSAlexander Block 43278ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43288ea05e3aSAlexander Block if (ret < 0) 43298ea05e3aSAlexander Block return ret; 43308ea05e3aSAlexander Block 43318ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 43328ea05e3aSAlexander Block 43338ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 43348ea05e3aSAlexander Block ret = -EINVAL; 43358ea05e3aSAlexander Block goto out; 43368ea05e3aSAlexander Block } 43378ea05e3aSAlexander Block 43388ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43398ea05e3aSAlexander Block ret = -EROFS; 43408ea05e3aSAlexander Block goto out; 43418ea05e3aSAlexander Block } 43428ea05e3aSAlexander Block 43438ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 43448ea05e3aSAlexander Block ret = -EACCES; 43458ea05e3aSAlexander Block goto out; 43468ea05e3aSAlexander Block } 43478ea05e3aSAlexander Block 43488ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 43498ea05e3aSAlexander Block if (IS_ERR(sa)) { 43508ea05e3aSAlexander Block ret = PTR_ERR(sa); 43518ea05e3aSAlexander Block sa = NULL; 43528ea05e3aSAlexander Block goto out; 43538ea05e3aSAlexander Block } 43548ea05e3aSAlexander Block 4355dd5f9615SStefan Behrens /* 4356dd5f9615SStefan Behrens * 1 - root item 4357dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4358dd5f9615SStefan Behrens */ 4359dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43608ea05e3aSAlexander Block if (IS_ERR(trans)) { 43618ea05e3aSAlexander Block ret = PTR_ERR(trans); 43628ea05e3aSAlexander Block trans = NULL; 43638ea05e3aSAlexander Block goto out; 43648ea05e3aSAlexander Block } 43658ea05e3aSAlexander Block 43668ea05e3aSAlexander Block sa->rtransid = trans->transid; 43678ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43688ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43698ea05e3aSAlexander Block 4370dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4371dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4372dd5f9615SStefan Behrens if (received_uuid_changed && 4373dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4374dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4375dd5f9615SStefan Behrens root_item->received_uuid, 4376dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4377dd5f9615SStefan Behrens root->root_key.objectid); 43788ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43798ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43808ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43813cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43823cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 43833cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 43843cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 43858ea05e3aSAlexander Block 43868ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 43878ea05e3aSAlexander Block &root->root_key, &root->root_item); 43888ea05e3aSAlexander Block if (ret < 0) { 43898ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 43908ea05e3aSAlexander Block goto out; 4391dd5f9615SStefan Behrens } 4392dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4393dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4394dd5f9615SStefan Behrens sa->uuid, 4395dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4396dd5f9615SStefan Behrens root->root_key.objectid); 4397dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4398dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4399dd5f9615SStefan Behrens goto out; 4400dd5f9615SStefan Behrens } 4401dd5f9615SStefan Behrens } 44028ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4403dd5f9615SStefan Behrens if (ret < 0) { 4404dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44058ea05e3aSAlexander Block goto out; 44068ea05e3aSAlexander Block } 44078ea05e3aSAlexander Block 44088ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44098ea05e3aSAlexander Block if (ret) 44108ea05e3aSAlexander Block ret = -EFAULT; 44118ea05e3aSAlexander Block 44128ea05e3aSAlexander Block out: 44138ea05e3aSAlexander Block kfree(sa); 44148ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 44158ea05e3aSAlexander Block mnt_drop_write_file(file); 44168ea05e3aSAlexander Block return ret; 44178ea05e3aSAlexander Block } 44188ea05e3aSAlexander Block 4419867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4420867ab667Sjeff.liu { 44216d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4422a1b83ac5SAnand Jain size_t len; 4423867ab667Sjeff.liu int ret; 4424a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4425a1b83ac5SAnand Jain 4426a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4427a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4428a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4429a1b83ac5SAnand Jain 4430a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4431867ab667Sjeff.liu 4432867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4433867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4434867ab667Sjeff.liu --len); 4435867ab667Sjeff.liu } 4436867ab667Sjeff.liu 4437867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4438867ab667Sjeff.liu 4439867ab667Sjeff.liu return ret ? -EFAULT : 0; 4440867ab667Sjeff.liu } 4441867ab667Sjeff.liu 4442a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4443a8bfd4abSjeff.liu { 44446d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4445a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4446a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4447a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4448a8bfd4abSjeff.liu int ret; 4449a8bfd4abSjeff.liu 4450a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4451a8bfd4abSjeff.liu return -EPERM; 4452a8bfd4abSjeff.liu 4453a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4454a8bfd4abSjeff.liu return -EFAULT; 4455a8bfd4abSjeff.liu 4456a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4457a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4458a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4459a8bfd4abSjeff.liu return -EINVAL; 4460a8bfd4abSjeff.liu } 4461a8bfd4abSjeff.liu 4462a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4463a8bfd4abSjeff.liu if (ret) 4464a8bfd4abSjeff.liu return ret; 4465a8bfd4abSjeff.liu 4466a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4467a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4468a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4469a8bfd4abSjeff.liu goto out_unlock; 4470a8bfd4abSjeff.liu } 4471a8bfd4abSjeff.liu 4472a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4473a8bfd4abSjeff.liu strcpy(super_block->label, label); 4474a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4475a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4476a8bfd4abSjeff.liu 4477a8bfd4abSjeff.liu out_unlock: 4478a8bfd4abSjeff.liu mnt_drop_write_file(file); 4479a8bfd4abSjeff.liu return ret; 4480a8bfd4abSjeff.liu } 4481a8bfd4abSjeff.liu 4482f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4483f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4484f46b5a66SChristoph Hellwig { 4485496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44864bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4487f46b5a66SChristoph Hellwig 4488f46b5a66SChristoph Hellwig switch (cmd) { 44896cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 44906cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 44916cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 44926cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 44936cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 44946cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4495f7039b1dSLi Dongyang case FITRIM: 4496f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4497f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4498fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4499fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4500fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45013de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4502fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45036f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45046f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 450576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 450676dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 45070caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45080caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 45090caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45100caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45116ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45126ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4513f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45141e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45151e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45161e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4517f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4518198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4519f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45204bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4521f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4522da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4523475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4524475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4525475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4526475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4527f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 45289ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4529f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4530c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4531c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 45327a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4533f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4534f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4535f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4536f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4537ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4538ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4539ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4540ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4541d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4542d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4543d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4544d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 45451406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45461406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 45479b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 45489b199859SFilipe David Borba Manana int ret; 45499b199859SFilipe David Borba Manana 455091aef86fSMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0); 45519b199859SFilipe David Borba Manana if (ret) 45529b199859SFilipe David Borba Manana return ret; 45539b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 45549b199859SFilipe David Borba Manana return ret; 45559b199859SFilipe David Borba Manana } 455646204592SSage Weil case BTRFS_IOC_START_SYNC: 45579a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 455846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 45599a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4560475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4561b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4562475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4563475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4564475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4565475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4566c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 45679ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4568837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4569837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 457019a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 457119a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 45728ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 45738ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 457431db9f7cSAlexander Block case BTRFS_IOC_SEND: 457531db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4576c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4577b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 45785d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4579905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 45805d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4581905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 45825d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4583905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 45845d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4585905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 45862f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 45872f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 45882f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 45892f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 459057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 459157254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 45923f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 45933f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4594867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4595867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4596a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4597a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4598416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4599416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 4600f46b5a66SChristoph Hellwig } 4601f46b5a66SChristoph Hellwig 4602f46b5a66SChristoph Hellwig return -ENOTTY; 4603f46b5a66SChristoph Hellwig } 4604