1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 464b4e25f2SChris Mason #include "compat.h" 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 59f46b5a66SChristoph Hellwig 606cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 616cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 626cbff00fSChristoph Hellwig { 636cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 646cbff00fSChristoph Hellwig return flags; 656cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 666cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 676cbff00fSChristoph Hellwig else 686cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 696cbff00fSChristoph Hellwig } 70f46b5a66SChristoph Hellwig 716cbff00fSChristoph Hellwig /* 726cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 736cbff00fSChristoph Hellwig */ 746cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 756cbff00fSChristoph Hellwig { 766cbff00fSChristoph Hellwig unsigned int iflags = 0; 776cbff00fSChristoph Hellwig 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 796cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 816cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 836cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 856cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 866cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 876cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 886cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 896cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 90d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 91d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 92d0092bddSLi Zefan 93d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 94d0092bddSLi Zefan iflags |= FS_COMPR_FL; 95d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 96d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 976cbff00fSChristoph Hellwig 986cbff00fSChristoph Hellwig return iflags; 996cbff00fSChristoph Hellwig } 1006cbff00fSChristoph Hellwig 1016cbff00fSChristoph Hellwig /* 1026cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1036cbff00fSChristoph Hellwig */ 1046cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1056cbff00fSChristoph Hellwig { 1066cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1126cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1166cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1176cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1186cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1196cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1206cbff00fSChristoph Hellwig } 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig /* 1236cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1246cbff00fSChristoph Hellwig * 125e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1266cbff00fSChristoph Hellwig */ 1276cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1286cbff00fSChristoph Hellwig { 1290b4dcea5SChris Mason unsigned int flags; 1300b4dcea5SChris Mason 1310b4dcea5SChris Mason if (!dir) 1320b4dcea5SChris Mason return; 1330b4dcea5SChris Mason 1340b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1356cbff00fSChristoph Hellwig 136e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 137e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 138e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 139e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 140e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 141e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 142e27425d6SJosef Bacik } 1436cbff00fSChristoph Hellwig 144213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 145e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 146213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 147213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 148213490b3SLiu Bo } 149e27425d6SJosef Bacik 1506cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1516cbff00fSChristoph Hellwig } 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1546cbff00fSChristoph Hellwig { 1556cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1566cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1596cbff00fSChristoph Hellwig return -EFAULT; 1606cbff00fSChristoph Hellwig return 0; 1616cbff00fSChristoph Hellwig } 1626cbff00fSChristoph Hellwig 16375e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16475e7cb7fSLiu Bo { 16575e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16675e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16775e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 168e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 169e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17075e7cb7fSLiu Bo return -EOPNOTSUPP; 17175e7cb7fSLiu Bo 17275e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17375e7cb7fSLiu Bo return -EINVAL; 17475e7cb7fSLiu Bo 17575e7cb7fSLiu Bo return 0; 17675e7cb7fSLiu Bo } 17775e7cb7fSLiu Bo 1786cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1796cbff00fSChristoph Hellwig { 1806cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1816cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1826cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1836cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1846cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1856cbff00fSChristoph Hellwig int ret; 186f062abf0SLi Zefan u64 ip_oldflags; 187f062abf0SLi Zefan unsigned int i_oldflags; 1887e97b8daSDavid Sterba umode_t mode; 1896cbff00fSChristoph Hellwig 190b83cc969SLi Zefan if (btrfs_root_readonly(root)) 191b83cc969SLi Zefan return -EROFS; 192b83cc969SLi Zefan 1936cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1946cbff00fSChristoph Hellwig return -EFAULT; 1956cbff00fSChristoph Hellwig 19675e7cb7fSLiu Bo ret = check_flags(flags); 19775e7cb7fSLiu Bo if (ret) 19875e7cb7fSLiu Bo return ret; 1996cbff00fSChristoph Hellwig 2002e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2016cbff00fSChristoph Hellwig return -EACCES; 2026cbff00fSChristoph Hellwig 203e7848683SJan Kara ret = mnt_want_write_file(file); 204e7848683SJan Kara if (ret) 205e7848683SJan Kara return ret; 206e7848683SJan Kara 2076cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2086cbff00fSChristoph Hellwig 209f062abf0SLi Zefan ip_oldflags = ip->flags; 210f062abf0SLi Zefan i_oldflags = inode->i_flags; 2117e97b8daSDavid Sterba mode = inode->i_mode; 212f062abf0SLi Zefan 2136cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2146cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2156cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2166cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2176cbff00fSChristoph Hellwig ret = -EPERM; 2186cbff00fSChristoph Hellwig goto out_unlock; 2196cbff00fSChristoph Hellwig } 2206cbff00fSChristoph Hellwig } 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2236cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2246cbff00fSChristoph Hellwig else 2256cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2266cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2306cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2346cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2386cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2396cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2406cbff00fSChristoph Hellwig else 2416cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2426cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2436cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2446cbff00fSChristoph Hellwig else 2456cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2467e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2477e97b8daSDavid Sterba if (S_ISREG(mode)) { 2487e97b8daSDavid Sterba /* 2497e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2507e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2517e97b8daSDavid Sterba * status of the file and will not set it. 2527e97b8daSDavid Sterba */ 2537e97b8daSDavid Sterba if (inode->i_size == 0) 2547e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2557e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2567e97b8daSDavid Sterba } else { 257e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2587e97b8daSDavid Sterba } 2597e97b8daSDavid Sterba } else { 2607e97b8daSDavid Sterba /* 2617e97b8daSDavid Sterba * Revert back under same assuptions as above 2627e97b8daSDavid Sterba */ 2637e97b8daSDavid Sterba if (S_ISREG(mode)) { 2647e97b8daSDavid Sterba if (inode->i_size == 0) 2657e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2667e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2677e97b8daSDavid Sterba } else { 268e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2697e97b8daSDavid Sterba } 2707e97b8daSDavid Sterba } 2716cbff00fSChristoph Hellwig 27275e7cb7fSLiu Bo /* 27375e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27475e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27575e7cb7fSLiu Bo * things smaller. 27675e7cb7fSLiu Bo */ 27775e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 27875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 27975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 28175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 28275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 283ebcb904dSLi Zefan } else { 284ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28575e7cb7fSLiu Bo } 2866cbff00fSChristoph Hellwig 2874da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 288f062abf0SLi Zefan if (IS_ERR(trans)) { 289f062abf0SLi Zefan ret = PTR_ERR(trans); 290f062abf0SLi Zefan goto out_drop; 291f062abf0SLi Zefan } 2926cbff00fSChristoph Hellwig 293306424ccSLi Zefan btrfs_update_iflags(inode); 2940c4d2d95SJosef Bacik inode_inc_iversion(inode); 295306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2966cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2976cbff00fSChristoph Hellwig 2986cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 299f062abf0SLi Zefan out_drop: 300f062abf0SLi Zefan if (ret) { 301f062abf0SLi Zefan ip->flags = ip_oldflags; 302f062abf0SLi Zefan inode->i_flags = i_oldflags; 303f062abf0SLi Zefan } 3046cbff00fSChristoph Hellwig 3056cbff00fSChristoph Hellwig out_unlock: 3066cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 307e7848683SJan Kara mnt_drop_write_file(file); 3082d4e6f6aSliubo return ret; 3096cbff00fSChristoph Hellwig } 3106cbff00fSChristoph Hellwig 3116cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3126cbff00fSChristoph Hellwig { 3136cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 3146cbff00fSChristoph Hellwig 3156cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3166cbff00fSChristoph Hellwig } 317f46b5a66SChristoph Hellwig 318f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 319f7039b1dSLi Dongyang { 320815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 321f7039b1dSLi Dongyang struct btrfs_device *device; 322f7039b1dSLi Dongyang struct request_queue *q; 323f7039b1dSLi Dongyang struct fstrim_range range; 324f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 325f7039b1dSLi Dongyang u64 num_devices = 0; 326815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 327f7039b1dSLi Dongyang int ret; 328f7039b1dSLi Dongyang 329f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 330f7039b1dSLi Dongyang return -EPERM; 331f7039b1dSLi Dongyang 3321f78160cSXiao Guangrong rcu_read_lock(); 3331f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3341f78160cSXiao Guangrong dev_list) { 335f7039b1dSLi Dongyang if (!device->bdev) 336f7039b1dSLi Dongyang continue; 337f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 338f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 339f7039b1dSLi Dongyang num_devices++; 340f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 341f7039b1dSLi Dongyang minlen); 342f7039b1dSLi Dongyang } 343f7039b1dSLi Dongyang } 3441f78160cSXiao Guangrong rcu_read_unlock(); 345f4c697e6SLukas Czerner 346f7039b1dSLi Dongyang if (!num_devices) 347f7039b1dSLi Dongyang return -EOPNOTSUPP; 348f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 349f7039b1dSLi Dongyang return -EFAULT; 350e515c18bSLukas Czerner if (range.start > total_bytes || 351e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 352f4c697e6SLukas Czerner return -EINVAL; 353f7039b1dSLi Dongyang 354f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 355f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 356815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 357f7039b1dSLi Dongyang if (ret < 0) 358f7039b1dSLi Dongyang return ret; 359f7039b1dSLi Dongyang 360f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 361f7039b1dSLi Dongyang return -EFAULT; 362f7039b1dSLi Dongyang 363f7039b1dSLi Dongyang return 0; 364f7039b1dSLi Dongyang } 365f7039b1dSLi Dongyang 366d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 367cb8e7090SChristoph Hellwig struct dentry *dentry, 36872fd032eSSage Weil char *name, int namelen, 3696f72c7e2SArne Jansen u64 *async_transid, 3708696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 371f46b5a66SChristoph Hellwig { 372f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 373f46b5a66SChristoph Hellwig struct btrfs_key key; 374f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 375f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 376f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 377d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 37876dda93cSYan, Zheng struct btrfs_root *new_root; 379d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3808ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 381f46b5a66SChristoph Hellwig int ret; 382f46b5a66SChristoph Hellwig int err; 383f46b5a66SChristoph Hellwig u64 objectid; 384f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3853de4586cSChris Mason u64 index = 0; 386d5c12070SMiao Xie u64 qgroup_reserved; 3878ea05e3aSAlexander Block uuid_le new_uuid; 388f46b5a66SChristoph Hellwig 389581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3902fbe8c8aSAl Viro if (ret) 391a22285a6SYan, Zheng return ret; 3926a912213SJosef Bacik 393d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 3949ed74f2dSJosef Bacik /* 395d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 396d5c12070SMiao Xie * of create_snapshot(). 3979ed74f2dSJosef Bacik */ 398d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 399d5c12070SMiao Xie 7, &qgroup_reserved); 400d5c12070SMiao Xie if (ret) 401d5c12070SMiao Xie return ret; 402d5c12070SMiao Xie 403d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 404d5c12070SMiao Xie if (IS_ERR(trans)) { 405d5c12070SMiao Xie ret = PTR_ERR(trans); 406d5c12070SMiao Xie goto out; 407d5c12070SMiao Xie } 408d5c12070SMiao Xie trans->block_rsv = &block_rsv; 409d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 410f46b5a66SChristoph Hellwig 4118696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4126f72c7e2SArne Jansen if (ret) 4136f72c7e2SArne Jansen goto fail; 4146f72c7e2SArne Jansen 4155d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4165581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4178e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4188e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4198e8a1e31SJosef Bacik goto fail; 4208e8a1e31SJosef Bacik } 421f46b5a66SChristoph Hellwig 4225d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 423f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 424f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4255d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 426f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 427f46b5a66SChristoph Hellwig 428f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 429f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 430f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4315d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 4325d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 4335d4f98a2SYan Zheng BTRFS_UUID_SIZE); 434f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 435f46b5a66SChristoph Hellwig 4368ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4378ea05e3aSAlexander Block 438f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 439f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 440f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 441f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 442a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 443f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 444f46b5a66SChristoph Hellwig 44508fe4db1SLi Zefan root_item.flags = 0; 44608fe4db1SLi Zefan root_item.byte_limit = 0; 44708fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 44808fe4db1SLi Zefan 449f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 45084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 451f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 452f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 45386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 45480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 455f46b5a66SChristoph Hellwig 4568ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4578ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4588ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4598ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4608ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 461dadd1105SDan Carpenter root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); 4628ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4638ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4648ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 465f46b5a66SChristoph Hellwig 466925baeddSChris Mason btrfs_tree_unlock(leaf); 467f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 468f46b5a66SChristoph Hellwig leaf = NULL; 469f46b5a66SChristoph Hellwig 470f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 471f46b5a66SChristoph Hellwig 472f46b5a66SChristoph Hellwig key.objectid = objectid; 4735d4f98a2SYan Zheng key.offset = 0; 474f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 475f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 476f46b5a66SChristoph Hellwig &root_item); 477f46b5a66SChristoph Hellwig if (ret) 478f46b5a66SChristoph Hellwig goto fail; 479f46b5a66SChristoph Hellwig 48076dda93cSYan, Zheng key.offset = (u64)-1; 48176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 48279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 48379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 48479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 48579787eaaSJeff Mahoney goto fail; 48679787eaaSJeff Mahoney } 48776dda93cSYan, Zheng 48876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 48976dda93cSYan, Zheng 490d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 491ce598979SMark Fasheh if (ret) { 492ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 49379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 494ce598979SMark Fasheh goto fail; 495ce598979SMark Fasheh } 496ce598979SMark Fasheh 497f46b5a66SChristoph Hellwig /* 498f46b5a66SChristoph Hellwig * insert the directory item 499f46b5a66SChristoph Hellwig */ 5003de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 50179787eaaSJeff Mahoney if (ret) { 50279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 50379787eaaSJeff Mahoney goto fail; 50479787eaaSJeff Mahoney } 5053de4586cSChris Mason 5063de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 50716cdcec7SMiao Xie name, namelen, dir, &key, 5083de4586cSChris Mason BTRFS_FT_DIR, index); 50979787eaaSJeff Mahoney if (ret) { 51079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 511f46b5a66SChristoph Hellwig goto fail; 51279787eaaSJeff Mahoney } 5130660b5afSChris Mason 51452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 51552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 51652c26179SYan Zheng BUG_ON(ret); 51752c26179SYan Zheng 5180660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5194df27c4dSYan, Zheng objectid, root->root_key.objectid, 52033345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 52176dda93cSYan, Zheng 5220660b5afSChris Mason BUG_ON(ret); 5230660b5afSChris Mason 524f46b5a66SChristoph Hellwig fail: 525d5c12070SMiao Xie trans->block_rsv = NULL; 526d5c12070SMiao Xie trans->bytes_reserved = 0; 52772fd032eSSage Weil if (async_transid) { 52872fd032eSSage Weil *async_transid = trans->transid; 52972fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 53072fd032eSSage Weil } else { 53176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 53272fd032eSSage Weil } 533f46b5a66SChristoph Hellwig if (err && !ret) 534f46b5a66SChristoph Hellwig ret = err; 5351a65e24bSChris Mason 5361a65e24bSChris Mason if (!ret) 5371a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 538d5c12070SMiao Xie out: 539d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 540f46b5a66SChristoph Hellwig return ret; 541f46b5a66SChristoph Hellwig } 542f46b5a66SChristoph Hellwig 543e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 544e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 545e9662f70SMiao Xie u64 *async_transid, bool readonly, 546e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 547f46b5a66SChristoph Hellwig { 5482e4bfab9SYan, Zheng struct inode *inode; 549f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 550f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5512e4bfab9SYan, Zheng int ret; 552f46b5a66SChristoph Hellwig 553f46b5a66SChristoph Hellwig if (!root->ref_cows) 554f46b5a66SChristoph Hellwig return -EINVAL; 555f46b5a66SChristoph Hellwig 556a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 557a22285a6SYan, Zheng if (!pending_snapshot) 558a22285a6SYan, Zheng return -ENOMEM; 559a22285a6SYan, Zheng 56066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 56166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 562d5c12070SMiao Xie /* 563d5c12070SMiao Xie * 1 - parent dir inode 564d5c12070SMiao Xie * 2 - dir entries 565d5c12070SMiao Xie * 1 - root item 566d5c12070SMiao Xie * 2 - root ref/backref 567d5c12070SMiao Xie * 1 - root of snapshot 568d5c12070SMiao Xie */ 569d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 570d5c12070SMiao Xie &pending_snapshot->block_rsv, 7, 571d5c12070SMiao Xie &pending_snapshot->qgroup_reserved); 572d5c12070SMiao Xie if (ret) 573d5c12070SMiao Xie goto out; 574d5c12070SMiao Xie 575a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 576a22285a6SYan, Zheng pending_snapshot->root = root; 577b83cc969SLi Zefan pending_snapshot->readonly = readonly; 578e9662f70SMiao Xie pending_snapshot->dir = dir; 5798696c533SMiao Xie pending_snapshot->inherit = inherit; 580a22285a6SYan, Zheng 581d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 582a22285a6SYan, Zheng if (IS_ERR(trans)) { 583a22285a6SYan, Zheng ret = PTR_ERR(trans); 584a22285a6SYan, Zheng goto fail; 585a22285a6SYan, Zheng } 586a22285a6SYan, Zheng 5878351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 588a22285a6SYan, Zheng list_add(&pending_snapshot->list, 589a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5908351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 59172fd032eSSage Weil if (async_transid) { 59272fd032eSSage Weil *async_transid = trans->transid; 59372fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 59472fd032eSSage Weil root->fs_info->extent_root, 1); 59572fd032eSSage Weil } else { 59672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 59772fd032eSSage Weil root->fs_info->extent_root); 59872fd032eSSage Weil } 599aec8030aSMiao Xie if (ret) 600c37b2b62SJosef Bacik goto fail; 601a22285a6SYan, Zheng 602a22285a6SYan, Zheng ret = pending_snapshot->error; 603f46b5a66SChristoph Hellwig if (ret) 6042e4bfab9SYan, Zheng goto fail; 605f46b5a66SChristoph Hellwig 60666b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 60766b4ffd1SJosef Bacik if (ret) 60866b4ffd1SJosef Bacik goto fail; 609f46b5a66SChristoph Hellwig 6102fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6112e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6122e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6132e4bfab9SYan, Zheng goto fail; 6142e4bfab9SYan, Zheng } 6152e4bfab9SYan, Zheng BUG_ON(!inode); 6162e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6172e4bfab9SYan, Zheng ret = 0; 6182e4bfab9SYan, Zheng fail: 619d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 620d5c12070SMiao Xie &pending_snapshot->block_rsv, 621d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 622d5c12070SMiao Xie out: 623a22285a6SYan, Zheng kfree(pending_snapshot); 624f46b5a66SChristoph Hellwig return ret; 625f46b5a66SChristoph Hellwig } 626f46b5a66SChristoph Hellwig 6274260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6284260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6294260f7c7SSage Weil * minimal. 6304260f7c7SSage Weil */ 6314260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6324260f7c7SSage Weil { 6332f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6344260f7c7SSage Weil 6354260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6364260f7c7SSage Weil return 0; 6372f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6384260f7c7SSage Weil return 0; 6392f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6404260f7c7SSage Weil return 0; 6414260f7c7SSage Weil return !capable(CAP_FOWNER); 6424260f7c7SSage Weil } 6434260f7c7SSage Weil 6444260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6454260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6464260f7c7SSage Weil * whether the type of victim is right. 6474260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6484260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6494260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6504260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6514260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6524260f7c7SSage Weil * a. be owner of dir, or 6534260f7c7SSage Weil * b. be owner of victim, or 6544260f7c7SSage Weil * c. have CAP_FOWNER capability 6554260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6564260f7c7SSage Weil * links pointing to it. 6574260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6584260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6594260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6604260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6614260f7c7SSage Weil * nfs_async_unlink(). 6624260f7c7SSage Weil */ 6634260f7c7SSage Weil 6644260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6654260f7c7SSage Weil { 6664260f7c7SSage Weil int error; 6674260f7c7SSage Weil 6684260f7c7SSage Weil if (!victim->d_inode) 6694260f7c7SSage Weil return -ENOENT; 6704260f7c7SSage Weil 6714260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6724fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 6734260f7c7SSage Weil 6744260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6754260f7c7SSage Weil if (error) 6764260f7c7SSage Weil return error; 6774260f7c7SSage Weil if (IS_APPEND(dir)) 6784260f7c7SSage Weil return -EPERM; 6794260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6804260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6814260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6824260f7c7SSage Weil return -EPERM; 6834260f7c7SSage Weil if (isdir) { 6844260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6854260f7c7SSage Weil return -ENOTDIR; 6864260f7c7SSage Weil if (IS_ROOT(victim)) 6874260f7c7SSage Weil return -EBUSY; 6884260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6894260f7c7SSage Weil return -EISDIR; 6904260f7c7SSage Weil if (IS_DEADDIR(dir)) 6914260f7c7SSage Weil return -ENOENT; 6924260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6934260f7c7SSage Weil return -EBUSY; 6944260f7c7SSage Weil return 0; 6954260f7c7SSage Weil } 6964260f7c7SSage Weil 697cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 698cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 699cb8e7090SChristoph Hellwig { 700cb8e7090SChristoph Hellwig if (child->d_inode) 701cb8e7090SChristoph Hellwig return -EEXIST; 702cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 703cb8e7090SChristoph Hellwig return -ENOENT; 704cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 705cb8e7090SChristoph Hellwig } 706cb8e7090SChristoph Hellwig 707cb8e7090SChristoph Hellwig /* 708cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 709cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 710cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 711cb8e7090SChristoph Hellwig */ 71276dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 71376dda93cSYan, Zheng char *name, int namelen, 71472fd032eSSage Weil struct btrfs_root *snap_src, 7156f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7168696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 717cb8e7090SChristoph Hellwig { 71876dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 719cb8e7090SChristoph Hellwig struct dentry *dentry; 720cb8e7090SChristoph Hellwig int error; 721cb8e7090SChristoph Hellwig 72276dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 723cb8e7090SChristoph Hellwig 724cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 725cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 726cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 727cb8e7090SChristoph Hellwig goto out_unlock; 728cb8e7090SChristoph Hellwig 729cb8e7090SChristoph Hellwig error = -EEXIST; 730cb8e7090SChristoph Hellwig if (dentry->d_inode) 731cb8e7090SChristoph Hellwig goto out_dput; 732cb8e7090SChristoph Hellwig 73376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 734cb8e7090SChristoph Hellwig if (error) 735a874a63eSLiu Bo goto out_dput; 736cb8e7090SChristoph Hellwig 7379c52057cSChris Mason /* 7389c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7399c52057cSChris Mason * check for them now when we can safely fail 7409c52057cSChris Mason */ 7419c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7429c52057cSChris Mason dir->i_ino, name, 7439c52057cSChris Mason namelen); 7449c52057cSChris Mason if (error) 7459c52057cSChris Mason goto out_dput; 7469c52057cSChris Mason 74776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 74876dda93cSYan, Zheng 74976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 75076dda93cSYan, Zheng goto out_up_read; 75176dda93cSYan, Zheng 7523de4586cSChris Mason if (snap_src) { 753e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7546f72c7e2SArne Jansen async_transid, readonly, inherit); 7553de4586cSChris Mason } else { 756d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 757d5c12070SMiao Xie async_transid, inherit); 7583de4586cSChris Mason } 75976dda93cSYan, Zheng if (!error) 76076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 76176dda93cSYan, Zheng out_up_read: 76276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 763cb8e7090SChristoph Hellwig out_dput: 764cb8e7090SChristoph Hellwig dput(dentry); 765cb8e7090SChristoph Hellwig out_unlock: 76676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 767cb8e7090SChristoph Hellwig return error; 768cb8e7090SChristoph Hellwig } 769cb8e7090SChristoph Hellwig 7704cb5300bSChris Mason /* 7714cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7724cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7734cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7744cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7754cb5300bSChris Mason * part of the file 7764cb5300bSChris Mason */ 7774cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7784cb5300bSChris Mason { 7794cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7804cb5300bSChris Mason struct extent_map *em = NULL; 7814cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7824cb5300bSChris Mason u64 end; 7834cb5300bSChris Mason 7844cb5300bSChris Mason read_lock(&em_tree->lock); 7854cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7864cb5300bSChris Mason read_unlock(&em_tree->lock); 7874cb5300bSChris Mason 7884cb5300bSChris Mason if (em) { 7894cb5300bSChris Mason end = extent_map_end(em); 7904cb5300bSChris Mason free_extent_map(em); 7914cb5300bSChris Mason if (end - offset > thresh) 7924cb5300bSChris Mason return 0; 7934cb5300bSChris Mason } 7944cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7954cb5300bSChris Mason thresh /= 2; 7964cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7974cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7984cb5300bSChris Mason if (end >= thresh) 7994cb5300bSChris Mason return 0; 8004cb5300bSChris Mason return 1; 8014cb5300bSChris Mason } 8024cb5300bSChris Mason 8034cb5300bSChris Mason /* 8044cb5300bSChris Mason * helper function to walk through a file and find extents 8054cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8064cb5300bSChris Mason * 8074cb5300bSChris Mason * This is used by the defragging code to find new and small 8084cb5300bSChris Mason * extents 8094cb5300bSChris Mason */ 8104cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8114cb5300bSChris Mason struct inode *inode, u64 newer_than, 8124cb5300bSChris Mason u64 *off, int thresh) 8134cb5300bSChris Mason { 8144cb5300bSChris Mason struct btrfs_path *path; 8154cb5300bSChris Mason struct btrfs_key min_key; 8164cb5300bSChris Mason struct btrfs_key max_key; 8174cb5300bSChris Mason struct extent_buffer *leaf; 8184cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8194cb5300bSChris Mason int type; 8204cb5300bSChris Mason int ret; 821a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8224cb5300bSChris Mason 8234cb5300bSChris Mason path = btrfs_alloc_path(); 8244cb5300bSChris Mason if (!path) 8254cb5300bSChris Mason return -ENOMEM; 8264cb5300bSChris Mason 827a4689d2bSDavid Sterba min_key.objectid = ino; 8284cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8294cb5300bSChris Mason min_key.offset = *off; 8304cb5300bSChris Mason 831a4689d2bSDavid Sterba max_key.objectid = ino; 8324cb5300bSChris Mason max_key.type = (u8)-1; 8334cb5300bSChris Mason max_key.offset = (u64)-1; 8344cb5300bSChris Mason 8354cb5300bSChris Mason path->keep_locks = 1; 8364cb5300bSChris Mason 8374cb5300bSChris Mason while(1) { 8384cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 839de78b51aSEric Sandeen path, newer_than); 8404cb5300bSChris Mason if (ret != 0) 8414cb5300bSChris Mason goto none; 842a4689d2bSDavid Sterba if (min_key.objectid != ino) 8434cb5300bSChris Mason goto none; 8444cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8454cb5300bSChris Mason goto none; 8464cb5300bSChris Mason 8474cb5300bSChris Mason leaf = path->nodes[0]; 8484cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8494cb5300bSChris Mason struct btrfs_file_extent_item); 8504cb5300bSChris Mason 8514cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8524cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8534cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8544cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8554cb5300bSChris Mason *off = min_key.offset; 8564cb5300bSChris Mason btrfs_free_path(path); 8574cb5300bSChris Mason return 0; 8584cb5300bSChris Mason } 8594cb5300bSChris Mason 8604cb5300bSChris Mason if (min_key.offset == (u64)-1) 8614cb5300bSChris Mason goto none; 8624cb5300bSChris Mason 8634cb5300bSChris Mason min_key.offset++; 8644cb5300bSChris Mason btrfs_release_path(path); 8654cb5300bSChris Mason } 8664cb5300bSChris Mason none: 8674cb5300bSChris Mason btrfs_free_path(path); 8684cb5300bSChris Mason return -ENOENT; 8694cb5300bSChris Mason } 8704cb5300bSChris Mason 8716c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 87217ce6ef8SLiu Bo { 87317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 874940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8756c282eb4SLi Zefan struct extent_map *em; 8766c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 877940100a4SChris Mason 878940100a4SChris Mason /* 879940100a4SChris Mason * hopefully we have this extent in the tree already, try without 880940100a4SChris Mason * the full extent lock 881940100a4SChris Mason */ 882940100a4SChris Mason read_lock(&em_tree->lock); 883940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 884940100a4SChris Mason read_unlock(&em_tree->lock); 885940100a4SChris Mason 886940100a4SChris Mason if (!em) { 887940100a4SChris Mason /* get the big lock and read metadata off disk */ 888d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 889940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 890d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 891940100a4SChris Mason 8926cf8bfbfSDan Carpenter if (IS_ERR(em)) 8936c282eb4SLi Zefan return NULL; 894940100a4SChris Mason } 895940100a4SChris Mason 8966c282eb4SLi Zefan return em; 8976c282eb4SLi Zefan } 8986c282eb4SLi Zefan 8996c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9006c282eb4SLi Zefan { 9016c282eb4SLi Zefan struct extent_map *next; 9026c282eb4SLi Zefan bool ret = true; 9036c282eb4SLi Zefan 9046c282eb4SLi Zefan /* this is the last extent */ 9056c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9066c282eb4SLi Zefan return false; 9076c282eb4SLi Zefan 9086c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9096c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9106c282eb4SLi Zefan ret = false; 9116c282eb4SLi Zefan 9126c282eb4SLi Zefan free_extent_map(next); 9136c282eb4SLi Zefan return ret; 9146c282eb4SLi Zefan } 9156c282eb4SLi Zefan 9166c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 917a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 918a43a2111SAndrew Mahone int compress) 9196c282eb4SLi Zefan { 9206c282eb4SLi Zefan struct extent_map *em; 9216c282eb4SLi Zefan int ret = 1; 9226c282eb4SLi Zefan bool next_mergeable = true; 9236c282eb4SLi Zefan 9246c282eb4SLi Zefan /* 9256c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9266c282eb4SLi Zefan * defragging it 9276c282eb4SLi Zefan */ 9286c282eb4SLi Zefan if (start < *defrag_end) 9296c282eb4SLi Zefan return 1; 9306c282eb4SLi Zefan 9316c282eb4SLi Zefan *skip = 0; 9326c282eb4SLi Zefan 9336c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9346c282eb4SLi Zefan if (!em) 9356c282eb4SLi Zefan return 0; 9366c282eb4SLi Zefan 937940100a4SChris Mason /* this will cover holes, and inline extents */ 93817ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 939940100a4SChris Mason ret = 0; 94017ce6ef8SLiu Bo goto out; 94117ce6ef8SLiu Bo } 94217ce6ef8SLiu Bo 9436c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 944940100a4SChris Mason 945940100a4SChris Mason /* 9466c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9476c282eb4SLi Zefan * real extent, don't bother defragging it 948940100a4SChris Mason */ 949a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9506c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 951940100a4SChris Mason ret = 0; 95217ce6ef8SLiu Bo out: 953940100a4SChris Mason /* 954940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 955940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 956940100a4SChris Mason * so that the next tiny extent will force a defrag. 957940100a4SChris Mason * 958940100a4SChris Mason * The end result of this is that tiny extents before a single big 959940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 960940100a4SChris Mason */ 961940100a4SChris Mason if (ret) { 962940100a4SChris Mason *defrag_end = extent_map_end(em); 963940100a4SChris Mason } else { 964940100a4SChris Mason *last_len = 0; 965940100a4SChris Mason *skip = extent_map_end(em); 966940100a4SChris Mason *defrag_end = 0; 967940100a4SChris Mason } 968940100a4SChris Mason 969940100a4SChris Mason free_extent_map(em); 970940100a4SChris Mason return ret; 971940100a4SChris Mason } 972940100a4SChris Mason 9734cb5300bSChris Mason /* 9744cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9754cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9764cb5300bSChris Mason * to COW and defrag. 9774cb5300bSChris Mason * 9784cb5300bSChris Mason * It also makes sure the delalloc code has enough 9794cb5300bSChris Mason * dirty data to avoid making new small extents as part 9804cb5300bSChris Mason * of the defrag 9814cb5300bSChris Mason * 9824cb5300bSChris Mason * It's a good idea to start RA on this range 9834cb5300bSChris Mason * before calling this. 9844cb5300bSChris Mason */ 9854cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9864cb5300bSChris Mason struct page **pages, 9874cb5300bSChris Mason unsigned long start_index, 9884cb5300bSChris Mason int num_pages) 989f46b5a66SChristoph Hellwig { 9904cb5300bSChris Mason unsigned long file_end; 9914cb5300bSChris Mason u64 isize = i_size_read(inode); 992f46b5a66SChristoph Hellwig u64 page_start; 993f46b5a66SChristoph Hellwig u64 page_end; 9941f12bd06SLiu Bo u64 page_cnt; 9954cb5300bSChris Mason int ret; 9964cb5300bSChris Mason int i; 9974cb5300bSChris Mason int i_done; 9984cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9994cb5300bSChris Mason struct extent_state *cached_state = NULL; 1000600a45e1SMiao Xie struct extent_io_tree *tree; 10013b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10024cb5300bSChris Mason 10034cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10041f12bd06SLiu Bo if (!isize || start_index > file_end) 10051f12bd06SLiu Bo return 0; 10061f12bd06SLiu Bo 10071f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10084cb5300bSChris Mason 10094cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10101f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10114cb5300bSChris Mason if (ret) 10124cb5300bSChris Mason return ret; 10134cb5300bSChris Mason i_done = 0; 1014600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10154cb5300bSChris Mason 10164cb5300bSChris Mason /* step one, lock all the pages */ 10171f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10184cb5300bSChris Mason struct page *page; 1019600a45e1SMiao Xie again: 1020a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10213b16a4e3SJosef Bacik start_index + i, mask); 10224cb5300bSChris Mason if (!page) 10234cb5300bSChris Mason break; 10244cb5300bSChris Mason 1025600a45e1SMiao Xie page_start = page_offset(page); 1026600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1027600a45e1SMiao Xie while (1) { 1028d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1029600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1030600a45e1SMiao Xie page_start); 1031d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1032600a45e1SMiao Xie if (!ordered) 1033600a45e1SMiao Xie break; 1034600a45e1SMiao Xie 1035600a45e1SMiao Xie unlock_page(page); 1036600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1037600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1038600a45e1SMiao Xie lock_page(page); 10391f12bd06SLiu Bo /* 10401f12bd06SLiu Bo * we unlocked the page above, so we need check if 10411f12bd06SLiu Bo * it was released or not. 10421f12bd06SLiu Bo */ 10431f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10441f12bd06SLiu Bo unlock_page(page); 10451f12bd06SLiu Bo page_cache_release(page); 10461f12bd06SLiu Bo goto again; 10471f12bd06SLiu Bo } 1048600a45e1SMiao Xie } 1049600a45e1SMiao Xie 10504cb5300bSChris Mason if (!PageUptodate(page)) { 10514cb5300bSChris Mason btrfs_readpage(NULL, page); 10524cb5300bSChris Mason lock_page(page); 10534cb5300bSChris Mason if (!PageUptodate(page)) { 10544cb5300bSChris Mason unlock_page(page); 10554cb5300bSChris Mason page_cache_release(page); 10564cb5300bSChris Mason ret = -EIO; 10574cb5300bSChris Mason break; 10584cb5300bSChris Mason } 10594cb5300bSChris Mason } 1060600a45e1SMiao Xie 1061600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1062600a45e1SMiao Xie unlock_page(page); 1063600a45e1SMiao Xie page_cache_release(page); 1064600a45e1SMiao Xie goto again; 1065600a45e1SMiao Xie } 1066600a45e1SMiao Xie 10674cb5300bSChris Mason pages[i] = page; 10684cb5300bSChris Mason i_done++; 10694cb5300bSChris Mason } 10704cb5300bSChris Mason if (!i_done || ret) 10714cb5300bSChris Mason goto out; 10724cb5300bSChris Mason 10734cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10744cb5300bSChris Mason goto out; 10754cb5300bSChris Mason 10764cb5300bSChris Mason /* 10774cb5300bSChris Mason * so now we have a nice long stream of locked 10784cb5300bSChris Mason * and up to date pages, lets wait on them 10794cb5300bSChris Mason */ 10804cb5300bSChris Mason for (i = 0; i < i_done; i++) 10814cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10824cb5300bSChris Mason 10834cb5300bSChris Mason page_start = page_offset(pages[0]); 10844cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10854cb5300bSChris Mason 10864cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1087d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10884cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10894cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10909e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 10919e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10924cb5300bSChris Mason 10931f12bd06SLiu Bo if (i_done != page_cnt) { 10949e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10959e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10969e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10974cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10981f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10994cb5300bSChris Mason } 11004cb5300bSChris Mason 11014cb5300bSChris Mason 11029e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11039e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11044cb5300bSChris Mason 11054cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11064cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11074cb5300bSChris Mason GFP_NOFS); 11084cb5300bSChris Mason 11094cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11104cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11114cb5300bSChris Mason ClearPageChecked(pages[i]); 11124cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11134cb5300bSChris Mason set_page_dirty(pages[i]); 11144cb5300bSChris Mason unlock_page(pages[i]); 11154cb5300bSChris Mason page_cache_release(pages[i]); 11164cb5300bSChris Mason } 11174cb5300bSChris Mason return i_done; 11184cb5300bSChris Mason out: 11194cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11204cb5300bSChris Mason unlock_page(pages[i]); 11214cb5300bSChris Mason page_cache_release(pages[i]); 11224cb5300bSChris Mason } 11231f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11244cb5300bSChris Mason return ret; 11254cb5300bSChris Mason 11264cb5300bSChris Mason } 11274cb5300bSChris Mason 11284cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11294cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11304cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11314cb5300bSChris Mason { 11324cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11334cb5300bSChris Mason struct file_ra_state *ra = NULL; 11344cb5300bSChris Mason unsigned long last_index; 1135151a31b2SLi Zefan u64 isize = i_size_read(inode); 1136940100a4SChris Mason u64 last_len = 0; 1137940100a4SChris Mason u64 skip = 0; 1138940100a4SChris Mason u64 defrag_end = 0; 11394cb5300bSChris Mason u64 newer_off = range->start; 1140f46b5a66SChristoph Hellwig unsigned long i; 1141008873eaSLi Zefan unsigned long ra_index = 0; 1142f46b5a66SChristoph Hellwig int ret; 11434cb5300bSChris Mason int defrag_count = 0; 11441a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11454cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1146008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1147008873eaSLi Zefan int cluster = max_cluster; 11484cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11494cb5300bSChris Mason struct page **pages = NULL; 11504cb5300bSChris Mason 11514cb5300bSChris Mason if (extent_thresh == 0) 11524cb5300bSChris Mason extent_thresh = 256 * 1024; 11531a419d85SLi Zefan 11541a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11551a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11561a419d85SLi Zefan return -EINVAL; 11571a419d85SLi Zefan if (range->compress_type) 11581a419d85SLi Zefan compress_type = range->compress_type; 11591a419d85SLi Zefan } 1160f46b5a66SChristoph Hellwig 1161151a31b2SLi Zefan if (isize == 0) 1162940100a4SChris Mason return 0; 1163f46b5a66SChristoph Hellwig 11644cb5300bSChris Mason /* 11654cb5300bSChris Mason * if we were not given a file, allocate a readahead 11664cb5300bSChris Mason * context 11674cb5300bSChris Mason */ 11684cb5300bSChris Mason if (!file) { 11694cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11704cb5300bSChris Mason if (!ra) 11714cb5300bSChris Mason return -ENOMEM; 11724cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11734cb5300bSChris Mason } else { 11744cb5300bSChris Mason ra = &file->f_ra; 11754cb5300bSChris Mason } 11764cb5300bSChris Mason 1177008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11784cb5300bSChris Mason GFP_NOFS); 11794cb5300bSChris Mason if (!pages) { 11804cb5300bSChris Mason ret = -ENOMEM; 11814cb5300bSChris Mason goto out_ra; 11824cb5300bSChris Mason } 11834cb5300bSChris Mason 11844cb5300bSChris Mason /* find the last page to defrag */ 11851e701a32SChris Mason if (range->start + range->len > range->start) { 1186151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11871e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11881e701a32SChris Mason } else { 1189151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11901e701a32SChris Mason } 11911e701a32SChris Mason 11924cb5300bSChris Mason if (newer_than) { 11934cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11944cb5300bSChris Mason &newer_off, 64 * 1024); 11954cb5300bSChris Mason if (!ret) { 11964cb5300bSChris Mason range->start = newer_off; 11974cb5300bSChris Mason /* 11984cb5300bSChris Mason * we always align our defrag to help keep 11994cb5300bSChris Mason * the extents in the file evenly spaced 12004cb5300bSChris Mason */ 12014cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12024cb5300bSChris Mason } else 12034cb5300bSChris Mason goto out_ra; 12044cb5300bSChris Mason } else { 12051e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12064cb5300bSChris Mason } 12074cb5300bSChris Mason if (!max_to_defrag) 12087ec31b54SLiu Bo max_to_defrag = last_index + 1; 12094cb5300bSChris Mason 12102a0f7f57SLi Zefan /* 12112a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12122a0f7f57SLi Zefan * written sequentially. 12132a0f7f57SLi Zefan */ 12142a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12152a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12162a0f7f57SLi Zefan 1217f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1218f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1219f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12204cb5300bSChris Mason /* 12214cb5300bSChris Mason * make sure we stop running if someone unmounts 12224cb5300bSChris Mason * the FS 12234cb5300bSChris Mason */ 12244cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12254cb5300bSChris Mason break; 12264cb5300bSChris Mason 1227210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1228210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1229210549ebSDavid Sterba ret = -EAGAIN; 1230210549ebSDavid Sterba break; 1231210549ebSDavid Sterba } 1232210549ebSDavid Sterba 123366c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12346c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1235a43a2111SAndrew Mahone &defrag_end, range->flags & 1236a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1237940100a4SChris Mason unsigned long next; 1238940100a4SChris Mason /* 1239940100a4SChris Mason * the should_defrag function tells us how much to skip 1240940100a4SChris Mason * bump our counter by the suggested amount 1241940100a4SChris Mason */ 1242940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1243940100a4SChris Mason i = max(i + 1, next); 1244940100a4SChris Mason continue; 1245940100a4SChris Mason } 1246008873eaSLi Zefan 1247008873eaSLi Zefan if (!newer_than) { 1248008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1249008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1250008873eaSLi Zefan cluster = min(cluster, max_cluster); 1251008873eaSLi Zefan } else { 1252008873eaSLi Zefan cluster = max_cluster; 1253008873eaSLi Zefan } 1254008873eaSLi Zefan 12551e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 12561a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1257940100a4SChris Mason 1258008873eaSLi Zefan if (i + cluster > ra_index) { 1259008873eaSLi Zefan ra_index = max(i, ra_index); 1260008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1261008873eaSLi Zefan cluster); 1262008873eaSLi Zefan ra_index += max_cluster; 1263008873eaSLi Zefan } 12644cb5300bSChris Mason 1265ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1266008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1267ecb8bea8SLiu Bo if (ret < 0) { 1268ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12694cb5300bSChris Mason goto out_ra; 1270ecb8bea8SLiu Bo } 12714cb5300bSChris Mason 12724cb5300bSChris Mason defrag_count += ret; 1273d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1274ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12754cb5300bSChris Mason 12764cb5300bSChris Mason if (newer_than) { 12774cb5300bSChris Mason if (newer_off == (u64)-1) 12784cb5300bSChris Mason break; 12794cb5300bSChris Mason 1280e1f041e1SLiu Bo if (ret > 0) 1281e1f041e1SLiu Bo i += ret; 1282e1f041e1SLiu Bo 12834cb5300bSChris Mason newer_off = max(newer_off + 1, 12844cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12854cb5300bSChris Mason 12864cb5300bSChris Mason ret = find_new_extents(root, inode, 12874cb5300bSChris Mason newer_than, &newer_off, 12884cb5300bSChris Mason 64 * 1024); 12894cb5300bSChris Mason if (!ret) { 12904cb5300bSChris Mason range->start = newer_off; 12914cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12924cb5300bSChris Mason } else { 12934cb5300bSChris Mason break; 1294940100a4SChris Mason } 12954cb5300bSChris Mason } else { 1296008873eaSLi Zefan if (ret > 0) { 1297cbcc8326SLi Zefan i += ret; 1298008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1299008873eaSLi Zefan } else { 1300940100a4SChris Mason i++; 1301008873eaSLi Zefan last_len = 0; 1302008873eaSLi Zefan } 1303f46b5a66SChristoph Hellwig } 13044cb5300bSChris Mason } 1305f46b5a66SChristoph Hellwig 13061e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13071e701a32SChris Mason filemap_flush(inode->i_mapping); 13081e701a32SChris Mason 13091e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13101e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13111e701a32SChris Mason * we have to make sure the IO is actually started and that 13121e701a32SChris Mason * ordered extents get created before we return 13131e701a32SChris Mason */ 13141e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13151e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13161e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13171e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13181e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13191e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13201e701a32SChris Mason } 13211e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13221e701a32SChris Mason 13231e701a32SChris Mason mutex_lock(&inode->i_mutex); 1324261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 13251e701a32SChris Mason mutex_unlock(&inode->i_mutex); 13261e701a32SChris Mason } 13271e701a32SChris Mason 13281a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13292b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13301a419d85SLi Zefan } 13311a419d85SLi Zefan 133260ccf82fSDiego Calleja ret = defrag_count; 1333940100a4SChris Mason 13344cb5300bSChris Mason out_ra: 13354cb5300bSChris Mason if (!file) 13364cb5300bSChris Mason kfree(ra); 13374cb5300bSChris Mason kfree(pages); 1338940100a4SChris Mason return ret; 1339f46b5a66SChristoph Hellwig } 1340f46b5a66SChristoph Hellwig 1341198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 134276dda93cSYan, Zheng void __user *arg) 1343f46b5a66SChristoph Hellwig { 1344f46b5a66SChristoph Hellwig u64 new_size; 1345f46b5a66SChristoph Hellwig u64 old_size; 1346f46b5a66SChristoph Hellwig u64 devid = 1; 1347198605a8SMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 1348f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1349f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1350f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1351f46b5a66SChristoph Hellwig char *sizestr; 1352f46b5a66SChristoph Hellwig char *devstr = NULL; 1353f46b5a66SChristoph Hellwig int ret = 0; 1354f46b5a66SChristoph Hellwig int mod = 0; 1355f46b5a66SChristoph Hellwig 1356e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1357e441d54dSChris Mason return -EPERM; 1358e441d54dSChris Mason 1359198605a8SMiao Xie ret = mnt_want_write_file(file); 1360198605a8SMiao Xie if (ret) 1361198605a8SMiao Xie return ret; 1362198605a8SMiao Xie 13635ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13645ac00addSStefan Behrens 1)) { 13655ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 136697547676SMiao Xie mnt_drop_write_file(file); 13672c0c9da0SIlya Dryomov return -EINVAL; 1368c9e9f97bSIlya Dryomov } 1369c9e9f97bSIlya Dryomov 13705ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1371dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1372c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1373c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1374c9e9f97bSIlya Dryomov goto out; 1375c9e9f97bSIlya Dryomov } 13765516e595SMark Fasheh 13775516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1378f46b5a66SChristoph Hellwig 1379f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1380f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1381f46b5a66SChristoph Hellwig if (devstr) { 1382f46b5a66SChristoph Hellwig char *end; 1383f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1384f46b5a66SChristoph Hellwig *devstr = '\0'; 1385f46b5a66SChristoph Hellwig devstr = vol_args->name; 1386f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1387dfd79829SMiao Xie if (!devid) { 1388dfd79829SMiao Xie ret = -EINVAL; 1389dfd79829SMiao Xie goto out_free; 1390dfd79829SMiao Xie } 13915bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 139221380931SJoel Becker (unsigned long long)devid); 1393f46b5a66SChristoph Hellwig } 1394dba60f3fSMiao Xie 1395aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1396f46b5a66SChristoph Hellwig if (!device) { 13975bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 139821380931SJoel Becker (unsigned long long)devid); 1399dfd79829SMiao Xie ret = -ENODEV; 1400c9e9f97bSIlya Dryomov goto out_free; 1401f46b5a66SChristoph Hellwig } 1402dba60f3fSMiao Xie 1403dba60f3fSMiao Xie if (!device->writeable) { 14044e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1405dba60f3fSMiao Xie "readonly device %llu\n", 1406a8c4a33bSChris Mason (unsigned long long)devid); 1407dfd79829SMiao Xie ret = -EPERM; 14084e42ae1bSLiu Bo goto out_free; 14094e42ae1bSLiu Bo } 14104e42ae1bSLiu Bo 1411f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1412f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1413f46b5a66SChristoph Hellwig else { 1414f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1415f46b5a66SChristoph Hellwig mod = -1; 1416f46b5a66SChristoph Hellwig sizestr++; 1417f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1418f46b5a66SChristoph Hellwig mod = 1; 1419f46b5a66SChristoph Hellwig sizestr++; 1420f46b5a66SChristoph Hellwig } 142191748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1422f46b5a66SChristoph Hellwig if (new_size == 0) { 1423f46b5a66SChristoph Hellwig ret = -EINVAL; 1424c9e9f97bSIlya Dryomov goto out_free; 1425f46b5a66SChristoph Hellwig } 1426f46b5a66SChristoph Hellwig } 1427f46b5a66SChristoph Hellwig 142863a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1429dfd79829SMiao Xie ret = -EPERM; 143063a212abSStefan Behrens goto out_free; 143163a212abSStefan Behrens } 143263a212abSStefan Behrens 1433f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1434f46b5a66SChristoph Hellwig 1435f46b5a66SChristoph Hellwig if (mod < 0) { 1436f46b5a66SChristoph Hellwig if (new_size > old_size) { 1437f46b5a66SChristoph Hellwig ret = -EINVAL; 1438c9e9f97bSIlya Dryomov goto out_free; 1439f46b5a66SChristoph Hellwig } 1440f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1441f46b5a66SChristoph Hellwig } else if (mod > 0) { 1442f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1443f46b5a66SChristoph Hellwig } 1444f46b5a66SChristoph Hellwig 1445f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1446f46b5a66SChristoph Hellwig ret = -EINVAL; 1447c9e9f97bSIlya Dryomov goto out_free; 1448f46b5a66SChristoph Hellwig } 1449f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1450f46b5a66SChristoph Hellwig ret = -EFBIG; 1451c9e9f97bSIlya Dryomov goto out_free; 1452f46b5a66SChristoph Hellwig } 1453f46b5a66SChristoph Hellwig 1454f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1455f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1456f46b5a66SChristoph Hellwig 1457606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1458606686eeSJosef Bacik rcu_str_deref(device->name), 1459606686eeSJosef Bacik (unsigned long long)new_size); 1460f46b5a66SChristoph Hellwig 1461f46b5a66SChristoph Hellwig if (new_size > old_size) { 1462a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 146398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 146498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1465c9e9f97bSIlya Dryomov goto out_free; 146698d5dc13STsutomu Itoh } 1467f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1468f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1469ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1470f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14710253f40eSjeff.liu } /* equal, nothing need to do */ 1472f46b5a66SChristoph Hellwig 1473c9e9f97bSIlya Dryomov out_free: 1474f46b5a66SChristoph Hellwig kfree(vol_args); 1475c9e9f97bSIlya Dryomov out: 1476c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 14775ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 147818f39c41SIlya Dryomov mnt_drop_write_file(file); 1479f46b5a66SChristoph Hellwig return ret; 1480f46b5a66SChristoph Hellwig } 1481f46b5a66SChristoph Hellwig 148272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 14836f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 14846f72c7e2SArne Jansen u64 *transid, bool readonly, 14858696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1486f46b5a66SChristoph Hellwig { 1487f46b5a66SChristoph Hellwig int namelen; 14883de4586cSChris Mason int ret = 0; 1489f46b5a66SChristoph Hellwig 1490a874a63eSLiu Bo ret = mnt_want_write_file(file); 1491a874a63eSLiu Bo if (ret) 1492a874a63eSLiu Bo goto out; 1493a874a63eSLiu Bo 149472fd032eSSage Weil namelen = strlen(name); 149572fd032eSSage Weil if (strchr(name, '/')) { 1496f46b5a66SChristoph Hellwig ret = -EINVAL; 1497a874a63eSLiu Bo goto out_drop_write; 1498f46b5a66SChristoph Hellwig } 1499f46b5a66SChristoph Hellwig 150016780cabSChris Mason if (name[0] == '.' && 150116780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 150216780cabSChris Mason ret = -EEXIST; 1503a874a63eSLiu Bo goto out_drop_write; 150416780cabSChris Mason } 150516780cabSChris Mason 15063de4586cSChris Mason if (subvol) { 150772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15086f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1509cb8e7090SChristoph Hellwig } else { 15102903ff01SAl Viro struct fd src = fdget(fd); 15113de4586cSChris Mason struct inode *src_inode; 15122903ff01SAl Viro if (!src.file) { 15133de4586cSChris Mason ret = -EINVAL; 1514a874a63eSLiu Bo goto out_drop_write; 15153de4586cSChris Mason } 15163de4586cSChris Mason 15172903ff01SAl Viro src_inode = src.file->f_path.dentry->d_inode; 15183de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1519d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1520d397712bSChris Mason "another FS\n"); 15213de4586cSChris Mason ret = -EINVAL; 1522ecd18815SAl Viro } else { 152372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 152472fd032eSSage Weil BTRFS_I(src_inode)->root, 15256f72c7e2SArne Jansen transid, readonly, inherit); 1526ecd18815SAl Viro } 15272903ff01SAl Viro fdput(src); 1528cb8e7090SChristoph Hellwig } 1529a874a63eSLiu Bo out_drop_write: 1530a874a63eSLiu Bo mnt_drop_write_file(file); 1531f46b5a66SChristoph Hellwig out: 153272fd032eSSage Weil return ret; 153372fd032eSSage Weil } 153472fd032eSSage Weil 153572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1536fa0d2b9bSLi Zefan void __user *arg, int subvol) 153772fd032eSSage Weil { 1538fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 153972fd032eSSage Weil int ret; 154072fd032eSSage Weil 1541fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1542fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1543fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1544fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1545fa0d2b9bSLi Zefan 1546fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1547b83cc969SLi Zefan vol_args->fd, subvol, 15486f72c7e2SArne Jansen NULL, false, NULL); 1549fa0d2b9bSLi Zefan 1550fa0d2b9bSLi Zefan kfree(vol_args); 1551fa0d2b9bSLi Zefan return ret; 1552fa0d2b9bSLi Zefan } 1553fa0d2b9bSLi Zefan 1554fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1555fa0d2b9bSLi Zefan void __user *arg, int subvol) 1556fa0d2b9bSLi Zefan { 1557fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1558fa0d2b9bSLi Zefan int ret; 1559fdfb1e4fSLi Zefan u64 transid = 0; 1560fdfb1e4fSLi Zefan u64 *ptr = NULL; 1561b83cc969SLi Zefan bool readonly = false; 15626f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 156372fd032eSSage Weil 1564fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1565fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1566fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1567fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1568fdfb1e4fSLi Zefan 1569b83cc969SLi Zefan if (vol_args->flags & 15706f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15716f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1572b83cc969SLi Zefan ret = -EOPNOTSUPP; 1573fdfb1e4fSLi Zefan goto out; 1574fdfb1e4fSLi Zefan } 1575fdfb1e4fSLi Zefan 1576fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1577fdfb1e4fSLi Zefan ptr = &transid; 1578b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1579b83cc969SLi Zefan readonly = true; 15806f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 15816f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 15826f72c7e2SArne Jansen ret = -EINVAL; 15836f72c7e2SArne Jansen goto out; 15846f72c7e2SArne Jansen } 15856f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 15866f72c7e2SArne Jansen if (IS_ERR(inherit)) { 15876f72c7e2SArne Jansen ret = PTR_ERR(inherit); 15886f72c7e2SArne Jansen goto out; 15896f72c7e2SArne Jansen } 15906f72c7e2SArne Jansen } 159175eaa0e2SSage Weil 1592fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 15936f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 15948696c533SMiao Xie readonly, inherit); 159575eaa0e2SSage Weil 1596fdfb1e4fSLi Zefan if (ret == 0 && ptr && 159775eaa0e2SSage Weil copy_to_user(arg + 1598fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1599fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 160075eaa0e2SSage Weil ret = -EFAULT; 1601fdfb1e4fSLi Zefan out: 1602f46b5a66SChristoph Hellwig kfree(vol_args); 16036f72c7e2SArne Jansen kfree(inherit); 1604f46b5a66SChristoph Hellwig return ret; 1605f46b5a66SChristoph Hellwig } 1606f46b5a66SChristoph Hellwig 16070caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16080caa102dSLi Zefan void __user *arg) 16090caa102dSLi Zefan { 16100caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 16110caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16120caa102dSLi Zefan int ret = 0; 16130caa102dSLi Zefan u64 flags = 0; 16140caa102dSLi Zefan 161533345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16160caa102dSLi Zefan return -EINVAL; 16170caa102dSLi Zefan 16180caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16190caa102dSLi Zefan if (btrfs_root_readonly(root)) 16200caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16210caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16220caa102dSLi Zefan 16230caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16240caa102dSLi Zefan ret = -EFAULT; 16250caa102dSLi Zefan 16260caa102dSLi Zefan return ret; 16270caa102dSLi Zefan } 16280caa102dSLi Zefan 16290caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16300caa102dSLi Zefan void __user *arg) 16310caa102dSLi Zefan { 16320caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 16330caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16340caa102dSLi Zefan struct btrfs_trans_handle *trans; 16350caa102dSLi Zefan u64 root_flags; 16360caa102dSLi Zefan u64 flags; 16370caa102dSLi Zefan int ret = 0; 16380caa102dSLi Zefan 1639b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1640b9ca0664SLiu Bo if (ret) 1641b9ca0664SLiu Bo goto out; 16420caa102dSLi Zefan 1643b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1644b9ca0664SLiu Bo ret = -EINVAL; 1645b9ca0664SLiu Bo goto out_drop_write; 1646b9ca0664SLiu Bo } 16470caa102dSLi Zefan 1648b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1649b9ca0664SLiu Bo ret = -EFAULT; 1650b9ca0664SLiu Bo goto out_drop_write; 1651b9ca0664SLiu Bo } 16520caa102dSLi Zefan 1653b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1654b9ca0664SLiu Bo ret = -EINVAL; 1655b9ca0664SLiu Bo goto out_drop_write; 1656b9ca0664SLiu Bo } 16570caa102dSLi Zefan 1658b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1659b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1660b9ca0664SLiu Bo goto out_drop_write; 1661b9ca0664SLiu Bo } 16620caa102dSLi Zefan 1663b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1664b9ca0664SLiu Bo ret = -EACCES; 1665b9ca0664SLiu Bo goto out_drop_write; 1666b9ca0664SLiu Bo } 1667b4dc2b8cSLi Zefan 16680caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16690caa102dSLi Zefan 16700caa102dSLi Zefan /* nothing to do */ 16710caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1672b9ca0664SLiu Bo goto out_drop_sem; 16730caa102dSLi Zefan 16740caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 16750caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 16760caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16770caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 16780caa102dSLi Zefan else 16790caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16800caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 16810caa102dSLi Zefan 16820caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 16830caa102dSLi Zefan if (IS_ERR(trans)) { 16840caa102dSLi Zefan ret = PTR_ERR(trans); 16850caa102dSLi Zefan goto out_reset; 16860caa102dSLi Zefan } 16870caa102dSLi Zefan 1688b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 16890caa102dSLi Zefan &root->root_key, &root->root_item); 16900caa102dSLi Zefan 16910caa102dSLi Zefan btrfs_commit_transaction(trans, root); 16920caa102dSLi Zefan out_reset: 16930caa102dSLi Zefan if (ret) 16940caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1695b9ca0664SLiu Bo out_drop_sem: 16960caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1697b9ca0664SLiu Bo out_drop_write: 1698b9ca0664SLiu Bo mnt_drop_write_file(file); 1699b9ca0664SLiu Bo out: 17000caa102dSLi Zefan return ret; 17010caa102dSLi Zefan } 17020caa102dSLi Zefan 170376dda93cSYan, Zheng /* 170476dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 170576dda93cSYan, Zheng */ 170676dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 170776dda93cSYan, Zheng { 170876dda93cSYan, Zheng struct btrfs_path *path; 170976dda93cSYan, Zheng struct btrfs_key key; 171076dda93cSYan, Zheng int ret; 171176dda93cSYan, Zheng 171276dda93cSYan, Zheng path = btrfs_alloc_path(); 171376dda93cSYan, Zheng if (!path) 171476dda93cSYan, Zheng return -ENOMEM; 171576dda93cSYan, Zheng 171676dda93cSYan, Zheng key.objectid = root->root_key.objectid; 171776dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 171876dda93cSYan, Zheng key.offset = (u64)-1; 171976dda93cSYan, Zheng 172076dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 172176dda93cSYan, Zheng &key, path, 0, 0); 172276dda93cSYan, Zheng if (ret < 0) 172376dda93cSYan, Zheng goto out; 172476dda93cSYan, Zheng BUG_ON(ret == 0); 172576dda93cSYan, Zheng 172676dda93cSYan, Zheng ret = 0; 172776dda93cSYan, Zheng if (path->slots[0] > 0) { 172876dda93cSYan, Zheng path->slots[0]--; 172976dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 173076dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 173176dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 173276dda93cSYan, Zheng ret = -ENOTEMPTY; 173376dda93cSYan, Zheng } 173476dda93cSYan, Zheng out: 173576dda93cSYan, Zheng btrfs_free_path(path); 173676dda93cSYan, Zheng return ret; 173776dda93cSYan, Zheng } 173876dda93cSYan, Zheng 1739ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1740ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1741ac8e9819SChris Mason { 1742abc6e134SChris Mason struct btrfs_key test; 1743abc6e134SChris Mason int ret; 1744abc6e134SChris Mason 1745abc6e134SChris Mason test.objectid = sk->min_objectid; 1746abc6e134SChris Mason test.type = sk->min_type; 1747abc6e134SChris Mason test.offset = sk->min_offset; 1748abc6e134SChris Mason 1749abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1750abc6e134SChris Mason if (ret < 0) 1751ac8e9819SChris Mason return 0; 1752abc6e134SChris Mason 1753abc6e134SChris Mason test.objectid = sk->max_objectid; 1754abc6e134SChris Mason test.type = sk->max_type; 1755abc6e134SChris Mason test.offset = sk->max_offset; 1756abc6e134SChris Mason 1757abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1758abc6e134SChris Mason if (ret > 0) 1759ac8e9819SChris Mason return 0; 1760ac8e9819SChris Mason return 1; 1761ac8e9819SChris Mason } 1762ac8e9819SChris Mason 1763ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1764ac8e9819SChris Mason struct btrfs_path *path, 1765ac8e9819SChris Mason struct btrfs_key *key, 1766ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1767ac8e9819SChris Mason char *buf, 1768ac8e9819SChris Mason unsigned long *sk_offset, 1769ac8e9819SChris Mason int *num_found) 1770ac8e9819SChris Mason { 1771ac8e9819SChris Mason u64 found_transid; 1772ac8e9819SChris Mason struct extent_buffer *leaf; 1773ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1774ac8e9819SChris Mason unsigned long item_off; 1775ac8e9819SChris Mason unsigned long item_len; 1776ac8e9819SChris Mason int nritems; 1777ac8e9819SChris Mason int i; 1778ac8e9819SChris Mason int slot; 1779ac8e9819SChris Mason int ret = 0; 1780ac8e9819SChris Mason 1781ac8e9819SChris Mason leaf = path->nodes[0]; 1782ac8e9819SChris Mason slot = path->slots[0]; 1783ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1784ac8e9819SChris Mason 1785ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1786ac8e9819SChris Mason i = nritems; 1787ac8e9819SChris Mason goto advance_key; 1788ac8e9819SChris Mason } 1789ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1790ac8e9819SChris Mason 1791ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1792ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1793ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1794ac8e9819SChris Mason 1795ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1796ac8e9819SChris Mason item_len = 0; 1797ac8e9819SChris Mason 1798ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1799ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1800ac8e9819SChris Mason ret = 1; 1801ac8e9819SChris Mason goto overflow; 1802ac8e9819SChris Mason } 1803ac8e9819SChris Mason 1804ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1805ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1806ac8e9819SChris Mason continue; 1807ac8e9819SChris Mason 1808ac8e9819SChris Mason sh.objectid = key->objectid; 1809ac8e9819SChris Mason sh.offset = key->offset; 1810ac8e9819SChris Mason sh.type = key->type; 1811ac8e9819SChris Mason sh.len = item_len; 1812ac8e9819SChris Mason sh.transid = found_transid; 1813ac8e9819SChris Mason 1814ac8e9819SChris Mason /* copy search result header */ 1815ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1816ac8e9819SChris Mason *sk_offset += sizeof(sh); 1817ac8e9819SChris Mason 1818ac8e9819SChris Mason if (item_len) { 1819ac8e9819SChris Mason char *p = buf + *sk_offset; 1820ac8e9819SChris Mason /* copy the item */ 1821ac8e9819SChris Mason read_extent_buffer(leaf, p, 1822ac8e9819SChris Mason item_off, item_len); 1823ac8e9819SChris Mason *sk_offset += item_len; 1824ac8e9819SChris Mason } 1825e2156867SHugo Mills (*num_found)++; 1826ac8e9819SChris Mason 1827ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1828ac8e9819SChris Mason break; 1829ac8e9819SChris Mason } 1830ac8e9819SChris Mason advance_key: 1831ac8e9819SChris Mason ret = 0; 1832abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1833abc6e134SChris Mason key->offset++; 1834abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1835abc6e134SChris Mason key->offset = 0; 1836abc6e134SChris Mason key->type++; 1837abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1838abc6e134SChris Mason key->offset = 0; 1839abc6e134SChris Mason key->type = 0; 1840abc6e134SChris Mason key->objectid++; 1841abc6e134SChris Mason } else 1842abc6e134SChris Mason ret = 1; 1843ac8e9819SChris Mason overflow: 1844ac8e9819SChris Mason return ret; 1845ac8e9819SChris Mason } 1846ac8e9819SChris Mason 1847ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1848ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1849ac8e9819SChris Mason { 1850ac8e9819SChris Mason struct btrfs_root *root; 1851ac8e9819SChris Mason struct btrfs_key key; 1852ac8e9819SChris Mason struct btrfs_key max_key; 1853ac8e9819SChris Mason struct btrfs_path *path; 1854ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1855ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1856ac8e9819SChris Mason int ret; 1857ac8e9819SChris Mason int num_found = 0; 1858ac8e9819SChris Mason unsigned long sk_offset = 0; 1859ac8e9819SChris Mason 1860ac8e9819SChris Mason path = btrfs_alloc_path(); 1861ac8e9819SChris Mason if (!path) 1862ac8e9819SChris Mason return -ENOMEM; 1863ac8e9819SChris Mason 1864ac8e9819SChris Mason if (sk->tree_id == 0) { 1865ac8e9819SChris Mason /* search the root of the inode that was passed */ 1866ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1867ac8e9819SChris Mason } else { 1868ac8e9819SChris Mason key.objectid = sk->tree_id; 1869ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1870ac8e9819SChris Mason key.offset = (u64)-1; 1871ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1872ac8e9819SChris Mason if (IS_ERR(root)) { 1873ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1874ac8e9819SChris Mason sk->tree_id); 1875ac8e9819SChris Mason btrfs_free_path(path); 1876ac8e9819SChris Mason return -ENOENT; 1877ac8e9819SChris Mason } 1878ac8e9819SChris Mason } 1879ac8e9819SChris Mason 1880ac8e9819SChris Mason key.objectid = sk->min_objectid; 1881ac8e9819SChris Mason key.type = sk->min_type; 1882ac8e9819SChris Mason key.offset = sk->min_offset; 1883ac8e9819SChris Mason 1884ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1885ac8e9819SChris Mason max_key.type = sk->max_type; 1886ac8e9819SChris Mason max_key.offset = sk->max_offset; 1887ac8e9819SChris Mason 1888ac8e9819SChris Mason path->keep_locks = 1; 1889ac8e9819SChris Mason 1890ac8e9819SChris Mason while(1) { 1891de78b51aSEric Sandeen ret = btrfs_search_forward(root, &key, &max_key, path, 1892ac8e9819SChris Mason sk->min_transid); 1893ac8e9819SChris Mason if (ret != 0) { 1894ac8e9819SChris Mason if (ret > 0) 1895ac8e9819SChris Mason ret = 0; 1896ac8e9819SChris Mason goto err; 1897ac8e9819SChris Mason } 1898ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1899ac8e9819SChris Mason &sk_offset, &num_found); 1900b3b4aa74SDavid Sterba btrfs_release_path(path); 1901ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1902ac8e9819SChris Mason break; 1903ac8e9819SChris Mason 1904ac8e9819SChris Mason } 1905ac8e9819SChris Mason ret = 0; 1906ac8e9819SChris Mason err: 1907ac8e9819SChris Mason sk->nr_items = num_found; 1908ac8e9819SChris Mason btrfs_free_path(path); 1909ac8e9819SChris Mason return ret; 1910ac8e9819SChris Mason } 1911ac8e9819SChris Mason 1912ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1913ac8e9819SChris Mason void __user *argp) 1914ac8e9819SChris Mason { 1915ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1916ac8e9819SChris Mason struct inode *inode; 1917ac8e9819SChris Mason int ret; 1918ac8e9819SChris Mason 1919ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1920ac8e9819SChris Mason return -EPERM; 1921ac8e9819SChris Mason 19222354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19232354d08fSJulia Lawall if (IS_ERR(args)) 19242354d08fSJulia Lawall return PTR_ERR(args); 1925ac8e9819SChris Mason 1926ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1927ac8e9819SChris Mason ret = search_ioctl(inode, args); 1928ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1929ac8e9819SChris Mason ret = -EFAULT; 1930ac8e9819SChris Mason kfree(args); 1931ac8e9819SChris Mason return ret; 1932ac8e9819SChris Mason } 1933ac8e9819SChris Mason 193498d377a0STARUISI Hiroaki /* 1935ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1936ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 193798d377a0STARUISI Hiroaki */ 193898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 193998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 194098d377a0STARUISI Hiroaki { 194198d377a0STARUISI Hiroaki struct btrfs_root *root; 194298d377a0STARUISI Hiroaki struct btrfs_key key; 1943ac8e9819SChris Mason char *ptr; 194498d377a0STARUISI Hiroaki int ret = -1; 194598d377a0STARUISI Hiroaki int slot; 194698d377a0STARUISI Hiroaki int len; 194798d377a0STARUISI Hiroaki int total_len = 0; 194898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 194998d377a0STARUISI Hiroaki struct extent_buffer *l; 195098d377a0STARUISI Hiroaki struct btrfs_path *path; 195198d377a0STARUISI Hiroaki 195298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 195398d377a0STARUISI Hiroaki name[0]='\0'; 195498d377a0STARUISI Hiroaki return 0; 195598d377a0STARUISI Hiroaki } 195698d377a0STARUISI Hiroaki 195798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 195898d377a0STARUISI Hiroaki if (!path) 195998d377a0STARUISI Hiroaki return -ENOMEM; 196098d377a0STARUISI Hiroaki 1961ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 196298d377a0STARUISI Hiroaki 196398d377a0STARUISI Hiroaki key.objectid = tree_id; 196498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 196598d377a0STARUISI Hiroaki key.offset = (u64)-1; 196698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 196798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 196898d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 19698ad6fcabSChris Mason ret = -ENOENT; 19708ad6fcabSChris Mason goto out; 197198d377a0STARUISI Hiroaki } 197298d377a0STARUISI Hiroaki 197398d377a0STARUISI Hiroaki key.objectid = dirid; 197498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 19758ad6fcabSChris Mason key.offset = (u64)-1; 197698d377a0STARUISI Hiroaki 197798d377a0STARUISI Hiroaki while(1) { 197898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 197998d377a0STARUISI Hiroaki if (ret < 0) 198098d377a0STARUISI Hiroaki goto out; 198198d377a0STARUISI Hiroaki 198298d377a0STARUISI Hiroaki l = path->nodes[0]; 198398d377a0STARUISI Hiroaki slot = path->slots[0]; 19848ad6fcabSChris Mason if (ret > 0 && slot > 0) 19858ad6fcabSChris Mason slot--; 198698d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 198798d377a0STARUISI Hiroaki 198898d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1989ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1990ac8e9819SChris Mason ret = -ENOENT; 199198d377a0STARUISI Hiroaki goto out; 1992ac8e9819SChris Mason } 199398d377a0STARUISI Hiroaki 199498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 199598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 199698d377a0STARUISI Hiroaki ptr -= len + 1; 199798d377a0STARUISI Hiroaki total_len += len + 1; 1998ac8e9819SChris Mason if (ptr < name) 199998d377a0STARUISI Hiroaki goto out; 200098d377a0STARUISI Hiroaki 200198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 200298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 200398d377a0STARUISI Hiroaki 200498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 200598d377a0STARUISI Hiroaki break; 200698d377a0STARUISI Hiroaki 2007b3b4aa74SDavid Sterba btrfs_release_path(path); 200898d377a0STARUISI Hiroaki key.objectid = key.offset; 20098ad6fcabSChris Mason key.offset = (u64)-1; 201098d377a0STARUISI Hiroaki dirid = key.objectid; 201198d377a0STARUISI Hiroaki } 2012ac8e9819SChris Mason if (ptr < name) 201398d377a0STARUISI Hiroaki goto out; 201477906a50SLi Zefan memmove(name, ptr, total_len); 201598d377a0STARUISI Hiroaki name[total_len]='\0'; 201698d377a0STARUISI Hiroaki ret = 0; 201798d377a0STARUISI Hiroaki out: 201898d377a0STARUISI Hiroaki btrfs_free_path(path); 2019ac8e9819SChris Mason return ret; 2020ac8e9819SChris Mason } 2021ac8e9819SChris Mason 2022ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2023ac8e9819SChris Mason void __user *argp) 2024ac8e9819SChris Mason { 2025ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2026ac8e9819SChris Mason struct inode *inode; 2027ac8e9819SChris Mason int ret; 2028ac8e9819SChris Mason 2029ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2030ac8e9819SChris Mason return -EPERM; 2031ac8e9819SChris Mason 20322354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20332354d08fSJulia Lawall if (IS_ERR(args)) 20342354d08fSJulia Lawall return PTR_ERR(args); 2035c2b96929SDan Carpenter 2036ac8e9819SChris Mason inode = fdentry(file)->d_inode; 2037ac8e9819SChris Mason 20381b53ac4dSChris Mason if (args->treeid == 0) 20391b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20401b53ac4dSChris Mason 2041ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2042ac8e9819SChris Mason args->treeid, args->objectid, 2043ac8e9819SChris Mason args->name); 2044ac8e9819SChris Mason 2045ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2046ac8e9819SChris Mason ret = -EFAULT; 2047ac8e9819SChris Mason 2048ac8e9819SChris Mason kfree(args); 204998d377a0STARUISI Hiroaki return ret; 205098d377a0STARUISI Hiroaki } 205198d377a0STARUISI Hiroaki 205276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 205376dda93cSYan, Zheng void __user *arg) 205476dda93cSYan, Zheng { 205576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 205676dda93cSYan, Zheng struct dentry *dentry; 205776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 205876dda93cSYan, Zheng struct inode *inode; 205976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 206076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 206176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 206276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2063c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2064c58aaad2SMiao Xie u64 qgroup_reserved; 206576dda93cSYan, Zheng int namelen; 206676dda93cSYan, Zheng int ret; 206776dda93cSYan, Zheng int err = 0; 206876dda93cSYan, Zheng 206976dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 207076dda93cSYan, Zheng if (IS_ERR(vol_args)) 207176dda93cSYan, Zheng return PTR_ERR(vol_args); 207276dda93cSYan, Zheng 207376dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 207476dda93cSYan, Zheng namelen = strlen(vol_args->name); 207576dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 207676dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 207776dda93cSYan, Zheng err = -EINVAL; 207876dda93cSYan, Zheng goto out; 207976dda93cSYan, Zheng } 208076dda93cSYan, Zheng 2081a561be71SAl Viro err = mnt_want_write_file(file); 208276dda93cSYan, Zheng if (err) 208376dda93cSYan, Zheng goto out; 208476dda93cSYan, Zheng 208576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 208676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 208776dda93cSYan, Zheng if (IS_ERR(dentry)) { 208876dda93cSYan, Zheng err = PTR_ERR(dentry); 208976dda93cSYan, Zheng goto out_unlock_dir; 209076dda93cSYan, Zheng } 209176dda93cSYan, Zheng 209276dda93cSYan, Zheng if (!dentry->d_inode) { 209376dda93cSYan, Zheng err = -ENOENT; 209476dda93cSYan, Zheng goto out_dput; 209576dda93cSYan, Zheng } 209676dda93cSYan, Zheng 209776dda93cSYan, Zheng inode = dentry->d_inode; 20984260f7c7SSage Weil dest = BTRFS_I(inode)->root; 20994260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 21004260f7c7SSage Weil /* 21014260f7c7SSage Weil * Regular user. Only allow this with a special mount 21024260f7c7SSage Weil * option, when the user has write+exec access to the 21034260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21044260f7c7SSage Weil * allowed. 21054260f7c7SSage Weil * 21064260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21074260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21084260f7c7SSage Weil * otherwise be able to delete. 21094260f7c7SSage Weil * 21104260f7c7SSage Weil * Users who want to delete empty subvols should try 21114260f7c7SSage Weil * rmdir(2). 21124260f7c7SSage Weil */ 21134260f7c7SSage Weil err = -EPERM; 21144260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21154260f7c7SSage Weil goto out_dput; 21164260f7c7SSage Weil 21174260f7c7SSage Weil /* 21184260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21194260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21204260f7c7SSage Weil * must be called on the dentry referencing the root 21214260f7c7SSage Weil * of the subvol, not a random directory contained 21224260f7c7SSage Weil * within it. 21234260f7c7SSage Weil */ 21244260f7c7SSage Weil err = -EINVAL; 21254260f7c7SSage Weil if (root == dest) 21264260f7c7SSage Weil goto out_dput; 21274260f7c7SSage Weil 21284260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21294260f7c7SSage Weil if (err) 21304260f7c7SSage Weil goto out_dput; 21315c39da5bSMiao Xie } 21324260f7c7SSage Weil 21335c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21344260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21354260f7c7SSage Weil if (err) 21364260f7c7SSage Weil goto out_dput; 21374260f7c7SSage Weil 213833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 213976dda93cSYan, Zheng err = -EINVAL; 214076dda93cSYan, Zheng goto out_dput; 214176dda93cSYan, Zheng } 214276dda93cSYan, Zheng 214376dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 214476dda93cSYan, Zheng err = d_invalidate(dentry); 214576dda93cSYan, Zheng if (err) 214676dda93cSYan, Zheng goto out_unlock; 214776dda93cSYan, Zheng 214876dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 214976dda93cSYan, Zheng 215076dda93cSYan, Zheng err = may_destroy_subvol(dest); 215176dda93cSYan, Zheng if (err) 215276dda93cSYan, Zheng goto out_up_write; 215376dda93cSYan, Zheng 2154c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2155c58aaad2SMiao Xie /* 2156c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2157c58aaad2SMiao Xie * ref/backref. 2158c58aaad2SMiao Xie */ 2159c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2160c58aaad2SMiao Xie 5, &qgroup_reserved); 2161c58aaad2SMiao Xie if (err) 2162c58aaad2SMiao Xie goto out_up_write; 2163c58aaad2SMiao Xie 2164a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2165a22285a6SYan, Zheng if (IS_ERR(trans)) { 2166a22285a6SYan, Zheng err = PTR_ERR(trans); 2167c58aaad2SMiao Xie goto out_release; 2168a22285a6SYan, Zheng } 2169c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2170c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2171a22285a6SYan, Zheng 217276dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 217376dda93cSYan, Zheng dest->root_key.objectid, 217476dda93cSYan, Zheng dentry->d_name.name, 217576dda93cSYan, Zheng dentry->d_name.len); 217679787eaaSJeff Mahoney if (ret) { 217779787eaaSJeff Mahoney err = ret; 217879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 217979787eaaSJeff Mahoney goto out_end_trans; 218079787eaaSJeff Mahoney } 218176dda93cSYan, Zheng 218276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 218376dda93cSYan, Zheng 218476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 218576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 218676dda93cSYan, Zheng dest->root_item.drop_level = 0; 218776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 218876dda93cSYan, Zheng 2189d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 219076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 219176dda93cSYan, Zheng root->fs_info->tree_root, 219276dda93cSYan, Zheng dest->root_key.objectid); 219379787eaaSJeff Mahoney if (ret) { 219479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 219579787eaaSJeff Mahoney err = ret; 219679787eaaSJeff Mahoney goto out_end_trans; 2197d68fc57bSYan, Zheng } 219879787eaaSJeff Mahoney } 219979787eaaSJeff Mahoney out_end_trans: 2200c58aaad2SMiao Xie trans->block_rsv = NULL; 2201c58aaad2SMiao Xie trans->bytes_reserved = 0; 2202531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 220379787eaaSJeff Mahoney if (ret && !err) 220479787eaaSJeff Mahoney err = ret; 220576dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2206c58aaad2SMiao Xie out_release: 2207c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 220876dda93cSYan, Zheng out_up_write: 220976dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 221076dda93cSYan, Zheng out_unlock: 221176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 221276dda93cSYan, Zheng if (!err) { 2213efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 221476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 221576dda93cSYan, Zheng d_delete(dentry); 2216fa6ac876SLiu Bo 2217fa6ac876SLiu Bo /* the last ref */ 2218fa6ac876SLiu Bo if (dest->cache_inode) { 2219fa6ac876SLiu Bo iput(dest->cache_inode); 2220fa6ac876SLiu Bo dest->cache_inode = NULL; 2221fa6ac876SLiu Bo } 222276dda93cSYan, Zheng } 222376dda93cSYan, Zheng out_dput: 222476dda93cSYan, Zheng dput(dentry); 222576dda93cSYan, Zheng out_unlock_dir: 222676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 22272a79f17eSAl Viro mnt_drop_write_file(file); 222876dda93cSYan, Zheng out: 222976dda93cSYan, Zheng kfree(vol_args); 223076dda93cSYan, Zheng return err; 223176dda93cSYan, Zheng } 223276dda93cSYan, Zheng 22331e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2234f46b5a66SChristoph Hellwig { 2235f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2236f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22371e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2238c146afadSYan Zheng int ret; 2239c146afadSYan Zheng 224025122d15SIlya Dryomov ret = mnt_want_write_file(file); 224125122d15SIlya Dryomov if (ret) 224225122d15SIlya Dryomov return ret; 2243b83cc969SLi Zefan 22445ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 22455ac00addSStefan Behrens 1)) { 22465ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 224725122d15SIlya Dryomov mnt_drop_write_file(file); 22482c0c9da0SIlya Dryomov return -EINVAL; 22495ac00addSStefan Behrens } 225025122d15SIlya Dryomov 225125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 225225122d15SIlya Dryomov ret = -EROFS; 225325122d15SIlya Dryomov goto out; 22545ac00addSStefan Behrens } 2255f46b5a66SChristoph Hellwig 2256f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2257f46b5a66SChristoph Hellwig case S_IFDIR: 2258e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2259e441d54dSChris Mason ret = -EPERM; 2260e441d54dSChris Mason goto out; 2261e441d54dSChris Mason } 2262de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 22638929ecfaSYan, Zheng if (ret) 22648929ecfaSYan, Zheng goto out; 2265de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2266f46b5a66SChristoph Hellwig break; 2267f46b5a66SChristoph Hellwig case S_IFREG: 2268e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2269e441d54dSChris Mason ret = -EINVAL; 2270e441d54dSChris Mason goto out; 2271e441d54dSChris Mason } 22721e701a32SChris Mason 22731e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 22741e701a32SChris Mason if (!range) { 22751e701a32SChris Mason ret = -ENOMEM; 22761e701a32SChris Mason goto out; 22771e701a32SChris Mason } 22781e701a32SChris Mason 22791e701a32SChris Mason if (argp) { 22801e701a32SChris Mason if (copy_from_user(range, argp, 22811e701a32SChris Mason sizeof(*range))) { 22821e701a32SChris Mason ret = -EFAULT; 22831e701a32SChris Mason kfree(range); 2284683be16eSDan Carpenter goto out; 22851e701a32SChris Mason } 22861e701a32SChris Mason /* compression requires us to start the IO */ 22871e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 22881e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 22891e701a32SChris Mason range->extent_thresh = (u32)-1; 22901e701a32SChris Mason } 22911e701a32SChris Mason } else { 22921e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 22931e701a32SChris Mason range->len = (u64)-1; 22941e701a32SChris Mason } 22954cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 22964cb5300bSChris Mason range, 0, 0); 22974cb5300bSChris Mason if (ret > 0) 22984cb5300bSChris Mason ret = 0; 22991e701a32SChris Mason kfree(range); 2300f46b5a66SChristoph Hellwig break; 23018929ecfaSYan, Zheng default: 23028929ecfaSYan, Zheng ret = -EINVAL; 2303f46b5a66SChristoph Hellwig } 2304e441d54dSChris Mason out: 23055ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 230625122d15SIlya Dryomov mnt_drop_write_file(file); 2307e441d54dSChris Mason return ret; 2308f46b5a66SChristoph Hellwig } 2309f46b5a66SChristoph Hellwig 2310b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2311f46b5a66SChristoph Hellwig { 2312f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2313f46b5a66SChristoph Hellwig int ret; 2314f46b5a66SChristoph Hellwig 2315e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2316e441d54dSChris Mason return -EPERM; 2317e441d54dSChris Mason 23185ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23195ac00addSStefan Behrens 1)) { 23205ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 23212c0c9da0SIlya Dryomov return -EINVAL; 2322c9e9f97bSIlya Dryomov } 2323c9e9f97bSIlya Dryomov 23245ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2325dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2326c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2327c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2328c9e9f97bSIlya Dryomov goto out; 2329c9e9f97bSIlya Dryomov } 2330f46b5a66SChristoph Hellwig 23315516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2332f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2333f46b5a66SChristoph Hellwig 2334f46b5a66SChristoph Hellwig kfree(vol_args); 2335c9e9f97bSIlya Dryomov out: 2336c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23375ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2338f46b5a66SChristoph Hellwig return ret; 2339f46b5a66SChristoph Hellwig } 2340f46b5a66SChristoph Hellwig 2341da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2342f46b5a66SChristoph Hellwig { 2343da24927bSMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 2344f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2345f46b5a66SChristoph Hellwig int ret; 2346f46b5a66SChristoph Hellwig 2347e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2348e441d54dSChris Mason return -EPERM; 2349e441d54dSChris Mason 2350da24927bSMiao Xie ret = mnt_want_write_file(file); 2351da24927bSMiao Xie if (ret) 2352da24927bSMiao Xie return ret; 2353c146afadSYan Zheng 23545ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23555ac00addSStefan Behrens 1)) { 23565ac00addSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 2357da24927bSMiao Xie mnt_drop_write_file(file); 23582c0c9da0SIlya Dryomov return -EINVAL; 2359c9e9f97bSIlya Dryomov } 2360c9e9f97bSIlya Dryomov 23615ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2362dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2363c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2364c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2365c9e9f97bSIlya Dryomov goto out; 2366c9e9f97bSIlya Dryomov } 2367f46b5a66SChristoph Hellwig 23685516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2369f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2370f46b5a66SChristoph Hellwig 2371f46b5a66SChristoph Hellwig kfree(vol_args); 2372c9e9f97bSIlya Dryomov out: 2373c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23745ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 23754ac20c70SIlya Dryomov mnt_drop_write_file(file); 2376f46b5a66SChristoph Hellwig return ret; 2377f46b5a66SChristoph Hellwig } 2378f46b5a66SChristoph Hellwig 2379475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2380475f6387SJan Schmidt { 2381027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2382475f6387SJan Schmidt struct btrfs_device *device; 2383475f6387SJan Schmidt struct btrfs_device *next; 2384475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2385027ed2f0SLi Zefan int ret = 0; 2386475f6387SJan Schmidt 2387475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2388475f6387SJan Schmidt return -EPERM; 2389475f6387SJan Schmidt 2390027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2391027ed2f0SLi Zefan if (!fi_args) 2392027ed2f0SLi Zefan return -ENOMEM; 2393027ed2f0SLi Zefan 2394027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2395027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2396475f6387SJan Schmidt 2397475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2398475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2399027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2400027ed2f0SLi Zefan fi_args->max_id = device->devid; 2401475f6387SJan Schmidt } 2402475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2403475f6387SJan Schmidt 2404027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2405027ed2f0SLi Zefan ret = -EFAULT; 2406475f6387SJan Schmidt 2407027ed2f0SLi Zefan kfree(fi_args); 2408027ed2f0SLi Zefan return ret; 2409475f6387SJan Schmidt } 2410475f6387SJan Schmidt 2411475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2412475f6387SJan Schmidt { 2413475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2414475f6387SJan Schmidt struct btrfs_device *dev; 2415475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2416475f6387SJan Schmidt int ret = 0; 2417475f6387SJan Schmidt char *s_uuid = NULL; 2418475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2419475f6387SJan Schmidt 2420475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2421475f6387SJan Schmidt return -EPERM; 2422475f6387SJan Schmidt 2423475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2424475f6387SJan Schmidt if (IS_ERR(di_args)) 2425475f6387SJan Schmidt return PTR_ERR(di_args); 2426475f6387SJan Schmidt 2427475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2428475f6387SJan Schmidt s_uuid = di_args->uuid; 2429475f6387SJan Schmidt 2430475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2431aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2432475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2433475f6387SJan Schmidt 2434475f6387SJan Schmidt if (!dev) { 2435475f6387SJan Schmidt ret = -ENODEV; 2436475f6387SJan Schmidt goto out; 2437475f6387SJan Schmidt } 2438475f6387SJan Schmidt 2439475f6387SJan Schmidt di_args->devid = dev->devid; 2440475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2441475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2442475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2443a27202fbSJim Meyering if (dev->name) { 2444606686eeSJosef Bacik struct rcu_string *name; 2445606686eeSJosef Bacik 2446606686eeSJosef Bacik rcu_read_lock(); 2447606686eeSJosef Bacik name = rcu_dereference(dev->name); 2448606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2449606686eeSJosef Bacik rcu_read_unlock(); 2450a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2451a27202fbSJim Meyering } else { 245299ba55adSStefan Behrens di_args->path[0] = '\0'; 2453a27202fbSJim Meyering } 2454475f6387SJan Schmidt 2455475f6387SJan Schmidt out: 2456475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2457475f6387SJan Schmidt ret = -EFAULT; 2458475f6387SJan Schmidt 2459475f6387SJan Schmidt kfree(di_args); 2460475f6387SJan Schmidt return ret; 2461475f6387SJan Schmidt } 2462475f6387SJan Schmidt 246376dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2464b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2465f46b5a66SChristoph Hellwig { 2466f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2467f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 24682903ff01SAl Viro struct fd src_file; 2469f46b5a66SChristoph Hellwig struct inode *src; 2470f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2471f46b5a66SChristoph Hellwig struct btrfs_path *path; 2472f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2473ae01a0abSYan Zheng char *buf; 2474ae01a0abSYan Zheng struct btrfs_key key; 2475f46b5a66SChristoph Hellwig u32 nritems; 2476f46b5a66SChristoph Hellwig int slot; 2477ae01a0abSYan Zheng int ret; 2478c5c9cd4dSSage Weil u64 len = olen; 2479c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2480d20f7043SChris Mason 2481c5c9cd4dSSage Weil /* 2482c5c9cd4dSSage Weil * TODO: 2483c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2484c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2485c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2486c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2487c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2488c5c9cd4dSSage Weil * they don't overlap)? 2489c5c9cd4dSSage Weil */ 2490c5c9cd4dSSage Weil 2491e441d54dSChris Mason /* the destination must be opened for writing */ 24922ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2493e441d54dSChris Mason return -EINVAL; 2494e441d54dSChris Mason 2495b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2496b83cc969SLi Zefan return -EROFS; 2497b83cc969SLi Zefan 2498a561be71SAl Viro ret = mnt_want_write_file(file); 2499c146afadSYan Zheng if (ret) 2500c146afadSYan Zheng return ret; 2501c146afadSYan Zheng 25022903ff01SAl Viro src_file = fdget(srcfd); 25032903ff01SAl Viro if (!src_file.file) { 2504ab67b7c1SYan Zheng ret = -EBADF; 2505ab67b7c1SYan Zheng goto out_drop_write; 2506ab67b7c1SYan Zheng } 25075dc64164SDan Rosenberg 2508362a20c5SDavid Sterba ret = -EXDEV; 25092903ff01SAl Viro if (src_file.file->f_path.mnt != file->f_path.mnt) 2510362a20c5SDavid Sterba goto out_fput; 2511362a20c5SDavid Sterba 25122903ff01SAl Viro src = src_file.file->f_dentry->d_inode; 2513f46b5a66SChristoph Hellwig 2514c5c9cd4dSSage Weil ret = -EINVAL; 2515c5c9cd4dSSage Weil if (src == inode) 2516c5c9cd4dSSage Weil goto out_fput; 2517c5c9cd4dSSage Weil 25185dc64164SDan Rosenberg /* the src must be open for reading */ 25192903ff01SAl Viro if (!(src_file.file->f_mode & FMODE_READ)) 25205dc64164SDan Rosenberg goto out_fput; 25215dc64164SDan Rosenberg 25220e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 25230e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 25240e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 25250e7b824cSLi Zefan goto out_fput; 25260e7b824cSLi Zefan 2527ae01a0abSYan Zheng ret = -EISDIR; 2528ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2529f46b5a66SChristoph Hellwig goto out_fput; 2530f46b5a66SChristoph Hellwig 2531ae01a0abSYan Zheng ret = -EXDEV; 2532362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2533ae01a0abSYan Zheng goto out_fput; 2534ae01a0abSYan Zheng 2535ae01a0abSYan Zheng ret = -ENOMEM; 2536ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2537ae01a0abSYan Zheng if (!buf) 2538ae01a0abSYan Zheng goto out_fput; 2539ae01a0abSYan Zheng 2540ae01a0abSYan Zheng path = btrfs_alloc_path(); 2541ae01a0abSYan Zheng if (!path) { 2542ae01a0abSYan Zheng vfree(buf); 2543ae01a0abSYan Zheng goto out_fput; 2544ae01a0abSYan Zheng } 2545ae01a0abSYan Zheng path->reada = 2; 2546ae01a0abSYan Zheng 2547f46b5a66SChristoph Hellwig if (inode < src) { 2548fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2549fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2550f46b5a66SChristoph Hellwig } else { 2551fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2552fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2553f46b5a66SChristoph Hellwig } 2554f46b5a66SChristoph Hellwig 2555c5c9cd4dSSage Weil /* determine range to clone */ 2556c5c9cd4dSSage Weil ret = -EINVAL; 25572ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2558f46b5a66SChristoph Hellwig goto out_unlock; 2559c5c9cd4dSSage Weil if (len == 0) 2560c5c9cd4dSSage Weil olen = len = src->i_size - off; 2561c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2562c5c9cd4dSSage Weil if (off + len == src->i_size) 25632a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2564c5c9cd4dSSage Weil 2565c5c9cd4dSSage Weil /* verify the end result is block aligned */ 25662a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 25672a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2568c5c9cd4dSSage Weil goto out_unlock; 2569c5c9cd4dSSage Weil 2570d525e8abSLi Zefan if (destoff > inode->i_size) { 2571d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2572d525e8abSLi Zefan if (ret) 2573d525e8abSLi Zefan goto out_unlock; 2574d525e8abSLi Zefan } 2575d525e8abSLi Zefan 257671ef0786SLi Zefan /* truncate page cache pages from target inode range */ 257771ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 257871ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 257971ef0786SLi Zefan 2580f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2581f46b5a66SChristoph Hellwig another, and lock file content */ 2582f46b5a66SChristoph Hellwig while (1) { 258331840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2584aa42ffd9SLiu Bo lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2585aa42ffd9SLiu Bo ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); 25869a019196SSage Weil if (!ordered && 2587aa42ffd9SLiu Bo !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, 25889a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2589f46b5a66SChristoph Hellwig break; 2590aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2591ae01a0abSYan Zheng if (ordered) 2592ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 25939a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2594f46b5a66SChristoph Hellwig } 2595f46b5a66SChristoph Hellwig 2596c5c9cd4dSSage Weil /* clone data */ 259733345d01SLi Zefan key.objectid = btrfs_ino(src); 2598ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2599ae01a0abSYan Zheng key.offset = 0; 2600f46b5a66SChristoph Hellwig 2601f46b5a66SChristoph Hellwig while (1) { 2602f46b5a66SChristoph Hellwig /* 2603f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2604f46b5a66SChristoph Hellwig * tree. 2605f46b5a66SChristoph Hellwig */ 2606362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2607362a20c5SDavid Sterba 0, 0); 2608f46b5a66SChristoph Hellwig if (ret < 0) 2609f46b5a66SChristoph Hellwig goto out; 2610f46b5a66SChristoph Hellwig 2611ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2612ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2613362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2614f46b5a66SChristoph Hellwig if (ret < 0) 2615f46b5a66SChristoph Hellwig goto out; 2616f46b5a66SChristoph Hellwig if (ret > 0) 2617f46b5a66SChristoph Hellwig break; 2618ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2619f46b5a66SChristoph Hellwig } 2620f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2621f46b5a66SChristoph Hellwig slot = path->slots[0]; 2622f46b5a66SChristoph Hellwig 2623ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2624d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 262533345d01SLi Zefan key.objectid != btrfs_ino(src)) 2626f46b5a66SChristoph Hellwig break; 2627f46b5a66SChristoph Hellwig 2628c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2629c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2630c5c9cd4dSSage Weil int type; 263131840ae1SZheng Yan u32 size; 263231840ae1SZheng Yan struct btrfs_key new_key; 2633c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2634c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2635c5c9cd4dSSage Weil u8 comp; 2636b5384d48SSage Weil u64 endoff; 263731840ae1SZheng Yan 263831840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 263931840ae1SZheng Yan read_extent_buffer(leaf, buf, 264031840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 264131840ae1SZheng Yan size); 2642c5c9cd4dSSage Weil 2643c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2644c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2645c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2646c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2647c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2648c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2649d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2650d397712bSChris Mason extent); 2651d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2652d397712bSChris Mason extent); 2653c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2654d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2655d397712bSChris Mason extent); 2656c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2657c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2658c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2659c5c9cd4dSSage Weil extent); 2660c5c9cd4dSSage Weil } 2661b3b4aa74SDavid Sterba btrfs_release_path(path); 266231840ae1SZheng Yan 2663050006a7SSage Weil if (key.offset + datal <= off || 2664aa42ffd9SLiu Bo key.offset >= off + len - 1) 2665c5c9cd4dSSage Weil goto next; 2666c5c9cd4dSSage Weil 266731840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 266833345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 26694d728ec7SLi Zefan if (off <= key.offset) 2670c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 26714d728ec7SLi Zefan else 26724d728ec7SLi Zefan new_key.offset = destoff; 2673c5c9cd4dSSage Weil 2674b6f3409bSSage Weil /* 2675b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2676b6f3409bSSage Weil * 1 - add new extent 2677b6f3409bSSage Weil * 1 - inode update 2678b6f3409bSSage Weil */ 2679b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2680a22285a6SYan, Zheng if (IS_ERR(trans)) { 2681a22285a6SYan, Zheng ret = PTR_ERR(trans); 2682a22285a6SYan, Zheng goto out; 2683a22285a6SYan, Zheng } 2684a22285a6SYan, Zheng 2685c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2686c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2687d72c0842SLi Zefan /* 2688d72c0842SLi Zefan * a | --- range to clone ---| b 2689d72c0842SLi Zefan * | ------------- extent ------------- | 2690d72c0842SLi Zefan */ 2691d72c0842SLi Zefan 2692d72c0842SLi Zefan /* substract range b */ 2693d72c0842SLi Zefan if (key.offset + datal > off + len) 2694d72c0842SLi Zefan datal = off + len - key.offset; 2695d72c0842SLi Zefan 2696d72c0842SLi Zefan /* substract range a */ 2697a22285a6SYan, Zheng if (off > key.offset) { 2698a22285a6SYan, Zheng datao += off - key.offset; 2699a22285a6SYan, Zheng datal -= off - key.offset; 2700a22285a6SYan, Zheng } 2701a22285a6SYan, Zheng 27025dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2703a22285a6SYan, Zheng new_key.offset, 2704a22285a6SYan, Zheng new_key.offset + datal, 27052671485dSJosef Bacik 1); 270679787eaaSJeff Mahoney if (ret) { 270779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 270879787eaaSJeff Mahoney ret); 270979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 271079787eaaSJeff Mahoney goto out; 271179787eaaSJeff Mahoney } 2712a22285a6SYan, Zheng 271331840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 271431840ae1SZheng Yan &new_key, size); 271579787eaaSJeff Mahoney if (ret) { 271679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 271779787eaaSJeff Mahoney ret); 271879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 271979787eaaSJeff Mahoney goto out; 272079787eaaSJeff Mahoney } 272131840ae1SZheng Yan 272231840ae1SZheng Yan leaf = path->nodes[0]; 272331840ae1SZheng Yan slot = path->slots[0]; 272431840ae1SZheng Yan write_extent_buffer(leaf, buf, 272531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 272631840ae1SZheng Yan size); 2727ae01a0abSYan Zheng 2728f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2729f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2730c5c9cd4dSSage Weil 2731c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2732c5c9cd4dSSage Weil if (!disko) 2733c5c9cd4dSSage Weil datao = 0; 2734c5c9cd4dSSage Weil 2735c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2736c5c9cd4dSSage Weil datao); 2737c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2738c5c9cd4dSSage Weil datal); 2739c5c9cd4dSSage Weil if (disko) { 2740c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2741ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 27425d4f98a2SYan Zheng disko, diskl, 0, 2743f46b5a66SChristoph Hellwig root->root_key.objectid, 274433345d01SLi Zefan btrfs_ino(inode), 274566d7e7f0SArne Jansen new_key.offset - datao, 274666d7e7f0SArne Jansen 0); 274779787eaaSJeff Mahoney if (ret) { 274879787eaaSJeff Mahoney btrfs_abort_transaction(trans, 274979787eaaSJeff Mahoney root, 275079787eaaSJeff Mahoney ret); 275179787eaaSJeff Mahoney btrfs_end_transaction(trans, 275279787eaaSJeff Mahoney root); 275379787eaaSJeff Mahoney goto out; 275479787eaaSJeff Mahoney 275579787eaaSJeff Mahoney } 2756f46b5a66SChristoph Hellwig } 2757c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2758c5c9cd4dSSage Weil u64 skip = 0; 2759c5c9cd4dSSage Weil u64 trim = 0; 2760c5c9cd4dSSage Weil if (off > key.offset) { 2761c5c9cd4dSSage Weil skip = off - key.offset; 2762c5c9cd4dSSage Weil new_key.offset += skip; 276331840ae1SZheng Yan } 2764d397712bSChris Mason 2765c5c9cd4dSSage Weil if (key.offset + datal > off + len) 2766c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 2767d397712bSChris Mason 2768c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2769c5c9cd4dSSage Weil ret = -EINVAL; 2770a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2771c5c9cd4dSSage Weil goto out; 277231840ae1SZheng Yan } 2773c5c9cd4dSSage Weil size -= skip + trim; 2774c5c9cd4dSSage Weil datal -= skip + trim; 2775a22285a6SYan, Zheng 27765dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2777a22285a6SYan, Zheng new_key.offset, 2778a22285a6SYan, Zheng new_key.offset + datal, 27792671485dSJosef Bacik 1); 278079787eaaSJeff Mahoney if (ret) { 278179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 278279787eaaSJeff Mahoney ret); 278379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 278479787eaaSJeff Mahoney goto out; 278579787eaaSJeff Mahoney } 2786a22285a6SYan, Zheng 2787c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2788c5c9cd4dSSage Weil &new_key, size); 278979787eaaSJeff Mahoney if (ret) { 279079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 279179787eaaSJeff Mahoney ret); 279279787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 279379787eaaSJeff Mahoney goto out; 279479787eaaSJeff Mahoney } 2795c5c9cd4dSSage Weil 2796c5c9cd4dSSage Weil if (skip) { 2797d397712bSChris Mason u32 start = 2798d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2799c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2800c5c9cd4dSSage Weil datal); 2801c5c9cd4dSSage Weil } 2802c5c9cd4dSSage Weil 2803c5c9cd4dSSage Weil leaf = path->nodes[0]; 2804c5c9cd4dSSage Weil slot = path->slots[0]; 2805c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2806c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2807c5c9cd4dSSage Weil size); 2808c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2809c5c9cd4dSSage Weil } 2810c5c9cd4dSSage Weil 2811c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2812b3b4aa74SDavid Sterba btrfs_release_path(path); 2813c5c9cd4dSSage Weil 28140c4d2d95SJosef Bacik inode_inc_iversion(inode); 2815a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2816b5384d48SSage Weil 2817b5384d48SSage Weil /* 2818b5384d48SSage Weil * we round up to the block size at eof when 2819b5384d48SSage Weil * determining which extents to clone above, 2820b5384d48SSage Weil * but shouldn't round up the file size 2821b5384d48SSage Weil */ 2822b5384d48SSage Weil endoff = new_key.offset + datal; 28235f3888ffSLi Zefan if (endoff > destoff+olen) 28245f3888ffSLi Zefan endoff = destoff+olen; 2825b5384d48SSage Weil if (endoff > inode->i_size) 2826b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2827b5384d48SSage Weil 2828a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 282979787eaaSJeff Mahoney if (ret) { 283079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2831a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 283279787eaaSJeff Mahoney goto out; 283379787eaaSJeff Mahoney } 283479787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2835a22285a6SYan, Zheng } 2836c5c9cd4dSSage Weil next: 2837b3b4aa74SDavid Sterba btrfs_release_path(path); 2838ae01a0abSYan Zheng key.offset++; 2839ae01a0abSYan Zheng } 2840f46b5a66SChristoph Hellwig ret = 0; 2841f46b5a66SChristoph Hellwig out: 2842b3b4aa74SDavid Sterba btrfs_release_path(path); 2843aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2844f46b5a66SChristoph Hellwig out_unlock: 2845f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2846f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2847ae01a0abSYan Zheng vfree(buf); 2848ae01a0abSYan Zheng btrfs_free_path(path); 2849f46b5a66SChristoph Hellwig out_fput: 28502903ff01SAl Viro fdput(src_file); 2851ab67b7c1SYan Zheng out_drop_write: 28522a79f17eSAl Viro mnt_drop_write_file(file); 2853f46b5a66SChristoph Hellwig return ret; 2854f46b5a66SChristoph Hellwig } 2855f46b5a66SChristoph Hellwig 28567a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2857c5c9cd4dSSage Weil { 2858c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2859c5c9cd4dSSage Weil 28607a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2861c5c9cd4dSSage Weil return -EFAULT; 2862c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2863c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2864c5c9cd4dSSage Weil } 2865c5c9cd4dSSage Weil 2866f46b5a66SChristoph Hellwig /* 2867f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2868f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2869f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2870f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2871f46b5a66SChristoph Hellwig */ 2872b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2873f46b5a66SChristoph Hellwig { 2874f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2875f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2876f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 28771ab86aedSSage Weil int ret; 2878f46b5a66SChristoph Hellwig 28791ab86aedSSage Weil ret = -EPERM; 2880df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2881f46b5a66SChristoph Hellwig goto out; 28821ab86aedSSage Weil 28831ab86aedSSage Weil ret = -EINPROGRESS; 28841ab86aedSSage Weil if (file->private_data) 28851ab86aedSSage Weil goto out; 28869ca9ee09SSage Weil 2887b83cc969SLi Zefan ret = -EROFS; 2888b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2889b83cc969SLi Zefan goto out; 2890b83cc969SLi Zefan 2891a561be71SAl Viro ret = mnt_want_write_file(file); 2892c146afadSYan Zheng if (ret) 2893c146afadSYan Zheng goto out; 2894c146afadSYan Zheng 2895a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 28969ca9ee09SSage Weil 2897f46b5a66SChristoph Hellwig ret = -ENOMEM; 28987a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2899abd30bb0STsutomu Itoh if (IS_ERR(trans)) 29001ab86aedSSage Weil goto out_drop; 29011ab86aedSSage Weil 29021ab86aedSSage Weil file->private_data = trans; 29031ab86aedSSage Weil return 0; 29041ab86aedSSage Weil 29051ab86aedSSage Weil out_drop: 2906a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29072a79f17eSAl Viro mnt_drop_write_file(file); 2908f46b5a66SChristoph Hellwig out: 2909f46b5a66SChristoph Hellwig return ret; 2910f46b5a66SChristoph Hellwig } 2911f46b5a66SChristoph Hellwig 29126ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 29136ef5ed0dSJosef Bacik { 29146ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 29156ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 29166ef5ed0dSJosef Bacik struct btrfs_root *new_root; 29176ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 29186ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 29196ef5ed0dSJosef Bacik struct btrfs_path *path; 29206ef5ed0dSJosef Bacik struct btrfs_key location; 29216ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 29226ef5ed0dSJosef Bacik u64 objectid = 0; 29236ef5ed0dSJosef Bacik u64 dir_id; 29243c04ce01SMiao Xie int ret; 29256ef5ed0dSJosef Bacik 29266ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 29276ef5ed0dSJosef Bacik return -EPERM; 29286ef5ed0dSJosef Bacik 29293c04ce01SMiao Xie ret = mnt_want_write_file(file); 29303c04ce01SMiao Xie if (ret) 29313c04ce01SMiao Xie return ret; 29323c04ce01SMiao Xie 29333c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29343c04ce01SMiao Xie ret = -EFAULT; 29353c04ce01SMiao Xie goto out; 29363c04ce01SMiao Xie } 29376ef5ed0dSJosef Bacik 29386ef5ed0dSJosef Bacik if (!objectid) 29396ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 29406ef5ed0dSJosef Bacik 29416ef5ed0dSJosef Bacik location.objectid = objectid; 29426ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 29436ef5ed0dSJosef Bacik location.offset = (u64)-1; 29446ef5ed0dSJosef Bacik 29456ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 29463c04ce01SMiao Xie if (IS_ERR(new_root)) { 29473c04ce01SMiao Xie ret = PTR_ERR(new_root); 29483c04ce01SMiao Xie goto out; 29493c04ce01SMiao Xie } 29506ef5ed0dSJosef Bacik 29513c04ce01SMiao Xie if (btrfs_root_refs(&new_root->root_item) == 0) { 29523c04ce01SMiao Xie ret = -ENOENT; 29533c04ce01SMiao Xie goto out; 29543c04ce01SMiao Xie } 29556ef5ed0dSJosef Bacik 29566ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29573c04ce01SMiao Xie if (!path) { 29583c04ce01SMiao Xie ret = -ENOMEM; 29593c04ce01SMiao Xie goto out; 29603c04ce01SMiao Xie } 29616ef5ed0dSJosef Bacik path->leave_spinning = 1; 29626ef5ed0dSJosef Bacik 29636ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 296498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29656ef5ed0dSJosef Bacik btrfs_free_path(path); 29663c04ce01SMiao Xie ret = PTR_ERR(trans); 29673c04ce01SMiao Xie goto out; 29686ef5ed0dSJosef Bacik } 29696ef5ed0dSJosef Bacik 29706c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 29716ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 29726ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2973cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29746ef5ed0dSJosef Bacik btrfs_free_path(path); 29756ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29766ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 29776ef5ed0dSJosef Bacik "this isn't going to work\n"); 29783c04ce01SMiao Xie ret = -ENOENT; 29793c04ce01SMiao Xie goto out; 29806ef5ed0dSJosef Bacik } 29816ef5ed0dSJosef Bacik 29826ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29836ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29846ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29856ef5ed0dSJosef Bacik btrfs_free_path(path); 29866ef5ed0dSJosef Bacik 29872b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 29886ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 29893c04ce01SMiao Xie out: 29903c04ce01SMiao Xie mnt_drop_write_file(file); 29913c04ce01SMiao Xie return ret; 29926ef5ed0dSJosef Bacik } 29936ef5ed0dSJosef Bacik 29945af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 2995bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2996bf5fc093SJosef Bacik { 2997bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2998bf5fc093SJosef Bacik 2999bf5fc093SJosef Bacik space->total_bytes = 0; 3000bf5fc093SJosef Bacik space->used_bytes = 0; 3001bf5fc093SJosef Bacik space->flags = 0; 3002bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3003bf5fc093SJosef Bacik space->flags = block_group->flags; 3004bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3005bf5fc093SJosef Bacik space->used_bytes += 3006bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3007bf5fc093SJosef Bacik } 3008bf5fc093SJosef Bacik } 3009bf5fc093SJosef Bacik 30101406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 30111406e432SJosef Bacik { 30121406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 30131406e432SJosef Bacik struct btrfs_ioctl_space_info space; 30141406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 30157fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 301613f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 30171406e432SJosef Bacik struct btrfs_space_info *info; 3018bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3019bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3020bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3021bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3022bf5fc093SJosef Bacik int num_types = 4; 30237fde62bfSChris Mason int alloc_size; 30241406e432SJosef Bacik int ret = 0; 302551788b1bSDan Rosenberg u64 slot_count = 0; 3026bf5fc093SJosef Bacik int i, c; 30271406e432SJosef Bacik 30281406e432SJosef Bacik if (copy_from_user(&space_args, 30291406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 30301406e432SJosef Bacik sizeof(space_args))) 30311406e432SJosef Bacik return -EFAULT; 30321406e432SJosef Bacik 3033bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3034bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3035bf5fc093SJosef Bacik 3036bf5fc093SJosef Bacik info = NULL; 30377fde62bfSChris Mason rcu_read_lock(); 3038bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3039bf5fc093SJosef Bacik list) { 3040bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3041bf5fc093SJosef Bacik info = tmp; 3042bf5fc093SJosef Bacik break; 3043bf5fc093SJosef Bacik } 3044bf5fc093SJosef Bacik } 30457fde62bfSChris Mason rcu_read_unlock(); 30461406e432SJosef Bacik 3047bf5fc093SJosef Bacik if (!info) 3048bf5fc093SJosef Bacik continue; 3049bf5fc093SJosef Bacik 3050bf5fc093SJosef Bacik down_read(&info->groups_sem); 3051bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3052bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3053bf5fc093SJosef Bacik slot_count++; 3054bf5fc093SJosef Bacik } 3055bf5fc093SJosef Bacik up_read(&info->groups_sem); 3056bf5fc093SJosef Bacik } 3057bf5fc093SJosef Bacik 30587fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30597fde62bfSChris Mason if (space_args.space_slots == 0) { 30607fde62bfSChris Mason space_args.total_spaces = slot_count; 30617fde62bfSChris Mason goto out; 30627fde62bfSChris Mason } 3063bf5fc093SJosef Bacik 306451788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3065bf5fc093SJosef Bacik 30667fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3067bf5fc093SJosef Bacik 30687fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30697fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30707fde62bfSChris Mason */ 30717fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 30727fde62bfSChris Mason return -ENOMEM; 30737fde62bfSChris Mason 30747fde62bfSChris Mason space_args.total_spaces = 0; 30757fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 30767fde62bfSChris Mason if (!dest) 30777fde62bfSChris Mason return -ENOMEM; 30787fde62bfSChris Mason dest_orig = dest; 30797fde62bfSChris Mason 30807fde62bfSChris Mason /* now we have a buffer to copy into */ 3081bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3082bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3083bf5fc093SJosef Bacik 308451788b1bSDan Rosenberg if (!slot_count) 308551788b1bSDan Rosenberg break; 308651788b1bSDan Rosenberg 3087bf5fc093SJosef Bacik info = NULL; 30881406e432SJosef Bacik rcu_read_lock(); 3089bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3090bf5fc093SJosef Bacik list) { 3091bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3092bf5fc093SJosef Bacik info = tmp; 30937fde62bfSChris Mason break; 3094bf5fc093SJosef Bacik } 3095bf5fc093SJosef Bacik } 3096bf5fc093SJosef Bacik rcu_read_unlock(); 30977fde62bfSChris Mason 3098bf5fc093SJosef Bacik if (!info) 3099bf5fc093SJosef Bacik continue; 3100bf5fc093SJosef Bacik down_read(&info->groups_sem); 3101bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3102bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 31035af3e8ccSStefan Behrens btrfs_get_block_group_info( 31045af3e8ccSStefan Behrens &info->block_groups[c], &space); 31057fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 31061406e432SJosef Bacik dest++; 31071406e432SJosef Bacik space_args.total_spaces++; 310851788b1bSDan Rosenberg slot_count--; 31091406e432SJosef Bacik } 311051788b1bSDan Rosenberg if (!slot_count) 311151788b1bSDan Rosenberg break; 3112bf5fc093SJosef Bacik } 3113bf5fc093SJosef Bacik up_read(&info->groups_sem); 3114bf5fc093SJosef Bacik } 31151406e432SJosef Bacik 31162eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 31177fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 31187fde62bfSChris Mason 31197fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 31207fde62bfSChris Mason ret = -EFAULT; 31217fde62bfSChris Mason 31227fde62bfSChris Mason kfree(dest_orig); 31237fde62bfSChris Mason out: 31247fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31251406e432SJosef Bacik ret = -EFAULT; 31261406e432SJosef Bacik 31271406e432SJosef Bacik return ret; 31281406e432SJosef Bacik } 31291406e432SJosef Bacik 3130f46b5a66SChristoph Hellwig /* 3131f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3132f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3133f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3134f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3135f46b5a66SChristoph Hellwig */ 3136f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3137f46b5a66SChristoph Hellwig { 3138f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 3139f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3140f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3141f46b5a66SChristoph Hellwig 3142f46b5a66SChristoph Hellwig trans = file->private_data; 31431ab86aedSSage Weil if (!trans) 31441ab86aedSSage Weil return -EINVAL; 3145b214107eSChristoph Hellwig file->private_data = NULL; 31469ca9ee09SSage Weil 31471ab86aedSSage Weil btrfs_end_transaction(trans, root); 31481ab86aedSSage Weil 3149a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 31509ca9ee09SSage Weil 31512a79f17eSAl Viro mnt_drop_write_file(file); 31521ab86aedSSage Weil return 0; 3153f46b5a66SChristoph Hellwig } 3154f46b5a66SChristoph Hellwig 31559a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31569a8c28beSMiao Xie void __user *argp) 315746204592SSage Weil { 315846204592SSage Weil struct btrfs_trans_handle *trans; 315946204592SSage Weil u64 transid; 3160db5b493aSTsutomu Itoh int ret; 316146204592SSage Weil 3162d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3163ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3164ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 316598d5dc13STsutomu Itoh return PTR_ERR(trans); 3166ff7c1d33SMiao Xie 3167ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3168ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3169ff7c1d33SMiao Xie goto out; 3170ff7c1d33SMiao Xie } 317146204592SSage Weil transid = trans->transid; 3172db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 31738b2b2d3cSTsutomu Itoh if (ret) { 31748b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3175db5b493aSTsutomu Itoh return ret; 31768b2b2d3cSTsutomu Itoh } 3177ff7c1d33SMiao Xie out: 317846204592SSage Weil if (argp) 317946204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 318046204592SSage Weil return -EFAULT; 318146204592SSage Weil return 0; 318246204592SSage Weil } 318346204592SSage Weil 31849a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 31859a8c28beSMiao Xie void __user *argp) 318646204592SSage Weil { 318746204592SSage Weil u64 transid; 318846204592SSage Weil 318946204592SSage Weil if (argp) { 319046204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 319146204592SSage Weil return -EFAULT; 319246204592SSage Weil } else { 319346204592SSage Weil transid = 0; /* current trans */ 319446204592SSage Weil } 319546204592SSage Weil return btrfs_wait_for_commit(root, transid); 319646204592SSage Weil } 319746204592SSage Weil 3198b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3199475f6387SJan Schmidt { 3200b8e95489SMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3201475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3202b8e95489SMiao Xie int ret; 3203475f6387SJan Schmidt 3204475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3205475f6387SJan Schmidt return -EPERM; 3206475f6387SJan Schmidt 3207475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3208475f6387SJan Schmidt if (IS_ERR(sa)) 3209475f6387SJan Schmidt return PTR_ERR(sa); 3210475f6387SJan Schmidt 3211b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3212b8e95489SMiao Xie ret = mnt_want_write_file(file); 3213b8e95489SMiao Xie if (ret) 3214b8e95489SMiao Xie goto out; 3215b8e95489SMiao Xie } 3216b8e95489SMiao Xie 3217aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 321863a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 321963a212abSStefan Behrens 0); 3220475f6387SJan Schmidt 3221475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3222475f6387SJan Schmidt ret = -EFAULT; 3223475f6387SJan Schmidt 3224b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3225b8e95489SMiao Xie mnt_drop_write_file(file); 3226b8e95489SMiao Xie out: 3227475f6387SJan Schmidt kfree(sa); 3228475f6387SJan Schmidt return ret; 3229475f6387SJan Schmidt } 3230475f6387SJan Schmidt 3231475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3232475f6387SJan Schmidt { 3233475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3234475f6387SJan Schmidt return -EPERM; 3235475f6387SJan Schmidt 3236aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3237475f6387SJan Schmidt } 3238475f6387SJan Schmidt 3239475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3240475f6387SJan Schmidt void __user *arg) 3241475f6387SJan Schmidt { 3242475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3243475f6387SJan Schmidt int ret; 3244475f6387SJan Schmidt 3245475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3246475f6387SJan Schmidt return -EPERM; 3247475f6387SJan Schmidt 3248475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3249475f6387SJan Schmidt if (IS_ERR(sa)) 3250475f6387SJan Schmidt return PTR_ERR(sa); 3251475f6387SJan Schmidt 3252475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3253475f6387SJan Schmidt 3254475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3255475f6387SJan Schmidt ret = -EFAULT; 3256475f6387SJan Schmidt 3257475f6387SJan Schmidt kfree(sa); 3258475f6387SJan Schmidt return ret; 3259475f6387SJan Schmidt } 3260475f6387SJan Schmidt 3261c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3262b27f7c0cSDavid Sterba void __user *arg) 3263c11d2c23SStefan Behrens { 3264c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3265c11d2c23SStefan Behrens int ret; 3266c11d2c23SStefan Behrens 3267c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3268c11d2c23SStefan Behrens if (IS_ERR(sa)) 3269c11d2c23SStefan Behrens return PTR_ERR(sa); 3270c11d2c23SStefan Behrens 3271b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3272b27f7c0cSDavid Sterba kfree(sa); 3273b27f7c0cSDavid Sterba return -EPERM; 3274b27f7c0cSDavid Sterba } 3275b27f7c0cSDavid Sterba 3276b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3277c11d2c23SStefan Behrens 3278c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3279c11d2c23SStefan Behrens ret = -EFAULT; 3280c11d2c23SStefan Behrens 3281c11d2c23SStefan Behrens kfree(sa); 3282c11d2c23SStefan Behrens return ret; 3283c11d2c23SStefan Behrens } 3284c11d2c23SStefan Behrens 32853f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 32863f6bcfbdSStefan Behrens { 32873f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32883f6bcfbdSStefan Behrens int ret; 32893f6bcfbdSStefan Behrens 32903f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32913f6bcfbdSStefan Behrens return -EPERM; 32923f6bcfbdSStefan Behrens 32933f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32943f6bcfbdSStefan Behrens if (IS_ERR(p)) 32953f6bcfbdSStefan Behrens return PTR_ERR(p); 32963f6bcfbdSStefan Behrens 32973f6bcfbdSStefan Behrens switch (p->cmd) { 32983f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 32993f6bcfbdSStefan Behrens if (atomic_xchg( 33003f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33013f6bcfbdSStefan Behrens 1)) { 33023f6bcfbdSStefan Behrens pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 33033f6bcfbdSStefan Behrens ret = -EINPROGRESS; 33043f6bcfbdSStefan Behrens } else { 33053f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 33063f6bcfbdSStefan Behrens atomic_set( 33073f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 33083f6bcfbdSStefan Behrens 0); 33093f6bcfbdSStefan Behrens } 33103f6bcfbdSStefan Behrens break; 33113f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 33123f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 33133f6bcfbdSStefan Behrens ret = 0; 33143f6bcfbdSStefan Behrens break; 33153f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 33163f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 33173f6bcfbdSStefan Behrens break; 33183f6bcfbdSStefan Behrens default: 33193f6bcfbdSStefan Behrens ret = -EINVAL; 33203f6bcfbdSStefan Behrens break; 33213f6bcfbdSStefan Behrens } 33223f6bcfbdSStefan Behrens 33233f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 33243f6bcfbdSStefan Behrens ret = -EFAULT; 33253f6bcfbdSStefan Behrens 33263f6bcfbdSStefan Behrens kfree(p); 33273f6bcfbdSStefan Behrens return ret; 33283f6bcfbdSStefan Behrens } 33293f6bcfbdSStefan Behrens 3330d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3331d7728c96SJan Schmidt { 3332d7728c96SJan Schmidt int ret = 0; 3333d7728c96SJan Schmidt int i; 3334740c3d22SChris Mason u64 rel_ptr; 3335d7728c96SJan Schmidt int size; 3336806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3337d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3338d7728c96SJan Schmidt struct btrfs_path *path; 3339d7728c96SJan Schmidt 334082b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3341d7728c96SJan Schmidt return -EPERM; 3342d7728c96SJan Schmidt 3343d7728c96SJan Schmidt path = btrfs_alloc_path(); 3344d7728c96SJan Schmidt if (!path) { 3345d7728c96SJan Schmidt ret = -ENOMEM; 3346d7728c96SJan Schmidt goto out; 3347d7728c96SJan Schmidt } 3348d7728c96SJan Schmidt 3349d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3350d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3351d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3352d7728c96SJan Schmidt ipa = NULL; 3353d7728c96SJan Schmidt goto out; 3354d7728c96SJan Schmidt } 3355d7728c96SJan Schmidt 3356d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3357d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3358d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3359d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3360d7728c96SJan Schmidt ipath = NULL; 3361d7728c96SJan Schmidt goto out; 3362d7728c96SJan Schmidt } 3363d7728c96SJan Schmidt 3364d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3365d7728c96SJan Schmidt if (ret < 0) 3366d7728c96SJan Schmidt goto out; 3367d7728c96SJan Schmidt 3368d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3369745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3370745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3371740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3372d7728c96SJan Schmidt } 3373d7728c96SJan Schmidt 3374745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3375745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3376d7728c96SJan Schmidt if (ret) { 3377d7728c96SJan Schmidt ret = -EFAULT; 3378d7728c96SJan Schmidt goto out; 3379d7728c96SJan Schmidt } 3380d7728c96SJan Schmidt 3381d7728c96SJan Schmidt out: 3382d7728c96SJan Schmidt btrfs_free_path(path); 3383d7728c96SJan Schmidt free_ipath(ipath); 3384d7728c96SJan Schmidt kfree(ipa); 3385d7728c96SJan Schmidt 3386d7728c96SJan Schmidt return ret; 3387d7728c96SJan Schmidt } 3388d7728c96SJan Schmidt 3389d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3390d7728c96SJan Schmidt { 3391d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3392d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3393d7728c96SJan Schmidt 3394d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3395d7728c96SJan Schmidt inodes->bytes_left -= c; 3396d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3397d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3398d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3399d7728c96SJan Schmidt inodes->elem_cnt += 3; 3400d7728c96SJan Schmidt } else { 3401d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3402d7728c96SJan Schmidt inodes->bytes_left = 0; 3403d7728c96SJan Schmidt inodes->elem_missed += 3; 3404d7728c96SJan Schmidt } 3405d7728c96SJan Schmidt 3406d7728c96SJan Schmidt return 0; 3407d7728c96SJan Schmidt } 3408d7728c96SJan Schmidt 3409d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3410d7728c96SJan Schmidt void __user *arg) 3411d7728c96SJan Schmidt { 3412d7728c96SJan Schmidt int ret = 0; 3413d7728c96SJan Schmidt int size; 3414d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3415d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3416d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3417d7728c96SJan Schmidt 3418d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3419d7728c96SJan Schmidt return -EPERM; 3420d7728c96SJan Schmidt 3421d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3422d7728c96SJan Schmidt if (IS_ERR(loi)) { 3423d7728c96SJan Schmidt ret = PTR_ERR(loi); 3424d7728c96SJan Schmidt loi = NULL; 3425d7728c96SJan Schmidt goto out; 3426d7728c96SJan Schmidt } 3427d7728c96SJan Schmidt 3428d7728c96SJan Schmidt path = btrfs_alloc_path(); 3429d7728c96SJan Schmidt if (!path) { 3430d7728c96SJan Schmidt ret = -ENOMEM; 3431d7728c96SJan Schmidt goto out; 3432d7728c96SJan Schmidt } 3433d7728c96SJan Schmidt 3434425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3435d7728c96SJan Schmidt inodes = init_data_container(size); 3436d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3437d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3438d7728c96SJan Schmidt inodes = NULL; 3439d7728c96SJan Schmidt goto out; 3440d7728c96SJan Schmidt } 3441d7728c96SJan Schmidt 3442df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3443df031f07SLiu Bo build_ino_list, inodes); 3444df031f07SLiu Bo if (ret == -EINVAL) 3445d7728c96SJan Schmidt ret = -ENOENT; 3446d7728c96SJan Schmidt if (ret < 0) 3447d7728c96SJan Schmidt goto out; 3448d7728c96SJan Schmidt 3449745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3450745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3451d7728c96SJan Schmidt if (ret) 3452d7728c96SJan Schmidt ret = -EFAULT; 3453d7728c96SJan Schmidt 3454d7728c96SJan Schmidt out: 3455d7728c96SJan Schmidt btrfs_free_path(path); 3456425d17a2SLiu Bo vfree(inodes); 3457d7728c96SJan Schmidt kfree(loi); 3458d7728c96SJan Schmidt 3459d7728c96SJan Schmidt return ret; 3460d7728c96SJan Schmidt } 3461d7728c96SJan Schmidt 346219a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3463c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3464c9e9f97bSIlya Dryomov { 3465c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3466c9e9f97bSIlya Dryomov 3467c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3468c9e9f97bSIlya Dryomov 3469837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3470837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3471837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3472837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3473a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3474a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3475837d5b6eSIlya Dryomov 3476c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3477c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3478c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 347919a39dceSIlya Dryomov 348019a39dceSIlya Dryomov if (lock) { 348119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 348219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 348419a39dceSIlya Dryomov } else { 348519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348619a39dceSIlya Dryomov } 3487c9e9f97bSIlya Dryomov } 3488c9e9f97bSIlya Dryomov 34899ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3490c9e9f97bSIlya Dryomov { 34919ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3492c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3493c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3494c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3495ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3496c9e9f97bSIlya Dryomov int ret; 3497c9e9f97bSIlya Dryomov 3498c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3499c9e9f97bSIlya Dryomov return -EPERM; 3500c9e9f97bSIlya Dryomov 3501e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35029ba1f6e4SLiu Bo if (ret) 35039ba1f6e4SLiu Bo return ret; 35049ba1f6e4SLiu Bo 3505ed0fb78fSIlya Dryomov again: 3506ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3507c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3508c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3509ed0fb78fSIlya Dryomov need_unlock = true; 3510ed0fb78fSIlya Dryomov goto locked; 3511ed0fb78fSIlya Dryomov } 3512ed0fb78fSIlya Dryomov 3513ed0fb78fSIlya Dryomov /* 3514ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3515ed0fb78fSIlya Dryomov * (1) some other op is running 3516ed0fb78fSIlya Dryomov * (2) balance is running 3517ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3518ed0fb78fSIlya Dryomov */ 3519ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3520ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3521ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3522ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3523ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3524ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3525ed0fb78fSIlya Dryomov goto again; 3526ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3527ed0fb78fSIlya Dryomov 3528ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3529ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3530ed0fb78fSIlya Dryomov /* this is (3) */ 3531ed0fb78fSIlya Dryomov need_unlock = false; 3532ed0fb78fSIlya Dryomov goto locked; 3533ed0fb78fSIlya Dryomov } 3534ed0fb78fSIlya Dryomov 3535ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3536ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3537ed0fb78fSIlya Dryomov goto again; 3538ed0fb78fSIlya Dryomov } else { 3539ed0fb78fSIlya Dryomov /* this is (2) */ 3540ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3541ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3542ed0fb78fSIlya Dryomov goto out; 3543ed0fb78fSIlya Dryomov } 3544ed0fb78fSIlya Dryomov } else { 3545ed0fb78fSIlya Dryomov /* this is (1) */ 3546ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3547ed0fb78fSIlya Dryomov pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); 3548ed0fb78fSIlya Dryomov ret = -EINVAL; 3549ed0fb78fSIlya Dryomov goto out; 3550ed0fb78fSIlya Dryomov } 3551ed0fb78fSIlya Dryomov 3552ed0fb78fSIlya Dryomov locked: 3553ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3554c9e9f97bSIlya Dryomov 3555c9e9f97bSIlya Dryomov if (arg) { 3556c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3557c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3558c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3559ed0fb78fSIlya Dryomov goto out_unlock; 3560c9e9f97bSIlya Dryomov } 3561de322263SIlya Dryomov 3562de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3563de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3564de322263SIlya Dryomov ret = -ENOTCONN; 3565de322263SIlya Dryomov goto out_bargs; 3566de322263SIlya Dryomov } 3567de322263SIlya Dryomov 3568de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3569de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3570de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3571de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3572de322263SIlya Dryomov 3573de322263SIlya Dryomov goto do_balance; 3574de322263SIlya Dryomov } 3575c9e9f97bSIlya Dryomov } else { 3576c9e9f97bSIlya Dryomov bargs = NULL; 3577c9e9f97bSIlya Dryomov } 3578c9e9f97bSIlya Dryomov 3579ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3580837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3581837d5b6eSIlya Dryomov goto out_bargs; 3582837d5b6eSIlya Dryomov } 3583837d5b6eSIlya Dryomov 3584c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3585c9e9f97bSIlya Dryomov if (!bctl) { 3586c9e9f97bSIlya Dryomov ret = -ENOMEM; 3587c9e9f97bSIlya Dryomov goto out_bargs; 3588c9e9f97bSIlya Dryomov } 3589c9e9f97bSIlya Dryomov 3590c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3591c9e9f97bSIlya Dryomov if (arg) { 3592c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3593c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3594c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3595c9e9f97bSIlya Dryomov 3596c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3597f43ffb60SIlya Dryomov } else { 3598f43ffb60SIlya Dryomov /* balance everything - no filters */ 3599f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3600c9e9f97bSIlya Dryomov } 3601c9e9f97bSIlya Dryomov 3602de322263SIlya Dryomov do_balance: 3603c9e9f97bSIlya Dryomov /* 3604ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3605ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3606ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3607ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3608ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3609c9e9f97bSIlya Dryomov */ 3610ed0fb78fSIlya Dryomov need_unlock = false; 3611ed0fb78fSIlya Dryomov 3612ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3613ed0fb78fSIlya Dryomov 3614c9e9f97bSIlya Dryomov if (arg) { 3615c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3616c9e9f97bSIlya Dryomov ret = -EFAULT; 3617c9e9f97bSIlya Dryomov } 3618c9e9f97bSIlya Dryomov 3619c9e9f97bSIlya Dryomov out_bargs: 3620c9e9f97bSIlya Dryomov kfree(bargs); 3621ed0fb78fSIlya Dryomov out_unlock: 3622c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3623c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3624ed0fb78fSIlya Dryomov if (need_unlock) 3625ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3626ed0fb78fSIlya Dryomov out: 3627e54bfa31SLiu Bo mnt_drop_write_file(file); 3628c9e9f97bSIlya Dryomov return ret; 3629c9e9f97bSIlya Dryomov } 3630c9e9f97bSIlya Dryomov 3631837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3632837d5b6eSIlya Dryomov { 3633837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3634837d5b6eSIlya Dryomov return -EPERM; 3635837d5b6eSIlya Dryomov 3636837d5b6eSIlya Dryomov switch (cmd) { 3637837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3638837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3639a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3640a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3641837d5b6eSIlya Dryomov } 3642837d5b6eSIlya Dryomov 3643837d5b6eSIlya Dryomov return -EINVAL; 3644837d5b6eSIlya Dryomov } 3645837d5b6eSIlya Dryomov 364619a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 364719a39dceSIlya Dryomov void __user *arg) 364819a39dceSIlya Dryomov { 364919a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 365019a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 365119a39dceSIlya Dryomov int ret = 0; 365219a39dceSIlya Dryomov 365319a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 365419a39dceSIlya Dryomov return -EPERM; 365519a39dceSIlya Dryomov 365619a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 365719a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 365819a39dceSIlya Dryomov ret = -ENOTCONN; 365919a39dceSIlya Dryomov goto out; 366019a39dceSIlya Dryomov } 366119a39dceSIlya Dryomov 366219a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 366319a39dceSIlya Dryomov if (!bargs) { 366419a39dceSIlya Dryomov ret = -ENOMEM; 366519a39dceSIlya Dryomov goto out; 366619a39dceSIlya Dryomov } 366719a39dceSIlya Dryomov 366819a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 366919a39dceSIlya Dryomov 367019a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 367119a39dceSIlya Dryomov ret = -EFAULT; 367219a39dceSIlya Dryomov 367319a39dceSIlya Dryomov kfree(bargs); 367419a39dceSIlya Dryomov out: 367519a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 367619a39dceSIlya Dryomov return ret; 367719a39dceSIlya Dryomov } 367819a39dceSIlya Dryomov 3679905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36805d13a37bSArne Jansen { 3681905b0ddaSMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 36825d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36835d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 36845d13a37bSArne Jansen int ret; 36855d13a37bSArne Jansen int err; 36865d13a37bSArne Jansen 36875d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36885d13a37bSArne Jansen return -EPERM; 36895d13a37bSArne Jansen 3690905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3691905b0ddaSMiao Xie if (ret) 3692905b0ddaSMiao Xie return ret; 36935d13a37bSArne Jansen 36945d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3695905b0ddaSMiao Xie if (IS_ERR(sa)) { 3696905b0ddaSMiao Xie ret = PTR_ERR(sa); 3697905b0ddaSMiao Xie goto drop_write; 3698905b0ddaSMiao Xie } 36995d13a37bSArne Jansen 37005d13a37bSArne Jansen if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { 37015d13a37bSArne Jansen trans = btrfs_start_transaction(root, 2); 37025d13a37bSArne Jansen if (IS_ERR(trans)) { 37035d13a37bSArne Jansen ret = PTR_ERR(trans); 37045d13a37bSArne Jansen goto out; 37055d13a37bSArne Jansen } 37065d13a37bSArne Jansen } 37075d13a37bSArne Jansen 37085d13a37bSArne Jansen switch (sa->cmd) { 37095d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 37105d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 37115d13a37bSArne Jansen break; 37125d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 37135d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 37145d13a37bSArne Jansen break; 37155d13a37bSArne Jansen case BTRFS_QUOTA_CTL_RESCAN: 37165d13a37bSArne Jansen ret = btrfs_quota_rescan(root->fs_info); 37175d13a37bSArne Jansen break; 37185d13a37bSArne Jansen default: 37195d13a37bSArne Jansen ret = -EINVAL; 37205d13a37bSArne Jansen break; 37215d13a37bSArne Jansen } 37225d13a37bSArne Jansen 37235d13a37bSArne Jansen if (copy_to_user(arg, sa, sizeof(*sa))) 37245d13a37bSArne Jansen ret = -EFAULT; 37255d13a37bSArne Jansen 37265d13a37bSArne Jansen if (trans) { 37275d13a37bSArne Jansen err = btrfs_commit_transaction(trans, root); 37285d13a37bSArne Jansen if (err && !ret) 37295d13a37bSArne Jansen ret = err; 37305d13a37bSArne Jansen } 37315d13a37bSArne Jansen out: 37325d13a37bSArne Jansen kfree(sa); 3733905b0ddaSMiao Xie drop_write: 3734905b0ddaSMiao Xie mnt_drop_write_file(file); 37355d13a37bSArne Jansen return ret; 37365d13a37bSArne Jansen } 37375d13a37bSArne Jansen 3738905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37395d13a37bSArne Jansen { 3740905b0ddaSMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 37415d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37425d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37435d13a37bSArne Jansen int ret; 37445d13a37bSArne Jansen int err; 37455d13a37bSArne Jansen 37465d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37475d13a37bSArne Jansen return -EPERM; 37485d13a37bSArne Jansen 3749905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3750905b0ddaSMiao Xie if (ret) 3751905b0ddaSMiao Xie return ret; 37525d13a37bSArne Jansen 37535d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3754905b0ddaSMiao Xie if (IS_ERR(sa)) { 3755905b0ddaSMiao Xie ret = PTR_ERR(sa); 3756905b0ddaSMiao Xie goto drop_write; 3757905b0ddaSMiao Xie } 37585d13a37bSArne Jansen 37595d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37605d13a37bSArne Jansen if (IS_ERR(trans)) { 37615d13a37bSArne Jansen ret = PTR_ERR(trans); 37625d13a37bSArne Jansen goto out; 37635d13a37bSArne Jansen } 37645d13a37bSArne Jansen 37655d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 37665d13a37bSArne Jansen if (sa->assign) { 37675d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 37685d13a37bSArne Jansen sa->src, sa->dst); 37695d13a37bSArne Jansen } else { 37705d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 37715d13a37bSArne Jansen sa->src, sa->dst); 37725d13a37bSArne Jansen } 37735d13a37bSArne Jansen 37745d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 37755d13a37bSArne Jansen if (err && !ret) 37765d13a37bSArne Jansen ret = err; 37775d13a37bSArne Jansen 37785d13a37bSArne Jansen out: 37795d13a37bSArne Jansen kfree(sa); 3780905b0ddaSMiao Xie drop_write: 3781905b0ddaSMiao Xie mnt_drop_write_file(file); 37825d13a37bSArne Jansen return ret; 37835d13a37bSArne Jansen } 37845d13a37bSArne Jansen 3785905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37865d13a37bSArne Jansen { 3787905b0ddaSMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 37885d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37895d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37905d13a37bSArne Jansen int ret; 37915d13a37bSArne Jansen int err; 37925d13a37bSArne Jansen 37935d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37945d13a37bSArne Jansen return -EPERM; 37955d13a37bSArne Jansen 3796905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3797905b0ddaSMiao Xie if (ret) 3798905b0ddaSMiao Xie return ret; 37995d13a37bSArne Jansen 38005d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3801905b0ddaSMiao Xie if (IS_ERR(sa)) { 3802905b0ddaSMiao Xie ret = PTR_ERR(sa); 3803905b0ddaSMiao Xie goto drop_write; 3804905b0ddaSMiao Xie } 38055d13a37bSArne Jansen 3806d86e56cfSMiao Xie if (!sa->qgroupid) { 3807d86e56cfSMiao Xie ret = -EINVAL; 3808d86e56cfSMiao Xie goto out; 3809d86e56cfSMiao Xie } 3810d86e56cfSMiao Xie 38115d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38125d13a37bSArne Jansen if (IS_ERR(trans)) { 38135d13a37bSArne Jansen ret = PTR_ERR(trans); 38145d13a37bSArne Jansen goto out; 38155d13a37bSArne Jansen } 38165d13a37bSArne Jansen 38175d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38185d13a37bSArne Jansen if (sa->create) { 38195d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 38205d13a37bSArne Jansen NULL); 38215d13a37bSArne Jansen } else { 38225d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 38235d13a37bSArne Jansen } 38245d13a37bSArne Jansen 38255d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38265d13a37bSArne Jansen if (err && !ret) 38275d13a37bSArne Jansen ret = err; 38285d13a37bSArne Jansen 38295d13a37bSArne Jansen out: 38305d13a37bSArne Jansen kfree(sa); 3831905b0ddaSMiao Xie drop_write: 3832905b0ddaSMiao Xie mnt_drop_write_file(file); 38335d13a37bSArne Jansen return ret; 38345d13a37bSArne Jansen } 38355d13a37bSArne Jansen 3836905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38375d13a37bSArne Jansen { 3838905b0ddaSMiao Xie struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 38395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38415d13a37bSArne Jansen int ret; 38425d13a37bSArne Jansen int err; 38435d13a37bSArne Jansen u64 qgroupid; 38445d13a37bSArne Jansen 38455d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38465d13a37bSArne Jansen return -EPERM; 38475d13a37bSArne Jansen 3848905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3849905b0ddaSMiao Xie if (ret) 3850905b0ddaSMiao Xie return ret; 38515d13a37bSArne Jansen 38525d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3853905b0ddaSMiao Xie if (IS_ERR(sa)) { 3854905b0ddaSMiao Xie ret = PTR_ERR(sa); 3855905b0ddaSMiao Xie goto drop_write; 3856905b0ddaSMiao Xie } 38575d13a37bSArne Jansen 38585d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38595d13a37bSArne Jansen if (IS_ERR(trans)) { 38605d13a37bSArne Jansen ret = PTR_ERR(trans); 38615d13a37bSArne Jansen goto out; 38625d13a37bSArne Jansen } 38635d13a37bSArne Jansen 38645d13a37bSArne Jansen qgroupid = sa->qgroupid; 38655d13a37bSArne Jansen if (!qgroupid) { 38665d13a37bSArne Jansen /* take the current subvol as qgroup */ 38675d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38685d13a37bSArne Jansen } 38695d13a37bSArne Jansen 38705d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 38715d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 38725d13a37bSArne Jansen 38735d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 38745d13a37bSArne Jansen if (err && !ret) 38755d13a37bSArne Jansen ret = err; 38765d13a37bSArne Jansen 38775d13a37bSArne Jansen out: 38785d13a37bSArne Jansen kfree(sa); 3879905b0ddaSMiao Xie drop_write: 3880905b0ddaSMiao Xie mnt_drop_write_file(file); 38815d13a37bSArne Jansen return ret; 38825d13a37bSArne Jansen } 38835d13a37bSArne Jansen 38848ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 38858ea05e3aSAlexander Block void __user *arg) 38868ea05e3aSAlexander Block { 38878ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 38888ea05e3aSAlexander Block struct inode *inode = fdentry(file)->d_inode; 38898ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 38908ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 38918ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 38928ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 38938ea05e3aSAlexander Block int ret = 0; 38948ea05e3aSAlexander Block 38958ea05e3aSAlexander Block ret = mnt_want_write_file(file); 38968ea05e3aSAlexander Block if (ret < 0) 38978ea05e3aSAlexander Block return ret; 38988ea05e3aSAlexander Block 38998ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 39008ea05e3aSAlexander Block 39018ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 39028ea05e3aSAlexander Block ret = -EINVAL; 39038ea05e3aSAlexander Block goto out; 39048ea05e3aSAlexander Block } 39058ea05e3aSAlexander Block 39068ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39078ea05e3aSAlexander Block ret = -EROFS; 39088ea05e3aSAlexander Block goto out; 39098ea05e3aSAlexander Block } 39108ea05e3aSAlexander Block 39118ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 39128ea05e3aSAlexander Block ret = -EACCES; 39138ea05e3aSAlexander Block goto out; 39148ea05e3aSAlexander Block } 39158ea05e3aSAlexander Block 39168ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 39178ea05e3aSAlexander Block if (IS_ERR(sa)) { 39188ea05e3aSAlexander Block ret = PTR_ERR(sa); 39198ea05e3aSAlexander Block sa = NULL; 39208ea05e3aSAlexander Block goto out; 39218ea05e3aSAlexander Block } 39228ea05e3aSAlexander Block 39238ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 39248ea05e3aSAlexander Block if (IS_ERR(trans)) { 39258ea05e3aSAlexander Block ret = PTR_ERR(trans); 39268ea05e3aSAlexander Block trans = NULL; 39278ea05e3aSAlexander Block goto out; 39288ea05e3aSAlexander Block } 39298ea05e3aSAlexander Block 39308ea05e3aSAlexander Block sa->rtransid = trans->transid; 39318ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39328ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39338ea05e3aSAlexander Block 39348ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39358ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39368ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39378ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 39388ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 39398ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 39408ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 39418ea05e3aSAlexander Block 39428ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 39438ea05e3aSAlexander Block &root->root_key, &root->root_item); 39448ea05e3aSAlexander Block if (ret < 0) { 39458ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 39468ea05e3aSAlexander Block trans = NULL; 39478ea05e3aSAlexander Block goto out; 39488ea05e3aSAlexander Block } else { 39498ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 39508ea05e3aSAlexander Block if (ret < 0) 39518ea05e3aSAlexander Block goto out; 39528ea05e3aSAlexander Block } 39538ea05e3aSAlexander Block 39548ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 39558ea05e3aSAlexander Block if (ret) 39568ea05e3aSAlexander Block ret = -EFAULT; 39578ea05e3aSAlexander Block 39588ea05e3aSAlexander Block out: 39598ea05e3aSAlexander Block kfree(sa); 39608ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 39618ea05e3aSAlexander Block mnt_drop_write_file(file); 39628ea05e3aSAlexander Block return ret; 39638ea05e3aSAlexander Block } 39648ea05e3aSAlexander Block 3965867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 3966867ab667Sjeff.liu { 3967867ab667Sjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3968867ab667Sjeff.liu const char *label = root->fs_info->super_copy->label; 3969867ab667Sjeff.liu size_t len = strnlen(label, BTRFS_LABEL_SIZE); 3970867ab667Sjeff.liu int ret; 3971867ab667Sjeff.liu 3972867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 3973867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 3974867ab667Sjeff.liu --len); 3975867ab667Sjeff.liu } 3976867ab667Sjeff.liu 3977867ab667Sjeff.liu mutex_lock(&root->fs_info->volume_mutex); 3978867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 3979867ab667Sjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 3980867ab667Sjeff.liu 3981867ab667Sjeff.liu return ret ? -EFAULT : 0; 3982867ab667Sjeff.liu } 3983867ab667Sjeff.liu 3984a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 3985a8bfd4abSjeff.liu { 3986a8bfd4abSjeff.liu struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3987a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 3988a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 3989a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 3990a8bfd4abSjeff.liu int ret; 3991a8bfd4abSjeff.liu 3992a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 3993a8bfd4abSjeff.liu return -EPERM; 3994a8bfd4abSjeff.liu 3995a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 3996a8bfd4abSjeff.liu return -EFAULT; 3997a8bfd4abSjeff.liu 3998a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 3999a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4000a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4001a8bfd4abSjeff.liu return -EINVAL; 4002a8bfd4abSjeff.liu } 4003a8bfd4abSjeff.liu 4004a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4005a8bfd4abSjeff.liu if (ret) 4006a8bfd4abSjeff.liu return ret; 4007a8bfd4abSjeff.liu 4008a8bfd4abSjeff.liu mutex_lock(&root->fs_info->volume_mutex); 4009a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4010a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4011a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4012a8bfd4abSjeff.liu goto out_unlock; 4013a8bfd4abSjeff.liu } 4014a8bfd4abSjeff.liu 4015a8bfd4abSjeff.liu strcpy(super_block->label, label); 4016a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4017a8bfd4abSjeff.liu 4018a8bfd4abSjeff.liu out_unlock: 4019a8bfd4abSjeff.liu mutex_unlock(&root->fs_info->volume_mutex); 4020a8bfd4abSjeff.liu mnt_drop_write_file(file); 4021a8bfd4abSjeff.liu return ret; 4022a8bfd4abSjeff.liu } 4023a8bfd4abSjeff.liu 4024f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4025f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4026f46b5a66SChristoph Hellwig { 4027f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 40284bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4029f46b5a66SChristoph Hellwig 4030f46b5a66SChristoph Hellwig switch (cmd) { 40316cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 40326cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 40336cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 40346cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 40356cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 40366cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4037f7039b1dSLi Dongyang case FITRIM: 4038f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4039f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4040fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4041fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4042fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 40433de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4044fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 40456f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 40466f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 404776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 404876dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 40490caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 40500caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 40510caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 40520caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 40536ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 40546ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4055f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 40561e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 40571e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 40581e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4059f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4060198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4061f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 40624bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4063f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4064da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4065475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4066475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4067475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4068475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4069f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 40709ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4071f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4072c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4073c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 40747a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4075f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4076f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4077f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4078f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4079ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4080ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4081ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4082ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4083d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4084d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4085d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4086d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 40871406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 40881406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 4089f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 4090f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 4091f46b5a66SChristoph Hellwig return 0; 409246204592SSage Weil case BTRFS_IOC_START_SYNC: 40939a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 409446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 40959a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4096475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4097b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4098475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4099475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4100475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4101475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4102c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 41039ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4104837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4105837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 410619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 410719a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 41088ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 41098ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 411031db9f7cSAlexander Block case BTRFS_IOC_SEND: 411131db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4112c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4113b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 41145d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4115905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 41165d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4117905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 41185d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4119905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 41205d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4121905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 41223f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 41233f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4124867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4125867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4126a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4127a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4128f46b5a66SChristoph Hellwig } 4129f46b5a66SChristoph Hellwig 4130f46b5a66SChristoph Hellwig return -ENOTTY; 4131f46b5a66SChristoph Hellwig } 4132