1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 593b02a68aSJeff Mahoney #include "sysfs.h" 60f46b5a66SChristoph Hellwig 61416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 62416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 63416161dbSMark Fasheh 646cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 656cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 666cbff00fSChristoph Hellwig { 676cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 686cbff00fSChristoph Hellwig return flags; 696cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 706cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 716cbff00fSChristoph Hellwig else 726cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 736cbff00fSChristoph Hellwig } 74f46b5a66SChristoph Hellwig 756cbff00fSChristoph Hellwig /* 766cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 776cbff00fSChristoph Hellwig */ 786cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 796cbff00fSChristoph Hellwig { 806cbff00fSChristoph Hellwig unsigned int iflags = 0; 816cbff00fSChristoph Hellwig 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 836cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 856cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 866cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 876cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 886cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 896cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 906cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 916cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 926cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 936cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 94d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 95d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 96d0092bddSLi Zefan 97d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 98d0092bddSLi Zefan iflags |= FS_COMPR_FL; 99d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 100d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1016cbff00fSChristoph Hellwig 1026cbff00fSChristoph Hellwig return iflags; 1036cbff00fSChristoph Hellwig } 1046cbff00fSChristoph Hellwig 1056cbff00fSChristoph Hellwig /* 1066cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1076cbff00fSChristoph Hellwig */ 1086cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1096cbff00fSChristoph Hellwig { 1106cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1116cbff00fSChristoph Hellwig 1126cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1136cbff00fSChristoph Hellwig 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1166cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1176cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1186cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1196cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1206cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1216cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1226cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1236cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1246cbff00fSChristoph Hellwig } 1256cbff00fSChristoph Hellwig 1266cbff00fSChristoph Hellwig /* 1276cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1286cbff00fSChristoph Hellwig * 129e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1306cbff00fSChristoph Hellwig */ 1316cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1326cbff00fSChristoph Hellwig { 1330b4dcea5SChris Mason unsigned int flags; 1340b4dcea5SChris Mason 1350b4dcea5SChris Mason if (!dir) 1360b4dcea5SChris Mason return; 1370b4dcea5SChris Mason 1380b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1396cbff00fSChristoph Hellwig 140e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 141e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 142e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 143e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 144e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 145e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 146e27425d6SJosef Bacik } 1476cbff00fSChristoph Hellwig 148213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 149e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 150213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 151213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 152213490b3SLiu Bo } 153e27425d6SJosef Bacik 1546cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 159496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1606cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 16775e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16875e7cb7fSLiu Bo { 16975e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17075e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17175e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 172e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 173e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17475e7cb7fSLiu Bo return -EOPNOTSUPP; 17575e7cb7fSLiu Bo 17675e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17775e7cb7fSLiu Bo return -EINVAL; 17875e7cb7fSLiu Bo 17975e7cb7fSLiu Bo return 0; 18075e7cb7fSLiu Bo } 18175e7cb7fSLiu Bo 1826cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1836cbff00fSChristoph Hellwig { 184496ad9aaSAl Viro struct inode *inode = file_inode(file); 1856cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1866cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1876cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1886cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1896cbff00fSChristoph Hellwig int ret; 190f062abf0SLi Zefan u64 ip_oldflags; 191f062abf0SLi Zefan unsigned int i_oldflags; 1927e97b8daSDavid Sterba umode_t mode; 1936cbff00fSChristoph Hellwig 194b83cc969SLi Zefan if (btrfs_root_readonly(root)) 195b83cc969SLi Zefan return -EROFS; 196b83cc969SLi Zefan 1976cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1986cbff00fSChristoph Hellwig return -EFAULT; 1996cbff00fSChristoph Hellwig 20075e7cb7fSLiu Bo ret = check_flags(flags); 20175e7cb7fSLiu Bo if (ret) 20275e7cb7fSLiu Bo return ret; 2036cbff00fSChristoph Hellwig 2042e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2056cbff00fSChristoph Hellwig return -EACCES; 2066cbff00fSChristoph Hellwig 207e7848683SJan Kara ret = mnt_want_write_file(file); 208e7848683SJan Kara if (ret) 209e7848683SJan Kara return ret; 210e7848683SJan Kara 2116cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2126cbff00fSChristoph Hellwig 213f062abf0SLi Zefan ip_oldflags = ip->flags; 214f062abf0SLi Zefan i_oldflags = inode->i_flags; 2157e97b8daSDavid Sterba mode = inode->i_mode; 216f062abf0SLi Zefan 2176cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2186cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2196cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2206cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2216cbff00fSChristoph Hellwig ret = -EPERM; 2226cbff00fSChristoph Hellwig goto out_unlock; 2236cbff00fSChristoph Hellwig } 2246cbff00fSChristoph Hellwig } 2256cbff00fSChristoph Hellwig 2266cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2306cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2346cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2386cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2396cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2406cbff00fSChristoph Hellwig else 2416cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2426cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2436cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2446cbff00fSChristoph Hellwig else 2456cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2466cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2476cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2486cbff00fSChristoph Hellwig else 2496cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2507e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2517e97b8daSDavid Sterba if (S_ISREG(mode)) { 2527e97b8daSDavid Sterba /* 2537e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2547e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2557e97b8daSDavid Sterba * status of the file and will not set it. 2567e97b8daSDavid Sterba */ 2577e97b8daSDavid Sterba if (inode->i_size == 0) 2587e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2597e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2607e97b8daSDavid Sterba } else { 261e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2627e97b8daSDavid Sterba } 2637e97b8daSDavid Sterba } else { 2647e97b8daSDavid Sterba /* 2657e97b8daSDavid Sterba * Revert back under same assuptions as above 2667e97b8daSDavid Sterba */ 2677e97b8daSDavid Sterba if (S_ISREG(mode)) { 2687e97b8daSDavid Sterba if (inode->i_size == 0) 2697e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2707e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2717e97b8daSDavid Sterba } else { 272e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2737e97b8daSDavid Sterba } 2747e97b8daSDavid Sterba } 2756cbff00fSChristoph Hellwig 27675e7cb7fSLiu Bo /* 27775e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27875e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27975e7cb7fSLiu Bo * things smaller. 28075e7cb7fSLiu Bo */ 28175e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 28275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 28375e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28475e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 28575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 28675e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 287ebcb904dSLi Zefan } else { 288ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28975e7cb7fSLiu Bo } 2906cbff00fSChristoph Hellwig 2914da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 292f062abf0SLi Zefan if (IS_ERR(trans)) { 293f062abf0SLi Zefan ret = PTR_ERR(trans); 294f062abf0SLi Zefan goto out_drop; 295f062abf0SLi Zefan } 2966cbff00fSChristoph Hellwig 297306424ccSLi Zefan btrfs_update_iflags(inode); 2980c4d2d95SJosef Bacik inode_inc_iversion(inode); 299306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3006cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3016cbff00fSChristoph Hellwig 3026cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 303f062abf0SLi Zefan out_drop: 304f062abf0SLi Zefan if (ret) { 305f062abf0SLi Zefan ip->flags = ip_oldflags; 306f062abf0SLi Zefan inode->i_flags = i_oldflags; 307f062abf0SLi Zefan } 3086cbff00fSChristoph Hellwig 3096cbff00fSChristoph Hellwig out_unlock: 3106cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 311e7848683SJan Kara mnt_drop_write_file(file); 3122d4e6f6aSliubo return ret; 3136cbff00fSChristoph Hellwig } 3146cbff00fSChristoph Hellwig 3156cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3166cbff00fSChristoph Hellwig { 317496ad9aaSAl Viro struct inode *inode = file_inode(file); 3186cbff00fSChristoph Hellwig 3196cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3206cbff00fSChristoph Hellwig } 321f46b5a66SChristoph Hellwig 322f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 323f7039b1dSLi Dongyang { 32454563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 325f7039b1dSLi Dongyang struct btrfs_device *device; 326f7039b1dSLi Dongyang struct request_queue *q; 327f7039b1dSLi Dongyang struct fstrim_range range; 328f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 329f7039b1dSLi Dongyang u64 num_devices = 0; 330815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 331f7039b1dSLi Dongyang int ret; 332f7039b1dSLi Dongyang 333f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 334f7039b1dSLi Dongyang return -EPERM; 335f7039b1dSLi Dongyang 3361f78160cSXiao Guangrong rcu_read_lock(); 3371f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3381f78160cSXiao Guangrong dev_list) { 339f7039b1dSLi Dongyang if (!device->bdev) 340f7039b1dSLi Dongyang continue; 341f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 342f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 343f7039b1dSLi Dongyang num_devices++; 344f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 345f7039b1dSLi Dongyang minlen); 346f7039b1dSLi Dongyang } 347f7039b1dSLi Dongyang } 3481f78160cSXiao Guangrong rcu_read_unlock(); 349f4c697e6SLukas Czerner 350f7039b1dSLi Dongyang if (!num_devices) 351f7039b1dSLi Dongyang return -EOPNOTSUPP; 352f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 353f7039b1dSLi Dongyang return -EFAULT; 354e515c18bSLukas Czerner if (range.start > total_bytes || 355e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 356f4c697e6SLukas Czerner return -EINVAL; 357f7039b1dSLi Dongyang 358f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 359f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 360815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 361f7039b1dSLi Dongyang if (ret < 0) 362f7039b1dSLi Dongyang return ret; 363f7039b1dSLi Dongyang 364f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 365f7039b1dSLi Dongyang return -EFAULT; 366f7039b1dSLi Dongyang 367f7039b1dSLi Dongyang return 0; 368f7039b1dSLi Dongyang } 369f7039b1dSLi Dongyang 370dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 371dd5f9615SStefan Behrens { 37246e0f66aSChris Mason int i; 37346e0f66aSChris Mason 37446e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 37546e0f66aSChris Mason if (uuid[i]) 37646e0f66aSChris Mason return 0; 37746e0f66aSChris Mason } 37846e0f66aSChris Mason return 1; 379dd5f9615SStefan Behrens } 380dd5f9615SStefan Behrens 381d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 382cb8e7090SChristoph Hellwig struct dentry *dentry, 38372fd032eSSage Weil char *name, int namelen, 3846f72c7e2SArne Jansen u64 *async_transid, 3858696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 386f46b5a66SChristoph Hellwig { 387f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 388f46b5a66SChristoph Hellwig struct btrfs_key key; 389f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 390f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 391f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 392d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 39376dda93cSYan, Zheng struct btrfs_root *new_root; 394d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 3958ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 396f46b5a66SChristoph Hellwig int ret; 397f46b5a66SChristoph Hellwig int err; 398f46b5a66SChristoph Hellwig u64 objectid; 399f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4003de4586cSChris Mason u64 index = 0; 401d5c12070SMiao Xie u64 qgroup_reserved; 4028ea05e3aSAlexander Block uuid_le new_uuid; 403f46b5a66SChristoph Hellwig 404581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4052fbe8c8aSAl Viro if (ret) 406a22285a6SYan, Zheng return ret; 4076a912213SJosef Bacik 408d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4099ed74f2dSJosef Bacik /* 410d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 411d5c12070SMiao Xie * of create_snapshot(). 4129ed74f2dSJosef Bacik */ 413d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 414dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 415d5c12070SMiao Xie if (ret) 416d5c12070SMiao Xie return ret; 417f46b5a66SChristoph Hellwig 418d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 419d5c12070SMiao Xie if (IS_ERR(trans)) { 420d5c12070SMiao Xie ret = PTR_ERR(trans); 421d5c12070SMiao Xie goto out; 422d5c12070SMiao Xie } 423d5c12070SMiao Xie trans->block_rsv = &block_rsv; 424d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 425f46b5a66SChristoph Hellwig 4268696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4276f72c7e2SArne Jansen if (ret) 4286f72c7e2SArne Jansen goto fail; 4296f72c7e2SArne Jansen 4305d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4315581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4328e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4338e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4348e8a1e31SJosef Bacik goto fail; 4358e8a1e31SJosef Bacik } 436f46b5a66SChristoph Hellwig 4375d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 438f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 439f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4405d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 441f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 442f46b5a66SChristoph Hellwig 4430a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 444f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4455d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 446b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4475d4f98a2SYan Zheng BTRFS_UUID_SIZE); 448f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 449f46b5a66SChristoph Hellwig 4508ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4518ea05e3aSAlexander Block 452f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4533cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 4543cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 4553cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 4563cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 4573cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 458f46b5a66SChristoph Hellwig 4593cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 4603cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 4613cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 46208fe4db1SLi Zefan 463f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 46484234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 465f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 466f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 46786b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 46880ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 469f46b5a66SChristoph Hellwig 4708ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4718ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4728ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4738ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4743cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 4753cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 4768ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4778ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4788ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 479f46b5a66SChristoph Hellwig 480925baeddSChris Mason btrfs_tree_unlock(leaf); 481f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 482f46b5a66SChristoph Hellwig leaf = NULL; 483f46b5a66SChristoph Hellwig 484f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 485f46b5a66SChristoph Hellwig 486f46b5a66SChristoph Hellwig key.objectid = objectid; 4875d4f98a2SYan Zheng key.offset = 0; 488f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 489f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 490f46b5a66SChristoph Hellwig &root_item); 491f46b5a66SChristoph Hellwig if (ret) 492f46b5a66SChristoph Hellwig goto fail; 493f46b5a66SChristoph Hellwig 49476dda93cSYan, Zheng key.offset = (u64)-1; 49576dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 49679787eaaSJeff Mahoney if (IS_ERR(new_root)) { 49779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 49879787eaaSJeff Mahoney ret = PTR_ERR(new_root); 49979787eaaSJeff Mahoney goto fail; 50079787eaaSJeff Mahoney } 50176dda93cSYan, Zheng 50276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 50376dda93cSYan, Zheng 504d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 505ce598979SMark Fasheh if (ret) { 506ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 50779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 508ce598979SMark Fasheh goto fail; 509ce598979SMark Fasheh } 510ce598979SMark Fasheh 511f46b5a66SChristoph Hellwig /* 512f46b5a66SChristoph Hellwig * insert the directory item 513f46b5a66SChristoph Hellwig */ 5143de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 51579787eaaSJeff Mahoney if (ret) { 51679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 51779787eaaSJeff Mahoney goto fail; 51879787eaaSJeff Mahoney } 5193de4586cSChris Mason 5203de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 52116cdcec7SMiao Xie name, namelen, dir, &key, 5223de4586cSChris Mason BTRFS_FT_DIR, index); 52379787eaaSJeff Mahoney if (ret) { 52479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 525f46b5a66SChristoph Hellwig goto fail; 52679787eaaSJeff Mahoney } 5270660b5afSChris Mason 52852c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 52952c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 53052c26179SYan Zheng BUG_ON(ret); 53152c26179SYan Zheng 5320660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5334df27c4dSYan, Zheng objectid, root->root_key.objectid, 53433345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5350660b5afSChris Mason BUG_ON(ret); 5360660b5afSChris Mason 537dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 538dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 539dd5f9615SStefan Behrens objectid); 540dd5f9615SStefan Behrens if (ret) 541dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 542dd5f9615SStefan Behrens 543f46b5a66SChristoph Hellwig fail: 544d5c12070SMiao Xie trans->block_rsv = NULL; 545d5c12070SMiao Xie trans->bytes_reserved = 0; 54672fd032eSSage Weil if (async_transid) { 54772fd032eSSage Weil *async_transid = trans->transid; 54872fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 54900d71c9cSMiao Xie if (err) 55000d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 55172fd032eSSage Weil } else { 55276dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 55372fd032eSSage Weil } 554f46b5a66SChristoph Hellwig if (err && !ret) 555f46b5a66SChristoph Hellwig ret = err; 5561a65e24bSChris Mason 5571a65e24bSChris Mason if (!ret) 5581a65e24bSChris Mason d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 559d5c12070SMiao Xie out: 560d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 561f46b5a66SChristoph Hellwig return ret; 562f46b5a66SChristoph Hellwig } 563f46b5a66SChristoph Hellwig 564e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 565e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 566e9662f70SMiao Xie u64 *async_transid, bool readonly, 567e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 568f46b5a66SChristoph Hellwig { 5692e4bfab9SYan, Zheng struct inode *inode; 570f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 571f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5722e4bfab9SYan, Zheng int ret; 573f46b5a66SChristoph Hellwig 574f46b5a66SChristoph Hellwig if (!root->ref_cows) 575f46b5a66SChristoph Hellwig return -EINVAL; 576f46b5a66SChristoph Hellwig 5776a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 5786a03843dSMiao Xie if (ret) 5796a03843dSMiao Xie return ret; 5806a03843dSMiao Xie 581b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 5826a03843dSMiao Xie 583a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 584a22285a6SYan, Zheng if (!pending_snapshot) 585a22285a6SYan, Zheng return -ENOMEM; 586a22285a6SYan, Zheng 58766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 58866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 589d5c12070SMiao Xie /* 590d5c12070SMiao Xie * 1 - parent dir inode 591d5c12070SMiao Xie * 2 - dir entries 592d5c12070SMiao Xie * 1 - root item 593d5c12070SMiao Xie * 2 - root ref/backref 594d5c12070SMiao Xie * 1 - root of snapshot 595dd5f9615SStefan Behrens * 1 - UUID item 596d5c12070SMiao Xie */ 597d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 598dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 599ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 600ee3441b4SJeff Mahoney false); 601d5c12070SMiao Xie if (ret) 602d5c12070SMiao Xie goto out; 603d5c12070SMiao Xie 604a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 605a22285a6SYan, Zheng pending_snapshot->root = root; 606b83cc969SLi Zefan pending_snapshot->readonly = readonly; 607e9662f70SMiao Xie pending_snapshot->dir = dir; 6088696c533SMiao Xie pending_snapshot->inherit = inherit; 609a22285a6SYan, Zheng 610d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 611a22285a6SYan, Zheng if (IS_ERR(trans)) { 612a22285a6SYan, Zheng ret = PTR_ERR(trans); 613a22285a6SYan, Zheng goto fail; 614a22285a6SYan, Zheng } 615a22285a6SYan, Zheng 6168351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 617a22285a6SYan, Zheng list_add(&pending_snapshot->list, 618a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6198351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 62072fd032eSSage Weil if (async_transid) { 62172fd032eSSage Weil *async_transid = trans->transid; 62272fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 62372fd032eSSage Weil root->fs_info->extent_root, 1); 62400d71c9cSMiao Xie if (ret) 62500d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 62672fd032eSSage Weil } else { 62772fd032eSSage Weil ret = btrfs_commit_transaction(trans, 62872fd032eSSage Weil root->fs_info->extent_root); 62972fd032eSSage Weil } 630aec8030aSMiao Xie if (ret) 631c37b2b62SJosef Bacik goto fail; 632a22285a6SYan, Zheng 633a22285a6SYan, Zheng ret = pending_snapshot->error; 634f46b5a66SChristoph Hellwig if (ret) 6352e4bfab9SYan, Zheng goto fail; 636f46b5a66SChristoph Hellwig 63766b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 63866b4ffd1SJosef Bacik if (ret) 63966b4ffd1SJosef Bacik goto fail; 640f46b5a66SChristoph Hellwig 6412fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6422e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6432e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6442e4bfab9SYan, Zheng goto fail; 6452e4bfab9SYan, Zheng } 6462e4bfab9SYan, Zheng BUG_ON(!inode); 6472e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6482e4bfab9SYan, Zheng ret = 0; 6492e4bfab9SYan, Zheng fail: 650d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 651d5c12070SMiao Xie &pending_snapshot->block_rsv, 652d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 653d5c12070SMiao Xie out: 654a22285a6SYan, Zheng kfree(pending_snapshot); 655f46b5a66SChristoph Hellwig return ret; 656f46b5a66SChristoph Hellwig } 657f46b5a66SChristoph Hellwig 6584260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6594260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6604260f7c7SSage Weil * minimal. 6614260f7c7SSage Weil */ 6624260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6634260f7c7SSage Weil { 6642f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6654260f7c7SSage Weil 6664260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6674260f7c7SSage Weil return 0; 6682f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6694260f7c7SSage Weil return 0; 6702f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6714260f7c7SSage Weil return 0; 6724260f7c7SSage Weil return !capable(CAP_FOWNER); 6734260f7c7SSage Weil } 6744260f7c7SSage Weil 6754260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6764260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6774260f7c7SSage Weil * whether the type of victim is right. 6784260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6794260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6804260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6814260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6824260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6834260f7c7SSage Weil * a. be owner of dir, or 6844260f7c7SSage Weil * b. be owner of victim, or 6854260f7c7SSage Weil * c. have CAP_FOWNER capability 6864260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6874260f7c7SSage Weil * links pointing to it. 6884260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6894260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6904260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6914260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6924260f7c7SSage Weil * nfs_async_unlink(). 6934260f7c7SSage Weil */ 6944260f7c7SSage Weil 6954260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 6964260f7c7SSage Weil { 6974260f7c7SSage Weil int error; 6984260f7c7SSage Weil 6994260f7c7SSage Weil if (!victim->d_inode) 7004260f7c7SSage Weil return -ENOENT; 7014260f7c7SSage Weil 7024260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7034fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7044260f7c7SSage Weil 7054260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7064260f7c7SSage Weil if (error) 7074260f7c7SSage Weil return error; 7084260f7c7SSage Weil if (IS_APPEND(dir)) 7094260f7c7SSage Weil return -EPERM; 7104260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7114260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7124260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7134260f7c7SSage Weil return -EPERM; 7144260f7c7SSage Weil if (isdir) { 7154260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7164260f7c7SSage Weil return -ENOTDIR; 7174260f7c7SSage Weil if (IS_ROOT(victim)) 7184260f7c7SSage Weil return -EBUSY; 7194260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7204260f7c7SSage Weil return -EISDIR; 7214260f7c7SSage Weil if (IS_DEADDIR(dir)) 7224260f7c7SSage Weil return -ENOENT; 7234260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7244260f7c7SSage Weil return -EBUSY; 7254260f7c7SSage Weil return 0; 7264260f7c7SSage Weil } 7274260f7c7SSage Weil 728cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 729cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 730cb8e7090SChristoph Hellwig { 731cb8e7090SChristoph Hellwig if (child->d_inode) 732cb8e7090SChristoph Hellwig return -EEXIST; 733cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 734cb8e7090SChristoph Hellwig return -ENOENT; 735cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 736cb8e7090SChristoph Hellwig } 737cb8e7090SChristoph Hellwig 738cb8e7090SChristoph Hellwig /* 739cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 740cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 741cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 742cb8e7090SChristoph Hellwig */ 74376dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 74476dda93cSYan, Zheng char *name, int namelen, 74572fd032eSSage Weil struct btrfs_root *snap_src, 7466f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7478696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 748cb8e7090SChristoph Hellwig { 74976dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 750cb8e7090SChristoph Hellwig struct dentry *dentry; 751cb8e7090SChristoph Hellwig int error; 752cb8e7090SChristoph Hellwig 7535c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7545c50c9b8SDavid Sterba if (error == -EINTR) 7555c50c9b8SDavid Sterba return error; 756cb8e7090SChristoph Hellwig 757cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 758cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 759cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 760cb8e7090SChristoph Hellwig goto out_unlock; 761cb8e7090SChristoph Hellwig 762cb8e7090SChristoph Hellwig error = -EEXIST; 763cb8e7090SChristoph Hellwig if (dentry->d_inode) 764cb8e7090SChristoph Hellwig goto out_dput; 765cb8e7090SChristoph Hellwig 76676dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 767cb8e7090SChristoph Hellwig if (error) 768a874a63eSLiu Bo goto out_dput; 769cb8e7090SChristoph Hellwig 7709c52057cSChris Mason /* 7719c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7729c52057cSChris Mason * check for them now when we can safely fail 7739c52057cSChris Mason */ 7749c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7759c52057cSChris Mason dir->i_ino, name, 7769c52057cSChris Mason namelen); 7779c52057cSChris Mason if (error) 7789c52057cSChris Mason goto out_dput; 7799c52057cSChris Mason 78076dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 78176dda93cSYan, Zheng 78276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 78376dda93cSYan, Zheng goto out_up_read; 78476dda93cSYan, Zheng 7853de4586cSChris Mason if (snap_src) { 786e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 7876f72c7e2SArne Jansen async_transid, readonly, inherit); 7883de4586cSChris Mason } else { 789d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 790d5c12070SMiao Xie async_transid, inherit); 7913de4586cSChris Mason } 79276dda93cSYan, Zheng if (!error) 79376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 79476dda93cSYan, Zheng out_up_read: 79576dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 796cb8e7090SChristoph Hellwig out_dput: 797cb8e7090SChristoph Hellwig dput(dentry); 798cb8e7090SChristoph Hellwig out_unlock: 79976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 800cb8e7090SChristoph Hellwig return error; 801cb8e7090SChristoph Hellwig } 802cb8e7090SChristoph Hellwig 8034cb5300bSChris Mason /* 8044cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8054cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8064cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8074cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8084cb5300bSChris Mason * part of the file 8094cb5300bSChris Mason */ 8104cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8114cb5300bSChris Mason { 8124cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8134cb5300bSChris Mason struct extent_map *em = NULL; 8144cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8154cb5300bSChris Mason u64 end; 8164cb5300bSChris Mason 8174cb5300bSChris Mason read_lock(&em_tree->lock); 8184cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8194cb5300bSChris Mason read_unlock(&em_tree->lock); 8204cb5300bSChris Mason 8214cb5300bSChris Mason if (em) { 8224cb5300bSChris Mason end = extent_map_end(em); 8234cb5300bSChris Mason free_extent_map(em); 8244cb5300bSChris Mason if (end - offset > thresh) 8254cb5300bSChris Mason return 0; 8264cb5300bSChris Mason } 8274cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8284cb5300bSChris Mason thresh /= 2; 8294cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8304cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8314cb5300bSChris Mason if (end >= thresh) 8324cb5300bSChris Mason return 0; 8334cb5300bSChris Mason return 1; 8344cb5300bSChris Mason } 8354cb5300bSChris Mason 8364cb5300bSChris Mason /* 8374cb5300bSChris Mason * helper function to walk through a file and find extents 8384cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8394cb5300bSChris Mason * 8404cb5300bSChris Mason * This is used by the defragging code to find new and small 8414cb5300bSChris Mason * extents 8424cb5300bSChris Mason */ 8434cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8444cb5300bSChris Mason struct inode *inode, u64 newer_than, 8454cb5300bSChris Mason u64 *off, int thresh) 8464cb5300bSChris Mason { 8474cb5300bSChris Mason struct btrfs_path *path; 8484cb5300bSChris Mason struct btrfs_key min_key; 8494cb5300bSChris Mason struct extent_buffer *leaf; 8504cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8514cb5300bSChris Mason int type; 8524cb5300bSChris Mason int ret; 853a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8544cb5300bSChris Mason 8554cb5300bSChris Mason path = btrfs_alloc_path(); 8564cb5300bSChris Mason if (!path) 8574cb5300bSChris Mason return -ENOMEM; 8584cb5300bSChris Mason 859a4689d2bSDavid Sterba min_key.objectid = ino; 8604cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8614cb5300bSChris Mason min_key.offset = *off; 8624cb5300bSChris Mason 8634cb5300bSChris Mason path->keep_locks = 1; 8644cb5300bSChris Mason 8654cb5300bSChris Mason while (1) { 8666174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 8674cb5300bSChris Mason if (ret != 0) 8684cb5300bSChris Mason goto none; 869a4689d2bSDavid Sterba if (min_key.objectid != ino) 8704cb5300bSChris Mason goto none; 8714cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8724cb5300bSChris Mason goto none; 8734cb5300bSChris Mason 8744cb5300bSChris Mason leaf = path->nodes[0]; 8754cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8764cb5300bSChris Mason struct btrfs_file_extent_item); 8774cb5300bSChris Mason 8784cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8794cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8804cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8814cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8824cb5300bSChris Mason *off = min_key.offset; 8834cb5300bSChris Mason btrfs_free_path(path); 8844cb5300bSChris Mason return 0; 8854cb5300bSChris Mason } 8864cb5300bSChris Mason 8874cb5300bSChris Mason if (min_key.offset == (u64)-1) 8884cb5300bSChris Mason goto none; 8894cb5300bSChris Mason 8904cb5300bSChris Mason min_key.offset++; 8914cb5300bSChris Mason btrfs_release_path(path); 8924cb5300bSChris Mason } 8934cb5300bSChris Mason none: 8944cb5300bSChris Mason btrfs_free_path(path); 8954cb5300bSChris Mason return -ENOENT; 8964cb5300bSChris Mason } 8974cb5300bSChris Mason 8986c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 89917ce6ef8SLiu Bo { 90017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 901940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9026c282eb4SLi Zefan struct extent_map *em; 9036c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 904940100a4SChris Mason 905940100a4SChris Mason /* 906940100a4SChris Mason * hopefully we have this extent in the tree already, try without 907940100a4SChris Mason * the full extent lock 908940100a4SChris Mason */ 909940100a4SChris Mason read_lock(&em_tree->lock); 910940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 911940100a4SChris Mason read_unlock(&em_tree->lock); 912940100a4SChris Mason 913940100a4SChris Mason if (!em) { 914940100a4SChris Mason /* get the big lock and read metadata off disk */ 915d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 916940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 917d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 918940100a4SChris Mason 9196cf8bfbfSDan Carpenter if (IS_ERR(em)) 9206c282eb4SLi Zefan return NULL; 921940100a4SChris Mason } 922940100a4SChris Mason 9236c282eb4SLi Zefan return em; 9246c282eb4SLi Zefan } 9256c282eb4SLi Zefan 9266c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9276c282eb4SLi Zefan { 9286c282eb4SLi Zefan struct extent_map *next; 9296c282eb4SLi Zefan bool ret = true; 9306c282eb4SLi Zefan 9316c282eb4SLi Zefan /* this is the last extent */ 9326c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9336c282eb4SLi Zefan return false; 9346c282eb4SLi Zefan 9356c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9366c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9376c282eb4SLi Zefan ret = false; 9386c282eb4SLi Zefan 9396c282eb4SLi Zefan free_extent_map(next); 9406c282eb4SLi Zefan return ret; 9416c282eb4SLi Zefan } 9426c282eb4SLi Zefan 9436c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 944a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 945a43a2111SAndrew Mahone int compress) 9466c282eb4SLi Zefan { 9476c282eb4SLi Zefan struct extent_map *em; 9486c282eb4SLi Zefan int ret = 1; 9496c282eb4SLi Zefan bool next_mergeable = true; 9506c282eb4SLi Zefan 9516c282eb4SLi Zefan /* 9526c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9536c282eb4SLi Zefan * defragging it 9546c282eb4SLi Zefan */ 9556c282eb4SLi Zefan if (start < *defrag_end) 9566c282eb4SLi Zefan return 1; 9576c282eb4SLi Zefan 9586c282eb4SLi Zefan *skip = 0; 9596c282eb4SLi Zefan 9606c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9616c282eb4SLi Zefan if (!em) 9626c282eb4SLi Zefan return 0; 9636c282eb4SLi Zefan 964940100a4SChris Mason /* this will cover holes, and inline extents */ 96517ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 966940100a4SChris Mason ret = 0; 96717ce6ef8SLiu Bo goto out; 96817ce6ef8SLiu Bo } 96917ce6ef8SLiu Bo 9706c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 971940100a4SChris Mason 972940100a4SChris Mason /* 9736c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9746c282eb4SLi Zefan * real extent, don't bother defragging it 975940100a4SChris Mason */ 976a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9776c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 978940100a4SChris Mason ret = 0; 97917ce6ef8SLiu Bo out: 980940100a4SChris Mason /* 981940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 982940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 983940100a4SChris Mason * so that the next tiny extent will force a defrag. 984940100a4SChris Mason * 985940100a4SChris Mason * The end result of this is that tiny extents before a single big 986940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 987940100a4SChris Mason */ 988940100a4SChris Mason if (ret) { 989940100a4SChris Mason *defrag_end = extent_map_end(em); 990940100a4SChris Mason } else { 991940100a4SChris Mason *last_len = 0; 992940100a4SChris Mason *skip = extent_map_end(em); 993940100a4SChris Mason *defrag_end = 0; 994940100a4SChris Mason } 995940100a4SChris Mason 996940100a4SChris Mason free_extent_map(em); 997940100a4SChris Mason return ret; 998940100a4SChris Mason } 999940100a4SChris Mason 10004cb5300bSChris Mason /* 10014cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10024cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10034cb5300bSChris Mason * to COW and defrag. 10044cb5300bSChris Mason * 10054cb5300bSChris Mason * It also makes sure the delalloc code has enough 10064cb5300bSChris Mason * dirty data to avoid making new small extents as part 10074cb5300bSChris Mason * of the defrag 10084cb5300bSChris Mason * 10094cb5300bSChris Mason * It's a good idea to start RA on this range 10104cb5300bSChris Mason * before calling this. 10114cb5300bSChris Mason */ 10124cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10134cb5300bSChris Mason struct page **pages, 10144cb5300bSChris Mason unsigned long start_index, 10154cb5300bSChris Mason int num_pages) 1016f46b5a66SChristoph Hellwig { 10174cb5300bSChris Mason unsigned long file_end; 10184cb5300bSChris Mason u64 isize = i_size_read(inode); 1019f46b5a66SChristoph Hellwig u64 page_start; 1020f46b5a66SChristoph Hellwig u64 page_end; 10211f12bd06SLiu Bo u64 page_cnt; 10224cb5300bSChris Mason int ret; 10234cb5300bSChris Mason int i; 10244cb5300bSChris Mason int i_done; 10254cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10264cb5300bSChris Mason struct extent_state *cached_state = NULL; 1027600a45e1SMiao Xie struct extent_io_tree *tree; 10283b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10294cb5300bSChris Mason 10304cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10311f12bd06SLiu Bo if (!isize || start_index > file_end) 10321f12bd06SLiu Bo return 0; 10331f12bd06SLiu Bo 10341f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10354cb5300bSChris Mason 10364cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10371f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10384cb5300bSChris Mason if (ret) 10394cb5300bSChris Mason return ret; 10404cb5300bSChris Mason i_done = 0; 1041600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10424cb5300bSChris Mason 10434cb5300bSChris Mason /* step one, lock all the pages */ 10441f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10454cb5300bSChris Mason struct page *page; 1046600a45e1SMiao Xie again: 1047a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10483b16a4e3SJosef Bacik start_index + i, mask); 10494cb5300bSChris Mason if (!page) 10504cb5300bSChris Mason break; 10514cb5300bSChris Mason 1052600a45e1SMiao Xie page_start = page_offset(page); 1053600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1054600a45e1SMiao Xie while (1) { 1055d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1056600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1057600a45e1SMiao Xie page_start); 1058d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1059600a45e1SMiao Xie if (!ordered) 1060600a45e1SMiao Xie break; 1061600a45e1SMiao Xie 1062600a45e1SMiao Xie unlock_page(page); 1063600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1064600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1065600a45e1SMiao Xie lock_page(page); 10661f12bd06SLiu Bo /* 10671f12bd06SLiu Bo * we unlocked the page above, so we need check if 10681f12bd06SLiu Bo * it was released or not. 10691f12bd06SLiu Bo */ 10701f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10711f12bd06SLiu Bo unlock_page(page); 10721f12bd06SLiu Bo page_cache_release(page); 10731f12bd06SLiu Bo goto again; 10741f12bd06SLiu Bo } 1075600a45e1SMiao Xie } 1076600a45e1SMiao Xie 10774cb5300bSChris Mason if (!PageUptodate(page)) { 10784cb5300bSChris Mason btrfs_readpage(NULL, page); 10794cb5300bSChris Mason lock_page(page); 10804cb5300bSChris Mason if (!PageUptodate(page)) { 10814cb5300bSChris Mason unlock_page(page); 10824cb5300bSChris Mason page_cache_release(page); 10834cb5300bSChris Mason ret = -EIO; 10844cb5300bSChris Mason break; 10854cb5300bSChris Mason } 10864cb5300bSChris Mason } 1087600a45e1SMiao Xie 1088600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1089600a45e1SMiao Xie unlock_page(page); 1090600a45e1SMiao Xie page_cache_release(page); 1091600a45e1SMiao Xie goto again; 1092600a45e1SMiao Xie } 1093600a45e1SMiao Xie 10944cb5300bSChris Mason pages[i] = page; 10954cb5300bSChris Mason i_done++; 10964cb5300bSChris Mason } 10974cb5300bSChris Mason if (!i_done || ret) 10984cb5300bSChris Mason goto out; 10994cb5300bSChris Mason 11004cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11014cb5300bSChris Mason goto out; 11024cb5300bSChris Mason 11034cb5300bSChris Mason /* 11044cb5300bSChris Mason * so now we have a nice long stream of locked 11054cb5300bSChris Mason * and up to date pages, lets wait on them 11064cb5300bSChris Mason */ 11074cb5300bSChris Mason for (i = 0; i < i_done; i++) 11084cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11094cb5300bSChris Mason 11104cb5300bSChris Mason page_start = page_offset(pages[0]); 11114cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11124cb5300bSChris Mason 11134cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1114d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11154cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11164cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11179e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11189e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11194cb5300bSChris Mason 11201f12bd06SLiu Bo if (i_done != page_cnt) { 11219e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11229e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11239e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11244cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11251f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11264cb5300bSChris Mason } 11274cb5300bSChris Mason 11284cb5300bSChris Mason 11299e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11309e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11314cb5300bSChris Mason 11324cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11334cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11344cb5300bSChris Mason GFP_NOFS); 11354cb5300bSChris Mason 11364cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11374cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11384cb5300bSChris Mason ClearPageChecked(pages[i]); 11394cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11404cb5300bSChris Mason set_page_dirty(pages[i]); 11414cb5300bSChris Mason unlock_page(pages[i]); 11424cb5300bSChris Mason page_cache_release(pages[i]); 11434cb5300bSChris Mason } 11444cb5300bSChris Mason return i_done; 11454cb5300bSChris Mason out: 11464cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11474cb5300bSChris Mason unlock_page(pages[i]); 11484cb5300bSChris Mason page_cache_release(pages[i]); 11494cb5300bSChris Mason } 11501f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11514cb5300bSChris Mason return ret; 11524cb5300bSChris Mason 11534cb5300bSChris Mason } 11544cb5300bSChris Mason 11554cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11564cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11574cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11584cb5300bSChris Mason { 11594cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11604cb5300bSChris Mason struct file_ra_state *ra = NULL; 11614cb5300bSChris Mason unsigned long last_index; 1162151a31b2SLi Zefan u64 isize = i_size_read(inode); 1163940100a4SChris Mason u64 last_len = 0; 1164940100a4SChris Mason u64 skip = 0; 1165940100a4SChris Mason u64 defrag_end = 0; 11664cb5300bSChris Mason u64 newer_off = range->start; 1167f46b5a66SChristoph Hellwig unsigned long i; 1168008873eaSLi Zefan unsigned long ra_index = 0; 1169f46b5a66SChristoph Hellwig int ret; 11704cb5300bSChris Mason int defrag_count = 0; 11711a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11724cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1173008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1174008873eaSLi Zefan int cluster = max_cluster; 11754cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11764cb5300bSChris Mason struct page **pages = NULL; 11774cb5300bSChris Mason 11780abd5b17SLiu Bo if (isize == 0) 11790abd5b17SLiu Bo return 0; 11800abd5b17SLiu Bo 11810abd5b17SLiu Bo if (range->start >= isize) 11820abd5b17SLiu Bo return -EINVAL; 11831a419d85SLi Zefan 11841a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11851a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11861a419d85SLi Zefan return -EINVAL; 11871a419d85SLi Zefan if (range->compress_type) 11881a419d85SLi Zefan compress_type = range->compress_type; 11891a419d85SLi Zefan } 1190f46b5a66SChristoph Hellwig 11910abd5b17SLiu Bo if (extent_thresh == 0) 11920abd5b17SLiu Bo extent_thresh = 256 * 1024; 1193f46b5a66SChristoph Hellwig 11944cb5300bSChris Mason /* 11954cb5300bSChris Mason * if we were not given a file, allocate a readahead 11964cb5300bSChris Mason * context 11974cb5300bSChris Mason */ 11984cb5300bSChris Mason if (!file) { 11994cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12004cb5300bSChris Mason if (!ra) 12014cb5300bSChris Mason return -ENOMEM; 12024cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12034cb5300bSChris Mason } else { 12044cb5300bSChris Mason ra = &file->f_ra; 12054cb5300bSChris Mason } 12064cb5300bSChris Mason 1207d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12084cb5300bSChris Mason GFP_NOFS); 12094cb5300bSChris Mason if (!pages) { 12104cb5300bSChris Mason ret = -ENOMEM; 12114cb5300bSChris Mason goto out_ra; 12124cb5300bSChris Mason } 12134cb5300bSChris Mason 12144cb5300bSChris Mason /* find the last page to defrag */ 12151e701a32SChris Mason if (range->start + range->len > range->start) { 1216151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12171e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12181e701a32SChris Mason } else { 1219151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12201e701a32SChris Mason } 12211e701a32SChris Mason 12224cb5300bSChris Mason if (newer_than) { 12234cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12244cb5300bSChris Mason &newer_off, 64 * 1024); 12254cb5300bSChris Mason if (!ret) { 12264cb5300bSChris Mason range->start = newer_off; 12274cb5300bSChris Mason /* 12284cb5300bSChris Mason * we always align our defrag to help keep 12294cb5300bSChris Mason * the extents in the file evenly spaced 12304cb5300bSChris Mason */ 12314cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12324cb5300bSChris Mason } else 12334cb5300bSChris Mason goto out_ra; 12344cb5300bSChris Mason } else { 12351e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12364cb5300bSChris Mason } 12374cb5300bSChris Mason if (!max_to_defrag) 12387ec31b54SLiu Bo max_to_defrag = last_index + 1; 12394cb5300bSChris Mason 12402a0f7f57SLi Zefan /* 12412a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12422a0f7f57SLi Zefan * written sequentially. 12432a0f7f57SLi Zefan */ 12442a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12452a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12462a0f7f57SLi Zefan 1247f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1248f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1249f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12504cb5300bSChris Mason /* 12514cb5300bSChris Mason * make sure we stop running if someone unmounts 12524cb5300bSChris Mason * the FS 12534cb5300bSChris Mason */ 12544cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12554cb5300bSChris Mason break; 12564cb5300bSChris Mason 1257210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1258210549ebSDavid Sterba printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); 1259210549ebSDavid Sterba ret = -EAGAIN; 1260210549ebSDavid Sterba break; 1261210549ebSDavid Sterba } 1262210549ebSDavid Sterba 126366c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12646c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1265a43a2111SAndrew Mahone &defrag_end, range->flags & 1266a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1267940100a4SChris Mason unsigned long next; 1268940100a4SChris Mason /* 1269940100a4SChris Mason * the should_defrag function tells us how much to skip 1270940100a4SChris Mason * bump our counter by the suggested amount 1271940100a4SChris Mason */ 1272940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1273940100a4SChris Mason i = max(i + 1, next); 1274940100a4SChris Mason continue; 1275940100a4SChris Mason } 1276008873eaSLi Zefan 1277008873eaSLi Zefan if (!newer_than) { 1278008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1279008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1280008873eaSLi Zefan cluster = min(cluster, max_cluster); 1281008873eaSLi Zefan } else { 1282008873eaSLi Zefan cluster = max_cluster; 1283008873eaSLi Zefan } 1284008873eaSLi Zefan 1285008873eaSLi Zefan if (i + cluster > ra_index) { 1286008873eaSLi Zefan ra_index = max(i, ra_index); 1287008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1288008873eaSLi Zefan cluster); 1289008873eaSLi Zefan ra_index += max_cluster; 1290008873eaSLi Zefan } 12914cb5300bSChris Mason 1292ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1293633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1294633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1295008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1296ecb8bea8SLiu Bo if (ret < 0) { 1297ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12984cb5300bSChris Mason goto out_ra; 1299ecb8bea8SLiu Bo } 13004cb5300bSChris Mason 13014cb5300bSChris Mason defrag_count += ret; 1302d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1303ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13044cb5300bSChris Mason 13054cb5300bSChris Mason if (newer_than) { 13064cb5300bSChris Mason if (newer_off == (u64)-1) 13074cb5300bSChris Mason break; 13084cb5300bSChris Mason 1309e1f041e1SLiu Bo if (ret > 0) 1310e1f041e1SLiu Bo i += ret; 1311e1f041e1SLiu Bo 13124cb5300bSChris Mason newer_off = max(newer_off + 1, 13134cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13144cb5300bSChris Mason 13154cb5300bSChris Mason ret = find_new_extents(root, inode, 13164cb5300bSChris Mason newer_than, &newer_off, 13174cb5300bSChris Mason 64 * 1024); 13184cb5300bSChris Mason if (!ret) { 13194cb5300bSChris Mason range->start = newer_off; 13204cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13214cb5300bSChris Mason } else { 13224cb5300bSChris Mason break; 1323940100a4SChris Mason } 13244cb5300bSChris Mason } else { 1325008873eaSLi Zefan if (ret > 0) { 1326cbcc8326SLi Zefan i += ret; 1327008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1328008873eaSLi Zefan } else { 1329940100a4SChris Mason i++; 1330008873eaSLi Zefan last_len = 0; 1331008873eaSLi Zefan } 1332f46b5a66SChristoph Hellwig } 13334cb5300bSChris Mason } 1334f46b5a66SChristoph Hellwig 13351e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13361e701a32SChris Mason filemap_flush(inode->i_mapping); 13371e701a32SChris Mason 13381e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13391e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13401e701a32SChris Mason * we have to make sure the IO is actually started and that 13411e701a32SChris Mason * ordered extents get created before we return 13421e701a32SChris Mason */ 13431e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13441e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13451e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13461e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13471e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13481e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13491e701a32SChris Mason } 13501e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13511e701a32SChris Mason } 13521e701a32SChris Mason 13531a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13542b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13551a419d85SLi Zefan } 13561a419d85SLi Zefan 135760ccf82fSDiego Calleja ret = defrag_count; 1358940100a4SChris Mason 13594cb5300bSChris Mason out_ra: 1360633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1361633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1362633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1363633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1364633085c7SFilipe David Borba Manana } 13654cb5300bSChris Mason if (!file) 13664cb5300bSChris Mason kfree(ra); 13674cb5300bSChris Mason kfree(pages); 1368940100a4SChris Mason return ret; 1369f46b5a66SChristoph Hellwig } 1370f46b5a66SChristoph Hellwig 1371198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 137276dda93cSYan, Zheng void __user *arg) 1373f46b5a66SChristoph Hellwig { 1374f46b5a66SChristoph Hellwig u64 new_size; 1375f46b5a66SChristoph Hellwig u64 old_size; 1376f46b5a66SChristoph Hellwig u64 devid = 1; 1377496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1378f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1379f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1380f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1381f46b5a66SChristoph Hellwig char *sizestr; 1382f46b5a66SChristoph Hellwig char *devstr = NULL; 1383f46b5a66SChristoph Hellwig int ret = 0; 1384f46b5a66SChristoph Hellwig int mod = 0; 1385f46b5a66SChristoph Hellwig 1386e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1387e441d54dSChris Mason return -EPERM; 1388e441d54dSChris Mason 1389198605a8SMiao Xie ret = mnt_want_write_file(file); 1390198605a8SMiao Xie if (ret) 1391198605a8SMiao Xie return ret; 1392198605a8SMiao Xie 13935ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 13945ac00addSStefan Behrens 1)) { 139597547676SMiao Xie mnt_drop_write_file(file); 1396e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1397c9e9f97bSIlya Dryomov } 1398c9e9f97bSIlya Dryomov 13995ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1400dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1401c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1402c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1403c9e9f97bSIlya Dryomov goto out; 1404c9e9f97bSIlya Dryomov } 14055516e595SMark Fasheh 14065516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1407f46b5a66SChristoph Hellwig 1408f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1409f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1410f46b5a66SChristoph Hellwig if (devstr) { 1411f46b5a66SChristoph Hellwig char *end; 1412f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1413f46b5a66SChristoph Hellwig *devstr = '\0'; 1414f46b5a66SChristoph Hellwig devstr = vol_args->name; 1415f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1416dfd79829SMiao Xie if (!devid) { 1417dfd79829SMiao Xie ret = -EINVAL; 1418dfd79829SMiao Xie goto out_free; 1419dfd79829SMiao Xie } 1420c1c9ff7cSGeert Uytterhoeven printk(KERN_INFO "btrfs: resizing devid %llu\n", devid); 1421f46b5a66SChristoph Hellwig } 1422dba60f3fSMiao Xie 1423aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1424f46b5a66SChristoph Hellwig if (!device) { 14255bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 1426c1c9ff7cSGeert Uytterhoeven devid); 1427dfd79829SMiao Xie ret = -ENODEV; 1428c9e9f97bSIlya Dryomov goto out_free; 1429f46b5a66SChristoph Hellwig } 1430dba60f3fSMiao Xie 1431dba60f3fSMiao Xie if (!device->writeable) { 14324e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1433dba60f3fSMiao Xie "readonly device %llu\n", 1434c1c9ff7cSGeert Uytterhoeven devid); 1435dfd79829SMiao Xie ret = -EPERM; 14364e42ae1bSLiu Bo goto out_free; 14374e42ae1bSLiu Bo } 14384e42ae1bSLiu Bo 1439f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1440f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1441f46b5a66SChristoph Hellwig else { 1442f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1443f46b5a66SChristoph Hellwig mod = -1; 1444f46b5a66SChristoph Hellwig sizestr++; 1445f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1446f46b5a66SChristoph Hellwig mod = 1; 1447f46b5a66SChristoph Hellwig sizestr++; 1448f46b5a66SChristoph Hellwig } 144991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1450f46b5a66SChristoph Hellwig if (new_size == 0) { 1451f46b5a66SChristoph Hellwig ret = -EINVAL; 1452c9e9f97bSIlya Dryomov goto out_free; 1453f46b5a66SChristoph Hellwig } 1454f46b5a66SChristoph Hellwig } 1455f46b5a66SChristoph Hellwig 145663a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1457dfd79829SMiao Xie ret = -EPERM; 145863a212abSStefan Behrens goto out_free; 145963a212abSStefan Behrens } 146063a212abSStefan Behrens 1461f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1462f46b5a66SChristoph Hellwig 1463f46b5a66SChristoph Hellwig if (mod < 0) { 1464f46b5a66SChristoph Hellwig if (new_size > old_size) { 1465f46b5a66SChristoph Hellwig ret = -EINVAL; 1466c9e9f97bSIlya Dryomov goto out_free; 1467f46b5a66SChristoph Hellwig } 1468f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1469f46b5a66SChristoph Hellwig } else if (mod > 0) { 1470f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1471f46b5a66SChristoph Hellwig } 1472f46b5a66SChristoph Hellwig 1473f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1474f46b5a66SChristoph Hellwig ret = -EINVAL; 1475c9e9f97bSIlya Dryomov goto out_free; 1476f46b5a66SChristoph Hellwig } 1477f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1478f46b5a66SChristoph Hellwig ret = -EFBIG; 1479c9e9f97bSIlya Dryomov goto out_free; 1480f46b5a66SChristoph Hellwig } 1481f46b5a66SChristoph Hellwig 1482f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1483f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1484f46b5a66SChristoph Hellwig 1485606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1486c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1487f46b5a66SChristoph Hellwig 1488f46b5a66SChristoph Hellwig if (new_size > old_size) { 1489a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 149098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 149198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1492c9e9f97bSIlya Dryomov goto out_free; 149398d5dc13STsutomu Itoh } 1494f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1495f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1496ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1497f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 14980253f40eSjeff.liu } /* equal, nothing need to do */ 1499f46b5a66SChristoph Hellwig 1500c9e9f97bSIlya Dryomov out_free: 1501f46b5a66SChristoph Hellwig kfree(vol_args); 1502c9e9f97bSIlya Dryomov out: 1503c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15045ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 150518f39c41SIlya Dryomov mnt_drop_write_file(file); 1506f46b5a66SChristoph Hellwig return ret; 1507f46b5a66SChristoph Hellwig } 1508f46b5a66SChristoph Hellwig 150972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15106f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15116f72c7e2SArne Jansen u64 *transid, bool readonly, 15128696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1513f46b5a66SChristoph Hellwig { 1514f46b5a66SChristoph Hellwig int namelen; 15153de4586cSChris Mason int ret = 0; 1516f46b5a66SChristoph Hellwig 1517a874a63eSLiu Bo ret = mnt_want_write_file(file); 1518a874a63eSLiu Bo if (ret) 1519a874a63eSLiu Bo goto out; 1520a874a63eSLiu Bo 152172fd032eSSage Weil namelen = strlen(name); 152272fd032eSSage Weil if (strchr(name, '/')) { 1523f46b5a66SChristoph Hellwig ret = -EINVAL; 1524a874a63eSLiu Bo goto out_drop_write; 1525f46b5a66SChristoph Hellwig } 1526f46b5a66SChristoph Hellwig 152716780cabSChris Mason if (name[0] == '.' && 152816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 152916780cabSChris Mason ret = -EEXIST; 1530a874a63eSLiu Bo goto out_drop_write; 153116780cabSChris Mason } 153216780cabSChris Mason 15333de4586cSChris Mason if (subvol) { 153472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15356f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1536cb8e7090SChristoph Hellwig } else { 15372903ff01SAl Viro struct fd src = fdget(fd); 15383de4586cSChris Mason struct inode *src_inode; 15392903ff01SAl Viro if (!src.file) { 15403de4586cSChris Mason ret = -EINVAL; 1541a874a63eSLiu Bo goto out_drop_write; 15423de4586cSChris Mason } 15433de4586cSChris Mason 1544496ad9aaSAl Viro src_inode = file_inode(src.file); 1545496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1546d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1547d397712bSChris Mason "another FS\n"); 15483de4586cSChris Mason ret = -EINVAL; 1549ecd18815SAl Viro } else { 155072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 155172fd032eSSage Weil BTRFS_I(src_inode)->root, 15526f72c7e2SArne Jansen transid, readonly, inherit); 1553ecd18815SAl Viro } 15542903ff01SAl Viro fdput(src); 1555cb8e7090SChristoph Hellwig } 1556a874a63eSLiu Bo out_drop_write: 1557a874a63eSLiu Bo mnt_drop_write_file(file); 1558f46b5a66SChristoph Hellwig out: 155972fd032eSSage Weil return ret; 156072fd032eSSage Weil } 156172fd032eSSage Weil 156272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1563fa0d2b9bSLi Zefan void __user *arg, int subvol) 156472fd032eSSage Weil { 1565fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 156672fd032eSSage Weil int ret; 156772fd032eSSage Weil 1568fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1569fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1570fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1571fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1572fa0d2b9bSLi Zefan 1573fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1574b83cc969SLi Zefan vol_args->fd, subvol, 15756f72c7e2SArne Jansen NULL, false, NULL); 1576fa0d2b9bSLi Zefan 1577fa0d2b9bSLi Zefan kfree(vol_args); 1578fa0d2b9bSLi Zefan return ret; 1579fa0d2b9bSLi Zefan } 1580fa0d2b9bSLi Zefan 1581fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1582fa0d2b9bSLi Zefan void __user *arg, int subvol) 1583fa0d2b9bSLi Zefan { 1584fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1585fa0d2b9bSLi Zefan int ret; 1586fdfb1e4fSLi Zefan u64 transid = 0; 1587fdfb1e4fSLi Zefan u64 *ptr = NULL; 1588b83cc969SLi Zefan bool readonly = false; 15896f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 159072fd032eSSage Weil 1591fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1592fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1593fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1594fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1595fdfb1e4fSLi Zefan 1596b83cc969SLi Zefan if (vol_args->flags & 15976f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15986f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1599b83cc969SLi Zefan ret = -EOPNOTSUPP; 1600fdfb1e4fSLi Zefan goto out; 1601fdfb1e4fSLi Zefan } 1602fdfb1e4fSLi Zefan 1603fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1604fdfb1e4fSLi Zefan ptr = &transid; 1605b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1606b83cc969SLi Zefan readonly = true; 16076f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16086f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16096f72c7e2SArne Jansen ret = -EINVAL; 16106f72c7e2SArne Jansen goto out; 16116f72c7e2SArne Jansen } 16126f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16136f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16146f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16156f72c7e2SArne Jansen goto out; 16166f72c7e2SArne Jansen } 16176f72c7e2SArne Jansen } 161875eaa0e2SSage Weil 1619fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16206f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16218696c533SMiao Xie readonly, inherit); 162275eaa0e2SSage Weil 1623fdfb1e4fSLi Zefan if (ret == 0 && ptr && 162475eaa0e2SSage Weil copy_to_user(arg + 1625fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1626fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 162775eaa0e2SSage Weil ret = -EFAULT; 1628fdfb1e4fSLi Zefan out: 1629f46b5a66SChristoph Hellwig kfree(vol_args); 16306f72c7e2SArne Jansen kfree(inherit); 1631f46b5a66SChristoph Hellwig return ret; 1632f46b5a66SChristoph Hellwig } 1633f46b5a66SChristoph Hellwig 16340caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16350caa102dSLi Zefan void __user *arg) 16360caa102dSLi Zefan { 1637496ad9aaSAl Viro struct inode *inode = file_inode(file); 16380caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16390caa102dSLi Zefan int ret = 0; 16400caa102dSLi Zefan u64 flags = 0; 16410caa102dSLi Zefan 164233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16430caa102dSLi Zefan return -EINVAL; 16440caa102dSLi Zefan 16450caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16460caa102dSLi Zefan if (btrfs_root_readonly(root)) 16470caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16480caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16490caa102dSLi Zefan 16500caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16510caa102dSLi Zefan ret = -EFAULT; 16520caa102dSLi Zefan 16530caa102dSLi Zefan return ret; 16540caa102dSLi Zefan } 16550caa102dSLi Zefan 16560caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16570caa102dSLi Zefan void __user *arg) 16580caa102dSLi Zefan { 1659496ad9aaSAl Viro struct inode *inode = file_inode(file); 16600caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16610caa102dSLi Zefan struct btrfs_trans_handle *trans; 16620caa102dSLi Zefan u64 root_flags; 16630caa102dSLi Zefan u64 flags; 16640caa102dSLi Zefan int ret = 0; 16650caa102dSLi Zefan 1666b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1667b9ca0664SLiu Bo if (ret) 1668b9ca0664SLiu Bo goto out; 16690caa102dSLi Zefan 1670b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1671b9ca0664SLiu Bo ret = -EINVAL; 1672b9ca0664SLiu Bo goto out_drop_write; 1673b9ca0664SLiu Bo } 16740caa102dSLi Zefan 1675b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1676b9ca0664SLiu Bo ret = -EFAULT; 1677b9ca0664SLiu Bo goto out_drop_write; 1678b9ca0664SLiu Bo } 16790caa102dSLi Zefan 1680b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1681b9ca0664SLiu Bo ret = -EINVAL; 1682b9ca0664SLiu Bo goto out_drop_write; 1683b9ca0664SLiu Bo } 16840caa102dSLi Zefan 1685b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1686b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1687b9ca0664SLiu Bo goto out_drop_write; 1688b9ca0664SLiu Bo } 16890caa102dSLi Zefan 1690b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1691b9ca0664SLiu Bo ret = -EACCES; 1692b9ca0664SLiu Bo goto out_drop_write; 1693b9ca0664SLiu Bo } 1694b4dc2b8cSLi Zefan 16950caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16960caa102dSLi Zefan 16970caa102dSLi Zefan /* nothing to do */ 16980caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1699b9ca0664SLiu Bo goto out_drop_sem; 17000caa102dSLi Zefan 17010caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17020caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 17030caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17040caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17050caa102dSLi Zefan else 17060caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17070caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17080caa102dSLi Zefan 17090caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17100caa102dSLi Zefan if (IS_ERR(trans)) { 17110caa102dSLi Zefan ret = PTR_ERR(trans); 17120caa102dSLi Zefan goto out_reset; 17130caa102dSLi Zefan } 17140caa102dSLi Zefan 1715b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17160caa102dSLi Zefan &root->root_key, &root->root_item); 17170caa102dSLi Zefan 17180caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17190caa102dSLi Zefan out_reset: 17200caa102dSLi Zefan if (ret) 17210caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1722b9ca0664SLiu Bo out_drop_sem: 17230caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1724b9ca0664SLiu Bo out_drop_write: 1725b9ca0664SLiu Bo mnt_drop_write_file(file); 1726b9ca0664SLiu Bo out: 17270caa102dSLi Zefan return ret; 17280caa102dSLi Zefan } 17290caa102dSLi Zefan 173076dda93cSYan, Zheng /* 173176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 173276dda93cSYan, Zheng */ 173376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 173476dda93cSYan, Zheng { 173576dda93cSYan, Zheng struct btrfs_path *path; 1736175a2b87SJosef Bacik struct btrfs_dir_item *di; 173776dda93cSYan, Zheng struct btrfs_key key; 1738175a2b87SJosef Bacik u64 dir_id; 173976dda93cSYan, Zheng int ret; 174076dda93cSYan, Zheng 174176dda93cSYan, Zheng path = btrfs_alloc_path(); 174276dda93cSYan, Zheng if (!path) 174376dda93cSYan, Zheng return -ENOMEM; 174476dda93cSYan, Zheng 1745175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1746175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1747175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1748175a2b87SJosef Bacik dir_id, "default", 7, 0); 1749175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1750175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1751175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1752175a2b87SJosef Bacik ret = -ENOTEMPTY; 1753175a2b87SJosef Bacik goto out; 1754175a2b87SJosef Bacik } 1755175a2b87SJosef Bacik btrfs_release_path(path); 1756175a2b87SJosef Bacik } 1757175a2b87SJosef Bacik 175876dda93cSYan, Zheng key.objectid = root->root_key.objectid; 175976dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 176076dda93cSYan, Zheng key.offset = (u64)-1; 176176dda93cSYan, Zheng 176276dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 176376dda93cSYan, Zheng &key, path, 0, 0); 176476dda93cSYan, Zheng if (ret < 0) 176576dda93cSYan, Zheng goto out; 176676dda93cSYan, Zheng BUG_ON(ret == 0); 176776dda93cSYan, Zheng 176876dda93cSYan, Zheng ret = 0; 176976dda93cSYan, Zheng if (path->slots[0] > 0) { 177076dda93cSYan, Zheng path->slots[0]--; 177176dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 177276dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 177376dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 177476dda93cSYan, Zheng ret = -ENOTEMPTY; 177576dda93cSYan, Zheng } 177676dda93cSYan, Zheng out: 177776dda93cSYan, Zheng btrfs_free_path(path); 177876dda93cSYan, Zheng return ret; 177976dda93cSYan, Zheng } 178076dda93cSYan, Zheng 1781ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1782ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1783ac8e9819SChris Mason { 1784abc6e134SChris Mason struct btrfs_key test; 1785abc6e134SChris Mason int ret; 1786abc6e134SChris Mason 1787abc6e134SChris Mason test.objectid = sk->min_objectid; 1788abc6e134SChris Mason test.type = sk->min_type; 1789abc6e134SChris Mason test.offset = sk->min_offset; 1790abc6e134SChris Mason 1791abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1792abc6e134SChris Mason if (ret < 0) 1793ac8e9819SChris Mason return 0; 1794abc6e134SChris Mason 1795abc6e134SChris Mason test.objectid = sk->max_objectid; 1796abc6e134SChris Mason test.type = sk->max_type; 1797abc6e134SChris Mason test.offset = sk->max_offset; 1798abc6e134SChris Mason 1799abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1800abc6e134SChris Mason if (ret > 0) 1801ac8e9819SChris Mason return 0; 1802ac8e9819SChris Mason return 1; 1803ac8e9819SChris Mason } 1804ac8e9819SChris Mason 1805ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1806ac8e9819SChris Mason struct btrfs_path *path, 1807ac8e9819SChris Mason struct btrfs_key *key, 1808ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1809ac8e9819SChris Mason char *buf, 1810ac8e9819SChris Mason unsigned long *sk_offset, 1811ac8e9819SChris Mason int *num_found) 1812ac8e9819SChris Mason { 1813ac8e9819SChris Mason u64 found_transid; 1814ac8e9819SChris Mason struct extent_buffer *leaf; 1815ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1816ac8e9819SChris Mason unsigned long item_off; 1817ac8e9819SChris Mason unsigned long item_len; 1818ac8e9819SChris Mason int nritems; 1819ac8e9819SChris Mason int i; 1820ac8e9819SChris Mason int slot; 1821ac8e9819SChris Mason int ret = 0; 1822ac8e9819SChris Mason 1823ac8e9819SChris Mason leaf = path->nodes[0]; 1824ac8e9819SChris Mason slot = path->slots[0]; 1825ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1826ac8e9819SChris Mason 1827ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1828ac8e9819SChris Mason i = nritems; 1829ac8e9819SChris Mason goto advance_key; 1830ac8e9819SChris Mason } 1831ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1832ac8e9819SChris Mason 1833ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1834ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1835ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1836ac8e9819SChris Mason 183703b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 183803b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 183903b71c6cSGabriel de Perthuis continue; 184003b71c6cSGabriel de Perthuis 184103b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1842ac8e9819SChris Mason item_len = 0; 1843ac8e9819SChris Mason 1844ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1845ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1846ac8e9819SChris Mason ret = 1; 1847ac8e9819SChris Mason goto overflow; 1848ac8e9819SChris Mason } 1849ac8e9819SChris Mason 1850ac8e9819SChris Mason sh.objectid = key->objectid; 1851ac8e9819SChris Mason sh.offset = key->offset; 1852ac8e9819SChris Mason sh.type = key->type; 1853ac8e9819SChris Mason sh.len = item_len; 1854ac8e9819SChris Mason sh.transid = found_transid; 1855ac8e9819SChris Mason 1856ac8e9819SChris Mason /* copy search result header */ 1857ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1858ac8e9819SChris Mason *sk_offset += sizeof(sh); 1859ac8e9819SChris Mason 1860ac8e9819SChris Mason if (item_len) { 1861ac8e9819SChris Mason char *p = buf + *sk_offset; 1862ac8e9819SChris Mason /* copy the item */ 1863ac8e9819SChris Mason read_extent_buffer(leaf, p, 1864ac8e9819SChris Mason item_off, item_len); 1865ac8e9819SChris Mason *sk_offset += item_len; 1866ac8e9819SChris Mason } 1867e2156867SHugo Mills (*num_found)++; 1868ac8e9819SChris Mason 1869ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1870ac8e9819SChris Mason break; 1871ac8e9819SChris Mason } 1872ac8e9819SChris Mason advance_key: 1873ac8e9819SChris Mason ret = 0; 1874abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1875abc6e134SChris Mason key->offset++; 1876abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1877abc6e134SChris Mason key->offset = 0; 1878abc6e134SChris Mason key->type++; 1879abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1880abc6e134SChris Mason key->offset = 0; 1881abc6e134SChris Mason key->type = 0; 1882abc6e134SChris Mason key->objectid++; 1883abc6e134SChris Mason } else 1884abc6e134SChris Mason ret = 1; 1885ac8e9819SChris Mason overflow: 1886ac8e9819SChris Mason return ret; 1887ac8e9819SChris Mason } 1888ac8e9819SChris Mason 1889ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1890ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1891ac8e9819SChris Mason { 1892ac8e9819SChris Mason struct btrfs_root *root; 1893ac8e9819SChris Mason struct btrfs_key key; 1894ac8e9819SChris Mason struct btrfs_path *path; 1895ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1896ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1897ac8e9819SChris Mason int ret; 1898ac8e9819SChris Mason int num_found = 0; 1899ac8e9819SChris Mason unsigned long sk_offset = 0; 1900ac8e9819SChris Mason 1901ac8e9819SChris Mason path = btrfs_alloc_path(); 1902ac8e9819SChris Mason if (!path) 1903ac8e9819SChris Mason return -ENOMEM; 1904ac8e9819SChris Mason 1905ac8e9819SChris Mason if (sk->tree_id == 0) { 1906ac8e9819SChris Mason /* search the root of the inode that was passed */ 1907ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1908ac8e9819SChris Mason } else { 1909ac8e9819SChris Mason key.objectid = sk->tree_id; 1910ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1911ac8e9819SChris Mason key.offset = (u64)-1; 1912ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1913ac8e9819SChris Mason if (IS_ERR(root)) { 1914ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1915ac8e9819SChris Mason sk->tree_id); 1916ac8e9819SChris Mason btrfs_free_path(path); 1917ac8e9819SChris Mason return -ENOENT; 1918ac8e9819SChris Mason } 1919ac8e9819SChris Mason } 1920ac8e9819SChris Mason 1921ac8e9819SChris Mason key.objectid = sk->min_objectid; 1922ac8e9819SChris Mason key.type = sk->min_type; 1923ac8e9819SChris Mason key.offset = sk->min_offset; 1924ac8e9819SChris Mason 1925ac8e9819SChris Mason path->keep_locks = 1; 1926ac8e9819SChris Mason 1927ac8e9819SChris Mason while (1) { 19286174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1929ac8e9819SChris Mason if (ret != 0) { 1930ac8e9819SChris Mason if (ret > 0) 1931ac8e9819SChris Mason ret = 0; 1932ac8e9819SChris Mason goto err; 1933ac8e9819SChris Mason } 1934ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1935ac8e9819SChris Mason &sk_offset, &num_found); 1936b3b4aa74SDavid Sterba btrfs_release_path(path); 1937ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1938ac8e9819SChris Mason break; 1939ac8e9819SChris Mason 1940ac8e9819SChris Mason } 1941ac8e9819SChris Mason ret = 0; 1942ac8e9819SChris Mason err: 1943ac8e9819SChris Mason sk->nr_items = num_found; 1944ac8e9819SChris Mason btrfs_free_path(path); 1945ac8e9819SChris Mason return ret; 1946ac8e9819SChris Mason } 1947ac8e9819SChris Mason 1948ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1949ac8e9819SChris Mason void __user *argp) 1950ac8e9819SChris Mason { 1951ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1952ac8e9819SChris Mason struct inode *inode; 1953ac8e9819SChris Mason int ret; 1954ac8e9819SChris Mason 1955ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1956ac8e9819SChris Mason return -EPERM; 1957ac8e9819SChris Mason 19582354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19592354d08fSJulia Lawall if (IS_ERR(args)) 19602354d08fSJulia Lawall return PTR_ERR(args); 1961ac8e9819SChris Mason 1962496ad9aaSAl Viro inode = file_inode(file); 1963ac8e9819SChris Mason ret = search_ioctl(inode, args); 1964ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1965ac8e9819SChris Mason ret = -EFAULT; 1966ac8e9819SChris Mason kfree(args); 1967ac8e9819SChris Mason return ret; 1968ac8e9819SChris Mason } 1969ac8e9819SChris Mason 197098d377a0STARUISI Hiroaki /* 1971ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1972ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 197398d377a0STARUISI Hiroaki */ 197498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 197598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 197698d377a0STARUISI Hiroaki { 197798d377a0STARUISI Hiroaki struct btrfs_root *root; 197898d377a0STARUISI Hiroaki struct btrfs_key key; 1979ac8e9819SChris Mason char *ptr; 198098d377a0STARUISI Hiroaki int ret = -1; 198198d377a0STARUISI Hiroaki int slot; 198298d377a0STARUISI Hiroaki int len; 198398d377a0STARUISI Hiroaki int total_len = 0; 198498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 198598d377a0STARUISI Hiroaki struct extent_buffer *l; 198698d377a0STARUISI Hiroaki struct btrfs_path *path; 198798d377a0STARUISI Hiroaki 198898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 198998d377a0STARUISI Hiroaki name[0]='\0'; 199098d377a0STARUISI Hiroaki return 0; 199198d377a0STARUISI Hiroaki } 199298d377a0STARUISI Hiroaki 199398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 199498d377a0STARUISI Hiroaki if (!path) 199598d377a0STARUISI Hiroaki return -ENOMEM; 199698d377a0STARUISI Hiroaki 1997ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 199898d377a0STARUISI Hiroaki 199998d377a0STARUISI Hiroaki key.objectid = tree_id; 200098d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 200198d377a0STARUISI Hiroaki key.offset = (u64)-1; 200298d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 200398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 200498d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 20058ad6fcabSChris Mason ret = -ENOENT; 20068ad6fcabSChris Mason goto out; 200798d377a0STARUISI Hiroaki } 200898d377a0STARUISI Hiroaki 200998d377a0STARUISI Hiroaki key.objectid = dirid; 201098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20118ad6fcabSChris Mason key.offset = (u64)-1; 201298d377a0STARUISI Hiroaki 201398d377a0STARUISI Hiroaki while (1) { 201498d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 201598d377a0STARUISI Hiroaki if (ret < 0) 201698d377a0STARUISI Hiroaki goto out; 201718674c6cSFilipe David Borba Manana else if (ret > 0) { 201818674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 201918674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 202018674c6cSFilipe David Borba Manana if (ret < 0) 202118674c6cSFilipe David Borba Manana goto out; 202218674c6cSFilipe David Borba Manana else if (ret > 0) { 2023ac8e9819SChris Mason ret = -ENOENT; 202498d377a0STARUISI Hiroaki goto out; 2025ac8e9819SChris Mason } 202618674c6cSFilipe David Borba Manana } 202718674c6cSFilipe David Borba Manana 202818674c6cSFilipe David Borba Manana l = path->nodes[0]; 202918674c6cSFilipe David Borba Manana slot = path->slots[0]; 203018674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 203198d377a0STARUISI Hiroaki 203298d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 203398d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 203498d377a0STARUISI Hiroaki ptr -= len + 1; 203598d377a0STARUISI Hiroaki total_len += len + 1; 2036a696cf35SFilipe David Borba Manana if (ptr < name) { 2037a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 203898d377a0STARUISI Hiroaki goto out; 2039a696cf35SFilipe David Borba Manana } 204098d377a0STARUISI Hiroaki 204198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 204298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 204398d377a0STARUISI Hiroaki 204498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 204598d377a0STARUISI Hiroaki break; 204698d377a0STARUISI Hiroaki 2047b3b4aa74SDavid Sterba btrfs_release_path(path); 204898d377a0STARUISI Hiroaki key.objectid = key.offset; 20498ad6fcabSChris Mason key.offset = (u64)-1; 205098d377a0STARUISI Hiroaki dirid = key.objectid; 205198d377a0STARUISI Hiroaki } 205277906a50SLi Zefan memmove(name, ptr, total_len); 205398d377a0STARUISI Hiroaki name[total_len] = '\0'; 205498d377a0STARUISI Hiroaki ret = 0; 205598d377a0STARUISI Hiroaki out: 205698d377a0STARUISI Hiroaki btrfs_free_path(path); 2057ac8e9819SChris Mason return ret; 2058ac8e9819SChris Mason } 2059ac8e9819SChris Mason 2060ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2061ac8e9819SChris Mason void __user *argp) 2062ac8e9819SChris Mason { 2063ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2064ac8e9819SChris Mason struct inode *inode; 2065ac8e9819SChris Mason int ret; 2066ac8e9819SChris Mason 2067ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2068ac8e9819SChris Mason return -EPERM; 2069ac8e9819SChris Mason 20702354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20712354d08fSJulia Lawall if (IS_ERR(args)) 20722354d08fSJulia Lawall return PTR_ERR(args); 2073c2b96929SDan Carpenter 2074496ad9aaSAl Viro inode = file_inode(file); 2075ac8e9819SChris Mason 20761b53ac4dSChris Mason if (args->treeid == 0) 20771b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 20781b53ac4dSChris Mason 2079ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2080ac8e9819SChris Mason args->treeid, args->objectid, 2081ac8e9819SChris Mason args->name); 2082ac8e9819SChris Mason 2083ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2084ac8e9819SChris Mason ret = -EFAULT; 2085ac8e9819SChris Mason 2086ac8e9819SChris Mason kfree(args); 208798d377a0STARUISI Hiroaki return ret; 208898d377a0STARUISI Hiroaki } 208998d377a0STARUISI Hiroaki 209076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 209176dda93cSYan, Zheng void __user *arg) 209276dda93cSYan, Zheng { 209354563d41SAl Viro struct dentry *parent = file->f_path.dentry; 209476dda93cSYan, Zheng struct dentry *dentry; 209576dda93cSYan, Zheng struct inode *dir = parent->d_inode; 209676dda93cSYan, Zheng struct inode *inode; 209776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 209876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 209976dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 210076dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2101c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2102c58aaad2SMiao Xie u64 qgroup_reserved; 210376dda93cSYan, Zheng int namelen; 210476dda93cSYan, Zheng int ret; 210576dda93cSYan, Zheng int err = 0; 210676dda93cSYan, Zheng 210776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 210876dda93cSYan, Zheng if (IS_ERR(vol_args)) 210976dda93cSYan, Zheng return PTR_ERR(vol_args); 211076dda93cSYan, Zheng 211176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 211276dda93cSYan, Zheng namelen = strlen(vol_args->name); 211376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 211476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 211576dda93cSYan, Zheng err = -EINVAL; 211676dda93cSYan, Zheng goto out; 211776dda93cSYan, Zheng } 211876dda93cSYan, Zheng 2119a561be71SAl Viro err = mnt_want_write_file(file); 212076dda93cSYan, Zheng if (err) 212176dda93cSYan, Zheng goto out; 212276dda93cSYan, Zheng 21235c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21245c50c9b8SDavid Sterba if (err == -EINTR) 2125e43f998eSDavid Sterba goto out_drop_write; 212676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 212776dda93cSYan, Zheng if (IS_ERR(dentry)) { 212876dda93cSYan, Zheng err = PTR_ERR(dentry); 212976dda93cSYan, Zheng goto out_unlock_dir; 213076dda93cSYan, Zheng } 213176dda93cSYan, Zheng 213276dda93cSYan, Zheng if (!dentry->d_inode) { 213376dda93cSYan, Zheng err = -ENOENT; 213476dda93cSYan, Zheng goto out_dput; 213576dda93cSYan, Zheng } 213676dda93cSYan, Zheng 213776dda93cSYan, Zheng inode = dentry->d_inode; 21384260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21394260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 21404260f7c7SSage Weil /* 21414260f7c7SSage Weil * Regular user. Only allow this with a special mount 21424260f7c7SSage Weil * option, when the user has write+exec access to the 21434260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21444260f7c7SSage Weil * allowed. 21454260f7c7SSage Weil * 21464260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21474260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21484260f7c7SSage Weil * otherwise be able to delete. 21494260f7c7SSage Weil * 21504260f7c7SSage Weil * Users who want to delete empty subvols should try 21514260f7c7SSage Weil * rmdir(2). 21524260f7c7SSage Weil */ 21534260f7c7SSage Weil err = -EPERM; 21544260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21554260f7c7SSage Weil goto out_dput; 21564260f7c7SSage Weil 21574260f7c7SSage Weil /* 21584260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 21594260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 21604260f7c7SSage Weil * must be called on the dentry referencing the root 21614260f7c7SSage Weil * of the subvol, not a random directory contained 21624260f7c7SSage Weil * within it. 21634260f7c7SSage Weil */ 21644260f7c7SSage Weil err = -EINVAL; 21654260f7c7SSage Weil if (root == dest) 21664260f7c7SSage Weil goto out_dput; 21674260f7c7SSage Weil 21684260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 21694260f7c7SSage Weil if (err) 21704260f7c7SSage Weil goto out_dput; 21715c39da5bSMiao Xie } 21724260f7c7SSage Weil 21735c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 21744260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 21754260f7c7SSage Weil if (err) 21764260f7c7SSage Weil goto out_dput; 21774260f7c7SSage Weil 217833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 217976dda93cSYan, Zheng err = -EINVAL; 218076dda93cSYan, Zheng goto out_dput; 218176dda93cSYan, Zheng } 218276dda93cSYan, Zheng 218376dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 218476dda93cSYan, Zheng err = d_invalidate(dentry); 218576dda93cSYan, Zheng if (err) 218676dda93cSYan, Zheng goto out_unlock; 218776dda93cSYan, Zheng 218876dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 218976dda93cSYan, Zheng 219076dda93cSYan, Zheng err = may_destroy_subvol(dest); 219176dda93cSYan, Zheng if (err) 219276dda93cSYan, Zheng goto out_up_write; 219376dda93cSYan, Zheng 2194c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2195c58aaad2SMiao Xie /* 2196c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2197c58aaad2SMiao Xie * ref/backref. 2198c58aaad2SMiao Xie */ 2199c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2200ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2201c58aaad2SMiao Xie if (err) 2202c58aaad2SMiao Xie goto out_up_write; 2203c58aaad2SMiao Xie 2204a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2205a22285a6SYan, Zheng if (IS_ERR(trans)) { 2206a22285a6SYan, Zheng err = PTR_ERR(trans); 2207c58aaad2SMiao Xie goto out_release; 2208a22285a6SYan, Zheng } 2209c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2210c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2211a22285a6SYan, Zheng 221276dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 221376dda93cSYan, Zheng dest->root_key.objectid, 221476dda93cSYan, Zheng dentry->d_name.name, 221576dda93cSYan, Zheng dentry->d_name.len); 221679787eaaSJeff Mahoney if (ret) { 221779787eaaSJeff Mahoney err = ret; 221879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 221979787eaaSJeff Mahoney goto out_end_trans; 222079787eaaSJeff Mahoney } 222176dda93cSYan, Zheng 222276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 222376dda93cSYan, Zheng 222476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 222576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 222676dda93cSYan, Zheng dest->root_item.drop_level = 0; 222776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 222876dda93cSYan, Zheng 2229d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 223076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 223176dda93cSYan, Zheng root->fs_info->tree_root, 223276dda93cSYan, Zheng dest->root_key.objectid); 223379787eaaSJeff Mahoney if (ret) { 223479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 223579787eaaSJeff Mahoney err = ret; 223679787eaaSJeff Mahoney goto out_end_trans; 2237d68fc57bSYan, Zheng } 223879787eaaSJeff Mahoney } 2239dd5f9615SStefan Behrens 2240dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2241dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2242dd5f9615SStefan Behrens dest->root_key.objectid); 2243dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2244dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2245dd5f9615SStefan Behrens err = ret; 2246dd5f9615SStefan Behrens goto out_end_trans; 2247dd5f9615SStefan Behrens } 2248dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2249dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2250dd5f9615SStefan Behrens dest->root_item.received_uuid, 2251dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2252dd5f9615SStefan Behrens dest->root_key.objectid); 2253dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2254dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2255dd5f9615SStefan Behrens err = ret; 2256dd5f9615SStefan Behrens goto out_end_trans; 2257dd5f9615SStefan Behrens } 2258dd5f9615SStefan Behrens } 2259dd5f9615SStefan Behrens 226079787eaaSJeff Mahoney out_end_trans: 2261c58aaad2SMiao Xie trans->block_rsv = NULL; 2262c58aaad2SMiao Xie trans->bytes_reserved = 0; 2263531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 226479787eaaSJeff Mahoney if (ret && !err) 226579787eaaSJeff Mahoney err = ret; 226676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2267c58aaad2SMiao Xie out_release: 2268c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 226976dda93cSYan, Zheng out_up_write: 227076dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 227176dda93cSYan, Zheng out_unlock: 227276dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 227376dda93cSYan, Zheng if (!err) { 2274efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 227576dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 227676dda93cSYan, Zheng d_delete(dentry); 2277fa6ac876SLiu Bo 2278fa6ac876SLiu Bo /* the last ref */ 2279fa6ac876SLiu Bo if (dest->cache_inode) { 2280fa6ac876SLiu Bo iput(dest->cache_inode); 2281fa6ac876SLiu Bo dest->cache_inode = NULL; 2282fa6ac876SLiu Bo } 228376dda93cSYan, Zheng } 228476dda93cSYan, Zheng out_dput: 228576dda93cSYan, Zheng dput(dentry); 228676dda93cSYan, Zheng out_unlock_dir: 228776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2288e43f998eSDavid Sterba out_drop_write: 22892a79f17eSAl Viro mnt_drop_write_file(file); 229076dda93cSYan, Zheng out: 229176dda93cSYan, Zheng kfree(vol_args); 229276dda93cSYan, Zheng return err; 229376dda93cSYan, Zheng } 229476dda93cSYan, Zheng 22951e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2296f46b5a66SChristoph Hellwig { 2297496ad9aaSAl Viro struct inode *inode = file_inode(file); 2298f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 22991e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2300c146afadSYan Zheng int ret; 2301c146afadSYan Zheng 230225122d15SIlya Dryomov ret = mnt_want_write_file(file); 230325122d15SIlya Dryomov if (ret) 230425122d15SIlya Dryomov return ret; 2305b83cc969SLi Zefan 230625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 230725122d15SIlya Dryomov ret = -EROFS; 230825122d15SIlya Dryomov goto out; 23095ac00addSStefan Behrens } 2310f46b5a66SChristoph Hellwig 2311f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2312f46b5a66SChristoph Hellwig case S_IFDIR: 2313e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2314e441d54dSChris Mason ret = -EPERM; 2315e441d54dSChris Mason goto out; 2316e441d54dSChris Mason } 2317de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23188929ecfaSYan, Zheng if (ret) 23198929ecfaSYan, Zheng goto out; 2320de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2321f46b5a66SChristoph Hellwig break; 2322f46b5a66SChristoph Hellwig case S_IFREG: 2323e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2324e441d54dSChris Mason ret = -EINVAL; 2325e441d54dSChris Mason goto out; 2326e441d54dSChris Mason } 23271e701a32SChris Mason 23281e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 23291e701a32SChris Mason if (!range) { 23301e701a32SChris Mason ret = -ENOMEM; 23311e701a32SChris Mason goto out; 23321e701a32SChris Mason } 23331e701a32SChris Mason 23341e701a32SChris Mason if (argp) { 23351e701a32SChris Mason if (copy_from_user(range, argp, 23361e701a32SChris Mason sizeof(*range))) { 23371e701a32SChris Mason ret = -EFAULT; 23381e701a32SChris Mason kfree(range); 2339683be16eSDan Carpenter goto out; 23401e701a32SChris Mason } 23411e701a32SChris Mason /* compression requires us to start the IO */ 23421e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 23431e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 23441e701a32SChris Mason range->extent_thresh = (u32)-1; 23451e701a32SChris Mason } 23461e701a32SChris Mason } else { 23471e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23481e701a32SChris Mason range->len = (u64)-1; 23491e701a32SChris Mason } 2350496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23514cb5300bSChris Mason range, 0, 0); 23524cb5300bSChris Mason if (ret > 0) 23534cb5300bSChris Mason ret = 0; 23541e701a32SChris Mason kfree(range); 2355f46b5a66SChristoph Hellwig break; 23568929ecfaSYan, Zheng default: 23578929ecfaSYan, Zheng ret = -EINVAL; 2358f46b5a66SChristoph Hellwig } 2359e441d54dSChris Mason out: 236025122d15SIlya Dryomov mnt_drop_write_file(file); 2361e441d54dSChris Mason return ret; 2362f46b5a66SChristoph Hellwig } 2363f46b5a66SChristoph Hellwig 2364b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2365f46b5a66SChristoph Hellwig { 2366f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2367f46b5a66SChristoph Hellwig int ret; 2368f46b5a66SChristoph Hellwig 2369e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2370e441d54dSChris Mason return -EPERM; 2371e441d54dSChris Mason 23725ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 23735ac00addSStefan Behrens 1)) { 2374e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2375c9e9f97bSIlya Dryomov } 2376c9e9f97bSIlya Dryomov 23775ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2378dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2379c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2380c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2381c9e9f97bSIlya Dryomov goto out; 2382c9e9f97bSIlya Dryomov } 2383f46b5a66SChristoph Hellwig 23845516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2385f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2386f46b5a66SChristoph Hellwig 2387f46b5a66SChristoph Hellwig kfree(vol_args); 2388c9e9f97bSIlya Dryomov out: 2389c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 23905ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2391f46b5a66SChristoph Hellwig return ret; 2392f46b5a66SChristoph Hellwig } 2393f46b5a66SChristoph Hellwig 2394da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2395f46b5a66SChristoph Hellwig { 2396496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2397f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2398f46b5a66SChristoph Hellwig int ret; 2399f46b5a66SChristoph Hellwig 2400e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2401e441d54dSChris Mason return -EPERM; 2402e441d54dSChris Mason 2403da24927bSMiao Xie ret = mnt_want_write_file(file); 2404da24927bSMiao Xie if (ret) 2405da24927bSMiao Xie return ret; 2406c146afadSYan Zheng 2407dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2408c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2409c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2410c9e9f97bSIlya Dryomov goto out; 2411c9e9f97bSIlya Dryomov } 2412f46b5a66SChristoph Hellwig 24135516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2414f46b5a66SChristoph Hellwig 2415183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2416183860f6SAnand Jain 1)) { 2417183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2418183860f6SAnand Jain goto out; 2419183860f6SAnand Jain } 2420183860f6SAnand Jain 2421183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2422183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2423c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24245ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2425183860f6SAnand Jain 2426183860f6SAnand Jain out: 2427183860f6SAnand Jain kfree(vol_args); 24284ac20c70SIlya Dryomov mnt_drop_write_file(file); 2429f46b5a66SChristoph Hellwig return ret; 2430f46b5a66SChristoph Hellwig } 2431f46b5a66SChristoph Hellwig 2432475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2433475f6387SJan Schmidt { 2434027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2435475f6387SJan Schmidt struct btrfs_device *device; 2436475f6387SJan Schmidt struct btrfs_device *next; 2437475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2438027ed2f0SLi Zefan int ret = 0; 2439475f6387SJan Schmidt 2440475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2441475f6387SJan Schmidt return -EPERM; 2442475f6387SJan Schmidt 2443027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2444027ed2f0SLi Zefan if (!fi_args) 2445027ed2f0SLi Zefan return -ENOMEM; 2446027ed2f0SLi Zefan 2447f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2448027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2449027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2450475f6387SJan Schmidt 2451475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2452027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2453027ed2f0SLi Zefan fi_args->max_id = device->devid; 2454475f6387SJan Schmidt } 2455475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2456475f6387SJan Schmidt 2457027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2458027ed2f0SLi Zefan ret = -EFAULT; 2459475f6387SJan Schmidt 2460027ed2f0SLi Zefan kfree(fi_args); 2461027ed2f0SLi Zefan return ret; 2462475f6387SJan Schmidt } 2463475f6387SJan Schmidt 2464475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2465475f6387SJan Schmidt { 2466475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2467475f6387SJan Schmidt struct btrfs_device *dev; 2468475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2469475f6387SJan Schmidt int ret = 0; 2470475f6387SJan Schmidt char *s_uuid = NULL; 2471475f6387SJan Schmidt 2472475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2473475f6387SJan Schmidt return -EPERM; 2474475f6387SJan Schmidt 2475475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2476475f6387SJan Schmidt if (IS_ERR(di_args)) 2477475f6387SJan Schmidt return PTR_ERR(di_args); 2478475f6387SJan Schmidt 2479dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2480475f6387SJan Schmidt s_uuid = di_args->uuid; 2481475f6387SJan Schmidt 2482475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2483aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2484475f6387SJan Schmidt 2485475f6387SJan Schmidt if (!dev) { 2486475f6387SJan Schmidt ret = -ENODEV; 2487475f6387SJan Schmidt goto out; 2488475f6387SJan Schmidt } 2489475f6387SJan Schmidt 2490475f6387SJan Schmidt di_args->devid = dev->devid; 2491475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2492475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2493475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2494a27202fbSJim Meyering if (dev->name) { 2495606686eeSJosef Bacik struct rcu_string *name; 2496606686eeSJosef Bacik 2497606686eeSJosef Bacik rcu_read_lock(); 2498606686eeSJosef Bacik name = rcu_dereference(dev->name); 2499606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2500606686eeSJosef Bacik rcu_read_unlock(); 2501a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2502a27202fbSJim Meyering } else { 250399ba55adSStefan Behrens di_args->path[0] = '\0'; 2504a27202fbSJim Meyering } 2505475f6387SJan Schmidt 2506475f6387SJan Schmidt out: 250755793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2508475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2509475f6387SJan Schmidt ret = -EFAULT; 2510475f6387SJan Schmidt 2511475f6387SJan Schmidt kfree(di_args); 2512475f6387SJan Schmidt return ret; 2513475f6387SJan Schmidt } 2514475f6387SJan Schmidt 2515416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2516416161dbSMark Fasheh { 2517416161dbSMark Fasheh struct page *page; 2518416161dbSMark Fasheh pgoff_t index; 2519416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2520416161dbSMark Fasheh 2521416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2522416161dbSMark Fasheh 2523416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2524416161dbSMark Fasheh if (!page) 2525416161dbSMark Fasheh return NULL; 2526416161dbSMark Fasheh 2527416161dbSMark Fasheh if (!PageUptodate(page)) { 2528416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2529416161dbSMark Fasheh 0)) 2530416161dbSMark Fasheh return NULL; 2531416161dbSMark Fasheh lock_page(page); 2532416161dbSMark Fasheh if (!PageUptodate(page)) { 2533416161dbSMark Fasheh unlock_page(page); 2534416161dbSMark Fasheh page_cache_release(page); 2535416161dbSMark Fasheh return NULL; 2536416161dbSMark Fasheh } 2537416161dbSMark Fasheh } 2538416161dbSMark Fasheh unlock_page(page); 2539416161dbSMark Fasheh 2540416161dbSMark Fasheh return page; 2541416161dbSMark Fasheh } 2542416161dbSMark Fasheh 254377fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 254477fe20dcSMark Fasheh { 254577fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 254677fe20dcSMark Fasheh another, and lock file content */ 254777fe20dcSMark Fasheh while (1) { 254877fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 254977fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 255077fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 255177fe20dcSMark Fasheh off + len - 1); 255277fe20dcSMark Fasheh if (!ordered && 255377fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 255477fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 255577fe20dcSMark Fasheh break; 255677fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 255777fe20dcSMark Fasheh if (ordered) 255877fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 255977fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 256077fe20dcSMark Fasheh } 256177fe20dcSMark Fasheh } 256277fe20dcSMark Fasheh 2563416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2564416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2565416161dbSMark Fasheh { 2566416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2567416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2568416161dbSMark Fasheh 2569416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2570416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2571416161dbSMark Fasheh } 2572416161dbSMark Fasheh 2573416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2574416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2575416161dbSMark Fasheh { 2576416161dbSMark Fasheh if (inode1 < inode2) { 2577416161dbSMark Fasheh swap(inode1, inode2); 2578416161dbSMark Fasheh swap(loff1, loff2); 2579416161dbSMark Fasheh } 2580416161dbSMark Fasheh 2581416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2582416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2583416161dbSMark Fasheh if (inode1 != inode2) { 2584416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2585416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2586416161dbSMark Fasheh } 2587416161dbSMark Fasheh } 2588416161dbSMark Fasheh 2589416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2590416161dbSMark Fasheh u64 dst_loff, u64 len) 2591416161dbSMark Fasheh { 2592416161dbSMark Fasheh int ret = 0; 2593416161dbSMark Fasheh struct page *src_page, *dst_page; 2594416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2595416161dbSMark Fasheh void *addr, *dst_addr; 2596416161dbSMark Fasheh 2597416161dbSMark Fasheh while (len) { 2598416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2599416161dbSMark Fasheh cmp_len = len; 2600416161dbSMark Fasheh 2601416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2602416161dbSMark Fasheh if (!src_page) 2603416161dbSMark Fasheh return -EINVAL; 2604416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2605416161dbSMark Fasheh if (!dst_page) { 2606416161dbSMark Fasheh page_cache_release(src_page); 2607416161dbSMark Fasheh return -EINVAL; 2608416161dbSMark Fasheh } 2609416161dbSMark Fasheh addr = kmap_atomic(src_page); 2610416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2611416161dbSMark Fasheh 2612416161dbSMark Fasheh flush_dcache_page(src_page); 2613416161dbSMark Fasheh flush_dcache_page(dst_page); 2614416161dbSMark Fasheh 2615416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2616416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2617416161dbSMark Fasheh 2618416161dbSMark Fasheh kunmap_atomic(addr); 2619416161dbSMark Fasheh kunmap_atomic(dst_addr); 2620416161dbSMark Fasheh page_cache_release(src_page); 2621416161dbSMark Fasheh page_cache_release(dst_page); 2622416161dbSMark Fasheh 2623416161dbSMark Fasheh if (ret) 2624416161dbSMark Fasheh break; 2625416161dbSMark Fasheh 2626416161dbSMark Fasheh loff += cmp_len; 2627416161dbSMark Fasheh dst_loff += cmp_len; 2628416161dbSMark Fasheh len -= cmp_len; 2629416161dbSMark Fasheh } 2630416161dbSMark Fasheh 2631416161dbSMark Fasheh return ret; 2632416161dbSMark Fasheh } 2633416161dbSMark Fasheh 2634416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2635416161dbSMark Fasheh { 2636416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2637416161dbSMark Fasheh 2638416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2639416161dbSMark Fasheh return -EINVAL; 2640416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2641416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2642416161dbSMark Fasheh return -EINVAL; 2643416161dbSMark Fasheh 2644416161dbSMark Fasheh return 0; 2645416161dbSMark Fasheh } 2646416161dbSMark Fasheh 2647416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2648416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2649416161dbSMark Fasheh { 2650416161dbSMark Fasheh int ret; 2651416161dbSMark Fasheh 2652416161dbSMark Fasheh /* 2653416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2654416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2655416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2656416161dbSMark Fasheh */ 2657416161dbSMark Fasheh if (src == dst) 2658416161dbSMark Fasheh return -EINVAL; 2659416161dbSMark Fasheh 2660416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2661416161dbSMark Fasheh 2662416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2663416161dbSMark Fasheh if (ret) 2664416161dbSMark Fasheh goto out_unlock; 2665416161dbSMark Fasheh 2666416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2667416161dbSMark Fasheh if (ret) 2668416161dbSMark Fasheh goto out_unlock; 2669416161dbSMark Fasheh 2670416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2671416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2672416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2673416161dbSMark Fasheh ret = -EINVAL; 2674416161dbSMark Fasheh goto out_unlock; 2675416161dbSMark Fasheh } 2676416161dbSMark Fasheh 2677416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2678416161dbSMark Fasheh if (ret == 0) 2679416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2680416161dbSMark Fasheh 2681416161dbSMark Fasheh out_unlock: 2682416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2683416161dbSMark Fasheh 2684416161dbSMark Fasheh return ret; 2685416161dbSMark Fasheh } 2686416161dbSMark Fasheh 2687416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2688416161dbSMark Fasheh 2689416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2690416161dbSMark Fasheh void __user *argp) 2691416161dbSMark Fasheh { 2692cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2693cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2694cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2695416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2696416161dbSMark Fasheh struct file *dst_file = NULL; 2697416161dbSMark Fasheh struct inode *dst; 2698416161dbSMark Fasheh u64 off; 2699416161dbSMark Fasheh u64 len; 2700416161dbSMark Fasheh int i; 2701416161dbSMark Fasheh int ret; 2702cbf8b8caSMark Fasheh unsigned long size; 2703416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2704416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2705416161dbSMark Fasheh 2706416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2707416161dbSMark Fasheh return -EINVAL; 2708416161dbSMark Fasheh 2709416161dbSMark Fasheh ret = mnt_want_write_file(file); 2710416161dbSMark Fasheh if (ret) 2711416161dbSMark Fasheh return ret; 2712416161dbSMark Fasheh 2713cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2714416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2715cbf8b8caSMark Fasheh sizeof(tmp))) { 2716416161dbSMark Fasheh ret = -EFAULT; 2717416161dbSMark Fasheh goto out; 2718416161dbSMark Fasheh } 2719416161dbSMark Fasheh 2720cbf8b8caSMark Fasheh size = sizeof(tmp) + 2721cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2722cbf8b8caSMark Fasheh 2723229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2724cbf8b8caSMark Fasheh 2725229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2726229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2727cbf8b8caSMark Fasheh goto out; 2728cbf8b8caSMark Fasheh } 2729cbf8b8caSMark Fasheh 2730cbf8b8caSMark Fasheh off = same->logical_offset; 2731cbf8b8caSMark Fasheh len = same->length; 2732416161dbSMark Fasheh 2733416161dbSMark Fasheh /* 2734416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2735416161dbSMark Fasheh * This is intended to bound the total time spent in this 2736416161dbSMark Fasheh * ioctl to something sane. 2737416161dbSMark Fasheh */ 2738416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2739416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2740416161dbSMark Fasheh 2741416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2742416161dbSMark Fasheh /* 2743416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2744416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2745416161dbSMark Fasheh * this situation without an update. 2746416161dbSMark Fasheh */ 2747416161dbSMark Fasheh ret = -EINVAL; 2748416161dbSMark Fasheh goto out; 2749416161dbSMark Fasheh } 2750416161dbSMark Fasheh 2751416161dbSMark Fasheh ret = -EISDIR; 2752416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2753416161dbSMark Fasheh goto out; 2754416161dbSMark Fasheh 2755416161dbSMark Fasheh ret = -EACCES; 2756416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2757416161dbSMark Fasheh goto out; 2758416161dbSMark Fasheh 2759cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2760cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2761cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2762cbf8b8caSMark Fasheh same->info[i].status = 0; 2763416161dbSMark Fasheh } 2764416161dbSMark Fasheh 2765cbf8b8caSMark Fasheh ret = 0; 2766cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2767cbf8b8caSMark Fasheh info = &same->info[i]; 2768416161dbSMark Fasheh 2769cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2770416161dbSMark Fasheh if (!dst_file) { 2771cbf8b8caSMark Fasheh info->status = -EBADF; 2772416161dbSMark Fasheh goto next; 2773416161dbSMark Fasheh } 2774416161dbSMark Fasheh 2775416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2776cbf8b8caSMark Fasheh info->status = -EINVAL; 2777416161dbSMark Fasheh goto next; 2778416161dbSMark Fasheh } 2779416161dbSMark Fasheh 2780cbf8b8caSMark Fasheh info->status = -EXDEV; 2781416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2782416161dbSMark Fasheh goto next; 2783416161dbSMark Fasheh 2784416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2785416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2786416161dbSMark Fasheh goto next; 2787416161dbSMark Fasheh 2788416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2789cbf8b8caSMark Fasheh info->status = -EISDIR; 2790416161dbSMark Fasheh goto next; 2791416161dbSMark Fasheh } 2792416161dbSMark Fasheh 2793416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2794cbf8b8caSMark Fasheh info->status = -EACCES; 2795416161dbSMark Fasheh goto next; 2796416161dbSMark Fasheh } 2797416161dbSMark Fasheh 2798cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2799cbf8b8caSMark Fasheh info->logical_offset); 2800cbf8b8caSMark Fasheh if (info->status == 0) 2801cbf8b8caSMark Fasheh info->bytes_deduped += len; 2802416161dbSMark Fasheh 2803416161dbSMark Fasheh next: 2804416161dbSMark Fasheh if (dst_file) 2805416161dbSMark Fasheh fput(dst_file); 2806cbf8b8caSMark Fasheh } 2807416161dbSMark Fasheh 2808cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2809cbf8b8caSMark Fasheh if (ret) 2810416161dbSMark Fasheh ret = -EFAULT; 2811416161dbSMark Fasheh 2812416161dbSMark Fasheh out: 2813416161dbSMark Fasheh mnt_drop_write_file(file); 2814416161dbSMark Fasheh return ret; 2815416161dbSMark Fasheh } 2816416161dbSMark Fasheh 281732b7c687SMark Fasheh /** 281832b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 281932b7c687SMark Fasheh * 282032b7c687SMark Fasheh * @src: Inode to clone from 282132b7c687SMark Fasheh * @inode: Inode to clone to 282232b7c687SMark Fasheh * @off: Offset within source to start clone from 282332b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 282432b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 282532b7c687SMark Fasheh * identical values here 282632b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 282732b7c687SMark Fasheh */ 282832b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 282932b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2830f46b5a66SChristoph Hellwig { 2831f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 283232b7c687SMark Fasheh struct btrfs_path *path = NULL; 2833f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 283432b7c687SMark Fasheh struct btrfs_trans_handle *trans; 283532b7c687SMark Fasheh char *buf = NULL; 2836ae01a0abSYan Zheng struct btrfs_key key; 2837f46b5a66SChristoph Hellwig u32 nritems; 2838f46b5a66SChristoph Hellwig int slot; 2839ae01a0abSYan Zheng int ret; 284032b7c687SMark Fasheh u64 len = olen_aligned; 2841ae01a0abSYan Zheng 2842ae01a0abSYan Zheng ret = -ENOMEM; 2843ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2844ae01a0abSYan Zheng if (!buf) 284532b7c687SMark Fasheh return ret; 2846ae01a0abSYan Zheng 2847ae01a0abSYan Zheng path = btrfs_alloc_path(); 2848ae01a0abSYan Zheng if (!path) { 2849ae01a0abSYan Zheng vfree(buf); 285032b7c687SMark Fasheh return ret; 2851ae01a0abSYan Zheng } 285232b7c687SMark Fasheh 2853ae01a0abSYan Zheng path->reada = 2; 2854c5c9cd4dSSage Weil /* clone data */ 285533345d01SLi Zefan key.objectid = btrfs_ino(src); 2856ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2857ae01a0abSYan Zheng key.offset = 0; 2858f46b5a66SChristoph Hellwig 2859f46b5a66SChristoph Hellwig while (1) { 2860f46b5a66SChristoph Hellwig /* 2861f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2862f46b5a66SChristoph Hellwig * tree. 2863f46b5a66SChristoph Hellwig */ 2864362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2865362a20c5SDavid Sterba 0, 0); 2866f46b5a66SChristoph Hellwig if (ret < 0) 2867f46b5a66SChristoph Hellwig goto out; 2868f46b5a66SChristoph Hellwig 2869ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2870ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2871362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2872f46b5a66SChristoph Hellwig if (ret < 0) 2873f46b5a66SChristoph Hellwig goto out; 2874f46b5a66SChristoph Hellwig if (ret > 0) 2875f46b5a66SChristoph Hellwig break; 2876ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2877f46b5a66SChristoph Hellwig } 2878f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2879f46b5a66SChristoph Hellwig slot = path->slots[0]; 2880f46b5a66SChristoph Hellwig 2881ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2882d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 288333345d01SLi Zefan key.objectid != btrfs_ino(src)) 2884f46b5a66SChristoph Hellwig break; 2885f46b5a66SChristoph Hellwig 2886c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2887c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2888c5c9cd4dSSage Weil int type; 288931840ae1SZheng Yan u32 size; 289031840ae1SZheng Yan struct btrfs_key new_key; 2891c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2892c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2893c5c9cd4dSSage Weil u8 comp; 2894b5384d48SSage Weil u64 endoff; 289531840ae1SZheng Yan 289631840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 289731840ae1SZheng Yan read_extent_buffer(leaf, buf, 289831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 289931840ae1SZheng Yan size); 2900c5c9cd4dSSage Weil 2901c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2902c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2903c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2904c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2905c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2906c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2907d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2908d397712bSChris Mason extent); 2909d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2910d397712bSChris Mason extent); 2911c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2912d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2913d397712bSChris Mason extent); 2914c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2915c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2916c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2917c5c9cd4dSSage Weil extent); 2918c5c9cd4dSSage Weil } 2919b3b4aa74SDavid Sterba btrfs_release_path(path); 292031840ae1SZheng Yan 2921050006a7SSage Weil if (key.offset + datal <= off || 2922aa42ffd9SLiu Bo key.offset >= off + len - 1) 2923c5c9cd4dSSage Weil goto next; 2924c5c9cd4dSSage Weil 292531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 292633345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 29274d728ec7SLi Zefan if (off <= key.offset) 2928c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 29294d728ec7SLi Zefan else 29304d728ec7SLi Zefan new_key.offset = destoff; 2931c5c9cd4dSSage Weil 2932b6f3409bSSage Weil /* 2933b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2934b6f3409bSSage Weil * 1 - add new extent 2935b6f3409bSSage Weil * 1 - inode update 2936b6f3409bSSage Weil */ 2937b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2938a22285a6SYan, Zheng if (IS_ERR(trans)) { 2939a22285a6SYan, Zheng ret = PTR_ERR(trans); 2940a22285a6SYan, Zheng goto out; 2941a22285a6SYan, Zheng } 2942a22285a6SYan, Zheng 2943c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2944c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2945d72c0842SLi Zefan /* 2946d72c0842SLi Zefan * a | --- range to clone ---| b 2947d72c0842SLi Zefan * | ------------- extent ------------- | 2948d72c0842SLi Zefan */ 2949d72c0842SLi Zefan 2950d72c0842SLi Zefan /* substract range b */ 2951d72c0842SLi Zefan if (key.offset + datal > off + len) 2952d72c0842SLi Zefan datal = off + len - key.offset; 2953d72c0842SLi Zefan 2954d72c0842SLi Zefan /* substract range a */ 2955a22285a6SYan, Zheng if (off > key.offset) { 2956a22285a6SYan, Zheng datao += off - key.offset; 2957a22285a6SYan, Zheng datal -= off - key.offset; 2958a22285a6SYan, Zheng } 2959a22285a6SYan, Zheng 29605dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2961a22285a6SYan, Zheng new_key.offset, 2962a22285a6SYan, Zheng new_key.offset + datal, 29632671485dSJosef Bacik 1); 296479787eaaSJeff Mahoney if (ret) { 296579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 296679787eaaSJeff Mahoney ret); 296779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 296879787eaaSJeff Mahoney goto out; 296979787eaaSJeff Mahoney } 2970a22285a6SYan, Zheng 297131840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 297231840ae1SZheng Yan &new_key, size); 297379787eaaSJeff Mahoney if (ret) { 297479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 297579787eaaSJeff Mahoney ret); 297679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 297779787eaaSJeff Mahoney goto out; 297879787eaaSJeff Mahoney } 297931840ae1SZheng Yan 298031840ae1SZheng Yan leaf = path->nodes[0]; 298131840ae1SZheng Yan slot = path->slots[0]; 298231840ae1SZheng Yan write_extent_buffer(leaf, buf, 298331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 298431840ae1SZheng Yan size); 2985ae01a0abSYan Zheng 2986f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2987f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2988c5c9cd4dSSage Weil 2989c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2990c5c9cd4dSSage Weil if (!disko) 2991c5c9cd4dSSage Weil datao = 0; 2992c5c9cd4dSSage Weil 2993c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2994c5c9cd4dSSage Weil datao); 2995c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2996c5c9cd4dSSage Weil datal); 2997c5c9cd4dSSage Weil if (disko) { 2998c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2999ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 30005d4f98a2SYan Zheng disko, diskl, 0, 3001f46b5a66SChristoph Hellwig root->root_key.objectid, 300233345d01SLi Zefan btrfs_ino(inode), 300366d7e7f0SArne Jansen new_key.offset - datao, 300466d7e7f0SArne Jansen 0); 300579787eaaSJeff Mahoney if (ret) { 300679787eaaSJeff Mahoney btrfs_abort_transaction(trans, 300779787eaaSJeff Mahoney root, 300879787eaaSJeff Mahoney ret); 300979787eaaSJeff Mahoney btrfs_end_transaction(trans, 301079787eaaSJeff Mahoney root); 301179787eaaSJeff Mahoney goto out; 301279787eaaSJeff Mahoney 301379787eaaSJeff Mahoney } 3014f46b5a66SChristoph Hellwig } 3015c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3016c5c9cd4dSSage Weil u64 skip = 0; 3017c5c9cd4dSSage Weil u64 trim = 0; 3018c5c9cd4dSSage Weil if (off > key.offset) { 3019c5c9cd4dSSage Weil skip = off - key.offset; 3020c5c9cd4dSSage Weil new_key.offset += skip; 302131840ae1SZheng Yan } 3022d397712bSChris Mason 3023c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3024c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3025d397712bSChris Mason 3026c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3027c5c9cd4dSSage Weil ret = -EINVAL; 3028a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3029c5c9cd4dSSage Weil goto out; 303031840ae1SZheng Yan } 3031c5c9cd4dSSage Weil size -= skip + trim; 3032c5c9cd4dSSage Weil datal -= skip + trim; 3033a22285a6SYan, Zheng 30345dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3035a22285a6SYan, Zheng new_key.offset, 3036a22285a6SYan, Zheng new_key.offset + datal, 30372671485dSJosef Bacik 1); 303879787eaaSJeff Mahoney if (ret) { 303979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304079787eaaSJeff Mahoney ret); 304179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304279787eaaSJeff Mahoney goto out; 304379787eaaSJeff Mahoney } 3044a22285a6SYan, Zheng 3045c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3046c5c9cd4dSSage Weil &new_key, size); 304779787eaaSJeff Mahoney if (ret) { 304879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304979787eaaSJeff Mahoney ret); 305079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 305179787eaaSJeff Mahoney goto out; 305279787eaaSJeff Mahoney } 3053c5c9cd4dSSage Weil 3054c5c9cd4dSSage Weil if (skip) { 3055d397712bSChris Mason u32 start = 3056d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3057c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3058c5c9cd4dSSage Weil datal); 3059c5c9cd4dSSage Weil } 3060c5c9cd4dSSage Weil 3061c5c9cd4dSSage Weil leaf = path->nodes[0]; 3062c5c9cd4dSSage Weil slot = path->slots[0]; 3063c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3064c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3065c5c9cd4dSSage Weil size); 3066c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3067c5c9cd4dSSage Weil } 3068c5c9cd4dSSage Weil 3069c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3070b3b4aa74SDavid Sterba btrfs_release_path(path); 3071c5c9cd4dSSage Weil 30720c4d2d95SJosef Bacik inode_inc_iversion(inode); 3073a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3074b5384d48SSage Weil 3075b5384d48SSage Weil /* 3076b5384d48SSage Weil * we round up to the block size at eof when 3077b5384d48SSage Weil * determining which extents to clone above, 3078b5384d48SSage Weil * but shouldn't round up the file size 3079b5384d48SSage Weil */ 3080b5384d48SSage Weil endoff = new_key.offset + datal; 30815f3888ffSLi Zefan if (endoff > destoff+olen) 30825f3888ffSLi Zefan endoff = destoff+olen; 3083b5384d48SSage Weil if (endoff > inode->i_size) 3084b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3085b5384d48SSage Weil 3086a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 308779787eaaSJeff Mahoney if (ret) { 308879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3089a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 309079787eaaSJeff Mahoney goto out; 309179787eaaSJeff Mahoney } 309279787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3093a22285a6SYan, Zheng } 3094c5c9cd4dSSage Weil next: 3095b3b4aa74SDavid Sterba btrfs_release_path(path); 3096ae01a0abSYan Zheng key.offset++; 3097ae01a0abSYan Zheng } 3098f46b5a66SChristoph Hellwig ret = 0; 309932b7c687SMark Fasheh 3100f46b5a66SChristoph Hellwig out: 3101b3b4aa74SDavid Sterba btrfs_release_path(path); 310232b7c687SMark Fasheh btrfs_free_path(path); 310332b7c687SMark Fasheh vfree(buf); 310432b7c687SMark Fasheh return ret; 310532b7c687SMark Fasheh } 310632b7c687SMark Fasheh 310732b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 310832b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 310932b7c687SMark Fasheh { 311054563d41SAl Viro struct inode *inode = file_inode(file); 311132b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 311232b7c687SMark Fasheh struct fd src_file; 311332b7c687SMark Fasheh struct inode *src; 311432b7c687SMark Fasheh int ret; 311532b7c687SMark Fasheh u64 len = olen; 311632b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 311732b7c687SMark Fasheh int same_inode = 0; 311832b7c687SMark Fasheh 311932b7c687SMark Fasheh /* 312032b7c687SMark Fasheh * TODO: 312132b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 312232b7c687SMark Fasheh * decompress into destination's address_space (the file offset 312332b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 312432b7c687SMark Fasheh * otherwise reinsert) a subrange. 312532b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 312632b7c687SMark Fasheh * they don't overlap)? 312732b7c687SMark Fasheh */ 312832b7c687SMark Fasheh 312932b7c687SMark Fasheh /* the destination must be opened for writing */ 313032b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 313132b7c687SMark Fasheh return -EINVAL; 313232b7c687SMark Fasheh 313332b7c687SMark Fasheh if (btrfs_root_readonly(root)) 313432b7c687SMark Fasheh return -EROFS; 313532b7c687SMark Fasheh 313632b7c687SMark Fasheh ret = mnt_want_write_file(file); 313732b7c687SMark Fasheh if (ret) 313832b7c687SMark Fasheh return ret; 313932b7c687SMark Fasheh 314032b7c687SMark Fasheh src_file = fdget(srcfd); 314132b7c687SMark Fasheh if (!src_file.file) { 314232b7c687SMark Fasheh ret = -EBADF; 314332b7c687SMark Fasheh goto out_drop_write; 314432b7c687SMark Fasheh } 314532b7c687SMark Fasheh 314632b7c687SMark Fasheh ret = -EXDEV; 314732b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 314832b7c687SMark Fasheh goto out_fput; 314932b7c687SMark Fasheh 315032b7c687SMark Fasheh src = file_inode(src_file.file); 315132b7c687SMark Fasheh 315232b7c687SMark Fasheh ret = -EINVAL; 315332b7c687SMark Fasheh if (src == inode) 315432b7c687SMark Fasheh same_inode = 1; 315532b7c687SMark Fasheh 315632b7c687SMark Fasheh /* the src must be open for reading */ 315732b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 315832b7c687SMark Fasheh goto out_fput; 315932b7c687SMark Fasheh 316032b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 316132b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 316232b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 316332b7c687SMark Fasheh goto out_fput; 316432b7c687SMark Fasheh 316532b7c687SMark Fasheh ret = -EISDIR; 316632b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 316732b7c687SMark Fasheh goto out_fput; 316832b7c687SMark Fasheh 316932b7c687SMark Fasheh ret = -EXDEV; 317032b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 317132b7c687SMark Fasheh goto out_fput; 317232b7c687SMark Fasheh 317332b7c687SMark Fasheh if (!same_inode) { 317432b7c687SMark Fasheh if (inode < src) { 317532b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 317632b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 317732b7c687SMark Fasheh } else { 317832b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 317932b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 318032b7c687SMark Fasheh } 318132b7c687SMark Fasheh } else { 318232b7c687SMark Fasheh mutex_lock(&src->i_mutex); 318332b7c687SMark Fasheh } 318432b7c687SMark Fasheh 318532b7c687SMark Fasheh /* determine range to clone */ 318632b7c687SMark Fasheh ret = -EINVAL; 318732b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 318832b7c687SMark Fasheh goto out_unlock; 318932b7c687SMark Fasheh if (len == 0) 319032b7c687SMark Fasheh olen = len = src->i_size - off; 319132b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 319232b7c687SMark Fasheh if (off + len == src->i_size) 319332b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 319432b7c687SMark Fasheh 319532b7c687SMark Fasheh /* verify the end result is block aligned */ 319632b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 319732b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 319832b7c687SMark Fasheh goto out_unlock; 319932b7c687SMark Fasheh 320032b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 320132b7c687SMark Fasheh if (same_inode) { 320232b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 320332b7c687SMark Fasheh goto out_unlock; 320432b7c687SMark Fasheh } 320532b7c687SMark Fasheh 320632b7c687SMark Fasheh if (destoff > inode->i_size) { 320732b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 320832b7c687SMark Fasheh if (ret) 320932b7c687SMark Fasheh goto out_unlock; 321032b7c687SMark Fasheh } 321132b7c687SMark Fasheh 321232b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 321332b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 321432b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 321532b7c687SMark Fasheh 321632b7c687SMark Fasheh lock_extent_range(src, off, len); 321732b7c687SMark Fasheh 321832b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 321932b7c687SMark Fasheh 3220aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3221f46b5a66SChristoph Hellwig out_unlock: 3222f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3223a96fbc72SLiu Bo if (!same_inode) 3224f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3225f46b5a66SChristoph Hellwig out_fput: 32262903ff01SAl Viro fdput(src_file); 3227ab67b7c1SYan Zheng out_drop_write: 32282a79f17eSAl Viro mnt_drop_write_file(file); 3229f46b5a66SChristoph Hellwig return ret; 3230f46b5a66SChristoph Hellwig } 3231f46b5a66SChristoph Hellwig 32327a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3233c5c9cd4dSSage Weil { 3234c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3235c5c9cd4dSSage Weil 32367a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3237c5c9cd4dSSage Weil return -EFAULT; 3238c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3239c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3240c5c9cd4dSSage Weil } 3241c5c9cd4dSSage Weil 3242f46b5a66SChristoph Hellwig /* 3243f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3244f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3245f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3246f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3247f46b5a66SChristoph Hellwig */ 3248b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3249f46b5a66SChristoph Hellwig { 3250496ad9aaSAl Viro struct inode *inode = file_inode(file); 3251f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3252f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 32531ab86aedSSage Weil int ret; 3254f46b5a66SChristoph Hellwig 32551ab86aedSSage Weil ret = -EPERM; 3256df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3257f46b5a66SChristoph Hellwig goto out; 32581ab86aedSSage Weil 32591ab86aedSSage Weil ret = -EINPROGRESS; 32601ab86aedSSage Weil if (file->private_data) 32611ab86aedSSage Weil goto out; 32629ca9ee09SSage Weil 3263b83cc969SLi Zefan ret = -EROFS; 3264b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3265b83cc969SLi Zefan goto out; 3266b83cc969SLi Zefan 3267a561be71SAl Viro ret = mnt_want_write_file(file); 3268c146afadSYan Zheng if (ret) 3269c146afadSYan Zheng goto out; 3270c146afadSYan Zheng 3271a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 32729ca9ee09SSage Weil 3273f46b5a66SChristoph Hellwig ret = -ENOMEM; 32747a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3275abd30bb0STsutomu Itoh if (IS_ERR(trans)) 32761ab86aedSSage Weil goto out_drop; 32771ab86aedSSage Weil 32781ab86aedSSage Weil file->private_data = trans; 32791ab86aedSSage Weil return 0; 32801ab86aedSSage Weil 32811ab86aedSSage Weil out_drop: 3282a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 32832a79f17eSAl Viro mnt_drop_write_file(file); 3284f46b5a66SChristoph Hellwig out: 3285f46b5a66SChristoph Hellwig return ret; 3286f46b5a66SChristoph Hellwig } 3287f46b5a66SChristoph Hellwig 32886ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32896ef5ed0dSJosef Bacik { 3290496ad9aaSAl Viro struct inode *inode = file_inode(file); 32916ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32926ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32936ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32946ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32956ef5ed0dSJosef Bacik struct btrfs_path *path; 32966ef5ed0dSJosef Bacik struct btrfs_key location; 32976ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 32986ef5ed0dSJosef Bacik u64 objectid = 0; 32996ef5ed0dSJosef Bacik u64 dir_id; 33003c04ce01SMiao Xie int ret; 33016ef5ed0dSJosef Bacik 33026ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33036ef5ed0dSJosef Bacik return -EPERM; 33046ef5ed0dSJosef Bacik 33053c04ce01SMiao Xie ret = mnt_want_write_file(file); 33063c04ce01SMiao Xie if (ret) 33073c04ce01SMiao Xie return ret; 33083c04ce01SMiao Xie 33093c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33103c04ce01SMiao Xie ret = -EFAULT; 33113c04ce01SMiao Xie goto out; 33123c04ce01SMiao Xie } 33136ef5ed0dSJosef Bacik 33146ef5ed0dSJosef Bacik if (!objectid) 33151cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33166ef5ed0dSJosef Bacik 33176ef5ed0dSJosef Bacik location.objectid = objectid; 33186ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33196ef5ed0dSJosef Bacik location.offset = (u64)-1; 33206ef5ed0dSJosef Bacik 33216ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 33223c04ce01SMiao Xie if (IS_ERR(new_root)) { 33233c04ce01SMiao Xie ret = PTR_ERR(new_root); 33243c04ce01SMiao Xie goto out; 33253c04ce01SMiao Xie } 33266ef5ed0dSJosef Bacik 33276ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33283c04ce01SMiao Xie if (!path) { 33293c04ce01SMiao Xie ret = -ENOMEM; 33303c04ce01SMiao Xie goto out; 33313c04ce01SMiao Xie } 33326ef5ed0dSJosef Bacik path->leave_spinning = 1; 33336ef5ed0dSJosef Bacik 33346ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 333598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33366ef5ed0dSJosef Bacik btrfs_free_path(path); 33373c04ce01SMiao Xie ret = PTR_ERR(trans); 33383c04ce01SMiao Xie goto out; 33396ef5ed0dSJosef Bacik } 33406ef5ed0dSJosef Bacik 33416c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 33426ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 33436ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3344cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33456ef5ed0dSJosef Bacik btrfs_free_path(path); 33466ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33476ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 33486ef5ed0dSJosef Bacik "this isn't going to work\n"); 33493c04ce01SMiao Xie ret = -ENOENT; 33503c04ce01SMiao Xie goto out; 33516ef5ed0dSJosef Bacik } 33526ef5ed0dSJosef Bacik 33536ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33546ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33556ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33566ef5ed0dSJosef Bacik btrfs_free_path(path); 33576ef5ed0dSJosef Bacik 33582b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 33596ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 33603c04ce01SMiao Xie out: 33613c04ce01SMiao Xie mnt_drop_write_file(file); 33623c04ce01SMiao Xie return ret; 33636ef5ed0dSJosef Bacik } 33646ef5ed0dSJosef Bacik 33655af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3366bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3367bf5fc093SJosef Bacik { 3368bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3369bf5fc093SJosef Bacik 3370bf5fc093SJosef Bacik space->total_bytes = 0; 3371bf5fc093SJosef Bacik space->used_bytes = 0; 3372bf5fc093SJosef Bacik space->flags = 0; 3373bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3374bf5fc093SJosef Bacik space->flags = block_group->flags; 3375bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3376bf5fc093SJosef Bacik space->used_bytes += 3377bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3378bf5fc093SJosef Bacik } 3379bf5fc093SJosef Bacik } 3380bf5fc093SJosef Bacik 338148a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 33821406e432SJosef Bacik { 33831406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33841406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33851406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33867fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 338713f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33881406e432SJosef Bacik struct btrfs_space_info *info; 3389bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3390bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3391bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3392bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3393bf5fc093SJosef Bacik int num_types = 4; 33947fde62bfSChris Mason int alloc_size; 33951406e432SJosef Bacik int ret = 0; 339651788b1bSDan Rosenberg u64 slot_count = 0; 3397bf5fc093SJosef Bacik int i, c; 33981406e432SJosef Bacik 33991406e432SJosef Bacik if (copy_from_user(&space_args, 34001406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34011406e432SJosef Bacik sizeof(space_args))) 34021406e432SJosef Bacik return -EFAULT; 34031406e432SJosef Bacik 3404bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3405bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3406bf5fc093SJosef Bacik 3407bf5fc093SJosef Bacik info = NULL; 34087fde62bfSChris Mason rcu_read_lock(); 3409bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3410bf5fc093SJosef Bacik list) { 3411bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3412bf5fc093SJosef Bacik info = tmp; 3413bf5fc093SJosef Bacik break; 3414bf5fc093SJosef Bacik } 3415bf5fc093SJosef Bacik } 34167fde62bfSChris Mason rcu_read_unlock(); 34171406e432SJosef Bacik 3418bf5fc093SJosef Bacik if (!info) 3419bf5fc093SJosef Bacik continue; 3420bf5fc093SJosef Bacik 3421bf5fc093SJosef Bacik down_read(&info->groups_sem); 3422bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3423bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3424bf5fc093SJosef Bacik slot_count++; 3425bf5fc093SJosef Bacik } 3426bf5fc093SJosef Bacik up_read(&info->groups_sem); 3427bf5fc093SJosef Bacik } 3428bf5fc093SJosef Bacik 34297fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34307fde62bfSChris Mason if (space_args.space_slots == 0) { 34317fde62bfSChris Mason space_args.total_spaces = slot_count; 34327fde62bfSChris Mason goto out; 34337fde62bfSChris Mason } 3434bf5fc093SJosef Bacik 343551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3436bf5fc093SJosef Bacik 34377fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3438bf5fc093SJosef Bacik 34397fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34407fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34417fde62bfSChris Mason */ 34427fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 34437fde62bfSChris Mason return -ENOMEM; 34447fde62bfSChris Mason 34457fde62bfSChris Mason space_args.total_spaces = 0; 34467fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 34477fde62bfSChris Mason if (!dest) 34487fde62bfSChris Mason return -ENOMEM; 34497fde62bfSChris Mason dest_orig = dest; 34507fde62bfSChris Mason 34517fde62bfSChris Mason /* now we have a buffer to copy into */ 3452bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3453bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3454bf5fc093SJosef Bacik 345551788b1bSDan Rosenberg if (!slot_count) 345651788b1bSDan Rosenberg break; 345751788b1bSDan Rosenberg 3458bf5fc093SJosef Bacik info = NULL; 34591406e432SJosef Bacik rcu_read_lock(); 3460bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3461bf5fc093SJosef Bacik list) { 3462bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3463bf5fc093SJosef Bacik info = tmp; 34647fde62bfSChris Mason break; 3465bf5fc093SJosef Bacik } 3466bf5fc093SJosef Bacik } 3467bf5fc093SJosef Bacik rcu_read_unlock(); 34687fde62bfSChris Mason 3469bf5fc093SJosef Bacik if (!info) 3470bf5fc093SJosef Bacik continue; 3471bf5fc093SJosef Bacik down_read(&info->groups_sem); 3472bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3473bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 34745af3e8ccSStefan Behrens btrfs_get_block_group_info( 34755af3e8ccSStefan Behrens &info->block_groups[c], &space); 34767fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34771406e432SJosef Bacik dest++; 34781406e432SJosef Bacik space_args.total_spaces++; 347951788b1bSDan Rosenberg slot_count--; 34801406e432SJosef Bacik } 348151788b1bSDan Rosenberg if (!slot_count) 348251788b1bSDan Rosenberg break; 3483bf5fc093SJosef Bacik } 3484bf5fc093SJosef Bacik up_read(&info->groups_sem); 3485bf5fc093SJosef Bacik } 34861406e432SJosef Bacik 34872eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 34887fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 34897fde62bfSChris Mason 34907fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 34917fde62bfSChris Mason ret = -EFAULT; 34927fde62bfSChris Mason 34937fde62bfSChris Mason kfree(dest_orig); 34947fde62bfSChris Mason out: 34957fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 34961406e432SJosef Bacik ret = -EFAULT; 34971406e432SJosef Bacik 34981406e432SJosef Bacik return ret; 34991406e432SJosef Bacik } 35001406e432SJosef Bacik 3501f46b5a66SChristoph Hellwig /* 3502f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3503f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3504f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3505f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3506f46b5a66SChristoph Hellwig */ 3507f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3508f46b5a66SChristoph Hellwig { 3509496ad9aaSAl Viro struct inode *inode = file_inode(file); 3510f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3511f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3512f46b5a66SChristoph Hellwig 3513f46b5a66SChristoph Hellwig trans = file->private_data; 35141ab86aedSSage Weil if (!trans) 35151ab86aedSSage Weil return -EINVAL; 3516b214107eSChristoph Hellwig file->private_data = NULL; 35179ca9ee09SSage Weil 35181ab86aedSSage Weil btrfs_end_transaction(trans, root); 35191ab86aedSSage Weil 3520a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 35219ca9ee09SSage Weil 35222a79f17eSAl Viro mnt_drop_write_file(file); 35231ab86aedSSage Weil return 0; 3524f46b5a66SChristoph Hellwig } 3525f46b5a66SChristoph Hellwig 35269a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35279a8c28beSMiao Xie void __user *argp) 352846204592SSage Weil { 352946204592SSage Weil struct btrfs_trans_handle *trans; 353046204592SSage Weil u64 transid; 3531db5b493aSTsutomu Itoh int ret; 353246204592SSage Weil 3533d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3534ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3535ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 353698d5dc13STsutomu Itoh return PTR_ERR(trans); 3537ff7c1d33SMiao Xie 3538ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3539ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3540ff7c1d33SMiao Xie goto out; 3541ff7c1d33SMiao Xie } 354246204592SSage Weil transid = trans->transid; 3543db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 35448b2b2d3cSTsutomu Itoh if (ret) { 35458b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3546db5b493aSTsutomu Itoh return ret; 35478b2b2d3cSTsutomu Itoh } 3548ff7c1d33SMiao Xie out: 354946204592SSage Weil if (argp) 355046204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 355146204592SSage Weil return -EFAULT; 355246204592SSage Weil return 0; 355346204592SSage Weil } 355446204592SSage Weil 35559a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 35569a8c28beSMiao Xie void __user *argp) 355746204592SSage Weil { 355846204592SSage Weil u64 transid; 355946204592SSage Weil 356046204592SSage Weil if (argp) { 356146204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 356246204592SSage Weil return -EFAULT; 356346204592SSage Weil } else { 356446204592SSage Weil transid = 0; /* current trans */ 356546204592SSage Weil } 356646204592SSage Weil return btrfs_wait_for_commit(root, transid); 356746204592SSage Weil } 356846204592SSage Weil 3569b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3570475f6387SJan Schmidt { 3571496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3572475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3573b8e95489SMiao Xie int ret; 3574475f6387SJan Schmidt 3575475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3576475f6387SJan Schmidt return -EPERM; 3577475f6387SJan Schmidt 3578475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3579475f6387SJan Schmidt if (IS_ERR(sa)) 3580475f6387SJan Schmidt return PTR_ERR(sa); 3581475f6387SJan Schmidt 3582b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3583b8e95489SMiao Xie ret = mnt_want_write_file(file); 3584b8e95489SMiao Xie if (ret) 3585b8e95489SMiao Xie goto out; 3586b8e95489SMiao Xie } 3587b8e95489SMiao Xie 3588aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 358963a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 359063a212abSStefan Behrens 0); 3591475f6387SJan Schmidt 3592475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3593475f6387SJan Schmidt ret = -EFAULT; 3594475f6387SJan Schmidt 3595b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3596b8e95489SMiao Xie mnt_drop_write_file(file); 3597b8e95489SMiao Xie out: 3598475f6387SJan Schmidt kfree(sa); 3599475f6387SJan Schmidt return ret; 3600475f6387SJan Schmidt } 3601475f6387SJan Schmidt 3602475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3603475f6387SJan Schmidt { 3604475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3605475f6387SJan Schmidt return -EPERM; 3606475f6387SJan Schmidt 3607aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3608475f6387SJan Schmidt } 3609475f6387SJan Schmidt 3610475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3611475f6387SJan Schmidt void __user *arg) 3612475f6387SJan Schmidt { 3613475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3614475f6387SJan Schmidt int ret; 3615475f6387SJan Schmidt 3616475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3617475f6387SJan Schmidt return -EPERM; 3618475f6387SJan Schmidt 3619475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3620475f6387SJan Schmidt if (IS_ERR(sa)) 3621475f6387SJan Schmidt return PTR_ERR(sa); 3622475f6387SJan Schmidt 3623475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3624475f6387SJan Schmidt 3625475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3626475f6387SJan Schmidt ret = -EFAULT; 3627475f6387SJan Schmidt 3628475f6387SJan Schmidt kfree(sa); 3629475f6387SJan Schmidt return ret; 3630475f6387SJan Schmidt } 3631475f6387SJan Schmidt 3632c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3633b27f7c0cSDavid Sterba void __user *arg) 3634c11d2c23SStefan Behrens { 3635c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3636c11d2c23SStefan Behrens int ret; 3637c11d2c23SStefan Behrens 3638c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3639c11d2c23SStefan Behrens if (IS_ERR(sa)) 3640c11d2c23SStefan Behrens return PTR_ERR(sa); 3641c11d2c23SStefan Behrens 3642b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3643b27f7c0cSDavid Sterba kfree(sa); 3644b27f7c0cSDavid Sterba return -EPERM; 3645b27f7c0cSDavid Sterba } 3646b27f7c0cSDavid Sterba 3647b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3648c11d2c23SStefan Behrens 3649c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3650c11d2c23SStefan Behrens ret = -EFAULT; 3651c11d2c23SStefan Behrens 3652c11d2c23SStefan Behrens kfree(sa); 3653c11d2c23SStefan Behrens return ret; 3654c11d2c23SStefan Behrens } 3655c11d2c23SStefan Behrens 36563f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 36573f6bcfbdSStefan Behrens { 36583f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36593f6bcfbdSStefan Behrens int ret; 36603f6bcfbdSStefan Behrens 36613f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36623f6bcfbdSStefan Behrens return -EPERM; 36633f6bcfbdSStefan Behrens 36643f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36653f6bcfbdSStefan Behrens if (IS_ERR(p)) 36663f6bcfbdSStefan Behrens return PTR_ERR(p); 36673f6bcfbdSStefan Behrens 36683f6bcfbdSStefan Behrens switch (p->cmd) { 36693f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3670adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3671adfa97cbSIlya Dryomov ret = -EROFS; 3672adfa97cbSIlya Dryomov goto out; 3673adfa97cbSIlya Dryomov } 36743f6bcfbdSStefan Behrens if (atomic_xchg( 36753f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36763f6bcfbdSStefan Behrens 1)) { 3677e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 36783f6bcfbdSStefan Behrens } else { 36793f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 36803f6bcfbdSStefan Behrens atomic_set( 36813f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 36823f6bcfbdSStefan Behrens 0); 36833f6bcfbdSStefan Behrens } 36843f6bcfbdSStefan Behrens break; 36853f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36863f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 36873f6bcfbdSStefan Behrens ret = 0; 36883f6bcfbdSStefan Behrens break; 36893f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 36903f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 36913f6bcfbdSStefan Behrens break; 36923f6bcfbdSStefan Behrens default: 36933f6bcfbdSStefan Behrens ret = -EINVAL; 36943f6bcfbdSStefan Behrens break; 36953f6bcfbdSStefan Behrens } 36963f6bcfbdSStefan Behrens 36973f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 36983f6bcfbdSStefan Behrens ret = -EFAULT; 3699adfa97cbSIlya Dryomov out: 37003f6bcfbdSStefan Behrens kfree(p); 37013f6bcfbdSStefan Behrens return ret; 37023f6bcfbdSStefan Behrens } 37033f6bcfbdSStefan Behrens 3704d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3705d7728c96SJan Schmidt { 3706d7728c96SJan Schmidt int ret = 0; 3707d7728c96SJan Schmidt int i; 3708740c3d22SChris Mason u64 rel_ptr; 3709d7728c96SJan Schmidt int size; 3710806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3711d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3712d7728c96SJan Schmidt struct btrfs_path *path; 3713d7728c96SJan Schmidt 371482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3715d7728c96SJan Schmidt return -EPERM; 3716d7728c96SJan Schmidt 3717d7728c96SJan Schmidt path = btrfs_alloc_path(); 3718d7728c96SJan Schmidt if (!path) { 3719d7728c96SJan Schmidt ret = -ENOMEM; 3720d7728c96SJan Schmidt goto out; 3721d7728c96SJan Schmidt } 3722d7728c96SJan Schmidt 3723d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3724d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3725d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3726d7728c96SJan Schmidt ipa = NULL; 3727d7728c96SJan Schmidt goto out; 3728d7728c96SJan Schmidt } 3729d7728c96SJan Schmidt 3730d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3731d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3732d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3733d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3734d7728c96SJan Schmidt ipath = NULL; 3735d7728c96SJan Schmidt goto out; 3736d7728c96SJan Schmidt } 3737d7728c96SJan Schmidt 3738d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3739d7728c96SJan Schmidt if (ret < 0) 3740d7728c96SJan Schmidt goto out; 3741d7728c96SJan Schmidt 3742d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3743745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3744745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3745740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3746d7728c96SJan Schmidt } 3747d7728c96SJan Schmidt 3748745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3749745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3750d7728c96SJan Schmidt if (ret) { 3751d7728c96SJan Schmidt ret = -EFAULT; 3752d7728c96SJan Schmidt goto out; 3753d7728c96SJan Schmidt } 3754d7728c96SJan Schmidt 3755d7728c96SJan Schmidt out: 3756d7728c96SJan Schmidt btrfs_free_path(path); 3757d7728c96SJan Schmidt free_ipath(ipath); 3758d7728c96SJan Schmidt kfree(ipa); 3759d7728c96SJan Schmidt 3760d7728c96SJan Schmidt return ret; 3761d7728c96SJan Schmidt } 3762d7728c96SJan Schmidt 3763d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3764d7728c96SJan Schmidt { 3765d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3766d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3767d7728c96SJan Schmidt 3768d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3769d7728c96SJan Schmidt inodes->bytes_left -= c; 3770d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3771d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3772d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3773d7728c96SJan Schmidt inodes->elem_cnt += 3; 3774d7728c96SJan Schmidt } else { 3775d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3776d7728c96SJan Schmidt inodes->bytes_left = 0; 3777d7728c96SJan Schmidt inodes->elem_missed += 3; 3778d7728c96SJan Schmidt } 3779d7728c96SJan Schmidt 3780d7728c96SJan Schmidt return 0; 3781d7728c96SJan Schmidt } 3782d7728c96SJan Schmidt 3783d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3784d7728c96SJan Schmidt void __user *arg) 3785d7728c96SJan Schmidt { 3786d7728c96SJan Schmidt int ret = 0; 3787d7728c96SJan Schmidt int size; 3788d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3789d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3790d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3791d7728c96SJan Schmidt 3792d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3793d7728c96SJan Schmidt return -EPERM; 3794d7728c96SJan Schmidt 3795d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3796d7728c96SJan Schmidt if (IS_ERR(loi)) { 3797d7728c96SJan Schmidt ret = PTR_ERR(loi); 3798d7728c96SJan Schmidt loi = NULL; 3799d7728c96SJan Schmidt goto out; 3800d7728c96SJan Schmidt } 3801d7728c96SJan Schmidt 3802d7728c96SJan Schmidt path = btrfs_alloc_path(); 3803d7728c96SJan Schmidt if (!path) { 3804d7728c96SJan Schmidt ret = -ENOMEM; 3805d7728c96SJan Schmidt goto out; 3806d7728c96SJan Schmidt } 3807d7728c96SJan Schmidt 3808425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3809d7728c96SJan Schmidt inodes = init_data_container(size); 3810d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3811d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3812d7728c96SJan Schmidt inodes = NULL; 3813d7728c96SJan Schmidt goto out; 3814d7728c96SJan Schmidt } 3815d7728c96SJan Schmidt 3816df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3817df031f07SLiu Bo build_ino_list, inodes); 3818df031f07SLiu Bo if (ret == -EINVAL) 3819d7728c96SJan Schmidt ret = -ENOENT; 3820d7728c96SJan Schmidt if (ret < 0) 3821d7728c96SJan Schmidt goto out; 3822d7728c96SJan Schmidt 3823745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3824745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3825d7728c96SJan Schmidt if (ret) 3826d7728c96SJan Schmidt ret = -EFAULT; 3827d7728c96SJan Schmidt 3828d7728c96SJan Schmidt out: 3829d7728c96SJan Schmidt btrfs_free_path(path); 3830425d17a2SLiu Bo vfree(inodes); 3831d7728c96SJan Schmidt kfree(loi); 3832d7728c96SJan Schmidt 3833d7728c96SJan Schmidt return ret; 3834d7728c96SJan Schmidt } 3835d7728c96SJan Schmidt 383619a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3837c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3838c9e9f97bSIlya Dryomov { 3839c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3840c9e9f97bSIlya Dryomov 3841c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3842c9e9f97bSIlya Dryomov 3843837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3844837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3845837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3846837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3847a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3848a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3849837d5b6eSIlya Dryomov 3850c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3851c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3852c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 385319a39dceSIlya Dryomov 385419a39dceSIlya Dryomov if (lock) { 385519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 385619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 385719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 385819a39dceSIlya Dryomov } else { 385919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 386019a39dceSIlya Dryomov } 3861c9e9f97bSIlya Dryomov } 3862c9e9f97bSIlya Dryomov 38639ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3864c9e9f97bSIlya Dryomov { 3865496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3866c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3867c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3868c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3869ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3870c9e9f97bSIlya Dryomov int ret; 3871c9e9f97bSIlya Dryomov 3872c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3873c9e9f97bSIlya Dryomov return -EPERM; 3874c9e9f97bSIlya Dryomov 3875e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38769ba1f6e4SLiu Bo if (ret) 38779ba1f6e4SLiu Bo return ret; 38789ba1f6e4SLiu Bo 3879ed0fb78fSIlya Dryomov again: 3880ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3881c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3882c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3883ed0fb78fSIlya Dryomov need_unlock = true; 3884ed0fb78fSIlya Dryomov goto locked; 3885ed0fb78fSIlya Dryomov } 3886ed0fb78fSIlya Dryomov 3887ed0fb78fSIlya Dryomov /* 3888ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3889ed0fb78fSIlya Dryomov * (1) some other op is running 3890ed0fb78fSIlya Dryomov * (2) balance is running 3891ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3892ed0fb78fSIlya Dryomov */ 3893ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3894ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3895ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3896ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3897ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3898ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3899ed0fb78fSIlya Dryomov goto again; 3900ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3901ed0fb78fSIlya Dryomov 3902ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3903ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3904ed0fb78fSIlya Dryomov /* this is (3) */ 3905ed0fb78fSIlya Dryomov need_unlock = false; 3906ed0fb78fSIlya Dryomov goto locked; 3907ed0fb78fSIlya Dryomov } 3908ed0fb78fSIlya Dryomov 3909ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3910ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3911ed0fb78fSIlya Dryomov goto again; 3912ed0fb78fSIlya Dryomov } else { 3913ed0fb78fSIlya Dryomov /* this is (2) */ 3914ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3915ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3916ed0fb78fSIlya Dryomov goto out; 3917ed0fb78fSIlya Dryomov } 3918ed0fb78fSIlya Dryomov } else { 3919ed0fb78fSIlya Dryomov /* this is (1) */ 3920ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3921e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3922ed0fb78fSIlya Dryomov goto out; 3923ed0fb78fSIlya Dryomov } 3924ed0fb78fSIlya Dryomov 3925ed0fb78fSIlya Dryomov locked: 3926ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3927c9e9f97bSIlya Dryomov 3928c9e9f97bSIlya Dryomov if (arg) { 3929c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3930c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3931c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3932ed0fb78fSIlya Dryomov goto out_unlock; 3933c9e9f97bSIlya Dryomov } 3934de322263SIlya Dryomov 3935de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3936de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3937de322263SIlya Dryomov ret = -ENOTCONN; 3938de322263SIlya Dryomov goto out_bargs; 3939de322263SIlya Dryomov } 3940de322263SIlya Dryomov 3941de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3942de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3943de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3944de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3945de322263SIlya Dryomov 3946de322263SIlya Dryomov goto do_balance; 3947de322263SIlya Dryomov } 3948c9e9f97bSIlya Dryomov } else { 3949c9e9f97bSIlya Dryomov bargs = NULL; 3950c9e9f97bSIlya Dryomov } 3951c9e9f97bSIlya Dryomov 3952ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3953837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3954837d5b6eSIlya Dryomov goto out_bargs; 3955837d5b6eSIlya Dryomov } 3956837d5b6eSIlya Dryomov 3957c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3958c9e9f97bSIlya Dryomov if (!bctl) { 3959c9e9f97bSIlya Dryomov ret = -ENOMEM; 3960c9e9f97bSIlya Dryomov goto out_bargs; 3961c9e9f97bSIlya Dryomov } 3962c9e9f97bSIlya Dryomov 3963c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3964c9e9f97bSIlya Dryomov if (arg) { 3965c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3966c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3967c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3968c9e9f97bSIlya Dryomov 3969c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3970f43ffb60SIlya Dryomov } else { 3971f43ffb60SIlya Dryomov /* balance everything - no filters */ 3972f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3973c9e9f97bSIlya Dryomov } 3974c9e9f97bSIlya Dryomov 3975de322263SIlya Dryomov do_balance: 3976c9e9f97bSIlya Dryomov /* 3977ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 3978ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 3979ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 3980ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 3981ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 3982c9e9f97bSIlya Dryomov */ 3983ed0fb78fSIlya Dryomov need_unlock = false; 3984ed0fb78fSIlya Dryomov 3985ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3986ed0fb78fSIlya Dryomov 3987c9e9f97bSIlya Dryomov if (arg) { 3988c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3989c9e9f97bSIlya Dryomov ret = -EFAULT; 3990c9e9f97bSIlya Dryomov } 3991c9e9f97bSIlya Dryomov 3992c9e9f97bSIlya Dryomov out_bargs: 3993c9e9f97bSIlya Dryomov kfree(bargs); 3994ed0fb78fSIlya Dryomov out_unlock: 3995c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3996c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3997ed0fb78fSIlya Dryomov if (need_unlock) 3998ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 3999ed0fb78fSIlya Dryomov out: 4000e54bfa31SLiu Bo mnt_drop_write_file(file); 4001c9e9f97bSIlya Dryomov return ret; 4002c9e9f97bSIlya Dryomov } 4003c9e9f97bSIlya Dryomov 4004837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4005837d5b6eSIlya Dryomov { 4006837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4007837d5b6eSIlya Dryomov return -EPERM; 4008837d5b6eSIlya Dryomov 4009837d5b6eSIlya Dryomov switch (cmd) { 4010837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4011837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4012a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4013a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4014837d5b6eSIlya Dryomov } 4015837d5b6eSIlya Dryomov 4016837d5b6eSIlya Dryomov return -EINVAL; 4017837d5b6eSIlya Dryomov } 4018837d5b6eSIlya Dryomov 401919a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 402019a39dceSIlya Dryomov void __user *arg) 402119a39dceSIlya Dryomov { 402219a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 402319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 402419a39dceSIlya Dryomov int ret = 0; 402519a39dceSIlya Dryomov 402619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 402719a39dceSIlya Dryomov return -EPERM; 402819a39dceSIlya Dryomov 402919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 403019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 403119a39dceSIlya Dryomov ret = -ENOTCONN; 403219a39dceSIlya Dryomov goto out; 403319a39dceSIlya Dryomov } 403419a39dceSIlya Dryomov 403519a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 403619a39dceSIlya Dryomov if (!bargs) { 403719a39dceSIlya Dryomov ret = -ENOMEM; 403819a39dceSIlya Dryomov goto out; 403919a39dceSIlya Dryomov } 404019a39dceSIlya Dryomov 404119a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 404219a39dceSIlya Dryomov 404319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 404419a39dceSIlya Dryomov ret = -EFAULT; 404519a39dceSIlya Dryomov 404619a39dceSIlya Dryomov kfree(bargs); 404719a39dceSIlya Dryomov out: 404819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 404919a39dceSIlya Dryomov return ret; 405019a39dceSIlya Dryomov } 405119a39dceSIlya Dryomov 4052905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40535d13a37bSArne Jansen { 4054496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 40555d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40565d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 40575d13a37bSArne Jansen int ret; 40585d13a37bSArne Jansen int err; 40595d13a37bSArne Jansen 40605d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40615d13a37bSArne Jansen return -EPERM; 40625d13a37bSArne Jansen 4063905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4064905b0ddaSMiao Xie if (ret) 4065905b0ddaSMiao Xie return ret; 40665d13a37bSArne Jansen 40675d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4068905b0ddaSMiao Xie if (IS_ERR(sa)) { 4069905b0ddaSMiao Xie ret = PTR_ERR(sa); 4070905b0ddaSMiao Xie goto drop_write; 4071905b0ddaSMiao Xie } 40725d13a37bSArne Jansen 40737708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 407492f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 40755d13a37bSArne Jansen if (IS_ERR(trans)) { 40765d13a37bSArne Jansen ret = PTR_ERR(trans); 40775d13a37bSArne Jansen goto out; 40785d13a37bSArne Jansen } 40795d13a37bSArne Jansen 40805d13a37bSArne Jansen switch (sa->cmd) { 40815d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 40825d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 40835d13a37bSArne Jansen break; 40845d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 40855d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 40865d13a37bSArne Jansen break; 40875d13a37bSArne Jansen default: 40885d13a37bSArne Jansen ret = -EINVAL; 40895d13a37bSArne Jansen break; 40905d13a37bSArne Jansen } 40915d13a37bSArne Jansen 409292f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 40935d13a37bSArne Jansen if (err && !ret) 40945d13a37bSArne Jansen ret = err; 40955d13a37bSArne Jansen out: 40965d13a37bSArne Jansen kfree(sa); 40977708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4098905b0ddaSMiao Xie drop_write: 4099905b0ddaSMiao Xie mnt_drop_write_file(file); 41005d13a37bSArne Jansen return ret; 41015d13a37bSArne Jansen } 41025d13a37bSArne Jansen 4103905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41045d13a37bSArne Jansen { 4105496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41065d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41075d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41085d13a37bSArne Jansen int ret; 41095d13a37bSArne Jansen int err; 41105d13a37bSArne Jansen 41115d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41125d13a37bSArne Jansen return -EPERM; 41135d13a37bSArne Jansen 4114905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4115905b0ddaSMiao Xie if (ret) 4116905b0ddaSMiao Xie return ret; 41175d13a37bSArne Jansen 41185d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4119905b0ddaSMiao Xie if (IS_ERR(sa)) { 4120905b0ddaSMiao Xie ret = PTR_ERR(sa); 4121905b0ddaSMiao Xie goto drop_write; 4122905b0ddaSMiao Xie } 41235d13a37bSArne Jansen 41245d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41255d13a37bSArne Jansen if (IS_ERR(trans)) { 41265d13a37bSArne Jansen ret = PTR_ERR(trans); 41275d13a37bSArne Jansen goto out; 41285d13a37bSArne Jansen } 41295d13a37bSArne Jansen 41305d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41315d13a37bSArne Jansen if (sa->assign) { 41325d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 41335d13a37bSArne Jansen sa->src, sa->dst); 41345d13a37bSArne Jansen } else { 41355d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 41365d13a37bSArne Jansen sa->src, sa->dst); 41375d13a37bSArne Jansen } 41385d13a37bSArne Jansen 41395d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41405d13a37bSArne Jansen if (err && !ret) 41415d13a37bSArne Jansen ret = err; 41425d13a37bSArne Jansen 41435d13a37bSArne Jansen out: 41445d13a37bSArne Jansen kfree(sa); 4145905b0ddaSMiao Xie drop_write: 4146905b0ddaSMiao Xie mnt_drop_write_file(file); 41475d13a37bSArne Jansen return ret; 41485d13a37bSArne Jansen } 41495d13a37bSArne Jansen 4150905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41515d13a37bSArne Jansen { 4152496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41535d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41545d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41555d13a37bSArne Jansen int ret; 41565d13a37bSArne Jansen int err; 41575d13a37bSArne Jansen 41585d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41595d13a37bSArne Jansen return -EPERM; 41605d13a37bSArne Jansen 4161905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4162905b0ddaSMiao Xie if (ret) 4163905b0ddaSMiao Xie return ret; 41645d13a37bSArne Jansen 41655d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4166905b0ddaSMiao Xie if (IS_ERR(sa)) { 4167905b0ddaSMiao Xie ret = PTR_ERR(sa); 4168905b0ddaSMiao Xie goto drop_write; 4169905b0ddaSMiao Xie } 41705d13a37bSArne Jansen 4171d86e56cfSMiao Xie if (!sa->qgroupid) { 4172d86e56cfSMiao Xie ret = -EINVAL; 4173d86e56cfSMiao Xie goto out; 4174d86e56cfSMiao Xie } 4175d86e56cfSMiao Xie 41765d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41775d13a37bSArne Jansen if (IS_ERR(trans)) { 41785d13a37bSArne Jansen ret = PTR_ERR(trans); 41795d13a37bSArne Jansen goto out; 41805d13a37bSArne Jansen } 41815d13a37bSArne Jansen 41825d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41835d13a37bSArne Jansen if (sa->create) { 41845d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 41855d13a37bSArne Jansen NULL); 41865d13a37bSArne Jansen } else { 41875d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 41885d13a37bSArne Jansen } 41895d13a37bSArne Jansen 41905d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41915d13a37bSArne Jansen if (err && !ret) 41925d13a37bSArne Jansen ret = err; 41935d13a37bSArne Jansen 41945d13a37bSArne Jansen out: 41955d13a37bSArne Jansen kfree(sa); 4196905b0ddaSMiao Xie drop_write: 4197905b0ddaSMiao Xie mnt_drop_write_file(file); 41985d13a37bSArne Jansen return ret; 41995d13a37bSArne Jansen } 42005d13a37bSArne Jansen 4201905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42025d13a37bSArne Jansen { 4203496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42065d13a37bSArne Jansen int ret; 42075d13a37bSArne Jansen int err; 42085d13a37bSArne Jansen u64 qgroupid; 42095d13a37bSArne Jansen 42105d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42115d13a37bSArne Jansen return -EPERM; 42125d13a37bSArne Jansen 4213905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4214905b0ddaSMiao Xie if (ret) 4215905b0ddaSMiao Xie return ret; 42165d13a37bSArne Jansen 42175d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4218905b0ddaSMiao Xie if (IS_ERR(sa)) { 4219905b0ddaSMiao Xie ret = PTR_ERR(sa); 4220905b0ddaSMiao Xie goto drop_write; 4221905b0ddaSMiao Xie } 42225d13a37bSArne Jansen 42235d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42245d13a37bSArne Jansen if (IS_ERR(trans)) { 42255d13a37bSArne Jansen ret = PTR_ERR(trans); 42265d13a37bSArne Jansen goto out; 42275d13a37bSArne Jansen } 42285d13a37bSArne Jansen 42295d13a37bSArne Jansen qgroupid = sa->qgroupid; 42305d13a37bSArne Jansen if (!qgroupid) { 42315d13a37bSArne Jansen /* take the current subvol as qgroup */ 42325d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42335d13a37bSArne Jansen } 42345d13a37bSArne Jansen 42355d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42365d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 42375d13a37bSArne Jansen 42385d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42395d13a37bSArne Jansen if (err && !ret) 42405d13a37bSArne Jansen ret = err; 42415d13a37bSArne Jansen 42425d13a37bSArne Jansen out: 42435d13a37bSArne Jansen kfree(sa); 4244905b0ddaSMiao Xie drop_write: 4245905b0ddaSMiao Xie mnt_drop_write_file(file); 42465d13a37bSArne Jansen return ret; 42475d13a37bSArne Jansen } 42485d13a37bSArne Jansen 42492f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42502f232036SJan Schmidt { 42516d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42522f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42532f232036SJan Schmidt int ret; 42542f232036SJan Schmidt 42552f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42562f232036SJan Schmidt return -EPERM; 42572f232036SJan Schmidt 42582f232036SJan Schmidt ret = mnt_want_write_file(file); 42592f232036SJan Schmidt if (ret) 42602f232036SJan Schmidt return ret; 42612f232036SJan Schmidt 42622f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42632f232036SJan Schmidt if (IS_ERR(qsa)) { 42642f232036SJan Schmidt ret = PTR_ERR(qsa); 42652f232036SJan Schmidt goto drop_write; 42662f232036SJan Schmidt } 42672f232036SJan Schmidt 42682f232036SJan Schmidt if (qsa->flags) { 42692f232036SJan Schmidt ret = -EINVAL; 42702f232036SJan Schmidt goto out; 42712f232036SJan Schmidt } 42722f232036SJan Schmidt 42732f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 42742f232036SJan Schmidt 42752f232036SJan Schmidt out: 42762f232036SJan Schmidt kfree(qsa); 42772f232036SJan Schmidt drop_write: 42782f232036SJan Schmidt mnt_drop_write_file(file); 42792f232036SJan Schmidt return ret; 42802f232036SJan Schmidt } 42812f232036SJan Schmidt 42822f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 42832f232036SJan Schmidt { 42846d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42852f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42862f232036SJan Schmidt int ret = 0; 42872f232036SJan Schmidt 42882f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42892f232036SJan Schmidt return -EPERM; 42902f232036SJan Schmidt 42912f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 42922f232036SJan Schmidt if (!qsa) 42932f232036SJan Schmidt return -ENOMEM; 42942f232036SJan Schmidt 42952f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 42962f232036SJan Schmidt qsa->flags = 1; 42972f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 42982f232036SJan Schmidt } 42992f232036SJan Schmidt 43002f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43012f232036SJan Schmidt ret = -EFAULT; 43022f232036SJan Schmidt 43032f232036SJan Schmidt kfree(qsa); 43042f232036SJan Schmidt return ret; 43052f232036SJan Schmidt } 43062f232036SJan Schmidt 430757254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 430857254b6eSJan Schmidt { 430954563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 431057254b6eSJan Schmidt 431157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 431257254b6eSJan Schmidt return -EPERM; 431357254b6eSJan Schmidt 431457254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 431557254b6eSJan Schmidt } 431657254b6eSJan Schmidt 43178ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 43188ea05e3aSAlexander Block void __user *arg) 43198ea05e3aSAlexander Block { 43208ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 4321496ad9aaSAl Viro struct inode *inode = file_inode(file); 43228ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43238ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43248ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 43258ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 43268ea05e3aSAlexander Block int ret = 0; 4327dd5f9615SStefan Behrens int received_uuid_changed; 43288ea05e3aSAlexander Block 43298ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43308ea05e3aSAlexander Block if (ret < 0) 43318ea05e3aSAlexander Block return ret; 43328ea05e3aSAlexander Block 43338ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 43348ea05e3aSAlexander Block 43358ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 43368ea05e3aSAlexander Block ret = -EINVAL; 43378ea05e3aSAlexander Block goto out; 43388ea05e3aSAlexander Block } 43398ea05e3aSAlexander Block 43408ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43418ea05e3aSAlexander Block ret = -EROFS; 43428ea05e3aSAlexander Block goto out; 43438ea05e3aSAlexander Block } 43448ea05e3aSAlexander Block 43458ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 43468ea05e3aSAlexander Block ret = -EACCES; 43478ea05e3aSAlexander Block goto out; 43488ea05e3aSAlexander Block } 43498ea05e3aSAlexander Block 43508ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 43518ea05e3aSAlexander Block if (IS_ERR(sa)) { 43528ea05e3aSAlexander Block ret = PTR_ERR(sa); 43538ea05e3aSAlexander Block sa = NULL; 43548ea05e3aSAlexander Block goto out; 43558ea05e3aSAlexander Block } 43568ea05e3aSAlexander Block 4357dd5f9615SStefan Behrens /* 4358dd5f9615SStefan Behrens * 1 - root item 4359dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4360dd5f9615SStefan Behrens */ 4361dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43628ea05e3aSAlexander Block if (IS_ERR(trans)) { 43638ea05e3aSAlexander Block ret = PTR_ERR(trans); 43648ea05e3aSAlexander Block trans = NULL; 43658ea05e3aSAlexander Block goto out; 43668ea05e3aSAlexander Block } 43678ea05e3aSAlexander Block 43688ea05e3aSAlexander Block sa->rtransid = trans->transid; 43698ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43708ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43718ea05e3aSAlexander Block 4372dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4373dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4374dd5f9615SStefan Behrens if (received_uuid_changed && 4375dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4376dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4377dd5f9615SStefan Behrens root_item->received_uuid, 4378dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4379dd5f9615SStefan Behrens root->root_key.objectid); 43808ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43818ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43828ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43833cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43843cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 43853cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 43863cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 43878ea05e3aSAlexander Block 43888ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 43898ea05e3aSAlexander Block &root->root_key, &root->root_item); 43908ea05e3aSAlexander Block if (ret < 0) { 43918ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 43928ea05e3aSAlexander Block goto out; 4393dd5f9615SStefan Behrens } 4394dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4395dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4396dd5f9615SStefan Behrens sa->uuid, 4397dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4398dd5f9615SStefan Behrens root->root_key.objectid); 4399dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4400dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4401dd5f9615SStefan Behrens goto out; 4402dd5f9615SStefan Behrens } 4403dd5f9615SStefan Behrens } 44048ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4405dd5f9615SStefan Behrens if (ret < 0) { 4406dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44078ea05e3aSAlexander Block goto out; 44088ea05e3aSAlexander Block } 44098ea05e3aSAlexander Block 44108ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44118ea05e3aSAlexander Block if (ret) 44128ea05e3aSAlexander Block ret = -EFAULT; 44138ea05e3aSAlexander Block 44148ea05e3aSAlexander Block out: 44158ea05e3aSAlexander Block kfree(sa); 44168ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 44178ea05e3aSAlexander Block mnt_drop_write_file(file); 44188ea05e3aSAlexander Block return ret; 44198ea05e3aSAlexander Block } 44208ea05e3aSAlexander Block 4421867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4422867ab667Sjeff.liu { 44236d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4424a1b83ac5SAnand Jain size_t len; 4425867ab667Sjeff.liu int ret; 4426a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4427a1b83ac5SAnand Jain 4428a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4429a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4430a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4431a1b83ac5SAnand Jain 4432a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4433867ab667Sjeff.liu 4434867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4435867ab667Sjeff.liu pr_warn("btrfs: label is too long, return the first %zu bytes\n", 4436867ab667Sjeff.liu --len); 4437867ab667Sjeff.liu } 4438867ab667Sjeff.liu 4439867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4440867ab667Sjeff.liu 4441867ab667Sjeff.liu return ret ? -EFAULT : 0; 4442867ab667Sjeff.liu } 4443867ab667Sjeff.liu 4444a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4445a8bfd4abSjeff.liu { 44466d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4447a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4448a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4449a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4450a8bfd4abSjeff.liu int ret; 4451a8bfd4abSjeff.liu 4452a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4453a8bfd4abSjeff.liu return -EPERM; 4454a8bfd4abSjeff.liu 4455a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4456a8bfd4abSjeff.liu return -EFAULT; 4457a8bfd4abSjeff.liu 4458a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4459a8bfd4abSjeff.liu pr_err("btrfs: unable to set label with more than %d bytes\n", 4460a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4461a8bfd4abSjeff.liu return -EINVAL; 4462a8bfd4abSjeff.liu } 4463a8bfd4abSjeff.liu 4464a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4465a8bfd4abSjeff.liu if (ret) 4466a8bfd4abSjeff.liu return ret; 4467a8bfd4abSjeff.liu 4468a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4469a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4470a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4471a8bfd4abSjeff.liu goto out_unlock; 4472a8bfd4abSjeff.liu } 4473a8bfd4abSjeff.liu 4474a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4475a8bfd4abSjeff.liu strcpy(super_block->label, label); 4476a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4477a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4478a8bfd4abSjeff.liu 4479a8bfd4abSjeff.liu out_unlock: 4480a8bfd4abSjeff.liu mnt_drop_write_file(file); 4481a8bfd4abSjeff.liu return ret; 4482a8bfd4abSjeff.liu } 4483a8bfd4abSjeff.liu 44842eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 44852eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 44862eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 44872eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 44882eaa055fSJeff Mahoney 44892eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 44902eaa055fSJeff Mahoney void __user *arg) 44912eaa055fSJeff Mahoney { 44922eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 44932eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 44942eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 44952eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 44962eaa055fSJeff Mahoney }; 44972eaa055fSJeff Mahoney 44982eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 44992eaa055fSJeff Mahoney return -EFAULT; 45002eaa055fSJeff Mahoney 45012eaa055fSJeff Mahoney return 0; 45022eaa055fSJeff Mahoney } 45032eaa055fSJeff Mahoney 45042eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 45052eaa055fSJeff Mahoney { 45062eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45072eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 45082eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 45092eaa055fSJeff Mahoney 45102eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 45112eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 45122eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 45132eaa055fSJeff Mahoney 45142eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45152eaa055fSJeff Mahoney return -EFAULT; 45162eaa055fSJeff Mahoney 45172eaa055fSJeff Mahoney return 0; 45182eaa055fSJeff Mahoney } 45192eaa055fSJeff Mahoney 45203b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 45213b02a68aSJeff Mahoney enum btrfs_feature_set set, 45222eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 45232eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 45242eaa055fSJeff Mahoney { 45253b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 45263b02a68aSJeff Mahoney char *names; 45272eaa055fSJeff Mahoney u64 disallowed, unsupported; 45282eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 45292eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 45302eaa055fSJeff Mahoney 45312eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 45322eaa055fSJeff Mahoney if (unsupported) { 45333b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 45343b02a68aSJeff Mahoney if (names) { 45353b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 45363b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 45373b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 45383b02a68aSJeff Mahoney kfree(names); 45393b02a68aSJeff Mahoney } else 45402eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 45412eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 45422eaa055fSJeff Mahoney type, unsupported); 45432eaa055fSJeff Mahoney return -EOPNOTSUPP; 45442eaa055fSJeff Mahoney } 45452eaa055fSJeff Mahoney 45462eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 45472eaa055fSJeff Mahoney if (disallowed) { 45483b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 45493b02a68aSJeff Mahoney if (names) { 45503b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 45513b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 45523b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 45533b02a68aSJeff Mahoney kfree(names); 45543b02a68aSJeff Mahoney } else 45552eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 45562eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 45572eaa055fSJeff Mahoney type, disallowed); 45582eaa055fSJeff Mahoney return -EPERM; 45592eaa055fSJeff Mahoney } 45602eaa055fSJeff Mahoney 45612eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 45622eaa055fSJeff Mahoney if (disallowed) { 45633b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 45643b02a68aSJeff Mahoney if (names) { 45653b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 45663b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 45673b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 45683b02a68aSJeff Mahoney kfree(names); 45693b02a68aSJeff Mahoney } else 45702eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 45712eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 45722eaa055fSJeff Mahoney type, disallowed); 45732eaa055fSJeff Mahoney return -EPERM; 45742eaa055fSJeff Mahoney } 45752eaa055fSJeff Mahoney 45762eaa055fSJeff Mahoney return 0; 45772eaa055fSJeff Mahoney } 45782eaa055fSJeff Mahoney 45792eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 45803b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 45812eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 45822eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 45832eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 45842eaa055fSJeff Mahoney 45852eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 45862eaa055fSJeff Mahoney { 45872eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45882eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 45892eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 45902eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 45912eaa055fSJeff Mahoney u64 newflags; 45922eaa055fSJeff Mahoney int ret; 45932eaa055fSJeff Mahoney 45942eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 45952eaa055fSJeff Mahoney return -EPERM; 45962eaa055fSJeff Mahoney 45972eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 45982eaa055fSJeff Mahoney return -EFAULT; 45992eaa055fSJeff Mahoney 46002eaa055fSJeff Mahoney /* Nothing to do */ 46012eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 46022eaa055fSJeff Mahoney !flags[0].incompat_flags) 46032eaa055fSJeff Mahoney return 0; 46042eaa055fSJeff Mahoney 46052eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 46062eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 46072eaa055fSJeff Mahoney if (ret) 46082eaa055fSJeff Mahoney return ret; 46092eaa055fSJeff Mahoney 46102eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 46112eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 46122eaa055fSJeff Mahoney if (ret) 46132eaa055fSJeff Mahoney return ret; 46142eaa055fSJeff Mahoney 46152eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 46162eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 46172eaa055fSJeff Mahoney if (ret) 46182eaa055fSJeff Mahoney return ret; 46192eaa055fSJeff Mahoney 46202eaa055fSJeff Mahoney trans = btrfs_start_transaction(root, 1); 46212eaa055fSJeff Mahoney if (IS_ERR(trans)) 46222eaa055fSJeff Mahoney return PTR_ERR(trans); 46232eaa055fSJeff Mahoney 46242eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 46252eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 46262eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 46272eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 46282eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 46292eaa055fSJeff Mahoney 46302eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 46312eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 46322eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 46332eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 46342eaa055fSJeff Mahoney 46352eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 46362eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 46372eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 46382eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 46392eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 46402eaa055fSJeff Mahoney 46412eaa055fSJeff Mahoney return btrfs_end_transaction(trans, root); 46422eaa055fSJeff Mahoney } 46432eaa055fSJeff Mahoney 4644f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4645f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4646f46b5a66SChristoph Hellwig { 4647496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46484bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4649f46b5a66SChristoph Hellwig 4650f46b5a66SChristoph Hellwig switch (cmd) { 46516cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 46526cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 46536cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 46546cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 46556cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 46566cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4657f7039b1dSLi Dongyang case FITRIM: 4658f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4659f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4660fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4661fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4662fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 46633de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4664fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 46656f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 46666f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 466776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 466876dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 46690caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 46700caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 46710caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 46720caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 46736ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 46746ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4675f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 46761e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 46771e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 46781e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4679f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4680198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4681f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 46824bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4683f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4684da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4685475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4686475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4687475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4688475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4689f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 46909ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4691f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4692c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4693c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 46947a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4695f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4696f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4697f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4698f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4699ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4700ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4701ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4702ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4703d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4704d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4705d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4706d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 47071406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 47081406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 47099b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 47109b199859SFilipe David Borba Manana int ret; 47119b199859SFilipe David Borba Manana 471291aef86fSMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0); 47139b199859SFilipe David Borba Manana if (ret) 47149b199859SFilipe David Borba Manana return ret; 47159b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 47169b199859SFilipe David Borba Manana return ret; 47179b199859SFilipe David Borba Manana } 471846204592SSage Weil case BTRFS_IOC_START_SYNC: 47199a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 472046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 47219a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4722475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4723b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4724475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4725475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4726475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4727475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4728c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 47299ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4730837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4731837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 473219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 473319a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 47348ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 47358ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 473631db9f7cSAlexander Block case BTRFS_IOC_SEND: 473731db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4738c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4739b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 47405d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4741905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 47425d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4743905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 47445d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4745905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 47465d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4747905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 47482f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 47492f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 47502f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 47512f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 475257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 475357254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 47543f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 47553f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4756867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4757867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4758a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4759a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4760416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4761416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 47622eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 47632eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 47642eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 47652eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 47662eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 47672eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4768f46b5a66SChristoph Hellwig } 4769f46b5a66SChristoph Hellwig 4770f46b5a66SChristoph Hellwig return -ENOTTY; 4771f46b5a66SChristoph Hellwig } 4772