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> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53f46b5a66SChristoph Hellwig 546cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 556cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 566cbff00fSChristoph Hellwig { 576cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 586cbff00fSChristoph Hellwig return flags; 596cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 606cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 616cbff00fSChristoph Hellwig else 626cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 636cbff00fSChristoph Hellwig } 64f46b5a66SChristoph Hellwig 656cbff00fSChristoph Hellwig /* 666cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 676cbff00fSChristoph Hellwig */ 686cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 696cbff00fSChristoph Hellwig { 706cbff00fSChristoph Hellwig unsigned int iflags = 0; 716cbff00fSChristoph Hellwig 726cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 736cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 756cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 776cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 796cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 816cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 836cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 846cbff00fSChristoph Hellwig 856cbff00fSChristoph Hellwig return iflags; 866cbff00fSChristoph Hellwig } 876cbff00fSChristoph Hellwig 886cbff00fSChristoph Hellwig /* 896cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 906cbff00fSChristoph Hellwig */ 916cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 926cbff00fSChristoph Hellwig { 936cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 986cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 996cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1006cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1016cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1026cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1036cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1046cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1056cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1066cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1076cbff00fSChristoph Hellwig } 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig /* 1106cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1116cbff00fSChristoph Hellwig * 1126cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1136cbff00fSChristoph Hellwig */ 1146cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1156cbff00fSChristoph Hellwig { 1160b4dcea5SChris Mason unsigned int flags; 1170b4dcea5SChris Mason 1180b4dcea5SChris Mason if (!dir) 1190b4dcea5SChris Mason return; 1200b4dcea5SChris Mason 1210b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1226cbff00fSChristoph Hellwig 1236cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1246cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1256cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1266cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1276cbff00fSChristoph Hellwig 1286cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1296cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1336cbff00fSChristoph Hellwig { 1346cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1356cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1386cbff00fSChristoph Hellwig return -EFAULT; 1396cbff00fSChristoph Hellwig return 0; 1406cbff00fSChristoph Hellwig } 1416cbff00fSChristoph Hellwig 14275e7cb7fSLiu Bo static int check_flags(unsigned int flags) 14375e7cb7fSLiu Bo { 14475e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 14575e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 14675e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 14775e7cb7fSLiu Bo FS_NOCOMP_FL | FS_COMPR_FL | \ 14875e7cb7fSLiu Bo FS_NOCOW_FL | FS_COW_FL)) 14975e7cb7fSLiu Bo return -EOPNOTSUPP; 15075e7cb7fSLiu Bo 15175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 15275e7cb7fSLiu Bo return -EINVAL; 15375e7cb7fSLiu Bo 15475e7cb7fSLiu Bo if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) 15575e7cb7fSLiu Bo return -EINVAL; 15675e7cb7fSLiu Bo 15775e7cb7fSLiu Bo return 0; 15875e7cb7fSLiu Bo } 15975e7cb7fSLiu Bo 1606cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1616cbff00fSChristoph Hellwig { 1626cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1636cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1646cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1656cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1666cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1676cbff00fSChristoph Hellwig int ret; 1686cbff00fSChristoph Hellwig 169b83cc969SLi Zefan if (btrfs_root_readonly(root)) 170b83cc969SLi Zefan return -EROFS; 171b83cc969SLi Zefan 1726cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1736cbff00fSChristoph Hellwig return -EFAULT; 1746cbff00fSChristoph Hellwig 17575e7cb7fSLiu Bo ret = check_flags(flags); 17675e7cb7fSLiu Bo if (ret) 17775e7cb7fSLiu Bo return ret; 1786cbff00fSChristoph Hellwig 1796cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1806cbff00fSChristoph Hellwig return -EACCES; 1816cbff00fSChristoph Hellwig 1826cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1836cbff00fSChristoph Hellwig 1846cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1856cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1866cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1876cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1886cbff00fSChristoph Hellwig ret = -EPERM; 1896cbff00fSChristoph Hellwig goto out_unlock; 1906cbff00fSChristoph Hellwig } 1916cbff00fSChristoph Hellwig } 1926cbff00fSChristoph Hellwig 1936cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1946cbff00fSChristoph Hellwig if (ret) 1956cbff00fSChristoph Hellwig goto out_unlock; 1966cbff00fSChristoph Hellwig 1976cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1986cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1996cbff00fSChristoph Hellwig else 2006cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2016cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2026cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2036cbff00fSChristoph Hellwig else 2046cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2056cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2066cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2076cbff00fSChristoph Hellwig else 2086cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2096cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2106cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2116cbff00fSChristoph Hellwig else 2126cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2136cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2146cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2156cbff00fSChristoph Hellwig else 2166cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2176cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2186cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2196cbff00fSChristoph Hellwig else 2206cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2216cbff00fSChristoph Hellwig 22275e7cb7fSLiu Bo /* 22375e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 22475e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 22575e7cb7fSLiu Bo * things smaller. 22675e7cb7fSLiu Bo */ 22775e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 22875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 22975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 23075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 23175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 23275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 23375e7cb7fSLiu Bo } 23475e7cb7fSLiu Bo if (flags & FS_NOCOW_FL) 23575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NODATACOW; 23675e7cb7fSLiu Bo else if (flags & FS_COW_FL) 23775e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NODATACOW; 2386cbff00fSChristoph Hellwig 2396cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2403612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 2416cbff00fSChristoph Hellwig 2426cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2436cbff00fSChristoph Hellwig BUG_ON(ret); 2446cbff00fSChristoph Hellwig 2456cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2466cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2476cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2486cbff00fSChristoph Hellwig 2496cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2506cbff00fSChristoph Hellwig out_unlock: 2516cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2526cbff00fSChristoph Hellwig return 0; 2536cbff00fSChristoph Hellwig } 2546cbff00fSChristoph Hellwig 2556cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2566cbff00fSChristoph Hellwig { 2576cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2586cbff00fSChristoph Hellwig 2596cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2606cbff00fSChristoph Hellwig } 261f46b5a66SChristoph Hellwig 262f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 263f7039b1dSLi Dongyang { 264f7039b1dSLi Dongyang struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; 265f7039b1dSLi Dongyang struct btrfs_fs_info *fs_info = root->fs_info; 266f7039b1dSLi Dongyang struct btrfs_device *device; 267f7039b1dSLi Dongyang struct request_queue *q; 268f7039b1dSLi Dongyang struct fstrim_range range; 269f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 270f7039b1dSLi Dongyang u64 num_devices = 0; 271f7039b1dSLi Dongyang int ret; 272f7039b1dSLi Dongyang 273f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 274f7039b1dSLi Dongyang return -EPERM; 275f7039b1dSLi Dongyang 276f7039b1dSLi Dongyang mutex_lock(&fs_info->fs_devices->device_list_mutex); 277f7039b1dSLi Dongyang list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { 278f7039b1dSLi Dongyang if (!device->bdev) 279f7039b1dSLi Dongyang continue; 280f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 281f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 282f7039b1dSLi Dongyang num_devices++; 283f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 284f7039b1dSLi Dongyang minlen); 285f7039b1dSLi Dongyang } 286f7039b1dSLi Dongyang } 287f7039b1dSLi Dongyang mutex_unlock(&fs_info->fs_devices->device_list_mutex); 288f7039b1dSLi Dongyang if (!num_devices) 289f7039b1dSLi Dongyang return -EOPNOTSUPP; 290f7039b1dSLi Dongyang 291f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 292f7039b1dSLi Dongyang return -EFAULT; 293f7039b1dSLi Dongyang 294f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 295f7039b1dSLi Dongyang ret = btrfs_trim_fs(root, &range); 296f7039b1dSLi Dongyang if (ret < 0) 297f7039b1dSLi Dongyang return ret; 298f7039b1dSLi Dongyang 299f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 300f7039b1dSLi Dongyang return -EFAULT; 301f7039b1dSLi Dongyang 302f7039b1dSLi Dongyang return 0; 303f7039b1dSLi Dongyang } 304f7039b1dSLi Dongyang 305cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 306cb8e7090SChristoph Hellwig struct dentry *dentry, 30772fd032eSSage Weil char *name, int namelen, 30872fd032eSSage Weil u64 *async_transid) 309f46b5a66SChristoph Hellwig { 310f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 311f46b5a66SChristoph Hellwig struct btrfs_key key; 312f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 313f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 314f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 31576dda93cSYan, Zheng struct btrfs_root *new_root; 3166a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 3176a912213SJosef Bacik struct inode *dir; 318f46b5a66SChristoph Hellwig int ret; 319f46b5a66SChristoph Hellwig int err; 320f46b5a66SChristoph Hellwig u64 objectid; 321f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3223de4586cSChris Mason u64 index = 0; 323f46b5a66SChristoph Hellwig 324a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 325a22285a6SYan, Zheng 0, &objectid); 3266a912213SJosef Bacik if (ret) { 3276a912213SJosef Bacik dput(parent); 328a22285a6SYan, Zheng return ret; 3296a912213SJosef Bacik } 3306a912213SJosef Bacik 3316a912213SJosef Bacik dir = parent->d_inode; 3326a912213SJosef Bacik 3339ed74f2dSJosef Bacik /* 3349ed74f2dSJosef Bacik * 1 - inode item 3359ed74f2dSJosef Bacik * 2 - refs 3369ed74f2dSJosef Bacik * 1 - root item 3379ed74f2dSJosef Bacik * 2 - dir items 3389ed74f2dSJosef Bacik */ 339a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3406a912213SJosef Bacik if (IS_ERR(trans)) { 3416a912213SJosef Bacik dput(parent); 342a22285a6SYan, Zheng return PTR_ERR(trans); 3436a912213SJosef Bacik } 344f46b5a66SChristoph Hellwig 3455d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3465d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 3478e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3488e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3498e8a1e31SJosef Bacik goto fail; 3508e8a1e31SJosef Bacik } 351f46b5a66SChristoph Hellwig 3525d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 353f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 354f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3555d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 356f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 357f46b5a66SChristoph Hellwig 358f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 359f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 360f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3615d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3625d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3635d4f98a2SYan Zheng BTRFS_UUID_SIZE); 364f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 365f46b5a66SChristoph Hellwig 366f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 367f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 368f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 369f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 370f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 371a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 372f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 373f46b5a66SChristoph Hellwig 374f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 37584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 376f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 377f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 37886b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 37980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 380f46b5a66SChristoph Hellwig 381f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 382f46b5a66SChristoph Hellwig root_item.drop_level = 0; 383f46b5a66SChristoph Hellwig 384925baeddSChris Mason btrfs_tree_unlock(leaf); 385f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 386f46b5a66SChristoph Hellwig leaf = NULL; 387f46b5a66SChristoph Hellwig 388f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 389f46b5a66SChristoph Hellwig 390f46b5a66SChristoph Hellwig key.objectid = objectid; 3915d4f98a2SYan Zheng key.offset = 0; 392f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 393f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 394f46b5a66SChristoph Hellwig &root_item); 395f46b5a66SChristoph Hellwig if (ret) 396f46b5a66SChristoph Hellwig goto fail; 397f46b5a66SChristoph Hellwig 39876dda93cSYan, Zheng key.offset = (u64)-1; 39976dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 40076dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 40176dda93cSYan, Zheng 40276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 40376dda93cSYan, Zheng 40476dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 40576dda93cSYan, Zheng BTRFS_I(dir)->block_group); 406f46b5a66SChristoph Hellwig /* 407f46b5a66SChristoph Hellwig * insert the directory item 408f46b5a66SChristoph Hellwig */ 4093de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 4103de4586cSChris Mason BUG_ON(ret); 4113de4586cSChris Mason 4123de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 413f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 4143de4586cSChris Mason BTRFS_FT_DIR, index); 415f46b5a66SChristoph Hellwig if (ret) 416f46b5a66SChristoph Hellwig goto fail; 4170660b5afSChris Mason 41852c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 41952c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 42052c26179SYan Zheng BUG_ON(ret); 42152c26179SYan Zheng 4220660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4234df27c4dSYan, Zheng objectid, root->root_key.objectid, 4240660b5afSChris Mason dir->i_ino, index, name, namelen); 42576dda93cSYan, Zheng 4260660b5afSChris Mason BUG_ON(ret); 4270660b5afSChris Mason 42876dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 429f46b5a66SChristoph Hellwig fail: 4306a912213SJosef Bacik dput(parent); 43172fd032eSSage Weil if (async_transid) { 43272fd032eSSage Weil *async_transid = trans->transid; 43372fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 43472fd032eSSage Weil } else { 43576dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 43672fd032eSSage Weil } 437f46b5a66SChristoph Hellwig if (err && !ret) 438f46b5a66SChristoph Hellwig ret = err; 439f46b5a66SChristoph Hellwig return ret; 440f46b5a66SChristoph Hellwig } 441f46b5a66SChristoph Hellwig 44272fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 443b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 444b83cc969SLi Zefan bool readonly) 445f46b5a66SChristoph Hellwig { 4462e4bfab9SYan, Zheng struct inode *inode; 4476a912213SJosef Bacik struct dentry *parent; 448f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 449f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4502e4bfab9SYan, Zheng int ret; 451f46b5a66SChristoph Hellwig 452f46b5a66SChristoph Hellwig if (!root->ref_cows) 453f46b5a66SChristoph Hellwig return -EINVAL; 454f46b5a66SChristoph Hellwig 455a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 456a22285a6SYan, Zheng if (!pending_snapshot) 457a22285a6SYan, Zheng return -ENOMEM; 458a22285a6SYan, Zheng 459a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 460a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 461a22285a6SYan, Zheng pending_snapshot->root = root; 462b83cc969SLi Zefan pending_snapshot->readonly = readonly; 463a22285a6SYan, Zheng 464a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 465a22285a6SYan, Zheng if (IS_ERR(trans)) { 466a22285a6SYan, Zheng ret = PTR_ERR(trans); 467a22285a6SYan, Zheng goto fail; 468a22285a6SYan, Zheng } 469a22285a6SYan, Zheng 470a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 471a22285a6SYan, Zheng BUG_ON(ret); 472a22285a6SYan, Zheng 473a22285a6SYan, Zheng list_add(&pending_snapshot->list, 474a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 47572fd032eSSage Weil if (async_transid) { 47672fd032eSSage Weil *async_transid = trans->transid; 47772fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 47872fd032eSSage Weil root->fs_info->extent_root, 1); 47972fd032eSSage Weil } else { 48072fd032eSSage Weil ret = btrfs_commit_transaction(trans, 48172fd032eSSage Weil root->fs_info->extent_root); 48272fd032eSSage Weil } 483a22285a6SYan, Zheng BUG_ON(ret); 484a22285a6SYan, Zheng 485a22285a6SYan, Zheng ret = pending_snapshot->error; 486f46b5a66SChristoph Hellwig if (ret) 4872e4bfab9SYan, Zheng goto fail; 488f46b5a66SChristoph Hellwig 48966b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 49066b4ffd1SJosef Bacik if (ret) 49166b4ffd1SJosef Bacik goto fail; 492f46b5a66SChristoph Hellwig 4936a912213SJosef Bacik parent = dget_parent(dentry); 4946a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 4956a912213SJosef Bacik dput(parent); 4962e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4972e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4982e4bfab9SYan, Zheng goto fail; 4992e4bfab9SYan, Zheng } 5002e4bfab9SYan, Zheng BUG_ON(!inode); 5012e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5022e4bfab9SYan, Zheng ret = 0; 5032e4bfab9SYan, Zheng fail: 504a22285a6SYan, Zheng kfree(pending_snapshot); 505f46b5a66SChristoph Hellwig return ret; 506f46b5a66SChristoph Hellwig } 507f46b5a66SChristoph Hellwig 5084260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5094260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5104260f7c7SSage Weil * minimal. 5114260f7c7SSage Weil */ 5124260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5134260f7c7SSage Weil { 5144260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5154260f7c7SSage Weil 5164260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5174260f7c7SSage Weil return 0; 5184260f7c7SSage Weil if (inode->i_uid == fsuid) 5194260f7c7SSage Weil return 0; 5204260f7c7SSage Weil if (dir->i_uid == fsuid) 5214260f7c7SSage Weil return 0; 5224260f7c7SSage Weil return !capable(CAP_FOWNER); 5234260f7c7SSage Weil } 5244260f7c7SSage Weil 5254260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5264260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5274260f7c7SSage Weil * whether the type of victim is right. 5284260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5294260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5304260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5314260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5324260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5334260f7c7SSage Weil * a. be owner of dir, or 5344260f7c7SSage Weil * b. be owner of victim, or 5354260f7c7SSage Weil * c. have CAP_FOWNER capability 5364260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5374260f7c7SSage Weil * links pointing to it. 5384260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5394260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5404260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5414260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5424260f7c7SSage Weil * nfs_async_unlink(). 5434260f7c7SSage Weil */ 5444260f7c7SSage Weil 5454260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5464260f7c7SSage Weil { 5474260f7c7SSage Weil int error; 5484260f7c7SSage Weil 5494260f7c7SSage Weil if (!victim->d_inode) 5504260f7c7SSage Weil return -ENOENT; 5514260f7c7SSage Weil 5524260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5534260f7c7SSage Weil audit_inode_child(victim, dir); 5544260f7c7SSage Weil 5554260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5564260f7c7SSage Weil if (error) 5574260f7c7SSage Weil return error; 5584260f7c7SSage Weil if (IS_APPEND(dir)) 5594260f7c7SSage Weil return -EPERM; 5604260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 5614260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 5624260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 5634260f7c7SSage Weil return -EPERM; 5644260f7c7SSage Weil if (isdir) { 5654260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 5664260f7c7SSage Weil return -ENOTDIR; 5674260f7c7SSage Weil if (IS_ROOT(victim)) 5684260f7c7SSage Weil return -EBUSY; 5694260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 5704260f7c7SSage Weil return -EISDIR; 5714260f7c7SSage Weil if (IS_DEADDIR(dir)) 5724260f7c7SSage Weil return -ENOENT; 5734260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 5744260f7c7SSage Weil return -EBUSY; 5754260f7c7SSage Weil return 0; 5764260f7c7SSage Weil } 5774260f7c7SSage Weil 578cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 579cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 580cb8e7090SChristoph Hellwig { 581cb8e7090SChristoph Hellwig if (child->d_inode) 582cb8e7090SChristoph Hellwig return -EEXIST; 583cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 584cb8e7090SChristoph Hellwig return -ENOENT; 585cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 586cb8e7090SChristoph Hellwig } 587cb8e7090SChristoph Hellwig 588cb8e7090SChristoph Hellwig /* 589cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 590cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 591cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 592cb8e7090SChristoph Hellwig */ 59376dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 59476dda93cSYan, Zheng char *name, int namelen, 59572fd032eSSage Weil struct btrfs_root *snap_src, 596b83cc969SLi Zefan u64 *async_transid, bool readonly) 597cb8e7090SChristoph Hellwig { 59876dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 599cb8e7090SChristoph Hellwig struct dentry *dentry; 600cb8e7090SChristoph Hellwig int error; 601cb8e7090SChristoph Hellwig 60276dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 603cb8e7090SChristoph Hellwig 604cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 605cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 606cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 607cb8e7090SChristoph Hellwig goto out_unlock; 608cb8e7090SChristoph Hellwig 609cb8e7090SChristoph Hellwig error = -EEXIST; 610cb8e7090SChristoph Hellwig if (dentry->d_inode) 611cb8e7090SChristoph Hellwig goto out_dput; 612cb8e7090SChristoph Hellwig 613cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 614cb8e7090SChristoph Hellwig if (error) 615cb8e7090SChristoph Hellwig goto out_dput; 616cb8e7090SChristoph Hellwig 61776dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 618cb8e7090SChristoph Hellwig if (error) 619cb8e7090SChristoph Hellwig goto out_drop_write; 620cb8e7090SChristoph Hellwig 62176dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 62276dda93cSYan, Zheng 62376dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 62476dda93cSYan, Zheng goto out_up_read; 62576dda93cSYan, Zheng 6263de4586cSChris Mason if (snap_src) { 62772fd032eSSage Weil error = create_snapshot(snap_src, dentry, 628b83cc969SLi Zefan name, namelen, async_transid, readonly); 6293de4586cSChris Mason } else { 63076dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 63172fd032eSSage Weil name, namelen, async_transid); 6323de4586cSChris Mason } 63376dda93cSYan, Zheng if (!error) 63476dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 63576dda93cSYan, Zheng out_up_read: 63676dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 637cb8e7090SChristoph Hellwig out_drop_write: 638cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 639cb8e7090SChristoph Hellwig out_dput: 640cb8e7090SChristoph Hellwig dput(dentry); 641cb8e7090SChristoph Hellwig out_unlock: 64276dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 643cb8e7090SChristoph Hellwig return error; 644cb8e7090SChristoph Hellwig } 645cb8e7090SChristoph Hellwig 646940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 6471e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 6481e701a32SChris Mason u64 *defrag_end) 649940100a4SChris Mason { 650940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 651940100a4SChris Mason struct extent_map *em = NULL; 652940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 653940100a4SChris Mason int ret = 1; 654940100a4SChris Mason 6551e701a32SChris Mason 6561e701a32SChris Mason if (thresh == 0) 6571e701a32SChris Mason thresh = 256 * 1024; 6581e701a32SChris Mason 659940100a4SChris Mason /* 660940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 661940100a4SChris Mason * defragging it 662940100a4SChris Mason */ 663940100a4SChris Mason if (start < *defrag_end) 664940100a4SChris Mason return 1; 665940100a4SChris Mason 666940100a4SChris Mason *skip = 0; 667940100a4SChris Mason 668940100a4SChris Mason /* 669940100a4SChris Mason * hopefully we have this extent in the tree already, try without 670940100a4SChris Mason * the full extent lock 671940100a4SChris Mason */ 672940100a4SChris Mason read_lock(&em_tree->lock); 673940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 674940100a4SChris Mason read_unlock(&em_tree->lock); 675940100a4SChris Mason 676940100a4SChris Mason if (!em) { 677940100a4SChris Mason /* get the big lock and read metadata off disk */ 678940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 679940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 680940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 681940100a4SChris Mason 6826cf8bfbfSDan Carpenter if (IS_ERR(em)) 683940100a4SChris Mason return 0; 684940100a4SChris Mason } 685940100a4SChris Mason 686940100a4SChris Mason /* this will cover holes, and inline extents */ 687940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 688940100a4SChris Mason ret = 0; 689940100a4SChris Mason 690940100a4SChris Mason /* 691940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 692940100a4SChris Mason */ 6931e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 694940100a4SChris Mason ret = 0; 695940100a4SChris Mason 696940100a4SChris Mason /* 697940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 698940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 699940100a4SChris Mason * so that the next tiny extent will force a defrag. 700940100a4SChris Mason * 701940100a4SChris Mason * The end result of this is that tiny extents before a single big 702940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 703940100a4SChris Mason */ 704940100a4SChris Mason if (ret) { 705940100a4SChris Mason *last_len += len; 706940100a4SChris Mason *defrag_end = extent_map_end(em); 707940100a4SChris Mason } else { 708940100a4SChris Mason *last_len = 0; 709940100a4SChris Mason *skip = extent_map_end(em); 710940100a4SChris Mason *defrag_end = 0; 711940100a4SChris Mason } 712940100a4SChris Mason 713940100a4SChris Mason free_extent_map(em); 714940100a4SChris Mason return ret; 715940100a4SChris Mason } 716940100a4SChris Mason 7171e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 7181e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 719f46b5a66SChristoph Hellwig { 720f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 721f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 722f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7233eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 724f46b5a66SChristoph Hellwig struct page *page; 7251a419d85SLi Zefan struct btrfs_super_block *disk_super; 726f46b5a66SChristoph Hellwig unsigned long last_index; 727f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 728f46b5a66SChristoph Hellwig unsigned long total_read = 0; 7291a419d85SLi Zefan u64 features; 730f46b5a66SChristoph Hellwig u64 page_start; 731f46b5a66SChristoph Hellwig u64 page_end; 732940100a4SChris Mason u64 last_len = 0; 733940100a4SChris Mason u64 skip = 0; 734940100a4SChris Mason u64 defrag_end = 0; 735f46b5a66SChristoph Hellwig unsigned long i; 736f46b5a66SChristoph Hellwig int ret; 7371a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 7381a419d85SLi Zefan 7391a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 7401a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 7411a419d85SLi Zefan return -EINVAL; 7421a419d85SLi Zefan if (range->compress_type) 7431a419d85SLi Zefan compress_type = range->compress_type; 7441a419d85SLi Zefan } 745f46b5a66SChristoph Hellwig 746940100a4SChris Mason if (inode->i_size == 0) 747940100a4SChris Mason return 0; 748f46b5a66SChristoph Hellwig 7491e701a32SChris Mason if (range->start + range->len > range->start) { 7501e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 7511e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 7521e701a32SChris Mason } else { 753940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 7541e701a32SChris Mason } 7551e701a32SChris Mason 7561e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 757940100a4SChris Mason while (i <= last_index) { 758940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 7591e701a32SChris Mason PAGE_CACHE_SIZE, 7601e701a32SChris Mason range->extent_thresh, 7611e701a32SChris Mason &last_len, &skip, 762940100a4SChris Mason &defrag_end)) { 763940100a4SChris Mason unsigned long next; 764940100a4SChris Mason /* 765940100a4SChris Mason * the should_defrag function tells us how much to skip 766940100a4SChris Mason * bump our counter by the suggested amount 767940100a4SChris Mason */ 768940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 769940100a4SChris Mason i = max(i + 1, next); 770940100a4SChris Mason continue; 771940100a4SChris Mason } 772940100a4SChris Mason 773f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 774f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 775f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 776f46b5a66SChristoph Hellwig } 777f46b5a66SChristoph Hellwig total_read++; 778940100a4SChris Mason mutex_lock(&inode->i_mutex); 7791e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 7801a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 781940100a4SChris Mason 7820ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 7830ca1f7ceSYan, Zheng if (ret) 7840ca1f7ceSYan, Zheng goto err_unlock; 7853eaa2885SChris Mason again: 786940100a4SChris Mason if (inode->i_size == 0 || 787940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 788940100a4SChris Mason ret = 0; 789940100a4SChris Mason goto err_reservations; 790940100a4SChris Mason } 791940100a4SChris Mason 792f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 7930ca1f7ceSYan, Zheng if (!page) { 7940ca1f7ceSYan, Zheng ret = -ENOMEM; 795940100a4SChris Mason goto err_reservations; 7960ca1f7ceSYan, Zheng } 797940100a4SChris Mason 798f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 799f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 800f46b5a66SChristoph Hellwig lock_page(page); 801f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 802f46b5a66SChristoph Hellwig unlock_page(page); 803f46b5a66SChristoph Hellwig page_cache_release(page); 8040ca1f7ceSYan, Zheng ret = -EIO; 805940100a4SChris Mason goto err_reservations; 806f46b5a66SChristoph Hellwig } 807f46b5a66SChristoph Hellwig } 808f46b5a66SChristoph Hellwig 809940100a4SChris Mason if (page->mapping != inode->i_mapping) { 810940100a4SChris Mason unlock_page(page); 811940100a4SChris Mason page_cache_release(page); 812940100a4SChris Mason goto again; 813940100a4SChris Mason } 814940100a4SChris Mason 815f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 816f46b5a66SChristoph Hellwig 817940100a4SChris Mason if (PageDirty(page)) { 8180ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 819940100a4SChris Mason goto loop_unlock; 820940100a4SChris Mason } 821940100a4SChris Mason 822f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 823f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 824f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 8253eaa2885SChris Mason 8263eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 8273eaa2885SChris Mason if (ordered) { 8283eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 8293eaa2885SChris Mason unlock_page(page); 8303eaa2885SChris Mason page_cache_release(page); 8313eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 8323eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 8333eaa2885SChris Mason goto again; 8343eaa2885SChris Mason } 8353eaa2885SChris Mason set_page_extent_mapped(page); 8363eaa2885SChris Mason 837f87f057bSChris Mason /* 838f87f057bSChris Mason * this makes sure page_mkwrite is called on the 839f87f057bSChris Mason * page if it is dirtied again later 840f87f057bSChris Mason */ 841f87f057bSChris Mason clear_page_dirty_for_io(page); 842940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 843940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 844940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 845f87f057bSChris Mason 8462ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 847940100a4SChris Mason ClearPageChecked(page); 848f46b5a66SChristoph Hellwig set_page_dirty(page); 849a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 850940100a4SChris Mason 851940100a4SChris Mason loop_unlock: 852f46b5a66SChristoph Hellwig unlock_page(page); 853f46b5a66SChristoph Hellwig page_cache_release(page); 854940100a4SChris Mason mutex_unlock(&inode->i_mutex); 855940100a4SChris Mason 856f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 857940100a4SChris Mason i++; 858f46b5a66SChristoph Hellwig } 859f46b5a66SChristoph Hellwig 8601e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 8611e701a32SChris Mason filemap_flush(inode->i_mapping); 8621e701a32SChris Mason 8631e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 8641e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 8651e701a32SChris Mason * we have to make sure the IO is actually started and that 8661e701a32SChris Mason * ordered extents get created before we return 8671e701a32SChris Mason */ 8681e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 8691e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 8701e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 8711e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 8721e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 8731e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 8741e701a32SChris Mason } 8751e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 8761e701a32SChris Mason 8771e701a32SChris Mason mutex_lock(&inode->i_mutex); 878261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 8791e701a32SChris Mason mutex_unlock(&inode->i_mutex); 8801e701a32SChris Mason } 8811e701a32SChris Mason 8821a419d85SLi Zefan disk_super = &root->fs_info->super_copy; 8831a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 8841a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 8851a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 8861a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 8871a419d85SLi Zefan } 8881a419d85SLi Zefan 889f46b5a66SChristoph Hellwig return 0; 890940100a4SChris Mason 891940100a4SChris Mason err_reservations: 8920ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 8930ca1f7ceSYan, Zheng err_unlock: 894940100a4SChris Mason mutex_unlock(&inode->i_mutex); 895940100a4SChris Mason return ret; 896f46b5a66SChristoph Hellwig } 897f46b5a66SChristoph Hellwig 89876dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 89976dda93cSYan, Zheng void __user *arg) 900f46b5a66SChristoph Hellwig { 901f46b5a66SChristoph Hellwig u64 new_size; 902f46b5a66SChristoph Hellwig u64 old_size; 903f46b5a66SChristoph Hellwig u64 devid = 1; 904f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 905f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 906f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 907f46b5a66SChristoph Hellwig char *sizestr; 908f46b5a66SChristoph Hellwig char *devstr = NULL; 909f46b5a66SChristoph Hellwig int ret = 0; 910f46b5a66SChristoph Hellwig int mod = 0; 911f46b5a66SChristoph Hellwig 912c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 913c146afadSYan Zheng return -EROFS; 914c146afadSYan Zheng 915e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 916e441d54dSChris Mason return -EPERM; 917e441d54dSChris Mason 918dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 919dae7b665SLi Zefan if (IS_ERR(vol_args)) 920dae7b665SLi Zefan return PTR_ERR(vol_args); 9215516e595SMark Fasheh 9225516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 923f46b5a66SChristoph Hellwig 9247d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 925f46b5a66SChristoph Hellwig sizestr = vol_args->name; 926f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 927f46b5a66SChristoph Hellwig if (devstr) { 928f46b5a66SChristoph Hellwig char *end; 929f46b5a66SChristoph Hellwig sizestr = devstr + 1; 930f46b5a66SChristoph Hellwig *devstr = '\0'; 931f46b5a66SChristoph Hellwig devstr = vol_args->name; 932f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 93321380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 93421380931SJoel Becker (unsigned long long)devid); 935f46b5a66SChristoph Hellwig } 9362b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 937f46b5a66SChristoph Hellwig if (!device) { 93821380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 93921380931SJoel Becker (unsigned long long)devid); 940f46b5a66SChristoph Hellwig ret = -EINVAL; 941f46b5a66SChristoph Hellwig goto out_unlock; 942f46b5a66SChristoph Hellwig } 943f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 944f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 945f46b5a66SChristoph Hellwig else { 946f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 947f46b5a66SChristoph Hellwig mod = -1; 948f46b5a66SChristoph Hellwig sizestr++; 949f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 950f46b5a66SChristoph Hellwig mod = 1; 951f46b5a66SChristoph Hellwig sizestr++; 952f46b5a66SChristoph Hellwig } 95391748467SAkinobu Mita new_size = memparse(sizestr, NULL); 954f46b5a66SChristoph Hellwig if (new_size == 0) { 955f46b5a66SChristoph Hellwig ret = -EINVAL; 956f46b5a66SChristoph Hellwig goto out_unlock; 957f46b5a66SChristoph Hellwig } 958f46b5a66SChristoph Hellwig } 959f46b5a66SChristoph Hellwig 960f46b5a66SChristoph Hellwig old_size = device->total_bytes; 961f46b5a66SChristoph Hellwig 962f46b5a66SChristoph Hellwig if (mod < 0) { 963f46b5a66SChristoph Hellwig if (new_size > old_size) { 964f46b5a66SChristoph Hellwig ret = -EINVAL; 965f46b5a66SChristoph Hellwig goto out_unlock; 966f46b5a66SChristoph Hellwig } 967f46b5a66SChristoph Hellwig new_size = old_size - new_size; 968f46b5a66SChristoph Hellwig } else if (mod > 0) { 969f46b5a66SChristoph Hellwig new_size = old_size + new_size; 970f46b5a66SChristoph Hellwig } 971f46b5a66SChristoph Hellwig 972f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 973f46b5a66SChristoph Hellwig ret = -EINVAL; 974f46b5a66SChristoph Hellwig goto out_unlock; 975f46b5a66SChristoph Hellwig } 976f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 977f46b5a66SChristoph Hellwig ret = -EFBIG; 978f46b5a66SChristoph Hellwig goto out_unlock; 979f46b5a66SChristoph Hellwig } 980f46b5a66SChristoph Hellwig 981f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 982f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 983f46b5a66SChristoph Hellwig 984f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 985f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 986f46b5a66SChristoph Hellwig 987f46b5a66SChristoph Hellwig if (new_size > old_size) { 988a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 98998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 99098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 99198d5dc13STsutomu Itoh goto out_unlock; 99298d5dc13STsutomu Itoh } 993f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 994f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 995f46b5a66SChristoph Hellwig } else { 996f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 997f46b5a66SChristoph Hellwig } 998f46b5a66SChristoph Hellwig 999f46b5a66SChristoph Hellwig out_unlock: 10007d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 1001f46b5a66SChristoph Hellwig kfree(vol_args); 1002f46b5a66SChristoph Hellwig return ret; 1003f46b5a66SChristoph Hellwig } 1004f46b5a66SChristoph Hellwig 100572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 100672fd032eSSage Weil char *name, 100772fd032eSSage Weil unsigned long fd, 100872fd032eSSage Weil int subvol, 1009b83cc969SLi Zefan u64 *transid, 1010b83cc969SLi Zefan bool readonly) 1011f46b5a66SChristoph Hellwig { 1012cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 10133de4586cSChris Mason struct file *src_file; 1014f46b5a66SChristoph Hellwig int namelen; 10153de4586cSChris Mason int ret = 0; 1016f46b5a66SChristoph Hellwig 1017c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1018c146afadSYan Zheng return -EROFS; 1019c146afadSYan Zheng 102072fd032eSSage Weil namelen = strlen(name); 102172fd032eSSage Weil if (strchr(name, '/')) { 1022f46b5a66SChristoph Hellwig ret = -EINVAL; 1023f46b5a66SChristoph Hellwig goto out; 1024f46b5a66SChristoph Hellwig } 1025f46b5a66SChristoph Hellwig 10263de4586cSChris Mason if (subvol) { 102772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1028b83cc969SLi Zefan NULL, transid, readonly); 1029cb8e7090SChristoph Hellwig } else { 10303de4586cSChris Mason struct inode *src_inode; 103172fd032eSSage Weil src_file = fget(fd); 10323de4586cSChris Mason if (!src_file) { 10333de4586cSChris Mason ret = -EINVAL; 10343de4586cSChris Mason goto out; 10353de4586cSChris Mason } 10363de4586cSChris Mason 10373de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 10383de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1039d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1040d397712bSChris Mason "another FS\n"); 10413de4586cSChris Mason ret = -EINVAL; 10423de4586cSChris Mason fput(src_file); 10433de4586cSChris Mason goto out; 10443de4586cSChris Mason } 104572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 104672fd032eSSage Weil BTRFS_I(src_inode)->root, 1047b83cc969SLi Zefan transid, readonly); 10483de4586cSChris Mason fput(src_file); 1049cb8e7090SChristoph Hellwig } 1050f46b5a66SChristoph Hellwig out: 105172fd032eSSage Weil return ret; 105272fd032eSSage Weil } 105372fd032eSSage Weil 105472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1055fa0d2b9bSLi Zefan void __user *arg, int subvol) 105672fd032eSSage Weil { 1057fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 105872fd032eSSage Weil int ret; 105972fd032eSSage Weil 1060fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1061fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1062fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1063fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1064fa0d2b9bSLi Zefan 1065fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1066b83cc969SLi Zefan vol_args->fd, subvol, 1067b83cc969SLi Zefan NULL, false); 1068fa0d2b9bSLi Zefan 1069fa0d2b9bSLi Zefan kfree(vol_args); 1070fa0d2b9bSLi Zefan return ret; 1071fa0d2b9bSLi Zefan } 1072fa0d2b9bSLi Zefan 1073fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1074fa0d2b9bSLi Zefan void __user *arg, int subvol) 1075fa0d2b9bSLi Zefan { 1076fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1077fa0d2b9bSLi Zefan int ret; 1078fdfb1e4fSLi Zefan u64 transid = 0; 1079fdfb1e4fSLi Zefan u64 *ptr = NULL; 1080b83cc969SLi Zefan bool readonly = false; 108172fd032eSSage Weil 1082fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1083fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1084fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1085fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1086fdfb1e4fSLi Zefan 1087b83cc969SLi Zefan if (vol_args->flags & 1088b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1089b83cc969SLi Zefan ret = -EOPNOTSUPP; 1090fdfb1e4fSLi Zefan goto out; 1091fdfb1e4fSLi Zefan } 1092fdfb1e4fSLi Zefan 1093fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1094fdfb1e4fSLi Zefan ptr = &transid; 1095b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1096b83cc969SLi Zefan readonly = true; 109775eaa0e2SSage Weil 1098fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1099b83cc969SLi Zefan vol_args->fd, subvol, 1100b83cc969SLi Zefan ptr, readonly); 110175eaa0e2SSage Weil 1102fdfb1e4fSLi Zefan if (ret == 0 && ptr && 110375eaa0e2SSage Weil copy_to_user(arg + 1104fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1105fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 110675eaa0e2SSage Weil ret = -EFAULT; 1107fdfb1e4fSLi Zefan out: 1108f46b5a66SChristoph Hellwig kfree(vol_args); 1109f46b5a66SChristoph Hellwig return ret; 1110f46b5a66SChristoph Hellwig } 1111f46b5a66SChristoph Hellwig 11120caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 11130caa102dSLi Zefan void __user *arg) 11140caa102dSLi Zefan { 11150caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11160caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11170caa102dSLi Zefan int ret = 0; 11180caa102dSLi Zefan u64 flags = 0; 11190caa102dSLi Zefan 11200caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11210caa102dSLi Zefan return -EINVAL; 11220caa102dSLi Zefan 11230caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 11240caa102dSLi Zefan if (btrfs_root_readonly(root)) 11250caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 11260caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 11270caa102dSLi Zefan 11280caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 11290caa102dSLi Zefan ret = -EFAULT; 11300caa102dSLi Zefan 11310caa102dSLi Zefan return ret; 11320caa102dSLi Zefan } 11330caa102dSLi Zefan 11340caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 11350caa102dSLi Zefan void __user *arg) 11360caa102dSLi Zefan { 11370caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11380caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11390caa102dSLi Zefan struct btrfs_trans_handle *trans; 11400caa102dSLi Zefan u64 root_flags; 11410caa102dSLi Zefan u64 flags; 11420caa102dSLi Zefan int ret = 0; 11430caa102dSLi Zefan 11440caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 11450caa102dSLi Zefan return -EROFS; 11460caa102dSLi Zefan 11470caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11480caa102dSLi Zefan return -EINVAL; 11490caa102dSLi Zefan 11500caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 11510caa102dSLi Zefan return -EFAULT; 11520caa102dSLi Zefan 1153b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 11540caa102dSLi Zefan return -EINVAL; 11550caa102dSLi Zefan 11560caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 11570caa102dSLi Zefan return -EOPNOTSUPP; 11580caa102dSLi Zefan 1159b4dc2b8cSLi Zefan if (!is_owner_or_cap(inode)) 1160b4dc2b8cSLi Zefan return -EACCES; 1161b4dc2b8cSLi Zefan 11620caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 11630caa102dSLi Zefan 11640caa102dSLi Zefan /* nothing to do */ 11650caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 11660caa102dSLi Zefan goto out; 11670caa102dSLi Zefan 11680caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 11690caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 11700caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11710caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 11720caa102dSLi Zefan else 11730caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11740caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 11750caa102dSLi Zefan 11760caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 11770caa102dSLi Zefan if (IS_ERR(trans)) { 11780caa102dSLi Zefan ret = PTR_ERR(trans); 11790caa102dSLi Zefan goto out_reset; 11800caa102dSLi Zefan } 11810caa102dSLi Zefan 1182b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 11830caa102dSLi Zefan &root->root_key, &root->root_item); 11840caa102dSLi Zefan 11850caa102dSLi Zefan btrfs_commit_transaction(trans, root); 11860caa102dSLi Zefan out_reset: 11870caa102dSLi Zefan if (ret) 11880caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 11890caa102dSLi Zefan out: 11900caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 11910caa102dSLi Zefan return ret; 11920caa102dSLi Zefan } 11930caa102dSLi Zefan 119476dda93cSYan, Zheng /* 119576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 119676dda93cSYan, Zheng */ 119776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 119876dda93cSYan, Zheng { 119976dda93cSYan, Zheng struct btrfs_path *path; 120076dda93cSYan, Zheng struct btrfs_key key; 120176dda93cSYan, Zheng int ret; 120276dda93cSYan, Zheng 120376dda93cSYan, Zheng path = btrfs_alloc_path(); 120476dda93cSYan, Zheng if (!path) 120576dda93cSYan, Zheng return -ENOMEM; 120676dda93cSYan, Zheng 120776dda93cSYan, Zheng key.objectid = root->root_key.objectid; 120876dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 120976dda93cSYan, Zheng key.offset = (u64)-1; 121076dda93cSYan, Zheng 121176dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 121276dda93cSYan, Zheng &key, path, 0, 0); 121376dda93cSYan, Zheng if (ret < 0) 121476dda93cSYan, Zheng goto out; 121576dda93cSYan, Zheng BUG_ON(ret == 0); 121676dda93cSYan, Zheng 121776dda93cSYan, Zheng ret = 0; 121876dda93cSYan, Zheng if (path->slots[0] > 0) { 121976dda93cSYan, Zheng path->slots[0]--; 122076dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 122176dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 122276dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 122376dda93cSYan, Zheng ret = -ENOTEMPTY; 122476dda93cSYan, Zheng } 122576dda93cSYan, Zheng out: 122676dda93cSYan, Zheng btrfs_free_path(path); 122776dda93cSYan, Zheng return ret; 122876dda93cSYan, Zheng } 122976dda93cSYan, Zheng 1230ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1231ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1232ac8e9819SChris Mason { 1233abc6e134SChris Mason struct btrfs_key test; 1234abc6e134SChris Mason int ret; 1235abc6e134SChris Mason 1236abc6e134SChris Mason test.objectid = sk->min_objectid; 1237abc6e134SChris Mason test.type = sk->min_type; 1238abc6e134SChris Mason test.offset = sk->min_offset; 1239abc6e134SChris Mason 1240abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1241abc6e134SChris Mason if (ret < 0) 1242ac8e9819SChris Mason return 0; 1243abc6e134SChris Mason 1244abc6e134SChris Mason test.objectid = sk->max_objectid; 1245abc6e134SChris Mason test.type = sk->max_type; 1246abc6e134SChris Mason test.offset = sk->max_offset; 1247abc6e134SChris Mason 1248abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1249abc6e134SChris Mason if (ret > 0) 1250ac8e9819SChris Mason return 0; 1251ac8e9819SChris Mason return 1; 1252ac8e9819SChris Mason } 1253ac8e9819SChris Mason 1254ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1255ac8e9819SChris Mason struct btrfs_path *path, 1256ac8e9819SChris Mason struct btrfs_key *key, 1257ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1258ac8e9819SChris Mason char *buf, 1259ac8e9819SChris Mason unsigned long *sk_offset, 1260ac8e9819SChris Mason int *num_found) 1261ac8e9819SChris Mason { 1262ac8e9819SChris Mason u64 found_transid; 1263ac8e9819SChris Mason struct extent_buffer *leaf; 1264ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1265ac8e9819SChris Mason unsigned long item_off; 1266ac8e9819SChris Mason unsigned long item_len; 1267ac8e9819SChris Mason int nritems; 1268ac8e9819SChris Mason int i; 1269ac8e9819SChris Mason int slot; 1270ac8e9819SChris Mason int found = 0; 1271ac8e9819SChris Mason int ret = 0; 1272ac8e9819SChris Mason 1273ac8e9819SChris Mason leaf = path->nodes[0]; 1274ac8e9819SChris Mason slot = path->slots[0]; 1275ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1276ac8e9819SChris Mason 1277ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1278ac8e9819SChris Mason i = nritems; 1279ac8e9819SChris Mason goto advance_key; 1280ac8e9819SChris Mason } 1281ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1282ac8e9819SChris Mason 1283ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1284ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1285ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1286ac8e9819SChris Mason 1287ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1288ac8e9819SChris Mason item_len = 0; 1289ac8e9819SChris Mason 1290ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1291ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1292ac8e9819SChris Mason ret = 1; 1293ac8e9819SChris Mason goto overflow; 1294ac8e9819SChris Mason } 1295ac8e9819SChris Mason 1296ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1297ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1298ac8e9819SChris Mason continue; 1299ac8e9819SChris Mason 1300ac8e9819SChris Mason sh.objectid = key->objectid; 1301ac8e9819SChris Mason sh.offset = key->offset; 1302ac8e9819SChris Mason sh.type = key->type; 1303ac8e9819SChris Mason sh.len = item_len; 1304ac8e9819SChris Mason sh.transid = found_transid; 1305ac8e9819SChris Mason 1306ac8e9819SChris Mason /* copy search result header */ 1307ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1308ac8e9819SChris Mason *sk_offset += sizeof(sh); 1309ac8e9819SChris Mason 1310ac8e9819SChris Mason if (item_len) { 1311ac8e9819SChris Mason char *p = buf + *sk_offset; 1312ac8e9819SChris Mason /* copy the item */ 1313ac8e9819SChris Mason read_extent_buffer(leaf, p, 1314ac8e9819SChris Mason item_off, item_len); 1315ac8e9819SChris Mason *sk_offset += item_len; 1316ac8e9819SChris Mason } 131790fdde14SChris Mason found++; 1318ac8e9819SChris Mason 1319ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1320ac8e9819SChris Mason break; 1321ac8e9819SChris Mason } 1322ac8e9819SChris Mason advance_key: 1323ac8e9819SChris Mason ret = 0; 1324abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1325abc6e134SChris Mason key->offset++; 1326abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1327abc6e134SChris Mason key->offset = 0; 1328abc6e134SChris Mason key->type++; 1329abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1330abc6e134SChris Mason key->offset = 0; 1331abc6e134SChris Mason key->type = 0; 1332abc6e134SChris Mason key->objectid++; 1333abc6e134SChris Mason } else 1334abc6e134SChris Mason ret = 1; 1335ac8e9819SChris Mason overflow: 1336ac8e9819SChris Mason *num_found += found; 1337ac8e9819SChris Mason return ret; 1338ac8e9819SChris Mason } 1339ac8e9819SChris Mason 1340ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1341ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1342ac8e9819SChris Mason { 1343ac8e9819SChris Mason struct btrfs_root *root; 1344ac8e9819SChris Mason struct btrfs_key key; 1345ac8e9819SChris Mason struct btrfs_key max_key; 1346ac8e9819SChris Mason struct btrfs_path *path; 1347ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1348ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1349ac8e9819SChris Mason int ret; 1350ac8e9819SChris Mason int num_found = 0; 1351ac8e9819SChris Mason unsigned long sk_offset = 0; 1352ac8e9819SChris Mason 1353ac8e9819SChris Mason path = btrfs_alloc_path(); 1354ac8e9819SChris Mason if (!path) 1355ac8e9819SChris Mason return -ENOMEM; 1356ac8e9819SChris Mason 1357ac8e9819SChris Mason if (sk->tree_id == 0) { 1358ac8e9819SChris Mason /* search the root of the inode that was passed */ 1359ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1360ac8e9819SChris Mason } else { 1361ac8e9819SChris Mason key.objectid = sk->tree_id; 1362ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1363ac8e9819SChris Mason key.offset = (u64)-1; 1364ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1365ac8e9819SChris Mason if (IS_ERR(root)) { 1366ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1367ac8e9819SChris Mason sk->tree_id); 1368ac8e9819SChris Mason btrfs_free_path(path); 1369ac8e9819SChris Mason return -ENOENT; 1370ac8e9819SChris Mason } 1371ac8e9819SChris Mason } 1372ac8e9819SChris Mason 1373ac8e9819SChris Mason key.objectid = sk->min_objectid; 1374ac8e9819SChris Mason key.type = sk->min_type; 1375ac8e9819SChris Mason key.offset = sk->min_offset; 1376ac8e9819SChris Mason 1377ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1378ac8e9819SChris Mason max_key.type = sk->max_type; 1379ac8e9819SChris Mason max_key.offset = sk->max_offset; 1380ac8e9819SChris Mason 1381ac8e9819SChris Mason path->keep_locks = 1; 1382ac8e9819SChris Mason 1383ac8e9819SChris Mason while(1) { 1384ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1385ac8e9819SChris Mason sk->min_transid); 1386ac8e9819SChris Mason if (ret != 0) { 1387ac8e9819SChris Mason if (ret > 0) 1388ac8e9819SChris Mason ret = 0; 1389ac8e9819SChris Mason goto err; 1390ac8e9819SChris Mason } 1391ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1392ac8e9819SChris Mason &sk_offset, &num_found); 1393ac8e9819SChris Mason btrfs_release_path(root, path); 1394ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1395ac8e9819SChris Mason break; 1396ac8e9819SChris Mason 1397ac8e9819SChris Mason } 1398ac8e9819SChris Mason ret = 0; 1399ac8e9819SChris Mason err: 1400ac8e9819SChris Mason sk->nr_items = num_found; 1401ac8e9819SChris Mason btrfs_free_path(path); 1402ac8e9819SChris Mason return ret; 1403ac8e9819SChris Mason } 1404ac8e9819SChris Mason 1405ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1406ac8e9819SChris Mason void __user *argp) 1407ac8e9819SChris Mason { 1408ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1409ac8e9819SChris Mason struct inode *inode; 1410ac8e9819SChris Mason int ret; 1411ac8e9819SChris Mason 1412ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1413ac8e9819SChris Mason return -EPERM; 1414ac8e9819SChris Mason 14152354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 14162354d08fSJulia Lawall if (IS_ERR(args)) 14172354d08fSJulia Lawall return PTR_ERR(args); 1418ac8e9819SChris Mason 1419ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1420ac8e9819SChris Mason ret = search_ioctl(inode, args); 1421ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1422ac8e9819SChris Mason ret = -EFAULT; 1423ac8e9819SChris Mason kfree(args); 1424ac8e9819SChris Mason return ret; 1425ac8e9819SChris Mason } 1426ac8e9819SChris Mason 142798d377a0STARUISI Hiroaki /* 1428ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1429ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 143098d377a0STARUISI Hiroaki */ 143198d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 143298d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 143398d377a0STARUISI Hiroaki { 143498d377a0STARUISI Hiroaki struct btrfs_root *root; 143598d377a0STARUISI Hiroaki struct btrfs_key key; 1436ac8e9819SChris Mason char *ptr; 143798d377a0STARUISI Hiroaki int ret = -1; 143898d377a0STARUISI Hiroaki int slot; 143998d377a0STARUISI Hiroaki int len; 144098d377a0STARUISI Hiroaki int total_len = 0; 144198d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 144298d377a0STARUISI Hiroaki struct extent_buffer *l; 144398d377a0STARUISI Hiroaki struct btrfs_path *path; 144498d377a0STARUISI Hiroaki 144598d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 144698d377a0STARUISI Hiroaki name[0]='\0'; 144798d377a0STARUISI Hiroaki return 0; 144898d377a0STARUISI Hiroaki } 144998d377a0STARUISI Hiroaki 145098d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 145198d377a0STARUISI Hiroaki if (!path) 145298d377a0STARUISI Hiroaki return -ENOMEM; 145398d377a0STARUISI Hiroaki 1454ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 145598d377a0STARUISI Hiroaki 145698d377a0STARUISI Hiroaki key.objectid = tree_id; 145798d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 145898d377a0STARUISI Hiroaki key.offset = (u64)-1; 145998d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 146098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 146198d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 14628ad6fcabSChris Mason ret = -ENOENT; 14638ad6fcabSChris Mason goto out; 146498d377a0STARUISI Hiroaki } 146598d377a0STARUISI Hiroaki 146698d377a0STARUISI Hiroaki key.objectid = dirid; 146798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 14688ad6fcabSChris Mason key.offset = (u64)-1; 146998d377a0STARUISI Hiroaki 147098d377a0STARUISI Hiroaki while(1) { 147198d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 147298d377a0STARUISI Hiroaki if (ret < 0) 147398d377a0STARUISI Hiroaki goto out; 147498d377a0STARUISI Hiroaki 147598d377a0STARUISI Hiroaki l = path->nodes[0]; 147698d377a0STARUISI Hiroaki slot = path->slots[0]; 14778ad6fcabSChris Mason if (ret > 0 && slot > 0) 14788ad6fcabSChris Mason slot--; 147998d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 148098d377a0STARUISI Hiroaki 148198d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1482ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1483ac8e9819SChris Mason ret = -ENOENT; 148498d377a0STARUISI Hiroaki goto out; 1485ac8e9819SChris Mason } 148698d377a0STARUISI Hiroaki 148798d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 148898d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 148998d377a0STARUISI Hiroaki ptr -= len + 1; 149098d377a0STARUISI Hiroaki total_len += len + 1; 1491ac8e9819SChris Mason if (ptr < name) 149298d377a0STARUISI Hiroaki goto out; 149398d377a0STARUISI Hiroaki 149498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 149598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 149698d377a0STARUISI Hiroaki 149798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 149898d377a0STARUISI Hiroaki break; 149998d377a0STARUISI Hiroaki 150098d377a0STARUISI Hiroaki btrfs_release_path(root, path); 150198d377a0STARUISI Hiroaki key.objectid = key.offset; 15028ad6fcabSChris Mason key.offset = (u64)-1; 150398d377a0STARUISI Hiroaki dirid = key.objectid; 150498d377a0STARUISI Hiroaki 150598d377a0STARUISI Hiroaki } 1506ac8e9819SChris Mason if (ptr < name) 150798d377a0STARUISI Hiroaki goto out; 1508ac8e9819SChris Mason memcpy(name, ptr, total_len); 150998d377a0STARUISI Hiroaki name[total_len]='\0'; 151098d377a0STARUISI Hiroaki ret = 0; 151198d377a0STARUISI Hiroaki out: 151298d377a0STARUISI Hiroaki btrfs_free_path(path); 1513ac8e9819SChris Mason return ret; 1514ac8e9819SChris Mason } 1515ac8e9819SChris Mason 1516ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1517ac8e9819SChris Mason void __user *argp) 1518ac8e9819SChris Mason { 1519ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1520ac8e9819SChris Mason struct inode *inode; 1521ac8e9819SChris Mason int ret; 1522ac8e9819SChris Mason 1523ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1524ac8e9819SChris Mason return -EPERM; 1525ac8e9819SChris Mason 15262354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 15272354d08fSJulia Lawall if (IS_ERR(args)) 15282354d08fSJulia Lawall return PTR_ERR(args); 1529c2b96929SDan Carpenter 1530ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1531ac8e9819SChris Mason 15321b53ac4dSChris Mason if (args->treeid == 0) 15331b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 15341b53ac4dSChris Mason 1535ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1536ac8e9819SChris Mason args->treeid, args->objectid, 1537ac8e9819SChris Mason args->name); 1538ac8e9819SChris Mason 1539ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1540ac8e9819SChris Mason ret = -EFAULT; 1541ac8e9819SChris Mason 1542ac8e9819SChris Mason kfree(args); 154398d377a0STARUISI Hiroaki return ret; 154498d377a0STARUISI Hiroaki } 154598d377a0STARUISI Hiroaki 154676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 154776dda93cSYan, Zheng void __user *arg) 154876dda93cSYan, Zheng { 154976dda93cSYan, Zheng struct dentry *parent = fdentry(file); 155076dda93cSYan, Zheng struct dentry *dentry; 155176dda93cSYan, Zheng struct inode *dir = parent->d_inode; 155276dda93cSYan, Zheng struct inode *inode; 155376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 155476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 155576dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 155676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 155776dda93cSYan, Zheng int namelen; 155876dda93cSYan, Zheng int ret; 155976dda93cSYan, Zheng int err = 0; 156076dda93cSYan, Zheng 156176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 156276dda93cSYan, Zheng if (IS_ERR(vol_args)) 156376dda93cSYan, Zheng return PTR_ERR(vol_args); 156476dda93cSYan, Zheng 156576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 156676dda93cSYan, Zheng namelen = strlen(vol_args->name); 156776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 156876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 156976dda93cSYan, Zheng err = -EINVAL; 157076dda93cSYan, Zheng goto out; 157176dda93cSYan, Zheng } 157276dda93cSYan, Zheng 157376dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 157476dda93cSYan, Zheng if (err) 157576dda93cSYan, Zheng goto out; 157676dda93cSYan, Zheng 157776dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 157876dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 157976dda93cSYan, Zheng if (IS_ERR(dentry)) { 158076dda93cSYan, Zheng err = PTR_ERR(dentry); 158176dda93cSYan, Zheng goto out_unlock_dir; 158276dda93cSYan, Zheng } 158376dda93cSYan, Zheng 158476dda93cSYan, Zheng if (!dentry->d_inode) { 158576dda93cSYan, Zheng err = -ENOENT; 158676dda93cSYan, Zheng goto out_dput; 158776dda93cSYan, Zheng } 158876dda93cSYan, Zheng 158976dda93cSYan, Zheng inode = dentry->d_inode; 15904260f7c7SSage Weil dest = BTRFS_I(inode)->root; 15914260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 15924260f7c7SSage Weil /* 15934260f7c7SSage Weil * Regular user. Only allow this with a special mount 15944260f7c7SSage Weil * option, when the user has write+exec access to the 15954260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 15964260f7c7SSage Weil * allowed. 15974260f7c7SSage Weil * 15984260f7c7SSage Weil * Note that this is _not_ check that the subvol is 15994260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 16004260f7c7SSage Weil * otherwise be able to delete. 16014260f7c7SSage Weil * 16024260f7c7SSage Weil * Users who want to delete empty subvols should try 16034260f7c7SSage Weil * rmdir(2). 16044260f7c7SSage Weil */ 16054260f7c7SSage Weil err = -EPERM; 16064260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 16074260f7c7SSage Weil goto out_dput; 16084260f7c7SSage Weil 16094260f7c7SSage Weil /* 16104260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 16114260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 16124260f7c7SSage Weil * must be called on the dentry referencing the root 16134260f7c7SSage Weil * of the subvol, not a random directory contained 16144260f7c7SSage Weil * within it. 16154260f7c7SSage Weil */ 16164260f7c7SSage Weil err = -EINVAL; 16174260f7c7SSage Weil if (root == dest) 16184260f7c7SSage Weil goto out_dput; 16194260f7c7SSage Weil 16204260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 16214260f7c7SSage Weil if (err) 16224260f7c7SSage Weil goto out_dput; 16234260f7c7SSage Weil 16244260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 16254260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 16264260f7c7SSage Weil if (err) 16274260f7c7SSage Weil goto out_dput; 16284260f7c7SSage Weil } 16294260f7c7SSage Weil 163076dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 163176dda93cSYan, Zheng err = -EINVAL; 163276dda93cSYan, Zheng goto out_dput; 163376dda93cSYan, Zheng } 163476dda93cSYan, Zheng 163576dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 163676dda93cSYan, Zheng err = d_invalidate(dentry); 163776dda93cSYan, Zheng if (err) 163876dda93cSYan, Zheng goto out_unlock; 163976dda93cSYan, Zheng 164076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 164176dda93cSYan, Zheng 164276dda93cSYan, Zheng err = may_destroy_subvol(dest); 164376dda93cSYan, Zheng if (err) 164476dda93cSYan, Zheng goto out_up_write; 164576dda93cSYan, Zheng 1646a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1647a22285a6SYan, Zheng if (IS_ERR(trans)) { 1648a22285a6SYan, Zheng err = PTR_ERR(trans); 1649d327099aSDan Carpenter goto out_up_write; 1650a22285a6SYan, Zheng } 1651a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1652a22285a6SYan, Zheng 165376dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 165476dda93cSYan, Zheng dest->root_key.objectid, 165576dda93cSYan, Zheng dentry->d_name.name, 165676dda93cSYan, Zheng dentry->d_name.len); 165776dda93cSYan, Zheng BUG_ON(ret); 165876dda93cSYan, Zheng 165976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 166076dda93cSYan, Zheng 166176dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 166276dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 166376dda93cSYan, Zheng dest->root_item.drop_level = 0; 166476dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 166576dda93cSYan, Zheng 1666d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 166776dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 166876dda93cSYan, Zheng root->fs_info->tree_root, 166976dda93cSYan, Zheng dest->root_key.objectid); 167076dda93cSYan, Zheng BUG_ON(ret); 1671d68fc57bSYan, Zheng } 167276dda93cSYan, Zheng 1673531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 167476dda93cSYan, Zheng BUG_ON(ret); 167576dda93cSYan, Zheng inode->i_flags |= S_DEAD; 167676dda93cSYan, Zheng out_up_write: 167776dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 167876dda93cSYan, Zheng out_unlock: 167976dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 168076dda93cSYan, Zheng if (!err) { 1681efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 168276dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 168376dda93cSYan, Zheng d_delete(dentry); 168476dda93cSYan, Zheng } 168576dda93cSYan, Zheng out_dput: 168676dda93cSYan, Zheng dput(dentry); 168776dda93cSYan, Zheng out_unlock_dir: 168876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 168976dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 169076dda93cSYan, Zheng out: 169176dda93cSYan, Zheng kfree(vol_args); 169276dda93cSYan, Zheng return err; 169376dda93cSYan, Zheng } 169476dda93cSYan, Zheng 16951e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1696f46b5a66SChristoph Hellwig { 1697f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1698f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 16991e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1700c146afadSYan Zheng int ret; 1701c146afadSYan Zheng 1702b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1703b83cc969SLi Zefan return -EROFS; 1704b83cc969SLi Zefan 1705c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1706c146afadSYan Zheng if (ret) 1707c146afadSYan Zheng return ret; 1708f46b5a66SChristoph Hellwig 1709f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1710f46b5a66SChristoph Hellwig case S_IFDIR: 1711e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1712e441d54dSChris Mason ret = -EPERM; 1713e441d54dSChris Mason goto out; 1714e441d54dSChris Mason } 17158929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 17168929ecfaSYan, Zheng if (ret) 17178929ecfaSYan, Zheng goto out; 17188929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1719f46b5a66SChristoph Hellwig break; 1720f46b5a66SChristoph Hellwig case S_IFREG: 1721e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1722e441d54dSChris Mason ret = -EINVAL; 1723e441d54dSChris Mason goto out; 1724e441d54dSChris Mason } 17251e701a32SChris Mason 17261e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 17271e701a32SChris Mason if (!range) { 17281e701a32SChris Mason ret = -ENOMEM; 17291e701a32SChris Mason goto out; 17301e701a32SChris Mason } 17311e701a32SChris Mason 17321e701a32SChris Mason if (argp) { 17331e701a32SChris Mason if (copy_from_user(range, argp, 17341e701a32SChris Mason sizeof(*range))) { 17351e701a32SChris Mason ret = -EFAULT; 17361e701a32SChris Mason kfree(range); 1737683be16eSDan Carpenter goto out; 17381e701a32SChris Mason } 17391e701a32SChris Mason /* compression requires us to start the IO */ 17401e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 17411e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 17421e701a32SChris Mason range->extent_thresh = (u32)-1; 17431e701a32SChris Mason } 17441e701a32SChris Mason } else { 17451e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 17461e701a32SChris Mason range->len = (u64)-1; 17471e701a32SChris Mason } 17488929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 17491e701a32SChris Mason kfree(range); 1750f46b5a66SChristoph Hellwig break; 17518929ecfaSYan, Zheng default: 17528929ecfaSYan, Zheng ret = -EINVAL; 1753f46b5a66SChristoph Hellwig } 1754e441d54dSChris Mason out: 1755ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1756e441d54dSChris Mason return ret; 1757f46b5a66SChristoph Hellwig } 1758f46b5a66SChristoph Hellwig 1759b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1760f46b5a66SChristoph Hellwig { 1761f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1762f46b5a66SChristoph Hellwig int ret; 1763f46b5a66SChristoph Hellwig 1764e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1765e441d54dSChris Mason return -EPERM; 1766e441d54dSChris Mason 1767dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1768dae7b665SLi Zefan if (IS_ERR(vol_args)) 1769dae7b665SLi Zefan return PTR_ERR(vol_args); 1770f46b5a66SChristoph Hellwig 17715516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1772f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1773f46b5a66SChristoph Hellwig 1774f46b5a66SChristoph Hellwig kfree(vol_args); 1775f46b5a66SChristoph Hellwig return ret; 1776f46b5a66SChristoph Hellwig } 1777f46b5a66SChristoph Hellwig 1778b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1779f46b5a66SChristoph Hellwig { 1780f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1781f46b5a66SChristoph Hellwig int ret; 1782f46b5a66SChristoph Hellwig 1783e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1784e441d54dSChris Mason return -EPERM; 1785e441d54dSChris Mason 1786c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1787c146afadSYan Zheng return -EROFS; 1788c146afadSYan Zheng 1789dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1790dae7b665SLi Zefan if (IS_ERR(vol_args)) 1791dae7b665SLi Zefan return PTR_ERR(vol_args); 1792f46b5a66SChristoph Hellwig 17935516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1794f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1795f46b5a66SChristoph Hellwig 1796f46b5a66SChristoph Hellwig kfree(vol_args); 1797f46b5a66SChristoph Hellwig return ret; 1798f46b5a66SChristoph Hellwig } 1799f46b5a66SChristoph Hellwig 180076dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1801b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1802f46b5a66SChristoph Hellwig { 1803f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1804f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1805f46b5a66SChristoph Hellwig struct file *src_file; 1806f46b5a66SChristoph Hellwig struct inode *src; 1807f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1808f46b5a66SChristoph Hellwig struct btrfs_path *path; 1809f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1810ae01a0abSYan Zheng char *buf; 1811ae01a0abSYan Zheng struct btrfs_key key; 1812f46b5a66SChristoph Hellwig u32 nritems; 1813f46b5a66SChristoph Hellwig int slot; 1814ae01a0abSYan Zheng int ret; 1815c5c9cd4dSSage Weil u64 len = olen; 1816c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1817c5c9cd4dSSage Weil u64 hint_byte; 1818d20f7043SChris Mason 1819c5c9cd4dSSage Weil /* 1820c5c9cd4dSSage Weil * TODO: 1821c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1822c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1823c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1824c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1825c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1826c5c9cd4dSSage Weil * they don't overlap)? 1827c5c9cd4dSSage Weil */ 1828c5c9cd4dSSage Weil 1829e441d54dSChris Mason /* the destination must be opened for writing */ 18302ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1831e441d54dSChris Mason return -EINVAL; 1832e441d54dSChris Mason 1833b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1834b83cc969SLi Zefan return -EROFS; 1835b83cc969SLi Zefan 1836c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1837c146afadSYan Zheng if (ret) 1838c146afadSYan Zheng return ret; 1839c146afadSYan Zheng 1840c5c9cd4dSSage Weil src_file = fget(srcfd); 1841ab67b7c1SYan Zheng if (!src_file) { 1842ab67b7c1SYan Zheng ret = -EBADF; 1843ab67b7c1SYan Zheng goto out_drop_write; 1844ab67b7c1SYan Zheng } 18455dc64164SDan Rosenberg 1846f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1847f46b5a66SChristoph Hellwig 1848c5c9cd4dSSage Weil ret = -EINVAL; 1849c5c9cd4dSSage Weil if (src == inode) 1850c5c9cd4dSSage Weil goto out_fput; 1851c5c9cd4dSSage Weil 18525dc64164SDan Rosenberg /* the src must be open for reading */ 18535dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 18545dc64164SDan Rosenberg goto out_fput; 18555dc64164SDan Rosenberg 1856ae01a0abSYan Zheng ret = -EISDIR; 1857ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1858f46b5a66SChristoph Hellwig goto out_fput; 1859f46b5a66SChristoph Hellwig 1860ae01a0abSYan Zheng ret = -EXDEV; 1861ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1862ae01a0abSYan Zheng goto out_fput; 1863ae01a0abSYan Zheng 1864ae01a0abSYan Zheng ret = -ENOMEM; 1865ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1866ae01a0abSYan Zheng if (!buf) 1867ae01a0abSYan Zheng goto out_fput; 1868ae01a0abSYan Zheng 1869ae01a0abSYan Zheng path = btrfs_alloc_path(); 1870ae01a0abSYan Zheng if (!path) { 1871ae01a0abSYan Zheng vfree(buf); 1872ae01a0abSYan Zheng goto out_fput; 1873ae01a0abSYan Zheng } 1874ae01a0abSYan Zheng path->reada = 2; 1875ae01a0abSYan Zheng 1876f46b5a66SChristoph Hellwig if (inode < src) { 1877fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1878fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1879f46b5a66SChristoph Hellwig } else { 1880fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1881fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1882f46b5a66SChristoph Hellwig } 1883f46b5a66SChristoph Hellwig 1884c5c9cd4dSSage Weil /* determine range to clone */ 1885c5c9cd4dSSage Weil ret = -EINVAL; 18862ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1887f46b5a66SChristoph Hellwig goto out_unlock; 1888c5c9cd4dSSage Weil if (len == 0) 1889c5c9cd4dSSage Weil olen = len = src->i_size - off; 1890c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1891c5c9cd4dSSage Weil if (off + len == src->i_size) 18922a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1893c5c9cd4dSSage Weil 1894c5c9cd4dSSage Weil /* verify the end result is block aligned */ 18952a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 18962a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1897c5c9cd4dSSage Weil goto out_unlock; 1898c5c9cd4dSSage Weil 1899f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1900f46b5a66SChristoph Hellwig another, and lock file content */ 1901f46b5a66SChristoph Hellwig while (1) { 190231840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1903c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 19049a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 19059a019196SSage Weil if (!ordered && 19069a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 19079a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1908f46b5a66SChristoph Hellwig break; 1909c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1910ae01a0abSYan Zheng if (ordered) 1911ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 19129a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1913f46b5a66SChristoph Hellwig } 1914f46b5a66SChristoph Hellwig 1915c5c9cd4dSSage Weil /* clone data */ 1916f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1917ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1918ae01a0abSYan Zheng key.offset = 0; 1919f46b5a66SChristoph Hellwig 1920f46b5a66SChristoph Hellwig while (1) { 1921f46b5a66SChristoph Hellwig /* 1922f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1923f46b5a66SChristoph Hellwig * tree. 1924f46b5a66SChristoph Hellwig */ 1925a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1926f46b5a66SChristoph Hellwig if (ret < 0) 1927f46b5a66SChristoph Hellwig goto out; 1928f46b5a66SChristoph Hellwig 1929ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1930ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1931f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1932f46b5a66SChristoph Hellwig if (ret < 0) 1933f46b5a66SChristoph Hellwig goto out; 1934f46b5a66SChristoph Hellwig if (ret > 0) 1935f46b5a66SChristoph Hellwig break; 1936ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1937f46b5a66SChristoph Hellwig } 1938f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1939f46b5a66SChristoph Hellwig slot = path->slots[0]; 1940f46b5a66SChristoph Hellwig 1941ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1942d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1943f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1944f46b5a66SChristoph Hellwig break; 1945f46b5a66SChristoph Hellwig 1946c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1947c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1948c5c9cd4dSSage Weil int type; 194931840ae1SZheng Yan u32 size; 195031840ae1SZheng Yan struct btrfs_key new_key; 1951c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1952c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1953c5c9cd4dSSage Weil u8 comp; 1954b5384d48SSage Weil u64 endoff; 195531840ae1SZheng Yan 195631840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 195731840ae1SZheng Yan read_extent_buffer(leaf, buf, 195831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 195931840ae1SZheng Yan size); 1960c5c9cd4dSSage Weil 1961c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1962c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1963c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1964c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1965c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1966c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1967d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1968d397712bSChris Mason extent); 1969d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1970d397712bSChris Mason extent); 1971c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1972d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1973d397712bSChris Mason extent); 1974c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1975c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1976c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1977c5c9cd4dSSage Weil extent); 1978c5c9cd4dSSage Weil } 197931840ae1SZheng Yan btrfs_release_path(root, path); 198031840ae1SZheng Yan 1981050006a7SSage Weil if (key.offset + datal <= off || 1982c5c9cd4dSSage Weil key.offset >= off+len) 1983c5c9cd4dSSage Weil goto next; 1984c5c9cd4dSSage Weil 198531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 198631840ae1SZheng Yan new_key.objectid = inode->i_ino; 19874d728ec7SLi Zefan if (off <= key.offset) 1988c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 19894d728ec7SLi Zefan else 19904d728ec7SLi Zefan new_key.offset = destoff; 1991c5c9cd4dSSage Weil 1992a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1993a22285a6SYan, Zheng if (IS_ERR(trans)) { 1994a22285a6SYan, Zheng ret = PTR_ERR(trans); 1995a22285a6SYan, Zheng goto out; 1996a22285a6SYan, Zheng } 1997a22285a6SYan, Zheng 1998c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1999c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2000a22285a6SYan, Zheng if (off > key.offset) { 2001a22285a6SYan, Zheng datao += off - key.offset; 2002a22285a6SYan, Zheng datal -= off - key.offset; 2003a22285a6SYan, Zheng } 2004a22285a6SYan, Zheng 2005a22285a6SYan, Zheng if (key.offset + datal > off + len) 2006a22285a6SYan, Zheng datal = off + len - key.offset; 2007a22285a6SYan, Zheng 2008a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2009a22285a6SYan, Zheng new_key.offset, 2010a22285a6SYan, Zheng new_key.offset + datal, 2011a22285a6SYan, Zheng &hint_byte, 1); 2012a22285a6SYan, Zheng BUG_ON(ret); 2013a22285a6SYan, Zheng 201431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 201531840ae1SZheng Yan &new_key, size); 2016a22285a6SYan, Zheng BUG_ON(ret); 201731840ae1SZheng Yan 201831840ae1SZheng Yan leaf = path->nodes[0]; 201931840ae1SZheng Yan slot = path->slots[0]; 202031840ae1SZheng Yan write_extent_buffer(leaf, buf, 202131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 202231840ae1SZheng Yan size); 2023ae01a0abSYan Zheng 2024f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2025f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2026c5c9cd4dSSage Weil 2027c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2028c5c9cd4dSSage Weil if (!disko) 2029c5c9cd4dSSage Weil datao = 0; 2030c5c9cd4dSSage Weil 2031c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2032c5c9cd4dSSage Weil datao); 2033c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2034c5c9cd4dSSage Weil datal); 2035c5c9cd4dSSage Weil if (disko) { 2036c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2037ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 20385d4f98a2SYan Zheng disko, diskl, 0, 2039f46b5a66SChristoph Hellwig root->root_key.objectid, 20405d4f98a2SYan Zheng inode->i_ino, 20415d4f98a2SYan Zheng new_key.offset - datao); 2042ae01a0abSYan Zheng BUG_ON(ret); 2043f46b5a66SChristoph Hellwig } 2044c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2045c5c9cd4dSSage Weil u64 skip = 0; 2046c5c9cd4dSSage Weil u64 trim = 0; 2047c5c9cd4dSSage Weil if (off > key.offset) { 2048c5c9cd4dSSage Weil skip = off - key.offset; 2049c5c9cd4dSSage Weil new_key.offset += skip; 205031840ae1SZheng Yan } 2051d397712bSChris Mason 2052c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2053c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2054d397712bSChris Mason 2055c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2056c5c9cd4dSSage Weil ret = -EINVAL; 2057a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2058c5c9cd4dSSage Weil goto out; 205931840ae1SZheng Yan } 2060c5c9cd4dSSage Weil size -= skip + trim; 2061c5c9cd4dSSage Weil datal -= skip + trim; 2062a22285a6SYan, Zheng 2063a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2064a22285a6SYan, Zheng new_key.offset, 2065a22285a6SYan, Zheng new_key.offset + datal, 2066a22285a6SYan, Zheng &hint_byte, 1); 2067a22285a6SYan, Zheng BUG_ON(ret); 2068a22285a6SYan, Zheng 2069c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2070c5c9cd4dSSage Weil &new_key, size); 2071a22285a6SYan, Zheng BUG_ON(ret); 2072c5c9cd4dSSage Weil 2073c5c9cd4dSSage Weil if (skip) { 2074d397712bSChris Mason u32 start = 2075d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2076c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2077c5c9cd4dSSage Weil datal); 2078c5c9cd4dSSage Weil } 2079c5c9cd4dSSage Weil 2080c5c9cd4dSSage Weil leaf = path->nodes[0]; 2081c5c9cd4dSSage Weil slot = path->slots[0]; 2082c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2083c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2084c5c9cd4dSSage Weil size); 2085c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2086c5c9cd4dSSage Weil } 2087c5c9cd4dSSage Weil 2088c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2089a22285a6SYan, Zheng btrfs_release_path(root, path); 2090c5c9cd4dSSage Weil 2091a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2092b5384d48SSage Weil 2093b5384d48SSage Weil /* 2094b5384d48SSage Weil * we round up to the block size at eof when 2095b5384d48SSage Weil * determining which extents to clone above, 2096b5384d48SSage Weil * but shouldn't round up the file size 2097b5384d48SSage Weil */ 2098b5384d48SSage Weil endoff = new_key.offset + datal; 20995f3888ffSLi Zefan if (endoff > destoff+olen) 21005f3888ffSLi Zefan endoff = destoff+olen; 2101b5384d48SSage Weil if (endoff > inode->i_size) 2102b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2103b5384d48SSage Weil 2104a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 2105a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2106a22285a6SYan, Zheng BUG_ON(ret); 2107a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2108a22285a6SYan, Zheng } 2109c5c9cd4dSSage Weil next: 211031840ae1SZheng Yan btrfs_release_path(root, path); 2111ae01a0abSYan Zheng key.offset++; 2112ae01a0abSYan Zheng } 2113f46b5a66SChristoph Hellwig ret = 0; 2114f46b5a66SChristoph Hellwig out: 2115ae01a0abSYan Zheng btrfs_release_path(root, path); 2116c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2117f46b5a66SChristoph Hellwig out_unlock: 2118f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2119f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2120ae01a0abSYan Zheng vfree(buf); 2121ae01a0abSYan Zheng btrfs_free_path(path); 2122f46b5a66SChristoph Hellwig out_fput: 2123f46b5a66SChristoph Hellwig fput(src_file); 2124ab67b7c1SYan Zheng out_drop_write: 2125ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2126f46b5a66SChristoph Hellwig return ret; 2127f46b5a66SChristoph Hellwig } 2128f46b5a66SChristoph Hellwig 21297a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2130c5c9cd4dSSage Weil { 2131c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2132c5c9cd4dSSage Weil 21337a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2134c5c9cd4dSSage Weil return -EFAULT; 2135c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2136c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2137c5c9cd4dSSage Weil } 2138c5c9cd4dSSage Weil 2139f46b5a66SChristoph Hellwig /* 2140f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2141f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2142f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2143f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2144f46b5a66SChristoph Hellwig */ 2145b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2146f46b5a66SChristoph Hellwig { 2147f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2148f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2149f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 21501ab86aedSSage Weil int ret; 2151f46b5a66SChristoph Hellwig 21521ab86aedSSage Weil ret = -EPERM; 2153df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2154f46b5a66SChristoph Hellwig goto out; 21551ab86aedSSage Weil 21561ab86aedSSage Weil ret = -EINPROGRESS; 21571ab86aedSSage Weil if (file->private_data) 21581ab86aedSSage Weil goto out; 21599ca9ee09SSage Weil 2160b83cc969SLi Zefan ret = -EROFS; 2161b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2162b83cc969SLi Zefan goto out; 2163b83cc969SLi Zefan 2164c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2165c146afadSYan Zheng if (ret) 2166c146afadSYan Zheng goto out; 2167c146afadSYan Zheng 21689ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 21699ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 21709ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21719ca9ee09SSage Weil 2172f46b5a66SChristoph Hellwig ret = -ENOMEM; 21731ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 2174abd30bb0STsutomu Itoh if (IS_ERR(trans)) 21751ab86aedSSage Weil goto out_drop; 21761ab86aedSSage Weil 21771ab86aedSSage Weil file->private_data = trans; 21781ab86aedSSage Weil return 0; 21791ab86aedSSage Weil 21801ab86aedSSage Weil out_drop: 21811ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 21821ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 21831ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21841ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2185f46b5a66SChristoph Hellwig out: 2186f46b5a66SChristoph Hellwig return ret; 2187f46b5a66SChristoph Hellwig } 2188f46b5a66SChristoph Hellwig 21896ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 21906ef5ed0dSJosef Bacik { 21916ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 21926ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 21936ef5ed0dSJosef Bacik struct btrfs_root *new_root; 21946ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 21956ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 21966ef5ed0dSJosef Bacik struct btrfs_path *path; 21976ef5ed0dSJosef Bacik struct btrfs_key location; 21986ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 21996ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 22006ef5ed0dSJosef Bacik u64 features; 22016ef5ed0dSJosef Bacik u64 objectid = 0; 22026ef5ed0dSJosef Bacik u64 dir_id; 22036ef5ed0dSJosef Bacik 22046ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 22056ef5ed0dSJosef Bacik return -EPERM; 22066ef5ed0dSJosef Bacik 22076ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 22086ef5ed0dSJosef Bacik return -EFAULT; 22096ef5ed0dSJosef Bacik 22106ef5ed0dSJosef Bacik if (!objectid) 22116ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 22126ef5ed0dSJosef Bacik 22136ef5ed0dSJosef Bacik location.objectid = objectid; 22146ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 22156ef5ed0dSJosef Bacik location.offset = (u64)-1; 22166ef5ed0dSJosef Bacik 22176ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 22186ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 22196ef5ed0dSJosef Bacik return PTR_ERR(new_root); 22206ef5ed0dSJosef Bacik 22216ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 22226ef5ed0dSJosef Bacik return -ENOENT; 22236ef5ed0dSJosef Bacik 22246ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 22256ef5ed0dSJosef Bacik if (!path) 22266ef5ed0dSJosef Bacik return -ENOMEM; 22276ef5ed0dSJosef Bacik path->leave_spinning = 1; 22286ef5ed0dSJosef Bacik 22296ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 223098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 22316ef5ed0dSJosef Bacik btrfs_free_path(path); 223298d5dc13STsutomu Itoh return PTR_ERR(trans); 22336ef5ed0dSJosef Bacik } 22346ef5ed0dSJosef Bacik 22356ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 22366ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 22376ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2238cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 22396ef5ed0dSJosef Bacik btrfs_free_path(path); 22406ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22416ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 22426ef5ed0dSJosef Bacik "this isn't going to work\n"); 22436ef5ed0dSJosef Bacik return -ENOENT; 22446ef5ed0dSJosef Bacik } 22456ef5ed0dSJosef Bacik 22466ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 22476ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 22486ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 22496ef5ed0dSJosef Bacik btrfs_free_path(path); 22506ef5ed0dSJosef Bacik 22516ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 22526ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 22536ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 22546ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 22556ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 22566ef5ed0dSJosef Bacik } 22576ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22586ef5ed0dSJosef Bacik 22596ef5ed0dSJosef Bacik return 0; 22606ef5ed0dSJosef Bacik } 22616ef5ed0dSJosef Bacik 2262bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2263bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2264bf5fc093SJosef Bacik { 2265bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2266bf5fc093SJosef Bacik 2267bf5fc093SJosef Bacik space->total_bytes = 0; 2268bf5fc093SJosef Bacik space->used_bytes = 0; 2269bf5fc093SJosef Bacik space->flags = 0; 2270bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2271bf5fc093SJosef Bacik space->flags = block_group->flags; 2272bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2273bf5fc093SJosef Bacik space->used_bytes += 2274bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2275bf5fc093SJosef Bacik } 2276bf5fc093SJosef Bacik } 2277bf5fc093SJosef Bacik 22781406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 22791406e432SJosef Bacik { 22801406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 22811406e432SJosef Bacik struct btrfs_ioctl_space_info space; 22821406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 22837fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 22847fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 22851406e432SJosef Bacik struct btrfs_space_info *info; 2286bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2287bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2288bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2289bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2290bf5fc093SJosef Bacik int num_types = 4; 22917fde62bfSChris Mason int alloc_size; 22921406e432SJosef Bacik int ret = 0; 229351788b1bSDan Rosenberg u64 slot_count = 0; 2294bf5fc093SJosef Bacik int i, c; 22951406e432SJosef Bacik 22961406e432SJosef Bacik if (copy_from_user(&space_args, 22971406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 22981406e432SJosef Bacik sizeof(space_args))) 22991406e432SJosef Bacik return -EFAULT; 23001406e432SJosef Bacik 2301bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2302bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2303bf5fc093SJosef Bacik 2304bf5fc093SJosef Bacik info = NULL; 23057fde62bfSChris Mason rcu_read_lock(); 2306bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2307bf5fc093SJosef Bacik list) { 2308bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2309bf5fc093SJosef Bacik info = tmp; 2310bf5fc093SJosef Bacik break; 2311bf5fc093SJosef Bacik } 2312bf5fc093SJosef Bacik } 23137fde62bfSChris Mason rcu_read_unlock(); 23141406e432SJosef Bacik 2315bf5fc093SJosef Bacik if (!info) 2316bf5fc093SJosef Bacik continue; 2317bf5fc093SJosef Bacik 2318bf5fc093SJosef Bacik down_read(&info->groups_sem); 2319bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2320bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2321bf5fc093SJosef Bacik slot_count++; 2322bf5fc093SJosef Bacik } 2323bf5fc093SJosef Bacik up_read(&info->groups_sem); 2324bf5fc093SJosef Bacik } 2325bf5fc093SJosef Bacik 23267fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 23277fde62bfSChris Mason if (space_args.space_slots == 0) { 23287fde62bfSChris Mason space_args.total_spaces = slot_count; 23297fde62bfSChris Mason goto out; 23307fde62bfSChris Mason } 2331bf5fc093SJosef Bacik 233251788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2333bf5fc093SJosef Bacik 23347fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2335bf5fc093SJosef Bacik 23367fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 23377fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 23387fde62bfSChris Mason */ 23397fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 23407fde62bfSChris Mason return -ENOMEM; 23417fde62bfSChris Mason 23427fde62bfSChris Mason space_args.total_spaces = 0; 23437fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 23447fde62bfSChris Mason if (!dest) 23457fde62bfSChris Mason return -ENOMEM; 23467fde62bfSChris Mason dest_orig = dest; 23477fde62bfSChris Mason 23487fde62bfSChris Mason /* now we have a buffer to copy into */ 2349bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2350bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2351bf5fc093SJosef Bacik 235251788b1bSDan Rosenberg if (!slot_count) 235351788b1bSDan Rosenberg break; 235451788b1bSDan Rosenberg 2355bf5fc093SJosef Bacik info = NULL; 23561406e432SJosef Bacik rcu_read_lock(); 2357bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2358bf5fc093SJosef Bacik list) { 2359bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2360bf5fc093SJosef Bacik info = tmp; 23617fde62bfSChris Mason break; 2362bf5fc093SJosef Bacik } 2363bf5fc093SJosef Bacik } 2364bf5fc093SJosef Bacik rcu_read_unlock(); 23657fde62bfSChris Mason 2366bf5fc093SJosef Bacik if (!info) 2367bf5fc093SJosef Bacik continue; 2368bf5fc093SJosef Bacik down_read(&info->groups_sem); 2369bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2370bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2371bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2372bf5fc093SJosef Bacik &space); 23737fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 23741406e432SJosef Bacik dest++; 23751406e432SJosef Bacik space_args.total_spaces++; 237651788b1bSDan Rosenberg slot_count--; 23771406e432SJosef Bacik } 237851788b1bSDan Rosenberg if (!slot_count) 237951788b1bSDan Rosenberg break; 2380bf5fc093SJosef Bacik } 2381bf5fc093SJosef Bacik up_read(&info->groups_sem); 2382bf5fc093SJosef Bacik } 23831406e432SJosef Bacik 23847fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 23857fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 23867fde62bfSChris Mason 23877fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 23887fde62bfSChris Mason ret = -EFAULT; 23897fde62bfSChris Mason 23907fde62bfSChris Mason kfree(dest_orig); 23917fde62bfSChris Mason out: 23927fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 23931406e432SJosef Bacik ret = -EFAULT; 23941406e432SJosef Bacik 23951406e432SJosef Bacik return ret; 23961406e432SJosef Bacik } 23971406e432SJosef Bacik 2398f46b5a66SChristoph Hellwig /* 2399f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2400f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2401f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2402f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2403f46b5a66SChristoph Hellwig */ 2404f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2405f46b5a66SChristoph Hellwig { 2406f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2407f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2408f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2409f46b5a66SChristoph Hellwig 2410f46b5a66SChristoph Hellwig trans = file->private_data; 24111ab86aedSSage Weil if (!trans) 24121ab86aedSSage Weil return -EINVAL; 2413b214107eSChristoph Hellwig file->private_data = NULL; 24149ca9ee09SSage Weil 24151ab86aedSSage Weil btrfs_end_transaction(trans, root); 24161ab86aedSSage Weil 24179ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 24189ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 24199ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 24209ca9ee09SSage Weil 2421cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 24221ab86aedSSage Weil return 0; 2423f46b5a66SChristoph Hellwig } 2424f46b5a66SChristoph Hellwig 242546204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 242646204592SSage Weil { 242746204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 242846204592SSage Weil struct btrfs_trans_handle *trans; 242946204592SSage Weil u64 transid; 2430db5b493aSTsutomu Itoh int ret; 243146204592SSage Weil 243246204592SSage Weil trans = btrfs_start_transaction(root, 0); 243398d5dc13STsutomu Itoh if (IS_ERR(trans)) 243498d5dc13STsutomu Itoh return PTR_ERR(trans); 243546204592SSage Weil transid = trans->transid; 2436db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 2437db5b493aSTsutomu Itoh if (ret) 2438db5b493aSTsutomu Itoh return ret; 243946204592SSage Weil 244046204592SSage Weil if (argp) 244146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 244246204592SSage Weil return -EFAULT; 244346204592SSage Weil return 0; 244446204592SSage Weil } 244546204592SSage Weil 244646204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 244746204592SSage Weil { 244846204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 244946204592SSage Weil u64 transid; 245046204592SSage Weil 245146204592SSage Weil if (argp) { 245246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 245346204592SSage Weil return -EFAULT; 245446204592SSage Weil } else { 245546204592SSage Weil transid = 0; /* current trans */ 245646204592SSage Weil } 245746204592SSage Weil return btrfs_wait_for_commit(root, transid); 245846204592SSage Weil } 245946204592SSage Weil 2460f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2461f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2462f46b5a66SChristoph Hellwig { 2463f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 24644bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2465f46b5a66SChristoph Hellwig 2466f46b5a66SChristoph Hellwig switch (cmd) { 24676cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 24686cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 24696cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 24706cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 24716cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 24726cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2473f7039b1dSLi Dongyang case FITRIM: 2474f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 2475f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2476fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2477fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2478fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 24793de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2480fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 248176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 248276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 24830caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 24840caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 24850caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 24860caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 24876ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 24886ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2489f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 24901e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 24911e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 24921e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2493f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 24944bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2495f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 24964bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2497f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 24984bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2499f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2500f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2501f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2502c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2503c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 25047a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2505f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2506f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2507f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2508f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2509ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2510ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2511ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2512ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 25131406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 25141406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2515f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2516f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2517f46b5a66SChristoph Hellwig return 0; 251846204592SSage Weil case BTRFS_IOC_START_SYNC: 251946204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 252046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 252146204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2522f46b5a66SChristoph Hellwig } 2523f46b5a66SChristoph Hellwig 2524f46b5a66SChristoph Hellwig return -ENOTTY; 2525f46b5a66SChristoph Hellwig } 2526