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> 434b4e25f2SChris Mason #include "compat.h" 44f46b5a66SChristoph Hellwig #include "ctree.h" 45f46b5a66SChristoph Hellwig #include "disk-io.h" 46f46b5a66SChristoph Hellwig #include "transaction.h" 47f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 48f46b5a66SChristoph Hellwig #include "ioctl.h" 49f46b5a66SChristoph Hellwig #include "print-tree.h" 50f46b5a66SChristoph Hellwig #include "volumes.h" 51925baeddSChris Mason #include "locking.h" 52f46b5a66SChristoph Hellwig 536cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 546cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 556cbff00fSChristoph Hellwig { 566cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 576cbff00fSChristoph Hellwig return flags; 586cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 596cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 606cbff00fSChristoph Hellwig else 616cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 626cbff00fSChristoph Hellwig } 63f46b5a66SChristoph Hellwig 646cbff00fSChristoph Hellwig /* 656cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 666cbff00fSChristoph Hellwig */ 676cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 686cbff00fSChristoph Hellwig { 696cbff00fSChristoph Hellwig unsigned int iflags = 0; 706cbff00fSChristoph Hellwig 716cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 726cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 736cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 746cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 756cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 766cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 786cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 806cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 826cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 836cbff00fSChristoph Hellwig 846cbff00fSChristoph Hellwig return iflags; 856cbff00fSChristoph Hellwig } 866cbff00fSChristoph Hellwig 876cbff00fSChristoph Hellwig /* 886cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 896cbff00fSChristoph Hellwig */ 906cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 916cbff00fSChristoph Hellwig { 926cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 936cbff00fSChristoph Hellwig 946cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 956cbff00fSChristoph Hellwig 966cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 976cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 986cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 996cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1006cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1016cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1026cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1036cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1046cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1056cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1066cbff00fSChristoph Hellwig } 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig /* 1096cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1106cbff00fSChristoph Hellwig * 1116cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1126cbff00fSChristoph Hellwig */ 1136cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1146cbff00fSChristoph Hellwig { 1150b4dcea5SChris Mason unsigned int flags; 1160b4dcea5SChris Mason 1170b4dcea5SChris Mason if (!dir) 1180b4dcea5SChris Mason return; 1190b4dcea5SChris Mason 1200b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1236cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1246cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1256cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1266cbff00fSChristoph Hellwig 1276cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1286cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1296cbff00fSChristoph Hellwig } 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1326cbff00fSChristoph Hellwig { 1336cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1346cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1376cbff00fSChristoph Hellwig return -EFAULT; 1386cbff00fSChristoph Hellwig return 0; 1396cbff00fSChristoph Hellwig } 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1426cbff00fSChristoph Hellwig { 1436cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1446cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1456cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1466cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1476cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1486cbff00fSChristoph Hellwig int ret; 1496cbff00fSChristoph Hellwig 1506cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1516cbff00fSChristoph Hellwig return -EFAULT; 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1546cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1556cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1566cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1596cbff00fSChristoph Hellwig return -EACCES; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1646cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1656cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1666cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1676cbff00fSChristoph Hellwig ret = -EPERM; 1686cbff00fSChristoph Hellwig goto out_unlock; 1696cbff00fSChristoph Hellwig } 1706cbff00fSChristoph Hellwig } 1716cbff00fSChristoph Hellwig 1726cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1736cbff00fSChristoph Hellwig if (ret) 1746cbff00fSChristoph Hellwig goto out_unlock; 1756cbff00fSChristoph Hellwig 1766cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1776cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1786cbff00fSChristoph Hellwig else 1796cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1806cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1816cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1826cbff00fSChristoph Hellwig else 1836cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1846cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1856cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1866cbff00fSChristoph Hellwig else 1876cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1886cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1896cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1906cbff00fSChristoph Hellwig else 1916cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1926cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1936cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1946cbff00fSChristoph Hellwig else 1956cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1966cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1976cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1986cbff00fSChristoph Hellwig else 1996cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2006cbff00fSChristoph Hellwig 2016cbff00fSChristoph Hellwig 2026cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2036cbff00fSChristoph Hellwig BUG_ON(!trans); 2046cbff00fSChristoph Hellwig 2056cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2066cbff00fSChristoph Hellwig BUG_ON(ret); 2076cbff00fSChristoph Hellwig 2086cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2096cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2106cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2116cbff00fSChristoph Hellwig 2126cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2136cbff00fSChristoph Hellwig out_unlock: 2146cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2156cbff00fSChristoph Hellwig return 0; 2166cbff00fSChristoph Hellwig } 2176cbff00fSChristoph Hellwig 2186cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2196cbff00fSChristoph Hellwig { 2206cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2236cbff00fSChristoph Hellwig } 224f46b5a66SChristoph Hellwig 225cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 226cb8e7090SChristoph Hellwig struct dentry *dentry, 22772fd032eSSage Weil char *name, int namelen, 22872fd032eSSage Weil u64 *async_transid) 229f46b5a66SChristoph Hellwig { 230f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 231f46b5a66SChristoph Hellwig struct btrfs_key key; 232f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 233f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 234f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23576dda93cSYan, Zheng struct btrfs_root *new_root; 2366a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 2376a912213SJosef Bacik struct inode *dir; 238f46b5a66SChristoph Hellwig int ret; 239f46b5a66SChristoph Hellwig int err; 240f46b5a66SChristoph Hellwig u64 objectid; 241f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2423de4586cSChris Mason u64 index = 0; 243f46b5a66SChristoph Hellwig 244a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 245a22285a6SYan, Zheng 0, &objectid); 2466a912213SJosef Bacik if (ret) { 2476a912213SJosef Bacik dput(parent); 248a22285a6SYan, Zheng return ret; 2496a912213SJosef Bacik } 2506a912213SJosef Bacik 2516a912213SJosef Bacik dir = parent->d_inode; 2526a912213SJosef Bacik 2539ed74f2dSJosef Bacik /* 2549ed74f2dSJosef Bacik * 1 - inode item 2559ed74f2dSJosef Bacik * 2 - refs 2569ed74f2dSJosef Bacik * 1 - root item 2579ed74f2dSJosef Bacik * 2 - dir items 2589ed74f2dSJosef Bacik */ 259a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 2606a912213SJosef Bacik if (IS_ERR(trans)) { 2616a912213SJosef Bacik dput(parent); 262a22285a6SYan, Zheng return PTR_ERR(trans); 2636a912213SJosef Bacik } 264f46b5a66SChristoph Hellwig 2655d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2665d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2678e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2688e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2698e8a1e31SJosef Bacik goto fail; 2708e8a1e31SJosef Bacik } 271f46b5a66SChristoph Hellwig 2725d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 273f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 274f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2755d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 276f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 277f46b5a66SChristoph Hellwig 278f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 279f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 280f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2815d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2825d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2835d4f98a2SYan Zheng BTRFS_UUID_SIZE); 284f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 285f46b5a66SChristoph Hellwig 286f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 287f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 288f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 289f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 290f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 291a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 292f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 293f46b5a66SChristoph Hellwig 294f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 29584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 296f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 297f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29886b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 300f46b5a66SChristoph Hellwig 301f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 302f46b5a66SChristoph Hellwig root_item.drop_level = 0; 303f46b5a66SChristoph Hellwig 304925baeddSChris Mason btrfs_tree_unlock(leaf); 305f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 306f46b5a66SChristoph Hellwig leaf = NULL; 307f46b5a66SChristoph Hellwig 308f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 309f46b5a66SChristoph Hellwig 310f46b5a66SChristoph Hellwig key.objectid = objectid; 3115d4f98a2SYan Zheng key.offset = 0; 312f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 313f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 314f46b5a66SChristoph Hellwig &root_item); 315f46b5a66SChristoph Hellwig if (ret) 316f46b5a66SChristoph Hellwig goto fail; 317f46b5a66SChristoph Hellwig 31876dda93cSYan, Zheng key.offset = (u64)-1; 31976dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 32076dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 32176dda93cSYan, Zheng 32276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 32376dda93cSYan, Zheng 32476dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 32576dda93cSYan, Zheng BTRFS_I(dir)->block_group); 326f46b5a66SChristoph Hellwig /* 327f46b5a66SChristoph Hellwig * insert the directory item 328f46b5a66SChristoph Hellwig */ 3293de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3303de4586cSChris Mason BUG_ON(ret); 3313de4586cSChris Mason 3323de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 333f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3343de4586cSChris Mason BTRFS_FT_DIR, index); 335f46b5a66SChristoph Hellwig if (ret) 336f46b5a66SChristoph Hellwig goto fail; 3370660b5afSChris Mason 33852c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33952c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 34052c26179SYan Zheng BUG_ON(ret); 34152c26179SYan Zheng 3420660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3434df27c4dSYan, Zheng objectid, root->root_key.objectid, 3440660b5afSChris Mason dir->i_ino, index, name, namelen); 34576dda93cSYan, Zheng 3460660b5afSChris Mason BUG_ON(ret); 3470660b5afSChris Mason 34876dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 349f46b5a66SChristoph Hellwig fail: 3506a912213SJosef Bacik dput(parent); 35172fd032eSSage Weil if (async_transid) { 35272fd032eSSage Weil *async_transid = trans->transid; 35372fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 35472fd032eSSage Weil } else { 35576dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 35672fd032eSSage Weil } 357f46b5a66SChristoph Hellwig if (err && !ret) 358f46b5a66SChristoph Hellwig ret = err; 359f46b5a66SChristoph Hellwig return ret; 360f46b5a66SChristoph Hellwig } 361f46b5a66SChristoph Hellwig 36272fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 36372fd032eSSage Weil char *name, int namelen, u64 *async_transid) 364f46b5a66SChristoph Hellwig { 3652e4bfab9SYan, Zheng struct inode *inode; 3666a912213SJosef Bacik struct dentry *parent; 367f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 368f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3692e4bfab9SYan, Zheng int ret; 370f46b5a66SChristoph Hellwig 371f46b5a66SChristoph Hellwig if (!root->ref_cows) 372f46b5a66SChristoph Hellwig return -EINVAL; 373f46b5a66SChristoph Hellwig 374a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 375a22285a6SYan, Zheng if (!pending_snapshot) 376a22285a6SYan, Zheng return -ENOMEM; 377a22285a6SYan, Zheng 378a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 379a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 380a22285a6SYan, Zheng pending_snapshot->root = root; 381a22285a6SYan, Zheng 382a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 383a22285a6SYan, Zheng if (IS_ERR(trans)) { 384a22285a6SYan, Zheng ret = PTR_ERR(trans); 385a22285a6SYan, Zheng goto fail; 386a22285a6SYan, Zheng } 387a22285a6SYan, Zheng 388a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 389a22285a6SYan, Zheng BUG_ON(ret); 390a22285a6SYan, Zheng 391a22285a6SYan, Zheng list_add(&pending_snapshot->list, 392a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 39372fd032eSSage Weil if (async_transid) { 39472fd032eSSage Weil *async_transid = trans->transid; 39572fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 39672fd032eSSage Weil root->fs_info->extent_root, 1); 39772fd032eSSage Weil } else { 39872fd032eSSage Weil ret = btrfs_commit_transaction(trans, 39972fd032eSSage Weil root->fs_info->extent_root); 40072fd032eSSage Weil } 401a22285a6SYan, Zheng BUG_ON(ret); 402a22285a6SYan, Zheng 403a22285a6SYan, Zheng ret = pending_snapshot->error; 404f46b5a66SChristoph Hellwig if (ret) 4052e4bfab9SYan, Zheng goto fail; 406f46b5a66SChristoph Hellwig 407a22285a6SYan, Zheng btrfs_orphan_cleanup(pending_snapshot->snap); 408f46b5a66SChristoph Hellwig 4096a912213SJosef Bacik parent = dget_parent(dentry); 4106a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 4116a912213SJosef Bacik dput(parent); 4122e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4132e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4142e4bfab9SYan, Zheng goto fail; 4152e4bfab9SYan, Zheng } 4162e4bfab9SYan, Zheng BUG_ON(!inode); 4172e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4182e4bfab9SYan, Zheng ret = 0; 4192e4bfab9SYan, Zheng fail: 420a22285a6SYan, Zheng kfree(pending_snapshot); 421f46b5a66SChristoph Hellwig return ret; 422f46b5a66SChristoph Hellwig } 423f46b5a66SChristoph Hellwig 4244260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 4254260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 4264260f7c7SSage Weil * minimal. 4274260f7c7SSage Weil */ 4284260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 4294260f7c7SSage Weil { 4304260f7c7SSage Weil uid_t fsuid = current_fsuid(); 4314260f7c7SSage Weil 4324260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 4334260f7c7SSage Weil return 0; 4344260f7c7SSage Weil if (inode->i_uid == fsuid) 4354260f7c7SSage Weil return 0; 4364260f7c7SSage Weil if (dir->i_uid == fsuid) 4374260f7c7SSage Weil return 0; 4384260f7c7SSage Weil return !capable(CAP_FOWNER); 4394260f7c7SSage Weil } 4404260f7c7SSage Weil 4414260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 4424260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 4434260f7c7SSage Weil * whether the type of victim is right. 4444260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 4454260f7c7SSage Weil * 2. We should have write and exec permissions on dir 4464260f7c7SSage Weil * 3. We can't remove anything from append-only dir 4474260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 4484260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 4494260f7c7SSage Weil * a. be owner of dir, or 4504260f7c7SSage Weil * b. be owner of victim, or 4514260f7c7SSage Weil * c. have CAP_FOWNER capability 4524260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 4534260f7c7SSage Weil * links pointing to it. 4544260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 4554260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 4564260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 4574260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 4584260f7c7SSage Weil * nfs_async_unlink(). 4594260f7c7SSage Weil */ 4604260f7c7SSage Weil 4614260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 4624260f7c7SSage Weil { 4634260f7c7SSage Weil int error; 4644260f7c7SSage Weil 4654260f7c7SSage Weil if (!victim->d_inode) 4664260f7c7SSage Weil return -ENOENT; 4674260f7c7SSage Weil 4684260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 4694260f7c7SSage Weil audit_inode_child(victim, dir); 4704260f7c7SSage Weil 4714260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 4724260f7c7SSage Weil if (error) 4734260f7c7SSage Weil return error; 4744260f7c7SSage Weil if (IS_APPEND(dir)) 4754260f7c7SSage Weil return -EPERM; 4764260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 4774260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 4784260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 4794260f7c7SSage Weil return -EPERM; 4804260f7c7SSage Weil if (isdir) { 4814260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 4824260f7c7SSage Weil return -ENOTDIR; 4834260f7c7SSage Weil if (IS_ROOT(victim)) 4844260f7c7SSage Weil return -EBUSY; 4854260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 4864260f7c7SSage Weil return -EISDIR; 4874260f7c7SSage Weil if (IS_DEADDIR(dir)) 4884260f7c7SSage Weil return -ENOENT; 4894260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 4904260f7c7SSage Weil return -EBUSY; 4914260f7c7SSage Weil return 0; 4924260f7c7SSage Weil } 4934260f7c7SSage Weil 494cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 495cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 496cb8e7090SChristoph Hellwig { 497cb8e7090SChristoph Hellwig if (child->d_inode) 498cb8e7090SChristoph Hellwig return -EEXIST; 499cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 500cb8e7090SChristoph Hellwig return -ENOENT; 501cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 502cb8e7090SChristoph Hellwig } 503cb8e7090SChristoph Hellwig 504cb8e7090SChristoph Hellwig /* 505cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 506cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 507cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 508cb8e7090SChristoph Hellwig */ 50976dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 51076dda93cSYan, Zheng char *name, int namelen, 51172fd032eSSage Weil struct btrfs_root *snap_src, 51272fd032eSSage Weil u64 *async_transid) 513cb8e7090SChristoph Hellwig { 51476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 515cb8e7090SChristoph Hellwig struct dentry *dentry; 516cb8e7090SChristoph Hellwig int error; 517cb8e7090SChristoph Hellwig 51876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 519cb8e7090SChristoph Hellwig 520cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 521cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 522cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 523cb8e7090SChristoph Hellwig goto out_unlock; 524cb8e7090SChristoph Hellwig 525cb8e7090SChristoph Hellwig error = -EEXIST; 526cb8e7090SChristoph Hellwig if (dentry->d_inode) 527cb8e7090SChristoph Hellwig goto out_dput; 528cb8e7090SChristoph Hellwig 529cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 530cb8e7090SChristoph Hellwig if (error) 531cb8e7090SChristoph Hellwig goto out_dput; 532cb8e7090SChristoph Hellwig 53376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 534cb8e7090SChristoph Hellwig if (error) 535cb8e7090SChristoph Hellwig goto out_drop_write; 536cb8e7090SChristoph Hellwig 53776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 53876dda93cSYan, Zheng 53976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 54076dda93cSYan, Zheng goto out_up_read; 54176dda93cSYan, Zheng 5423de4586cSChris Mason if (snap_src) { 54372fd032eSSage Weil error = create_snapshot(snap_src, dentry, 54472fd032eSSage Weil name, namelen, async_transid); 5453de4586cSChris Mason } else { 54676dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 54772fd032eSSage Weil name, namelen, async_transid); 5483de4586cSChris Mason } 54976dda93cSYan, Zheng if (!error) 55076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 55176dda93cSYan, Zheng out_up_read: 55276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 553cb8e7090SChristoph Hellwig out_drop_write: 554cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 555cb8e7090SChristoph Hellwig out_dput: 556cb8e7090SChristoph Hellwig dput(dentry); 557cb8e7090SChristoph Hellwig out_unlock: 55876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 559cb8e7090SChristoph Hellwig return error; 560cb8e7090SChristoph Hellwig } 561cb8e7090SChristoph Hellwig 562940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 5631e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 5641e701a32SChris Mason u64 *defrag_end) 565940100a4SChris Mason { 566940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 567940100a4SChris Mason struct extent_map *em = NULL; 568940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 569940100a4SChris Mason int ret = 1; 570940100a4SChris Mason 5711e701a32SChris Mason 5721e701a32SChris Mason if (thresh == 0) 5731e701a32SChris Mason thresh = 256 * 1024; 5741e701a32SChris Mason 575940100a4SChris Mason /* 576940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 577940100a4SChris Mason * defragging it 578940100a4SChris Mason */ 579940100a4SChris Mason if (start < *defrag_end) 580940100a4SChris Mason return 1; 581940100a4SChris Mason 582940100a4SChris Mason *skip = 0; 583940100a4SChris Mason 584940100a4SChris Mason /* 585940100a4SChris Mason * hopefully we have this extent in the tree already, try without 586940100a4SChris Mason * the full extent lock 587940100a4SChris Mason */ 588940100a4SChris Mason read_lock(&em_tree->lock); 589940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 590940100a4SChris Mason read_unlock(&em_tree->lock); 591940100a4SChris Mason 592940100a4SChris Mason if (!em) { 593940100a4SChris Mason /* get the big lock and read metadata off disk */ 594940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 595940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 596940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 597940100a4SChris Mason 5986cf8bfbfSDan Carpenter if (IS_ERR(em)) 599940100a4SChris Mason return 0; 600940100a4SChris Mason } 601940100a4SChris Mason 602940100a4SChris Mason /* this will cover holes, and inline extents */ 603940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 604940100a4SChris Mason ret = 0; 605940100a4SChris Mason 606940100a4SChris Mason /* 607940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 608940100a4SChris Mason */ 6091e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 610940100a4SChris Mason ret = 0; 611940100a4SChris Mason 612940100a4SChris Mason /* 613940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 614940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 615940100a4SChris Mason * so that the next tiny extent will force a defrag. 616940100a4SChris Mason * 617940100a4SChris Mason * The end result of this is that tiny extents before a single big 618940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 619940100a4SChris Mason */ 620940100a4SChris Mason if (ret) { 621940100a4SChris Mason *last_len += len; 622940100a4SChris Mason *defrag_end = extent_map_end(em); 623940100a4SChris Mason } else { 624940100a4SChris Mason *last_len = 0; 625940100a4SChris Mason *skip = extent_map_end(em); 626940100a4SChris Mason *defrag_end = 0; 627940100a4SChris Mason } 628940100a4SChris Mason 629940100a4SChris Mason free_extent_map(em); 630940100a4SChris Mason return ret; 631940100a4SChris Mason } 632940100a4SChris Mason 6331e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 6341e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 635f46b5a66SChristoph Hellwig { 636f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 637f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 638f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6393eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 640f46b5a66SChristoph Hellwig struct page *page; 641f46b5a66SChristoph Hellwig unsigned long last_index; 642f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 643f46b5a66SChristoph Hellwig unsigned long total_read = 0; 644f46b5a66SChristoph Hellwig u64 page_start; 645f46b5a66SChristoph Hellwig u64 page_end; 646940100a4SChris Mason u64 last_len = 0; 647940100a4SChris Mason u64 skip = 0; 648940100a4SChris Mason u64 defrag_end = 0; 649f46b5a66SChristoph Hellwig unsigned long i; 650f46b5a66SChristoph Hellwig int ret; 651f46b5a66SChristoph Hellwig 652940100a4SChris Mason if (inode->i_size == 0) 653940100a4SChris Mason return 0; 654f46b5a66SChristoph Hellwig 6551e701a32SChris Mason if (range->start + range->len > range->start) { 6561e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 6571e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 6581e701a32SChris Mason } else { 659940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 6601e701a32SChris Mason } 6611e701a32SChris Mason 6621e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 663940100a4SChris Mason while (i <= last_index) { 664940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 6651e701a32SChris Mason PAGE_CACHE_SIZE, 6661e701a32SChris Mason range->extent_thresh, 6671e701a32SChris Mason &last_len, &skip, 668940100a4SChris Mason &defrag_end)) { 669940100a4SChris Mason unsigned long next; 670940100a4SChris Mason /* 671940100a4SChris Mason * the should_defrag function tells us how much to skip 672940100a4SChris Mason * bump our counter by the suggested amount 673940100a4SChris Mason */ 674940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 675940100a4SChris Mason i = max(i + 1, next); 676940100a4SChris Mason continue; 677940100a4SChris Mason } 678940100a4SChris Mason 679f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 680f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 681f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 682f46b5a66SChristoph Hellwig } 683f46b5a66SChristoph Hellwig total_read++; 684940100a4SChris Mason mutex_lock(&inode->i_mutex); 6851e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6861e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 687940100a4SChris Mason 6880ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 6890ca1f7ceSYan, Zheng if (ret) 6900ca1f7ceSYan, Zheng goto err_unlock; 6913eaa2885SChris Mason again: 692940100a4SChris Mason if (inode->i_size == 0 || 693940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 694940100a4SChris Mason ret = 0; 695940100a4SChris Mason goto err_reservations; 696940100a4SChris Mason } 697940100a4SChris Mason 698f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 6990ca1f7ceSYan, Zheng if (!page) { 7000ca1f7ceSYan, Zheng ret = -ENOMEM; 701940100a4SChris Mason goto err_reservations; 7020ca1f7ceSYan, Zheng } 703940100a4SChris Mason 704f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 705f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 706f46b5a66SChristoph Hellwig lock_page(page); 707f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 708f46b5a66SChristoph Hellwig unlock_page(page); 709f46b5a66SChristoph Hellwig page_cache_release(page); 7100ca1f7ceSYan, Zheng ret = -EIO; 711940100a4SChris Mason goto err_reservations; 712f46b5a66SChristoph Hellwig } 713f46b5a66SChristoph Hellwig } 714f46b5a66SChristoph Hellwig 715940100a4SChris Mason if (page->mapping != inode->i_mapping) { 716940100a4SChris Mason unlock_page(page); 717940100a4SChris Mason page_cache_release(page); 718940100a4SChris Mason goto again; 719940100a4SChris Mason } 720940100a4SChris Mason 721f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 722f46b5a66SChristoph Hellwig 723940100a4SChris Mason if (PageDirty(page)) { 7240ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 725940100a4SChris Mason goto loop_unlock; 726940100a4SChris Mason } 727940100a4SChris Mason 728f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 729f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 730f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 7313eaa2885SChris Mason 7323eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 7333eaa2885SChris Mason if (ordered) { 7343eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 7353eaa2885SChris Mason unlock_page(page); 7363eaa2885SChris Mason page_cache_release(page); 7373eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 7383eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 7393eaa2885SChris Mason goto again; 7403eaa2885SChris Mason } 7413eaa2885SChris Mason set_page_extent_mapped(page); 7423eaa2885SChris Mason 743f87f057bSChris Mason /* 744f87f057bSChris Mason * this makes sure page_mkwrite is called on the 745f87f057bSChris Mason * page if it is dirtied again later 746f87f057bSChris Mason */ 747f87f057bSChris Mason clear_page_dirty_for_io(page); 748940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 749940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 750940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 751f87f057bSChris Mason 7522ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 753940100a4SChris Mason ClearPageChecked(page); 754f46b5a66SChristoph Hellwig set_page_dirty(page); 755a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 756940100a4SChris Mason 757940100a4SChris Mason loop_unlock: 758f46b5a66SChristoph Hellwig unlock_page(page); 759f46b5a66SChristoph Hellwig page_cache_release(page); 760940100a4SChris Mason mutex_unlock(&inode->i_mutex); 761940100a4SChris Mason 762f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 763940100a4SChris Mason i++; 764f46b5a66SChristoph Hellwig } 765f46b5a66SChristoph Hellwig 7661e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 7671e701a32SChris Mason filemap_flush(inode->i_mapping); 7681e701a32SChris Mason 7691e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 7701e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 7711e701a32SChris Mason * we have to make sure the IO is actually started and that 7721e701a32SChris Mason * ordered extents get created before we return 7731e701a32SChris Mason */ 7741e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 7751e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7761e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7771e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7781e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7791e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7801e701a32SChris Mason } 7811e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7821e701a32SChris Mason 7831e701a32SChris Mason mutex_lock(&inode->i_mutex); 7841e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7851e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7861e701a32SChris Mason } 7871e701a32SChris Mason 788f46b5a66SChristoph Hellwig return 0; 789940100a4SChris Mason 790940100a4SChris Mason err_reservations: 7910ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 7920ca1f7ceSYan, Zheng err_unlock: 793940100a4SChris Mason mutex_unlock(&inode->i_mutex); 794940100a4SChris Mason return ret; 795f46b5a66SChristoph Hellwig } 796f46b5a66SChristoph Hellwig 79776dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 79876dda93cSYan, Zheng void __user *arg) 799f46b5a66SChristoph Hellwig { 800f46b5a66SChristoph Hellwig u64 new_size; 801f46b5a66SChristoph Hellwig u64 old_size; 802f46b5a66SChristoph Hellwig u64 devid = 1; 803f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 804f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 805f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 806f46b5a66SChristoph Hellwig char *sizestr; 807f46b5a66SChristoph Hellwig char *devstr = NULL; 808f46b5a66SChristoph Hellwig int ret = 0; 809f46b5a66SChristoph Hellwig int mod = 0; 810f46b5a66SChristoph Hellwig 811c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 812c146afadSYan Zheng return -EROFS; 813c146afadSYan Zheng 814e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 815e441d54dSChris Mason return -EPERM; 816e441d54dSChris Mason 817dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 818dae7b665SLi Zefan if (IS_ERR(vol_args)) 819dae7b665SLi Zefan return PTR_ERR(vol_args); 8205516e595SMark Fasheh 8215516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 822f46b5a66SChristoph Hellwig 8237d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 824f46b5a66SChristoph Hellwig sizestr = vol_args->name; 825f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 826f46b5a66SChristoph Hellwig if (devstr) { 827f46b5a66SChristoph Hellwig char *end; 828f46b5a66SChristoph Hellwig sizestr = devstr + 1; 829f46b5a66SChristoph Hellwig *devstr = '\0'; 830f46b5a66SChristoph Hellwig devstr = vol_args->name; 831f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 83221380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 83321380931SJoel Becker (unsigned long long)devid); 834f46b5a66SChristoph Hellwig } 8352b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 836f46b5a66SChristoph Hellwig if (!device) { 83721380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 83821380931SJoel Becker (unsigned long long)devid); 839f46b5a66SChristoph Hellwig ret = -EINVAL; 840f46b5a66SChristoph Hellwig goto out_unlock; 841f46b5a66SChristoph Hellwig } 842f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 843f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 844f46b5a66SChristoph Hellwig else { 845f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 846f46b5a66SChristoph Hellwig mod = -1; 847f46b5a66SChristoph Hellwig sizestr++; 848f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 849f46b5a66SChristoph Hellwig mod = 1; 850f46b5a66SChristoph Hellwig sizestr++; 851f46b5a66SChristoph Hellwig } 85291748467SAkinobu Mita new_size = memparse(sizestr, NULL); 853f46b5a66SChristoph Hellwig if (new_size == 0) { 854f46b5a66SChristoph Hellwig ret = -EINVAL; 855f46b5a66SChristoph Hellwig goto out_unlock; 856f46b5a66SChristoph Hellwig } 857f46b5a66SChristoph Hellwig } 858f46b5a66SChristoph Hellwig 859f46b5a66SChristoph Hellwig old_size = device->total_bytes; 860f46b5a66SChristoph Hellwig 861f46b5a66SChristoph Hellwig if (mod < 0) { 862f46b5a66SChristoph Hellwig if (new_size > old_size) { 863f46b5a66SChristoph Hellwig ret = -EINVAL; 864f46b5a66SChristoph Hellwig goto out_unlock; 865f46b5a66SChristoph Hellwig } 866f46b5a66SChristoph Hellwig new_size = old_size - new_size; 867f46b5a66SChristoph Hellwig } else if (mod > 0) { 868f46b5a66SChristoph Hellwig new_size = old_size + new_size; 869f46b5a66SChristoph Hellwig } 870f46b5a66SChristoph Hellwig 871f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 872f46b5a66SChristoph Hellwig ret = -EINVAL; 873f46b5a66SChristoph Hellwig goto out_unlock; 874f46b5a66SChristoph Hellwig } 875f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 876f46b5a66SChristoph Hellwig ret = -EFBIG; 877f46b5a66SChristoph Hellwig goto out_unlock; 878f46b5a66SChristoph Hellwig } 879f46b5a66SChristoph Hellwig 880f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 881f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 882f46b5a66SChristoph Hellwig 883f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 884f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 885f46b5a66SChristoph Hellwig 886f46b5a66SChristoph Hellwig if (new_size > old_size) { 887a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 888f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 889f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 890f46b5a66SChristoph Hellwig } else { 891f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 892f46b5a66SChristoph Hellwig } 893f46b5a66SChristoph Hellwig 894f46b5a66SChristoph Hellwig out_unlock: 8957d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 896f46b5a66SChristoph Hellwig kfree(vol_args); 897f46b5a66SChristoph Hellwig return ret; 898f46b5a66SChristoph Hellwig } 899f46b5a66SChristoph Hellwig 90072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 90172fd032eSSage Weil char *name, 90272fd032eSSage Weil unsigned long fd, 90372fd032eSSage Weil int subvol, 90472fd032eSSage Weil u64 *transid) 905f46b5a66SChristoph Hellwig { 906cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 9073de4586cSChris Mason struct file *src_file; 908f46b5a66SChristoph Hellwig int namelen; 9093de4586cSChris Mason int ret = 0; 910f46b5a66SChristoph Hellwig 911c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 912c146afadSYan Zheng return -EROFS; 913c146afadSYan Zheng 91472fd032eSSage Weil namelen = strlen(name); 91572fd032eSSage Weil if (strchr(name, '/')) { 916f46b5a66SChristoph Hellwig ret = -EINVAL; 917f46b5a66SChristoph Hellwig goto out; 918f46b5a66SChristoph Hellwig } 919f46b5a66SChristoph Hellwig 9203de4586cSChris Mason if (subvol) { 92172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 92272fd032eSSage Weil NULL, transid); 923cb8e7090SChristoph Hellwig } else { 9243de4586cSChris Mason struct inode *src_inode; 92572fd032eSSage Weil src_file = fget(fd); 9263de4586cSChris Mason if (!src_file) { 9273de4586cSChris Mason ret = -EINVAL; 9283de4586cSChris Mason goto out; 9293de4586cSChris Mason } 9303de4586cSChris Mason 9313de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 9323de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 933d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 934d397712bSChris Mason "another FS\n"); 9353de4586cSChris Mason ret = -EINVAL; 9363de4586cSChris Mason fput(src_file); 9373de4586cSChris Mason goto out; 9383de4586cSChris Mason } 93972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 94072fd032eSSage Weil BTRFS_I(src_inode)->root, 94172fd032eSSage Weil transid); 9423de4586cSChris Mason fput(src_file); 943cb8e7090SChristoph Hellwig } 944f46b5a66SChristoph Hellwig out: 94572fd032eSSage Weil return ret; 94672fd032eSSage Weil } 94772fd032eSSage Weil 94872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 949*fa0d2b9bSLi Zefan void __user *arg, int subvol) 95072fd032eSSage Weil { 951*fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 95272fd032eSSage Weil int ret; 95372fd032eSSage Weil 954*fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 955*fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 956*fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 957*fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 958*fa0d2b9bSLi Zefan 959*fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 960*fa0d2b9bSLi Zefan vol_args->fd, subvol, NULL); 961*fa0d2b9bSLi Zefan 962*fa0d2b9bSLi Zefan kfree(vol_args); 963*fa0d2b9bSLi Zefan return ret; 964*fa0d2b9bSLi Zefan } 965*fa0d2b9bSLi Zefan 966*fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 967*fa0d2b9bSLi Zefan void __user *arg, int subvol) 968*fa0d2b9bSLi Zefan { 969*fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 970*fa0d2b9bSLi Zefan int ret; 971fdfb1e4fSLi Zefan u64 transid = 0; 972fdfb1e4fSLi Zefan u64 *ptr = NULL; 97372fd032eSSage Weil 974*fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 975*fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 976*fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 977*fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 978fdfb1e4fSLi Zefan 979*fa0d2b9bSLi Zefan if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ASYNC) { 980fdfb1e4fSLi Zefan ret = -EINVAL; 981fdfb1e4fSLi Zefan goto out; 982fdfb1e4fSLi Zefan } 983fdfb1e4fSLi Zefan 984*fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 985fdfb1e4fSLi Zefan ptr = &transid; 98675eaa0e2SSage Weil 987*fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 988*fa0d2b9bSLi Zefan vol_args->fd, subvol, ptr); 98975eaa0e2SSage Weil 990fdfb1e4fSLi Zefan if (ret == 0 && ptr && 99175eaa0e2SSage Weil copy_to_user(arg + 992fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 993fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 99475eaa0e2SSage Weil ret = -EFAULT; 995fdfb1e4fSLi Zefan out: 996f46b5a66SChristoph Hellwig kfree(vol_args); 997f46b5a66SChristoph Hellwig return ret; 998f46b5a66SChristoph Hellwig } 999f46b5a66SChristoph Hellwig 100076dda93cSYan, Zheng /* 100176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 100276dda93cSYan, Zheng */ 100376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 100476dda93cSYan, Zheng { 100576dda93cSYan, Zheng struct btrfs_path *path; 100676dda93cSYan, Zheng struct btrfs_key key; 100776dda93cSYan, Zheng int ret; 100876dda93cSYan, Zheng 100976dda93cSYan, Zheng path = btrfs_alloc_path(); 101076dda93cSYan, Zheng if (!path) 101176dda93cSYan, Zheng return -ENOMEM; 101276dda93cSYan, Zheng 101376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 101476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 101576dda93cSYan, Zheng key.offset = (u64)-1; 101676dda93cSYan, Zheng 101776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 101876dda93cSYan, Zheng &key, path, 0, 0); 101976dda93cSYan, Zheng if (ret < 0) 102076dda93cSYan, Zheng goto out; 102176dda93cSYan, Zheng BUG_ON(ret == 0); 102276dda93cSYan, Zheng 102376dda93cSYan, Zheng ret = 0; 102476dda93cSYan, Zheng if (path->slots[0] > 0) { 102576dda93cSYan, Zheng path->slots[0]--; 102676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 102776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 102876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 102976dda93cSYan, Zheng ret = -ENOTEMPTY; 103076dda93cSYan, Zheng } 103176dda93cSYan, Zheng out: 103276dda93cSYan, Zheng btrfs_free_path(path); 103376dda93cSYan, Zheng return ret; 103476dda93cSYan, Zheng } 103576dda93cSYan, Zheng 1036ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1037ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1038ac8e9819SChris Mason { 1039abc6e134SChris Mason struct btrfs_key test; 1040abc6e134SChris Mason int ret; 1041abc6e134SChris Mason 1042abc6e134SChris Mason test.objectid = sk->min_objectid; 1043abc6e134SChris Mason test.type = sk->min_type; 1044abc6e134SChris Mason test.offset = sk->min_offset; 1045abc6e134SChris Mason 1046abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1047abc6e134SChris Mason if (ret < 0) 1048ac8e9819SChris Mason return 0; 1049abc6e134SChris Mason 1050abc6e134SChris Mason test.objectid = sk->max_objectid; 1051abc6e134SChris Mason test.type = sk->max_type; 1052abc6e134SChris Mason test.offset = sk->max_offset; 1053abc6e134SChris Mason 1054abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1055abc6e134SChris Mason if (ret > 0) 1056ac8e9819SChris Mason return 0; 1057ac8e9819SChris Mason return 1; 1058ac8e9819SChris Mason } 1059ac8e9819SChris Mason 1060ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1061ac8e9819SChris Mason struct btrfs_path *path, 1062ac8e9819SChris Mason struct btrfs_key *key, 1063ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1064ac8e9819SChris Mason char *buf, 1065ac8e9819SChris Mason unsigned long *sk_offset, 1066ac8e9819SChris Mason int *num_found) 1067ac8e9819SChris Mason { 1068ac8e9819SChris Mason u64 found_transid; 1069ac8e9819SChris Mason struct extent_buffer *leaf; 1070ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1071ac8e9819SChris Mason unsigned long item_off; 1072ac8e9819SChris Mason unsigned long item_len; 1073ac8e9819SChris Mason int nritems; 1074ac8e9819SChris Mason int i; 1075ac8e9819SChris Mason int slot; 1076ac8e9819SChris Mason int found = 0; 1077ac8e9819SChris Mason int ret = 0; 1078ac8e9819SChris Mason 1079ac8e9819SChris Mason leaf = path->nodes[0]; 1080ac8e9819SChris Mason slot = path->slots[0]; 1081ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1082ac8e9819SChris Mason 1083ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1084ac8e9819SChris Mason i = nritems; 1085ac8e9819SChris Mason goto advance_key; 1086ac8e9819SChris Mason } 1087ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1088ac8e9819SChris Mason 1089ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1090ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1091ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1092ac8e9819SChris Mason 1093ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1094ac8e9819SChris Mason item_len = 0; 1095ac8e9819SChris Mason 1096ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1097ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1098ac8e9819SChris Mason ret = 1; 1099ac8e9819SChris Mason goto overflow; 1100ac8e9819SChris Mason } 1101ac8e9819SChris Mason 1102ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1103ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1104ac8e9819SChris Mason continue; 1105ac8e9819SChris Mason 1106ac8e9819SChris Mason sh.objectid = key->objectid; 1107ac8e9819SChris Mason sh.offset = key->offset; 1108ac8e9819SChris Mason sh.type = key->type; 1109ac8e9819SChris Mason sh.len = item_len; 1110ac8e9819SChris Mason sh.transid = found_transid; 1111ac8e9819SChris Mason 1112ac8e9819SChris Mason /* copy search result header */ 1113ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1114ac8e9819SChris Mason *sk_offset += sizeof(sh); 1115ac8e9819SChris Mason 1116ac8e9819SChris Mason if (item_len) { 1117ac8e9819SChris Mason char *p = buf + *sk_offset; 1118ac8e9819SChris Mason /* copy the item */ 1119ac8e9819SChris Mason read_extent_buffer(leaf, p, 1120ac8e9819SChris Mason item_off, item_len); 1121ac8e9819SChris Mason *sk_offset += item_len; 1122ac8e9819SChris Mason } 112390fdde14SChris Mason found++; 1124ac8e9819SChris Mason 1125ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1126ac8e9819SChris Mason break; 1127ac8e9819SChris Mason } 1128ac8e9819SChris Mason advance_key: 1129ac8e9819SChris Mason ret = 0; 1130abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1131abc6e134SChris Mason key->offset++; 1132abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1133abc6e134SChris Mason key->offset = 0; 1134abc6e134SChris Mason key->type++; 1135abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1136abc6e134SChris Mason key->offset = 0; 1137abc6e134SChris Mason key->type = 0; 1138abc6e134SChris Mason key->objectid++; 1139abc6e134SChris Mason } else 1140abc6e134SChris Mason ret = 1; 1141ac8e9819SChris Mason overflow: 1142ac8e9819SChris Mason *num_found += found; 1143ac8e9819SChris Mason return ret; 1144ac8e9819SChris Mason } 1145ac8e9819SChris Mason 1146ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1147ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1148ac8e9819SChris Mason { 1149ac8e9819SChris Mason struct btrfs_root *root; 1150ac8e9819SChris Mason struct btrfs_key key; 1151ac8e9819SChris Mason struct btrfs_key max_key; 1152ac8e9819SChris Mason struct btrfs_path *path; 1153ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1154ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1155ac8e9819SChris Mason int ret; 1156ac8e9819SChris Mason int num_found = 0; 1157ac8e9819SChris Mason unsigned long sk_offset = 0; 1158ac8e9819SChris Mason 1159ac8e9819SChris Mason path = btrfs_alloc_path(); 1160ac8e9819SChris Mason if (!path) 1161ac8e9819SChris Mason return -ENOMEM; 1162ac8e9819SChris Mason 1163ac8e9819SChris Mason if (sk->tree_id == 0) { 1164ac8e9819SChris Mason /* search the root of the inode that was passed */ 1165ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1166ac8e9819SChris Mason } else { 1167ac8e9819SChris Mason key.objectid = sk->tree_id; 1168ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1169ac8e9819SChris Mason key.offset = (u64)-1; 1170ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1171ac8e9819SChris Mason if (IS_ERR(root)) { 1172ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1173ac8e9819SChris Mason sk->tree_id); 1174ac8e9819SChris Mason btrfs_free_path(path); 1175ac8e9819SChris Mason return -ENOENT; 1176ac8e9819SChris Mason } 1177ac8e9819SChris Mason } 1178ac8e9819SChris Mason 1179ac8e9819SChris Mason key.objectid = sk->min_objectid; 1180ac8e9819SChris Mason key.type = sk->min_type; 1181ac8e9819SChris Mason key.offset = sk->min_offset; 1182ac8e9819SChris Mason 1183ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1184ac8e9819SChris Mason max_key.type = sk->max_type; 1185ac8e9819SChris Mason max_key.offset = sk->max_offset; 1186ac8e9819SChris Mason 1187ac8e9819SChris Mason path->keep_locks = 1; 1188ac8e9819SChris Mason 1189ac8e9819SChris Mason while(1) { 1190ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1191ac8e9819SChris Mason sk->min_transid); 1192ac8e9819SChris Mason if (ret != 0) { 1193ac8e9819SChris Mason if (ret > 0) 1194ac8e9819SChris Mason ret = 0; 1195ac8e9819SChris Mason goto err; 1196ac8e9819SChris Mason } 1197ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1198ac8e9819SChris Mason &sk_offset, &num_found); 1199ac8e9819SChris Mason btrfs_release_path(root, path); 1200ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1201ac8e9819SChris Mason break; 1202ac8e9819SChris Mason 1203ac8e9819SChris Mason } 1204ac8e9819SChris Mason ret = 0; 1205ac8e9819SChris Mason err: 1206ac8e9819SChris Mason sk->nr_items = num_found; 1207ac8e9819SChris Mason btrfs_free_path(path); 1208ac8e9819SChris Mason return ret; 1209ac8e9819SChris Mason } 1210ac8e9819SChris Mason 1211ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1212ac8e9819SChris Mason void __user *argp) 1213ac8e9819SChris Mason { 1214ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1215ac8e9819SChris Mason struct inode *inode; 1216ac8e9819SChris Mason int ret; 1217ac8e9819SChris Mason 1218ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1219ac8e9819SChris Mason return -EPERM; 1220ac8e9819SChris Mason 12212354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 12222354d08fSJulia Lawall if (IS_ERR(args)) 12232354d08fSJulia Lawall return PTR_ERR(args); 1224ac8e9819SChris Mason 1225ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1226ac8e9819SChris Mason ret = search_ioctl(inode, args); 1227ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1228ac8e9819SChris Mason ret = -EFAULT; 1229ac8e9819SChris Mason kfree(args); 1230ac8e9819SChris Mason return ret; 1231ac8e9819SChris Mason } 1232ac8e9819SChris Mason 123398d377a0STARUISI Hiroaki /* 1234ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1235ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 123698d377a0STARUISI Hiroaki */ 123798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 123898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 123998d377a0STARUISI Hiroaki { 124098d377a0STARUISI Hiroaki struct btrfs_root *root; 124198d377a0STARUISI Hiroaki struct btrfs_key key; 1242ac8e9819SChris Mason char *ptr; 124398d377a0STARUISI Hiroaki int ret = -1; 124498d377a0STARUISI Hiroaki int slot; 124598d377a0STARUISI Hiroaki int len; 124698d377a0STARUISI Hiroaki int total_len = 0; 124798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 124898d377a0STARUISI Hiroaki struct extent_buffer *l; 124998d377a0STARUISI Hiroaki struct btrfs_path *path; 125098d377a0STARUISI Hiroaki 125198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 125298d377a0STARUISI Hiroaki name[0]='\0'; 125398d377a0STARUISI Hiroaki return 0; 125498d377a0STARUISI Hiroaki } 125598d377a0STARUISI Hiroaki 125698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 125798d377a0STARUISI Hiroaki if (!path) 125898d377a0STARUISI Hiroaki return -ENOMEM; 125998d377a0STARUISI Hiroaki 1260ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 126198d377a0STARUISI Hiroaki 126298d377a0STARUISI Hiroaki key.objectid = tree_id; 126398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 126498d377a0STARUISI Hiroaki key.offset = (u64)-1; 126598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 126698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 126798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 12688ad6fcabSChris Mason ret = -ENOENT; 12698ad6fcabSChris Mason goto out; 127098d377a0STARUISI Hiroaki } 127198d377a0STARUISI Hiroaki 127298d377a0STARUISI Hiroaki key.objectid = dirid; 127398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 12748ad6fcabSChris Mason key.offset = (u64)-1; 127598d377a0STARUISI Hiroaki 127698d377a0STARUISI Hiroaki while(1) { 127798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 127898d377a0STARUISI Hiroaki if (ret < 0) 127998d377a0STARUISI Hiroaki goto out; 128098d377a0STARUISI Hiroaki 128198d377a0STARUISI Hiroaki l = path->nodes[0]; 128298d377a0STARUISI Hiroaki slot = path->slots[0]; 12838ad6fcabSChris Mason if (ret > 0 && slot > 0) 12848ad6fcabSChris Mason slot--; 128598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 128698d377a0STARUISI Hiroaki 128798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1288ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1289ac8e9819SChris Mason ret = -ENOENT; 129098d377a0STARUISI Hiroaki goto out; 1291ac8e9819SChris Mason } 129298d377a0STARUISI Hiroaki 129398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 129498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 129598d377a0STARUISI Hiroaki ptr -= len + 1; 129698d377a0STARUISI Hiroaki total_len += len + 1; 1297ac8e9819SChris Mason if (ptr < name) 129898d377a0STARUISI Hiroaki goto out; 129998d377a0STARUISI Hiroaki 130098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 130198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 130298d377a0STARUISI Hiroaki 130398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 130498d377a0STARUISI Hiroaki break; 130598d377a0STARUISI Hiroaki 130698d377a0STARUISI Hiroaki btrfs_release_path(root, path); 130798d377a0STARUISI Hiroaki key.objectid = key.offset; 13088ad6fcabSChris Mason key.offset = (u64)-1; 130998d377a0STARUISI Hiroaki dirid = key.objectid; 131098d377a0STARUISI Hiroaki 131198d377a0STARUISI Hiroaki } 1312ac8e9819SChris Mason if (ptr < name) 131398d377a0STARUISI Hiroaki goto out; 1314ac8e9819SChris Mason memcpy(name, ptr, total_len); 131598d377a0STARUISI Hiroaki name[total_len]='\0'; 131698d377a0STARUISI Hiroaki ret = 0; 131798d377a0STARUISI Hiroaki out: 131898d377a0STARUISI Hiroaki btrfs_free_path(path); 1319ac8e9819SChris Mason return ret; 1320ac8e9819SChris Mason } 1321ac8e9819SChris Mason 1322ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1323ac8e9819SChris Mason void __user *argp) 1324ac8e9819SChris Mason { 1325ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1326ac8e9819SChris Mason struct inode *inode; 1327ac8e9819SChris Mason int ret; 1328ac8e9819SChris Mason 1329ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1330ac8e9819SChris Mason return -EPERM; 1331ac8e9819SChris Mason 13322354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 13332354d08fSJulia Lawall if (IS_ERR(args)) 13342354d08fSJulia Lawall return PTR_ERR(args); 1335c2b96929SDan Carpenter 1336ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1337ac8e9819SChris Mason 13381b53ac4dSChris Mason if (args->treeid == 0) 13391b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 13401b53ac4dSChris Mason 1341ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1342ac8e9819SChris Mason args->treeid, args->objectid, 1343ac8e9819SChris Mason args->name); 1344ac8e9819SChris Mason 1345ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1346ac8e9819SChris Mason ret = -EFAULT; 1347ac8e9819SChris Mason 1348ac8e9819SChris Mason kfree(args); 134998d377a0STARUISI Hiroaki return ret; 135098d377a0STARUISI Hiroaki } 135198d377a0STARUISI Hiroaki 135276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 135376dda93cSYan, Zheng void __user *arg) 135476dda93cSYan, Zheng { 135576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 135676dda93cSYan, Zheng struct dentry *dentry; 135776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 135876dda93cSYan, Zheng struct inode *inode; 135976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 136076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 136176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 136276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 136376dda93cSYan, Zheng int namelen; 136476dda93cSYan, Zheng int ret; 136576dda93cSYan, Zheng int err = 0; 136676dda93cSYan, Zheng 136776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 136876dda93cSYan, Zheng if (IS_ERR(vol_args)) 136976dda93cSYan, Zheng return PTR_ERR(vol_args); 137076dda93cSYan, Zheng 137176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 137276dda93cSYan, Zheng namelen = strlen(vol_args->name); 137376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 137476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 137576dda93cSYan, Zheng err = -EINVAL; 137676dda93cSYan, Zheng goto out; 137776dda93cSYan, Zheng } 137876dda93cSYan, Zheng 137976dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 138076dda93cSYan, Zheng if (err) 138176dda93cSYan, Zheng goto out; 138276dda93cSYan, Zheng 138376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 138476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 138576dda93cSYan, Zheng if (IS_ERR(dentry)) { 138676dda93cSYan, Zheng err = PTR_ERR(dentry); 138776dda93cSYan, Zheng goto out_unlock_dir; 138876dda93cSYan, Zheng } 138976dda93cSYan, Zheng 139076dda93cSYan, Zheng if (!dentry->d_inode) { 139176dda93cSYan, Zheng err = -ENOENT; 139276dda93cSYan, Zheng goto out_dput; 139376dda93cSYan, Zheng } 139476dda93cSYan, Zheng 139576dda93cSYan, Zheng inode = dentry->d_inode; 13964260f7c7SSage Weil dest = BTRFS_I(inode)->root; 13974260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 13984260f7c7SSage Weil /* 13994260f7c7SSage Weil * Regular user. Only allow this with a special mount 14004260f7c7SSage Weil * option, when the user has write+exec access to the 14014260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 14024260f7c7SSage Weil * allowed. 14034260f7c7SSage Weil * 14044260f7c7SSage Weil * Note that this is _not_ check that the subvol is 14054260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 14064260f7c7SSage Weil * otherwise be able to delete. 14074260f7c7SSage Weil * 14084260f7c7SSage Weil * Users who want to delete empty subvols should try 14094260f7c7SSage Weil * rmdir(2). 14104260f7c7SSage Weil */ 14114260f7c7SSage Weil err = -EPERM; 14124260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 14134260f7c7SSage Weil goto out_dput; 14144260f7c7SSage Weil 14154260f7c7SSage Weil /* 14164260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 14174260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 14184260f7c7SSage Weil * must be called on the dentry referencing the root 14194260f7c7SSage Weil * of the subvol, not a random directory contained 14204260f7c7SSage Weil * within it. 14214260f7c7SSage Weil */ 14224260f7c7SSage Weil err = -EINVAL; 14234260f7c7SSage Weil if (root == dest) 14244260f7c7SSage Weil goto out_dput; 14254260f7c7SSage Weil 14264260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 14274260f7c7SSage Weil if (err) 14284260f7c7SSage Weil goto out_dput; 14294260f7c7SSage Weil 14304260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 14314260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 14324260f7c7SSage Weil if (err) 14334260f7c7SSage Weil goto out_dput; 14344260f7c7SSage Weil } 14354260f7c7SSage Weil 143676dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 143776dda93cSYan, Zheng err = -EINVAL; 143876dda93cSYan, Zheng goto out_dput; 143976dda93cSYan, Zheng } 144076dda93cSYan, Zheng 144176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 144276dda93cSYan, Zheng err = d_invalidate(dentry); 144376dda93cSYan, Zheng if (err) 144476dda93cSYan, Zheng goto out_unlock; 144576dda93cSYan, Zheng 144676dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 144776dda93cSYan, Zheng 144876dda93cSYan, Zheng err = may_destroy_subvol(dest); 144976dda93cSYan, Zheng if (err) 145076dda93cSYan, Zheng goto out_up_write; 145176dda93cSYan, Zheng 1452a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1453a22285a6SYan, Zheng if (IS_ERR(trans)) { 1454a22285a6SYan, Zheng err = PTR_ERR(trans); 1455d327099aSDan Carpenter goto out_up_write; 1456a22285a6SYan, Zheng } 1457a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1458a22285a6SYan, Zheng 145976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 146076dda93cSYan, Zheng dest->root_key.objectid, 146176dda93cSYan, Zheng dentry->d_name.name, 146276dda93cSYan, Zheng dentry->d_name.len); 146376dda93cSYan, Zheng BUG_ON(ret); 146476dda93cSYan, Zheng 146576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 146676dda93cSYan, Zheng 146776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 146876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 146976dda93cSYan, Zheng dest->root_item.drop_level = 0; 147076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 147176dda93cSYan, Zheng 1472d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 147376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 147476dda93cSYan, Zheng root->fs_info->tree_root, 147576dda93cSYan, Zheng dest->root_key.objectid); 147676dda93cSYan, Zheng BUG_ON(ret); 1477d68fc57bSYan, Zheng } 147876dda93cSYan, Zheng 1479531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 148076dda93cSYan, Zheng BUG_ON(ret); 148176dda93cSYan, Zheng inode->i_flags |= S_DEAD; 148276dda93cSYan, Zheng out_up_write: 148376dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 148476dda93cSYan, Zheng out_unlock: 148576dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 148676dda93cSYan, Zheng if (!err) { 1487efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 148876dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 148976dda93cSYan, Zheng d_delete(dentry); 149076dda93cSYan, Zheng } 149176dda93cSYan, Zheng out_dput: 149276dda93cSYan, Zheng dput(dentry); 149376dda93cSYan, Zheng out_unlock_dir: 149476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 149576dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 149676dda93cSYan, Zheng out: 149776dda93cSYan, Zheng kfree(vol_args); 149876dda93cSYan, Zheng return err; 149976dda93cSYan, Zheng } 150076dda93cSYan, Zheng 15011e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1502f46b5a66SChristoph Hellwig { 1503f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1504f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 15051e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1506c146afadSYan Zheng int ret; 1507c146afadSYan Zheng 1508c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1509c146afadSYan Zheng if (ret) 1510c146afadSYan Zheng return ret; 1511f46b5a66SChristoph Hellwig 1512f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1513f46b5a66SChristoph Hellwig case S_IFDIR: 1514e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1515e441d54dSChris Mason ret = -EPERM; 1516e441d54dSChris Mason goto out; 1517e441d54dSChris Mason } 15188929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 15198929ecfaSYan, Zheng if (ret) 15208929ecfaSYan, Zheng goto out; 15218929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1522f46b5a66SChristoph Hellwig break; 1523f46b5a66SChristoph Hellwig case S_IFREG: 1524e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1525e441d54dSChris Mason ret = -EINVAL; 1526e441d54dSChris Mason goto out; 1527e441d54dSChris Mason } 15281e701a32SChris Mason 15291e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 15301e701a32SChris Mason if (!range) { 15311e701a32SChris Mason ret = -ENOMEM; 15321e701a32SChris Mason goto out; 15331e701a32SChris Mason } 15341e701a32SChris Mason 15351e701a32SChris Mason if (argp) { 15361e701a32SChris Mason if (copy_from_user(range, argp, 15371e701a32SChris Mason sizeof(*range))) { 15381e701a32SChris Mason ret = -EFAULT; 15391e701a32SChris Mason kfree(range); 1540683be16eSDan Carpenter goto out; 15411e701a32SChris Mason } 15421e701a32SChris Mason /* compression requires us to start the IO */ 15431e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 15441e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 15451e701a32SChris Mason range->extent_thresh = (u32)-1; 15461e701a32SChris Mason } 15471e701a32SChris Mason } else { 15481e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 15491e701a32SChris Mason range->len = (u64)-1; 15501e701a32SChris Mason } 15518929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 15521e701a32SChris Mason kfree(range); 1553f46b5a66SChristoph Hellwig break; 15548929ecfaSYan, Zheng default: 15558929ecfaSYan, Zheng ret = -EINVAL; 1556f46b5a66SChristoph Hellwig } 1557e441d54dSChris Mason out: 1558ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1559e441d54dSChris Mason return ret; 1560f46b5a66SChristoph Hellwig } 1561f46b5a66SChristoph Hellwig 1562b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1563f46b5a66SChristoph Hellwig { 1564f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1565f46b5a66SChristoph Hellwig int ret; 1566f46b5a66SChristoph Hellwig 1567e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1568e441d54dSChris Mason return -EPERM; 1569e441d54dSChris Mason 1570dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1571dae7b665SLi Zefan if (IS_ERR(vol_args)) 1572dae7b665SLi Zefan return PTR_ERR(vol_args); 1573f46b5a66SChristoph Hellwig 15745516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1575f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1576f46b5a66SChristoph Hellwig 1577f46b5a66SChristoph Hellwig kfree(vol_args); 1578f46b5a66SChristoph Hellwig return ret; 1579f46b5a66SChristoph Hellwig } 1580f46b5a66SChristoph Hellwig 1581b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1582f46b5a66SChristoph Hellwig { 1583f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1584f46b5a66SChristoph Hellwig int ret; 1585f46b5a66SChristoph Hellwig 1586e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1587e441d54dSChris Mason return -EPERM; 1588e441d54dSChris Mason 1589c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1590c146afadSYan Zheng return -EROFS; 1591c146afadSYan Zheng 1592dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1593dae7b665SLi Zefan if (IS_ERR(vol_args)) 1594dae7b665SLi Zefan return PTR_ERR(vol_args); 1595f46b5a66SChristoph Hellwig 15965516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1597f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1598f46b5a66SChristoph Hellwig 1599f46b5a66SChristoph Hellwig kfree(vol_args); 1600f46b5a66SChristoph Hellwig return ret; 1601f46b5a66SChristoph Hellwig } 1602f46b5a66SChristoph Hellwig 160376dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1604b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1605f46b5a66SChristoph Hellwig { 1606f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1607f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1608f46b5a66SChristoph Hellwig struct file *src_file; 1609f46b5a66SChristoph Hellwig struct inode *src; 1610f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1611f46b5a66SChristoph Hellwig struct btrfs_path *path; 1612f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1613ae01a0abSYan Zheng char *buf; 1614ae01a0abSYan Zheng struct btrfs_key key; 1615f46b5a66SChristoph Hellwig u32 nritems; 1616f46b5a66SChristoph Hellwig int slot; 1617ae01a0abSYan Zheng int ret; 1618c5c9cd4dSSage Weil u64 len = olen; 1619c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1620c5c9cd4dSSage Weil u64 hint_byte; 1621d20f7043SChris Mason 1622c5c9cd4dSSage Weil /* 1623c5c9cd4dSSage Weil * TODO: 1624c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1625c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1626c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1627c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1628c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1629c5c9cd4dSSage Weil * they don't overlap)? 1630c5c9cd4dSSage Weil */ 1631c5c9cd4dSSage Weil 1632e441d54dSChris Mason /* the destination must be opened for writing */ 16332ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1634e441d54dSChris Mason return -EINVAL; 1635e441d54dSChris Mason 1636c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1637c146afadSYan Zheng if (ret) 1638c146afadSYan Zheng return ret; 1639c146afadSYan Zheng 1640c5c9cd4dSSage Weil src_file = fget(srcfd); 1641ab67b7c1SYan Zheng if (!src_file) { 1642ab67b7c1SYan Zheng ret = -EBADF; 1643ab67b7c1SYan Zheng goto out_drop_write; 1644ab67b7c1SYan Zheng } 16455dc64164SDan Rosenberg 1646f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1647f46b5a66SChristoph Hellwig 1648c5c9cd4dSSage Weil ret = -EINVAL; 1649c5c9cd4dSSage Weil if (src == inode) 1650c5c9cd4dSSage Weil goto out_fput; 1651c5c9cd4dSSage Weil 16525dc64164SDan Rosenberg /* the src must be open for reading */ 16535dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 16545dc64164SDan Rosenberg goto out_fput; 16555dc64164SDan Rosenberg 1656ae01a0abSYan Zheng ret = -EISDIR; 1657ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1658f46b5a66SChristoph Hellwig goto out_fput; 1659f46b5a66SChristoph Hellwig 1660ae01a0abSYan Zheng ret = -EXDEV; 1661ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1662ae01a0abSYan Zheng goto out_fput; 1663ae01a0abSYan Zheng 1664ae01a0abSYan Zheng ret = -ENOMEM; 1665ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1666ae01a0abSYan Zheng if (!buf) 1667ae01a0abSYan Zheng goto out_fput; 1668ae01a0abSYan Zheng 1669ae01a0abSYan Zheng path = btrfs_alloc_path(); 1670ae01a0abSYan Zheng if (!path) { 1671ae01a0abSYan Zheng vfree(buf); 1672ae01a0abSYan Zheng goto out_fput; 1673ae01a0abSYan Zheng } 1674ae01a0abSYan Zheng path->reada = 2; 1675ae01a0abSYan Zheng 1676f46b5a66SChristoph Hellwig if (inode < src) { 1677fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1678fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1679f46b5a66SChristoph Hellwig } else { 1680fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1681fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1682f46b5a66SChristoph Hellwig } 1683f46b5a66SChristoph Hellwig 1684c5c9cd4dSSage Weil /* determine range to clone */ 1685c5c9cd4dSSage Weil ret = -EINVAL; 16862ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1687f46b5a66SChristoph Hellwig goto out_unlock; 1688c5c9cd4dSSage Weil if (len == 0) 1689c5c9cd4dSSage Weil olen = len = src->i_size - off; 1690c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1691c5c9cd4dSSage Weil if (off + len == src->i_size) 16922a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1693c5c9cd4dSSage Weil 1694c5c9cd4dSSage Weil /* verify the end result is block aligned */ 16952a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 16962a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1697c5c9cd4dSSage Weil goto out_unlock; 1698c5c9cd4dSSage Weil 1699f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1700f46b5a66SChristoph Hellwig another, and lock file content */ 1701f46b5a66SChristoph Hellwig while (1) { 170231840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1703c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 17049a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 17059a019196SSage Weil if (!ordered && 17069a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 17079a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1708f46b5a66SChristoph Hellwig break; 1709c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1710ae01a0abSYan Zheng if (ordered) 1711ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 17129a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1713f46b5a66SChristoph Hellwig } 1714f46b5a66SChristoph Hellwig 1715c5c9cd4dSSage Weil /* clone data */ 1716f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1717ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1718ae01a0abSYan Zheng key.offset = 0; 1719f46b5a66SChristoph Hellwig 1720f46b5a66SChristoph Hellwig while (1) { 1721f46b5a66SChristoph Hellwig /* 1722f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1723f46b5a66SChristoph Hellwig * tree. 1724f46b5a66SChristoph Hellwig */ 1725a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1726f46b5a66SChristoph Hellwig if (ret < 0) 1727f46b5a66SChristoph Hellwig goto out; 1728f46b5a66SChristoph Hellwig 1729ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1730ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1731f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1732f46b5a66SChristoph Hellwig if (ret < 0) 1733f46b5a66SChristoph Hellwig goto out; 1734f46b5a66SChristoph Hellwig if (ret > 0) 1735f46b5a66SChristoph Hellwig break; 1736ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1737f46b5a66SChristoph Hellwig } 1738f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1739f46b5a66SChristoph Hellwig slot = path->slots[0]; 1740f46b5a66SChristoph Hellwig 1741ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1742d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1743f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1744f46b5a66SChristoph Hellwig break; 1745f46b5a66SChristoph Hellwig 1746c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1747c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1748c5c9cd4dSSage Weil int type; 174931840ae1SZheng Yan u32 size; 175031840ae1SZheng Yan struct btrfs_key new_key; 1751c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1752c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1753c5c9cd4dSSage Weil u8 comp; 1754b5384d48SSage Weil u64 endoff; 175531840ae1SZheng Yan 175631840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 175731840ae1SZheng Yan read_extent_buffer(leaf, buf, 175831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 175931840ae1SZheng Yan size); 1760c5c9cd4dSSage Weil 1761c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1762c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1763c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1764c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1765c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1766c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1767d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1768d397712bSChris Mason extent); 1769d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1770d397712bSChris Mason extent); 1771c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1772d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1773d397712bSChris Mason extent); 1774c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1775c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1776c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1777c5c9cd4dSSage Weil extent); 1778c5c9cd4dSSage Weil } 177931840ae1SZheng Yan btrfs_release_path(root, path); 178031840ae1SZheng Yan 1781050006a7SSage Weil if (key.offset + datal <= off || 1782c5c9cd4dSSage Weil key.offset >= off+len) 1783c5c9cd4dSSage Weil goto next; 1784c5c9cd4dSSage Weil 178531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 178631840ae1SZheng Yan new_key.objectid = inode->i_ino; 1787c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1788c5c9cd4dSSage Weil 1789a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1790a22285a6SYan, Zheng if (IS_ERR(trans)) { 1791a22285a6SYan, Zheng ret = PTR_ERR(trans); 1792a22285a6SYan, Zheng goto out; 1793a22285a6SYan, Zheng } 1794a22285a6SYan, Zheng 1795c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1796c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1797a22285a6SYan, Zheng if (off > key.offset) { 1798a22285a6SYan, Zheng datao += off - key.offset; 1799a22285a6SYan, Zheng datal -= off - key.offset; 1800a22285a6SYan, Zheng } 1801a22285a6SYan, Zheng 1802a22285a6SYan, Zheng if (key.offset + datal > off + len) 1803a22285a6SYan, Zheng datal = off + len - key.offset; 1804a22285a6SYan, Zheng 1805a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1806a22285a6SYan, Zheng new_key.offset, 1807a22285a6SYan, Zheng new_key.offset + datal, 1808a22285a6SYan, Zheng &hint_byte, 1); 1809a22285a6SYan, Zheng BUG_ON(ret); 1810a22285a6SYan, Zheng 181131840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 181231840ae1SZheng Yan &new_key, size); 1813a22285a6SYan, Zheng BUG_ON(ret); 181431840ae1SZheng Yan 181531840ae1SZheng Yan leaf = path->nodes[0]; 181631840ae1SZheng Yan slot = path->slots[0]; 181731840ae1SZheng Yan write_extent_buffer(leaf, buf, 181831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 181931840ae1SZheng Yan size); 1820ae01a0abSYan Zheng 1821f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1822f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1823c5c9cd4dSSage Weil 1824c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1825c5c9cd4dSSage Weil if (!disko) 1826c5c9cd4dSSage Weil datao = 0; 1827c5c9cd4dSSage Weil 1828c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1829c5c9cd4dSSage Weil datao); 1830c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1831c5c9cd4dSSage Weil datal); 1832c5c9cd4dSSage Weil if (disko) { 1833c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1834ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 18355d4f98a2SYan Zheng disko, diskl, 0, 1836f46b5a66SChristoph Hellwig root->root_key.objectid, 18375d4f98a2SYan Zheng inode->i_ino, 18385d4f98a2SYan Zheng new_key.offset - datao); 1839ae01a0abSYan Zheng BUG_ON(ret); 1840f46b5a66SChristoph Hellwig } 1841c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1842c5c9cd4dSSage Weil u64 skip = 0; 1843c5c9cd4dSSage Weil u64 trim = 0; 1844c5c9cd4dSSage Weil if (off > key.offset) { 1845c5c9cd4dSSage Weil skip = off - key.offset; 1846c5c9cd4dSSage Weil new_key.offset += skip; 184731840ae1SZheng Yan } 1848d397712bSChris Mason 1849c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1850c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1851d397712bSChris Mason 1852c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1853c5c9cd4dSSage Weil ret = -EINVAL; 1854a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1855c5c9cd4dSSage Weil goto out; 185631840ae1SZheng Yan } 1857c5c9cd4dSSage Weil size -= skip + trim; 1858c5c9cd4dSSage Weil datal -= skip + trim; 1859a22285a6SYan, Zheng 1860a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1861a22285a6SYan, Zheng new_key.offset, 1862a22285a6SYan, Zheng new_key.offset + datal, 1863a22285a6SYan, Zheng &hint_byte, 1); 1864a22285a6SYan, Zheng BUG_ON(ret); 1865a22285a6SYan, Zheng 1866c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1867c5c9cd4dSSage Weil &new_key, size); 1868a22285a6SYan, Zheng BUG_ON(ret); 1869c5c9cd4dSSage Weil 1870c5c9cd4dSSage Weil if (skip) { 1871d397712bSChris Mason u32 start = 1872d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1873c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1874c5c9cd4dSSage Weil datal); 1875c5c9cd4dSSage Weil } 1876c5c9cd4dSSage Weil 1877c5c9cd4dSSage Weil leaf = path->nodes[0]; 1878c5c9cd4dSSage Weil slot = path->slots[0]; 1879c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1880c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1881c5c9cd4dSSage Weil size); 1882c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1883c5c9cd4dSSage Weil } 1884c5c9cd4dSSage Weil 1885c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1886a22285a6SYan, Zheng btrfs_release_path(root, path); 1887c5c9cd4dSSage Weil 1888a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1889b5384d48SSage Weil 1890b5384d48SSage Weil /* 1891b5384d48SSage Weil * we round up to the block size at eof when 1892b5384d48SSage Weil * determining which extents to clone above, 1893b5384d48SSage Weil * but shouldn't round up the file size 1894b5384d48SSage Weil */ 1895b5384d48SSage Weil endoff = new_key.offset + datal; 18965f3888ffSLi Zefan if (endoff > destoff+olen) 18975f3888ffSLi Zefan endoff = destoff+olen; 1898b5384d48SSage Weil if (endoff > inode->i_size) 1899b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 1900b5384d48SSage Weil 1901a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1902a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 1903a22285a6SYan, Zheng BUG_ON(ret); 1904a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1905a22285a6SYan, Zheng } 1906c5c9cd4dSSage Weil next: 190731840ae1SZheng Yan btrfs_release_path(root, path); 1908ae01a0abSYan Zheng key.offset++; 1909ae01a0abSYan Zheng } 1910f46b5a66SChristoph Hellwig ret = 0; 1911f46b5a66SChristoph Hellwig out: 1912ae01a0abSYan Zheng btrfs_release_path(root, path); 1913c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1914f46b5a66SChristoph Hellwig out_unlock: 1915f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1916f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1917ae01a0abSYan Zheng vfree(buf); 1918ae01a0abSYan Zheng btrfs_free_path(path); 1919f46b5a66SChristoph Hellwig out_fput: 1920f46b5a66SChristoph Hellwig fput(src_file); 1921ab67b7c1SYan Zheng out_drop_write: 1922ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1923f46b5a66SChristoph Hellwig return ret; 1924f46b5a66SChristoph Hellwig } 1925f46b5a66SChristoph Hellwig 19267a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1927c5c9cd4dSSage Weil { 1928c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1929c5c9cd4dSSage Weil 19307a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1931c5c9cd4dSSage Weil return -EFAULT; 1932c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1933c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1934c5c9cd4dSSage Weil } 1935c5c9cd4dSSage Weil 1936f46b5a66SChristoph Hellwig /* 1937f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1938f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1939f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1940f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1941f46b5a66SChristoph Hellwig */ 1942b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1943f46b5a66SChristoph Hellwig { 1944f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1945f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1946f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 19471ab86aedSSage Weil int ret; 1948f46b5a66SChristoph Hellwig 19491ab86aedSSage Weil ret = -EPERM; 1950df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1951f46b5a66SChristoph Hellwig goto out; 19521ab86aedSSage Weil 19531ab86aedSSage Weil ret = -EINPROGRESS; 19541ab86aedSSage Weil if (file->private_data) 19551ab86aedSSage Weil goto out; 19569ca9ee09SSage Weil 1957c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1958c146afadSYan Zheng if (ret) 1959c146afadSYan Zheng goto out; 1960c146afadSYan Zheng 19619ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19629ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 19639ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19649ca9ee09SSage Weil 1965f46b5a66SChristoph Hellwig ret = -ENOMEM; 19661ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 19671ab86aedSSage Weil if (!trans) 19681ab86aedSSage Weil goto out_drop; 19691ab86aedSSage Weil 19701ab86aedSSage Weil file->private_data = trans; 19711ab86aedSSage Weil return 0; 19721ab86aedSSage Weil 19731ab86aedSSage Weil out_drop: 19741ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 19751ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 19761ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19771ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1978f46b5a66SChristoph Hellwig out: 1979f46b5a66SChristoph Hellwig return ret; 1980f46b5a66SChristoph Hellwig } 1981f46b5a66SChristoph Hellwig 19826ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 19836ef5ed0dSJosef Bacik { 19846ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 19856ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 19866ef5ed0dSJosef Bacik struct btrfs_root *new_root; 19876ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 19886ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 19896ef5ed0dSJosef Bacik struct btrfs_path *path; 19906ef5ed0dSJosef Bacik struct btrfs_key location; 19916ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 19926ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 19936ef5ed0dSJosef Bacik u64 features; 19946ef5ed0dSJosef Bacik u64 objectid = 0; 19956ef5ed0dSJosef Bacik u64 dir_id; 19966ef5ed0dSJosef Bacik 19976ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 19986ef5ed0dSJosef Bacik return -EPERM; 19996ef5ed0dSJosef Bacik 20006ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 20016ef5ed0dSJosef Bacik return -EFAULT; 20026ef5ed0dSJosef Bacik 20036ef5ed0dSJosef Bacik if (!objectid) 20046ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 20056ef5ed0dSJosef Bacik 20066ef5ed0dSJosef Bacik location.objectid = objectid; 20076ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 20086ef5ed0dSJosef Bacik location.offset = (u64)-1; 20096ef5ed0dSJosef Bacik 20106ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 20116ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 20126ef5ed0dSJosef Bacik return PTR_ERR(new_root); 20136ef5ed0dSJosef Bacik 20146ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 20156ef5ed0dSJosef Bacik return -ENOENT; 20166ef5ed0dSJosef Bacik 20176ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 20186ef5ed0dSJosef Bacik if (!path) 20196ef5ed0dSJosef Bacik return -ENOMEM; 20206ef5ed0dSJosef Bacik path->leave_spinning = 1; 20216ef5ed0dSJosef Bacik 20226ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 20236ef5ed0dSJosef Bacik if (!trans) { 20246ef5ed0dSJosef Bacik btrfs_free_path(path); 20256ef5ed0dSJosef Bacik return -ENOMEM; 20266ef5ed0dSJosef Bacik } 20276ef5ed0dSJosef Bacik 20286ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 20296ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 20306ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2031cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 20326ef5ed0dSJosef Bacik btrfs_free_path(path); 20336ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 20346ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 20356ef5ed0dSJosef Bacik "this isn't going to work\n"); 20366ef5ed0dSJosef Bacik return -ENOENT; 20376ef5ed0dSJosef Bacik } 20386ef5ed0dSJosef Bacik 20396ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 20406ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 20416ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 20426ef5ed0dSJosef Bacik btrfs_free_path(path); 20436ef5ed0dSJosef Bacik 20446ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 20456ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 20466ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 20476ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 20486ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 20496ef5ed0dSJosef Bacik } 20506ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 20516ef5ed0dSJosef Bacik 20526ef5ed0dSJosef Bacik return 0; 20536ef5ed0dSJosef Bacik } 20546ef5ed0dSJosef Bacik 2055bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2056bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2057bf5fc093SJosef Bacik { 2058bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2059bf5fc093SJosef Bacik 2060bf5fc093SJosef Bacik space->total_bytes = 0; 2061bf5fc093SJosef Bacik space->used_bytes = 0; 2062bf5fc093SJosef Bacik space->flags = 0; 2063bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2064bf5fc093SJosef Bacik space->flags = block_group->flags; 2065bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2066bf5fc093SJosef Bacik space->used_bytes += 2067bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2068bf5fc093SJosef Bacik } 2069bf5fc093SJosef Bacik } 2070bf5fc093SJosef Bacik 20711406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 20721406e432SJosef Bacik { 20731406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 20741406e432SJosef Bacik struct btrfs_ioctl_space_info space; 20751406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 20767fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 20777fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 20781406e432SJosef Bacik struct btrfs_space_info *info; 2079bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2080bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2081bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2082bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2083bf5fc093SJosef Bacik int num_types = 4; 20847fde62bfSChris Mason int alloc_size; 20851406e432SJosef Bacik int ret = 0; 20867fde62bfSChris Mason int slot_count = 0; 2087bf5fc093SJosef Bacik int i, c; 20881406e432SJosef Bacik 20891406e432SJosef Bacik if (copy_from_user(&space_args, 20901406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 20911406e432SJosef Bacik sizeof(space_args))) 20921406e432SJosef Bacik return -EFAULT; 20931406e432SJosef Bacik 2094bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2095bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2096bf5fc093SJosef Bacik 2097bf5fc093SJosef Bacik info = NULL; 20987fde62bfSChris Mason rcu_read_lock(); 2099bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2100bf5fc093SJosef Bacik list) { 2101bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2102bf5fc093SJosef Bacik info = tmp; 2103bf5fc093SJosef Bacik break; 2104bf5fc093SJosef Bacik } 2105bf5fc093SJosef Bacik } 21067fde62bfSChris Mason rcu_read_unlock(); 21071406e432SJosef Bacik 2108bf5fc093SJosef Bacik if (!info) 2109bf5fc093SJosef Bacik continue; 2110bf5fc093SJosef Bacik 2111bf5fc093SJosef Bacik down_read(&info->groups_sem); 2112bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2113bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2114bf5fc093SJosef Bacik slot_count++; 2115bf5fc093SJosef Bacik } 2116bf5fc093SJosef Bacik up_read(&info->groups_sem); 2117bf5fc093SJosef Bacik } 2118bf5fc093SJosef Bacik 21197fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 21207fde62bfSChris Mason if (space_args.space_slots == 0) { 21217fde62bfSChris Mason space_args.total_spaces = slot_count; 21227fde62bfSChris Mason goto out; 21237fde62bfSChris Mason } 2124bf5fc093SJosef Bacik 2125bf5fc093SJosef Bacik slot_count = min_t(int, space_args.space_slots, slot_count); 2126bf5fc093SJosef Bacik 21277fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2128bf5fc093SJosef Bacik 21297fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 21307fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 21317fde62bfSChris Mason */ 21327fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 21337fde62bfSChris Mason return -ENOMEM; 21347fde62bfSChris Mason 21357fde62bfSChris Mason space_args.total_spaces = 0; 21367fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 21377fde62bfSChris Mason if (!dest) 21387fde62bfSChris Mason return -ENOMEM; 21397fde62bfSChris Mason dest_orig = dest; 21407fde62bfSChris Mason 21417fde62bfSChris Mason /* now we have a buffer to copy into */ 2142bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2143bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2144bf5fc093SJosef Bacik 2145bf5fc093SJosef Bacik info = NULL; 21461406e432SJosef Bacik rcu_read_lock(); 2147bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2148bf5fc093SJosef Bacik list) { 2149bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2150bf5fc093SJosef Bacik info = tmp; 21517fde62bfSChris Mason break; 2152bf5fc093SJosef Bacik } 2153bf5fc093SJosef Bacik } 2154bf5fc093SJosef Bacik rcu_read_unlock(); 21557fde62bfSChris Mason 2156bf5fc093SJosef Bacik if (!info) 2157bf5fc093SJosef Bacik continue; 2158bf5fc093SJosef Bacik down_read(&info->groups_sem); 2159bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2160bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2161bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2162bf5fc093SJosef Bacik &space); 21637fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 21641406e432SJosef Bacik dest++; 21651406e432SJosef Bacik space_args.total_spaces++; 21661406e432SJosef Bacik } 2167bf5fc093SJosef Bacik } 2168bf5fc093SJosef Bacik up_read(&info->groups_sem); 2169bf5fc093SJosef Bacik } 21701406e432SJosef Bacik 21717fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 21727fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 21737fde62bfSChris Mason 21747fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 21757fde62bfSChris Mason ret = -EFAULT; 21767fde62bfSChris Mason 21777fde62bfSChris Mason kfree(dest_orig); 21787fde62bfSChris Mason out: 21797fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 21801406e432SJosef Bacik ret = -EFAULT; 21811406e432SJosef Bacik 21821406e432SJosef Bacik return ret; 21831406e432SJosef Bacik } 21841406e432SJosef Bacik 2185f46b5a66SChristoph Hellwig /* 2186f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2187f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2188f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2189f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2190f46b5a66SChristoph Hellwig */ 2191f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2192f46b5a66SChristoph Hellwig { 2193f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2194f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2195f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2196f46b5a66SChristoph Hellwig 2197f46b5a66SChristoph Hellwig trans = file->private_data; 21981ab86aedSSage Weil if (!trans) 21991ab86aedSSage Weil return -EINVAL; 2200b214107eSChristoph Hellwig file->private_data = NULL; 22019ca9ee09SSage Weil 22021ab86aedSSage Weil btrfs_end_transaction(trans, root); 22031ab86aedSSage Weil 22049ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 22059ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 22069ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 22079ca9ee09SSage Weil 2208cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 22091ab86aedSSage Weil return 0; 2210f46b5a66SChristoph Hellwig } 2211f46b5a66SChristoph Hellwig 221246204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 221346204592SSage Weil { 221446204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 221546204592SSage Weil struct btrfs_trans_handle *trans; 221646204592SSage Weil u64 transid; 221746204592SSage Weil 221846204592SSage Weil trans = btrfs_start_transaction(root, 0); 221946204592SSage Weil transid = trans->transid; 222046204592SSage Weil btrfs_commit_transaction_async(trans, root, 0); 222146204592SSage Weil 222246204592SSage Weil if (argp) 222346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 222446204592SSage Weil return -EFAULT; 222546204592SSage Weil return 0; 222646204592SSage Weil } 222746204592SSage Weil 222846204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 222946204592SSage Weil { 223046204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 223146204592SSage Weil u64 transid; 223246204592SSage Weil 223346204592SSage Weil if (argp) { 223446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 223546204592SSage Weil return -EFAULT; 223646204592SSage Weil } else { 223746204592SSage Weil transid = 0; /* current trans */ 223846204592SSage Weil } 223946204592SSage Weil return btrfs_wait_for_commit(root, transid); 224046204592SSage Weil } 224146204592SSage Weil 2242f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2243f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2244f46b5a66SChristoph Hellwig { 2245f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 22464bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2247f46b5a66SChristoph Hellwig 2248f46b5a66SChristoph Hellwig switch (cmd) { 22496cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 22506cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 22516cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 22526cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 22536cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 22546cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2255f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2256*fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2257fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2258*fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 22593de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2260*fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 226176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 226276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 22636ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 22646ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2265f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 22661e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 22671e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 22681e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2269f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 22704bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2271f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 22724bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2273f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 22744bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2275f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2276f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2277f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2278c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2279c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 22807a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2281f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2282f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2283f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2284f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2285ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2286ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2287ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2288ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 22891406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 22901406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2291f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2292f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2293f46b5a66SChristoph Hellwig return 0; 229446204592SSage Weil case BTRFS_IOC_START_SYNC: 229546204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 229646204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 229746204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2298f46b5a66SChristoph Hellwig } 2299f46b5a66SChristoph Hellwig 2300f46b5a66SChristoph Hellwig return -ENOTTY; 2301f46b5a66SChristoph Hellwig } 2302