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/smp_lock.h> 31f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 32cb8e7090SChristoph Hellwig #include <linux/mount.h> 33f46b5a66SChristoph Hellwig #include <linux/mpage.h> 34cb8e7090SChristoph Hellwig #include <linux/namei.h> 35f46b5a66SChristoph Hellwig #include <linux/swap.h> 36f46b5a66SChristoph Hellwig #include <linux/writeback.h> 37f46b5a66SChristoph Hellwig #include <linux/statfs.h> 38f46b5a66SChristoph Hellwig #include <linux/compat.h> 39f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 40cb8e7090SChristoph Hellwig #include <linux/security.h> 41f46b5a66SChristoph Hellwig #include <linux/xattr.h> 427ea394f1SYan Zheng #include <linux/vmalloc.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 { 1156cbff00fSChristoph Hellwig unsigned int flags = BTRFS_I(dir)->flags; 1166cbff00fSChristoph Hellwig 1176cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1186cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1196cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1206cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1236cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1246cbff00fSChristoph Hellwig } 1256cbff00fSChristoph Hellwig 1266cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1276cbff00fSChristoph Hellwig { 1286cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1296cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1326cbff00fSChristoph Hellwig return -EFAULT; 1336cbff00fSChristoph Hellwig return 0; 1346cbff00fSChristoph Hellwig } 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1376cbff00fSChristoph Hellwig { 1386cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1396cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1406cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1416cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1426cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1436cbff00fSChristoph Hellwig int ret; 1446cbff00fSChristoph Hellwig 1456cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1466cbff00fSChristoph Hellwig return -EFAULT; 1476cbff00fSChristoph Hellwig 1486cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1496cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1506cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1516cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1546cbff00fSChristoph Hellwig return -EACCES; 1556cbff00fSChristoph Hellwig 1566cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1596cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1606cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1616cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1626cbff00fSChristoph Hellwig ret = -EPERM; 1636cbff00fSChristoph Hellwig goto out_unlock; 1646cbff00fSChristoph Hellwig } 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 1676cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1686cbff00fSChristoph Hellwig if (ret) 1696cbff00fSChristoph Hellwig goto out_unlock; 1706cbff00fSChristoph Hellwig 1716cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1726cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1736cbff00fSChristoph Hellwig else 1746cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1756cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1766cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1776cbff00fSChristoph Hellwig else 1786cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1796cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1806cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1816cbff00fSChristoph Hellwig else 1826cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1836cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1846cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1856cbff00fSChristoph Hellwig else 1866cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1876cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1886cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1896cbff00fSChristoph Hellwig else 1906cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1916cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1926cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1936cbff00fSChristoph Hellwig else 1946cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 1956cbff00fSChristoph Hellwig 1966cbff00fSChristoph Hellwig 1976cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 1986cbff00fSChristoph Hellwig BUG_ON(!trans); 1996cbff00fSChristoph Hellwig 2006cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2016cbff00fSChristoph Hellwig BUG_ON(ret); 2026cbff00fSChristoph Hellwig 2036cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2046cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2056cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2066cbff00fSChristoph Hellwig 2076cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2086cbff00fSChristoph Hellwig out_unlock: 2096cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2106cbff00fSChristoph Hellwig return 0; 2116cbff00fSChristoph Hellwig } 2126cbff00fSChristoph Hellwig 2136cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2146cbff00fSChristoph Hellwig { 2156cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2166cbff00fSChristoph Hellwig 2176cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2186cbff00fSChristoph Hellwig } 219f46b5a66SChristoph Hellwig 220cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 221cb8e7090SChristoph Hellwig struct dentry *dentry, 222cb8e7090SChristoph Hellwig char *name, int namelen) 223f46b5a66SChristoph Hellwig { 224f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 225f46b5a66SChristoph Hellwig struct btrfs_key key; 226f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 227f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 228f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 229f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 230f46b5a66SChristoph Hellwig struct inode *dir; 231f46b5a66SChristoph Hellwig int ret; 232f46b5a66SChristoph Hellwig int err; 233f46b5a66SChristoph Hellwig u64 objectid; 234f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2353de4586cSChris Mason u64 index = 0; 236f46b5a66SChristoph Hellwig unsigned long nr = 1; 237f46b5a66SChristoph Hellwig 2386a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 239f46b5a66SChristoph Hellwig if (ret) 240f46b5a66SChristoph Hellwig goto fail_commit; 241f46b5a66SChristoph Hellwig 242f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 243f46b5a66SChristoph Hellwig BUG_ON(!trans); 244f46b5a66SChristoph Hellwig 245f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 246f46b5a66SChristoph Hellwig 0, &objectid); 247f46b5a66SChristoph Hellwig if (ret) 248f46b5a66SChristoph Hellwig goto fail; 249f46b5a66SChristoph Hellwig 2505d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2515d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2528e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2538e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2548e8a1e31SJosef Bacik goto fail; 2558e8a1e31SJosef Bacik } 256f46b5a66SChristoph Hellwig 2575d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 258f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 259f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2605d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 261f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 262f46b5a66SChristoph Hellwig 263f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 264f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 265f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2665d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2675d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2685d4f98a2SYan Zheng BTRFS_UUID_SIZE); 269f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 270f46b5a66SChristoph Hellwig 271f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 272f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 273f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 274f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 275f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 276a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 277f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 278f46b5a66SChristoph Hellwig 279f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 281f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 282f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 283f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 28480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 285f46b5a66SChristoph Hellwig 286f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 287f46b5a66SChristoph Hellwig root_item.drop_level = 0; 288f46b5a66SChristoph Hellwig 289925baeddSChris Mason btrfs_tree_unlock(leaf); 290f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 291f46b5a66SChristoph Hellwig leaf = NULL; 292f46b5a66SChristoph Hellwig 293f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 294f46b5a66SChristoph Hellwig 295f46b5a66SChristoph Hellwig key.objectid = objectid; 2965d4f98a2SYan Zheng key.offset = 0; 297f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 298f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 299f46b5a66SChristoph Hellwig &root_item); 300f46b5a66SChristoph Hellwig if (ret) 301f46b5a66SChristoph Hellwig goto fail; 302f46b5a66SChristoph Hellwig 303f46b5a66SChristoph Hellwig /* 304f46b5a66SChristoph Hellwig * insert the directory item 305f46b5a66SChristoph Hellwig */ 306f46b5a66SChristoph Hellwig key.offset = (u64)-1; 3073de4586cSChris Mason dir = dentry->d_parent->d_inode; 3083de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3093de4586cSChris Mason BUG_ON(ret); 3103de4586cSChris Mason 3113de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 312f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3133de4586cSChris Mason BTRFS_FT_DIR, index); 314f46b5a66SChristoph Hellwig if (ret) 315f46b5a66SChristoph Hellwig goto fail; 3160660b5afSChris Mason 31752c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 31852c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 31952c26179SYan Zheng BUG_ON(ret); 32052c26179SYan Zheng 3210660b5afSChris Mason /* add the backref first */ 3220660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3230660b5afSChris Mason objectid, BTRFS_ROOT_BACKREF_KEY, 3240660b5afSChris Mason root->root_key.objectid, 3250660b5afSChris Mason dir->i_ino, index, name, namelen); 3260660b5afSChris Mason 3270660b5afSChris Mason BUG_ON(ret); 3280660b5afSChris Mason 3290660b5afSChris Mason /* now add the forward ref */ 3300660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3310660b5afSChris Mason root->root_key.objectid, BTRFS_ROOT_REF_KEY, 3320660b5afSChris Mason objectid, 3330660b5afSChris Mason dir->i_ino, index, name, namelen); 3340660b5afSChris Mason 3350660b5afSChris Mason BUG_ON(ret); 3360660b5afSChris Mason 337f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 338f46b5a66SChristoph Hellwig if (ret) 339f46b5a66SChristoph Hellwig goto fail_commit; 340f46b5a66SChristoph Hellwig 3413de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 342f46b5a66SChristoph Hellwig BUG_ON(!new_root); 343f46b5a66SChristoph Hellwig 344f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 345f46b5a66SChristoph Hellwig BUG_ON(!trans); 346f46b5a66SChristoph Hellwig 347d2fb3437SYan Zheng ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, 348f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 349f46b5a66SChristoph Hellwig if (ret) 350f46b5a66SChristoph Hellwig goto fail; 351f46b5a66SChristoph Hellwig 352f46b5a66SChristoph Hellwig fail: 353f46b5a66SChristoph Hellwig nr = trans->blocks_used; 354f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 355f46b5a66SChristoph Hellwig if (err && !ret) 356f46b5a66SChristoph Hellwig ret = err; 357f46b5a66SChristoph Hellwig fail_commit: 358f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 359f46b5a66SChristoph Hellwig return ret; 360f46b5a66SChristoph Hellwig } 361f46b5a66SChristoph Hellwig 3623de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3633de4586cSChris Mason char *name, int namelen) 364f46b5a66SChristoph Hellwig { 365f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 366f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3673de4586cSChris Mason int ret = 0; 368f46b5a66SChristoph Hellwig int err; 369f46b5a66SChristoph Hellwig unsigned long nr = 0; 370f46b5a66SChristoph Hellwig 371f46b5a66SChristoph Hellwig if (!root->ref_cows) 372f46b5a66SChristoph Hellwig return -EINVAL; 373f46b5a66SChristoph Hellwig 3746a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 375f46b5a66SChristoph Hellwig if (ret) 376f46b5a66SChristoph Hellwig goto fail_unlock; 377f46b5a66SChristoph Hellwig 3783de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 379f46b5a66SChristoph Hellwig if (!pending_snapshot) { 380f46b5a66SChristoph Hellwig ret = -ENOMEM; 381f46b5a66SChristoph Hellwig goto fail_unlock; 382f46b5a66SChristoph Hellwig } 383f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 384f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 385f46b5a66SChristoph Hellwig ret = -ENOMEM; 386f46b5a66SChristoph Hellwig kfree(pending_snapshot); 387f46b5a66SChristoph Hellwig goto fail_unlock; 388f46b5a66SChristoph Hellwig } 389f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 390f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3913de4586cSChris Mason pending_snapshot->dentry = dentry; 392f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 393f46b5a66SChristoph Hellwig BUG_ON(!trans); 394f46b5a66SChristoph Hellwig pending_snapshot->root = root; 395f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 396f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 397f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 398f46b5a66SChristoph Hellwig 399f46b5a66SChristoph Hellwig fail_unlock: 400f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 401f46b5a66SChristoph Hellwig return ret; 402f46b5a66SChristoph Hellwig } 403f46b5a66SChristoph Hellwig 404cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 405cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 406cb8e7090SChristoph Hellwig { 407cb8e7090SChristoph Hellwig if (child->d_inode) 408cb8e7090SChristoph Hellwig return -EEXIST; 409cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 410cb8e7090SChristoph Hellwig return -ENOENT; 411cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 412cb8e7090SChristoph Hellwig } 413cb8e7090SChristoph Hellwig 414cb8e7090SChristoph Hellwig /* 415cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 416cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 417cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 418cb8e7090SChristoph Hellwig */ 419cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 4203de4586cSChris Mason int mode, int namelen, 4213de4586cSChris Mason struct btrfs_root *snap_src) 422cb8e7090SChristoph Hellwig { 423cb8e7090SChristoph Hellwig struct dentry *dentry; 424cb8e7090SChristoph Hellwig int error; 425cb8e7090SChristoph Hellwig 426cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 427cb8e7090SChristoph Hellwig 428cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 429cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 430cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 431cb8e7090SChristoph Hellwig goto out_unlock; 432cb8e7090SChristoph Hellwig 433cb8e7090SChristoph Hellwig error = -EEXIST; 434cb8e7090SChristoph Hellwig if (dentry->d_inode) 435cb8e7090SChristoph Hellwig goto out_dput; 436cb8e7090SChristoph Hellwig 437cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 438ce3b0f8dSAl Viro mode &= ~current_umask(); 4393de4586cSChris Mason 440cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 441cb8e7090SChristoph Hellwig if (error) 442cb8e7090SChristoph Hellwig goto out_dput; 443cb8e7090SChristoph Hellwig 444cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 445cb8e7090SChristoph Hellwig if (error) 446cb8e7090SChristoph Hellwig goto out_drop_write; 447cb8e7090SChristoph Hellwig 448cb8e7090SChristoph Hellwig /* 449cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 450cb8e7090SChristoph Hellwig * this VFS fuzz. 451cb8e7090SChristoph Hellwig * 452cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 453cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 454cb8e7090SChristoph Hellwig * 455cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 456cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 457cb8e7090SChristoph Hellwig */ 4583de4586cSChris Mason if (snap_src) { 459ea9e8b11SChris Mason struct dentry *dir = dentry->d_parent; 460ea9e8b11SChris Mason struct dentry *test = dir->d_parent; 461ea9e8b11SChris Mason struct btrfs_path *path = btrfs_alloc_path(); 462ea9e8b11SChris Mason int ret; 463ea9e8b11SChris Mason u64 test_oid; 464ea9e8b11SChris Mason u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; 465ea9e8b11SChris Mason 466ea9e8b11SChris Mason test_oid = snap_src->root_key.objectid; 467ea9e8b11SChris Mason 468ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 469ea9e8b11SChris Mason path, parent_oid, test_oid); 470ea9e8b11SChris Mason if (ret == 0) 471ea9e8b11SChris Mason goto create; 472ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 473ea9e8b11SChris Mason 474ea9e8b11SChris Mason /* we need to make sure we aren't creating a directory loop 475ea9e8b11SChris Mason * by taking a snapshot of something that has our current 476ea9e8b11SChris Mason * subvol in its directory tree. So, this loops through 477ea9e8b11SChris Mason * the dentries and checks the forward refs for each subvolume 478ea9e8b11SChris Mason * to see if is references the subvolume where we are 479ea9e8b11SChris Mason * placing this new snapshot. 480ea9e8b11SChris Mason */ 481ea9e8b11SChris Mason while (1) { 482ea9e8b11SChris Mason if (!test || 483ea9e8b11SChris Mason dir == snap_src->fs_info->sb->s_root || 484ea9e8b11SChris Mason test == snap_src->fs_info->sb->s_root || 485ea9e8b11SChris Mason test->d_inode->i_sb != snap_src->fs_info->sb) { 486ea9e8b11SChris Mason break; 487ea9e8b11SChris Mason } 488ea9e8b11SChris Mason if (S_ISLNK(test->d_inode->i_mode)) { 489d397712bSChris Mason printk(KERN_INFO "Btrfs symlink in snapshot " 490d397712bSChris Mason "path, failed\n"); 491ea9e8b11SChris Mason error = -EMLINK; 492ea9e8b11SChris Mason btrfs_free_path(path); 493ea9e8b11SChris Mason goto out_drop_write; 494ea9e8b11SChris Mason } 495ea9e8b11SChris Mason test_oid = 496ea9e8b11SChris Mason BTRFS_I(test->d_inode)->root->root_key.objectid; 497ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 498ea9e8b11SChris Mason path, test_oid, parent_oid); 499ea9e8b11SChris Mason if (ret == 0) { 500d397712bSChris Mason printk(KERN_INFO "Btrfs snapshot creation " 501d397712bSChris Mason "failed, looping\n"); 502ea9e8b11SChris Mason error = -EMLINK; 503ea9e8b11SChris Mason btrfs_free_path(path); 504ea9e8b11SChris Mason goto out_drop_write; 505ea9e8b11SChris Mason } 506ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 507ea9e8b11SChris Mason test = test->d_parent; 508ea9e8b11SChris Mason } 509ea9e8b11SChris Mason create: 510ea9e8b11SChris Mason btrfs_free_path(path); 5113de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 5123de4586cSChris Mason } else { 5133de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 5143de4586cSChris Mason dentry, name, namelen); 5153de4586cSChris Mason } 516cb8e7090SChristoph Hellwig if (error) 517cb8e7090SChristoph Hellwig goto out_drop_write; 518cb8e7090SChristoph Hellwig 519cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 520cb8e7090SChristoph Hellwig out_drop_write: 521cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 522cb8e7090SChristoph Hellwig out_dput: 523cb8e7090SChristoph Hellwig dput(dentry); 524cb8e7090SChristoph Hellwig out_unlock: 525cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 526cb8e7090SChristoph Hellwig return error; 527cb8e7090SChristoph Hellwig } 528cb8e7090SChristoph Hellwig 529cb8e7090SChristoph Hellwig 530b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 531f46b5a66SChristoph Hellwig { 532f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 533f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 534f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5353eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 536f46b5a66SChristoph Hellwig struct page *page; 537f46b5a66SChristoph Hellwig unsigned long last_index; 538f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 539f46b5a66SChristoph Hellwig unsigned long total_read = 0; 540f46b5a66SChristoph Hellwig u64 page_start; 541f46b5a66SChristoph Hellwig u64 page_end; 542f46b5a66SChristoph Hellwig unsigned long i; 543f46b5a66SChristoph Hellwig int ret; 544f46b5a66SChristoph Hellwig 5456a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 546f46b5a66SChristoph Hellwig if (ret) 547f46b5a66SChristoph Hellwig return -ENOSPC; 548f46b5a66SChristoph Hellwig 549f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 550f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 551f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 552f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 553f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 554f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 555f46b5a66SChristoph Hellwig } 556f46b5a66SChristoph Hellwig total_read++; 5573eaa2885SChris Mason again: 558f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 559f46b5a66SChristoph Hellwig if (!page) 560f46b5a66SChristoph Hellwig goto out_unlock; 561f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 562f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 563f46b5a66SChristoph Hellwig lock_page(page); 564f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 565f46b5a66SChristoph Hellwig unlock_page(page); 566f46b5a66SChristoph Hellwig page_cache_release(page); 567f46b5a66SChristoph Hellwig goto out_unlock; 568f46b5a66SChristoph Hellwig } 569f46b5a66SChristoph Hellwig } 570f46b5a66SChristoph Hellwig 571f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 572f46b5a66SChristoph Hellwig 573f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 574f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 575f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 5763eaa2885SChris Mason 5773eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 5783eaa2885SChris Mason if (ordered) { 5793eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 5803eaa2885SChris Mason unlock_page(page); 5813eaa2885SChris Mason page_cache_release(page); 5823eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 5833eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 5843eaa2885SChris Mason goto again; 5853eaa2885SChris Mason } 5863eaa2885SChris Mason set_page_extent_mapped(page); 5873eaa2885SChris Mason 588f87f057bSChris Mason /* 589f87f057bSChris Mason * this makes sure page_mkwrite is called on the 590f87f057bSChris Mason * page if it is dirtied again later 591f87f057bSChris Mason */ 592f87f057bSChris Mason clear_page_dirty_for_io(page); 593f87f057bSChris Mason 594ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 595f46b5a66SChristoph Hellwig 596f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 597f46b5a66SChristoph Hellwig set_page_dirty(page); 598f46b5a66SChristoph Hellwig unlock_page(page); 599f46b5a66SChristoph Hellwig page_cache_release(page); 600f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 601f46b5a66SChristoph Hellwig } 602f46b5a66SChristoph Hellwig 603f46b5a66SChristoph Hellwig out_unlock: 604f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 605f46b5a66SChristoph Hellwig return 0; 606f46b5a66SChristoph Hellwig } 607f46b5a66SChristoph Hellwig 608f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 609f46b5a66SChristoph Hellwig { 610f46b5a66SChristoph Hellwig u64 new_size; 611f46b5a66SChristoph Hellwig u64 old_size; 612f46b5a66SChristoph Hellwig u64 devid = 1; 613f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 614f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 615f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 616f46b5a66SChristoph Hellwig char *sizestr; 617f46b5a66SChristoph Hellwig char *devstr = NULL; 618f46b5a66SChristoph Hellwig int ret = 0; 619f46b5a66SChristoph Hellwig int namelen; 620f46b5a66SChristoph Hellwig int mod = 0; 621f46b5a66SChristoph Hellwig 622c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 623c146afadSYan Zheng return -EROFS; 624c146afadSYan Zheng 625e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 626e441d54dSChris Mason return -EPERM; 627e441d54dSChris Mason 628dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 629dae7b665SLi Zefan if (IS_ERR(vol_args)) 630dae7b665SLi Zefan return PTR_ERR(vol_args); 6315516e595SMark Fasheh 6325516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 633f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 634f46b5a66SChristoph Hellwig 6357d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 636f46b5a66SChristoph Hellwig sizestr = vol_args->name; 637f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 638f46b5a66SChristoph Hellwig if (devstr) { 639f46b5a66SChristoph Hellwig char *end; 640f46b5a66SChristoph Hellwig sizestr = devstr + 1; 641f46b5a66SChristoph Hellwig *devstr = '\0'; 642f46b5a66SChristoph Hellwig devstr = vol_args->name; 643f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 64421380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 64521380931SJoel Becker (unsigned long long)devid); 646f46b5a66SChristoph Hellwig } 6472b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 648f46b5a66SChristoph Hellwig if (!device) { 64921380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 65021380931SJoel Becker (unsigned long long)devid); 651f46b5a66SChristoph Hellwig ret = -EINVAL; 652f46b5a66SChristoph Hellwig goto out_unlock; 653f46b5a66SChristoph Hellwig } 654f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 655f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 656f46b5a66SChristoph Hellwig else { 657f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 658f46b5a66SChristoph Hellwig mod = -1; 659f46b5a66SChristoph Hellwig sizestr++; 660f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 661f46b5a66SChristoph Hellwig mod = 1; 662f46b5a66SChristoph Hellwig sizestr++; 663f46b5a66SChristoph Hellwig } 664f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 665f46b5a66SChristoph Hellwig if (new_size == 0) { 666f46b5a66SChristoph Hellwig ret = -EINVAL; 667f46b5a66SChristoph Hellwig goto out_unlock; 668f46b5a66SChristoph Hellwig } 669f46b5a66SChristoph Hellwig } 670f46b5a66SChristoph Hellwig 671f46b5a66SChristoph Hellwig old_size = device->total_bytes; 672f46b5a66SChristoph Hellwig 673f46b5a66SChristoph Hellwig if (mod < 0) { 674f46b5a66SChristoph Hellwig if (new_size > old_size) { 675f46b5a66SChristoph Hellwig ret = -EINVAL; 676f46b5a66SChristoph Hellwig goto out_unlock; 677f46b5a66SChristoph Hellwig } 678f46b5a66SChristoph Hellwig new_size = old_size - new_size; 679f46b5a66SChristoph Hellwig } else if (mod > 0) { 680f46b5a66SChristoph Hellwig new_size = old_size + new_size; 681f46b5a66SChristoph Hellwig } 682f46b5a66SChristoph Hellwig 683f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 684f46b5a66SChristoph Hellwig ret = -EINVAL; 685f46b5a66SChristoph Hellwig goto out_unlock; 686f46b5a66SChristoph Hellwig } 687f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 688f46b5a66SChristoph Hellwig ret = -EFBIG; 689f46b5a66SChristoph Hellwig goto out_unlock; 690f46b5a66SChristoph Hellwig } 691f46b5a66SChristoph Hellwig 692f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 693f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 694f46b5a66SChristoph Hellwig 695f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 696f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 697f46b5a66SChristoph Hellwig 698f46b5a66SChristoph Hellwig if (new_size > old_size) { 699f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 700f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 701f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 702f46b5a66SChristoph Hellwig } else { 703f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 704f46b5a66SChristoph Hellwig } 705f46b5a66SChristoph Hellwig 706f46b5a66SChristoph Hellwig out_unlock: 7077d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 708f46b5a66SChristoph Hellwig kfree(vol_args); 709f46b5a66SChristoph Hellwig return ret; 710f46b5a66SChristoph Hellwig } 711f46b5a66SChristoph Hellwig 712cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 7133de4586cSChris Mason void __user *arg, int subvol) 714f46b5a66SChristoph Hellwig { 715cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 716f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 717f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 718f46b5a66SChristoph Hellwig struct btrfs_path *path; 7193de4586cSChris Mason struct file *src_file; 720f46b5a66SChristoph Hellwig u64 root_dirid; 721f46b5a66SChristoph Hellwig int namelen; 7223de4586cSChris Mason int ret = 0; 723f46b5a66SChristoph Hellwig 724c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 725c146afadSYan Zheng return -EROFS; 726c146afadSYan Zheng 727dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 728dae7b665SLi Zefan if (IS_ERR(vol_args)) 729dae7b665SLi Zefan return PTR_ERR(vol_args); 730f46b5a66SChristoph Hellwig 7315516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 732f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 733f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 734f46b5a66SChristoph Hellwig ret = -EINVAL; 735f46b5a66SChristoph Hellwig goto out; 736f46b5a66SChristoph Hellwig } 737f46b5a66SChristoph Hellwig 738f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 739f46b5a66SChristoph Hellwig if (!path) { 740f46b5a66SChristoph Hellwig ret = -ENOMEM; 741f46b5a66SChristoph Hellwig goto out; 742f46b5a66SChristoph Hellwig } 743f46b5a66SChristoph Hellwig 744f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 745f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 746f46b5a66SChristoph Hellwig path, root_dirid, 747f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 748f46b5a66SChristoph Hellwig btrfs_free_path(path); 749f46b5a66SChristoph Hellwig 750f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 751f46b5a66SChristoph Hellwig ret = -EEXIST; 752f46b5a66SChristoph Hellwig goto out; 753f46b5a66SChristoph Hellwig } 754f46b5a66SChristoph Hellwig 755f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 756f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 757f46b5a66SChristoph Hellwig goto out; 758f46b5a66SChristoph Hellwig } 759f46b5a66SChristoph Hellwig 7603de4586cSChris Mason if (subvol) { 761cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 762cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 7633de4586cSChris Mason namelen, NULL); 764cb8e7090SChristoph Hellwig } else { 7653de4586cSChris Mason struct inode *src_inode; 7663de4586cSChris Mason src_file = fget(vol_args->fd); 7673de4586cSChris Mason if (!src_file) { 7683de4586cSChris Mason ret = -EINVAL; 7693de4586cSChris Mason goto out; 7703de4586cSChris Mason } 7713de4586cSChris Mason 7723de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 7733de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 774d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 775d397712bSChris Mason "another FS\n"); 7763de4586cSChris Mason ret = -EINVAL; 7773de4586cSChris Mason fput(src_file); 7783de4586cSChris Mason goto out; 7793de4586cSChris Mason } 7803de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 7813de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 7823de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 7833de4586cSChris Mason fput(src_file); 784cb8e7090SChristoph Hellwig } 785cb8e7090SChristoph Hellwig 786f46b5a66SChristoph Hellwig out: 787f46b5a66SChristoph Hellwig kfree(vol_args); 788f46b5a66SChristoph Hellwig return ret; 789f46b5a66SChristoph Hellwig } 790f46b5a66SChristoph Hellwig 791f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 792f46b5a66SChristoph Hellwig { 793f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 794f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 795c146afadSYan Zheng int ret; 796c146afadSYan Zheng 797c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 798c146afadSYan Zheng if (ret) 799c146afadSYan Zheng return ret; 800f46b5a66SChristoph Hellwig 801f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 802f46b5a66SChristoph Hellwig case S_IFDIR: 803e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 804e441d54dSChris Mason ret = -EPERM; 805e441d54dSChris Mason goto out; 806e441d54dSChris Mason } 807f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 808f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 809f46b5a66SChristoph Hellwig break; 810f46b5a66SChristoph Hellwig case S_IFREG: 811e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 812e441d54dSChris Mason ret = -EINVAL; 813e441d54dSChris Mason goto out; 814e441d54dSChris Mason } 815f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 816f46b5a66SChristoph Hellwig break; 817f46b5a66SChristoph Hellwig } 818e441d54dSChris Mason out: 819ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 820e441d54dSChris Mason return ret; 821f46b5a66SChristoph Hellwig } 822f46b5a66SChristoph Hellwig 823b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 824f46b5a66SChristoph Hellwig { 825f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 826f46b5a66SChristoph Hellwig int ret; 827f46b5a66SChristoph Hellwig 828e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 829e441d54dSChris Mason return -EPERM; 830e441d54dSChris Mason 831dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 832dae7b665SLi Zefan if (IS_ERR(vol_args)) 833dae7b665SLi Zefan return PTR_ERR(vol_args); 834f46b5a66SChristoph Hellwig 8355516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 836f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 837f46b5a66SChristoph Hellwig 838f46b5a66SChristoph Hellwig kfree(vol_args); 839f46b5a66SChristoph Hellwig return ret; 840f46b5a66SChristoph Hellwig } 841f46b5a66SChristoph Hellwig 842b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 843f46b5a66SChristoph Hellwig { 844f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 845f46b5a66SChristoph Hellwig int ret; 846f46b5a66SChristoph Hellwig 847e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 848e441d54dSChris Mason return -EPERM; 849e441d54dSChris Mason 850c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 851c146afadSYan Zheng return -EROFS; 852c146afadSYan Zheng 853dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 854dae7b665SLi Zefan if (IS_ERR(vol_args)) 855dae7b665SLi Zefan return PTR_ERR(vol_args); 856f46b5a66SChristoph Hellwig 8575516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 858f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 859f46b5a66SChristoph Hellwig 860f46b5a66SChristoph Hellwig kfree(vol_args); 861f46b5a66SChristoph Hellwig return ret; 862f46b5a66SChristoph Hellwig } 863f46b5a66SChristoph Hellwig 864b2950863SChristoph Hellwig static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 865b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 866f46b5a66SChristoph Hellwig { 867f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 868f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 869f46b5a66SChristoph Hellwig struct file *src_file; 870f46b5a66SChristoph Hellwig struct inode *src; 871f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 872f46b5a66SChristoph Hellwig struct btrfs_path *path; 873f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 874ae01a0abSYan Zheng char *buf; 875ae01a0abSYan Zheng struct btrfs_key key; 876f46b5a66SChristoph Hellwig u32 nritems; 877f46b5a66SChristoph Hellwig int slot; 878ae01a0abSYan Zheng int ret; 879c5c9cd4dSSage Weil u64 len = olen; 880c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 881c5c9cd4dSSage Weil u64 hint_byte; 882d20f7043SChris Mason 883c5c9cd4dSSage Weil /* 884c5c9cd4dSSage Weil * TODO: 885c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 886c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 887c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 888c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 889c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 890c5c9cd4dSSage Weil * they don't overlap)? 891c5c9cd4dSSage Weil */ 892c5c9cd4dSSage Weil 893e441d54dSChris Mason /* the destination must be opened for writing */ 894e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 895e441d54dSChris Mason return -EINVAL; 896e441d54dSChris Mason 897c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 898c146afadSYan Zheng if (ret) 899c146afadSYan Zheng return ret; 900c146afadSYan Zheng 901c5c9cd4dSSage Weil src_file = fget(srcfd); 902ab67b7c1SYan Zheng if (!src_file) { 903ab67b7c1SYan Zheng ret = -EBADF; 904ab67b7c1SYan Zheng goto out_drop_write; 905ab67b7c1SYan Zheng } 906f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 907f46b5a66SChristoph Hellwig 908c5c9cd4dSSage Weil ret = -EINVAL; 909c5c9cd4dSSage Weil if (src == inode) 910c5c9cd4dSSage Weil goto out_fput; 911c5c9cd4dSSage Weil 912ae01a0abSYan Zheng ret = -EISDIR; 913ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 914f46b5a66SChristoph Hellwig goto out_fput; 915f46b5a66SChristoph Hellwig 916ae01a0abSYan Zheng ret = -EXDEV; 917ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 918ae01a0abSYan Zheng goto out_fput; 919ae01a0abSYan Zheng 920ae01a0abSYan Zheng ret = -ENOMEM; 921ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 922ae01a0abSYan Zheng if (!buf) 923ae01a0abSYan Zheng goto out_fput; 924ae01a0abSYan Zheng 925ae01a0abSYan Zheng path = btrfs_alloc_path(); 926ae01a0abSYan Zheng if (!path) { 927ae01a0abSYan Zheng vfree(buf); 928ae01a0abSYan Zheng goto out_fput; 929ae01a0abSYan Zheng } 930ae01a0abSYan Zheng path->reada = 2; 931ae01a0abSYan Zheng 932f46b5a66SChristoph Hellwig if (inode < src) { 933f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 934f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 935f46b5a66SChristoph Hellwig } else { 936f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 937f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 938f46b5a66SChristoph Hellwig } 939f46b5a66SChristoph Hellwig 940c5c9cd4dSSage Weil /* determine range to clone */ 941c5c9cd4dSSage Weil ret = -EINVAL; 942c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 943f46b5a66SChristoph Hellwig goto out_unlock; 944c5c9cd4dSSage Weil if (len == 0) 945c5c9cd4dSSage Weil olen = len = src->i_size - off; 946c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 947c5c9cd4dSSage Weil if (off + len == src->i_size) 948c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 949c5c9cd4dSSage Weil - off; 950c5c9cd4dSSage Weil 951c5c9cd4dSSage Weil /* verify the end result is block aligned */ 952c5c9cd4dSSage Weil if ((off & (bs-1)) || 953c5c9cd4dSSage Weil ((off + len) & (bs-1))) 954c5c9cd4dSSage Weil goto out_unlock; 955c5c9cd4dSSage Weil 956f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 957f46b5a66SChristoph Hellwig another, and lock file content */ 958f46b5a66SChristoph Hellwig while (1) { 95931840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 960c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 961c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 962ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 963f46b5a66SChristoph Hellwig break; 964c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 965ae01a0abSYan Zheng if (ordered) 966ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 967c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 968f46b5a66SChristoph Hellwig } 969f46b5a66SChristoph Hellwig 970ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 971ae01a0abSYan Zheng BUG_ON(!trans); 972ae01a0abSYan Zheng 973c5c9cd4dSSage Weil /* punch hole in destination first */ 974e980b50cSChris Mason btrfs_drop_extents(trans, root, inode, off, off + len, 975e980b50cSChris Mason off + len, 0, &hint_byte); 976c5c9cd4dSSage Weil 977c5c9cd4dSSage Weil /* clone data */ 978f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 979ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 980ae01a0abSYan Zheng key.offset = 0; 981f46b5a66SChristoph Hellwig 982f46b5a66SChristoph Hellwig while (1) { 983f46b5a66SChristoph Hellwig /* 984f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 985f46b5a66SChristoph Hellwig * tree. 986f46b5a66SChristoph Hellwig */ 987f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 988f46b5a66SChristoph Hellwig if (ret < 0) 989f46b5a66SChristoph Hellwig goto out; 990f46b5a66SChristoph Hellwig 991ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 992ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 993f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 994f46b5a66SChristoph Hellwig if (ret < 0) 995f46b5a66SChristoph Hellwig goto out; 996f46b5a66SChristoph Hellwig if (ret > 0) 997f46b5a66SChristoph Hellwig break; 998ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 999f46b5a66SChristoph Hellwig } 1000f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1001f46b5a66SChristoph Hellwig slot = path->slots[0]; 1002f46b5a66SChristoph Hellwig 1003ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1004d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1005f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1006f46b5a66SChristoph Hellwig break; 1007f46b5a66SChristoph Hellwig 1008c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1009c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1010c5c9cd4dSSage Weil int type; 101131840ae1SZheng Yan u32 size; 101231840ae1SZheng Yan struct btrfs_key new_key; 1013c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1014c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1015c5c9cd4dSSage Weil u8 comp; 101631840ae1SZheng Yan 101731840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 101831840ae1SZheng Yan read_extent_buffer(leaf, buf, 101931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 102031840ae1SZheng Yan size); 1021c5c9cd4dSSage Weil 1022c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1023c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1024c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1025c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1026c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 1027d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1028d397712bSChris Mason extent); 1029d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1030d397712bSChris Mason extent); 1031c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1032d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1033d397712bSChris Mason extent); 1034c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1035c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1036c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1037c5c9cd4dSSage Weil extent); 1038c5c9cd4dSSage Weil } 103931840ae1SZheng Yan btrfs_release_path(root, path); 104031840ae1SZheng Yan 1041c5c9cd4dSSage Weil if (key.offset + datal < off || 1042c5c9cd4dSSage Weil key.offset >= off+len) 1043c5c9cd4dSSage Weil goto next; 1044c5c9cd4dSSage Weil 104531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 104631840ae1SZheng Yan new_key.objectid = inode->i_ino; 1047c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1048c5c9cd4dSSage Weil 1049c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 105031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 105131840ae1SZheng Yan &new_key, size); 105231840ae1SZheng Yan if (ret) 105331840ae1SZheng Yan goto out; 105431840ae1SZheng Yan 105531840ae1SZheng Yan leaf = path->nodes[0]; 105631840ae1SZheng Yan slot = path->slots[0]; 105731840ae1SZheng Yan write_extent_buffer(leaf, buf, 105831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 105931840ae1SZheng Yan size); 1060ae01a0abSYan Zheng 1061f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1062f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1063c5c9cd4dSSage Weil 1064c5c9cd4dSSage Weil if (off > key.offset) { 1065c5c9cd4dSSage Weil datao += off - key.offset; 1066c5c9cd4dSSage Weil datal -= off - key.offset; 1067c5c9cd4dSSage Weil } 1068c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 1069c5c9cd4dSSage Weil off + len) 1070c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 1071c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1072c5c9cd4dSSage Weil if (!disko) 1073c5c9cd4dSSage Weil datao = 0; 1074c5c9cd4dSSage Weil 1075c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1076c5c9cd4dSSage Weil datao); 1077c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1078c5c9cd4dSSage Weil datal); 1079c5c9cd4dSSage Weil if (disko) { 1080c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1081ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 10825d4f98a2SYan Zheng disko, diskl, 0, 1083f46b5a66SChristoph Hellwig root->root_key.objectid, 10845d4f98a2SYan Zheng inode->i_ino, 10855d4f98a2SYan Zheng new_key.offset - datao); 1086ae01a0abSYan Zheng BUG_ON(ret); 1087f46b5a66SChristoph Hellwig } 1088c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1089c5c9cd4dSSage Weil u64 skip = 0; 1090c5c9cd4dSSage Weil u64 trim = 0; 1091c5c9cd4dSSage Weil if (off > key.offset) { 1092c5c9cd4dSSage Weil skip = off - key.offset; 1093c5c9cd4dSSage Weil new_key.offset += skip; 109431840ae1SZheng Yan } 1095d397712bSChris Mason 1096c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1097c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1098d397712bSChris Mason 1099c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1100c5c9cd4dSSage Weil ret = -EINVAL; 1101c5c9cd4dSSage Weil goto out; 110231840ae1SZheng Yan } 1103c5c9cd4dSSage Weil size -= skip + trim; 1104c5c9cd4dSSage Weil datal -= skip + trim; 1105c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1106c5c9cd4dSSage Weil &new_key, size); 1107c5c9cd4dSSage Weil if (ret) 1108c5c9cd4dSSage Weil goto out; 1109c5c9cd4dSSage Weil 1110c5c9cd4dSSage Weil if (skip) { 1111d397712bSChris Mason u32 start = 1112d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1113c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1114c5c9cd4dSSage Weil datal); 1115c5c9cd4dSSage Weil } 1116c5c9cd4dSSage Weil 1117c5c9cd4dSSage Weil leaf = path->nodes[0]; 1118c5c9cd4dSSage Weil slot = path->slots[0]; 1119c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1120c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1121c5c9cd4dSSage Weil size); 1122c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1123c5c9cd4dSSage Weil } 1124c5c9cd4dSSage Weil 1125c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1126c5c9cd4dSSage Weil } 1127c5c9cd4dSSage Weil 1128c5c9cd4dSSage Weil next: 112931840ae1SZheng Yan btrfs_release_path(root, path); 1130ae01a0abSYan Zheng key.offset++; 1131ae01a0abSYan Zheng } 1132f46b5a66SChristoph Hellwig ret = 0; 1133f46b5a66SChristoph Hellwig out: 1134ae01a0abSYan Zheng btrfs_release_path(root, path); 1135ae01a0abSYan Zheng if (ret == 0) { 1136ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1137c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1138c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1139ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1140ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1141ae01a0abSYan Zheng } 1142f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1143c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1144ae01a0abSYan Zheng if (ret) 1145ae01a0abSYan Zheng vmtruncate(inode, 0); 1146f46b5a66SChristoph Hellwig out_unlock: 1147f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1148f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1149ae01a0abSYan Zheng vfree(buf); 1150ae01a0abSYan Zheng btrfs_free_path(path); 1151f46b5a66SChristoph Hellwig out_fput: 1152f46b5a66SChristoph Hellwig fput(src_file); 1153ab67b7c1SYan Zheng out_drop_write: 1154ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1155f46b5a66SChristoph Hellwig return ret; 1156f46b5a66SChristoph Hellwig } 1157f46b5a66SChristoph Hellwig 11587a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1159c5c9cd4dSSage Weil { 1160c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1161c5c9cd4dSSage Weil 11627a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1163c5c9cd4dSSage Weil return -EFAULT; 1164c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1165c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1166c5c9cd4dSSage Weil } 1167c5c9cd4dSSage Weil 1168f46b5a66SChristoph Hellwig /* 1169f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1170f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1171f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1172f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1173f46b5a66SChristoph Hellwig */ 1174b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1175f46b5a66SChristoph Hellwig { 1176f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1177f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1178f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1179f46b5a66SChristoph Hellwig int ret = 0; 1180f46b5a66SChristoph Hellwig 1181df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1182df5b5520SChristoph Hellwig return -EPERM; 1183df5b5520SChristoph Hellwig 1184f46b5a66SChristoph Hellwig if (file->private_data) { 1185f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1186f46b5a66SChristoph Hellwig goto out; 1187f46b5a66SChristoph Hellwig } 11889ca9ee09SSage Weil 1189c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1190c146afadSYan Zheng if (ret) 1191c146afadSYan Zheng goto out; 1192c146afadSYan Zheng 11939ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 11949ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 11959ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 11969ca9ee09SSage Weil 11979ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1198f46b5a66SChristoph Hellwig if (trans) 1199f46b5a66SChristoph Hellwig file->private_data = trans; 1200f46b5a66SChristoph Hellwig else 1201f46b5a66SChristoph Hellwig ret = -ENOMEM; 1202f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1203f46b5a66SChristoph Hellwig out: 1204f46b5a66SChristoph Hellwig return ret; 1205f46b5a66SChristoph Hellwig } 1206f46b5a66SChristoph Hellwig 1207f46b5a66SChristoph Hellwig /* 1208f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1209f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1210f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1211f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1212f46b5a66SChristoph Hellwig */ 1213f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1214f46b5a66SChristoph Hellwig { 1215f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1216f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1217f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1218f46b5a66SChristoph Hellwig int ret = 0; 1219f46b5a66SChristoph Hellwig 1220f46b5a66SChristoph Hellwig trans = file->private_data; 1221f46b5a66SChristoph Hellwig if (!trans) { 1222f46b5a66SChristoph Hellwig ret = -EINVAL; 1223f46b5a66SChristoph Hellwig goto out; 1224f46b5a66SChristoph Hellwig } 1225f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1226b214107eSChristoph Hellwig file->private_data = NULL; 12279ca9ee09SSage Weil 12289ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12299ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 12309ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12319ca9ee09SSage Weil 1232cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 1233cfc8ea87SSage Weil 1234f46b5a66SChristoph Hellwig out: 1235f46b5a66SChristoph Hellwig return ret; 1236f46b5a66SChristoph Hellwig } 1237f46b5a66SChristoph Hellwig 1238f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1239f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1240f46b5a66SChristoph Hellwig { 1241f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 12424bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1243f46b5a66SChristoph Hellwig 1244f46b5a66SChristoph Hellwig switch (cmd) { 12456cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 12466cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 12476cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 12486cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 12496cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 12506cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1251f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 12524bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 12533de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 12544bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 1255f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1256f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1257f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 12584bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1259f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 12604bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1261f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 12624bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1263f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1264f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1265f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1266c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1267c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 12687a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1269f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1270f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1271f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1272f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1273f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1274f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1275f46b5a66SChristoph Hellwig return 0; 1276f46b5a66SChristoph Hellwig } 1277f46b5a66SChristoph Hellwig 1278f46b5a66SChristoph Hellwig return -ENOTTY; 1279f46b5a66SChristoph Hellwig } 1280