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> 424b4e25f2SChris Mason #include "compat.h" 43f46b5a66SChristoph Hellwig #include "ctree.h" 44f46b5a66SChristoph Hellwig #include "disk-io.h" 45f46b5a66SChristoph Hellwig #include "transaction.h" 46f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 47f46b5a66SChristoph Hellwig #include "ioctl.h" 48f46b5a66SChristoph Hellwig #include "print-tree.h" 49f46b5a66SChristoph Hellwig #include "volumes.h" 50925baeddSChris Mason #include "locking.h" 51f46b5a66SChristoph Hellwig 526cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 536cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 546cbff00fSChristoph Hellwig { 556cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 566cbff00fSChristoph Hellwig return flags; 576cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 586cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 596cbff00fSChristoph Hellwig else 606cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 616cbff00fSChristoph Hellwig } 62f46b5a66SChristoph Hellwig 636cbff00fSChristoph Hellwig /* 646cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 656cbff00fSChristoph Hellwig */ 666cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 676cbff00fSChristoph Hellwig { 686cbff00fSChristoph Hellwig unsigned int iflags = 0; 696cbff00fSChristoph Hellwig 706cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 716cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 726cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 736cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 756cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 776cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 796cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 816cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 826cbff00fSChristoph Hellwig 836cbff00fSChristoph Hellwig return iflags; 846cbff00fSChristoph Hellwig } 856cbff00fSChristoph Hellwig 866cbff00fSChristoph Hellwig /* 876cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 886cbff00fSChristoph Hellwig */ 896cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 906cbff00fSChristoph Hellwig { 916cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 926cbff00fSChristoph Hellwig 936cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 966cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 976cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 986cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 996cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1006cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1016cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1026cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1036cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1046cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1056cbff00fSChristoph Hellwig } 1066cbff00fSChristoph Hellwig 1076cbff00fSChristoph Hellwig /* 1086cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1096cbff00fSChristoph Hellwig * 1106cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1116cbff00fSChristoph Hellwig */ 1126cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1136cbff00fSChristoph Hellwig { 1140b4dcea5SChris Mason unsigned int flags; 1150b4dcea5SChris Mason 1160b4dcea5SChris Mason if (!dir) 1170b4dcea5SChris Mason return; 1180b4dcea5SChris Mason 1190b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1206cbff00fSChristoph Hellwig 1216cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1226cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1236cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1246cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1256cbff00fSChristoph Hellwig 1266cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1276cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1286cbff00fSChristoph Hellwig } 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1316cbff00fSChristoph Hellwig { 1326cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1336cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1346cbff00fSChristoph Hellwig 1356cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1366cbff00fSChristoph Hellwig return -EFAULT; 1376cbff00fSChristoph Hellwig return 0; 1386cbff00fSChristoph Hellwig } 1396cbff00fSChristoph Hellwig 1406cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1416cbff00fSChristoph Hellwig { 1426cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1436cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1446cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1456cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1466cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1476cbff00fSChristoph Hellwig int ret; 1486cbff00fSChristoph Hellwig 1496cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1506cbff00fSChristoph Hellwig return -EFAULT; 1516cbff00fSChristoph Hellwig 1526cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1536cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1546cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1556cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1586cbff00fSChristoph Hellwig return -EACCES; 1596cbff00fSChristoph Hellwig 1606cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1636cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1646cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1656cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1666cbff00fSChristoph Hellwig ret = -EPERM; 1676cbff00fSChristoph Hellwig goto out_unlock; 1686cbff00fSChristoph Hellwig } 1696cbff00fSChristoph Hellwig } 1706cbff00fSChristoph Hellwig 1716cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1726cbff00fSChristoph Hellwig if (ret) 1736cbff00fSChristoph Hellwig goto out_unlock; 1746cbff00fSChristoph Hellwig 1756cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1766cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1776cbff00fSChristoph Hellwig else 1786cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1796cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1806cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1816cbff00fSChristoph Hellwig else 1826cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1836cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1846cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1856cbff00fSChristoph Hellwig else 1866cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1876cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1886cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1896cbff00fSChristoph Hellwig else 1906cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1916cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1926cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1936cbff00fSChristoph Hellwig else 1946cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1956cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1966cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1976cbff00fSChristoph Hellwig else 1986cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 1996cbff00fSChristoph Hellwig 2006cbff00fSChristoph Hellwig 2016cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2026cbff00fSChristoph Hellwig BUG_ON(!trans); 2036cbff00fSChristoph Hellwig 2046cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2056cbff00fSChristoph Hellwig BUG_ON(ret); 2066cbff00fSChristoph Hellwig 2076cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2086cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2096cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2106cbff00fSChristoph Hellwig 2116cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2126cbff00fSChristoph Hellwig out_unlock: 2136cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2146cbff00fSChristoph Hellwig return 0; 2156cbff00fSChristoph Hellwig } 2166cbff00fSChristoph Hellwig 2176cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2186cbff00fSChristoph Hellwig { 2196cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2206cbff00fSChristoph Hellwig 2216cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2226cbff00fSChristoph Hellwig } 223f46b5a66SChristoph Hellwig 224cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 225cb8e7090SChristoph Hellwig struct dentry *dentry, 226cb8e7090SChristoph Hellwig char *name, int namelen) 227f46b5a66SChristoph Hellwig { 228f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 229f46b5a66SChristoph Hellwig struct btrfs_key key; 230f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 231f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 232f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23376dda93cSYan, Zheng struct btrfs_root *new_root; 23476dda93cSYan, Zheng struct inode *dir = dentry->d_parent->d_inode; 235f46b5a66SChristoph Hellwig int ret; 236f46b5a66SChristoph Hellwig int err; 237f46b5a66SChristoph Hellwig u64 objectid; 238f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2393de4586cSChris Mason u64 index = 0; 240f46b5a66SChristoph Hellwig unsigned long nr = 1; 241f46b5a66SChristoph Hellwig 2429ed74f2dSJosef Bacik /* 2439ed74f2dSJosef Bacik * 1 - inode item 2449ed74f2dSJosef Bacik * 2 - refs 2459ed74f2dSJosef Bacik * 1 - root item 2469ed74f2dSJosef Bacik * 2 - dir items 2479ed74f2dSJosef Bacik */ 2489ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 249f46b5a66SChristoph Hellwig if (ret) 25076dda93cSYan, Zheng return ret; 251f46b5a66SChristoph Hellwig 252f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 253f46b5a66SChristoph Hellwig BUG_ON(!trans); 254f46b5a66SChristoph Hellwig 255f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 256f46b5a66SChristoph Hellwig 0, &objectid); 257f46b5a66SChristoph Hellwig if (ret) 258f46b5a66SChristoph Hellwig goto fail; 259f46b5a66SChristoph Hellwig 2605d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2615d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2628e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2638e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2648e8a1e31SJosef Bacik goto fail; 2658e8a1e31SJosef Bacik } 266f46b5a66SChristoph Hellwig 2675d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 268f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 269f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2705d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 271f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 272f46b5a66SChristoph Hellwig 273f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 274f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 275f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2765d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2775d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2785d4f98a2SYan Zheng BTRFS_UUID_SIZE); 279f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 280f46b5a66SChristoph Hellwig 281f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 282f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 283f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 284f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 285f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 286a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 287f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 288f46b5a66SChristoph Hellwig 289f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 29084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 291f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 292f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 293f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 29480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 295f46b5a66SChristoph Hellwig 296f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 297f46b5a66SChristoph Hellwig root_item.drop_level = 0; 298f46b5a66SChristoph Hellwig 299925baeddSChris Mason btrfs_tree_unlock(leaf); 300f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 301f46b5a66SChristoph Hellwig leaf = NULL; 302f46b5a66SChristoph Hellwig 303f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 304f46b5a66SChristoph Hellwig 305f46b5a66SChristoph Hellwig key.objectid = objectid; 3065d4f98a2SYan Zheng key.offset = 0; 307f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 308f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 309f46b5a66SChristoph Hellwig &root_item); 310f46b5a66SChristoph Hellwig if (ret) 311f46b5a66SChristoph Hellwig goto fail; 312f46b5a66SChristoph Hellwig 31376dda93cSYan, Zheng key.offset = (u64)-1; 31476dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31576dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31676dda93cSYan, Zheng 31776dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31876dda93cSYan, Zheng 31976dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 32076dda93cSYan, Zheng BTRFS_I(dir)->block_group); 321f46b5a66SChristoph Hellwig /* 322f46b5a66SChristoph Hellwig * insert the directory item 323f46b5a66SChristoph Hellwig */ 3243de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3253de4586cSChris Mason BUG_ON(ret); 3263de4586cSChris Mason 3273de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 328f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3293de4586cSChris Mason BTRFS_FT_DIR, index); 330f46b5a66SChristoph Hellwig if (ret) 331f46b5a66SChristoph Hellwig goto fail; 3320660b5afSChris Mason 33352c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33552c26179SYan Zheng BUG_ON(ret); 33652c26179SYan Zheng 3370660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3384df27c4dSYan, Zheng objectid, root->root_key.objectid, 3390660b5afSChris Mason dir->i_ino, index, name, namelen); 34076dda93cSYan, Zheng 3410660b5afSChris Mason BUG_ON(ret); 3420660b5afSChris Mason 34376dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 344f46b5a66SChristoph Hellwig fail: 345f46b5a66SChristoph Hellwig nr = trans->blocks_used; 34676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 347f46b5a66SChristoph Hellwig if (err && !ret) 348f46b5a66SChristoph Hellwig ret = err; 3499ed74f2dSJosef Bacik 3509ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3519ed74f2dSJosef Bacik btrfs_btree_balance_dirty(root, nr); 352f46b5a66SChristoph Hellwig return ret; 353f46b5a66SChristoph Hellwig } 354f46b5a66SChristoph Hellwig 3553de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3563de4586cSChris Mason char *name, int namelen) 357f46b5a66SChristoph Hellwig { 358f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 359f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3603de4586cSChris Mason int ret = 0; 361f46b5a66SChristoph Hellwig int err; 362f46b5a66SChristoph Hellwig unsigned long nr = 0; 363f46b5a66SChristoph Hellwig 364f46b5a66SChristoph Hellwig if (!root->ref_cows) 365f46b5a66SChristoph Hellwig return -EINVAL; 366f46b5a66SChristoph Hellwig 3679ed74f2dSJosef Bacik /* 3689ed74f2dSJosef Bacik * 1 - inode item 3699ed74f2dSJosef Bacik * 2 - refs 3709ed74f2dSJosef Bacik * 1 - root item 3719ed74f2dSJosef Bacik * 2 - dir items 3729ed74f2dSJosef Bacik */ 3739ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 374f46b5a66SChristoph Hellwig if (ret) 375f46b5a66SChristoph Hellwig goto fail_unlock; 376f46b5a66SChristoph Hellwig 3773de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 378f46b5a66SChristoph Hellwig if (!pending_snapshot) { 379f46b5a66SChristoph Hellwig ret = -ENOMEM; 3809ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 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); 3879ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 388f46b5a66SChristoph Hellwig goto fail_unlock; 389f46b5a66SChristoph Hellwig } 390f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 391f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3923de4586cSChris Mason pending_snapshot->dentry = dentry; 393f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 394f46b5a66SChristoph Hellwig BUG_ON(!trans); 395f46b5a66SChristoph Hellwig pending_snapshot->root = root; 396f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 397f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 398f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 399f46b5a66SChristoph Hellwig 400f46b5a66SChristoph Hellwig fail_unlock: 401f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 402f46b5a66SChristoph Hellwig return ret; 403f46b5a66SChristoph Hellwig } 404f46b5a66SChristoph Hellwig 405cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 406cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 407cb8e7090SChristoph Hellwig { 408cb8e7090SChristoph Hellwig if (child->d_inode) 409cb8e7090SChristoph Hellwig return -EEXIST; 410cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 411cb8e7090SChristoph Hellwig return -ENOENT; 412cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 413cb8e7090SChristoph Hellwig } 414cb8e7090SChristoph Hellwig 415cb8e7090SChristoph Hellwig /* 416cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 417cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 418cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 419cb8e7090SChristoph Hellwig */ 42076dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 42176dda93cSYan, Zheng char *name, int namelen, 4223de4586cSChris Mason struct btrfs_root *snap_src) 423cb8e7090SChristoph Hellwig { 42476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 425cb8e7090SChristoph Hellwig struct dentry *dentry; 426cb8e7090SChristoph Hellwig int error; 427cb8e7090SChristoph Hellwig 42876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 429cb8e7090SChristoph Hellwig 430cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 431cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 432cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 433cb8e7090SChristoph Hellwig goto out_unlock; 434cb8e7090SChristoph Hellwig 435cb8e7090SChristoph Hellwig error = -EEXIST; 436cb8e7090SChristoph Hellwig if (dentry->d_inode) 437cb8e7090SChristoph Hellwig goto out_dput; 438cb8e7090SChristoph Hellwig 439cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 440cb8e7090SChristoph Hellwig if (error) 441cb8e7090SChristoph Hellwig goto out_dput; 442cb8e7090SChristoph Hellwig 44376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 444cb8e7090SChristoph Hellwig if (error) 445cb8e7090SChristoph Hellwig goto out_drop_write; 446cb8e7090SChristoph Hellwig 44776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 44876dda93cSYan, Zheng 44976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 45076dda93cSYan, Zheng goto out_up_read; 45176dda93cSYan, Zheng 4523de4586cSChris Mason if (snap_src) { 45376dda93cSYan, Zheng error = create_snapshot(snap_src, dentry, 45476dda93cSYan, Zheng name, namelen); 4553de4586cSChris Mason } else { 45676dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 45776dda93cSYan, Zheng name, namelen); 4583de4586cSChris Mason } 45976dda93cSYan, Zheng if (!error) 46076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 46176dda93cSYan, Zheng out_up_read: 46276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 463cb8e7090SChristoph Hellwig out_drop_write: 464cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 465cb8e7090SChristoph Hellwig out_dput: 466cb8e7090SChristoph Hellwig dput(dentry); 467cb8e7090SChristoph Hellwig out_unlock: 46876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 469cb8e7090SChristoph Hellwig return error; 470cb8e7090SChristoph Hellwig } 471cb8e7090SChristoph Hellwig 472b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 473f46b5a66SChristoph Hellwig { 474f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 475f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 476f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 4773eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 478f46b5a66SChristoph Hellwig struct page *page; 479f46b5a66SChristoph Hellwig unsigned long last_index; 480f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 481f46b5a66SChristoph Hellwig unsigned long total_read = 0; 482f46b5a66SChristoph Hellwig u64 page_start; 483f46b5a66SChristoph Hellwig u64 page_end; 484f46b5a66SChristoph Hellwig unsigned long i; 485f46b5a66SChristoph Hellwig int ret; 486f46b5a66SChristoph Hellwig 4876a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 488f46b5a66SChristoph Hellwig if (ret) 489f46b5a66SChristoph Hellwig return -ENOSPC; 490f46b5a66SChristoph Hellwig 491f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 492f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 493f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 494f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 495f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 496f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 497f46b5a66SChristoph Hellwig } 498f46b5a66SChristoph Hellwig total_read++; 4993eaa2885SChris Mason again: 500f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 501f46b5a66SChristoph Hellwig if (!page) 502f46b5a66SChristoph Hellwig goto out_unlock; 503f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 504f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 505f46b5a66SChristoph Hellwig lock_page(page); 506f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 507f46b5a66SChristoph Hellwig unlock_page(page); 508f46b5a66SChristoph Hellwig page_cache_release(page); 509f46b5a66SChristoph Hellwig goto out_unlock; 510f46b5a66SChristoph Hellwig } 511f46b5a66SChristoph Hellwig } 512f46b5a66SChristoph Hellwig 513f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 514f46b5a66SChristoph Hellwig 515f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 516f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 517f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 5183eaa2885SChris Mason 5193eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 5203eaa2885SChris Mason if (ordered) { 5213eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 5223eaa2885SChris Mason unlock_page(page); 5233eaa2885SChris Mason page_cache_release(page); 5243eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 5253eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 5263eaa2885SChris Mason goto again; 5273eaa2885SChris Mason } 5283eaa2885SChris Mason set_page_extent_mapped(page); 5293eaa2885SChris Mason 530f87f057bSChris Mason /* 531f87f057bSChris Mason * this makes sure page_mkwrite is called on the 532f87f057bSChris Mason * page if it is dirtied again later 533f87f057bSChris Mason */ 534f87f057bSChris Mason clear_page_dirty_for_io(page); 535f87f057bSChris Mason 536ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 537f46b5a66SChristoph Hellwig set_page_dirty(page); 538a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 539f46b5a66SChristoph Hellwig unlock_page(page); 540f46b5a66SChristoph Hellwig page_cache_release(page); 541f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 542f46b5a66SChristoph Hellwig } 543f46b5a66SChristoph Hellwig 544f46b5a66SChristoph Hellwig out_unlock: 545f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 546f46b5a66SChristoph Hellwig return 0; 547f46b5a66SChristoph Hellwig } 548f46b5a66SChristoph Hellwig 54976dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 55076dda93cSYan, Zheng void __user *arg) 551f46b5a66SChristoph Hellwig { 552f46b5a66SChristoph Hellwig u64 new_size; 553f46b5a66SChristoph Hellwig u64 old_size; 554f46b5a66SChristoph Hellwig u64 devid = 1; 555f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 556f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 557f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 558f46b5a66SChristoph Hellwig char *sizestr; 559f46b5a66SChristoph Hellwig char *devstr = NULL; 560f46b5a66SChristoph Hellwig int ret = 0; 561f46b5a66SChristoph Hellwig int namelen; 562f46b5a66SChristoph Hellwig int mod = 0; 563f46b5a66SChristoph Hellwig 564c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 565c146afadSYan Zheng return -EROFS; 566c146afadSYan Zheng 567e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 568e441d54dSChris Mason return -EPERM; 569e441d54dSChris Mason 570dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 571dae7b665SLi Zefan if (IS_ERR(vol_args)) 572dae7b665SLi Zefan return PTR_ERR(vol_args); 5735516e595SMark Fasheh 5745516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 575f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 576f46b5a66SChristoph Hellwig 5777d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 578f46b5a66SChristoph Hellwig sizestr = vol_args->name; 579f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 580f46b5a66SChristoph Hellwig if (devstr) { 581f46b5a66SChristoph Hellwig char *end; 582f46b5a66SChristoph Hellwig sizestr = devstr + 1; 583f46b5a66SChristoph Hellwig *devstr = '\0'; 584f46b5a66SChristoph Hellwig devstr = vol_args->name; 585f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 58621380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 58721380931SJoel Becker (unsigned long long)devid); 588f46b5a66SChristoph Hellwig } 5892b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 590f46b5a66SChristoph Hellwig if (!device) { 59121380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 59221380931SJoel Becker (unsigned long long)devid); 593f46b5a66SChristoph Hellwig ret = -EINVAL; 594f46b5a66SChristoph Hellwig goto out_unlock; 595f46b5a66SChristoph Hellwig } 596f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 597f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 598f46b5a66SChristoph Hellwig else { 599f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 600f46b5a66SChristoph Hellwig mod = -1; 601f46b5a66SChristoph Hellwig sizestr++; 602f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 603f46b5a66SChristoph Hellwig mod = 1; 604f46b5a66SChristoph Hellwig sizestr++; 605f46b5a66SChristoph Hellwig } 606f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 607f46b5a66SChristoph Hellwig if (new_size == 0) { 608f46b5a66SChristoph Hellwig ret = -EINVAL; 609f46b5a66SChristoph Hellwig goto out_unlock; 610f46b5a66SChristoph Hellwig } 611f46b5a66SChristoph Hellwig } 612f46b5a66SChristoph Hellwig 613f46b5a66SChristoph Hellwig old_size = device->total_bytes; 614f46b5a66SChristoph Hellwig 615f46b5a66SChristoph Hellwig if (mod < 0) { 616f46b5a66SChristoph Hellwig if (new_size > old_size) { 617f46b5a66SChristoph Hellwig ret = -EINVAL; 618f46b5a66SChristoph Hellwig goto out_unlock; 619f46b5a66SChristoph Hellwig } 620f46b5a66SChristoph Hellwig new_size = old_size - new_size; 621f46b5a66SChristoph Hellwig } else if (mod > 0) { 622f46b5a66SChristoph Hellwig new_size = old_size + new_size; 623f46b5a66SChristoph Hellwig } 624f46b5a66SChristoph Hellwig 625f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 626f46b5a66SChristoph Hellwig ret = -EINVAL; 627f46b5a66SChristoph Hellwig goto out_unlock; 628f46b5a66SChristoph Hellwig } 629f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 630f46b5a66SChristoph Hellwig ret = -EFBIG; 631f46b5a66SChristoph Hellwig goto out_unlock; 632f46b5a66SChristoph Hellwig } 633f46b5a66SChristoph Hellwig 634f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 635f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 636f46b5a66SChristoph Hellwig 637f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 638f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 639f46b5a66SChristoph Hellwig 640f46b5a66SChristoph Hellwig if (new_size > old_size) { 641f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 642f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 643f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 644f46b5a66SChristoph Hellwig } else { 645f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 646f46b5a66SChristoph Hellwig } 647f46b5a66SChristoph Hellwig 648f46b5a66SChristoph Hellwig out_unlock: 6497d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 650f46b5a66SChristoph Hellwig kfree(vol_args); 651f46b5a66SChristoph Hellwig return ret; 652f46b5a66SChristoph Hellwig } 653f46b5a66SChristoph Hellwig 654cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 6553de4586cSChris Mason void __user *arg, int subvol) 656f46b5a66SChristoph Hellwig { 657cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 658f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 6593de4586cSChris Mason struct file *src_file; 660f46b5a66SChristoph Hellwig int namelen; 6613de4586cSChris Mason int ret = 0; 662f46b5a66SChristoph Hellwig 663c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 664c146afadSYan Zheng return -EROFS; 665c146afadSYan Zheng 666dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 667dae7b665SLi Zefan if (IS_ERR(vol_args)) 668dae7b665SLi Zefan return PTR_ERR(vol_args); 669f46b5a66SChristoph Hellwig 6705516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 671f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 672f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 673f46b5a66SChristoph Hellwig ret = -EINVAL; 674f46b5a66SChristoph Hellwig goto out; 675f46b5a66SChristoph Hellwig } 676f46b5a66SChristoph Hellwig 6773de4586cSChris Mason if (subvol) { 67876dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 67976dda93cSYan, Zheng NULL); 680cb8e7090SChristoph Hellwig } else { 6813de4586cSChris Mason struct inode *src_inode; 6823de4586cSChris Mason src_file = fget(vol_args->fd); 6833de4586cSChris Mason if (!src_file) { 6843de4586cSChris Mason ret = -EINVAL; 6853de4586cSChris Mason goto out; 6863de4586cSChris Mason } 6873de4586cSChris Mason 6883de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 6893de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 690d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 691d397712bSChris Mason "another FS\n"); 6923de4586cSChris Mason ret = -EINVAL; 6933de4586cSChris Mason fput(src_file); 6943de4586cSChris Mason goto out; 6953de4586cSChris Mason } 69676dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 69776dda93cSYan, Zheng BTRFS_I(src_inode)->root); 6983de4586cSChris Mason fput(src_file); 699cb8e7090SChristoph Hellwig } 700f46b5a66SChristoph Hellwig out: 701f46b5a66SChristoph Hellwig kfree(vol_args); 702f46b5a66SChristoph Hellwig return ret; 703f46b5a66SChristoph Hellwig } 704f46b5a66SChristoph Hellwig 70576dda93cSYan, Zheng /* 70676dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 70776dda93cSYan, Zheng */ 70876dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 70976dda93cSYan, Zheng { 71076dda93cSYan, Zheng struct btrfs_path *path; 71176dda93cSYan, Zheng struct btrfs_key key; 71276dda93cSYan, Zheng int ret; 71376dda93cSYan, Zheng 71476dda93cSYan, Zheng path = btrfs_alloc_path(); 71576dda93cSYan, Zheng if (!path) 71676dda93cSYan, Zheng return -ENOMEM; 71776dda93cSYan, Zheng 71876dda93cSYan, Zheng key.objectid = root->root_key.objectid; 71976dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 72076dda93cSYan, Zheng key.offset = (u64)-1; 72176dda93cSYan, Zheng 72276dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 72376dda93cSYan, Zheng &key, path, 0, 0); 72476dda93cSYan, Zheng if (ret < 0) 72576dda93cSYan, Zheng goto out; 72676dda93cSYan, Zheng BUG_ON(ret == 0); 72776dda93cSYan, Zheng 72876dda93cSYan, Zheng ret = 0; 72976dda93cSYan, Zheng if (path->slots[0] > 0) { 73076dda93cSYan, Zheng path->slots[0]--; 73176dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 73276dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 73376dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 73476dda93cSYan, Zheng ret = -ENOTEMPTY; 73576dda93cSYan, Zheng } 73676dda93cSYan, Zheng out: 73776dda93cSYan, Zheng btrfs_free_path(path); 73876dda93cSYan, Zheng return ret; 73976dda93cSYan, Zheng } 74076dda93cSYan, Zheng 74176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 74276dda93cSYan, Zheng void __user *arg) 74376dda93cSYan, Zheng { 74476dda93cSYan, Zheng struct dentry *parent = fdentry(file); 74576dda93cSYan, Zheng struct dentry *dentry; 74676dda93cSYan, Zheng struct inode *dir = parent->d_inode; 74776dda93cSYan, Zheng struct inode *inode; 74876dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 74976dda93cSYan, Zheng struct btrfs_root *dest = NULL; 75076dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 75176dda93cSYan, Zheng struct btrfs_trans_handle *trans; 75276dda93cSYan, Zheng int namelen; 75376dda93cSYan, Zheng int ret; 75476dda93cSYan, Zheng int err = 0; 75576dda93cSYan, Zheng 75676dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 75776dda93cSYan, Zheng return -EPERM; 75876dda93cSYan, Zheng 75976dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 76076dda93cSYan, Zheng if (IS_ERR(vol_args)) 76176dda93cSYan, Zheng return PTR_ERR(vol_args); 76276dda93cSYan, Zheng 76376dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 76476dda93cSYan, Zheng namelen = strlen(vol_args->name); 76576dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 76676dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 76776dda93cSYan, Zheng err = -EINVAL; 76876dda93cSYan, Zheng goto out; 76976dda93cSYan, Zheng } 77076dda93cSYan, Zheng 77176dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 77276dda93cSYan, Zheng if (err) 77376dda93cSYan, Zheng goto out; 77476dda93cSYan, Zheng 77576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 77676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 77776dda93cSYan, Zheng if (IS_ERR(dentry)) { 77876dda93cSYan, Zheng err = PTR_ERR(dentry); 77976dda93cSYan, Zheng goto out_unlock_dir; 78076dda93cSYan, Zheng } 78176dda93cSYan, Zheng 78276dda93cSYan, Zheng if (!dentry->d_inode) { 78376dda93cSYan, Zheng err = -ENOENT; 78476dda93cSYan, Zheng goto out_dput; 78576dda93cSYan, Zheng } 78676dda93cSYan, Zheng 78776dda93cSYan, Zheng inode = dentry->d_inode; 78876dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 78976dda93cSYan, Zheng err = -EINVAL; 79076dda93cSYan, Zheng goto out_dput; 79176dda93cSYan, Zheng } 79276dda93cSYan, Zheng 79376dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 79476dda93cSYan, Zheng 79576dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 79676dda93cSYan, Zheng err = d_invalidate(dentry); 79776dda93cSYan, Zheng if (err) 79876dda93cSYan, Zheng goto out_unlock; 79976dda93cSYan, Zheng 80076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 80176dda93cSYan, Zheng 80276dda93cSYan, Zheng err = may_destroy_subvol(dest); 80376dda93cSYan, Zheng if (err) 80476dda93cSYan, Zheng goto out_up_write; 80576dda93cSYan, Zheng 80676dda93cSYan, Zheng trans = btrfs_start_transaction(root, 1); 80776dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 80876dda93cSYan, Zheng dest->root_key.objectid, 80976dda93cSYan, Zheng dentry->d_name.name, 81076dda93cSYan, Zheng dentry->d_name.len); 81176dda93cSYan, Zheng BUG_ON(ret); 81276dda93cSYan, Zheng 81376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 81476dda93cSYan, Zheng 81576dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 81676dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 81776dda93cSYan, Zheng dest->root_item.drop_level = 0; 81876dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 81976dda93cSYan, Zheng 82076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 82176dda93cSYan, Zheng root->fs_info->tree_root, 82276dda93cSYan, Zheng dest->root_key.objectid); 82376dda93cSYan, Zheng BUG_ON(ret); 82476dda93cSYan, Zheng 82576dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 82676dda93cSYan, Zheng BUG_ON(ret); 82776dda93cSYan, Zheng inode->i_flags |= S_DEAD; 82876dda93cSYan, Zheng out_up_write: 82976dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 83076dda93cSYan, Zheng out_unlock: 83176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 83276dda93cSYan, Zheng if (!err) { 833efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 83476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 83576dda93cSYan, Zheng d_delete(dentry); 83676dda93cSYan, Zheng } 83776dda93cSYan, Zheng out_dput: 83876dda93cSYan, Zheng dput(dentry); 83976dda93cSYan, Zheng out_unlock_dir: 84076dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 84176dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 84276dda93cSYan, Zheng out: 84376dda93cSYan, Zheng kfree(vol_args); 84476dda93cSYan, Zheng return err; 84576dda93cSYan, Zheng } 84676dda93cSYan, Zheng 847f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 848f46b5a66SChristoph Hellwig { 849f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 850f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 851c146afadSYan Zheng int ret; 852c146afadSYan Zheng 853c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 854c146afadSYan Zheng if (ret) 855c146afadSYan Zheng return ret; 856f46b5a66SChristoph Hellwig 857f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 858f46b5a66SChristoph Hellwig case S_IFDIR: 859e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 860e441d54dSChris Mason ret = -EPERM; 861e441d54dSChris Mason goto out; 862e441d54dSChris Mason } 863f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 864f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 865f46b5a66SChristoph Hellwig break; 866f46b5a66SChristoph Hellwig case S_IFREG: 867e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 868e441d54dSChris Mason ret = -EINVAL; 869e441d54dSChris Mason goto out; 870e441d54dSChris Mason } 871f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 872f46b5a66SChristoph Hellwig break; 873f46b5a66SChristoph Hellwig } 874e441d54dSChris Mason out: 875ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 876e441d54dSChris Mason return ret; 877f46b5a66SChristoph Hellwig } 878f46b5a66SChristoph Hellwig 879b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 880f46b5a66SChristoph Hellwig { 881f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 882f46b5a66SChristoph Hellwig int ret; 883f46b5a66SChristoph Hellwig 884e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 885e441d54dSChris Mason return -EPERM; 886e441d54dSChris Mason 887dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 888dae7b665SLi Zefan if (IS_ERR(vol_args)) 889dae7b665SLi Zefan return PTR_ERR(vol_args); 890f46b5a66SChristoph Hellwig 8915516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 892f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 893f46b5a66SChristoph Hellwig 894f46b5a66SChristoph Hellwig kfree(vol_args); 895f46b5a66SChristoph Hellwig return ret; 896f46b5a66SChristoph Hellwig } 897f46b5a66SChristoph Hellwig 898b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 899f46b5a66SChristoph Hellwig { 900f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 901f46b5a66SChristoph Hellwig int ret; 902f46b5a66SChristoph Hellwig 903e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 904e441d54dSChris Mason return -EPERM; 905e441d54dSChris Mason 906c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 907c146afadSYan Zheng return -EROFS; 908c146afadSYan Zheng 909dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 910dae7b665SLi Zefan if (IS_ERR(vol_args)) 911dae7b665SLi Zefan return PTR_ERR(vol_args); 912f46b5a66SChristoph Hellwig 9135516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 914f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 915f46b5a66SChristoph Hellwig 916f46b5a66SChristoph Hellwig kfree(vol_args); 917f46b5a66SChristoph Hellwig return ret; 918f46b5a66SChristoph Hellwig } 919f46b5a66SChristoph Hellwig 92076dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 921b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 922f46b5a66SChristoph Hellwig { 923f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 924f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 925f46b5a66SChristoph Hellwig struct file *src_file; 926f46b5a66SChristoph Hellwig struct inode *src; 927f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 928f46b5a66SChristoph Hellwig struct btrfs_path *path; 929f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 930ae01a0abSYan Zheng char *buf; 931ae01a0abSYan Zheng struct btrfs_key key; 932f46b5a66SChristoph Hellwig u32 nritems; 933f46b5a66SChristoph Hellwig int slot; 934ae01a0abSYan Zheng int ret; 935c5c9cd4dSSage Weil u64 len = olen; 936c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 937c5c9cd4dSSage Weil u64 hint_byte; 938d20f7043SChris Mason 939c5c9cd4dSSage Weil /* 940c5c9cd4dSSage Weil * TODO: 941c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 942c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 943c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 944c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 945c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 946c5c9cd4dSSage Weil * they don't overlap)? 947c5c9cd4dSSage Weil */ 948c5c9cd4dSSage Weil 949e441d54dSChris Mason /* the destination must be opened for writing */ 950e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 951e441d54dSChris Mason return -EINVAL; 952e441d54dSChris Mason 953c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 954c146afadSYan Zheng if (ret) 955c146afadSYan Zheng return ret; 956c146afadSYan Zheng 957c5c9cd4dSSage Weil src_file = fget(srcfd); 958ab67b7c1SYan Zheng if (!src_file) { 959ab67b7c1SYan Zheng ret = -EBADF; 960ab67b7c1SYan Zheng goto out_drop_write; 961ab67b7c1SYan Zheng } 962f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 963f46b5a66SChristoph Hellwig 964c5c9cd4dSSage Weil ret = -EINVAL; 965c5c9cd4dSSage Weil if (src == inode) 966c5c9cd4dSSage Weil goto out_fput; 967c5c9cd4dSSage Weil 968ae01a0abSYan Zheng ret = -EISDIR; 969ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 970f46b5a66SChristoph Hellwig goto out_fput; 971f46b5a66SChristoph Hellwig 972ae01a0abSYan Zheng ret = -EXDEV; 973ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 974ae01a0abSYan Zheng goto out_fput; 975ae01a0abSYan Zheng 976ae01a0abSYan Zheng ret = -ENOMEM; 977ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 978ae01a0abSYan Zheng if (!buf) 979ae01a0abSYan Zheng goto out_fput; 980ae01a0abSYan Zheng 981ae01a0abSYan Zheng path = btrfs_alloc_path(); 982ae01a0abSYan Zheng if (!path) { 983ae01a0abSYan Zheng vfree(buf); 984ae01a0abSYan Zheng goto out_fput; 985ae01a0abSYan Zheng } 986ae01a0abSYan Zheng path->reada = 2; 987ae01a0abSYan Zheng 988f46b5a66SChristoph Hellwig if (inode < src) { 989f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 990f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 991f46b5a66SChristoph Hellwig } else { 992f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 993f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 994f46b5a66SChristoph Hellwig } 995f46b5a66SChristoph Hellwig 996c5c9cd4dSSage Weil /* determine range to clone */ 997c5c9cd4dSSage Weil ret = -EINVAL; 998c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 999f46b5a66SChristoph Hellwig goto out_unlock; 1000c5c9cd4dSSage Weil if (len == 0) 1001c5c9cd4dSSage Weil olen = len = src->i_size - off; 1002c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1003c5c9cd4dSSage Weil if (off + len == src->i_size) 1004c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1005c5c9cd4dSSage Weil - off; 1006c5c9cd4dSSage Weil 1007c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1008c5c9cd4dSSage Weil if ((off & (bs-1)) || 1009c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1010c5c9cd4dSSage Weil goto out_unlock; 1011c5c9cd4dSSage Weil 1012f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1013f46b5a66SChristoph Hellwig another, and lock file content */ 1014f46b5a66SChristoph Hellwig while (1) { 101531840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1016c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1017c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1018ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1019f46b5a66SChristoph Hellwig break; 1020c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1021ae01a0abSYan Zheng if (ordered) 1022ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1023c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1024f46b5a66SChristoph Hellwig } 1025f46b5a66SChristoph Hellwig 1026ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 1027ae01a0abSYan Zheng BUG_ON(!trans); 1028ae01a0abSYan Zheng 1029c5c9cd4dSSage Weil /* punch hole in destination first */ 1030920bbbfbSYan, Zheng btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); 1031c5c9cd4dSSage Weil 1032c5c9cd4dSSage Weil /* clone data */ 1033f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1034ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1035ae01a0abSYan Zheng key.offset = 0; 1036f46b5a66SChristoph Hellwig 1037f46b5a66SChristoph Hellwig while (1) { 1038f46b5a66SChristoph Hellwig /* 1039f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1040f46b5a66SChristoph Hellwig * tree. 1041f46b5a66SChristoph Hellwig */ 1042f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 1043f46b5a66SChristoph Hellwig if (ret < 0) 1044f46b5a66SChristoph Hellwig goto out; 1045f46b5a66SChristoph Hellwig 1046ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1047ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1048f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1049f46b5a66SChristoph Hellwig if (ret < 0) 1050f46b5a66SChristoph Hellwig goto out; 1051f46b5a66SChristoph Hellwig if (ret > 0) 1052f46b5a66SChristoph Hellwig break; 1053ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1054f46b5a66SChristoph Hellwig } 1055f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1056f46b5a66SChristoph Hellwig slot = path->slots[0]; 1057f46b5a66SChristoph Hellwig 1058ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1059d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1060f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1061f46b5a66SChristoph Hellwig break; 1062f46b5a66SChristoph Hellwig 1063c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1064c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1065c5c9cd4dSSage Weil int type; 106631840ae1SZheng Yan u32 size; 106731840ae1SZheng Yan struct btrfs_key new_key; 1068c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1069c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1070c5c9cd4dSSage Weil u8 comp; 107131840ae1SZheng Yan 107231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 107331840ae1SZheng Yan read_extent_buffer(leaf, buf, 107431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 107531840ae1SZheng Yan size); 1076c5c9cd4dSSage Weil 1077c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1078c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1079c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1080c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1081c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1082c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1083d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1084d397712bSChris Mason extent); 1085d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1086d397712bSChris Mason extent); 1087c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1088d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1089d397712bSChris Mason extent); 1090c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1091c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1092c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1093c5c9cd4dSSage Weil extent); 1094c5c9cd4dSSage Weil } 109531840ae1SZheng Yan btrfs_release_path(root, path); 109631840ae1SZheng Yan 1097c5c9cd4dSSage Weil if (key.offset + datal < off || 1098c5c9cd4dSSage Weil key.offset >= off+len) 1099c5c9cd4dSSage Weil goto next; 1100c5c9cd4dSSage Weil 110131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 110231840ae1SZheng Yan new_key.objectid = inode->i_ino; 1103c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1104c5c9cd4dSSage Weil 1105c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1106c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 110731840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 110831840ae1SZheng Yan &new_key, size); 110931840ae1SZheng Yan if (ret) 111031840ae1SZheng Yan goto out; 111131840ae1SZheng Yan 111231840ae1SZheng Yan leaf = path->nodes[0]; 111331840ae1SZheng Yan slot = path->slots[0]; 111431840ae1SZheng Yan write_extent_buffer(leaf, buf, 111531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 111631840ae1SZheng Yan size); 1117ae01a0abSYan Zheng 1118f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1119f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1120c5c9cd4dSSage Weil 1121c5c9cd4dSSage Weil if (off > key.offset) { 1122c5c9cd4dSSage Weil datao += off - key.offset; 1123c5c9cd4dSSage Weil datal -= off - key.offset; 1124c5c9cd4dSSage Weil } 1125ac6889cbSChris Mason 1126ac6889cbSChris Mason if (key.offset + datal > off + len) 1127ac6889cbSChris Mason datal = off + len - key.offset; 1128ac6889cbSChris Mason 1129c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1130c5c9cd4dSSage Weil if (!disko) 1131c5c9cd4dSSage Weil datao = 0; 1132c5c9cd4dSSage Weil 1133c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1134c5c9cd4dSSage Weil datao); 1135c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1136c5c9cd4dSSage Weil datal); 1137c5c9cd4dSSage Weil if (disko) { 1138c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1139ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 11405d4f98a2SYan Zheng disko, diskl, 0, 1141f46b5a66SChristoph Hellwig root->root_key.objectid, 11425d4f98a2SYan Zheng inode->i_ino, 11435d4f98a2SYan Zheng new_key.offset - datao); 1144ae01a0abSYan Zheng BUG_ON(ret); 1145f46b5a66SChristoph Hellwig } 1146c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1147c5c9cd4dSSage Weil u64 skip = 0; 1148c5c9cd4dSSage Weil u64 trim = 0; 1149c5c9cd4dSSage Weil if (off > key.offset) { 1150c5c9cd4dSSage Weil skip = off - key.offset; 1151c5c9cd4dSSage Weil new_key.offset += skip; 115231840ae1SZheng Yan } 1153d397712bSChris Mason 1154c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1155c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1156d397712bSChris Mason 1157c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1158c5c9cd4dSSage Weil ret = -EINVAL; 1159c5c9cd4dSSage Weil goto out; 116031840ae1SZheng Yan } 1161c5c9cd4dSSage Weil size -= skip + trim; 1162c5c9cd4dSSage Weil datal -= skip + trim; 1163c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1164c5c9cd4dSSage Weil &new_key, size); 1165c5c9cd4dSSage Weil if (ret) 1166c5c9cd4dSSage Weil goto out; 1167c5c9cd4dSSage Weil 1168c5c9cd4dSSage Weil if (skip) { 1169d397712bSChris Mason u32 start = 1170d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1171c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1172c5c9cd4dSSage Weil datal); 1173c5c9cd4dSSage Weil } 1174c5c9cd4dSSage Weil 1175c5c9cd4dSSage Weil leaf = path->nodes[0]; 1176c5c9cd4dSSage Weil slot = path->slots[0]; 1177c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1178c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1179c5c9cd4dSSage Weil size); 1180c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1181c5c9cd4dSSage Weil } 1182c5c9cd4dSSage Weil 1183c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1184c5c9cd4dSSage Weil } 1185c5c9cd4dSSage Weil 1186c5c9cd4dSSage Weil next: 118731840ae1SZheng Yan btrfs_release_path(root, path); 1188ae01a0abSYan Zheng key.offset++; 1189ae01a0abSYan Zheng } 1190f46b5a66SChristoph Hellwig ret = 0; 1191f46b5a66SChristoph Hellwig out: 1192ae01a0abSYan Zheng btrfs_release_path(root, path); 1193ae01a0abSYan Zheng if (ret == 0) { 1194ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1195c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1196c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1197ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1198ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1199ae01a0abSYan Zheng } 1200f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1201c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1202ae01a0abSYan Zheng if (ret) 1203ae01a0abSYan Zheng vmtruncate(inode, 0); 1204f46b5a66SChristoph Hellwig out_unlock: 1205f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1206f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1207ae01a0abSYan Zheng vfree(buf); 1208ae01a0abSYan Zheng btrfs_free_path(path); 1209f46b5a66SChristoph Hellwig out_fput: 1210f46b5a66SChristoph Hellwig fput(src_file); 1211ab67b7c1SYan Zheng out_drop_write: 1212ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1213f46b5a66SChristoph Hellwig return ret; 1214f46b5a66SChristoph Hellwig } 1215f46b5a66SChristoph Hellwig 12167a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1217c5c9cd4dSSage Weil { 1218c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1219c5c9cd4dSSage Weil 12207a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1221c5c9cd4dSSage Weil return -EFAULT; 1222c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1223c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1224c5c9cd4dSSage Weil } 1225c5c9cd4dSSage Weil 1226f46b5a66SChristoph Hellwig /* 1227f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1228f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1229f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1230f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1231f46b5a66SChristoph Hellwig */ 1232b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1233f46b5a66SChristoph Hellwig { 1234f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1235f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1236f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 12371ab86aedSSage Weil int ret; 1238f46b5a66SChristoph Hellwig 12391ab86aedSSage Weil ret = -EPERM; 1240df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1241f46b5a66SChristoph Hellwig goto out; 12421ab86aedSSage Weil 12431ab86aedSSage Weil ret = -EINPROGRESS; 12441ab86aedSSage Weil if (file->private_data) 12451ab86aedSSage Weil goto out; 12469ca9ee09SSage Weil 1247c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1248c146afadSYan Zheng if (ret) 1249c146afadSYan Zheng goto out; 1250c146afadSYan Zheng 12519ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12529ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 12539ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12549ca9ee09SSage Weil 1255f46b5a66SChristoph Hellwig ret = -ENOMEM; 12561ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 12571ab86aedSSage Weil if (!trans) 12581ab86aedSSage Weil goto out_drop; 12591ab86aedSSage Weil 12601ab86aedSSage Weil file->private_data = trans; 12611ab86aedSSage Weil return 0; 12621ab86aedSSage Weil 12631ab86aedSSage Weil out_drop: 12641ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 12651ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 12661ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12671ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1268f46b5a66SChristoph Hellwig out: 1269f46b5a66SChristoph Hellwig return ret; 1270f46b5a66SChristoph Hellwig } 1271f46b5a66SChristoph Hellwig 1272f46b5a66SChristoph Hellwig /* 1273f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1274f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1275f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1276f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1277f46b5a66SChristoph Hellwig */ 1278f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1279f46b5a66SChristoph Hellwig { 1280f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1281f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1282f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1283f46b5a66SChristoph Hellwig 1284f46b5a66SChristoph Hellwig trans = file->private_data; 12851ab86aedSSage Weil if (!trans) 12861ab86aedSSage Weil return -EINVAL; 1287b214107eSChristoph Hellwig file->private_data = NULL; 12889ca9ee09SSage Weil 12891ab86aedSSage Weil btrfs_end_transaction(trans, root); 12901ab86aedSSage Weil 12919ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12929ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 12939ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12949ca9ee09SSage Weil 1295cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 12961ab86aedSSage Weil return 0; 1297f46b5a66SChristoph Hellwig } 1298f46b5a66SChristoph Hellwig 1299f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1300f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1301f46b5a66SChristoph Hellwig { 1302f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 13034bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1304f46b5a66SChristoph Hellwig 1305f46b5a66SChristoph Hellwig switch (cmd) { 13066cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 13076cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 13086cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 13096cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 13106cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 13116cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1312f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 13134bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 13143de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 13154bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 131676dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 131776dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 1318f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1319f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1320f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 13214bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1322f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 13234bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1324f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 13254bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1326f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1327f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1328f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1329c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1330c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 13317a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1332f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1333f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1334f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1335f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1336f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1337f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1338f46b5a66SChristoph Hellwig return 0; 1339f46b5a66SChristoph Hellwig } 1340f46b5a66SChristoph Hellwig 1341f46b5a66SChristoph Hellwig return -ENOTTY; 1342f46b5a66SChristoph Hellwig } 1343