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 2426a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 243f46b5a66SChristoph Hellwig if (ret) 24476dda93cSYan, Zheng return ret; 245f46b5a66SChristoph Hellwig 246f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 247f46b5a66SChristoph Hellwig BUG_ON(!trans); 248f46b5a66SChristoph Hellwig 249f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 250f46b5a66SChristoph Hellwig 0, &objectid); 251f46b5a66SChristoph Hellwig if (ret) 252f46b5a66SChristoph Hellwig goto fail; 253f46b5a66SChristoph Hellwig 2545d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2555d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2568e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2578e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2588e8a1e31SJosef Bacik goto fail; 2598e8a1e31SJosef Bacik } 260f46b5a66SChristoph Hellwig 2615d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 262f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 263f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2645d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 265f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 266f46b5a66SChristoph Hellwig 267f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 268f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 269f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2705d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2715d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2725d4f98a2SYan Zheng BTRFS_UUID_SIZE); 273f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 274f46b5a66SChristoph Hellwig 275f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 276f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 277f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 278f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 279f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 280a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 281f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 282f46b5a66SChristoph Hellwig 283f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28484234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 285f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 286f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 287f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 28880ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 289f46b5a66SChristoph Hellwig 290f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 291f46b5a66SChristoph Hellwig root_item.drop_level = 0; 292f46b5a66SChristoph Hellwig 293925baeddSChris Mason btrfs_tree_unlock(leaf); 294f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 295f46b5a66SChristoph Hellwig leaf = NULL; 296f46b5a66SChristoph Hellwig 297f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 298f46b5a66SChristoph Hellwig 299f46b5a66SChristoph Hellwig key.objectid = objectid; 3005d4f98a2SYan Zheng key.offset = 0; 301f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 302f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 303f46b5a66SChristoph Hellwig &root_item); 304f46b5a66SChristoph Hellwig if (ret) 305f46b5a66SChristoph Hellwig goto fail; 306f46b5a66SChristoph Hellwig 30776dda93cSYan, Zheng key.offset = (u64)-1; 30876dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 30976dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31076dda93cSYan, Zheng 31176dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31276dda93cSYan, Zheng 31376dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 31476dda93cSYan, Zheng BTRFS_I(dir)->block_group); 315f46b5a66SChristoph Hellwig /* 316f46b5a66SChristoph Hellwig * insert the directory item 317f46b5a66SChristoph Hellwig */ 3183de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3193de4586cSChris Mason BUG_ON(ret); 3203de4586cSChris Mason 3213de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 322f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3233de4586cSChris Mason BTRFS_FT_DIR, index); 324f46b5a66SChristoph Hellwig if (ret) 325f46b5a66SChristoph Hellwig goto fail; 3260660b5afSChris Mason 32752c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 32852c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 32952c26179SYan Zheng BUG_ON(ret); 33052c26179SYan Zheng 3310660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3324df27c4dSYan, Zheng objectid, root->root_key.objectid, 3330660b5afSChris Mason dir->i_ino, index, name, namelen); 33476dda93cSYan, Zheng 3350660b5afSChris Mason BUG_ON(ret); 3360660b5afSChris Mason 33776dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 338f46b5a66SChristoph Hellwig fail: 339f46b5a66SChristoph Hellwig nr = trans->blocks_used; 34076dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 341f46b5a66SChristoph Hellwig if (err && !ret) 342f46b5a66SChristoph Hellwig ret = err; 343f46b5a66SChristoph Hellwig return ret; 344f46b5a66SChristoph Hellwig } 345f46b5a66SChristoph Hellwig 3463de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3473de4586cSChris Mason char *name, int namelen) 348f46b5a66SChristoph Hellwig { 349f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 350f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3513de4586cSChris Mason int ret = 0; 352f46b5a66SChristoph Hellwig int err; 353f46b5a66SChristoph Hellwig unsigned long nr = 0; 354f46b5a66SChristoph Hellwig 355f46b5a66SChristoph Hellwig if (!root->ref_cows) 356f46b5a66SChristoph Hellwig return -EINVAL; 357f46b5a66SChristoph Hellwig 3586a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 359f46b5a66SChristoph Hellwig if (ret) 360f46b5a66SChristoph Hellwig goto fail_unlock; 361f46b5a66SChristoph Hellwig 3623de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 363f46b5a66SChristoph Hellwig if (!pending_snapshot) { 364f46b5a66SChristoph Hellwig ret = -ENOMEM; 365f46b5a66SChristoph Hellwig goto fail_unlock; 366f46b5a66SChristoph Hellwig } 367f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 368f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 369f46b5a66SChristoph Hellwig ret = -ENOMEM; 370f46b5a66SChristoph Hellwig kfree(pending_snapshot); 371f46b5a66SChristoph Hellwig goto fail_unlock; 372f46b5a66SChristoph Hellwig } 373f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 374f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3753de4586cSChris Mason pending_snapshot->dentry = dentry; 376f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 377f46b5a66SChristoph Hellwig BUG_ON(!trans); 378f46b5a66SChristoph Hellwig pending_snapshot->root = root; 379f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 380f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 381f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 382f46b5a66SChristoph Hellwig 383f46b5a66SChristoph Hellwig fail_unlock: 384f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 385f46b5a66SChristoph Hellwig return ret; 386f46b5a66SChristoph Hellwig } 387f46b5a66SChristoph Hellwig 388cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 389cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 390cb8e7090SChristoph Hellwig { 391cb8e7090SChristoph Hellwig if (child->d_inode) 392cb8e7090SChristoph Hellwig return -EEXIST; 393cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 394cb8e7090SChristoph Hellwig return -ENOENT; 395cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 396cb8e7090SChristoph Hellwig } 397cb8e7090SChristoph Hellwig 398cb8e7090SChristoph Hellwig /* 399cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 400cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 401cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 402cb8e7090SChristoph Hellwig */ 40376dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 40476dda93cSYan, Zheng char *name, int namelen, 4053de4586cSChris Mason struct btrfs_root *snap_src) 406cb8e7090SChristoph Hellwig { 40776dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 408cb8e7090SChristoph Hellwig struct dentry *dentry; 409cb8e7090SChristoph Hellwig int error; 410cb8e7090SChristoph Hellwig 41176dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 412cb8e7090SChristoph Hellwig 413cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 414cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 415cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 416cb8e7090SChristoph Hellwig goto out_unlock; 417cb8e7090SChristoph Hellwig 418cb8e7090SChristoph Hellwig error = -EEXIST; 419cb8e7090SChristoph Hellwig if (dentry->d_inode) 420cb8e7090SChristoph Hellwig goto out_dput; 421cb8e7090SChristoph Hellwig 422cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 423cb8e7090SChristoph Hellwig if (error) 424cb8e7090SChristoph Hellwig goto out_dput; 425cb8e7090SChristoph Hellwig 42676dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 427cb8e7090SChristoph Hellwig if (error) 428cb8e7090SChristoph Hellwig goto out_drop_write; 429cb8e7090SChristoph Hellwig 43076dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 43176dda93cSYan, Zheng 43276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 43376dda93cSYan, Zheng goto out_up_read; 43476dda93cSYan, Zheng 4353de4586cSChris Mason if (snap_src) { 43676dda93cSYan, Zheng error = create_snapshot(snap_src, dentry, 43776dda93cSYan, Zheng name, namelen); 4383de4586cSChris Mason } else { 43976dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 44076dda93cSYan, Zheng name, namelen); 4413de4586cSChris Mason } 44276dda93cSYan, Zheng if (!error) 44376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 44476dda93cSYan, Zheng out_up_read: 44576dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 446cb8e7090SChristoph Hellwig out_drop_write: 447cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 448cb8e7090SChristoph Hellwig out_dput: 449cb8e7090SChristoph Hellwig dput(dentry); 450cb8e7090SChristoph Hellwig out_unlock: 45176dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 452cb8e7090SChristoph Hellwig return error; 453cb8e7090SChristoph Hellwig } 454cb8e7090SChristoph Hellwig 455b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 456f46b5a66SChristoph Hellwig { 457f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 458f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 459f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 4603eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 461f46b5a66SChristoph Hellwig struct page *page; 462f46b5a66SChristoph Hellwig unsigned long last_index; 463f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 464f46b5a66SChristoph Hellwig unsigned long total_read = 0; 465f46b5a66SChristoph Hellwig u64 page_start; 466f46b5a66SChristoph Hellwig u64 page_end; 467f46b5a66SChristoph Hellwig unsigned long i; 468f46b5a66SChristoph Hellwig int ret; 469f46b5a66SChristoph Hellwig 4706a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 471f46b5a66SChristoph Hellwig if (ret) 472f46b5a66SChristoph Hellwig return -ENOSPC; 473f46b5a66SChristoph Hellwig 474f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 475f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 476f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 477f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 478f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 479f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 480f46b5a66SChristoph Hellwig } 481f46b5a66SChristoph Hellwig total_read++; 4823eaa2885SChris Mason again: 483f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 484f46b5a66SChristoph Hellwig if (!page) 485f46b5a66SChristoph Hellwig goto out_unlock; 486f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 487f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 488f46b5a66SChristoph Hellwig lock_page(page); 489f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 490f46b5a66SChristoph Hellwig unlock_page(page); 491f46b5a66SChristoph Hellwig page_cache_release(page); 492f46b5a66SChristoph Hellwig goto out_unlock; 493f46b5a66SChristoph Hellwig } 494f46b5a66SChristoph Hellwig } 495f46b5a66SChristoph Hellwig 496f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 497f46b5a66SChristoph Hellwig 498f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 499f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 500f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 5013eaa2885SChris Mason 5023eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 5033eaa2885SChris Mason if (ordered) { 5043eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 5053eaa2885SChris Mason unlock_page(page); 5063eaa2885SChris Mason page_cache_release(page); 5073eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 5083eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 5093eaa2885SChris Mason goto again; 5103eaa2885SChris Mason } 5113eaa2885SChris Mason set_page_extent_mapped(page); 5123eaa2885SChris Mason 513f87f057bSChris Mason /* 514f87f057bSChris Mason * this makes sure page_mkwrite is called on the 515f87f057bSChris Mason * page if it is dirtied again later 516f87f057bSChris Mason */ 517f87f057bSChris Mason clear_page_dirty_for_io(page); 518f87f057bSChris Mason 519ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 520f46b5a66SChristoph Hellwig set_page_dirty(page); 521a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 522f46b5a66SChristoph Hellwig unlock_page(page); 523f46b5a66SChristoph Hellwig page_cache_release(page); 524f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 525f46b5a66SChristoph Hellwig } 526f46b5a66SChristoph Hellwig 527f46b5a66SChristoph Hellwig out_unlock: 528f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 529f46b5a66SChristoph Hellwig return 0; 530f46b5a66SChristoph Hellwig } 531f46b5a66SChristoph Hellwig 53276dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 53376dda93cSYan, Zheng void __user *arg) 534f46b5a66SChristoph Hellwig { 535f46b5a66SChristoph Hellwig u64 new_size; 536f46b5a66SChristoph Hellwig u64 old_size; 537f46b5a66SChristoph Hellwig u64 devid = 1; 538f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 539f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 540f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 541f46b5a66SChristoph Hellwig char *sizestr; 542f46b5a66SChristoph Hellwig char *devstr = NULL; 543f46b5a66SChristoph Hellwig int ret = 0; 544f46b5a66SChristoph Hellwig int namelen; 545f46b5a66SChristoph Hellwig int mod = 0; 546f46b5a66SChristoph Hellwig 547c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 548c146afadSYan Zheng return -EROFS; 549c146afadSYan Zheng 550e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 551e441d54dSChris Mason return -EPERM; 552e441d54dSChris Mason 553dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 554dae7b665SLi Zefan if (IS_ERR(vol_args)) 555dae7b665SLi Zefan return PTR_ERR(vol_args); 5565516e595SMark Fasheh 5575516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 558f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 559f46b5a66SChristoph Hellwig 5607d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 561f46b5a66SChristoph Hellwig sizestr = vol_args->name; 562f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 563f46b5a66SChristoph Hellwig if (devstr) { 564f46b5a66SChristoph Hellwig char *end; 565f46b5a66SChristoph Hellwig sizestr = devstr + 1; 566f46b5a66SChristoph Hellwig *devstr = '\0'; 567f46b5a66SChristoph Hellwig devstr = vol_args->name; 568f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 56921380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 57021380931SJoel Becker (unsigned long long)devid); 571f46b5a66SChristoph Hellwig } 5722b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 573f46b5a66SChristoph Hellwig if (!device) { 57421380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 57521380931SJoel Becker (unsigned long long)devid); 576f46b5a66SChristoph Hellwig ret = -EINVAL; 577f46b5a66SChristoph Hellwig goto out_unlock; 578f46b5a66SChristoph Hellwig } 579f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 580f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 581f46b5a66SChristoph Hellwig else { 582f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 583f46b5a66SChristoph Hellwig mod = -1; 584f46b5a66SChristoph Hellwig sizestr++; 585f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 586f46b5a66SChristoph Hellwig mod = 1; 587f46b5a66SChristoph Hellwig sizestr++; 588f46b5a66SChristoph Hellwig } 589f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 590f46b5a66SChristoph Hellwig if (new_size == 0) { 591f46b5a66SChristoph Hellwig ret = -EINVAL; 592f46b5a66SChristoph Hellwig goto out_unlock; 593f46b5a66SChristoph Hellwig } 594f46b5a66SChristoph Hellwig } 595f46b5a66SChristoph Hellwig 596f46b5a66SChristoph Hellwig old_size = device->total_bytes; 597f46b5a66SChristoph Hellwig 598f46b5a66SChristoph Hellwig if (mod < 0) { 599f46b5a66SChristoph Hellwig if (new_size > old_size) { 600f46b5a66SChristoph Hellwig ret = -EINVAL; 601f46b5a66SChristoph Hellwig goto out_unlock; 602f46b5a66SChristoph Hellwig } 603f46b5a66SChristoph Hellwig new_size = old_size - new_size; 604f46b5a66SChristoph Hellwig } else if (mod > 0) { 605f46b5a66SChristoph Hellwig new_size = old_size + new_size; 606f46b5a66SChristoph Hellwig } 607f46b5a66SChristoph Hellwig 608f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 609f46b5a66SChristoph Hellwig ret = -EINVAL; 610f46b5a66SChristoph Hellwig goto out_unlock; 611f46b5a66SChristoph Hellwig } 612f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 613f46b5a66SChristoph Hellwig ret = -EFBIG; 614f46b5a66SChristoph Hellwig goto out_unlock; 615f46b5a66SChristoph Hellwig } 616f46b5a66SChristoph Hellwig 617f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 618f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 619f46b5a66SChristoph Hellwig 620f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 621f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 622f46b5a66SChristoph Hellwig 623f46b5a66SChristoph Hellwig if (new_size > old_size) { 624f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 625f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 626f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 627f46b5a66SChristoph Hellwig } else { 628f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 629f46b5a66SChristoph Hellwig } 630f46b5a66SChristoph Hellwig 631f46b5a66SChristoph Hellwig out_unlock: 6327d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 633f46b5a66SChristoph Hellwig kfree(vol_args); 634f46b5a66SChristoph Hellwig return ret; 635f46b5a66SChristoph Hellwig } 636f46b5a66SChristoph Hellwig 637cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 6383de4586cSChris Mason void __user *arg, int subvol) 639f46b5a66SChristoph Hellwig { 640cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 641f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 6423de4586cSChris Mason struct file *src_file; 643f46b5a66SChristoph Hellwig int namelen; 6443de4586cSChris Mason int ret = 0; 645f46b5a66SChristoph Hellwig 646c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 647c146afadSYan Zheng return -EROFS; 648c146afadSYan Zheng 649dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 650dae7b665SLi Zefan if (IS_ERR(vol_args)) 651dae7b665SLi Zefan return PTR_ERR(vol_args); 652f46b5a66SChristoph Hellwig 6535516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 654f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 655f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 656f46b5a66SChristoph Hellwig ret = -EINVAL; 657f46b5a66SChristoph Hellwig goto out; 658f46b5a66SChristoph Hellwig } 659f46b5a66SChristoph Hellwig 6603de4586cSChris Mason if (subvol) { 66176dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 66276dda93cSYan, Zheng NULL); 663cb8e7090SChristoph Hellwig } else { 6643de4586cSChris Mason struct inode *src_inode; 6653de4586cSChris Mason src_file = fget(vol_args->fd); 6663de4586cSChris Mason if (!src_file) { 6673de4586cSChris Mason ret = -EINVAL; 6683de4586cSChris Mason goto out; 6693de4586cSChris Mason } 6703de4586cSChris Mason 6713de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 6723de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 673d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 674d397712bSChris Mason "another FS\n"); 6753de4586cSChris Mason ret = -EINVAL; 6763de4586cSChris Mason fput(src_file); 6773de4586cSChris Mason goto out; 6783de4586cSChris Mason } 67976dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 68076dda93cSYan, Zheng BTRFS_I(src_inode)->root); 6813de4586cSChris Mason fput(src_file); 682cb8e7090SChristoph Hellwig } 683f46b5a66SChristoph Hellwig out: 684f46b5a66SChristoph Hellwig kfree(vol_args); 685f46b5a66SChristoph Hellwig return ret; 686f46b5a66SChristoph Hellwig } 687f46b5a66SChristoph Hellwig 68876dda93cSYan, Zheng /* 68976dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 69076dda93cSYan, Zheng */ 69176dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 69276dda93cSYan, Zheng { 69376dda93cSYan, Zheng struct btrfs_path *path; 69476dda93cSYan, Zheng struct btrfs_key key; 69576dda93cSYan, Zheng int ret; 69676dda93cSYan, Zheng 69776dda93cSYan, Zheng path = btrfs_alloc_path(); 69876dda93cSYan, Zheng if (!path) 69976dda93cSYan, Zheng return -ENOMEM; 70076dda93cSYan, Zheng 70176dda93cSYan, Zheng key.objectid = root->root_key.objectid; 70276dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 70376dda93cSYan, Zheng key.offset = (u64)-1; 70476dda93cSYan, Zheng 70576dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 70676dda93cSYan, Zheng &key, path, 0, 0); 70776dda93cSYan, Zheng if (ret < 0) 70876dda93cSYan, Zheng goto out; 70976dda93cSYan, Zheng BUG_ON(ret == 0); 71076dda93cSYan, Zheng 71176dda93cSYan, Zheng ret = 0; 71276dda93cSYan, Zheng if (path->slots[0] > 0) { 71376dda93cSYan, Zheng path->slots[0]--; 71476dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 71576dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 71676dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 71776dda93cSYan, Zheng ret = -ENOTEMPTY; 71876dda93cSYan, Zheng } 71976dda93cSYan, Zheng out: 72076dda93cSYan, Zheng btrfs_free_path(path); 72176dda93cSYan, Zheng return ret; 72276dda93cSYan, Zheng } 72376dda93cSYan, Zheng 72476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 72576dda93cSYan, Zheng void __user *arg) 72676dda93cSYan, Zheng { 72776dda93cSYan, Zheng struct dentry *parent = fdentry(file); 72876dda93cSYan, Zheng struct dentry *dentry; 72976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 73076dda93cSYan, Zheng struct inode *inode; 73176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 73276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 73376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 73476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 73576dda93cSYan, Zheng int namelen; 73676dda93cSYan, Zheng int ret; 73776dda93cSYan, Zheng int err = 0; 73876dda93cSYan, Zheng 73976dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 74076dda93cSYan, Zheng return -EPERM; 74176dda93cSYan, Zheng 74276dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 74376dda93cSYan, Zheng if (IS_ERR(vol_args)) 74476dda93cSYan, Zheng return PTR_ERR(vol_args); 74576dda93cSYan, Zheng 74676dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 74776dda93cSYan, Zheng namelen = strlen(vol_args->name); 74876dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 74976dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 75076dda93cSYan, Zheng err = -EINVAL; 75176dda93cSYan, Zheng goto out; 75276dda93cSYan, Zheng } 75376dda93cSYan, Zheng 75476dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 75576dda93cSYan, Zheng if (err) 75676dda93cSYan, Zheng goto out; 75776dda93cSYan, Zheng 75876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 75976dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 76076dda93cSYan, Zheng if (IS_ERR(dentry)) { 76176dda93cSYan, Zheng err = PTR_ERR(dentry); 76276dda93cSYan, Zheng goto out_unlock_dir; 76376dda93cSYan, Zheng } 76476dda93cSYan, Zheng 76576dda93cSYan, Zheng if (!dentry->d_inode) { 76676dda93cSYan, Zheng err = -ENOENT; 76776dda93cSYan, Zheng goto out_dput; 76876dda93cSYan, Zheng } 76976dda93cSYan, Zheng 77076dda93cSYan, Zheng inode = dentry->d_inode; 77176dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 77276dda93cSYan, Zheng err = -EINVAL; 77376dda93cSYan, Zheng goto out_dput; 77476dda93cSYan, Zheng } 77576dda93cSYan, Zheng 77676dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 77776dda93cSYan, Zheng 77876dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 77976dda93cSYan, Zheng err = d_invalidate(dentry); 78076dda93cSYan, Zheng if (err) 78176dda93cSYan, Zheng goto out_unlock; 78276dda93cSYan, Zheng 78376dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 78476dda93cSYan, Zheng 78576dda93cSYan, Zheng err = may_destroy_subvol(dest); 78676dda93cSYan, Zheng if (err) 78776dda93cSYan, Zheng goto out_up_write; 78876dda93cSYan, Zheng 78976dda93cSYan, Zheng trans = btrfs_start_transaction(root, 1); 79076dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 79176dda93cSYan, Zheng dest->root_key.objectid, 79276dda93cSYan, Zheng dentry->d_name.name, 79376dda93cSYan, Zheng dentry->d_name.len); 79476dda93cSYan, Zheng BUG_ON(ret); 79576dda93cSYan, Zheng 79676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 79776dda93cSYan, Zheng 79876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 79976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 80076dda93cSYan, Zheng dest->root_item.drop_level = 0; 80176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 80276dda93cSYan, Zheng 80376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 80476dda93cSYan, Zheng root->fs_info->tree_root, 80576dda93cSYan, Zheng dest->root_key.objectid); 80676dda93cSYan, Zheng BUG_ON(ret); 80776dda93cSYan, Zheng 80876dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 80976dda93cSYan, Zheng BUG_ON(ret); 81076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 81176dda93cSYan, Zheng out_up_write: 81276dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 81376dda93cSYan, Zheng out_unlock: 81476dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 81576dda93cSYan, Zheng if (!err) { 81676dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 81776dda93cSYan, Zheng d_delete(dentry); 81876dda93cSYan, Zheng } 81976dda93cSYan, Zheng out_dput: 82076dda93cSYan, Zheng dput(dentry); 82176dda93cSYan, Zheng out_unlock_dir: 82276dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 82376dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 82476dda93cSYan, Zheng out: 82576dda93cSYan, Zheng kfree(vol_args); 82676dda93cSYan, Zheng return err; 82776dda93cSYan, Zheng } 82876dda93cSYan, Zheng 829f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 830f46b5a66SChristoph Hellwig { 831f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 832f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 833c146afadSYan Zheng int ret; 834c146afadSYan Zheng 835c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 836c146afadSYan Zheng if (ret) 837c146afadSYan Zheng return ret; 838f46b5a66SChristoph Hellwig 839f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 840f46b5a66SChristoph Hellwig case S_IFDIR: 841e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 842e441d54dSChris Mason ret = -EPERM; 843e441d54dSChris Mason goto out; 844e441d54dSChris Mason } 845f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 846f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 847f46b5a66SChristoph Hellwig break; 848f46b5a66SChristoph Hellwig case S_IFREG: 849e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 850e441d54dSChris Mason ret = -EINVAL; 851e441d54dSChris Mason goto out; 852e441d54dSChris Mason } 853f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 854f46b5a66SChristoph Hellwig break; 855f46b5a66SChristoph Hellwig } 856e441d54dSChris Mason out: 857ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 858e441d54dSChris Mason return ret; 859f46b5a66SChristoph Hellwig } 860f46b5a66SChristoph Hellwig 861b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 862f46b5a66SChristoph Hellwig { 863f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 864f46b5a66SChristoph Hellwig int ret; 865f46b5a66SChristoph Hellwig 866e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 867e441d54dSChris Mason return -EPERM; 868e441d54dSChris Mason 869dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 870dae7b665SLi Zefan if (IS_ERR(vol_args)) 871dae7b665SLi Zefan return PTR_ERR(vol_args); 872f46b5a66SChristoph Hellwig 8735516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 874f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 875f46b5a66SChristoph Hellwig 876f46b5a66SChristoph Hellwig kfree(vol_args); 877f46b5a66SChristoph Hellwig return ret; 878f46b5a66SChristoph Hellwig } 879f46b5a66SChristoph Hellwig 880b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 881f46b5a66SChristoph Hellwig { 882f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 883f46b5a66SChristoph Hellwig int ret; 884f46b5a66SChristoph Hellwig 885e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 886e441d54dSChris Mason return -EPERM; 887e441d54dSChris Mason 888c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 889c146afadSYan Zheng return -EROFS; 890c146afadSYan Zheng 891dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 892dae7b665SLi Zefan if (IS_ERR(vol_args)) 893dae7b665SLi Zefan return PTR_ERR(vol_args); 894f46b5a66SChristoph Hellwig 8955516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 896f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 897f46b5a66SChristoph Hellwig 898f46b5a66SChristoph Hellwig kfree(vol_args); 899f46b5a66SChristoph Hellwig return ret; 900f46b5a66SChristoph Hellwig } 901f46b5a66SChristoph Hellwig 90276dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 903b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 904f46b5a66SChristoph Hellwig { 905f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 906f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 907f46b5a66SChristoph Hellwig struct file *src_file; 908f46b5a66SChristoph Hellwig struct inode *src; 909f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 910f46b5a66SChristoph Hellwig struct btrfs_path *path; 911f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 912ae01a0abSYan Zheng char *buf; 913ae01a0abSYan Zheng struct btrfs_key key; 914f46b5a66SChristoph Hellwig u32 nritems; 915f46b5a66SChristoph Hellwig int slot; 916ae01a0abSYan Zheng int ret; 917c5c9cd4dSSage Weil u64 len = olen; 918c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 919c5c9cd4dSSage Weil u64 hint_byte; 920d20f7043SChris Mason 921c5c9cd4dSSage Weil /* 922c5c9cd4dSSage Weil * TODO: 923c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 924c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 925c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 926c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 927c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 928c5c9cd4dSSage Weil * they don't overlap)? 929c5c9cd4dSSage Weil */ 930c5c9cd4dSSage Weil 931e441d54dSChris Mason /* the destination must be opened for writing */ 932e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 933e441d54dSChris Mason return -EINVAL; 934e441d54dSChris Mason 935c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 936c146afadSYan Zheng if (ret) 937c146afadSYan Zheng return ret; 938c146afadSYan Zheng 939c5c9cd4dSSage Weil src_file = fget(srcfd); 940ab67b7c1SYan Zheng if (!src_file) { 941ab67b7c1SYan Zheng ret = -EBADF; 942ab67b7c1SYan Zheng goto out_drop_write; 943ab67b7c1SYan Zheng } 944f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 945f46b5a66SChristoph Hellwig 946c5c9cd4dSSage Weil ret = -EINVAL; 947c5c9cd4dSSage Weil if (src == inode) 948c5c9cd4dSSage Weil goto out_fput; 949c5c9cd4dSSage Weil 950ae01a0abSYan Zheng ret = -EISDIR; 951ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 952f46b5a66SChristoph Hellwig goto out_fput; 953f46b5a66SChristoph Hellwig 954ae01a0abSYan Zheng ret = -EXDEV; 955ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 956ae01a0abSYan Zheng goto out_fput; 957ae01a0abSYan Zheng 958ae01a0abSYan Zheng ret = -ENOMEM; 959ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 960ae01a0abSYan Zheng if (!buf) 961ae01a0abSYan Zheng goto out_fput; 962ae01a0abSYan Zheng 963ae01a0abSYan Zheng path = btrfs_alloc_path(); 964ae01a0abSYan Zheng if (!path) { 965ae01a0abSYan Zheng vfree(buf); 966ae01a0abSYan Zheng goto out_fput; 967ae01a0abSYan Zheng } 968ae01a0abSYan Zheng path->reada = 2; 969ae01a0abSYan Zheng 970f46b5a66SChristoph Hellwig if (inode < src) { 971f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 972f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 973f46b5a66SChristoph Hellwig } else { 974f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 975f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 976f46b5a66SChristoph Hellwig } 977f46b5a66SChristoph Hellwig 978c5c9cd4dSSage Weil /* determine range to clone */ 979c5c9cd4dSSage Weil ret = -EINVAL; 980c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 981f46b5a66SChristoph Hellwig goto out_unlock; 982c5c9cd4dSSage Weil if (len == 0) 983c5c9cd4dSSage Weil olen = len = src->i_size - off; 984c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 985c5c9cd4dSSage Weil if (off + len == src->i_size) 986c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 987c5c9cd4dSSage Weil - off; 988c5c9cd4dSSage Weil 989c5c9cd4dSSage Weil /* verify the end result is block aligned */ 990c5c9cd4dSSage Weil if ((off & (bs-1)) || 991c5c9cd4dSSage Weil ((off + len) & (bs-1))) 992c5c9cd4dSSage Weil goto out_unlock; 993c5c9cd4dSSage Weil 994f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 995f46b5a66SChristoph Hellwig another, and lock file content */ 996f46b5a66SChristoph Hellwig while (1) { 99731840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 998c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 999c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1000ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1001f46b5a66SChristoph Hellwig break; 1002c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1003ae01a0abSYan Zheng if (ordered) 1004ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1005c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1006f46b5a66SChristoph Hellwig } 1007f46b5a66SChristoph Hellwig 1008ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 1009ae01a0abSYan Zheng BUG_ON(!trans); 1010ae01a0abSYan Zheng 1011c5c9cd4dSSage Weil /* punch hole in destination first */ 1012e980b50cSChris Mason btrfs_drop_extents(trans, root, inode, off, off + len, 1013a1ed835eSChris Mason off + len, 0, &hint_byte, 1); 1014c5c9cd4dSSage Weil 1015c5c9cd4dSSage Weil /* clone data */ 1016f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1017ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1018ae01a0abSYan Zheng key.offset = 0; 1019f46b5a66SChristoph Hellwig 1020f46b5a66SChristoph Hellwig while (1) { 1021f46b5a66SChristoph Hellwig /* 1022f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1023f46b5a66SChristoph Hellwig * tree. 1024f46b5a66SChristoph Hellwig */ 1025f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 1026f46b5a66SChristoph Hellwig if (ret < 0) 1027f46b5a66SChristoph Hellwig goto out; 1028f46b5a66SChristoph Hellwig 1029ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1030ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1031f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1032f46b5a66SChristoph Hellwig if (ret < 0) 1033f46b5a66SChristoph Hellwig goto out; 1034f46b5a66SChristoph Hellwig if (ret > 0) 1035f46b5a66SChristoph Hellwig break; 1036ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1037f46b5a66SChristoph Hellwig } 1038f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1039f46b5a66SChristoph Hellwig slot = path->slots[0]; 1040f46b5a66SChristoph Hellwig 1041ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1042d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1043f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1044f46b5a66SChristoph Hellwig break; 1045f46b5a66SChristoph Hellwig 1046c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1047c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1048c5c9cd4dSSage Weil int type; 104931840ae1SZheng Yan u32 size; 105031840ae1SZheng Yan struct btrfs_key new_key; 1051c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1052c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1053c5c9cd4dSSage Weil u8 comp; 105431840ae1SZheng Yan 105531840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 105631840ae1SZheng Yan read_extent_buffer(leaf, buf, 105731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 105831840ae1SZheng Yan size); 1059c5c9cd4dSSage Weil 1060c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1061c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1062c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1063c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1064c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1065c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1066d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1067d397712bSChris Mason extent); 1068d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1069d397712bSChris Mason extent); 1070c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1071d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1072d397712bSChris Mason extent); 1073c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1074c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1075c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1076c5c9cd4dSSage Weil extent); 1077c5c9cd4dSSage Weil } 107831840ae1SZheng Yan btrfs_release_path(root, path); 107931840ae1SZheng Yan 1080c5c9cd4dSSage Weil if (key.offset + datal < off || 1081c5c9cd4dSSage Weil key.offset >= off+len) 1082c5c9cd4dSSage Weil goto next; 1083c5c9cd4dSSage Weil 108431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 108531840ae1SZheng Yan new_key.objectid = inode->i_ino; 1086c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1087c5c9cd4dSSage Weil 1088c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1089c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 109031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 109131840ae1SZheng Yan &new_key, size); 109231840ae1SZheng Yan if (ret) 109331840ae1SZheng Yan goto out; 109431840ae1SZheng Yan 109531840ae1SZheng Yan leaf = path->nodes[0]; 109631840ae1SZheng Yan slot = path->slots[0]; 109731840ae1SZheng Yan write_extent_buffer(leaf, buf, 109831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 109931840ae1SZheng Yan size); 1100ae01a0abSYan Zheng 1101f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1102f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1103c5c9cd4dSSage Weil 1104c5c9cd4dSSage Weil if (off > key.offset) { 1105c5c9cd4dSSage Weil datao += off - key.offset; 1106c5c9cd4dSSage Weil datal -= off - key.offset; 1107c5c9cd4dSSage Weil } 1108c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 1109c5c9cd4dSSage Weil off + len) 1110c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 1111c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1112c5c9cd4dSSage Weil if (!disko) 1113c5c9cd4dSSage Weil datao = 0; 1114c5c9cd4dSSage Weil 1115c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1116c5c9cd4dSSage Weil datao); 1117c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1118c5c9cd4dSSage Weil datal); 1119c5c9cd4dSSage Weil if (disko) { 1120c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1121ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 11225d4f98a2SYan Zheng disko, diskl, 0, 1123f46b5a66SChristoph Hellwig root->root_key.objectid, 11245d4f98a2SYan Zheng inode->i_ino, 11255d4f98a2SYan Zheng new_key.offset - datao); 1126ae01a0abSYan Zheng BUG_ON(ret); 1127f46b5a66SChristoph Hellwig } 1128c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1129c5c9cd4dSSage Weil u64 skip = 0; 1130c5c9cd4dSSage Weil u64 trim = 0; 1131c5c9cd4dSSage Weil if (off > key.offset) { 1132c5c9cd4dSSage Weil skip = off - key.offset; 1133c5c9cd4dSSage Weil new_key.offset += skip; 113431840ae1SZheng Yan } 1135d397712bSChris Mason 1136c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1137c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1138d397712bSChris Mason 1139c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1140c5c9cd4dSSage Weil ret = -EINVAL; 1141c5c9cd4dSSage Weil goto out; 114231840ae1SZheng Yan } 1143c5c9cd4dSSage Weil size -= skip + trim; 1144c5c9cd4dSSage Weil datal -= skip + trim; 1145c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1146c5c9cd4dSSage Weil &new_key, size); 1147c5c9cd4dSSage Weil if (ret) 1148c5c9cd4dSSage Weil goto out; 1149c5c9cd4dSSage Weil 1150c5c9cd4dSSage Weil if (skip) { 1151d397712bSChris Mason u32 start = 1152d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1153c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1154c5c9cd4dSSage Weil datal); 1155c5c9cd4dSSage Weil } 1156c5c9cd4dSSage Weil 1157c5c9cd4dSSage Weil leaf = path->nodes[0]; 1158c5c9cd4dSSage Weil slot = path->slots[0]; 1159c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1160c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1161c5c9cd4dSSage Weil size); 1162c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1163c5c9cd4dSSage Weil } 1164c5c9cd4dSSage Weil 1165c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1166c5c9cd4dSSage Weil } 1167c5c9cd4dSSage Weil 1168c5c9cd4dSSage Weil next: 116931840ae1SZheng Yan btrfs_release_path(root, path); 1170ae01a0abSYan Zheng key.offset++; 1171ae01a0abSYan Zheng } 1172f46b5a66SChristoph Hellwig ret = 0; 1173f46b5a66SChristoph Hellwig out: 1174ae01a0abSYan Zheng btrfs_release_path(root, path); 1175ae01a0abSYan Zheng if (ret == 0) { 1176ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1177c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1178c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1179ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1180ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1181ae01a0abSYan Zheng } 1182f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1183c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1184ae01a0abSYan Zheng if (ret) 1185ae01a0abSYan Zheng vmtruncate(inode, 0); 1186f46b5a66SChristoph Hellwig out_unlock: 1187f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1188f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1189ae01a0abSYan Zheng vfree(buf); 1190ae01a0abSYan Zheng btrfs_free_path(path); 1191f46b5a66SChristoph Hellwig out_fput: 1192f46b5a66SChristoph Hellwig fput(src_file); 1193ab67b7c1SYan Zheng out_drop_write: 1194ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1195f46b5a66SChristoph Hellwig return ret; 1196f46b5a66SChristoph Hellwig } 1197f46b5a66SChristoph Hellwig 11987a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1199c5c9cd4dSSage Weil { 1200c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1201c5c9cd4dSSage Weil 12027a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1203c5c9cd4dSSage Weil return -EFAULT; 1204c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1205c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1206c5c9cd4dSSage Weil } 1207c5c9cd4dSSage Weil 1208f46b5a66SChristoph Hellwig /* 1209f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1210f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1211f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1212f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1213f46b5a66SChristoph Hellwig */ 1214b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1215f46b5a66SChristoph Hellwig { 1216f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1217f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1218f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1219f46b5a66SChristoph Hellwig int ret = 0; 1220f46b5a66SChristoph Hellwig 1221df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1222df5b5520SChristoph Hellwig return -EPERM; 1223df5b5520SChristoph Hellwig 1224f46b5a66SChristoph Hellwig if (file->private_data) { 1225f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1226f46b5a66SChristoph Hellwig goto out; 1227f46b5a66SChristoph Hellwig } 12289ca9ee09SSage Weil 1229c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1230c146afadSYan Zheng if (ret) 1231c146afadSYan Zheng goto out; 1232c146afadSYan Zheng 12339ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12349ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 12359ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12369ca9ee09SSage Weil 12379ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1238f46b5a66SChristoph Hellwig if (trans) 1239f46b5a66SChristoph Hellwig file->private_data = trans; 1240f46b5a66SChristoph Hellwig else 1241f46b5a66SChristoph Hellwig ret = -ENOMEM; 1242f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1243f46b5a66SChristoph Hellwig out: 1244f46b5a66SChristoph Hellwig return ret; 1245f46b5a66SChristoph Hellwig } 1246f46b5a66SChristoph Hellwig 1247f46b5a66SChristoph Hellwig /* 1248f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1249f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1250f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1251f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1252f46b5a66SChristoph Hellwig */ 1253f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1254f46b5a66SChristoph Hellwig { 1255f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1256f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1257f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1258f46b5a66SChristoph Hellwig int ret = 0; 1259f46b5a66SChristoph Hellwig 1260f46b5a66SChristoph Hellwig trans = file->private_data; 1261f46b5a66SChristoph Hellwig if (!trans) { 1262f46b5a66SChristoph Hellwig ret = -EINVAL; 1263f46b5a66SChristoph Hellwig goto out; 1264f46b5a66SChristoph Hellwig } 1265f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1266b214107eSChristoph Hellwig file->private_data = NULL; 12679ca9ee09SSage Weil 12689ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12699ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 12709ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12719ca9ee09SSage Weil 1272cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 1273cfc8ea87SSage Weil 1274f46b5a66SChristoph Hellwig out: 1275f46b5a66SChristoph Hellwig return ret; 1276f46b5a66SChristoph Hellwig } 1277f46b5a66SChristoph Hellwig 1278f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1279f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1280f46b5a66SChristoph Hellwig { 1281f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 12824bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1283f46b5a66SChristoph Hellwig 1284f46b5a66SChristoph Hellwig switch (cmd) { 12856cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 12866cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 12876cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 12886cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 12896cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 12906cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1291f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 12924bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 12933de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 12944bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 129576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 129676dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 1297f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1298f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1299f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 13004bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1301f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 13024bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1303f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 13044bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1305f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1306f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1307f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1308c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1309c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 13107a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1311f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1312f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1313f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1314f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1315f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1316f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1317f46b5a66SChristoph Hellwig return 0; 1318f46b5a66SChristoph Hellwig } 1319f46b5a66SChristoph Hellwig 1320f46b5a66SChristoph Hellwig return -ENOTTY; 1321f46b5a66SChristoph Hellwig } 1322