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; 233f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 234f46b5a66SChristoph Hellwig struct inode *dir; 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) 244f46b5a66SChristoph Hellwig goto fail_commit; 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 307f46b5a66SChristoph Hellwig /* 308f46b5a66SChristoph Hellwig * insert the directory item 309f46b5a66SChristoph Hellwig */ 310f46b5a66SChristoph Hellwig key.offset = (u64)-1; 3113de4586cSChris Mason dir = dentry->d_parent->d_inode; 3123de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3133de4586cSChris Mason BUG_ON(ret); 3143de4586cSChris Mason 3153de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 316f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3173de4586cSChris Mason BTRFS_FT_DIR, index); 318f46b5a66SChristoph Hellwig if (ret) 319f46b5a66SChristoph Hellwig goto fail; 3200660b5afSChris Mason 32152c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 32252c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 32352c26179SYan Zheng BUG_ON(ret); 32452c26179SYan Zheng 3250660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3264df27c4dSYan, Zheng objectid, root->root_key.objectid, 3270660b5afSChris Mason dir->i_ino, index, name, namelen); 3280660b5afSChris Mason BUG_ON(ret); 3290660b5afSChris Mason 330f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 331f46b5a66SChristoph Hellwig if (ret) 332f46b5a66SChristoph Hellwig goto fail_commit; 333f46b5a66SChristoph Hellwig 3343de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 335f46b5a66SChristoph Hellwig BUG_ON(!new_root); 336f46b5a66SChristoph Hellwig 337f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 338f46b5a66SChristoph Hellwig BUG_ON(!trans); 339f46b5a66SChristoph Hellwig 340d2fb3437SYan Zheng ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, 341f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 342f46b5a66SChristoph Hellwig if (ret) 343f46b5a66SChristoph Hellwig goto fail; 344f46b5a66SChristoph Hellwig 345f46b5a66SChristoph Hellwig fail: 346f46b5a66SChristoph Hellwig nr = trans->blocks_used; 347f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 348f46b5a66SChristoph Hellwig if (err && !ret) 349f46b5a66SChristoph Hellwig ret = err; 350f46b5a66SChristoph Hellwig fail_commit: 351f46b5a66SChristoph Hellwig 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 3676a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 368f46b5a66SChristoph Hellwig if (ret) 369f46b5a66SChristoph Hellwig goto fail_unlock; 370f46b5a66SChristoph Hellwig 3713de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 372f46b5a66SChristoph Hellwig if (!pending_snapshot) { 373f46b5a66SChristoph Hellwig ret = -ENOMEM; 374f46b5a66SChristoph Hellwig goto fail_unlock; 375f46b5a66SChristoph Hellwig } 376f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 377f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 378f46b5a66SChristoph Hellwig ret = -ENOMEM; 379f46b5a66SChristoph Hellwig kfree(pending_snapshot); 380f46b5a66SChristoph Hellwig goto fail_unlock; 381f46b5a66SChristoph Hellwig } 382f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 383f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3843de4586cSChris Mason pending_snapshot->dentry = dentry; 385f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 386f46b5a66SChristoph Hellwig BUG_ON(!trans); 387f46b5a66SChristoph Hellwig pending_snapshot->root = root; 388f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 389f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 390f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 391f46b5a66SChristoph Hellwig 392f46b5a66SChristoph Hellwig fail_unlock: 393f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 394f46b5a66SChristoph Hellwig return ret; 395f46b5a66SChristoph Hellwig } 396f46b5a66SChristoph Hellwig 397cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 398cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 399cb8e7090SChristoph Hellwig { 400cb8e7090SChristoph Hellwig if (child->d_inode) 401cb8e7090SChristoph Hellwig return -EEXIST; 402cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 403cb8e7090SChristoph Hellwig return -ENOENT; 404cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 405cb8e7090SChristoph Hellwig } 406cb8e7090SChristoph Hellwig 407cb8e7090SChristoph Hellwig /* 408cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 409cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 410cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 411cb8e7090SChristoph Hellwig */ 412cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 4133de4586cSChris Mason int mode, int namelen, 4143de4586cSChris Mason struct btrfs_root *snap_src) 415cb8e7090SChristoph Hellwig { 416cb8e7090SChristoph Hellwig struct dentry *dentry; 417cb8e7090SChristoph Hellwig int error; 418cb8e7090SChristoph Hellwig 419cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 420cb8e7090SChristoph Hellwig 421cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 422cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 423cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 424cb8e7090SChristoph Hellwig goto out_unlock; 425cb8e7090SChristoph Hellwig 426cb8e7090SChristoph Hellwig error = -EEXIST; 427cb8e7090SChristoph Hellwig if (dentry->d_inode) 428cb8e7090SChristoph Hellwig goto out_dput; 429cb8e7090SChristoph Hellwig 430cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 431ce3b0f8dSAl Viro mode &= ~current_umask(); 4323de4586cSChris Mason 433cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 434cb8e7090SChristoph Hellwig if (error) 435cb8e7090SChristoph Hellwig goto out_dput; 436cb8e7090SChristoph Hellwig 437cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 438cb8e7090SChristoph Hellwig if (error) 439cb8e7090SChristoph Hellwig goto out_drop_write; 440cb8e7090SChristoph Hellwig 441cb8e7090SChristoph Hellwig /* 442cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 443cb8e7090SChristoph Hellwig * this VFS fuzz. 444cb8e7090SChristoph Hellwig * 445cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 446cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 447cb8e7090SChristoph Hellwig * 448cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 449cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 450cb8e7090SChristoph Hellwig */ 4513de4586cSChris Mason if (snap_src) { 452ea9e8b11SChris Mason struct dentry *dir = dentry->d_parent; 453ea9e8b11SChris Mason struct dentry *test = dir->d_parent; 454ea9e8b11SChris Mason struct btrfs_path *path = btrfs_alloc_path(); 455ea9e8b11SChris Mason int ret; 456ea9e8b11SChris Mason u64 test_oid; 457ea9e8b11SChris Mason u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; 458ea9e8b11SChris Mason 459ea9e8b11SChris Mason test_oid = snap_src->root_key.objectid; 460ea9e8b11SChris Mason 461ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 462ea9e8b11SChris Mason path, parent_oid, test_oid); 463ea9e8b11SChris Mason if (ret == 0) 464ea9e8b11SChris Mason goto create; 465ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 466ea9e8b11SChris Mason 467ea9e8b11SChris Mason /* we need to make sure we aren't creating a directory loop 468ea9e8b11SChris Mason * by taking a snapshot of something that has our current 469ea9e8b11SChris Mason * subvol in its directory tree. So, this loops through 470ea9e8b11SChris Mason * the dentries and checks the forward refs for each subvolume 471ea9e8b11SChris Mason * to see if is references the subvolume where we are 472ea9e8b11SChris Mason * placing this new snapshot. 473ea9e8b11SChris Mason */ 474ea9e8b11SChris Mason while (1) { 475ea9e8b11SChris Mason if (!test || 476ea9e8b11SChris Mason dir == snap_src->fs_info->sb->s_root || 477ea9e8b11SChris Mason test == snap_src->fs_info->sb->s_root || 478ea9e8b11SChris Mason test->d_inode->i_sb != snap_src->fs_info->sb) { 479ea9e8b11SChris Mason break; 480ea9e8b11SChris Mason } 481ea9e8b11SChris Mason if (S_ISLNK(test->d_inode->i_mode)) { 482d397712bSChris Mason printk(KERN_INFO "Btrfs symlink in snapshot " 483d397712bSChris Mason "path, failed\n"); 484ea9e8b11SChris Mason error = -EMLINK; 485ea9e8b11SChris Mason btrfs_free_path(path); 486ea9e8b11SChris Mason goto out_drop_write; 487ea9e8b11SChris Mason } 488ea9e8b11SChris Mason test_oid = 489ea9e8b11SChris Mason BTRFS_I(test->d_inode)->root->root_key.objectid; 490ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 491ea9e8b11SChris Mason path, test_oid, parent_oid); 492ea9e8b11SChris Mason if (ret == 0) { 493d397712bSChris Mason printk(KERN_INFO "Btrfs snapshot creation " 494d397712bSChris Mason "failed, looping\n"); 495ea9e8b11SChris Mason error = -EMLINK; 496ea9e8b11SChris Mason btrfs_free_path(path); 497ea9e8b11SChris Mason goto out_drop_write; 498ea9e8b11SChris Mason } 499ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 500ea9e8b11SChris Mason test = test->d_parent; 501ea9e8b11SChris Mason } 502ea9e8b11SChris Mason create: 503ea9e8b11SChris Mason btrfs_free_path(path); 5043de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 5053de4586cSChris Mason } else { 5063de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 5073de4586cSChris Mason dentry, name, namelen); 5083de4586cSChris Mason } 509cb8e7090SChristoph Hellwig if (error) 510cb8e7090SChristoph Hellwig goto out_drop_write; 511cb8e7090SChristoph Hellwig 512cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 513cb8e7090SChristoph Hellwig out_drop_write: 514cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 515cb8e7090SChristoph Hellwig out_dput: 516cb8e7090SChristoph Hellwig dput(dentry); 517cb8e7090SChristoph Hellwig out_unlock: 518cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 519cb8e7090SChristoph Hellwig return error; 520cb8e7090SChristoph Hellwig } 521cb8e7090SChristoph Hellwig 522cb8e7090SChristoph Hellwig 523b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 524f46b5a66SChristoph Hellwig { 525f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 526f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 527f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5283eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 529f46b5a66SChristoph Hellwig struct page *page; 530f46b5a66SChristoph Hellwig unsigned long last_index; 531f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 532f46b5a66SChristoph Hellwig unsigned long total_read = 0; 533f46b5a66SChristoph Hellwig u64 page_start; 534f46b5a66SChristoph Hellwig u64 page_end; 535f46b5a66SChristoph Hellwig unsigned long i; 536f46b5a66SChristoph Hellwig int ret; 537f46b5a66SChristoph Hellwig 5386a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 539f46b5a66SChristoph Hellwig if (ret) 540f46b5a66SChristoph Hellwig return -ENOSPC; 541f46b5a66SChristoph Hellwig 542f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 543f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 544f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 545f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 546f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 547f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 548f46b5a66SChristoph Hellwig } 549f46b5a66SChristoph Hellwig total_read++; 5503eaa2885SChris Mason again: 551f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 552f46b5a66SChristoph Hellwig if (!page) 553f46b5a66SChristoph Hellwig goto out_unlock; 554f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 555f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 556f46b5a66SChristoph Hellwig lock_page(page); 557f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 558f46b5a66SChristoph Hellwig unlock_page(page); 559f46b5a66SChristoph Hellwig page_cache_release(page); 560f46b5a66SChristoph Hellwig goto out_unlock; 561f46b5a66SChristoph Hellwig } 562f46b5a66SChristoph Hellwig } 563f46b5a66SChristoph Hellwig 564f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 565f46b5a66SChristoph Hellwig 566f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 567f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 568f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 5693eaa2885SChris Mason 5703eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 5713eaa2885SChris Mason if (ordered) { 5723eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 5733eaa2885SChris Mason unlock_page(page); 5743eaa2885SChris Mason page_cache_release(page); 5753eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 5763eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 5773eaa2885SChris Mason goto again; 5783eaa2885SChris Mason } 5793eaa2885SChris Mason set_page_extent_mapped(page); 5803eaa2885SChris Mason 581f87f057bSChris Mason /* 582f87f057bSChris Mason * this makes sure page_mkwrite is called on the 583f87f057bSChris Mason * page if it is dirtied again later 584f87f057bSChris Mason */ 585f87f057bSChris Mason clear_page_dirty_for_io(page); 586f87f057bSChris Mason 587ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 588f46b5a66SChristoph Hellwig set_page_dirty(page); 589a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 590f46b5a66SChristoph Hellwig unlock_page(page); 591f46b5a66SChristoph Hellwig page_cache_release(page); 592f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 593f46b5a66SChristoph Hellwig } 594f46b5a66SChristoph Hellwig 595f46b5a66SChristoph Hellwig out_unlock: 596f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 597f46b5a66SChristoph Hellwig return 0; 598f46b5a66SChristoph Hellwig } 599f46b5a66SChristoph Hellwig 600f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 601f46b5a66SChristoph Hellwig { 602f46b5a66SChristoph Hellwig u64 new_size; 603f46b5a66SChristoph Hellwig u64 old_size; 604f46b5a66SChristoph Hellwig u64 devid = 1; 605f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 606f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 607f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 608f46b5a66SChristoph Hellwig char *sizestr; 609f46b5a66SChristoph Hellwig char *devstr = NULL; 610f46b5a66SChristoph Hellwig int ret = 0; 611f46b5a66SChristoph Hellwig int namelen; 612f46b5a66SChristoph Hellwig int mod = 0; 613f46b5a66SChristoph Hellwig 614c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 615c146afadSYan Zheng return -EROFS; 616c146afadSYan Zheng 617e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 618e441d54dSChris Mason return -EPERM; 619e441d54dSChris Mason 620dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 621dae7b665SLi Zefan if (IS_ERR(vol_args)) 622dae7b665SLi Zefan return PTR_ERR(vol_args); 6235516e595SMark Fasheh 6245516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 625f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 626f46b5a66SChristoph Hellwig 6277d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 628f46b5a66SChristoph Hellwig sizestr = vol_args->name; 629f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 630f46b5a66SChristoph Hellwig if (devstr) { 631f46b5a66SChristoph Hellwig char *end; 632f46b5a66SChristoph Hellwig sizestr = devstr + 1; 633f46b5a66SChristoph Hellwig *devstr = '\0'; 634f46b5a66SChristoph Hellwig devstr = vol_args->name; 635f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 63621380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 63721380931SJoel Becker (unsigned long long)devid); 638f46b5a66SChristoph Hellwig } 6392b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 640f46b5a66SChristoph Hellwig if (!device) { 64121380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 64221380931SJoel Becker (unsigned long long)devid); 643f46b5a66SChristoph Hellwig ret = -EINVAL; 644f46b5a66SChristoph Hellwig goto out_unlock; 645f46b5a66SChristoph Hellwig } 646f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 647f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 648f46b5a66SChristoph Hellwig else { 649f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 650f46b5a66SChristoph Hellwig mod = -1; 651f46b5a66SChristoph Hellwig sizestr++; 652f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 653f46b5a66SChristoph Hellwig mod = 1; 654f46b5a66SChristoph Hellwig sizestr++; 655f46b5a66SChristoph Hellwig } 656f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 657f46b5a66SChristoph Hellwig if (new_size == 0) { 658f46b5a66SChristoph Hellwig ret = -EINVAL; 659f46b5a66SChristoph Hellwig goto out_unlock; 660f46b5a66SChristoph Hellwig } 661f46b5a66SChristoph Hellwig } 662f46b5a66SChristoph Hellwig 663f46b5a66SChristoph Hellwig old_size = device->total_bytes; 664f46b5a66SChristoph Hellwig 665f46b5a66SChristoph Hellwig if (mod < 0) { 666f46b5a66SChristoph Hellwig if (new_size > old_size) { 667f46b5a66SChristoph Hellwig ret = -EINVAL; 668f46b5a66SChristoph Hellwig goto out_unlock; 669f46b5a66SChristoph Hellwig } 670f46b5a66SChristoph Hellwig new_size = old_size - new_size; 671f46b5a66SChristoph Hellwig } else if (mod > 0) { 672f46b5a66SChristoph Hellwig new_size = old_size + new_size; 673f46b5a66SChristoph Hellwig } 674f46b5a66SChristoph Hellwig 675f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 676f46b5a66SChristoph Hellwig ret = -EINVAL; 677f46b5a66SChristoph Hellwig goto out_unlock; 678f46b5a66SChristoph Hellwig } 679f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 680f46b5a66SChristoph Hellwig ret = -EFBIG; 681f46b5a66SChristoph Hellwig goto out_unlock; 682f46b5a66SChristoph Hellwig } 683f46b5a66SChristoph Hellwig 684f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 685f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 686f46b5a66SChristoph Hellwig 687f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 688f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 689f46b5a66SChristoph Hellwig 690f46b5a66SChristoph Hellwig if (new_size > old_size) { 691f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 692f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 693f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 694f46b5a66SChristoph Hellwig } else { 695f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 696f46b5a66SChristoph Hellwig } 697f46b5a66SChristoph Hellwig 698f46b5a66SChristoph Hellwig out_unlock: 6997d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 700f46b5a66SChristoph Hellwig kfree(vol_args); 701f46b5a66SChristoph Hellwig return ret; 702f46b5a66SChristoph Hellwig } 703f46b5a66SChristoph Hellwig 704cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 7053de4586cSChris Mason void __user *arg, int subvol) 706f46b5a66SChristoph Hellwig { 707cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 708f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 709f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 710f46b5a66SChristoph Hellwig struct btrfs_path *path; 7113de4586cSChris Mason struct file *src_file; 712f46b5a66SChristoph Hellwig u64 root_dirid; 713f46b5a66SChristoph Hellwig int namelen; 7143de4586cSChris Mason int ret = 0; 715f46b5a66SChristoph Hellwig 716c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 717c146afadSYan Zheng return -EROFS; 718c146afadSYan Zheng 719dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 720dae7b665SLi Zefan if (IS_ERR(vol_args)) 721dae7b665SLi Zefan return PTR_ERR(vol_args); 722f46b5a66SChristoph Hellwig 7235516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 724f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 725f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 726f46b5a66SChristoph Hellwig ret = -EINVAL; 727f46b5a66SChristoph Hellwig goto out; 728f46b5a66SChristoph Hellwig } 729f46b5a66SChristoph Hellwig 730f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 731f46b5a66SChristoph Hellwig if (!path) { 732f46b5a66SChristoph Hellwig ret = -ENOMEM; 733f46b5a66SChristoph Hellwig goto out; 734f46b5a66SChristoph Hellwig } 735f46b5a66SChristoph Hellwig 736f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 737f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 738f46b5a66SChristoph Hellwig path, root_dirid, 739f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 740f46b5a66SChristoph Hellwig btrfs_free_path(path); 741f46b5a66SChristoph Hellwig 742f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 743f46b5a66SChristoph Hellwig ret = -EEXIST; 744f46b5a66SChristoph Hellwig goto out; 745f46b5a66SChristoph Hellwig } 746f46b5a66SChristoph Hellwig 747f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 748f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 749f46b5a66SChristoph Hellwig goto out; 750f46b5a66SChristoph Hellwig } 751f46b5a66SChristoph Hellwig 7523de4586cSChris Mason if (subvol) { 753cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 754cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 7553de4586cSChris Mason namelen, NULL); 756cb8e7090SChristoph Hellwig } else { 7573de4586cSChris Mason struct inode *src_inode; 7583de4586cSChris Mason src_file = fget(vol_args->fd); 7593de4586cSChris Mason if (!src_file) { 7603de4586cSChris Mason ret = -EINVAL; 7613de4586cSChris Mason goto out; 7623de4586cSChris Mason } 7633de4586cSChris Mason 7643de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 7653de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 766d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 767d397712bSChris Mason "another FS\n"); 7683de4586cSChris Mason ret = -EINVAL; 7693de4586cSChris Mason fput(src_file); 7703de4586cSChris Mason goto out; 7713de4586cSChris Mason } 7723de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 7733de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 7743de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 7753de4586cSChris Mason fput(src_file); 776cb8e7090SChristoph Hellwig } 777cb8e7090SChristoph Hellwig 778f46b5a66SChristoph Hellwig out: 779f46b5a66SChristoph Hellwig kfree(vol_args); 780f46b5a66SChristoph Hellwig return ret; 781f46b5a66SChristoph Hellwig } 782f46b5a66SChristoph Hellwig 783f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 784f46b5a66SChristoph Hellwig { 785f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 786f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 787c146afadSYan Zheng int ret; 788c146afadSYan Zheng 789c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 790c146afadSYan Zheng if (ret) 791c146afadSYan Zheng return ret; 792f46b5a66SChristoph Hellwig 793f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 794f46b5a66SChristoph Hellwig case S_IFDIR: 795e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 796e441d54dSChris Mason ret = -EPERM; 797e441d54dSChris Mason goto out; 798e441d54dSChris Mason } 799f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 800f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 801f46b5a66SChristoph Hellwig break; 802f46b5a66SChristoph Hellwig case S_IFREG: 803e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 804e441d54dSChris Mason ret = -EINVAL; 805e441d54dSChris Mason goto out; 806e441d54dSChris Mason } 807f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 808f46b5a66SChristoph Hellwig break; 809f46b5a66SChristoph Hellwig } 810e441d54dSChris Mason out: 811ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 812e441d54dSChris Mason return ret; 813f46b5a66SChristoph Hellwig } 814f46b5a66SChristoph Hellwig 815b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 816f46b5a66SChristoph Hellwig { 817f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 818f46b5a66SChristoph Hellwig int ret; 819f46b5a66SChristoph Hellwig 820e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 821e441d54dSChris Mason return -EPERM; 822e441d54dSChris Mason 823dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 824dae7b665SLi Zefan if (IS_ERR(vol_args)) 825dae7b665SLi Zefan return PTR_ERR(vol_args); 826f46b5a66SChristoph Hellwig 8275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 828f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 829f46b5a66SChristoph Hellwig 830f46b5a66SChristoph Hellwig kfree(vol_args); 831f46b5a66SChristoph Hellwig return ret; 832f46b5a66SChristoph Hellwig } 833f46b5a66SChristoph Hellwig 834b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 835f46b5a66SChristoph Hellwig { 836f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 837f46b5a66SChristoph Hellwig int ret; 838f46b5a66SChristoph Hellwig 839e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 840e441d54dSChris Mason return -EPERM; 841e441d54dSChris Mason 842c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 843c146afadSYan Zheng return -EROFS; 844c146afadSYan Zheng 845dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 846dae7b665SLi Zefan if (IS_ERR(vol_args)) 847dae7b665SLi Zefan return PTR_ERR(vol_args); 848f46b5a66SChristoph Hellwig 8495516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 850f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 851f46b5a66SChristoph Hellwig 852f46b5a66SChristoph Hellwig kfree(vol_args); 853f46b5a66SChristoph Hellwig return ret; 854f46b5a66SChristoph Hellwig } 855f46b5a66SChristoph Hellwig 856b2950863SChristoph Hellwig static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 857b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 858f46b5a66SChristoph Hellwig { 859f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 860f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 861f46b5a66SChristoph Hellwig struct file *src_file; 862f46b5a66SChristoph Hellwig struct inode *src; 863f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 864f46b5a66SChristoph Hellwig struct btrfs_path *path; 865f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 866ae01a0abSYan Zheng char *buf; 867ae01a0abSYan Zheng struct btrfs_key key; 868f46b5a66SChristoph Hellwig u32 nritems; 869f46b5a66SChristoph Hellwig int slot; 870ae01a0abSYan Zheng int ret; 871c5c9cd4dSSage Weil u64 len = olen; 872c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 873c5c9cd4dSSage Weil u64 hint_byte; 874d20f7043SChris Mason 875c5c9cd4dSSage Weil /* 876c5c9cd4dSSage Weil * TODO: 877c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 878c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 879c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 880c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 881c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 882c5c9cd4dSSage Weil * they don't overlap)? 883c5c9cd4dSSage Weil */ 884c5c9cd4dSSage Weil 885e441d54dSChris Mason /* the destination must be opened for writing */ 886e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 887e441d54dSChris Mason return -EINVAL; 888e441d54dSChris Mason 889c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 890c146afadSYan Zheng if (ret) 891c146afadSYan Zheng return ret; 892c146afadSYan Zheng 893c5c9cd4dSSage Weil src_file = fget(srcfd); 894ab67b7c1SYan Zheng if (!src_file) { 895ab67b7c1SYan Zheng ret = -EBADF; 896ab67b7c1SYan Zheng goto out_drop_write; 897ab67b7c1SYan Zheng } 898f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 899f46b5a66SChristoph Hellwig 900c5c9cd4dSSage Weil ret = -EINVAL; 901c5c9cd4dSSage Weil if (src == inode) 902c5c9cd4dSSage Weil goto out_fput; 903c5c9cd4dSSage Weil 904ae01a0abSYan Zheng ret = -EISDIR; 905ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 906f46b5a66SChristoph Hellwig goto out_fput; 907f46b5a66SChristoph Hellwig 908ae01a0abSYan Zheng ret = -EXDEV; 909ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 910ae01a0abSYan Zheng goto out_fput; 911ae01a0abSYan Zheng 912ae01a0abSYan Zheng ret = -ENOMEM; 913ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 914ae01a0abSYan Zheng if (!buf) 915ae01a0abSYan Zheng goto out_fput; 916ae01a0abSYan Zheng 917ae01a0abSYan Zheng path = btrfs_alloc_path(); 918ae01a0abSYan Zheng if (!path) { 919ae01a0abSYan Zheng vfree(buf); 920ae01a0abSYan Zheng goto out_fput; 921ae01a0abSYan Zheng } 922ae01a0abSYan Zheng path->reada = 2; 923ae01a0abSYan Zheng 924f46b5a66SChristoph Hellwig if (inode < src) { 925f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 926f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 927f46b5a66SChristoph Hellwig } else { 928f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 929f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 930f46b5a66SChristoph Hellwig } 931f46b5a66SChristoph Hellwig 932c5c9cd4dSSage Weil /* determine range to clone */ 933c5c9cd4dSSage Weil ret = -EINVAL; 934c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 935f46b5a66SChristoph Hellwig goto out_unlock; 936c5c9cd4dSSage Weil if (len == 0) 937c5c9cd4dSSage Weil olen = len = src->i_size - off; 938c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 939c5c9cd4dSSage Weil if (off + len == src->i_size) 940c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 941c5c9cd4dSSage Weil - off; 942c5c9cd4dSSage Weil 943c5c9cd4dSSage Weil /* verify the end result is block aligned */ 944c5c9cd4dSSage Weil if ((off & (bs-1)) || 945c5c9cd4dSSage Weil ((off + len) & (bs-1))) 946c5c9cd4dSSage Weil goto out_unlock; 947c5c9cd4dSSage Weil 948f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 949f46b5a66SChristoph Hellwig another, and lock file content */ 950f46b5a66SChristoph Hellwig while (1) { 95131840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 952c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 953c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 954ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 955f46b5a66SChristoph Hellwig break; 956c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 957ae01a0abSYan Zheng if (ordered) 958ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 959c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 960f46b5a66SChristoph Hellwig } 961f46b5a66SChristoph Hellwig 962ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 963ae01a0abSYan Zheng BUG_ON(!trans); 964ae01a0abSYan Zheng 965c5c9cd4dSSage Weil /* punch hole in destination first */ 966e980b50cSChris Mason btrfs_drop_extents(trans, root, inode, off, off + len, 967a1ed835eSChris Mason off + len, 0, &hint_byte, 1); 968c5c9cd4dSSage Weil 969c5c9cd4dSSage Weil /* clone data */ 970f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 971ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 972ae01a0abSYan Zheng key.offset = 0; 973f46b5a66SChristoph Hellwig 974f46b5a66SChristoph Hellwig while (1) { 975f46b5a66SChristoph Hellwig /* 976f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 977f46b5a66SChristoph Hellwig * tree. 978f46b5a66SChristoph Hellwig */ 979f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 980f46b5a66SChristoph Hellwig if (ret < 0) 981f46b5a66SChristoph Hellwig goto out; 982f46b5a66SChristoph Hellwig 983ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 984ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 985f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 986f46b5a66SChristoph Hellwig if (ret < 0) 987f46b5a66SChristoph Hellwig goto out; 988f46b5a66SChristoph Hellwig if (ret > 0) 989f46b5a66SChristoph Hellwig break; 990ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 991f46b5a66SChristoph Hellwig } 992f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 993f46b5a66SChristoph Hellwig slot = path->slots[0]; 994f46b5a66SChristoph Hellwig 995ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 996d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 997f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 998f46b5a66SChristoph Hellwig break; 999f46b5a66SChristoph Hellwig 1000c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1001c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1002c5c9cd4dSSage Weil int type; 100331840ae1SZheng Yan u32 size; 100431840ae1SZheng Yan struct btrfs_key new_key; 1005c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1006c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1007c5c9cd4dSSage Weil u8 comp; 100831840ae1SZheng Yan 100931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 101031840ae1SZheng Yan read_extent_buffer(leaf, buf, 101131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 101231840ae1SZheng Yan size); 1013c5c9cd4dSSage Weil 1014c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1015c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1016c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1017c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1018c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1019c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1020d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1021d397712bSChris Mason extent); 1022d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1023d397712bSChris Mason extent); 1024c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1025d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1026d397712bSChris Mason extent); 1027c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1028c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1029c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1030c5c9cd4dSSage Weil extent); 1031c5c9cd4dSSage Weil } 103231840ae1SZheng Yan btrfs_release_path(root, path); 103331840ae1SZheng Yan 1034c5c9cd4dSSage Weil if (key.offset + datal < off || 1035c5c9cd4dSSage Weil key.offset >= off+len) 1036c5c9cd4dSSage Weil goto next; 1037c5c9cd4dSSage Weil 103831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 103931840ae1SZheng Yan new_key.objectid = inode->i_ino; 1040c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1041c5c9cd4dSSage Weil 1042c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1043c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 104431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 104531840ae1SZheng Yan &new_key, size); 104631840ae1SZheng Yan if (ret) 104731840ae1SZheng Yan goto out; 104831840ae1SZheng Yan 104931840ae1SZheng Yan leaf = path->nodes[0]; 105031840ae1SZheng Yan slot = path->slots[0]; 105131840ae1SZheng Yan write_extent_buffer(leaf, buf, 105231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 105331840ae1SZheng Yan size); 1054ae01a0abSYan Zheng 1055f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1056f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1057c5c9cd4dSSage Weil 1058c5c9cd4dSSage Weil if (off > key.offset) { 1059c5c9cd4dSSage Weil datao += off - key.offset; 1060c5c9cd4dSSage Weil datal -= off - key.offset; 1061c5c9cd4dSSage Weil } 1062c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 1063c5c9cd4dSSage Weil off + len) 1064c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 1065c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1066c5c9cd4dSSage Weil if (!disko) 1067c5c9cd4dSSage Weil datao = 0; 1068c5c9cd4dSSage Weil 1069c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1070c5c9cd4dSSage Weil datao); 1071c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1072c5c9cd4dSSage Weil datal); 1073c5c9cd4dSSage Weil if (disko) { 1074c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1075ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 10765d4f98a2SYan Zheng disko, diskl, 0, 1077f46b5a66SChristoph Hellwig root->root_key.objectid, 10785d4f98a2SYan Zheng inode->i_ino, 10795d4f98a2SYan Zheng new_key.offset - datao); 1080ae01a0abSYan Zheng BUG_ON(ret); 1081f46b5a66SChristoph Hellwig } 1082c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1083c5c9cd4dSSage Weil u64 skip = 0; 1084c5c9cd4dSSage Weil u64 trim = 0; 1085c5c9cd4dSSage Weil if (off > key.offset) { 1086c5c9cd4dSSage Weil skip = off - key.offset; 1087c5c9cd4dSSage Weil new_key.offset += skip; 108831840ae1SZheng Yan } 1089d397712bSChris Mason 1090c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1091c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1092d397712bSChris Mason 1093c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1094c5c9cd4dSSage Weil ret = -EINVAL; 1095c5c9cd4dSSage Weil goto out; 109631840ae1SZheng Yan } 1097c5c9cd4dSSage Weil size -= skip + trim; 1098c5c9cd4dSSage Weil datal -= skip + trim; 1099c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1100c5c9cd4dSSage Weil &new_key, size); 1101c5c9cd4dSSage Weil if (ret) 1102c5c9cd4dSSage Weil goto out; 1103c5c9cd4dSSage Weil 1104c5c9cd4dSSage Weil if (skip) { 1105d397712bSChris Mason u32 start = 1106d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1107c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1108c5c9cd4dSSage Weil datal); 1109c5c9cd4dSSage Weil } 1110c5c9cd4dSSage Weil 1111c5c9cd4dSSage Weil leaf = path->nodes[0]; 1112c5c9cd4dSSage Weil slot = path->slots[0]; 1113c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1114c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1115c5c9cd4dSSage Weil size); 1116c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1117c5c9cd4dSSage Weil } 1118c5c9cd4dSSage Weil 1119c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1120c5c9cd4dSSage Weil } 1121c5c9cd4dSSage Weil 1122c5c9cd4dSSage Weil next: 112331840ae1SZheng Yan btrfs_release_path(root, path); 1124ae01a0abSYan Zheng key.offset++; 1125ae01a0abSYan Zheng } 1126f46b5a66SChristoph Hellwig ret = 0; 1127f46b5a66SChristoph Hellwig out: 1128ae01a0abSYan Zheng btrfs_release_path(root, path); 1129ae01a0abSYan Zheng if (ret == 0) { 1130ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1131c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1132c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1133ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1134ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1135ae01a0abSYan Zheng } 1136f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1137c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1138ae01a0abSYan Zheng if (ret) 1139ae01a0abSYan Zheng vmtruncate(inode, 0); 1140f46b5a66SChristoph Hellwig out_unlock: 1141f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1142f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1143ae01a0abSYan Zheng vfree(buf); 1144ae01a0abSYan Zheng btrfs_free_path(path); 1145f46b5a66SChristoph Hellwig out_fput: 1146f46b5a66SChristoph Hellwig fput(src_file); 1147ab67b7c1SYan Zheng out_drop_write: 1148ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1149f46b5a66SChristoph Hellwig return ret; 1150f46b5a66SChristoph Hellwig } 1151f46b5a66SChristoph Hellwig 11527a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1153c5c9cd4dSSage Weil { 1154c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1155c5c9cd4dSSage Weil 11567a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1157c5c9cd4dSSage Weil return -EFAULT; 1158c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1159c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1160c5c9cd4dSSage Weil } 1161c5c9cd4dSSage Weil 1162f46b5a66SChristoph Hellwig /* 1163f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1164f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1165f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1166f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1167f46b5a66SChristoph Hellwig */ 1168b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1169f46b5a66SChristoph Hellwig { 1170f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1171f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1172f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1173f46b5a66SChristoph Hellwig int ret = 0; 1174f46b5a66SChristoph Hellwig 1175df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1176df5b5520SChristoph Hellwig return -EPERM; 1177df5b5520SChristoph Hellwig 1178f46b5a66SChristoph Hellwig if (file->private_data) { 1179f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1180f46b5a66SChristoph Hellwig goto out; 1181f46b5a66SChristoph Hellwig } 11829ca9ee09SSage Weil 1183c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1184c146afadSYan Zheng if (ret) 1185c146afadSYan Zheng goto out; 1186c146afadSYan Zheng 11879ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 11889ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 11899ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 11909ca9ee09SSage Weil 11919ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1192f46b5a66SChristoph Hellwig if (trans) 1193f46b5a66SChristoph Hellwig file->private_data = trans; 1194f46b5a66SChristoph Hellwig else 1195f46b5a66SChristoph Hellwig ret = -ENOMEM; 1196f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1197f46b5a66SChristoph Hellwig out: 1198f46b5a66SChristoph Hellwig return ret; 1199f46b5a66SChristoph Hellwig } 1200f46b5a66SChristoph Hellwig 1201f46b5a66SChristoph Hellwig /* 1202f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1203f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1204f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1205f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1206f46b5a66SChristoph Hellwig */ 1207f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1208f46b5a66SChristoph Hellwig { 1209f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1210f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1211f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1212f46b5a66SChristoph Hellwig int ret = 0; 1213f46b5a66SChristoph Hellwig 1214f46b5a66SChristoph Hellwig trans = file->private_data; 1215f46b5a66SChristoph Hellwig if (!trans) { 1216f46b5a66SChristoph Hellwig ret = -EINVAL; 1217f46b5a66SChristoph Hellwig goto out; 1218f46b5a66SChristoph Hellwig } 1219f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1220b214107eSChristoph Hellwig file->private_data = NULL; 12219ca9ee09SSage Weil 12229ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 12239ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 12249ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 12259ca9ee09SSage Weil 1226cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 1227cfc8ea87SSage Weil 1228f46b5a66SChristoph Hellwig out: 1229f46b5a66SChristoph Hellwig return ret; 1230f46b5a66SChristoph Hellwig } 1231f46b5a66SChristoph Hellwig 1232f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1233f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1234f46b5a66SChristoph Hellwig { 1235f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 12364bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1237f46b5a66SChristoph Hellwig 1238f46b5a66SChristoph Hellwig switch (cmd) { 12396cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 12406cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 12416cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 12426cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 12436cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 12446cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1245f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 12464bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 12473de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 12484bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 1249f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1250f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1251f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 12524bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1253f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 12544bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1255f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 12564bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1257f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1258f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1259f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1260c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1261c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 12627a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1263f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1264f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1265f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1266f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1267f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1268f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1269f46b5a66SChristoph Hellwig return 0; 1270f46b5a66SChristoph Hellwig } 1271f46b5a66SChristoph Hellwig 1272f46b5a66SChristoph Hellwig return -ENOTTY; 1273f46b5a66SChristoph Hellwig } 1274