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 2419ed74f2dSJosef Bacik /* 2429ed74f2dSJosef Bacik * 1 - inode item 2439ed74f2dSJosef Bacik * 2 - refs 2449ed74f2dSJosef Bacik * 1 - root item 2459ed74f2dSJosef Bacik * 2 - dir items 2469ed74f2dSJosef Bacik */ 2479ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 248f46b5a66SChristoph Hellwig if (ret) 24976dda93cSYan, Zheng return ret; 250f46b5a66SChristoph Hellwig 251f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 252f46b5a66SChristoph Hellwig BUG_ON(!trans); 253f46b5a66SChristoph Hellwig 254f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 255f46b5a66SChristoph Hellwig 0, &objectid); 256f46b5a66SChristoph Hellwig if (ret) 257f46b5a66SChristoph Hellwig goto fail; 258f46b5a66SChristoph Hellwig 2595d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2605d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2618e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2628e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2638e8a1e31SJosef Bacik goto fail; 2648e8a1e31SJosef Bacik } 265f46b5a66SChristoph Hellwig 2665d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 267f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 268f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2695d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 270f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 271f46b5a66SChristoph Hellwig 272f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 273f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 274f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2755d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2765d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2775d4f98a2SYan Zheng BTRFS_UUID_SIZE); 278f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 279f46b5a66SChristoph Hellwig 280f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 281f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 282f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 283f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 284f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 285a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 286f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 287f46b5a66SChristoph Hellwig 288f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28984234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 290f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 291f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29286b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29380ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 294f46b5a66SChristoph Hellwig 295f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 296f46b5a66SChristoph Hellwig root_item.drop_level = 0; 297f46b5a66SChristoph Hellwig 298925baeddSChris Mason btrfs_tree_unlock(leaf); 299f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 300f46b5a66SChristoph Hellwig leaf = NULL; 301f46b5a66SChristoph Hellwig 302f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 303f46b5a66SChristoph Hellwig 304f46b5a66SChristoph Hellwig key.objectid = objectid; 3055d4f98a2SYan Zheng key.offset = 0; 306f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 307f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 308f46b5a66SChristoph Hellwig &root_item); 309f46b5a66SChristoph Hellwig if (ret) 310f46b5a66SChristoph Hellwig goto fail; 311f46b5a66SChristoph Hellwig 31276dda93cSYan, Zheng key.offset = (u64)-1; 31376dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31476dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31576dda93cSYan, Zheng 31676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31776dda93cSYan, Zheng 31876dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 31976dda93cSYan, Zheng BTRFS_I(dir)->block_group); 320f46b5a66SChristoph Hellwig /* 321f46b5a66SChristoph Hellwig * insert the directory item 322f46b5a66SChristoph Hellwig */ 3233de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3243de4586cSChris Mason BUG_ON(ret); 3253de4586cSChris Mason 3263de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 327f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3283de4586cSChris Mason BTRFS_FT_DIR, index); 329f46b5a66SChristoph Hellwig if (ret) 330f46b5a66SChristoph Hellwig goto fail; 3310660b5afSChris Mason 33252c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33452c26179SYan Zheng BUG_ON(ret); 33552c26179SYan Zheng 3360660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3374df27c4dSYan, Zheng objectid, root->root_key.objectid, 3380660b5afSChris Mason dir->i_ino, index, name, namelen); 33976dda93cSYan, Zheng 3400660b5afSChris Mason BUG_ON(ret); 3410660b5afSChris Mason 34276dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 343f46b5a66SChristoph Hellwig fail: 34476dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 345f46b5a66SChristoph Hellwig if (err && !ret) 346f46b5a66SChristoph Hellwig ret = err; 3479ed74f2dSJosef Bacik 3489ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 349f46b5a66SChristoph Hellwig return ret; 350f46b5a66SChristoph Hellwig } 351f46b5a66SChristoph Hellwig 3523de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3533de4586cSChris Mason char *name, int namelen) 354f46b5a66SChristoph Hellwig { 3552e4bfab9SYan, Zheng struct inode *inode; 356f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 357f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3582e4bfab9SYan, Zheng int ret; 359f46b5a66SChristoph Hellwig 360f46b5a66SChristoph Hellwig if (!root->ref_cows) 361f46b5a66SChristoph Hellwig return -EINVAL; 362f46b5a66SChristoph Hellwig 3639ed74f2dSJosef Bacik /* 3649ed74f2dSJosef Bacik * 1 - inode item 3659ed74f2dSJosef Bacik * 2 - refs 3669ed74f2dSJosef Bacik * 1 - root item 3679ed74f2dSJosef Bacik * 2 - dir items 3689ed74f2dSJosef Bacik */ 3699ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 370f46b5a66SChristoph Hellwig if (ret) 3712e4bfab9SYan, Zheng goto fail; 372f46b5a66SChristoph Hellwig 3733de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 374f46b5a66SChristoph Hellwig if (!pending_snapshot) { 375f46b5a66SChristoph Hellwig ret = -ENOMEM; 3769ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3772e4bfab9SYan, Zheng goto fail; 378f46b5a66SChristoph Hellwig } 379f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 380f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 381f46b5a66SChristoph Hellwig ret = -ENOMEM; 382f46b5a66SChristoph Hellwig kfree(pending_snapshot); 3839ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3842e4bfab9SYan, Zheng goto fail; 385f46b5a66SChristoph Hellwig } 386f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 387f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3883de4586cSChris Mason pending_snapshot->dentry = dentry; 389f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 390f46b5a66SChristoph Hellwig BUG_ON(!trans); 391f46b5a66SChristoph Hellwig pending_snapshot->root = root; 392f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 393f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 3942e4bfab9SYan, Zheng ret = btrfs_commit_transaction(trans, root); 3952e4bfab9SYan, Zheng BUG_ON(ret); 3962e4bfab9SYan, Zheng btrfs_unreserve_metadata_space(root, 6); 397f46b5a66SChristoph Hellwig 3982e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 3992e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4002e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4012e4bfab9SYan, Zheng goto fail; 4022e4bfab9SYan, Zheng } 4032e4bfab9SYan, Zheng BUG_ON(!inode); 4042e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4052e4bfab9SYan, Zheng ret = 0; 4062e4bfab9SYan, Zheng fail: 407f46b5a66SChristoph Hellwig return ret; 408f46b5a66SChristoph Hellwig } 409f46b5a66SChristoph Hellwig 410cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 411cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 412cb8e7090SChristoph Hellwig { 413cb8e7090SChristoph Hellwig if (child->d_inode) 414cb8e7090SChristoph Hellwig return -EEXIST; 415cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 416cb8e7090SChristoph Hellwig return -ENOENT; 417cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 418cb8e7090SChristoph Hellwig } 419cb8e7090SChristoph Hellwig 420cb8e7090SChristoph Hellwig /* 421cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 422cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 423cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 424cb8e7090SChristoph Hellwig */ 42576dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 42676dda93cSYan, Zheng char *name, int namelen, 4273de4586cSChris Mason struct btrfs_root *snap_src) 428cb8e7090SChristoph Hellwig { 42976dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 430cb8e7090SChristoph Hellwig struct dentry *dentry; 431cb8e7090SChristoph Hellwig int error; 432cb8e7090SChristoph Hellwig 43376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 434cb8e7090SChristoph Hellwig 435cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 436cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 437cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 438cb8e7090SChristoph Hellwig goto out_unlock; 439cb8e7090SChristoph Hellwig 440cb8e7090SChristoph Hellwig error = -EEXIST; 441cb8e7090SChristoph Hellwig if (dentry->d_inode) 442cb8e7090SChristoph Hellwig goto out_dput; 443cb8e7090SChristoph Hellwig 444cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 445cb8e7090SChristoph Hellwig if (error) 446cb8e7090SChristoph Hellwig goto out_dput; 447cb8e7090SChristoph Hellwig 44876dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 449cb8e7090SChristoph Hellwig if (error) 450cb8e7090SChristoph Hellwig goto out_drop_write; 451cb8e7090SChristoph Hellwig 45276dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 45376dda93cSYan, Zheng 45476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 45576dda93cSYan, Zheng goto out_up_read; 45676dda93cSYan, Zheng 4573de4586cSChris Mason if (snap_src) { 45876dda93cSYan, Zheng error = create_snapshot(snap_src, dentry, 45976dda93cSYan, Zheng name, namelen); 4603de4586cSChris Mason } else { 46176dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 46276dda93cSYan, Zheng name, namelen); 4633de4586cSChris Mason } 46476dda93cSYan, Zheng if (!error) 46576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 46676dda93cSYan, Zheng out_up_read: 46776dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 468cb8e7090SChristoph Hellwig out_drop_write: 469cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 470cb8e7090SChristoph Hellwig out_dput: 471cb8e7090SChristoph Hellwig dput(dentry); 472cb8e7090SChristoph Hellwig out_unlock: 47376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 474cb8e7090SChristoph Hellwig return error; 475cb8e7090SChristoph Hellwig } 476cb8e7090SChristoph Hellwig 477940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 4781e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 4791e701a32SChris Mason u64 *defrag_end) 480940100a4SChris Mason { 481940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 482940100a4SChris Mason struct extent_map *em = NULL; 483940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 484940100a4SChris Mason int ret = 1; 485940100a4SChris Mason 4861e701a32SChris Mason 4871e701a32SChris Mason if (thresh == 0) 4881e701a32SChris Mason thresh = 256 * 1024; 4891e701a32SChris Mason 490940100a4SChris Mason /* 491940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 492940100a4SChris Mason * defragging it 493940100a4SChris Mason */ 494940100a4SChris Mason if (start < *defrag_end) 495940100a4SChris Mason return 1; 496940100a4SChris Mason 497940100a4SChris Mason *skip = 0; 498940100a4SChris Mason 499940100a4SChris Mason /* 500940100a4SChris Mason * hopefully we have this extent in the tree already, try without 501940100a4SChris Mason * the full extent lock 502940100a4SChris Mason */ 503940100a4SChris Mason read_lock(&em_tree->lock); 504940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 505940100a4SChris Mason read_unlock(&em_tree->lock); 506940100a4SChris Mason 507940100a4SChris Mason if (!em) { 508940100a4SChris Mason /* get the big lock and read metadata off disk */ 509940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 510940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 511940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 512940100a4SChris Mason 513940100a4SChris Mason if (!em) 514940100a4SChris Mason return 0; 515940100a4SChris Mason } 516940100a4SChris Mason 517940100a4SChris Mason /* this will cover holes, and inline extents */ 518940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 519940100a4SChris Mason ret = 0; 520940100a4SChris Mason 521940100a4SChris Mason /* 522940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 523940100a4SChris Mason */ 5241e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 525940100a4SChris Mason ret = 0; 526940100a4SChris Mason 527940100a4SChris Mason /* 528940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 529940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 530940100a4SChris Mason * so that the next tiny extent will force a defrag. 531940100a4SChris Mason * 532940100a4SChris Mason * The end result of this is that tiny extents before a single big 533940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 534940100a4SChris Mason */ 535940100a4SChris Mason if (ret) { 536940100a4SChris Mason *last_len += len; 537940100a4SChris Mason *defrag_end = extent_map_end(em); 538940100a4SChris Mason } else { 539940100a4SChris Mason *last_len = 0; 540940100a4SChris Mason *skip = extent_map_end(em); 541940100a4SChris Mason *defrag_end = 0; 542940100a4SChris Mason } 543940100a4SChris Mason 544940100a4SChris Mason free_extent_map(em); 545940100a4SChris Mason return ret; 546940100a4SChris Mason } 547940100a4SChris Mason 5481e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 5491e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 550f46b5a66SChristoph Hellwig { 551f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 552f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 553f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5543eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 555f46b5a66SChristoph Hellwig struct page *page; 556f46b5a66SChristoph Hellwig unsigned long last_index; 557f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 558f46b5a66SChristoph Hellwig unsigned long total_read = 0; 559f46b5a66SChristoph Hellwig u64 page_start; 560f46b5a66SChristoph Hellwig u64 page_end; 561940100a4SChris Mason u64 last_len = 0; 562940100a4SChris Mason u64 skip = 0; 563940100a4SChris Mason u64 defrag_end = 0; 564f46b5a66SChristoph Hellwig unsigned long i; 565f46b5a66SChristoph Hellwig int ret; 566f46b5a66SChristoph Hellwig 567940100a4SChris Mason if (inode->i_size == 0) 568940100a4SChris Mason return 0; 569f46b5a66SChristoph Hellwig 5701e701a32SChris Mason if (range->start + range->len > range->start) { 5711e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 5721e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 5731e701a32SChris Mason } else { 574940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 5751e701a32SChris Mason } 5761e701a32SChris Mason 5771e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 578940100a4SChris Mason while (i <= last_index) { 579940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 5801e701a32SChris Mason PAGE_CACHE_SIZE, 5811e701a32SChris Mason range->extent_thresh, 5821e701a32SChris Mason &last_len, &skip, 583940100a4SChris Mason &defrag_end)) { 584940100a4SChris Mason unsigned long next; 585940100a4SChris Mason /* 586940100a4SChris Mason * the should_defrag function tells us how much to skip 587940100a4SChris Mason * bump our counter by the suggested amount 588940100a4SChris Mason */ 589940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 590940100a4SChris Mason i = max(i + 1, next); 591940100a4SChris Mason continue; 592940100a4SChris Mason } 593940100a4SChris Mason 594f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 595f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 596f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 597f46b5a66SChristoph Hellwig } 598f46b5a66SChristoph Hellwig total_read++; 599940100a4SChris Mason mutex_lock(&inode->i_mutex); 6001e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6011e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 602940100a4SChris Mason 603940100a4SChris Mason ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); 604940100a4SChris Mason if (ret) { 605940100a4SChris Mason ret = -ENOSPC; 606940100a4SChris Mason break; 607940100a4SChris Mason } 608940100a4SChris Mason 609940100a4SChris Mason ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); 610940100a4SChris Mason if (ret) { 611940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 612940100a4SChris Mason PAGE_CACHE_SIZE); 613940100a4SChris Mason ret = -ENOSPC; 614940100a4SChris Mason break; 615940100a4SChris Mason } 6163eaa2885SChris Mason again: 617940100a4SChris Mason if (inode->i_size == 0 || 618940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 619940100a4SChris Mason ret = 0; 620940100a4SChris Mason goto err_reservations; 621940100a4SChris Mason } 622940100a4SChris Mason 623f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 624f46b5a66SChristoph Hellwig if (!page) 625940100a4SChris Mason goto err_reservations; 626940100a4SChris Mason 627f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 628f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 629f46b5a66SChristoph Hellwig lock_page(page); 630f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 631f46b5a66SChristoph Hellwig unlock_page(page); 632f46b5a66SChristoph Hellwig page_cache_release(page); 633940100a4SChris Mason goto err_reservations; 634f46b5a66SChristoph Hellwig } 635f46b5a66SChristoph Hellwig } 636f46b5a66SChristoph Hellwig 637940100a4SChris Mason if (page->mapping != inode->i_mapping) { 638940100a4SChris Mason unlock_page(page); 639940100a4SChris Mason page_cache_release(page); 640940100a4SChris Mason goto again; 641940100a4SChris Mason } 642940100a4SChris Mason 643f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 644f46b5a66SChristoph Hellwig 645940100a4SChris Mason if (PageDirty(page)) { 646940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 647940100a4SChris Mason PAGE_CACHE_SIZE); 648940100a4SChris Mason goto loop_unlock; 649940100a4SChris Mason } 650940100a4SChris Mason 651f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 652f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 653f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 6543eaa2885SChris Mason 6553eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 6563eaa2885SChris Mason if (ordered) { 6573eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 6583eaa2885SChris Mason unlock_page(page); 6593eaa2885SChris Mason page_cache_release(page); 6603eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 6613eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 6623eaa2885SChris Mason goto again; 6633eaa2885SChris Mason } 6643eaa2885SChris Mason set_page_extent_mapped(page); 6653eaa2885SChris Mason 666f87f057bSChris Mason /* 667f87f057bSChris Mason * this makes sure page_mkwrite is called on the 668f87f057bSChris Mason * page if it is dirtied again later 669f87f057bSChris Mason */ 670f87f057bSChris Mason clear_page_dirty_for_io(page); 671940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 672940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 673940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 674f87f057bSChris Mason 6752ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 676940100a4SChris Mason ClearPageChecked(page); 677f46b5a66SChristoph Hellwig set_page_dirty(page); 678a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 679940100a4SChris Mason 680940100a4SChris Mason loop_unlock: 681f46b5a66SChristoph Hellwig unlock_page(page); 682f46b5a66SChristoph Hellwig page_cache_release(page); 683940100a4SChris Mason mutex_unlock(&inode->i_mutex); 684940100a4SChris Mason 685940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 686f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 687940100a4SChris Mason i++; 688f46b5a66SChristoph Hellwig } 689f46b5a66SChristoph Hellwig 6901e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 6911e701a32SChris Mason filemap_flush(inode->i_mapping); 6921e701a32SChris Mason 6931e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 6941e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 6951e701a32SChris Mason * we have to make sure the IO is actually started and that 6961e701a32SChris Mason * ordered extents get created before we return 6971e701a32SChris Mason */ 6981e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 6991e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7001e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7011e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7021e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7031e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7041e701a32SChris Mason } 7051e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7061e701a32SChris Mason 7071e701a32SChris Mason mutex_lock(&inode->i_mutex); 7081e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7091e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7101e701a32SChris Mason } 7111e701a32SChris Mason 712f46b5a66SChristoph Hellwig return 0; 713940100a4SChris Mason 714940100a4SChris Mason err_reservations: 715940100a4SChris Mason mutex_unlock(&inode->i_mutex); 716940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); 717940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 718940100a4SChris Mason return ret; 719f46b5a66SChristoph Hellwig } 720f46b5a66SChristoph Hellwig 72176dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 72276dda93cSYan, Zheng void __user *arg) 723f46b5a66SChristoph Hellwig { 724f46b5a66SChristoph Hellwig u64 new_size; 725f46b5a66SChristoph Hellwig u64 old_size; 726f46b5a66SChristoph Hellwig u64 devid = 1; 727f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 728f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 729f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 730f46b5a66SChristoph Hellwig char *sizestr; 731f46b5a66SChristoph Hellwig char *devstr = NULL; 732f46b5a66SChristoph Hellwig int ret = 0; 733f46b5a66SChristoph Hellwig int namelen; 734f46b5a66SChristoph Hellwig int mod = 0; 735f46b5a66SChristoph Hellwig 736c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 737c146afadSYan Zheng return -EROFS; 738c146afadSYan Zheng 739e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 740e441d54dSChris Mason return -EPERM; 741e441d54dSChris Mason 742dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 743dae7b665SLi Zefan if (IS_ERR(vol_args)) 744dae7b665SLi Zefan return PTR_ERR(vol_args); 7455516e595SMark Fasheh 7465516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 747f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 748f46b5a66SChristoph Hellwig 7497d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 750f46b5a66SChristoph Hellwig sizestr = vol_args->name; 751f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 752f46b5a66SChristoph Hellwig if (devstr) { 753f46b5a66SChristoph Hellwig char *end; 754f46b5a66SChristoph Hellwig sizestr = devstr + 1; 755f46b5a66SChristoph Hellwig *devstr = '\0'; 756f46b5a66SChristoph Hellwig devstr = vol_args->name; 757f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 75821380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 75921380931SJoel Becker (unsigned long long)devid); 760f46b5a66SChristoph Hellwig } 7612b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 762f46b5a66SChristoph Hellwig if (!device) { 76321380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 76421380931SJoel Becker (unsigned long long)devid); 765f46b5a66SChristoph Hellwig ret = -EINVAL; 766f46b5a66SChristoph Hellwig goto out_unlock; 767f46b5a66SChristoph Hellwig } 768f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 769f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 770f46b5a66SChristoph Hellwig else { 771f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 772f46b5a66SChristoph Hellwig mod = -1; 773f46b5a66SChristoph Hellwig sizestr++; 774f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 775f46b5a66SChristoph Hellwig mod = 1; 776f46b5a66SChristoph Hellwig sizestr++; 777f46b5a66SChristoph Hellwig } 77891748467SAkinobu Mita new_size = memparse(sizestr, NULL); 779f46b5a66SChristoph Hellwig if (new_size == 0) { 780f46b5a66SChristoph Hellwig ret = -EINVAL; 781f46b5a66SChristoph Hellwig goto out_unlock; 782f46b5a66SChristoph Hellwig } 783f46b5a66SChristoph Hellwig } 784f46b5a66SChristoph Hellwig 785f46b5a66SChristoph Hellwig old_size = device->total_bytes; 786f46b5a66SChristoph Hellwig 787f46b5a66SChristoph Hellwig if (mod < 0) { 788f46b5a66SChristoph Hellwig if (new_size > old_size) { 789f46b5a66SChristoph Hellwig ret = -EINVAL; 790f46b5a66SChristoph Hellwig goto out_unlock; 791f46b5a66SChristoph Hellwig } 792f46b5a66SChristoph Hellwig new_size = old_size - new_size; 793f46b5a66SChristoph Hellwig } else if (mod > 0) { 794f46b5a66SChristoph Hellwig new_size = old_size + new_size; 795f46b5a66SChristoph Hellwig } 796f46b5a66SChristoph Hellwig 797f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 798f46b5a66SChristoph Hellwig ret = -EINVAL; 799f46b5a66SChristoph Hellwig goto out_unlock; 800f46b5a66SChristoph Hellwig } 801f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 802f46b5a66SChristoph Hellwig ret = -EFBIG; 803f46b5a66SChristoph Hellwig goto out_unlock; 804f46b5a66SChristoph Hellwig } 805f46b5a66SChristoph Hellwig 806f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 807f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 808f46b5a66SChristoph Hellwig 809f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 810f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 811f46b5a66SChristoph Hellwig 812f46b5a66SChristoph Hellwig if (new_size > old_size) { 813f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 814f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 815f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 816f46b5a66SChristoph Hellwig } else { 817f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 818f46b5a66SChristoph Hellwig } 819f46b5a66SChristoph Hellwig 820f46b5a66SChristoph Hellwig out_unlock: 8217d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 822f46b5a66SChristoph Hellwig kfree(vol_args); 823f46b5a66SChristoph Hellwig return ret; 824f46b5a66SChristoph Hellwig } 825f46b5a66SChristoph Hellwig 826cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 8273de4586cSChris Mason void __user *arg, int subvol) 828f46b5a66SChristoph Hellwig { 829cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 830f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 8313de4586cSChris Mason struct file *src_file; 832f46b5a66SChristoph Hellwig int namelen; 8333de4586cSChris Mason int ret = 0; 834f46b5a66SChristoph Hellwig 835c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 836c146afadSYan Zheng return -EROFS; 837c146afadSYan Zheng 838dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 839dae7b665SLi Zefan if (IS_ERR(vol_args)) 840dae7b665SLi Zefan return PTR_ERR(vol_args); 841f46b5a66SChristoph Hellwig 8425516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 843f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 844f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 845f46b5a66SChristoph Hellwig ret = -EINVAL; 846f46b5a66SChristoph Hellwig goto out; 847f46b5a66SChristoph Hellwig } 848f46b5a66SChristoph Hellwig 8493de4586cSChris Mason if (subvol) { 85076dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 85176dda93cSYan, Zheng NULL); 852cb8e7090SChristoph Hellwig } else { 8533de4586cSChris Mason struct inode *src_inode; 8543de4586cSChris Mason src_file = fget(vol_args->fd); 8553de4586cSChris Mason if (!src_file) { 8563de4586cSChris Mason ret = -EINVAL; 8573de4586cSChris Mason goto out; 8583de4586cSChris Mason } 8593de4586cSChris Mason 8603de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 8613de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 862d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 863d397712bSChris Mason "another FS\n"); 8643de4586cSChris Mason ret = -EINVAL; 8653de4586cSChris Mason fput(src_file); 8663de4586cSChris Mason goto out; 8673de4586cSChris Mason } 86876dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 86976dda93cSYan, Zheng BTRFS_I(src_inode)->root); 8703de4586cSChris Mason fput(src_file); 871cb8e7090SChristoph Hellwig } 872f46b5a66SChristoph Hellwig out: 873f46b5a66SChristoph Hellwig kfree(vol_args); 874f46b5a66SChristoph Hellwig return ret; 875f46b5a66SChristoph Hellwig } 876f46b5a66SChristoph Hellwig 87776dda93cSYan, Zheng /* 87876dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 87976dda93cSYan, Zheng */ 88076dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 88176dda93cSYan, Zheng { 88276dda93cSYan, Zheng struct btrfs_path *path; 88376dda93cSYan, Zheng struct btrfs_key key; 88476dda93cSYan, Zheng int ret; 88576dda93cSYan, Zheng 88676dda93cSYan, Zheng path = btrfs_alloc_path(); 88776dda93cSYan, Zheng if (!path) 88876dda93cSYan, Zheng return -ENOMEM; 88976dda93cSYan, Zheng 89076dda93cSYan, Zheng key.objectid = root->root_key.objectid; 89176dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 89276dda93cSYan, Zheng key.offset = (u64)-1; 89376dda93cSYan, Zheng 89476dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 89576dda93cSYan, Zheng &key, path, 0, 0); 89676dda93cSYan, Zheng if (ret < 0) 89776dda93cSYan, Zheng goto out; 89876dda93cSYan, Zheng BUG_ON(ret == 0); 89976dda93cSYan, Zheng 90076dda93cSYan, Zheng ret = 0; 90176dda93cSYan, Zheng if (path->slots[0] > 0) { 90276dda93cSYan, Zheng path->slots[0]--; 90376dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 90476dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 90576dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 90676dda93cSYan, Zheng ret = -ENOTEMPTY; 90776dda93cSYan, Zheng } 90876dda93cSYan, Zheng out: 90976dda93cSYan, Zheng btrfs_free_path(path); 91076dda93cSYan, Zheng return ret; 91176dda93cSYan, Zheng } 91276dda93cSYan, Zheng 913ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 914ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 915ac8e9819SChris Mason { 916abc6e134SChris Mason struct btrfs_key test; 917abc6e134SChris Mason int ret; 918abc6e134SChris Mason 919abc6e134SChris Mason test.objectid = sk->min_objectid; 920abc6e134SChris Mason test.type = sk->min_type; 921abc6e134SChris Mason test.offset = sk->min_offset; 922abc6e134SChris Mason 923abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 924abc6e134SChris Mason if (ret < 0) 925ac8e9819SChris Mason return 0; 926abc6e134SChris Mason 927abc6e134SChris Mason test.objectid = sk->max_objectid; 928abc6e134SChris Mason test.type = sk->max_type; 929abc6e134SChris Mason test.offset = sk->max_offset; 930abc6e134SChris Mason 931abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 932abc6e134SChris Mason if (ret > 0) 933ac8e9819SChris Mason return 0; 934ac8e9819SChris Mason return 1; 935ac8e9819SChris Mason } 936ac8e9819SChris Mason 937ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 938ac8e9819SChris Mason struct btrfs_path *path, 939ac8e9819SChris Mason struct btrfs_key *key, 940ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 941ac8e9819SChris Mason char *buf, 942ac8e9819SChris Mason unsigned long *sk_offset, 943ac8e9819SChris Mason int *num_found) 944ac8e9819SChris Mason { 945ac8e9819SChris Mason u64 found_transid; 946ac8e9819SChris Mason struct extent_buffer *leaf; 947ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 948ac8e9819SChris Mason unsigned long item_off; 949ac8e9819SChris Mason unsigned long item_len; 950ac8e9819SChris Mason int nritems; 951ac8e9819SChris Mason int i; 952ac8e9819SChris Mason int slot; 953ac8e9819SChris Mason int found = 0; 954ac8e9819SChris Mason int ret = 0; 955ac8e9819SChris Mason 956ac8e9819SChris Mason leaf = path->nodes[0]; 957ac8e9819SChris Mason slot = path->slots[0]; 958ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 959ac8e9819SChris Mason 960ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 961ac8e9819SChris Mason i = nritems; 962ac8e9819SChris Mason goto advance_key; 963ac8e9819SChris Mason } 964ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 965ac8e9819SChris Mason 966ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 967ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 968ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 969ac8e9819SChris Mason 970ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 971ac8e9819SChris Mason item_len = 0; 972ac8e9819SChris Mason 973ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 974ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 975ac8e9819SChris Mason ret = 1; 976ac8e9819SChris Mason goto overflow; 977ac8e9819SChris Mason } 978ac8e9819SChris Mason 979ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 980ac8e9819SChris Mason if (!key_in_sk(key, sk)) 981ac8e9819SChris Mason continue; 982ac8e9819SChris Mason 983ac8e9819SChris Mason sh.objectid = key->objectid; 984ac8e9819SChris Mason sh.offset = key->offset; 985ac8e9819SChris Mason sh.type = key->type; 986ac8e9819SChris Mason sh.len = item_len; 987ac8e9819SChris Mason sh.transid = found_transid; 988ac8e9819SChris Mason 989ac8e9819SChris Mason /* copy search result header */ 990ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 991ac8e9819SChris Mason *sk_offset += sizeof(sh); 992ac8e9819SChris Mason 993ac8e9819SChris Mason if (item_len) { 994ac8e9819SChris Mason char *p = buf + *sk_offset; 995ac8e9819SChris Mason /* copy the item */ 996ac8e9819SChris Mason read_extent_buffer(leaf, p, 997ac8e9819SChris Mason item_off, item_len); 998ac8e9819SChris Mason *sk_offset += item_len; 999ac8e9819SChris Mason } 100090fdde14SChris Mason found++; 1001ac8e9819SChris Mason 1002ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1003ac8e9819SChris Mason break; 1004ac8e9819SChris Mason } 1005ac8e9819SChris Mason advance_key: 1006ac8e9819SChris Mason ret = 0; 1007abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1008abc6e134SChris Mason key->offset++; 1009abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1010abc6e134SChris Mason key->offset = 0; 1011abc6e134SChris Mason key->type++; 1012abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1013abc6e134SChris Mason key->offset = 0; 1014abc6e134SChris Mason key->type = 0; 1015abc6e134SChris Mason key->objectid++; 1016abc6e134SChris Mason } else 1017abc6e134SChris Mason ret = 1; 1018ac8e9819SChris Mason overflow: 1019ac8e9819SChris Mason *num_found += found; 1020ac8e9819SChris Mason return ret; 1021ac8e9819SChris Mason } 1022ac8e9819SChris Mason 1023ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1024ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1025ac8e9819SChris Mason { 1026ac8e9819SChris Mason struct btrfs_root *root; 1027ac8e9819SChris Mason struct btrfs_key key; 1028ac8e9819SChris Mason struct btrfs_key max_key; 1029ac8e9819SChris Mason struct btrfs_path *path; 1030ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1031ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1032ac8e9819SChris Mason int ret; 1033ac8e9819SChris Mason int num_found = 0; 1034ac8e9819SChris Mason unsigned long sk_offset = 0; 1035ac8e9819SChris Mason 1036ac8e9819SChris Mason path = btrfs_alloc_path(); 1037ac8e9819SChris Mason if (!path) 1038ac8e9819SChris Mason return -ENOMEM; 1039ac8e9819SChris Mason 1040ac8e9819SChris Mason if (sk->tree_id == 0) { 1041ac8e9819SChris Mason /* search the root of the inode that was passed */ 1042ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1043ac8e9819SChris Mason } else { 1044ac8e9819SChris Mason key.objectid = sk->tree_id; 1045ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1046ac8e9819SChris Mason key.offset = (u64)-1; 1047ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1048ac8e9819SChris Mason if (IS_ERR(root)) { 1049ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1050ac8e9819SChris Mason sk->tree_id); 1051ac8e9819SChris Mason btrfs_free_path(path); 1052ac8e9819SChris Mason return -ENOENT; 1053ac8e9819SChris Mason } 1054ac8e9819SChris Mason } 1055ac8e9819SChris Mason 1056ac8e9819SChris Mason key.objectid = sk->min_objectid; 1057ac8e9819SChris Mason key.type = sk->min_type; 1058ac8e9819SChris Mason key.offset = sk->min_offset; 1059ac8e9819SChris Mason 1060ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1061ac8e9819SChris Mason max_key.type = sk->max_type; 1062ac8e9819SChris Mason max_key.offset = sk->max_offset; 1063ac8e9819SChris Mason 1064ac8e9819SChris Mason path->keep_locks = 1; 1065ac8e9819SChris Mason 1066ac8e9819SChris Mason while(1) { 1067ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1068ac8e9819SChris Mason sk->min_transid); 1069ac8e9819SChris Mason if (ret != 0) { 1070ac8e9819SChris Mason if (ret > 0) 1071ac8e9819SChris Mason ret = 0; 1072ac8e9819SChris Mason goto err; 1073ac8e9819SChris Mason } 1074ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1075ac8e9819SChris Mason &sk_offset, &num_found); 1076ac8e9819SChris Mason btrfs_release_path(root, path); 1077ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1078ac8e9819SChris Mason break; 1079ac8e9819SChris Mason 1080ac8e9819SChris Mason } 1081ac8e9819SChris Mason ret = 0; 1082ac8e9819SChris Mason err: 1083ac8e9819SChris Mason sk->nr_items = num_found; 1084ac8e9819SChris Mason btrfs_free_path(path); 1085ac8e9819SChris Mason return ret; 1086ac8e9819SChris Mason } 1087ac8e9819SChris Mason 1088ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1089ac8e9819SChris Mason void __user *argp) 1090ac8e9819SChris Mason { 1091ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1092ac8e9819SChris Mason struct inode *inode; 1093ac8e9819SChris Mason int ret; 1094ac8e9819SChris Mason 1095ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1096ac8e9819SChris Mason return -EPERM; 1097ac8e9819SChris Mason 1098ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1099ac8e9819SChris Mason if (!args) 1100ac8e9819SChris Mason return -ENOMEM; 1101ac8e9819SChris Mason 1102ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1103ac8e9819SChris Mason kfree(args); 1104ac8e9819SChris Mason return -EFAULT; 1105ac8e9819SChris Mason } 1106ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1107ac8e9819SChris Mason ret = search_ioctl(inode, args); 1108ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1109ac8e9819SChris Mason ret = -EFAULT; 1110ac8e9819SChris Mason kfree(args); 1111ac8e9819SChris Mason return ret; 1112ac8e9819SChris Mason } 1113ac8e9819SChris Mason 111498d377a0STARUISI Hiroaki /* 1115ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1116ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 111798d377a0STARUISI Hiroaki */ 111898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 111998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 112098d377a0STARUISI Hiroaki { 112198d377a0STARUISI Hiroaki struct btrfs_root *root; 112298d377a0STARUISI Hiroaki struct btrfs_key key; 1123ac8e9819SChris Mason char *ptr; 112498d377a0STARUISI Hiroaki int ret = -1; 112598d377a0STARUISI Hiroaki int slot; 112698d377a0STARUISI Hiroaki int len; 112798d377a0STARUISI Hiroaki int total_len = 0; 112898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 112998d377a0STARUISI Hiroaki struct extent_buffer *l; 113098d377a0STARUISI Hiroaki struct btrfs_path *path; 113198d377a0STARUISI Hiroaki 113298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 113398d377a0STARUISI Hiroaki name[0]='\0'; 113498d377a0STARUISI Hiroaki return 0; 113598d377a0STARUISI Hiroaki } 113698d377a0STARUISI Hiroaki 113798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 113898d377a0STARUISI Hiroaki if (!path) 113998d377a0STARUISI Hiroaki return -ENOMEM; 114098d377a0STARUISI Hiroaki 1141ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 114298d377a0STARUISI Hiroaki 114398d377a0STARUISI Hiroaki key.objectid = tree_id; 114498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 114598d377a0STARUISI Hiroaki key.offset = (u64)-1; 114698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 114798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 114898d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 11498ad6fcabSChris Mason ret = -ENOENT; 11508ad6fcabSChris Mason goto out; 115198d377a0STARUISI Hiroaki } 115298d377a0STARUISI Hiroaki 115398d377a0STARUISI Hiroaki key.objectid = dirid; 115498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 11558ad6fcabSChris Mason key.offset = (u64)-1; 115698d377a0STARUISI Hiroaki 115798d377a0STARUISI Hiroaki while(1) { 115898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 115998d377a0STARUISI Hiroaki if (ret < 0) 116098d377a0STARUISI Hiroaki goto out; 116198d377a0STARUISI Hiroaki 116298d377a0STARUISI Hiroaki l = path->nodes[0]; 116398d377a0STARUISI Hiroaki slot = path->slots[0]; 11648ad6fcabSChris Mason if (ret > 0 && slot > 0) 11658ad6fcabSChris Mason slot--; 116698d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 116798d377a0STARUISI Hiroaki 116898d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1169ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1170ac8e9819SChris Mason ret = -ENOENT; 117198d377a0STARUISI Hiroaki goto out; 1172ac8e9819SChris Mason } 117398d377a0STARUISI Hiroaki 117498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 117598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 117698d377a0STARUISI Hiroaki ptr -= len + 1; 117798d377a0STARUISI Hiroaki total_len += len + 1; 1178ac8e9819SChris Mason if (ptr < name) 117998d377a0STARUISI Hiroaki goto out; 118098d377a0STARUISI Hiroaki 118198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 118298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 118398d377a0STARUISI Hiroaki 118498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 118598d377a0STARUISI Hiroaki break; 118698d377a0STARUISI Hiroaki 118798d377a0STARUISI Hiroaki btrfs_release_path(root, path); 118898d377a0STARUISI Hiroaki key.objectid = key.offset; 11898ad6fcabSChris Mason key.offset = (u64)-1; 119098d377a0STARUISI Hiroaki dirid = key.objectid; 119198d377a0STARUISI Hiroaki 119298d377a0STARUISI Hiroaki } 1193ac8e9819SChris Mason if (ptr < name) 119498d377a0STARUISI Hiroaki goto out; 1195ac8e9819SChris Mason memcpy(name, ptr, total_len); 119698d377a0STARUISI Hiroaki name[total_len]='\0'; 119798d377a0STARUISI Hiroaki ret = 0; 119898d377a0STARUISI Hiroaki out: 119998d377a0STARUISI Hiroaki btrfs_free_path(path); 1200ac8e9819SChris Mason return ret; 1201ac8e9819SChris Mason } 1202ac8e9819SChris Mason 1203ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1204ac8e9819SChris Mason void __user *argp) 1205ac8e9819SChris Mason { 1206ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1207ac8e9819SChris Mason struct inode *inode; 1208ac8e9819SChris Mason int ret; 1209ac8e9819SChris Mason 1210ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1211ac8e9819SChris Mason return -EPERM; 1212ac8e9819SChris Mason 1213ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1214c2b96929SDan Carpenter if (!args) 1215c2b96929SDan Carpenter return -ENOMEM; 1216c2b96929SDan Carpenter 1217ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1218ac8e9819SChris Mason kfree(args); 1219ac8e9819SChris Mason return -EFAULT; 1220ac8e9819SChris Mason } 1221ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1222ac8e9819SChris Mason 12231b53ac4dSChris Mason if (args->treeid == 0) 12241b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 12251b53ac4dSChris Mason 1226ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1227ac8e9819SChris Mason args->treeid, args->objectid, 1228ac8e9819SChris Mason args->name); 1229ac8e9819SChris Mason 1230ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1231ac8e9819SChris Mason ret = -EFAULT; 1232ac8e9819SChris Mason 1233ac8e9819SChris Mason kfree(args); 123498d377a0STARUISI Hiroaki return ret; 123598d377a0STARUISI Hiroaki } 123698d377a0STARUISI Hiroaki 123776dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 123876dda93cSYan, Zheng void __user *arg) 123976dda93cSYan, Zheng { 124076dda93cSYan, Zheng struct dentry *parent = fdentry(file); 124176dda93cSYan, Zheng struct dentry *dentry; 124276dda93cSYan, Zheng struct inode *dir = parent->d_inode; 124376dda93cSYan, Zheng struct inode *inode; 124476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 124576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 124676dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 124776dda93cSYan, Zheng struct btrfs_trans_handle *trans; 124876dda93cSYan, Zheng int namelen; 124976dda93cSYan, Zheng int ret; 125076dda93cSYan, Zheng int err = 0; 125176dda93cSYan, Zheng 125276dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 125376dda93cSYan, Zheng return -EPERM; 125476dda93cSYan, Zheng 125576dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 125676dda93cSYan, Zheng if (IS_ERR(vol_args)) 125776dda93cSYan, Zheng return PTR_ERR(vol_args); 125876dda93cSYan, Zheng 125976dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 126076dda93cSYan, Zheng namelen = strlen(vol_args->name); 126176dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 126276dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 126376dda93cSYan, Zheng err = -EINVAL; 126476dda93cSYan, Zheng goto out; 126576dda93cSYan, Zheng } 126676dda93cSYan, Zheng 126776dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 126876dda93cSYan, Zheng if (err) 126976dda93cSYan, Zheng goto out; 127076dda93cSYan, Zheng 127176dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 127276dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 127376dda93cSYan, Zheng if (IS_ERR(dentry)) { 127476dda93cSYan, Zheng err = PTR_ERR(dentry); 127576dda93cSYan, Zheng goto out_unlock_dir; 127676dda93cSYan, Zheng } 127776dda93cSYan, Zheng 127876dda93cSYan, Zheng if (!dentry->d_inode) { 127976dda93cSYan, Zheng err = -ENOENT; 128076dda93cSYan, Zheng goto out_dput; 128176dda93cSYan, Zheng } 128276dda93cSYan, Zheng 128376dda93cSYan, Zheng inode = dentry->d_inode; 128476dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 128576dda93cSYan, Zheng err = -EINVAL; 128676dda93cSYan, Zheng goto out_dput; 128776dda93cSYan, Zheng } 128876dda93cSYan, Zheng 128976dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 129076dda93cSYan, Zheng 129176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 129276dda93cSYan, Zheng err = d_invalidate(dentry); 129376dda93cSYan, Zheng if (err) 129476dda93cSYan, Zheng goto out_unlock; 129576dda93cSYan, Zheng 129676dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 129776dda93cSYan, Zheng 129876dda93cSYan, Zheng err = may_destroy_subvol(dest); 129976dda93cSYan, Zheng if (err) 130076dda93cSYan, Zheng goto out_up_write; 130176dda93cSYan, Zheng 130276dda93cSYan, Zheng trans = btrfs_start_transaction(root, 1); 130376dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 130476dda93cSYan, Zheng dest->root_key.objectid, 130576dda93cSYan, Zheng dentry->d_name.name, 130676dda93cSYan, Zheng dentry->d_name.len); 130776dda93cSYan, Zheng BUG_ON(ret); 130876dda93cSYan, Zheng 130976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 131076dda93cSYan, Zheng 131176dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 131276dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 131376dda93cSYan, Zheng dest->root_item.drop_level = 0; 131476dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 131576dda93cSYan, Zheng 131676dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 131776dda93cSYan, Zheng root->fs_info->tree_root, 131876dda93cSYan, Zheng dest->root_key.objectid); 131976dda93cSYan, Zheng BUG_ON(ret); 132076dda93cSYan, Zheng 132176dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 132276dda93cSYan, Zheng BUG_ON(ret); 132376dda93cSYan, Zheng inode->i_flags |= S_DEAD; 132476dda93cSYan, Zheng out_up_write: 132576dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 132676dda93cSYan, Zheng out_unlock: 132776dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 132876dda93cSYan, Zheng if (!err) { 1329efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 133076dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 133176dda93cSYan, Zheng d_delete(dentry); 133276dda93cSYan, Zheng } 133376dda93cSYan, Zheng out_dput: 133476dda93cSYan, Zheng dput(dentry); 133576dda93cSYan, Zheng out_unlock_dir: 133676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 133776dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 133876dda93cSYan, Zheng out: 133976dda93cSYan, Zheng kfree(vol_args); 134076dda93cSYan, Zheng return err; 134176dda93cSYan, Zheng } 134276dda93cSYan, Zheng 13431e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1344f46b5a66SChristoph Hellwig { 1345f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1346f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 13471e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1348c146afadSYan Zheng int ret; 1349c146afadSYan Zheng 1350c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1351c146afadSYan Zheng if (ret) 1352c146afadSYan Zheng return ret; 1353f46b5a66SChristoph Hellwig 1354f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1355f46b5a66SChristoph Hellwig case S_IFDIR: 1356e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1357e441d54dSChris Mason ret = -EPERM; 1358e441d54dSChris Mason goto out; 1359e441d54dSChris Mason } 1360f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 1361f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 1362f46b5a66SChristoph Hellwig break; 1363f46b5a66SChristoph Hellwig case S_IFREG: 1364e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1365e441d54dSChris Mason ret = -EINVAL; 1366e441d54dSChris Mason goto out; 1367e441d54dSChris Mason } 13681e701a32SChris Mason 13691e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 13701e701a32SChris Mason if (!range) { 13711e701a32SChris Mason ret = -ENOMEM; 13721e701a32SChris Mason goto out; 13731e701a32SChris Mason } 13741e701a32SChris Mason 13751e701a32SChris Mason if (argp) { 13761e701a32SChris Mason if (copy_from_user(range, argp, 13771e701a32SChris Mason sizeof(*range))) { 13781e701a32SChris Mason ret = -EFAULT; 13791e701a32SChris Mason kfree(range); 1380683be16eSDan Carpenter goto out; 13811e701a32SChris Mason } 13821e701a32SChris Mason /* compression requires us to start the IO */ 13831e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13841e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 13851e701a32SChris Mason range->extent_thresh = (u32)-1; 13861e701a32SChris Mason } 13871e701a32SChris Mason } else { 13881e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 13891e701a32SChris Mason range->len = (u64)-1; 13901e701a32SChris Mason } 13911e701a32SChris Mason btrfs_defrag_file(file, range); 13921e701a32SChris Mason kfree(range); 1393f46b5a66SChristoph Hellwig break; 1394f46b5a66SChristoph Hellwig } 1395e441d54dSChris Mason out: 1396ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1397e441d54dSChris Mason return ret; 1398f46b5a66SChristoph Hellwig } 1399f46b5a66SChristoph Hellwig 1400b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1401f46b5a66SChristoph Hellwig { 1402f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1403f46b5a66SChristoph Hellwig int ret; 1404f46b5a66SChristoph Hellwig 1405e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1406e441d54dSChris Mason return -EPERM; 1407e441d54dSChris Mason 1408dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1409dae7b665SLi Zefan if (IS_ERR(vol_args)) 1410dae7b665SLi Zefan return PTR_ERR(vol_args); 1411f46b5a66SChristoph Hellwig 14125516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1413f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1414f46b5a66SChristoph Hellwig 1415f46b5a66SChristoph Hellwig kfree(vol_args); 1416f46b5a66SChristoph Hellwig return ret; 1417f46b5a66SChristoph Hellwig } 1418f46b5a66SChristoph Hellwig 1419b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1420f46b5a66SChristoph Hellwig { 1421f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1422f46b5a66SChristoph Hellwig int ret; 1423f46b5a66SChristoph Hellwig 1424e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1425e441d54dSChris Mason return -EPERM; 1426e441d54dSChris Mason 1427c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1428c146afadSYan Zheng return -EROFS; 1429c146afadSYan Zheng 1430dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1431dae7b665SLi Zefan if (IS_ERR(vol_args)) 1432dae7b665SLi Zefan return PTR_ERR(vol_args); 1433f46b5a66SChristoph Hellwig 14345516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1435f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1436f46b5a66SChristoph Hellwig 1437f46b5a66SChristoph Hellwig kfree(vol_args); 1438f46b5a66SChristoph Hellwig return ret; 1439f46b5a66SChristoph Hellwig } 1440f46b5a66SChristoph Hellwig 144176dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1442b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1443f46b5a66SChristoph Hellwig { 1444f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1445f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1446f46b5a66SChristoph Hellwig struct file *src_file; 1447f46b5a66SChristoph Hellwig struct inode *src; 1448f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1449f46b5a66SChristoph Hellwig struct btrfs_path *path; 1450f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1451ae01a0abSYan Zheng char *buf; 1452ae01a0abSYan Zheng struct btrfs_key key; 1453f46b5a66SChristoph Hellwig u32 nritems; 1454f46b5a66SChristoph Hellwig int slot; 1455ae01a0abSYan Zheng int ret; 1456c5c9cd4dSSage Weil u64 len = olen; 1457c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1458c5c9cd4dSSage Weil u64 hint_byte; 1459d20f7043SChris Mason 1460c5c9cd4dSSage Weil /* 1461c5c9cd4dSSage Weil * TODO: 1462c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1463c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1464c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1465c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1466c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1467c5c9cd4dSSage Weil * they don't overlap)? 1468c5c9cd4dSSage Weil */ 1469c5c9cd4dSSage Weil 1470e441d54dSChris Mason /* the destination must be opened for writing */ 1471e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 1472e441d54dSChris Mason return -EINVAL; 1473e441d54dSChris Mason 1474c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1475c146afadSYan Zheng if (ret) 1476c146afadSYan Zheng return ret; 1477c146afadSYan Zheng 1478c5c9cd4dSSage Weil src_file = fget(srcfd); 1479ab67b7c1SYan Zheng if (!src_file) { 1480ab67b7c1SYan Zheng ret = -EBADF; 1481ab67b7c1SYan Zheng goto out_drop_write; 1482ab67b7c1SYan Zheng } 1483f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1484f46b5a66SChristoph Hellwig 1485c5c9cd4dSSage Weil ret = -EINVAL; 1486c5c9cd4dSSage Weil if (src == inode) 1487c5c9cd4dSSage Weil goto out_fput; 1488c5c9cd4dSSage Weil 1489ae01a0abSYan Zheng ret = -EISDIR; 1490ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1491f46b5a66SChristoph Hellwig goto out_fput; 1492f46b5a66SChristoph Hellwig 1493ae01a0abSYan Zheng ret = -EXDEV; 1494ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1495ae01a0abSYan Zheng goto out_fput; 1496ae01a0abSYan Zheng 1497ae01a0abSYan Zheng ret = -ENOMEM; 1498ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1499ae01a0abSYan Zheng if (!buf) 1500ae01a0abSYan Zheng goto out_fput; 1501ae01a0abSYan Zheng 1502ae01a0abSYan Zheng path = btrfs_alloc_path(); 1503ae01a0abSYan Zheng if (!path) { 1504ae01a0abSYan Zheng vfree(buf); 1505ae01a0abSYan Zheng goto out_fput; 1506ae01a0abSYan Zheng } 1507ae01a0abSYan Zheng path->reada = 2; 1508ae01a0abSYan Zheng 1509f46b5a66SChristoph Hellwig if (inode < src) { 1510f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1511f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1512f46b5a66SChristoph Hellwig } else { 1513f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1514f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1515f46b5a66SChristoph Hellwig } 1516f46b5a66SChristoph Hellwig 1517c5c9cd4dSSage Weil /* determine range to clone */ 1518c5c9cd4dSSage Weil ret = -EINVAL; 1519c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 1520f46b5a66SChristoph Hellwig goto out_unlock; 1521c5c9cd4dSSage Weil if (len == 0) 1522c5c9cd4dSSage Weil olen = len = src->i_size - off; 1523c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1524c5c9cd4dSSage Weil if (off + len == src->i_size) 1525c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1526c5c9cd4dSSage Weil - off; 1527c5c9cd4dSSage Weil 1528c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1529c5c9cd4dSSage Weil if ((off & (bs-1)) || 1530c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1531c5c9cd4dSSage Weil goto out_unlock; 1532c5c9cd4dSSage Weil 1533f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1534f46b5a66SChristoph Hellwig another, and lock file content */ 1535f46b5a66SChristoph Hellwig while (1) { 153631840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1537c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1538c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1539ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1540f46b5a66SChristoph Hellwig break; 1541c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1542ae01a0abSYan Zheng if (ordered) 1543ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1544c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1545f46b5a66SChristoph Hellwig } 1546f46b5a66SChristoph Hellwig 1547ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 1548ae01a0abSYan Zheng BUG_ON(!trans); 1549ae01a0abSYan Zheng 1550c5c9cd4dSSage Weil /* punch hole in destination first */ 1551920bbbfbSYan, Zheng btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); 1552c5c9cd4dSSage Weil 1553c5c9cd4dSSage Weil /* clone data */ 1554f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1555ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1556ae01a0abSYan Zheng key.offset = 0; 1557f46b5a66SChristoph Hellwig 1558f46b5a66SChristoph Hellwig while (1) { 1559f46b5a66SChristoph Hellwig /* 1560f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1561f46b5a66SChristoph Hellwig * tree. 1562f46b5a66SChristoph Hellwig */ 1563f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 1564f46b5a66SChristoph Hellwig if (ret < 0) 1565f46b5a66SChristoph Hellwig goto out; 1566f46b5a66SChristoph Hellwig 1567ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1568ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1569f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1570f46b5a66SChristoph Hellwig if (ret < 0) 1571f46b5a66SChristoph Hellwig goto out; 1572f46b5a66SChristoph Hellwig if (ret > 0) 1573f46b5a66SChristoph Hellwig break; 1574ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1575f46b5a66SChristoph Hellwig } 1576f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1577f46b5a66SChristoph Hellwig slot = path->slots[0]; 1578f46b5a66SChristoph Hellwig 1579ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1580d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1581f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1582f46b5a66SChristoph Hellwig break; 1583f46b5a66SChristoph Hellwig 1584c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1585c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1586c5c9cd4dSSage Weil int type; 158731840ae1SZheng Yan u32 size; 158831840ae1SZheng Yan struct btrfs_key new_key; 1589c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1590c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1591c5c9cd4dSSage Weil u8 comp; 159231840ae1SZheng Yan 159331840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 159431840ae1SZheng Yan read_extent_buffer(leaf, buf, 159531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 159631840ae1SZheng Yan size); 1597c5c9cd4dSSage Weil 1598c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1599c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1600c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1601c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1602c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1603c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1604d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1605d397712bSChris Mason extent); 1606d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1607d397712bSChris Mason extent); 1608c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1609d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1610d397712bSChris Mason extent); 1611c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1612c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1613c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1614c5c9cd4dSSage Weil extent); 1615c5c9cd4dSSage Weil } 161631840ae1SZheng Yan btrfs_release_path(root, path); 161731840ae1SZheng Yan 1618c5c9cd4dSSage Weil if (key.offset + datal < off || 1619c5c9cd4dSSage Weil key.offset >= off+len) 1620c5c9cd4dSSage Weil goto next; 1621c5c9cd4dSSage Weil 162231840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 162331840ae1SZheng Yan new_key.objectid = inode->i_ino; 1624c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1625c5c9cd4dSSage Weil 1626c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1627c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 162831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 162931840ae1SZheng Yan &new_key, size); 163031840ae1SZheng Yan if (ret) 163131840ae1SZheng Yan goto out; 163231840ae1SZheng Yan 163331840ae1SZheng Yan leaf = path->nodes[0]; 163431840ae1SZheng Yan slot = path->slots[0]; 163531840ae1SZheng Yan write_extent_buffer(leaf, buf, 163631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 163731840ae1SZheng Yan size); 1638ae01a0abSYan Zheng 1639f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1640f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1641c5c9cd4dSSage Weil 1642c5c9cd4dSSage Weil if (off > key.offset) { 1643c5c9cd4dSSage Weil datao += off - key.offset; 1644c5c9cd4dSSage Weil datal -= off - key.offset; 1645c5c9cd4dSSage Weil } 1646ac6889cbSChris Mason 1647ac6889cbSChris Mason if (key.offset + datal > off + len) 1648ac6889cbSChris Mason datal = off + len - key.offset; 1649ac6889cbSChris Mason 1650c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1651c5c9cd4dSSage Weil if (!disko) 1652c5c9cd4dSSage Weil datao = 0; 1653c5c9cd4dSSage Weil 1654c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1655c5c9cd4dSSage Weil datao); 1656c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1657c5c9cd4dSSage Weil datal); 1658c5c9cd4dSSage Weil if (disko) { 1659c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1660ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 16615d4f98a2SYan Zheng disko, diskl, 0, 1662f46b5a66SChristoph Hellwig root->root_key.objectid, 16635d4f98a2SYan Zheng inode->i_ino, 16645d4f98a2SYan Zheng new_key.offset - datao); 1665ae01a0abSYan Zheng BUG_ON(ret); 1666f46b5a66SChristoph Hellwig } 1667c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1668c5c9cd4dSSage Weil u64 skip = 0; 1669c5c9cd4dSSage Weil u64 trim = 0; 1670c5c9cd4dSSage Weil if (off > key.offset) { 1671c5c9cd4dSSage Weil skip = off - key.offset; 1672c5c9cd4dSSage Weil new_key.offset += skip; 167331840ae1SZheng Yan } 1674d397712bSChris Mason 1675c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1676c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1677d397712bSChris Mason 1678c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1679c5c9cd4dSSage Weil ret = -EINVAL; 1680c5c9cd4dSSage Weil goto out; 168131840ae1SZheng Yan } 1682c5c9cd4dSSage Weil size -= skip + trim; 1683c5c9cd4dSSage Weil datal -= skip + trim; 1684c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1685c5c9cd4dSSage Weil &new_key, size); 1686c5c9cd4dSSage Weil if (ret) 1687c5c9cd4dSSage Weil goto out; 1688c5c9cd4dSSage Weil 1689c5c9cd4dSSage Weil if (skip) { 1690d397712bSChris Mason u32 start = 1691d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1692c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1693c5c9cd4dSSage Weil datal); 1694c5c9cd4dSSage Weil } 1695c5c9cd4dSSage Weil 1696c5c9cd4dSSage Weil leaf = path->nodes[0]; 1697c5c9cd4dSSage Weil slot = path->slots[0]; 1698c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1699c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1700c5c9cd4dSSage Weil size); 1701c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1702c5c9cd4dSSage Weil } 1703c5c9cd4dSSage Weil 1704c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1705c5c9cd4dSSage Weil } 1706c5c9cd4dSSage Weil 1707c5c9cd4dSSage Weil next: 170831840ae1SZheng Yan btrfs_release_path(root, path); 1709ae01a0abSYan Zheng key.offset++; 1710ae01a0abSYan Zheng } 1711f46b5a66SChristoph Hellwig ret = 0; 1712f46b5a66SChristoph Hellwig out: 1713ae01a0abSYan Zheng btrfs_release_path(root, path); 1714ae01a0abSYan Zheng if (ret == 0) { 1715ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1716c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1717c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1718ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1719ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1720ae01a0abSYan Zheng } 1721f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1722c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1723ae01a0abSYan Zheng if (ret) 1724ae01a0abSYan Zheng vmtruncate(inode, 0); 1725f46b5a66SChristoph Hellwig out_unlock: 1726f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1727f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1728ae01a0abSYan Zheng vfree(buf); 1729ae01a0abSYan Zheng btrfs_free_path(path); 1730f46b5a66SChristoph Hellwig out_fput: 1731f46b5a66SChristoph Hellwig fput(src_file); 1732ab67b7c1SYan Zheng out_drop_write: 1733ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1734f46b5a66SChristoph Hellwig return ret; 1735f46b5a66SChristoph Hellwig } 1736f46b5a66SChristoph Hellwig 17377a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1738c5c9cd4dSSage Weil { 1739c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1740c5c9cd4dSSage Weil 17417a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1742c5c9cd4dSSage Weil return -EFAULT; 1743c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1744c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1745c5c9cd4dSSage Weil } 1746c5c9cd4dSSage Weil 1747f46b5a66SChristoph Hellwig /* 1748f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1749f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1750f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1751f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1752f46b5a66SChristoph Hellwig */ 1753b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1754f46b5a66SChristoph Hellwig { 1755f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1756f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1757f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 17581ab86aedSSage Weil int ret; 1759f46b5a66SChristoph Hellwig 17601ab86aedSSage Weil ret = -EPERM; 1761df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1762f46b5a66SChristoph Hellwig goto out; 17631ab86aedSSage Weil 17641ab86aedSSage Weil ret = -EINPROGRESS; 17651ab86aedSSage Weil if (file->private_data) 17661ab86aedSSage Weil goto out; 17679ca9ee09SSage Weil 1768c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1769c146afadSYan Zheng if (ret) 1770c146afadSYan Zheng goto out; 1771c146afadSYan Zheng 17729ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 17739ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 17749ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17759ca9ee09SSage Weil 1776f46b5a66SChristoph Hellwig ret = -ENOMEM; 17771ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 17781ab86aedSSage Weil if (!trans) 17791ab86aedSSage Weil goto out_drop; 17801ab86aedSSage Weil 17811ab86aedSSage Weil file->private_data = trans; 17821ab86aedSSage Weil return 0; 17831ab86aedSSage Weil 17841ab86aedSSage Weil out_drop: 17851ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 17861ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 17871ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17881ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1789f46b5a66SChristoph Hellwig out: 1790f46b5a66SChristoph Hellwig return ret; 1791f46b5a66SChristoph Hellwig } 1792f46b5a66SChristoph Hellwig 17936ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 17946ef5ed0dSJosef Bacik { 17956ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 17966ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 17976ef5ed0dSJosef Bacik struct btrfs_root *new_root; 17986ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 17996ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 18006ef5ed0dSJosef Bacik struct btrfs_path *path; 18016ef5ed0dSJosef Bacik struct btrfs_key location; 18026ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 18036ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 18046ef5ed0dSJosef Bacik u64 features; 18056ef5ed0dSJosef Bacik u64 objectid = 0; 18066ef5ed0dSJosef Bacik u64 dir_id; 18076ef5ed0dSJosef Bacik 18086ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 18096ef5ed0dSJosef Bacik return -EPERM; 18106ef5ed0dSJosef Bacik 18116ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 18126ef5ed0dSJosef Bacik return -EFAULT; 18136ef5ed0dSJosef Bacik 18146ef5ed0dSJosef Bacik if (!objectid) 18156ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 18166ef5ed0dSJosef Bacik 18176ef5ed0dSJosef Bacik location.objectid = objectid; 18186ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 18196ef5ed0dSJosef Bacik location.offset = (u64)-1; 18206ef5ed0dSJosef Bacik 18216ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 18226ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 18236ef5ed0dSJosef Bacik return PTR_ERR(new_root); 18246ef5ed0dSJosef Bacik 18256ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 18266ef5ed0dSJosef Bacik return -ENOENT; 18276ef5ed0dSJosef Bacik 18286ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 18296ef5ed0dSJosef Bacik if (!path) 18306ef5ed0dSJosef Bacik return -ENOMEM; 18316ef5ed0dSJosef Bacik path->leave_spinning = 1; 18326ef5ed0dSJosef Bacik 18336ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 18346ef5ed0dSJosef Bacik if (!trans) { 18356ef5ed0dSJosef Bacik btrfs_free_path(path); 18366ef5ed0dSJosef Bacik return -ENOMEM; 18376ef5ed0dSJosef Bacik } 18386ef5ed0dSJosef Bacik 18396ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 18406ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 18416ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 18426ef5ed0dSJosef Bacik if (!di) { 18436ef5ed0dSJosef Bacik btrfs_free_path(path); 18446ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18456ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 18466ef5ed0dSJosef Bacik "this isn't going to work\n"); 18476ef5ed0dSJosef Bacik return -ENOENT; 18486ef5ed0dSJosef Bacik } 18496ef5ed0dSJosef Bacik 18506ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 18516ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 18526ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 18536ef5ed0dSJosef Bacik btrfs_free_path(path); 18546ef5ed0dSJosef Bacik 18556ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 18566ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 18576ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 18586ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 18596ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 18606ef5ed0dSJosef Bacik } 18616ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18626ef5ed0dSJosef Bacik 18636ef5ed0dSJosef Bacik return 0; 18646ef5ed0dSJosef Bacik } 18656ef5ed0dSJosef Bacik 18661406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 18671406e432SJosef Bacik { 18681406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 18691406e432SJosef Bacik struct btrfs_ioctl_space_info space; 18701406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 18717fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 18727fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 18731406e432SJosef Bacik struct btrfs_space_info *info; 18747fde62bfSChris Mason int alloc_size; 18751406e432SJosef Bacik int ret = 0; 18767fde62bfSChris Mason int slot_count = 0; 18771406e432SJosef Bacik 18781406e432SJosef Bacik if (copy_from_user(&space_args, 18791406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 18801406e432SJosef Bacik sizeof(space_args))) 18811406e432SJosef Bacik return -EFAULT; 18821406e432SJosef Bacik 18837fde62bfSChris Mason /* first we count slots */ 18847fde62bfSChris Mason rcu_read_lock(); 18857fde62bfSChris Mason list_for_each_entry_rcu(info, &root->fs_info->space_info, list) 18867fde62bfSChris Mason slot_count++; 18877fde62bfSChris Mason rcu_read_unlock(); 18881406e432SJosef Bacik 18897fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 18907fde62bfSChris Mason if (space_args.space_slots == 0) { 18917fde62bfSChris Mason space_args.total_spaces = slot_count; 18927fde62bfSChris Mason goto out; 18937fde62bfSChris Mason } 18947fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 18957fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 18967fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 18977fde62bfSChris Mason */ 18987fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 18997fde62bfSChris Mason return -ENOMEM; 19007fde62bfSChris Mason 19017fde62bfSChris Mason space_args.total_spaces = 0; 19027fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 19037fde62bfSChris Mason if (!dest) 19047fde62bfSChris Mason return -ENOMEM; 19057fde62bfSChris Mason dest_orig = dest; 19067fde62bfSChris Mason 19077fde62bfSChris Mason /* now we have a buffer to copy into */ 19081406e432SJosef Bacik rcu_read_lock(); 19091406e432SJosef Bacik list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { 19107fde62bfSChris Mason /* make sure we don't copy more than we allocated 19117fde62bfSChris Mason * in our buffer 19127fde62bfSChris Mason */ 19137fde62bfSChris Mason if (slot_count == 0) 19147fde62bfSChris Mason break; 19157fde62bfSChris Mason slot_count--; 19167fde62bfSChris Mason 19177fde62bfSChris Mason /* make sure userland has enough room in their buffer */ 19181406e432SJosef Bacik if (space_args.total_spaces >= space_args.space_slots) 19191406e432SJosef Bacik break; 19207fde62bfSChris Mason 19211406e432SJosef Bacik space.flags = info->flags; 19221406e432SJosef Bacik space.total_bytes = info->total_bytes; 19231406e432SJosef Bacik space.used_bytes = info->bytes_used; 19247fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 19251406e432SJosef Bacik dest++; 19261406e432SJosef Bacik space_args.total_spaces++; 19271406e432SJosef Bacik } 19281406e432SJosef Bacik rcu_read_unlock(); 19291406e432SJosef Bacik 19307fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 19317fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 19327fde62bfSChris Mason 19337fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 19347fde62bfSChris Mason ret = -EFAULT; 19357fde62bfSChris Mason 19367fde62bfSChris Mason kfree(dest_orig); 19377fde62bfSChris Mason out: 19387fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 19391406e432SJosef Bacik ret = -EFAULT; 19401406e432SJosef Bacik 19411406e432SJosef Bacik return ret; 19421406e432SJosef Bacik } 19431406e432SJosef Bacik 1944f46b5a66SChristoph Hellwig /* 1945f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1946f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1947f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1948f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1949f46b5a66SChristoph Hellwig */ 1950f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1951f46b5a66SChristoph Hellwig { 1952f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1953f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1954f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1955f46b5a66SChristoph Hellwig 1956f46b5a66SChristoph Hellwig trans = file->private_data; 19571ab86aedSSage Weil if (!trans) 19581ab86aedSSage Weil return -EINVAL; 1959b214107eSChristoph Hellwig file->private_data = NULL; 19609ca9ee09SSage Weil 19611ab86aedSSage Weil btrfs_end_transaction(trans, root); 19621ab86aedSSage Weil 19639ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19649ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 19659ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19669ca9ee09SSage Weil 1967cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 19681ab86aedSSage Weil return 0; 1969f46b5a66SChristoph Hellwig } 1970f46b5a66SChristoph Hellwig 1971f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1972f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1973f46b5a66SChristoph Hellwig { 1974f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 19754bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1976f46b5a66SChristoph Hellwig 1977f46b5a66SChristoph Hellwig switch (cmd) { 19786cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 19796cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 19806cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 19816cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 19826cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 19836cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1984f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 19854bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 19863de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 19874bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 198876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 198976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 19906ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 19916ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 1992f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 19931e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 19941e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 19951e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 1996f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 19974bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1998f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 19994bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2000f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 20014bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2002f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2003f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2004f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2005c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2006c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 20077a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2008f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2009f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2010f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2011f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2012ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2013ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2014ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2015ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 20161406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 20171406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2018f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2019f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2020f46b5a66SChristoph Hellwig return 0; 2021f46b5a66SChristoph Hellwig } 2022f46b5a66SChristoph Hellwig 2023f46b5a66SChristoph Hellwig return -ENOTTY; 2024f46b5a66SChristoph Hellwig } 2025