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" 5198d377a0STARUISI Hiroaki #include "ctree.h" 52f46b5a66SChristoph Hellwig 536cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 546cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 556cbff00fSChristoph Hellwig { 566cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 576cbff00fSChristoph Hellwig return flags; 586cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 596cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 606cbff00fSChristoph Hellwig else 616cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 626cbff00fSChristoph Hellwig } 63f46b5a66SChristoph Hellwig 646cbff00fSChristoph Hellwig /* 656cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 666cbff00fSChristoph Hellwig */ 676cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 686cbff00fSChristoph Hellwig { 696cbff00fSChristoph Hellwig unsigned int iflags = 0; 706cbff00fSChristoph Hellwig 716cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 726cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 736cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 746cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 756cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 766cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 786cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 806cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 826cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 836cbff00fSChristoph Hellwig 846cbff00fSChristoph Hellwig return iflags; 856cbff00fSChristoph Hellwig } 866cbff00fSChristoph Hellwig 876cbff00fSChristoph Hellwig /* 886cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 896cbff00fSChristoph Hellwig */ 906cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 916cbff00fSChristoph Hellwig { 926cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 936cbff00fSChristoph Hellwig 946cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 956cbff00fSChristoph Hellwig 966cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 976cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 986cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 996cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1006cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1016cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1026cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1036cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1046cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1056cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1066cbff00fSChristoph Hellwig } 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig /* 1096cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1106cbff00fSChristoph Hellwig * 1116cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1126cbff00fSChristoph Hellwig */ 1136cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1146cbff00fSChristoph Hellwig { 1150b4dcea5SChris Mason unsigned int flags; 1160b4dcea5SChris Mason 1170b4dcea5SChris Mason if (!dir) 1180b4dcea5SChris Mason return; 1190b4dcea5SChris Mason 1200b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1236cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1246cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1256cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1266cbff00fSChristoph Hellwig 1276cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1286cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1296cbff00fSChristoph Hellwig } 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1326cbff00fSChristoph Hellwig { 1336cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1346cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1376cbff00fSChristoph Hellwig return -EFAULT; 1386cbff00fSChristoph Hellwig return 0; 1396cbff00fSChristoph Hellwig } 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1426cbff00fSChristoph Hellwig { 1436cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1446cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1456cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1466cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1476cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1486cbff00fSChristoph Hellwig int ret; 1496cbff00fSChristoph Hellwig 1506cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1516cbff00fSChristoph Hellwig return -EFAULT; 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1546cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1556cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1566cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1596cbff00fSChristoph Hellwig return -EACCES; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1646cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1656cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1666cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1676cbff00fSChristoph Hellwig ret = -EPERM; 1686cbff00fSChristoph Hellwig goto out_unlock; 1696cbff00fSChristoph Hellwig } 1706cbff00fSChristoph Hellwig } 1716cbff00fSChristoph Hellwig 1726cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1736cbff00fSChristoph Hellwig if (ret) 1746cbff00fSChristoph Hellwig goto out_unlock; 1756cbff00fSChristoph Hellwig 1766cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1776cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1786cbff00fSChristoph Hellwig else 1796cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1806cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1816cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1826cbff00fSChristoph Hellwig else 1836cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1846cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1856cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1866cbff00fSChristoph Hellwig else 1876cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1886cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1896cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1906cbff00fSChristoph Hellwig else 1916cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1926cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1936cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1946cbff00fSChristoph Hellwig else 1956cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1966cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1976cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1986cbff00fSChristoph Hellwig else 1996cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2006cbff00fSChristoph Hellwig 2016cbff00fSChristoph Hellwig 2026cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2036cbff00fSChristoph Hellwig BUG_ON(!trans); 2046cbff00fSChristoph Hellwig 2056cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2066cbff00fSChristoph Hellwig BUG_ON(ret); 2076cbff00fSChristoph Hellwig 2086cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2096cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2106cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2116cbff00fSChristoph Hellwig 2126cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2136cbff00fSChristoph Hellwig out_unlock: 2146cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2156cbff00fSChristoph Hellwig return 0; 2166cbff00fSChristoph Hellwig } 2176cbff00fSChristoph Hellwig 2186cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2196cbff00fSChristoph Hellwig { 2206cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2236cbff00fSChristoph Hellwig } 224f46b5a66SChristoph Hellwig 225cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 226cb8e7090SChristoph Hellwig struct dentry *dentry, 227cb8e7090SChristoph Hellwig char *name, int namelen) 228f46b5a66SChristoph Hellwig { 229f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 230f46b5a66SChristoph Hellwig struct btrfs_key key; 231f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 232f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 233f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23476dda93cSYan, Zheng struct btrfs_root *new_root; 23576dda93cSYan, Zheng struct inode *dir = dentry->d_parent->d_inode; 236f46b5a66SChristoph Hellwig int ret; 237f46b5a66SChristoph Hellwig int err; 238f46b5a66SChristoph Hellwig u64 objectid; 239f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2403de4586cSChris Mason u64 index = 0; 241f46b5a66SChristoph Hellwig 2429ed74f2dSJosef Bacik /* 2439ed74f2dSJosef Bacik * 1 - inode item 2449ed74f2dSJosef Bacik * 2 - refs 2459ed74f2dSJosef Bacik * 1 - root item 2469ed74f2dSJosef Bacik * 2 - dir items 2479ed74f2dSJosef Bacik */ 2489ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 249f46b5a66SChristoph Hellwig if (ret) 25076dda93cSYan, Zheng return ret; 251f46b5a66SChristoph Hellwig 252f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 253f46b5a66SChristoph Hellwig BUG_ON(!trans); 254f46b5a66SChristoph Hellwig 255f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 256f46b5a66SChristoph Hellwig 0, &objectid); 257f46b5a66SChristoph Hellwig if (ret) 258f46b5a66SChristoph Hellwig goto fail; 259f46b5a66SChristoph Hellwig 2605d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2615d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2628e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2638e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2648e8a1e31SJosef Bacik goto fail; 2658e8a1e31SJosef Bacik } 266f46b5a66SChristoph Hellwig 2675d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 268f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 269f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2705d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 271f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 272f46b5a66SChristoph Hellwig 273f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 274f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 275f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2765d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2775d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2785d4f98a2SYan Zheng BTRFS_UUID_SIZE); 279f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 280f46b5a66SChristoph Hellwig 281f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 282f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 283f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 284f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 285f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 286a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 287f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 288f46b5a66SChristoph Hellwig 289f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 29084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 291f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 292f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 295f46b5a66SChristoph Hellwig 296f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 297f46b5a66SChristoph Hellwig root_item.drop_level = 0; 298f46b5a66SChristoph Hellwig 299925baeddSChris Mason btrfs_tree_unlock(leaf); 300f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 301f46b5a66SChristoph Hellwig leaf = NULL; 302f46b5a66SChristoph Hellwig 303f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 304f46b5a66SChristoph Hellwig 305f46b5a66SChristoph Hellwig key.objectid = objectid; 3065d4f98a2SYan Zheng key.offset = 0; 307f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 308f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 309f46b5a66SChristoph Hellwig &root_item); 310f46b5a66SChristoph Hellwig if (ret) 311f46b5a66SChristoph Hellwig goto fail; 312f46b5a66SChristoph Hellwig 31376dda93cSYan, Zheng key.offset = (u64)-1; 31476dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31576dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31676dda93cSYan, Zheng 31776dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31876dda93cSYan, Zheng 31976dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 32076dda93cSYan, Zheng BTRFS_I(dir)->block_group); 321f46b5a66SChristoph Hellwig /* 322f46b5a66SChristoph Hellwig * insert the directory item 323f46b5a66SChristoph Hellwig */ 3243de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3253de4586cSChris Mason BUG_ON(ret); 3263de4586cSChris Mason 3273de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 328f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3293de4586cSChris Mason BTRFS_FT_DIR, index); 330f46b5a66SChristoph Hellwig if (ret) 331f46b5a66SChristoph Hellwig goto fail; 3320660b5afSChris Mason 33352c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33552c26179SYan Zheng BUG_ON(ret); 33652c26179SYan Zheng 3370660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3384df27c4dSYan, Zheng objectid, root->root_key.objectid, 3390660b5afSChris Mason dir->i_ino, index, name, namelen); 34076dda93cSYan, Zheng 3410660b5afSChris Mason BUG_ON(ret); 3420660b5afSChris Mason 34376dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 344f46b5a66SChristoph Hellwig fail: 34576dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 346f46b5a66SChristoph Hellwig if (err && !ret) 347f46b5a66SChristoph Hellwig ret = err; 3489ed74f2dSJosef Bacik 3499ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 350f46b5a66SChristoph Hellwig return ret; 351f46b5a66SChristoph Hellwig } 352f46b5a66SChristoph Hellwig 3533de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3543de4586cSChris Mason char *name, int namelen) 355f46b5a66SChristoph Hellwig { 3562e4bfab9SYan, Zheng struct inode *inode; 357f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 358f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3592e4bfab9SYan, Zheng int ret; 360f46b5a66SChristoph Hellwig 361f46b5a66SChristoph Hellwig if (!root->ref_cows) 362f46b5a66SChristoph Hellwig return -EINVAL; 363f46b5a66SChristoph Hellwig 3649ed74f2dSJosef Bacik /* 3659ed74f2dSJosef Bacik * 1 - inode item 3669ed74f2dSJosef Bacik * 2 - refs 3679ed74f2dSJosef Bacik * 1 - root item 3689ed74f2dSJosef Bacik * 2 - dir items 3699ed74f2dSJosef Bacik */ 3709ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 371f46b5a66SChristoph Hellwig if (ret) 3722e4bfab9SYan, Zheng goto fail; 373f46b5a66SChristoph Hellwig 3743de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 375f46b5a66SChristoph Hellwig if (!pending_snapshot) { 376f46b5a66SChristoph Hellwig ret = -ENOMEM; 3779ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3782e4bfab9SYan, Zheng goto fail; 379f46b5a66SChristoph Hellwig } 380f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 381f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 382f46b5a66SChristoph Hellwig ret = -ENOMEM; 383f46b5a66SChristoph Hellwig kfree(pending_snapshot); 3849ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3852e4bfab9SYan, Zheng goto fail; 386f46b5a66SChristoph Hellwig } 387f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 388f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3893de4586cSChris Mason pending_snapshot->dentry = dentry; 390f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 391f46b5a66SChristoph Hellwig BUG_ON(!trans); 392f46b5a66SChristoph Hellwig pending_snapshot->root = root; 393f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 394f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 3952e4bfab9SYan, Zheng ret = btrfs_commit_transaction(trans, root); 3962e4bfab9SYan, Zheng BUG_ON(ret); 3972e4bfab9SYan, Zheng btrfs_unreserve_metadata_space(root, 6); 398f46b5a66SChristoph Hellwig 3992e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 4002e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4012e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4022e4bfab9SYan, Zheng goto fail; 4032e4bfab9SYan, Zheng } 4042e4bfab9SYan, Zheng BUG_ON(!inode); 4052e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4062e4bfab9SYan, Zheng ret = 0; 4072e4bfab9SYan, Zheng fail: 408f46b5a66SChristoph Hellwig return ret; 409f46b5a66SChristoph Hellwig } 410f46b5a66SChristoph Hellwig 411cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 412cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 413cb8e7090SChristoph Hellwig { 414cb8e7090SChristoph Hellwig if (child->d_inode) 415cb8e7090SChristoph Hellwig return -EEXIST; 416cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 417cb8e7090SChristoph Hellwig return -ENOENT; 418cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 419cb8e7090SChristoph Hellwig } 420cb8e7090SChristoph Hellwig 421cb8e7090SChristoph Hellwig /* 422cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 423cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 424cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 425cb8e7090SChristoph Hellwig */ 42676dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 42776dda93cSYan, Zheng char *name, int namelen, 4283de4586cSChris Mason struct btrfs_root *snap_src) 429cb8e7090SChristoph Hellwig { 43076dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 431cb8e7090SChristoph Hellwig struct dentry *dentry; 432cb8e7090SChristoph Hellwig int error; 433cb8e7090SChristoph Hellwig 43476dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 435cb8e7090SChristoph Hellwig 436cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 437cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 438cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 439cb8e7090SChristoph Hellwig goto out_unlock; 440cb8e7090SChristoph Hellwig 441cb8e7090SChristoph Hellwig error = -EEXIST; 442cb8e7090SChristoph Hellwig if (dentry->d_inode) 443cb8e7090SChristoph Hellwig goto out_dput; 444cb8e7090SChristoph Hellwig 445cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 446cb8e7090SChristoph Hellwig if (error) 447cb8e7090SChristoph Hellwig goto out_dput; 448cb8e7090SChristoph Hellwig 44976dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 450cb8e7090SChristoph Hellwig if (error) 451cb8e7090SChristoph Hellwig goto out_drop_write; 452cb8e7090SChristoph Hellwig 45376dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 45476dda93cSYan, Zheng 45576dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 45676dda93cSYan, Zheng goto out_up_read; 45776dda93cSYan, Zheng 4583de4586cSChris Mason if (snap_src) { 45976dda93cSYan, Zheng error = create_snapshot(snap_src, dentry, 46076dda93cSYan, Zheng name, namelen); 4613de4586cSChris Mason } else { 46276dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 46376dda93cSYan, Zheng name, namelen); 4643de4586cSChris Mason } 46576dda93cSYan, Zheng if (!error) 46676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 46776dda93cSYan, Zheng out_up_read: 46876dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 469cb8e7090SChristoph Hellwig out_drop_write: 470cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 471cb8e7090SChristoph Hellwig out_dput: 472cb8e7090SChristoph Hellwig dput(dentry); 473cb8e7090SChristoph Hellwig out_unlock: 47476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 475cb8e7090SChristoph Hellwig return error; 476cb8e7090SChristoph Hellwig } 477cb8e7090SChristoph Hellwig 478940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 4791e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 4801e701a32SChris Mason u64 *defrag_end) 481940100a4SChris Mason { 482940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 483940100a4SChris Mason struct extent_map *em = NULL; 484940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 485940100a4SChris Mason int ret = 1; 486940100a4SChris Mason 4871e701a32SChris Mason 4881e701a32SChris Mason if (thresh == 0) 4891e701a32SChris Mason thresh = 256 * 1024; 4901e701a32SChris Mason 491940100a4SChris Mason /* 492940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 493940100a4SChris Mason * defragging it 494940100a4SChris Mason */ 495940100a4SChris Mason if (start < *defrag_end) 496940100a4SChris Mason return 1; 497940100a4SChris Mason 498940100a4SChris Mason *skip = 0; 499940100a4SChris Mason 500940100a4SChris Mason /* 501940100a4SChris Mason * hopefully we have this extent in the tree already, try without 502940100a4SChris Mason * the full extent lock 503940100a4SChris Mason */ 504940100a4SChris Mason read_lock(&em_tree->lock); 505940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 506940100a4SChris Mason read_unlock(&em_tree->lock); 507940100a4SChris Mason 508940100a4SChris Mason if (!em) { 509940100a4SChris Mason /* get the big lock and read metadata off disk */ 510940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 511940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 512940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 513940100a4SChris Mason 514940100a4SChris Mason if (!em) 515940100a4SChris Mason return 0; 516940100a4SChris Mason } 517940100a4SChris Mason 518940100a4SChris Mason /* this will cover holes, and inline extents */ 519940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 520940100a4SChris Mason ret = 0; 521940100a4SChris Mason 522940100a4SChris Mason /* 523940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 524940100a4SChris Mason */ 5251e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 526940100a4SChris Mason ret = 0; 527940100a4SChris Mason 528940100a4SChris Mason /* 529940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 530940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 531940100a4SChris Mason * so that the next tiny extent will force a defrag. 532940100a4SChris Mason * 533940100a4SChris Mason * The end result of this is that tiny extents before a single big 534940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 535940100a4SChris Mason */ 536940100a4SChris Mason if (ret) { 537940100a4SChris Mason *last_len += len; 538940100a4SChris Mason *defrag_end = extent_map_end(em); 539940100a4SChris Mason } else { 540940100a4SChris Mason *last_len = 0; 541940100a4SChris Mason *skip = extent_map_end(em); 542940100a4SChris Mason *defrag_end = 0; 543940100a4SChris Mason } 544940100a4SChris Mason 545940100a4SChris Mason free_extent_map(em); 546940100a4SChris Mason return ret; 547940100a4SChris Mason } 548940100a4SChris Mason 5491e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 5501e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 551f46b5a66SChristoph Hellwig { 552f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 553f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 554f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5553eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 556f46b5a66SChristoph Hellwig struct page *page; 557f46b5a66SChristoph Hellwig unsigned long last_index; 558f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 559f46b5a66SChristoph Hellwig unsigned long total_read = 0; 560f46b5a66SChristoph Hellwig u64 page_start; 561f46b5a66SChristoph Hellwig u64 page_end; 562940100a4SChris Mason u64 last_len = 0; 563940100a4SChris Mason u64 skip = 0; 564940100a4SChris Mason u64 defrag_end = 0; 565f46b5a66SChristoph Hellwig unsigned long i; 566f46b5a66SChristoph Hellwig int ret; 567f46b5a66SChristoph Hellwig 568940100a4SChris Mason if (inode->i_size == 0) 569940100a4SChris Mason return 0; 570f46b5a66SChristoph Hellwig 5711e701a32SChris Mason if (range->start + range->len > range->start) { 5721e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 5731e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 5741e701a32SChris Mason } else { 575940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 5761e701a32SChris Mason } 5771e701a32SChris Mason 5781e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 579940100a4SChris Mason while (i <= last_index) { 580940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 5811e701a32SChris Mason PAGE_CACHE_SIZE, 5821e701a32SChris Mason range->extent_thresh, 5831e701a32SChris Mason &last_len, &skip, 584940100a4SChris Mason &defrag_end)) { 585940100a4SChris Mason unsigned long next; 586940100a4SChris Mason /* 587940100a4SChris Mason * the should_defrag function tells us how much to skip 588940100a4SChris Mason * bump our counter by the suggested amount 589940100a4SChris Mason */ 590940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 591940100a4SChris Mason i = max(i + 1, next); 592940100a4SChris Mason continue; 593940100a4SChris Mason } 594940100a4SChris Mason 595f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 596f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 597f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 598f46b5a66SChristoph Hellwig } 599f46b5a66SChristoph Hellwig total_read++; 600940100a4SChris Mason mutex_lock(&inode->i_mutex); 6011e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6021e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 603940100a4SChris Mason 604940100a4SChris Mason ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); 605940100a4SChris Mason if (ret) { 606940100a4SChris Mason ret = -ENOSPC; 607940100a4SChris Mason break; 608940100a4SChris Mason } 609940100a4SChris Mason 610940100a4SChris Mason ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); 611940100a4SChris Mason if (ret) { 612940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 613940100a4SChris Mason PAGE_CACHE_SIZE); 614940100a4SChris Mason ret = -ENOSPC; 615940100a4SChris Mason break; 616940100a4SChris Mason } 6173eaa2885SChris Mason again: 618940100a4SChris Mason if (inode->i_size == 0 || 619940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 620940100a4SChris Mason ret = 0; 621940100a4SChris Mason goto err_reservations; 622940100a4SChris Mason } 623940100a4SChris Mason 624f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 625f46b5a66SChristoph Hellwig if (!page) 626940100a4SChris Mason goto err_reservations; 627940100a4SChris Mason 628f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 629f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 630f46b5a66SChristoph Hellwig lock_page(page); 631f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 632f46b5a66SChristoph Hellwig unlock_page(page); 633f46b5a66SChristoph Hellwig page_cache_release(page); 634940100a4SChris Mason goto err_reservations; 635f46b5a66SChristoph Hellwig } 636f46b5a66SChristoph Hellwig } 637f46b5a66SChristoph Hellwig 638940100a4SChris Mason if (page->mapping != inode->i_mapping) { 639940100a4SChris Mason unlock_page(page); 640940100a4SChris Mason page_cache_release(page); 641940100a4SChris Mason goto again; 642940100a4SChris Mason } 643940100a4SChris Mason 644f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 645f46b5a66SChristoph Hellwig 646940100a4SChris Mason if (PageDirty(page)) { 647940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 648940100a4SChris Mason PAGE_CACHE_SIZE); 649940100a4SChris Mason goto loop_unlock; 650940100a4SChris Mason } 651940100a4SChris Mason 652f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 653f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 654f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 6553eaa2885SChris Mason 6563eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 6573eaa2885SChris Mason if (ordered) { 6583eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 6593eaa2885SChris Mason unlock_page(page); 6603eaa2885SChris Mason page_cache_release(page); 6613eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 6623eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 6633eaa2885SChris Mason goto again; 6643eaa2885SChris Mason } 6653eaa2885SChris Mason set_page_extent_mapped(page); 6663eaa2885SChris Mason 667f87f057bSChris Mason /* 668f87f057bSChris Mason * this makes sure page_mkwrite is called on the 669f87f057bSChris Mason * page if it is dirtied again later 670f87f057bSChris Mason */ 671f87f057bSChris Mason clear_page_dirty_for_io(page); 672940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 673940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 674940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 675f87f057bSChris Mason 6762ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 677940100a4SChris Mason ClearPageChecked(page); 678f46b5a66SChristoph Hellwig set_page_dirty(page); 679a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 680940100a4SChris Mason 681940100a4SChris Mason loop_unlock: 682f46b5a66SChristoph Hellwig unlock_page(page); 683f46b5a66SChristoph Hellwig page_cache_release(page); 684940100a4SChris Mason mutex_unlock(&inode->i_mutex); 685940100a4SChris Mason 686940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 687f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 688940100a4SChris Mason i++; 689f46b5a66SChristoph Hellwig } 690f46b5a66SChristoph Hellwig 6911e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 6921e701a32SChris Mason filemap_flush(inode->i_mapping); 6931e701a32SChris Mason 6941e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 6951e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 6961e701a32SChris Mason * we have to make sure the IO is actually started and that 6971e701a32SChris Mason * ordered extents get created before we return 6981e701a32SChris Mason */ 6991e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 7001e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7011e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7021e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7031e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7041e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7051e701a32SChris Mason } 7061e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7071e701a32SChris Mason 7081e701a32SChris Mason mutex_lock(&inode->i_mutex); 7091e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7101e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7111e701a32SChris Mason } 7121e701a32SChris Mason 713f46b5a66SChristoph Hellwig return 0; 714940100a4SChris Mason 715940100a4SChris Mason err_reservations: 716940100a4SChris Mason mutex_unlock(&inode->i_mutex); 717940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); 718940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 719940100a4SChris Mason return ret; 720f46b5a66SChristoph Hellwig } 721f46b5a66SChristoph Hellwig 72276dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 72376dda93cSYan, Zheng void __user *arg) 724f46b5a66SChristoph Hellwig { 725f46b5a66SChristoph Hellwig u64 new_size; 726f46b5a66SChristoph Hellwig u64 old_size; 727f46b5a66SChristoph Hellwig u64 devid = 1; 728f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 729f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 730f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 731f46b5a66SChristoph Hellwig char *sizestr; 732f46b5a66SChristoph Hellwig char *devstr = NULL; 733f46b5a66SChristoph Hellwig int ret = 0; 734f46b5a66SChristoph Hellwig int namelen; 735f46b5a66SChristoph Hellwig int mod = 0; 736f46b5a66SChristoph Hellwig 737c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 738c146afadSYan Zheng return -EROFS; 739c146afadSYan Zheng 740e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 741e441d54dSChris Mason return -EPERM; 742e441d54dSChris Mason 743dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 744dae7b665SLi Zefan if (IS_ERR(vol_args)) 745dae7b665SLi Zefan return PTR_ERR(vol_args); 7465516e595SMark Fasheh 7475516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 748f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 749f46b5a66SChristoph Hellwig 7507d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 751f46b5a66SChristoph Hellwig sizestr = vol_args->name; 752f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 753f46b5a66SChristoph Hellwig if (devstr) { 754f46b5a66SChristoph Hellwig char *end; 755f46b5a66SChristoph Hellwig sizestr = devstr + 1; 756f46b5a66SChristoph Hellwig *devstr = '\0'; 757f46b5a66SChristoph Hellwig devstr = vol_args->name; 758f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 75921380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 76021380931SJoel Becker (unsigned long long)devid); 761f46b5a66SChristoph Hellwig } 7622b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 763f46b5a66SChristoph Hellwig if (!device) { 76421380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 76521380931SJoel Becker (unsigned long long)devid); 766f46b5a66SChristoph Hellwig ret = -EINVAL; 767f46b5a66SChristoph Hellwig goto out_unlock; 768f46b5a66SChristoph Hellwig } 769f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 770f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 771f46b5a66SChristoph Hellwig else { 772f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 773f46b5a66SChristoph Hellwig mod = -1; 774f46b5a66SChristoph Hellwig sizestr++; 775f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 776f46b5a66SChristoph Hellwig mod = 1; 777f46b5a66SChristoph Hellwig sizestr++; 778f46b5a66SChristoph Hellwig } 77991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 780f46b5a66SChristoph Hellwig if (new_size == 0) { 781f46b5a66SChristoph Hellwig ret = -EINVAL; 782f46b5a66SChristoph Hellwig goto out_unlock; 783f46b5a66SChristoph Hellwig } 784f46b5a66SChristoph Hellwig } 785f46b5a66SChristoph Hellwig 786f46b5a66SChristoph Hellwig old_size = device->total_bytes; 787f46b5a66SChristoph Hellwig 788f46b5a66SChristoph Hellwig if (mod < 0) { 789f46b5a66SChristoph Hellwig if (new_size > old_size) { 790f46b5a66SChristoph Hellwig ret = -EINVAL; 791f46b5a66SChristoph Hellwig goto out_unlock; 792f46b5a66SChristoph Hellwig } 793f46b5a66SChristoph Hellwig new_size = old_size - new_size; 794f46b5a66SChristoph Hellwig } else if (mod > 0) { 795f46b5a66SChristoph Hellwig new_size = old_size + new_size; 796f46b5a66SChristoph Hellwig } 797f46b5a66SChristoph Hellwig 798f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 799f46b5a66SChristoph Hellwig ret = -EINVAL; 800f46b5a66SChristoph Hellwig goto out_unlock; 801f46b5a66SChristoph Hellwig } 802f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 803f46b5a66SChristoph Hellwig ret = -EFBIG; 804f46b5a66SChristoph Hellwig goto out_unlock; 805f46b5a66SChristoph Hellwig } 806f46b5a66SChristoph Hellwig 807f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 808f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 809f46b5a66SChristoph Hellwig 810f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 811f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 812f46b5a66SChristoph Hellwig 813f46b5a66SChristoph Hellwig if (new_size > old_size) { 814f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 815f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 816f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 817f46b5a66SChristoph Hellwig } else { 818f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 819f46b5a66SChristoph Hellwig } 820f46b5a66SChristoph Hellwig 821f46b5a66SChristoph Hellwig out_unlock: 8227d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 823f46b5a66SChristoph Hellwig kfree(vol_args); 824f46b5a66SChristoph Hellwig return ret; 825f46b5a66SChristoph Hellwig } 826f46b5a66SChristoph Hellwig 827cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 8283de4586cSChris Mason void __user *arg, int subvol) 829f46b5a66SChristoph Hellwig { 830cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 831f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 8323de4586cSChris Mason struct file *src_file; 833f46b5a66SChristoph Hellwig int namelen; 8343de4586cSChris Mason int ret = 0; 835f46b5a66SChristoph Hellwig 836c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 837c146afadSYan Zheng return -EROFS; 838c146afadSYan Zheng 839dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 840dae7b665SLi Zefan if (IS_ERR(vol_args)) 841dae7b665SLi Zefan return PTR_ERR(vol_args); 842f46b5a66SChristoph Hellwig 8435516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 844f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 845f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 846f46b5a66SChristoph Hellwig ret = -EINVAL; 847f46b5a66SChristoph Hellwig goto out; 848f46b5a66SChristoph Hellwig } 849f46b5a66SChristoph Hellwig 8503de4586cSChris Mason if (subvol) { 85176dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 85276dda93cSYan, Zheng NULL); 853cb8e7090SChristoph Hellwig } else { 8543de4586cSChris Mason struct inode *src_inode; 8553de4586cSChris Mason src_file = fget(vol_args->fd); 8563de4586cSChris Mason if (!src_file) { 8573de4586cSChris Mason ret = -EINVAL; 8583de4586cSChris Mason goto out; 8593de4586cSChris Mason } 8603de4586cSChris Mason 8613de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 8623de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 863d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 864d397712bSChris Mason "another FS\n"); 8653de4586cSChris Mason ret = -EINVAL; 8663de4586cSChris Mason fput(src_file); 8673de4586cSChris Mason goto out; 8683de4586cSChris Mason } 86976dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 87076dda93cSYan, Zheng BTRFS_I(src_inode)->root); 8713de4586cSChris Mason fput(src_file); 872cb8e7090SChristoph Hellwig } 873f46b5a66SChristoph Hellwig out: 874f46b5a66SChristoph Hellwig kfree(vol_args); 875f46b5a66SChristoph Hellwig return ret; 876f46b5a66SChristoph Hellwig } 877f46b5a66SChristoph Hellwig 87876dda93cSYan, Zheng /* 87976dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 88076dda93cSYan, Zheng */ 88176dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 88276dda93cSYan, Zheng { 88376dda93cSYan, Zheng struct btrfs_path *path; 88476dda93cSYan, Zheng struct btrfs_key key; 88576dda93cSYan, Zheng int ret; 88676dda93cSYan, Zheng 88776dda93cSYan, Zheng path = btrfs_alloc_path(); 88876dda93cSYan, Zheng if (!path) 88976dda93cSYan, Zheng return -ENOMEM; 89076dda93cSYan, Zheng 89176dda93cSYan, Zheng key.objectid = root->root_key.objectid; 89276dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 89376dda93cSYan, Zheng key.offset = (u64)-1; 89476dda93cSYan, Zheng 89576dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 89676dda93cSYan, Zheng &key, path, 0, 0); 89776dda93cSYan, Zheng if (ret < 0) 89876dda93cSYan, Zheng goto out; 89976dda93cSYan, Zheng BUG_ON(ret == 0); 90076dda93cSYan, Zheng 90176dda93cSYan, Zheng ret = 0; 90276dda93cSYan, Zheng if (path->slots[0] > 0) { 90376dda93cSYan, Zheng path->slots[0]--; 90476dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 90576dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 90676dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 90776dda93cSYan, Zheng ret = -ENOTEMPTY; 90876dda93cSYan, Zheng } 90976dda93cSYan, Zheng out: 91076dda93cSYan, Zheng btrfs_free_path(path); 91176dda93cSYan, Zheng return ret; 91276dda93cSYan, Zheng } 91376dda93cSYan, Zheng 914ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 915ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 916ac8e9819SChris Mason { 917ac8e9819SChris Mason if (key->objectid < sk->min_objectid) 918ac8e9819SChris Mason return 0; 919ac8e9819SChris Mason if (key->offset < sk->min_offset) 920ac8e9819SChris Mason return 0; 921ac8e9819SChris Mason if (key->type < sk->min_type) 922ac8e9819SChris Mason return 0; 923ac8e9819SChris Mason if (key->objectid > sk->max_objectid) 924ac8e9819SChris Mason return 0; 925ac8e9819SChris Mason if (key->type > sk->max_type) 926ac8e9819SChris Mason return 0; 927ac8e9819SChris Mason if (key->offset > sk->max_offset) 928ac8e9819SChris Mason return 0; 929ac8e9819SChris Mason return 1; 930ac8e9819SChris Mason } 931ac8e9819SChris Mason 932ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 933ac8e9819SChris Mason struct btrfs_path *path, 934ac8e9819SChris Mason struct btrfs_key *key, 935ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 936ac8e9819SChris Mason char *buf, 937ac8e9819SChris Mason unsigned long *sk_offset, 938ac8e9819SChris Mason int *num_found) 939ac8e9819SChris Mason { 940ac8e9819SChris Mason u64 found_transid; 941ac8e9819SChris Mason struct extent_buffer *leaf; 942ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 943ac8e9819SChris Mason unsigned long item_off; 944ac8e9819SChris Mason unsigned long item_len; 945ac8e9819SChris Mason int nritems; 946ac8e9819SChris Mason int i; 947ac8e9819SChris Mason int slot; 948ac8e9819SChris Mason int found = 0; 949ac8e9819SChris Mason int ret = 0; 950ac8e9819SChris Mason 951ac8e9819SChris Mason leaf = path->nodes[0]; 952ac8e9819SChris Mason slot = path->slots[0]; 953ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 954ac8e9819SChris Mason 955ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 956ac8e9819SChris Mason i = nritems; 957ac8e9819SChris Mason goto advance_key; 958ac8e9819SChris Mason } 959ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 960ac8e9819SChris Mason 961ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 962ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 963ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 964ac8e9819SChris Mason 965ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 966ac8e9819SChris Mason item_len = 0; 967ac8e9819SChris Mason 968ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 969ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 970ac8e9819SChris Mason ret = 1; 971ac8e9819SChris Mason goto overflow; 972ac8e9819SChris Mason } 973ac8e9819SChris Mason 974ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 975ac8e9819SChris Mason if (!key_in_sk(key, sk)) 976ac8e9819SChris Mason continue; 977ac8e9819SChris Mason 978ac8e9819SChris Mason sh.objectid = key->objectid; 979ac8e9819SChris Mason sh.offset = key->offset; 980ac8e9819SChris Mason sh.type = key->type; 981ac8e9819SChris Mason sh.len = item_len; 982ac8e9819SChris Mason sh.transid = found_transid; 983ac8e9819SChris Mason 984ac8e9819SChris Mason /* copy search result header */ 985ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 986ac8e9819SChris Mason *sk_offset += sizeof(sh); 987ac8e9819SChris Mason 988ac8e9819SChris Mason if (item_len) { 989ac8e9819SChris Mason char *p = buf + *sk_offset; 990ac8e9819SChris Mason /* copy the item */ 991ac8e9819SChris Mason read_extent_buffer(leaf, p, 992ac8e9819SChris Mason item_off, item_len); 993ac8e9819SChris Mason *sk_offset += item_len; 994ac8e9819SChris Mason found++; 995ac8e9819SChris Mason } 996ac8e9819SChris Mason 997ac8e9819SChris Mason if (*num_found >= sk->nr_items) 998ac8e9819SChris Mason break; 999ac8e9819SChris Mason } 1000ac8e9819SChris Mason advance_key: 1001ac8e9819SChris Mason if (key->offset < (u64)-1) 1002ac8e9819SChris Mason key->offset++; 1003854d2c35SSage Weil else if (key->type < (u8)-1) 1004ac8e9819SChris Mason key->type++; 1005ac8e9819SChris Mason else if (key->objectid < (u64)-1) 1006ac8e9819SChris Mason key->objectid++; 1007ac8e9819SChris Mason ret = 0; 1008ac8e9819SChris Mason overflow: 1009ac8e9819SChris Mason *num_found += found; 1010ac8e9819SChris Mason return ret; 1011ac8e9819SChris Mason } 1012ac8e9819SChris Mason 1013ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1014ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1015ac8e9819SChris Mason { 1016ac8e9819SChris Mason struct btrfs_root *root; 1017ac8e9819SChris Mason struct btrfs_key key; 1018ac8e9819SChris Mason struct btrfs_key max_key; 1019ac8e9819SChris Mason struct btrfs_path *path; 1020ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1021ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1022ac8e9819SChris Mason int ret; 1023ac8e9819SChris Mason int num_found = 0; 1024ac8e9819SChris Mason unsigned long sk_offset = 0; 1025ac8e9819SChris Mason 1026ac8e9819SChris Mason path = btrfs_alloc_path(); 1027ac8e9819SChris Mason if (!path) 1028ac8e9819SChris Mason return -ENOMEM; 1029ac8e9819SChris Mason 1030ac8e9819SChris Mason if (sk->tree_id == 0) { 1031ac8e9819SChris Mason /* search the root of the inode that was passed */ 1032ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1033ac8e9819SChris Mason } else { 1034ac8e9819SChris Mason key.objectid = sk->tree_id; 1035ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1036ac8e9819SChris Mason key.offset = (u64)-1; 1037ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1038ac8e9819SChris Mason if (IS_ERR(root)) { 1039ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1040ac8e9819SChris Mason sk->tree_id); 1041ac8e9819SChris Mason btrfs_free_path(path); 1042ac8e9819SChris Mason return -ENOENT; 1043ac8e9819SChris Mason } 1044ac8e9819SChris Mason } 1045ac8e9819SChris Mason 1046ac8e9819SChris Mason key.objectid = sk->min_objectid; 1047ac8e9819SChris Mason key.type = sk->min_type; 1048ac8e9819SChris Mason key.offset = sk->min_offset; 1049ac8e9819SChris Mason 1050ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1051ac8e9819SChris Mason max_key.type = sk->max_type; 1052ac8e9819SChris Mason max_key.offset = sk->max_offset; 1053ac8e9819SChris Mason 1054ac8e9819SChris Mason path->keep_locks = 1; 1055ac8e9819SChris Mason 1056ac8e9819SChris Mason while(1) { 1057ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1058ac8e9819SChris Mason sk->min_transid); 1059ac8e9819SChris Mason if (ret != 0) { 1060ac8e9819SChris Mason if (ret > 0) 1061ac8e9819SChris Mason ret = 0; 1062ac8e9819SChris Mason goto err; 1063ac8e9819SChris Mason } 1064ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1065ac8e9819SChris Mason &sk_offset, &num_found); 1066ac8e9819SChris Mason btrfs_release_path(root, path); 1067ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1068ac8e9819SChris Mason break; 1069ac8e9819SChris Mason 1070ac8e9819SChris Mason } 1071ac8e9819SChris Mason ret = 0; 1072ac8e9819SChris Mason err: 1073ac8e9819SChris Mason sk->nr_items = num_found; 1074ac8e9819SChris Mason btrfs_free_path(path); 1075ac8e9819SChris Mason return ret; 1076ac8e9819SChris Mason } 1077ac8e9819SChris Mason 1078ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1079ac8e9819SChris Mason void __user *argp) 1080ac8e9819SChris Mason { 1081ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1082ac8e9819SChris Mason struct inode *inode; 1083ac8e9819SChris Mason int ret; 1084ac8e9819SChris Mason 1085ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1086ac8e9819SChris Mason return -EPERM; 1087ac8e9819SChris Mason 1088ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1089ac8e9819SChris Mason if (!args) 1090ac8e9819SChris Mason return -ENOMEM; 1091ac8e9819SChris Mason 1092ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1093ac8e9819SChris Mason kfree(args); 1094ac8e9819SChris Mason return -EFAULT; 1095ac8e9819SChris Mason } 1096ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1097ac8e9819SChris Mason ret = search_ioctl(inode, args); 1098ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1099ac8e9819SChris Mason ret = -EFAULT; 1100ac8e9819SChris Mason kfree(args); 1101ac8e9819SChris Mason return ret; 1102ac8e9819SChris Mason } 1103ac8e9819SChris Mason 110498d377a0STARUISI Hiroaki /* 1105ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1106ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 110798d377a0STARUISI Hiroaki */ 110898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 110998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 111098d377a0STARUISI Hiroaki { 111198d377a0STARUISI Hiroaki struct btrfs_root *root; 111298d377a0STARUISI Hiroaki struct btrfs_key key; 1113ac8e9819SChris Mason char *ptr; 111498d377a0STARUISI Hiroaki int ret = -1; 111598d377a0STARUISI Hiroaki int slot; 111698d377a0STARUISI Hiroaki int len; 111798d377a0STARUISI Hiroaki int total_len = 0; 111898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 111998d377a0STARUISI Hiroaki struct extent_buffer *l; 112098d377a0STARUISI Hiroaki struct btrfs_path *path; 112198d377a0STARUISI Hiroaki 112298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 112398d377a0STARUISI Hiroaki name[0]='\0'; 112498d377a0STARUISI Hiroaki return 0; 112598d377a0STARUISI Hiroaki } 112698d377a0STARUISI Hiroaki 112798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 112898d377a0STARUISI Hiroaki if (!path) 112998d377a0STARUISI Hiroaki return -ENOMEM; 113098d377a0STARUISI Hiroaki 1131ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 113298d377a0STARUISI Hiroaki 113398d377a0STARUISI Hiroaki key.objectid = tree_id; 113498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 113598d377a0STARUISI Hiroaki key.offset = (u64)-1; 113698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 113798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 113898d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 113998d377a0STARUISI Hiroaki return -ENOENT; 114098d377a0STARUISI Hiroaki } 114198d377a0STARUISI Hiroaki 114298d377a0STARUISI Hiroaki key.objectid = dirid; 114398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 114498d377a0STARUISI Hiroaki key.offset = 0; 114598d377a0STARUISI Hiroaki 114698d377a0STARUISI Hiroaki while(1) { 114798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 114898d377a0STARUISI Hiroaki if (ret < 0) 114998d377a0STARUISI Hiroaki goto out; 115098d377a0STARUISI Hiroaki 115198d377a0STARUISI Hiroaki l = path->nodes[0]; 115298d377a0STARUISI Hiroaki slot = path->slots[0]; 115398d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 115498d377a0STARUISI Hiroaki 115598d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1156ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1157ac8e9819SChris Mason ret = -ENOENT; 115898d377a0STARUISI Hiroaki goto out; 1159ac8e9819SChris Mason } 116098d377a0STARUISI Hiroaki 116198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 116298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 116398d377a0STARUISI Hiroaki ptr -= len + 1; 116498d377a0STARUISI Hiroaki total_len += len + 1; 1165ac8e9819SChris Mason if (ptr < name) 116698d377a0STARUISI Hiroaki goto out; 116798d377a0STARUISI Hiroaki 116898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 116998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 117098d377a0STARUISI Hiroaki 117198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 117298d377a0STARUISI Hiroaki break; 117398d377a0STARUISI Hiroaki 117498d377a0STARUISI Hiroaki btrfs_release_path(root, path); 117598d377a0STARUISI Hiroaki key.objectid = key.offset; 117698d377a0STARUISI Hiroaki key.offset = 0; 117798d377a0STARUISI Hiroaki dirid = key.objectid; 117898d377a0STARUISI Hiroaki 117998d377a0STARUISI Hiroaki } 1180ac8e9819SChris Mason if (ptr < name) 118198d377a0STARUISI Hiroaki goto out; 1182ac8e9819SChris Mason memcpy(name, ptr, total_len); 118398d377a0STARUISI Hiroaki name[total_len]='\0'; 118498d377a0STARUISI Hiroaki ret = 0; 118598d377a0STARUISI Hiroaki out: 118698d377a0STARUISI Hiroaki btrfs_free_path(path); 1187ac8e9819SChris Mason return ret; 1188ac8e9819SChris Mason } 1189ac8e9819SChris Mason 1190ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1191ac8e9819SChris Mason void __user *argp) 1192ac8e9819SChris Mason { 1193ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1194ac8e9819SChris Mason struct inode *inode; 1195ac8e9819SChris Mason int ret; 1196ac8e9819SChris Mason 1197ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1198ac8e9819SChris Mason return -EPERM; 1199ac8e9819SChris Mason 1200ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1201ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1202ac8e9819SChris Mason kfree(args); 1203ac8e9819SChris Mason return -EFAULT; 1204ac8e9819SChris Mason } 1205ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1206ac8e9819SChris Mason 1207ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1208ac8e9819SChris Mason args->treeid, args->objectid, 1209ac8e9819SChris Mason args->name); 1210ac8e9819SChris Mason 1211ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1212ac8e9819SChris Mason ret = -EFAULT; 1213ac8e9819SChris Mason 1214ac8e9819SChris Mason kfree(args); 121598d377a0STARUISI Hiroaki return ret; 121698d377a0STARUISI Hiroaki } 121798d377a0STARUISI Hiroaki 121876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 121976dda93cSYan, Zheng void __user *arg) 122076dda93cSYan, Zheng { 122176dda93cSYan, Zheng struct dentry *parent = fdentry(file); 122276dda93cSYan, Zheng struct dentry *dentry; 122376dda93cSYan, Zheng struct inode *dir = parent->d_inode; 122476dda93cSYan, Zheng struct inode *inode; 122576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 122676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 122776dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 122876dda93cSYan, Zheng struct btrfs_trans_handle *trans; 122976dda93cSYan, Zheng int namelen; 123076dda93cSYan, Zheng int ret; 123176dda93cSYan, Zheng int err = 0; 123276dda93cSYan, Zheng 123376dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 123476dda93cSYan, Zheng return -EPERM; 123576dda93cSYan, Zheng 123676dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 123776dda93cSYan, Zheng if (IS_ERR(vol_args)) 123876dda93cSYan, Zheng return PTR_ERR(vol_args); 123976dda93cSYan, Zheng 124076dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 124176dda93cSYan, Zheng namelen = strlen(vol_args->name); 124276dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 124376dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 124476dda93cSYan, Zheng err = -EINVAL; 124576dda93cSYan, Zheng goto out; 124676dda93cSYan, Zheng } 124776dda93cSYan, Zheng 124876dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 124976dda93cSYan, Zheng if (err) 125076dda93cSYan, Zheng goto out; 125176dda93cSYan, Zheng 125276dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 125376dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 125476dda93cSYan, Zheng if (IS_ERR(dentry)) { 125576dda93cSYan, Zheng err = PTR_ERR(dentry); 125676dda93cSYan, Zheng goto out_unlock_dir; 125776dda93cSYan, Zheng } 125876dda93cSYan, Zheng 125976dda93cSYan, Zheng if (!dentry->d_inode) { 126076dda93cSYan, Zheng err = -ENOENT; 126176dda93cSYan, Zheng goto out_dput; 126276dda93cSYan, Zheng } 126376dda93cSYan, Zheng 126476dda93cSYan, Zheng inode = dentry->d_inode; 126576dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 126676dda93cSYan, Zheng err = -EINVAL; 126776dda93cSYan, Zheng goto out_dput; 126876dda93cSYan, Zheng } 126976dda93cSYan, Zheng 127076dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 127176dda93cSYan, Zheng 127276dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 127376dda93cSYan, Zheng err = d_invalidate(dentry); 127476dda93cSYan, Zheng if (err) 127576dda93cSYan, Zheng goto out_unlock; 127676dda93cSYan, Zheng 127776dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 127876dda93cSYan, Zheng 127976dda93cSYan, Zheng err = may_destroy_subvol(dest); 128076dda93cSYan, Zheng if (err) 128176dda93cSYan, Zheng goto out_up_write; 128276dda93cSYan, Zheng 128376dda93cSYan, Zheng trans = btrfs_start_transaction(root, 1); 128476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 128576dda93cSYan, Zheng dest->root_key.objectid, 128676dda93cSYan, Zheng dentry->d_name.name, 128776dda93cSYan, Zheng dentry->d_name.len); 128876dda93cSYan, Zheng BUG_ON(ret); 128976dda93cSYan, Zheng 129076dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 129176dda93cSYan, Zheng 129276dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 129376dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 129476dda93cSYan, Zheng dest->root_item.drop_level = 0; 129576dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 129676dda93cSYan, Zheng 129776dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 129876dda93cSYan, Zheng root->fs_info->tree_root, 129976dda93cSYan, Zheng dest->root_key.objectid); 130076dda93cSYan, Zheng BUG_ON(ret); 130176dda93cSYan, Zheng 130276dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 130376dda93cSYan, Zheng BUG_ON(ret); 130476dda93cSYan, Zheng inode->i_flags |= S_DEAD; 130576dda93cSYan, Zheng out_up_write: 130676dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 130776dda93cSYan, Zheng out_unlock: 130876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 130976dda93cSYan, Zheng if (!err) { 1310efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 131176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 131276dda93cSYan, Zheng d_delete(dentry); 131376dda93cSYan, Zheng } 131476dda93cSYan, Zheng out_dput: 131576dda93cSYan, Zheng dput(dentry); 131676dda93cSYan, Zheng out_unlock_dir: 131776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 131876dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 131976dda93cSYan, Zheng out: 132076dda93cSYan, Zheng kfree(vol_args); 132176dda93cSYan, Zheng return err; 132276dda93cSYan, Zheng } 132376dda93cSYan, Zheng 13241e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1325f46b5a66SChristoph Hellwig { 1326f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1327f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 13281e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1329c146afadSYan Zheng int ret; 1330c146afadSYan Zheng 1331c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1332c146afadSYan Zheng if (ret) 1333c146afadSYan Zheng return ret; 1334f46b5a66SChristoph Hellwig 1335f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1336f46b5a66SChristoph Hellwig case S_IFDIR: 1337e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1338e441d54dSChris Mason ret = -EPERM; 1339e441d54dSChris Mason goto out; 1340e441d54dSChris Mason } 1341f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 1342f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 1343f46b5a66SChristoph Hellwig break; 1344f46b5a66SChristoph Hellwig case S_IFREG: 1345e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1346e441d54dSChris Mason ret = -EINVAL; 1347e441d54dSChris Mason goto out; 1348e441d54dSChris Mason } 13491e701a32SChris Mason 13501e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 13511e701a32SChris Mason if (!range) { 13521e701a32SChris Mason ret = -ENOMEM; 13531e701a32SChris Mason goto out; 13541e701a32SChris Mason } 13551e701a32SChris Mason 13561e701a32SChris Mason if (argp) { 13571e701a32SChris Mason if (copy_from_user(range, argp, 13581e701a32SChris Mason sizeof(*range))) { 13591e701a32SChris Mason ret = -EFAULT; 13601e701a32SChris Mason kfree(range); 13611e701a32SChris Mason } 13621e701a32SChris Mason /* compression requires us to start the IO */ 13631e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13641e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 13651e701a32SChris Mason range->extent_thresh = (u32)-1; 13661e701a32SChris Mason } 13671e701a32SChris Mason } else { 13681e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 13691e701a32SChris Mason range->len = (u64)-1; 13701e701a32SChris Mason } 13711e701a32SChris Mason btrfs_defrag_file(file, range); 13721e701a32SChris Mason kfree(range); 1373f46b5a66SChristoph Hellwig break; 1374f46b5a66SChristoph Hellwig } 1375e441d54dSChris Mason out: 1376ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1377e441d54dSChris Mason return ret; 1378f46b5a66SChristoph Hellwig } 1379f46b5a66SChristoph Hellwig 1380b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1381f46b5a66SChristoph Hellwig { 1382f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1383f46b5a66SChristoph Hellwig int ret; 1384f46b5a66SChristoph Hellwig 1385e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1386e441d54dSChris Mason return -EPERM; 1387e441d54dSChris Mason 1388dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1389dae7b665SLi Zefan if (IS_ERR(vol_args)) 1390dae7b665SLi Zefan return PTR_ERR(vol_args); 1391f46b5a66SChristoph Hellwig 13925516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1393f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1394f46b5a66SChristoph Hellwig 1395f46b5a66SChristoph Hellwig kfree(vol_args); 1396f46b5a66SChristoph Hellwig return ret; 1397f46b5a66SChristoph Hellwig } 1398f46b5a66SChristoph Hellwig 1399b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1400f46b5a66SChristoph Hellwig { 1401f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1402f46b5a66SChristoph Hellwig int ret; 1403f46b5a66SChristoph Hellwig 1404e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1405e441d54dSChris Mason return -EPERM; 1406e441d54dSChris Mason 1407c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1408c146afadSYan Zheng return -EROFS; 1409c146afadSYan Zheng 1410dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1411dae7b665SLi Zefan if (IS_ERR(vol_args)) 1412dae7b665SLi Zefan return PTR_ERR(vol_args); 1413f46b5a66SChristoph Hellwig 14145516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1415f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1416f46b5a66SChristoph Hellwig 1417f46b5a66SChristoph Hellwig kfree(vol_args); 1418f46b5a66SChristoph Hellwig return ret; 1419f46b5a66SChristoph Hellwig } 1420f46b5a66SChristoph Hellwig 142176dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1422b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1423f46b5a66SChristoph Hellwig { 1424f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1425f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1426f46b5a66SChristoph Hellwig struct file *src_file; 1427f46b5a66SChristoph Hellwig struct inode *src; 1428f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1429f46b5a66SChristoph Hellwig struct btrfs_path *path; 1430f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1431ae01a0abSYan Zheng char *buf; 1432ae01a0abSYan Zheng struct btrfs_key key; 1433f46b5a66SChristoph Hellwig u32 nritems; 1434f46b5a66SChristoph Hellwig int slot; 1435ae01a0abSYan Zheng int ret; 1436c5c9cd4dSSage Weil u64 len = olen; 1437c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1438c5c9cd4dSSage Weil u64 hint_byte; 1439d20f7043SChris Mason 1440c5c9cd4dSSage Weil /* 1441c5c9cd4dSSage Weil * TODO: 1442c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1443c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1444c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1445c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1446c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1447c5c9cd4dSSage Weil * they don't overlap)? 1448c5c9cd4dSSage Weil */ 1449c5c9cd4dSSage Weil 1450e441d54dSChris Mason /* the destination must be opened for writing */ 1451e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 1452e441d54dSChris Mason return -EINVAL; 1453e441d54dSChris Mason 1454c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1455c146afadSYan Zheng if (ret) 1456c146afadSYan Zheng return ret; 1457c146afadSYan Zheng 1458c5c9cd4dSSage Weil src_file = fget(srcfd); 1459ab67b7c1SYan Zheng if (!src_file) { 1460ab67b7c1SYan Zheng ret = -EBADF; 1461ab67b7c1SYan Zheng goto out_drop_write; 1462ab67b7c1SYan Zheng } 1463f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1464f46b5a66SChristoph Hellwig 1465c5c9cd4dSSage Weil ret = -EINVAL; 1466c5c9cd4dSSage Weil if (src == inode) 1467c5c9cd4dSSage Weil goto out_fput; 1468c5c9cd4dSSage Weil 1469ae01a0abSYan Zheng ret = -EISDIR; 1470ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1471f46b5a66SChristoph Hellwig goto out_fput; 1472f46b5a66SChristoph Hellwig 1473ae01a0abSYan Zheng ret = -EXDEV; 1474ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1475ae01a0abSYan Zheng goto out_fput; 1476ae01a0abSYan Zheng 1477ae01a0abSYan Zheng ret = -ENOMEM; 1478ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1479ae01a0abSYan Zheng if (!buf) 1480ae01a0abSYan Zheng goto out_fput; 1481ae01a0abSYan Zheng 1482ae01a0abSYan Zheng path = btrfs_alloc_path(); 1483ae01a0abSYan Zheng if (!path) { 1484ae01a0abSYan Zheng vfree(buf); 1485ae01a0abSYan Zheng goto out_fput; 1486ae01a0abSYan Zheng } 1487ae01a0abSYan Zheng path->reada = 2; 1488ae01a0abSYan Zheng 1489f46b5a66SChristoph Hellwig if (inode < src) { 1490f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1491f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1492f46b5a66SChristoph Hellwig } else { 1493f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1494f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1495f46b5a66SChristoph Hellwig } 1496f46b5a66SChristoph Hellwig 1497c5c9cd4dSSage Weil /* determine range to clone */ 1498c5c9cd4dSSage Weil ret = -EINVAL; 1499c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 1500f46b5a66SChristoph Hellwig goto out_unlock; 1501c5c9cd4dSSage Weil if (len == 0) 1502c5c9cd4dSSage Weil olen = len = src->i_size - off; 1503c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1504c5c9cd4dSSage Weil if (off + len == src->i_size) 1505c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1506c5c9cd4dSSage Weil - off; 1507c5c9cd4dSSage Weil 1508c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1509c5c9cd4dSSage Weil if ((off & (bs-1)) || 1510c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1511c5c9cd4dSSage Weil goto out_unlock; 1512c5c9cd4dSSage Weil 1513f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1514f46b5a66SChristoph Hellwig another, and lock file content */ 1515f46b5a66SChristoph Hellwig while (1) { 151631840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1517c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1518c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1519ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1520f46b5a66SChristoph Hellwig break; 1521c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1522ae01a0abSYan Zheng if (ordered) 1523ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1524c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1525f46b5a66SChristoph Hellwig } 1526f46b5a66SChristoph Hellwig 1527ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 1528ae01a0abSYan Zheng BUG_ON(!trans); 1529ae01a0abSYan Zheng 1530c5c9cd4dSSage Weil /* punch hole in destination first */ 1531920bbbfbSYan, Zheng btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); 1532c5c9cd4dSSage Weil 1533c5c9cd4dSSage Weil /* clone data */ 1534f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1535ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1536ae01a0abSYan Zheng key.offset = 0; 1537f46b5a66SChristoph Hellwig 1538f46b5a66SChristoph Hellwig while (1) { 1539f46b5a66SChristoph Hellwig /* 1540f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1541f46b5a66SChristoph Hellwig * tree. 1542f46b5a66SChristoph Hellwig */ 1543f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 1544f46b5a66SChristoph Hellwig if (ret < 0) 1545f46b5a66SChristoph Hellwig goto out; 1546f46b5a66SChristoph Hellwig 1547ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1548ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1549f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1550f46b5a66SChristoph Hellwig if (ret < 0) 1551f46b5a66SChristoph Hellwig goto out; 1552f46b5a66SChristoph Hellwig if (ret > 0) 1553f46b5a66SChristoph Hellwig break; 1554ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1555f46b5a66SChristoph Hellwig } 1556f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1557f46b5a66SChristoph Hellwig slot = path->slots[0]; 1558f46b5a66SChristoph Hellwig 1559ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1560d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1561f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1562f46b5a66SChristoph Hellwig break; 1563f46b5a66SChristoph Hellwig 1564c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1565c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1566c5c9cd4dSSage Weil int type; 156731840ae1SZheng Yan u32 size; 156831840ae1SZheng Yan struct btrfs_key new_key; 1569c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1570c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1571c5c9cd4dSSage Weil u8 comp; 157231840ae1SZheng Yan 157331840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 157431840ae1SZheng Yan read_extent_buffer(leaf, buf, 157531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 157631840ae1SZheng Yan size); 1577c5c9cd4dSSage Weil 1578c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1579c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1580c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1581c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1582c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1583c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1584d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1585d397712bSChris Mason extent); 1586d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1587d397712bSChris Mason extent); 1588c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1589d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1590d397712bSChris Mason extent); 1591c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1592c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1593c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1594c5c9cd4dSSage Weil extent); 1595c5c9cd4dSSage Weil } 159631840ae1SZheng Yan btrfs_release_path(root, path); 159731840ae1SZheng Yan 1598c5c9cd4dSSage Weil if (key.offset + datal < off || 1599c5c9cd4dSSage Weil key.offset >= off+len) 1600c5c9cd4dSSage Weil goto next; 1601c5c9cd4dSSage Weil 160231840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 160331840ae1SZheng Yan new_key.objectid = inode->i_ino; 1604c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1605c5c9cd4dSSage Weil 1606c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1607c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 160831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 160931840ae1SZheng Yan &new_key, size); 161031840ae1SZheng Yan if (ret) 161131840ae1SZheng Yan goto out; 161231840ae1SZheng Yan 161331840ae1SZheng Yan leaf = path->nodes[0]; 161431840ae1SZheng Yan slot = path->slots[0]; 161531840ae1SZheng Yan write_extent_buffer(leaf, buf, 161631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 161731840ae1SZheng Yan size); 1618ae01a0abSYan Zheng 1619f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1620f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1621c5c9cd4dSSage Weil 1622c5c9cd4dSSage Weil if (off > key.offset) { 1623c5c9cd4dSSage Weil datao += off - key.offset; 1624c5c9cd4dSSage Weil datal -= off - key.offset; 1625c5c9cd4dSSage Weil } 1626ac6889cbSChris Mason 1627ac6889cbSChris Mason if (key.offset + datal > off + len) 1628ac6889cbSChris Mason datal = off + len - key.offset; 1629ac6889cbSChris Mason 1630c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1631c5c9cd4dSSage Weil if (!disko) 1632c5c9cd4dSSage Weil datao = 0; 1633c5c9cd4dSSage Weil 1634c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1635c5c9cd4dSSage Weil datao); 1636c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1637c5c9cd4dSSage Weil datal); 1638c5c9cd4dSSage Weil if (disko) { 1639c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1640ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 16415d4f98a2SYan Zheng disko, diskl, 0, 1642f46b5a66SChristoph Hellwig root->root_key.objectid, 16435d4f98a2SYan Zheng inode->i_ino, 16445d4f98a2SYan Zheng new_key.offset - datao); 1645ae01a0abSYan Zheng BUG_ON(ret); 1646f46b5a66SChristoph Hellwig } 1647c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1648c5c9cd4dSSage Weil u64 skip = 0; 1649c5c9cd4dSSage Weil u64 trim = 0; 1650c5c9cd4dSSage Weil if (off > key.offset) { 1651c5c9cd4dSSage Weil skip = off - key.offset; 1652c5c9cd4dSSage Weil new_key.offset += skip; 165331840ae1SZheng Yan } 1654d397712bSChris Mason 1655c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1656c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1657d397712bSChris Mason 1658c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1659c5c9cd4dSSage Weil ret = -EINVAL; 1660c5c9cd4dSSage Weil goto out; 166131840ae1SZheng Yan } 1662c5c9cd4dSSage Weil size -= skip + trim; 1663c5c9cd4dSSage Weil datal -= skip + trim; 1664c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1665c5c9cd4dSSage Weil &new_key, size); 1666c5c9cd4dSSage Weil if (ret) 1667c5c9cd4dSSage Weil goto out; 1668c5c9cd4dSSage Weil 1669c5c9cd4dSSage Weil if (skip) { 1670d397712bSChris Mason u32 start = 1671d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1672c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1673c5c9cd4dSSage Weil datal); 1674c5c9cd4dSSage Weil } 1675c5c9cd4dSSage Weil 1676c5c9cd4dSSage Weil leaf = path->nodes[0]; 1677c5c9cd4dSSage Weil slot = path->slots[0]; 1678c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1679c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1680c5c9cd4dSSage Weil size); 1681c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1682c5c9cd4dSSage Weil } 1683c5c9cd4dSSage Weil 1684c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1685c5c9cd4dSSage Weil } 1686c5c9cd4dSSage Weil 1687c5c9cd4dSSage Weil next: 168831840ae1SZheng Yan btrfs_release_path(root, path); 1689ae01a0abSYan Zheng key.offset++; 1690ae01a0abSYan Zheng } 1691f46b5a66SChristoph Hellwig ret = 0; 1692f46b5a66SChristoph Hellwig out: 1693ae01a0abSYan Zheng btrfs_release_path(root, path); 1694ae01a0abSYan Zheng if (ret == 0) { 1695ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1696c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1697c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1698ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1699ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1700ae01a0abSYan Zheng } 1701f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1702c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1703ae01a0abSYan Zheng if (ret) 1704ae01a0abSYan Zheng vmtruncate(inode, 0); 1705f46b5a66SChristoph Hellwig out_unlock: 1706f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1707f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1708ae01a0abSYan Zheng vfree(buf); 1709ae01a0abSYan Zheng btrfs_free_path(path); 1710f46b5a66SChristoph Hellwig out_fput: 1711f46b5a66SChristoph Hellwig fput(src_file); 1712ab67b7c1SYan Zheng out_drop_write: 1713ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1714f46b5a66SChristoph Hellwig return ret; 1715f46b5a66SChristoph Hellwig } 1716f46b5a66SChristoph Hellwig 17177a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1718c5c9cd4dSSage Weil { 1719c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1720c5c9cd4dSSage Weil 17217a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1722c5c9cd4dSSage Weil return -EFAULT; 1723c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1724c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1725c5c9cd4dSSage Weil } 1726c5c9cd4dSSage Weil 1727f46b5a66SChristoph Hellwig /* 1728f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1729f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1730f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1731f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1732f46b5a66SChristoph Hellwig */ 1733b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1734f46b5a66SChristoph Hellwig { 1735f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1736f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1737f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 17381ab86aedSSage Weil int ret; 1739f46b5a66SChristoph Hellwig 17401ab86aedSSage Weil ret = -EPERM; 1741df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1742f46b5a66SChristoph Hellwig goto out; 17431ab86aedSSage Weil 17441ab86aedSSage Weil ret = -EINPROGRESS; 17451ab86aedSSage Weil if (file->private_data) 17461ab86aedSSage Weil goto out; 17479ca9ee09SSage Weil 1748c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1749c146afadSYan Zheng if (ret) 1750c146afadSYan Zheng goto out; 1751c146afadSYan Zheng 17529ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 17539ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 17549ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17559ca9ee09SSage Weil 1756f46b5a66SChristoph Hellwig ret = -ENOMEM; 17571ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 17581ab86aedSSage Weil if (!trans) 17591ab86aedSSage Weil goto out_drop; 17601ab86aedSSage Weil 17611ab86aedSSage Weil file->private_data = trans; 17621ab86aedSSage Weil return 0; 17631ab86aedSSage Weil 17641ab86aedSSage Weil out_drop: 17651ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 17661ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 17671ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17681ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1769f46b5a66SChristoph Hellwig out: 1770f46b5a66SChristoph Hellwig return ret; 1771f46b5a66SChristoph Hellwig } 1772f46b5a66SChristoph Hellwig 17736ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 17746ef5ed0dSJosef Bacik { 17756ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 17766ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 17776ef5ed0dSJosef Bacik struct btrfs_root *new_root; 17786ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 17796ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 17806ef5ed0dSJosef Bacik struct btrfs_path *path; 17816ef5ed0dSJosef Bacik struct btrfs_key location; 17826ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 17836ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 17846ef5ed0dSJosef Bacik u64 features; 17856ef5ed0dSJosef Bacik u64 objectid = 0; 17866ef5ed0dSJosef Bacik u64 dir_id; 17876ef5ed0dSJosef Bacik 17886ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 17896ef5ed0dSJosef Bacik return -EPERM; 17906ef5ed0dSJosef Bacik 17916ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 17926ef5ed0dSJosef Bacik return -EFAULT; 17936ef5ed0dSJosef Bacik 17946ef5ed0dSJosef Bacik if (!objectid) 17956ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 17966ef5ed0dSJosef Bacik 17976ef5ed0dSJosef Bacik location.objectid = objectid; 17986ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 17996ef5ed0dSJosef Bacik location.offset = (u64)-1; 18006ef5ed0dSJosef Bacik 18016ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 18026ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 18036ef5ed0dSJosef Bacik return PTR_ERR(new_root); 18046ef5ed0dSJosef Bacik 18056ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 18066ef5ed0dSJosef Bacik return -ENOENT; 18076ef5ed0dSJosef Bacik 18086ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 18096ef5ed0dSJosef Bacik if (!path) 18106ef5ed0dSJosef Bacik return -ENOMEM; 18116ef5ed0dSJosef Bacik path->leave_spinning = 1; 18126ef5ed0dSJosef Bacik 18136ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 18146ef5ed0dSJosef Bacik if (!trans) { 18156ef5ed0dSJosef Bacik btrfs_free_path(path); 18166ef5ed0dSJosef Bacik return -ENOMEM; 18176ef5ed0dSJosef Bacik } 18186ef5ed0dSJosef Bacik 18196ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 18206ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 18216ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 18226ef5ed0dSJosef Bacik if (!di) { 18236ef5ed0dSJosef Bacik btrfs_free_path(path); 18246ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18256ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 18266ef5ed0dSJosef Bacik "this isn't going to work\n"); 18276ef5ed0dSJosef Bacik return -ENOENT; 18286ef5ed0dSJosef Bacik } 18296ef5ed0dSJosef Bacik 18306ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 18316ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 18326ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 18336ef5ed0dSJosef Bacik btrfs_free_path(path); 18346ef5ed0dSJosef Bacik 18356ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 18366ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 18376ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 18386ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 18396ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 18406ef5ed0dSJosef Bacik } 18416ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18426ef5ed0dSJosef Bacik 18436ef5ed0dSJosef Bacik return 0; 18446ef5ed0dSJosef Bacik } 18456ef5ed0dSJosef Bacik 18461406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 18471406e432SJosef Bacik { 18481406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 18491406e432SJosef Bacik struct btrfs_ioctl_space_info space; 18501406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 18517fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 18527fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 18531406e432SJosef Bacik struct btrfs_space_info *info; 18547fde62bfSChris Mason int alloc_size; 18551406e432SJosef Bacik int ret = 0; 18567fde62bfSChris Mason int slot_count = 0; 18571406e432SJosef Bacik 18581406e432SJosef Bacik if (copy_from_user(&space_args, 18591406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 18601406e432SJosef Bacik sizeof(space_args))) 18611406e432SJosef Bacik return -EFAULT; 18621406e432SJosef Bacik 18637fde62bfSChris Mason /* first we count slots */ 18647fde62bfSChris Mason rcu_read_lock(); 18657fde62bfSChris Mason list_for_each_entry_rcu(info, &root->fs_info->space_info, list) 18667fde62bfSChris Mason slot_count++; 18677fde62bfSChris Mason rcu_read_unlock(); 18681406e432SJosef Bacik 18697fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 18707fde62bfSChris Mason if (space_args.space_slots == 0) { 18717fde62bfSChris Mason space_args.total_spaces = slot_count; 18727fde62bfSChris Mason goto out; 18737fde62bfSChris Mason } 18747fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 18757fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 18767fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 18777fde62bfSChris Mason */ 18787fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 18797fde62bfSChris Mason return -ENOMEM; 18807fde62bfSChris Mason 18817fde62bfSChris Mason space_args.total_spaces = 0; 18827fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 18837fde62bfSChris Mason if (!dest) 18847fde62bfSChris Mason return -ENOMEM; 18857fde62bfSChris Mason dest_orig = dest; 18867fde62bfSChris Mason 18877fde62bfSChris Mason /* now we have a buffer to copy into */ 18881406e432SJosef Bacik rcu_read_lock(); 18891406e432SJosef Bacik list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { 18907fde62bfSChris Mason /* make sure we don't copy more than we allocated 18917fde62bfSChris Mason * in our buffer 18927fde62bfSChris Mason */ 18937fde62bfSChris Mason if (slot_count == 0) 18947fde62bfSChris Mason break; 18957fde62bfSChris Mason slot_count--; 18967fde62bfSChris Mason 18977fde62bfSChris Mason /* make sure userland has enough room in their buffer */ 18981406e432SJosef Bacik if (space_args.total_spaces >= space_args.space_slots) 18991406e432SJosef Bacik break; 19007fde62bfSChris Mason 19011406e432SJosef Bacik space.flags = info->flags; 19021406e432SJosef Bacik space.total_bytes = info->total_bytes; 19031406e432SJosef Bacik space.used_bytes = info->bytes_used; 19047fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 19051406e432SJosef Bacik dest++; 19061406e432SJosef Bacik space_args.total_spaces++; 19071406e432SJosef Bacik } 19081406e432SJosef Bacik rcu_read_unlock(); 19091406e432SJosef Bacik 19107fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 19117fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 19127fde62bfSChris Mason 19137fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 19147fde62bfSChris Mason ret = -EFAULT; 19157fde62bfSChris Mason 19167fde62bfSChris Mason kfree(dest_orig); 19177fde62bfSChris Mason out: 19187fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 19191406e432SJosef Bacik ret = -EFAULT; 19201406e432SJosef Bacik 19211406e432SJosef Bacik return ret; 19221406e432SJosef Bacik } 19231406e432SJosef Bacik 1924f46b5a66SChristoph Hellwig /* 1925f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1926f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1927f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1928f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1929f46b5a66SChristoph Hellwig */ 1930f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1931f46b5a66SChristoph Hellwig { 1932f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1933f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1934f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1935f46b5a66SChristoph Hellwig 1936f46b5a66SChristoph Hellwig trans = file->private_data; 19371ab86aedSSage Weil if (!trans) 19381ab86aedSSage Weil return -EINVAL; 1939b214107eSChristoph Hellwig file->private_data = NULL; 19409ca9ee09SSage Weil 19411ab86aedSSage Weil btrfs_end_transaction(trans, root); 19421ab86aedSSage Weil 19439ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19449ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 19459ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19469ca9ee09SSage Weil 1947cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 19481ab86aedSSage Weil return 0; 1949f46b5a66SChristoph Hellwig } 1950f46b5a66SChristoph Hellwig 1951f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1952f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1953f46b5a66SChristoph Hellwig { 1954f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 19554bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1956f46b5a66SChristoph Hellwig 1957f46b5a66SChristoph Hellwig switch (cmd) { 19586cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 19596cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 19606cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 19616cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 19626cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 19636cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1964f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 19654bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 19663de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 19674bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 196876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 196976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 19706ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 19716ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 1972f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 19731e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 19741e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 19751e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 1976f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 19774bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1978f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 19794bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1980f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 19814bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1982f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1983f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1984f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1985c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1986c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 19877a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1988f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1989f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1990f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1991f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1992ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 1993ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 1994ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 1995ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 19961406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 19971406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 1998f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1999f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2000f46b5a66SChristoph Hellwig return 0; 2001f46b5a66SChristoph Hellwig } 2002f46b5a66SChristoph Hellwig 2003f46b5a66SChristoph Hellwig return -ENOTTY; 2004f46b5a66SChristoph Hellwig } 2005