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> 42*5a0e3ad6STejun Heo #include <linux/slab.h> 434b4e25f2SChris Mason #include "compat.h" 44f46b5a66SChristoph Hellwig #include "ctree.h" 45f46b5a66SChristoph Hellwig #include "disk-io.h" 46f46b5a66SChristoph Hellwig #include "transaction.h" 47f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 48f46b5a66SChristoph Hellwig #include "ioctl.h" 49f46b5a66SChristoph Hellwig #include "print-tree.h" 50f46b5a66SChristoph Hellwig #include "volumes.h" 51925baeddSChris Mason #include "locking.h" 5298d377a0STARUISI Hiroaki #include "ctree.h" 53f46b5a66SChristoph Hellwig 546cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 556cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 566cbff00fSChristoph Hellwig { 576cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 586cbff00fSChristoph Hellwig return flags; 596cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 606cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 616cbff00fSChristoph Hellwig else 626cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 636cbff00fSChristoph Hellwig } 64f46b5a66SChristoph Hellwig 656cbff00fSChristoph Hellwig /* 666cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 676cbff00fSChristoph Hellwig */ 686cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 696cbff00fSChristoph Hellwig { 706cbff00fSChristoph Hellwig unsigned int iflags = 0; 716cbff00fSChristoph Hellwig 726cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 736cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 756cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 776cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 796cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 816cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 836cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 846cbff00fSChristoph Hellwig 856cbff00fSChristoph Hellwig return iflags; 866cbff00fSChristoph Hellwig } 876cbff00fSChristoph Hellwig 886cbff00fSChristoph Hellwig /* 896cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 906cbff00fSChristoph Hellwig */ 916cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 926cbff00fSChristoph Hellwig { 936cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 986cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 996cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1006cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1016cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1026cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1036cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1046cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1056cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1066cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1076cbff00fSChristoph Hellwig } 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig /* 1106cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1116cbff00fSChristoph Hellwig * 1126cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1136cbff00fSChristoph Hellwig */ 1146cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1156cbff00fSChristoph Hellwig { 1160b4dcea5SChris Mason unsigned int flags; 1170b4dcea5SChris Mason 1180b4dcea5SChris Mason if (!dir) 1190b4dcea5SChris Mason return; 1200b4dcea5SChris Mason 1210b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1226cbff00fSChristoph Hellwig 1236cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1246cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1256cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1266cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1276cbff00fSChristoph Hellwig 1286cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1296cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1336cbff00fSChristoph Hellwig { 1346cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1356cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1386cbff00fSChristoph Hellwig return -EFAULT; 1396cbff00fSChristoph Hellwig return 0; 1406cbff00fSChristoph Hellwig } 1416cbff00fSChristoph Hellwig 1426cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1436cbff00fSChristoph Hellwig { 1446cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1456cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1466cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1476cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1486cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1496cbff00fSChristoph Hellwig int ret; 1506cbff00fSChristoph Hellwig 1516cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1526cbff00fSChristoph Hellwig return -EFAULT; 1536cbff00fSChristoph Hellwig 1546cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1556cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1566cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1576cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1586cbff00fSChristoph Hellwig 1596cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1606cbff00fSChristoph Hellwig return -EACCES; 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1636cbff00fSChristoph Hellwig 1646cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1656cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1666cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1676cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1686cbff00fSChristoph Hellwig ret = -EPERM; 1696cbff00fSChristoph Hellwig goto out_unlock; 1706cbff00fSChristoph Hellwig } 1716cbff00fSChristoph Hellwig } 1726cbff00fSChristoph Hellwig 1736cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1746cbff00fSChristoph Hellwig if (ret) 1756cbff00fSChristoph Hellwig goto out_unlock; 1766cbff00fSChristoph Hellwig 1776cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1786cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1796cbff00fSChristoph Hellwig else 1806cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1816cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1826cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1836cbff00fSChristoph Hellwig else 1846cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1856cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1866cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1876cbff00fSChristoph Hellwig else 1886cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1896cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1906cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1916cbff00fSChristoph Hellwig else 1926cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1936cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1946cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1956cbff00fSChristoph Hellwig else 1966cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1976cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1986cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1996cbff00fSChristoph Hellwig else 2006cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2016cbff00fSChristoph Hellwig 2026cbff00fSChristoph Hellwig 2036cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2046cbff00fSChristoph Hellwig BUG_ON(!trans); 2056cbff00fSChristoph Hellwig 2066cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2076cbff00fSChristoph Hellwig BUG_ON(ret); 2086cbff00fSChristoph Hellwig 2096cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2106cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2116cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2126cbff00fSChristoph Hellwig 2136cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2146cbff00fSChristoph Hellwig out_unlock: 2156cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2166cbff00fSChristoph Hellwig return 0; 2176cbff00fSChristoph Hellwig } 2186cbff00fSChristoph Hellwig 2196cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2206cbff00fSChristoph Hellwig { 2216cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2226cbff00fSChristoph Hellwig 2236cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2246cbff00fSChristoph Hellwig } 225f46b5a66SChristoph Hellwig 226cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 227cb8e7090SChristoph Hellwig struct dentry *dentry, 228cb8e7090SChristoph Hellwig char *name, int namelen) 229f46b5a66SChristoph Hellwig { 230f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 231f46b5a66SChristoph Hellwig struct btrfs_key key; 232f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 233f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 234f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23576dda93cSYan, Zheng struct btrfs_root *new_root; 23676dda93cSYan, Zheng struct inode *dir = dentry->d_parent->d_inode; 237f46b5a66SChristoph Hellwig int ret; 238f46b5a66SChristoph Hellwig int err; 239f46b5a66SChristoph Hellwig u64 objectid; 240f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2413de4586cSChris Mason u64 index = 0; 242f46b5a66SChristoph Hellwig 2439ed74f2dSJosef Bacik /* 2449ed74f2dSJosef Bacik * 1 - inode item 2459ed74f2dSJosef Bacik * 2 - refs 2469ed74f2dSJosef Bacik * 1 - root item 2479ed74f2dSJosef Bacik * 2 - dir items 2489ed74f2dSJosef Bacik */ 2499ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 250f46b5a66SChristoph Hellwig if (ret) 25176dda93cSYan, Zheng return ret; 252f46b5a66SChristoph Hellwig 253f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 254f46b5a66SChristoph Hellwig BUG_ON(!trans); 255f46b5a66SChristoph Hellwig 256f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 257f46b5a66SChristoph Hellwig 0, &objectid); 258f46b5a66SChristoph Hellwig if (ret) 259f46b5a66SChristoph Hellwig goto fail; 260f46b5a66SChristoph Hellwig 2615d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2625d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2638e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2648e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2658e8a1e31SJosef Bacik goto fail; 2668e8a1e31SJosef Bacik } 267f46b5a66SChristoph Hellwig 2685d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 269f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 270f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2715d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 272f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 273f46b5a66SChristoph Hellwig 274f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 275f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 276f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2775d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2785d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2795d4f98a2SYan Zheng BTRFS_UUID_SIZE); 280f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 281f46b5a66SChristoph Hellwig 282f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 283f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 284f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 285f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 286f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 287a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 288f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 289f46b5a66SChristoph Hellwig 290f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 29184234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 292f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 293f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29486b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29580ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 296f46b5a66SChristoph Hellwig 297f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 298f46b5a66SChristoph Hellwig root_item.drop_level = 0; 299f46b5a66SChristoph Hellwig 300925baeddSChris Mason btrfs_tree_unlock(leaf); 301f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 302f46b5a66SChristoph Hellwig leaf = NULL; 303f46b5a66SChristoph Hellwig 304f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 305f46b5a66SChristoph Hellwig 306f46b5a66SChristoph Hellwig key.objectid = objectid; 3075d4f98a2SYan Zheng key.offset = 0; 308f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 309f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 310f46b5a66SChristoph Hellwig &root_item); 311f46b5a66SChristoph Hellwig if (ret) 312f46b5a66SChristoph Hellwig goto fail; 313f46b5a66SChristoph Hellwig 31476dda93cSYan, Zheng key.offset = (u64)-1; 31576dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31676dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31776dda93cSYan, Zheng 31876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31976dda93cSYan, Zheng 32076dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 32176dda93cSYan, Zheng BTRFS_I(dir)->block_group); 322f46b5a66SChristoph Hellwig /* 323f46b5a66SChristoph Hellwig * insert the directory item 324f46b5a66SChristoph Hellwig */ 3253de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3263de4586cSChris Mason BUG_ON(ret); 3273de4586cSChris Mason 3283de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 329f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3303de4586cSChris Mason BTRFS_FT_DIR, index); 331f46b5a66SChristoph Hellwig if (ret) 332f46b5a66SChristoph Hellwig goto fail; 3330660b5afSChris Mason 33452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33652c26179SYan Zheng BUG_ON(ret); 33752c26179SYan Zheng 3380660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3394df27c4dSYan, Zheng objectid, root->root_key.objectid, 3400660b5afSChris Mason dir->i_ino, index, name, namelen); 34176dda93cSYan, Zheng 3420660b5afSChris Mason BUG_ON(ret); 3430660b5afSChris Mason 34476dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 345f46b5a66SChristoph Hellwig fail: 34676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 347f46b5a66SChristoph Hellwig if (err && !ret) 348f46b5a66SChristoph Hellwig ret = err; 3499ed74f2dSJosef Bacik 3509ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 351f46b5a66SChristoph Hellwig return ret; 352f46b5a66SChristoph Hellwig } 353f46b5a66SChristoph Hellwig 3543de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 3553de4586cSChris Mason char *name, int namelen) 356f46b5a66SChristoph Hellwig { 3572e4bfab9SYan, Zheng struct inode *inode; 358f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 359f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3602e4bfab9SYan, Zheng int ret; 361f46b5a66SChristoph Hellwig 362f46b5a66SChristoph Hellwig if (!root->ref_cows) 363f46b5a66SChristoph Hellwig return -EINVAL; 364f46b5a66SChristoph Hellwig 3659ed74f2dSJosef Bacik /* 3669ed74f2dSJosef Bacik * 1 - inode item 3679ed74f2dSJosef Bacik * 2 - refs 3689ed74f2dSJosef Bacik * 1 - root item 3699ed74f2dSJosef Bacik * 2 - dir items 3709ed74f2dSJosef Bacik */ 3719ed74f2dSJosef Bacik ret = btrfs_reserve_metadata_space(root, 6); 372f46b5a66SChristoph Hellwig if (ret) 3732e4bfab9SYan, Zheng goto fail; 374f46b5a66SChristoph Hellwig 3753de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 376f46b5a66SChristoph Hellwig if (!pending_snapshot) { 377f46b5a66SChristoph Hellwig ret = -ENOMEM; 3789ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3792e4bfab9SYan, Zheng goto fail; 380f46b5a66SChristoph Hellwig } 381f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 382f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 383f46b5a66SChristoph Hellwig ret = -ENOMEM; 384f46b5a66SChristoph Hellwig kfree(pending_snapshot); 3859ed74f2dSJosef Bacik btrfs_unreserve_metadata_space(root, 6); 3862e4bfab9SYan, Zheng goto fail; 387f46b5a66SChristoph Hellwig } 388f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 389f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 3903de4586cSChris Mason pending_snapshot->dentry = dentry; 391f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 392f46b5a66SChristoph Hellwig BUG_ON(!trans); 393f46b5a66SChristoph Hellwig pending_snapshot->root = root; 394f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 395f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 3962e4bfab9SYan, Zheng ret = btrfs_commit_transaction(trans, root); 3972e4bfab9SYan, Zheng BUG_ON(ret); 3982e4bfab9SYan, Zheng btrfs_unreserve_metadata_space(root, 6); 399f46b5a66SChristoph Hellwig 4002e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 4012e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4022e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4032e4bfab9SYan, Zheng goto fail; 4042e4bfab9SYan, Zheng } 4052e4bfab9SYan, Zheng BUG_ON(!inode); 4062e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4072e4bfab9SYan, Zheng ret = 0; 4082e4bfab9SYan, Zheng fail: 409f46b5a66SChristoph Hellwig return ret; 410f46b5a66SChristoph Hellwig } 411f46b5a66SChristoph Hellwig 412cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 413cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 414cb8e7090SChristoph Hellwig { 415cb8e7090SChristoph Hellwig if (child->d_inode) 416cb8e7090SChristoph Hellwig return -EEXIST; 417cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 418cb8e7090SChristoph Hellwig return -ENOENT; 419cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 420cb8e7090SChristoph Hellwig } 421cb8e7090SChristoph Hellwig 422cb8e7090SChristoph Hellwig /* 423cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 424cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 425cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 426cb8e7090SChristoph Hellwig */ 42776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 42876dda93cSYan, Zheng char *name, int namelen, 4293de4586cSChris Mason struct btrfs_root *snap_src) 430cb8e7090SChristoph Hellwig { 43176dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 432cb8e7090SChristoph Hellwig struct dentry *dentry; 433cb8e7090SChristoph Hellwig int error; 434cb8e7090SChristoph Hellwig 43576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 436cb8e7090SChristoph Hellwig 437cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 438cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 439cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 440cb8e7090SChristoph Hellwig goto out_unlock; 441cb8e7090SChristoph Hellwig 442cb8e7090SChristoph Hellwig error = -EEXIST; 443cb8e7090SChristoph Hellwig if (dentry->d_inode) 444cb8e7090SChristoph Hellwig goto out_dput; 445cb8e7090SChristoph Hellwig 446cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 447cb8e7090SChristoph Hellwig if (error) 448cb8e7090SChristoph Hellwig goto out_dput; 449cb8e7090SChristoph Hellwig 45076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 451cb8e7090SChristoph Hellwig if (error) 452cb8e7090SChristoph Hellwig goto out_drop_write; 453cb8e7090SChristoph Hellwig 45476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 45576dda93cSYan, Zheng 45676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 45776dda93cSYan, Zheng goto out_up_read; 45876dda93cSYan, Zheng 4593de4586cSChris Mason if (snap_src) { 46076dda93cSYan, Zheng error = create_snapshot(snap_src, dentry, 46176dda93cSYan, Zheng name, namelen); 4623de4586cSChris Mason } else { 46376dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 46476dda93cSYan, Zheng name, namelen); 4653de4586cSChris Mason } 46676dda93cSYan, Zheng if (!error) 46776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 46876dda93cSYan, Zheng out_up_read: 46976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 470cb8e7090SChristoph Hellwig out_drop_write: 471cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 472cb8e7090SChristoph Hellwig out_dput: 473cb8e7090SChristoph Hellwig dput(dentry); 474cb8e7090SChristoph Hellwig out_unlock: 47576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 476cb8e7090SChristoph Hellwig return error; 477cb8e7090SChristoph Hellwig } 478cb8e7090SChristoph Hellwig 479940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 4801e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 4811e701a32SChris Mason u64 *defrag_end) 482940100a4SChris Mason { 483940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 484940100a4SChris Mason struct extent_map *em = NULL; 485940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 486940100a4SChris Mason int ret = 1; 487940100a4SChris Mason 4881e701a32SChris Mason 4891e701a32SChris Mason if (thresh == 0) 4901e701a32SChris Mason thresh = 256 * 1024; 4911e701a32SChris Mason 492940100a4SChris Mason /* 493940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 494940100a4SChris Mason * defragging it 495940100a4SChris Mason */ 496940100a4SChris Mason if (start < *defrag_end) 497940100a4SChris Mason return 1; 498940100a4SChris Mason 499940100a4SChris Mason *skip = 0; 500940100a4SChris Mason 501940100a4SChris Mason /* 502940100a4SChris Mason * hopefully we have this extent in the tree already, try without 503940100a4SChris Mason * the full extent lock 504940100a4SChris Mason */ 505940100a4SChris Mason read_lock(&em_tree->lock); 506940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 507940100a4SChris Mason read_unlock(&em_tree->lock); 508940100a4SChris Mason 509940100a4SChris Mason if (!em) { 510940100a4SChris Mason /* get the big lock and read metadata off disk */ 511940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 512940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 513940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 514940100a4SChris Mason 515940100a4SChris Mason if (!em) 516940100a4SChris Mason return 0; 517940100a4SChris Mason } 518940100a4SChris Mason 519940100a4SChris Mason /* this will cover holes, and inline extents */ 520940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 521940100a4SChris Mason ret = 0; 522940100a4SChris Mason 523940100a4SChris Mason /* 524940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 525940100a4SChris Mason */ 5261e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 527940100a4SChris Mason ret = 0; 528940100a4SChris Mason 529940100a4SChris Mason /* 530940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 531940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 532940100a4SChris Mason * so that the next tiny extent will force a defrag. 533940100a4SChris Mason * 534940100a4SChris Mason * The end result of this is that tiny extents before a single big 535940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 536940100a4SChris Mason */ 537940100a4SChris Mason if (ret) { 538940100a4SChris Mason *last_len += len; 539940100a4SChris Mason *defrag_end = extent_map_end(em); 540940100a4SChris Mason } else { 541940100a4SChris Mason *last_len = 0; 542940100a4SChris Mason *skip = extent_map_end(em); 543940100a4SChris Mason *defrag_end = 0; 544940100a4SChris Mason } 545940100a4SChris Mason 546940100a4SChris Mason free_extent_map(em); 547940100a4SChris Mason return ret; 548940100a4SChris Mason } 549940100a4SChris Mason 5501e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 5511e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 552f46b5a66SChristoph Hellwig { 553f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 554f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 555f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5563eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 557f46b5a66SChristoph Hellwig struct page *page; 558f46b5a66SChristoph Hellwig unsigned long last_index; 559f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 560f46b5a66SChristoph Hellwig unsigned long total_read = 0; 561f46b5a66SChristoph Hellwig u64 page_start; 562f46b5a66SChristoph Hellwig u64 page_end; 563940100a4SChris Mason u64 last_len = 0; 564940100a4SChris Mason u64 skip = 0; 565940100a4SChris Mason u64 defrag_end = 0; 566f46b5a66SChristoph Hellwig unsigned long i; 567f46b5a66SChristoph Hellwig int ret; 568f46b5a66SChristoph Hellwig 569940100a4SChris Mason if (inode->i_size == 0) 570940100a4SChris Mason return 0; 571f46b5a66SChristoph Hellwig 5721e701a32SChris Mason if (range->start + range->len > range->start) { 5731e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 5741e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 5751e701a32SChris Mason } else { 576940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 5771e701a32SChris Mason } 5781e701a32SChris Mason 5791e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 580940100a4SChris Mason while (i <= last_index) { 581940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 5821e701a32SChris Mason PAGE_CACHE_SIZE, 5831e701a32SChris Mason range->extent_thresh, 5841e701a32SChris Mason &last_len, &skip, 585940100a4SChris Mason &defrag_end)) { 586940100a4SChris Mason unsigned long next; 587940100a4SChris Mason /* 588940100a4SChris Mason * the should_defrag function tells us how much to skip 589940100a4SChris Mason * bump our counter by the suggested amount 590940100a4SChris Mason */ 591940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 592940100a4SChris Mason i = max(i + 1, next); 593940100a4SChris Mason continue; 594940100a4SChris Mason } 595940100a4SChris Mason 596f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 597f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 598f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 599f46b5a66SChristoph Hellwig } 600f46b5a66SChristoph Hellwig total_read++; 601940100a4SChris Mason mutex_lock(&inode->i_mutex); 6021e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6031e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 604940100a4SChris Mason 605940100a4SChris Mason ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); 606940100a4SChris Mason if (ret) { 607940100a4SChris Mason ret = -ENOSPC; 608940100a4SChris Mason break; 609940100a4SChris Mason } 610940100a4SChris Mason 611940100a4SChris Mason ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); 612940100a4SChris Mason if (ret) { 613940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 614940100a4SChris Mason PAGE_CACHE_SIZE); 615940100a4SChris Mason ret = -ENOSPC; 616940100a4SChris Mason break; 617940100a4SChris Mason } 6183eaa2885SChris Mason again: 619940100a4SChris Mason if (inode->i_size == 0 || 620940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 621940100a4SChris Mason ret = 0; 622940100a4SChris Mason goto err_reservations; 623940100a4SChris Mason } 624940100a4SChris Mason 625f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 626f46b5a66SChristoph Hellwig if (!page) 627940100a4SChris Mason goto err_reservations; 628940100a4SChris Mason 629f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 630f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 631f46b5a66SChristoph Hellwig lock_page(page); 632f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 633f46b5a66SChristoph Hellwig unlock_page(page); 634f46b5a66SChristoph Hellwig page_cache_release(page); 635940100a4SChris Mason goto err_reservations; 636f46b5a66SChristoph Hellwig } 637f46b5a66SChristoph Hellwig } 638f46b5a66SChristoph Hellwig 639940100a4SChris Mason if (page->mapping != inode->i_mapping) { 640940100a4SChris Mason unlock_page(page); 641940100a4SChris Mason page_cache_release(page); 642940100a4SChris Mason goto again; 643940100a4SChris Mason } 644940100a4SChris Mason 645f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 646f46b5a66SChristoph Hellwig 647940100a4SChris Mason if (PageDirty(page)) { 648940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 649940100a4SChris Mason PAGE_CACHE_SIZE); 650940100a4SChris Mason goto loop_unlock; 651940100a4SChris Mason } 652940100a4SChris Mason 653f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 654f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 655f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 6563eaa2885SChris Mason 6573eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 6583eaa2885SChris Mason if (ordered) { 6593eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 6603eaa2885SChris Mason unlock_page(page); 6613eaa2885SChris Mason page_cache_release(page); 6623eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 6633eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 6643eaa2885SChris Mason goto again; 6653eaa2885SChris Mason } 6663eaa2885SChris Mason set_page_extent_mapped(page); 6673eaa2885SChris Mason 668f87f057bSChris Mason /* 669f87f057bSChris Mason * this makes sure page_mkwrite is called on the 670f87f057bSChris Mason * page if it is dirtied again later 671f87f057bSChris Mason */ 672f87f057bSChris Mason clear_page_dirty_for_io(page); 673940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 674940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 675940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 676f87f057bSChris Mason 6772ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 678940100a4SChris Mason ClearPageChecked(page); 679f46b5a66SChristoph Hellwig set_page_dirty(page); 680a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 681940100a4SChris Mason 682940100a4SChris Mason loop_unlock: 683f46b5a66SChristoph Hellwig unlock_page(page); 684f46b5a66SChristoph Hellwig page_cache_release(page); 685940100a4SChris Mason mutex_unlock(&inode->i_mutex); 686940100a4SChris Mason 687940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 688f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 689940100a4SChris Mason i++; 690f46b5a66SChristoph Hellwig } 691f46b5a66SChristoph Hellwig 6921e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 6931e701a32SChris Mason filemap_flush(inode->i_mapping); 6941e701a32SChris Mason 6951e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 6961e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 6971e701a32SChris Mason * we have to make sure the IO is actually started and that 6981e701a32SChris Mason * ordered extents get created before we return 6991e701a32SChris Mason */ 7001e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 7011e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7021e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7031e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7041e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7051e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7061e701a32SChris Mason } 7071e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7081e701a32SChris Mason 7091e701a32SChris Mason mutex_lock(&inode->i_mutex); 7101e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7111e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7121e701a32SChris Mason } 7131e701a32SChris Mason 714f46b5a66SChristoph Hellwig return 0; 715940100a4SChris Mason 716940100a4SChris Mason err_reservations: 717940100a4SChris Mason mutex_unlock(&inode->i_mutex); 718940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); 719940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 720940100a4SChris Mason return ret; 721f46b5a66SChristoph Hellwig } 722f46b5a66SChristoph Hellwig 72376dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 72476dda93cSYan, Zheng void __user *arg) 725f46b5a66SChristoph Hellwig { 726f46b5a66SChristoph Hellwig u64 new_size; 727f46b5a66SChristoph Hellwig u64 old_size; 728f46b5a66SChristoph Hellwig u64 devid = 1; 729f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 730f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 731f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 732f46b5a66SChristoph Hellwig char *sizestr; 733f46b5a66SChristoph Hellwig char *devstr = NULL; 734f46b5a66SChristoph Hellwig int ret = 0; 735f46b5a66SChristoph Hellwig int namelen; 736f46b5a66SChristoph Hellwig int mod = 0; 737f46b5a66SChristoph Hellwig 738c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 739c146afadSYan Zheng return -EROFS; 740c146afadSYan Zheng 741e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 742e441d54dSChris Mason return -EPERM; 743e441d54dSChris Mason 744dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 745dae7b665SLi Zefan if (IS_ERR(vol_args)) 746dae7b665SLi Zefan return PTR_ERR(vol_args); 7475516e595SMark Fasheh 7485516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 749f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 750f46b5a66SChristoph Hellwig 7517d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 752f46b5a66SChristoph Hellwig sizestr = vol_args->name; 753f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 754f46b5a66SChristoph Hellwig if (devstr) { 755f46b5a66SChristoph Hellwig char *end; 756f46b5a66SChristoph Hellwig sizestr = devstr + 1; 757f46b5a66SChristoph Hellwig *devstr = '\0'; 758f46b5a66SChristoph Hellwig devstr = vol_args->name; 759f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 76021380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 76121380931SJoel Becker (unsigned long long)devid); 762f46b5a66SChristoph Hellwig } 7632b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 764f46b5a66SChristoph Hellwig if (!device) { 76521380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 76621380931SJoel Becker (unsigned long long)devid); 767f46b5a66SChristoph Hellwig ret = -EINVAL; 768f46b5a66SChristoph Hellwig goto out_unlock; 769f46b5a66SChristoph Hellwig } 770f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 771f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 772f46b5a66SChristoph Hellwig else { 773f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 774f46b5a66SChristoph Hellwig mod = -1; 775f46b5a66SChristoph Hellwig sizestr++; 776f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 777f46b5a66SChristoph Hellwig mod = 1; 778f46b5a66SChristoph Hellwig sizestr++; 779f46b5a66SChristoph Hellwig } 78091748467SAkinobu Mita new_size = memparse(sizestr, NULL); 781f46b5a66SChristoph Hellwig if (new_size == 0) { 782f46b5a66SChristoph Hellwig ret = -EINVAL; 783f46b5a66SChristoph Hellwig goto out_unlock; 784f46b5a66SChristoph Hellwig } 785f46b5a66SChristoph Hellwig } 786f46b5a66SChristoph Hellwig 787f46b5a66SChristoph Hellwig old_size = device->total_bytes; 788f46b5a66SChristoph Hellwig 789f46b5a66SChristoph Hellwig if (mod < 0) { 790f46b5a66SChristoph Hellwig if (new_size > old_size) { 791f46b5a66SChristoph Hellwig ret = -EINVAL; 792f46b5a66SChristoph Hellwig goto out_unlock; 793f46b5a66SChristoph Hellwig } 794f46b5a66SChristoph Hellwig new_size = old_size - new_size; 795f46b5a66SChristoph Hellwig } else if (mod > 0) { 796f46b5a66SChristoph Hellwig new_size = old_size + new_size; 797f46b5a66SChristoph Hellwig } 798f46b5a66SChristoph Hellwig 799f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 800f46b5a66SChristoph Hellwig ret = -EINVAL; 801f46b5a66SChristoph Hellwig goto out_unlock; 802f46b5a66SChristoph Hellwig } 803f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 804f46b5a66SChristoph Hellwig ret = -EFBIG; 805f46b5a66SChristoph Hellwig goto out_unlock; 806f46b5a66SChristoph Hellwig } 807f46b5a66SChristoph Hellwig 808f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 809f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 810f46b5a66SChristoph Hellwig 811f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 812f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 813f46b5a66SChristoph Hellwig 814f46b5a66SChristoph Hellwig if (new_size > old_size) { 815f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 816f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 817f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 818f46b5a66SChristoph Hellwig } else { 819f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 820f46b5a66SChristoph Hellwig } 821f46b5a66SChristoph Hellwig 822f46b5a66SChristoph Hellwig out_unlock: 8237d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 824f46b5a66SChristoph Hellwig kfree(vol_args); 825f46b5a66SChristoph Hellwig return ret; 826f46b5a66SChristoph Hellwig } 827f46b5a66SChristoph Hellwig 828cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 8293de4586cSChris Mason void __user *arg, int subvol) 830f46b5a66SChristoph Hellwig { 831cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 832f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 8333de4586cSChris Mason struct file *src_file; 834f46b5a66SChristoph Hellwig int namelen; 8353de4586cSChris Mason int ret = 0; 836f46b5a66SChristoph Hellwig 837c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 838c146afadSYan Zheng return -EROFS; 839c146afadSYan Zheng 840dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 841dae7b665SLi Zefan if (IS_ERR(vol_args)) 842dae7b665SLi Zefan return PTR_ERR(vol_args); 843f46b5a66SChristoph Hellwig 8445516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 845f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 846f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 847f46b5a66SChristoph Hellwig ret = -EINVAL; 848f46b5a66SChristoph Hellwig goto out; 849f46b5a66SChristoph Hellwig } 850f46b5a66SChristoph Hellwig 8513de4586cSChris Mason if (subvol) { 85276dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 85376dda93cSYan, Zheng NULL); 854cb8e7090SChristoph Hellwig } else { 8553de4586cSChris Mason struct inode *src_inode; 8563de4586cSChris Mason src_file = fget(vol_args->fd); 8573de4586cSChris Mason if (!src_file) { 8583de4586cSChris Mason ret = -EINVAL; 8593de4586cSChris Mason goto out; 8603de4586cSChris Mason } 8613de4586cSChris Mason 8623de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 8633de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 864d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 865d397712bSChris Mason "another FS\n"); 8663de4586cSChris Mason ret = -EINVAL; 8673de4586cSChris Mason fput(src_file); 8683de4586cSChris Mason goto out; 8693de4586cSChris Mason } 87076dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 87176dda93cSYan, Zheng BTRFS_I(src_inode)->root); 8723de4586cSChris Mason fput(src_file); 873cb8e7090SChristoph Hellwig } 874f46b5a66SChristoph Hellwig out: 875f46b5a66SChristoph Hellwig kfree(vol_args); 876f46b5a66SChristoph Hellwig return ret; 877f46b5a66SChristoph Hellwig } 878f46b5a66SChristoph Hellwig 87976dda93cSYan, Zheng /* 88076dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 88176dda93cSYan, Zheng */ 88276dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 88376dda93cSYan, Zheng { 88476dda93cSYan, Zheng struct btrfs_path *path; 88576dda93cSYan, Zheng struct btrfs_key key; 88676dda93cSYan, Zheng int ret; 88776dda93cSYan, Zheng 88876dda93cSYan, Zheng path = btrfs_alloc_path(); 88976dda93cSYan, Zheng if (!path) 89076dda93cSYan, Zheng return -ENOMEM; 89176dda93cSYan, Zheng 89276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 89376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 89476dda93cSYan, Zheng key.offset = (u64)-1; 89576dda93cSYan, Zheng 89676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 89776dda93cSYan, Zheng &key, path, 0, 0); 89876dda93cSYan, Zheng if (ret < 0) 89976dda93cSYan, Zheng goto out; 90076dda93cSYan, Zheng BUG_ON(ret == 0); 90176dda93cSYan, Zheng 90276dda93cSYan, Zheng ret = 0; 90376dda93cSYan, Zheng if (path->slots[0] > 0) { 90476dda93cSYan, Zheng path->slots[0]--; 90576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 90676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 90776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 90876dda93cSYan, Zheng ret = -ENOTEMPTY; 90976dda93cSYan, Zheng } 91076dda93cSYan, Zheng out: 91176dda93cSYan, Zheng btrfs_free_path(path); 91276dda93cSYan, Zheng return ret; 91376dda93cSYan, Zheng } 91476dda93cSYan, Zheng 915ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 916ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 917ac8e9819SChris Mason { 918abc6e134SChris Mason struct btrfs_key test; 919abc6e134SChris Mason int ret; 920abc6e134SChris Mason 921abc6e134SChris Mason test.objectid = sk->min_objectid; 922abc6e134SChris Mason test.type = sk->min_type; 923abc6e134SChris Mason test.offset = sk->min_offset; 924abc6e134SChris Mason 925abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 926abc6e134SChris Mason if (ret < 0) 927ac8e9819SChris Mason return 0; 928abc6e134SChris Mason 929abc6e134SChris Mason test.objectid = sk->max_objectid; 930abc6e134SChris Mason test.type = sk->max_type; 931abc6e134SChris Mason test.offset = sk->max_offset; 932abc6e134SChris Mason 933abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 934abc6e134SChris Mason if (ret > 0) 935ac8e9819SChris Mason return 0; 936ac8e9819SChris Mason return 1; 937ac8e9819SChris Mason } 938ac8e9819SChris Mason 939ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 940ac8e9819SChris Mason struct btrfs_path *path, 941ac8e9819SChris Mason struct btrfs_key *key, 942ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 943ac8e9819SChris Mason char *buf, 944ac8e9819SChris Mason unsigned long *sk_offset, 945ac8e9819SChris Mason int *num_found) 946ac8e9819SChris Mason { 947ac8e9819SChris Mason u64 found_transid; 948ac8e9819SChris Mason struct extent_buffer *leaf; 949ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 950ac8e9819SChris Mason unsigned long item_off; 951ac8e9819SChris Mason unsigned long item_len; 952ac8e9819SChris Mason int nritems; 953ac8e9819SChris Mason int i; 954ac8e9819SChris Mason int slot; 955ac8e9819SChris Mason int found = 0; 956ac8e9819SChris Mason int ret = 0; 957ac8e9819SChris Mason 958ac8e9819SChris Mason leaf = path->nodes[0]; 959ac8e9819SChris Mason slot = path->slots[0]; 960ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 961ac8e9819SChris Mason 962ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 963ac8e9819SChris Mason i = nritems; 964ac8e9819SChris Mason goto advance_key; 965ac8e9819SChris Mason } 966ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 967ac8e9819SChris Mason 968ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 969ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 970ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 971ac8e9819SChris Mason 972ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 973ac8e9819SChris Mason item_len = 0; 974ac8e9819SChris Mason 975ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 976ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 977ac8e9819SChris Mason ret = 1; 978ac8e9819SChris Mason goto overflow; 979ac8e9819SChris Mason } 980ac8e9819SChris Mason 981ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 982ac8e9819SChris Mason if (!key_in_sk(key, sk)) 983ac8e9819SChris Mason continue; 984ac8e9819SChris Mason 985ac8e9819SChris Mason sh.objectid = key->objectid; 986ac8e9819SChris Mason sh.offset = key->offset; 987ac8e9819SChris Mason sh.type = key->type; 988ac8e9819SChris Mason sh.len = item_len; 989ac8e9819SChris Mason sh.transid = found_transid; 990ac8e9819SChris Mason 991ac8e9819SChris Mason /* copy search result header */ 992ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 993ac8e9819SChris Mason *sk_offset += sizeof(sh); 994ac8e9819SChris Mason 995ac8e9819SChris Mason if (item_len) { 996ac8e9819SChris Mason char *p = buf + *sk_offset; 997ac8e9819SChris Mason /* copy the item */ 998ac8e9819SChris Mason read_extent_buffer(leaf, p, 999ac8e9819SChris Mason item_off, item_len); 1000ac8e9819SChris Mason *sk_offset += item_len; 1001ac8e9819SChris Mason } 100290fdde14SChris Mason found++; 1003ac8e9819SChris Mason 1004ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1005ac8e9819SChris Mason break; 1006ac8e9819SChris Mason } 1007ac8e9819SChris Mason advance_key: 1008ac8e9819SChris Mason ret = 0; 1009abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1010abc6e134SChris Mason key->offset++; 1011abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1012abc6e134SChris Mason key->offset = 0; 1013abc6e134SChris Mason key->type++; 1014abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1015abc6e134SChris Mason key->offset = 0; 1016abc6e134SChris Mason key->type = 0; 1017abc6e134SChris Mason key->objectid++; 1018abc6e134SChris Mason } else 1019abc6e134SChris Mason ret = 1; 1020ac8e9819SChris Mason overflow: 1021ac8e9819SChris Mason *num_found += found; 1022ac8e9819SChris Mason return ret; 1023ac8e9819SChris Mason } 1024ac8e9819SChris Mason 1025ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1026ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1027ac8e9819SChris Mason { 1028ac8e9819SChris Mason struct btrfs_root *root; 1029ac8e9819SChris Mason struct btrfs_key key; 1030ac8e9819SChris Mason struct btrfs_key max_key; 1031ac8e9819SChris Mason struct btrfs_path *path; 1032ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1033ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1034ac8e9819SChris Mason int ret; 1035ac8e9819SChris Mason int num_found = 0; 1036ac8e9819SChris Mason unsigned long sk_offset = 0; 1037ac8e9819SChris Mason 1038ac8e9819SChris Mason path = btrfs_alloc_path(); 1039ac8e9819SChris Mason if (!path) 1040ac8e9819SChris Mason return -ENOMEM; 1041ac8e9819SChris Mason 1042ac8e9819SChris Mason if (sk->tree_id == 0) { 1043ac8e9819SChris Mason /* search the root of the inode that was passed */ 1044ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1045ac8e9819SChris Mason } else { 1046ac8e9819SChris Mason key.objectid = sk->tree_id; 1047ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1048ac8e9819SChris Mason key.offset = (u64)-1; 1049ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1050ac8e9819SChris Mason if (IS_ERR(root)) { 1051ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1052ac8e9819SChris Mason sk->tree_id); 1053ac8e9819SChris Mason btrfs_free_path(path); 1054ac8e9819SChris Mason return -ENOENT; 1055ac8e9819SChris Mason } 1056ac8e9819SChris Mason } 1057ac8e9819SChris Mason 1058ac8e9819SChris Mason key.objectid = sk->min_objectid; 1059ac8e9819SChris Mason key.type = sk->min_type; 1060ac8e9819SChris Mason key.offset = sk->min_offset; 1061ac8e9819SChris Mason 1062ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1063ac8e9819SChris Mason max_key.type = sk->max_type; 1064ac8e9819SChris Mason max_key.offset = sk->max_offset; 1065ac8e9819SChris Mason 1066ac8e9819SChris Mason path->keep_locks = 1; 1067ac8e9819SChris Mason 1068ac8e9819SChris Mason while(1) { 1069ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1070ac8e9819SChris Mason sk->min_transid); 1071ac8e9819SChris Mason if (ret != 0) { 1072ac8e9819SChris Mason if (ret > 0) 1073ac8e9819SChris Mason ret = 0; 1074ac8e9819SChris Mason goto err; 1075ac8e9819SChris Mason } 1076ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1077ac8e9819SChris Mason &sk_offset, &num_found); 1078ac8e9819SChris Mason btrfs_release_path(root, path); 1079ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1080ac8e9819SChris Mason break; 1081ac8e9819SChris Mason 1082ac8e9819SChris Mason } 1083ac8e9819SChris Mason ret = 0; 1084ac8e9819SChris Mason err: 1085ac8e9819SChris Mason sk->nr_items = num_found; 1086ac8e9819SChris Mason btrfs_free_path(path); 1087ac8e9819SChris Mason return ret; 1088ac8e9819SChris Mason } 1089ac8e9819SChris Mason 1090ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1091ac8e9819SChris Mason void __user *argp) 1092ac8e9819SChris Mason { 1093ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1094ac8e9819SChris Mason struct inode *inode; 1095ac8e9819SChris Mason int ret; 1096ac8e9819SChris Mason 1097ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1098ac8e9819SChris Mason return -EPERM; 1099ac8e9819SChris Mason 1100ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1101ac8e9819SChris Mason if (!args) 1102ac8e9819SChris Mason return -ENOMEM; 1103ac8e9819SChris Mason 1104ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1105ac8e9819SChris Mason kfree(args); 1106ac8e9819SChris Mason return -EFAULT; 1107ac8e9819SChris Mason } 1108ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1109ac8e9819SChris Mason ret = search_ioctl(inode, args); 1110ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1111ac8e9819SChris Mason ret = -EFAULT; 1112ac8e9819SChris Mason kfree(args); 1113ac8e9819SChris Mason return ret; 1114ac8e9819SChris Mason } 1115ac8e9819SChris Mason 111698d377a0STARUISI Hiroaki /* 1117ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1118ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 111998d377a0STARUISI Hiroaki */ 112098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 112198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 112298d377a0STARUISI Hiroaki { 112398d377a0STARUISI Hiroaki struct btrfs_root *root; 112498d377a0STARUISI Hiroaki struct btrfs_key key; 1125ac8e9819SChris Mason char *ptr; 112698d377a0STARUISI Hiroaki int ret = -1; 112798d377a0STARUISI Hiroaki int slot; 112898d377a0STARUISI Hiroaki int len; 112998d377a0STARUISI Hiroaki int total_len = 0; 113098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 113198d377a0STARUISI Hiroaki struct extent_buffer *l; 113298d377a0STARUISI Hiroaki struct btrfs_path *path; 113398d377a0STARUISI Hiroaki 113498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 113598d377a0STARUISI Hiroaki name[0]='\0'; 113698d377a0STARUISI Hiroaki return 0; 113798d377a0STARUISI Hiroaki } 113898d377a0STARUISI Hiroaki 113998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 114098d377a0STARUISI Hiroaki if (!path) 114198d377a0STARUISI Hiroaki return -ENOMEM; 114298d377a0STARUISI Hiroaki 1143ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 114498d377a0STARUISI Hiroaki 114598d377a0STARUISI Hiroaki key.objectid = tree_id; 114698d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 114798d377a0STARUISI Hiroaki key.offset = (u64)-1; 114898d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 114998d377a0STARUISI Hiroaki if (IS_ERR(root)) { 115098d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 11518ad6fcabSChris Mason ret = -ENOENT; 11528ad6fcabSChris Mason goto out; 115398d377a0STARUISI Hiroaki } 115498d377a0STARUISI Hiroaki 115598d377a0STARUISI Hiroaki key.objectid = dirid; 115698d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 11578ad6fcabSChris Mason key.offset = (u64)-1; 115898d377a0STARUISI Hiroaki 115998d377a0STARUISI Hiroaki while(1) { 116098d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 116198d377a0STARUISI Hiroaki if (ret < 0) 116298d377a0STARUISI Hiroaki goto out; 116398d377a0STARUISI Hiroaki 116498d377a0STARUISI Hiroaki l = path->nodes[0]; 116598d377a0STARUISI Hiroaki slot = path->slots[0]; 11668ad6fcabSChris Mason if (ret > 0 && slot > 0) 11678ad6fcabSChris Mason slot--; 116898d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 116998d377a0STARUISI Hiroaki 117098d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1171ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1172ac8e9819SChris Mason ret = -ENOENT; 117398d377a0STARUISI Hiroaki goto out; 1174ac8e9819SChris Mason } 117598d377a0STARUISI Hiroaki 117698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 117798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 117898d377a0STARUISI Hiroaki ptr -= len + 1; 117998d377a0STARUISI Hiroaki total_len += len + 1; 1180ac8e9819SChris Mason if (ptr < name) 118198d377a0STARUISI Hiroaki goto out; 118298d377a0STARUISI Hiroaki 118398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 118498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 118598d377a0STARUISI Hiroaki 118698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 118798d377a0STARUISI Hiroaki break; 118898d377a0STARUISI Hiroaki 118998d377a0STARUISI Hiroaki btrfs_release_path(root, path); 119098d377a0STARUISI Hiroaki key.objectid = key.offset; 11918ad6fcabSChris Mason key.offset = (u64)-1; 119298d377a0STARUISI Hiroaki dirid = key.objectid; 119398d377a0STARUISI Hiroaki 119498d377a0STARUISI Hiroaki } 1195ac8e9819SChris Mason if (ptr < name) 119698d377a0STARUISI Hiroaki goto out; 1197ac8e9819SChris Mason memcpy(name, ptr, total_len); 119898d377a0STARUISI Hiroaki name[total_len]='\0'; 119998d377a0STARUISI Hiroaki ret = 0; 120098d377a0STARUISI Hiroaki out: 120198d377a0STARUISI Hiroaki btrfs_free_path(path); 1202ac8e9819SChris Mason return ret; 1203ac8e9819SChris Mason } 1204ac8e9819SChris Mason 1205ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1206ac8e9819SChris Mason void __user *argp) 1207ac8e9819SChris Mason { 1208ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1209ac8e9819SChris Mason struct inode *inode; 1210ac8e9819SChris Mason int ret; 1211ac8e9819SChris Mason 1212ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1213ac8e9819SChris Mason return -EPERM; 1214ac8e9819SChris Mason 1215ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1216ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1217ac8e9819SChris Mason kfree(args); 1218ac8e9819SChris Mason return -EFAULT; 1219ac8e9819SChris Mason } 1220ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1221ac8e9819SChris Mason 12221b53ac4dSChris Mason if (args->treeid == 0) 12231b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 12241b53ac4dSChris Mason 1225ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1226ac8e9819SChris Mason args->treeid, args->objectid, 1227ac8e9819SChris Mason args->name); 1228ac8e9819SChris Mason 1229ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1230ac8e9819SChris Mason ret = -EFAULT; 1231ac8e9819SChris Mason 1232ac8e9819SChris Mason kfree(args); 123398d377a0STARUISI Hiroaki return ret; 123498d377a0STARUISI Hiroaki } 123598d377a0STARUISI Hiroaki 123676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 123776dda93cSYan, Zheng void __user *arg) 123876dda93cSYan, Zheng { 123976dda93cSYan, Zheng struct dentry *parent = fdentry(file); 124076dda93cSYan, Zheng struct dentry *dentry; 124176dda93cSYan, Zheng struct inode *dir = parent->d_inode; 124276dda93cSYan, Zheng struct inode *inode; 124376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 124476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 124576dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 124676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 124776dda93cSYan, Zheng int namelen; 124876dda93cSYan, Zheng int ret; 124976dda93cSYan, Zheng int err = 0; 125076dda93cSYan, Zheng 125176dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 125276dda93cSYan, Zheng return -EPERM; 125376dda93cSYan, Zheng 125476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 125576dda93cSYan, Zheng if (IS_ERR(vol_args)) 125676dda93cSYan, Zheng return PTR_ERR(vol_args); 125776dda93cSYan, Zheng 125876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 125976dda93cSYan, Zheng namelen = strlen(vol_args->name); 126076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 126176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 126276dda93cSYan, Zheng err = -EINVAL; 126376dda93cSYan, Zheng goto out; 126476dda93cSYan, Zheng } 126576dda93cSYan, Zheng 126676dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 126776dda93cSYan, Zheng if (err) 126876dda93cSYan, Zheng goto out; 126976dda93cSYan, Zheng 127076dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 127176dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 127276dda93cSYan, Zheng if (IS_ERR(dentry)) { 127376dda93cSYan, Zheng err = PTR_ERR(dentry); 127476dda93cSYan, Zheng goto out_unlock_dir; 127576dda93cSYan, Zheng } 127676dda93cSYan, Zheng 127776dda93cSYan, Zheng if (!dentry->d_inode) { 127876dda93cSYan, Zheng err = -ENOENT; 127976dda93cSYan, Zheng goto out_dput; 128076dda93cSYan, Zheng } 128176dda93cSYan, Zheng 128276dda93cSYan, Zheng inode = dentry->d_inode; 128376dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 128476dda93cSYan, Zheng err = -EINVAL; 128576dda93cSYan, Zheng goto out_dput; 128676dda93cSYan, Zheng } 128776dda93cSYan, Zheng 128876dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 128976dda93cSYan, Zheng 129076dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 129176dda93cSYan, Zheng err = d_invalidate(dentry); 129276dda93cSYan, Zheng if (err) 129376dda93cSYan, Zheng goto out_unlock; 129476dda93cSYan, Zheng 129576dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 129676dda93cSYan, Zheng 129776dda93cSYan, Zheng err = may_destroy_subvol(dest); 129876dda93cSYan, Zheng if (err) 129976dda93cSYan, Zheng goto out_up_write; 130076dda93cSYan, Zheng 130176dda93cSYan, Zheng trans = btrfs_start_transaction(root, 1); 130276dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 130376dda93cSYan, Zheng dest->root_key.objectid, 130476dda93cSYan, Zheng dentry->d_name.name, 130576dda93cSYan, Zheng dentry->d_name.len); 130676dda93cSYan, Zheng BUG_ON(ret); 130776dda93cSYan, Zheng 130876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 130976dda93cSYan, Zheng 131076dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 131176dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 131276dda93cSYan, Zheng dest->root_item.drop_level = 0; 131376dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 131476dda93cSYan, Zheng 131576dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 131676dda93cSYan, Zheng root->fs_info->tree_root, 131776dda93cSYan, Zheng dest->root_key.objectid); 131876dda93cSYan, Zheng BUG_ON(ret); 131976dda93cSYan, Zheng 132076dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 132176dda93cSYan, Zheng BUG_ON(ret); 132276dda93cSYan, Zheng inode->i_flags |= S_DEAD; 132376dda93cSYan, Zheng out_up_write: 132476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 132576dda93cSYan, Zheng out_unlock: 132676dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 132776dda93cSYan, Zheng if (!err) { 1328efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 132976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 133076dda93cSYan, Zheng d_delete(dentry); 133176dda93cSYan, Zheng } 133276dda93cSYan, Zheng out_dput: 133376dda93cSYan, Zheng dput(dentry); 133476dda93cSYan, Zheng out_unlock_dir: 133576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 133676dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 133776dda93cSYan, Zheng out: 133876dda93cSYan, Zheng kfree(vol_args); 133976dda93cSYan, Zheng return err; 134076dda93cSYan, Zheng } 134176dda93cSYan, Zheng 13421e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1343f46b5a66SChristoph Hellwig { 1344f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1345f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 13461e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1347c146afadSYan Zheng int ret; 1348c146afadSYan Zheng 1349c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1350c146afadSYan Zheng if (ret) 1351c146afadSYan Zheng return ret; 1352f46b5a66SChristoph Hellwig 1353f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1354f46b5a66SChristoph Hellwig case S_IFDIR: 1355e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1356e441d54dSChris Mason ret = -EPERM; 1357e441d54dSChris Mason goto out; 1358e441d54dSChris Mason } 1359f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 1360f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 1361f46b5a66SChristoph Hellwig break; 1362f46b5a66SChristoph Hellwig case S_IFREG: 1363e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1364e441d54dSChris Mason ret = -EINVAL; 1365e441d54dSChris Mason goto out; 1366e441d54dSChris Mason } 13671e701a32SChris Mason 13681e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 13691e701a32SChris Mason if (!range) { 13701e701a32SChris Mason ret = -ENOMEM; 13711e701a32SChris Mason goto out; 13721e701a32SChris Mason } 13731e701a32SChris Mason 13741e701a32SChris Mason if (argp) { 13751e701a32SChris Mason if (copy_from_user(range, argp, 13761e701a32SChris Mason sizeof(*range))) { 13771e701a32SChris Mason ret = -EFAULT; 13781e701a32SChris Mason kfree(range); 13791e701a32SChris Mason } 13801e701a32SChris Mason /* compression requires us to start the IO */ 13811e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13821e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 13831e701a32SChris Mason range->extent_thresh = (u32)-1; 13841e701a32SChris Mason } 13851e701a32SChris Mason } else { 13861e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 13871e701a32SChris Mason range->len = (u64)-1; 13881e701a32SChris Mason } 13891e701a32SChris Mason btrfs_defrag_file(file, range); 13901e701a32SChris Mason kfree(range); 1391f46b5a66SChristoph Hellwig break; 1392f46b5a66SChristoph Hellwig } 1393e441d54dSChris Mason out: 1394ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1395e441d54dSChris Mason return ret; 1396f46b5a66SChristoph Hellwig } 1397f46b5a66SChristoph Hellwig 1398b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1399f46b5a66SChristoph Hellwig { 1400f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1401f46b5a66SChristoph Hellwig int ret; 1402f46b5a66SChristoph Hellwig 1403e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1404e441d54dSChris Mason return -EPERM; 1405e441d54dSChris Mason 1406dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1407dae7b665SLi Zefan if (IS_ERR(vol_args)) 1408dae7b665SLi Zefan return PTR_ERR(vol_args); 1409f46b5a66SChristoph Hellwig 14105516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1411f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1412f46b5a66SChristoph Hellwig 1413f46b5a66SChristoph Hellwig kfree(vol_args); 1414f46b5a66SChristoph Hellwig return ret; 1415f46b5a66SChristoph Hellwig } 1416f46b5a66SChristoph Hellwig 1417b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1418f46b5a66SChristoph Hellwig { 1419f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1420f46b5a66SChristoph Hellwig int ret; 1421f46b5a66SChristoph Hellwig 1422e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1423e441d54dSChris Mason return -EPERM; 1424e441d54dSChris Mason 1425c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1426c146afadSYan Zheng return -EROFS; 1427c146afadSYan Zheng 1428dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1429dae7b665SLi Zefan if (IS_ERR(vol_args)) 1430dae7b665SLi Zefan return PTR_ERR(vol_args); 1431f46b5a66SChristoph Hellwig 14325516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1433f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1434f46b5a66SChristoph Hellwig 1435f46b5a66SChristoph Hellwig kfree(vol_args); 1436f46b5a66SChristoph Hellwig return ret; 1437f46b5a66SChristoph Hellwig } 1438f46b5a66SChristoph Hellwig 143976dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1440b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1441f46b5a66SChristoph Hellwig { 1442f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1443f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1444f46b5a66SChristoph Hellwig struct file *src_file; 1445f46b5a66SChristoph Hellwig struct inode *src; 1446f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1447f46b5a66SChristoph Hellwig struct btrfs_path *path; 1448f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1449ae01a0abSYan Zheng char *buf; 1450ae01a0abSYan Zheng struct btrfs_key key; 1451f46b5a66SChristoph Hellwig u32 nritems; 1452f46b5a66SChristoph Hellwig int slot; 1453ae01a0abSYan Zheng int ret; 1454c5c9cd4dSSage Weil u64 len = olen; 1455c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1456c5c9cd4dSSage Weil u64 hint_byte; 1457d20f7043SChris Mason 1458c5c9cd4dSSage Weil /* 1459c5c9cd4dSSage Weil * TODO: 1460c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1461c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1462c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1463c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1464c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1465c5c9cd4dSSage Weil * they don't overlap)? 1466c5c9cd4dSSage Weil */ 1467c5c9cd4dSSage Weil 1468e441d54dSChris Mason /* the destination must be opened for writing */ 1469e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 1470e441d54dSChris Mason return -EINVAL; 1471e441d54dSChris Mason 1472c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1473c146afadSYan Zheng if (ret) 1474c146afadSYan Zheng return ret; 1475c146afadSYan Zheng 1476c5c9cd4dSSage Weil src_file = fget(srcfd); 1477ab67b7c1SYan Zheng if (!src_file) { 1478ab67b7c1SYan Zheng ret = -EBADF; 1479ab67b7c1SYan Zheng goto out_drop_write; 1480ab67b7c1SYan Zheng } 1481f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1482f46b5a66SChristoph Hellwig 1483c5c9cd4dSSage Weil ret = -EINVAL; 1484c5c9cd4dSSage Weil if (src == inode) 1485c5c9cd4dSSage Weil goto out_fput; 1486c5c9cd4dSSage Weil 1487ae01a0abSYan Zheng ret = -EISDIR; 1488ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1489f46b5a66SChristoph Hellwig goto out_fput; 1490f46b5a66SChristoph Hellwig 1491ae01a0abSYan Zheng ret = -EXDEV; 1492ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1493ae01a0abSYan Zheng goto out_fput; 1494ae01a0abSYan Zheng 1495ae01a0abSYan Zheng ret = -ENOMEM; 1496ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1497ae01a0abSYan Zheng if (!buf) 1498ae01a0abSYan Zheng goto out_fput; 1499ae01a0abSYan Zheng 1500ae01a0abSYan Zheng path = btrfs_alloc_path(); 1501ae01a0abSYan Zheng if (!path) { 1502ae01a0abSYan Zheng vfree(buf); 1503ae01a0abSYan Zheng goto out_fput; 1504ae01a0abSYan Zheng } 1505ae01a0abSYan Zheng path->reada = 2; 1506ae01a0abSYan Zheng 1507f46b5a66SChristoph Hellwig if (inode < src) { 1508f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1509f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1510f46b5a66SChristoph Hellwig } else { 1511f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1512f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1513f46b5a66SChristoph Hellwig } 1514f46b5a66SChristoph Hellwig 1515c5c9cd4dSSage Weil /* determine range to clone */ 1516c5c9cd4dSSage Weil ret = -EINVAL; 1517c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 1518f46b5a66SChristoph Hellwig goto out_unlock; 1519c5c9cd4dSSage Weil if (len == 0) 1520c5c9cd4dSSage Weil olen = len = src->i_size - off; 1521c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1522c5c9cd4dSSage Weil if (off + len == src->i_size) 1523c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1524c5c9cd4dSSage Weil - off; 1525c5c9cd4dSSage Weil 1526c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1527c5c9cd4dSSage Weil if ((off & (bs-1)) || 1528c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1529c5c9cd4dSSage Weil goto out_unlock; 1530c5c9cd4dSSage Weil 1531f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1532f46b5a66SChristoph Hellwig another, and lock file content */ 1533f46b5a66SChristoph Hellwig while (1) { 153431840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1535c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1536c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1537ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1538f46b5a66SChristoph Hellwig break; 1539c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1540ae01a0abSYan Zheng if (ordered) 1541ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1542c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1543f46b5a66SChristoph Hellwig } 1544f46b5a66SChristoph Hellwig 1545ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 1546ae01a0abSYan Zheng BUG_ON(!trans); 1547ae01a0abSYan Zheng 1548c5c9cd4dSSage Weil /* punch hole in destination first */ 1549920bbbfbSYan, Zheng btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1); 1550c5c9cd4dSSage Weil 1551c5c9cd4dSSage Weil /* clone data */ 1552f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1553ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1554ae01a0abSYan Zheng key.offset = 0; 1555f46b5a66SChristoph Hellwig 1556f46b5a66SChristoph Hellwig while (1) { 1557f46b5a66SChristoph Hellwig /* 1558f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1559f46b5a66SChristoph Hellwig * tree. 1560f46b5a66SChristoph Hellwig */ 1561f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 1562f46b5a66SChristoph Hellwig if (ret < 0) 1563f46b5a66SChristoph Hellwig goto out; 1564f46b5a66SChristoph Hellwig 1565ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1566ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1567f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1568f46b5a66SChristoph Hellwig if (ret < 0) 1569f46b5a66SChristoph Hellwig goto out; 1570f46b5a66SChristoph Hellwig if (ret > 0) 1571f46b5a66SChristoph Hellwig break; 1572ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1573f46b5a66SChristoph Hellwig } 1574f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1575f46b5a66SChristoph Hellwig slot = path->slots[0]; 1576f46b5a66SChristoph Hellwig 1577ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1578d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1579f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1580f46b5a66SChristoph Hellwig break; 1581f46b5a66SChristoph Hellwig 1582c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1583c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1584c5c9cd4dSSage Weil int type; 158531840ae1SZheng Yan u32 size; 158631840ae1SZheng Yan struct btrfs_key new_key; 1587c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1588c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1589c5c9cd4dSSage Weil u8 comp; 159031840ae1SZheng Yan 159131840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 159231840ae1SZheng Yan read_extent_buffer(leaf, buf, 159331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 159431840ae1SZheng Yan size); 1595c5c9cd4dSSage Weil 1596c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1597c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1598c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1599c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1600c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1601c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1602d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1603d397712bSChris Mason extent); 1604d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1605d397712bSChris Mason extent); 1606c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1607d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1608d397712bSChris Mason extent); 1609c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1610c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1611c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1612c5c9cd4dSSage Weil extent); 1613c5c9cd4dSSage Weil } 161431840ae1SZheng Yan btrfs_release_path(root, path); 161531840ae1SZheng Yan 1616c5c9cd4dSSage Weil if (key.offset + datal < off || 1617c5c9cd4dSSage Weil key.offset >= off+len) 1618c5c9cd4dSSage Weil goto next; 1619c5c9cd4dSSage Weil 162031840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 162131840ae1SZheng Yan new_key.objectid = inode->i_ino; 1622c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1623c5c9cd4dSSage Weil 1624c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1625c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 162631840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 162731840ae1SZheng Yan &new_key, size); 162831840ae1SZheng Yan if (ret) 162931840ae1SZheng Yan goto out; 163031840ae1SZheng Yan 163131840ae1SZheng Yan leaf = path->nodes[0]; 163231840ae1SZheng Yan slot = path->slots[0]; 163331840ae1SZheng Yan write_extent_buffer(leaf, buf, 163431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 163531840ae1SZheng Yan size); 1636ae01a0abSYan Zheng 1637f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1638f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1639c5c9cd4dSSage Weil 1640c5c9cd4dSSage Weil if (off > key.offset) { 1641c5c9cd4dSSage Weil datao += off - key.offset; 1642c5c9cd4dSSage Weil datal -= off - key.offset; 1643c5c9cd4dSSage Weil } 1644ac6889cbSChris Mason 1645ac6889cbSChris Mason if (key.offset + datal > off + len) 1646ac6889cbSChris Mason datal = off + len - key.offset; 1647ac6889cbSChris Mason 1648c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1649c5c9cd4dSSage Weil if (!disko) 1650c5c9cd4dSSage Weil datao = 0; 1651c5c9cd4dSSage Weil 1652c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1653c5c9cd4dSSage Weil datao); 1654c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1655c5c9cd4dSSage Weil datal); 1656c5c9cd4dSSage Weil if (disko) { 1657c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1658ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 16595d4f98a2SYan Zheng disko, diskl, 0, 1660f46b5a66SChristoph Hellwig root->root_key.objectid, 16615d4f98a2SYan Zheng inode->i_ino, 16625d4f98a2SYan Zheng new_key.offset - datao); 1663ae01a0abSYan Zheng BUG_ON(ret); 1664f46b5a66SChristoph Hellwig } 1665c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1666c5c9cd4dSSage Weil u64 skip = 0; 1667c5c9cd4dSSage Weil u64 trim = 0; 1668c5c9cd4dSSage Weil if (off > key.offset) { 1669c5c9cd4dSSage Weil skip = off - key.offset; 1670c5c9cd4dSSage Weil new_key.offset += skip; 167131840ae1SZheng Yan } 1672d397712bSChris Mason 1673c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1674c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1675d397712bSChris Mason 1676c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1677c5c9cd4dSSage Weil ret = -EINVAL; 1678c5c9cd4dSSage Weil goto out; 167931840ae1SZheng Yan } 1680c5c9cd4dSSage Weil size -= skip + trim; 1681c5c9cd4dSSage Weil datal -= skip + trim; 1682c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1683c5c9cd4dSSage Weil &new_key, size); 1684c5c9cd4dSSage Weil if (ret) 1685c5c9cd4dSSage Weil goto out; 1686c5c9cd4dSSage Weil 1687c5c9cd4dSSage Weil if (skip) { 1688d397712bSChris Mason u32 start = 1689d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1690c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1691c5c9cd4dSSage Weil datal); 1692c5c9cd4dSSage Weil } 1693c5c9cd4dSSage Weil 1694c5c9cd4dSSage Weil leaf = path->nodes[0]; 1695c5c9cd4dSSage Weil slot = path->slots[0]; 1696c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1697c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1698c5c9cd4dSSage Weil size); 1699c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1700c5c9cd4dSSage Weil } 1701c5c9cd4dSSage Weil 1702c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1703c5c9cd4dSSage Weil } 1704c5c9cd4dSSage Weil 1705c5c9cd4dSSage Weil next: 170631840ae1SZheng Yan btrfs_release_path(root, path); 1707ae01a0abSYan Zheng key.offset++; 1708ae01a0abSYan Zheng } 1709f46b5a66SChristoph Hellwig ret = 0; 1710f46b5a66SChristoph Hellwig out: 1711ae01a0abSYan Zheng btrfs_release_path(root, path); 1712ae01a0abSYan Zheng if (ret == 0) { 1713ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1714c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1715c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1716ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1717ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1718ae01a0abSYan Zheng } 1719f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1720c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1721ae01a0abSYan Zheng if (ret) 1722ae01a0abSYan Zheng vmtruncate(inode, 0); 1723f46b5a66SChristoph Hellwig out_unlock: 1724f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1725f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1726ae01a0abSYan Zheng vfree(buf); 1727ae01a0abSYan Zheng btrfs_free_path(path); 1728f46b5a66SChristoph Hellwig out_fput: 1729f46b5a66SChristoph Hellwig fput(src_file); 1730ab67b7c1SYan Zheng out_drop_write: 1731ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1732f46b5a66SChristoph Hellwig return ret; 1733f46b5a66SChristoph Hellwig } 1734f46b5a66SChristoph Hellwig 17357a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1736c5c9cd4dSSage Weil { 1737c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1738c5c9cd4dSSage Weil 17397a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1740c5c9cd4dSSage Weil return -EFAULT; 1741c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1742c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1743c5c9cd4dSSage Weil } 1744c5c9cd4dSSage Weil 1745f46b5a66SChristoph Hellwig /* 1746f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1747f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1748f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1749f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1750f46b5a66SChristoph Hellwig */ 1751b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1752f46b5a66SChristoph Hellwig { 1753f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1754f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1755f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 17561ab86aedSSage Weil int ret; 1757f46b5a66SChristoph Hellwig 17581ab86aedSSage Weil ret = -EPERM; 1759df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1760f46b5a66SChristoph Hellwig goto out; 17611ab86aedSSage Weil 17621ab86aedSSage Weil ret = -EINPROGRESS; 17631ab86aedSSage Weil if (file->private_data) 17641ab86aedSSage Weil goto out; 17659ca9ee09SSage Weil 1766c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1767c146afadSYan Zheng if (ret) 1768c146afadSYan Zheng goto out; 1769c146afadSYan Zheng 17709ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 17719ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 17729ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17739ca9ee09SSage Weil 1774f46b5a66SChristoph Hellwig ret = -ENOMEM; 17751ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 17761ab86aedSSage Weil if (!trans) 17771ab86aedSSage Weil goto out_drop; 17781ab86aedSSage Weil 17791ab86aedSSage Weil file->private_data = trans; 17801ab86aedSSage Weil return 0; 17811ab86aedSSage Weil 17821ab86aedSSage Weil out_drop: 17831ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 17841ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 17851ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17861ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1787f46b5a66SChristoph Hellwig out: 1788f46b5a66SChristoph Hellwig return ret; 1789f46b5a66SChristoph Hellwig } 1790f46b5a66SChristoph Hellwig 17916ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 17926ef5ed0dSJosef Bacik { 17936ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 17946ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 17956ef5ed0dSJosef Bacik struct btrfs_root *new_root; 17966ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 17976ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 17986ef5ed0dSJosef Bacik struct btrfs_path *path; 17996ef5ed0dSJosef Bacik struct btrfs_key location; 18006ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 18016ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 18026ef5ed0dSJosef Bacik u64 features; 18036ef5ed0dSJosef Bacik u64 objectid = 0; 18046ef5ed0dSJosef Bacik u64 dir_id; 18056ef5ed0dSJosef Bacik 18066ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 18076ef5ed0dSJosef Bacik return -EPERM; 18086ef5ed0dSJosef Bacik 18096ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 18106ef5ed0dSJosef Bacik return -EFAULT; 18116ef5ed0dSJosef Bacik 18126ef5ed0dSJosef Bacik if (!objectid) 18136ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 18146ef5ed0dSJosef Bacik 18156ef5ed0dSJosef Bacik location.objectid = objectid; 18166ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 18176ef5ed0dSJosef Bacik location.offset = (u64)-1; 18186ef5ed0dSJosef Bacik 18196ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 18206ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 18216ef5ed0dSJosef Bacik return PTR_ERR(new_root); 18226ef5ed0dSJosef Bacik 18236ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 18246ef5ed0dSJosef Bacik return -ENOENT; 18256ef5ed0dSJosef Bacik 18266ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 18276ef5ed0dSJosef Bacik if (!path) 18286ef5ed0dSJosef Bacik return -ENOMEM; 18296ef5ed0dSJosef Bacik path->leave_spinning = 1; 18306ef5ed0dSJosef Bacik 18316ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 18326ef5ed0dSJosef Bacik if (!trans) { 18336ef5ed0dSJosef Bacik btrfs_free_path(path); 18346ef5ed0dSJosef Bacik return -ENOMEM; 18356ef5ed0dSJosef Bacik } 18366ef5ed0dSJosef Bacik 18376ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 18386ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 18396ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 18406ef5ed0dSJosef Bacik if (!di) { 18416ef5ed0dSJosef Bacik btrfs_free_path(path); 18426ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18436ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 18446ef5ed0dSJosef Bacik "this isn't going to work\n"); 18456ef5ed0dSJosef Bacik return -ENOENT; 18466ef5ed0dSJosef Bacik } 18476ef5ed0dSJosef Bacik 18486ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 18496ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 18506ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 18516ef5ed0dSJosef Bacik btrfs_free_path(path); 18526ef5ed0dSJosef Bacik 18536ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 18546ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 18556ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 18566ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 18576ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 18586ef5ed0dSJosef Bacik } 18596ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18606ef5ed0dSJosef Bacik 18616ef5ed0dSJosef Bacik return 0; 18626ef5ed0dSJosef Bacik } 18636ef5ed0dSJosef Bacik 18641406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 18651406e432SJosef Bacik { 18661406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 18671406e432SJosef Bacik struct btrfs_ioctl_space_info space; 18681406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 18697fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 18707fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 18711406e432SJosef Bacik struct btrfs_space_info *info; 18727fde62bfSChris Mason int alloc_size; 18731406e432SJosef Bacik int ret = 0; 18747fde62bfSChris Mason int slot_count = 0; 18751406e432SJosef Bacik 18761406e432SJosef Bacik if (copy_from_user(&space_args, 18771406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 18781406e432SJosef Bacik sizeof(space_args))) 18791406e432SJosef Bacik return -EFAULT; 18801406e432SJosef Bacik 18817fde62bfSChris Mason /* first we count slots */ 18827fde62bfSChris Mason rcu_read_lock(); 18837fde62bfSChris Mason list_for_each_entry_rcu(info, &root->fs_info->space_info, list) 18847fde62bfSChris Mason slot_count++; 18857fde62bfSChris Mason rcu_read_unlock(); 18861406e432SJosef Bacik 18877fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 18887fde62bfSChris Mason if (space_args.space_slots == 0) { 18897fde62bfSChris Mason space_args.total_spaces = slot_count; 18907fde62bfSChris Mason goto out; 18917fde62bfSChris Mason } 18927fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 18937fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 18947fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 18957fde62bfSChris Mason */ 18967fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 18977fde62bfSChris Mason return -ENOMEM; 18987fde62bfSChris Mason 18997fde62bfSChris Mason space_args.total_spaces = 0; 19007fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 19017fde62bfSChris Mason if (!dest) 19027fde62bfSChris Mason return -ENOMEM; 19037fde62bfSChris Mason dest_orig = dest; 19047fde62bfSChris Mason 19057fde62bfSChris Mason /* now we have a buffer to copy into */ 19061406e432SJosef Bacik rcu_read_lock(); 19071406e432SJosef Bacik list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { 19087fde62bfSChris Mason /* make sure we don't copy more than we allocated 19097fde62bfSChris Mason * in our buffer 19107fde62bfSChris Mason */ 19117fde62bfSChris Mason if (slot_count == 0) 19127fde62bfSChris Mason break; 19137fde62bfSChris Mason slot_count--; 19147fde62bfSChris Mason 19157fde62bfSChris Mason /* make sure userland has enough room in their buffer */ 19161406e432SJosef Bacik if (space_args.total_spaces >= space_args.space_slots) 19171406e432SJosef Bacik break; 19187fde62bfSChris Mason 19191406e432SJosef Bacik space.flags = info->flags; 19201406e432SJosef Bacik space.total_bytes = info->total_bytes; 19211406e432SJosef Bacik space.used_bytes = info->bytes_used; 19227fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 19231406e432SJosef Bacik dest++; 19241406e432SJosef Bacik space_args.total_spaces++; 19251406e432SJosef Bacik } 19261406e432SJosef Bacik rcu_read_unlock(); 19271406e432SJosef Bacik 19287fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 19297fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 19307fde62bfSChris Mason 19317fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 19327fde62bfSChris Mason ret = -EFAULT; 19337fde62bfSChris Mason 19347fde62bfSChris Mason kfree(dest_orig); 19357fde62bfSChris Mason out: 19367fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 19371406e432SJosef Bacik ret = -EFAULT; 19381406e432SJosef Bacik 19391406e432SJosef Bacik return ret; 19401406e432SJosef Bacik } 19411406e432SJosef Bacik 1942f46b5a66SChristoph Hellwig /* 1943f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1944f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1945f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1946f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1947f46b5a66SChristoph Hellwig */ 1948f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1949f46b5a66SChristoph Hellwig { 1950f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1951f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1952f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1953f46b5a66SChristoph Hellwig 1954f46b5a66SChristoph Hellwig trans = file->private_data; 19551ab86aedSSage Weil if (!trans) 19561ab86aedSSage Weil return -EINVAL; 1957b214107eSChristoph Hellwig file->private_data = NULL; 19589ca9ee09SSage Weil 19591ab86aedSSage Weil btrfs_end_transaction(trans, root); 19601ab86aedSSage Weil 19619ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19629ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 19639ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19649ca9ee09SSage Weil 1965cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 19661ab86aedSSage Weil return 0; 1967f46b5a66SChristoph Hellwig } 1968f46b5a66SChristoph Hellwig 1969f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1970f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1971f46b5a66SChristoph Hellwig { 1972f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 19734bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1974f46b5a66SChristoph Hellwig 1975f46b5a66SChristoph Hellwig switch (cmd) { 19766cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 19776cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 19786cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 19796cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 19806cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 19816cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1982f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 19834bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 19843de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 19854bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 198676dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 198776dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 19886ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 19896ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 1990f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 19911e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 19921e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 19931e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 1994f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 19954bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1996f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 19974bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1998f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 19994bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2000f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2001f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2002f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2003c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2004c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 20057a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2006f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2007f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2008f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2009f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2010ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2011ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2012ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2013ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 20141406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 20151406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2016f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2017f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2018f46b5a66SChristoph Hellwig return 0; 2019f46b5a66SChristoph Hellwig } 2020f46b5a66SChristoph Hellwig 2021f46b5a66SChristoph Hellwig return -ENOTTY; 2022f46b5a66SChristoph Hellwig } 2023