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> 425a0e3ad6STejun 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" 52f46b5a66SChristoph Hellwig 536cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 546cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 556cbff00fSChristoph Hellwig { 566cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 576cbff00fSChristoph Hellwig return flags; 586cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 596cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 606cbff00fSChristoph Hellwig else 616cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 626cbff00fSChristoph Hellwig } 63f46b5a66SChristoph Hellwig 646cbff00fSChristoph Hellwig /* 656cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 666cbff00fSChristoph Hellwig */ 676cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 686cbff00fSChristoph Hellwig { 696cbff00fSChristoph Hellwig unsigned int iflags = 0; 706cbff00fSChristoph Hellwig 716cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 726cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 736cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 746cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 756cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 766cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 786cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 806cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 826cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 836cbff00fSChristoph Hellwig 846cbff00fSChristoph Hellwig return iflags; 856cbff00fSChristoph Hellwig } 866cbff00fSChristoph Hellwig 876cbff00fSChristoph Hellwig /* 886cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 896cbff00fSChristoph Hellwig */ 906cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 916cbff00fSChristoph Hellwig { 926cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 936cbff00fSChristoph Hellwig 946cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 956cbff00fSChristoph Hellwig 966cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 976cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 986cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 996cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1006cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1016cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1026cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1036cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1046cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1056cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1066cbff00fSChristoph Hellwig } 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig /* 1096cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1106cbff00fSChristoph Hellwig * 1116cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1126cbff00fSChristoph Hellwig */ 1136cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1146cbff00fSChristoph Hellwig { 1150b4dcea5SChris Mason unsigned int flags; 1160b4dcea5SChris Mason 1170b4dcea5SChris Mason if (!dir) 1180b4dcea5SChris Mason return; 1190b4dcea5SChris Mason 1200b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1236cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1246cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1256cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1266cbff00fSChristoph Hellwig 1276cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1286cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1296cbff00fSChristoph Hellwig } 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1326cbff00fSChristoph Hellwig { 1336cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1346cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1376cbff00fSChristoph Hellwig return -EFAULT; 1386cbff00fSChristoph Hellwig return 0; 1396cbff00fSChristoph Hellwig } 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1426cbff00fSChristoph Hellwig { 1436cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1446cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1456cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1466cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1476cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1486cbff00fSChristoph Hellwig int ret; 1496cbff00fSChristoph Hellwig 1506cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1516cbff00fSChristoph Hellwig return -EFAULT; 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1546cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1556cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1566cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1596cbff00fSChristoph Hellwig return -EACCES; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1646cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1656cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1666cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1676cbff00fSChristoph Hellwig ret = -EPERM; 1686cbff00fSChristoph Hellwig goto out_unlock; 1696cbff00fSChristoph Hellwig } 1706cbff00fSChristoph Hellwig } 1716cbff00fSChristoph Hellwig 1726cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1736cbff00fSChristoph Hellwig if (ret) 1746cbff00fSChristoph Hellwig goto out_unlock; 1756cbff00fSChristoph Hellwig 1766cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1776cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1786cbff00fSChristoph Hellwig else 1796cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1806cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1816cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1826cbff00fSChristoph Hellwig else 1836cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1846cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1856cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1866cbff00fSChristoph Hellwig else 1876cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1886cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1896cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1906cbff00fSChristoph Hellwig else 1916cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1926cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1936cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1946cbff00fSChristoph Hellwig else 1956cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1966cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1976cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1986cbff00fSChristoph Hellwig else 1996cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2006cbff00fSChristoph Hellwig 2016cbff00fSChristoph Hellwig 2026cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2036cbff00fSChristoph Hellwig BUG_ON(!trans); 2046cbff00fSChristoph Hellwig 2056cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2066cbff00fSChristoph Hellwig BUG_ON(ret); 2076cbff00fSChristoph Hellwig 2086cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2096cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2106cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2116cbff00fSChristoph Hellwig 2126cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2136cbff00fSChristoph Hellwig out_unlock: 2146cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2156cbff00fSChristoph Hellwig return 0; 2166cbff00fSChristoph Hellwig } 2176cbff00fSChristoph Hellwig 2186cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2196cbff00fSChristoph Hellwig { 2206cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2236cbff00fSChristoph Hellwig } 224f46b5a66SChristoph Hellwig 225cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 226cb8e7090SChristoph Hellwig struct dentry *dentry, 227*72fd032eSSage Weil char *name, int namelen, 228*72fd032eSSage Weil u64 *async_transid) 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 243a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 244a22285a6SYan, Zheng 0, &objectid); 245a22285a6SYan, Zheng if (ret) 246a22285a6SYan, Zheng return ret; 2479ed74f2dSJosef Bacik /* 2489ed74f2dSJosef Bacik * 1 - inode item 2499ed74f2dSJosef Bacik * 2 - refs 2509ed74f2dSJosef Bacik * 1 - root item 2519ed74f2dSJosef Bacik * 2 - dir items 2529ed74f2dSJosef Bacik */ 253a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 254a22285a6SYan, Zheng if (IS_ERR(trans)) 255a22285a6SYan, Zheng return PTR_ERR(trans); 256f46b5a66SChristoph Hellwig 2575d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2585d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2598e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2608e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2618e8a1e31SJosef Bacik goto fail; 2628e8a1e31SJosef Bacik } 263f46b5a66SChristoph Hellwig 2645d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 265f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 266f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2675d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 268f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 269f46b5a66SChristoph Hellwig 270f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 271f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 272f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2735d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2745d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2755d4f98a2SYan Zheng BTRFS_UUID_SIZE); 276f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 277f46b5a66SChristoph Hellwig 278f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 279f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 280f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 281f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 282f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 283a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 284f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 285f46b5a66SChristoph Hellwig 286f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28784234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 288f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 289f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29086b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29180ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 292f46b5a66SChristoph Hellwig 293f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 294f46b5a66SChristoph Hellwig root_item.drop_level = 0; 295f46b5a66SChristoph Hellwig 296925baeddSChris Mason btrfs_tree_unlock(leaf); 297f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 298f46b5a66SChristoph Hellwig leaf = NULL; 299f46b5a66SChristoph Hellwig 300f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 301f46b5a66SChristoph Hellwig 302f46b5a66SChristoph Hellwig key.objectid = objectid; 3035d4f98a2SYan Zheng key.offset = 0; 304f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 305f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 306f46b5a66SChristoph Hellwig &root_item); 307f46b5a66SChristoph Hellwig if (ret) 308f46b5a66SChristoph Hellwig goto fail; 309f46b5a66SChristoph Hellwig 31076dda93cSYan, Zheng key.offset = (u64)-1; 31176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31276dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31376dda93cSYan, Zheng 31476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31576dda93cSYan, Zheng 31676dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 31776dda93cSYan, Zheng BTRFS_I(dir)->block_group); 318f46b5a66SChristoph Hellwig /* 319f46b5a66SChristoph Hellwig * insert the directory item 320f46b5a66SChristoph Hellwig */ 3213de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3223de4586cSChris Mason BUG_ON(ret); 3233de4586cSChris Mason 3243de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 325f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3263de4586cSChris Mason BTRFS_FT_DIR, index); 327f46b5a66SChristoph Hellwig if (ret) 328f46b5a66SChristoph Hellwig goto fail; 3290660b5afSChris Mason 33052c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33252c26179SYan Zheng BUG_ON(ret); 33352c26179SYan Zheng 3340660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3354df27c4dSYan, Zheng objectid, root->root_key.objectid, 3360660b5afSChris Mason dir->i_ino, index, name, namelen); 33776dda93cSYan, Zheng 3380660b5afSChris Mason BUG_ON(ret); 3390660b5afSChris Mason 34076dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 341f46b5a66SChristoph Hellwig fail: 342*72fd032eSSage Weil if (async_transid) { 343*72fd032eSSage Weil *async_transid = trans->transid; 344*72fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 345*72fd032eSSage Weil } else { 34676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 347*72fd032eSSage Weil } 348f46b5a66SChristoph Hellwig if (err && !ret) 349f46b5a66SChristoph Hellwig ret = err; 350f46b5a66SChristoph Hellwig return ret; 351f46b5a66SChristoph Hellwig } 352f46b5a66SChristoph Hellwig 353*72fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 354*72fd032eSSage Weil char *name, int namelen, u64 *async_transid) 355f46b5a66SChristoph Hellwig { 3562e4bfab9SYan, Zheng struct inode *inode; 357f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 358f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3592e4bfab9SYan, Zheng int ret; 360f46b5a66SChristoph Hellwig 361f46b5a66SChristoph Hellwig if (!root->ref_cows) 362f46b5a66SChristoph Hellwig return -EINVAL; 363f46b5a66SChristoph Hellwig 364a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 365a22285a6SYan, Zheng if (!pending_snapshot) 366a22285a6SYan, Zheng return -ENOMEM; 367a22285a6SYan, Zheng 368a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 369a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 370a22285a6SYan, Zheng pending_snapshot->root = root; 371a22285a6SYan, Zheng 372a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 373a22285a6SYan, Zheng if (IS_ERR(trans)) { 374a22285a6SYan, Zheng ret = PTR_ERR(trans); 375a22285a6SYan, Zheng goto fail; 376a22285a6SYan, Zheng } 377a22285a6SYan, Zheng 378a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 379a22285a6SYan, Zheng BUG_ON(ret); 380a22285a6SYan, Zheng 381a22285a6SYan, Zheng list_add(&pending_snapshot->list, 382a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 383*72fd032eSSage Weil if (async_transid) { 384*72fd032eSSage Weil *async_transid = trans->transid; 385*72fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 386*72fd032eSSage Weil root->fs_info->extent_root, 1); 387*72fd032eSSage Weil } else { 388*72fd032eSSage Weil ret = btrfs_commit_transaction(trans, 389*72fd032eSSage Weil root->fs_info->extent_root); 390*72fd032eSSage Weil } 391a22285a6SYan, Zheng BUG_ON(ret); 392a22285a6SYan, Zheng 393a22285a6SYan, Zheng ret = pending_snapshot->error; 394f46b5a66SChristoph Hellwig if (ret) 3952e4bfab9SYan, Zheng goto fail; 396f46b5a66SChristoph Hellwig 397a22285a6SYan, Zheng btrfs_orphan_cleanup(pending_snapshot->snap); 398f46b5a66SChristoph Hellwig 3992e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 4002e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4012e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4022e4bfab9SYan, Zheng goto fail; 4032e4bfab9SYan, Zheng } 4042e4bfab9SYan, Zheng BUG_ON(!inode); 4052e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4062e4bfab9SYan, Zheng ret = 0; 4072e4bfab9SYan, Zheng fail: 408a22285a6SYan, Zheng kfree(pending_snapshot); 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, 429*72fd032eSSage Weil struct btrfs_root *snap_src, 430*72fd032eSSage Weil u64 *async_transid) 431cb8e7090SChristoph Hellwig { 43276dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 433cb8e7090SChristoph Hellwig struct dentry *dentry; 434cb8e7090SChristoph Hellwig int error; 435cb8e7090SChristoph Hellwig 43676dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 437cb8e7090SChristoph Hellwig 438cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 439cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 440cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 441cb8e7090SChristoph Hellwig goto out_unlock; 442cb8e7090SChristoph Hellwig 443cb8e7090SChristoph Hellwig error = -EEXIST; 444cb8e7090SChristoph Hellwig if (dentry->d_inode) 445cb8e7090SChristoph Hellwig goto out_dput; 446cb8e7090SChristoph Hellwig 447cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 448cb8e7090SChristoph Hellwig if (error) 449cb8e7090SChristoph Hellwig goto out_dput; 450cb8e7090SChristoph Hellwig 45176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 452cb8e7090SChristoph Hellwig if (error) 453cb8e7090SChristoph Hellwig goto out_drop_write; 454cb8e7090SChristoph Hellwig 45576dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 45676dda93cSYan, Zheng 45776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 45876dda93cSYan, Zheng goto out_up_read; 45976dda93cSYan, Zheng 4603de4586cSChris Mason if (snap_src) { 461*72fd032eSSage Weil error = create_snapshot(snap_src, dentry, 462*72fd032eSSage Weil name, namelen, async_transid); 4633de4586cSChris Mason } else { 46476dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 465*72fd032eSSage Weil name, namelen, async_transid); 4663de4586cSChris Mason } 46776dda93cSYan, Zheng if (!error) 46876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 46976dda93cSYan, Zheng out_up_read: 47076dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 471cb8e7090SChristoph Hellwig out_drop_write: 472cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 473cb8e7090SChristoph Hellwig out_dput: 474cb8e7090SChristoph Hellwig dput(dentry); 475cb8e7090SChristoph Hellwig out_unlock: 47676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 477cb8e7090SChristoph Hellwig return error; 478cb8e7090SChristoph Hellwig } 479cb8e7090SChristoph Hellwig 480940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 4811e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 4821e701a32SChris Mason u64 *defrag_end) 483940100a4SChris Mason { 484940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 485940100a4SChris Mason struct extent_map *em = NULL; 486940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 487940100a4SChris Mason int ret = 1; 488940100a4SChris Mason 4891e701a32SChris Mason 4901e701a32SChris Mason if (thresh == 0) 4911e701a32SChris Mason thresh = 256 * 1024; 4921e701a32SChris Mason 493940100a4SChris Mason /* 494940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 495940100a4SChris Mason * defragging it 496940100a4SChris Mason */ 497940100a4SChris Mason if (start < *defrag_end) 498940100a4SChris Mason return 1; 499940100a4SChris Mason 500940100a4SChris Mason *skip = 0; 501940100a4SChris Mason 502940100a4SChris Mason /* 503940100a4SChris Mason * hopefully we have this extent in the tree already, try without 504940100a4SChris Mason * the full extent lock 505940100a4SChris Mason */ 506940100a4SChris Mason read_lock(&em_tree->lock); 507940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 508940100a4SChris Mason read_unlock(&em_tree->lock); 509940100a4SChris Mason 510940100a4SChris Mason if (!em) { 511940100a4SChris Mason /* get the big lock and read metadata off disk */ 512940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 513940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 514940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 515940100a4SChris Mason 5166cf8bfbfSDan Carpenter if (IS_ERR(em)) 517940100a4SChris Mason return 0; 518940100a4SChris Mason } 519940100a4SChris Mason 520940100a4SChris Mason /* this will cover holes, and inline extents */ 521940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 522940100a4SChris Mason ret = 0; 523940100a4SChris Mason 524940100a4SChris Mason /* 525940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 526940100a4SChris Mason */ 5271e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 528940100a4SChris Mason ret = 0; 529940100a4SChris Mason 530940100a4SChris Mason /* 531940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 532940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 533940100a4SChris Mason * so that the next tiny extent will force a defrag. 534940100a4SChris Mason * 535940100a4SChris Mason * The end result of this is that tiny extents before a single big 536940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 537940100a4SChris Mason */ 538940100a4SChris Mason if (ret) { 539940100a4SChris Mason *last_len += len; 540940100a4SChris Mason *defrag_end = extent_map_end(em); 541940100a4SChris Mason } else { 542940100a4SChris Mason *last_len = 0; 543940100a4SChris Mason *skip = extent_map_end(em); 544940100a4SChris Mason *defrag_end = 0; 545940100a4SChris Mason } 546940100a4SChris Mason 547940100a4SChris Mason free_extent_map(em); 548940100a4SChris Mason return ret; 549940100a4SChris Mason } 550940100a4SChris Mason 5511e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 5521e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 553f46b5a66SChristoph Hellwig { 554f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 555f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 556f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5573eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 558f46b5a66SChristoph Hellwig struct page *page; 559f46b5a66SChristoph Hellwig unsigned long last_index; 560f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 561f46b5a66SChristoph Hellwig unsigned long total_read = 0; 562f46b5a66SChristoph Hellwig u64 page_start; 563f46b5a66SChristoph Hellwig u64 page_end; 564940100a4SChris Mason u64 last_len = 0; 565940100a4SChris Mason u64 skip = 0; 566940100a4SChris Mason u64 defrag_end = 0; 567f46b5a66SChristoph Hellwig unsigned long i; 568f46b5a66SChristoph Hellwig int ret; 569f46b5a66SChristoph Hellwig 570940100a4SChris Mason if (inode->i_size == 0) 571940100a4SChris Mason return 0; 572f46b5a66SChristoph Hellwig 5731e701a32SChris Mason if (range->start + range->len > range->start) { 5741e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 5751e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 5761e701a32SChris Mason } else { 577940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 5781e701a32SChris Mason } 5791e701a32SChris Mason 5801e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 581940100a4SChris Mason while (i <= last_index) { 582940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 5831e701a32SChris Mason PAGE_CACHE_SIZE, 5841e701a32SChris Mason range->extent_thresh, 5851e701a32SChris Mason &last_len, &skip, 586940100a4SChris Mason &defrag_end)) { 587940100a4SChris Mason unsigned long next; 588940100a4SChris Mason /* 589940100a4SChris Mason * the should_defrag function tells us how much to skip 590940100a4SChris Mason * bump our counter by the suggested amount 591940100a4SChris Mason */ 592940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 593940100a4SChris Mason i = max(i + 1, next); 594940100a4SChris Mason continue; 595940100a4SChris Mason } 596940100a4SChris Mason 597f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 598f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 599f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 600f46b5a66SChristoph Hellwig } 601f46b5a66SChristoph Hellwig total_read++; 602940100a4SChris Mason mutex_lock(&inode->i_mutex); 6031e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6041e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 605940100a4SChris Mason 6060ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 6070ca1f7ceSYan, Zheng if (ret) 6080ca1f7ceSYan, Zheng goto err_unlock; 6093eaa2885SChris Mason again: 610940100a4SChris Mason if (inode->i_size == 0 || 611940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 612940100a4SChris Mason ret = 0; 613940100a4SChris Mason goto err_reservations; 614940100a4SChris Mason } 615940100a4SChris Mason 616f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 6170ca1f7ceSYan, Zheng if (!page) { 6180ca1f7ceSYan, Zheng ret = -ENOMEM; 619940100a4SChris Mason goto err_reservations; 6200ca1f7ceSYan, Zheng } 621940100a4SChris Mason 622f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 623f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 624f46b5a66SChristoph Hellwig lock_page(page); 625f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 626f46b5a66SChristoph Hellwig unlock_page(page); 627f46b5a66SChristoph Hellwig page_cache_release(page); 6280ca1f7ceSYan, Zheng ret = -EIO; 629940100a4SChris Mason goto err_reservations; 630f46b5a66SChristoph Hellwig } 631f46b5a66SChristoph Hellwig } 632f46b5a66SChristoph Hellwig 633940100a4SChris Mason if (page->mapping != inode->i_mapping) { 634940100a4SChris Mason unlock_page(page); 635940100a4SChris Mason page_cache_release(page); 636940100a4SChris Mason goto again; 637940100a4SChris Mason } 638940100a4SChris Mason 639f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 640f46b5a66SChristoph Hellwig 641940100a4SChris Mason if (PageDirty(page)) { 6420ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 643940100a4SChris Mason goto loop_unlock; 644940100a4SChris Mason } 645940100a4SChris Mason 646f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 647f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 648f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 6493eaa2885SChris Mason 6503eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 6513eaa2885SChris Mason if (ordered) { 6523eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 6533eaa2885SChris Mason unlock_page(page); 6543eaa2885SChris Mason page_cache_release(page); 6553eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 6563eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 6573eaa2885SChris Mason goto again; 6583eaa2885SChris Mason } 6593eaa2885SChris Mason set_page_extent_mapped(page); 6603eaa2885SChris Mason 661f87f057bSChris Mason /* 662f87f057bSChris Mason * this makes sure page_mkwrite is called on the 663f87f057bSChris Mason * page if it is dirtied again later 664f87f057bSChris Mason */ 665f87f057bSChris Mason clear_page_dirty_for_io(page); 666940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 667940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 668940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 669f87f057bSChris Mason 6702ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 671940100a4SChris Mason ClearPageChecked(page); 672f46b5a66SChristoph Hellwig set_page_dirty(page); 673a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 674940100a4SChris Mason 675940100a4SChris Mason loop_unlock: 676f46b5a66SChristoph Hellwig unlock_page(page); 677f46b5a66SChristoph Hellwig page_cache_release(page); 678940100a4SChris Mason mutex_unlock(&inode->i_mutex); 679940100a4SChris Mason 680f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 681940100a4SChris Mason i++; 682f46b5a66SChristoph Hellwig } 683f46b5a66SChristoph Hellwig 6841e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 6851e701a32SChris Mason filemap_flush(inode->i_mapping); 6861e701a32SChris Mason 6871e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 6881e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 6891e701a32SChris Mason * we have to make sure the IO is actually started and that 6901e701a32SChris Mason * ordered extents get created before we return 6911e701a32SChris Mason */ 6921e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 6931e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 6941e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 6951e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 6961e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 6971e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 6981e701a32SChris Mason } 6991e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7001e701a32SChris Mason 7011e701a32SChris Mason mutex_lock(&inode->i_mutex); 7021e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7031e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7041e701a32SChris Mason } 7051e701a32SChris Mason 706f46b5a66SChristoph Hellwig return 0; 707940100a4SChris Mason 708940100a4SChris Mason err_reservations: 7090ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 7100ca1f7ceSYan, Zheng err_unlock: 711940100a4SChris Mason mutex_unlock(&inode->i_mutex); 712940100a4SChris Mason return ret; 713f46b5a66SChristoph Hellwig } 714f46b5a66SChristoph Hellwig 71576dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 71676dda93cSYan, Zheng void __user *arg) 717f46b5a66SChristoph Hellwig { 718f46b5a66SChristoph Hellwig u64 new_size; 719f46b5a66SChristoph Hellwig u64 old_size; 720f46b5a66SChristoph Hellwig u64 devid = 1; 721f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 722f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 723f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 724f46b5a66SChristoph Hellwig char *sizestr; 725f46b5a66SChristoph Hellwig char *devstr = NULL; 726f46b5a66SChristoph Hellwig int ret = 0; 727f46b5a66SChristoph Hellwig int mod = 0; 728f46b5a66SChristoph Hellwig 729c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 730c146afadSYan Zheng return -EROFS; 731c146afadSYan Zheng 732e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 733e441d54dSChris Mason return -EPERM; 734e441d54dSChris Mason 735dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 736dae7b665SLi Zefan if (IS_ERR(vol_args)) 737dae7b665SLi Zefan return PTR_ERR(vol_args); 7385516e595SMark Fasheh 7395516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 740f46b5a66SChristoph Hellwig 7417d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 742f46b5a66SChristoph Hellwig sizestr = vol_args->name; 743f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 744f46b5a66SChristoph Hellwig if (devstr) { 745f46b5a66SChristoph Hellwig char *end; 746f46b5a66SChristoph Hellwig sizestr = devstr + 1; 747f46b5a66SChristoph Hellwig *devstr = '\0'; 748f46b5a66SChristoph Hellwig devstr = vol_args->name; 749f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 75021380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 75121380931SJoel Becker (unsigned long long)devid); 752f46b5a66SChristoph Hellwig } 7532b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 754f46b5a66SChristoph Hellwig if (!device) { 75521380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 75621380931SJoel Becker (unsigned long long)devid); 757f46b5a66SChristoph Hellwig ret = -EINVAL; 758f46b5a66SChristoph Hellwig goto out_unlock; 759f46b5a66SChristoph Hellwig } 760f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 761f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 762f46b5a66SChristoph Hellwig else { 763f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 764f46b5a66SChristoph Hellwig mod = -1; 765f46b5a66SChristoph Hellwig sizestr++; 766f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 767f46b5a66SChristoph Hellwig mod = 1; 768f46b5a66SChristoph Hellwig sizestr++; 769f46b5a66SChristoph Hellwig } 77091748467SAkinobu Mita new_size = memparse(sizestr, NULL); 771f46b5a66SChristoph Hellwig if (new_size == 0) { 772f46b5a66SChristoph Hellwig ret = -EINVAL; 773f46b5a66SChristoph Hellwig goto out_unlock; 774f46b5a66SChristoph Hellwig } 775f46b5a66SChristoph Hellwig } 776f46b5a66SChristoph Hellwig 777f46b5a66SChristoph Hellwig old_size = device->total_bytes; 778f46b5a66SChristoph Hellwig 779f46b5a66SChristoph Hellwig if (mod < 0) { 780f46b5a66SChristoph Hellwig if (new_size > old_size) { 781f46b5a66SChristoph Hellwig ret = -EINVAL; 782f46b5a66SChristoph Hellwig goto out_unlock; 783f46b5a66SChristoph Hellwig } 784f46b5a66SChristoph Hellwig new_size = old_size - new_size; 785f46b5a66SChristoph Hellwig } else if (mod > 0) { 786f46b5a66SChristoph Hellwig new_size = old_size + new_size; 787f46b5a66SChristoph Hellwig } 788f46b5a66SChristoph Hellwig 789f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 790f46b5a66SChristoph Hellwig ret = -EINVAL; 791f46b5a66SChristoph Hellwig goto out_unlock; 792f46b5a66SChristoph Hellwig } 793f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 794f46b5a66SChristoph Hellwig ret = -EFBIG; 795f46b5a66SChristoph Hellwig goto out_unlock; 796f46b5a66SChristoph Hellwig } 797f46b5a66SChristoph Hellwig 798f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 799f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 800f46b5a66SChristoph Hellwig 801f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 802f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 803f46b5a66SChristoph Hellwig 804f46b5a66SChristoph Hellwig if (new_size > old_size) { 805a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 806f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 807f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 808f46b5a66SChristoph Hellwig } else { 809f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 810f46b5a66SChristoph Hellwig } 811f46b5a66SChristoph Hellwig 812f46b5a66SChristoph Hellwig out_unlock: 8137d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 814f46b5a66SChristoph Hellwig kfree(vol_args); 815f46b5a66SChristoph Hellwig return ret; 816f46b5a66SChristoph Hellwig } 817f46b5a66SChristoph Hellwig 818*72fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 819*72fd032eSSage Weil char *name, 820*72fd032eSSage Weil unsigned long fd, 821*72fd032eSSage Weil int subvol, 822*72fd032eSSage Weil u64 *transid) 823f46b5a66SChristoph Hellwig { 824cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 8253de4586cSChris Mason struct file *src_file; 826f46b5a66SChristoph Hellwig int namelen; 8273de4586cSChris Mason int ret = 0; 828f46b5a66SChristoph Hellwig 829c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 830c146afadSYan Zheng return -EROFS; 831c146afadSYan Zheng 832*72fd032eSSage Weil namelen = strlen(name); 833*72fd032eSSage Weil if (strchr(name, '/')) { 834f46b5a66SChristoph Hellwig ret = -EINVAL; 835f46b5a66SChristoph Hellwig goto out; 836f46b5a66SChristoph Hellwig } 837f46b5a66SChristoph Hellwig 8383de4586cSChris Mason if (subvol) { 839*72fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 840*72fd032eSSage Weil NULL, transid); 841cb8e7090SChristoph Hellwig } else { 8423de4586cSChris Mason struct inode *src_inode; 843*72fd032eSSage Weil src_file = fget(fd); 8443de4586cSChris Mason if (!src_file) { 8453de4586cSChris Mason ret = -EINVAL; 8463de4586cSChris Mason goto out; 8473de4586cSChris Mason } 8483de4586cSChris Mason 8493de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 8503de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 851d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 852d397712bSChris Mason "another FS\n"); 8533de4586cSChris Mason ret = -EINVAL; 8543de4586cSChris Mason fput(src_file); 8553de4586cSChris Mason goto out; 8563de4586cSChris Mason } 857*72fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 858*72fd032eSSage Weil BTRFS_I(src_inode)->root, 859*72fd032eSSage Weil transid); 8603de4586cSChris Mason fput(src_file); 861cb8e7090SChristoph Hellwig } 862f46b5a66SChristoph Hellwig out: 863*72fd032eSSage Weil return ret; 864*72fd032eSSage Weil } 865*72fd032eSSage Weil 866*72fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 867*72fd032eSSage Weil void __user *arg, int subvol, 868*72fd032eSSage Weil int async) 869*72fd032eSSage Weil { 870*72fd032eSSage Weil struct btrfs_ioctl_vol_args *vol_args = NULL; 871*72fd032eSSage Weil struct btrfs_ioctl_async_vol_args *async_vol_args = NULL; 872*72fd032eSSage Weil char *name; 873*72fd032eSSage Weil u64 fd; 874*72fd032eSSage Weil u64 transid = 0; 875*72fd032eSSage Weil int ret; 876*72fd032eSSage Weil 877*72fd032eSSage Weil if (async) { 878*72fd032eSSage Weil async_vol_args = memdup_user(arg, sizeof(*async_vol_args)); 879*72fd032eSSage Weil if (IS_ERR(async_vol_args)) 880*72fd032eSSage Weil return PTR_ERR(async_vol_args); 881*72fd032eSSage Weil 882*72fd032eSSage Weil name = async_vol_args->name; 883*72fd032eSSage Weil fd = async_vol_args->fd; 884*72fd032eSSage Weil async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0'; 885*72fd032eSSage Weil } else { 886*72fd032eSSage Weil vol_args = memdup_user(arg, sizeof(*vol_args)); 887*72fd032eSSage Weil if (IS_ERR(vol_args)) 888*72fd032eSSage Weil return PTR_ERR(vol_args); 889*72fd032eSSage Weil name = vol_args->name; 890*72fd032eSSage Weil fd = vol_args->fd; 891*72fd032eSSage Weil vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 892*72fd032eSSage Weil } 893*72fd032eSSage Weil 894*72fd032eSSage Weil ret = btrfs_ioctl_snap_create_transid(file, name, fd, 895*72fd032eSSage Weil subvol, &transid); 896*72fd032eSSage Weil 897*72fd032eSSage Weil if (!ret && async) { 898*72fd032eSSage Weil if (copy_to_user(arg + 899*72fd032eSSage Weil offsetof(struct btrfs_ioctl_async_vol_args, 900*72fd032eSSage Weil transid), &transid, sizeof(transid))) 901*72fd032eSSage Weil return -EFAULT; 902*72fd032eSSage Weil } 903*72fd032eSSage Weil 904f46b5a66SChristoph Hellwig kfree(vol_args); 905*72fd032eSSage Weil kfree(async_vol_args); 906*72fd032eSSage Weil 907f46b5a66SChristoph Hellwig return ret; 908f46b5a66SChristoph Hellwig } 909f46b5a66SChristoph Hellwig 91076dda93cSYan, Zheng /* 91176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 91276dda93cSYan, Zheng */ 91376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 91476dda93cSYan, Zheng { 91576dda93cSYan, Zheng struct btrfs_path *path; 91676dda93cSYan, Zheng struct btrfs_key key; 91776dda93cSYan, Zheng int ret; 91876dda93cSYan, Zheng 91976dda93cSYan, Zheng path = btrfs_alloc_path(); 92076dda93cSYan, Zheng if (!path) 92176dda93cSYan, Zheng return -ENOMEM; 92276dda93cSYan, Zheng 92376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 92476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 92576dda93cSYan, Zheng key.offset = (u64)-1; 92676dda93cSYan, Zheng 92776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 92876dda93cSYan, Zheng &key, path, 0, 0); 92976dda93cSYan, Zheng if (ret < 0) 93076dda93cSYan, Zheng goto out; 93176dda93cSYan, Zheng BUG_ON(ret == 0); 93276dda93cSYan, Zheng 93376dda93cSYan, Zheng ret = 0; 93476dda93cSYan, Zheng if (path->slots[0] > 0) { 93576dda93cSYan, Zheng path->slots[0]--; 93676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 93776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 93876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 93976dda93cSYan, Zheng ret = -ENOTEMPTY; 94076dda93cSYan, Zheng } 94176dda93cSYan, Zheng out: 94276dda93cSYan, Zheng btrfs_free_path(path); 94376dda93cSYan, Zheng return ret; 94476dda93cSYan, Zheng } 94576dda93cSYan, Zheng 946ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 947ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 948ac8e9819SChris Mason { 949abc6e134SChris Mason struct btrfs_key test; 950abc6e134SChris Mason int ret; 951abc6e134SChris Mason 952abc6e134SChris Mason test.objectid = sk->min_objectid; 953abc6e134SChris Mason test.type = sk->min_type; 954abc6e134SChris Mason test.offset = sk->min_offset; 955abc6e134SChris Mason 956abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 957abc6e134SChris Mason if (ret < 0) 958ac8e9819SChris Mason return 0; 959abc6e134SChris Mason 960abc6e134SChris Mason test.objectid = sk->max_objectid; 961abc6e134SChris Mason test.type = sk->max_type; 962abc6e134SChris Mason test.offset = sk->max_offset; 963abc6e134SChris Mason 964abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 965abc6e134SChris Mason if (ret > 0) 966ac8e9819SChris Mason return 0; 967ac8e9819SChris Mason return 1; 968ac8e9819SChris Mason } 969ac8e9819SChris Mason 970ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 971ac8e9819SChris Mason struct btrfs_path *path, 972ac8e9819SChris Mason struct btrfs_key *key, 973ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 974ac8e9819SChris Mason char *buf, 975ac8e9819SChris Mason unsigned long *sk_offset, 976ac8e9819SChris Mason int *num_found) 977ac8e9819SChris Mason { 978ac8e9819SChris Mason u64 found_transid; 979ac8e9819SChris Mason struct extent_buffer *leaf; 980ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 981ac8e9819SChris Mason unsigned long item_off; 982ac8e9819SChris Mason unsigned long item_len; 983ac8e9819SChris Mason int nritems; 984ac8e9819SChris Mason int i; 985ac8e9819SChris Mason int slot; 986ac8e9819SChris Mason int found = 0; 987ac8e9819SChris Mason int ret = 0; 988ac8e9819SChris Mason 989ac8e9819SChris Mason leaf = path->nodes[0]; 990ac8e9819SChris Mason slot = path->slots[0]; 991ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 992ac8e9819SChris Mason 993ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 994ac8e9819SChris Mason i = nritems; 995ac8e9819SChris Mason goto advance_key; 996ac8e9819SChris Mason } 997ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 998ac8e9819SChris Mason 999ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1000ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1001ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1002ac8e9819SChris Mason 1003ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1004ac8e9819SChris Mason item_len = 0; 1005ac8e9819SChris Mason 1006ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1007ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1008ac8e9819SChris Mason ret = 1; 1009ac8e9819SChris Mason goto overflow; 1010ac8e9819SChris Mason } 1011ac8e9819SChris Mason 1012ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1013ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1014ac8e9819SChris Mason continue; 1015ac8e9819SChris Mason 1016ac8e9819SChris Mason sh.objectid = key->objectid; 1017ac8e9819SChris Mason sh.offset = key->offset; 1018ac8e9819SChris Mason sh.type = key->type; 1019ac8e9819SChris Mason sh.len = item_len; 1020ac8e9819SChris Mason sh.transid = found_transid; 1021ac8e9819SChris Mason 1022ac8e9819SChris Mason /* copy search result header */ 1023ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1024ac8e9819SChris Mason *sk_offset += sizeof(sh); 1025ac8e9819SChris Mason 1026ac8e9819SChris Mason if (item_len) { 1027ac8e9819SChris Mason char *p = buf + *sk_offset; 1028ac8e9819SChris Mason /* copy the item */ 1029ac8e9819SChris Mason read_extent_buffer(leaf, p, 1030ac8e9819SChris Mason item_off, item_len); 1031ac8e9819SChris Mason *sk_offset += item_len; 1032ac8e9819SChris Mason } 103390fdde14SChris Mason found++; 1034ac8e9819SChris Mason 1035ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1036ac8e9819SChris Mason break; 1037ac8e9819SChris Mason } 1038ac8e9819SChris Mason advance_key: 1039ac8e9819SChris Mason ret = 0; 1040abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1041abc6e134SChris Mason key->offset++; 1042abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1043abc6e134SChris Mason key->offset = 0; 1044abc6e134SChris Mason key->type++; 1045abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1046abc6e134SChris Mason key->offset = 0; 1047abc6e134SChris Mason key->type = 0; 1048abc6e134SChris Mason key->objectid++; 1049abc6e134SChris Mason } else 1050abc6e134SChris Mason ret = 1; 1051ac8e9819SChris Mason overflow: 1052ac8e9819SChris Mason *num_found += found; 1053ac8e9819SChris Mason return ret; 1054ac8e9819SChris Mason } 1055ac8e9819SChris Mason 1056ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1057ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1058ac8e9819SChris Mason { 1059ac8e9819SChris Mason struct btrfs_root *root; 1060ac8e9819SChris Mason struct btrfs_key key; 1061ac8e9819SChris Mason struct btrfs_key max_key; 1062ac8e9819SChris Mason struct btrfs_path *path; 1063ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1064ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1065ac8e9819SChris Mason int ret; 1066ac8e9819SChris Mason int num_found = 0; 1067ac8e9819SChris Mason unsigned long sk_offset = 0; 1068ac8e9819SChris Mason 1069ac8e9819SChris Mason path = btrfs_alloc_path(); 1070ac8e9819SChris Mason if (!path) 1071ac8e9819SChris Mason return -ENOMEM; 1072ac8e9819SChris Mason 1073ac8e9819SChris Mason if (sk->tree_id == 0) { 1074ac8e9819SChris Mason /* search the root of the inode that was passed */ 1075ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1076ac8e9819SChris Mason } else { 1077ac8e9819SChris Mason key.objectid = sk->tree_id; 1078ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1079ac8e9819SChris Mason key.offset = (u64)-1; 1080ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1081ac8e9819SChris Mason if (IS_ERR(root)) { 1082ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1083ac8e9819SChris Mason sk->tree_id); 1084ac8e9819SChris Mason btrfs_free_path(path); 1085ac8e9819SChris Mason return -ENOENT; 1086ac8e9819SChris Mason } 1087ac8e9819SChris Mason } 1088ac8e9819SChris Mason 1089ac8e9819SChris Mason key.objectid = sk->min_objectid; 1090ac8e9819SChris Mason key.type = sk->min_type; 1091ac8e9819SChris Mason key.offset = sk->min_offset; 1092ac8e9819SChris Mason 1093ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1094ac8e9819SChris Mason max_key.type = sk->max_type; 1095ac8e9819SChris Mason max_key.offset = sk->max_offset; 1096ac8e9819SChris Mason 1097ac8e9819SChris Mason path->keep_locks = 1; 1098ac8e9819SChris Mason 1099ac8e9819SChris Mason while(1) { 1100ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1101ac8e9819SChris Mason sk->min_transid); 1102ac8e9819SChris Mason if (ret != 0) { 1103ac8e9819SChris Mason if (ret > 0) 1104ac8e9819SChris Mason ret = 0; 1105ac8e9819SChris Mason goto err; 1106ac8e9819SChris Mason } 1107ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1108ac8e9819SChris Mason &sk_offset, &num_found); 1109ac8e9819SChris Mason btrfs_release_path(root, path); 1110ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1111ac8e9819SChris Mason break; 1112ac8e9819SChris Mason 1113ac8e9819SChris Mason } 1114ac8e9819SChris Mason ret = 0; 1115ac8e9819SChris Mason err: 1116ac8e9819SChris Mason sk->nr_items = num_found; 1117ac8e9819SChris Mason btrfs_free_path(path); 1118ac8e9819SChris Mason return ret; 1119ac8e9819SChris Mason } 1120ac8e9819SChris Mason 1121ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1122ac8e9819SChris Mason void __user *argp) 1123ac8e9819SChris Mason { 1124ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1125ac8e9819SChris Mason struct inode *inode; 1126ac8e9819SChris Mason int ret; 1127ac8e9819SChris Mason 1128ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1129ac8e9819SChris Mason return -EPERM; 1130ac8e9819SChris Mason 11312354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 11322354d08fSJulia Lawall if (IS_ERR(args)) 11332354d08fSJulia Lawall return PTR_ERR(args); 1134ac8e9819SChris Mason 1135ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1136ac8e9819SChris Mason ret = search_ioctl(inode, args); 1137ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1138ac8e9819SChris Mason ret = -EFAULT; 1139ac8e9819SChris Mason kfree(args); 1140ac8e9819SChris Mason return ret; 1141ac8e9819SChris Mason } 1142ac8e9819SChris Mason 114398d377a0STARUISI Hiroaki /* 1144ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1145ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 114698d377a0STARUISI Hiroaki */ 114798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 114898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 114998d377a0STARUISI Hiroaki { 115098d377a0STARUISI Hiroaki struct btrfs_root *root; 115198d377a0STARUISI Hiroaki struct btrfs_key key; 1152ac8e9819SChris Mason char *ptr; 115398d377a0STARUISI Hiroaki int ret = -1; 115498d377a0STARUISI Hiroaki int slot; 115598d377a0STARUISI Hiroaki int len; 115698d377a0STARUISI Hiroaki int total_len = 0; 115798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 115898d377a0STARUISI Hiroaki struct extent_buffer *l; 115998d377a0STARUISI Hiroaki struct btrfs_path *path; 116098d377a0STARUISI Hiroaki 116198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 116298d377a0STARUISI Hiroaki name[0]='\0'; 116398d377a0STARUISI Hiroaki return 0; 116498d377a0STARUISI Hiroaki } 116598d377a0STARUISI Hiroaki 116698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 116798d377a0STARUISI Hiroaki if (!path) 116898d377a0STARUISI Hiroaki return -ENOMEM; 116998d377a0STARUISI Hiroaki 1170ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 117198d377a0STARUISI Hiroaki 117298d377a0STARUISI Hiroaki key.objectid = tree_id; 117398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 117498d377a0STARUISI Hiroaki key.offset = (u64)-1; 117598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 117698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 117798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 11788ad6fcabSChris Mason ret = -ENOENT; 11798ad6fcabSChris Mason goto out; 118098d377a0STARUISI Hiroaki } 118198d377a0STARUISI Hiroaki 118298d377a0STARUISI Hiroaki key.objectid = dirid; 118398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 11848ad6fcabSChris Mason key.offset = (u64)-1; 118598d377a0STARUISI Hiroaki 118698d377a0STARUISI Hiroaki while(1) { 118798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 118898d377a0STARUISI Hiroaki if (ret < 0) 118998d377a0STARUISI Hiroaki goto out; 119098d377a0STARUISI Hiroaki 119198d377a0STARUISI Hiroaki l = path->nodes[0]; 119298d377a0STARUISI Hiroaki slot = path->slots[0]; 11938ad6fcabSChris Mason if (ret > 0 && slot > 0) 11948ad6fcabSChris Mason slot--; 119598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 119698d377a0STARUISI Hiroaki 119798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1198ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1199ac8e9819SChris Mason ret = -ENOENT; 120098d377a0STARUISI Hiroaki goto out; 1201ac8e9819SChris Mason } 120298d377a0STARUISI Hiroaki 120398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 120498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 120598d377a0STARUISI Hiroaki ptr -= len + 1; 120698d377a0STARUISI Hiroaki total_len += len + 1; 1207ac8e9819SChris Mason if (ptr < name) 120898d377a0STARUISI Hiroaki goto out; 120998d377a0STARUISI Hiroaki 121098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 121198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 121298d377a0STARUISI Hiroaki 121398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 121498d377a0STARUISI Hiroaki break; 121598d377a0STARUISI Hiroaki 121698d377a0STARUISI Hiroaki btrfs_release_path(root, path); 121798d377a0STARUISI Hiroaki key.objectid = key.offset; 12188ad6fcabSChris Mason key.offset = (u64)-1; 121998d377a0STARUISI Hiroaki dirid = key.objectid; 122098d377a0STARUISI Hiroaki 122198d377a0STARUISI Hiroaki } 1222ac8e9819SChris Mason if (ptr < name) 122398d377a0STARUISI Hiroaki goto out; 1224ac8e9819SChris Mason memcpy(name, ptr, total_len); 122598d377a0STARUISI Hiroaki name[total_len]='\0'; 122698d377a0STARUISI Hiroaki ret = 0; 122798d377a0STARUISI Hiroaki out: 122898d377a0STARUISI Hiroaki btrfs_free_path(path); 1229ac8e9819SChris Mason return ret; 1230ac8e9819SChris Mason } 1231ac8e9819SChris Mason 1232ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1233ac8e9819SChris Mason void __user *argp) 1234ac8e9819SChris Mason { 1235ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1236ac8e9819SChris Mason struct inode *inode; 1237ac8e9819SChris Mason int ret; 1238ac8e9819SChris Mason 1239ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1240ac8e9819SChris Mason return -EPERM; 1241ac8e9819SChris Mason 12422354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 12432354d08fSJulia Lawall if (IS_ERR(args)) 12442354d08fSJulia Lawall return PTR_ERR(args); 1245c2b96929SDan Carpenter 1246ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1247ac8e9819SChris Mason 12481b53ac4dSChris Mason if (args->treeid == 0) 12491b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 12501b53ac4dSChris Mason 1251ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1252ac8e9819SChris Mason args->treeid, args->objectid, 1253ac8e9819SChris Mason args->name); 1254ac8e9819SChris Mason 1255ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1256ac8e9819SChris Mason ret = -EFAULT; 1257ac8e9819SChris Mason 1258ac8e9819SChris Mason kfree(args); 125998d377a0STARUISI Hiroaki return ret; 126098d377a0STARUISI Hiroaki } 126198d377a0STARUISI Hiroaki 126276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 126376dda93cSYan, Zheng void __user *arg) 126476dda93cSYan, Zheng { 126576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 126676dda93cSYan, Zheng struct dentry *dentry; 126776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 126876dda93cSYan, Zheng struct inode *inode; 126976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 127076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 127176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 127276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 127376dda93cSYan, Zheng int namelen; 127476dda93cSYan, Zheng int ret; 127576dda93cSYan, Zheng int err = 0; 127676dda93cSYan, Zheng 127776dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 127876dda93cSYan, Zheng return -EPERM; 127976dda93cSYan, Zheng 128076dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 128176dda93cSYan, Zheng if (IS_ERR(vol_args)) 128276dda93cSYan, Zheng return PTR_ERR(vol_args); 128376dda93cSYan, Zheng 128476dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 128576dda93cSYan, Zheng namelen = strlen(vol_args->name); 128676dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 128776dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 128876dda93cSYan, Zheng err = -EINVAL; 128976dda93cSYan, Zheng goto out; 129076dda93cSYan, Zheng } 129176dda93cSYan, Zheng 129276dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 129376dda93cSYan, Zheng if (err) 129476dda93cSYan, Zheng goto out; 129576dda93cSYan, Zheng 129676dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 129776dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 129876dda93cSYan, Zheng if (IS_ERR(dentry)) { 129976dda93cSYan, Zheng err = PTR_ERR(dentry); 130076dda93cSYan, Zheng goto out_unlock_dir; 130176dda93cSYan, Zheng } 130276dda93cSYan, Zheng 130376dda93cSYan, Zheng if (!dentry->d_inode) { 130476dda93cSYan, Zheng err = -ENOENT; 130576dda93cSYan, Zheng goto out_dput; 130676dda93cSYan, Zheng } 130776dda93cSYan, Zheng 130876dda93cSYan, Zheng inode = dentry->d_inode; 130976dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 131076dda93cSYan, Zheng err = -EINVAL; 131176dda93cSYan, Zheng goto out_dput; 131276dda93cSYan, Zheng } 131376dda93cSYan, Zheng 131476dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 131576dda93cSYan, Zheng 131676dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 131776dda93cSYan, Zheng err = d_invalidate(dentry); 131876dda93cSYan, Zheng if (err) 131976dda93cSYan, Zheng goto out_unlock; 132076dda93cSYan, Zheng 132176dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 132276dda93cSYan, Zheng 132376dda93cSYan, Zheng err = may_destroy_subvol(dest); 132476dda93cSYan, Zheng if (err) 132576dda93cSYan, Zheng goto out_up_write; 132676dda93cSYan, Zheng 1327a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1328a22285a6SYan, Zheng if (IS_ERR(trans)) { 1329a22285a6SYan, Zheng err = PTR_ERR(trans); 1330d327099aSDan Carpenter goto out_up_write; 1331a22285a6SYan, Zheng } 1332a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1333a22285a6SYan, Zheng 133476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 133576dda93cSYan, Zheng dest->root_key.objectid, 133676dda93cSYan, Zheng dentry->d_name.name, 133776dda93cSYan, Zheng dentry->d_name.len); 133876dda93cSYan, Zheng BUG_ON(ret); 133976dda93cSYan, Zheng 134076dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 134176dda93cSYan, Zheng 134276dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 134376dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 134476dda93cSYan, Zheng dest->root_item.drop_level = 0; 134576dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 134676dda93cSYan, Zheng 1347d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 134876dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 134976dda93cSYan, Zheng root->fs_info->tree_root, 135076dda93cSYan, Zheng dest->root_key.objectid); 135176dda93cSYan, Zheng BUG_ON(ret); 1352d68fc57bSYan, Zheng } 135376dda93cSYan, Zheng 135476dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 135576dda93cSYan, Zheng BUG_ON(ret); 135676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 135776dda93cSYan, Zheng out_up_write: 135876dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 135976dda93cSYan, Zheng out_unlock: 136076dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 136176dda93cSYan, Zheng if (!err) { 1362efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 136376dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 136476dda93cSYan, Zheng d_delete(dentry); 136576dda93cSYan, Zheng } 136676dda93cSYan, Zheng out_dput: 136776dda93cSYan, Zheng dput(dentry); 136876dda93cSYan, Zheng out_unlock_dir: 136976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 137076dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 137176dda93cSYan, Zheng out: 137276dda93cSYan, Zheng kfree(vol_args); 137376dda93cSYan, Zheng return err; 137476dda93cSYan, Zheng } 137576dda93cSYan, Zheng 13761e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1377f46b5a66SChristoph Hellwig { 1378f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1379f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 13801e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1381c146afadSYan Zheng int ret; 1382c146afadSYan Zheng 1383c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1384c146afadSYan Zheng if (ret) 1385c146afadSYan Zheng return ret; 1386f46b5a66SChristoph Hellwig 1387f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1388f46b5a66SChristoph Hellwig case S_IFDIR: 1389e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1390e441d54dSChris Mason ret = -EPERM; 1391e441d54dSChris Mason goto out; 1392e441d54dSChris Mason } 13938929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 13948929ecfaSYan, Zheng if (ret) 13958929ecfaSYan, Zheng goto out; 13968929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1397f46b5a66SChristoph Hellwig break; 1398f46b5a66SChristoph Hellwig case S_IFREG: 1399e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1400e441d54dSChris Mason ret = -EINVAL; 1401e441d54dSChris Mason goto out; 1402e441d54dSChris Mason } 14031e701a32SChris Mason 14041e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 14051e701a32SChris Mason if (!range) { 14061e701a32SChris Mason ret = -ENOMEM; 14071e701a32SChris Mason goto out; 14081e701a32SChris Mason } 14091e701a32SChris Mason 14101e701a32SChris Mason if (argp) { 14111e701a32SChris Mason if (copy_from_user(range, argp, 14121e701a32SChris Mason sizeof(*range))) { 14131e701a32SChris Mason ret = -EFAULT; 14141e701a32SChris Mason kfree(range); 1415683be16eSDan Carpenter goto out; 14161e701a32SChris Mason } 14171e701a32SChris Mason /* compression requires us to start the IO */ 14181e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14191e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 14201e701a32SChris Mason range->extent_thresh = (u32)-1; 14211e701a32SChris Mason } 14221e701a32SChris Mason } else { 14231e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 14241e701a32SChris Mason range->len = (u64)-1; 14251e701a32SChris Mason } 14268929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 14271e701a32SChris Mason kfree(range); 1428f46b5a66SChristoph Hellwig break; 14298929ecfaSYan, Zheng default: 14308929ecfaSYan, Zheng ret = -EINVAL; 1431f46b5a66SChristoph Hellwig } 1432e441d54dSChris Mason out: 1433ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1434e441d54dSChris Mason return ret; 1435f46b5a66SChristoph Hellwig } 1436f46b5a66SChristoph Hellwig 1437b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1438f46b5a66SChristoph Hellwig { 1439f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1440f46b5a66SChristoph Hellwig int ret; 1441f46b5a66SChristoph Hellwig 1442e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1443e441d54dSChris Mason return -EPERM; 1444e441d54dSChris Mason 1445dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1446dae7b665SLi Zefan if (IS_ERR(vol_args)) 1447dae7b665SLi Zefan return PTR_ERR(vol_args); 1448f46b5a66SChristoph Hellwig 14495516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1450f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1451f46b5a66SChristoph Hellwig 1452f46b5a66SChristoph Hellwig kfree(vol_args); 1453f46b5a66SChristoph Hellwig return ret; 1454f46b5a66SChristoph Hellwig } 1455f46b5a66SChristoph Hellwig 1456b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1457f46b5a66SChristoph Hellwig { 1458f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1459f46b5a66SChristoph Hellwig int ret; 1460f46b5a66SChristoph Hellwig 1461e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1462e441d54dSChris Mason return -EPERM; 1463e441d54dSChris Mason 1464c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1465c146afadSYan Zheng return -EROFS; 1466c146afadSYan Zheng 1467dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1468dae7b665SLi Zefan if (IS_ERR(vol_args)) 1469dae7b665SLi Zefan return PTR_ERR(vol_args); 1470f46b5a66SChristoph Hellwig 14715516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1472f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1473f46b5a66SChristoph Hellwig 1474f46b5a66SChristoph Hellwig kfree(vol_args); 1475f46b5a66SChristoph Hellwig return ret; 1476f46b5a66SChristoph Hellwig } 1477f46b5a66SChristoph Hellwig 147876dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1479b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1480f46b5a66SChristoph Hellwig { 1481f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1482f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1483f46b5a66SChristoph Hellwig struct file *src_file; 1484f46b5a66SChristoph Hellwig struct inode *src; 1485f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1486f46b5a66SChristoph Hellwig struct btrfs_path *path; 1487f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1488ae01a0abSYan Zheng char *buf; 1489ae01a0abSYan Zheng struct btrfs_key key; 1490f46b5a66SChristoph Hellwig u32 nritems; 1491f46b5a66SChristoph Hellwig int slot; 1492ae01a0abSYan Zheng int ret; 1493c5c9cd4dSSage Weil u64 len = olen; 1494c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1495c5c9cd4dSSage Weil u64 hint_byte; 1496d20f7043SChris Mason 1497c5c9cd4dSSage Weil /* 1498c5c9cd4dSSage Weil * TODO: 1499c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1500c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1501c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1502c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1503c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1504c5c9cd4dSSage Weil * they don't overlap)? 1505c5c9cd4dSSage Weil */ 1506c5c9cd4dSSage Weil 1507e441d54dSChris Mason /* the destination must be opened for writing */ 15082ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1509e441d54dSChris Mason return -EINVAL; 1510e441d54dSChris Mason 1511c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1512c146afadSYan Zheng if (ret) 1513c146afadSYan Zheng return ret; 1514c146afadSYan Zheng 1515c5c9cd4dSSage Weil src_file = fget(srcfd); 1516ab67b7c1SYan Zheng if (!src_file) { 1517ab67b7c1SYan Zheng ret = -EBADF; 1518ab67b7c1SYan Zheng goto out_drop_write; 1519ab67b7c1SYan Zheng } 15205dc64164SDan Rosenberg 1521f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1522f46b5a66SChristoph Hellwig 1523c5c9cd4dSSage Weil ret = -EINVAL; 1524c5c9cd4dSSage Weil if (src == inode) 1525c5c9cd4dSSage Weil goto out_fput; 1526c5c9cd4dSSage Weil 15275dc64164SDan Rosenberg /* the src must be open for reading */ 15285dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 15295dc64164SDan Rosenberg goto out_fput; 15305dc64164SDan Rosenberg 1531ae01a0abSYan Zheng ret = -EISDIR; 1532ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1533f46b5a66SChristoph Hellwig goto out_fput; 1534f46b5a66SChristoph Hellwig 1535ae01a0abSYan Zheng ret = -EXDEV; 1536ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1537ae01a0abSYan Zheng goto out_fput; 1538ae01a0abSYan Zheng 1539ae01a0abSYan Zheng ret = -ENOMEM; 1540ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1541ae01a0abSYan Zheng if (!buf) 1542ae01a0abSYan Zheng goto out_fput; 1543ae01a0abSYan Zheng 1544ae01a0abSYan Zheng path = btrfs_alloc_path(); 1545ae01a0abSYan Zheng if (!path) { 1546ae01a0abSYan Zheng vfree(buf); 1547ae01a0abSYan Zheng goto out_fput; 1548ae01a0abSYan Zheng } 1549ae01a0abSYan Zheng path->reada = 2; 1550ae01a0abSYan Zheng 1551f46b5a66SChristoph Hellwig if (inode < src) { 1552fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1553fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1554f46b5a66SChristoph Hellwig } else { 1555fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1556fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1557f46b5a66SChristoph Hellwig } 1558f46b5a66SChristoph Hellwig 1559c5c9cd4dSSage Weil /* determine range to clone */ 1560c5c9cd4dSSage Weil ret = -EINVAL; 15612ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1562f46b5a66SChristoph Hellwig goto out_unlock; 1563c5c9cd4dSSage Weil if (len == 0) 1564c5c9cd4dSSage Weil olen = len = src->i_size - off; 1565c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1566c5c9cd4dSSage Weil if (off + len == src->i_size) 1567c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1568c5c9cd4dSSage Weil - off; 1569c5c9cd4dSSage Weil 1570c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1571c5c9cd4dSSage Weil if ((off & (bs-1)) || 1572c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1573c5c9cd4dSSage Weil goto out_unlock; 1574c5c9cd4dSSage Weil 1575f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1576f46b5a66SChristoph Hellwig another, and lock file content */ 1577f46b5a66SChristoph Hellwig while (1) { 157831840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1579c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 15809a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 15819a019196SSage Weil if (!ordered && 15829a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 15839a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1584f46b5a66SChristoph Hellwig break; 1585c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1586ae01a0abSYan Zheng if (ordered) 1587ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 15889a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1589f46b5a66SChristoph Hellwig } 1590f46b5a66SChristoph Hellwig 1591c5c9cd4dSSage Weil /* clone data */ 1592f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1593ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1594ae01a0abSYan Zheng key.offset = 0; 1595f46b5a66SChristoph Hellwig 1596f46b5a66SChristoph Hellwig while (1) { 1597f46b5a66SChristoph Hellwig /* 1598f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1599f46b5a66SChristoph Hellwig * tree. 1600f46b5a66SChristoph Hellwig */ 1601a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1602f46b5a66SChristoph Hellwig if (ret < 0) 1603f46b5a66SChristoph Hellwig goto out; 1604f46b5a66SChristoph Hellwig 1605ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1606ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1607f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1608f46b5a66SChristoph Hellwig if (ret < 0) 1609f46b5a66SChristoph Hellwig goto out; 1610f46b5a66SChristoph Hellwig if (ret > 0) 1611f46b5a66SChristoph Hellwig break; 1612ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1613f46b5a66SChristoph Hellwig } 1614f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1615f46b5a66SChristoph Hellwig slot = path->slots[0]; 1616f46b5a66SChristoph Hellwig 1617ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1618d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1619f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1620f46b5a66SChristoph Hellwig break; 1621f46b5a66SChristoph Hellwig 1622c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1623c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1624c5c9cd4dSSage Weil int type; 162531840ae1SZheng Yan u32 size; 162631840ae1SZheng Yan struct btrfs_key new_key; 1627c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1628c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1629c5c9cd4dSSage Weil u8 comp; 1630b5384d48SSage Weil u64 endoff; 163131840ae1SZheng Yan 163231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 163331840ae1SZheng Yan read_extent_buffer(leaf, buf, 163431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 163531840ae1SZheng Yan size); 1636c5c9cd4dSSage Weil 1637c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1638c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1639c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1640c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1641c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1642c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1643d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1644d397712bSChris Mason extent); 1645d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1646d397712bSChris Mason extent); 1647c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1648d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1649d397712bSChris Mason extent); 1650c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1651c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1652c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1653c5c9cd4dSSage Weil extent); 1654c5c9cd4dSSage Weil } 165531840ae1SZheng Yan btrfs_release_path(root, path); 165631840ae1SZheng Yan 1657050006a7SSage Weil if (key.offset + datal <= off || 1658c5c9cd4dSSage Weil key.offset >= off+len) 1659c5c9cd4dSSage Weil goto next; 1660c5c9cd4dSSage Weil 166131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 166231840ae1SZheng Yan new_key.objectid = inode->i_ino; 1663c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1664c5c9cd4dSSage Weil 1665a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1666a22285a6SYan, Zheng if (IS_ERR(trans)) { 1667a22285a6SYan, Zheng ret = PTR_ERR(trans); 1668a22285a6SYan, Zheng goto out; 1669a22285a6SYan, Zheng } 1670a22285a6SYan, Zheng 1671c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1672c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1673a22285a6SYan, Zheng if (off > key.offset) { 1674a22285a6SYan, Zheng datao += off - key.offset; 1675a22285a6SYan, Zheng datal -= off - key.offset; 1676a22285a6SYan, Zheng } 1677a22285a6SYan, Zheng 1678a22285a6SYan, Zheng if (key.offset + datal > off + len) 1679a22285a6SYan, Zheng datal = off + len - key.offset; 1680a22285a6SYan, Zheng 1681a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1682a22285a6SYan, Zheng new_key.offset, 1683a22285a6SYan, Zheng new_key.offset + datal, 1684a22285a6SYan, Zheng &hint_byte, 1); 1685a22285a6SYan, Zheng BUG_ON(ret); 1686a22285a6SYan, Zheng 168731840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 168831840ae1SZheng Yan &new_key, size); 1689a22285a6SYan, Zheng BUG_ON(ret); 169031840ae1SZheng Yan 169131840ae1SZheng Yan leaf = path->nodes[0]; 169231840ae1SZheng Yan slot = path->slots[0]; 169331840ae1SZheng Yan write_extent_buffer(leaf, buf, 169431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 169531840ae1SZheng Yan size); 1696ae01a0abSYan Zheng 1697f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1698f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1699c5c9cd4dSSage Weil 1700c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1701c5c9cd4dSSage Weil if (!disko) 1702c5c9cd4dSSage Weil datao = 0; 1703c5c9cd4dSSage Weil 1704c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1705c5c9cd4dSSage Weil datao); 1706c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1707c5c9cd4dSSage Weil datal); 1708c5c9cd4dSSage Weil if (disko) { 1709c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1710ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 17115d4f98a2SYan Zheng disko, diskl, 0, 1712f46b5a66SChristoph Hellwig root->root_key.objectid, 17135d4f98a2SYan Zheng inode->i_ino, 17145d4f98a2SYan Zheng new_key.offset - datao); 1715ae01a0abSYan Zheng BUG_ON(ret); 1716f46b5a66SChristoph Hellwig } 1717c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1718c5c9cd4dSSage Weil u64 skip = 0; 1719c5c9cd4dSSage Weil u64 trim = 0; 1720c5c9cd4dSSage Weil if (off > key.offset) { 1721c5c9cd4dSSage Weil skip = off - key.offset; 1722c5c9cd4dSSage Weil new_key.offset += skip; 172331840ae1SZheng Yan } 1724d397712bSChris Mason 1725c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1726c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1727d397712bSChris Mason 1728c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1729c5c9cd4dSSage Weil ret = -EINVAL; 1730a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1731c5c9cd4dSSage Weil goto out; 173231840ae1SZheng Yan } 1733c5c9cd4dSSage Weil size -= skip + trim; 1734c5c9cd4dSSage Weil datal -= skip + trim; 1735a22285a6SYan, Zheng 1736a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1737a22285a6SYan, Zheng new_key.offset, 1738a22285a6SYan, Zheng new_key.offset + datal, 1739a22285a6SYan, Zheng &hint_byte, 1); 1740a22285a6SYan, Zheng BUG_ON(ret); 1741a22285a6SYan, Zheng 1742c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1743c5c9cd4dSSage Weil &new_key, size); 1744a22285a6SYan, Zheng BUG_ON(ret); 1745c5c9cd4dSSage Weil 1746c5c9cd4dSSage Weil if (skip) { 1747d397712bSChris Mason u32 start = 1748d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1749c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1750c5c9cd4dSSage Weil datal); 1751c5c9cd4dSSage Weil } 1752c5c9cd4dSSage Weil 1753c5c9cd4dSSage Weil leaf = path->nodes[0]; 1754c5c9cd4dSSage Weil slot = path->slots[0]; 1755c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1756c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1757c5c9cd4dSSage Weil size); 1758c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1759c5c9cd4dSSage Weil } 1760c5c9cd4dSSage Weil 1761c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1762a22285a6SYan, Zheng btrfs_release_path(root, path); 1763c5c9cd4dSSage Weil 1764a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1765b5384d48SSage Weil 1766b5384d48SSage Weil /* 1767b5384d48SSage Weil * we round up to the block size at eof when 1768b5384d48SSage Weil * determining which extents to clone above, 1769b5384d48SSage Weil * but shouldn't round up the file size 1770b5384d48SSage Weil */ 1771b5384d48SSage Weil endoff = new_key.offset + datal; 1772b5384d48SSage Weil if (endoff > off+olen) 1773b5384d48SSage Weil endoff = off+olen; 1774b5384d48SSage Weil if (endoff > inode->i_size) 1775b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 1776b5384d48SSage Weil 1777a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1778a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 1779a22285a6SYan, Zheng BUG_ON(ret); 1780a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1781a22285a6SYan, Zheng } 1782c5c9cd4dSSage Weil next: 178331840ae1SZheng Yan btrfs_release_path(root, path); 1784ae01a0abSYan Zheng key.offset++; 1785ae01a0abSYan Zheng } 1786f46b5a66SChristoph Hellwig ret = 0; 1787f46b5a66SChristoph Hellwig out: 1788ae01a0abSYan Zheng btrfs_release_path(root, path); 1789c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1790f46b5a66SChristoph Hellwig out_unlock: 1791f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1792f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1793ae01a0abSYan Zheng vfree(buf); 1794ae01a0abSYan Zheng btrfs_free_path(path); 1795f46b5a66SChristoph Hellwig out_fput: 1796f46b5a66SChristoph Hellwig fput(src_file); 1797ab67b7c1SYan Zheng out_drop_write: 1798ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1799f46b5a66SChristoph Hellwig return ret; 1800f46b5a66SChristoph Hellwig } 1801f46b5a66SChristoph Hellwig 18027a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1803c5c9cd4dSSage Weil { 1804c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1805c5c9cd4dSSage Weil 18067a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1807c5c9cd4dSSage Weil return -EFAULT; 1808c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1809c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1810c5c9cd4dSSage Weil } 1811c5c9cd4dSSage Weil 1812f46b5a66SChristoph Hellwig /* 1813f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1814f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1815f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1816f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1817f46b5a66SChristoph Hellwig */ 1818b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1819f46b5a66SChristoph Hellwig { 1820f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1821f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1822f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 18231ab86aedSSage Weil int ret; 1824f46b5a66SChristoph Hellwig 18251ab86aedSSage Weil ret = -EPERM; 1826df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1827f46b5a66SChristoph Hellwig goto out; 18281ab86aedSSage Weil 18291ab86aedSSage Weil ret = -EINPROGRESS; 18301ab86aedSSage Weil if (file->private_data) 18311ab86aedSSage Weil goto out; 18329ca9ee09SSage Weil 1833c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1834c146afadSYan Zheng if (ret) 1835c146afadSYan Zheng goto out; 1836c146afadSYan Zheng 18379ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 18389ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 18399ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 18409ca9ee09SSage Weil 1841f46b5a66SChristoph Hellwig ret = -ENOMEM; 18421ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 18431ab86aedSSage Weil if (!trans) 18441ab86aedSSage Weil goto out_drop; 18451ab86aedSSage Weil 18461ab86aedSSage Weil file->private_data = trans; 18471ab86aedSSage Weil return 0; 18481ab86aedSSage Weil 18491ab86aedSSage Weil out_drop: 18501ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 18511ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 18521ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 18531ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1854f46b5a66SChristoph Hellwig out: 1855f46b5a66SChristoph Hellwig return ret; 1856f46b5a66SChristoph Hellwig } 1857f46b5a66SChristoph Hellwig 18586ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 18596ef5ed0dSJosef Bacik { 18606ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 18616ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 18626ef5ed0dSJosef Bacik struct btrfs_root *new_root; 18636ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 18646ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 18656ef5ed0dSJosef Bacik struct btrfs_path *path; 18666ef5ed0dSJosef Bacik struct btrfs_key location; 18676ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 18686ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 18696ef5ed0dSJosef Bacik u64 features; 18706ef5ed0dSJosef Bacik u64 objectid = 0; 18716ef5ed0dSJosef Bacik u64 dir_id; 18726ef5ed0dSJosef Bacik 18736ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 18746ef5ed0dSJosef Bacik return -EPERM; 18756ef5ed0dSJosef Bacik 18766ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 18776ef5ed0dSJosef Bacik return -EFAULT; 18786ef5ed0dSJosef Bacik 18796ef5ed0dSJosef Bacik if (!objectid) 18806ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 18816ef5ed0dSJosef Bacik 18826ef5ed0dSJosef Bacik location.objectid = objectid; 18836ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 18846ef5ed0dSJosef Bacik location.offset = (u64)-1; 18856ef5ed0dSJosef Bacik 18866ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 18876ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 18886ef5ed0dSJosef Bacik return PTR_ERR(new_root); 18896ef5ed0dSJosef Bacik 18906ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 18916ef5ed0dSJosef Bacik return -ENOENT; 18926ef5ed0dSJosef Bacik 18936ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 18946ef5ed0dSJosef Bacik if (!path) 18956ef5ed0dSJosef Bacik return -ENOMEM; 18966ef5ed0dSJosef Bacik path->leave_spinning = 1; 18976ef5ed0dSJosef Bacik 18986ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 18996ef5ed0dSJosef Bacik if (!trans) { 19006ef5ed0dSJosef Bacik btrfs_free_path(path); 19016ef5ed0dSJosef Bacik return -ENOMEM; 19026ef5ed0dSJosef Bacik } 19036ef5ed0dSJosef Bacik 19046ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 19056ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 19066ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 1907cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 19086ef5ed0dSJosef Bacik btrfs_free_path(path); 19096ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 19106ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 19116ef5ed0dSJosef Bacik "this isn't going to work\n"); 19126ef5ed0dSJosef Bacik return -ENOENT; 19136ef5ed0dSJosef Bacik } 19146ef5ed0dSJosef Bacik 19156ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 19166ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 19176ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 19186ef5ed0dSJosef Bacik btrfs_free_path(path); 19196ef5ed0dSJosef Bacik 19206ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 19216ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 19226ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 19236ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 19246ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 19256ef5ed0dSJosef Bacik } 19266ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 19276ef5ed0dSJosef Bacik 19286ef5ed0dSJosef Bacik return 0; 19296ef5ed0dSJosef Bacik } 19306ef5ed0dSJosef Bacik 1931bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 1932bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 1933bf5fc093SJosef Bacik { 1934bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 1935bf5fc093SJosef Bacik 1936bf5fc093SJosef Bacik space->total_bytes = 0; 1937bf5fc093SJosef Bacik space->used_bytes = 0; 1938bf5fc093SJosef Bacik space->flags = 0; 1939bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 1940bf5fc093SJosef Bacik space->flags = block_group->flags; 1941bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 1942bf5fc093SJosef Bacik space->used_bytes += 1943bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 1944bf5fc093SJosef Bacik } 1945bf5fc093SJosef Bacik } 1946bf5fc093SJosef Bacik 19471406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 19481406e432SJosef Bacik { 19491406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 19501406e432SJosef Bacik struct btrfs_ioctl_space_info space; 19511406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 19527fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 19537fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 19541406e432SJosef Bacik struct btrfs_space_info *info; 1955bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 1956bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 1957bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 1958bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 1959bf5fc093SJosef Bacik int num_types = 4; 19607fde62bfSChris Mason int alloc_size; 19611406e432SJosef Bacik int ret = 0; 19627fde62bfSChris Mason int slot_count = 0; 1963bf5fc093SJosef Bacik int i, c; 19641406e432SJosef Bacik 19651406e432SJosef Bacik if (copy_from_user(&space_args, 19661406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 19671406e432SJosef Bacik sizeof(space_args))) 19681406e432SJosef Bacik return -EFAULT; 19691406e432SJosef Bacik 1970bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 1971bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 1972bf5fc093SJosef Bacik 1973bf5fc093SJosef Bacik info = NULL; 19747fde62bfSChris Mason rcu_read_lock(); 1975bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 1976bf5fc093SJosef Bacik list) { 1977bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 1978bf5fc093SJosef Bacik info = tmp; 1979bf5fc093SJosef Bacik break; 1980bf5fc093SJosef Bacik } 1981bf5fc093SJosef Bacik } 19827fde62bfSChris Mason rcu_read_unlock(); 19831406e432SJosef Bacik 1984bf5fc093SJosef Bacik if (!info) 1985bf5fc093SJosef Bacik continue; 1986bf5fc093SJosef Bacik 1987bf5fc093SJosef Bacik down_read(&info->groups_sem); 1988bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 1989bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 1990bf5fc093SJosef Bacik slot_count++; 1991bf5fc093SJosef Bacik } 1992bf5fc093SJosef Bacik up_read(&info->groups_sem); 1993bf5fc093SJosef Bacik } 1994bf5fc093SJosef Bacik 19957fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 19967fde62bfSChris Mason if (space_args.space_slots == 0) { 19977fde62bfSChris Mason space_args.total_spaces = slot_count; 19987fde62bfSChris Mason goto out; 19997fde62bfSChris Mason } 2000bf5fc093SJosef Bacik 2001bf5fc093SJosef Bacik slot_count = min_t(int, space_args.space_slots, slot_count); 2002bf5fc093SJosef Bacik 20037fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2004bf5fc093SJosef Bacik 20057fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 20067fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 20077fde62bfSChris Mason */ 20087fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 20097fde62bfSChris Mason return -ENOMEM; 20107fde62bfSChris Mason 20117fde62bfSChris Mason space_args.total_spaces = 0; 20127fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 20137fde62bfSChris Mason if (!dest) 20147fde62bfSChris Mason return -ENOMEM; 20157fde62bfSChris Mason dest_orig = dest; 20167fde62bfSChris Mason 20177fde62bfSChris Mason /* now we have a buffer to copy into */ 2018bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2019bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2020bf5fc093SJosef Bacik 2021bf5fc093SJosef Bacik info = NULL; 20221406e432SJosef Bacik rcu_read_lock(); 2023bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2024bf5fc093SJosef Bacik list) { 2025bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2026bf5fc093SJosef Bacik info = tmp; 20277fde62bfSChris Mason break; 2028bf5fc093SJosef Bacik } 2029bf5fc093SJosef Bacik } 2030bf5fc093SJosef Bacik rcu_read_unlock(); 20317fde62bfSChris Mason 2032bf5fc093SJosef Bacik if (!info) 2033bf5fc093SJosef Bacik continue; 2034bf5fc093SJosef Bacik down_read(&info->groups_sem); 2035bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2036bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2037bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2038bf5fc093SJosef Bacik &space); 20397fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 20401406e432SJosef Bacik dest++; 20411406e432SJosef Bacik space_args.total_spaces++; 20421406e432SJosef Bacik } 2043bf5fc093SJosef Bacik } 2044bf5fc093SJosef Bacik up_read(&info->groups_sem); 2045bf5fc093SJosef Bacik } 20461406e432SJosef Bacik 20477fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 20487fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 20497fde62bfSChris Mason 20507fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 20517fde62bfSChris Mason ret = -EFAULT; 20527fde62bfSChris Mason 20537fde62bfSChris Mason kfree(dest_orig); 20547fde62bfSChris Mason out: 20557fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 20561406e432SJosef Bacik ret = -EFAULT; 20571406e432SJosef Bacik 20581406e432SJosef Bacik return ret; 20591406e432SJosef Bacik } 20601406e432SJosef Bacik 2061f46b5a66SChristoph Hellwig /* 2062f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2063f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2064f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2065f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2066f46b5a66SChristoph Hellwig */ 2067f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2068f46b5a66SChristoph Hellwig { 2069f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2070f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2071f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2072f46b5a66SChristoph Hellwig 2073f46b5a66SChristoph Hellwig trans = file->private_data; 20741ab86aedSSage Weil if (!trans) 20751ab86aedSSage Weil return -EINVAL; 2076b214107eSChristoph Hellwig file->private_data = NULL; 20779ca9ee09SSage Weil 20781ab86aedSSage Weil btrfs_end_transaction(trans, root); 20791ab86aedSSage Weil 20809ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 20819ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 20829ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 20839ca9ee09SSage Weil 2084cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 20851ab86aedSSage Weil return 0; 2086f46b5a66SChristoph Hellwig } 2087f46b5a66SChristoph Hellwig 208846204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 208946204592SSage Weil { 209046204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 209146204592SSage Weil struct btrfs_trans_handle *trans; 209246204592SSage Weil u64 transid; 209346204592SSage Weil 209446204592SSage Weil trans = btrfs_start_transaction(root, 0); 209546204592SSage Weil transid = trans->transid; 209646204592SSage Weil btrfs_commit_transaction_async(trans, root, 0); 209746204592SSage Weil 209846204592SSage Weil if (argp) 209946204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 210046204592SSage Weil return -EFAULT; 210146204592SSage Weil return 0; 210246204592SSage Weil } 210346204592SSage Weil 210446204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 210546204592SSage Weil { 210646204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 210746204592SSage Weil u64 transid; 210846204592SSage Weil 210946204592SSage Weil if (argp) { 211046204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 211146204592SSage Weil return -EFAULT; 211246204592SSage Weil } else { 211346204592SSage Weil transid = 0; /* current trans */ 211446204592SSage Weil } 211546204592SSage Weil return btrfs_wait_for_commit(root, transid); 211646204592SSage Weil } 211746204592SSage Weil 2118f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2119f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2120f46b5a66SChristoph Hellwig { 2121f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 21224bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2123f46b5a66SChristoph Hellwig 2124f46b5a66SChristoph Hellwig switch (cmd) { 21256cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 21266cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 21276cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 21286cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 21296cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 21306cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2131f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2132*72fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 0, 0); 2133*72fd032eSSage Weil case BTRFS_IOC_SNAP_CREATE_ASYNC: 2134*72fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 0, 1); 21353de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2136*72fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 1, 0); 213776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 213876dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 21396ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 21406ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2141f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 21421e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 21431e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 21441e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2145f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 21464bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2147f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 21484bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2149f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 21504bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2151f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2152f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2153f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2154c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2155c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 21567a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2157f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2158f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2159f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2160f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2161ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2162ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2163ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2164ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 21651406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 21661406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2167f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2168f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2169f46b5a66SChristoph Hellwig return 0; 217046204592SSage Weil case BTRFS_IOC_START_SYNC: 217146204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 217246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 217346204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2174f46b5a66SChristoph Hellwig } 2175f46b5a66SChristoph Hellwig 2176f46b5a66SChristoph Hellwig return -ENOTTY; 2177f46b5a66SChristoph Hellwig } 2178