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, 227cb8e7090SChristoph Hellwig char *name, int namelen) 228f46b5a66SChristoph Hellwig { 229f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 230f46b5a66SChristoph Hellwig struct btrfs_key key; 231f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 232f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 233f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23476dda93cSYan, Zheng struct btrfs_root *new_root; 23576dda93cSYan, Zheng struct inode *dir = dentry->d_parent->d_inode; 236f46b5a66SChristoph Hellwig int ret; 237f46b5a66SChristoph Hellwig int err; 238f46b5a66SChristoph Hellwig u64 objectid; 239f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2403de4586cSChris Mason u64 index = 0; 241f46b5a66SChristoph Hellwig 242*a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 243*a22285a6SYan, Zheng 0, &objectid); 244*a22285a6SYan, Zheng if (ret) 245*a22285a6SYan, Zheng return ret; 2469ed74f2dSJosef Bacik /* 2479ed74f2dSJosef Bacik * 1 - inode item 2489ed74f2dSJosef Bacik * 2 - refs 2499ed74f2dSJosef Bacik * 1 - root item 2509ed74f2dSJosef Bacik * 2 - dir items 2519ed74f2dSJosef Bacik */ 252*a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 253*a22285a6SYan, Zheng if (IS_ERR(trans)) 254*a22285a6SYan, Zheng return PTR_ERR(trans); 255f46b5a66SChristoph Hellwig 2565d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2575d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2588e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2598e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2608e8a1e31SJosef Bacik goto fail; 2618e8a1e31SJosef Bacik } 262f46b5a66SChristoph Hellwig 2635d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 264f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 265f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2665d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 267f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 268f46b5a66SChristoph Hellwig 269f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 270f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 271f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2725d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2735d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2745d4f98a2SYan Zheng BTRFS_UUID_SIZE); 275f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 276f46b5a66SChristoph Hellwig 277f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 278f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 279f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 280f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 281f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 282a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 283f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 284f46b5a66SChristoph Hellwig 285f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28684234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 287f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 288f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 28986b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29080ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 291f46b5a66SChristoph Hellwig 292f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 293f46b5a66SChristoph Hellwig root_item.drop_level = 0; 294f46b5a66SChristoph Hellwig 295925baeddSChris Mason btrfs_tree_unlock(leaf); 296f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 297f46b5a66SChristoph Hellwig leaf = NULL; 298f46b5a66SChristoph Hellwig 299f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 300f46b5a66SChristoph Hellwig 301f46b5a66SChristoph Hellwig key.objectid = objectid; 3025d4f98a2SYan Zheng key.offset = 0; 303f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 304f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 305f46b5a66SChristoph Hellwig &root_item); 306f46b5a66SChristoph Hellwig if (ret) 307f46b5a66SChristoph Hellwig goto fail; 308f46b5a66SChristoph Hellwig 30976dda93cSYan, Zheng key.offset = (u64)-1; 31076dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31176dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31276dda93cSYan, Zheng 31376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31476dda93cSYan, Zheng 31576dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 31676dda93cSYan, Zheng BTRFS_I(dir)->block_group); 317f46b5a66SChristoph Hellwig /* 318f46b5a66SChristoph Hellwig * insert the directory item 319f46b5a66SChristoph Hellwig */ 3203de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3213de4586cSChris Mason BUG_ON(ret); 3223de4586cSChris Mason 3233de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 324f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3253de4586cSChris Mason BTRFS_FT_DIR, index); 326f46b5a66SChristoph Hellwig if (ret) 327f46b5a66SChristoph Hellwig goto fail; 3280660b5afSChris Mason 32952c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33052c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33152c26179SYan Zheng BUG_ON(ret); 33252c26179SYan Zheng 3330660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3344df27c4dSYan, Zheng objectid, root->root_key.objectid, 3350660b5afSChris Mason dir->i_ino, index, name, namelen); 33676dda93cSYan, Zheng 3370660b5afSChris Mason BUG_ON(ret); 3380660b5afSChris Mason 33976dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 340f46b5a66SChristoph Hellwig fail: 34176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 342f46b5a66SChristoph Hellwig if (err && !ret) 343f46b5a66SChristoph Hellwig ret = err; 344f46b5a66SChristoph Hellwig return ret; 345f46b5a66SChristoph Hellwig } 346f46b5a66SChristoph Hellwig 347*a22285a6SYan, Zheng static int create_snapshot(struct btrfs_root *root, struct dentry *dentry) 348f46b5a66SChristoph Hellwig { 3492e4bfab9SYan, Zheng struct inode *inode; 350f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 351f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3522e4bfab9SYan, Zheng int ret; 353f46b5a66SChristoph Hellwig 354f46b5a66SChristoph Hellwig if (!root->ref_cows) 355f46b5a66SChristoph Hellwig return -EINVAL; 356f46b5a66SChristoph Hellwig 357*a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 358*a22285a6SYan, Zheng if (!pending_snapshot) 359*a22285a6SYan, Zheng return -ENOMEM; 360*a22285a6SYan, Zheng 361*a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 362*a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 363*a22285a6SYan, Zheng pending_snapshot->root = root; 364*a22285a6SYan, Zheng 365*a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 366*a22285a6SYan, Zheng if (IS_ERR(trans)) { 367*a22285a6SYan, Zheng ret = PTR_ERR(trans); 368*a22285a6SYan, Zheng goto fail; 369*a22285a6SYan, Zheng } 370*a22285a6SYan, Zheng 371*a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 372*a22285a6SYan, Zheng BUG_ON(ret); 373*a22285a6SYan, Zheng 374*a22285a6SYan, Zheng list_add(&pending_snapshot->list, 375*a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 376*a22285a6SYan, Zheng ret = btrfs_commit_transaction(trans, root->fs_info->extent_root); 377*a22285a6SYan, Zheng BUG_ON(ret); 378*a22285a6SYan, Zheng 379*a22285a6SYan, Zheng ret = pending_snapshot->error; 380f46b5a66SChristoph Hellwig if (ret) 3812e4bfab9SYan, Zheng goto fail; 382f46b5a66SChristoph Hellwig 383*a22285a6SYan, Zheng btrfs_orphan_cleanup(pending_snapshot->snap); 384f46b5a66SChristoph Hellwig 3852e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 3862e4bfab9SYan, Zheng if (IS_ERR(inode)) { 3872e4bfab9SYan, Zheng ret = PTR_ERR(inode); 3882e4bfab9SYan, Zheng goto fail; 3892e4bfab9SYan, Zheng } 3902e4bfab9SYan, Zheng BUG_ON(!inode); 3912e4bfab9SYan, Zheng d_instantiate(dentry, inode); 3922e4bfab9SYan, Zheng ret = 0; 3932e4bfab9SYan, Zheng fail: 394*a22285a6SYan, Zheng kfree(pending_snapshot); 395f46b5a66SChristoph Hellwig return ret; 396f46b5a66SChristoph Hellwig } 397f46b5a66SChristoph Hellwig 398cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 399cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 400cb8e7090SChristoph Hellwig { 401cb8e7090SChristoph Hellwig if (child->d_inode) 402cb8e7090SChristoph Hellwig return -EEXIST; 403cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 404cb8e7090SChristoph Hellwig return -ENOENT; 405cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 406cb8e7090SChristoph Hellwig } 407cb8e7090SChristoph Hellwig 408cb8e7090SChristoph Hellwig /* 409cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 410cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 411cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 412cb8e7090SChristoph Hellwig */ 41376dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 41476dda93cSYan, Zheng char *name, int namelen, 4153de4586cSChris Mason struct btrfs_root *snap_src) 416cb8e7090SChristoph Hellwig { 41776dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 418cb8e7090SChristoph Hellwig struct dentry *dentry; 419cb8e7090SChristoph Hellwig int error; 420cb8e7090SChristoph Hellwig 42176dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 422cb8e7090SChristoph Hellwig 423cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 424cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 425cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 426cb8e7090SChristoph Hellwig goto out_unlock; 427cb8e7090SChristoph Hellwig 428cb8e7090SChristoph Hellwig error = -EEXIST; 429cb8e7090SChristoph Hellwig if (dentry->d_inode) 430cb8e7090SChristoph Hellwig goto out_dput; 431cb8e7090SChristoph Hellwig 432cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 433cb8e7090SChristoph Hellwig if (error) 434cb8e7090SChristoph Hellwig goto out_dput; 435cb8e7090SChristoph Hellwig 43676dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 437cb8e7090SChristoph Hellwig if (error) 438cb8e7090SChristoph Hellwig goto out_drop_write; 439cb8e7090SChristoph Hellwig 44076dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 44176dda93cSYan, Zheng 44276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 44376dda93cSYan, Zheng goto out_up_read; 44476dda93cSYan, Zheng 4453de4586cSChris Mason if (snap_src) { 446*a22285a6SYan, Zheng error = create_snapshot(snap_src, dentry); 4473de4586cSChris Mason } else { 44876dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 44976dda93cSYan, Zheng name, namelen); 4503de4586cSChris Mason } 45176dda93cSYan, Zheng if (!error) 45276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 45376dda93cSYan, Zheng out_up_read: 45476dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 455cb8e7090SChristoph Hellwig out_drop_write: 456cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 457cb8e7090SChristoph Hellwig out_dput: 458cb8e7090SChristoph Hellwig dput(dentry); 459cb8e7090SChristoph Hellwig out_unlock: 46076dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 461cb8e7090SChristoph Hellwig return error; 462cb8e7090SChristoph Hellwig } 463cb8e7090SChristoph Hellwig 464940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 4651e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 4661e701a32SChris Mason u64 *defrag_end) 467940100a4SChris Mason { 468940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 469940100a4SChris Mason struct extent_map *em = NULL; 470940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 471940100a4SChris Mason int ret = 1; 472940100a4SChris Mason 4731e701a32SChris Mason 4741e701a32SChris Mason if (thresh == 0) 4751e701a32SChris Mason thresh = 256 * 1024; 4761e701a32SChris Mason 477940100a4SChris Mason /* 478940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 479940100a4SChris Mason * defragging it 480940100a4SChris Mason */ 481940100a4SChris Mason if (start < *defrag_end) 482940100a4SChris Mason return 1; 483940100a4SChris Mason 484940100a4SChris Mason *skip = 0; 485940100a4SChris Mason 486940100a4SChris Mason /* 487940100a4SChris Mason * hopefully we have this extent in the tree already, try without 488940100a4SChris Mason * the full extent lock 489940100a4SChris Mason */ 490940100a4SChris Mason read_lock(&em_tree->lock); 491940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 492940100a4SChris Mason read_unlock(&em_tree->lock); 493940100a4SChris Mason 494940100a4SChris Mason if (!em) { 495940100a4SChris Mason /* get the big lock and read metadata off disk */ 496940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 497940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 498940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 499940100a4SChris Mason 5006cf8bfbfSDan Carpenter if (IS_ERR(em)) 501940100a4SChris Mason return 0; 502940100a4SChris Mason } 503940100a4SChris Mason 504940100a4SChris Mason /* this will cover holes, and inline extents */ 505940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 506940100a4SChris Mason ret = 0; 507940100a4SChris Mason 508940100a4SChris Mason /* 509940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 510940100a4SChris Mason */ 5111e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 512940100a4SChris Mason ret = 0; 513940100a4SChris Mason 514940100a4SChris Mason /* 515940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 516940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 517940100a4SChris Mason * so that the next tiny extent will force a defrag. 518940100a4SChris Mason * 519940100a4SChris Mason * The end result of this is that tiny extents before a single big 520940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 521940100a4SChris Mason */ 522940100a4SChris Mason if (ret) { 523940100a4SChris Mason *last_len += len; 524940100a4SChris Mason *defrag_end = extent_map_end(em); 525940100a4SChris Mason } else { 526940100a4SChris Mason *last_len = 0; 527940100a4SChris Mason *skip = extent_map_end(em); 528940100a4SChris Mason *defrag_end = 0; 529940100a4SChris Mason } 530940100a4SChris Mason 531940100a4SChris Mason free_extent_map(em); 532940100a4SChris Mason return ret; 533940100a4SChris Mason } 534940100a4SChris Mason 5351e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 5361e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 537f46b5a66SChristoph Hellwig { 538f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 539f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 540f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 5413eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 542f46b5a66SChristoph Hellwig struct page *page; 543f46b5a66SChristoph Hellwig unsigned long last_index; 544f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 545f46b5a66SChristoph Hellwig unsigned long total_read = 0; 546f46b5a66SChristoph Hellwig u64 page_start; 547f46b5a66SChristoph Hellwig u64 page_end; 548940100a4SChris Mason u64 last_len = 0; 549940100a4SChris Mason u64 skip = 0; 550940100a4SChris Mason u64 defrag_end = 0; 551f46b5a66SChristoph Hellwig unsigned long i; 552f46b5a66SChristoph Hellwig int ret; 553f46b5a66SChristoph Hellwig 554940100a4SChris Mason if (inode->i_size == 0) 555940100a4SChris Mason return 0; 556f46b5a66SChristoph Hellwig 5571e701a32SChris Mason if (range->start + range->len > range->start) { 5581e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 5591e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 5601e701a32SChris Mason } else { 561940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 5621e701a32SChris Mason } 5631e701a32SChris Mason 5641e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 565940100a4SChris Mason while (i <= last_index) { 566940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 5671e701a32SChris Mason PAGE_CACHE_SIZE, 5681e701a32SChris Mason range->extent_thresh, 5691e701a32SChris Mason &last_len, &skip, 570940100a4SChris Mason &defrag_end)) { 571940100a4SChris Mason unsigned long next; 572940100a4SChris Mason /* 573940100a4SChris Mason * the should_defrag function tells us how much to skip 574940100a4SChris Mason * bump our counter by the suggested amount 575940100a4SChris Mason */ 576940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 577940100a4SChris Mason i = max(i + 1, next); 578940100a4SChris Mason continue; 579940100a4SChris Mason } 580940100a4SChris Mason 581f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 582f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 583f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 584f46b5a66SChristoph Hellwig } 585f46b5a66SChristoph Hellwig total_read++; 586940100a4SChris Mason mutex_lock(&inode->i_mutex); 5871e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 5881e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 589940100a4SChris Mason 590940100a4SChris Mason ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); 591940100a4SChris Mason if (ret) { 592940100a4SChris Mason ret = -ENOSPC; 593940100a4SChris Mason break; 594940100a4SChris Mason } 595940100a4SChris Mason 596940100a4SChris Mason ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); 597940100a4SChris Mason if (ret) { 598940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 599940100a4SChris Mason PAGE_CACHE_SIZE); 600940100a4SChris Mason ret = -ENOSPC; 601940100a4SChris Mason break; 602940100a4SChris Mason } 6033eaa2885SChris Mason again: 604940100a4SChris Mason if (inode->i_size == 0 || 605940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 606940100a4SChris Mason ret = 0; 607940100a4SChris Mason goto err_reservations; 608940100a4SChris Mason } 609940100a4SChris Mason 610f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 611f46b5a66SChristoph Hellwig if (!page) 612940100a4SChris Mason goto err_reservations; 613940100a4SChris Mason 614f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 615f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 616f46b5a66SChristoph Hellwig lock_page(page); 617f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 618f46b5a66SChristoph Hellwig unlock_page(page); 619f46b5a66SChristoph Hellwig page_cache_release(page); 620940100a4SChris Mason goto err_reservations; 621f46b5a66SChristoph Hellwig } 622f46b5a66SChristoph Hellwig } 623f46b5a66SChristoph Hellwig 624940100a4SChris Mason if (page->mapping != inode->i_mapping) { 625940100a4SChris Mason unlock_page(page); 626940100a4SChris Mason page_cache_release(page); 627940100a4SChris Mason goto again; 628940100a4SChris Mason } 629940100a4SChris Mason 630f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 631f46b5a66SChristoph Hellwig 632940100a4SChris Mason if (PageDirty(page)) { 633940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, 634940100a4SChris Mason PAGE_CACHE_SIZE); 635940100a4SChris Mason goto loop_unlock; 636940100a4SChris Mason } 637940100a4SChris Mason 638f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 639f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 640f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 6413eaa2885SChris Mason 6423eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 6433eaa2885SChris Mason if (ordered) { 6443eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 6453eaa2885SChris Mason unlock_page(page); 6463eaa2885SChris Mason page_cache_release(page); 6473eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 6483eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 6493eaa2885SChris Mason goto again; 6503eaa2885SChris Mason } 6513eaa2885SChris Mason set_page_extent_mapped(page); 6523eaa2885SChris Mason 653f87f057bSChris Mason /* 654f87f057bSChris Mason * this makes sure page_mkwrite is called on the 655f87f057bSChris Mason * page if it is dirtied again later 656f87f057bSChris Mason */ 657f87f057bSChris Mason clear_page_dirty_for_io(page); 658940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 659940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 660940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 661f87f057bSChris Mason 6622ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 663940100a4SChris Mason ClearPageChecked(page); 664f46b5a66SChristoph Hellwig set_page_dirty(page); 665a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 666940100a4SChris Mason 667940100a4SChris Mason loop_unlock: 668f46b5a66SChristoph Hellwig unlock_page(page); 669f46b5a66SChristoph Hellwig page_cache_release(page); 670940100a4SChris Mason mutex_unlock(&inode->i_mutex); 671940100a4SChris Mason 672940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 673f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 674940100a4SChris Mason i++; 675f46b5a66SChristoph Hellwig } 676f46b5a66SChristoph Hellwig 6771e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 6781e701a32SChris Mason filemap_flush(inode->i_mapping); 6791e701a32SChris Mason 6801e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 6811e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 6821e701a32SChris Mason * we have to make sure the IO is actually started and that 6831e701a32SChris Mason * ordered extents get created before we return 6841e701a32SChris Mason */ 6851e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 6861e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 6871e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 6881e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 6891e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 6901e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 6911e701a32SChris Mason } 6921e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 6931e701a32SChris Mason 6941e701a32SChris Mason mutex_lock(&inode->i_mutex); 6951e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 6961e701a32SChris Mason mutex_unlock(&inode->i_mutex); 6971e701a32SChris Mason } 6981e701a32SChris Mason 699f46b5a66SChristoph Hellwig return 0; 700940100a4SChris Mason 701940100a4SChris Mason err_reservations: 702940100a4SChris Mason mutex_unlock(&inode->i_mutex); 703940100a4SChris Mason btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); 704940100a4SChris Mason btrfs_unreserve_metadata_for_delalloc(root, inode, 1); 705940100a4SChris Mason return ret; 706f46b5a66SChristoph Hellwig } 707f46b5a66SChristoph Hellwig 70876dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 70976dda93cSYan, Zheng void __user *arg) 710f46b5a66SChristoph Hellwig { 711f46b5a66SChristoph Hellwig u64 new_size; 712f46b5a66SChristoph Hellwig u64 old_size; 713f46b5a66SChristoph Hellwig u64 devid = 1; 714f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 715f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 716f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 717f46b5a66SChristoph Hellwig char *sizestr; 718f46b5a66SChristoph Hellwig char *devstr = NULL; 719f46b5a66SChristoph Hellwig int ret = 0; 720f46b5a66SChristoph Hellwig int namelen; 721f46b5a66SChristoph Hellwig int mod = 0; 722f46b5a66SChristoph Hellwig 723c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 724c146afadSYan Zheng return -EROFS; 725c146afadSYan Zheng 726e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 727e441d54dSChris Mason return -EPERM; 728e441d54dSChris Mason 729dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 730dae7b665SLi Zefan if (IS_ERR(vol_args)) 731dae7b665SLi Zefan return PTR_ERR(vol_args); 7325516e595SMark Fasheh 7335516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 734f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 735f46b5a66SChristoph Hellwig 7367d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 737f46b5a66SChristoph Hellwig sizestr = vol_args->name; 738f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 739f46b5a66SChristoph Hellwig if (devstr) { 740f46b5a66SChristoph Hellwig char *end; 741f46b5a66SChristoph Hellwig sizestr = devstr + 1; 742f46b5a66SChristoph Hellwig *devstr = '\0'; 743f46b5a66SChristoph Hellwig devstr = vol_args->name; 744f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 74521380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 74621380931SJoel Becker (unsigned long long)devid); 747f46b5a66SChristoph Hellwig } 7482b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 749f46b5a66SChristoph Hellwig if (!device) { 75021380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 75121380931SJoel Becker (unsigned long long)devid); 752f46b5a66SChristoph Hellwig ret = -EINVAL; 753f46b5a66SChristoph Hellwig goto out_unlock; 754f46b5a66SChristoph Hellwig } 755f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 756f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 757f46b5a66SChristoph Hellwig else { 758f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 759f46b5a66SChristoph Hellwig mod = -1; 760f46b5a66SChristoph Hellwig sizestr++; 761f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 762f46b5a66SChristoph Hellwig mod = 1; 763f46b5a66SChristoph Hellwig sizestr++; 764f46b5a66SChristoph Hellwig } 76591748467SAkinobu Mita new_size = memparse(sizestr, NULL); 766f46b5a66SChristoph Hellwig if (new_size == 0) { 767f46b5a66SChristoph Hellwig ret = -EINVAL; 768f46b5a66SChristoph Hellwig goto out_unlock; 769f46b5a66SChristoph Hellwig } 770f46b5a66SChristoph Hellwig } 771f46b5a66SChristoph Hellwig 772f46b5a66SChristoph Hellwig old_size = device->total_bytes; 773f46b5a66SChristoph Hellwig 774f46b5a66SChristoph Hellwig if (mod < 0) { 775f46b5a66SChristoph Hellwig if (new_size > old_size) { 776f46b5a66SChristoph Hellwig ret = -EINVAL; 777f46b5a66SChristoph Hellwig goto out_unlock; 778f46b5a66SChristoph Hellwig } 779f46b5a66SChristoph Hellwig new_size = old_size - new_size; 780f46b5a66SChristoph Hellwig } else if (mod > 0) { 781f46b5a66SChristoph Hellwig new_size = old_size + new_size; 782f46b5a66SChristoph Hellwig } 783f46b5a66SChristoph Hellwig 784f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 785f46b5a66SChristoph Hellwig ret = -EINVAL; 786f46b5a66SChristoph Hellwig goto out_unlock; 787f46b5a66SChristoph Hellwig } 788f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 789f46b5a66SChristoph Hellwig ret = -EFBIG; 790f46b5a66SChristoph Hellwig goto out_unlock; 791f46b5a66SChristoph Hellwig } 792f46b5a66SChristoph Hellwig 793f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 794f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 795f46b5a66SChristoph Hellwig 796f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 797f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 798f46b5a66SChristoph Hellwig 799f46b5a66SChristoph Hellwig if (new_size > old_size) { 800*a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 801f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 802f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 803f46b5a66SChristoph Hellwig } else { 804f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 805f46b5a66SChristoph Hellwig } 806f46b5a66SChristoph Hellwig 807f46b5a66SChristoph Hellwig out_unlock: 8087d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 809f46b5a66SChristoph Hellwig kfree(vol_args); 810f46b5a66SChristoph Hellwig return ret; 811f46b5a66SChristoph Hellwig } 812f46b5a66SChristoph Hellwig 813cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 8143de4586cSChris Mason void __user *arg, int subvol) 815f46b5a66SChristoph Hellwig { 816cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 817f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 8183de4586cSChris Mason struct file *src_file; 819f46b5a66SChristoph Hellwig int namelen; 8203de4586cSChris Mason int ret = 0; 821f46b5a66SChristoph Hellwig 822c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 823c146afadSYan Zheng return -EROFS; 824c146afadSYan Zheng 825dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 826dae7b665SLi Zefan if (IS_ERR(vol_args)) 827dae7b665SLi Zefan return PTR_ERR(vol_args); 828f46b5a66SChristoph Hellwig 8295516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 830f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 831f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 832f46b5a66SChristoph Hellwig ret = -EINVAL; 833f46b5a66SChristoph Hellwig goto out; 834f46b5a66SChristoph Hellwig } 835f46b5a66SChristoph Hellwig 8363de4586cSChris Mason if (subvol) { 83776dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 83876dda93cSYan, Zheng NULL); 839cb8e7090SChristoph Hellwig } else { 8403de4586cSChris Mason struct inode *src_inode; 8413de4586cSChris Mason src_file = fget(vol_args->fd); 8423de4586cSChris Mason if (!src_file) { 8433de4586cSChris Mason ret = -EINVAL; 8443de4586cSChris Mason goto out; 8453de4586cSChris Mason } 8463de4586cSChris Mason 8473de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 8483de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 849d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 850d397712bSChris Mason "another FS\n"); 8513de4586cSChris Mason ret = -EINVAL; 8523de4586cSChris Mason fput(src_file); 8533de4586cSChris Mason goto out; 8543de4586cSChris Mason } 85576dda93cSYan, Zheng ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, 85676dda93cSYan, Zheng BTRFS_I(src_inode)->root); 8573de4586cSChris Mason fput(src_file); 858cb8e7090SChristoph Hellwig } 859f46b5a66SChristoph Hellwig out: 860f46b5a66SChristoph Hellwig kfree(vol_args); 861f46b5a66SChristoph Hellwig return ret; 862f46b5a66SChristoph Hellwig } 863f46b5a66SChristoph Hellwig 86476dda93cSYan, Zheng /* 86576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 86676dda93cSYan, Zheng */ 86776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 86876dda93cSYan, Zheng { 86976dda93cSYan, Zheng struct btrfs_path *path; 87076dda93cSYan, Zheng struct btrfs_key key; 87176dda93cSYan, Zheng int ret; 87276dda93cSYan, Zheng 87376dda93cSYan, Zheng path = btrfs_alloc_path(); 87476dda93cSYan, Zheng if (!path) 87576dda93cSYan, Zheng return -ENOMEM; 87676dda93cSYan, Zheng 87776dda93cSYan, Zheng key.objectid = root->root_key.objectid; 87876dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 87976dda93cSYan, Zheng key.offset = (u64)-1; 88076dda93cSYan, Zheng 88176dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 88276dda93cSYan, Zheng &key, path, 0, 0); 88376dda93cSYan, Zheng if (ret < 0) 88476dda93cSYan, Zheng goto out; 88576dda93cSYan, Zheng BUG_ON(ret == 0); 88676dda93cSYan, Zheng 88776dda93cSYan, Zheng ret = 0; 88876dda93cSYan, Zheng if (path->slots[0] > 0) { 88976dda93cSYan, Zheng path->slots[0]--; 89076dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 89176dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 89276dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 89376dda93cSYan, Zheng ret = -ENOTEMPTY; 89476dda93cSYan, Zheng } 89576dda93cSYan, Zheng out: 89676dda93cSYan, Zheng btrfs_free_path(path); 89776dda93cSYan, Zheng return ret; 89876dda93cSYan, Zheng } 89976dda93cSYan, Zheng 900ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 901ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 902ac8e9819SChris Mason { 903abc6e134SChris Mason struct btrfs_key test; 904abc6e134SChris Mason int ret; 905abc6e134SChris Mason 906abc6e134SChris Mason test.objectid = sk->min_objectid; 907abc6e134SChris Mason test.type = sk->min_type; 908abc6e134SChris Mason test.offset = sk->min_offset; 909abc6e134SChris Mason 910abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 911abc6e134SChris Mason if (ret < 0) 912ac8e9819SChris Mason return 0; 913abc6e134SChris Mason 914abc6e134SChris Mason test.objectid = sk->max_objectid; 915abc6e134SChris Mason test.type = sk->max_type; 916abc6e134SChris Mason test.offset = sk->max_offset; 917abc6e134SChris Mason 918abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 919abc6e134SChris Mason if (ret > 0) 920ac8e9819SChris Mason return 0; 921ac8e9819SChris Mason return 1; 922ac8e9819SChris Mason } 923ac8e9819SChris Mason 924ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 925ac8e9819SChris Mason struct btrfs_path *path, 926ac8e9819SChris Mason struct btrfs_key *key, 927ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 928ac8e9819SChris Mason char *buf, 929ac8e9819SChris Mason unsigned long *sk_offset, 930ac8e9819SChris Mason int *num_found) 931ac8e9819SChris Mason { 932ac8e9819SChris Mason u64 found_transid; 933ac8e9819SChris Mason struct extent_buffer *leaf; 934ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 935ac8e9819SChris Mason unsigned long item_off; 936ac8e9819SChris Mason unsigned long item_len; 937ac8e9819SChris Mason int nritems; 938ac8e9819SChris Mason int i; 939ac8e9819SChris Mason int slot; 940ac8e9819SChris Mason int found = 0; 941ac8e9819SChris Mason int ret = 0; 942ac8e9819SChris Mason 943ac8e9819SChris Mason leaf = path->nodes[0]; 944ac8e9819SChris Mason slot = path->slots[0]; 945ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 946ac8e9819SChris Mason 947ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 948ac8e9819SChris Mason i = nritems; 949ac8e9819SChris Mason goto advance_key; 950ac8e9819SChris Mason } 951ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 952ac8e9819SChris Mason 953ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 954ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 955ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 956ac8e9819SChris Mason 957ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 958ac8e9819SChris Mason item_len = 0; 959ac8e9819SChris Mason 960ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 961ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 962ac8e9819SChris Mason ret = 1; 963ac8e9819SChris Mason goto overflow; 964ac8e9819SChris Mason } 965ac8e9819SChris Mason 966ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 967ac8e9819SChris Mason if (!key_in_sk(key, sk)) 968ac8e9819SChris Mason continue; 969ac8e9819SChris Mason 970ac8e9819SChris Mason sh.objectid = key->objectid; 971ac8e9819SChris Mason sh.offset = key->offset; 972ac8e9819SChris Mason sh.type = key->type; 973ac8e9819SChris Mason sh.len = item_len; 974ac8e9819SChris Mason sh.transid = found_transid; 975ac8e9819SChris Mason 976ac8e9819SChris Mason /* copy search result header */ 977ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 978ac8e9819SChris Mason *sk_offset += sizeof(sh); 979ac8e9819SChris Mason 980ac8e9819SChris Mason if (item_len) { 981ac8e9819SChris Mason char *p = buf + *sk_offset; 982ac8e9819SChris Mason /* copy the item */ 983ac8e9819SChris Mason read_extent_buffer(leaf, p, 984ac8e9819SChris Mason item_off, item_len); 985ac8e9819SChris Mason *sk_offset += item_len; 986ac8e9819SChris Mason } 98790fdde14SChris Mason found++; 988ac8e9819SChris Mason 989ac8e9819SChris Mason if (*num_found >= sk->nr_items) 990ac8e9819SChris Mason break; 991ac8e9819SChris Mason } 992ac8e9819SChris Mason advance_key: 993ac8e9819SChris Mason ret = 0; 994abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 995abc6e134SChris Mason key->offset++; 996abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 997abc6e134SChris Mason key->offset = 0; 998abc6e134SChris Mason key->type++; 999abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1000abc6e134SChris Mason key->offset = 0; 1001abc6e134SChris Mason key->type = 0; 1002abc6e134SChris Mason key->objectid++; 1003abc6e134SChris Mason } else 1004abc6e134SChris Mason ret = 1; 1005ac8e9819SChris Mason overflow: 1006ac8e9819SChris Mason *num_found += found; 1007ac8e9819SChris Mason return ret; 1008ac8e9819SChris Mason } 1009ac8e9819SChris Mason 1010ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1011ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1012ac8e9819SChris Mason { 1013ac8e9819SChris Mason struct btrfs_root *root; 1014ac8e9819SChris Mason struct btrfs_key key; 1015ac8e9819SChris Mason struct btrfs_key max_key; 1016ac8e9819SChris Mason struct btrfs_path *path; 1017ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1018ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1019ac8e9819SChris Mason int ret; 1020ac8e9819SChris Mason int num_found = 0; 1021ac8e9819SChris Mason unsigned long sk_offset = 0; 1022ac8e9819SChris Mason 1023ac8e9819SChris Mason path = btrfs_alloc_path(); 1024ac8e9819SChris Mason if (!path) 1025ac8e9819SChris Mason return -ENOMEM; 1026ac8e9819SChris Mason 1027ac8e9819SChris Mason if (sk->tree_id == 0) { 1028ac8e9819SChris Mason /* search the root of the inode that was passed */ 1029ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1030ac8e9819SChris Mason } else { 1031ac8e9819SChris Mason key.objectid = sk->tree_id; 1032ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1033ac8e9819SChris Mason key.offset = (u64)-1; 1034ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1035ac8e9819SChris Mason if (IS_ERR(root)) { 1036ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1037ac8e9819SChris Mason sk->tree_id); 1038ac8e9819SChris Mason btrfs_free_path(path); 1039ac8e9819SChris Mason return -ENOENT; 1040ac8e9819SChris Mason } 1041ac8e9819SChris Mason } 1042ac8e9819SChris Mason 1043ac8e9819SChris Mason key.objectid = sk->min_objectid; 1044ac8e9819SChris Mason key.type = sk->min_type; 1045ac8e9819SChris Mason key.offset = sk->min_offset; 1046ac8e9819SChris Mason 1047ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1048ac8e9819SChris Mason max_key.type = sk->max_type; 1049ac8e9819SChris Mason max_key.offset = sk->max_offset; 1050ac8e9819SChris Mason 1051ac8e9819SChris Mason path->keep_locks = 1; 1052ac8e9819SChris Mason 1053ac8e9819SChris Mason while(1) { 1054ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1055ac8e9819SChris Mason sk->min_transid); 1056ac8e9819SChris Mason if (ret != 0) { 1057ac8e9819SChris Mason if (ret > 0) 1058ac8e9819SChris Mason ret = 0; 1059ac8e9819SChris Mason goto err; 1060ac8e9819SChris Mason } 1061ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1062ac8e9819SChris Mason &sk_offset, &num_found); 1063ac8e9819SChris Mason btrfs_release_path(root, path); 1064ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1065ac8e9819SChris Mason break; 1066ac8e9819SChris Mason 1067ac8e9819SChris Mason } 1068ac8e9819SChris Mason ret = 0; 1069ac8e9819SChris Mason err: 1070ac8e9819SChris Mason sk->nr_items = num_found; 1071ac8e9819SChris Mason btrfs_free_path(path); 1072ac8e9819SChris Mason return ret; 1073ac8e9819SChris Mason } 1074ac8e9819SChris Mason 1075ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1076ac8e9819SChris Mason void __user *argp) 1077ac8e9819SChris Mason { 1078ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1079ac8e9819SChris Mason struct inode *inode; 1080ac8e9819SChris Mason int ret; 1081ac8e9819SChris Mason 1082ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1083ac8e9819SChris Mason return -EPERM; 1084ac8e9819SChris Mason 1085ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1086ac8e9819SChris Mason if (!args) 1087ac8e9819SChris Mason return -ENOMEM; 1088ac8e9819SChris Mason 1089ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1090ac8e9819SChris Mason kfree(args); 1091ac8e9819SChris Mason return -EFAULT; 1092ac8e9819SChris Mason } 1093ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1094ac8e9819SChris Mason ret = search_ioctl(inode, args); 1095ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1096ac8e9819SChris Mason ret = -EFAULT; 1097ac8e9819SChris Mason kfree(args); 1098ac8e9819SChris Mason return ret; 1099ac8e9819SChris Mason } 1100ac8e9819SChris Mason 110198d377a0STARUISI Hiroaki /* 1102ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1103ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 110498d377a0STARUISI Hiroaki */ 110598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 110698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 110798d377a0STARUISI Hiroaki { 110898d377a0STARUISI Hiroaki struct btrfs_root *root; 110998d377a0STARUISI Hiroaki struct btrfs_key key; 1110ac8e9819SChris Mason char *ptr; 111198d377a0STARUISI Hiroaki int ret = -1; 111298d377a0STARUISI Hiroaki int slot; 111398d377a0STARUISI Hiroaki int len; 111498d377a0STARUISI Hiroaki int total_len = 0; 111598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 111698d377a0STARUISI Hiroaki struct extent_buffer *l; 111798d377a0STARUISI Hiroaki struct btrfs_path *path; 111898d377a0STARUISI Hiroaki 111998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 112098d377a0STARUISI Hiroaki name[0]='\0'; 112198d377a0STARUISI Hiroaki return 0; 112298d377a0STARUISI Hiroaki } 112398d377a0STARUISI Hiroaki 112498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 112598d377a0STARUISI Hiroaki if (!path) 112698d377a0STARUISI Hiroaki return -ENOMEM; 112798d377a0STARUISI Hiroaki 1128ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 112998d377a0STARUISI Hiroaki 113098d377a0STARUISI Hiroaki key.objectid = tree_id; 113198d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 113298d377a0STARUISI Hiroaki key.offset = (u64)-1; 113398d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 113498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 113598d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 11368ad6fcabSChris Mason ret = -ENOENT; 11378ad6fcabSChris Mason goto out; 113898d377a0STARUISI Hiroaki } 113998d377a0STARUISI Hiroaki 114098d377a0STARUISI Hiroaki key.objectid = dirid; 114198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 11428ad6fcabSChris Mason key.offset = (u64)-1; 114398d377a0STARUISI Hiroaki 114498d377a0STARUISI Hiroaki while(1) { 114598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 114698d377a0STARUISI Hiroaki if (ret < 0) 114798d377a0STARUISI Hiroaki goto out; 114898d377a0STARUISI Hiroaki 114998d377a0STARUISI Hiroaki l = path->nodes[0]; 115098d377a0STARUISI Hiroaki slot = path->slots[0]; 11518ad6fcabSChris Mason if (ret > 0 && slot > 0) 11528ad6fcabSChris Mason slot--; 115398d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 115498d377a0STARUISI Hiroaki 115598d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1156ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1157ac8e9819SChris Mason ret = -ENOENT; 115898d377a0STARUISI Hiroaki goto out; 1159ac8e9819SChris Mason } 116098d377a0STARUISI Hiroaki 116198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 116298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 116398d377a0STARUISI Hiroaki ptr -= len + 1; 116498d377a0STARUISI Hiroaki total_len += len + 1; 1165ac8e9819SChris Mason if (ptr < name) 116698d377a0STARUISI Hiroaki goto out; 116798d377a0STARUISI Hiroaki 116898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 116998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 117098d377a0STARUISI Hiroaki 117198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 117298d377a0STARUISI Hiroaki break; 117398d377a0STARUISI Hiroaki 117498d377a0STARUISI Hiroaki btrfs_release_path(root, path); 117598d377a0STARUISI Hiroaki key.objectid = key.offset; 11768ad6fcabSChris Mason key.offset = (u64)-1; 117798d377a0STARUISI Hiroaki dirid = key.objectid; 117898d377a0STARUISI Hiroaki 117998d377a0STARUISI Hiroaki } 1180ac8e9819SChris Mason if (ptr < name) 118198d377a0STARUISI Hiroaki goto out; 1182ac8e9819SChris Mason memcpy(name, ptr, total_len); 118398d377a0STARUISI Hiroaki name[total_len]='\0'; 118498d377a0STARUISI Hiroaki ret = 0; 118598d377a0STARUISI Hiroaki out: 118698d377a0STARUISI Hiroaki btrfs_free_path(path); 1187ac8e9819SChris Mason return ret; 1188ac8e9819SChris Mason } 1189ac8e9819SChris Mason 1190ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1191ac8e9819SChris Mason void __user *argp) 1192ac8e9819SChris Mason { 1193ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1194ac8e9819SChris Mason struct inode *inode; 1195ac8e9819SChris Mason int ret; 1196ac8e9819SChris Mason 1197ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1198ac8e9819SChris Mason return -EPERM; 1199ac8e9819SChris Mason 1200ac8e9819SChris Mason args = kmalloc(sizeof(*args), GFP_KERNEL); 1201c2b96929SDan Carpenter if (!args) 1202c2b96929SDan Carpenter return -ENOMEM; 1203c2b96929SDan Carpenter 1204ac8e9819SChris Mason if (copy_from_user(args, argp, sizeof(*args))) { 1205ac8e9819SChris Mason kfree(args); 1206ac8e9819SChris Mason return -EFAULT; 1207ac8e9819SChris Mason } 1208ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1209ac8e9819SChris Mason 12101b53ac4dSChris Mason if (args->treeid == 0) 12111b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 12121b53ac4dSChris Mason 1213ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1214ac8e9819SChris Mason args->treeid, args->objectid, 1215ac8e9819SChris Mason args->name); 1216ac8e9819SChris Mason 1217ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1218ac8e9819SChris Mason ret = -EFAULT; 1219ac8e9819SChris Mason 1220ac8e9819SChris Mason kfree(args); 122198d377a0STARUISI Hiroaki return ret; 122298d377a0STARUISI Hiroaki } 122398d377a0STARUISI Hiroaki 122476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 122576dda93cSYan, Zheng void __user *arg) 122676dda93cSYan, Zheng { 122776dda93cSYan, Zheng struct dentry *parent = fdentry(file); 122876dda93cSYan, Zheng struct dentry *dentry; 122976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 123076dda93cSYan, Zheng struct inode *inode; 123176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 123276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 123376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 123476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 123576dda93cSYan, Zheng int namelen; 123676dda93cSYan, Zheng int ret; 123776dda93cSYan, Zheng int err = 0; 123876dda93cSYan, Zheng 123976dda93cSYan, Zheng if (!capable(CAP_SYS_ADMIN)) 124076dda93cSYan, Zheng return -EPERM; 124176dda93cSYan, Zheng 124276dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 124376dda93cSYan, Zheng if (IS_ERR(vol_args)) 124476dda93cSYan, Zheng return PTR_ERR(vol_args); 124576dda93cSYan, Zheng 124676dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 124776dda93cSYan, Zheng namelen = strlen(vol_args->name); 124876dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 124976dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 125076dda93cSYan, Zheng err = -EINVAL; 125176dda93cSYan, Zheng goto out; 125276dda93cSYan, Zheng } 125376dda93cSYan, Zheng 125476dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 125576dda93cSYan, Zheng if (err) 125676dda93cSYan, Zheng goto out; 125776dda93cSYan, Zheng 125876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 125976dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 126076dda93cSYan, Zheng if (IS_ERR(dentry)) { 126176dda93cSYan, Zheng err = PTR_ERR(dentry); 126276dda93cSYan, Zheng goto out_unlock_dir; 126376dda93cSYan, Zheng } 126476dda93cSYan, Zheng 126576dda93cSYan, Zheng if (!dentry->d_inode) { 126676dda93cSYan, Zheng err = -ENOENT; 126776dda93cSYan, Zheng goto out_dput; 126876dda93cSYan, Zheng } 126976dda93cSYan, Zheng 127076dda93cSYan, Zheng inode = dentry->d_inode; 127176dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 127276dda93cSYan, Zheng err = -EINVAL; 127376dda93cSYan, Zheng goto out_dput; 127476dda93cSYan, Zheng } 127576dda93cSYan, Zheng 127676dda93cSYan, Zheng dest = BTRFS_I(inode)->root; 127776dda93cSYan, Zheng 127876dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 127976dda93cSYan, Zheng err = d_invalidate(dentry); 128076dda93cSYan, Zheng if (err) 128176dda93cSYan, Zheng goto out_unlock; 128276dda93cSYan, Zheng 128376dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 128476dda93cSYan, Zheng 128576dda93cSYan, Zheng err = may_destroy_subvol(dest); 128676dda93cSYan, Zheng if (err) 128776dda93cSYan, Zheng goto out_up_write; 128876dda93cSYan, Zheng 1289*a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1290*a22285a6SYan, Zheng if (IS_ERR(trans)) { 1291*a22285a6SYan, Zheng err = PTR_ERR(trans); 1292*a22285a6SYan, Zheng goto out; 1293*a22285a6SYan, Zheng } 1294*a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1295*a22285a6SYan, Zheng 129676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 129776dda93cSYan, Zheng dest->root_key.objectid, 129876dda93cSYan, Zheng dentry->d_name.name, 129976dda93cSYan, Zheng dentry->d_name.len); 130076dda93cSYan, Zheng BUG_ON(ret); 130176dda93cSYan, Zheng 130276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 130376dda93cSYan, Zheng 130476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 130576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 130676dda93cSYan, Zheng dest->root_item.drop_level = 0; 130776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 130876dda93cSYan, Zheng 130976dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 131076dda93cSYan, Zheng root->fs_info->tree_root, 131176dda93cSYan, Zheng dest->root_key.objectid); 131276dda93cSYan, Zheng BUG_ON(ret); 131376dda93cSYan, Zheng 131476dda93cSYan, Zheng ret = btrfs_commit_transaction(trans, root); 131576dda93cSYan, Zheng BUG_ON(ret); 131676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 131776dda93cSYan, Zheng out_up_write: 131876dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 131976dda93cSYan, Zheng out_unlock: 132076dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 132176dda93cSYan, Zheng if (!err) { 1322efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 132376dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 132476dda93cSYan, Zheng d_delete(dentry); 132576dda93cSYan, Zheng } 132676dda93cSYan, Zheng out_dput: 132776dda93cSYan, Zheng dput(dentry); 132876dda93cSYan, Zheng out_unlock_dir: 132976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 133076dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 133176dda93cSYan, Zheng out: 133276dda93cSYan, Zheng kfree(vol_args); 133376dda93cSYan, Zheng return err; 133476dda93cSYan, Zheng } 133576dda93cSYan, Zheng 13361e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1337f46b5a66SChristoph Hellwig { 1338f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1339f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 13401e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1341c146afadSYan Zheng int ret; 1342c146afadSYan Zheng 1343c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1344c146afadSYan Zheng if (ret) 1345c146afadSYan Zheng return ret; 1346f46b5a66SChristoph Hellwig 1347f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1348f46b5a66SChristoph Hellwig case S_IFDIR: 1349e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1350e441d54dSChris Mason ret = -EPERM; 1351e441d54dSChris Mason goto out; 1352e441d54dSChris Mason } 1353f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 1354f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 1355f46b5a66SChristoph Hellwig break; 1356f46b5a66SChristoph Hellwig case S_IFREG: 1357e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1358e441d54dSChris Mason ret = -EINVAL; 1359e441d54dSChris Mason goto out; 1360e441d54dSChris Mason } 13611e701a32SChris Mason 13621e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 13631e701a32SChris Mason if (!range) { 13641e701a32SChris Mason ret = -ENOMEM; 13651e701a32SChris Mason goto out; 13661e701a32SChris Mason } 13671e701a32SChris Mason 13681e701a32SChris Mason if (argp) { 13691e701a32SChris Mason if (copy_from_user(range, argp, 13701e701a32SChris Mason sizeof(*range))) { 13711e701a32SChris Mason ret = -EFAULT; 13721e701a32SChris Mason kfree(range); 1373683be16eSDan Carpenter goto out; 13741e701a32SChris Mason } 13751e701a32SChris Mason /* compression requires us to start the IO */ 13761e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13771e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 13781e701a32SChris Mason range->extent_thresh = (u32)-1; 13791e701a32SChris Mason } 13801e701a32SChris Mason } else { 13811e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 13821e701a32SChris Mason range->len = (u64)-1; 13831e701a32SChris Mason } 13841e701a32SChris Mason btrfs_defrag_file(file, range); 13851e701a32SChris Mason kfree(range); 1386f46b5a66SChristoph Hellwig break; 1387f46b5a66SChristoph Hellwig } 1388e441d54dSChris Mason out: 1389ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1390e441d54dSChris Mason return ret; 1391f46b5a66SChristoph Hellwig } 1392f46b5a66SChristoph Hellwig 1393b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1394f46b5a66SChristoph Hellwig { 1395f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1396f46b5a66SChristoph Hellwig int ret; 1397f46b5a66SChristoph Hellwig 1398e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1399e441d54dSChris Mason return -EPERM; 1400e441d54dSChris Mason 1401dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1402dae7b665SLi Zefan if (IS_ERR(vol_args)) 1403dae7b665SLi Zefan return PTR_ERR(vol_args); 1404f46b5a66SChristoph Hellwig 14055516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1406f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1407f46b5a66SChristoph Hellwig 1408f46b5a66SChristoph Hellwig kfree(vol_args); 1409f46b5a66SChristoph Hellwig return ret; 1410f46b5a66SChristoph Hellwig } 1411f46b5a66SChristoph Hellwig 1412b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1413f46b5a66SChristoph Hellwig { 1414f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1415f46b5a66SChristoph Hellwig int ret; 1416f46b5a66SChristoph Hellwig 1417e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1418e441d54dSChris Mason return -EPERM; 1419e441d54dSChris Mason 1420c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1421c146afadSYan Zheng return -EROFS; 1422c146afadSYan Zheng 1423dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1424dae7b665SLi Zefan if (IS_ERR(vol_args)) 1425dae7b665SLi Zefan return PTR_ERR(vol_args); 1426f46b5a66SChristoph Hellwig 14275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1428f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1429f46b5a66SChristoph Hellwig 1430f46b5a66SChristoph Hellwig kfree(vol_args); 1431f46b5a66SChristoph Hellwig return ret; 1432f46b5a66SChristoph Hellwig } 1433f46b5a66SChristoph Hellwig 143476dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1435b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1436f46b5a66SChristoph Hellwig { 1437f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1438f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1439f46b5a66SChristoph Hellwig struct file *src_file; 1440f46b5a66SChristoph Hellwig struct inode *src; 1441f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1442f46b5a66SChristoph Hellwig struct btrfs_path *path; 1443f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1444ae01a0abSYan Zheng char *buf; 1445ae01a0abSYan Zheng struct btrfs_key key; 1446f46b5a66SChristoph Hellwig u32 nritems; 1447f46b5a66SChristoph Hellwig int slot; 1448ae01a0abSYan Zheng int ret; 1449c5c9cd4dSSage Weil u64 len = olen; 1450c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1451c5c9cd4dSSage Weil u64 hint_byte; 1452d20f7043SChris Mason 1453c5c9cd4dSSage Weil /* 1454c5c9cd4dSSage Weil * TODO: 1455c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1456c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1457c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1458c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1459c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1460c5c9cd4dSSage Weil * they don't overlap)? 1461c5c9cd4dSSage Weil */ 1462c5c9cd4dSSage Weil 1463e441d54dSChris Mason /* the destination must be opened for writing */ 1464e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 1465e441d54dSChris Mason return -EINVAL; 1466e441d54dSChris Mason 1467c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1468c146afadSYan Zheng if (ret) 1469c146afadSYan Zheng return ret; 1470c146afadSYan Zheng 1471c5c9cd4dSSage Weil src_file = fget(srcfd); 1472ab67b7c1SYan Zheng if (!src_file) { 1473ab67b7c1SYan Zheng ret = -EBADF; 1474ab67b7c1SYan Zheng goto out_drop_write; 1475ab67b7c1SYan Zheng } 14765dc64164SDan Rosenberg 1477f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1478f46b5a66SChristoph Hellwig 1479c5c9cd4dSSage Weil ret = -EINVAL; 1480c5c9cd4dSSage Weil if (src == inode) 1481c5c9cd4dSSage Weil goto out_fput; 1482c5c9cd4dSSage Weil 14835dc64164SDan Rosenberg /* the src must be open for reading */ 14845dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 14855dc64164SDan Rosenberg goto out_fput; 14865dc64164SDan Rosenberg 1487ae01a0abSYan Zheng ret = -EISDIR; 1488ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1489f46b5a66SChristoph Hellwig goto out_fput; 1490f46b5a66SChristoph Hellwig 1491ae01a0abSYan Zheng ret = -EXDEV; 1492ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1493ae01a0abSYan Zheng goto out_fput; 1494ae01a0abSYan Zheng 1495ae01a0abSYan Zheng ret = -ENOMEM; 1496ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1497ae01a0abSYan Zheng if (!buf) 1498ae01a0abSYan Zheng goto out_fput; 1499ae01a0abSYan Zheng 1500ae01a0abSYan Zheng path = btrfs_alloc_path(); 1501ae01a0abSYan Zheng if (!path) { 1502ae01a0abSYan Zheng vfree(buf); 1503ae01a0abSYan Zheng goto out_fput; 1504ae01a0abSYan Zheng } 1505ae01a0abSYan Zheng path->reada = 2; 1506ae01a0abSYan Zheng 1507f46b5a66SChristoph Hellwig if (inode < src) { 1508f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1509f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1510f46b5a66SChristoph Hellwig } else { 1511f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 1512f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 1513f46b5a66SChristoph Hellwig } 1514f46b5a66SChristoph Hellwig 1515c5c9cd4dSSage Weil /* determine range to clone */ 1516c5c9cd4dSSage Weil ret = -EINVAL; 1517c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 1518f46b5a66SChristoph Hellwig goto out_unlock; 1519c5c9cd4dSSage Weil if (len == 0) 1520c5c9cd4dSSage Weil olen = len = src->i_size - off; 1521c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1522c5c9cd4dSSage Weil if (off + len == src->i_size) 1523c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1524c5c9cd4dSSage Weil - off; 1525c5c9cd4dSSage Weil 1526c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1527c5c9cd4dSSage Weil if ((off & (bs-1)) || 1528c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1529c5c9cd4dSSage Weil goto out_unlock; 1530c5c9cd4dSSage Weil 1531f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1532f46b5a66SChristoph Hellwig another, and lock file content */ 1533f46b5a66SChristoph Hellwig while (1) { 153431840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1535c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1536c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 1537ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 1538f46b5a66SChristoph Hellwig break; 1539c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1540ae01a0abSYan Zheng if (ordered) 1541ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 1542c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 1543f46b5a66SChristoph Hellwig } 1544f46b5a66SChristoph Hellwig 1545c5c9cd4dSSage Weil /* clone data */ 1546f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1547ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1548ae01a0abSYan Zheng key.offset = 0; 1549f46b5a66SChristoph Hellwig 1550f46b5a66SChristoph Hellwig while (1) { 1551f46b5a66SChristoph Hellwig /* 1552f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1553f46b5a66SChristoph Hellwig * tree. 1554f46b5a66SChristoph Hellwig */ 1555*a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1556f46b5a66SChristoph Hellwig if (ret < 0) 1557f46b5a66SChristoph Hellwig goto out; 1558f46b5a66SChristoph Hellwig 1559ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1560ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1561f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1562f46b5a66SChristoph Hellwig if (ret < 0) 1563f46b5a66SChristoph Hellwig goto out; 1564f46b5a66SChristoph Hellwig if (ret > 0) 1565f46b5a66SChristoph Hellwig break; 1566ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1567f46b5a66SChristoph Hellwig } 1568f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1569f46b5a66SChristoph Hellwig slot = path->slots[0]; 1570f46b5a66SChristoph Hellwig 1571ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1572d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1573f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1574f46b5a66SChristoph Hellwig break; 1575f46b5a66SChristoph Hellwig 1576c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1577c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1578c5c9cd4dSSage Weil int type; 157931840ae1SZheng Yan u32 size; 158031840ae1SZheng Yan struct btrfs_key new_key; 1581c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1582c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1583c5c9cd4dSSage Weil u8 comp; 158431840ae1SZheng Yan 158531840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 158631840ae1SZheng Yan read_extent_buffer(leaf, buf, 158731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 158831840ae1SZheng Yan size); 1589c5c9cd4dSSage Weil 1590c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1591c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1592c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1593c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1594c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1595c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1596d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1597d397712bSChris Mason extent); 1598d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1599d397712bSChris Mason extent); 1600c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1601d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1602d397712bSChris Mason extent); 1603c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1604c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1605c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1606c5c9cd4dSSage Weil extent); 1607c5c9cd4dSSage Weil } 160831840ae1SZheng Yan btrfs_release_path(root, path); 160931840ae1SZheng Yan 1610c5c9cd4dSSage Weil if (key.offset + datal < off || 1611c5c9cd4dSSage Weil key.offset >= off+len) 1612c5c9cd4dSSage Weil goto next; 1613c5c9cd4dSSage Weil 161431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 161531840ae1SZheng Yan new_key.objectid = inode->i_ino; 1616c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1617c5c9cd4dSSage Weil 1618*a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1619*a22285a6SYan, Zheng if (IS_ERR(trans)) { 1620*a22285a6SYan, Zheng ret = PTR_ERR(trans); 1621*a22285a6SYan, Zheng goto out; 1622*a22285a6SYan, Zheng } 1623*a22285a6SYan, Zheng 1624c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1625c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1626*a22285a6SYan, Zheng if (off > key.offset) { 1627*a22285a6SYan, Zheng datao += off - key.offset; 1628*a22285a6SYan, Zheng datal -= off - key.offset; 1629*a22285a6SYan, Zheng } 1630*a22285a6SYan, Zheng 1631*a22285a6SYan, Zheng if (key.offset + datal > off + len) 1632*a22285a6SYan, Zheng datal = off + len - key.offset; 1633*a22285a6SYan, Zheng 1634*a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1635*a22285a6SYan, Zheng new_key.offset, 1636*a22285a6SYan, Zheng new_key.offset + datal, 1637*a22285a6SYan, Zheng &hint_byte, 1); 1638*a22285a6SYan, Zheng BUG_ON(ret); 1639*a22285a6SYan, Zheng 164031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 164131840ae1SZheng Yan &new_key, size); 1642*a22285a6SYan, Zheng BUG_ON(ret); 164331840ae1SZheng Yan 164431840ae1SZheng Yan leaf = path->nodes[0]; 164531840ae1SZheng Yan slot = path->slots[0]; 164631840ae1SZheng Yan write_extent_buffer(leaf, buf, 164731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 164831840ae1SZheng Yan size); 1649ae01a0abSYan Zheng 1650f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1651f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1652c5c9cd4dSSage Weil 1653c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1654c5c9cd4dSSage Weil if (!disko) 1655c5c9cd4dSSage Weil datao = 0; 1656c5c9cd4dSSage Weil 1657c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1658c5c9cd4dSSage Weil datao); 1659c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1660c5c9cd4dSSage Weil datal); 1661c5c9cd4dSSage Weil if (disko) { 1662c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1663ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 16645d4f98a2SYan Zheng disko, diskl, 0, 1665f46b5a66SChristoph Hellwig root->root_key.objectid, 16665d4f98a2SYan Zheng inode->i_ino, 16675d4f98a2SYan Zheng new_key.offset - datao); 1668ae01a0abSYan Zheng BUG_ON(ret); 1669f46b5a66SChristoph Hellwig } 1670c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1671c5c9cd4dSSage Weil u64 skip = 0; 1672c5c9cd4dSSage Weil u64 trim = 0; 1673c5c9cd4dSSage Weil if (off > key.offset) { 1674c5c9cd4dSSage Weil skip = off - key.offset; 1675c5c9cd4dSSage Weil new_key.offset += skip; 167631840ae1SZheng Yan } 1677d397712bSChris Mason 1678c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1679c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1680d397712bSChris Mason 1681c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1682c5c9cd4dSSage Weil ret = -EINVAL; 1683*a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1684c5c9cd4dSSage Weil goto out; 168531840ae1SZheng Yan } 1686c5c9cd4dSSage Weil size -= skip + trim; 1687c5c9cd4dSSage Weil datal -= skip + trim; 1688*a22285a6SYan, Zheng 1689*a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1690*a22285a6SYan, Zheng new_key.offset, 1691*a22285a6SYan, Zheng new_key.offset + datal, 1692*a22285a6SYan, Zheng &hint_byte, 1); 1693*a22285a6SYan, Zheng BUG_ON(ret); 1694*a22285a6SYan, Zheng 1695c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1696c5c9cd4dSSage Weil &new_key, size); 1697*a22285a6SYan, Zheng BUG_ON(ret); 1698c5c9cd4dSSage Weil 1699c5c9cd4dSSage Weil if (skip) { 1700d397712bSChris Mason u32 start = 1701d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1702c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1703c5c9cd4dSSage Weil datal); 1704c5c9cd4dSSage Weil } 1705c5c9cd4dSSage Weil 1706c5c9cd4dSSage Weil leaf = path->nodes[0]; 1707c5c9cd4dSSage Weil slot = path->slots[0]; 1708c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1709c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1710c5c9cd4dSSage Weil size); 1711c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1712c5c9cd4dSSage Weil } 1713c5c9cd4dSSage Weil 1714c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1715*a22285a6SYan, Zheng btrfs_release_path(root, path); 1716c5c9cd4dSSage Weil 1717*a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1718*a22285a6SYan, Zheng if (new_key.offset + datal > inode->i_size) 1719*a22285a6SYan, Zheng btrfs_i_size_write(inode, 1720*a22285a6SYan, Zheng new_key.offset + datal); 1721*a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1722*a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 1723*a22285a6SYan, Zheng BUG_ON(ret); 1724*a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1725*a22285a6SYan, Zheng } 1726c5c9cd4dSSage Weil next: 172731840ae1SZheng Yan btrfs_release_path(root, path); 1728ae01a0abSYan Zheng key.offset++; 1729ae01a0abSYan Zheng } 1730f46b5a66SChristoph Hellwig ret = 0; 1731f46b5a66SChristoph Hellwig out: 1732ae01a0abSYan Zheng btrfs_release_path(root, path); 1733c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1734f46b5a66SChristoph Hellwig out_unlock: 1735f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1736f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1737ae01a0abSYan Zheng vfree(buf); 1738ae01a0abSYan Zheng btrfs_free_path(path); 1739f46b5a66SChristoph Hellwig out_fput: 1740f46b5a66SChristoph Hellwig fput(src_file); 1741ab67b7c1SYan Zheng out_drop_write: 1742ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1743f46b5a66SChristoph Hellwig return ret; 1744f46b5a66SChristoph Hellwig } 1745f46b5a66SChristoph Hellwig 17467a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1747c5c9cd4dSSage Weil { 1748c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1749c5c9cd4dSSage Weil 17507a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1751c5c9cd4dSSage Weil return -EFAULT; 1752c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1753c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1754c5c9cd4dSSage Weil } 1755c5c9cd4dSSage Weil 1756f46b5a66SChristoph Hellwig /* 1757f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1758f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1759f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1760f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1761f46b5a66SChristoph Hellwig */ 1762b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1763f46b5a66SChristoph Hellwig { 1764f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1765f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1766f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 17671ab86aedSSage Weil int ret; 1768f46b5a66SChristoph Hellwig 17691ab86aedSSage Weil ret = -EPERM; 1770df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1771f46b5a66SChristoph Hellwig goto out; 17721ab86aedSSage Weil 17731ab86aedSSage Weil ret = -EINPROGRESS; 17741ab86aedSSage Weil if (file->private_data) 17751ab86aedSSage Weil goto out; 17769ca9ee09SSage Weil 1777c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1778c146afadSYan Zheng if (ret) 1779c146afadSYan Zheng goto out; 1780c146afadSYan Zheng 17819ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 17829ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 17839ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17849ca9ee09SSage Weil 1785f46b5a66SChristoph Hellwig ret = -ENOMEM; 17861ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 17871ab86aedSSage Weil if (!trans) 17881ab86aedSSage Weil goto out_drop; 17891ab86aedSSage Weil 17901ab86aedSSage Weil file->private_data = trans; 17911ab86aedSSage Weil return 0; 17921ab86aedSSage Weil 17931ab86aedSSage Weil out_drop: 17941ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 17951ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 17961ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 17971ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1798f46b5a66SChristoph Hellwig out: 1799f46b5a66SChristoph Hellwig return ret; 1800f46b5a66SChristoph Hellwig } 1801f46b5a66SChristoph Hellwig 18026ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 18036ef5ed0dSJosef Bacik { 18046ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 18056ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 18066ef5ed0dSJosef Bacik struct btrfs_root *new_root; 18076ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 18086ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 18096ef5ed0dSJosef Bacik struct btrfs_path *path; 18106ef5ed0dSJosef Bacik struct btrfs_key location; 18116ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 18126ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 18136ef5ed0dSJosef Bacik u64 features; 18146ef5ed0dSJosef Bacik u64 objectid = 0; 18156ef5ed0dSJosef Bacik u64 dir_id; 18166ef5ed0dSJosef Bacik 18176ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 18186ef5ed0dSJosef Bacik return -EPERM; 18196ef5ed0dSJosef Bacik 18206ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 18216ef5ed0dSJosef Bacik return -EFAULT; 18226ef5ed0dSJosef Bacik 18236ef5ed0dSJosef Bacik if (!objectid) 18246ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 18256ef5ed0dSJosef Bacik 18266ef5ed0dSJosef Bacik location.objectid = objectid; 18276ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 18286ef5ed0dSJosef Bacik location.offset = (u64)-1; 18296ef5ed0dSJosef Bacik 18306ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 18316ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 18326ef5ed0dSJosef Bacik return PTR_ERR(new_root); 18336ef5ed0dSJosef Bacik 18346ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 18356ef5ed0dSJosef Bacik return -ENOENT; 18366ef5ed0dSJosef Bacik 18376ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 18386ef5ed0dSJosef Bacik if (!path) 18396ef5ed0dSJosef Bacik return -ENOMEM; 18406ef5ed0dSJosef Bacik path->leave_spinning = 1; 18416ef5ed0dSJosef Bacik 18426ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 18436ef5ed0dSJosef Bacik if (!trans) { 18446ef5ed0dSJosef Bacik btrfs_free_path(path); 18456ef5ed0dSJosef Bacik return -ENOMEM; 18466ef5ed0dSJosef Bacik } 18476ef5ed0dSJosef Bacik 18486ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 18496ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 18506ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 18516ef5ed0dSJosef Bacik if (!di) { 18526ef5ed0dSJosef Bacik btrfs_free_path(path); 18536ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18546ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 18556ef5ed0dSJosef Bacik "this isn't going to work\n"); 18566ef5ed0dSJosef Bacik return -ENOENT; 18576ef5ed0dSJosef Bacik } 18586ef5ed0dSJosef Bacik 18596ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 18606ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 18616ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 18626ef5ed0dSJosef Bacik btrfs_free_path(path); 18636ef5ed0dSJosef Bacik 18646ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 18656ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 18666ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 18676ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 18686ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 18696ef5ed0dSJosef Bacik } 18706ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 18716ef5ed0dSJosef Bacik 18726ef5ed0dSJosef Bacik return 0; 18736ef5ed0dSJosef Bacik } 18746ef5ed0dSJosef Bacik 18751406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 18761406e432SJosef Bacik { 18771406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 18781406e432SJosef Bacik struct btrfs_ioctl_space_info space; 18791406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 18807fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 18817fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 18821406e432SJosef Bacik struct btrfs_space_info *info; 18837fde62bfSChris Mason int alloc_size; 18841406e432SJosef Bacik int ret = 0; 18857fde62bfSChris Mason int slot_count = 0; 18861406e432SJosef Bacik 18871406e432SJosef Bacik if (copy_from_user(&space_args, 18881406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 18891406e432SJosef Bacik sizeof(space_args))) 18901406e432SJosef Bacik return -EFAULT; 18911406e432SJosef Bacik 18927fde62bfSChris Mason /* first we count slots */ 18937fde62bfSChris Mason rcu_read_lock(); 18947fde62bfSChris Mason list_for_each_entry_rcu(info, &root->fs_info->space_info, list) 18957fde62bfSChris Mason slot_count++; 18967fde62bfSChris Mason rcu_read_unlock(); 18971406e432SJosef Bacik 18987fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 18997fde62bfSChris Mason if (space_args.space_slots == 0) { 19007fde62bfSChris Mason space_args.total_spaces = slot_count; 19017fde62bfSChris Mason goto out; 19027fde62bfSChris Mason } 19037fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 19047fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 19057fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 19067fde62bfSChris Mason */ 19077fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 19087fde62bfSChris Mason return -ENOMEM; 19097fde62bfSChris Mason 19107fde62bfSChris Mason space_args.total_spaces = 0; 19117fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 19127fde62bfSChris Mason if (!dest) 19137fde62bfSChris Mason return -ENOMEM; 19147fde62bfSChris Mason dest_orig = dest; 19157fde62bfSChris Mason 19167fde62bfSChris Mason /* now we have a buffer to copy into */ 19171406e432SJosef Bacik rcu_read_lock(); 19181406e432SJosef Bacik list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { 19197fde62bfSChris Mason /* make sure we don't copy more than we allocated 19207fde62bfSChris Mason * in our buffer 19217fde62bfSChris Mason */ 19227fde62bfSChris Mason if (slot_count == 0) 19237fde62bfSChris Mason break; 19247fde62bfSChris Mason slot_count--; 19257fde62bfSChris Mason 19267fde62bfSChris Mason /* make sure userland has enough room in their buffer */ 19271406e432SJosef Bacik if (space_args.total_spaces >= space_args.space_slots) 19281406e432SJosef Bacik break; 19297fde62bfSChris Mason 19301406e432SJosef Bacik space.flags = info->flags; 19311406e432SJosef Bacik space.total_bytes = info->total_bytes; 19321406e432SJosef Bacik space.used_bytes = info->bytes_used; 19337fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 19341406e432SJosef Bacik dest++; 19351406e432SJosef Bacik space_args.total_spaces++; 19361406e432SJosef Bacik } 19371406e432SJosef Bacik rcu_read_unlock(); 19381406e432SJosef Bacik 19397fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 19407fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 19417fde62bfSChris Mason 19427fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 19437fde62bfSChris Mason ret = -EFAULT; 19447fde62bfSChris Mason 19457fde62bfSChris Mason kfree(dest_orig); 19467fde62bfSChris Mason out: 19477fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 19481406e432SJosef Bacik ret = -EFAULT; 19491406e432SJosef Bacik 19501406e432SJosef Bacik return ret; 19511406e432SJosef Bacik } 19521406e432SJosef Bacik 1953f46b5a66SChristoph Hellwig /* 1954f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1955f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1956f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1957f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1958f46b5a66SChristoph Hellwig */ 1959f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1960f46b5a66SChristoph Hellwig { 1961f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1962f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1963f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1964f46b5a66SChristoph Hellwig 1965f46b5a66SChristoph Hellwig trans = file->private_data; 19661ab86aedSSage Weil if (!trans) 19671ab86aedSSage Weil return -EINVAL; 1968b214107eSChristoph Hellwig file->private_data = NULL; 19699ca9ee09SSage Weil 19701ab86aedSSage Weil btrfs_end_transaction(trans, root); 19711ab86aedSSage Weil 19729ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19739ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 19749ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19759ca9ee09SSage Weil 1976cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 19771ab86aedSSage Weil return 0; 1978f46b5a66SChristoph Hellwig } 1979f46b5a66SChristoph Hellwig 1980f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1981f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1982f46b5a66SChristoph Hellwig { 1983f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 19844bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1985f46b5a66SChristoph Hellwig 1986f46b5a66SChristoph Hellwig switch (cmd) { 19876cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 19886cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 19896cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 19906cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 19916cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 19926cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 1993f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 19944bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 19953de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 19964bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 199776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 199876dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 19996ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 20006ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2001f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 20021e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 20031e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 20041e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2005f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 20064bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2007f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 20084bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2009f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 20104bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2011f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2012f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2013f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2014c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2015c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 20167a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2017f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2018f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2019f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2020f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2021ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2022ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2023ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2024ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 20251406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 20261406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2027f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2028f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2029f46b5a66SChristoph Hellwig return 0; 2030f46b5a66SChristoph Hellwig } 2031f46b5a66SChristoph Hellwig 2032f46b5a66SChristoph Hellwig return -ENOTTY; 2033f46b5a66SChristoph Hellwig } 2034