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 150b83cc969SLi Zefan if (btrfs_root_readonly(root)) 151b83cc969SLi Zefan return -EROFS; 152b83cc969SLi Zefan 1536cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1546cbff00fSChristoph Hellwig return -EFAULT; 1556cbff00fSChristoph Hellwig 1566cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1576cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1586cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1596cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1626cbff00fSChristoph Hellwig return -EACCES; 1636cbff00fSChristoph Hellwig 1646cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1656cbff00fSChristoph Hellwig 1666cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1676cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1686cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1696cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1706cbff00fSChristoph Hellwig ret = -EPERM; 1716cbff00fSChristoph Hellwig goto out_unlock; 1726cbff00fSChristoph Hellwig } 1736cbff00fSChristoph Hellwig } 1746cbff00fSChristoph Hellwig 1756cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1766cbff00fSChristoph Hellwig if (ret) 1776cbff00fSChristoph Hellwig goto out_unlock; 1786cbff00fSChristoph Hellwig 1796cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1806cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1816cbff00fSChristoph Hellwig else 1826cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1836cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1846cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1856cbff00fSChristoph Hellwig else 1866cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1876cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1886cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1896cbff00fSChristoph Hellwig else 1906cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1916cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1926cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1936cbff00fSChristoph Hellwig else 1946cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1956cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1966cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1976cbff00fSChristoph Hellwig else 1986cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1996cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2006cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2016cbff00fSChristoph Hellwig else 2026cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2036cbff00fSChristoph Hellwig 2046cbff00fSChristoph Hellwig 2056cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2066cbff00fSChristoph Hellwig BUG_ON(!trans); 2076cbff00fSChristoph Hellwig 2086cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2096cbff00fSChristoph Hellwig BUG_ON(ret); 2106cbff00fSChristoph Hellwig 2116cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2126cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2136cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2146cbff00fSChristoph Hellwig 2156cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2166cbff00fSChristoph Hellwig out_unlock: 2176cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2186cbff00fSChristoph Hellwig return 0; 2196cbff00fSChristoph Hellwig } 2206cbff00fSChristoph Hellwig 2216cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2226cbff00fSChristoph Hellwig { 2236cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2246cbff00fSChristoph Hellwig 2256cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2266cbff00fSChristoph Hellwig } 227f46b5a66SChristoph Hellwig 228cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 229cb8e7090SChristoph Hellwig struct dentry *dentry, 23072fd032eSSage Weil char *name, int namelen, 23172fd032eSSage Weil u64 *async_transid) 232f46b5a66SChristoph Hellwig { 233f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 234f46b5a66SChristoph Hellwig struct btrfs_key key; 235f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 236f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 237f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23876dda93cSYan, Zheng struct btrfs_root *new_root; 2396a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 2406a912213SJosef Bacik struct inode *dir; 241f46b5a66SChristoph Hellwig int ret; 242f46b5a66SChristoph Hellwig int err; 243f46b5a66SChristoph Hellwig u64 objectid; 244f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2453de4586cSChris Mason u64 index = 0; 246f46b5a66SChristoph Hellwig 247a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 248a22285a6SYan, Zheng 0, &objectid); 2496a912213SJosef Bacik if (ret) { 2506a912213SJosef Bacik dput(parent); 251a22285a6SYan, Zheng return ret; 2526a912213SJosef Bacik } 2536a912213SJosef Bacik 2546a912213SJosef Bacik dir = parent->d_inode; 2556a912213SJosef Bacik 2569ed74f2dSJosef Bacik /* 2579ed74f2dSJosef Bacik * 1 - inode item 2589ed74f2dSJosef Bacik * 2 - refs 2599ed74f2dSJosef Bacik * 1 - root item 2609ed74f2dSJosef Bacik * 2 - dir items 2619ed74f2dSJosef Bacik */ 262a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 2636a912213SJosef Bacik if (IS_ERR(trans)) { 2646a912213SJosef Bacik dput(parent); 265a22285a6SYan, Zheng return PTR_ERR(trans); 2666a912213SJosef Bacik } 267f46b5a66SChristoph Hellwig 2685d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2695d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2708e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2718e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2728e8a1e31SJosef Bacik goto fail; 2738e8a1e31SJosef Bacik } 274f46b5a66SChristoph Hellwig 2755d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 276f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 277f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2785d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 279f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 280f46b5a66SChristoph Hellwig 281f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 282f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 283f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2845d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2855d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2865d4f98a2SYan Zheng BTRFS_UUID_SIZE); 287f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 288f46b5a66SChristoph Hellwig 289f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 290f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 291f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 292f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 293f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 294a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 295f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 296f46b5a66SChristoph Hellwig 297f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 29884234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 299f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 300f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 30186b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 30280ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 303f46b5a66SChristoph Hellwig 304f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 305f46b5a66SChristoph Hellwig root_item.drop_level = 0; 306f46b5a66SChristoph Hellwig 307925baeddSChris Mason btrfs_tree_unlock(leaf); 308f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 309f46b5a66SChristoph Hellwig leaf = NULL; 310f46b5a66SChristoph Hellwig 311f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 312f46b5a66SChristoph Hellwig 313f46b5a66SChristoph Hellwig key.objectid = objectid; 3145d4f98a2SYan Zheng key.offset = 0; 315f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 316f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 317f46b5a66SChristoph Hellwig &root_item); 318f46b5a66SChristoph Hellwig if (ret) 319f46b5a66SChristoph Hellwig goto fail; 320f46b5a66SChristoph Hellwig 32176dda93cSYan, Zheng key.offset = (u64)-1; 32276dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 32376dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 32476dda93cSYan, Zheng 32576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 32676dda93cSYan, Zheng 32776dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 32876dda93cSYan, Zheng BTRFS_I(dir)->block_group); 329f46b5a66SChristoph Hellwig /* 330f46b5a66SChristoph Hellwig * insert the directory item 331f46b5a66SChristoph Hellwig */ 3323de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3333de4586cSChris Mason BUG_ON(ret); 3343de4586cSChris Mason 3353de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 336f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3373de4586cSChris Mason BTRFS_FT_DIR, index); 338f46b5a66SChristoph Hellwig if (ret) 339f46b5a66SChristoph Hellwig goto fail; 3400660b5afSChris Mason 34152c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 34252c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 34352c26179SYan Zheng BUG_ON(ret); 34452c26179SYan Zheng 3450660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3464df27c4dSYan, Zheng objectid, root->root_key.objectid, 3470660b5afSChris Mason dir->i_ino, index, name, namelen); 34876dda93cSYan, Zheng 3490660b5afSChris Mason BUG_ON(ret); 3500660b5afSChris Mason 35176dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 352f46b5a66SChristoph Hellwig fail: 3536a912213SJosef Bacik dput(parent); 35472fd032eSSage Weil if (async_transid) { 35572fd032eSSage Weil *async_transid = trans->transid; 35672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 35772fd032eSSage Weil } else { 35876dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 35972fd032eSSage Weil } 360f46b5a66SChristoph Hellwig if (err && !ret) 361f46b5a66SChristoph Hellwig ret = err; 362f46b5a66SChristoph Hellwig return ret; 363f46b5a66SChristoph Hellwig } 364f46b5a66SChristoph Hellwig 36572fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 366b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 367b83cc969SLi Zefan bool readonly) 368f46b5a66SChristoph Hellwig { 3692e4bfab9SYan, Zheng struct inode *inode; 3706a912213SJosef Bacik struct dentry *parent; 371f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 372f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3732e4bfab9SYan, Zheng int ret; 374f46b5a66SChristoph Hellwig 375f46b5a66SChristoph Hellwig if (!root->ref_cows) 376f46b5a66SChristoph Hellwig return -EINVAL; 377f46b5a66SChristoph Hellwig 378a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 379a22285a6SYan, Zheng if (!pending_snapshot) 380a22285a6SYan, Zheng return -ENOMEM; 381a22285a6SYan, Zheng 382a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 383a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 384a22285a6SYan, Zheng pending_snapshot->root = root; 385b83cc969SLi Zefan pending_snapshot->readonly = readonly; 386a22285a6SYan, Zheng 387a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 388a22285a6SYan, Zheng if (IS_ERR(trans)) { 389a22285a6SYan, Zheng ret = PTR_ERR(trans); 390a22285a6SYan, Zheng goto fail; 391a22285a6SYan, Zheng } 392a22285a6SYan, Zheng 393a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 394a22285a6SYan, Zheng BUG_ON(ret); 395a22285a6SYan, Zheng 396a22285a6SYan, Zheng list_add(&pending_snapshot->list, 397a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 39872fd032eSSage Weil if (async_transid) { 39972fd032eSSage Weil *async_transid = trans->transid; 40072fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 40172fd032eSSage Weil root->fs_info->extent_root, 1); 40272fd032eSSage Weil } else { 40372fd032eSSage Weil ret = btrfs_commit_transaction(trans, 40472fd032eSSage Weil root->fs_info->extent_root); 40572fd032eSSage Weil } 406a22285a6SYan, Zheng BUG_ON(ret); 407a22285a6SYan, Zheng 408a22285a6SYan, Zheng ret = pending_snapshot->error; 409f46b5a66SChristoph Hellwig if (ret) 4102e4bfab9SYan, Zheng goto fail; 411f46b5a66SChristoph Hellwig 412a22285a6SYan, Zheng btrfs_orphan_cleanup(pending_snapshot->snap); 413f46b5a66SChristoph Hellwig 4146a912213SJosef Bacik parent = dget_parent(dentry); 4156a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 4166a912213SJosef Bacik dput(parent); 4172e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4182e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4192e4bfab9SYan, Zheng goto fail; 4202e4bfab9SYan, Zheng } 4212e4bfab9SYan, Zheng BUG_ON(!inode); 4222e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4232e4bfab9SYan, Zheng ret = 0; 4242e4bfab9SYan, Zheng fail: 425a22285a6SYan, Zheng kfree(pending_snapshot); 426f46b5a66SChristoph Hellwig return ret; 427f46b5a66SChristoph Hellwig } 428f46b5a66SChristoph Hellwig 4294260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 4304260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 4314260f7c7SSage Weil * minimal. 4324260f7c7SSage Weil */ 4334260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 4344260f7c7SSage Weil { 4354260f7c7SSage Weil uid_t fsuid = current_fsuid(); 4364260f7c7SSage Weil 4374260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 4384260f7c7SSage Weil return 0; 4394260f7c7SSage Weil if (inode->i_uid == fsuid) 4404260f7c7SSage Weil return 0; 4414260f7c7SSage Weil if (dir->i_uid == fsuid) 4424260f7c7SSage Weil return 0; 4434260f7c7SSage Weil return !capable(CAP_FOWNER); 4444260f7c7SSage Weil } 4454260f7c7SSage Weil 4464260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 4474260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 4484260f7c7SSage Weil * whether the type of victim is right. 4494260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 4504260f7c7SSage Weil * 2. We should have write and exec permissions on dir 4514260f7c7SSage Weil * 3. We can't remove anything from append-only dir 4524260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 4534260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 4544260f7c7SSage Weil * a. be owner of dir, or 4554260f7c7SSage Weil * b. be owner of victim, or 4564260f7c7SSage Weil * c. have CAP_FOWNER capability 4574260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 4584260f7c7SSage Weil * links pointing to it. 4594260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 4604260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 4614260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 4624260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 4634260f7c7SSage Weil * nfs_async_unlink(). 4644260f7c7SSage Weil */ 4654260f7c7SSage Weil 4664260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 4674260f7c7SSage Weil { 4684260f7c7SSage Weil int error; 4694260f7c7SSage Weil 4704260f7c7SSage Weil if (!victim->d_inode) 4714260f7c7SSage Weil return -ENOENT; 4724260f7c7SSage Weil 4734260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 4744260f7c7SSage Weil audit_inode_child(victim, dir); 4754260f7c7SSage Weil 4764260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 4774260f7c7SSage Weil if (error) 4784260f7c7SSage Weil return error; 4794260f7c7SSage Weil if (IS_APPEND(dir)) 4804260f7c7SSage Weil return -EPERM; 4814260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 4824260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 4834260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 4844260f7c7SSage Weil return -EPERM; 4854260f7c7SSage Weil if (isdir) { 4864260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 4874260f7c7SSage Weil return -ENOTDIR; 4884260f7c7SSage Weil if (IS_ROOT(victim)) 4894260f7c7SSage Weil return -EBUSY; 4904260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 4914260f7c7SSage Weil return -EISDIR; 4924260f7c7SSage Weil if (IS_DEADDIR(dir)) 4934260f7c7SSage Weil return -ENOENT; 4944260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 4954260f7c7SSage Weil return -EBUSY; 4964260f7c7SSage Weil return 0; 4974260f7c7SSage Weil } 4984260f7c7SSage Weil 499cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 500cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 501cb8e7090SChristoph Hellwig { 502cb8e7090SChristoph Hellwig if (child->d_inode) 503cb8e7090SChristoph Hellwig return -EEXIST; 504cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 505cb8e7090SChristoph Hellwig return -ENOENT; 506cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 507cb8e7090SChristoph Hellwig } 508cb8e7090SChristoph Hellwig 509cb8e7090SChristoph Hellwig /* 510cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 511cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 512cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 513cb8e7090SChristoph Hellwig */ 51476dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 51576dda93cSYan, Zheng char *name, int namelen, 51672fd032eSSage Weil struct btrfs_root *snap_src, 517b83cc969SLi Zefan u64 *async_transid, bool readonly) 518cb8e7090SChristoph Hellwig { 51976dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 520cb8e7090SChristoph Hellwig struct dentry *dentry; 521cb8e7090SChristoph Hellwig int error; 522cb8e7090SChristoph Hellwig 52376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 524cb8e7090SChristoph Hellwig 525cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 526cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 527cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 528cb8e7090SChristoph Hellwig goto out_unlock; 529cb8e7090SChristoph Hellwig 530cb8e7090SChristoph Hellwig error = -EEXIST; 531cb8e7090SChristoph Hellwig if (dentry->d_inode) 532cb8e7090SChristoph Hellwig goto out_dput; 533cb8e7090SChristoph Hellwig 534cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 535cb8e7090SChristoph Hellwig if (error) 536cb8e7090SChristoph Hellwig goto out_dput; 537cb8e7090SChristoph Hellwig 53876dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 539cb8e7090SChristoph Hellwig if (error) 540cb8e7090SChristoph Hellwig goto out_drop_write; 541cb8e7090SChristoph Hellwig 54276dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 54376dda93cSYan, Zheng 54476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 54576dda93cSYan, Zheng goto out_up_read; 54676dda93cSYan, Zheng 5473de4586cSChris Mason if (snap_src) { 54872fd032eSSage Weil error = create_snapshot(snap_src, dentry, 549b83cc969SLi Zefan name, namelen, async_transid, readonly); 5503de4586cSChris Mason } else { 55176dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 55272fd032eSSage Weil name, namelen, async_transid); 5533de4586cSChris Mason } 55476dda93cSYan, Zheng if (!error) 55576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 55676dda93cSYan, Zheng out_up_read: 55776dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 558cb8e7090SChristoph Hellwig out_drop_write: 559cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 560cb8e7090SChristoph Hellwig out_dput: 561cb8e7090SChristoph Hellwig dput(dentry); 562cb8e7090SChristoph Hellwig out_unlock: 56376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 564cb8e7090SChristoph Hellwig return error; 565cb8e7090SChristoph Hellwig } 566cb8e7090SChristoph Hellwig 567940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 5681e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 5691e701a32SChris Mason u64 *defrag_end) 570940100a4SChris Mason { 571940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 572940100a4SChris Mason struct extent_map *em = NULL; 573940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 574940100a4SChris Mason int ret = 1; 575940100a4SChris Mason 5761e701a32SChris Mason 5771e701a32SChris Mason if (thresh == 0) 5781e701a32SChris Mason thresh = 256 * 1024; 5791e701a32SChris Mason 580940100a4SChris Mason /* 581940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 582940100a4SChris Mason * defragging it 583940100a4SChris Mason */ 584940100a4SChris Mason if (start < *defrag_end) 585940100a4SChris Mason return 1; 586940100a4SChris Mason 587940100a4SChris Mason *skip = 0; 588940100a4SChris Mason 589940100a4SChris Mason /* 590940100a4SChris Mason * hopefully we have this extent in the tree already, try without 591940100a4SChris Mason * the full extent lock 592940100a4SChris Mason */ 593940100a4SChris Mason read_lock(&em_tree->lock); 594940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 595940100a4SChris Mason read_unlock(&em_tree->lock); 596940100a4SChris Mason 597940100a4SChris Mason if (!em) { 598940100a4SChris Mason /* get the big lock and read metadata off disk */ 599940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 600940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 601940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 602940100a4SChris Mason 6036cf8bfbfSDan Carpenter if (IS_ERR(em)) 604940100a4SChris Mason return 0; 605940100a4SChris Mason } 606940100a4SChris Mason 607940100a4SChris Mason /* this will cover holes, and inline extents */ 608940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 609940100a4SChris Mason ret = 0; 610940100a4SChris Mason 611940100a4SChris Mason /* 612940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 613940100a4SChris Mason */ 6141e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 615940100a4SChris Mason ret = 0; 616940100a4SChris Mason 617940100a4SChris Mason /* 618940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 619940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 620940100a4SChris Mason * so that the next tiny extent will force a defrag. 621940100a4SChris Mason * 622940100a4SChris Mason * The end result of this is that tiny extents before a single big 623940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 624940100a4SChris Mason */ 625940100a4SChris Mason if (ret) { 626940100a4SChris Mason *last_len += len; 627940100a4SChris Mason *defrag_end = extent_map_end(em); 628940100a4SChris Mason } else { 629940100a4SChris Mason *last_len = 0; 630940100a4SChris Mason *skip = extent_map_end(em); 631940100a4SChris Mason *defrag_end = 0; 632940100a4SChris Mason } 633940100a4SChris Mason 634940100a4SChris Mason free_extent_map(em); 635940100a4SChris Mason return ret; 636940100a4SChris Mason } 637940100a4SChris Mason 6381e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 6391e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 640f46b5a66SChristoph Hellwig { 641f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 642f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 643f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6443eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 645f46b5a66SChristoph Hellwig struct page *page; 646f46b5a66SChristoph Hellwig unsigned long last_index; 647f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 648f46b5a66SChristoph Hellwig unsigned long total_read = 0; 649f46b5a66SChristoph Hellwig u64 page_start; 650f46b5a66SChristoph Hellwig u64 page_end; 651940100a4SChris Mason u64 last_len = 0; 652940100a4SChris Mason u64 skip = 0; 653940100a4SChris Mason u64 defrag_end = 0; 654f46b5a66SChristoph Hellwig unsigned long i; 655f46b5a66SChristoph Hellwig int ret; 656f46b5a66SChristoph Hellwig 657940100a4SChris Mason if (inode->i_size == 0) 658940100a4SChris Mason return 0; 659f46b5a66SChristoph Hellwig 6601e701a32SChris Mason if (range->start + range->len > range->start) { 6611e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 6621e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 6631e701a32SChris Mason } else { 664940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 6651e701a32SChris Mason } 6661e701a32SChris Mason 6671e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 668940100a4SChris Mason while (i <= last_index) { 669940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 6701e701a32SChris Mason PAGE_CACHE_SIZE, 6711e701a32SChris Mason range->extent_thresh, 6721e701a32SChris Mason &last_len, &skip, 673940100a4SChris Mason &defrag_end)) { 674940100a4SChris Mason unsigned long next; 675940100a4SChris Mason /* 676940100a4SChris Mason * the should_defrag function tells us how much to skip 677940100a4SChris Mason * bump our counter by the suggested amount 678940100a4SChris Mason */ 679940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 680940100a4SChris Mason i = max(i + 1, next); 681940100a4SChris Mason continue; 682940100a4SChris Mason } 683940100a4SChris Mason 684f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 685f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 686f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 687f46b5a66SChristoph Hellwig } 688f46b5a66SChristoph Hellwig total_read++; 689940100a4SChris Mason mutex_lock(&inode->i_mutex); 6901e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6911e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 692940100a4SChris Mason 6930ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 6940ca1f7ceSYan, Zheng if (ret) 6950ca1f7ceSYan, Zheng goto err_unlock; 6963eaa2885SChris Mason again: 697940100a4SChris Mason if (inode->i_size == 0 || 698940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 699940100a4SChris Mason ret = 0; 700940100a4SChris Mason goto err_reservations; 701940100a4SChris Mason } 702940100a4SChris Mason 703f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 7040ca1f7ceSYan, Zheng if (!page) { 7050ca1f7ceSYan, Zheng ret = -ENOMEM; 706940100a4SChris Mason goto err_reservations; 7070ca1f7ceSYan, Zheng } 708940100a4SChris Mason 709f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 710f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 711f46b5a66SChristoph Hellwig lock_page(page); 712f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 713f46b5a66SChristoph Hellwig unlock_page(page); 714f46b5a66SChristoph Hellwig page_cache_release(page); 7150ca1f7ceSYan, Zheng ret = -EIO; 716940100a4SChris Mason goto err_reservations; 717f46b5a66SChristoph Hellwig } 718f46b5a66SChristoph Hellwig } 719f46b5a66SChristoph Hellwig 720940100a4SChris Mason if (page->mapping != inode->i_mapping) { 721940100a4SChris Mason unlock_page(page); 722940100a4SChris Mason page_cache_release(page); 723940100a4SChris Mason goto again; 724940100a4SChris Mason } 725940100a4SChris Mason 726f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 727f46b5a66SChristoph Hellwig 728940100a4SChris Mason if (PageDirty(page)) { 7290ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 730940100a4SChris Mason goto loop_unlock; 731940100a4SChris Mason } 732940100a4SChris Mason 733f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 734f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 735f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 7363eaa2885SChris Mason 7373eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 7383eaa2885SChris Mason if (ordered) { 7393eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 7403eaa2885SChris Mason unlock_page(page); 7413eaa2885SChris Mason page_cache_release(page); 7423eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 7433eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 7443eaa2885SChris Mason goto again; 7453eaa2885SChris Mason } 7463eaa2885SChris Mason set_page_extent_mapped(page); 7473eaa2885SChris Mason 748f87f057bSChris Mason /* 749f87f057bSChris Mason * this makes sure page_mkwrite is called on the 750f87f057bSChris Mason * page if it is dirtied again later 751f87f057bSChris Mason */ 752f87f057bSChris Mason clear_page_dirty_for_io(page); 753940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 754940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 755940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 756f87f057bSChris Mason 7572ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 758940100a4SChris Mason ClearPageChecked(page); 759f46b5a66SChristoph Hellwig set_page_dirty(page); 760a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 761940100a4SChris Mason 762940100a4SChris Mason loop_unlock: 763f46b5a66SChristoph Hellwig unlock_page(page); 764f46b5a66SChristoph Hellwig page_cache_release(page); 765940100a4SChris Mason mutex_unlock(&inode->i_mutex); 766940100a4SChris Mason 767f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 768940100a4SChris Mason i++; 769f46b5a66SChristoph Hellwig } 770f46b5a66SChristoph Hellwig 7711e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 7721e701a32SChris Mason filemap_flush(inode->i_mapping); 7731e701a32SChris Mason 7741e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 7751e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 7761e701a32SChris Mason * we have to make sure the IO is actually started and that 7771e701a32SChris Mason * ordered extents get created before we return 7781e701a32SChris Mason */ 7791e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 7801e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7811e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7821e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7831e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7841e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7851e701a32SChris Mason } 7861e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7871e701a32SChris Mason 7881e701a32SChris Mason mutex_lock(&inode->i_mutex); 7891e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7901e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7911e701a32SChris Mason } 7921e701a32SChris Mason 793f46b5a66SChristoph Hellwig return 0; 794940100a4SChris Mason 795940100a4SChris Mason err_reservations: 7960ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 7970ca1f7ceSYan, Zheng err_unlock: 798940100a4SChris Mason mutex_unlock(&inode->i_mutex); 799940100a4SChris Mason return ret; 800f46b5a66SChristoph Hellwig } 801f46b5a66SChristoph Hellwig 80276dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 80376dda93cSYan, Zheng void __user *arg) 804f46b5a66SChristoph Hellwig { 805f46b5a66SChristoph Hellwig u64 new_size; 806f46b5a66SChristoph Hellwig u64 old_size; 807f46b5a66SChristoph Hellwig u64 devid = 1; 808f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 809f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 810f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 811f46b5a66SChristoph Hellwig char *sizestr; 812f46b5a66SChristoph Hellwig char *devstr = NULL; 813f46b5a66SChristoph Hellwig int ret = 0; 814f46b5a66SChristoph Hellwig int mod = 0; 815f46b5a66SChristoph Hellwig 816c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 817c146afadSYan Zheng return -EROFS; 818c146afadSYan Zheng 819e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 820e441d54dSChris Mason return -EPERM; 821e441d54dSChris Mason 822dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 823dae7b665SLi Zefan if (IS_ERR(vol_args)) 824dae7b665SLi Zefan return PTR_ERR(vol_args); 8255516e595SMark Fasheh 8265516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 827f46b5a66SChristoph Hellwig 8287d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 829f46b5a66SChristoph Hellwig sizestr = vol_args->name; 830f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 831f46b5a66SChristoph Hellwig if (devstr) { 832f46b5a66SChristoph Hellwig char *end; 833f46b5a66SChristoph Hellwig sizestr = devstr + 1; 834f46b5a66SChristoph Hellwig *devstr = '\0'; 835f46b5a66SChristoph Hellwig devstr = vol_args->name; 836f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 83721380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 83821380931SJoel Becker (unsigned long long)devid); 839f46b5a66SChristoph Hellwig } 8402b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 841f46b5a66SChristoph Hellwig if (!device) { 84221380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 84321380931SJoel Becker (unsigned long long)devid); 844f46b5a66SChristoph Hellwig ret = -EINVAL; 845f46b5a66SChristoph Hellwig goto out_unlock; 846f46b5a66SChristoph Hellwig } 847f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 848f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 849f46b5a66SChristoph Hellwig else { 850f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 851f46b5a66SChristoph Hellwig mod = -1; 852f46b5a66SChristoph Hellwig sizestr++; 853f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 854f46b5a66SChristoph Hellwig mod = 1; 855f46b5a66SChristoph Hellwig sizestr++; 856f46b5a66SChristoph Hellwig } 85791748467SAkinobu Mita new_size = memparse(sizestr, NULL); 858f46b5a66SChristoph Hellwig if (new_size == 0) { 859f46b5a66SChristoph Hellwig ret = -EINVAL; 860f46b5a66SChristoph Hellwig goto out_unlock; 861f46b5a66SChristoph Hellwig } 862f46b5a66SChristoph Hellwig } 863f46b5a66SChristoph Hellwig 864f46b5a66SChristoph Hellwig old_size = device->total_bytes; 865f46b5a66SChristoph Hellwig 866f46b5a66SChristoph Hellwig if (mod < 0) { 867f46b5a66SChristoph Hellwig if (new_size > old_size) { 868f46b5a66SChristoph Hellwig ret = -EINVAL; 869f46b5a66SChristoph Hellwig goto out_unlock; 870f46b5a66SChristoph Hellwig } 871f46b5a66SChristoph Hellwig new_size = old_size - new_size; 872f46b5a66SChristoph Hellwig } else if (mod > 0) { 873f46b5a66SChristoph Hellwig new_size = old_size + new_size; 874f46b5a66SChristoph Hellwig } 875f46b5a66SChristoph Hellwig 876f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 877f46b5a66SChristoph Hellwig ret = -EINVAL; 878f46b5a66SChristoph Hellwig goto out_unlock; 879f46b5a66SChristoph Hellwig } 880f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 881f46b5a66SChristoph Hellwig ret = -EFBIG; 882f46b5a66SChristoph Hellwig goto out_unlock; 883f46b5a66SChristoph Hellwig } 884f46b5a66SChristoph Hellwig 885f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 886f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 887f46b5a66SChristoph Hellwig 888f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 889f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 890f46b5a66SChristoph Hellwig 891f46b5a66SChristoph Hellwig if (new_size > old_size) { 892a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 893f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 894f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 895f46b5a66SChristoph Hellwig } else { 896f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 897f46b5a66SChristoph Hellwig } 898f46b5a66SChristoph Hellwig 899f46b5a66SChristoph Hellwig out_unlock: 9007d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 901f46b5a66SChristoph Hellwig kfree(vol_args); 902f46b5a66SChristoph Hellwig return ret; 903f46b5a66SChristoph Hellwig } 904f46b5a66SChristoph Hellwig 90572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 90672fd032eSSage Weil char *name, 90772fd032eSSage Weil unsigned long fd, 90872fd032eSSage Weil int subvol, 909b83cc969SLi Zefan u64 *transid, 910b83cc969SLi Zefan bool readonly) 911f46b5a66SChristoph Hellwig { 912cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 9133de4586cSChris Mason struct file *src_file; 914f46b5a66SChristoph Hellwig int namelen; 9153de4586cSChris Mason int ret = 0; 916f46b5a66SChristoph Hellwig 917c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 918c146afadSYan Zheng return -EROFS; 919c146afadSYan Zheng 92072fd032eSSage Weil namelen = strlen(name); 92172fd032eSSage Weil if (strchr(name, '/')) { 922f46b5a66SChristoph Hellwig ret = -EINVAL; 923f46b5a66SChristoph Hellwig goto out; 924f46b5a66SChristoph Hellwig } 925f46b5a66SChristoph Hellwig 9263de4586cSChris Mason if (subvol) { 92772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 928b83cc969SLi Zefan NULL, transid, readonly); 929cb8e7090SChristoph Hellwig } else { 9303de4586cSChris Mason struct inode *src_inode; 93172fd032eSSage Weil src_file = fget(fd); 9323de4586cSChris Mason if (!src_file) { 9333de4586cSChris Mason ret = -EINVAL; 9343de4586cSChris Mason goto out; 9353de4586cSChris Mason } 9363de4586cSChris Mason 9373de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 9383de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 939d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 940d397712bSChris Mason "another FS\n"); 9413de4586cSChris Mason ret = -EINVAL; 9423de4586cSChris Mason fput(src_file); 9433de4586cSChris Mason goto out; 9443de4586cSChris Mason } 94572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 94672fd032eSSage Weil BTRFS_I(src_inode)->root, 947b83cc969SLi Zefan transid, readonly); 9483de4586cSChris Mason fput(src_file); 949cb8e7090SChristoph Hellwig } 950f46b5a66SChristoph Hellwig out: 95172fd032eSSage Weil return ret; 95272fd032eSSage Weil } 95372fd032eSSage Weil 95472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 955fa0d2b9bSLi Zefan void __user *arg, int subvol) 95672fd032eSSage Weil { 957fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 95872fd032eSSage Weil int ret; 95972fd032eSSage Weil 960fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 961fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 962fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 963fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 964fa0d2b9bSLi Zefan 965fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 966b83cc969SLi Zefan vol_args->fd, subvol, 967b83cc969SLi Zefan NULL, false); 968fa0d2b9bSLi Zefan 969fa0d2b9bSLi Zefan kfree(vol_args); 970fa0d2b9bSLi Zefan return ret; 971fa0d2b9bSLi Zefan } 972fa0d2b9bSLi Zefan 973fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 974fa0d2b9bSLi Zefan void __user *arg, int subvol) 975fa0d2b9bSLi Zefan { 976fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 977fa0d2b9bSLi Zefan int ret; 978fdfb1e4fSLi Zefan u64 transid = 0; 979fdfb1e4fSLi Zefan u64 *ptr = NULL; 980b83cc969SLi Zefan bool readonly = false; 98172fd032eSSage Weil 982fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 983fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 984fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 985fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 986fdfb1e4fSLi Zefan 987b83cc969SLi Zefan if (vol_args->flags & 988b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 989b83cc969SLi Zefan ret = -EOPNOTSUPP; 990fdfb1e4fSLi Zefan goto out; 991fdfb1e4fSLi Zefan } 992fdfb1e4fSLi Zefan 993fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 994fdfb1e4fSLi Zefan ptr = &transid; 995b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 996b83cc969SLi Zefan readonly = true; 99775eaa0e2SSage Weil 998fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 999b83cc969SLi Zefan vol_args->fd, subvol, 1000b83cc969SLi Zefan ptr, readonly); 100175eaa0e2SSage Weil 1002fdfb1e4fSLi Zefan if (ret == 0 && ptr && 100375eaa0e2SSage Weil copy_to_user(arg + 1004fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1005fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 100675eaa0e2SSage Weil ret = -EFAULT; 1007fdfb1e4fSLi Zefan out: 1008f46b5a66SChristoph Hellwig kfree(vol_args); 1009f46b5a66SChristoph Hellwig return ret; 1010f46b5a66SChristoph Hellwig } 1011f46b5a66SChristoph Hellwig 1012*0caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 1013*0caa102dSLi Zefan void __user *arg) 1014*0caa102dSLi Zefan { 1015*0caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 1016*0caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 1017*0caa102dSLi Zefan int ret = 0; 1018*0caa102dSLi Zefan u64 flags = 0; 1019*0caa102dSLi Zefan 1020*0caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 1021*0caa102dSLi Zefan return -EINVAL; 1022*0caa102dSLi Zefan 1023*0caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 1024*0caa102dSLi Zefan if (btrfs_root_readonly(root)) 1025*0caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 1026*0caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 1027*0caa102dSLi Zefan 1028*0caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 1029*0caa102dSLi Zefan ret = -EFAULT; 1030*0caa102dSLi Zefan 1031*0caa102dSLi Zefan return ret; 1032*0caa102dSLi Zefan } 1033*0caa102dSLi Zefan 1034*0caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 1035*0caa102dSLi Zefan void __user *arg) 1036*0caa102dSLi Zefan { 1037*0caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 1038*0caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 1039*0caa102dSLi Zefan struct btrfs_trans_handle *trans; 1040*0caa102dSLi Zefan u64 root_flags; 1041*0caa102dSLi Zefan u64 flags; 1042*0caa102dSLi Zefan int ret = 0; 1043*0caa102dSLi Zefan 1044*0caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 1045*0caa102dSLi Zefan return -EROFS; 1046*0caa102dSLi Zefan 1047*0caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 1048*0caa102dSLi Zefan return -EINVAL; 1049*0caa102dSLi Zefan 1050*0caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 1051*0caa102dSLi Zefan return -EFAULT; 1052*0caa102dSLi Zefan 1053*0caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_CREATE_ASYNC) 1054*0caa102dSLi Zefan return -EINVAL; 1055*0caa102dSLi Zefan 1056*0caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 1057*0caa102dSLi Zefan return -EOPNOTSUPP; 1058*0caa102dSLi Zefan 1059*0caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 1060*0caa102dSLi Zefan 1061*0caa102dSLi Zefan /* nothing to do */ 1062*0caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1063*0caa102dSLi Zefan goto out; 1064*0caa102dSLi Zefan 1065*0caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 1066*0caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 1067*0caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 1068*0caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 1069*0caa102dSLi Zefan else 1070*0caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 1071*0caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 1072*0caa102dSLi Zefan 1073*0caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 1074*0caa102dSLi Zefan if (IS_ERR(trans)) { 1075*0caa102dSLi Zefan ret = PTR_ERR(trans); 1076*0caa102dSLi Zefan goto out_reset; 1077*0caa102dSLi Zefan } 1078*0caa102dSLi Zefan 1079*0caa102dSLi Zefan ret = btrfs_update_root(trans, root, 1080*0caa102dSLi Zefan &root->root_key, &root->root_item); 1081*0caa102dSLi Zefan 1082*0caa102dSLi Zefan btrfs_commit_transaction(trans, root); 1083*0caa102dSLi Zefan out_reset: 1084*0caa102dSLi Zefan if (ret) 1085*0caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1086*0caa102dSLi Zefan out: 1087*0caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1088*0caa102dSLi Zefan return ret; 1089*0caa102dSLi Zefan } 1090*0caa102dSLi Zefan 109176dda93cSYan, Zheng /* 109276dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 109376dda93cSYan, Zheng */ 109476dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 109576dda93cSYan, Zheng { 109676dda93cSYan, Zheng struct btrfs_path *path; 109776dda93cSYan, Zheng struct btrfs_key key; 109876dda93cSYan, Zheng int ret; 109976dda93cSYan, Zheng 110076dda93cSYan, Zheng path = btrfs_alloc_path(); 110176dda93cSYan, Zheng if (!path) 110276dda93cSYan, Zheng return -ENOMEM; 110376dda93cSYan, Zheng 110476dda93cSYan, Zheng key.objectid = root->root_key.objectid; 110576dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 110676dda93cSYan, Zheng key.offset = (u64)-1; 110776dda93cSYan, Zheng 110876dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 110976dda93cSYan, Zheng &key, path, 0, 0); 111076dda93cSYan, Zheng if (ret < 0) 111176dda93cSYan, Zheng goto out; 111276dda93cSYan, Zheng BUG_ON(ret == 0); 111376dda93cSYan, Zheng 111476dda93cSYan, Zheng ret = 0; 111576dda93cSYan, Zheng if (path->slots[0] > 0) { 111676dda93cSYan, Zheng path->slots[0]--; 111776dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 111876dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 111976dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 112076dda93cSYan, Zheng ret = -ENOTEMPTY; 112176dda93cSYan, Zheng } 112276dda93cSYan, Zheng out: 112376dda93cSYan, Zheng btrfs_free_path(path); 112476dda93cSYan, Zheng return ret; 112576dda93cSYan, Zheng } 112676dda93cSYan, Zheng 1127ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1128ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1129ac8e9819SChris Mason { 1130abc6e134SChris Mason struct btrfs_key test; 1131abc6e134SChris Mason int ret; 1132abc6e134SChris Mason 1133abc6e134SChris Mason test.objectid = sk->min_objectid; 1134abc6e134SChris Mason test.type = sk->min_type; 1135abc6e134SChris Mason test.offset = sk->min_offset; 1136abc6e134SChris Mason 1137abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1138abc6e134SChris Mason if (ret < 0) 1139ac8e9819SChris Mason return 0; 1140abc6e134SChris Mason 1141abc6e134SChris Mason test.objectid = sk->max_objectid; 1142abc6e134SChris Mason test.type = sk->max_type; 1143abc6e134SChris Mason test.offset = sk->max_offset; 1144abc6e134SChris Mason 1145abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1146abc6e134SChris Mason if (ret > 0) 1147ac8e9819SChris Mason return 0; 1148ac8e9819SChris Mason return 1; 1149ac8e9819SChris Mason } 1150ac8e9819SChris Mason 1151ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1152ac8e9819SChris Mason struct btrfs_path *path, 1153ac8e9819SChris Mason struct btrfs_key *key, 1154ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1155ac8e9819SChris Mason char *buf, 1156ac8e9819SChris Mason unsigned long *sk_offset, 1157ac8e9819SChris Mason int *num_found) 1158ac8e9819SChris Mason { 1159ac8e9819SChris Mason u64 found_transid; 1160ac8e9819SChris Mason struct extent_buffer *leaf; 1161ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1162ac8e9819SChris Mason unsigned long item_off; 1163ac8e9819SChris Mason unsigned long item_len; 1164ac8e9819SChris Mason int nritems; 1165ac8e9819SChris Mason int i; 1166ac8e9819SChris Mason int slot; 1167ac8e9819SChris Mason int found = 0; 1168ac8e9819SChris Mason int ret = 0; 1169ac8e9819SChris Mason 1170ac8e9819SChris Mason leaf = path->nodes[0]; 1171ac8e9819SChris Mason slot = path->slots[0]; 1172ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1173ac8e9819SChris Mason 1174ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1175ac8e9819SChris Mason i = nritems; 1176ac8e9819SChris Mason goto advance_key; 1177ac8e9819SChris Mason } 1178ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1179ac8e9819SChris Mason 1180ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1181ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1182ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1183ac8e9819SChris Mason 1184ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1185ac8e9819SChris Mason item_len = 0; 1186ac8e9819SChris Mason 1187ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1188ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1189ac8e9819SChris Mason ret = 1; 1190ac8e9819SChris Mason goto overflow; 1191ac8e9819SChris Mason } 1192ac8e9819SChris Mason 1193ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1194ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1195ac8e9819SChris Mason continue; 1196ac8e9819SChris Mason 1197ac8e9819SChris Mason sh.objectid = key->objectid; 1198ac8e9819SChris Mason sh.offset = key->offset; 1199ac8e9819SChris Mason sh.type = key->type; 1200ac8e9819SChris Mason sh.len = item_len; 1201ac8e9819SChris Mason sh.transid = found_transid; 1202ac8e9819SChris Mason 1203ac8e9819SChris Mason /* copy search result header */ 1204ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1205ac8e9819SChris Mason *sk_offset += sizeof(sh); 1206ac8e9819SChris Mason 1207ac8e9819SChris Mason if (item_len) { 1208ac8e9819SChris Mason char *p = buf + *sk_offset; 1209ac8e9819SChris Mason /* copy the item */ 1210ac8e9819SChris Mason read_extent_buffer(leaf, p, 1211ac8e9819SChris Mason item_off, item_len); 1212ac8e9819SChris Mason *sk_offset += item_len; 1213ac8e9819SChris Mason } 121490fdde14SChris Mason found++; 1215ac8e9819SChris Mason 1216ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1217ac8e9819SChris Mason break; 1218ac8e9819SChris Mason } 1219ac8e9819SChris Mason advance_key: 1220ac8e9819SChris Mason ret = 0; 1221abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1222abc6e134SChris Mason key->offset++; 1223abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1224abc6e134SChris Mason key->offset = 0; 1225abc6e134SChris Mason key->type++; 1226abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1227abc6e134SChris Mason key->offset = 0; 1228abc6e134SChris Mason key->type = 0; 1229abc6e134SChris Mason key->objectid++; 1230abc6e134SChris Mason } else 1231abc6e134SChris Mason ret = 1; 1232ac8e9819SChris Mason overflow: 1233ac8e9819SChris Mason *num_found += found; 1234ac8e9819SChris Mason return ret; 1235ac8e9819SChris Mason } 1236ac8e9819SChris Mason 1237ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1238ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1239ac8e9819SChris Mason { 1240ac8e9819SChris Mason struct btrfs_root *root; 1241ac8e9819SChris Mason struct btrfs_key key; 1242ac8e9819SChris Mason struct btrfs_key max_key; 1243ac8e9819SChris Mason struct btrfs_path *path; 1244ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1245ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1246ac8e9819SChris Mason int ret; 1247ac8e9819SChris Mason int num_found = 0; 1248ac8e9819SChris Mason unsigned long sk_offset = 0; 1249ac8e9819SChris Mason 1250ac8e9819SChris Mason path = btrfs_alloc_path(); 1251ac8e9819SChris Mason if (!path) 1252ac8e9819SChris Mason return -ENOMEM; 1253ac8e9819SChris Mason 1254ac8e9819SChris Mason if (sk->tree_id == 0) { 1255ac8e9819SChris Mason /* search the root of the inode that was passed */ 1256ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1257ac8e9819SChris Mason } else { 1258ac8e9819SChris Mason key.objectid = sk->tree_id; 1259ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1260ac8e9819SChris Mason key.offset = (u64)-1; 1261ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1262ac8e9819SChris Mason if (IS_ERR(root)) { 1263ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1264ac8e9819SChris Mason sk->tree_id); 1265ac8e9819SChris Mason btrfs_free_path(path); 1266ac8e9819SChris Mason return -ENOENT; 1267ac8e9819SChris Mason } 1268ac8e9819SChris Mason } 1269ac8e9819SChris Mason 1270ac8e9819SChris Mason key.objectid = sk->min_objectid; 1271ac8e9819SChris Mason key.type = sk->min_type; 1272ac8e9819SChris Mason key.offset = sk->min_offset; 1273ac8e9819SChris Mason 1274ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1275ac8e9819SChris Mason max_key.type = sk->max_type; 1276ac8e9819SChris Mason max_key.offset = sk->max_offset; 1277ac8e9819SChris Mason 1278ac8e9819SChris Mason path->keep_locks = 1; 1279ac8e9819SChris Mason 1280ac8e9819SChris Mason while(1) { 1281ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1282ac8e9819SChris Mason sk->min_transid); 1283ac8e9819SChris Mason if (ret != 0) { 1284ac8e9819SChris Mason if (ret > 0) 1285ac8e9819SChris Mason ret = 0; 1286ac8e9819SChris Mason goto err; 1287ac8e9819SChris Mason } 1288ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1289ac8e9819SChris Mason &sk_offset, &num_found); 1290ac8e9819SChris Mason btrfs_release_path(root, path); 1291ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1292ac8e9819SChris Mason break; 1293ac8e9819SChris Mason 1294ac8e9819SChris Mason } 1295ac8e9819SChris Mason ret = 0; 1296ac8e9819SChris Mason err: 1297ac8e9819SChris Mason sk->nr_items = num_found; 1298ac8e9819SChris Mason btrfs_free_path(path); 1299ac8e9819SChris Mason return ret; 1300ac8e9819SChris Mason } 1301ac8e9819SChris Mason 1302ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1303ac8e9819SChris Mason void __user *argp) 1304ac8e9819SChris Mason { 1305ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1306ac8e9819SChris Mason struct inode *inode; 1307ac8e9819SChris Mason int ret; 1308ac8e9819SChris Mason 1309ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1310ac8e9819SChris Mason return -EPERM; 1311ac8e9819SChris Mason 13122354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 13132354d08fSJulia Lawall if (IS_ERR(args)) 13142354d08fSJulia Lawall return PTR_ERR(args); 1315ac8e9819SChris Mason 1316ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1317ac8e9819SChris Mason ret = search_ioctl(inode, args); 1318ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1319ac8e9819SChris Mason ret = -EFAULT; 1320ac8e9819SChris Mason kfree(args); 1321ac8e9819SChris Mason return ret; 1322ac8e9819SChris Mason } 1323ac8e9819SChris Mason 132498d377a0STARUISI Hiroaki /* 1325ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1326ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 132798d377a0STARUISI Hiroaki */ 132898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 132998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 133098d377a0STARUISI Hiroaki { 133198d377a0STARUISI Hiroaki struct btrfs_root *root; 133298d377a0STARUISI Hiroaki struct btrfs_key key; 1333ac8e9819SChris Mason char *ptr; 133498d377a0STARUISI Hiroaki int ret = -1; 133598d377a0STARUISI Hiroaki int slot; 133698d377a0STARUISI Hiroaki int len; 133798d377a0STARUISI Hiroaki int total_len = 0; 133898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 133998d377a0STARUISI Hiroaki struct extent_buffer *l; 134098d377a0STARUISI Hiroaki struct btrfs_path *path; 134198d377a0STARUISI Hiroaki 134298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 134398d377a0STARUISI Hiroaki name[0]='\0'; 134498d377a0STARUISI Hiroaki return 0; 134598d377a0STARUISI Hiroaki } 134698d377a0STARUISI Hiroaki 134798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 134898d377a0STARUISI Hiroaki if (!path) 134998d377a0STARUISI Hiroaki return -ENOMEM; 135098d377a0STARUISI Hiroaki 1351ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 135298d377a0STARUISI Hiroaki 135398d377a0STARUISI Hiroaki key.objectid = tree_id; 135498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 135598d377a0STARUISI Hiroaki key.offset = (u64)-1; 135698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 135798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 135898d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 13598ad6fcabSChris Mason ret = -ENOENT; 13608ad6fcabSChris Mason goto out; 136198d377a0STARUISI Hiroaki } 136298d377a0STARUISI Hiroaki 136398d377a0STARUISI Hiroaki key.objectid = dirid; 136498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 13658ad6fcabSChris Mason key.offset = (u64)-1; 136698d377a0STARUISI Hiroaki 136798d377a0STARUISI Hiroaki while(1) { 136898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 136998d377a0STARUISI Hiroaki if (ret < 0) 137098d377a0STARUISI Hiroaki goto out; 137198d377a0STARUISI Hiroaki 137298d377a0STARUISI Hiroaki l = path->nodes[0]; 137398d377a0STARUISI Hiroaki slot = path->slots[0]; 13748ad6fcabSChris Mason if (ret > 0 && slot > 0) 13758ad6fcabSChris Mason slot--; 137698d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 137798d377a0STARUISI Hiroaki 137898d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1379ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1380ac8e9819SChris Mason ret = -ENOENT; 138198d377a0STARUISI Hiroaki goto out; 1382ac8e9819SChris Mason } 138398d377a0STARUISI Hiroaki 138498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 138598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 138698d377a0STARUISI Hiroaki ptr -= len + 1; 138798d377a0STARUISI Hiroaki total_len += len + 1; 1388ac8e9819SChris Mason if (ptr < name) 138998d377a0STARUISI Hiroaki goto out; 139098d377a0STARUISI Hiroaki 139198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 139298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 139398d377a0STARUISI Hiroaki 139498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 139598d377a0STARUISI Hiroaki break; 139698d377a0STARUISI Hiroaki 139798d377a0STARUISI Hiroaki btrfs_release_path(root, path); 139898d377a0STARUISI Hiroaki key.objectid = key.offset; 13998ad6fcabSChris Mason key.offset = (u64)-1; 140098d377a0STARUISI Hiroaki dirid = key.objectid; 140198d377a0STARUISI Hiroaki 140298d377a0STARUISI Hiroaki } 1403ac8e9819SChris Mason if (ptr < name) 140498d377a0STARUISI Hiroaki goto out; 1405ac8e9819SChris Mason memcpy(name, ptr, total_len); 140698d377a0STARUISI Hiroaki name[total_len]='\0'; 140798d377a0STARUISI Hiroaki ret = 0; 140898d377a0STARUISI Hiroaki out: 140998d377a0STARUISI Hiroaki btrfs_free_path(path); 1410ac8e9819SChris Mason return ret; 1411ac8e9819SChris Mason } 1412ac8e9819SChris Mason 1413ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1414ac8e9819SChris Mason void __user *argp) 1415ac8e9819SChris Mason { 1416ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1417ac8e9819SChris Mason struct inode *inode; 1418ac8e9819SChris Mason int ret; 1419ac8e9819SChris Mason 1420ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1421ac8e9819SChris Mason return -EPERM; 1422ac8e9819SChris Mason 14232354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 14242354d08fSJulia Lawall if (IS_ERR(args)) 14252354d08fSJulia Lawall return PTR_ERR(args); 1426c2b96929SDan Carpenter 1427ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1428ac8e9819SChris Mason 14291b53ac4dSChris Mason if (args->treeid == 0) 14301b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 14311b53ac4dSChris Mason 1432ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1433ac8e9819SChris Mason args->treeid, args->objectid, 1434ac8e9819SChris Mason args->name); 1435ac8e9819SChris Mason 1436ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1437ac8e9819SChris Mason ret = -EFAULT; 1438ac8e9819SChris Mason 1439ac8e9819SChris Mason kfree(args); 144098d377a0STARUISI Hiroaki return ret; 144198d377a0STARUISI Hiroaki } 144298d377a0STARUISI Hiroaki 144376dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 144476dda93cSYan, Zheng void __user *arg) 144576dda93cSYan, Zheng { 144676dda93cSYan, Zheng struct dentry *parent = fdentry(file); 144776dda93cSYan, Zheng struct dentry *dentry; 144876dda93cSYan, Zheng struct inode *dir = parent->d_inode; 144976dda93cSYan, Zheng struct inode *inode; 145076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 145176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 145276dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 145376dda93cSYan, Zheng struct btrfs_trans_handle *trans; 145476dda93cSYan, Zheng int namelen; 145576dda93cSYan, Zheng int ret; 145676dda93cSYan, Zheng int err = 0; 145776dda93cSYan, Zheng 145876dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 145976dda93cSYan, Zheng if (IS_ERR(vol_args)) 146076dda93cSYan, Zheng return PTR_ERR(vol_args); 146176dda93cSYan, Zheng 146276dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 146376dda93cSYan, Zheng namelen = strlen(vol_args->name); 146476dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 146576dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 146676dda93cSYan, Zheng err = -EINVAL; 146776dda93cSYan, Zheng goto out; 146876dda93cSYan, Zheng } 146976dda93cSYan, Zheng 147076dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 147176dda93cSYan, Zheng if (err) 147276dda93cSYan, Zheng goto out; 147376dda93cSYan, Zheng 147476dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 147576dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 147676dda93cSYan, Zheng if (IS_ERR(dentry)) { 147776dda93cSYan, Zheng err = PTR_ERR(dentry); 147876dda93cSYan, Zheng goto out_unlock_dir; 147976dda93cSYan, Zheng } 148076dda93cSYan, Zheng 148176dda93cSYan, Zheng if (!dentry->d_inode) { 148276dda93cSYan, Zheng err = -ENOENT; 148376dda93cSYan, Zheng goto out_dput; 148476dda93cSYan, Zheng } 148576dda93cSYan, Zheng 148676dda93cSYan, Zheng inode = dentry->d_inode; 14874260f7c7SSage Weil dest = BTRFS_I(inode)->root; 14884260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 14894260f7c7SSage Weil /* 14904260f7c7SSage Weil * Regular user. Only allow this with a special mount 14914260f7c7SSage Weil * option, when the user has write+exec access to the 14924260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 14934260f7c7SSage Weil * allowed. 14944260f7c7SSage Weil * 14954260f7c7SSage Weil * Note that this is _not_ check that the subvol is 14964260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 14974260f7c7SSage Weil * otherwise be able to delete. 14984260f7c7SSage Weil * 14994260f7c7SSage Weil * Users who want to delete empty subvols should try 15004260f7c7SSage Weil * rmdir(2). 15014260f7c7SSage Weil */ 15024260f7c7SSage Weil err = -EPERM; 15034260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 15044260f7c7SSage Weil goto out_dput; 15054260f7c7SSage Weil 15064260f7c7SSage Weil /* 15074260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 15084260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 15094260f7c7SSage Weil * must be called on the dentry referencing the root 15104260f7c7SSage Weil * of the subvol, not a random directory contained 15114260f7c7SSage Weil * within it. 15124260f7c7SSage Weil */ 15134260f7c7SSage Weil err = -EINVAL; 15144260f7c7SSage Weil if (root == dest) 15154260f7c7SSage Weil goto out_dput; 15164260f7c7SSage Weil 15174260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 15184260f7c7SSage Weil if (err) 15194260f7c7SSage Weil goto out_dput; 15204260f7c7SSage Weil 15214260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 15224260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 15234260f7c7SSage Weil if (err) 15244260f7c7SSage Weil goto out_dput; 15254260f7c7SSage Weil } 15264260f7c7SSage Weil 152776dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 152876dda93cSYan, Zheng err = -EINVAL; 152976dda93cSYan, Zheng goto out_dput; 153076dda93cSYan, Zheng } 153176dda93cSYan, Zheng 153276dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 153376dda93cSYan, Zheng err = d_invalidate(dentry); 153476dda93cSYan, Zheng if (err) 153576dda93cSYan, Zheng goto out_unlock; 153676dda93cSYan, Zheng 153776dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 153876dda93cSYan, Zheng 153976dda93cSYan, Zheng err = may_destroy_subvol(dest); 154076dda93cSYan, Zheng if (err) 154176dda93cSYan, Zheng goto out_up_write; 154276dda93cSYan, Zheng 1543a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1544a22285a6SYan, Zheng if (IS_ERR(trans)) { 1545a22285a6SYan, Zheng err = PTR_ERR(trans); 1546d327099aSDan Carpenter goto out_up_write; 1547a22285a6SYan, Zheng } 1548a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1549a22285a6SYan, Zheng 155076dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 155176dda93cSYan, Zheng dest->root_key.objectid, 155276dda93cSYan, Zheng dentry->d_name.name, 155376dda93cSYan, Zheng dentry->d_name.len); 155476dda93cSYan, Zheng BUG_ON(ret); 155576dda93cSYan, Zheng 155676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 155776dda93cSYan, Zheng 155876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 155976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 156076dda93cSYan, Zheng dest->root_item.drop_level = 0; 156176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 156276dda93cSYan, Zheng 1563d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 156476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 156576dda93cSYan, Zheng root->fs_info->tree_root, 156676dda93cSYan, Zheng dest->root_key.objectid); 156776dda93cSYan, Zheng BUG_ON(ret); 1568d68fc57bSYan, Zheng } 156976dda93cSYan, Zheng 1570531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 157176dda93cSYan, Zheng BUG_ON(ret); 157276dda93cSYan, Zheng inode->i_flags |= S_DEAD; 157376dda93cSYan, Zheng out_up_write: 157476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 157576dda93cSYan, Zheng out_unlock: 157676dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 157776dda93cSYan, Zheng if (!err) { 1578efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 157976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 158076dda93cSYan, Zheng d_delete(dentry); 158176dda93cSYan, Zheng } 158276dda93cSYan, Zheng out_dput: 158376dda93cSYan, Zheng dput(dentry); 158476dda93cSYan, Zheng out_unlock_dir: 158576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 158676dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 158776dda93cSYan, Zheng out: 158876dda93cSYan, Zheng kfree(vol_args); 158976dda93cSYan, Zheng return err; 159076dda93cSYan, Zheng } 159176dda93cSYan, Zheng 15921e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1593f46b5a66SChristoph Hellwig { 1594f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1595f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 15961e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1597c146afadSYan Zheng int ret; 1598c146afadSYan Zheng 1599b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1600b83cc969SLi Zefan return -EROFS; 1601b83cc969SLi Zefan 1602c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1603c146afadSYan Zheng if (ret) 1604c146afadSYan Zheng return ret; 1605f46b5a66SChristoph Hellwig 1606f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1607f46b5a66SChristoph Hellwig case S_IFDIR: 1608e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1609e441d54dSChris Mason ret = -EPERM; 1610e441d54dSChris Mason goto out; 1611e441d54dSChris Mason } 16128929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 16138929ecfaSYan, Zheng if (ret) 16148929ecfaSYan, Zheng goto out; 16158929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1616f46b5a66SChristoph Hellwig break; 1617f46b5a66SChristoph Hellwig case S_IFREG: 1618e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1619e441d54dSChris Mason ret = -EINVAL; 1620e441d54dSChris Mason goto out; 1621e441d54dSChris Mason } 16221e701a32SChris Mason 16231e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 16241e701a32SChris Mason if (!range) { 16251e701a32SChris Mason ret = -ENOMEM; 16261e701a32SChris Mason goto out; 16271e701a32SChris Mason } 16281e701a32SChris Mason 16291e701a32SChris Mason if (argp) { 16301e701a32SChris Mason if (copy_from_user(range, argp, 16311e701a32SChris Mason sizeof(*range))) { 16321e701a32SChris Mason ret = -EFAULT; 16331e701a32SChris Mason kfree(range); 1634683be16eSDan Carpenter goto out; 16351e701a32SChris Mason } 16361e701a32SChris Mason /* compression requires us to start the IO */ 16371e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 16381e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 16391e701a32SChris Mason range->extent_thresh = (u32)-1; 16401e701a32SChris Mason } 16411e701a32SChris Mason } else { 16421e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 16431e701a32SChris Mason range->len = (u64)-1; 16441e701a32SChris Mason } 16458929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 16461e701a32SChris Mason kfree(range); 1647f46b5a66SChristoph Hellwig break; 16488929ecfaSYan, Zheng default: 16498929ecfaSYan, Zheng ret = -EINVAL; 1650f46b5a66SChristoph Hellwig } 1651e441d54dSChris Mason out: 1652ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1653e441d54dSChris Mason return ret; 1654f46b5a66SChristoph Hellwig } 1655f46b5a66SChristoph Hellwig 1656b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1657f46b5a66SChristoph Hellwig { 1658f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1659f46b5a66SChristoph Hellwig int ret; 1660f46b5a66SChristoph Hellwig 1661e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1662e441d54dSChris Mason return -EPERM; 1663e441d54dSChris Mason 1664dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1665dae7b665SLi Zefan if (IS_ERR(vol_args)) 1666dae7b665SLi Zefan return PTR_ERR(vol_args); 1667f46b5a66SChristoph Hellwig 16685516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1669f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1670f46b5a66SChristoph Hellwig 1671f46b5a66SChristoph Hellwig kfree(vol_args); 1672f46b5a66SChristoph Hellwig return ret; 1673f46b5a66SChristoph Hellwig } 1674f46b5a66SChristoph Hellwig 1675b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1676f46b5a66SChristoph Hellwig { 1677f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1678f46b5a66SChristoph Hellwig int ret; 1679f46b5a66SChristoph Hellwig 1680e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1681e441d54dSChris Mason return -EPERM; 1682e441d54dSChris Mason 1683c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1684c146afadSYan Zheng return -EROFS; 1685c146afadSYan Zheng 1686dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1687dae7b665SLi Zefan if (IS_ERR(vol_args)) 1688dae7b665SLi Zefan return PTR_ERR(vol_args); 1689f46b5a66SChristoph Hellwig 16905516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1691f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1692f46b5a66SChristoph Hellwig 1693f46b5a66SChristoph Hellwig kfree(vol_args); 1694f46b5a66SChristoph Hellwig return ret; 1695f46b5a66SChristoph Hellwig } 1696f46b5a66SChristoph Hellwig 169776dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1698b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1699f46b5a66SChristoph Hellwig { 1700f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1701f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1702f46b5a66SChristoph Hellwig struct file *src_file; 1703f46b5a66SChristoph Hellwig struct inode *src; 1704f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1705f46b5a66SChristoph Hellwig struct btrfs_path *path; 1706f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1707ae01a0abSYan Zheng char *buf; 1708ae01a0abSYan Zheng struct btrfs_key key; 1709f46b5a66SChristoph Hellwig u32 nritems; 1710f46b5a66SChristoph Hellwig int slot; 1711ae01a0abSYan Zheng int ret; 1712c5c9cd4dSSage Weil u64 len = olen; 1713c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1714c5c9cd4dSSage Weil u64 hint_byte; 1715d20f7043SChris Mason 1716c5c9cd4dSSage Weil /* 1717c5c9cd4dSSage Weil * TODO: 1718c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1719c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1720c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1721c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1722c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1723c5c9cd4dSSage Weil * they don't overlap)? 1724c5c9cd4dSSage Weil */ 1725c5c9cd4dSSage Weil 1726e441d54dSChris Mason /* the destination must be opened for writing */ 17272ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1728e441d54dSChris Mason return -EINVAL; 1729e441d54dSChris Mason 1730b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1731b83cc969SLi Zefan return -EROFS; 1732b83cc969SLi Zefan 1733c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1734c146afadSYan Zheng if (ret) 1735c146afadSYan Zheng return ret; 1736c146afadSYan Zheng 1737c5c9cd4dSSage Weil src_file = fget(srcfd); 1738ab67b7c1SYan Zheng if (!src_file) { 1739ab67b7c1SYan Zheng ret = -EBADF; 1740ab67b7c1SYan Zheng goto out_drop_write; 1741ab67b7c1SYan Zheng } 17425dc64164SDan Rosenberg 1743f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1744f46b5a66SChristoph Hellwig 1745c5c9cd4dSSage Weil ret = -EINVAL; 1746c5c9cd4dSSage Weil if (src == inode) 1747c5c9cd4dSSage Weil goto out_fput; 1748c5c9cd4dSSage Weil 17495dc64164SDan Rosenberg /* the src must be open for reading */ 17505dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 17515dc64164SDan Rosenberg goto out_fput; 17525dc64164SDan Rosenberg 1753ae01a0abSYan Zheng ret = -EISDIR; 1754ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1755f46b5a66SChristoph Hellwig goto out_fput; 1756f46b5a66SChristoph Hellwig 1757ae01a0abSYan Zheng ret = -EXDEV; 1758ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1759ae01a0abSYan Zheng goto out_fput; 1760ae01a0abSYan Zheng 1761ae01a0abSYan Zheng ret = -ENOMEM; 1762ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1763ae01a0abSYan Zheng if (!buf) 1764ae01a0abSYan Zheng goto out_fput; 1765ae01a0abSYan Zheng 1766ae01a0abSYan Zheng path = btrfs_alloc_path(); 1767ae01a0abSYan Zheng if (!path) { 1768ae01a0abSYan Zheng vfree(buf); 1769ae01a0abSYan Zheng goto out_fput; 1770ae01a0abSYan Zheng } 1771ae01a0abSYan Zheng path->reada = 2; 1772ae01a0abSYan Zheng 1773f46b5a66SChristoph Hellwig if (inode < src) { 1774fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1775fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1776f46b5a66SChristoph Hellwig } else { 1777fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1778fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1779f46b5a66SChristoph Hellwig } 1780f46b5a66SChristoph Hellwig 1781c5c9cd4dSSage Weil /* determine range to clone */ 1782c5c9cd4dSSage Weil ret = -EINVAL; 17832ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1784f46b5a66SChristoph Hellwig goto out_unlock; 1785c5c9cd4dSSage Weil if (len == 0) 1786c5c9cd4dSSage Weil olen = len = src->i_size - off; 1787c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1788c5c9cd4dSSage Weil if (off + len == src->i_size) 17892a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1790c5c9cd4dSSage Weil 1791c5c9cd4dSSage Weil /* verify the end result is block aligned */ 17922a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 17932a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1794c5c9cd4dSSage Weil goto out_unlock; 1795c5c9cd4dSSage Weil 1796f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1797f46b5a66SChristoph Hellwig another, and lock file content */ 1798f46b5a66SChristoph Hellwig while (1) { 179931840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1800c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 18019a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 18029a019196SSage Weil if (!ordered && 18039a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 18049a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1805f46b5a66SChristoph Hellwig break; 1806c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1807ae01a0abSYan Zheng if (ordered) 1808ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 18099a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1810f46b5a66SChristoph Hellwig } 1811f46b5a66SChristoph Hellwig 1812c5c9cd4dSSage Weil /* clone data */ 1813f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1814ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1815ae01a0abSYan Zheng key.offset = 0; 1816f46b5a66SChristoph Hellwig 1817f46b5a66SChristoph Hellwig while (1) { 1818f46b5a66SChristoph Hellwig /* 1819f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1820f46b5a66SChristoph Hellwig * tree. 1821f46b5a66SChristoph Hellwig */ 1822a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1823f46b5a66SChristoph Hellwig if (ret < 0) 1824f46b5a66SChristoph Hellwig goto out; 1825f46b5a66SChristoph Hellwig 1826ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1827ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1828f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1829f46b5a66SChristoph Hellwig if (ret < 0) 1830f46b5a66SChristoph Hellwig goto out; 1831f46b5a66SChristoph Hellwig if (ret > 0) 1832f46b5a66SChristoph Hellwig break; 1833ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1834f46b5a66SChristoph Hellwig } 1835f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1836f46b5a66SChristoph Hellwig slot = path->slots[0]; 1837f46b5a66SChristoph Hellwig 1838ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1839d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1840f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1841f46b5a66SChristoph Hellwig break; 1842f46b5a66SChristoph Hellwig 1843c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1844c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1845c5c9cd4dSSage Weil int type; 184631840ae1SZheng Yan u32 size; 184731840ae1SZheng Yan struct btrfs_key new_key; 1848c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1849c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1850c5c9cd4dSSage Weil u8 comp; 1851b5384d48SSage Weil u64 endoff; 185231840ae1SZheng Yan 185331840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 185431840ae1SZheng Yan read_extent_buffer(leaf, buf, 185531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 185631840ae1SZheng Yan size); 1857c5c9cd4dSSage Weil 1858c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1859c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1860c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1861c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1862c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1863c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1864d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1865d397712bSChris Mason extent); 1866d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1867d397712bSChris Mason extent); 1868c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1869d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1870d397712bSChris Mason extent); 1871c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1872c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1873c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1874c5c9cd4dSSage Weil extent); 1875c5c9cd4dSSage Weil } 187631840ae1SZheng Yan btrfs_release_path(root, path); 187731840ae1SZheng Yan 1878050006a7SSage Weil if (key.offset + datal <= off || 1879c5c9cd4dSSage Weil key.offset >= off+len) 1880c5c9cd4dSSage Weil goto next; 1881c5c9cd4dSSage Weil 188231840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 188331840ae1SZheng Yan new_key.objectid = inode->i_ino; 1884c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1885c5c9cd4dSSage Weil 1886a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1887a22285a6SYan, Zheng if (IS_ERR(trans)) { 1888a22285a6SYan, Zheng ret = PTR_ERR(trans); 1889a22285a6SYan, Zheng goto out; 1890a22285a6SYan, Zheng } 1891a22285a6SYan, Zheng 1892c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1893c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1894a22285a6SYan, Zheng if (off > key.offset) { 1895a22285a6SYan, Zheng datao += off - key.offset; 1896a22285a6SYan, Zheng datal -= off - key.offset; 1897a22285a6SYan, Zheng } 1898a22285a6SYan, Zheng 1899a22285a6SYan, Zheng if (key.offset + datal > off + len) 1900a22285a6SYan, Zheng datal = off + len - key.offset; 1901a22285a6SYan, Zheng 1902a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1903a22285a6SYan, Zheng new_key.offset, 1904a22285a6SYan, Zheng new_key.offset + datal, 1905a22285a6SYan, Zheng &hint_byte, 1); 1906a22285a6SYan, Zheng BUG_ON(ret); 1907a22285a6SYan, Zheng 190831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 190931840ae1SZheng Yan &new_key, size); 1910a22285a6SYan, Zheng BUG_ON(ret); 191131840ae1SZheng Yan 191231840ae1SZheng Yan leaf = path->nodes[0]; 191331840ae1SZheng Yan slot = path->slots[0]; 191431840ae1SZheng Yan write_extent_buffer(leaf, buf, 191531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 191631840ae1SZheng Yan size); 1917ae01a0abSYan Zheng 1918f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1919f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1920c5c9cd4dSSage Weil 1921c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1922c5c9cd4dSSage Weil if (!disko) 1923c5c9cd4dSSage Weil datao = 0; 1924c5c9cd4dSSage Weil 1925c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1926c5c9cd4dSSage Weil datao); 1927c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1928c5c9cd4dSSage Weil datal); 1929c5c9cd4dSSage Weil if (disko) { 1930c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1931ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 19325d4f98a2SYan Zheng disko, diskl, 0, 1933f46b5a66SChristoph Hellwig root->root_key.objectid, 19345d4f98a2SYan Zheng inode->i_ino, 19355d4f98a2SYan Zheng new_key.offset - datao); 1936ae01a0abSYan Zheng BUG_ON(ret); 1937f46b5a66SChristoph Hellwig } 1938c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1939c5c9cd4dSSage Weil u64 skip = 0; 1940c5c9cd4dSSage Weil u64 trim = 0; 1941c5c9cd4dSSage Weil if (off > key.offset) { 1942c5c9cd4dSSage Weil skip = off - key.offset; 1943c5c9cd4dSSage Weil new_key.offset += skip; 194431840ae1SZheng Yan } 1945d397712bSChris Mason 1946c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1947c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1948d397712bSChris Mason 1949c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1950c5c9cd4dSSage Weil ret = -EINVAL; 1951a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1952c5c9cd4dSSage Weil goto out; 195331840ae1SZheng Yan } 1954c5c9cd4dSSage Weil size -= skip + trim; 1955c5c9cd4dSSage Weil datal -= skip + trim; 1956a22285a6SYan, Zheng 1957a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1958a22285a6SYan, Zheng new_key.offset, 1959a22285a6SYan, Zheng new_key.offset + datal, 1960a22285a6SYan, Zheng &hint_byte, 1); 1961a22285a6SYan, Zheng BUG_ON(ret); 1962a22285a6SYan, Zheng 1963c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1964c5c9cd4dSSage Weil &new_key, size); 1965a22285a6SYan, Zheng BUG_ON(ret); 1966c5c9cd4dSSage Weil 1967c5c9cd4dSSage Weil if (skip) { 1968d397712bSChris Mason u32 start = 1969d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1970c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1971c5c9cd4dSSage Weil datal); 1972c5c9cd4dSSage Weil } 1973c5c9cd4dSSage Weil 1974c5c9cd4dSSage Weil leaf = path->nodes[0]; 1975c5c9cd4dSSage Weil slot = path->slots[0]; 1976c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1977c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1978c5c9cd4dSSage Weil size); 1979c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1980c5c9cd4dSSage Weil } 1981c5c9cd4dSSage Weil 1982c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1983a22285a6SYan, Zheng btrfs_release_path(root, path); 1984c5c9cd4dSSage Weil 1985a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1986b5384d48SSage Weil 1987b5384d48SSage Weil /* 1988b5384d48SSage Weil * we round up to the block size at eof when 1989b5384d48SSage Weil * determining which extents to clone above, 1990b5384d48SSage Weil * but shouldn't round up the file size 1991b5384d48SSage Weil */ 1992b5384d48SSage Weil endoff = new_key.offset + datal; 19935f3888ffSLi Zefan if (endoff > destoff+olen) 19945f3888ffSLi Zefan endoff = destoff+olen; 1995b5384d48SSage Weil if (endoff > inode->i_size) 1996b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 1997b5384d48SSage Weil 1998a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1999a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2000a22285a6SYan, Zheng BUG_ON(ret); 2001a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2002a22285a6SYan, Zheng } 2003c5c9cd4dSSage Weil next: 200431840ae1SZheng Yan btrfs_release_path(root, path); 2005ae01a0abSYan Zheng key.offset++; 2006ae01a0abSYan Zheng } 2007f46b5a66SChristoph Hellwig ret = 0; 2008f46b5a66SChristoph Hellwig out: 2009ae01a0abSYan Zheng btrfs_release_path(root, path); 2010c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2011f46b5a66SChristoph Hellwig out_unlock: 2012f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2013f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2014ae01a0abSYan Zheng vfree(buf); 2015ae01a0abSYan Zheng btrfs_free_path(path); 2016f46b5a66SChristoph Hellwig out_fput: 2017f46b5a66SChristoph Hellwig fput(src_file); 2018ab67b7c1SYan Zheng out_drop_write: 2019ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2020f46b5a66SChristoph Hellwig return ret; 2021f46b5a66SChristoph Hellwig } 2022f46b5a66SChristoph Hellwig 20237a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2024c5c9cd4dSSage Weil { 2025c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2026c5c9cd4dSSage Weil 20277a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2028c5c9cd4dSSage Weil return -EFAULT; 2029c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2030c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2031c5c9cd4dSSage Weil } 2032c5c9cd4dSSage Weil 2033f46b5a66SChristoph Hellwig /* 2034f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2035f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2036f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2037f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2038f46b5a66SChristoph Hellwig */ 2039b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2040f46b5a66SChristoph Hellwig { 2041f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2042f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2043f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 20441ab86aedSSage Weil int ret; 2045f46b5a66SChristoph Hellwig 20461ab86aedSSage Weil ret = -EPERM; 2047df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2048f46b5a66SChristoph Hellwig goto out; 20491ab86aedSSage Weil 20501ab86aedSSage Weil ret = -EINPROGRESS; 20511ab86aedSSage Weil if (file->private_data) 20521ab86aedSSage Weil goto out; 20539ca9ee09SSage Weil 2054b83cc969SLi Zefan ret = -EROFS; 2055b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2056b83cc969SLi Zefan goto out; 2057b83cc969SLi Zefan 2058c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2059c146afadSYan Zheng if (ret) 2060c146afadSYan Zheng goto out; 2061c146afadSYan Zheng 20629ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 20639ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 20649ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 20659ca9ee09SSage Weil 2066f46b5a66SChristoph Hellwig ret = -ENOMEM; 20671ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 20681ab86aedSSage Weil if (!trans) 20691ab86aedSSage Weil goto out_drop; 20701ab86aedSSage Weil 20711ab86aedSSage Weil file->private_data = trans; 20721ab86aedSSage Weil return 0; 20731ab86aedSSage Weil 20741ab86aedSSage Weil out_drop: 20751ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 20761ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 20771ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 20781ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2079f46b5a66SChristoph Hellwig out: 2080f46b5a66SChristoph Hellwig return ret; 2081f46b5a66SChristoph Hellwig } 2082f46b5a66SChristoph Hellwig 20836ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 20846ef5ed0dSJosef Bacik { 20856ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 20866ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 20876ef5ed0dSJosef Bacik struct btrfs_root *new_root; 20886ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 20896ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 20906ef5ed0dSJosef Bacik struct btrfs_path *path; 20916ef5ed0dSJosef Bacik struct btrfs_key location; 20926ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 20936ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 20946ef5ed0dSJosef Bacik u64 features; 20956ef5ed0dSJosef Bacik u64 objectid = 0; 20966ef5ed0dSJosef Bacik u64 dir_id; 20976ef5ed0dSJosef Bacik 20986ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 20996ef5ed0dSJosef Bacik return -EPERM; 21006ef5ed0dSJosef Bacik 21016ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 21026ef5ed0dSJosef Bacik return -EFAULT; 21036ef5ed0dSJosef Bacik 21046ef5ed0dSJosef Bacik if (!objectid) 21056ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 21066ef5ed0dSJosef Bacik 21076ef5ed0dSJosef Bacik location.objectid = objectid; 21086ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 21096ef5ed0dSJosef Bacik location.offset = (u64)-1; 21106ef5ed0dSJosef Bacik 21116ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 21126ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 21136ef5ed0dSJosef Bacik return PTR_ERR(new_root); 21146ef5ed0dSJosef Bacik 21156ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 21166ef5ed0dSJosef Bacik return -ENOENT; 21176ef5ed0dSJosef Bacik 21186ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 21196ef5ed0dSJosef Bacik if (!path) 21206ef5ed0dSJosef Bacik return -ENOMEM; 21216ef5ed0dSJosef Bacik path->leave_spinning = 1; 21226ef5ed0dSJosef Bacik 21236ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 21246ef5ed0dSJosef Bacik if (!trans) { 21256ef5ed0dSJosef Bacik btrfs_free_path(path); 21266ef5ed0dSJosef Bacik return -ENOMEM; 21276ef5ed0dSJosef Bacik } 21286ef5ed0dSJosef Bacik 21296ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 21306ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 21316ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2132cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 21336ef5ed0dSJosef Bacik btrfs_free_path(path); 21346ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 21356ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 21366ef5ed0dSJosef Bacik "this isn't going to work\n"); 21376ef5ed0dSJosef Bacik return -ENOENT; 21386ef5ed0dSJosef Bacik } 21396ef5ed0dSJosef Bacik 21406ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 21416ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 21426ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 21436ef5ed0dSJosef Bacik btrfs_free_path(path); 21446ef5ed0dSJosef Bacik 21456ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 21466ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 21476ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 21486ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 21496ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 21506ef5ed0dSJosef Bacik } 21516ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 21526ef5ed0dSJosef Bacik 21536ef5ed0dSJosef Bacik return 0; 21546ef5ed0dSJosef Bacik } 21556ef5ed0dSJosef Bacik 2156bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2157bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2158bf5fc093SJosef Bacik { 2159bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2160bf5fc093SJosef Bacik 2161bf5fc093SJosef Bacik space->total_bytes = 0; 2162bf5fc093SJosef Bacik space->used_bytes = 0; 2163bf5fc093SJosef Bacik space->flags = 0; 2164bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2165bf5fc093SJosef Bacik space->flags = block_group->flags; 2166bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2167bf5fc093SJosef Bacik space->used_bytes += 2168bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2169bf5fc093SJosef Bacik } 2170bf5fc093SJosef Bacik } 2171bf5fc093SJosef Bacik 21721406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 21731406e432SJosef Bacik { 21741406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 21751406e432SJosef Bacik struct btrfs_ioctl_space_info space; 21761406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 21777fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 21787fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 21791406e432SJosef Bacik struct btrfs_space_info *info; 2180bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2181bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2182bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2183bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2184bf5fc093SJosef Bacik int num_types = 4; 21857fde62bfSChris Mason int alloc_size; 21861406e432SJosef Bacik int ret = 0; 21877fde62bfSChris Mason int slot_count = 0; 2188bf5fc093SJosef Bacik int i, c; 21891406e432SJosef Bacik 21901406e432SJosef Bacik if (copy_from_user(&space_args, 21911406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 21921406e432SJosef Bacik sizeof(space_args))) 21931406e432SJosef Bacik return -EFAULT; 21941406e432SJosef Bacik 2195bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2196bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2197bf5fc093SJosef Bacik 2198bf5fc093SJosef Bacik info = NULL; 21997fde62bfSChris Mason rcu_read_lock(); 2200bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2201bf5fc093SJosef Bacik list) { 2202bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2203bf5fc093SJosef Bacik info = tmp; 2204bf5fc093SJosef Bacik break; 2205bf5fc093SJosef Bacik } 2206bf5fc093SJosef Bacik } 22077fde62bfSChris Mason rcu_read_unlock(); 22081406e432SJosef Bacik 2209bf5fc093SJosef Bacik if (!info) 2210bf5fc093SJosef Bacik continue; 2211bf5fc093SJosef Bacik 2212bf5fc093SJosef Bacik down_read(&info->groups_sem); 2213bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2214bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2215bf5fc093SJosef Bacik slot_count++; 2216bf5fc093SJosef Bacik } 2217bf5fc093SJosef Bacik up_read(&info->groups_sem); 2218bf5fc093SJosef Bacik } 2219bf5fc093SJosef Bacik 22207fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 22217fde62bfSChris Mason if (space_args.space_slots == 0) { 22227fde62bfSChris Mason space_args.total_spaces = slot_count; 22237fde62bfSChris Mason goto out; 22247fde62bfSChris Mason } 2225bf5fc093SJosef Bacik 2226bf5fc093SJosef Bacik slot_count = min_t(int, space_args.space_slots, slot_count); 2227bf5fc093SJosef Bacik 22287fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2229bf5fc093SJosef Bacik 22307fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 22317fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 22327fde62bfSChris Mason */ 22337fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 22347fde62bfSChris Mason return -ENOMEM; 22357fde62bfSChris Mason 22367fde62bfSChris Mason space_args.total_spaces = 0; 22377fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 22387fde62bfSChris Mason if (!dest) 22397fde62bfSChris Mason return -ENOMEM; 22407fde62bfSChris Mason dest_orig = dest; 22417fde62bfSChris Mason 22427fde62bfSChris Mason /* now we have a buffer to copy into */ 2243bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2244bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2245bf5fc093SJosef Bacik 2246bf5fc093SJosef Bacik info = NULL; 22471406e432SJosef Bacik rcu_read_lock(); 2248bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2249bf5fc093SJosef Bacik list) { 2250bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2251bf5fc093SJosef Bacik info = tmp; 22527fde62bfSChris Mason break; 2253bf5fc093SJosef Bacik } 2254bf5fc093SJosef Bacik } 2255bf5fc093SJosef Bacik rcu_read_unlock(); 22567fde62bfSChris Mason 2257bf5fc093SJosef Bacik if (!info) 2258bf5fc093SJosef Bacik continue; 2259bf5fc093SJosef Bacik down_read(&info->groups_sem); 2260bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2261bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2262bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2263bf5fc093SJosef Bacik &space); 22647fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 22651406e432SJosef Bacik dest++; 22661406e432SJosef Bacik space_args.total_spaces++; 22671406e432SJosef Bacik } 2268bf5fc093SJosef Bacik } 2269bf5fc093SJosef Bacik up_read(&info->groups_sem); 2270bf5fc093SJosef Bacik } 22711406e432SJosef Bacik 22727fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 22737fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 22747fde62bfSChris Mason 22757fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 22767fde62bfSChris Mason ret = -EFAULT; 22777fde62bfSChris Mason 22787fde62bfSChris Mason kfree(dest_orig); 22797fde62bfSChris Mason out: 22807fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 22811406e432SJosef Bacik ret = -EFAULT; 22821406e432SJosef Bacik 22831406e432SJosef Bacik return ret; 22841406e432SJosef Bacik } 22851406e432SJosef Bacik 2286f46b5a66SChristoph Hellwig /* 2287f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2288f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2289f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2290f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2291f46b5a66SChristoph Hellwig */ 2292f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2293f46b5a66SChristoph Hellwig { 2294f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2295f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2296f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2297f46b5a66SChristoph Hellwig 2298f46b5a66SChristoph Hellwig trans = file->private_data; 22991ab86aedSSage Weil if (!trans) 23001ab86aedSSage Weil return -EINVAL; 2301b214107eSChristoph Hellwig file->private_data = NULL; 23029ca9ee09SSage Weil 23031ab86aedSSage Weil btrfs_end_transaction(trans, root); 23041ab86aedSSage Weil 23059ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 23069ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 23079ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 23089ca9ee09SSage Weil 2309cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 23101ab86aedSSage Weil return 0; 2311f46b5a66SChristoph Hellwig } 2312f46b5a66SChristoph Hellwig 231346204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 231446204592SSage Weil { 231546204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 231646204592SSage Weil struct btrfs_trans_handle *trans; 231746204592SSage Weil u64 transid; 231846204592SSage Weil 231946204592SSage Weil trans = btrfs_start_transaction(root, 0); 232046204592SSage Weil transid = trans->transid; 232146204592SSage Weil btrfs_commit_transaction_async(trans, root, 0); 232246204592SSage Weil 232346204592SSage Weil if (argp) 232446204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 232546204592SSage Weil return -EFAULT; 232646204592SSage Weil return 0; 232746204592SSage Weil } 232846204592SSage Weil 232946204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 233046204592SSage Weil { 233146204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 233246204592SSage Weil u64 transid; 233346204592SSage Weil 233446204592SSage Weil if (argp) { 233546204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 233646204592SSage Weil return -EFAULT; 233746204592SSage Weil } else { 233846204592SSage Weil transid = 0; /* current trans */ 233946204592SSage Weil } 234046204592SSage Weil return btrfs_wait_for_commit(root, transid); 234146204592SSage Weil } 234246204592SSage Weil 2343f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2344f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2345f46b5a66SChristoph Hellwig { 2346f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 23474bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2348f46b5a66SChristoph Hellwig 2349f46b5a66SChristoph Hellwig switch (cmd) { 23506cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 23516cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 23526cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 23536cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 23546cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 23556cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2356f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2357fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2358fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2359fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 23603de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2361fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 236276dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 236376dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 2364*0caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 2365*0caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 2366*0caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 2367*0caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 23686ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 23696ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2370f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 23711e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 23721e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 23731e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2374f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 23754bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2376f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 23774bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2378f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 23794bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2380f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2381f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2382f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2383c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2384c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 23857a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2386f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2387f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2388f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2389f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2390ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2391ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2392ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2393ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 23941406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 23951406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2396f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2397f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2398f46b5a66SChristoph Hellwig return 0; 239946204592SSage Weil case BTRFS_IOC_START_SYNC: 240046204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 240146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 240246204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2403f46b5a66SChristoph Hellwig } 2404f46b5a66SChristoph Hellwig 2405f46b5a66SChristoph Hellwig return -ENOTTY; 2406f46b5a66SChristoph Hellwig } 2407