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 141*75e7cb7fSLiu Bo static int check_flags(unsigned int flags) 142*75e7cb7fSLiu Bo { 143*75e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 144*75e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 145*75e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 146*75e7cb7fSLiu Bo FS_NOCOMP_FL | FS_COMPR_FL | \ 147*75e7cb7fSLiu Bo FS_NOCOW_FL | FS_COW_FL)) 148*75e7cb7fSLiu Bo return -EOPNOTSUPP; 149*75e7cb7fSLiu Bo 150*75e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 151*75e7cb7fSLiu Bo return -EINVAL; 152*75e7cb7fSLiu Bo 153*75e7cb7fSLiu Bo if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) 154*75e7cb7fSLiu Bo return -EINVAL; 155*75e7cb7fSLiu Bo 156*75e7cb7fSLiu Bo return 0; 157*75e7cb7fSLiu Bo } 158*75e7cb7fSLiu Bo 1596cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1606cbff00fSChristoph Hellwig { 1616cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1626cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1636cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1646cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1656cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1666cbff00fSChristoph Hellwig int ret; 1676cbff00fSChristoph Hellwig 168b83cc969SLi Zefan if (btrfs_root_readonly(root)) 169b83cc969SLi Zefan return -EROFS; 170b83cc969SLi Zefan 1716cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1726cbff00fSChristoph Hellwig return -EFAULT; 1736cbff00fSChristoph Hellwig 174*75e7cb7fSLiu Bo ret = check_flags(flags); 175*75e7cb7fSLiu Bo if (ret) 176*75e7cb7fSLiu Bo return ret; 1776cbff00fSChristoph Hellwig 1786cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1796cbff00fSChristoph Hellwig return -EACCES; 1806cbff00fSChristoph Hellwig 1816cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1826cbff00fSChristoph Hellwig 1836cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1846cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1856cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1866cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1876cbff00fSChristoph Hellwig ret = -EPERM; 1886cbff00fSChristoph Hellwig goto out_unlock; 1896cbff00fSChristoph Hellwig } 1906cbff00fSChristoph Hellwig } 1916cbff00fSChristoph Hellwig 1926cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1936cbff00fSChristoph Hellwig if (ret) 1946cbff00fSChristoph Hellwig goto out_unlock; 1956cbff00fSChristoph Hellwig 1966cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1976cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1986cbff00fSChristoph Hellwig else 1996cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2006cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2016cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2026cbff00fSChristoph Hellwig else 2036cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2046cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2056cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2066cbff00fSChristoph Hellwig else 2076cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2086cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2096cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2106cbff00fSChristoph Hellwig else 2116cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2126cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2136cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2146cbff00fSChristoph Hellwig else 2156cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2166cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2176cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2186cbff00fSChristoph Hellwig else 2196cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2206cbff00fSChristoph Hellwig 221*75e7cb7fSLiu Bo /* 222*75e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 223*75e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 224*75e7cb7fSLiu Bo * things smaller. 225*75e7cb7fSLiu Bo */ 226*75e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 227*75e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 228*75e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 229*75e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 230*75e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 231*75e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 232*75e7cb7fSLiu Bo } 233*75e7cb7fSLiu Bo if (flags & FS_NOCOW_FL) 234*75e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NODATACOW; 235*75e7cb7fSLiu Bo else if (flags & FS_COW_FL) 236*75e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NODATACOW; 2376cbff00fSChristoph Hellwig 2386cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2393612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 2406cbff00fSChristoph Hellwig 2416cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2426cbff00fSChristoph Hellwig BUG_ON(ret); 2436cbff00fSChristoph Hellwig 2446cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2456cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2466cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2476cbff00fSChristoph Hellwig 2486cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2496cbff00fSChristoph Hellwig out_unlock: 2506cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2516cbff00fSChristoph Hellwig return 0; 2526cbff00fSChristoph Hellwig } 2536cbff00fSChristoph Hellwig 2546cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2556cbff00fSChristoph Hellwig { 2566cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2576cbff00fSChristoph Hellwig 2586cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2596cbff00fSChristoph Hellwig } 260f46b5a66SChristoph Hellwig 261cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 262cb8e7090SChristoph Hellwig struct dentry *dentry, 26372fd032eSSage Weil char *name, int namelen, 26472fd032eSSage Weil u64 *async_transid) 265f46b5a66SChristoph Hellwig { 266f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 267f46b5a66SChristoph Hellwig struct btrfs_key key; 268f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 269f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 270f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 27176dda93cSYan, Zheng struct btrfs_root *new_root; 2726a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 2736a912213SJosef Bacik struct inode *dir; 274f46b5a66SChristoph Hellwig int ret; 275f46b5a66SChristoph Hellwig int err; 276f46b5a66SChristoph Hellwig u64 objectid; 277f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2783de4586cSChris Mason u64 index = 0; 279f46b5a66SChristoph Hellwig 280a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 281a22285a6SYan, Zheng 0, &objectid); 2826a912213SJosef Bacik if (ret) { 2836a912213SJosef Bacik dput(parent); 284a22285a6SYan, Zheng return ret; 2856a912213SJosef Bacik } 2866a912213SJosef Bacik 2876a912213SJosef Bacik dir = parent->d_inode; 2886a912213SJosef Bacik 2899ed74f2dSJosef Bacik /* 2909ed74f2dSJosef Bacik * 1 - inode item 2919ed74f2dSJosef Bacik * 2 - refs 2929ed74f2dSJosef Bacik * 1 - root item 2939ed74f2dSJosef Bacik * 2 - dir items 2949ed74f2dSJosef Bacik */ 295a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 2966a912213SJosef Bacik if (IS_ERR(trans)) { 2976a912213SJosef Bacik dput(parent); 298a22285a6SYan, Zheng return PTR_ERR(trans); 2996a912213SJosef Bacik } 300f46b5a66SChristoph Hellwig 3015d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3025d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 3038e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3048e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3058e8a1e31SJosef Bacik goto fail; 3068e8a1e31SJosef Bacik } 307f46b5a66SChristoph Hellwig 3085d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 309f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 310f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3115d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 312f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 313f46b5a66SChristoph Hellwig 314f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 315f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 316f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3175d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3185d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3195d4f98a2SYan Zheng BTRFS_UUID_SIZE); 320f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 321f46b5a66SChristoph Hellwig 322f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 323f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 324f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 325f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 326f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 327a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 328f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 329f46b5a66SChristoph Hellwig 330f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 33184234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 332f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 333f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 33486b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 33580ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 336f46b5a66SChristoph Hellwig 337f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 338f46b5a66SChristoph Hellwig root_item.drop_level = 0; 339f46b5a66SChristoph Hellwig 340925baeddSChris Mason btrfs_tree_unlock(leaf); 341f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 342f46b5a66SChristoph Hellwig leaf = NULL; 343f46b5a66SChristoph Hellwig 344f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 345f46b5a66SChristoph Hellwig 346f46b5a66SChristoph Hellwig key.objectid = objectid; 3475d4f98a2SYan Zheng key.offset = 0; 348f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 349f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 350f46b5a66SChristoph Hellwig &root_item); 351f46b5a66SChristoph Hellwig if (ret) 352f46b5a66SChristoph Hellwig goto fail; 353f46b5a66SChristoph Hellwig 35476dda93cSYan, Zheng key.offset = (u64)-1; 35576dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 35676dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 35776dda93cSYan, Zheng 35876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 35976dda93cSYan, Zheng 36076dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 36176dda93cSYan, Zheng BTRFS_I(dir)->block_group); 362f46b5a66SChristoph Hellwig /* 363f46b5a66SChristoph Hellwig * insert the directory item 364f46b5a66SChristoph Hellwig */ 3653de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3663de4586cSChris Mason BUG_ON(ret); 3673de4586cSChris Mason 3683de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 369f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3703de4586cSChris Mason BTRFS_FT_DIR, index); 371f46b5a66SChristoph Hellwig if (ret) 372f46b5a66SChristoph Hellwig goto fail; 3730660b5afSChris Mason 37452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 37552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 37652c26179SYan Zheng BUG_ON(ret); 37752c26179SYan Zheng 3780660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3794df27c4dSYan, Zheng objectid, root->root_key.objectid, 3800660b5afSChris Mason dir->i_ino, index, name, namelen); 38176dda93cSYan, Zheng 3820660b5afSChris Mason BUG_ON(ret); 3830660b5afSChris Mason 38476dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 385f46b5a66SChristoph Hellwig fail: 3866a912213SJosef Bacik dput(parent); 38772fd032eSSage Weil if (async_transid) { 38872fd032eSSage Weil *async_transid = trans->transid; 38972fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 39072fd032eSSage Weil } else { 39176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 39272fd032eSSage Weil } 393f46b5a66SChristoph Hellwig if (err && !ret) 394f46b5a66SChristoph Hellwig ret = err; 395f46b5a66SChristoph Hellwig return ret; 396f46b5a66SChristoph Hellwig } 397f46b5a66SChristoph Hellwig 39872fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 399b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 400b83cc969SLi Zefan bool readonly) 401f46b5a66SChristoph Hellwig { 4022e4bfab9SYan, Zheng struct inode *inode; 4036a912213SJosef Bacik struct dentry *parent; 404f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 405f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4062e4bfab9SYan, Zheng int ret; 407f46b5a66SChristoph Hellwig 408f46b5a66SChristoph Hellwig if (!root->ref_cows) 409f46b5a66SChristoph Hellwig return -EINVAL; 410f46b5a66SChristoph Hellwig 411a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 412a22285a6SYan, Zheng if (!pending_snapshot) 413a22285a6SYan, Zheng return -ENOMEM; 414a22285a6SYan, Zheng 415a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 416a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 417a22285a6SYan, Zheng pending_snapshot->root = root; 418b83cc969SLi Zefan pending_snapshot->readonly = readonly; 419a22285a6SYan, Zheng 420a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 421a22285a6SYan, Zheng if (IS_ERR(trans)) { 422a22285a6SYan, Zheng ret = PTR_ERR(trans); 423a22285a6SYan, Zheng goto fail; 424a22285a6SYan, Zheng } 425a22285a6SYan, Zheng 426a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 427a22285a6SYan, Zheng BUG_ON(ret); 428a22285a6SYan, Zheng 429a22285a6SYan, Zheng list_add(&pending_snapshot->list, 430a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 43172fd032eSSage Weil if (async_transid) { 43272fd032eSSage Weil *async_transid = trans->transid; 43372fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 43472fd032eSSage Weil root->fs_info->extent_root, 1); 43572fd032eSSage Weil } else { 43672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 43772fd032eSSage Weil root->fs_info->extent_root); 43872fd032eSSage Weil } 439a22285a6SYan, Zheng BUG_ON(ret); 440a22285a6SYan, Zheng 441a22285a6SYan, Zheng ret = pending_snapshot->error; 442f46b5a66SChristoph Hellwig if (ret) 4432e4bfab9SYan, Zheng goto fail; 444f46b5a66SChristoph Hellwig 44566b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 44666b4ffd1SJosef Bacik if (ret) 44766b4ffd1SJosef Bacik goto fail; 448f46b5a66SChristoph Hellwig 4496a912213SJosef Bacik parent = dget_parent(dentry); 4506a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 4516a912213SJosef Bacik dput(parent); 4522e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4532e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4542e4bfab9SYan, Zheng goto fail; 4552e4bfab9SYan, Zheng } 4562e4bfab9SYan, Zheng BUG_ON(!inode); 4572e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4582e4bfab9SYan, Zheng ret = 0; 4592e4bfab9SYan, Zheng fail: 460a22285a6SYan, Zheng kfree(pending_snapshot); 461f46b5a66SChristoph Hellwig return ret; 462f46b5a66SChristoph Hellwig } 463f46b5a66SChristoph Hellwig 4644260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 4654260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 4664260f7c7SSage Weil * minimal. 4674260f7c7SSage Weil */ 4684260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 4694260f7c7SSage Weil { 4704260f7c7SSage Weil uid_t fsuid = current_fsuid(); 4714260f7c7SSage Weil 4724260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 4734260f7c7SSage Weil return 0; 4744260f7c7SSage Weil if (inode->i_uid == fsuid) 4754260f7c7SSage Weil return 0; 4764260f7c7SSage Weil if (dir->i_uid == fsuid) 4774260f7c7SSage Weil return 0; 4784260f7c7SSage Weil return !capable(CAP_FOWNER); 4794260f7c7SSage Weil } 4804260f7c7SSage Weil 4814260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 4824260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 4834260f7c7SSage Weil * whether the type of victim is right. 4844260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 4854260f7c7SSage Weil * 2. We should have write and exec permissions on dir 4864260f7c7SSage Weil * 3. We can't remove anything from append-only dir 4874260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 4884260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 4894260f7c7SSage Weil * a. be owner of dir, or 4904260f7c7SSage Weil * b. be owner of victim, or 4914260f7c7SSage Weil * c. have CAP_FOWNER capability 4924260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 4934260f7c7SSage Weil * links pointing to it. 4944260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 4954260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 4964260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 4974260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 4984260f7c7SSage Weil * nfs_async_unlink(). 4994260f7c7SSage Weil */ 5004260f7c7SSage Weil 5014260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5024260f7c7SSage Weil { 5034260f7c7SSage Weil int error; 5044260f7c7SSage Weil 5054260f7c7SSage Weil if (!victim->d_inode) 5064260f7c7SSage Weil return -ENOENT; 5074260f7c7SSage Weil 5084260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5094260f7c7SSage Weil audit_inode_child(victim, dir); 5104260f7c7SSage Weil 5114260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5124260f7c7SSage Weil if (error) 5134260f7c7SSage Weil return error; 5144260f7c7SSage Weil if (IS_APPEND(dir)) 5154260f7c7SSage Weil return -EPERM; 5164260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 5174260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 5184260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 5194260f7c7SSage Weil return -EPERM; 5204260f7c7SSage Weil if (isdir) { 5214260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 5224260f7c7SSage Weil return -ENOTDIR; 5234260f7c7SSage Weil if (IS_ROOT(victim)) 5244260f7c7SSage Weil return -EBUSY; 5254260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 5264260f7c7SSage Weil return -EISDIR; 5274260f7c7SSage Weil if (IS_DEADDIR(dir)) 5284260f7c7SSage Weil return -ENOENT; 5294260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 5304260f7c7SSage Weil return -EBUSY; 5314260f7c7SSage Weil return 0; 5324260f7c7SSage Weil } 5334260f7c7SSage Weil 534cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 535cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 536cb8e7090SChristoph Hellwig { 537cb8e7090SChristoph Hellwig if (child->d_inode) 538cb8e7090SChristoph Hellwig return -EEXIST; 539cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 540cb8e7090SChristoph Hellwig return -ENOENT; 541cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 542cb8e7090SChristoph Hellwig } 543cb8e7090SChristoph Hellwig 544cb8e7090SChristoph Hellwig /* 545cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 546cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 547cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 548cb8e7090SChristoph Hellwig */ 54976dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 55076dda93cSYan, Zheng char *name, int namelen, 55172fd032eSSage Weil struct btrfs_root *snap_src, 552b83cc969SLi Zefan u64 *async_transid, bool readonly) 553cb8e7090SChristoph Hellwig { 55476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 555cb8e7090SChristoph Hellwig struct dentry *dentry; 556cb8e7090SChristoph Hellwig int error; 557cb8e7090SChristoph Hellwig 55876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 559cb8e7090SChristoph Hellwig 560cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 561cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 562cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 563cb8e7090SChristoph Hellwig goto out_unlock; 564cb8e7090SChristoph Hellwig 565cb8e7090SChristoph Hellwig error = -EEXIST; 566cb8e7090SChristoph Hellwig if (dentry->d_inode) 567cb8e7090SChristoph Hellwig goto out_dput; 568cb8e7090SChristoph Hellwig 569cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 570cb8e7090SChristoph Hellwig if (error) 571cb8e7090SChristoph Hellwig goto out_dput; 572cb8e7090SChristoph Hellwig 57376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 574cb8e7090SChristoph Hellwig if (error) 575cb8e7090SChristoph Hellwig goto out_drop_write; 576cb8e7090SChristoph Hellwig 57776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 57876dda93cSYan, Zheng 57976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 58076dda93cSYan, Zheng goto out_up_read; 58176dda93cSYan, Zheng 5823de4586cSChris Mason if (snap_src) { 58372fd032eSSage Weil error = create_snapshot(snap_src, dentry, 584b83cc969SLi Zefan name, namelen, async_transid, readonly); 5853de4586cSChris Mason } else { 58676dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 58772fd032eSSage Weil name, namelen, async_transid); 5883de4586cSChris Mason } 58976dda93cSYan, Zheng if (!error) 59076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 59176dda93cSYan, Zheng out_up_read: 59276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 593cb8e7090SChristoph Hellwig out_drop_write: 594cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 595cb8e7090SChristoph Hellwig out_dput: 596cb8e7090SChristoph Hellwig dput(dentry); 597cb8e7090SChristoph Hellwig out_unlock: 59876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 599cb8e7090SChristoph Hellwig return error; 600cb8e7090SChristoph Hellwig } 601cb8e7090SChristoph Hellwig 602940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 6031e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 6041e701a32SChris Mason u64 *defrag_end) 605940100a4SChris Mason { 606940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 607940100a4SChris Mason struct extent_map *em = NULL; 608940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 609940100a4SChris Mason int ret = 1; 610940100a4SChris Mason 6111e701a32SChris Mason 6121e701a32SChris Mason if (thresh == 0) 6131e701a32SChris Mason thresh = 256 * 1024; 6141e701a32SChris Mason 615940100a4SChris Mason /* 616940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 617940100a4SChris Mason * defragging it 618940100a4SChris Mason */ 619940100a4SChris Mason if (start < *defrag_end) 620940100a4SChris Mason return 1; 621940100a4SChris Mason 622940100a4SChris Mason *skip = 0; 623940100a4SChris Mason 624940100a4SChris Mason /* 625940100a4SChris Mason * hopefully we have this extent in the tree already, try without 626940100a4SChris Mason * the full extent lock 627940100a4SChris Mason */ 628940100a4SChris Mason read_lock(&em_tree->lock); 629940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 630940100a4SChris Mason read_unlock(&em_tree->lock); 631940100a4SChris Mason 632940100a4SChris Mason if (!em) { 633940100a4SChris Mason /* get the big lock and read metadata off disk */ 634940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 635940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 636940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 637940100a4SChris Mason 6386cf8bfbfSDan Carpenter if (IS_ERR(em)) 639940100a4SChris Mason return 0; 640940100a4SChris Mason } 641940100a4SChris Mason 642940100a4SChris Mason /* this will cover holes, and inline extents */ 643940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 644940100a4SChris Mason ret = 0; 645940100a4SChris Mason 646940100a4SChris Mason /* 647940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 648940100a4SChris Mason */ 6491e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 650940100a4SChris Mason ret = 0; 651940100a4SChris Mason 652940100a4SChris Mason /* 653940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 654940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 655940100a4SChris Mason * so that the next tiny extent will force a defrag. 656940100a4SChris Mason * 657940100a4SChris Mason * The end result of this is that tiny extents before a single big 658940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 659940100a4SChris Mason */ 660940100a4SChris Mason if (ret) { 661940100a4SChris Mason *last_len += len; 662940100a4SChris Mason *defrag_end = extent_map_end(em); 663940100a4SChris Mason } else { 664940100a4SChris Mason *last_len = 0; 665940100a4SChris Mason *skip = extent_map_end(em); 666940100a4SChris Mason *defrag_end = 0; 667940100a4SChris Mason } 668940100a4SChris Mason 669940100a4SChris Mason free_extent_map(em); 670940100a4SChris Mason return ret; 671940100a4SChris Mason } 672940100a4SChris Mason 6731e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 6741e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 675f46b5a66SChristoph Hellwig { 676f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 677f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 678f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6793eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 680f46b5a66SChristoph Hellwig struct page *page; 6811a419d85SLi Zefan struct btrfs_super_block *disk_super; 682f46b5a66SChristoph Hellwig unsigned long last_index; 683f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 684f46b5a66SChristoph Hellwig unsigned long total_read = 0; 6851a419d85SLi Zefan u64 features; 686f46b5a66SChristoph Hellwig u64 page_start; 687f46b5a66SChristoph Hellwig u64 page_end; 688940100a4SChris Mason u64 last_len = 0; 689940100a4SChris Mason u64 skip = 0; 690940100a4SChris Mason u64 defrag_end = 0; 691f46b5a66SChristoph Hellwig unsigned long i; 692f46b5a66SChristoph Hellwig int ret; 6931a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 6941a419d85SLi Zefan 6951a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 6961a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 6971a419d85SLi Zefan return -EINVAL; 6981a419d85SLi Zefan if (range->compress_type) 6991a419d85SLi Zefan compress_type = range->compress_type; 7001a419d85SLi Zefan } 701f46b5a66SChristoph Hellwig 702940100a4SChris Mason if (inode->i_size == 0) 703940100a4SChris Mason return 0; 704f46b5a66SChristoph Hellwig 7051e701a32SChris Mason if (range->start + range->len > range->start) { 7061e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 7071e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 7081e701a32SChris Mason } else { 709940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 7101e701a32SChris Mason } 7111e701a32SChris Mason 7121e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 713940100a4SChris Mason while (i <= last_index) { 714940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 7151e701a32SChris Mason PAGE_CACHE_SIZE, 7161e701a32SChris Mason range->extent_thresh, 7171e701a32SChris Mason &last_len, &skip, 718940100a4SChris Mason &defrag_end)) { 719940100a4SChris Mason unsigned long next; 720940100a4SChris Mason /* 721940100a4SChris Mason * the should_defrag function tells us how much to skip 722940100a4SChris Mason * bump our counter by the suggested amount 723940100a4SChris Mason */ 724940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 725940100a4SChris Mason i = max(i + 1, next); 726940100a4SChris Mason continue; 727940100a4SChris Mason } 728940100a4SChris Mason 729f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 730f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 731f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 732f46b5a66SChristoph Hellwig } 733f46b5a66SChristoph Hellwig total_read++; 734940100a4SChris Mason mutex_lock(&inode->i_mutex); 7351e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 7361a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 737940100a4SChris Mason 7380ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 7390ca1f7ceSYan, Zheng if (ret) 7400ca1f7ceSYan, Zheng goto err_unlock; 7413eaa2885SChris Mason again: 742940100a4SChris Mason if (inode->i_size == 0 || 743940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 744940100a4SChris Mason ret = 0; 745940100a4SChris Mason goto err_reservations; 746940100a4SChris Mason } 747940100a4SChris Mason 748f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 7490ca1f7ceSYan, Zheng if (!page) { 7500ca1f7ceSYan, Zheng ret = -ENOMEM; 751940100a4SChris Mason goto err_reservations; 7520ca1f7ceSYan, Zheng } 753940100a4SChris Mason 754f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 755f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 756f46b5a66SChristoph Hellwig lock_page(page); 757f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 758f46b5a66SChristoph Hellwig unlock_page(page); 759f46b5a66SChristoph Hellwig page_cache_release(page); 7600ca1f7ceSYan, Zheng ret = -EIO; 761940100a4SChris Mason goto err_reservations; 762f46b5a66SChristoph Hellwig } 763f46b5a66SChristoph Hellwig } 764f46b5a66SChristoph Hellwig 765940100a4SChris Mason if (page->mapping != inode->i_mapping) { 766940100a4SChris Mason unlock_page(page); 767940100a4SChris Mason page_cache_release(page); 768940100a4SChris Mason goto again; 769940100a4SChris Mason } 770940100a4SChris Mason 771f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 772f46b5a66SChristoph Hellwig 773940100a4SChris Mason if (PageDirty(page)) { 7740ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 775940100a4SChris Mason goto loop_unlock; 776940100a4SChris Mason } 777940100a4SChris Mason 778f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 779f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 780f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 7813eaa2885SChris Mason 7823eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 7833eaa2885SChris Mason if (ordered) { 7843eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 7853eaa2885SChris Mason unlock_page(page); 7863eaa2885SChris Mason page_cache_release(page); 7873eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 7883eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 7893eaa2885SChris Mason goto again; 7903eaa2885SChris Mason } 7913eaa2885SChris Mason set_page_extent_mapped(page); 7923eaa2885SChris Mason 793f87f057bSChris Mason /* 794f87f057bSChris Mason * this makes sure page_mkwrite is called on the 795f87f057bSChris Mason * page if it is dirtied again later 796f87f057bSChris Mason */ 797f87f057bSChris Mason clear_page_dirty_for_io(page); 798940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 799940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 800940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 801f87f057bSChris Mason 8022ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 803940100a4SChris Mason ClearPageChecked(page); 804f46b5a66SChristoph Hellwig set_page_dirty(page); 805a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 806940100a4SChris Mason 807940100a4SChris Mason loop_unlock: 808f46b5a66SChristoph Hellwig unlock_page(page); 809f46b5a66SChristoph Hellwig page_cache_release(page); 810940100a4SChris Mason mutex_unlock(&inode->i_mutex); 811940100a4SChris Mason 812f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 813940100a4SChris Mason i++; 814f46b5a66SChristoph Hellwig } 815f46b5a66SChristoph Hellwig 8161e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 8171e701a32SChris Mason filemap_flush(inode->i_mapping); 8181e701a32SChris Mason 8191e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 8201e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 8211e701a32SChris Mason * we have to make sure the IO is actually started and that 8221e701a32SChris Mason * ordered extents get created before we return 8231e701a32SChris Mason */ 8241e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 8251e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 8261e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 8271e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 8281e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 8291e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 8301e701a32SChris Mason } 8311e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 8321e701a32SChris Mason 8331e701a32SChris Mason mutex_lock(&inode->i_mutex); 834261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 8351e701a32SChris Mason mutex_unlock(&inode->i_mutex); 8361e701a32SChris Mason } 8371e701a32SChris Mason 8381a419d85SLi Zefan disk_super = &root->fs_info->super_copy; 8391a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 8401a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 8411a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 8421a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 8431a419d85SLi Zefan } 8441a419d85SLi Zefan 845f46b5a66SChristoph Hellwig return 0; 846940100a4SChris Mason 847940100a4SChris Mason err_reservations: 8480ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 8490ca1f7ceSYan, Zheng err_unlock: 850940100a4SChris Mason mutex_unlock(&inode->i_mutex); 851940100a4SChris Mason return ret; 852f46b5a66SChristoph Hellwig } 853f46b5a66SChristoph Hellwig 85476dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 85576dda93cSYan, Zheng void __user *arg) 856f46b5a66SChristoph Hellwig { 857f46b5a66SChristoph Hellwig u64 new_size; 858f46b5a66SChristoph Hellwig u64 old_size; 859f46b5a66SChristoph Hellwig u64 devid = 1; 860f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 861f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 862f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 863f46b5a66SChristoph Hellwig char *sizestr; 864f46b5a66SChristoph Hellwig char *devstr = NULL; 865f46b5a66SChristoph Hellwig int ret = 0; 866f46b5a66SChristoph Hellwig int mod = 0; 867f46b5a66SChristoph Hellwig 868c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 869c146afadSYan Zheng return -EROFS; 870c146afadSYan Zheng 871e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 872e441d54dSChris Mason return -EPERM; 873e441d54dSChris Mason 874dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 875dae7b665SLi Zefan if (IS_ERR(vol_args)) 876dae7b665SLi Zefan return PTR_ERR(vol_args); 8775516e595SMark Fasheh 8785516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 879f46b5a66SChristoph Hellwig 8807d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 881f46b5a66SChristoph Hellwig sizestr = vol_args->name; 882f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 883f46b5a66SChristoph Hellwig if (devstr) { 884f46b5a66SChristoph Hellwig char *end; 885f46b5a66SChristoph Hellwig sizestr = devstr + 1; 886f46b5a66SChristoph Hellwig *devstr = '\0'; 887f46b5a66SChristoph Hellwig devstr = vol_args->name; 888f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 88921380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 89021380931SJoel Becker (unsigned long long)devid); 891f46b5a66SChristoph Hellwig } 8922b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 893f46b5a66SChristoph Hellwig if (!device) { 89421380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 89521380931SJoel Becker (unsigned long long)devid); 896f46b5a66SChristoph Hellwig ret = -EINVAL; 897f46b5a66SChristoph Hellwig goto out_unlock; 898f46b5a66SChristoph Hellwig } 899f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 900f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 901f46b5a66SChristoph Hellwig else { 902f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 903f46b5a66SChristoph Hellwig mod = -1; 904f46b5a66SChristoph Hellwig sizestr++; 905f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 906f46b5a66SChristoph Hellwig mod = 1; 907f46b5a66SChristoph Hellwig sizestr++; 908f46b5a66SChristoph Hellwig } 90991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 910f46b5a66SChristoph Hellwig if (new_size == 0) { 911f46b5a66SChristoph Hellwig ret = -EINVAL; 912f46b5a66SChristoph Hellwig goto out_unlock; 913f46b5a66SChristoph Hellwig } 914f46b5a66SChristoph Hellwig } 915f46b5a66SChristoph Hellwig 916f46b5a66SChristoph Hellwig old_size = device->total_bytes; 917f46b5a66SChristoph Hellwig 918f46b5a66SChristoph Hellwig if (mod < 0) { 919f46b5a66SChristoph Hellwig if (new_size > old_size) { 920f46b5a66SChristoph Hellwig ret = -EINVAL; 921f46b5a66SChristoph Hellwig goto out_unlock; 922f46b5a66SChristoph Hellwig } 923f46b5a66SChristoph Hellwig new_size = old_size - new_size; 924f46b5a66SChristoph Hellwig } else if (mod > 0) { 925f46b5a66SChristoph Hellwig new_size = old_size + new_size; 926f46b5a66SChristoph Hellwig } 927f46b5a66SChristoph Hellwig 928f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 929f46b5a66SChristoph Hellwig ret = -EINVAL; 930f46b5a66SChristoph Hellwig goto out_unlock; 931f46b5a66SChristoph Hellwig } 932f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 933f46b5a66SChristoph Hellwig ret = -EFBIG; 934f46b5a66SChristoph Hellwig goto out_unlock; 935f46b5a66SChristoph Hellwig } 936f46b5a66SChristoph Hellwig 937f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 938f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 939f46b5a66SChristoph Hellwig 940f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 941f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 942f46b5a66SChristoph Hellwig 943f46b5a66SChristoph Hellwig if (new_size > old_size) { 944a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 94598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 94698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 94798d5dc13STsutomu Itoh goto out_unlock; 94898d5dc13STsutomu Itoh } 949f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 950f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 951f46b5a66SChristoph Hellwig } else { 952f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 953f46b5a66SChristoph Hellwig } 954f46b5a66SChristoph Hellwig 955f46b5a66SChristoph Hellwig out_unlock: 9567d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 957f46b5a66SChristoph Hellwig kfree(vol_args); 958f46b5a66SChristoph Hellwig return ret; 959f46b5a66SChristoph Hellwig } 960f46b5a66SChristoph Hellwig 96172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 96272fd032eSSage Weil char *name, 96372fd032eSSage Weil unsigned long fd, 96472fd032eSSage Weil int subvol, 965b83cc969SLi Zefan u64 *transid, 966b83cc969SLi Zefan bool readonly) 967f46b5a66SChristoph Hellwig { 968cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 9693de4586cSChris Mason struct file *src_file; 970f46b5a66SChristoph Hellwig int namelen; 9713de4586cSChris Mason int ret = 0; 972f46b5a66SChristoph Hellwig 973c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 974c146afadSYan Zheng return -EROFS; 975c146afadSYan Zheng 97672fd032eSSage Weil namelen = strlen(name); 97772fd032eSSage Weil if (strchr(name, '/')) { 978f46b5a66SChristoph Hellwig ret = -EINVAL; 979f46b5a66SChristoph Hellwig goto out; 980f46b5a66SChristoph Hellwig } 981f46b5a66SChristoph Hellwig 9823de4586cSChris Mason if (subvol) { 98372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 984b83cc969SLi Zefan NULL, transid, readonly); 985cb8e7090SChristoph Hellwig } else { 9863de4586cSChris Mason struct inode *src_inode; 98772fd032eSSage Weil src_file = fget(fd); 9883de4586cSChris Mason if (!src_file) { 9893de4586cSChris Mason ret = -EINVAL; 9903de4586cSChris Mason goto out; 9913de4586cSChris Mason } 9923de4586cSChris Mason 9933de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 9943de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 995d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 996d397712bSChris Mason "another FS\n"); 9973de4586cSChris Mason ret = -EINVAL; 9983de4586cSChris Mason fput(src_file); 9993de4586cSChris Mason goto out; 10003de4586cSChris Mason } 100172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 100272fd032eSSage Weil BTRFS_I(src_inode)->root, 1003b83cc969SLi Zefan transid, readonly); 10043de4586cSChris Mason fput(src_file); 1005cb8e7090SChristoph Hellwig } 1006f46b5a66SChristoph Hellwig out: 100772fd032eSSage Weil return ret; 100872fd032eSSage Weil } 100972fd032eSSage Weil 101072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1011fa0d2b9bSLi Zefan void __user *arg, int subvol) 101272fd032eSSage Weil { 1013fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 101472fd032eSSage Weil int ret; 101572fd032eSSage Weil 1016fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1017fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1018fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1019fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1020fa0d2b9bSLi Zefan 1021fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1022b83cc969SLi Zefan vol_args->fd, subvol, 1023b83cc969SLi Zefan NULL, false); 1024fa0d2b9bSLi Zefan 1025fa0d2b9bSLi Zefan kfree(vol_args); 1026fa0d2b9bSLi Zefan return ret; 1027fa0d2b9bSLi Zefan } 1028fa0d2b9bSLi Zefan 1029fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1030fa0d2b9bSLi Zefan void __user *arg, int subvol) 1031fa0d2b9bSLi Zefan { 1032fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1033fa0d2b9bSLi Zefan int ret; 1034fdfb1e4fSLi Zefan u64 transid = 0; 1035fdfb1e4fSLi Zefan u64 *ptr = NULL; 1036b83cc969SLi Zefan bool readonly = false; 103772fd032eSSage Weil 1038fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1039fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1040fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1041fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1042fdfb1e4fSLi Zefan 1043b83cc969SLi Zefan if (vol_args->flags & 1044b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1045b83cc969SLi Zefan ret = -EOPNOTSUPP; 1046fdfb1e4fSLi Zefan goto out; 1047fdfb1e4fSLi Zefan } 1048fdfb1e4fSLi Zefan 1049fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1050fdfb1e4fSLi Zefan ptr = &transid; 1051b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1052b83cc969SLi Zefan readonly = true; 105375eaa0e2SSage Weil 1054fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1055b83cc969SLi Zefan vol_args->fd, subvol, 1056b83cc969SLi Zefan ptr, readonly); 105775eaa0e2SSage Weil 1058fdfb1e4fSLi Zefan if (ret == 0 && ptr && 105975eaa0e2SSage Weil copy_to_user(arg + 1060fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1061fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 106275eaa0e2SSage Weil ret = -EFAULT; 1063fdfb1e4fSLi Zefan out: 1064f46b5a66SChristoph Hellwig kfree(vol_args); 1065f46b5a66SChristoph Hellwig return ret; 1066f46b5a66SChristoph Hellwig } 1067f46b5a66SChristoph Hellwig 10680caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 10690caa102dSLi Zefan void __user *arg) 10700caa102dSLi Zefan { 10710caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 10720caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 10730caa102dSLi Zefan int ret = 0; 10740caa102dSLi Zefan u64 flags = 0; 10750caa102dSLi Zefan 10760caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 10770caa102dSLi Zefan return -EINVAL; 10780caa102dSLi Zefan 10790caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 10800caa102dSLi Zefan if (btrfs_root_readonly(root)) 10810caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 10820caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 10830caa102dSLi Zefan 10840caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 10850caa102dSLi Zefan ret = -EFAULT; 10860caa102dSLi Zefan 10870caa102dSLi Zefan return ret; 10880caa102dSLi Zefan } 10890caa102dSLi Zefan 10900caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 10910caa102dSLi Zefan void __user *arg) 10920caa102dSLi Zefan { 10930caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 10940caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 10950caa102dSLi Zefan struct btrfs_trans_handle *trans; 10960caa102dSLi Zefan u64 root_flags; 10970caa102dSLi Zefan u64 flags; 10980caa102dSLi Zefan int ret = 0; 10990caa102dSLi Zefan 11000caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 11010caa102dSLi Zefan return -EROFS; 11020caa102dSLi Zefan 11030caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11040caa102dSLi Zefan return -EINVAL; 11050caa102dSLi Zefan 11060caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 11070caa102dSLi Zefan return -EFAULT; 11080caa102dSLi Zefan 1109b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 11100caa102dSLi Zefan return -EINVAL; 11110caa102dSLi Zefan 11120caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 11130caa102dSLi Zefan return -EOPNOTSUPP; 11140caa102dSLi Zefan 1115b4dc2b8cSLi Zefan if (!is_owner_or_cap(inode)) 1116b4dc2b8cSLi Zefan return -EACCES; 1117b4dc2b8cSLi Zefan 11180caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 11190caa102dSLi Zefan 11200caa102dSLi Zefan /* nothing to do */ 11210caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 11220caa102dSLi Zefan goto out; 11230caa102dSLi Zefan 11240caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 11250caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 11260caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11270caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 11280caa102dSLi Zefan else 11290caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11300caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 11310caa102dSLi Zefan 11320caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 11330caa102dSLi Zefan if (IS_ERR(trans)) { 11340caa102dSLi Zefan ret = PTR_ERR(trans); 11350caa102dSLi Zefan goto out_reset; 11360caa102dSLi Zefan } 11370caa102dSLi Zefan 1138b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 11390caa102dSLi Zefan &root->root_key, &root->root_item); 11400caa102dSLi Zefan 11410caa102dSLi Zefan btrfs_commit_transaction(trans, root); 11420caa102dSLi Zefan out_reset: 11430caa102dSLi Zefan if (ret) 11440caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 11450caa102dSLi Zefan out: 11460caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 11470caa102dSLi Zefan return ret; 11480caa102dSLi Zefan } 11490caa102dSLi Zefan 115076dda93cSYan, Zheng /* 115176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 115276dda93cSYan, Zheng */ 115376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 115476dda93cSYan, Zheng { 115576dda93cSYan, Zheng struct btrfs_path *path; 115676dda93cSYan, Zheng struct btrfs_key key; 115776dda93cSYan, Zheng int ret; 115876dda93cSYan, Zheng 115976dda93cSYan, Zheng path = btrfs_alloc_path(); 116076dda93cSYan, Zheng if (!path) 116176dda93cSYan, Zheng return -ENOMEM; 116276dda93cSYan, Zheng 116376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 116476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 116576dda93cSYan, Zheng key.offset = (u64)-1; 116676dda93cSYan, Zheng 116776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 116876dda93cSYan, Zheng &key, path, 0, 0); 116976dda93cSYan, Zheng if (ret < 0) 117076dda93cSYan, Zheng goto out; 117176dda93cSYan, Zheng BUG_ON(ret == 0); 117276dda93cSYan, Zheng 117376dda93cSYan, Zheng ret = 0; 117476dda93cSYan, Zheng if (path->slots[0] > 0) { 117576dda93cSYan, Zheng path->slots[0]--; 117676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 117776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 117876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 117976dda93cSYan, Zheng ret = -ENOTEMPTY; 118076dda93cSYan, Zheng } 118176dda93cSYan, Zheng out: 118276dda93cSYan, Zheng btrfs_free_path(path); 118376dda93cSYan, Zheng return ret; 118476dda93cSYan, Zheng } 118576dda93cSYan, Zheng 1186ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1187ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1188ac8e9819SChris Mason { 1189abc6e134SChris Mason struct btrfs_key test; 1190abc6e134SChris Mason int ret; 1191abc6e134SChris Mason 1192abc6e134SChris Mason test.objectid = sk->min_objectid; 1193abc6e134SChris Mason test.type = sk->min_type; 1194abc6e134SChris Mason test.offset = sk->min_offset; 1195abc6e134SChris Mason 1196abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1197abc6e134SChris Mason if (ret < 0) 1198ac8e9819SChris Mason return 0; 1199abc6e134SChris Mason 1200abc6e134SChris Mason test.objectid = sk->max_objectid; 1201abc6e134SChris Mason test.type = sk->max_type; 1202abc6e134SChris Mason test.offset = sk->max_offset; 1203abc6e134SChris Mason 1204abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1205abc6e134SChris Mason if (ret > 0) 1206ac8e9819SChris Mason return 0; 1207ac8e9819SChris Mason return 1; 1208ac8e9819SChris Mason } 1209ac8e9819SChris Mason 1210ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1211ac8e9819SChris Mason struct btrfs_path *path, 1212ac8e9819SChris Mason struct btrfs_key *key, 1213ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1214ac8e9819SChris Mason char *buf, 1215ac8e9819SChris Mason unsigned long *sk_offset, 1216ac8e9819SChris Mason int *num_found) 1217ac8e9819SChris Mason { 1218ac8e9819SChris Mason u64 found_transid; 1219ac8e9819SChris Mason struct extent_buffer *leaf; 1220ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1221ac8e9819SChris Mason unsigned long item_off; 1222ac8e9819SChris Mason unsigned long item_len; 1223ac8e9819SChris Mason int nritems; 1224ac8e9819SChris Mason int i; 1225ac8e9819SChris Mason int slot; 1226ac8e9819SChris Mason int found = 0; 1227ac8e9819SChris Mason int ret = 0; 1228ac8e9819SChris Mason 1229ac8e9819SChris Mason leaf = path->nodes[0]; 1230ac8e9819SChris Mason slot = path->slots[0]; 1231ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1232ac8e9819SChris Mason 1233ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1234ac8e9819SChris Mason i = nritems; 1235ac8e9819SChris Mason goto advance_key; 1236ac8e9819SChris Mason } 1237ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1238ac8e9819SChris Mason 1239ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1240ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1241ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1242ac8e9819SChris Mason 1243ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1244ac8e9819SChris Mason item_len = 0; 1245ac8e9819SChris Mason 1246ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1247ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1248ac8e9819SChris Mason ret = 1; 1249ac8e9819SChris Mason goto overflow; 1250ac8e9819SChris Mason } 1251ac8e9819SChris Mason 1252ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1253ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1254ac8e9819SChris Mason continue; 1255ac8e9819SChris Mason 1256ac8e9819SChris Mason sh.objectid = key->objectid; 1257ac8e9819SChris Mason sh.offset = key->offset; 1258ac8e9819SChris Mason sh.type = key->type; 1259ac8e9819SChris Mason sh.len = item_len; 1260ac8e9819SChris Mason sh.transid = found_transid; 1261ac8e9819SChris Mason 1262ac8e9819SChris Mason /* copy search result header */ 1263ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1264ac8e9819SChris Mason *sk_offset += sizeof(sh); 1265ac8e9819SChris Mason 1266ac8e9819SChris Mason if (item_len) { 1267ac8e9819SChris Mason char *p = buf + *sk_offset; 1268ac8e9819SChris Mason /* copy the item */ 1269ac8e9819SChris Mason read_extent_buffer(leaf, p, 1270ac8e9819SChris Mason item_off, item_len); 1271ac8e9819SChris Mason *sk_offset += item_len; 1272ac8e9819SChris Mason } 127390fdde14SChris Mason found++; 1274ac8e9819SChris Mason 1275ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1276ac8e9819SChris Mason break; 1277ac8e9819SChris Mason } 1278ac8e9819SChris Mason advance_key: 1279ac8e9819SChris Mason ret = 0; 1280abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1281abc6e134SChris Mason key->offset++; 1282abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1283abc6e134SChris Mason key->offset = 0; 1284abc6e134SChris Mason key->type++; 1285abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1286abc6e134SChris Mason key->offset = 0; 1287abc6e134SChris Mason key->type = 0; 1288abc6e134SChris Mason key->objectid++; 1289abc6e134SChris Mason } else 1290abc6e134SChris Mason ret = 1; 1291ac8e9819SChris Mason overflow: 1292ac8e9819SChris Mason *num_found += found; 1293ac8e9819SChris Mason return ret; 1294ac8e9819SChris Mason } 1295ac8e9819SChris Mason 1296ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1297ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1298ac8e9819SChris Mason { 1299ac8e9819SChris Mason struct btrfs_root *root; 1300ac8e9819SChris Mason struct btrfs_key key; 1301ac8e9819SChris Mason struct btrfs_key max_key; 1302ac8e9819SChris Mason struct btrfs_path *path; 1303ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1304ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1305ac8e9819SChris Mason int ret; 1306ac8e9819SChris Mason int num_found = 0; 1307ac8e9819SChris Mason unsigned long sk_offset = 0; 1308ac8e9819SChris Mason 1309ac8e9819SChris Mason path = btrfs_alloc_path(); 1310ac8e9819SChris Mason if (!path) 1311ac8e9819SChris Mason return -ENOMEM; 1312ac8e9819SChris Mason 1313ac8e9819SChris Mason if (sk->tree_id == 0) { 1314ac8e9819SChris Mason /* search the root of the inode that was passed */ 1315ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1316ac8e9819SChris Mason } else { 1317ac8e9819SChris Mason key.objectid = sk->tree_id; 1318ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1319ac8e9819SChris Mason key.offset = (u64)-1; 1320ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1321ac8e9819SChris Mason if (IS_ERR(root)) { 1322ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1323ac8e9819SChris Mason sk->tree_id); 1324ac8e9819SChris Mason btrfs_free_path(path); 1325ac8e9819SChris Mason return -ENOENT; 1326ac8e9819SChris Mason } 1327ac8e9819SChris Mason } 1328ac8e9819SChris Mason 1329ac8e9819SChris Mason key.objectid = sk->min_objectid; 1330ac8e9819SChris Mason key.type = sk->min_type; 1331ac8e9819SChris Mason key.offset = sk->min_offset; 1332ac8e9819SChris Mason 1333ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1334ac8e9819SChris Mason max_key.type = sk->max_type; 1335ac8e9819SChris Mason max_key.offset = sk->max_offset; 1336ac8e9819SChris Mason 1337ac8e9819SChris Mason path->keep_locks = 1; 1338ac8e9819SChris Mason 1339ac8e9819SChris Mason while(1) { 1340ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1341ac8e9819SChris Mason sk->min_transid); 1342ac8e9819SChris Mason if (ret != 0) { 1343ac8e9819SChris Mason if (ret > 0) 1344ac8e9819SChris Mason ret = 0; 1345ac8e9819SChris Mason goto err; 1346ac8e9819SChris Mason } 1347ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1348ac8e9819SChris Mason &sk_offset, &num_found); 1349ac8e9819SChris Mason btrfs_release_path(root, path); 1350ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1351ac8e9819SChris Mason break; 1352ac8e9819SChris Mason 1353ac8e9819SChris Mason } 1354ac8e9819SChris Mason ret = 0; 1355ac8e9819SChris Mason err: 1356ac8e9819SChris Mason sk->nr_items = num_found; 1357ac8e9819SChris Mason btrfs_free_path(path); 1358ac8e9819SChris Mason return ret; 1359ac8e9819SChris Mason } 1360ac8e9819SChris Mason 1361ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1362ac8e9819SChris Mason void __user *argp) 1363ac8e9819SChris Mason { 1364ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1365ac8e9819SChris Mason struct inode *inode; 1366ac8e9819SChris Mason int ret; 1367ac8e9819SChris Mason 1368ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1369ac8e9819SChris Mason return -EPERM; 1370ac8e9819SChris Mason 13712354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 13722354d08fSJulia Lawall if (IS_ERR(args)) 13732354d08fSJulia Lawall return PTR_ERR(args); 1374ac8e9819SChris Mason 1375ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1376ac8e9819SChris Mason ret = search_ioctl(inode, args); 1377ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1378ac8e9819SChris Mason ret = -EFAULT; 1379ac8e9819SChris Mason kfree(args); 1380ac8e9819SChris Mason return ret; 1381ac8e9819SChris Mason } 1382ac8e9819SChris Mason 138398d377a0STARUISI Hiroaki /* 1384ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1385ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 138698d377a0STARUISI Hiroaki */ 138798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 138898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 138998d377a0STARUISI Hiroaki { 139098d377a0STARUISI Hiroaki struct btrfs_root *root; 139198d377a0STARUISI Hiroaki struct btrfs_key key; 1392ac8e9819SChris Mason char *ptr; 139398d377a0STARUISI Hiroaki int ret = -1; 139498d377a0STARUISI Hiroaki int slot; 139598d377a0STARUISI Hiroaki int len; 139698d377a0STARUISI Hiroaki int total_len = 0; 139798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 139898d377a0STARUISI Hiroaki struct extent_buffer *l; 139998d377a0STARUISI Hiroaki struct btrfs_path *path; 140098d377a0STARUISI Hiroaki 140198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 140298d377a0STARUISI Hiroaki name[0]='\0'; 140398d377a0STARUISI Hiroaki return 0; 140498d377a0STARUISI Hiroaki } 140598d377a0STARUISI Hiroaki 140698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 140798d377a0STARUISI Hiroaki if (!path) 140898d377a0STARUISI Hiroaki return -ENOMEM; 140998d377a0STARUISI Hiroaki 1410ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 141198d377a0STARUISI Hiroaki 141298d377a0STARUISI Hiroaki key.objectid = tree_id; 141398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 141498d377a0STARUISI Hiroaki key.offset = (u64)-1; 141598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 141698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 141798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 14188ad6fcabSChris Mason ret = -ENOENT; 14198ad6fcabSChris Mason goto out; 142098d377a0STARUISI Hiroaki } 142198d377a0STARUISI Hiroaki 142298d377a0STARUISI Hiroaki key.objectid = dirid; 142398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 14248ad6fcabSChris Mason key.offset = (u64)-1; 142598d377a0STARUISI Hiroaki 142698d377a0STARUISI Hiroaki while(1) { 142798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 142898d377a0STARUISI Hiroaki if (ret < 0) 142998d377a0STARUISI Hiroaki goto out; 143098d377a0STARUISI Hiroaki 143198d377a0STARUISI Hiroaki l = path->nodes[0]; 143298d377a0STARUISI Hiroaki slot = path->slots[0]; 14338ad6fcabSChris Mason if (ret > 0 && slot > 0) 14348ad6fcabSChris Mason slot--; 143598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 143698d377a0STARUISI Hiroaki 143798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1438ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1439ac8e9819SChris Mason ret = -ENOENT; 144098d377a0STARUISI Hiroaki goto out; 1441ac8e9819SChris Mason } 144298d377a0STARUISI Hiroaki 144398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 144498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 144598d377a0STARUISI Hiroaki ptr -= len + 1; 144698d377a0STARUISI Hiroaki total_len += len + 1; 1447ac8e9819SChris Mason if (ptr < name) 144898d377a0STARUISI Hiroaki goto out; 144998d377a0STARUISI Hiroaki 145098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 145198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 145298d377a0STARUISI Hiroaki 145398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 145498d377a0STARUISI Hiroaki break; 145598d377a0STARUISI Hiroaki 145698d377a0STARUISI Hiroaki btrfs_release_path(root, path); 145798d377a0STARUISI Hiroaki key.objectid = key.offset; 14588ad6fcabSChris Mason key.offset = (u64)-1; 145998d377a0STARUISI Hiroaki dirid = key.objectid; 146098d377a0STARUISI Hiroaki 146198d377a0STARUISI Hiroaki } 1462ac8e9819SChris Mason if (ptr < name) 146398d377a0STARUISI Hiroaki goto out; 1464ac8e9819SChris Mason memcpy(name, ptr, total_len); 146598d377a0STARUISI Hiroaki name[total_len]='\0'; 146698d377a0STARUISI Hiroaki ret = 0; 146798d377a0STARUISI Hiroaki out: 146898d377a0STARUISI Hiroaki btrfs_free_path(path); 1469ac8e9819SChris Mason return ret; 1470ac8e9819SChris Mason } 1471ac8e9819SChris Mason 1472ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1473ac8e9819SChris Mason void __user *argp) 1474ac8e9819SChris Mason { 1475ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1476ac8e9819SChris Mason struct inode *inode; 1477ac8e9819SChris Mason int ret; 1478ac8e9819SChris Mason 1479ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1480ac8e9819SChris Mason return -EPERM; 1481ac8e9819SChris Mason 14822354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 14832354d08fSJulia Lawall if (IS_ERR(args)) 14842354d08fSJulia Lawall return PTR_ERR(args); 1485c2b96929SDan Carpenter 1486ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1487ac8e9819SChris Mason 14881b53ac4dSChris Mason if (args->treeid == 0) 14891b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 14901b53ac4dSChris Mason 1491ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1492ac8e9819SChris Mason args->treeid, args->objectid, 1493ac8e9819SChris Mason args->name); 1494ac8e9819SChris Mason 1495ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1496ac8e9819SChris Mason ret = -EFAULT; 1497ac8e9819SChris Mason 1498ac8e9819SChris Mason kfree(args); 149998d377a0STARUISI Hiroaki return ret; 150098d377a0STARUISI Hiroaki } 150198d377a0STARUISI Hiroaki 150276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 150376dda93cSYan, Zheng void __user *arg) 150476dda93cSYan, Zheng { 150576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 150676dda93cSYan, Zheng struct dentry *dentry; 150776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 150876dda93cSYan, Zheng struct inode *inode; 150976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 151076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 151176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 151276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 151376dda93cSYan, Zheng int namelen; 151476dda93cSYan, Zheng int ret; 151576dda93cSYan, Zheng int err = 0; 151676dda93cSYan, Zheng 151776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 151876dda93cSYan, Zheng if (IS_ERR(vol_args)) 151976dda93cSYan, Zheng return PTR_ERR(vol_args); 152076dda93cSYan, Zheng 152176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 152276dda93cSYan, Zheng namelen = strlen(vol_args->name); 152376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 152476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 152576dda93cSYan, Zheng err = -EINVAL; 152676dda93cSYan, Zheng goto out; 152776dda93cSYan, Zheng } 152876dda93cSYan, Zheng 152976dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 153076dda93cSYan, Zheng if (err) 153176dda93cSYan, Zheng goto out; 153276dda93cSYan, Zheng 153376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 153476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 153576dda93cSYan, Zheng if (IS_ERR(dentry)) { 153676dda93cSYan, Zheng err = PTR_ERR(dentry); 153776dda93cSYan, Zheng goto out_unlock_dir; 153876dda93cSYan, Zheng } 153976dda93cSYan, Zheng 154076dda93cSYan, Zheng if (!dentry->d_inode) { 154176dda93cSYan, Zheng err = -ENOENT; 154276dda93cSYan, Zheng goto out_dput; 154376dda93cSYan, Zheng } 154476dda93cSYan, Zheng 154576dda93cSYan, Zheng inode = dentry->d_inode; 15464260f7c7SSage Weil dest = BTRFS_I(inode)->root; 15474260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 15484260f7c7SSage Weil /* 15494260f7c7SSage Weil * Regular user. Only allow this with a special mount 15504260f7c7SSage Weil * option, when the user has write+exec access to the 15514260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 15524260f7c7SSage Weil * allowed. 15534260f7c7SSage Weil * 15544260f7c7SSage Weil * Note that this is _not_ check that the subvol is 15554260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 15564260f7c7SSage Weil * otherwise be able to delete. 15574260f7c7SSage Weil * 15584260f7c7SSage Weil * Users who want to delete empty subvols should try 15594260f7c7SSage Weil * rmdir(2). 15604260f7c7SSage Weil */ 15614260f7c7SSage Weil err = -EPERM; 15624260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 15634260f7c7SSage Weil goto out_dput; 15644260f7c7SSage Weil 15654260f7c7SSage Weil /* 15664260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 15674260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 15684260f7c7SSage Weil * must be called on the dentry referencing the root 15694260f7c7SSage Weil * of the subvol, not a random directory contained 15704260f7c7SSage Weil * within it. 15714260f7c7SSage Weil */ 15724260f7c7SSage Weil err = -EINVAL; 15734260f7c7SSage Weil if (root == dest) 15744260f7c7SSage Weil goto out_dput; 15754260f7c7SSage Weil 15764260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 15774260f7c7SSage Weil if (err) 15784260f7c7SSage Weil goto out_dput; 15794260f7c7SSage Weil 15804260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 15814260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 15824260f7c7SSage Weil if (err) 15834260f7c7SSage Weil goto out_dput; 15844260f7c7SSage Weil } 15854260f7c7SSage Weil 158676dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 158776dda93cSYan, Zheng err = -EINVAL; 158876dda93cSYan, Zheng goto out_dput; 158976dda93cSYan, Zheng } 159076dda93cSYan, Zheng 159176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 159276dda93cSYan, Zheng err = d_invalidate(dentry); 159376dda93cSYan, Zheng if (err) 159476dda93cSYan, Zheng goto out_unlock; 159576dda93cSYan, Zheng 159676dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 159776dda93cSYan, Zheng 159876dda93cSYan, Zheng err = may_destroy_subvol(dest); 159976dda93cSYan, Zheng if (err) 160076dda93cSYan, Zheng goto out_up_write; 160176dda93cSYan, Zheng 1602a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1603a22285a6SYan, Zheng if (IS_ERR(trans)) { 1604a22285a6SYan, Zheng err = PTR_ERR(trans); 1605d327099aSDan Carpenter goto out_up_write; 1606a22285a6SYan, Zheng } 1607a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1608a22285a6SYan, Zheng 160976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 161076dda93cSYan, Zheng dest->root_key.objectid, 161176dda93cSYan, Zheng dentry->d_name.name, 161276dda93cSYan, Zheng dentry->d_name.len); 161376dda93cSYan, Zheng BUG_ON(ret); 161476dda93cSYan, Zheng 161576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 161676dda93cSYan, Zheng 161776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 161876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 161976dda93cSYan, Zheng dest->root_item.drop_level = 0; 162076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 162176dda93cSYan, Zheng 1622d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 162376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 162476dda93cSYan, Zheng root->fs_info->tree_root, 162576dda93cSYan, Zheng dest->root_key.objectid); 162676dda93cSYan, Zheng BUG_ON(ret); 1627d68fc57bSYan, Zheng } 162876dda93cSYan, Zheng 1629531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 163076dda93cSYan, Zheng BUG_ON(ret); 163176dda93cSYan, Zheng inode->i_flags |= S_DEAD; 163276dda93cSYan, Zheng out_up_write: 163376dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 163476dda93cSYan, Zheng out_unlock: 163576dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 163676dda93cSYan, Zheng if (!err) { 1637efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 163876dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 163976dda93cSYan, Zheng d_delete(dentry); 164076dda93cSYan, Zheng } 164176dda93cSYan, Zheng out_dput: 164276dda93cSYan, Zheng dput(dentry); 164376dda93cSYan, Zheng out_unlock_dir: 164476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 164576dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 164676dda93cSYan, Zheng out: 164776dda93cSYan, Zheng kfree(vol_args); 164876dda93cSYan, Zheng return err; 164976dda93cSYan, Zheng } 165076dda93cSYan, Zheng 16511e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1652f46b5a66SChristoph Hellwig { 1653f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1654f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 16551e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1656c146afadSYan Zheng int ret; 1657c146afadSYan Zheng 1658b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1659b83cc969SLi Zefan return -EROFS; 1660b83cc969SLi Zefan 1661c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1662c146afadSYan Zheng if (ret) 1663c146afadSYan Zheng return ret; 1664f46b5a66SChristoph Hellwig 1665f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1666f46b5a66SChristoph Hellwig case S_IFDIR: 1667e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1668e441d54dSChris Mason ret = -EPERM; 1669e441d54dSChris Mason goto out; 1670e441d54dSChris Mason } 16718929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 16728929ecfaSYan, Zheng if (ret) 16738929ecfaSYan, Zheng goto out; 16748929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1675f46b5a66SChristoph Hellwig break; 1676f46b5a66SChristoph Hellwig case S_IFREG: 1677e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1678e441d54dSChris Mason ret = -EINVAL; 1679e441d54dSChris Mason goto out; 1680e441d54dSChris Mason } 16811e701a32SChris Mason 16821e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 16831e701a32SChris Mason if (!range) { 16841e701a32SChris Mason ret = -ENOMEM; 16851e701a32SChris Mason goto out; 16861e701a32SChris Mason } 16871e701a32SChris Mason 16881e701a32SChris Mason if (argp) { 16891e701a32SChris Mason if (copy_from_user(range, argp, 16901e701a32SChris Mason sizeof(*range))) { 16911e701a32SChris Mason ret = -EFAULT; 16921e701a32SChris Mason kfree(range); 1693683be16eSDan Carpenter goto out; 16941e701a32SChris Mason } 16951e701a32SChris Mason /* compression requires us to start the IO */ 16961e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 16971e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 16981e701a32SChris Mason range->extent_thresh = (u32)-1; 16991e701a32SChris Mason } 17001e701a32SChris Mason } else { 17011e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 17021e701a32SChris Mason range->len = (u64)-1; 17031e701a32SChris Mason } 17048929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 17051e701a32SChris Mason kfree(range); 1706f46b5a66SChristoph Hellwig break; 17078929ecfaSYan, Zheng default: 17088929ecfaSYan, Zheng ret = -EINVAL; 1709f46b5a66SChristoph Hellwig } 1710e441d54dSChris Mason out: 1711ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1712e441d54dSChris Mason return ret; 1713f46b5a66SChristoph Hellwig } 1714f46b5a66SChristoph Hellwig 1715b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1716f46b5a66SChristoph Hellwig { 1717f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1718f46b5a66SChristoph Hellwig int ret; 1719f46b5a66SChristoph Hellwig 1720e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1721e441d54dSChris Mason return -EPERM; 1722e441d54dSChris Mason 1723dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1724dae7b665SLi Zefan if (IS_ERR(vol_args)) 1725dae7b665SLi Zefan return PTR_ERR(vol_args); 1726f46b5a66SChristoph Hellwig 17275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1728f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1729f46b5a66SChristoph Hellwig 1730f46b5a66SChristoph Hellwig kfree(vol_args); 1731f46b5a66SChristoph Hellwig return ret; 1732f46b5a66SChristoph Hellwig } 1733f46b5a66SChristoph Hellwig 1734b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1735f46b5a66SChristoph Hellwig { 1736f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1737f46b5a66SChristoph Hellwig int ret; 1738f46b5a66SChristoph Hellwig 1739e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1740e441d54dSChris Mason return -EPERM; 1741e441d54dSChris Mason 1742c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1743c146afadSYan Zheng return -EROFS; 1744c146afadSYan Zheng 1745dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1746dae7b665SLi Zefan if (IS_ERR(vol_args)) 1747dae7b665SLi Zefan return PTR_ERR(vol_args); 1748f46b5a66SChristoph Hellwig 17495516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1750f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1751f46b5a66SChristoph Hellwig 1752f46b5a66SChristoph Hellwig kfree(vol_args); 1753f46b5a66SChristoph Hellwig return ret; 1754f46b5a66SChristoph Hellwig } 1755f46b5a66SChristoph Hellwig 175676dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1757b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1758f46b5a66SChristoph Hellwig { 1759f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1760f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1761f46b5a66SChristoph Hellwig struct file *src_file; 1762f46b5a66SChristoph Hellwig struct inode *src; 1763f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1764f46b5a66SChristoph Hellwig struct btrfs_path *path; 1765f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1766ae01a0abSYan Zheng char *buf; 1767ae01a0abSYan Zheng struct btrfs_key key; 1768f46b5a66SChristoph Hellwig u32 nritems; 1769f46b5a66SChristoph Hellwig int slot; 1770ae01a0abSYan Zheng int ret; 1771c5c9cd4dSSage Weil u64 len = olen; 1772c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1773c5c9cd4dSSage Weil u64 hint_byte; 1774d20f7043SChris Mason 1775c5c9cd4dSSage Weil /* 1776c5c9cd4dSSage Weil * TODO: 1777c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1778c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1779c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1780c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1781c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1782c5c9cd4dSSage Weil * they don't overlap)? 1783c5c9cd4dSSage Weil */ 1784c5c9cd4dSSage Weil 1785e441d54dSChris Mason /* the destination must be opened for writing */ 17862ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1787e441d54dSChris Mason return -EINVAL; 1788e441d54dSChris Mason 1789b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1790b83cc969SLi Zefan return -EROFS; 1791b83cc969SLi Zefan 1792c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1793c146afadSYan Zheng if (ret) 1794c146afadSYan Zheng return ret; 1795c146afadSYan Zheng 1796c5c9cd4dSSage Weil src_file = fget(srcfd); 1797ab67b7c1SYan Zheng if (!src_file) { 1798ab67b7c1SYan Zheng ret = -EBADF; 1799ab67b7c1SYan Zheng goto out_drop_write; 1800ab67b7c1SYan Zheng } 18015dc64164SDan Rosenberg 1802f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1803f46b5a66SChristoph Hellwig 1804c5c9cd4dSSage Weil ret = -EINVAL; 1805c5c9cd4dSSage Weil if (src == inode) 1806c5c9cd4dSSage Weil goto out_fput; 1807c5c9cd4dSSage Weil 18085dc64164SDan Rosenberg /* the src must be open for reading */ 18095dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 18105dc64164SDan Rosenberg goto out_fput; 18115dc64164SDan Rosenberg 1812ae01a0abSYan Zheng ret = -EISDIR; 1813ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1814f46b5a66SChristoph Hellwig goto out_fput; 1815f46b5a66SChristoph Hellwig 1816ae01a0abSYan Zheng ret = -EXDEV; 1817ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1818ae01a0abSYan Zheng goto out_fput; 1819ae01a0abSYan Zheng 1820ae01a0abSYan Zheng ret = -ENOMEM; 1821ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1822ae01a0abSYan Zheng if (!buf) 1823ae01a0abSYan Zheng goto out_fput; 1824ae01a0abSYan Zheng 1825ae01a0abSYan Zheng path = btrfs_alloc_path(); 1826ae01a0abSYan Zheng if (!path) { 1827ae01a0abSYan Zheng vfree(buf); 1828ae01a0abSYan Zheng goto out_fput; 1829ae01a0abSYan Zheng } 1830ae01a0abSYan Zheng path->reada = 2; 1831ae01a0abSYan Zheng 1832f46b5a66SChristoph Hellwig if (inode < src) { 1833fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1834fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1835f46b5a66SChristoph Hellwig } else { 1836fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1837fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1838f46b5a66SChristoph Hellwig } 1839f46b5a66SChristoph Hellwig 1840c5c9cd4dSSage Weil /* determine range to clone */ 1841c5c9cd4dSSage Weil ret = -EINVAL; 18422ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1843f46b5a66SChristoph Hellwig goto out_unlock; 1844c5c9cd4dSSage Weil if (len == 0) 1845c5c9cd4dSSage Weil olen = len = src->i_size - off; 1846c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1847c5c9cd4dSSage Weil if (off + len == src->i_size) 18482a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1849c5c9cd4dSSage Weil 1850c5c9cd4dSSage Weil /* verify the end result is block aligned */ 18512a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 18522a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1853c5c9cd4dSSage Weil goto out_unlock; 1854c5c9cd4dSSage Weil 1855f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1856f46b5a66SChristoph Hellwig another, and lock file content */ 1857f46b5a66SChristoph Hellwig while (1) { 185831840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1859c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 18609a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 18619a019196SSage Weil if (!ordered && 18629a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 18639a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1864f46b5a66SChristoph Hellwig break; 1865c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1866ae01a0abSYan Zheng if (ordered) 1867ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 18689a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1869f46b5a66SChristoph Hellwig } 1870f46b5a66SChristoph Hellwig 1871c5c9cd4dSSage Weil /* clone data */ 1872f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1873ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1874ae01a0abSYan Zheng key.offset = 0; 1875f46b5a66SChristoph Hellwig 1876f46b5a66SChristoph Hellwig while (1) { 1877f46b5a66SChristoph Hellwig /* 1878f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1879f46b5a66SChristoph Hellwig * tree. 1880f46b5a66SChristoph Hellwig */ 1881a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1882f46b5a66SChristoph Hellwig if (ret < 0) 1883f46b5a66SChristoph Hellwig goto out; 1884f46b5a66SChristoph Hellwig 1885ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1886ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1887f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1888f46b5a66SChristoph Hellwig if (ret < 0) 1889f46b5a66SChristoph Hellwig goto out; 1890f46b5a66SChristoph Hellwig if (ret > 0) 1891f46b5a66SChristoph Hellwig break; 1892ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1893f46b5a66SChristoph Hellwig } 1894f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1895f46b5a66SChristoph Hellwig slot = path->slots[0]; 1896f46b5a66SChristoph Hellwig 1897ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1898d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1899f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1900f46b5a66SChristoph Hellwig break; 1901f46b5a66SChristoph Hellwig 1902c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1903c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1904c5c9cd4dSSage Weil int type; 190531840ae1SZheng Yan u32 size; 190631840ae1SZheng Yan struct btrfs_key new_key; 1907c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1908c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1909c5c9cd4dSSage Weil u8 comp; 1910b5384d48SSage Weil u64 endoff; 191131840ae1SZheng Yan 191231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 191331840ae1SZheng Yan read_extent_buffer(leaf, buf, 191431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 191531840ae1SZheng Yan size); 1916c5c9cd4dSSage Weil 1917c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1918c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1919c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1920c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1921c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1922c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1923d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1924d397712bSChris Mason extent); 1925d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1926d397712bSChris Mason extent); 1927c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1928d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1929d397712bSChris Mason extent); 1930c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1931c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1932c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1933c5c9cd4dSSage Weil extent); 1934c5c9cd4dSSage Weil } 193531840ae1SZheng Yan btrfs_release_path(root, path); 193631840ae1SZheng Yan 1937050006a7SSage Weil if (key.offset + datal <= off || 1938c5c9cd4dSSage Weil key.offset >= off+len) 1939c5c9cd4dSSage Weil goto next; 1940c5c9cd4dSSage Weil 194131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 194231840ae1SZheng Yan new_key.objectid = inode->i_ino; 19434d728ec7SLi Zefan if (off <= key.offset) 1944c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 19454d728ec7SLi Zefan else 19464d728ec7SLi Zefan new_key.offset = destoff; 1947c5c9cd4dSSage Weil 1948a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1949a22285a6SYan, Zheng if (IS_ERR(trans)) { 1950a22285a6SYan, Zheng ret = PTR_ERR(trans); 1951a22285a6SYan, Zheng goto out; 1952a22285a6SYan, Zheng } 1953a22285a6SYan, Zheng 1954c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1955c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1956a22285a6SYan, Zheng if (off > key.offset) { 1957a22285a6SYan, Zheng datao += off - key.offset; 1958a22285a6SYan, Zheng datal -= off - key.offset; 1959a22285a6SYan, Zheng } 1960a22285a6SYan, Zheng 1961a22285a6SYan, Zheng if (key.offset + datal > off + len) 1962a22285a6SYan, Zheng datal = off + len - key.offset; 1963a22285a6SYan, Zheng 1964a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1965a22285a6SYan, Zheng new_key.offset, 1966a22285a6SYan, Zheng new_key.offset + datal, 1967a22285a6SYan, Zheng &hint_byte, 1); 1968a22285a6SYan, Zheng BUG_ON(ret); 1969a22285a6SYan, Zheng 197031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 197131840ae1SZheng Yan &new_key, size); 1972a22285a6SYan, Zheng BUG_ON(ret); 197331840ae1SZheng Yan 197431840ae1SZheng Yan leaf = path->nodes[0]; 197531840ae1SZheng Yan slot = path->slots[0]; 197631840ae1SZheng Yan write_extent_buffer(leaf, buf, 197731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 197831840ae1SZheng Yan size); 1979ae01a0abSYan Zheng 1980f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1981f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1982c5c9cd4dSSage Weil 1983c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1984c5c9cd4dSSage Weil if (!disko) 1985c5c9cd4dSSage Weil datao = 0; 1986c5c9cd4dSSage Weil 1987c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1988c5c9cd4dSSage Weil datao); 1989c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1990c5c9cd4dSSage Weil datal); 1991c5c9cd4dSSage Weil if (disko) { 1992c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1993ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 19945d4f98a2SYan Zheng disko, diskl, 0, 1995f46b5a66SChristoph Hellwig root->root_key.objectid, 19965d4f98a2SYan Zheng inode->i_ino, 19975d4f98a2SYan Zheng new_key.offset - datao); 1998ae01a0abSYan Zheng BUG_ON(ret); 1999f46b5a66SChristoph Hellwig } 2000c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2001c5c9cd4dSSage Weil u64 skip = 0; 2002c5c9cd4dSSage Weil u64 trim = 0; 2003c5c9cd4dSSage Weil if (off > key.offset) { 2004c5c9cd4dSSage Weil skip = off - key.offset; 2005c5c9cd4dSSage Weil new_key.offset += skip; 200631840ae1SZheng Yan } 2007d397712bSChris Mason 2008c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2009c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2010d397712bSChris Mason 2011c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2012c5c9cd4dSSage Weil ret = -EINVAL; 2013a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2014c5c9cd4dSSage Weil goto out; 201531840ae1SZheng Yan } 2016c5c9cd4dSSage Weil size -= skip + trim; 2017c5c9cd4dSSage Weil datal -= skip + trim; 2018a22285a6SYan, Zheng 2019a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2020a22285a6SYan, Zheng new_key.offset, 2021a22285a6SYan, Zheng new_key.offset + datal, 2022a22285a6SYan, Zheng &hint_byte, 1); 2023a22285a6SYan, Zheng BUG_ON(ret); 2024a22285a6SYan, Zheng 2025c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2026c5c9cd4dSSage Weil &new_key, size); 2027a22285a6SYan, Zheng BUG_ON(ret); 2028c5c9cd4dSSage Weil 2029c5c9cd4dSSage Weil if (skip) { 2030d397712bSChris Mason u32 start = 2031d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2032c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2033c5c9cd4dSSage Weil datal); 2034c5c9cd4dSSage Weil } 2035c5c9cd4dSSage Weil 2036c5c9cd4dSSage Weil leaf = path->nodes[0]; 2037c5c9cd4dSSage Weil slot = path->slots[0]; 2038c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2039c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2040c5c9cd4dSSage Weil size); 2041c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2042c5c9cd4dSSage Weil } 2043c5c9cd4dSSage Weil 2044c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2045a22285a6SYan, Zheng btrfs_release_path(root, path); 2046c5c9cd4dSSage Weil 2047a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2048b5384d48SSage Weil 2049b5384d48SSage Weil /* 2050b5384d48SSage Weil * we round up to the block size at eof when 2051b5384d48SSage Weil * determining which extents to clone above, 2052b5384d48SSage Weil * but shouldn't round up the file size 2053b5384d48SSage Weil */ 2054b5384d48SSage Weil endoff = new_key.offset + datal; 20555f3888ffSLi Zefan if (endoff > destoff+olen) 20565f3888ffSLi Zefan endoff = destoff+olen; 2057b5384d48SSage Weil if (endoff > inode->i_size) 2058b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2059b5384d48SSage Weil 2060a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 2061a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2062a22285a6SYan, Zheng BUG_ON(ret); 2063a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2064a22285a6SYan, Zheng } 2065c5c9cd4dSSage Weil next: 206631840ae1SZheng Yan btrfs_release_path(root, path); 2067ae01a0abSYan Zheng key.offset++; 2068ae01a0abSYan Zheng } 2069f46b5a66SChristoph Hellwig ret = 0; 2070f46b5a66SChristoph Hellwig out: 2071ae01a0abSYan Zheng btrfs_release_path(root, path); 2072c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2073f46b5a66SChristoph Hellwig out_unlock: 2074f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2075f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2076ae01a0abSYan Zheng vfree(buf); 2077ae01a0abSYan Zheng btrfs_free_path(path); 2078f46b5a66SChristoph Hellwig out_fput: 2079f46b5a66SChristoph Hellwig fput(src_file); 2080ab67b7c1SYan Zheng out_drop_write: 2081ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2082f46b5a66SChristoph Hellwig return ret; 2083f46b5a66SChristoph Hellwig } 2084f46b5a66SChristoph Hellwig 20857a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2086c5c9cd4dSSage Weil { 2087c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2088c5c9cd4dSSage Weil 20897a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2090c5c9cd4dSSage Weil return -EFAULT; 2091c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2092c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2093c5c9cd4dSSage Weil } 2094c5c9cd4dSSage Weil 2095f46b5a66SChristoph Hellwig /* 2096f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2097f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2098f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2099f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2100f46b5a66SChristoph Hellwig */ 2101b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2102f46b5a66SChristoph Hellwig { 2103f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2104f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2105f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 21061ab86aedSSage Weil int ret; 2107f46b5a66SChristoph Hellwig 21081ab86aedSSage Weil ret = -EPERM; 2109df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2110f46b5a66SChristoph Hellwig goto out; 21111ab86aedSSage Weil 21121ab86aedSSage Weil ret = -EINPROGRESS; 21131ab86aedSSage Weil if (file->private_data) 21141ab86aedSSage Weil goto out; 21159ca9ee09SSage Weil 2116b83cc969SLi Zefan ret = -EROFS; 2117b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2118b83cc969SLi Zefan goto out; 2119b83cc969SLi Zefan 2120c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2121c146afadSYan Zheng if (ret) 2122c146afadSYan Zheng goto out; 2123c146afadSYan Zheng 21249ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 21259ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 21269ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21279ca9ee09SSage Weil 2128f46b5a66SChristoph Hellwig ret = -ENOMEM; 21291ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 2130abd30bb0STsutomu Itoh if (IS_ERR(trans)) 21311ab86aedSSage Weil goto out_drop; 21321ab86aedSSage Weil 21331ab86aedSSage Weil file->private_data = trans; 21341ab86aedSSage Weil return 0; 21351ab86aedSSage Weil 21361ab86aedSSage Weil out_drop: 21371ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 21381ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 21391ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21401ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2141f46b5a66SChristoph Hellwig out: 2142f46b5a66SChristoph Hellwig return ret; 2143f46b5a66SChristoph Hellwig } 2144f46b5a66SChristoph Hellwig 21456ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 21466ef5ed0dSJosef Bacik { 21476ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 21486ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 21496ef5ed0dSJosef Bacik struct btrfs_root *new_root; 21506ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 21516ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 21526ef5ed0dSJosef Bacik struct btrfs_path *path; 21536ef5ed0dSJosef Bacik struct btrfs_key location; 21546ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 21556ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 21566ef5ed0dSJosef Bacik u64 features; 21576ef5ed0dSJosef Bacik u64 objectid = 0; 21586ef5ed0dSJosef Bacik u64 dir_id; 21596ef5ed0dSJosef Bacik 21606ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 21616ef5ed0dSJosef Bacik return -EPERM; 21626ef5ed0dSJosef Bacik 21636ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 21646ef5ed0dSJosef Bacik return -EFAULT; 21656ef5ed0dSJosef Bacik 21666ef5ed0dSJosef Bacik if (!objectid) 21676ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 21686ef5ed0dSJosef Bacik 21696ef5ed0dSJosef Bacik location.objectid = objectid; 21706ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 21716ef5ed0dSJosef Bacik location.offset = (u64)-1; 21726ef5ed0dSJosef Bacik 21736ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 21746ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 21756ef5ed0dSJosef Bacik return PTR_ERR(new_root); 21766ef5ed0dSJosef Bacik 21776ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 21786ef5ed0dSJosef Bacik return -ENOENT; 21796ef5ed0dSJosef Bacik 21806ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 21816ef5ed0dSJosef Bacik if (!path) 21826ef5ed0dSJosef Bacik return -ENOMEM; 21836ef5ed0dSJosef Bacik path->leave_spinning = 1; 21846ef5ed0dSJosef Bacik 21856ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 218698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 21876ef5ed0dSJosef Bacik btrfs_free_path(path); 218898d5dc13STsutomu Itoh return PTR_ERR(trans); 21896ef5ed0dSJosef Bacik } 21906ef5ed0dSJosef Bacik 21916ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 21926ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 21936ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2194cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 21956ef5ed0dSJosef Bacik btrfs_free_path(path); 21966ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 21976ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 21986ef5ed0dSJosef Bacik "this isn't going to work\n"); 21996ef5ed0dSJosef Bacik return -ENOENT; 22006ef5ed0dSJosef Bacik } 22016ef5ed0dSJosef Bacik 22026ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 22036ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 22046ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 22056ef5ed0dSJosef Bacik btrfs_free_path(path); 22066ef5ed0dSJosef Bacik 22076ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 22086ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 22096ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 22106ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 22116ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 22126ef5ed0dSJosef Bacik } 22136ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22146ef5ed0dSJosef Bacik 22156ef5ed0dSJosef Bacik return 0; 22166ef5ed0dSJosef Bacik } 22176ef5ed0dSJosef Bacik 2218bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2219bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2220bf5fc093SJosef Bacik { 2221bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2222bf5fc093SJosef Bacik 2223bf5fc093SJosef Bacik space->total_bytes = 0; 2224bf5fc093SJosef Bacik space->used_bytes = 0; 2225bf5fc093SJosef Bacik space->flags = 0; 2226bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2227bf5fc093SJosef Bacik space->flags = block_group->flags; 2228bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2229bf5fc093SJosef Bacik space->used_bytes += 2230bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2231bf5fc093SJosef Bacik } 2232bf5fc093SJosef Bacik } 2233bf5fc093SJosef Bacik 22341406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 22351406e432SJosef Bacik { 22361406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 22371406e432SJosef Bacik struct btrfs_ioctl_space_info space; 22381406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 22397fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 22407fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 22411406e432SJosef Bacik struct btrfs_space_info *info; 2242bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2243bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2244bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2245bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2246bf5fc093SJosef Bacik int num_types = 4; 22477fde62bfSChris Mason int alloc_size; 22481406e432SJosef Bacik int ret = 0; 224951788b1bSDan Rosenberg u64 slot_count = 0; 2250bf5fc093SJosef Bacik int i, c; 22511406e432SJosef Bacik 22521406e432SJosef Bacik if (copy_from_user(&space_args, 22531406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 22541406e432SJosef Bacik sizeof(space_args))) 22551406e432SJosef Bacik return -EFAULT; 22561406e432SJosef Bacik 2257bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2258bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2259bf5fc093SJosef Bacik 2260bf5fc093SJosef Bacik info = NULL; 22617fde62bfSChris Mason rcu_read_lock(); 2262bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2263bf5fc093SJosef Bacik list) { 2264bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2265bf5fc093SJosef Bacik info = tmp; 2266bf5fc093SJosef Bacik break; 2267bf5fc093SJosef Bacik } 2268bf5fc093SJosef Bacik } 22697fde62bfSChris Mason rcu_read_unlock(); 22701406e432SJosef Bacik 2271bf5fc093SJosef Bacik if (!info) 2272bf5fc093SJosef Bacik continue; 2273bf5fc093SJosef Bacik 2274bf5fc093SJosef Bacik down_read(&info->groups_sem); 2275bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2276bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2277bf5fc093SJosef Bacik slot_count++; 2278bf5fc093SJosef Bacik } 2279bf5fc093SJosef Bacik up_read(&info->groups_sem); 2280bf5fc093SJosef Bacik } 2281bf5fc093SJosef Bacik 22827fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 22837fde62bfSChris Mason if (space_args.space_slots == 0) { 22847fde62bfSChris Mason space_args.total_spaces = slot_count; 22857fde62bfSChris Mason goto out; 22867fde62bfSChris Mason } 2287bf5fc093SJosef Bacik 228851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2289bf5fc093SJosef Bacik 22907fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2291bf5fc093SJosef Bacik 22927fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 22937fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 22947fde62bfSChris Mason */ 22957fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 22967fde62bfSChris Mason return -ENOMEM; 22977fde62bfSChris Mason 22987fde62bfSChris Mason space_args.total_spaces = 0; 22997fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 23007fde62bfSChris Mason if (!dest) 23017fde62bfSChris Mason return -ENOMEM; 23027fde62bfSChris Mason dest_orig = dest; 23037fde62bfSChris Mason 23047fde62bfSChris Mason /* now we have a buffer to copy into */ 2305bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2306bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2307bf5fc093SJosef Bacik 230851788b1bSDan Rosenberg if (!slot_count) 230951788b1bSDan Rosenberg break; 231051788b1bSDan Rosenberg 2311bf5fc093SJosef Bacik info = NULL; 23121406e432SJosef Bacik rcu_read_lock(); 2313bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2314bf5fc093SJosef Bacik list) { 2315bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2316bf5fc093SJosef Bacik info = tmp; 23177fde62bfSChris Mason break; 2318bf5fc093SJosef Bacik } 2319bf5fc093SJosef Bacik } 2320bf5fc093SJosef Bacik rcu_read_unlock(); 23217fde62bfSChris Mason 2322bf5fc093SJosef Bacik if (!info) 2323bf5fc093SJosef Bacik continue; 2324bf5fc093SJosef Bacik down_read(&info->groups_sem); 2325bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2326bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2327bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2328bf5fc093SJosef Bacik &space); 23297fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 23301406e432SJosef Bacik dest++; 23311406e432SJosef Bacik space_args.total_spaces++; 233251788b1bSDan Rosenberg slot_count--; 23331406e432SJosef Bacik } 233451788b1bSDan Rosenberg if (!slot_count) 233551788b1bSDan Rosenberg break; 2336bf5fc093SJosef Bacik } 2337bf5fc093SJosef Bacik up_read(&info->groups_sem); 2338bf5fc093SJosef Bacik } 23391406e432SJosef Bacik 23407fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 23417fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 23427fde62bfSChris Mason 23437fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 23447fde62bfSChris Mason ret = -EFAULT; 23457fde62bfSChris Mason 23467fde62bfSChris Mason kfree(dest_orig); 23477fde62bfSChris Mason out: 23487fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 23491406e432SJosef Bacik ret = -EFAULT; 23501406e432SJosef Bacik 23511406e432SJosef Bacik return ret; 23521406e432SJosef Bacik } 23531406e432SJosef Bacik 2354f46b5a66SChristoph Hellwig /* 2355f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2356f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2357f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2358f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2359f46b5a66SChristoph Hellwig */ 2360f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2361f46b5a66SChristoph Hellwig { 2362f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2363f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2364f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2365f46b5a66SChristoph Hellwig 2366f46b5a66SChristoph Hellwig trans = file->private_data; 23671ab86aedSSage Weil if (!trans) 23681ab86aedSSage Weil return -EINVAL; 2369b214107eSChristoph Hellwig file->private_data = NULL; 23709ca9ee09SSage Weil 23711ab86aedSSage Weil btrfs_end_transaction(trans, root); 23721ab86aedSSage Weil 23739ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 23749ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 23759ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 23769ca9ee09SSage Weil 2377cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 23781ab86aedSSage Weil return 0; 2379f46b5a66SChristoph Hellwig } 2380f46b5a66SChristoph Hellwig 238146204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 238246204592SSage Weil { 238346204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 238446204592SSage Weil struct btrfs_trans_handle *trans; 238546204592SSage Weil u64 transid; 2386db5b493aSTsutomu Itoh int ret; 238746204592SSage Weil 238846204592SSage Weil trans = btrfs_start_transaction(root, 0); 238998d5dc13STsutomu Itoh if (IS_ERR(trans)) 239098d5dc13STsutomu Itoh return PTR_ERR(trans); 239146204592SSage Weil transid = trans->transid; 2392db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 2393db5b493aSTsutomu Itoh if (ret) 2394db5b493aSTsutomu Itoh return ret; 239546204592SSage Weil 239646204592SSage Weil if (argp) 239746204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 239846204592SSage Weil return -EFAULT; 239946204592SSage Weil return 0; 240046204592SSage Weil } 240146204592SSage Weil 240246204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 240346204592SSage Weil { 240446204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 240546204592SSage Weil u64 transid; 240646204592SSage Weil 240746204592SSage Weil if (argp) { 240846204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 240946204592SSage Weil return -EFAULT; 241046204592SSage Weil } else { 241146204592SSage Weil transid = 0; /* current trans */ 241246204592SSage Weil } 241346204592SSage Weil return btrfs_wait_for_commit(root, transid); 241446204592SSage Weil } 241546204592SSage Weil 2416f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2417f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2418f46b5a66SChristoph Hellwig { 2419f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 24204bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2421f46b5a66SChristoph Hellwig 2422f46b5a66SChristoph Hellwig switch (cmd) { 24236cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 24246cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 24256cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 24266cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 24276cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 24286cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2429f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2430fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2431fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2432fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 24333de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2434fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 243576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 243676dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 24370caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 24380caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 24390caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 24400caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 24416ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 24426ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2443f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 24441e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 24451e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 24461e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2447f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 24484bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2449f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 24504bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2451f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 24524bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2453f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2454f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2455f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2456c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2457c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 24587a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2459f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2460f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2461f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2462f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2463ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2464ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2465ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2466ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 24671406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 24681406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2469f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2470f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2471f46b5a66SChristoph Hellwig return 0; 247246204592SSage Weil case BTRFS_IOC_START_SYNC: 247346204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 247446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 247546204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2476f46b5a66SChristoph Hellwig } 2477f46b5a66SChristoph Hellwig 2478f46b5a66SChristoph Hellwig return -ENOTTY; 2479f46b5a66SChristoph Hellwig } 2480