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> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53f46b5a66SChristoph Hellwig 546cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 556cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 566cbff00fSChristoph Hellwig { 576cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 586cbff00fSChristoph Hellwig return flags; 596cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 606cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 616cbff00fSChristoph Hellwig else 626cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 636cbff00fSChristoph Hellwig } 64f46b5a66SChristoph Hellwig 656cbff00fSChristoph Hellwig /* 666cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 676cbff00fSChristoph Hellwig */ 686cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 696cbff00fSChristoph Hellwig { 706cbff00fSChristoph Hellwig unsigned int iflags = 0; 716cbff00fSChristoph Hellwig 726cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 736cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 756cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 776cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 796cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 816cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 836cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 846cbff00fSChristoph Hellwig 856cbff00fSChristoph Hellwig return iflags; 866cbff00fSChristoph Hellwig } 876cbff00fSChristoph Hellwig 886cbff00fSChristoph Hellwig /* 896cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 906cbff00fSChristoph Hellwig */ 916cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 926cbff00fSChristoph Hellwig { 936cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 986cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 996cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1006cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1016cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1026cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1036cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1046cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1056cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1066cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1076cbff00fSChristoph Hellwig } 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig /* 1106cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1116cbff00fSChristoph Hellwig * 1126cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1136cbff00fSChristoph Hellwig */ 1146cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1156cbff00fSChristoph Hellwig { 1160b4dcea5SChris Mason unsigned int flags; 1170b4dcea5SChris Mason 1180b4dcea5SChris Mason if (!dir) 1190b4dcea5SChris Mason return; 1200b4dcea5SChris Mason 1210b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1226cbff00fSChristoph Hellwig 1236cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1246cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1256cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1266cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1276cbff00fSChristoph Hellwig 1286cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1296cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1336cbff00fSChristoph Hellwig { 1346cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1356cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1386cbff00fSChristoph Hellwig return -EFAULT; 1396cbff00fSChristoph Hellwig return 0; 1406cbff00fSChristoph Hellwig } 1416cbff00fSChristoph Hellwig 14275e7cb7fSLiu Bo static int check_flags(unsigned int flags) 14375e7cb7fSLiu Bo { 14475e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 14575e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 14675e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 147*e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 148*e1e8fb6aSLi Zefan FS_NOCOW_FL)) 14975e7cb7fSLiu Bo return -EOPNOTSUPP; 15075e7cb7fSLiu Bo 15175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 15275e7cb7fSLiu Bo return -EINVAL; 15375e7cb7fSLiu Bo 15475e7cb7fSLiu Bo return 0; 15575e7cb7fSLiu Bo } 15675e7cb7fSLiu Bo 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 1596cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1606cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1616cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1626cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1636cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1646cbff00fSChristoph Hellwig int ret; 1656cbff00fSChristoph Hellwig 166b83cc969SLi Zefan if (btrfs_root_readonly(root)) 167b83cc969SLi Zefan return -EROFS; 168b83cc969SLi Zefan 1696cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1706cbff00fSChristoph Hellwig return -EFAULT; 1716cbff00fSChristoph Hellwig 17275e7cb7fSLiu Bo ret = check_flags(flags); 17375e7cb7fSLiu Bo if (ret) 17475e7cb7fSLiu Bo return ret; 1756cbff00fSChristoph Hellwig 1766cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1776cbff00fSChristoph Hellwig return -EACCES; 1786cbff00fSChristoph Hellwig 1796cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1806cbff00fSChristoph Hellwig 1816cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1826cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1836cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1846cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1856cbff00fSChristoph Hellwig ret = -EPERM; 1866cbff00fSChristoph Hellwig goto out_unlock; 1876cbff00fSChristoph Hellwig } 1886cbff00fSChristoph Hellwig } 1896cbff00fSChristoph Hellwig 1906cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1916cbff00fSChristoph Hellwig if (ret) 1926cbff00fSChristoph Hellwig goto out_unlock; 1936cbff00fSChristoph Hellwig 1946cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1956cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1966cbff00fSChristoph Hellwig else 1976cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1986cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1996cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2006cbff00fSChristoph Hellwig else 2016cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2026cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2036cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2046cbff00fSChristoph Hellwig else 2056cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2066cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2076cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2086cbff00fSChristoph Hellwig else 2096cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2106cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2116cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2126cbff00fSChristoph Hellwig else 2136cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2146cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2156cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2166cbff00fSChristoph Hellwig else 2176cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 218*e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 219*e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 220*e1e8fb6aSLi Zefan else 221*e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2226cbff00fSChristoph Hellwig 22375e7cb7fSLiu Bo /* 22475e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 22575e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 22675e7cb7fSLiu Bo * things smaller. 22775e7cb7fSLiu Bo */ 22875e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 22975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 23075e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 23175e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 23275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 23375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 23475e7cb7fSLiu Bo } 2356cbff00fSChristoph Hellwig 2366cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2373612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 2386cbff00fSChristoph Hellwig 2396cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2406cbff00fSChristoph Hellwig BUG_ON(ret); 2416cbff00fSChristoph Hellwig 2426cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2436cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2446cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2456cbff00fSChristoph Hellwig 2466cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2472d4e6f6aSliubo 2482d4e6f6aSliubo ret = 0; 2496cbff00fSChristoph Hellwig out_unlock: 2506cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2512d4e6f6aSliubo return ret; 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 261f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 262f7039b1dSLi Dongyang { 263f7039b1dSLi Dongyang struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; 264f7039b1dSLi Dongyang struct btrfs_fs_info *fs_info = root->fs_info; 265f7039b1dSLi Dongyang struct btrfs_device *device; 266f7039b1dSLi Dongyang struct request_queue *q; 267f7039b1dSLi Dongyang struct fstrim_range range; 268f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 269f7039b1dSLi Dongyang u64 num_devices = 0; 270f7039b1dSLi Dongyang int ret; 271f7039b1dSLi Dongyang 272f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 273f7039b1dSLi Dongyang return -EPERM; 274f7039b1dSLi Dongyang 275f7039b1dSLi Dongyang mutex_lock(&fs_info->fs_devices->device_list_mutex); 276f7039b1dSLi Dongyang list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { 277f7039b1dSLi Dongyang if (!device->bdev) 278f7039b1dSLi Dongyang continue; 279f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 280f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 281f7039b1dSLi Dongyang num_devices++; 282f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 283f7039b1dSLi Dongyang minlen); 284f7039b1dSLi Dongyang } 285f7039b1dSLi Dongyang } 286f7039b1dSLi Dongyang mutex_unlock(&fs_info->fs_devices->device_list_mutex); 287f7039b1dSLi Dongyang if (!num_devices) 288f7039b1dSLi Dongyang return -EOPNOTSUPP; 289f7039b1dSLi Dongyang 290f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 291f7039b1dSLi Dongyang return -EFAULT; 292f7039b1dSLi Dongyang 293f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 294f7039b1dSLi Dongyang ret = btrfs_trim_fs(root, &range); 295f7039b1dSLi Dongyang if (ret < 0) 296f7039b1dSLi Dongyang return ret; 297f7039b1dSLi Dongyang 298f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 299f7039b1dSLi Dongyang return -EFAULT; 300f7039b1dSLi Dongyang 301f7039b1dSLi Dongyang return 0; 302f7039b1dSLi Dongyang } 303f7039b1dSLi Dongyang 304cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 305cb8e7090SChristoph Hellwig struct dentry *dentry, 30672fd032eSSage Weil char *name, int namelen, 30772fd032eSSage Weil u64 *async_transid) 308f46b5a66SChristoph Hellwig { 309f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 310f46b5a66SChristoph Hellwig struct btrfs_key key; 311f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 312f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 313f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 31476dda93cSYan, Zheng struct btrfs_root *new_root; 3156a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 3166a912213SJosef Bacik struct inode *dir; 317f46b5a66SChristoph Hellwig int ret; 318f46b5a66SChristoph Hellwig int err; 319f46b5a66SChristoph Hellwig u64 objectid; 320f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3213de4586cSChris Mason u64 index = 0; 322f46b5a66SChristoph Hellwig 323a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 324a22285a6SYan, Zheng 0, &objectid); 3256a912213SJosef Bacik if (ret) { 3266a912213SJosef Bacik dput(parent); 327a22285a6SYan, Zheng return ret; 3286a912213SJosef Bacik } 3296a912213SJosef Bacik 3306a912213SJosef Bacik dir = parent->d_inode; 3316a912213SJosef Bacik 3329ed74f2dSJosef Bacik /* 3339ed74f2dSJosef Bacik * 1 - inode item 3349ed74f2dSJosef Bacik * 2 - refs 3359ed74f2dSJosef Bacik * 1 - root item 3369ed74f2dSJosef Bacik * 2 - dir items 3379ed74f2dSJosef Bacik */ 338a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3396a912213SJosef Bacik if (IS_ERR(trans)) { 3406a912213SJosef Bacik dput(parent); 341a22285a6SYan, Zheng return PTR_ERR(trans); 3426a912213SJosef Bacik } 343f46b5a66SChristoph Hellwig 3445d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3455d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 3468e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3478e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3488e8a1e31SJosef Bacik goto fail; 3498e8a1e31SJosef Bacik } 350f46b5a66SChristoph Hellwig 3515d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 352f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 353f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3545d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 355f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 356f46b5a66SChristoph Hellwig 357f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 358f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 359f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3605d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3615d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3625d4f98a2SYan Zheng BTRFS_UUID_SIZE); 363f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 364f46b5a66SChristoph Hellwig 365f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 366f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 367f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 368f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 369f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 370a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 371f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 372f46b5a66SChristoph Hellwig 37308fe4db1SLi Zefan root_item.flags = 0; 37408fe4db1SLi Zefan root_item.byte_limit = 0; 37508fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 37608fe4db1SLi Zefan 377f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 37884234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 379f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 380f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 38186b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 38280ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 383f46b5a66SChristoph Hellwig 384f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 385f46b5a66SChristoph Hellwig root_item.drop_level = 0; 386f46b5a66SChristoph Hellwig 387925baeddSChris Mason btrfs_tree_unlock(leaf); 388f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 389f46b5a66SChristoph Hellwig leaf = NULL; 390f46b5a66SChristoph Hellwig 391f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 392f46b5a66SChristoph Hellwig 393f46b5a66SChristoph Hellwig key.objectid = objectid; 3945d4f98a2SYan Zheng key.offset = 0; 395f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 396f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 397f46b5a66SChristoph Hellwig &root_item); 398f46b5a66SChristoph Hellwig if (ret) 399f46b5a66SChristoph Hellwig goto fail; 400f46b5a66SChristoph Hellwig 40176dda93cSYan, Zheng key.offset = (u64)-1; 40276dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 40376dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 40476dda93cSYan, Zheng 40576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 40676dda93cSYan, Zheng 40776dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 40876dda93cSYan, Zheng BTRFS_I(dir)->block_group); 409f46b5a66SChristoph Hellwig /* 410f46b5a66SChristoph Hellwig * insert the directory item 411f46b5a66SChristoph Hellwig */ 4123de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 4133de4586cSChris Mason BUG_ON(ret); 4143de4586cSChris Mason 4153de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 416f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 4173de4586cSChris Mason BTRFS_FT_DIR, index); 418f46b5a66SChristoph Hellwig if (ret) 419f46b5a66SChristoph Hellwig goto fail; 4200660b5afSChris Mason 42152c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 42252c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 42352c26179SYan Zheng BUG_ON(ret); 42452c26179SYan Zheng 4250660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4264df27c4dSYan, Zheng objectid, root->root_key.objectid, 4270660b5afSChris Mason dir->i_ino, index, name, namelen); 42876dda93cSYan, Zheng 4290660b5afSChris Mason BUG_ON(ret); 4300660b5afSChris Mason 43176dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 432f46b5a66SChristoph Hellwig fail: 4336a912213SJosef Bacik dput(parent); 43472fd032eSSage Weil if (async_transid) { 43572fd032eSSage Weil *async_transid = trans->transid; 43672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 43772fd032eSSage Weil } else { 43876dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 43972fd032eSSage Weil } 440f46b5a66SChristoph Hellwig if (err && !ret) 441f46b5a66SChristoph Hellwig ret = err; 442f46b5a66SChristoph Hellwig return ret; 443f46b5a66SChristoph Hellwig } 444f46b5a66SChristoph Hellwig 44572fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 446b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 447b83cc969SLi Zefan bool readonly) 448f46b5a66SChristoph Hellwig { 4492e4bfab9SYan, Zheng struct inode *inode; 4506a912213SJosef Bacik struct dentry *parent; 451f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 452f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4532e4bfab9SYan, Zheng int ret; 454f46b5a66SChristoph Hellwig 455f46b5a66SChristoph Hellwig if (!root->ref_cows) 456f46b5a66SChristoph Hellwig return -EINVAL; 457f46b5a66SChristoph Hellwig 458a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 459a22285a6SYan, Zheng if (!pending_snapshot) 460a22285a6SYan, Zheng return -ENOMEM; 461a22285a6SYan, Zheng 462a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 463a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 464a22285a6SYan, Zheng pending_snapshot->root = root; 465b83cc969SLi Zefan pending_snapshot->readonly = readonly; 466a22285a6SYan, Zheng 467a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 468a22285a6SYan, Zheng if (IS_ERR(trans)) { 469a22285a6SYan, Zheng ret = PTR_ERR(trans); 470a22285a6SYan, Zheng goto fail; 471a22285a6SYan, Zheng } 472a22285a6SYan, Zheng 473a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 474a22285a6SYan, Zheng BUG_ON(ret); 475a22285a6SYan, Zheng 476a22285a6SYan, Zheng list_add(&pending_snapshot->list, 477a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 47872fd032eSSage Weil if (async_transid) { 47972fd032eSSage Weil *async_transid = trans->transid; 48072fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 48172fd032eSSage Weil root->fs_info->extent_root, 1); 48272fd032eSSage Weil } else { 48372fd032eSSage Weil ret = btrfs_commit_transaction(trans, 48472fd032eSSage Weil root->fs_info->extent_root); 48572fd032eSSage Weil } 486a22285a6SYan, Zheng BUG_ON(ret); 487a22285a6SYan, Zheng 488a22285a6SYan, Zheng ret = pending_snapshot->error; 489f46b5a66SChristoph Hellwig if (ret) 4902e4bfab9SYan, Zheng goto fail; 491f46b5a66SChristoph Hellwig 49266b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 49366b4ffd1SJosef Bacik if (ret) 49466b4ffd1SJosef Bacik goto fail; 495f46b5a66SChristoph Hellwig 4966a912213SJosef Bacik parent = dget_parent(dentry); 4976a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 4986a912213SJosef Bacik dput(parent); 4992e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5002e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5012e4bfab9SYan, Zheng goto fail; 5022e4bfab9SYan, Zheng } 5032e4bfab9SYan, Zheng BUG_ON(!inode); 5042e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5052e4bfab9SYan, Zheng ret = 0; 5062e4bfab9SYan, Zheng fail: 507a22285a6SYan, Zheng kfree(pending_snapshot); 508f46b5a66SChristoph Hellwig return ret; 509f46b5a66SChristoph Hellwig } 510f46b5a66SChristoph Hellwig 5114260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5124260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5134260f7c7SSage Weil * minimal. 5144260f7c7SSage Weil */ 5154260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5164260f7c7SSage Weil { 5174260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5184260f7c7SSage Weil 5194260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5204260f7c7SSage Weil return 0; 5214260f7c7SSage Weil if (inode->i_uid == fsuid) 5224260f7c7SSage Weil return 0; 5234260f7c7SSage Weil if (dir->i_uid == fsuid) 5244260f7c7SSage Weil return 0; 5254260f7c7SSage Weil return !capable(CAP_FOWNER); 5264260f7c7SSage Weil } 5274260f7c7SSage Weil 5284260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5294260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5304260f7c7SSage Weil * whether the type of victim is right. 5314260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5324260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5334260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5344260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5354260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5364260f7c7SSage Weil * a. be owner of dir, or 5374260f7c7SSage Weil * b. be owner of victim, or 5384260f7c7SSage Weil * c. have CAP_FOWNER capability 5394260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5404260f7c7SSage Weil * links pointing to it. 5414260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5424260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5434260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5444260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5454260f7c7SSage Weil * nfs_async_unlink(). 5464260f7c7SSage Weil */ 5474260f7c7SSage Weil 5484260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5494260f7c7SSage Weil { 5504260f7c7SSage Weil int error; 5514260f7c7SSage Weil 5524260f7c7SSage Weil if (!victim->d_inode) 5534260f7c7SSage Weil return -ENOENT; 5544260f7c7SSage Weil 5554260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5564260f7c7SSage Weil audit_inode_child(victim, dir); 5574260f7c7SSage Weil 5584260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5594260f7c7SSage Weil if (error) 5604260f7c7SSage Weil return error; 5614260f7c7SSage Weil if (IS_APPEND(dir)) 5624260f7c7SSage Weil return -EPERM; 5634260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 5644260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 5654260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 5664260f7c7SSage Weil return -EPERM; 5674260f7c7SSage Weil if (isdir) { 5684260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 5694260f7c7SSage Weil return -ENOTDIR; 5704260f7c7SSage Weil if (IS_ROOT(victim)) 5714260f7c7SSage Weil return -EBUSY; 5724260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 5734260f7c7SSage Weil return -EISDIR; 5744260f7c7SSage Weil if (IS_DEADDIR(dir)) 5754260f7c7SSage Weil return -ENOENT; 5764260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 5774260f7c7SSage Weil return -EBUSY; 5784260f7c7SSage Weil return 0; 5794260f7c7SSage Weil } 5804260f7c7SSage Weil 581cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 582cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 583cb8e7090SChristoph Hellwig { 584cb8e7090SChristoph Hellwig if (child->d_inode) 585cb8e7090SChristoph Hellwig return -EEXIST; 586cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 587cb8e7090SChristoph Hellwig return -ENOENT; 588cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 589cb8e7090SChristoph Hellwig } 590cb8e7090SChristoph Hellwig 591cb8e7090SChristoph Hellwig /* 592cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 593cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 594cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 595cb8e7090SChristoph Hellwig */ 59676dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 59776dda93cSYan, Zheng char *name, int namelen, 59872fd032eSSage Weil struct btrfs_root *snap_src, 599b83cc969SLi Zefan u64 *async_transid, bool readonly) 600cb8e7090SChristoph Hellwig { 60176dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 602cb8e7090SChristoph Hellwig struct dentry *dentry; 603cb8e7090SChristoph Hellwig int error; 604cb8e7090SChristoph Hellwig 60576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 606cb8e7090SChristoph Hellwig 607cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 608cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 609cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 610cb8e7090SChristoph Hellwig goto out_unlock; 611cb8e7090SChristoph Hellwig 612cb8e7090SChristoph Hellwig error = -EEXIST; 613cb8e7090SChristoph Hellwig if (dentry->d_inode) 614cb8e7090SChristoph Hellwig goto out_dput; 615cb8e7090SChristoph Hellwig 616cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 617cb8e7090SChristoph Hellwig if (error) 618cb8e7090SChristoph Hellwig goto out_dput; 619cb8e7090SChristoph Hellwig 62076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 621cb8e7090SChristoph Hellwig if (error) 622cb8e7090SChristoph Hellwig goto out_drop_write; 623cb8e7090SChristoph Hellwig 62476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 62576dda93cSYan, Zheng 62676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 62776dda93cSYan, Zheng goto out_up_read; 62876dda93cSYan, Zheng 6293de4586cSChris Mason if (snap_src) { 63072fd032eSSage Weil error = create_snapshot(snap_src, dentry, 631b83cc969SLi Zefan name, namelen, async_transid, readonly); 6323de4586cSChris Mason } else { 63376dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 63472fd032eSSage Weil name, namelen, async_transid); 6353de4586cSChris Mason } 63676dda93cSYan, Zheng if (!error) 63776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 63876dda93cSYan, Zheng out_up_read: 63976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 640cb8e7090SChristoph Hellwig out_drop_write: 641cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 642cb8e7090SChristoph Hellwig out_dput: 643cb8e7090SChristoph Hellwig dput(dentry); 644cb8e7090SChristoph Hellwig out_unlock: 64576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 646cb8e7090SChristoph Hellwig return error; 647cb8e7090SChristoph Hellwig } 648cb8e7090SChristoph Hellwig 649940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 6501e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 6511e701a32SChris Mason u64 *defrag_end) 652940100a4SChris Mason { 653940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 654940100a4SChris Mason struct extent_map *em = NULL; 655940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 656940100a4SChris Mason int ret = 1; 657940100a4SChris Mason 6581e701a32SChris Mason 6591e701a32SChris Mason if (thresh == 0) 6601e701a32SChris Mason thresh = 256 * 1024; 6611e701a32SChris Mason 662940100a4SChris Mason /* 663940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 664940100a4SChris Mason * defragging it 665940100a4SChris Mason */ 666940100a4SChris Mason if (start < *defrag_end) 667940100a4SChris Mason return 1; 668940100a4SChris Mason 669940100a4SChris Mason *skip = 0; 670940100a4SChris Mason 671940100a4SChris Mason /* 672940100a4SChris Mason * hopefully we have this extent in the tree already, try without 673940100a4SChris Mason * the full extent lock 674940100a4SChris Mason */ 675940100a4SChris Mason read_lock(&em_tree->lock); 676940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 677940100a4SChris Mason read_unlock(&em_tree->lock); 678940100a4SChris Mason 679940100a4SChris Mason if (!em) { 680940100a4SChris Mason /* get the big lock and read metadata off disk */ 681940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 682940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 683940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 684940100a4SChris Mason 6856cf8bfbfSDan Carpenter if (IS_ERR(em)) 686940100a4SChris Mason return 0; 687940100a4SChris Mason } 688940100a4SChris Mason 689940100a4SChris Mason /* this will cover holes, and inline extents */ 690940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 691940100a4SChris Mason ret = 0; 692940100a4SChris Mason 693940100a4SChris Mason /* 694940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 695940100a4SChris Mason */ 6961e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 697940100a4SChris Mason ret = 0; 698940100a4SChris Mason 699940100a4SChris Mason /* 700940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 701940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 702940100a4SChris Mason * so that the next tiny extent will force a defrag. 703940100a4SChris Mason * 704940100a4SChris Mason * The end result of this is that tiny extents before a single big 705940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 706940100a4SChris Mason */ 707940100a4SChris Mason if (ret) { 708940100a4SChris Mason *last_len += len; 709940100a4SChris Mason *defrag_end = extent_map_end(em); 710940100a4SChris Mason } else { 711940100a4SChris Mason *last_len = 0; 712940100a4SChris Mason *skip = extent_map_end(em); 713940100a4SChris Mason *defrag_end = 0; 714940100a4SChris Mason } 715940100a4SChris Mason 716940100a4SChris Mason free_extent_map(em); 717940100a4SChris Mason return ret; 718940100a4SChris Mason } 719940100a4SChris Mason 7201e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 7211e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 722f46b5a66SChristoph Hellwig { 723f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 724f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 725f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7263eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 727f46b5a66SChristoph Hellwig struct page *page; 7281a419d85SLi Zefan struct btrfs_super_block *disk_super; 729f46b5a66SChristoph Hellwig unsigned long last_index; 730f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 731f46b5a66SChristoph Hellwig unsigned long total_read = 0; 7321a419d85SLi Zefan u64 features; 733f46b5a66SChristoph Hellwig u64 page_start; 734f46b5a66SChristoph Hellwig u64 page_end; 735940100a4SChris Mason u64 last_len = 0; 736940100a4SChris Mason u64 skip = 0; 737940100a4SChris Mason u64 defrag_end = 0; 738f46b5a66SChristoph Hellwig unsigned long i; 739f46b5a66SChristoph Hellwig int ret; 7401a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 7411a419d85SLi Zefan 7421a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 7431a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 7441a419d85SLi Zefan return -EINVAL; 7451a419d85SLi Zefan if (range->compress_type) 7461a419d85SLi Zefan compress_type = range->compress_type; 7471a419d85SLi Zefan } 748f46b5a66SChristoph Hellwig 749940100a4SChris Mason if (inode->i_size == 0) 750940100a4SChris Mason return 0; 751f46b5a66SChristoph Hellwig 7521e701a32SChris Mason if (range->start + range->len > range->start) { 7531e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 7541e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 7551e701a32SChris Mason } else { 756940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 7571e701a32SChris Mason } 7581e701a32SChris Mason 7591e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 760940100a4SChris Mason while (i <= last_index) { 761940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 7621e701a32SChris Mason PAGE_CACHE_SIZE, 7631e701a32SChris Mason range->extent_thresh, 7641e701a32SChris Mason &last_len, &skip, 765940100a4SChris Mason &defrag_end)) { 766940100a4SChris Mason unsigned long next; 767940100a4SChris Mason /* 768940100a4SChris Mason * the should_defrag function tells us how much to skip 769940100a4SChris Mason * bump our counter by the suggested amount 770940100a4SChris Mason */ 771940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 772940100a4SChris Mason i = max(i + 1, next); 773940100a4SChris Mason continue; 774940100a4SChris Mason } 775940100a4SChris Mason 776f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 777f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 778f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 779f46b5a66SChristoph Hellwig } 780f46b5a66SChristoph Hellwig total_read++; 781940100a4SChris Mason mutex_lock(&inode->i_mutex); 7821e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 7831a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 784940100a4SChris Mason 7850ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 7860ca1f7ceSYan, Zheng if (ret) 7870ca1f7ceSYan, Zheng goto err_unlock; 7883eaa2885SChris Mason again: 789940100a4SChris Mason if (inode->i_size == 0 || 790940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 791940100a4SChris Mason ret = 0; 792940100a4SChris Mason goto err_reservations; 793940100a4SChris Mason } 794940100a4SChris Mason 795f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 7960ca1f7ceSYan, Zheng if (!page) { 7970ca1f7ceSYan, Zheng ret = -ENOMEM; 798940100a4SChris Mason goto err_reservations; 7990ca1f7ceSYan, Zheng } 800940100a4SChris Mason 801f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 802f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 803f46b5a66SChristoph Hellwig lock_page(page); 804f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 805f46b5a66SChristoph Hellwig unlock_page(page); 806f46b5a66SChristoph Hellwig page_cache_release(page); 8070ca1f7ceSYan, Zheng ret = -EIO; 808940100a4SChris Mason goto err_reservations; 809f46b5a66SChristoph Hellwig } 810f46b5a66SChristoph Hellwig } 811f46b5a66SChristoph Hellwig 812940100a4SChris Mason if (page->mapping != inode->i_mapping) { 813940100a4SChris Mason unlock_page(page); 814940100a4SChris Mason page_cache_release(page); 815940100a4SChris Mason goto again; 816940100a4SChris Mason } 817940100a4SChris Mason 818f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 819f46b5a66SChristoph Hellwig 820940100a4SChris Mason if (PageDirty(page)) { 8210ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 822940100a4SChris Mason goto loop_unlock; 823940100a4SChris Mason } 824940100a4SChris Mason 825f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 826f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 827f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 8283eaa2885SChris Mason 8293eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 8303eaa2885SChris Mason if (ordered) { 8313eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 8323eaa2885SChris Mason unlock_page(page); 8333eaa2885SChris Mason page_cache_release(page); 8343eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 8353eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 8363eaa2885SChris Mason goto again; 8373eaa2885SChris Mason } 8383eaa2885SChris Mason set_page_extent_mapped(page); 8393eaa2885SChris Mason 840f87f057bSChris Mason /* 841f87f057bSChris Mason * this makes sure page_mkwrite is called on the 842f87f057bSChris Mason * page if it is dirtied again later 843f87f057bSChris Mason */ 844f87f057bSChris Mason clear_page_dirty_for_io(page); 845940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 846940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 847940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 848f87f057bSChris Mason 8492ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 850940100a4SChris Mason ClearPageChecked(page); 851f46b5a66SChristoph Hellwig set_page_dirty(page); 852a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 853940100a4SChris Mason 854940100a4SChris Mason loop_unlock: 855f46b5a66SChristoph Hellwig unlock_page(page); 856f46b5a66SChristoph Hellwig page_cache_release(page); 857940100a4SChris Mason mutex_unlock(&inode->i_mutex); 858940100a4SChris Mason 859f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 860940100a4SChris Mason i++; 861f46b5a66SChristoph Hellwig } 862f46b5a66SChristoph Hellwig 8631e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 8641e701a32SChris Mason filemap_flush(inode->i_mapping); 8651e701a32SChris Mason 8661e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 8671e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 8681e701a32SChris Mason * we have to make sure the IO is actually started and that 8691e701a32SChris Mason * ordered extents get created before we return 8701e701a32SChris Mason */ 8711e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 8721e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 8731e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 8741e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 8751e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 8761e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 8771e701a32SChris Mason } 8781e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 8791e701a32SChris Mason 8801e701a32SChris Mason mutex_lock(&inode->i_mutex); 881261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 8821e701a32SChris Mason mutex_unlock(&inode->i_mutex); 8831e701a32SChris Mason } 8841e701a32SChris Mason 8851a419d85SLi Zefan disk_super = &root->fs_info->super_copy; 8861a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 8871a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 8881a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 8891a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 8901a419d85SLi Zefan } 8911a419d85SLi Zefan 892f46b5a66SChristoph Hellwig return 0; 893940100a4SChris Mason 894940100a4SChris Mason err_reservations: 8950ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 8960ca1f7ceSYan, Zheng err_unlock: 897940100a4SChris Mason mutex_unlock(&inode->i_mutex); 898940100a4SChris Mason return ret; 899f46b5a66SChristoph Hellwig } 900f46b5a66SChristoph Hellwig 90176dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 90276dda93cSYan, Zheng void __user *arg) 903f46b5a66SChristoph Hellwig { 904f46b5a66SChristoph Hellwig u64 new_size; 905f46b5a66SChristoph Hellwig u64 old_size; 906f46b5a66SChristoph Hellwig u64 devid = 1; 907f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 908f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 909f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 910f46b5a66SChristoph Hellwig char *sizestr; 911f46b5a66SChristoph Hellwig char *devstr = NULL; 912f46b5a66SChristoph Hellwig int ret = 0; 913f46b5a66SChristoph Hellwig int mod = 0; 914f46b5a66SChristoph Hellwig 915c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 916c146afadSYan Zheng return -EROFS; 917c146afadSYan Zheng 918e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 919e441d54dSChris Mason return -EPERM; 920e441d54dSChris Mason 921dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 922dae7b665SLi Zefan if (IS_ERR(vol_args)) 923dae7b665SLi Zefan return PTR_ERR(vol_args); 9245516e595SMark Fasheh 9255516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 926f46b5a66SChristoph Hellwig 9277d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 928f46b5a66SChristoph Hellwig sizestr = vol_args->name; 929f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 930f46b5a66SChristoph Hellwig if (devstr) { 931f46b5a66SChristoph Hellwig char *end; 932f46b5a66SChristoph Hellwig sizestr = devstr + 1; 933f46b5a66SChristoph Hellwig *devstr = '\0'; 934f46b5a66SChristoph Hellwig devstr = vol_args->name; 935f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 93621380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 93721380931SJoel Becker (unsigned long long)devid); 938f46b5a66SChristoph Hellwig } 9392b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 940f46b5a66SChristoph Hellwig if (!device) { 94121380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 94221380931SJoel Becker (unsigned long long)devid); 943f46b5a66SChristoph Hellwig ret = -EINVAL; 944f46b5a66SChristoph Hellwig goto out_unlock; 945f46b5a66SChristoph Hellwig } 946f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 947f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 948f46b5a66SChristoph Hellwig else { 949f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 950f46b5a66SChristoph Hellwig mod = -1; 951f46b5a66SChristoph Hellwig sizestr++; 952f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 953f46b5a66SChristoph Hellwig mod = 1; 954f46b5a66SChristoph Hellwig sizestr++; 955f46b5a66SChristoph Hellwig } 95691748467SAkinobu Mita new_size = memparse(sizestr, NULL); 957f46b5a66SChristoph Hellwig if (new_size == 0) { 958f46b5a66SChristoph Hellwig ret = -EINVAL; 959f46b5a66SChristoph Hellwig goto out_unlock; 960f46b5a66SChristoph Hellwig } 961f46b5a66SChristoph Hellwig } 962f46b5a66SChristoph Hellwig 963f46b5a66SChristoph Hellwig old_size = device->total_bytes; 964f46b5a66SChristoph Hellwig 965f46b5a66SChristoph Hellwig if (mod < 0) { 966f46b5a66SChristoph Hellwig if (new_size > old_size) { 967f46b5a66SChristoph Hellwig ret = -EINVAL; 968f46b5a66SChristoph Hellwig goto out_unlock; 969f46b5a66SChristoph Hellwig } 970f46b5a66SChristoph Hellwig new_size = old_size - new_size; 971f46b5a66SChristoph Hellwig } else if (mod > 0) { 972f46b5a66SChristoph Hellwig new_size = old_size + new_size; 973f46b5a66SChristoph Hellwig } 974f46b5a66SChristoph Hellwig 975f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 976f46b5a66SChristoph Hellwig ret = -EINVAL; 977f46b5a66SChristoph Hellwig goto out_unlock; 978f46b5a66SChristoph Hellwig } 979f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 980f46b5a66SChristoph Hellwig ret = -EFBIG; 981f46b5a66SChristoph Hellwig goto out_unlock; 982f46b5a66SChristoph Hellwig } 983f46b5a66SChristoph Hellwig 984f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 985f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 986f46b5a66SChristoph Hellwig 987f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 988f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 989f46b5a66SChristoph Hellwig 990f46b5a66SChristoph Hellwig if (new_size > old_size) { 991a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 99298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 99398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 99498d5dc13STsutomu Itoh goto out_unlock; 99598d5dc13STsutomu Itoh } 996f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 997f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 998f46b5a66SChristoph Hellwig } else { 999f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1000f46b5a66SChristoph Hellwig } 1001f46b5a66SChristoph Hellwig 1002f46b5a66SChristoph Hellwig out_unlock: 10037d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 1004f46b5a66SChristoph Hellwig kfree(vol_args); 1005f46b5a66SChristoph Hellwig return ret; 1006f46b5a66SChristoph Hellwig } 1007f46b5a66SChristoph Hellwig 100872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 100972fd032eSSage Weil char *name, 101072fd032eSSage Weil unsigned long fd, 101172fd032eSSage Weil int subvol, 1012b83cc969SLi Zefan u64 *transid, 1013b83cc969SLi Zefan bool readonly) 1014f46b5a66SChristoph Hellwig { 1015cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 10163de4586cSChris Mason struct file *src_file; 1017f46b5a66SChristoph Hellwig int namelen; 10183de4586cSChris Mason int ret = 0; 1019f46b5a66SChristoph Hellwig 1020c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1021c146afadSYan Zheng return -EROFS; 1022c146afadSYan Zheng 102372fd032eSSage Weil namelen = strlen(name); 102472fd032eSSage Weil if (strchr(name, '/')) { 1025f46b5a66SChristoph Hellwig ret = -EINVAL; 1026f46b5a66SChristoph Hellwig goto out; 1027f46b5a66SChristoph Hellwig } 1028f46b5a66SChristoph Hellwig 10293de4586cSChris Mason if (subvol) { 103072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1031b83cc969SLi Zefan NULL, transid, readonly); 1032cb8e7090SChristoph Hellwig } else { 10333de4586cSChris Mason struct inode *src_inode; 103472fd032eSSage Weil src_file = fget(fd); 10353de4586cSChris Mason if (!src_file) { 10363de4586cSChris Mason ret = -EINVAL; 10373de4586cSChris Mason goto out; 10383de4586cSChris Mason } 10393de4586cSChris Mason 10403de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 10413de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1042d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1043d397712bSChris Mason "another FS\n"); 10443de4586cSChris Mason ret = -EINVAL; 10453de4586cSChris Mason fput(src_file); 10463de4586cSChris Mason goto out; 10473de4586cSChris Mason } 104872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 104972fd032eSSage Weil BTRFS_I(src_inode)->root, 1050b83cc969SLi Zefan transid, readonly); 10513de4586cSChris Mason fput(src_file); 1052cb8e7090SChristoph Hellwig } 1053f46b5a66SChristoph Hellwig out: 105472fd032eSSage Weil return ret; 105572fd032eSSage Weil } 105672fd032eSSage Weil 105772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1058fa0d2b9bSLi Zefan void __user *arg, int subvol) 105972fd032eSSage Weil { 1060fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 106172fd032eSSage Weil int ret; 106272fd032eSSage Weil 1063fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1064fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1065fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1066fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1067fa0d2b9bSLi Zefan 1068fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1069b83cc969SLi Zefan vol_args->fd, subvol, 1070b83cc969SLi Zefan NULL, false); 1071fa0d2b9bSLi Zefan 1072fa0d2b9bSLi Zefan kfree(vol_args); 1073fa0d2b9bSLi Zefan return ret; 1074fa0d2b9bSLi Zefan } 1075fa0d2b9bSLi Zefan 1076fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1077fa0d2b9bSLi Zefan void __user *arg, int subvol) 1078fa0d2b9bSLi Zefan { 1079fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1080fa0d2b9bSLi Zefan int ret; 1081fdfb1e4fSLi Zefan u64 transid = 0; 1082fdfb1e4fSLi Zefan u64 *ptr = NULL; 1083b83cc969SLi Zefan bool readonly = false; 108472fd032eSSage Weil 1085fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1086fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1087fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1088fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1089fdfb1e4fSLi Zefan 1090b83cc969SLi Zefan if (vol_args->flags & 1091b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1092b83cc969SLi Zefan ret = -EOPNOTSUPP; 1093fdfb1e4fSLi Zefan goto out; 1094fdfb1e4fSLi Zefan } 1095fdfb1e4fSLi Zefan 1096fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1097fdfb1e4fSLi Zefan ptr = &transid; 1098b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1099b83cc969SLi Zefan readonly = true; 110075eaa0e2SSage Weil 1101fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1102b83cc969SLi Zefan vol_args->fd, subvol, 1103b83cc969SLi Zefan ptr, readonly); 110475eaa0e2SSage Weil 1105fdfb1e4fSLi Zefan if (ret == 0 && ptr && 110675eaa0e2SSage Weil copy_to_user(arg + 1107fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1108fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 110975eaa0e2SSage Weil ret = -EFAULT; 1110fdfb1e4fSLi Zefan out: 1111f46b5a66SChristoph Hellwig kfree(vol_args); 1112f46b5a66SChristoph Hellwig return ret; 1113f46b5a66SChristoph Hellwig } 1114f46b5a66SChristoph Hellwig 11150caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 11160caa102dSLi Zefan void __user *arg) 11170caa102dSLi Zefan { 11180caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11190caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11200caa102dSLi Zefan int ret = 0; 11210caa102dSLi Zefan u64 flags = 0; 11220caa102dSLi Zefan 11230caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11240caa102dSLi Zefan return -EINVAL; 11250caa102dSLi Zefan 11260caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 11270caa102dSLi Zefan if (btrfs_root_readonly(root)) 11280caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 11290caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 11300caa102dSLi Zefan 11310caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 11320caa102dSLi Zefan ret = -EFAULT; 11330caa102dSLi Zefan 11340caa102dSLi Zefan return ret; 11350caa102dSLi Zefan } 11360caa102dSLi Zefan 11370caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 11380caa102dSLi Zefan void __user *arg) 11390caa102dSLi Zefan { 11400caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11410caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11420caa102dSLi Zefan struct btrfs_trans_handle *trans; 11430caa102dSLi Zefan u64 root_flags; 11440caa102dSLi Zefan u64 flags; 11450caa102dSLi Zefan int ret = 0; 11460caa102dSLi Zefan 11470caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 11480caa102dSLi Zefan return -EROFS; 11490caa102dSLi Zefan 11500caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11510caa102dSLi Zefan return -EINVAL; 11520caa102dSLi Zefan 11530caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 11540caa102dSLi Zefan return -EFAULT; 11550caa102dSLi Zefan 1156b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 11570caa102dSLi Zefan return -EINVAL; 11580caa102dSLi Zefan 11590caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 11600caa102dSLi Zefan return -EOPNOTSUPP; 11610caa102dSLi Zefan 1162b4dc2b8cSLi Zefan if (!is_owner_or_cap(inode)) 1163b4dc2b8cSLi Zefan return -EACCES; 1164b4dc2b8cSLi Zefan 11650caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 11660caa102dSLi Zefan 11670caa102dSLi Zefan /* nothing to do */ 11680caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 11690caa102dSLi Zefan goto out; 11700caa102dSLi Zefan 11710caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 11720caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 11730caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11740caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 11750caa102dSLi Zefan else 11760caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11770caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 11780caa102dSLi Zefan 11790caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 11800caa102dSLi Zefan if (IS_ERR(trans)) { 11810caa102dSLi Zefan ret = PTR_ERR(trans); 11820caa102dSLi Zefan goto out_reset; 11830caa102dSLi Zefan } 11840caa102dSLi Zefan 1185b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 11860caa102dSLi Zefan &root->root_key, &root->root_item); 11870caa102dSLi Zefan 11880caa102dSLi Zefan btrfs_commit_transaction(trans, root); 11890caa102dSLi Zefan out_reset: 11900caa102dSLi Zefan if (ret) 11910caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 11920caa102dSLi Zefan out: 11930caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 11940caa102dSLi Zefan return ret; 11950caa102dSLi Zefan } 11960caa102dSLi Zefan 119776dda93cSYan, Zheng /* 119876dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 119976dda93cSYan, Zheng */ 120076dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 120176dda93cSYan, Zheng { 120276dda93cSYan, Zheng struct btrfs_path *path; 120376dda93cSYan, Zheng struct btrfs_key key; 120476dda93cSYan, Zheng int ret; 120576dda93cSYan, Zheng 120676dda93cSYan, Zheng path = btrfs_alloc_path(); 120776dda93cSYan, Zheng if (!path) 120876dda93cSYan, Zheng return -ENOMEM; 120976dda93cSYan, Zheng 121076dda93cSYan, Zheng key.objectid = root->root_key.objectid; 121176dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 121276dda93cSYan, Zheng key.offset = (u64)-1; 121376dda93cSYan, Zheng 121476dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 121576dda93cSYan, Zheng &key, path, 0, 0); 121676dda93cSYan, Zheng if (ret < 0) 121776dda93cSYan, Zheng goto out; 121876dda93cSYan, Zheng BUG_ON(ret == 0); 121976dda93cSYan, Zheng 122076dda93cSYan, Zheng ret = 0; 122176dda93cSYan, Zheng if (path->slots[0] > 0) { 122276dda93cSYan, Zheng path->slots[0]--; 122376dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 122476dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 122576dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 122676dda93cSYan, Zheng ret = -ENOTEMPTY; 122776dda93cSYan, Zheng } 122876dda93cSYan, Zheng out: 122976dda93cSYan, Zheng btrfs_free_path(path); 123076dda93cSYan, Zheng return ret; 123176dda93cSYan, Zheng } 123276dda93cSYan, Zheng 1233ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1234ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1235ac8e9819SChris Mason { 1236abc6e134SChris Mason struct btrfs_key test; 1237abc6e134SChris Mason int ret; 1238abc6e134SChris Mason 1239abc6e134SChris Mason test.objectid = sk->min_objectid; 1240abc6e134SChris Mason test.type = sk->min_type; 1241abc6e134SChris Mason test.offset = sk->min_offset; 1242abc6e134SChris Mason 1243abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1244abc6e134SChris Mason if (ret < 0) 1245ac8e9819SChris Mason return 0; 1246abc6e134SChris Mason 1247abc6e134SChris Mason test.objectid = sk->max_objectid; 1248abc6e134SChris Mason test.type = sk->max_type; 1249abc6e134SChris Mason test.offset = sk->max_offset; 1250abc6e134SChris Mason 1251abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1252abc6e134SChris Mason if (ret > 0) 1253ac8e9819SChris Mason return 0; 1254ac8e9819SChris Mason return 1; 1255ac8e9819SChris Mason } 1256ac8e9819SChris Mason 1257ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1258ac8e9819SChris Mason struct btrfs_path *path, 1259ac8e9819SChris Mason struct btrfs_key *key, 1260ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1261ac8e9819SChris Mason char *buf, 1262ac8e9819SChris Mason unsigned long *sk_offset, 1263ac8e9819SChris Mason int *num_found) 1264ac8e9819SChris Mason { 1265ac8e9819SChris Mason u64 found_transid; 1266ac8e9819SChris Mason struct extent_buffer *leaf; 1267ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1268ac8e9819SChris Mason unsigned long item_off; 1269ac8e9819SChris Mason unsigned long item_len; 1270ac8e9819SChris Mason int nritems; 1271ac8e9819SChris Mason int i; 1272ac8e9819SChris Mason int slot; 1273ac8e9819SChris Mason int found = 0; 1274ac8e9819SChris Mason int ret = 0; 1275ac8e9819SChris Mason 1276ac8e9819SChris Mason leaf = path->nodes[0]; 1277ac8e9819SChris Mason slot = path->slots[0]; 1278ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1279ac8e9819SChris Mason 1280ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1281ac8e9819SChris Mason i = nritems; 1282ac8e9819SChris Mason goto advance_key; 1283ac8e9819SChris Mason } 1284ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1285ac8e9819SChris Mason 1286ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1287ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1288ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1289ac8e9819SChris Mason 1290ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1291ac8e9819SChris Mason item_len = 0; 1292ac8e9819SChris Mason 1293ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1294ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1295ac8e9819SChris Mason ret = 1; 1296ac8e9819SChris Mason goto overflow; 1297ac8e9819SChris Mason } 1298ac8e9819SChris Mason 1299ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1300ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1301ac8e9819SChris Mason continue; 1302ac8e9819SChris Mason 1303ac8e9819SChris Mason sh.objectid = key->objectid; 1304ac8e9819SChris Mason sh.offset = key->offset; 1305ac8e9819SChris Mason sh.type = key->type; 1306ac8e9819SChris Mason sh.len = item_len; 1307ac8e9819SChris Mason sh.transid = found_transid; 1308ac8e9819SChris Mason 1309ac8e9819SChris Mason /* copy search result header */ 1310ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1311ac8e9819SChris Mason *sk_offset += sizeof(sh); 1312ac8e9819SChris Mason 1313ac8e9819SChris Mason if (item_len) { 1314ac8e9819SChris Mason char *p = buf + *sk_offset; 1315ac8e9819SChris Mason /* copy the item */ 1316ac8e9819SChris Mason read_extent_buffer(leaf, p, 1317ac8e9819SChris Mason item_off, item_len); 1318ac8e9819SChris Mason *sk_offset += item_len; 1319ac8e9819SChris Mason } 132090fdde14SChris Mason found++; 1321ac8e9819SChris Mason 1322ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1323ac8e9819SChris Mason break; 1324ac8e9819SChris Mason } 1325ac8e9819SChris Mason advance_key: 1326ac8e9819SChris Mason ret = 0; 1327abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1328abc6e134SChris Mason key->offset++; 1329abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1330abc6e134SChris Mason key->offset = 0; 1331abc6e134SChris Mason key->type++; 1332abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1333abc6e134SChris Mason key->offset = 0; 1334abc6e134SChris Mason key->type = 0; 1335abc6e134SChris Mason key->objectid++; 1336abc6e134SChris Mason } else 1337abc6e134SChris Mason ret = 1; 1338ac8e9819SChris Mason overflow: 1339ac8e9819SChris Mason *num_found += found; 1340ac8e9819SChris Mason return ret; 1341ac8e9819SChris Mason } 1342ac8e9819SChris Mason 1343ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1344ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1345ac8e9819SChris Mason { 1346ac8e9819SChris Mason struct btrfs_root *root; 1347ac8e9819SChris Mason struct btrfs_key key; 1348ac8e9819SChris Mason struct btrfs_key max_key; 1349ac8e9819SChris Mason struct btrfs_path *path; 1350ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1351ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1352ac8e9819SChris Mason int ret; 1353ac8e9819SChris Mason int num_found = 0; 1354ac8e9819SChris Mason unsigned long sk_offset = 0; 1355ac8e9819SChris Mason 1356ac8e9819SChris Mason path = btrfs_alloc_path(); 1357ac8e9819SChris Mason if (!path) 1358ac8e9819SChris Mason return -ENOMEM; 1359ac8e9819SChris Mason 1360ac8e9819SChris Mason if (sk->tree_id == 0) { 1361ac8e9819SChris Mason /* search the root of the inode that was passed */ 1362ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1363ac8e9819SChris Mason } else { 1364ac8e9819SChris Mason key.objectid = sk->tree_id; 1365ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1366ac8e9819SChris Mason key.offset = (u64)-1; 1367ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1368ac8e9819SChris Mason if (IS_ERR(root)) { 1369ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1370ac8e9819SChris Mason sk->tree_id); 1371ac8e9819SChris Mason btrfs_free_path(path); 1372ac8e9819SChris Mason return -ENOENT; 1373ac8e9819SChris Mason } 1374ac8e9819SChris Mason } 1375ac8e9819SChris Mason 1376ac8e9819SChris Mason key.objectid = sk->min_objectid; 1377ac8e9819SChris Mason key.type = sk->min_type; 1378ac8e9819SChris Mason key.offset = sk->min_offset; 1379ac8e9819SChris Mason 1380ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1381ac8e9819SChris Mason max_key.type = sk->max_type; 1382ac8e9819SChris Mason max_key.offset = sk->max_offset; 1383ac8e9819SChris Mason 1384ac8e9819SChris Mason path->keep_locks = 1; 1385ac8e9819SChris Mason 1386ac8e9819SChris Mason while(1) { 1387ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1388ac8e9819SChris Mason sk->min_transid); 1389ac8e9819SChris Mason if (ret != 0) { 1390ac8e9819SChris Mason if (ret > 0) 1391ac8e9819SChris Mason ret = 0; 1392ac8e9819SChris Mason goto err; 1393ac8e9819SChris Mason } 1394ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1395ac8e9819SChris Mason &sk_offset, &num_found); 1396ac8e9819SChris Mason btrfs_release_path(root, path); 1397ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1398ac8e9819SChris Mason break; 1399ac8e9819SChris Mason 1400ac8e9819SChris Mason } 1401ac8e9819SChris Mason ret = 0; 1402ac8e9819SChris Mason err: 1403ac8e9819SChris Mason sk->nr_items = num_found; 1404ac8e9819SChris Mason btrfs_free_path(path); 1405ac8e9819SChris Mason return ret; 1406ac8e9819SChris Mason } 1407ac8e9819SChris Mason 1408ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1409ac8e9819SChris Mason void __user *argp) 1410ac8e9819SChris Mason { 1411ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1412ac8e9819SChris Mason struct inode *inode; 1413ac8e9819SChris Mason int ret; 1414ac8e9819SChris Mason 1415ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1416ac8e9819SChris Mason return -EPERM; 1417ac8e9819SChris Mason 14182354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 14192354d08fSJulia Lawall if (IS_ERR(args)) 14202354d08fSJulia Lawall return PTR_ERR(args); 1421ac8e9819SChris Mason 1422ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1423ac8e9819SChris Mason ret = search_ioctl(inode, args); 1424ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1425ac8e9819SChris Mason ret = -EFAULT; 1426ac8e9819SChris Mason kfree(args); 1427ac8e9819SChris Mason return ret; 1428ac8e9819SChris Mason } 1429ac8e9819SChris Mason 143098d377a0STARUISI Hiroaki /* 1431ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1432ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 143398d377a0STARUISI Hiroaki */ 143498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 143598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 143698d377a0STARUISI Hiroaki { 143798d377a0STARUISI Hiroaki struct btrfs_root *root; 143898d377a0STARUISI Hiroaki struct btrfs_key key; 1439ac8e9819SChris Mason char *ptr; 144098d377a0STARUISI Hiroaki int ret = -1; 144198d377a0STARUISI Hiroaki int slot; 144298d377a0STARUISI Hiroaki int len; 144398d377a0STARUISI Hiroaki int total_len = 0; 144498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 144598d377a0STARUISI Hiroaki struct extent_buffer *l; 144698d377a0STARUISI Hiroaki struct btrfs_path *path; 144798d377a0STARUISI Hiroaki 144898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 144998d377a0STARUISI Hiroaki name[0]='\0'; 145098d377a0STARUISI Hiroaki return 0; 145198d377a0STARUISI Hiroaki } 145298d377a0STARUISI Hiroaki 145398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 145498d377a0STARUISI Hiroaki if (!path) 145598d377a0STARUISI Hiroaki return -ENOMEM; 145698d377a0STARUISI Hiroaki 1457ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 145898d377a0STARUISI Hiroaki 145998d377a0STARUISI Hiroaki key.objectid = tree_id; 146098d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 146198d377a0STARUISI Hiroaki key.offset = (u64)-1; 146298d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 146398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 146498d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 14658ad6fcabSChris Mason ret = -ENOENT; 14668ad6fcabSChris Mason goto out; 146798d377a0STARUISI Hiroaki } 146898d377a0STARUISI Hiroaki 146998d377a0STARUISI Hiroaki key.objectid = dirid; 147098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 14718ad6fcabSChris Mason key.offset = (u64)-1; 147298d377a0STARUISI Hiroaki 147398d377a0STARUISI Hiroaki while(1) { 147498d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 147598d377a0STARUISI Hiroaki if (ret < 0) 147698d377a0STARUISI Hiroaki goto out; 147798d377a0STARUISI Hiroaki 147898d377a0STARUISI Hiroaki l = path->nodes[0]; 147998d377a0STARUISI Hiroaki slot = path->slots[0]; 14808ad6fcabSChris Mason if (ret > 0 && slot > 0) 14818ad6fcabSChris Mason slot--; 148298d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 148398d377a0STARUISI Hiroaki 148498d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1485ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1486ac8e9819SChris Mason ret = -ENOENT; 148798d377a0STARUISI Hiroaki goto out; 1488ac8e9819SChris Mason } 148998d377a0STARUISI Hiroaki 149098d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 149198d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 149298d377a0STARUISI Hiroaki ptr -= len + 1; 149398d377a0STARUISI Hiroaki total_len += len + 1; 1494ac8e9819SChris Mason if (ptr < name) 149598d377a0STARUISI Hiroaki goto out; 149698d377a0STARUISI Hiroaki 149798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 149898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 149998d377a0STARUISI Hiroaki 150098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 150198d377a0STARUISI Hiroaki break; 150298d377a0STARUISI Hiroaki 150398d377a0STARUISI Hiroaki btrfs_release_path(root, path); 150498d377a0STARUISI Hiroaki key.objectid = key.offset; 15058ad6fcabSChris Mason key.offset = (u64)-1; 150698d377a0STARUISI Hiroaki dirid = key.objectid; 150798d377a0STARUISI Hiroaki 150898d377a0STARUISI Hiroaki } 1509ac8e9819SChris Mason if (ptr < name) 151098d377a0STARUISI Hiroaki goto out; 1511ac8e9819SChris Mason memcpy(name, ptr, total_len); 151298d377a0STARUISI Hiroaki name[total_len]='\0'; 151398d377a0STARUISI Hiroaki ret = 0; 151498d377a0STARUISI Hiroaki out: 151598d377a0STARUISI Hiroaki btrfs_free_path(path); 1516ac8e9819SChris Mason return ret; 1517ac8e9819SChris Mason } 1518ac8e9819SChris Mason 1519ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1520ac8e9819SChris Mason void __user *argp) 1521ac8e9819SChris Mason { 1522ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1523ac8e9819SChris Mason struct inode *inode; 1524ac8e9819SChris Mason int ret; 1525ac8e9819SChris Mason 1526ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1527ac8e9819SChris Mason return -EPERM; 1528ac8e9819SChris Mason 15292354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 15302354d08fSJulia Lawall if (IS_ERR(args)) 15312354d08fSJulia Lawall return PTR_ERR(args); 1532c2b96929SDan Carpenter 1533ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1534ac8e9819SChris Mason 15351b53ac4dSChris Mason if (args->treeid == 0) 15361b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 15371b53ac4dSChris Mason 1538ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1539ac8e9819SChris Mason args->treeid, args->objectid, 1540ac8e9819SChris Mason args->name); 1541ac8e9819SChris Mason 1542ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1543ac8e9819SChris Mason ret = -EFAULT; 1544ac8e9819SChris Mason 1545ac8e9819SChris Mason kfree(args); 154698d377a0STARUISI Hiroaki return ret; 154798d377a0STARUISI Hiroaki } 154898d377a0STARUISI Hiroaki 154976dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 155076dda93cSYan, Zheng void __user *arg) 155176dda93cSYan, Zheng { 155276dda93cSYan, Zheng struct dentry *parent = fdentry(file); 155376dda93cSYan, Zheng struct dentry *dentry; 155476dda93cSYan, Zheng struct inode *dir = parent->d_inode; 155576dda93cSYan, Zheng struct inode *inode; 155676dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 155776dda93cSYan, Zheng struct btrfs_root *dest = NULL; 155876dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 155976dda93cSYan, Zheng struct btrfs_trans_handle *trans; 156076dda93cSYan, Zheng int namelen; 156176dda93cSYan, Zheng int ret; 156276dda93cSYan, Zheng int err = 0; 156376dda93cSYan, Zheng 156476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 156576dda93cSYan, Zheng if (IS_ERR(vol_args)) 156676dda93cSYan, Zheng return PTR_ERR(vol_args); 156776dda93cSYan, Zheng 156876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 156976dda93cSYan, Zheng namelen = strlen(vol_args->name); 157076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 157176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 157276dda93cSYan, Zheng err = -EINVAL; 157376dda93cSYan, Zheng goto out; 157476dda93cSYan, Zheng } 157576dda93cSYan, Zheng 157676dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 157776dda93cSYan, Zheng if (err) 157876dda93cSYan, Zheng goto out; 157976dda93cSYan, Zheng 158076dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 158176dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 158276dda93cSYan, Zheng if (IS_ERR(dentry)) { 158376dda93cSYan, Zheng err = PTR_ERR(dentry); 158476dda93cSYan, Zheng goto out_unlock_dir; 158576dda93cSYan, Zheng } 158676dda93cSYan, Zheng 158776dda93cSYan, Zheng if (!dentry->d_inode) { 158876dda93cSYan, Zheng err = -ENOENT; 158976dda93cSYan, Zheng goto out_dput; 159076dda93cSYan, Zheng } 159176dda93cSYan, Zheng 159276dda93cSYan, Zheng inode = dentry->d_inode; 15934260f7c7SSage Weil dest = BTRFS_I(inode)->root; 15944260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 15954260f7c7SSage Weil /* 15964260f7c7SSage Weil * Regular user. Only allow this with a special mount 15974260f7c7SSage Weil * option, when the user has write+exec access to the 15984260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 15994260f7c7SSage Weil * allowed. 16004260f7c7SSage Weil * 16014260f7c7SSage Weil * Note that this is _not_ check that the subvol is 16024260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 16034260f7c7SSage Weil * otherwise be able to delete. 16044260f7c7SSage Weil * 16054260f7c7SSage Weil * Users who want to delete empty subvols should try 16064260f7c7SSage Weil * rmdir(2). 16074260f7c7SSage Weil */ 16084260f7c7SSage Weil err = -EPERM; 16094260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 16104260f7c7SSage Weil goto out_dput; 16114260f7c7SSage Weil 16124260f7c7SSage Weil /* 16134260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 16144260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 16154260f7c7SSage Weil * must be called on the dentry referencing the root 16164260f7c7SSage Weil * of the subvol, not a random directory contained 16174260f7c7SSage Weil * within it. 16184260f7c7SSage Weil */ 16194260f7c7SSage Weil err = -EINVAL; 16204260f7c7SSage Weil if (root == dest) 16214260f7c7SSage Weil goto out_dput; 16224260f7c7SSage Weil 16234260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 16244260f7c7SSage Weil if (err) 16254260f7c7SSage Weil goto out_dput; 16264260f7c7SSage Weil 16274260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 16284260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 16294260f7c7SSage Weil if (err) 16304260f7c7SSage Weil goto out_dput; 16314260f7c7SSage Weil } 16324260f7c7SSage Weil 163376dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 163476dda93cSYan, Zheng err = -EINVAL; 163576dda93cSYan, Zheng goto out_dput; 163676dda93cSYan, Zheng } 163776dda93cSYan, Zheng 163876dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 163976dda93cSYan, Zheng err = d_invalidate(dentry); 164076dda93cSYan, Zheng if (err) 164176dda93cSYan, Zheng goto out_unlock; 164276dda93cSYan, Zheng 164376dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 164476dda93cSYan, Zheng 164576dda93cSYan, Zheng err = may_destroy_subvol(dest); 164676dda93cSYan, Zheng if (err) 164776dda93cSYan, Zheng goto out_up_write; 164876dda93cSYan, Zheng 1649a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1650a22285a6SYan, Zheng if (IS_ERR(trans)) { 1651a22285a6SYan, Zheng err = PTR_ERR(trans); 1652d327099aSDan Carpenter goto out_up_write; 1653a22285a6SYan, Zheng } 1654a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1655a22285a6SYan, Zheng 165676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 165776dda93cSYan, Zheng dest->root_key.objectid, 165876dda93cSYan, Zheng dentry->d_name.name, 165976dda93cSYan, Zheng dentry->d_name.len); 166076dda93cSYan, Zheng BUG_ON(ret); 166176dda93cSYan, Zheng 166276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 166376dda93cSYan, Zheng 166476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 166576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 166676dda93cSYan, Zheng dest->root_item.drop_level = 0; 166776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 166876dda93cSYan, Zheng 1669d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 167076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 167176dda93cSYan, Zheng root->fs_info->tree_root, 167276dda93cSYan, Zheng dest->root_key.objectid); 167376dda93cSYan, Zheng BUG_ON(ret); 1674d68fc57bSYan, Zheng } 167576dda93cSYan, Zheng 1676531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 167776dda93cSYan, Zheng BUG_ON(ret); 167876dda93cSYan, Zheng inode->i_flags |= S_DEAD; 167976dda93cSYan, Zheng out_up_write: 168076dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 168176dda93cSYan, Zheng out_unlock: 168276dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 168376dda93cSYan, Zheng if (!err) { 1684efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 168576dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 168676dda93cSYan, Zheng d_delete(dentry); 168776dda93cSYan, Zheng } 168876dda93cSYan, Zheng out_dput: 168976dda93cSYan, Zheng dput(dentry); 169076dda93cSYan, Zheng out_unlock_dir: 169176dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 169276dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 169376dda93cSYan, Zheng out: 169476dda93cSYan, Zheng kfree(vol_args); 169576dda93cSYan, Zheng return err; 169676dda93cSYan, Zheng } 169776dda93cSYan, Zheng 16981e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1699f46b5a66SChristoph Hellwig { 1700f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1701f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 17021e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1703c146afadSYan Zheng int ret; 1704c146afadSYan Zheng 1705b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1706b83cc969SLi Zefan return -EROFS; 1707b83cc969SLi Zefan 1708c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1709c146afadSYan Zheng if (ret) 1710c146afadSYan Zheng return ret; 1711f46b5a66SChristoph Hellwig 1712f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1713f46b5a66SChristoph Hellwig case S_IFDIR: 1714e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1715e441d54dSChris Mason ret = -EPERM; 1716e441d54dSChris Mason goto out; 1717e441d54dSChris Mason } 17188929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 17198929ecfaSYan, Zheng if (ret) 17208929ecfaSYan, Zheng goto out; 17218929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1722f46b5a66SChristoph Hellwig break; 1723f46b5a66SChristoph Hellwig case S_IFREG: 1724e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1725e441d54dSChris Mason ret = -EINVAL; 1726e441d54dSChris Mason goto out; 1727e441d54dSChris Mason } 17281e701a32SChris Mason 17291e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 17301e701a32SChris Mason if (!range) { 17311e701a32SChris Mason ret = -ENOMEM; 17321e701a32SChris Mason goto out; 17331e701a32SChris Mason } 17341e701a32SChris Mason 17351e701a32SChris Mason if (argp) { 17361e701a32SChris Mason if (copy_from_user(range, argp, 17371e701a32SChris Mason sizeof(*range))) { 17381e701a32SChris Mason ret = -EFAULT; 17391e701a32SChris Mason kfree(range); 1740683be16eSDan Carpenter goto out; 17411e701a32SChris Mason } 17421e701a32SChris Mason /* compression requires us to start the IO */ 17431e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 17441e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 17451e701a32SChris Mason range->extent_thresh = (u32)-1; 17461e701a32SChris Mason } 17471e701a32SChris Mason } else { 17481e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 17491e701a32SChris Mason range->len = (u64)-1; 17501e701a32SChris Mason } 17518929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 17521e701a32SChris Mason kfree(range); 1753f46b5a66SChristoph Hellwig break; 17548929ecfaSYan, Zheng default: 17558929ecfaSYan, Zheng ret = -EINVAL; 1756f46b5a66SChristoph Hellwig } 1757e441d54dSChris Mason out: 1758ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1759e441d54dSChris Mason return ret; 1760f46b5a66SChristoph Hellwig } 1761f46b5a66SChristoph Hellwig 1762b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1763f46b5a66SChristoph Hellwig { 1764f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1765f46b5a66SChristoph Hellwig int ret; 1766f46b5a66SChristoph Hellwig 1767e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1768e441d54dSChris Mason return -EPERM; 1769e441d54dSChris Mason 1770dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1771dae7b665SLi Zefan if (IS_ERR(vol_args)) 1772dae7b665SLi Zefan return PTR_ERR(vol_args); 1773f46b5a66SChristoph Hellwig 17745516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1775f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1776f46b5a66SChristoph Hellwig 1777f46b5a66SChristoph Hellwig kfree(vol_args); 1778f46b5a66SChristoph Hellwig return ret; 1779f46b5a66SChristoph Hellwig } 1780f46b5a66SChristoph Hellwig 1781b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1782f46b5a66SChristoph Hellwig { 1783f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1784f46b5a66SChristoph Hellwig int ret; 1785f46b5a66SChristoph Hellwig 1786e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1787e441d54dSChris Mason return -EPERM; 1788e441d54dSChris Mason 1789c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1790c146afadSYan Zheng return -EROFS; 1791c146afadSYan Zheng 1792dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1793dae7b665SLi Zefan if (IS_ERR(vol_args)) 1794dae7b665SLi Zefan return PTR_ERR(vol_args); 1795f46b5a66SChristoph Hellwig 17965516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1797f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1798f46b5a66SChristoph Hellwig 1799f46b5a66SChristoph Hellwig kfree(vol_args); 1800f46b5a66SChristoph Hellwig return ret; 1801f46b5a66SChristoph Hellwig } 1802f46b5a66SChristoph Hellwig 180376dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1804b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1805f46b5a66SChristoph Hellwig { 1806f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1807f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1808f46b5a66SChristoph Hellwig struct file *src_file; 1809f46b5a66SChristoph Hellwig struct inode *src; 1810f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1811f46b5a66SChristoph Hellwig struct btrfs_path *path; 1812f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1813ae01a0abSYan Zheng char *buf; 1814ae01a0abSYan Zheng struct btrfs_key key; 1815f46b5a66SChristoph Hellwig u32 nritems; 1816f46b5a66SChristoph Hellwig int slot; 1817ae01a0abSYan Zheng int ret; 1818c5c9cd4dSSage Weil u64 len = olen; 1819c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1820c5c9cd4dSSage Weil u64 hint_byte; 1821d20f7043SChris Mason 1822c5c9cd4dSSage Weil /* 1823c5c9cd4dSSage Weil * TODO: 1824c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1825c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1826c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1827c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1828c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1829c5c9cd4dSSage Weil * they don't overlap)? 1830c5c9cd4dSSage Weil */ 1831c5c9cd4dSSage Weil 1832e441d54dSChris Mason /* the destination must be opened for writing */ 18332ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1834e441d54dSChris Mason return -EINVAL; 1835e441d54dSChris Mason 1836b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1837b83cc969SLi Zefan return -EROFS; 1838b83cc969SLi Zefan 1839c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1840c146afadSYan Zheng if (ret) 1841c146afadSYan Zheng return ret; 1842c146afadSYan Zheng 1843c5c9cd4dSSage Weil src_file = fget(srcfd); 1844ab67b7c1SYan Zheng if (!src_file) { 1845ab67b7c1SYan Zheng ret = -EBADF; 1846ab67b7c1SYan Zheng goto out_drop_write; 1847ab67b7c1SYan Zheng } 18485dc64164SDan Rosenberg 1849f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1850f46b5a66SChristoph Hellwig 1851c5c9cd4dSSage Weil ret = -EINVAL; 1852c5c9cd4dSSage Weil if (src == inode) 1853c5c9cd4dSSage Weil goto out_fput; 1854c5c9cd4dSSage Weil 18555dc64164SDan Rosenberg /* the src must be open for reading */ 18565dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 18575dc64164SDan Rosenberg goto out_fput; 18585dc64164SDan Rosenberg 1859ae01a0abSYan Zheng ret = -EISDIR; 1860ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1861f46b5a66SChristoph Hellwig goto out_fput; 1862f46b5a66SChristoph Hellwig 1863ae01a0abSYan Zheng ret = -EXDEV; 1864ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1865ae01a0abSYan Zheng goto out_fput; 1866ae01a0abSYan Zheng 1867ae01a0abSYan Zheng ret = -ENOMEM; 1868ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1869ae01a0abSYan Zheng if (!buf) 1870ae01a0abSYan Zheng goto out_fput; 1871ae01a0abSYan Zheng 1872ae01a0abSYan Zheng path = btrfs_alloc_path(); 1873ae01a0abSYan Zheng if (!path) { 1874ae01a0abSYan Zheng vfree(buf); 1875ae01a0abSYan Zheng goto out_fput; 1876ae01a0abSYan Zheng } 1877ae01a0abSYan Zheng path->reada = 2; 1878ae01a0abSYan Zheng 1879f46b5a66SChristoph Hellwig if (inode < src) { 1880fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1881fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1882f46b5a66SChristoph Hellwig } else { 1883fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1884fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1885f46b5a66SChristoph Hellwig } 1886f46b5a66SChristoph Hellwig 1887c5c9cd4dSSage Weil /* determine range to clone */ 1888c5c9cd4dSSage Weil ret = -EINVAL; 18892ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1890f46b5a66SChristoph Hellwig goto out_unlock; 1891c5c9cd4dSSage Weil if (len == 0) 1892c5c9cd4dSSage Weil olen = len = src->i_size - off; 1893c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1894c5c9cd4dSSage Weil if (off + len == src->i_size) 18952a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1896c5c9cd4dSSage Weil 1897c5c9cd4dSSage Weil /* verify the end result is block aligned */ 18982a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 18992a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1900c5c9cd4dSSage Weil goto out_unlock; 1901c5c9cd4dSSage Weil 1902f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1903f46b5a66SChristoph Hellwig another, and lock file content */ 1904f46b5a66SChristoph Hellwig while (1) { 190531840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1906c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 19079a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 19089a019196SSage Weil if (!ordered && 19099a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 19109a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1911f46b5a66SChristoph Hellwig break; 1912c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1913ae01a0abSYan Zheng if (ordered) 1914ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 19159a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1916f46b5a66SChristoph Hellwig } 1917f46b5a66SChristoph Hellwig 1918c5c9cd4dSSage Weil /* clone data */ 1919f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1920ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1921ae01a0abSYan Zheng key.offset = 0; 1922f46b5a66SChristoph Hellwig 1923f46b5a66SChristoph Hellwig while (1) { 1924f46b5a66SChristoph Hellwig /* 1925f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1926f46b5a66SChristoph Hellwig * tree. 1927f46b5a66SChristoph Hellwig */ 1928a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1929f46b5a66SChristoph Hellwig if (ret < 0) 1930f46b5a66SChristoph Hellwig goto out; 1931f46b5a66SChristoph Hellwig 1932ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1933ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1934f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1935f46b5a66SChristoph Hellwig if (ret < 0) 1936f46b5a66SChristoph Hellwig goto out; 1937f46b5a66SChristoph Hellwig if (ret > 0) 1938f46b5a66SChristoph Hellwig break; 1939ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1940f46b5a66SChristoph Hellwig } 1941f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1942f46b5a66SChristoph Hellwig slot = path->slots[0]; 1943f46b5a66SChristoph Hellwig 1944ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1945d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1946f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1947f46b5a66SChristoph Hellwig break; 1948f46b5a66SChristoph Hellwig 1949c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1950c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1951c5c9cd4dSSage Weil int type; 195231840ae1SZheng Yan u32 size; 195331840ae1SZheng Yan struct btrfs_key new_key; 1954c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1955c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1956c5c9cd4dSSage Weil u8 comp; 1957b5384d48SSage Weil u64 endoff; 195831840ae1SZheng Yan 195931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 196031840ae1SZheng Yan read_extent_buffer(leaf, buf, 196131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 196231840ae1SZheng Yan size); 1963c5c9cd4dSSage Weil 1964c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1965c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1966c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1967c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1968c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1969c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1970d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1971d397712bSChris Mason extent); 1972d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1973d397712bSChris Mason extent); 1974c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1975d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1976d397712bSChris Mason extent); 1977c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1978c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1979c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1980c5c9cd4dSSage Weil extent); 1981c5c9cd4dSSage Weil } 198231840ae1SZheng Yan btrfs_release_path(root, path); 198331840ae1SZheng Yan 1984050006a7SSage Weil if (key.offset + datal <= off || 1985c5c9cd4dSSage Weil key.offset >= off+len) 1986c5c9cd4dSSage Weil goto next; 1987c5c9cd4dSSage Weil 198831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 198931840ae1SZheng Yan new_key.objectid = inode->i_ino; 19904d728ec7SLi Zefan if (off <= key.offset) 1991c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 19924d728ec7SLi Zefan else 19934d728ec7SLi Zefan new_key.offset = destoff; 1994c5c9cd4dSSage Weil 1995a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1996a22285a6SYan, Zheng if (IS_ERR(trans)) { 1997a22285a6SYan, Zheng ret = PTR_ERR(trans); 1998a22285a6SYan, Zheng goto out; 1999a22285a6SYan, Zheng } 2000a22285a6SYan, Zheng 2001c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2002c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2003a22285a6SYan, Zheng if (off > key.offset) { 2004a22285a6SYan, Zheng datao += off - key.offset; 2005a22285a6SYan, Zheng datal -= off - key.offset; 2006a22285a6SYan, Zheng } 2007a22285a6SYan, Zheng 2008a22285a6SYan, Zheng if (key.offset + datal > off + len) 2009a22285a6SYan, Zheng datal = off + len - key.offset; 2010a22285a6SYan, Zheng 2011a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2012a22285a6SYan, Zheng new_key.offset, 2013a22285a6SYan, Zheng new_key.offset + datal, 2014a22285a6SYan, Zheng &hint_byte, 1); 2015a22285a6SYan, Zheng BUG_ON(ret); 2016a22285a6SYan, Zheng 201731840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 201831840ae1SZheng Yan &new_key, size); 2019a22285a6SYan, Zheng BUG_ON(ret); 202031840ae1SZheng Yan 202131840ae1SZheng Yan leaf = path->nodes[0]; 202231840ae1SZheng Yan slot = path->slots[0]; 202331840ae1SZheng Yan write_extent_buffer(leaf, buf, 202431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 202531840ae1SZheng Yan size); 2026ae01a0abSYan Zheng 2027f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2028f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2029c5c9cd4dSSage Weil 2030c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2031c5c9cd4dSSage Weil if (!disko) 2032c5c9cd4dSSage Weil datao = 0; 2033c5c9cd4dSSage Weil 2034c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2035c5c9cd4dSSage Weil datao); 2036c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2037c5c9cd4dSSage Weil datal); 2038c5c9cd4dSSage Weil if (disko) { 2039c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2040ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 20415d4f98a2SYan Zheng disko, diskl, 0, 2042f46b5a66SChristoph Hellwig root->root_key.objectid, 20435d4f98a2SYan Zheng inode->i_ino, 20445d4f98a2SYan Zheng new_key.offset - datao); 2045ae01a0abSYan Zheng BUG_ON(ret); 2046f46b5a66SChristoph Hellwig } 2047c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2048c5c9cd4dSSage Weil u64 skip = 0; 2049c5c9cd4dSSage Weil u64 trim = 0; 2050c5c9cd4dSSage Weil if (off > key.offset) { 2051c5c9cd4dSSage Weil skip = off - key.offset; 2052c5c9cd4dSSage Weil new_key.offset += skip; 205331840ae1SZheng Yan } 2054d397712bSChris Mason 2055c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2056c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2057d397712bSChris Mason 2058c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2059c5c9cd4dSSage Weil ret = -EINVAL; 2060a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2061c5c9cd4dSSage Weil goto out; 206231840ae1SZheng Yan } 2063c5c9cd4dSSage Weil size -= skip + trim; 2064c5c9cd4dSSage Weil datal -= skip + trim; 2065a22285a6SYan, Zheng 2066a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2067a22285a6SYan, Zheng new_key.offset, 2068a22285a6SYan, Zheng new_key.offset + datal, 2069a22285a6SYan, Zheng &hint_byte, 1); 2070a22285a6SYan, Zheng BUG_ON(ret); 2071a22285a6SYan, Zheng 2072c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2073c5c9cd4dSSage Weil &new_key, size); 2074a22285a6SYan, Zheng BUG_ON(ret); 2075c5c9cd4dSSage Weil 2076c5c9cd4dSSage Weil if (skip) { 2077d397712bSChris Mason u32 start = 2078d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2079c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2080c5c9cd4dSSage Weil datal); 2081c5c9cd4dSSage Weil } 2082c5c9cd4dSSage Weil 2083c5c9cd4dSSage Weil leaf = path->nodes[0]; 2084c5c9cd4dSSage Weil slot = path->slots[0]; 2085c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2086c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2087c5c9cd4dSSage Weil size); 2088c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2089c5c9cd4dSSage Weil } 2090c5c9cd4dSSage Weil 2091c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2092a22285a6SYan, Zheng btrfs_release_path(root, path); 2093c5c9cd4dSSage Weil 2094a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2095b5384d48SSage Weil 2096b5384d48SSage Weil /* 2097b5384d48SSage Weil * we round up to the block size at eof when 2098b5384d48SSage Weil * determining which extents to clone above, 2099b5384d48SSage Weil * but shouldn't round up the file size 2100b5384d48SSage Weil */ 2101b5384d48SSage Weil endoff = new_key.offset + datal; 21025f3888ffSLi Zefan if (endoff > destoff+olen) 21035f3888ffSLi Zefan endoff = destoff+olen; 2104b5384d48SSage Weil if (endoff > inode->i_size) 2105b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2106b5384d48SSage Weil 2107a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 2108a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2109a22285a6SYan, Zheng BUG_ON(ret); 2110a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2111a22285a6SYan, Zheng } 2112c5c9cd4dSSage Weil next: 211331840ae1SZheng Yan btrfs_release_path(root, path); 2114ae01a0abSYan Zheng key.offset++; 2115ae01a0abSYan Zheng } 2116f46b5a66SChristoph Hellwig ret = 0; 2117f46b5a66SChristoph Hellwig out: 2118ae01a0abSYan Zheng btrfs_release_path(root, path); 2119c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2120f46b5a66SChristoph Hellwig out_unlock: 2121f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2122f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2123ae01a0abSYan Zheng vfree(buf); 2124ae01a0abSYan Zheng btrfs_free_path(path); 2125f46b5a66SChristoph Hellwig out_fput: 2126f46b5a66SChristoph Hellwig fput(src_file); 2127ab67b7c1SYan Zheng out_drop_write: 2128ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2129f46b5a66SChristoph Hellwig return ret; 2130f46b5a66SChristoph Hellwig } 2131f46b5a66SChristoph Hellwig 21327a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2133c5c9cd4dSSage Weil { 2134c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2135c5c9cd4dSSage Weil 21367a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2137c5c9cd4dSSage Weil return -EFAULT; 2138c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2139c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2140c5c9cd4dSSage Weil } 2141c5c9cd4dSSage Weil 2142f46b5a66SChristoph Hellwig /* 2143f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2144f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2145f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2146f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2147f46b5a66SChristoph Hellwig */ 2148b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2149f46b5a66SChristoph Hellwig { 2150f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2151f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2152f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 21531ab86aedSSage Weil int ret; 2154f46b5a66SChristoph Hellwig 21551ab86aedSSage Weil ret = -EPERM; 2156df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2157f46b5a66SChristoph Hellwig goto out; 21581ab86aedSSage Weil 21591ab86aedSSage Weil ret = -EINPROGRESS; 21601ab86aedSSage Weil if (file->private_data) 21611ab86aedSSage Weil goto out; 21629ca9ee09SSage Weil 2163b83cc969SLi Zefan ret = -EROFS; 2164b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2165b83cc969SLi Zefan goto out; 2166b83cc969SLi Zefan 2167c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2168c146afadSYan Zheng if (ret) 2169c146afadSYan Zheng goto out; 2170c146afadSYan Zheng 21719ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 21729ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 21739ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21749ca9ee09SSage Weil 2175f46b5a66SChristoph Hellwig ret = -ENOMEM; 21761ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 2177abd30bb0STsutomu Itoh if (IS_ERR(trans)) 21781ab86aedSSage Weil goto out_drop; 21791ab86aedSSage Weil 21801ab86aedSSage Weil file->private_data = trans; 21811ab86aedSSage Weil return 0; 21821ab86aedSSage Weil 21831ab86aedSSage Weil out_drop: 21841ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 21851ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 21861ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21871ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2188f46b5a66SChristoph Hellwig out: 2189f46b5a66SChristoph Hellwig return ret; 2190f46b5a66SChristoph Hellwig } 2191f46b5a66SChristoph Hellwig 21926ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 21936ef5ed0dSJosef Bacik { 21946ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 21956ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 21966ef5ed0dSJosef Bacik struct btrfs_root *new_root; 21976ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 21986ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 21996ef5ed0dSJosef Bacik struct btrfs_path *path; 22006ef5ed0dSJosef Bacik struct btrfs_key location; 22016ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 22026ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 22036ef5ed0dSJosef Bacik u64 features; 22046ef5ed0dSJosef Bacik u64 objectid = 0; 22056ef5ed0dSJosef Bacik u64 dir_id; 22066ef5ed0dSJosef Bacik 22076ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 22086ef5ed0dSJosef Bacik return -EPERM; 22096ef5ed0dSJosef Bacik 22106ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 22116ef5ed0dSJosef Bacik return -EFAULT; 22126ef5ed0dSJosef Bacik 22136ef5ed0dSJosef Bacik if (!objectid) 22146ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 22156ef5ed0dSJosef Bacik 22166ef5ed0dSJosef Bacik location.objectid = objectid; 22176ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 22186ef5ed0dSJosef Bacik location.offset = (u64)-1; 22196ef5ed0dSJosef Bacik 22206ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 22216ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 22226ef5ed0dSJosef Bacik return PTR_ERR(new_root); 22236ef5ed0dSJosef Bacik 22246ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 22256ef5ed0dSJosef Bacik return -ENOENT; 22266ef5ed0dSJosef Bacik 22276ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 22286ef5ed0dSJosef Bacik if (!path) 22296ef5ed0dSJosef Bacik return -ENOMEM; 22306ef5ed0dSJosef Bacik path->leave_spinning = 1; 22316ef5ed0dSJosef Bacik 22326ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 223398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 22346ef5ed0dSJosef Bacik btrfs_free_path(path); 223598d5dc13STsutomu Itoh return PTR_ERR(trans); 22366ef5ed0dSJosef Bacik } 22376ef5ed0dSJosef Bacik 22386ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 22396ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 22406ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2241cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 22426ef5ed0dSJosef Bacik btrfs_free_path(path); 22436ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22446ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 22456ef5ed0dSJosef Bacik "this isn't going to work\n"); 22466ef5ed0dSJosef Bacik return -ENOENT; 22476ef5ed0dSJosef Bacik } 22486ef5ed0dSJosef Bacik 22496ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 22506ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 22516ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 22526ef5ed0dSJosef Bacik btrfs_free_path(path); 22536ef5ed0dSJosef Bacik 22546ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 22556ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 22566ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 22576ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 22586ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 22596ef5ed0dSJosef Bacik } 22606ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22616ef5ed0dSJosef Bacik 22626ef5ed0dSJosef Bacik return 0; 22636ef5ed0dSJosef Bacik } 22646ef5ed0dSJosef Bacik 2265bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2266bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2267bf5fc093SJosef Bacik { 2268bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2269bf5fc093SJosef Bacik 2270bf5fc093SJosef Bacik space->total_bytes = 0; 2271bf5fc093SJosef Bacik space->used_bytes = 0; 2272bf5fc093SJosef Bacik space->flags = 0; 2273bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2274bf5fc093SJosef Bacik space->flags = block_group->flags; 2275bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2276bf5fc093SJosef Bacik space->used_bytes += 2277bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2278bf5fc093SJosef Bacik } 2279bf5fc093SJosef Bacik } 2280bf5fc093SJosef Bacik 22811406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 22821406e432SJosef Bacik { 22831406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 22841406e432SJosef Bacik struct btrfs_ioctl_space_info space; 22851406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 22867fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 228713f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 22881406e432SJosef Bacik struct btrfs_space_info *info; 2289bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2290bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2291bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2292bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2293bf5fc093SJosef Bacik int num_types = 4; 22947fde62bfSChris Mason int alloc_size; 22951406e432SJosef Bacik int ret = 0; 229651788b1bSDan Rosenberg u64 slot_count = 0; 2297bf5fc093SJosef Bacik int i, c; 22981406e432SJosef Bacik 22991406e432SJosef Bacik if (copy_from_user(&space_args, 23001406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 23011406e432SJosef Bacik sizeof(space_args))) 23021406e432SJosef Bacik return -EFAULT; 23031406e432SJosef Bacik 2304bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2305bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2306bf5fc093SJosef Bacik 2307bf5fc093SJosef Bacik info = NULL; 23087fde62bfSChris Mason rcu_read_lock(); 2309bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2310bf5fc093SJosef Bacik list) { 2311bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2312bf5fc093SJosef Bacik info = tmp; 2313bf5fc093SJosef Bacik break; 2314bf5fc093SJosef Bacik } 2315bf5fc093SJosef Bacik } 23167fde62bfSChris Mason rcu_read_unlock(); 23171406e432SJosef Bacik 2318bf5fc093SJosef Bacik if (!info) 2319bf5fc093SJosef Bacik continue; 2320bf5fc093SJosef Bacik 2321bf5fc093SJosef Bacik down_read(&info->groups_sem); 2322bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2323bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2324bf5fc093SJosef Bacik slot_count++; 2325bf5fc093SJosef Bacik } 2326bf5fc093SJosef Bacik up_read(&info->groups_sem); 2327bf5fc093SJosef Bacik } 2328bf5fc093SJosef Bacik 23297fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 23307fde62bfSChris Mason if (space_args.space_slots == 0) { 23317fde62bfSChris Mason space_args.total_spaces = slot_count; 23327fde62bfSChris Mason goto out; 23337fde62bfSChris Mason } 2334bf5fc093SJosef Bacik 233551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2336bf5fc093SJosef Bacik 23377fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2338bf5fc093SJosef Bacik 23397fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 23407fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 23417fde62bfSChris Mason */ 23427fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 23437fde62bfSChris Mason return -ENOMEM; 23447fde62bfSChris Mason 23457fde62bfSChris Mason space_args.total_spaces = 0; 23467fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 23477fde62bfSChris Mason if (!dest) 23487fde62bfSChris Mason return -ENOMEM; 23497fde62bfSChris Mason dest_orig = dest; 23507fde62bfSChris Mason 23517fde62bfSChris Mason /* now we have a buffer to copy into */ 2352bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2353bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2354bf5fc093SJosef Bacik 235551788b1bSDan Rosenberg if (!slot_count) 235651788b1bSDan Rosenberg break; 235751788b1bSDan Rosenberg 2358bf5fc093SJosef Bacik info = NULL; 23591406e432SJosef Bacik rcu_read_lock(); 2360bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2361bf5fc093SJosef Bacik list) { 2362bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2363bf5fc093SJosef Bacik info = tmp; 23647fde62bfSChris Mason break; 2365bf5fc093SJosef Bacik } 2366bf5fc093SJosef Bacik } 2367bf5fc093SJosef Bacik rcu_read_unlock(); 23687fde62bfSChris Mason 2369bf5fc093SJosef Bacik if (!info) 2370bf5fc093SJosef Bacik continue; 2371bf5fc093SJosef Bacik down_read(&info->groups_sem); 2372bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2373bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2374bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2375bf5fc093SJosef Bacik &space); 23767fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 23771406e432SJosef Bacik dest++; 23781406e432SJosef Bacik space_args.total_spaces++; 237951788b1bSDan Rosenberg slot_count--; 23801406e432SJosef Bacik } 238151788b1bSDan Rosenberg if (!slot_count) 238251788b1bSDan Rosenberg break; 2383bf5fc093SJosef Bacik } 2384bf5fc093SJosef Bacik up_read(&info->groups_sem); 2385bf5fc093SJosef Bacik } 23861406e432SJosef Bacik 23877fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 23887fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 23897fde62bfSChris Mason 23907fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 23917fde62bfSChris Mason ret = -EFAULT; 23927fde62bfSChris Mason 23937fde62bfSChris Mason kfree(dest_orig); 23947fde62bfSChris Mason out: 23957fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 23961406e432SJosef Bacik ret = -EFAULT; 23971406e432SJosef Bacik 23981406e432SJosef Bacik return ret; 23991406e432SJosef Bacik } 24001406e432SJosef Bacik 2401f46b5a66SChristoph Hellwig /* 2402f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2403f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2404f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2405f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2406f46b5a66SChristoph Hellwig */ 2407f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2408f46b5a66SChristoph Hellwig { 2409f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2410f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2411f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2412f46b5a66SChristoph Hellwig 2413f46b5a66SChristoph Hellwig trans = file->private_data; 24141ab86aedSSage Weil if (!trans) 24151ab86aedSSage Weil return -EINVAL; 2416b214107eSChristoph Hellwig file->private_data = NULL; 24179ca9ee09SSage Weil 24181ab86aedSSage Weil btrfs_end_transaction(trans, root); 24191ab86aedSSage Weil 24209ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 24219ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 24229ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 24239ca9ee09SSage Weil 2424cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 24251ab86aedSSage Weil return 0; 2426f46b5a66SChristoph Hellwig } 2427f46b5a66SChristoph Hellwig 242846204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 242946204592SSage Weil { 243046204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 243146204592SSage Weil struct btrfs_trans_handle *trans; 243246204592SSage Weil u64 transid; 2433db5b493aSTsutomu Itoh int ret; 243446204592SSage Weil 243546204592SSage Weil trans = btrfs_start_transaction(root, 0); 243698d5dc13STsutomu Itoh if (IS_ERR(trans)) 243798d5dc13STsutomu Itoh return PTR_ERR(trans); 243846204592SSage Weil transid = trans->transid; 2439db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 24408b2b2d3cSTsutomu Itoh if (ret) { 24418b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 2442db5b493aSTsutomu Itoh return ret; 24438b2b2d3cSTsutomu Itoh } 244446204592SSage Weil 244546204592SSage Weil if (argp) 244646204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 244746204592SSage Weil return -EFAULT; 244846204592SSage Weil return 0; 244946204592SSage Weil } 245046204592SSage Weil 245146204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 245246204592SSage Weil { 245346204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 245446204592SSage Weil u64 transid; 245546204592SSage Weil 245646204592SSage Weil if (argp) { 245746204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 245846204592SSage Weil return -EFAULT; 245946204592SSage Weil } else { 246046204592SSage Weil transid = 0; /* current trans */ 246146204592SSage Weil } 246246204592SSage Weil return btrfs_wait_for_commit(root, transid); 246346204592SSage Weil } 246446204592SSage Weil 2465f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2466f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2467f46b5a66SChristoph Hellwig { 2468f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 24694bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2470f46b5a66SChristoph Hellwig 2471f46b5a66SChristoph Hellwig switch (cmd) { 24726cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 24736cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 24746cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 24756cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 24766cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 24776cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2478f7039b1dSLi Dongyang case FITRIM: 2479f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 2480f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2481fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2482fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2483fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 24843de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2485fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 248676dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 248776dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 24880caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 24890caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 24900caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 24910caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 24926ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 24936ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2494f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 24951e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 24961e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 24971e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2498f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 24994bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2500f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 25014bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2502f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 25034bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2504f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2505f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2506f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2507c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2508c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 25097a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2510f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2511f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2512f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2513f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2514ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2515ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2516ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2517ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 25181406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 25191406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2520f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2521f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2522f46b5a66SChristoph Hellwig return 0; 252346204592SSage Weil case BTRFS_IOC_START_SYNC: 252446204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 252546204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 252646204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2527f46b5a66SChristoph Hellwig } 2528f46b5a66SChristoph Hellwig 2529f46b5a66SChristoph Hellwig return -ENOTTY; 2530f46b5a66SChristoph Hellwig } 2531