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> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 5963541927SFilipe David Borba Manana #include "props.h" 603b02a68aSJeff Mahoney #include "sysfs.h" 61f46b5a66SChristoph Hellwig 62416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 63416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 64416161dbSMark Fasheh 656cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 666cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 676cbff00fSChristoph Hellwig { 686cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 696cbff00fSChristoph Hellwig return flags; 706cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 716cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 726cbff00fSChristoph Hellwig else 736cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 746cbff00fSChristoph Hellwig } 75f46b5a66SChristoph Hellwig 766cbff00fSChristoph Hellwig /* 776cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 786cbff00fSChristoph Hellwig */ 796cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 806cbff00fSChristoph Hellwig { 816cbff00fSChristoph Hellwig unsigned int iflags = 0; 826cbff00fSChristoph Hellwig 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 846cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 866cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 876cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 886cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 896cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 906cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 916cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 926cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 936cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 946cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 95d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 96d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 97d0092bddSLi Zefan 98d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 99d0092bddSLi Zefan iflags |= FS_COMPR_FL; 100d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 101d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1026cbff00fSChristoph Hellwig 1036cbff00fSChristoph Hellwig return iflags; 1046cbff00fSChristoph Hellwig } 1056cbff00fSChristoph Hellwig 1066cbff00fSChristoph Hellwig /* 1076cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1086cbff00fSChristoph Hellwig */ 1096cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1106cbff00fSChristoph Hellwig { 1116cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1126cbff00fSChristoph Hellwig 1136cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1146cbff00fSChristoph Hellwig 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1176cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1186cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1196cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1206cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1216cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1226cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1236cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1246cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1256cbff00fSChristoph Hellwig } 1266cbff00fSChristoph Hellwig 1276cbff00fSChristoph Hellwig /* 1286cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1296cbff00fSChristoph Hellwig * 130e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1316cbff00fSChristoph Hellwig */ 1326cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1336cbff00fSChristoph Hellwig { 1340b4dcea5SChris Mason unsigned int flags; 1350b4dcea5SChris Mason 1360b4dcea5SChris Mason if (!dir) 1370b4dcea5SChris Mason return; 1380b4dcea5SChris Mason 1390b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1406cbff00fSChristoph Hellwig 141e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 142e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 143e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 144e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 145e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 146e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 147e27425d6SJosef Bacik } 1486cbff00fSChristoph Hellwig 149213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 150e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 151213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 152213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 153213490b3SLiu Bo } 154e27425d6SJosef Bacik 1556cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1566cbff00fSChristoph Hellwig } 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1596cbff00fSChristoph Hellwig { 160496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1616cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1646cbff00fSChristoph Hellwig return -EFAULT; 1656cbff00fSChristoph Hellwig return 0; 1666cbff00fSChristoph Hellwig } 1676cbff00fSChristoph Hellwig 16875e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16975e7cb7fSLiu Bo { 17075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 173e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 174e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17575e7cb7fSLiu Bo return -EOPNOTSUPP; 17675e7cb7fSLiu Bo 17775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17875e7cb7fSLiu Bo return -EINVAL; 17975e7cb7fSLiu Bo 18075e7cb7fSLiu Bo return 0; 18175e7cb7fSLiu Bo } 18275e7cb7fSLiu Bo 1836cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1846cbff00fSChristoph Hellwig { 185496ad9aaSAl Viro struct inode *inode = file_inode(file); 1866cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1876cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1886cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1896cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1906cbff00fSChristoph Hellwig int ret; 191f062abf0SLi Zefan u64 ip_oldflags; 192f062abf0SLi Zefan unsigned int i_oldflags; 1937e97b8daSDavid Sterba umode_t mode; 1946cbff00fSChristoph Hellwig 195b83cc969SLi Zefan if (btrfs_root_readonly(root)) 196b83cc969SLi Zefan return -EROFS; 197b83cc969SLi Zefan 1986cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1996cbff00fSChristoph Hellwig return -EFAULT; 2006cbff00fSChristoph Hellwig 20175e7cb7fSLiu Bo ret = check_flags(flags); 20275e7cb7fSLiu Bo if (ret) 20375e7cb7fSLiu Bo return ret; 2046cbff00fSChristoph Hellwig 2052e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 2066cbff00fSChristoph Hellwig return -EACCES; 2076cbff00fSChristoph Hellwig 208e7848683SJan Kara ret = mnt_want_write_file(file); 209e7848683SJan Kara if (ret) 210e7848683SJan Kara return ret; 211e7848683SJan Kara 2126cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2136cbff00fSChristoph Hellwig 214f062abf0SLi Zefan ip_oldflags = ip->flags; 215f062abf0SLi Zefan i_oldflags = inode->i_flags; 2167e97b8daSDavid Sterba mode = inode->i_mode; 217f062abf0SLi Zefan 2186cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2196cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2206cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2216cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2226cbff00fSChristoph Hellwig ret = -EPERM; 2236cbff00fSChristoph Hellwig goto out_unlock; 2246cbff00fSChristoph Hellwig } 2256cbff00fSChristoph Hellwig } 2266cbff00fSChristoph Hellwig 2276cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2286cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2296cbff00fSChristoph Hellwig else 2306cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2316cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2326cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2336cbff00fSChristoph Hellwig else 2346cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2356cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2366cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2376cbff00fSChristoph Hellwig else 2386cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2396cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2406cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2416cbff00fSChristoph Hellwig else 2426cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2436cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2446cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2456cbff00fSChristoph Hellwig else 2466cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2476cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2486cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2496cbff00fSChristoph Hellwig else 2506cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2517e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2527e97b8daSDavid Sterba if (S_ISREG(mode)) { 2537e97b8daSDavid Sterba /* 2547e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2557e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2567e97b8daSDavid Sterba * status of the file and will not set it. 2577e97b8daSDavid Sterba */ 2587e97b8daSDavid Sterba if (inode->i_size == 0) 2597e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2607e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2617e97b8daSDavid Sterba } else { 262e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2637e97b8daSDavid Sterba } 2647e97b8daSDavid Sterba } else { 2657e97b8daSDavid Sterba /* 2667e97b8daSDavid Sterba * Revert back under same assuptions as above 2677e97b8daSDavid Sterba */ 2687e97b8daSDavid Sterba if (S_ISREG(mode)) { 2697e97b8daSDavid Sterba if (inode->i_size == 0) 2707e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2717e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2727e97b8daSDavid Sterba } else { 273e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2747e97b8daSDavid Sterba } 2757e97b8daSDavid Sterba } 2766cbff00fSChristoph Hellwig 27775e7cb7fSLiu Bo /* 27875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 28075e7cb7fSLiu Bo * things smaller. 28175e7cb7fSLiu Bo */ 28275e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 28375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 28475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 28563541927SFilipe David Borba Manana 28663541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 28763541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 28863541927SFilipe David Borba Manana goto out_drop; 28975e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 29063541927SFilipe David Borba Manana const char *comp; 29163541927SFilipe David Borba Manana 29275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 29375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 29463541927SFilipe David Borba Manana 29563541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 29663541927SFilipe David Borba Manana comp = "lzo"; 29763541927SFilipe David Borba Manana else 29863541927SFilipe David Borba Manana comp = "zlib"; 29963541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 30063541927SFilipe David Borba Manana comp, strlen(comp), 0); 30163541927SFilipe David Borba Manana if (ret) 30263541927SFilipe David Borba Manana goto out_drop; 30363541927SFilipe David Borba Manana 304ebcb904dSLi Zefan } else { 305ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 30675e7cb7fSLiu Bo } 3076cbff00fSChristoph Hellwig 3084da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 309f062abf0SLi Zefan if (IS_ERR(trans)) { 310f062abf0SLi Zefan ret = PTR_ERR(trans); 311f062abf0SLi Zefan goto out_drop; 312f062abf0SLi Zefan } 3136cbff00fSChristoph Hellwig 314306424ccSLi Zefan btrfs_update_iflags(inode); 3150c4d2d95SJosef Bacik inode_inc_iversion(inode); 316306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3176cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3186cbff00fSChristoph Hellwig 3196cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 320f062abf0SLi Zefan out_drop: 321f062abf0SLi Zefan if (ret) { 322f062abf0SLi Zefan ip->flags = ip_oldflags; 323f062abf0SLi Zefan inode->i_flags = i_oldflags; 324f062abf0SLi Zefan } 3256cbff00fSChristoph Hellwig 3266cbff00fSChristoph Hellwig out_unlock: 3276cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 328e7848683SJan Kara mnt_drop_write_file(file); 3292d4e6f6aSliubo return ret; 3306cbff00fSChristoph Hellwig } 3316cbff00fSChristoph Hellwig 3326cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3336cbff00fSChristoph Hellwig { 334496ad9aaSAl Viro struct inode *inode = file_inode(file); 3356cbff00fSChristoph Hellwig 3366cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3376cbff00fSChristoph Hellwig } 338f46b5a66SChristoph Hellwig 339f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 340f7039b1dSLi Dongyang { 34154563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 342f7039b1dSLi Dongyang struct btrfs_device *device; 343f7039b1dSLi Dongyang struct request_queue *q; 344f7039b1dSLi Dongyang struct fstrim_range range; 345f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 346f7039b1dSLi Dongyang u64 num_devices = 0; 347815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 348f7039b1dSLi Dongyang int ret; 349f7039b1dSLi Dongyang 350f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 351f7039b1dSLi Dongyang return -EPERM; 352f7039b1dSLi Dongyang 3531f78160cSXiao Guangrong rcu_read_lock(); 3541f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3551f78160cSXiao Guangrong dev_list) { 356f7039b1dSLi Dongyang if (!device->bdev) 357f7039b1dSLi Dongyang continue; 358f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 359f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 360f7039b1dSLi Dongyang num_devices++; 361f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 362f7039b1dSLi Dongyang minlen); 363f7039b1dSLi Dongyang } 364f7039b1dSLi Dongyang } 3651f78160cSXiao Guangrong rcu_read_unlock(); 366f4c697e6SLukas Czerner 367f7039b1dSLi Dongyang if (!num_devices) 368f7039b1dSLi Dongyang return -EOPNOTSUPP; 369f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 370f7039b1dSLi Dongyang return -EFAULT; 371e515c18bSLukas Czerner if (range.start > total_bytes || 372e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 373f4c697e6SLukas Czerner return -EINVAL; 374f7039b1dSLi Dongyang 375f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 376f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 377815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 378f7039b1dSLi Dongyang if (ret < 0) 379f7039b1dSLi Dongyang return ret; 380f7039b1dSLi Dongyang 381f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 382f7039b1dSLi Dongyang return -EFAULT; 383f7039b1dSLi Dongyang 384f7039b1dSLi Dongyang return 0; 385f7039b1dSLi Dongyang } 386f7039b1dSLi Dongyang 387dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 388dd5f9615SStefan Behrens { 38946e0f66aSChris Mason int i; 39046e0f66aSChris Mason 39146e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 39246e0f66aSChris Mason if (uuid[i]) 39346e0f66aSChris Mason return 0; 39446e0f66aSChris Mason } 39546e0f66aSChris Mason return 1; 396dd5f9615SStefan Behrens } 397dd5f9615SStefan Behrens 398d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 399cb8e7090SChristoph Hellwig struct dentry *dentry, 40072fd032eSSage Weil char *name, int namelen, 4016f72c7e2SArne Jansen u64 *async_transid, 4028696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 403f46b5a66SChristoph Hellwig { 404f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 405f46b5a66SChristoph Hellwig struct btrfs_key key; 406f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 407f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 408f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 409d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 41076dda93cSYan, Zheng struct btrfs_root *new_root; 411d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4128ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4135662344bSTsutomu Itoh struct inode *inode; 414f46b5a66SChristoph Hellwig int ret; 415f46b5a66SChristoph Hellwig int err; 416f46b5a66SChristoph Hellwig u64 objectid; 417f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4183de4586cSChris Mason u64 index = 0; 419d5c12070SMiao Xie u64 qgroup_reserved; 4208ea05e3aSAlexander Block uuid_le new_uuid; 421f46b5a66SChristoph Hellwig 422581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4232fbe8c8aSAl Viro if (ret) 424a22285a6SYan, Zheng return ret; 4256a912213SJosef Bacik 426d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4279ed74f2dSJosef Bacik /* 428d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 429d5c12070SMiao Xie * of create_snapshot(). 4309ed74f2dSJosef Bacik */ 431d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 432dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 433d5c12070SMiao Xie if (ret) 434d5c12070SMiao Xie return ret; 435f46b5a66SChristoph Hellwig 436d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 437d5c12070SMiao Xie if (IS_ERR(trans)) { 438d5c12070SMiao Xie ret = PTR_ERR(trans); 439d5c12070SMiao Xie goto out; 440d5c12070SMiao Xie } 441d5c12070SMiao Xie trans->block_rsv = &block_rsv; 442d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 443f46b5a66SChristoph Hellwig 4448696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4456f72c7e2SArne Jansen if (ret) 4466f72c7e2SArne Jansen goto fail; 4476f72c7e2SArne Jansen 4485d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4495581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4508e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4518e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4528e8a1e31SJosef Bacik goto fail; 4538e8a1e31SJosef Bacik } 454f46b5a66SChristoph Hellwig 4555d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 456f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 457f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4585d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 459f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 460f46b5a66SChristoph Hellwig 4610a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 462f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4635d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 464b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4655d4f98a2SYan Zheng BTRFS_UUID_SIZE); 466f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 467f46b5a66SChristoph Hellwig 4688ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4698ea05e3aSAlexander Block 470f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4713cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 4723cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 4733cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 4743cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 4753cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 476f46b5a66SChristoph Hellwig 4773cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 4783cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 4793cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 48008fe4db1SLi Zefan 481f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 48284234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 483f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 484f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 48586b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 48680ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 487f46b5a66SChristoph Hellwig 4888ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4898ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4908ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4918ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4923cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 4933cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 4948ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4958ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4968ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 497f46b5a66SChristoph Hellwig 498925baeddSChris Mason btrfs_tree_unlock(leaf); 499f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 500f46b5a66SChristoph Hellwig leaf = NULL; 501f46b5a66SChristoph Hellwig 502f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 503f46b5a66SChristoph Hellwig 504f46b5a66SChristoph Hellwig key.objectid = objectid; 5055d4f98a2SYan Zheng key.offset = 0; 506f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 507f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 508f46b5a66SChristoph Hellwig &root_item); 509f46b5a66SChristoph Hellwig if (ret) 510f46b5a66SChristoph Hellwig goto fail; 511f46b5a66SChristoph Hellwig 51276dda93cSYan, Zheng key.offset = (u64)-1; 51376dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 51479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 51579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 51679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 51779787eaaSJeff Mahoney goto fail; 51879787eaaSJeff Mahoney } 51976dda93cSYan, Zheng 52076dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 52176dda93cSYan, Zheng 52263541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 523ce598979SMark Fasheh if (ret) { 524ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 52579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 526ce598979SMark Fasheh goto fail; 527ce598979SMark Fasheh } 528ce598979SMark Fasheh 529f46b5a66SChristoph Hellwig /* 530f46b5a66SChristoph Hellwig * insert the directory item 531f46b5a66SChristoph Hellwig */ 5323de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 53379787eaaSJeff Mahoney if (ret) { 53479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 53579787eaaSJeff Mahoney goto fail; 53679787eaaSJeff Mahoney } 5373de4586cSChris Mason 5383de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 53916cdcec7SMiao Xie name, namelen, dir, &key, 5403de4586cSChris Mason BTRFS_FT_DIR, index); 54179787eaaSJeff Mahoney if (ret) { 54279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 543f46b5a66SChristoph Hellwig goto fail; 54479787eaaSJeff Mahoney } 5450660b5afSChris Mason 54652c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 54752c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 54852c26179SYan Zheng BUG_ON(ret); 54952c26179SYan Zheng 5500660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5514df27c4dSYan, Zheng objectid, root->root_key.objectid, 55233345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5530660b5afSChris Mason BUG_ON(ret); 5540660b5afSChris Mason 555dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 556dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 557dd5f9615SStefan Behrens objectid); 558dd5f9615SStefan Behrens if (ret) 559dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 560dd5f9615SStefan Behrens 561f46b5a66SChristoph Hellwig fail: 562d5c12070SMiao Xie trans->block_rsv = NULL; 563d5c12070SMiao Xie trans->bytes_reserved = 0; 56472fd032eSSage Weil if (async_transid) { 56572fd032eSSage Weil *async_transid = trans->transid; 56672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 56700d71c9cSMiao Xie if (err) 56800d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 56972fd032eSSage Weil } else { 57076dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 57172fd032eSSage Weil } 572f46b5a66SChristoph Hellwig if (err && !ret) 573f46b5a66SChristoph Hellwig ret = err; 5741a65e24bSChris Mason 5755662344bSTsutomu Itoh if (!ret) { 5765662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 5775662344bSTsutomu Itoh if (IS_ERR(inode)) { 5785662344bSTsutomu Itoh ret = PTR_ERR(inode); 5795662344bSTsutomu Itoh goto out; 5805662344bSTsutomu Itoh } 5815662344bSTsutomu Itoh d_instantiate(dentry, inode); 5825662344bSTsutomu Itoh } 583d5c12070SMiao Xie out: 584d5c12070SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 585f46b5a66SChristoph Hellwig return ret; 586f46b5a66SChristoph Hellwig } 587f46b5a66SChristoph Hellwig 588e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 589e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 590e9662f70SMiao Xie u64 *async_transid, bool readonly, 591e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 592f46b5a66SChristoph Hellwig { 5932e4bfab9SYan, Zheng struct inode *inode; 594f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 595f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5962e4bfab9SYan, Zheng int ret; 597f46b5a66SChristoph Hellwig 598f46b5a66SChristoph Hellwig if (!root->ref_cows) 599f46b5a66SChristoph Hellwig return -EINVAL; 600f46b5a66SChristoph Hellwig 6016a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6026a03843dSMiao Xie if (ret) 6036a03843dSMiao Xie return ret; 6046a03843dSMiao Xie 605b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6066a03843dSMiao Xie 607a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 608a22285a6SYan, Zheng if (!pending_snapshot) 609a22285a6SYan, Zheng return -ENOMEM; 610a22285a6SYan, Zheng 61166d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 61266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 613d5c12070SMiao Xie /* 614d5c12070SMiao Xie * 1 - parent dir inode 615d5c12070SMiao Xie * 2 - dir entries 616d5c12070SMiao Xie * 1 - root item 617d5c12070SMiao Xie * 2 - root ref/backref 618d5c12070SMiao Xie * 1 - root of snapshot 619dd5f9615SStefan Behrens * 1 - UUID item 620d5c12070SMiao Xie */ 621d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 622dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 623ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 624ee3441b4SJeff Mahoney false); 625d5c12070SMiao Xie if (ret) 626d5c12070SMiao Xie goto out; 627d5c12070SMiao Xie 628a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 629a22285a6SYan, Zheng pending_snapshot->root = root; 630b83cc969SLi Zefan pending_snapshot->readonly = readonly; 631e9662f70SMiao Xie pending_snapshot->dir = dir; 6328696c533SMiao Xie pending_snapshot->inherit = inherit; 633a22285a6SYan, Zheng 634d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 635a22285a6SYan, Zheng if (IS_ERR(trans)) { 636a22285a6SYan, Zheng ret = PTR_ERR(trans); 637a22285a6SYan, Zheng goto fail; 638a22285a6SYan, Zheng } 639a22285a6SYan, Zheng 6408351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 641a22285a6SYan, Zheng list_add(&pending_snapshot->list, 642a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6438351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 64472fd032eSSage Weil if (async_transid) { 64572fd032eSSage Weil *async_transid = trans->transid; 64672fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 64772fd032eSSage Weil root->fs_info->extent_root, 1); 64800d71c9cSMiao Xie if (ret) 64900d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 65072fd032eSSage Weil } else { 65172fd032eSSage Weil ret = btrfs_commit_transaction(trans, 65272fd032eSSage Weil root->fs_info->extent_root); 65372fd032eSSage Weil } 654aec8030aSMiao Xie if (ret) 655c37b2b62SJosef Bacik goto fail; 656a22285a6SYan, Zheng 657a22285a6SYan, Zheng ret = pending_snapshot->error; 658f46b5a66SChristoph Hellwig if (ret) 6592e4bfab9SYan, Zheng goto fail; 660f46b5a66SChristoph Hellwig 66166b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 66266b4ffd1SJosef Bacik if (ret) 66366b4ffd1SJosef Bacik goto fail; 664f46b5a66SChristoph Hellwig 6652fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6662e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6672e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6682e4bfab9SYan, Zheng goto fail; 6692e4bfab9SYan, Zheng } 6705662344bSTsutomu Itoh 6712e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6722e4bfab9SYan, Zheng ret = 0; 6732e4bfab9SYan, Zheng fail: 674d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 675d5c12070SMiao Xie &pending_snapshot->block_rsv, 676d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 677d5c12070SMiao Xie out: 678a22285a6SYan, Zheng kfree(pending_snapshot); 679f46b5a66SChristoph Hellwig return ret; 680f46b5a66SChristoph Hellwig } 681f46b5a66SChristoph Hellwig 6824260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 6834260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 6844260f7c7SSage Weil * minimal. 6854260f7c7SSage Weil */ 6864260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6874260f7c7SSage Weil { 6882f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6894260f7c7SSage Weil 6904260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6914260f7c7SSage Weil return 0; 6922f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6934260f7c7SSage Weil return 0; 6942f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6954260f7c7SSage Weil return 0; 6964260f7c7SSage Weil return !capable(CAP_FOWNER); 6974260f7c7SSage Weil } 6984260f7c7SSage Weil 6994260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7004260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7014260f7c7SSage Weil * whether the type of victim is right. 7024260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7034260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7044260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7054260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7064260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7074260f7c7SSage Weil * a. be owner of dir, or 7084260f7c7SSage Weil * b. be owner of victim, or 7094260f7c7SSage Weil * c. have CAP_FOWNER capability 7104260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7114260f7c7SSage Weil * links pointing to it. 7124260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7134260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7144260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7154260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7164260f7c7SSage Weil * nfs_async_unlink(). 7174260f7c7SSage Weil */ 7184260f7c7SSage Weil 7194260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7204260f7c7SSage Weil { 7214260f7c7SSage Weil int error; 7224260f7c7SSage Weil 7234260f7c7SSage Weil if (!victim->d_inode) 7244260f7c7SSage Weil return -ENOENT; 7254260f7c7SSage Weil 7264260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7274fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7284260f7c7SSage Weil 7294260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7304260f7c7SSage Weil if (error) 7314260f7c7SSage Weil return error; 7324260f7c7SSage Weil if (IS_APPEND(dir)) 7334260f7c7SSage Weil return -EPERM; 7344260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7354260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7364260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7374260f7c7SSage Weil return -EPERM; 7384260f7c7SSage Weil if (isdir) { 7394260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7404260f7c7SSage Weil return -ENOTDIR; 7414260f7c7SSage Weil if (IS_ROOT(victim)) 7424260f7c7SSage Weil return -EBUSY; 7434260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7444260f7c7SSage Weil return -EISDIR; 7454260f7c7SSage Weil if (IS_DEADDIR(dir)) 7464260f7c7SSage Weil return -ENOENT; 7474260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7484260f7c7SSage Weil return -EBUSY; 7494260f7c7SSage Weil return 0; 7504260f7c7SSage Weil } 7514260f7c7SSage Weil 752cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 753cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 754cb8e7090SChristoph Hellwig { 755cb8e7090SChristoph Hellwig if (child->d_inode) 756cb8e7090SChristoph Hellwig return -EEXIST; 757cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 758cb8e7090SChristoph Hellwig return -ENOENT; 759cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 760cb8e7090SChristoph Hellwig } 761cb8e7090SChristoph Hellwig 762cb8e7090SChristoph Hellwig /* 763cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 764cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 765cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 766cb8e7090SChristoph Hellwig */ 76776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 76876dda93cSYan, Zheng char *name, int namelen, 76972fd032eSSage Weil struct btrfs_root *snap_src, 7706f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7718696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 772cb8e7090SChristoph Hellwig { 77376dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 774cb8e7090SChristoph Hellwig struct dentry *dentry; 775cb8e7090SChristoph Hellwig int error; 776cb8e7090SChristoph Hellwig 7775c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 7785c50c9b8SDavid Sterba if (error == -EINTR) 7795c50c9b8SDavid Sterba return error; 780cb8e7090SChristoph Hellwig 781cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 782cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 783cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 784cb8e7090SChristoph Hellwig goto out_unlock; 785cb8e7090SChristoph Hellwig 786cb8e7090SChristoph Hellwig error = -EEXIST; 787cb8e7090SChristoph Hellwig if (dentry->d_inode) 788cb8e7090SChristoph Hellwig goto out_dput; 789cb8e7090SChristoph Hellwig 79076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 791cb8e7090SChristoph Hellwig if (error) 792a874a63eSLiu Bo goto out_dput; 793cb8e7090SChristoph Hellwig 7949c52057cSChris Mason /* 7959c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 7969c52057cSChris Mason * check for them now when we can safely fail 7979c52057cSChris Mason */ 7989c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 7999c52057cSChris Mason dir->i_ino, name, 8009c52057cSChris Mason namelen); 8019c52057cSChris Mason if (error) 8029c52057cSChris Mason goto out_dput; 8039c52057cSChris Mason 80476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 80576dda93cSYan, Zheng 80676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 80776dda93cSYan, Zheng goto out_up_read; 80876dda93cSYan, Zheng 8093de4586cSChris Mason if (snap_src) { 810e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8116f72c7e2SArne Jansen async_transid, readonly, inherit); 8123de4586cSChris Mason } else { 813d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 814d5c12070SMiao Xie async_transid, inherit); 8153de4586cSChris Mason } 81676dda93cSYan, Zheng if (!error) 81776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 81876dda93cSYan, Zheng out_up_read: 81976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 820cb8e7090SChristoph Hellwig out_dput: 821cb8e7090SChristoph Hellwig dput(dentry); 822cb8e7090SChristoph Hellwig out_unlock: 82376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 824cb8e7090SChristoph Hellwig return error; 825cb8e7090SChristoph Hellwig } 826cb8e7090SChristoph Hellwig 8274cb5300bSChris Mason /* 8284cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8294cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8304cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8314cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8324cb5300bSChris Mason * part of the file 8334cb5300bSChris Mason */ 8344cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8354cb5300bSChris Mason { 8364cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8374cb5300bSChris Mason struct extent_map *em = NULL; 8384cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8394cb5300bSChris Mason u64 end; 8404cb5300bSChris Mason 8414cb5300bSChris Mason read_lock(&em_tree->lock); 8424cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8434cb5300bSChris Mason read_unlock(&em_tree->lock); 8444cb5300bSChris Mason 8454cb5300bSChris Mason if (em) { 8464cb5300bSChris Mason end = extent_map_end(em); 8474cb5300bSChris Mason free_extent_map(em); 8484cb5300bSChris Mason if (end - offset > thresh) 8494cb5300bSChris Mason return 0; 8504cb5300bSChris Mason } 8514cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8524cb5300bSChris Mason thresh /= 2; 8534cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8544cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8554cb5300bSChris Mason if (end >= thresh) 8564cb5300bSChris Mason return 0; 8574cb5300bSChris Mason return 1; 8584cb5300bSChris Mason } 8594cb5300bSChris Mason 8604cb5300bSChris Mason /* 8614cb5300bSChris Mason * helper function to walk through a file and find extents 8624cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8634cb5300bSChris Mason * 8644cb5300bSChris Mason * This is used by the defragging code to find new and small 8654cb5300bSChris Mason * extents 8664cb5300bSChris Mason */ 8674cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8684cb5300bSChris Mason struct inode *inode, u64 newer_than, 8694cb5300bSChris Mason u64 *off, int thresh) 8704cb5300bSChris Mason { 8714cb5300bSChris Mason struct btrfs_path *path; 8724cb5300bSChris Mason struct btrfs_key min_key; 8734cb5300bSChris Mason struct extent_buffer *leaf; 8744cb5300bSChris Mason struct btrfs_file_extent_item *extent; 8754cb5300bSChris Mason int type; 8764cb5300bSChris Mason int ret; 877a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 8784cb5300bSChris Mason 8794cb5300bSChris Mason path = btrfs_alloc_path(); 8804cb5300bSChris Mason if (!path) 8814cb5300bSChris Mason return -ENOMEM; 8824cb5300bSChris Mason 883a4689d2bSDavid Sterba min_key.objectid = ino; 8844cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 8854cb5300bSChris Mason min_key.offset = *off; 8864cb5300bSChris Mason 8874cb5300bSChris Mason path->keep_locks = 1; 8884cb5300bSChris Mason 8894cb5300bSChris Mason while (1) { 8906174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 8914cb5300bSChris Mason if (ret != 0) 8924cb5300bSChris Mason goto none; 893a4689d2bSDavid Sterba if (min_key.objectid != ino) 8944cb5300bSChris Mason goto none; 8954cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8964cb5300bSChris Mason goto none; 8974cb5300bSChris Mason 8984cb5300bSChris Mason leaf = path->nodes[0]; 8994cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9004cb5300bSChris Mason struct btrfs_file_extent_item); 9014cb5300bSChris Mason 9024cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9034cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9044cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9054cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9064cb5300bSChris Mason *off = min_key.offset; 9074cb5300bSChris Mason btrfs_free_path(path); 9084cb5300bSChris Mason return 0; 9094cb5300bSChris Mason } 9104cb5300bSChris Mason 9114cb5300bSChris Mason if (min_key.offset == (u64)-1) 9124cb5300bSChris Mason goto none; 9134cb5300bSChris Mason 9144cb5300bSChris Mason min_key.offset++; 9154cb5300bSChris Mason btrfs_release_path(path); 9164cb5300bSChris Mason } 9174cb5300bSChris Mason none: 9184cb5300bSChris Mason btrfs_free_path(path); 9194cb5300bSChris Mason return -ENOENT; 9204cb5300bSChris Mason } 9214cb5300bSChris Mason 9226c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 92317ce6ef8SLiu Bo { 92417ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 925940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9266c282eb4SLi Zefan struct extent_map *em; 9276c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 928940100a4SChris Mason 929940100a4SChris Mason /* 930940100a4SChris Mason * hopefully we have this extent in the tree already, try without 931940100a4SChris Mason * the full extent lock 932940100a4SChris Mason */ 933940100a4SChris Mason read_lock(&em_tree->lock); 934940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 935940100a4SChris Mason read_unlock(&em_tree->lock); 936940100a4SChris Mason 937940100a4SChris Mason if (!em) { 938940100a4SChris Mason /* get the big lock and read metadata off disk */ 939d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 940940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 941d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 942940100a4SChris Mason 9436cf8bfbfSDan Carpenter if (IS_ERR(em)) 9446c282eb4SLi Zefan return NULL; 945940100a4SChris Mason } 946940100a4SChris Mason 9476c282eb4SLi Zefan return em; 9486c282eb4SLi Zefan } 9496c282eb4SLi Zefan 9506c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9516c282eb4SLi Zefan { 9526c282eb4SLi Zefan struct extent_map *next; 9536c282eb4SLi Zefan bool ret = true; 9546c282eb4SLi Zefan 9556c282eb4SLi Zefan /* this is the last extent */ 9566c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9576c282eb4SLi Zefan return false; 9586c282eb4SLi Zefan 9596c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9606c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9616c282eb4SLi Zefan ret = false; 9626c282eb4SLi Zefan 9636c282eb4SLi Zefan free_extent_map(next); 9646c282eb4SLi Zefan return ret; 9656c282eb4SLi Zefan } 9666c282eb4SLi Zefan 9676c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 968a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 969a43a2111SAndrew Mahone int compress) 9706c282eb4SLi Zefan { 9716c282eb4SLi Zefan struct extent_map *em; 9726c282eb4SLi Zefan int ret = 1; 9736c282eb4SLi Zefan bool next_mergeable = true; 9746c282eb4SLi Zefan 9756c282eb4SLi Zefan /* 9766c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 9776c282eb4SLi Zefan * defragging it 9786c282eb4SLi Zefan */ 9796c282eb4SLi Zefan if (start < *defrag_end) 9806c282eb4SLi Zefan return 1; 9816c282eb4SLi Zefan 9826c282eb4SLi Zefan *skip = 0; 9836c282eb4SLi Zefan 9846c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 9856c282eb4SLi Zefan if (!em) 9866c282eb4SLi Zefan return 0; 9876c282eb4SLi Zefan 988940100a4SChris Mason /* this will cover holes, and inline extents */ 98917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 990940100a4SChris Mason ret = 0; 99117ce6ef8SLiu Bo goto out; 99217ce6ef8SLiu Bo } 99317ce6ef8SLiu Bo 9946c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 995940100a4SChris Mason 996940100a4SChris Mason /* 9976c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9986c282eb4SLi Zefan * real extent, don't bother defragging it 999940100a4SChris Mason */ 1000a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10016c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1002940100a4SChris Mason ret = 0; 100317ce6ef8SLiu Bo out: 1004940100a4SChris Mason /* 1005940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1006940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1007940100a4SChris Mason * so that the next tiny extent will force a defrag. 1008940100a4SChris Mason * 1009940100a4SChris Mason * The end result of this is that tiny extents before a single big 1010940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1011940100a4SChris Mason */ 1012940100a4SChris Mason if (ret) { 1013940100a4SChris Mason *defrag_end = extent_map_end(em); 1014940100a4SChris Mason } else { 1015940100a4SChris Mason *last_len = 0; 1016940100a4SChris Mason *skip = extent_map_end(em); 1017940100a4SChris Mason *defrag_end = 0; 1018940100a4SChris Mason } 1019940100a4SChris Mason 1020940100a4SChris Mason free_extent_map(em); 1021940100a4SChris Mason return ret; 1022940100a4SChris Mason } 1023940100a4SChris Mason 10244cb5300bSChris Mason /* 10254cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10264cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10274cb5300bSChris Mason * to COW and defrag. 10284cb5300bSChris Mason * 10294cb5300bSChris Mason * It also makes sure the delalloc code has enough 10304cb5300bSChris Mason * dirty data to avoid making new small extents as part 10314cb5300bSChris Mason * of the defrag 10324cb5300bSChris Mason * 10334cb5300bSChris Mason * It's a good idea to start RA on this range 10344cb5300bSChris Mason * before calling this. 10354cb5300bSChris Mason */ 10364cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10374cb5300bSChris Mason struct page **pages, 10384cb5300bSChris Mason unsigned long start_index, 10394cb5300bSChris Mason int num_pages) 1040f46b5a66SChristoph Hellwig { 10414cb5300bSChris Mason unsigned long file_end; 10424cb5300bSChris Mason u64 isize = i_size_read(inode); 1043f46b5a66SChristoph Hellwig u64 page_start; 1044f46b5a66SChristoph Hellwig u64 page_end; 10451f12bd06SLiu Bo u64 page_cnt; 10464cb5300bSChris Mason int ret; 10474cb5300bSChris Mason int i; 10484cb5300bSChris Mason int i_done; 10494cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10504cb5300bSChris Mason struct extent_state *cached_state = NULL; 1051600a45e1SMiao Xie struct extent_io_tree *tree; 10523b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10534cb5300bSChris Mason 10544cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10551f12bd06SLiu Bo if (!isize || start_index > file_end) 10561f12bd06SLiu Bo return 0; 10571f12bd06SLiu Bo 10581f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10594cb5300bSChris Mason 10604cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10611f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10624cb5300bSChris Mason if (ret) 10634cb5300bSChris Mason return ret; 10644cb5300bSChris Mason i_done = 0; 1065600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10664cb5300bSChris Mason 10674cb5300bSChris Mason /* step one, lock all the pages */ 10681f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10694cb5300bSChris Mason struct page *page; 1070600a45e1SMiao Xie again: 1071a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10723b16a4e3SJosef Bacik start_index + i, mask); 10734cb5300bSChris Mason if (!page) 10744cb5300bSChris Mason break; 10754cb5300bSChris Mason 1076600a45e1SMiao Xie page_start = page_offset(page); 1077600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1078600a45e1SMiao Xie while (1) { 1079d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1080600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1081600a45e1SMiao Xie page_start); 1082d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1083600a45e1SMiao Xie if (!ordered) 1084600a45e1SMiao Xie break; 1085600a45e1SMiao Xie 1086600a45e1SMiao Xie unlock_page(page); 1087600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1088600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1089600a45e1SMiao Xie lock_page(page); 10901f12bd06SLiu Bo /* 10911f12bd06SLiu Bo * we unlocked the page above, so we need check if 10921f12bd06SLiu Bo * it was released or not. 10931f12bd06SLiu Bo */ 10941f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10951f12bd06SLiu Bo unlock_page(page); 10961f12bd06SLiu Bo page_cache_release(page); 10971f12bd06SLiu Bo goto again; 10981f12bd06SLiu Bo } 1099600a45e1SMiao Xie } 1100600a45e1SMiao Xie 11014cb5300bSChris Mason if (!PageUptodate(page)) { 11024cb5300bSChris Mason btrfs_readpage(NULL, page); 11034cb5300bSChris Mason lock_page(page); 11044cb5300bSChris Mason if (!PageUptodate(page)) { 11054cb5300bSChris Mason unlock_page(page); 11064cb5300bSChris Mason page_cache_release(page); 11074cb5300bSChris Mason ret = -EIO; 11084cb5300bSChris Mason break; 11094cb5300bSChris Mason } 11104cb5300bSChris Mason } 1111600a45e1SMiao Xie 1112600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1113600a45e1SMiao Xie unlock_page(page); 1114600a45e1SMiao Xie page_cache_release(page); 1115600a45e1SMiao Xie goto again; 1116600a45e1SMiao Xie } 1117600a45e1SMiao Xie 11184cb5300bSChris Mason pages[i] = page; 11194cb5300bSChris Mason i_done++; 11204cb5300bSChris Mason } 11214cb5300bSChris Mason if (!i_done || ret) 11224cb5300bSChris Mason goto out; 11234cb5300bSChris Mason 11244cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11254cb5300bSChris Mason goto out; 11264cb5300bSChris Mason 11274cb5300bSChris Mason /* 11284cb5300bSChris Mason * so now we have a nice long stream of locked 11294cb5300bSChris Mason * and up to date pages, lets wait on them 11304cb5300bSChris Mason */ 11314cb5300bSChris Mason for (i = 0; i < i_done; i++) 11324cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11334cb5300bSChris Mason 11344cb5300bSChris Mason page_start = page_offset(pages[0]); 11354cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11364cb5300bSChris Mason 11374cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1138d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11394cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11404cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11419e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11429e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11434cb5300bSChris Mason 11441f12bd06SLiu Bo if (i_done != page_cnt) { 11459e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11469e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11479e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11484cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11491f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11504cb5300bSChris Mason } 11514cb5300bSChris Mason 11524cb5300bSChris Mason 11539e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11549e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11554cb5300bSChris Mason 11564cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11574cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11584cb5300bSChris Mason GFP_NOFS); 11594cb5300bSChris Mason 11604cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11614cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11624cb5300bSChris Mason ClearPageChecked(pages[i]); 11634cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11644cb5300bSChris Mason set_page_dirty(pages[i]); 11654cb5300bSChris Mason unlock_page(pages[i]); 11664cb5300bSChris Mason page_cache_release(pages[i]); 11674cb5300bSChris Mason } 11684cb5300bSChris Mason return i_done; 11694cb5300bSChris Mason out: 11704cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11714cb5300bSChris Mason unlock_page(pages[i]); 11724cb5300bSChris Mason page_cache_release(pages[i]); 11734cb5300bSChris Mason } 11741f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 11754cb5300bSChris Mason return ret; 11764cb5300bSChris Mason 11774cb5300bSChris Mason } 11784cb5300bSChris Mason 11794cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 11804cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 11814cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 11824cb5300bSChris Mason { 11834cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 11844cb5300bSChris Mason struct file_ra_state *ra = NULL; 11854cb5300bSChris Mason unsigned long last_index; 1186151a31b2SLi Zefan u64 isize = i_size_read(inode); 1187940100a4SChris Mason u64 last_len = 0; 1188940100a4SChris Mason u64 skip = 0; 1189940100a4SChris Mason u64 defrag_end = 0; 11904cb5300bSChris Mason u64 newer_off = range->start; 1191f46b5a66SChristoph Hellwig unsigned long i; 1192008873eaSLi Zefan unsigned long ra_index = 0; 1193f46b5a66SChristoph Hellwig int ret; 11944cb5300bSChris Mason int defrag_count = 0; 11951a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11964cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1197008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1198008873eaSLi Zefan int cluster = max_cluster; 11994cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12004cb5300bSChris Mason struct page **pages = NULL; 12014cb5300bSChris Mason 12020abd5b17SLiu Bo if (isize == 0) 12030abd5b17SLiu Bo return 0; 12040abd5b17SLiu Bo 12050abd5b17SLiu Bo if (range->start >= isize) 12060abd5b17SLiu Bo return -EINVAL; 12071a419d85SLi Zefan 12081a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12091a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12101a419d85SLi Zefan return -EINVAL; 12111a419d85SLi Zefan if (range->compress_type) 12121a419d85SLi Zefan compress_type = range->compress_type; 12131a419d85SLi Zefan } 1214f46b5a66SChristoph Hellwig 12150abd5b17SLiu Bo if (extent_thresh == 0) 12160abd5b17SLiu Bo extent_thresh = 256 * 1024; 1217f46b5a66SChristoph Hellwig 12184cb5300bSChris Mason /* 12194cb5300bSChris Mason * if we were not given a file, allocate a readahead 12204cb5300bSChris Mason * context 12214cb5300bSChris Mason */ 12224cb5300bSChris Mason if (!file) { 12234cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12244cb5300bSChris Mason if (!ra) 12254cb5300bSChris Mason return -ENOMEM; 12264cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12274cb5300bSChris Mason } else { 12284cb5300bSChris Mason ra = &file->f_ra; 12294cb5300bSChris Mason } 12304cb5300bSChris Mason 1231d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12324cb5300bSChris Mason GFP_NOFS); 12334cb5300bSChris Mason if (!pages) { 12344cb5300bSChris Mason ret = -ENOMEM; 12354cb5300bSChris Mason goto out_ra; 12364cb5300bSChris Mason } 12374cb5300bSChris Mason 12384cb5300bSChris Mason /* find the last page to defrag */ 12391e701a32SChris Mason if (range->start + range->len > range->start) { 1240151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12411e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12421e701a32SChris Mason } else { 1243151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12441e701a32SChris Mason } 12451e701a32SChris Mason 12464cb5300bSChris Mason if (newer_than) { 12474cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12484cb5300bSChris Mason &newer_off, 64 * 1024); 12494cb5300bSChris Mason if (!ret) { 12504cb5300bSChris Mason range->start = newer_off; 12514cb5300bSChris Mason /* 12524cb5300bSChris Mason * we always align our defrag to help keep 12534cb5300bSChris Mason * the extents in the file evenly spaced 12544cb5300bSChris Mason */ 12554cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12564cb5300bSChris Mason } else 12574cb5300bSChris Mason goto out_ra; 12584cb5300bSChris Mason } else { 12591e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12604cb5300bSChris Mason } 12614cb5300bSChris Mason if (!max_to_defrag) 12627ec31b54SLiu Bo max_to_defrag = last_index + 1; 12634cb5300bSChris Mason 12642a0f7f57SLi Zefan /* 12652a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12662a0f7f57SLi Zefan * written sequentially. 12672a0f7f57SLi Zefan */ 12682a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12692a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12702a0f7f57SLi Zefan 1271f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1272f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1273f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 12744cb5300bSChris Mason /* 12754cb5300bSChris Mason * make sure we stop running if someone unmounts 12764cb5300bSChris Mason * the FS 12774cb5300bSChris Mason */ 12784cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12794cb5300bSChris Mason break; 12804cb5300bSChris Mason 1281210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1282efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1283210549ebSDavid Sterba ret = -EAGAIN; 1284210549ebSDavid Sterba break; 1285210549ebSDavid Sterba } 1286210549ebSDavid Sterba 128766c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 12886c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1289a43a2111SAndrew Mahone &defrag_end, range->flags & 1290a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1291940100a4SChris Mason unsigned long next; 1292940100a4SChris Mason /* 1293940100a4SChris Mason * the should_defrag function tells us how much to skip 1294940100a4SChris Mason * bump our counter by the suggested amount 1295940100a4SChris Mason */ 1296940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1297940100a4SChris Mason i = max(i + 1, next); 1298940100a4SChris Mason continue; 1299940100a4SChris Mason } 1300008873eaSLi Zefan 1301008873eaSLi Zefan if (!newer_than) { 1302008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1303008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1304008873eaSLi Zefan cluster = min(cluster, max_cluster); 1305008873eaSLi Zefan } else { 1306008873eaSLi Zefan cluster = max_cluster; 1307008873eaSLi Zefan } 1308008873eaSLi Zefan 1309008873eaSLi Zefan if (i + cluster > ra_index) { 1310008873eaSLi Zefan ra_index = max(i, ra_index); 1311008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1312008873eaSLi Zefan cluster); 1313008873eaSLi Zefan ra_index += max_cluster; 1314008873eaSLi Zefan } 13154cb5300bSChris Mason 1316ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1317633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1318633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1319008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1320ecb8bea8SLiu Bo if (ret < 0) { 1321ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13224cb5300bSChris Mason goto out_ra; 1323ecb8bea8SLiu Bo } 13244cb5300bSChris Mason 13254cb5300bSChris Mason defrag_count += ret; 1326d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1327ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13284cb5300bSChris Mason 13294cb5300bSChris Mason if (newer_than) { 13304cb5300bSChris Mason if (newer_off == (u64)-1) 13314cb5300bSChris Mason break; 13324cb5300bSChris Mason 1333e1f041e1SLiu Bo if (ret > 0) 1334e1f041e1SLiu Bo i += ret; 1335e1f041e1SLiu Bo 13364cb5300bSChris Mason newer_off = max(newer_off + 1, 13374cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13384cb5300bSChris Mason 13394cb5300bSChris Mason ret = find_new_extents(root, inode, 13404cb5300bSChris Mason newer_than, &newer_off, 13414cb5300bSChris Mason 64 * 1024); 13424cb5300bSChris Mason if (!ret) { 13434cb5300bSChris Mason range->start = newer_off; 13444cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13454cb5300bSChris Mason } else { 13464cb5300bSChris Mason break; 1347940100a4SChris Mason } 13484cb5300bSChris Mason } else { 1349008873eaSLi Zefan if (ret > 0) { 1350cbcc8326SLi Zefan i += ret; 1351008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1352008873eaSLi Zefan } else { 1353940100a4SChris Mason i++; 1354008873eaSLi Zefan last_len = 0; 1355008873eaSLi Zefan } 1356f46b5a66SChristoph Hellwig } 13574cb5300bSChris Mason } 1358f46b5a66SChristoph Hellwig 13591e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13601e701a32SChris Mason filemap_flush(inode->i_mapping); 13611e701a32SChris Mason 13621e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13631e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13641e701a32SChris Mason * we have to make sure the IO is actually started and that 13651e701a32SChris Mason * ordered extents get created before we return 13661e701a32SChris Mason */ 13671e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13681e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13691e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13701e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13711e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13721e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13731e701a32SChris Mason } 13741e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 13751e701a32SChris Mason } 13761e701a32SChris Mason 13771a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 13782b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 13791a419d85SLi Zefan } 13801a419d85SLi Zefan 138160ccf82fSDiego Calleja ret = defrag_count; 1382940100a4SChris Mason 13834cb5300bSChris Mason out_ra: 1384633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1385633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1386633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1387633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1388633085c7SFilipe David Borba Manana } 13894cb5300bSChris Mason if (!file) 13904cb5300bSChris Mason kfree(ra); 13914cb5300bSChris Mason kfree(pages); 1392940100a4SChris Mason return ret; 1393f46b5a66SChristoph Hellwig } 1394f46b5a66SChristoph Hellwig 1395198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 139676dda93cSYan, Zheng void __user *arg) 1397f46b5a66SChristoph Hellwig { 1398f46b5a66SChristoph Hellwig u64 new_size; 1399f46b5a66SChristoph Hellwig u64 old_size; 1400f46b5a66SChristoph Hellwig u64 devid = 1; 1401496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1402f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1403f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1404f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1405f46b5a66SChristoph Hellwig char *sizestr; 1406f46b5a66SChristoph Hellwig char *devstr = NULL; 1407f46b5a66SChristoph Hellwig int ret = 0; 1408f46b5a66SChristoph Hellwig int mod = 0; 1409f46b5a66SChristoph Hellwig 1410e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1411e441d54dSChris Mason return -EPERM; 1412e441d54dSChris Mason 1413198605a8SMiao Xie ret = mnt_want_write_file(file); 1414198605a8SMiao Xie if (ret) 1415198605a8SMiao Xie return ret; 1416198605a8SMiao Xie 14175ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14185ac00addSStefan Behrens 1)) { 141997547676SMiao Xie mnt_drop_write_file(file); 1420e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1421c9e9f97bSIlya Dryomov } 1422c9e9f97bSIlya Dryomov 14235ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1424dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1425c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1426c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1427c9e9f97bSIlya Dryomov goto out; 1428c9e9f97bSIlya Dryomov } 14295516e595SMark Fasheh 14305516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1431f46b5a66SChristoph Hellwig 1432f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1433f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1434f46b5a66SChristoph Hellwig if (devstr) { 1435f46b5a66SChristoph Hellwig char *end; 1436f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1437f46b5a66SChristoph Hellwig *devstr = '\0'; 1438f46b5a66SChristoph Hellwig devstr = vol_args->name; 1439f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1440dfd79829SMiao Xie if (!devid) { 1441dfd79829SMiao Xie ret = -EINVAL; 1442dfd79829SMiao Xie goto out_free; 1443dfd79829SMiao Xie } 1444efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1445f46b5a66SChristoph Hellwig } 1446dba60f3fSMiao Xie 1447aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1448f46b5a66SChristoph Hellwig if (!device) { 1449efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1450c1c9ff7cSGeert Uytterhoeven devid); 1451dfd79829SMiao Xie ret = -ENODEV; 1452c9e9f97bSIlya Dryomov goto out_free; 1453f46b5a66SChristoph Hellwig } 1454dba60f3fSMiao Xie 1455dba60f3fSMiao Xie if (!device->writeable) { 1456efe120a0SFrank Holton btrfs_info(root->fs_info, 1457efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1458c1c9ff7cSGeert Uytterhoeven devid); 1459dfd79829SMiao Xie ret = -EPERM; 14604e42ae1bSLiu Bo goto out_free; 14614e42ae1bSLiu Bo } 14624e42ae1bSLiu Bo 1463f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1464f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1465f46b5a66SChristoph Hellwig else { 1466f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1467f46b5a66SChristoph Hellwig mod = -1; 1468f46b5a66SChristoph Hellwig sizestr++; 1469f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1470f46b5a66SChristoph Hellwig mod = 1; 1471f46b5a66SChristoph Hellwig sizestr++; 1472f46b5a66SChristoph Hellwig } 147391748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1474f46b5a66SChristoph Hellwig if (new_size == 0) { 1475f46b5a66SChristoph Hellwig ret = -EINVAL; 1476c9e9f97bSIlya Dryomov goto out_free; 1477f46b5a66SChristoph Hellwig } 1478f46b5a66SChristoph Hellwig } 1479f46b5a66SChristoph Hellwig 148063a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1481dfd79829SMiao Xie ret = -EPERM; 148263a212abSStefan Behrens goto out_free; 148363a212abSStefan Behrens } 148463a212abSStefan Behrens 1485f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1486f46b5a66SChristoph Hellwig 1487f46b5a66SChristoph Hellwig if (mod < 0) { 1488f46b5a66SChristoph Hellwig if (new_size > old_size) { 1489f46b5a66SChristoph Hellwig ret = -EINVAL; 1490c9e9f97bSIlya Dryomov goto out_free; 1491f46b5a66SChristoph Hellwig } 1492f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1493f46b5a66SChristoph Hellwig } else if (mod > 0) { 1494eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1495eb8052e0SWenliang Fan ret = -EINVAL; 1496eb8052e0SWenliang Fan goto out_free; 1497eb8052e0SWenliang Fan } 1498f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1499f46b5a66SChristoph Hellwig } 1500f46b5a66SChristoph Hellwig 1501f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1502f46b5a66SChristoph Hellwig ret = -EINVAL; 1503c9e9f97bSIlya Dryomov goto out_free; 1504f46b5a66SChristoph Hellwig } 1505f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1506f46b5a66SChristoph Hellwig ret = -EFBIG; 1507c9e9f97bSIlya Dryomov goto out_free; 1508f46b5a66SChristoph Hellwig } 1509f46b5a66SChristoph Hellwig 1510f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1511f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1512f46b5a66SChristoph Hellwig 1513efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1514c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1515f46b5a66SChristoph Hellwig 1516f46b5a66SChristoph Hellwig if (new_size > old_size) { 1517a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 151898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 151998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1520c9e9f97bSIlya Dryomov goto out_free; 152198d5dc13STsutomu Itoh } 1522f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1523f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1524ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1525f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15260253f40eSjeff.liu } /* equal, nothing need to do */ 1527f46b5a66SChristoph Hellwig 1528c9e9f97bSIlya Dryomov out_free: 1529f46b5a66SChristoph Hellwig kfree(vol_args); 1530c9e9f97bSIlya Dryomov out: 1531c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15325ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 153318f39c41SIlya Dryomov mnt_drop_write_file(file); 1534f46b5a66SChristoph Hellwig return ret; 1535f46b5a66SChristoph Hellwig } 1536f46b5a66SChristoph Hellwig 153772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15386f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15396f72c7e2SArne Jansen u64 *transid, bool readonly, 15408696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1541f46b5a66SChristoph Hellwig { 1542f46b5a66SChristoph Hellwig int namelen; 15433de4586cSChris Mason int ret = 0; 1544f46b5a66SChristoph Hellwig 1545a874a63eSLiu Bo ret = mnt_want_write_file(file); 1546a874a63eSLiu Bo if (ret) 1547a874a63eSLiu Bo goto out; 1548a874a63eSLiu Bo 154972fd032eSSage Weil namelen = strlen(name); 155072fd032eSSage Weil if (strchr(name, '/')) { 1551f46b5a66SChristoph Hellwig ret = -EINVAL; 1552a874a63eSLiu Bo goto out_drop_write; 1553f46b5a66SChristoph Hellwig } 1554f46b5a66SChristoph Hellwig 155516780cabSChris Mason if (name[0] == '.' && 155616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 155716780cabSChris Mason ret = -EEXIST; 1558a874a63eSLiu Bo goto out_drop_write; 155916780cabSChris Mason } 156016780cabSChris Mason 15613de4586cSChris Mason if (subvol) { 156272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15636f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1564cb8e7090SChristoph Hellwig } else { 15652903ff01SAl Viro struct fd src = fdget(fd); 15663de4586cSChris Mason struct inode *src_inode; 15672903ff01SAl Viro if (!src.file) { 15683de4586cSChris Mason ret = -EINVAL; 1569a874a63eSLiu Bo goto out_drop_write; 15703de4586cSChris Mason } 15713de4586cSChris Mason 1572496ad9aaSAl Viro src_inode = file_inode(src.file); 1573496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1574efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1575efe120a0SFrank Holton "Snapshot src from another FS"); 15763de4586cSChris Mason ret = -EINVAL; 1577ecd18815SAl Viro } else { 157872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 157972fd032eSSage Weil BTRFS_I(src_inode)->root, 15806f72c7e2SArne Jansen transid, readonly, inherit); 1581ecd18815SAl Viro } 15822903ff01SAl Viro fdput(src); 1583cb8e7090SChristoph Hellwig } 1584a874a63eSLiu Bo out_drop_write: 1585a874a63eSLiu Bo mnt_drop_write_file(file); 1586f46b5a66SChristoph Hellwig out: 158772fd032eSSage Weil return ret; 158872fd032eSSage Weil } 158972fd032eSSage Weil 159072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1591fa0d2b9bSLi Zefan void __user *arg, int subvol) 159272fd032eSSage Weil { 1593fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 159472fd032eSSage Weil int ret; 159572fd032eSSage Weil 1596fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1597fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1598fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1599fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1600fa0d2b9bSLi Zefan 1601fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1602b83cc969SLi Zefan vol_args->fd, subvol, 16036f72c7e2SArne Jansen NULL, false, NULL); 1604fa0d2b9bSLi Zefan 1605fa0d2b9bSLi Zefan kfree(vol_args); 1606fa0d2b9bSLi Zefan return ret; 1607fa0d2b9bSLi Zefan } 1608fa0d2b9bSLi Zefan 1609fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1610fa0d2b9bSLi Zefan void __user *arg, int subvol) 1611fa0d2b9bSLi Zefan { 1612fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1613fa0d2b9bSLi Zefan int ret; 1614fdfb1e4fSLi Zefan u64 transid = 0; 1615fdfb1e4fSLi Zefan u64 *ptr = NULL; 1616b83cc969SLi Zefan bool readonly = false; 16176f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 161872fd032eSSage Weil 1619fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1620fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1621fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1622fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1623fdfb1e4fSLi Zefan 1624b83cc969SLi Zefan if (vol_args->flags & 16256f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 16266f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1627b83cc969SLi Zefan ret = -EOPNOTSUPP; 1628fdfb1e4fSLi Zefan goto out; 1629fdfb1e4fSLi Zefan } 1630fdfb1e4fSLi Zefan 1631fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1632fdfb1e4fSLi Zefan ptr = &transid; 1633b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1634b83cc969SLi Zefan readonly = true; 16356f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16366f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16376f72c7e2SArne Jansen ret = -EINVAL; 16386f72c7e2SArne Jansen goto out; 16396f72c7e2SArne Jansen } 16406f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16416f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16426f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16436f72c7e2SArne Jansen goto out; 16446f72c7e2SArne Jansen } 16456f72c7e2SArne Jansen } 164675eaa0e2SSage Weil 1647fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16486f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16498696c533SMiao Xie readonly, inherit); 165075eaa0e2SSage Weil 1651fdfb1e4fSLi Zefan if (ret == 0 && ptr && 165275eaa0e2SSage Weil copy_to_user(arg + 1653fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1654fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 165575eaa0e2SSage Weil ret = -EFAULT; 1656fdfb1e4fSLi Zefan out: 1657f46b5a66SChristoph Hellwig kfree(vol_args); 16586f72c7e2SArne Jansen kfree(inherit); 1659f46b5a66SChristoph Hellwig return ret; 1660f46b5a66SChristoph Hellwig } 1661f46b5a66SChristoph Hellwig 16620caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16630caa102dSLi Zefan void __user *arg) 16640caa102dSLi Zefan { 1665496ad9aaSAl Viro struct inode *inode = file_inode(file); 16660caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16670caa102dSLi Zefan int ret = 0; 16680caa102dSLi Zefan u64 flags = 0; 16690caa102dSLi Zefan 167033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 16710caa102dSLi Zefan return -EINVAL; 16720caa102dSLi Zefan 16730caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 16740caa102dSLi Zefan if (btrfs_root_readonly(root)) 16750caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 16760caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 16770caa102dSLi Zefan 16780caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 16790caa102dSLi Zefan ret = -EFAULT; 16800caa102dSLi Zefan 16810caa102dSLi Zefan return ret; 16820caa102dSLi Zefan } 16830caa102dSLi Zefan 16840caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 16850caa102dSLi Zefan void __user *arg) 16860caa102dSLi Zefan { 1687496ad9aaSAl Viro struct inode *inode = file_inode(file); 16880caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16890caa102dSLi Zefan struct btrfs_trans_handle *trans; 16900caa102dSLi Zefan u64 root_flags; 16910caa102dSLi Zefan u64 flags; 16920caa102dSLi Zefan int ret = 0; 16930caa102dSLi Zefan 1694b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1695b9ca0664SLiu Bo if (ret) 1696b9ca0664SLiu Bo goto out; 16970caa102dSLi Zefan 1698b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1699b9ca0664SLiu Bo ret = -EINVAL; 1700b9ca0664SLiu Bo goto out_drop_write; 1701b9ca0664SLiu Bo } 17020caa102dSLi Zefan 1703b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1704b9ca0664SLiu Bo ret = -EFAULT; 1705b9ca0664SLiu Bo goto out_drop_write; 1706b9ca0664SLiu Bo } 17070caa102dSLi Zefan 1708b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1709b9ca0664SLiu Bo ret = -EINVAL; 1710b9ca0664SLiu Bo goto out_drop_write; 1711b9ca0664SLiu Bo } 17120caa102dSLi Zefan 1713b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1714b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1715b9ca0664SLiu Bo goto out_drop_write; 1716b9ca0664SLiu Bo } 17170caa102dSLi Zefan 1718b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1719b9ca0664SLiu Bo ret = -EACCES; 1720b9ca0664SLiu Bo goto out_drop_write; 1721b9ca0664SLiu Bo } 1722b4dc2b8cSLi Zefan 17230caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17240caa102dSLi Zefan 17250caa102dSLi Zefan /* nothing to do */ 17260caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1727b9ca0664SLiu Bo goto out_drop_sem; 17280caa102dSLi Zefan 17290caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17302c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 17310caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17320caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17332c686537SDavid Sterba } else { 17342c686537SDavid Sterba /* 17352c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 17362c686537SDavid Sterba * send 17372c686537SDavid Sterba */ 17382c686537SDavid Sterba spin_lock(&root->root_item_lock); 17392c686537SDavid Sterba if (root->send_in_progress == 0) { 17400caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17410caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17422c686537SDavid Sterba spin_unlock(&root->root_item_lock); 17432c686537SDavid Sterba } else { 17442c686537SDavid Sterba spin_unlock(&root->root_item_lock); 17452c686537SDavid Sterba btrfs_warn(root->fs_info, 17462c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 17472c686537SDavid Sterba root->root_key.objectid); 17482c686537SDavid Sterba ret = -EPERM; 17492c686537SDavid Sterba goto out_drop_sem; 17502c686537SDavid Sterba } 17512c686537SDavid Sterba } 17520caa102dSLi Zefan 17530caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17540caa102dSLi Zefan if (IS_ERR(trans)) { 17550caa102dSLi Zefan ret = PTR_ERR(trans); 17560caa102dSLi Zefan goto out_reset; 17570caa102dSLi Zefan } 17580caa102dSLi Zefan 1759b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17600caa102dSLi Zefan &root->root_key, &root->root_item); 17610caa102dSLi Zefan 17620caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17630caa102dSLi Zefan out_reset: 17640caa102dSLi Zefan if (ret) 17650caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1766b9ca0664SLiu Bo out_drop_sem: 17670caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1768b9ca0664SLiu Bo out_drop_write: 1769b9ca0664SLiu Bo mnt_drop_write_file(file); 1770b9ca0664SLiu Bo out: 17710caa102dSLi Zefan return ret; 17720caa102dSLi Zefan } 17730caa102dSLi Zefan 177476dda93cSYan, Zheng /* 177576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 177676dda93cSYan, Zheng */ 177776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 177876dda93cSYan, Zheng { 177976dda93cSYan, Zheng struct btrfs_path *path; 1780175a2b87SJosef Bacik struct btrfs_dir_item *di; 178176dda93cSYan, Zheng struct btrfs_key key; 1782175a2b87SJosef Bacik u64 dir_id; 178376dda93cSYan, Zheng int ret; 178476dda93cSYan, Zheng 178576dda93cSYan, Zheng path = btrfs_alloc_path(); 178676dda93cSYan, Zheng if (!path) 178776dda93cSYan, Zheng return -ENOMEM; 178876dda93cSYan, Zheng 1789175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1790175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1791175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1792175a2b87SJosef Bacik dir_id, "default", 7, 0); 1793175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1794175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1795175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1796175a2b87SJosef Bacik ret = -ENOTEMPTY; 1797175a2b87SJosef Bacik goto out; 1798175a2b87SJosef Bacik } 1799175a2b87SJosef Bacik btrfs_release_path(path); 1800175a2b87SJosef Bacik } 1801175a2b87SJosef Bacik 180276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 180376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 180476dda93cSYan, Zheng key.offset = (u64)-1; 180576dda93cSYan, Zheng 180676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 180776dda93cSYan, Zheng &key, path, 0, 0); 180876dda93cSYan, Zheng if (ret < 0) 180976dda93cSYan, Zheng goto out; 181076dda93cSYan, Zheng BUG_ON(ret == 0); 181176dda93cSYan, Zheng 181276dda93cSYan, Zheng ret = 0; 181376dda93cSYan, Zheng if (path->slots[0] > 0) { 181476dda93cSYan, Zheng path->slots[0]--; 181576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 181676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 181776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 181876dda93cSYan, Zheng ret = -ENOTEMPTY; 181976dda93cSYan, Zheng } 182076dda93cSYan, Zheng out: 182176dda93cSYan, Zheng btrfs_free_path(path); 182276dda93cSYan, Zheng return ret; 182376dda93cSYan, Zheng } 182476dda93cSYan, Zheng 1825ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1826ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1827ac8e9819SChris Mason { 1828abc6e134SChris Mason struct btrfs_key test; 1829abc6e134SChris Mason int ret; 1830abc6e134SChris Mason 1831abc6e134SChris Mason test.objectid = sk->min_objectid; 1832abc6e134SChris Mason test.type = sk->min_type; 1833abc6e134SChris Mason test.offset = sk->min_offset; 1834abc6e134SChris Mason 1835abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1836abc6e134SChris Mason if (ret < 0) 1837ac8e9819SChris Mason return 0; 1838abc6e134SChris Mason 1839abc6e134SChris Mason test.objectid = sk->max_objectid; 1840abc6e134SChris Mason test.type = sk->max_type; 1841abc6e134SChris Mason test.offset = sk->max_offset; 1842abc6e134SChris Mason 1843abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1844abc6e134SChris Mason if (ret > 0) 1845ac8e9819SChris Mason return 0; 1846ac8e9819SChris Mason return 1; 1847ac8e9819SChris Mason } 1848ac8e9819SChris Mason 1849ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1850ac8e9819SChris Mason struct btrfs_path *path, 1851ac8e9819SChris Mason struct btrfs_key *key, 1852ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1853ac8e9819SChris Mason char *buf, 1854ac8e9819SChris Mason unsigned long *sk_offset, 1855ac8e9819SChris Mason int *num_found) 1856ac8e9819SChris Mason { 1857ac8e9819SChris Mason u64 found_transid; 1858ac8e9819SChris Mason struct extent_buffer *leaf; 1859ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1860ac8e9819SChris Mason unsigned long item_off; 1861ac8e9819SChris Mason unsigned long item_len; 1862ac8e9819SChris Mason int nritems; 1863ac8e9819SChris Mason int i; 1864ac8e9819SChris Mason int slot; 1865ac8e9819SChris Mason int ret = 0; 1866ac8e9819SChris Mason 1867ac8e9819SChris Mason leaf = path->nodes[0]; 1868ac8e9819SChris Mason slot = path->slots[0]; 1869ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1870ac8e9819SChris Mason 1871ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1872ac8e9819SChris Mason i = nritems; 1873ac8e9819SChris Mason goto advance_key; 1874ac8e9819SChris Mason } 1875ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1876ac8e9819SChris Mason 1877ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1878ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1879ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1880ac8e9819SChris Mason 188103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 188203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 188303b71c6cSGabriel de Perthuis continue; 188403b71c6cSGabriel de Perthuis 188503b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1886ac8e9819SChris Mason item_len = 0; 1887ac8e9819SChris Mason 1888ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1889ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1890ac8e9819SChris Mason ret = 1; 1891ac8e9819SChris Mason goto overflow; 1892ac8e9819SChris Mason } 1893ac8e9819SChris Mason 1894ac8e9819SChris Mason sh.objectid = key->objectid; 1895ac8e9819SChris Mason sh.offset = key->offset; 1896ac8e9819SChris Mason sh.type = key->type; 1897ac8e9819SChris Mason sh.len = item_len; 1898ac8e9819SChris Mason sh.transid = found_transid; 1899ac8e9819SChris Mason 1900ac8e9819SChris Mason /* copy search result header */ 1901ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1902ac8e9819SChris Mason *sk_offset += sizeof(sh); 1903ac8e9819SChris Mason 1904ac8e9819SChris Mason if (item_len) { 1905ac8e9819SChris Mason char *p = buf + *sk_offset; 1906ac8e9819SChris Mason /* copy the item */ 1907ac8e9819SChris Mason read_extent_buffer(leaf, p, 1908ac8e9819SChris Mason item_off, item_len); 1909ac8e9819SChris Mason *sk_offset += item_len; 1910ac8e9819SChris Mason } 1911e2156867SHugo Mills (*num_found)++; 1912ac8e9819SChris Mason 1913ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1914ac8e9819SChris Mason break; 1915ac8e9819SChris Mason } 1916ac8e9819SChris Mason advance_key: 1917ac8e9819SChris Mason ret = 0; 1918abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1919abc6e134SChris Mason key->offset++; 1920abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1921abc6e134SChris Mason key->offset = 0; 1922abc6e134SChris Mason key->type++; 1923abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1924abc6e134SChris Mason key->offset = 0; 1925abc6e134SChris Mason key->type = 0; 1926abc6e134SChris Mason key->objectid++; 1927abc6e134SChris Mason } else 1928abc6e134SChris Mason ret = 1; 1929ac8e9819SChris Mason overflow: 1930ac8e9819SChris Mason return ret; 1931ac8e9819SChris Mason } 1932ac8e9819SChris Mason 1933ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1934ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1935ac8e9819SChris Mason { 1936ac8e9819SChris Mason struct btrfs_root *root; 1937ac8e9819SChris Mason struct btrfs_key key; 1938ac8e9819SChris Mason struct btrfs_path *path; 1939ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1940ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1941ac8e9819SChris Mason int ret; 1942ac8e9819SChris Mason int num_found = 0; 1943ac8e9819SChris Mason unsigned long sk_offset = 0; 1944ac8e9819SChris Mason 1945ac8e9819SChris Mason path = btrfs_alloc_path(); 1946ac8e9819SChris Mason if (!path) 1947ac8e9819SChris Mason return -ENOMEM; 1948ac8e9819SChris Mason 1949ac8e9819SChris Mason if (sk->tree_id == 0) { 1950ac8e9819SChris Mason /* search the root of the inode that was passed */ 1951ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1952ac8e9819SChris Mason } else { 1953ac8e9819SChris Mason key.objectid = sk->tree_id; 1954ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1955ac8e9819SChris Mason key.offset = (u64)-1; 1956ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1957ac8e9819SChris Mason if (IS_ERR(root)) { 1958efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 1959ac8e9819SChris Mason sk->tree_id); 1960ac8e9819SChris Mason btrfs_free_path(path); 1961ac8e9819SChris Mason return -ENOENT; 1962ac8e9819SChris Mason } 1963ac8e9819SChris Mason } 1964ac8e9819SChris Mason 1965ac8e9819SChris Mason key.objectid = sk->min_objectid; 1966ac8e9819SChris Mason key.type = sk->min_type; 1967ac8e9819SChris Mason key.offset = sk->min_offset; 1968ac8e9819SChris Mason 1969ac8e9819SChris Mason path->keep_locks = 1; 1970ac8e9819SChris Mason 1971ac8e9819SChris Mason while (1) { 19726174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1973ac8e9819SChris Mason if (ret != 0) { 1974ac8e9819SChris Mason if (ret > 0) 1975ac8e9819SChris Mason ret = 0; 1976ac8e9819SChris Mason goto err; 1977ac8e9819SChris Mason } 1978ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1979ac8e9819SChris Mason &sk_offset, &num_found); 1980b3b4aa74SDavid Sterba btrfs_release_path(path); 1981ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1982ac8e9819SChris Mason break; 1983ac8e9819SChris Mason 1984ac8e9819SChris Mason } 1985ac8e9819SChris Mason ret = 0; 1986ac8e9819SChris Mason err: 1987ac8e9819SChris Mason sk->nr_items = num_found; 1988ac8e9819SChris Mason btrfs_free_path(path); 1989ac8e9819SChris Mason return ret; 1990ac8e9819SChris Mason } 1991ac8e9819SChris Mason 1992ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1993ac8e9819SChris Mason void __user *argp) 1994ac8e9819SChris Mason { 1995ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1996ac8e9819SChris Mason struct inode *inode; 1997ac8e9819SChris Mason int ret; 1998ac8e9819SChris Mason 1999ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2000ac8e9819SChris Mason return -EPERM; 2001ac8e9819SChris Mason 20022354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20032354d08fSJulia Lawall if (IS_ERR(args)) 20042354d08fSJulia Lawall return PTR_ERR(args); 2005ac8e9819SChris Mason 2006496ad9aaSAl Viro inode = file_inode(file); 2007ac8e9819SChris Mason ret = search_ioctl(inode, args); 2008ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2009ac8e9819SChris Mason ret = -EFAULT; 2010ac8e9819SChris Mason kfree(args); 2011ac8e9819SChris Mason return ret; 2012ac8e9819SChris Mason } 2013ac8e9819SChris Mason 201498d377a0STARUISI Hiroaki /* 2015ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2016ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 201798d377a0STARUISI Hiroaki */ 201898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 201998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 202098d377a0STARUISI Hiroaki { 202198d377a0STARUISI Hiroaki struct btrfs_root *root; 202298d377a0STARUISI Hiroaki struct btrfs_key key; 2023ac8e9819SChris Mason char *ptr; 202498d377a0STARUISI Hiroaki int ret = -1; 202598d377a0STARUISI Hiroaki int slot; 202698d377a0STARUISI Hiroaki int len; 202798d377a0STARUISI Hiroaki int total_len = 0; 202898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 202998d377a0STARUISI Hiroaki struct extent_buffer *l; 203098d377a0STARUISI Hiroaki struct btrfs_path *path; 203198d377a0STARUISI Hiroaki 203298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 203398d377a0STARUISI Hiroaki name[0]='\0'; 203498d377a0STARUISI Hiroaki return 0; 203598d377a0STARUISI Hiroaki } 203698d377a0STARUISI Hiroaki 203798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 203898d377a0STARUISI Hiroaki if (!path) 203998d377a0STARUISI Hiroaki return -ENOMEM; 204098d377a0STARUISI Hiroaki 2041ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 204298d377a0STARUISI Hiroaki 204398d377a0STARUISI Hiroaki key.objectid = tree_id; 204498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 204598d377a0STARUISI Hiroaki key.offset = (u64)-1; 204698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 204798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2048efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 20498ad6fcabSChris Mason ret = -ENOENT; 20508ad6fcabSChris Mason goto out; 205198d377a0STARUISI Hiroaki } 205298d377a0STARUISI Hiroaki 205398d377a0STARUISI Hiroaki key.objectid = dirid; 205498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20558ad6fcabSChris Mason key.offset = (u64)-1; 205698d377a0STARUISI Hiroaki 205798d377a0STARUISI Hiroaki while (1) { 205898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 205998d377a0STARUISI Hiroaki if (ret < 0) 206098d377a0STARUISI Hiroaki goto out; 206118674c6cSFilipe David Borba Manana else if (ret > 0) { 206218674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 206318674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 206418674c6cSFilipe David Borba Manana if (ret < 0) 206518674c6cSFilipe David Borba Manana goto out; 206618674c6cSFilipe David Borba Manana else if (ret > 0) { 2067ac8e9819SChris Mason ret = -ENOENT; 206898d377a0STARUISI Hiroaki goto out; 2069ac8e9819SChris Mason } 207018674c6cSFilipe David Borba Manana } 207118674c6cSFilipe David Borba Manana 207218674c6cSFilipe David Borba Manana l = path->nodes[0]; 207318674c6cSFilipe David Borba Manana slot = path->slots[0]; 207418674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 207598d377a0STARUISI Hiroaki 207698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 207798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 207898d377a0STARUISI Hiroaki ptr -= len + 1; 207998d377a0STARUISI Hiroaki total_len += len + 1; 2080a696cf35SFilipe David Borba Manana if (ptr < name) { 2081a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 208298d377a0STARUISI Hiroaki goto out; 2083a696cf35SFilipe David Borba Manana } 208498d377a0STARUISI Hiroaki 208598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 208698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 208798d377a0STARUISI Hiroaki 208898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 208998d377a0STARUISI Hiroaki break; 209098d377a0STARUISI Hiroaki 2091b3b4aa74SDavid Sterba btrfs_release_path(path); 209298d377a0STARUISI Hiroaki key.objectid = key.offset; 20938ad6fcabSChris Mason key.offset = (u64)-1; 209498d377a0STARUISI Hiroaki dirid = key.objectid; 209598d377a0STARUISI Hiroaki } 209677906a50SLi Zefan memmove(name, ptr, total_len); 209798d377a0STARUISI Hiroaki name[total_len] = '\0'; 209898d377a0STARUISI Hiroaki ret = 0; 209998d377a0STARUISI Hiroaki out: 210098d377a0STARUISI Hiroaki btrfs_free_path(path); 2101ac8e9819SChris Mason return ret; 2102ac8e9819SChris Mason } 2103ac8e9819SChris Mason 2104ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2105ac8e9819SChris Mason void __user *argp) 2106ac8e9819SChris Mason { 2107ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2108ac8e9819SChris Mason struct inode *inode; 2109ac8e9819SChris Mason int ret; 2110ac8e9819SChris Mason 2111ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2112ac8e9819SChris Mason return -EPERM; 2113ac8e9819SChris Mason 21142354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 21152354d08fSJulia Lawall if (IS_ERR(args)) 21162354d08fSJulia Lawall return PTR_ERR(args); 2117c2b96929SDan Carpenter 2118496ad9aaSAl Viro inode = file_inode(file); 2119ac8e9819SChris Mason 21201b53ac4dSChris Mason if (args->treeid == 0) 21211b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 21221b53ac4dSChris Mason 2123ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2124ac8e9819SChris Mason args->treeid, args->objectid, 2125ac8e9819SChris Mason args->name); 2126ac8e9819SChris Mason 2127ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2128ac8e9819SChris Mason ret = -EFAULT; 2129ac8e9819SChris Mason 2130ac8e9819SChris Mason kfree(args); 213198d377a0STARUISI Hiroaki return ret; 213298d377a0STARUISI Hiroaki } 213398d377a0STARUISI Hiroaki 213476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 213576dda93cSYan, Zheng void __user *arg) 213676dda93cSYan, Zheng { 213754563d41SAl Viro struct dentry *parent = file->f_path.dentry; 213876dda93cSYan, Zheng struct dentry *dentry; 213976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 214076dda93cSYan, Zheng struct inode *inode; 214176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 214276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 214376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 214476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2145c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2146c58aaad2SMiao Xie u64 qgroup_reserved; 214776dda93cSYan, Zheng int namelen; 214876dda93cSYan, Zheng int ret; 214976dda93cSYan, Zheng int err = 0; 215076dda93cSYan, Zheng 215176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 215276dda93cSYan, Zheng if (IS_ERR(vol_args)) 215376dda93cSYan, Zheng return PTR_ERR(vol_args); 215476dda93cSYan, Zheng 215576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 215676dda93cSYan, Zheng namelen = strlen(vol_args->name); 215776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 215876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 215976dda93cSYan, Zheng err = -EINVAL; 216076dda93cSYan, Zheng goto out; 216176dda93cSYan, Zheng } 216276dda93cSYan, Zheng 2163a561be71SAl Viro err = mnt_want_write_file(file); 216476dda93cSYan, Zheng if (err) 216576dda93cSYan, Zheng goto out; 216676dda93cSYan, Zheng 21675c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21685c50c9b8SDavid Sterba if (err == -EINTR) 2169e43f998eSDavid Sterba goto out_drop_write; 217076dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 217176dda93cSYan, Zheng if (IS_ERR(dentry)) { 217276dda93cSYan, Zheng err = PTR_ERR(dentry); 217376dda93cSYan, Zheng goto out_unlock_dir; 217476dda93cSYan, Zheng } 217576dda93cSYan, Zheng 217676dda93cSYan, Zheng if (!dentry->d_inode) { 217776dda93cSYan, Zheng err = -ENOENT; 217876dda93cSYan, Zheng goto out_dput; 217976dda93cSYan, Zheng } 218076dda93cSYan, Zheng 218176dda93cSYan, Zheng inode = dentry->d_inode; 21824260f7c7SSage Weil dest = BTRFS_I(inode)->root; 21834260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 21844260f7c7SSage Weil /* 21854260f7c7SSage Weil * Regular user. Only allow this with a special mount 21864260f7c7SSage Weil * option, when the user has write+exec access to the 21874260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 21884260f7c7SSage Weil * allowed. 21894260f7c7SSage Weil * 21904260f7c7SSage Weil * Note that this is _not_ check that the subvol is 21914260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 21924260f7c7SSage Weil * otherwise be able to delete. 21934260f7c7SSage Weil * 21944260f7c7SSage Weil * Users who want to delete empty subvols should try 21954260f7c7SSage Weil * rmdir(2). 21964260f7c7SSage Weil */ 21974260f7c7SSage Weil err = -EPERM; 21984260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 21994260f7c7SSage Weil goto out_dput; 22004260f7c7SSage Weil 22014260f7c7SSage Weil /* 22024260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 22034260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 22044260f7c7SSage Weil * must be called on the dentry referencing the root 22054260f7c7SSage Weil * of the subvol, not a random directory contained 22064260f7c7SSage Weil * within it. 22074260f7c7SSage Weil */ 22084260f7c7SSage Weil err = -EINVAL; 22094260f7c7SSage Weil if (root == dest) 22104260f7c7SSage Weil goto out_dput; 22114260f7c7SSage Weil 22124260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 22134260f7c7SSage Weil if (err) 22144260f7c7SSage Weil goto out_dput; 22155c39da5bSMiao Xie } 22164260f7c7SSage Weil 22175c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 22184260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 22194260f7c7SSage Weil if (err) 22204260f7c7SSage Weil goto out_dput; 22214260f7c7SSage Weil 222233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 222376dda93cSYan, Zheng err = -EINVAL; 222476dda93cSYan, Zheng goto out_dput; 222576dda93cSYan, Zheng } 222676dda93cSYan, Zheng 222776dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 222876dda93cSYan, Zheng err = d_invalidate(dentry); 222976dda93cSYan, Zheng if (err) 223076dda93cSYan, Zheng goto out_unlock; 223176dda93cSYan, Zheng 223276dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 223376dda93cSYan, Zheng 223476dda93cSYan, Zheng err = may_destroy_subvol(dest); 223576dda93cSYan, Zheng if (err) 223676dda93cSYan, Zheng goto out_up_write; 223776dda93cSYan, Zheng 2238c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2239c58aaad2SMiao Xie /* 2240c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2241c58aaad2SMiao Xie * ref/backref. 2242c58aaad2SMiao Xie */ 2243c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2244ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2245c58aaad2SMiao Xie if (err) 2246c58aaad2SMiao Xie goto out_up_write; 2247c58aaad2SMiao Xie 2248a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2249a22285a6SYan, Zheng if (IS_ERR(trans)) { 2250a22285a6SYan, Zheng err = PTR_ERR(trans); 2251c58aaad2SMiao Xie goto out_release; 2252a22285a6SYan, Zheng } 2253c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2254c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2255a22285a6SYan, Zheng 225676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 225776dda93cSYan, Zheng dest->root_key.objectid, 225876dda93cSYan, Zheng dentry->d_name.name, 225976dda93cSYan, Zheng dentry->d_name.len); 226079787eaaSJeff Mahoney if (ret) { 226179787eaaSJeff Mahoney err = ret; 226279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 226379787eaaSJeff Mahoney goto out_end_trans; 226479787eaaSJeff Mahoney } 226576dda93cSYan, Zheng 226676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 226776dda93cSYan, Zheng 226876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 226976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 227076dda93cSYan, Zheng dest->root_item.drop_level = 0; 227176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 227276dda93cSYan, Zheng 2273d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 227476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 227576dda93cSYan, Zheng root->fs_info->tree_root, 227676dda93cSYan, Zheng dest->root_key.objectid); 227779787eaaSJeff Mahoney if (ret) { 227879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 227979787eaaSJeff Mahoney err = ret; 228079787eaaSJeff Mahoney goto out_end_trans; 2281d68fc57bSYan, Zheng } 228279787eaaSJeff Mahoney } 2283dd5f9615SStefan Behrens 2284dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2285dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2286dd5f9615SStefan Behrens dest->root_key.objectid); 2287dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2288dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2289dd5f9615SStefan Behrens err = ret; 2290dd5f9615SStefan Behrens goto out_end_trans; 2291dd5f9615SStefan Behrens } 2292dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2293dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2294dd5f9615SStefan Behrens dest->root_item.received_uuid, 2295dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2296dd5f9615SStefan Behrens dest->root_key.objectid); 2297dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2298dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2299dd5f9615SStefan Behrens err = ret; 2300dd5f9615SStefan Behrens goto out_end_trans; 2301dd5f9615SStefan Behrens } 2302dd5f9615SStefan Behrens } 2303dd5f9615SStefan Behrens 230479787eaaSJeff Mahoney out_end_trans: 2305c58aaad2SMiao Xie trans->block_rsv = NULL; 2306c58aaad2SMiao Xie trans->bytes_reserved = 0; 2307531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 230879787eaaSJeff Mahoney if (ret && !err) 230979787eaaSJeff Mahoney err = ret; 231076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2311c58aaad2SMiao Xie out_release: 2312c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 231376dda93cSYan, Zheng out_up_write: 231476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 231576dda93cSYan, Zheng out_unlock: 231676dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 231776dda93cSYan, Zheng if (!err) { 2318efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 231976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 232076dda93cSYan, Zheng d_delete(dentry); 2321fa6ac876SLiu Bo 2322fa6ac876SLiu Bo /* the last ref */ 2323fa6ac876SLiu Bo if (dest->cache_inode) { 2324fa6ac876SLiu Bo iput(dest->cache_inode); 2325fa6ac876SLiu Bo dest->cache_inode = NULL; 2326fa6ac876SLiu Bo } 232776dda93cSYan, Zheng } 232876dda93cSYan, Zheng out_dput: 232976dda93cSYan, Zheng dput(dentry); 233076dda93cSYan, Zheng out_unlock_dir: 233176dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2332e43f998eSDavid Sterba out_drop_write: 23332a79f17eSAl Viro mnt_drop_write_file(file); 233476dda93cSYan, Zheng out: 233576dda93cSYan, Zheng kfree(vol_args); 233676dda93cSYan, Zheng return err; 233776dda93cSYan, Zheng } 233876dda93cSYan, Zheng 23391e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2340f46b5a66SChristoph Hellwig { 2341496ad9aaSAl Viro struct inode *inode = file_inode(file); 2342f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 23431e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2344c146afadSYan Zheng int ret; 2345c146afadSYan Zheng 234625122d15SIlya Dryomov ret = mnt_want_write_file(file); 234725122d15SIlya Dryomov if (ret) 234825122d15SIlya Dryomov return ret; 2349b83cc969SLi Zefan 235025122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 235125122d15SIlya Dryomov ret = -EROFS; 235225122d15SIlya Dryomov goto out; 23535ac00addSStefan Behrens } 2354f46b5a66SChristoph Hellwig 2355f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2356f46b5a66SChristoph Hellwig case S_IFDIR: 2357e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2358e441d54dSChris Mason ret = -EPERM; 2359e441d54dSChris Mason goto out; 2360e441d54dSChris Mason } 2361de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23628929ecfaSYan, Zheng if (ret) 23638929ecfaSYan, Zheng goto out; 2364de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2365f46b5a66SChristoph Hellwig break; 2366f46b5a66SChristoph Hellwig case S_IFREG: 2367e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2368e441d54dSChris Mason ret = -EINVAL; 2369e441d54dSChris Mason goto out; 2370e441d54dSChris Mason } 23711e701a32SChris Mason 23721e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 23731e701a32SChris Mason if (!range) { 23741e701a32SChris Mason ret = -ENOMEM; 23751e701a32SChris Mason goto out; 23761e701a32SChris Mason } 23771e701a32SChris Mason 23781e701a32SChris Mason if (argp) { 23791e701a32SChris Mason if (copy_from_user(range, argp, 23801e701a32SChris Mason sizeof(*range))) { 23811e701a32SChris Mason ret = -EFAULT; 23821e701a32SChris Mason kfree(range); 2383683be16eSDan Carpenter goto out; 23841e701a32SChris Mason } 23851e701a32SChris Mason /* compression requires us to start the IO */ 23861e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 23871e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 23881e701a32SChris Mason range->extent_thresh = (u32)-1; 23891e701a32SChris Mason } 23901e701a32SChris Mason } else { 23911e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 23921e701a32SChris Mason range->len = (u64)-1; 23931e701a32SChris Mason } 2394496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 23954cb5300bSChris Mason range, 0, 0); 23964cb5300bSChris Mason if (ret > 0) 23974cb5300bSChris Mason ret = 0; 23981e701a32SChris Mason kfree(range); 2399f46b5a66SChristoph Hellwig break; 24008929ecfaSYan, Zheng default: 24018929ecfaSYan, Zheng ret = -EINVAL; 2402f46b5a66SChristoph Hellwig } 2403e441d54dSChris Mason out: 240425122d15SIlya Dryomov mnt_drop_write_file(file); 2405e441d54dSChris Mason return ret; 2406f46b5a66SChristoph Hellwig } 2407f46b5a66SChristoph Hellwig 2408b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2409f46b5a66SChristoph Hellwig { 2410f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2411f46b5a66SChristoph Hellwig int ret; 2412f46b5a66SChristoph Hellwig 2413e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2414e441d54dSChris Mason return -EPERM; 2415e441d54dSChris Mason 24165ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 24175ac00addSStefan Behrens 1)) { 2418e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2419c9e9f97bSIlya Dryomov } 2420c9e9f97bSIlya Dryomov 24215ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2422dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2423c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2424c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2425c9e9f97bSIlya Dryomov goto out; 2426c9e9f97bSIlya Dryomov } 2427f46b5a66SChristoph Hellwig 24285516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2429f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2430f46b5a66SChristoph Hellwig 2431f46b5a66SChristoph Hellwig kfree(vol_args); 2432c9e9f97bSIlya Dryomov out: 2433c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24345ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2435f46b5a66SChristoph Hellwig return ret; 2436f46b5a66SChristoph Hellwig } 2437f46b5a66SChristoph Hellwig 2438da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2439f46b5a66SChristoph Hellwig { 2440496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2441f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2442f46b5a66SChristoph Hellwig int ret; 2443f46b5a66SChristoph Hellwig 2444e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2445e441d54dSChris Mason return -EPERM; 2446e441d54dSChris Mason 2447da24927bSMiao Xie ret = mnt_want_write_file(file); 2448da24927bSMiao Xie if (ret) 2449da24927bSMiao Xie return ret; 2450c146afadSYan Zheng 2451dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2452c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2453c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2454c9e9f97bSIlya Dryomov goto out; 2455c9e9f97bSIlya Dryomov } 2456f46b5a66SChristoph Hellwig 24575516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2458f46b5a66SChristoph Hellwig 2459183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2460183860f6SAnand Jain 1)) { 2461183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2462183860f6SAnand Jain goto out; 2463183860f6SAnand Jain } 2464183860f6SAnand Jain 2465183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2466183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2467c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24685ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2469183860f6SAnand Jain 2470183860f6SAnand Jain out: 2471183860f6SAnand Jain kfree(vol_args); 24724ac20c70SIlya Dryomov mnt_drop_write_file(file); 2473f46b5a66SChristoph Hellwig return ret; 2474f46b5a66SChristoph Hellwig } 2475f46b5a66SChristoph Hellwig 2476475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2477475f6387SJan Schmidt { 2478027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2479475f6387SJan Schmidt struct btrfs_device *device; 2480475f6387SJan Schmidt struct btrfs_device *next; 2481475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2482027ed2f0SLi Zefan int ret = 0; 2483475f6387SJan Schmidt 2484475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2485475f6387SJan Schmidt return -EPERM; 2486475f6387SJan Schmidt 2487027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2488027ed2f0SLi Zefan if (!fi_args) 2489027ed2f0SLi Zefan return -ENOMEM; 2490027ed2f0SLi Zefan 2491f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2492027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2493027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2494475f6387SJan Schmidt 2495475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2496027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2497027ed2f0SLi Zefan fi_args->max_id = device->devid; 2498475f6387SJan Schmidt } 2499475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2500475f6387SJan Schmidt 2501027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2502027ed2f0SLi Zefan ret = -EFAULT; 2503475f6387SJan Schmidt 2504027ed2f0SLi Zefan kfree(fi_args); 2505027ed2f0SLi Zefan return ret; 2506475f6387SJan Schmidt } 2507475f6387SJan Schmidt 2508475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2509475f6387SJan Schmidt { 2510475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2511475f6387SJan Schmidt struct btrfs_device *dev; 2512475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2513475f6387SJan Schmidt int ret = 0; 2514475f6387SJan Schmidt char *s_uuid = NULL; 2515475f6387SJan Schmidt 2516475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2517475f6387SJan Schmidt return -EPERM; 2518475f6387SJan Schmidt 2519475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2520475f6387SJan Schmidt if (IS_ERR(di_args)) 2521475f6387SJan Schmidt return PTR_ERR(di_args); 2522475f6387SJan Schmidt 2523dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2524475f6387SJan Schmidt s_uuid = di_args->uuid; 2525475f6387SJan Schmidt 2526475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2527aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2528475f6387SJan Schmidt 2529475f6387SJan Schmidt if (!dev) { 2530475f6387SJan Schmidt ret = -ENODEV; 2531475f6387SJan Schmidt goto out; 2532475f6387SJan Schmidt } 2533475f6387SJan Schmidt 2534475f6387SJan Schmidt di_args->devid = dev->devid; 2535475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2536475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2537475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2538a27202fbSJim Meyering if (dev->name) { 2539606686eeSJosef Bacik struct rcu_string *name; 2540606686eeSJosef Bacik 2541606686eeSJosef Bacik rcu_read_lock(); 2542606686eeSJosef Bacik name = rcu_dereference(dev->name); 2543606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2544606686eeSJosef Bacik rcu_read_unlock(); 2545a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2546a27202fbSJim Meyering } else { 254799ba55adSStefan Behrens di_args->path[0] = '\0'; 2548a27202fbSJim Meyering } 2549475f6387SJan Schmidt 2550475f6387SJan Schmidt out: 255155793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2552475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2553475f6387SJan Schmidt ret = -EFAULT; 2554475f6387SJan Schmidt 2555475f6387SJan Schmidt kfree(di_args); 2556475f6387SJan Schmidt return ret; 2557475f6387SJan Schmidt } 2558475f6387SJan Schmidt 2559416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2560416161dbSMark Fasheh { 2561416161dbSMark Fasheh struct page *page; 2562416161dbSMark Fasheh pgoff_t index; 2563416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2564416161dbSMark Fasheh 2565416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2566416161dbSMark Fasheh 2567416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2568416161dbSMark Fasheh if (!page) 2569416161dbSMark Fasheh return NULL; 2570416161dbSMark Fasheh 2571416161dbSMark Fasheh if (!PageUptodate(page)) { 2572416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2573416161dbSMark Fasheh 0)) 2574416161dbSMark Fasheh return NULL; 2575416161dbSMark Fasheh lock_page(page); 2576416161dbSMark Fasheh if (!PageUptodate(page)) { 2577416161dbSMark Fasheh unlock_page(page); 2578416161dbSMark Fasheh page_cache_release(page); 2579416161dbSMark Fasheh return NULL; 2580416161dbSMark Fasheh } 2581416161dbSMark Fasheh } 2582416161dbSMark Fasheh unlock_page(page); 2583416161dbSMark Fasheh 2584416161dbSMark Fasheh return page; 2585416161dbSMark Fasheh } 2586416161dbSMark Fasheh 258777fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 258877fe20dcSMark Fasheh { 258977fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 259077fe20dcSMark Fasheh another, and lock file content */ 259177fe20dcSMark Fasheh while (1) { 259277fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 259377fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 259477fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 259577fe20dcSMark Fasheh off + len - 1); 259677fe20dcSMark Fasheh if (!ordered && 259777fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 259877fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 259977fe20dcSMark Fasheh break; 260077fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 260177fe20dcSMark Fasheh if (ordered) 260277fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 260377fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 260477fe20dcSMark Fasheh } 260577fe20dcSMark Fasheh } 260677fe20dcSMark Fasheh 2607416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2608416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2609416161dbSMark Fasheh { 2610416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2611416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2612416161dbSMark Fasheh 2613416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2614416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2615416161dbSMark Fasheh } 2616416161dbSMark Fasheh 2617416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2618416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2619416161dbSMark Fasheh { 2620416161dbSMark Fasheh if (inode1 < inode2) { 2621416161dbSMark Fasheh swap(inode1, inode2); 2622416161dbSMark Fasheh swap(loff1, loff2); 2623416161dbSMark Fasheh } 2624416161dbSMark Fasheh 2625416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2626416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2627416161dbSMark Fasheh if (inode1 != inode2) { 2628416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2629416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2630416161dbSMark Fasheh } 2631416161dbSMark Fasheh } 2632416161dbSMark Fasheh 2633416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2634416161dbSMark Fasheh u64 dst_loff, u64 len) 2635416161dbSMark Fasheh { 2636416161dbSMark Fasheh int ret = 0; 2637416161dbSMark Fasheh struct page *src_page, *dst_page; 2638416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2639416161dbSMark Fasheh void *addr, *dst_addr; 2640416161dbSMark Fasheh 2641416161dbSMark Fasheh while (len) { 2642416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2643416161dbSMark Fasheh cmp_len = len; 2644416161dbSMark Fasheh 2645416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2646416161dbSMark Fasheh if (!src_page) 2647416161dbSMark Fasheh return -EINVAL; 2648416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2649416161dbSMark Fasheh if (!dst_page) { 2650416161dbSMark Fasheh page_cache_release(src_page); 2651416161dbSMark Fasheh return -EINVAL; 2652416161dbSMark Fasheh } 2653416161dbSMark Fasheh addr = kmap_atomic(src_page); 2654416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2655416161dbSMark Fasheh 2656416161dbSMark Fasheh flush_dcache_page(src_page); 2657416161dbSMark Fasheh flush_dcache_page(dst_page); 2658416161dbSMark Fasheh 2659416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2660416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2661416161dbSMark Fasheh 2662416161dbSMark Fasheh kunmap_atomic(addr); 2663416161dbSMark Fasheh kunmap_atomic(dst_addr); 2664416161dbSMark Fasheh page_cache_release(src_page); 2665416161dbSMark Fasheh page_cache_release(dst_page); 2666416161dbSMark Fasheh 2667416161dbSMark Fasheh if (ret) 2668416161dbSMark Fasheh break; 2669416161dbSMark Fasheh 2670416161dbSMark Fasheh loff += cmp_len; 2671416161dbSMark Fasheh dst_loff += cmp_len; 2672416161dbSMark Fasheh len -= cmp_len; 2673416161dbSMark Fasheh } 2674416161dbSMark Fasheh 2675416161dbSMark Fasheh return ret; 2676416161dbSMark Fasheh } 2677416161dbSMark Fasheh 2678416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2679416161dbSMark Fasheh { 2680416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2681416161dbSMark Fasheh 2682416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2683416161dbSMark Fasheh return -EINVAL; 2684416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2685416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2686416161dbSMark Fasheh return -EINVAL; 2687416161dbSMark Fasheh 2688416161dbSMark Fasheh return 0; 2689416161dbSMark Fasheh } 2690416161dbSMark Fasheh 2691416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2692416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2693416161dbSMark Fasheh { 2694416161dbSMark Fasheh int ret; 2695416161dbSMark Fasheh 2696416161dbSMark Fasheh /* 2697416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2698416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2699416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2700416161dbSMark Fasheh */ 2701416161dbSMark Fasheh if (src == dst) 2702416161dbSMark Fasheh return -EINVAL; 2703416161dbSMark Fasheh 2704416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2705416161dbSMark Fasheh 2706416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2707416161dbSMark Fasheh if (ret) 2708416161dbSMark Fasheh goto out_unlock; 2709416161dbSMark Fasheh 2710416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2711416161dbSMark Fasheh if (ret) 2712416161dbSMark Fasheh goto out_unlock; 2713416161dbSMark Fasheh 2714416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2715416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2716416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2717416161dbSMark Fasheh ret = -EINVAL; 2718416161dbSMark Fasheh goto out_unlock; 2719416161dbSMark Fasheh } 2720416161dbSMark Fasheh 2721416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2722416161dbSMark Fasheh if (ret == 0) 2723416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2724416161dbSMark Fasheh 2725416161dbSMark Fasheh out_unlock: 2726416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2727416161dbSMark Fasheh 2728416161dbSMark Fasheh return ret; 2729416161dbSMark Fasheh } 2730416161dbSMark Fasheh 2731416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2732416161dbSMark Fasheh 2733416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2734416161dbSMark Fasheh void __user *argp) 2735416161dbSMark Fasheh { 2736cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2737cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2738cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2739416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2740416161dbSMark Fasheh struct file *dst_file = NULL; 2741416161dbSMark Fasheh struct inode *dst; 2742416161dbSMark Fasheh u64 off; 2743416161dbSMark Fasheh u64 len; 2744416161dbSMark Fasheh int i; 2745416161dbSMark Fasheh int ret; 2746cbf8b8caSMark Fasheh unsigned long size; 2747416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2748416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2749416161dbSMark Fasheh 2750416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2751416161dbSMark Fasheh return -EINVAL; 2752416161dbSMark Fasheh 2753416161dbSMark Fasheh ret = mnt_want_write_file(file); 2754416161dbSMark Fasheh if (ret) 2755416161dbSMark Fasheh return ret; 2756416161dbSMark Fasheh 2757cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2758416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2759cbf8b8caSMark Fasheh sizeof(tmp))) { 2760416161dbSMark Fasheh ret = -EFAULT; 2761416161dbSMark Fasheh goto out; 2762416161dbSMark Fasheh } 2763416161dbSMark Fasheh 2764cbf8b8caSMark Fasheh size = sizeof(tmp) + 2765cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2766cbf8b8caSMark Fasheh 2767229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2768cbf8b8caSMark Fasheh 2769229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2770229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2771cbf8b8caSMark Fasheh goto out; 2772cbf8b8caSMark Fasheh } 2773cbf8b8caSMark Fasheh 2774cbf8b8caSMark Fasheh off = same->logical_offset; 2775cbf8b8caSMark Fasheh len = same->length; 2776416161dbSMark Fasheh 2777416161dbSMark Fasheh /* 2778416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2779416161dbSMark Fasheh * This is intended to bound the total time spent in this 2780416161dbSMark Fasheh * ioctl to something sane. 2781416161dbSMark Fasheh */ 2782416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2783416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2784416161dbSMark Fasheh 2785416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2786416161dbSMark Fasheh /* 2787416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2788416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2789416161dbSMark Fasheh * this situation without an update. 2790416161dbSMark Fasheh */ 2791416161dbSMark Fasheh ret = -EINVAL; 2792416161dbSMark Fasheh goto out; 2793416161dbSMark Fasheh } 2794416161dbSMark Fasheh 2795416161dbSMark Fasheh ret = -EISDIR; 2796416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2797416161dbSMark Fasheh goto out; 2798416161dbSMark Fasheh 2799416161dbSMark Fasheh ret = -EACCES; 2800416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2801416161dbSMark Fasheh goto out; 2802416161dbSMark Fasheh 2803cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2804cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2805cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2806cbf8b8caSMark Fasheh same->info[i].status = 0; 2807416161dbSMark Fasheh } 2808416161dbSMark Fasheh 2809cbf8b8caSMark Fasheh ret = 0; 2810cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2811cbf8b8caSMark Fasheh info = &same->info[i]; 2812416161dbSMark Fasheh 2813cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2814416161dbSMark Fasheh if (!dst_file) { 2815cbf8b8caSMark Fasheh info->status = -EBADF; 2816416161dbSMark Fasheh goto next; 2817416161dbSMark Fasheh } 2818416161dbSMark Fasheh 2819416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2820cbf8b8caSMark Fasheh info->status = -EINVAL; 2821416161dbSMark Fasheh goto next; 2822416161dbSMark Fasheh } 2823416161dbSMark Fasheh 2824cbf8b8caSMark Fasheh info->status = -EXDEV; 2825416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2826416161dbSMark Fasheh goto next; 2827416161dbSMark Fasheh 2828416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2829416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2830416161dbSMark Fasheh goto next; 2831416161dbSMark Fasheh 2832416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2833cbf8b8caSMark Fasheh info->status = -EISDIR; 2834416161dbSMark Fasheh goto next; 2835416161dbSMark Fasheh } 2836416161dbSMark Fasheh 2837416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2838cbf8b8caSMark Fasheh info->status = -EACCES; 2839416161dbSMark Fasheh goto next; 2840416161dbSMark Fasheh } 2841416161dbSMark Fasheh 2842cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2843cbf8b8caSMark Fasheh info->logical_offset); 2844cbf8b8caSMark Fasheh if (info->status == 0) 2845cbf8b8caSMark Fasheh info->bytes_deduped += len; 2846416161dbSMark Fasheh 2847416161dbSMark Fasheh next: 2848416161dbSMark Fasheh if (dst_file) 2849416161dbSMark Fasheh fput(dst_file); 2850cbf8b8caSMark Fasheh } 2851416161dbSMark Fasheh 2852cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2853cbf8b8caSMark Fasheh if (ret) 2854416161dbSMark Fasheh ret = -EFAULT; 2855416161dbSMark Fasheh 2856416161dbSMark Fasheh out: 2857416161dbSMark Fasheh mnt_drop_write_file(file); 2858416161dbSMark Fasheh return ret; 2859416161dbSMark Fasheh } 2860416161dbSMark Fasheh 286132b7c687SMark Fasheh /** 286232b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 286332b7c687SMark Fasheh * 286432b7c687SMark Fasheh * @src: Inode to clone from 286532b7c687SMark Fasheh * @inode: Inode to clone to 286632b7c687SMark Fasheh * @off: Offset within source to start clone from 286732b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 286832b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 286932b7c687SMark Fasheh * identical values here 287032b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 287132b7c687SMark Fasheh */ 287232b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 287332b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2874f46b5a66SChristoph Hellwig { 2875f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 287632b7c687SMark Fasheh struct btrfs_path *path = NULL; 2877f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 287832b7c687SMark Fasheh struct btrfs_trans_handle *trans; 287932b7c687SMark Fasheh char *buf = NULL; 2880ae01a0abSYan Zheng struct btrfs_key key; 2881f46b5a66SChristoph Hellwig u32 nritems; 2882f46b5a66SChristoph Hellwig int slot; 2883ae01a0abSYan Zheng int ret; 288432b7c687SMark Fasheh u64 len = olen_aligned; 2885ae01a0abSYan Zheng 2886ae01a0abSYan Zheng ret = -ENOMEM; 2887ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2888ae01a0abSYan Zheng if (!buf) 288932b7c687SMark Fasheh return ret; 2890ae01a0abSYan Zheng 2891ae01a0abSYan Zheng path = btrfs_alloc_path(); 2892ae01a0abSYan Zheng if (!path) { 2893ae01a0abSYan Zheng vfree(buf); 289432b7c687SMark Fasheh return ret; 2895ae01a0abSYan Zheng } 289632b7c687SMark Fasheh 2897ae01a0abSYan Zheng path->reada = 2; 2898c5c9cd4dSSage Weil /* clone data */ 289933345d01SLi Zefan key.objectid = btrfs_ino(src); 2900ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2901ae01a0abSYan Zheng key.offset = 0; 2902f46b5a66SChristoph Hellwig 2903f46b5a66SChristoph Hellwig while (1) { 2904f46b5a66SChristoph Hellwig /* 2905f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2906f46b5a66SChristoph Hellwig * tree. 2907f46b5a66SChristoph Hellwig */ 2908362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2909362a20c5SDavid Sterba 0, 0); 2910f46b5a66SChristoph Hellwig if (ret < 0) 2911f46b5a66SChristoph Hellwig goto out; 2912f46b5a66SChristoph Hellwig 2913ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2914ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2915362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2916f46b5a66SChristoph Hellwig if (ret < 0) 2917f46b5a66SChristoph Hellwig goto out; 2918f46b5a66SChristoph Hellwig if (ret > 0) 2919f46b5a66SChristoph Hellwig break; 2920ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2921f46b5a66SChristoph Hellwig } 2922f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2923f46b5a66SChristoph Hellwig slot = path->slots[0]; 2924f46b5a66SChristoph Hellwig 2925ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2926d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 292733345d01SLi Zefan key.objectid != btrfs_ino(src)) 2928f46b5a66SChristoph Hellwig break; 2929f46b5a66SChristoph Hellwig 2930c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2931c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2932c5c9cd4dSSage Weil int type; 293331840ae1SZheng Yan u32 size; 293431840ae1SZheng Yan struct btrfs_key new_key; 2935c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2936c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2937c5c9cd4dSSage Weil u8 comp; 2938b5384d48SSage Weil u64 endoff; 293931840ae1SZheng Yan 294031840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 294131840ae1SZheng Yan read_extent_buffer(leaf, buf, 294231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 294331840ae1SZheng Yan size); 2944c5c9cd4dSSage Weil 2945c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2946c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2947c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2948c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2949c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2950c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2951d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2952d397712bSChris Mason extent); 2953d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2954d397712bSChris Mason extent); 2955c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2956d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2957d397712bSChris Mason extent); 2958c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2959c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2960c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2961c5c9cd4dSSage Weil extent); 2962c5c9cd4dSSage Weil } 2963b3b4aa74SDavid Sterba btrfs_release_path(path); 296431840ae1SZheng Yan 2965050006a7SSage Weil if (key.offset + datal <= off || 2966aa42ffd9SLiu Bo key.offset >= off + len - 1) 2967c5c9cd4dSSage Weil goto next; 2968c5c9cd4dSSage Weil 296931840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 297033345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 29714d728ec7SLi Zefan if (off <= key.offset) 2972c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 29734d728ec7SLi Zefan else 29744d728ec7SLi Zefan new_key.offset = destoff; 2975c5c9cd4dSSage Weil 2976b6f3409bSSage Weil /* 2977b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2978b6f3409bSSage Weil * 1 - add new extent 2979b6f3409bSSage Weil * 1 - inode update 2980b6f3409bSSage Weil */ 2981b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2982a22285a6SYan, Zheng if (IS_ERR(trans)) { 2983a22285a6SYan, Zheng ret = PTR_ERR(trans); 2984a22285a6SYan, Zheng goto out; 2985a22285a6SYan, Zheng } 2986a22285a6SYan, Zheng 2987c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2988c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2989d72c0842SLi Zefan /* 2990d72c0842SLi Zefan * a | --- range to clone ---| b 2991d72c0842SLi Zefan * | ------------- extent ------------- | 2992d72c0842SLi Zefan */ 2993d72c0842SLi Zefan 2994d72c0842SLi Zefan /* substract range b */ 2995d72c0842SLi Zefan if (key.offset + datal > off + len) 2996d72c0842SLi Zefan datal = off + len - key.offset; 2997d72c0842SLi Zefan 2998d72c0842SLi Zefan /* substract range a */ 2999a22285a6SYan, Zheng if (off > key.offset) { 3000a22285a6SYan, Zheng datao += off - key.offset; 3001a22285a6SYan, Zheng datal -= off - key.offset; 3002a22285a6SYan, Zheng } 3003a22285a6SYan, Zheng 30045dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3005a22285a6SYan, Zheng new_key.offset, 3006a22285a6SYan, Zheng new_key.offset + datal, 30072671485dSJosef Bacik 1); 300879787eaaSJeff Mahoney if (ret) { 300979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 301079787eaaSJeff Mahoney ret); 301179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 301279787eaaSJeff Mahoney goto out; 301379787eaaSJeff Mahoney } 3014a22285a6SYan, Zheng 301531840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 301631840ae1SZheng Yan &new_key, size); 301779787eaaSJeff Mahoney if (ret) { 301879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 301979787eaaSJeff Mahoney ret); 302079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 302179787eaaSJeff Mahoney goto out; 302279787eaaSJeff Mahoney } 302331840ae1SZheng Yan 302431840ae1SZheng Yan leaf = path->nodes[0]; 302531840ae1SZheng Yan slot = path->slots[0]; 302631840ae1SZheng Yan write_extent_buffer(leaf, buf, 302731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 302831840ae1SZheng Yan size); 3029ae01a0abSYan Zheng 3030f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3031f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3032c5c9cd4dSSage Weil 3033c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3034c5c9cd4dSSage Weil if (!disko) 3035c5c9cd4dSSage Weil datao = 0; 3036c5c9cd4dSSage Weil 3037c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3038c5c9cd4dSSage Weil datao); 3039c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3040c5c9cd4dSSage Weil datal); 3041c5c9cd4dSSage Weil if (disko) { 3042c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3043ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 30445d4f98a2SYan Zheng disko, diskl, 0, 3045f46b5a66SChristoph Hellwig root->root_key.objectid, 304633345d01SLi Zefan btrfs_ino(inode), 304766d7e7f0SArne Jansen new_key.offset - datao, 304866d7e7f0SArne Jansen 0); 304979787eaaSJeff Mahoney if (ret) { 305079787eaaSJeff Mahoney btrfs_abort_transaction(trans, 305179787eaaSJeff Mahoney root, 305279787eaaSJeff Mahoney ret); 305379787eaaSJeff Mahoney btrfs_end_transaction(trans, 305479787eaaSJeff Mahoney root); 305579787eaaSJeff Mahoney goto out; 305679787eaaSJeff Mahoney 305779787eaaSJeff Mahoney } 3058f46b5a66SChristoph Hellwig } 3059c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3060c5c9cd4dSSage Weil u64 skip = 0; 3061c5c9cd4dSSage Weil u64 trim = 0; 3062c5c9cd4dSSage Weil if (off > key.offset) { 3063c5c9cd4dSSage Weil skip = off - key.offset; 3064c5c9cd4dSSage Weil new_key.offset += skip; 306531840ae1SZheng Yan } 3066d397712bSChris Mason 3067c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3068c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3069d397712bSChris Mason 3070c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3071c5c9cd4dSSage Weil ret = -EINVAL; 3072a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3073c5c9cd4dSSage Weil goto out; 307431840ae1SZheng Yan } 3075c5c9cd4dSSage Weil size -= skip + trim; 3076c5c9cd4dSSage Weil datal -= skip + trim; 3077a22285a6SYan, Zheng 30785dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3079a22285a6SYan, Zheng new_key.offset, 3080a22285a6SYan, Zheng new_key.offset + datal, 30812671485dSJosef Bacik 1); 308279787eaaSJeff Mahoney if (ret) { 308379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 308479787eaaSJeff Mahoney ret); 308579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 308679787eaaSJeff Mahoney goto out; 308779787eaaSJeff Mahoney } 3088a22285a6SYan, Zheng 3089c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3090c5c9cd4dSSage Weil &new_key, size); 309179787eaaSJeff Mahoney if (ret) { 309279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 309379787eaaSJeff Mahoney ret); 309479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 309579787eaaSJeff Mahoney goto out; 309679787eaaSJeff Mahoney } 3097c5c9cd4dSSage Weil 3098c5c9cd4dSSage Weil if (skip) { 3099d397712bSChris Mason u32 start = 3100d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3101c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3102c5c9cd4dSSage Weil datal); 3103c5c9cd4dSSage Weil } 3104c5c9cd4dSSage Weil 3105c5c9cd4dSSage Weil leaf = path->nodes[0]; 3106c5c9cd4dSSage Weil slot = path->slots[0]; 3107c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3108c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3109c5c9cd4dSSage Weil size); 3110c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3111c5c9cd4dSSage Weil } 3112c5c9cd4dSSage Weil 3113c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3114b3b4aa74SDavid Sterba btrfs_release_path(path); 3115c5c9cd4dSSage Weil 31160c4d2d95SJosef Bacik inode_inc_iversion(inode); 3117a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3118b5384d48SSage Weil 3119b5384d48SSage Weil /* 3120b5384d48SSage Weil * we round up to the block size at eof when 3121b5384d48SSage Weil * determining which extents to clone above, 3122b5384d48SSage Weil * but shouldn't round up the file size 3123b5384d48SSage Weil */ 3124b5384d48SSage Weil endoff = new_key.offset + datal; 31255f3888ffSLi Zefan if (endoff > destoff+olen) 31265f3888ffSLi Zefan endoff = destoff+olen; 3127b5384d48SSage Weil if (endoff > inode->i_size) 3128b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3129b5384d48SSage Weil 3130a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 313179787eaaSJeff Mahoney if (ret) { 313279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3133a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 313479787eaaSJeff Mahoney goto out; 313579787eaaSJeff Mahoney } 313679787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3137a22285a6SYan, Zheng } 3138c5c9cd4dSSage Weil next: 3139b3b4aa74SDavid Sterba btrfs_release_path(path); 3140ae01a0abSYan Zheng key.offset++; 3141ae01a0abSYan Zheng } 3142f46b5a66SChristoph Hellwig ret = 0; 314332b7c687SMark Fasheh 3144f46b5a66SChristoph Hellwig out: 3145b3b4aa74SDavid Sterba btrfs_release_path(path); 314632b7c687SMark Fasheh btrfs_free_path(path); 314732b7c687SMark Fasheh vfree(buf); 314832b7c687SMark Fasheh return ret; 314932b7c687SMark Fasheh } 315032b7c687SMark Fasheh 315132b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 315232b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 315332b7c687SMark Fasheh { 315454563d41SAl Viro struct inode *inode = file_inode(file); 315532b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 315632b7c687SMark Fasheh struct fd src_file; 315732b7c687SMark Fasheh struct inode *src; 315832b7c687SMark Fasheh int ret; 315932b7c687SMark Fasheh u64 len = olen; 316032b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 316132b7c687SMark Fasheh int same_inode = 0; 316232b7c687SMark Fasheh 316332b7c687SMark Fasheh /* 316432b7c687SMark Fasheh * TODO: 316532b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 316632b7c687SMark Fasheh * decompress into destination's address_space (the file offset 316732b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 316832b7c687SMark Fasheh * otherwise reinsert) a subrange. 316932b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 317032b7c687SMark Fasheh * they don't overlap)? 317132b7c687SMark Fasheh */ 317232b7c687SMark Fasheh 317332b7c687SMark Fasheh /* the destination must be opened for writing */ 317432b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 317532b7c687SMark Fasheh return -EINVAL; 317632b7c687SMark Fasheh 317732b7c687SMark Fasheh if (btrfs_root_readonly(root)) 317832b7c687SMark Fasheh return -EROFS; 317932b7c687SMark Fasheh 318032b7c687SMark Fasheh ret = mnt_want_write_file(file); 318132b7c687SMark Fasheh if (ret) 318232b7c687SMark Fasheh return ret; 318332b7c687SMark Fasheh 318432b7c687SMark Fasheh src_file = fdget(srcfd); 318532b7c687SMark Fasheh if (!src_file.file) { 318632b7c687SMark Fasheh ret = -EBADF; 318732b7c687SMark Fasheh goto out_drop_write; 318832b7c687SMark Fasheh } 318932b7c687SMark Fasheh 319032b7c687SMark Fasheh ret = -EXDEV; 319132b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 319232b7c687SMark Fasheh goto out_fput; 319332b7c687SMark Fasheh 319432b7c687SMark Fasheh src = file_inode(src_file.file); 319532b7c687SMark Fasheh 319632b7c687SMark Fasheh ret = -EINVAL; 319732b7c687SMark Fasheh if (src == inode) 319832b7c687SMark Fasheh same_inode = 1; 319932b7c687SMark Fasheh 320032b7c687SMark Fasheh /* the src must be open for reading */ 320132b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 320232b7c687SMark Fasheh goto out_fput; 320332b7c687SMark Fasheh 320432b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 320532b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 320632b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 320732b7c687SMark Fasheh goto out_fput; 320832b7c687SMark Fasheh 320932b7c687SMark Fasheh ret = -EISDIR; 321032b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 321132b7c687SMark Fasheh goto out_fput; 321232b7c687SMark Fasheh 321332b7c687SMark Fasheh ret = -EXDEV; 321432b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 321532b7c687SMark Fasheh goto out_fput; 321632b7c687SMark Fasheh 321732b7c687SMark Fasheh if (!same_inode) { 321832b7c687SMark Fasheh if (inode < src) { 321932b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 322032b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 322132b7c687SMark Fasheh } else { 322232b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 322332b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 322432b7c687SMark Fasheh } 322532b7c687SMark Fasheh } else { 322632b7c687SMark Fasheh mutex_lock(&src->i_mutex); 322732b7c687SMark Fasheh } 322832b7c687SMark Fasheh 322932b7c687SMark Fasheh /* determine range to clone */ 323032b7c687SMark Fasheh ret = -EINVAL; 323132b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 323232b7c687SMark Fasheh goto out_unlock; 323332b7c687SMark Fasheh if (len == 0) 323432b7c687SMark Fasheh olen = len = src->i_size - off; 323532b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 323632b7c687SMark Fasheh if (off + len == src->i_size) 323732b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 323832b7c687SMark Fasheh 323932b7c687SMark Fasheh /* verify the end result is block aligned */ 324032b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 324132b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 324232b7c687SMark Fasheh goto out_unlock; 324332b7c687SMark Fasheh 324432b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 324532b7c687SMark Fasheh if (same_inode) { 324632b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 324732b7c687SMark Fasheh goto out_unlock; 324832b7c687SMark Fasheh } 324932b7c687SMark Fasheh 325032b7c687SMark Fasheh if (destoff > inode->i_size) { 325132b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 325232b7c687SMark Fasheh if (ret) 325332b7c687SMark Fasheh goto out_unlock; 325432b7c687SMark Fasheh } 325532b7c687SMark Fasheh 325632b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 325732b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 325832b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 325932b7c687SMark Fasheh 326032b7c687SMark Fasheh lock_extent_range(src, off, len); 326132b7c687SMark Fasheh 326232b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 326332b7c687SMark Fasheh 3264aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3265f46b5a66SChristoph Hellwig out_unlock: 3266f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3267a96fbc72SLiu Bo if (!same_inode) 3268f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3269f46b5a66SChristoph Hellwig out_fput: 32702903ff01SAl Viro fdput(src_file); 3271ab67b7c1SYan Zheng out_drop_write: 32722a79f17eSAl Viro mnt_drop_write_file(file); 3273f46b5a66SChristoph Hellwig return ret; 3274f46b5a66SChristoph Hellwig } 3275f46b5a66SChristoph Hellwig 32767a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3277c5c9cd4dSSage Weil { 3278c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3279c5c9cd4dSSage Weil 32807a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3281c5c9cd4dSSage Weil return -EFAULT; 3282c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3283c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3284c5c9cd4dSSage Weil } 3285c5c9cd4dSSage Weil 3286f46b5a66SChristoph Hellwig /* 3287f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3288f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3289f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3290f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3291f46b5a66SChristoph Hellwig */ 3292b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3293f46b5a66SChristoph Hellwig { 3294496ad9aaSAl Viro struct inode *inode = file_inode(file); 3295f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3296f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 32971ab86aedSSage Weil int ret; 3298f46b5a66SChristoph Hellwig 32991ab86aedSSage Weil ret = -EPERM; 3300df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3301f46b5a66SChristoph Hellwig goto out; 33021ab86aedSSage Weil 33031ab86aedSSage Weil ret = -EINPROGRESS; 33041ab86aedSSage Weil if (file->private_data) 33051ab86aedSSage Weil goto out; 33069ca9ee09SSage Weil 3307b83cc969SLi Zefan ret = -EROFS; 3308b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3309b83cc969SLi Zefan goto out; 3310b83cc969SLi Zefan 3311a561be71SAl Viro ret = mnt_want_write_file(file); 3312c146afadSYan Zheng if (ret) 3313c146afadSYan Zheng goto out; 3314c146afadSYan Zheng 3315a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 33169ca9ee09SSage Weil 3317f46b5a66SChristoph Hellwig ret = -ENOMEM; 33187a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3319abd30bb0STsutomu Itoh if (IS_ERR(trans)) 33201ab86aedSSage Weil goto out_drop; 33211ab86aedSSage Weil 33221ab86aedSSage Weil file->private_data = trans; 33231ab86aedSSage Weil return 0; 33241ab86aedSSage Weil 33251ab86aedSSage Weil out_drop: 3326a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 33272a79f17eSAl Viro mnt_drop_write_file(file); 3328f46b5a66SChristoph Hellwig out: 3329f46b5a66SChristoph Hellwig return ret; 3330f46b5a66SChristoph Hellwig } 3331f46b5a66SChristoph Hellwig 33326ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33336ef5ed0dSJosef Bacik { 3334496ad9aaSAl Viro struct inode *inode = file_inode(file); 33356ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33366ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33376ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33386ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33396ef5ed0dSJosef Bacik struct btrfs_path *path; 33406ef5ed0dSJosef Bacik struct btrfs_key location; 33416ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33426ef5ed0dSJosef Bacik u64 objectid = 0; 33436ef5ed0dSJosef Bacik u64 dir_id; 33443c04ce01SMiao Xie int ret; 33456ef5ed0dSJosef Bacik 33466ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33476ef5ed0dSJosef Bacik return -EPERM; 33486ef5ed0dSJosef Bacik 33493c04ce01SMiao Xie ret = mnt_want_write_file(file); 33503c04ce01SMiao Xie if (ret) 33513c04ce01SMiao Xie return ret; 33523c04ce01SMiao Xie 33533c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33543c04ce01SMiao Xie ret = -EFAULT; 33553c04ce01SMiao Xie goto out; 33563c04ce01SMiao Xie } 33576ef5ed0dSJosef Bacik 33586ef5ed0dSJosef Bacik if (!objectid) 33591cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33606ef5ed0dSJosef Bacik 33616ef5ed0dSJosef Bacik location.objectid = objectid; 33626ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33636ef5ed0dSJosef Bacik location.offset = (u64)-1; 33646ef5ed0dSJosef Bacik 33656ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 33663c04ce01SMiao Xie if (IS_ERR(new_root)) { 33673c04ce01SMiao Xie ret = PTR_ERR(new_root); 33683c04ce01SMiao Xie goto out; 33693c04ce01SMiao Xie } 33706ef5ed0dSJosef Bacik 33716ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33723c04ce01SMiao Xie if (!path) { 33733c04ce01SMiao Xie ret = -ENOMEM; 33743c04ce01SMiao Xie goto out; 33753c04ce01SMiao Xie } 33766ef5ed0dSJosef Bacik path->leave_spinning = 1; 33776ef5ed0dSJosef Bacik 33786ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 337998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33806ef5ed0dSJosef Bacik btrfs_free_path(path); 33813c04ce01SMiao Xie ret = PTR_ERR(trans); 33823c04ce01SMiao Xie goto out; 33836ef5ed0dSJosef Bacik } 33846ef5ed0dSJosef Bacik 33856c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 33866ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 33876ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3388cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33896ef5ed0dSJosef Bacik btrfs_free_path(path); 33906ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3391efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3392efe120a0SFrank Holton "item, this isn't going to work"); 33933c04ce01SMiao Xie ret = -ENOENT; 33943c04ce01SMiao Xie goto out; 33956ef5ed0dSJosef Bacik } 33966ef5ed0dSJosef Bacik 33976ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33986ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33996ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34006ef5ed0dSJosef Bacik btrfs_free_path(path); 34016ef5ed0dSJosef Bacik 34022b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 34036ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 34043c04ce01SMiao Xie out: 34053c04ce01SMiao Xie mnt_drop_write_file(file); 34063c04ce01SMiao Xie return ret; 34076ef5ed0dSJosef Bacik } 34086ef5ed0dSJosef Bacik 34095af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3410bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3411bf5fc093SJosef Bacik { 3412bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3413bf5fc093SJosef Bacik 3414bf5fc093SJosef Bacik space->total_bytes = 0; 3415bf5fc093SJosef Bacik space->used_bytes = 0; 3416bf5fc093SJosef Bacik space->flags = 0; 3417bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3418bf5fc093SJosef Bacik space->flags = block_group->flags; 3419bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3420bf5fc093SJosef Bacik space->used_bytes += 3421bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3422bf5fc093SJosef Bacik } 3423bf5fc093SJosef Bacik } 3424bf5fc093SJosef Bacik 342548a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 34261406e432SJosef Bacik { 34271406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34281406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34291406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34307fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 343113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34321406e432SJosef Bacik struct btrfs_space_info *info; 3433bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3434bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3435bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3436bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3437bf5fc093SJosef Bacik int num_types = 4; 34387fde62bfSChris Mason int alloc_size; 34391406e432SJosef Bacik int ret = 0; 344051788b1bSDan Rosenberg u64 slot_count = 0; 3441bf5fc093SJosef Bacik int i, c; 34421406e432SJosef Bacik 34431406e432SJosef Bacik if (copy_from_user(&space_args, 34441406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34451406e432SJosef Bacik sizeof(space_args))) 34461406e432SJosef Bacik return -EFAULT; 34471406e432SJosef Bacik 3448bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3449bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3450bf5fc093SJosef Bacik 3451bf5fc093SJosef Bacik info = NULL; 34527fde62bfSChris Mason rcu_read_lock(); 3453bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3454bf5fc093SJosef Bacik list) { 3455bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3456bf5fc093SJosef Bacik info = tmp; 3457bf5fc093SJosef Bacik break; 3458bf5fc093SJosef Bacik } 3459bf5fc093SJosef Bacik } 34607fde62bfSChris Mason rcu_read_unlock(); 34611406e432SJosef Bacik 3462bf5fc093SJosef Bacik if (!info) 3463bf5fc093SJosef Bacik continue; 3464bf5fc093SJosef Bacik 3465bf5fc093SJosef Bacik down_read(&info->groups_sem); 3466bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3467bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3468bf5fc093SJosef Bacik slot_count++; 3469bf5fc093SJosef Bacik } 3470bf5fc093SJosef Bacik up_read(&info->groups_sem); 3471bf5fc093SJosef Bacik } 3472bf5fc093SJosef Bacik 34737fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34747fde62bfSChris Mason if (space_args.space_slots == 0) { 34757fde62bfSChris Mason space_args.total_spaces = slot_count; 34767fde62bfSChris Mason goto out; 34777fde62bfSChris Mason } 3478bf5fc093SJosef Bacik 347951788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3480bf5fc093SJosef Bacik 34817fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3482bf5fc093SJosef Bacik 34837fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34847fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34857fde62bfSChris Mason */ 34867fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 34877fde62bfSChris Mason return -ENOMEM; 34887fde62bfSChris Mason 34897fde62bfSChris Mason space_args.total_spaces = 0; 34907fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 34917fde62bfSChris Mason if (!dest) 34927fde62bfSChris Mason return -ENOMEM; 34937fde62bfSChris Mason dest_orig = dest; 34947fde62bfSChris Mason 34957fde62bfSChris Mason /* now we have a buffer to copy into */ 3496bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3497bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3498bf5fc093SJosef Bacik 349951788b1bSDan Rosenberg if (!slot_count) 350051788b1bSDan Rosenberg break; 350151788b1bSDan Rosenberg 3502bf5fc093SJosef Bacik info = NULL; 35031406e432SJosef Bacik rcu_read_lock(); 3504bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3505bf5fc093SJosef Bacik list) { 3506bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3507bf5fc093SJosef Bacik info = tmp; 35087fde62bfSChris Mason break; 3509bf5fc093SJosef Bacik } 3510bf5fc093SJosef Bacik } 3511bf5fc093SJosef Bacik rcu_read_unlock(); 35127fde62bfSChris Mason 3513bf5fc093SJosef Bacik if (!info) 3514bf5fc093SJosef Bacik continue; 3515bf5fc093SJosef Bacik down_read(&info->groups_sem); 3516bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3517bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 35185af3e8ccSStefan Behrens btrfs_get_block_group_info( 35195af3e8ccSStefan Behrens &info->block_groups[c], &space); 35207fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35211406e432SJosef Bacik dest++; 35221406e432SJosef Bacik space_args.total_spaces++; 352351788b1bSDan Rosenberg slot_count--; 35241406e432SJosef Bacik } 352551788b1bSDan Rosenberg if (!slot_count) 352651788b1bSDan Rosenberg break; 3527bf5fc093SJosef Bacik } 3528bf5fc093SJosef Bacik up_read(&info->groups_sem); 3529bf5fc093SJosef Bacik } 35301406e432SJosef Bacik 35312eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35327fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35337fde62bfSChris Mason 35347fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35357fde62bfSChris Mason ret = -EFAULT; 35367fde62bfSChris Mason 35377fde62bfSChris Mason kfree(dest_orig); 35387fde62bfSChris Mason out: 35397fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35401406e432SJosef Bacik ret = -EFAULT; 35411406e432SJosef Bacik 35421406e432SJosef Bacik return ret; 35431406e432SJosef Bacik } 35441406e432SJosef Bacik 354501e219e8SJeff Mahoney static long btrfs_ioctl_global_rsv(struct btrfs_root *root, void __user *arg) 354601e219e8SJeff Mahoney { 354701e219e8SJeff Mahoney struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 354801e219e8SJeff Mahoney u64 reserved; 354901e219e8SJeff Mahoney 355001e219e8SJeff Mahoney spin_lock(&block_rsv->lock); 355101e219e8SJeff Mahoney reserved = block_rsv->reserved; 355201e219e8SJeff Mahoney spin_unlock(&block_rsv->lock); 355301e219e8SJeff Mahoney 355401e219e8SJeff Mahoney if (arg && copy_to_user(arg, &reserved, sizeof(reserved))) 355501e219e8SJeff Mahoney return -EFAULT; 355601e219e8SJeff Mahoney return 0; 355701e219e8SJeff Mahoney } 355801e219e8SJeff Mahoney 3559f46b5a66SChristoph Hellwig /* 3560f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3561f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3562f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3563f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3564f46b5a66SChristoph Hellwig */ 3565f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3566f46b5a66SChristoph Hellwig { 3567496ad9aaSAl Viro struct inode *inode = file_inode(file); 3568f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3569f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3570f46b5a66SChristoph Hellwig 3571f46b5a66SChristoph Hellwig trans = file->private_data; 35721ab86aedSSage Weil if (!trans) 35731ab86aedSSage Weil return -EINVAL; 3574b214107eSChristoph Hellwig file->private_data = NULL; 35759ca9ee09SSage Weil 35761ab86aedSSage Weil btrfs_end_transaction(trans, root); 35771ab86aedSSage Weil 3578a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 35799ca9ee09SSage Weil 35802a79f17eSAl Viro mnt_drop_write_file(file); 35811ab86aedSSage Weil return 0; 3582f46b5a66SChristoph Hellwig } 3583f46b5a66SChristoph Hellwig 35849a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35859a8c28beSMiao Xie void __user *argp) 358646204592SSage Weil { 358746204592SSage Weil struct btrfs_trans_handle *trans; 358846204592SSage Weil u64 transid; 3589db5b493aSTsutomu Itoh int ret; 359046204592SSage Weil 3591d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3592ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3593ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 359498d5dc13STsutomu Itoh return PTR_ERR(trans); 3595ff7c1d33SMiao Xie 3596ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3597ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3598ff7c1d33SMiao Xie goto out; 3599ff7c1d33SMiao Xie } 360046204592SSage Weil transid = trans->transid; 3601db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 36028b2b2d3cSTsutomu Itoh if (ret) { 36038b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3604db5b493aSTsutomu Itoh return ret; 36058b2b2d3cSTsutomu Itoh } 3606ff7c1d33SMiao Xie out: 360746204592SSage Weil if (argp) 360846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 360946204592SSage Weil return -EFAULT; 361046204592SSage Weil return 0; 361146204592SSage Weil } 361246204592SSage Weil 36139a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 36149a8c28beSMiao Xie void __user *argp) 361546204592SSage Weil { 361646204592SSage Weil u64 transid; 361746204592SSage Weil 361846204592SSage Weil if (argp) { 361946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 362046204592SSage Weil return -EFAULT; 362146204592SSage Weil } else { 362246204592SSage Weil transid = 0; /* current trans */ 362346204592SSage Weil } 362446204592SSage Weil return btrfs_wait_for_commit(root, transid); 362546204592SSage Weil } 362646204592SSage Weil 3627b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3628475f6387SJan Schmidt { 3629496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3630475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3631b8e95489SMiao Xie int ret; 3632475f6387SJan Schmidt 3633475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3634475f6387SJan Schmidt return -EPERM; 3635475f6387SJan Schmidt 3636475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3637475f6387SJan Schmidt if (IS_ERR(sa)) 3638475f6387SJan Schmidt return PTR_ERR(sa); 3639475f6387SJan Schmidt 3640b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3641b8e95489SMiao Xie ret = mnt_want_write_file(file); 3642b8e95489SMiao Xie if (ret) 3643b8e95489SMiao Xie goto out; 3644b8e95489SMiao Xie } 3645b8e95489SMiao Xie 3646aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 364763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 364863a212abSStefan Behrens 0); 3649475f6387SJan Schmidt 3650475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3651475f6387SJan Schmidt ret = -EFAULT; 3652475f6387SJan Schmidt 3653b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3654b8e95489SMiao Xie mnt_drop_write_file(file); 3655b8e95489SMiao Xie out: 3656475f6387SJan Schmidt kfree(sa); 3657475f6387SJan Schmidt return ret; 3658475f6387SJan Schmidt } 3659475f6387SJan Schmidt 3660475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3661475f6387SJan Schmidt { 3662475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3663475f6387SJan Schmidt return -EPERM; 3664475f6387SJan Schmidt 3665aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3666475f6387SJan Schmidt } 3667475f6387SJan Schmidt 3668475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3669475f6387SJan Schmidt void __user *arg) 3670475f6387SJan Schmidt { 3671475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3672475f6387SJan Schmidt int ret; 3673475f6387SJan Schmidt 3674475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3675475f6387SJan Schmidt return -EPERM; 3676475f6387SJan Schmidt 3677475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3678475f6387SJan Schmidt if (IS_ERR(sa)) 3679475f6387SJan Schmidt return PTR_ERR(sa); 3680475f6387SJan Schmidt 3681475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3682475f6387SJan Schmidt 3683475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3684475f6387SJan Schmidt ret = -EFAULT; 3685475f6387SJan Schmidt 3686475f6387SJan Schmidt kfree(sa); 3687475f6387SJan Schmidt return ret; 3688475f6387SJan Schmidt } 3689475f6387SJan Schmidt 3690c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3691b27f7c0cSDavid Sterba void __user *arg) 3692c11d2c23SStefan Behrens { 3693c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3694c11d2c23SStefan Behrens int ret; 3695c11d2c23SStefan Behrens 3696c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3697c11d2c23SStefan Behrens if (IS_ERR(sa)) 3698c11d2c23SStefan Behrens return PTR_ERR(sa); 3699c11d2c23SStefan Behrens 3700b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3701b27f7c0cSDavid Sterba kfree(sa); 3702b27f7c0cSDavid Sterba return -EPERM; 3703b27f7c0cSDavid Sterba } 3704b27f7c0cSDavid Sterba 3705b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3706c11d2c23SStefan Behrens 3707c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3708c11d2c23SStefan Behrens ret = -EFAULT; 3709c11d2c23SStefan Behrens 3710c11d2c23SStefan Behrens kfree(sa); 3711c11d2c23SStefan Behrens return ret; 3712c11d2c23SStefan Behrens } 3713c11d2c23SStefan Behrens 37143f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 37153f6bcfbdSStefan Behrens { 37163f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37173f6bcfbdSStefan Behrens int ret; 37183f6bcfbdSStefan Behrens 37193f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37203f6bcfbdSStefan Behrens return -EPERM; 37213f6bcfbdSStefan Behrens 37223f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37233f6bcfbdSStefan Behrens if (IS_ERR(p)) 37243f6bcfbdSStefan Behrens return PTR_ERR(p); 37253f6bcfbdSStefan Behrens 37263f6bcfbdSStefan Behrens switch (p->cmd) { 37273f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3728adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3729adfa97cbSIlya Dryomov ret = -EROFS; 3730adfa97cbSIlya Dryomov goto out; 3731adfa97cbSIlya Dryomov } 37323f6bcfbdSStefan Behrens if (atomic_xchg( 37333f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 37343f6bcfbdSStefan Behrens 1)) { 3735e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37363f6bcfbdSStefan Behrens } else { 37373f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 37383f6bcfbdSStefan Behrens atomic_set( 37393f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 37403f6bcfbdSStefan Behrens 0); 37413f6bcfbdSStefan Behrens } 37423f6bcfbdSStefan Behrens break; 37433f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37443f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 37453f6bcfbdSStefan Behrens ret = 0; 37463f6bcfbdSStefan Behrens break; 37473f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 37483f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 37493f6bcfbdSStefan Behrens break; 37503f6bcfbdSStefan Behrens default: 37513f6bcfbdSStefan Behrens ret = -EINVAL; 37523f6bcfbdSStefan Behrens break; 37533f6bcfbdSStefan Behrens } 37543f6bcfbdSStefan Behrens 37553f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 37563f6bcfbdSStefan Behrens ret = -EFAULT; 3757adfa97cbSIlya Dryomov out: 37583f6bcfbdSStefan Behrens kfree(p); 37593f6bcfbdSStefan Behrens return ret; 37603f6bcfbdSStefan Behrens } 37613f6bcfbdSStefan Behrens 3762d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3763d7728c96SJan Schmidt { 3764d7728c96SJan Schmidt int ret = 0; 3765d7728c96SJan Schmidt int i; 3766740c3d22SChris Mason u64 rel_ptr; 3767d7728c96SJan Schmidt int size; 3768806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3769d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3770d7728c96SJan Schmidt struct btrfs_path *path; 3771d7728c96SJan Schmidt 377282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3773d7728c96SJan Schmidt return -EPERM; 3774d7728c96SJan Schmidt 3775d7728c96SJan Schmidt path = btrfs_alloc_path(); 3776d7728c96SJan Schmidt if (!path) { 3777d7728c96SJan Schmidt ret = -ENOMEM; 3778d7728c96SJan Schmidt goto out; 3779d7728c96SJan Schmidt } 3780d7728c96SJan Schmidt 3781d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3782d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3783d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3784d7728c96SJan Schmidt ipa = NULL; 3785d7728c96SJan Schmidt goto out; 3786d7728c96SJan Schmidt } 3787d7728c96SJan Schmidt 3788d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3789d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3790d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3791d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3792d7728c96SJan Schmidt ipath = NULL; 3793d7728c96SJan Schmidt goto out; 3794d7728c96SJan Schmidt } 3795d7728c96SJan Schmidt 3796d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3797d7728c96SJan Schmidt if (ret < 0) 3798d7728c96SJan Schmidt goto out; 3799d7728c96SJan Schmidt 3800d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3801745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3802745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3803740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3804d7728c96SJan Schmidt } 3805d7728c96SJan Schmidt 3806745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3807745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3808d7728c96SJan Schmidt if (ret) { 3809d7728c96SJan Schmidt ret = -EFAULT; 3810d7728c96SJan Schmidt goto out; 3811d7728c96SJan Schmidt } 3812d7728c96SJan Schmidt 3813d7728c96SJan Schmidt out: 3814d7728c96SJan Schmidt btrfs_free_path(path); 3815d7728c96SJan Schmidt free_ipath(ipath); 3816d7728c96SJan Schmidt kfree(ipa); 3817d7728c96SJan Schmidt 3818d7728c96SJan Schmidt return ret; 3819d7728c96SJan Schmidt } 3820d7728c96SJan Schmidt 3821d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3822d7728c96SJan Schmidt { 3823d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3824d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3825d7728c96SJan Schmidt 3826d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3827d7728c96SJan Schmidt inodes->bytes_left -= c; 3828d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3829d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3830d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3831d7728c96SJan Schmidt inodes->elem_cnt += 3; 3832d7728c96SJan Schmidt } else { 3833d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3834d7728c96SJan Schmidt inodes->bytes_left = 0; 3835d7728c96SJan Schmidt inodes->elem_missed += 3; 3836d7728c96SJan Schmidt } 3837d7728c96SJan Schmidt 3838d7728c96SJan Schmidt return 0; 3839d7728c96SJan Schmidt } 3840d7728c96SJan Schmidt 3841d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3842d7728c96SJan Schmidt void __user *arg) 3843d7728c96SJan Schmidt { 3844d7728c96SJan Schmidt int ret = 0; 3845d7728c96SJan Schmidt int size; 3846d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3847d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3848d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3849d7728c96SJan Schmidt 3850d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3851d7728c96SJan Schmidt return -EPERM; 3852d7728c96SJan Schmidt 3853d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3854d7728c96SJan Schmidt if (IS_ERR(loi)) { 3855d7728c96SJan Schmidt ret = PTR_ERR(loi); 3856d7728c96SJan Schmidt loi = NULL; 3857d7728c96SJan Schmidt goto out; 3858d7728c96SJan Schmidt } 3859d7728c96SJan Schmidt 3860d7728c96SJan Schmidt path = btrfs_alloc_path(); 3861d7728c96SJan Schmidt if (!path) { 3862d7728c96SJan Schmidt ret = -ENOMEM; 3863d7728c96SJan Schmidt goto out; 3864d7728c96SJan Schmidt } 3865d7728c96SJan Schmidt 3866425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3867d7728c96SJan Schmidt inodes = init_data_container(size); 3868d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3869d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3870d7728c96SJan Schmidt inodes = NULL; 3871d7728c96SJan Schmidt goto out; 3872d7728c96SJan Schmidt } 3873d7728c96SJan Schmidt 3874df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3875df031f07SLiu Bo build_ino_list, inodes); 3876df031f07SLiu Bo if (ret == -EINVAL) 3877d7728c96SJan Schmidt ret = -ENOENT; 3878d7728c96SJan Schmidt if (ret < 0) 3879d7728c96SJan Schmidt goto out; 3880d7728c96SJan Schmidt 3881745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3882745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3883d7728c96SJan Schmidt if (ret) 3884d7728c96SJan Schmidt ret = -EFAULT; 3885d7728c96SJan Schmidt 3886d7728c96SJan Schmidt out: 3887d7728c96SJan Schmidt btrfs_free_path(path); 3888425d17a2SLiu Bo vfree(inodes); 3889d7728c96SJan Schmidt kfree(loi); 3890d7728c96SJan Schmidt 3891d7728c96SJan Schmidt return ret; 3892d7728c96SJan Schmidt } 3893d7728c96SJan Schmidt 389419a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3895c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3896c9e9f97bSIlya Dryomov { 3897c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3898c9e9f97bSIlya Dryomov 3899c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3900c9e9f97bSIlya Dryomov 3901837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3902837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3903837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3904837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3905a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3906a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3907837d5b6eSIlya Dryomov 3908c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3909c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3910c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 391119a39dceSIlya Dryomov 391219a39dceSIlya Dryomov if (lock) { 391319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 391419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 391519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 391619a39dceSIlya Dryomov } else { 391719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 391819a39dceSIlya Dryomov } 3919c9e9f97bSIlya Dryomov } 3920c9e9f97bSIlya Dryomov 39219ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3922c9e9f97bSIlya Dryomov { 3923496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3924c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3925c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3926c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3927ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3928c9e9f97bSIlya Dryomov int ret; 3929c9e9f97bSIlya Dryomov 3930c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3931c9e9f97bSIlya Dryomov return -EPERM; 3932c9e9f97bSIlya Dryomov 3933e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39349ba1f6e4SLiu Bo if (ret) 39359ba1f6e4SLiu Bo return ret; 39369ba1f6e4SLiu Bo 3937ed0fb78fSIlya Dryomov again: 3938ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3939c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3940c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3941ed0fb78fSIlya Dryomov need_unlock = true; 3942ed0fb78fSIlya Dryomov goto locked; 3943ed0fb78fSIlya Dryomov } 3944ed0fb78fSIlya Dryomov 3945ed0fb78fSIlya Dryomov /* 3946ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3947ed0fb78fSIlya Dryomov * (1) some other op is running 3948ed0fb78fSIlya Dryomov * (2) balance is running 3949ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3950ed0fb78fSIlya Dryomov */ 3951ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3952ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3953ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3954ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3955ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3956ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3957ed0fb78fSIlya Dryomov goto again; 3958ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3959ed0fb78fSIlya Dryomov 3960ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3961ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3962ed0fb78fSIlya Dryomov /* this is (3) */ 3963ed0fb78fSIlya Dryomov need_unlock = false; 3964ed0fb78fSIlya Dryomov goto locked; 3965ed0fb78fSIlya Dryomov } 3966ed0fb78fSIlya Dryomov 3967ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3968ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3969ed0fb78fSIlya Dryomov goto again; 3970ed0fb78fSIlya Dryomov } else { 3971ed0fb78fSIlya Dryomov /* this is (2) */ 3972ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3973ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3974ed0fb78fSIlya Dryomov goto out; 3975ed0fb78fSIlya Dryomov } 3976ed0fb78fSIlya Dryomov } else { 3977ed0fb78fSIlya Dryomov /* this is (1) */ 3978ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3979e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3980ed0fb78fSIlya Dryomov goto out; 3981ed0fb78fSIlya Dryomov } 3982ed0fb78fSIlya Dryomov 3983ed0fb78fSIlya Dryomov locked: 3984ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 3985c9e9f97bSIlya Dryomov 3986c9e9f97bSIlya Dryomov if (arg) { 3987c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3988c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3989c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3990ed0fb78fSIlya Dryomov goto out_unlock; 3991c9e9f97bSIlya Dryomov } 3992de322263SIlya Dryomov 3993de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3994de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3995de322263SIlya Dryomov ret = -ENOTCONN; 3996de322263SIlya Dryomov goto out_bargs; 3997de322263SIlya Dryomov } 3998de322263SIlya Dryomov 3999de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4000de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4001de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4002de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4003de322263SIlya Dryomov 4004de322263SIlya Dryomov goto do_balance; 4005de322263SIlya Dryomov } 4006c9e9f97bSIlya Dryomov } else { 4007c9e9f97bSIlya Dryomov bargs = NULL; 4008c9e9f97bSIlya Dryomov } 4009c9e9f97bSIlya Dryomov 4010ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4011837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4012837d5b6eSIlya Dryomov goto out_bargs; 4013837d5b6eSIlya Dryomov } 4014837d5b6eSIlya Dryomov 4015c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4016c9e9f97bSIlya Dryomov if (!bctl) { 4017c9e9f97bSIlya Dryomov ret = -ENOMEM; 4018c9e9f97bSIlya Dryomov goto out_bargs; 4019c9e9f97bSIlya Dryomov } 4020c9e9f97bSIlya Dryomov 4021c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4022c9e9f97bSIlya Dryomov if (arg) { 4023c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4024c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4025c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4026c9e9f97bSIlya Dryomov 4027c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4028f43ffb60SIlya Dryomov } else { 4029f43ffb60SIlya Dryomov /* balance everything - no filters */ 4030f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4031c9e9f97bSIlya Dryomov } 4032c9e9f97bSIlya Dryomov 4033de322263SIlya Dryomov do_balance: 4034c9e9f97bSIlya Dryomov /* 4035ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4036ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4037ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4038ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4039ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4040c9e9f97bSIlya Dryomov */ 4041ed0fb78fSIlya Dryomov need_unlock = false; 4042ed0fb78fSIlya Dryomov 4043ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4044ed0fb78fSIlya Dryomov 4045c9e9f97bSIlya Dryomov if (arg) { 4046c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4047c9e9f97bSIlya Dryomov ret = -EFAULT; 4048c9e9f97bSIlya Dryomov } 4049c9e9f97bSIlya Dryomov 4050c9e9f97bSIlya Dryomov out_bargs: 4051c9e9f97bSIlya Dryomov kfree(bargs); 4052ed0fb78fSIlya Dryomov out_unlock: 4053c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4054c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4055ed0fb78fSIlya Dryomov if (need_unlock) 4056ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4057ed0fb78fSIlya Dryomov out: 4058e54bfa31SLiu Bo mnt_drop_write_file(file); 4059c9e9f97bSIlya Dryomov return ret; 4060c9e9f97bSIlya Dryomov } 4061c9e9f97bSIlya Dryomov 4062837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4063837d5b6eSIlya Dryomov { 4064837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4065837d5b6eSIlya Dryomov return -EPERM; 4066837d5b6eSIlya Dryomov 4067837d5b6eSIlya Dryomov switch (cmd) { 4068837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4069837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4070a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4071a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4072837d5b6eSIlya Dryomov } 4073837d5b6eSIlya Dryomov 4074837d5b6eSIlya Dryomov return -EINVAL; 4075837d5b6eSIlya Dryomov } 4076837d5b6eSIlya Dryomov 407719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 407819a39dceSIlya Dryomov void __user *arg) 407919a39dceSIlya Dryomov { 408019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 408119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 408219a39dceSIlya Dryomov int ret = 0; 408319a39dceSIlya Dryomov 408419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 408519a39dceSIlya Dryomov return -EPERM; 408619a39dceSIlya Dryomov 408719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 408819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 408919a39dceSIlya Dryomov ret = -ENOTCONN; 409019a39dceSIlya Dryomov goto out; 409119a39dceSIlya Dryomov } 409219a39dceSIlya Dryomov 409319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 409419a39dceSIlya Dryomov if (!bargs) { 409519a39dceSIlya Dryomov ret = -ENOMEM; 409619a39dceSIlya Dryomov goto out; 409719a39dceSIlya Dryomov } 409819a39dceSIlya Dryomov 409919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 410019a39dceSIlya Dryomov 410119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 410219a39dceSIlya Dryomov ret = -EFAULT; 410319a39dceSIlya Dryomov 410419a39dceSIlya Dryomov kfree(bargs); 410519a39dceSIlya Dryomov out: 410619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 410719a39dceSIlya Dryomov return ret; 410819a39dceSIlya Dryomov } 410919a39dceSIlya Dryomov 4110905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41115d13a37bSArne Jansen { 4112496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41135d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41145d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 41155d13a37bSArne Jansen int ret; 41165d13a37bSArne Jansen int err; 41175d13a37bSArne Jansen 41185d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41195d13a37bSArne Jansen return -EPERM; 41205d13a37bSArne Jansen 4121905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4122905b0ddaSMiao Xie if (ret) 4123905b0ddaSMiao Xie return ret; 41245d13a37bSArne Jansen 41255d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4126905b0ddaSMiao Xie if (IS_ERR(sa)) { 4127905b0ddaSMiao Xie ret = PTR_ERR(sa); 4128905b0ddaSMiao Xie goto drop_write; 4129905b0ddaSMiao Xie } 41305d13a37bSArne Jansen 41317708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 413292f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 41335d13a37bSArne Jansen if (IS_ERR(trans)) { 41345d13a37bSArne Jansen ret = PTR_ERR(trans); 41355d13a37bSArne Jansen goto out; 41365d13a37bSArne Jansen } 41375d13a37bSArne Jansen 41385d13a37bSArne Jansen switch (sa->cmd) { 41395d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 41405d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 41415d13a37bSArne Jansen break; 41425d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 41435d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 41445d13a37bSArne Jansen break; 41455d13a37bSArne Jansen default: 41465d13a37bSArne Jansen ret = -EINVAL; 41475d13a37bSArne Jansen break; 41485d13a37bSArne Jansen } 41495d13a37bSArne Jansen 415092f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 41515d13a37bSArne Jansen if (err && !ret) 41525d13a37bSArne Jansen ret = err; 41535d13a37bSArne Jansen out: 41545d13a37bSArne Jansen kfree(sa); 41557708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4156905b0ddaSMiao Xie drop_write: 4157905b0ddaSMiao Xie mnt_drop_write_file(file); 41585d13a37bSArne Jansen return ret; 41595d13a37bSArne Jansen } 41605d13a37bSArne Jansen 4161905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41625d13a37bSArne Jansen { 4163496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41645d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41655d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41665d13a37bSArne Jansen int ret; 41675d13a37bSArne Jansen int err; 41685d13a37bSArne Jansen 41695d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41705d13a37bSArne Jansen return -EPERM; 41715d13a37bSArne Jansen 4172905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4173905b0ddaSMiao Xie if (ret) 4174905b0ddaSMiao Xie return ret; 41755d13a37bSArne Jansen 41765d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4177905b0ddaSMiao Xie if (IS_ERR(sa)) { 4178905b0ddaSMiao Xie ret = PTR_ERR(sa); 4179905b0ddaSMiao Xie goto drop_write; 4180905b0ddaSMiao Xie } 41815d13a37bSArne Jansen 41825d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41835d13a37bSArne Jansen if (IS_ERR(trans)) { 41845d13a37bSArne Jansen ret = PTR_ERR(trans); 41855d13a37bSArne Jansen goto out; 41865d13a37bSArne Jansen } 41875d13a37bSArne Jansen 41885d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 41895d13a37bSArne Jansen if (sa->assign) { 41905d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 41915d13a37bSArne Jansen sa->src, sa->dst); 41925d13a37bSArne Jansen } else { 41935d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 41945d13a37bSArne Jansen sa->src, sa->dst); 41955d13a37bSArne Jansen } 41965d13a37bSArne Jansen 41975d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 41985d13a37bSArne Jansen if (err && !ret) 41995d13a37bSArne Jansen ret = err; 42005d13a37bSArne Jansen 42015d13a37bSArne Jansen out: 42025d13a37bSArne Jansen kfree(sa); 4203905b0ddaSMiao Xie drop_write: 4204905b0ddaSMiao Xie mnt_drop_write_file(file); 42055d13a37bSArne Jansen return ret; 42065d13a37bSArne Jansen } 42075d13a37bSArne Jansen 4208905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42095d13a37bSArne Jansen { 4210496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42115d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42125d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42135d13a37bSArne Jansen int ret; 42145d13a37bSArne Jansen int err; 42155d13a37bSArne Jansen 42165d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42175d13a37bSArne Jansen return -EPERM; 42185d13a37bSArne Jansen 4219905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4220905b0ddaSMiao Xie if (ret) 4221905b0ddaSMiao Xie return ret; 42225d13a37bSArne Jansen 42235d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4224905b0ddaSMiao Xie if (IS_ERR(sa)) { 4225905b0ddaSMiao Xie ret = PTR_ERR(sa); 4226905b0ddaSMiao Xie goto drop_write; 4227905b0ddaSMiao Xie } 42285d13a37bSArne Jansen 4229d86e56cfSMiao Xie if (!sa->qgroupid) { 4230d86e56cfSMiao Xie ret = -EINVAL; 4231d86e56cfSMiao Xie goto out; 4232d86e56cfSMiao Xie } 4233d86e56cfSMiao Xie 42345d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42355d13a37bSArne Jansen if (IS_ERR(trans)) { 42365d13a37bSArne Jansen ret = PTR_ERR(trans); 42375d13a37bSArne Jansen goto out; 42385d13a37bSArne Jansen } 42395d13a37bSArne Jansen 42405d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42415d13a37bSArne Jansen if (sa->create) { 42425d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 42435d13a37bSArne Jansen NULL); 42445d13a37bSArne Jansen } else { 42455d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 42465d13a37bSArne Jansen } 42475d13a37bSArne Jansen 42485d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42495d13a37bSArne Jansen if (err && !ret) 42505d13a37bSArne Jansen ret = err; 42515d13a37bSArne Jansen 42525d13a37bSArne Jansen out: 42535d13a37bSArne Jansen kfree(sa); 4254905b0ddaSMiao Xie drop_write: 4255905b0ddaSMiao Xie mnt_drop_write_file(file); 42565d13a37bSArne Jansen return ret; 42575d13a37bSArne Jansen } 42585d13a37bSArne Jansen 4259905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42605d13a37bSArne Jansen { 4261496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42625d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42635d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42645d13a37bSArne Jansen int ret; 42655d13a37bSArne Jansen int err; 42665d13a37bSArne Jansen u64 qgroupid; 42675d13a37bSArne Jansen 42685d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42695d13a37bSArne Jansen return -EPERM; 42705d13a37bSArne Jansen 4271905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4272905b0ddaSMiao Xie if (ret) 4273905b0ddaSMiao Xie return ret; 42745d13a37bSArne Jansen 42755d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4276905b0ddaSMiao Xie if (IS_ERR(sa)) { 4277905b0ddaSMiao Xie ret = PTR_ERR(sa); 4278905b0ddaSMiao Xie goto drop_write; 4279905b0ddaSMiao Xie } 42805d13a37bSArne Jansen 42815d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42825d13a37bSArne Jansen if (IS_ERR(trans)) { 42835d13a37bSArne Jansen ret = PTR_ERR(trans); 42845d13a37bSArne Jansen goto out; 42855d13a37bSArne Jansen } 42865d13a37bSArne Jansen 42875d13a37bSArne Jansen qgroupid = sa->qgroupid; 42885d13a37bSArne Jansen if (!qgroupid) { 42895d13a37bSArne Jansen /* take the current subvol as qgroup */ 42905d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42915d13a37bSArne Jansen } 42925d13a37bSArne Jansen 42935d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42945d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 42955d13a37bSArne Jansen 42965d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42975d13a37bSArne Jansen if (err && !ret) 42985d13a37bSArne Jansen ret = err; 42995d13a37bSArne Jansen 43005d13a37bSArne Jansen out: 43015d13a37bSArne Jansen kfree(sa); 4302905b0ddaSMiao Xie drop_write: 4303905b0ddaSMiao Xie mnt_drop_write_file(file); 43045d13a37bSArne Jansen return ret; 43055d13a37bSArne Jansen } 43065d13a37bSArne Jansen 43072f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43082f232036SJan Schmidt { 43096d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43102f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43112f232036SJan Schmidt int ret; 43122f232036SJan Schmidt 43132f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43142f232036SJan Schmidt return -EPERM; 43152f232036SJan Schmidt 43162f232036SJan Schmidt ret = mnt_want_write_file(file); 43172f232036SJan Schmidt if (ret) 43182f232036SJan Schmidt return ret; 43192f232036SJan Schmidt 43202f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43212f232036SJan Schmidt if (IS_ERR(qsa)) { 43222f232036SJan Schmidt ret = PTR_ERR(qsa); 43232f232036SJan Schmidt goto drop_write; 43242f232036SJan Schmidt } 43252f232036SJan Schmidt 43262f232036SJan Schmidt if (qsa->flags) { 43272f232036SJan Schmidt ret = -EINVAL; 43282f232036SJan Schmidt goto out; 43292f232036SJan Schmidt } 43302f232036SJan Schmidt 43312f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 43322f232036SJan Schmidt 43332f232036SJan Schmidt out: 43342f232036SJan Schmidt kfree(qsa); 43352f232036SJan Schmidt drop_write: 43362f232036SJan Schmidt mnt_drop_write_file(file); 43372f232036SJan Schmidt return ret; 43382f232036SJan Schmidt } 43392f232036SJan Schmidt 43402f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 43412f232036SJan Schmidt { 43426d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43432f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43442f232036SJan Schmidt int ret = 0; 43452f232036SJan Schmidt 43462f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43472f232036SJan Schmidt return -EPERM; 43482f232036SJan Schmidt 43492f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 43502f232036SJan Schmidt if (!qsa) 43512f232036SJan Schmidt return -ENOMEM; 43522f232036SJan Schmidt 43532f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43542f232036SJan Schmidt qsa->flags = 1; 43552f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 43562f232036SJan Schmidt } 43572f232036SJan Schmidt 43582f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43592f232036SJan Schmidt ret = -EFAULT; 43602f232036SJan Schmidt 43612f232036SJan Schmidt kfree(qsa); 43622f232036SJan Schmidt return ret; 43632f232036SJan Schmidt } 43642f232036SJan Schmidt 436557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 436657254b6eSJan Schmidt { 436754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 436857254b6eSJan Schmidt 436957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 437057254b6eSJan Schmidt return -EPERM; 437157254b6eSJan Schmidt 437257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 437357254b6eSJan Schmidt } 437457254b6eSJan Schmidt 43758ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 43768ea05e3aSAlexander Block void __user *arg) 43778ea05e3aSAlexander Block { 43788ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 4379496ad9aaSAl Viro struct inode *inode = file_inode(file); 43808ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43818ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43828ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 43838ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 43848ea05e3aSAlexander Block int ret = 0; 4385dd5f9615SStefan Behrens int received_uuid_changed; 43868ea05e3aSAlexander Block 43878ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43888ea05e3aSAlexander Block if (ret < 0) 43898ea05e3aSAlexander Block return ret; 43908ea05e3aSAlexander Block 43918ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 43928ea05e3aSAlexander Block 43938ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 43948ea05e3aSAlexander Block ret = -EINVAL; 43958ea05e3aSAlexander Block goto out; 43968ea05e3aSAlexander Block } 43978ea05e3aSAlexander Block 43988ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43998ea05e3aSAlexander Block ret = -EROFS; 44008ea05e3aSAlexander Block goto out; 44018ea05e3aSAlexander Block } 44028ea05e3aSAlexander Block 44038ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 44048ea05e3aSAlexander Block ret = -EACCES; 44058ea05e3aSAlexander Block goto out; 44068ea05e3aSAlexander Block } 44078ea05e3aSAlexander Block 44088ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 44098ea05e3aSAlexander Block if (IS_ERR(sa)) { 44108ea05e3aSAlexander Block ret = PTR_ERR(sa); 44118ea05e3aSAlexander Block sa = NULL; 44128ea05e3aSAlexander Block goto out; 44138ea05e3aSAlexander Block } 44148ea05e3aSAlexander Block 4415dd5f9615SStefan Behrens /* 4416dd5f9615SStefan Behrens * 1 - root item 4417dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4418dd5f9615SStefan Behrens */ 4419dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44208ea05e3aSAlexander Block if (IS_ERR(trans)) { 44218ea05e3aSAlexander Block ret = PTR_ERR(trans); 44228ea05e3aSAlexander Block trans = NULL; 44238ea05e3aSAlexander Block goto out; 44248ea05e3aSAlexander Block } 44258ea05e3aSAlexander Block 44268ea05e3aSAlexander Block sa->rtransid = trans->transid; 44278ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44288ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44298ea05e3aSAlexander Block 4430dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4431dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4432dd5f9615SStefan Behrens if (received_uuid_changed && 4433dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4434dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4435dd5f9615SStefan Behrens root_item->received_uuid, 4436dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4437dd5f9615SStefan Behrens root->root_key.objectid); 44388ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44398ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44408ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44413cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44423cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44433cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44443cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44458ea05e3aSAlexander Block 44468ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 44478ea05e3aSAlexander Block &root->root_key, &root->root_item); 44488ea05e3aSAlexander Block if (ret < 0) { 44498ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 44508ea05e3aSAlexander Block goto out; 4451dd5f9615SStefan Behrens } 4452dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4453dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4454dd5f9615SStefan Behrens sa->uuid, 4455dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4456dd5f9615SStefan Behrens root->root_key.objectid); 4457dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4458dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4459dd5f9615SStefan Behrens goto out; 4460dd5f9615SStefan Behrens } 4461dd5f9615SStefan Behrens } 44628ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4463dd5f9615SStefan Behrens if (ret < 0) { 4464dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44658ea05e3aSAlexander Block goto out; 44668ea05e3aSAlexander Block } 44678ea05e3aSAlexander Block 44688ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44698ea05e3aSAlexander Block if (ret) 44708ea05e3aSAlexander Block ret = -EFAULT; 44718ea05e3aSAlexander Block 44728ea05e3aSAlexander Block out: 44738ea05e3aSAlexander Block kfree(sa); 44748ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 44758ea05e3aSAlexander Block mnt_drop_write_file(file); 44768ea05e3aSAlexander Block return ret; 44778ea05e3aSAlexander Block } 44788ea05e3aSAlexander Block 4479867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4480867ab667Sjeff.liu { 44816d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4482a1b83ac5SAnand Jain size_t len; 4483867ab667Sjeff.liu int ret; 4484a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4485a1b83ac5SAnand Jain 4486a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4487a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4488a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4489a1b83ac5SAnand Jain 4490a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4491867ab667Sjeff.liu 4492867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4493efe120a0SFrank Holton btrfs_warn(root->fs_info, 4494efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 4495867ab667Sjeff.liu } 4496867ab667Sjeff.liu 4497867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4498867ab667Sjeff.liu 4499867ab667Sjeff.liu return ret ? -EFAULT : 0; 4500867ab667Sjeff.liu } 4501867ab667Sjeff.liu 4502a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4503a8bfd4abSjeff.liu { 45046d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4505a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4506a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4507a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4508a8bfd4abSjeff.liu int ret; 4509a8bfd4abSjeff.liu 4510a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4511a8bfd4abSjeff.liu return -EPERM; 4512a8bfd4abSjeff.liu 4513a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4514a8bfd4abSjeff.liu return -EFAULT; 4515a8bfd4abSjeff.liu 4516a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4517efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 4518a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4519a8bfd4abSjeff.liu return -EINVAL; 4520a8bfd4abSjeff.liu } 4521a8bfd4abSjeff.liu 4522a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4523a8bfd4abSjeff.liu if (ret) 4524a8bfd4abSjeff.liu return ret; 4525a8bfd4abSjeff.liu 4526a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4527a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4528a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4529a8bfd4abSjeff.liu goto out_unlock; 4530a8bfd4abSjeff.liu } 4531a8bfd4abSjeff.liu 4532a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4533a8bfd4abSjeff.liu strcpy(super_block->label, label); 4534a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4535a8bfd4abSjeff.liu ret = btrfs_end_transaction(trans, root); 4536a8bfd4abSjeff.liu 4537a8bfd4abSjeff.liu out_unlock: 4538a8bfd4abSjeff.liu mnt_drop_write_file(file); 4539a8bfd4abSjeff.liu return ret; 4540a8bfd4abSjeff.liu } 4541a8bfd4abSjeff.liu 45422eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45432eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45442eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45452eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45462eaa055fSJeff Mahoney 45472eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 45482eaa055fSJeff Mahoney void __user *arg) 45492eaa055fSJeff Mahoney { 45502eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 45512eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 45522eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 45532eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 45542eaa055fSJeff Mahoney }; 45552eaa055fSJeff Mahoney 45562eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45572eaa055fSJeff Mahoney return -EFAULT; 45582eaa055fSJeff Mahoney 45592eaa055fSJeff Mahoney return 0; 45602eaa055fSJeff Mahoney } 45612eaa055fSJeff Mahoney 45622eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 45632eaa055fSJeff Mahoney { 45642eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45652eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 45662eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 45672eaa055fSJeff Mahoney 45682eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 45692eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 45702eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 45712eaa055fSJeff Mahoney 45722eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45732eaa055fSJeff Mahoney return -EFAULT; 45742eaa055fSJeff Mahoney 45752eaa055fSJeff Mahoney return 0; 45762eaa055fSJeff Mahoney } 45772eaa055fSJeff Mahoney 45783b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 45793b02a68aSJeff Mahoney enum btrfs_feature_set set, 45802eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 45812eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 45822eaa055fSJeff Mahoney { 45833b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 45843b02a68aSJeff Mahoney char *names; 45852eaa055fSJeff Mahoney u64 disallowed, unsupported; 45862eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 45872eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 45882eaa055fSJeff Mahoney 45892eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 45902eaa055fSJeff Mahoney if (unsupported) { 45913b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 45923b02a68aSJeff Mahoney if (names) { 45933b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 45943b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 45953b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 45963b02a68aSJeff Mahoney kfree(names); 45973b02a68aSJeff Mahoney } else 45982eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 45992eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46002eaa055fSJeff Mahoney type, unsupported); 46012eaa055fSJeff Mahoney return -EOPNOTSUPP; 46022eaa055fSJeff Mahoney } 46032eaa055fSJeff Mahoney 46042eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46052eaa055fSJeff Mahoney if (disallowed) { 46063b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46073b02a68aSJeff Mahoney if (names) { 46083b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 46093b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46103b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46113b02a68aSJeff Mahoney kfree(names); 46123b02a68aSJeff Mahoney } else 46132eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 46142eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46152eaa055fSJeff Mahoney type, disallowed); 46162eaa055fSJeff Mahoney return -EPERM; 46172eaa055fSJeff Mahoney } 46182eaa055fSJeff Mahoney 46192eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46202eaa055fSJeff Mahoney if (disallowed) { 46213b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46223b02a68aSJeff Mahoney if (names) { 46233b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 46243b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46253b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46263b02a68aSJeff Mahoney kfree(names); 46273b02a68aSJeff Mahoney } else 46282eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 46292eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46302eaa055fSJeff Mahoney type, disallowed); 46312eaa055fSJeff Mahoney return -EPERM; 46322eaa055fSJeff Mahoney } 46332eaa055fSJeff Mahoney 46342eaa055fSJeff Mahoney return 0; 46352eaa055fSJeff Mahoney } 46362eaa055fSJeff Mahoney 46372eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 46383b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 46392eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46402eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46412eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46422eaa055fSJeff Mahoney 46432eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46442eaa055fSJeff Mahoney { 46452eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46462eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 46472eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46482eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 46492eaa055fSJeff Mahoney u64 newflags; 46502eaa055fSJeff Mahoney int ret; 46512eaa055fSJeff Mahoney 46522eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 46532eaa055fSJeff Mahoney return -EPERM; 46542eaa055fSJeff Mahoney 46552eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 46562eaa055fSJeff Mahoney return -EFAULT; 46572eaa055fSJeff Mahoney 46582eaa055fSJeff Mahoney /* Nothing to do */ 46592eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 46602eaa055fSJeff Mahoney !flags[0].incompat_flags) 46612eaa055fSJeff Mahoney return 0; 46622eaa055fSJeff Mahoney 46632eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 46642eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 46652eaa055fSJeff Mahoney if (ret) 46662eaa055fSJeff Mahoney return ret; 46672eaa055fSJeff Mahoney 46682eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 46692eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 46702eaa055fSJeff Mahoney if (ret) 46712eaa055fSJeff Mahoney return ret; 46722eaa055fSJeff Mahoney 46732eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 46742eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 46752eaa055fSJeff Mahoney if (ret) 46762eaa055fSJeff Mahoney return ret; 46772eaa055fSJeff Mahoney 46782eaa055fSJeff Mahoney trans = btrfs_start_transaction(root, 1); 46792eaa055fSJeff Mahoney if (IS_ERR(trans)) 46802eaa055fSJeff Mahoney return PTR_ERR(trans); 46812eaa055fSJeff Mahoney 46822eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 46832eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 46842eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 46852eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 46862eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 46872eaa055fSJeff Mahoney 46882eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 46892eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 46902eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 46912eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 46922eaa055fSJeff Mahoney 46932eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 46942eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 46952eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 46962eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 46972eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 46982eaa055fSJeff Mahoney 46992eaa055fSJeff Mahoney return btrfs_end_transaction(trans, root); 47002eaa055fSJeff Mahoney } 47012eaa055fSJeff Mahoney 4702f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4703f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4704f46b5a66SChristoph Hellwig { 4705496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47064bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4707f46b5a66SChristoph Hellwig 4708f46b5a66SChristoph Hellwig switch (cmd) { 47096cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 47106cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 47116cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 47126cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 47136cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 47146cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4715f7039b1dSLi Dongyang case FITRIM: 4716f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4717f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4718fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4719fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4720fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 47213de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4722fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 47236f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 47246f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 472576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 472676dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 47270caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 47280caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 47290caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 47300caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 47316ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 47326ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4733f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 47341e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 47351e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 47361e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4737f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4738198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4739f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 47404bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4741f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4742da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4743475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4744475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4745475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4746475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4747f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 47489ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4749f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4750c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4751c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 47527a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4753f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4754f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4755f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4756f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4757ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4758ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4759ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4760ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4761d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4762d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4763d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4764d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 47651406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 47661406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 476701e219e8SJeff Mahoney case BTRFS_IOC_GLOBAL_RSV: 476801e219e8SJeff Mahoney return btrfs_ioctl_global_rsv(root, argp); 47699b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 47709b199859SFilipe David Borba Manana int ret; 47719b199859SFilipe David Borba Manana 477291aef86fSMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0); 47739b199859SFilipe David Borba Manana if (ret) 47749b199859SFilipe David Borba Manana return ret; 47759b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 47769b199859SFilipe David Borba Manana return ret; 47779b199859SFilipe David Borba Manana } 477846204592SSage Weil case BTRFS_IOC_START_SYNC: 47799a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 478046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 47819a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4782475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4783b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4784475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4785475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4786475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4787475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4788c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 47899ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4790837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4791837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 479219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 479319a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 47948ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 47958ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 479631db9f7cSAlexander Block case BTRFS_IOC_SEND: 479731db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4798c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4799b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 48005d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4801905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 48025d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4803905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 48045d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4805905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 48065d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4807905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 48082f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 48092f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 48102f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 48112f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 481257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 481357254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 48143f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 48153f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4816867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4817867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4818a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4819a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4820416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4821416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 48222eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 48232eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 48242eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 48252eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 48262eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 48272eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4828f46b5a66SChristoph Hellwig } 4829f46b5a66SChristoph Hellwig 4830f46b5a66SChristoph Hellwig return -ENOTTY; 4831f46b5a66SChristoph Hellwig } 4832