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" 61*fcebe456SJosef Bacik #include "qgroup.h" 62f46b5a66SChristoph Hellwig 63abccd00fSHugo Mills #ifdef CONFIG_64BIT 64abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 65abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 66abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 67abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 68abccd00fSHugo Mills */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 70abccd00fSHugo Mills __u64 sec; 71abccd00fSHugo Mills __u32 nsec; 72abccd00fSHugo Mills } __attribute__ ((__packed__)); 73abccd00fSHugo Mills 74abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 75abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 76abccd00fSHugo Mills __u64 stransid; /* in */ 77abccd00fSHugo Mills __u64 rtransid; /* out */ 78abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 79abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 80abccd00fSHugo Mills __u64 flags; /* in */ 81abccd00fSHugo Mills __u64 reserved[16]; /* in */ 82abccd00fSHugo Mills } __attribute__ ((__packed__)); 83abccd00fSHugo Mills 84abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 85abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 86abccd00fSHugo Mills #endif 87abccd00fSHugo Mills 88abccd00fSHugo Mills 89416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 90416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 91416161dbSMark Fasheh 926cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 936cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 946cbff00fSChristoph Hellwig { 956cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 966cbff00fSChristoph Hellwig return flags; 976cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 986cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 996cbff00fSChristoph Hellwig else 1006cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1016cbff00fSChristoph Hellwig } 102f46b5a66SChristoph Hellwig 1036cbff00fSChristoph Hellwig /* 1046cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1056cbff00fSChristoph Hellwig */ 1066cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 125d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 126d0092bddSLi Zefan iflags |= FS_COMPR_FL; 127d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 128d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1366cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1386cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1396cbff00fSChristoph Hellwig 1406cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1416cbff00fSChristoph Hellwig 1426cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1436cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1446cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1456cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1466cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1476cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1486cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1496cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1506cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1516cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1526cbff00fSChristoph Hellwig } 1536cbff00fSChristoph Hellwig 1546cbff00fSChristoph Hellwig /* 1556cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1566cbff00fSChristoph Hellwig * 157e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1586cbff00fSChristoph Hellwig */ 1596cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1606cbff00fSChristoph Hellwig { 1610b4dcea5SChris Mason unsigned int flags; 1620b4dcea5SChris Mason 1630b4dcea5SChris Mason if (!dir) 1640b4dcea5SChris Mason return; 1650b4dcea5SChris Mason 1660b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1676cbff00fSChristoph Hellwig 168e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 169e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 170e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 171e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 172e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 173e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 174e27425d6SJosef Bacik } 1756cbff00fSChristoph Hellwig 176213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 177e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 178213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 179213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 180213490b3SLiu Bo } 181e27425d6SJosef Bacik 1826cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1836cbff00fSChristoph Hellwig } 1846cbff00fSChristoph Hellwig 1856cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1866cbff00fSChristoph Hellwig { 187496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1886cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1896cbff00fSChristoph Hellwig 1906cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1916cbff00fSChristoph Hellwig return -EFAULT; 1926cbff00fSChristoph Hellwig return 0; 1936cbff00fSChristoph Hellwig } 1946cbff00fSChristoph Hellwig 19575e7cb7fSLiu Bo static int check_flags(unsigned int flags) 19675e7cb7fSLiu Bo { 19775e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19875e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19975e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 200e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 201e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20275e7cb7fSLiu Bo return -EOPNOTSUPP; 20375e7cb7fSLiu Bo 20475e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20575e7cb7fSLiu Bo return -EINVAL; 20675e7cb7fSLiu Bo 20775e7cb7fSLiu Bo return 0; 20875e7cb7fSLiu Bo } 20975e7cb7fSLiu Bo 2106cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2116cbff00fSChristoph Hellwig { 212496ad9aaSAl Viro struct inode *inode = file_inode(file); 2136cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2146cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2156cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2166cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2176cbff00fSChristoph Hellwig int ret; 218f062abf0SLi Zefan u64 ip_oldflags; 219f062abf0SLi Zefan unsigned int i_oldflags; 2207e97b8daSDavid Sterba umode_t mode; 2216cbff00fSChristoph Hellwig 222bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 223bd60ea0fSDavid Sterba return -EPERM; 224bd60ea0fSDavid Sterba 225b83cc969SLi Zefan if (btrfs_root_readonly(root)) 226b83cc969SLi Zefan return -EROFS; 227b83cc969SLi Zefan 2286cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2296cbff00fSChristoph Hellwig return -EFAULT; 2306cbff00fSChristoph Hellwig 23175e7cb7fSLiu Bo ret = check_flags(flags); 23275e7cb7fSLiu Bo if (ret) 23375e7cb7fSLiu Bo return ret; 2346cbff00fSChristoph Hellwig 235e7848683SJan Kara ret = mnt_want_write_file(file); 236e7848683SJan Kara if (ret) 237e7848683SJan Kara return ret; 238e7848683SJan Kara 2396cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2406cbff00fSChristoph Hellwig 241f062abf0SLi Zefan ip_oldflags = ip->flags; 242f062abf0SLi Zefan i_oldflags = inode->i_flags; 2437e97b8daSDavid Sterba mode = inode->i_mode; 244f062abf0SLi Zefan 2456cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2466cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2476cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2486cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2496cbff00fSChristoph Hellwig ret = -EPERM; 2506cbff00fSChristoph Hellwig goto out_unlock; 2516cbff00fSChristoph Hellwig } 2526cbff00fSChristoph Hellwig } 2536cbff00fSChristoph Hellwig 2546cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2556cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2566cbff00fSChristoph Hellwig else 2576cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2586cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2596cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2606cbff00fSChristoph Hellwig else 2616cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2626cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2636cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2646cbff00fSChristoph Hellwig else 2656cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2666cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2676cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2686cbff00fSChristoph Hellwig else 2696cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2706cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2716cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2726cbff00fSChristoph Hellwig else 2736cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2746cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2756cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2766cbff00fSChristoph Hellwig else 2776cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2787e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2797e97b8daSDavid Sterba if (S_ISREG(mode)) { 2807e97b8daSDavid Sterba /* 2817e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2827e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2837e97b8daSDavid Sterba * status of the file and will not set it. 2847e97b8daSDavid Sterba */ 2857e97b8daSDavid Sterba if (inode->i_size == 0) 2867e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2877e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2887e97b8daSDavid Sterba } else { 289e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2907e97b8daSDavid Sterba } 2917e97b8daSDavid Sterba } else { 2927e97b8daSDavid Sterba /* 2937e97b8daSDavid Sterba * Revert back under same assuptions as above 2947e97b8daSDavid Sterba */ 2957e97b8daSDavid Sterba if (S_ISREG(mode)) { 2967e97b8daSDavid Sterba if (inode->i_size == 0) 2977e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2987e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2997e97b8daSDavid Sterba } else { 300e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3017e97b8daSDavid Sterba } 3027e97b8daSDavid Sterba } 3036cbff00fSChristoph Hellwig 30475e7cb7fSLiu Bo /* 30575e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30675e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30775e7cb7fSLiu Bo * things smaller. 30875e7cb7fSLiu Bo */ 30975e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 31075e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31263541927SFilipe David Borba Manana 31363541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31463541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31563541927SFilipe David Borba Manana goto out_drop; 31675e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 31763541927SFilipe David Borba Manana const char *comp; 31863541927SFilipe David Borba Manana 31975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 32075e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32163541927SFilipe David Borba Manana 32263541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32363541927SFilipe David Borba Manana comp = "lzo"; 32463541927SFilipe David Borba Manana else 32563541927SFilipe David Borba Manana comp = "zlib"; 32663541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 32763541927SFilipe David Borba Manana comp, strlen(comp), 0); 32863541927SFilipe David Borba Manana if (ret) 32963541927SFilipe David Borba Manana goto out_drop; 33063541927SFilipe David Borba Manana 331ebcb904dSLi Zefan } else { 332ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 33375e7cb7fSLiu Bo } 3346cbff00fSChristoph Hellwig 3354da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 336f062abf0SLi Zefan if (IS_ERR(trans)) { 337f062abf0SLi Zefan ret = PTR_ERR(trans); 338f062abf0SLi Zefan goto out_drop; 339f062abf0SLi Zefan } 3406cbff00fSChristoph Hellwig 341306424ccSLi Zefan btrfs_update_iflags(inode); 3420c4d2d95SJosef Bacik inode_inc_iversion(inode); 343306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3446cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3456cbff00fSChristoph Hellwig 3466cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 347f062abf0SLi Zefan out_drop: 348f062abf0SLi Zefan if (ret) { 349f062abf0SLi Zefan ip->flags = ip_oldflags; 350f062abf0SLi Zefan inode->i_flags = i_oldflags; 351f062abf0SLi Zefan } 3526cbff00fSChristoph Hellwig 3536cbff00fSChristoph Hellwig out_unlock: 3546cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 355e7848683SJan Kara mnt_drop_write_file(file); 3562d4e6f6aSliubo return ret; 3576cbff00fSChristoph Hellwig } 3586cbff00fSChristoph Hellwig 3596cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3606cbff00fSChristoph Hellwig { 361496ad9aaSAl Viro struct inode *inode = file_inode(file); 3626cbff00fSChristoph Hellwig 3636cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3646cbff00fSChristoph Hellwig } 365f46b5a66SChristoph Hellwig 366f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 367f7039b1dSLi Dongyang { 36854563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 369f7039b1dSLi Dongyang struct btrfs_device *device; 370f7039b1dSLi Dongyang struct request_queue *q; 371f7039b1dSLi Dongyang struct fstrim_range range; 372f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 373f7039b1dSLi Dongyang u64 num_devices = 0; 374815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 375f7039b1dSLi Dongyang int ret; 376f7039b1dSLi Dongyang 377f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 378f7039b1dSLi Dongyang return -EPERM; 379f7039b1dSLi Dongyang 3801f78160cSXiao Guangrong rcu_read_lock(); 3811f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3821f78160cSXiao Guangrong dev_list) { 383f7039b1dSLi Dongyang if (!device->bdev) 384f7039b1dSLi Dongyang continue; 385f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 386f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 387f7039b1dSLi Dongyang num_devices++; 388f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 389f7039b1dSLi Dongyang minlen); 390f7039b1dSLi Dongyang } 391f7039b1dSLi Dongyang } 3921f78160cSXiao Guangrong rcu_read_unlock(); 393f4c697e6SLukas Czerner 394f7039b1dSLi Dongyang if (!num_devices) 395f7039b1dSLi Dongyang return -EOPNOTSUPP; 396f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 397f7039b1dSLi Dongyang return -EFAULT; 398e515c18bSLukas Czerner if (range.start > total_bytes || 399e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 400f4c697e6SLukas Czerner return -EINVAL; 401f7039b1dSLi Dongyang 402f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 403f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 404815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 405f7039b1dSLi Dongyang if (ret < 0) 406f7039b1dSLi Dongyang return ret; 407f7039b1dSLi Dongyang 408f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 409f7039b1dSLi Dongyang return -EFAULT; 410f7039b1dSLi Dongyang 411f7039b1dSLi Dongyang return 0; 412f7039b1dSLi Dongyang } 413f7039b1dSLi Dongyang 414dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 415dd5f9615SStefan Behrens { 41646e0f66aSChris Mason int i; 41746e0f66aSChris Mason 41846e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 41946e0f66aSChris Mason if (uuid[i]) 42046e0f66aSChris Mason return 0; 42146e0f66aSChris Mason } 42246e0f66aSChris Mason return 1; 423dd5f9615SStefan Behrens } 424dd5f9615SStefan Behrens 425d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 426cb8e7090SChristoph Hellwig struct dentry *dentry, 42772fd032eSSage Weil char *name, int namelen, 4286f72c7e2SArne Jansen u64 *async_transid, 4298696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 430f46b5a66SChristoph Hellwig { 431f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 432f46b5a66SChristoph Hellwig struct btrfs_key key; 433f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 434f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 435f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 436d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 43776dda93cSYan, Zheng struct btrfs_root *new_root; 438d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4398ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4405662344bSTsutomu Itoh struct inode *inode; 441f46b5a66SChristoph Hellwig int ret; 442f46b5a66SChristoph Hellwig int err; 443f46b5a66SChristoph Hellwig u64 objectid; 444f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4453de4586cSChris Mason u64 index = 0; 446d5c12070SMiao Xie u64 qgroup_reserved; 4478ea05e3aSAlexander Block uuid_le new_uuid; 448f46b5a66SChristoph Hellwig 449581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4502fbe8c8aSAl Viro if (ret) 451a22285a6SYan, Zheng return ret; 4526a912213SJosef Bacik 453d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4549ed74f2dSJosef Bacik /* 455d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 456d5c12070SMiao Xie * of create_snapshot(). 4579ed74f2dSJosef Bacik */ 458d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 459dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 460d5c12070SMiao Xie if (ret) 461d5c12070SMiao Xie return ret; 462f46b5a66SChristoph Hellwig 463d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 464d5c12070SMiao Xie if (IS_ERR(trans)) { 465d5c12070SMiao Xie ret = PTR_ERR(trans); 466de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 467de6e8200SLiu Bo qgroup_reserved); 468de6e8200SLiu Bo return ret; 469d5c12070SMiao Xie } 470d5c12070SMiao Xie trans->block_rsv = &block_rsv; 471d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 472f46b5a66SChristoph Hellwig 4738696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4746f72c7e2SArne Jansen if (ret) 4756f72c7e2SArne Jansen goto fail; 4766f72c7e2SArne Jansen 4775d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4785581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4798e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4808e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4818e8a1e31SJosef Bacik goto fail; 4828e8a1e31SJosef Bacik } 483f46b5a66SChristoph Hellwig 4845d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 485f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 486f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4875d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 488f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 489f46b5a66SChristoph Hellwig 4900a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 491f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4925d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 493b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4945d4f98a2SYan Zheng BTRFS_UUID_SIZE); 495f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 496f46b5a66SChristoph Hellwig 4978ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4988ea05e3aSAlexander Block 499f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5003cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5013cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5023cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 5033cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 5043cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 505f46b5a66SChristoph Hellwig 5063cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5073cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5083cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 50908fe4db1SLi Zefan 510f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 51184234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 512f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 513f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 51486b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 51580ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 516f46b5a66SChristoph Hellwig 5178ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5188ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5198ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5208ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5213cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5223cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5238ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5248ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5258ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 526f46b5a66SChristoph Hellwig 527925baeddSChris Mason btrfs_tree_unlock(leaf); 528f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 529f46b5a66SChristoph Hellwig leaf = NULL; 530f46b5a66SChristoph Hellwig 531f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 532f46b5a66SChristoph Hellwig 533f46b5a66SChristoph Hellwig key.objectid = objectid; 5345d4f98a2SYan Zheng key.offset = 0; 535f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 536f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 537f46b5a66SChristoph Hellwig &root_item); 538f46b5a66SChristoph Hellwig if (ret) 539f46b5a66SChristoph Hellwig goto fail; 540f46b5a66SChristoph Hellwig 54176dda93cSYan, Zheng key.offset = (u64)-1; 54276dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 54379787eaaSJeff Mahoney if (IS_ERR(new_root)) { 54479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 54579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 54679787eaaSJeff Mahoney goto fail; 54779787eaaSJeff Mahoney } 54876dda93cSYan, Zheng 54976dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 55076dda93cSYan, Zheng 55163541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 552ce598979SMark Fasheh if (ret) { 553ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 55479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 555ce598979SMark Fasheh goto fail; 556ce598979SMark Fasheh } 557ce598979SMark Fasheh 558f46b5a66SChristoph Hellwig /* 559f46b5a66SChristoph Hellwig * insert the directory item 560f46b5a66SChristoph Hellwig */ 5613de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 56279787eaaSJeff Mahoney if (ret) { 56379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 56479787eaaSJeff Mahoney goto fail; 56579787eaaSJeff Mahoney } 5663de4586cSChris Mason 5673de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 56816cdcec7SMiao Xie name, namelen, dir, &key, 5693de4586cSChris Mason BTRFS_FT_DIR, index); 57079787eaaSJeff Mahoney if (ret) { 57179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 572f46b5a66SChristoph Hellwig goto fail; 57379787eaaSJeff Mahoney } 5740660b5afSChris Mason 57552c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 57652c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 57752c26179SYan Zheng BUG_ON(ret); 57852c26179SYan Zheng 5790660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5804df27c4dSYan, Zheng objectid, root->root_key.objectid, 58133345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5820660b5afSChris Mason BUG_ON(ret); 5830660b5afSChris Mason 584dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 585dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 586dd5f9615SStefan Behrens objectid); 587dd5f9615SStefan Behrens if (ret) 588dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 589dd5f9615SStefan Behrens 590f46b5a66SChristoph Hellwig fail: 591d5c12070SMiao Xie trans->block_rsv = NULL; 592d5c12070SMiao Xie trans->bytes_reserved = 0; 593de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 594de6e8200SLiu Bo 59572fd032eSSage Weil if (async_transid) { 59672fd032eSSage Weil *async_transid = trans->transid; 59772fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 59800d71c9cSMiao Xie if (err) 59900d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 60072fd032eSSage Weil } else { 60176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 60272fd032eSSage Weil } 603f46b5a66SChristoph Hellwig if (err && !ret) 604f46b5a66SChristoph Hellwig ret = err; 6051a65e24bSChris Mason 6065662344bSTsutomu Itoh if (!ret) { 6075662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 608de6e8200SLiu Bo if (IS_ERR(inode)) 609de6e8200SLiu Bo return PTR_ERR(inode); 6105662344bSTsutomu Itoh d_instantiate(dentry, inode); 6115662344bSTsutomu Itoh } 612f46b5a66SChristoph Hellwig return ret; 613f46b5a66SChristoph Hellwig } 614f46b5a66SChristoph Hellwig 6158257b2dcSMiao Xie static void btrfs_wait_nocow_write(struct btrfs_root *root) 6168257b2dcSMiao Xie { 6178257b2dcSMiao Xie s64 writers; 6188257b2dcSMiao Xie DEFINE_WAIT(wait); 6198257b2dcSMiao Xie 6208257b2dcSMiao Xie do { 6218257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6228257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6238257b2dcSMiao Xie 6248257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6258257b2dcSMiao Xie if (writers) 6268257b2dcSMiao Xie schedule(); 6278257b2dcSMiao Xie 6288257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6298257b2dcSMiao Xie } while (writers); 6308257b2dcSMiao Xie } 6318257b2dcSMiao Xie 632e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 633e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 634e9662f70SMiao Xie u64 *async_transid, bool readonly, 635e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 636f46b5a66SChristoph Hellwig { 6372e4bfab9SYan, Zheng struct inode *inode; 638f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 639f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6402e4bfab9SYan, Zheng int ret; 641f46b5a66SChristoph Hellwig 64227cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 643f46b5a66SChristoph Hellwig return -EINVAL; 644f46b5a66SChristoph Hellwig 6458257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6468257b2dcSMiao Xie smp_mb__after_atomic_inc(); 6478257b2dcSMiao Xie btrfs_wait_nocow_write(root); 6488257b2dcSMiao Xie 6496a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6506a03843dSMiao Xie if (ret) 6518257b2dcSMiao Xie goto out; 6526a03843dSMiao Xie 653b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6546a03843dSMiao Xie 655a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 6568257b2dcSMiao Xie if (!pending_snapshot) { 6578257b2dcSMiao Xie ret = -ENOMEM; 6588257b2dcSMiao Xie goto out; 6598257b2dcSMiao Xie } 660a22285a6SYan, Zheng 66166d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 66266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 663d5c12070SMiao Xie /* 664d5c12070SMiao Xie * 1 - parent dir inode 665d5c12070SMiao Xie * 2 - dir entries 666d5c12070SMiao Xie * 1 - root item 667d5c12070SMiao Xie * 2 - root ref/backref 668d5c12070SMiao Xie * 1 - root of snapshot 669dd5f9615SStefan Behrens * 1 - UUID item 670d5c12070SMiao Xie */ 671d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 672dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 673ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 674ee3441b4SJeff Mahoney false); 675d5c12070SMiao Xie if (ret) 6768257b2dcSMiao Xie goto free; 677d5c12070SMiao Xie 678a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 679a22285a6SYan, Zheng pending_snapshot->root = root; 680b83cc969SLi Zefan pending_snapshot->readonly = readonly; 681e9662f70SMiao Xie pending_snapshot->dir = dir; 6828696c533SMiao Xie pending_snapshot->inherit = inherit; 683a22285a6SYan, Zheng 684d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 685a22285a6SYan, Zheng if (IS_ERR(trans)) { 686a22285a6SYan, Zheng ret = PTR_ERR(trans); 687a22285a6SYan, Zheng goto fail; 688a22285a6SYan, Zheng } 689a22285a6SYan, Zheng 6908351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 691a22285a6SYan, Zheng list_add(&pending_snapshot->list, 692a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6938351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 69472fd032eSSage Weil if (async_transid) { 69572fd032eSSage Weil *async_transid = trans->transid; 69672fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 69772fd032eSSage Weil root->fs_info->extent_root, 1); 69800d71c9cSMiao Xie if (ret) 69900d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 70072fd032eSSage Weil } else { 70172fd032eSSage Weil ret = btrfs_commit_transaction(trans, 70272fd032eSSage Weil root->fs_info->extent_root); 70372fd032eSSage Weil } 704aec8030aSMiao Xie if (ret) 705c37b2b62SJosef Bacik goto fail; 706a22285a6SYan, Zheng 707a22285a6SYan, Zheng ret = pending_snapshot->error; 708f46b5a66SChristoph Hellwig if (ret) 7092e4bfab9SYan, Zheng goto fail; 710f46b5a66SChristoph Hellwig 71166b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 71266b4ffd1SJosef Bacik if (ret) 71366b4ffd1SJosef Bacik goto fail; 714f46b5a66SChristoph Hellwig 7152fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 7162e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7172e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7182e4bfab9SYan, Zheng goto fail; 7192e4bfab9SYan, Zheng } 7205662344bSTsutomu Itoh 7212e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7222e4bfab9SYan, Zheng ret = 0; 7232e4bfab9SYan, Zheng fail: 724d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 725d5c12070SMiao Xie &pending_snapshot->block_rsv, 726d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 7278257b2dcSMiao Xie free: 728a22285a6SYan, Zheng kfree(pending_snapshot); 7298257b2dcSMiao Xie out: 7308257b2dcSMiao Xie atomic_dec(&root->will_be_snapshoted); 731f46b5a66SChristoph Hellwig return ret; 732f46b5a66SChristoph Hellwig } 733f46b5a66SChristoph Hellwig 7344260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 7354260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 7364260f7c7SSage Weil * minimal. 7374260f7c7SSage Weil */ 7384260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 7394260f7c7SSage Weil { 7402f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 7414260f7c7SSage Weil 7424260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 7434260f7c7SSage Weil return 0; 7442f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 7454260f7c7SSage Weil return 0; 7462f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 7474260f7c7SSage Weil return 0; 7484260f7c7SSage Weil return !capable(CAP_FOWNER); 7494260f7c7SSage Weil } 7504260f7c7SSage Weil 7514260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7524260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7534260f7c7SSage Weil * whether the type of victim is right. 7544260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7554260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7564260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7574260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7584260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7594260f7c7SSage Weil * a. be owner of dir, or 7604260f7c7SSage Weil * b. be owner of victim, or 7614260f7c7SSage Weil * c. have CAP_FOWNER capability 7624260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7634260f7c7SSage Weil * links pointing to it. 7644260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7654260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7664260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7674260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7684260f7c7SSage Weil * nfs_async_unlink(). 7694260f7c7SSage Weil */ 7704260f7c7SSage Weil 7714260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7724260f7c7SSage Weil { 7734260f7c7SSage Weil int error; 7744260f7c7SSage Weil 7754260f7c7SSage Weil if (!victim->d_inode) 7764260f7c7SSage Weil return -ENOENT; 7774260f7c7SSage Weil 7784260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7794fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7804260f7c7SSage Weil 7814260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7824260f7c7SSage Weil if (error) 7834260f7c7SSage Weil return error; 7844260f7c7SSage Weil if (IS_APPEND(dir)) 7854260f7c7SSage Weil return -EPERM; 7864260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7874260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7884260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7894260f7c7SSage Weil return -EPERM; 7904260f7c7SSage Weil if (isdir) { 7914260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7924260f7c7SSage Weil return -ENOTDIR; 7934260f7c7SSage Weil if (IS_ROOT(victim)) 7944260f7c7SSage Weil return -EBUSY; 7954260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7964260f7c7SSage Weil return -EISDIR; 7974260f7c7SSage Weil if (IS_DEADDIR(dir)) 7984260f7c7SSage Weil return -ENOENT; 7994260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8004260f7c7SSage Weil return -EBUSY; 8014260f7c7SSage Weil return 0; 8024260f7c7SSage Weil } 8034260f7c7SSage Weil 804cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 805cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 806cb8e7090SChristoph Hellwig { 807cb8e7090SChristoph Hellwig if (child->d_inode) 808cb8e7090SChristoph Hellwig return -EEXIST; 809cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 810cb8e7090SChristoph Hellwig return -ENOENT; 811cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 812cb8e7090SChristoph Hellwig } 813cb8e7090SChristoph Hellwig 814cb8e7090SChristoph Hellwig /* 815cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 816cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 817cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 818cb8e7090SChristoph Hellwig */ 81976dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 82076dda93cSYan, Zheng char *name, int namelen, 82172fd032eSSage Weil struct btrfs_root *snap_src, 8226f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8238696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 824cb8e7090SChristoph Hellwig { 82576dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 826cb8e7090SChristoph Hellwig struct dentry *dentry; 827cb8e7090SChristoph Hellwig int error; 828cb8e7090SChristoph Hellwig 8295c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8305c50c9b8SDavid Sterba if (error == -EINTR) 8315c50c9b8SDavid Sterba return error; 832cb8e7090SChristoph Hellwig 833cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 834cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 835cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 836cb8e7090SChristoph Hellwig goto out_unlock; 837cb8e7090SChristoph Hellwig 838cb8e7090SChristoph Hellwig error = -EEXIST; 839cb8e7090SChristoph Hellwig if (dentry->d_inode) 840cb8e7090SChristoph Hellwig goto out_dput; 841cb8e7090SChristoph Hellwig 84276dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 843cb8e7090SChristoph Hellwig if (error) 844a874a63eSLiu Bo goto out_dput; 845cb8e7090SChristoph Hellwig 8469c52057cSChris Mason /* 8479c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8489c52057cSChris Mason * check for them now when we can safely fail 8499c52057cSChris Mason */ 8509c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8519c52057cSChris Mason dir->i_ino, name, 8529c52057cSChris Mason namelen); 8539c52057cSChris Mason if (error) 8549c52057cSChris Mason goto out_dput; 8559c52057cSChris Mason 85676dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 85776dda93cSYan, Zheng 85876dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 85976dda93cSYan, Zheng goto out_up_read; 86076dda93cSYan, Zheng 8613de4586cSChris Mason if (snap_src) { 862e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8636f72c7e2SArne Jansen async_transid, readonly, inherit); 8643de4586cSChris Mason } else { 865d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 866d5c12070SMiao Xie async_transid, inherit); 8673de4586cSChris Mason } 86876dda93cSYan, Zheng if (!error) 86976dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 87076dda93cSYan, Zheng out_up_read: 87176dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 872cb8e7090SChristoph Hellwig out_dput: 873cb8e7090SChristoph Hellwig dput(dentry); 874cb8e7090SChristoph Hellwig out_unlock: 87576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 876cb8e7090SChristoph Hellwig return error; 877cb8e7090SChristoph Hellwig } 878cb8e7090SChristoph Hellwig 8794cb5300bSChris Mason /* 8804cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8814cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8824cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8834cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8844cb5300bSChris Mason * part of the file 8854cb5300bSChris Mason */ 8864cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8874cb5300bSChris Mason { 8884cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8894cb5300bSChris Mason struct extent_map *em = NULL; 8904cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8914cb5300bSChris Mason u64 end; 8924cb5300bSChris Mason 8934cb5300bSChris Mason read_lock(&em_tree->lock); 8944cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8954cb5300bSChris Mason read_unlock(&em_tree->lock); 8964cb5300bSChris Mason 8974cb5300bSChris Mason if (em) { 8984cb5300bSChris Mason end = extent_map_end(em); 8994cb5300bSChris Mason free_extent_map(em); 9004cb5300bSChris Mason if (end - offset > thresh) 9014cb5300bSChris Mason return 0; 9024cb5300bSChris Mason } 9034cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9044cb5300bSChris Mason thresh /= 2; 9054cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9064cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9074cb5300bSChris Mason if (end >= thresh) 9084cb5300bSChris Mason return 0; 9094cb5300bSChris Mason return 1; 9104cb5300bSChris Mason } 9114cb5300bSChris Mason 9124cb5300bSChris Mason /* 9134cb5300bSChris Mason * helper function to walk through a file and find extents 9144cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9154cb5300bSChris Mason * 9164cb5300bSChris Mason * This is used by the defragging code to find new and small 9174cb5300bSChris Mason * extents 9184cb5300bSChris Mason */ 9194cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9204cb5300bSChris Mason struct inode *inode, u64 newer_than, 9214cb5300bSChris Mason u64 *off, int thresh) 9224cb5300bSChris Mason { 9234cb5300bSChris Mason struct btrfs_path *path; 9244cb5300bSChris Mason struct btrfs_key min_key; 9254cb5300bSChris Mason struct extent_buffer *leaf; 9264cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9274cb5300bSChris Mason int type; 9284cb5300bSChris Mason int ret; 929a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9304cb5300bSChris Mason 9314cb5300bSChris Mason path = btrfs_alloc_path(); 9324cb5300bSChris Mason if (!path) 9334cb5300bSChris Mason return -ENOMEM; 9344cb5300bSChris Mason 935a4689d2bSDavid Sterba min_key.objectid = ino; 9364cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9374cb5300bSChris Mason min_key.offset = *off; 9384cb5300bSChris Mason 9394cb5300bSChris Mason while (1) { 940f094c9bdSFilipe Manana path->keep_locks = 1; 9416174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9424cb5300bSChris Mason if (ret != 0) 9434cb5300bSChris Mason goto none; 944f094c9bdSFilipe Manana path->keep_locks = 0; 945f094c9bdSFilipe Manana btrfs_unlock_up_safe(path, 1); 946f094c9bdSFilipe Manana process_slot: 947a4689d2bSDavid Sterba if (min_key.objectid != ino) 9484cb5300bSChris Mason goto none; 9494cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9504cb5300bSChris Mason goto none; 9514cb5300bSChris Mason 9524cb5300bSChris Mason leaf = path->nodes[0]; 9534cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9544cb5300bSChris Mason struct btrfs_file_extent_item); 9554cb5300bSChris Mason 9564cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9574cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9584cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9594cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9604cb5300bSChris Mason *off = min_key.offset; 9614cb5300bSChris Mason btrfs_free_path(path); 9624cb5300bSChris Mason return 0; 9634cb5300bSChris Mason } 9644cb5300bSChris Mason 965f094c9bdSFilipe Manana path->slots[0]++; 966f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 967f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 968f094c9bdSFilipe Manana goto process_slot; 969f094c9bdSFilipe Manana } 970f094c9bdSFilipe Manana 9714cb5300bSChris Mason if (min_key.offset == (u64)-1) 9724cb5300bSChris Mason goto none; 9734cb5300bSChris Mason 9744cb5300bSChris Mason min_key.offset++; 9754cb5300bSChris Mason btrfs_release_path(path); 9764cb5300bSChris Mason } 9774cb5300bSChris Mason none: 9784cb5300bSChris Mason btrfs_free_path(path); 9794cb5300bSChris Mason return -ENOENT; 9804cb5300bSChris Mason } 9814cb5300bSChris Mason 9826c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98317ce6ef8SLiu Bo { 98417ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 985940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9866c282eb4SLi Zefan struct extent_map *em; 9876c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 988940100a4SChris Mason 989940100a4SChris Mason /* 990940100a4SChris Mason * hopefully we have this extent in the tree already, try without 991940100a4SChris Mason * the full extent lock 992940100a4SChris Mason */ 993940100a4SChris Mason read_lock(&em_tree->lock); 994940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 995940100a4SChris Mason read_unlock(&em_tree->lock); 996940100a4SChris Mason 997940100a4SChris Mason if (!em) { 998308d9800SFilipe Manana struct extent_state *cached = NULL; 999308d9800SFilipe Manana u64 end = start + len - 1; 1000308d9800SFilipe Manana 1001940100a4SChris Mason /* get the big lock and read metadata off disk */ 1002308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 1003940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1004308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1005940100a4SChris Mason 10066cf8bfbfSDan Carpenter if (IS_ERR(em)) 10076c282eb4SLi Zefan return NULL; 1008940100a4SChris Mason } 1009940100a4SChris Mason 10106c282eb4SLi Zefan return em; 10116c282eb4SLi Zefan } 10126c282eb4SLi Zefan 10136c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10146c282eb4SLi Zefan { 10156c282eb4SLi Zefan struct extent_map *next; 10166c282eb4SLi Zefan bool ret = true; 10176c282eb4SLi Zefan 10186c282eb4SLi Zefan /* this is the last extent */ 10196c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10206c282eb4SLi Zefan return false; 10216c282eb4SLi Zefan 10226c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1023e2127cf0SFilipe Manana if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE || 1024e2127cf0SFilipe Manana (em->block_start + em->block_len == next->block_start)) 10256c282eb4SLi Zefan ret = false; 10266c282eb4SLi Zefan 10276c282eb4SLi Zefan free_extent_map(next); 10286c282eb4SLi Zefan return ret; 10296c282eb4SLi Zefan } 10306c282eb4SLi Zefan 10316c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 1032a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1033a43a2111SAndrew Mahone int compress) 10346c282eb4SLi Zefan { 10356c282eb4SLi Zefan struct extent_map *em; 10366c282eb4SLi Zefan int ret = 1; 10376c282eb4SLi Zefan bool next_mergeable = true; 10386c282eb4SLi Zefan 10396c282eb4SLi Zefan /* 10406c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10416c282eb4SLi Zefan * defragging it 10426c282eb4SLi Zefan */ 10436c282eb4SLi Zefan if (start < *defrag_end) 10446c282eb4SLi Zefan return 1; 10456c282eb4SLi Zefan 10466c282eb4SLi Zefan *skip = 0; 10476c282eb4SLi Zefan 10486c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10496c282eb4SLi Zefan if (!em) 10506c282eb4SLi Zefan return 0; 10516c282eb4SLi Zefan 1052940100a4SChris Mason /* this will cover holes, and inline extents */ 105317ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1054940100a4SChris Mason ret = 0; 105517ce6ef8SLiu Bo goto out; 105617ce6ef8SLiu Bo } 105717ce6ef8SLiu Bo 10586c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1059940100a4SChris Mason 1060940100a4SChris Mason /* 10616c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10626c282eb4SLi Zefan * real extent, don't bother defragging it 1063940100a4SChris Mason */ 1064a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10656c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1066940100a4SChris Mason ret = 0; 106717ce6ef8SLiu Bo out: 1068940100a4SChris Mason /* 1069940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1070940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1071940100a4SChris Mason * so that the next tiny extent will force a defrag. 1072940100a4SChris Mason * 1073940100a4SChris Mason * The end result of this is that tiny extents before a single big 1074940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1075940100a4SChris Mason */ 1076940100a4SChris Mason if (ret) { 1077940100a4SChris Mason *defrag_end = extent_map_end(em); 1078940100a4SChris Mason } else { 1079940100a4SChris Mason *last_len = 0; 1080940100a4SChris Mason *skip = extent_map_end(em); 1081940100a4SChris Mason *defrag_end = 0; 1082940100a4SChris Mason } 1083940100a4SChris Mason 1084940100a4SChris Mason free_extent_map(em); 1085940100a4SChris Mason return ret; 1086940100a4SChris Mason } 1087940100a4SChris Mason 10884cb5300bSChris Mason /* 10894cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10904cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10914cb5300bSChris Mason * to COW and defrag. 10924cb5300bSChris Mason * 10934cb5300bSChris Mason * It also makes sure the delalloc code has enough 10944cb5300bSChris Mason * dirty data to avoid making new small extents as part 10954cb5300bSChris Mason * of the defrag 10964cb5300bSChris Mason * 10974cb5300bSChris Mason * It's a good idea to start RA on this range 10984cb5300bSChris Mason * before calling this. 10994cb5300bSChris Mason */ 11004cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11014cb5300bSChris Mason struct page **pages, 11024cb5300bSChris Mason unsigned long start_index, 1103c41570c9SJustin Maggard unsigned long num_pages) 1104f46b5a66SChristoph Hellwig { 11054cb5300bSChris Mason unsigned long file_end; 11064cb5300bSChris Mason u64 isize = i_size_read(inode); 1107f46b5a66SChristoph Hellwig u64 page_start; 1108f46b5a66SChristoph Hellwig u64 page_end; 11091f12bd06SLiu Bo u64 page_cnt; 11104cb5300bSChris Mason int ret; 11114cb5300bSChris Mason int i; 11124cb5300bSChris Mason int i_done; 11134cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11144cb5300bSChris Mason struct extent_state *cached_state = NULL; 1115600a45e1SMiao Xie struct extent_io_tree *tree; 11163b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11174cb5300bSChris Mason 11184cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11191f12bd06SLiu Bo if (!isize || start_index > file_end) 11201f12bd06SLiu Bo return 0; 11211f12bd06SLiu Bo 11221f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11234cb5300bSChris Mason 11244cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 11251f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11264cb5300bSChris Mason if (ret) 11274cb5300bSChris Mason return ret; 11284cb5300bSChris Mason i_done = 0; 1129600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11304cb5300bSChris Mason 11314cb5300bSChris Mason /* step one, lock all the pages */ 11321f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11334cb5300bSChris Mason struct page *page; 1134600a45e1SMiao Xie again: 1135a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11363b16a4e3SJosef Bacik start_index + i, mask); 11374cb5300bSChris Mason if (!page) 11384cb5300bSChris Mason break; 11394cb5300bSChris Mason 1140600a45e1SMiao Xie page_start = page_offset(page); 1141600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1142600a45e1SMiao Xie while (1) { 1143308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1144308d9800SFilipe Manana 0, &cached_state); 1145600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1146600a45e1SMiao Xie page_start); 1147308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1148308d9800SFilipe Manana &cached_state, GFP_NOFS); 1149600a45e1SMiao Xie if (!ordered) 1150600a45e1SMiao Xie break; 1151600a45e1SMiao Xie 1152600a45e1SMiao Xie unlock_page(page); 1153600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1154600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1155600a45e1SMiao Xie lock_page(page); 11561f12bd06SLiu Bo /* 11571f12bd06SLiu Bo * we unlocked the page above, so we need check if 11581f12bd06SLiu Bo * it was released or not. 11591f12bd06SLiu Bo */ 11601f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11611f12bd06SLiu Bo unlock_page(page); 11621f12bd06SLiu Bo page_cache_release(page); 11631f12bd06SLiu Bo goto again; 11641f12bd06SLiu Bo } 1165600a45e1SMiao Xie } 1166600a45e1SMiao Xie 11674cb5300bSChris Mason if (!PageUptodate(page)) { 11684cb5300bSChris Mason btrfs_readpage(NULL, page); 11694cb5300bSChris Mason lock_page(page); 11704cb5300bSChris Mason if (!PageUptodate(page)) { 11714cb5300bSChris Mason unlock_page(page); 11724cb5300bSChris Mason page_cache_release(page); 11734cb5300bSChris Mason ret = -EIO; 11744cb5300bSChris Mason break; 11754cb5300bSChris Mason } 11764cb5300bSChris Mason } 1177600a45e1SMiao Xie 1178600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1179600a45e1SMiao Xie unlock_page(page); 1180600a45e1SMiao Xie page_cache_release(page); 1181600a45e1SMiao Xie goto again; 1182600a45e1SMiao Xie } 1183600a45e1SMiao Xie 11844cb5300bSChris Mason pages[i] = page; 11854cb5300bSChris Mason i_done++; 11864cb5300bSChris Mason } 11874cb5300bSChris Mason if (!i_done || ret) 11884cb5300bSChris Mason goto out; 11894cb5300bSChris Mason 11904cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11914cb5300bSChris Mason goto out; 11924cb5300bSChris Mason 11934cb5300bSChris Mason /* 11944cb5300bSChris Mason * so now we have a nice long stream of locked 11954cb5300bSChris Mason * and up to date pages, lets wait on them 11964cb5300bSChris Mason */ 11974cb5300bSChris Mason for (i = 0; i < i_done; i++) 11984cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11994cb5300bSChris Mason 12004cb5300bSChris Mason page_start = page_offset(pages[0]); 12014cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12024cb5300bSChris Mason 12034cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1204d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 12054cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12064cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12079e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12089e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12094cb5300bSChris Mason 12101f12bd06SLiu Bo if (i_done != page_cnt) { 12119e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12129e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12139e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12144cb5300bSChris Mason btrfs_delalloc_release_space(inode, 12151f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12164cb5300bSChris Mason } 12174cb5300bSChris Mason 12184cb5300bSChris Mason 12199e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12209e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12214cb5300bSChris Mason 12224cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12234cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12244cb5300bSChris Mason GFP_NOFS); 12254cb5300bSChris Mason 12264cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12274cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12284cb5300bSChris Mason ClearPageChecked(pages[i]); 12294cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12304cb5300bSChris Mason set_page_dirty(pages[i]); 12314cb5300bSChris Mason unlock_page(pages[i]); 12324cb5300bSChris Mason page_cache_release(pages[i]); 12334cb5300bSChris Mason } 12344cb5300bSChris Mason return i_done; 12354cb5300bSChris Mason out: 12364cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12374cb5300bSChris Mason unlock_page(pages[i]); 12384cb5300bSChris Mason page_cache_release(pages[i]); 12394cb5300bSChris Mason } 12401f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12414cb5300bSChris Mason return ret; 12424cb5300bSChris Mason 12434cb5300bSChris Mason } 12444cb5300bSChris Mason 12454cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12464cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12474cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12484cb5300bSChris Mason { 12494cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12504cb5300bSChris Mason struct file_ra_state *ra = NULL; 12514cb5300bSChris Mason unsigned long last_index; 1252151a31b2SLi Zefan u64 isize = i_size_read(inode); 1253940100a4SChris Mason u64 last_len = 0; 1254940100a4SChris Mason u64 skip = 0; 1255940100a4SChris Mason u64 defrag_end = 0; 12564cb5300bSChris Mason u64 newer_off = range->start; 1257f46b5a66SChristoph Hellwig unsigned long i; 1258008873eaSLi Zefan unsigned long ra_index = 0; 1259f46b5a66SChristoph Hellwig int ret; 12604cb5300bSChris Mason int defrag_count = 0; 12611a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 12624cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1263c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1264c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12654cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12664cb5300bSChris Mason struct page **pages = NULL; 12674cb5300bSChris Mason 12680abd5b17SLiu Bo if (isize == 0) 12690abd5b17SLiu Bo return 0; 12700abd5b17SLiu Bo 12710abd5b17SLiu Bo if (range->start >= isize) 12720abd5b17SLiu Bo return -EINVAL; 12731a419d85SLi Zefan 12741a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12751a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12761a419d85SLi Zefan return -EINVAL; 12771a419d85SLi Zefan if (range->compress_type) 12781a419d85SLi Zefan compress_type = range->compress_type; 12791a419d85SLi Zefan } 1280f46b5a66SChristoph Hellwig 12810abd5b17SLiu Bo if (extent_thresh == 0) 12820abd5b17SLiu Bo extent_thresh = 256 * 1024; 1283f46b5a66SChristoph Hellwig 12844cb5300bSChris Mason /* 12854cb5300bSChris Mason * if we were not given a file, allocate a readahead 12864cb5300bSChris Mason * context 12874cb5300bSChris Mason */ 12884cb5300bSChris Mason if (!file) { 12894cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12904cb5300bSChris Mason if (!ra) 12914cb5300bSChris Mason return -ENOMEM; 12924cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12934cb5300bSChris Mason } else { 12944cb5300bSChris Mason ra = &file->f_ra; 12954cb5300bSChris Mason } 12964cb5300bSChris Mason 1297d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12984cb5300bSChris Mason GFP_NOFS); 12994cb5300bSChris Mason if (!pages) { 13004cb5300bSChris Mason ret = -ENOMEM; 13014cb5300bSChris Mason goto out_ra; 13024cb5300bSChris Mason } 13034cb5300bSChris Mason 13044cb5300bSChris Mason /* find the last page to defrag */ 13051e701a32SChris Mason if (range->start + range->len > range->start) { 1306151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13071e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13081e701a32SChris Mason } else { 1309151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13101e701a32SChris Mason } 13111e701a32SChris Mason 13124cb5300bSChris Mason if (newer_than) { 13134cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13144cb5300bSChris Mason &newer_off, 64 * 1024); 13154cb5300bSChris Mason if (!ret) { 13164cb5300bSChris Mason range->start = newer_off; 13174cb5300bSChris Mason /* 13184cb5300bSChris Mason * we always align our defrag to help keep 13194cb5300bSChris Mason * the extents in the file evenly spaced 13204cb5300bSChris Mason */ 13214cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13224cb5300bSChris Mason } else 13234cb5300bSChris Mason goto out_ra; 13244cb5300bSChris Mason } else { 13251e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13264cb5300bSChris Mason } 13274cb5300bSChris Mason if (!max_to_defrag) 13287ec31b54SLiu Bo max_to_defrag = last_index + 1; 13294cb5300bSChris Mason 13302a0f7f57SLi Zefan /* 13312a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13322a0f7f57SLi Zefan * written sequentially. 13332a0f7f57SLi Zefan */ 13342a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13352a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13362a0f7f57SLi Zefan 1337f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1338f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1339f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 13404cb5300bSChris Mason /* 13414cb5300bSChris Mason * make sure we stop running if someone unmounts 13424cb5300bSChris Mason * the FS 13434cb5300bSChris Mason */ 13444cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13454cb5300bSChris Mason break; 13464cb5300bSChris Mason 1347210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1348efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1349210549ebSDavid Sterba ret = -EAGAIN; 1350210549ebSDavid Sterba break; 1351210549ebSDavid Sterba } 1352210549ebSDavid Sterba 135366c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13546c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1355a43a2111SAndrew Mahone &defrag_end, range->flags & 1356a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1357940100a4SChris Mason unsigned long next; 1358940100a4SChris Mason /* 1359940100a4SChris Mason * the should_defrag function tells us how much to skip 1360940100a4SChris Mason * bump our counter by the suggested amount 1361940100a4SChris Mason */ 1362940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1363940100a4SChris Mason i = max(i + 1, next); 1364940100a4SChris Mason continue; 1365940100a4SChris Mason } 1366008873eaSLi Zefan 1367008873eaSLi Zefan if (!newer_than) { 1368008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1369008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1370008873eaSLi Zefan cluster = min(cluster, max_cluster); 1371008873eaSLi Zefan } else { 1372008873eaSLi Zefan cluster = max_cluster; 1373008873eaSLi Zefan } 1374008873eaSLi Zefan 1375008873eaSLi Zefan if (i + cluster > ra_index) { 1376008873eaSLi Zefan ra_index = max(i, ra_index); 1377008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1378008873eaSLi Zefan cluster); 1379008873eaSLi Zefan ra_index += max_cluster; 1380008873eaSLi Zefan } 13814cb5300bSChris Mason 1382ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1383633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1384633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1385008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1386ecb8bea8SLiu Bo if (ret < 0) { 1387ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13884cb5300bSChris Mason goto out_ra; 1389ecb8bea8SLiu Bo } 13904cb5300bSChris Mason 13914cb5300bSChris Mason defrag_count += ret; 1392d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1393ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13944cb5300bSChris Mason 13954cb5300bSChris Mason if (newer_than) { 13964cb5300bSChris Mason if (newer_off == (u64)-1) 13974cb5300bSChris Mason break; 13984cb5300bSChris Mason 1399e1f041e1SLiu Bo if (ret > 0) 1400e1f041e1SLiu Bo i += ret; 1401e1f041e1SLiu Bo 14024cb5300bSChris Mason newer_off = max(newer_off + 1, 14034cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14044cb5300bSChris Mason 14054cb5300bSChris Mason ret = find_new_extents(root, inode, 14064cb5300bSChris Mason newer_than, &newer_off, 14074cb5300bSChris Mason 64 * 1024); 14084cb5300bSChris Mason if (!ret) { 14094cb5300bSChris Mason range->start = newer_off; 14104cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14114cb5300bSChris Mason } else { 14124cb5300bSChris Mason break; 1413940100a4SChris Mason } 14144cb5300bSChris Mason } else { 1415008873eaSLi Zefan if (ret > 0) { 1416cbcc8326SLi Zefan i += ret; 1417008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1418008873eaSLi Zefan } else { 1419940100a4SChris Mason i++; 1420008873eaSLi Zefan last_len = 0; 1421008873eaSLi Zefan } 1422f46b5a66SChristoph Hellwig } 14234cb5300bSChris Mason } 1424f46b5a66SChristoph Hellwig 1425dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14261e701a32SChris Mason filemap_flush(inode->i_mapping); 1427dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1428dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1429dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1430dec8ef90SFilipe Manana } 14311e701a32SChris Mason 14321e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14331e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14341e701a32SChris Mason * we have to make sure the IO is actually started and that 14351e701a32SChris Mason * ordered extents get created before we return 14361e701a32SChris Mason */ 14371e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14381e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14391e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14401e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14411e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14421e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14431e701a32SChris Mason } 14441e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14451e701a32SChris Mason } 14461e701a32SChris Mason 14471a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14482b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14491a419d85SLi Zefan } 14501a419d85SLi Zefan 145160ccf82fSDiego Calleja ret = defrag_count; 1452940100a4SChris Mason 14534cb5300bSChris Mason out_ra: 1454633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1455633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1456633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1457633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1458633085c7SFilipe David Borba Manana } 14594cb5300bSChris Mason if (!file) 14604cb5300bSChris Mason kfree(ra); 14614cb5300bSChris Mason kfree(pages); 1462940100a4SChris Mason return ret; 1463f46b5a66SChristoph Hellwig } 1464f46b5a66SChristoph Hellwig 1465198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 146676dda93cSYan, Zheng void __user *arg) 1467f46b5a66SChristoph Hellwig { 1468f46b5a66SChristoph Hellwig u64 new_size; 1469f46b5a66SChristoph Hellwig u64 old_size; 1470f46b5a66SChristoph Hellwig u64 devid = 1; 1471496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1472f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1473f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1474f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1475f46b5a66SChristoph Hellwig char *sizestr; 14769a40f122SGui Hecheng char *retptr; 1477f46b5a66SChristoph Hellwig char *devstr = NULL; 1478f46b5a66SChristoph Hellwig int ret = 0; 1479f46b5a66SChristoph Hellwig int mod = 0; 1480f46b5a66SChristoph Hellwig 1481e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1482e441d54dSChris Mason return -EPERM; 1483e441d54dSChris Mason 1484198605a8SMiao Xie ret = mnt_want_write_file(file); 1485198605a8SMiao Xie if (ret) 1486198605a8SMiao Xie return ret; 1487198605a8SMiao Xie 14885ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14895ac00addSStefan Behrens 1)) { 149097547676SMiao Xie mnt_drop_write_file(file); 1491e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1492c9e9f97bSIlya Dryomov } 1493c9e9f97bSIlya Dryomov 14945ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1495dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1496c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1497c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1498c9e9f97bSIlya Dryomov goto out; 1499c9e9f97bSIlya Dryomov } 15005516e595SMark Fasheh 15015516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1502f46b5a66SChristoph Hellwig 1503f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1504f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1505f46b5a66SChristoph Hellwig if (devstr) { 1506f46b5a66SChristoph Hellwig char *end; 1507f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1508f46b5a66SChristoph Hellwig *devstr = '\0'; 1509f46b5a66SChristoph Hellwig devstr = vol_args->name; 1510f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1511dfd79829SMiao Xie if (!devid) { 1512dfd79829SMiao Xie ret = -EINVAL; 1513dfd79829SMiao Xie goto out_free; 1514dfd79829SMiao Xie } 1515efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1516f46b5a66SChristoph Hellwig } 1517dba60f3fSMiao Xie 1518aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1519f46b5a66SChristoph Hellwig if (!device) { 1520efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1521c1c9ff7cSGeert Uytterhoeven devid); 1522dfd79829SMiao Xie ret = -ENODEV; 1523c9e9f97bSIlya Dryomov goto out_free; 1524f46b5a66SChristoph Hellwig } 1525dba60f3fSMiao Xie 1526dba60f3fSMiao Xie if (!device->writeable) { 1527efe120a0SFrank Holton btrfs_info(root->fs_info, 1528efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1529c1c9ff7cSGeert Uytterhoeven devid); 1530dfd79829SMiao Xie ret = -EPERM; 15314e42ae1bSLiu Bo goto out_free; 15324e42ae1bSLiu Bo } 15334e42ae1bSLiu Bo 1534f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1535f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1536f46b5a66SChristoph Hellwig else { 1537f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1538f46b5a66SChristoph Hellwig mod = -1; 1539f46b5a66SChristoph Hellwig sizestr++; 1540f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1541f46b5a66SChristoph Hellwig mod = 1; 1542f46b5a66SChristoph Hellwig sizestr++; 1543f46b5a66SChristoph Hellwig } 15449a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15459a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1546f46b5a66SChristoph Hellwig ret = -EINVAL; 1547c9e9f97bSIlya Dryomov goto out_free; 1548f46b5a66SChristoph Hellwig } 1549f46b5a66SChristoph Hellwig } 1550f46b5a66SChristoph Hellwig 155163a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1552dfd79829SMiao Xie ret = -EPERM; 155363a212abSStefan Behrens goto out_free; 155463a212abSStefan Behrens } 155563a212abSStefan Behrens 1556f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1557f46b5a66SChristoph Hellwig 1558f46b5a66SChristoph Hellwig if (mod < 0) { 1559f46b5a66SChristoph Hellwig if (new_size > old_size) { 1560f46b5a66SChristoph Hellwig ret = -EINVAL; 1561c9e9f97bSIlya Dryomov goto out_free; 1562f46b5a66SChristoph Hellwig } 1563f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1564f46b5a66SChristoph Hellwig } else if (mod > 0) { 1565eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1566eb8052e0SWenliang Fan ret = -EINVAL; 1567eb8052e0SWenliang Fan goto out_free; 1568eb8052e0SWenliang Fan } 1569f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1570f46b5a66SChristoph Hellwig } 1571f46b5a66SChristoph Hellwig 1572f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1573f46b5a66SChristoph Hellwig ret = -EINVAL; 1574c9e9f97bSIlya Dryomov goto out_free; 1575f46b5a66SChristoph Hellwig } 1576f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1577f46b5a66SChristoph Hellwig ret = -EFBIG; 1578c9e9f97bSIlya Dryomov goto out_free; 1579f46b5a66SChristoph Hellwig } 1580f46b5a66SChristoph Hellwig 1581f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1582f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1583f46b5a66SChristoph Hellwig 1584efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1585c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1586f46b5a66SChristoph Hellwig 1587f46b5a66SChristoph Hellwig if (new_size > old_size) { 1588a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 158998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 159098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1591c9e9f97bSIlya Dryomov goto out_free; 159298d5dc13STsutomu Itoh } 1593f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1594f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1595ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1596f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15970253f40eSjeff.liu } /* equal, nothing need to do */ 1598f46b5a66SChristoph Hellwig 1599c9e9f97bSIlya Dryomov out_free: 1600f46b5a66SChristoph Hellwig kfree(vol_args); 1601c9e9f97bSIlya Dryomov out: 1602c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16035ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 160418f39c41SIlya Dryomov mnt_drop_write_file(file); 1605f46b5a66SChristoph Hellwig return ret; 1606f46b5a66SChristoph Hellwig } 1607f46b5a66SChristoph Hellwig 160872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16096f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16106f72c7e2SArne Jansen u64 *transid, bool readonly, 16118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1612f46b5a66SChristoph Hellwig { 1613f46b5a66SChristoph Hellwig int namelen; 16143de4586cSChris Mason int ret = 0; 1615f46b5a66SChristoph Hellwig 1616a874a63eSLiu Bo ret = mnt_want_write_file(file); 1617a874a63eSLiu Bo if (ret) 1618a874a63eSLiu Bo goto out; 1619a874a63eSLiu Bo 162072fd032eSSage Weil namelen = strlen(name); 162172fd032eSSage Weil if (strchr(name, '/')) { 1622f46b5a66SChristoph Hellwig ret = -EINVAL; 1623a874a63eSLiu Bo goto out_drop_write; 1624f46b5a66SChristoph Hellwig } 1625f46b5a66SChristoph Hellwig 162616780cabSChris Mason if (name[0] == '.' && 162716780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 162816780cabSChris Mason ret = -EEXIST; 1629a874a63eSLiu Bo goto out_drop_write; 163016780cabSChris Mason } 163116780cabSChris Mason 16323de4586cSChris Mason if (subvol) { 163372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16346f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1635cb8e7090SChristoph Hellwig } else { 16362903ff01SAl Viro struct fd src = fdget(fd); 16373de4586cSChris Mason struct inode *src_inode; 16382903ff01SAl Viro if (!src.file) { 16393de4586cSChris Mason ret = -EINVAL; 1640a874a63eSLiu Bo goto out_drop_write; 16413de4586cSChris Mason } 16423de4586cSChris Mason 1643496ad9aaSAl Viro src_inode = file_inode(src.file); 1644496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1645efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1646efe120a0SFrank Holton "Snapshot src from another FS"); 164723ad5b17SKusanagi Kouichi ret = -EXDEV; 1648d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1649d0242061SDavid Sterba /* 1650d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1651d0242061SDavid Sterba * are limited to own subvolumes only 1652d0242061SDavid Sterba */ 1653d0242061SDavid Sterba ret = -EPERM; 1654ecd18815SAl Viro } else { 165572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 165672fd032eSSage Weil BTRFS_I(src_inode)->root, 16576f72c7e2SArne Jansen transid, readonly, inherit); 1658ecd18815SAl Viro } 16592903ff01SAl Viro fdput(src); 1660cb8e7090SChristoph Hellwig } 1661a874a63eSLiu Bo out_drop_write: 1662a874a63eSLiu Bo mnt_drop_write_file(file); 1663f46b5a66SChristoph Hellwig out: 166472fd032eSSage Weil return ret; 166572fd032eSSage Weil } 166672fd032eSSage Weil 166772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1668fa0d2b9bSLi Zefan void __user *arg, int subvol) 166972fd032eSSage Weil { 1670fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 167172fd032eSSage Weil int ret; 167272fd032eSSage Weil 1673fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1674fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1675fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1676fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1677fa0d2b9bSLi Zefan 1678fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1679b83cc969SLi Zefan vol_args->fd, subvol, 16806f72c7e2SArne Jansen NULL, false, NULL); 1681fa0d2b9bSLi Zefan 1682fa0d2b9bSLi Zefan kfree(vol_args); 1683fa0d2b9bSLi Zefan return ret; 1684fa0d2b9bSLi Zefan } 1685fa0d2b9bSLi Zefan 1686fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1687fa0d2b9bSLi Zefan void __user *arg, int subvol) 1688fa0d2b9bSLi Zefan { 1689fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1690fa0d2b9bSLi Zefan int ret; 1691fdfb1e4fSLi Zefan u64 transid = 0; 1692fdfb1e4fSLi Zefan u64 *ptr = NULL; 1693b83cc969SLi Zefan bool readonly = false; 16946f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 169572fd032eSSage Weil 1696fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1697fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1698fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1699fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1700fdfb1e4fSLi Zefan 1701b83cc969SLi Zefan if (vol_args->flags & 17026f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17036f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1704b83cc969SLi Zefan ret = -EOPNOTSUPP; 1705fdfb1e4fSLi Zefan goto out; 1706fdfb1e4fSLi Zefan } 1707fdfb1e4fSLi Zefan 1708fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1709fdfb1e4fSLi Zefan ptr = &transid; 1710b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1711b83cc969SLi Zefan readonly = true; 17126f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17136f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17146f72c7e2SArne Jansen ret = -EINVAL; 17156f72c7e2SArne Jansen goto out; 17166f72c7e2SArne Jansen } 17176f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17186f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17196f72c7e2SArne Jansen ret = PTR_ERR(inherit); 17206f72c7e2SArne Jansen goto out; 17216f72c7e2SArne Jansen } 17226f72c7e2SArne Jansen } 172375eaa0e2SSage Weil 1724fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17256f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17268696c533SMiao Xie readonly, inherit); 172775eaa0e2SSage Weil 1728fdfb1e4fSLi Zefan if (ret == 0 && ptr && 172975eaa0e2SSage Weil copy_to_user(arg + 1730fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1731fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 173275eaa0e2SSage Weil ret = -EFAULT; 1733fdfb1e4fSLi Zefan out: 1734f46b5a66SChristoph Hellwig kfree(vol_args); 17356f72c7e2SArne Jansen kfree(inherit); 1736f46b5a66SChristoph Hellwig return ret; 1737f46b5a66SChristoph Hellwig } 1738f46b5a66SChristoph Hellwig 17390caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17400caa102dSLi Zefan void __user *arg) 17410caa102dSLi Zefan { 1742496ad9aaSAl Viro struct inode *inode = file_inode(file); 17430caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17440caa102dSLi Zefan int ret = 0; 17450caa102dSLi Zefan u64 flags = 0; 17460caa102dSLi Zefan 174733345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17480caa102dSLi Zefan return -EINVAL; 17490caa102dSLi Zefan 17500caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17510caa102dSLi Zefan if (btrfs_root_readonly(root)) 17520caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17530caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17540caa102dSLi Zefan 17550caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17560caa102dSLi Zefan ret = -EFAULT; 17570caa102dSLi Zefan 17580caa102dSLi Zefan return ret; 17590caa102dSLi Zefan } 17600caa102dSLi Zefan 17610caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17620caa102dSLi Zefan void __user *arg) 17630caa102dSLi Zefan { 1764496ad9aaSAl Viro struct inode *inode = file_inode(file); 17650caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17660caa102dSLi Zefan struct btrfs_trans_handle *trans; 17670caa102dSLi Zefan u64 root_flags; 17680caa102dSLi Zefan u64 flags; 17690caa102dSLi Zefan int ret = 0; 17700caa102dSLi Zefan 1771bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1772bd60ea0fSDavid Sterba return -EPERM; 1773bd60ea0fSDavid Sterba 1774b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1775b9ca0664SLiu Bo if (ret) 1776b9ca0664SLiu Bo goto out; 17770caa102dSLi Zefan 1778b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1779b9ca0664SLiu Bo ret = -EINVAL; 1780b9ca0664SLiu Bo goto out_drop_write; 1781b9ca0664SLiu Bo } 17820caa102dSLi Zefan 1783b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1784b9ca0664SLiu Bo ret = -EFAULT; 1785b9ca0664SLiu Bo goto out_drop_write; 1786b9ca0664SLiu Bo } 17870caa102dSLi Zefan 1788b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1789b9ca0664SLiu Bo ret = -EINVAL; 1790b9ca0664SLiu Bo goto out_drop_write; 1791b9ca0664SLiu Bo } 17920caa102dSLi Zefan 1793b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1794b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1795b9ca0664SLiu Bo goto out_drop_write; 1796b9ca0664SLiu Bo } 17970caa102dSLi Zefan 17980caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17990caa102dSLi Zefan 18000caa102dSLi Zefan /* nothing to do */ 18010caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1802b9ca0664SLiu Bo goto out_drop_sem; 18030caa102dSLi Zefan 18040caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18052c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18060caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18070caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18082c686537SDavid Sterba } else { 18092c686537SDavid Sterba /* 18102c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18112c686537SDavid Sterba * send 18122c686537SDavid Sterba */ 18132c686537SDavid Sterba spin_lock(&root->root_item_lock); 18142c686537SDavid Sterba if (root->send_in_progress == 0) { 18150caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18160caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18172c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18182c686537SDavid Sterba } else { 18192c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18202c686537SDavid Sterba btrfs_warn(root->fs_info, 18212c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18222c686537SDavid Sterba root->root_key.objectid); 18232c686537SDavid Sterba ret = -EPERM; 18242c686537SDavid Sterba goto out_drop_sem; 18252c686537SDavid Sterba } 18262c686537SDavid Sterba } 18270caa102dSLi Zefan 18280caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18290caa102dSLi Zefan if (IS_ERR(trans)) { 18300caa102dSLi Zefan ret = PTR_ERR(trans); 18310caa102dSLi Zefan goto out_reset; 18320caa102dSLi Zefan } 18330caa102dSLi Zefan 1834b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18350caa102dSLi Zefan &root->root_key, &root->root_item); 18360caa102dSLi Zefan 18370caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18380caa102dSLi Zefan out_reset: 18390caa102dSLi Zefan if (ret) 18400caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1841b9ca0664SLiu Bo out_drop_sem: 18420caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1843b9ca0664SLiu Bo out_drop_write: 1844b9ca0664SLiu Bo mnt_drop_write_file(file); 1845b9ca0664SLiu Bo out: 18460caa102dSLi Zefan return ret; 18470caa102dSLi Zefan } 18480caa102dSLi Zefan 184976dda93cSYan, Zheng /* 185076dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 185176dda93cSYan, Zheng */ 185276dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 185376dda93cSYan, Zheng { 185476dda93cSYan, Zheng struct btrfs_path *path; 1855175a2b87SJosef Bacik struct btrfs_dir_item *di; 185676dda93cSYan, Zheng struct btrfs_key key; 1857175a2b87SJosef Bacik u64 dir_id; 185876dda93cSYan, Zheng int ret; 185976dda93cSYan, Zheng 186076dda93cSYan, Zheng path = btrfs_alloc_path(); 186176dda93cSYan, Zheng if (!path) 186276dda93cSYan, Zheng return -ENOMEM; 186376dda93cSYan, Zheng 1864175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1865175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1866175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1867175a2b87SJosef Bacik dir_id, "default", 7, 0); 1868175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1869175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1870175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 187172de6b53SGuangyu Sun ret = -EPERM; 187272de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 187372de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1874175a2b87SJosef Bacik goto out; 1875175a2b87SJosef Bacik } 1876175a2b87SJosef Bacik btrfs_release_path(path); 1877175a2b87SJosef Bacik } 1878175a2b87SJosef Bacik 187976dda93cSYan, Zheng key.objectid = root->root_key.objectid; 188076dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 188176dda93cSYan, Zheng key.offset = (u64)-1; 188276dda93cSYan, Zheng 188376dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 188476dda93cSYan, Zheng &key, path, 0, 0); 188576dda93cSYan, Zheng if (ret < 0) 188676dda93cSYan, Zheng goto out; 188776dda93cSYan, Zheng BUG_ON(ret == 0); 188876dda93cSYan, Zheng 188976dda93cSYan, Zheng ret = 0; 189076dda93cSYan, Zheng if (path->slots[0] > 0) { 189176dda93cSYan, Zheng path->slots[0]--; 189276dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 189376dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 189476dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 189576dda93cSYan, Zheng ret = -ENOTEMPTY; 189676dda93cSYan, Zheng } 189776dda93cSYan, Zheng out: 189876dda93cSYan, Zheng btrfs_free_path(path); 189976dda93cSYan, Zheng return ret; 190076dda93cSYan, Zheng } 190176dda93cSYan, Zheng 1902ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1903ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1904ac8e9819SChris Mason { 1905abc6e134SChris Mason struct btrfs_key test; 1906abc6e134SChris Mason int ret; 1907abc6e134SChris Mason 1908abc6e134SChris Mason test.objectid = sk->min_objectid; 1909abc6e134SChris Mason test.type = sk->min_type; 1910abc6e134SChris Mason test.offset = sk->min_offset; 1911abc6e134SChris Mason 1912abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1913abc6e134SChris Mason if (ret < 0) 1914ac8e9819SChris Mason return 0; 1915abc6e134SChris Mason 1916abc6e134SChris Mason test.objectid = sk->max_objectid; 1917abc6e134SChris Mason test.type = sk->max_type; 1918abc6e134SChris Mason test.offset = sk->max_offset; 1919abc6e134SChris Mason 1920abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1921abc6e134SChris Mason if (ret > 0) 1922ac8e9819SChris Mason return 0; 1923ac8e9819SChris Mason return 1; 1924ac8e9819SChris Mason } 1925ac8e9819SChris Mason 1926ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1927ac8e9819SChris Mason struct btrfs_path *path, 1928ac8e9819SChris Mason struct btrfs_key *key, 1929ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1930ac8e9819SChris Mason char *buf, 1931ac8e9819SChris Mason unsigned long *sk_offset, 1932ac8e9819SChris Mason int *num_found) 1933ac8e9819SChris Mason { 1934ac8e9819SChris Mason u64 found_transid; 1935ac8e9819SChris Mason struct extent_buffer *leaf; 1936ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1937ac8e9819SChris Mason unsigned long item_off; 1938ac8e9819SChris Mason unsigned long item_len; 1939ac8e9819SChris Mason int nritems; 1940ac8e9819SChris Mason int i; 1941ac8e9819SChris Mason int slot; 1942ac8e9819SChris Mason int ret = 0; 1943ac8e9819SChris Mason 1944ac8e9819SChris Mason leaf = path->nodes[0]; 1945ac8e9819SChris Mason slot = path->slots[0]; 1946ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1947ac8e9819SChris Mason 1948ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1949ac8e9819SChris Mason i = nritems; 1950ac8e9819SChris Mason goto advance_key; 1951ac8e9819SChris Mason } 1952ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1953ac8e9819SChris Mason 1954ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1955ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1956ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1957ac8e9819SChris Mason 195803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 195903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 196003b71c6cSGabriel de Perthuis continue; 196103b71c6cSGabriel de Perthuis 196203b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1963ac8e9819SChris Mason item_len = 0; 1964ac8e9819SChris Mason 1965ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1966ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1967ac8e9819SChris Mason ret = 1; 1968ac8e9819SChris Mason goto overflow; 1969ac8e9819SChris Mason } 1970ac8e9819SChris Mason 1971ac8e9819SChris Mason sh.objectid = key->objectid; 1972ac8e9819SChris Mason sh.offset = key->offset; 1973ac8e9819SChris Mason sh.type = key->type; 1974ac8e9819SChris Mason sh.len = item_len; 1975ac8e9819SChris Mason sh.transid = found_transid; 1976ac8e9819SChris Mason 1977ac8e9819SChris Mason /* copy search result header */ 1978ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1979ac8e9819SChris Mason *sk_offset += sizeof(sh); 1980ac8e9819SChris Mason 1981ac8e9819SChris Mason if (item_len) { 1982ac8e9819SChris Mason char *p = buf + *sk_offset; 1983ac8e9819SChris Mason /* copy the item */ 1984ac8e9819SChris Mason read_extent_buffer(leaf, p, 1985ac8e9819SChris Mason item_off, item_len); 1986ac8e9819SChris Mason *sk_offset += item_len; 1987ac8e9819SChris Mason } 1988e2156867SHugo Mills (*num_found)++; 1989ac8e9819SChris Mason 1990ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1991ac8e9819SChris Mason break; 1992ac8e9819SChris Mason } 1993ac8e9819SChris Mason advance_key: 1994ac8e9819SChris Mason ret = 0; 1995abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1996abc6e134SChris Mason key->offset++; 1997abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1998abc6e134SChris Mason key->offset = 0; 1999abc6e134SChris Mason key->type++; 2000abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 2001abc6e134SChris Mason key->offset = 0; 2002abc6e134SChris Mason key->type = 0; 2003abc6e134SChris Mason key->objectid++; 2004abc6e134SChris Mason } else 2005abc6e134SChris Mason ret = 1; 2006ac8e9819SChris Mason overflow: 2007ac8e9819SChris Mason return ret; 2008ac8e9819SChris Mason } 2009ac8e9819SChris Mason 2010ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 2011ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 2012ac8e9819SChris Mason { 2013ac8e9819SChris Mason struct btrfs_root *root; 2014ac8e9819SChris Mason struct btrfs_key key; 2015ac8e9819SChris Mason struct btrfs_path *path; 2016ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 2017ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2018ac8e9819SChris Mason int ret; 2019ac8e9819SChris Mason int num_found = 0; 2020ac8e9819SChris Mason unsigned long sk_offset = 0; 2021ac8e9819SChris Mason 2022ac8e9819SChris Mason path = btrfs_alloc_path(); 2023ac8e9819SChris Mason if (!path) 2024ac8e9819SChris Mason return -ENOMEM; 2025ac8e9819SChris Mason 2026ac8e9819SChris Mason if (sk->tree_id == 0) { 2027ac8e9819SChris Mason /* search the root of the inode that was passed */ 2028ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2029ac8e9819SChris Mason } else { 2030ac8e9819SChris Mason key.objectid = sk->tree_id; 2031ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2032ac8e9819SChris Mason key.offset = (u64)-1; 2033ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2034ac8e9819SChris Mason if (IS_ERR(root)) { 2035efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 2036ac8e9819SChris Mason sk->tree_id); 2037ac8e9819SChris Mason btrfs_free_path(path); 2038ac8e9819SChris Mason return -ENOENT; 2039ac8e9819SChris Mason } 2040ac8e9819SChris Mason } 2041ac8e9819SChris Mason 2042ac8e9819SChris Mason key.objectid = sk->min_objectid; 2043ac8e9819SChris Mason key.type = sk->min_type; 2044ac8e9819SChris Mason key.offset = sk->min_offset; 2045ac8e9819SChris Mason 2046ac8e9819SChris Mason path->keep_locks = 1; 2047ac8e9819SChris Mason 2048ac8e9819SChris Mason while (1) { 20496174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2050ac8e9819SChris Mason if (ret != 0) { 2051ac8e9819SChris Mason if (ret > 0) 2052ac8e9819SChris Mason ret = 0; 2053ac8e9819SChris Mason goto err; 2054ac8e9819SChris Mason } 2055ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 2056ac8e9819SChris Mason &sk_offset, &num_found); 2057b3b4aa74SDavid Sterba btrfs_release_path(path); 2058ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 2059ac8e9819SChris Mason break; 2060ac8e9819SChris Mason 2061ac8e9819SChris Mason } 2062ac8e9819SChris Mason ret = 0; 2063ac8e9819SChris Mason err: 2064ac8e9819SChris Mason sk->nr_items = num_found; 2065ac8e9819SChris Mason btrfs_free_path(path); 2066ac8e9819SChris Mason return ret; 2067ac8e9819SChris Mason } 2068ac8e9819SChris Mason 2069ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2070ac8e9819SChris Mason void __user *argp) 2071ac8e9819SChris Mason { 2072ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 2073ac8e9819SChris Mason struct inode *inode; 2074ac8e9819SChris Mason int ret; 2075ac8e9819SChris Mason 2076ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2077ac8e9819SChris Mason return -EPERM; 2078ac8e9819SChris Mason 20792354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20802354d08fSJulia Lawall if (IS_ERR(args)) 20812354d08fSJulia Lawall return PTR_ERR(args); 2082ac8e9819SChris Mason 2083496ad9aaSAl Viro inode = file_inode(file); 2084ac8e9819SChris Mason ret = search_ioctl(inode, args); 2085ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2086ac8e9819SChris Mason ret = -EFAULT; 2087ac8e9819SChris Mason kfree(args); 2088ac8e9819SChris Mason return ret; 2089ac8e9819SChris Mason } 2090ac8e9819SChris Mason 209198d377a0STARUISI Hiroaki /* 2092ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2093ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 209498d377a0STARUISI Hiroaki */ 209598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 209698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 209798d377a0STARUISI Hiroaki { 209898d377a0STARUISI Hiroaki struct btrfs_root *root; 209998d377a0STARUISI Hiroaki struct btrfs_key key; 2100ac8e9819SChris Mason char *ptr; 210198d377a0STARUISI Hiroaki int ret = -1; 210298d377a0STARUISI Hiroaki int slot; 210398d377a0STARUISI Hiroaki int len; 210498d377a0STARUISI Hiroaki int total_len = 0; 210598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 210698d377a0STARUISI Hiroaki struct extent_buffer *l; 210798d377a0STARUISI Hiroaki struct btrfs_path *path; 210898d377a0STARUISI Hiroaki 210998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 211098d377a0STARUISI Hiroaki name[0]='\0'; 211198d377a0STARUISI Hiroaki return 0; 211298d377a0STARUISI Hiroaki } 211398d377a0STARUISI Hiroaki 211498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 211598d377a0STARUISI Hiroaki if (!path) 211698d377a0STARUISI Hiroaki return -ENOMEM; 211798d377a0STARUISI Hiroaki 2118ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 211998d377a0STARUISI Hiroaki 212098d377a0STARUISI Hiroaki key.objectid = tree_id; 212198d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 212298d377a0STARUISI Hiroaki key.offset = (u64)-1; 212398d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 212498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2125efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 21268ad6fcabSChris Mason ret = -ENOENT; 21278ad6fcabSChris Mason goto out; 212898d377a0STARUISI Hiroaki } 212998d377a0STARUISI Hiroaki 213098d377a0STARUISI Hiroaki key.objectid = dirid; 213198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 21328ad6fcabSChris Mason key.offset = (u64)-1; 213398d377a0STARUISI Hiroaki 213498d377a0STARUISI Hiroaki while (1) { 213598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 213698d377a0STARUISI Hiroaki if (ret < 0) 213798d377a0STARUISI Hiroaki goto out; 213818674c6cSFilipe David Borba Manana else if (ret > 0) { 213918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 214018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 214118674c6cSFilipe David Borba Manana if (ret < 0) 214218674c6cSFilipe David Borba Manana goto out; 214318674c6cSFilipe David Borba Manana else if (ret > 0) { 2144ac8e9819SChris Mason ret = -ENOENT; 214598d377a0STARUISI Hiroaki goto out; 2146ac8e9819SChris Mason } 214718674c6cSFilipe David Borba Manana } 214818674c6cSFilipe David Borba Manana 214918674c6cSFilipe David Borba Manana l = path->nodes[0]; 215018674c6cSFilipe David Borba Manana slot = path->slots[0]; 215118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 215298d377a0STARUISI Hiroaki 215398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 215498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 215598d377a0STARUISI Hiroaki ptr -= len + 1; 215698d377a0STARUISI Hiroaki total_len += len + 1; 2157a696cf35SFilipe David Borba Manana if (ptr < name) { 2158a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 215998d377a0STARUISI Hiroaki goto out; 2160a696cf35SFilipe David Borba Manana } 216198d377a0STARUISI Hiroaki 216298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 216398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 216498d377a0STARUISI Hiroaki 216598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 216698d377a0STARUISI Hiroaki break; 216798d377a0STARUISI Hiroaki 2168b3b4aa74SDavid Sterba btrfs_release_path(path); 216998d377a0STARUISI Hiroaki key.objectid = key.offset; 21708ad6fcabSChris Mason key.offset = (u64)-1; 217198d377a0STARUISI Hiroaki dirid = key.objectid; 217298d377a0STARUISI Hiroaki } 217377906a50SLi Zefan memmove(name, ptr, total_len); 217498d377a0STARUISI Hiroaki name[total_len] = '\0'; 217598d377a0STARUISI Hiroaki ret = 0; 217698d377a0STARUISI Hiroaki out: 217798d377a0STARUISI Hiroaki btrfs_free_path(path); 2178ac8e9819SChris Mason return ret; 2179ac8e9819SChris Mason } 2180ac8e9819SChris Mason 2181ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2182ac8e9819SChris Mason void __user *argp) 2183ac8e9819SChris Mason { 2184ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2185ac8e9819SChris Mason struct inode *inode; 2186ac8e9819SChris Mason int ret; 2187ac8e9819SChris Mason 2188ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2189ac8e9819SChris Mason return -EPERM; 2190ac8e9819SChris Mason 21912354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 21922354d08fSJulia Lawall if (IS_ERR(args)) 21932354d08fSJulia Lawall return PTR_ERR(args); 2194c2b96929SDan Carpenter 2195496ad9aaSAl Viro inode = file_inode(file); 2196ac8e9819SChris Mason 21971b53ac4dSChris Mason if (args->treeid == 0) 21981b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 21991b53ac4dSChris Mason 2200ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2201ac8e9819SChris Mason args->treeid, args->objectid, 2202ac8e9819SChris Mason args->name); 2203ac8e9819SChris Mason 2204ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2205ac8e9819SChris Mason ret = -EFAULT; 2206ac8e9819SChris Mason 2207ac8e9819SChris Mason kfree(args); 220898d377a0STARUISI Hiroaki return ret; 220998d377a0STARUISI Hiroaki } 221098d377a0STARUISI Hiroaki 221176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 221276dda93cSYan, Zheng void __user *arg) 221376dda93cSYan, Zheng { 221454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 221576dda93cSYan, Zheng struct dentry *dentry; 221676dda93cSYan, Zheng struct inode *dir = parent->d_inode; 221776dda93cSYan, Zheng struct inode *inode; 221876dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 221976dda93cSYan, Zheng struct btrfs_root *dest = NULL; 222076dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 222176dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2222c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2223521e0546SDavid Sterba u64 root_flags; 2224c58aaad2SMiao Xie u64 qgroup_reserved; 222576dda93cSYan, Zheng int namelen; 222676dda93cSYan, Zheng int ret; 222776dda93cSYan, Zheng int err = 0; 222876dda93cSYan, Zheng 222976dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 223076dda93cSYan, Zheng if (IS_ERR(vol_args)) 223176dda93cSYan, Zheng return PTR_ERR(vol_args); 223276dda93cSYan, Zheng 223376dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 223476dda93cSYan, Zheng namelen = strlen(vol_args->name); 223576dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 223676dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 223776dda93cSYan, Zheng err = -EINVAL; 223876dda93cSYan, Zheng goto out; 223976dda93cSYan, Zheng } 224076dda93cSYan, Zheng 2241a561be71SAl Viro err = mnt_want_write_file(file); 224276dda93cSYan, Zheng if (err) 224376dda93cSYan, Zheng goto out; 224476dda93cSYan, Zheng 2245521e0546SDavid Sterba 22465c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 22475c50c9b8SDavid Sterba if (err == -EINTR) 2248e43f998eSDavid Sterba goto out_drop_write; 224976dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 225076dda93cSYan, Zheng if (IS_ERR(dentry)) { 225176dda93cSYan, Zheng err = PTR_ERR(dentry); 225276dda93cSYan, Zheng goto out_unlock_dir; 225376dda93cSYan, Zheng } 225476dda93cSYan, Zheng 225576dda93cSYan, Zheng if (!dentry->d_inode) { 225676dda93cSYan, Zheng err = -ENOENT; 225776dda93cSYan, Zheng goto out_dput; 225876dda93cSYan, Zheng } 225976dda93cSYan, Zheng 226076dda93cSYan, Zheng inode = dentry->d_inode; 22614260f7c7SSage Weil dest = BTRFS_I(inode)->root; 22624260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 22634260f7c7SSage Weil /* 22644260f7c7SSage Weil * Regular user. Only allow this with a special mount 22654260f7c7SSage Weil * option, when the user has write+exec access to the 22664260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 22674260f7c7SSage Weil * allowed. 22684260f7c7SSage Weil * 22694260f7c7SSage Weil * Note that this is _not_ check that the subvol is 22704260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 22714260f7c7SSage Weil * otherwise be able to delete. 22724260f7c7SSage Weil * 22734260f7c7SSage Weil * Users who want to delete empty subvols should try 22744260f7c7SSage Weil * rmdir(2). 22754260f7c7SSage Weil */ 22764260f7c7SSage Weil err = -EPERM; 22774260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 22784260f7c7SSage Weil goto out_dput; 22794260f7c7SSage Weil 22804260f7c7SSage Weil /* 22814260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 22824260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 22834260f7c7SSage Weil * must be called on the dentry referencing the root 22844260f7c7SSage Weil * of the subvol, not a random directory contained 22854260f7c7SSage Weil * within it. 22864260f7c7SSage Weil */ 22874260f7c7SSage Weil err = -EINVAL; 22884260f7c7SSage Weil if (root == dest) 22894260f7c7SSage Weil goto out_dput; 22904260f7c7SSage Weil 22914260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 22924260f7c7SSage Weil if (err) 22934260f7c7SSage Weil goto out_dput; 22945c39da5bSMiao Xie } 22954260f7c7SSage Weil 22965c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 22974260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 22984260f7c7SSage Weil if (err) 22994260f7c7SSage Weil goto out_dput; 23004260f7c7SSage Weil 230133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 230276dda93cSYan, Zheng err = -EINVAL; 230376dda93cSYan, Zheng goto out_dput; 230476dda93cSYan, Zheng } 230576dda93cSYan, Zheng 230676dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 2307521e0546SDavid Sterba 2308521e0546SDavid Sterba /* 2309521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2310521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2311521e0546SDavid Sterba * again is not run concurrently. 2312521e0546SDavid Sterba */ 2313521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2314521e0546SDavid Sterba root_flags = btrfs_root_flags(&root->root_item); 2315521e0546SDavid Sterba if (root->send_in_progress == 0) { 2316521e0546SDavid Sterba btrfs_set_root_flags(&root->root_item, 2317521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2318521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2319521e0546SDavid Sterba } else { 2320521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2321521e0546SDavid Sterba btrfs_warn(root->fs_info, 2322521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2323521e0546SDavid Sterba root->root_key.objectid); 2324521e0546SDavid Sterba err = -EPERM; 2325521e0546SDavid Sterba goto out_dput; 2326521e0546SDavid Sterba } 2327521e0546SDavid Sterba 232876dda93cSYan, Zheng err = d_invalidate(dentry); 232976dda93cSYan, Zheng if (err) 233076dda93cSYan, Zheng goto out_unlock; 233176dda93cSYan, Zheng 233276dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 233376dda93cSYan, Zheng 233476dda93cSYan, Zheng err = may_destroy_subvol(dest); 233576dda93cSYan, Zheng if (err) 233676dda93cSYan, Zheng goto out_up_write; 233776dda93cSYan, Zheng 2338c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2339c58aaad2SMiao Xie /* 2340c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2341c58aaad2SMiao Xie * ref/backref. 2342c58aaad2SMiao Xie */ 2343c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2344ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2345c58aaad2SMiao Xie if (err) 2346c58aaad2SMiao Xie goto out_up_write; 2347c58aaad2SMiao Xie 2348a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2349a22285a6SYan, Zheng if (IS_ERR(trans)) { 2350a22285a6SYan, Zheng err = PTR_ERR(trans); 2351c58aaad2SMiao Xie goto out_release; 2352a22285a6SYan, Zheng } 2353c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2354c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2355a22285a6SYan, Zheng 235676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 235776dda93cSYan, Zheng dest->root_key.objectid, 235876dda93cSYan, Zheng dentry->d_name.name, 235976dda93cSYan, Zheng dentry->d_name.len); 236079787eaaSJeff Mahoney if (ret) { 236179787eaaSJeff Mahoney err = ret; 236279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 236379787eaaSJeff Mahoney goto out_end_trans; 236479787eaaSJeff Mahoney } 236576dda93cSYan, Zheng 236676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 236776dda93cSYan, Zheng 236876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 236976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 237076dda93cSYan, Zheng dest->root_item.drop_level = 0; 237176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 237276dda93cSYan, Zheng 237327cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 237476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 237576dda93cSYan, Zheng root->fs_info->tree_root, 237676dda93cSYan, Zheng dest->root_key.objectid); 237779787eaaSJeff Mahoney if (ret) { 237879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 237979787eaaSJeff Mahoney err = ret; 238079787eaaSJeff Mahoney goto out_end_trans; 2381d68fc57bSYan, Zheng } 238279787eaaSJeff Mahoney } 2383dd5f9615SStefan Behrens 2384dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2385dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2386dd5f9615SStefan Behrens dest->root_key.objectid); 2387dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2388dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2389dd5f9615SStefan Behrens err = ret; 2390dd5f9615SStefan Behrens goto out_end_trans; 2391dd5f9615SStefan Behrens } 2392dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2393dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2394dd5f9615SStefan Behrens dest->root_item.received_uuid, 2395dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2396dd5f9615SStefan Behrens dest->root_key.objectid); 2397dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2398dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2399dd5f9615SStefan Behrens err = ret; 2400dd5f9615SStefan Behrens goto out_end_trans; 2401dd5f9615SStefan Behrens } 2402dd5f9615SStefan Behrens } 2403dd5f9615SStefan Behrens 240479787eaaSJeff Mahoney out_end_trans: 2405c58aaad2SMiao Xie trans->block_rsv = NULL; 2406c58aaad2SMiao Xie trans->bytes_reserved = 0; 2407531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 240879787eaaSJeff Mahoney if (ret && !err) 240979787eaaSJeff Mahoney err = ret; 241076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2411c58aaad2SMiao Xie out_release: 2412c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 241376dda93cSYan, Zheng out_up_write: 241476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 241576dda93cSYan, Zheng out_unlock: 2416521e0546SDavid Sterba if (err) { 2417521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2418521e0546SDavid Sterba root_flags = btrfs_root_flags(&root->root_item); 2419521e0546SDavid Sterba btrfs_set_root_flags(&root->root_item, 2420521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2421521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2422521e0546SDavid Sterba } 242376dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 242476dda93cSYan, Zheng if (!err) { 2425efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 242676dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 242776dda93cSYan, Zheng d_delete(dentry); 242861155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2429fa6ac876SLiu Bo 2430fa6ac876SLiu Bo /* the last ref */ 2431fa6ac876SLiu Bo if (dest->cache_inode) { 2432fa6ac876SLiu Bo iput(dest->cache_inode); 2433fa6ac876SLiu Bo dest->cache_inode = NULL; 2434fa6ac876SLiu Bo } 243576dda93cSYan, Zheng } 243676dda93cSYan, Zheng out_dput: 243776dda93cSYan, Zheng dput(dentry); 243876dda93cSYan, Zheng out_unlock_dir: 243976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2440e43f998eSDavid Sterba out_drop_write: 24412a79f17eSAl Viro mnt_drop_write_file(file); 244276dda93cSYan, Zheng out: 244376dda93cSYan, Zheng kfree(vol_args); 244476dda93cSYan, Zheng return err; 244576dda93cSYan, Zheng } 244676dda93cSYan, Zheng 24471e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2448f46b5a66SChristoph Hellwig { 2449496ad9aaSAl Viro struct inode *inode = file_inode(file); 2450f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 24511e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2452c146afadSYan Zheng int ret; 2453c146afadSYan Zheng 245425122d15SIlya Dryomov ret = mnt_want_write_file(file); 245525122d15SIlya Dryomov if (ret) 245625122d15SIlya Dryomov return ret; 2457b83cc969SLi Zefan 245825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 245925122d15SIlya Dryomov ret = -EROFS; 246025122d15SIlya Dryomov goto out; 24615ac00addSStefan Behrens } 2462f46b5a66SChristoph Hellwig 2463f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2464f46b5a66SChristoph Hellwig case S_IFDIR: 2465e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2466e441d54dSChris Mason ret = -EPERM; 2467e441d54dSChris Mason goto out; 2468e441d54dSChris Mason } 2469de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 24708929ecfaSYan, Zheng if (ret) 24718929ecfaSYan, Zheng goto out; 2472de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2473f46b5a66SChristoph Hellwig break; 2474f46b5a66SChristoph Hellwig case S_IFREG: 2475e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2476e441d54dSChris Mason ret = -EINVAL; 2477e441d54dSChris Mason goto out; 2478e441d54dSChris Mason } 24791e701a32SChris Mason 24801e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 24811e701a32SChris Mason if (!range) { 24821e701a32SChris Mason ret = -ENOMEM; 24831e701a32SChris Mason goto out; 24841e701a32SChris Mason } 24851e701a32SChris Mason 24861e701a32SChris Mason if (argp) { 24871e701a32SChris Mason if (copy_from_user(range, argp, 24881e701a32SChris Mason sizeof(*range))) { 24891e701a32SChris Mason ret = -EFAULT; 24901e701a32SChris Mason kfree(range); 2491683be16eSDan Carpenter goto out; 24921e701a32SChris Mason } 24931e701a32SChris Mason /* compression requires us to start the IO */ 24941e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 24951e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 24961e701a32SChris Mason range->extent_thresh = (u32)-1; 24971e701a32SChris Mason } 24981e701a32SChris Mason } else { 24991e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 25001e701a32SChris Mason range->len = (u64)-1; 25011e701a32SChris Mason } 2502496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 25034cb5300bSChris Mason range, 0, 0); 25044cb5300bSChris Mason if (ret > 0) 25054cb5300bSChris Mason ret = 0; 25061e701a32SChris Mason kfree(range); 2507f46b5a66SChristoph Hellwig break; 25088929ecfaSYan, Zheng default: 25098929ecfaSYan, Zheng ret = -EINVAL; 2510f46b5a66SChristoph Hellwig } 2511e441d54dSChris Mason out: 251225122d15SIlya Dryomov mnt_drop_write_file(file); 2513e441d54dSChris Mason return ret; 2514f46b5a66SChristoph Hellwig } 2515f46b5a66SChristoph Hellwig 2516b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2517f46b5a66SChristoph Hellwig { 2518f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2519f46b5a66SChristoph Hellwig int ret; 2520f46b5a66SChristoph Hellwig 2521e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2522e441d54dSChris Mason return -EPERM; 2523e441d54dSChris Mason 25245ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 25255ac00addSStefan Behrens 1)) { 2526e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2527c9e9f97bSIlya Dryomov } 2528c9e9f97bSIlya Dryomov 25295ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2530dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2531c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2532c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2533c9e9f97bSIlya Dryomov goto out; 2534c9e9f97bSIlya Dryomov } 2535f46b5a66SChristoph Hellwig 25365516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2537f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2538f46b5a66SChristoph Hellwig 2539f46b5a66SChristoph Hellwig kfree(vol_args); 2540c9e9f97bSIlya Dryomov out: 2541c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 25425ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2543f46b5a66SChristoph Hellwig return ret; 2544f46b5a66SChristoph Hellwig } 2545f46b5a66SChristoph Hellwig 2546da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2547f46b5a66SChristoph Hellwig { 2548496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2549f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2550f46b5a66SChristoph Hellwig int ret; 2551f46b5a66SChristoph Hellwig 2552e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2553e441d54dSChris Mason return -EPERM; 2554e441d54dSChris Mason 2555da24927bSMiao Xie ret = mnt_want_write_file(file); 2556da24927bSMiao Xie if (ret) 2557da24927bSMiao Xie return ret; 2558c146afadSYan Zheng 2559dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2560c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2561c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2562c9e9f97bSIlya Dryomov goto out; 2563c9e9f97bSIlya Dryomov } 2564f46b5a66SChristoph Hellwig 25655516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2566f46b5a66SChristoph Hellwig 2567183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2568183860f6SAnand Jain 1)) { 2569183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2570183860f6SAnand Jain goto out; 2571183860f6SAnand Jain } 2572183860f6SAnand Jain 2573183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2574183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2575c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 25765ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2577183860f6SAnand Jain 2578183860f6SAnand Jain out: 2579183860f6SAnand Jain kfree(vol_args); 25804ac20c70SIlya Dryomov mnt_drop_write_file(file); 2581f46b5a66SChristoph Hellwig return ret; 2582f46b5a66SChristoph Hellwig } 2583f46b5a66SChristoph Hellwig 2584475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2585475f6387SJan Schmidt { 2586027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2587475f6387SJan Schmidt struct btrfs_device *device; 2588475f6387SJan Schmidt struct btrfs_device *next; 2589475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2590027ed2f0SLi Zefan int ret = 0; 2591475f6387SJan Schmidt 2592027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2593027ed2f0SLi Zefan if (!fi_args) 2594027ed2f0SLi Zefan return -ENOMEM; 2595027ed2f0SLi Zefan 2596f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2597027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2598027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2599475f6387SJan Schmidt 2600475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2601027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2602027ed2f0SLi Zefan fi_args->max_id = device->devid; 2603475f6387SJan Schmidt } 2604475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2605475f6387SJan Schmidt 260680a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 260780a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 260880a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 260980a773fbSDavid Sterba 2610027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2611027ed2f0SLi Zefan ret = -EFAULT; 2612475f6387SJan Schmidt 2613027ed2f0SLi Zefan kfree(fi_args); 2614027ed2f0SLi Zefan return ret; 2615475f6387SJan Schmidt } 2616475f6387SJan Schmidt 2617475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2618475f6387SJan Schmidt { 2619475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2620475f6387SJan Schmidt struct btrfs_device *dev; 2621475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2622475f6387SJan Schmidt int ret = 0; 2623475f6387SJan Schmidt char *s_uuid = NULL; 2624475f6387SJan Schmidt 2625475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2626475f6387SJan Schmidt if (IS_ERR(di_args)) 2627475f6387SJan Schmidt return PTR_ERR(di_args); 2628475f6387SJan Schmidt 2629dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2630475f6387SJan Schmidt s_uuid = di_args->uuid; 2631475f6387SJan Schmidt 2632475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2633aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2634475f6387SJan Schmidt 2635475f6387SJan Schmidt if (!dev) { 2636475f6387SJan Schmidt ret = -ENODEV; 2637475f6387SJan Schmidt goto out; 2638475f6387SJan Schmidt } 2639475f6387SJan Schmidt 2640475f6387SJan Schmidt di_args->devid = dev->devid; 2641475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2642475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2643475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2644a27202fbSJim Meyering if (dev->name) { 2645606686eeSJosef Bacik struct rcu_string *name; 2646606686eeSJosef Bacik 2647606686eeSJosef Bacik rcu_read_lock(); 2648606686eeSJosef Bacik name = rcu_dereference(dev->name); 2649606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2650606686eeSJosef Bacik rcu_read_unlock(); 2651a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2652a27202fbSJim Meyering } else { 265399ba55adSStefan Behrens di_args->path[0] = '\0'; 2654a27202fbSJim Meyering } 2655475f6387SJan Schmidt 2656475f6387SJan Schmidt out: 265755793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2658475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2659475f6387SJan Schmidt ret = -EFAULT; 2660475f6387SJan Schmidt 2661475f6387SJan Schmidt kfree(di_args); 2662475f6387SJan Schmidt return ret; 2663475f6387SJan Schmidt } 2664475f6387SJan Schmidt 2665416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2666416161dbSMark Fasheh { 2667416161dbSMark Fasheh struct page *page; 2668416161dbSMark Fasheh pgoff_t index; 2669416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2670416161dbSMark Fasheh 2671416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2672416161dbSMark Fasheh 2673416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2674416161dbSMark Fasheh if (!page) 2675416161dbSMark Fasheh return NULL; 2676416161dbSMark Fasheh 2677416161dbSMark Fasheh if (!PageUptodate(page)) { 2678416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2679416161dbSMark Fasheh 0)) 2680416161dbSMark Fasheh return NULL; 2681416161dbSMark Fasheh lock_page(page); 2682416161dbSMark Fasheh if (!PageUptodate(page)) { 2683416161dbSMark Fasheh unlock_page(page); 2684416161dbSMark Fasheh page_cache_release(page); 2685416161dbSMark Fasheh return NULL; 2686416161dbSMark Fasheh } 2687416161dbSMark Fasheh } 2688416161dbSMark Fasheh unlock_page(page); 2689416161dbSMark Fasheh 2690416161dbSMark Fasheh return page; 2691416161dbSMark Fasheh } 2692416161dbSMark Fasheh 269377fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 269477fe20dcSMark Fasheh { 269577fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 269677fe20dcSMark Fasheh another, and lock file content */ 269777fe20dcSMark Fasheh while (1) { 269877fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 269977fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 270077fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 270177fe20dcSMark Fasheh off + len - 1); 270277fe20dcSMark Fasheh if (!ordered && 270377fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 270477fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 270577fe20dcSMark Fasheh break; 270677fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 270777fe20dcSMark Fasheh if (ordered) 270877fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 270977fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 271077fe20dcSMark Fasheh } 271177fe20dcSMark Fasheh } 271277fe20dcSMark Fasheh 2713416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2714416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2715416161dbSMark Fasheh { 2716416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2717416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2718416161dbSMark Fasheh 2719416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2720416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2721416161dbSMark Fasheh } 2722416161dbSMark Fasheh 2723416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2724416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2725416161dbSMark Fasheh { 2726416161dbSMark Fasheh if (inode1 < inode2) { 2727416161dbSMark Fasheh swap(inode1, inode2); 2728416161dbSMark Fasheh swap(loff1, loff2); 2729416161dbSMark Fasheh } 2730416161dbSMark Fasheh 2731416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2732416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2733416161dbSMark Fasheh if (inode1 != inode2) { 2734416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2735416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2736416161dbSMark Fasheh } 2737416161dbSMark Fasheh } 2738416161dbSMark Fasheh 2739416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2740416161dbSMark Fasheh u64 dst_loff, u64 len) 2741416161dbSMark Fasheh { 2742416161dbSMark Fasheh int ret = 0; 2743416161dbSMark Fasheh struct page *src_page, *dst_page; 2744416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2745416161dbSMark Fasheh void *addr, *dst_addr; 2746416161dbSMark Fasheh 2747416161dbSMark Fasheh while (len) { 2748416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2749416161dbSMark Fasheh cmp_len = len; 2750416161dbSMark Fasheh 2751416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2752416161dbSMark Fasheh if (!src_page) 2753416161dbSMark Fasheh return -EINVAL; 2754416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2755416161dbSMark Fasheh if (!dst_page) { 2756416161dbSMark Fasheh page_cache_release(src_page); 2757416161dbSMark Fasheh return -EINVAL; 2758416161dbSMark Fasheh } 2759416161dbSMark Fasheh addr = kmap_atomic(src_page); 2760416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2761416161dbSMark Fasheh 2762416161dbSMark Fasheh flush_dcache_page(src_page); 2763416161dbSMark Fasheh flush_dcache_page(dst_page); 2764416161dbSMark Fasheh 2765416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2766416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2767416161dbSMark Fasheh 2768416161dbSMark Fasheh kunmap_atomic(addr); 2769416161dbSMark Fasheh kunmap_atomic(dst_addr); 2770416161dbSMark Fasheh page_cache_release(src_page); 2771416161dbSMark Fasheh page_cache_release(dst_page); 2772416161dbSMark Fasheh 2773416161dbSMark Fasheh if (ret) 2774416161dbSMark Fasheh break; 2775416161dbSMark Fasheh 2776416161dbSMark Fasheh loff += cmp_len; 2777416161dbSMark Fasheh dst_loff += cmp_len; 2778416161dbSMark Fasheh len -= cmp_len; 2779416161dbSMark Fasheh } 2780416161dbSMark Fasheh 2781416161dbSMark Fasheh return ret; 2782416161dbSMark Fasheh } 2783416161dbSMark Fasheh 2784416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2785416161dbSMark Fasheh { 2786416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2787416161dbSMark Fasheh 2788416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2789416161dbSMark Fasheh return -EINVAL; 2790416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2791416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2792416161dbSMark Fasheh return -EINVAL; 2793416161dbSMark Fasheh 2794416161dbSMark Fasheh return 0; 2795416161dbSMark Fasheh } 2796416161dbSMark Fasheh 2797416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2798416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2799416161dbSMark Fasheh { 2800416161dbSMark Fasheh int ret; 2801416161dbSMark Fasheh 2802416161dbSMark Fasheh /* 2803416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2804416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2805416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2806416161dbSMark Fasheh */ 2807416161dbSMark Fasheh if (src == dst) 2808416161dbSMark Fasheh return -EINVAL; 2809416161dbSMark Fasheh 2810416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2811416161dbSMark Fasheh 2812416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2813416161dbSMark Fasheh if (ret) 2814416161dbSMark Fasheh goto out_unlock; 2815416161dbSMark Fasheh 2816416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2817416161dbSMark Fasheh if (ret) 2818416161dbSMark Fasheh goto out_unlock; 2819416161dbSMark Fasheh 2820416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2821416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2822416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2823416161dbSMark Fasheh ret = -EINVAL; 2824416161dbSMark Fasheh goto out_unlock; 2825416161dbSMark Fasheh } 2826416161dbSMark Fasheh 2827416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2828416161dbSMark Fasheh if (ret == 0) 2829416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2830416161dbSMark Fasheh 2831416161dbSMark Fasheh out_unlock: 2832416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2833416161dbSMark Fasheh 2834416161dbSMark Fasheh return ret; 2835416161dbSMark Fasheh } 2836416161dbSMark Fasheh 2837416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2838416161dbSMark Fasheh 2839416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 28401c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 2841416161dbSMark Fasheh { 2842cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2843cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 28441c1c8747SAl Viro struct inode *src = file_inode(file); 2845416161dbSMark Fasheh u64 off; 2846416161dbSMark Fasheh u64 len; 2847416161dbSMark Fasheh int i; 2848416161dbSMark Fasheh int ret; 2849cbf8b8caSMark Fasheh unsigned long size; 2850416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2851416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 28521c1c8747SAl Viro u16 count; 2853416161dbSMark Fasheh 2854416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2855416161dbSMark Fasheh return -EINVAL; 2856416161dbSMark Fasheh 2857416161dbSMark Fasheh ret = mnt_want_write_file(file); 2858416161dbSMark Fasheh if (ret) 2859416161dbSMark Fasheh return ret; 2860416161dbSMark Fasheh 28611c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 2862416161dbSMark Fasheh ret = -EFAULT; 2863416161dbSMark Fasheh goto out; 2864416161dbSMark Fasheh } 2865416161dbSMark Fasheh 28661c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 2867cbf8b8caSMark Fasheh 28681c1c8747SAl Viro same = memdup_user(argp, size); 2869cbf8b8caSMark Fasheh 2870229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2871229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2872cbf8b8caSMark Fasheh goto out; 2873cbf8b8caSMark Fasheh } 2874cbf8b8caSMark Fasheh 2875cbf8b8caSMark Fasheh off = same->logical_offset; 2876cbf8b8caSMark Fasheh len = same->length; 2877416161dbSMark Fasheh 2878416161dbSMark Fasheh /* 2879416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2880416161dbSMark Fasheh * This is intended to bound the total time spent in this 2881416161dbSMark Fasheh * ioctl to something sane. 2882416161dbSMark Fasheh */ 2883416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2884416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2885416161dbSMark Fasheh 2886416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2887416161dbSMark Fasheh /* 2888416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2889416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2890416161dbSMark Fasheh * this situation without an update. 2891416161dbSMark Fasheh */ 2892416161dbSMark Fasheh ret = -EINVAL; 2893416161dbSMark Fasheh goto out; 2894416161dbSMark Fasheh } 2895416161dbSMark Fasheh 2896416161dbSMark Fasheh ret = -EISDIR; 2897416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2898416161dbSMark Fasheh goto out; 2899416161dbSMark Fasheh 2900416161dbSMark Fasheh ret = -EACCES; 2901416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2902416161dbSMark Fasheh goto out; 2903416161dbSMark Fasheh 2904cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 29051c1c8747SAl Viro for (i = 0; i < count; i++) { 2906cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2907cbf8b8caSMark Fasheh same->info[i].status = 0; 2908416161dbSMark Fasheh } 2909416161dbSMark Fasheh 29101c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 29111c1c8747SAl Viro struct inode *dst; 29121c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 29131c1c8747SAl Viro if (!dst_file.file) { 2914cbf8b8caSMark Fasheh info->status = -EBADF; 29151c1c8747SAl Viro continue; 2916416161dbSMark Fasheh } 29171c1c8747SAl Viro dst = file_inode(dst_file.file); 2918416161dbSMark Fasheh 29191c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 2920cbf8b8caSMark Fasheh info->status = -EINVAL; 29211c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 2922cbf8b8caSMark Fasheh info->status = -EXDEV; 29231c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 2924cbf8b8caSMark Fasheh info->status = -EISDIR; 29251c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 2926cbf8b8caSMark Fasheh info->status = -EACCES; 29271c1c8747SAl Viro } else { 2928cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2929cbf8b8caSMark Fasheh info->logical_offset); 2930cbf8b8caSMark Fasheh if (info->status == 0) 2931cbf8b8caSMark Fasheh info->bytes_deduped += len; 29321c1c8747SAl Viro } 29331c1c8747SAl Viro fdput(dst_file); 2934cbf8b8caSMark Fasheh } 2935416161dbSMark Fasheh 2936cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2937cbf8b8caSMark Fasheh if (ret) 2938416161dbSMark Fasheh ret = -EFAULT; 2939416161dbSMark Fasheh 2940416161dbSMark Fasheh out: 2941416161dbSMark Fasheh mnt_drop_write_file(file); 2942416161dbSMark Fasheh return ret; 2943416161dbSMark Fasheh } 2944416161dbSMark Fasheh 2945*fcebe456SJosef Bacik /* Helper to check and see if this root currently has a ref on the given disk 2946*fcebe456SJosef Bacik * bytenr. If it does then we need to update the quota for this root. This 2947*fcebe456SJosef Bacik * doesn't do anything if quotas aren't enabled. 2948*fcebe456SJosef Bacik */ 2949*fcebe456SJosef Bacik static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2950*fcebe456SJosef Bacik u64 disko) 2951*fcebe456SJosef Bacik { 2952*fcebe456SJosef Bacik struct seq_list tree_mod_seq_elem = {}; 2953*fcebe456SJosef Bacik struct ulist *roots; 2954*fcebe456SJosef Bacik struct ulist_iterator uiter; 2955*fcebe456SJosef Bacik struct ulist_node *root_node = NULL; 2956*fcebe456SJosef Bacik int ret; 2957*fcebe456SJosef Bacik 2958*fcebe456SJosef Bacik if (!root->fs_info->quota_enabled) 2959*fcebe456SJosef Bacik return 1; 2960*fcebe456SJosef Bacik 2961*fcebe456SJosef Bacik btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 2962*fcebe456SJosef Bacik ret = btrfs_find_all_roots(trans, root->fs_info, disko, 2963*fcebe456SJosef Bacik tree_mod_seq_elem.seq, &roots); 2964*fcebe456SJosef Bacik if (ret < 0) 2965*fcebe456SJosef Bacik goto out; 2966*fcebe456SJosef Bacik ret = 0; 2967*fcebe456SJosef Bacik ULIST_ITER_INIT(&uiter); 2968*fcebe456SJosef Bacik while ((root_node = ulist_next(roots, &uiter))) { 2969*fcebe456SJosef Bacik if (root_node->val == root->objectid) { 2970*fcebe456SJosef Bacik ret = 1; 2971*fcebe456SJosef Bacik break; 2972*fcebe456SJosef Bacik } 2973*fcebe456SJosef Bacik } 2974*fcebe456SJosef Bacik ulist_free(roots); 2975*fcebe456SJosef Bacik out: 2976*fcebe456SJosef Bacik btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 2977*fcebe456SJosef Bacik return ret; 2978*fcebe456SJosef Bacik } 2979*fcebe456SJosef Bacik 298032b7c687SMark Fasheh /** 298132b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 298232b7c687SMark Fasheh * 298332b7c687SMark Fasheh * @src: Inode to clone from 298432b7c687SMark Fasheh * @inode: Inode to clone to 298532b7c687SMark Fasheh * @off: Offset within source to start clone from 298632b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 298732b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 298832b7c687SMark Fasheh * identical values here 298932b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 299032b7c687SMark Fasheh */ 299132b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 299232b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2993f46b5a66SChristoph Hellwig { 2994f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 299532b7c687SMark Fasheh struct btrfs_path *path = NULL; 2996f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 299732b7c687SMark Fasheh struct btrfs_trans_handle *trans; 299832b7c687SMark Fasheh char *buf = NULL; 2999ae01a0abSYan Zheng struct btrfs_key key; 3000f46b5a66SChristoph Hellwig u32 nritems; 3001f46b5a66SChristoph Hellwig int slot; 3002ae01a0abSYan Zheng int ret; 3003*fcebe456SJosef Bacik int no_quota; 300432b7c687SMark Fasheh u64 len = olen_aligned; 3005*fcebe456SJosef Bacik u64 last_disko = 0; 3006ae01a0abSYan Zheng 3007ae01a0abSYan Zheng ret = -ENOMEM; 3008ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 3009ae01a0abSYan Zheng if (!buf) 301032b7c687SMark Fasheh return ret; 3011ae01a0abSYan Zheng 3012ae01a0abSYan Zheng path = btrfs_alloc_path(); 3013ae01a0abSYan Zheng if (!path) { 3014ae01a0abSYan Zheng vfree(buf); 301532b7c687SMark Fasheh return ret; 3016ae01a0abSYan Zheng } 301732b7c687SMark Fasheh 3018ae01a0abSYan Zheng path->reada = 2; 3019c5c9cd4dSSage Weil /* clone data */ 302033345d01SLi Zefan key.objectid = btrfs_ino(src); 3021ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 3022ae01a0abSYan Zheng key.offset = 0; 3023f46b5a66SChristoph Hellwig 3024f46b5a66SChristoph Hellwig while (1) { 3025f46b5a66SChristoph Hellwig /* 3026f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3027f46b5a66SChristoph Hellwig * tree. 3028f46b5a66SChristoph Hellwig */ 3029e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3030362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3031362a20c5SDavid Sterba 0, 0); 3032f46b5a66SChristoph Hellwig if (ret < 0) 3033f46b5a66SChristoph Hellwig goto out; 3034f46b5a66SChristoph Hellwig 3035ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3036e4355f34SFilipe David Borba Manana process_slot: 3037*fcebe456SJosef Bacik no_quota = 1; 3038ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3039362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3040f46b5a66SChristoph Hellwig if (ret < 0) 3041f46b5a66SChristoph Hellwig goto out; 3042f46b5a66SChristoph Hellwig if (ret > 0) 3043f46b5a66SChristoph Hellwig break; 3044ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3045f46b5a66SChristoph Hellwig } 3046f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3047f46b5a66SChristoph Hellwig slot = path->slots[0]; 3048f46b5a66SChristoph Hellwig 3049ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3050d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 305133345d01SLi Zefan key.objectid != btrfs_ino(src)) 3052f46b5a66SChristoph Hellwig break; 3053f46b5a66SChristoph Hellwig 3054c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 3055c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3056c5c9cd4dSSage Weil int type; 305731840ae1SZheng Yan u32 size; 305831840ae1SZheng Yan struct btrfs_key new_key; 3059c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3060c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3061c5c9cd4dSSage Weil u8 comp; 3062b5384d48SSage Weil u64 endoff; 306331840ae1SZheng Yan 3064c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3065c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3066c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3067c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3068c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3069c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3070d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3071d397712bSChris Mason extent); 3072d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3073d397712bSChris Mason extent); 3074c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3075d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3076d397712bSChris Mason extent); 3077c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3078c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3079c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3080c5c9cd4dSSage Weil extent); 3081c5c9cd4dSSage Weil } 308231840ae1SZheng Yan 3083050006a7SSage Weil if (key.offset + datal <= off || 3084e4355f34SFilipe David Borba Manana key.offset >= off + len - 1) { 3085e4355f34SFilipe David Borba Manana path->slots[0]++; 3086e4355f34SFilipe David Borba Manana goto process_slot; 3087e4355f34SFilipe David Borba Manana } 3088e4355f34SFilipe David Borba Manana 3089e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3090e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3091e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3092e4355f34SFilipe David Borba Manana size); 3093e4355f34SFilipe David Borba Manana 3094e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3095e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3096c5c9cd4dSSage Weil 309731840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 309833345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 30994d728ec7SLi Zefan if (off <= key.offset) 3100c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 31014d728ec7SLi Zefan else 31024d728ec7SLi Zefan new_key.offset = destoff; 3103c5c9cd4dSSage Weil 3104b6f3409bSSage Weil /* 3105b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3106b6f3409bSSage Weil * 1 - add new extent 3107b6f3409bSSage Weil * 1 - inode update 3108b6f3409bSSage Weil */ 3109b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3110a22285a6SYan, Zheng if (IS_ERR(trans)) { 3111a22285a6SYan, Zheng ret = PTR_ERR(trans); 3112a22285a6SYan, Zheng goto out; 3113a22285a6SYan, Zheng } 3114a22285a6SYan, Zheng 3115c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3116c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3117d72c0842SLi Zefan /* 3118d72c0842SLi Zefan * a | --- range to clone ---| b 3119d72c0842SLi Zefan * | ------------- extent ------------- | 3120d72c0842SLi Zefan */ 3121d72c0842SLi Zefan 3122d72c0842SLi Zefan /* substract range b */ 3123d72c0842SLi Zefan if (key.offset + datal > off + len) 3124d72c0842SLi Zefan datal = off + len - key.offset; 3125d72c0842SLi Zefan 3126d72c0842SLi Zefan /* substract range a */ 3127a22285a6SYan, Zheng if (off > key.offset) { 3128a22285a6SYan, Zheng datao += off - key.offset; 3129a22285a6SYan, Zheng datal -= off - key.offset; 3130a22285a6SYan, Zheng } 3131a22285a6SYan, Zheng 31325dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3133a22285a6SYan, Zheng new_key.offset, 3134a22285a6SYan, Zheng new_key.offset + datal, 31352671485dSJosef Bacik 1); 313679787eaaSJeff Mahoney if (ret) { 31373f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 313800fdf13aSLiu Bo btrfs_abort_transaction(trans, 313900fdf13aSLiu Bo root, ret); 314079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 314179787eaaSJeff Mahoney goto out; 314279787eaaSJeff Mahoney } 3143a22285a6SYan, Zheng 314431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 314531840ae1SZheng Yan &new_key, size); 314679787eaaSJeff Mahoney if (ret) { 314779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 314879787eaaSJeff Mahoney ret); 314979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 315079787eaaSJeff Mahoney goto out; 315179787eaaSJeff Mahoney } 315231840ae1SZheng Yan 315331840ae1SZheng Yan leaf = path->nodes[0]; 315431840ae1SZheng Yan slot = path->slots[0]; 315531840ae1SZheng Yan write_extent_buffer(leaf, buf, 315631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 315731840ae1SZheng Yan size); 3158ae01a0abSYan Zheng 3159f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3160f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3161c5c9cd4dSSage Weil 3162c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3163c5c9cd4dSSage Weil if (!disko) 3164c5c9cd4dSSage Weil datao = 0; 3165c5c9cd4dSSage Weil 3166c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3167c5c9cd4dSSage Weil datao); 3168c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3169c5c9cd4dSSage Weil datal); 3170*fcebe456SJosef Bacik 3171*fcebe456SJosef Bacik /* 3172*fcebe456SJosef Bacik * We need to look up the roots that point at 3173*fcebe456SJosef Bacik * this bytenr and see if the new root does. If 3174*fcebe456SJosef Bacik * it does not we need to make sure we update 3175*fcebe456SJosef Bacik * quotas appropriately. 3176*fcebe456SJosef Bacik */ 3177*fcebe456SJosef Bacik if (disko && root != BTRFS_I(src)->root && 3178*fcebe456SJosef Bacik disko != last_disko) { 3179*fcebe456SJosef Bacik no_quota = check_ref(trans, root, 3180*fcebe456SJosef Bacik disko); 3181*fcebe456SJosef Bacik if (no_quota < 0) { 3182*fcebe456SJosef Bacik btrfs_abort_transaction(trans, 3183*fcebe456SJosef Bacik root, 3184*fcebe456SJosef Bacik ret); 3185*fcebe456SJosef Bacik btrfs_end_transaction(trans, 3186*fcebe456SJosef Bacik root); 3187*fcebe456SJosef Bacik ret = no_quota; 3188*fcebe456SJosef Bacik goto out; 3189*fcebe456SJosef Bacik } 3190*fcebe456SJosef Bacik } 3191*fcebe456SJosef Bacik 3192c5c9cd4dSSage Weil if (disko) { 3193c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3194ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 31955d4f98a2SYan Zheng disko, diskl, 0, 3196f46b5a66SChristoph Hellwig root->root_key.objectid, 319733345d01SLi Zefan btrfs_ino(inode), 319866d7e7f0SArne Jansen new_key.offset - datao, 3199*fcebe456SJosef Bacik no_quota); 320079787eaaSJeff Mahoney if (ret) { 320179787eaaSJeff Mahoney btrfs_abort_transaction(trans, 320279787eaaSJeff Mahoney root, 320379787eaaSJeff Mahoney ret); 320479787eaaSJeff Mahoney btrfs_end_transaction(trans, 320579787eaaSJeff Mahoney root); 320679787eaaSJeff Mahoney goto out; 320779787eaaSJeff Mahoney 320879787eaaSJeff Mahoney } 3209f46b5a66SChristoph Hellwig } 3210c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3211c5c9cd4dSSage Weil u64 skip = 0; 3212c5c9cd4dSSage Weil u64 trim = 0; 3213d3ecfcdfSLiu Bo u64 aligned_end = 0; 3214d3ecfcdfSLiu Bo 3215c5c9cd4dSSage Weil if (off > key.offset) { 3216c5c9cd4dSSage Weil skip = off - key.offset; 3217c5c9cd4dSSage Weil new_key.offset += skip; 321831840ae1SZheng Yan } 3219d397712bSChris Mason 3220c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3221c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3222d397712bSChris Mason 3223c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3224c5c9cd4dSSage Weil ret = -EINVAL; 3225a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3226c5c9cd4dSSage Weil goto out; 322731840ae1SZheng Yan } 3228c5c9cd4dSSage Weil size -= skip + trim; 3229c5c9cd4dSSage Weil datal -= skip + trim; 3230a22285a6SYan, Zheng 3231d3ecfcdfSLiu Bo aligned_end = ALIGN(new_key.offset + datal, 3232d3ecfcdfSLiu Bo root->sectorsize); 32335dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3234a22285a6SYan, Zheng new_key.offset, 3235d3ecfcdfSLiu Bo aligned_end, 32362671485dSJosef Bacik 1); 323779787eaaSJeff Mahoney if (ret) { 32383f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 32393a29bc09SChris Mason btrfs_abort_transaction(trans, 32403a29bc09SChris Mason root, ret); 324179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 324279787eaaSJeff Mahoney goto out; 324379787eaaSJeff Mahoney } 3244a22285a6SYan, Zheng 3245c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3246c5c9cd4dSSage Weil &new_key, size); 324779787eaaSJeff Mahoney if (ret) { 324879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 324979787eaaSJeff Mahoney ret); 325079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 325179787eaaSJeff Mahoney goto out; 325279787eaaSJeff Mahoney } 3253c5c9cd4dSSage Weil 3254c5c9cd4dSSage Weil if (skip) { 3255d397712bSChris Mason u32 start = 3256d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3257c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3258c5c9cd4dSSage Weil datal); 3259c5c9cd4dSSage Weil } 3260c5c9cd4dSSage Weil 3261c5c9cd4dSSage Weil leaf = path->nodes[0]; 3262c5c9cd4dSSage Weil slot = path->slots[0]; 3263c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3264c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3265c5c9cd4dSSage Weil size); 3266c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3267c5c9cd4dSSage Weil } 3268c5c9cd4dSSage Weil 3269c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3270b3b4aa74SDavid Sterba btrfs_release_path(path); 3271c5c9cd4dSSage Weil 32720c4d2d95SJosef Bacik inode_inc_iversion(inode); 3273a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3274b5384d48SSage Weil 3275b5384d48SSage Weil /* 3276b5384d48SSage Weil * we round up to the block size at eof when 3277b5384d48SSage Weil * determining which extents to clone above, 3278b5384d48SSage Weil * but shouldn't round up the file size 3279b5384d48SSage Weil */ 3280b5384d48SSage Weil endoff = new_key.offset + datal; 32815f3888ffSLi Zefan if (endoff > destoff+olen) 32825f3888ffSLi Zefan endoff = destoff+olen; 3283b5384d48SSage Weil if (endoff > inode->i_size) 3284b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3285b5384d48SSage Weil 3286a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 328779787eaaSJeff Mahoney if (ret) { 328879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3289a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 329079787eaaSJeff Mahoney goto out; 329179787eaaSJeff Mahoney } 329279787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3293a22285a6SYan, Zheng } 3294b3b4aa74SDavid Sterba btrfs_release_path(path); 3295ae01a0abSYan Zheng key.offset++; 3296ae01a0abSYan Zheng } 3297f46b5a66SChristoph Hellwig ret = 0; 329832b7c687SMark Fasheh 3299f46b5a66SChristoph Hellwig out: 3300b3b4aa74SDavid Sterba btrfs_release_path(path); 330132b7c687SMark Fasheh btrfs_free_path(path); 330232b7c687SMark Fasheh vfree(buf); 330332b7c687SMark Fasheh return ret; 330432b7c687SMark Fasheh } 330532b7c687SMark Fasheh 330632b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 330732b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 330832b7c687SMark Fasheh { 330954563d41SAl Viro struct inode *inode = file_inode(file); 331032b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 331132b7c687SMark Fasheh struct fd src_file; 331232b7c687SMark Fasheh struct inode *src; 331332b7c687SMark Fasheh int ret; 331432b7c687SMark Fasheh u64 len = olen; 331532b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 331632b7c687SMark Fasheh int same_inode = 0; 331732b7c687SMark Fasheh 331832b7c687SMark Fasheh /* 331932b7c687SMark Fasheh * TODO: 332032b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 332132b7c687SMark Fasheh * decompress into destination's address_space (the file offset 332232b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 332332b7c687SMark Fasheh * otherwise reinsert) a subrange. 332400fdf13aSLiu Bo * 332500fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 332600fdf13aSLiu Bo * be either compressed or non-compressed. 332732b7c687SMark Fasheh */ 332832b7c687SMark Fasheh 332932b7c687SMark Fasheh /* the destination must be opened for writing */ 333032b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 333132b7c687SMark Fasheh return -EINVAL; 333232b7c687SMark Fasheh 333332b7c687SMark Fasheh if (btrfs_root_readonly(root)) 333432b7c687SMark Fasheh return -EROFS; 333532b7c687SMark Fasheh 333632b7c687SMark Fasheh ret = mnt_want_write_file(file); 333732b7c687SMark Fasheh if (ret) 333832b7c687SMark Fasheh return ret; 333932b7c687SMark Fasheh 334032b7c687SMark Fasheh src_file = fdget(srcfd); 334132b7c687SMark Fasheh if (!src_file.file) { 334232b7c687SMark Fasheh ret = -EBADF; 334332b7c687SMark Fasheh goto out_drop_write; 334432b7c687SMark Fasheh } 334532b7c687SMark Fasheh 334632b7c687SMark Fasheh ret = -EXDEV; 334732b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 334832b7c687SMark Fasheh goto out_fput; 334932b7c687SMark Fasheh 335032b7c687SMark Fasheh src = file_inode(src_file.file); 335132b7c687SMark Fasheh 335232b7c687SMark Fasheh ret = -EINVAL; 335332b7c687SMark Fasheh if (src == inode) 335432b7c687SMark Fasheh same_inode = 1; 335532b7c687SMark Fasheh 335632b7c687SMark Fasheh /* the src must be open for reading */ 335732b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 335832b7c687SMark Fasheh goto out_fput; 335932b7c687SMark Fasheh 336032b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 336132b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 336232b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 336332b7c687SMark Fasheh goto out_fput; 336432b7c687SMark Fasheh 336532b7c687SMark Fasheh ret = -EISDIR; 336632b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 336732b7c687SMark Fasheh goto out_fput; 336832b7c687SMark Fasheh 336932b7c687SMark Fasheh ret = -EXDEV; 337032b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 337132b7c687SMark Fasheh goto out_fput; 337232b7c687SMark Fasheh 337332b7c687SMark Fasheh if (!same_inode) { 337432b7c687SMark Fasheh if (inode < src) { 337532b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 337632b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 337732b7c687SMark Fasheh } else { 337832b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 337932b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 338032b7c687SMark Fasheh } 338132b7c687SMark Fasheh } else { 338232b7c687SMark Fasheh mutex_lock(&src->i_mutex); 338332b7c687SMark Fasheh } 338432b7c687SMark Fasheh 338532b7c687SMark Fasheh /* determine range to clone */ 338632b7c687SMark Fasheh ret = -EINVAL; 338732b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 338832b7c687SMark Fasheh goto out_unlock; 338932b7c687SMark Fasheh if (len == 0) 339032b7c687SMark Fasheh olen = len = src->i_size - off; 339132b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 339232b7c687SMark Fasheh if (off + len == src->i_size) 339332b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 339432b7c687SMark Fasheh 339532b7c687SMark Fasheh /* verify the end result is block aligned */ 339632b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 339732b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 339832b7c687SMark Fasheh goto out_unlock; 339932b7c687SMark Fasheh 340032b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 340132b7c687SMark Fasheh if (same_inode) { 340232b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 340332b7c687SMark Fasheh goto out_unlock; 340432b7c687SMark Fasheh } 340532b7c687SMark Fasheh 340632b7c687SMark Fasheh if (destoff > inode->i_size) { 340732b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 340832b7c687SMark Fasheh if (ret) 340932b7c687SMark Fasheh goto out_unlock; 341032b7c687SMark Fasheh } 341132b7c687SMark Fasheh 341232b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 341332b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 341432b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 341532b7c687SMark Fasheh 341632b7c687SMark Fasheh lock_extent_range(src, off, len); 341732b7c687SMark Fasheh 341832b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 341932b7c687SMark Fasheh 3420aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3421f46b5a66SChristoph Hellwig out_unlock: 3422c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3423c57c2b3eSFilipe David Borba Manana if (inode < src) { 3424f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3425f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3426c57c2b3eSFilipe David Borba Manana } else { 3427c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3428c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3429c57c2b3eSFilipe David Borba Manana } 3430c57c2b3eSFilipe David Borba Manana } else { 3431c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3432c57c2b3eSFilipe David Borba Manana } 3433f46b5a66SChristoph Hellwig out_fput: 34342903ff01SAl Viro fdput(src_file); 3435ab67b7c1SYan Zheng out_drop_write: 34362a79f17eSAl Viro mnt_drop_write_file(file); 3437f46b5a66SChristoph Hellwig return ret; 3438f46b5a66SChristoph Hellwig } 3439f46b5a66SChristoph Hellwig 34407a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3441c5c9cd4dSSage Weil { 3442c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3443c5c9cd4dSSage Weil 34447a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3445c5c9cd4dSSage Weil return -EFAULT; 3446c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3447c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3448c5c9cd4dSSage Weil } 3449c5c9cd4dSSage Weil 3450f46b5a66SChristoph Hellwig /* 3451f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3452f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3453f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3454f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3455f46b5a66SChristoph Hellwig */ 3456b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3457f46b5a66SChristoph Hellwig { 3458496ad9aaSAl Viro struct inode *inode = file_inode(file); 3459f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3460f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 34611ab86aedSSage Weil int ret; 3462f46b5a66SChristoph Hellwig 34631ab86aedSSage Weil ret = -EPERM; 3464df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3465f46b5a66SChristoph Hellwig goto out; 34661ab86aedSSage Weil 34671ab86aedSSage Weil ret = -EINPROGRESS; 34681ab86aedSSage Weil if (file->private_data) 34691ab86aedSSage Weil goto out; 34709ca9ee09SSage Weil 3471b83cc969SLi Zefan ret = -EROFS; 3472b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3473b83cc969SLi Zefan goto out; 3474b83cc969SLi Zefan 3475a561be71SAl Viro ret = mnt_want_write_file(file); 3476c146afadSYan Zheng if (ret) 3477c146afadSYan Zheng goto out; 3478c146afadSYan Zheng 3479a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 34809ca9ee09SSage Weil 3481f46b5a66SChristoph Hellwig ret = -ENOMEM; 34827a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3483abd30bb0STsutomu Itoh if (IS_ERR(trans)) 34841ab86aedSSage Weil goto out_drop; 34851ab86aedSSage Weil 34861ab86aedSSage Weil file->private_data = trans; 34871ab86aedSSage Weil return 0; 34881ab86aedSSage Weil 34891ab86aedSSage Weil out_drop: 3490a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 34912a79f17eSAl Viro mnt_drop_write_file(file); 3492f46b5a66SChristoph Hellwig out: 3493f46b5a66SChristoph Hellwig return ret; 3494f46b5a66SChristoph Hellwig } 3495f46b5a66SChristoph Hellwig 34966ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34976ef5ed0dSJosef Bacik { 3498496ad9aaSAl Viro struct inode *inode = file_inode(file); 34996ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 35006ef5ed0dSJosef Bacik struct btrfs_root *new_root; 35016ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 35026ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 35036ef5ed0dSJosef Bacik struct btrfs_path *path; 35046ef5ed0dSJosef Bacik struct btrfs_key location; 35056ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 35066ef5ed0dSJosef Bacik u64 objectid = 0; 35076ef5ed0dSJosef Bacik u64 dir_id; 35083c04ce01SMiao Xie int ret; 35096ef5ed0dSJosef Bacik 35106ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 35116ef5ed0dSJosef Bacik return -EPERM; 35126ef5ed0dSJosef Bacik 35133c04ce01SMiao Xie ret = mnt_want_write_file(file); 35143c04ce01SMiao Xie if (ret) 35153c04ce01SMiao Xie return ret; 35163c04ce01SMiao Xie 35173c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 35183c04ce01SMiao Xie ret = -EFAULT; 35193c04ce01SMiao Xie goto out; 35203c04ce01SMiao Xie } 35216ef5ed0dSJosef Bacik 35226ef5ed0dSJosef Bacik if (!objectid) 35231cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 35246ef5ed0dSJosef Bacik 35256ef5ed0dSJosef Bacik location.objectid = objectid; 35266ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 35276ef5ed0dSJosef Bacik location.offset = (u64)-1; 35286ef5ed0dSJosef Bacik 35296ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 35303c04ce01SMiao Xie if (IS_ERR(new_root)) { 35313c04ce01SMiao Xie ret = PTR_ERR(new_root); 35323c04ce01SMiao Xie goto out; 35333c04ce01SMiao Xie } 35346ef5ed0dSJosef Bacik 35356ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 35363c04ce01SMiao Xie if (!path) { 35373c04ce01SMiao Xie ret = -ENOMEM; 35383c04ce01SMiao Xie goto out; 35393c04ce01SMiao Xie } 35406ef5ed0dSJosef Bacik path->leave_spinning = 1; 35416ef5ed0dSJosef Bacik 35426ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 354398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 35446ef5ed0dSJosef Bacik btrfs_free_path(path); 35453c04ce01SMiao Xie ret = PTR_ERR(trans); 35463c04ce01SMiao Xie goto out; 35476ef5ed0dSJosef Bacik } 35486ef5ed0dSJosef Bacik 35496c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 35506ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 35516ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3552cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 35536ef5ed0dSJosef Bacik btrfs_free_path(path); 35546ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3555efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3556efe120a0SFrank Holton "item, this isn't going to work"); 35573c04ce01SMiao Xie ret = -ENOENT; 35583c04ce01SMiao Xie goto out; 35596ef5ed0dSJosef Bacik } 35606ef5ed0dSJosef Bacik 35616ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 35626ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 35636ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 35646ef5ed0dSJosef Bacik btrfs_free_path(path); 35656ef5ed0dSJosef Bacik 35662b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 35676ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 35683c04ce01SMiao Xie out: 35693c04ce01SMiao Xie mnt_drop_write_file(file); 35703c04ce01SMiao Xie return ret; 35716ef5ed0dSJosef Bacik } 35726ef5ed0dSJosef Bacik 35735af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3574bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3575bf5fc093SJosef Bacik { 3576bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3577bf5fc093SJosef Bacik 3578bf5fc093SJosef Bacik space->total_bytes = 0; 3579bf5fc093SJosef Bacik space->used_bytes = 0; 3580bf5fc093SJosef Bacik space->flags = 0; 3581bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3582bf5fc093SJosef Bacik space->flags = block_group->flags; 3583bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3584bf5fc093SJosef Bacik space->used_bytes += 3585bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3586bf5fc093SJosef Bacik } 3587bf5fc093SJosef Bacik } 3588bf5fc093SJosef Bacik 358948a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 35901406e432SJosef Bacik { 35911406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35921406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35931406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35947fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 359513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35961406e432SJosef Bacik struct btrfs_space_info *info; 3597bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3598bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3599bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3600bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3601bf5fc093SJosef Bacik int num_types = 4; 36027fde62bfSChris Mason int alloc_size; 36031406e432SJosef Bacik int ret = 0; 360451788b1bSDan Rosenberg u64 slot_count = 0; 3605bf5fc093SJosef Bacik int i, c; 36061406e432SJosef Bacik 36071406e432SJosef Bacik if (copy_from_user(&space_args, 36081406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 36091406e432SJosef Bacik sizeof(space_args))) 36101406e432SJosef Bacik return -EFAULT; 36111406e432SJosef Bacik 3612bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3613bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3614bf5fc093SJosef Bacik 3615bf5fc093SJosef Bacik info = NULL; 36167fde62bfSChris Mason rcu_read_lock(); 3617bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3618bf5fc093SJosef Bacik list) { 3619bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3620bf5fc093SJosef Bacik info = tmp; 3621bf5fc093SJosef Bacik break; 3622bf5fc093SJosef Bacik } 3623bf5fc093SJosef Bacik } 36247fde62bfSChris Mason rcu_read_unlock(); 36251406e432SJosef Bacik 3626bf5fc093SJosef Bacik if (!info) 3627bf5fc093SJosef Bacik continue; 3628bf5fc093SJosef Bacik 3629bf5fc093SJosef Bacik down_read(&info->groups_sem); 3630bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3631bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3632bf5fc093SJosef Bacik slot_count++; 3633bf5fc093SJosef Bacik } 3634bf5fc093SJosef Bacik up_read(&info->groups_sem); 3635bf5fc093SJosef Bacik } 3636bf5fc093SJosef Bacik 363736523e95SDavid Sterba /* 363836523e95SDavid Sterba * Global block reserve, exported as a space_info 363936523e95SDavid Sterba */ 364036523e95SDavid Sterba slot_count++; 364136523e95SDavid Sterba 36427fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 36437fde62bfSChris Mason if (space_args.space_slots == 0) { 36447fde62bfSChris Mason space_args.total_spaces = slot_count; 36457fde62bfSChris Mason goto out; 36467fde62bfSChris Mason } 3647bf5fc093SJosef Bacik 364851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3649bf5fc093SJosef Bacik 36507fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3651bf5fc093SJosef Bacik 36527fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 36537fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 36547fde62bfSChris Mason */ 36557fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 36567fde62bfSChris Mason return -ENOMEM; 36577fde62bfSChris Mason 36587fde62bfSChris Mason space_args.total_spaces = 0; 36597fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 36607fde62bfSChris Mason if (!dest) 36617fde62bfSChris Mason return -ENOMEM; 36627fde62bfSChris Mason dest_orig = dest; 36637fde62bfSChris Mason 36647fde62bfSChris Mason /* now we have a buffer to copy into */ 3665bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3666bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3667bf5fc093SJosef Bacik 366851788b1bSDan Rosenberg if (!slot_count) 366951788b1bSDan Rosenberg break; 367051788b1bSDan Rosenberg 3671bf5fc093SJosef Bacik info = NULL; 36721406e432SJosef Bacik rcu_read_lock(); 3673bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3674bf5fc093SJosef Bacik list) { 3675bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3676bf5fc093SJosef Bacik info = tmp; 36777fde62bfSChris Mason break; 3678bf5fc093SJosef Bacik } 3679bf5fc093SJosef Bacik } 3680bf5fc093SJosef Bacik rcu_read_unlock(); 36817fde62bfSChris Mason 3682bf5fc093SJosef Bacik if (!info) 3683bf5fc093SJosef Bacik continue; 3684bf5fc093SJosef Bacik down_read(&info->groups_sem); 3685bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3686bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 36875af3e8ccSStefan Behrens btrfs_get_block_group_info( 36885af3e8ccSStefan Behrens &info->block_groups[c], &space); 36897fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36901406e432SJosef Bacik dest++; 36911406e432SJosef Bacik space_args.total_spaces++; 369251788b1bSDan Rosenberg slot_count--; 36931406e432SJosef Bacik } 369451788b1bSDan Rosenberg if (!slot_count) 369551788b1bSDan Rosenberg break; 3696bf5fc093SJosef Bacik } 3697bf5fc093SJosef Bacik up_read(&info->groups_sem); 3698bf5fc093SJosef Bacik } 36991406e432SJosef Bacik 370036523e95SDavid Sterba /* 370136523e95SDavid Sterba * Add global block reserve 370236523e95SDavid Sterba */ 370336523e95SDavid Sterba if (slot_count) { 370436523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 370536523e95SDavid Sterba 370636523e95SDavid Sterba spin_lock(&block_rsv->lock); 370736523e95SDavid Sterba space.total_bytes = block_rsv->size; 370836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 370936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 371036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 371136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 371236523e95SDavid Sterba space_args.total_spaces++; 371336523e95SDavid Sterba } 371436523e95SDavid Sterba 37152eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 37167fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 37177fde62bfSChris Mason 37187fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 37197fde62bfSChris Mason ret = -EFAULT; 37207fde62bfSChris Mason 37217fde62bfSChris Mason kfree(dest_orig); 37227fde62bfSChris Mason out: 37237fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 37241406e432SJosef Bacik ret = -EFAULT; 37251406e432SJosef Bacik 37261406e432SJosef Bacik return ret; 37271406e432SJosef Bacik } 37281406e432SJosef Bacik 3729f46b5a66SChristoph Hellwig /* 3730f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3731f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3732f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3733f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3734f46b5a66SChristoph Hellwig */ 3735f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3736f46b5a66SChristoph Hellwig { 3737496ad9aaSAl Viro struct inode *inode = file_inode(file); 3738f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3739f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3740f46b5a66SChristoph Hellwig 3741f46b5a66SChristoph Hellwig trans = file->private_data; 37421ab86aedSSage Weil if (!trans) 37431ab86aedSSage Weil return -EINVAL; 3744b214107eSChristoph Hellwig file->private_data = NULL; 37459ca9ee09SSage Weil 37461ab86aedSSage Weil btrfs_end_transaction(trans, root); 37471ab86aedSSage Weil 3748a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 37499ca9ee09SSage Weil 37502a79f17eSAl Viro mnt_drop_write_file(file); 37511ab86aedSSage Weil return 0; 3752f46b5a66SChristoph Hellwig } 3753f46b5a66SChristoph Hellwig 37549a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 37559a8c28beSMiao Xie void __user *argp) 375646204592SSage Weil { 375746204592SSage Weil struct btrfs_trans_handle *trans; 375846204592SSage Weil u64 transid; 3759db5b493aSTsutomu Itoh int ret; 376046204592SSage Weil 3761d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3762ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3763ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 376498d5dc13STsutomu Itoh return PTR_ERR(trans); 3765ff7c1d33SMiao Xie 3766ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3767ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3768ff7c1d33SMiao Xie goto out; 3769ff7c1d33SMiao Xie } 377046204592SSage Weil transid = trans->transid; 3771db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 37728b2b2d3cSTsutomu Itoh if (ret) { 37738b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3774db5b493aSTsutomu Itoh return ret; 37758b2b2d3cSTsutomu Itoh } 3776ff7c1d33SMiao Xie out: 377746204592SSage Weil if (argp) 377846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 377946204592SSage Weil return -EFAULT; 378046204592SSage Weil return 0; 378146204592SSage Weil } 378246204592SSage Weil 37839a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 37849a8c28beSMiao Xie void __user *argp) 378546204592SSage Weil { 378646204592SSage Weil u64 transid; 378746204592SSage Weil 378846204592SSage Weil if (argp) { 378946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 379046204592SSage Weil return -EFAULT; 379146204592SSage Weil } else { 379246204592SSage Weil transid = 0; /* current trans */ 379346204592SSage Weil } 379446204592SSage Weil return btrfs_wait_for_commit(root, transid); 379546204592SSage Weil } 379646204592SSage Weil 3797b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3798475f6387SJan Schmidt { 3799496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3800475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3801b8e95489SMiao Xie int ret; 3802475f6387SJan Schmidt 3803475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3804475f6387SJan Schmidt return -EPERM; 3805475f6387SJan Schmidt 3806475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3807475f6387SJan Schmidt if (IS_ERR(sa)) 3808475f6387SJan Schmidt return PTR_ERR(sa); 3809475f6387SJan Schmidt 3810b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3811b8e95489SMiao Xie ret = mnt_want_write_file(file); 3812b8e95489SMiao Xie if (ret) 3813b8e95489SMiao Xie goto out; 3814b8e95489SMiao Xie } 3815b8e95489SMiao Xie 3816aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 381763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 381863a212abSStefan Behrens 0); 3819475f6387SJan Schmidt 3820475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3821475f6387SJan Schmidt ret = -EFAULT; 3822475f6387SJan Schmidt 3823b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3824b8e95489SMiao Xie mnt_drop_write_file(file); 3825b8e95489SMiao Xie out: 3826475f6387SJan Schmidt kfree(sa); 3827475f6387SJan Schmidt return ret; 3828475f6387SJan Schmidt } 3829475f6387SJan Schmidt 3830475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3831475f6387SJan Schmidt { 3832475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3833475f6387SJan Schmidt return -EPERM; 3834475f6387SJan Schmidt 3835aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3836475f6387SJan Schmidt } 3837475f6387SJan Schmidt 3838475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3839475f6387SJan Schmidt void __user *arg) 3840475f6387SJan Schmidt { 3841475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3842475f6387SJan Schmidt int ret; 3843475f6387SJan Schmidt 3844475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3845475f6387SJan Schmidt return -EPERM; 3846475f6387SJan Schmidt 3847475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3848475f6387SJan Schmidt if (IS_ERR(sa)) 3849475f6387SJan Schmidt return PTR_ERR(sa); 3850475f6387SJan Schmidt 3851475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3852475f6387SJan Schmidt 3853475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3854475f6387SJan Schmidt ret = -EFAULT; 3855475f6387SJan Schmidt 3856475f6387SJan Schmidt kfree(sa); 3857475f6387SJan Schmidt return ret; 3858475f6387SJan Schmidt } 3859475f6387SJan Schmidt 3860c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3861b27f7c0cSDavid Sterba void __user *arg) 3862c11d2c23SStefan Behrens { 3863c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3864c11d2c23SStefan Behrens int ret; 3865c11d2c23SStefan Behrens 3866c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3867c11d2c23SStefan Behrens if (IS_ERR(sa)) 3868c11d2c23SStefan Behrens return PTR_ERR(sa); 3869c11d2c23SStefan Behrens 3870b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3871b27f7c0cSDavid Sterba kfree(sa); 3872b27f7c0cSDavid Sterba return -EPERM; 3873b27f7c0cSDavid Sterba } 3874b27f7c0cSDavid Sterba 3875b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3876c11d2c23SStefan Behrens 3877c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3878c11d2c23SStefan Behrens ret = -EFAULT; 3879c11d2c23SStefan Behrens 3880c11d2c23SStefan Behrens kfree(sa); 3881c11d2c23SStefan Behrens return ret; 3882c11d2c23SStefan Behrens } 3883c11d2c23SStefan Behrens 38843f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 38853f6bcfbdSStefan Behrens { 38863f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 38873f6bcfbdSStefan Behrens int ret; 38883f6bcfbdSStefan Behrens 38893f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38903f6bcfbdSStefan Behrens return -EPERM; 38913f6bcfbdSStefan Behrens 38923f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38933f6bcfbdSStefan Behrens if (IS_ERR(p)) 38943f6bcfbdSStefan Behrens return PTR_ERR(p); 38953f6bcfbdSStefan Behrens 38963f6bcfbdSStefan Behrens switch (p->cmd) { 38973f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3898adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3899adfa97cbSIlya Dryomov ret = -EROFS; 3900adfa97cbSIlya Dryomov goto out; 3901adfa97cbSIlya Dryomov } 39023f6bcfbdSStefan Behrens if (atomic_xchg( 39033f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 39043f6bcfbdSStefan Behrens 1)) { 3905e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 39063f6bcfbdSStefan Behrens } else { 39073f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 39083f6bcfbdSStefan Behrens atomic_set( 39093f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 39103f6bcfbdSStefan Behrens 0); 39113f6bcfbdSStefan Behrens } 39123f6bcfbdSStefan Behrens break; 39133f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 39143f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 39153f6bcfbdSStefan Behrens ret = 0; 39163f6bcfbdSStefan Behrens break; 39173f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 39183f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 39193f6bcfbdSStefan Behrens break; 39203f6bcfbdSStefan Behrens default: 39213f6bcfbdSStefan Behrens ret = -EINVAL; 39223f6bcfbdSStefan Behrens break; 39233f6bcfbdSStefan Behrens } 39243f6bcfbdSStefan Behrens 39253f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 39263f6bcfbdSStefan Behrens ret = -EFAULT; 3927adfa97cbSIlya Dryomov out: 39283f6bcfbdSStefan Behrens kfree(p); 39293f6bcfbdSStefan Behrens return ret; 39303f6bcfbdSStefan Behrens } 39313f6bcfbdSStefan Behrens 3932d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3933d7728c96SJan Schmidt { 3934d7728c96SJan Schmidt int ret = 0; 3935d7728c96SJan Schmidt int i; 3936740c3d22SChris Mason u64 rel_ptr; 3937d7728c96SJan Schmidt int size; 3938806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3939d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3940d7728c96SJan Schmidt struct btrfs_path *path; 3941d7728c96SJan Schmidt 394282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3943d7728c96SJan Schmidt return -EPERM; 3944d7728c96SJan Schmidt 3945d7728c96SJan Schmidt path = btrfs_alloc_path(); 3946d7728c96SJan Schmidt if (!path) { 3947d7728c96SJan Schmidt ret = -ENOMEM; 3948d7728c96SJan Schmidt goto out; 3949d7728c96SJan Schmidt } 3950d7728c96SJan Schmidt 3951d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3952d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3953d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3954d7728c96SJan Schmidt ipa = NULL; 3955d7728c96SJan Schmidt goto out; 3956d7728c96SJan Schmidt } 3957d7728c96SJan Schmidt 3958d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3959d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3960d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3961d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3962d7728c96SJan Schmidt ipath = NULL; 3963d7728c96SJan Schmidt goto out; 3964d7728c96SJan Schmidt } 3965d7728c96SJan Schmidt 3966d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3967d7728c96SJan Schmidt if (ret < 0) 3968d7728c96SJan Schmidt goto out; 3969d7728c96SJan Schmidt 3970d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3971745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3972745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3973740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3974d7728c96SJan Schmidt } 3975d7728c96SJan Schmidt 3976745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3977745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3978d7728c96SJan Schmidt if (ret) { 3979d7728c96SJan Schmidt ret = -EFAULT; 3980d7728c96SJan Schmidt goto out; 3981d7728c96SJan Schmidt } 3982d7728c96SJan Schmidt 3983d7728c96SJan Schmidt out: 3984d7728c96SJan Schmidt btrfs_free_path(path); 3985d7728c96SJan Schmidt free_ipath(ipath); 3986d7728c96SJan Schmidt kfree(ipa); 3987d7728c96SJan Schmidt 3988d7728c96SJan Schmidt return ret; 3989d7728c96SJan Schmidt } 3990d7728c96SJan Schmidt 3991d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3992d7728c96SJan Schmidt { 3993d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3994d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3995d7728c96SJan Schmidt 3996d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3997d7728c96SJan Schmidt inodes->bytes_left -= c; 3998d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3999d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4000d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4001d7728c96SJan Schmidt inodes->elem_cnt += 3; 4002d7728c96SJan Schmidt } else { 4003d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4004d7728c96SJan Schmidt inodes->bytes_left = 0; 4005d7728c96SJan Schmidt inodes->elem_missed += 3; 4006d7728c96SJan Schmidt } 4007d7728c96SJan Schmidt 4008d7728c96SJan Schmidt return 0; 4009d7728c96SJan Schmidt } 4010d7728c96SJan Schmidt 4011d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4012d7728c96SJan Schmidt void __user *arg) 4013d7728c96SJan Schmidt { 4014d7728c96SJan Schmidt int ret = 0; 4015d7728c96SJan Schmidt int size; 4016d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4017d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4018d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4019d7728c96SJan Schmidt 4020d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4021d7728c96SJan Schmidt return -EPERM; 4022d7728c96SJan Schmidt 4023d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4024d7728c96SJan Schmidt if (IS_ERR(loi)) { 4025d7728c96SJan Schmidt ret = PTR_ERR(loi); 4026d7728c96SJan Schmidt loi = NULL; 4027d7728c96SJan Schmidt goto out; 4028d7728c96SJan Schmidt } 4029d7728c96SJan Schmidt 4030d7728c96SJan Schmidt path = btrfs_alloc_path(); 4031d7728c96SJan Schmidt if (!path) { 4032d7728c96SJan Schmidt ret = -ENOMEM; 4033d7728c96SJan Schmidt goto out; 4034d7728c96SJan Schmidt } 4035d7728c96SJan Schmidt 4036425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4037d7728c96SJan Schmidt inodes = init_data_container(size); 4038d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4039d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4040d7728c96SJan Schmidt inodes = NULL; 4041d7728c96SJan Schmidt goto out; 4042d7728c96SJan Schmidt } 4043d7728c96SJan Schmidt 4044df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4045df031f07SLiu Bo build_ino_list, inodes); 4046df031f07SLiu Bo if (ret == -EINVAL) 4047d7728c96SJan Schmidt ret = -ENOENT; 4048d7728c96SJan Schmidt if (ret < 0) 4049d7728c96SJan Schmidt goto out; 4050d7728c96SJan Schmidt 4051745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4052745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4053d7728c96SJan Schmidt if (ret) 4054d7728c96SJan Schmidt ret = -EFAULT; 4055d7728c96SJan Schmidt 4056d7728c96SJan Schmidt out: 4057d7728c96SJan Schmidt btrfs_free_path(path); 4058425d17a2SLiu Bo vfree(inodes); 4059d7728c96SJan Schmidt kfree(loi); 4060d7728c96SJan Schmidt 4061d7728c96SJan Schmidt return ret; 4062d7728c96SJan Schmidt } 4063d7728c96SJan Schmidt 406419a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4065c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4066c9e9f97bSIlya Dryomov { 4067c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4068c9e9f97bSIlya Dryomov 4069c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4070c9e9f97bSIlya Dryomov 4071837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4072837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4073837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4074837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4075a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4076a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4077837d5b6eSIlya Dryomov 4078c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4079c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4080c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 408119a39dceSIlya Dryomov 408219a39dceSIlya Dryomov if (lock) { 408319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 408419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 408519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 408619a39dceSIlya Dryomov } else { 408719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 408819a39dceSIlya Dryomov } 4089c9e9f97bSIlya Dryomov } 4090c9e9f97bSIlya Dryomov 40919ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4092c9e9f97bSIlya Dryomov { 4093496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4094c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4095c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4096c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4097ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4098c9e9f97bSIlya Dryomov int ret; 4099c9e9f97bSIlya Dryomov 4100c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4101c9e9f97bSIlya Dryomov return -EPERM; 4102c9e9f97bSIlya Dryomov 4103e54bfa31SLiu Bo ret = mnt_want_write_file(file); 41049ba1f6e4SLiu Bo if (ret) 41059ba1f6e4SLiu Bo return ret; 41069ba1f6e4SLiu Bo 4107ed0fb78fSIlya Dryomov again: 4108ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4109c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4110c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4111ed0fb78fSIlya Dryomov need_unlock = true; 4112ed0fb78fSIlya Dryomov goto locked; 4113ed0fb78fSIlya Dryomov } 4114ed0fb78fSIlya Dryomov 4115ed0fb78fSIlya Dryomov /* 4116ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4117ed0fb78fSIlya Dryomov * (1) some other op is running 4118ed0fb78fSIlya Dryomov * (2) balance is running 4119ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4120ed0fb78fSIlya Dryomov */ 4121ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4122ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4123ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4124ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4125ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4126ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4127ed0fb78fSIlya Dryomov goto again; 4128ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4129ed0fb78fSIlya Dryomov 4130ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4131ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4132ed0fb78fSIlya Dryomov /* this is (3) */ 4133ed0fb78fSIlya Dryomov need_unlock = false; 4134ed0fb78fSIlya Dryomov goto locked; 4135ed0fb78fSIlya Dryomov } 4136ed0fb78fSIlya Dryomov 4137ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4138ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4139ed0fb78fSIlya Dryomov goto again; 4140ed0fb78fSIlya Dryomov } else { 4141ed0fb78fSIlya Dryomov /* this is (2) */ 4142ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4143ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4144ed0fb78fSIlya Dryomov goto out; 4145ed0fb78fSIlya Dryomov } 4146ed0fb78fSIlya Dryomov } else { 4147ed0fb78fSIlya Dryomov /* this is (1) */ 4148ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4149e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4150ed0fb78fSIlya Dryomov goto out; 4151ed0fb78fSIlya Dryomov } 4152ed0fb78fSIlya Dryomov 4153ed0fb78fSIlya Dryomov locked: 4154ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4155c9e9f97bSIlya Dryomov 4156c9e9f97bSIlya Dryomov if (arg) { 4157c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4158c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4159c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4160ed0fb78fSIlya Dryomov goto out_unlock; 4161c9e9f97bSIlya Dryomov } 4162de322263SIlya Dryomov 4163de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4164de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4165de322263SIlya Dryomov ret = -ENOTCONN; 4166de322263SIlya Dryomov goto out_bargs; 4167de322263SIlya Dryomov } 4168de322263SIlya Dryomov 4169de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4170de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4171de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4172de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4173de322263SIlya Dryomov 4174de322263SIlya Dryomov goto do_balance; 4175de322263SIlya Dryomov } 4176c9e9f97bSIlya Dryomov } else { 4177c9e9f97bSIlya Dryomov bargs = NULL; 4178c9e9f97bSIlya Dryomov } 4179c9e9f97bSIlya Dryomov 4180ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4181837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4182837d5b6eSIlya Dryomov goto out_bargs; 4183837d5b6eSIlya Dryomov } 4184837d5b6eSIlya Dryomov 4185c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4186c9e9f97bSIlya Dryomov if (!bctl) { 4187c9e9f97bSIlya Dryomov ret = -ENOMEM; 4188c9e9f97bSIlya Dryomov goto out_bargs; 4189c9e9f97bSIlya Dryomov } 4190c9e9f97bSIlya Dryomov 4191c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4192c9e9f97bSIlya Dryomov if (arg) { 4193c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4194c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4195c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4196c9e9f97bSIlya Dryomov 4197c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4198f43ffb60SIlya Dryomov } else { 4199f43ffb60SIlya Dryomov /* balance everything - no filters */ 4200f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4201c9e9f97bSIlya Dryomov } 4202c9e9f97bSIlya Dryomov 4203de322263SIlya Dryomov do_balance: 4204c9e9f97bSIlya Dryomov /* 4205ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4206ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4207ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4208ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4209ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4210c9e9f97bSIlya Dryomov */ 4211ed0fb78fSIlya Dryomov need_unlock = false; 4212ed0fb78fSIlya Dryomov 4213ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4214ed0fb78fSIlya Dryomov 4215c9e9f97bSIlya Dryomov if (arg) { 4216c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4217c9e9f97bSIlya Dryomov ret = -EFAULT; 4218c9e9f97bSIlya Dryomov } 4219c9e9f97bSIlya Dryomov 4220c9e9f97bSIlya Dryomov out_bargs: 4221c9e9f97bSIlya Dryomov kfree(bargs); 4222ed0fb78fSIlya Dryomov out_unlock: 4223c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4224c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4225ed0fb78fSIlya Dryomov if (need_unlock) 4226ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4227ed0fb78fSIlya Dryomov out: 4228e54bfa31SLiu Bo mnt_drop_write_file(file); 4229c9e9f97bSIlya Dryomov return ret; 4230c9e9f97bSIlya Dryomov } 4231c9e9f97bSIlya Dryomov 4232837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4233837d5b6eSIlya Dryomov { 4234837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4235837d5b6eSIlya Dryomov return -EPERM; 4236837d5b6eSIlya Dryomov 4237837d5b6eSIlya Dryomov switch (cmd) { 4238837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4239837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4240a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4241a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4242837d5b6eSIlya Dryomov } 4243837d5b6eSIlya Dryomov 4244837d5b6eSIlya Dryomov return -EINVAL; 4245837d5b6eSIlya Dryomov } 4246837d5b6eSIlya Dryomov 424719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 424819a39dceSIlya Dryomov void __user *arg) 424919a39dceSIlya Dryomov { 425019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 425119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 425219a39dceSIlya Dryomov int ret = 0; 425319a39dceSIlya Dryomov 425419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 425519a39dceSIlya Dryomov return -EPERM; 425619a39dceSIlya Dryomov 425719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 425819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 425919a39dceSIlya Dryomov ret = -ENOTCONN; 426019a39dceSIlya Dryomov goto out; 426119a39dceSIlya Dryomov } 426219a39dceSIlya Dryomov 426319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 426419a39dceSIlya Dryomov if (!bargs) { 426519a39dceSIlya Dryomov ret = -ENOMEM; 426619a39dceSIlya Dryomov goto out; 426719a39dceSIlya Dryomov } 426819a39dceSIlya Dryomov 426919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 427019a39dceSIlya Dryomov 427119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 427219a39dceSIlya Dryomov ret = -EFAULT; 427319a39dceSIlya Dryomov 427419a39dceSIlya Dryomov kfree(bargs); 427519a39dceSIlya Dryomov out: 427619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 427719a39dceSIlya Dryomov return ret; 427819a39dceSIlya Dryomov } 427919a39dceSIlya Dryomov 4280905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42815d13a37bSArne Jansen { 4282496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42835d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42845d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 42855d13a37bSArne Jansen int ret; 42865d13a37bSArne Jansen int err; 42875d13a37bSArne Jansen 42885d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42895d13a37bSArne Jansen return -EPERM; 42905d13a37bSArne Jansen 4291905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4292905b0ddaSMiao Xie if (ret) 4293905b0ddaSMiao Xie return ret; 42945d13a37bSArne Jansen 42955d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4296905b0ddaSMiao Xie if (IS_ERR(sa)) { 4297905b0ddaSMiao Xie ret = PTR_ERR(sa); 4298905b0ddaSMiao Xie goto drop_write; 4299905b0ddaSMiao Xie } 43005d13a37bSArne Jansen 43017708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 430292f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 43035d13a37bSArne Jansen if (IS_ERR(trans)) { 43045d13a37bSArne Jansen ret = PTR_ERR(trans); 43055d13a37bSArne Jansen goto out; 43065d13a37bSArne Jansen } 43075d13a37bSArne Jansen 43085d13a37bSArne Jansen switch (sa->cmd) { 43095d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 43105d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 43115d13a37bSArne Jansen break; 43125d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 43135d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 43145d13a37bSArne Jansen break; 43155d13a37bSArne Jansen default: 43165d13a37bSArne Jansen ret = -EINVAL; 43175d13a37bSArne Jansen break; 43185d13a37bSArne Jansen } 43195d13a37bSArne Jansen 432092f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 43215d13a37bSArne Jansen if (err && !ret) 43225d13a37bSArne Jansen ret = err; 43235d13a37bSArne Jansen out: 43245d13a37bSArne Jansen kfree(sa); 43257708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4326905b0ddaSMiao Xie drop_write: 4327905b0ddaSMiao Xie mnt_drop_write_file(file); 43285d13a37bSArne Jansen return ret; 43295d13a37bSArne Jansen } 43305d13a37bSArne Jansen 4331905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 43325d13a37bSArne Jansen { 4333496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43345d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 43355d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43365d13a37bSArne Jansen int ret; 43375d13a37bSArne Jansen int err; 43385d13a37bSArne Jansen 43395d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43405d13a37bSArne Jansen return -EPERM; 43415d13a37bSArne Jansen 4342905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4343905b0ddaSMiao Xie if (ret) 4344905b0ddaSMiao Xie return ret; 43455d13a37bSArne Jansen 43465d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4347905b0ddaSMiao Xie if (IS_ERR(sa)) { 4348905b0ddaSMiao Xie ret = PTR_ERR(sa); 4349905b0ddaSMiao Xie goto drop_write; 4350905b0ddaSMiao Xie } 43515d13a37bSArne Jansen 43525d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43535d13a37bSArne Jansen if (IS_ERR(trans)) { 43545d13a37bSArne Jansen ret = PTR_ERR(trans); 43555d13a37bSArne Jansen goto out; 43565d13a37bSArne Jansen } 43575d13a37bSArne Jansen 43585d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 43595d13a37bSArne Jansen if (sa->assign) { 43605d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 43615d13a37bSArne Jansen sa->src, sa->dst); 43625d13a37bSArne Jansen } else { 43635d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 43645d13a37bSArne Jansen sa->src, sa->dst); 43655d13a37bSArne Jansen } 43665d13a37bSArne Jansen 43675d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 43685d13a37bSArne Jansen if (err && !ret) 43695d13a37bSArne Jansen ret = err; 43705d13a37bSArne Jansen 43715d13a37bSArne Jansen out: 43725d13a37bSArne Jansen kfree(sa); 4373905b0ddaSMiao Xie drop_write: 4374905b0ddaSMiao Xie mnt_drop_write_file(file); 43755d13a37bSArne Jansen return ret; 43765d13a37bSArne Jansen } 43775d13a37bSArne Jansen 4378905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 43795d13a37bSArne Jansen { 4380496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43815d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43825d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43835d13a37bSArne Jansen int ret; 43845d13a37bSArne Jansen int err; 43855d13a37bSArne Jansen 43865d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43875d13a37bSArne Jansen return -EPERM; 43885d13a37bSArne Jansen 4389905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4390905b0ddaSMiao Xie if (ret) 4391905b0ddaSMiao Xie return ret; 43925d13a37bSArne Jansen 43935d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4394905b0ddaSMiao Xie if (IS_ERR(sa)) { 4395905b0ddaSMiao Xie ret = PTR_ERR(sa); 4396905b0ddaSMiao Xie goto drop_write; 4397905b0ddaSMiao Xie } 43985d13a37bSArne Jansen 4399d86e56cfSMiao Xie if (!sa->qgroupid) { 4400d86e56cfSMiao Xie ret = -EINVAL; 4401d86e56cfSMiao Xie goto out; 4402d86e56cfSMiao Xie } 4403d86e56cfSMiao Xie 44045d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44055d13a37bSArne Jansen if (IS_ERR(trans)) { 44065d13a37bSArne Jansen ret = PTR_ERR(trans); 44075d13a37bSArne Jansen goto out; 44085d13a37bSArne Jansen } 44095d13a37bSArne Jansen 44105d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 44115d13a37bSArne Jansen if (sa->create) { 44125d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 44135d13a37bSArne Jansen NULL); 44145d13a37bSArne Jansen } else { 44155d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 44165d13a37bSArne Jansen } 44175d13a37bSArne Jansen 44185d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 44195d13a37bSArne Jansen if (err && !ret) 44205d13a37bSArne Jansen ret = err; 44215d13a37bSArne Jansen 44225d13a37bSArne Jansen out: 44235d13a37bSArne Jansen kfree(sa); 4424905b0ddaSMiao Xie drop_write: 4425905b0ddaSMiao Xie mnt_drop_write_file(file); 44265d13a37bSArne Jansen return ret; 44275d13a37bSArne Jansen } 44285d13a37bSArne Jansen 4429905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 44305d13a37bSArne Jansen { 4431496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44325d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 44335d13a37bSArne Jansen struct btrfs_trans_handle *trans; 44345d13a37bSArne Jansen int ret; 44355d13a37bSArne Jansen int err; 44365d13a37bSArne Jansen u64 qgroupid; 44375d13a37bSArne Jansen 44385d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44395d13a37bSArne Jansen return -EPERM; 44405d13a37bSArne Jansen 4441905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4442905b0ddaSMiao Xie if (ret) 4443905b0ddaSMiao Xie return ret; 44445d13a37bSArne Jansen 44455d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4446905b0ddaSMiao Xie if (IS_ERR(sa)) { 4447905b0ddaSMiao Xie ret = PTR_ERR(sa); 4448905b0ddaSMiao Xie goto drop_write; 4449905b0ddaSMiao Xie } 44505d13a37bSArne Jansen 44515d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44525d13a37bSArne Jansen if (IS_ERR(trans)) { 44535d13a37bSArne Jansen ret = PTR_ERR(trans); 44545d13a37bSArne Jansen goto out; 44555d13a37bSArne Jansen } 44565d13a37bSArne Jansen 44575d13a37bSArne Jansen qgroupid = sa->qgroupid; 44585d13a37bSArne Jansen if (!qgroupid) { 44595d13a37bSArne Jansen /* take the current subvol as qgroup */ 44605d13a37bSArne Jansen qgroupid = root->root_key.objectid; 44615d13a37bSArne Jansen } 44625d13a37bSArne Jansen 44635d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 44645d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 44655d13a37bSArne Jansen 44665d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 44675d13a37bSArne Jansen if (err && !ret) 44685d13a37bSArne Jansen ret = err; 44695d13a37bSArne Jansen 44705d13a37bSArne Jansen out: 44715d13a37bSArne Jansen kfree(sa); 4472905b0ddaSMiao Xie drop_write: 4473905b0ddaSMiao Xie mnt_drop_write_file(file); 44745d13a37bSArne Jansen return ret; 44755d13a37bSArne Jansen } 44765d13a37bSArne Jansen 44772f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 44782f232036SJan Schmidt { 44796d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44802f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44812f232036SJan Schmidt int ret; 44822f232036SJan Schmidt 44832f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44842f232036SJan Schmidt return -EPERM; 44852f232036SJan Schmidt 44862f232036SJan Schmidt ret = mnt_want_write_file(file); 44872f232036SJan Schmidt if (ret) 44882f232036SJan Schmidt return ret; 44892f232036SJan Schmidt 44902f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44912f232036SJan Schmidt if (IS_ERR(qsa)) { 44922f232036SJan Schmidt ret = PTR_ERR(qsa); 44932f232036SJan Schmidt goto drop_write; 44942f232036SJan Schmidt } 44952f232036SJan Schmidt 44962f232036SJan Schmidt if (qsa->flags) { 44972f232036SJan Schmidt ret = -EINVAL; 44982f232036SJan Schmidt goto out; 44992f232036SJan Schmidt } 45002f232036SJan Schmidt 45012f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 45022f232036SJan Schmidt 45032f232036SJan Schmidt out: 45042f232036SJan Schmidt kfree(qsa); 45052f232036SJan Schmidt drop_write: 45062f232036SJan Schmidt mnt_drop_write_file(file); 45072f232036SJan Schmidt return ret; 45082f232036SJan Schmidt } 45092f232036SJan Schmidt 45102f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 45112f232036SJan Schmidt { 45126d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45132f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 45142f232036SJan Schmidt int ret = 0; 45152f232036SJan Schmidt 45162f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 45172f232036SJan Schmidt return -EPERM; 45182f232036SJan Schmidt 45192f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 45202f232036SJan Schmidt if (!qsa) 45212f232036SJan Schmidt return -ENOMEM; 45222f232036SJan Schmidt 45232f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 45242f232036SJan Schmidt qsa->flags = 1; 45252f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 45262f232036SJan Schmidt } 45272f232036SJan Schmidt 45282f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 45292f232036SJan Schmidt ret = -EFAULT; 45302f232036SJan Schmidt 45312f232036SJan Schmidt kfree(qsa); 45322f232036SJan Schmidt return ret; 45332f232036SJan Schmidt } 45342f232036SJan Schmidt 453557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 453657254b6eSJan Schmidt { 453754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 453857254b6eSJan Schmidt 453957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 454057254b6eSJan Schmidt return -EPERM; 454157254b6eSJan Schmidt 454257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 454357254b6eSJan Schmidt } 454457254b6eSJan Schmidt 4545abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4546abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 45478ea05e3aSAlexander Block { 4548496ad9aaSAl Viro struct inode *inode = file_inode(file); 45498ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 45508ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 45518ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 45528ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 45538ea05e3aSAlexander Block int ret = 0; 4554dd5f9615SStefan Behrens int received_uuid_changed; 45558ea05e3aSAlexander Block 4556bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4557bd60ea0fSDavid Sterba return -EPERM; 4558bd60ea0fSDavid Sterba 45598ea05e3aSAlexander Block ret = mnt_want_write_file(file); 45608ea05e3aSAlexander Block if (ret < 0) 45618ea05e3aSAlexander Block return ret; 45628ea05e3aSAlexander Block 45638ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 45648ea05e3aSAlexander Block 45658ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 45668ea05e3aSAlexander Block ret = -EINVAL; 45678ea05e3aSAlexander Block goto out; 45688ea05e3aSAlexander Block } 45698ea05e3aSAlexander Block 45708ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 45718ea05e3aSAlexander Block ret = -EROFS; 45728ea05e3aSAlexander Block goto out; 45738ea05e3aSAlexander Block } 45748ea05e3aSAlexander Block 4575dd5f9615SStefan Behrens /* 4576dd5f9615SStefan Behrens * 1 - root item 4577dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4578dd5f9615SStefan Behrens */ 4579dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 45808ea05e3aSAlexander Block if (IS_ERR(trans)) { 45818ea05e3aSAlexander Block ret = PTR_ERR(trans); 45828ea05e3aSAlexander Block trans = NULL; 45838ea05e3aSAlexander Block goto out; 45848ea05e3aSAlexander Block } 45858ea05e3aSAlexander Block 45868ea05e3aSAlexander Block sa->rtransid = trans->transid; 45878ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45888ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45898ea05e3aSAlexander Block 4590dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4591dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4592dd5f9615SStefan Behrens if (received_uuid_changed && 4593dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4594dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4595dd5f9615SStefan Behrens root_item->received_uuid, 4596dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4597dd5f9615SStefan Behrens root->root_key.objectid); 45988ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45998ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 46008ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 46013cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 46023cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 46033cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 46043cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 46058ea05e3aSAlexander Block 46068ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 46078ea05e3aSAlexander Block &root->root_key, &root->root_item); 46088ea05e3aSAlexander Block if (ret < 0) { 46098ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 46108ea05e3aSAlexander Block goto out; 4611dd5f9615SStefan Behrens } 4612dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4613dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4614dd5f9615SStefan Behrens sa->uuid, 4615dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4616dd5f9615SStefan Behrens root->root_key.objectid); 4617dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4618dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4619dd5f9615SStefan Behrens goto out; 4620dd5f9615SStefan Behrens } 4621dd5f9615SStefan Behrens } 46228ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4623dd5f9615SStefan Behrens if (ret < 0) { 4624dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 46258ea05e3aSAlexander Block goto out; 46268ea05e3aSAlexander Block } 46278ea05e3aSAlexander Block 4628abccd00fSHugo Mills out: 4629abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4630abccd00fSHugo Mills mnt_drop_write_file(file); 4631abccd00fSHugo Mills return ret; 4632abccd00fSHugo Mills } 4633abccd00fSHugo Mills 4634abccd00fSHugo Mills #ifdef CONFIG_64BIT 4635abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4636abccd00fSHugo Mills void __user *arg) 4637abccd00fSHugo Mills { 4638abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4639abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4640abccd00fSHugo Mills int ret = 0; 4641abccd00fSHugo Mills 4642abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4643abccd00fSHugo Mills if (IS_ERR(args32)) { 4644abccd00fSHugo Mills ret = PTR_ERR(args32); 4645abccd00fSHugo Mills args32 = NULL; 4646abccd00fSHugo Mills goto out; 4647abccd00fSHugo Mills } 4648abccd00fSHugo Mills 4649abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 465084dbeb87SDan Carpenter if (!args64) { 465184dbeb87SDan Carpenter ret = -ENOMEM; 4652abccd00fSHugo Mills goto out; 4653abccd00fSHugo Mills } 4654abccd00fSHugo Mills 4655abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4656abccd00fSHugo Mills args64->stransid = args32->stransid; 4657abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4658abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4659abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4660abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4661abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4662abccd00fSHugo Mills args64->flags = args32->flags; 4663abccd00fSHugo Mills 4664abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4665abccd00fSHugo Mills if (ret) 4666abccd00fSHugo Mills goto out; 4667abccd00fSHugo Mills 4668abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4669abccd00fSHugo Mills args32->stransid = args64->stransid; 4670abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4671abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4672abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4673abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4674abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4675abccd00fSHugo Mills args32->flags = args64->flags; 4676abccd00fSHugo Mills 4677abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4678abccd00fSHugo Mills if (ret) 4679abccd00fSHugo Mills ret = -EFAULT; 4680abccd00fSHugo Mills 4681abccd00fSHugo Mills out: 4682abccd00fSHugo Mills kfree(args32); 4683abccd00fSHugo Mills kfree(args64); 4684abccd00fSHugo Mills return ret; 4685abccd00fSHugo Mills } 4686abccd00fSHugo Mills #endif 4687abccd00fSHugo Mills 4688abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4689abccd00fSHugo Mills void __user *arg) 4690abccd00fSHugo Mills { 4691abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4692abccd00fSHugo Mills int ret = 0; 4693abccd00fSHugo Mills 4694abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4695abccd00fSHugo Mills if (IS_ERR(sa)) { 4696abccd00fSHugo Mills ret = PTR_ERR(sa); 4697abccd00fSHugo Mills sa = NULL; 4698abccd00fSHugo Mills goto out; 4699abccd00fSHugo Mills } 4700abccd00fSHugo Mills 4701abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4702abccd00fSHugo Mills 4703abccd00fSHugo Mills if (ret) 4704abccd00fSHugo Mills goto out; 4705abccd00fSHugo Mills 47068ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 47078ea05e3aSAlexander Block if (ret) 47088ea05e3aSAlexander Block ret = -EFAULT; 47098ea05e3aSAlexander Block 47108ea05e3aSAlexander Block out: 47118ea05e3aSAlexander Block kfree(sa); 47128ea05e3aSAlexander Block return ret; 47138ea05e3aSAlexander Block } 47148ea05e3aSAlexander Block 4715867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4716867ab667Sjeff.liu { 47176d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4718a1b83ac5SAnand Jain size_t len; 4719867ab667Sjeff.liu int ret; 4720a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4721a1b83ac5SAnand Jain 4722a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4723a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4724a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4725a1b83ac5SAnand Jain 4726a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4727867ab667Sjeff.liu 4728867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4729efe120a0SFrank Holton btrfs_warn(root->fs_info, 4730efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 4731867ab667Sjeff.liu } 4732867ab667Sjeff.liu 4733867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4734867ab667Sjeff.liu 4735867ab667Sjeff.liu return ret ? -EFAULT : 0; 4736867ab667Sjeff.liu } 4737867ab667Sjeff.liu 4738a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4739a8bfd4abSjeff.liu { 47406d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4741a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4742a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4743a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4744a8bfd4abSjeff.liu int ret; 4745a8bfd4abSjeff.liu 4746a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4747a8bfd4abSjeff.liu return -EPERM; 4748a8bfd4abSjeff.liu 4749a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4750a8bfd4abSjeff.liu return -EFAULT; 4751a8bfd4abSjeff.liu 4752a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4753efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 4754a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4755a8bfd4abSjeff.liu return -EINVAL; 4756a8bfd4abSjeff.liu } 4757a8bfd4abSjeff.liu 4758a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4759a8bfd4abSjeff.liu if (ret) 4760a8bfd4abSjeff.liu return ret; 4761a8bfd4abSjeff.liu 4762a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4763a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4764a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4765a8bfd4abSjeff.liu goto out_unlock; 4766a8bfd4abSjeff.liu } 4767a8bfd4abSjeff.liu 4768a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4769a8bfd4abSjeff.liu strcpy(super_block->label, label); 4770a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4771d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 4772a8bfd4abSjeff.liu 4773a8bfd4abSjeff.liu out_unlock: 4774a8bfd4abSjeff.liu mnt_drop_write_file(file); 4775a8bfd4abSjeff.liu return ret; 4776a8bfd4abSjeff.liu } 4777a8bfd4abSjeff.liu 47782eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 47792eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 47802eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 47812eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 47822eaa055fSJeff Mahoney 47832eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 47842eaa055fSJeff Mahoney void __user *arg) 47852eaa055fSJeff Mahoney { 47862eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 47872eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 47882eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47892eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47902eaa055fSJeff Mahoney }; 47912eaa055fSJeff Mahoney 47922eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47932eaa055fSJeff Mahoney return -EFAULT; 47942eaa055fSJeff Mahoney 47952eaa055fSJeff Mahoney return 0; 47962eaa055fSJeff Mahoney } 47972eaa055fSJeff Mahoney 47982eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 47992eaa055fSJeff Mahoney { 48002eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48012eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 48022eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 48032eaa055fSJeff Mahoney 48042eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 48052eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 48062eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 48072eaa055fSJeff Mahoney 48082eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 48092eaa055fSJeff Mahoney return -EFAULT; 48102eaa055fSJeff Mahoney 48112eaa055fSJeff Mahoney return 0; 48122eaa055fSJeff Mahoney } 48132eaa055fSJeff Mahoney 48143b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 48153b02a68aSJeff Mahoney enum btrfs_feature_set set, 48162eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 48172eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 48182eaa055fSJeff Mahoney { 48193b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 48203b02a68aSJeff Mahoney char *names; 48212eaa055fSJeff Mahoney u64 disallowed, unsupported; 48222eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 48232eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 48242eaa055fSJeff Mahoney 48252eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 48262eaa055fSJeff Mahoney if (unsupported) { 48273b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 48283b02a68aSJeff Mahoney if (names) { 48293b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 48303b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 48313b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48323b02a68aSJeff Mahoney kfree(names); 48333b02a68aSJeff Mahoney } else 48342eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 48352eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 48362eaa055fSJeff Mahoney type, unsupported); 48372eaa055fSJeff Mahoney return -EOPNOTSUPP; 48382eaa055fSJeff Mahoney } 48392eaa055fSJeff Mahoney 48402eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 48412eaa055fSJeff Mahoney if (disallowed) { 48423b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 48433b02a68aSJeff Mahoney if (names) { 48443b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 48453b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 48463b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48473b02a68aSJeff Mahoney kfree(names); 48483b02a68aSJeff Mahoney } else 48492eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 48502eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 48512eaa055fSJeff Mahoney type, disallowed); 48522eaa055fSJeff Mahoney return -EPERM; 48532eaa055fSJeff Mahoney } 48542eaa055fSJeff Mahoney 48552eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 48562eaa055fSJeff Mahoney if (disallowed) { 48573b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 48583b02a68aSJeff Mahoney if (names) { 48593b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 48603b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 48613b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48623b02a68aSJeff Mahoney kfree(names); 48633b02a68aSJeff Mahoney } else 48642eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 48652eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 48662eaa055fSJeff Mahoney type, disallowed); 48672eaa055fSJeff Mahoney return -EPERM; 48682eaa055fSJeff Mahoney } 48692eaa055fSJeff Mahoney 48702eaa055fSJeff Mahoney return 0; 48712eaa055fSJeff Mahoney } 48722eaa055fSJeff Mahoney 48732eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 48743b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 48752eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 48762eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 48772eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 48782eaa055fSJeff Mahoney 48792eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 48802eaa055fSJeff Mahoney { 48812eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48822eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 48832eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 48842eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 48852eaa055fSJeff Mahoney u64 newflags; 48862eaa055fSJeff Mahoney int ret; 48872eaa055fSJeff Mahoney 48882eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48892eaa055fSJeff Mahoney return -EPERM; 48902eaa055fSJeff Mahoney 48912eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48922eaa055fSJeff Mahoney return -EFAULT; 48932eaa055fSJeff Mahoney 48942eaa055fSJeff Mahoney /* Nothing to do */ 48952eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48962eaa055fSJeff Mahoney !flags[0].incompat_flags) 48972eaa055fSJeff Mahoney return 0; 48982eaa055fSJeff Mahoney 48992eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 49002eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 49012eaa055fSJeff Mahoney if (ret) 49022eaa055fSJeff Mahoney return ret; 49032eaa055fSJeff Mahoney 49042eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 49052eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 49062eaa055fSJeff Mahoney if (ret) 49072eaa055fSJeff Mahoney return ret; 49082eaa055fSJeff Mahoney 49092eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 49102eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 49112eaa055fSJeff Mahoney if (ret) 49122eaa055fSJeff Mahoney return ret; 49132eaa055fSJeff Mahoney 49148051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 49152eaa055fSJeff Mahoney if (IS_ERR(trans)) 49162eaa055fSJeff Mahoney return PTR_ERR(trans); 49172eaa055fSJeff Mahoney 49182eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 49192eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 49202eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 49212eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 49222eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 49232eaa055fSJeff Mahoney 49242eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 49252eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 49262eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 49272eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 49282eaa055fSJeff Mahoney 49292eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 49302eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 49312eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 49322eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 49332eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 49342eaa055fSJeff Mahoney 4935d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 49362eaa055fSJeff Mahoney } 49372eaa055fSJeff Mahoney 4938f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4939f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4940f46b5a66SChristoph Hellwig { 4941496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49424bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4943f46b5a66SChristoph Hellwig 4944f46b5a66SChristoph Hellwig switch (cmd) { 49456cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 49466cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 49476cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 49486cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 49496cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49506cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4951f7039b1dSLi Dongyang case FITRIM: 4952f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4953f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4954fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4955fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4956fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49573de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4958fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49596f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49606f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 496176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 496276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 49630caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49640caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49650caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49660caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49676ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49686ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4969f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49701e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49711e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49721e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4973f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4974198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4975f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49764bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4977f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4978da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4979475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4980475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4981475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4982475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4983f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49849ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4985f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4986c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4987c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 49887a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4989f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4990f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4991f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4992f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4993ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4994ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4995ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4996ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4997d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4998d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4999d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5000d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 50011406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 50021406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 50039b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 50049b199859SFilipe David Borba Manana int ret; 50059b199859SFilipe David Borba Manana 50066c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 50079b199859SFilipe David Borba Manana if (ret) 50089b199859SFilipe David Borba Manana return ret; 50099b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 50109b199859SFilipe David Borba Manana return ret; 50119b199859SFilipe David Borba Manana } 501246204592SSage Weil case BTRFS_IOC_START_SYNC: 50139a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 501446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 50159a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5016475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5017b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5018475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5019475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5020475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5021475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5022c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 50239ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5024837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5025837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 502619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 502719a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 50288ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 50298ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5030abccd00fSHugo Mills #ifdef CONFIG_64BIT 5031abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5032abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5033abccd00fSHugo Mills #endif 503431db9f7cSAlexander Block case BTRFS_IOC_SEND: 503531db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5036c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5037b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 50385d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5039905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50405d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5041905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50425d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5043905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50445d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5045905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50462f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50472f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50482f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 50492f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 505057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 505157254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 50523f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50533f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5054867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5055867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5056a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5057a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5058416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5059416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 50602eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 50612eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 50622eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 50632eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 50642eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50652eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5066f46b5a66SChristoph Hellwig } 5067f46b5a66SChristoph Hellwig 5068f46b5a66SChristoph Hellwig return -ENOTTY; 5069f46b5a66SChristoph Hellwig } 5070