1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 5963541927SFilipe David Borba Manana #include "props.h" 603b02a68aSJeff Mahoney #include "sysfs.h" 61f46b5a66SChristoph Hellwig 62*abccd00fSHugo Mills #ifdef CONFIG_64BIT 63*abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 64*abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 65*abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 66*abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 67*abccd00fSHugo Mills */ 68*abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 69*abccd00fSHugo Mills __u64 sec; 70*abccd00fSHugo Mills __u32 nsec; 71*abccd00fSHugo Mills } __attribute__ ((__packed__)); 72*abccd00fSHugo Mills 73*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 74*abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 75*abccd00fSHugo Mills __u64 stransid; /* in */ 76*abccd00fSHugo Mills __u64 rtransid; /* out */ 77*abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 78*abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 79*abccd00fSHugo Mills __u64 flags; /* in */ 80*abccd00fSHugo Mills __u64 reserved[16]; /* in */ 81*abccd00fSHugo Mills } __attribute__ ((__packed__)); 82*abccd00fSHugo Mills 83*abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 84*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 85*abccd00fSHugo Mills #endif 86*abccd00fSHugo Mills 87*abccd00fSHugo Mills 88416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 89416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 90416161dbSMark Fasheh 916cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 926cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 936cbff00fSChristoph Hellwig { 946cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 956cbff00fSChristoph Hellwig return flags; 966cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 1036cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1046cbff00fSChristoph Hellwig */ 1056cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1066cbff00fSChristoph Hellwig { 1076cbff00fSChristoph Hellwig unsigned int iflags = 0; 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1116cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1136cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1166cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1186cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1206cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 121d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 122d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 123d0092bddSLi Zefan 124d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 125d0092bddSLi Zefan iflags |= FS_COMPR_FL; 126d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 127d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1286cbff00fSChristoph Hellwig 1296cbff00fSChristoph Hellwig return iflags; 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig /* 1336cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1346cbff00fSChristoph Hellwig */ 1356cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1366cbff00fSChristoph Hellwig { 1376cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1386cbff00fSChristoph Hellwig 1396cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1426cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1436cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1446cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1456cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1466cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1476cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1486cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1496cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1506cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1516cbff00fSChristoph Hellwig } 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig /* 1546cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1556cbff00fSChristoph Hellwig * 156e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1576cbff00fSChristoph Hellwig */ 1586cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1596cbff00fSChristoph Hellwig { 1600b4dcea5SChris Mason unsigned int flags; 1610b4dcea5SChris Mason 1620b4dcea5SChris Mason if (!dir) 1630b4dcea5SChris Mason return; 1640b4dcea5SChris Mason 1650b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1666cbff00fSChristoph Hellwig 167e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 168e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 169e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 170e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 171e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 172e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 173e27425d6SJosef Bacik } 1746cbff00fSChristoph Hellwig 175213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 176e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 177213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 178213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 179213490b3SLiu Bo } 180e27425d6SJosef Bacik 1816cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1826cbff00fSChristoph Hellwig } 1836cbff00fSChristoph Hellwig 1846cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1856cbff00fSChristoph Hellwig { 186496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1876cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1886cbff00fSChristoph Hellwig 1896cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1906cbff00fSChristoph Hellwig return -EFAULT; 1916cbff00fSChristoph Hellwig return 0; 1926cbff00fSChristoph Hellwig } 1936cbff00fSChristoph Hellwig 19475e7cb7fSLiu Bo static int check_flags(unsigned int flags) 19575e7cb7fSLiu Bo { 19675e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19775e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19875e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 199e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 200e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20175e7cb7fSLiu Bo return -EOPNOTSUPP; 20275e7cb7fSLiu Bo 20375e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20475e7cb7fSLiu Bo return -EINVAL; 20575e7cb7fSLiu Bo 20675e7cb7fSLiu Bo return 0; 20775e7cb7fSLiu Bo } 20875e7cb7fSLiu Bo 2096cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2106cbff00fSChristoph Hellwig { 211496ad9aaSAl Viro struct inode *inode = file_inode(file); 2126cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2136cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2146cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2156cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2166cbff00fSChristoph Hellwig int ret; 217f062abf0SLi Zefan u64 ip_oldflags; 218f062abf0SLi Zefan unsigned int i_oldflags; 2197e97b8daSDavid Sterba umode_t mode; 2206cbff00fSChristoph Hellwig 221bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 222bd60ea0fSDavid Sterba return -EPERM; 223bd60ea0fSDavid Sterba 224b83cc969SLi Zefan if (btrfs_root_readonly(root)) 225b83cc969SLi Zefan return -EROFS; 226b83cc969SLi Zefan 2276cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2286cbff00fSChristoph Hellwig return -EFAULT; 2296cbff00fSChristoph Hellwig 23075e7cb7fSLiu Bo ret = check_flags(flags); 23175e7cb7fSLiu Bo if (ret) 23275e7cb7fSLiu Bo return ret; 2336cbff00fSChristoph Hellwig 234e7848683SJan Kara ret = mnt_want_write_file(file); 235e7848683SJan Kara if (ret) 236e7848683SJan Kara return ret; 237e7848683SJan Kara 2386cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2396cbff00fSChristoph Hellwig 240f062abf0SLi Zefan ip_oldflags = ip->flags; 241f062abf0SLi Zefan i_oldflags = inode->i_flags; 2427e97b8daSDavid Sterba mode = inode->i_mode; 243f062abf0SLi Zefan 2446cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2456cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2466cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2476cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2486cbff00fSChristoph Hellwig ret = -EPERM; 2496cbff00fSChristoph Hellwig goto out_unlock; 2506cbff00fSChristoph Hellwig } 2516cbff00fSChristoph Hellwig } 2526cbff00fSChristoph Hellwig 2536cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2546cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2556cbff00fSChristoph Hellwig else 2566cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2576cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2586cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2596cbff00fSChristoph Hellwig else 2606cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2616cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2626cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2636cbff00fSChristoph Hellwig else 2646cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2656cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2666cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2676cbff00fSChristoph Hellwig else 2686cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2696cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2706cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2716cbff00fSChristoph Hellwig else 2726cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2736cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2746cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2756cbff00fSChristoph Hellwig else 2766cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2777e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2787e97b8daSDavid Sterba if (S_ISREG(mode)) { 2797e97b8daSDavid Sterba /* 2807e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2817e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2827e97b8daSDavid Sterba * status of the file and will not set it. 2837e97b8daSDavid Sterba */ 2847e97b8daSDavid Sterba if (inode->i_size == 0) 2857e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2867e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2877e97b8daSDavid Sterba } else { 288e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2897e97b8daSDavid Sterba } 2907e97b8daSDavid Sterba } else { 2917e97b8daSDavid Sterba /* 2927e97b8daSDavid Sterba * Revert back under same assuptions as above 2937e97b8daSDavid Sterba */ 2947e97b8daSDavid Sterba if (S_ISREG(mode)) { 2957e97b8daSDavid Sterba if (inode->i_size == 0) 2967e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2977e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2987e97b8daSDavid Sterba } else { 299e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3007e97b8daSDavid Sterba } 3017e97b8daSDavid Sterba } 3026cbff00fSChristoph Hellwig 30375e7cb7fSLiu Bo /* 30475e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30575e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30675e7cb7fSLiu Bo * things smaller. 30775e7cb7fSLiu Bo */ 30875e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 30975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31075e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31163541927SFilipe David Borba Manana 31263541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31363541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31463541927SFilipe David Borba Manana goto out_drop; 31575e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 31663541927SFilipe David Borba Manana const char *comp; 31763541927SFilipe David Borba Manana 31875e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 31975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32063541927SFilipe David Borba Manana 32163541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32263541927SFilipe David Borba Manana comp = "lzo"; 32363541927SFilipe David Borba Manana else 32463541927SFilipe David Borba Manana comp = "zlib"; 32563541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 32663541927SFilipe David Borba Manana comp, strlen(comp), 0); 32763541927SFilipe David Borba Manana if (ret) 32863541927SFilipe David Borba Manana goto out_drop; 32963541927SFilipe David Borba Manana 330ebcb904dSLi Zefan } else { 331ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 33275e7cb7fSLiu Bo } 3336cbff00fSChristoph Hellwig 3344da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 335f062abf0SLi Zefan if (IS_ERR(trans)) { 336f062abf0SLi Zefan ret = PTR_ERR(trans); 337f062abf0SLi Zefan goto out_drop; 338f062abf0SLi Zefan } 3396cbff00fSChristoph Hellwig 340306424ccSLi Zefan btrfs_update_iflags(inode); 3410c4d2d95SJosef Bacik inode_inc_iversion(inode); 342306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3436cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3446cbff00fSChristoph Hellwig 3456cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 346f062abf0SLi Zefan out_drop: 347f062abf0SLi Zefan if (ret) { 348f062abf0SLi Zefan ip->flags = ip_oldflags; 349f062abf0SLi Zefan inode->i_flags = i_oldflags; 350f062abf0SLi Zefan } 3516cbff00fSChristoph Hellwig 3526cbff00fSChristoph Hellwig out_unlock: 3536cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 354e7848683SJan Kara mnt_drop_write_file(file); 3552d4e6f6aSliubo return ret; 3566cbff00fSChristoph Hellwig } 3576cbff00fSChristoph Hellwig 3586cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3596cbff00fSChristoph Hellwig { 360496ad9aaSAl Viro struct inode *inode = file_inode(file); 3616cbff00fSChristoph Hellwig 3626cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3636cbff00fSChristoph Hellwig } 364f46b5a66SChristoph Hellwig 365f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 366f7039b1dSLi Dongyang { 36754563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 368f7039b1dSLi Dongyang struct btrfs_device *device; 369f7039b1dSLi Dongyang struct request_queue *q; 370f7039b1dSLi Dongyang struct fstrim_range range; 371f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 372f7039b1dSLi Dongyang u64 num_devices = 0; 373815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 374f7039b1dSLi Dongyang int ret; 375f7039b1dSLi Dongyang 376f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 377f7039b1dSLi Dongyang return -EPERM; 378f7039b1dSLi Dongyang 3791f78160cSXiao Guangrong rcu_read_lock(); 3801f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3811f78160cSXiao Guangrong dev_list) { 382f7039b1dSLi Dongyang if (!device->bdev) 383f7039b1dSLi Dongyang continue; 384f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 385f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 386f7039b1dSLi Dongyang num_devices++; 387f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 388f7039b1dSLi Dongyang minlen); 389f7039b1dSLi Dongyang } 390f7039b1dSLi Dongyang } 3911f78160cSXiao Guangrong rcu_read_unlock(); 392f4c697e6SLukas Czerner 393f7039b1dSLi Dongyang if (!num_devices) 394f7039b1dSLi Dongyang return -EOPNOTSUPP; 395f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 396f7039b1dSLi Dongyang return -EFAULT; 397e515c18bSLukas Czerner if (range.start > total_bytes || 398e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 399f4c697e6SLukas Czerner return -EINVAL; 400f7039b1dSLi Dongyang 401f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 402f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 403815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 404f7039b1dSLi Dongyang if (ret < 0) 405f7039b1dSLi Dongyang return ret; 406f7039b1dSLi Dongyang 407f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 408f7039b1dSLi Dongyang return -EFAULT; 409f7039b1dSLi Dongyang 410f7039b1dSLi Dongyang return 0; 411f7039b1dSLi Dongyang } 412f7039b1dSLi Dongyang 413dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 414dd5f9615SStefan Behrens { 41546e0f66aSChris Mason int i; 41646e0f66aSChris Mason 41746e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 41846e0f66aSChris Mason if (uuid[i]) 41946e0f66aSChris Mason return 0; 42046e0f66aSChris Mason } 42146e0f66aSChris Mason return 1; 422dd5f9615SStefan Behrens } 423dd5f9615SStefan Behrens 424d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 425cb8e7090SChristoph Hellwig struct dentry *dentry, 42672fd032eSSage Weil char *name, int namelen, 4276f72c7e2SArne Jansen u64 *async_transid, 4288696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 429f46b5a66SChristoph Hellwig { 430f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 431f46b5a66SChristoph Hellwig struct btrfs_key key; 432f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 433f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 434f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 435d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 43676dda93cSYan, Zheng struct btrfs_root *new_root; 437d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4388ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4395662344bSTsutomu Itoh struct inode *inode; 440f46b5a66SChristoph Hellwig int ret; 441f46b5a66SChristoph Hellwig int err; 442f46b5a66SChristoph Hellwig u64 objectid; 443f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4443de4586cSChris Mason u64 index = 0; 445d5c12070SMiao Xie u64 qgroup_reserved; 4468ea05e3aSAlexander Block uuid_le new_uuid; 447f46b5a66SChristoph Hellwig 448581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4492fbe8c8aSAl Viro if (ret) 450a22285a6SYan, Zheng return ret; 4516a912213SJosef Bacik 452d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4539ed74f2dSJosef Bacik /* 454d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 455d5c12070SMiao Xie * of create_snapshot(). 4569ed74f2dSJosef Bacik */ 457d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 458dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 459d5c12070SMiao Xie if (ret) 460d5c12070SMiao Xie return ret; 461f46b5a66SChristoph Hellwig 462d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 463d5c12070SMiao Xie if (IS_ERR(trans)) { 464d5c12070SMiao Xie ret = PTR_ERR(trans); 465de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 466de6e8200SLiu Bo qgroup_reserved); 467de6e8200SLiu Bo return ret; 468d5c12070SMiao Xie } 469d5c12070SMiao Xie trans->block_rsv = &block_rsv; 470d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 471f46b5a66SChristoph Hellwig 4728696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4736f72c7e2SArne Jansen if (ret) 4746f72c7e2SArne Jansen goto fail; 4756f72c7e2SArne Jansen 4765d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4775581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4788e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4798e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4808e8a1e31SJosef Bacik goto fail; 4818e8a1e31SJosef Bacik } 482f46b5a66SChristoph Hellwig 4835d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 484f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 485f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4865d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 487f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 488f46b5a66SChristoph Hellwig 4890a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 490f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4915d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 492b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4935d4f98a2SYan Zheng BTRFS_UUID_SIZE); 494f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 495f46b5a66SChristoph Hellwig 4968ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4978ea05e3aSAlexander Block 498f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4993cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5003cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5013cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 5023cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 5033cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 504f46b5a66SChristoph Hellwig 5053cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5063cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5073cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 50808fe4db1SLi Zefan 509f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 51084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 511f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 512f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 51386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 51480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 515f46b5a66SChristoph Hellwig 5168ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5178ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5188ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5198ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5203cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5213cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5228ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5238ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5248ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 525f46b5a66SChristoph Hellwig 526925baeddSChris Mason btrfs_tree_unlock(leaf); 527f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 528f46b5a66SChristoph Hellwig leaf = NULL; 529f46b5a66SChristoph Hellwig 530f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig key.objectid = objectid; 5335d4f98a2SYan Zheng key.offset = 0; 534f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 535f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 536f46b5a66SChristoph Hellwig &root_item); 537f46b5a66SChristoph Hellwig if (ret) 538f46b5a66SChristoph Hellwig goto fail; 539f46b5a66SChristoph Hellwig 54076dda93cSYan, Zheng key.offset = (u64)-1; 54176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 54279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 54379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 54479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 54579787eaaSJeff Mahoney goto fail; 54679787eaaSJeff Mahoney } 54776dda93cSYan, Zheng 54876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 54976dda93cSYan, Zheng 55063541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 551ce598979SMark Fasheh if (ret) { 552ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 55379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 554ce598979SMark Fasheh goto fail; 555ce598979SMark Fasheh } 556ce598979SMark Fasheh 557f46b5a66SChristoph Hellwig /* 558f46b5a66SChristoph Hellwig * insert the directory item 559f46b5a66SChristoph Hellwig */ 5603de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 56179787eaaSJeff Mahoney if (ret) { 56279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 56379787eaaSJeff Mahoney goto fail; 56479787eaaSJeff Mahoney } 5653de4586cSChris Mason 5663de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 56716cdcec7SMiao Xie name, namelen, dir, &key, 5683de4586cSChris Mason BTRFS_FT_DIR, index); 56979787eaaSJeff Mahoney if (ret) { 57079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 571f46b5a66SChristoph Hellwig goto fail; 57279787eaaSJeff Mahoney } 5730660b5afSChris Mason 57452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 57552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 57652c26179SYan Zheng BUG_ON(ret); 57752c26179SYan Zheng 5780660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5794df27c4dSYan, Zheng objectid, root->root_key.objectid, 58033345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5810660b5afSChris Mason BUG_ON(ret); 5820660b5afSChris Mason 583dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 584dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 585dd5f9615SStefan Behrens objectid); 586dd5f9615SStefan Behrens if (ret) 587dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 588dd5f9615SStefan Behrens 589f46b5a66SChristoph Hellwig fail: 590d5c12070SMiao Xie trans->block_rsv = NULL; 591d5c12070SMiao Xie trans->bytes_reserved = 0; 592de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 593de6e8200SLiu Bo 59472fd032eSSage Weil if (async_transid) { 59572fd032eSSage Weil *async_transid = trans->transid; 59672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 59700d71c9cSMiao Xie if (err) 59800d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 59972fd032eSSage Weil } else { 60076dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 60172fd032eSSage Weil } 602f46b5a66SChristoph Hellwig if (err && !ret) 603f46b5a66SChristoph Hellwig ret = err; 6041a65e24bSChris Mason 6055662344bSTsutomu Itoh if (!ret) { 6065662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 607de6e8200SLiu Bo if (IS_ERR(inode)) 608de6e8200SLiu Bo return PTR_ERR(inode); 6095662344bSTsutomu Itoh d_instantiate(dentry, inode); 6105662344bSTsutomu Itoh } 611f46b5a66SChristoph Hellwig return ret; 612f46b5a66SChristoph Hellwig } 613f46b5a66SChristoph Hellwig 614e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 615e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 616e9662f70SMiao Xie u64 *async_transid, bool readonly, 617e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 618f46b5a66SChristoph Hellwig { 6192e4bfab9SYan, Zheng struct inode *inode; 620f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 621f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6222e4bfab9SYan, Zheng int ret; 623f46b5a66SChristoph Hellwig 624f46b5a66SChristoph Hellwig if (!root->ref_cows) 625f46b5a66SChristoph Hellwig return -EINVAL; 626f46b5a66SChristoph Hellwig 6276a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6286a03843dSMiao Xie if (ret) 6296a03843dSMiao Xie return ret; 6306a03843dSMiao Xie 631b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6326a03843dSMiao Xie 633a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 634a22285a6SYan, Zheng if (!pending_snapshot) 635a22285a6SYan, Zheng return -ENOMEM; 636a22285a6SYan, Zheng 63766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 63866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 639d5c12070SMiao Xie /* 640d5c12070SMiao Xie * 1 - parent dir inode 641d5c12070SMiao Xie * 2 - dir entries 642d5c12070SMiao Xie * 1 - root item 643d5c12070SMiao Xie * 2 - root ref/backref 644d5c12070SMiao Xie * 1 - root of snapshot 645dd5f9615SStefan Behrens * 1 - UUID item 646d5c12070SMiao Xie */ 647d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 648dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 649ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 650ee3441b4SJeff Mahoney false); 651d5c12070SMiao Xie if (ret) 652d5c12070SMiao Xie goto out; 653d5c12070SMiao Xie 654a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 655a22285a6SYan, Zheng pending_snapshot->root = root; 656b83cc969SLi Zefan pending_snapshot->readonly = readonly; 657e9662f70SMiao Xie pending_snapshot->dir = dir; 6588696c533SMiao Xie pending_snapshot->inherit = inherit; 659a22285a6SYan, Zheng 660d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 661a22285a6SYan, Zheng if (IS_ERR(trans)) { 662a22285a6SYan, Zheng ret = PTR_ERR(trans); 663a22285a6SYan, Zheng goto fail; 664a22285a6SYan, Zheng } 665a22285a6SYan, Zheng 6668351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 667a22285a6SYan, Zheng list_add(&pending_snapshot->list, 668a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6698351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 67072fd032eSSage Weil if (async_transid) { 67172fd032eSSage Weil *async_transid = trans->transid; 67272fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 67372fd032eSSage Weil root->fs_info->extent_root, 1); 67400d71c9cSMiao Xie if (ret) 67500d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 67672fd032eSSage Weil } else { 67772fd032eSSage Weil ret = btrfs_commit_transaction(trans, 67872fd032eSSage Weil root->fs_info->extent_root); 67972fd032eSSage Weil } 680aec8030aSMiao Xie if (ret) 681c37b2b62SJosef Bacik goto fail; 682a22285a6SYan, Zheng 683a22285a6SYan, Zheng ret = pending_snapshot->error; 684f46b5a66SChristoph Hellwig if (ret) 6852e4bfab9SYan, Zheng goto fail; 686f46b5a66SChristoph Hellwig 68766b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 68866b4ffd1SJosef Bacik if (ret) 68966b4ffd1SJosef Bacik goto fail; 690f46b5a66SChristoph Hellwig 6912fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 6922e4bfab9SYan, Zheng if (IS_ERR(inode)) { 6932e4bfab9SYan, Zheng ret = PTR_ERR(inode); 6942e4bfab9SYan, Zheng goto fail; 6952e4bfab9SYan, Zheng } 6965662344bSTsutomu Itoh 6972e4bfab9SYan, Zheng d_instantiate(dentry, inode); 6982e4bfab9SYan, Zheng ret = 0; 6992e4bfab9SYan, Zheng fail: 700d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 701d5c12070SMiao Xie &pending_snapshot->block_rsv, 702d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 703d5c12070SMiao Xie out: 704a22285a6SYan, Zheng kfree(pending_snapshot); 705f46b5a66SChristoph Hellwig return ret; 706f46b5a66SChristoph Hellwig } 707f46b5a66SChristoph Hellwig 7084260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 7094260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 7104260f7c7SSage Weil * minimal. 7114260f7c7SSage Weil */ 7124260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 7134260f7c7SSage Weil { 7142f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 7154260f7c7SSage Weil 7164260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 7174260f7c7SSage Weil return 0; 7182f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 7194260f7c7SSage Weil return 0; 7202f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 7214260f7c7SSage Weil return 0; 7224260f7c7SSage Weil return !capable(CAP_FOWNER); 7234260f7c7SSage Weil } 7244260f7c7SSage Weil 7254260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7264260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7274260f7c7SSage Weil * whether the type of victim is right. 7284260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7294260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7304260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7314260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7324260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7334260f7c7SSage Weil * a. be owner of dir, or 7344260f7c7SSage Weil * b. be owner of victim, or 7354260f7c7SSage Weil * c. have CAP_FOWNER capability 7364260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7374260f7c7SSage Weil * links pointing to it. 7384260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7394260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7404260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7414260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7424260f7c7SSage Weil * nfs_async_unlink(). 7434260f7c7SSage Weil */ 7444260f7c7SSage Weil 7454260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7464260f7c7SSage Weil { 7474260f7c7SSage Weil int error; 7484260f7c7SSage Weil 7494260f7c7SSage Weil if (!victim->d_inode) 7504260f7c7SSage Weil return -ENOENT; 7514260f7c7SSage Weil 7524260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7534fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7544260f7c7SSage Weil 7554260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7564260f7c7SSage Weil if (error) 7574260f7c7SSage Weil return error; 7584260f7c7SSage Weil if (IS_APPEND(dir)) 7594260f7c7SSage Weil return -EPERM; 7604260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7614260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7624260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7634260f7c7SSage Weil return -EPERM; 7644260f7c7SSage Weil if (isdir) { 7654260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7664260f7c7SSage Weil return -ENOTDIR; 7674260f7c7SSage Weil if (IS_ROOT(victim)) 7684260f7c7SSage Weil return -EBUSY; 7694260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7704260f7c7SSage Weil return -EISDIR; 7714260f7c7SSage Weil if (IS_DEADDIR(dir)) 7724260f7c7SSage Weil return -ENOENT; 7734260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7744260f7c7SSage Weil return -EBUSY; 7754260f7c7SSage Weil return 0; 7764260f7c7SSage Weil } 7774260f7c7SSage Weil 778cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 779cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 780cb8e7090SChristoph Hellwig { 781cb8e7090SChristoph Hellwig if (child->d_inode) 782cb8e7090SChristoph Hellwig return -EEXIST; 783cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 784cb8e7090SChristoph Hellwig return -ENOENT; 785cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 786cb8e7090SChristoph Hellwig } 787cb8e7090SChristoph Hellwig 788cb8e7090SChristoph Hellwig /* 789cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 790cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 791cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 792cb8e7090SChristoph Hellwig */ 79376dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 79476dda93cSYan, Zheng char *name, int namelen, 79572fd032eSSage Weil struct btrfs_root *snap_src, 7966f72c7e2SArne Jansen u64 *async_transid, bool readonly, 7978696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 798cb8e7090SChristoph Hellwig { 79976dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 800cb8e7090SChristoph Hellwig struct dentry *dentry; 801cb8e7090SChristoph Hellwig int error; 802cb8e7090SChristoph Hellwig 8035c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8045c50c9b8SDavid Sterba if (error == -EINTR) 8055c50c9b8SDavid Sterba return error; 806cb8e7090SChristoph Hellwig 807cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 808cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 809cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 810cb8e7090SChristoph Hellwig goto out_unlock; 811cb8e7090SChristoph Hellwig 812cb8e7090SChristoph Hellwig error = -EEXIST; 813cb8e7090SChristoph Hellwig if (dentry->d_inode) 814cb8e7090SChristoph Hellwig goto out_dput; 815cb8e7090SChristoph Hellwig 81676dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 817cb8e7090SChristoph Hellwig if (error) 818a874a63eSLiu Bo goto out_dput; 819cb8e7090SChristoph Hellwig 8209c52057cSChris Mason /* 8219c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8229c52057cSChris Mason * check for them now when we can safely fail 8239c52057cSChris Mason */ 8249c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8259c52057cSChris Mason dir->i_ino, name, 8269c52057cSChris Mason namelen); 8279c52057cSChris Mason if (error) 8289c52057cSChris Mason goto out_dput; 8299c52057cSChris Mason 83076dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 83176dda93cSYan, Zheng 83276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 83376dda93cSYan, Zheng goto out_up_read; 83476dda93cSYan, Zheng 8353de4586cSChris Mason if (snap_src) { 836e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8376f72c7e2SArne Jansen async_transid, readonly, inherit); 8383de4586cSChris Mason } else { 839d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 840d5c12070SMiao Xie async_transid, inherit); 8413de4586cSChris Mason } 84276dda93cSYan, Zheng if (!error) 84376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 84476dda93cSYan, Zheng out_up_read: 84576dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 846cb8e7090SChristoph Hellwig out_dput: 847cb8e7090SChristoph Hellwig dput(dentry); 848cb8e7090SChristoph Hellwig out_unlock: 84976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 850cb8e7090SChristoph Hellwig return error; 851cb8e7090SChristoph Hellwig } 852cb8e7090SChristoph Hellwig 8534cb5300bSChris Mason /* 8544cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8554cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8564cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8574cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8584cb5300bSChris Mason * part of the file 8594cb5300bSChris Mason */ 8604cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8614cb5300bSChris Mason { 8624cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8634cb5300bSChris Mason struct extent_map *em = NULL; 8644cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8654cb5300bSChris Mason u64 end; 8664cb5300bSChris Mason 8674cb5300bSChris Mason read_lock(&em_tree->lock); 8684cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8694cb5300bSChris Mason read_unlock(&em_tree->lock); 8704cb5300bSChris Mason 8714cb5300bSChris Mason if (em) { 8724cb5300bSChris Mason end = extent_map_end(em); 8734cb5300bSChris Mason free_extent_map(em); 8744cb5300bSChris Mason if (end - offset > thresh) 8754cb5300bSChris Mason return 0; 8764cb5300bSChris Mason } 8774cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8784cb5300bSChris Mason thresh /= 2; 8794cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8804cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8814cb5300bSChris Mason if (end >= thresh) 8824cb5300bSChris Mason return 0; 8834cb5300bSChris Mason return 1; 8844cb5300bSChris Mason } 8854cb5300bSChris Mason 8864cb5300bSChris Mason /* 8874cb5300bSChris Mason * helper function to walk through a file and find extents 8884cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 8894cb5300bSChris Mason * 8904cb5300bSChris Mason * This is used by the defragging code to find new and small 8914cb5300bSChris Mason * extents 8924cb5300bSChris Mason */ 8934cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 8944cb5300bSChris Mason struct inode *inode, u64 newer_than, 8954cb5300bSChris Mason u64 *off, int thresh) 8964cb5300bSChris Mason { 8974cb5300bSChris Mason struct btrfs_path *path; 8984cb5300bSChris Mason struct btrfs_key min_key; 8994cb5300bSChris Mason struct extent_buffer *leaf; 9004cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9014cb5300bSChris Mason int type; 9024cb5300bSChris Mason int ret; 903a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9044cb5300bSChris Mason 9054cb5300bSChris Mason path = btrfs_alloc_path(); 9064cb5300bSChris Mason if (!path) 9074cb5300bSChris Mason return -ENOMEM; 9084cb5300bSChris Mason 909a4689d2bSDavid Sterba min_key.objectid = ino; 9104cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9114cb5300bSChris Mason min_key.offset = *off; 9124cb5300bSChris Mason 9134cb5300bSChris Mason path->keep_locks = 1; 9144cb5300bSChris Mason 9154cb5300bSChris Mason while (1) { 9166174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9174cb5300bSChris Mason if (ret != 0) 9184cb5300bSChris Mason goto none; 919a4689d2bSDavid Sterba if (min_key.objectid != ino) 9204cb5300bSChris Mason goto none; 9214cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9224cb5300bSChris Mason goto none; 9234cb5300bSChris Mason 9244cb5300bSChris Mason leaf = path->nodes[0]; 9254cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9264cb5300bSChris Mason struct btrfs_file_extent_item); 9274cb5300bSChris Mason 9284cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9294cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9304cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9314cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9324cb5300bSChris Mason *off = min_key.offset; 9334cb5300bSChris Mason btrfs_free_path(path); 9344cb5300bSChris Mason return 0; 9354cb5300bSChris Mason } 9364cb5300bSChris Mason 9374cb5300bSChris Mason if (min_key.offset == (u64)-1) 9384cb5300bSChris Mason goto none; 9394cb5300bSChris Mason 9404cb5300bSChris Mason min_key.offset++; 9414cb5300bSChris Mason btrfs_release_path(path); 9424cb5300bSChris Mason } 9434cb5300bSChris Mason none: 9444cb5300bSChris Mason btrfs_free_path(path); 9454cb5300bSChris Mason return -ENOENT; 9464cb5300bSChris Mason } 9474cb5300bSChris Mason 9486c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 94917ce6ef8SLiu Bo { 95017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 951940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9526c282eb4SLi Zefan struct extent_map *em; 9536c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 954940100a4SChris Mason 955940100a4SChris Mason /* 956940100a4SChris Mason * hopefully we have this extent in the tree already, try without 957940100a4SChris Mason * the full extent lock 958940100a4SChris Mason */ 959940100a4SChris Mason read_lock(&em_tree->lock); 960940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 961940100a4SChris Mason read_unlock(&em_tree->lock); 962940100a4SChris Mason 963940100a4SChris Mason if (!em) { 964940100a4SChris Mason /* get the big lock and read metadata off disk */ 965d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 966940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 967d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 968940100a4SChris Mason 9696cf8bfbfSDan Carpenter if (IS_ERR(em)) 9706c282eb4SLi Zefan return NULL; 971940100a4SChris Mason } 972940100a4SChris Mason 9736c282eb4SLi Zefan return em; 9746c282eb4SLi Zefan } 9756c282eb4SLi Zefan 9766c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9776c282eb4SLi Zefan { 9786c282eb4SLi Zefan struct extent_map *next; 9796c282eb4SLi Zefan bool ret = true; 9806c282eb4SLi Zefan 9816c282eb4SLi Zefan /* this is the last extent */ 9826c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 9836c282eb4SLi Zefan return false; 9846c282eb4SLi Zefan 9856c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 9866c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 9876c282eb4SLi Zefan ret = false; 9886c282eb4SLi Zefan 9896c282eb4SLi Zefan free_extent_map(next); 9906c282eb4SLi Zefan return ret; 9916c282eb4SLi Zefan } 9926c282eb4SLi Zefan 9936c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 994a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 995a43a2111SAndrew Mahone int compress) 9966c282eb4SLi Zefan { 9976c282eb4SLi Zefan struct extent_map *em; 9986c282eb4SLi Zefan int ret = 1; 9996c282eb4SLi Zefan bool next_mergeable = true; 10006c282eb4SLi Zefan 10016c282eb4SLi Zefan /* 10026c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10036c282eb4SLi Zefan * defragging it 10046c282eb4SLi Zefan */ 10056c282eb4SLi Zefan if (start < *defrag_end) 10066c282eb4SLi Zefan return 1; 10076c282eb4SLi Zefan 10086c282eb4SLi Zefan *skip = 0; 10096c282eb4SLi Zefan 10106c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10116c282eb4SLi Zefan if (!em) 10126c282eb4SLi Zefan return 0; 10136c282eb4SLi Zefan 1014940100a4SChris Mason /* this will cover holes, and inline extents */ 101517ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1016940100a4SChris Mason ret = 0; 101717ce6ef8SLiu Bo goto out; 101817ce6ef8SLiu Bo } 101917ce6ef8SLiu Bo 10206c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1021940100a4SChris Mason 1022940100a4SChris Mason /* 10236c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10246c282eb4SLi Zefan * real extent, don't bother defragging it 1025940100a4SChris Mason */ 1026a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10276c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1028940100a4SChris Mason ret = 0; 102917ce6ef8SLiu Bo out: 1030940100a4SChris Mason /* 1031940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1032940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1033940100a4SChris Mason * so that the next tiny extent will force a defrag. 1034940100a4SChris Mason * 1035940100a4SChris Mason * The end result of this is that tiny extents before a single big 1036940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1037940100a4SChris Mason */ 1038940100a4SChris Mason if (ret) { 1039940100a4SChris Mason *defrag_end = extent_map_end(em); 1040940100a4SChris Mason } else { 1041940100a4SChris Mason *last_len = 0; 1042940100a4SChris Mason *skip = extent_map_end(em); 1043940100a4SChris Mason *defrag_end = 0; 1044940100a4SChris Mason } 1045940100a4SChris Mason 1046940100a4SChris Mason free_extent_map(em); 1047940100a4SChris Mason return ret; 1048940100a4SChris Mason } 1049940100a4SChris Mason 10504cb5300bSChris Mason /* 10514cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10524cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10534cb5300bSChris Mason * to COW and defrag. 10544cb5300bSChris Mason * 10554cb5300bSChris Mason * It also makes sure the delalloc code has enough 10564cb5300bSChris Mason * dirty data to avoid making new small extents as part 10574cb5300bSChris Mason * of the defrag 10584cb5300bSChris Mason * 10594cb5300bSChris Mason * It's a good idea to start RA on this range 10604cb5300bSChris Mason * before calling this. 10614cb5300bSChris Mason */ 10624cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10634cb5300bSChris Mason struct page **pages, 10644cb5300bSChris Mason unsigned long start_index, 1065c41570c9SJustin Maggard unsigned long num_pages) 1066f46b5a66SChristoph Hellwig { 10674cb5300bSChris Mason unsigned long file_end; 10684cb5300bSChris Mason u64 isize = i_size_read(inode); 1069f46b5a66SChristoph Hellwig u64 page_start; 1070f46b5a66SChristoph Hellwig u64 page_end; 10711f12bd06SLiu Bo u64 page_cnt; 10724cb5300bSChris Mason int ret; 10734cb5300bSChris Mason int i; 10744cb5300bSChris Mason int i_done; 10754cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 10764cb5300bSChris Mason struct extent_state *cached_state = NULL; 1077600a45e1SMiao Xie struct extent_io_tree *tree; 10783b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 10794cb5300bSChris Mason 10804cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 10811f12bd06SLiu Bo if (!isize || start_index > file_end) 10821f12bd06SLiu Bo return 0; 10831f12bd06SLiu Bo 10841f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 10854cb5300bSChris Mason 10864cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 10871f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 10884cb5300bSChris Mason if (ret) 10894cb5300bSChris Mason return ret; 10904cb5300bSChris Mason i_done = 0; 1091600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 10924cb5300bSChris Mason 10934cb5300bSChris Mason /* step one, lock all the pages */ 10941f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 10954cb5300bSChris Mason struct page *page; 1096600a45e1SMiao Xie again: 1097a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 10983b16a4e3SJosef Bacik start_index + i, mask); 10994cb5300bSChris Mason if (!page) 11004cb5300bSChris Mason break; 11014cb5300bSChris Mason 1102600a45e1SMiao Xie page_start = page_offset(page); 1103600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1104600a45e1SMiao Xie while (1) { 1105d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 1106600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1107600a45e1SMiao Xie page_start); 1108d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 1109600a45e1SMiao Xie if (!ordered) 1110600a45e1SMiao Xie break; 1111600a45e1SMiao Xie 1112600a45e1SMiao Xie unlock_page(page); 1113600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1114600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1115600a45e1SMiao Xie lock_page(page); 11161f12bd06SLiu Bo /* 11171f12bd06SLiu Bo * we unlocked the page above, so we need check if 11181f12bd06SLiu Bo * it was released or not. 11191f12bd06SLiu Bo */ 11201f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11211f12bd06SLiu Bo unlock_page(page); 11221f12bd06SLiu Bo page_cache_release(page); 11231f12bd06SLiu Bo goto again; 11241f12bd06SLiu Bo } 1125600a45e1SMiao Xie } 1126600a45e1SMiao Xie 11274cb5300bSChris Mason if (!PageUptodate(page)) { 11284cb5300bSChris Mason btrfs_readpage(NULL, page); 11294cb5300bSChris Mason lock_page(page); 11304cb5300bSChris Mason if (!PageUptodate(page)) { 11314cb5300bSChris Mason unlock_page(page); 11324cb5300bSChris Mason page_cache_release(page); 11334cb5300bSChris Mason ret = -EIO; 11344cb5300bSChris Mason break; 11354cb5300bSChris Mason } 11364cb5300bSChris Mason } 1137600a45e1SMiao Xie 1138600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1139600a45e1SMiao Xie unlock_page(page); 1140600a45e1SMiao Xie page_cache_release(page); 1141600a45e1SMiao Xie goto again; 1142600a45e1SMiao Xie } 1143600a45e1SMiao Xie 11444cb5300bSChris Mason pages[i] = page; 11454cb5300bSChris Mason i_done++; 11464cb5300bSChris Mason } 11474cb5300bSChris Mason if (!i_done || ret) 11484cb5300bSChris Mason goto out; 11494cb5300bSChris Mason 11504cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11514cb5300bSChris Mason goto out; 11524cb5300bSChris Mason 11534cb5300bSChris Mason /* 11544cb5300bSChris Mason * so now we have a nice long stream of locked 11554cb5300bSChris Mason * and up to date pages, lets wait on them 11564cb5300bSChris Mason */ 11574cb5300bSChris Mason for (i = 0; i < i_done; i++) 11584cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11594cb5300bSChris Mason 11604cb5300bSChris Mason page_start = page_offset(pages[0]); 11614cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11624cb5300bSChris Mason 11634cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1164d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11654cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11664cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11679e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11689e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11694cb5300bSChris Mason 11701f12bd06SLiu Bo if (i_done != page_cnt) { 11719e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11729e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11739e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 11744cb5300bSChris Mason btrfs_delalloc_release_space(inode, 11751f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 11764cb5300bSChris Mason } 11774cb5300bSChris Mason 11784cb5300bSChris Mason 11799e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 11809e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11814cb5300bSChris Mason 11824cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 11834cb5300bSChris Mason page_start, page_end - 1, &cached_state, 11844cb5300bSChris Mason GFP_NOFS); 11854cb5300bSChris Mason 11864cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11874cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 11884cb5300bSChris Mason ClearPageChecked(pages[i]); 11894cb5300bSChris Mason set_page_extent_mapped(pages[i]); 11904cb5300bSChris Mason set_page_dirty(pages[i]); 11914cb5300bSChris Mason unlock_page(pages[i]); 11924cb5300bSChris Mason page_cache_release(pages[i]); 11934cb5300bSChris Mason } 11944cb5300bSChris Mason return i_done; 11954cb5300bSChris Mason out: 11964cb5300bSChris Mason for (i = 0; i < i_done; i++) { 11974cb5300bSChris Mason unlock_page(pages[i]); 11984cb5300bSChris Mason page_cache_release(pages[i]); 11994cb5300bSChris Mason } 12001f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12014cb5300bSChris Mason return ret; 12024cb5300bSChris Mason 12034cb5300bSChris Mason } 12044cb5300bSChris Mason 12054cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12064cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12074cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12084cb5300bSChris Mason { 12094cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12104cb5300bSChris Mason struct file_ra_state *ra = NULL; 12114cb5300bSChris Mason unsigned long last_index; 1212151a31b2SLi Zefan u64 isize = i_size_read(inode); 1213940100a4SChris Mason u64 last_len = 0; 1214940100a4SChris Mason u64 skip = 0; 1215940100a4SChris Mason u64 defrag_end = 0; 12164cb5300bSChris Mason u64 newer_off = range->start; 1217f46b5a66SChristoph Hellwig unsigned long i; 1218008873eaSLi Zefan unsigned long ra_index = 0; 1219f46b5a66SChristoph Hellwig int ret; 12204cb5300bSChris Mason int defrag_count = 0; 12211a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 12224cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1223c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1224c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12254cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12264cb5300bSChris Mason struct page **pages = NULL; 12274cb5300bSChris Mason 12280abd5b17SLiu Bo if (isize == 0) 12290abd5b17SLiu Bo return 0; 12300abd5b17SLiu Bo 12310abd5b17SLiu Bo if (range->start >= isize) 12320abd5b17SLiu Bo return -EINVAL; 12331a419d85SLi Zefan 12341a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12351a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12361a419d85SLi Zefan return -EINVAL; 12371a419d85SLi Zefan if (range->compress_type) 12381a419d85SLi Zefan compress_type = range->compress_type; 12391a419d85SLi Zefan } 1240f46b5a66SChristoph Hellwig 12410abd5b17SLiu Bo if (extent_thresh == 0) 12420abd5b17SLiu Bo extent_thresh = 256 * 1024; 1243f46b5a66SChristoph Hellwig 12444cb5300bSChris Mason /* 12454cb5300bSChris Mason * if we were not given a file, allocate a readahead 12464cb5300bSChris Mason * context 12474cb5300bSChris Mason */ 12484cb5300bSChris Mason if (!file) { 12494cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12504cb5300bSChris Mason if (!ra) 12514cb5300bSChris Mason return -ENOMEM; 12524cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12534cb5300bSChris Mason } else { 12544cb5300bSChris Mason ra = &file->f_ra; 12554cb5300bSChris Mason } 12564cb5300bSChris Mason 1257d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12584cb5300bSChris Mason GFP_NOFS); 12594cb5300bSChris Mason if (!pages) { 12604cb5300bSChris Mason ret = -ENOMEM; 12614cb5300bSChris Mason goto out_ra; 12624cb5300bSChris Mason } 12634cb5300bSChris Mason 12644cb5300bSChris Mason /* find the last page to defrag */ 12651e701a32SChris Mason if (range->start + range->len > range->start) { 1266151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12671e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12681e701a32SChris Mason } else { 1269151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12701e701a32SChris Mason } 12711e701a32SChris Mason 12724cb5300bSChris Mason if (newer_than) { 12734cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 12744cb5300bSChris Mason &newer_off, 64 * 1024); 12754cb5300bSChris Mason if (!ret) { 12764cb5300bSChris Mason range->start = newer_off; 12774cb5300bSChris Mason /* 12784cb5300bSChris Mason * we always align our defrag to help keep 12794cb5300bSChris Mason * the extents in the file evenly spaced 12804cb5300bSChris Mason */ 12814cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12824cb5300bSChris Mason } else 12834cb5300bSChris Mason goto out_ra; 12844cb5300bSChris Mason } else { 12851e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 12864cb5300bSChris Mason } 12874cb5300bSChris Mason if (!max_to_defrag) 12887ec31b54SLiu Bo max_to_defrag = last_index + 1; 12894cb5300bSChris Mason 12902a0f7f57SLi Zefan /* 12912a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 12922a0f7f57SLi Zefan * written sequentially. 12932a0f7f57SLi Zefan */ 12942a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 12952a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 12962a0f7f57SLi Zefan 1297f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1298f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1299f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 13004cb5300bSChris Mason /* 13014cb5300bSChris Mason * make sure we stop running if someone unmounts 13024cb5300bSChris Mason * the FS 13034cb5300bSChris Mason */ 13044cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13054cb5300bSChris Mason break; 13064cb5300bSChris Mason 1307210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1308efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1309210549ebSDavid Sterba ret = -EAGAIN; 1310210549ebSDavid Sterba break; 1311210549ebSDavid Sterba } 1312210549ebSDavid Sterba 131366c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13146c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1315a43a2111SAndrew Mahone &defrag_end, range->flags & 1316a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1317940100a4SChris Mason unsigned long next; 1318940100a4SChris Mason /* 1319940100a4SChris Mason * the should_defrag function tells us how much to skip 1320940100a4SChris Mason * bump our counter by the suggested amount 1321940100a4SChris Mason */ 1322940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1323940100a4SChris Mason i = max(i + 1, next); 1324940100a4SChris Mason continue; 1325940100a4SChris Mason } 1326008873eaSLi Zefan 1327008873eaSLi Zefan if (!newer_than) { 1328008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1329008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1330008873eaSLi Zefan cluster = min(cluster, max_cluster); 1331008873eaSLi Zefan } else { 1332008873eaSLi Zefan cluster = max_cluster; 1333008873eaSLi Zefan } 1334008873eaSLi Zefan 1335008873eaSLi Zefan if (i + cluster > ra_index) { 1336008873eaSLi Zefan ra_index = max(i, ra_index); 1337008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1338008873eaSLi Zefan cluster); 1339008873eaSLi Zefan ra_index += max_cluster; 1340008873eaSLi Zefan } 13414cb5300bSChris Mason 1342ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1343633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1344633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1345008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1346ecb8bea8SLiu Bo if (ret < 0) { 1347ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13484cb5300bSChris Mason goto out_ra; 1349ecb8bea8SLiu Bo } 13504cb5300bSChris Mason 13514cb5300bSChris Mason defrag_count += ret; 1352d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1353ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13544cb5300bSChris Mason 13554cb5300bSChris Mason if (newer_than) { 13564cb5300bSChris Mason if (newer_off == (u64)-1) 13574cb5300bSChris Mason break; 13584cb5300bSChris Mason 1359e1f041e1SLiu Bo if (ret > 0) 1360e1f041e1SLiu Bo i += ret; 1361e1f041e1SLiu Bo 13624cb5300bSChris Mason newer_off = max(newer_off + 1, 13634cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13644cb5300bSChris Mason 13654cb5300bSChris Mason ret = find_new_extents(root, inode, 13664cb5300bSChris Mason newer_than, &newer_off, 13674cb5300bSChris Mason 64 * 1024); 13684cb5300bSChris Mason if (!ret) { 13694cb5300bSChris Mason range->start = newer_off; 13704cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13714cb5300bSChris Mason } else { 13724cb5300bSChris Mason break; 1373940100a4SChris Mason } 13744cb5300bSChris Mason } else { 1375008873eaSLi Zefan if (ret > 0) { 1376cbcc8326SLi Zefan i += ret; 1377008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1378008873eaSLi Zefan } else { 1379940100a4SChris Mason i++; 1380008873eaSLi Zefan last_len = 0; 1381008873eaSLi Zefan } 1382f46b5a66SChristoph Hellwig } 13834cb5300bSChris Mason } 1384f46b5a66SChristoph Hellwig 13851e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 13861e701a32SChris Mason filemap_flush(inode->i_mapping); 13871e701a32SChris Mason 13881e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 13891e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 13901e701a32SChris Mason * we have to make sure the IO is actually started and that 13911e701a32SChris Mason * ordered extents get created before we return 13921e701a32SChris Mason */ 13931e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 13941e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 13951e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 13961e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 13971e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 13981e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 13991e701a32SChris Mason } 14001e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14011e701a32SChris Mason } 14021e701a32SChris Mason 14031a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14042b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14051a419d85SLi Zefan } 14061a419d85SLi Zefan 140760ccf82fSDiego Calleja ret = defrag_count; 1408940100a4SChris Mason 14094cb5300bSChris Mason out_ra: 1410633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1411633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1412633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1413633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1414633085c7SFilipe David Borba Manana } 14154cb5300bSChris Mason if (!file) 14164cb5300bSChris Mason kfree(ra); 14174cb5300bSChris Mason kfree(pages); 1418940100a4SChris Mason return ret; 1419f46b5a66SChristoph Hellwig } 1420f46b5a66SChristoph Hellwig 1421198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 142276dda93cSYan, Zheng void __user *arg) 1423f46b5a66SChristoph Hellwig { 1424f46b5a66SChristoph Hellwig u64 new_size; 1425f46b5a66SChristoph Hellwig u64 old_size; 1426f46b5a66SChristoph Hellwig u64 devid = 1; 1427496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1428f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1429f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1430f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1431f46b5a66SChristoph Hellwig char *sizestr; 1432f46b5a66SChristoph Hellwig char *devstr = NULL; 1433f46b5a66SChristoph Hellwig int ret = 0; 1434f46b5a66SChristoph Hellwig int mod = 0; 1435f46b5a66SChristoph Hellwig 1436e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1437e441d54dSChris Mason return -EPERM; 1438e441d54dSChris Mason 1439198605a8SMiao Xie ret = mnt_want_write_file(file); 1440198605a8SMiao Xie if (ret) 1441198605a8SMiao Xie return ret; 1442198605a8SMiao Xie 14435ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14445ac00addSStefan Behrens 1)) { 144597547676SMiao Xie mnt_drop_write_file(file); 1446e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1447c9e9f97bSIlya Dryomov } 1448c9e9f97bSIlya Dryomov 14495ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1450dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1451c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1452c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1453c9e9f97bSIlya Dryomov goto out; 1454c9e9f97bSIlya Dryomov } 14555516e595SMark Fasheh 14565516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1457f46b5a66SChristoph Hellwig 1458f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1459f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1460f46b5a66SChristoph Hellwig if (devstr) { 1461f46b5a66SChristoph Hellwig char *end; 1462f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1463f46b5a66SChristoph Hellwig *devstr = '\0'; 1464f46b5a66SChristoph Hellwig devstr = vol_args->name; 1465f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1466dfd79829SMiao Xie if (!devid) { 1467dfd79829SMiao Xie ret = -EINVAL; 1468dfd79829SMiao Xie goto out_free; 1469dfd79829SMiao Xie } 1470efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1471f46b5a66SChristoph Hellwig } 1472dba60f3fSMiao Xie 1473aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1474f46b5a66SChristoph Hellwig if (!device) { 1475efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1476c1c9ff7cSGeert Uytterhoeven devid); 1477dfd79829SMiao Xie ret = -ENODEV; 1478c9e9f97bSIlya Dryomov goto out_free; 1479f46b5a66SChristoph Hellwig } 1480dba60f3fSMiao Xie 1481dba60f3fSMiao Xie if (!device->writeable) { 1482efe120a0SFrank Holton btrfs_info(root->fs_info, 1483efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1484c1c9ff7cSGeert Uytterhoeven devid); 1485dfd79829SMiao Xie ret = -EPERM; 14864e42ae1bSLiu Bo goto out_free; 14874e42ae1bSLiu Bo } 14884e42ae1bSLiu Bo 1489f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1490f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1491f46b5a66SChristoph Hellwig else { 1492f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1493f46b5a66SChristoph Hellwig mod = -1; 1494f46b5a66SChristoph Hellwig sizestr++; 1495f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1496f46b5a66SChristoph Hellwig mod = 1; 1497f46b5a66SChristoph Hellwig sizestr++; 1498f46b5a66SChristoph Hellwig } 149991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1500f46b5a66SChristoph Hellwig if (new_size == 0) { 1501f46b5a66SChristoph Hellwig ret = -EINVAL; 1502c9e9f97bSIlya Dryomov goto out_free; 1503f46b5a66SChristoph Hellwig } 1504f46b5a66SChristoph Hellwig } 1505f46b5a66SChristoph Hellwig 150663a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1507dfd79829SMiao Xie ret = -EPERM; 150863a212abSStefan Behrens goto out_free; 150963a212abSStefan Behrens } 151063a212abSStefan Behrens 1511f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1512f46b5a66SChristoph Hellwig 1513f46b5a66SChristoph Hellwig if (mod < 0) { 1514f46b5a66SChristoph Hellwig if (new_size > old_size) { 1515f46b5a66SChristoph Hellwig ret = -EINVAL; 1516c9e9f97bSIlya Dryomov goto out_free; 1517f46b5a66SChristoph Hellwig } 1518f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1519f46b5a66SChristoph Hellwig } else if (mod > 0) { 1520eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1521eb8052e0SWenliang Fan ret = -EINVAL; 1522eb8052e0SWenliang Fan goto out_free; 1523eb8052e0SWenliang Fan } 1524f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1525f46b5a66SChristoph Hellwig } 1526f46b5a66SChristoph Hellwig 1527f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1528f46b5a66SChristoph Hellwig ret = -EINVAL; 1529c9e9f97bSIlya Dryomov goto out_free; 1530f46b5a66SChristoph Hellwig } 1531f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1532f46b5a66SChristoph Hellwig ret = -EFBIG; 1533c9e9f97bSIlya Dryomov goto out_free; 1534f46b5a66SChristoph Hellwig } 1535f46b5a66SChristoph Hellwig 1536f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1537f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1538f46b5a66SChristoph Hellwig 1539efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1540c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1541f46b5a66SChristoph Hellwig 1542f46b5a66SChristoph Hellwig if (new_size > old_size) { 1543a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 154498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 154598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1546c9e9f97bSIlya Dryomov goto out_free; 154798d5dc13STsutomu Itoh } 1548f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1549f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1550ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1551f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15520253f40eSjeff.liu } /* equal, nothing need to do */ 1553f46b5a66SChristoph Hellwig 1554c9e9f97bSIlya Dryomov out_free: 1555f46b5a66SChristoph Hellwig kfree(vol_args); 1556c9e9f97bSIlya Dryomov out: 1557c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15585ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 155918f39c41SIlya Dryomov mnt_drop_write_file(file); 1560f46b5a66SChristoph Hellwig return ret; 1561f46b5a66SChristoph Hellwig } 1562f46b5a66SChristoph Hellwig 156372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15646f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15656f72c7e2SArne Jansen u64 *transid, bool readonly, 15668696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1567f46b5a66SChristoph Hellwig { 1568f46b5a66SChristoph Hellwig int namelen; 15693de4586cSChris Mason int ret = 0; 1570f46b5a66SChristoph Hellwig 1571a874a63eSLiu Bo ret = mnt_want_write_file(file); 1572a874a63eSLiu Bo if (ret) 1573a874a63eSLiu Bo goto out; 1574a874a63eSLiu Bo 157572fd032eSSage Weil namelen = strlen(name); 157672fd032eSSage Weil if (strchr(name, '/')) { 1577f46b5a66SChristoph Hellwig ret = -EINVAL; 1578a874a63eSLiu Bo goto out_drop_write; 1579f46b5a66SChristoph Hellwig } 1580f46b5a66SChristoph Hellwig 158116780cabSChris Mason if (name[0] == '.' && 158216780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 158316780cabSChris Mason ret = -EEXIST; 1584a874a63eSLiu Bo goto out_drop_write; 158516780cabSChris Mason } 158616780cabSChris Mason 15873de4586cSChris Mason if (subvol) { 158872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 15896f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1590cb8e7090SChristoph Hellwig } else { 15912903ff01SAl Viro struct fd src = fdget(fd); 15923de4586cSChris Mason struct inode *src_inode; 15932903ff01SAl Viro if (!src.file) { 15943de4586cSChris Mason ret = -EINVAL; 1595a874a63eSLiu Bo goto out_drop_write; 15963de4586cSChris Mason } 15973de4586cSChris Mason 1598496ad9aaSAl Viro src_inode = file_inode(src.file); 1599496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1600efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1601efe120a0SFrank Holton "Snapshot src from another FS"); 160223ad5b17SKusanagi Kouichi ret = -EXDEV; 1603d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1604d0242061SDavid Sterba /* 1605d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1606d0242061SDavid Sterba * are limited to own subvolumes only 1607d0242061SDavid Sterba */ 1608d0242061SDavid Sterba ret = -EPERM; 1609ecd18815SAl Viro } else { 161072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 161172fd032eSSage Weil BTRFS_I(src_inode)->root, 16126f72c7e2SArne Jansen transid, readonly, inherit); 1613ecd18815SAl Viro } 16142903ff01SAl Viro fdput(src); 1615cb8e7090SChristoph Hellwig } 1616a874a63eSLiu Bo out_drop_write: 1617a874a63eSLiu Bo mnt_drop_write_file(file); 1618f46b5a66SChristoph Hellwig out: 161972fd032eSSage Weil return ret; 162072fd032eSSage Weil } 162172fd032eSSage Weil 162272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1623fa0d2b9bSLi Zefan void __user *arg, int subvol) 162472fd032eSSage Weil { 1625fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 162672fd032eSSage Weil int ret; 162772fd032eSSage Weil 1628fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1629fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1630fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1631fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1632fa0d2b9bSLi Zefan 1633fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1634b83cc969SLi Zefan vol_args->fd, subvol, 16356f72c7e2SArne Jansen NULL, false, NULL); 1636fa0d2b9bSLi Zefan 1637fa0d2b9bSLi Zefan kfree(vol_args); 1638fa0d2b9bSLi Zefan return ret; 1639fa0d2b9bSLi Zefan } 1640fa0d2b9bSLi Zefan 1641fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1642fa0d2b9bSLi Zefan void __user *arg, int subvol) 1643fa0d2b9bSLi Zefan { 1644fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1645fa0d2b9bSLi Zefan int ret; 1646fdfb1e4fSLi Zefan u64 transid = 0; 1647fdfb1e4fSLi Zefan u64 *ptr = NULL; 1648b83cc969SLi Zefan bool readonly = false; 16496f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 165072fd032eSSage Weil 1651fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1652fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1653fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1654fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1655fdfb1e4fSLi Zefan 1656b83cc969SLi Zefan if (vol_args->flags & 16576f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 16586f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1659b83cc969SLi Zefan ret = -EOPNOTSUPP; 1660fdfb1e4fSLi Zefan goto out; 1661fdfb1e4fSLi Zefan } 1662fdfb1e4fSLi Zefan 1663fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1664fdfb1e4fSLi Zefan ptr = &transid; 1665b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1666b83cc969SLi Zefan readonly = true; 16676f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16686f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 16696f72c7e2SArne Jansen ret = -EINVAL; 16706f72c7e2SArne Jansen goto out; 16716f72c7e2SArne Jansen } 16726f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 16736f72c7e2SArne Jansen if (IS_ERR(inherit)) { 16746f72c7e2SArne Jansen ret = PTR_ERR(inherit); 16756f72c7e2SArne Jansen goto out; 16766f72c7e2SArne Jansen } 16776f72c7e2SArne Jansen } 167875eaa0e2SSage Weil 1679fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 16806f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 16818696c533SMiao Xie readonly, inherit); 168275eaa0e2SSage Weil 1683fdfb1e4fSLi Zefan if (ret == 0 && ptr && 168475eaa0e2SSage Weil copy_to_user(arg + 1685fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1686fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 168775eaa0e2SSage Weil ret = -EFAULT; 1688fdfb1e4fSLi Zefan out: 1689f46b5a66SChristoph Hellwig kfree(vol_args); 16906f72c7e2SArne Jansen kfree(inherit); 1691f46b5a66SChristoph Hellwig return ret; 1692f46b5a66SChristoph Hellwig } 1693f46b5a66SChristoph Hellwig 16940caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 16950caa102dSLi Zefan void __user *arg) 16960caa102dSLi Zefan { 1697496ad9aaSAl Viro struct inode *inode = file_inode(file); 16980caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 16990caa102dSLi Zefan int ret = 0; 17000caa102dSLi Zefan u64 flags = 0; 17010caa102dSLi Zefan 170233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17030caa102dSLi Zefan return -EINVAL; 17040caa102dSLi Zefan 17050caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17060caa102dSLi Zefan if (btrfs_root_readonly(root)) 17070caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17080caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17090caa102dSLi Zefan 17100caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17110caa102dSLi Zefan ret = -EFAULT; 17120caa102dSLi Zefan 17130caa102dSLi Zefan return ret; 17140caa102dSLi Zefan } 17150caa102dSLi Zefan 17160caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17170caa102dSLi Zefan void __user *arg) 17180caa102dSLi Zefan { 1719496ad9aaSAl Viro struct inode *inode = file_inode(file); 17200caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17210caa102dSLi Zefan struct btrfs_trans_handle *trans; 17220caa102dSLi Zefan u64 root_flags; 17230caa102dSLi Zefan u64 flags; 17240caa102dSLi Zefan int ret = 0; 17250caa102dSLi Zefan 1726bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1727bd60ea0fSDavid Sterba return -EPERM; 1728bd60ea0fSDavid Sterba 1729b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1730b9ca0664SLiu Bo if (ret) 1731b9ca0664SLiu Bo goto out; 17320caa102dSLi Zefan 1733b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1734b9ca0664SLiu Bo ret = -EINVAL; 1735b9ca0664SLiu Bo goto out_drop_write; 1736b9ca0664SLiu Bo } 17370caa102dSLi Zefan 1738b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1739b9ca0664SLiu Bo ret = -EFAULT; 1740b9ca0664SLiu Bo goto out_drop_write; 1741b9ca0664SLiu Bo } 17420caa102dSLi Zefan 1743b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1744b9ca0664SLiu Bo ret = -EINVAL; 1745b9ca0664SLiu Bo goto out_drop_write; 1746b9ca0664SLiu Bo } 17470caa102dSLi Zefan 1748b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1749b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1750b9ca0664SLiu Bo goto out_drop_write; 1751b9ca0664SLiu Bo } 17520caa102dSLi Zefan 17530caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17540caa102dSLi Zefan 17550caa102dSLi Zefan /* nothing to do */ 17560caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1757b9ca0664SLiu Bo goto out_drop_sem; 17580caa102dSLi Zefan 17590caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17602c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 17610caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17620caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17632c686537SDavid Sterba } else { 17642c686537SDavid Sterba /* 17652c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 17662c686537SDavid Sterba * send 17672c686537SDavid Sterba */ 17682c686537SDavid Sterba spin_lock(&root->root_item_lock); 17692c686537SDavid Sterba if (root->send_in_progress == 0) { 17700caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17710caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 17722c686537SDavid Sterba spin_unlock(&root->root_item_lock); 17732c686537SDavid Sterba } else { 17742c686537SDavid Sterba spin_unlock(&root->root_item_lock); 17752c686537SDavid Sterba btrfs_warn(root->fs_info, 17762c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 17772c686537SDavid Sterba root->root_key.objectid); 17782c686537SDavid Sterba ret = -EPERM; 17792c686537SDavid Sterba goto out_drop_sem; 17802c686537SDavid Sterba } 17812c686537SDavid Sterba } 17820caa102dSLi Zefan 17830caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 17840caa102dSLi Zefan if (IS_ERR(trans)) { 17850caa102dSLi Zefan ret = PTR_ERR(trans); 17860caa102dSLi Zefan goto out_reset; 17870caa102dSLi Zefan } 17880caa102dSLi Zefan 1789b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 17900caa102dSLi Zefan &root->root_key, &root->root_item); 17910caa102dSLi Zefan 17920caa102dSLi Zefan btrfs_commit_transaction(trans, root); 17930caa102dSLi Zefan out_reset: 17940caa102dSLi Zefan if (ret) 17950caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1796b9ca0664SLiu Bo out_drop_sem: 17970caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1798b9ca0664SLiu Bo out_drop_write: 1799b9ca0664SLiu Bo mnt_drop_write_file(file); 1800b9ca0664SLiu Bo out: 18010caa102dSLi Zefan return ret; 18020caa102dSLi Zefan } 18030caa102dSLi Zefan 180476dda93cSYan, Zheng /* 180576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 180676dda93cSYan, Zheng */ 180776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 180876dda93cSYan, Zheng { 180976dda93cSYan, Zheng struct btrfs_path *path; 1810175a2b87SJosef Bacik struct btrfs_dir_item *di; 181176dda93cSYan, Zheng struct btrfs_key key; 1812175a2b87SJosef Bacik u64 dir_id; 181376dda93cSYan, Zheng int ret; 181476dda93cSYan, Zheng 181576dda93cSYan, Zheng path = btrfs_alloc_path(); 181676dda93cSYan, Zheng if (!path) 181776dda93cSYan, Zheng return -ENOMEM; 181876dda93cSYan, Zheng 1819175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1820175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1821175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1822175a2b87SJosef Bacik dir_id, "default", 7, 0); 1823175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1824175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1825175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 1826175a2b87SJosef Bacik ret = -ENOTEMPTY; 1827175a2b87SJosef Bacik goto out; 1828175a2b87SJosef Bacik } 1829175a2b87SJosef Bacik btrfs_release_path(path); 1830175a2b87SJosef Bacik } 1831175a2b87SJosef Bacik 183276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 183376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 183476dda93cSYan, Zheng key.offset = (u64)-1; 183576dda93cSYan, Zheng 183676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 183776dda93cSYan, Zheng &key, path, 0, 0); 183876dda93cSYan, Zheng if (ret < 0) 183976dda93cSYan, Zheng goto out; 184076dda93cSYan, Zheng BUG_ON(ret == 0); 184176dda93cSYan, Zheng 184276dda93cSYan, Zheng ret = 0; 184376dda93cSYan, Zheng if (path->slots[0] > 0) { 184476dda93cSYan, Zheng path->slots[0]--; 184576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 184676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 184776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 184876dda93cSYan, Zheng ret = -ENOTEMPTY; 184976dda93cSYan, Zheng } 185076dda93cSYan, Zheng out: 185176dda93cSYan, Zheng btrfs_free_path(path); 185276dda93cSYan, Zheng return ret; 185376dda93cSYan, Zheng } 185476dda93cSYan, Zheng 1855ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1856ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1857ac8e9819SChris Mason { 1858abc6e134SChris Mason struct btrfs_key test; 1859abc6e134SChris Mason int ret; 1860abc6e134SChris Mason 1861abc6e134SChris Mason test.objectid = sk->min_objectid; 1862abc6e134SChris Mason test.type = sk->min_type; 1863abc6e134SChris Mason test.offset = sk->min_offset; 1864abc6e134SChris Mason 1865abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1866abc6e134SChris Mason if (ret < 0) 1867ac8e9819SChris Mason return 0; 1868abc6e134SChris Mason 1869abc6e134SChris Mason test.objectid = sk->max_objectid; 1870abc6e134SChris Mason test.type = sk->max_type; 1871abc6e134SChris Mason test.offset = sk->max_offset; 1872abc6e134SChris Mason 1873abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1874abc6e134SChris Mason if (ret > 0) 1875ac8e9819SChris Mason return 0; 1876ac8e9819SChris Mason return 1; 1877ac8e9819SChris Mason } 1878ac8e9819SChris Mason 1879ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1880ac8e9819SChris Mason struct btrfs_path *path, 1881ac8e9819SChris Mason struct btrfs_key *key, 1882ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1883ac8e9819SChris Mason char *buf, 1884ac8e9819SChris Mason unsigned long *sk_offset, 1885ac8e9819SChris Mason int *num_found) 1886ac8e9819SChris Mason { 1887ac8e9819SChris Mason u64 found_transid; 1888ac8e9819SChris Mason struct extent_buffer *leaf; 1889ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1890ac8e9819SChris Mason unsigned long item_off; 1891ac8e9819SChris Mason unsigned long item_len; 1892ac8e9819SChris Mason int nritems; 1893ac8e9819SChris Mason int i; 1894ac8e9819SChris Mason int slot; 1895ac8e9819SChris Mason int ret = 0; 1896ac8e9819SChris Mason 1897ac8e9819SChris Mason leaf = path->nodes[0]; 1898ac8e9819SChris Mason slot = path->slots[0]; 1899ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1900ac8e9819SChris Mason 1901ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1902ac8e9819SChris Mason i = nritems; 1903ac8e9819SChris Mason goto advance_key; 1904ac8e9819SChris Mason } 1905ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1906ac8e9819SChris Mason 1907ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1908ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1909ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1910ac8e9819SChris Mason 191103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 191203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 191303b71c6cSGabriel de Perthuis continue; 191403b71c6cSGabriel de Perthuis 191503b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1916ac8e9819SChris Mason item_len = 0; 1917ac8e9819SChris Mason 1918ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1919ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1920ac8e9819SChris Mason ret = 1; 1921ac8e9819SChris Mason goto overflow; 1922ac8e9819SChris Mason } 1923ac8e9819SChris Mason 1924ac8e9819SChris Mason sh.objectid = key->objectid; 1925ac8e9819SChris Mason sh.offset = key->offset; 1926ac8e9819SChris Mason sh.type = key->type; 1927ac8e9819SChris Mason sh.len = item_len; 1928ac8e9819SChris Mason sh.transid = found_transid; 1929ac8e9819SChris Mason 1930ac8e9819SChris Mason /* copy search result header */ 1931ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1932ac8e9819SChris Mason *sk_offset += sizeof(sh); 1933ac8e9819SChris Mason 1934ac8e9819SChris Mason if (item_len) { 1935ac8e9819SChris Mason char *p = buf + *sk_offset; 1936ac8e9819SChris Mason /* copy the item */ 1937ac8e9819SChris Mason read_extent_buffer(leaf, p, 1938ac8e9819SChris Mason item_off, item_len); 1939ac8e9819SChris Mason *sk_offset += item_len; 1940ac8e9819SChris Mason } 1941e2156867SHugo Mills (*num_found)++; 1942ac8e9819SChris Mason 1943ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1944ac8e9819SChris Mason break; 1945ac8e9819SChris Mason } 1946ac8e9819SChris Mason advance_key: 1947ac8e9819SChris Mason ret = 0; 1948abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1949abc6e134SChris Mason key->offset++; 1950abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1951abc6e134SChris Mason key->offset = 0; 1952abc6e134SChris Mason key->type++; 1953abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1954abc6e134SChris Mason key->offset = 0; 1955abc6e134SChris Mason key->type = 0; 1956abc6e134SChris Mason key->objectid++; 1957abc6e134SChris Mason } else 1958abc6e134SChris Mason ret = 1; 1959ac8e9819SChris Mason overflow: 1960ac8e9819SChris Mason return ret; 1961ac8e9819SChris Mason } 1962ac8e9819SChris Mason 1963ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1964ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1965ac8e9819SChris Mason { 1966ac8e9819SChris Mason struct btrfs_root *root; 1967ac8e9819SChris Mason struct btrfs_key key; 1968ac8e9819SChris Mason struct btrfs_path *path; 1969ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1970ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1971ac8e9819SChris Mason int ret; 1972ac8e9819SChris Mason int num_found = 0; 1973ac8e9819SChris Mason unsigned long sk_offset = 0; 1974ac8e9819SChris Mason 1975ac8e9819SChris Mason path = btrfs_alloc_path(); 1976ac8e9819SChris Mason if (!path) 1977ac8e9819SChris Mason return -ENOMEM; 1978ac8e9819SChris Mason 1979ac8e9819SChris Mason if (sk->tree_id == 0) { 1980ac8e9819SChris Mason /* search the root of the inode that was passed */ 1981ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1982ac8e9819SChris Mason } else { 1983ac8e9819SChris Mason key.objectid = sk->tree_id; 1984ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1985ac8e9819SChris Mason key.offset = (u64)-1; 1986ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1987ac8e9819SChris Mason if (IS_ERR(root)) { 1988efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 1989ac8e9819SChris Mason sk->tree_id); 1990ac8e9819SChris Mason btrfs_free_path(path); 1991ac8e9819SChris Mason return -ENOENT; 1992ac8e9819SChris Mason } 1993ac8e9819SChris Mason } 1994ac8e9819SChris Mason 1995ac8e9819SChris Mason key.objectid = sk->min_objectid; 1996ac8e9819SChris Mason key.type = sk->min_type; 1997ac8e9819SChris Mason key.offset = sk->min_offset; 1998ac8e9819SChris Mason 1999ac8e9819SChris Mason path->keep_locks = 1; 2000ac8e9819SChris Mason 2001ac8e9819SChris Mason while (1) { 20026174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2003ac8e9819SChris Mason if (ret != 0) { 2004ac8e9819SChris Mason if (ret > 0) 2005ac8e9819SChris Mason ret = 0; 2006ac8e9819SChris Mason goto err; 2007ac8e9819SChris Mason } 2008ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 2009ac8e9819SChris Mason &sk_offset, &num_found); 2010b3b4aa74SDavid Sterba btrfs_release_path(path); 2011ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 2012ac8e9819SChris Mason break; 2013ac8e9819SChris Mason 2014ac8e9819SChris Mason } 2015ac8e9819SChris Mason ret = 0; 2016ac8e9819SChris Mason err: 2017ac8e9819SChris Mason sk->nr_items = num_found; 2018ac8e9819SChris Mason btrfs_free_path(path); 2019ac8e9819SChris Mason return ret; 2020ac8e9819SChris Mason } 2021ac8e9819SChris Mason 2022ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2023ac8e9819SChris Mason void __user *argp) 2024ac8e9819SChris Mason { 2025ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 2026ac8e9819SChris Mason struct inode *inode; 2027ac8e9819SChris Mason int ret; 2028ac8e9819SChris Mason 2029ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2030ac8e9819SChris Mason return -EPERM; 2031ac8e9819SChris Mason 20322354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20332354d08fSJulia Lawall if (IS_ERR(args)) 20342354d08fSJulia Lawall return PTR_ERR(args); 2035ac8e9819SChris Mason 2036496ad9aaSAl Viro inode = file_inode(file); 2037ac8e9819SChris Mason ret = search_ioctl(inode, args); 2038ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2039ac8e9819SChris Mason ret = -EFAULT; 2040ac8e9819SChris Mason kfree(args); 2041ac8e9819SChris Mason return ret; 2042ac8e9819SChris Mason } 2043ac8e9819SChris Mason 204498d377a0STARUISI Hiroaki /* 2045ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2046ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 204798d377a0STARUISI Hiroaki */ 204898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 204998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 205098d377a0STARUISI Hiroaki { 205198d377a0STARUISI Hiroaki struct btrfs_root *root; 205298d377a0STARUISI Hiroaki struct btrfs_key key; 2053ac8e9819SChris Mason char *ptr; 205498d377a0STARUISI Hiroaki int ret = -1; 205598d377a0STARUISI Hiroaki int slot; 205698d377a0STARUISI Hiroaki int len; 205798d377a0STARUISI Hiroaki int total_len = 0; 205898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 205998d377a0STARUISI Hiroaki struct extent_buffer *l; 206098d377a0STARUISI Hiroaki struct btrfs_path *path; 206198d377a0STARUISI Hiroaki 206298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 206398d377a0STARUISI Hiroaki name[0]='\0'; 206498d377a0STARUISI Hiroaki return 0; 206598d377a0STARUISI Hiroaki } 206698d377a0STARUISI Hiroaki 206798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 206898d377a0STARUISI Hiroaki if (!path) 206998d377a0STARUISI Hiroaki return -ENOMEM; 207098d377a0STARUISI Hiroaki 2071ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 207298d377a0STARUISI Hiroaki 207398d377a0STARUISI Hiroaki key.objectid = tree_id; 207498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 207598d377a0STARUISI Hiroaki key.offset = (u64)-1; 207698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 207798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2078efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 20798ad6fcabSChris Mason ret = -ENOENT; 20808ad6fcabSChris Mason goto out; 208198d377a0STARUISI Hiroaki } 208298d377a0STARUISI Hiroaki 208398d377a0STARUISI Hiroaki key.objectid = dirid; 208498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 20858ad6fcabSChris Mason key.offset = (u64)-1; 208698d377a0STARUISI Hiroaki 208798d377a0STARUISI Hiroaki while (1) { 208898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 208998d377a0STARUISI Hiroaki if (ret < 0) 209098d377a0STARUISI Hiroaki goto out; 209118674c6cSFilipe David Borba Manana else if (ret > 0) { 209218674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 209318674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 209418674c6cSFilipe David Borba Manana if (ret < 0) 209518674c6cSFilipe David Borba Manana goto out; 209618674c6cSFilipe David Borba Manana else if (ret > 0) { 2097ac8e9819SChris Mason ret = -ENOENT; 209898d377a0STARUISI Hiroaki goto out; 2099ac8e9819SChris Mason } 210018674c6cSFilipe David Borba Manana } 210118674c6cSFilipe David Borba Manana 210218674c6cSFilipe David Borba Manana l = path->nodes[0]; 210318674c6cSFilipe David Borba Manana slot = path->slots[0]; 210418674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 210598d377a0STARUISI Hiroaki 210698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 210798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 210898d377a0STARUISI Hiroaki ptr -= len + 1; 210998d377a0STARUISI Hiroaki total_len += len + 1; 2110a696cf35SFilipe David Borba Manana if (ptr < name) { 2111a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 211298d377a0STARUISI Hiroaki goto out; 2113a696cf35SFilipe David Borba Manana } 211498d377a0STARUISI Hiroaki 211598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 211698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 211798d377a0STARUISI Hiroaki 211898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 211998d377a0STARUISI Hiroaki break; 212098d377a0STARUISI Hiroaki 2121b3b4aa74SDavid Sterba btrfs_release_path(path); 212298d377a0STARUISI Hiroaki key.objectid = key.offset; 21238ad6fcabSChris Mason key.offset = (u64)-1; 212498d377a0STARUISI Hiroaki dirid = key.objectid; 212598d377a0STARUISI Hiroaki } 212677906a50SLi Zefan memmove(name, ptr, total_len); 212798d377a0STARUISI Hiroaki name[total_len] = '\0'; 212898d377a0STARUISI Hiroaki ret = 0; 212998d377a0STARUISI Hiroaki out: 213098d377a0STARUISI Hiroaki btrfs_free_path(path); 2131ac8e9819SChris Mason return ret; 2132ac8e9819SChris Mason } 2133ac8e9819SChris Mason 2134ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2135ac8e9819SChris Mason void __user *argp) 2136ac8e9819SChris Mason { 2137ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2138ac8e9819SChris Mason struct inode *inode; 2139ac8e9819SChris Mason int ret; 2140ac8e9819SChris Mason 2141ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2142ac8e9819SChris Mason return -EPERM; 2143ac8e9819SChris Mason 21442354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 21452354d08fSJulia Lawall if (IS_ERR(args)) 21462354d08fSJulia Lawall return PTR_ERR(args); 2147c2b96929SDan Carpenter 2148496ad9aaSAl Viro inode = file_inode(file); 2149ac8e9819SChris Mason 21501b53ac4dSChris Mason if (args->treeid == 0) 21511b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 21521b53ac4dSChris Mason 2153ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2154ac8e9819SChris Mason args->treeid, args->objectid, 2155ac8e9819SChris Mason args->name); 2156ac8e9819SChris Mason 2157ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2158ac8e9819SChris Mason ret = -EFAULT; 2159ac8e9819SChris Mason 2160ac8e9819SChris Mason kfree(args); 216198d377a0STARUISI Hiroaki return ret; 216298d377a0STARUISI Hiroaki } 216398d377a0STARUISI Hiroaki 216476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 216576dda93cSYan, Zheng void __user *arg) 216676dda93cSYan, Zheng { 216754563d41SAl Viro struct dentry *parent = file->f_path.dentry; 216876dda93cSYan, Zheng struct dentry *dentry; 216976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 217076dda93cSYan, Zheng struct inode *inode; 217176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 217276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 217376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 217476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2175c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2176c58aaad2SMiao Xie u64 qgroup_reserved; 217776dda93cSYan, Zheng int namelen; 217876dda93cSYan, Zheng int ret; 217976dda93cSYan, Zheng int err = 0; 218076dda93cSYan, Zheng 218176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 218276dda93cSYan, Zheng if (IS_ERR(vol_args)) 218376dda93cSYan, Zheng return PTR_ERR(vol_args); 218476dda93cSYan, Zheng 218576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 218676dda93cSYan, Zheng namelen = strlen(vol_args->name); 218776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 218876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 218976dda93cSYan, Zheng err = -EINVAL; 219076dda93cSYan, Zheng goto out; 219176dda93cSYan, Zheng } 219276dda93cSYan, Zheng 2193a561be71SAl Viro err = mnt_want_write_file(file); 219476dda93cSYan, Zheng if (err) 219576dda93cSYan, Zheng goto out; 219676dda93cSYan, Zheng 21975c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 21985c50c9b8SDavid Sterba if (err == -EINTR) 2199e43f998eSDavid Sterba goto out_drop_write; 220076dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 220176dda93cSYan, Zheng if (IS_ERR(dentry)) { 220276dda93cSYan, Zheng err = PTR_ERR(dentry); 220376dda93cSYan, Zheng goto out_unlock_dir; 220476dda93cSYan, Zheng } 220576dda93cSYan, Zheng 220676dda93cSYan, Zheng if (!dentry->d_inode) { 220776dda93cSYan, Zheng err = -ENOENT; 220876dda93cSYan, Zheng goto out_dput; 220976dda93cSYan, Zheng } 221076dda93cSYan, Zheng 221176dda93cSYan, Zheng inode = dentry->d_inode; 22124260f7c7SSage Weil dest = BTRFS_I(inode)->root; 22134260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 22144260f7c7SSage Weil /* 22154260f7c7SSage Weil * Regular user. Only allow this with a special mount 22164260f7c7SSage Weil * option, when the user has write+exec access to the 22174260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 22184260f7c7SSage Weil * allowed. 22194260f7c7SSage Weil * 22204260f7c7SSage Weil * Note that this is _not_ check that the subvol is 22214260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 22224260f7c7SSage Weil * otherwise be able to delete. 22234260f7c7SSage Weil * 22244260f7c7SSage Weil * Users who want to delete empty subvols should try 22254260f7c7SSage Weil * rmdir(2). 22264260f7c7SSage Weil */ 22274260f7c7SSage Weil err = -EPERM; 22284260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 22294260f7c7SSage Weil goto out_dput; 22304260f7c7SSage Weil 22314260f7c7SSage Weil /* 22324260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 22334260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 22344260f7c7SSage Weil * must be called on the dentry referencing the root 22354260f7c7SSage Weil * of the subvol, not a random directory contained 22364260f7c7SSage Weil * within it. 22374260f7c7SSage Weil */ 22384260f7c7SSage Weil err = -EINVAL; 22394260f7c7SSage Weil if (root == dest) 22404260f7c7SSage Weil goto out_dput; 22414260f7c7SSage Weil 22424260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 22434260f7c7SSage Weil if (err) 22444260f7c7SSage Weil goto out_dput; 22455c39da5bSMiao Xie } 22464260f7c7SSage Weil 22475c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 22484260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 22494260f7c7SSage Weil if (err) 22504260f7c7SSage Weil goto out_dput; 22514260f7c7SSage Weil 225233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 225376dda93cSYan, Zheng err = -EINVAL; 225476dda93cSYan, Zheng goto out_dput; 225576dda93cSYan, Zheng } 225676dda93cSYan, Zheng 225776dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 225876dda93cSYan, Zheng err = d_invalidate(dentry); 225976dda93cSYan, Zheng if (err) 226076dda93cSYan, Zheng goto out_unlock; 226176dda93cSYan, Zheng 226276dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 226376dda93cSYan, Zheng 226476dda93cSYan, Zheng err = may_destroy_subvol(dest); 226576dda93cSYan, Zheng if (err) 226676dda93cSYan, Zheng goto out_up_write; 226776dda93cSYan, Zheng 2268c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2269c58aaad2SMiao Xie /* 2270c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2271c58aaad2SMiao Xie * ref/backref. 2272c58aaad2SMiao Xie */ 2273c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2274ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2275c58aaad2SMiao Xie if (err) 2276c58aaad2SMiao Xie goto out_up_write; 2277c58aaad2SMiao Xie 2278a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2279a22285a6SYan, Zheng if (IS_ERR(trans)) { 2280a22285a6SYan, Zheng err = PTR_ERR(trans); 2281c58aaad2SMiao Xie goto out_release; 2282a22285a6SYan, Zheng } 2283c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2284c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2285a22285a6SYan, Zheng 228676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 228776dda93cSYan, Zheng dest->root_key.objectid, 228876dda93cSYan, Zheng dentry->d_name.name, 228976dda93cSYan, Zheng dentry->d_name.len); 229079787eaaSJeff Mahoney if (ret) { 229179787eaaSJeff Mahoney err = ret; 229279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 229379787eaaSJeff Mahoney goto out_end_trans; 229479787eaaSJeff Mahoney } 229576dda93cSYan, Zheng 229676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 229776dda93cSYan, Zheng 229876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 229976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 230076dda93cSYan, Zheng dest->root_item.drop_level = 0; 230176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 230276dda93cSYan, Zheng 2303d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 230476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 230576dda93cSYan, Zheng root->fs_info->tree_root, 230676dda93cSYan, Zheng dest->root_key.objectid); 230779787eaaSJeff Mahoney if (ret) { 230879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 230979787eaaSJeff Mahoney err = ret; 231079787eaaSJeff Mahoney goto out_end_trans; 2311d68fc57bSYan, Zheng } 231279787eaaSJeff Mahoney } 2313dd5f9615SStefan Behrens 2314dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2315dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2316dd5f9615SStefan Behrens dest->root_key.objectid); 2317dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2318dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2319dd5f9615SStefan Behrens err = ret; 2320dd5f9615SStefan Behrens goto out_end_trans; 2321dd5f9615SStefan Behrens } 2322dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2323dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2324dd5f9615SStefan Behrens dest->root_item.received_uuid, 2325dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2326dd5f9615SStefan Behrens dest->root_key.objectid); 2327dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2328dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2329dd5f9615SStefan Behrens err = ret; 2330dd5f9615SStefan Behrens goto out_end_trans; 2331dd5f9615SStefan Behrens } 2332dd5f9615SStefan Behrens } 2333dd5f9615SStefan Behrens 233479787eaaSJeff Mahoney out_end_trans: 2335c58aaad2SMiao Xie trans->block_rsv = NULL; 2336c58aaad2SMiao Xie trans->bytes_reserved = 0; 2337531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 233879787eaaSJeff Mahoney if (ret && !err) 233979787eaaSJeff Mahoney err = ret; 234076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2341c58aaad2SMiao Xie out_release: 2342c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 234376dda93cSYan, Zheng out_up_write: 234476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 234576dda93cSYan, Zheng out_unlock: 234676dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 234776dda93cSYan, Zheng if (!err) { 2348efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 234976dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 235076dda93cSYan, Zheng d_delete(dentry); 2351fa6ac876SLiu Bo 2352fa6ac876SLiu Bo /* the last ref */ 2353fa6ac876SLiu Bo if (dest->cache_inode) { 2354fa6ac876SLiu Bo iput(dest->cache_inode); 2355fa6ac876SLiu Bo dest->cache_inode = NULL; 2356fa6ac876SLiu Bo } 235776dda93cSYan, Zheng } 235876dda93cSYan, Zheng out_dput: 235976dda93cSYan, Zheng dput(dentry); 236076dda93cSYan, Zheng out_unlock_dir: 236176dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2362e43f998eSDavid Sterba out_drop_write: 23632a79f17eSAl Viro mnt_drop_write_file(file); 236476dda93cSYan, Zheng out: 236576dda93cSYan, Zheng kfree(vol_args); 236676dda93cSYan, Zheng return err; 236776dda93cSYan, Zheng } 236876dda93cSYan, Zheng 23691e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2370f46b5a66SChristoph Hellwig { 2371496ad9aaSAl Viro struct inode *inode = file_inode(file); 2372f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 23731e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2374c146afadSYan Zheng int ret; 2375c146afadSYan Zheng 237625122d15SIlya Dryomov ret = mnt_want_write_file(file); 237725122d15SIlya Dryomov if (ret) 237825122d15SIlya Dryomov return ret; 2379b83cc969SLi Zefan 238025122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 238125122d15SIlya Dryomov ret = -EROFS; 238225122d15SIlya Dryomov goto out; 23835ac00addSStefan Behrens } 2384f46b5a66SChristoph Hellwig 2385f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2386f46b5a66SChristoph Hellwig case S_IFDIR: 2387e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2388e441d54dSChris Mason ret = -EPERM; 2389e441d54dSChris Mason goto out; 2390e441d54dSChris Mason } 2391de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 23928929ecfaSYan, Zheng if (ret) 23938929ecfaSYan, Zheng goto out; 2394de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2395f46b5a66SChristoph Hellwig break; 2396f46b5a66SChristoph Hellwig case S_IFREG: 2397e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2398e441d54dSChris Mason ret = -EINVAL; 2399e441d54dSChris Mason goto out; 2400e441d54dSChris Mason } 24011e701a32SChris Mason 24021e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 24031e701a32SChris Mason if (!range) { 24041e701a32SChris Mason ret = -ENOMEM; 24051e701a32SChris Mason goto out; 24061e701a32SChris Mason } 24071e701a32SChris Mason 24081e701a32SChris Mason if (argp) { 24091e701a32SChris Mason if (copy_from_user(range, argp, 24101e701a32SChris Mason sizeof(*range))) { 24111e701a32SChris Mason ret = -EFAULT; 24121e701a32SChris Mason kfree(range); 2413683be16eSDan Carpenter goto out; 24141e701a32SChris Mason } 24151e701a32SChris Mason /* compression requires us to start the IO */ 24161e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 24171e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 24181e701a32SChris Mason range->extent_thresh = (u32)-1; 24191e701a32SChris Mason } 24201e701a32SChris Mason } else { 24211e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 24221e701a32SChris Mason range->len = (u64)-1; 24231e701a32SChris Mason } 2424496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 24254cb5300bSChris Mason range, 0, 0); 24264cb5300bSChris Mason if (ret > 0) 24274cb5300bSChris Mason ret = 0; 24281e701a32SChris Mason kfree(range); 2429f46b5a66SChristoph Hellwig break; 24308929ecfaSYan, Zheng default: 24318929ecfaSYan, Zheng ret = -EINVAL; 2432f46b5a66SChristoph Hellwig } 2433e441d54dSChris Mason out: 243425122d15SIlya Dryomov mnt_drop_write_file(file); 2435e441d54dSChris Mason return ret; 2436f46b5a66SChristoph Hellwig } 2437f46b5a66SChristoph Hellwig 2438b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2439f46b5a66SChristoph Hellwig { 2440f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2441f46b5a66SChristoph Hellwig int ret; 2442f46b5a66SChristoph Hellwig 2443e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2444e441d54dSChris Mason return -EPERM; 2445e441d54dSChris Mason 24465ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 24475ac00addSStefan Behrens 1)) { 2448e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2449c9e9f97bSIlya Dryomov } 2450c9e9f97bSIlya Dryomov 24515ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2452dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2453c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2454c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2455c9e9f97bSIlya Dryomov goto out; 2456c9e9f97bSIlya Dryomov } 2457f46b5a66SChristoph Hellwig 24585516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2459f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2460f46b5a66SChristoph Hellwig 2461f46b5a66SChristoph Hellwig kfree(vol_args); 2462c9e9f97bSIlya Dryomov out: 2463c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24645ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2465f46b5a66SChristoph Hellwig return ret; 2466f46b5a66SChristoph Hellwig } 2467f46b5a66SChristoph Hellwig 2468da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2469f46b5a66SChristoph Hellwig { 2470496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2471f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2472f46b5a66SChristoph Hellwig int ret; 2473f46b5a66SChristoph Hellwig 2474e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2475e441d54dSChris Mason return -EPERM; 2476e441d54dSChris Mason 2477da24927bSMiao Xie ret = mnt_want_write_file(file); 2478da24927bSMiao Xie if (ret) 2479da24927bSMiao Xie return ret; 2480c146afadSYan Zheng 2481dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2482c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2483c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2484c9e9f97bSIlya Dryomov goto out; 2485c9e9f97bSIlya Dryomov } 2486f46b5a66SChristoph Hellwig 24875516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2488f46b5a66SChristoph Hellwig 2489183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2490183860f6SAnand Jain 1)) { 2491183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2492183860f6SAnand Jain goto out; 2493183860f6SAnand Jain } 2494183860f6SAnand Jain 2495183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2496183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2497c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 24985ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2499183860f6SAnand Jain 2500183860f6SAnand Jain out: 2501183860f6SAnand Jain kfree(vol_args); 25024ac20c70SIlya Dryomov mnt_drop_write_file(file); 2503f46b5a66SChristoph Hellwig return ret; 2504f46b5a66SChristoph Hellwig } 2505f46b5a66SChristoph Hellwig 2506475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2507475f6387SJan Schmidt { 2508027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2509475f6387SJan Schmidt struct btrfs_device *device; 2510475f6387SJan Schmidt struct btrfs_device *next; 2511475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2512027ed2f0SLi Zefan int ret = 0; 2513475f6387SJan Schmidt 2514475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2515475f6387SJan Schmidt return -EPERM; 2516475f6387SJan Schmidt 2517027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2518027ed2f0SLi Zefan if (!fi_args) 2519027ed2f0SLi Zefan return -ENOMEM; 2520027ed2f0SLi Zefan 2521f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2522027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2523027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2524475f6387SJan Schmidt 2525475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2526027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2527027ed2f0SLi Zefan fi_args->max_id = device->devid; 2528475f6387SJan Schmidt } 2529475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2530475f6387SJan Schmidt 2531027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2532027ed2f0SLi Zefan ret = -EFAULT; 2533475f6387SJan Schmidt 2534027ed2f0SLi Zefan kfree(fi_args); 2535027ed2f0SLi Zefan return ret; 2536475f6387SJan Schmidt } 2537475f6387SJan Schmidt 2538475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2539475f6387SJan Schmidt { 2540475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2541475f6387SJan Schmidt struct btrfs_device *dev; 2542475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2543475f6387SJan Schmidt int ret = 0; 2544475f6387SJan Schmidt char *s_uuid = NULL; 2545475f6387SJan Schmidt 2546475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2547475f6387SJan Schmidt return -EPERM; 2548475f6387SJan Schmidt 2549475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2550475f6387SJan Schmidt if (IS_ERR(di_args)) 2551475f6387SJan Schmidt return PTR_ERR(di_args); 2552475f6387SJan Schmidt 2553dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2554475f6387SJan Schmidt s_uuid = di_args->uuid; 2555475f6387SJan Schmidt 2556475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2557aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2558475f6387SJan Schmidt 2559475f6387SJan Schmidt if (!dev) { 2560475f6387SJan Schmidt ret = -ENODEV; 2561475f6387SJan Schmidt goto out; 2562475f6387SJan Schmidt } 2563475f6387SJan Schmidt 2564475f6387SJan Schmidt di_args->devid = dev->devid; 2565475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2566475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2567475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2568a27202fbSJim Meyering if (dev->name) { 2569606686eeSJosef Bacik struct rcu_string *name; 2570606686eeSJosef Bacik 2571606686eeSJosef Bacik rcu_read_lock(); 2572606686eeSJosef Bacik name = rcu_dereference(dev->name); 2573606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2574606686eeSJosef Bacik rcu_read_unlock(); 2575a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2576a27202fbSJim Meyering } else { 257799ba55adSStefan Behrens di_args->path[0] = '\0'; 2578a27202fbSJim Meyering } 2579475f6387SJan Schmidt 2580475f6387SJan Schmidt out: 258155793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2582475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2583475f6387SJan Schmidt ret = -EFAULT; 2584475f6387SJan Schmidt 2585475f6387SJan Schmidt kfree(di_args); 2586475f6387SJan Schmidt return ret; 2587475f6387SJan Schmidt } 2588475f6387SJan Schmidt 2589416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2590416161dbSMark Fasheh { 2591416161dbSMark Fasheh struct page *page; 2592416161dbSMark Fasheh pgoff_t index; 2593416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2594416161dbSMark Fasheh 2595416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2596416161dbSMark Fasheh 2597416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2598416161dbSMark Fasheh if (!page) 2599416161dbSMark Fasheh return NULL; 2600416161dbSMark Fasheh 2601416161dbSMark Fasheh if (!PageUptodate(page)) { 2602416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2603416161dbSMark Fasheh 0)) 2604416161dbSMark Fasheh return NULL; 2605416161dbSMark Fasheh lock_page(page); 2606416161dbSMark Fasheh if (!PageUptodate(page)) { 2607416161dbSMark Fasheh unlock_page(page); 2608416161dbSMark Fasheh page_cache_release(page); 2609416161dbSMark Fasheh return NULL; 2610416161dbSMark Fasheh } 2611416161dbSMark Fasheh } 2612416161dbSMark Fasheh unlock_page(page); 2613416161dbSMark Fasheh 2614416161dbSMark Fasheh return page; 2615416161dbSMark Fasheh } 2616416161dbSMark Fasheh 261777fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 261877fe20dcSMark Fasheh { 261977fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 262077fe20dcSMark Fasheh another, and lock file content */ 262177fe20dcSMark Fasheh while (1) { 262277fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 262377fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 262477fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 262577fe20dcSMark Fasheh off + len - 1); 262677fe20dcSMark Fasheh if (!ordered && 262777fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 262877fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 262977fe20dcSMark Fasheh break; 263077fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 263177fe20dcSMark Fasheh if (ordered) 263277fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 263377fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 263477fe20dcSMark Fasheh } 263577fe20dcSMark Fasheh } 263677fe20dcSMark Fasheh 2637416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2638416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2639416161dbSMark Fasheh { 2640416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2641416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2642416161dbSMark Fasheh 2643416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2644416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2645416161dbSMark Fasheh } 2646416161dbSMark Fasheh 2647416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2648416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2649416161dbSMark Fasheh { 2650416161dbSMark Fasheh if (inode1 < inode2) { 2651416161dbSMark Fasheh swap(inode1, inode2); 2652416161dbSMark Fasheh swap(loff1, loff2); 2653416161dbSMark Fasheh } 2654416161dbSMark Fasheh 2655416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2656416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2657416161dbSMark Fasheh if (inode1 != inode2) { 2658416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2659416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2660416161dbSMark Fasheh } 2661416161dbSMark Fasheh } 2662416161dbSMark Fasheh 2663416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2664416161dbSMark Fasheh u64 dst_loff, u64 len) 2665416161dbSMark Fasheh { 2666416161dbSMark Fasheh int ret = 0; 2667416161dbSMark Fasheh struct page *src_page, *dst_page; 2668416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2669416161dbSMark Fasheh void *addr, *dst_addr; 2670416161dbSMark Fasheh 2671416161dbSMark Fasheh while (len) { 2672416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2673416161dbSMark Fasheh cmp_len = len; 2674416161dbSMark Fasheh 2675416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2676416161dbSMark Fasheh if (!src_page) 2677416161dbSMark Fasheh return -EINVAL; 2678416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2679416161dbSMark Fasheh if (!dst_page) { 2680416161dbSMark Fasheh page_cache_release(src_page); 2681416161dbSMark Fasheh return -EINVAL; 2682416161dbSMark Fasheh } 2683416161dbSMark Fasheh addr = kmap_atomic(src_page); 2684416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2685416161dbSMark Fasheh 2686416161dbSMark Fasheh flush_dcache_page(src_page); 2687416161dbSMark Fasheh flush_dcache_page(dst_page); 2688416161dbSMark Fasheh 2689416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2690416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2691416161dbSMark Fasheh 2692416161dbSMark Fasheh kunmap_atomic(addr); 2693416161dbSMark Fasheh kunmap_atomic(dst_addr); 2694416161dbSMark Fasheh page_cache_release(src_page); 2695416161dbSMark Fasheh page_cache_release(dst_page); 2696416161dbSMark Fasheh 2697416161dbSMark Fasheh if (ret) 2698416161dbSMark Fasheh break; 2699416161dbSMark Fasheh 2700416161dbSMark Fasheh loff += cmp_len; 2701416161dbSMark Fasheh dst_loff += cmp_len; 2702416161dbSMark Fasheh len -= cmp_len; 2703416161dbSMark Fasheh } 2704416161dbSMark Fasheh 2705416161dbSMark Fasheh return ret; 2706416161dbSMark Fasheh } 2707416161dbSMark Fasheh 2708416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2709416161dbSMark Fasheh { 2710416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2711416161dbSMark Fasheh 2712416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2713416161dbSMark Fasheh return -EINVAL; 2714416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2715416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2716416161dbSMark Fasheh return -EINVAL; 2717416161dbSMark Fasheh 2718416161dbSMark Fasheh return 0; 2719416161dbSMark Fasheh } 2720416161dbSMark Fasheh 2721416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2722416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2723416161dbSMark Fasheh { 2724416161dbSMark Fasheh int ret; 2725416161dbSMark Fasheh 2726416161dbSMark Fasheh /* 2727416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2728416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2729416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2730416161dbSMark Fasheh */ 2731416161dbSMark Fasheh if (src == dst) 2732416161dbSMark Fasheh return -EINVAL; 2733416161dbSMark Fasheh 2734416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2735416161dbSMark Fasheh 2736416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2737416161dbSMark Fasheh if (ret) 2738416161dbSMark Fasheh goto out_unlock; 2739416161dbSMark Fasheh 2740416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2741416161dbSMark Fasheh if (ret) 2742416161dbSMark Fasheh goto out_unlock; 2743416161dbSMark Fasheh 2744416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2745416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2746416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2747416161dbSMark Fasheh ret = -EINVAL; 2748416161dbSMark Fasheh goto out_unlock; 2749416161dbSMark Fasheh } 2750416161dbSMark Fasheh 2751416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2752416161dbSMark Fasheh if (ret == 0) 2753416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2754416161dbSMark Fasheh 2755416161dbSMark Fasheh out_unlock: 2756416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2757416161dbSMark Fasheh 2758416161dbSMark Fasheh return ret; 2759416161dbSMark Fasheh } 2760416161dbSMark Fasheh 2761416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2762416161dbSMark Fasheh 2763416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2764416161dbSMark Fasheh void __user *argp) 2765416161dbSMark Fasheh { 2766cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2767cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2768cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2769416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2770416161dbSMark Fasheh struct file *dst_file = NULL; 2771416161dbSMark Fasheh struct inode *dst; 2772416161dbSMark Fasheh u64 off; 2773416161dbSMark Fasheh u64 len; 2774416161dbSMark Fasheh int i; 2775416161dbSMark Fasheh int ret; 2776cbf8b8caSMark Fasheh unsigned long size; 2777416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2778416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2779416161dbSMark Fasheh 2780416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2781416161dbSMark Fasheh return -EINVAL; 2782416161dbSMark Fasheh 2783416161dbSMark Fasheh ret = mnt_want_write_file(file); 2784416161dbSMark Fasheh if (ret) 2785416161dbSMark Fasheh return ret; 2786416161dbSMark Fasheh 2787cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2788416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2789cbf8b8caSMark Fasheh sizeof(tmp))) { 2790416161dbSMark Fasheh ret = -EFAULT; 2791416161dbSMark Fasheh goto out; 2792416161dbSMark Fasheh } 2793416161dbSMark Fasheh 2794cbf8b8caSMark Fasheh size = sizeof(tmp) + 2795cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2796cbf8b8caSMark Fasheh 2797229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2798cbf8b8caSMark Fasheh 2799229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2800229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2801cbf8b8caSMark Fasheh goto out; 2802cbf8b8caSMark Fasheh } 2803cbf8b8caSMark Fasheh 2804cbf8b8caSMark Fasheh off = same->logical_offset; 2805cbf8b8caSMark Fasheh len = same->length; 2806416161dbSMark Fasheh 2807416161dbSMark Fasheh /* 2808416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2809416161dbSMark Fasheh * This is intended to bound the total time spent in this 2810416161dbSMark Fasheh * ioctl to something sane. 2811416161dbSMark Fasheh */ 2812416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2813416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2814416161dbSMark Fasheh 2815416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2816416161dbSMark Fasheh /* 2817416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2818416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2819416161dbSMark Fasheh * this situation without an update. 2820416161dbSMark Fasheh */ 2821416161dbSMark Fasheh ret = -EINVAL; 2822416161dbSMark Fasheh goto out; 2823416161dbSMark Fasheh } 2824416161dbSMark Fasheh 2825416161dbSMark Fasheh ret = -EISDIR; 2826416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2827416161dbSMark Fasheh goto out; 2828416161dbSMark Fasheh 2829416161dbSMark Fasheh ret = -EACCES; 2830416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2831416161dbSMark Fasheh goto out; 2832416161dbSMark Fasheh 2833cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2834cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2835cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2836cbf8b8caSMark Fasheh same->info[i].status = 0; 2837416161dbSMark Fasheh } 2838416161dbSMark Fasheh 2839cbf8b8caSMark Fasheh ret = 0; 2840cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2841cbf8b8caSMark Fasheh info = &same->info[i]; 2842416161dbSMark Fasheh 2843cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2844416161dbSMark Fasheh if (!dst_file) { 2845cbf8b8caSMark Fasheh info->status = -EBADF; 2846416161dbSMark Fasheh goto next; 2847416161dbSMark Fasheh } 2848416161dbSMark Fasheh 2849416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2850cbf8b8caSMark Fasheh info->status = -EINVAL; 2851416161dbSMark Fasheh goto next; 2852416161dbSMark Fasheh } 2853416161dbSMark Fasheh 2854cbf8b8caSMark Fasheh info->status = -EXDEV; 2855416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2856416161dbSMark Fasheh goto next; 2857416161dbSMark Fasheh 2858416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2859416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2860416161dbSMark Fasheh goto next; 2861416161dbSMark Fasheh 2862416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2863cbf8b8caSMark Fasheh info->status = -EISDIR; 2864416161dbSMark Fasheh goto next; 2865416161dbSMark Fasheh } 2866416161dbSMark Fasheh 2867416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2868cbf8b8caSMark Fasheh info->status = -EACCES; 2869416161dbSMark Fasheh goto next; 2870416161dbSMark Fasheh } 2871416161dbSMark Fasheh 2872cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2873cbf8b8caSMark Fasheh info->logical_offset); 2874cbf8b8caSMark Fasheh if (info->status == 0) 2875cbf8b8caSMark Fasheh info->bytes_deduped += len; 2876416161dbSMark Fasheh 2877416161dbSMark Fasheh next: 2878416161dbSMark Fasheh if (dst_file) 2879416161dbSMark Fasheh fput(dst_file); 2880cbf8b8caSMark Fasheh } 2881416161dbSMark Fasheh 2882cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2883cbf8b8caSMark Fasheh if (ret) 2884416161dbSMark Fasheh ret = -EFAULT; 2885416161dbSMark Fasheh 2886416161dbSMark Fasheh out: 2887416161dbSMark Fasheh mnt_drop_write_file(file); 2888416161dbSMark Fasheh return ret; 2889416161dbSMark Fasheh } 2890416161dbSMark Fasheh 289132b7c687SMark Fasheh /** 289232b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 289332b7c687SMark Fasheh * 289432b7c687SMark Fasheh * @src: Inode to clone from 289532b7c687SMark Fasheh * @inode: Inode to clone to 289632b7c687SMark Fasheh * @off: Offset within source to start clone from 289732b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 289832b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 289932b7c687SMark Fasheh * identical values here 290032b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 290132b7c687SMark Fasheh */ 290232b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 290332b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2904f46b5a66SChristoph Hellwig { 2905f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 290632b7c687SMark Fasheh struct btrfs_path *path = NULL; 2907f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 290832b7c687SMark Fasheh struct btrfs_trans_handle *trans; 290932b7c687SMark Fasheh char *buf = NULL; 2910ae01a0abSYan Zheng struct btrfs_key key; 2911f46b5a66SChristoph Hellwig u32 nritems; 2912f46b5a66SChristoph Hellwig int slot; 2913ae01a0abSYan Zheng int ret; 291432b7c687SMark Fasheh u64 len = olen_aligned; 2915ae01a0abSYan Zheng 2916ae01a0abSYan Zheng ret = -ENOMEM; 2917ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2918ae01a0abSYan Zheng if (!buf) 291932b7c687SMark Fasheh return ret; 2920ae01a0abSYan Zheng 2921ae01a0abSYan Zheng path = btrfs_alloc_path(); 2922ae01a0abSYan Zheng if (!path) { 2923ae01a0abSYan Zheng vfree(buf); 292432b7c687SMark Fasheh return ret; 2925ae01a0abSYan Zheng } 292632b7c687SMark Fasheh 2927ae01a0abSYan Zheng path->reada = 2; 2928c5c9cd4dSSage Weil /* clone data */ 292933345d01SLi Zefan key.objectid = btrfs_ino(src); 2930ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2931ae01a0abSYan Zheng key.offset = 0; 2932f46b5a66SChristoph Hellwig 2933f46b5a66SChristoph Hellwig while (1) { 2934f46b5a66SChristoph Hellwig /* 2935f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2936f46b5a66SChristoph Hellwig * tree. 2937f46b5a66SChristoph Hellwig */ 2938e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 2939362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2940362a20c5SDavid Sterba 0, 0); 2941f46b5a66SChristoph Hellwig if (ret < 0) 2942f46b5a66SChristoph Hellwig goto out; 2943f46b5a66SChristoph Hellwig 2944ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2945e4355f34SFilipe David Borba Manana process_slot: 2946ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2947362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2948f46b5a66SChristoph Hellwig if (ret < 0) 2949f46b5a66SChristoph Hellwig goto out; 2950f46b5a66SChristoph Hellwig if (ret > 0) 2951f46b5a66SChristoph Hellwig break; 2952ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2953f46b5a66SChristoph Hellwig } 2954f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2955f46b5a66SChristoph Hellwig slot = path->slots[0]; 2956f46b5a66SChristoph Hellwig 2957ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2958d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 295933345d01SLi Zefan key.objectid != btrfs_ino(src)) 2960f46b5a66SChristoph Hellwig break; 2961f46b5a66SChristoph Hellwig 2962c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2963c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2964c5c9cd4dSSage Weil int type; 296531840ae1SZheng Yan u32 size; 296631840ae1SZheng Yan struct btrfs_key new_key; 2967c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2968c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2969c5c9cd4dSSage Weil u8 comp; 2970b5384d48SSage Weil u64 endoff; 297131840ae1SZheng Yan 2972c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2973c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2974c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2975c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2976c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2977c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2978d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2979d397712bSChris Mason extent); 2980d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2981d397712bSChris Mason extent); 2982c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2983d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2984d397712bSChris Mason extent); 2985c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2986c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2987c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2988c5c9cd4dSSage Weil extent); 2989c5c9cd4dSSage Weil } 299031840ae1SZheng Yan 2991050006a7SSage Weil if (key.offset + datal <= off || 2992e4355f34SFilipe David Borba Manana key.offset >= off + len - 1) { 2993e4355f34SFilipe David Borba Manana path->slots[0]++; 2994e4355f34SFilipe David Borba Manana goto process_slot; 2995e4355f34SFilipe David Borba Manana } 2996e4355f34SFilipe David Borba Manana 2997e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 2998e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 2999e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3000e4355f34SFilipe David Borba Manana size); 3001e4355f34SFilipe David Borba Manana 3002e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3003e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3004c5c9cd4dSSage Weil 300531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 300633345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 30074d728ec7SLi Zefan if (off <= key.offset) 3008c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 30094d728ec7SLi Zefan else 30104d728ec7SLi Zefan new_key.offset = destoff; 3011c5c9cd4dSSage Weil 3012b6f3409bSSage Weil /* 3013b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3014b6f3409bSSage Weil * 1 - add new extent 3015b6f3409bSSage Weil * 1 - inode update 3016b6f3409bSSage Weil */ 3017b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3018a22285a6SYan, Zheng if (IS_ERR(trans)) { 3019a22285a6SYan, Zheng ret = PTR_ERR(trans); 3020a22285a6SYan, Zheng goto out; 3021a22285a6SYan, Zheng } 3022a22285a6SYan, Zheng 3023c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3024c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3025d72c0842SLi Zefan /* 3026d72c0842SLi Zefan * a | --- range to clone ---| b 3027d72c0842SLi Zefan * | ------------- extent ------------- | 3028d72c0842SLi Zefan */ 3029d72c0842SLi Zefan 3030d72c0842SLi Zefan /* substract range b */ 3031d72c0842SLi Zefan if (key.offset + datal > off + len) 3032d72c0842SLi Zefan datal = off + len - key.offset; 3033d72c0842SLi Zefan 3034d72c0842SLi Zefan /* substract range a */ 3035a22285a6SYan, Zheng if (off > key.offset) { 3036a22285a6SYan, Zheng datao += off - key.offset; 3037a22285a6SYan, Zheng datal -= off - key.offset; 3038a22285a6SYan, Zheng } 3039a22285a6SYan, Zheng 30405dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3041a22285a6SYan, Zheng new_key.offset, 3042a22285a6SYan, Zheng new_key.offset + datal, 30432671485dSJosef Bacik 1); 304479787eaaSJeff Mahoney if (ret) { 304579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 304679787eaaSJeff Mahoney ret); 304779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 304879787eaaSJeff Mahoney goto out; 304979787eaaSJeff Mahoney } 3050a22285a6SYan, Zheng 305131840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 305231840ae1SZheng Yan &new_key, size); 305379787eaaSJeff Mahoney if (ret) { 305479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 305579787eaaSJeff Mahoney ret); 305679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 305779787eaaSJeff Mahoney goto out; 305879787eaaSJeff Mahoney } 305931840ae1SZheng Yan 306031840ae1SZheng Yan leaf = path->nodes[0]; 306131840ae1SZheng Yan slot = path->slots[0]; 306231840ae1SZheng Yan write_extent_buffer(leaf, buf, 306331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 306431840ae1SZheng Yan size); 3065ae01a0abSYan Zheng 3066f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3067f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3068c5c9cd4dSSage Weil 3069c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3070c5c9cd4dSSage Weil if (!disko) 3071c5c9cd4dSSage Weil datao = 0; 3072c5c9cd4dSSage Weil 3073c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3074c5c9cd4dSSage Weil datao); 3075c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3076c5c9cd4dSSage Weil datal); 3077c5c9cd4dSSage Weil if (disko) { 3078c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3079ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 30805d4f98a2SYan Zheng disko, diskl, 0, 3081f46b5a66SChristoph Hellwig root->root_key.objectid, 308233345d01SLi Zefan btrfs_ino(inode), 308366d7e7f0SArne Jansen new_key.offset - datao, 308466d7e7f0SArne Jansen 0); 308579787eaaSJeff Mahoney if (ret) { 308679787eaaSJeff Mahoney btrfs_abort_transaction(trans, 308779787eaaSJeff Mahoney root, 308879787eaaSJeff Mahoney ret); 308979787eaaSJeff Mahoney btrfs_end_transaction(trans, 309079787eaaSJeff Mahoney root); 309179787eaaSJeff Mahoney goto out; 309279787eaaSJeff Mahoney 309379787eaaSJeff Mahoney } 3094f46b5a66SChristoph Hellwig } 3095c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3096c5c9cd4dSSage Weil u64 skip = 0; 3097c5c9cd4dSSage Weil u64 trim = 0; 3098c5c9cd4dSSage Weil if (off > key.offset) { 3099c5c9cd4dSSage Weil skip = off - key.offset; 3100c5c9cd4dSSage Weil new_key.offset += skip; 310131840ae1SZheng Yan } 3102d397712bSChris Mason 3103c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3104c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3105d397712bSChris Mason 3106c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3107c5c9cd4dSSage Weil ret = -EINVAL; 3108a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3109c5c9cd4dSSage Weil goto out; 311031840ae1SZheng Yan } 3111c5c9cd4dSSage Weil size -= skip + trim; 3112c5c9cd4dSSage Weil datal -= skip + trim; 3113a22285a6SYan, Zheng 31145dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3115a22285a6SYan, Zheng new_key.offset, 3116a22285a6SYan, Zheng new_key.offset + datal, 31172671485dSJosef Bacik 1); 311879787eaaSJeff Mahoney if (ret) { 311979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 312079787eaaSJeff Mahoney ret); 312179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 312279787eaaSJeff Mahoney goto out; 312379787eaaSJeff Mahoney } 3124a22285a6SYan, Zheng 3125c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3126c5c9cd4dSSage Weil &new_key, size); 312779787eaaSJeff Mahoney if (ret) { 312879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 312979787eaaSJeff Mahoney ret); 313079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 313179787eaaSJeff Mahoney goto out; 313279787eaaSJeff Mahoney } 3133c5c9cd4dSSage Weil 3134c5c9cd4dSSage Weil if (skip) { 3135d397712bSChris Mason u32 start = 3136d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3137c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3138c5c9cd4dSSage Weil datal); 3139c5c9cd4dSSage Weil } 3140c5c9cd4dSSage Weil 3141c5c9cd4dSSage Weil leaf = path->nodes[0]; 3142c5c9cd4dSSage Weil slot = path->slots[0]; 3143c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3144c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3145c5c9cd4dSSage Weil size); 3146c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3147c5c9cd4dSSage Weil } 3148c5c9cd4dSSage Weil 3149c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3150b3b4aa74SDavid Sterba btrfs_release_path(path); 3151c5c9cd4dSSage Weil 31520c4d2d95SJosef Bacik inode_inc_iversion(inode); 3153a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3154b5384d48SSage Weil 3155b5384d48SSage Weil /* 3156b5384d48SSage Weil * we round up to the block size at eof when 3157b5384d48SSage Weil * determining which extents to clone above, 3158b5384d48SSage Weil * but shouldn't round up the file size 3159b5384d48SSage Weil */ 3160b5384d48SSage Weil endoff = new_key.offset + datal; 31615f3888ffSLi Zefan if (endoff > destoff+olen) 31625f3888ffSLi Zefan endoff = destoff+olen; 3163b5384d48SSage Weil if (endoff > inode->i_size) 3164b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3165b5384d48SSage Weil 3166a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 316779787eaaSJeff Mahoney if (ret) { 316879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3169a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 317079787eaaSJeff Mahoney goto out; 317179787eaaSJeff Mahoney } 317279787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3173a22285a6SYan, Zheng } 3174b3b4aa74SDavid Sterba btrfs_release_path(path); 3175ae01a0abSYan Zheng key.offset++; 3176ae01a0abSYan Zheng } 3177f46b5a66SChristoph Hellwig ret = 0; 317832b7c687SMark Fasheh 3179f46b5a66SChristoph Hellwig out: 3180b3b4aa74SDavid Sterba btrfs_release_path(path); 318132b7c687SMark Fasheh btrfs_free_path(path); 318232b7c687SMark Fasheh vfree(buf); 318332b7c687SMark Fasheh return ret; 318432b7c687SMark Fasheh } 318532b7c687SMark Fasheh 318632b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 318732b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 318832b7c687SMark Fasheh { 318954563d41SAl Viro struct inode *inode = file_inode(file); 319032b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 319132b7c687SMark Fasheh struct fd src_file; 319232b7c687SMark Fasheh struct inode *src; 319332b7c687SMark Fasheh int ret; 319432b7c687SMark Fasheh u64 len = olen; 319532b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 319632b7c687SMark Fasheh int same_inode = 0; 319732b7c687SMark Fasheh 319832b7c687SMark Fasheh /* 319932b7c687SMark Fasheh * TODO: 320032b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 320132b7c687SMark Fasheh * decompress into destination's address_space (the file offset 320232b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 320332b7c687SMark Fasheh * otherwise reinsert) a subrange. 320432b7c687SMark Fasheh * - allow ranges within the same file to be cloned (provided 320532b7c687SMark Fasheh * they don't overlap)? 320632b7c687SMark Fasheh */ 320732b7c687SMark Fasheh 320832b7c687SMark Fasheh /* the destination must be opened for writing */ 320932b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 321032b7c687SMark Fasheh return -EINVAL; 321132b7c687SMark Fasheh 321232b7c687SMark Fasheh if (btrfs_root_readonly(root)) 321332b7c687SMark Fasheh return -EROFS; 321432b7c687SMark Fasheh 321532b7c687SMark Fasheh ret = mnt_want_write_file(file); 321632b7c687SMark Fasheh if (ret) 321732b7c687SMark Fasheh return ret; 321832b7c687SMark Fasheh 321932b7c687SMark Fasheh src_file = fdget(srcfd); 322032b7c687SMark Fasheh if (!src_file.file) { 322132b7c687SMark Fasheh ret = -EBADF; 322232b7c687SMark Fasheh goto out_drop_write; 322332b7c687SMark Fasheh } 322432b7c687SMark Fasheh 322532b7c687SMark Fasheh ret = -EXDEV; 322632b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 322732b7c687SMark Fasheh goto out_fput; 322832b7c687SMark Fasheh 322932b7c687SMark Fasheh src = file_inode(src_file.file); 323032b7c687SMark Fasheh 323132b7c687SMark Fasheh ret = -EINVAL; 323232b7c687SMark Fasheh if (src == inode) 323332b7c687SMark Fasheh same_inode = 1; 323432b7c687SMark Fasheh 323532b7c687SMark Fasheh /* the src must be open for reading */ 323632b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 323732b7c687SMark Fasheh goto out_fput; 323832b7c687SMark Fasheh 323932b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 324032b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 324132b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 324232b7c687SMark Fasheh goto out_fput; 324332b7c687SMark Fasheh 324432b7c687SMark Fasheh ret = -EISDIR; 324532b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 324632b7c687SMark Fasheh goto out_fput; 324732b7c687SMark Fasheh 324832b7c687SMark Fasheh ret = -EXDEV; 324932b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 325032b7c687SMark Fasheh goto out_fput; 325132b7c687SMark Fasheh 325232b7c687SMark Fasheh if (!same_inode) { 325332b7c687SMark Fasheh if (inode < src) { 325432b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 325532b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 325632b7c687SMark Fasheh } else { 325732b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 325832b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 325932b7c687SMark Fasheh } 326032b7c687SMark Fasheh } else { 326132b7c687SMark Fasheh mutex_lock(&src->i_mutex); 326232b7c687SMark Fasheh } 326332b7c687SMark Fasheh 326432b7c687SMark Fasheh /* determine range to clone */ 326532b7c687SMark Fasheh ret = -EINVAL; 326632b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 326732b7c687SMark Fasheh goto out_unlock; 326832b7c687SMark Fasheh if (len == 0) 326932b7c687SMark Fasheh olen = len = src->i_size - off; 327032b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 327132b7c687SMark Fasheh if (off + len == src->i_size) 327232b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 327332b7c687SMark Fasheh 327432b7c687SMark Fasheh /* verify the end result is block aligned */ 327532b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 327632b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 327732b7c687SMark Fasheh goto out_unlock; 327832b7c687SMark Fasheh 327932b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 328032b7c687SMark Fasheh if (same_inode) { 328132b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 328232b7c687SMark Fasheh goto out_unlock; 328332b7c687SMark Fasheh } 328432b7c687SMark Fasheh 328532b7c687SMark Fasheh if (destoff > inode->i_size) { 328632b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 328732b7c687SMark Fasheh if (ret) 328832b7c687SMark Fasheh goto out_unlock; 328932b7c687SMark Fasheh } 329032b7c687SMark Fasheh 329132b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 329232b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 329332b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 329432b7c687SMark Fasheh 329532b7c687SMark Fasheh lock_extent_range(src, off, len); 329632b7c687SMark Fasheh 329732b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 329832b7c687SMark Fasheh 3299aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3300f46b5a66SChristoph Hellwig out_unlock: 3301c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3302c57c2b3eSFilipe David Borba Manana if (inode < src) { 3303f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3304f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3305c57c2b3eSFilipe David Borba Manana } else { 3306c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3307c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3308c57c2b3eSFilipe David Borba Manana } 3309c57c2b3eSFilipe David Borba Manana } else { 3310c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3311c57c2b3eSFilipe David Borba Manana } 3312f46b5a66SChristoph Hellwig out_fput: 33132903ff01SAl Viro fdput(src_file); 3314ab67b7c1SYan Zheng out_drop_write: 33152a79f17eSAl Viro mnt_drop_write_file(file); 3316f46b5a66SChristoph Hellwig return ret; 3317f46b5a66SChristoph Hellwig } 3318f46b5a66SChristoph Hellwig 33197a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3320c5c9cd4dSSage Weil { 3321c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3322c5c9cd4dSSage Weil 33237a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3324c5c9cd4dSSage Weil return -EFAULT; 3325c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3326c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3327c5c9cd4dSSage Weil } 3328c5c9cd4dSSage Weil 3329f46b5a66SChristoph Hellwig /* 3330f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3331f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3332f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3333f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3334f46b5a66SChristoph Hellwig */ 3335b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3336f46b5a66SChristoph Hellwig { 3337496ad9aaSAl Viro struct inode *inode = file_inode(file); 3338f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3339f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 33401ab86aedSSage Weil int ret; 3341f46b5a66SChristoph Hellwig 33421ab86aedSSage Weil ret = -EPERM; 3343df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3344f46b5a66SChristoph Hellwig goto out; 33451ab86aedSSage Weil 33461ab86aedSSage Weil ret = -EINPROGRESS; 33471ab86aedSSage Weil if (file->private_data) 33481ab86aedSSage Weil goto out; 33499ca9ee09SSage Weil 3350b83cc969SLi Zefan ret = -EROFS; 3351b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3352b83cc969SLi Zefan goto out; 3353b83cc969SLi Zefan 3354a561be71SAl Viro ret = mnt_want_write_file(file); 3355c146afadSYan Zheng if (ret) 3356c146afadSYan Zheng goto out; 3357c146afadSYan Zheng 3358a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 33599ca9ee09SSage Weil 3360f46b5a66SChristoph Hellwig ret = -ENOMEM; 33617a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3362abd30bb0STsutomu Itoh if (IS_ERR(trans)) 33631ab86aedSSage Weil goto out_drop; 33641ab86aedSSage Weil 33651ab86aedSSage Weil file->private_data = trans; 33661ab86aedSSage Weil return 0; 33671ab86aedSSage Weil 33681ab86aedSSage Weil out_drop: 3369a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 33702a79f17eSAl Viro mnt_drop_write_file(file); 3371f46b5a66SChristoph Hellwig out: 3372f46b5a66SChristoph Hellwig return ret; 3373f46b5a66SChristoph Hellwig } 3374f46b5a66SChristoph Hellwig 33756ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33766ef5ed0dSJosef Bacik { 3377496ad9aaSAl Viro struct inode *inode = file_inode(file); 33786ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33796ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33806ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33816ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33826ef5ed0dSJosef Bacik struct btrfs_path *path; 33836ef5ed0dSJosef Bacik struct btrfs_key location; 33846ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33856ef5ed0dSJosef Bacik u64 objectid = 0; 33866ef5ed0dSJosef Bacik u64 dir_id; 33873c04ce01SMiao Xie int ret; 33886ef5ed0dSJosef Bacik 33896ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33906ef5ed0dSJosef Bacik return -EPERM; 33916ef5ed0dSJosef Bacik 33923c04ce01SMiao Xie ret = mnt_want_write_file(file); 33933c04ce01SMiao Xie if (ret) 33943c04ce01SMiao Xie return ret; 33953c04ce01SMiao Xie 33963c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33973c04ce01SMiao Xie ret = -EFAULT; 33983c04ce01SMiao Xie goto out; 33993c04ce01SMiao Xie } 34006ef5ed0dSJosef Bacik 34016ef5ed0dSJosef Bacik if (!objectid) 34021cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34036ef5ed0dSJosef Bacik 34046ef5ed0dSJosef Bacik location.objectid = objectid; 34056ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 34066ef5ed0dSJosef Bacik location.offset = (u64)-1; 34076ef5ed0dSJosef Bacik 34086ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 34093c04ce01SMiao Xie if (IS_ERR(new_root)) { 34103c04ce01SMiao Xie ret = PTR_ERR(new_root); 34113c04ce01SMiao Xie goto out; 34123c04ce01SMiao Xie } 34136ef5ed0dSJosef Bacik 34146ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34153c04ce01SMiao Xie if (!path) { 34163c04ce01SMiao Xie ret = -ENOMEM; 34173c04ce01SMiao Xie goto out; 34183c04ce01SMiao Xie } 34196ef5ed0dSJosef Bacik path->leave_spinning = 1; 34206ef5ed0dSJosef Bacik 34216ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 342298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34236ef5ed0dSJosef Bacik btrfs_free_path(path); 34243c04ce01SMiao Xie ret = PTR_ERR(trans); 34253c04ce01SMiao Xie goto out; 34266ef5ed0dSJosef Bacik } 34276ef5ed0dSJosef Bacik 34286c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 34296ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 34306ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3431cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34326ef5ed0dSJosef Bacik btrfs_free_path(path); 34336ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3434efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3435efe120a0SFrank Holton "item, this isn't going to work"); 34363c04ce01SMiao Xie ret = -ENOENT; 34373c04ce01SMiao Xie goto out; 34386ef5ed0dSJosef Bacik } 34396ef5ed0dSJosef Bacik 34406ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34416ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34426ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34436ef5ed0dSJosef Bacik btrfs_free_path(path); 34446ef5ed0dSJosef Bacik 34452b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 34466ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 34473c04ce01SMiao Xie out: 34483c04ce01SMiao Xie mnt_drop_write_file(file); 34493c04ce01SMiao Xie return ret; 34506ef5ed0dSJosef Bacik } 34516ef5ed0dSJosef Bacik 34525af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3453bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3454bf5fc093SJosef Bacik { 3455bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3456bf5fc093SJosef Bacik 3457bf5fc093SJosef Bacik space->total_bytes = 0; 3458bf5fc093SJosef Bacik space->used_bytes = 0; 3459bf5fc093SJosef Bacik space->flags = 0; 3460bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3461bf5fc093SJosef Bacik space->flags = block_group->flags; 3462bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3463bf5fc093SJosef Bacik space->used_bytes += 3464bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3465bf5fc093SJosef Bacik } 3466bf5fc093SJosef Bacik } 3467bf5fc093SJosef Bacik 346848a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 34691406e432SJosef Bacik { 34701406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34711406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34721406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34737fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 347413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34751406e432SJosef Bacik struct btrfs_space_info *info; 3476bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3477bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3478bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3479bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3480bf5fc093SJosef Bacik int num_types = 4; 34817fde62bfSChris Mason int alloc_size; 34821406e432SJosef Bacik int ret = 0; 348351788b1bSDan Rosenberg u64 slot_count = 0; 3484bf5fc093SJosef Bacik int i, c; 34851406e432SJosef Bacik 34861406e432SJosef Bacik if (copy_from_user(&space_args, 34871406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34881406e432SJosef Bacik sizeof(space_args))) 34891406e432SJosef Bacik return -EFAULT; 34901406e432SJosef Bacik 3491bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3492bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3493bf5fc093SJosef Bacik 3494bf5fc093SJosef Bacik info = NULL; 34957fde62bfSChris Mason rcu_read_lock(); 3496bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3497bf5fc093SJosef Bacik list) { 3498bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3499bf5fc093SJosef Bacik info = tmp; 3500bf5fc093SJosef Bacik break; 3501bf5fc093SJosef Bacik } 3502bf5fc093SJosef Bacik } 35037fde62bfSChris Mason rcu_read_unlock(); 35041406e432SJosef Bacik 3505bf5fc093SJosef Bacik if (!info) 3506bf5fc093SJosef Bacik continue; 3507bf5fc093SJosef Bacik 3508bf5fc093SJosef Bacik down_read(&info->groups_sem); 3509bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3510bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3511bf5fc093SJosef Bacik slot_count++; 3512bf5fc093SJosef Bacik } 3513bf5fc093SJosef Bacik up_read(&info->groups_sem); 3514bf5fc093SJosef Bacik } 3515bf5fc093SJosef Bacik 35167fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35177fde62bfSChris Mason if (space_args.space_slots == 0) { 35187fde62bfSChris Mason space_args.total_spaces = slot_count; 35197fde62bfSChris Mason goto out; 35207fde62bfSChris Mason } 3521bf5fc093SJosef Bacik 352251788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3523bf5fc093SJosef Bacik 35247fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3525bf5fc093SJosef Bacik 35267fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35277fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35287fde62bfSChris Mason */ 35297fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 35307fde62bfSChris Mason return -ENOMEM; 35317fde62bfSChris Mason 35327fde62bfSChris Mason space_args.total_spaces = 0; 35337fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 35347fde62bfSChris Mason if (!dest) 35357fde62bfSChris Mason return -ENOMEM; 35367fde62bfSChris Mason dest_orig = dest; 35377fde62bfSChris Mason 35387fde62bfSChris Mason /* now we have a buffer to copy into */ 3539bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3540bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3541bf5fc093SJosef Bacik 354251788b1bSDan Rosenberg if (!slot_count) 354351788b1bSDan Rosenberg break; 354451788b1bSDan Rosenberg 3545bf5fc093SJosef Bacik info = NULL; 35461406e432SJosef Bacik rcu_read_lock(); 3547bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3548bf5fc093SJosef Bacik list) { 3549bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3550bf5fc093SJosef Bacik info = tmp; 35517fde62bfSChris Mason break; 3552bf5fc093SJosef Bacik } 3553bf5fc093SJosef Bacik } 3554bf5fc093SJosef Bacik rcu_read_unlock(); 35557fde62bfSChris Mason 3556bf5fc093SJosef Bacik if (!info) 3557bf5fc093SJosef Bacik continue; 3558bf5fc093SJosef Bacik down_read(&info->groups_sem); 3559bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3560bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 35615af3e8ccSStefan Behrens btrfs_get_block_group_info( 35625af3e8ccSStefan Behrens &info->block_groups[c], &space); 35637fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35641406e432SJosef Bacik dest++; 35651406e432SJosef Bacik space_args.total_spaces++; 356651788b1bSDan Rosenberg slot_count--; 35671406e432SJosef Bacik } 356851788b1bSDan Rosenberg if (!slot_count) 356951788b1bSDan Rosenberg break; 3570bf5fc093SJosef Bacik } 3571bf5fc093SJosef Bacik up_read(&info->groups_sem); 3572bf5fc093SJosef Bacik } 35731406e432SJosef Bacik 35742eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35757fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35767fde62bfSChris Mason 35777fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35787fde62bfSChris Mason ret = -EFAULT; 35797fde62bfSChris Mason 35807fde62bfSChris Mason kfree(dest_orig); 35817fde62bfSChris Mason out: 35827fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35831406e432SJosef Bacik ret = -EFAULT; 35841406e432SJosef Bacik 35851406e432SJosef Bacik return ret; 35861406e432SJosef Bacik } 35871406e432SJosef Bacik 3588f46b5a66SChristoph Hellwig /* 3589f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3590f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3591f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3592f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3593f46b5a66SChristoph Hellwig */ 3594f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3595f46b5a66SChristoph Hellwig { 3596496ad9aaSAl Viro struct inode *inode = file_inode(file); 3597f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3598f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3599f46b5a66SChristoph Hellwig 3600f46b5a66SChristoph Hellwig trans = file->private_data; 36011ab86aedSSage Weil if (!trans) 36021ab86aedSSage Weil return -EINVAL; 3603b214107eSChristoph Hellwig file->private_data = NULL; 36049ca9ee09SSage Weil 36051ab86aedSSage Weil btrfs_end_transaction(trans, root); 36061ab86aedSSage Weil 3607a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 36089ca9ee09SSage Weil 36092a79f17eSAl Viro mnt_drop_write_file(file); 36101ab86aedSSage Weil return 0; 3611f46b5a66SChristoph Hellwig } 3612f46b5a66SChristoph Hellwig 36139a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36149a8c28beSMiao Xie void __user *argp) 361546204592SSage Weil { 361646204592SSage Weil struct btrfs_trans_handle *trans; 361746204592SSage Weil u64 transid; 3618db5b493aSTsutomu Itoh int ret; 361946204592SSage Weil 3620d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3621ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3622ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 362398d5dc13STsutomu Itoh return PTR_ERR(trans); 3624ff7c1d33SMiao Xie 3625ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3626ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3627ff7c1d33SMiao Xie goto out; 3628ff7c1d33SMiao Xie } 362946204592SSage Weil transid = trans->transid; 3630db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 36318b2b2d3cSTsutomu Itoh if (ret) { 36328b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3633db5b493aSTsutomu Itoh return ret; 36348b2b2d3cSTsutomu Itoh } 3635ff7c1d33SMiao Xie out: 363646204592SSage Weil if (argp) 363746204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 363846204592SSage Weil return -EFAULT; 363946204592SSage Weil return 0; 364046204592SSage Weil } 364146204592SSage Weil 36429a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 36439a8c28beSMiao Xie void __user *argp) 364446204592SSage Weil { 364546204592SSage Weil u64 transid; 364646204592SSage Weil 364746204592SSage Weil if (argp) { 364846204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 364946204592SSage Weil return -EFAULT; 365046204592SSage Weil } else { 365146204592SSage Weil transid = 0; /* current trans */ 365246204592SSage Weil } 365346204592SSage Weil return btrfs_wait_for_commit(root, transid); 365446204592SSage Weil } 365546204592SSage Weil 3656b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3657475f6387SJan Schmidt { 3658496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3659475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3660b8e95489SMiao Xie int ret; 3661475f6387SJan Schmidt 3662475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3663475f6387SJan Schmidt return -EPERM; 3664475f6387SJan Schmidt 3665475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3666475f6387SJan Schmidt if (IS_ERR(sa)) 3667475f6387SJan Schmidt return PTR_ERR(sa); 3668475f6387SJan Schmidt 3669b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3670b8e95489SMiao Xie ret = mnt_want_write_file(file); 3671b8e95489SMiao Xie if (ret) 3672b8e95489SMiao Xie goto out; 3673b8e95489SMiao Xie } 3674b8e95489SMiao Xie 3675aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 367663a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 367763a212abSStefan Behrens 0); 3678475f6387SJan Schmidt 3679475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3680475f6387SJan Schmidt ret = -EFAULT; 3681475f6387SJan Schmidt 3682b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3683b8e95489SMiao Xie mnt_drop_write_file(file); 3684b8e95489SMiao Xie out: 3685475f6387SJan Schmidt kfree(sa); 3686475f6387SJan Schmidt return ret; 3687475f6387SJan Schmidt } 3688475f6387SJan Schmidt 3689475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3690475f6387SJan Schmidt { 3691475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3692475f6387SJan Schmidt return -EPERM; 3693475f6387SJan Schmidt 3694aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3695475f6387SJan Schmidt } 3696475f6387SJan Schmidt 3697475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3698475f6387SJan Schmidt void __user *arg) 3699475f6387SJan Schmidt { 3700475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3701475f6387SJan Schmidt int ret; 3702475f6387SJan Schmidt 3703475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3704475f6387SJan Schmidt return -EPERM; 3705475f6387SJan Schmidt 3706475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3707475f6387SJan Schmidt if (IS_ERR(sa)) 3708475f6387SJan Schmidt return PTR_ERR(sa); 3709475f6387SJan Schmidt 3710475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3711475f6387SJan Schmidt 3712475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3713475f6387SJan Schmidt ret = -EFAULT; 3714475f6387SJan Schmidt 3715475f6387SJan Schmidt kfree(sa); 3716475f6387SJan Schmidt return ret; 3717475f6387SJan Schmidt } 3718475f6387SJan Schmidt 3719c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3720b27f7c0cSDavid Sterba void __user *arg) 3721c11d2c23SStefan Behrens { 3722c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3723c11d2c23SStefan Behrens int ret; 3724c11d2c23SStefan Behrens 3725c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3726c11d2c23SStefan Behrens if (IS_ERR(sa)) 3727c11d2c23SStefan Behrens return PTR_ERR(sa); 3728c11d2c23SStefan Behrens 3729b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3730b27f7c0cSDavid Sterba kfree(sa); 3731b27f7c0cSDavid Sterba return -EPERM; 3732b27f7c0cSDavid Sterba } 3733b27f7c0cSDavid Sterba 3734b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3735c11d2c23SStefan Behrens 3736c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3737c11d2c23SStefan Behrens ret = -EFAULT; 3738c11d2c23SStefan Behrens 3739c11d2c23SStefan Behrens kfree(sa); 3740c11d2c23SStefan Behrens return ret; 3741c11d2c23SStefan Behrens } 3742c11d2c23SStefan Behrens 37433f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 37443f6bcfbdSStefan Behrens { 37453f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37463f6bcfbdSStefan Behrens int ret; 37473f6bcfbdSStefan Behrens 37483f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37493f6bcfbdSStefan Behrens return -EPERM; 37503f6bcfbdSStefan Behrens 37513f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37523f6bcfbdSStefan Behrens if (IS_ERR(p)) 37533f6bcfbdSStefan Behrens return PTR_ERR(p); 37543f6bcfbdSStefan Behrens 37553f6bcfbdSStefan Behrens switch (p->cmd) { 37563f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3757adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3758adfa97cbSIlya Dryomov ret = -EROFS; 3759adfa97cbSIlya Dryomov goto out; 3760adfa97cbSIlya Dryomov } 37613f6bcfbdSStefan Behrens if (atomic_xchg( 37623f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 37633f6bcfbdSStefan Behrens 1)) { 3764e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37653f6bcfbdSStefan Behrens } else { 37663f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 37673f6bcfbdSStefan Behrens atomic_set( 37683f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 37693f6bcfbdSStefan Behrens 0); 37703f6bcfbdSStefan Behrens } 37713f6bcfbdSStefan Behrens break; 37723f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37733f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 37743f6bcfbdSStefan Behrens ret = 0; 37753f6bcfbdSStefan Behrens break; 37763f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 37773f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 37783f6bcfbdSStefan Behrens break; 37793f6bcfbdSStefan Behrens default: 37803f6bcfbdSStefan Behrens ret = -EINVAL; 37813f6bcfbdSStefan Behrens break; 37823f6bcfbdSStefan Behrens } 37833f6bcfbdSStefan Behrens 37843f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 37853f6bcfbdSStefan Behrens ret = -EFAULT; 3786adfa97cbSIlya Dryomov out: 37873f6bcfbdSStefan Behrens kfree(p); 37883f6bcfbdSStefan Behrens return ret; 37893f6bcfbdSStefan Behrens } 37903f6bcfbdSStefan Behrens 3791d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3792d7728c96SJan Schmidt { 3793d7728c96SJan Schmidt int ret = 0; 3794d7728c96SJan Schmidt int i; 3795740c3d22SChris Mason u64 rel_ptr; 3796d7728c96SJan Schmidt int size; 3797806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3798d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3799d7728c96SJan Schmidt struct btrfs_path *path; 3800d7728c96SJan Schmidt 380182b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3802d7728c96SJan Schmidt return -EPERM; 3803d7728c96SJan Schmidt 3804d7728c96SJan Schmidt path = btrfs_alloc_path(); 3805d7728c96SJan Schmidt if (!path) { 3806d7728c96SJan Schmidt ret = -ENOMEM; 3807d7728c96SJan Schmidt goto out; 3808d7728c96SJan Schmidt } 3809d7728c96SJan Schmidt 3810d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3811d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3812d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3813d7728c96SJan Schmidt ipa = NULL; 3814d7728c96SJan Schmidt goto out; 3815d7728c96SJan Schmidt } 3816d7728c96SJan Schmidt 3817d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3818d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3819d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3820d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3821d7728c96SJan Schmidt ipath = NULL; 3822d7728c96SJan Schmidt goto out; 3823d7728c96SJan Schmidt } 3824d7728c96SJan Schmidt 3825d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3826d7728c96SJan Schmidt if (ret < 0) 3827d7728c96SJan Schmidt goto out; 3828d7728c96SJan Schmidt 3829d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3830745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3831745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3832740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3833d7728c96SJan Schmidt } 3834d7728c96SJan Schmidt 3835745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3836745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3837d7728c96SJan Schmidt if (ret) { 3838d7728c96SJan Schmidt ret = -EFAULT; 3839d7728c96SJan Schmidt goto out; 3840d7728c96SJan Schmidt } 3841d7728c96SJan Schmidt 3842d7728c96SJan Schmidt out: 3843d7728c96SJan Schmidt btrfs_free_path(path); 3844d7728c96SJan Schmidt free_ipath(ipath); 3845d7728c96SJan Schmidt kfree(ipa); 3846d7728c96SJan Schmidt 3847d7728c96SJan Schmidt return ret; 3848d7728c96SJan Schmidt } 3849d7728c96SJan Schmidt 3850d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3851d7728c96SJan Schmidt { 3852d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3853d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3854d7728c96SJan Schmidt 3855d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3856d7728c96SJan Schmidt inodes->bytes_left -= c; 3857d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3858d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3859d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3860d7728c96SJan Schmidt inodes->elem_cnt += 3; 3861d7728c96SJan Schmidt } else { 3862d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3863d7728c96SJan Schmidt inodes->bytes_left = 0; 3864d7728c96SJan Schmidt inodes->elem_missed += 3; 3865d7728c96SJan Schmidt } 3866d7728c96SJan Schmidt 3867d7728c96SJan Schmidt return 0; 3868d7728c96SJan Schmidt } 3869d7728c96SJan Schmidt 3870d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3871d7728c96SJan Schmidt void __user *arg) 3872d7728c96SJan Schmidt { 3873d7728c96SJan Schmidt int ret = 0; 3874d7728c96SJan Schmidt int size; 3875d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3876d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3877d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3878d7728c96SJan Schmidt 3879d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3880d7728c96SJan Schmidt return -EPERM; 3881d7728c96SJan Schmidt 3882d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3883d7728c96SJan Schmidt if (IS_ERR(loi)) { 3884d7728c96SJan Schmidt ret = PTR_ERR(loi); 3885d7728c96SJan Schmidt loi = NULL; 3886d7728c96SJan Schmidt goto out; 3887d7728c96SJan Schmidt } 3888d7728c96SJan Schmidt 3889d7728c96SJan Schmidt path = btrfs_alloc_path(); 3890d7728c96SJan Schmidt if (!path) { 3891d7728c96SJan Schmidt ret = -ENOMEM; 3892d7728c96SJan Schmidt goto out; 3893d7728c96SJan Schmidt } 3894d7728c96SJan Schmidt 3895425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3896d7728c96SJan Schmidt inodes = init_data_container(size); 3897d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3898d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3899d7728c96SJan Schmidt inodes = NULL; 3900d7728c96SJan Schmidt goto out; 3901d7728c96SJan Schmidt } 3902d7728c96SJan Schmidt 3903df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3904df031f07SLiu Bo build_ino_list, inodes); 3905df031f07SLiu Bo if (ret == -EINVAL) 3906d7728c96SJan Schmidt ret = -ENOENT; 3907d7728c96SJan Schmidt if (ret < 0) 3908d7728c96SJan Schmidt goto out; 3909d7728c96SJan Schmidt 3910745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3911745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3912d7728c96SJan Schmidt if (ret) 3913d7728c96SJan Schmidt ret = -EFAULT; 3914d7728c96SJan Schmidt 3915d7728c96SJan Schmidt out: 3916d7728c96SJan Schmidt btrfs_free_path(path); 3917425d17a2SLiu Bo vfree(inodes); 3918d7728c96SJan Schmidt kfree(loi); 3919d7728c96SJan Schmidt 3920d7728c96SJan Schmidt return ret; 3921d7728c96SJan Schmidt } 3922d7728c96SJan Schmidt 392319a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3924c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3925c9e9f97bSIlya Dryomov { 3926c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3927c9e9f97bSIlya Dryomov 3928c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3929c9e9f97bSIlya Dryomov 3930837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3931837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3932837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3933837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3934a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3935a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3936837d5b6eSIlya Dryomov 3937c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3938c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3939c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 394019a39dceSIlya Dryomov 394119a39dceSIlya Dryomov if (lock) { 394219a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 394319a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 394419a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 394519a39dceSIlya Dryomov } else { 394619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 394719a39dceSIlya Dryomov } 3948c9e9f97bSIlya Dryomov } 3949c9e9f97bSIlya Dryomov 39509ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3951c9e9f97bSIlya Dryomov { 3952496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3953c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3954c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3955c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3956ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3957c9e9f97bSIlya Dryomov int ret; 3958c9e9f97bSIlya Dryomov 3959c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3960c9e9f97bSIlya Dryomov return -EPERM; 3961c9e9f97bSIlya Dryomov 3962e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39639ba1f6e4SLiu Bo if (ret) 39649ba1f6e4SLiu Bo return ret; 39659ba1f6e4SLiu Bo 3966ed0fb78fSIlya Dryomov again: 3967ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 3968c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3969c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3970ed0fb78fSIlya Dryomov need_unlock = true; 3971ed0fb78fSIlya Dryomov goto locked; 3972ed0fb78fSIlya Dryomov } 3973ed0fb78fSIlya Dryomov 3974ed0fb78fSIlya Dryomov /* 3975ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 3976ed0fb78fSIlya Dryomov * (1) some other op is running 3977ed0fb78fSIlya Dryomov * (2) balance is running 3978ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3979ed0fb78fSIlya Dryomov */ 3980ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3981ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3982ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 3983ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 3984ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3985ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 3986ed0fb78fSIlya Dryomov goto again; 3987ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3988ed0fb78fSIlya Dryomov 3989ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 3990ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 3991ed0fb78fSIlya Dryomov /* this is (3) */ 3992ed0fb78fSIlya Dryomov need_unlock = false; 3993ed0fb78fSIlya Dryomov goto locked; 3994ed0fb78fSIlya Dryomov } 3995ed0fb78fSIlya Dryomov 3996ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3997ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3998ed0fb78fSIlya Dryomov goto again; 3999ed0fb78fSIlya Dryomov } else { 4000ed0fb78fSIlya Dryomov /* this is (2) */ 4001ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4002ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4003ed0fb78fSIlya Dryomov goto out; 4004ed0fb78fSIlya Dryomov } 4005ed0fb78fSIlya Dryomov } else { 4006ed0fb78fSIlya Dryomov /* this is (1) */ 4007ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4008e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4009ed0fb78fSIlya Dryomov goto out; 4010ed0fb78fSIlya Dryomov } 4011ed0fb78fSIlya Dryomov 4012ed0fb78fSIlya Dryomov locked: 4013ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4014c9e9f97bSIlya Dryomov 4015c9e9f97bSIlya Dryomov if (arg) { 4016c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4017c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4018c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4019ed0fb78fSIlya Dryomov goto out_unlock; 4020c9e9f97bSIlya Dryomov } 4021de322263SIlya Dryomov 4022de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4023de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4024de322263SIlya Dryomov ret = -ENOTCONN; 4025de322263SIlya Dryomov goto out_bargs; 4026de322263SIlya Dryomov } 4027de322263SIlya Dryomov 4028de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4029de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4030de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4031de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4032de322263SIlya Dryomov 4033de322263SIlya Dryomov goto do_balance; 4034de322263SIlya Dryomov } 4035c9e9f97bSIlya Dryomov } else { 4036c9e9f97bSIlya Dryomov bargs = NULL; 4037c9e9f97bSIlya Dryomov } 4038c9e9f97bSIlya Dryomov 4039ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4040837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4041837d5b6eSIlya Dryomov goto out_bargs; 4042837d5b6eSIlya Dryomov } 4043837d5b6eSIlya Dryomov 4044c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4045c9e9f97bSIlya Dryomov if (!bctl) { 4046c9e9f97bSIlya Dryomov ret = -ENOMEM; 4047c9e9f97bSIlya Dryomov goto out_bargs; 4048c9e9f97bSIlya Dryomov } 4049c9e9f97bSIlya Dryomov 4050c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4051c9e9f97bSIlya Dryomov if (arg) { 4052c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4053c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4054c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4055c9e9f97bSIlya Dryomov 4056c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4057f43ffb60SIlya Dryomov } else { 4058f43ffb60SIlya Dryomov /* balance everything - no filters */ 4059f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4060c9e9f97bSIlya Dryomov } 4061c9e9f97bSIlya Dryomov 4062de322263SIlya Dryomov do_balance: 4063c9e9f97bSIlya Dryomov /* 4064ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4065ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4066ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4067ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4068ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4069c9e9f97bSIlya Dryomov */ 4070ed0fb78fSIlya Dryomov need_unlock = false; 4071ed0fb78fSIlya Dryomov 4072ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4073ed0fb78fSIlya Dryomov 4074c9e9f97bSIlya Dryomov if (arg) { 4075c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4076c9e9f97bSIlya Dryomov ret = -EFAULT; 4077c9e9f97bSIlya Dryomov } 4078c9e9f97bSIlya Dryomov 4079c9e9f97bSIlya Dryomov out_bargs: 4080c9e9f97bSIlya Dryomov kfree(bargs); 4081ed0fb78fSIlya Dryomov out_unlock: 4082c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4083c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4084ed0fb78fSIlya Dryomov if (need_unlock) 4085ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4086ed0fb78fSIlya Dryomov out: 4087e54bfa31SLiu Bo mnt_drop_write_file(file); 4088c9e9f97bSIlya Dryomov return ret; 4089c9e9f97bSIlya Dryomov } 4090c9e9f97bSIlya Dryomov 4091837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4092837d5b6eSIlya Dryomov { 4093837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4094837d5b6eSIlya Dryomov return -EPERM; 4095837d5b6eSIlya Dryomov 4096837d5b6eSIlya Dryomov switch (cmd) { 4097837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4098837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4099a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4100a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4101837d5b6eSIlya Dryomov } 4102837d5b6eSIlya Dryomov 4103837d5b6eSIlya Dryomov return -EINVAL; 4104837d5b6eSIlya Dryomov } 4105837d5b6eSIlya Dryomov 410619a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 410719a39dceSIlya Dryomov void __user *arg) 410819a39dceSIlya Dryomov { 410919a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 411019a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 411119a39dceSIlya Dryomov int ret = 0; 411219a39dceSIlya Dryomov 411319a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 411419a39dceSIlya Dryomov return -EPERM; 411519a39dceSIlya Dryomov 411619a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 411719a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 411819a39dceSIlya Dryomov ret = -ENOTCONN; 411919a39dceSIlya Dryomov goto out; 412019a39dceSIlya Dryomov } 412119a39dceSIlya Dryomov 412219a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 412319a39dceSIlya Dryomov if (!bargs) { 412419a39dceSIlya Dryomov ret = -ENOMEM; 412519a39dceSIlya Dryomov goto out; 412619a39dceSIlya Dryomov } 412719a39dceSIlya Dryomov 412819a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 412919a39dceSIlya Dryomov 413019a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 413119a39dceSIlya Dryomov ret = -EFAULT; 413219a39dceSIlya Dryomov 413319a39dceSIlya Dryomov kfree(bargs); 413419a39dceSIlya Dryomov out: 413519a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 413619a39dceSIlya Dryomov return ret; 413719a39dceSIlya Dryomov } 413819a39dceSIlya Dryomov 4139905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41405d13a37bSArne Jansen { 4141496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41425d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41435d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 41445d13a37bSArne Jansen int ret; 41455d13a37bSArne Jansen int err; 41465d13a37bSArne Jansen 41475d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41485d13a37bSArne Jansen return -EPERM; 41495d13a37bSArne Jansen 4150905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4151905b0ddaSMiao Xie if (ret) 4152905b0ddaSMiao Xie return ret; 41535d13a37bSArne Jansen 41545d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4155905b0ddaSMiao Xie if (IS_ERR(sa)) { 4156905b0ddaSMiao Xie ret = PTR_ERR(sa); 4157905b0ddaSMiao Xie goto drop_write; 4158905b0ddaSMiao Xie } 41595d13a37bSArne Jansen 41607708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 416192f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 41625d13a37bSArne Jansen if (IS_ERR(trans)) { 41635d13a37bSArne Jansen ret = PTR_ERR(trans); 41645d13a37bSArne Jansen goto out; 41655d13a37bSArne Jansen } 41665d13a37bSArne Jansen 41675d13a37bSArne Jansen switch (sa->cmd) { 41685d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 41695d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 41705d13a37bSArne Jansen break; 41715d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 41725d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 41735d13a37bSArne Jansen break; 41745d13a37bSArne Jansen default: 41755d13a37bSArne Jansen ret = -EINVAL; 41765d13a37bSArne Jansen break; 41775d13a37bSArne Jansen } 41785d13a37bSArne Jansen 417992f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 41805d13a37bSArne Jansen if (err && !ret) 41815d13a37bSArne Jansen ret = err; 41825d13a37bSArne Jansen out: 41835d13a37bSArne Jansen kfree(sa); 41847708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4185905b0ddaSMiao Xie drop_write: 4186905b0ddaSMiao Xie mnt_drop_write_file(file); 41875d13a37bSArne Jansen return ret; 41885d13a37bSArne Jansen } 41895d13a37bSArne Jansen 4190905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41915d13a37bSArne Jansen { 4192496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41935d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41945d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41955d13a37bSArne Jansen int ret; 41965d13a37bSArne Jansen int err; 41975d13a37bSArne Jansen 41985d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41995d13a37bSArne Jansen return -EPERM; 42005d13a37bSArne Jansen 4201905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4202905b0ddaSMiao Xie if (ret) 4203905b0ddaSMiao Xie return ret; 42045d13a37bSArne Jansen 42055d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4206905b0ddaSMiao Xie if (IS_ERR(sa)) { 4207905b0ddaSMiao Xie ret = PTR_ERR(sa); 4208905b0ddaSMiao Xie goto drop_write; 4209905b0ddaSMiao Xie } 42105d13a37bSArne Jansen 42115d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42125d13a37bSArne Jansen if (IS_ERR(trans)) { 42135d13a37bSArne Jansen ret = PTR_ERR(trans); 42145d13a37bSArne Jansen goto out; 42155d13a37bSArne Jansen } 42165d13a37bSArne Jansen 42175d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42185d13a37bSArne Jansen if (sa->assign) { 42195d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 42205d13a37bSArne Jansen sa->src, sa->dst); 42215d13a37bSArne Jansen } else { 42225d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 42235d13a37bSArne Jansen sa->src, sa->dst); 42245d13a37bSArne Jansen } 42255d13a37bSArne Jansen 42265d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42275d13a37bSArne Jansen if (err && !ret) 42285d13a37bSArne Jansen ret = err; 42295d13a37bSArne Jansen 42305d13a37bSArne Jansen out: 42315d13a37bSArne Jansen kfree(sa); 4232905b0ddaSMiao Xie drop_write: 4233905b0ddaSMiao Xie mnt_drop_write_file(file); 42345d13a37bSArne Jansen return ret; 42355d13a37bSArne Jansen } 42365d13a37bSArne Jansen 4237905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42385d13a37bSArne Jansen { 4239496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42405d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42415d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42425d13a37bSArne Jansen int ret; 42435d13a37bSArne Jansen int err; 42445d13a37bSArne Jansen 42455d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42465d13a37bSArne Jansen return -EPERM; 42475d13a37bSArne Jansen 4248905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4249905b0ddaSMiao Xie if (ret) 4250905b0ddaSMiao Xie return ret; 42515d13a37bSArne Jansen 42525d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4253905b0ddaSMiao Xie if (IS_ERR(sa)) { 4254905b0ddaSMiao Xie ret = PTR_ERR(sa); 4255905b0ddaSMiao Xie goto drop_write; 4256905b0ddaSMiao Xie } 42575d13a37bSArne Jansen 4258d86e56cfSMiao Xie if (!sa->qgroupid) { 4259d86e56cfSMiao Xie ret = -EINVAL; 4260d86e56cfSMiao Xie goto out; 4261d86e56cfSMiao Xie } 4262d86e56cfSMiao Xie 42635d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42645d13a37bSArne Jansen if (IS_ERR(trans)) { 42655d13a37bSArne Jansen ret = PTR_ERR(trans); 42665d13a37bSArne Jansen goto out; 42675d13a37bSArne Jansen } 42685d13a37bSArne Jansen 42695d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42705d13a37bSArne Jansen if (sa->create) { 42715d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 42725d13a37bSArne Jansen NULL); 42735d13a37bSArne Jansen } else { 42745d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 42755d13a37bSArne Jansen } 42765d13a37bSArne Jansen 42775d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42785d13a37bSArne Jansen if (err && !ret) 42795d13a37bSArne Jansen ret = err; 42805d13a37bSArne Jansen 42815d13a37bSArne Jansen out: 42825d13a37bSArne Jansen kfree(sa); 4283905b0ddaSMiao Xie drop_write: 4284905b0ddaSMiao Xie mnt_drop_write_file(file); 42855d13a37bSArne Jansen return ret; 42865d13a37bSArne Jansen } 42875d13a37bSArne Jansen 4288905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42895d13a37bSArne Jansen { 4290496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42915d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42925d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42935d13a37bSArne Jansen int ret; 42945d13a37bSArne Jansen int err; 42955d13a37bSArne Jansen u64 qgroupid; 42965d13a37bSArne Jansen 42975d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42985d13a37bSArne Jansen return -EPERM; 42995d13a37bSArne Jansen 4300905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4301905b0ddaSMiao Xie if (ret) 4302905b0ddaSMiao Xie return ret; 43035d13a37bSArne Jansen 43045d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4305905b0ddaSMiao Xie if (IS_ERR(sa)) { 4306905b0ddaSMiao Xie ret = PTR_ERR(sa); 4307905b0ddaSMiao Xie goto drop_write; 4308905b0ddaSMiao Xie } 43095d13a37bSArne Jansen 43105d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43115d13a37bSArne Jansen if (IS_ERR(trans)) { 43125d13a37bSArne Jansen ret = PTR_ERR(trans); 43135d13a37bSArne Jansen goto out; 43145d13a37bSArne Jansen } 43155d13a37bSArne Jansen 43165d13a37bSArne Jansen qgroupid = sa->qgroupid; 43175d13a37bSArne Jansen if (!qgroupid) { 43185d13a37bSArne Jansen /* take the current subvol as qgroup */ 43195d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43205d13a37bSArne Jansen } 43215d13a37bSArne Jansen 43225d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 43235d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 43245d13a37bSArne Jansen 43255d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 43265d13a37bSArne Jansen if (err && !ret) 43275d13a37bSArne Jansen ret = err; 43285d13a37bSArne Jansen 43295d13a37bSArne Jansen out: 43305d13a37bSArne Jansen kfree(sa); 4331905b0ddaSMiao Xie drop_write: 4332905b0ddaSMiao Xie mnt_drop_write_file(file); 43335d13a37bSArne Jansen return ret; 43345d13a37bSArne Jansen } 43355d13a37bSArne Jansen 43362f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43372f232036SJan Schmidt { 43386d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43392f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43402f232036SJan Schmidt int ret; 43412f232036SJan Schmidt 43422f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43432f232036SJan Schmidt return -EPERM; 43442f232036SJan Schmidt 43452f232036SJan Schmidt ret = mnt_want_write_file(file); 43462f232036SJan Schmidt if (ret) 43472f232036SJan Schmidt return ret; 43482f232036SJan Schmidt 43492f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43502f232036SJan Schmidt if (IS_ERR(qsa)) { 43512f232036SJan Schmidt ret = PTR_ERR(qsa); 43522f232036SJan Schmidt goto drop_write; 43532f232036SJan Schmidt } 43542f232036SJan Schmidt 43552f232036SJan Schmidt if (qsa->flags) { 43562f232036SJan Schmidt ret = -EINVAL; 43572f232036SJan Schmidt goto out; 43582f232036SJan Schmidt } 43592f232036SJan Schmidt 43602f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 43612f232036SJan Schmidt 43622f232036SJan Schmidt out: 43632f232036SJan Schmidt kfree(qsa); 43642f232036SJan Schmidt drop_write: 43652f232036SJan Schmidt mnt_drop_write_file(file); 43662f232036SJan Schmidt return ret; 43672f232036SJan Schmidt } 43682f232036SJan Schmidt 43692f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 43702f232036SJan Schmidt { 43716d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43722f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43732f232036SJan Schmidt int ret = 0; 43742f232036SJan Schmidt 43752f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43762f232036SJan Schmidt return -EPERM; 43772f232036SJan Schmidt 43782f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 43792f232036SJan Schmidt if (!qsa) 43802f232036SJan Schmidt return -ENOMEM; 43812f232036SJan Schmidt 43822f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43832f232036SJan Schmidt qsa->flags = 1; 43842f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 43852f232036SJan Schmidt } 43862f232036SJan Schmidt 43872f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43882f232036SJan Schmidt ret = -EFAULT; 43892f232036SJan Schmidt 43902f232036SJan Schmidt kfree(qsa); 43912f232036SJan Schmidt return ret; 43922f232036SJan Schmidt } 43932f232036SJan Schmidt 439457254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 439557254b6eSJan Schmidt { 439654563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 439757254b6eSJan Schmidt 439857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 439957254b6eSJan Schmidt return -EPERM; 440057254b6eSJan Schmidt 440157254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 440257254b6eSJan Schmidt } 440357254b6eSJan Schmidt 4404*abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4405*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44068ea05e3aSAlexander Block { 4407496ad9aaSAl Viro struct inode *inode = file_inode(file); 44088ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44098ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44108ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 44118ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 44128ea05e3aSAlexander Block int ret = 0; 4413dd5f9615SStefan Behrens int received_uuid_changed; 44148ea05e3aSAlexander Block 4415bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4416bd60ea0fSDavid Sterba return -EPERM; 4417bd60ea0fSDavid Sterba 44188ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44198ea05e3aSAlexander Block if (ret < 0) 44208ea05e3aSAlexander Block return ret; 44218ea05e3aSAlexander Block 44228ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 44238ea05e3aSAlexander Block 44248ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 44258ea05e3aSAlexander Block ret = -EINVAL; 44268ea05e3aSAlexander Block goto out; 44278ea05e3aSAlexander Block } 44288ea05e3aSAlexander Block 44298ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44308ea05e3aSAlexander Block ret = -EROFS; 44318ea05e3aSAlexander Block goto out; 44328ea05e3aSAlexander Block } 44338ea05e3aSAlexander Block 4434dd5f9615SStefan Behrens /* 4435dd5f9615SStefan Behrens * 1 - root item 4436dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4437dd5f9615SStefan Behrens */ 4438dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44398ea05e3aSAlexander Block if (IS_ERR(trans)) { 44408ea05e3aSAlexander Block ret = PTR_ERR(trans); 44418ea05e3aSAlexander Block trans = NULL; 44428ea05e3aSAlexander Block goto out; 44438ea05e3aSAlexander Block } 44448ea05e3aSAlexander Block 44458ea05e3aSAlexander Block sa->rtransid = trans->transid; 44468ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44478ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44488ea05e3aSAlexander Block 4449dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4450dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4451dd5f9615SStefan Behrens if (received_uuid_changed && 4452dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4453dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4454dd5f9615SStefan Behrens root_item->received_uuid, 4455dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4456dd5f9615SStefan Behrens root->root_key.objectid); 44578ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44588ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44598ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44603cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44613cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44623cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44633cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44648ea05e3aSAlexander Block 44658ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 44668ea05e3aSAlexander Block &root->root_key, &root->root_item); 44678ea05e3aSAlexander Block if (ret < 0) { 44688ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 44698ea05e3aSAlexander Block goto out; 4470dd5f9615SStefan Behrens } 4471dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4472dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4473dd5f9615SStefan Behrens sa->uuid, 4474dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4475dd5f9615SStefan Behrens root->root_key.objectid); 4476dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4477dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4478dd5f9615SStefan Behrens goto out; 4479dd5f9615SStefan Behrens } 4480dd5f9615SStefan Behrens } 44818ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4482dd5f9615SStefan Behrens if (ret < 0) { 4483dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 44848ea05e3aSAlexander Block goto out; 44858ea05e3aSAlexander Block } 44868ea05e3aSAlexander Block 4487*abccd00fSHugo Mills out: 4488*abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4489*abccd00fSHugo Mills mnt_drop_write_file(file); 4490*abccd00fSHugo Mills return ret; 4491*abccd00fSHugo Mills } 4492*abccd00fSHugo Mills 4493*abccd00fSHugo Mills #ifdef CONFIG_64BIT 4494*abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4495*abccd00fSHugo Mills void __user *arg) 4496*abccd00fSHugo Mills { 4497*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4498*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4499*abccd00fSHugo Mills int ret = 0; 4500*abccd00fSHugo Mills 4501*abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4502*abccd00fSHugo Mills if (IS_ERR(args32)) { 4503*abccd00fSHugo Mills ret = PTR_ERR(args32); 4504*abccd00fSHugo Mills args32 = NULL; 4505*abccd00fSHugo Mills goto out; 4506*abccd00fSHugo Mills } 4507*abccd00fSHugo Mills 4508*abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 4509*abccd00fSHugo Mills if (IS_ERR(args64)) { 4510*abccd00fSHugo Mills ret = PTR_ERR(args64); 4511*abccd00fSHugo Mills args64 = NULL; 4512*abccd00fSHugo Mills goto out; 4513*abccd00fSHugo Mills } 4514*abccd00fSHugo Mills 4515*abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4516*abccd00fSHugo Mills args64->stransid = args32->stransid; 4517*abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4518*abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4519*abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4520*abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4521*abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4522*abccd00fSHugo Mills args64->flags = args32->flags; 4523*abccd00fSHugo Mills 4524*abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4525*abccd00fSHugo Mills if (ret) 4526*abccd00fSHugo Mills goto out; 4527*abccd00fSHugo Mills 4528*abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4529*abccd00fSHugo Mills args32->stransid = args64->stransid; 4530*abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4531*abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4532*abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4533*abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4534*abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4535*abccd00fSHugo Mills args32->flags = args64->flags; 4536*abccd00fSHugo Mills 4537*abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4538*abccd00fSHugo Mills if (ret) 4539*abccd00fSHugo Mills ret = -EFAULT; 4540*abccd00fSHugo Mills 4541*abccd00fSHugo Mills out: 4542*abccd00fSHugo Mills kfree(args32); 4543*abccd00fSHugo Mills kfree(args64); 4544*abccd00fSHugo Mills return ret; 4545*abccd00fSHugo Mills } 4546*abccd00fSHugo Mills #endif 4547*abccd00fSHugo Mills 4548*abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4549*abccd00fSHugo Mills void __user *arg) 4550*abccd00fSHugo Mills { 4551*abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4552*abccd00fSHugo Mills int ret = 0; 4553*abccd00fSHugo Mills 4554*abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4555*abccd00fSHugo Mills if (IS_ERR(sa)) { 4556*abccd00fSHugo Mills ret = PTR_ERR(sa); 4557*abccd00fSHugo Mills sa = NULL; 4558*abccd00fSHugo Mills goto out; 4559*abccd00fSHugo Mills } 4560*abccd00fSHugo Mills 4561*abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4562*abccd00fSHugo Mills 4563*abccd00fSHugo Mills if (ret) 4564*abccd00fSHugo Mills goto out; 4565*abccd00fSHugo Mills 45668ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45678ea05e3aSAlexander Block if (ret) 45688ea05e3aSAlexander Block ret = -EFAULT; 45698ea05e3aSAlexander Block 45708ea05e3aSAlexander Block out: 45718ea05e3aSAlexander Block kfree(sa); 45728ea05e3aSAlexander Block return ret; 45738ea05e3aSAlexander Block } 45748ea05e3aSAlexander Block 4575867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4576867ab667Sjeff.liu { 45776d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4578a1b83ac5SAnand Jain size_t len; 4579867ab667Sjeff.liu int ret; 4580a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4581a1b83ac5SAnand Jain 4582a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4583a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4584a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4585a1b83ac5SAnand Jain 4586a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4587867ab667Sjeff.liu 4588867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4589efe120a0SFrank Holton btrfs_warn(root->fs_info, 4590efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 4591867ab667Sjeff.liu } 4592867ab667Sjeff.liu 4593867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4594867ab667Sjeff.liu 4595867ab667Sjeff.liu return ret ? -EFAULT : 0; 4596867ab667Sjeff.liu } 4597867ab667Sjeff.liu 4598a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4599a8bfd4abSjeff.liu { 46006d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4601a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4602a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4603a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4604a8bfd4abSjeff.liu int ret; 4605a8bfd4abSjeff.liu 4606a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4607a8bfd4abSjeff.liu return -EPERM; 4608a8bfd4abSjeff.liu 4609a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4610a8bfd4abSjeff.liu return -EFAULT; 4611a8bfd4abSjeff.liu 4612a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4613efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 4614a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4615a8bfd4abSjeff.liu return -EINVAL; 4616a8bfd4abSjeff.liu } 4617a8bfd4abSjeff.liu 4618a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4619a8bfd4abSjeff.liu if (ret) 4620a8bfd4abSjeff.liu return ret; 4621a8bfd4abSjeff.liu 4622a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4623a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4624a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4625a8bfd4abSjeff.liu goto out_unlock; 4626a8bfd4abSjeff.liu } 4627a8bfd4abSjeff.liu 4628a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4629a8bfd4abSjeff.liu strcpy(super_block->label, label); 4630a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4631d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 4632a8bfd4abSjeff.liu 4633a8bfd4abSjeff.liu out_unlock: 4634a8bfd4abSjeff.liu mnt_drop_write_file(file); 4635a8bfd4abSjeff.liu return ret; 4636a8bfd4abSjeff.liu } 4637a8bfd4abSjeff.liu 46382eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46392eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46402eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46412eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46422eaa055fSJeff Mahoney 46432eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 46442eaa055fSJeff Mahoney void __user *arg) 46452eaa055fSJeff Mahoney { 46462eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 46472eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46482eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46492eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46502eaa055fSJeff Mahoney }; 46512eaa055fSJeff Mahoney 46522eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46532eaa055fSJeff Mahoney return -EFAULT; 46542eaa055fSJeff Mahoney 46552eaa055fSJeff Mahoney return 0; 46562eaa055fSJeff Mahoney } 46572eaa055fSJeff Mahoney 46582eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 46592eaa055fSJeff Mahoney { 46602eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46612eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 46622eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46632eaa055fSJeff Mahoney 46642eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46652eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46662eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46672eaa055fSJeff Mahoney 46682eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46692eaa055fSJeff Mahoney return -EFAULT; 46702eaa055fSJeff Mahoney 46712eaa055fSJeff Mahoney return 0; 46722eaa055fSJeff Mahoney } 46732eaa055fSJeff Mahoney 46743b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 46753b02a68aSJeff Mahoney enum btrfs_feature_set set, 46762eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46772eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46782eaa055fSJeff Mahoney { 46793b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 46803b02a68aSJeff Mahoney char *names; 46812eaa055fSJeff Mahoney u64 disallowed, unsupported; 46822eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46832eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46842eaa055fSJeff Mahoney 46852eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46862eaa055fSJeff Mahoney if (unsupported) { 46873b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46883b02a68aSJeff Mahoney if (names) { 46893b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 46903b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46913b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46923b02a68aSJeff Mahoney kfree(names); 46933b02a68aSJeff Mahoney } else 46942eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 46952eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46962eaa055fSJeff Mahoney type, unsupported); 46972eaa055fSJeff Mahoney return -EOPNOTSUPP; 46982eaa055fSJeff Mahoney } 46992eaa055fSJeff Mahoney 47002eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47012eaa055fSJeff Mahoney if (disallowed) { 47023b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47033b02a68aSJeff Mahoney if (names) { 47043b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 47053b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47063b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47073b02a68aSJeff Mahoney kfree(names); 47083b02a68aSJeff Mahoney } else 47092eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 47102eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47112eaa055fSJeff Mahoney type, disallowed); 47122eaa055fSJeff Mahoney return -EPERM; 47132eaa055fSJeff Mahoney } 47142eaa055fSJeff Mahoney 47152eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47162eaa055fSJeff Mahoney if (disallowed) { 47173b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47183b02a68aSJeff Mahoney if (names) { 47193b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 47203b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47213b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47223b02a68aSJeff Mahoney kfree(names); 47233b02a68aSJeff Mahoney } else 47242eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 47252eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47262eaa055fSJeff Mahoney type, disallowed); 47272eaa055fSJeff Mahoney return -EPERM; 47282eaa055fSJeff Mahoney } 47292eaa055fSJeff Mahoney 47302eaa055fSJeff Mahoney return 0; 47312eaa055fSJeff Mahoney } 47322eaa055fSJeff Mahoney 47332eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 47343b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 47352eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47362eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47372eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47382eaa055fSJeff Mahoney 47392eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47402eaa055fSJeff Mahoney { 47412eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47422eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 47432eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47442eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47452eaa055fSJeff Mahoney u64 newflags; 47462eaa055fSJeff Mahoney int ret; 47472eaa055fSJeff Mahoney 47482eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47492eaa055fSJeff Mahoney return -EPERM; 47502eaa055fSJeff Mahoney 47512eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47522eaa055fSJeff Mahoney return -EFAULT; 47532eaa055fSJeff Mahoney 47542eaa055fSJeff Mahoney /* Nothing to do */ 47552eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47562eaa055fSJeff Mahoney !flags[0].incompat_flags) 47572eaa055fSJeff Mahoney return 0; 47582eaa055fSJeff Mahoney 47592eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 47602eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47612eaa055fSJeff Mahoney if (ret) 47622eaa055fSJeff Mahoney return ret; 47632eaa055fSJeff Mahoney 47642eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 47652eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47662eaa055fSJeff Mahoney if (ret) 47672eaa055fSJeff Mahoney return ret; 47682eaa055fSJeff Mahoney 47692eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 47702eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47712eaa055fSJeff Mahoney if (ret) 47722eaa055fSJeff Mahoney return ret; 47732eaa055fSJeff Mahoney 47748051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47752eaa055fSJeff Mahoney if (IS_ERR(trans)) 47762eaa055fSJeff Mahoney return PTR_ERR(trans); 47772eaa055fSJeff Mahoney 47782eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 47792eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47802eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47812eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47822eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47832eaa055fSJeff Mahoney 47842eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47852eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47862eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47872eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47882eaa055fSJeff Mahoney 47892eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47902eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47912eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47922eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47932eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 47942eaa055fSJeff Mahoney 4795d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 47962eaa055fSJeff Mahoney } 47972eaa055fSJeff Mahoney 4798f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4799f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4800f46b5a66SChristoph Hellwig { 4801496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48024bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4803f46b5a66SChristoph Hellwig 4804f46b5a66SChristoph Hellwig switch (cmd) { 48056cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48066cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48076cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48086cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48096cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48106cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4811f7039b1dSLi Dongyang case FITRIM: 4812f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4813f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4814fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4815fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4816fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48173de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4818fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48196f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48206f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 482176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 482276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 48230caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48240caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48250caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48260caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48276ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48286ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4829f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48301e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48311e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48321e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4833f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4834198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4835f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48364bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4837f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4838da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4839475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4840475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4841475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4842475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4843f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48449ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4845f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4846c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4847c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 48487a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4849f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4850f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4851f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4852f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4853ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4854ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4855ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4856ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4857d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4858d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4859d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4860d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 48611406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48621406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 48639b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48649b199859SFilipe David Borba Manana int ret; 48659b199859SFilipe David Borba Manana 486691aef86fSMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0); 48679b199859SFilipe David Borba Manana if (ret) 48689b199859SFilipe David Borba Manana return ret; 48699b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 48709b199859SFilipe David Borba Manana return ret; 48719b199859SFilipe David Borba Manana } 487246204592SSage Weil case BTRFS_IOC_START_SYNC: 48739a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 487446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48759a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4876475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4877b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4878475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4879475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4880475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4881475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4882c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48839ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4884837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4885837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 488619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 488719a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 48888ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48898ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4890*abccd00fSHugo Mills #ifdef CONFIG_64BIT 4891*abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4892*abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4893*abccd00fSHugo Mills #endif 489431db9f7cSAlexander Block case BTRFS_IOC_SEND: 489531db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4896c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4897b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 48985d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4899905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49005d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4901905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49025d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4903905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49045d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4905905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49062f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49072f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49082f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 49092f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 491057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 491157254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 49123f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49133f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4914867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4915867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4916a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4917a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4918416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4919416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 49202eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 49212eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 49222eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 49232eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 49242eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49252eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4926f46b5a66SChristoph Hellwig } 4927f46b5a66SChristoph Hellwig 4928f46b5a66SChristoph Hellwig return -ENOTTY; 4929f46b5a66SChristoph Hellwig } 4930