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" 61fcebe456SJosef Bacik #include "qgroup.h" 62f46b5a66SChristoph Hellwig 63abccd00fSHugo Mills #ifdef CONFIG_64BIT 64abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 65abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 66abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 67abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 68abccd00fSHugo Mills */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 70abccd00fSHugo Mills __u64 sec; 71abccd00fSHugo Mills __u32 nsec; 72abccd00fSHugo Mills } __attribute__ ((__packed__)); 73abccd00fSHugo Mills 74abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 75abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 76abccd00fSHugo Mills __u64 stransid; /* in */ 77abccd00fSHugo Mills __u64 rtransid; /* out */ 78abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 79abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 80abccd00fSHugo Mills __u64 flags; /* in */ 81abccd00fSHugo Mills __u64 reserved[16]; /* in */ 82abccd00fSHugo Mills } __attribute__ ((__packed__)); 83abccd00fSHugo Mills 84abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 85abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 86abccd00fSHugo Mills #endif 87abccd00fSHugo Mills 88abccd00fSHugo Mills 89416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 90416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 91416161dbSMark Fasheh 926cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 936cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 946cbff00fSChristoph Hellwig { 956cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 966cbff00fSChristoph Hellwig return flags; 976cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 986cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 996cbff00fSChristoph Hellwig else 1006cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1016cbff00fSChristoph Hellwig } 102f46b5a66SChristoph Hellwig 1036cbff00fSChristoph Hellwig /* 1046cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1056cbff00fSChristoph Hellwig */ 1066cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 125d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 126d0092bddSLi Zefan iflags |= FS_COMPR_FL; 127d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 128d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1366cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1386cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1436cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1456cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1476cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1496cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig /* 1586cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1596cbff00fSChristoph Hellwig * 160e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1616cbff00fSChristoph Hellwig */ 1626cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1636cbff00fSChristoph Hellwig { 1640b4dcea5SChris Mason unsigned int flags; 1650b4dcea5SChris Mason 1660b4dcea5SChris Mason if (!dir) 1670b4dcea5SChris Mason return; 1680b4dcea5SChris Mason 1690b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1706cbff00fSChristoph Hellwig 171e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 172e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 173e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 174e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 175e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 176e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 177e27425d6SJosef Bacik } 1786cbff00fSChristoph Hellwig 179213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 180e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 181213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 182213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 183213490b3SLiu Bo } 184e27425d6SJosef Bacik 1856cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1866cbff00fSChristoph Hellwig } 1876cbff00fSChristoph Hellwig 1886cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1896cbff00fSChristoph Hellwig { 190496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1916cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1926cbff00fSChristoph Hellwig 1936cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1946cbff00fSChristoph Hellwig return -EFAULT; 1956cbff00fSChristoph Hellwig return 0; 1966cbff00fSChristoph Hellwig } 1976cbff00fSChristoph Hellwig 19875e7cb7fSLiu Bo static int check_flags(unsigned int flags) 19975e7cb7fSLiu Bo { 20075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 203e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 204e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20575e7cb7fSLiu Bo return -EOPNOTSUPP; 20675e7cb7fSLiu Bo 20775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20875e7cb7fSLiu Bo return -EINVAL; 20975e7cb7fSLiu Bo 21075e7cb7fSLiu Bo return 0; 21175e7cb7fSLiu Bo } 21275e7cb7fSLiu Bo 2136cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2146cbff00fSChristoph Hellwig { 215496ad9aaSAl Viro struct inode *inode = file_inode(file); 2166cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2176cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2186cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2196cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2206cbff00fSChristoph Hellwig int ret; 221f062abf0SLi Zefan u64 ip_oldflags; 222f062abf0SLi Zefan unsigned int i_oldflags; 2237e97b8daSDavid Sterba umode_t mode; 2246cbff00fSChristoph Hellwig 225bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 226bd60ea0fSDavid Sterba return -EPERM; 227bd60ea0fSDavid Sterba 228b83cc969SLi Zefan if (btrfs_root_readonly(root)) 229b83cc969SLi Zefan return -EROFS; 230b83cc969SLi Zefan 2316cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2326cbff00fSChristoph Hellwig return -EFAULT; 2336cbff00fSChristoph Hellwig 23475e7cb7fSLiu Bo ret = check_flags(flags); 23575e7cb7fSLiu Bo if (ret) 23675e7cb7fSLiu Bo return ret; 2376cbff00fSChristoph Hellwig 238e7848683SJan Kara ret = mnt_want_write_file(file); 239e7848683SJan Kara if (ret) 240e7848683SJan Kara return ret; 241e7848683SJan Kara 2426cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2436cbff00fSChristoph Hellwig 244f062abf0SLi Zefan ip_oldflags = ip->flags; 245f062abf0SLi Zefan i_oldflags = inode->i_flags; 2467e97b8daSDavid Sterba mode = inode->i_mode; 247f062abf0SLi Zefan 2486cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2496cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2506cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2516cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2526cbff00fSChristoph Hellwig ret = -EPERM; 2536cbff00fSChristoph Hellwig goto out_unlock; 2546cbff00fSChristoph Hellwig } 2556cbff00fSChristoph Hellwig } 2566cbff00fSChristoph Hellwig 2576cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2586cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2596cbff00fSChristoph Hellwig else 2606cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2616cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2626cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2636cbff00fSChristoph Hellwig else 2646cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2656cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2666cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2676cbff00fSChristoph Hellwig else 2686cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2696cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2706cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2716cbff00fSChristoph Hellwig else 2726cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2736cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2746cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2756cbff00fSChristoph Hellwig else 2766cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2776cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2786cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2796cbff00fSChristoph Hellwig else 2806cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2817e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2827e97b8daSDavid Sterba if (S_ISREG(mode)) { 2837e97b8daSDavid Sterba /* 2847e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2857e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2867e97b8daSDavid Sterba * status of the file and will not set it. 2877e97b8daSDavid Sterba */ 2887e97b8daSDavid Sterba if (inode->i_size == 0) 2897e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2907e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2917e97b8daSDavid Sterba } else { 292e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2937e97b8daSDavid Sterba } 2947e97b8daSDavid Sterba } else { 2957e97b8daSDavid Sterba /* 2967e97b8daSDavid Sterba * Revert back under same assuptions as above 2977e97b8daSDavid Sterba */ 2987e97b8daSDavid Sterba if (S_ISREG(mode)) { 2997e97b8daSDavid Sterba if (inode->i_size == 0) 3007e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 3017e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 3027e97b8daSDavid Sterba } else { 303e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3047e97b8daSDavid Sterba } 3057e97b8daSDavid Sterba } 3066cbff00fSChristoph Hellwig 30775e7cb7fSLiu Bo /* 30875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 31075e7cb7fSLiu Bo * things smaller. 31175e7cb7fSLiu Bo */ 31275e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 31375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31563541927SFilipe David Borba Manana 31663541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31763541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31863541927SFilipe David Borba Manana goto out_drop; 31975e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 32063541927SFilipe David Borba Manana const char *comp; 32163541927SFilipe David Borba Manana 32275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 32375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32463541927SFilipe David Borba Manana 32563541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32663541927SFilipe David Borba Manana comp = "lzo"; 32763541927SFilipe David Borba Manana else 32863541927SFilipe David Borba Manana comp = "zlib"; 32963541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 33063541927SFilipe David Borba Manana comp, strlen(comp), 0); 33163541927SFilipe David Borba Manana if (ret) 33263541927SFilipe David Borba Manana goto out_drop; 33363541927SFilipe David Borba Manana 334ebcb904dSLi Zefan } else { 33578a017a2SFilipe Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 33678a017a2SFilipe Manana if (ret && ret != -ENODATA) 33778a017a2SFilipe Manana goto out_drop; 338ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 33975e7cb7fSLiu Bo } 3406cbff00fSChristoph Hellwig 3414da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 342f062abf0SLi Zefan if (IS_ERR(trans)) { 343f062abf0SLi Zefan ret = PTR_ERR(trans); 344f062abf0SLi Zefan goto out_drop; 345f062abf0SLi Zefan } 3466cbff00fSChristoph Hellwig 347306424ccSLi Zefan btrfs_update_iflags(inode); 3480c4d2d95SJosef Bacik inode_inc_iversion(inode); 349306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3506cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3516cbff00fSChristoph Hellwig 3526cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 353f062abf0SLi Zefan out_drop: 354f062abf0SLi Zefan if (ret) { 355f062abf0SLi Zefan ip->flags = ip_oldflags; 356f062abf0SLi Zefan inode->i_flags = i_oldflags; 357f062abf0SLi Zefan } 3586cbff00fSChristoph Hellwig 3596cbff00fSChristoph Hellwig out_unlock: 3606cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 361e7848683SJan Kara mnt_drop_write_file(file); 3622d4e6f6aSliubo return ret; 3636cbff00fSChristoph Hellwig } 3646cbff00fSChristoph Hellwig 3656cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3666cbff00fSChristoph Hellwig { 367496ad9aaSAl Viro struct inode *inode = file_inode(file); 3686cbff00fSChristoph Hellwig 3696cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3706cbff00fSChristoph Hellwig } 371f46b5a66SChristoph Hellwig 372f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 373f7039b1dSLi Dongyang { 37454563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 375f7039b1dSLi Dongyang struct btrfs_device *device; 376f7039b1dSLi Dongyang struct request_queue *q; 377f7039b1dSLi Dongyang struct fstrim_range range; 378f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 379f7039b1dSLi Dongyang u64 num_devices = 0; 380815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 381f7039b1dSLi Dongyang int ret; 382f7039b1dSLi Dongyang 383f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 384f7039b1dSLi Dongyang return -EPERM; 385f7039b1dSLi Dongyang 3861f78160cSXiao Guangrong rcu_read_lock(); 3871f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3881f78160cSXiao Guangrong dev_list) { 389f7039b1dSLi Dongyang if (!device->bdev) 390f7039b1dSLi Dongyang continue; 391f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 392f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 393f7039b1dSLi Dongyang num_devices++; 394f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 395f7039b1dSLi Dongyang minlen); 396f7039b1dSLi Dongyang } 397f7039b1dSLi Dongyang } 3981f78160cSXiao Guangrong rcu_read_unlock(); 399f4c697e6SLukas Czerner 400f7039b1dSLi Dongyang if (!num_devices) 401f7039b1dSLi Dongyang return -EOPNOTSUPP; 402f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 403f7039b1dSLi Dongyang return -EFAULT; 404e515c18bSLukas Czerner if (range.start > total_bytes || 405e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 406f4c697e6SLukas Czerner return -EINVAL; 407f7039b1dSLi Dongyang 408f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 409f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 410815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 411f7039b1dSLi Dongyang if (ret < 0) 412f7039b1dSLi Dongyang return ret; 413f7039b1dSLi Dongyang 414f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 415f7039b1dSLi Dongyang return -EFAULT; 416f7039b1dSLi Dongyang 417f7039b1dSLi Dongyang return 0; 418f7039b1dSLi Dongyang } 419f7039b1dSLi Dongyang 420dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 421dd5f9615SStefan Behrens { 42246e0f66aSChris Mason int i; 42346e0f66aSChris Mason 42446e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 42546e0f66aSChris Mason if (uuid[i]) 42646e0f66aSChris Mason return 0; 42746e0f66aSChris Mason } 42846e0f66aSChris Mason return 1; 429dd5f9615SStefan Behrens } 430dd5f9615SStefan Behrens 431d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 432cb8e7090SChristoph Hellwig struct dentry *dentry, 43372fd032eSSage Weil char *name, int namelen, 4346f72c7e2SArne Jansen u64 *async_transid, 4358696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 436f46b5a66SChristoph Hellwig { 437f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 438f46b5a66SChristoph Hellwig struct btrfs_key key; 439f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 440f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 441f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 442d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 44376dda93cSYan, Zheng struct btrfs_root *new_root; 444d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4458ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4465662344bSTsutomu Itoh struct inode *inode; 447f46b5a66SChristoph Hellwig int ret; 448f46b5a66SChristoph Hellwig int err; 449f46b5a66SChristoph Hellwig u64 objectid; 450f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4513de4586cSChris Mason u64 index = 0; 452d5c12070SMiao Xie u64 qgroup_reserved; 4538ea05e3aSAlexander Block uuid_le new_uuid; 454f46b5a66SChristoph Hellwig 455581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4562fbe8c8aSAl Viro if (ret) 457a22285a6SYan, Zheng return ret; 4586a912213SJosef Bacik 459d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4609ed74f2dSJosef Bacik /* 461d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 462d5c12070SMiao Xie * of create_snapshot(). 4639ed74f2dSJosef Bacik */ 464d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 465dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 466d5c12070SMiao Xie if (ret) 467d5c12070SMiao Xie return ret; 468f46b5a66SChristoph Hellwig 469d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 470d5c12070SMiao Xie if (IS_ERR(trans)) { 471d5c12070SMiao Xie ret = PTR_ERR(trans); 472de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 473de6e8200SLiu Bo qgroup_reserved); 474de6e8200SLiu Bo return ret; 475d5c12070SMiao Xie } 476d5c12070SMiao Xie trans->block_rsv = &block_rsv; 477d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 478f46b5a66SChristoph Hellwig 4798696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4806f72c7e2SArne Jansen if (ret) 4816f72c7e2SArne Jansen goto fail; 4826f72c7e2SArne Jansen 483707e8a07SDavid Sterba leaf = btrfs_alloc_free_block(trans, root, root->nodesize, 4845581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4858e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4868e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4878e8a1e31SJosef Bacik goto fail; 4888e8a1e31SJosef Bacik } 489f46b5a66SChristoph Hellwig 4905d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 491f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 492f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4935d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 494f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 495f46b5a66SChristoph Hellwig 4960a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 497f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4985d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 499b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 5005d4f98a2SYan Zheng BTRFS_UUID_SIZE); 501f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 502f46b5a66SChristoph Hellwig 5038ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 5048ea05e3aSAlexander Block 505f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5063cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5073cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5083cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 509707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 5103cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 511f46b5a66SChristoph Hellwig 5123cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5133cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5143cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 51508fe4db1SLi Zefan 516f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 51784234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 518f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 519f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 52086b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 52180ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 522f46b5a66SChristoph Hellwig 5238ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5248ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5258ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5268ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5273cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5283cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5298ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5308ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5318ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 532f46b5a66SChristoph Hellwig 533925baeddSChris Mason btrfs_tree_unlock(leaf); 534f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 535f46b5a66SChristoph Hellwig leaf = NULL; 536f46b5a66SChristoph Hellwig 537f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 538f46b5a66SChristoph Hellwig 539f46b5a66SChristoph Hellwig key.objectid = objectid; 5405d4f98a2SYan Zheng key.offset = 0; 541962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 542f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 543f46b5a66SChristoph Hellwig &root_item); 544f46b5a66SChristoph Hellwig if (ret) 545f46b5a66SChristoph Hellwig goto fail; 546f46b5a66SChristoph Hellwig 54776dda93cSYan, Zheng key.offset = (u64)-1; 54876dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 54979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 55079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 55179787eaaSJeff Mahoney ret = PTR_ERR(new_root); 55279787eaaSJeff Mahoney goto fail; 55379787eaaSJeff Mahoney } 55476dda93cSYan, Zheng 55576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 55676dda93cSYan, Zheng 55763541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 558ce598979SMark Fasheh if (ret) { 559ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 56079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 561ce598979SMark Fasheh goto fail; 562ce598979SMark Fasheh } 563ce598979SMark Fasheh 564f46b5a66SChristoph Hellwig /* 565f46b5a66SChristoph Hellwig * insert the directory item 566f46b5a66SChristoph Hellwig */ 5673de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 56879787eaaSJeff Mahoney if (ret) { 56979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 57079787eaaSJeff Mahoney goto fail; 57179787eaaSJeff Mahoney } 5723de4586cSChris Mason 5733de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 57416cdcec7SMiao Xie name, namelen, dir, &key, 5753de4586cSChris Mason BTRFS_FT_DIR, index); 57679787eaaSJeff Mahoney if (ret) { 57779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 578f46b5a66SChristoph Hellwig goto fail; 57979787eaaSJeff Mahoney } 5800660b5afSChris Mason 58152c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 58252c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 58352c26179SYan Zheng BUG_ON(ret); 58452c26179SYan Zheng 5850660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5864df27c4dSYan, Zheng objectid, root->root_key.objectid, 58733345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5880660b5afSChris Mason BUG_ON(ret); 5890660b5afSChris Mason 590dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 591dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 592dd5f9615SStefan Behrens objectid); 593dd5f9615SStefan Behrens if (ret) 594dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 595dd5f9615SStefan Behrens 596f46b5a66SChristoph Hellwig fail: 597d5c12070SMiao Xie trans->block_rsv = NULL; 598d5c12070SMiao Xie trans->bytes_reserved = 0; 599de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 600de6e8200SLiu Bo 60172fd032eSSage Weil if (async_transid) { 60272fd032eSSage Weil *async_transid = trans->transid; 60372fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 60400d71c9cSMiao Xie if (err) 60500d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 60672fd032eSSage Weil } else { 60776dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 60872fd032eSSage Weil } 609f46b5a66SChristoph Hellwig if (err && !ret) 610f46b5a66SChristoph Hellwig ret = err; 6111a65e24bSChris Mason 6125662344bSTsutomu Itoh if (!ret) { 6135662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 614de6e8200SLiu Bo if (IS_ERR(inode)) 615de6e8200SLiu Bo return PTR_ERR(inode); 6165662344bSTsutomu Itoh d_instantiate(dentry, inode); 6175662344bSTsutomu Itoh } 618f46b5a66SChristoph Hellwig return ret; 619f46b5a66SChristoph Hellwig } 620f46b5a66SChristoph Hellwig 6218257b2dcSMiao Xie static void btrfs_wait_nocow_write(struct btrfs_root *root) 6228257b2dcSMiao Xie { 6238257b2dcSMiao Xie s64 writers; 6248257b2dcSMiao Xie DEFINE_WAIT(wait); 6258257b2dcSMiao Xie 6268257b2dcSMiao Xie do { 6278257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6288257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6298257b2dcSMiao Xie 6308257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6318257b2dcSMiao Xie if (writers) 6328257b2dcSMiao Xie schedule(); 6338257b2dcSMiao Xie 6348257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6358257b2dcSMiao Xie } while (writers); 6368257b2dcSMiao Xie } 6378257b2dcSMiao Xie 638e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 639e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 640e9662f70SMiao Xie u64 *async_transid, bool readonly, 641e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 642f46b5a66SChristoph Hellwig { 6432e4bfab9SYan, Zheng struct inode *inode; 644f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 645f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6462e4bfab9SYan, Zheng int ret; 647f46b5a66SChristoph Hellwig 64827cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 649f46b5a66SChristoph Hellwig return -EINVAL; 650f46b5a66SChristoph Hellwig 6518257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6524e857c58SPeter Zijlstra smp_mb__after_atomic(); 6538257b2dcSMiao Xie btrfs_wait_nocow_write(root); 6548257b2dcSMiao Xie 6556a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6566a03843dSMiao Xie if (ret) 6578257b2dcSMiao Xie goto out; 6586a03843dSMiao Xie 659b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6606a03843dSMiao Xie 661a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 6628257b2dcSMiao Xie if (!pending_snapshot) { 6638257b2dcSMiao Xie ret = -ENOMEM; 6648257b2dcSMiao Xie goto out; 6658257b2dcSMiao Xie } 666a22285a6SYan, Zheng 66766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 66866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 669d5c12070SMiao Xie /* 670d5c12070SMiao Xie * 1 - parent dir inode 671d5c12070SMiao Xie * 2 - dir entries 672d5c12070SMiao Xie * 1 - root item 673d5c12070SMiao Xie * 2 - root ref/backref 674d5c12070SMiao Xie * 1 - root of snapshot 675dd5f9615SStefan Behrens * 1 - UUID item 676d5c12070SMiao Xie */ 677d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 678dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 679ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 680ee3441b4SJeff Mahoney false); 681d5c12070SMiao Xie if (ret) 6828257b2dcSMiao Xie goto free; 683d5c12070SMiao Xie 684a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 685a22285a6SYan, Zheng pending_snapshot->root = root; 686b83cc969SLi Zefan pending_snapshot->readonly = readonly; 687e9662f70SMiao Xie pending_snapshot->dir = dir; 6888696c533SMiao Xie pending_snapshot->inherit = inherit; 689a22285a6SYan, Zheng 690d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 691a22285a6SYan, Zheng if (IS_ERR(trans)) { 692a22285a6SYan, Zheng ret = PTR_ERR(trans); 693a22285a6SYan, Zheng goto fail; 694a22285a6SYan, Zheng } 695a22285a6SYan, Zheng 6968351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 697a22285a6SYan, Zheng list_add(&pending_snapshot->list, 698a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6998351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 70072fd032eSSage Weil if (async_transid) { 70172fd032eSSage Weil *async_transid = trans->transid; 70272fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 70372fd032eSSage Weil root->fs_info->extent_root, 1); 70400d71c9cSMiao Xie if (ret) 70500d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 70672fd032eSSage Weil } else { 70772fd032eSSage Weil ret = btrfs_commit_transaction(trans, 70872fd032eSSage Weil root->fs_info->extent_root); 70972fd032eSSage Weil } 710aec8030aSMiao Xie if (ret) 711c37b2b62SJosef Bacik goto fail; 712a22285a6SYan, Zheng 713a22285a6SYan, Zheng ret = pending_snapshot->error; 714f46b5a66SChristoph Hellwig if (ret) 7152e4bfab9SYan, Zheng goto fail; 716f46b5a66SChristoph Hellwig 7172fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 7182e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7192e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7202e4bfab9SYan, Zheng goto fail; 7212e4bfab9SYan, Zheng } 7225662344bSTsutomu Itoh 7232e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7242e4bfab9SYan, Zheng ret = 0; 7252e4bfab9SYan, Zheng fail: 726d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 727d5c12070SMiao Xie &pending_snapshot->block_rsv, 728d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 7298257b2dcSMiao Xie free: 730a22285a6SYan, Zheng kfree(pending_snapshot); 7318257b2dcSMiao Xie out: 7328257b2dcSMiao Xie atomic_dec(&root->will_be_snapshoted); 733f46b5a66SChristoph Hellwig return ret; 734f46b5a66SChristoph Hellwig } 735f46b5a66SChristoph Hellwig 7364260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 7374260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 7384260f7c7SSage Weil * minimal. 7394260f7c7SSage Weil */ 7404260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 7414260f7c7SSage Weil { 7422f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 7434260f7c7SSage Weil 7444260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 7454260f7c7SSage Weil return 0; 7462f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 7474260f7c7SSage Weil return 0; 7482f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 7494260f7c7SSage Weil return 0; 7504260f7c7SSage Weil return !capable(CAP_FOWNER); 7514260f7c7SSage Weil } 7524260f7c7SSage Weil 7534260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7544260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7554260f7c7SSage Weil * whether the type of victim is right. 7564260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7574260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7584260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7594260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7604260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7614260f7c7SSage Weil * a. be owner of dir, or 7624260f7c7SSage Weil * b. be owner of victim, or 7634260f7c7SSage Weil * c. have CAP_FOWNER capability 7644260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7654260f7c7SSage Weil * links pointing to it. 7664260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7674260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7684260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7694260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7704260f7c7SSage Weil * nfs_async_unlink(). 7714260f7c7SSage Weil */ 7724260f7c7SSage Weil 7734260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7744260f7c7SSage Weil { 7754260f7c7SSage Weil int error; 7764260f7c7SSage Weil 7774260f7c7SSage Weil if (!victim->d_inode) 7784260f7c7SSage Weil return -ENOENT; 7794260f7c7SSage Weil 7804260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7814fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7824260f7c7SSage Weil 7834260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7844260f7c7SSage Weil if (error) 7854260f7c7SSage Weil return error; 7864260f7c7SSage Weil if (IS_APPEND(dir)) 7874260f7c7SSage Weil return -EPERM; 7884260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7894260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7904260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7914260f7c7SSage Weil return -EPERM; 7924260f7c7SSage Weil if (isdir) { 7934260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7944260f7c7SSage Weil return -ENOTDIR; 7954260f7c7SSage Weil if (IS_ROOT(victim)) 7964260f7c7SSage Weil return -EBUSY; 7974260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7984260f7c7SSage Weil return -EISDIR; 7994260f7c7SSage Weil if (IS_DEADDIR(dir)) 8004260f7c7SSage Weil return -ENOENT; 8014260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8024260f7c7SSage Weil return -EBUSY; 8034260f7c7SSage Weil return 0; 8044260f7c7SSage Weil } 8054260f7c7SSage Weil 806cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 807cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 808cb8e7090SChristoph Hellwig { 809cb8e7090SChristoph Hellwig if (child->d_inode) 810cb8e7090SChristoph Hellwig return -EEXIST; 811cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 812cb8e7090SChristoph Hellwig return -ENOENT; 813cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 814cb8e7090SChristoph Hellwig } 815cb8e7090SChristoph Hellwig 816cb8e7090SChristoph Hellwig /* 817cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 818cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 819cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 820cb8e7090SChristoph Hellwig */ 82176dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 82276dda93cSYan, Zheng char *name, int namelen, 82372fd032eSSage Weil struct btrfs_root *snap_src, 8246f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8258696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 826cb8e7090SChristoph Hellwig { 82776dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 828cb8e7090SChristoph Hellwig struct dentry *dentry; 829cb8e7090SChristoph Hellwig int error; 830cb8e7090SChristoph Hellwig 8315c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8325c50c9b8SDavid Sterba if (error == -EINTR) 8335c50c9b8SDavid Sterba return error; 834cb8e7090SChristoph Hellwig 835cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 836cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 837cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 838cb8e7090SChristoph Hellwig goto out_unlock; 839cb8e7090SChristoph Hellwig 840cb8e7090SChristoph Hellwig error = -EEXIST; 841cb8e7090SChristoph Hellwig if (dentry->d_inode) 842cb8e7090SChristoph Hellwig goto out_dput; 843cb8e7090SChristoph Hellwig 84476dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 845cb8e7090SChristoph Hellwig if (error) 846a874a63eSLiu Bo goto out_dput; 847cb8e7090SChristoph Hellwig 8489c52057cSChris Mason /* 8499c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8509c52057cSChris Mason * check for them now when we can safely fail 8519c52057cSChris Mason */ 8529c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8539c52057cSChris Mason dir->i_ino, name, 8549c52057cSChris Mason namelen); 8559c52057cSChris Mason if (error) 8569c52057cSChris Mason goto out_dput; 8579c52057cSChris Mason 85876dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 85976dda93cSYan, Zheng 86076dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 86176dda93cSYan, Zheng goto out_up_read; 86276dda93cSYan, Zheng 8633de4586cSChris Mason if (snap_src) { 864e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8656f72c7e2SArne Jansen async_transid, readonly, inherit); 8663de4586cSChris Mason } else { 867d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 868d5c12070SMiao Xie async_transid, inherit); 8693de4586cSChris Mason } 87076dda93cSYan, Zheng if (!error) 87176dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 87276dda93cSYan, Zheng out_up_read: 87376dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 874cb8e7090SChristoph Hellwig out_dput: 875cb8e7090SChristoph Hellwig dput(dentry); 876cb8e7090SChristoph Hellwig out_unlock: 87776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 878cb8e7090SChristoph Hellwig return error; 879cb8e7090SChristoph Hellwig } 880cb8e7090SChristoph Hellwig 8814cb5300bSChris Mason /* 8824cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8834cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8844cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8854cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8864cb5300bSChris Mason * part of the file 8874cb5300bSChris Mason */ 8884cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8894cb5300bSChris Mason { 8904cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8914cb5300bSChris Mason struct extent_map *em = NULL; 8924cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8934cb5300bSChris Mason u64 end; 8944cb5300bSChris Mason 8954cb5300bSChris Mason read_lock(&em_tree->lock); 8964cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8974cb5300bSChris Mason read_unlock(&em_tree->lock); 8984cb5300bSChris Mason 8994cb5300bSChris Mason if (em) { 9004cb5300bSChris Mason end = extent_map_end(em); 9014cb5300bSChris Mason free_extent_map(em); 9024cb5300bSChris Mason if (end - offset > thresh) 9034cb5300bSChris Mason return 0; 9044cb5300bSChris Mason } 9054cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9064cb5300bSChris Mason thresh /= 2; 9074cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9084cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9094cb5300bSChris Mason if (end >= thresh) 9104cb5300bSChris Mason return 0; 9114cb5300bSChris Mason return 1; 9124cb5300bSChris Mason } 9134cb5300bSChris Mason 9144cb5300bSChris Mason /* 9154cb5300bSChris Mason * helper function to walk through a file and find extents 9164cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9174cb5300bSChris Mason * 9184cb5300bSChris Mason * This is used by the defragging code to find new and small 9194cb5300bSChris Mason * extents 9204cb5300bSChris Mason */ 9214cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9224cb5300bSChris Mason struct inode *inode, u64 newer_than, 9234cb5300bSChris Mason u64 *off, int thresh) 9244cb5300bSChris Mason { 9254cb5300bSChris Mason struct btrfs_path *path; 9264cb5300bSChris Mason struct btrfs_key min_key; 9274cb5300bSChris Mason struct extent_buffer *leaf; 9284cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9294cb5300bSChris Mason int type; 9304cb5300bSChris Mason int ret; 931a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9324cb5300bSChris Mason 9334cb5300bSChris Mason path = btrfs_alloc_path(); 9344cb5300bSChris Mason if (!path) 9354cb5300bSChris Mason return -ENOMEM; 9364cb5300bSChris Mason 937a4689d2bSDavid Sterba min_key.objectid = ino; 9384cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9394cb5300bSChris Mason min_key.offset = *off; 9404cb5300bSChris Mason 9414cb5300bSChris Mason while (1) { 9426174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9434cb5300bSChris Mason if (ret != 0) 9444cb5300bSChris Mason goto none; 945f094c9bdSFilipe Manana process_slot: 946a4689d2bSDavid Sterba if (min_key.objectid != ino) 9474cb5300bSChris Mason goto none; 9484cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9494cb5300bSChris Mason goto none; 9504cb5300bSChris Mason 9514cb5300bSChris Mason leaf = path->nodes[0]; 9524cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9534cb5300bSChris Mason struct btrfs_file_extent_item); 9544cb5300bSChris Mason 9554cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9564cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9574cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9584cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9594cb5300bSChris Mason *off = min_key.offset; 9604cb5300bSChris Mason btrfs_free_path(path); 9614cb5300bSChris Mason return 0; 9624cb5300bSChris Mason } 9634cb5300bSChris Mason 964f094c9bdSFilipe Manana path->slots[0]++; 965f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 966f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 967f094c9bdSFilipe Manana goto process_slot; 968f094c9bdSFilipe Manana } 969f094c9bdSFilipe Manana 9704cb5300bSChris Mason if (min_key.offset == (u64)-1) 9714cb5300bSChris Mason goto none; 9724cb5300bSChris Mason 9734cb5300bSChris Mason min_key.offset++; 9744cb5300bSChris Mason btrfs_release_path(path); 9754cb5300bSChris Mason } 9764cb5300bSChris Mason none: 9774cb5300bSChris Mason btrfs_free_path(path); 9784cb5300bSChris Mason return -ENOENT; 9794cb5300bSChris Mason } 9804cb5300bSChris Mason 9816c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98217ce6ef8SLiu Bo { 98317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 984940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9856c282eb4SLi Zefan struct extent_map *em; 9866c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 987940100a4SChris Mason 988940100a4SChris Mason /* 989940100a4SChris Mason * hopefully we have this extent in the tree already, try without 990940100a4SChris Mason * the full extent lock 991940100a4SChris Mason */ 992940100a4SChris Mason read_lock(&em_tree->lock); 993940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 994940100a4SChris Mason read_unlock(&em_tree->lock); 995940100a4SChris Mason 996940100a4SChris Mason if (!em) { 997308d9800SFilipe Manana struct extent_state *cached = NULL; 998308d9800SFilipe Manana u64 end = start + len - 1; 999308d9800SFilipe Manana 1000940100a4SChris Mason /* get the big lock and read metadata off disk */ 1001308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 1002940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1003308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1004940100a4SChris Mason 10056cf8bfbfSDan Carpenter if (IS_ERR(em)) 10066c282eb4SLi Zefan return NULL; 1007940100a4SChris Mason } 1008940100a4SChris Mason 10096c282eb4SLi Zefan return em; 10106c282eb4SLi Zefan } 10116c282eb4SLi Zefan 10126c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10136c282eb4SLi Zefan { 10146c282eb4SLi Zefan struct extent_map *next; 10156c282eb4SLi Zefan bool ret = true; 10166c282eb4SLi Zefan 10176c282eb4SLi Zefan /* this is the last extent */ 10186c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10196c282eb4SLi Zefan return false; 10206c282eb4SLi Zefan 10216c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1022e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1023e9512d72SChris Mason ret = false; 1024e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1025e9512d72SChris Mason (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) 10266c282eb4SLi Zefan ret = false; 10276c282eb4SLi Zefan 10286c282eb4SLi Zefan free_extent_map(next); 10296c282eb4SLi Zefan return ret; 10306c282eb4SLi Zefan } 10316c282eb4SLi Zefan 10326c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 1033a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1034a43a2111SAndrew Mahone int compress) 10356c282eb4SLi Zefan { 10366c282eb4SLi Zefan struct extent_map *em; 10376c282eb4SLi Zefan int ret = 1; 10386c282eb4SLi Zefan bool next_mergeable = true; 10396c282eb4SLi Zefan 10406c282eb4SLi Zefan /* 10416c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10426c282eb4SLi Zefan * defragging it 10436c282eb4SLi Zefan */ 10446c282eb4SLi Zefan if (start < *defrag_end) 10456c282eb4SLi Zefan return 1; 10466c282eb4SLi Zefan 10476c282eb4SLi Zefan *skip = 0; 10486c282eb4SLi Zefan 10496c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10506c282eb4SLi Zefan if (!em) 10516c282eb4SLi Zefan return 0; 10526c282eb4SLi Zefan 1053940100a4SChris Mason /* this will cover holes, and inline extents */ 105417ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1055940100a4SChris Mason ret = 0; 105617ce6ef8SLiu Bo goto out; 105717ce6ef8SLiu Bo } 105817ce6ef8SLiu Bo 10596c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1060940100a4SChris Mason /* 10616c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10626c282eb4SLi Zefan * real extent, don't bother defragging it 1063940100a4SChris Mason */ 1064a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10656c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1066940100a4SChris Mason ret = 0; 106717ce6ef8SLiu Bo out: 1068940100a4SChris Mason /* 1069940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1070940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1071940100a4SChris Mason * so that the next tiny extent will force a defrag. 1072940100a4SChris Mason * 1073940100a4SChris Mason * The end result of this is that tiny extents before a single big 1074940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1075940100a4SChris Mason */ 1076940100a4SChris Mason if (ret) { 1077940100a4SChris Mason *defrag_end = extent_map_end(em); 1078940100a4SChris Mason } else { 1079940100a4SChris Mason *last_len = 0; 1080940100a4SChris Mason *skip = extent_map_end(em); 1081940100a4SChris Mason *defrag_end = 0; 1082940100a4SChris Mason } 1083940100a4SChris Mason 1084940100a4SChris Mason free_extent_map(em); 1085940100a4SChris Mason return ret; 1086940100a4SChris Mason } 1087940100a4SChris Mason 10884cb5300bSChris Mason /* 10894cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10904cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10914cb5300bSChris Mason * to COW and defrag. 10924cb5300bSChris Mason * 10934cb5300bSChris Mason * It also makes sure the delalloc code has enough 10944cb5300bSChris Mason * dirty data to avoid making new small extents as part 10954cb5300bSChris Mason * of the defrag 10964cb5300bSChris Mason * 10974cb5300bSChris Mason * It's a good idea to start RA on this range 10984cb5300bSChris Mason * before calling this. 10994cb5300bSChris Mason */ 11004cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11014cb5300bSChris Mason struct page **pages, 11024cb5300bSChris Mason unsigned long start_index, 1103c41570c9SJustin Maggard unsigned long num_pages) 1104f46b5a66SChristoph Hellwig { 11054cb5300bSChris Mason unsigned long file_end; 11064cb5300bSChris Mason u64 isize = i_size_read(inode); 1107f46b5a66SChristoph Hellwig u64 page_start; 1108f46b5a66SChristoph Hellwig u64 page_end; 11091f12bd06SLiu Bo u64 page_cnt; 11104cb5300bSChris Mason int ret; 11114cb5300bSChris Mason int i; 11124cb5300bSChris Mason int i_done; 11134cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11144cb5300bSChris Mason struct extent_state *cached_state = NULL; 1115600a45e1SMiao Xie struct extent_io_tree *tree; 11163b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11174cb5300bSChris Mason 11184cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11191f12bd06SLiu Bo if (!isize || start_index > file_end) 11201f12bd06SLiu Bo return 0; 11211f12bd06SLiu Bo 11221f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11234cb5300bSChris Mason 11244cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 11251f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11264cb5300bSChris Mason if (ret) 11274cb5300bSChris Mason return ret; 11284cb5300bSChris Mason i_done = 0; 1129600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11304cb5300bSChris Mason 11314cb5300bSChris Mason /* step one, lock all the pages */ 11321f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11334cb5300bSChris Mason struct page *page; 1134600a45e1SMiao Xie again: 1135a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11363b16a4e3SJosef Bacik start_index + i, mask); 11374cb5300bSChris Mason if (!page) 11384cb5300bSChris Mason break; 11394cb5300bSChris Mason 1140600a45e1SMiao Xie page_start = page_offset(page); 1141600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1142600a45e1SMiao Xie while (1) { 1143308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1144308d9800SFilipe Manana 0, &cached_state); 1145600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1146600a45e1SMiao Xie page_start); 1147308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1148308d9800SFilipe Manana &cached_state, GFP_NOFS); 1149600a45e1SMiao Xie if (!ordered) 1150600a45e1SMiao Xie break; 1151600a45e1SMiao Xie 1152600a45e1SMiao Xie unlock_page(page); 1153600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1154600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1155600a45e1SMiao Xie lock_page(page); 11561f12bd06SLiu Bo /* 11571f12bd06SLiu Bo * we unlocked the page above, so we need check if 11581f12bd06SLiu Bo * it was released or not. 11591f12bd06SLiu Bo */ 11601f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11611f12bd06SLiu Bo unlock_page(page); 11621f12bd06SLiu Bo page_cache_release(page); 11631f12bd06SLiu Bo goto again; 11641f12bd06SLiu Bo } 1165600a45e1SMiao Xie } 1166600a45e1SMiao Xie 11674cb5300bSChris Mason if (!PageUptodate(page)) { 11684cb5300bSChris Mason btrfs_readpage(NULL, page); 11694cb5300bSChris Mason lock_page(page); 11704cb5300bSChris Mason if (!PageUptodate(page)) { 11714cb5300bSChris Mason unlock_page(page); 11724cb5300bSChris Mason page_cache_release(page); 11734cb5300bSChris Mason ret = -EIO; 11744cb5300bSChris Mason break; 11754cb5300bSChris Mason } 11764cb5300bSChris Mason } 1177600a45e1SMiao Xie 1178600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1179600a45e1SMiao Xie unlock_page(page); 1180600a45e1SMiao Xie page_cache_release(page); 1181600a45e1SMiao Xie goto again; 1182600a45e1SMiao Xie } 1183600a45e1SMiao Xie 11844cb5300bSChris Mason pages[i] = page; 11854cb5300bSChris Mason i_done++; 11864cb5300bSChris Mason } 11874cb5300bSChris Mason if (!i_done || ret) 11884cb5300bSChris Mason goto out; 11894cb5300bSChris Mason 11904cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11914cb5300bSChris Mason goto out; 11924cb5300bSChris Mason 11934cb5300bSChris Mason /* 11944cb5300bSChris Mason * so now we have a nice long stream of locked 11954cb5300bSChris Mason * and up to date pages, lets wait on them 11964cb5300bSChris Mason */ 11974cb5300bSChris Mason for (i = 0; i < i_done; i++) 11984cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11994cb5300bSChris Mason 12004cb5300bSChris Mason page_start = page_offset(pages[0]); 12014cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12024cb5300bSChris Mason 12034cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1204d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 12054cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12064cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12079e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12089e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12094cb5300bSChris Mason 12101f12bd06SLiu Bo if (i_done != page_cnt) { 12119e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12129e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12139e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12144cb5300bSChris Mason btrfs_delalloc_release_space(inode, 12151f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12164cb5300bSChris Mason } 12174cb5300bSChris Mason 12184cb5300bSChris Mason 12199e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12209e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12214cb5300bSChris Mason 12224cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12234cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12244cb5300bSChris Mason GFP_NOFS); 12254cb5300bSChris Mason 12264cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12274cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12284cb5300bSChris Mason ClearPageChecked(pages[i]); 12294cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12304cb5300bSChris Mason set_page_dirty(pages[i]); 12314cb5300bSChris Mason unlock_page(pages[i]); 12324cb5300bSChris Mason page_cache_release(pages[i]); 12334cb5300bSChris Mason } 12344cb5300bSChris Mason return i_done; 12354cb5300bSChris Mason out: 12364cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12374cb5300bSChris Mason unlock_page(pages[i]); 12384cb5300bSChris Mason page_cache_release(pages[i]); 12394cb5300bSChris Mason } 12401f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12414cb5300bSChris Mason return ret; 12424cb5300bSChris Mason 12434cb5300bSChris Mason } 12444cb5300bSChris Mason 12454cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12464cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12474cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12484cb5300bSChris Mason { 12494cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12504cb5300bSChris Mason struct file_ra_state *ra = NULL; 12514cb5300bSChris Mason unsigned long last_index; 1252151a31b2SLi Zefan u64 isize = i_size_read(inode); 1253940100a4SChris Mason u64 last_len = 0; 1254940100a4SChris Mason u64 skip = 0; 1255940100a4SChris Mason u64 defrag_end = 0; 12564cb5300bSChris Mason u64 newer_off = range->start; 1257f46b5a66SChristoph Hellwig unsigned long i; 1258008873eaSLi Zefan unsigned long ra_index = 0; 1259f46b5a66SChristoph Hellwig int ret; 12604cb5300bSChris Mason int defrag_count = 0; 12611a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 12624cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1263c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1264c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12654cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12664cb5300bSChris Mason struct page **pages = NULL; 12674cb5300bSChris Mason 12680abd5b17SLiu Bo if (isize == 0) 12690abd5b17SLiu Bo return 0; 12700abd5b17SLiu Bo 12710abd5b17SLiu Bo if (range->start >= isize) 12720abd5b17SLiu Bo return -EINVAL; 12731a419d85SLi Zefan 12741a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12751a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12761a419d85SLi Zefan return -EINVAL; 12771a419d85SLi Zefan if (range->compress_type) 12781a419d85SLi Zefan compress_type = range->compress_type; 12791a419d85SLi Zefan } 1280f46b5a66SChristoph Hellwig 12810abd5b17SLiu Bo if (extent_thresh == 0) 12820abd5b17SLiu Bo extent_thresh = 256 * 1024; 1283f46b5a66SChristoph Hellwig 12844cb5300bSChris Mason /* 12854cb5300bSChris Mason * if we were not given a file, allocate a readahead 12864cb5300bSChris Mason * context 12874cb5300bSChris Mason */ 12884cb5300bSChris Mason if (!file) { 12894cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12904cb5300bSChris Mason if (!ra) 12914cb5300bSChris Mason return -ENOMEM; 12924cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12934cb5300bSChris Mason } else { 12944cb5300bSChris Mason ra = &file->f_ra; 12954cb5300bSChris Mason } 12964cb5300bSChris Mason 1297d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12984cb5300bSChris Mason GFP_NOFS); 12994cb5300bSChris Mason if (!pages) { 13004cb5300bSChris Mason ret = -ENOMEM; 13014cb5300bSChris Mason goto out_ra; 13024cb5300bSChris Mason } 13034cb5300bSChris Mason 13044cb5300bSChris Mason /* find the last page to defrag */ 13051e701a32SChris Mason if (range->start + range->len > range->start) { 1306151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13071e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13081e701a32SChris Mason } else { 1309151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13101e701a32SChris Mason } 13111e701a32SChris Mason 13124cb5300bSChris Mason if (newer_than) { 13134cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13144cb5300bSChris Mason &newer_off, 64 * 1024); 13154cb5300bSChris Mason if (!ret) { 13164cb5300bSChris Mason range->start = newer_off; 13174cb5300bSChris Mason /* 13184cb5300bSChris Mason * we always align our defrag to help keep 13194cb5300bSChris Mason * the extents in the file evenly spaced 13204cb5300bSChris Mason */ 13214cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13224cb5300bSChris Mason } else 13234cb5300bSChris Mason goto out_ra; 13244cb5300bSChris Mason } else { 13251e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13264cb5300bSChris Mason } 13274cb5300bSChris Mason if (!max_to_defrag) 13287ec31b54SLiu Bo max_to_defrag = last_index + 1; 13294cb5300bSChris Mason 13302a0f7f57SLi Zefan /* 13312a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13322a0f7f57SLi Zefan * written sequentially. 13332a0f7f57SLi Zefan */ 13342a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13352a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13362a0f7f57SLi Zefan 1337f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1338ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13394cb5300bSChris Mason /* 13404cb5300bSChris Mason * make sure we stop running if someone unmounts 13414cb5300bSChris Mason * the FS 13424cb5300bSChris Mason */ 13434cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13444cb5300bSChris Mason break; 13454cb5300bSChris Mason 1346210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1347efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1348210549ebSDavid Sterba ret = -EAGAIN; 1349210549ebSDavid Sterba break; 1350210549ebSDavid Sterba } 1351210549ebSDavid Sterba 135266c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13536c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1354a43a2111SAndrew Mahone &defrag_end, range->flags & 1355a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1356940100a4SChris Mason unsigned long next; 1357940100a4SChris Mason /* 1358940100a4SChris Mason * the should_defrag function tells us how much to skip 1359940100a4SChris Mason * bump our counter by the suggested amount 1360940100a4SChris Mason */ 1361ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1362940100a4SChris Mason i = max(i + 1, next); 1363940100a4SChris Mason continue; 1364940100a4SChris Mason } 1365008873eaSLi Zefan 1366008873eaSLi Zefan if (!newer_than) { 1367008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1368008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1369008873eaSLi Zefan cluster = min(cluster, max_cluster); 1370008873eaSLi Zefan } else { 1371008873eaSLi Zefan cluster = max_cluster; 1372008873eaSLi Zefan } 1373008873eaSLi Zefan 1374008873eaSLi Zefan if (i + cluster > ra_index) { 1375008873eaSLi Zefan ra_index = max(i, ra_index); 1376008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1377008873eaSLi Zefan cluster); 1378008873eaSLi Zefan ra_index += max_cluster; 1379008873eaSLi Zefan } 13804cb5300bSChris Mason 1381ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1382633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1383633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1384008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1385ecb8bea8SLiu Bo if (ret < 0) { 1386ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13874cb5300bSChris Mason goto out_ra; 1388ecb8bea8SLiu Bo } 13894cb5300bSChris Mason 13904cb5300bSChris Mason defrag_count += ret; 1391d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1392ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13934cb5300bSChris Mason 13944cb5300bSChris Mason if (newer_than) { 13954cb5300bSChris Mason if (newer_off == (u64)-1) 13964cb5300bSChris Mason break; 13974cb5300bSChris Mason 1398e1f041e1SLiu Bo if (ret > 0) 1399e1f041e1SLiu Bo i += ret; 1400e1f041e1SLiu Bo 14014cb5300bSChris Mason newer_off = max(newer_off + 1, 14024cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14034cb5300bSChris Mason 14044cb5300bSChris Mason ret = find_new_extents(root, inode, 14054cb5300bSChris Mason newer_than, &newer_off, 14064cb5300bSChris Mason 64 * 1024); 14074cb5300bSChris Mason if (!ret) { 14084cb5300bSChris Mason range->start = newer_off; 14094cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14104cb5300bSChris Mason } else { 14114cb5300bSChris Mason break; 1412940100a4SChris Mason } 14134cb5300bSChris Mason } else { 1414008873eaSLi Zefan if (ret > 0) { 1415cbcc8326SLi Zefan i += ret; 1416008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1417008873eaSLi Zefan } else { 1418940100a4SChris Mason i++; 1419008873eaSLi Zefan last_len = 0; 1420008873eaSLi Zefan } 1421f46b5a66SChristoph Hellwig } 14224cb5300bSChris Mason } 1423f46b5a66SChristoph Hellwig 1424dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14251e701a32SChris Mason filemap_flush(inode->i_mapping); 1426dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1427dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1428dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1429dec8ef90SFilipe Manana } 14301e701a32SChris Mason 14311e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14321e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14331e701a32SChris Mason * we have to make sure the IO is actually started and that 14341e701a32SChris Mason * ordered extents get created before we return 14351e701a32SChris Mason */ 14361e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14371e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14381e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14391e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14401e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14411e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14421e701a32SChris Mason } 14431e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14441e701a32SChris Mason } 14451e701a32SChris Mason 14461a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14472b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14481a419d85SLi Zefan } 14491a419d85SLi Zefan 145060ccf82fSDiego Calleja ret = defrag_count; 1451940100a4SChris Mason 14524cb5300bSChris Mason out_ra: 1453633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1454633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1455633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1456633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1457633085c7SFilipe David Borba Manana } 14584cb5300bSChris Mason if (!file) 14594cb5300bSChris Mason kfree(ra); 14604cb5300bSChris Mason kfree(pages); 1461940100a4SChris Mason return ret; 1462f46b5a66SChristoph Hellwig } 1463f46b5a66SChristoph Hellwig 1464198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 146576dda93cSYan, Zheng void __user *arg) 1466f46b5a66SChristoph Hellwig { 1467f46b5a66SChristoph Hellwig u64 new_size; 1468f46b5a66SChristoph Hellwig u64 old_size; 1469f46b5a66SChristoph Hellwig u64 devid = 1; 1470496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1471f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1472f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1473f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1474f46b5a66SChristoph Hellwig char *sizestr; 14759a40f122SGui Hecheng char *retptr; 1476f46b5a66SChristoph Hellwig char *devstr = NULL; 1477f46b5a66SChristoph Hellwig int ret = 0; 1478f46b5a66SChristoph Hellwig int mod = 0; 1479f46b5a66SChristoph Hellwig 1480e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1481e441d54dSChris Mason return -EPERM; 1482e441d54dSChris Mason 1483198605a8SMiao Xie ret = mnt_want_write_file(file); 1484198605a8SMiao Xie if (ret) 1485198605a8SMiao Xie return ret; 1486198605a8SMiao Xie 14875ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14885ac00addSStefan Behrens 1)) { 148997547676SMiao Xie mnt_drop_write_file(file); 1490e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1491c9e9f97bSIlya Dryomov } 1492c9e9f97bSIlya Dryomov 14935ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1494dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1495c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1496c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1497c9e9f97bSIlya Dryomov goto out; 1498c9e9f97bSIlya Dryomov } 14995516e595SMark Fasheh 15005516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1501f46b5a66SChristoph Hellwig 1502f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1503f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1504f46b5a66SChristoph Hellwig if (devstr) { 1505f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1506f46b5a66SChristoph Hellwig *devstr = '\0'; 1507f46b5a66SChristoph Hellwig devstr = vol_args->name; 150858dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 150958dfae63SZhangZhen if (ret) 151058dfae63SZhangZhen goto out_free; 1511dfd79829SMiao Xie if (!devid) { 1512dfd79829SMiao Xie ret = -EINVAL; 1513dfd79829SMiao Xie goto out_free; 1514dfd79829SMiao Xie } 1515efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1516f46b5a66SChristoph Hellwig } 1517dba60f3fSMiao Xie 1518aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1519f46b5a66SChristoph Hellwig if (!device) { 1520efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1521c1c9ff7cSGeert Uytterhoeven devid); 1522dfd79829SMiao Xie ret = -ENODEV; 1523c9e9f97bSIlya Dryomov goto out_free; 1524f46b5a66SChristoph Hellwig } 1525dba60f3fSMiao Xie 1526dba60f3fSMiao Xie if (!device->writeable) { 1527efe120a0SFrank Holton btrfs_info(root->fs_info, 1528efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1529c1c9ff7cSGeert Uytterhoeven devid); 1530dfd79829SMiao Xie ret = -EPERM; 15314e42ae1bSLiu Bo goto out_free; 15324e42ae1bSLiu Bo } 15334e42ae1bSLiu Bo 1534f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1535f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1536f46b5a66SChristoph Hellwig else { 1537f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1538f46b5a66SChristoph Hellwig mod = -1; 1539f46b5a66SChristoph Hellwig sizestr++; 1540f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1541f46b5a66SChristoph Hellwig mod = 1; 1542f46b5a66SChristoph Hellwig sizestr++; 1543f46b5a66SChristoph Hellwig } 15449a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15459a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1546f46b5a66SChristoph Hellwig ret = -EINVAL; 1547c9e9f97bSIlya Dryomov goto out_free; 1548f46b5a66SChristoph Hellwig } 1549f46b5a66SChristoph Hellwig } 1550f46b5a66SChristoph Hellwig 155163a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1552dfd79829SMiao Xie ret = -EPERM; 155363a212abSStefan Behrens goto out_free; 155463a212abSStefan Behrens } 155563a212abSStefan Behrens 15567cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1557f46b5a66SChristoph Hellwig 1558f46b5a66SChristoph Hellwig if (mod < 0) { 1559f46b5a66SChristoph Hellwig if (new_size > old_size) { 1560f46b5a66SChristoph Hellwig ret = -EINVAL; 1561c9e9f97bSIlya Dryomov goto out_free; 1562f46b5a66SChristoph Hellwig } 1563f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1564f46b5a66SChristoph Hellwig } else if (mod > 0) { 1565eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1566902c68a4SGui Hecheng ret = -ERANGE; 1567eb8052e0SWenliang Fan goto out_free; 1568eb8052e0SWenliang Fan } 1569f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1570f46b5a66SChristoph Hellwig } 1571f46b5a66SChristoph Hellwig 1572f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1573f46b5a66SChristoph Hellwig ret = -EINVAL; 1574c9e9f97bSIlya Dryomov goto out_free; 1575f46b5a66SChristoph Hellwig } 1576f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1577f46b5a66SChristoph Hellwig ret = -EFBIG; 1578c9e9f97bSIlya Dryomov goto out_free; 1579f46b5a66SChristoph Hellwig } 1580f46b5a66SChristoph Hellwig 1581f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1582f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1583f46b5a66SChristoph Hellwig 1584efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1585c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1586f46b5a66SChristoph Hellwig 1587f46b5a66SChristoph Hellwig if (new_size > old_size) { 1588a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 158998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 159098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1591c9e9f97bSIlya Dryomov goto out_free; 159298d5dc13STsutomu Itoh } 1593f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1594f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1595ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1596f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15970253f40eSjeff.liu } /* equal, nothing need to do */ 1598f46b5a66SChristoph Hellwig 1599c9e9f97bSIlya Dryomov out_free: 1600f46b5a66SChristoph Hellwig kfree(vol_args); 1601c9e9f97bSIlya Dryomov out: 1602c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16035ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 160418f39c41SIlya Dryomov mnt_drop_write_file(file); 1605f46b5a66SChristoph Hellwig return ret; 1606f46b5a66SChristoph Hellwig } 1607f46b5a66SChristoph Hellwig 160872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16096f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16106f72c7e2SArne Jansen u64 *transid, bool readonly, 16118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1612f46b5a66SChristoph Hellwig { 1613f46b5a66SChristoph Hellwig int namelen; 16143de4586cSChris Mason int ret = 0; 1615f46b5a66SChristoph Hellwig 1616a874a63eSLiu Bo ret = mnt_want_write_file(file); 1617a874a63eSLiu Bo if (ret) 1618a874a63eSLiu Bo goto out; 1619a874a63eSLiu Bo 162072fd032eSSage Weil namelen = strlen(name); 162172fd032eSSage Weil if (strchr(name, '/')) { 1622f46b5a66SChristoph Hellwig ret = -EINVAL; 1623a874a63eSLiu Bo goto out_drop_write; 1624f46b5a66SChristoph Hellwig } 1625f46b5a66SChristoph Hellwig 162616780cabSChris Mason if (name[0] == '.' && 162716780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 162816780cabSChris Mason ret = -EEXIST; 1629a874a63eSLiu Bo goto out_drop_write; 163016780cabSChris Mason } 163116780cabSChris Mason 16323de4586cSChris Mason if (subvol) { 163372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16346f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1635cb8e7090SChristoph Hellwig } else { 16362903ff01SAl Viro struct fd src = fdget(fd); 16373de4586cSChris Mason struct inode *src_inode; 16382903ff01SAl Viro if (!src.file) { 16393de4586cSChris Mason ret = -EINVAL; 1640a874a63eSLiu Bo goto out_drop_write; 16413de4586cSChris Mason } 16423de4586cSChris Mason 1643496ad9aaSAl Viro src_inode = file_inode(src.file); 1644496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1645efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1646efe120a0SFrank Holton "Snapshot src from another FS"); 164723ad5b17SKusanagi Kouichi ret = -EXDEV; 1648d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1649d0242061SDavid Sterba /* 1650d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1651d0242061SDavid Sterba * are limited to own subvolumes only 1652d0242061SDavid Sterba */ 1653d0242061SDavid Sterba ret = -EPERM; 1654ecd18815SAl Viro } else { 165572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 165672fd032eSSage Weil BTRFS_I(src_inode)->root, 16576f72c7e2SArne Jansen transid, readonly, inherit); 1658ecd18815SAl Viro } 16592903ff01SAl Viro fdput(src); 1660cb8e7090SChristoph Hellwig } 1661a874a63eSLiu Bo out_drop_write: 1662a874a63eSLiu Bo mnt_drop_write_file(file); 1663f46b5a66SChristoph Hellwig out: 166472fd032eSSage Weil return ret; 166572fd032eSSage Weil } 166672fd032eSSage Weil 166772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1668fa0d2b9bSLi Zefan void __user *arg, int subvol) 166972fd032eSSage Weil { 1670fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 167172fd032eSSage Weil int ret; 167272fd032eSSage Weil 1673fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1674fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1675fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1676fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1677fa0d2b9bSLi Zefan 1678fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1679b83cc969SLi Zefan vol_args->fd, subvol, 16806f72c7e2SArne Jansen NULL, false, NULL); 1681fa0d2b9bSLi Zefan 1682fa0d2b9bSLi Zefan kfree(vol_args); 1683fa0d2b9bSLi Zefan return ret; 1684fa0d2b9bSLi Zefan } 1685fa0d2b9bSLi Zefan 1686fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1687fa0d2b9bSLi Zefan void __user *arg, int subvol) 1688fa0d2b9bSLi Zefan { 1689fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1690fa0d2b9bSLi Zefan int ret; 1691fdfb1e4fSLi Zefan u64 transid = 0; 1692fdfb1e4fSLi Zefan u64 *ptr = NULL; 1693b83cc969SLi Zefan bool readonly = false; 16946f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 169572fd032eSSage Weil 1696fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1697fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1698fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1699fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1700fdfb1e4fSLi Zefan 1701b83cc969SLi Zefan if (vol_args->flags & 17026f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17036f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1704b83cc969SLi Zefan ret = -EOPNOTSUPP; 1705c47ca32dSDan Carpenter goto free_args; 1706fdfb1e4fSLi Zefan } 1707fdfb1e4fSLi Zefan 1708fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1709fdfb1e4fSLi Zefan ptr = &transid; 1710b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1711b83cc969SLi Zefan readonly = true; 17126f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17136f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17146f72c7e2SArne Jansen ret = -EINVAL; 1715c47ca32dSDan Carpenter goto free_args; 17166f72c7e2SArne Jansen } 17176f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17186f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17196f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1720c47ca32dSDan Carpenter goto free_args; 17216f72c7e2SArne Jansen } 17226f72c7e2SArne Jansen } 172375eaa0e2SSage Weil 1724fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17256f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17268696c533SMiao Xie readonly, inherit); 1727c47ca32dSDan Carpenter if (ret) 1728c47ca32dSDan Carpenter goto free_inherit; 172975eaa0e2SSage Weil 1730c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1731fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1732c47ca32dSDan Carpenter transid), 1733c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 173475eaa0e2SSage Weil ret = -EFAULT; 1735c47ca32dSDan Carpenter 1736c47ca32dSDan Carpenter free_inherit: 17376f72c7e2SArne Jansen kfree(inherit); 1738c47ca32dSDan Carpenter free_args: 1739c47ca32dSDan Carpenter kfree(vol_args); 1740f46b5a66SChristoph Hellwig return ret; 1741f46b5a66SChristoph Hellwig } 1742f46b5a66SChristoph Hellwig 17430caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17440caa102dSLi Zefan void __user *arg) 17450caa102dSLi Zefan { 1746496ad9aaSAl Viro struct inode *inode = file_inode(file); 17470caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17480caa102dSLi Zefan int ret = 0; 17490caa102dSLi Zefan u64 flags = 0; 17500caa102dSLi Zefan 175133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17520caa102dSLi Zefan return -EINVAL; 17530caa102dSLi Zefan 17540caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17550caa102dSLi Zefan if (btrfs_root_readonly(root)) 17560caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17570caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17580caa102dSLi Zefan 17590caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17600caa102dSLi Zefan ret = -EFAULT; 17610caa102dSLi Zefan 17620caa102dSLi Zefan return ret; 17630caa102dSLi Zefan } 17640caa102dSLi Zefan 17650caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17660caa102dSLi Zefan void __user *arg) 17670caa102dSLi Zefan { 1768496ad9aaSAl Viro struct inode *inode = file_inode(file); 17690caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17700caa102dSLi Zefan struct btrfs_trans_handle *trans; 17710caa102dSLi Zefan u64 root_flags; 17720caa102dSLi Zefan u64 flags; 17730caa102dSLi Zefan int ret = 0; 17740caa102dSLi Zefan 1775bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1776bd60ea0fSDavid Sterba return -EPERM; 1777bd60ea0fSDavid Sterba 1778b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1779b9ca0664SLiu Bo if (ret) 1780b9ca0664SLiu Bo goto out; 17810caa102dSLi Zefan 1782b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1783b9ca0664SLiu Bo ret = -EINVAL; 1784b9ca0664SLiu Bo goto out_drop_write; 1785b9ca0664SLiu Bo } 17860caa102dSLi Zefan 1787b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1788b9ca0664SLiu Bo ret = -EFAULT; 1789b9ca0664SLiu Bo goto out_drop_write; 1790b9ca0664SLiu Bo } 17910caa102dSLi Zefan 1792b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1793b9ca0664SLiu Bo ret = -EINVAL; 1794b9ca0664SLiu Bo goto out_drop_write; 1795b9ca0664SLiu Bo } 17960caa102dSLi Zefan 1797b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1798b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1799b9ca0664SLiu Bo goto out_drop_write; 1800b9ca0664SLiu Bo } 18010caa102dSLi Zefan 18020caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 18030caa102dSLi Zefan 18040caa102dSLi Zefan /* nothing to do */ 18050caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1806b9ca0664SLiu Bo goto out_drop_sem; 18070caa102dSLi Zefan 18080caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18092c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18100caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18110caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18122c686537SDavid Sterba } else { 18132c686537SDavid Sterba /* 18142c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18152c686537SDavid Sterba * send 18162c686537SDavid Sterba */ 18172c686537SDavid Sterba spin_lock(&root->root_item_lock); 18182c686537SDavid Sterba if (root->send_in_progress == 0) { 18190caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18200caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18212c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18222c686537SDavid Sterba } else { 18232c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18242c686537SDavid Sterba btrfs_warn(root->fs_info, 18252c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18262c686537SDavid Sterba root->root_key.objectid); 18272c686537SDavid Sterba ret = -EPERM; 18282c686537SDavid Sterba goto out_drop_sem; 18292c686537SDavid Sterba } 18302c686537SDavid Sterba } 18310caa102dSLi Zefan 18320caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18330caa102dSLi Zefan if (IS_ERR(trans)) { 18340caa102dSLi Zefan ret = PTR_ERR(trans); 18350caa102dSLi Zefan goto out_reset; 18360caa102dSLi Zefan } 18370caa102dSLi Zefan 1838b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18390caa102dSLi Zefan &root->root_key, &root->root_item); 18400caa102dSLi Zefan 18410caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18420caa102dSLi Zefan out_reset: 18430caa102dSLi Zefan if (ret) 18440caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1845b9ca0664SLiu Bo out_drop_sem: 18460caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1847b9ca0664SLiu Bo out_drop_write: 1848b9ca0664SLiu Bo mnt_drop_write_file(file); 1849b9ca0664SLiu Bo out: 18500caa102dSLi Zefan return ret; 18510caa102dSLi Zefan } 18520caa102dSLi Zefan 185376dda93cSYan, Zheng /* 185476dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 185576dda93cSYan, Zheng */ 185676dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 185776dda93cSYan, Zheng { 185876dda93cSYan, Zheng struct btrfs_path *path; 1859175a2b87SJosef Bacik struct btrfs_dir_item *di; 186076dda93cSYan, Zheng struct btrfs_key key; 1861175a2b87SJosef Bacik u64 dir_id; 186276dda93cSYan, Zheng int ret; 186376dda93cSYan, Zheng 186476dda93cSYan, Zheng path = btrfs_alloc_path(); 186576dda93cSYan, Zheng if (!path) 186676dda93cSYan, Zheng return -ENOMEM; 186776dda93cSYan, Zheng 1868175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1869175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1870175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1871175a2b87SJosef Bacik dir_id, "default", 7, 0); 1872175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1873175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1874175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 187572de6b53SGuangyu Sun ret = -EPERM; 187672de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 187772de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1878175a2b87SJosef Bacik goto out; 1879175a2b87SJosef Bacik } 1880175a2b87SJosef Bacik btrfs_release_path(path); 1881175a2b87SJosef Bacik } 1882175a2b87SJosef Bacik 188376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 188476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 188576dda93cSYan, Zheng key.offset = (u64)-1; 188676dda93cSYan, Zheng 188776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 188876dda93cSYan, Zheng &key, path, 0, 0); 188976dda93cSYan, Zheng if (ret < 0) 189076dda93cSYan, Zheng goto out; 189176dda93cSYan, Zheng BUG_ON(ret == 0); 189276dda93cSYan, Zheng 189376dda93cSYan, Zheng ret = 0; 189476dda93cSYan, Zheng if (path->slots[0] > 0) { 189576dda93cSYan, Zheng path->slots[0]--; 189676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 189776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 189876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 189976dda93cSYan, Zheng ret = -ENOTEMPTY; 190076dda93cSYan, Zheng } 190176dda93cSYan, Zheng out: 190276dda93cSYan, Zheng btrfs_free_path(path); 190376dda93cSYan, Zheng return ret; 190476dda93cSYan, Zheng } 190576dda93cSYan, Zheng 1906ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1907ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1908ac8e9819SChris Mason { 1909abc6e134SChris Mason struct btrfs_key test; 1910abc6e134SChris Mason int ret; 1911abc6e134SChris Mason 1912abc6e134SChris Mason test.objectid = sk->min_objectid; 1913abc6e134SChris Mason test.type = sk->min_type; 1914abc6e134SChris Mason test.offset = sk->min_offset; 1915abc6e134SChris Mason 1916abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1917abc6e134SChris Mason if (ret < 0) 1918ac8e9819SChris Mason return 0; 1919abc6e134SChris Mason 1920abc6e134SChris Mason test.objectid = sk->max_objectid; 1921abc6e134SChris Mason test.type = sk->max_type; 1922abc6e134SChris Mason test.offset = sk->max_offset; 1923abc6e134SChris Mason 1924abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1925abc6e134SChris Mason if (ret > 0) 1926ac8e9819SChris Mason return 0; 1927ac8e9819SChris Mason return 1; 1928ac8e9819SChris Mason } 1929ac8e9819SChris Mason 1930ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1931ac8e9819SChris Mason struct btrfs_path *path, 1932ac8e9819SChris Mason struct btrfs_key *key, 1933ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19349b6e817dSGerhard Heift size_t *buf_size, 1935ba346b35SGerhard Heift char __user *ubuf, 1936ac8e9819SChris Mason unsigned long *sk_offset, 1937ac8e9819SChris Mason int *num_found) 1938ac8e9819SChris Mason { 1939ac8e9819SChris Mason u64 found_transid; 1940ac8e9819SChris Mason struct extent_buffer *leaf; 1941ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1942ac8e9819SChris Mason unsigned long item_off; 1943ac8e9819SChris Mason unsigned long item_len; 1944ac8e9819SChris Mason int nritems; 1945ac8e9819SChris Mason int i; 1946ac8e9819SChris Mason int slot; 1947ac8e9819SChris Mason int ret = 0; 1948ac8e9819SChris Mason 1949ac8e9819SChris Mason leaf = path->nodes[0]; 1950ac8e9819SChris Mason slot = path->slots[0]; 1951ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1952ac8e9819SChris Mason 1953ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1954ac8e9819SChris Mason i = nritems; 1955ac8e9819SChris Mason goto advance_key; 1956ac8e9819SChris Mason } 1957ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1958ac8e9819SChris Mason 1959ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1960ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1961ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1962ac8e9819SChris Mason 196303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 196403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 196503b71c6cSGabriel de Perthuis continue; 196603b71c6cSGabriel de Perthuis 19679b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19688f5f6178SGerhard Heift if (*num_found) { 1969ac8e9819SChris Mason ret = 1; 19708f5f6178SGerhard Heift goto out; 19718f5f6178SGerhard Heift } 19728f5f6178SGerhard Heift 19738f5f6178SGerhard Heift /* 19748f5f6178SGerhard Heift * return one empty item back for v1, which does not 19758f5f6178SGerhard Heift * handle -EOVERFLOW 19768f5f6178SGerhard Heift */ 19778f5f6178SGerhard Heift 19789b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1979ac8e9819SChris Mason item_len = 0; 19808f5f6178SGerhard Heift ret = -EOVERFLOW; 19818f5f6178SGerhard Heift } 1982ac8e9819SChris Mason 19839b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1984ac8e9819SChris Mason ret = 1; 198525c9bc2eSGerhard Heift goto out; 1986ac8e9819SChris Mason } 1987ac8e9819SChris Mason 1988ac8e9819SChris Mason sh.objectid = key->objectid; 1989ac8e9819SChris Mason sh.offset = key->offset; 1990ac8e9819SChris Mason sh.type = key->type; 1991ac8e9819SChris Mason sh.len = item_len; 1992ac8e9819SChris Mason sh.transid = found_transid; 1993ac8e9819SChris Mason 1994ac8e9819SChris Mason /* copy search result header */ 1995ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 1996ba346b35SGerhard Heift ret = -EFAULT; 1997ba346b35SGerhard Heift goto out; 1998ba346b35SGerhard Heift } 1999ba346b35SGerhard Heift 2000ac8e9819SChris Mason *sk_offset += sizeof(sh); 2001ac8e9819SChris Mason 2002ac8e9819SChris Mason if (item_len) { 2003ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2004ac8e9819SChris Mason /* copy the item */ 2005ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2006ba346b35SGerhard Heift item_off, item_len)) { 2007ba346b35SGerhard Heift ret = -EFAULT; 2008ba346b35SGerhard Heift goto out; 2009ba346b35SGerhard Heift } 2010ba346b35SGerhard Heift 2011ac8e9819SChris Mason *sk_offset += item_len; 2012ac8e9819SChris Mason } 2013e2156867SHugo Mills (*num_found)++; 2014ac8e9819SChris Mason 20158f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20168f5f6178SGerhard Heift goto out; 20178f5f6178SGerhard Heift 201825c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 201925c9bc2eSGerhard Heift ret = 1; 202025c9bc2eSGerhard Heift goto out; 202125c9bc2eSGerhard Heift } 2022ac8e9819SChris Mason } 2023ac8e9819SChris Mason advance_key: 2024ac8e9819SChris Mason ret = 0; 2025abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 2026abc6e134SChris Mason key->offset++; 2027abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 2028abc6e134SChris Mason key->offset = 0; 2029abc6e134SChris Mason key->type++; 2030abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 2031abc6e134SChris Mason key->offset = 0; 2032abc6e134SChris Mason key->type = 0; 2033abc6e134SChris Mason key->objectid++; 2034abc6e134SChris Mason } else 2035abc6e134SChris Mason ret = 1; 203625c9bc2eSGerhard Heift out: 2037ba346b35SGerhard Heift /* 2038ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2039ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2040ba346b35SGerhard Heift * * all items were found 2041ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2042ba346b35SGerhard Heift * leaf 2043ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2044ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2045ba346b35SGerhard Heift */ 2046ac8e9819SChris Mason return ret; 2047ac8e9819SChris Mason } 2048ac8e9819SChris Mason 2049ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 205012544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20519b6e817dSGerhard Heift size_t *buf_size, 2052ba346b35SGerhard Heift char __user *ubuf) 2053ac8e9819SChris Mason { 2054ac8e9819SChris Mason struct btrfs_root *root; 2055ac8e9819SChris Mason struct btrfs_key key; 2056ac8e9819SChris Mason struct btrfs_path *path; 2057ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2058ac8e9819SChris Mason int ret; 2059ac8e9819SChris Mason int num_found = 0; 2060ac8e9819SChris Mason unsigned long sk_offset = 0; 2061ac8e9819SChris Mason 20629b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20639b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 206412544442SGerhard Heift return -EOVERFLOW; 20659b6e817dSGerhard Heift } 206612544442SGerhard Heift 2067ac8e9819SChris Mason path = btrfs_alloc_path(); 2068ac8e9819SChris Mason if (!path) 2069ac8e9819SChris Mason return -ENOMEM; 2070ac8e9819SChris Mason 2071ac8e9819SChris Mason if (sk->tree_id == 0) { 2072ac8e9819SChris Mason /* search the root of the inode that was passed */ 2073ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2074ac8e9819SChris Mason } else { 2075ac8e9819SChris Mason key.objectid = sk->tree_id; 2076ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2077ac8e9819SChris Mason key.offset = (u64)-1; 2078ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2079ac8e9819SChris Mason if (IS_ERR(root)) { 2080efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 2081ac8e9819SChris Mason sk->tree_id); 2082ac8e9819SChris Mason btrfs_free_path(path); 2083ac8e9819SChris Mason return -ENOENT; 2084ac8e9819SChris Mason } 2085ac8e9819SChris Mason } 2086ac8e9819SChris Mason 2087ac8e9819SChris Mason key.objectid = sk->min_objectid; 2088ac8e9819SChris Mason key.type = sk->min_type; 2089ac8e9819SChris Mason key.offset = sk->min_offset; 2090ac8e9819SChris Mason 2091ac8e9819SChris Mason while (1) { 20926174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2093ac8e9819SChris Mason if (ret != 0) { 2094ac8e9819SChris Mason if (ret > 0) 2095ac8e9819SChris Mason ret = 0; 2096ac8e9819SChris Mason goto err; 2097ac8e9819SChris Mason } 2098ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2099ac8e9819SChris Mason &sk_offset, &num_found); 2100b3b4aa74SDavid Sterba btrfs_release_path(path); 210125c9bc2eSGerhard Heift if (ret) 2102ac8e9819SChris Mason break; 2103ac8e9819SChris Mason 2104ac8e9819SChris Mason } 21058f5f6178SGerhard Heift if (ret > 0) 2106ac8e9819SChris Mason ret = 0; 2107ac8e9819SChris Mason err: 2108ac8e9819SChris Mason sk->nr_items = num_found; 2109ac8e9819SChris Mason btrfs_free_path(path); 2110ac8e9819SChris Mason return ret; 2111ac8e9819SChris Mason } 2112ac8e9819SChris Mason 2113ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2114ac8e9819SChris Mason void __user *argp) 2115ac8e9819SChris Mason { 2116ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2117ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2118ac8e9819SChris Mason struct inode *inode; 2119ac8e9819SChris Mason int ret; 21209b6e817dSGerhard Heift size_t buf_size; 2121ac8e9819SChris Mason 2122ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2123ac8e9819SChris Mason return -EPERM; 2124ac8e9819SChris Mason 2125ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2126ac8e9819SChris Mason 2127ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2128ba346b35SGerhard Heift return -EFAULT; 2129ba346b35SGerhard Heift 2130ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2131ac8e9819SChris Mason 2132496ad9aaSAl Viro inode = file_inode(file); 2133ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21348f5f6178SGerhard Heift 21358f5f6178SGerhard Heift /* 21368f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21378f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21388f5f6178SGerhard Heift */ 21398f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21408f5f6178SGerhard Heift ret = 0; 21418f5f6178SGerhard Heift 2142ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2143ac8e9819SChris Mason ret = -EFAULT; 2144ac8e9819SChris Mason return ret; 2145ac8e9819SChris Mason } 2146ac8e9819SChris Mason 2147cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2148cc68a8a5SGerhard Heift void __user *argp) 2149cc68a8a5SGerhard Heift { 2150cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2151cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2152cc68a8a5SGerhard Heift struct inode *inode; 2153cc68a8a5SGerhard Heift int ret; 2154cc68a8a5SGerhard Heift size_t buf_size; 2155cc68a8a5SGerhard Heift const size_t buf_limit = 16 * 1024 * 1024; 2156cc68a8a5SGerhard Heift 2157cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2158cc68a8a5SGerhard Heift return -EPERM; 2159cc68a8a5SGerhard Heift 2160cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2161cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2162cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2163cc68a8a5SGerhard Heift return -EFAULT; 2164cc68a8a5SGerhard Heift 2165cc68a8a5SGerhard Heift buf_size = args.buf_size; 2166cc68a8a5SGerhard Heift 2167cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2168cc68a8a5SGerhard Heift return -EOVERFLOW; 2169cc68a8a5SGerhard Heift 2170cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2171cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2172cc68a8a5SGerhard Heift buf_size = buf_limit; 2173cc68a8a5SGerhard Heift 2174cc68a8a5SGerhard Heift inode = file_inode(file); 2175cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2176cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2177cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2178cc68a8a5SGerhard Heift ret = -EFAULT; 2179cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2180cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2181cc68a8a5SGerhard Heift ret = -EFAULT; 2182cc68a8a5SGerhard Heift 218376dda93cSYan, Zheng return ret; 218476dda93cSYan, Zheng } 218576dda93cSYan, Zheng 218698d377a0STARUISI Hiroaki /* 2187ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2188ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 218998d377a0STARUISI Hiroaki */ 219098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 219198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 219298d377a0STARUISI Hiroaki { 219398d377a0STARUISI Hiroaki struct btrfs_root *root; 219498d377a0STARUISI Hiroaki struct btrfs_key key; 2195ac8e9819SChris Mason char *ptr; 219698d377a0STARUISI Hiroaki int ret = -1; 219798d377a0STARUISI Hiroaki int slot; 219898d377a0STARUISI Hiroaki int len; 219998d377a0STARUISI Hiroaki int total_len = 0; 220098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 220198d377a0STARUISI Hiroaki struct extent_buffer *l; 220298d377a0STARUISI Hiroaki struct btrfs_path *path; 220398d377a0STARUISI Hiroaki 220498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 220598d377a0STARUISI Hiroaki name[0]='\0'; 220698d377a0STARUISI Hiroaki return 0; 220798d377a0STARUISI Hiroaki } 220898d377a0STARUISI Hiroaki 220998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 221098d377a0STARUISI Hiroaki if (!path) 221198d377a0STARUISI Hiroaki return -ENOMEM; 221298d377a0STARUISI Hiroaki 2213ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 221498d377a0STARUISI Hiroaki 221598d377a0STARUISI Hiroaki key.objectid = tree_id; 221698d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 221798d377a0STARUISI Hiroaki key.offset = (u64)-1; 221898d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 221998d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2220efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 22218ad6fcabSChris Mason ret = -ENOENT; 22228ad6fcabSChris Mason goto out; 222398d377a0STARUISI Hiroaki } 222498d377a0STARUISI Hiroaki 222598d377a0STARUISI Hiroaki key.objectid = dirid; 222698d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22278ad6fcabSChris Mason key.offset = (u64)-1; 222898d377a0STARUISI Hiroaki 222998d377a0STARUISI Hiroaki while (1) { 223098d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 223198d377a0STARUISI Hiroaki if (ret < 0) 223298d377a0STARUISI Hiroaki goto out; 223318674c6cSFilipe David Borba Manana else if (ret > 0) { 223418674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 223518674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 223618674c6cSFilipe David Borba Manana if (ret < 0) 223718674c6cSFilipe David Borba Manana goto out; 223818674c6cSFilipe David Borba Manana else if (ret > 0) { 2239ac8e9819SChris Mason ret = -ENOENT; 224098d377a0STARUISI Hiroaki goto out; 2241ac8e9819SChris Mason } 224218674c6cSFilipe David Borba Manana } 224318674c6cSFilipe David Borba Manana 224418674c6cSFilipe David Borba Manana l = path->nodes[0]; 224518674c6cSFilipe David Borba Manana slot = path->slots[0]; 224618674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 224798d377a0STARUISI Hiroaki 224898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 224998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 225098d377a0STARUISI Hiroaki ptr -= len + 1; 225198d377a0STARUISI Hiroaki total_len += len + 1; 2252a696cf35SFilipe David Borba Manana if (ptr < name) { 2253a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 225498d377a0STARUISI Hiroaki goto out; 2255a696cf35SFilipe David Borba Manana } 225698d377a0STARUISI Hiroaki 225798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 225898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 225998d377a0STARUISI Hiroaki 226098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 226198d377a0STARUISI Hiroaki break; 226298d377a0STARUISI Hiroaki 2263b3b4aa74SDavid Sterba btrfs_release_path(path); 226498d377a0STARUISI Hiroaki key.objectid = key.offset; 22658ad6fcabSChris Mason key.offset = (u64)-1; 226698d377a0STARUISI Hiroaki dirid = key.objectid; 226798d377a0STARUISI Hiroaki } 226877906a50SLi Zefan memmove(name, ptr, total_len); 226998d377a0STARUISI Hiroaki name[total_len] = '\0'; 227098d377a0STARUISI Hiroaki ret = 0; 227198d377a0STARUISI Hiroaki out: 227298d377a0STARUISI Hiroaki btrfs_free_path(path); 2273ac8e9819SChris Mason return ret; 2274ac8e9819SChris Mason } 2275ac8e9819SChris Mason 2276ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2277ac8e9819SChris Mason void __user *argp) 2278ac8e9819SChris Mason { 2279ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2280ac8e9819SChris Mason struct inode *inode; 2281ac8e9819SChris Mason int ret; 2282ac8e9819SChris Mason 2283ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2284ac8e9819SChris Mason return -EPERM; 2285ac8e9819SChris Mason 22862354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 22872354d08fSJulia Lawall if (IS_ERR(args)) 22882354d08fSJulia Lawall return PTR_ERR(args); 2289c2b96929SDan Carpenter 2290496ad9aaSAl Viro inode = file_inode(file); 2291ac8e9819SChris Mason 22921b53ac4dSChris Mason if (args->treeid == 0) 22931b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 22941b53ac4dSChris Mason 2295ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2296ac8e9819SChris Mason args->treeid, args->objectid, 2297ac8e9819SChris Mason args->name); 2298ac8e9819SChris Mason 2299ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2300ac8e9819SChris Mason ret = -EFAULT; 2301ac8e9819SChris Mason 2302ac8e9819SChris Mason kfree(args); 230398d377a0STARUISI Hiroaki return ret; 230498d377a0STARUISI Hiroaki } 230598d377a0STARUISI Hiroaki 230676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 230776dda93cSYan, Zheng void __user *arg) 230876dda93cSYan, Zheng { 230954563d41SAl Viro struct dentry *parent = file->f_path.dentry; 231076dda93cSYan, Zheng struct dentry *dentry; 231176dda93cSYan, Zheng struct inode *dir = parent->d_inode; 231276dda93cSYan, Zheng struct inode *inode; 231376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 231476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 231576dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 231676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2317c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2318521e0546SDavid Sterba u64 root_flags; 2319c58aaad2SMiao Xie u64 qgroup_reserved; 232076dda93cSYan, Zheng int namelen; 232176dda93cSYan, Zheng int ret; 232276dda93cSYan, Zheng int err = 0; 232376dda93cSYan, Zheng 232476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 232576dda93cSYan, Zheng if (IS_ERR(vol_args)) 232676dda93cSYan, Zheng return PTR_ERR(vol_args); 232776dda93cSYan, Zheng 232876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 232976dda93cSYan, Zheng namelen = strlen(vol_args->name); 233076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 233176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 233276dda93cSYan, Zheng err = -EINVAL; 233376dda93cSYan, Zheng goto out; 233476dda93cSYan, Zheng } 233576dda93cSYan, Zheng 2336a561be71SAl Viro err = mnt_want_write_file(file); 233776dda93cSYan, Zheng if (err) 233876dda93cSYan, Zheng goto out; 233976dda93cSYan, Zheng 2340521e0546SDavid Sterba 23415c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23425c50c9b8SDavid Sterba if (err == -EINTR) 2343e43f998eSDavid Sterba goto out_drop_write; 234476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 234576dda93cSYan, Zheng if (IS_ERR(dentry)) { 234676dda93cSYan, Zheng err = PTR_ERR(dentry); 234776dda93cSYan, Zheng goto out_unlock_dir; 234876dda93cSYan, Zheng } 234976dda93cSYan, Zheng 235076dda93cSYan, Zheng if (!dentry->d_inode) { 235176dda93cSYan, Zheng err = -ENOENT; 235276dda93cSYan, Zheng goto out_dput; 235376dda93cSYan, Zheng } 235476dda93cSYan, Zheng 235576dda93cSYan, Zheng inode = dentry->d_inode; 23564260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23574260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23584260f7c7SSage Weil /* 23594260f7c7SSage Weil * Regular user. Only allow this with a special mount 23604260f7c7SSage Weil * option, when the user has write+exec access to the 23614260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23624260f7c7SSage Weil * allowed. 23634260f7c7SSage Weil * 23644260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23654260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23664260f7c7SSage Weil * otherwise be able to delete. 23674260f7c7SSage Weil * 23684260f7c7SSage Weil * Users who want to delete empty subvols should try 23694260f7c7SSage Weil * rmdir(2). 23704260f7c7SSage Weil */ 23714260f7c7SSage Weil err = -EPERM; 23724260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 23734260f7c7SSage Weil goto out_dput; 23744260f7c7SSage Weil 23754260f7c7SSage Weil /* 23764260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 23774260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 23784260f7c7SSage Weil * must be called on the dentry referencing the root 23794260f7c7SSage Weil * of the subvol, not a random directory contained 23804260f7c7SSage Weil * within it. 23814260f7c7SSage Weil */ 23824260f7c7SSage Weil err = -EINVAL; 23834260f7c7SSage Weil if (root == dest) 23844260f7c7SSage Weil goto out_dput; 23854260f7c7SSage Weil 23864260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 23874260f7c7SSage Weil if (err) 23884260f7c7SSage Weil goto out_dput; 23895c39da5bSMiao Xie } 23904260f7c7SSage Weil 23915c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 23924260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 23934260f7c7SSage Weil if (err) 23944260f7c7SSage Weil goto out_dput; 23954260f7c7SSage Weil 239633345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 239776dda93cSYan, Zheng err = -EINVAL; 239876dda93cSYan, Zheng goto out_dput; 239976dda93cSYan, Zheng } 240076dda93cSYan, Zheng 240176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 2402521e0546SDavid Sterba 2403521e0546SDavid Sterba /* 2404521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2405521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2406521e0546SDavid Sterba * again is not run concurrently. 2407521e0546SDavid Sterba */ 2408521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2409c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2410c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2411c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2412521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2413521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2414521e0546SDavid Sterba } else { 2415521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2416521e0546SDavid Sterba btrfs_warn(root->fs_info, 2417521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2418c55bfa67SFilipe Manana dest->root_key.objectid); 2419521e0546SDavid Sterba err = -EPERM; 2420521e0546SDavid Sterba goto out_dput; 2421521e0546SDavid Sterba } 2422521e0546SDavid Sterba 242376dda93cSYan, Zheng err = d_invalidate(dentry); 242476dda93cSYan, Zheng if (err) 242576dda93cSYan, Zheng goto out_unlock; 242676dda93cSYan, Zheng 242776dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 242876dda93cSYan, Zheng 242976dda93cSYan, Zheng err = may_destroy_subvol(dest); 243076dda93cSYan, Zheng if (err) 243176dda93cSYan, Zheng goto out_up_write; 243276dda93cSYan, Zheng 2433c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2434c58aaad2SMiao Xie /* 2435c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2436c58aaad2SMiao Xie * ref/backref. 2437c58aaad2SMiao Xie */ 2438c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2439ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2440c58aaad2SMiao Xie if (err) 2441c58aaad2SMiao Xie goto out_up_write; 2442c58aaad2SMiao Xie 2443a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2444a22285a6SYan, Zheng if (IS_ERR(trans)) { 2445a22285a6SYan, Zheng err = PTR_ERR(trans); 2446c58aaad2SMiao Xie goto out_release; 2447a22285a6SYan, Zheng } 2448c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2449c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2450a22285a6SYan, Zheng 245176dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 245276dda93cSYan, Zheng dest->root_key.objectid, 245376dda93cSYan, Zheng dentry->d_name.name, 245476dda93cSYan, Zheng dentry->d_name.len); 245579787eaaSJeff Mahoney if (ret) { 245679787eaaSJeff Mahoney err = ret; 245779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 245879787eaaSJeff Mahoney goto out_end_trans; 245979787eaaSJeff Mahoney } 246076dda93cSYan, Zheng 246176dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 246276dda93cSYan, Zheng 246376dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 246476dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 246576dda93cSYan, Zheng dest->root_item.drop_level = 0; 246676dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 246776dda93cSYan, Zheng 246827cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 246976dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 247076dda93cSYan, Zheng root->fs_info->tree_root, 247176dda93cSYan, Zheng dest->root_key.objectid); 247279787eaaSJeff Mahoney if (ret) { 247379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 247479787eaaSJeff Mahoney err = ret; 247579787eaaSJeff Mahoney goto out_end_trans; 2476d68fc57bSYan, Zheng } 247779787eaaSJeff Mahoney } 2478dd5f9615SStefan Behrens 2479dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2480dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2481dd5f9615SStefan Behrens dest->root_key.objectid); 2482dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2483dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2484dd5f9615SStefan Behrens err = ret; 2485dd5f9615SStefan Behrens goto out_end_trans; 2486dd5f9615SStefan Behrens } 2487dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2488dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2489dd5f9615SStefan Behrens dest->root_item.received_uuid, 2490dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2491dd5f9615SStefan Behrens dest->root_key.objectid); 2492dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2493dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2494dd5f9615SStefan Behrens err = ret; 2495dd5f9615SStefan Behrens goto out_end_trans; 2496dd5f9615SStefan Behrens } 2497dd5f9615SStefan Behrens } 2498dd5f9615SStefan Behrens 249979787eaaSJeff Mahoney out_end_trans: 2500c58aaad2SMiao Xie trans->block_rsv = NULL; 2501c58aaad2SMiao Xie trans->bytes_reserved = 0; 2502531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 250379787eaaSJeff Mahoney if (ret && !err) 250479787eaaSJeff Mahoney err = ret; 250576dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2506c58aaad2SMiao Xie out_release: 2507c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 250876dda93cSYan, Zheng out_up_write: 250976dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 251076dda93cSYan, Zheng out_unlock: 2511521e0546SDavid Sterba if (err) { 2512521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2513c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2514c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2515521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2516521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2517521e0546SDavid Sterba } 251876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 251976dda93cSYan, Zheng if (!err) { 2520efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 252176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 252276dda93cSYan, Zheng d_delete(dentry); 252361155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2524fa6ac876SLiu Bo 2525fa6ac876SLiu Bo /* the last ref */ 252657cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 252757cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 252857cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2529fa6ac876SLiu Bo } 253076dda93cSYan, Zheng } 253176dda93cSYan, Zheng out_dput: 253276dda93cSYan, Zheng dput(dentry); 253376dda93cSYan, Zheng out_unlock_dir: 253476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2535e43f998eSDavid Sterba out_drop_write: 25362a79f17eSAl Viro mnt_drop_write_file(file); 253776dda93cSYan, Zheng out: 253876dda93cSYan, Zheng kfree(vol_args); 253976dda93cSYan, Zheng return err; 254076dda93cSYan, Zheng } 254176dda93cSYan, Zheng 25421e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2543f46b5a66SChristoph Hellwig { 2544496ad9aaSAl Viro struct inode *inode = file_inode(file); 2545f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25461e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2547c146afadSYan Zheng int ret; 2548c146afadSYan Zheng 254925122d15SIlya Dryomov ret = mnt_want_write_file(file); 255025122d15SIlya Dryomov if (ret) 255125122d15SIlya Dryomov return ret; 2552b83cc969SLi Zefan 255325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 255425122d15SIlya Dryomov ret = -EROFS; 255525122d15SIlya Dryomov goto out; 25565ac00addSStefan Behrens } 2557f46b5a66SChristoph Hellwig 2558f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2559f46b5a66SChristoph Hellwig case S_IFDIR: 2560e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2561e441d54dSChris Mason ret = -EPERM; 2562e441d54dSChris Mason goto out; 2563e441d54dSChris Mason } 2564de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25658929ecfaSYan, Zheng if (ret) 25668929ecfaSYan, Zheng goto out; 2567de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2568f46b5a66SChristoph Hellwig break; 2569f46b5a66SChristoph Hellwig case S_IFREG: 2570e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2571e441d54dSChris Mason ret = -EINVAL; 2572e441d54dSChris Mason goto out; 2573e441d54dSChris Mason } 25741e701a32SChris Mason 25751e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 25761e701a32SChris Mason if (!range) { 25771e701a32SChris Mason ret = -ENOMEM; 25781e701a32SChris Mason goto out; 25791e701a32SChris Mason } 25801e701a32SChris Mason 25811e701a32SChris Mason if (argp) { 25821e701a32SChris Mason if (copy_from_user(range, argp, 25831e701a32SChris Mason sizeof(*range))) { 25841e701a32SChris Mason ret = -EFAULT; 25851e701a32SChris Mason kfree(range); 2586683be16eSDan Carpenter goto out; 25871e701a32SChris Mason } 25881e701a32SChris Mason /* compression requires us to start the IO */ 25891e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 25901e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 25911e701a32SChris Mason range->extent_thresh = (u32)-1; 25921e701a32SChris Mason } 25931e701a32SChris Mason } else { 25941e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 25951e701a32SChris Mason range->len = (u64)-1; 25961e701a32SChris Mason } 2597496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 25984cb5300bSChris Mason range, 0, 0); 25994cb5300bSChris Mason if (ret > 0) 26004cb5300bSChris Mason ret = 0; 26011e701a32SChris Mason kfree(range); 2602f46b5a66SChristoph Hellwig break; 26038929ecfaSYan, Zheng default: 26048929ecfaSYan, Zheng ret = -EINVAL; 2605f46b5a66SChristoph Hellwig } 2606e441d54dSChris Mason out: 260725122d15SIlya Dryomov mnt_drop_write_file(file); 2608e441d54dSChris Mason return ret; 2609f46b5a66SChristoph Hellwig } 2610f46b5a66SChristoph Hellwig 2611b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2612f46b5a66SChristoph Hellwig { 2613f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2614f46b5a66SChristoph Hellwig int ret; 2615f46b5a66SChristoph Hellwig 2616e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2617e441d54dSChris Mason return -EPERM; 2618e441d54dSChris Mason 26195ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26205ac00addSStefan Behrens 1)) { 2621e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2622c9e9f97bSIlya Dryomov } 2623c9e9f97bSIlya Dryomov 26245ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2625dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2626c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2627c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2628c9e9f97bSIlya Dryomov goto out; 2629c9e9f97bSIlya Dryomov } 2630f46b5a66SChristoph Hellwig 26315516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2632f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2633f46b5a66SChristoph Hellwig 263443d20761SAnand Jain if (!ret) 263543d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 263643d20761SAnand Jain 2637f46b5a66SChristoph Hellwig kfree(vol_args); 2638c9e9f97bSIlya Dryomov out: 2639c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26405ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2641f46b5a66SChristoph Hellwig return ret; 2642f46b5a66SChristoph Hellwig } 2643f46b5a66SChristoph Hellwig 2644da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2645f46b5a66SChristoph Hellwig { 2646496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2647f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2648f46b5a66SChristoph Hellwig int ret; 2649f46b5a66SChristoph Hellwig 2650e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2651e441d54dSChris Mason return -EPERM; 2652e441d54dSChris Mason 2653da24927bSMiao Xie ret = mnt_want_write_file(file); 2654da24927bSMiao Xie if (ret) 2655da24927bSMiao Xie return ret; 2656c146afadSYan Zheng 2657dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2658c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2659c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2660c47ca32dSDan Carpenter goto err_drop; 2661c9e9f97bSIlya Dryomov } 2662f46b5a66SChristoph Hellwig 26635516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2664f46b5a66SChristoph Hellwig 2665183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2666183860f6SAnand Jain 1)) { 2667183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2668183860f6SAnand Jain goto out; 2669183860f6SAnand Jain } 2670183860f6SAnand Jain 2671183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2672183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2673c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26745ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2675183860f6SAnand Jain 2676ec95d491SAnand Jain if (!ret) 2677ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2678ec95d491SAnand Jain 2679183860f6SAnand Jain out: 2680183860f6SAnand Jain kfree(vol_args); 2681c47ca32dSDan Carpenter err_drop: 26824ac20c70SIlya Dryomov mnt_drop_write_file(file); 2683f46b5a66SChristoph Hellwig return ret; 2684f46b5a66SChristoph Hellwig } 2685f46b5a66SChristoph Hellwig 2686475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2687475f6387SJan Schmidt { 2688027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2689475f6387SJan Schmidt struct btrfs_device *device; 2690475f6387SJan Schmidt struct btrfs_device *next; 2691475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2692027ed2f0SLi Zefan int ret = 0; 2693475f6387SJan Schmidt 2694027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2695027ed2f0SLi Zefan if (!fi_args) 2696027ed2f0SLi Zefan return -ENOMEM; 2697027ed2f0SLi Zefan 2698f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2699027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2700027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2701475f6387SJan Schmidt 2702475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2703027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2704027ed2f0SLi Zefan fi_args->max_id = device->devid; 2705475f6387SJan Schmidt } 2706475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2707475f6387SJan Schmidt 270880a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 270980a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 271080a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 271180a773fbSDavid Sterba 2712027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2713027ed2f0SLi Zefan ret = -EFAULT; 2714475f6387SJan Schmidt 2715027ed2f0SLi Zefan kfree(fi_args); 2716027ed2f0SLi Zefan return ret; 2717475f6387SJan Schmidt } 2718475f6387SJan Schmidt 2719475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2720475f6387SJan Schmidt { 2721475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2722475f6387SJan Schmidt struct btrfs_device *dev; 2723475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2724475f6387SJan Schmidt int ret = 0; 2725475f6387SJan Schmidt char *s_uuid = NULL; 2726475f6387SJan Schmidt 2727475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2728475f6387SJan Schmidt if (IS_ERR(di_args)) 2729475f6387SJan Schmidt return PTR_ERR(di_args); 2730475f6387SJan Schmidt 2731dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2732475f6387SJan Schmidt s_uuid = di_args->uuid; 2733475f6387SJan Schmidt 2734475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2735aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2736475f6387SJan Schmidt 2737475f6387SJan Schmidt if (!dev) { 2738475f6387SJan Schmidt ret = -ENODEV; 2739475f6387SJan Schmidt goto out; 2740475f6387SJan Schmidt } 2741475f6387SJan Schmidt 2742475f6387SJan Schmidt di_args->devid = dev->devid; 27437cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27447cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2745475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2746a27202fbSJim Meyering if (dev->name) { 2747606686eeSJosef Bacik struct rcu_string *name; 2748606686eeSJosef Bacik 2749606686eeSJosef Bacik rcu_read_lock(); 2750606686eeSJosef Bacik name = rcu_dereference(dev->name); 2751606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2752606686eeSJosef Bacik rcu_read_unlock(); 2753a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2754a27202fbSJim Meyering } else { 275599ba55adSStefan Behrens di_args->path[0] = '\0'; 2756a27202fbSJim Meyering } 2757475f6387SJan Schmidt 2758475f6387SJan Schmidt out: 275955793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2760475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2761475f6387SJan Schmidt ret = -EFAULT; 2762475f6387SJan Schmidt 2763475f6387SJan Schmidt kfree(di_args); 2764475f6387SJan Schmidt return ret; 2765475f6387SJan Schmidt } 2766475f6387SJan Schmidt 2767416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2768416161dbSMark Fasheh { 2769416161dbSMark Fasheh struct page *page; 2770416161dbSMark Fasheh pgoff_t index; 2771416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2772416161dbSMark Fasheh 2773416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2774416161dbSMark Fasheh 2775416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2776416161dbSMark Fasheh if (!page) 2777416161dbSMark Fasheh return NULL; 2778416161dbSMark Fasheh 2779416161dbSMark Fasheh if (!PageUptodate(page)) { 2780416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2781416161dbSMark Fasheh 0)) 2782416161dbSMark Fasheh return NULL; 2783416161dbSMark Fasheh lock_page(page); 2784416161dbSMark Fasheh if (!PageUptodate(page)) { 2785416161dbSMark Fasheh unlock_page(page); 2786416161dbSMark Fasheh page_cache_release(page); 2787416161dbSMark Fasheh return NULL; 2788416161dbSMark Fasheh } 2789416161dbSMark Fasheh } 2790416161dbSMark Fasheh unlock_page(page); 2791416161dbSMark Fasheh 2792416161dbSMark Fasheh return page; 2793416161dbSMark Fasheh } 2794416161dbSMark Fasheh 279577fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 279677fe20dcSMark Fasheh { 279777fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 279877fe20dcSMark Fasheh another, and lock file content */ 279977fe20dcSMark Fasheh while (1) { 280077fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 280177fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 280277fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 280377fe20dcSMark Fasheh off + len - 1); 2804ff5df9b8SFilipe Manana if ((!ordered || 2805ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2806ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 280777fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2808ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2809ff5df9b8SFilipe Manana if (ordered) 2810ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 281177fe20dcSMark Fasheh break; 2812ff5df9b8SFilipe Manana } 281377fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 281477fe20dcSMark Fasheh if (ordered) 281577fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 281677fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 281777fe20dcSMark Fasheh } 281877fe20dcSMark Fasheh } 281977fe20dcSMark Fasheh 2820416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2821416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2822416161dbSMark Fasheh { 2823416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2824416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2825416161dbSMark Fasheh 2826416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2827416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2828416161dbSMark Fasheh } 2829416161dbSMark Fasheh 2830416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2831416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2832416161dbSMark Fasheh { 2833416161dbSMark Fasheh if (inode1 < inode2) { 2834416161dbSMark Fasheh swap(inode1, inode2); 2835416161dbSMark Fasheh swap(loff1, loff2); 2836416161dbSMark Fasheh } 2837416161dbSMark Fasheh 2838416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2839416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2840416161dbSMark Fasheh if (inode1 != inode2) { 2841416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2842416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2843416161dbSMark Fasheh } 2844416161dbSMark Fasheh } 2845416161dbSMark Fasheh 2846416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2847416161dbSMark Fasheh u64 dst_loff, u64 len) 2848416161dbSMark Fasheh { 2849416161dbSMark Fasheh int ret = 0; 2850416161dbSMark Fasheh struct page *src_page, *dst_page; 2851416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2852416161dbSMark Fasheh void *addr, *dst_addr; 2853416161dbSMark Fasheh 2854416161dbSMark Fasheh while (len) { 2855416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2856416161dbSMark Fasheh cmp_len = len; 2857416161dbSMark Fasheh 2858416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2859416161dbSMark Fasheh if (!src_page) 2860416161dbSMark Fasheh return -EINVAL; 2861416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2862416161dbSMark Fasheh if (!dst_page) { 2863416161dbSMark Fasheh page_cache_release(src_page); 2864416161dbSMark Fasheh return -EINVAL; 2865416161dbSMark Fasheh } 2866416161dbSMark Fasheh addr = kmap_atomic(src_page); 2867416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2868416161dbSMark Fasheh 2869416161dbSMark Fasheh flush_dcache_page(src_page); 2870416161dbSMark Fasheh flush_dcache_page(dst_page); 2871416161dbSMark Fasheh 2872416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2873416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2874416161dbSMark Fasheh 2875416161dbSMark Fasheh kunmap_atomic(addr); 2876416161dbSMark Fasheh kunmap_atomic(dst_addr); 2877416161dbSMark Fasheh page_cache_release(src_page); 2878416161dbSMark Fasheh page_cache_release(dst_page); 2879416161dbSMark Fasheh 2880416161dbSMark Fasheh if (ret) 2881416161dbSMark Fasheh break; 2882416161dbSMark Fasheh 2883416161dbSMark Fasheh loff += cmp_len; 2884416161dbSMark Fasheh dst_loff += cmp_len; 2885416161dbSMark Fasheh len -= cmp_len; 2886416161dbSMark Fasheh } 2887416161dbSMark Fasheh 2888416161dbSMark Fasheh return ret; 2889416161dbSMark Fasheh } 2890416161dbSMark Fasheh 2891416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2892416161dbSMark Fasheh { 2893416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2894416161dbSMark Fasheh 2895416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2896416161dbSMark Fasheh return -EINVAL; 2897416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2898416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2899416161dbSMark Fasheh return -EINVAL; 2900416161dbSMark Fasheh 2901416161dbSMark Fasheh return 0; 2902416161dbSMark Fasheh } 2903416161dbSMark Fasheh 2904416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2905416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2906416161dbSMark Fasheh { 2907416161dbSMark Fasheh int ret; 2908416161dbSMark Fasheh 2909416161dbSMark Fasheh /* 2910416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2911416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2912416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2913416161dbSMark Fasheh */ 2914416161dbSMark Fasheh if (src == dst) 2915416161dbSMark Fasheh return -EINVAL; 2916416161dbSMark Fasheh 2917416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2918416161dbSMark Fasheh 2919416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2920416161dbSMark Fasheh if (ret) 2921416161dbSMark Fasheh goto out_unlock; 2922416161dbSMark Fasheh 2923416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2924416161dbSMark Fasheh if (ret) 2925416161dbSMark Fasheh goto out_unlock; 2926416161dbSMark Fasheh 2927416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2928416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2929416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2930416161dbSMark Fasheh ret = -EINVAL; 2931416161dbSMark Fasheh goto out_unlock; 2932416161dbSMark Fasheh } 2933416161dbSMark Fasheh 2934416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2935416161dbSMark Fasheh if (ret == 0) 2936416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2937416161dbSMark Fasheh 2938416161dbSMark Fasheh out_unlock: 2939416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2940416161dbSMark Fasheh 2941416161dbSMark Fasheh return ret; 2942416161dbSMark Fasheh } 2943416161dbSMark Fasheh 2944416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2945416161dbSMark Fasheh 2946416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 29471c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 2948416161dbSMark Fasheh { 2949cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2950cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 29511c1c8747SAl Viro struct inode *src = file_inode(file); 2952416161dbSMark Fasheh u64 off; 2953416161dbSMark Fasheh u64 len; 2954416161dbSMark Fasheh int i; 2955416161dbSMark Fasheh int ret; 2956cbf8b8caSMark Fasheh unsigned long size; 2957416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2958416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 29591c1c8747SAl Viro u16 count; 2960416161dbSMark Fasheh 2961416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2962416161dbSMark Fasheh return -EINVAL; 2963416161dbSMark Fasheh 2964416161dbSMark Fasheh ret = mnt_want_write_file(file); 2965416161dbSMark Fasheh if (ret) 2966416161dbSMark Fasheh return ret; 2967416161dbSMark Fasheh 29681c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 2969416161dbSMark Fasheh ret = -EFAULT; 2970416161dbSMark Fasheh goto out; 2971416161dbSMark Fasheh } 2972416161dbSMark Fasheh 29731c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 2974cbf8b8caSMark Fasheh 29751c1c8747SAl Viro same = memdup_user(argp, size); 2976cbf8b8caSMark Fasheh 2977229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2978229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2979cbf8b8caSMark Fasheh goto out; 2980cbf8b8caSMark Fasheh } 2981cbf8b8caSMark Fasheh 2982cbf8b8caSMark Fasheh off = same->logical_offset; 2983cbf8b8caSMark Fasheh len = same->length; 2984416161dbSMark Fasheh 2985416161dbSMark Fasheh /* 2986416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2987416161dbSMark Fasheh * This is intended to bound the total time spent in this 2988416161dbSMark Fasheh * ioctl to something sane. 2989416161dbSMark Fasheh */ 2990416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2991416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2992416161dbSMark Fasheh 2993416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2994416161dbSMark Fasheh /* 2995416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2996416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2997416161dbSMark Fasheh * this situation without an update. 2998416161dbSMark Fasheh */ 2999416161dbSMark Fasheh ret = -EINVAL; 3000416161dbSMark Fasheh goto out; 3001416161dbSMark Fasheh } 3002416161dbSMark Fasheh 3003416161dbSMark Fasheh ret = -EISDIR; 3004416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 3005416161dbSMark Fasheh goto out; 3006416161dbSMark Fasheh 3007416161dbSMark Fasheh ret = -EACCES; 3008416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 3009416161dbSMark Fasheh goto out; 3010416161dbSMark Fasheh 3011cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 30121c1c8747SAl Viro for (i = 0; i < count; i++) { 3013cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 3014cbf8b8caSMark Fasheh same->info[i].status = 0; 3015416161dbSMark Fasheh } 3016416161dbSMark Fasheh 30171c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 30181c1c8747SAl Viro struct inode *dst; 30191c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 30201c1c8747SAl Viro if (!dst_file.file) { 3021cbf8b8caSMark Fasheh info->status = -EBADF; 30221c1c8747SAl Viro continue; 3023416161dbSMark Fasheh } 30241c1c8747SAl Viro dst = file_inode(dst_file.file); 3025416161dbSMark Fasheh 30261c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 3027cbf8b8caSMark Fasheh info->status = -EINVAL; 30281c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 3029cbf8b8caSMark Fasheh info->status = -EXDEV; 30301c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 3031cbf8b8caSMark Fasheh info->status = -EISDIR; 30321c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 3033cbf8b8caSMark Fasheh info->status = -EACCES; 30341c1c8747SAl Viro } else { 3035cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 3036cbf8b8caSMark Fasheh info->logical_offset); 3037cbf8b8caSMark Fasheh if (info->status == 0) 3038cbf8b8caSMark Fasheh info->bytes_deduped += len; 30391c1c8747SAl Viro } 30401c1c8747SAl Viro fdput(dst_file); 3041cbf8b8caSMark Fasheh } 3042416161dbSMark Fasheh 3043cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 3044cbf8b8caSMark Fasheh if (ret) 3045416161dbSMark Fasheh ret = -EFAULT; 3046416161dbSMark Fasheh 3047416161dbSMark Fasheh out: 3048416161dbSMark Fasheh mnt_drop_write_file(file); 3049416161dbSMark Fasheh return ret; 3050416161dbSMark Fasheh } 3051416161dbSMark Fasheh 3052fcebe456SJosef Bacik /* Helper to check and see if this root currently has a ref on the given disk 3053fcebe456SJosef Bacik * bytenr. If it does then we need to update the quota for this root. This 3054fcebe456SJosef Bacik * doesn't do anything if quotas aren't enabled. 3055fcebe456SJosef Bacik */ 3056fcebe456SJosef Bacik static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3057fcebe456SJosef Bacik u64 disko) 3058fcebe456SJosef Bacik { 3059fcebe456SJosef Bacik struct seq_list tree_mod_seq_elem = {}; 3060fcebe456SJosef Bacik struct ulist *roots; 3061fcebe456SJosef Bacik struct ulist_iterator uiter; 3062fcebe456SJosef Bacik struct ulist_node *root_node = NULL; 3063fcebe456SJosef Bacik int ret; 3064fcebe456SJosef Bacik 3065fcebe456SJosef Bacik if (!root->fs_info->quota_enabled) 3066fcebe456SJosef Bacik return 1; 3067fcebe456SJosef Bacik 3068fcebe456SJosef Bacik btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3069fcebe456SJosef Bacik ret = btrfs_find_all_roots(trans, root->fs_info, disko, 3070fcebe456SJosef Bacik tree_mod_seq_elem.seq, &roots); 3071fcebe456SJosef Bacik if (ret < 0) 3072fcebe456SJosef Bacik goto out; 3073fcebe456SJosef Bacik ret = 0; 3074fcebe456SJosef Bacik ULIST_ITER_INIT(&uiter); 3075fcebe456SJosef Bacik while ((root_node = ulist_next(roots, &uiter))) { 3076fcebe456SJosef Bacik if (root_node->val == root->objectid) { 3077fcebe456SJosef Bacik ret = 1; 3078fcebe456SJosef Bacik break; 3079fcebe456SJosef Bacik } 3080fcebe456SJosef Bacik } 3081fcebe456SJosef Bacik ulist_free(roots); 3082fcebe456SJosef Bacik out: 3083fcebe456SJosef Bacik btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3084fcebe456SJosef Bacik return ret; 3085fcebe456SJosef Bacik } 3086fcebe456SJosef Bacik 3087f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3088f82a9901SFilipe Manana struct inode *inode, 3089f82a9901SFilipe Manana u64 endoff, 3090f82a9901SFilipe Manana const u64 destoff, 3091f82a9901SFilipe Manana const u64 olen) 3092f82a9901SFilipe Manana { 3093f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3094f82a9901SFilipe Manana int ret; 3095f82a9901SFilipe Manana 3096f82a9901SFilipe Manana inode_inc_iversion(inode); 3097f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3098f82a9901SFilipe Manana /* 3099f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3100f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3101f82a9901SFilipe Manana */ 3102f82a9901SFilipe Manana if (endoff > destoff + olen) 3103f82a9901SFilipe Manana endoff = destoff + olen; 3104f82a9901SFilipe Manana if (endoff > inode->i_size) 3105f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3106f82a9901SFilipe Manana 3107f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3108f82a9901SFilipe Manana if (ret) { 3109f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3110f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3111f82a9901SFilipe Manana goto out; 3112f82a9901SFilipe Manana } 3113f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3114f82a9901SFilipe Manana out: 3115f82a9901SFilipe Manana return ret; 3116f82a9901SFilipe Manana } 3117f82a9901SFilipe Manana 31187ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 31197ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 31207ffbb598SFilipe Manana const struct btrfs_path *path, 31217ffbb598SFilipe Manana const u64 hole_offset, 31227ffbb598SFilipe Manana const u64 hole_len) 31237ffbb598SFilipe Manana { 31247ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 31257ffbb598SFilipe Manana struct extent_map *em; 31267ffbb598SFilipe Manana int ret; 31277ffbb598SFilipe Manana 31287ffbb598SFilipe Manana em = alloc_extent_map(); 31297ffbb598SFilipe Manana if (!em) { 31307ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31317ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31327ffbb598SFilipe Manana return; 31337ffbb598SFilipe Manana } 31347ffbb598SFilipe Manana 313514f59796SFilipe Manana if (path) { 313614f59796SFilipe Manana struct btrfs_file_extent_item *fi; 313714f59796SFilipe Manana 313814f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 313914f59796SFilipe Manana struct btrfs_file_extent_item); 31407ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 31417ffbb598SFilipe Manana em->generation = -1; 31427ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 31437ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 31447ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31457ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31467ffbb598SFilipe Manana } else { 31477ffbb598SFilipe Manana em->start = hole_offset; 31487ffbb598SFilipe Manana em->len = hole_len; 31497ffbb598SFilipe Manana em->ram_bytes = em->len; 31507ffbb598SFilipe Manana em->orig_start = hole_offset; 31517ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 31527ffbb598SFilipe Manana em->block_len = 0; 31537ffbb598SFilipe Manana em->orig_block_len = 0; 31547ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 31557ffbb598SFilipe Manana em->generation = trans->transid; 31567ffbb598SFilipe Manana } 31577ffbb598SFilipe Manana 31587ffbb598SFilipe Manana while (1) { 31597ffbb598SFilipe Manana write_lock(&em_tree->lock); 31607ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 31617ffbb598SFilipe Manana write_unlock(&em_tree->lock); 31627ffbb598SFilipe Manana if (ret != -EEXIST) { 31637ffbb598SFilipe Manana free_extent_map(em); 31647ffbb598SFilipe Manana break; 31657ffbb598SFilipe Manana } 31667ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 31677ffbb598SFilipe Manana em->start + em->len - 1, 0); 31687ffbb598SFilipe Manana } 31697ffbb598SFilipe Manana 31707ffbb598SFilipe Manana if (unlikely(ret)) 31717ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31727ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31737ffbb598SFilipe Manana } 31747ffbb598SFilipe Manana 317532b7c687SMark Fasheh /** 317632b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 317732b7c687SMark Fasheh * 317832b7c687SMark Fasheh * @src: Inode to clone from 317932b7c687SMark Fasheh * @inode: Inode to clone to 318032b7c687SMark Fasheh * @off: Offset within source to start clone from 318132b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 318232b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 318332b7c687SMark Fasheh * identical values here 318432b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 318532b7c687SMark Fasheh */ 318632b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3187f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 3188f82a9901SFilipe Manana const u64 destoff) 3189f46b5a66SChristoph Hellwig { 3190f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 319132b7c687SMark Fasheh struct btrfs_path *path = NULL; 3192f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 319332b7c687SMark Fasheh struct btrfs_trans_handle *trans; 319432b7c687SMark Fasheh char *buf = NULL; 3195ae01a0abSYan Zheng struct btrfs_key key; 3196f46b5a66SChristoph Hellwig u32 nritems; 3197f46b5a66SChristoph Hellwig int slot; 3198ae01a0abSYan Zheng int ret; 3199fcebe456SJosef Bacik int no_quota; 3200f82a9901SFilipe Manana const u64 len = olen_aligned; 3201fcebe456SJosef Bacik u64 last_disko = 0; 3202f82a9901SFilipe Manana u64 last_dest_end = destoff; 3203ae01a0abSYan Zheng 3204ae01a0abSYan Zheng ret = -ENOMEM; 3205707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3206ae01a0abSYan Zheng if (!buf) 320732b7c687SMark Fasheh return ret; 3208ae01a0abSYan Zheng 3209ae01a0abSYan Zheng path = btrfs_alloc_path(); 3210ae01a0abSYan Zheng if (!path) { 3211ae01a0abSYan Zheng vfree(buf); 321232b7c687SMark Fasheh return ret; 3213ae01a0abSYan Zheng } 321432b7c687SMark Fasheh 3215ae01a0abSYan Zheng path->reada = 2; 3216c5c9cd4dSSage Weil /* clone data */ 321733345d01SLi Zefan key.objectid = btrfs_ino(src); 3218ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 32192c463823SFilipe Manana key.offset = off; 3220f46b5a66SChristoph Hellwig 3221f46b5a66SChristoph Hellwig while (1) { 3222f46b5a66SChristoph Hellwig /* 3223f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3224f46b5a66SChristoph Hellwig * tree. 3225f46b5a66SChristoph Hellwig */ 3226e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3227362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3228362a20c5SDavid Sterba 0, 0); 3229f46b5a66SChristoph Hellwig if (ret < 0) 3230f46b5a66SChristoph Hellwig goto out; 32312c463823SFilipe Manana /* 32322c463823SFilipe Manana * First search, if no extent item that starts at offset off was 32332c463823SFilipe Manana * found but the previous item is an extent item, it's possible 32342c463823SFilipe Manana * it might overlap our target range, therefore process it. 32352c463823SFilipe Manana */ 32362c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 32372c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 32382c463823SFilipe Manana path->slots[0] - 1); 32392c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 32402c463823SFilipe Manana path->slots[0]--; 32412c463823SFilipe Manana } 3242f46b5a66SChristoph Hellwig 3243ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3244e4355f34SFilipe David Borba Manana process_slot: 3245fcebe456SJosef Bacik no_quota = 1; 3246ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3247362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3248f46b5a66SChristoph Hellwig if (ret < 0) 3249f46b5a66SChristoph Hellwig goto out; 3250f46b5a66SChristoph Hellwig if (ret > 0) 3251f46b5a66SChristoph Hellwig break; 3252ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3253f46b5a66SChristoph Hellwig } 3254f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3255f46b5a66SChristoph Hellwig slot = path->slots[0]; 3256f46b5a66SChristoph Hellwig 3257ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3258962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 325933345d01SLi Zefan key.objectid != btrfs_ino(src)) 3260f46b5a66SChristoph Hellwig break; 3261f46b5a66SChristoph Hellwig 3262962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3263c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3264c5c9cd4dSSage Weil int type; 326531840ae1SZheng Yan u32 size; 326631840ae1SZheng Yan struct btrfs_key new_key; 3267c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3268c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3269c5c9cd4dSSage Weil u8 comp; 3270f82a9901SFilipe Manana u64 drop_start; 327131840ae1SZheng Yan 3272c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3273c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3274c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3275c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3276c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3277c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3278d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3279d397712bSChris Mason extent); 3280d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3281d397712bSChris Mason extent); 3282c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3283d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3284d397712bSChris Mason extent); 3285c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3286c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3287c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3288c5c9cd4dSSage Weil extent); 3289c5c9cd4dSSage Weil } 329031840ae1SZheng Yan 32912c463823SFilipe Manana /* 32922c463823SFilipe Manana * The first search might have left us at an extent 32932c463823SFilipe Manana * item that ends before our target range's start, can 32942c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 32952c463823SFilipe Manana */ 32962c463823SFilipe Manana if (key.offset + datal <= off) { 3297e4355f34SFilipe David Borba Manana path->slots[0]++; 3298e4355f34SFilipe David Borba Manana goto process_slot; 32992c463823SFilipe Manana } else if (key.offset >= off + len) { 33002c463823SFilipe Manana break; 3301e4355f34SFilipe David Borba Manana } 3302e4355f34SFilipe David Borba Manana 3303e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3304e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3305e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3306e4355f34SFilipe David Borba Manana size); 3307e4355f34SFilipe David Borba Manana 3308e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3309e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3310c5c9cd4dSSage Weil 331131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 331233345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 33134d728ec7SLi Zefan if (off <= key.offset) 3314c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 33154d728ec7SLi Zefan else 33164d728ec7SLi Zefan new_key.offset = destoff; 3317c5c9cd4dSSage Weil 3318b6f3409bSSage Weil /* 3319f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3320f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3321f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3322f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3323f82a9901SFilipe Manana * partially overlaps it). 3324f82a9901SFilipe Manana */ 3325f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3326f82a9901SFilipe Manana drop_start = last_dest_end; 3327f82a9901SFilipe Manana else 3328f82a9901SFilipe Manana drop_start = new_key.offset; 3329f82a9901SFilipe Manana 3330f82a9901SFilipe Manana /* 3331b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3332b6f3409bSSage Weil * 1 - add new extent 3333b6f3409bSSage Weil * 1 - inode update 3334b6f3409bSSage Weil */ 3335b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3336a22285a6SYan, Zheng if (IS_ERR(trans)) { 3337a22285a6SYan, Zheng ret = PTR_ERR(trans); 3338a22285a6SYan, Zheng goto out; 3339a22285a6SYan, Zheng } 3340a22285a6SYan, Zheng 3341c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3342c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3343d72c0842SLi Zefan /* 3344d72c0842SLi Zefan * a | --- range to clone ---| b 3345d72c0842SLi Zefan * | ------------- extent ------------- | 3346d72c0842SLi Zefan */ 3347d72c0842SLi Zefan 334893915584SAntonio Ospite /* subtract range b */ 3349d72c0842SLi Zefan if (key.offset + datal > off + len) 3350d72c0842SLi Zefan datal = off + len - key.offset; 3351d72c0842SLi Zefan 335293915584SAntonio Ospite /* subtract range a */ 3353a22285a6SYan, Zheng if (off > key.offset) { 3354a22285a6SYan, Zheng datao += off - key.offset; 3355a22285a6SYan, Zheng datal -= off - key.offset; 3356a22285a6SYan, Zheng } 3357a22285a6SYan, Zheng 33585dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3359f82a9901SFilipe Manana drop_start, 3360a22285a6SYan, Zheng new_key.offset + datal, 33612671485dSJosef Bacik 1); 336279787eaaSJeff Mahoney if (ret) { 33633f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 336400fdf13aSLiu Bo btrfs_abort_transaction(trans, 336500fdf13aSLiu Bo root, ret); 336679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 336779787eaaSJeff Mahoney goto out; 336879787eaaSJeff Mahoney } 3369a22285a6SYan, Zheng 337031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 337131840ae1SZheng Yan &new_key, size); 337279787eaaSJeff Mahoney if (ret) { 337379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 337479787eaaSJeff Mahoney ret); 337579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 337679787eaaSJeff Mahoney goto out; 337779787eaaSJeff Mahoney } 337831840ae1SZheng Yan 337931840ae1SZheng Yan leaf = path->nodes[0]; 338031840ae1SZheng Yan slot = path->slots[0]; 338131840ae1SZheng Yan write_extent_buffer(leaf, buf, 338231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 338331840ae1SZheng Yan size); 3384ae01a0abSYan Zheng 3385f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3386f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3387c5c9cd4dSSage Weil 3388c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3389c5c9cd4dSSage Weil if (!disko) 3390c5c9cd4dSSage Weil datao = 0; 3391c5c9cd4dSSage Weil 3392c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3393c5c9cd4dSSage Weil datao); 3394c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3395c5c9cd4dSSage Weil datal); 3396fcebe456SJosef Bacik 3397fcebe456SJosef Bacik /* 3398fcebe456SJosef Bacik * We need to look up the roots that point at 3399fcebe456SJosef Bacik * this bytenr and see if the new root does. If 3400fcebe456SJosef Bacik * it does not we need to make sure we update 3401fcebe456SJosef Bacik * quotas appropriately. 3402fcebe456SJosef Bacik */ 3403fcebe456SJosef Bacik if (disko && root != BTRFS_I(src)->root && 3404fcebe456SJosef Bacik disko != last_disko) { 3405fcebe456SJosef Bacik no_quota = check_ref(trans, root, 3406fcebe456SJosef Bacik disko); 3407fcebe456SJosef Bacik if (no_quota < 0) { 3408fcebe456SJosef Bacik btrfs_abort_transaction(trans, 3409fcebe456SJosef Bacik root, 3410fcebe456SJosef Bacik ret); 3411fcebe456SJosef Bacik btrfs_end_transaction(trans, 3412fcebe456SJosef Bacik root); 3413fcebe456SJosef Bacik ret = no_quota; 3414fcebe456SJosef Bacik goto out; 3415fcebe456SJosef Bacik } 3416fcebe456SJosef Bacik } 3417fcebe456SJosef Bacik 3418c5c9cd4dSSage Weil if (disko) { 3419c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3420ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 34215d4f98a2SYan Zheng disko, diskl, 0, 3422f46b5a66SChristoph Hellwig root->root_key.objectid, 342333345d01SLi Zefan btrfs_ino(inode), 342466d7e7f0SArne Jansen new_key.offset - datao, 3425fcebe456SJosef Bacik no_quota); 342679787eaaSJeff Mahoney if (ret) { 342779787eaaSJeff Mahoney btrfs_abort_transaction(trans, 342879787eaaSJeff Mahoney root, 342979787eaaSJeff Mahoney ret); 343079787eaaSJeff Mahoney btrfs_end_transaction(trans, 343179787eaaSJeff Mahoney root); 343279787eaaSJeff Mahoney goto out; 343379787eaaSJeff Mahoney 343479787eaaSJeff Mahoney } 3435f46b5a66SChristoph Hellwig } 3436c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3437c5c9cd4dSSage Weil u64 skip = 0; 3438c5c9cd4dSSage Weil u64 trim = 0; 3439d3ecfcdfSLiu Bo u64 aligned_end = 0; 3440d3ecfcdfSLiu Bo 3441c5c9cd4dSSage Weil if (off > key.offset) { 3442c5c9cd4dSSage Weil skip = off - key.offset; 3443c5c9cd4dSSage Weil new_key.offset += skip; 344431840ae1SZheng Yan } 3445d397712bSChris Mason 3446c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3447c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3448d397712bSChris Mason 3449c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3450c5c9cd4dSSage Weil ret = -EINVAL; 3451a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3452c5c9cd4dSSage Weil goto out; 345331840ae1SZheng Yan } 3454c5c9cd4dSSage Weil size -= skip + trim; 3455c5c9cd4dSSage Weil datal -= skip + trim; 3456a22285a6SYan, Zheng 3457d3ecfcdfSLiu Bo aligned_end = ALIGN(new_key.offset + datal, 3458d3ecfcdfSLiu Bo root->sectorsize); 34595dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3460f82a9901SFilipe Manana drop_start, 3461d3ecfcdfSLiu Bo aligned_end, 34622671485dSJosef Bacik 1); 346379787eaaSJeff Mahoney if (ret) { 34643f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 34653a29bc09SChris Mason btrfs_abort_transaction(trans, 34663a29bc09SChris Mason root, ret); 346779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 346879787eaaSJeff Mahoney goto out; 346979787eaaSJeff Mahoney } 3470a22285a6SYan, Zheng 3471c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3472c5c9cd4dSSage Weil &new_key, size); 347379787eaaSJeff Mahoney if (ret) { 347479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 347579787eaaSJeff Mahoney ret); 347679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 347779787eaaSJeff Mahoney goto out; 347879787eaaSJeff Mahoney } 3479c5c9cd4dSSage Weil 3480c5c9cd4dSSage Weil if (skip) { 3481d397712bSChris Mason u32 start = 3482d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3483c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3484c5c9cd4dSSage Weil datal); 3485c5c9cd4dSSage Weil } 3486c5c9cd4dSSage Weil 3487c5c9cd4dSSage Weil leaf = path->nodes[0]; 3488c5c9cd4dSSage Weil slot = path->slots[0]; 3489c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3490c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3491c5c9cd4dSSage Weil size); 3492c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3493c5c9cd4dSSage Weil } 3494c5c9cd4dSSage Weil 34957ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 34967ffbb598SFilipe Manana if (drop_start < new_key.offset) 34977ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 349814f59796SFilipe Manana NULL, drop_start, 34997ffbb598SFilipe Manana new_key.offset - drop_start); 35007ffbb598SFilipe Manana 350114f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 35027ffbb598SFilipe Manana 3503c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3504b3b4aa74SDavid Sterba btrfs_release_path(path); 3505c5c9cd4dSSage Weil 350662e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 350762e2390eSFilipe Manana root->sectorsize); 3508f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3509f82a9901SFilipe Manana last_dest_end, 3510f82a9901SFilipe Manana destoff, olen); 3511f82a9901SFilipe Manana if (ret) 351279787eaaSJeff Mahoney goto out; 35132c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 35142c463823SFilipe Manana break; 3515a22285a6SYan, Zheng } 3516b3b4aa74SDavid Sterba btrfs_release_path(path); 3517ae01a0abSYan Zheng key.offset++; 3518ae01a0abSYan Zheng } 3519f46b5a66SChristoph Hellwig ret = 0; 352032b7c687SMark Fasheh 3521f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3522f82a9901SFilipe Manana /* 3523f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3524f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3525f82a9901SFilipe Manana */ 3526b3b4aa74SDavid Sterba btrfs_release_path(path); 3527f82a9901SFilipe Manana 3528f82a9901SFilipe Manana /* 3529f82a9901SFilipe Manana * 1 - remove extent(s) 3530f82a9901SFilipe Manana * 1 - inode update 3531f82a9901SFilipe Manana */ 3532f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3533f82a9901SFilipe Manana if (IS_ERR(trans)) { 3534f82a9901SFilipe Manana ret = PTR_ERR(trans); 3535f82a9901SFilipe Manana goto out; 3536f82a9901SFilipe Manana } 3537f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3538f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3539f82a9901SFilipe Manana if (ret) { 3540f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3541f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3542f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3543f82a9901SFilipe Manana goto out; 3544f82a9901SFilipe Manana } 354514f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 354614f59796SFilipe Manana destoff + len - last_dest_end); 3547f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 3548f82a9901SFilipe Manana destoff, olen); 3549f82a9901SFilipe Manana } 3550f82a9901SFilipe Manana 3551f46b5a66SChristoph Hellwig out: 355232b7c687SMark Fasheh btrfs_free_path(path); 355332b7c687SMark Fasheh vfree(buf); 355432b7c687SMark Fasheh return ret; 355532b7c687SMark Fasheh } 355632b7c687SMark Fasheh 355732b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 355832b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 355932b7c687SMark Fasheh { 356054563d41SAl Viro struct inode *inode = file_inode(file); 356132b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 356232b7c687SMark Fasheh struct fd src_file; 356332b7c687SMark Fasheh struct inode *src; 356432b7c687SMark Fasheh int ret; 356532b7c687SMark Fasheh u64 len = olen; 356632b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 356732b7c687SMark Fasheh int same_inode = 0; 356832b7c687SMark Fasheh 356932b7c687SMark Fasheh /* 357032b7c687SMark Fasheh * TODO: 357132b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 357232b7c687SMark Fasheh * decompress into destination's address_space (the file offset 357332b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 357432b7c687SMark Fasheh * otherwise reinsert) a subrange. 357500fdf13aSLiu Bo * 357600fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 357700fdf13aSLiu Bo * be either compressed or non-compressed. 357832b7c687SMark Fasheh */ 357932b7c687SMark Fasheh 358032b7c687SMark Fasheh /* the destination must be opened for writing */ 358132b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 358232b7c687SMark Fasheh return -EINVAL; 358332b7c687SMark Fasheh 358432b7c687SMark Fasheh if (btrfs_root_readonly(root)) 358532b7c687SMark Fasheh return -EROFS; 358632b7c687SMark Fasheh 358732b7c687SMark Fasheh ret = mnt_want_write_file(file); 358832b7c687SMark Fasheh if (ret) 358932b7c687SMark Fasheh return ret; 359032b7c687SMark Fasheh 359132b7c687SMark Fasheh src_file = fdget(srcfd); 359232b7c687SMark Fasheh if (!src_file.file) { 359332b7c687SMark Fasheh ret = -EBADF; 359432b7c687SMark Fasheh goto out_drop_write; 359532b7c687SMark Fasheh } 359632b7c687SMark Fasheh 359732b7c687SMark Fasheh ret = -EXDEV; 359832b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 359932b7c687SMark Fasheh goto out_fput; 360032b7c687SMark Fasheh 360132b7c687SMark Fasheh src = file_inode(src_file.file); 360232b7c687SMark Fasheh 360332b7c687SMark Fasheh ret = -EINVAL; 360432b7c687SMark Fasheh if (src == inode) 360532b7c687SMark Fasheh same_inode = 1; 360632b7c687SMark Fasheh 360732b7c687SMark Fasheh /* the src must be open for reading */ 360832b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 360932b7c687SMark Fasheh goto out_fput; 361032b7c687SMark Fasheh 361132b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 361232b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 361332b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 361432b7c687SMark Fasheh goto out_fput; 361532b7c687SMark Fasheh 361632b7c687SMark Fasheh ret = -EISDIR; 361732b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 361832b7c687SMark Fasheh goto out_fput; 361932b7c687SMark Fasheh 362032b7c687SMark Fasheh ret = -EXDEV; 362132b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 362232b7c687SMark Fasheh goto out_fput; 362332b7c687SMark Fasheh 362432b7c687SMark Fasheh if (!same_inode) { 362532b7c687SMark Fasheh if (inode < src) { 362632b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 362732b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 362832b7c687SMark Fasheh } else { 362932b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 363032b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 363132b7c687SMark Fasheh } 363232b7c687SMark Fasheh } else { 363332b7c687SMark Fasheh mutex_lock(&src->i_mutex); 363432b7c687SMark Fasheh } 363532b7c687SMark Fasheh 363632b7c687SMark Fasheh /* determine range to clone */ 363732b7c687SMark Fasheh ret = -EINVAL; 363832b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 363932b7c687SMark Fasheh goto out_unlock; 364032b7c687SMark Fasheh if (len == 0) 364132b7c687SMark Fasheh olen = len = src->i_size - off; 364232b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 364332b7c687SMark Fasheh if (off + len == src->i_size) 364432b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 364532b7c687SMark Fasheh 364632b7c687SMark Fasheh /* verify the end result is block aligned */ 364732b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 364832b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 364932b7c687SMark Fasheh goto out_unlock; 365032b7c687SMark Fasheh 365132b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 365232b7c687SMark Fasheh if (same_inode) { 365332b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 365432b7c687SMark Fasheh goto out_unlock; 365532b7c687SMark Fasheh } 365632b7c687SMark Fasheh 365732b7c687SMark Fasheh if (destoff > inode->i_size) { 365832b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 365932b7c687SMark Fasheh if (ret) 366032b7c687SMark Fasheh goto out_unlock; 366132b7c687SMark Fasheh } 366232b7c687SMark Fasheh 3663c125b8bfSFilipe Manana /* 3664c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3665c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3666c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3667c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3668c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3669c125b8bfSFilipe Manana */ 3670c125b8bfSFilipe Manana if (same_inode) { 3671c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3672c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 367332b7c687SMark Fasheh 3674c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3675c125b8bfSFilipe Manana } else { 367632b7c687SMark Fasheh lock_extent_range(src, off, len); 3677c125b8bfSFilipe Manana lock_extent_range(inode, destoff, len); 3678c125b8bfSFilipe Manana } 367932b7c687SMark Fasheh 368032b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 368132b7c687SMark Fasheh 3682c125b8bfSFilipe Manana if (same_inode) { 3683c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3684c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3685c125b8bfSFilipe Manana 3686c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3687c125b8bfSFilipe Manana } else { 3688aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3689c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(inode)->io_tree, destoff, 3690c125b8bfSFilipe Manana destoff + len - 1); 3691c125b8bfSFilipe Manana } 3692c125b8bfSFilipe Manana /* 3693c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3694c125b8bfSFilipe Manana * data immediately and not the previous data. 3695c125b8bfSFilipe Manana */ 3696c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3697c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3698f46b5a66SChristoph Hellwig out_unlock: 3699c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3700c57c2b3eSFilipe David Borba Manana if (inode < src) { 3701f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3702f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3703c57c2b3eSFilipe David Borba Manana } else { 3704c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3705c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3706c57c2b3eSFilipe David Borba Manana } 3707c57c2b3eSFilipe David Borba Manana } else { 3708c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3709c57c2b3eSFilipe David Borba Manana } 3710f46b5a66SChristoph Hellwig out_fput: 37112903ff01SAl Viro fdput(src_file); 3712ab67b7c1SYan Zheng out_drop_write: 37132a79f17eSAl Viro mnt_drop_write_file(file); 3714f46b5a66SChristoph Hellwig return ret; 3715f46b5a66SChristoph Hellwig } 3716f46b5a66SChristoph Hellwig 37177a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3718c5c9cd4dSSage Weil { 3719c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3720c5c9cd4dSSage Weil 37217a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3722c5c9cd4dSSage Weil return -EFAULT; 3723c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3724c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3725c5c9cd4dSSage Weil } 3726c5c9cd4dSSage Weil 3727f46b5a66SChristoph Hellwig /* 3728f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3729f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3730f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3731f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3732f46b5a66SChristoph Hellwig */ 3733b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3734f46b5a66SChristoph Hellwig { 3735496ad9aaSAl Viro struct inode *inode = file_inode(file); 3736f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3737f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 37381ab86aedSSage Weil int ret; 3739f46b5a66SChristoph Hellwig 37401ab86aedSSage Weil ret = -EPERM; 3741df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3742f46b5a66SChristoph Hellwig goto out; 37431ab86aedSSage Weil 37441ab86aedSSage Weil ret = -EINPROGRESS; 37451ab86aedSSage Weil if (file->private_data) 37461ab86aedSSage Weil goto out; 37479ca9ee09SSage Weil 3748b83cc969SLi Zefan ret = -EROFS; 3749b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3750b83cc969SLi Zefan goto out; 3751b83cc969SLi Zefan 3752a561be71SAl Viro ret = mnt_want_write_file(file); 3753c146afadSYan Zheng if (ret) 3754c146afadSYan Zheng goto out; 3755c146afadSYan Zheng 3756a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 37579ca9ee09SSage Weil 3758f46b5a66SChristoph Hellwig ret = -ENOMEM; 37597a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3760abd30bb0STsutomu Itoh if (IS_ERR(trans)) 37611ab86aedSSage Weil goto out_drop; 37621ab86aedSSage Weil 37631ab86aedSSage Weil file->private_data = trans; 37641ab86aedSSage Weil return 0; 37651ab86aedSSage Weil 37661ab86aedSSage Weil out_drop: 3767a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 37682a79f17eSAl Viro mnt_drop_write_file(file); 3769f46b5a66SChristoph Hellwig out: 3770f46b5a66SChristoph Hellwig return ret; 3771f46b5a66SChristoph Hellwig } 3772f46b5a66SChristoph Hellwig 37736ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37746ef5ed0dSJosef Bacik { 3775496ad9aaSAl Viro struct inode *inode = file_inode(file); 37766ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37776ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37786ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37796ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37806ef5ed0dSJosef Bacik struct btrfs_path *path; 37816ef5ed0dSJosef Bacik struct btrfs_key location; 37826ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37836ef5ed0dSJosef Bacik u64 objectid = 0; 37846ef5ed0dSJosef Bacik u64 dir_id; 37853c04ce01SMiao Xie int ret; 37866ef5ed0dSJosef Bacik 37876ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37886ef5ed0dSJosef Bacik return -EPERM; 37896ef5ed0dSJosef Bacik 37903c04ce01SMiao Xie ret = mnt_want_write_file(file); 37913c04ce01SMiao Xie if (ret) 37923c04ce01SMiao Xie return ret; 37933c04ce01SMiao Xie 37943c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37953c04ce01SMiao Xie ret = -EFAULT; 37963c04ce01SMiao Xie goto out; 37973c04ce01SMiao Xie } 37986ef5ed0dSJosef Bacik 37996ef5ed0dSJosef Bacik if (!objectid) 38001cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 38016ef5ed0dSJosef Bacik 38026ef5ed0dSJosef Bacik location.objectid = objectid; 38036ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 38046ef5ed0dSJosef Bacik location.offset = (u64)-1; 38056ef5ed0dSJosef Bacik 38066ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 38073c04ce01SMiao Xie if (IS_ERR(new_root)) { 38083c04ce01SMiao Xie ret = PTR_ERR(new_root); 38093c04ce01SMiao Xie goto out; 38103c04ce01SMiao Xie } 38116ef5ed0dSJosef Bacik 38126ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38133c04ce01SMiao Xie if (!path) { 38143c04ce01SMiao Xie ret = -ENOMEM; 38153c04ce01SMiao Xie goto out; 38163c04ce01SMiao Xie } 38176ef5ed0dSJosef Bacik path->leave_spinning = 1; 38186ef5ed0dSJosef Bacik 38196ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 382098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38216ef5ed0dSJosef Bacik btrfs_free_path(path); 38223c04ce01SMiao Xie ret = PTR_ERR(trans); 38233c04ce01SMiao Xie goto out; 38246ef5ed0dSJosef Bacik } 38256ef5ed0dSJosef Bacik 38266c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 38276ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 38286ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3829cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38306ef5ed0dSJosef Bacik btrfs_free_path(path); 38316ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3832efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3833efe120a0SFrank Holton "item, this isn't going to work"); 38343c04ce01SMiao Xie ret = -ENOENT; 38353c04ce01SMiao Xie goto out; 38366ef5ed0dSJosef Bacik } 38376ef5ed0dSJosef Bacik 38386ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38396ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38406ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38416ef5ed0dSJosef Bacik btrfs_free_path(path); 38426ef5ed0dSJosef Bacik 38432b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 38446ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 38453c04ce01SMiao Xie out: 38463c04ce01SMiao Xie mnt_drop_write_file(file); 38473c04ce01SMiao Xie return ret; 38486ef5ed0dSJosef Bacik } 38496ef5ed0dSJosef Bacik 38505af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3851bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3852bf5fc093SJosef Bacik { 3853bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3854bf5fc093SJosef Bacik 3855bf5fc093SJosef Bacik space->total_bytes = 0; 3856bf5fc093SJosef Bacik space->used_bytes = 0; 3857bf5fc093SJosef Bacik space->flags = 0; 3858bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3859bf5fc093SJosef Bacik space->flags = block_group->flags; 3860bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3861bf5fc093SJosef Bacik space->used_bytes += 3862bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3863bf5fc093SJosef Bacik } 3864bf5fc093SJosef Bacik } 3865bf5fc093SJosef Bacik 386648a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 38671406e432SJosef Bacik { 38681406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38691406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38701406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38717fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 387213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38731406e432SJosef Bacik struct btrfs_space_info *info; 3874bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3875bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3876bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3877bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3878bf5fc093SJosef Bacik int num_types = 4; 38797fde62bfSChris Mason int alloc_size; 38801406e432SJosef Bacik int ret = 0; 388151788b1bSDan Rosenberg u64 slot_count = 0; 3882bf5fc093SJosef Bacik int i, c; 38831406e432SJosef Bacik 38841406e432SJosef Bacik if (copy_from_user(&space_args, 38851406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38861406e432SJosef Bacik sizeof(space_args))) 38871406e432SJosef Bacik return -EFAULT; 38881406e432SJosef Bacik 3889bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3890bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3891bf5fc093SJosef Bacik 3892bf5fc093SJosef Bacik info = NULL; 38937fde62bfSChris Mason rcu_read_lock(); 3894bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3895bf5fc093SJosef Bacik list) { 3896bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3897bf5fc093SJosef Bacik info = tmp; 3898bf5fc093SJosef Bacik break; 3899bf5fc093SJosef Bacik } 3900bf5fc093SJosef Bacik } 39017fde62bfSChris Mason rcu_read_unlock(); 39021406e432SJosef Bacik 3903bf5fc093SJosef Bacik if (!info) 3904bf5fc093SJosef Bacik continue; 3905bf5fc093SJosef Bacik 3906bf5fc093SJosef Bacik down_read(&info->groups_sem); 3907bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3908bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3909bf5fc093SJosef Bacik slot_count++; 3910bf5fc093SJosef Bacik } 3911bf5fc093SJosef Bacik up_read(&info->groups_sem); 3912bf5fc093SJosef Bacik } 3913bf5fc093SJosef Bacik 391436523e95SDavid Sterba /* 391536523e95SDavid Sterba * Global block reserve, exported as a space_info 391636523e95SDavid Sterba */ 391736523e95SDavid Sterba slot_count++; 391836523e95SDavid Sterba 39197fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39207fde62bfSChris Mason if (space_args.space_slots == 0) { 39217fde62bfSChris Mason space_args.total_spaces = slot_count; 39227fde62bfSChris Mason goto out; 39237fde62bfSChris Mason } 3924bf5fc093SJosef Bacik 392551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3926bf5fc093SJosef Bacik 39277fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3928bf5fc093SJosef Bacik 39297fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39307fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39317fde62bfSChris Mason */ 39327fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 39337fde62bfSChris Mason return -ENOMEM; 39347fde62bfSChris Mason 39357fde62bfSChris Mason space_args.total_spaces = 0; 39367fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 39377fde62bfSChris Mason if (!dest) 39387fde62bfSChris Mason return -ENOMEM; 39397fde62bfSChris Mason dest_orig = dest; 39407fde62bfSChris Mason 39417fde62bfSChris Mason /* now we have a buffer to copy into */ 3942bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3943bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3944bf5fc093SJosef Bacik 394551788b1bSDan Rosenberg if (!slot_count) 394651788b1bSDan Rosenberg break; 394751788b1bSDan Rosenberg 3948bf5fc093SJosef Bacik info = NULL; 39491406e432SJosef Bacik rcu_read_lock(); 3950bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3951bf5fc093SJosef Bacik list) { 3952bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3953bf5fc093SJosef Bacik info = tmp; 39547fde62bfSChris Mason break; 3955bf5fc093SJosef Bacik } 3956bf5fc093SJosef Bacik } 3957bf5fc093SJosef Bacik rcu_read_unlock(); 39587fde62bfSChris Mason 3959bf5fc093SJosef Bacik if (!info) 3960bf5fc093SJosef Bacik continue; 3961bf5fc093SJosef Bacik down_read(&info->groups_sem); 3962bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3963bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 39645af3e8ccSStefan Behrens btrfs_get_block_group_info( 39655af3e8ccSStefan Behrens &info->block_groups[c], &space); 39667fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39671406e432SJosef Bacik dest++; 39681406e432SJosef Bacik space_args.total_spaces++; 396951788b1bSDan Rosenberg slot_count--; 39701406e432SJosef Bacik } 397151788b1bSDan Rosenberg if (!slot_count) 397251788b1bSDan Rosenberg break; 3973bf5fc093SJosef Bacik } 3974bf5fc093SJosef Bacik up_read(&info->groups_sem); 3975bf5fc093SJosef Bacik } 39761406e432SJosef Bacik 397736523e95SDavid Sterba /* 397836523e95SDavid Sterba * Add global block reserve 397936523e95SDavid Sterba */ 398036523e95SDavid Sterba if (slot_count) { 398136523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 398236523e95SDavid Sterba 398336523e95SDavid Sterba spin_lock(&block_rsv->lock); 398436523e95SDavid Sterba space.total_bytes = block_rsv->size; 398536523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 398636523e95SDavid Sterba spin_unlock(&block_rsv->lock); 398736523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 398836523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 398936523e95SDavid Sterba space_args.total_spaces++; 399036523e95SDavid Sterba } 399136523e95SDavid Sterba 39922eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39937fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39947fde62bfSChris Mason 39957fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39967fde62bfSChris Mason ret = -EFAULT; 39977fde62bfSChris Mason 39987fde62bfSChris Mason kfree(dest_orig); 39997fde62bfSChris Mason out: 40007fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 40011406e432SJosef Bacik ret = -EFAULT; 40021406e432SJosef Bacik 40031406e432SJosef Bacik return ret; 40041406e432SJosef Bacik } 40051406e432SJosef Bacik 4006f46b5a66SChristoph Hellwig /* 4007f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4008f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4009f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4010f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4011f46b5a66SChristoph Hellwig */ 4012f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4013f46b5a66SChristoph Hellwig { 4014496ad9aaSAl Viro struct inode *inode = file_inode(file); 4015f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4016f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4017f46b5a66SChristoph Hellwig 4018f46b5a66SChristoph Hellwig trans = file->private_data; 40191ab86aedSSage Weil if (!trans) 40201ab86aedSSage Weil return -EINVAL; 4021b214107eSChristoph Hellwig file->private_data = NULL; 40229ca9ee09SSage Weil 40231ab86aedSSage Weil btrfs_end_transaction(trans, root); 40241ab86aedSSage Weil 4025a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 40269ca9ee09SSage Weil 40272a79f17eSAl Viro mnt_drop_write_file(file); 40281ab86aedSSage Weil return 0; 4029f46b5a66SChristoph Hellwig } 4030f46b5a66SChristoph Hellwig 40319a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40329a8c28beSMiao Xie void __user *argp) 403346204592SSage Weil { 403446204592SSage Weil struct btrfs_trans_handle *trans; 403546204592SSage Weil u64 transid; 4036db5b493aSTsutomu Itoh int ret; 403746204592SSage Weil 4038d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4039ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4040ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 404198d5dc13STsutomu Itoh return PTR_ERR(trans); 4042ff7c1d33SMiao Xie 4043ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4044ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4045ff7c1d33SMiao Xie goto out; 4046ff7c1d33SMiao Xie } 404746204592SSage Weil transid = trans->transid; 4048db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 40498b2b2d3cSTsutomu Itoh if (ret) { 40508b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4051db5b493aSTsutomu Itoh return ret; 40528b2b2d3cSTsutomu Itoh } 4053ff7c1d33SMiao Xie out: 405446204592SSage Weil if (argp) 405546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 405646204592SSage Weil return -EFAULT; 405746204592SSage Weil return 0; 405846204592SSage Weil } 405946204592SSage Weil 40609a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 40619a8c28beSMiao Xie void __user *argp) 406246204592SSage Weil { 406346204592SSage Weil u64 transid; 406446204592SSage Weil 406546204592SSage Weil if (argp) { 406646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 406746204592SSage Weil return -EFAULT; 406846204592SSage Weil } else { 406946204592SSage Weil transid = 0; /* current trans */ 407046204592SSage Weil } 407146204592SSage Weil return btrfs_wait_for_commit(root, transid); 407246204592SSage Weil } 407346204592SSage Weil 4074b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4075475f6387SJan Schmidt { 4076496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4077475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4078b8e95489SMiao Xie int ret; 4079475f6387SJan Schmidt 4080475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4081475f6387SJan Schmidt return -EPERM; 4082475f6387SJan Schmidt 4083475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4084475f6387SJan Schmidt if (IS_ERR(sa)) 4085475f6387SJan Schmidt return PTR_ERR(sa); 4086475f6387SJan Schmidt 4087b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4088b8e95489SMiao Xie ret = mnt_want_write_file(file); 4089b8e95489SMiao Xie if (ret) 4090b8e95489SMiao Xie goto out; 4091b8e95489SMiao Xie } 4092b8e95489SMiao Xie 4093aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 409463a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 409563a212abSStefan Behrens 0); 4096475f6387SJan Schmidt 4097475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4098475f6387SJan Schmidt ret = -EFAULT; 4099475f6387SJan Schmidt 4100b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4101b8e95489SMiao Xie mnt_drop_write_file(file); 4102b8e95489SMiao Xie out: 4103475f6387SJan Schmidt kfree(sa); 4104475f6387SJan Schmidt return ret; 4105475f6387SJan Schmidt } 4106475f6387SJan Schmidt 4107475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4108475f6387SJan Schmidt { 4109475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4110475f6387SJan Schmidt return -EPERM; 4111475f6387SJan Schmidt 4112aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4113475f6387SJan Schmidt } 4114475f6387SJan Schmidt 4115475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4116475f6387SJan Schmidt void __user *arg) 4117475f6387SJan Schmidt { 4118475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4119475f6387SJan Schmidt int ret; 4120475f6387SJan Schmidt 4121475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4122475f6387SJan Schmidt return -EPERM; 4123475f6387SJan Schmidt 4124475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4125475f6387SJan Schmidt if (IS_ERR(sa)) 4126475f6387SJan Schmidt return PTR_ERR(sa); 4127475f6387SJan Schmidt 4128475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4129475f6387SJan Schmidt 4130475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4131475f6387SJan Schmidt ret = -EFAULT; 4132475f6387SJan Schmidt 4133475f6387SJan Schmidt kfree(sa); 4134475f6387SJan Schmidt return ret; 4135475f6387SJan Schmidt } 4136475f6387SJan Schmidt 4137c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4138b27f7c0cSDavid Sterba void __user *arg) 4139c11d2c23SStefan Behrens { 4140c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4141c11d2c23SStefan Behrens int ret; 4142c11d2c23SStefan Behrens 4143c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4144c11d2c23SStefan Behrens if (IS_ERR(sa)) 4145c11d2c23SStefan Behrens return PTR_ERR(sa); 4146c11d2c23SStefan Behrens 4147b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4148b27f7c0cSDavid Sterba kfree(sa); 4149b27f7c0cSDavid Sterba return -EPERM; 4150b27f7c0cSDavid Sterba } 4151b27f7c0cSDavid Sterba 4152b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4153c11d2c23SStefan Behrens 4154c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4155c11d2c23SStefan Behrens ret = -EFAULT; 4156c11d2c23SStefan Behrens 4157c11d2c23SStefan Behrens kfree(sa); 4158c11d2c23SStefan Behrens return ret; 4159c11d2c23SStefan Behrens } 4160c11d2c23SStefan Behrens 41613f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 41623f6bcfbdSStefan Behrens { 41633f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41643f6bcfbdSStefan Behrens int ret; 41653f6bcfbdSStefan Behrens 41663f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41673f6bcfbdSStefan Behrens return -EPERM; 41683f6bcfbdSStefan Behrens 41693f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41703f6bcfbdSStefan Behrens if (IS_ERR(p)) 41713f6bcfbdSStefan Behrens return PTR_ERR(p); 41723f6bcfbdSStefan Behrens 41733f6bcfbdSStefan Behrens switch (p->cmd) { 41743f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4175adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4176adfa97cbSIlya Dryomov ret = -EROFS; 4177adfa97cbSIlya Dryomov goto out; 4178adfa97cbSIlya Dryomov } 41793f6bcfbdSStefan Behrens if (atomic_xchg( 41803f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41813f6bcfbdSStefan Behrens 1)) { 4182e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41833f6bcfbdSStefan Behrens } else { 41843f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 41853f6bcfbdSStefan Behrens atomic_set( 41863f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41873f6bcfbdSStefan Behrens 0); 41883f6bcfbdSStefan Behrens } 41893f6bcfbdSStefan Behrens break; 41903f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41913f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 41923f6bcfbdSStefan Behrens ret = 0; 41933f6bcfbdSStefan Behrens break; 41943f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 41953f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 41963f6bcfbdSStefan Behrens break; 41973f6bcfbdSStefan Behrens default: 41983f6bcfbdSStefan Behrens ret = -EINVAL; 41993f6bcfbdSStefan Behrens break; 42003f6bcfbdSStefan Behrens } 42013f6bcfbdSStefan Behrens 42023f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 42033f6bcfbdSStefan Behrens ret = -EFAULT; 4204adfa97cbSIlya Dryomov out: 42053f6bcfbdSStefan Behrens kfree(p); 42063f6bcfbdSStefan Behrens return ret; 42073f6bcfbdSStefan Behrens } 42083f6bcfbdSStefan Behrens 4209d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4210d7728c96SJan Schmidt { 4211d7728c96SJan Schmidt int ret = 0; 4212d7728c96SJan Schmidt int i; 4213740c3d22SChris Mason u64 rel_ptr; 4214d7728c96SJan Schmidt int size; 4215806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4216d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4217d7728c96SJan Schmidt struct btrfs_path *path; 4218d7728c96SJan Schmidt 421982b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4220d7728c96SJan Schmidt return -EPERM; 4221d7728c96SJan Schmidt 4222d7728c96SJan Schmidt path = btrfs_alloc_path(); 4223d7728c96SJan Schmidt if (!path) { 4224d7728c96SJan Schmidt ret = -ENOMEM; 4225d7728c96SJan Schmidt goto out; 4226d7728c96SJan Schmidt } 4227d7728c96SJan Schmidt 4228d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4229d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4230d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4231d7728c96SJan Schmidt ipa = NULL; 4232d7728c96SJan Schmidt goto out; 4233d7728c96SJan Schmidt } 4234d7728c96SJan Schmidt 4235d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4236d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4237d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4238d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4239d7728c96SJan Schmidt ipath = NULL; 4240d7728c96SJan Schmidt goto out; 4241d7728c96SJan Schmidt } 4242d7728c96SJan Schmidt 4243d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4244d7728c96SJan Schmidt if (ret < 0) 4245d7728c96SJan Schmidt goto out; 4246d7728c96SJan Schmidt 4247d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4248745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4249745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4250740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4251d7728c96SJan Schmidt } 4252d7728c96SJan Schmidt 4253745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4254745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4255d7728c96SJan Schmidt if (ret) { 4256d7728c96SJan Schmidt ret = -EFAULT; 4257d7728c96SJan Schmidt goto out; 4258d7728c96SJan Schmidt } 4259d7728c96SJan Schmidt 4260d7728c96SJan Schmidt out: 4261d7728c96SJan Schmidt btrfs_free_path(path); 4262d7728c96SJan Schmidt free_ipath(ipath); 4263d7728c96SJan Schmidt kfree(ipa); 4264d7728c96SJan Schmidt 4265d7728c96SJan Schmidt return ret; 4266d7728c96SJan Schmidt } 4267d7728c96SJan Schmidt 4268d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4269d7728c96SJan Schmidt { 4270d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4271d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4272d7728c96SJan Schmidt 4273d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4274d7728c96SJan Schmidt inodes->bytes_left -= c; 4275d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4276d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4277d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4278d7728c96SJan Schmidt inodes->elem_cnt += 3; 4279d7728c96SJan Schmidt } else { 4280d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4281d7728c96SJan Schmidt inodes->bytes_left = 0; 4282d7728c96SJan Schmidt inodes->elem_missed += 3; 4283d7728c96SJan Schmidt } 4284d7728c96SJan Schmidt 4285d7728c96SJan Schmidt return 0; 4286d7728c96SJan Schmidt } 4287d7728c96SJan Schmidt 4288d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4289d7728c96SJan Schmidt void __user *arg) 4290d7728c96SJan Schmidt { 4291d7728c96SJan Schmidt int ret = 0; 4292d7728c96SJan Schmidt int size; 4293d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4294d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4295d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4296d7728c96SJan Schmidt 4297d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4298d7728c96SJan Schmidt return -EPERM; 4299d7728c96SJan Schmidt 4300d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4301d7728c96SJan Schmidt if (IS_ERR(loi)) { 4302d7728c96SJan Schmidt ret = PTR_ERR(loi); 4303d7728c96SJan Schmidt loi = NULL; 4304d7728c96SJan Schmidt goto out; 4305d7728c96SJan Schmidt } 4306d7728c96SJan Schmidt 4307d7728c96SJan Schmidt path = btrfs_alloc_path(); 4308d7728c96SJan Schmidt if (!path) { 4309d7728c96SJan Schmidt ret = -ENOMEM; 4310d7728c96SJan Schmidt goto out; 4311d7728c96SJan Schmidt } 4312d7728c96SJan Schmidt 4313425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4314d7728c96SJan Schmidt inodes = init_data_container(size); 4315d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4316d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4317d7728c96SJan Schmidt inodes = NULL; 4318d7728c96SJan Schmidt goto out; 4319d7728c96SJan Schmidt } 4320d7728c96SJan Schmidt 4321df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4322df031f07SLiu Bo build_ino_list, inodes); 4323df031f07SLiu Bo if (ret == -EINVAL) 4324d7728c96SJan Schmidt ret = -ENOENT; 4325d7728c96SJan Schmidt if (ret < 0) 4326d7728c96SJan Schmidt goto out; 4327d7728c96SJan Schmidt 4328745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4329745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4330d7728c96SJan Schmidt if (ret) 4331d7728c96SJan Schmidt ret = -EFAULT; 4332d7728c96SJan Schmidt 4333d7728c96SJan Schmidt out: 4334d7728c96SJan Schmidt btrfs_free_path(path); 4335425d17a2SLiu Bo vfree(inodes); 4336d7728c96SJan Schmidt kfree(loi); 4337d7728c96SJan Schmidt 4338d7728c96SJan Schmidt return ret; 4339d7728c96SJan Schmidt } 4340d7728c96SJan Schmidt 434119a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4342c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4343c9e9f97bSIlya Dryomov { 4344c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4345c9e9f97bSIlya Dryomov 4346c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4347c9e9f97bSIlya Dryomov 4348837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4349837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4350837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4351837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4352a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4353a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4354837d5b6eSIlya Dryomov 4355c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4356c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4357c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 435819a39dceSIlya Dryomov 435919a39dceSIlya Dryomov if (lock) { 436019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 436119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 436219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 436319a39dceSIlya Dryomov } else { 436419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 436519a39dceSIlya Dryomov } 4366c9e9f97bSIlya Dryomov } 4367c9e9f97bSIlya Dryomov 43689ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4369c9e9f97bSIlya Dryomov { 4370496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4371c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4372c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4373c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4374ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4375c9e9f97bSIlya Dryomov int ret; 4376c9e9f97bSIlya Dryomov 4377c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4378c9e9f97bSIlya Dryomov return -EPERM; 4379c9e9f97bSIlya Dryomov 4380e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43819ba1f6e4SLiu Bo if (ret) 43829ba1f6e4SLiu Bo return ret; 43839ba1f6e4SLiu Bo 4384ed0fb78fSIlya Dryomov again: 4385ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4386c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4387c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4388ed0fb78fSIlya Dryomov need_unlock = true; 4389ed0fb78fSIlya Dryomov goto locked; 4390ed0fb78fSIlya Dryomov } 4391ed0fb78fSIlya Dryomov 4392ed0fb78fSIlya Dryomov /* 4393ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4394ed0fb78fSIlya Dryomov * (1) some other op is running 4395ed0fb78fSIlya Dryomov * (2) balance is running 4396ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4397ed0fb78fSIlya Dryomov */ 4398ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4399ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4400ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4401ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4402ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4403ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4404ed0fb78fSIlya Dryomov goto again; 4405ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4406ed0fb78fSIlya Dryomov 4407ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4408ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4409ed0fb78fSIlya Dryomov /* this is (3) */ 4410ed0fb78fSIlya Dryomov need_unlock = false; 4411ed0fb78fSIlya Dryomov goto locked; 4412ed0fb78fSIlya Dryomov } 4413ed0fb78fSIlya Dryomov 4414ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4415ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4416ed0fb78fSIlya Dryomov goto again; 4417ed0fb78fSIlya Dryomov } else { 4418ed0fb78fSIlya Dryomov /* this is (2) */ 4419ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4420ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4421ed0fb78fSIlya Dryomov goto out; 4422ed0fb78fSIlya Dryomov } 4423ed0fb78fSIlya Dryomov } else { 4424ed0fb78fSIlya Dryomov /* this is (1) */ 4425ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4426e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4427ed0fb78fSIlya Dryomov goto out; 4428ed0fb78fSIlya Dryomov } 4429ed0fb78fSIlya Dryomov 4430ed0fb78fSIlya Dryomov locked: 4431ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4432c9e9f97bSIlya Dryomov 4433c9e9f97bSIlya Dryomov if (arg) { 4434c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4435c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4436c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4437ed0fb78fSIlya Dryomov goto out_unlock; 4438c9e9f97bSIlya Dryomov } 4439de322263SIlya Dryomov 4440de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4441de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4442de322263SIlya Dryomov ret = -ENOTCONN; 4443de322263SIlya Dryomov goto out_bargs; 4444de322263SIlya Dryomov } 4445de322263SIlya Dryomov 4446de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4447de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4448de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4449de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4450de322263SIlya Dryomov 4451de322263SIlya Dryomov goto do_balance; 4452de322263SIlya Dryomov } 4453c9e9f97bSIlya Dryomov } else { 4454c9e9f97bSIlya Dryomov bargs = NULL; 4455c9e9f97bSIlya Dryomov } 4456c9e9f97bSIlya Dryomov 4457ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4458837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4459837d5b6eSIlya Dryomov goto out_bargs; 4460837d5b6eSIlya Dryomov } 4461837d5b6eSIlya Dryomov 4462c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4463c9e9f97bSIlya Dryomov if (!bctl) { 4464c9e9f97bSIlya Dryomov ret = -ENOMEM; 4465c9e9f97bSIlya Dryomov goto out_bargs; 4466c9e9f97bSIlya Dryomov } 4467c9e9f97bSIlya Dryomov 4468c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4469c9e9f97bSIlya Dryomov if (arg) { 4470c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4471c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4472c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4473c9e9f97bSIlya Dryomov 4474c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4475f43ffb60SIlya Dryomov } else { 4476f43ffb60SIlya Dryomov /* balance everything - no filters */ 4477f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4478c9e9f97bSIlya Dryomov } 4479c9e9f97bSIlya Dryomov 4480de322263SIlya Dryomov do_balance: 4481c9e9f97bSIlya Dryomov /* 4482ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4483ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4484ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4485ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4486ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4487c9e9f97bSIlya Dryomov */ 4488ed0fb78fSIlya Dryomov need_unlock = false; 4489ed0fb78fSIlya Dryomov 4490ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4491ed0fb78fSIlya Dryomov 4492c9e9f97bSIlya Dryomov if (arg) { 4493c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4494c9e9f97bSIlya Dryomov ret = -EFAULT; 4495c9e9f97bSIlya Dryomov } 4496c9e9f97bSIlya Dryomov 4497c9e9f97bSIlya Dryomov out_bargs: 4498c9e9f97bSIlya Dryomov kfree(bargs); 4499ed0fb78fSIlya Dryomov out_unlock: 4500c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4501c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4502ed0fb78fSIlya Dryomov if (need_unlock) 4503ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4504ed0fb78fSIlya Dryomov out: 4505e54bfa31SLiu Bo mnt_drop_write_file(file); 4506c9e9f97bSIlya Dryomov return ret; 4507c9e9f97bSIlya Dryomov } 4508c9e9f97bSIlya Dryomov 4509837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4510837d5b6eSIlya Dryomov { 4511837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4512837d5b6eSIlya Dryomov return -EPERM; 4513837d5b6eSIlya Dryomov 4514837d5b6eSIlya Dryomov switch (cmd) { 4515837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4516837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4517a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4518a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4519837d5b6eSIlya Dryomov } 4520837d5b6eSIlya Dryomov 4521837d5b6eSIlya Dryomov return -EINVAL; 4522837d5b6eSIlya Dryomov } 4523837d5b6eSIlya Dryomov 452419a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 452519a39dceSIlya Dryomov void __user *arg) 452619a39dceSIlya Dryomov { 452719a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 452819a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 452919a39dceSIlya Dryomov int ret = 0; 453019a39dceSIlya Dryomov 453119a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 453219a39dceSIlya Dryomov return -EPERM; 453319a39dceSIlya Dryomov 453419a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 453519a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 453619a39dceSIlya Dryomov ret = -ENOTCONN; 453719a39dceSIlya Dryomov goto out; 453819a39dceSIlya Dryomov } 453919a39dceSIlya Dryomov 454019a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 454119a39dceSIlya Dryomov if (!bargs) { 454219a39dceSIlya Dryomov ret = -ENOMEM; 454319a39dceSIlya Dryomov goto out; 454419a39dceSIlya Dryomov } 454519a39dceSIlya Dryomov 454619a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 454719a39dceSIlya Dryomov 454819a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 454919a39dceSIlya Dryomov ret = -EFAULT; 455019a39dceSIlya Dryomov 455119a39dceSIlya Dryomov kfree(bargs); 455219a39dceSIlya Dryomov out: 455319a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 455419a39dceSIlya Dryomov return ret; 455519a39dceSIlya Dryomov } 455619a39dceSIlya Dryomov 4557905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45585d13a37bSArne Jansen { 4559496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45605d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45615d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 45625d13a37bSArne Jansen int ret; 45635d13a37bSArne Jansen int err; 45645d13a37bSArne Jansen 45655d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45665d13a37bSArne Jansen return -EPERM; 45675d13a37bSArne Jansen 4568905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4569905b0ddaSMiao Xie if (ret) 4570905b0ddaSMiao Xie return ret; 45715d13a37bSArne Jansen 45725d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4573905b0ddaSMiao Xie if (IS_ERR(sa)) { 4574905b0ddaSMiao Xie ret = PTR_ERR(sa); 4575905b0ddaSMiao Xie goto drop_write; 4576905b0ddaSMiao Xie } 45775d13a37bSArne Jansen 45787708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 457992f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 45805d13a37bSArne Jansen if (IS_ERR(trans)) { 45815d13a37bSArne Jansen ret = PTR_ERR(trans); 45825d13a37bSArne Jansen goto out; 45835d13a37bSArne Jansen } 45845d13a37bSArne Jansen 45855d13a37bSArne Jansen switch (sa->cmd) { 45865d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 45875d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 45885d13a37bSArne Jansen break; 45895d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 45905d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 45915d13a37bSArne Jansen break; 45925d13a37bSArne Jansen default: 45935d13a37bSArne Jansen ret = -EINVAL; 45945d13a37bSArne Jansen break; 45955d13a37bSArne Jansen } 45965d13a37bSArne Jansen 459792f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 45985d13a37bSArne Jansen if (err && !ret) 45995d13a37bSArne Jansen ret = err; 46005d13a37bSArne Jansen out: 46015d13a37bSArne Jansen kfree(sa); 46027708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4603905b0ddaSMiao Xie drop_write: 4604905b0ddaSMiao Xie mnt_drop_write_file(file); 46055d13a37bSArne Jansen return ret; 46065d13a37bSArne Jansen } 46075d13a37bSArne Jansen 4608905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 46095d13a37bSArne Jansen { 4610496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46115d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 46125d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46135d13a37bSArne Jansen int ret; 46145d13a37bSArne Jansen int err; 46155d13a37bSArne Jansen 46165d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46175d13a37bSArne Jansen return -EPERM; 46185d13a37bSArne Jansen 4619905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4620905b0ddaSMiao Xie if (ret) 4621905b0ddaSMiao Xie return ret; 46225d13a37bSArne Jansen 46235d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4624905b0ddaSMiao Xie if (IS_ERR(sa)) { 4625905b0ddaSMiao Xie ret = PTR_ERR(sa); 4626905b0ddaSMiao Xie goto drop_write; 4627905b0ddaSMiao Xie } 46285d13a37bSArne Jansen 46295d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46305d13a37bSArne Jansen if (IS_ERR(trans)) { 46315d13a37bSArne Jansen ret = PTR_ERR(trans); 46325d13a37bSArne Jansen goto out; 46335d13a37bSArne Jansen } 46345d13a37bSArne Jansen 46355d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46365d13a37bSArne Jansen if (sa->assign) { 46375d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 46385d13a37bSArne Jansen sa->src, sa->dst); 46395d13a37bSArne Jansen } else { 46405d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 46415d13a37bSArne Jansen sa->src, sa->dst); 46425d13a37bSArne Jansen } 46435d13a37bSArne Jansen 46445d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46455d13a37bSArne Jansen if (err && !ret) 46465d13a37bSArne Jansen ret = err; 46475d13a37bSArne Jansen 46485d13a37bSArne Jansen out: 46495d13a37bSArne Jansen kfree(sa); 4650905b0ddaSMiao Xie drop_write: 4651905b0ddaSMiao Xie mnt_drop_write_file(file); 46525d13a37bSArne Jansen return ret; 46535d13a37bSArne Jansen } 46545d13a37bSArne Jansen 4655905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46565d13a37bSArne Jansen { 4657496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46585d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46595d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46605d13a37bSArne Jansen int ret; 46615d13a37bSArne Jansen int err; 46625d13a37bSArne Jansen 46635d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46645d13a37bSArne Jansen return -EPERM; 46655d13a37bSArne Jansen 4666905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4667905b0ddaSMiao Xie if (ret) 4668905b0ddaSMiao Xie return ret; 46695d13a37bSArne Jansen 46705d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4671905b0ddaSMiao Xie if (IS_ERR(sa)) { 4672905b0ddaSMiao Xie ret = PTR_ERR(sa); 4673905b0ddaSMiao Xie goto drop_write; 4674905b0ddaSMiao Xie } 46755d13a37bSArne Jansen 4676d86e56cfSMiao Xie if (!sa->qgroupid) { 4677d86e56cfSMiao Xie ret = -EINVAL; 4678d86e56cfSMiao Xie goto out; 4679d86e56cfSMiao Xie } 4680d86e56cfSMiao Xie 46815d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46825d13a37bSArne Jansen if (IS_ERR(trans)) { 46835d13a37bSArne Jansen ret = PTR_ERR(trans); 46845d13a37bSArne Jansen goto out; 46855d13a37bSArne Jansen } 46865d13a37bSArne Jansen 46875d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46885d13a37bSArne Jansen if (sa->create) { 46895d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 46905d13a37bSArne Jansen NULL); 46915d13a37bSArne Jansen } else { 46925d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 46935d13a37bSArne Jansen } 46945d13a37bSArne Jansen 46955d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46965d13a37bSArne Jansen if (err && !ret) 46975d13a37bSArne Jansen ret = err; 46985d13a37bSArne Jansen 46995d13a37bSArne Jansen out: 47005d13a37bSArne Jansen kfree(sa); 4701905b0ddaSMiao Xie drop_write: 4702905b0ddaSMiao Xie mnt_drop_write_file(file); 47035d13a37bSArne Jansen return ret; 47045d13a37bSArne Jansen } 47055d13a37bSArne Jansen 4706905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 47075d13a37bSArne Jansen { 4708496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47095d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 47105d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47115d13a37bSArne Jansen int ret; 47125d13a37bSArne Jansen int err; 47135d13a37bSArne Jansen u64 qgroupid; 47145d13a37bSArne Jansen 47155d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47165d13a37bSArne Jansen return -EPERM; 47175d13a37bSArne Jansen 4718905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4719905b0ddaSMiao Xie if (ret) 4720905b0ddaSMiao Xie return ret; 47215d13a37bSArne Jansen 47225d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4723905b0ddaSMiao Xie if (IS_ERR(sa)) { 4724905b0ddaSMiao Xie ret = PTR_ERR(sa); 4725905b0ddaSMiao Xie goto drop_write; 4726905b0ddaSMiao Xie } 47275d13a37bSArne Jansen 47285d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47295d13a37bSArne Jansen if (IS_ERR(trans)) { 47305d13a37bSArne Jansen ret = PTR_ERR(trans); 47315d13a37bSArne Jansen goto out; 47325d13a37bSArne Jansen } 47335d13a37bSArne Jansen 47345d13a37bSArne Jansen qgroupid = sa->qgroupid; 47355d13a37bSArne Jansen if (!qgroupid) { 47365d13a37bSArne Jansen /* take the current subvol as qgroup */ 47375d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47385d13a37bSArne Jansen } 47395d13a37bSArne Jansen 47405d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 47415d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 47425d13a37bSArne Jansen 47435d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47445d13a37bSArne Jansen if (err && !ret) 47455d13a37bSArne Jansen ret = err; 47465d13a37bSArne Jansen 47475d13a37bSArne Jansen out: 47485d13a37bSArne Jansen kfree(sa); 4749905b0ddaSMiao Xie drop_write: 4750905b0ddaSMiao Xie mnt_drop_write_file(file); 47515d13a37bSArne Jansen return ret; 47525d13a37bSArne Jansen } 47535d13a37bSArne Jansen 47542f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47552f232036SJan Schmidt { 47566d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47572f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47582f232036SJan Schmidt int ret; 47592f232036SJan Schmidt 47602f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47612f232036SJan Schmidt return -EPERM; 47622f232036SJan Schmidt 47632f232036SJan Schmidt ret = mnt_want_write_file(file); 47642f232036SJan Schmidt if (ret) 47652f232036SJan Schmidt return ret; 47662f232036SJan Schmidt 47672f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47682f232036SJan Schmidt if (IS_ERR(qsa)) { 47692f232036SJan Schmidt ret = PTR_ERR(qsa); 47702f232036SJan Schmidt goto drop_write; 47712f232036SJan Schmidt } 47722f232036SJan Schmidt 47732f232036SJan Schmidt if (qsa->flags) { 47742f232036SJan Schmidt ret = -EINVAL; 47752f232036SJan Schmidt goto out; 47762f232036SJan Schmidt } 47772f232036SJan Schmidt 47782f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 47792f232036SJan Schmidt 47802f232036SJan Schmidt out: 47812f232036SJan Schmidt kfree(qsa); 47822f232036SJan Schmidt drop_write: 47832f232036SJan Schmidt mnt_drop_write_file(file); 47842f232036SJan Schmidt return ret; 47852f232036SJan Schmidt } 47862f232036SJan Schmidt 47872f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 47882f232036SJan Schmidt { 47896d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47902f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47912f232036SJan Schmidt int ret = 0; 47922f232036SJan Schmidt 47932f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47942f232036SJan Schmidt return -EPERM; 47952f232036SJan Schmidt 47962f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 47972f232036SJan Schmidt if (!qsa) 47982f232036SJan Schmidt return -ENOMEM; 47992f232036SJan Schmidt 48002f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 48012f232036SJan Schmidt qsa->flags = 1; 48022f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 48032f232036SJan Schmidt } 48042f232036SJan Schmidt 48052f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 48062f232036SJan Schmidt ret = -EFAULT; 48072f232036SJan Schmidt 48082f232036SJan Schmidt kfree(qsa); 48092f232036SJan Schmidt return ret; 48102f232036SJan Schmidt } 48112f232036SJan Schmidt 481257254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 481357254b6eSJan Schmidt { 481454563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 481557254b6eSJan Schmidt 481657254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 481757254b6eSJan Schmidt return -EPERM; 481857254b6eSJan Schmidt 481957254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 482057254b6eSJan Schmidt } 482157254b6eSJan Schmidt 4822abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4823abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48248ea05e3aSAlexander Block { 4825496ad9aaSAl Viro struct inode *inode = file_inode(file); 48268ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48278ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48288ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 48298ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 48308ea05e3aSAlexander Block int ret = 0; 4831dd5f9615SStefan Behrens int received_uuid_changed; 48328ea05e3aSAlexander Block 4833bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4834bd60ea0fSDavid Sterba return -EPERM; 4835bd60ea0fSDavid Sterba 48368ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48378ea05e3aSAlexander Block if (ret < 0) 48388ea05e3aSAlexander Block return ret; 48398ea05e3aSAlexander Block 48408ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 48418ea05e3aSAlexander Block 48428ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 48438ea05e3aSAlexander Block ret = -EINVAL; 48448ea05e3aSAlexander Block goto out; 48458ea05e3aSAlexander Block } 48468ea05e3aSAlexander Block 48478ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48488ea05e3aSAlexander Block ret = -EROFS; 48498ea05e3aSAlexander Block goto out; 48508ea05e3aSAlexander Block } 48518ea05e3aSAlexander Block 4852dd5f9615SStefan Behrens /* 4853dd5f9615SStefan Behrens * 1 - root item 4854dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4855dd5f9615SStefan Behrens */ 4856dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48578ea05e3aSAlexander Block if (IS_ERR(trans)) { 48588ea05e3aSAlexander Block ret = PTR_ERR(trans); 48598ea05e3aSAlexander Block trans = NULL; 48608ea05e3aSAlexander Block goto out; 48618ea05e3aSAlexander Block } 48628ea05e3aSAlexander Block 48638ea05e3aSAlexander Block sa->rtransid = trans->transid; 48648ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48658ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48668ea05e3aSAlexander Block 4867dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4868dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4869dd5f9615SStefan Behrens if (received_uuid_changed && 4870dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4871dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4872dd5f9615SStefan Behrens root_item->received_uuid, 4873dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4874dd5f9615SStefan Behrens root->root_key.objectid); 48758ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48768ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48778ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48783cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48793cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48803cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48813cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48828ea05e3aSAlexander Block 48838ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 48848ea05e3aSAlexander Block &root->root_key, &root->root_item); 48858ea05e3aSAlexander Block if (ret < 0) { 48868ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 48878ea05e3aSAlexander Block goto out; 4888dd5f9615SStefan Behrens } 4889dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4890dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4891dd5f9615SStefan Behrens sa->uuid, 4892dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4893dd5f9615SStefan Behrens root->root_key.objectid); 4894dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4895dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4896dd5f9615SStefan Behrens goto out; 4897dd5f9615SStefan Behrens } 4898dd5f9615SStefan Behrens } 48998ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4900dd5f9615SStefan Behrens if (ret < 0) { 4901dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 49028ea05e3aSAlexander Block goto out; 49038ea05e3aSAlexander Block } 49048ea05e3aSAlexander Block 4905abccd00fSHugo Mills out: 4906abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4907abccd00fSHugo Mills mnt_drop_write_file(file); 4908abccd00fSHugo Mills return ret; 4909abccd00fSHugo Mills } 4910abccd00fSHugo Mills 4911abccd00fSHugo Mills #ifdef CONFIG_64BIT 4912abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4913abccd00fSHugo Mills void __user *arg) 4914abccd00fSHugo Mills { 4915abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4916abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4917abccd00fSHugo Mills int ret = 0; 4918abccd00fSHugo Mills 4919abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4920abccd00fSHugo Mills if (IS_ERR(args32)) { 4921abccd00fSHugo Mills ret = PTR_ERR(args32); 4922abccd00fSHugo Mills args32 = NULL; 4923abccd00fSHugo Mills goto out; 4924abccd00fSHugo Mills } 4925abccd00fSHugo Mills 4926abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 492784dbeb87SDan Carpenter if (!args64) { 492884dbeb87SDan Carpenter ret = -ENOMEM; 4929abccd00fSHugo Mills goto out; 4930abccd00fSHugo Mills } 4931abccd00fSHugo Mills 4932abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4933abccd00fSHugo Mills args64->stransid = args32->stransid; 4934abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4935abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4936abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4937abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4938abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4939abccd00fSHugo Mills args64->flags = args32->flags; 4940abccd00fSHugo Mills 4941abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4942abccd00fSHugo Mills if (ret) 4943abccd00fSHugo Mills goto out; 4944abccd00fSHugo Mills 4945abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4946abccd00fSHugo Mills args32->stransid = args64->stransid; 4947abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4948abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4949abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4950abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4951abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4952abccd00fSHugo Mills args32->flags = args64->flags; 4953abccd00fSHugo Mills 4954abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4955abccd00fSHugo Mills if (ret) 4956abccd00fSHugo Mills ret = -EFAULT; 4957abccd00fSHugo Mills 4958abccd00fSHugo Mills out: 4959abccd00fSHugo Mills kfree(args32); 4960abccd00fSHugo Mills kfree(args64); 4961abccd00fSHugo Mills return ret; 4962abccd00fSHugo Mills } 4963abccd00fSHugo Mills #endif 4964abccd00fSHugo Mills 4965abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4966abccd00fSHugo Mills void __user *arg) 4967abccd00fSHugo Mills { 4968abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4969abccd00fSHugo Mills int ret = 0; 4970abccd00fSHugo Mills 4971abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4972abccd00fSHugo Mills if (IS_ERR(sa)) { 4973abccd00fSHugo Mills ret = PTR_ERR(sa); 4974abccd00fSHugo Mills sa = NULL; 4975abccd00fSHugo Mills goto out; 4976abccd00fSHugo Mills } 4977abccd00fSHugo Mills 4978abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4979abccd00fSHugo Mills 4980abccd00fSHugo Mills if (ret) 4981abccd00fSHugo Mills goto out; 4982abccd00fSHugo Mills 49838ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49848ea05e3aSAlexander Block if (ret) 49858ea05e3aSAlexander Block ret = -EFAULT; 49868ea05e3aSAlexander Block 49878ea05e3aSAlexander Block out: 49888ea05e3aSAlexander Block kfree(sa); 49898ea05e3aSAlexander Block return ret; 49908ea05e3aSAlexander Block } 49918ea05e3aSAlexander Block 4992867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4993867ab667Sjeff.liu { 49946d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4995a1b83ac5SAnand Jain size_t len; 4996867ab667Sjeff.liu int ret; 4997a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4998a1b83ac5SAnand Jain 4999a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5000a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 5001a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5002a1b83ac5SAnand Jain 5003a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5004867ab667Sjeff.liu 5005867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 5006efe120a0SFrank Holton btrfs_warn(root->fs_info, 5007efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5008867ab667Sjeff.liu } 5009867ab667Sjeff.liu 5010867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5011867ab667Sjeff.liu 5012867ab667Sjeff.liu return ret ? -EFAULT : 0; 5013867ab667Sjeff.liu } 5014867ab667Sjeff.liu 5015a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5016a8bfd4abSjeff.liu { 50176d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5018a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5019a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5020a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5021a8bfd4abSjeff.liu int ret; 5022a8bfd4abSjeff.liu 5023a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5024a8bfd4abSjeff.liu return -EPERM; 5025a8bfd4abSjeff.liu 5026a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5027a8bfd4abSjeff.liu return -EFAULT; 5028a8bfd4abSjeff.liu 5029a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5030efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5031a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5032a8bfd4abSjeff.liu return -EINVAL; 5033a8bfd4abSjeff.liu } 5034a8bfd4abSjeff.liu 5035a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5036a8bfd4abSjeff.liu if (ret) 5037a8bfd4abSjeff.liu return ret; 5038a8bfd4abSjeff.liu 5039a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5040a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5041a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5042a8bfd4abSjeff.liu goto out_unlock; 5043a8bfd4abSjeff.liu } 5044a8bfd4abSjeff.liu 5045a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5046a8bfd4abSjeff.liu strcpy(super_block->label, label); 5047a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5048d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5049a8bfd4abSjeff.liu 5050a8bfd4abSjeff.liu out_unlock: 5051a8bfd4abSjeff.liu mnt_drop_write_file(file); 5052a8bfd4abSjeff.liu return ret; 5053a8bfd4abSjeff.liu } 5054a8bfd4abSjeff.liu 50552eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50562eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50572eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50582eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50592eaa055fSJeff Mahoney 50602eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 50612eaa055fSJeff Mahoney void __user *arg) 50622eaa055fSJeff Mahoney { 50632eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 50642eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50652eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50662eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50672eaa055fSJeff Mahoney }; 50682eaa055fSJeff Mahoney 50692eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50702eaa055fSJeff Mahoney return -EFAULT; 50712eaa055fSJeff Mahoney 50722eaa055fSJeff Mahoney return 0; 50732eaa055fSJeff Mahoney } 50742eaa055fSJeff Mahoney 50752eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 50762eaa055fSJeff Mahoney { 50772eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 50782eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 50792eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50802eaa055fSJeff Mahoney 50812eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50822eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50832eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50842eaa055fSJeff Mahoney 50852eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50862eaa055fSJeff Mahoney return -EFAULT; 50872eaa055fSJeff Mahoney 50882eaa055fSJeff Mahoney return 0; 50892eaa055fSJeff Mahoney } 50902eaa055fSJeff Mahoney 50913b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 50923b02a68aSJeff Mahoney enum btrfs_feature_set set, 50932eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50942eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50952eaa055fSJeff Mahoney { 50963b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 50973b02a68aSJeff Mahoney char *names; 50982eaa055fSJeff Mahoney u64 disallowed, unsupported; 50992eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 51002eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 51012eaa055fSJeff Mahoney 51022eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 51032eaa055fSJeff Mahoney if (unsupported) { 51043b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 51053b02a68aSJeff Mahoney if (names) { 51063b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51073b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 51083b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51093b02a68aSJeff Mahoney kfree(names); 51103b02a68aSJeff Mahoney } else 51112eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51122eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 51132eaa055fSJeff Mahoney type, unsupported); 51142eaa055fSJeff Mahoney return -EOPNOTSUPP; 51152eaa055fSJeff Mahoney } 51162eaa055fSJeff Mahoney 51172eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51182eaa055fSJeff Mahoney if (disallowed) { 51193b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51203b02a68aSJeff Mahoney if (names) { 51213b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51223b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51233b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51243b02a68aSJeff Mahoney kfree(names); 51253b02a68aSJeff Mahoney } else 51262eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51272eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51282eaa055fSJeff Mahoney type, disallowed); 51292eaa055fSJeff Mahoney return -EPERM; 51302eaa055fSJeff Mahoney } 51312eaa055fSJeff Mahoney 51322eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51332eaa055fSJeff Mahoney if (disallowed) { 51343b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51353b02a68aSJeff Mahoney if (names) { 51363b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51373b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51383b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51393b02a68aSJeff Mahoney kfree(names); 51403b02a68aSJeff Mahoney } else 51412eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51422eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51432eaa055fSJeff Mahoney type, disallowed); 51442eaa055fSJeff Mahoney return -EPERM; 51452eaa055fSJeff Mahoney } 51462eaa055fSJeff Mahoney 51472eaa055fSJeff Mahoney return 0; 51482eaa055fSJeff Mahoney } 51492eaa055fSJeff Mahoney 51502eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 51513b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 51522eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51532eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51542eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51552eaa055fSJeff Mahoney 51562eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51572eaa055fSJeff Mahoney { 51582eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 51592eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 51602eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51612eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51622eaa055fSJeff Mahoney u64 newflags; 51632eaa055fSJeff Mahoney int ret; 51642eaa055fSJeff Mahoney 51652eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51662eaa055fSJeff Mahoney return -EPERM; 51672eaa055fSJeff Mahoney 51682eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51692eaa055fSJeff Mahoney return -EFAULT; 51702eaa055fSJeff Mahoney 51712eaa055fSJeff Mahoney /* Nothing to do */ 51722eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51732eaa055fSJeff Mahoney !flags[0].incompat_flags) 51742eaa055fSJeff Mahoney return 0; 51752eaa055fSJeff Mahoney 51762eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 51772eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51782eaa055fSJeff Mahoney if (ret) 51792eaa055fSJeff Mahoney return ret; 51802eaa055fSJeff Mahoney 51812eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 51822eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51832eaa055fSJeff Mahoney if (ret) 51842eaa055fSJeff Mahoney return ret; 51852eaa055fSJeff Mahoney 51862eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 51872eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51882eaa055fSJeff Mahoney if (ret) 51892eaa055fSJeff Mahoney return ret; 51902eaa055fSJeff Mahoney 51918051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51922eaa055fSJeff Mahoney if (IS_ERR(trans)) 51932eaa055fSJeff Mahoney return PTR_ERR(trans); 51942eaa055fSJeff Mahoney 51952eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 51962eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51972eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51982eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51992eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 52002eaa055fSJeff Mahoney 52012eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 52022eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 52032eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 52042eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 52052eaa055fSJeff Mahoney 52062eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 52072eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 52082eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 52092eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 52102eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 52112eaa055fSJeff Mahoney 5212d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 52132eaa055fSJeff Mahoney } 52142eaa055fSJeff Mahoney 5215f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5216f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5217f46b5a66SChristoph Hellwig { 5218496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52194bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5220f46b5a66SChristoph Hellwig 5221f46b5a66SChristoph Hellwig switch (cmd) { 52226cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 52236cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 52246cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 52256cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 52266cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 52276cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5228f7039b1dSLi Dongyang case FITRIM: 5229f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5230f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5231fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5232fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5233fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 52343de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5235fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 52366f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 52376f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 523876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 523976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 52400caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 52410caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 52420caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 52430caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 52446ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 52456ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5246f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 52471e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 52481e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 52491e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5250f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5251198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5252f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 52534bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5254f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5255da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5256475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5257475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5258475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5259475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5260f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 52619ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5262f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 5263c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 5264c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 52657a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 5266f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5267f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5268f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5269f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5270ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5271ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5272cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5273cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5274ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5275ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5276d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5277d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5278d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5279d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 52801406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 52811406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 52829b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 52839b199859SFilipe David Borba Manana int ret; 52849b199859SFilipe David Borba Manana 52856c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 52869b199859SFilipe David Borba Manana if (ret) 52879b199859SFilipe David Borba Manana return ret; 52889b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 52892fad4e83SDavid Sterba /* 52902fad4e83SDavid Sterba * The transaction thread may want to do more work, 52912fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 52922fad4e83SDavid Sterba * processing uncleaned subvols. 52932fad4e83SDavid Sterba */ 52942fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 52959b199859SFilipe David Borba Manana return ret; 52969b199859SFilipe David Borba Manana } 529746204592SSage Weil case BTRFS_IOC_START_SYNC: 52989a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 529946204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 53009a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5301475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5302b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5303475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5304475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5305475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5306475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5307c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 53089ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5309837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5310837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 531119a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 531219a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 53138ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 53148ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5315abccd00fSHugo Mills #ifdef CONFIG_64BIT 5316abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5317abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5318abccd00fSHugo Mills #endif 531931db9f7cSAlexander Block case BTRFS_IOC_SEND: 532031db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5321c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5322b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 53235d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5324905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 53255d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5326905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 53275d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5328905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 53295d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5330905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 53312f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 53322f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 53332f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 53342f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 533557254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 533657254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 53373f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 53383f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5339867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5340867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5341a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5342a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5343416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5344416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 53452eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 53462eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 53472eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 53482eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 53492eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 53502eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5351f46b5a66SChristoph Hellwig } 5352f46b5a66SChristoph Hellwig 5353f46b5a66SChristoph Hellwig return -ENOTTY; 5354f46b5a66SChristoph Hellwig } 5355