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 4834d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 4848e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4858e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4868e8a1e31SJosef Bacik goto fail; 4878e8a1e31SJosef Bacik } 488f46b5a66SChristoph Hellwig 4895d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 490f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 491f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4925d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 493f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 494f46b5a66SChristoph Hellwig 4950a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 496f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4975d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 498b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4995d4f98a2SYan Zheng BTRFS_UUID_SIZE); 500f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 501f46b5a66SChristoph Hellwig 5028ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 5038ea05e3aSAlexander Block 504f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5053cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5063cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5073cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 508707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 5093cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 510f46b5a66SChristoph Hellwig 5113cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5123cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5133cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 51408fe4db1SLi Zefan 515f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 51684234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 517f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 518f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 51986b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 52080ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 521f46b5a66SChristoph Hellwig 5228ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5238ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5248ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5258ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5263cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5273cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5288ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5298ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5308ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 531f46b5a66SChristoph Hellwig 532925baeddSChris Mason btrfs_tree_unlock(leaf); 533f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 534f46b5a66SChristoph Hellwig leaf = NULL; 535f46b5a66SChristoph Hellwig 536f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 537f46b5a66SChristoph Hellwig 538f46b5a66SChristoph Hellwig key.objectid = objectid; 5395d4f98a2SYan Zheng key.offset = 0; 540962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 541f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 542f46b5a66SChristoph Hellwig &root_item); 543f46b5a66SChristoph Hellwig if (ret) 544f46b5a66SChristoph Hellwig goto fail; 545f46b5a66SChristoph Hellwig 54676dda93cSYan, Zheng key.offset = (u64)-1; 54776dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 54879787eaaSJeff Mahoney if (IS_ERR(new_root)) { 54979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 55079787eaaSJeff Mahoney ret = PTR_ERR(new_root); 55179787eaaSJeff Mahoney goto fail; 55279787eaaSJeff Mahoney } 55376dda93cSYan, Zheng 55476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 55576dda93cSYan, Zheng 55663541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 557ce598979SMark Fasheh if (ret) { 558ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 55979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 560ce598979SMark Fasheh goto fail; 561ce598979SMark Fasheh } 562ce598979SMark Fasheh 563f46b5a66SChristoph Hellwig /* 564f46b5a66SChristoph Hellwig * insert the directory item 565f46b5a66SChristoph Hellwig */ 5663de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 56779787eaaSJeff Mahoney if (ret) { 56879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 56979787eaaSJeff Mahoney goto fail; 57079787eaaSJeff Mahoney } 5713de4586cSChris Mason 5723de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 57316cdcec7SMiao Xie name, namelen, dir, &key, 5743de4586cSChris Mason BTRFS_FT_DIR, index); 57579787eaaSJeff Mahoney if (ret) { 57679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 577f46b5a66SChristoph Hellwig goto fail; 57879787eaaSJeff Mahoney } 5790660b5afSChris Mason 58052c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 58152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 58252c26179SYan Zheng BUG_ON(ret); 58352c26179SYan Zheng 5840660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5854df27c4dSYan, Zheng objectid, root->root_key.objectid, 58633345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5870660b5afSChris Mason BUG_ON(ret); 5880660b5afSChris Mason 589dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 590dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 591dd5f9615SStefan Behrens objectid); 592dd5f9615SStefan Behrens if (ret) 593dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 594dd5f9615SStefan Behrens 595f46b5a66SChristoph Hellwig fail: 596d5c12070SMiao Xie trans->block_rsv = NULL; 597d5c12070SMiao Xie trans->bytes_reserved = 0; 598de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 599de6e8200SLiu Bo 60072fd032eSSage Weil if (async_transid) { 60172fd032eSSage Weil *async_transid = trans->transid; 60272fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 60300d71c9cSMiao Xie if (err) 60400d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 60572fd032eSSage Weil } else { 60676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 60772fd032eSSage Weil } 608f46b5a66SChristoph Hellwig if (err && !ret) 609f46b5a66SChristoph Hellwig ret = err; 6101a65e24bSChris Mason 6115662344bSTsutomu Itoh if (!ret) { 6125662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 613de6e8200SLiu Bo if (IS_ERR(inode)) 614de6e8200SLiu Bo return PTR_ERR(inode); 6155662344bSTsutomu Itoh d_instantiate(dentry, inode); 6165662344bSTsutomu Itoh } 617f46b5a66SChristoph Hellwig return ret; 618f46b5a66SChristoph Hellwig } 619f46b5a66SChristoph Hellwig 6209ea24bbeSFilipe Manana static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) 6218257b2dcSMiao Xie { 6228257b2dcSMiao Xie s64 writers; 6238257b2dcSMiao Xie DEFINE_WAIT(wait); 6248257b2dcSMiao Xie 6258257b2dcSMiao Xie do { 6268257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6278257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6288257b2dcSMiao Xie 6298257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6308257b2dcSMiao Xie if (writers) 6318257b2dcSMiao Xie schedule(); 6328257b2dcSMiao Xie 6338257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6348257b2dcSMiao Xie } while (writers); 6358257b2dcSMiao Xie } 6368257b2dcSMiao Xie 637e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 638e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 639e9662f70SMiao Xie u64 *async_transid, bool readonly, 640e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 641f46b5a66SChristoph Hellwig { 6422e4bfab9SYan, Zheng struct inode *inode; 643f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 644f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6452e4bfab9SYan, Zheng int ret; 646f46b5a66SChristoph Hellwig 64727cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 648f46b5a66SChristoph Hellwig return -EINVAL; 649f46b5a66SChristoph Hellwig 6508257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6514e857c58SPeter Zijlstra smp_mb__after_atomic(); 6529ea24bbeSFilipe Manana btrfs_wait_for_no_snapshoting_writes(root); 6538257b2dcSMiao Xie 6546a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6556a03843dSMiao Xie if (ret) 6568257b2dcSMiao Xie goto out; 6576a03843dSMiao Xie 658b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6596a03843dSMiao Xie 660a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 6618257b2dcSMiao Xie if (!pending_snapshot) { 6628257b2dcSMiao Xie ret = -ENOMEM; 6638257b2dcSMiao Xie goto out; 6648257b2dcSMiao Xie } 665a22285a6SYan, Zheng 66666d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 66766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 668d5c12070SMiao Xie /* 669d5c12070SMiao Xie * 1 - parent dir inode 670d5c12070SMiao Xie * 2 - dir entries 671d5c12070SMiao Xie * 1 - root item 672d5c12070SMiao Xie * 2 - root ref/backref 673d5c12070SMiao Xie * 1 - root of snapshot 674dd5f9615SStefan Behrens * 1 - UUID item 675d5c12070SMiao Xie */ 676d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 677dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 678ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 679ee3441b4SJeff Mahoney false); 680d5c12070SMiao Xie if (ret) 6818257b2dcSMiao Xie goto free; 682d5c12070SMiao Xie 683a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 684a22285a6SYan, Zheng pending_snapshot->root = root; 685b83cc969SLi Zefan pending_snapshot->readonly = readonly; 686e9662f70SMiao Xie pending_snapshot->dir = dir; 6878696c533SMiao Xie pending_snapshot->inherit = inherit; 688a22285a6SYan, Zheng 689d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 690a22285a6SYan, Zheng if (IS_ERR(trans)) { 691a22285a6SYan, Zheng ret = PTR_ERR(trans); 692a22285a6SYan, Zheng goto fail; 693a22285a6SYan, Zheng } 694a22285a6SYan, Zheng 6958351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 696a22285a6SYan, Zheng list_add(&pending_snapshot->list, 697a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6988351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 69972fd032eSSage Weil if (async_transid) { 70072fd032eSSage Weil *async_transid = trans->transid; 70172fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 70272fd032eSSage Weil root->fs_info->extent_root, 1); 70300d71c9cSMiao Xie if (ret) 70400d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 70572fd032eSSage Weil } else { 70672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 70772fd032eSSage Weil root->fs_info->extent_root); 70872fd032eSSage Weil } 709aec8030aSMiao Xie if (ret) 710c37b2b62SJosef Bacik goto fail; 711a22285a6SYan, Zheng 712a22285a6SYan, Zheng ret = pending_snapshot->error; 713f46b5a66SChristoph Hellwig if (ret) 7142e4bfab9SYan, Zheng goto fail; 715f46b5a66SChristoph Hellwig 716d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 717d3797308SChris Mason if (ret) 718d3797308SChris Mason goto fail; 719d3797308SChris Mason 7202fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 7212e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7222e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7232e4bfab9SYan, Zheng goto fail; 7242e4bfab9SYan, Zheng } 7255662344bSTsutomu Itoh 7262e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7272e4bfab9SYan, Zheng ret = 0; 7282e4bfab9SYan, Zheng fail: 729d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 730d5c12070SMiao Xie &pending_snapshot->block_rsv, 731d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 7328257b2dcSMiao Xie free: 733a22285a6SYan, Zheng kfree(pending_snapshot); 7348257b2dcSMiao Xie out: 7359ea24bbeSFilipe Manana if (atomic_dec_and_test(&root->will_be_snapshoted)) 7369ea24bbeSFilipe Manana wake_up_atomic_t(&root->will_be_snapshoted); 737f46b5a66SChristoph Hellwig return ret; 738f46b5a66SChristoph Hellwig } 739f46b5a66SChristoph Hellwig 7404260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7414260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7424260f7c7SSage Weil * whether the type of victim is right. 7434260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7444260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7454260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7464260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7474260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7484260f7c7SSage Weil * a. be owner of dir, or 7494260f7c7SSage Weil * b. be owner of victim, or 7504260f7c7SSage Weil * c. have CAP_FOWNER capability 7514260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7524260f7c7SSage Weil * links pointing to it. 7534260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7544260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7554260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7564260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7574260f7c7SSage Weil * nfs_async_unlink(). 7584260f7c7SSage Weil */ 7594260f7c7SSage Weil 7604260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7614260f7c7SSage Weil { 7624260f7c7SSage Weil int error; 7634260f7c7SSage Weil 7644260f7c7SSage Weil if (!victim->d_inode) 7654260f7c7SSage Weil return -ENOENT; 7664260f7c7SSage Weil 7674260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7684fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7694260f7c7SSage Weil 7704260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7714260f7c7SSage Weil if (error) 7724260f7c7SSage Weil return error; 7734260f7c7SSage Weil if (IS_APPEND(dir)) 7744260f7c7SSage Weil return -EPERM; 775cbdf35bcSMiklos Szeredi if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) || 7764260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7774260f7c7SSage Weil return -EPERM; 7784260f7c7SSage Weil if (isdir) { 779e36cb0b8SDavid Howells if (!d_is_dir(victim)) 7804260f7c7SSage Weil return -ENOTDIR; 7814260f7c7SSage Weil if (IS_ROOT(victim)) 7824260f7c7SSage Weil return -EBUSY; 783e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 7844260f7c7SSage Weil return -EISDIR; 7854260f7c7SSage Weil if (IS_DEADDIR(dir)) 7864260f7c7SSage Weil return -ENOENT; 7874260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7884260f7c7SSage Weil return -EBUSY; 7894260f7c7SSage Weil return 0; 7904260f7c7SSage Weil } 7914260f7c7SSage Weil 792cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 793cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 794cb8e7090SChristoph Hellwig { 795cb8e7090SChristoph Hellwig if (child->d_inode) 796cb8e7090SChristoph Hellwig return -EEXIST; 797cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 798cb8e7090SChristoph Hellwig return -ENOENT; 799cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 800cb8e7090SChristoph Hellwig } 801cb8e7090SChristoph Hellwig 802cb8e7090SChristoph Hellwig /* 803cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 804cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 805cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 806cb8e7090SChristoph Hellwig */ 80776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 80876dda93cSYan, Zheng char *name, int namelen, 80972fd032eSSage Weil struct btrfs_root *snap_src, 8106f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 812cb8e7090SChristoph Hellwig { 81376dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 814cb8e7090SChristoph Hellwig struct dentry *dentry; 815cb8e7090SChristoph Hellwig int error; 816cb8e7090SChristoph Hellwig 8175c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8185c50c9b8SDavid Sterba if (error == -EINTR) 8195c50c9b8SDavid Sterba return error; 820cb8e7090SChristoph Hellwig 821cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 822cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 823cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 824cb8e7090SChristoph Hellwig goto out_unlock; 825cb8e7090SChristoph Hellwig 826cb8e7090SChristoph Hellwig error = -EEXIST; 827cb8e7090SChristoph Hellwig if (dentry->d_inode) 828cb8e7090SChristoph Hellwig goto out_dput; 829cb8e7090SChristoph Hellwig 83076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 831cb8e7090SChristoph Hellwig if (error) 832a874a63eSLiu Bo goto out_dput; 833cb8e7090SChristoph Hellwig 8349c52057cSChris Mason /* 8359c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8369c52057cSChris Mason * check for them now when we can safely fail 8379c52057cSChris Mason */ 8389c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8399c52057cSChris Mason dir->i_ino, name, 8409c52057cSChris Mason namelen); 8419c52057cSChris Mason if (error) 8429c52057cSChris Mason goto out_dput; 8439c52057cSChris Mason 84476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 84576dda93cSYan, Zheng 84676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 84776dda93cSYan, Zheng goto out_up_read; 84876dda93cSYan, Zheng 8493de4586cSChris Mason if (snap_src) { 850e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8516f72c7e2SArne Jansen async_transid, readonly, inherit); 8523de4586cSChris Mason } else { 853d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 854d5c12070SMiao Xie async_transid, inherit); 8553de4586cSChris Mason } 85676dda93cSYan, Zheng if (!error) 85776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 85876dda93cSYan, Zheng out_up_read: 85976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 860cb8e7090SChristoph Hellwig out_dput: 861cb8e7090SChristoph Hellwig dput(dentry); 862cb8e7090SChristoph Hellwig out_unlock: 86376dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 864cb8e7090SChristoph Hellwig return error; 865cb8e7090SChristoph Hellwig } 866cb8e7090SChristoph Hellwig 8674cb5300bSChris Mason /* 8684cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8694cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8704cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8714cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8724cb5300bSChris Mason * part of the file 8734cb5300bSChris Mason */ 874aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 8754cb5300bSChris Mason { 8764cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8774cb5300bSChris Mason struct extent_map *em = NULL; 8784cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8794cb5300bSChris Mason u64 end; 8804cb5300bSChris Mason 8814cb5300bSChris Mason read_lock(&em_tree->lock); 8824cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8834cb5300bSChris Mason read_unlock(&em_tree->lock); 8844cb5300bSChris Mason 8854cb5300bSChris Mason if (em) { 8864cb5300bSChris Mason end = extent_map_end(em); 8874cb5300bSChris Mason free_extent_map(em); 8884cb5300bSChris Mason if (end - offset > thresh) 8894cb5300bSChris Mason return 0; 8904cb5300bSChris Mason } 8914cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 8924cb5300bSChris Mason thresh /= 2; 8934cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 8944cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 8954cb5300bSChris Mason if (end >= thresh) 8964cb5300bSChris Mason return 0; 8974cb5300bSChris Mason return 1; 8984cb5300bSChris Mason } 8994cb5300bSChris Mason 9004cb5300bSChris Mason /* 9014cb5300bSChris Mason * helper function to walk through a file and find extents 9024cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9034cb5300bSChris Mason * 9044cb5300bSChris Mason * This is used by the defragging code to find new and small 9054cb5300bSChris Mason * extents 9064cb5300bSChris Mason */ 9074cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9084cb5300bSChris Mason struct inode *inode, u64 newer_than, 909aab110abSDavid Sterba u64 *off, u32 thresh) 9104cb5300bSChris Mason { 9114cb5300bSChris Mason struct btrfs_path *path; 9124cb5300bSChris Mason struct btrfs_key min_key; 9134cb5300bSChris Mason struct extent_buffer *leaf; 9144cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9154cb5300bSChris Mason int type; 9164cb5300bSChris Mason int ret; 917a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9184cb5300bSChris Mason 9194cb5300bSChris Mason path = btrfs_alloc_path(); 9204cb5300bSChris Mason if (!path) 9214cb5300bSChris Mason return -ENOMEM; 9224cb5300bSChris Mason 923a4689d2bSDavid Sterba min_key.objectid = ino; 9244cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9254cb5300bSChris Mason min_key.offset = *off; 9264cb5300bSChris Mason 9274cb5300bSChris Mason while (1) { 9286174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9294cb5300bSChris Mason if (ret != 0) 9304cb5300bSChris Mason goto none; 931f094c9bdSFilipe Manana process_slot: 932a4689d2bSDavid Sterba if (min_key.objectid != ino) 9334cb5300bSChris Mason goto none; 9344cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9354cb5300bSChris Mason goto none; 9364cb5300bSChris Mason 9374cb5300bSChris Mason leaf = path->nodes[0]; 9384cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9394cb5300bSChris Mason struct btrfs_file_extent_item); 9404cb5300bSChris Mason 9414cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9424cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9434cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9444cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9454cb5300bSChris Mason *off = min_key.offset; 9464cb5300bSChris Mason btrfs_free_path(path); 9474cb5300bSChris Mason return 0; 9484cb5300bSChris Mason } 9494cb5300bSChris Mason 950f094c9bdSFilipe Manana path->slots[0]++; 951f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 952f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 953f094c9bdSFilipe Manana goto process_slot; 954f094c9bdSFilipe Manana } 955f094c9bdSFilipe Manana 9564cb5300bSChris Mason if (min_key.offset == (u64)-1) 9574cb5300bSChris Mason goto none; 9584cb5300bSChris Mason 9594cb5300bSChris Mason min_key.offset++; 9604cb5300bSChris Mason btrfs_release_path(path); 9614cb5300bSChris Mason } 9624cb5300bSChris Mason none: 9634cb5300bSChris Mason btrfs_free_path(path); 9644cb5300bSChris Mason return -ENOENT; 9654cb5300bSChris Mason } 9664cb5300bSChris Mason 9676c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 96817ce6ef8SLiu Bo { 96917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 970940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9716c282eb4SLi Zefan struct extent_map *em; 9726c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 973940100a4SChris Mason 974940100a4SChris Mason /* 975940100a4SChris Mason * hopefully we have this extent in the tree already, try without 976940100a4SChris Mason * the full extent lock 977940100a4SChris Mason */ 978940100a4SChris Mason read_lock(&em_tree->lock); 979940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 980940100a4SChris Mason read_unlock(&em_tree->lock); 981940100a4SChris Mason 982940100a4SChris Mason if (!em) { 983308d9800SFilipe Manana struct extent_state *cached = NULL; 984308d9800SFilipe Manana u64 end = start + len - 1; 985308d9800SFilipe Manana 986940100a4SChris Mason /* get the big lock and read metadata off disk */ 987308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 988940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 989308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 990940100a4SChris Mason 9916cf8bfbfSDan Carpenter if (IS_ERR(em)) 9926c282eb4SLi Zefan return NULL; 993940100a4SChris Mason } 994940100a4SChris Mason 9956c282eb4SLi Zefan return em; 9966c282eb4SLi Zefan } 9976c282eb4SLi Zefan 9986c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 9996c282eb4SLi Zefan { 10006c282eb4SLi Zefan struct extent_map *next; 10016c282eb4SLi Zefan bool ret = true; 10026c282eb4SLi Zefan 10036c282eb4SLi Zefan /* this is the last extent */ 10046c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10056c282eb4SLi Zefan return false; 10066c282eb4SLi Zefan 10076c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1008e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1009e9512d72SChris Mason ret = false; 1010e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1011e9512d72SChris Mason (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) 10126c282eb4SLi Zefan ret = false; 10136c282eb4SLi Zefan 10146c282eb4SLi Zefan free_extent_map(next); 10156c282eb4SLi Zefan return ret; 10166c282eb4SLi Zefan } 10176c282eb4SLi Zefan 1018aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1019a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1020a43a2111SAndrew Mahone int compress) 10216c282eb4SLi Zefan { 10226c282eb4SLi Zefan struct extent_map *em; 10236c282eb4SLi Zefan int ret = 1; 10246c282eb4SLi Zefan bool next_mergeable = true; 10256c282eb4SLi Zefan 10266c282eb4SLi Zefan /* 10276c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10286c282eb4SLi Zefan * defragging it 10296c282eb4SLi Zefan */ 10306c282eb4SLi Zefan if (start < *defrag_end) 10316c282eb4SLi Zefan return 1; 10326c282eb4SLi Zefan 10336c282eb4SLi Zefan *skip = 0; 10346c282eb4SLi Zefan 10356c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10366c282eb4SLi Zefan if (!em) 10376c282eb4SLi Zefan return 0; 10386c282eb4SLi Zefan 1039940100a4SChris Mason /* this will cover holes, and inline extents */ 104017ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1041940100a4SChris Mason ret = 0; 104217ce6ef8SLiu Bo goto out; 104317ce6ef8SLiu Bo } 104417ce6ef8SLiu Bo 10456c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1046940100a4SChris Mason /* 10476c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10486c282eb4SLi Zefan * real extent, don't bother defragging it 1049940100a4SChris Mason */ 1050a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10516c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1052940100a4SChris Mason ret = 0; 105317ce6ef8SLiu Bo out: 1054940100a4SChris Mason /* 1055940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1056940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1057940100a4SChris Mason * so that the next tiny extent will force a defrag. 1058940100a4SChris Mason * 1059940100a4SChris Mason * The end result of this is that tiny extents before a single big 1060940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1061940100a4SChris Mason */ 1062940100a4SChris Mason if (ret) { 1063940100a4SChris Mason *defrag_end = extent_map_end(em); 1064940100a4SChris Mason } else { 1065940100a4SChris Mason *last_len = 0; 1066940100a4SChris Mason *skip = extent_map_end(em); 1067940100a4SChris Mason *defrag_end = 0; 1068940100a4SChris Mason } 1069940100a4SChris Mason 1070940100a4SChris Mason free_extent_map(em); 1071940100a4SChris Mason return ret; 1072940100a4SChris Mason } 1073940100a4SChris Mason 10744cb5300bSChris Mason /* 10754cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10764cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10774cb5300bSChris Mason * to COW and defrag. 10784cb5300bSChris Mason * 10794cb5300bSChris Mason * It also makes sure the delalloc code has enough 10804cb5300bSChris Mason * dirty data to avoid making new small extents as part 10814cb5300bSChris Mason * of the defrag 10824cb5300bSChris Mason * 10834cb5300bSChris Mason * It's a good idea to start RA on this range 10844cb5300bSChris Mason * before calling this. 10854cb5300bSChris Mason */ 10864cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 10874cb5300bSChris Mason struct page **pages, 10884cb5300bSChris Mason unsigned long start_index, 1089c41570c9SJustin Maggard unsigned long num_pages) 1090f46b5a66SChristoph Hellwig { 10914cb5300bSChris Mason unsigned long file_end; 10924cb5300bSChris Mason u64 isize = i_size_read(inode); 1093f46b5a66SChristoph Hellwig u64 page_start; 1094f46b5a66SChristoph Hellwig u64 page_end; 10951f12bd06SLiu Bo u64 page_cnt; 10964cb5300bSChris Mason int ret; 10974cb5300bSChris Mason int i; 10984cb5300bSChris Mason int i_done; 10994cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11004cb5300bSChris Mason struct extent_state *cached_state = NULL; 1101600a45e1SMiao Xie struct extent_io_tree *tree; 11023b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11034cb5300bSChris Mason 11044cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11051f12bd06SLiu Bo if (!isize || start_index > file_end) 11061f12bd06SLiu Bo return 0; 11071f12bd06SLiu Bo 11081f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11094cb5300bSChris Mason 11104cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 11111f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11124cb5300bSChris Mason if (ret) 11134cb5300bSChris Mason return ret; 11144cb5300bSChris Mason i_done = 0; 1115600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11164cb5300bSChris Mason 11174cb5300bSChris Mason /* step one, lock all the pages */ 11181f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11194cb5300bSChris Mason struct page *page; 1120600a45e1SMiao Xie again: 1121a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11223b16a4e3SJosef Bacik start_index + i, mask); 11234cb5300bSChris Mason if (!page) 11244cb5300bSChris Mason break; 11254cb5300bSChris Mason 1126600a45e1SMiao Xie page_start = page_offset(page); 1127600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1128600a45e1SMiao Xie while (1) { 1129308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1130308d9800SFilipe Manana 0, &cached_state); 1131600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1132600a45e1SMiao Xie page_start); 1133308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1134308d9800SFilipe Manana &cached_state, GFP_NOFS); 1135600a45e1SMiao Xie if (!ordered) 1136600a45e1SMiao Xie break; 1137600a45e1SMiao Xie 1138600a45e1SMiao Xie unlock_page(page); 1139600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1140600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1141600a45e1SMiao Xie lock_page(page); 11421f12bd06SLiu Bo /* 11431f12bd06SLiu Bo * we unlocked the page above, so we need check if 11441f12bd06SLiu Bo * it was released or not. 11451f12bd06SLiu Bo */ 11461f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11471f12bd06SLiu Bo unlock_page(page); 11481f12bd06SLiu Bo page_cache_release(page); 11491f12bd06SLiu Bo goto again; 11501f12bd06SLiu Bo } 1151600a45e1SMiao Xie } 1152600a45e1SMiao Xie 11534cb5300bSChris Mason if (!PageUptodate(page)) { 11544cb5300bSChris Mason btrfs_readpage(NULL, page); 11554cb5300bSChris Mason lock_page(page); 11564cb5300bSChris Mason if (!PageUptodate(page)) { 11574cb5300bSChris Mason unlock_page(page); 11584cb5300bSChris Mason page_cache_release(page); 11594cb5300bSChris Mason ret = -EIO; 11604cb5300bSChris Mason break; 11614cb5300bSChris Mason } 11624cb5300bSChris Mason } 1163600a45e1SMiao Xie 1164600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1165600a45e1SMiao Xie unlock_page(page); 1166600a45e1SMiao Xie page_cache_release(page); 1167600a45e1SMiao Xie goto again; 1168600a45e1SMiao Xie } 1169600a45e1SMiao Xie 11704cb5300bSChris Mason pages[i] = page; 11714cb5300bSChris Mason i_done++; 11724cb5300bSChris Mason } 11734cb5300bSChris Mason if (!i_done || ret) 11744cb5300bSChris Mason goto out; 11754cb5300bSChris Mason 11764cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11774cb5300bSChris Mason goto out; 11784cb5300bSChris Mason 11794cb5300bSChris Mason /* 11804cb5300bSChris Mason * so now we have a nice long stream of locked 11814cb5300bSChris Mason * and up to date pages, lets wait on them 11824cb5300bSChris Mason */ 11834cb5300bSChris Mason for (i = 0; i < i_done; i++) 11844cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11854cb5300bSChris Mason 11864cb5300bSChris Mason page_start = page_offset(pages[0]); 11874cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 11884cb5300bSChris Mason 11894cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1190d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 11914cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 11924cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 11939e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 11949e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 11954cb5300bSChris Mason 11961f12bd06SLiu Bo if (i_done != page_cnt) { 11979e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 11989e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 11999e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12004cb5300bSChris Mason btrfs_delalloc_release_space(inode, 12011f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12024cb5300bSChris Mason } 12034cb5300bSChris Mason 12044cb5300bSChris Mason 12059e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12069e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12074cb5300bSChris Mason 12084cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12094cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12104cb5300bSChris Mason GFP_NOFS); 12114cb5300bSChris Mason 12124cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12134cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12144cb5300bSChris Mason ClearPageChecked(pages[i]); 12154cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12164cb5300bSChris Mason set_page_dirty(pages[i]); 12174cb5300bSChris Mason unlock_page(pages[i]); 12184cb5300bSChris Mason page_cache_release(pages[i]); 12194cb5300bSChris Mason } 12204cb5300bSChris Mason return i_done; 12214cb5300bSChris Mason out: 12224cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12234cb5300bSChris Mason unlock_page(pages[i]); 12244cb5300bSChris Mason page_cache_release(pages[i]); 12254cb5300bSChris Mason } 12261f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12274cb5300bSChris Mason return ret; 12284cb5300bSChris Mason 12294cb5300bSChris Mason } 12304cb5300bSChris Mason 12314cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12324cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12334cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12344cb5300bSChris Mason { 12354cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12364cb5300bSChris Mason struct file_ra_state *ra = NULL; 12374cb5300bSChris Mason unsigned long last_index; 1238151a31b2SLi Zefan u64 isize = i_size_read(inode); 1239940100a4SChris Mason u64 last_len = 0; 1240940100a4SChris Mason u64 skip = 0; 1241940100a4SChris Mason u64 defrag_end = 0; 12424cb5300bSChris Mason u64 newer_off = range->start; 1243f46b5a66SChristoph Hellwig unsigned long i; 1244008873eaSLi Zefan unsigned long ra_index = 0; 1245f46b5a66SChristoph Hellwig int ret; 12464cb5300bSChris Mason int defrag_count = 0; 12471a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1248aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 1249c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1250c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12514cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12524cb5300bSChris Mason struct page **pages = NULL; 12534cb5300bSChris Mason 12540abd5b17SLiu Bo if (isize == 0) 12550abd5b17SLiu Bo return 0; 12560abd5b17SLiu Bo 12570abd5b17SLiu Bo if (range->start >= isize) 12580abd5b17SLiu Bo return -EINVAL; 12591a419d85SLi Zefan 12601a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12611a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12621a419d85SLi Zefan return -EINVAL; 12631a419d85SLi Zefan if (range->compress_type) 12641a419d85SLi Zefan compress_type = range->compress_type; 12651a419d85SLi Zefan } 1266f46b5a66SChristoph Hellwig 12670abd5b17SLiu Bo if (extent_thresh == 0) 12680abd5b17SLiu Bo extent_thresh = 256 * 1024; 1269f46b5a66SChristoph Hellwig 12704cb5300bSChris Mason /* 12714cb5300bSChris Mason * if we were not given a file, allocate a readahead 12724cb5300bSChris Mason * context 12734cb5300bSChris Mason */ 12744cb5300bSChris Mason if (!file) { 12754cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12764cb5300bSChris Mason if (!ra) 12774cb5300bSChris Mason return -ENOMEM; 12784cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12794cb5300bSChris Mason } else { 12804cb5300bSChris Mason ra = &file->f_ra; 12814cb5300bSChris Mason } 12824cb5300bSChris Mason 1283d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12844cb5300bSChris Mason GFP_NOFS); 12854cb5300bSChris Mason if (!pages) { 12864cb5300bSChris Mason ret = -ENOMEM; 12874cb5300bSChris Mason goto out_ra; 12884cb5300bSChris Mason } 12894cb5300bSChris Mason 12904cb5300bSChris Mason /* find the last page to defrag */ 12911e701a32SChris Mason if (range->start + range->len > range->start) { 1292151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 12931e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 12941e701a32SChris Mason } else { 1295151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 12961e701a32SChris Mason } 12971e701a32SChris Mason 12984cb5300bSChris Mason if (newer_than) { 12994cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13004cb5300bSChris Mason &newer_off, 64 * 1024); 13014cb5300bSChris Mason if (!ret) { 13024cb5300bSChris Mason range->start = newer_off; 13034cb5300bSChris Mason /* 13044cb5300bSChris Mason * we always align our defrag to help keep 13054cb5300bSChris Mason * the extents in the file evenly spaced 13064cb5300bSChris Mason */ 13074cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13084cb5300bSChris Mason } else 13094cb5300bSChris Mason goto out_ra; 13104cb5300bSChris Mason } else { 13111e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13124cb5300bSChris Mason } 13134cb5300bSChris Mason if (!max_to_defrag) 13147ec31b54SLiu Bo max_to_defrag = last_index + 1; 13154cb5300bSChris Mason 13162a0f7f57SLi Zefan /* 13172a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13182a0f7f57SLi Zefan * written sequentially. 13192a0f7f57SLi Zefan */ 13202a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13212a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13222a0f7f57SLi Zefan 1323f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1324ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13254cb5300bSChris Mason /* 13264cb5300bSChris Mason * make sure we stop running if someone unmounts 13274cb5300bSChris Mason * the FS 13284cb5300bSChris Mason */ 13294cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13304cb5300bSChris Mason break; 13314cb5300bSChris Mason 1332210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1333efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1334210549ebSDavid Sterba ret = -EAGAIN; 1335210549ebSDavid Sterba break; 1336210549ebSDavid Sterba } 1337210549ebSDavid Sterba 133866c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13396c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1340a43a2111SAndrew Mahone &defrag_end, range->flags & 1341a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1342940100a4SChris Mason unsigned long next; 1343940100a4SChris Mason /* 1344940100a4SChris Mason * the should_defrag function tells us how much to skip 1345940100a4SChris Mason * bump our counter by the suggested amount 1346940100a4SChris Mason */ 1347ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1348940100a4SChris Mason i = max(i + 1, next); 1349940100a4SChris Mason continue; 1350940100a4SChris Mason } 1351008873eaSLi Zefan 1352008873eaSLi Zefan if (!newer_than) { 1353008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1354008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1355008873eaSLi Zefan cluster = min(cluster, max_cluster); 1356008873eaSLi Zefan } else { 1357008873eaSLi Zefan cluster = max_cluster; 1358008873eaSLi Zefan } 1359008873eaSLi Zefan 1360008873eaSLi Zefan if (i + cluster > ra_index) { 1361008873eaSLi Zefan ra_index = max(i, ra_index); 1362008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1363008873eaSLi Zefan cluster); 1364008873eaSLi Zefan ra_index += max_cluster; 1365008873eaSLi Zefan } 13664cb5300bSChris Mason 1367ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1368633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1369633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1370008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1371ecb8bea8SLiu Bo if (ret < 0) { 1372ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13734cb5300bSChris Mason goto out_ra; 1374ecb8bea8SLiu Bo } 13754cb5300bSChris Mason 13764cb5300bSChris Mason defrag_count += ret; 1377d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1378ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13794cb5300bSChris Mason 13804cb5300bSChris Mason if (newer_than) { 13814cb5300bSChris Mason if (newer_off == (u64)-1) 13824cb5300bSChris Mason break; 13834cb5300bSChris Mason 1384e1f041e1SLiu Bo if (ret > 0) 1385e1f041e1SLiu Bo i += ret; 1386e1f041e1SLiu Bo 13874cb5300bSChris Mason newer_off = max(newer_off + 1, 13884cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 13894cb5300bSChris Mason 13904cb5300bSChris Mason ret = find_new_extents(root, inode, 13914cb5300bSChris Mason newer_than, &newer_off, 13924cb5300bSChris Mason 64 * 1024); 13934cb5300bSChris Mason if (!ret) { 13944cb5300bSChris Mason range->start = newer_off; 13954cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13964cb5300bSChris Mason } else { 13974cb5300bSChris Mason break; 1398940100a4SChris Mason } 13994cb5300bSChris Mason } else { 1400008873eaSLi Zefan if (ret > 0) { 1401cbcc8326SLi Zefan i += ret; 1402008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1403008873eaSLi Zefan } else { 1404940100a4SChris Mason i++; 1405008873eaSLi Zefan last_len = 0; 1406008873eaSLi Zefan } 1407f46b5a66SChristoph Hellwig } 14084cb5300bSChris Mason } 1409f46b5a66SChristoph Hellwig 1410dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14111e701a32SChris Mason filemap_flush(inode->i_mapping); 1412dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1413dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1414dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1415dec8ef90SFilipe Manana } 14161e701a32SChris Mason 14171e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14181e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14191e701a32SChris Mason * we have to make sure the IO is actually started and that 14201e701a32SChris Mason * ordered extents get created before we return 14211e701a32SChris Mason */ 14221e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14231e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14241e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14251e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14261e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14271e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14281e701a32SChris Mason } 14291e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14301e701a32SChris Mason } 14311e701a32SChris Mason 14321a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14332b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14341a419d85SLi Zefan } 14351a419d85SLi Zefan 143660ccf82fSDiego Calleja ret = defrag_count; 1437940100a4SChris Mason 14384cb5300bSChris Mason out_ra: 1439633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1440633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1441633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1442633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1443633085c7SFilipe David Borba Manana } 14444cb5300bSChris Mason if (!file) 14454cb5300bSChris Mason kfree(ra); 14464cb5300bSChris Mason kfree(pages); 1447940100a4SChris Mason return ret; 1448f46b5a66SChristoph Hellwig } 1449f46b5a66SChristoph Hellwig 1450198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 145176dda93cSYan, Zheng void __user *arg) 1452f46b5a66SChristoph Hellwig { 1453f46b5a66SChristoph Hellwig u64 new_size; 1454f46b5a66SChristoph Hellwig u64 old_size; 1455f46b5a66SChristoph Hellwig u64 devid = 1; 1456496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1457f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1458f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1459f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1460f46b5a66SChristoph Hellwig char *sizestr; 14619a40f122SGui Hecheng char *retptr; 1462f46b5a66SChristoph Hellwig char *devstr = NULL; 1463f46b5a66SChristoph Hellwig int ret = 0; 1464f46b5a66SChristoph Hellwig int mod = 0; 1465f46b5a66SChristoph Hellwig 1466e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1467e441d54dSChris Mason return -EPERM; 1468e441d54dSChris Mason 1469198605a8SMiao Xie ret = mnt_want_write_file(file); 1470198605a8SMiao Xie if (ret) 1471198605a8SMiao Xie return ret; 1472198605a8SMiao Xie 14735ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14745ac00addSStefan Behrens 1)) { 147597547676SMiao Xie mnt_drop_write_file(file); 1476e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1477c9e9f97bSIlya Dryomov } 1478c9e9f97bSIlya Dryomov 14795ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1480dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1481c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1482c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1483c9e9f97bSIlya Dryomov goto out; 1484c9e9f97bSIlya Dryomov } 14855516e595SMark Fasheh 14865516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1487f46b5a66SChristoph Hellwig 1488f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1489f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1490f46b5a66SChristoph Hellwig if (devstr) { 1491f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1492f46b5a66SChristoph Hellwig *devstr = '\0'; 1493f46b5a66SChristoph Hellwig devstr = vol_args->name; 149458dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 149558dfae63SZhangZhen if (ret) 149658dfae63SZhangZhen goto out_free; 1497dfd79829SMiao Xie if (!devid) { 1498dfd79829SMiao Xie ret = -EINVAL; 1499dfd79829SMiao Xie goto out_free; 1500dfd79829SMiao Xie } 1501efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1502f46b5a66SChristoph Hellwig } 1503dba60f3fSMiao Xie 1504aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1505f46b5a66SChristoph Hellwig if (!device) { 1506efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1507c1c9ff7cSGeert Uytterhoeven devid); 1508dfd79829SMiao Xie ret = -ENODEV; 1509c9e9f97bSIlya Dryomov goto out_free; 1510f46b5a66SChristoph Hellwig } 1511dba60f3fSMiao Xie 1512dba60f3fSMiao Xie if (!device->writeable) { 1513efe120a0SFrank Holton btrfs_info(root->fs_info, 1514efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1515c1c9ff7cSGeert Uytterhoeven devid); 1516dfd79829SMiao Xie ret = -EPERM; 15174e42ae1bSLiu Bo goto out_free; 15184e42ae1bSLiu Bo } 15194e42ae1bSLiu Bo 1520f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1521f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1522f46b5a66SChristoph Hellwig else { 1523f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1524f46b5a66SChristoph Hellwig mod = -1; 1525f46b5a66SChristoph Hellwig sizestr++; 1526f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1527f46b5a66SChristoph Hellwig mod = 1; 1528f46b5a66SChristoph Hellwig sizestr++; 1529f46b5a66SChristoph Hellwig } 15309a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15319a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1532f46b5a66SChristoph Hellwig ret = -EINVAL; 1533c9e9f97bSIlya Dryomov goto out_free; 1534f46b5a66SChristoph Hellwig } 1535f46b5a66SChristoph Hellwig } 1536f46b5a66SChristoph Hellwig 153763a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1538dfd79829SMiao Xie ret = -EPERM; 153963a212abSStefan Behrens goto out_free; 154063a212abSStefan Behrens } 154163a212abSStefan Behrens 15427cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1543f46b5a66SChristoph Hellwig 1544f46b5a66SChristoph Hellwig if (mod < 0) { 1545f46b5a66SChristoph Hellwig if (new_size > old_size) { 1546f46b5a66SChristoph Hellwig ret = -EINVAL; 1547c9e9f97bSIlya Dryomov goto out_free; 1548f46b5a66SChristoph Hellwig } 1549f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1550f46b5a66SChristoph Hellwig } else if (mod > 0) { 1551eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1552902c68a4SGui Hecheng ret = -ERANGE; 1553eb8052e0SWenliang Fan goto out_free; 1554eb8052e0SWenliang Fan } 1555f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1556f46b5a66SChristoph Hellwig } 1557f46b5a66SChristoph Hellwig 1558f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1559f46b5a66SChristoph Hellwig ret = -EINVAL; 1560c9e9f97bSIlya Dryomov goto out_free; 1561f46b5a66SChristoph Hellwig } 1562f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1563f46b5a66SChristoph Hellwig ret = -EFBIG; 1564c9e9f97bSIlya Dryomov goto out_free; 1565f46b5a66SChristoph Hellwig } 1566f46b5a66SChristoph Hellwig 1567b8b93addSDavid Sterba new_size = div_u64(new_size, root->sectorsize); 1568f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1569f46b5a66SChristoph Hellwig 1570efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1571c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1572f46b5a66SChristoph Hellwig 1573f46b5a66SChristoph Hellwig if (new_size > old_size) { 1574a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 157598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 157698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1577c9e9f97bSIlya Dryomov goto out_free; 157898d5dc13STsutomu Itoh } 1579f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1580f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1581ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1582f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15830253f40eSjeff.liu } /* equal, nothing need to do */ 1584f46b5a66SChristoph Hellwig 1585c9e9f97bSIlya Dryomov out_free: 1586f46b5a66SChristoph Hellwig kfree(vol_args); 1587c9e9f97bSIlya Dryomov out: 1588c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 15895ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 159018f39c41SIlya Dryomov mnt_drop_write_file(file); 1591f46b5a66SChristoph Hellwig return ret; 1592f46b5a66SChristoph Hellwig } 1593f46b5a66SChristoph Hellwig 159472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 15956f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 15966f72c7e2SArne Jansen u64 *transid, bool readonly, 15978696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1598f46b5a66SChristoph Hellwig { 1599f46b5a66SChristoph Hellwig int namelen; 16003de4586cSChris Mason int ret = 0; 1601f46b5a66SChristoph Hellwig 1602a874a63eSLiu Bo ret = mnt_want_write_file(file); 1603a874a63eSLiu Bo if (ret) 1604a874a63eSLiu Bo goto out; 1605a874a63eSLiu Bo 160672fd032eSSage Weil namelen = strlen(name); 160772fd032eSSage Weil if (strchr(name, '/')) { 1608f46b5a66SChristoph Hellwig ret = -EINVAL; 1609a874a63eSLiu Bo goto out_drop_write; 1610f46b5a66SChristoph Hellwig } 1611f46b5a66SChristoph Hellwig 161216780cabSChris Mason if (name[0] == '.' && 161316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 161416780cabSChris Mason ret = -EEXIST; 1615a874a63eSLiu Bo goto out_drop_write; 161616780cabSChris Mason } 161716780cabSChris Mason 16183de4586cSChris Mason if (subvol) { 161972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16206f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1621cb8e7090SChristoph Hellwig } else { 16222903ff01SAl Viro struct fd src = fdget(fd); 16233de4586cSChris Mason struct inode *src_inode; 16242903ff01SAl Viro if (!src.file) { 16253de4586cSChris Mason ret = -EINVAL; 1626a874a63eSLiu Bo goto out_drop_write; 16273de4586cSChris Mason } 16283de4586cSChris Mason 1629496ad9aaSAl Viro src_inode = file_inode(src.file); 1630496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1631efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1632efe120a0SFrank Holton "Snapshot src from another FS"); 163323ad5b17SKusanagi Kouichi ret = -EXDEV; 1634d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1635d0242061SDavid Sterba /* 1636d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1637d0242061SDavid Sterba * are limited to own subvolumes only 1638d0242061SDavid Sterba */ 1639d0242061SDavid Sterba ret = -EPERM; 1640ecd18815SAl Viro } else { 164172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 164272fd032eSSage Weil BTRFS_I(src_inode)->root, 16436f72c7e2SArne Jansen transid, readonly, inherit); 1644ecd18815SAl Viro } 16452903ff01SAl Viro fdput(src); 1646cb8e7090SChristoph Hellwig } 1647a874a63eSLiu Bo out_drop_write: 1648a874a63eSLiu Bo mnt_drop_write_file(file); 1649f46b5a66SChristoph Hellwig out: 165072fd032eSSage Weil return ret; 165172fd032eSSage Weil } 165272fd032eSSage Weil 165372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1654fa0d2b9bSLi Zefan void __user *arg, int subvol) 165572fd032eSSage Weil { 1656fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 165772fd032eSSage Weil int ret; 165872fd032eSSage Weil 1659fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1660fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1661fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1662fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1663fa0d2b9bSLi Zefan 1664fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1665b83cc969SLi Zefan vol_args->fd, subvol, 16666f72c7e2SArne Jansen NULL, false, NULL); 1667fa0d2b9bSLi Zefan 1668fa0d2b9bSLi Zefan kfree(vol_args); 1669fa0d2b9bSLi Zefan return ret; 1670fa0d2b9bSLi Zefan } 1671fa0d2b9bSLi Zefan 1672fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1673fa0d2b9bSLi Zefan void __user *arg, int subvol) 1674fa0d2b9bSLi Zefan { 1675fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1676fa0d2b9bSLi Zefan int ret; 1677fdfb1e4fSLi Zefan u64 transid = 0; 1678fdfb1e4fSLi Zefan u64 *ptr = NULL; 1679b83cc969SLi Zefan bool readonly = false; 16806f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 168172fd032eSSage Weil 1682fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1683fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1684fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1685fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1686fdfb1e4fSLi Zefan 1687b83cc969SLi Zefan if (vol_args->flags & 16886f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 16896f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1690b83cc969SLi Zefan ret = -EOPNOTSUPP; 1691c47ca32dSDan Carpenter goto free_args; 1692fdfb1e4fSLi Zefan } 1693fdfb1e4fSLi Zefan 1694fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1695fdfb1e4fSLi Zefan ptr = &transid; 1696b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1697b83cc969SLi Zefan readonly = true; 16986f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 16996f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17006f72c7e2SArne Jansen ret = -EINVAL; 1701c47ca32dSDan Carpenter goto free_args; 17026f72c7e2SArne Jansen } 17036f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17046f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17056f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1706c47ca32dSDan Carpenter goto free_args; 17076f72c7e2SArne Jansen } 17086f72c7e2SArne Jansen } 170975eaa0e2SSage Weil 1710fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17116f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17128696c533SMiao Xie readonly, inherit); 1713c47ca32dSDan Carpenter if (ret) 1714c47ca32dSDan Carpenter goto free_inherit; 171575eaa0e2SSage Weil 1716c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1717fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1718c47ca32dSDan Carpenter transid), 1719c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 172075eaa0e2SSage Weil ret = -EFAULT; 1721c47ca32dSDan Carpenter 1722c47ca32dSDan Carpenter free_inherit: 17236f72c7e2SArne Jansen kfree(inherit); 1724c47ca32dSDan Carpenter free_args: 1725c47ca32dSDan Carpenter kfree(vol_args); 1726f46b5a66SChristoph Hellwig return ret; 1727f46b5a66SChristoph Hellwig } 1728f46b5a66SChristoph Hellwig 17290caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17300caa102dSLi Zefan void __user *arg) 17310caa102dSLi Zefan { 1732496ad9aaSAl Viro struct inode *inode = file_inode(file); 17330caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17340caa102dSLi Zefan int ret = 0; 17350caa102dSLi Zefan u64 flags = 0; 17360caa102dSLi Zefan 173733345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17380caa102dSLi Zefan return -EINVAL; 17390caa102dSLi Zefan 17400caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17410caa102dSLi Zefan if (btrfs_root_readonly(root)) 17420caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17430caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17440caa102dSLi Zefan 17450caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17460caa102dSLi Zefan ret = -EFAULT; 17470caa102dSLi Zefan 17480caa102dSLi Zefan return ret; 17490caa102dSLi Zefan } 17500caa102dSLi Zefan 17510caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17520caa102dSLi Zefan void __user *arg) 17530caa102dSLi Zefan { 1754496ad9aaSAl Viro struct inode *inode = file_inode(file); 17550caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17560caa102dSLi Zefan struct btrfs_trans_handle *trans; 17570caa102dSLi Zefan u64 root_flags; 17580caa102dSLi Zefan u64 flags; 17590caa102dSLi Zefan int ret = 0; 17600caa102dSLi Zefan 1761bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1762bd60ea0fSDavid Sterba return -EPERM; 1763bd60ea0fSDavid Sterba 1764b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1765b9ca0664SLiu Bo if (ret) 1766b9ca0664SLiu Bo goto out; 17670caa102dSLi Zefan 1768b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1769b9ca0664SLiu Bo ret = -EINVAL; 1770b9ca0664SLiu Bo goto out_drop_write; 1771b9ca0664SLiu Bo } 17720caa102dSLi Zefan 1773b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1774b9ca0664SLiu Bo ret = -EFAULT; 1775b9ca0664SLiu Bo goto out_drop_write; 1776b9ca0664SLiu Bo } 17770caa102dSLi Zefan 1778b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1779b9ca0664SLiu Bo ret = -EINVAL; 1780b9ca0664SLiu Bo goto out_drop_write; 1781b9ca0664SLiu Bo } 17820caa102dSLi Zefan 1783b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1784b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1785b9ca0664SLiu Bo goto out_drop_write; 1786b9ca0664SLiu Bo } 17870caa102dSLi Zefan 17880caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17890caa102dSLi Zefan 17900caa102dSLi Zefan /* nothing to do */ 17910caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1792b9ca0664SLiu Bo goto out_drop_sem; 17930caa102dSLi Zefan 17940caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 17952c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 17960caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 17970caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 17982c686537SDavid Sterba } else { 17992c686537SDavid Sterba /* 18002c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18012c686537SDavid Sterba * send 18022c686537SDavid Sterba */ 18032c686537SDavid Sterba spin_lock(&root->root_item_lock); 18042c686537SDavid Sterba if (root->send_in_progress == 0) { 18050caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18060caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18072c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18082c686537SDavid Sterba } else { 18092c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18102c686537SDavid Sterba btrfs_warn(root->fs_info, 18112c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18122c686537SDavid Sterba root->root_key.objectid); 18132c686537SDavid Sterba ret = -EPERM; 18142c686537SDavid Sterba goto out_drop_sem; 18152c686537SDavid Sterba } 18162c686537SDavid Sterba } 18170caa102dSLi Zefan 18180caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18190caa102dSLi Zefan if (IS_ERR(trans)) { 18200caa102dSLi Zefan ret = PTR_ERR(trans); 18210caa102dSLi Zefan goto out_reset; 18220caa102dSLi Zefan } 18230caa102dSLi Zefan 1824b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18250caa102dSLi Zefan &root->root_key, &root->root_item); 18260caa102dSLi Zefan 18270caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18280caa102dSLi Zefan out_reset: 18290caa102dSLi Zefan if (ret) 18300caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1831b9ca0664SLiu Bo out_drop_sem: 18320caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1833b9ca0664SLiu Bo out_drop_write: 1834b9ca0664SLiu Bo mnt_drop_write_file(file); 1835b9ca0664SLiu Bo out: 18360caa102dSLi Zefan return ret; 18370caa102dSLi Zefan } 18380caa102dSLi Zefan 183976dda93cSYan, Zheng /* 184076dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 184176dda93cSYan, Zheng */ 184276dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 184376dda93cSYan, Zheng { 184476dda93cSYan, Zheng struct btrfs_path *path; 1845175a2b87SJosef Bacik struct btrfs_dir_item *di; 184676dda93cSYan, Zheng struct btrfs_key key; 1847175a2b87SJosef Bacik u64 dir_id; 184876dda93cSYan, Zheng int ret; 184976dda93cSYan, Zheng 185076dda93cSYan, Zheng path = btrfs_alloc_path(); 185176dda93cSYan, Zheng if (!path) 185276dda93cSYan, Zheng return -ENOMEM; 185376dda93cSYan, Zheng 1854175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1855175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1856175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1857175a2b87SJosef Bacik dir_id, "default", 7, 0); 1858175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1859175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1860175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 186172de6b53SGuangyu Sun ret = -EPERM; 186272de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 186372de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1864175a2b87SJosef Bacik goto out; 1865175a2b87SJosef Bacik } 1866175a2b87SJosef Bacik btrfs_release_path(path); 1867175a2b87SJosef Bacik } 1868175a2b87SJosef Bacik 186976dda93cSYan, Zheng key.objectid = root->root_key.objectid; 187076dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 187176dda93cSYan, Zheng key.offset = (u64)-1; 187276dda93cSYan, Zheng 187376dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 187476dda93cSYan, Zheng &key, path, 0, 0); 187576dda93cSYan, Zheng if (ret < 0) 187676dda93cSYan, Zheng goto out; 187776dda93cSYan, Zheng BUG_ON(ret == 0); 187876dda93cSYan, Zheng 187976dda93cSYan, Zheng ret = 0; 188076dda93cSYan, Zheng if (path->slots[0] > 0) { 188176dda93cSYan, Zheng path->slots[0]--; 188276dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 188376dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 188476dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 188576dda93cSYan, Zheng ret = -ENOTEMPTY; 188676dda93cSYan, Zheng } 188776dda93cSYan, Zheng out: 188876dda93cSYan, Zheng btrfs_free_path(path); 188976dda93cSYan, Zheng return ret; 189076dda93cSYan, Zheng } 189176dda93cSYan, Zheng 1892ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1893ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1894ac8e9819SChris Mason { 1895abc6e134SChris Mason struct btrfs_key test; 1896abc6e134SChris Mason int ret; 1897abc6e134SChris Mason 1898abc6e134SChris Mason test.objectid = sk->min_objectid; 1899abc6e134SChris Mason test.type = sk->min_type; 1900abc6e134SChris Mason test.offset = sk->min_offset; 1901abc6e134SChris Mason 1902abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1903abc6e134SChris Mason if (ret < 0) 1904ac8e9819SChris Mason return 0; 1905abc6e134SChris Mason 1906abc6e134SChris Mason test.objectid = sk->max_objectid; 1907abc6e134SChris Mason test.type = sk->max_type; 1908abc6e134SChris Mason test.offset = sk->max_offset; 1909abc6e134SChris Mason 1910abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1911abc6e134SChris Mason if (ret > 0) 1912ac8e9819SChris Mason return 0; 1913ac8e9819SChris Mason return 1; 1914ac8e9819SChris Mason } 1915ac8e9819SChris Mason 1916ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1917ac8e9819SChris Mason struct btrfs_path *path, 1918ac8e9819SChris Mason struct btrfs_key *key, 1919ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19209b6e817dSGerhard Heift size_t *buf_size, 1921ba346b35SGerhard Heift char __user *ubuf, 1922ac8e9819SChris Mason unsigned long *sk_offset, 1923ac8e9819SChris Mason int *num_found) 1924ac8e9819SChris Mason { 1925ac8e9819SChris Mason u64 found_transid; 1926ac8e9819SChris Mason struct extent_buffer *leaf; 1927ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1928ac8e9819SChris Mason unsigned long item_off; 1929ac8e9819SChris Mason unsigned long item_len; 1930ac8e9819SChris Mason int nritems; 1931ac8e9819SChris Mason int i; 1932ac8e9819SChris Mason int slot; 1933ac8e9819SChris Mason int ret = 0; 1934ac8e9819SChris Mason 1935ac8e9819SChris Mason leaf = path->nodes[0]; 1936ac8e9819SChris Mason slot = path->slots[0]; 1937ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1938ac8e9819SChris Mason 1939ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1940ac8e9819SChris Mason i = nritems; 1941ac8e9819SChris Mason goto advance_key; 1942ac8e9819SChris Mason } 1943ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1944ac8e9819SChris Mason 1945ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1946ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1947ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1948ac8e9819SChris Mason 194903b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 195003b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 195103b71c6cSGabriel de Perthuis continue; 195203b71c6cSGabriel de Perthuis 19539b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19548f5f6178SGerhard Heift if (*num_found) { 1955ac8e9819SChris Mason ret = 1; 19568f5f6178SGerhard Heift goto out; 19578f5f6178SGerhard Heift } 19588f5f6178SGerhard Heift 19598f5f6178SGerhard Heift /* 19608f5f6178SGerhard Heift * return one empty item back for v1, which does not 19618f5f6178SGerhard Heift * handle -EOVERFLOW 19628f5f6178SGerhard Heift */ 19638f5f6178SGerhard Heift 19649b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1965ac8e9819SChris Mason item_len = 0; 19668f5f6178SGerhard Heift ret = -EOVERFLOW; 19678f5f6178SGerhard Heift } 1968ac8e9819SChris Mason 19699b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1970ac8e9819SChris Mason ret = 1; 197125c9bc2eSGerhard Heift goto out; 1972ac8e9819SChris Mason } 1973ac8e9819SChris Mason 1974ac8e9819SChris Mason sh.objectid = key->objectid; 1975ac8e9819SChris Mason sh.offset = key->offset; 1976ac8e9819SChris Mason sh.type = key->type; 1977ac8e9819SChris Mason sh.len = item_len; 1978ac8e9819SChris Mason sh.transid = found_transid; 1979ac8e9819SChris Mason 1980ac8e9819SChris Mason /* copy search result header */ 1981ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 1982ba346b35SGerhard Heift ret = -EFAULT; 1983ba346b35SGerhard Heift goto out; 1984ba346b35SGerhard Heift } 1985ba346b35SGerhard Heift 1986ac8e9819SChris Mason *sk_offset += sizeof(sh); 1987ac8e9819SChris Mason 1988ac8e9819SChris Mason if (item_len) { 1989ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1990ac8e9819SChris Mason /* copy the item */ 1991ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 1992ba346b35SGerhard Heift item_off, item_len)) { 1993ba346b35SGerhard Heift ret = -EFAULT; 1994ba346b35SGerhard Heift goto out; 1995ba346b35SGerhard Heift } 1996ba346b35SGerhard Heift 1997ac8e9819SChris Mason *sk_offset += item_len; 1998ac8e9819SChris Mason } 1999e2156867SHugo Mills (*num_found)++; 2000ac8e9819SChris Mason 20018f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20028f5f6178SGerhard Heift goto out; 20038f5f6178SGerhard Heift 200425c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 200525c9bc2eSGerhard Heift ret = 1; 200625c9bc2eSGerhard Heift goto out; 200725c9bc2eSGerhard Heift } 2008ac8e9819SChris Mason } 2009ac8e9819SChris Mason advance_key: 2010ac8e9819SChris Mason ret = 0; 2011abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 2012abc6e134SChris Mason key->offset++; 2013abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 2014abc6e134SChris Mason key->offset = 0; 2015abc6e134SChris Mason key->type++; 2016abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 2017abc6e134SChris Mason key->offset = 0; 2018abc6e134SChris Mason key->type = 0; 2019abc6e134SChris Mason key->objectid++; 2020abc6e134SChris Mason } else 2021abc6e134SChris Mason ret = 1; 202225c9bc2eSGerhard Heift out: 2023ba346b35SGerhard Heift /* 2024ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2025ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2026ba346b35SGerhard Heift * * all items were found 2027ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2028ba346b35SGerhard Heift * leaf 2029ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2030ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2031ba346b35SGerhard Heift */ 2032ac8e9819SChris Mason return ret; 2033ac8e9819SChris Mason } 2034ac8e9819SChris Mason 2035ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 203612544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20379b6e817dSGerhard Heift size_t *buf_size, 2038ba346b35SGerhard Heift char __user *ubuf) 2039ac8e9819SChris Mason { 2040ac8e9819SChris Mason struct btrfs_root *root; 2041ac8e9819SChris Mason struct btrfs_key key; 2042ac8e9819SChris Mason struct btrfs_path *path; 2043ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2044ac8e9819SChris Mason int ret; 2045ac8e9819SChris Mason int num_found = 0; 2046ac8e9819SChris Mason unsigned long sk_offset = 0; 2047ac8e9819SChris Mason 20489b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20499b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 205012544442SGerhard Heift return -EOVERFLOW; 20519b6e817dSGerhard Heift } 205212544442SGerhard Heift 2053ac8e9819SChris Mason path = btrfs_alloc_path(); 2054ac8e9819SChris Mason if (!path) 2055ac8e9819SChris Mason return -ENOMEM; 2056ac8e9819SChris Mason 2057ac8e9819SChris Mason if (sk->tree_id == 0) { 2058ac8e9819SChris Mason /* search the root of the inode that was passed */ 2059ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2060ac8e9819SChris Mason } else { 2061ac8e9819SChris Mason key.objectid = sk->tree_id; 2062ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2063ac8e9819SChris Mason key.offset = (u64)-1; 2064ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2065ac8e9819SChris Mason if (IS_ERR(root)) { 2066efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 2067ac8e9819SChris Mason sk->tree_id); 2068ac8e9819SChris Mason btrfs_free_path(path); 2069ac8e9819SChris Mason return -ENOENT; 2070ac8e9819SChris Mason } 2071ac8e9819SChris Mason } 2072ac8e9819SChris Mason 2073ac8e9819SChris Mason key.objectid = sk->min_objectid; 2074ac8e9819SChris Mason key.type = sk->min_type; 2075ac8e9819SChris Mason key.offset = sk->min_offset; 2076ac8e9819SChris Mason 2077ac8e9819SChris Mason while (1) { 20786174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2079ac8e9819SChris Mason if (ret != 0) { 2080ac8e9819SChris Mason if (ret > 0) 2081ac8e9819SChris Mason ret = 0; 2082ac8e9819SChris Mason goto err; 2083ac8e9819SChris Mason } 2084ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2085ac8e9819SChris Mason &sk_offset, &num_found); 2086b3b4aa74SDavid Sterba btrfs_release_path(path); 208725c9bc2eSGerhard Heift if (ret) 2088ac8e9819SChris Mason break; 2089ac8e9819SChris Mason 2090ac8e9819SChris Mason } 20918f5f6178SGerhard Heift if (ret > 0) 2092ac8e9819SChris Mason ret = 0; 2093ac8e9819SChris Mason err: 2094ac8e9819SChris Mason sk->nr_items = num_found; 2095ac8e9819SChris Mason btrfs_free_path(path); 2096ac8e9819SChris Mason return ret; 2097ac8e9819SChris Mason } 2098ac8e9819SChris Mason 2099ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2100ac8e9819SChris Mason void __user *argp) 2101ac8e9819SChris Mason { 2102ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2103ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2104ac8e9819SChris Mason struct inode *inode; 2105ac8e9819SChris Mason int ret; 21069b6e817dSGerhard Heift size_t buf_size; 2107ac8e9819SChris Mason 2108ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2109ac8e9819SChris Mason return -EPERM; 2110ac8e9819SChris Mason 2111ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2112ac8e9819SChris Mason 2113ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2114ba346b35SGerhard Heift return -EFAULT; 2115ba346b35SGerhard Heift 2116ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2117ac8e9819SChris Mason 2118496ad9aaSAl Viro inode = file_inode(file); 2119ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21208f5f6178SGerhard Heift 21218f5f6178SGerhard Heift /* 21228f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21238f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21248f5f6178SGerhard Heift */ 21258f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21268f5f6178SGerhard Heift ret = 0; 21278f5f6178SGerhard Heift 2128ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2129ac8e9819SChris Mason ret = -EFAULT; 2130ac8e9819SChris Mason return ret; 2131ac8e9819SChris Mason } 2132ac8e9819SChris Mason 2133cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2134cc68a8a5SGerhard Heift void __user *argp) 2135cc68a8a5SGerhard Heift { 2136cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2137cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2138cc68a8a5SGerhard Heift struct inode *inode; 2139cc68a8a5SGerhard Heift int ret; 2140cc68a8a5SGerhard Heift size_t buf_size; 2141cc68a8a5SGerhard Heift const size_t buf_limit = 16 * 1024 * 1024; 2142cc68a8a5SGerhard Heift 2143cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2144cc68a8a5SGerhard Heift return -EPERM; 2145cc68a8a5SGerhard Heift 2146cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2147cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2148cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2149cc68a8a5SGerhard Heift return -EFAULT; 2150cc68a8a5SGerhard Heift 2151cc68a8a5SGerhard Heift buf_size = args.buf_size; 2152cc68a8a5SGerhard Heift 2153cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2154cc68a8a5SGerhard Heift return -EOVERFLOW; 2155cc68a8a5SGerhard Heift 2156cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2157cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2158cc68a8a5SGerhard Heift buf_size = buf_limit; 2159cc68a8a5SGerhard Heift 2160cc68a8a5SGerhard Heift inode = file_inode(file); 2161cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2162cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2163cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2164cc68a8a5SGerhard Heift ret = -EFAULT; 2165cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2166cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2167cc68a8a5SGerhard Heift ret = -EFAULT; 2168cc68a8a5SGerhard Heift 216976dda93cSYan, Zheng return ret; 217076dda93cSYan, Zheng } 217176dda93cSYan, Zheng 217298d377a0STARUISI Hiroaki /* 2173ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2174ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 217598d377a0STARUISI Hiroaki */ 217698d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 217798d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 217898d377a0STARUISI Hiroaki { 217998d377a0STARUISI Hiroaki struct btrfs_root *root; 218098d377a0STARUISI Hiroaki struct btrfs_key key; 2181ac8e9819SChris Mason char *ptr; 218298d377a0STARUISI Hiroaki int ret = -1; 218398d377a0STARUISI Hiroaki int slot; 218498d377a0STARUISI Hiroaki int len; 218598d377a0STARUISI Hiroaki int total_len = 0; 218698d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 218798d377a0STARUISI Hiroaki struct extent_buffer *l; 218898d377a0STARUISI Hiroaki struct btrfs_path *path; 218998d377a0STARUISI Hiroaki 219098d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 219198d377a0STARUISI Hiroaki name[0]='\0'; 219298d377a0STARUISI Hiroaki return 0; 219398d377a0STARUISI Hiroaki } 219498d377a0STARUISI Hiroaki 219598d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 219698d377a0STARUISI Hiroaki if (!path) 219798d377a0STARUISI Hiroaki return -ENOMEM; 219898d377a0STARUISI Hiroaki 2199ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 220098d377a0STARUISI Hiroaki 220198d377a0STARUISI Hiroaki key.objectid = tree_id; 220298d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 220398d377a0STARUISI Hiroaki key.offset = (u64)-1; 220498d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 220598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2206efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 22078ad6fcabSChris Mason ret = -ENOENT; 22088ad6fcabSChris Mason goto out; 220998d377a0STARUISI Hiroaki } 221098d377a0STARUISI Hiroaki 221198d377a0STARUISI Hiroaki key.objectid = dirid; 221298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22138ad6fcabSChris Mason key.offset = (u64)-1; 221498d377a0STARUISI Hiroaki 221598d377a0STARUISI Hiroaki while (1) { 221698d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 221798d377a0STARUISI Hiroaki if (ret < 0) 221898d377a0STARUISI Hiroaki goto out; 221918674c6cSFilipe David Borba Manana else if (ret > 0) { 222018674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 222118674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 222218674c6cSFilipe David Borba Manana if (ret < 0) 222318674c6cSFilipe David Borba Manana goto out; 222418674c6cSFilipe David Borba Manana else if (ret > 0) { 2225ac8e9819SChris Mason ret = -ENOENT; 222698d377a0STARUISI Hiroaki goto out; 2227ac8e9819SChris Mason } 222818674c6cSFilipe David Borba Manana } 222918674c6cSFilipe David Borba Manana 223018674c6cSFilipe David Borba Manana l = path->nodes[0]; 223118674c6cSFilipe David Borba Manana slot = path->slots[0]; 223218674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 223398d377a0STARUISI Hiroaki 223498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 223598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 223698d377a0STARUISI Hiroaki ptr -= len + 1; 223798d377a0STARUISI Hiroaki total_len += len + 1; 2238a696cf35SFilipe David Borba Manana if (ptr < name) { 2239a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 224098d377a0STARUISI Hiroaki goto out; 2241a696cf35SFilipe David Borba Manana } 224298d377a0STARUISI Hiroaki 224398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 224498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 224598d377a0STARUISI Hiroaki 224698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 224798d377a0STARUISI Hiroaki break; 224898d377a0STARUISI Hiroaki 2249b3b4aa74SDavid Sterba btrfs_release_path(path); 225098d377a0STARUISI Hiroaki key.objectid = key.offset; 22518ad6fcabSChris Mason key.offset = (u64)-1; 225298d377a0STARUISI Hiroaki dirid = key.objectid; 225398d377a0STARUISI Hiroaki } 225477906a50SLi Zefan memmove(name, ptr, total_len); 225598d377a0STARUISI Hiroaki name[total_len] = '\0'; 225698d377a0STARUISI Hiroaki ret = 0; 225798d377a0STARUISI Hiroaki out: 225898d377a0STARUISI Hiroaki btrfs_free_path(path); 2259ac8e9819SChris Mason return ret; 2260ac8e9819SChris Mason } 2261ac8e9819SChris Mason 2262ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2263ac8e9819SChris Mason void __user *argp) 2264ac8e9819SChris Mason { 2265ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2266ac8e9819SChris Mason struct inode *inode; 2267ac8e9819SChris Mason int ret; 2268ac8e9819SChris Mason 2269ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2270ac8e9819SChris Mason return -EPERM; 2271ac8e9819SChris Mason 22722354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 22732354d08fSJulia Lawall if (IS_ERR(args)) 22742354d08fSJulia Lawall return PTR_ERR(args); 2275c2b96929SDan Carpenter 2276496ad9aaSAl Viro inode = file_inode(file); 2277ac8e9819SChris Mason 22781b53ac4dSChris Mason if (args->treeid == 0) 22791b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 22801b53ac4dSChris Mason 2281ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2282ac8e9819SChris Mason args->treeid, args->objectid, 2283ac8e9819SChris Mason args->name); 2284ac8e9819SChris Mason 2285ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2286ac8e9819SChris Mason ret = -EFAULT; 2287ac8e9819SChris Mason 2288ac8e9819SChris Mason kfree(args); 228998d377a0STARUISI Hiroaki return ret; 229098d377a0STARUISI Hiroaki } 229198d377a0STARUISI Hiroaki 229276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 229376dda93cSYan, Zheng void __user *arg) 229476dda93cSYan, Zheng { 229554563d41SAl Viro struct dentry *parent = file->f_path.dentry; 229676dda93cSYan, Zheng struct dentry *dentry; 229776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 229876dda93cSYan, Zheng struct inode *inode; 229976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 230076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 230176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 230276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2303c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2304521e0546SDavid Sterba u64 root_flags; 2305c58aaad2SMiao Xie u64 qgroup_reserved; 230676dda93cSYan, Zheng int namelen; 230776dda93cSYan, Zheng int ret; 230876dda93cSYan, Zheng int err = 0; 230976dda93cSYan, Zheng 231076dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 231176dda93cSYan, Zheng if (IS_ERR(vol_args)) 231276dda93cSYan, Zheng return PTR_ERR(vol_args); 231376dda93cSYan, Zheng 231476dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 231576dda93cSYan, Zheng namelen = strlen(vol_args->name); 231676dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 231776dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 231876dda93cSYan, Zheng err = -EINVAL; 231976dda93cSYan, Zheng goto out; 232076dda93cSYan, Zheng } 232176dda93cSYan, Zheng 2322a561be71SAl Viro err = mnt_want_write_file(file); 232376dda93cSYan, Zheng if (err) 232476dda93cSYan, Zheng goto out; 232576dda93cSYan, Zheng 2326521e0546SDavid Sterba 23275c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23285c50c9b8SDavid Sterba if (err == -EINTR) 2329e43f998eSDavid Sterba goto out_drop_write; 233076dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 233176dda93cSYan, Zheng if (IS_ERR(dentry)) { 233276dda93cSYan, Zheng err = PTR_ERR(dentry); 233376dda93cSYan, Zheng goto out_unlock_dir; 233476dda93cSYan, Zheng } 233576dda93cSYan, Zheng 233676dda93cSYan, Zheng if (!dentry->d_inode) { 233776dda93cSYan, Zheng err = -ENOENT; 233876dda93cSYan, Zheng goto out_dput; 233976dda93cSYan, Zheng } 234076dda93cSYan, Zheng 234176dda93cSYan, Zheng inode = dentry->d_inode; 23424260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23434260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23444260f7c7SSage Weil /* 23454260f7c7SSage Weil * Regular user. Only allow this with a special mount 23464260f7c7SSage Weil * option, when the user has write+exec access to the 23474260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23484260f7c7SSage Weil * allowed. 23494260f7c7SSage Weil * 23504260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23514260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23524260f7c7SSage Weil * otherwise be able to delete. 23534260f7c7SSage Weil * 23544260f7c7SSage Weil * Users who want to delete empty subvols should try 23554260f7c7SSage Weil * rmdir(2). 23564260f7c7SSage Weil */ 23574260f7c7SSage Weil err = -EPERM; 23584260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 23594260f7c7SSage Weil goto out_dput; 23604260f7c7SSage Weil 23614260f7c7SSage Weil /* 23624260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 23634260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 23644260f7c7SSage Weil * must be called on the dentry referencing the root 23654260f7c7SSage Weil * of the subvol, not a random directory contained 23664260f7c7SSage Weil * within it. 23674260f7c7SSage Weil */ 23684260f7c7SSage Weil err = -EINVAL; 23694260f7c7SSage Weil if (root == dest) 23704260f7c7SSage Weil goto out_dput; 23714260f7c7SSage Weil 23724260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 23734260f7c7SSage Weil if (err) 23744260f7c7SSage Weil goto out_dput; 23755c39da5bSMiao Xie } 23764260f7c7SSage Weil 23775c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 23784260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 23794260f7c7SSage Weil if (err) 23804260f7c7SSage Weil goto out_dput; 23814260f7c7SSage Weil 238233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 238376dda93cSYan, Zheng err = -EINVAL; 238476dda93cSYan, Zheng goto out_dput; 238576dda93cSYan, Zheng } 238676dda93cSYan, Zheng 238776dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 2388521e0546SDavid Sterba 2389521e0546SDavid Sterba /* 2390521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2391521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2392521e0546SDavid Sterba * again is not run concurrently. 2393521e0546SDavid Sterba */ 2394521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2395c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2396c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2397c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2398521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2399521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2400521e0546SDavid Sterba } else { 2401521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2402521e0546SDavid Sterba btrfs_warn(root->fs_info, 2403521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2404c55bfa67SFilipe Manana dest->root_key.objectid); 2405521e0546SDavid Sterba err = -EPERM; 2406521e0546SDavid Sterba goto out_dput; 2407521e0546SDavid Sterba } 2408521e0546SDavid Sterba 24095542aa2fSEric W. Biederman d_invalidate(dentry); 241076dda93cSYan, Zheng 241176dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 241276dda93cSYan, Zheng 241376dda93cSYan, Zheng err = may_destroy_subvol(dest); 241476dda93cSYan, Zheng if (err) 241576dda93cSYan, Zheng goto out_up_write; 241676dda93cSYan, Zheng 2417c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2418c58aaad2SMiao Xie /* 2419c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2420c58aaad2SMiao Xie * ref/backref. 2421c58aaad2SMiao Xie */ 2422c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2423ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2424c58aaad2SMiao Xie if (err) 2425c58aaad2SMiao Xie goto out_up_write; 2426c58aaad2SMiao Xie 2427a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2428a22285a6SYan, Zheng if (IS_ERR(trans)) { 2429a22285a6SYan, Zheng err = PTR_ERR(trans); 2430c58aaad2SMiao Xie goto out_release; 2431a22285a6SYan, Zheng } 2432c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2433c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2434a22285a6SYan, Zheng 243576dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 243676dda93cSYan, Zheng dest->root_key.objectid, 243776dda93cSYan, Zheng dentry->d_name.name, 243876dda93cSYan, Zheng dentry->d_name.len); 243979787eaaSJeff Mahoney if (ret) { 244079787eaaSJeff Mahoney err = ret; 244179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 244279787eaaSJeff Mahoney goto out_end_trans; 244379787eaaSJeff Mahoney } 244476dda93cSYan, Zheng 244576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 244676dda93cSYan, Zheng 244776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 244876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 244976dda93cSYan, Zheng dest->root_item.drop_level = 0; 245076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 245176dda93cSYan, Zheng 245227cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 245376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 245476dda93cSYan, Zheng root->fs_info->tree_root, 245576dda93cSYan, Zheng dest->root_key.objectid); 245679787eaaSJeff Mahoney if (ret) { 245779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 245879787eaaSJeff Mahoney err = ret; 245979787eaaSJeff Mahoney goto out_end_trans; 2460d68fc57bSYan, Zheng } 246179787eaaSJeff Mahoney } 2462dd5f9615SStefan Behrens 2463dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2464dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2465dd5f9615SStefan Behrens dest->root_key.objectid); 2466dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2467dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2468dd5f9615SStefan Behrens err = ret; 2469dd5f9615SStefan Behrens goto out_end_trans; 2470dd5f9615SStefan Behrens } 2471dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2472dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2473dd5f9615SStefan Behrens dest->root_item.received_uuid, 2474dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2475dd5f9615SStefan Behrens dest->root_key.objectid); 2476dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2477dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2478dd5f9615SStefan Behrens err = ret; 2479dd5f9615SStefan Behrens goto out_end_trans; 2480dd5f9615SStefan Behrens } 2481dd5f9615SStefan Behrens } 2482dd5f9615SStefan Behrens 248379787eaaSJeff Mahoney out_end_trans: 2484c58aaad2SMiao Xie trans->block_rsv = NULL; 2485c58aaad2SMiao Xie trans->bytes_reserved = 0; 2486531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 248779787eaaSJeff Mahoney if (ret && !err) 248879787eaaSJeff Mahoney err = ret; 248976dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2490c58aaad2SMiao Xie out_release: 2491c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 249276dda93cSYan, Zheng out_up_write: 249376dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 2494521e0546SDavid Sterba if (err) { 2495521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2496c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2497c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2498521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2499521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2500521e0546SDavid Sterba } 250176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 250276dda93cSYan, Zheng if (!err) { 2503efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 250476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 250576dda93cSYan, Zheng d_delete(dentry); 250661155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2507fa6ac876SLiu Bo 2508fa6ac876SLiu Bo /* the last ref */ 250957cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 251057cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 251157cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2512fa6ac876SLiu Bo } 251376dda93cSYan, Zheng } 251476dda93cSYan, Zheng out_dput: 251576dda93cSYan, Zheng dput(dentry); 251676dda93cSYan, Zheng out_unlock_dir: 251776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2518e43f998eSDavid Sterba out_drop_write: 25192a79f17eSAl Viro mnt_drop_write_file(file); 252076dda93cSYan, Zheng out: 252176dda93cSYan, Zheng kfree(vol_args); 252276dda93cSYan, Zheng return err; 252376dda93cSYan, Zheng } 252476dda93cSYan, Zheng 25251e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2526f46b5a66SChristoph Hellwig { 2527496ad9aaSAl Viro struct inode *inode = file_inode(file); 2528f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25291e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2530c146afadSYan Zheng int ret; 2531c146afadSYan Zheng 253225122d15SIlya Dryomov ret = mnt_want_write_file(file); 253325122d15SIlya Dryomov if (ret) 253425122d15SIlya Dryomov return ret; 2535b83cc969SLi Zefan 253625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 253725122d15SIlya Dryomov ret = -EROFS; 253825122d15SIlya Dryomov goto out; 25395ac00addSStefan Behrens } 2540f46b5a66SChristoph Hellwig 2541f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2542f46b5a66SChristoph Hellwig case S_IFDIR: 2543e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2544e441d54dSChris Mason ret = -EPERM; 2545e441d54dSChris Mason goto out; 2546e441d54dSChris Mason } 2547de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25488929ecfaSYan, Zheng if (ret) 25498929ecfaSYan, Zheng goto out; 2550de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2551f46b5a66SChristoph Hellwig break; 2552f46b5a66SChristoph Hellwig case S_IFREG: 2553e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2554e441d54dSChris Mason ret = -EINVAL; 2555e441d54dSChris Mason goto out; 2556e441d54dSChris Mason } 25571e701a32SChris Mason 25581e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 25591e701a32SChris Mason if (!range) { 25601e701a32SChris Mason ret = -ENOMEM; 25611e701a32SChris Mason goto out; 25621e701a32SChris Mason } 25631e701a32SChris Mason 25641e701a32SChris Mason if (argp) { 25651e701a32SChris Mason if (copy_from_user(range, argp, 25661e701a32SChris Mason sizeof(*range))) { 25671e701a32SChris Mason ret = -EFAULT; 25681e701a32SChris Mason kfree(range); 2569683be16eSDan Carpenter goto out; 25701e701a32SChris Mason } 25711e701a32SChris Mason /* compression requires us to start the IO */ 25721e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 25731e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 25741e701a32SChris Mason range->extent_thresh = (u32)-1; 25751e701a32SChris Mason } 25761e701a32SChris Mason } else { 25771e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 25781e701a32SChris Mason range->len = (u64)-1; 25791e701a32SChris Mason } 2580496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 25814cb5300bSChris Mason range, 0, 0); 25824cb5300bSChris Mason if (ret > 0) 25834cb5300bSChris Mason ret = 0; 25841e701a32SChris Mason kfree(range); 2585f46b5a66SChristoph Hellwig break; 25868929ecfaSYan, Zheng default: 25878929ecfaSYan, Zheng ret = -EINVAL; 2588f46b5a66SChristoph Hellwig } 2589e441d54dSChris Mason out: 259025122d15SIlya Dryomov mnt_drop_write_file(file); 2591e441d54dSChris Mason return ret; 2592f46b5a66SChristoph Hellwig } 2593f46b5a66SChristoph Hellwig 2594b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2595f46b5a66SChristoph Hellwig { 2596f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2597f46b5a66SChristoph Hellwig int ret; 2598f46b5a66SChristoph Hellwig 2599e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2600e441d54dSChris Mason return -EPERM; 2601e441d54dSChris Mason 26025ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26035ac00addSStefan Behrens 1)) { 2604e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2605c9e9f97bSIlya Dryomov } 2606c9e9f97bSIlya Dryomov 26075ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2608dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2609c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2610c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2611c9e9f97bSIlya Dryomov goto out; 2612c9e9f97bSIlya Dryomov } 2613f46b5a66SChristoph Hellwig 26145516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2615f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2616f46b5a66SChristoph Hellwig 261743d20761SAnand Jain if (!ret) 261843d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 261943d20761SAnand Jain 2620f46b5a66SChristoph Hellwig kfree(vol_args); 2621c9e9f97bSIlya Dryomov out: 2622c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26235ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2624f46b5a66SChristoph Hellwig return ret; 2625f46b5a66SChristoph Hellwig } 2626f46b5a66SChristoph Hellwig 2627da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2628f46b5a66SChristoph Hellwig { 2629496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2630f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2631f46b5a66SChristoph Hellwig int ret; 2632f46b5a66SChristoph Hellwig 2633e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2634e441d54dSChris Mason return -EPERM; 2635e441d54dSChris Mason 2636da24927bSMiao Xie ret = mnt_want_write_file(file); 2637da24927bSMiao Xie if (ret) 2638da24927bSMiao Xie return ret; 2639c146afadSYan Zheng 2640dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2641c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2642c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2643c47ca32dSDan Carpenter goto err_drop; 2644c9e9f97bSIlya Dryomov } 2645f46b5a66SChristoph Hellwig 26465516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2647f46b5a66SChristoph Hellwig 2648183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2649183860f6SAnand Jain 1)) { 2650183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2651183860f6SAnand Jain goto out; 2652183860f6SAnand Jain } 2653183860f6SAnand Jain 2654183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2655183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2656c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26575ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2658183860f6SAnand Jain 2659ec95d491SAnand Jain if (!ret) 2660ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2661ec95d491SAnand Jain 2662183860f6SAnand Jain out: 2663183860f6SAnand Jain kfree(vol_args); 2664c47ca32dSDan Carpenter err_drop: 26654ac20c70SIlya Dryomov mnt_drop_write_file(file); 2666f46b5a66SChristoph Hellwig return ret; 2667f46b5a66SChristoph Hellwig } 2668f46b5a66SChristoph Hellwig 2669475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2670475f6387SJan Schmidt { 2671027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2672475f6387SJan Schmidt struct btrfs_device *device; 2673475f6387SJan Schmidt struct btrfs_device *next; 2674475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2675027ed2f0SLi Zefan int ret = 0; 2676475f6387SJan Schmidt 2677027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2678027ed2f0SLi Zefan if (!fi_args) 2679027ed2f0SLi Zefan return -ENOMEM; 2680027ed2f0SLi Zefan 2681f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2682027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2683027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2684475f6387SJan Schmidt 2685475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2686027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2687027ed2f0SLi Zefan fi_args->max_id = device->devid; 2688475f6387SJan Schmidt } 2689475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2690475f6387SJan Schmidt 269180a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 269280a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 269380a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 269480a773fbSDavid Sterba 2695027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2696027ed2f0SLi Zefan ret = -EFAULT; 2697475f6387SJan Schmidt 2698027ed2f0SLi Zefan kfree(fi_args); 2699027ed2f0SLi Zefan return ret; 2700475f6387SJan Schmidt } 2701475f6387SJan Schmidt 2702475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2703475f6387SJan Schmidt { 2704475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2705475f6387SJan Schmidt struct btrfs_device *dev; 2706475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2707475f6387SJan Schmidt int ret = 0; 2708475f6387SJan Schmidt char *s_uuid = NULL; 2709475f6387SJan Schmidt 2710475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2711475f6387SJan Schmidt if (IS_ERR(di_args)) 2712475f6387SJan Schmidt return PTR_ERR(di_args); 2713475f6387SJan Schmidt 2714dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2715475f6387SJan Schmidt s_uuid = di_args->uuid; 2716475f6387SJan Schmidt 2717475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2718aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2719475f6387SJan Schmidt 2720475f6387SJan Schmidt if (!dev) { 2721475f6387SJan Schmidt ret = -ENODEV; 2722475f6387SJan Schmidt goto out; 2723475f6387SJan Schmidt } 2724475f6387SJan Schmidt 2725475f6387SJan Schmidt di_args->devid = dev->devid; 27267cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27277cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2728475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2729a27202fbSJim Meyering if (dev->name) { 2730606686eeSJosef Bacik struct rcu_string *name; 2731606686eeSJosef Bacik 2732606686eeSJosef Bacik rcu_read_lock(); 2733606686eeSJosef Bacik name = rcu_dereference(dev->name); 2734606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2735606686eeSJosef Bacik rcu_read_unlock(); 2736a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2737a27202fbSJim Meyering } else { 273899ba55adSStefan Behrens di_args->path[0] = '\0'; 2739a27202fbSJim Meyering } 2740475f6387SJan Schmidt 2741475f6387SJan Schmidt out: 274255793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2743475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2744475f6387SJan Schmidt ret = -EFAULT; 2745475f6387SJan Schmidt 2746475f6387SJan Schmidt kfree(di_args); 2747475f6387SJan Schmidt return ret; 2748475f6387SJan Schmidt } 2749475f6387SJan Schmidt 2750416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2751416161dbSMark Fasheh { 2752416161dbSMark Fasheh struct page *page; 2753416161dbSMark Fasheh pgoff_t index; 2754416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2755416161dbSMark Fasheh 2756416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2757416161dbSMark Fasheh 2758416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2759416161dbSMark Fasheh if (!page) 2760416161dbSMark Fasheh return NULL; 2761416161dbSMark Fasheh 2762416161dbSMark Fasheh if (!PageUptodate(page)) { 2763416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2764416161dbSMark Fasheh 0)) 2765416161dbSMark Fasheh return NULL; 2766416161dbSMark Fasheh lock_page(page); 2767416161dbSMark Fasheh if (!PageUptodate(page)) { 2768416161dbSMark Fasheh unlock_page(page); 2769416161dbSMark Fasheh page_cache_release(page); 2770416161dbSMark Fasheh return NULL; 2771416161dbSMark Fasheh } 2772416161dbSMark Fasheh } 2773416161dbSMark Fasheh unlock_page(page); 2774416161dbSMark Fasheh 2775416161dbSMark Fasheh return page; 2776416161dbSMark Fasheh } 2777416161dbSMark Fasheh 277877fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 277977fe20dcSMark Fasheh { 278077fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 278177fe20dcSMark Fasheh another, and lock file content */ 278277fe20dcSMark Fasheh while (1) { 278377fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 278477fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 278577fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 278677fe20dcSMark Fasheh off + len - 1); 2787ff5df9b8SFilipe Manana if ((!ordered || 2788ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2789ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 279077fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2791ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2792ff5df9b8SFilipe Manana if (ordered) 2793ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 279477fe20dcSMark Fasheh break; 2795ff5df9b8SFilipe Manana } 279677fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 279777fe20dcSMark Fasheh if (ordered) 279877fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 279977fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 280077fe20dcSMark Fasheh } 280177fe20dcSMark Fasheh } 280277fe20dcSMark Fasheh 2803416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2804416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2805416161dbSMark Fasheh { 2806416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2807416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2808416161dbSMark Fasheh 2809416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2810416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2811416161dbSMark Fasheh } 2812416161dbSMark Fasheh 2813416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2814416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2815416161dbSMark Fasheh { 2816416161dbSMark Fasheh if (inode1 < inode2) { 2817416161dbSMark Fasheh swap(inode1, inode2); 2818416161dbSMark Fasheh swap(loff1, loff2); 2819416161dbSMark Fasheh } 2820416161dbSMark Fasheh 2821416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2822416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2823416161dbSMark Fasheh if (inode1 != inode2) { 2824416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2825416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2826416161dbSMark Fasheh } 2827416161dbSMark Fasheh } 2828416161dbSMark Fasheh 2829416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2830416161dbSMark Fasheh u64 dst_loff, u64 len) 2831416161dbSMark Fasheh { 2832416161dbSMark Fasheh int ret = 0; 2833416161dbSMark Fasheh struct page *src_page, *dst_page; 2834416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2835416161dbSMark Fasheh void *addr, *dst_addr; 2836416161dbSMark Fasheh 2837416161dbSMark Fasheh while (len) { 2838416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2839416161dbSMark Fasheh cmp_len = len; 2840416161dbSMark Fasheh 2841416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2842416161dbSMark Fasheh if (!src_page) 2843416161dbSMark Fasheh return -EINVAL; 2844416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2845416161dbSMark Fasheh if (!dst_page) { 2846416161dbSMark Fasheh page_cache_release(src_page); 2847416161dbSMark Fasheh return -EINVAL; 2848416161dbSMark Fasheh } 2849416161dbSMark Fasheh addr = kmap_atomic(src_page); 2850416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2851416161dbSMark Fasheh 2852416161dbSMark Fasheh flush_dcache_page(src_page); 2853416161dbSMark Fasheh flush_dcache_page(dst_page); 2854416161dbSMark Fasheh 2855416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2856416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2857416161dbSMark Fasheh 2858416161dbSMark Fasheh kunmap_atomic(addr); 2859416161dbSMark Fasheh kunmap_atomic(dst_addr); 2860416161dbSMark Fasheh page_cache_release(src_page); 2861416161dbSMark Fasheh page_cache_release(dst_page); 2862416161dbSMark Fasheh 2863416161dbSMark Fasheh if (ret) 2864416161dbSMark Fasheh break; 2865416161dbSMark Fasheh 2866416161dbSMark Fasheh loff += cmp_len; 2867416161dbSMark Fasheh dst_loff += cmp_len; 2868416161dbSMark Fasheh len -= cmp_len; 2869416161dbSMark Fasheh } 2870416161dbSMark Fasheh 2871416161dbSMark Fasheh return ret; 2872416161dbSMark Fasheh } 2873416161dbSMark Fasheh 2874416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2875416161dbSMark Fasheh { 2876416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2877416161dbSMark Fasheh 2878416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2879416161dbSMark Fasheh return -EINVAL; 2880416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2881416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2882416161dbSMark Fasheh return -EINVAL; 2883416161dbSMark Fasheh 2884416161dbSMark Fasheh return 0; 2885416161dbSMark Fasheh } 2886416161dbSMark Fasheh 2887416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2888416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2889416161dbSMark Fasheh { 2890416161dbSMark Fasheh int ret; 2891416161dbSMark Fasheh 2892416161dbSMark Fasheh /* 2893416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2894416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2895416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2896416161dbSMark Fasheh */ 2897416161dbSMark Fasheh if (src == dst) 2898416161dbSMark Fasheh return -EINVAL; 2899416161dbSMark Fasheh 2900113e8283SFilipe Manana if (len == 0) 2901113e8283SFilipe Manana return 0; 2902113e8283SFilipe Manana 2903416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2904416161dbSMark Fasheh 2905416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2906416161dbSMark Fasheh if (ret) 2907416161dbSMark Fasheh goto out_unlock; 2908416161dbSMark Fasheh 2909416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2910416161dbSMark Fasheh if (ret) 2911416161dbSMark Fasheh goto out_unlock; 2912416161dbSMark Fasheh 2913416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2914416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2915416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2916416161dbSMark Fasheh ret = -EINVAL; 2917416161dbSMark Fasheh goto out_unlock; 2918416161dbSMark Fasheh } 2919416161dbSMark Fasheh 2920416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2921416161dbSMark Fasheh if (ret == 0) 2922416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2923416161dbSMark Fasheh 2924416161dbSMark Fasheh out_unlock: 2925416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2926416161dbSMark Fasheh 2927416161dbSMark Fasheh return ret; 2928416161dbSMark Fasheh } 2929416161dbSMark Fasheh 2930416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2931416161dbSMark Fasheh 2932416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 29331c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 2934416161dbSMark Fasheh { 2935cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2936cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 29371c1c8747SAl Viro struct inode *src = file_inode(file); 2938416161dbSMark Fasheh u64 off; 2939416161dbSMark Fasheh u64 len; 2940416161dbSMark Fasheh int i; 2941416161dbSMark Fasheh int ret; 2942cbf8b8caSMark Fasheh unsigned long size; 2943416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2944416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 29451c1c8747SAl Viro u16 count; 2946416161dbSMark Fasheh 2947416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2948416161dbSMark Fasheh return -EINVAL; 2949416161dbSMark Fasheh 2950416161dbSMark Fasheh ret = mnt_want_write_file(file); 2951416161dbSMark Fasheh if (ret) 2952416161dbSMark Fasheh return ret; 2953416161dbSMark Fasheh 29541c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 2955416161dbSMark Fasheh ret = -EFAULT; 2956416161dbSMark Fasheh goto out; 2957416161dbSMark Fasheh } 2958416161dbSMark Fasheh 29591c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 2960cbf8b8caSMark Fasheh 29611c1c8747SAl Viro same = memdup_user(argp, size); 2962cbf8b8caSMark Fasheh 2963229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2964229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2965cbf8b8caSMark Fasheh goto out; 2966cbf8b8caSMark Fasheh } 2967cbf8b8caSMark Fasheh 2968cbf8b8caSMark Fasheh off = same->logical_offset; 2969cbf8b8caSMark Fasheh len = same->length; 2970416161dbSMark Fasheh 2971416161dbSMark Fasheh /* 2972416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2973416161dbSMark Fasheh * This is intended to bound the total time spent in this 2974416161dbSMark Fasheh * ioctl to something sane. 2975416161dbSMark Fasheh */ 2976416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2977416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2978416161dbSMark Fasheh 2979416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2980416161dbSMark Fasheh /* 2981416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2982416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2983416161dbSMark Fasheh * this situation without an update. 2984416161dbSMark Fasheh */ 2985416161dbSMark Fasheh ret = -EINVAL; 2986416161dbSMark Fasheh goto out; 2987416161dbSMark Fasheh } 2988416161dbSMark Fasheh 2989416161dbSMark Fasheh ret = -EISDIR; 2990416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2991416161dbSMark Fasheh goto out; 2992416161dbSMark Fasheh 2993416161dbSMark Fasheh ret = -EACCES; 2994416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2995416161dbSMark Fasheh goto out; 2996416161dbSMark Fasheh 2997cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 29981c1c8747SAl Viro for (i = 0; i < count; i++) { 2999cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 3000cbf8b8caSMark Fasheh same->info[i].status = 0; 3001416161dbSMark Fasheh } 3002416161dbSMark Fasheh 30031c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 30041c1c8747SAl Viro struct inode *dst; 30051c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 30061c1c8747SAl Viro if (!dst_file.file) { 3007cbf8b8caSMark Fasheh info->status = -EBADF; 30081c1c8747SAl Viro continue; 3009416161dbSMark Fasheh } 30101c1c8747SAl Viro dst = file_inode(dst_file.file); 3011416161dbSMark Fasheh 30121c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 3013cbf8b8caSMark Fasheh info->status = -EINVAL; 30141c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 3015cbf8b8caSMark Fasheh info->status = -EXDEV; 30161c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 3017cbf8b8caSMark Fasheh info->status = -EISDIR; 30181c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 3019cbf8b8caSMark Fasheh info->status = -EACCES; 30201c1c8747SAl Viro } else { 3021cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 3022cbf8b8caSMark Fasheh info->logical_offset); 3023cbf8b8caSMark Fasheh if (info->status == 0) 3024cbf8b8caSMark Fasheh info->bytes_deduped += len; 30251c1c8747SAl Viro } 30261c1c8747SAl Viro fdput(dst_file); 3027cbf8b8caSMark Fasheh } 3028416161dbSMark Fasheh 3029cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 3030cbf8b8caSMark Fasheh if (ret) 3031416161dbSMark Fasheh ret = -EFAULT; 3032416161dbSMark Fasheh 3033416161dbSMark Fasheh out: 3034416161dbSMark Fasheh mnt_drop_write_file(file); 3035416161dbSMark Fasheh return ret; 3036416161dbSMark Fasheh } 3037416161dbSMark Fasheh 3038fcebe456SJosef Bacik /* Helper to check and see if this root currently has a ref on the given disk 3039fcebe456SJosef Bacik * bytenr. If it does then we need to update the quota for this root. This 3040fcebe456SJosef Bacik * doesn't do anything if quotas aren't enabled. 3041fcebe456SJosef Bacik */ 3042fcebe456SJosef Bacik static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3043fcebe456SJosef Bacik u64 disko) 3044fcebe456SJosef Bacik { 30453284da7bSDavid Sterba struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem); 3046fcebe456SJosef Bacik struct ulist *roots; 3047fcebe456SJosef Bacik struct ulist_iterator uiter; 3048fcebe456SJosef Bacik struct ulist_node *root_node = NULL; 3049fcebe456SJosef Bacik int ret; 3050fcebe456SJosef Bacik 3051fcebe456SJosef Bacik if (!root->fs_info->quota_enabled) 3052fcebe456SJosef Bacik return 1; 3053fcebe456SJosef Bacik 3054fcebe456SJosef Bacik btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3055fcebe456SJosef Bacik ret = btrfs_find_all_roots(trans, root->fs_info, disko, 3056fcebe456SJosef Bacik tree_mod_seq_elem.seq, &roots); 3057fcebe456SJosef Bacik if (ret < 0) 3058fcebe456SJosef Bacik goto out; 3059fcebe456SJosef Bacik ret = 0; 3060fcebe456SJosef Bacik ULIST_ITER_INIT(&uiter); 3061fcebe456SJosef Bacik while ((root_node = ulist_next(roots, &uiter))) { 3062fcebe456SJosef Bacik if (root_node->val == root->objectid) { 3063fcebe456SJosef Bacik ret = 1; 3064fcebe456SJosef Bacik break; 3065fcebe456SJosef Bacik } 3066fcebe456SJosef Bacik } 3067fcebe456SJosef Bacik ulist_free(roots); 3068fcebe456SJosef Bacik out: 3069fcebe456SJosef Bacik btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3070fcebe456SJosef Bacik return ret; 3071fcebe456SJosef Bacik } 3072fcebe456SJosef Bacik 3073f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3074f82a9901SFilipe Manana struct inode *inode, 3075f82a9901SFilipe Manana u64 endoff, 3076f82a9901SFilipe Manana const u64 destoff, 3077f82a9901SFilipe Manana const u64 olen) 3078f82a9901SFilipe Manana { 3079f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3080f82a9901SFilipe Manana int ret; 3081f82a9901SFilipe Manana 3082f82a9901SFilipe Manana inode_inc_iversion(inode); 3083f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3084f82a9901SFilipe Manana /* 3085f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3086f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3087f82a9901SFilipe Manana */ 3088f82a9901SFilipe Manana if (endoff > destoff + olen) 3089f82a9901SFilipe Manana endoff = destoff + olen; 3090f82a9901SFilipe Manana if (endoff > inode->i_size) 3091f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3092f82a9901SFilipe Manana 3093f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3094f82a9901SFilipe Manana if (ret) { 3095f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3096f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3097f82a9901SFilipe Manana goto out; 3098f82a9901SFilipe Manana } 3099f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3100f82a9901SFilipe Manana out: 3101f82a9901SFilipe Manana return ret; 3102f82a9901SFilipe Manana } 3103f82a9901SFilipe Manana 31047ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 31057ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 31067ffbb598SFilipe Manana const struct btrfs_path *path, 31077ffbb598SFilipe Manana const u64 hole_offset, 31087ffbb598SFilipe Manana const u64 hole_len) 31097ffbb598SFilipe Manana { 31107ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 31117ffbb598SFilipe Manana struct extent_map *em; 31127ffbb598SFilipe Manana int ret; 31137ffbb598SFilipe Manana 31147ffbb598SFilipe Manana em = alloc_extent_map(); 31157ffbb598SFilipe Manana if (!em) { 31167ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31177ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31187ffbb598SFilipe Manana return; 31197ffbb598SFilipe Manana } 31207ffbb598SFilipe Manana 312114f59796SFilipe Manana if (path) { 312214f59796SFilipe Manana struct btrfs_file_extent_item *fi; 312314f59796SFilipe Manana 312414f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 312514f59796SFilipe Manana struct btrfs_file_extent_item); 31267ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 31277ffbb598SFilipe Manana em->generation = -1; 31287ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 31297ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 31307ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31317ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31327ffbb598SFilipe Manana } else { 31337ffbb598SFilipe Manana em->start = hole_offset; 31347ffbb598SFilipe Manana em->len = hole_len; 31357ffbb598SFilipe Manana em->ram_bytes = em->len; 31367ffbb598SFilipe Manana em->orig_start = hole_offset; 31377ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 31387ffbb598SFilipe Manana em->block_len = 0; 31397ffbb598SFilipe Manana em->orig_block_len = 0; 31407ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 31417ffbb598SFilipe Manana em->generation = trans->transid; 31427ffbb598SFilipe Manana } 31437ffbb598SFilipe Manana 31447ffbb598SFilipe Manana while (1) { 31457ffbb598SFilipe Manana write_lock(&em_tree->lock); 31467ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 31477ffbb598SFilipe Manana write_unlock(&em_tree->lock); 31487ffbb598SFilipe Manana if (ret != -EEXIST) { 31497ffbb598SFilipe Manana free_extent_map(em); 31507ffbb598SFilipe Manana break; 31517ffbb598SFilipe Manana } 31527ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 31537ffbb598SFilipe Manana em->start + em->len - 1, 0); 31547ffbb598SFilipe Manana } 31557ffbb598SFilipe Manana 3156ee39b432SDavid Sterba if (ret) 31577ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31587ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31597ffbb598SFilipe Manana } 31607ffbb598SFilipe Manana 316132b7c687SMark Fasheh /** 316232b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 316332b7c687SMark Fasheh * 316432b7c687SMark Fasheh * @src: Inode to clone from 316532b7c687SMark Fasheh * @inode: Inode to clone to 316632b7c687SMark Fasheh * @off: Offset within source to start clone from 316732b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 316832b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 316932b7c687SMark Fasheh * identical values here 317032b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 317132b7c687SMark Fasheh */ 317232b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3173f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 3174f82a9901SFilipe Manana const u64 destoff) 3175f46b5a66SChristoph Hellwig { 3176f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 317732b7c687SMark Fasheh struct btrfs_path *path = NULL; 3178f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 317932b7c687SMark Fasheh struct btrfs_trans_handle *trans; 318032b7c687SMark Fasheh char *buf = NULL; 3181ae01a0abSYan Zheng struct btrfs_key key; 3182f46b5a66SChristoph Hellwig u32 nritems; 3183f46b5a66SChristoph Hellwig int slot; 3184ae01a0abSYan Zheng int ret; 3185fcebe456SJosef Bacik int no_quota; 3186f82a9901SFilipe Manana const u64 len = olen_aligned; 3187fcebe456SJosef Bacik u64 last_disko = 0; 3188f82a9901SFilipe Manana u64 last_dest_end = destoff; 3189ae01a0abSYan Zheng 3190ae01a0abSYan Zheng ret = -ENOMEM; 3191707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3192ae01a0abSYan Zheng if (!buf) 319332b7c687SMark Fasheh return ret; 3194ae01a0abSYan Zheng 3195ae01a0abSYan Zheng path = btrfs_alloc_path(); 3196ae01a0abSYan Zheng if (!path) { 3197ae01a0abSYan Zheng vfree(buf); 319832b7c687SMark Fasheh return ret; 3199ae01a0abSYan Zheng } 320032b7c687SMark Fasheh 3201ae01a0abSYan Zheng path->reada = 2; 3202c5c9cd4dSSage Weil /* clone data */ 320333345d01SLi Zefan key.objectid = btrfs_ino(src); 3204ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 32052c463823SFilipe Manana key.offset = off; 3206f46b5a66SChristoph Hellwig 3207f46b5a66SChristoph Hellwig while (1) { 3208*de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3209df858e76SFilipe Manana 3210f46b5a66SChristoph Hellwig /* 3211f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3212f46b5a66SChristoph Hellwig * tree. 3213f46b5a66SChristoph Hellwig */ 3214e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3215362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3216362a20c5SDavid Sterba 0, 0); 3217f46b5a66SChristoph Hellwig if (ret < 0) 3218f46b5a66SChristoph Hellwig goto out; 32192c463823SFilipe Manana /* 32202c463823SFilipe Manana * First search, if no extent item that starts at offset off was 32212c463823SFilipe Manana * found but the previous item is an extent item, it's possible 32222c463823SFilipe Manana * it might overlap our target range, therefore process it. 32232c463823SFilipe Manana */ 32242c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 32252c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 32262c463823SFilipe Manana path->slots[0] - 1); 32272c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 32282c463823SFilipe Manana path->slots[0]--; 32292c463823SFilipe Manana } 3230f46b5a66SChristoph Hellwig 3231ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3232e4355f34SFilipe David Borba Manana process_slot: 3233fcebe456SJosef Bacik no_quota = 1; 3234ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3235362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3236f46b5a66SChristoph Hellwig if (ret < 0) 3237f46b5a66SChristoph Hellwig goto out; 3238f46b5a66SChristoph Hellwig if (ret > 0) 3239f46b5a66SChristoph Hellwig break; 3240ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3241f46b5a66SChristoph Hellwig } 3242f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3243f46b5a66SChristoph Hellwig slot = path->slots[0]; 3244f46b5a66SChristoph Hellwig 3245ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3246962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 324733345d01SLi Zefan key.objectid != btrfs_ino(src)) 3248f46b5a66SChristoph Hellwig break; 3249f46b5a66SChristoph Hellwig 3250962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3251c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3252c5c9cd4dSSage Weil int type; 325331840ae1SZheng Yan u32 size; 325431840ae1SZheng Yan struct btrfs_key new_key; 3255c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3256c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3257c5c9cd4dSSage Weil u8 comp; 3258f82a9901SFilipe Manana u64 drop_start; 325931840ae1SZheng Yan 3260c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3261c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3262c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3263c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3264c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3265c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3266d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3267d397712bSChris Mason extent); 3268d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3269d397712bSChris Mason extent); 3270c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3271d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3272d397712bSChris Mason extent); 3273c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3274c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3275c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3276c5c9cd4dSSage Weil extent); 3277c5c9cd4dSSage Weil } 327831840ae1SZheng Yan 32792c463823SFilipe Manana /* 32802c463823SFilipe Manana * The first search might have left us at an extent 32812c463823SFilipe Manana * item that ends before our target range's start, can 32822c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 32832c463823SFilipe Manana */ 32842c463823SFilipe Manana if (key.offset + datal <= off) { 3285e4355f34SFilipe David Borba Manana path->slots[0]++; 3286e4355f34SFilipe David Borba Manana goto process_slot; 32872c463823SFilipe Manana } else if (key.offset >= off + len) { 32882c463823SFilipe Manana break; 3289e4355f34SFilipe David Borba Manana } 3290df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3291e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3292e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3293e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3294e4355f34SFilipe David Borba Manana size); 3295e4355f34SFilipe David Borba Manana 3296e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3297e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3298c5c9cd4dSSage Weil 329931840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 330033345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 33014d728ec7SLi Zefan if (off <= key.offset) 3302c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 33034d728ec7SLi Zefan else 33044d728ec7SLi Zefan new_key.offset = destoff; 3305c5c9cd4dSSage Weil 3306b6f3409bSSage Weil /* 3307f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3308f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3309f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3310f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3311f82a9901SFilipe Manana * partially overlaps it). 3312f82a9901SFilipe Manana */ 3313f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3314f82a9901SFilipe Manana drop_start = last_dest_end; 3315f82a9901SFilipe Manana else 3316f82a9901SFilipe Manana drop_start = new_key.offset; 3317f82a9901SFilipe Manana 3318f82a9901SFilipe Manana /* 3319b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3320b6f3409bSSage Weil * 1 - add new extent 3321b6f3409bSSage Weil * 1 - inode update 3322b6f3409bSSage Weil */ 3323b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3324a22285a6SYan, Zheng if (IS_ERR(trans)) { 3325a22285a6SYan, Zheng ret = PTR_ERR(trans); 3326a22285a6SYan, Zheng goto out; 3327a22285a6SYan, Zheng } 3328a22285a6SYan, Zheng 3329c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3330c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3331d72c0842SLi Zefan /* 3332d72c0842SLi Zefan * a | --- range to clone ---| b 3333d72c0842SLi Zefan * | ------------- extent ------------- | 3334d72c0842SLi Zefan */ 3335d72c0842SLi Zefan 333693915584SAntonio Ospite /* subtract range b */ 3337d72c0842SLi Zefan if (key.offset + datal > off + len) 3338d72c0842SLi Zefan datal = off + len - key.offset; 3339d72c0842SLi Zefan 334093915584SAntonio Ospite /* subtract range a */ 3341a22285a6SYan, Zheng if (off > key.offset) { 3342a22285a6SYan, Zheng datao += off - key.offset; 3343a22285a6SYan, Zheng datal -= off - key.offset; 3344a22285a6SYan, Zheng } 3345a22285a6SYan, Zheng 33465dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3347f82a9901SFilipe Manana drop_start, 3348a22285a6SYan, Zheng new_key.offset + datal, 33492671485dSJosef Bacik 1); 335079787eaaSJeff Mahoney if (ret) { 33513f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 335200fdf13aSLiu Bo btrfs_abort_transaction(trans, 335300fdf13aSLiu Bo root, ret); 335479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 335579787eaaSJeff Mahoney goto out; 335679787eaaSJeff Mahoney } 3357a22285a6SYan, Zheng 335831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 335931840ae1SZheng Yan &new_key, size); 336079787eaaSJeff Mahoney if (ret) { 336179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 336279787eaaSJeff Mahoney ret); 336379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 336479787eaaSJeff Mahoney goto out; 336579787eaaSJeff Mahoney } 336631840ae1SZheng Yan 336731840ae1SZheng Yan leaf = path->nodes[0]; 336831840ae1SZheng Yan slot = path->slots[0]; 336931840ae1SZheng Yan write_extent_buffer(leaf, buf, 337031840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 337131840ae1SZheng Yan size); 3372ae01a0abSYan Zheng 3373f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3374f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3375c5c9cd4dSSage Weil 3376c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3377c5c9cd4dSSage Weil if (!disko) 3378c5c9cd4dSSage Weil datao = 0; 3379c5c9cd4dSSage Weil 3380c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3381c5c9cd4dSSage Weil datao); 3382c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3383c5c9cd4dSSage Weil datal); 3384fcebe456SJosef Bacik 3385fcebe456SJosef Bacik /* 3386fcebe456SJosef Bacik * We need to look up the roots that point at 3387fcebe456SJosef Bacik * this bytenr and see if the new root does. If 3388fcebe456SJosef Bacik * it does not we need to make sure we update 3389fcebe456SJosef Bacik * quotas appropriately. 3390fcebe456SJosef Bacik */ 3391fcebe456SJosef Bacik if (disko && root != BTRFS_I(src)->root && 3392fcebe456SJosef Bacik disko != last_disko) { 3393fcebe456SJosef Bacik no_quota = check_ref(trans, root, 3394fcebe456SJosef Bacik disko); 3395fcebe456SJosef Bacik if (no_quota < 0) { 3396fcebe456SJosef Bacik btrfs_abort_transaction(trans, 3397fcebe456SJosef Bacik root, 3398fcebe456SJosef Bacik ret); 3399fcebe456SJosef Bacik btrfs_end_transaction(trans, 3400fcebe456SJosef Bacik root); 3401fcebe456SJosef Bacik ret = no_quota; 3402fcebe456SJosef Bacik goto out; 3403fcebe456SJosef Bacik } 3404fcebe456SJosef Bacik } 3405fcebe456SJosef Bacik 3406c5c9cd4dSSage Weil if (disko) { 3407c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3408ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 34095d4f98a2SYan Zheng disko, diskl, 0, 3410f46b5a66SChristoph Hellwig root->root_key.objectid, 341133345d01SLi Zefan btrfs_ino(inode), 341266d7e7f0SArne Jansen new_key.offset - datao, 3413fcebe456SJosef Bacik no_quota); 341479787eaaSJeff Mahoney if (ret) { 341579787eaaSJeff Mahoney btrfs_abort_transaction(trans, 341679787eaaSJeff Mahoney root, 341779787eaaSJeff Mahoney ret); 341879787eaaSJeff Mahoney btrfs_end_transaction(trans, 341979787eaaSJeff Mahoney root); 342079787eaaSJeff Mahoney goto out; 342179787eaaSJeff Mahoney 342279787eaaSJeff Mahoney } 3423f46b5a66SChristoph Hellwig } 3424c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3425c5c9cd4dSSage Weil u64 skip = 0; 3426c5c9cd4dSSage Weil u64 trim = 0; 3427d3ecfcdfSLiu Bo u64 aligned_end = 0; 3428d3ecfcdfSLiu Bo 3429c5c9cd4dSSage Weil if (off > key.offset) { 3430c5c9cd4dSSage Weil skip = off - key.offset; 3431c5c9cd4dSSage Weil new_key.offset += skip; 343231840ae1SZheng Yan } 3433d397712bSChris Mason 3434c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3435c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3436d397712bSChris Mason 3437c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3438c5c9cd4dSSage Weil ret = -EINVAL; 3439a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3440c5c9cd4dSSage Weil goto out; 344131840ae1SZheng Yan } 3442c5c9cd4dSSage Weil size -= skip + trim; 3443c5c9cd4dSSage Weil datal -= skip + trim; 3444a22285a6SYan, Zheng 3445d3ecfcdfSLiu Bo aligned_end = ALIGN(new_key.offset + datal, 3446d3ecfcdfSLiu Bo root->sectorsize); 34475dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3448f82a9901SFilipe Manana drop_start, 3449d3ecfcdfSLiu Bo aligned_end, 34502671485dSJosef Bacik 1); 345179787eaaSJeff Mahoney if (ret) { 34523f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 34533a29bc09SChris Mason btrfs_abort_transaction(trans, 34543a29bc09SChris Mason root, ret); 345579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 345679787eaaSJeff Mahoney goto out; 345779787eaaSJeff Mahoney } 3458a22285a6SYan, Zheng 3459c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3460c5c9cd4dSSage Weil &new_key, size); 346179787eaaSJeff Mahoney if (ret) { 346279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 346379787eaaSJeff Mahoney ret); 346479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 346579787eaaSJeff Mahoney goto out; 346679787eaaSJeff Mahoney } 3467c5c9cd4dSSage Weil 3468c5c9cd4dSSage Weil if (skip) { 3469d397712bSChris Mason u32 start = 3470d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3471c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3472c5c9cd4dSSage Weil datal); 3473c5c9cd4dSSage Weil } 3474c5c9cd4dSSage Weil 3475c5c9cd4dSSage Weil leaf = path->nodes[0]; 3476c5c9cd4dSSage Weil slot = path->slots[0]; 3477c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3478c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3479c5c9cd4dSSage Weil size); 3480c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3481c5c9cd4dSSage Weil } 3482c5c9cd4dSSage Weil 34837ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 34847ffbb598SFilipe Manana if (drop_start < new_key.offset) 34857ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 348614f59796SFilipe Manana NULL, drop_start, 34877ffbb598SFilipe Manana new_key.offset - drop_start); 34887ffbb598SFilipe Manana 348914f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 34907ffbb598SFilipe Manana 3491c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3492b3b4aa74SDavid Sterba btrfs_release_path(path); 3493c5c9cd4dSSage Weil 349462e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 349562e2390eSFilipe Manana root->sectorsize); 3496f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3497f82a9901SFilipe Manana last_dest_end, 3498f82a9901SFilipe Manana destoff, olen); 3499f82a9901SFilipe Manana if (ret) 350079787eaaSJeff Mahoney goto out; 35012c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 35022c463823SFilipe Manana break; 3503a22285a6SYan, Zheng } 3504b3b4aa74SDavid Sterba btrfs_release_path(path); 3505df858e76SFilipe Manana key.offset = next_key_min_offset; 3506ae01a0abSYan Zheng } 3507f46b5a66SChristoph Hellwig ret = 0; 350832b7c687SMark Fasheh 3509f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3510f82a9901SFilipe Manana /* 3511f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3512f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3513f82a9901SFilipe Manana */ 3514b3b4aa74SDavid Sterba btrfs_release_path(path); 3515f82a9901SFilipe Manana 3516f82a9901SFilipe Manana /* 3517f82a9901SFilipe Manana * 1 - remove extent(s) 3518f82a9901SFilipe Manana * 1 - inode update 3519f82a9901SFilipe Manana */ 3520f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3521f82a9901SFilipe Manana if (IS_ERR(trans)) { 3522f82a9901SFilipe Manana ret = PTR_ERR(trans); 3523f82a9901SFilipe Manana goto out; 3524f82a9901SFilipe Manana } 3525f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3526f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3527f82a9901SFilipe Manana if (ret) { 3528f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3529f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3530f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3531f82a9901SFilipe Manana goto out; 3532f82a9901SFilipe Manana } 353314f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 353414f59796SFilipe Manana destoff + len - last_dest_end); 3535f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 3536f82a9901SFilipe Manana destoff, olen); 3537f82a9901SFilipe Manana } 3538f82a9901SFilipe Manana 3539f46b5a66SChristoph Hellwig out: 354032b7c687SMark Fasheh btrfs_free_path(path); 354132b7c687SMark Fasheh vfree(buf); 354232b7c687SMark Fasheh return ret; 354332b7c687SMark Fasheh } 354432b7c687SMark Fasheh 354532b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 354632b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 354732b7c687SMark Fasheh { 354854563d41SAl Viro struct inode *inode = file_inode(file); 354932b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 355032b7c687SMark Fasheh struct fd src_file; 355132b7c687SMark Fasheh struct inode *src; 355232b7c687SMark Fasheh int ret; 355332b7c687SMark Fasheh u64 len = olen; 355432b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 355532b7c687SMark Fasheh int same_inode = 0; 355632b7c687SMark Fasheh 355732b7c687SMark Fasheh /* 355832b7c687SMark Fasheh * TODO: 355932b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 356032b7c687SMark Fasheh * decompress into destination's address_space (the file offset 356132b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 356232b7c687SMark Fasheh * otherwise reinsert) a subrange. 356300fdf13aSLiu Bo * 356400fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 356500fdf13aSLiu Bo * be either compressed or non-compressed. 356632b7c687SMark Fasheh */ 356732b7c687SMark Fasheh 356832b7c687SMark Fasheh /* the destination must be opened for writing */ 356932b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 357032b7c687SMark Fasheh return -EINVAL; 357132b7c687SMark Fasheh 357232b7c687SMark Fasheh if (btrfs_root_readonly(root)) 357332b7c687SMark Fasheh return -EROFS; 357432b7c687SMark Fasheh 357532b7c687SMark Fasheh ret = mnt_want_write_file(file); 357632b7c687SMark Fasheh if (ret) 357732b7c687SMark Fasheh return ret; 357832b7c687SMark Fasheh 357932b7c687SMark Fasheh src_file = fdget(srcfd); 358032b7c687SMark Fasheh if (!src_file.file) { 358132b7c687SMark Fasheh ret = -EBADF; 358232b7c687SMark Fasheh goto out_drop_write; 358332b7c687SMark Fasheh } 358432b7c687SMark Fasheh 358532b7c687SMark Fasheh ret = -EXDEV; 358632b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 358732b7c687SMark Fasheh goto out_fput; 358832b7c687SMark Fasheh 358932b7c687SMark Fasheh src = file_inode(src_file.file); 359032b7c687SMark Fasheh 359132b7c687SMark Fasheh ret = -EINVAL; 359232b7c687SMark Fasheh if (src == inode) 359332b7c687SMark Fasheh same_inode = 1; 359432b7c687SMark Fasheh 359532b7c687SMark Fasheh /* the src must be open for reading */ 359632b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 359732b7c687SMark Fasheh goto out_fput; 359832b7c687SMark Fasheh 359932b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 360032b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 360132b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 360232b7c687SMark Fasheh goto out_fput; 360332b7c687SMark Fasheh 360432b7c687SMark Fasheh ret = -EISDIR; 360532b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 360632b7c687SMark Fasheh goto out_fput; 360732b7c687SMark Fasheh 360832b7c687SMark Fasheh ret = -EXDEV; 360932b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 361032b7c687SMark Fasheh goto out_fput; 361132b7c687SMark Fasheh 361232b7c687SMark Fasheh if (!same_inode) { 361332b7c687SMark Fasheh if (inode < src) { 361432b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 361532b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 361632b7c687SMark Fasheh } else { 361732b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 361832b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 361932b7c687SMark Fasheh } 362032b7c687SMark Fasheh } else { 362132b7c687SMark Fasheh mutex_lock(&src->i_mutex); 362232b7c687SMark Fasheh } 362332b7c687SMark Fasheh 362432b7c687SMark Fasheh /* determine range to clone */ 362532b7c687SMark Fasheh ret = -EINVAL; 362632b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 362732b7c687SMark Fasheh goto out_unlock; 362832b7c687SMark Fasheh if (len == 0) 362932b7c687SMark Fasheh olen = len = src->i_size - off; 363032b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 363132b7c687SMark Fasheh if (off + len == src->i_size) 363232b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 363332b7c687SMark Fasheh 3634ccccf3d6SFilipe Manana if (len == 0) { 3635ccccf3d6SFilipe Manana ret = 0; 3636ccccf3d6SFilipe Manana goto out_unlock; 3637ccccf3d6SFilipe Manana } 3638ccccf3d6SFilipe Manana 363932b7c687SMark Fasheh /* verify the end result is block aligned */ 364032b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 364132b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 364232b7c687SMark Fasheh goto out_unlock; 364332b7c687SMark Fasheh 364432b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 364532b7c687SMark Fasheh if (same_inode) { 364632b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 364732b7c687SMark Fasheh goto out_unlock; 364832b7c687SMark Fasheh } 364932b7c687SMark Fasheh 365032b7c687SMark Fasheh if (destoff > inode->i_size) { 365132b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 365232b7c687SMark Fasheh if (ret) 365332b7c687SMark Fasheh goto out_unlock; 365432b7c687SMark Fasheh } 365532b7c687SMark Fasheh 3656c125b8bfSFilipe Manana /* 3657c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3658c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3659c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3660c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3661c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3662c125b8bfSFilipe Manana */ 3663c125b8bfSFilipe Manana if (same_inode) { 3664c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3665c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 366632b7c687SMark Fasheh 3667c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3668c125b8bfSFilipe Manana } else { 366932b7c687SMark Fasheh lock_extent_range(src, off, len); 3670c125b8bfSFilipe Manana lock_extent_range(inode, destoff, len); 3671c125b8bfSFilipe Manana } 367232b7c687SMark Fasheh 367332b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 367432b7c687SMark Fasheh 3675c125b8bfSFilipe Manana if (same_inode) { 3676c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3677c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3678c125b8bfSFilipe Manana 3679c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3680c125b8bfSFilipe Manana } else { 3681aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3682c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(inode)->io_tree, destoff, 3683c125b8bfSFilipe Manana destoff + len - 1); 3684c125b8bfSFilipe Manana } 3685c125b8bfSFilipe Manana /* 3686c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3687c125b8bfSFilipe Manana * data immediately and not the previous data. 3688c125b8bfSFilipe Manana */ 3689c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3690c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3691f46b5a66SChristoph Hellwig out_unlock: 3692c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3693c57c2b3eSFilipe David Borba Manana if (inode < src) { 3694f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3695f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3696c57c2b3eSFilipe David Borba Manana } else { 3697c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3698c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3699c57c2b3eSFilipe David Borba Manana } 3700c57c2b3eSFilipe David Borba Manana } else { 3701c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3702c57c2b3eSFilipe David Borba Manana } 3703f46b5a66SChristoph Hellwig out_fput: 37042903ff01SAl Viro fdput(src_file); 3705ab67b7c1SYan Zheng out_drop_write: 37062a79f17eSAl Viro mnt_drop_write_file(file); 3707f46b5a66SChristoph Hellwig return ret; 3708f46b5a66SChristoph Hellwig } 3709f46b5a66SChristoph Hellwig 37107a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3711c5c9cd4dSSage Weil { 3712c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3713c5c9cd4dSSage Weil 37147a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3715c5c9cd4dSSage Weil return -EFAULT; 3716c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3717c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3718c5c9cd4dSSage Weil } 3719c5c9cd4dSSage Weil 3720f46b5a66SChristoph Hellwig /* 3721f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3722f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3723f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3724f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3725f46b5a66SChristoph Hellwig */ 3726b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3727f46b5a66SChristoph Hellwig { 3728496ad9aaSAl Viro struct inode *inode = file_inode(file); 3729f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3730f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 37311ab86aedSSage Weil int ret; 3732f46b5a66SChristoph Hellwig 37331ab86aedSSage Weil ret = -EPERM; 3734df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3735f46b5a66SChristoph Hellwig goto out; 37361ab86aedSSage Weil 37371ab86aedSSage Weil ret = -EINPROGRESS; 37381ab86aedSSage Weil if (file->private_data) 37391ab86aedSSage Weil goto out; 37409ca9ee09SSage Weil 3741b83cc969SLi Zefan ret = -EROFS; 3742b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3743b83cc969SLi Zefan goto out; 3744b83cc969SLi Zefan 3745a561be71SAl Viro ret = mnt_want_write_file(file); 3746c146afadSYan Zheng if (ret) 3747c146afadSYan Zheng goto out; 3748c146afadSYan Zheng 3749a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 37509ca9ee09SSage Weil 3751f46b5a66SChristoph Hellwig ret = -ENOMEM; 37527a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3753abd30bb0STsutomu Itoh if (IS_ERR(trans)) 37541ab86aedSSage Weil goto out_drop; 37551ab86aedSSage Weil 37561ab86aedSSage Weil file->private_data = trans; 37571ab86aedSSage Weil return 0; 37581ab86aedSSage Weil 37591ab86aedSSage Weil out_drop: 3760a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 37612a79f17eSAl Viro mnt_drop_write_file(file); 3762f46b5a66SChristoph Hellwig out: 3763f46b5a66SChristoph Hellwig return ret; 3764f46b5a66SChristoph Hellwig } 3765f46b5a66SChristoph Hellwig 37666ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37676ef5ed0dSJosef Bacik { 3768496ad9aaSAl Viro struct inode *inode = file_inode(file); 37696ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37706ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37716ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37726ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37736ef5ed0dSJosef Bacik struct btrfs_path *path; 37746ef5ed0dSJosef Bacik struct btrfs_key location; 37756ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37766ef5ed0dSJosef Bacik u64 objectid = 0; 37776ef5ed0dSJosef Bacik u64 dir_id; 37783c04ce01SMiao Xie int ret; 37796ef5ed0dSJosef Bacik 37806ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37816ef5ed0dSJosef Bacik return -EPERM; 37826ef5ed0dSJosef Bacik 37833c04ce01SMiao Xie ret = mnt_want_write_file(file); 37843c04ce01SMiao Xie if (ret) 37853c04ce01SMiao Xie return ret; 37863c04ce01SMiao Xie 37873c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37883c04ce01SMiao Xie ret = -EFAULT; 37893c04ce01SMiao Xie goto out; 37903c04ce01SMiao Xie } 37916ef5ed0dSJosef Bacik 37926ef5ed0dSJosef Bacik if (!objectid) 37931cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 37946ef5ed0dSJosef Bacik 37956ef5ed0dSJosef Bacik location.objectid = objectid; 37966ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 37976ef5ed0dSJosef Bacik location.offset = (u64)-1; 37986ef5ed0dSJosef Bacik 37996ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 38003c04ce01SMiao Xie if (IS_ERR(new_root)) { 38013c04ce01SMiao Xie ret = PTR_ERR(new_root); 38023c04ce01SMiao Xie goto out; 38033c04ce01SMiao Xie } 38046ef5ed0dSJosef Bacik 38056ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38063c04ce01SMiao Xie if (!path) { 38073c04ce01SMiao Xie ret = -ENOMEM; 38083c04ce01SMiao Xie goto out; 38093c04ce01SMiao Xie } 38106ef5ed0dSJosef Bacik path->leave_spinning = 1; 38116ef5ed0dSJosef Bacik 38126ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 381398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38146ef5ed0dSJosef Bacik btrfs_free_path(path); 38153c04ce01SMiao Xie ret = PTR_ERR(trans); 38163c04ce01SMiao Xie goto out; 38176ef5ed0dSJosef Bacik } 38186ef5ed0dSJosef Bacik 38196c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 38206ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 38216ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3822cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38236ef5ed0dSJosef Bacik btrfs_free_path(path); 38246ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3825efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3826efe120a0SFrank Holton "item, this isn't going to work"); 38273c04ce01SMiao Xie ret = -ENOENT; 38283c04ce01SMiao Xie goto out; 38296ef5ed0dSJosef Bacik } 38306ef5ed0dSJosef Bacik 38316ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38326ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38336ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38346ef5ed0dSJosef Bacik btrfs_free_path(path); 38356ef5ed0dSJosef Bacik 38362b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 38376ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 38383c04ce01SMiao Xie out: 38393c04ce01SMiao Xie mnt_drop_write_file(file); 38403c04ce01SMiao Xie return ret; 38416ef5ed0dSJosef Bacik } 38426ef5ed0dSJosef Bacik 38435af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3844bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3845bf5fc093SJosef Bacik { 3846bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3847bf5fc093SJosef Bacik 3848bf5fc093SJosef Bacik space->total_bytes = 0; 3849bf5fc093SJosef Bacik space->used_bytes = 0; 3850bf5fc093SJosef Bacik space->flags = 0; 3851bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3852bf5fc093SJosef Bacik space->flags = block_group->flags; 3853bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3854bf5fc093SJosef Bacik space->used_bytes += 3855bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3856bf5fc093SJosef Bacik } 3857bf5fc093SJosef Bacik } 3858bf5fc093SJosef Bacik 385948a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 38601406e432SJosef Bacik { 38611406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38621406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38631406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38647fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 386513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38661406e432SJosef Bacik struct btrfs_space_info *info; 3867bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3868bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3869bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3870bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3871bf5fc093SJosef Bacik int num_types = 4; 38727fde62bfSChris Mason int alloc_size; 38731406e432SJosef Bacik int ret = 0; 387451788b1bSDan Rosenberg u64 slot_count = 0; 3875bf5fc093SJosef Bacik int i, c; 38761406e432SJosef Bacik 38771406e432SJosef Bacik if (copy_from_user(&space_args, 38781406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38791406e432SJosef Bacik sizeof(space_args))) 38801406e432SJosef Bacik return -EFAULT; 38811406e432SJosef Bacik 3882bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3883bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3884bf5fc093SJosef Bacik 3885bf5fc093SJosef Bacik info = NULL; 38867fde62bfSChris Mason rcu_read_lock(); 3887bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3888bf5fc093SJosef Bacik list) { 3889bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3890bf5fc093SJosef Bacik info = tmp; 3891bf5fc093SJosef Bacik break; 3892bf5fc093SJosef Bacik } 3893bf5fc093SJosef Bacik } 38947fde62bfSChris Mason rcu_read_unlock(); 38951406e432SJosef Bacik 3896bf5fc093SJosef Bacik if (!info) 3897bf5fc093SJosef Bacik continue; 3898bf5fc093SJosef Bacik 3899bf5fc093SJosef Bacik down_read(&info->groups_sem); 3900bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3901bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3902bf5fc093SJosef Bacik slot_count++; 3903bf5fc093SJosef Bacik } 3904bf5fc093SJosef Bacik up_read(&info->groups_sem); 3905bf5fc093SJosef Bacik } 3906bf5fc093SJosef Bacik 390736523e95SDavid Sterba /* 390836523e95SDavid Sterba * Global block reserve, exported as a space_info 390936523e95SDavid Sterba */ 391036523e95SDavid Sterba slot_count++; 391136523e95SDavid Sterba 39127fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39137fde62bfSChris Mason if (space_args.space_slots == 0) { 39147fde62bfSChris Mason space_args.total_spaces = slot_count; 39157fde62bfSChris Mason goto out; 39167fde62bfSChris Mason } 3917bf5fc093SJosef Bacik 391851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3919bf5fc093SJosef Bacik 39207fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3921bf5fc093SJosef Bacik 39227fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39237fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39247fde62bfSChris Mason */ 39257fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 39267fde62bfSChris Mason return -ENOMEM; 39277fde62bfSChris Mason 39287fde62bfSChris Mason space_args.total_spaces = 0; 39297fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 39307fde62bfSChris Mason if (!dest) 39317fde62bfSChris Mason return -ENOMEM; 39327fde62bfSChris Mason dest_orig = dest; 39337fde62bfSChris Mason 39347fde62bfSChris Mason /* now we have a buffer to copy into */ 3935bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3936bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3937bf5fc093SJosef Bacik 393851788b1bSDan Rosenberg if (!slot_count) 393951788b1bSDan Rosenberg break; 394051788b1bSDan Rosenberg 3941bf5fc093SJosef Bacik info = NULL; 39421406e432SJosef Bacik rcu_read_lock(); 3943bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3944bf5fc093SJosef Bacik list) { 3945bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3946bf5fc093SJosef Bacik info = tmp; 39477fde62bfSChris Mason break; 3948bf5fc093SJosef Bacik } 3949bf5fc093SJosef Bacik } 3950bf5fc093SJosef Bacik rcu_read_unlock(); 39517fde62bfSChris Mason 3952bf5fc093SJosef Bacik if (!info) 3953bf5fc093SJosef Bacik continue; 3954bf5fc093SJosef Bacik down_read(&info->groups_sem); 3955bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3956bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 39575af3e8ccSStefan Behrens btrfs_get_block_group_info( 39585af3e8ccSStefan Behrens &info->block_groups[c], &space); 39597fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39601406e432SJosef Bacik dest++; 39611406e432SJosef Bacik space_args.total_spaces++; 396251788b1bSDan Rosenberg slot_count--; 39631406e432SJosef Bacik } 396451788b1bSDan Rosenberg if (!slot_count) 396551788b1bSDan Rosenberg break; 3966bf5fc093SJosef Bacik } 3967bf5fc093SJosef Bacik up_read(&info->groups_sem); 3968bf5fc093SJosef Bacik } 39691406e432SJosef Bacik 397036523e95SDavid Sterba /* 397136523e95SDavid Sterba * Add global block reserve 397236523e95SDavid Sterba */ 397336523e95SDavid Sterba if (slot_count) { 397436523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 397536523e95SDavid Sterba 397636523e95SDavid Sterba spin_lock(&block_rsv->lock); 397736523e95SDavid Sterba space.total_bytes = block_rsv->size; 397836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 397936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 398036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 398136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 398236523e95SDavid Sterba space_args.total_spaces++; 398336523e95SDavid Sterba } 398436523e95SDavid Sterba 39852eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39867fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39877fde62bfSChris Mason 39887fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39897fde62bfSChris Mason ret = -EFAULT; 39907fde62bfSChris Mason 39917fde62bfSChris Mason kfree(dest_orig); 39927fde62bfSChris Mason out: 39937fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39941406e432SJosef Bacik ret = -EFAULT; 39951406e432SJosef Bacik 39961406e432SJosef Bacik return ret; 39971406e432SJosef Bacik } 39981406e432SJosef Bacik 3999f46b5a66SChristoph Hellwig /* 4000f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4001f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4002f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4003f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4004f46b5a66SChristoph Hellwig */ 4005f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4006f46b5a66SChristoph Hellwig { 4007496ad9aaSAl Viro struct inode *inode = file_inode(file); 4008f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4009f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4010f46b5a66SChristoph Hellwig 4011f46b5a66SChristoph Hellwig trans = file->private_data; 40121ab86aedSSage Weil if (!trans) 40131ab86aedSSage Weil return -EINVAL; 4014b214107eSChristoph Hellwig file->private_data = NULL; 40159ca9ee09SSage Weil 40161ab86aedSSage Weil btrfs_end_transaction(trans, root); 40171ab86aedSSage Weil 4018a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 40199ca9ee09SSage Weil 40202a79f17eSAl Viro mnt_drop_write_file(file); 40211ab86aedSSage Weil return 0; 4022f46b5a66SChristoph Hellwig } 4023f46b5a66SChristoph Hellwig 40249a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40259a8c28beSMiao Xie void __user *argp) 402646204592SSage Weil { 402746204592SSage Weil struct btrfs_trans_handle *trans; 402846204592SSage Weil u64 transid; 4029db5b493aSTsutomu Itoh int ret; 403046204592SSage Weil 4031d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4032ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4033ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 403498d5dc13STsutomu Itoh return PTR_ERR(trans); 4035ff7c1d33SMiao Xie 4036ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4037ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4038ff7c1d33SMiao Xie goto out; 4039ff7c1d33SMiao Xie } 404046204592SSage Weil transid = trans->transid; 4041db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 40428b2b2d3cSTsutomu Itoh if (ret) { 40438b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4044db5b493aSTsutomu Itoh return ret; 40458b2b2d3cSTsutomu Itoh } 4046ff7c1d33SMiao Xie out: 404746204592SSage Weil if (argp) 404846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 404946204592SSage Weil return -EFAULT; 405046204592SSage Weil return 0; 405146204592SSage Weil } 405246204592SSage Weil 40539a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 40549a8c28beSMiao Xie void __user *argp) 405546204592SSage Weil { 405646204592SSage Weil u64 transid; 405746204592SSage Weil 405846204592SSage Weil if (argp) { 405946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 406046204592SSage Weil return -EFAULT; 406146204592SSage Weil } else { 406246204592SSage Weil transid = 0; /* current trans */ 406346204592SSage Weil } 406446204592SSage Weil return btrfs_wait_for_commit(root, transid); 406546204592SSage Weil } 406646204592SSage Weil 4067b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4068475f6387SJan Schmidt { 4069496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4070475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4071b8e95489SMiao Xie int ret; 4072475f6387SJan Schmidt 4073475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4074475f6387SJan Schmidt return -EPERM; 4075475f6387SJan Schmidt 4076475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4077475f6387SJan Schmidt if (IS_ERR(sa)) 4078475f6387SJan Schmidt return PTR_ERR(sa); 4079475f6387SJan Schmidt 4080b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4081b8e95489SMiao Xie ret = mnt_want_write_file(file); 4082b8e95489SMiao Xie if (ret) 4083b8e95489SMiao Xie goto out; 4084b8e95489SMiao Xie } 4085b8e95489SMiao Xie 4086aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 408763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 408863a212abSStefan Behrens 0); 4089475f6387SJan Schmidt 4090475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4091475f6387SJan Schmidt ret = -EFAULT; 4092475f6387SJan Schmidt 4093b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4094b8e95489SMiao Xie mnt_drop_write_file(file); 4095b8e95489SMiao Xie out: 4096475f6387SJan Schmidt kfree(sa); 4097475f6387SJan Schmidt return ret; 4098475f6387SJan Schmidt } 4099475f6387SJan Schmidt 4100475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4101475f6387SJan Schmidt { 4102475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4103475f6387SJan Schmidt return -EPERM; 4104475f6387SJan Schmidt 4105aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4106475f6387SJan Schmidt } 4107475f6387SJan Schmidt 4108475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4109475f6387SJan Schmidt void __user *arg) 4110475f6387SJan Schmidt { 4111475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4112475f6387SJan Schmidt int ret; 4113475f6387SJan Schmidt 4114475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4115475f6387SJan Schmidt return -EPERM; 4116475f6387SJan Schmidt 4117475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4118475f6387SJan Schmidt if (IS_ERR(sa)) 4119475f6387SJan Schmidt return PTR_ERR(sa); 4120475f6387SJan Schmidt 4121475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4122475f6387SJan Schmidt 4123475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4124475f6387SJan Schmidt ret = -EFAULT; 4125475f6387SJan Schmidt 4126475f6387SJan Schmidt kfree(sa); 4127475f6387SJan Schmidt return ret; 4128475f6387SJan Schmidt } 4129475f6387SJan Schmidt 4130c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4131b27f7c0cSDavid Sterba void __user *arg) 4132c11d2c23SStefan Behrens { 4133c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4134c11d2c23SStefan Behrens int ret; 4135c11d2c23SStefan Behrens 4136c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4137c11d2c23SStefan Behrens if (IS_ERR(sa)) 4138c11d2c23SStefan Behrens return PTR_ERR(sa); 4139c11d2c23SStefan Behrens 4140b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4141b27f7c0cSDavid Sterba kfree(sa); 4142b27f7c0cSDavid Sterba return -EPERM; 4143b27f7c0cSDavid Sterba } 4144b27f7c0cSDavid Sterba 4145b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4146c11d2c23SStefan Behrens 4147c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4148c11d2c23SStefan Behrens ret = -EFAULT; 4149c11d2c23SStefan Behrens 4150c11d2c23SStefan Behrens kfree(sa); 4151c11d2c23SStefan Behrens return ret; 4152c11d2c23SStefan Behrens } 4153c11d2c23SStefan Behrens 41543f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 41553f6bcfbdSStefan Behrens { 41563f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41573f6bcfbdSStefan Behrens int ret; 41583f6bcfbdSStefan Behrens 41593f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41603f6bcfbdSStefan Behrens return -EPERM; 41613f6bcfbdSStefan Behrens 41623f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41633f6bcfbdSStefan Behrens if (IS_ERR(p)) 41643f6bcfbdSStefan Behrens return PTR_ERR(p); 41653f6bcfbdSStefan Behrens 41663f6bcfbdSStefan Behrens switch (p->cmd) { 41673f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4168adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4169adfa97cbSIlya Dryomov ret = -EROFS; 4170adfa97cbSIlya Dryomov goto out; 4171adfa97cbSIlya Dryomov } 41723f6bcfbdSStefan Behrens if (atomic_xchg( 41733f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41743f6bcfbdSStefan Behrens 1)) { 4175e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41763f6bcfbdSStefan Behrens } else { 41773f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 41783f6bcfbdSStefan Behrens atomic_set( 41793f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41803f6bcfbdSStefan Behrens 0); 41813f6bcfbdSStefan Behrens } 41823f6bcfbdSStefan Behrens break; 41833f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41843f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 41853f6bcfbdSStefan Behrens ret = 0; 41863f6bcfbdSStefan Behrens break; 41873f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 41883f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 41893f6bcfbdSStefan Behrens break; 41903f6bcfbdSStefan Behrens default: 41913f6bcfbdSStefan Behrens ret = -EINVAL; 41923f6bcfbdSStefan Behrens break; 41933f6bcfbdSStefan Behrens } 41943f6bcfbdSStefan Behrens 41953f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 41963f6bcfbdSStefan Behrens ret = -EFAULT; 4197adfa97cbSIlya Dryomov out: 41983f6bcfbdSStefan Behrens kfree(p); 41993f6bcfbdSStefan Behrens return ret; 42003f6bcfbdSStefan Behrens } 42013f6bcfbdSStefan Behrens 4202d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4203d7728c96SJan Schmidt { 4204d7728c96SJan Schmidt int ret = 0; 4205d7728c96SJan Schmidt int i; 4206740c3d22SChris Mason u64 rel_ptr; 4207d7728c96SJan Schmidt int size; 4208806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4209d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4210d7728c96SJan Schmidt struct btrfs_path *path; 4211d7728c96SJan Schmidt 421282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4213d7728c96SJan Schmidt return -EPERM; 4214d7728c96SJan Schmidt 4215d7728c96SJan Schmidt path = btrfs_alloc_path(); 4216d7728c96SJan Schmidt if (!path) { 4217d7728c96SJan Schmidt ret = -ENOMEM; 4218d7728c96SJan Schmidt goto out; 4219d7728c96SJan Schmidt } 4220d7728c96SJan Schmidt 4221d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4222d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4223d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4224d7728c96SJan Schmidt ipa = NULL; 4225d7728c96SJan Schmidt goto out; 4226d7728c96SJan Schmidt } 4227d7728c96SJan Schmidt 4228d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4229d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4230d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4231d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4232d7728c96SJan Schmidt ipath = NULL; 4233d7728c96SJan Schmidt goto out; 4234d7728c96SJan Schmidt } 4235d7728c96SJan Schmidt 4236d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4237d7728c96SJan Schmidt if (ret < 0) 4238d7728c96SJan Schmidt goto out; 4239d7728c96SJan Schmidt 4240d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4241745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4242745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4243740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4244d7728c96SJan Schmidt } 4245d7728c96SJan Schmidt 4246745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4247745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4248d7728c96SJan Schmidt if (ret) { 4249d7728c96SJan Schmidt ret = -EFAULT; 4250d7728c96SJan Schmidt goto out; 4251d7728c96SJan Schmidt } 4252d7728c96SJan Schmidt 4253d7728c96SJan Schmidt out: 4254d7728c96SJan Schmidt btrfs_free_path(path); 4255d7728c96SJan Schmidt free_ipath(ipath); 4256d7728c96SJan Schmidt kfree(ipa); 4257d7728c96SJan Schmidt 4258d7728c96SJan Schmidt return ret; 4259d7728c96SJan Schmidt } 4260d7728c96SJan Schmidt 4261d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4262d7728c96SJan Schmidt { 4263d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4264d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4265d7728c96SJan Schmidt 4266d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4267d7728c96SJan Schmidt inodes->bytes_left -= c; 4268d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4269d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4270d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4271d7728c96SJan Schmidt inodes->elem_cnt += 3; 4272d7728c96SJan Schmidt } else { 4273d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4274d7728c96SJan Schmidt inodes->bytes_left = 0; 4275d7728c96SJan Schmidt inodes->elem_missed += 3; 4276d7728c96SJan Schmidt } 4277d7728c96SJan Schmidt 4278d7728c96SJan Schmidt return 0; 4279d7728c96SJan Schmidt } 4280d7728c96SJan Schmidt 4281d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4282d7728c96SJan Schmidt void __user *arg) 4283d7728c96SJan Schmidt { 4284d7728c96SJan Schmidt int ret = 0; 4285d7728c96SJan Schmidt int size; 4286d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4287d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4288d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4289d7728c96SJan Schmidt 4290d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4291d7728c96SJan Schmidt return -EPERM; 4292d7728c96SJan Schmidt 4293d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4294d7728c96SJan Schmidt if (IS_ERR(loi)) { 4295d7728c96SJan Schmidt ret = PTR_ERR(loi); 4296d7728c96SJan Schmidt loi = NULL; 4297d7728c96SJan Schmidt goto out; 4298d7728c96SJan Schmidt } 4299d7728c96SJan Schmidt 4300d7728c96SJan Schmidt path = btrfs_alloc_path(); 4301d7728c96SJan Schmidt if (!path) { 4302d7728c96SJan Schmidt ret = -ENOMEM; 4303d7728c96SJan Schmidt goto out; 4304d7728c96SJan Schmidt } 4305d7728c96SJan Schmidt 4306425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4307d7728c96SJan Schmidt inodes = init_data_container(size); 4308d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4309d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4310d7728c96SJan Schmidt inodes = NULL; 4311d7728c96SJan Schmidt goto out; 4312d7728c96SJan Schmidt } 4313d7728c96SJan Schmidt 4314df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4315df031f07SLiu Bo build_ino_list, inodes); 4316df031f07SLiu Bo if (ret == -EINVAL) 4317d7728c96SJan Schmidt ret = -ENOENT; 4318d7728c96SJan Schmidt if (ret < 0) 4319d7728c96SJan Schmidt goto out; 4320d7728c96SJan Schmidt 4321745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4322745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4323d7728c96SJan Schmidt if (ret) 4324d7728c96SJan Schmidt ret = -EFAULT; 4325d7728c96SJan Schmidt 4326d7728c96SJan Schmidt out: 4327d7728c96SJan Schmidt btrfs_free_path(path); 4328425d17a2SLiu Bo vfree(inodes); 4329d7728c96SJan Schmidt kfree(loi); 4330d7728c96SJan Schmidt 4331d7728c96SJan Schmidt return ret; 4332d7728c96SJan Schmidt } 4333d7728c96SJan Schmidt 433419a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4335c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4336c9e9f97bSIlya Dryomov { 4337c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4338c9e9f97bSIlya Dryomov 4339c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4340c9e9f97bSIlya Dryomov 4341837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4342837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4343837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4344837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4345a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4346a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4347837d5b6eSIlya Dryomov 4348c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4349c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4350c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 435119a39dceSIlya Dryomov 435219a39dceSIlya Dryomov if (lock) { 435319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 435419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 435519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 435619a39dceSIlya Dryomov } else { 435719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 435819a39dceSIlya Dryomov } 4359c9e9f97bSIlya Dryomov } 4360c9e9f97bSIlya Dryomov 43619ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4362c9e9f97bSIlya Dryomov { 4363496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4364c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4365c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4366c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4367ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4368c9e9f97bSIlya Dryomov int ret; 4369c9e9f97bSIlya Dryomov 4370c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4371c9e9f97bSIlya Dryomov return -EPERM; 4372c9e9f97bSIlya Dryomov 4373e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43749ba1f6e4SLiu Bo if (ret) 43759ba1f6e4SLiu Bo return ret; 43769ba1f6e4SLiu Bo 4377ed0fb78fSIlya Dryomov again: 4378ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4379c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4380c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4381ed0fb78fSIlya Dryomov need_unlock = true; 4382ed0fb78fSIlya Dryomov goto locked; 4383ed0fb78fSIlya Dryomov } 4384ed0fb78fSIlya Dryomov 4385ed0fb78fSIlya Dryomov /* 4386ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4387ed0fb78fSIlya Dryomov * (1) some other op is running 4388ed0fb78fSIlya Dryomov * (2) balance is running 4389ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4390ed0fb78fSIlya Dryomov */ 4391ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4392ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4393ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4394ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4395ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4396ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4397ed0fb78fSIlya Dryomov goto again; 4398ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4399ed0fb78fSIlya Dryomov 4400ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4401ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4402ed0fb78fSIlya Dryomov /* this is (3) */ 4403ed0fb78fSIlya Dryomov need_unlock = false; 4404ed0fb78fSIlya Dryomov goto locked; 4405ed0fb78fSIlya Dryomov } 4406ed0fb78fSIlya Dryomov 4407ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4408ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4409ed0fb78fSIlya Dryomov goto again; 4410ed0fb78fSIlya Dryomov } else { 4411ed0fb78fSIlya Dryomov /* this is (2) */ 4412ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4413ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4414ed0fb78fSIlya Dryomov goto out; 4415ed0fb78fSIlya Dryomov } 4416ed0fb78fSIlya Dryomov } else { 4417ed0fb78fSIlya Dryomov /* this is (1) */ 4418ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4419e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4420ed0fb78fSIlya Dryomov goto out; 4421ed0fb78fSIlya Dryomov } 4422ed0fb78fSIlya Dryomov 4423ed0fb78fSIlya Dryomov locked: 4424ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4425c9e9f97bSIlya Dryomov 4426c9e9f97bSIlya Dryomov if (arg) { 4427c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4428c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4429c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4430ed0fb78fSIlya Dryomov goto out_unlock; 4431c9e9f97bSIlya Dryomov } 4432de322263SIlya Dryomov 4433de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4434de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4435de322263SIlya Dryomov ret = -ENOTCONN; 4436de322263SIlya Dryomov goto out_bargs; 4437de322263SIlya Dryomov } 4438de322263SIlya Dryomov 4439de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4440de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4441de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4442de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4443de322263SIlya Dryomov 4444de322263SIlya Dryomov goto do_balance; 4445de322263SIlya Dryomov } 4446c9e9f97bSIlya Dryomov } else { 4447c9e9f97bSIlya Dryomov bargs = NULL; 4448c9e9f97bSIlya Dryomov } 4449c9e9f97bSIlya Dryomov 4450ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4451837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4452837d5b6eSIlya Dryomov goto out_bargs; 4453837d5b6eSIlya Dryomov } 4454837d5b6eSIlya Dryomov 4455c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4456c9e9f97bSIlya Dryomov if (!bctl) { 4457c9e9f97bSIlya Dryomov ret = -ENOMEM; 4458c9e9f97bSIlya Dryomov goto out_bargs; 4459c9e9f97bSIlya Dryomov } 4460c9e9f97bSIlya Dryomov 4461c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4462c9e9f97bSIlya Dryomov if (arg) { 4463c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4464c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4465c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4466c9e9f97bSIlya Dryomov 4467c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4468f43ffb60SIlya Dryomov } else { 4469f43ffb60SIlya Dryomov /* balance everything - no filters */ 4470f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4471c9e9f97bSIlya Dryomov } 4472c9e9f97bSIlya Dryomov 4473de322263SIlya Dryomov do_balance: 4474c9e9f97bSIlya Dryomov /* 4475ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4476ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4477ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4478ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4479ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4480c9e9f97bSIlya Dryomov */ 4481ed0fb78fSIlya Dryomov need_unlock = false; 4482ed0fb78fSIlya Dryomov 4483ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4484ed0fb78fSIlya Dryomov 4485c9e9f97bSIlya Dryomov if (arg) { 4486c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4487c9e9f97bSIlya Dryomov ret = -EFAULT; 4488c9e9f97bSIlya Dryomov } 4489c9e9f97bSIlya Dryomov 4490c9e9f97bSIlya Dryomov out_bargs: 4491c9e9f97bSIlya Dryomov kfree(bargs); 4492ed0fb78fSIlya Dryomov out_unlock: 4493c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4494c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4495ed0fb78fSIlya Dryomov if (need_unlock) 4496ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4497ed0fb78fSIlya Dryomov out: 4498e54bfa31SLiu Bo mnt_drop_write_file(file); 4499c9e9f97bSIlya Dryomov return ret; 4500c9e9f97bSIlya Dryomov } 4501c9e9f97bSIlya Dryomov 4502837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4503837d5b6eSIlya Dryomov { 4504837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4505837d5b6eSIlya Dryomov return -EPERM; 4506837d5b6eSIlya Dryomov 4507837d5b6eSIlya Dryomov switch (cmd) { 4508837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4509837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4510a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4511a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4512837d5b6eSIlya Dryomov } 4513837d5b6eSIlya Dryomov 4514837d5b6eSIlya Dryomov return -EINVAL; 4515837d5b6eSIlya Dryomov } 4516837d5b6eSIlya Dryomov 451719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 451819a39dceSIlya Dryomov void __user *arg) 451919a39dceSIlya Dryomov { 452019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 452119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 452219a39dceSIlya Dryomov int ret = 0; 452319a39dceSIlya Dryomov 452419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 452519a39dceSIlya Dryomov return -EPERM; 452619a39dceSIlya Dryomov 452719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 452819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 452919a39dceSIlya Dryomov ret = -ENOTCONN; 453019a39dceSIlya Dryomov goto out; 453119a39dceSIlya Dryomov } 453219a39dceSIlya Dryomov 453319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 453419a39dceSIlya Dryomov if (!bargs) { 453519a39dceSIlya Dryomov ret = -ENOMEM; 453619a39dceSIlya Dryomov goto out; 453719a39dceSIlya Dryomov } 453819a39dceSIlya Dryomov 453919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 454019a39dceSIlya Dryomov 454119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 454219a39dceSIlya Dryomov ret = -EFAULT; 454319a39dceSIlya Dryomov 454419a39dceSIlya Dryomov kfree(bargs); 454519a39dceSIlya Dryomov out: 454619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 454719a39dceSIlya Dryomov return ret; 454819a39dceSIlya Dryomov } 454919a39dceSIlya Dryomov 4550905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45515d13a37bSArne Jansen { 4552496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45535d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45545d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 45555d13a37bSArne Jansen int ret; 45565d13a37bSArne Jansen int err; 45575d13a37bSArne Jansen 45585d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45595d13a37bSArne Jansen return -EPERM; 45605d13a37bSArne Jansen 4561905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4562905b0ddaSMiao Xie if (ret) 4563905b0ddaSMiao Xie return ret; 45645d13a37bSArne Jansen 45655d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4566905b0ddaSMiao Xie if (IS_ERR(sa)) { 4567905b0ddaSMiao Xie ret = PTR_ERR(sa); 4568905b0ddaSMiao Xie goto drop_write; 4569905b0ddaSMiao Xie } 45705d13a37bSArne Jansen 45717708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 457292f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 45735d13a37bSArne Jansen if (IS_ERR(trans)) { 45745d13a37bSArne Jansen ret = PTR_ERR(trans); 45755d13a37bSArne Jansen goto out; 45765d13a37bSArne Jansen } 45775d13a37bSArne Jansen 45785d13a37bSArne Jansen switch (sa->cmd) { 45795d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 45805d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 45815d13a37bSArne Jansen break; 45825d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 45835d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 45845d13a37bSArne Jansen break; 45855d13a37bSArne Jansen default: 45865d13a37bSArne Jansen ret = -EINVAL; 45875d13a37bSArne Jansen break; 45885d13a37bSArne Jansen } 45895d13a37bSArne Jansen 459092f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 45915d13a37bSArne Jansen if (err && !ret) 45925d13a37bSArne Jansen ret = err; 45935d13a37bSArne Jansen out: 45945d13a37bSArne Jansen kfree(sa); 45957708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4596905b0ddaSMiao Xie drop_write: 4597905b0ddaSMiao Xie mnt_drop_write_file(file); 45985d13a37bSArne Jansen return ret; 45995d13a37bSArne Jansen } 46005d13a37bSArne Jansen 4601905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 46025d13a37bSArne Jansen { 4603496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 46055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46065d13a37bSArne Jansen int ret; 46075d13a37bSArne Jansen int err; 46085d13a37bSArne Jansen 46095d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46105d13a37bSArne Jansen return -EPERM; 46115d13a37bSArne Jansen 4612905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4613905b0ddaSMiao Xie if (ret) 4614905b0ddaSMiao Xie return ret; 46155d13a37bSArne Jansen 46165d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4617905b0ddaSMiao Xie if (IS_ERR(sa)) { 4618905b0ddaSMiao Xie ret = PTR_ERR(sa); 4619905b0ddaSMiao Xie goto drop_write; 4620905b0ddaSMiao Xie } 46215d13a37bSArne Jansen 46225d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46235d13a37bSArne Jansen if (IS_ERR(trans)) { 46245d13a37bSArne Jansen ret = PTR_ERR(trans); 46255d13a37bSArne Jansen goto out; 46265d13a37bSArne Jansen } 46275d13a37bSArne Jansen 46285d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46295d13a37bSArne Jansen if (sa->assign) { 46305d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 46315d13a37bSArne Jansen sa->src, sa->dst); 46325d13a37bSArne Jansen } else { 46335d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 46345d13a37bSArne Jansen sa->src, sa->dst); 46355d13a37bSArne Jansen } 46365d13a37bSArne Jansen 46375d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46385d13a37bSArne Jansen if (err && !ret) 46395d13a37bSArne Jansen ret = err; 46405d13a37bSArne Jansen 46415d13a37bSArne Jansen out: 46425d13a37bSArne Jansen kfree(sa); 4643905b0ddaSMiao Xie drop_write: 4644905b0ddaSMiao Xie mnt_drop_write_file(file); 46455d13a37bSArne Jansen return ret; 46465d13a37bSArne Jansen } 46475d13a37bSArne Jansen 4648905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46495d13a37bSArne Jansen { 4650496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46515d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46525d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46535d13a37bSArne Jansen int ret; 46545d13a37bSArne Jansen int err; 46555d13a37bSArne Jansen 46565d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46575d13a37bSArne Jansen return -EPERM; 46585d13a37bSArne Jansen 4659905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4660905b0ddaSMiao Xie if (ret) 4661905b0ddaSMiao Xie return ret; 46625d13a37bSArne Jansen 46635d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4664905b0ddaSMiao Xie if (IS_ERR(sa)) { 4665905b0ddaSMiao Xie ret = PTR_ERR(sa); 4666905b0ddaSMiao Xie goto drop_write; 4667905b0ddaSMiao Xie } 46685d13a37bSArne Jansen 4669d86e56cfSMiao Xie if (!sa->qgroupid) { 4670d86e56cfSMiao Xie ret = -EINVAL; 4671d86e56cfSMiao Xie goto out; 4672d86e56cfSMiao Xie } 4673d86e56cfSMiao Xie 46745d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46755d13a37bSArne Jansen if (IS_ERR(trans)) { 46765d13a37bSArne Jansen ret = PTR_ERR(trans); 46775d13a37bSArne Jansen goto out; 46785d13a37bSArne Jansen } 46795d13a37bSArne Jansen 46805d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46815d13a37bSArne Jansen if (sa->create) { 46825d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 46835d13a37bSArne Jansen NULL); 46845d13a37bSArne Jansen } else { 46855d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 46865d13a37bSArne Jansen } 46875d13a37bSArne Jansen 46885d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46895d13a37bSArne Jansen if (err && !ret) 46905d13a37bSArne Jansen ret = err; 46915d13a37bSArne Jansen 46925d13a37bSArne Jansen out: 46935d13a37bSArne Jansen kfree(sa); 4694905b0ddaSMiao Xie drop_write: 4695905b0ddaSMiao Xie mnt_drop_write_file(file); 46965d13a37bSArne Jansen return ret; 46975d13a37bSArne Jansen } 46985d13a37bSArne Jansen 4699905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 47005d13a37bSArne Jansen { 4701496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47025d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 47035d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47045d13a37bSArne Jansen int ret; 47055d13a37bSArne Jansen int err; 47065d13a37bSArne Jansen u64 qgroupid; 47075d13a37bSArne Jansen 47085d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47095d13a37bSArne Jansen return -EPERM; 47105d13a37bSArne Jansen 4711905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4712905b0ddaSMiao Xie if (ret) 4713905b0ddaSMiao Xie return ret; 47145d13a37bSArne Jansen 47155d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4716905b0ddaSMiao Xie if (IS_ERR(sa)) { 4717905b0ddaSMiao Xie ret = PTR_ERR(sa); 4718905b0ddaSMiao Xie goto drop_write; 4719905b0ddaSMiao Xie } 47205d13a37bSArne Jansen 47215d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47225d13a37bSArne Jansen if (IS_ERR(trans)) { 47235d13a37bSArne Jansen ret = PTR_ERR(trans); 47245d13a37bSArne Jansen goto out; 47255d13a37bSArne Jansen } 47265d13a37bSArne Jansen 47275d13a37bSArne Jansen qgroupid = sa->qgroupid; 47285d13a37bSArne Jansen if (!qgroupid) { 47295d13a37bSArne Jansen /* take the current subvol as qgroup */ 47305d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47315d13a37bSArne Jansen } 47325d13a37bSArne Jansen 47335d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 47345d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 47355d13a37bSArne Jansen 47365d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47375d13a37bSArne Jansen if (err && !ret) 47385d13a37bSArne Jansen ret = err; 47395d13a37bSArne Jansen 47405d13a37bSArne Jansen out: 47415d13a37bSArne Jansen kfree(sa); 4742905b0ddaSMiao Xie drop_write: 4743905b0ddaSMiao Xie mnt_drop_write_file(file); 47445d13a37bSArne Jansen return ret; 47455d13a37bSArne Jansen } 47465d13a37bSArne Jansen 47472f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47482f232036SJan Schmidt { 47496d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47502f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47512f232036SJan Schmidt int ret; 47522f232036SJan Schmidt 47532f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47542f232036SJan Schmidt return -EPERM; 47552f232036SJan Schmidt 47562f232036SJan Schmidt ret = mnt_want_write_file(file); 47572f232036SJan Schmidt if (ret) 47582f232036SJan Schmidt return ret; 47592f232036SJan Schmidt 47602f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47612f232036SJan Schmidt if (IS_ERR(qsa)) { 47622f232036SJan Schmidt ret = PTR_ERR(qsa); 47632f232036SJan Schmidt goto drop_write; 47642f232036SJan Schmidt } 47652f232036SJan Schmidt 47662f232036SJan Schmidt if (qsa->flags) { 47672f232036SJan Schmidt ret = -EINVAL; 47682f232036SJan Schmidt goto out; 47692f232036SJan Schmidt } 47702f232036SJan Schmidt 47712f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 47722f232036SJan Schmidt 47732f232036SJan Schmidt out: 47742f232036SJan Schmidt kfree(qsa); 47752f232036SJan Schmidt drop_write: 47762f232036SJan Schmidt mnt_drop_write_file(file); 47772f232036SJan Schmidt return ret; 47782f232036SJan Schmidt } 47792f232036SJan Schmidt 47802f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 47812f232036SJan Schmidt { 47826d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47832f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47842f232036SJan Schmidt int ret = 0; 47852f232036SJan Schmidt 47862f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47872f232036SJan Schmidt return -EPERM; 47882f232036SJan Schmidt 47892f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 47902f232036SJan Schmidt if (!qsa) 47912f232036SJan Schmidt return -ENOMEM; 47922f232036SJan Schmidt 47932f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47942f232036SJan Schmidt qsa->flags = 1; 47952f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 47962f232036SJan Schmidt } 47972f232036SJan Schmidt 47982f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 47992f232036SJan Schmidt ret = -EFAULT; 48002f232036SJan Schmidt 48012f232036SJan Schmidt kfree(qsa); 48022f232036SJan Schmidt return ret; 48032f232036SJan Schmidt } 48042f232036SJan Schmidt 480557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 480657254b6eSJan Schmidt { 480754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 480857254b6eSJan Schmidt 480957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 481057254b6eSJan Schmidt return -EPERM; 481157254b6eSJan Schmidt 481257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 481357254b6eSJan Schmidt } 481457254b6eSJan Schmidt 4815abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4816abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48178ea05e3aSAlexander Block { 4818496ad9aaSAl Viro struct inode *inode = file_inode(file); 48198ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48208ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48218ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 48228ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 48238ea05e3aSAlexander Block int ret = 0; 4824dd5f9615SStefan Behrens int received_uuid_changed; 48258ea05e3aSAlexander Block 4826bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4827bd60ea0fSDavid Sterba return -EPERM; 4828bd60ea0fSDavid Sterba 48298ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48308ea05e3aSAlexander Block if (ret < 0) 48318ea05e3aSAlexander Block return ret; 48328ea05e3aSAlexander Block 48338ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 48348ea05e3aSAlexander Block 48358ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 48368ea05e3aSAlexander Block ret = -EINVAL; 48378ea05e3aSAlexander Block goto out; 48388ea05e3aSAlexander Block } 48398ea05e3aSAlexander Block 48408ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48418ea05e3aSAlexander Block ret = -EROFS; 48428ea05e3aSAlexander Block goto out; 48438ea05e3aSAlexander Block } 48448ea05e3aSAlexander Block 4845dd5f9615SStefan Behrens /* 4846dd5f9615SStefan Behrens * 1 - root item 4847dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4848dd5f9615SStefan Behrens */ 4849dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48508ea05e3aSAlexander Block if (IS_ERR(trans)) { 48518ea05e3aSAlexander Block ret = PTR_ERR(trans); 48528ea05e3aSAlexander Block trans = NULL; 48538ea05e3aSAlexander Block goto out; 48548ea05e3aSAlexander Block } 48558ea05e3aSAlexander Block 48568ea05e3aSAlexander Block sa->rtransid = trans->transid; 48578ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48588ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48598ea05e3aSAlexander Block 4860dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4861dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4862dd5f9615SStefan Behrens if (received_uuid_changed && 4863dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4864dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4865dd5f9615SStefan Behrens root_item->received_uuid, 4866dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4867dd5f9615SStefan Behrens root->root_key.objectid); 48688ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48698ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48708ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48713cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48723cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48733cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48743cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48758ea05e3aSAlexander Block 48768ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 48778ea05e3aSAlexander Block &root->root_key, &root->root_item); 48788ea05e3aSAlexander Block if (ret < 0) { 48798ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 48808ea05e3aSAlexander Block goto out; 4881dd5f9615SStefan Behrens } 4882dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4883dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4884dd5f9615SStefan Behrens sa->uuid, 4885dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4886dd5f9615SStefan Behrens root->root_key.objectid); 4887dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4888dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4889dd5f9615SStefan Behrens goto out; 4890dd5f9615SStefan Behrens } 4891dd5f9615SStefan Behrens } 48928ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4893dd5f9615SStefan Behrens if (ret < 0) { 4894dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 48958ea05e3aSAlexander Block goto out; 48968ea05e3aSAlexander Block } 48978ea05e3aSAlexander Block 4898abccd00fSHugo Mills out: 4899abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4900abccd00fSHugo Mills mnt_drop_write_file(file); 4901abccd00fSHugo Mills return ret; 4902abccd00fSHugo Mills } 4903abccd00fSHugo Mills 4904abccd00fSHugo Mills #ifdef CONFIG_64BIT 4905abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4906abccd00fSHugo Mills void __user *arg) 4907abccd00fSHugo Mills { 4908abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4909abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4910abccd00fSHugo Mills int ret = 0; 4911abccd00fSHugo Mills 4912abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4913abccd00fSHugo Mills if (IS_ERR(args32)) { 4914abccd00fSHugo Mills ret = PTR_ERR(args32); 4915abccd00fSHugo Mills args32 = NULL; 4916abccd00fSHugo Mills goto out; 4917abccd00fSHugo Mills } 4918abccd00fSHugo Mills 4919abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 492084dbeb87SDan Carpenter if (!args64) { 492184dbeb87SDan Carpenter ret = -ENOMEM; 4922abccd00fSHugo Mills goto out; 4923abccd00fSHugo Mills } 4924abccd00fSHugo Mills 4925abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4926abccd00fSHugo Mills args64->stransid = args32->stransid; 4927abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4928abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4929abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4930abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4931abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4932abccd00fSHugo Mills args64->flags = args32->flags; 4933abccd00fSHugo Mills 4934abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4935abccd00fSHugo Mills if (ret) 4936abccd00fSHugo Mills goto out; 4937abccd00fSHugo Mills 4938abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4939abccd00fSHugo Mills args32->stransid = args64->stransid; 4940abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4941abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4942abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4943abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4944abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4945abccd00fSHugo Mills args32->flags = args64->flags; 4946abccd00fSHugo Mills 4947abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4948abccd00fSHugo Mills if (ret) 4949abccd00fSHugo Mills ret = -EFAULT; 4950abccd00fSHugo Mills 4951abccd00fSHugo Mills out: 4952abccd00fSHugo Mills kfree(args32); 4953abccd00fSHugo Mills kfree(args64); 4954abccd00fSHugo Mills return ret; 4955abccd00fSHugo Mills } 4956abccd00fSHugo Mills #endif 4957abccd00fSHugo Mills 4958abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4959abccd00fSHugo Mills void __user *arg) 4960abccd00fSHugo Mills { 4961abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4962abccd00fSHugo Mills int ret = 0; 4963abccd00fSHugo Mills 4964abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4965abccd00fSHugo Mills if (IS_ERR(sa)) { 4966abccd00fSHugo Mills ret = PTR_ERR(sa); 4967abccd00fSHugo Mills sa = NULL; 4968abccd00fSHugo Mills goto out; 4969abccd00fSHugo Mills } 4970abccd00fSHugo Mills 4971abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4972abccd00fSHugo Mills 4973abccd00fSHugo Mills if (ret) 4974abccd00fSHugo Mills goto out; 4975abccd00fSHugo Mills 49768ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49778ea05e3aSAlexander Block if (ret) 49788ea05e3aSAlexander Block ret = -EFAULT; 49798ea05e3aSAlexander Block 49808ea05e3aSAlexander Block out: 49818ea05e3aSAlexander Block kfree(sa); 49828ea05e3aSAlexander Block return ret; 49838ea05e3aSAlexander Block } 49848ea05e3aSAlexander Block 4985867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4986867ab667Sjeff.liu { 49876d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4988a1b83ac5SAnand Jain size_t len; 4989867ab667Sjeff.liu int ret; 4990a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4991a1b83ac5SAnand Jain 4992a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4993a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4994a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4995a1b83ac5SAnand Jain 4996a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4997867ab667Sjeff.liu 4998867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4999efe120a0SFrank Holton btrfs_warn(root->fs_info, 5000efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5001867ab667Sjeff.liu } 5002867ab667Sjeff.liu 5003867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5004867ab667Sjeff.liu 5005867ab667Sjeff.liu return ret ? -EFAULT : 0; 5006867ab667Sjeff.liu } 5007867ab667Sjeff.liu 5008a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5009a8bfd4abSjeff.liu { 50106d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5011a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5012a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5013a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5014a8bfd4abSjeff.liu int ret; 5015a8bfd4abSjeff.liu 5016a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5017a8bfd4abSjeff.liu return -EPERM; 5018a8bfd4abSjeff.liu 5019a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5020a8bfd4abSjeff.liu return -EFAULT; 5021a8bfd4abSjeff.liu 5022a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5023efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5024a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5025a8bfd4abSjeff.liu return -EINVAL; 5026a8bfd4abSjeff.liu } 5027a8bfd4abSjeff.liu 5028a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5029a8bfd4abSjeff.liu if (ret) 5030a8bfd4abSjeff.liu return ret; 5031a8bfd4abSjeff.liu 5032a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5033a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5034a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5035a8bfd4abSjeff.liu goto out_unlock; 5036a8bfd4abSjeff.liu } 5037a8bfd4abSjeff.liu 5038a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5039a8bfd4abSjeff.liu strcpy(super_block->label, label); 5040a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5041d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5042a8bfd4abSjeff.liu 5043a8bfd4abSjeff.liu out_unlock: 5044a8bfd4abSjeff.liu mnt_drop_write_file(file); 5045a8bfd4abSjeff.liu return ret; 5046a8bfd4abSjeff.liu } 5047a8bfd4abSjeff.liu 50482eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50492eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50502eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50512eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50522eaa055fSJeff Mahoney 50532eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 50542eaa055fSJeff Mahoney void __user *arg) 50552eaa055fSJeff Mahoney { 50562eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 50572eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50582eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50592eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50602eaa055fSJeff Mahoney }; 50612eaa055fSJeff Mahoney 50622eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50632eaa055fSJeff Mahoney return -EFAULT; 50642eaa055fSJeff Mahoney 50652eaa055fSJeff Mahoney return 0; 50662eaa055fSJeff Mahoney } 50672eaa055fSJeff Mahoney 50682eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 50692eaa055fSJeff Mahoney { 50702eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 50712eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 50722eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50732eaa055fSJeff Mahoney 50742eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50752eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50762eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50772eaa055fSJeff Mahoney 50782eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50792eaa055fSJeff Mahoney return -EFAULT; 50802eaa055fSJeff Mahoney 50812eaa055fSJeff Mahoney return 0; 50822eaa055fSJeff Mahoney } 50832eaa055fSJeff Mahoney 50843b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 50853b02a68aSJeff Mahoney enum btrfs_feature_set set, 50862eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50872eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50882eaa055fSJeff Mahoney { 50893b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 50903b02a68aSJeff Mahoney char *names; 50912eaa055fSJeff Mahoney u64 disallowed, unsupported; 50922eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50932eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50942eaa055fSJeff Mahoney 50952eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50962eaa055fSJeff Mahoney if (unsupported) { 50973b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50983b02a68aSJeff Mahoney if (names) { 50993b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51003b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 51013b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51023b02a68aSJeff Mahoney kfree(names); 51033b02a68aSJeff Mahoney } else 51042eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51052eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 51062eaa055fSJeff Mahoney type, unsupported); 51072eaa055fSJeff Mahoney return -EOPNOTSUPP; 51082eaa055fSJeff Mahoney } 51092eaa055fSJeff Mahoney 51102eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51112eaa055fSJeff Mahoney if (disallowed) { 51123b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51133b02a68aSJeff Mahoney if (names) { 51143b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51153b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51163b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51173b02a68aSJeff Mahoney kfree(names); 51183b02a68aSJeff Mahoney } else 51192eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51202eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51212eaa055fSJeff Mahoney type, disallowed); 51222eaa055fSJeff Mahoney return -EPERM; 51232eaa055fSJeff Mahoney } 51242eaa055fSJeff Mahoney 51252eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51262eaa055fSJeff Mahoney if (disallowed) { 51273b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51283b02a68aSJeff Mahoney if (names) { 51293b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51303b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51313b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51323b02a68aSJeff Mahoney kfree(names); 51333b02a68aSJeff Mahoney } else 51342eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51352eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51362eaa055fSJeff Mahoney type, disallowed); 51372eaa055fSJeff Mahoney return -EPERM; 51382eaa055fSJeff Mahoney } 51392eaa055fSJeff Mahoney 51402eaa055fSJeff Mahoney return 0; 51412eaa055fSJeff Mahoney } 51422eaa055fSJeff Mahoney 51432eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 51443b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 51452eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51462eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51472eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51482eaa055fSJeff Mahoney 51492eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51502eaa055fSJeff Mahoney { 51512eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 51522eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 51532eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51542eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51552eaa055fSJeff Mahoney u64 newflags; 51562eaa055fSJeff Mahoney int ret; 51572eaa055fSJeff Mahoney 51582eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51592eaa055fSJeff Mahoney return -EPERM; 51602eaa055fSJeff Mahoney 51612eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51622eaa055fSJeff Mahoney return -EFAULT; 51632eaa055fSJeff Mahoney 51642eaa055fSJeff Mahoney /* Nothing to do */ 51652eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51662eaa055fSJeff Mahoney !flags[0].incompat_flags) 51672eaa055fSJeff Mahoney return 0; 51682eaa055fSJeff Mahoney 51692eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 51702eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51712eaa055fSJeff Mahoney if (ret) 51722eaa055fSJeff Mahoney return ret; 51732eaa055fSJeff Mahoney 51742eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 51752eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51762eaa055fSJeff Mahoney if (ret) 51772eaa055fSJeff Mahoney return ret; 51782eaa055fSJeff Mahoney 51792eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 51802eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51812eaa055fSJeff Mahoney if (ret) 51822eaa055fSJeff Mahoney return ret; 51832eaa055fSJeff Mahoney 51848051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51852eaa055fSJeff Mahoney if (IS_ERR(trans)) 51862eaa055fSJeff Mahoney return PTR_ERR(trans); 51872eaa055fSJeff Mahoney 51882eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 51892eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51902eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51912eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51922eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51932eaa055fSJeff Mahoney 51942eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51952eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51962eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51972eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51982eaa055fSJeff Mahoney 51992eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 52002eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 52012eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 52022eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 52032eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 52042eaa055fSJeff Mahoney 5205d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 52062eaa055fSJeff Mahoney } 52072eaa055fSJeff Mahoney 5208f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5209f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5210f46b5a66SChristoph Hellwig { 5211496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52124bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5213f46b5a66SChristoph Hellwig 5214f46b5a66SChristoph Hellwig switch (cmd) { 52156cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 52166cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 52176cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 52186cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 52196cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 52206cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5221f7039b1dSLi Dongyang case FITRIM: 5222f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5223f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5224fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5225fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5226fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 52273de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5228fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 52296f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 52306f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 523176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 523276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 52330caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 52340caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 52350caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 52360caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 52376ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 52386ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5239f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 52401e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 52411e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 52421e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5243f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5244198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5245f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 52464bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5247f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5248da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5249475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5250475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5251475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5252475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5253f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 52549ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5255f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 5256c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 5257c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 52587a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 5259f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5260f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5261f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5262f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5263ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5264ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5265cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5266cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5267ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5268ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5269d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5270d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5271d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5272d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 52731406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 52741406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 52759b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 52769b199859SFilipe David Borba Manana int ret; 52779b199859SFilipe David Borba Manana 52786c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 52799b199859SFilipe David Borba Manana if (ret) 52809b199859SFilipe David Borba Manana return ret; 5281ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 52822fad4e83SDavid Sterba /* 52832fad4e83SDavid Sterba * The transaction thread may want to do more work, 52842fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 52852fad4e83SDavid Sterba * processing uncleaned subvols. 52862fad4e83SDavid Sterba */ 52872fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 52889b199859SFilipe David Borba Manana return ret; 52899b199859SFilipe David Borba Manana } 529046204592SSage Weil case BTRFS_IOC_START_SYNC: 52919a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 529246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 52939a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5294475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5295b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5296475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5297475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5298475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5299475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5300c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 53019ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5302837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5303837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 530419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 530519a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 53068ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 53078ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5308abccd00fSHugo Mills #ifdef CONFIG_64BIT 5309abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5310abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5311abccd00fSHugo Mills #endif 531231db9f7cSAlexander Block case BTRFS_IOC_SEND: 531331db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5314c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5315b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 53165d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5317905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 53185d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5319905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 53205d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5321905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 53225d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5323905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 53242f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 53252f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 53262f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 53272f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 532857254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 532957254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 53303f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 53313f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5332867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5333867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5334a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5335a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5336416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5337416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 53382eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 53392eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 53402eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 53412eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 53422eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 53432eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5344f46b5a66SChristoph Hellwig } 5345f46b5a66SChristoph Hellwig 5346f46b5a66SChristoph Hellwig return -ENOTTY; 5347f46b5a66SChristoph Hellwig } 5348