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 7202b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), 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 7642b0143b5SDavid Howells if (d_really_is_negative(victim)) 7654260f7c7SSage Weil return -ENOENT; 7664260f7c7SSage Weil 7672b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != 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; 7752b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 7762b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 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 { 7952b0143b5SDavid Howells if (d_really_is_positive(child)) 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 { 8132b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 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; 8272b0143b5SDavid Howells if (d_really_is_positive(dentry)) 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 1567f46b5a66SChristoph Hellwig do_div(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; 22972b0143b5SDavid Howells struct inode *dir = d_inode(parent); 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 23362b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 233776dda93cSYan, Zheng err = -ENOENT; 233876dda93cSYan, Zheng goto out_dput; 233976dda93cSYan, Zheng } 234076dda93cSYan, Zheng 23412b0143b5SDavid Howells inode = d_inode(dentry); 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 2900416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2901416161dbSMark Fasheh 2902416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2903416161dbSMark Fasheh if (ret) 2904416161dbSMark Fasheh goto out_unlock; 2905416161dbSMark Fasheh 2906416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2907416161dbSMark Fasheh if (ret) 2908416161dbSMark Fasheh goto out_unlock; 2909416161dbSMark Fasheh 2910416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2911416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2912416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2913416161dbSMark Fasheh ret = -EINVAL; 2914416161dbSMark Fasheh goto out_unlock; 2915416161dbSMark Fasheh } 2916416161dbSMark Fasheh 2917416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2918416161dbSMark Fasheh if (ret == 0) 2919416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2920416161dbSMark Fasheh 2921416161dbSMark Fasheh out_unlock: 2922416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2923416161dbSMark Fasheh 2924416161dbSMark Fasheh return ret; 2925416161dbSMark Fasheh } 2926416161dbSMark Fasheh 2927416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2928416161dbSMark Fasheh 2929416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 29301c1c8747SAl Viro struct btrfs_ioctl_same_args __user *argp) 2931416161dbSMark Fasheh { 2932cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2933cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 29341c1c8747SAl Viro struct inode *src = file_inode(file); 2935416161dbSMark Fasheh u64 off; 2936416161dbSMark Fasheh u64 len; 2937416161dbSMark Fasheh int i; 2938416161dbSMark Fasheh int ret; 2939cbf8b8caSMark Fasheh unsigned long size; 2940416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2941416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 29421c1c8747SAl Viro u16 count; 2943416161dbSMark Fasheh 2944416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2945416161dbSMark Fasheh return -EINVAL; 2946416161dbSMark Fasheh 2947416161dbSMark Fasheh ret = mnt_want_write_file(file); 2948416161dbSMark Fasheh if (ret) 2949416161dbSMark Fasheh return ret; 2950416161dbSMark Fasheh 29511c1c8747SAl Viro if (get_user(count, &argp->dest_count)) { 2952416161dbSMark Fasheh ret = -EFAULT; 2953416161dbSMark Fasheh goto out; 2954416161dbSMark Fasheh } 2955416161dbSMark Fasheh 29561c1c8747SAl Viro size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); 2957cbf8b8caSMark Fasheh 29581c1c8747SAl Viro same = memdup_user(argp, size); 2959cbf8b8caSMark Fasheh 2960229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2961229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2962cbf8b8caSMark Fasheh goto out; 2963cbf8b8caSMark Fasheh } 2964cbf8b8caSMark Fasheh 2965cbf8b8caSMark Fasheh off = same->logical_offset; 2966cbf8b8caSMark Fasheh len = same->length; 2967416161dbSMark Fasheh 2968416161dbSMark Fasheh /* 2969416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2970416161dbSMark Fasheh * This is intended to bound the total time spent in this 2971416161dbSMark Fasheh * ioctl to something sane. 2972416161dbSMark Fasheh */ 2973416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2974416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2975416161dbSMark Fasheh 2976416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2977416161dbSMark Fasheh /* 2978416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2979416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2980416161dbSMark Fasheh * this situation without an update. 2981416161dbSMark Fasheh */ 2982416161dbSMark Fasheh ret = -EINVAL; 2983416161dbSMark Fasheh goto out; 2984416161dbSMark Fasheh } 2985416161dbSMark Fasheh 2986416161dbSMark Fasheh ret = -EISDIR; 2987416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2988416161dbSMark Fasheh goto out; 2989416161dbSMark Fasheh 2990416161dbSMark Fasheh ret = -EACCES; 2991416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2992416161dbSMark Fasheh goto out; 2993416161dbSMark Fasheh 2994cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 29951c1c8747SAl Viro for (i = 0; i < count; i++) { 2996cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2997cbf8b8caSMark Fasheh same->info[i].status = 0; 2998416161dbSMark Fasheh } 2999416161dbSMark Fasheh 30001c1c8747SAl Viro for (i = 0, info = same->info; i < count; i++, info++) { 30011c1c8747SAl Viro struct inode *dst; 30021c1c8747SAl Viro struct fd dst_file = fdget(info->fd); 30031c1c8747SAl Viro if (!dst_file.file) { 3004cbf8b8caSMark Fasheh info->status = -EBADF; 30051c1c8747SAl Viro continue; 3006416161dbSMark Fasheh } 30071c1c8747SAl Viro dst = file_inode(dst_file.file); 3008416161dbSMark Fasheh 30091c1c8747SAl Viro if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { 3010cbf8b8caSMark Fasheh info->status = -EINVAL; 30111c1c8747SAl Viro } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { 3012cbf8b8caSMark Fasheh info->status = -EXDEV; 30131c1c8747SAl Viro } else if (S_ISDIR(dst->i_mode)) { 3014cbf8b8caSMark Fasheh info->status = -EISDIR; 30151c1c8747SAl Viro } else if (!S_ISREG(dst->i_mode)) { 3016cbf8b8caSMark Fasheh info->status = -EACCES; 30171c1c8747SAl Viro } else { 3018cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 3019cbf8b8caSMark Fasheh info->logical_offset); 3020cbf8b8caSMark Fasheh if (info->status == 0) 3021cbf8b8caSMark Fasheh info->bytes_deduped += len; 30221c1c8747SAl Viro } 30231c1c8747SAl Viro fdput(dst_file); 3024cbf8b8caSMark Fasheh } 3025416161dbSMark Fasheh 3026cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 3027cbf8b8caSMark Fasheh if (ret) 3028416161dbSMark Fasheh ret = -EFAULT; 3029416161dbSMark Fasheh 3030416161dbSMark Fasheh out: 3031416161dbSMark Fasheh mnt_drop_write_file(file); 3032416161dbSMark Fasheh return ret; 3033416161dbSMark Fasheh } 3034416161dbSMark Fasheh 3035fcebe456SJosef Bacik /* Helper to check and see if this root currently has a ref on the given disk 3036fcebe456SJosef Bacik * bytenr. If it does then we need to update the quota for this root. This 3037fcebe456SJosef Bacik * doesn't do anything if quotas aren't enabled. 3038fcebe456SJosef Bacik */ 3039fcebe456SJosef Bacik static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3040fcebe456SJosef Bacik u64 disko) 3041fcebe456SJosef Bacik { 3042fcebe456SJosef Bacik struct seq_list tree_mod_seq_elem = {}; 3043fcebe456SJosef Bacik struct ulist *roots; 3044fcebe456SJosef Bacik struct ulist_iterator uiter; 3045fcebe456SJosef Bacik struct ulist_node *root_node = NULL; 3046fcebe456SJosef Bacik int ret; 3047fcebe456SJosef Bacik 3048fcebe456SJosef Bacik if (!root->fs_info->quota_enabled) 3049fcebe456SJosef Bacik return 1; 3050fcebe456SJosef Bacik 3051fcebe456SJosef Bacik btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3052fcebe456SJosef Bacik ret = btrfs_find_all_roots(trans, root->fs_info, disko, 3053fcebe456SJosef Bacik tree_mod_seq_elem.seq, &roots); 3054fcebe456SJosef Bacik if (ret < 0) 3055fcebe456SJosef Bacik goto out; 3056fcebe456SJosef Bacik ret = 0; 3057fcebe456SJosef Bacik ULIST_ITER_INIT(&uiter); 3058fcebe456SJosef Bacik while ((root_node = ulist_next(roots, &uiter))) { 3059fcebe456SJosef Bacik if (root_node->val == root->objectid) { 3060fcebe456SJosef Bacik ret = 1; 3061fcebe456SJosef Bacik break; 3062fcebe456SJosef Bacik } 3063fcebe456SJosef Bacik } 3064fcebe456SJosef Bacik ulist_free(roots); 3065fcebe456SJosef Bacik out: 3066fcebe456SJosef Bacik btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); 3067fcebe456SJosef Bacik return ret; 3068fcebe456SJosef Bacik } 3069fcebe456SJosef Bacik 3070f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3071f82a9901SFilipe Manana struct inode *inode, 3072f82a9901SFilipe Manana u64 endoff, 3073f82a9901SFilipe Manana const u64 destoff, 3074f82a9901SFilipe Manana const u64 olen) 3075f82a9901SFilipe Manana { 3076f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3077f82a9901SFilipe Manana int ret; 3078f82a9901SFilipe Manana 3079f82a9901SFilipe Manana inode_inc_iversion(inode); 3080f82a9901SFilipe Manana inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3081f82a9901SFilipe Manana /* 3082f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3083f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3084f82a9901SFilipe Manana */ 3085f82a9901SFilipe Manana if (endoff > destoff + olen) 3086f82a9901SFilipe Manana endoff = destoff + olen; 3087f82a9901SFilipe Manana if (endoff > inode->i_size) 3088f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3089f82a9901SFilipe Manana 3090f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3091f82a9901SFilipe Manana if (ret) { 3092f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3093f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3094f82a9901SFilipe Manana goto out; 3095f82a9901SFilipe Manana } 3096f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3097f82a9901SFilipe Manana out: 3098f82a9901SFilipe Manana return ret; 3099f82a9901SFilipe Manana } 3100f82a9901SFilipe Manana 31017ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 31027ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 31037ffbb598SFilipe Manana const struct btrfs_path *path, 31047ffbb598SFilipe Manana const u64 hole_offset, 31057ffbb598SFilipe Manana const u64 hole_len) 31067ffbb598SFilipe Manana { 31077ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 31087ffbb598SFilipe Manana struct extent_map *em; 31097ffbb598SFilipe Manana int ret; 31107ffbb598SFilipe Manana 31117ffbb598SFilipe Manana em = alloc_extent_map(); 31127ffbb598SFilipe Manana if (!em) { 31137ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31147ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31157ffbb598SFilipe Manana return; 31167ffbb598SFilipe Manana } 31177ffbb598SFilipe Manana 311814f59796SFilipe Manana if (path) { 311914f59796SFilipe Manana struct btrfs_file_extent_item *fi; 312014f59796SFilipe Manana 312114f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 312214f59796SFilipe Manana struct btrfs_file_extent_item); 31237ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 31247ffbb598SFilipe Manana em->generation = -1; 31257ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 31267ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 31277ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31287ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31297ffbb598SFilipe Manana } else { 31307ffbb598SFilipe Manana em->start = hole_offset; 31317ffbb598SFilipe Manana em->len = hole_len; 31327ffbb598SFilipe Manana em->ram_bytes = em->len; 31337ffbb598SFilipe Manana em->orig_start = hole_offset; 31347ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 31357ffbb598SFilipe Manana em->block_len = 0; 31367ffbb598SFilipe Manana em->orig_block_len = 0; 31377ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 31387ffbb598SFilipe Manana em->generation = trans->transid; 31397ffbb598SFilipe Manana } 31407ffbb598SFilipe Manana 31417ffbb598SFilipe Manana while (1) { 31427ffbb598SFilipe Manana write_lock(&em_tree->lock); 31437ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 31447ffbb598SFilipe Manana write_unlock(&em_tree->lock); 31457ffbb598SFilipe Manana if (ret != -EEXIST) { 31467ffbb598SFilipe Manana free_extent_map(em); 31477ffbb598SFilipe Manana break; 31487ffbb598SFilipe Manana } 31497ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 31507ffbb598SFilipe Manana em->start + em->len - 1, 0); 31517ffbb598SFilipe Manana } 31527ffbb598SFilipe Manana 3153ee39b432SDavid Sterba if (ret) 31547ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 31557ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 31567ffbb598SFilipe Manana } 31577ffbb598SFilipe Manana 315832b7c687SMark Fasheh /** 315932b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 316032b7c687SMark Fasheh * 316132b7c687SMark Fasheh * @src: Inode to clone from 316232b7c687SMark Fasheh * @inode: Inode to clone to 316332b7c687SMark Fasheh * @off: Offset within source to start clone from 316432b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 316532b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 316632b7c687SMark Fasheh * identical values here 316732b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 316832b7c687SMark Fasheh */ 316932b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3170f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 3171f82a9901SFilipe Manana const u64 destoff) 3172f46b5a66SChristoph Hellwig { 3173f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 317432b7c687SMark Fasheh struct btrfs_path *path = NULL; 3175f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 317632b7c687SMark Fasheh struct btrfs_trans_handle *trans; 317732b7c687SMark Fasheh char *buf = NULL; 3178ae01a0abSYan Zheng struct btrfs_key key; 3179f46b5a66SChristoph Hellwig u32 nritems; 3180f46b5a66SChristoph Hellwig int slot; 3181ae01a0abSYan Zheng int ret; 3182fcebe456SJosef Bacik int no_quota; 3183f82a9901SFilipe Manana const u64 len = olen_aligned; 3184fcebe456SJosef Bacik u64 last_disko = 0; 3185f82a9901SFilipe Manana u64 last_dest_end = destoff; 3186ae01a0abSYan Zheng 3187ae01a0abSYan Zheng ret = -ENOMEM; 3188707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3189ae01a0abSYan Zheng if (!buf) 319032b7c687SMark Fasheh return ret; 3191ae01a0abSYan Zheng 3192ae01a0abSYan Zheng path = btrfs_alloc_path(); 3193ae01a0abSYan Zheng if (!path) { 3194ae01a0abSYan Zheng vfree(buf); 319532b7c687SMark Fasheh return ret; 3196ae01a0abSYan Zheng } 319732b7c687SMark Fasheh 3198ae01a0abSYan Zheng path->reada = 2; 3199c5c9cd4dSSage Weil /* clone data */ 320033345d01SLi Zefan key.objectid = btrfs_ino(src); 3201ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 32022c463823SFilipe Manana key.offset = off; 3203f46b5a66SChristoph Hellwig 3204f46b5a66SChristoph Hellwig while (1) { 3205f46b5a66SChristoph Hellwig /* 3206f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3207f46b5a66SChristoph Hellwig * tree. 3208f46b5a66SChristoph Hellwig */ 3209e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3210362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3211362a20c5SDavid Sterba 0, 0); 3212f46b5a66SChristoph Hellwig if (ret < 0) 3213f46b5a66SChristoph Hellwig goto out; 32142c463823SFilipe Manana /* 32152c463823SFilipe Manana * First search, if no extent item that starts at offset off was 32162c463823SFilipe Manana * found but the previous item is an extent item, it's possible 32172c463823SFilipe Manana * it might overlap our target range, therefore process it. 32182c463823SFilipe Manana */ 32192c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 32202c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 32212c463823SFilipe Manana path->slots[0] - 1); 32222c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 32232c463823SFilipe Manana path->slots[0]--; 32242c463823SFilipe Manana } 3225f46b5a66SChristoph Hellwig 3226ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3227e4355f34SFilipe David Borba Manana process_slot: 3228fcebe456SJosef Bacik no_quota = 1; 3229ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3230362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3231f46b5a66SChristoph Hellwig if (ret < 0) 3232f46b5a66SChristoph Hellwig goto out; 3233f46b5a66SChristoph Hellwig if (ret > 0) 3234f46b5a66SChristoph Hellwig break; 3235ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3236f46b5a66SChristoph Hellwig } 3237f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3238f46b5a66SChristoph Hellwig slot = path->slots[0]; 3239f46b5a66SChristoph Hellwig 3240ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3241962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 324233345d01SLi Zefan key.objectid != btrfs_ino(src)) 3243f46b5a66SChristoph Hellwig break; 3244f46b5a66SChristoph Hellwig 3245962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3246c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3247c5c9cd4dSSage Weil int type; 324831840ae1SZheng Yan u32 size; 324931840ae1SZheng Yan struct btrfs_key new_key; 3250c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3251c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3252c5c9cd4dSSage Weil u8 comp; 3253f82a9901SFilipe Manana u64 drop_start; 325431840ae1SZheng Yan 3255c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3256c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3257c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3258c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3259c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3260c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3261d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3262d397712bSChris Mason extent); 3263d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3264d397712bSChris Mason extent); 3265c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3266d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3267d397712bSChris Mason extent); 3268c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3269c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3270c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3271c5c9cd4dSSage Weil extent); 3272c5c9cd4dSSage Weil } 327331840ae1SZheng Yan 32742c463823SFilipe Manana /* 32752c463823SFilipe Manana * The first search might have left us at an extent 32762c463823SFilipe Manana * item that ends before our target range's start, can 32772c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 32782c463823SFilipe Manana */ 32792c463823SFilipe Manana if (key.offset + datal <= off) { 3280e4355f34SFilipe David Borba Manana path->slots[0]++; 3281e4355f34SFilipe David Borba Manana goto process_slot; 32822c463823SFilipe Manana } else if (key.offset >= off + len) { 32832c463823SFilipe Manana break; 3284e4355f34SFilipe David Borba Manana } 3285e4355f34SFilipe David Borba Manana 3286e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3287e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3288e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3289e4355f34SFilipe David Borba Manana size); 3290e4355f34SFilipe David Borba Manana 3291e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3292e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3293c5c9cd4dSSage Weil 329431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 329533345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 32964d728ec7SLi Zefan if (off <= key.offset) 3297c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 32984d728ec7SLi Zefan else 32994d728ec7SLi Zefan new_key.offset = destoff; 3300c5c9cd4dSSage Weil 3301b6f3409bSSage Weil /* 3302f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3303f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3304f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3305f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3306f82a9901SFilipe Manana * partially overlaps it). 3307f82a9901SFilipe Manana */ 3308f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3309f82a9901SFilipe Manana drop_start = last_dest_end; 3310f82a9901SFilipe Manana else 3311f82a9901SFilipe Manana drop_start = new_key.offset; 3312f82a9901SFilipe Manana 3313f82a9901SFilipe Manana /* 3314b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3315b6f3409bSSage Weil * 1 - add new extent 3316b6f3409bSSage Weil * 1 - inode update 3317b6f3409bSSage Weil */ 3318b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3319a22285a6SYan, Zheng if (IS_ERR(trans)) { 3320a22285a6SYan, Zheng ret = PTR_ERR(trans); 3321a22285a6SYan, Zheng goto out; 3322a22285a6SYan, Zheng } 3323a22285a6SYan, Zheng 3324c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3325c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3326d72c0842SLi Zefan /* 3327d72c0842SLi Zefan * a | --- range to clone ---| b 3328d72c0842SLi Zefan * | ------------- extent ------------- | 3329d72c0842SLi Zefan */ 3330d72c0842SLi Zefan 333193915584SAntonio Ospite /* subtract range b */ 3332d72c0842SLi Zefan if (key.offset + datal > off + len) 3333d72c0842SLi Zefan datal = off + len - key.offset; 3334d72c0842SLi Zefan 333593915584SAntonio Ospite /* subtract range a */ 3336a22285a6SYan, Zheng if (off > key.offset) { 3337a22285a6SYan, Zheng datao += off - key.offset; 3338a22285a6SYan, Zheng datal -= off - key.offset; 3339a22285a6SYan, Zheng } 3340a22285a6SYan, Zheng 33415dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3342f82a9901SFilipe Manana drop_start, 3343a22285a6SYan, Zheng new_key.offset + datal, 33442671485dSJosef Bacik 1); 334579787eaaSJeff Mahoney if (ret) { 33463f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 334700fdf13aSLiu Bo btrfs_abort_transaction(trans, 334800fdf13aSLiu Bo root, ret); 334979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 335079787eaaSJeff Mahoney goto out; 335179787eaaSJeff Mahoney } 3352a22285a6SYan, Zheng 335331840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 335431840ae1SZheng Yan &new_key, size); 335579787eaaSJeff Mahoney if (ret) { 335679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 335779787eaaSJeff Mahoney ret); 335879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 335979787eaaSJeff Mahoney goto out; 336079787eaaSJeff Mahoney } 336131840ae1SZheng Yan 336231840ae1SZheng Yan leaf = path->nodes[0]; 336331840ae1SZheng Yan slot = path->slots[0]; 336431840ae1SZheng Yan write_extent_buffer(leaf, buf, 336531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 336631840ae1SZheng Yan size); 3367ae01a0abSYan Zheng 3368f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3369f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3370c5c9cd4dSSage Weil 3371c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3372c5c9cd4dSSage Weil if (!disko) 3373c5c9cd4dSSage Weil datao = 0; 3374c5c9cd4dSSage Weil 3375c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3376c5c9cd4dSSage Weil datao); 3377c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3378c5c9cd4dSSage Weil datal); 3379fcebe456SJosef Bacik 3380fcebe456SJosef Bacik /* 3381fcebe456SJosef Bacik * We need to look up the roots that point at 3382fcebe456SJosef Bacik * this bytenr and see if the new root does. If 3383fcebe456SJosef Bacik * it does not we need to make sure we update 3384fcebe456SJosef Bacik * quotas appropriately. 3385fcebe456SJosef Bacik */ 3386fcebe456SJosef Bacik if (disko && root != BTRFS_I(src)->root && 3387fcebe456SJosef Bacik disko != last_disko) { 3388fcebe456SJosef Bacik no_quota = check_ref(trans, root, 3389fcebe456SJosef Bacik disko); 3390fcebe456SJosef Bacik if (no_quota < 0) { 3391fcebe456SJosef Bacik btrfs_abort_transaction(trans, 3392fcebe456SJosef Bacik root, 3393fcebe456SJosef Bacik ret); 3394fcebe456SJosef Bacik btrfs_end_transaction(trans, 3395fcebe456SJosef Bacik root); 3396fcebe456SJosef Bacik ret = no_quota; 3397fcebe456SJosef Bacik goto out; 3398fcebe456SJosef Bacik } 3399fcebe456SJosef Bacik } 3400fcebe456SJosef Bacik 3401c5c9cd4dSSage Weil if (disko) { 3402c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3403ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 34045d4f98a2SYan Zheng disko, diskl, 0, 3405f46b5a66SChristoph Hellwig root->root_key.objectid, 340633345d01SLi Zefan btrfs_ino(inode), 340766d7e7f0SArne Jansen new_key.offset - datao, 3408fcebe456SJosef Bacik no_quota); 340979787eaaSJeff Mahoney if (ret) { 341079787eaaSJeff Mahoney btrfs_abort_transaction(trans, 341179787eaaSJeff Mahoney root, 341279787eaaSJeff Mahoney ret); 341379787eaaSJeff Mahoney btrfs_end_transaction(trans, 341479787eaaSJeff Mahoney root); 341579787eaaSJeff Mahoney goto out; 341679787eaaSJeff Mahoney 341779787eaaSJeff Mahoney } 3418f46b5a66SChristoph Hellwig } 3419c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3420c5c9cd4dSSage Weil u64 skip = 0; 3421c5c9cd4dSSage Weil u64 trim = 0; 3422d3ecfcdfSLiu Bo u64 aligned_end = 0; 3423d3ecfcdfSLiu Bo 3424c5c9cd4dSSage Weil if (off > key.offset) { 3425c5c9cd4dSSage Weil skip = off - key.offset; 3426c5c9cd4dSSage Weil new_key.offset += skip; 342731840ae1SZheng Yan } 3428d397712bSChris Mason 3429c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3430c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3431d397712bSChris Mason 3432c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3433c5c9cd4dSSage Weil ret = -EINVAL; 3434a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3435c5c9cd4dSSage Weil goto out; 343631840ae1SZheng Yan } 3437c5c9cd4dSSage Weil size -= skip + trim; 3438c5c9cd4dSSage Weil datal -= skip + trim; 3439a22285a6SYan, Zheng 3440d3ecfcdfSLiu Bo aligned_end = ALIGN(new_key.offset + datal, 3441d3ecfcdfSLiu Bo root->sectorsize); 34425dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3443f82a9901SFilipe Manana drop_start, 3444d3ecfcdfSLiu Bo aligned_end, 34452671485dSJosef Bacik 1); 344679787eaaSJeff Mahoney if (ret) { 34473f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 34483a29bc09SChris Mason btrfs_abort_transaction(trans, 34493a29bc09SChris Mason root, ret); 345079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 345179787eaaSJeff Mahoney goto out; 345279787eaaSJeff Mahoney } 3453a22285a6SYan, Zheng 3454c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3455c5c9cd4dSSage Weil &new_key, size); 345679787eaaSJeff Mahoney if (ret) { 345779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 345879787eaaSJeff Mahoney ret); 345979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 346079787eaaSJeff Mahoney goto out; 346179787eaaSJeff Mahoney } 3462c5c9cd4dSSage Weil 3463c5c9cd4dSSage Weil if (skip) { 3464d397712bSChris Mason u32 start = 3465d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3466c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3467c5c9cd4dSSage Weil datal); 3468c5c9cd4dSSage Weil } 3469c5c9cd4dSSage Weil 3470c5c9cd4dSSage Weil leaf = path->nodes[0]; 3471c5c9cd4dSSage Weil slot = path->slots[0]; 3472c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3473c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3474c5c9cd4dSSage Weil size); 3475c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3476c5c9cd4dSSage Weil } 3477c5c9cd4dSSage Weil 34787ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 34797ffbb598SFilipe Manana if (drop_start < new_key.offset) 34807ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 348114f59796SFilipe Manana NULL, drop_start, 34827ffbb598SFilipe Manana new_key.offset - drop_start); 34837ffbb598SFilipe Manana 348414f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 34857ffbb598SFilipe Manana 3486c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3487b3b4aa74SDavid Sterba btrfs_release_path(path); 3488c5c9cd4dSSage Weil 348962e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 349062e2390eSFilipe Manana root->sectorsize); 3491f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3492f82a9901SFilipe Manana last_dest_end, 3493f82a9901SFilipe Manana destoff, olen); 3494f82a9901SFilipe Manana if (ret) 349579787eaaSJeff Mahoney goto out; 34962c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 34972c463823SFilipe Manana break; 3498a22285a6SYan, Zheng } 3499b3b4aa74SDavid Sterba btrfs_release_path(path); 3500ae01a0abSYan Zheng key.offset++; 3501ae01a0abSYan Zheng } 3502f46b5a66SChristoph Hellwig ret = 0; 350332b7c687SMark Fasheh 3504f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3505f82a9901SFilipe Manana /* 3506f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3507f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3508f82a9901SFilipe Manana */ 3509b3b4aa74SDavid Sterba btrfs_release_path(path); 3510f82a9901SFilipe Manana 3511f82a9901SFilipe Manana /* 3512f82a9901SFilipe Manana * 1 - remove extent(s) 3513f82a9901SFilipe Manana * 1 - inode update 3514f82a9901SFilipe Manana */ 3515f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3516f82a9901SFilipe Manana if (IS_ERR(trans)) { 3517f82a9901SFilipe Manana ret = PTR_ERR(trans); 3518f82a9901SFilipe Manana goto out; 3519f82a9901SFilipe Manana } 3520f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3521f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3522f82a9901SFilipe Manana if (ret) { 3523f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3524f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3525f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3526f82a9901SFilipe Manana goto out; 3527f82a9901SFilipe Manana } 352814f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 352914f59796SFilipe Manana destoff + len - last_dest_end); 3530f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 3531f82a9901SFilipe Manana destoff, olen); 3532f82a9901SFilipe Manana } 3533f82a9901SFilipe Manana 3534f46b5a66SChristoph Hellwig out: 353532b7c687SMark Fasheh btrfs_free_path(path); 353632b7c687SMark Fasheh vfree(buf); 353732b7c687SMark Fasheh return ret; 353832b7c687SMark Fasheh } 353932b7c687SMark Fasheh 354032b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 354132b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 354232b7c687SMark Fasheh { 354354563d41SAl Viro struct inode *inode = file_inode(file); 354432b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 354532b7c687SMark Fasheh struct fd src_file; 354632b7c687SMark Fasheh struct inode *src; 354732b7c687SMark Fasheh int ret; 354832b7c687SMark Fasheh u64 len = olen; 354932b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 355032b7c687SMark Fasheh int same_inode = 0; 355132b7c687SMark Fasheh 355232b7c687SMark Fasheh /* 355332b7c687SMark Fasheh * TODO: 355432b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 355532b7c687SMark Fasheh * decompress into destination's address_space (the file offset 355632b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 355732b7c687SMark Fasheh * otherwise reinsert) a subrange. 355800fdf13aSLiu Bo * 355900fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 356000fdf13aSLiu Bo * be either compressed or non-compressed. 356132b7c687SMark Fasheh */ 356232b7c687SMark Fasheh 356332b7c687SMark Fasheh /* the destination must be opened for writing */ 356432b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 356532b7c687SMark Fasheh return -EINVAL; 356632b7c687SMark Fasheh 356732b7c687SMark Fasheh if (btrfs_root_readonly(root)) 356832b7c687SMark Fasheh return -EROFS; 356932b7c687SMark Fasheh 357032b7c687SMark Fasheh ret = mnt_want_write_file(file); 357132b7c687SMark Fasheh if (ret) 357232b7c687SMark Fasheh return ret; 357332b7c687SMark Fasheh 357432b7c687SMark Fasheh src_file = fdget(srcfd); 357532b7c687SMark Fasheh if (!src_file.file) { 357632b7c687SMark Fasheh ret = -EBADF; 357732b7c687SMark Fasheh goto out_drop_write; 357832b7c687SMark Fasheh } 357932b7c687SMark Fasheh 358032b7c687SMark Fasheh ret = -EXDEV; 358132b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 358232b7c687SMark Fasheh goto out_fput; 358332b7c687SMark Fasheh 358432b7c687SMark Fasheh src = file_inode(src_file.file); 358532b7c687SMark Fasheh 358632b7c687SMark Fasheh ret = -EINVAL; 358732b7c687SMark Fasheh if (src == inode) 358832b7c687SMark Fasheh same_inode = 1; 358932b7c687SMark Fasheh 359032b7c687SMark Fasheh /* the src must be open for reading */ 359132b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 359232b7c687SMark Fasheh goto out_fput; 359332b7c687SMark Fasheh 359432b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 359532b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 359632b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 359732b7c687SMark Fasheh goto out_fput; 359832b7c687SMark Fasheh 359932b7c687SMark Fasheh ret = -EISDIR; 360032b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 360132b7c687SMark Fasheh goto out_fput; 360232b7c687SMark Fasheh 360332b7c687SMark Fasheh ret = -EXDEV; 360432b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 360532b7c687SMark Fasheh goto out_fput; 360632b7c687SMark Fasheh 360732b7c687SMark Fasheh if (!same_inode) { 360832b7c687SMark Fasheh if (inode < src) { 360932b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 361032b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 361132b7c687SMark Fasheh } else { 361232b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 361332b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 361432b7c687SMark Fasheh } 361532b7c687SMark Fasheh } else { 361632b7c687SMark Fasheh mutex_lock(&src->i_mutex); 361732b7c687SMark Fasheh } 361832b7c687SMark Fasheh 361932b7c687SMark Fasheh /* determine range to clone */ 362032b7c687SMark Fasheh ret = -EINVAL; 362132b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 362232b7c687SMark Fasheh goto out_unlock; 362332b7c687SMark Fasheh if (len == 0) 362432b7c687SMark Fasheh olen = len = src->i_size - off; 362532b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 362632b7c687SMark Fasheh if (off + len == src->i_size) 362732b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 362832b7c687SMark Fasheh 362932b7c687SMark Fasheh /* verify the end result is block aligned */ 363032b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 363132b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 363232b7c687SMark Fasheh goto out_unlock; 363332b7c687SMark Fasheh 363432b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 363532b7c687SMark Fasheh if (same_inode) { 363632b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 363732b7c687SMark Fasheh goto out_unlock; 363832b7c687SMark Fasheh } 363932b7c687SMark Fasheh 364032b7c687SMark Fasheh if (destoff > inode->i_size) { 364132b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 364232b7c687SMark Fasheh if (ret) 364332b7c687SMark Fasheh goto out_unlock; 364432b7c687SMark Fasheh } 364532b7c687SMark Fasheh 3646c125b8bfSFilipe Manana /* 3647c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3648c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3649c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3650c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3651c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3652c125b8bfSFilipe Manana */ 3653c125b8bfSFilipe Manana if (same_inode) { 3654c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3655c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 365632b7c687SMark Fasheh 3657c125b8bfSFilipe Manana lock_extent_range(src, lock_start, lock_len); 3658c125b8bfSFilipe Manana } else { 365932b7c687SMark Fasheh lock_extent_range(src, off, len); 3660c125b8bfSFilipe Manana lock_extent_range(inode, destoff, len); 3661c125b8bfSFilipe Manana } 366232b7c687SMark Fasheh 366332b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 366432b7c687SMark Fasheh 3665c125b8bfSFilipe Manana if (same_inode) { 3666c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3667c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3668c125b8bfSFilipe Manana 3669c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3670c125b8bfSFilipe Manana } else { 3671aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3672c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(inode)->io_tree, destoff, 3673c125b8bfSFilipe Manana destoff + len - 1); 3674c125b8bfSFilipe Manana } 3675c125b8bfSFilipe Manana /* 3676c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3677c125b8bfSFilipe Manana * data immediately and not the previous data. 3678c125b8bfSFilipe Manana */ 3679c125b8bfSFilipe Manana truncate_inode_pages_range(&inode->i_data, destoff, 3680c125b8bfSFilipe Manana PAGE_CACHE_ALIGN(destoff + len) - 1); 3681f46b5a66SChristoph Hellwig out_unlock: 3682c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3683c57c2b3eSFilipe David Borba Manana if (inode < src) { 3684f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3685f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3686c57c2b3eSFilipe David Borba Manana } else { 3687c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3688c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3689c57c2b3eSFilipe David Borba Manana } 3690c57c2b3eSFilipe David Borba Manana } else { 3691c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3692c57c2b3eSFilipe David Borba Manana } 3693f46b5a66SChristoph Hellwig out_fput: 36942903ff01SAl Viro fdput(src_file); 3695ab67b7c1SYan Zheng out_drop_write: 36962a79f17eSAl Viro mnt_drop_write_file(file); 3697f46b5a66SChristoph Hellwig return ret; 3698f46b5a66SChristoph Hellwig } 3699f46b5a66SChristoph Hellwig 37007a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3701c5c9cd4dSSage Weil { 3702c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3703c5c9cd4dSSage Weil 37047a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3705c5c9cd4dSSage Weil return -EFAULT; 3706c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3707c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3708c5c9cd4dSSage Weil } 3709c5c9cd4dSSage Weil 3710f46b5a66SChristoph Hellwig /* 3711f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3712f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3713f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3714f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3715f46b5a66SChristoph Hellwig */ 3716b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3717f46b5a66SChristoph Hellwig { 3718496ad9aaSAl Viro struct inode *inode = file_inode(file); 3719f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3720f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 37211ab86aedSSage Weil int ret; 3722f46b5a66SChristoph Hellwig 37231ab86aedSSage Weil ret = -EPERM; 3724df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3725f46b5a66SChristoph Hellwig goto out; 37261ab86aedSSage Weil 37271ab86aedSSage Weil ret = -EINPROGRESS; 37281ab86aedSSage Weil if (file->private_data) 37291ab86aedSSage Weil goto out; 37309ca9ee09SSage Weil 3731b83cc969SLi Zefan ret = -EROFS; 3732b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3733b83cc969SLi Zefan goto out; 3734b83cc969SLi Zefan 3735a561be71SAl Viro ret = mnt_want_write_file(file); 3736c146afadSYan Zheng if (ret) 3737c146afadSYan Zheng goto out; 3738c146afadSYan Zheng 3739a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 37409ca9ee09SSage Weil 3741f46b5a66SChristoph Hellwig ret = -ENOMEM; 37427a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3743abd30bb0STsutomu Itoh if (IS_ERR(trans)) 37441ab86aedSSage Weil goto out_drop; 37451ab86aedSSage Weil 37461ab86aedSSage Weil file->private_data = trans; 37471ab86aedSSage Weil return 0; 37481ab86aedSSage Weil 37491ab86aedSSage Weil out_drop: 3750a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 37512a79f17eSAl Viro mnt_drop_write_file(file); 3752f46b5a66SChristoph Hellwig out: 3753f46b5a66SChristoph Hellwig return ret; 3754f46b5a66SChristoph Hellwig } 3755f46b5a66SChristoph Hellwig 37566ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37576ef5ed0dSJosef Bacik { 3758496ad9aaSAl Viro struct inode *inode = file_inode(file); 37596ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37606ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37616ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37626ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37636ef5ed0dSJosef Bacik struct btrfs_path *path; 37646ef5ed0dSJosef Bacik struct btrfs_key location; 37656ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37666ef5ed0dSJosef Bacik u64 objectid = 0; 37676ef5ed0dSJosef Bacik u64 dir_id; 37683c04ce01SMiao Xie int ret; 37696ef5ed0dSJosef Bacik 37706ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37716ef5ed0dSJosef Bacik return -EPERM; 37726ef5ed0dSJosef Bacik 37733c04ce01SMiao Xie ret = mnt_want_write_file(file); 37743c04ce01SMiao Xie if (ret) 37753c04ce01SMiao Xie return ret; 37763c04ce01SMiao Xie 37773c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37783c04ce01SMiao Xie ret = -EFAULT; 37793c04ce01SMiao Xie goto out; 37803c04ce01SMiao Xie } 37816ef5ed0dSJosef Bacik 37826ef5ed0dSJosef Bacik if (!objectid) 37831cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 37846ef5ed0dSJosef Bacik 37856ef5ed0dSJosef Bacik location.objectid = objectid; 37866ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 37876ef5ed0dSJosef Bacik location.offset = (u64)-1; 37886ef5ed0dSJosef Bacik 37896ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 37903c04ce01SMiao Xie if (IS_ERR(new_root)) { 37913c04ce01SMiao Xie ret = PTR_ERR(new_root); 37923c04ce01SMiao Xie goto out; 37933c04ce01SMiao Xie } 37946ef5ed0dSJosef Bacik 37956ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 37963c04ce01SMiao Xie if (!path) { 37973c04ce01SMiao Xie ret = -ENOMEM; 37983c04ce01SMiao Xie goto out; 37993c04ce01SMiao Xie } 38006ef5ed0dSJosef Bacik path->leave_spinning = 1; 38016ef5ed0dSJosef Bacik 38026ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 380398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38046ef5ed0dSJosef Bacik btrfs_free_path(path); 38053c04ce01SMiao Xie ret = PTR_ERR(trans); 38063c04ce01SMiao Xie goto out; 38076ef5ed0dSJosef Bacik } 38086ef5ed0dSJosef Bacik 38096c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 38106ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 38116ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3812cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38136ef5ed0dSJosef Bacik btrfs_free_path(path); 38146ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3815efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3816efe120a0SFrank Holton "item, this isn't going to work"); 38173c04ce01SMiao Xie ret = -ENOENT; 38183c04ce01SMiao Xie goto out; 38196ef5ed0dSJosef Bacik } 38206ef5ed0dSJosef Bacik 38216ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38226ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38236ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38246ef5ed0dSJosef Bacik btrfs_free_path(path); 38256ef5ed0dSJosef Bacik 38262b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 38276ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 38283c04ce01SMiao Xie out: 38293c04ce01SMiao Xie mnt_drop_write_file(file); 38303c04ce01SMiao Xie return ret; 38316ef5ed0dSJosef Bacik } 38326ef5ed0dSJosef Bacik 38335af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3834bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3835bf5fc093SJosef Bacik { 3836bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3837bf5fc093SJosef Bacik 3838bf5fc093SJosef Bacik space->total_bytes = 0; 3839bf5fc093SJosef Bacik space->used_bytes = 0; 3840bf5fc093SJosef Bacik space->flags = 0; 3841bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3842bf5fc093SJosef Bacik space->flags = block_group->flags; 3843bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3844bf5fc093SJosef Bacik space->used_bytes += 3845bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3846bf5fc093SJosef Bacik } 3847bf5fc093SJosef Bacik } 3848bf5fc093SJosef Bacik 384948a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 38501406e432SJosef Bacik { 38511406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38521406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38531406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38547fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 385513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38561406e432SJosef Bacik struct btrfs_space_info *info; 3857bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3858bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3859bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3860bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3861bf5fc093SJosef Bacik int num_types = 4; 38627fde62bfSChris Mason int alloc_size; 38631406e432SJosef Bacik int ret = 0; 386451788b1bSDan Rosenberg u64 slot_count = 0; 3865bf5fc093SJosef Bacik int i, c; 38661406e432SJosef Bacik 38671406e432SJosef Bacik if (copy_from_user(&space_args, 38681406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38691406e432SJosef Bacik sizeof(space_args))) 38701406e432SJosef Bacik return -EFAULT; 38711406e432SJosef Bacik 3872bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3873bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3874bf5fc093SJosef Bacik 3875bf5fc093SJosef Bacik info = NULL; 38767fde62bfSChris Mason rcu_read_lock(); 3877bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3878bf5fc093SJosef Bacik list) { 3879bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3880bf5fc093SJosef Bacik info = tmp; 3881bf5fc093SJosef Bacik break; 3882bf5fc093SJosef Bacik } 3883bf5fc093SJosef Bacik } 38847fde62bfSChris Mason rcu_read_unlock(); 38851406e432SJosef Bacik 3886bf5fc093SJosef Bacik if (!info) 3887bf5fc093SJosef Bacik continue; 3888bf5fc093SJosef Bacik 3889bf5fc093SJosef Bacik down_read(&info->groups_sem); 3890bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3891bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3892bf5fc093SJosef Bacik slot_count++; 3893bf5fc093SJosef Bacik } 3894bf5fc093SJosef Bacik up_read(&info->groups_sem); 3895bf5fc093SJosef Bacik } 3896bf5fc093SJosef Bacik 389736523e95SDavid Sterba /* 389836523e95SDavid Sterba * Global block reserve, exported as a space_info 389936523e95SDavid Sterba */ 390036523e95SDavid Sterba slot_count++; 390136523e95SDavid Sterba 39027fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39037fde62bfSChris Mason if (space_args.space_slots == 0) { 39047fde62bfSChris Mason space_args.total_spaces = slot_count; 39057fde62bfSChris Mason goto out; 39067fde62bfSChris Mason } 3907bf5fc093SJosef Bacik 390851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3909bf5fc093SJosef Bacik 39107fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3911bf5fc093SJosef Bacik 39127fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39137fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39147fde62bfSChris Mason */ 39157fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 39167fde62bfSChris Mason return -ENOMEM; 39177fde62bfSChris Mason 39187fde62bfSChris Mason space_args.total_spaces = 0; 39197fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 39207fde62bfSChris Mason if (!dest) 39217fde62bfSChris Mason return -ENOMEM; 39227fde62bfSChris Mason dest_orig = dest; 39237fde62bfSChris Mason 39247fde62bfSChris Mason /* now we have a buffer to copy into */ 3925bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3926bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3927bf5fc093SJosef Bacik 392851788b1bSDan Rosenberg if (!slot_count) 392951788b1bSDan Rosenberg break; 393051788b1bSDan Rosenberg 3931bf5fc093SJosef Bacik info = NULL; 39321406e432SJosef Bacik rcu_read_lock(); 3933bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3934bf5fc093SJosef Bacik list) { 3935bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3936bf5fc093SJosef Bacik info = tmp; 39377fde62bfSChris Mason break; 3938bf5fc093SJosef Bacik } 3939bf5fc093SJosef Bacik } 3940bf5fc093SJosef Bacik rcu_read_unlock(); 39417fde62bfSChris Mason 3942bf5fc093SJosef Bacik if (!info) 3943bf5fc093SJosef Bacik continue; 3944bf5fc093SJosef Bacik down_read(&info->groups_sem); 3945bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3946bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 39475af3e8ccSStefan Behrens btrfs_get_block_group_info( 39485af3e8ccSStefan Behrens &info->block_groups[c], &space); 39497fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39501406e432SJosef Bacik dest++; 39511406e432SJosef Bacik space_args.total_spaces++; 395251788b1bSDan Rosenberg slot_count--; 39531406e432SJosef Bacik } 395451788b1bSDan Rosenberg if (!slot_count) 395551788b1bSDan Rosenberg break; 3956bf5fc093SJosef Bacik } 3957bf5fc093SJosef Bacik up_read(&info->groups_sem); 3958bf5fc093SJosef Bacik } 39591406e432SJosef Bacik 396036523e95SDavid Sterba /* 396136523e95SDavid Sterba * Add global block reserve 396236523e95SDavid Sterba */ 396336523e95SDavid Sterba if (slot_count) { 396436523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 396536523e95SDavid Sterba 396636523e95SDavid Sterba spin_lock(&block_rsv->lock); 396736523e95SDavid Sterba space.total_bytes = block_rsv->size; 396836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 396936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 397036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 397136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 397236523e95SDavid Sterba space_args.total_spaces++; 397336523e95SDavid Sterba } 397436523e95SDavid Sterba 39752eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39767fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39777fde62bfSChris Mason 39787fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39797fde62bfSChris Mason ret = -EFAULT; 39807fde62bfSChris Mason 39817fde62bfSChris Mason kfree(dest_orig); 39827fde62bfSChris Mason out: 39837fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39841406e432SJosef Bacik ret = -EFAULT; 39851406e432SJosef Bacik 39861406e432SJosef Bacik return ret; 39871406e432SJosef Bacik } 39881406e432SJosef Bacik 3989f46b5a66SChristoph Hellwig /* 3990f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3991f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3992f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3993f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3994f46b5a66SChristoph Hellwig */ 3995f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3996f46b5a66SChristoph Hellwig { 3997496ad9aaSAl Viro struct inode *inode = file_inode(file); 3998f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3999f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4000f46b5a66SChristoph Hellwig 4001f46b5a66SChristoph Hellwig trans = file->private_data; 40021ab86aedSSage Weil if (!trans) 40031ab86aedSSage Weil return -EINVAL; 4004b214107eSChristoph Hellwig file->private_data = NULL; 40059ca9ee09SSage Weil 40061ab86aedSSage Weil btrfs_end_transaction(trans, root); 40071ab86aedSSage Weil 4008a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 40099ca9ee09SSage Weil 40102a79f17eSAl Viro mnt_drop_write_file(file); 40111ab86aedSSage Weil return 0; 4012f46b5a66SChristoph Hellwig } 4013f46b5a66SChristoph Hellwig 40149a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40159a8c28beSMiao Xie void __user *argp) 401646204592SSage Weil { 401746204592SSage Weil struct btrfs_trans_handle *trans; 401846204592SSage Weil u64 transid; 4019db5b493aSTsutomu Itoh int ret; 402046204592SSage Weil 4021d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4022ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4023ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 402498d5dc13STsutomu Itoh return PTR_ERR(trans); 4025ff7c1d33SMiao Xie 4026ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4027ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4028ff7c1d33SMiao Xie goto out; 4029ff7c1d33SMiao Xie } 403046204592SSage Weil transid = trans->transid; 4031db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 40328b2b2d3cSTsutomu Itoh if (ret) { 40338b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4034db5b493aSTsutomu Itoh return ret; 40358b2b2d3cSTsutomu Itoh } 4036ff7c1d33SMiao Xie out: 403746204592SSage Weil if (argp) 403846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 403946204592SSage Weil return -EFAULT; 404046204592SSage Weil return 0; 404146204592SSage Weil } 404246204592SSage Weil 40439a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 40449a8c28beSMiao Xie void __user *argp) 404546204592SSage Weil { 404646204592SSage Weil u64 transid; 404746204592SSage Weil 404846204592SSage Weil if (argp) { 404946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 405046204592SSage Weil return -EFAULT; 405146204592SSage Weil } else { 405246204592SSage Weil transid = 0; /* current trans */ 405346204592SSage Weil } 405446204592SSage Weil return btrfs_wait_for_commit(root, transid); 405546204592SSage Weil } 405646204592SSage Weil 4057b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4058475f6387SJan Schmidt { 4059496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4060475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4061b8e95489SMiao Xie int ret; 4062475f6387SJan Schmidt 4063475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4064475f6387SJan Schmidt return -EPERM; 4065475f6387SJan Schmidt 4066475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4067475f6387SJan Schmidt if (IS_ERR(sa)) 4068475f6387SJan Schmidt return PTR_ERR(sa); 4069475f6387SJan Schmidt 4070b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4071b8e95489SMiao Xie ret = mnt_want_write_file(file); 4072b8e95489SMiao Xie if (ret) 4073b8e95489SMiao Xie goto out; 4074b8e95489SMiao Xie } 4075b8e95489SMiao Xie 4076aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 407763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 407863a212abSStefan Behrens 0); 4079475f6387SJan Schmidt 4080475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4081475f6387SJan Schmidt ret = -EFAULT; 4082475f6387SJan Schmidt 4083b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4084b8e95489SMiao Xie mnt_drop_write_file(file); 4085b8e95489SMiao Xie out: 4086475f6387SJan Schmidt kfree(sa); 4087475f6387SJan Schmidt return ret; 4088475f6387SJan Schmidt } 4089475f6387SJan Schmidt 4090475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4091475f6387SJan Schmidt { 4092475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4093475f6387SJan Schmidt return -EPERM; 4094475f6387SJan Schmidt 4095aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4096475f6387SJan Schmidt } 4097475f6387SJan Schmidt 4098475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4099475f6387SJan Schmidt void __user *arg) 4100475f6387SJan Schmidt { 4101475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4102475f6387SJan Schmidt int ret; 4103475f6387SJan Schmidt 4104475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4105475f6387SJan Schmidt return -EPERM; 4106475f6387SJan Schmidt 4107475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4108475f6387SJan Schmidt if (IS_ERR(sa)) 4109475f6387SJan Schmidt return PTR_ERR(sa); 4110475f6387SJan Schmidt 4111475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4112475f6387SJan Schmidt 4113475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4114475f6387SJan Schmidt ret = -EFAULT; 4115475f6387SJan Schmidt 4116475f6387SJan Schmidt kfree(sa); 4117475f6387SJan Schmidt return ret; 4118475f6387SJan Schmidt } 4119475f6387SJan Schmidt 4120c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4121b27f7c0cSDavid Sterba void __user *arg) 4122c11d2c23SStefan Behrens { 4123c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4124c11d2c23SStefan Behrens int ret; 4125c11d2c23SStefan Behrens 4126c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4127c11d2c23SStefan Behrens if (IS_ERR(sa)) 4128c11d2c23SStefan Behrens return PTR_ERR(sa); 4129c11d2c23SStefan Behrens 4130b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4131b27f7c0cSDavid Sterba kfree(sa); 4132b27f7c0cSDavid Sterba return -EPERM; 4133b27f7c0cSDavid Sterba } 4134b27f7c0cSDavid Sterba 4135b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4136c11d2c23SStefan Behrens 4137c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4138c11d2c23SStefan Behrens ret = -EFAULT; 4139c11d2c23SStefan Behrens 4140c11d2c23SStefan Behrens kfree(sa); 4141c11d2c23SStefan Behrens return ret; 4142c11d2c23SStefan Behrens } 4143c11d2c23SStefan Behrens 41443f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 41453f6bcfbdSStefan Behrens { 41463f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41473f6bcfbdSStefan Behrens int ret; 41483f6bcfbdSStefan Behrens 41493f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41503f6bcfbdSStefan Behrens return -EPERM; 41513f6bcfbdSStefan Behrens 41523f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41533f6bcfbdSStefan Behrens if (IS_ERR(p)) 41543f6bcfbdSStefan Behrens return PTR_ERR(p); 41553f6bcfbdSStefan Behrens 41563f6bcfbdSStefan Behrens switch (p->cmd) { 41573f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4158adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4159adfa97cbSIlya Dryomov ret = -EROFS; 4160adfa97cbSIlya Dryomov goto out; 4161adfa97cbSIlya Dryomov } 41623f6bcfbdSStefan Behrens if (atomic_xchg( 41633f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41643f6bcfbdSStefan Behrens 1)) { 4165e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41663f6bcfbdSStefan Behrens } else { 41673f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 41683f6bcfbdSStefan Behrens atomic_set( 41693f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 41703f6bcfbdSStefan Behrens 0); 41713f6bcfbdSStefan Behrens } 41723f6bcfbdSStefan Behrens break; 41733f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41743f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 41753f6bcfbdSStefan Behrens ret = 0; 41763f6bcfbdSStefan Behrens break; 41773f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 41783f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 41793f6bcfbdSStefan Behrens break; 41803f6bcfbdSStefan Behrens default: 41813f6bcfbdSStefan Behrens ret = -EINVAL; 41823f6bcfbdSStefan Behrens break; 41833f6bcfbdSStefan Behrens } 41843f6bcfbdSStefan Behrens 41853f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 41863f6bcfbdSStefan Behrens ret = -EFAULT; 4187adfa97cbSIlya Dryomov out: 41883f6bcfbdSStefan Behrens kfree(p); 41893f6bcfbdSStefan Behrens return ret; 41903f6bcfbdSStefan Behrens } 41913f6bcfbdSStefan Behrens 4192d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4193d7728c96SJan Schmidt { 4194d7728c96SJan Schmidt int ret = 0; 4195d7728c96SJan Schmidt int i; 4196740c3d22SChris Mason u64 rel_ptr; 4197d7728c96SJan Schmidt int size; 4198806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4199d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4200d7728c96SJan Schmidt struct btrfs_path *path; 4201d7728c96SJan Schmidt 420282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4203d7728c96SJan Schmidt return -EPERM; 4204d7728c96SJan Schmidt 4205d7728c96SJan Schmidt path = btrfs_alloc_path(); 4206d7728c96SJan Schmidt if (!path) { 4207d7728c96SJan Schmidt ret = -ENOMEM; 4208d7728c96SJan Schmidt goto out; 4209d7728c96SJan Schmidt } 4210d7728c96SJan Schmidt 4211d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4212d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4213d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4214d7728c96SJan Schmidt ipa = NULL; 4215d7728c96SJan Schmidt goto out; 4216d7728c96SJan Schmidt } 4217d7728c96SJan Schmidt 4218d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4219d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4220d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4221d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4222d7728c96SJan Schmidt ipath = NULL; 4223d7728c96SJan Schmidt goto out; 4224d7728c96SJan Schmidt } 4225d7728c96SJan Schmidt 4226d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4227d7728c96SJan Schmidt if (ret < 0) 4228d7728c96SJan Schmidt goto out; 4229d7728c96SJan Schmidt 4230d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4231745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4232745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4233740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4234d7728c96SJan Schmidt } 4235d7728c96SJan Schmidt 4236745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4237745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4238d7728c96SJan Schmidt if (ret) { 4239d7728c96SJan Schmidt ret = -EFAULT; 4240d7728c96SJan Schmidt goto out; 4241d7728c96SJan Schmidt } 4242d7728c96SJan Schmidt 4243d7728c96SJan Schmidt out: 4244d7728c96SJan Schmidt btrfs_free_path(path); 4245d7728c96SJan Schmidt free_ipath(ipath); 4246d7728c96SJan Schmidt kfree(ipa); 4247d7728c96SJan Schmidt 4248d7728c96SJan Schmidt return ret; 4249d7728c96SJan Schmidt } 4250d7728c96SJan Schmidt 4251d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4252d7728c96SJan Schmidt { 4253d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4254d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4255d7728c96SJan Schmidt 4256d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4257d7728c96SJan Schmidt inodes->bytes_left -= c; 4258d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4259d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4260d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4261d7728c96SJan Schmidt inodes->elem_cnt += 3; 4262d7728c96SJan Schmidt } else { 4263d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4264d7728c96SJan Schmidt inodes->bytes_left = 0; 4265d7728c96SJan Schmidt inodes->elem_missed += 3; 4266d7728c96SJan Schmidt } 4267d7728c96SJan Schmidt 4268d7728c96SJan Schmidt return 0; 4269d7728c96SJan Schmidt } 4270d7728c96SJan Schmidt 4271d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4272d7728c96SJan Schmidt void __user *arg) 4273d7728c96SJan Schmidt { 4274d7728c96SJan Schmidt int ret = 0; 4275d7728c96SJan Schmidt int size; 4276d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4277d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4278d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4279d7728c96SJan Schmidt 4280d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4281d7728c96SJan Schmidt return -EPERM; 4282d7728c96SJan Schmidt 4283d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4284d7728c96SJan Schmidt if (IS_ERR(loi)) { 4285d7728c96SJan Schmidt ret = PTR_ERR(loi); 4286d7728c96SJan Schmidt loi = NULL; 4287d7728c96SJan Schmidt goto out; 4288d7728c96SJan Schmidt } 4289d7728c96SJan Schmidt 4290d7728c96SJan Schmidt path = btrfs_alloc_path(); 4291d7728c96SJan Schmidt if (!path) { 4292d7728c96SJan Schmidt ret = -ENOMEM; 4293d7728c96SJan Schmidt goto out; 4294d7728c96SJan Schmidt } 4295d7728c96SJan Schmidt 4296425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 4297d7728c96SJan Schmidt inodes = init_data_container(size); 4298d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4299d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4300d7728c96SJan Schmidt inodes = NULL; 4301d7728c96SJan Schmidt goto out; 4302d7728c96SJan Schmidt } 4303d7728c96SJan Schmidt 4304df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4305df031f07SLiu Bo build_ino_list, inodes); 4306df031f07SLiu Bo if (ret == -EINVAL) 4307d7728c96SJan Schmidt ret = -ENOENT; 4308d7728c96SJan Schmidt if (ret < 0) 4309d7728c96SJan Schmidt goto out; 4310d7728c96SJan Schmidt 4311745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4312745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4313d7728c96SJan Schmidt if (ret) 4314d7728c96SJan Schmidt ret = -EFAULT; 4315d7728c96SJan Schmidt 4316d7728c96SJan Schmidt out: 4317d7728c96SJan Schmidt btrfs_free_path(path); 4318425d17a2SLiu Bo vfree(inodes); 4319d7728c96SJan Schmidt kfree(loi); 4320d7728c96SJan Schmidt 4321d7728c96SJan Schmidt return ret; 4322d7728c96SJan Schmidt } 4323d7728c96SJan Schmidt 432419a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4325c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4326c9e9f97bSIlya Dryomov { 4327c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4328c9e9f97bSIlya Dryomov 4329c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4330c9e9f97bSIlya Dryomov 4331837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4332837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4333837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4334837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4335a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4336a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4337837d5b6eSIlya Dryomov 4338c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4339c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4340c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 434119a39dceSIlya Dryomov 434219a39dceSIlya Dryomov if (lock) { 434319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 434419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 434519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 434619a39dceSIlya Dryomov } else { 434719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 434819a39dceSIlya Dryomov } 4349c9e9f97bSIlya Dryomov } 4350c9e9f97bSIlya Dryomov 43519ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4352c9e9f97bSIlya Dryomov { 4353496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4354c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4355c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4356c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4357ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4358c9e9f97bSIlya Dryomov int ret; 4359c9e9f97bSIlya Dryomov 4360c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4361c9e9f97bSIlya Dryomov return -EPERM; 4362c9e9f97bSIlya Dryomov 4363e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43649ba1f6e4SLiu Bo if (ret) 43659ba1f6e4SLiu Bo return ret; 43669ba1f6e4SLiu Bo 4367ed0fb78fSIlya Dryomov again: 4368ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4369c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4370c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4371ed0fb78fSIlya Dryomov need_unlock = true; 4372ed0fb78fSIlya Dryomov goto locked; 4373ed0fb78fSIlya Dryomov } 4374ed0fb78fSIlya Dryomov 4375ed0fb78fSIlya Dryomov /* 4376ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4377ed0fb78fSIlya Dryomov * (1) some other op is running 4378ed0fb78fSIlya Dryomov * (2) balance is running 4379ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4380ed0fb78fSIlya Dryomov */ 4381ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4382ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4383ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4384ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4385ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4386ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4387ed0fb78fSIlya Dryomov goto again; 4388ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4389ed0fb78fSIlya Dryomov 4390ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4391ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4392ed0fb78fSIlya Dryomov /* this is (3) */ 4393ed0fb78fSIlya Dryomov need_unlock = false; 4394ed0fb78fSIlya Dryomov goto locked; 4395ed0fb78fSIlya Dryomov } 4396ed0fb78fSIlya Dryomov 4397ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4398ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4399ed0fb78fSIlya Dryomov goto again; 4400ed0fb78fSIlya Dryomov } else { 4401ed0fb78fSIlya Dryomov /* this is (2) */ 4402ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4403ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4404ed0fb78fSIlya Dryomov goto out; 4405ed0fb78fSIlya Dryomov } 4406ed0fb78fSIlya Dryomov } else { 4407ed0fb78fSIlya Dryomov /* this is (1) */ 4408ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4409e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4410ed0fb78fSIlya Dryomov goto out; 4411ed0fb78fSIlya Dryomov } 4412ed0fb78fSIlya Dryomov 4413ed0fb78fSIlya Dryomov locked: 4414ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4415c9e9f97bSIlya Dryomov 4416c9e9f97bSIlya Dryomov if (arg) { 4417c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4418c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4419c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4420ed0fb78fSIlya Dryomov goto out_unlock; 4421c9e9f97bSIlya Dryomov } 4422de322263SIlya Dryomov 4423de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4424de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4425de322263SIlya Dryomov ret = -ENOTCONN; 4426de322263SIlya Dryomov goto out_bargs; 4427de322263SIlya Dryomov } 4428de322263SIlya Dryomov 4429de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4430de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4431de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4432de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4433de322263SIlya Dryomov 4434de322263SIlya Dryomov goto do_balance; 4435de322263SIlya Dryomov } 4436c9e9f97bSIlya Dryomov } else { 4437c9e9f97bSIlya Dryomov bargs = NULL; 4438c9e9f97bSIlya Dryomov } 4439c9e9f97bSIlya Dryomov 4440ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4441837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4442837d5b6eSIlya Dryomov goto out_bargs; 4443837d5b6eSIlya Dryomov } 4444837d5b6eSIlya Dryomov 4445c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4446c9e9f97bSIlya Dryomov if (!bctl) { 4447c9e9f97bSIlya Dryomov ret = -ENOMEM; 4448c9e9f97bSIlya Dryomov goto out_bargs; 4449c9e9f97bSIlya Dryomov } 4450c9e9f97bSIlya Dryomov 4451c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4452c9e9f97bSIlya Dryomov if (arg) { 4453c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4454c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4455c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4456c9e9f97bSIlya Dryomov 4457c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4458f43ffb60SIlya Dryomov } else { 4459f43ffb60SIlya Dryomov /* balance everything - no filters */ 4460f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4461c9e9f97bSIlya Dryomov } 4462c9e9f97bSIlya Dryomov 4463de322263SIlya Dryomov do_balance: 4464c9e9f97bSIlya Dryomov /* 4465ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4466ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4467ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4468ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4469ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4470c9e9f97bSIlya Dryomov */ 4471ed0fb78fSIlya Dryomov need_unlock = false; 4472ed0fb78fSIlya Dryomov 4473ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4474ed0fb78fSIlya Dryomov 4475c9e9f97bSIlya Dryomov if (arg) { 4476c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4477c9e9f97bSIlya Dryomov ret = -EFAULT; 4478c9e9f97bSIlya Dryomov } 4479c9e9f97bSIlya Dryomov 4480c9e9f97bSIlya Dryomov out_bargs: 4481c9e9f97bSIlya Dryomov kfree(bargs); 4482ed0fb78fSIlya Dryomov out_unlock: 4483c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4484c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4485ed0fb78fSIlya Dryomov if (need_unlock) 4486ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4487ed0fb78fSIlya Dryomov out: 4488e54bfa31SLiu Bo mnt_drop_write_file(file); 4489c9e9f97bSIlya Dryomov return ret; 4490c9e9f97bSIlya Dryomov } 4491c9e9f97bSIlya Dryomov 4492837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4493837d5b6eSIlya Dryomov { 4494837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4495837d5b6eSIlya Dryomov return -EPERM; 4496837d5b6eSIlya Dryomov 4497837d5b6eSIlya Dryomov switch (cmd) { 4498837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4499837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4500a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4501a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4502837d5b6eSIlya Dryomov } 4503837d5b6eSIlya Dryomov 4504837d5b6eSIlya Dryomov return -EINVAL; 4505837d5b6eSIlya Dryomov } 4506837d5b6eSIlya Dryomov 450719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 450819a39dceSIlya Dryomov void __user *arg) 450919a39dceSIlya Dryomov { 451019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 451119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 451219a39dceSIlya Dryomov int ret = 0; 451319a39dceSIlya Dryomov 451419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 451519a39dceSIlya Dryomov return -EPERM; 451619a39dceSIlya Dryomov 451719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 451819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 451919a39dceSIlya Dryomov ret = -ENOTCONN; 452019a39dceSIlya Dryomov goto out; 452119a39dceSIlya Dryomov } 452219a39dceSIlya Dryomov 452319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 452419a39dceSIlya Dryomov if (!bargs) { 452519a39dceSIlya Dryomov ret = -ENOMEM; 452619a39dceSIlya Dryomov goto out; 452719a39dceSIlya Dryomov } 452819a39dceSIlya Dryomov 452919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 453019a39dceSIlya Dryomov 453119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 453219a39dceSIlya Dryomov ret = -EFAULT; 453319a39dceSIlya Dryomov 453419a39dceSIlya Dryomov kfree(bargs); 453519a39dceSIlya Dryomov out: 453619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 453719a39dceSIlya Dryomov return ret; 453819a39dceSIlya Dryomov } 453919a39dceSIlya Dryomov 4540905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45415d13a37bSArne Jansen { 4542496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45435d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45445d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 45455d13a37bSArne Jansen int ret; 45465d13a37bSArne Jansen int err; 45475d13a37bSArne Jansen 45485d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45495d13a37bSArne Jansen return -EPERM; 45505d13a37bSArne Jansen 4551905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4552905b0ddaSMiao Xie if (ret) 4553905b0ddaSMiao Xie return ret; 45545d13a37bSArne Jansen 45555d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4556905b0ddaSMiao Xie if (IS_ERR(sa)) { 4557905b0ddaSMiao Xie ret = PTR_ERR(sa); 4558905b0ddaSMiao Xie goto drop_write; 4559905b0ddaSMiao Xie } 45605d13a37bSArne Jansen 45617708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 456292f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 45635d13a37bSArne Jansen if (IS_ERR(trans)) { 45645d13a37bSArne Jansen ret = PTR_ERR(trans); 45655d13a37bSArne Jansen goto out; 45665d13a37bSArne Jansen } 45675d13a37bSArne Jansen 45685d13a37bSArne Jansen switch (sa->cmd) { 45695d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 45705d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 45715d13a37bSArne Jansen break; 45725d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 45735d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 45745d13a37bSArne Jansen break; 45755d13a37bSArne Jansen default: 45765d13a37bSArne Jansen ret = -EINVAL; 45775d13a37bSArne Jansen break; 45785d13a37bSArne Jansen } 45795d13a37bSArne Jansen 458092f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 45815d13a37bSArne Jansen if (err && !ret) 45825d13a37bSArne Jansen ret = err; 45835d13a37bSArne Jansen out: 45845d13a37bSArne Jansen kfree(sa); 45857708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4586905b0ddaSMiao Xie drop_write: 4587905b0ddaSMiao Xie mnt_drop_write_file(file); 45885d13a37bSArne Jansen return ret; 45895d13a37bSArne Jansen } 45905d13a37bSArne Jansen 4591905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 45925d13a37bSArne Jansen { 4593496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 45945d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 45955d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45965d13a37bSArne Jansen int ret; 45975d13a37bSArne Jansen int err; 45985d13a37bSArne Jansen 45995d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46005d13a37bSArne Jansen return -EPERM; 46015d13a37bSArne Jansen 4602905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4603905b0ddaSMiao Xie if (ret) 4604905b0ddaSMiao Xie return ret; 46055d13a37bSArne Jansen 46065d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4607905b0ddaSMiao Xie if (IS_ERR(sa)) { 4608905b0ddaSMiao Xie ret = PTR_ERR(sa); 4609905b0ddaSMiao Xie goto drop_write; 4610905b0ddaSMiao Xie } 46115d13a37bSArne Jansen 46125d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46135d13a37bSArne Jansen if (IS_ERR(trans)) { 46145d13a37bSArne Jansen ret = PTR_ERR(trans); 46155d13a37bSArne Jansen goto out; 46165d13a37bSArne Jansen } 46175d13a37bSArne Jansen 46185d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46195d13a37bSArne Jansen if (sa->assign) { 46205d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 46215d13a37bSArne Jansen sa->src, sa->dst); 46225d13a37bSArne Jansen } else { 46235d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 46245d13a37bSArne Jansen sa->src, sa->dst); 46255d13a37bSArne Jansen } 46265d13a37bSArne Jansen 46275d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46285d13a37bSArne Jansen if (err && !ret) 46295d13a37bSArne Jansen ret = err; 46305d13a37bSArne Jansen 46315d13a37bSArne Jansen out: 46325d13a37bSArne Jansen kfree(sa); 4633905b0ddaSMiao Xie drop_write: 4634905b0ddaSMiao Xie mnt_drop_write_file(file); 46355d13a37bSArne Jansen return ret; 46365d13a37bSArne Jansen } 46375d13a37bSArne Jansen 4638905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46395d13a37bSArne Jansen { 4640496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46415d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46425d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46435d13a37bSArne Jansen int ret; 46445d13a37bSArne Jansen int err; 46455d13a37bSArne Jansen 46465d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46475d13a37bSArne Jansen return -EPERM; 46485d13a37bSArne Jansen 4649905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4650905b0ddaSMiao Xie if (ret) 4651905b0ddaSMiao Xie return ret; 46525d13a37bSArne Jansen 46535d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4654905b0ddaSMiao Xie if (IS_ERR(sa)) { 4655905b0ddaSMiao Xie ret = PTR_ERR(sa); 4656905b0ddaSMiao Xie goto drop_write; 4657905b0ddaSMiao Xie } 46585d13a37bSArne Jansen 4659d86e56cfSMiao Xie if (!sa->qgroupid) { 4660d86e56cfSMiao Xie ret = -EINVAL; 4661d86e56cfSMiao Xie goto out; 4662d86e56cfSMiao Xie } 4663d86e56cfSMiao Xie 46645d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46655d13a37bSArne Jansen if (IS_ERR(trans)) { 46665d13a37bSArne Jansen ret = PTR_ERR(trans); 46675d13a37bSArne Jansen goto out; 46685d13a37bSArne Jansen } 46695d13a37bSArne Jansen 46705d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 46715d13a37bSArne Jansen if (sa->create) { 46725d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 46735d13a37bSArne Jansen NULL); 46745d13a37bSArne Jansen } else { 46755d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 46765d13a37bSArne Jansen } 46775d13a37bSArne Jansen 46785d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 46795d13a37bSArne Jansen if (err && !ret) 46805d13a37bSArne Jansen ret = err; 46815d13a37bSArne Jansen 46825d13a37bSArne Jansen out: 46835d13a37bSArne Jansen kfree(sa); 4684905b0ddaSMiao Xie drop_write: 4685905b0ddaSMiao Xie mnt_drop_write_file(file); 46865d13a37bSArne Jansen return ret; 46875d13a37bSArne Jansen } 46885d13a37bSArne Jansen 4689905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 46905d13a37bSArne Jansen { 4691496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 46925d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 46935d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46945d13a37bSArne Jansen int ret; 46955d13a37bSArne Jansen int err; 46965d13a37bSArne Jansen u64 qgroupid; 46975d13a37bSArne Jansen 46985d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46995d13a37bSArne Jansen return -EPERM; 47005d13a37bSArne Jansen 4701905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4702905b0ddaSMiao Xie if (ret) 4703905b0ddaSMiao Xie return ret; 47045d13a37bSArne Jansen 47055d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4706905b0ddaSMiao Xie if (IS_ERR(sa)) { 4707905b0ddaSMiao Xie ret = PTR_ERR(sa); 4708905b0ddaSMiao Xie goto drop_write; 4709905b0ddaSMiao Xie } 47105d13a37bSArne Jansen 47115d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47125d13a37bSArne Jansen if (IS_ERR(trans)) { 47135d13a37bSArne Jansen ret = PTR_ERR(trans); 47145d13a37bSArne Jansen goto out; 47155d13a37bSArne Jansen } 47165d13a37bSArne Jansen 47175d13a37bSArne Jansen qgroupid = sa->qgroupid; 47185d13a37bSArne Jansen if (!qgroupid) { 47195d13a37bSArne Jansen /* take the current subvol as qgroup */ 47205d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47215d13a37bSArne Jansen } 47225d13a37bSArne Jansen 47235d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 47245d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 47255d13a37bSArne Jansen 47265d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 47275d13a37bSArne Jansen if (err && !ret) 47285d13a37bSArne Jansen ret = err; 47295d13a37bSArne Jansen 47305d13a37bSArne Jansen out: 47315d13a37bSArne Jansen kfree(sa); 4732905b0ddaSMiao Xie drop_write: 4733905b0ddaSMiao Xie mnt_drop_write_file(file); 47345d13a37bSArne Jansen return ret; 47355d13a37bSArne Jansen } 47365d13a37bSArne Jansen 47372f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47382f232036SJan Schmidt { 47396d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47402f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47412f232036SJan Schmidt int ret; 47422f232036SJan Schmidt 47432f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47442f232036SJan Schmidt return -EPERM; 47452f232036SJan Schmidt 47462f232036SJan Schmidt ret = mnt_want_write_file(file); 47472f232036SJan Schmidt if (ret) 47482f232036SJan Schmidt return ret; 47492f232036SJan Schmidt 47502f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47512f232036SJan Schmidt if (IS_ERR(qsa)) { 47522f232036SJan Schmidt ret = PTR_ERR(qsa); 47532f232036SJan Schmidt goto drop_write; 47542f232036SJan Schmidt } 47552f232036SJan Schmidt 47562f232036SJan Schmidt if (qsa->flags) { 47572f232036SJan Schmidt ret = -EINVAL; 47582f232036SJan Schmidt goto out; 47592f232036SJan Schmidt } 47602f232036SJan Schmidt 47612f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 47622f232036SJan Schmidt 47632f232036SJan Schmidt out: 47642f232036SJan Schmidt kfree(qsa); 47652f232036SJan Schmidt drop_write: 47662f232036SJan Schmidt mnt_drop_write_file(file); 47672f232036SJan Schmidt return ret; 47682f232036SJan Schmidt } 47692f232036SJan Schmidt 47702f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 47712f232036SJan Schmidt { 47726d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47732f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47742f232036SJan Schmidt int ret = 0; 47752f232036SJan Schmidt 47762f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47772f232036SJan Schmidt return -EPERM; 47782f232036SJan Schmidt 47792f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 47802f232036SJan Schmidt if (!qsa) 47812f232036SJan Schmidt return -ENOMEM; 47822f232036SJan Schmidt 47832f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47842f232036SJan Schmidt qsa->flags = 1; 47852f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 47862f232036SJan Schmidt } 47872f232036SJan Schmidt 47882f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 47892f232036SJan Schmidt ret = -EFAULT; 47902f232036SJan Schmidt 47912f232036SJan Schmidt kfree(qsa); 47922f232036SJan Schmidt return ret; 47932f232036SJan Schmidt } 47942f232036SJan Schmidt 479557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 479657254b6eSJan Schmidt { 479754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 479857254b6eSJan Schmidt 479957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 480057254b6eSJan Schmidt return -EPERM; 480157254b6eSJan Schmidt 480257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 480357254b6eSJan Schmidt } 480457254b6eSJan Schmidt 4805abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4806abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48078ea05e3aSAlexander Block { 4808496ad9aaSAl Viro struct inode *inode = file_inode(file); 48098ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48108ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48118ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 48128ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 48138ea05e3aSAlexander Block int ret = 0; 4814dd5f9615SStefan Behrens int received_uuid_changed; 48158ea05e3aSAlexander Block 4816bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4817bd60ea0fSDavid Sterba return -EPERM; 4818bd60ea0fSDavid Sterba 48198ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48208ea05e3aSAlexander Block if (ret < 0) 48218ea05e3aSAlexander Block return ret; 48228ea05e3aSAlexander Block 48238ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 48248ea05e3aSAlexander Block 48258ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 48268ea05e3aSAlexander Block ret = -EINVAL; 48278ea05e3aSAlexander Block goto out; 48288ea05e3aSAlexander Block } 48298ea05e3aSAlexander Block 48308ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48318ea05e3aSAlexander Block ret = -EROFS; 48328ea05e3aSAlexander Block goto out; 48338ea05e3aSAlexander Block } 48348ea05e3aSAlexander Block 4835dd5f9615SStefan Behrens /* 4836dd5f9615SStefan Behrens * 1 - root item 4837dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4838dd5f9615SStefan Behrens */ 4839dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48408ea05e3aSAlexander Block if (IS_ERR(trans)) { 48418ea05e3aSAlexander Block ret = PTR_ERR(trans); 48428ea05e3aSAlexander Block trans = NULL; 48438ea05e3aSAlexander Block goto out; 48448ea05e3aSAlexander Block } 48458ea05e3aSAlexander Block 48468ea05e3aSAlexander Block sa->rtransid = trans->transid; 48478ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48488ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48498ea05e3aSAlexander Block 4850dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4851dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4852dd5f9615SStefan Behrens if (received_uuid_changed && 4853dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4854dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4855dd5f9615SStefan Behrens root_item->received_uuid, 4856dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4857dd5f9615SStefan Behrens root->root_key.objectid); 48588ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48598ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48608ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48613cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48623cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48633cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48643cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48658ea05e3aSAlexander Block 48668ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 48678ea05e3aSAlexander Block &root->root_key, &root->root_item); 48688ea05e3aSAlexander Block if (ret < 0) { 48698ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 48708ea05e3aSAlexander Block goto out; 4871dd5f9615SStefan Behrens } 4872dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4873dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4874dd5f9615SStefan Behrens sa->uuid, 4875dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4876dd5f9615SStefan Behrens root->root_key.objectid); 4877dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4878dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4879dd5f9615SStefan Behrens goto out; 4880dd5f9615SStefan Behrens } 4881dd5f9615SStefan Behrens } 48828ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4883dd5f9615SStefan Behrens if (ret < 0) { 4884dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 48858ea05e3aSAlexander Block goto out; 48868ea05e3aSAlexander Block } 48878ea05e3aSAlexander Block 4888abccd00fSHugo Mills out: 4889abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4890abccd00fSHugo Mills mnt_drop_write_file(file); 4891abccd00fSHugo Mills return ret; 4892abccd00fSHugo Mills } 4893abccd00fSHugo Mills 4894abccd00fSHugo Mills #ifdef CONFIG_64BIT 4895abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4896abccd00fSHugo Mills void __user *arg) 4897abccd00fSHugo Mills { 4898abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4899abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4900abccd00fSHugo Mills int ret = 0; 4901abccd00fSHugo Mills 4902abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4903abccd00fSHugo Mills if (IS_ERR(args32)) { 4904abccd00fSHugo Mills ret = PTR_ERR(args32); 4905abccd00fSHugo Mills args32 = NULL; 4906abccd00fSHugo Mills goto out; 4907abccd00fSHugo Mills } 4908abccd00fSHugo Mills 4909abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 491084dbeb87SDan Carpenter if (!args64) { 491184dbeb87SDan Carpenter ret = -ENOMEM; 4912abccd00fSHugo Mills goto out; 4913abccd00fSHugo Mills } 4914abccd00fSHugo Mills 4915abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4916abccd00fSHugo Mills args64->stransid = args32->stransid; 4917abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4918abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4919abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4920abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4921abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4922abccd00fSHugo Mills args64->flags = args32->flags; 4923abccd00fSHugo Mills 4924abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4925abccd00fSHugo Mills if (ret) 4926abccd00fSHugo Mills goto out; 4927abccd00fSHugo Mills 4928abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4929abccd00fSHugo Mills args32->stransid = args64->stransid; 4930abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4931abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4932abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4933abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4934abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4935abccd00fSHugo Mills args32->flags = args64->flags; 4936abccd00fSHugo Mills 4937abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4938abccd00fSHugo Mills if (ret) 4939abccd00fSHugo Mills ret = -EFAULT; 4940abccd00fSHugo Mills 4941abccd00fSHugo Mills out: 4942abccd00fSHugo Mills kfree(args32); 4943abccd00fSHugo Mills kfree(args64); 4944abccd00fSHugo Mills return ret; 4945abccd00fSHugo Mills } 4946abccd00fSHugo Mills #endif 4947abccd00fSHugo Mills 4948abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4949abccd00fSHugo Mills void __user *arg) 4950abccd00fSHugo Mills { 4951abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4952abccd00fSHugo Mills int ret = 0; 4953abccd00fSHugo Mills 4954abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4955abccd00fSHugo Mills if (IS_ERR(sa)) { 4956abccd00fSHugo Mills ret = PTR_ERR(sa); 4957abccd00fSHugo Mills sa = NULL; 4958abccd00fSHugo Mills goto out; 4959abccd00fSHugo Mills } 4960abccd00fSHugo Mills 4961abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4962abccd00fSHugo Mills 4963abccd00fSHugo Mills if (ret) 4964abccd00fSHugo Mills goto out; 4965abccd00fSHugo Mills 49668ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49678ea05e3aSAlexander Block if (ret) 49688ea05e3aSAlexander Block ret = -EFAULT; 49698ea05e3aSAlexander Block 49708ea05e3aSAlexander Block out: 49718ea05e3aSAlexander Block kfree(sa); 49728ea05e3aSAlexander Block return ret; 49738ea05e3aSAlexander Block } 49748ea05e3aSAlexander Block 4975867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4976867ab667Sjeff.liu { 49776d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4978a1b83ac5SAnand Jain size_t len; 4979867ab667Sjeff.liu int ret; 4980a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4981a1b83ac5SAnand Jain 4982a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4983a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4984a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4985a1b83ac5SAnand Jain 4986a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4987867ab667Sjeff.liu 4988867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4989efe120a0SFrank Holton btrfs_warn(root->fs_info, 4990efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 4991867ab667Sjeff.liu } 4992867ab667Sjeff.liu 4993867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4994867ab667Sjeff.liu 4995867ab667Sjeff.liu return ret ? -EFAULT : 0; 4996867ab667Sjeff.liu } 4997867ab667Sjeff.liu 4998a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4999a8bfd4abSjeff.liu { 50006d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5001a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5002a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5003a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5004a8bfd4abSjeff.liu int ret; 5005a8bfd4abSjeff.liu 5006a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5007a8bfd4abSjeff.liu return -EPERM; 5008a8bfd4abSjeff.liu 5009a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5010a8bfd4abSjeff.liu return -EFAULT; 5011a8bfd4abSjeff.liu 5012a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5013efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5014a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5015a8bfd4abSjeff.liu return -EINVAL; 5016a8bfd4abSjeff.liu } 5017a8bfd4abSjeff.liu 5018a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5019a8bfd4abSjeff.liu if (ret) 5020a8bfd4abSjeff.liu return ret; 5021a8bfd4abSjeff.liu 5022a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5023a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5024a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5025a8bfd4abSjeff.liu goto out_unlock; 5026a8bfd4abSjeff.liu } 5027a8bfd4abSjeff.liu 5028a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5029a8bfd4abSjeff.liu strcpy(super_block->label, label); 5030a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5031d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5032a8bfd4abSjeff.liu 5033a8bfd4abSjeff.liu out_unlock: 5034a8bfd4abSjeff.liu mnt_drop_write_file(file); 5035a8bfd4abSjeff.liu return ret; 5036a8bfd4abSjeff.liu } 5037a8bfd4abSjeff.liu 50382eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50392eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50402eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50412eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50422eaa055fSJeff Mahoney 50432eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 50442eaa055fSJeff Mahoney void __user *arg) 50452eaa055fSJeff Mahoney { 50462eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 50472eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50482eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50492eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50502eaa055fSJeff Mahoney }; 50512eaa055fSJeff Mahoney 50522eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50532eaa055fSJeff Mahoney return -EFAULT; 50542eaa055fSJeff Mahoney 50552eaa055fSJeff Mahoney return 0; 50562eaa055fSJeff Mahoney } 50572eaa055fSJeff Mahoney 50582eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 50592eaa055fSJeff Mahoney { 50602eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 50612eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 50622eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50632eaa055fSJeff Mahoney 50642eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50652eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50662eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50672eaa055fSJeff Mahoney 50682eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50692eaa055fSJeff Mahoney return -EFAULT; 50702eaa055fSJeff Mahoney 50712eaa055fSJeff Mahoney return 0; 50722eaa055fSJeff Mahoney } 50732eaa055fSJeff Mahoney 50743b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 50753b02a68aSJeff Mahoney enum btrfs_feature_set set, 50762eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50772eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50782eaa055fSJeff Mahoney { 50793b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 50803b02a68aSJeff Mahoney char *names; 50812eaa055fSJeff Mahoney u64 disallowed, unsupported; 50822eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50832eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50842eaa055fSJeff Mahoney 50852eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50862eaa055fSJeff Mahoney if (unsupported) { 50873b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50883b02a68aSJeff Mahoney if (names) { 50893b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 50903b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 50913b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50923b02a68aSJeff Mahoney kfree(names); 50933b02a68aSJeff Mahoney } else 50942eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 50952eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 50962eaa055fSJeff Mahoney type, unsupported); 50972eaa055fSJeff Mahoney return -EOPNOTSUPP; 50982eaa055fSJeff Mahoney } 50992eaa055fSJeff Mahoney 51002eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51012eaa055fSJeff Mahoney if (disallowed) { 51023b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51033b02a68aSJeff Mahoney if (names) { 51043b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51053b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51063b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51073b02a68aSJeff Mahoney kfree(names); 51083b02a68aSJeff Mahoney } else 51092eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51102eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51112eaa055fSJeff Mahoney type, disallowed); 51122eaa055fSJeff Mahoney return -EPERM; 51132eaa055fSJeff Mahoney } 51142eaa055fSJeff Mahoney 51152eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51162eaa055fSJeff Mahoney if (disallowed) { 51173b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51183b02a68aSJeff Mahoney if (names) { 51193b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 51203b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51213b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51223b02a68aSJeff Mahoney kfree(names); 51233b02a68aSJeff Mahoney } else 51242eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 51252eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51262eaa055fSJeff Mahoney type, disallowed); 51272eaa055fSJeff Mahoney return -EPERM; 51282eaa055fSJeff Mahoney } 51292eaa055fSJeff Mahoney 51302eaa055fSJeff Mahoney return 0; 51312eaa055fSJeff Mahoney } 51322eaa055fSJeff Mahoney 51332eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 51343b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 51352eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51362eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51372eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51382eaa055fSJeff Mahoney 51392eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51402eaa055fSJeff Mahoney { 51412eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 51422eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 51432eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51442eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51452eaa055fSJeff Mahoney u64 newflags; 51462eaa055fSJeff Mahoney int ret; 51472eaa055fSJeff Mahoney 51482eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51492eaa055fSJeff Mahoney return -EPERM; 51502eaa055fSJeff Mahoney 51512eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51522eaa055fSJeff Mahoney return -EFAULT; 51532eaa055fSJeff Mahoney 51542eaa055fSJeff Mahoney /* Nothing to do */ 51552eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51562eaa055fSJeff Mahoney !flags[0].incompat_flags) 51572eaa055fSJeff Mahoney return 0; 51582eaa055fSJeff Mahoney 51592eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 51602eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51612eaa055fSJeff Mahoney if (ret) 51622eaa055fSJeff Mahoney return ret; 51632eaa055fSJeff Mahoney 51642eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 51652eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51662eaa055fSJeff Mahoney if (ret) 51672eaa055fSJeff Mahoney return ret; 51682eaa055fSJeff Mahoney 51692eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 51702eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51712eaa055fSJeff Mahoney if (ret) 51722eaa055fSJeff Mahoney return ret; 51732eaa055fSJeff Mahoney 51748051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51752eaa055fSJeff Mahoney if (IS_ERR(trans)) 51762eaa055fSJeff Mahoney return PTR_ERR(trans); 51772eaa055fSJeff Mahoney 51782eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 51792eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51802eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51812eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51822eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51832eaa055fSJeff Mahoney 51842eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51852eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51862eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51872eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51882eaa055fSJeff Mahoney 51892eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 51902eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 51912eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 51922eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 51932eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 51942eaa055fSJeff Mahoney 5195d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 51962eaa055fSJeff Mahoney } 51972eaa055fSJeff Mahoney 5198f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5199f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5200f46b5a66SChristoph Hellwig { 5201496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52024bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5203f46b5a66SChristoph Hellwig 5204f46b5a66SChristoph Hellwig switch (cmd) { 52056cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 52066cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 52076cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 52086cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 52096cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 52106cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5211f7039b1dSLi Dongyang case FITRIM: 5212f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5213f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5214fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5215fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5216fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 52173de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5218fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 52196f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 52206f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 522176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 522276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 52230caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 52240caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 52250caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 52260caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 52276ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 52286ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5229f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 52301e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 52311e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 52321e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5233f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5234198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5235f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 52364bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5237f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5238da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5239475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5240475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5241475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5242475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5243f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 52449ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5245f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 5246c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 5247c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 52487a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 5249f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5250f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5251f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5252f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5253ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5254ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5255cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5256cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5257ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5258ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5259d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5260d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5261d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5262d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 52631406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 52641406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 52659b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 52669b199859SFilipe David Borba Manana int ret; 52679b199859SFilipe David Borba Manana 52686c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 52699b199859SFilipe David Borba Manana if (ret) 52709b199859SFilipe David Borba Manana return ret; 5271ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 52722fad4e83SDavid Sterba /* 52732fad4e83SDavid Sterba * The transaction thread may want to do more work, 52742fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 52752fad4e83SDavid Sterba * processing uncleaned subvols. 52762fad4e83SDavid Sterba */ 52772fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 52789b199859SFilipe David Borba Manana return ret; 52799b199859SFilipe David Borba Manana } 528046204592SSage Weil case BTRFS_IOC_START_SYNC: 52819a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 528246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 52839a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5284475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5285b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5286475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5287475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5288475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5289475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5290c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 52919ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5292837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5293837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 529419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 529519a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 52968ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 52978ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5298abccd00fSHugo Mills #ifdef CONFIG_64BIT 5299abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5300abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5301abccd00fSHugo Mills #endif 530231db9f7cSAlexander Block case BTRFS_IOC_SEND: 530331db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5304c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5305b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 53065d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5307905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 53085d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5309905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 53105d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5311905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 53125d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5313905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 53142f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 53152f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 53162f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 53172f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 531857254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 531957254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 53203f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 53213f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5322867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5323867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5324a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5325a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 5326416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 5327416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 53282eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 53292eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 53302eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 53312eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 53322eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 53332eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5334f46b5a66SChristoph Hellwig } 5335f46b5a66SChristoph Hellwig 5336f46b5a66SChristoph Hellwig return -ENOTTY; 5337f46b5a66SChristoph Hellwig } 5338