1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 5963541927SFilipe David Borba Manana #include "props.h" 603b02a68aSJeff Mahoney #include "sysfs.h" 61f46b5a66SChristoph Hellwig 62abccd00fSHugo Mills #ifdef CONFIG_64BIT 63abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 64abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 65abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 66abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 67abccd00fSHugo Mills */ 68abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 69abccd00fSHugo Mills __u64 sec; 70abccd00fSHugo Mills __u32 nsec; 71abccd00fSHugo Mills } __attribute__ ((__packed__)); 72abccd00fSHugo Mills 73abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 74abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 75abccd00fSHugo Mills __u64 stransid; /* in */ 76abccd00fSHugo Mills __u64 rtransid; /* out */ 77abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 78abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 79abccd00fSHugo Mills __u64 flags; /* in */ 80abccd00fSHugo Mills __u64 reserved[16]; /* in */ 81abccd00fSHugo Mills } __attribute__ ((__packed__)); 82abccd00fSHugo Mills 83abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 84abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 85abccd00fSHugo Mills #endif 86abccd00fSHugo Mills 87abccd00fSHugo Mills 88416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 89416161dbSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff); 90416161dbSMark Fasheh 916cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 926cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 936cbff00fSChristoph Hellwig { 946cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 956cbff00fSChristoph Hellwig return flags; 966cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 1036cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1046cbff00fSChristoph Hellwig */ 1056cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1066cbff00fSChristoph Hellwig { 1076cbff00fSChristoph Hellwig unsigned int iflags = 0; 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1116cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1136cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1166cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1186cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1206cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 121d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 122d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 123d0092bddSLi Zefan 124d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 125d0092bddSLi Zefan iflags |= FS_COMPR_FL; 126d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 127d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1286cbff00fSChristoph Hellwig 1296cbff00fSChristoph Hellwig return iflags; 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig /* 1336cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1346cbff00fSChristoph Hellwig */ 1356cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1366cbff00fSChristoph Hellwig { 1376cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1386cbff00fSChristoph Hellwig 1396cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1426cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1436cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1446cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1456cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1466cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1476cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1486cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1496cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1506cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1516cbff00fSChristoph Hellwig } 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig /* 1546cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1556cbff00fSChristoph Hellwig * 156e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1576cbff00fSChristoph Hellwig */ 1586cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1596cbff00fSChristoph Hellwig { 1600b4dcea5SChris Mason unsigned int flags; 1610b4dcea5SChris Mason 1620b4dcea5SChris Mason if (!dir) 1630b4dcea5SChris Mason return; 1640b4dcea5SChris Mason 1650b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1666cbff00fSChristoph Hellwig 167e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 168e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 169e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 170e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 171e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 172e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 173e27425d6SJosef Bacik } 1746cbff00fSChristoph Hellwig 175213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 176e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 177213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 178213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 179213490b3SLiu Bo } 180e27425d6SJosef Bacik 1816cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1826cbff00fSChristoph Hellwig } 1836cbff00fSChristoph Hellwig 1846cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1856cbff00fSChristoph Hellwig { 186496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1876cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1886cbff00fSChristoph Hellwig 1896cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1906cbff00fSChristoph Hellwig return -EFAULT; 1916cbff00fSChristoph Hellwig return 0; 1926cbff00fSChristoph Hellwig } 1936cbff00fSChristoph Hellwig 19475e7cb7fSLiu Bo static int check_flags(unsigned int flags) 19575e7cb7fSLiu Bo { 19675e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19775e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19875e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 199e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 200e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20175e7cb7fSLiu Bo return -EOPNOTSUPP; 20275e7cb7fSLiu Bo 20375e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20475e7cb7fSLiu Bo return -EINVAL; 20575e7cb7fSLiu Bo 20675e7cb7fSLiu Bo return 0; 20775e7cb7fSLiu Bo } 20875e7cb7fSLiu Bo 2096cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2106cbff00fSChristoph Hellwig { 211496ad9aaSAl Viro struct inode *inode = file_inode(file); 2126cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2136cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2146cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2156cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2166cbff00fSChristoph Hellwig int ret; 217f062abf0SLi Zefan u64 ip_oldflags; 218f062abf0SLi Zefan unsigned int i_oldflags; 2197e97b8daSDavid Sterba umode_t mode; 2206cbff00fSChristoph Hellwig 221bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 222bd60ea0fSDavid Sterba return -EPERM; 223bd60ea0fSDavid Sterba 224b83cc969SLi Zefan if (btrfs_root_readonly(root)) 225b83cc969SLi Zefan return -EROFS; 226b83cc969SLi Zefan 2276cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2286cbff00fSChristoph Hellwig return -EFAULT; 2296cbff00fSChristoph Hellwig 23075e7cb7fSLiu Bo ret = check_flags(flags); 23175e7cb7fSLiu Bo if (ret) 23275e7cb7fSLiu Bo return ret; 2336cbff00fSChristoph Hellwig 234e7848683SJan Kara ret = mnt_want_write_file(file); 235e7848683SJan Kara if (ret) 236e7848683SJan Kara return ret; 237e7848683SJan Kara 2386cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2396cbff00fSChristoph Hellwig 240f062abf0SLi Zefan ip_oldflags = ip->flags; 241f062abf0SLi Zefan i_oldflags = inode->i_flags; 2427e97b8daSDavid Sterba mode = inode->i_mode; 243f062abf0SLi Zefan 2446cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2456cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2466cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2476cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2486cbff00fSChristoph Hellwig ret = -EPERM; 2496cbff00fSChristoph Hellwig goto out_unlock; 2506cbff00fSChristoph Hellwig } 2516cbff00fSChristoph Hellwig } 2526cbff00fSChristoph Hellwig 2536cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2546cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2556cbff00fSChristoph Hellwig else 2566cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2576cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2586cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2596cbff00fSChristoph Hellwig else 2606cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2616cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2626cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2636cbff00fSChristoph Hellwig else 2646cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2656cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2666cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2676cbff00fSChristoph Hellwig else 2686cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2696cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2706cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2716cbff00fSChristoph Hellwig else 2726cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2736cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2746cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2756cbff00fSChristoph Hellwig else 2766cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2777e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2787e97b8daSDavid Sterba if (S_ISREG(mode)) { 2797e97b8daSDavid Sterba /* 2807e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2817e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2827e97b8daSDavid Sterba * status of the file and will not set it. 2837e97b8daSDavid Sterba */ 2847e97b8daSDavid Sterba if (inode->i_size == 0) 2857e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2867e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2877e97b8daSDavid Sterba } else { 288e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2897e97b8daSDavid Sterba } 2907e97b8daSDavid Sterba } else { 2917e97b8daSDavid Sterba /* 2927e97b8daSDavid Sterba * Revert back under same assuptions as above 2937e97b8daSDavid Sterba */ 2947e97b8daSDavid Sterba if (S_ISREG(mode)) { 2957e97b8daSDavid Sterba if (inode->i_size == 0) 2967e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2977e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2987e97b8daSDavid Sterba } else { 299e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3007e97b8daSDavid Sterba } 3017e97b8daSDavid Sterba } 3026cbff00fSChristoph Hellwig 30375e7cb7fSLiu Bo /* 30475e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30575e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30675e7cb7fSLiu Bo * things smaller. 30775e7cb7fSLiu Bo */ 30875e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 30975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31075e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31163541927SFilipe David Borba Manana 31263541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31363541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 31463541927SFilipe David Borba Manana goto out_drop; 31575e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 31663541927SFilipe David Borba Manana const char *comp; 31763541927SFilipe David Borba Manana 31875e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 31975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32063541927SFilipe David Borba Manana 32163541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32263541927SFilipe David Borba Manana comp = "lzo"; 32363541927SFilipe David Borba Manana else 32463541927SFilipe David Borba Manana comp = "zlib"; 32563541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 32663541927SFilipe David Borba Manana comp, strlen(comp), 0); 32763541927SFilipe David Borba Manana if (ret) 32863541927SFilipe David Borba Manana goto out_drop; 32963541927SFilipe David Borba Manana 330ebcb904dSLi Zefan } else { 331ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 33275e7cb7fSLiu Bo } 3336cbff00fSChristoph Hellwig 3344da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 335f062abf0SLi Zefan if (IS_ERR(trans)) { 336f062abf0SLi Zefan ret = PTR_ERR(trans); 337f062abf0SLi Zefan goto out_drop; 338f062abf0SLi Zefan } 3396cbff00fSChristoph Hellwig 340306424ccSLi Zefan btrfs_update_iflags(inode); 3410c4d2d95SJosef Bacik inode_inc_iversion(inode); 342306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 3436cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3446cbff00fSChristoph Hellwig 3456cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 346f062abf0SLi Zefan out_drop: 347f062abf0SLi Zefan if (ret) { 348f062abf0SLi Zefan ip->flags = ip_oldflags; 349f062abf0SLi Zefan inode->i_flags = i_oldflags; 350f062abf0SLi Zefan } 3516cbff00fSChristoph Hellwig 3526cbff00fSChristoph Hellwig out_unlock: 3536cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 354e7848683SJan Kara mnt_drop_write_file(file); 3552d4e6f6aSliubo return ret; 3566cbff00fSChristoph Hellwig } 3576cbff00fSChristoph Hellwig 3586cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3596cbff00fSChristoph Hellwig { 360496ad9aaSAl Viro struct inode *inode = file_inode(file); 3616cbff00fSChristoph Hellwig 3626cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3636cbff00fSChristoph Hellwig } 364f46b5a66SChristoph Hellwig 365f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 366f7039b1dSLi Dongyang { 36754563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 368f7039b1dSLi Dongyang struct btrfs_device *device; 369f7039b1dSLi Dongyang struct request_queue *q; 370f7039b1dSLi Dongyang struct fstrim_range range; 371f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 372f7039b1dSLi Dongyang u64 num_devices = 0; 373815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 374f7039b1dSLi Dongyang int ret; 375f7039b1dSLi Dongyang 376f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 377f7039b1dSLi Dongyang return -EPERM; 378f7039b1dSLi Dongyang 3791f78160cSXiao Guangrong rcu_read_lock(); 3801f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3811f78160cSXiao Guangrong dev_list) { 382f7039b1dSLi Dongyang if (!device->bdev) 383f7039b1dSLi Dongyang continue; 384f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 385f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 386f7039b1dSLi Dongyang num_devices++; 387f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 388f7039b1dSLi Dongyang minlen); 389f7039b1dSLi Dongyang } 390f7039b1dSLi Dongyang } 3911f78160cSXiao Guangrong rcu_read_unlock(); 392f4c697e6SLukas Czerner 393f7039b1dSLi Dongyang if (!num_devices) 394f7039b1dSLi Dongyang return -EOPNOTSUPP; 395f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 396f7039b1dSLi Dongyang return -EFAULT; 397e515c18bSLukas Czerner if (range.start > total_bytes || 398e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 399f4c697e6SLukas Czerner return -EINVAL; 400f7039b1dSLi Dongyang 401f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 402f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 403815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 404f7039b1dSLi Dongyang if (ret < 0) 405f7039b1dSLi Dongyang return ret; 406f7039b1dSLi Dongyang 407f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 408f7039b1dSLi Dongyang return -EFAULT; 409f7039b1dSLi Dongyang 410f7039b1dSLi Dongyang return 0; 411f7039b1dSLi Dongyang } 412f7039b1dSLi Dongyang 413dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 414dd5f9615SStefan Behrens { 41546e0f66aSChris Mason int i; 41646e0f66aSChris Mason 41746e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 41846e0f66aSChris Mason if (uuid[i]) 41946e0f66aSChris Mason return 0; 42046e0f66aSChris Mason } 42146e0f66aSChris Mason return 1; 422dd5f9615SStefan Behrens } 423dd5f9615SStefan Behrens 424d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 425cb8e7090SChristoph Hellwig struct dentry *dentry, 42672fd032eSSage Weil char *name, int namelen, 4276f72c7e2SArne Jansen u64 *async_transid, 4288696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 429f46b5a66SChristoph Hellwig { 430f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 431f46b5a66SChristoph Hellwig struct btrfs_key key; 432f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 433f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 434f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 435d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 43676dda93cSYan, Zheng struct btrfs_root *new_root; 437d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 4388ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 4395662344bSTsutomu Itoh struct inode *inode; 440f46b5a66SChristoph Hellwig int ret; 441f46b5a66SChristoph Hellwig int err; 442f46b5a66SChristoph Hellwig u64 objectid; 443f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4443de4586cSChris Mason u64 index = 0; 445d5c12070SMiao Xie u64 qgroup_reserved; 4468ea05e3aSAlexander Block uuid_le new_uuid; 447f46b5a66SChristoph Hellwig 448581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4492fbe8c8aSAl Viro if (ret) 450a22285a6SYan, Zheng return ret; 4516a912213SJosef Bacik 452d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4539ed74f2dSJosef Bacik /* 454d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 455d5c12070SMiao Xie * of create_snapshot(). 4569ed74f2dSJosef Bacik */ 457d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 458dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 459d5c12070SMiao Xie if (ret) 460d5c12070SMiao Xie return ret; 461f46b5a66SChristoph Hellwig 462d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 463d5c12070SMiao Xie if (IS_ERR(trans)) { 464d5c12070SMiao Xie ret = PTR_ERR(trans); 465de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 466de6e8200SLiu Bo qgroup_reserved); 467de6e8200SLiu Bo return ret; 468d5c12070SMiao Xie } 469d5c12070SMiao Xie trans->block_rsv = &block_rsv; 470d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 471f46b5a66SChristoph Hellwig 4728696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4736f72c7e2SArne Jansen if (ret) 4746f72c7e2SArne Jansen goto fail; 4756f72c7e2SArne Jansen 4765d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4775581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4788e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4798e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4808e8a1e31SJosef Bacik goto fail; 4818e8a1e31SJosef Bacik } 482f46b5a66SChristoph Hellwig 4835d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 484f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 485f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4865d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 487f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 488f46b5a66SChristoph Hellwig 4890a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 490f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4915d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 492b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 4935d4f98a2SYan Zheng BTRFS_UUID_SIZE); 494f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 495f46b5a66SChristoph Hellwig 4968ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4978ea05e3aSAlexander Block 498f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 4993cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5003cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5013cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 5023cae210fSQu Wenruo btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); 5033cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 504f46b5a66SChristoph Hellwig 5053cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5063cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5073cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 50808fe4db1SLi Zefan 509f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 51084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 511f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 512f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 51386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 51480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 515f46b5a66SChristoph Hellwig 5168ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5178ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5188ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5198ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5203cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5213cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5228ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5238ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5248ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 525f46b5a66SChristoph Hellwig 526925baeddSChris Mason btrfs_tree_unlock(leaf); 527f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 528f46b5a66SChristoph Hellwig leaf = NULL; 529f46b5a66SChristoph Hellwig 530f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig key.objectid = objectid; 5335d4f98a2SYan Zheng key.offset = 0; 534f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 535f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 536f46b5a66SChristoph Hellwig &root_item); 537f46b5a66SChristoph Hellwig if (ret) 538f46b5a66SChristoph Hellwig goto fail; 539f46b5a66SChristoph Hellwig 54076dda93cSYan, Zheng key.offset = (u64)-1; 54176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 54279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 54379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 54479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 54579787eaaSJeff Mahoney goto fail; 54679787eaaSJeff Mahoney } 54776dda93cSYan, Zheng 54876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 54976dda93cSYan, Zheng 55063541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 551ce598979SMark Fasheh if (ret) { 552ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 55379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 554ce598979SMark Fasheh goto fail; 555ce598979SMark Fasheh } 556ce598979SMark Fasheh 557f46b5a66SChristoph Hellwig /* 558f46b5a66SChristoph Hellwig * insert the directory item 559f46b5a66SChristoph Hellwig */ 5603de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 56179787eaaSJeff Mahoney if (ret) { 56279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 56379787eaaSJeff Mahoney goto fail; 56479787eaaSJeff Mahoney } 5653de4586cSChris Mason 5663de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 56716cdcec7SMiao Xie name, namelen, dir, &key, 5683de4586cSChris Mason BTRFS_FT_DIR, index); 56979787eaaSJeff Mahoney if (ret) { 57079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 571f46b5a66SChristoph Hellwig goto fail; 57279787eaaSJeff Mahoney } 5730660b5afSChris Mason 57452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 57552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 57652c26179SYan Zheng BUG_ON(ret); 57752c26179SYan Zheng 5780660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5794df27c4dSYan, Zheng objectid, root->root_key.objectid, 58033345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 5810660b5afSChris Mason BUG_ON(ret); 5820660b5afSChris Mason 583dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 584dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 585dd5f9615SStefan Behrens objectid); 586dd5f9615SStefan Behrens if (ret) 587dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 588dd5f9615SStefan Behrens 589f46b5a66SChristoph Hellwig fail: 590d5c12070SMiao Xie trans->block_rsv = NULL; 591d5c12070SMiao Xie trans->bytes_reserved = 0; 592de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 593de6e8200SLiu Bo 59472fd032eSSage Weil if (async_transid) { 59572fd032eSSage Weil *async_transid = trans->transid; 59672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 59700d71c9cSMiao Xie if (err) 59800d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 59972fd032eSSage Weil } else { 60076dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 60172fd032eSSage Weil } 602f46b5a66SChristoph Hellwig if (err && !ret) 603f46b5a66SChristoph Hellwig ret = err; 6041a65e24bSChris Mason 6055662344bSTsutomu Itoh if (!ret) { 6065662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 607de6e8200SLiu Bo if (IS_ERR(inode)) 608de6e8200SLiu Bo return PTR_ERR(inode); 6095662344bSTsutomu Itoh d_instantiate(dentry, inode); 6105662344bSTsutomu Itoh } 611f46b5a66SChristoph Hellwig return ret; 612f46b5a66SChristoph Hellwig } 613f46b5a66SChristoph Hellwig 6148257b2dcSMiao Xie static void btrfs_wait_nocow_write(struct btrfs_root *root) 6158257b2dcSMiao Xie { 6168257b2dcSMiao Xie s64 writers; 6178257b2dcSMiao Xie DEFINE_WAIT(wait); 6188257b2dcSMiao Xie 6198257b2dcSMiao Xie do { 6208257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6218257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6228257b2dcSMiao Xie 6238257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6248257b2dcSMiao Xie if (writers) 6258257b2dcSMiao Xie schedule(); 6268257b2dcSMiao Xie 6278257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6288257b2dcSMiao Xie } while (writers); 6298257b2dcSMiao Xie } 6308257b2dcSMiao Xie 631e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 632e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 633e9662f70SMiao Xie u64 *async_transid, bool readonly, 634e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 635f46b5a66SChristoph Hellwig { 6362e4bfab9SYan, Zheng struct inode *inode; 637f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 638f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6392e4bfab9SYan, Zheng int ret; 640f46b5a66SChristoph Hellwig 641f46b5a66SChristoph Hellwig if (!root->ref_cows) 642f46b5a66SChristoph Hellwig return -EINVAL; 643f46b5a66SChristoph Hellwig 6448257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6458257b2dcSMiao Xie smp_mb__after_atomic_inc(); 6468257b2dcSMiao Xie btrfs_wait_nocow_write(root); 6478257b2dcSMiao Xie 6486a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6496a03843dSMiao Xie if (ret) 6508257b2dcSMiao Xie goto out; 6516a03843dSMiao Xie 652b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6536a03843dSMiao Xie 654a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 6558257b2dcSMiao Xie if (!pending_snapshot) { 6568257b2dcSMiao Xie ret = -ENOMEM; 6578257b2dcSMiao Xie goto out; 6588257b2dcSMiao Xie } 659a22285a6SYan, Zheng 66066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 66166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 662d5c12070SMiao Xie /* 663d5c12070SMiao Xie * 1 - parent dir inode 664d5c12070SMiao Xie * 2 - dir entries 665d5c12070SMiao Xie * 1 - root item 666d5c12070SMiao Xie * 2 - root ref/backref 667d5c12070SMiao Xie * 1 - root of snapshot 668dd5f9615SStefan Behrens * 1 - UUID item 669d5c12070SMiao Xie */ 670d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 671dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 672ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 673ee3441b4SJeff Mahoney false); 674d5c12070SMiao Xie if (ret) 6758257b2dcSMiao Xie goto free; 676d5c12070SMiao Xie 677a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 678a22285a6SYan, Zheng pending_snapshot->root = root; 679b83cc969SLi Zefan pending_snapshot->readonly = readonly; 680e9662f70SMiao Xie pending_snapshot->dir = dir; 6818696c533SMiao Xie pending_snapshot->inherit = inherit; 682a22285a6SYan, Zheng 683d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 684a22285a6SYan, Zheng if (IS_ERR(trans)) { 685a22285a6SYan, Zheng ret = PTR_ERR(trans); 686a22285a6SYan, Zheng goto fail; 687a22285a6SYan, Zheng } 688a22285a6SYan, Zheng 6898351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 690a22285a6SYan, Zheng list_add(&pending_snapshot->list, 691a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 6928351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 69372fd032eSSage Weil if (async_transid) { 69472fd032eSSage Weil *async_transid = trans->transid; 69572fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 69672fd032eSSage Weil root->fs_info->extent_root, 1); 69700d71c9cSMiao Xie if (ret) 69800d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 69972fd032eSSage Weil } else { 70072fd032eSSage Weil ret = btrfs_commit_transaction(trans, 70172fd032eSSage Weil root->fs_info->extent_root); 70272fd032eSSage Weil } 703aec8030aSMiao Xie if (ret) 704c37b2b62SJosef Bacik goto fail; 705a22285a6SYan, Zheng 706a22285a6SYan, Zheng ret = pending_snapshot->error; 707f46b5a66SChristoph Hellwig if (ret) 7082e4bfab9SYan, Zheng goto fail; 709f46b5a66SChristoph Hellwig 71066b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 71166b4ffd1SJosef Bacik if (ret) 71266b4ffd1SJosef Bacik goto fail; 713f46b5a66SChristoph Hellwig 7142fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 7152e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7162e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7172e4bfab9SYan, Zheng goto fail; 7182e4bfab9SYan, Zheng } 7195662344bSTsutomu Itoh 7202e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7212e4bfab9SYan, Zheng ret = 0; 7222e4bfab9SYan, Zheng fail: 723d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 724d5c12070SMiao Xie &pending_snapshot->block_rsv, 725d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 7268257b2dcSMiao Xie free: 727a22285a6SYan, Zheng kfree(pending_snapshot); 7288257b2dcSMiao Xie out: 7298257b2dcSMiao Xie atomic_dec(&root->will_be_snapshoted); 730f46b5a66SChristoph Hellwig return ret; 731f46b5a66SChristoph Hellwig } 732f46b5a66SChristoph Hellwig 7334260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 7344260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 7354260f7c7SSage Weil * minimal. 7364260f7c7SSage Weil */ 7374260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 7384260f7c7SSage Weil { 7392f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 7404260f7c7SSage Weil 7414260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 7424260f7c7SSage Weil return 0; 7432f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 7444260f7c7SSage Weil return 0; 7452f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 7464260f7c7SSage Weil return 0; 7474260f7c7SSage Weil return !capable(CAP_FOWNER); 7484260f7c7SSage Weil } 7494260f7c7SSage Weil 7504260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7514260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7524260f7c7SSage Weil * whether the type of victim is right. 7534260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7544260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7554260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7564260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7574260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7584260f7c7SSage Weil * a. be owner of dir, or 7594260f7c7SSage Weil * b. be owner of victim, or 7604260f7c7SSage Weil * c. have CAP_FOWNER capability 7614260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7624260f7c7SSage Weil * links pointing to it. 7634260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7644260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7654260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7664260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7674260f7c7SSage Weil * nfs_async_unlink(). 7684260f7c7SSage Weil */ 7694260f7c7SSage Weil 7704260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7714260f7c7SSage Weil { 7724260f7c7SSage Weil int error; 7734260f7c7SSage Weil 7744260f7c7SSage Weil if (!victim->d_inode) 7754260f7c7SSage Weil return -ENOENT; 7764260f7c7SSage Weil 7774260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 7784fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7794260f7c7SSage Weil 7804260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7814260f7c7SSage Weil if (error) 7824260f7c7SSage Weil return error; 7834260f7c7SSage Weil if (IS_APPEND(dir)) 7844260f7c7SSage Weil return -EPERM; 7854260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 7864260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 7874260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 7884260f7c7SSage Weil return -EPERM; 7894260f7c7SSage Weil if (isdir) { 7904260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 7914260f7c7SSage Weil return -ENOTDIR; 7924260f7c7SSage Weil if (IS_ROOT(victim)) 7934260f7c7SSage Weil return -EBUSY; 7944260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 7954260f7c7SSage Weil return -EISDIR; 7964260f7c7SSage Weil if (IS_DEADDIR(dir)) 7974260f7c7SSage Weil return -ENOENT; 7984260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 7994260f7c7SSage Weil return -EBUSY; 8004260f7c7SSage Weil return 0; 8014260f7c7SSage Weil } 8024260f7c7SSage Weil 803cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 804cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 805cb8e7090SChristoph Hellwig { 806cb8e7090SChristoph Hellwig if (child->d_inode) 807cb8e7090SChristoph Hellwig return -EEXIST; 808cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 809cb8e7090SChristoph Hellwig return -ENOENT; 810cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 811cb8e7090SChristoph Hellwig } 812cb8e7090SChristoph Hellwig 813cb8e7090SChristoph Hellwig /* 814cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 815cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 816cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 817cb8e7090SChristoph Hellwig */ 81876dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 81976dda93cSYan, Zheng char *name, int namelen, 82072fd032eSSage Weil struct btrfs_root *snap_src, 8216f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8228696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 823cb8e7090SChristoph Hellwig { 82476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 825cb8e7090SChristoph Hellwig struct dentry *dentry; 826cb8e7090SChristoph Hellwig int error; 827cb8e7090SChristoph Hellwig 8285c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8295c50c9b8SDavid Sterba if (error == -EINTR) 8305c50c9b8SDavid Sterba return error; 831cb8e7090SChristoph Hellwig 832cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 833cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 834cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 835cb8e7090SChristoph Hellwig goto out_unlock; 836cb8e7090SChristoph Hellwig 837cb8e7090SChristoph Hellwig error = -EEXIST; 838cb8e7090SChristoph Hellwig if (dentry->d_inode) 839cb8e7090SChristoph Hellwig goto out_dput; 840cb8e7090SChristoph Hellwig 84176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 842cb8e7090SChristoph Hellwig if (error) 843a874a63eSLiu Bo goto out_dput; 844cb8e7090SChristoph Hellwig 8459c52057cSChris Mason /* 8469c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8479c52057cSChris Mason * check for them now when we can safely fail 8489c52057cSChris Mason */ 8499c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8509c52057cSChris Mason dir->i_ino, name, 8519c52057cSChris Mason namelen); 8529c52057cSChris Mason if (error) 8539c52057cSChris Mason goto out_dput; 8549c52057cSChris Mason 85576dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 85676dda93cSYan, Zheng 85776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 85876dda93cSYan, Zheng goto out_up_read; 85976dda93cSYan, Zheng 8603de4586cSChris Mason if (snap_src) { 861e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8626f72c7e2SArne Jansen async_transid, readonly, inherit); 8633de4586cSChris Mason } else { 864d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 865d5c12070SMiao Xie async_transid, inherit); 8663de4586cSChris Mason } 86776dda93cSYan, Zheng if (!error) 86876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 86976dda93cSYan, Zheng out_up_read: 87076dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 871cb8e7090SChristoph Hellwig out_dput: 872cb8e7090SChristoph Hellwig dput(dentry); 873cb8e7090SChristoph Hellwig out_unlock: 87476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 875cb8e7090SChristoph Hellwig return error; 876cb8e7090SChristoph Hellwig } 877cb8e7090SChristoph Hellwig 8784cb5300bSChris Mason /* 8794cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8804cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8814cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8824cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8834cb5300bSChris Mason * part of the file 8844cb5300bSChris Mason */ 8854cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 8864cb5300bSChris Mason { 8874cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8884cb5300bSChris Mason struct extent_map *em = NULL; 8894cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8904cb5300bSChris Mason u64 end; 8914cb5300bSChris Mason 8924cb5300bSChris Mason read_lock(&em_tree->lock); 8934cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 8944cb5300bSChris Mason read_unlock(&em_tree->lock); 8954cb5300bSChris Mason 8964cb5300bSChris Mason if (em) { 8974cb5300bSChris Mason end = extent_map_end(em); 8984cb5300bSChris Mason free_extent_map(em); 8994cb5300bSChris Mason if (end - offset > thresh) 9004cb5300bSChris Mason return 0; 9014cb5300bSChris Mason } 9024cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9034cb5300bSChris Mason thresh /= 2; 9044cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9054cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9064cb5300bSChris Mason if (end >= thresh) 9074cb5300bSChris Mason return 0; 9084cb5300bSChris Mason return 1; 9094cb5300bSChris Mason } 9104cb5300bSChris Mason 9114cb5300bSChris Mason /* 9124cb5300bSChris Mason * helper function to walk through a file and find extents 9134cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9144cb5300bSChris Mason * 9154cb5300bSChris Mason * This is used by the defragging code to find new and small 9164cb5300bSChris Mason * extents 9174cb5300bSChris Mason */ 9184cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9194cb5300bSChris Mason struct inode *inode, u64 newer_than, 9204cb5300bSChris Mason u64 *off, int thresh) 9214cb5300bSChris Mason { 9224cb5300bSChris Mason struct btrfs_path *path; 9234cb5300bSChris Mason struct btrfs_key min_key; 9244cb5300bSChris Mason struct extent_buffer *leaf; 9254cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9264cb5300bSChris Mason int type; 9274cb5300bSChris Mason int ret; 928a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9294cb5300bSChris Mason 9304cb5300bSChris Mason path = btrfs_alloc_path(); 9314cb5300bSChris Mason if (!path) 9324cb5300bSChris Mason return -ENOMEM; 9334cb5300bSChris Mason 934a4689d2bSDavid Sterba min_key.objectid = ino; 9354cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9364cb5300bSChris Mason min_key.offset = *off; 9374cb5300bSChris Mason 9384cb5300bSChris Mason while (1) { 939f094c9bdSFilipe Manana path->keep_locks = 1; 9406174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9414cb5300bSChris Mason if (ret != 0) 9424cb5300bSChris Mason goto none; 943f094c9bdSFilipe Manana path->keep_locks = 0; 944f094c9bdSFilipe Manana btrfs_unlock_up_safe(path, 1); 945f094c9bdSFilipe Manana process_slot: 946a4689d2bSDavid Sterba if (min_key.objectid != ino) 9474cb5300bSChris Mason goto none; 9484cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9494cb5300bSChris Mason goto none; 9504cb5300bSChris Mason 9514cb5300bSChris Mason leaf = path->nodes[0]; 9524cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9534cb5300bSChris Mason struct btrfs_file_extent_item); 9544cb5300bSChris Mason 9554cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9564cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9574cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9584cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9594cb5300bSChris Mason *off = min_key.offset; 9604cb5300bSChris Mason btrfs_free_path(path); 9614cb5300bSChris Mason return 0; 9624cb5300bSChris Mason } 9634cb5300bSChris Mason 964f094c9bdSFilipe Manana path->slots[0]++; 965f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 966f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 967f094c9bdSFilipe Manana goto process_slot; 968f094c9bdSFilipe Manana } 969f094c9bdSFilipe Manana 9704cb5300bSChris Mason if (min_key.offset == (u64)-1) 9714cb5300bSChris Mason goto none; 9724cb5300bSChris Mason 9734cb5300bSChris Mason min_key.offset++; 9744cb5300bSChris Mason btrfs_release_path(path); 9754cb5300bSChris Mason } 9764cb5300bSChris Mason none: 9774cb5300bSChris Mason btrfs_free_path(path); 9784cb5300bSChris Mason return -ENOENT; 9794cb5300bSChris Mason } 9804cb5300bSChris Mason 9816c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98217ce6ef8SLiu Bo { 98317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 984940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9856c282eb4SLi Zefan struct extent_map *em; 9866c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 987940100a4SChris Mason 988940100a4SChris Mason /* 989940100a4SChris Mason * hopefully we have this extent in the tree already, try without 990940100a4SChris Mason * the full extent lock 991940100a4SChris Mason */ 992940100a4SChris Mason read_lock(&em_tree->lock); 993940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 994940100a4SChris Mason read_unlock(&em_tree->lock); 995940100a4SChris Mason 996940100a4SChris Mason if (!em) { 997308d9800SFilipe Manana struct extent_state *cached = NULL; 998308d9800SFilipe Manana u64 end = start + len - 1; 999308d9800SFilipe Manana 1000940100a4SChris Mason /* get the big lock and read metadata off disk */ 1001308d9800SFilipe Manana lock_extent_bits(io_tree, start, end, 0, &cached); 1002940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1003308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1004940100a4SChris Mason 10056cf8bfbfSDan Carpenter if (IS_ERR(em)) 10066c282eb4SLi Zefan return NULL; 1007940100a4SChris Mason } 1008940100a4SChris Mason 10096c282eb4SLi Zefan return em; 10106c282eb4SLi Zefan } 10116c282eb4SLi Zefan 10126c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10136c282eb4SLi Zefan { 10146c282eb4SLi Zefan struct extent_map *next; 10156c282eb4SLi Zefan bool ret = true; 10166c282eb4SLi Zefan 10176c282eb4SLi Zefan /* this is the last extent */ 10186c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10196c282eb4SLi Zefan return false; 10206c282eb4SLi Zefan 10216c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1022e2127cf0SFilipe Manana if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE || 1023e2127cf0SFilipe Manana (em->block_start + em->block_len == next->block_start)) 10246c282eb4SLi Zefan ret = false; 10256c282eb4SLi Zefan 10266c282eb4SLi Zefan free_extent_map(next); 10276c282eb4SLi Zefan return ret; 10286c282eb4SLi Zefan } 10296c282eb4SLi Zefan 10306c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 1031a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1032a43a2111SAndrew Mahone int compress) 10336c282eb4SLi Zefan { 10346c282eb4SLi Zefan struct extent_map *em; 10356c282eb4SLi Zefan int ret = 1; 10366c282eb4SLi Zefan bool next_mergeable = true; 10376c282eb4SLi Zefan 10386c282eb4SLi Zefan /* 10396c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10406c282eb4SLi Zefan * defragging it 10416c282eb4SLi Zefan */ 10426c282eb4SLi Zefan if (start < *defrag_end) 10436c282eb4SLi Zefan return 1; 10446c282eb4SLi Zefan 10456c282eb4SLi Zefan *skip = 0; 10466c282eb4SLi Zefan 10476c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10486c282eb4SLi Zefan if (!em) 10496c282eb4SLi Zefan return 0; 10506c282eb4SLi Zefan 1051940100a4SChris Mason /* this will cover holes, and inline extents */ 105217ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1053940100a4SChris Mason ret = 0; 105417ce6ef8SLiu Bo goto out; 105517ce6ef8SLiu Bo } 105617ce6ef8SLiu Bo 10576c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1058940100a4SChris Mason 1059940100a4SChris Mason /* 10606c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10616c282eb4SLi Zefan * real extent, don't bother defragging it 1062940100a4SChris Mason */ 1063a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10646c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 1065940100a4SChris Mason ret = 0; 106617ce6ef8SLiu Bo out: 1067940100a4SChris Mason /* 1068940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1069940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1070940100a4SChris Mason * so that the next tiny extent will force a defrag. 1071940100a4SChris Mason * 1072940100a4SChris Mason * The end result of this is that tiny extents before a single big 1073940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1074940100a4SChris Mason */ 1075940100a4SChris Mason if (ret) { 1076940100a4SChris Mason *defrag_end = extent_map_end(em); 1077940100a4SChris Mason } else { 1078940100a4SChris Mason *last_len = 0; 1079940100a4SChris Mason *skip = extent_map_end(em); 1080940100a4SChris Mason *defrag_end = 0; 1081940100a4SChris Mason } 1082940100a4SChris Mason 1083940100a4SChris Mason free_extent_map(em); 1084940100a4SChris Mason return ret; 1085940100a4SChris Mason } 1086940100a4SChris Mason 10874cb5300bSChris Mason /* 10884cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10894cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10904cb5300bSChris Mason * to COW and defrag. 10914cb5300bSChris Mason * 10924cb5300bSChris Mason * It also makes sure the delalloc code has enough 10934cb5300bSChris Mason * dirty data to avoid making new small extents as part 10944cb5300bSChris Mason * of the defrag 10954cb5300bSChris Mason * 10964cb5300bSChris Mason * It's a good idea to start RA on this range 10974cb5300bSChris Mason * before calling this. 10984cb5300bSChris Mason */ 10994cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11004cb5300bSChris Mason struct page **pages, 11014cb5300bSChris Mason unsigned long start_index, 1102c41570c9SJustin Maggard unsigned long num_pages) 1103f46b5a66SChristoph Hellwig { 11044cb5300bSChris Mason unsigned long file_end; 11054cb5300bSChris Mason u64 isize = i_size_read(inode); 1106f46b5a66SChristoph Hellwig u64 page_start; 1107f46b5a66SChristoph Hellwig u64 page_end; 11081f12bd06SLiu Bo u64 page_cnt; 11094cb5300bSChris Mason int ret; 11104cb5300bSChris Mason int i; 11114cb5300bSChris Mason int i_done; 11124cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11134cb5300bSChris Mason struct extent_state *cached_state = NULL; 1114600a45e1SMiao Xie struct extent_io_tree *tree; 11153b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11164cb5300bSChris Mason 11174cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11181f12bd06SLiu Bo if (!isize || start_index > file_end) 11191f12bd06SLiu Bo return 0; 11201f12bd06SLiu Bo 11211f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11224cb5300bSChris Mason 11234cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 11241f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11254cb5300bSChris Mason if (ret) 11264cb5300bSChris Mason return ret; 11274cb5300bSChris Mason i_done = 0; 1128600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11294cb5300bSChris Mason 11304cb5300bSChris Mason /* step one, lock all the pages */ 11311f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11324cb5300bSChris Mason struct page *page; 1133600a45e1SMiao Xie again: 1134a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11353b16a4e3SJosef Bacik start_index + i, mask); 11364cb5300bSChris Mason if (!page) 11374cb5300bSChris Mason break; 11384cb5300bSChris Mason 1139600a45e1SMiao Xie page_start = page_offset(page); 1140600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1141600a45e1SMiao Xie while (1) { 1142308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1143308d9800SFilipe Manana 0, &cached_state); 1144600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1145600a45e1SMiao Xie page_start); 1146308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1147308d9800SFilipe Manana &cached_state, GFP_NOFS); 1148600a45e1SMiao Xie if (!ordered) 1149600a45e1SMiao Xie break; 1150600a45e1SMiao Xie 1151600a45e1SMiao Xie unlock_page(page); 1152600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1153600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1154600a45e1SMiao Xie lock_page(page); 11551f12bd06SLiu Bo /* 11561f12bd06SLiu Bo * we unlocked the page above, so we need check if 11571f12bd06SLiu Bo * it was released or not. 11581f12bd06SLiu Bo */ 11591f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11601f12bd06SLiu Bo unlock_page(page); 11611f12bd06SLiu Bo page_cache_release(page); 11621f12bd06SLiu Bo goto again; 11631f12bd06SLiu Bo } 1164600a45e1SMiao Xie } 1165600a45e1SMiao Xie 11664cb5300bSChris Mason if (!PageUptodate(page)) { 11674cb5300bSChris Mason btrfs_readpage(NULL, page); 11684cb5300bSChris Mason lock_page(page); 11694cb5300bSChris Mason if (!PageUptodate(page)) { 11704cb5300bSChris Mason unlock_page(page); 11714cb5300bSChris Mason page_cache_release(page); 11724cb5300bSChris Mason ret = -EIO; 11734cb5300bSChris Mason break; 11744cb5300bSChris Mason } 11754cb5300bSChris Mason } 1176600a45e1SMiao Xie 1177600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1178600a45e1SMiao Xie unlock_page(page); 1179600a45e1SMiao Xie page_cache_release(page); 1180600a45e1SMiao Xie goto again; 1181600a45e1SMiao Xie } 1182600a45e1SMiao Xie 11834cb5300bSChris Mason pages[i] = page; 11844cb5300bSChris Mason i_done++; 11854cb5300bSChris Mason } 11864cb5300bSChris Mason if (!i_done || ret) 11874cb5300bSChris Mason goto out; 11884cb5300bSChris Mason 11894cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11904cb5300bSChris Mason goto out; 11914cb5300bSChris Mason 11924cb5300bSChris Mason /* 11934cb5300bSChris Mason * so now we have a nice long stream of locked 11944cb5300bSChris Mason * and up to date pages, lets wait on them 11954cb5300bSChris Mason */ 11964cb5300bSChris Mason for (i = 0; i < i_done; i++) 11974cb5300bSChris Mason wait_on_page_writeback(pages[i]); 11984cb5300bSChris Mason 11994cb5300bSChris Mason page_start = page_offset(pages[0]); 12004cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12014cb5300bSChris Mason 12024cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1203d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 12044cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12054cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12069e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12079e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12084cb5300bSChris Mason 12091f12bd06SLiu Bo if (i_done != page_cnt) { 12109e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12119e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12129e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12134cb5300bSChris Mason btrfs_delalloc_release_space(inode, 12141f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12154cb5300bSChris Mason } 12164cb5300bSChris Mason 12174cb5300bSChris Mason 12189e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12199e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12204cb5300bSChris Mason 12214cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12224cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12234cb5300bSChris Mason GFP_NOFS); 12244cb5300bSChris Mason 12254cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12264cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12274cb5300bSChris Mason ClearPageChecked(pages[i]); 12284cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12294cb5300bSChris Mason set_page_dirty(pages[i]); 12304cb5300bSChris Mason unlock_page(pages[i]); 12314cb5300bSChris Mason page_cache_release(pages[i]); 12324cb5300bSChris Mason } 12334cb5300bSChris Mason return i_done; 12344cb5300bSChris Mason out: 12354cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12364cb5300bSChris Mason unlock_page(pages[i]); 12374cb5300bSChris Mason page_cache_release(pages[i]); 12384cb5300bSChris Mason } 12391f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 12404cb5300bSChris Mason return ret; 12414cb5300bSChris Mason 12424cb5300bSChris Mason } 12434cb5300bSChris Mason 12444cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12454cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12464cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12474cb5300bSChris Mason { 12484cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12494cb5300bSChris Mason struct file_ra_state *ra = NULL; 12504cb5300bSChris Mason unsigned long last_index; 1251151a31b2SLi Zefan u64 isize = i_size_read(inode); 1252940100a4SChris Mason u64 last_len = 0; 1253940100a4SChris Mason u64 skip = 0; 1254940100a4SChris Mason u64 defrag_end = 0; 12554cb5300bSChris Mason u64 newer_off = range->start; 1256f46b5a66SChristoph Hellwig unsigned long i; 1257008873eaSLi Zefan unsigned long ra_index = 0; 1258f46b5a66SChristoph Hellwig int ret; 12594cb5300bSChris Mason int defrag_count = 0; 12601a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 12614cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1262c41570c9SJustin Maggard unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1263c41570c9SJustin Maggard unsigned long cluster = max_cluster; 12644cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 12654cb5300bSChris Mason struct page **pages = NULL; 12664cb5300bSChris Mason 12670abd5b17SLiu Bo if (isize == 0) 12680abd5b17SLiu Bo return 0; 12690abd5b17SLiu Bo 12700abd5b17SLiu Bo if (range->start >= isize) 12710abd5b17SLiu Bo return -EINVAL; 12721a419d85SLi Zefan 12731a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12741a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12751a419d85SLi Zefan return -EINVAL; 12761a419d85SLi Zefan if (range->compress_type) 12771a419d85SLi Zefan compress_type = range->compress_type; 12781a419d85SLi Zefan } 1279f46b5a66SChristoph Hellwig 12800abd5b17SLiu Bo if (extent_thresh == 0) 12810abd5b17SLiu Bo extent_thresh = 256 * 1024; 1282f46b5a66SChristoph Hellwig 12834cb5300bSChris Mason /* 12844cb5300bSChris Mason * if we were not given a file, allocate a readahead 12854cb5300bSChris Mason * context 12864cb5300bSChris Mason */ 12874cb5300bSChris Mason if (!file) { 12884cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 12894cb5300bSChris Mason if (!ra) 12904cb5300bSChris Mason return -ENOMEM; 12914cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 12924cb5300bSChris Mason } else { 12934cb5300bSChris Mason ra = &file->f_ra; 12944cb5300bSChris Mason } 12954cb5300bSChris Mason 1296d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 12974cb5300bSChris Mason GFP_NOFS); 12984cb5300bSChris Mason if (!pages) { 12994cb5300bSChris Mason ret = -ENOMEM; 13004cb5300bSChris Mason goto out_ra; 13014cb5300bSChris Mason } 13024cb5300bSChris Mason 13034cb5300bSChris Mason /* find the last page to defrag */ 13041e701a32SChris Mason if (range->start + range->len > range->start) { 1305151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13061e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13071e701a32SChris Mason } else { 1308151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13091e701a32SChris Mason } 13101e701a32SChris Mason 13114cb5300bSChris Mason if (newer_than) { 13124cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 13134cb5300bSChris Mason &newer_off, 64 * 1024); 13144cb5300bSChris Mason if (!ret) { 13154cb5300bSChris Mason range->start = newer_off; 13164cb5300bSChris Mason /* 13174cb5300bSChris Mason * we always align our defrag to help keep 13184cb5300bSChris Mason * the extents in the file evenly spaced 13194cb5300bSChris Mason */ 13204cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13214cb5300bSChris Mason } else 13224cb5300bSChris Mason goto out_ra; 13234cb5300bSChris Mason } else { 13241e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13254cb5300bSChris Mason } 13264cb5300bSChris Mason if (!max_to_defrag) 13277ec31b54SLiu Bo max_to_defrag = last_index + 1; 13284cb5300bSChris Mason 13292a0f7f57SLi Zefan /* 13302a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13312a0f7f57SLi Zefan * written sequentially. 13322a0f7f57SLi Zefan */ 13332a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13342a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13352a0f7f57SLi Zefan 1336f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1337f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1338f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 13394cb5300bSChris Mason /* 13404cb5300bSChris Mason * make sure we stop running if someone unmounts 13414cb5300bSChris Mason * the FS 13424cb5300bSChris Mason */ 13434cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13444cb5300bSChris Mason break; 13454cb5300bSChris Mason 1346210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1347efe120a0SFrank Holton printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); 1348210549ebSDavid Sterba ret = -EAGAIN; 1349210549ebSDavid Sterba break; 1350210549ebSDavid Sterba } 1351210549ebSDavid Sterba 135266c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13536c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1354a43a2111SAndrew Mahone &defrag_end, range->flags & 1355a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1356940100a4SChris Mason unsigned long next; 1357940100a4SChris Mason /* 1358940100a4SChris Mason * the should_defrag function tells us how much to skip 1359940100a4SChris Mason * bump our counter by the suggested amount 1360940100a4SChris Mason */ 1361940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1362940100a4SChris Mason i = max(i + 1, next); 1363940100a4SChris Mason continue; 1364940100a4SChris Mason } 1365008873eaSLi Zefan 1366008873eaSLi Zefan if (!newer_than) { 1367008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1368008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1369008873eaSLi Zefan cluster = min(cluster, max_cluster); 1370008873eaSLi Zefan } else { 1371008873eaSLi Zefan cluster = max_cluster; 1372008873eaSLi Zefan } 1373008873eaSLi Zefan 1374008873eaSLi Zefan if (i + cluster > ra_index) { 1375008873eaSLi Zefan ra_index = max(i, ra_index); 1376008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1377008873eaSLi Zefan cluster); 1378008873eaSLi Zefan ra_index += max_cluster; 1379008873eaSLi Zefan } 13804cb5300bSChris Mason 1381ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1382633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1383633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1384008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1385ecb8bea8SLiu Bo if (ret < 0) { 1386ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13874cb5300bSChris Mason goto out_ra; 1388ecb8bea8SLiu Bo } 13894cb5300bSChris Mason 13904cb5300bSChris Mason defrag_count += ret; 1391d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 1392ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 13934cb5300bSChris Mason 13944cb5300bSChris Mason if (newer_than) { 13954cb5300bSChris Mason if (newer_off == (u64)-1) 13964cb5300bSChris Mason break; 13974cb5300bSChris Mason 1398e1f041e1SLiu Bo if (ret > 0) 1399e1f041e1SLiu Bo i += ret; 1400e1f041e1SLiu Bo 14014cb5300bSChris Mason newer_off = max(newer_off + 1, 14024cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14034cb5300bSChris Mason 14044cb5300bSChris Mason ret = find_new_extents(root, inode, 14054cb5300bSChris Mason newer_than, &newer_off, 14064cb5300bSChris Mason 64 * 1024); 14074cb5300bSChris Mason if (!ret) { 14084cb5300bSChris Mason range->start = newer_off; 14094cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14104cb5300bSChris Mason } else { 14114cb5300bSChris Mason break; 1412940100a4SChris Mason } 14134cb5300bSChris Mason } else { 1414008873eaSLi Zefan if (ret > 0) { 1415cbcc8326SLi Zefan i += ret; 1416008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1417008873eaSLi Zefan } else { 1418940100a4SChris Mason i++; 1419008873eaSLi Zefan last_len = 0; 1420008873eaSLi Zefan } 1421f46b5a66SChristoph Hellwig } 14224cb5300bSChris Mason } 1423f46b5a66SChristoph Hellwig 1424dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14251e701a32SChris Mason filemap_flush(inode->i_mapping); 1426dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1427dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1428dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1429dec8ef90SFilipe Manana } 14301e701a32SChris Mason 14311e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14321e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14331e701a32SChris Mason * we have to make sure the IO is actually started and that 14341e701a32SChris Mason * ordered extents get created before we return 14351e701a32SChris Mason */ 14361e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14371e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14381e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14391e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14401e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14411e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14421e701a32SChris Mason } 14431e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14441e701a32SChris Mason } 14451e701a32SChris Mason 14461a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14472b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14481a419d85SLi Zefan } 14491a419d85SLi Zefan 145060ccf82fSDiego Calleja ret = defrag_count; 1451940100a4SChris Mason 14524cb5300bSChris Mason out_ra: 1453633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 1454633085c7SFilipe David Borba Manana mutex_lock(&inode->i_mutex); 1455633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 1456633085c7SFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 1457633085c7SFilipe David Borba Manana } 14584cb5300bSChris Mason if (!file) 14594cb5300bSChris Mason kfree(ra); 14604cb5300bSChris Mason kfree(pages); 1461940100a4SChris Mason return ret; 1462f46b5a66SChristoph Hellwig } 1463f46b5a66SChristoph Hellwig 1464198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 146576dda93cSYan, Zheng void __user *arg) 1466f46b5a66SChristoph Hellwig { 1467f46b5a66SChristoph Hellwig u64 new_size; 1468f46b5a66SChristoph Hellwig u64 old_size; 1469f46b5a66SChristoph Hellwig u64 devid = 1; 1470496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1471f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1472f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1473f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1474f46b5a66SChristoph Hellwig char *sizestr; 14759a40f122SGui Hecheng char *retptr; 1476f46b5a66SChristoph Hellwig char *devstr = NULL; 1477f46b5a66SChristoph Hellwig int ret = 0; 1478f46b5a66SChristoph Hellwig int mod = 0; 1479f46b5a66SChristoph Hellwig 1480e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1481e441d54dSChris Mason return -EPERM; 1482e441d54dSChris Mason 1483198605a8SMiao Xie ret = mnt_want_write_file(file); 1484198605a8SMiao Xie if (ret) 1485198605a8SMiao Xie return ret; 1486198605a8SMiao Xie 14875ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14885ac00addSStefan Behrens 1)) { 148997547676SMiao Xie mnt_drop_write_file(file); 1490e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1491c9e9f97bSIlya Dryomov } 1492c9e9f97bSIlya Dryomov 14935ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1494dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1495c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1496c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1497c9e9f97bSIlya Dryomov goto out; 1498c9e9f97bSIlya Dryomov } 14995516e595SMark Fasheh 15005516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1501f46b5a66SChristoph Hellwig 1502f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1503f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1504f46b5a66SChristoph Hellwig if (devstr) { 1505f46b5a66SChristoph Hellwig char *end; 1506f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1507f46b5a66SChristoph Hellwig *devstr = '\0'; 1508f46b5a66SChristoph Hellwig devstr = vol_args->name; 1509f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 1510dfd79829SMiao Xie if (!devid) { 1511dfd79829SMiao Xie ret = -EINVAL; 1512dfd79829SMiao Xie goto out_free; 1513dfd79829SMiao Xie } 1514efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1515f46b5a66SChristoph Hellwig } 1516dba60f3fSMiao Xie 1517aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1518f46b5a66SChristoph Hellwig if (!device) { 1519efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1520c1c9ff7cSGeert Uytterhoeven devid); 1521dfd79829SMiao Xie ret = -ENODEV; 1522c9e9f97bSIlya Dryomov goto out_free; 1523f46b5a66SChristoph Hellwig } 1524dba60f3fSMiao Xie 1525dba60f3fSMiao Xie if (!device->writeable) { 1526efe120a0SFrank Holton btrfs_info(root->fs_info, 1527efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1528c1c9ff7cSGeert Uytterhoeven devid); 1529dfd79829SMiao Xie ret = -EPERM; 15304e42ae1bSLiu Bo goto out_free; 15314e42ae1bSLiu Bo } 15324e42ae1bSLiu Bo 1533f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1534f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1535f46b5a66SChristoph Hellwig else { 1536f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1537f46b5a66SChristoph Hellwig mod = -1; 1538f46b5a66SChristoph Hellwig sizestr++; 1539f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1540f46b5a66SChristoph Hellwig mod = 1; 1541f46b5a66SChristoph Hellwig sizestr++; 1542f46b5a66SChristoph Hellwig } 15439a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15449a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1545f46b5a66SChristoph Hellwig ret = -EINVAL; 1546c9e9f97bSIlya Dryomov goto out_free; 1547f46b5a66SChristoph Hellwig } 1548f46b5a66SChristoph Hellwig } 1549f46b5a66SChristoph Hellwig 155063a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1551dfd79829SMiao Xie ret = -EPERM; 155263a212abSStefan Behrens goto out_free; 155363a212abSStefan Behrens } 155463a212abSStefan Behrens 1555f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1556f46b5a66SChristoph Hellwig 1557f46b5a66SChristoph Hellwig if (mod < 0) { 1558f46b5a66SChristoph Hellwig if (new_size > old_size) { 1559f46b5a66SChristoph Hellwig ret = -EINVAL; 1560c9e9f97bSIlya Dryomov goto out_free; 1561f46b5a66SChristoph Hellwig } 1562f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1563f46b5a66SChristoph Hellwig } else if (mod > 0) { 1564eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1565eb8052e0SWenliang Fan ret = -EINVAL; 1566eb8052e0SWenliang Fan goto out_free; 1567eb8052e0SWenliang Fan } 1568f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1569f46b5a66SChristoph Hellwig } 1570f46b5a66SChristoph Hellwig 1571f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1572f46b5a66SChristoph Hellwig ret = -EINVAL; 1573c9e9f97bSIlya Dryomov goto out_free; 1574f46b5a66SChristoph Hellwig } 1575f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1576f46b5a66SChristoph Hellwig ret = -EFBIG; 1577c9e9f97bSIlya Dryomov goto out_free; 1578f46b5a66SChristoph Hellwig } 1579f46b5a66SChristoph Hellwig 1580f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1581f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1582f46b5a66SChristoph Hellwig 1583efe120a0SFrank Holton printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", 1584c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1585f46b5a66SChristoph Hellwig 1586f46b5a66SChristoph Hellwig if (new_size > old_size) { 1587a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 158898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 158998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1590c9e9f97bSIlya Dryomov goto out_free; 159198d5dc13STsutomu Itoh } 1592f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1593f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1594ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1595f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 15960253f40eSjeff.liu } /* equal, nothing need to do */ 1597f46b5a66SChristoph Hellwig 1598c9e9f97bSIlya Dryomov out_free: 1599f46b5a66SChristoph Hellwig kfree(vol_args); 1600c9e9f97bSIlya Dryomov out: 1601c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16025ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 160318f39c41SIlya Dryomov mnt_drop_write_file(file); 1604f46b5a66SChristoph Hellwig return ret; 1605f46b5a66SChristoph Hellwig } 1606f46b5a66SChristoph Hellwig 160772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16086f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16096f72c7e2SArne Jansen u64 *transid, bool readonly, 16108696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1611f46b5a66SChristoph Hellwig { 1612f46b5a66SChristoph Hellwig int namelen; 16133de4586cSChris Mason int ret = 0; 1614f46b5a66SChristoph Hellwig 1615a874a63eSLiu Bo ret = mnt_want_write_file(file); 1616a874a63eSLiu Bo if (ret) 1617a874a63eSLiu Bo goto out; 1618a874a63eSLiu Bo 161972fd032eSSage Weil namelen = strlen(name); 162072fd032eSSage Weil if (strchr(name, '/')) { 1621f46b5a66SChristoph Hellwig ret = -EINVAL; 1622a874a63eSLiu Bo goto out_drop_write; 1623f46b5a66SChristoph Hellwig } 1624f46b5a66SChristoph Hellwig 162516780cabSChris Mason if (name[0] == '.' && 162616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 162716780cabSChris Mason ret = -EEXIST; 1628a874a63eSLiu Bo goto out_drop_write; 162916780cabSChris Mason } 163016780cabSChris Mason 16313de4586cSChris Mason if (subvol) { 163272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16336f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1634cb8e7090SChristoph Hellwig } else { 16352903ff01SAl Viro struct fd src = fdget(fd); 16363de4586cSChris Mason struct inode *src_inode; 16372903ff01SAl Viro if (!src.file) { 16383de4586cSChris Mason ret = -EINVAL; 1639a874a63eSLiu Bo goto out_drop_write; 16403de4586cSChris Mason } 16413de4586cSChris Mason 1642496ad9aaSAl Viro src_inode = file_inode(src.file); 1643496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1644efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1645efe120a0SFrank Holton "Snapshot src from another FS"); 164623ad5b17SKusanagi Kouichi ret = -EXDEV; 1647d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1648d0242061SDavid Sterba /* 1649d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1650d0242061SDavid Sterba * are limited to own subvolumes only 1651d0242061SDavid Sterba */ 1652d0242061SDavid Sterba ret = -EPERM; 1653ecd18815SAl Viro } else { 165472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 165572fd032eSSage Weil BTRFS_I(src_inode)->root, 16566f72c7e2SArne Jansen transid, readonly, inherit); 1657ecd18815SAl Viro } 16582903ff01SAl Viro fdput(src); 1659cb8e7090SChristoph Hellwig } 1660a874a63eSLiu Bo out_drop_write: 1661a874a63eSLiu Bo mnt_drop_write_file(file); 1662f46b5a66SChristoph Hellwig out: 166372fd032eSSage Weil return ret; 166472fd032eSSage Weil } 166572fd032eSSage Weil 166672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1667fa0d2b9bSLi Zefan void __user *arg, int subvol) 166872fd032eSSage Weil { 1669fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 167072fd032eSSage Weil int ret; 167172fd032eSSage Weil 1672fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1673fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1674fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1675fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1676fa0d2b9bSLi Zefan 1677fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1678b83cc969SLi Zefan vol_args->fd, subvol, 16796f72c7e2SArne Jansen NULL, false, NULL); 1680fa0d2b9bSLi Zefan 1681fa0d2b9bSLi Zefan kfree(vol_args); 1682fa0d2b9bSLi Zefan return ret; 1683fa0d2b9bSLi Zefan } 1684fa0d2b9bSLi Zefan 1685fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1686fa0d2b9bSLi Zefan void __user *arg, int subvol) 1687fa0d2b9bSLi Zefan { 1688fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1689fa0d2b9bSLi Zefan int ret; 1690fdfb1e4fSLi Zefan u64 transid = 0; 1691fdfb1e4fSLi Zefan u64 *ptr = NULL; 1692b83cc969SLi Zefan bool readonly = false; 16936f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 169472fd032eSSage Weil 1695fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1696fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1697fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1698fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1699fdfb1e4fSLi Zefan 1700b83cc969SLi Zefan if (vol_args->flags & 17016f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17026f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1703b83cc969SLi Zefan ret = -EOPNOTSUPP; 1704fdfb1e4fSLi Zefan goto out; 1705fdfb1e4fSLi Zefan } 1706fdfb1e4fSLi Zefan 1707fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1708fdfb1e4fSLi Zefan ptr = &transid; 1709b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1710b83cc969SLi Zefan readonly = true; 17116f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17126f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17136f72c7e2SArne Jansen ret = -EINVAL; 17146f72c7e2SArne Jansen goto out; 17156f72c7e2SArne Jansen } 17166f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17176f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17186f72c7e2SArne Jansen ret = PTR_ERR(inherit); 17196f72c7e2SArne Jansen goto out; 17206f72c7e2SArne Jansen } 17216f72c7e2SArne Jansen } 172275eaa0e2SSage Weil 1723fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17246f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17258696c533SMiao Xie readonly, inherit); 172675eaa0e2SSage Weil 1727fdfb1e4fSLi Zefan if (ret == 0 && ptr && 172875eaa0e2SSage Weil copy_to_user(arg + 1729fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1730fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 173175eaa0e2SSage Weil ret = -EFAULT; 1732fdfb1e4fSLi Zefan out: 1733f46b5a66SChristoph Hellwig kfree(vol_args); 17346f72c7e2SArne Jansen kfree(inherit); 1735f46b5a66SChristoph Hellwig return ret; 1736f46b5a66SChristoph Hellwig } 1737f46b5a66SChristoph Hellwig 17380caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17390caa102dSLi Zefan void __user *arg) 17400caa102dSLi Zefan { 1741496ad9aaSAl Viro struct inode *inode = file_inode(file); 17420caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17430caa102dSLi Zefan int ret = 0; 17440caa102dSLi Zefan u64 flags = 0; 17450caa102dSLi Zefan 174633345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17470caa102dSLi Zefan return -EINVAL; 17480caa102dSLi Zefan 17490caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17500caa102dSLi Zefan if (btrfs_root_readonly(root)) 17510caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17520caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17530caa102dSLi Zefan 17540caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17550caa102dSLi Zefan ret = -EFAULT; 17560caa102dSLi Zefan 17570caa102dSLi Zefan return ret; 17580caa102dSLi Zefan } 17590caa102dSLi Zefan 17600caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17610caa102dSLi Zefan void __user *arg) 17620caa102dSLi Zefan { 1763496ad9aaSAl Viro struct inode *inode = file_inode(file); 17640caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17650caa102dSLi Zefan struct btrfs_trans_handle *trans; 17660caa102dSLi Zefan u64 root_flags; 17670caa102dSLi Zefan u64 flags; 17680caa102dSLi Zefan int ret = 0; 17690caa102dSLi Zefan 1770bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1771bd60ea0fSDavid Sterba return -EPERM; 1772bd60ea0fSDavid Sterba 1773b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1774b9ca0664SLiu Bo if (ret) 1775b9ca0664SLiu Bo goto out; 17760caa102dSLi Zefan 1777b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1778b9ca0664SLiu Bo ret = -EINVAL; 1779b9ca0664SLiu Bo goto out_drop_write; 1780b9ca0664SLiu Bo } 17810caa102dSLi Zefan 1782b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1783b9ca0664SLiu Bo ret = -EFAULT; 1784b9ca0664SLiu Bo goto out_drop_write; 1785b9ca0664SLiu Bo } 17860caa102dSLi Zefan 1787b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1788b9ca0664SLiu Bo ret = -EINVAL; 1789b9ca0664SLiu Bo goto out_drop_write; 1790b9ca0664SLiu Bo } 17910caa102dSLi Zefan 1792b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1793b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1794b9ca0664SLiu Bo goto out_drop_write; 1795b9ca0664SLiu Bo } 17960caa102dSLi Zefan 17970caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 17980caa102dSLi Zefan 17990caa102dSLi Zefan /* nothing to do */ 18000caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1801b9ca0664SLiu Bo goto out_drop_sem; 18020caa102dSLi Zefan 18030caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18042c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18050caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18060caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18072c686537SDavid Sterba } else { 18082c686537SDavid Sterba /* 18092c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18102c686537SDavid Sterba * send 18112c686537SDavid Sterba */ 18122c686537SDavid Sterba spin_lock(&root->root_item_lock); 18132c686537SDavid Sterba if (root->send_in_progress == 0) { 18140caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18150caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18162c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18172c686537SDavid Sterba } else { 18182c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18192c686537SDavid Sterba btrfs_warn(root->fs_info, 18202c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18212c686537SDavid Sterba root->root_key.objectid); 18222c686537SDavid Sterba ret = -EPERM; 18232c686537SDavid Sterba goto out_drop_sem; 18242c686537SDavid Sterba } 18252c686537SDavid Sterba } 18260caa102dSLi Zefan 18270caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18280caa102dSLi Zefan if (IS_ERR(trans)) { 18290caa102dSLi Zefan ret = PTR_ERR(trans); 18300caa102dSLi Zefan goto out_reset; 18310caa102dSLi Zefan } 18320caa102dSLi Zefan 1833b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18340caa102dSLi Zefan &root->root_key, &root->root_item); 18350caa102dSLi Zefan 18360caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18370caa102dSLi Zefan out_reset: 18380caa102dSLi Zefan if (ret) 18390caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1840b9ca0664SLiu Bo out_drop_sem: 18410caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1842b9ca0664SLiu Bo out_drop_write: 1843b9ca0664SLiu Bo mnt_drop_write_file(file); 1844b9ca0664SLiu Bo out: 18450caa102dSLi Zefan return ret; 18460caa102dSLi Zefan } 18470caa102dSLi Zefan 184876dda93cSYan, Zheng /* 184976dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 185076dda93cSYan, Zheng */ 185176dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 185276dda93cSYan, Zheng { 185376dda93cSYan, Zheng struct btrfs_path *path; 1854175a2b87SJosef Bacik struct btrfs_dir_item *di; 185576dda93cSYan, Zheng struct btrfs_key key; 1856175a2b87SJosef Bacik u64 dir_id; 185776dda93cSYan, Zheng int ret; 185876dda93cSYan, Zheng 185976dda93cSYan, Zheng path = btrfs_alloc_path(); 186076dda93cSYan, Zheng if (!path) 186176dda93cSYan, Zheng return -ENOMEM; 186276dda93cSYan, Zheng 1863175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1864175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1865175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1866175a2b87SJosef Bacik dir_id, "default", 7, 0); 1867175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1868175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1869175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 187072de6b53SGuangyu Sun ret = -EPERM; 187172de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 187272de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1873175a2b87SJosef Bacik goto out; 1874175a2b87SJosef Bacik } 1875175a2b87SJosef Bacik btrfs_release_path(path); 1876175a2b87SJosef Bacik } 1877175a2b87SJosef Bacik 187876dda93cSYan, Zheng key.objectid = root->root_key.objectid; 187976dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 188076dda93cSYan, Zheng key.offset = (u64)-1; 188176dda93cSYan, Zheng 188276dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 188376dda93cSYan, Zheng &key, path, 0, 0); 188476dda93cSYan, Zheng if (ret < 0) 188576dda93cSYan, Zheng goto out; 188676dda93cSYan, Zheng BUG_ON(ret == 0); 188776dda93cSYan, Zheng 188876dda93cSYan, Zheng ret = 0; 188976dda93cSYan, Zheng if (path->slots[0] > 0) { 189076dda93cSYan, Zheng path->slots[0]--; 189176dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 189276dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 189376dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 189476dda93cSYan, Zheng ret = -ENOTEMPTY; 189576dda93cSYan, Zheng } 189676dda93cSYan, Zheng out: 189776dda93cSYan, Zheng btrfs_free_path(path); 189876dda93cSYan, Zheng return ret; 189976dda93cSYan, Zheng } 190076dda93cSYan, Zheng 1901ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1902ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1903ac8e9819SChris Mason { 1904abc6e134SChris Mason struct btrfs_key test; 1905abc6e134SChris Mason int ret; 1906abc6e134SChris Mason 1907abc6e134SChris Mason test.objectid = sk->min_objectid; 1908abc6e134SChris Mason test.type = sk->min_type; 1909abc6e134SChris Mason test.offset = sk->min_offset; 1910abc6e134SChris Mason 1911abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1912abc6e134SChris Mason if (ret < 0) 1913ac8e9819SChris Mason return 0; 1914abc6e134SChris Mason 1915abc6e134SChris Mason test.objectid = sk->max_objectid; 1916abc6e134SChris Mason test.type = sk->max_type; 1917abc6e134SChris Mason test.offset = sk->max_offset; 1918abc6e134SChris Mason 1919abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1920abc6e134SChris Mason if (ret > 0) 1921ac8e9819SChris Mason return 0; 1922ac8e9819SChris Mason return 1; 1923ac8e9819SChris Mason } 1924ac8e9819SChris Mason 1925ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1926ac8e9819SChris Mason struct btrfs_path *path, 1927ac8e9819SChris Mason struct btrfs_key *key, 1928ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1929ac8e9819SChris Mason char *buf, 1930ac8e9819SChris Mason unsigned long *sk_offset, 1931ac8e9819SChris Mason int *num_found) 1932ac8e9819SChris Mason { 1933ac8e9819SChris Mason u64 found_transid; 1934ac8e9819SChris Mason struct extent_buffer *leaf; 1935ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1936ac8e9819SChris Mason unsigned long item_off; 1937ac8e9819SChris Mason unsigned long item_len; 1938ac8e9819SChris Mason int nritems; 1939ac8e9819SChris Mason int i; 1940ac8e9819SChris Mason int slot; 1941ac8e9819SChris Mason int ret = 0; 1942ac8e9819SChris Mason 1943ac8e9819SChris Mason leaf = path->nodes[0]; 1944ac8e9819SChris Mason slot = path->slots[0]; 1945ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1946ac8e9819SChris Mason 1947ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1948ac8e9819SChris Mason i = nritems; 1949ac8e9819SChris Mason goto advance_key; 1950ac8e9819SChris Mason } 1951ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1952ac8e9819SChris Mason 1953ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1954ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1955ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1956ac8e9819SChris Mason 195703b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 195803b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 195903b71c6cSGabriel de Perthuis continue; 196003b71c6cSGabriel de Perthuis 196103b71c6cSGabriel de Perthuis if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1962ac8e9819SChris Mason item_len = 0; 1963ac8e9819SChris Mason 1964ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1965ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1966ac8e9819SChris Mason ret = 1; 1967ac8e9819SChris Mason goto overflow; 1968ac8e9819SChris Mason } 1969ac8e9819SChris Mason 1970ac8e9819SChris Mason sh.objectid = key->objectid; 1971ac8e9819SChris Mason sh.offset = key->offset; 1972ac8e9819SChris Mason sh.type = key->type; 1973ac8e9819SChris Mason sh.len = item_len; 1974ac8e9819SChris Mason sh.transid = found_transid; 1975ac8e9819SChris Mason 1976ac8e9819SChris Mason /* copy search result header */ 1977ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1978ac8e9819SChris Mason *sk_offset += sizeof(sh); 1979ac8e9819SChris Mason 1980ac8e9819SChris Mason if (item_len) { 1981ac8e9819SChris Mason char *p = buf + *sk_offset; 1982ac8e9819SChris Mason /* copy the item */ 1983ac8e9819SChris Mason read_extent_buffer(leaf, p, 1984ac8e9819SChris Mason item_off, item_len); 1985ac8e9819SChris Mason *sk_offset += item_len; 1986ac8e9819SChris Mason } 1987e2156867SHugo Mills (*num_found)++; 1988ac8e9819SChris Mason 1989ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1990ac8e9819SChris Mason break; 1991ac8e9819SChris Mason } 1992ac8e9819SChris Mason advance_key: 1993ac8e9819SChris Mason ret = 0; 1994abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1995abc6e134SChris Mason key->offset++; 1996abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1997abc6e134SChris Mason key->offset = 0; 1998abc6e134SChris Mason key->type++; 1999abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 2000abc6e134SChris Mason key->offset = 0; 2001abc6e134SChris Mason key->type = 0; 2002abc6e134SChris Mason key->objectid++; 2003abc6e134SChris Mason } else 2004abc6e134SChris Mason ret = 1; 2005ac8e9819SChris Mason overflow: 2006ac8e9819SChris Mason return ret; 2007ac8e9819SChris Mason } 2008ac8e9819SChris Mason 2009ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 2010ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 2011ac8e9819SChris Mason { 2012ac8e9819SChris Mason struct btrfs_root *root; 2013ac8e9819SChris Mason struct btrfs_key key; 2014ac8e9819SChris Mason struct btrfs_path *path; 2015ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 2016ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2017ac8e9819SChris Mason int ret; 2018ac8e9819SChris Mason int num_found = 0; 2019ac8e9819SChris Mason unsigned long sk_offset = 0; 2020ac8e9819SChris Mason 2021ac8e9819SChris Mason path = btrfs_alloc_path(); 2022ac8e9819SChris Mason if (!path) 2023ac8e9819SChris Mason return -ENOMEM; 2024ac8e9819SChris Mason 2025ac8e9819SChris Mason if (sk->tree_id == 0) { 2026ac8e9819SChris Mason /* search the root of the inode that was passed */ 2027ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2028ac8e9819SChris Mason } else { 2029ac8e9819SChris Mason key.objectid = sk->tree_id; 2030ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2031ac8e9819SChris Mason key.offset = (u64)-1; 2032ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2033ac8e9819SChris Mason if (IS_ERR(root)) { 2034efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", 2035ac8e9819SChris Mason sk->tree_id); 2036ac8e9819SChris Mason btrfs_free_path(path); 2037ac8e9819SChris Mason return -ENOENT; 2038ac8e9819SChris Mason } 2039ac8e9819SChris Mason } 2040ac8e9819SChris Mason 2041ac8e9819SChris Mason key.objectid = sk->min_objectid; 2042ac8e9819SChris Mason key.type = sk->min_type; 2043ac8e9819SChris Mason key.offset = sk->min_offset; 2044ac8e9819SChris Mason 2045ac8e9819SChris Mason path->keep_locks = 1; 2046ac8e9819SChris Mason 2047ac8e9819SChris Mason while (1) { 20486174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2049ac8e9819SChris Mason if (ret != 0) { 2050ac8e9819SChris Mason if (ret > 0) 2051ac8e9819SChris Mason ret = 0; 2052ac8e9819SChris Mason goto err; 2053ac8e9819SChris Mason } 2054ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 2055ac8e9819SChris Mason &sk_offset, &num_found); 2056b3b4aa74SDavid Sterba btrfs_release_path(path); 2057ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 2058ac8e9819SChris Mason break; 2059ac8e9819SChris Mason 2060ac8e9819SChris Mason } 2061ac8e9819SChris Mason ret = 0; 2062ac8e9819SChris Mason err: 2063ac8e9819SChris Mason sk->nr_items = num_found; 2064ac8e9819SChris Mason btrfs_free_path(path); 2065ac8e9819SChris Mason return ret; 2066ac8e9819SChris Mason } 2067ac8e9819SChris Mason 2068ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2069ac8e9819SChris Mason void __user *argp) 2070ac8e9819SChris Mason { 2071ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 2072ac8e9819SChris Mason struct inode *inode; 2073ac8e9819SChris Mason int ret; 2074ac8e9819SChris Mason 2075ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2076ac8e9819SChris Mason return -EPERM; 2077ac8e9819SChris Mason 20782354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20792354d08fSJulia Lawall if (IS_ERR(args)) 20802354d08fSJulia Lawall return PTR_ERR(args); 2081ac8e9819SChris Mason 2082496ad9aaSAl Viro inode = file_inode(file); 2083ac8e9819SChris Mason ret = search_ioctl(inode, args); 2084ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2085ac8e9819SChris Mason ret = -EFAULT; 2086ac8e9819SChris Mason kfree(args); 2087ac8e9819SChris Mason return ret; 2088ac8e9819SChris Mason } 2089ac8e9819SChris Mason 209098d377a0STARUISI Hiroaki /* 2091ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2092ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 209398d377a0STARUISI Hiroaki */ 209498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 209598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 209698d377a0STARUISI Hiroaki { 209798d377a0STARUISI Hiroaki struct btrfs_root *root; 209898d377a0STARUISI Hiroaki struct btrfs_key key; 2099ac8e9819SChris Mason char *ptr; 210098d377a0STARUISI Hiroaki int ret = -1; 210198d377a0STARUISI Hiroaki int slot; 210298d377a0STARUISI Hiroaki int len; 210398d377a0STARUISI Hiroaki int total_len = 0; 210498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 210598d377a0STARUISI Hiroaki struct extent_buffer *l; 210698d377a0STARUISI Hiroaki struct btrfs_path *path; 210798d377a0STARUISI Hiroaki 210898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 210998d377a0STARUISI Hiroaki name[0]='\0'; 211098d377a0STARUISI Hiroaki return 0; 211198d377a0STARUISI Hiroaki } 211298d377a0STARUISI Hiroaki 211398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 211498d377a0STARUISI Hiroaki if (!path) 211598d377a0STARUISI Hiroaki return -ENOMEM; 211698d377a0STARUISI Hiroaki 2117ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 211898d377a0STARUISI Hiroaki 211998d377a0STARUISI Hiroaki key.objectid = tree_id; 212098d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 212198d377a0STARUISI Hiroaki key.offset = (u64)-1; 212298d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 212398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2124efe120a0SFrank Holton printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); 21258ad6fcabSChris Mason ret = -ENOENT; 21268ad6fcabSChris Mason goto out; 212798d377a0STARUISI Hiroaki } 212898d377a0STARUISI Hiroaki 212998d377a0STARUISI Hiroaki key.objectid = dirid; 213098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 21318ad6fcabSChris Mason key.offset = (u64)-1; 213298d377a0STARUISI Hiroaki 213398d377a0STARUISI Hiroaki while (1) { 213498d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 213598d377a0STARUISI Hiroaki if (ret < 0) 213698d377a0STARUISI Hiroaki goto out; 213718674c6cSFilipe David Borba Manana else if (ret > 0) { 213818674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 213918674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 214018674c6cSFilipe David Borba Manana if (ret < 0) 214118674c6cSFilipe David Borba Manana goto out; 214218674c6cSFilipe David Borba Manana else if (ret > 0) { 2143ac8e9819SChris Mason ret = -ENOENT; 214498d377a0STARUISI Hiroaki goto out; 2145ac8e9819SChris Mason } 214618674c6cSFilipe David Borba Manana } 214718674c6cSFilipe David Borba Manana 214818674c6cSFilipe David Borba Manana l = path->nodes[0]; 214918674c6cSFilipe David Borba Manana slot = path->slots[0]; 215018674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 215198d377a0STARUISI Hiroaki 215298d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 215398d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 215498d377a0STARUISI Hiroaki ptr -= len + 1; 215598d377a0STARUISI Hiroaki total_len += len + 1; 2156a696cf35SFilipe David Borba Manana if (ptr < name) { 2157a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 215898d377a0STARUISI Hiroaki goto out; 2159a696cf35SFilipe David Borba Manana } 216098d377a0STARUISI Hiroaki 216198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 216298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 216398d377a0STARUISI Hiroaki 216498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 216598d377a0STARUISI Hiroaki break; 216698d377a0STARUISI Hiroaki 2167b3b4aa74SDavid Sterba btrfs_release_path(path); 216898d377a0STARUISI Hiroaki key.objectid = key.offset; 21698ad6fcabSChris Mason key.offset = (u64)-1; 217098d377a0STARUISI Hiroaki dirid = key.objectid; 217198d377a0STARUISI Hiroaki } 217277906a50SLi Zefan memmove(name, ptr, total_len); 217398d377a0STARUISI Hiroaki name[total_len] = '\0'; 217498d377a0STARUISI Hiroaki ret = 0; 217598d377a0STARUISI Hiroaki out: 217698d377a0STARUISI Hiroaki btrfs_free_path(path); 2177ac8e9819SChris Mason return ret; 2178ac8e9819SChris Mason } 2179ac8e9819SChris Mason 2180ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2181ac8e9819SChris Mason void __user *argp) 2182ac8e9819SChris Mason { 2183ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2184ac8e9819SChris Mason struct inode *inode; 2185ac8e9819SChris Mason int ret; 2186ac8e9819SChris Mason 2187ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2188ac8e9819SChris Mason return -EPERM; 2189ac8e9819SChris Mason 21902354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 21912354d08fSJulia Lawall if (IS_ERR(args)) 21922354d08fSJulia Lawall return PTR_ERR(args); 2193c2b96929SDan Carpenter 2194496ad9aaSAl Viro inode = file_inode(file); 2195ac8e9819SChris Mason 21961b53ac4dSChris Mason if (args->treeid == 0) 21971b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 21981b53ac4dSChris Mason 2199ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2200ac8e9819SChris Mason args->treeid, args->objectid, 2201ac8e9819SChris Mason args->name); 2202ac8e9819SChris Mason 2203ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2204ac8e9819SChris Mason ret = -EFAULT; 2205ac8e9819SChris Mason 2206ac8e9819SChris Mason kfree(args); 220798d377a0STARUISI Hiroaki return ret; 220898d377a0STARUISI Hiroaki } 220998d377a0STARUISI Hiroaki 221076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 221176dda93cSYan, Zheng void __user *arg) 221276dda93cSYan, Zheng { 221354563d41SAl Viro struct dentry *parent = file->f_path.dentry; 221476dda93cSYan, Zheng struct dentry *dentry; 221576dda93cSYan, Zheng struct inode *dir = parent->d_inode; 221676dda93cSYan, Zheng struct inode *inode; 221776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 221876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 221976dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 222076dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2221c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2222c58aaad2SMiao Xie u64 qgroup_reserved; 222376dda93cSYan, Zheng int namelen; 222476dda93cSYan, Zheng int ret; 222576dda93cSYan, Zheng int err = 0; 222676dda93cSYan, Zheng 222776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 222876dda93cSYan, Zheng if (IS_ERR(vol_args)) 222976dda93cSYan, Zheng return PTR_ERR(vol_args); 223076dda93cSYan, Zheng 223176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 223276dda93cSYan, Zheng namelen = strlen(vol_args->name); 223376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 223476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 223576dda93cSYan, Zheng err = -EINVAL; 223676dda93cSYan, Zheng goto out; 223776dda93cSYan, Zheng } 223876dda93cSYan, Zheng 2239a561be71SAl Viro err = mnt_want_write_file(file); 224076dda93cSYan, Zheng if (err) 224176dda93cSYan, Zheng goto out; 224276dda93cSYan, Zheng 22435c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 22445c50c9b8SDavid Sterba if (err == -EINTR) 2245e43f998eSDavid Sterba goto out_drop_write; 224676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 224776dda93cSYan, Zheng if (IS_ERR(dentry)) { 224876dda93cSYan, Zheng err = PTR_ERR(dentry); 224976dda93cSYan, Zheng goto out_unlock_dir; 225076dda93cSYan, Zheng } 225176dda93cSYan, Zheng 225276dda93cSYan, Zheng if (!dentry->d_inode) { 225376dda93cSYan, Zheng err = -ENOENT; 225476dda93cSYan, Zheng goto out_dput; 225576dda93cSYan, Zheng } 225676dda93cSYan, Zheng 225776dda93cSYan, Zheng inode = dentry->d_inode; 22584260f7c7SSage Weil dest = BTRFS_I(inode)->root; 22594260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 22604260f7c7SSage Weil /* 22614260f7c7SSage Weil * Regular user. Only allow this with a special mount 22624260f7c7SSage Weil * option, when the user has write+exec access to the 22634260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 22644260f7c7SSage Weil * allowed. 22654260f7c7SSage Weil * 22664260f7c7SSage Weil * Note that this is _not_ check that the subvol is 22674260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 22684260f7c7SSage Weil * otherwise be able to delete. 22694260f7c7SSage Weil * 22704260f7c7SSage Weil * Users who want to delete empty subvols should try 22714260f7c7SSage Weil * rmdir(2). 22724260f7c7SSage Weil */ 22734260f7c7SSage Weil err = -EPERM; 22744260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 22754260f7c7SSage Weil goto out_dput; 22764260f7c7SSage Weil 22774260f7c7SSage Weil /* 22784260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 22794260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 22804260f7c7SSage Weil * must be called on the dentry referencing the root 22814260f7c7SSage Weil * of the subvol, not a random directory contained 22824260f7c7SSage Weil * within it. 22834260f7c7SSage Weil */ 22844260f7c7SSage Weil err = -EINVAL; 22854260f7c7SSage Weil if (root == dest) 22864260f7c7SSage Weil goto out_dput; 22874260f7c7SSage Weil 22884260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 22894260f7c7SSage Weil if (err) 22904260f7c7SSage Weil goto out_dput; 22915c39da5bSMiao Xie } 22924260f7c7SSage Weil 22935c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 22944260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 22954260f7c7SSage Weil if (err) 22964260f7c7SSage Weil goto out_dput; 22974260f7c7SSage Weil 229833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 229976dda93cSYan, Zheng err = -EINVAL; 230076dda93cSYan, Zheng goto out_dput; 230176dda93cSYan, Zheng } 230276dda93cSYan, Zheng 230376dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 230476dda93cSYan, Zheng err = d_invalidate(dentry); 230576dda93cSYan, Zheng if (err) 230676dda93cSYan, Zheng goto out_unlock; 230776dda93cSYan, Zheng 230876dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 230976dda93cSYan, Zheng 231076dda93cSYan, Zheng err = may_destroy_subvol(dest); 231176dda93cSYan, Zheng if (err) 231276dda93cSYan, Zheng goto out_up_write; 231376dda93cSYan, Zheng 2314c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2315c58aaad2SMiao Xie /* 2316c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2317c58aaad2SMiao Xie * ref/backref. 2318c58aaad2SMiao Xie */ 2319c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2320ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2321c58aaad2SMiao Xie if (err) 2322c58aaad2SMiao Xie goto out_up_write; 2323c58aaad2SMiao Xie 2324a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2325a22285a6SYan, Zheng if (IS_ERR(trans)) { 2326a22285a6SYan, Zheng err = PTR_ERR(trans); 2327c58aaad2SMiao Xie goto out_release; 2328a22285a6SYan, Zheng } 2329c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2330c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2331a22285a6SYan, Zheng 233276dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 233376dda93cSYan, Zheng dest->root_key.objectid, 233476dda93cSYan, Zheng dentry->d_name.name, 233576dda93cSYan, Zheng dentry->d_name.len); 233679787eaaSJeff Mahoney if (ret) { 233779787eaaSJeff Mahoney err = ret; 233879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 233979787eaaSJeff Mahoney goto out_end_trans; 234079787eaaSJeff Mahoney } 234176dda93cSYan, Zheng 234276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 234376dda93cSYan, Zheng 234476dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 234576dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 234676dda93cSYan, Zheng dest->root_item.drop_level = 0; 234776dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 234876dda93cSYan, Zheng 2349d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 235076dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 235176dda93cSYan, Zheng root->fs_info->tree_root, 235276dda93cSYan, Zheng dest->root_key.objectid); 235379787eaaSJeff Mahoney if (ret) { 235479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 235579787eaaSJeff Mahoney err = ret; 235679787eaaSJeff Mahoney goto out_end_trans; 2357d68fc57bSYan, Zheng } 235879787eaaSJeff Mahoney } 2359dd5f9615SStefan Behrens 2360dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2361dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2362dd5f9615SStefan Behrens dest->root_key.objectid); 2363dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2364dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2365dd5f9615SStefan Behrens err = ret; 2366dd5f9615SStefan Behrens goto out_end_trans; 2367dd5f9615SStefan Behrens } 2368dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2369dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2370dd5f9615SStefan Behrens dest->root_item.received_uuid, 2371dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2372dd5f9615SStefan Behrens dest->root_key.objectid); 2373dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2374dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2375dd5f9615SStefan Behrens err = ret; 2376dd5f9615SStefan Behrens goto out_end_trans; 2377dd5f9615SStefan Behrens } 2378dd5f9615SStefan Behrens } 2379dd5f9615SStefan Behrens 238079787eaaSJeff Mahoney out_end_trans: 2381c58aaad2SMiao Xie trans->block_rsv = NULL; 2382c58aaad2SMiao Xie trans->bytes_reserved = 0; 2383531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 238479787eaaSJeff Mahoney if (ret && !err) 238579787eaaSJeff Mahoney err = ret; 238676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2387c58aaad2SMiao Xie out_release: 2388c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 238976dda93cSYan, Zheng out_up_write: 239076dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 239176dda93cSYan, Zheng out_unlock: 239276dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 239376dda93cSYan, Zheng if (!err) { 2394efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 239576dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 239676dda93cSYan, Zheng d_delete(dentry); 2397fa6ac876SLiu Bo 2398fa6ac876SLiu Bo /* the last ref */ 2399fa6ac876SLiu Bo if (dest->cache_inode) { 2400fa6ac876SLiu Bo iput(dest->cache_inode); 2401fa6ac876SLiu Bo dest->cache_inode = NULL; 2402fa6ac876SLiu Bo } 240376dda93cSYan, Zheng } 240476dda93cSYan, Zheng out_dput: 240576dda93cSYan, Zheng dput(dentry); 240676dda93cSYan, Zheng out_unlock_dir: 240776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 2408e43f998eSDavid Sterba out_drop_write: 24092a79f17eSAl Viro mnt_drop_write_file(file); 241076dda93cSYan, Zheng out: 241176dda93cSYan, Zheng kfree(vol_args); 241276dda93cSYan, Zheng return err; 241376dda93cSYan, Zheng } 241476dda93cSYan, Zheng 24151e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2416f46b5a66SChristoph Hellwig { 2417496ad9aaSAl Viro struct inode *inode = file_inode(file); 2418f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 24191e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2420c146afadSYan Zheng int ret; 2421c146afadSYan Zheng 242225122d15SIlya Dryomov ret = mnt_want_write_file(file); 242325122d15SIlya Dryomov if (ret) 242425122d15SIlya Dryomov return ret; 2425b83cc969SLi Zefan 242625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 242725122d15SIlya Dryomov ret = -EROFS; 242825122d15SIlya Dryomov goto out; 24295ac00addSStefan Behrens } 2430f46b5a66SChristoph Hellwig 2431f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2432f46b5a66SChristoph Hellwig case S_IFDIR: 2433e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2434e441d54dSChris Mason ret = -EPERM; 2435e441d54dSChris Mason goto out; 2436e441d54dSChris Mason } 2437de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 24388929ecfaSYan, Zheng if (ret) 24398929ecfaSYan, Zheng goto out; 2440de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2441f46b5a66SChristoph Hellwig break; 2442f46b5a66SChristoph Hellwig case S_IFREG: 2443e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2444e441d54dSChris Mason ret = -EINVAL; 2445e441d54dSChris Mason goto out; 2446e441d54dSChris Mason } 24471e701a32SChris Mason 24481e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 24491e701a32SChris Mason if (!range) { 24501e701a32SChris Mason ret = -ENOMEM; 24511e701a32SChris Mason goto out; 24521e701a32SChris Mason } 24531e701a32SChris Mason 24541e701a32SChris Mason if (argp) { 24551e701a32SChris Mason if (copy_from_user(range, argp, 24561e701a32SChris Mason sizeof(*range))) { 24571e701a32SChris Mason ret = -EFAULT; 24581e701a32SChris Mason kfree(range); 2459683be16eSDan Carpenter goto out; 24601e701a32SChris Mason } 24611e701a32SChris Mason /* compression requires us to start the IO */ 24621e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 24631e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 24641e701a32SChris Mason range->extent_thresh = (u32)-1; 24651e701a32SChris Mason } 24661e701a32SChris Mason } else { 24671e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 24681e701a32SChris Mason range->len = (u64)-1; 24691e701a32SChris Mason } 2470496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 24714cb5300bSChris Mason range, 0, 0); 24724cb5300bSChris Mason if (ret > 0) 24734cb5300bSChris Mason ret = 0; 24741e701a32SChris Mason kfree(range); 2475f46b5a66SChristoph Hellwig break; 24768929ecfaSYan, Zheng default: 24778929ecfaSYan, Zheng ret = -EINVAL; 2478f46b5a66SChristoph Hellwig } 2479e441d54dSChris Mason out: 248025122d15SIlya Dryomov mnt_drop_write_file(file); 2481e441d54dSChris Mason return ret; 2482f46b5a66SChristoph Hellwig } 2483f46b5a66SChristoph Hellwig 2484b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2485f46b5a66SChristoph Hellwig { 2486f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2487f46b5a66SChristoph Hellwig int ret; 2488f46b5a66SChristoph Hellwig 2489e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2490e441d54dSChris Mason return -EPERM; 2491e441d54dSChris Mason 24925ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 24935ac00addSStefan Behrens 1)) { 2494e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2495c9e9f97bSIlya Dryomov } 2496c9e9f97bSIlya Dryomov 24975ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2498dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2499c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2500c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2501c9e9f97bSIlya Dryomov goto out; 2502c9e9f97bSIlya Dryomov } 2503f46b5a66SChristoph Hellwig 25045516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2505f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2506f46b5a66SChristoph Hellwig 2507f46b5a66SChristoph Hellwig kfree(vol_args); 2508c9e9f97bSIlya Dryomov out: 2509c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 25105ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2511f46b5a66SChristoph Hellwig return ret; 2512f46b5a66SChristoph Hellwig } 2513f46b5a66SChristoph Hellwig 2514da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2515f46b5a66SChristoph Hellwig { 2516496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2517f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2518f46b5a66SChristoph Hellwig int ret; 2519f46b5a66SChristoph Hellwig 2520e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2521e441d54dSChris Mason return -EPERM; 2522e441d54dSChris Mason 2523da24927bSMiao Xie ret = mnt_want_write_file(file); 2524da24927bSMiao Xie if (ret) 2525da24927bSMiao Xie return ret; 2526c146afadSYan Zheng 2527dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2528c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2529c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2530c9e9f97bSIlya Dryomov goto out; 2531c9e9f97bSIlya Dryomov } 2532f46b5a66SChristoph Hellwig 25335516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2534f46b5a66SChristoph Hellwig 2535183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2536183860f6SAnand Jain 1)) { 2537183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2538183860f6SAnand Jain goto out; 2539183860f6SAnand Jain } 2540183860f6SAnand Jain 2541183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2542183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2543c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 25445ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2545183860f6SAnand Jain 2546183860f6SAnand Jain out: 2547183860f6SAnand Jain kfree(vol_args); 25484ac20c70SIlya Dryomov mnt_drop_write_file(file); 2549f46b5a66SChristoph Hellwig return ret; 2550f46b5a66SChristoph Hellwig } 2551f46b5a66SChristoph Hellwig 2552475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2553475f6387SJan Schmidt { 2554027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2555475f6387SJan Schmidt struct btrfs_device *device; 2556475f6387SJan Schmidt struct btrfs_device *next; 2557475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2558027ed2f0SLi Zefan int ret = 0; 2559475f6387SJan Schmidt 2560475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2561475f6387SJan Schmidt return -EPERM; 2562475f6387SJan Schmidt 2563027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2564027ed2f0SLi Zefan if (!fi_args) 2565027ed2f0SLi Zefan return -ENOMEM; 2566027ed2f0SLi Zefan 2567f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2568027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2569027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2570475f6387SJan Schmidt 2571475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2572027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2573027ed2f0SLi Zefan fi_args->max_id = device->devid; 2574475f6387SJan Schmidt } 2575475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2576475f6387SJan Schmidt 2577027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2578027ed2f0SLi Zefan ret = -EFAULT; 2579475f6387SJan Schmidt 2580027ed2f0SLi Zefan kfree(fi_args); 2581027ed2f0SLi Zefan return ret; 2582475f6387SJan Schmidt } 2583475f6387SJan Schmidt 2584475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2585475f6387SJan Schmidt { 2586475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2587475f6387SJan Schmidt struct btrfs_device *dev; 2588475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2589475f6387SJan Schmidt int ret = 0; 2590475f6387SJan Schmidt char *s_uuid = NULL; 2591475f6387SJan Schmidt 2592475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2593475f6387SJan Schmidt return -EPERM; 2594475f6387SJan Schmidt 2595475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2596475f6387SJan Schmidt if (IS_ERR(di_args)) 2597475f6387SJan Schmidt return PTR_ERR(di_args); 2598475f6387SJan Schmidt 2599dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2600475f6387SJan Schmidt s_uuid = di_args->uuid; 2601475f6387SJan Schmidt 2602475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2603aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2604475f6387SJan Schmidt 2605475f6387SJan Schmidt if (!dev) { 2606475f6387SJan Schmidt ret = -ENODEV; 2607475f6387SJan Schmidt goto out; 2608475f6387SJan Schmidt } 2609475f6387SJan Schmidt 2610475f6387SJan Schmidt di_args->devid = dev->devid; 2611475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2612475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2613475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2614a27202fbSJim Meyering if (dev->name) { 2615606686eeSJosef Bacik struct rcu_string *name; 2616606686eeSJosef Bacik 2617606686eeSJosef Bacik rcu_read_lock(); 2618606686eeSJosef Bacik name = rcu_dereference(dev->name); 2619606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2620606686eeSJosef Bacik rcu_read_unlock(); 2621a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2622a27202fbSJim Meyering } else { 262399ba55adSStefan Behrens di_args->path[0] = '\0'; 2624a27202fbSJim Meyering } 2625475f6387SJan Schmidt 2626475f6387SJan Schmidt out: 262755793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2628475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2629475f6387SJan Schmidt ret = -EFAULT; 2630475f6387SJan Schmidt 2631475f6387SJan Schmidt kfree(di_args); 2632475f6387SJan Schmidt return ret; 2633475f6387SJan Schmidt } 2634475f6387SJan Schmidt 2635416161dbSMark Fasheh static struct page *extent_same_get_page(struct inode *inode, u64 off) 2636416161dbSMark Fasheh { 2637416161dbSMark Fasheh struct page *page; 2638416161dbSMark Fasheh pgoff_t index; 2639416161dbSMark Fasheh struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; 2640416161dbSMark Fasheh 2641416161dbSMark Fasheh index = off >> PAGE_CACHE_SHIFT; 2642416161dbSMark Fasheh 2643416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2644416161dbSMark Fasheh if (!page) 2645416161dbSMark Fasheh return NULL; 2646416161dbSMark Fasheh 2647416161dbSMark Fasheh if (!PageUptodate(page)) { 2648416161dbSMark Fasheh if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, 2649416161dbSMark Fasheh 0)) 2650416161dbSMark Fasheh return NULL; 2651416161dbSMark Fasheh lock_page(page); 2652416161dbSMark Fasheh if (!PageUptodate(page)) { 2653416161dbSMark Fasheh unlock_page(page); 2654416161dbSMark Fasheh page_cache_release(page); 2655416161dbSMark Fasheh return NULL; 2656416161dbSMark Fasheh } 2657416161dbSMark Fasheh } 2658416161dbSMark Fasheh unlock_page(page); 2659416161dbSMark Fasheh 2660416161dbSMark Fasheh return page; 2661416161dbSMark Fasheh } 2662416161dbSMark Fasheh 266377fe20dcSMark Fasheh static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 266477fe20dcSMark Fasheh { 266577fe20dcSMark Fasheh /* do any pending delalloc/csum calc on src, one way or 266677fe20dcSMark Fasheh another, and lock file content */ 266777fe20dcSMark Fasheh while (1) { 266877fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 266977fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 267077fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 267177fe20dcSMark Fasheh off + len - 1); 267277fe20dcSMark Fasheh if (!ordered && 267377fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 267477fe20dcSMark Fasheh off + len - 1, EXTENT_DELALLOC, 0, NULL)) 267577fe20dcSMark Fasheh break; 267677fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 267777fe20dcSMark Fasheh if (ordered) 267877fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 267977fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 268077fe20dcSMark Fasheh } 268177fe20dcSMark Fasheh } 268277fe20dcSMark Fasheh 2683416161dbSMark Fasheh static void btrfs_double_unlock(struct inode *inode1, u64 loff1, 2684416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2685416161dbSMark Fasheh { 2686416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2687416161dbSMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2688416161dbSMark Fasheh 2689416161dbSMark Fasheh mutex_unlock(&inode1->i_mutex); 2690416161dbSMark Fasheh mutex_unlock(&inode2->i_mutex); 2691416161dbSMark Fasheh } 2692416161dbSMark Fasheh 2693416161dbSMark Fasheh static void btrfs_double_lock(struct inode *inode1, u64 loff1, 2694416161dbSMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2695416161dbSMark Fasheh { 2696416161dbSMark Fasheh if (inode1 < inode2) { 2697416161dbSMark Fasheh swap(inode1, inode2); 2698416161dbSMark Fasheh swap(loff1, loff2); 2699416161dbSMark Fasheh } 2700416161dbSMark Fasheh 2701416161dbSMark Fasheh mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 2702416161dbSMark Fasheh lock_extent_range(inode1, loff1, len); 2703416161dbSMark Fasheh if (inode1 != inode2) { 2704416161dbSMark Fasheh mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 2705416161dbSMark Fasheh lock_extent_range(inode2, loff2, len); 2706416161dbSMark Fasheh } 2707416161dbSMark Fasheh } 2708416161dbSMark Fasheh 2709416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2710416161dbSMark Fasheh u64 dst_loff, u64 len) 2711416161dbSMark Fasheh { 2712416161dbSMark Fasheh int ret = 0; 2713416161dbSMark Fasheh struct page *src_page, *dst_page; 2714416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2715416161dbSMark Fasheh void *addr, *dst_addr; 2716416161dbSMark Fasheh 2717416161dbSMark Fasheh while (len) { 2718416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2719416161dbSMark Fasheh cmp_len = len; 2720416161dbSMark Fasheh 2721416161dbSMark Fasheh src_page = extent_same_get_page(src, loff); 2722416161dbSMark Fasheh if (!src_page) 2723416161dbSMark Fasheh return -EINVAL; 2724416161dbSMark Fasheh dst_page = extent_same_get_page(dst, dst_loff); 2725416161dbSMark Fasheh if (!dst_page) { 2726416161dbSMark Fasheh page_cache_release(src_page); 2727416161dbSMark Fasheh return -EINVAL; 2728416161dbSMark Fasheh } 2729416161dbSMark Fasheh addr = kmap_atomic(src_page); 2730416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 2731416161dbSMark Fasheh 2732416161dbSMark Fasheh flush_dcache_page(src_page); 2733416161dbSMark Fasheh flush_dcache_page(dst_page); 2734416161dbSMark Fasheh 2735416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 2736416161dbSMark Fasheh ret = BTRFS_SAME_DATA_DIFFERS; 2737416161dbSMark Fasheh 2738416161dbSMark Fasheh kunmap_atomic(addr); 2739416161dbSMark Fasheh kunmap_atomic(dst_addr); 2740416161dbSMark Fasheh page_cache_release(src_page); 2741416161dbSMark Fasheh page_cache_release(dst_page); 2742416161dbSMark Fasheh 2743416161dbSMark Fasheh if (ret) 2744416161dbSMark Fasheh break; 2745416161dbSMark Fasheh 2746416161dbSMark Fasheh loff += cmp_len; 2747416161dbSMark Fasheh dst_loff += cmp_len; 2748416161dbSMark Fasheh len -= cmp_len; 2749416161dbSMark Fasheh } 2750416161dbSMark Fasheh 2751416161dbSMark Fasheh return ret; 2752416161dbSMark Fasheh } 2753416161dbSMark Fasheh 2754416161dbSMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) 2755416161dbSMark Fasheh { 2756416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 2757416161dbSMark Fasheh 2758416161dbSMark Fasheh if (off + len > inode->i_size || off + len < off) 2759416161dbSMark Fasheh return -EINVAL; 2760416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 2761416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 2762416161dbSMark Fasheh return -EINVAL; 2763416161dbSMark Fasheh 2764416161dbSMark Fasheh return 0; 2765416161dbSMark Fasheh } 2766416161dbSMark Fasheh 2767416161dbSMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, 2768416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 2769416161dbSMark Fasheh { 2770416161dbSMark Fasheh int ret; 2771416161dbSMark Fasheh 2772416161dbSMark Fasheh /* 2773416161dbSMark Fasheh * btrfs_clone() can't handle extents in the same file 2774416161dbSMark Fasheh * yet. Once that works, we can drop this check and replace it 2775416161dbSMark Fasheh * with a check for the same inode, but overlapping extents. 2776416161dbSMark Fasheh */ 2777416161dbSMark Fasheh if (src == dst) 2778416161dbSMark Fasheh return -EINVAL; 2779416161dbSMark Fasheh 2780416161dbSMark Fasheh btrfs_double_lock(src, loff, dst, dst_loff, len); 2781416161dbSMark Fasheh 2782416161dbSMark Fasheh ret = extent_same_check_offsets(src, loff, len); 2783416161dbSMark Fasheh if (ret) 2784416161dbSMark Fasheh goto out_unlock; 2785416161dbSMark Fasheh 2786416161dbSMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, len); 2787416161dbSMark Fasheh if (ret) 2788416161dbSMark Fasheh goto out_unlock; 2789416161dbSMark Fasheh 2790416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 2791416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 2792416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 2793416161dbSMark Fasheh ret = -EINVAL; 2794416161dbSMark Fasheh goto out_unlock; 2795416161dbSMark Fasheh } 2796416161dbSMark Fasheh 2797416161dbSMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); 2798416161dbSMark Fasheh if (ret == 0) 2799416161dbSMark Fasheh ret = btrfs_clone(src, dst, loff, len, len, dst_loff); 2800416161dbSMark Fasheh 2801416161dbSMark Fasheh out_unlock: 2802416161dbSMark Fasheh btrfs_double_unlock(src, loff, dst, dst_loff, len); 2803416161dbSMark Fasheh 2804416161dbSMark Fasheh return ret; 2805416161dbSMark Fasheh } 2806416161dbSMark Fasheh 2807416161dbSMark Fasheh #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) 2808416161dbSMark Fasheh 2809416161dbSMark Fasheh static long btrfs_ioctl_file_extent_same(struct file *file, 2810416161dbSMark Fasheh void __user *argp) 2811416161dbSMark Fasheh { 2812cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args tmp; 2813cbf8b8caSMark Fasheh struct btrfs_ioctl_same_args *same; 2814cbf8b8caSMark Fasheh struct btrfs_ioctl_same_extent_info *info; 2815416161dbSMark Fasheh struct inode *src = file->f_dentry->d_inode; 2816416161dbSMark Fasheh struct file *dst_file = NULL; 2817416161dbSMark Fasheh struct inode *dst; 2818416161dbSMark Fasheh u64 off; 2819416161dbSMark Fasheh u64 len; 2820416161dbSMark Fasheh int i; 2821416161dbSMark Fasheh int ret; 2822cbf8b8caSMark Fasheh unsigned long size; 2823416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 2824416161dbSMark Fasheh bool is_admin = capable(CAP_SYS_ADMIN); 2825416161dbSMark Fasheh 2826416161dbSMark Fasheh if (!(file->f_mode & FMODE_READ)) 2827416161dbSMark Fasheh return -EINVAL; 2828416161dbSMark Fasheh 2829416161dbSMark Fasheh ret = mnt_want_write_file(file); 2830416161dbSMark Fasheh if (ret) 2831416161dbSMark Fasheh return ret; 2832416161dbSMark Fasheh 2833cbf8b8caSMark Fasheh if (copy_from_user(&tmp, 2834416161dbSMark Fasheh (struct btrfs_ioctl_same_args __user *)argp, 2835cbf8b8caSMark Fasheh sizeof(tmp))) { 2836416161dbSMark Fasheh ret = -EFAULT; 2837416161dbSMark Fasheh goto out; 2838416161dbSMark Fasheh } 2839416161dbSMark Fasheh 2840cbf8b8caSMark Fasheh size = sizeof(tmp) + 2841cbf8b8caSMark Fasheh tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); 2842cbf8b8caSMark Fasheh 2843229eed43SGeyslan G. Bem same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); 2844cbf8b8caSMark Fasheh 2845229eed43SGeyslan G. Bem if (IS_ERR(same)) { 2846229eed43SGeyslan G. Bem ret = PTR_ERR(same); 2847cbf8b8caSMark Fasheh goto out; 2848cbf8b8caSMark Fasheh } 2849cbf8b8caSMark Fasheh 2850cbf8b8caSMark Fasheh off = same->logical_offset; 2851cbf8b8caSMark Fasheh len = same->length; 2852416161dbSMark Fasheh 2853416161dbSMark Fasheh /* 2854416161dbSMark Fasheh * Limit the total length we will dedupe for each operation. 2855416161dbSMark Fasheh * This is intended to bound the total time spent in this 2856416161dbSMark Fasheh * ioctl to something sane. 2857416161dbSMark Fasheh */ 2858416161dbSMark Fasheh if (len > BTRFS_MAX_DEDUPE_LEN) 2859416161dbSMark Fasheh len = BTRFS_MAX_DEDUPE_LEN; 2860416161dbSMark Fasheh 2861416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 2862416161dbSMark Fasheh /* 2863416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 2864416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 2865416161dbSMark Fasheh * this situation without an update. 2866416161dbSMark Fasheh */ 2867416161dbSMark Fasheh ret = -EINVAL; 2868416161dbSMark Fasheh goto out; 2869416161dbSMark Fasheh } 2870416161dbSMark Fasheh 2871416161dbSMark Fasheh ret = -EISDIR; 2872416161dbSMark Fasheh if (S_ISDIR(src->i_mode)) 2873416161dbSMark Fasheh goto out; 2874416161dbSMark Fasheh 2875416161dbSMark Fasheh ret = -EACCES; 2876416161dbSMark Fasheh if (!S_ISREG(src->i_mode)) 2877416161dbSMark Fasheh goto out; 2878416161dbSMark Fasheh 2879cbf8b8caSMark Fasheh /* pre-format output fields to sane values */ 2880cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2881cbf8b8caSMark Fasheh same->info[i].bytes_deduped = 0ULL; 2882cbf8b8caSMark Fasheh same->info[i].status = 0; 2883416161dbSMark Fasheh } 2884416161dbSMark Fasheh 2885cbf8b8caSMark Fasheh ret = 0; 2886cbf8b8caSMark Fasheh for (i = 0; i < same->dest_count; i++) { 2887cbf8b8caSMark Fasheh info = &same->info[i]; 2888416161dbSMark Fasheh 2889cbf8b8caSMark Fasheh dst_file = fget(info->fd); 2890416161dbSMark Fasheh if (!dst_file) { 2891cbf8b8caSMark Fasheh info->status = -EBADF; 2892416161dbSMark Fasheh goto next; 2893416161dbSMark Fasheh } 2894416161dbSMark Fasheh 2895416161dbSMark Fasheh if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { 2896cbf8b8caSMark Fasheh info->status = -EINVAL; 2897416161dbSMark Fasheh goto next; 2898416161dbSMark Fasheh } 2899416161dbSMark Fasheh 2900cbf8b8caSMark Fasheh info->status = -EXDEV; 2901416161dbSMark Fasheh if (file->f_path.mnt != dst_file->f_path.mnt) 2902416161dbSMark Fasheh goto next; 2903416161dbSMark Fasheh 2904416161dbSMark Fasheh dst = dst_file->f_dentry->d_inode; 2905416161dbSMark Fasheh if (src->i_sb != dst->i_sb) 2906416161dbSMark Fasheh goto next; 2907416161dbSMark Fasheh 2908416161dbSMark Fasheh if (S_ISDIR(dst->i_mode)) { 2909cbf8b8caSMark Fasheh info->status = -EISDIR; 2910416161dbSMark Fasheh goto next; 2911416161dbSMark Fasheh } 2912416161dbSMark Fasheh 2913416161dbSMark Fasheh if (!S_ISREG(dst->i_mode)) { 2914cbf8b8caSMark Fasheh info->status = -EACCES; 2915416161dbSMark Fasheh goto next; 2916416161dbSMark Fasheh } 2917416161dbSMark Fasheh 2918cbf8b8caSMark Fasheh info->status = btrfs_extent_same(src, off, len, dst, 2919cbf8b8caSMark Fasheh info->logical_offset); 2920cbf8b8caSMark Fasheh if (info->status == 0) 2921cbf8b8caSMark Fasheh info->bytes_deduped += len; 2922416161dbSMark Fasheh 2923416161dbSMark Fasheh next: 2924416161dbSMark Fasheh if (dst_file) 2925416161dbSMark Fasheh fput(dst_file); 2926cbf8b8caSMark Fasheh } 2927416161dbSMark Fasheh 2928cbf8b8caSMark Fasheh ret = copy_to_user(argp, same, size); 2929cbf8b8caSMark Fasheh if (ret) 2930416161dbSMark Fasheh ret = -EFAULT; 2931416161dbSMark Fasheh 2932416161dbSMark Fasheh out: 2933416161dbSMark Fasheh mnt_drop_write_file(file); 2934416161dbSMark Fasheh return ret; 2935416161dbSMark Fasheh } 2936416161dbSMark Fasheh 293732b7c687SMark Fasheh /** 293832b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 293932b7c687SMark Fasheh * 294032b7c687SMark Fasheh * @src: Inode to clone from 294132b7c687SMark Fasheh * @inode: Inode to clone to 294232b7c687SMark Fasheh * @off: Offset within source to start clone from 294332b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 294432b7c687SMark Fasheh * @olen_aligned: Block-aligned value of olen, extent_same uses 294532b7c687SMark Fasheh * identical values here 294632b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 294732b7c687SMark Fasheh */ 294832b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 294932b7c687SMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff) 2950f46b5a66SChristoph Hellwig { 2951f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 295232b7c687SMark Fasheh struct btrfs_path *path = NULL; 2953f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 295432b7c687SMark Fasheh struct btrfs_trans_handle *trans; 295532b7c687SMark Fasheh char *buf = NULL; 2956ae01a0abSYan Zheng struct btrfs_key key; 2957f46b5a66SChristoph Hellwig u32 nritems; 2958f46b5a66SChristoph Hellwig int slot; 2959ae01a0abSYan Zheng int ret; 296032b7c687SMark Fasheh u64 len = olen_aligned; 2961ae01a0abSYan Zheng 2962ae01a0abSYan Zheng ret = -ENOMEM; 2963ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2964ae01a0abSYan Zheng if (!buf) 296532b7c687SMark Fasheh return ret; 2966ae01a0abSYan Zheng 2967ae01a0abSYan Zheng path = btrfs_alloc_path(); 2968ae01a0abSYan Zheng if (!path) { 2969ae01a0abSYan Zheng vfree(buf); 297032b7c687SMark Fasheh return ret; 2971ae01a0abSYan Zheng } 297232b7c687SMark Fasheh 2973ae01a0abSYan Zheng path->reada = 2; 2974c5c9cd4dSSage Weil /* clone data */ 297533345d01SLi Zefan key.objectid = btrfs_ino(src); 2976ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2977ae01a0abSYan Zheng key.offset = 0; 2978f46b5a66SChristoph Hellwig 2979f46b5a66SChristoph Hellwig while (1) { 2980f46b5a66SChristoph Hellwig /* 2981f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2982f46b5a66SChristoph Hellwig * tree. 2983f46b5a66SChristoph Hellwig */ 2984e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 2985362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2986362a20c5SDavid Sterba 0, 0); 2987f46b5a66SChristoph Hellwig if (ret < 0) 2988f46b5a66SChristoph Hellwig goto out; 2989f46b5a66SChristoph Hellwig 2990ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2991e4355f34SFilipe David Borba Manana process_slot: 2992ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2993362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2994f46b5a66SChristoph Hellwig if (ret < 0) 2995f46b5a66SChristoph Hellwig goto out; 2996f46b5a66SChristoph Hellwig if (ret > 0) 2997f46b5a66SChristoph Hellwig break; 2998ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2999f46b5a66SChristoph Hellwig } 3000f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3001f46b5a66SChristoph Hellwig slot = path->slots[0]; 3002f46b5a66SChristoph Hellwig 3003ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3004d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 300533345d01SLi Zefan key.objectid != btrfs_ino(src)) 3006f46b5a66SChristoph Hellwig break; 3007f46b5a66SChristoph Hellwig 3008c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 3009c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3010c5c9cd4dSSage Weil int type; 301131840ae1SZheng Yan u32 size; 301231840ae1SZheng Yan struct btrfs_key new_key; 3013c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3014c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3015c5c9cd4dSSage Weil u8 comp; 3016b5384d48SSage Weil u64 endoff; 301731840ae1SZheng Yan 3018c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3019c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3020c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3021c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3022c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3023c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3024d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3025d397712bSChris Mason extent); 3026d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3027d397712bSChris Mason extent); 3028c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3029d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3030d397712bSChris Mason extent); 3031c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3032c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3033c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3034c5c9cd4dSSage Weil extent); 3035c5c9cd4dSSage Weil } 303631840ae1SZheng Yan 3037050006a7SSage Weil if (key.offset + datal <= off || 3038e4355f34SFilipe David Borba Manana key.offset >= off + len - 1) { 3039e4355f34SFilipe David Borba Manana path->slots[0]++; 3040e4355f34SFilipe David Borba Manana goto process_slot; 3041e4355f34SFilipe David Borba Manana } 3042e4355f34SFilipe David Borba Manana 3043e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3044e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3045e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3046e4355f34SFilipe David Borba Manana size); 3047e4355f34SFilipe David Borba Manana 3048e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3049e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3050c5c9cd4dSSage Weil 305131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 305233345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 30534d728ec7SLi Zefan if (off <= key.offset) 3054c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 30554d728ec7SLi Zefan else 30564d728ec7SLi Zefan new_key.offset = destoff; 3057c5c9cd4dSSage Weil 3058b6f3409bSSage Weil /* 3059b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3060b6f3409bSSage Weil * 1 - add new extent 3061b6f3409bSSage Weil * 1 - inode update 3062b6f3409bSSage Weil */ 3063b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3064a22285a6SYan, Zheng if (IS_ERR(trans)) { 3065a22285a6SYan, Zheng ret = PTR_ERR(trans); 3066a22285a6SYan, Zheng goto out; 3067a22285a6SYan, Zheng } 3068a22285a6SYan, Zheng 3069c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3070c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3071d72c0842SLi Zefan /* 3072d72c0842SLi Zefan * a | --- range to clone ---| b 3073d72c0842SLi Zefan * | ------------- extent ------------- | 3074d72c0842SLi Zefan */ 3075d72c0842SLi Zefan 3076d72c0842SLi Zefan /* substract range b */ 3077d72c0842SLi Zefan if (key.offset + datal > off + len) 3078d72c0842SLi Zefan datal = off + len - key.offset; 3079d72c0842SLi Zefan 3080d72c0842SLi Zefan /* substract range a */ 3081a22285a6SYan, Zheng if (off > key.offset) { 3082a22285a6SYan, Zheng datao += off - key.offset; 3083a22285a6SYan, Zheng datal -= off - key.offset; 3084a22285a6SYan, Zheng } 3085a22285a6SYan, Zheng 30865dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3087a22285a6SYan, Zheng new_key.offset, 3088a22285a6SYan, Zheng new_key.offset + datal, 30892671485dSJosef Bacik 1); 309079787eaaSJeff Mahoney if (ret) { 309100fdf13aSLiu Bo if (ret != -EINVAL) 309200fdf13aSLiu Bo btrfs_abort_transaction(trans, 309300fdf13aSLiu Bo root, ret); 309479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 309579787eaaSJeff Mahoney goto out; 309679787eaaSJeff Mahoney } 3097a22285a6SYan, Zheng 309831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 309931840ae1SZheng Yan &new_key, size); 310079787eaaSJeff Mahoney if (ret) { 310179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 310279787eaaSJeff Mahoney ret); 310379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 310479787eaaSJeff Mahoney goto out; 310579787eaaSJeff Mahoney } 310631840ae1SZheng Yan 310731840ae1SZheng Yan leaf = path->nodes[0]; 310831840ae1SZheng Yan slot = path->slots[0]; 310931840ae1SZheng Yan write_extent_buffer(leaf, buf, 311031840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 311131840ae1SZheng Yan size); 3112ae01a0abSYan Zheng 3113f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3114f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3115c5c9cd4dSSage Weil 3116c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3117c5c9cd4dSSage Weil if (!disko) 3118c5c9cd4dSSage Weil datao = 0; 3119c5c9cd4dSSage Weil 3120c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3121c5c9cd4dSSage Weil datao); 3122c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3123c5c9cd4dSSage Weil datal); 3124c5c9cd4dSSage Weil if (disko) { 3125c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3126ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 31275d4f98a2SYan Zheng disko, diskl, 0, 3128f46b5a66SChristoph Hellwig root->root_key.objectid, 312933345d01SLi Zefan btrfs_ino(inode), 313066d7e7f0SArne Jansen new_key.offset - datao, 313166d7e7f0SArne Jansen 0); 313279787eaaSJeff Mahoney if (ret) { 313379787eaaSJeff Mahoney btrfs_abort_transaction(trans, 313479787eaaSJeff Mahoney root, 313579787eaaSJeff Mahoney ret); 313679787eaaSJeff Mahoney btrfs_end_transaction(trans, 313779787eaaSJeff Mahoney root); 313879787eaaSJeff Mahoney goto out; 313979787eaaSJeff Mahoney 314079787eaaSJeff Mahoney } 3141f46b5a66SChristoph Hellwig } 3142c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3143c5c9cd4dSSage Weil u64 skip = 0; 3144c5c9cd4dSSage Weil u64 trim = 0; 3145c5c9cd4dSSage Weil if (off > key.offset) { 3146c5c9cd4dSSage Weil skip = off - key.offset; 3147c5c9cd4dSSage Weil new_key.offset += skip; 314831840ae1SZheng Yan } 3149d397712bSChris Mason 3150c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3151c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3152d397712bSChris Mason 3153c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3154c5c9cd4dSSage Weil ret = -EINVAL; 3155a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3156c5c9cd4dSSage Weil goto out; 315731840ae1SZheng Yan } 3158c5c9cd4dSSage Weil size -= skip + trim; 3159c5c9cd4dSSage Weil datal -= skip + trim; 3160a22285a6SYan, Zheng 31615dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3162a22285a6SYan, Zheng new_key.offset, 3163a22285a6SYan, Zheng new_key.offset + datal, 31642671485dSJosef Bacik 1); 316579787eaaSJeff Mahoney if (ret) { 316679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 316779787eaaSJeff Mahoney ret); 316879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 316979787eaaSJeff Mahoney goto out; 317079787eaaSJeff Mahoney } 3171a22285a6SYan, Zheng 3172c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 3173c5c9cd4dSSage Weil &new_key, size); 317479787eaaSJeff Mahoney if (ret) { 317579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 317679787eaaSJeff Mahoney ret); 317779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 317879787eaaSJeff Mahoney goto out; 317979787eaaSJeff Mahoney } 3180c5c9cd4dSSage Weil 3181c5c9cd4dSSage Weil if (skip) { 3182d397712bSChris Mason u32 start = 3183d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 3184c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 3185c5c9cd4dSSage Weil datal); 3186c5c9cd4dSSage Weil } 3187c5c9cd4dSSage Weil 3188c5c9cd4dSSage Weil leaf = path->nodes[0]; 3189c5c9cd4dSSage Weil slot = path->slots[0]; 3190c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 3191c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 3192c5c9cd4dSSage Weil size); 3193c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3194c5c9cd4dSSage Weil } 3195c5c9cd4dSSage Weil 3196c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3197b3b4aa74SDavid Sterba btrfs_release_path(path); 3198c5c9cd4dSSage Weil 31990c4d2d95SJosef Bacik inode_inc_iversion(inode); 3200a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3201b5384d48SSage Weil 3202b5384d48SSage Weil /* 3203b5384d48SSage Weil * we round up to the block size at eof when 3204b5384d48SSage Weil * determining which extents to clone above, 3205b5384d48SSage Weil * but shouldn't round up the file size 3206b5384d48SSage Weil */ 3207b5384d48SSage Weil endoff = new_key.offset + datal; 32085f3888ffSLi Zefan if (endoff > destoff+olen) 32095f3888ffSLi Zefan endoff = destoff+olen; 3210b5384d48SSage Weil if (endoff > inode->i_size) 3211b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 3212b5384d48SSage Weil 3213a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 321479787eaaSJeff Mahoney if (ret) { 321579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 3216a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 321779787eaaSJeff Mahoney goto out; 321879787eaaSJeff Mahoney } 321979787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 3220a22285a6SYan, Zheng } 3221b3b4aa74SDavid Sterba btrfs_release_path(path); 3222ae01a0abSYan Zheng key.offset++; 3223ae01a0abSYan Zheng } 3224f46b5a66SChristoph Hellwig ret = 0; 322532b7c687SMark Fasheh 3226f46b5a66SChristoph Hellwig out: 3227b3b4aa74SDavid Sterba btrfs_release_path(path); 322832b7c687SMark Fasheh btrfs_free_path(path); 322932b7c687SMark Fasheh vfree(buf); 323032b7c687SMark Fasheh return ret; 323132b7c687SMark Fasheh } 323232b7c687SMark Fasheh 323332b7c687SMark Fasheh static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 323432b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 323532b7c687SMark Fasheh { 323654563d41SAl Viro struct inode *inode = file_inode(file); 323732b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 323832b7c687SMark Fasheh struct fd src_file; 323932b7c687SMark Fasheh struct inode *src; 324032b7c687SMark Fasheh int ret; 324132b7c687SMark Fasheh u64 len = olen; 324232b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 324332b7c687SMark Fasheh int same_inode = 0; 324432b7c687SMark Fasheh 324532b7c687SMark Fasheh /* 324632b7c687SMark Fasheh * TODO: 324732b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 324832b7c687SMark Fasheh * decompress into destination's address_space (the file offset 324932b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 325032b7c687SMark Fasheh * otherwise reinsert) a subrange. 325100fdf13aSLiu Bo * 325200fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 325300fdf13aSLiu Bo * be either compressed or non-compressed. 325432b7c687SMark Fasheh */ 325532b7c687SMark Fasheh 325632b7c687SMark Fasheh /* the destination must be opened for writing */ 325732b7c687SMark Fasheh if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 325832b7c687SMark Fasheh return -EINVAL; 325932b7c687SMark Fasheh 326032b7c687SMark Fasheh if (btrfs_root_readonly(root)) 326132b7c687SMark Fasheh return -EROFS; 326232b7c687SMark Fasheh 326332b7c687SMark Fasheh ret = mnt_want_write_file(file); 326432b7c687SMark Fasheh if (ret) 326532b7c687SMark Fasheh return ret; 326632b7c687SMark Fasheh 326732b7c687SMark Fasheh src_file = fdget(srcfd); 326832b7c687SMark Fasheh if (!src_file.file) { 326932b7c687SMark Fasheh ret = -EBADF; 327032b7c687SMark Fasheh goto out_drop_write; 327132b7c687SMark Fasheh } 327232b7c687SMark Fasheh 327332b7c687SMark Fasheh ret = -EXDEV; 327432b7c687SMark Fasheh if (src_file.file->f_path.mnt != file->f_path.mnt) 327532b7c687SMark Fasheh goto out_fput; 327632b7c687SMark Fasheh 327732b7c687SMark Fasheh src = file_inode(src_file.file); 327832b7c687SMark Fasheh 327932b7c687SMark Fasheh ret = -EINVAL; 328032b7c687SMark Fasheh if (src == inode) 328132b7c687SMark Fasheh same_inode = 1; 328232b7c687SMark Fasheh 328332b7c687SMark Fasheh /* the src must be open for reading */ 328432b7c687SMark Fasheh if (!(src_file.file->f_mode & FMODE_READ)) 328532b7c687SMark Fasheh goto out_fput; 328632b7c687SMark Fasheh 328732b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 328832b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 328932b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 329032b7c687SMark Fasheh goto out_fput; 329132b7c687SMark Fasheh 329232b7c687SMark Fasheh ret = -EISDIR; 329332b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 329432b7c687SMark Fasheh goto out_fput; 329532b7c687SMark Fasheh 329632b7c687SMark Fasheh ret = -EXDEV; 329732b7c687SMark Fasheh if (src->i_sb != inode->i_sb) 329832b7c687SMark Fasheh goto out_fput; 329932b7c687SMark Fasheh 330032b7c687SMark Fasheh if (!same_inode) { 330132b7c687SMark Fasheh if (inode < src) { 330232b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 330332b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 330432b7c687SMark Fasheh } else { 330532b7c687SMark Fasheh mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 330632b7c687SMark Fasheh mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 330732b7c687SMark Fasheh } 330832b7c687SMark Fasheh } else { 330932b7c687SMark Fasheh mutex_lock(&src->i_mutex); 331032b7c687SMark Fasheh } 331132b7c687SMark Fasheh 331232b7c687SMark Fasheh /* determine range to clone */ 331332b7c687SMark Fasheh ret = -EINVAL; 331432b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 331532b7c687SMark Fasheh goto out_unlock; 331632b7c687SMark Fasheh if (len == 0) 331732b7c687SMark Fasheh olen = len = src->i_size - off; 331832b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 331932b7c687SMark Fasheh if (off + len == src->i_size) 332032b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 332132b7c687SMark Fasheh 332232b7c687SMark Fasheh /* verify the end result is block aligned */ 332332b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 332432b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 332532b7c687SMark Fasheh goto out_unlock; 332632b7c687SMark Fasheh 332732b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 332832b7c687SMark Fasheh if (same_inode) { 332932b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 333032b7c687SMark Fasheh goto out_unlock; 333132b7c687SMark Fasheh } 333232b7c687SMark Fasheh 333332b7c687SMark Fasheh if (destoff > inode->i_size) { 333432b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 333532b7c687SMark Fasheh if (ret) 333632b7c687SMark Fasheh goto out_unlock; 333732b7c687SMark Fasheh } 333832b7c687SMark Fasheh 333932b7c687SMark Fasheh /* truncate page cache pages from target inode range */ 334032b7c687SMark Fasheh truncate_inode_pages_range(&inode->i_data, destoff, 334132b7c687SMark Fasheh PAGE_CACHE_ALIGN(destoff + len) - 1); 334232b7c687SMark Fasheh 334332b7c687SMark Fasheh lock_extent_range(src, off, len); 334432b7c687SMark Fasheh 334532b7c687SMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff); 334632b7c687SMark Fasheh 3347aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 3348f46b5a66SChristoph Hellwig out_unlock: 3349c57c2b3eSFilipe David Borba Manana if (!same_inode) { 3350c57c2b3eSFilipe David Borba Manana if (inode < src) { 3351f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 3352f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 3353c57c2b3eSFilipe David Borba Manana } else { 3354c57c2b3eSFilipe David Borba Manana mutex_unlock(&inode->i_mutex); 3355c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3356c57c2b3eSFilipe David Borba Manana } 3357c57c2b3eSFilipe David Borba Manana } else { 3358c57c2b3eSFilipe David Borba Manana mutex_unlock(&src->i_mutex); 3359c57c2b3eSFilipe David Borba Manana } 3360f46b5a66SChristoph Hellwig out_fput: 33612903ff01SAl Viro fdput(src_file); 3362ab67b7c1SYan Zheng out_drop_write: 33632a79f17eSAl Viro mnt_drop_write_file(file); 3364f46b5a66SChristoph Hellwig return ret; 3365f46b5a66SChristoph Hellwig } 3366f46b5a66SChristoph Hellwig 33677a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 3368c5c9cd4dSSage Weil { 3369c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 3370c5c9cd4dSSage Weil 33717a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 3372c5c9cd4dSSage Weil return -EFAULT; 3373c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 3374c5c9cd4dSSage Weil args.src_length, args.dest_offset); 3375c5c9cd4dSSage Weil } 3376c5c9cd4dSSage Weil 3377f46b5a66SChristoph Hellwig /* 3378f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3379f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3380f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3381f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3382f46b5a66SChristoph Hellwig */ 3383b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3384f46b5a66SChristoph Hellwig { 3385496ad9aaSAl Viro struct inode *inode = file_inode(file); 3386f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3387f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 33881ab86aedSSage Weil int ret; 3389f46b5a66SChristoph Hellwig 33901ab86aedSSage Weil ret = -EPERM; 3391df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3392f46b5a66SChristoph Hellwig goto out; 33931ab86aedSSage Weil 33941ab86aedSSage Weil ret = -EINPROGRESS; 33951ab86aedSSage Weil if (file->private_data) 33961ab86aedSSage Weil goto out; 33979ca9ee09SSage Weil 3398b83cc969SLi Zefan ret = -EROFS; 3399b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3400b83cc969SLi Zefan goto out; 3401b83cc969SLi Zefan 3402a561be71SAl Viro ret = mnt_want_write_file(file); 3403c146afadSYan Zheng if (ret) 3404c146afadSYan Zheng goto out; 3405c146afadSYan Zheng 3406a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 34079ca9ee09SSage Weil 3408f46b5a66SChristoph Hellwig ret = -ENOMEM; 34097a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3410abd30bb0STsutomu Itoh if (IS_ERR(trans)) 34111ab86aedSSage Weil goto out_drop; 34121ab86aedSSage Weil 34131ab86aedSSage Weil file->private_data = trans; 34141ab86aedSSage Weil return 0; 34151ab86aedSSage Weil 34161ab86aedSSage Weil out_drop: 3417a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 34182a79f17eSAl Viro mnt_drop_write_file(file); 3419f46b5a66SChristoph Hellwig out: 3420f46b5a66SChristoph Hellwig return ret; 3421f46b5a66SChristoph Hellwig } 3422f46b5a66SChristoph Hellwig 34236ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34246ef5ed0dSJosef Bacik { 3425496ad9aaSAl Viro struct inode *inode = file_inode(file); 34266ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34276ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34286ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34296ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34306ef5ed0dSJosef Bacik struct btrfs_path *path; 34316ef5ed0dSJosef Bacik struct btrfs_key location; 34326ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34336ef5ed0dSJosef Bacik u64 objectid = 0; 34346ef5ed0dSJosef Bacik u64 dir_id; 34353c04ce01SMiao Xie int ret; 34366ef5ed0dSJosef Bacik 34376ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34386ef5ed0dSJosef Bacik return -EPERM; 34396ef5ed0dSJosef Bacik 34403c04ce01SMiao Xie ret = mnt_want_write_file(file); 34413c04ce01SMiao Xie if (ret) 34423c04ce01SMiao Xie return ret; 34433c04ce01SMiao Xie 34443c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34453c04ce01SMiao Xie ret = -EFAULT; 34463c04ce01SMiao Xie goto out; 34473c04ce01SMiao Xie } 34486ef5ed0dSJosef Bacik 34496ef5ed0dSJosef Bacik if (!objectid) 34501cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34516ef5ed0dSJosef Bacik 34526ef5ed0dSJosef Bacik location.objectid = objectid; 34536ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 34546ef5ed0dSJosef Bacik location.offset = (u64)-1; 34556ef5ed0dSJosef Bacik 34566ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 34573c04ce01SMiao Xie if (IS_ERR(new_root)) { 34583c04ce01SMiao Xie ret = PTR_ERR(new_root); 34593c04ce01SMiao Xie goto out; 34603c04ce01SMiao Xie } 34616ef5ed0dSJosef Bacik 34626ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34633c04ce01SMiao Xie if (!path) { 34643c04ce01SMiao Xie ret = -ENOMEM; 34653c04ce01SMiao Xie goto out; 34663c04ce01SMiao Xie } 34676ef5ed0dSJosef Bacik path->leave_spinning = 1; 34686ef5ed0dSJosef Bacik 34696ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 347098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34716ef5ed0dSJosef Bacik btrfs_free_path(path); 34723c04ce01SMiao Xie ret = PTR_ERR(trans); 34733c04ce01SMiao Xie goto out; 34746ef5ed0dSJosef Bacik } 34756ef5ed0dSJosef Bacik 34766c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 34776ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 34786ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3479cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34806ef5ed0dSJosef Bacik btrfs_free_path(path); 34816ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 3482efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 3483efe120a0SFrank Holton "item, this isn't going to work"); 34843c04ce01SMiao Xie ret = -ENOENT; 34853c04ce01SMiao Xie goto out; 34866ef5ed0dSJosef Bacik } 34876ef5ed0dSJosef Bacik 34886ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34896ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34906ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34916ef5ed0dSJosef Bacik btrfs_free_path(path); 34926ef5ed0dSJosef Bacik 34932b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 34946ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 34953c04ce01SMiao Xie out: 34963c04ce01SMiao Xie mnt_drop_write_file(file); 34973c04ce01SMiao Xie return ret; 34986ef5ed0dSJosef Bacik } 34996ef5ed0dSJosef Bacik 35005af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 3501bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3502bf5fc093SJosef Bacik { 3503bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 3504bf5fc093SJosef Bacik 3505bf5fc093SJosef Bacik space->total_bytes = 0; 3506bf5fc093SJosef Bacik space->used_bytes = 0; 3507bf5fc093SJosef Bacik space->flags = 0; 3508bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3509bf5fc093SJosef Bacik space->flags = block_group->flags; 3510bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 3511bf5fc093SJosef Bacik space->used_bytes += 3512bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 3513bf5fc093SJosef Bacik } 3514bf5fc093SJosef Bacik } 3515bf5fc093SJosef Bacik 351648a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 35171406e432SJosef Bacik { 35181406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35191406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35201406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35217fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 352213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35231406e432SJosef Bacik struct btrfs_space_info *info; 3524bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 3525bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3526bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3527bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 3528bf5fc093SJosef Bacik int num_types = 4; 35297fde62bfSChris Mason int alloc_size; 35301406e432SJosef Bacik int ret = 0; 353151788b1bSDan Rosenberg u64 slot_count = 0; 3532bf5fc093SJosef Bacik int i, c; 35331406e432SJosef Bacik 35341406e432SJosef Bacik if (copy_from_user(&space_args, 35351406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35361406e432SJosef Bacik sizeof(space_args))) 35371406e432SJosef Bacik return -EFAULT; 35381406e432SJosef Bacik 3539bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3540bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3541bf5fc093SJosef Bacik 3542bf5fc093SJosef Bacik info = NULL; 35437fde62bfSChris Mason rcu_read_lock(); 3544bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3545bf5fc093SJosef Bacik list) { 3546bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3547bf5fc093SJosef Bacik info = tmp; 3548bf5fc093SJosef Bacik break; 3549bf5fc093SJosef Bacik } 3550bf5fc093SJosef Bacik } 35517fde62bfSChris Mason rcu_read_unlock(); 35521406e432SJosef Bacik 3553bf5fc093SJosef Bacik if (!info) 3554bf5fc093SJosef Bacik continue; 3555bf5fc093SJosef Bacik 3556bf5fc093SJosef Bacik down_read(&info->groups_sem); 3557bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3558bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3559bf5fc093SJosef Bacik slot_count++; 3560bf5fc093SJosef Bacik } 3561bf5fc093SJosef Bacik up_read(&info->groups_sem); 3562bf5fc093SJosef Bacik } 3563bf5fc093SJosef Bacik 35647fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35657fde62bfSChris Mason if (space_args.space_slots == 0) { 35667fde62bfSChris Mason space_args.total_spaces = slot_count; 35677fde62bfSChris Mason goto out; 35687fde62bfSChris Mason } 3569bf5fc093SJosef Bacik 357051788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3571bf5fc093SJosef Bacik 35727fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3573bf5fc093SJosef Bacik 35747fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35757fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35767fde62bfSChris Mason */ 35777fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 35787fde62bfSChris Mason return -ENOMEM; 35797fde62bfSChris Mason 35807fde62bfSChris Mason space_args.total_spaces = 0; 35817fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 35827fde62bfSChris Mason if (!dest) 35837fde62bfSChris Mason return -ENOMEM; 35847fde62bfSChris Mason dest_orig = dest; 35857fde62bfSChris Mason 35867fde62bfSChris Mason /* now we have a buffer to copy into */ 3587bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3588bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3589bf5fc093SJosef Bacik 359051788b1bSDan Rosenberg if (!slot_count) 359151788b1bSDan Rosenberg break; 359251788b1bSDan Rosenberg 3593bf5fc093SJosef Bacik info = NULL; 35941406e432SJosef Bacik rcu_read_lock(); 3595bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 3596bf5fc093SJosef Bacik list) { 3597bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3598bf5fc093SJosef Bacik info = tmp; 35997fde62bfSChris Mason break; 3600bf5fc093SJosef Bacik } 3601bf5fc093SJosef Bacik } 3602bf5fc093SJosef Bacik rcu_read_unlock(); 36037fde62bfSChris Mason 3604bf5fc093SJosef Bacik if (!info) 3605bf5fc093SJosef Bacik continue; 3606bf5fc093SJosef Bacik down_read(&info->groups_sem); 3607bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3608bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 36095af3e8ccSStefan Behrens btrfs_get_block_group_info( 36105af3e8ccSStefan Behrens &info->block_groups[c], &space); 36117fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36121406e432SJosef Bacik dest++; 36131406e432SJosef Bacik space_args.total_spaces++; 361451788b1bSDan Rosenberg slot_count--; 36151406e432SJosef Bacik } 361651788b1bSDan Rosenberg if (!slot_count) 361751788b1bSDan Rosenberg break; 3618bf5fc093SJosef Bacik } 3619bf5fc093SJosef Bacik up_read(&info->groups_sem); 3620bf5fc093SJosef Bacik } 36211406e432SJosef Bacik 36222eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36237fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36247fde62bfSChris Mason 36257fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36267fde62bfSChris Mason ret = -EFAULT; 36277fde62bfSChris Mason 36287fde62bfSChris Mason kfree(dest_orig); 36297fde62bfSChris Mason out: 36307fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36311406e432SJosef Bacik ret = -EFAULT; 36321406e432SJosef Bacik 36331406e432SJosef Bacik return ret; 36341406e432SJosef Bacik } 36351406e432SJosef Bacik 3636f46b5a66SChristoph Hellwig /* 3637f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3638f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3639f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3640f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3641f46b5a66SChristoph Hellwig */ 3642f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3643f46b5a66SChristoph Hellwig { 3644496ad9aaSAl Viro struct inode *inode = file_inode(file); 3645f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3646f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3647f46b5a66SChristoph Hellwig 3648f46b5a66SChristoph Hellwig trans = file->private_data; 36491ab86aedSSage Weil if (!trans) 36501ab86aedSSage Weil return -EINVAL; 3651b214107eSChristoph Hellwig file->private_data = NULL; 36529ca9ee09SSage Weil 36531ab86aedSSage Weil btrfs_end_transaction(trans, root); 36541ab86aedSSage Weil 3655a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 36569ca9ee09SSage Weil 36572a79f17eSAl Viro mnt_drop_write_file(file); 36581ab86aedSSage Weil return 0; 3659f46b5a66SChristoph Hellwig } 3660f46b5a66SChristoph Hellwig 36619a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36629a8c28beSMiao Xie void __user *argp) 366346204592SSage Weil { 366446204592SSage Weil struct btrfs_trans_handle *trans; 366546204592SSage Weil u64 transid; 3666db5b493aSTsutomu Itoh int ret; 366746204592SSage Weil 3668d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3669ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3670ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 367198d5dc13STsutomu Itoh return PTR_ERR(trans); 3672ff7c1d33SMiao Xie 3673ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3674ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3675ff7c1d33SMiao Xie goto out; 3676ff7c1d33SMiao Xie } 367746204592SSage Weil transid = trans->transid; 3678db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 36798b2b2d3cSTsutomu Itoh if (ret) { 36808b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3681db5b493aSTsutomu Itoh return ret; 36828b2b2d3cSTsutomu Itoh } 3683ff7c1d33SMiao Xie out: 368446204592SSage Weil if (argp) 368546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 368646204592SSage Weil return -EFAULT; 368746204592SSage Weil return 0; 368846204592SSage Weil } 368946204592SSage Weil 36909a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 36919a8c28beSMiao Xie void __user *argp) 369246204592SSage Weil { 369346204592SSage Weil u64 transid; 369446204592SSage Weil 369546204592SSage Weil if (argp) { 369646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 369746204592SSage Weil return -EFAULT; 369846204592SSage Weil } else { 369946204592SSage Weil transid = 0; /* current trans */ 370046204592SSage Weil } 370146204592SSage Weil return btrfs_wait_for_commit(root, transid); 370246204592SSage Weil } 370346204592SSage Weil 3704b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3705475f6387SJan Schmidt { 3706496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3707475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3708b8e95489SMiao Xie int ret; 3709475f6387SJan Schmidt 3710475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3711475f6387SJan Schmidt return -EPERM; 3712475f6387SJan Schmidt 3713475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3714475f6387SJan Schmidt if (IS_ERR(sa)) 3715475f6387SJan Schmidt return PTR_ERR(sa); 3716475f6387SJan Schmidt 3717b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3718b8e95489SMiao Xie ret = mnt_want_write_file(file); 3719b8e95489SMiao Xie if (ret) 3720b8e95489SMiao Xie goto out; 3721b8e95489SMiao Xie } 3722b8e95489SMiao Xie 3723aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 372463a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 372563a212abSStefan Behrens 0); 3726475f6387SJan Schmidt 3727475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3728475f6387SJan Schmidt ret = -EFAULT; 3729475f6387SJan Schmidt 3730b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3731b8e95489SMiao Xie mnt_drop_write_file(file); 3732b8e95489SMiao Xie out: 3733475f6387SJan Schmidt kfree(sa); 3734475f6387SJan Schmidt return ret; 3735475f6387SJan Schmidt } 3736475f6387SJan Schmidt 3737475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3738475f6387SJan Schmidt { 3739475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3740475f6387SJan Schmidt return -EPERM; 3741475f6387SJan Schmidt 3742aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 3743475f6387SJan Schmidt } 3744475f6387SJan Schmidt 3745475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3746475f6387SJan Schmidt void __user *arg) 3747475f6387SJan Schmidt { 3748475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3749475f6387SJan Schmidt int ret; 3750475f6387SJan Schmidt 3751475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3752475f6387SJan Schmidt return -EPERM; 3753475f6387SJan Schmidt 3754475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3755475f6387SJan Schmidt if (IS_ERR(sa)) 3756475f6387SJan Schmidt return PTR_ERR(sa); 3757475f6387SJan Schmidt 3758475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3759475f6387SJan Schmidt 3760475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3761475f6387SJan Schmidt ret = -EFAULT; 3762475f6387SJan Schmidt 3763475f6387SJan Schmidt kfree(sa); 3764475f6387SJan Schmidt return ret; 3765475f6387SJan Schmidt } 3766475f6387SJan Schmidt 3767c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3768b27f7c0cSDavid Sterba void __user *arg) 3769c11d2c23SStefan Behrens { 3770c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3771c11d2c23SStefan Behrens int ret; 3772c11d2c23SStefan Behrens 3773c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3774c11d2c23SStefan Behrens if (IS_ERR(sa)) 3775c11d2c23SStefan Behrens return PTR_ERR(sa); 3776c11d2c23SStefan Behrens 3777b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3778b27f7c0cSDavid Sterba kfree(sa); 3779b27f7c0cSDavid Sterba return -EPERM; 3780b27f7c0cSDavid Sterba } 3781b27f7c0cSDavid Sterba 3782b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3783c11d2c23SStefan Behrens 3784c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3785c11d2c23SStefan Behrens ret = -EFAULT; 3786c11d2c23SStefan Behrens 3787c11d2c23SStefan Behrens kfree(sa); 3788c11d2c23SStefan Behrens return ret; 3789c11d2c23SStefan Behrens } 3790c11d2c23SStefan Behrens 37913f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 37923f6bcfbdSStefan Behrens { 37933f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37943f6bcfbdSStefan Behrens int ret; 37953f6bcfbdSStefan Behrens 37963f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37973f6bcfbdSStefan Behrens return -EPERM; 37983f6bcfbdSStefan Behrens 37993f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38003f6bcfbdSStefan Behrens if (IS_ERR(p)) 38013f6bcfbdSStefan Behrens return PTR_ERR(p); 38023f6bcfbdSStefan Behrens 38033f6bcfbdSStefan Behrens switch (p->cmd) { 38043f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3805adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 3806adfa97cbSIlya Dryomov ret = -EROFS; 3807adfa97cbSIlya Dryomov goto out; 3808adfa97cbSIlya Dryomov } 38093f6bcfbdSStefan Behrens if (atomic_xchg( 38103f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 38113f6bcfbdSStefan Behrens 1)) { 3812e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38133f6bcfbdSStefan Behrens } else { 38143f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 38153f6bcfbdSStefan Behrens atomic_set( 38163f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 38173f6bcfbdSStefan Behrens 0); 38183f6bcfbdSStefan Behrens } 38193f6bcfbdSStefan Behrens break; 38203f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38213f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 38223f6bcfbdSStefan Behrens ret = 0; 38233f6bcfbdSStefan Behrens break; 38243f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 38253f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 38263f6bcfbdSStefan Behrens break; 38273f6bcfbdSStefan Behrens default: 38283f6bcfbdSStefan Behrens ret = -EINVAL; 38293f6bcfbdSStefan Behrens break; 38303f6bcfbdSStefan Behrens } 38313f6bcfbdSStefan Behrens 38323f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 38333f6bcfbdSStefan Behrens ret = -EFAULT; 3834adfa97cbSIlya Dryomov out: 38353f6bcfbdSStefan Behrens kfree(p); 38363f6bcfbdSStefan Behrens return ret; 38373f6bcfbdSStefan Behrens } 38383f6bcfbdSStefan Behrens 3839d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3840d7728c96SJan Schmidt { 3841d7728c96SJan Schmidt int ret = 0; 3842d7728c96SJan Schmidt int i; 3843740c3d22SChris Mason u64 rel_ptr; 3844d7728c96SJan Schmidt int size; 3845806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3846d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3847d7728c96SJan Schmidt struct btrfs_path *path; 3848d7728c96SJan Schmidt 384982b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3850d7728c96SJan Schmidt return -EPERM; 3851d7728c96SJan Schmidt 3852d7728c96SJan Schmidt path = btrfs_alloc_path(); 3853d7728c96SJan Schmidt if (!path) { 3854d7728c96SJan Schmidt ret = -ENOMEM; 3855d7728c96SJan Schmidt goto out; 3856d7728c96SJan Schmidt } 3857d7728c96SJan Schmidt 3858d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3859d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3860d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3861d7728c96SJan Schmidt ipa = NULL; 3862d7728c96SJan Schmidt goto out; 3863d7728c96SJan Schmidt } 3864d7728c96SJan Schmidt 3865d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3866d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3867d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3868d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3869d7728c96SJan Schmidt ipath = NULL; 3870d7728c96SJan Schmidt goto out; 3871d7728c96SJan Schmidt } 3872d7728c96SJan Schmidt 3873d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3874d7728c96SJan Schmidt if (ret < 0) 3875d7728c96SJan Schmidt goto out; 3876d7728c96SJan Schmidt 3877d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3878745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3879745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3880740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3881d7728c96SJan Schmidt } 3882d7728c96SJan Schmidt 3883745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3884745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3885d7728c96SJan Schmidt if (ret) { 3886d7728c96SJan Schmidt ret = -EFAULT; 3887d7728c96SJan Schmidt goto out; 3888d7728c96SJan Schmidt } 3889d7728c96SJan Schmidt 3890d7728c96SJan Schmidt out: 3891d7728c96SJan Schmidt btrfs_free_path(path); 3892d7728c96SJan Schmidt free_ipath(ipath); 3893d7728c96SJan Schmidt kfree(ipa); 3894d7728c96SJan Schmidt 3895d7728c96SJan Schmidt return ret; 3896d7728c96SJan Schmidt } 3897d7728c96SJan Schmidt 3898d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3899d7728c96SJan Schmidt { 3900d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3901d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3902d7728c96SJan Schmidt 3903d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3904d7728c96SJan Schmidt inodes->bytes_left -= c; 3905d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3906d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3907d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3908d7728c96SJan Schmidt inodes->elem_cnt += 3; 3909d7728c96SJan Schmidt } else { 3910d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3911d7728c96SJan Schmidt inodes->bytes_left = 0; 3912d7728c96SJan Schmidt inodes->elem_missed += 3; 3913d7728c96SJan Schmidt } 3914d7728c96SJan Schmidt 3915d7728c96SJan Schmidt return 0; 3916d7728c96SJan Schmidt } 3917d7728c96SJan Schmidt 3918d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3919d7728c96SJan Schmidt void __user *arg) 3920d7728c96SJan Schmidt { 3921d7728c96SJan Schmidt int ret = 0; 3922d7728c96SJan Schmidt int size; 3923d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3924d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3925d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3926d7728c96SJan Schmidt 3927d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3928d7728c96SJan Schmidt return -EPERM; 3929d7728c96SJan Schmidt 3930d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3931d7728c96SJan Schmidt if (IS_ERR(loi)) { 3932d7728c96SJan Schmidt ret = PTR_ERR(loi); 3933d7728c96SJan Schmidt loi = NULL; 3934d7728c96SJan Schmidt goto out; 3935d7728c96SJan Schmidt } 3936d7728c96SJan Schmidt 3937d7728c96SJan Schmidt path = btrfs_alloc_path(); 3938d7728c96SJan Schmidt if (!path) { 3939d7728c96SJan Schmidt ret = -ENOMEM; 3940d7728c96SJan Schmidt goto out; 3941d7728c96SJan Schmidt } 3942d7728c96SJan Schmidt 3943425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3944d7728c96SJan Schmidt inodes = init_data_container(size); 3945d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3946d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3947d7728c96SJan Schmidt inodes = NULL; 3948d7728c96SJan Schmidt goto out; 3949d7728c96SJan Schmidt } 3950d7728c96SJan Schmidt 3951df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3952df031f07SLiu Bo build_ino_list, inodes); 3953df031f07SLiu Bo if (ret == -EINVAL) 3954d7728c96SJan Schmidt ret = -ENOENT; 3955d7728c96SJan Schmidt if (ret < 0) 3956d7728c96SJan Schmidt goto out; 3957d7728c96SJan Schmidt 3958745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3959745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3960d7728c96SJan Schmidt if (ret) 3961d7728c96SJan Schmidt ret = -EFAULT; 3962d7728c96SJan Schmidt 3963d7728c96SJan Schmidt out: 3964d7728c96SJan Schmidt btrfs_free_path(path); 3965425d17a2SLiu Bo vfree(inodes); 3966d7728c96SJan Schmidt kfree(loi); 3967d7728c96SJan Schmidt 3968d7728c96SJan Schmidt return ret; 3969d7728c96SJan Schmidt } 3970d7728c96SJan Schmidt 397119a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3972c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3973c9e9f97bSIlya Dryomov { 3974c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3975c9e9f97bSIlya Dryomov 3976c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3977c9e9f97bSIlya Dryomov 3978837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3979837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3980837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3981837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3982a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3983a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3984837d5b6eSIlya Dryomov 3985c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3986c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3987c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 398819a39dceSIlya Dryomov 398919a39dceSIlya Dryomov if (lock) { 399019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 399119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 399219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 399319a39dceSIlya Dryomov } else { 399419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 399519a39dceSIlya Dryomov } 3996c9e9f97bSIlya Dryomov } 3997c9e9f97bSIlya Dryomov 39989ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3999c9e9f97bSIlya Dryomov { 4000496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4001c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4002c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4003c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4004ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4005c9e9f97bSIlya Dryomov int ret; 4006c9e9f97bSIlya Dryomov 4007c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4008c9e9f97bSIlya Dryomov return -EPERM; 4009c9e9f97bSIlya Dryomov 4010e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40119ba1f6e4SLiu Bo if (ret) 40129ba1f6e4SLiu Bo return ret; 40139ba1f6e4SLiu Bo 4014ed0fb78fSIlya Dryomov again: 4015ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4016c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4017c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4018ed0fb78fSIlya Dryomov need_unlock = true; 4019ed0fb78fSIlya Dryomov goto locked; 4020ed0fb78fSIlya Dryomov } 4021ed0fb78fSIlya Dryomov 4022ed0fb78fSIlya Dryomov /* 4023ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4024ed0fb78fSIlya Dryomov * (1) some other op is running 4025ed0fb78fSIlya Dryomov * (2) balance is running 4026ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4027ed0fb78fSIlya Dryomov */ 4028ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4029ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4030ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4031ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4032ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4033ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4034ed0fb78fSIlya Dryomov goto again; 4035ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4036ed0fb78fSIlya Dryomov 4037ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4038ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4039ed0fb78fSIlya Dryomov /* this is (3) */ 4040ed0fb78fSIlya Dryomov need_unlock = false; 4041ed0fb78fSIlya Dryomov goto locked; 4042ed0fb78fSIlya Dryomov } 4043ed0fb78fSIlya Dryomov 4044ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4045ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4046ed0fb78fSIlya Dryomov goto again; 4047ed0fb78fSIlya Dryomov } else { 4048ed0fb78fSIlya Dryomov /* this is (2) */ 4049ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4050ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4051ed0fb78fSIlya Dryomov goto out; 4052ed0fb78fSIlya Dryomov } 4053ed0fb78fSIlya Dryomov } else { 4054ed0fb78fSIlya Dryomov /* this is (1) */ 4055ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4056e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4057ed0fb78fSIlya Dryomov goto out; 4058ed0fb78fSIlya Dryomov } 4059ed0fb78fSIlya Dryomov 4060ed0fb78fSIlya Dryomov locked: 4061ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4062c9e9f97bSIlya Dryomov 4063c9e9f97bSIlya Dryomov if (arg) { 4064c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4065c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4066c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4067ed0fb78fSIlya Dryomov goto out_unlock; 4068c9e9f97bSIlya Dryomov } 4069de322263SIlya Dryomov 4070de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4071de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4072de322263SIlya Dryomov ret = -ENOTCONN; 4073de322263SIlya Dryomov goto out_bargs; 4074de322263SIlya Dryomov } 4075de322263SIlya Dryomov 4076de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4077de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4078de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4079de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4080de322263SIlya Dryomov 4081de322263SIlya Dryomov goto do_balance; 4082de322263SIlya Dryomov } 4083c9e9f97bSIlya Dryomov } else { 4084c9e9f97bSIlya Dryomov bargs = NULL; 4085c9e9f97bSIlya Dryomov } 4086c9e9f97bSIlya Dryomov 4087ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4088837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4089837d5b6eSIlya Dryomov goto out_bargs; 4090837d5b6eSIlya Dryomov } 4091837d5b6eSIlya Dryomov 4092c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 4093c9e9f97bSIlya Dryomov if (!bctl) { 4094c9e9f97bSIlya Dryomov ret = -ENOMEM; 4095c9e9f97bSIlya Dryomov goto out_bargs; 4096c9e9f97bSIlya Dryomov } 4097c9e9f97bSIlya Dryomov 4098c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4099c9e9f97bSIlya Dryomov if (arg) { 4100c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4101c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4102c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4103c9e9f97bSIlya Dryomov 4104c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4105f43ffb60SIlya Dryomov } else { 4106f43ffb60SIlya Dryomov /* balance everything - no filters */ 4107f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4108c9e9f97bSIlya Dryomov } 4109c9e9f97bSIlya Dryomov 4110de322263SIlya Dryomov do_balance: 4111c9e9f97bSIlya Dryomov /* 4112ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4113ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4114ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4115ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4116ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4117c9e9f97bSIlya Dryomov */ 4118ed0fb78fSIlya Dryomov need_unlock = false; 4119ed0fb78fSIlya Dryomov 4120ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 4121ed0fb78fSIlya Dryomov 4122c9e9f97bSIlya Dryomov if (arg) { 4123c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4124c9e9f97bSIlya Dryomov ret = -EFAULT; 4125c9e9f97bSIlya Dryomov } 4126c9e9f97bSIlya Dryomov 4127c9e9f97bSIlya Dryomov out_bargs: 4128c9e9f97bSIlya Dryomov kfree(bargs); 4129ed0fb78fSIlya Dryomov out_unlock: 4130c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4131c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4132ed0fb78fSIlya Dryomov if (need_unlock) 4133ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4134ed0fb78fSIlya Dryomov out: 4135e54bfa31SLiu Bo mnt_drop_write_file(file); 4136c9e9f97bSIlya Dryomov return ret; 4137c9e9f97bSIlya Dryomov } 4138c9e9f97bSIlya Dryomov 4139837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4140837d5b6eSIlya Dryomov { 4141837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4142837d5b6eSIlya Dryomov return -EPERM; 4143837d5b6eSIlya Dryomov 4144837d5b6eSIlya Dryomov switch (cmd) { 4145837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4146837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4147a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4148a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4149837d5b6eSIlya Dryomov } 4150837d5b6eSIlya Dryomov 4151837d5b6eSIlya Dryomov return -EINVAL; 4152837d5b6eSIlya Dryomov } 4153837d5b6eSIlya Dryomov 415419a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 415519a39dceSIlya Dryomov void __user *arg) 415619a39dceSIlya Dryomov { 415719a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 415819a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 415919a39dceSIlya Dryomov int ret = 0; 416019a39dceSIlya Dryomov 416119a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 416219a39dceSIlya Dryomov return -EPERM; 416319a39dceSIlya Dryomov 416419a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 416519a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 416619a39dceSIlya Dryomov ret = -ENOTCONN; 416719a39dceSIlya Dryomov goto out; 416819a39dceSIlya Dryomov } 416919a39dceSIlya Dryomov 417019a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 417119a39dceSIlya Dryomov if (!bargs) { 417219a39dceSIlya Dryomov ret = -ENOMEM; 417319a39dceSIlya Dryomov goto out; 417419a39dceSIlya Dryomov } 417519a39dceSIlya Dryomov 417619a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 417719a39dceSIlya Dryomov 417819a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 417919a39dceSIlya Dryomov ret = -EFAULT; 418019a39dceSIlya Dryomov 418119a39dceSIlya Dryomov kfree(bargs); 418219a39dceSIlya Dryomov out: 418319a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 418419a39dceSIlya Dryomov return ret; 418519a39dceSIlya Dryomov } 418619a39dceSIlya Dryomov 4187905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41885d13a37bSArne Jansen { 4189496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 41905d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41915d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 41925d13a37bSArne Jansen int ret; 41935d13a37bSArne Jansen int err; 41945d13a37bSArne Jansen 41955d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41965d13a37bSArne Jansen return -EPERM; 41975d13a37bSArne Jansen 4198905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4199905b0ddaSMiao Xie if (ret) 4200905b0ddaSMiao Xie return ret; 42015d13a37bSArne Jansen 42025d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4203905b0ddaSMiao Xie if (IS_ERR(sa)) { 4204905b0ddaSMiao Xie ret = PTR_ERR(sa); 4205905b0ddaSMiao Xie goto drop_write; 4206905b0ddaSMiao Xie } 42075d13a37bSArne Jansen 42087708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 420992f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 42105d13a37bSArne Jansen if (IS_ERR(trans)) { 42115d13a37bSArne Jansen ret = PTR_ERR(trans); 42125d13a37bSArne Jansen goto out; 42135d13a37bSArne Jansen } 42145d13a37bSArne Jansen 42155d13a37bSArne Jansen switch (sa->cmd) { 42165d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 42175d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 42185d13a37bSArne Jansen break; 42195d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 42205d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 42215d13a37bSArne Jansen break; 42225d13a37bSArne Jansen default: 42235d13a37bSArne Jansen ret = -EINVAL; 42245d13a37bSArne Jansen break; 42255d13a37bSArne Jansen } 42265d13a37bSArne Jansen 422792f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 42285d13a37bSArne Jansen if (err && !ret) 42295d13a37bSArne Jansen ret = err; 42305d13a37bSArne Jansen out: 42315d13a37bSArne Jansen kfree(sa); 42327708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4233905b0ddaSMiao Xie drop_write: 4234905b0ddaSMiao Xie mnt_drop_write_file(file); 42355d13a37bSArne Jansen return ret; 42365d13a37bSArne Jansen } 42375d13a37bSArne Jansen 4238905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42395d13a37bSArne Jansen { 4240496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42415d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42425d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42435d13a37bSArne Jansen int ret; 42445d13a37bSArne Jansen int err; 42455d13a37bSArne Jansen 42465d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42475d13a37bSArne Jansen return -EPERM; 42485d13a37bSArne Jansen 4249905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4250905b0ddaSMiao Xie if (ret) 4251905b0ddaSMiao Xie return ret; 42525d13a37bSArne Jansen 42535d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4254905b0ddaSMiao Xie if (IS_ERR(sa)) { 4255905b0ddaSMiao Xie ret = PTR_ERR(sa); 4256905b0ddaSMiao Xie goto drop_write; 4257905b0ddaSMiao Xie } 42585d13a37bSArne Jansen 42595d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42605d13a37bSArne Jansen if (IS_ERR(trans)) { 42615d13a37bSArne Jansen ret = PTR_ERR(trans); 42625d13a37bSArne Jansen goto out; 42635d13a37bSArne Jansen } 42645d13a37bSArne Jansen 42655d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 42665d13a37bSArne Jansen if (sa->assign) { 42675d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 42685d13a37bSArne Jansen sa->src, sa->dst); 42695d13a37bSArne Jansen } else { 42705d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 42715d13a37bSArne Jansen sa->src, sa->dst); 42725d13a37bSArne Jansen } 42735d13a37bSArne Jansen 42745d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 42755d13a37bSArne Jansen if (err && !ret) 42765d13a37bSArne Jansen ret = err; 42775d13a37bSArne Jansen 42785d13a37bSArne Jansen out: 42795d13a37bSArne Jansen kfree(sa); 4280905b0ddaSMiao Xie drop_write: 4281905b0ddaSMiao Xie mnt_drop_write_file(file); 42825d13a37bSArne Jansen return ret; 42835d13a37bSArne Jansen } 42845d13a37bSArne Jansen 4285905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42865d13a37bSArne Jansen { 4287496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 42885d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42895d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42905d13a37bSArne Jansen int ret; 42915d13a37bSArne Jansen int err; 42925d13a37bSArne Jansen 42935d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42945d13a37bSArne Jansen return -EPERM; 42955d13a37bSArne Jansen 4296905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4297905b0ddaSMiao Xie if (ret) 4298905b0ddaSMiao Xie return ret; 42995d13a37bSArne Jansen 43005d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4301905b0ddaSMiao Xie if (IS_ERR(sa)) { 4302905b0ddaSMiao Xie ret = PTR_ERR(sa); 4303905b0ddaSMiao Xie goto drop_write; 4304905b0ddaSMiao Xie } 43055d13a37bSArne Jansen 4306d86e56cfSMiao Xie if (!sa->qgroupid) { 4307d86e56cfSMiao Xie ret = -EINVAL; 4308d86e56cfSMiao Xie goto out; 4309d86e56cfSMiao Xie } 4310d86e56cfSMiao Xie 43115d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43125d13a37bSArne Jansen if (IS_ERR(trans)) { 43135d13a37bSArne Jansen ret = PTR_ERR(trans); 43145d13a37bSArne Jansen goto out; 43155d13a37bSArne Jansen } 43165d13a37bSArne Jansen 43175d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 43185d13a37bSArne Jansen if (sa->create) { 43195d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 43205d13a37bSArne Jansen NULL); 43215d13a37bSArne Jansen } else { 43225d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 43235d13a37bSArne Jansen } 43245d13a37bSArne Jansen 43255d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 43265d13a37bSArne Jansen if (err && !ret) 43275d13a37bSArne Jansen ret = err; 43285d13a37bSArne Jansen 43295d13a37bSArne Jansen out: 43305d13a37bSArne Jansen kfree(sa); 4331905b0ddaSMiao Xie drop_write: 4332905b0ddaSMiao Xie mnt_drop_write_file(file); 43335d13a37bSArne Jansen return ret; 43345d13a37bSArne Jansen } 43355d13a37bSArne Jansen 4336905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43375d13a37bSArne Jansen { 4338496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43415d13a37bSArne Jansen int ret; 43425d13a37bSArne Jansen int err; 43435d13a37bSArne Jansen u64 qgroupid; 43445d13a37bSArne Jansen 43455d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43465d13a37bSArne Jansen return -EPERM; 43475d13a37bSArne Jansen 4348905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4349905b0ddaSMiao Xie if (ret) 4350905b0ddaSMiao Xie return ret; 43515d13a37bSArne Jansen 43525d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4353905b0ddaSMiao Xie if (IS_ERR(sa)) { 4354905b0ddaSMiao Xie ret = PTR_ERR(sa); 4355905b0ddaSMiao Xie goto drop_write; 4356905b0ddaSMiao Xie } 43575d13a37bSArne Jansen 43585d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43595d13a37bSArne Jansen if (IS_ERR(trans)) { 43605d13a37bSArne Jansen ret = PTR_ERR(trans); 43615d13a37bSArne Jansen goto out; 43625d13a37bSArne Jansen } 43635d13a37bSArne Jansen 43645d13a37bSArne Jansen qgroupid = sa->qgroupid; 43655d13a37bSArne Jansen if (!qgroupid) { 43665d13a37bSArne Jansen /* take the current subvol as qgroup */ 43675d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43685d13a37bSArne Jansen } 43695d13a37bSArne Jansen 43705d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 43715d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 43725d13a37bSArne Jansen 43735d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 43745d13a37bSArne Jansen if (err && !ret) 43755d13a37bSArne Jansen ret = err; 43765d13a37bSArne Jansen 43775d13a37bSArne Jansen out: 43785d13a37bSArne Jansen kfree(sa); 4379905b0ddaSMiao Xie drop_write: 4380905b0ddaSMiao Xie mnt_drop_write_file(file); 43815d13a37bSArne Jansen return ret; 43825d13a37bSArne Jansen } 43835d13a37bSArne Jansen 43842f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43852f232036SJan Schmidt { 43866d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 43872f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43882f232036SJan Schmidt int ret; 43892f232036SJan Schmidt 43902f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43912f232036SJan Schmidt return -EPERM; 43922f232036SJan Schmidt 43932f232036SJan Schmidt ret = mnt_want_write_file(file); 43942f232036SJan Schmidt if (ret) 43952f232036SJan Schmidt return ret; 43962f232036SJan Schmidt 43972f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43982f232036SJan Schmidt if (IS_ERR(qsa)) { 43992f232036SJan Schmidt ret = PTR_ERR(qsa); 44002f232036SJan Schmidt goto drop_write; 44012f232036SJan Schmidt } 44022f232036SJan Schmidt 44032f232036SJan Schmidt if (qsa->flags) { 44042f232036SJan Schmidt ret = -EINVAL; 44052f232036SJan Schmidt goto out; 44062f232036SJan Schmidt } 44072f232036SJan Schmidt 44082f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 44092f232036SJan Schmidt 44102f232036SJan Schmidt out: 44112f232036SJan Schmidt kfree(qsa); 44122f232036SJan Schmidt drop_write: 44132f232036SJan Schmidt mnt_drop_write_file(file); 44142f232036SJan Schmidt return ret; 44152f232036SJan Schmidt } 44162f232036SJan Schmidt 44172f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 44182f232036SJan Schmidt { 44196d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 44202f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44212f232036SJan Schmidt int ret = 0; 44222f232036SJan Schmidt 44232f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44242f232036SJan Schmidt return -EPERM; 44252f232036SJan Schmidt 44262f232036SJan Schmidt qsa = kzalloc(sizeof(*qsa), GFP_NOFS); 44272f232036SJan Schmidt if (!qsa) 44282f232036SJan Schmidt return -ENOMEM; 44292f232036SJan Schmidt 44302f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44312f232036SJan Schmidt qsa->flags = 1; 44322f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 44332f232036SJan Schmidt } 44342f232036SJan Schmidt 44352f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44362f232036SJan Schmidt ret = -EFAULT; 44372f232036SJan Schmidt 44382f232036SJan Schmidt kfree(qsa); 44392f232036SJan Schmidt return ret; 44402f232036SJan Schmidt } 44412f232036SJan Schmidt 444257254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 444357254b6eSJan Schmidt { 444454563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 444557254b6eSJan Schmidt 444657254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 444757254b6eSJan Schmidt return -EPERM; 444857254b6eSJan Schmidt 444957254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 445057254b6eSJan Schmidt } 445157254b6eSJan Schmidt 4452abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4453abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44548ea05e3aSAlexander Block { 4455496ad9aaSAl Viro struct inode *inode = file_inode(file); 44568ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44578ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44588ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 44598ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 44608ea05e3aSAlexander Block int ret = 0; 4461dd5f9615SStefan Behrens int received_uuid_changed; 44628ea05e3aSAlexander Block 4463bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4464bd60ea0fSDavid Sterba return -EPERM; 4465bd60ea0fSDavid Sterba 44668ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44678ea05e3aSAlexander Block if (ret < 0) 44688ea05e3aSAlexander Block return ret; 44698ea05e3aSAlexander Block 44708ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 44718ea05e3aSAlexander Block 44728ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 44738ea05e3aSAlexander Block ret = -EINVAL; 44748ea05e3aSAlexander Block goto out; 44758ea05e3aSAlexander Block } 44768ea05e3aSAlexander Block 44778ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44788ea05e3aSAlexander Block ret = -EROFS; 44798ea05e3aSAlexander Block goto out; 44808ea05e3aSAlexander Block } 44818ea05e3aSAlexander Block 4482dd5f9615SStefan Behrens /* 4483dd5f9615SStefan Behrens * 1 - root item 4484dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4485dd5f9615SStefan Behrens */ 4486dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44878ea05e3aSAlexander Block if (IS_ERR(trans)) { 44888ea05e3aSAlexander Block ret = PTR_ERR(trans); 44898ea05e3aSAlexander Block trans = NULL; 44908ea05e3aSAlexander Block goto out; 44918ea05e3aSAlexander Block } 44928ea05e3aSAlexander Block 44938ea05e3aSAlexander Block sa->rtransid = trans->transid; 44948ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44958ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44968ea05e3aSAlexander Block 4497dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4498dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4499dd5f9615SStefan Behrens if (received_uuid_changed && 4500dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 4501dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 4502dd5f9615SStefan Behrens root_item->received_uuid, 4503dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4504dd5f9615SStefan Behrens root->root_key.objectid); 45058ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45068ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45078ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45083cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45093cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45103cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45113cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45128ea05e3aSAlexander Block 45138ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 45148ea05e3aSAlexander Block &root->root_key, &root->root_item); 45158ea05e3aSAlexander Block if (ret < 0) { 45168ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 45178ea05e3aSAlexander Block goto out; 4518dd5f9615SStefan Behrens } 4519dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4520dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 4521dd5f9615SStefan Behrens sa->uuid, 4522dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4523dd5f9615SStefan Behrens root->root_key.objectid); 4524dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 4525dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 4526dd5f9615SStefan Behrens goto out; 4527dd5f9615SStefan Behrens } 4528dd5f9615SStefan Behrens } 45298ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 4530dd5f9615SStefan Behrens if (ret < 0) { 4531dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 45328ea05e3aSAlexander Block goto out; 45338ea05e3aSAlexander Block } 45348ea05e3aSAlexander Block 4535abccd00fSHugo Mills out: 4536abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 4537abccd00fSHugo Mills mnt_drop_write_file(file); 4538abccd00fSHugo Mills return ret; 4539abccd00fSHugo Mills } 4540abccd00fSHugo Mills 4541abccd00fSHugo Mills #ifdef CONFIG_64BIT 4542abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4543abccd00fSHugo Mills void __user *arg) 4544abccd00fSHugo Mills { 4545abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4546abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4547abccd00fSHugo Mills int ret = 0; 4548abccd00fSHugo Mills 4549abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 4550abccd00fSHugo Mills if (IS_ERR(args32)) { 4551abccd00fSHugo Mills ret = PTR_ERR(args32); 4552abccd00fSHugo Mills args32 = NULL; 4553abccd00fSHugo Mills goto out; 4554abccd00fSHugo Mills } 4555abccd00fSHugo Mills 4556abccd00fSHugo Mills args64 = kmalloc(sizeof(*args64), GFP_NOFS); 455784dbeb87SDan Carpenter if (!args64) { 455884dbeb87SDan Carpenter ret = -ENOMEM; 4559abccd00fSHugo Mills goto out; 4560abccd00fSHugo Mills } 4561abccd00fSHugo Mills 4562abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4563abccd00fSHugo Mills args64->stransid = args32->stransid; 4564abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4565abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4566abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4567abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4568abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4569abccd00fSHugo Mills args64->flags = args32->flags; 4570abccd00fSHugo Mills 4571abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4572abccd00fSHugo Mills if (ret) 4573abccd00fSHugo Mills goto out; 4574abccd00fSHugo Mills 4575abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4576abccd00fSHugo Mills args32->stransid = args64->stransid; 4577abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4578abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4579abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4580abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4581abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4582abccd00fSHugo Mills args32->flags = args64->flags; 4583abccd00fSHugo Mills 4584abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4585abccd00fSHugo Mills if (ret) 4586abccd00fSHugo Mills ret = -EFAULT; 4587abccd00fSHugo Mills 4588abccd00fSHugo Mills out: 4589abccd00fSHugo Mills kfree(args32); 4590abccd00fSHugo Mills kfree(args64); 4591abccd00fSHugo Mills return ret; 4592abccd00fSHugo Mills } 4593abccd00fSHugo Mills #endif 4594abccd00fSHugo Mills 4595abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4596abccd00fSHugo Mills void __user *arg) 4597abccd00fSHugo Mills { 4598abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4599abccd00fSHugo Mills int ret = 0; 4600abccd00fSHugo Mills 4601abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 4602abccd00fSHugo Mills if (IS_ERR(sa)) { 4603abccd00fSHugo Mills ret = PTR_ERR(sa); 4604abccd00fSHugo Mills sa = NULL; 4605abccd00fSHugo Mills goto out; 4606abccd00fSHugo Mills } 4607abccd00fSHugo Mills 4608abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4609abccd00fSHugo Mills 4610abccd00fSHugo Mills if (ret) 4611abccd00fSHugo Mills goto out; 4612abccd00fSHugo Mills 46138ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46148ea05e3aSAlexander Block if (ret) 46158ea05e3aSAlexander Block ret = -EFAULT; 46168ea05e3aSAlexander Block 46178ea05e3aSAlexander Block out: 46188ea05e3aSAlexander Block kfree(sa); 46198ea05e3aSAlexander Block return ret; 46208ea05e3aSAlexander Block } 46218ea05e3aSAlexander Block 4622867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 4623867ab667Sjeff.liu { 46246d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4625a1b83ac5SAnand Jain size_t len; 4626867ab667Sjeff.liu int ret; 4627a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4628a1b83ac5SAnand Jain 4629a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4630a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 4631a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4632a1b83ac5SAnand Jain 4633a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4634867ab667Sjeff.liu 4635867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 4636efe120a0SFrank Holton btrfs_warn(root->fs_info, 4637efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 4638867ab667Sjeff.liu } 4639867ab667Sjeff.liu 4640867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4641867ab667Sjeff.liu 4642867ab667Sjeff.liu return ret ? -EFAULT : 0; 4643867ab667Sjeff.liu } 4644867ab667Sjeff.liu 4645a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4646a8bfd4abSjeff.liu { 46476d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4648a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 4649a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4650a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4651a8bfd4abSjeff.liu int ret; 4652a8bfd4abSjeff.liu 4653a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4654a8bfd4abSjeff.liu return -EPERM; 4655a8bfd4abSjeff.liu 4656a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4657a8bfd4abSjeff.liu return -EFAULT; 4658a8bfd4abSjeff.liu 4659a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 4660efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 4661a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4662a8bfd4abSjeff.liu return -EINVAL; 4663a8bfd4abSjeff.liu } 4664a8bfd4abSjeff.liu 4665a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4666a8bfd4abSjeff.liu if (ret) 4667a8bfd4abSjeff.liu return ret; 4668a8bfd4abSjeff.liu 4669a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4670a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4671a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4672a8bfd4abSjeff.liu goto out_unlock; 4673a8bfd4abSjeff.liu } 4674a8bfd4abSjeff.liu 4675a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 4676a8bfd4abSjeff.liu strcpy(super_block->label, label); 4677a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 4678d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 4679a8bfd4abSjeff.liu 4680a8bfd4abSjeff.liu out_unlock: 4681a8bfd4abSjeff.liu mnt_drop_write_file(file); 4682a8bfd4abSjeff.liu return ret; 4683a8bfd4abSjeff.liu } 4684a8bfd4abSjeff.liu 46852eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46862eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46872eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46882eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46892eaa055fSJeff Mahoney 46902eaa055fSJeff Mahoney static int btrfs_ioctl_get_supported_features(struct file *file, 46912eaa055fSJeff Mahoney void __user *arg) 46922eaa055fSJeff Mahoney { 46932eaa055fSJeff Mahoney static struct btrfs_ioctl_feature_flags features[3] = { 46942eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46952eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46962eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46972eaa055fSJeff Mahoney }; 46982eaa055fSJeff Mahoney 46992eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47002eaa055fSJeff Mahoney return -EFAULT; 47012eaa055fSJeff Mahoney 47022eaa055fSJeff Mahoney return 0; 47032eaa055fSJeff Mahoney } 47042eaa055fSJeff Mahoney 47052eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 47062eaa055fSJeff Mahoney { 47072eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47082eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 47092eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47102eaa055fSJeff Mahoney 47112eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47122eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47132eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47142eaa055fSJeff Mahoney 47152eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47162eaa055fSJeff Mahoney return -EFAULT; 47172eaa055fSJeff Mahoney 47182eaa055fSJeff Mahoney return 0; 47192eaa055fSJeff Mahoney } 47202eaa055fSJeff Mahoney 47213b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 47223b02a68aSJeff Mahoney enum btrfs_feature_set set, 47232eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47242eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47252eaa055fSJeff Mahoney { 47263b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 47273b02a68aSJeff Mahoney char *names; 47282eaa055fSJeff Mahoney u64 disallowed, unsupported; 47292eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47302eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47312eaa055fSJeff Mahoney 47322eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47332eaa055fSJeff Mahoney if (unsupported) { 47343b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47353b02a68aSJeff Mahoney if (names) { 47363b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 47373b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47383b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47393b02a68aSJeff Mahoney kfree(names); 47403b02a68aSJeff Mahoney } else 47412eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 47422eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47432eaa055fSJeff Mahoney type, unsupported); 47442eaa055fSJeff Mahoney return -EOPNOTSUPP; 47452eaa055fSJeff Mahoney } 47462eaa055fSJeff Mahoney 47472eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47482eaa055fSJeff Mahoney if (disallowed) { 47493b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47503b02a68aSJeff Mahoney if (names) { 47513b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 47523b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47533b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47543b02a68aSJeff Mahoney kfree(names); 47553b02a68aSJeff Mahoney } else 47562eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 47572eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47582eaa055fSJeff Mahoney type, disallowed); 47592eaa055fSJeff Mahoney return -EPERM; 47602eaa055fSJeff Mahoney } 47612eaa055fSJeff Mahoney 47622eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47632eaa055fSJeff Mahoney if (disallowed) { 47643b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47653b02a68aSJeff Mahoney if (names) { 47663b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 47673b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47683b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47693b02a68aSJeff Mahoney kfree(names); 47703b02a68aSJeff Mahoney } else 47712eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 47722eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47732eaa055fSJeff Mahoney type, disallowed); 47742eaa055fSJeff Mahoney return -EPERM; 47752eaa055fSJeff Mahoney } 47762eaa055fSJeff Mahoney 47772eaa055fSJeff Mahoney return 0; 47782eaa055fSJeff Mahoney } 47792eaa055fSJeff Mahoney 47802eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 47813b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 47822eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47832eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47842eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47852eaa055fSJeff Mahoney 47862eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47872eaa055fSJeff Mahoney { 47882eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47892eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 47902eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47912eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47922eaa055fSJeff Mahoney u64 newflags; 47932eaa055fSJeff Mahoney int ret; 47942eaa055fSJeff Mahoney 47952eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47962eaa055fSJeff Mahoney return -EPERM; 47972eaa055fSJeff Mahoney 47982eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47992eaa055fSJeff Mahoney return -EFAULT; 48002eaa055fSJeff Mahoney 48012eaa055fSJeff Mahoney /* Nothing to do */ 48022eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48032eaa055fSJeff Mahoney !flags[0].incompat_flags) 48042eaa055fSJeff Mahoney return 0; 48052eaa055fSJeff Mahoney 48062eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 48072eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48082eaa055fSJeff Mahoney if (ret) 48092eaa055fSJeff Mahoney return ret; 48102eaa055fSJeff Mahoney 48112eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 48122eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48132eaa055fSJeff Mahoney if (ret) 48142eaa055fSJeff Mahoney return ret; 48152eaa055fSJeff Mahoney 48162eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 48172eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48182eaa055fSJeff Mahoney if (ret) 48192eaa055fSJeff Mahoney return ret; 48202eaa055fSJeff Mahoney 48218051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48222eaa055fSJeff Mahoney if (IS_ERR(trans)) 48232eaa055fSJeff Mahoney return PTR_ERR(trans); 48242eaa055fSJeff Mahoney 48252eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 48262eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48272eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48282eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48292eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48302eaa055fSJeff Mahoney 48312eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48322eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48332eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48342eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48352eaa055fSJeff Mahoney 48362eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48372eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48382eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48392eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48402eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 48412eaa055fSJeff Mahoney 4842d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 48432eaa055fSJeff Mahoney } 48442eaa055fSJeff Mahoney 4845f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4846f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4847f46b5a66SChristoph Hellwig { 4848496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48494bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4850f46b5a66SChristoph Hellwig 4851f46b5a66SChristoph Hellwig switch (cmd) { 48526cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48536cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48546cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48556cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48566cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48576cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 4858f7039b1dSLi Dongyang case FITRIM: 4859f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 4860f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4861fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4862fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4863fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48643de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4865fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48666f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48676f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 486876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 486976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 48700caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48710caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48720caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48730caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48746ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48756ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4876f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48771e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48781e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48791e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4880f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4881198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4882f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48834bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 4884f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4885da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 4886475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 4887475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 4888475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 4889475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 4890f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48919ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4892f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 4893c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 4894c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 48957a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 4896f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 4897f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 4898f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 4899f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 4900ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4901ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4902ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4903ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4904d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4905d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4906d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4907d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 49081406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49091406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 49109b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49119b199859SFilipe David Borba Manana int ret; 49129b199859SFilipe David Borba Manana 49136c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 49149b199859SFilipe David Borba Manana if (ret) 49159b199859SFilipe David Borba Manana return ret; 49169b199859SFilipe David Borba Manana ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); 49179b199859SFilipe David Borba Manana return ret; 49189b199859SFilipe David Borba Manana } 491946204592SSage Weil case BTRFS_IOC_START_SYNC: 49209a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 492146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49229a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 4923475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4924b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4925475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 4926475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 4927475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 4928475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 4929c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49309ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4931837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 4932837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 493319a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 493419a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 49358ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49368ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4937abccd00fSHugo Mills #ifdef CONFIG_64BIT 4938abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4939abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4940abccd00fSHugo Mills #endif 494131db9f7cSAlexander Block case BTRFS_IOC_SEND: 494231db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 4943c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 4944b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 49455d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4946905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49475d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4948905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49495d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4950905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49515d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4952905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49532f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49542f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49552f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 49562f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 495757254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 495857254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 49593f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49603f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 4961867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 4962867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 4963a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 4964a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 4965416161dbSMark Fasheh case BTRFS_IOC_FILE_EXTENT_SAME: 4966416161dbSMark Fasheh return btrfs_ioctl_file_extent_same(file, argp); 49672eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 49682eaa055fSJeff Mahoney return btrfs_ioctl_get_supported_features(file, argp); 49692eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 49702eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 49712eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49722eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4973f46b5a66SChristoph Hellwig } 4974f46b5a66SChristoph Hellwig 4975f46b5a66SChristoph Hellwig return -ENOTTY; 4976f46b5a66SChristoph Hellwig } 4977