1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 4555e301fdSFilipe Brandenburger #include <linux/btrfs.h> 46416161dbSMark Fasheh #include <linux/uaccess.h> 47f46b5a66SChristoph Hellwig #include "ctree.h" 48f46b5a66SChristoph Hellwig #include "disk-io.h" 49f46b5a66SChristoph Hellwig #include "transaction.h" 50f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 583f6bcfbdSStefan Behrens #include "dev-replace.h" 5963541927SFilipe David Borba Manana #include "props.h" 603b02a68aSJeff Mahoney #include "sysfs.h" 61fcebe456SJosef Bacik #include "qgroup.h" 621ec9a1aeSFilipe Manana #include "tree-log.h" 63f46b5a66SChristoph Hellwig 64abccd00fSHugo Mills #ifdef CONFIG_64BIT 65abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 66abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 67abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 68abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 69abccd00fSHugo Mills */ 70abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 71abccd00fSHugo Mills __u64 sec; 72abccd00fSHugo Mills __u32 nsec; 73abccd00fSHugo Mills } __attribute__ ((__packed__)); 74abccd00fSHugo Mills 75abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 76abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 77abccd00fSHugo Mills __u64 stransid; /* in */ 78abccd00fSHugo Mills __u64 rtransid; /* out */ 79abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 80abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 81abccd00fSHugo Mills __u64 flags; /* in */ 82abccd00fSHugo Mills __u64 reserved[16]; /* in */ 83abccd00fSHugo Mills } __attribute__ ((__packed__)); 84abccd00fSHugo Mills 85abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 86abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 87abccd00fSHugo Mills #endif 88abccd00fSHugo Mills 89abccd00fSHugo Mills 90416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 911c919a5eSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff, 921c919a5eSMark Fasheh int no_time_update); 93416161dbSMark Fasheh 946cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 956cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 966cbff00fSChristoph Hellwig { 976cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 986cbff00fSChristoph Hellwig return flags; 996cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 1006cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1016cbff00fSChristoph Hellwig else 1026cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1036cbff00fSChristoph Hellwig } 104f46b5a66SChristoph Hellwig 1056cbff00fSChristoph Hellwig /* 1066cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 1076cbff00fSChristoph Hellwig */ 1086cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 1096cbff00fSChristoph Hellwig { 1106cbff00fSChristoph Hellwig unsigned int iflags = 0; 1116cbff00fSChristoph Hellwig 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1136cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1156cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1176cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1196cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1216cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1226cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1236cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 124d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 125d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 126d0092bddSLi Zefan 127d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 128d0092bddSLi Zefan iflags |= FS_COMPR_FL; 129d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 130d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig return iflags; 1336cbff00fSChristoph Hellwig } 1346cbff00fSChristoph Hellwig 1356cbff00fSChristoph Hellwig /* 1366cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1376cbff00fSChristoph Hellwig */ 1386cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1396cbff00fSChristoph Hellwig { 1406cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1413cc79392SFilipe Manana unsigned int new_fl = 0; 1426cbff00fSChristoph Hellwig 1436cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1443cc79392SFilipe Manana new_fl |= S_SYNC; 1456cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1463cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1476cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1483cc79392SFilipe Manana new_fl |= S_APPEND; 1496cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1503cc79392SFilipe Manana new_fl |= S_NOATIME; 1516cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1523cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1533cc79392SFilipe Manana 1543cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1553cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1563cc79392SFilipe Manana new_fl); 1576cbff00fSChristoph Hellwig } 1586cbff00fSChristoph Hellwig 1596cbff00fSChristoph Hellwig /* 1606cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1616cbff00fSChristoph Hellwig * 162e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1636cbff00fSChristoph Hellwig */ 1646cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1656cbff00fSChristoph Hellwig { 1660b4dcea5SChris Mason unsigned int flags; 1670b4dcea5SChris Mason 1680b4dcea5SChris Mason if (!dir) 1690b4dcea5SChris Mason return; 1700b4dcea5SChris Mason 1710b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1726cbff00fSChristoph Hellwig 173e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 174e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 175e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 176e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 177e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 178e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 179e27425d6SJosef Bacik } 1806cbff00fSChristoph Hellwig 181213490b3SLiu Bo if (flags & BTRFS_INODE_NODATACOW) { 182e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 183213490b3SLiu Bo if (S_ISREG(inode->i_mode)) 184213490b3SLiu Bo BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; 185213490b3SLiu Bo } 186e27425d6SJosef Bacik 1876cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1886cbff00fSChristoph Hellwig } 1896cbff00fSChristoph Hellwig 1906cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1916cbff00fSChristoph Hellwig { 192496ad9aaSAl Viro struct btrfs_inode *ip = BTRFS_I(file_inode(file)); 1936cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1946cbff00fSChristoph Hellwig 1956cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1966cbff00fSChristoph Hellwig return -EFAULT; 1976cbff00fSChristoph Hellwig return 0; 1986cbff00fSChristoph Hellwig } 1996cbff00fSChristoph Hellwig 20075e7cb7fSLiu Bo static int check_flags(unsigned int flags) 20175e7cb7fSLiu Bo { 20275e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20375e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20475e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 205e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 206e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20775e7cb7fSLiu Bo return -EOPNOTSUPP; 20875e7cb7fSLiu Bo 20975e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 21075e7cb7fSLiu Bo return -EINVAL; 21175e7cb7fSLiu Bo 21275e7cb7fSLiu Bo return 0; 21375e7cb7fSLiu Bo } 21475e7cb7fSLiu Bo 2156cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2166cbff00fSChristoph Hellwig { 217496ad9aaSAl Viro struct inode *inode = file_inode(file); 2186cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 2196cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 2206cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2216cbff00fSChristoph Hellwig unsigned int flags, oldflags; 2226cbff00fSChristoph Hellwig int ret; 223f062abf0SLi Zefan u64 ip_oldflags; 224f062abf0SLi Zefan unsigned int i_oldflags; 2257e97b8daSDavid Sterba umode_t mode; 2266cbff00fSChristoph Hellwig 227bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 228bd60ea0fSDavid Sterba return -EPERM; 229bd60ea0fSDavid Sterba 230b83cc969SLi Zefan if (btrfs_root_readonly(root)) 231b83cc969SLi Zefan return -EROFS; 232b83cc969SLi Zefan 2336cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 2346cbff00fSChristoph Hellwig return -EFAULT; 2356cbff00fSChristoph Hellwig 23675e7cb7fSLiu Bo ret = check_flags(flags); 23775e7cb7fSLiu Bo if (ret) 23875e7cb7fSLiu Bo return ret; 2396cbff00fSChristoph Hellwig 240e7848683SJan Kara ret = mnt_want_write_file(file); 241e7848683SJan Kara if (ret) 242e7848683SJan Kara return ret; 243e7848683SJan Kara 2445955102cSAl Viro inode_lock(inode); 2456cbff00fSChristoph Hellwig 246f062abf0SLi Zefan ip_oldflags = ip->flags; 247f062abf0SLi Zefan i_oldflags = inode->i_flags; 2487e97b8daSDavid Sterba mode = inode->i_mode; 249f062abf0SLi Zefan 2506cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2516cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2526cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2536cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2546cbff00fSChristoph Hellwig ret = -EPERM; 2556cbff00fSChristoph Hellwig goto out_unlock; 2566cbff00fSChristoph Hellwig } 2576cbff00fSChristoph Hellwig } 2586cbff00fSChristoph Hellwig 2596cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2606cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2616cbff00fSChristoph Hellwig else 2626cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2636cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2646cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2656cbff00fSChristoph Hellwig else 2666cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2676cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2686cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2696cbff00fSChristoph Hellwig else 2706cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2716cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2726cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2736cbff00fSChristoph Hellwig else 2746cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2756cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2766cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2776cbff00fSChristoph Hellwig else 2786cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2796cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2806cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2816cbff00fSChristoph Hellwig else 2826cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2837e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2847e97b8daSDavid Sterba if (S_ISREG(mode)) { 2857e97b8daSDavid Sterba /* 2867e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2877e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2887e97b8daSDavid Sterba * status of the file and will not set it. 2897e97b8daSDavid Sterba */ 2907e97b8daSDavid Sterba if (inode->i_size == 0) 2917e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2927e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2937e97b8daSDavid Sterba } else { 294e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2957e97b8daSDavid Sterba } 2967e97b8daSDavid Sterba } else { 2977e97b8daSDavid Sterba /* 2987e97b8daSDavid Sterba * Revert back under same assuptions as above 2997e97b8daSDavid Sterba */ 3007e97b8daSDavid Sterba if (S_ISREG(mode)) { 3017e97b8daSDavid Sterba if (inode->i_size == 0) 3027e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 3037e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 3047e97b8daSDavid Sterba } else { 305e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 3067e97b8daSDavid Sterba } 3077e97b8daSDavid Sterba } 3086cbff00fSChristoph Hellwig 30975e7cb7fSLiu Bo /* 31075e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 31175e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 31275e7cb7fSLiu Bo * things smaller. 31375e7cb7fSLiu Bo */ 31475e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 31575e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 31675e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 31763541927SFilipe David Borba Manana 31863541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31963541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 32063541927SFilipe David Borba Manana goto out_drop; 32175e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 32263541927SFilipe David Borba Manana const char *comp; 32363541927SFilipe David Borba Manana 32475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 32575e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 32663541927SFilipe David Borba Manana 32763541927SFilipe David Borba Manana if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 32863541927SFilipe David Borba Manana comp = "lzo"; 32963541927SFilipe David Borba Manana else 33063541927SFilipe David Borba Manana comp = "zlib"; 33163541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 33263541927SFilipe David Borba Manana comp, strlen(comp), 0); 33363541927SFilipe David Borba Manana if (ret) 33463541927SFilipe David Borba Manana goto out_drop; 33563541927SFilipe David Borba Manana 336ebcb904dSLi Zefan } else { 33778a017a2SFilipe Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 33878a017a2SFilipe Manana if (ret && ret != -ENODATA) 33978a017a2SFilipe Manana goto out_drop; 340ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 34175e7cb7fSLiu Bo } 3426cbff00fSChristoph Hellwig 3434da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 344f062abf0SLi Zefan if (IS_ERR(trans)) { 345f062abf0SLi Zefan ret = PTR_ERR(trans); 346f062abf0SLi Zefan goto out_drop; 347f062abf0SLi Zefan } 3486cbff00fSChristoph Hellwig 349306424ccSLi Zefan btrfs_update_iflags(inode); 3500c4d2d95SJosef Bacik inode_inc_iversion(inode); 35104b285f3SDeepa Dinamani inode->i_ctime = current_fs_time(inode->i_sb); 3526cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3536cbff00fSChristoph Hellwig 3546cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 355f062abf0SLi Zefan out_drop: 356f062abf0SLi Zefan if (ret) { 357f062abf0SLi Zefan ip->flags = ip_oldflags; 358f062abf0SLi Zefan inode->i_flags = i_oldflags; 359f062abf0SLi Zefan } 3606cbff00fSChristoph Hellwig 3616cbff00fSChristoph Hellwig out_unlock: 3625955102cSAl Viro inode_unlock(inode); 363e7848683SJan Kara mnt_drop_write_file(file); 3642d4e6f6aSliubo return ret; 3656cbff00fSChristoph Hellwig } 3666cbff00fSChristoph Hellwig 3676cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3686cbff00fSChristoph Hellwig { 369496ad9aaSAl Viro struct inode *inode = file_inode(file); 3706cbff00fSChristoph Hellwig 3716cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3726cbff00fSChristoph Hellwig } 373f46b5a66SChristoph Hellwig 374f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 375f7039b1dSLi Dongyang { 37654563d41SAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 377f7039b1dSLi Dongyang struct btrfs_device *device; 378f7039b1dSLi Dongyang struct request_queue *q; 379f7039b1dSLi Dongyang struct fstrim_range range; 380f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 381f7039b1dSLi Dongyang u64 num_devices = 0; 382815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 383f7039b1dSLi Dongyang int ret; 384f7039b1dSLi Dongyang 385f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 386f7039b1dSLi Dongyang return -EPERM; 387f7039b1dSLi Dongyang 3881f78160cSXiao Guangrong rcu_read_lock(); 3891f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3901f78160cSXiao Guangrong dev_list) { 391f7039b1dSLi Dongyang if (!device->bdev) 392f7039b1dSLi Dongyang continue; 393f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 394f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 395f7039b1dSLi Dongyang num_devices++; 396f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 397f7039b1dSLi Dongyang minlen); 398f7039b1dSLi Dongyang } 399f7039b1dSLi Dongyang } 4001f78160cSXiao Guangrong rcu_read_unlock(); 401f4c697e6SLukas Czerner 402f7039b1dSLi Dongyang if (!num_devices) 403f7039b1dSLi Dongyang return -EOPNOTSUPP; 404f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 405f7039b1dSLi Dongyang return -EFAULT; 406e515c18bSLukas Czerner if (range.start > total_bytes || 407e515c18bSLukas Czerner range.len < fs_info->sb->s_blocksize) 408f4c697e6SLukas Czerner return -EINVAL; 409f7039b1dSLi Dongyang 410f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 411f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 412815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 413f7039b1dSLi Dongyang if (ret < 0) 414f7039b1dSLi Dongyang return ret; 415f7039b1dSLi Dongyang 416f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 417f7039b1dSLi Dongyang return -EFAULT; 418f7039b1dSLi Dongyang 419f7039b1dSLi Dongyang return 0; 420f7039b1dSLi Dongyang } 421f7039b1dSLi Dongyang 422dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 423dd5f9615SStefan Behrens { 42446e0f66aSChris Mason int i; 42546e0f66aSChris Mason 42646e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 42746e0f66aSChris Mason if (uuid[i]) 42846e0f66aSChris Mason return 0; 42946e0f66aSChris Mason } 43046e0f66aSChris Mason return 1; 431dd5f9615SStefan Behrens } 432dd5f9615SStefan Behrens 433d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 434cb8e7090SChristoph Hellwig struct dentry *dentry, 43572fd032eSSage Weil char *name, int namelen, 4366f72c7e2SArne Jansen u64 *async_transid, 4378696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 438f46b5a66SChristoph Hellwig { 439f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 440f46b5a66SChristoph Hellwig struct btrfs_key key; 441f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 442f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 443f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 444d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 44576dda93cSYan, Zheng struct btrfs_root *new_root; 446d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 44704b285f3SDeepa Dinamani struct timespec cur_time = current_fs_time(dir->i_sb); 4485662344bSTsutomu Itoh struct inode *inode; 449f46b5a66SChristoph Hellwig int ret; 450f46b5a66SChristoph Hellwig int err; 451f46b5a66SChristoph Hellwig u64 objectid; 452f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 4533de4586cSChris Mason u64 index = 0; 454d5c12070SMiao Xie u64 qgroup_reserved; 4558ea05e3aSAlexander Block uuid_le new_uuid; 456f46b5a66SChristoph Hellwig 457581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 4582fbe8c8aSAl Viro if (ret) 459a22285a6SYan, Zheng return ret; 4606a912213SJosef Bacik 461e09fe2d2SQu Wenruo /* 462e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 463e09fe2d2SQu Wenruo * screwed up since it assume subvolme qgroup's level to be 0. 464e09fe2d2SQu Wenruo */ 465e09fe2d2SQu Wenruo if (btrfs_qgroup_level(objectid)) 466e09fe2d2SQu Wenruo return -ENOSPC; 467e09fe2d2SQu Wenruo 468d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4699ed74f2dSJosef Bacik /* 470d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 471d5c12070SMiao Xie * of create_snapshot(). 4729ed74f2dSJosef Bacik */ 473d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 474dd5f9615SStefan Behrens 8, &qgroup_reserved, false); 475d5c12070SMiao Xie if (ret) 476d5c12070SMiao Xie return ret; 477f46b5a66SChristoph Hellwig 478d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 479d5c12070SMiao Xie if (IS_ERR(trans)) { 480d5c12070SMiao Xie ret = PTR_ERR(trans); 481de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, 482de6e8200SLiu Bo qgroup_reserved); 483de6e8200SLiu Bo return ret; 484d5c12070SMiao Xie } 485d5c12070SMiao Xie trans->block_rsv = &block_rsv; 486d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 487f46b5a66SChristoph Hellwig 4888696c533SMiao Xie ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); 4896f72c7e2SArne Jansen if (ret) 4906f72c7e2SArne Jansen goto fail; 4916f72c7e2SArne Jansen 4924d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 4938e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4948e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4958e8a1e31SJosef Bacik goto fail; 4968e8a1e31SJosef Bacik } 497f46b5a66SChristoph Hellwig 4985d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 499f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 500f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 5015d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 502f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 503f46b5a66SChristoph Hellwig 5040a4e5586SRoss Kirk write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), 505f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 5065d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 507b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 5085d4f98a2SYan Zheng BTRFS_UUID_SIZE); 509f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 510f46b5a66SChristoph Hellwig 5118ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 5128ea05e3aSAlexander Block 513f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 5143cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5153cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5163cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 517707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 5183cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 519f46b5a66SChristoph Hellwig 5203cae210fSQu Wenruo btrfs_set_root_flags(&root_item, 0); 5213cae210fSQu Wenruo btrfs_set_root_limit(&root_item, 0); 5223cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 52308fe4db1SLi Zefan 524f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 52584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 526f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 527f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 52886b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 52980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 530f46b5a66SChristoph Hellwig 5318ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 5328ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 5338ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 5348ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 5353cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); 5363cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); 5378ea05e3aSAlexander Block root_item.ctime = root_item.otime; 5388ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 5398ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 540f46b5a66SChristoph Hellwig 541925baeddSChris Mason btrfs_tree_unlock(leaf); 542f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 543f46b5a66SChristoph Hellwig leaf = NULL; 544f46b5a66SChristoph Hellwig 545f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 546f46b5a66SChristoph Hellwig 547f46b5a66SChristoph Hellwig key.objectid = objectid; 5485d4f98a2SYan Zheng key.offset = 0; 549962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 550f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 551f46b5a66SChristoph Hellwig &root_item); 552f46b5a66SChristoph Hellwig if (ret) 553f46b5a66SChristoph Hellwig goto fail; 554f46b5a66SChristoph Hellwig 55576dda93cSYan, Zheng key.offset = (u64)-1; 55676dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 55779787eaaSJeff Mahoney if (IS_ERR(new_root)) { 55879787eaaSJeff Mahoney ret = PTR_ERR(new_root); 5596d13f549SDavid Sterba btrfs_abort_transaction(trans, root, ret); 56079787eaaSJeff Mahoney goto fail; 56179787eaaSJeff Mahoney } 56276dda93cSYan, Zheng 56376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 56476dda93cSYan, Zheng 56563541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 566ce598979SMark Fasheh if (ret) { 567ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 56879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 569ce598979SMark Fasheh goto fail; 570ce598979SMark Fasheh } 571ce598979SMark Fasheh 572f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 573f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 574f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 575f32e48e9SChandan Rajendra 576f46b5a66SChristoph Hellwig /* 577f46b5a66SChristoph Hellwig * insert the directory item 578f46b5a66SChristoph Hellwig */ 5793de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 58079787eaaSJeff Mahoney if (ret) { 58179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 58279787eaaSJeff Mahoney goto fail; 58379787eaaSJeff Mahoney } 5843de4586cSChris Mason 5853de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 58616cdcec7SMiao Xie name, namelen, dir, &key, 5873de4586cSChris Mason BTRFS_FT_DIR, index); 58879787eaaSJeff Mahoney if (ret) { 58979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 590f46b5a66SChristoph Hellwig goto fail; 59179787eaaSJeff Mahoney } 5920660b5afSChris Mason 59352c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 59452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 59552c26179SYan Zheng BUG_ON(ret); 59652c26179SYan Zheng 5970660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5984df27c4dSYan, Zheng objectid, root->root_key.objectid, 59933345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 6000660b5afSChris Mason BUG_ON(ret); 6010660b5afSChris Mason 602dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 603dd5f9615SStefan Behrens root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 604dd5f9615SStefan Behrens objectid); 605dd5f9615SStefan Behrens if (ret) 606dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 607dd5f9615SStefan Behrens 608f46b5a66SChristoph Hellwig fail: 609d5c12070SMiao Xie trans->block_rsv = NULL; 610d5c12070SMiao Xie trans->bytes_reserved = 0; 611de6e8200SLiu Bo btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 612de6e8200SLiu Bo 61372fd032eSSage Weil if (async_transid) { 61472fd032eSSage Weil *async_transid = trans->transid; 61572fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 61600d71c9cSMiao Xie if (err) 61700d71c9cSMiao Xie err = btrfs_commit_transaction(trans, root); 61872fd032eSSage Weil } else { 61976dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 62072fd032eSSage Weil } 621f46b5a66SChristoph Hellwig if (err && !ret) 622f46b5a66SChristoph Hellwig ret = err; 6231a65e24bSChris Mason 6245662344bSTsutomu Itoh if (!ret) { 6255662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 626de6e8200SLiu Bo if (IS_ERR(inode)) 627de6e8200SLiu Bo return PTR_ERR(inode); 6285662344bSTsutomu Itoh d_instantiate(dentry, inode); 6295662344bSTsutomu Itoh } 630f46b5a66SChristoph Hellwig return ret; 631f46b5a66SChristoph Hellwig } 632f46b5a66SChristoph Hellwig 6339ea24bbeSFilipe Manana static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) 6348257b2dcSMiao Xie { 6358257b2dcSMiao Xie s64 writers; 6368257b2dcSMiao Xie DEFINE_WAIT(wait); 6378257b2dcSMiao Xie 6388257b2dcSMiao Xie do { 6398257b2dcSMiao Xie prepare_to_wait(&root->subv_writers->wait, &wait, 6408257b2dcSMiao Xie TASK_UNINTERRUPTIBLE); 6418257b2dcSMiao Xie 6428257b2dcSMiao Xie writers = percpu_counter_sum(&root->subv_writers->counter); 6438257b2dcSMiao Xie if (writers) 6448257b2dcSMiao Xie schedule(); 6458257b2dcSMiao Xie 6468257b2dcSMiao Xie finish_wait(&root->subv_writers->wait, &wait); 6478257b2dcSMiao Xie } while (writers); 6488257b2dcSMiao Xie } 6498257b2dcSMiao Xie 650e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 651e9662f70SMiao Xie struct dentry *dentry, char *name, int namelen, 652e9662f70SMiao Xie u64 *async_transid, bool readonly, 653e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 654f46b5a66SChristoph Hellwig { 6552e4bfab9SYan, Zheng struct inode *inode; 656f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 657f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6582e4bfab9SYan, Zheng int ret; 659f46b5a66SChristoph Hellwig 66027cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 661f46b5a66SChristoph Hellwig return -EINVAL; 662f46b5a66SChristoph Hellwig 663a1ee7362SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 664a1ee7362SDavid Sterba if (!pending_snapshot) 665a1ee7362SDavid Sterba return -ENOMEM; 666a1ee7362SDavid Sterba 667b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 668b0c0ea63SDavid Sterba GFP_NOFS); 6698546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 6708546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 671b0c0ea63SDavid Sterba ret = -ENOMEM; 672b0c0ea63SDavid Sterba goto free_pending; 673b0c0ea63SDavid Sterba } 674b0c0ea63SDavid Sterba 6758257b2dcSMiao Xie atomic_inc(&root->will_be_snapshoted); 6764e857c58SPeter Zijlstra smp_mb__after_atomic(); 6779ea24bbeSFilipe Manana btrfs_wait_for_no_snapshoting_writes(root); 6788257b2dcSMiao Xie 6796a03843dSMiao Xie ret = btrfs_start_delalloc_inodes(root, 0); 6806a03843dSMiao Xie if (ret) 681a1ee7362SDavid Sterba goto dec_and_free; 6826a03843dSMiao Xie 683b0244199SMiao Xie btrfs_wait_ordered_extents(root, -1); 6846a03843dSMiao Xie 68566d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 68666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 687d5c12070SMiao Xie /* 688d5c12070SMiao Xie * 1 - parent dir inode 689d5c12070SMiao Xie * 2 - dir entries 690d5c12070SMiao Xie * 1 - root item 691d5c12070SMiao Xie * 2 - root ref/backref 692d5c12070SMiao Xie * 1 - root of snapshot 693dd5f9615SStefan Behrens * 1 - UUID item 694d5c12070SMiao Xie */ 695d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 696dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 697ee3441b4SJeff Mahoney &pending_snapshot->qgroup_reserved, 698ee3441b4SJeff Mahoney false); 699d5c12070SMiao Xie if (ret) 700a1ee7362SDavid Sterba goto dec_and_free; 701d5c12070SMiao Xie 702a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 703a22285a6SYan, Zheng pending_snapshot->root = root; 704b83cc969SLi Zefan pending_snapshot->readonly = readonly; 705e9662f70SMiao Xie pending_snapshot->dir = dir; 7068696c533SMiao Xie pending_snapshot->inherit = inherit; 707a22285a6SYan, Zheng 708d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 709a22285a6SYan, Zheng if (IS_ERR(trans)) { 710a22285a6SYan, Zheng ret = PTR_ERR(trans); 711a22285a6SYan, Zheng goto fail; 712a22285a6SYan, Zheng } 713a22285a6SYan, Zheng 7148351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 715a22285a6SYan, Zheng list_add(&pending_snapshot->list, 716a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7178351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 71872fd032eSSage Weil if (async_transid) { 71972fd032eSSage Weil *async_transid = trans->transid; 72072fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 72172fd032eSSage Weil root->fs_info->extent_root, 1); 72200d71c9cSMiao Xie if (ret) 72300d71c9cSMiao Xie ret = btrfs_commit_transaction(trans, root); 72472fd032eSSage Weil } else { 72572fd032eSSage Weil ret = btrfs_commit_transaction(trans, 72672fd032eSSage Weil root->fs_info->extent_root); 72772fd032eSSage Weil } 728aec8030aSMiao Xie if (ret) 729c37b2b62SJosef Bacik goto fail; 730a22285a6SYan, Zheng 731a22285a6SYan, Zheng ret = pending_snapshot->error; 732f46b5a66SChristoph Hellwig if (ret) 7332e4bfab9SYan, Zheng goto fail; 734f46b5a66SChristoph Hellwig 735d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 736d3797308SChris Mason if (ret) 737d3797308SChris Mason goto fail; 738d3797308SChris Mason 7392b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7402e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7412e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7422e4bfab9SYan, Zheng goto fail; 7432e4bfab9SYan, Zheng } 7445662344bSTsutomu Itoh 7452e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7462e4bfab9SYan, Zheng ret = 0; 7472e4bfab9SYan, Zheng fail: 748d5c12070SMiao Xie btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, 749d5c12070SMiao Xie &pending_snapshot->block_rsv, 750d5c12070SMiao Xie pending_snapshot->qgroup_reserved); 751a1ee7362SDavid Sterba dec_and_free: 7529ea24bbeSFilipe Manana if (atomic_dec_and_test(&root->will_be_snapshoted)) 7539ea24bbeSFilipe Manana wake_up_atomic_t(&root->will_be_snapshoted); 754b0c0ea63SDavid Sterba free_pending: 755b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 7568546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 757a1ee7362SDavid Sterba kfree(pending_snapshot); 758a1ee7362SDavid Sterba 759f46b5a66SChristoph Hellwig return ret; 760f46b5a66SChristoph Hellwig } 761f46b5a66SChristoph Hellwig 7624260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7634260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7644260f7c7SSage Weil * whether the type of victim is right. 7654260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7664260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7674260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7684260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7694260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7704260f7c7SSage Weil * a. be owner of dir, or 7714260f7c7SSage Weil * b. be owner of victim, or 7724260f7c7SSage Weil * c. have CAP_FOWNER capability 7734260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 7744260f7c7SSage Weil * links pointing to it. 7754260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7764260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7774260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7784260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7794260f7c7SSage Weil * nfs_async_unlink(). 7804260f7c7SSage Weil */ 7814260f7c7SSage Weil 7824260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7834260f7c7SSage Weil { 7844260f7c7SSage Weil int error; 7854260f7c7SSage Weil 7862b0143b5SDavid Howells if (d_really_is_negative(victim)) 7874260f7c7SSage Weil return -ENOENT; 7884260f7c7SSage Weil 7892b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 7904fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 7914260f7c7SSage Weil 7924260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 7934260f7c7SSage Weil if (error) 7944260f7c7SSage Weil return error; 7954260f7c7SSage Weil if (IS_APPEND(dir)) 7964260f7c7SSage Weil return -EPERM; 7972b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 7982b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 7994260f7c7SSage Weil return -EPERM; 8004260f7c7SSage Weil if (isdir) { 801e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8024260f7c7SSage Weil return -ENOTDIR; 8034260f7c7SSage Weil if (IS_ROOT(victim)) 8044260f7c7SSage Weil return -EBUSY; 805e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8064260f7c7SSage Weil return -EISDIR; 8074260f7c7SSage Weil if (IS_DEADDIR(dir)) 8084260f7c7SSage Weil return -ENOENT; 8094260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8104260f7c7SSage Weil return -EBUSY; 8114260f7c7SSage Weil return 0; 8124260f7c7SSage Weil } 8134260f7c7SSage Weil 814cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 815cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 816cb8e7090SChristoph Hellwig { 8172b0143b5SDavid Howells if (d_really_is_positive(child)) 818cb8e7090SChristoph Hellwig return -EEXIST; 819cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 820cb8e7090SChristoph Hellwig return -ENOENT; 821cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 822cb8e7090SChristoph Hellwig } 823cb8e7090SChristoph Hellwig 824cb8e7090SChristoph Hellwig /* 825cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 826cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 827cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 828cb8e7090SChristoph Hellwig */ 82976dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 83076dda93cSYan, Zheng char *name, int namelen, 83172fd032eSSage Weil struct btrfs_root *snap_src, 8326f72c7e2SArne Jansen u64 *async_transid, bool readonly, 8338696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 834cb8e7090SChristoph Hellwig { 8352b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 836cb8e7090SChristoph Hellwig struct dentry *dentry; 837cb8e7090SChristoph Hellwig int error; 838cb8e7090SChristoph Hellwig 8395c50c9b8SDavid Sterba error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 8405c50c9b8SDavid Sterba if (error == -EINTR) 8415c50c9b8SDavid Sterba return error; 842cb8e7090SChristoph Hellwig 843cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 844cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 845cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 846cb8e7090SChristoph Hellwig goto out_unlock; 847cb8e7090SChristoph Hellwig 84876dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 849cb8e7090SChristoph Hellwig if (error) 850a874a63eSLiu Bo goto out_dput; 851cb8e7090SChristoph Hellwig 8529c52057cSChris Mason /* 8539c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8549c52057cSChris Mason * check for them now when we can safely fail 8559c52057cSChris Mason */ 8569c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8579c52057cSChris Mason dir->i_ino, name, 8589c52057cSChris Mason namelen); 8599c52057cSChris Mason if (error) 8609c52057cSChris Mason goto out_dput; 8619c52057cSChris Mason 86276dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 86376dda93cSYan, Zheng 86476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 86576dda93cSYan, Zheng goto out_up_read; 86676dda93cSYan, Zheng 8673de4586cSChris Mason if (snap_src) { 868e9662f70SMiao Xie error = create_snapshot(snap_src, dir, dentry, name, namelen, 8696f72c7e2SArne Jansen async_transid, readonly, inherit); 8703de4586cSChris Mason } else { 871d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 872d5c12070SMiao Xie async_transid, inherit); 8733de4586cSChris Mason } 87476dda93cSYan, Zheng if (!error) 87576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 87676dda93cSYan, Zheng out_up_read: 87776dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 878cb8e7090SChristoph Hellwig out_dput: 879cb8e7090SChristoph Hellwig dput(dentry); 880cb8e7090SChristoph Hellwig out_unlock: 8815955102cSAl Viro inode_unlock(dir); 882cb8e7090SChristoph Hellwig return error; 883cb8e7090SChristoph Hellwig } 884cb8e7090SChristoph Hellwig 8854cb5300bSChris Mason /* 8864cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 8874cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 8884cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 8894cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 8904cb5300bSChris Mason * part of the file 8914cb5300bSChris Mason */ 892aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 8934cb5300bSChris Mason { 8944cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8954cb5300bSChris Mason struct extent_map *em = NULL; 8964cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 8974cb5300bSChris Mason u64 end; 8984cb5300bSChris Mason 8994cb5300bSChris Mason read_lock(&em_tree->lock); 9004cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 9014cb5300bSChris Mason read_unlock(&em_tree->lock); 9024cb5300bSChris Mason 9034cb5300bSChris Mason if (em) { 9044cb5300bSChris Mason end = extent_map_end(em); 9054cb5300bSChris Mason free_extent_map(em); 9064cb5300bSChris Mason if (end - offset > thresh) 9074cb5300bSChris Mason return 0; 9084cb5300bSChris Mason } 9094cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9104cb5300bSChris Mason thresh /= 2; 9114cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9124cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9134cb5300bSChris Mason if (end >= thresh) 9144cb5300bSChris Mason return 0; 9154cb5300bSChris Mason return 1; 9164cb5300bSChris Mason } 9174cb5300bSChris Mason 9184cb5300bSChris Mason /* 9194cb5300bSChris Mason * helper function to walk through a file and find extents 9204cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9214cb5300bSChris Mason * 9224cb5300bSChris Mason * This is used by the defragging code to find new and small 9234cb5300bSChris Mason * extents 9244cb5300bSChris Mason */ 9254cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9264cb5300bSChris Mason struct inode *inode, u64 newer_than, 927aab110abSDavid Sterba u64 *off, u32 thresh) 9284cb5300bSChris Mason { 9294cb5300bSChris Mason struct btrfs_path *path; 9304cb5300bSChris Mason struct btrfs_key min_key; 9314cb5300bSChris Mason struct extent_buffer *leaf; 9324cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9334cb5300bSChris Mason int type; 9344cb5300bSChris Mason int ret; 935a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 9364cb5300bSChris Mason 9374cb5300bSChris Mason path = btrfs_alloc_path(); 9384cb5300bSChris Mason if (!path) 9394cb5300bSChris Mason return -ENOMEM; 9404cb5300bSChris Mason 941a4689d2bSDavid Sterba min_key.objectid = ino; 9424cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9434cb5300bSChris Mason min_key.offset = *off; 9444cb5300bSChris Mason 9454cb5300bSChris Mason while (1) { 9466174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9474cb5300bSChris Mason if (ret != 0) 9484cb5300bSChris Mason goto none; 949f094c9bdSFilipe Manana process_slot: 950a4689d2bSDavid Sterba if (min_key.objectid != ino) 9514cb5300bSChris Mason goto none; 9524cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 9534cb5300bSChris Mason goto none; 9544cb5300bSChris Mason 9554cb5300bSChris Mason leaf = path->nodes[0]; 9564cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 9574cb5300bSChris Mason struct btrfs_file_extent_item); 9584cb5300bSChris Mason 9594cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 9604cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 9614cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 9624cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 9634cb5300bSChris Mason *off = min_key.offset; 9644cb5300bSChris Mason btrfs_free_path(path); 9654cb5300bSChris Mason return 0; 9664cb5300bSChris Mason } 9674cb5300bSChris Mason 968f094c9bdSFilipe Manana path->slots[0]++; 969f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 970f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 971f094c9bdSFilipe Manana goto process_slot; 972f094c9bdSFilipe Manana } 973f094c9bdSFilipe Manana 9744cb5300bSChris Mason if (min_key.offset == (u64)-1) 9754cb5300bSChris Mason goto none; 9764cb5300bSChris Mason 9774cb5300bSChris Mason min_key.offset++; 9784cb5300bSChris Mason btrfs_release_path(path); 9794cb5300bSChris Mason } 9804cb5300bSChris Mason none: 9814cb5300bSChris Mason btrfs_free_path(path); 9824cb5300bSChris Mason return -ENOENT; 9834cb5300bSChris Mason } 9844cb5300bSChris Mason 9856c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 98617ce6ef8SLiu Bo { 98717ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 988940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9896c282eb4SLi Zefan struct extent_map *em; 9906c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 991940100a4SChris Mason 992940100a4SChris Mason /* 993940100a4SChris Mason * hopefully we have this extent in the tree already, try without 994940100a4SChris Mason * the full extent lock 995940100a4SChris Mason */ 996940100a4SChris Mason read_lock(&em_tree->lock); 997940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 998940100a4SChris Mason read_unlock(&em_tree->lock); 999940100a4SChris Mason 1000940100a4SChris Mason if (!em) { 1001308d9800SFilipe Manana struct extent_state *cached = NULL; 1002308d9800SFilipe Manana u64 end = start + len - 1; 1003308d9800SFilipe Manana 1004940100a4SChris Mason /* get the big lock and read metadata off disk */ 1005ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1006940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 1007308d9800SFilipe Manana unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); 1008940100a4SChris Mason 10096cf8bfbfSDan Carpenter if (IS_ERR(em)) 10106c282eb4SLi Zefan return NULL; 1011940100a4SChris Mason } 1012940100a4SChris Mason 10136c282eb4SLi Zefan return em; 10146c282eb4SLi Zefan } 10156c282eb4SLi Zefan 10166c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10176c282eb4SLi Zefan { 10186c282eb4SLi Zefan struct extent_map *next; 10196c282eb4SLi Zefan bool ret = true; 10206c282eb4SLi Zefan 10216c282eb4SLi Zefan /* this is the last extent */ 10226c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10236c282eb4SLi Zefan return false; 10246c282eb4SLi Zefan 10256c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1026e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1027e9512d72SChris Mason ret = false; 1028e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1029ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 10306c282eb4SLi Zefan ret = false; 10316c282eb4SLi Zefan 10326c282eb4SLi Zefan free_extent_map(next); 10336c282eb4SLi Zefan return ret; 10346c282eb4SLi Zefan } 10356c282eb4SLi Zefan 1036aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1037a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1038a43a2111SAndrew Mahone int compress) 10396c282eb4SLi Zefan { 10406c282eb4SLi Zefan struct extent_map *em; 10416c282eb4SLi Zefan int ret = 1; 10426c282eb4SLi Zefan bool next_mergeable = true; 10434a3560c4SLiu Bo bool prev_mergeable = true; 10446c282eb4SLi Zefan 10456c282eb4SLi Zefan /* 10466c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10476c282eb4SLi Zefan * defragging it 10486c282eb4SLi Zefan */ 10496c282eb4SLi Zefan if (start < *defrag_end) 10506c282eb4SLi Zefan return 1; 10516c282eb4SLi Zefan 10526c282eb4SLi Zefan *skip = 0; 10536c282eb4SLi Zefan 10546c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 10556c282eb4SLi Zefan if (!em) 10566c282eb4SLi Zefan return 0; 10576c282eb4SLi Zefan 1058940100a4SChris Mason /* this will cover holes, and inline extents */ 105917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1060940100a4SChris Mason ret = 0; 106117ce6ef8SLiu Bo goto out; 106217ce6ef8SLiu Bo } 106317ce6ef8SLiu Bo 10644a3560c4SLiu Bo if (!*defrag_end) 10654a3560c4SLiu Bo prev_mergeable = false; 10664a3560c4SLiu Bo 10676c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1068940100a4SChris Mason /* 10696c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 10706c282eb4SLi Zefan * real extent, don't bother defragging it 1071940100a4SChris Mason */ 1072a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 10734a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1074940100a4SChris Mason ret = 0; 107517ce6ef8SLiu Bo out: 1076940100a4SChris Mason /* 1077940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1078940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1079940100a4SChris Mason * so that the next tiny extent will force a defrag. 1080940100a4SChris Mason * 1081940100a4SChris Mason * The end result of this is that tiny extents before a single big 1082940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1083940100a4SChris Mason */ 1084940100a4SChris Mason if (ret) { 1085940100a4SChris Mason *defrag_end = extent_map_end(em); 1086940100a4SChris Mason } else { 1087940100a4SChris Mason *last_len = 0; 1088940100a4SChris Mason *skip = extent_map_end(em); 1089940100a4SChris Mason *defrag_end = 0; 1090940100a4SChris Mason } 1091940100a4SChris Mason 1092940100a4SChris Mason free_extent_map(em); 1093940100a4SChris Mason return ret; 1094940100a4SChris Mason } 1095940100a4SChris Mason 10964cb5300bSChris Mason /* 10974cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 10984cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 10994cb5300bSChris Mason * to COW and defrag. 11004cb5300bSChris Mason * 11014cb5300bSChris Mason * It also makes sure the delalloc code has enough 11024cb5300bSChris Mason * dirty data to avoid making new small extents as part 11034cb5300bSChris Mason * of the defrag 11044cb5300bSChris Mason * 11054cb5300bSChris Mason * It's a good idea to start RA on this range 11064cb5300bSChris Mason * before calling this. 11074cb5300bSChris Mason */ 11084cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11094cb5300bSChris Mason struct page **pages, 11104cb5300bSChris Mason unsigned long start_index, 1111c41570c9SJustin Maggard unsigned long num_pages) 1112f46b5a66SChristoph Hellwig { 11134cb5300bSChris Mason unsigned long file_end; 11144cb5300bSChris Mason u64 isize = i_size_read(inode); 1115f46b5a66SChristoph Hellwig u64 page_start; 1116f46b5a66SChristoph Hellwig u64 page_end; 11171f12bd06SLiu Bo u64 page_cnt; 11184cb5300bSChris Mason int ret; 11194cb5300bSChris Mason int i; 11204cb5300bSChris Mason int i_done; 11214cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11224cb5300bSChris Mason struct extent_state *cached_state = NULL; 1123600a45e1SMiao Xie struct extent_io_tree *tree; 11243b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11254cb5300bSChris Mason 11264cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 11271f12bd06SLiu Bo if (!isize || start_index > file_end) 11281f12bd06SLiu Bo return 0; 11291f12bd06SLiu Bo 11301f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11314cb5300bSChris Mason 11324cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 1133df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 11341f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 11354cb5300bSChris Mason if (ret) 11364cb5300bSChris Mason return ret; 11374cb5300bSChris Mason i_done = 0; 1138600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11394cb5300bSChris Mason 11404cb5300bSChris Mason /* step one, lock all the pages */ 11411f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11424cb5300bSChris Mason struct page *page; 1143600a45e1SMiao Xie again: 1144a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11453b16a4e3SJosef Bacik start_index + i, mask); 11464cb5300bSChris Mason if (!page) 11474cb5300bSChris Mason break; 11484cb5300bSChris Mason 1149600a45e1SMiao Xie page_start = page_offset(page); 1150600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 1151600a45e1SMiao Xie while (1) { 1152308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1153ff13db41SDavid Sterba &cached_state); 1154600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1155600a45e1SMiao Xie page_start); 1156308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1157308d9800SFilipe Manana &cached_state, GFP_NOFS); 1158600a45e1SMiao Xie if (!ordered) 1159600a45e1SMiao Xie break; 1160600a45e1SMiao Xie 1161600a45e1SMiao Xie unlock_page(page); 1162600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1163600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1164600a45e1SMiao Xie lock_page(page); 11651f12bd06SLiu Bo /* 11661f12bd06SLiu Bo * we unlocked the page above, so we need check if 11671f12bd06SLiu Bo * it was released or not. 11681f12bd06SLiu Bo */ 11691f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 11701f12bd06SLiu Bo unlock_page(page); 11711f12bd06SLiu Bo page_cache_release(page); 11721f12bd06SLiu Bo goto again; 11731f12bd06SLiu Bo } 1174600a45e1SMiao Xie } 1175600a45e1SMiao Xie 11764cb5300bSChris Mason if (!PageUptodate(page)) { 11774cb5300bSChris Mason btrfs_readpage(NULL, page); 11784cb5300bSChris Mason lock_page(page); 11794cb5300bSChris Mason if (!PageUptodate(page)) { 11804cb5300bSChris Mason unlock_page(page); 11814cb5300bSChris Mason page_cache_release(page); 11824cb5300bSChris Mason ret = -EIO; 11834cb5300bSChris Mason break; 11844cb5300bSChris Mason } 11854cb5300bSChris Mason } 1186600a45e1SMiao Xie 1187600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1188600a45e1SMiao Xie unlock_page(page); 1189600a45e1SMiao Xie page_cache_release(page); 1190600a45e1SMiao Xie goto again; 1191600a45e1SMiao Xie } 1192600a45e1SMiao Xie 11934cb5300bSChris Mason pages[i] = page; 11944cb5300bSChris Mason i_done++; 11954cb5300bSChris Mason } 11964cb5300bSChris Mason if (!i_done || ret) 11974cb5300bSChris Mason goto out; 11984cb5300bSChris Mason 11994cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 12004cb5300bSChris Mason goto out; 12014cb5300bSChris Mason 12024cb5300bSChris Mason /* 12034cb5300bSChris Mason * so now we have a nice long stream of locked 12044cb5300bSChris Mason * and up to date pages, lets wait on them 12054cb5300bSChris Mason */ 12064cb5300bSChris Mason for (i = 0; i < i_done; i++) 12074cb5300bSChris Mason wait_on_page_writeback(pages[i]); 12084cb5300bSChris Mason 12094cb5300bSChris Mason page_start = page_offset(pages[0]); 12104cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 12114cb5300bSChris Mason 12124cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1213ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 12144cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 12154cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 12169e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 12179e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12184cb5300bSChris Mason 12191f12bd06SLiu Bo if (i_done != page_cnt) { 12209e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 12219e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 12229e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 12234cb5300bSChris Mason btrfs_delalloc_release_space(inode, 1224df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 12251f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 12264cb5300bSChris Mason } 12274cb5300bSChris Mason 12284cb5300bSChris Mason 12299e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 12309e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 12314cb5300bSChris Mason 12324cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 12334cb5300bSChris Mason page_start, page_end - 1, &cached_state, 12344cb5300bSChris Mason GFP_NOFS); 12354cb5300bSChris Mason 12364cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12374cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 12384cb5300bSChris Mason ClearPageChecked(pages[i]); 12394cb5300bSChris Mason set_page_extent_mapped(pages[i]); 12404cb5300bSChris Mason set_page_dirty(pages[i]); 12414cb5300bSChris Mason unlock_page(pages[i]); 12424cb5300bSChris Mason page_cache_release(pages[i]); 12434cb5300bSChris Mason } 12444cb5300bSChris Mason return i_done; 12454cb5300bSChris Mason out: 12464cb5300bSChris Mason for (i = 0; i < i_done; i++) { 12474cb5300bSChris Mason unlock_page(pages[i]); 12484cb5300bSChris Mason page_cache_release(pages[i]); 12494cb5300bSChris Mason } 12507cf5b976SQu Wenruo btrfs_delalloc_release_space(inode, 1251df480633SQu Wenruo start_index << PAGE_CACHE_SHIFT, 1252df480633SQu Wenruo page_cnt << PAGE_CACHE_SHIFT); 12534cb5300bSChris Mason return ret; 12544cb5300bSChris Mason 12554cb5300bSChris Mason } 12564cb5300bSChris Mason 12574cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 12584cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 12594cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 12604cb5300bSChris Mason { 12614cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 12624cb5300bSChris Mason struct file_ra_state *ra = NULL; 12634cb5300bSChris Mason unsigned long last_index; 1264151a31b2SLi Zefan u64 isize = i_size_read(inode); 1265940100a4SChris Mason u64 last_len = 0; 1266940100a4SChris Mason u64 skip = 0; 1267940100a4SChris Mason u64 defrag_end = 0; 12684cb5300bSChris Mason u64 newer_off = range->start; 1269f46b5a66SChristoph Hellwig unsigned long i; 1270008873eaSLi Zefan unsigned long ra_index = 0; 1271f46b5a66SChristoph Hellwig int ret; 12724cb5300bSChris Mason int defrag_count = 0; 12731a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1274aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 1275ee22184bSByongho Lee unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT; 1276c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1277ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 12784cb5300bSChris Mason struct page **pages = NULL; 12794cb5300bSChris Mason 12800abd5b17SLiu Bo if (isize == 0) 12810abd5b17SLiu Bo return 0; 12820abd5b17SLiu Bo 12830abd5b17SLiu Bo if (range->start >= isize) 12840abd5b17SLiu Bo return -EINVAL; 12851a419d85SLi Zefan 12861a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 12871a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 12881a419d85SLi Zefan return -EINVAL; 12891a419d85SLi Zefan if (range->compress_type) 12901a419d85SLi Zefan compress_type = range->compress_type; 12911a419d85SLi Zefan } 1292f46b5a66SChristoph Hellwig 12930abd5b17SLiu Bo if (extent_thresh == 0) 1294ee22184bSByongho Lee extent_thresh = SZ_256K; 1295f46b5a66SChristoph Hellwig 12964cb5300bSChris Mason /* 12974cb5300bSChris Mason * if we were not given a file, allocate a readahead 12984cb5300bSChris Mason * context 12994cb5300bSChris Mason */ 13004cb5300bSChris Mason if (!file) { 13014cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 13024cb5300bSChris Mason if (!ra) 13034cb5300bSChris Mason return -ENOMEM; 13044cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 13054cb5300bSChris Mason } else { 13064cb5300bSChris Mason ra = &file->f_ra; 13074cb5300bSChris Mason } 13084cb5300bSChris Mason 1309d9b0d9baSDulshani Gunawardhana pages = kmalloc_array(max_cluster, sizeof(struct page *), 13104cb5300bSChris Mason GFP_NOFS); 13114cb5300bSChris Mason if (!pages) { 13124cb5300bSChris Mason ret = -ENOMEM; 13134cb5300bSChris Mason goto out_ra; 13144cb5300bSChris Mason } 13154cb5300bSChris Mason 13164cb5300bSChris Mason /* find the last page to defrag */ 13171e701a32SChris Mason if (range->start + range->len > range->start) { 1318151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 13191e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 13201e701a32SChris Mason } else { 1321151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 13221e701a32SChris Mason } 13231e701a32SChris Mason 13244cb5300bSChris Mason if (newer_than) { 13254cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1326ee22184bSByongho Lee &newer_off, SZ_64K); 13274cb5300bSChris Mason if (!ret) { 13284cb5300bSChris Mason range->start = newer_off; 13294cb5300bSChris Mason /* 13304cb5300bSChris Mason * we always align our defrag to help keep 13314cb5300bSChris Mason * the extents in the file evenly spaced 13324cb5300bSChris Mason */ 13334cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 13344cb5300bSChris Mason } else 13354cb5300bSChris Mason goto out_ra; 13364cb5300bSChris Mason } else { 13371e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 13384cb5300bSChris Mason } 13394cb5300bSChris Mason if (!max_to_defrag) 1340070034bdSchandan max_to_defrag = last_index - i + 1; 13414cb5300bSChris Mason 13422a0f7f57SLi Zefan /* 13432a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 13442a0f7f57SLi Zefan * written sequentially. 13452a0f7f57SLi Zefan */ 13462a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 13472a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 13482a0f7f57SLi Zefan 1349f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1350ed6078f7SDavid Sterba (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { 13514cb5300bSChris Mason /* 13524cb5300bSChris Mason * make sure we stop running if someone unmounts 13534cb5300bSChris Mason * the FS 13544cb5300bSChris Mason */ 13554cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 13564cb5300bSChris Mason break; 13574cb5300bSChris Mason 1358210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1359f14d104dSDavid Sterba btrfs_debug(root->fs_info, "defrag_file cancelled"); 1360210549ebSDavid Sterba ret = -EAGAIN; 1361210549ebSDavid Sterba break; 1362210549ebSDavid Sterba } 1363210549ebSDavid Sterba 136466c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 13656c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1366a43a2111SAndrew Mahone &defrag_end, range->flags & 1367a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1368940100a4SChris Mason unsigned long next; 1369940100a4SChris Mason /* 1370940100a4SChris Mason * the should_defrag function tells us how much to skip 1371940100a4SChris Mason * bump our counter by the suggested amount 1372940100a4SChris Mason */ 1373ed6078f7SDavid Sterba next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); 1374940100a4SChris Mason i = max(i + 1, next); 1375940100a4SChris Mason continue; 1376940100a4SChris Mason } 1377008873eaSLi Zefan 1378008873eaSLi Zefan if (!newer_than) { 1379008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1380008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1381008873eaSLi Zefan cluster = min(cluster, max_cluster); 1382008873eaSLi Zefan } else { 1383008873eaSLi Zefan cluster = max_cluster; 1384008873eaSLi Zefan } 1385008873eaSLi Zefan 1386008873eaSLi Zefan if (i + cluster > ra_index) { 1387008873eaSLi Zefan ra_index = max(i, ra_index); 1388008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1389008873eaSLi Zefan cluster); 1390e4826a5bSchandan ra_index += cluster; 1391008873eaSLi Zefan } 13924cb5300bSChris Mason 13935955102cSAl Viro inode_lock(inode); 1394633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 1395633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = compress_type; 1396008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1397ecb8bea8SLiu Bo if (ret < 0) { 13985955102cSAl Viro inode_unlock(inode); 13994cb5300bSChris Mason goto out_ra; 1400ecb8bea8SLiu Bo } 14014cb5300bSChris Mason 14024cb5300bSChris Mason defrag_count += ret; 1403d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 14045955102cSAl Viro inode_unlock(inode); 14054cb5300bSChris Mason 14064cb5300bSChris Mason if (newer_than) { 14074cb5300bSChris Mason if (newer_off == (u64)-1) 14084cb5300bSChris Mason break; 14094cb5300bSChris Mason 1410e1f041e1SLiu Bo if (ret > 0) 1411e1f041e1SLiu Bo i += ret; 1412e1f041e1SLiu Bo 14134cb5300bSChris Mason newer_off = max(newer_off + 1, 14144cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 14154cb5300bSChris Mason 1416ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1417ee22184bSByongho Lee &newer_off, SZ_64K); 14184cb5300bSChris Mason if (!ret) { 14194cb5300bSChris Mason range->start = newer_off; 14204cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 14214cb5300bSChris Mason } else { 14224cb5300bSChris Mason break; 1423940100a4SChris Mason } 14244cb5300bSChris Mason } else { 1425008873eaSLi Zefan if (ret > 0) { 1426cbcc8326SLi Zefan i += ret; 1427008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1428008873eaSLi Zefan } else { 1429940100a4SChris Mason i++; 1430008873eaSLi Zefan last_len = 0; 1431008873eaSLi Zefan } 1432f46b5a66SChristoph Hellwig } 14334cb5300bSChris Mason } 1434f46b5a66SChristoph Hellwig 1435dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 14361e701a32SChris Mason filemap_flush(inode->i_mapping); 1437dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1438dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1439dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1440dec8ef90SFilipe Manana } 14411e701a32SChris Mason 14421e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 14431e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 14441e701a32SChris Mason * we have to make sure the IO is actually started and that 14451e701a32SChris Mason * ordered extents get created before we return 14461e701a32SChris Mason */ 14471e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 14481e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 14491e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 14501e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 14511e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 14521e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 14531e701a32SChris Mason } 14541e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 14551e701a32SChris Mason } 14561e701a32SChris Mason 14571a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 14582b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 14591a419d85SLi Zefan } 14601a419d85SLi Zefan 146160ccf82fSDiego Calleja ret = defrag_count; 1462940100a4SChris Mason 14634cb5300bSChris Mason out_ra: 1464633085c7SFilipe David Borba Manana if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 14655955102cSAl Viro inode_lock(inode); 1466633085c7SFilipe David Borba Manana BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 14675955102cSAl Viro inode_unlock(inode); 1468633085c7SFilipe David Borba Manana } 14694cb5300bSChris Mason if (!file) 14704cb5300bSChris Mason kfree(ra); 14714cb5300bSChris Mason kfree(pages); 1472940100a4SChris Mason return ret; 1473f46b5a66SChristoph Hellwig } 1474f46b5a66SChristoph Hellwig 1475198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 147676dda93cSYan, Zheng void __user *arg) 1477f46b5a66SChristoph Hellwig { 1478f46b5a66SChristoph Hellwig u64 new_size; 1479f46b5a66SChristoph Hellwig u64 old_size; 1480f46b5a66SChristoph Hellwig u64 devid = 1; 1481496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 1482f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1483f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1484f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1485f46b5a66SChristoph Hellwig char *sizestr; 14869a40f122SGui Hecheng char *retptr; 1487f46b5a66SChristoph Hellwig char *devstr = NULL; 1488f46b5a66SChristoph Hellwig int ret = 0; 1489f46b5a66SChristoph Hellwig int mod = 0; 1490f46b5a66SChristoph Hellwig 1491e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1492e441d54dSChris Mason return -EPERM; 1493e441d54dSChris Mason 1494198605a8SMiao Xie ret = mnt_want_write_file(file); 1495198605a8SMiao Xie if (ret) 1496198605a8SMiao Xie return ret; 1497198605a8SMiao Xie 14985ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 14995ac00addSStefan Behrens 1)) { 150097547676SMiao Xie mnt_drop_write_file(file); 1501e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1502c9e9f97bSIlya Dryomov } 1503c9e9f97bSIlya Dryomov 15045ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 1505dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1506c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1507c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1508c9e9f97bSIlya Dryomov goto out; 1509c9e9f97bSIlya Dryomov } 15105516e595SMark Fasheh 15115516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1512f46b5a66SChristoph Hellwig 1513f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1514f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1515f46b5a66SChristoph Hellwig if (devstr) { 1516f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1517f46b5a66SChristoph Hellwig *devstr = '\0'; 1518f46b5a66SChristoph Hellwig devstr = vol_args->name; 151958dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 152058dfae63SZhangZhen if (ret) 152158dfae63SZhangZhen goto out_free; 1522dfd79829SMiao Xie if (!devid) { 1523dfd79829SMiao Xie ret = -EINVAL; 1524dfd79829SMiao Xie goto out_free; 1525dfd79829SMiao Xie } 1526efe120a0SFrank Holton btrfs_info(root->fs_info, "resizing devid %llu", devid); 1527f46b5a66SChristoph Hellwig } 1528dba60f3fSMiao Xie 1529aa1b8cd4SStefan Behrens device = btrfs_find_device(root->fs_info, devid, NULL, NULL); 1530f46b5a66SChristoph Hellwig if (!device) { 1531efe120a0SFrank Holton btrfs_info(root->fs_info, "resizer unable to find device %llu", 1532c1c9ff7cSGeert Uytterhoeven devid); 1533dfd79829SMiao Xie ret = -ENODEV; 1534c9e9f97bSIlya Dryomov goto out_free; 1535f46b5a66SChristoph Hellwig } 1536dba60f3fSMiao Xie 1537dba60f3fSMiao Xie if (!device->writeable) { 1538efe120a0SFrank Holton btrfs_info(root->fs_info, 1539efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1540c1c9ff7cSGeert Uytterhoeven devid); 1541dfd79829SMiao Xie ret = -EPERM; 15424e42ae1bSLiu Bo goto out_free; 15434e42ae1bSLiu Bo } 15444e42ae1bSLiu Bo 1545f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1546f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1547f46b5a66SChristoph Hellwig else { 1548f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1549f46b5a66SChristoph Hellwig mod = -1; 1550f46b5a66SChristoph Hellwig sizestr++; 1551f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1552f46b5a66SChristoph Hellwig mod = 1; 1553f46b5a66SChristoph Hellwig sizestr++; 1554f46b5a66SChristoph Hellwig } 15559a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 15569a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1557f46b5a66SChristoph Hellwig ret = -EINVAL; 1558c9e9f97bSIlya Dryomov goto out_free; 1559f46b5a66SChristoph Hellwig } 1560f46b5a66SChristoph Hellwig } 1561f46b5a66SChristoph Hellwig 156263a212abSStefan Behrens if (device->is_tgtdev_for_dev_replace) { 1563dfd79829SMiao Xie ret = -EPERM; 156463a212abSStefan Behrens goto out_free; 156563a212abSStefan Behrens } 156663a212abSStefan Behrens 15677cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1568f46b5a66SChristoph Hellwig 1569f46b5a66SChristoph Hellwig if (mod < 0) { 1570f46b5a66SChristoph Hellwig if (new_size > old_size) { 1571f46b5a66SChristoph Hellwig ret = -EINVAL; 1572c9e9f97bSIlya Dryomov goto out_free; 1573f46b5a66SChristoph Hellwig } 1574f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1575f46b5a66SChristoph Hellwig } else if (mod > 0) { 1576eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1577902c68a4SGui Hecheng ret = -ERANGE; 1578eb8052e0SWenliang Fan goto out_free; 1579eb8052e0SWenliang Fan } 1580f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1581f46b5a66SChristoph Hellwig } 1582f46b5a66SChristoph Hellwig 1583ee22184bSByongho Lee if (new_size < SZ_256M) { 1584f46b5a66SChristoph Hellwig ret = -EINVAL; 1585c9e9f97bSIlya Dryomov goto out_free; 1586f46b5a66SChristoph Hellwig } 1587f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1588f46b5a66SChristoph Hellwig ret = -EFBIG; 1589c9e9f97bSIlya Dryomov goto out_free; 1590f46b5a66SChristoph Hellwig } 1591f46b5a66SChristoph Hellwig 1592b8b93addSDavid Sterba new_size = div_u64(new_size, root->sectorsize); 1593f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1594f46b5a66SChristoph Hellwig 1595ecaeb14bSDavid Sterba btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", 1596c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1597f46b5a66SChristoph Hellwig 1598f46b5a66SChristoph Hellwig if (new_size > old_size) { 1599a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 160098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 160198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1602c9e9f97bSIlya Dryomov goto out_free; 160398d5dc13STsutomu Itoh } 1604f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1605f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1606ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1607f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 16080253f40eSjeff.liu } /* equal, nothing need to do */ 1609f46b5a66SChristoph Hellwig 1610c9e9f97bSIlya Dryomov out_free: 1611f46b5a66SChristoph Hellwig kfree(vol_args); 1612c9e9f97bSIlya Dryomov out: 1613c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 16145ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 161518f39c41SIlya Dryomov mnt_drop_write_file(file); 1616f46b5a66SChristoph Hellwig return ret; 1617f46b5a66SChristoph Hellwig } 1618f46b5a66SChristoph Hellwig 161972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 16206f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 16216f72c7e2SArne Jansen u64 *transid, bool readonly, 16228696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1623f46b5a66SChristoph Hellwig { 1624f46b5a66SChristoph Hellwig int namelen; 16253de4586cSChris Mason int ret = 0; 1626f46b5a66SChristoph Hellwig 1627a874a63eSLiu Bo ret = mnt_want_write_file(file); 1628a874a63eSLiu Bo if (ret) 1629a874a63eSLiu Bo goto out; 1630a874a63eSLiu Bo 163172fd032eSSage Weil namelen = strlen(name); 163272fd032eSSage Weil if (strchr(name, '/')) { 1633f46b5a66SChristoph Hellwig ret = -EINVAL; 1634a874a63eSLiu Bo goto out_drop_write; 1635f46b5a66SChristoph Hellwig } 1636f46b5a66SChristoph Hellwig 163716780cabSChris Mason if (name[0] == '.' && 163816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 163916780cabSChris Mason ret = -EEXIST; 1640a874a63eSLiu Bo goto out_drop_write; 164116780cabSChris Mason } 164216780cabSChris Mason 16433de4586cSChris Mason if (subvol) { 164472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 16456f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1646cb8e7090SChristoph Hellwig } else { 16472903ff01SAl Viro struct fd src = fdget(fd); 16483de4586cSChris Mason struct inode *src_inode; 16492903ff01SAl Viro if (!src.file) { 16503de4586cSChris Mason ret = -EINVAL; 1651a874a63eSLiu Bo goto out_drop_write; 16523de4586cSChris Mason } 16533de4586cSChris Mason 1654496ad9aaSAl Viro src_inode = file_inode(src.file); 1655496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1656efe120a0SFrank Holton btrfs_info(BTRFS_I(src_inode)->root->fs_info, 1657efe120a0SFrank Holton "Snapshot src from another FS"); 165823ad5b17SKusanagi Kouichi ret = -EXDEV; 1659d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1660d0242061SDavid Sterba /* 1661d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1662d0242061SDavid Sterba * are limited to own subvolumes only 1663d0242061SDavid Sterba */ 1664d0242061SDavid Sterba ret = -EPERM; 1665ecd18815SAl Viro } else { 166672fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 166772fd032eSSage Weil BTRFS_I(src_inode)->root, 16686f72c7e2SArne Jansen transid, readonly, inherit); 1669ecd18815SAl Viro } 16702903ff01SAl Viro fdput(src); 1671cb8e7090SChristoph Hellwig } 1672a874a63eSLiu Bo out_drop_write: 1673a874a63eSLiu Bo mnt_drop_write_file(file); 1674f46b5a66SChristoph Hellwig out: 167572fd032eSSage Weil return ret; 167672fd032eSSage Weil } 167772fd032eSSage Weil 167872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1679fa0d2b9bSLi Zefan void __user *arg, int subvol) 168072fd032eSSage Weil { 1681fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 168272fd032eSSage Weil int ret; 168372fd032eSSage Weil 1684fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1685fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1686fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1687fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1688fa0d2b9bSLi Zefan 1689fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1690b83cc969SLi Zefan vol_args->fd, subvol, 16916f72c7e2SArne Jansen NULL, false, NULL); 1692fa0d2b9bSLi Zefan 1693fa0d2b9bSLi Zefan kfree(vol_args); 1694fa0d2b9bSLi Zefan return ret; 1695fa0d2b9bSLi Zefan } 1696fa0d2b9bSLi Zefan 1697fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1698fa0d2b9bSLi Zefan void __user *arg, int subvol) 1699fa0d2b9bSLi Zefan { 1700fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1701fa0d2b9bSLi Zefan int ret; 1702fdfb1e4fSLi Zefan u64 transid = 0; 1703fdfb1e4fSLi Zefan u64 *ptr = NULL; 1704b83cc969SLi Zefan bool readonly = false; 17056f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 170672fd032eSSage Weil 1707fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1708fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1709fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1710fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1711fdfb1e4fSLi Zefan 1712b83cc969SLi Zefan if (vol_args->flags & 17136f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 17146f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1715b83cc969SLi Zefan ret = -EOPNOTSUPP; 1716c47ca32dSDan Carpenter goto free_args; 1717fdfb1e4fSLi Zefan } 1718fdfb1e4fSLi Zefan 1719fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1720fdfb1e4fSLi Zefan ptr = &transid; 1721b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1722b83cc969SLi Zefan readonly = true; 17236f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 17246f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 17256f72c7e2SArne Jansen ret = -EINVAL; 1726c47ca32dSDan Carpenter goto free_args; 17276f72c7e2SArne Jansen } 17286f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 17296f72c7e2SArne Jansen if (IS_ERR(inherit)) { 17306f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1731c47ca32dSDan Carpenter goto free_args; 17326f72c7e2SArne Jansen } 17336f72c7e2SArne Jansen } 173475eaa0e2SSage Weil 1735fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 17366f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 17378696c533SMiao Xie readonly, inherit); 1738c47ca32dSDan Carpenter if (ret) 1739c47ca32dSDan Carpenter goto free_inherit; 174075eaa0e2SSage Weil 1741c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1742fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1743c47ca32dSDan Carpenter transid), 1744c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 174575eaa0e2SSage Weil ret = -EFAULT; 1746c47ca32dSDan Carpenter 1747c47ca32dSDan Carpenter free_inherit: 17486f72c7e2SArne Jansen kfree(inherit); 1749c47ca32dSDan Carpenter free_args: 1750c47ca32dSDan Carpenter kfree(vol_args); 1751f46b5a66SChristoph Hellwig return ret; 1752f46b5a66SChristoph Hellwig } 1753f46b5a66SChristoph Hellwig 17540caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 17550caa102dSLi Zefan void __user *arg) 17560caa102dSLi Zefan { 1757496ad9aaSAl Viro struct inode *inode = file_inode(file); 17580caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17590caa102dSLi Zefan int ret = 0; 17600caa102dSLi Zefan u64 flags = 0; 17610caa102dSLi Zefan 176233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 17630caa102dSLi Zefan return -EINVAL; 17640caa102dSLi Zefan 17650caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 17660caa102dSLi Zefan if (btrfs_root_readonly(root)) 17670caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 17680caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 17690caa102dSLi Zefan 17700caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 17710caa102dSLi Zefan ret = -EFAULT; 17720caa102dSLi Zefan 17730caa102dSLi Zefan return ret; 17740caa102dSLi Zefan } 17750caa102dSLi Zefan 17760caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 17770caa102dSLi Zefan void __user *arg) 17780caa102dSLi Zefan { 1779496ad9aaSAl Viro struct inode *inode = file_inode(file); 17800caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 17810caa102dSLi Zefan struct btrfs_trans_handle *trans; 17820caa102dSLi Zefan u64 root_flags; 17830caa102dSLi Zefan u64 flags; 17840caa102dSLi Zefan int ret = 0; 17850caa102dSLi Zefan 1786bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1787bd60ea0fSDavid Sterba return -EPERM; 1788bd60ea0fSDavid Sterba 1789b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1790b9ca0664SLiu Bo if (ret) 1791b9ca0664SLiu Bo goto out; 17920caa102dSLi Zefan 1793b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1794b9ca0664SLiu Bo ret = -EINVAL; 1795b9ca0664SLiu Bo goto out_drop_write; 1796b9ca0664SLiu Bo } 17970caa102dSLi Zefan 1798b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1799b9ca0664SLiu Bo ret = -EFAULT; 1800b9ca0664SLiu Bo goto out_drop_write; 1801b9ca0664SLiu Bo } 18020caa102dSLi Zefan 1803b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1804b9ca0664SLiu Bo ret = -EINVAL; 1805b9ca0664SLiu Bo goto out_drop_write; 1806b9ca0664SLiu Bo } 18070caa102dSLi Zefan 1808b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1809b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1810b9ca0664SLiu Bo goto out_drop_write; 1811b9ca0664SLiu Bo } 18120caa102dSLi Zefan 18130caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 18140caa102dSLi Zefan 18150caa102dSLi Zefan /* nothing to do */ 18160caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1817b9ca0664SLiu Bo goto out_drop_sem; 18180caa102dSLi Zefan 18190caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 18202c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 18210caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18220caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 18232c686537SDavid Sterba } else { 18242c686537SDavid Sterba /* 18252c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 18262c686537SDavid Sterba * send 18272c686537SDavid Sterba */ 18282c686537SDavid Sterba spin_lock(&root->root_item_lock); 18292c686537SDavid Sterba if (root->send_in_progress == 0) { 18300caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 18310caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 18322c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18332c686537SDavid Sterba } else { 18342c686537SDavid Sterba spin_unlock(&root->root_item_lock); 18352c686537SDavid Sterba btrfs_warn(root->fs_info, 18362c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 18372c686537SDavid Sterba root->root_key.objectid); 18382c686537SDavid Sterba ret = -EPERM; 18392c686537SDavid Sterba goto out_drop_sem; 18402c686537SDavid Sterba } 18412c686537SDavid Sterba } 18420caa102dSLi Zefan 18430caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 18440caa102dSLi Zefan if (IS_ERR(trans)) { 18450caa102dSLi Zefan ret = PTR_ERR(trans); 18460caa102dSLi Zefan goto out_reset; 18470caa102dSLi Zefan } 18480caa102dSLi Zefan 1849b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 18500caa102dSLi Zefan &root->root_key, &root->root_item); 18510caa102dSLi Zefan 18520caa102dSLi Zefan btrfs_commit_transaction(trans, root); 18530caa102dSLi Zefan out_reset: 18540caa102dSLi Zefan if (ret) 18550caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1856b9ca0664SLiu Bo out_drop_sem: 18570caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1858b9ca0664SLiu Bo out_drop_write: 1859b9ca0664SLiu Bo mnt_drop_write_file(file); 1860b9ca0664SLiu Bo out: 18610caa102dSLi Zefan return ret; 18620caa102dSLi Zefan } 18630caa102dSLi Zefan 186476dda93cSYan, Zheng /* 186576dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 186676dda93cSYan, Zheng */ 186776dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 186876dda93cSYan, Zheng { 186976dda93cSYan, Zheng struct btrfs_path *path; 1870175a2b87SJosef Bacik struct btrfs_dir_item *di; 187176dda93cSYan, Zheng struct btrfs_key key; 1872175a2b87SJosef Bacik u64 dir_id; 187376dda93cSYan, Zheng int ret; 187476dda93cSYan, Zheng 187576dda93cSYan, Zheng path = btrfs_alloc_path(); 187676dda93cSYan, Zheng if (!path) 187776dda93cSYan, Zheng return -ENOMEM; 187876dda93cSYan, Zheng 1879175a2b87SJosef Bacik /* Make sure this root isn't set as the default subvol */ 1880175a2b87SJosef Bacik dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 1881175a2b87SJosef Bacik di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, 1882175a2b87SJosef Bacik dir_id, "default", 7, 0); 1883175a2b87SJosef Bacik if (di && !IS_ERR(di)) { 1884175a2b87SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); 1885175a2b87SJosef Bacik if (key.objectid == root->root_key.objectid) { 188672de6b53SGuangyu Sun ret = -EPERM; 188772de6b53SGuangyu Sun btrfs_err(root->fs_info, "deleting default subvolume " 188872de6b53SGuangyu Sun "%llu is not allowed", key.objectid); 1889175a2b87SJosef Bacik goto out; 1890175a2b87SJosef Bacik } 1891175a2b87SJosef Bacik btrfs_release_path(path); 1892175a2b87SJosef Bacik } 1893175a2b87SJosef Bacik 189476dda93cSYan, Zheng key.objectid = root->root_key.objectid; 189576dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 189676dda93cSYan, Zheng key.offset = (u64)-1; 189776dda93cSYan, Zheng 189876dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 189976dda93cSYan, Zheng &key, path, 0, 0); 190076dda93cSYan, Zheng if (ret < 0) 190176dda93cSYan, Zheng goto out; 190276dda93cSYan, Zheng BUG_ON(ret == 0); 190376dda93cSYan, Zheng 190476dda93cSYan, Zheng ret = 0; 190576dda93cSYan, Zheng if (path->slots[0] > 0) { 190676dda93cSYan, Zheng path->slots[0]--; 190776dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 190876dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 190976dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 191076dda93cSYan, Zheng ret = -ENOTEMPTY; 191176dda93cSYan, Zheng } 191276dda93cSYan, Zheng out: 191376dda93cSYan, Zheng btrfs_free_path(path); 191476dda93cSYan, Zheng return ret; 191576dda93cSYan, Zheng } 191676dda93cSYan, Zheng 1917ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1918ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1919ac8e9819SChris Mason { 1920abc6e134SChris Mason struct btrfs_key test; 1921abc6e134SChris Mason int ret; 1922abc6e134SChris Mason 1923abc6e134SChris Mason test.objectid = sk->min_objectid; 1924abc6e134SChris Mason test.type = sk->min_type; 1925abc6e134SChris Mason test.offset = sk->min_offset; 1926abc6e134SChris Mason 1927abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1928abc6e134SChris Mason if (ret < 0) 1929ac8e9819SChris Mason return 0; 1930abc6e134SChris Mason 1931abc6e134SChris Mason test.objectid = sk->max_objectid; 1932abc6e134SChris Mason test.type = sk->max_type; 1933abc6e134SChris Mason test.offset = sk->max_offset; 1934abc6e134SChris Mason 1935abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1936abc6e134SChris Mason if (ret > 0) 1937ac8e9819SChris Mason return 0; 1938ac8e9819SChris Mason return 1; 1939ac8e9819SChris Mason } 1940ac8e9819SChris Mason 1941ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1942ac8e9819SChris Mason struct btrfs_path *path, 1943ac8e9819SChris Mason struct btrfs_key *key, 1944ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19459b6e817dSGerhard Heift size_t *buf_size, 1946ba346b35SGerhard Heift char __user *ubuf, 1947ac8e9819SChris Mason unsigned long *sk_offset, 1948ac8e9819SChris Mason int *num_found) 1949ac8e9819SChris Mason { 1950ac8e9819SChris Mason u64 found_transid; 1951ac8e9819SChris Mason struct extent_buffer *leaf; 1952ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1953dd81d459SNaohiro Aota struct btrfs_key test; 1954ac8e9819SChris Mason unsigned long item_off; 1955ac8e9819SChris Mason unsigned long item_len; 1956ac8e9819SChris Mason int nritems; 1957ac8e9819SChris Mason int i; 1958ac8e9819SChris Mason int slot; 1959ac8e9819SChris Mason int ret = 0; 1960ac8e9819SChris Mason 1961ac8e9819SChris Mason leaf = path->nodes[0]; 1962ac8e9819SChris Mason slot = path->slots[0]; 1963ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1964ac8e9819SChris Mason 1965ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1966ac8e9819SChris Mason i = nritems; 1967ac8e9819SChris Mason goto advance_key; 1968ac8e9819SChris Mason } 1969ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1970ac8e9819SChris Mason 1971ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1972ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1973ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1974ac8e9819SChris Mason 197503b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 197603b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 197703b71c6cSGabriel de Perthuis continue; 197803b71c6cSGabriel de Perthuis 19799b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 19808f5f6178SGerhard Heift if (*num_found) { 1981ac8e9819SChris Mason ret = 1; 19828f5f6178SGerhard Heift goto out; 19838f5f6178SGerhard Heift } 19848f5f6178SGerhard Heift 19858f5f6178SGerhard Heift /* 19868f5f6178SGerhard Heift * return one empty item back for v1, which does not 19878f5f6178SGerhard Heift * handle -EOVERFLOW 19888f5f6178SGerhard Heift */ 19898f5f6178SGerhard Heift 19909b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1991ac8e9819SChris Mason item_len = 0; 19928f5f6178SGerhard Heift ret = -EOVERFLOW; 19938f5f6178SGerhard Heift } 1994ac8e9819SChris Mason 19959b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1996ac8e9819SChris Mason ret = 1; 199725c9bc2eSGerhard Heift goto out; 1998ac8e9819SChris Mason } 1999ac8e9819SChris Mason 2000ac8e9819SChris Mason sh.objectid = key->objectid; 2001ac8e9819SChris Mason sh.offset = key->offset; 2002ac8e9819SChris Mason sh.type = key->type; 2003ac8e9819SChris Mason sh.len = item_len; 2004ac8e9819SChris Mason sh.transid = found_transid; 2005ac8e9819SChris Mason 2006ac8e9819SChris Mason /* copy search result header */ 2007ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2008ba346b35SGerhard Heift ret = -EFAULT; 2009ba346b35SGerhard Heift goto out; 2010ba346b35SGerhard Heift } 2011ba346b35SGerhard Heift 2012ac8e9819SChris Mason *sk_offset += sizeof(sh); 2013ac8e9819SChris Mason 2014ac8e9819SChris Mason if (item_len) { 2015ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2016ac8e9819SChris Mason /* copy the item */ 2017ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2018ba346b35SGerhard Heift item_off, item_len)) { 2019ba346b35SGerhard Heift ret = -EFAULT; 2020ba346b35SGerhard Heift goto out; 2021ba346b35SGerhard Heift } 2022ba346b35SGerhard Heift 2023ac8e9819SChris Mason *sk_offset += item_len; 2024ac8e9819SChris Mason } 2025e2156867SHugo Mills (*num_found)++; 2026ac8e9819SChris Mason 20278f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20288f5f6178SGerhard Heift goto out; 20298f5f6178SGerhard Heift 203025c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 203125c9bc2eSGerhard Heift ret = 1; 203225c9bc2eSGerhard Heift goto out; 203325c9bc2eSGerhard Heift } 2034ac8e9819SChris Mason } 2035ac8e9819SChris Mason advance_key: 2036ac8e9819SChris Mason ret = 0; 2037dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2038dd81d459SNaohiro Aota test.type = sk->max_type; 2039dd81d459SNaohiro Aota test.offset = sk->max_offset; 2040dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2041dd81d459SNaohiro Aota ret = 1; 2042dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2043abc6e134SChris Mason key->offset++; 2044dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2045abc6e134SChris Mason key->offset = 0; 2046abc6e134SChris Mason key->type++; 2047dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2048abc6e134SChris Mason key->offset = 0; 2049abc6e134SChris Mason key->type = 0; 2050abc6e134SChris Mason key->objectid++; 2051abc6e134SChris Mason } else 2052abc6e134SChris Mason ret = 1; 205325c9bc2eSGerhard Heift out: 2054ba346b35SGerhard Heift /* 2055ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2056ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2057ba346b35SGerhard Heift * * all items were found 2058ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2059ba346b35SGerhard Heift * leaf 2060ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2061ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2062ba346b35SGerhard Heift */ 2063ac8e9819SChris Mason return ret; 2064ac8e9819SChris Mason } 2065ac8e9819SChris Mason 2066ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 206712544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 20689b6e817dSGerhard Heift size_t *buf_size, 2069ba346b35SGerhard Heift char __user *ubuf) 2070ac8e9819SChris Mason { 2071ac8e9819SChris Mason struct btrfs_root *root; 2072ac8e9819SChris Mason struct btrfs_key key; 2073ac8e9819SChris Mason struct btrfs_path *path; 2074ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 2075ac8e9819SChris Mason int ret; 2076ac8e9819SChris Mason int num_found = 0; 2077ac8e9819SChris Mason unsigned long sk_offset = 0; 2078ac8e9819SChris Mason 20799b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 20809b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 208112544442SGerhard Heift return -EOVERFLOW; 20829b6e817dSGerhard Heift } 208312544442SGerhard Heift 2084ac8e9819SChris Mason path = btrfs_alloc_path(); 2085ac8e9819SChris Mason if (!path) 2086ac8e9819SChris Mason return -ENOMEM; 2087ac8e9819SChris Mason 2088ac8e9819SChris Mason if (sk->tree_id == 0) { 2089ac8e9819SChris Mason /* search the root of the inode that was passed */ 2090ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2091ac8e9819SChris Mason } else { 2092ac8e9819SChris Mason key.objectid = sk->tree_id; 2093ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2094ac8e9819SChris Mason key.offset = (u64)-1; 2095ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2096ac8e9819SChris Mason if (IS_ERR(root)) { 2097ac8e9819SChris Mason btrfs_free_path(path); 2098ac8e9819SChris Mason return -ENOENT; 2099ac8e9819SChris Mason } 2100ac8e9819SChris Mason } 2101ac8e9819SChris Mason 2102ac8e9819SChris Mason key.objectid = sk->min_objectid; 2103ac8e9819SChris Mason key.type = sk->min_type; 2104ac8e9819SChris Mason key.offset = sk->min_offset; 2105ac8e9819SChris Mason 2106ac8e9819SChris Mason while (1) { 21076174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2108ac8e9819SChris Mason if (ret != 0) { 2109ac8e9819SChris Mason if (ret > 0) 2110ac8e9819SChris Mason ret = 0; 2111ac8e9819SChris Mason goto err; 2112ac8e9819SChris Mason } 2113ba346b35SGerhard Heift ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, 2114ac8e9819SChris Mason &sk_offset, &num_found); 2115b3b4aa74SDavid Sterba btrfs_release_path(path); 211625c9bc2eSGerhard Heift if (ret) 2117ac8e9819SChris Mason break; 2118ac8e9819SChris Mason 2119ac8e9819SChris Mason } 21208f5f6178SGerhard Heift if (ret > 0) 2121ac8e9819SChris Mason ret = 0; 2122ac8e9819SChris Mason err: 2123ac8e9819SChris Mason sk->nr_items = num_found; 2124ac8e9819SChris Mason btrfs_free_path(path); 2125ac8e9819SChris Mason return ret; 2126ac8e9819SChris Mason } 2127ac8e9819SChris Mason 2128ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2129ac8e9819SChris Mason void __user *argp) 2130ac8e9819SChris Mason { 2131ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2132ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2133ac8e9819SChris Mason struct inode *inode; 2134ac8e9819SChris Mason int ret; 21359b6e817dSGerhard Heift size_t buf_size; 2136ac8e9819SChris Mason 2137ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2138ac8e9819SChris Mason return -EPERM; 2139ac8e9819SChris Mason 2140ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2141ac8e9819SChris Mason 2142ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2143ba346b35SGerhard Heift return -EFAULT; 2144ba346b35SGerhard Heift 2145ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2146ac8e9819SChris Mason 2147496ad9aaSAl Viro inode = file_inode(file); 2148ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21498f5f6178SGerhard Heift 21508f5f6178SGerhard Heift /* 21518f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21528f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21538f5f6178SGerhard Heift */ 21548f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21558f5f6178SGerhard Heift ret = 0; 21568f5f6178SGerhard Heift 2157ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2158ac8e9819SChris Mason ret = -EFAULT; 2159ac8e9819SChris Mason return ret; 2160ac8e9819SChris Mason } 2161ac8e9819SChris Mason 2162cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2163cc68a8a5SGerhard Heift void __user *argp) 2164cc68a8a5SGerhard Heift { 2165cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2166cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2167cc68a8a5SGerhard Heift struct inode *inode; 2168cc68a8a5SGerhard Heift int ret; 2169cc68a8a5SGerhard Heift size_t buf_size; 2170ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2171cc68a8a5SGerhard Heift 2172cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2173cc68a8a5SGerhard Heift return -EPERM; 2174cc68a8a5SGerhard Heift 2175cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2176cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2177cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2178cc68a8a5SGerhard Heift return -EFAULT; 2179cc68a8a5SGerhard Heift 2180cc68a8a5SGerhard Heift buf_size = args.buf_size; 2181cc68a8a5SGerhard Heift 2182cc68a8a5SGerhard Heift if (buf_size < sizeof(struct btrfs_ioctl_search_header)) 2183cc68a8a5SGerhard Heift return -EOVERFLOW; 2184cc68a8a5SGerhard Heift 2185cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2186cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2187cc68a8a5SGerhard Heift buf_size = buf_limit; 2188cc68a8a5SGerhard Heift 2189cc68a8a5SGerhard Heift inode = file_inode(file); 2190cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2191cc68a8a5SGerhard Heift (char *)(&uarg->buf[0])); 2192cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2193cc68a8a5SGerhard Heift ret = -EFAULT; 2194cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2195cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2196cc68a8a5SGerhard Heift ret = -EFAULT; 2197cc68a8a5SGerhard Heift 219876dda93cSYan, Zheng return ret; 219976dda93cSYan, Zheng } 220076dda93cSYan, Zheng 220198d377a0STARUISI Hiroaki /* 2202ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2203ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 220498d377a0STARUISI Hiroaki */ 220598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 220698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 220798d377a0STARUISI Hiroaki { 220898d377a0STARUISI Hiroaki struct btrfs_root *root; 220998d377a0STARUISI Hiroaki struct btrfs_key key; 2210ac8e9819SChris Mason char *ptr; 221198d377a0STARUISI Hiroaki int ret = -1; 221298d377a0STARUISI Hiroaki int slot; 221398d377a0STARUISI Hiroaki int len; 221498d377a0STARUISI Hiroaki int total_len = 0; 221598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 221698d377a0STARUISI Hiroaki struct extent_buffer *l; 221798d377a0STARUISI Hiroaki struct btrfs_path *path; 221898d377a0STARUISI Hiroaki 221998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 222098d377a0STARUISI Hiroaki name[0]='\0'; 222198d377a0STARUISI Hiroaki return 0; 222298d377a0STARUISI Hiroaki } 222398d377a0STARUISI Hiroaki 222498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 222598d377a0STARUISI Hiroaki if (!path) 222698d377a0STARUISI Hiroaki return -ENOMEM; 222798d377a0STARUISI Hiroaki 2228ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 222998d377a0STARUISI Hiroaki 223098d377a0STARUISI Hiroaki key.objectid = tree_id; 223198d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 223298d377a0STARUISI Hiroaki key.offset = (u64)-1; 223398d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 223498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2235f14d104dSDavid Sterba btrfs_err(info, "could not find root %llu", tree_id); 22368ad6fcabSChris Mason ret = -ENOENT; 22378ad6fcabSChris Mason goto out; 223898d377a0STARUISI Hiroaki } 223998d377a0STARUISI Hiroaki 224098d377a0STARUISI Hiroaki key.objectid = dirid; 224198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22428ad6fcabSChris Mason key.offset = (u64)-1; 224398d377a0STARUISI Hiroaki 224498d377a0STARUISI Hiroaki while (1) { 224598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 224698d377a0STARUISI Hiroaki if (ret < 0) 224798d377a0STARUISI Hiroaki goto out; 224818674c6cSFilipe David Borba Manana else if (ret > 0) { 224918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 225018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 225118674c6cSFilipe David Borba Manana if (ret < 0) 225218674c6cSFilipe David Borba Manana goto out; 225318674c6cSFilipe David Borba Manana else if (ret > 0) { 2254ac8e9819SChris Mason ret = -ENOENT; 225598d377a0STARUISI Hiroaki goto out; 2256ac8e9819SChris Mason } 225718674c6cSFilipe David Borba Manana } 225818674c6cSFilipe David Borba Manana 225918674c6cSFilipe David Borba Manana l = path->nodes[0]; 226018674c6cSFilipe David Borba Manana slot = path->slots[0]; 226118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 226298d377a0STARUISI Hiroaki 226398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 226498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 226598d377a0STARUISI Hiroaki ptr -= len + 1; 226698d377a0STARUISI Hiroaki total_len += len + 1; 2267a696cf35SFilipe David Borba Manana if (ptr < name) { 2268a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 226998d377a0STARUISI Hiroaki goto out; 2270a696cf35SFilipe David Borba Manana } 227198d377a0STARUISI Hiroaki 227298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 227398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 227498d377a0STARUISI Hiroaki 227598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 227698d377a0STARUISI Hiroaki break; 227798d377a0STARUISI Hiroaki 2278b3b4aa74SDavid Sterba btrfs_release_path(path); 227998d377a0STARUISI Hiroaki key.objectid = key.offset; 22808ad6fcabSChris Mason key.offset = (u64)-1; 228198d377a0STARUISI Hiroaki dirid = key.objectid; 228298d377a0STARUISI Hiroaki } 228377906a50SLi Zefan memmove(name, ptr, total_len); 228498d377a0STARUISI Hiroaki name[total_len] = '\0'; 228598d377a0STARUISI Hiroaki ret = 0; 228698d377a0STARUISI Hiroaki out: 228798d377a0STARUISI Hiroaki btrfs_free_path(path); 2288ac8e9819SChris Mason return ret; 2289ac8e9819SChris Mason } 2290ac8e9819SChris Mason 2291ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2292ac8e9819SChris Mason void __user *argp) 2293ac8e9819SChris Mason { 2294ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2295ac8e9819SChris Mason struct inode *inode; 229601b810b8SDavid Sterba int ret = 0; 2297ac8e9819SChris Mason 22982354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 22992354d08fSJulia Lawall if (IS_ERR(args)) 23002354d08fSJulia Lawall return PTR_ERR(args); 2301c2b96929SDan Carpenter 2302496ad9aaSAl Viro inode = file_inode(file); 2303ac8e9819SChris Mason 230401b810b8SDavid Sterba /* 230501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 230601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 230701b810b8SDavid Sterba */ 23081b53ac4dSChris Mason if (args->treeid == 0) 23091b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 23101b53ac4dSChris Mason 231101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 231201b810b8SDavid Sterba args->name[0] = 0; 231301b810b8SDavid Sterba goto out; 231401b810b8SDavid Sterba } 231501b810b8SDavid Sterba 231601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 231701b810b8SDavid Sterba ret = -EPERM; 231801b810b8SDavid Sterba goto out; 231901b810b8SDavid Sterba } 232001b810b8SDavid Sterba 2321ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2322ac8e9819SChris Mason args->treeid, args->objectid, 2323ac8e9819SChris Mason args->name); 2324ac8e9819SChris Mason 232501b810b8SDavid Sterba out: 2326ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2327ac8e9819SChris Mason ret = -EFAULT; 2328ac8e9819SChris Mason 2329ac8e9819SChris Mason kfree(args); 233098d377a0STARUISI Hiroaki return ret; 233198d377a0STARUISI Hiroaki } 233298d377a0STARUISI Hiroaki 233376dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 233476dda93cSYan, Zheng void __user *arg) 233576dda93cSYan, Zheng { 233654563d41SAl Viro struct dentry *parent = file->f_path.dentry; 233776dda93cSYan, Zheng struct dentry *dentry; 23382b0143b5SDavid Howells struct inode *dir = d_inode(parent); 233976dda93cSYan, Zheng struct inode *inode; 234076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 234176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 234276dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 234376dda93cSYan, Zheng struct btrfs_trans_handle *trans; 2344c58aaad2SMiao Xie struct btrfs_block_rsv block_rsv; 2345521e0546SDavid Sterba u64 root_flags; 2346c58aaad2SMiao Xie u64 qgroup_reserved; 234776dda93cSYan, Zheng int namelen; 234876dda93cSYan, Zheng int ret; 234976dda93cSYan, Zheng int err = 0; 235076dda93cSYan, Zheng 235176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 235276dda93cSYan, Zheng if (IS_ERR(vol_args)) 235376dda93cSYan, Zheng return PTR_ERR(vol_args); 235476dda93cSYan, Zheng 235576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 235676dda93cSYan, Zheng namelen = strlen(vol_args->name); 235776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 235876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 235976dda93cSYan, Zheng err = -EINVAL; 236076dda93cSYan, Zheng goto out; 236176dda93cSYan, Zheng } 236276dda93cSYan, Zheng 2363a561be71SAl Viro err = mnt_want_write_file(file); 236476dda93cSYan, Zheng if (err) 236576dda93cSYan, Zheng goto out; 236676dda93cSYan, Zheng 2367521e0546SDavid Sterba 23685c50c9b8SDavid Sterba err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); 23695c50c9b8SDavid Sterba if (err == -EINTR) 2370e43f998eSDavid Sterba goto out_drop_write; 237176dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 237276dda93cSYan, Zheng if (IS_ERR(dentry)) { 237376dda93cSYan, Zheng err = PTR_ERR(dentry); 237476dda93cSYan, Zheng goto out_unlock_dir; 237576dda93cSYan, Zheng } 237676dda93cSYan, Zheng 23772b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 237876dda93cSYan, Zheng err = -ENOENT; 237976dda93cSYan, Zheng goto out_dput; 238076dda93cSYan, Zheng } 238176dda93cSYan, Zheng 23822b0143b5SDavid Howells inode = d_inode(dentry); 23834260f7c7SSage Weil dest = BTRFS_I(inode)->root; 23844260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 23854260f7c7SSage Weil /* 23864260f7c7SSage Weil * Regular user. Only allow this with a special mount 23874260f7c7SSage Weil * option, when the user has write+exec access to the 23884260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 23894260f7c7SSage Weil * allowed. 23904260f7c7SSage Weil * 23914260f7c7SSage Weil * Note that this is _not_ check that the subvol is 23924260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 23934260f7c7SSage Weil * otherwise be able to delete. 23944260f7c7SSage Weil * 23954260f7c7SSage Weil * Users who want to delete empty subvols should try 23964260f7c7SSage Weil * rmdir(2). 23974260f7c7SSage Weil */ 23984260f7c7SSage Weil err = -EPERM; 23994260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 24004260f7c7SSage Weil goto out_dput; 24014260f7c7SSage Weil 24024260f7c7SSage Weil /* 24034260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 24044260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 24054260f7c7SSage Weil * must be called on the dentry referencing the root 24064260f7c7SSage Weil * of the subvol, not a random directory contained 24074260f7c7SSage Weil * within it. 24084260f7c7SSage Weil */ 24094260f7c7SSage Weil err = -EINVAL; 24104260f7c7SSage Weil if (root == dest) 24114260f7c7SSage Weil goto out_dput; 24124260f7c7SSage Weil 24134260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 24144260f7c7SSage Weil if (err) 24154260f7c7SSage Weil goto out_dput; 24165c39da5bSMiao Xie } 24174260f7c7SSage Weil 24185c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 24194260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 24204260f7c7SSage Weil if (err) 24214260f7c7SSage Weil goto out_dput; 24224260f7c7SSage Weil 242333345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 242476dda93cSYan, Zheng err = -EINVAL; 242576dda93cSYan, Zheng goto out_dput; 242676dda93cSYan, Zheng } 242776dda93cSYan, Zheng 24285955102cSAl Viro inode_lock(inode); 2429521e0546SDavid Sterba 2430521e0546SDavid Sterba /* 2431521e0546SDavid Sterba * Don't allow to delete a subvolume with send in progress. This is 2432521e0546SDavid Sterba * inside the i_mutex so the error handling that has to drop the bit 2433521e0546SDavid Sterba * again is not run concurrently. 2434521e0546SDavid Sterba */ 2435521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2436c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2437c55bfa67SFilipe Manana if (dest->send_in_progress == 0) { 2438c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2439521e0546SDavid Sterba root_flags | BTRFS_ROOT_SUBVOL_DEAD); 2440521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2441521e0546SDavid Sterba } else { 2442521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2443521e0546SDavid Sterba btrfs_warn(root->fs_info, 2444521e0546SDavid Sterba "Attempt to delete subvolume %llu during send", 2445c55bfa67SFilipe Manana dest->root_key.objectid); 2446521e0546SDavid Sterba err = -EPERM; 2447909e26dcSOmar Sandoval goto out_unlock_inode; 2448521e0546SDavid Sterba } 2449521e0546SDavid Sterba 245076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 245176dda93cSYan, Zheng 245276dda93cSYan, Zheng err = may_destroy_subvol(dest); 245376dda93cSYan, Zheng if (err) 245476dda93cSYan, Zheng goto out_up_write; 245576dda93cSYan, Zheng 2456c58aaad2SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 2457c58aaad2SMiao Xie /* 2458c58aaad2SMiao Xie * One for dir inode, two for dir entries, two for root 2459c58aaad2SMiao Xie * ref/backref. 2460c58aaad2SMiao Xie */ 2461c58aaad2SMiao Xie err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 2462ee3441b4SJeff Mahoney 5, &qgroup_reserved, true); 2463c58aaad2SMiao Xie if (err) 2464c58aaad2SMiao Xie goto out_up_write; 2465c58aaad2SMiao Xie 2466a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2467a22285a6SYan, Zheng if (IS_ERR(trans)) { 2468a22285a6SYan, Zheng err = PTR_ERR(trans); 2469c58aaad2SMiao Xie goto out_release; 2470a22285a6SYan, Zheng } 2471c58aaad2SMiao Xie trans->block_rsv = &block_rsv; 2472c58aaad2SMiao Xie trans->bytes_reserved = block_rsv.size; 2473a22285a6SYan, Zheng 247476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 247576dda93cSYan, Zheng dest->root_key.objectid, 247676dda93cSYan, Zheng dentry->d_name.name, 247776dda93cSYan, Zheng dentry->d_name.len); 247879787eaaSJeff Mahoney if (ret) { 247979787eaaSJeff Mahoney err = ret; 248079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 248179787eaaSJeff Mahoney goto out_end_trans; 248279787eaaSJeff Mahoney } 248376dda93cSYan, Zheng 248476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 248576dda93cSYan, Zheng 248676dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 248776dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 248876dda93cSYan, Zheng dest->root_item.drop_level = 0; 248976dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 249076dda93cSYan, Zheng 249127cdeb70SMiao Xie if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { 249276dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 249376dda93cSYan, Zheng root->fs_info->tree_root, 249476dda93cSYan, Zheng dest->root_key.objectid); 249579787eaaSJeff Mahoney if (ret) { 249679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 249779787eaaSJeff Mahoney err = ret; 249879787eaaSJeff Mahoney goto out_end_trans; 2499d68fc57bSYan, Zheng } 250079787eaaSJeff Mahoney } 2501dd5f9615SStefan Behrens 2502dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2503dd5f9615SStefan Behrens dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, 2504dd5f9615SStefan Behrens dest->root_key.objectid); 2505dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2506dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2507dd5f9615SStefan Behrens err = ret; 2508dd5f9615SStefan Behrens goto out_end_trans; 2509dd5f9615SStefan Behrens } 2510dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { 2511dd5f9615SStefan Behrens ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 2512dd5f9615SStefan Behrens dest->root_item.received_uuid, 2513dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 2514dd5f9615SStefan Behrens dest->root_key.objectid); 2515dd5f9615SStefan Behrens if (ret && ret != -ENOENT) { 2516dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 2517dd5f9615SStefan Behrens err = ret; 2518dd5f9615SStefan Behrens goto out_end_trans; 2519dd5f9615SStefan Behrens } 2520dd5f9615SStefan Behrens } 2521dd5f9615SStefan Behrens 252279787eaaSJeff Mahoney out_end_trans: 2523c58aaad2SMiao Xie trans->block_rsv = NULL; 2524c58aaad2SMiao Xie trans->bytes_reserved = 0; 25251ec9a1aeSFilipe Manana if (!err) 25261ec9a1aeSFilipe Manana btrfs_record_snapshot_destroy(trans, dir); 2527531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 252879787eaaSJeff Mahoney if (ret && !err) 252979787eaaSJeff Mahoney err = ret; 253076dda93cSYan, Zheng inode->i_flags |= S_DEAD; 2531c58aaad2SMiao Xie out_release: 2532c58aaad2SMiao Xie btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); 253376dda93cSYan, Zheng out_up_write: 253476dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 2535521e0546SDavid Sterba if (err) { 2536521e0546SDavid Sterba spin_lock(&dest->root_item_lock); 2537c55bfa67SFilipe Manana root_flags = btrfs_root_flags(&dest->root_item); 2538c55bfa67SFilipe Manana btrfs_set_root_flags(&dest->root_item, 2539521e0546SDavid Sterba root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); 2540521e0546SDavid Sterba spin_unlock(&dest->root_item_lock); 2541521e0546SDavid Sterba } 2542909e26dcSOmar Sandoval out_unlock_inode: 25435955102cSAl Viro inode_unlock(inode); 254476dda93cSYan, Zheng if (!err) { 254564ad6c48SOmar Sandoval d_invalidate(dentry); 254676dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 254776dda93cSYan, Zheng d_delete(dentry); 254861155aa0SDavid Sterba ASSERT(dest->send_in_progress == 0); 2549fa6ac876SLiu Bo 2550fa6ac876SLiu Bo /* the last ref */ 255157cdc8dbSDavid Sterba if (dest->ino_cache_inode) { 255257cdc8dbSDavid Sterba iput(dest->ino_cache_inode); 255357cdc8dbSDavid Sterba dest->ino_cache_inode = NULL; 2554fa6ac876SLiu Bo } 255576dda93cSYan, Zheng } 255676dda93cSYan, Zheng out_dput: 255776dda93cSYan, Zheng dput(dentry); 255876dda93cSYan, Zheng out_unlock_dir: 25595955102cSAl Viro inode_unlock(dir); 2560e43f998eSDavid Sterba out_drop_write: 25612a79f17eSAl Viro mnt_drop_write_file(file); 256276dda93cSYan, Zheng out: 256376dda93cSYan, Zheng kfree(vol_args); 256476dda93cSYan, Zheng return err; 256576dda93cSYan, Zheng } 256676dda93cSYan, Zheng 25671e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2568f46b5a66SChristoph Hellwig { 2569496ad9aaSAl Viro struct inode *inode = file_inode(file); 2570f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 25711e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2572c146afadSYan Zheng int ret; 2573c146afadSYan Zheng 257425122d15SIlya Dryomov ret = mnt_want_write_file(file); 257525122d15SIlya Dryomov if (ret) 257625122d15SIlya Dryomov return ret; 2577b83cc969SLi Zefan 257825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 257925122d15SIlya Dryomov ret = -EROFS; 258025122d15SIlya Dryomov goto out; 25815ac00addSStefan Behrens } 2582f46b5a66SChristoph Hellwig 2583f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2584f46b5a66SChristoph Hellwig case S_IFDIR: 2585e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2586e441d54dSChris Mason ret = -EPERM; 2587e441d54dSChris Mason goto out; 2588e441d54dSChris Mason } 2589de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 25908929ecfaSYan, Zheng if (ret) 25918929ecfaSYan, Zheng goto out; 2592de78b51aSEric Sandeen ret = btrfs_defrag_root(root->fs_info->extent_root); 2593f46b5a66SChristoph Hellwig break; 2594f46b5a66SChristoph Hellwig case S_IFREG: 2595e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2596e441d54dSChris Mason ret = -EINVAL; 2597e441d54dSChris Mason goto out; 2598e441d54dSChris Mason } 25991e701a32SChris Mason 26001e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 26011e701a32SChris Mason if (!range) { 26021e701a32SChris Mason ret = -ENOMEM; 26031e701a32SChris Mason goto out; 26041e701a32SChris Mason } 26051e701a32SChris Mason 26061e701a32SChris Mason if (argp) { 26071e701a32SChris Mason if (copy_from_user(range, argp, 26081e701a32SChris Mason sizeof(*range))) { 26091e701a32SChris Mason ret = -EFAULT; 26101e701a32SChris Mason kfree(range); 2611683be16eSDan Carpenter goto out; 26121e701a32SChris Mason } 26131e701a32SChris Mason /* compression requires us to start the IO */ 26141e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 26151e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 26161e701a32SChris Mason range->extent_thresh = (u32)-1; 26171e701a32SChris Mason } 26181e701a32SChris Mason } else { 26191e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 26201e701a32SChris Mason range->len = (u64)-1; 26211e701a32SChris Mason } 2622496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 26234cb5300bSChris Mason range, 0, 0); 26244cb5300bSChris Mason if (ret > 0) 26254cb5300bSChris Mason ret = 0; 26261e701a32SChris Mason kfree(range); 2627f46b5a66SChristoph Hellwig break; 26288929ecfaSYan, Zheng default: 26298929ecfaSYan, Zheng ret = -EINVAL; 2630f46b5a66SChristoph Hellwig } 2631e441d54dSChris Mason out: 263225122d15SIlya Dryomov mnt_drop_write_file(file); 2633e441d54dSChris Mason return ret; 2634f46b5a66SChristoph Hellwig } 2635f46b5a66SChristoph Hellwig 2636b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2637f46b5a66SChristoph Hellwig { 2638f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2639f46b5a66SChristoph Hellwig int ret; 2640f46b5a66SChristoph Hellwig 2641e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2642e441d54dSChris Mason return -EPERM; 2643e441d54dSChris Mason 26445ac00addSStefan Behrens if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 26455ac00addSStefan Behrens 1)) { 2646e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2647c9e9f97bSIlya Dryomov } 2648c9e9f97bSIlya Dryomov 26495ac00addSStefan Behrens mutex_lock(&root->fs_info->volume_mutex); 2650dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2651c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2652c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2653c9e9f97bSIlya Dryomov goto out; 2654c9e9f97bSIlya Dryomov } 2655f46b5a66SChristoph Hellwig 26565516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2657f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2658f46b5a66SChristoph Hellwig 265943d20761SAnand Jain if (!ret) 266043d20761SAnand Jain btrfs_info(root->fs_info, "disk added %s",vol_args->name); 266143d20761SAnand Jain 2662f46b5a66SChristoph Hellwig kfree(vol_args); 2663c9e9f97bSIlya Dryomov out: 2664c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26655ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2666f46b5a66SChristoph Hellwig return ret; 2667f46b5a66SChristoph Hellwig } 2668f46b5a66SChristoph Hellwig 2669da24927bSMiao Xie static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2670f46b5a66SChristoph Hellwig { 2671496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 2672f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2673f46b5a66SChristoph Hellwig int ret; 2674f46b5a66SChristoph Hellwig 2675e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2676e441d54dSChris Mason return -EPERM; 2677e441d54dSChris Mason 2678da24927bSMiao Xie ret = mnt_want_write_file(file); 2679da24927bSMiao Xie if (ret) 2680da24927bSMiao Xie return ret; 2681c146afadSYan Zheng 2682dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2683c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2684c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2685c47ca32dSDan Carpenter goto err_drop; 2686c9e9f97bSIlya Dryomov } 2687f46b5a66SChristoph Hellwig 26885516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2689f46b5a66SChristoph Hellwig 2690183860f6SAnand Jain if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, 2691183860f6SAnand Jain 1)) { 2692183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2693183860f6SAnand Jain goto out; 2694183860f6SAnand Jain } 2695183860f6SAnand Jain 2696183860f6SAnand Jain mutex_lock(&root->fs_info->volume_mutex); 2697183860f6SAnand Jain ret = btrfs_rm_device(root, vol_args->name); 2698c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 26995ac00addSStefan Behrens atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); 2700183860f6SAnand Jain 2701ec95d491SAnand Jain if (!ret) 2702ec95d491SAnand Jain btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); 2703ec95d491SAnand Jain 2704183860f6SAnand Jain out: 2705183860f6SAnand Jain kfree(vol_args); 2706c47ca32dSDan Carpenter err_drop: 27074ac20c70SIlya Dryomov mnt_drop_write_file(file); 2708f46b5a66SChristoph Hellwig return ret; 2709f46b5a66SChristoph Hellwig } 2710f46b5a66SChristoph Hellwig 2711475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2712475f6387SJan Schmidt { 2713027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2714475f6387SJan Schmidt struct btrfs_device *device; 2715475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2716027ed2f0SLi Zefan int ret = 0; 2717475f6387SJan Schmidt 2718027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2719027ed2f0SLi Zefan if (!fi_args) 2720027ed2f0SLi Zefan return -ENOMEM; 2721027ed2f0SLi Zefan 2722f7171750SFilipe David Borba Manana mutex_lock(&fs_devices->device_list_mutex); 2723027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2724027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2725475f6387SJan Schmidt 2726d7641a49SByongho Lee list_for_each_entry(device, &fs_devices->devices, dev_list) { 2727027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2728027ed2f0SLi Zefan fi_args->max_id = device->devid; 2729475f6387SJan Schmidt } 2730475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2731475f6387SJan Schmidt 273280a773fbSDavid Sterba fi_args->nodesize = root->fs_info->super_copy->nodesize; 273380a773fbSDavid Sterba fi_args->sectorsize = root->fs_info->super_copy->sectorsize; 273480a773fbSDavid Sterba fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; 273580a773fbSDavid Sterba 2736027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2737027ed2f0SLi Zefan ret = -EFAULT; 2738475f6387SJan Schmidt 2739027ed2f0SLi Zefan kfree(fi_args); 2740027ed2f0SLi Zefan return ret; 2741475f6387SJan Schmidt } 2742475f6387SJan Schmidt 2743475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2744475f6387SJan Schmidt { 2745475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2746475f6387SJan Schmidt struct btrfs_device *dev; 2747475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2748475f6387SJan Schmidt int ret = 0; 2749475f6387SJan Schmidt char *s_uuid = NULL; 2750475f6387SJan Schmidt 2751475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2752475f6387SJan Schmidt if (IS_ERR(di_args)) 2753475f6387SJan Schmidt return PTR_ERR(di_args); 2754475f6387SJan Schmidt 2755dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2756475f6387SJan Schmidt s_uuid = di_args->uuid; 2757475f6387SJan Schmidt 2758475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2759aa1b8cd4SStefan Behrens dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); 2760475f6387SJan Schmidt 2761475f6387SJan Schmidt if (!dev) { 2762475f6387SJan Schmidt ret = -ENODEV; 2763475f6387SJan Schmidt goto out; 2764475f6387SJan Schmidt } 2765475f6387SJan Schmidt 2766475f6387SJan Schmidt di_args->devid = dev->devid; 27677cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 27687cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2769475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2770a27202fbSJim Meyering if (dev->name) { 2771606686eeSJosef Bacik struct rcu_string *name; 2772606686eeSJosef Bacik 2773606686eeSJosef Bacik rcu_read_lock(); 2774606686eeSJosef Bacik name = rcu_dereference(dev->name); 2775606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2776606686eeSJosef Bacik rcu_read_unlock(); 2777a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2778a27202fbSJim Meyering } else { 277999ba55adSStefan Behrens di_args->path[0] = '\0'; 2780a27202fbSJim Meyering } 2781475f6387SJan Schmidt 2782475f6387SJan Schmidt out: 278355793c0dSDavid Sterba mutex_unlock(&fs_devices->device_list_mutex); 2784475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2785475f6387SJan Schmidt ret = -EFAULT; 2786475f6387SJan Schmidt 2787475f6387SJan Schmidt kfree(di_args); 2788475f6387SJan Schmidt return ret; 2789475f6387SJan Schmidt } 2790475f6387SJan Schmidt 2791f4414602SMark Fasheh static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) 2792416161dbSMark Fasheh { 2793416161dbSMark Fasheh struct page *page; 2794416161dbSMark Fasheh 2795416161dbSMark Fasheh page = grab_cache_page(inode->i_mapping, index); 2796416161dbSMark Fasheh if (!page) 279731314002SFilipe Manana return ERR_PTR(-ENOMEM); 2798416161dbSMark Fasheh 2799416161dbSMark Fasheh if (!PageUptodate(page)) { 280031314002SFilipe Manana int ret; 280131314002SFilipe Manana 280231314002SFilipe Manana ret = btrfs_readpage(NULL, page); 280331314002SFilipe Manana if (ret) 280431314002SFilipe Manana return ERR_PTR(ret); 2805416161dbSMark Fasheh lock_page(page); 2806416161dbSMark Fasheh if (!PageUptodate(page)) { 2807416161dbSMark Fasheh unlock_page(page); 2808416161dbSMark Fasheh page_cache_release(page); 280931314002SFilipe Manana return ERR_PTR(-EIO); 2810416161dbSMark Fasheh } 281131314002SFilipe Manana if (page->mapping != inode->i_mapping) { 2812416161dbSMark Fasheh unlock_page(page); 281331314002SFilipe Manana page_cache_release(page); 281431314002SFilipe Manana return ERR_PTR(-EAGAIN); 2815416161dbSMark Fasheh } 2816416161dbSMark Fasheh } 2817416161dbSMark Fasheh 2818416161dbSMark Fasheh return page; 2819416161dbSMark Fasheh } 2820416161dbSMark Fasheh 2821f4414602SMark Fasheh static int gather_extent_pages(struct inode *inode, struct page **pages, 2822f4414602SMark Fasheh int num_pages, u64 off) 2823f4414602SMark Fasheh { 2824f4414602SMark Fasheh int i; 2825f4414602SMark Fasheh pgoff_t index = off >> PAGE_CACHE_SHIFT; 2826f4414602SMark Fasheh 2827f4414602SMark Fasheh for (i = 0; i < num_pages; i++) { 282831314002SFilipe Manana again: 2829f4414602SMark Fasheh pages[i] = extent_same_get_page(inode, index + i); 283031314002SFilipe Manana if (IS_ERR(pages[i])) { 283131314002SFilipe Manana int err = PTR_ERR(pages[i]); 283231314002SFilipe Manana 283331314002SFilipe Manana if (err == -EAGAIN) 283431314002SFilipe Manana goto again; 283531314002SFilipe Manana pages[i] = NULL; 283631314002SFilipe Manana return err; 283731314002SFilipe Manana } 2838f4414602SMark Fasheh } 2839f4414602SMark Fasheh return 0; 2840f4414602SMark Fasheh } 2841f4414602SMark Fasheh 2842e0bd70c6SFilipe Manana static int lock_extent_range(struct inode *inode, u64 off, u64 len, 2843e0bd70c6SFilipe Manana bool retry_range_locking) 284477fe20dcSMark Fasheh { 2845e0bd70c6SFilipe Manana /* 2846e0bd70c6SFilipe Manana * Do any pending delalloc/csum calculations on inode, one way or 2847e0bd70c6SFilipe Manana * another, and lock file content. 2848e0bd70c6SFilipe Manana * The locking order is: 2849e0bd70c6SFilipe Manana * 2850e0bd70c6SFilipe Manana * 1) pages 2851e0bd70c6SFilipe Manana * 2) range in the inode's io tree 2852e0bd70c6SFilipe Manana */ 285377fe20dcSMark Fasheh while (1) { 285477fe20dcSMark Fasheh struct btrfs_ordered_extent *ordered; 285577fe20dcSMark Fasheh lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 285677fe20dcSMark Fasheh ordered = btrfs_lookup_first_ordered_extent(inode, 285777fe20dcSMark Fasheh off + len - 1); 2858ff5df9b8SFilipe Manana if ((!ordered || 2859ff5df9b8SFilipe Manana ordered->file_offset + ordered->len <= off || 2860ff5df9b8SFilipe Manana ordered->file_offset >= off + len) && 286177fe20dcSMark Fasheh !test_range_bit(&BTRFS_I(inode)->io_tree, off, 2862ff5df9b8SFilipe Manana off + len - 1, EXTENT_DELALLOC, 0, NULL)) { 2863ff5df9b8SFilipe Manana if (ordered) 2864ff5df9b8SFilipe Manana btrfs_put_ordered_extent(ordered); 286577fe20dcSMark Fasheh break; 2866ff5df9b8SFilipe Manana } 286777fe20dcSMark Fasheh unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); 286877fe20dcSMark Fasheh if (ordered) 286977fe20dcSMark Fasheh btrfs_put_ordered_extent(ordered); 2870e0bd70c6SFilipe Manana if (!retry_range_locking) 2871e0bd70c6SFilipe Manana return -EAGAIN; 287277fe20dcSMark Fasheh btrfs_wait_ordered_range(inode, off, len); 287377fe20dcSMark Fasheh } 2874e0bd70c6SFilipe Manana return 0; 287577fe20dcSMark Fasheh } 287677fe20dcSMark Fasheh 2877f4414602SMark Fasheh static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) 2878416161dbSMark Fasheh { 28795955102cSAl Viro inode_unlock(inode1); 28805955102cSAl Viro inode_unlock(inode2); 2881416161dbSMark Fasheh } 2882416161dbSMark Fasheh 2883f4414602SMark Fasheh static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) 2884f4414602SMark Fasheh { 2885f4414602SMark Fasheh if (inode1 < inode2) 2886f4414602SMark Fasheh swap(inode1, inode2); 2887f4414602SMark Fasheh 28885955102cSAl Viro inode_lock_nested(inode1, I_MUTEX_PARENT); 28895955102cSAl Viro inode_lock_nested(inode2, I_MUTEX_CHILD); 2890f4414602SMark Fasheh } 2891f4414602SMark Fasheh 2892f4414602SMark Fasheh static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, 2893f4414602SMark Fasheh struct inode *inode2, u64 loff2, u64 len) 2894f4414602SMark Fasheh { 2895f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 2896f4414602SMark Fasheh unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 2897f4414602SMark Fasheh } 2898f4414602SMark Fasheh 2899e0bd70c6SFilipe Manana static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1, 2900e0bd70c6SFilipe Manana struct inode *inode2, u64 loff2, u64 len, 2901e0bd70c6SFilipe Manana bool retry_range_locking) 2902416161dbSMark Fasheh { 2903e0bd70c6SFilipe Manana int ret; 2904e0bd70c6SFilipe Manana 2905416161dbSMark Fasheh if (inode1 < inode2) { 2906416161dbSMark Fasheh swap(inode1, inode2); 2907416161dbSMark Fasheh swap(loff1, loff2); 2908416161dbSMark Fasheh } 2909e0bd70c6SFilipe Manana ret = lock_extent_range(inode1, loff1, len, retry_range_locking); 2910e0bd70c6SFilipe Manana if (ret) 2911e0bd70c6SFilipe Manana return ret; 2912e0bd70c6SFilipe Manana ret = lock_extent_range(inode2, loff2, len, retry_range_locking); 2913e0bd70c6SFilipe Manana if (ret) 2914e0bd70c6SFilipe Manana unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, 2915e0bd70c6SFilipe Manana loff1 + len - 1); 2916e0bd70c6SFilipe Manana return ret; 2917416161dbSMark Fasheh } 2918f4414602SMark Fasheh 2919f4414602SMark Fasheh struct cmp_pages { 2920f4414602SMark Fasheh int num_pages; 2921f4414602SMark Fasheh struct page **src_pages; 2922f4414602SMark Fasheh struct page **dst_pages; 2923f4414602SMark Fasheh }; 2924f4414602SMark Fasheh 2925f4414602SMark Fasheh static void btrfs_cmp_data_free(struct cmp_pages *cmp) 2926f4414602SMark Fasheh { 2927f4414602SMark Fasheh int i; 2928f4414602SMark Fasheh struct page *pg; 2929f4414602SMark Fasheh 2930f4414602SMark Fasheh for (i = 0; i < cmp->num_pages; i++) { 2931f4414602SMark Fasheh pg = cmp->src_pages[i]; 2932e0bd70c6SFilipe Manana if (pg) { 2933e0bd70c6SFilipe Manana unlock_page(pg); 2934f4414602SMark Fasheh page_cache_release(pg); 2935e0bd70c6SFilipe Manana } 2936f4414602SMark Fasheh pg = cmp->dst_pages[i]; 2937e0bd70c6SFilipe Manana if (pg) { 2938e0bd70c6SFilipe Manana unlock_page(pg); 2939f4414602SMark Fasheh page_cache_release(pg); 2940f4414602SMark Fasheh } 2941e0bd70c6SFilipe Manana } 2942f4414602SMark Fasheh kfree(cmp->src_pages); 2943f4414602SMark Fasheh kfree(cmp->dst_pages); 2944f4414602SMark Fasheh } 2945f4414602SMark Fasheh 2946f4414602SMark Fasheh static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, 2947f4414602SMark Fasheh struct inode *dst, u64 dst_loff, 2948f4414602SMark Fasheh u64 len, struct cmp_pages *cmp) 2949f4414602SMark Fasheh { 2950f4414602SMark Fasheh int ret; 2951f4414602SMark Fasheh int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT; 2952f4414602SMark Fasheh struct page **src_pgarr, **dst_pgarr; 2953f4414602SMark Fasheh 2954f4414602SMark Fasheh /* 2955f4414602SMark Fasheh * We must gather up all the pages before we initiate our 2956f4414602SMark Fasheh * extent locking. We use an array for the page pointers. Size 2957f4414602SMark Fasheh * of the array is bounded by len, which is in turn bounded by 2958f4414602SMark Fasheh * BTRFS_MAX_DEDUPE_LEN. 2959f4414602SMark Fasheh */ 296066722f7cSDavid Sterba src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); 296166722f7cSDavid Sterba dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); 2962f4414602SMark Fasheh if (!src_pgarr || !dst_pgarr) { 2963f4414602SMark Fasheh kfree(src_pgarr); 2964f4414602SMark Fasheh kfree(dst_pgarr); 2965f4414602SMark Fasheh return -ENOMEM; 2966f4414602SMark Fasheh } 2967f4414602SMark Fasheh cmp->num_pages = num_pages; 2968f4414602SMark Fasheh cmp->src_pages = src_pgarr; 2969f4414602SMark Fasheh cmp->dst_pages = dst_pgarr; 2970f4414602SMark Fasheh 2971f4414602SMark Fasheh ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); 2972f4414602SMark Fasheh if (ret) 2973f4414602SMark Fasheh goto out; 2974f4414602SMark Fasheh 2975f4414602SMark Fasheh ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); 2976f4414602SMark Fasheh 2977f4414602SMark Fasheh out: 2978f4414602SMark Fasheh if (ret) 2979f4414602SMark Fasheh btrfs_cmp_data_free(cmp); 2980f4414602SMark Fasheh return 0; 2981416161dbSMark Fasheh } 2982416161dbSMark Fasheh 2983416161dbSMark Fasheh static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 2984f4414602SMark Fasheh u64 dst_loff, u64 len, struct cmp_pages *cmp) 2985416161dbSMark Fasheh { 2986416161dbSMark Fasheh int ret = 0; 2987f4414602SMark Fasheh int i; 2988416161dbSMark Fasheh struct page *src_page, *dst_page; 2989416161dbSMark Fasheh unsigned int cmp_len = PAGE_CACHE_SIZE; 2990416161dbSMark Fasheh void *addr, *dst_addr; 2991416161dbSMark Fasheh 2992f4414602SMark Fasheh i = 0; 2993416161dbSMark Fasheh while (len) { 2994416161dbSMark Fasheh if (len < PAGE_CACHE_SIZE) 2995416161dbSMark Fasheh cmp_len = len; 2996416161dbSMark Fasheh 2997f4414602SMark Fasheh BUG_ON(i >= cmp->num_pages); 2998f4414602SMark Fasheh 2999f4414602SMark Fasheh src_page = cmp->src_pages[i]; 3000f4414602SMark Fasheh dst_page = cmp->dst_pages[i]; 3001e0bd70c6SFilipe Manana ASSERT(PageLocked(src_page)); 3002e0bd70c6SFilipe Manana ASSERT(PageLocked(dst_page)); 3003f4414602SMark Fasheh 3004416161dbSMark Fasheh addr = kmap_atomic(src_page); 3005416161dbSMark Fasheh dst_addr = kmap_atomic(dst_page); 3006416161dbSMark Fasheh 3007416161dbSMark Fasheh flush_dcache_page(src_page); 3008416161dbSMark Fasheh flush_dcache_page(dst_page); 3009416161dbSMark Fasheh 3010416161dbSMark Fasheh if (memcmp(addr, dst_addr, cmp_len)) 30112b3909f8SDarrick J. Wong ret = -EBADE; 3012416161dbSMark Fasheh 3013416161dbSMark Fasheh kunmap_atomic(addr); 3014416161dbSMark Fasheh kunmap_atomic(dst_addr); 3015416161dbSMark Fasheh 3016416161dbSMark Fasheh if (ret) 3017416161dbSMark Fasheh break; 3018416161dbSMark Fasheh 3019416161dbSMark Fasheh len -= cmp_len; 3020f4414602SMark Fasheh i++; 3021416161dbSMark Fasheh } 3022416161dbSMark Fasheh 3023416161dbSMark Fasheh return ret; 3024416161dbSMark Fasheh } 3025416161dbSMark Fasheh 3026e1d227a4SMark Fasheh static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, 3027e1d227a4SMark Fasheh u64 olen) 3028416161dbSMark Fasheh { 3029e1d227a4SMark Fasheh u64 len = *plen; 3030416161dbSMark Fasheh u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; 3031416161dbSMark Fasheh 3032e1d227a4SMark Fasheh if (off + olen > inode->i_size || off + olen < off) 3033416161dbSMark Fasheh return -EINVAL; 3034e1d227a4SMark Fasheh 3035e1d227a4SMark Fasheh /* if we extend to eof, continue to block boundary */ 3036e1d227a4SMark Fasheh if (off + len == inode->i_size) 3037e1d227a4SMark Fasheh *plen = len = ALIGN(inode->i_size, bs) - off; 3038e1d227a4SMark Fasheh 3039416161dbSMark Fasheh /* Check that we are block aligned - btrfs_clone() requires this */ 3040416161dbSMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) 3041416161dbSMark Fasheh return -EINVAL; 3042416161dbSMark Fasheh 3043416161dbSMark Fasheh return 0; 3044416161dbSMark Fasheh } 3045416161dbSMark Fasheh 3046e1d227a4SMark Fasheh static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 3047416161dbSMark Fasheh struct inode *dst, u64 dst_loff) 3048416161dbSMark Fasheh { 3049416161dbSMark Fasheh int ret; 3050e1d227a4SMark Fasheh u64 len = olen; 3051f4414602SMark Fasheh struct cmp_pages cmp; 30520efa9f48SMark Fasheh int same_inode = 0; 30530efa9f48SMark Fasheh u64 same_lock_start = 0; 30540efa9f48SMark Fasheh u64 same_lock_len = 0; 3055416161dbSMark Fasheh 3056416161dbSMark Fasheh if (src == dst) 30570efa9f48SMark Fasheh same_inode = 1; 3058416161dbSMark Fasheh 3059113e8283SFilipe Manana if (len == 0) 3060113e8283SFilipe Manana return 0; 3061113e8283SFilipe Manana 30620efa9f48SMark Fasheh if (same_inode) { 30635955102cSAl Viro inode_lock(src); 30640efa9f48SMark Fasheh 30650efa9f48SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 30660efa9f48SMark Fasheh if (ret) 30670efa9f48SMark Fasheh goto out_unlock; 30680efa9f48SMark Fasheh 30690efa9f48SMark Fasheh /* 30700efa9f48SMark Fasheh * Single inode case wants the same checks, except we 30710efa9f48SMark Fasheh * don't want our length pushed out past i_size as 30720efa9f48SMark Fasheh * comparing that data range makes no sense. 30730efa9f48SMark Fasheh * 30740efa9f48SMark Fasheh * extent_same_check_offsets() will do this for an 30750efa9f48SMark Fasheh * unaligned length at i_size, so catch it here and 30760efa9f48SMark Fasheh * reject the request. 30770efa9f48SMark Fasheh * 30780efa9f48SMark Fasheh * This effectively means we require aligned extents 30790efa9f48SMark Fasheh * for the single-inode case, whereas the other cases 30800efa9f48SMark Fasheh * allow an unaligned length so long as it ends at 30810efa9f48SMark Fasheh * i_size. 30820efa9f48SMark Fasheh */ 30830efa9f48SMark Fasheh if (len != olen) { 30840efa9f48SMark Fasheh ret = -EINVAL; 30850efa9f48SMark Fasheh goto out_unlock; 30860efa9f48SMark Fasheh } 30870efa9f48SMark Fasheh 30880efa9f48SMark Fasheh /* Check for overlapping ranges */ 30890efa9f48SMark Fasheh if (dst_loff + len > loff && dst_loff < loff + len) { 30900efa9f48SMark Fasheh ret = -EINVAL; 30910efa9f48SMark Fasheh goto out_unlock; 30920efa9f48SMark Fasheh } 30930efa9f48SMark Fasheh 30940efa9f48SMark Fasheh same_lock_start = min_t(u64, loff, dst_loff); 30950efa9f48SMark Fasheh same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; 30960efa9f48SMark Fasheh } else { 3097f4414602SMark Fasheh btrfs_double_inode_lock(src, dst); 3098416161dbSMark Fasheh 3099e1d227a4SMark Fasheh ret = extent_same_check_offsets(src, loff, &len, olen); 3100416161dbSMark Fasheh if (ret) 3101416161dbSMark Fasheh goto out_unlock; 3102416161dbSMark Fasheh 3103e1d227a4SMark Fasheh ret = extent_same_check_offsets(dst, dst_loff, &len, olen); 3104416161dbSMark Fasheh if (ret) 3105416161dbSMark Fasheh goto out_unlock; 31060efa9f48SMark Fasheh } 3107416161dbSMark Fasheh 3108416161dbSMark Fasheh /* don't make the dst file partly checksummed */ 3109416161dbSMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 3110416161dbSMark Fasheh (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { 3111416161dbSMark Fasheh ret = -EINVAL; 3112416161dbSMark Fasheh goto out_unlock; 3113416161dbSMark Fasheh } 3114416161dbSMark Fasheh 3115e0bd70c6SFilipe Manana again: 3116f4414602SMark Fasheh ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); 3117f4414602SMark Fasheh if (ret) 3118f4414602SMark Fasheh goto out_unlock; 3119f4414602SMark Fasheh 31200efa9f48SMark Fasheh if (same_inode) 3121e0bd70c6SFilipe Manana ret = lock_extent_range(src, same_lock_start, same_lock_len, 3122e0bd70c6SFilipe Manana false); 31230efa9f48SMark Fasheh else 3124e0bd70c6SFilipe Manana ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len, 3125e0bd70c6SFilipe Manana false); 3126e0bd70c6SFilipe Manana /* 3127e0bd70c6SFilipe Manana * If one of the inodes has dirty pages in the respective range or 3128e0bd70c6SFilipe Manana * ordered extents, we need to flush dellaloc and wait for all ordered 3129e0bd70c6SFilipe Manana * extents in the range. We must unlock the pages and the ranges in the 3130e0bd70c6SFilipe Manana * io trees to avoid deadlocks when flushing delalloc (requires locking 3131e0bd70c6SFilipe Manana * pages) and when waiting for ordered extents to complete (they require 3132e0bd70c6SFilipe Manana * range locking). 3133e0bd70c6SFilipe Manana */ 3134e0bd70c6SFilipe Manana if (ret == -EAGAIN) { 3135e0bd70c6SFilipe Manana /* 3136e0bd70c6SFilipe Manana * Ranges in the io trees already unlocked. Now unlock all 3137e0bd70c6SFilipe Manana * pages before waiting for all IO to complete. 3138e0bd70c6SFilipe Manana */ 3139e0bd70c6SFilipe Manana btrfs_cmp_data_free(&cmp); 3140e0bd70c6SFilipe Manana if (same_inode) { 3141e0bd70c6SFilipe Manana btrfs_wait_ordered_range(src, same_lock_start, 3142e0bd70c6SFilipe Manana same_lock_len); 3143e0bd70c6SFilipe Manana } else { 3144e0bd70c6SFilipe Manana btrfs_wait_ordered_range(src, loff, len); 3145e0bd70c6SFilipe Manana btrfs_wait_ordered_range(dst, dst_loff, len); 3146e0bd70c6SFilipe Manana } 3147e0bd70c6SFilipe Manana goto again; 3148e0bd70c6SFilipe Manana } 3149e0bd70c6SFilipe Manana ASSERT(ret == 0); 3150e0bd70c6SFilipe Manana if (WARN_ON(ret)) { 3151e0bd70c6SFilipe Manana /* ranges in the io trees already unlocked */ 3152e0bd70c6SFilipe Manana btrfs_cmp_data_free(&cmp); 3153e0bd70c6SFilipe Manana return ret; 3154e0bd70c6SFilipe Manana } 3155f4414602SMark Fasheh 3156207910ddSMark Fasheh /* pass original length for comparison so we stay within i_size */ 3157f4414602SMark Fasheh ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); 3158416161dbSMark Fasheh if (ret == 0) 31591c919a5eSMark Fasheh ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); 3160416161dbSMark Fasheh 31610efa9f48SMark Fasheh if (same_inode) 31620efa9f48SMark Fasheh unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, 31630efa9f48SMark Fasheh same_lock_start + same_lock_len - 1); 31640efa9f48SMark Fasheh else 3165f4414602SMark Fasheh btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); 3166f4414602SMark Fasheh 3167f4414602SMark Fasheh btrfs_cmp_data_free(&cmp); 3168416161dbSMark Fasheh out_unlock: 31690efa9f48SMark Fasheh if (same_inode) 31705955102cSAl Viro inode_unlock(src); 31710efa9f48SMark Fasheh else 3172f4414602SMark Fasheh btrfs_double_inode_unlock(src, dst); 3173416161dbSMark Fasheh 3174416161dbSMark Fasheh return ret; 3175416161dbSMark Fasheh } 3176416161dbSMark Fasheh 3177ee22184bSByongho Lee #define BTRFS_MAX_DEDUPE_LEN SZ_16M 3178416161dbSMark Fasheh 31792b3909f8SDarrick J. Wong ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, 31802b3909f8SDarrick J. Wong struct file *dst_file, u64 dst_loff) 3181416161dbSMark Fasheh { 31822b3909f8SDarrick J. Wong struct inode *src = file_inode(src_file); 31832b3909f8SDarrick J. Wong struct inode *dst = file_inode(dst_file); 3184416161dbSMark Fasheh u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 31852b3909f8SDarrick J. Wong ssize_t res; 3186416161dbSMark Fasheh 31872b3909f8SDarrick J. Wong if (olen > BTRFS_MAX_DEDUPE_LEN) 31882b3909f8SDarrick J. Wong olen = BTRFS_MAX_DEDUPE_LEN; 3189416161dbSMark Fasheh 3190416161dbSMark Fasheh if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { 3191416161dbSMark Fasheh /* 3192416161dbSMark Fasheh * Btrfs does not support blocksize < page_size. As a 3193416161dbSMark Fasheh * result, btrfs_cmp_data() won't correctly handle 3194416161dbSMark Fasheh * this situation without an update. 3195416161dbSMark Fasheh */ 31962b3909f8SDarrick J. Wong return -EINVAL; 3197416161dbSMark Fasheh } 3198416161dbSMark Fasheh 31992b3909f8SDarrick J. Wong res = btrfs_extent_same(src, loff, olen, dst, dst_loff); 32002b3909f8SDarrick J. Wong if (res) 32012b3909f8SDarrick J. Wong return res; 32022b3909f8SDarrick J. Wong return olen; 3203416161dbSMark Fasheh } 3204416161dbSMark Fasheh 3205f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3206f82a9901SFilipe Manana struct inode *inode, 3207f82a9901SFilipe Manana u64 endoff, 3208f82a9901SFilipe Manana const u64 destoff, 32091c919a5eSMark Fasheh const u64 olen, 32101c919a5eSMark Fasheh int no_time_update) 3211f82a9901SFilipe Manana { 3212f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3213f82a9901SFilipe Manana int ret; 3214f82a9901SFilipe Manana 3215f82a9901SFilipe Manana inode_inc_iversion(inode); 32161c919a5eSMark Fasheh if (!no_time_update) 321704b285f3SDeepa Dinamani inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); 3218f82a9901SFilipe Manana /* 3219f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3220f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3221f82a9901SFilipe Manana */ 3222f82a9901SFilipe Manana if (endoff > destoff + olen) 3223f82a9901SFilipe Manana endoff = destoff + olen; 3224f82a9901SFilipe Manana if (endoff > inode->i_size) 3225f82a9901SFilipe Manana btrfs_i_size_write(inode, endoff); 3226f82a9901SFilipe Manana 3227f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3228f82a9901SFilipe Manana if (ret) { 3229f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3230f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3231f82a9901SFilipe Manana goto out; 3232f82a9901SFilipe Manana } 3233f82a9901SFilipe Manana ret = btrfs_end_transaction(trans, root); 3234f82a9901SFilipe Manana out: 3235f82a9901SFilipe Manana return ret; 3236f82a9901SFilipe Manana } 3237f82a9901SFilipe Manana 32387ffbb598SFilipe Manana static void clone_update_extent_map(struct inode *inode, 32397ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 32407ffbb598SFilipe Manana const struct btrfs_path *path, 32417ffbb598SFilipe Manana const u64 hole_offset, 32427ffbb598SFilipe Manana const u64 hole_len) 32437ffbb598SFilipe Manana { 32447ffbb598SFilipe Manana struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 32457ffbb598SFilipe Manana struct extent_map *em; 32467ffbb598SFilipe Manana int ret; 32477ffbb598SFilipe Manana 32487ffbb598SFilipe Manana em = alloc_extent_map(); 32497ffbb598SFilipe Manana if (!em) { 32507ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32517ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32527ffbb598SFilipe Manana return; 32537ffbb598SFilipe Manana } 32547ffbb598SFilipe Manana 325514f59796SFilipe Manana if (path) { 325614f59796SFilipe Manana struct btrfs_file_extent_item *fi; 325714f59796SFilipe Manana 325814f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 325914f59796SFilipe Manana struct btrfs_file_extent_item); 32607ffbb598SFilipe Manana btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 32617ffbb598SFilipe Manana em->generation = -1; 32627ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 32637ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 32647ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32657ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32667ffbb598SFilipe Manana } else { 32677ffbb598SFilipe Manana em->start = hole_offset; 32687ffbb598SFilipe Manana em->len = hole_len; 32697ffbb598SFilipe Manana em->ram_bytes = em->len; 32707ffbb598SFilipe Manana em->orig_start = hole_offset; 32717ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 32727ffbb598SFilipe Manana em->block_len = 0; 32737ffbb598SFilipe Manana em->orig_block_len = 0; 32747ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 32757ffbb598SFilipe Manana em->generation = trans->transid; 32767ffbb598SFilipe Manana } 32777ffbb598SFilipe Manana 32787ffbb598SFilipe Manana while (1) { 32797ffbb598SFilipe Manana write_lock(&em_tree->lock); 32807ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 32817ffbb598SFilipe Manana write_unlock(&em_tree->lock); 32827ffbb598SFilipe Manana if (ret != -EEXIST) { 32837ffbb598SFilipe Manana free_extent_map(em); 32847ffbb598SFilipe Manana break; 32857ffbb598SFilipe Manana } 32867ffbb598SFilipe Manana btrfs_drop_extent_cache(inode, em->start, 32877ffbb598SFilipe Manana em->start + em->len - 1, 0); 32887ffbb598SFilipe Manana } 32897ffbb598SFilipe Manana 3290ee39b432SDavid Sterba if (ret) 32917ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 32927ffbb598SFilipe Manana &BTRFS_I(inode)->runtime_flags); 32937ffbb598SFilipe Manana } 32947ffbb598SFilipe Manana 32958039d87dSFilipe Manana /* 32968039d87dSFilipe Manana * Make sure we do not end up inserting an inline extent into a file that has 32978039d87dSFilipe Manana * already other (non-inline) extents. If a file has an inline extent it can 32988039d87dSFilipe Manana * not have any other extents and the (single) inline extent must start at the 32998039d87dSFilipe Manana * file offset 0. Failing to respect these rules will lead to file corruption, 33008039d87dSFilipe Manana * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc 33018039d87dSFilipe Manana * 33028039d87dSFilipe Manana * We can have extents that have been already written to disk or we can have 33038039d87dSFilipe Manana * dirty ranges still in delalloc, in which case the extent maps and items are 33048039d87dSFilipe Manana * created only when we run delalloc, and the delalloc ranges might fall outside 33058039d87dSFilipe Manana * the range we are currently locking in the inode's io tree. So we check the 33068039d87dSFilipe Manana * inode's i_size because of that (i_size updates are done while holding the 33078039d87dSFilipe Manana * i_mutex, which we are holding here). 33088039d87dSFilipe Manana * We also check to see if the inode has a size not greater than "datal" but has 33098039d87dSFilipe Manana * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are 33108039d87dSFilipe Manana * protected against such concurrent fallocate calls by the i_mutex). 33118039d87dSFilipe Manana * 33128039d87dSFilipe Manana * If the file has no extents but a size greater than datal, do not allow the 33138039d87dSFilipe Manana * copy because we would need turn the inline extent into a non-inline one (even 33148039d87dSFilipe Manana * with NO_HOLES enabled). If we find our destination inode only has one inline 33158039d87dSFilipe Manana * extent, just overwrite it with the source inline extent if its size is less 33168039d87dSFilipe Manana * than the source extent's size, or we could copy the source inline extent's 33178039d87dSFilipe Manana * data into the destination inode's inline extent if the later is greater then 33188039d87dSFilipe Manana * the former. 33198039d87dSFilipe Manana */ 33208039d87dSFilipe Manana static int clone_copy_inline_extent(struct inode *src, 33218039d87dSFilipe Manana struct inode *dst, 33228039d87dSFilipe Manana struct btrfs_trans_handle *trans, 33238039d87dSFilipe Manana struct btrfs_path *path, 33248039d87dSFilipe Manana struct btrfs_key *new_key, 33258039d87dSFilipe Manana const u64 drop_start, 33268039d87dSFilipe Manana const u64 datal, 33278039d87dSFilipe Manana const u64 skip, 33288039d87dSFilipe Manana const u64 size, 33298039d87dSFilipe Manana char *inline_data) 33308039d87dSFilipe Manana { 33318039d87dSFilipe Manana struct btrfs_root *root = BTRFS_I(dst)->root; 33328039d87dSFilipe Manana const u64 aligned_end = ALIGN(new_key->offset + datal, 33338039d87dSFilipe Manana root->sectorsize); 33348039d87dSFilipe Manana int ret; 33358039d87dSFilipe Manana struct btrfs_key key; 33368039d87dSFilipe Manana 33378039d87dSFilipe Manana if (new_key->offset > 0) 33388039d87dSFilipe Manana return -EOPNOTSUPP; 33398039d87dSFilipe Manana 33408039d87dSFilipe Manana key.objectid = btrfs_ino(dst); 33418039d87dSFilipe Manana key.type = BTRFS_EXTENT_DATA_KEY; 33428039d87dSFilipe Manana key.offset = 0; 33438039d87dSFilipe Manana ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 33448039d87dSFilipe Manana if (ret < 0) { 33458039d87dSFilipe Manana return ret; 33468039d87dSFilipe Manana } else if (ret > 0) { 33478039d87dSFilipe Manana if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 33488039d87dSFilipe Manana ret = btrfs_next_leaf(root, path); 33498039d87dSFilipe Manana if (ret < 0) 33508039d87dSFilipe Manana return ret; 33518039d87dSFilipe Manana else if (ret > 0) 33528039d87dSFilipe Manana goto copy_inline_extent; 33538039d87dSFilipe Manana } 33548039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 33558039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 33568039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) { 33578039d87dSFilipe Manana ASSERT(key.offset > 0); 33588039d87dSFilipe Manana return -EOPNOTSUPP; 33598039d87dSFilipe Manana } 33608039d87dSFilipe Manana } else if (i_size_read(dst) <= datal) { 33618039d87dSFilipe Manana struct btrfs_file_extent_item *ei; 33628039d87dSFilipe Manana u64 ext_len; 33638039d87dSFilipe Manana 33648039d87dSFilipe Manana /* 33658039d87dSFilipe Manana * If the file size is <= datal, make sure there are no other 33668039d87dSFilipe Manana * extents following (can happen do to an fallocate call with 33678039d87dSFilipe Manana * the flag FALLOC_FL_KEEP_SIZE). 33688039d87dSFilipe Manana */ 33698039d87dSFilipe Manana ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 33708039d87dSFilipe Manana struct btrfs_file_extent_item); 33718039d87dSFilipe Manana /* 33728039d87dSFilipe Manana * If it's an inline extent, it can not have other extents 33738039d87dSFilipe Manana * following it. 33748039d87dSFilipe Manana */ 33758039d87dSFilipe Manana if (btrfs_file_extent_type(path->nodes[0], ei) == 33768039d87dSFilipe Manana BTRFS_FILE_EXTENT_INLINE) 33778039d87dSFilipe Manana goto copy_inline_extent; 33788039d87dSFilipe Manana 33798039d87dSFilipe Manana ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); 33808039d87dSFilipe Manana if (ext_len > aligned_end) 33818039d87dSFilipe Manana return -EOPNOTSUPP; 33828039d87dSFilipe Manana 33838039d87dSFilipe Manana ret = btrfs_next_item(root, path); 33848039d87dSFilipe Manana if (ret < 0) { 33858039d87dSFilipe Manana return ret; 33868039d87dSFilipe Manana } else if (ret == 0) { 33878039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 33888039d87dSFilipe Manana path->slots[0]); 33898039d87dSFilipe Manana if (key.objectid == btrfs_ino(dst) && 33908039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) 33918039d87dSFilipe Manana return -EOPNOTSUPP; 33928039d87dSFilipe Manana } 33938039d87dSFilipe Manana } 33948039d87dSFilipe Manana 33958039d87dSFilipe Manana copy_inline_extent: 33968039d87dSFilipe Manana /* 33978039d87dSFilipe Manana * We have no extent items, or we have an extent at offset 0 which may 33988039d87dSFilipe Manana * or may not be inlined. All these cases are dealt the same way. 33998039d87dSFilipe Manana */ 34008039d87dSFilipe Manana if (i_size_read(dst) > datal) { 34018039d87dSFilipe Manana /* 34028039d87dSFilipe Manana * If the destination inode has an inline extent... 34038039d87dSFilipe Manana * This would require copying the data from the source inline 34048039d87dSFilipe Manana * extent into the beginning of the destination's inline extent. 34058039d87dSFilipe Manana * But this is really complex, both extents can be compressed 34068039d87dSFilipe Manana * or just one of them, which would require decompressing and 34078039d87dSFilipe Manana * re-compressing data (which could increase the new compressed 34088039d87dSFilipe Manana * size, not allowing the compressed data to fit anymore in an 34098039d87dSFilipe Manana * inline extent). 34108039d87dSFilipe Manana * So just don't support this case for now (it should be rare, 34118039d87dSFilipe Manana * we are not really saving space when cloning inline extents). 34128039d87dSFilipe Manana */ 34138039d87dSFilipe Manana return -EOPNOTSUPP; 34148039d87dSFilipe Manana } 34158039d87dSFilipe Manana 34168039d87dSFilipe Manana btrfs_release_path(path); 34178039d87dSFilipe Manana ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); 34188039d87dSFilipe Manana if (ret) 34198039d87dSFilipe Manana return ret; 34208039d87dSFilipe Manana ret = btrfs_insert_empty_item(trans, root, path, new_key, size); 34218039d87dSFilipe Manana if (ret) 34228039d87dSFilipe Manana return ret; 34238039d87dSFilipe Manana 34248039d87dSFilipe Manana if (skip) { 34258039d87dSFilipe Manana const u32 start = btrfs_file_extent_calc_inline_size(0); 34268039d87dSFilipe Manana 34278039d87dSFilipe Manana memmove(inline_data + start, inline_data + start + skip, datal); 34288039d87dSFilipe Manana } 34298039d87dSFilipe Manana 34308039d87dSFilipe Manana write_extent_buffer(path->nodes[0], inline_data, 34318039d87dSFilipe Manana btrfs_item_ptr_offset(path->nodes[0], 34328039d87dSFilipe Manana path->slots[0]), 34338039d87dSFilipe Manana size); 34348039d87dSFilipe Manana inode_add_bytes(dst, datal); 34358039d87dSFilipe Manana 34368039d87dSFilipe Manana return 0; 34378039d87dSFilipe Manana } 34388039d87dSFilipe Manana 343932b7c687SMark Fasheh /** 344032b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 344132b7c687SMark Fasheh * 344232b7c687SMark Fasheh * @src: Inode to clone from 344332b7c687SMark Fasheh * @inode: Inode to clone to 344432b7c687SMark Fasheh * @off: Offset within source to start clone from 344532b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 34461c919a5eSMark Fasheh * @olen_aligned: Block-aligned value of olen 344732b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 34481c919a5eSMark Fasheh * @no_time_update: Whether to update mtime/ctime on the target inode 344932b7c687SMark Fasheh */ 345032b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3451f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 34521c919a5eSMark Fasheh const u64 destoff, int no_time_update) 3453f46b5a66SChristoph Hellwig { 3454f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 345532b7c687SMark Fasheh struct btrfs_path *path = NULL; 3456f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 345732b7c687SMark Fasheh struct btrfs_trans_handle *trans; 345832b7c687SMark Fasheh char *buf = NULL; 3459ae01a0abSYan Zheng struct btrfs_key key; 3460f46b5a66SChristoph Hellwig u32 nritems; 3461f46b5a66SChristoph Hellwig int slot; 3462ae01a0abSYan Zheng int ret; 3463f82a9901SFilipe Manana const u64 len = olen_aligned; 3464f82a9901SFilipe Manana u64 last_dest_end = destoff; 3465ae01a0abSYan Zheng 3466ae01a0abSYan Zheng ret = -ENOMEM; 3467707e8a07SDavid Sterba buf = vmalloc(root->nodesize); 3468ae01a0abSYan Zheng if (!buf) 346932b7c687SMark Fasheh return ret; 3470ae01a0abSYan Zheng 3471ae01a0abSYan Zheng path = btrfs_alloc_path(); 3472ae01a0abSYan Zheng if (!path) { 3473ae01a0abSYan Zheng vfree(buf); 347432b7c687SMark Fasheh return ret; 3475ae01a0abSYan Zheng } 347632b7c687SMark Fasheh 3477e4058b54SDavid Sterba path->reada = READA_FORWARD; 3478c5c9cd4dSSage Weil /* clone data */ 347933345d01SLi Zefan key.objectid = btrfs_ino(src); 3480ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 34812c463823SFilipe Manana key.offset = off; 3482f46b5a66SChristoph Hellwig 3483f46b5a66SChristoph Hellwig while (1) { 3484de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3485df858e76SFilipe Manana 3486f46b5a66SChristoph Hellwig /* 3487f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3488f46b5a66SChristoph Hellwig * tree. 3489f46b5a66SChristoph Hellwig */ 3490e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3491362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3492362a20c5SDavid Sterba 0, 0); 3493f46b5a66SChristoph Hellwig if (ret < 0) 3494f46b5a66SChristoph Hellwig goto out; 34952c463823SFilipe Manana /* 34962c463823SFilipe Manana * First search, if no extent item that starts at offset off was 34972c463823SFilipe Manana * found but the previous item is an extent item, it's possible 34982c463823SFilipe Manana * it might overlap our target range, therefore process it. 34992c463823SFilipe Manana */ 35002c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 35012c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 35022c463823SFilipe Manana path->slots[0] - 1); 35032c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 35042c463823SFilipe Manana path->slots[0]--; 35052c463823SFilipe Manana } 3506f46b5a66SChristoph Hellwig 3507ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3508e4355f34SFilipe David Borba Manana process_slot: 3509ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3510362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3511f46b5a66SChristoph Hellwig if (ret < 0) 3512f46b5a66SChristoph Hellwig goto out; 3513f46b5a66SChristoph Hellwig if (ret > 0) 3514f46b5a66SChristoph Hellwig break; 3515ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3516f46b5a66SChristoph Hellwig } 3517f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3518f46b5a66SChristoph Hellwig slot = path->slots[0]; 3519f46b5a66SChristoph Hellwig 3520ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3521962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 352233345d01SLi Zefan key.objectid != btrfs_ino(src)) 3523f46b5a66SChristoph Hellwig break; 3524f46b5a66SChristoph Hellwig 3525962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3526c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3527c5c9cd4dSSage Weil int type; 352831840ae1SZheng Yan u32 size; 352931840ae1SZheng Yan struct btrfs_key new_key; 3530c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3531c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3532c5c9cd4dSSage Weil u8 comp; 3533f82a9901SFilipe Manana u64 drop_start; 353431840ae1SZheng Yan 3535c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3536c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3537c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3538c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3539c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3540c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3541d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3542d397712bSChris Mason extent); 3543d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3544d397712bSChris Mason extent); 3545c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3546d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3547d397712bSChris Mason extent); 3548c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3549c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3550c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3551c5c9cd4dSSage Weil extent); 3552c5c9cd4dSSage Weil } 355331840ae1SZheng Yan 35542c463823SFilipe Manana /* 35552c463823SFilipe Manana * The first search might have left us at an extent 35562c463823SFilipe Manana * item that ends before our target range's start, can 35572c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 35582c463823SFilipe Manana */ 35592c463823SFilipe Manana if (key.offset + datal <= off) { 3560e4355f34SFilipe David Borba Manana path->slots[0]++; 3561e4355f34SFilipe David Borba Manana goto process_slot; 35622c463823SFilipe Manana } else if (key.offset >= off + len) { 35632c463823SFilipe Manana break; 3564e4355f34SFilipe David Borba Manana } 3565df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3566e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3567e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3568e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3569e4355f34SFilipe David Borba Manana size); 3570e4355f34SFilipe David Borba Manana 3571e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3572e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3573c5c9cd4dSSage Weil 357431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 357533345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 35764d728ec7SLi Zefan if (off <= key.offset) 3577c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 35784d728ec7SLi Zefan else 35794d728ec7SLi Zefan new_key.offset = destoff; 3580c5c9cd4dSSage Weil 3581b6f3409bSSage Weil /* 3582f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3583f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3584f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3585f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3586f82a9901SFilipe Manana * partially overlaps it). 3587f82a9901SFilipe Manana */ 3588f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3589f82a9901SFilipe Manana drop_start = last_dest_end; 3590f82a9901SFilipe Manana else 3591f82a9901SFilipe Manana drop_start = new_key.offset; 3592f82a9901SFilipe Manana 3593f82a9901SFilipe Manana /* 3594b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3595b6f3409bSSage Weil * 1 - add new extent 3596b6f3409bSSage Weil * 1 - inode update 3597b6f3409bSSage Weil */ 3598b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3599a22285a6SYan, Zheng if (IS_ERR(trans)) { 3600a22285a6SYan, Zheng ret = PTR_ERR(trans); 3601a22285a6SYan, Zheng goto out; 3602a22285a6SYan, Zheng } 3603a22285a6SYan, Zheng 3604c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3605c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3606d72c0842SLi Zefan /* 3607d72c0842SLi Zefan * a | --- range to clone ---| b 3608d72c0842SLi Zefan * | ------------- extent ------------- | 3609d72c0842SLi Zefan */ 3610d72c0842SLi Zefan 361193915584SAntonio Ospite /* subtract range b */ 3612d72c0842SLi Zefan if (key.offset + datal > off + len) 3613d72c0842SLi Zefan datal = off + len - key.offset; 3614d72c0842SLi Zefan 361593915584SAntonio Ospite /* subtract range a */ 3616a22285a6SYan, Zheng if (off > key.offset) { 3617a22285a6SYan, Zheng datao += off - key.offset; 3618a22285a6SYan, Zheng datal -= off - key.offset; 3619a22285a6SYan, Zheng } 3620a22285a6SYan, Zheng 36215dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3622f82a9901SFilipe Manana drop_start, 3623a22285a6SYan, Zheng new_key.offset + datal, 36242671485dSJosef Bacik 1); 362579787eaaSJeff Mahoney if (ret) { 36263f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 362700fdf13aSLiu Bo btrfs_abort_transaction(trans, 362800fdf13aSLiu Bo root, ret); 362979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 363079787eaaSJeff Mahoney goto out; 363179787eaaSJeff Mahoney } 3632a22285a6SYan, Zheng 363331840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 363431840ae1SZheng Yan &new_key, size); 363579787eaaSJeff Mahoney if (ret) { 363679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 363779787eaaSJeff Mahoney ret); 363879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 363979787eaaSJeff Mahoney goto out; 364079787eaaSJeff Mahoney } 364131840ae1SZheng Yan 364231840ae1SZheng Yan leaf = path->nodes[0]; 364331840ae1SZheng Yan slot = path->slots[0]; 364431840ae1SZheng Yan write_extent_buffer(leaf, buf, 364531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 364631840ae1SZheng Yan size); 3647ae01a0abSYan Zheng 3648f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3649f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3650c5c9cd4dSSage Weil 3651c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3652c5c9cd4dSSage Weil if (!disko) 3653c5c9cd4dSSage Weil datao = 0; 3654c5c9cd4dSSage Weil 3655c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3656c5c9cd4dSSage Weil datao); 3657c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3658c5c9cd4dSSage Weil datal); 3659fcebe456SJosef Bacik 3660c5c9cd4dSSage Weil if (disko) { 3661c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 3662ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 36635d4f98a2SYan Zheng disko, diskl, 0, 3664f46b5a66SChristoph Hellwig root->root_key.objectid, 366533345d01SLi Zefan btrfs_ino(inode), 3666b06c4bf5SFilipe Manana new_key.offset - datao); 366779787eaaSJeff Mahoney if (ret) { 366879787eaaSJeff Mahoney btrfs_abort_transaction(trans, 366979787eaaSJeff Mahoney root, 367079787eaaSJeff Mahoney ret); 367179787eaaSJeff Mahoney btrfs_end_transaction(trans, 367279787eaaSJeff Mahoney root); 367379787eaaSJeff Mahoney goto out; 367479787eaaSJeff Mahoney 367579787eaaSJeff Mahoney } 3676f46b5a66SChristoph Hellwig } 3677c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3678c5c9cd4dSSage Weil u64 skip = 0; 3679c5c9cd4dSSage Weil u64 trim = 0; 3680ed958762SFilipe Manana 3681c5c9cd4dSSage Weil if (off > key.offset) { 3682c5c9cd4dSSage Weil skip = off - key.offset; 3683c5c9cd4dSSage Weil new_key.offset += skip; 368431840ae1SZheng Yan } 3685d397712bSChris Mason 3686c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3687c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3688d397712bSChris Mason 3689c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3690c5c9cd4dSSage Weil ret = -EINVAL; 3691a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 3692c5c9cd4dSSage Weil goto out; 369331840ae1SZheng Yan } 3694c5c9cd4dSSage Weil size -= skip + trim; 3695c5c9cd4dSSage Weil datal -= skip + trim; 3696a22285a6SYan, Zheng 36978039d87dSFilipe Manana ret = clone_copy_inline_extent(src, inode, 36988039d87dSFilipe Manana trans, path, 36998039d87dSFilipe Manana &new_key, 3700f82a9901SFilipe Manana drop_start, 37018039d87dSFilipe Manana datal, 37028039d87dSFilipe Manana skip, size, buf); 370379787eaaSJeff Mahoney if (ret) { 37043f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 37053a29bc09SChris Mason btrfs_abort_transaction(trans, 37068039d87dSFilipe Manana root, 370779787eaaSJeff Mahoney ret); 370879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 370979787eaaSJeff Mahoney goto out; 371079787eaaSJeff Mahoney } 3711c5c9cd4dSSage Weil leaf = path->nodes[0]; 3712c5c9cd4dSSage Weil slot = path->slots[0]; 3713c5c9cd4dSSage Weil } 3714c5c9cd4dSSage Weil 37157ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 37167ffbb598SFilipe Manana if (drop_start < new_key.offset) 37177ffbb598SFilipe Manana clone_update_extent_map(inode, trans, 371814f59796SFilipe Manana NULL, drop_start, 37197ffbb598SFilipe Manana new_key.offset - drop_start); 37207ffbb598SFilipe Manana 372114f59796SFilipe Manana clone_update_extent_map(inode, trans, path, 0, 0); 37227ffbb598SFilipe Manana 3723c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3724b3b4aa74SDavid Sterba btrfs_release_path(path); 3725c5c9cd4dSSage Weil 372662e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 372762e2390eSFilipe Manana root->sectorsize); 3728f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3729f82a9901SFilipe Manana last_dest_end, 37301c919a5eSMark Fasheh destoff, olen, 37311c919a5eSMark Fasheh no_time_update); 3732f82a9901SFilipe Manana if (ret) 373379787eaaSJeff Mahoney goto out; 37342c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 37352c463823SFilipe Manana break; 3736a22285a6SYan, Zheng } 3737b3b4aa74SDavid Sterba btrfs_release_path(path); 3738df858e76SFilipe Manana key.offset = next_key_min_offset; 3739ae01a0abSYan Zheng } 3740f46b5a66SChristoph Hellwig ret = 0; 374132b7c687SMark Fasheh 3742f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3743f82a9901SFilipe Manana /* 3744f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3745f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3746f82a9901SFilipe Manana */ 3747b3b4aa74SDavid Sterba btrfs_release_path(path); 3748f82a9901SFilipe Manana 3749f82a9901SFilipe Manana /* 3750f82a9901SFilipe Manana * 1 - remove extent(s) 3751f82a9901SFilipe Manana * 1 - inode update 3752f82a9901SFilipe Manana */ 3753f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3754f82a9901SFilipe Manana if (IS_ERR(trans)) { 3755f82a9901SFilipe Manana ret = PTR_ERR(trans); 3756f82a9901SFilipe Manana goto out; 3757f82a9901SFilipe Manana } 3758f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3759f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3760f82a9901SFilipe Manana if (ret) { 3761f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 3762f82a9901SFilipe Manana btrfs_abort_transaction(trans, root, ret); 3763f82a9901SFilipe Manana btrfs_end_transaction(trans, root); 3764f82a9901SFilipe Manana goto out; 3765f82a9901SFilipe Manana } 376614f59796SFilipe Manana clone_update_extent_map(inode, trans, NULL, last_dest_end, 376714f59796SFilipe Manana destoff + len - last_dest_end); 3768f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 37691c919a5eSMark Fasheh destoff, olen, no_time_update); 3770f82a9901SFilipe Manana } 3771f82a9901SFilipe Manana 3772f46b5a66SChristoph Hellwig out: 377332b7c687SMark Fasheh btrfs_free_path(path); 377432b7c687SMark Fasheh vfree(buf); 377532b7c687SMark Fasheh return ret; 377632b7c687SMark Fasheh } 377732b7c687SMark Fasheh 37783db11b2eSZach Brown static noinline int btrfs_clone_files(struct file *file, struct file *file_src, 377932b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 378032b7c687SMark Fasheh { 378154563d41SAl Viro struct inode *inode = file_inode(file); 37823db11b2eSZach Brown struct inode *src = file_inode(file_src); 378332b7c687SMark Fasheh struct btrfs_root *root = BTRFS_I(inode)->root; 378432b7c687SMark Fasheh int ret; 378532b7c687SMark Fasheh u64 len = olen; 378632b7c687SMark Fasheh u64 bs = root->fs_info->sb->s_blocksize; 37873db11b2eSZach Brown int same_inode = src == inode; 378832b7c687SMark Fasheh 378932b7c687SMark Fasheh /* 379032b7c687SMark Fasheh * TODO: 379132b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 379232b7c687SMark Fasheh * decompress into destination's address_space (the file offset 379332b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 379432b7c687SMark Fasheh * otherwise reinsert) a subrange. 379500fdf13aSLiu Bo * 379600fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 379700fdf13aSLiu Bo * be either compressed or non-compressed. 379832b7c687SMark Fasheh */ 379932b7c687SMark Fasheh 380032b7c687SMark Fasheh if (btrfs_root_readonly(root)) 380132b7c687SMark Fasheh return -EROFS; 380232b7c687SMark Fasheh 38033db11b2eSZach Brown if (file_src->f_path.mnt != file->f_path.mnt || 38043db11b2eSZach Brown src->i_sb != inode->i_sb) 38053db11b2eSZach Brown return -EXDEV; 380632b7c687SMark Fasheh 380732b7c687SMark Fasheh /* don't make the dst file partly checksummed */ 380832b7c687SMark Fasheh if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 380932b7c687SMark Fasheh (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 38103db11b2eSZach Brown return -EINVAL; 381132b7c687SMark Fasheh 381232b7c687SMark Fasheh if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 38133db11b2eSZach Brown return -EISDIR; 381432b7c687SMark Fasheh 381532b7c687SMark Fasheh if (!same_inode) { 3816293a8489SMark Fasheh btrfs_double_inode_lock(src, inode); 381732b7c687SMark Fasheh } else { 38185955102cSAl Viro inode_lock(src); 381932b7c687SMark Fasheh } 382032b7c687SMark Fasheh 382132b7c687SMark Fasheh /* determine range to clone */ 382232b7c687SMark Fasheh ret = -EINVAL; 382332b7c687SMark Fasheh if (off + len > src->i_size || off + len < off) 382432b7c687SMark Fasheh goto out_unlock; 382532b7c687SMark Fasheh if (len == 0) 382632b7c687SMark Fasheh olen = len = src->i_size - off; 382732b7c687SMark Fasheh /* if we extend to eof, continue to block boundary */ 382832b7c687SMark Fasheh if (off + len == src->i_size) 382932b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 383032b7c687SMark Fasheh 3831ccccf3d6SFilipe Manana if (len == 0) { 3832ccccf3d6SFilipe Manana ret = 0; 3833ccccf3d6SFilipe Manana goto out_unlock; 3834ccccf3d6SFilipe Manana } 3835ccccf3d6SFilipe Manana 383632b7c687SMark Fasheh /* verify the end result is block aligned */ 383732b7c687SMark Fasheh if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 383832b7c687SMark Fasheh !IS_ALIGNED(destoff, bs)) 383932b7c687SMark Fasheh goto out_unlock; 384032b7c687SMark Fasheh 384132b7c687SMark Fasheh /* verify if ranges are overlapped within the same file */ 384232b7c687SMark Fasheh if (same_inode) { 384332b7c687SMark Fasheh if (destoff + len > off && destoff < off + len) 384432b7c687SMark Fasheh goto out_unlock; 384532b7c687SMark Fasheh } 384632b7c687SMark Fasheh 384732b7c687SMark Fasheh if (destoff > inode->i_size) { 384832b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 384932b7c687SMark Fasheh if (ret) 385032b7c687SMark Fasheh goto out_unlock; 385132b7c687SMark Fasheh } 385232b7c687SMark Fasheh 3853c125b8bfSFilipe Manana /* 3854c125b8bfSFilipe Manana * Lock the target range too. Right after we replace the file extent 3855c125b8bfSFilipe Manana * items in the fs tree (which now point to the cloned data), we might 3856c125b8bfSFilipe Manana * have a worker replace them with extent items relative to a write 3857c125b8bfSFilipe Manana * operation that was issued before this clone operation (i.e. confront 3858c125b8bfSFilipe Manana * with inode.c:btrfs_finish_ordered_io). 3859c125b8bfSFilipe Manana */ 3860c125b8bfSFilipe Manana if (same_inode) { 3861c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3862c125b8bfSFilipe Manana u64 lock_len = max_t(u64, off, destoff) + len - lock_start; 386332b7c687SMark Fasheh 3864e0bd70c6SFilipe Manana ret = lock_extent_range(src, lock_start, lock_len, true); 3865c125b8bfSFilipe Manana } else { 3866e0bd70c6SFilipe Manana ret = btrfs_double_extent_lock(src, off, inode, destoff, len, 3867e0bd70c6SFilipe Manana true); 3868e0bd70c6SFilipe Manana } 3869e0bd70c6SFilipe Manana ASSERT(ret == 0); 3870e0bd70c6SFilipe Manana if (WARN_ON(ret)) { 3871e0bd70c6SFilipe Manana /* ranges in the io trees already unlocked */ 3872e0bd70c6SFilipe Manana goto out_unlock; 3873c125b8bfSFilipe Manana } 387432b7c687SMark Fasheh 38751c919a5eSMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); 387632b7c687SMark Fasheh 3877c125b8bfSFilipe Manana if (same_inode) { 3878c125b8bfSFilipe Manana u64 lock_start = min_t(u64, off, destoff); 3879c125b8bfSFilipe Manana u64 lock_end = max_t(u64, off, destoff) + len - 1; 3880c125b8bfSFilipe Manana 3881c125b8bfSFilipe Manana unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); 3882c125b8bfSFilipe Manana } else { 3883293a8489SMark Fasheh btrfs_double_extent_unlock(src, off, inode, destoff, len); 3884c125b8bfSFilipe Manana } 3885c125b8bfSFilipe Manana /* 3886c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3887c125b8bfSFilipe Manana * data immediately and not the previous data. 3888c125b8bfSFilipe Manana */ 388965bfa658SChandan Rajendra truncate_inode_pages_range(&inode->i_data, 389065bfa658SChandan Rajendra round_down(destoff, PAGE_CACHE_SIZE), 389165bfa658SChandan Rajendra round_up(destoff + len, PAGE_CACHE_SIZE) - 1); 3892f46b5a66SChristoph Hellwig out_unlock: 3893293a8489SMark Fasheh if (!same_inode) 3894293a8489SMark Fasheh btrfs_double_inode_unlock(src, inode); 3895293a8489SMark Fasheh else 38965955102cSAl Viro inode_unlock(src); 38973db11b2eSZach Brown return ret; 38983db11b2eSZach Brown } 38993db11b2eSZach Brown 39003db11b2eSZach Brown ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, 39013db11b2eSZach Brown struct file *file_out, loff_t pos_out, 39023db11b2eSZach Brown size_t len, unsigned int flags) 39033db11b2eSZach Brown { 39043db11b2eSZach Brown ssize_t ret; 39053db11b2eSZach Brown 39063db11b2eSZach Brown ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out); 39073db11b2eSZach Brown if (ret == 0) 39083db11b2eSZach Brown ret = len; 39093db11b2eSZach Brown return ret; 39103db11b2eSZach Brown } 39113db11b2eSZach Brown 391204b38d60SChristoph Hellwig int btrfs_clone_file_range(struct file *src_file, loff_t off, 391304b38d60SChristoph Hellwig struct file *dst_file, loff_t destoff, u64 len) 39143db11b2eSZach Brown { 391504b38d60SChristoph Hellwig return btrfs_clone_files(dst_file, src_file, off, len, destoff); 3916c5c9cd4dSSage Weil } 3917c5c9cd4dSSage Weil 3918f46b5a66SChristoph Hellwig /* 3919f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3920f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3921f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3922f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3923f46b5a66SChristoph Hellwig */ 3924b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 3925f46b5a66SChristoph Hellwig { 3926496ad9aaSAl Viro struct inode *inode = file_inode(file); 3927f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3928f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 39291ab86aedSSage Weil int ret; 3930f46b5a66SChristoph Hellwig 39311ab86aedSSage Weil ret = -EPERM; 3932df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3933f46b5a66SChristoph Hellwig goto out; 39341ab86aedSSage Weil 39351ab86aedSSage Weil ret = -EINPROGRESS; 39361ab86aedSSage Weil if (file->private_data) 39371ab86aedSSage Weil goto out; 39389ca9ee09SSage Weil 3939b83cc969SLi Zefan ret = -EROFS; 3940b83cc969SLi Zefan if (btrfs_root_readonly(root)) 3941b83cc969SLi Zefan goto out; 3942b83cc969SLi Zefan 3943a561be71SAl Viro ret = mnt_want_write_file(file); 3944c146afadSYan Zheng if (ret) 3945c146afadSYan Zheng goto out; 3946c146afadSYan Zheng 3947a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 39489ca9ee09SSage Weil 3949f46b5a66SChristoph Hellwig ret = -ENOMEM; 39507a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 3951abd30bb0STsutomu Itoh if (IS_ERR(trans)) 39521ab86aedSSage Weil goto out_drop; 39531ab86aedSSage Weil 39541ab86aedSSage Weil file->private_data = trans; 39551ab86aedSSage Weil return 0; 39561ab86aedSSage Weil 39571ab86aedSSage Weil out_drop: 3958a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 39592a79f17eSAl Viro mnt_drop_write_file(file); 3960f46b5a66SChristoph Hellwig out: 3961f46b5a66SChristoph Hellwig return ret; 3962f46b5a66SChristoph Hellwig } 3963f46b5a66SChristoph Hellwig 39646ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 39656ef5ed0dSJosef Bacik { 3966496ad9aaSAl Viro struct inode *inode = file_inode(file); 39676ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 39686ef5ed0dSJosef Bacik struct btrfs_root *new_root; 39696ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 39706ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 39716ef5ed0dSJosef Bacik struct btrfs_path *path; 39726ef5ed0dSJosef Bacik struct btrfs_key location; 39736ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 39746ef5ed0dSJosef Bacik u64 objectid = 0; 39756ef5ed0dSJosef Bacik u64 dir_id; 39763c04ce01SMiao Xie int ret; 39776ef5ed0dSJosef Bacik 39786ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 39796ef5ed0dSJosef Bacik return -EPERM; 39806ef5ed0dSJosef Bacik 39813c04ce01SMiao Xie ret = mnt_want_write_file(file); 39823c04ce01SMiao Xie if (ret) 39833c04ce01SMiao Xie return ret; 39843c04ce01SMiao Xie 39853c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 39863c04ce01SMiao Xie ret = -EFAULT; 39873c04ce01SMiao Xie goto out; 39883c04ce01SMiao Xie } 39896ef5ed0dSJosef Bacik 39906ef5ed0dSJosef Bacik if (!objectid) 39911cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 39926ef5ed0dSJosef Bacik 39936ef5ed0dSJosef Bacik location.objectid = objectid; 39946ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 39956ef5ed0dSJosef Bacik location.offset = (u64)-1; 39966ef5ed0dSJosef Bacik 39976ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 39983c04ce01SMiao Xie if (IS_ERR(new_root)) { 39993c04ce01SMiao Xie ret = PTR_ERR(new_root); 40003c04ce01SMiao Xie goto out; 40013c04ce01SMiao Xie } 40026ef5ed0dSJosef Bacik 40036ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 40043c04ce01SMiao Xie if (!path) { 40053c04ce01SMiao Xie ret = -ENOMEM; 40063c04ce01SMiao Xie goto out; 40073c04ce01SMiao Xie } 40086ef5ed0dSJosef Bacik path->leave_spinning = 1; 40096ef5ed0dSJosef Bacik 40106ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 401198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 40126ef5ed0dSJosef Bacik btrfs_free_path(path); 40133c04ce01SMiao Xie ret = PTR_ERR(trans); 40143c04ce01SMiao Xie goto out; 40156ef5ed0dSJosef Bacik } 40166ef5ed0dSJosef Bacik 40176c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 40186ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 40196ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 4020cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 40216ef5ed0dSJosef Bacik btrfs_free_path(path); 40226ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 4023efe120a0SFrank Holton btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" 4024efe120a0SFrank Holton "item, this isn't going to work"); 40253c04ce01SMiao Xie ret = -ENOENT; 40263c04ce01SMiao Xie goto out; 40276ef5ed0dSJosef Bacik } 40286ef5ed0dSJosef Bacik 40296ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 40306ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 40316ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 40326ef5ed0dSJosef Bacik btrfs_free_path(path); 40336ef5ed0dSJosef Bacik 40342b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 40356ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 40363c04ce01SMiao Xie out: 40373c04ce01SMiao Xie mnt_drop_write_file(file); 40383c04ce01SMiao Xie return ret; 40396ef5ed0dSJosef Bacik } 40406ef5ed0dSJosef Bacik 40415af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 4042bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 4043bf5fc093SJosef Bacik { 4044bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 4045bf5fc093SJosef Bacik 4046bf5fc093SJosef Bacik space->total_bytes = 0; 4047bf5fc093SJosef Bacik space->used_bytes = 0; 4048bf5fc093SJosef Bacik space->flags = 0; 4049bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 4050bf5fc093SJosef Bacik space->flags = block_group->flags; 4051bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 4052bf5fc093SJosef Bacik space->used_bytes += 4053bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 4054bf5fc093SJosef Bacik } 4055bf5fc093SJosef Bacik } 4056bf5fc093SJosef Bacik 405748a3b636SEric Sandeen static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 40581406e432SJosef Bacik { 40591406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 40601406e432SJosef Bacik struct btrfs_ioctl_space_info space; 40611406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 40627fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 406313f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 40641406e432SJosef Bacik struct btrfs_space_info *info; 4065bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 4066bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 4067bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 4068bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 4069bf5fc093SJosef Bacik int num_types = 4; 40707fde62bfSChris Mason int alloc_size; 40711406e432SJosef Bacik int ret = 0; 407251788b1bSDan Rosenberg u64 slot_count = 0; 4073bf5fc093SJosef Bacik int i, c; 40741406e432SJosef Bacik 40751406e432SJosef Bacik if (copy_from_user(&space_args, 40761406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 40771406e432SJosef Bacik sizeof(space_args))) 40781406e432SJosef Bacik return -EFAULT; 40791406e432SJosef Bacik 4080bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4081bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4082bf5fc093SJosef Bacik 4083bf5fc093SJosef Bacik info = NULL; 40847fde62bfSChris Mason rcu_read_lock(); 4085bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4086bf5fc093SJosef Bacik list) { 4087bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4088bf5fc093SJosef Bacik info = tmp; 4089bf5fc093SJosef Bacik break; 4090bf5fc093SJosef Bacik } 4091bf5fc093SJosef Bacik } 40927fde62bfSChris Mason rcu_read_unlock(); 40931406e432SJosef Bacik 4094bf5fc093SJosef Bacik if (!info) 4095bf5fc093SJosef Bacik continue; 4096bf5fc093SJosef Bacik 4097bf5fc093SJosef Bacik down_read(&info->groups_sem); 4098bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4099bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 4100bf5fc093SJosef Bacik slot_count++; 4101bf5fc093SJosef Bacik } 4102bf5fc093SJosef Bacik up_read(&info->groups_sem); 4103bf5fc093SJosef Bacik } 4104bf5fc093SJosef Bacik 410536523e95SDavid Sterba /* 410636523e95SDavid Sterba * Global block reserve, exported as a space_info 410736523e95SDavid Sterba */ 410836523e95SDavid Sterba slot_count++; 410936523e95SDavid Sterba 41107fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 41117fde62bfSChris Mason if (space_args.space_slots == 0) { 41127fde62bfSChris Mason space_args.total_spaces = slot_count; 41137fde62bfSChris Mason goto out; 41147fde62bfSChris Mason } 4115bf5fc093SJosef Bacik 411651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 4117bf5fc093SJosef Bacik 41187fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 4119bf5fc093SJosef Bacik 41207fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 41217fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 41227fde62bfSChris Mason */ 41237fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 41247fde62bfSChris Mason return -ENOMEM; 41257fde62bfSChris Mason 41267fde62bfSChris Mason space_args.total_spaces = 0; 41278d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 41287fde62bfSChris Mason if (!dest) 41297fde62bfSChris Mason return -ENOMEM; 41307fde62bfSChris Mason dest_orig = dest; 41317fde62bfSChris Mason 41327fde62bfSChris Mason /* now we have a buffer to copy into */ 4133bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4134bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4135bf5fc093SJosef Bacik 413651788b1bSDan Rosenberg if (!slot_count) 413751788b1bSDan Rosenberg break; 413851788b1bSDan Rosenberg 4139bf5fc093SJosef Bacik info = NULL; 41401406e432SJosef Bacik rcu_read_lock(); 4141bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 4142bf5fc093SJosef Bacik list) { 4143bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4144bf5fc093SJosef Bacik info = tmp; 41457fde62bfSChris Mason break; 4146bf5fc093SJosef Bacik } 4147bf5fc093SJosef Bacik } 4148bf5fc093SJosef Bacik rcu_read_unlock(); 41497fde62bfSChris Mason 4150bf5fc093SJosef Bacik if (!info) 4151bf5fc093SJosef Bacik continue; 4152bf5fc093SJosef Bacik down_read(&info->groups_sem); 4153bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4154bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 41555af3e8ccSStefan Behrens btrfs_get_block_group_info( 41565af3e8ccSStefan Behrens &info->block_groups[c], &space); 41577fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 41581406e432SJosef Bacik dest++; 41591406e432SJosef Bacik space_args.total_spaces++; 416051788b1bSDan Rosenberg slot_count--; 41611406e432SJosef Bacik } 416251788b1bSDan Rosenberg if (!slot_count) 416351788b1bSDan Rosenberg break; 4164bf5fc093SJosef Bacik } 4165bf5fc093SJosef Bacik up_read(&info->groups_sem); 4166bf5fc093SJosef Bacik } 41671406e432SJosef Bacik 416836523e95SDavid Sterba /* 416936523e95SDavid Sterba * Add global block reserve 417036523e95SDavid Sterba */ 417136523e95SDavid Sterba if (slot_count) { 417236523e95SDavid Sterba struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; 417336523e95SDavid Sterba 417436523e95SDavid Sterba spin_lock(&block_rsv->lock); 417536523e95SDavid Sterba space.total_bytes = block_rsv->size; 417636523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 417736523e95SDavid Sterba spin_unlock(&block_rsv->lock); 417836523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 417936523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 418036523e95SDavid Sterba space_args.total_spaces++; 418136523e95SDavid Sterba } 418236523e95SDavid Sterba 41832eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 41847fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 41857fde62bfSChris Mason 41867fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 41877fde62bfSChris Mason ret = -EFAULT; 41887fde62bfSChris Mason 41897fde62bfSChris Mason kfree(dest_orig); 41907fde62bfSChris Mason out: 41917fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 41921406e432SJosef Bacik ret = -EFAULT; 41931406e432SJosef Bacik 41941406e432SJosef Bacik return ret; 41951406e432SJosef Bacik } 41961406e432SJosef Bacik 4197f46b5a66SChristoph Hellwig /* 4198f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 4199f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 4200f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 4201f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 4202f46b5a66SChristoph Hellwig */ 4203f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 4204f46b5a66SChristoph Hellwig { 4205496ad9aaSAl Viro struct inode *inode = file_inode(file); 4206f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 4207f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4208f46b5a66SChristoph Hellwig 4209f46b5a66SChristoph Hellwig trans = file->private_data; 42101ab86aedSSage Weil if (!trans) 42111ab86aedSSage Weil return -EINVAL; 4212b214107eSChristoph Hellwig file->private_data = NULL; 42139ca9ee09SSage Weil 42141ab86aedSSage Weil btrfs_end_transaction(trans, root); 42151ab86aedSSage Weil 4216a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 42179ca9ee09SSage Weil 42182a79f17eSAl Viro mnt_drop_write_file(file); 42191ab86aedSSage Weil return 0; 4220f46b5a66SChristoph Hellwig } 4221f46b5a66SChristoph Hellwig 42229a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 42239a8c28beSMiao Xie void __user *argp) 422446204592SSage Weil { 422546204592SSage Weil struct btrfs_trans_handle *trans; 422646204592SSage Weil u64 transid; 4227db5b493aSTsutomu Itoh int ret; 422846204592SSage Weil 4229d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4230ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4231ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 423298d5dc13STsutomu Itoh return PTR_ERR(trans); 4233ff7c1d33SMiao Xie 4234ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4235ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4236ff7c1d33SMiao Xie goto out; 4237ff7c1d33SMiao Xie } 423846204592SSage Weil transid = trans->transid; 4239db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 42408b2b2d3cSTsutomu Itoh if (ret) { 42418b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 4242db5b493aSTsutomu Itoh return ret; 42438b2b2d3cSTsutomu Itoh } 4244ff7c1d33SMiao Xie out: 424546204592SSage Weil if (argp) 424646204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 424746204592SSage Weil return -EFAULT; 424846204592SSage Weil return 0; 424946204592SSage Weil } 425046204592SSage Weil 42519a8c28beSMiao Xie static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, 42529a8c28beSMiao Xie void __user *argp) 425346204592SSage Weil { 425446204592SSage Weil u64 transid; 425546204592SSage Weil 425646204592SSage Weil if (argp) { 425746204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 425846204592SSage Weil return -EFAULT; 425946204592SSage Weil } else { 426046204592SSage Weil transid = 0; /* current trans */ 426146204592SSage Weil } 426246204592SSage Weil return btrfs_wait_for_commit(root, transid); 426346204592SSage Weil } 426446204592SSage Weil 4265b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4266475f6387SJan Schmidt { 4267496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4268475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4269b8e95489SMiao Xie int ret; 4270475f6387SJan Schmidt 4271475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4272475f6387SJan Schmidt return -EPERM; 4273475f6387SJan Schmidt 4274475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4275475f6387SJan Schmidt if (IS_ERR(sa)) 4276475f6387SJan Schmidt return PTR_ERR(sa); 4277475f6387SJan Schmidt 4278b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4279b8e95489SMiao Xie ret = mnt_want_write_file(file); 4280b8e95489SMiao Xie if (ret) 4281b8e95489SMiao Xie goto out; 4282b8e95489SMiao Xie } 4283b8e95489SMiao Xie 4284aa1b8cd4SStefan Behrens ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, 428563a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 428663a212abSStefan Behrens 0); 4287475f6387SJan Schmidt 4288475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4289475f6387SJan Schmidt ret = -EFAULT; 4290475f6387SJan Schmidt 4291b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4292b8e95489SMiao Xie mnt_drop_write_file(file); 4293b8e95489SMiao Xie out: 4294475f6387SJan Schmidt kfree(sa); 4295475f6387SJan Schmidt return ret; 4296475f6387SJan Schmidt } 4297475f6387SJan Schmidt 4298475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 4299475f6387SJan Schmidt { 4300475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4301475f6387SJan Schmidt return -EPERM; 4302475f6387SJan Schmidt 4303aa1b8cd4SStefan Behrens return btrfs_scrub_cancel(root->fs_info); 4304475f6387SJan Schmidt } 4305475f6387SJan Schmidt 4306475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 4307475f6387SJan Schmidt void __user *arg) 4308475f6387SJan Schmidt { 4309475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4310475f6387SJan Schmidt int ret; 4311475f6387SJan Schmidt 4312475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4313475f6387SJan Schmidt return -EPERM; 4314475f6387SJan Schmidt 4315475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4316475f6387SJan Schmidt if (IS_ERR(sa)) 4317475f6387SJan Schmidt return PTR_ERR(sa); 4318475f6387SJan Schmidt 4319475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 4320475f6387SJan Schmidt 4321475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 4322475f6387SJan Schmidt ret = -EFAULT; 4323475f6387SJan Schmidt 4324475f6387SJan Schmidt kfree(sa); 4325475f6387SJan Schmidt return ret; 4326475f6387SJan Schmidt } 4327475f6387SJan Schmidt 4328c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 4329b27f7c0cSDavid Sterba void __user *arg) 4330c11d2c23SStefan Behrens { 4331c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4332c11d2c23SStefan Behrens int ret; 4333c11d2c23SStefan Behrens 4334c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4335c11d2c23SStefan Behrens if (IS_ERR(sa)) 4336c11d2c23SStefan Behrens return PTR_ERR(sa); 4337c11d2c23SStefan Behrens 4338b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4339b27f7c0cSDavid Sterba kfree(sa); 4340b27f7c0cSDavid Sterba return -EPERM; 4341b27f7c0cSDavid Sterba } 4342b27f7c0cSDavid Sterba 4343b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 4344c11d2c23SStefan Behrens 4345c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 4346c11d2c23SStefan Behrens ret = -EFAULT; 4347c11d2c23SStefan Behrens 4348c11d2c23SStefan Behrens kfree(sa); 4349c11d2c23SStefan Behrens return ret; 4350c11d2c23SStefan Behrens } 4351c11d2c23SStefan Behrens 43523f6bcfbdSStefan Behrens static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) 43533f6bcfbdSStefan Behrens { 43543f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 43553f6bcfbdSStefan Behrens int ret; 43563f6bcfbdSStefan Behrens 43573f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 43583f6bcfbdSStefan Behrens return -EPERM; 43593f6bcfbdSStefan Behrens 43603f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 43613f6bcfbdSStefan Behrens if (IS_ERR(p)) 43623f6bcfbdSStefan Behrens return PTR_ERR(p); 43633f6bcfbdSStefan Behrens 43643f6bcfbdSStefan Behrens switch (p->cmd) { 43653f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4366adfa97cbSIlya Dryomov if (root->fs_info->sb->s_flags & MS_RDONLY) { 4367adfa97cbSIlya Dryomov ret = -EROFS; 4368adfa97cbSIlya Dryomov goto out; 4369adfa97cbSIlya Dryomov } 43703f6bcfbdSStefan Behrens if (atomic_xchg( 43713f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 43723f6bcfbdSStefan Behrens 1)) { 4373e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 43743f6bcfbdSStefan Behrens } else { 43753f6bcfbdSStefan Behrens ret = btrfs_dev_replace_start(root, p); 43763f6bcfbdSStefan Behrens atomic_set( 43773f6bcfbdSStefan Behrens &root->fs_info->mutually_exclusive_operation_running, 43783f6bcfbdSStefan Behrens 0); 43793f6bcfbdSStefan Behrens } 43803f6bcfbdSStefan Behrens break; 43813f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 43823f6bcfbdSStefan Behrens btrfs_dev_replace_status(root->fs_info, p); 43833f6bcfbdSStefan Behrens ret = 0; 43843f6bcfbdSStefan Behrens break; 43853f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 43863f6bcfbdSStefan Behrens ret = btrfs_dev_replace_cancel(root->fs_info, p); 43873f6bcfbdSStefan Behrens break; 43883f6bcfbdSStefan Behrens default: 43893f6bcfbdSStefan Behrens ret = -EINVAL; 43903f6bcfbdSStefan Behrens break; 43913f6bcfbdSStefan Behrens } 43923f6bcfbdSStefan Behrens 43933f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 43943f6bcfbdSStefan Behrens ret = -EFAULT; 4395adfa97cbSIlya Dryomov out: 43963f6bcfbdSStefan Behrens kfree(p); 43973f6bcfbdSStefan Behrens return ret; 43983f6bcfbdSStefan Behrens } 43993f6bcfbdSStefan Behrens 4400d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4401d7728c96SJan Schmidt { 4402d7728c96SJan Schmidt int ret = 0; 4403d7728c96SJan Schmidt int i; 4404740c3d22SChris Mason u64 rel_ptr; 4405d7728c96SJan Schmidt int size; 4406806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4407d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4408d7728c96SJan Schmidt struct btrfs_path *path; 4409d7728c96SJan Schmidt 441082b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4411d7728c96SJan Schmidt return -EPERM; 4412d7728c96SJan Schmidt 4413d7728c96SJan Schmidt path = btrfs_alloc_path(); 4414d7728c96SJan Schmidt if (!path) { 4415d7728c96SJan Schmidt ret = -ENOMEM; 4416d7728c96SJan Schmidt goto out; 4417d7728c96SJan Schmidt } 4418d7728c96SJan Schmidt 4419d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4420d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4421d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4422d7728c96SJan Schmidt ipa = NULL; 4423d7728c96SJan Schmidt goto out; 4424d7728c96SJan Schmidt } 4425d7728c96SJan Schmidt 4426d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4427d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4428d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4429d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4430d7728c96SJan Schmidt ipath = NULL; 4431d7728c96SJan Schmidt goto out; 4432d7728c96SJan Schmidt } 4433d7728c96SJan Schmidt 4434d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4435d7728c96SJan Schmidt if (ret < 0) 4436d7728c96SJan Schmidt goto out; 4437d7728c96SJan Schmidt 4438d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4439745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4440745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4441740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4442d7728c96SJan Schmidt } 4443d7728c96SJan Schmidt 4444745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 4445745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 4446d7728c96SJan Schmidt if (ret) { 4447d7728c96SJan Schmidt ret = -EFAULT; 4448d7728c96SJan Schmidt goto out; 4449d7728c96SJan Schmidt } 4450d7728c96SJan Schmidt 4451d7728c96SJan Schmidt out: 4452d7728c96SJan Schmidt btrfs_free_path(path); 4453d7728c96SJan Schmidt free_ipath(ipath); 4454d7728c96SJan Schmidt kfree(ipa); 4455d7728c96SJan Schmidt 4456d7728c96SJan Schmidt return ret; 4457d7728c96SJan Schmidt } 4458d7728c96SJan Schmidt 4459d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4460d7728c96SJan Schmidt { 4461d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4462d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4463d7728c96SJan Schmidt 4464d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4465d7728c96SJan Schmidt inodes->bytes_left -= c; 4466d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4467d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4468d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4469d7728c96SJan Schmidt inodes->elem_cnt += 3; 4470d7728c96SJan Schmidt } else { 4471d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4472d7728c96SJan Schmidt inodes->bytes_left = 0; 4473d7728c96SJan Schmidt inodes->elem_missed += 3; 4474d7728c96SJan Schmidt } 4475d7728c96SJan Schmidt 4476d7728c96SJan Schmidt return 0; 4477d7728c96SJan Schmidt } 4478d7728c96SJan Schmidt 4479d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 4480d7728c96SJan Schmidt void __user *arg) 4481d7728c96SJan Schmidt { 4482d7728c96SJan Schmidt int ret = 0; 4483d7728c96SJan Schmidt int size; 4484d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4485d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4486d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4487d7728c96SJan Schmidt 4488d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4489d7728c96SJan Schmidt return -EPERM; 4490d7728c96SJan Schmidt 4491d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 4492d7728c96SJan Schmidt if (IS_ERR(loi)) { 4493d7728c96SJan Schmidt ret = PTR_ERR(loi); 4494d7728c96SJan Schmidt loi = NULL; 4495d7728c96SJan Schmidt goto out; 4496d7728c96SJan Schmidt } 4497d7728c96SJan Schmidt 4498d7728c96SJan Schmidt path = btrfs_alloc_path(); 4499d7728c96SJan Schmidt if (!path) { 4500d7728c96SJan Schmidt ret = -ENOMEM; 4501d7728c96SJan Schmidt goto out; 4502d7728c96SJan Schmidt } 4503d7728c96SJan Schmidt 4504ee22184bSByongho Lee size = min_t(u32, loi->size, SZ_64K); 4505d7728c96SJan Schmidt inodes = init_data_container(size); 4506d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4507d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4508d7728c96SJan Schmidt inodes = NULL; 4509d7728c96SJan Schmidt goto out; 4510d7728c96SJan Schmidt } 4511d7728c96SJan Schmidt 4512df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 4513df031f07SLiu Bo build_ino_list, inodes); 4514df031f07SLiu Bo if (ret == -EINVAL) 4515d7728c96SJan Schmidt ret = -ENOENT; 4516d7728c96SJan Schmidt if (ret < 0) 4517d7728c96SJan Schmidt goto out; 4518d7728c96SJan Schmidt 4519745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 4520745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 4521d7728c96SJan Schmidt if (ret) 4522d7728c96SJan Schmidt ret = -EFAULT; 4523d7728c96SJan Schmidt 4524d7728c96SJan Schmidt out: 4525d7728c96SJan Schmidt btrfs_free_path(path); 4526425d17a2SLiu Bo vfree(inodes); 4527d7728c96SJan Schmidt kfree(loi); 4528d7728c96SJan Schmidt 4529d7728c96SJan Schmidt return ret; 4530d7728c96SJan Schmidt } 4531d7728c96SJan Schmidt 453219a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 4533c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4534c9e9f97bSIlya Dryomov { 4535c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4536c9e9f97bSIlya Dryomov 4537c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4538c9e9f97bSIlya Dryomov 4539837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 4540837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4541837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4542837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4543a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4544a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4545837d5b6eSIlya Dryomov 4546c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4547c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4548c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 454919a39dceSIlya Dryomov 455019a39dceSIlya Dryomov if (lock) { 455119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 455219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 455319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 455419a39dceSIlya Dryomov } else { 455519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 455619a39dceSIlya Dryomov } 4557c9e9f97bSIlya Dryomov } 4558c9e9f97bSIlya Dryomov 45599ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4560c9e9f97bSIlya Dryomov { 4561496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4562c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4563c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4564c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4565ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4566c9e9f97bSIlya Dryomov int ret; 4567c9e9f97bSIlya Dryomov 4568c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4569c9e9f97bSIlya Dryomov return -EPERM; 4570c9e9f97bSIlya Dryomov 4571e54bfa31SLiu Bo ret = mnt_want_write_file(file); 45729ba1f6e4SLiu Bo if (ret) 45739ba1f6e4SLiu Bo return ret; 45749ba1f6e4SLiu Bo 4575ed0fb78fSIlya Dryomov again: 4576ed0fb78fSIlya Dryomov if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { 4577c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 4578c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4579ed0fb78fSIlya Dryomov need_unlock = true; 4580ed0fb78fSIlya Dryomov goto locked; 4581ed0fb78fSIlya Dryomov } 4582ed0fb78fSIlya Dryomov 4583ed0fb78fSIlya Dryomov /* 4584ed0fb78fSIlya Dryomov * mut. excl. ops lock is locked. Three possibilites: 4585ed0fb78fSIlya Dryomov * (1) some other op is running 4586ed0fb78fSIlya Dryomov * (2) balance is running 4587ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4588ed0fb78fSIlya Dryomov */ 4589ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4590ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4591ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 4592ed0fb78fSIlya Dryomov if (!atomic_read(&fs_info->balance_running)) { 4593ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4594ed0fb78fSIlya Dryomov if (!mutex_trylock(&fs_info->volume_mutex)) 4595ed0fb78fSIlya Dryomov goto again; 4596ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4597ed0fb78fSIlya Dryomov 4598ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 4599ed0fb78fSIlya Dryomov !atomic_read(&fs_info->balance_running)) { 4600ed0fb78fSIlya Dryomov /* this is (3) */ 4601ed0fb78fSIlya Dryomov need_unlock = false; 4602ed0fb78fSIlya Dryomov goto locked; 4603ed0fb78fSIlya Dryomov } 4604ed0fb78fSIlya Dryomov 4605ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4606ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4607ed0fb78fSIlya Dryomov goto again; 4608ed0fb78fSIlya Dryomov } else { 4609ed0fb78fSIlya Dryomov /* this is (2) */ 4610ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4611ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4612ed0fb78fSIlya Dryomov goto out; 4613ed0fb78fSIlya Dryomov } 4614ed0fb78fSIlya Dryomov } else { 4615ed0fb78fSIlya Dryomov /* this is (1) */ 4616ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4617e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4618ed0fb78fSIlya Dryomov goto out; 4619ed0fb78fSIlya Dryomov } 4620ed0fb78fSIlya Dryomov 4621ed0fb78fSIlya Dryomov locked: 4622ed0fb78fSIlya Dryomov BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); 4623c9e9f97bSIlya Dryomov 4624c9e9f97bSIlya Dryomov if (arg) { 4625c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4626c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4627c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4628ed0fb78fSIlya Dryomov goto out_unlock; 4629c9e9f97bSIlya Dryomov } 4630de322263SIlya Dryomov 4631de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4632de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4633de322263SIlya Dryomov ret = -ENOTCONN; 4634de322263SIlya Dryomov goto out_bargs; 4635de322263SIlya Dryomov } 4636de322263SIlya Dryomov 4637de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4638de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4639de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4640de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4641de322263SIlya Dryomov 4642de322263SIlya Dryomov goto do_balance; 4643de322263SIlya Dryomov } 4644c9e9f97bSIlya Dryomov } else { 4645c9e9f97bSIlya Dryomov bargs = NULL; 4646c9e9f97bSIlya Dryomov } 4647c9e9f97bSIlya Dryomov 4648ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4649837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4650837d5b6eSIlya Dryomov goto out_bargs; 4651837d5b6eSIlya Dryomov } 4652837d5b6eSIlya Dryomov 46538d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4654c9e9f97bSIlya Dryomov if (!bctl) { 4655c9e9f97bSIlya Dryomov ret = -ENOMEM; 4656c9e9f97bSIlya Dryomov goto out_bargs; 4657c9e9f97bSIlya Dryomov } 4658c9e9f97bSIlya Dryomov 4659c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 4660c9e9f97bSIlya Dryomov if (arg) { 4661c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4662c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4663c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4664c9e9f97bSIlya Dryomov 4665c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4666f43ffb60SIlya Dryomov } else { 4667f43ffb60SIlya Dryomov /* balance everything - no filters */ 4668f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4669c9e9f97bSIlya Dryomov } 4670c9e9f97bSIlya Dryomov 46718eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 46728eb93459SDavid Sterba ret = -EINVAL; 46730f89abf5SChristian Engelmayer goto out_bctl; 46748eb93459SDavid Sterba } 46758eb93459SDavid Sterba 4676de322263SIlya Dryomov do_balance: 4677c9e9f97bSIlya Dryomov /* 4678ed0fb78fSIlya Dryomov * Ownership of bctl and mutually_exclusive_operation_running 4679ed0fb78fSIlya Dryomov * goes to to btrfs_balance. bctl is freed in __cancel_balance, 4680ed0fb78fSIlya Dryomov * or, if restriper was paused all the way until unmount, in 4681ed0fb78fSIlya Dryomov * free_fs_info. mutually_exclusive_operation_running is 4682ed0fb78fSIlya Dryomov * cleared in __cancel_balance. 4683c9e9f97bSIlya Dryomov */ 4684ed0fb78fSIlya Dryomov need_unlock = false; 4685ed0fb78fSIlya Dryomov 4686ed0fb78fSIlya Dryomov ret = btrfs_balance(bctl, bargs); 46870f89abf5SChristian Engelmayer bctl = NULL; 4688ed0fb78fSIlya Dryomov 4689c9e9f97bSIlya Dryomov if (arg) { 4690c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4691c9e9f97bSIlya Dryomov ret = -EFAULT; 4692c9e9f97bSIlya Dryomov } 4693c9e9f97bSIlya Dryomov 46940f89abf5SChristian Engelmayer out_bctl: 46950f89abf5SChristian Engelmayer kfree(bctl); 4696c9e9f97bSIlya Dryomov out_bargs: 4697c9e9f97bSIlya Dryomov kfree(bargs); 4698ed0fb78fSIlya Dryomov out_unlock: 4699c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4700c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 4701ed0fb78fSIlya Dryomov if (need_unlock) 4702ed0fb78fSIlya Dryomov atomic_set(&fs_info->mutually_exclusive_operation_running, 0); 4703ed0fb78fSIlya Dryomov out: 4704e54bfa31SLiu Bo mnt_drop_write_file(file); 4705c9e9f97bSIlya Dryomov return ret; 4706c9e9f97bSIlya Dryomov } 4707c9e9f97bSIlya Dryomov 4708837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 4709837d5b6eSIlya Dryomov { 4710837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4711837d5b6eSIlya Dryomov return -EPERM; 4712837d5b6eSIlya Dryomov 4713837d5b6eSIlya Dryomov switch (cmd) { 4714837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 4715837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 4716a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 4717a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 4718837d5b6eSIlya Dryomov } 4719837d5b6eSIlya Dryomov 4720837d5b6eSIlya Dryomov return -EINVAL; 4721837d5b6eSIlya Dryomov } 4722837d5b6eSIlya Dryomov 472319a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 472419a39dceSIlya Dryomov void __user *arg) 472519a39dceSIlya Dryomov { 472619a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 472719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 472819a39dceSIlya Dryomov int ret = 0; 472919a39dceSIlya Dryomov 473019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 473119a39dceSIlya Dryomov return -EPERM; 473219a39dceSIlya Dryomov 473319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 473419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 473519a39dceSIlya Dryomov ret = -ENOTCONN; 473619a39dceSIlya Dryomov goto out; 473719a39dceSIlya Dryomov } 473819a39dceSIlya Dryomov 47398d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 474019a39dceSIlya Dryomov if (!bargs) { 474119a39dceSIlya Dryomov ret = -ENOMEM; 474219a39dceSIlya Dryomov goto out; 474319a39dceSIlya Dryomov } 474419a39dceSIlya Dryomov 474519a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 474619a39dceSIlya Dryomov 474719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 474819a39dceSIlya Dryomov ret = -EFAULT; 474919a39dceSIlya Dryomov 475019a39dceSIlya Dryomov kfree(bargs); 475119a39dceSIlya Dryomov out: 475219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 475319a39dceSIlya Dryomov return ret; 475419a39dceSIlya Dryomov } 475519a39dceSIlya Dryomov 4756905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 47575d13a37bSArne Jansen { 4758496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 47595d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 47605d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 47615d13a37bSArne Jansen int ret; 47625d13a37bSArne Jansen int err; 47635d13a37bSArne Jansen 47645d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47655d13a37bSArne Jansen return -EPERM; 47665d13a37bSArne Jansen 4767905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4768905b0ddaSMiao Xie if (ret) 4769905b0ddaSMiao Xie return ret; 47705d13a37bSArne Jansen 47715d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4772905b0ddaSMiao Xie if (IS_ERR(sa)) { 4773905b0ddaSMiao Xie ret = PTR_ERR(sa); 4774905b0ddaSMiao Xie goto drop_write; 4775905b0ddaSMiao Xie } 47765d13a37bSArne Jansen 47777708f029SWang Shilong down_write(&root->fs_info->subvol_sem); 477892f183aaSWang Shilong trans = btrfs_start_transaction(root->fs_info->tree_root, 2); 47795d13a37bSArne Jansen if (IS_ERR(trans)) { 47805d13a37bSArne Jansen ret = PTR_ERR(trans); 47815d13a37bSArne Jansen goto out; 47825d13a37bSArne Jansen } 47835d13a37bSArne Jansen 47845d13a37bSArne Jansen switch (sa->cmd) { 47855d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 47865d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 47875d13a37bSArne Jansen break; 47885d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 47895d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 47905d13a37bSArne Jansen break; 47915d13a37bSArne Jansen default: 47925d13a37bSArne Jansen ret = -EINVAL; 47935d13a37bSArne Jansen break; 47945d13a37bSArne Jansen } 47955d13a37bSArne Jansen 479692f183aaSWang Shilong err = btrfs_commit_transaction(trans, root->fs_info->tree_root); 47975d13a37bSArne Jansen if (err && !ret) 47985d13a37bSArne Jansen ret = err; 47995d13a37bSArne Jansen out: 48005d13a37bSArne Jansen kfree(sa); 48017708f029SWang Shilong up_write(&root->fs_info->subvol_sem); 4802905b0ddaSMiao Xie drop_write: 4803905b0ddaSMiao Xie mnt_drop_write_file(file); 48045d13a37bSArne Jansen return ret; 48055d13a37bSArne Jansen } 48065d13a37bSArne Jansen 4807905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 48085d13a37bSArne Jansen { 4809496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48105d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 48115d13a37bSArne Jansen struct btrfs_trans_handle *trans; 48125d13a37bSArne Jansen int ret; 48135d13a37bSArne Jansen int err; 48145d13a37bSArne Jansen 48155d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 48165d13a37bSArne Jansen return -EPERM; 48175d13a37bSArne Jansen 4818905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4819905b0ddaSMiao Xie if (ret) 4820905b0ddaSMiao Xie return ret; 48215d13a37bSArne Jansen 48225d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4823905b0ddaSMiao Xie if (IS_ERR(sa)) { 4824905b0ddaSMiao Xie ret = PTR_ERR(sa); 4825905b0ddaSMiao Xie goto drop_write; 4826905b0ddaSMiao Xie } 48275d13a37bSArne Jansen 48285d13a37bSArne Jansen trans = btrfs_join_transaction(root); 48295d13a37bSArne Jansen if (IS_ERR(trans)) { 48305d13a37bSArne Jansen ret = PTR_ERR(trans); 48315d13a37bSArne Jansen goto out; 48325d13a37bSArne Jansen } 48335d13a37bSArne Jansen 48345d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 48355d13a37bSArne Jansen if (sa->assign) { 48365d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 48375d13a37bSArne Jansen sa->src, sa->dst); 48385d13a37bSArne Jansen } else { 48395d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 48405d13a37bSArne Jansen sa->src, sa->dst); 48415d13a37bSArne Jansen } 48425d13a37bSArne Jansen 4843e082f563SQu Wenruo /* update qgroup status and info */ 4844e082f563SQu Wenruo err = btrfs_run_qgroups(trans, root->fs_info); 4845e082f563SQu Wenruo if (err < 0) 4846a4553fefSAnand Jain btrfs_std_error(root->fs_info, ret, 4847e082f563SQu Wenruo "failed to update qgroup status and info\n"); 48485d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 48495d13a37bSArne Jansen if (err && !ret) 48505d13a37bSArne Jansen ret = err; 48515d13a37bSArne Jansen 48525d13a37bSArne Jansen out: 48535d13a37bSArne Jansen kfree(sa); 4854905b0ddaSMiao Xie drop_write: 4855905b0ddaSMiao Xie mnt_drop_write_file(file); 48565d13a37bSArne Jansen return ret; 48575d13a37bSArne Jansen } 48585d13a37bSArne Jansen 4859905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 48605d13a37bSArne Jansen { 4861496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 48625d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 48635d13a37bSArne Jansen struct btrfs_trans_handle *trans; 48645d13a37bSArne Jansen int ret; 48655d13a37bSArne Jansen int err; 48665d13a37bSArne Jansen 48675d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 48685d13a37bSArne Jansen return -EPERM; 48695d13a37bSArne Jansen 4870905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4871905b0ddaSMiao Xie if (ret) 4872905b0ddaSMiao Xie return ret; 48735d13a37bSArne Jansen 48745d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4875905b0ddaSMiao Xie if (IS_ERR(sa)) { 4876905b0ddaSMiao Xie ret = PTR_ERR(sa); 4877905b0ddaSMiao Xie goto drop_write; 4878905b0ddaSMiao Xie } 48795d13a37bSArne Jansen 4880d86e56cfSMiao Xie if (!sa->qgroupid) { 4881d86e56cfSMiao Xie ret = -EINVAL; 4882d86e56cfSMiao Xie goto out; 4883d86e56cfSMiao Xie } 4884d86e56cfSMiao Xie 48855d13a37bSArne Jansen trans = btrfs_join_transaction(root); 48865d13a37bSArne Jansen if (IS_ERR(trans)) { 48875d13a37bSArne Jansen ret = PTR_ERR(trans); 48885d13a37bSArne Jansen goto out; 48895d13a37bSArne Jansen } 48905d13a37bSArne Jansen 48915d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 48925d13a37bSArne Jansen if (sa->create) { 48934087cf24SDongsheng Yang ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); 48945d13a37bSArne Jansen } else { 48955d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 48965d13a37bSArne Jansen } 48975d13a37bSArne Jansen 48985d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 48995d13a37bSArne Jansen if (err && !ret) 49005d13a37bSArne Jansen ret = err; 49015d13a37bSArne Jansen 49025d13a37bSArne Jansen out: 49035d13a37bSArne Jansen kfree(sa); 4904905b0ddaSMiao Xie drop_write: 4905905b0ddaSMiao Xie mnt_drop_write_file(file); 49065d13a37bSArne Jansen return ret; 49075d13a37bSArne Jansen } 49085d13a37bSArne Jansen 4909905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 49105d13a37bSArne Jansen { 4911496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49125d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 49135d13a37bSArne Jansen struct btrfs_trans_handle *trans; 49145d13a37bSArne Jansen int ret; 49155d13a37bSArne Jansen int err; 49165d13a37bSArne Jansen u64 qgroupid; 49175d13a37bSArne Jansen 49185d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 49195d13a37bSArne Jansen return -EPERM; 49205d13a37bSArne Jansen 4921905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4922905b0ddaSMiao Xie if (ret) 4923905b0ddaSMiao Xie return ret; 49245d13a37bSArne Jansen 49255d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4926905b0ddaSMiao Xie if (IS_ERR(sa)) { 4927905b0ddaSMiao Xie ret = PTR_ERR(sa); 4928905b0ddaSMiao Xie goto drop_write; 4929905b0ddaSMiao Xie } 49305d13a37bSArne Jansen 49315d13a37bSArne Jansen trans = btrfs_join_transaction(root); 49325d13a37bSArne Jansen if (IS_ERR(trans)) { 49335d13a37bSArne Jansen ret = PTR_ERR(trans); 49345d13a37bSArne Jansen goto out; 49355d13a37bSArne Jansen } 49365d13a37bSArne Jansen 49375d13a37bSArne Jansen qgroupid = sa->qgroupid; 49385d13a37bSArne Jansen if (!qgroupid) { 49395d13a37bSArne Jansen /* take the current subvol as qgroup */ 49405d13a37bSArne Jansen qgroupid = root->root_key.objectid; 49415d13a37bSArne Jansen } 49425d13a37bSArne Jansen 49435d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 49445d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 49455d13a37bSArne Jansen 49465d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 49475d13a37bSArne Jansen if (err && !ret) 49485d13a37bSArne Jansen ret = err; 49495d13a37bSArne Jansen 49505d13a37bSArne Jansen out: 49515d13a37bSArne Jansen kfree(sa); 4952905b0ddaSMiao Xie drop_write: 4953905b0ddaSMiao Xie mnt_drop_write_file(file); 49545d13a37bSArne Jansen return ret; 49555d13a37bSArne Jansen } 49565d13a37bSArne Jansen 49572f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 49582f232036SJan Schmidt { 49596d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49602f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 49612f232036SJan Schmidt int ret; 49622f232036SJan Schmidt 49632f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 49642f232036SJan Schmidt return -EPERM; 49652f232036SJan Schmidt 49662f232036SJan Schmidt ret = mnt_want_write_file(file); 49672f232036SJan Schmidt if (ret) 49682f232036SJan Schmidt return ret; 49692f232036SJan Schmidt 49702f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 49712f232036SJan Schmidt if (IS_ERR(qsa)) { 49722f232036SJan Schmidt ret = PTR_ERR(qsa); 49732f232036SJan Schmidt goto drop_write; 49742f232036SJan Schmidt } 49752f232036SJan Schmidt 49762f232036SJan Schmidt if (qsa->flags) { 49772f232036SJan Schmidt ret = -EINVAL; 49782f232036SJan Schmidt goto out; 49792f232036SJan Schmidt } 49802f232036SJan Schmidt 49812f232036SJan Schmidt ret = btrfs_qgroup_rescan(root->fs_info); 49822f232036SJan Schmidt 49832f232036SJan Schmidt out: 49842f232036SJan Schmidt kfree(qsa); 49852f232036SJan Schmidt drop_write: 49862f232036SJan Schmidt mnt_drop_write_file(file); 49872f232036SJan Schmidt return ret; 49882f232036SJan Schmidt } 49892f232036SJan Schmidt 49902f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 49912f232036SJan Schmidt { 49926d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 49932f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 49942f232036SJan Schmidt int ret = 0; 49952f232036SJan Schmidt 49962f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 49972f232036SJan Schmidt return -EPERM; 49982f232036SJan Schmidt 49998d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 50002f232036SJan Schmidt if (!qsa) 50012f232036SJan Schmidt return -ENOMEM; 50022f232036SJan Schmidt 50032f232036SJan Schmidt if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 50042f232036SJan Schmidt qsa->flags = 1; 50052f232036SJan Schmidt qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; 50062f232036SJan Schmidt } 50072f232036SJan Schmidt 50082f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 50092f232036SJan Schmidt ret = -EFAULT; 50102f232036SJan Schmidt 50112f232036SJan Schmidt kfree(qsa); 50122f232036SJan Schmidt return ret; 50132f232036SJan Schmidt } 50142f232036SJan Schmidt 501557254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 501657254b6eSJan Schmidt { 501754563d41SAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 501857254b6eSJan Schmidt 501957254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 502057254b6eSJan Schmidt return -EPERM; 502157254b6eSJan Schmidt 502257254b6eSJan Schmidt return btrfs_qgroup_wait_for_completion(root->fs_info); 502357254b6eSJan Schmidt } 502457254b6eSJan Schmidt 5025abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 5026abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 50278ea05e3aSAlexander Block { 5028496ad9aaSAl Viro struct inode *inode = file_inode(file); 50298ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 50308ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 50318ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 503204b285f3SDeepa Dinamani struct timespec ct = current_fs_time(inode->i_sb); 50338ea05e3aSAlexander Block int ret = 0; 5034dd5f9615SStefan Behrens int received_uuid_changed; 50358ea05e3aSAlexander Block 5036bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 5037bd60ea0fSDavid Sterba return -EPERM; 5038bd60ea0fSDavid Sterba 50398ea05e3aSAlexander Block ret = mnt_want_write_file(file); 50408ea05e3aSAlexander Block if (ret < 0) 50418ea05e3aSAlexander Block return ret; 50428ea05e3aSAlexander Block 50438ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 50448ea05e3aSAlexander Block 50458ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 50468ea05e3aSAlexander Block ret = -EINVAL; 50478ea05e3aSAlexander Block goto out; 50488ea05e3aSAlexander Block } 50498ea05e3aSAlexander Block 50508ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 50518ea05e3aSAlexander Block ret = -EROFS; 50528ea05e3aSAlexander Block goto out; 50538ea05e3aSAlexander Block } 50548ea05e3aSAlexander Block 5055dd5f9615SStefan Behrens /* 5056dd5f9615SStefan Behrens * 1 - root item 5057dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 5058dd5f9615SStefan Behrens */ 5059dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 50608ea05e3aSAlexander Block if (IS_ERR(trans)) { 50618ea05e3aSAlexander Block ret = PTR_ERR(trans); 50628ea05e3aSAlexander Block trans = NULL; 50638ea05e3aSAlexander Block goto out; 50648ea05e3aSAlexander Block } 50658ea05e3aSAlexander Block 50668ea05e3aSAlexander Block sa->rtransid = trans->transid; 50678ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 50688ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 50698ea05e3aSAlexander Block 5070dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 5071dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 5072dd5f9615SStefan Behrens if (received_uuid_changed && 5073dd5f9615SStefan Behrens !btrfs_is_empty_uuid(root_item->received_uuid)) 5074dd5f9615SStefan Behrens btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, 5075dd5f9615SStefan Behrens root_item->received_uuid, 5076dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5077dd5f9615SStefan Behrens root->root_key.objectid); 50788ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 50798ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 50808ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 50813cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 50823cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 50833cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 50843cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 50858ea05e3aSAlexander Block 50868ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 50878ea05e3aSAlexander Block &root->root_key, &root->root_item); 50888ea05e3aSAlexander Block if (ret < 0) { 50898ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 50908ea05e3aSAlexander Block goto out; 5091dd5f9615SStefan Behrens } 5092dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 5093dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, 5094dd5f9615SStefan Behrens sa->uuid, 5095dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5096dd5f9615SStefan Behrens root->root_key.objectid); 5097dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 5098dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 5099dd5f9615SStefan Behrens goto out; 5100dd5f9615SStefan Behrens } 5101dd5f9615SStefan Behrens } 51028ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 5103dd5f9615SStefan Behrens if (ret < 0) { 5104dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 51058ea05e3aSAlexander Block goto out; 51068ea05e3aSAlexander Block } 51078ea05e3aSAlexander Block 5108abccd00fSHugo Mills out: 5109abccd00fSHugo Mills up_write(&root->fs_info->subvol_sem); 5110abccd00fSHugo Mills mnt_drop_write_file(file); 5111abccd00fSHugo Mills return ret; 5112abccd00fSHugo Mills } 5113abccd00fSHugo Mills 5114abccd00fSHugo Mills #ifdef CONFIG_64BIT 5115abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 5116abccd00fSHugo Mills void __user *arg) 5117abccd00fSHugo Mills { 5118abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 5119abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 5120abccd00fSHugo Mills int ret = 0; 5121abccd00fSHugo Mills 5122abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 5123abccd00fSHugo Mills if (IS_ERR(args32)) { 5124abccd00fSHugo Mills ret = PTR_ERR(args32); 5125abccd00fSHugo Mills args32 = NULL; 5126abccd00fSHugo Mills goto out; 5127abccd00fSHugo Mills } 5128abccd00fSHugo Mills 51298d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 513084dbeb87SDan Carpenter if (!args64) { 513184dbeb87SDan Carpenter ret = -ENOMEM; 5132abccd00fSHugo Mills goto out; 5133abccd00fSHugo Mills } 5134abccd00fSHugo Mills 5135abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 5136abccd00fSHugo Mills args64->stransid = args32->stransid; 5137abccd00fSHugo Mills args64->rtransid = args32->rtransid; 5138abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 5139abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 5140abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 5141abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 5142abccd00fSHugo Mills args64->flags = args32->flags; 5143abccd00fSHugo Mills 5144abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 5145abccd00fSHugo Mills if (ret) 5146abccd00fSHugo Mills goto out; 5147abccd00fSHugo Mills 5148abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 5149abccd00fSHugo Mills args32->stransid = args64->stransid; 5150abccd00fSHugo Mills args32->rtransid = args64->rtransid; 5151abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 5152abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 5153abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 5154abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 5155abccd00fSHugo Mills args32->flags = args64->flags; 5156abccd00fSHugo Mills 5157abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 5158abccd00fSHugo Mills if (ret) 5159abccd00fSHugo Mills ret = -EFAULT; 5160abccd00fSHugo Mills 5161abccd00fSHugo Mills out: 5162abccd00fSHugo Mills kfree(args32); 5163abccd00fSHugo Mills kfree(args64); 5164abccd00fSHugo Mills return ret; 5165abccd00fSHugo Mills } 5166abccd00fSHugo Mills #endif 5167abccd00fSHugo Mills 5168abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 5169abccd00fSHugo Mills void __user *arg) 5170abccd00fSHugo Mills { 5171abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 5172abccd00fSHugo Mills int ret = 0; 5173abccd00fSHugo Mills 5174abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 5175abccd00fSHugo Mills if (IS_ERR(sa)) { 5176abccd00fSHugo Mills ret = PTR_ERR(sa); 5177abccd00fSHugo Mills sa = NULL; 5178abccd00fSHugo Mills goto out; 5179abccd00fSHugo Mills } 5180abccd00fSHugo Mills 5181abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 5182abccd00fSHugo Mills 5183abccd00fSHugo Mills if (ret) 5184abccd00fSHugo Mills goto out; 5185abccd00fSHugo Mills 51868ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 51878ea05e3aSAlexander Block if (ret) 51888ea05e3aSAlexander Block ret = -EFAULT; 51898ea05e3aSAlexander Block 51908ea05e3aSAlexander Block out: 51918ea05e3aSAlexander Block kfree(sa); 51928ea05e3aSAlexander Block return ret; 51938ea05e3aSAlexander Block } 51948ea05e3aSAlexander Block 5195867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 5196867ab667Sjeff.liu { 51976d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5198a1b83ac5SAnand Jain size_t len; 5199867ab667Sjeff.liu int ret; 5200a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5201a1b83ac5SAnand Jain 5202a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5203a1b83ac5SAnand Jain memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); 5204a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5205a1b83ac5SAnand Jain 5206a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5207867ab667Sjeff.liu 5208867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 5209efe120a0SFrank Holton btrfs_warn(root->fs_info, 5210efe120a0SFrank Holton "label is too long, return the first %zu bytes", --len); 5211867ab667Sjeff.liu } 5212867ab667Sjeff.liu 5213867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5214867ab667Sjeff.liu 5215867ab667Sjeff.liu return ret ? -EFAULT : 0; 5216867ab667Sjeff.liu } 5217867ab667Sjeff.liu 5218a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5219a8bfd4abSjeff.liu { 52206d0379ecSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 5221a8bfd4abSjeff.liu struct btrfs_super_block *super_block = root->fs_info->super_copy; 5222a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5223a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5224a8bfd4abSjeff.liu int ret; 5225a8bfd4abSjeff.liu 5226a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5227a8bfd4abSjeff.liu return -EPERM; 5228a8bfd4abSjeff.liu 5229a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5230a8bfd4abSjeff.liu return -EFAULT; 5231a8bfd4abSjeff.liu 5232a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 5233efe120a0SFrank Holton btrfs_err(root->fs_info, "unable to set label with more than %d bytes", 5234a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5235a8bfd4abSjeff.liu return -EINVAL; 5236a8bfd4abSjeff.liu } 5237a8bfd4abSjeff.liu 5238a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5239a8bfd4abSjeff.liu if (ret) 5240a8bfd4abSjeff.liu return ret; 5241a8bfd4abSjeff.liu 5242a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5243a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5244a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5245a8bfd4abSjeff.liu goto out_unlock; 5246a8bfd4abSjeff.liu } 5247a8bfd4abSjeff.liu 5248a1b83ac5SAnand Jain spin_lock(&root->fs_info->super_lock); 5249a8bfd4abSjeff.liu strcpy(super_block->label, label); 5250a1b83ac5SAnand Jain spin_unlock(&root->fs_info->super_lock); 5251d0270acaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 5252a8bfd4abSjeff.liu 5253a8bfd4abSjeff.liu out_unlock: 5254a8bfd4abSjeff.liu mnt_drop_write_file(file); 5255a8bfd4abSjeff.liu return ret; 5256a8bfd4abSjeff.liu } 5257a8bfd4abSjeff.liu 52582eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 52592eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 52602eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 52612eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 52622eaa055fSJeff Mahoney 5263d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 52642eaa055fSJeff Mahoney { 52654d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 52662eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 52672eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 52682eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 52692eaa055fSJeff Mahoney }; 52702eaa055fSJeff Mahoney 52712eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 52722eaa055fSJeff Mahoney return -EFAULT; 52732eaa055fSJeff Mahoney 52742eaa055fSJeff Mahoney return 0; 52752eaa055fSJeff Mahoney } 52762eaa055fSJeff Mahoney 52772eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 52782eaa055fSJeff Mahoney { 52792eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 52802eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 52812eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 52822eaa055fSJeff Mahoney 52832eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 52842eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 52852eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 52862eaa055fSJeff Mahoney 52872eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 52882eaa055fSJeff Mahoney return -EFAULT; 52892eaa055fSJeff Mahoney 52902eaa055fSJeff Mahoney return 0; 52912eaa055fSJeff Mahoney } 52922eaa055fSJeff Mahoney 52933b02a68aSJeff Mahoney static int check_feature_bits(struct btrfs_root *root, 52943b02a68aSJeff Mahoney enum btrfs_feature_set set, 52952eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 52962eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 52972eaa055fSJeff Mahoney { 52983b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 52993b02a68aSJeff Mahoney char *names; 53002eaa055fSJeff Mahoney u64 disallowed, unsupported; 53012eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 53022eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 53032eaa055fSJeff Mahoney 53042eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 53052eaa055fSJeff Mahoney if (unsupported) { 53063b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 53073b02a68aSJeff Mahoney if (names) { 53083b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53093b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 53103b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53113b02a68aSJeff Mahoney kfree(names); 53123b02a68aSJeff Mahoney } else 53132eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53142eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 53152eaa055fSJeff Mahoney type, unsupported); 53162eaa055fSJeff Mahoney return -EOPNOTSUPP; 53172eaa055fSJeff Mahoney } 53182eaa055fSJeff Mahoney 53192eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 53202eaa055fSJeff Mahoney if (disallowed) { 53213b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 53223b02a68aSJeff Mahoney if (names) { 53233b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53243b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 53253b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53263b02a68aSJeff Mahoney kfree(names); 53273b02a68aSJeff Mahoney } else 53282eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53292eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 53302eaa055fSJeff Mahoney type, disallowed); 53312eaa055fSJeff Mahoney return -EPERM; 53322eaa055fSJeff Mahoney } 53332eaa055fSJeff Mahoney 53342eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 53352eaa055fSJeff Mahoney if (disallowed) { 53363b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 53373b02a68aSJeff Mahoney if (names) { 53383b02a68aSJeff Mahoney btrfs_warn(root->fs_info, 53393b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 53403b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 53413b02a68aSJeff Mahoney kfree(names); 53423b02a68aSJeff Mahoney } else 53432eaa055fSJeff Mahoney btrfs_warn(root->fs_info, 53442eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 53452eaa055fSJeff Mahoney type, disallowed); 53462eaa055fSJeff Mahoney return -EPERM; 53472eaa055fSJeff Mahoney } 53482eaa055fSJeff Mahoney 53492eaa055fSJeff Mahoney return 0; 53502eaa055fSJeff Mahoney } 53512eaa055fSJeff Mahoney 53522eaa055fSJeff Mahoney #define check_feature(root, change_mask, flags, mask_base) \ 53533b02a68aSJeff Mahoney check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ 53542eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 53552eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 53562eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 53572eaa055fSJeff Mahoney 53582eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 53592eaa055fSJeff Mahoney { 53602eaa055fSJeff Mahoney struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 53612eaa055fSJeff Mahoney struct btrfs_super_block *super_block = root->fs_info->super_copy; 53622eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 53632eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 53642eaa055fSJeff Mahoney u64 newflags; 53652eaa055fSJeff Mahoney int ret; 53662eaa055fSJeff Mahoney 53672eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 53682eaa055fSJeff Mahoney return -EPERM; 53692eaa055fSJeff Mahoney 53702eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 53712eaa055fSJeff Mahoney return -EFAULT; 53722eaa055fSJeff Mahoney 53732eaa055fSJeff Mahoney /* Nothing to do */ 53742eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 53752eaa055fSJeff Mahoney !flags[0].incompat_flags) 53762eaa055fSJeff Mahoney return 0; 53772eaa055fSJeff Mahoney 53782eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_flags, 53792eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 53802eaa055fSJeff Mahoney if (ret) 53812eaa055fSJeff Mahoney return ret; 53822eaa055fSJeff Mahoney 53832eaa055fSJeff Mahoney ret = check_feature(root, flags[0].compat_ro_flags, 53842eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 53852eaa055fSJeff Mahoney if (ret) 53862eaa055fSJeff Mahoney return ret; 53872eaa055fSJeff Mahoney 53882eaa055fSJeff Mahoney ret = check_feature(root, flags[0].incompat_flags, 53892eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 53902eaa055fSJeff Mahoney if (ret) 53912eaa055fSJeff Mahoney return ret; 53922eaa055fSJeff Mahoney 53938051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 53942eaa055fSJeff Mahoney if (IS_ERR(trans)) 53952eaa055fSJeff Mahoney return PTR_ERR(trans); 53962eaa055fSJeff Mahoney 53972eaa055fSJeff Mahoney spin_lock(&root->fs_info->super_lock); 53982eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 53992eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 54002eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 54012eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 54022eaa055fSJeff Mahoney 54032eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 54042eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 54052eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 54062eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 54072eaa055fSJeff Mahoney 54082eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 54092eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 54102eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 54112eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 54122eaa055fSJeff Mahoney spin_unlock(&root->fs_info->super_lock); 54132eaa055fSJeff Mahoney 5414d0270acaSJeff Mahoney return btrfs_commit_transaction(trans, root); 54152eaa055fSJeff Mahoney } 54162eaa055fSJeff Mahoney 5417f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5418f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5419f46b5a66SChristoph Hellwig { 5420496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 54214bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5422f46b5a66SChristoph Hellwig 5423f46b5a66SChristoph Hellwig switch (cmd) { 54246cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 54256cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 54266cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 54276cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 54286cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 54296cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5430f7039b1dSLi Dongyang case FITRIM: 5431f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5432f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5433fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5434fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5435fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54363de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5437fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54386f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54396f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 544076dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 544176dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 54420caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54430caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 54440caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54450caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54466ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54476ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5448f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54491e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54501e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54511e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5452f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5453198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5454f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54554bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 5456f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5457da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 5458475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 5459475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 5460475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 5461475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 5462f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 54639ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5464f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 5465f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 5466f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 5467f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 5468ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5469ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5470cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5471cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5472ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5473ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5474d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5475d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5476d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5477d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 54781406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54791406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 54809b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54819b199859SFilipe David Borba Manana int ret; 54829b199859SFilipe David Borba Manana 54836c255e67SMiao Xie ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); 54849b199859SFilipe David Borba Manana if (ret) 54859b199859SFilipe David Borba Manana return ret; 5486ddb52f4fSAl Viro ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); 54872fad4e83SDavid Sterba /* 54882fad4e83SDavid Sterba * The transaction thread may want to do more work, 54892fad4e83SDavid Sterba * namely it pokes the cleaner ktread that will start 54902fad4e83SDavid Sterba * processing uncleaned subvols. 54912fad4e83SDavid Sterba */ 54922fad4e83SDavid Sterba wake_up_process(root->fs_info->transaction_kthread); 54939b199859SFilipe David Borba Manana return ret; 54949b199859SFilipe David Borba Manana } 549546204592SSage Weil case BTRFS_IOC_START_SYNC: 54969a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 549746204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 54989a8c28beSMiao Xie return btrfs_ioctl_wait_sync(root, argp); 5499475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5500b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5501475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 5502475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 5503475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 5504475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 5505c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 55069ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5507837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 5508837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 550919a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 551019a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 55118ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55128ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5513abccd00fSHugo Mills #ifdef CONFIG_64BIT 5514abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5515abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5516abccd00fSHugo Mills #endif 551731db9f7cSAlexander Block case BTRFS_IOC_SEND: 551831db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 5519c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 5520b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 55215d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5522905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55235d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5524905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55255d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5526905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55275d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5528905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55292f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55302f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55312f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 55322f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 553357254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 553457254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 55353f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55363f6bcfbdSStefan Behrens return btrfs_ioctl_dev_replace(root, argp); 5537867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5538867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5539a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5540a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 55412eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5542d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 55432eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 55442eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 55452eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55462eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5547f46b5a66SChristoph Hellwig } 5548f46b5a66SChristoph Hellwig 5549f46b5a66SChristoph Hellwig return -ENOTTY; 5550f46b5a66SChristoph Hellwig } 5551