1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 2f46b5a66SChristoph Hellwig /* 3f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 4f46b5a66SChristoph Hellwig */ 5f46b5a66SChristoph Hellwig 6f46b5a66SChristoph Hellwig #include <linux/kernel.h> 7f46b5a66SChristoph Hellwig #include <linux/bio.h> 8f46b5a66SChristoph Hellwig #include <linux/file.h> 9f46b5a66SChristoph Hellwig #include <linux/fs.h> 10cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 11f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 12f46b5a66SChristoph Hellwig #include <linux/highmem.h> 13f46b5a66SChristoph Hellwig #include <linux/time.h> 14f46b5a66SChristoph Hellwig #include <linux/string.h> 15f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 16cb8e7090SChristoph Hellwig #include <linux/mount.h> 17cb8e7090SChristoph Hellwig #include <linux/namei.h> 18f46b5a66SChristoph Hellwig #include <linux/writeback.h> 19f46b5a66SChristoph Hellwig #include <linux/compat.h> 20cb8e7090SChristoph Hellwig #include <linux/security.h> 21f46b5a66SChristoph Hellwig #include <linux/xattr.h> 22f54de068SDavid Sterba #include <linux/mm.h> 235a0e3ad6STejun Heo #include <linux/slab.h> 24f7039b1dSLi Dongyang #include <linux/blkdev.h> 258ea05e3aSAlexander Block #include <linux/uuid.h> 2655e301fdSFilipe Brandenburger #include <linux/btrfs.h> 27416161dbSMark Fasheh #include <linux/uaccess.h> 28ae5e165dSJeff Layton #include <linux/iversion.h> 29f46b5a66SChristoph Hellwig #include "ctree.h" 30f46b5a66SChristoph Hellwig #include "disk-io.h" 31949964c9SMarcos Paulo de Souza #include "export.h" 32f46b5a66SChristoph Hellwig #include "transaction.h" 33f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 34f46b5a66SChristoph Hellwig #include "print-tree.h" 35f46b5a66SChristoph Hellwig #include "volumes.h" 36925baeddSChris Mason #include "locking.h" 37581bb050SLi Zefan #include "inode-map.h" 38d7728c96SJan Schmidt #include "backref.h" 39606686eeSJosef Bacik #include "rcu-string.h" 4031db9f7cSAlexander Block #include "send.h" 413f6bcfbdSStefan Behrens #include "dev-replace.h" 4263541927SFilipe David Borba Manana #include "props.h" 433b02a68aSJeff Mahoney #include "sysfs.h" 44fcebe456SJosef Bacik #include "qgroup.h" 451ec9a1aeSFilipe Manana #include "tree-log.h" 46ebb8765bSAnand Jain #include "compression.h" 478719aaaeSJosef Bacik #include "space-info.h" 4886736342SJosef Bacik #include "delalloc-space.h" 49aac0023cSJosef Bacik #include "block-group.h" 50f46b5a66SChristoph Hellwig 51abccd00fSHugo Mills #ifdef CONFIG_64BIT 52abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 53abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 54abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 55abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 56abccd00fSHugo Mills */ 57abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 58abccd00fSHugo Mills __u64 sec; 59abccd00fSHugo Mills __u32 nsec; 60abccd00fSHugo Mills } __attribute__ ((__packed__)); 61abccd00fSHugo Mills 62abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 63abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 64abccd00fSHugo Mills __u64 stransid; /* in */ 65abccd00fSHugo Mills __u64 rtransid; /* out */ 66abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 67abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 68abccd00fSHugo Mills __u64 flags; /* in */ 69abccd00fSHugo Mills __u64 reserved[16]; /* in */ 70abccd00fSHugo Mills } __attribute__ ((__packed__)); 71abccd00fSHugo Mills 72abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 73abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 74abccd00fSHugo Mills #endif 75abccd00fSHugo Mills 762351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 772351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 782351f431SJosef Bacik __s64 send_fd; /* in */ 792351f431SJosef Bacik __u64 clone_sources_count; /* in */ 802351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 812351f431SJosef Bacik __u64 parent_root; /* in */ 822351f431SJosef Bacik __u64 flags; /* in */ 832351f431SJosef Bacik __u64 reserved[4]; /* in */ 842351f431SJosef Bacik } __attribute__ ((__packed__)); 852351f431SJosef Bacik 862351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 872351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 882351f431SJosef Bacik #endif 89abccd00fSHugo Mills 906cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 911905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 921905a0f7SDavid Sterba unsigned int flags) 936cbff00fSChristoph Hellwig { 941905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 956cbff00fSChristoph Hellwig return flags; 961905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 103a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 104a157d4fdSDavid Sterba * ioctl. 1056cbff00fSChristoph Hellwig */ 106a157d4fdSDavid Sterba static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 12513f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 126d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 12713f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 12813f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1367b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1385c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1415c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1435c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1455c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1475c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1495c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 1595c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 1605c57b8b6SDavid Sterba unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 1675ba76abfSDavid Sterba /* Check if @flags are a supported and valid set of FS_*_FL flags */ 1685ba76abfSDavid Sterba static int check_fsflags(unsigned int flags) 16975e7cb7fSLiu Bo { 17075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 173e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 174e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17575e7cb7fSLiu Bo return -EOPNOTSUPP; 17675e7cb7fSLiu Bo 17775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17875e7cb7fSLiu Bo return -EINVAL; 17975e7cb7fSLiu Bo 18075e7cb7fSLiu Bo return 0; 18175e7cb7fSLiu Bo } 18275e7cb7fSLiu Bo 1836cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1846cbff00fSChristoph Hellwig { 185496ad9aaSAl Viro struct inode *inode = file_inode(file); 1860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1875c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1885c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 1896cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1905aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 1916cbff00fSChristoph Hellwig int ret; 192ff9fef55SAnand Jain const char *comp = NULL; 193d2b8fcfeSAnand Jain u32 binode_flags = binode->flags; 1946cbff00fSChristoph Hellwig 195bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 196bd60ea0fSDavid Sterba return -EPERM; 197bd60ea0fSDavid Sterba 198b83cc969SLi Zefan if (btrfs_root_readonly(root)) 199b83cc969SLi Zefan return -EROFS; 200b83cc969SLi Zefan 2015c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2026cbff00fSChristoph Hellwig return -EFAULT; 2036cbff00fSChristoph Hellwig 2045c57b8b6SDavid Sterba ret = check_fsflags(fsflags); 20575e7cb7fSLiu Bo if (ret) 20675e7cb7fSLiu Bo return ret; 2076cbff00fSChristoph Hellwig 208e7848683SJan Kara ret = mnt_want_write_file(file); 209e7848683SJan Kara if (ret) 210e7848683SJan Kara return ret; 211e7848683SJan Kara 2125955102cSAl Viro inode_lock(inode); 2136cbff00fSChristoph Hellwig 2145c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2155aca2842SDarrick J. Wong old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 2165aca2842SDarrick J. Wong ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags); 2175aca2842SDarrick J. Wong if (ret) 2186cbff00fSChristoph Hellwig goto out_unlock; 2196cbff00fSChristoph Hellwig 2205c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 221d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2226cbff00fSChristoph Hellwig else 223d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2245c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 225d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2266cbff00fSChristoph Hellwig else 227d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2285c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 229d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2306cbff00fSChristoph Hellwig else 231d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2325c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 233d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2346cbff00fSChristoph Hellwig else 235d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2365c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 237d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2386cbff00fSChristoph Hellwig else 239d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 2405c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 241d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2426cbff00fSChristoph Hellwig else 243d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2445c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 24544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2467e97b8daSDavid Sterba /* 2477e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2487e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2497e97b8daSDavid Sterba * status of the file and will not set it. 2507e97b8daSDavid Sterba */ 2517e97b8daSDavid Sterba if (inode->i_size == 0) 252d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 253d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2547e97b8daSDavid Sterba } else { 255d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2567e97b8daSDavid Sterba } 2577e97b8daSDavid Sterba } else { 2587e97b8daSDavid Sterba /* 25901327610SNicholas D Steeves * Revert back under same assumptions as above 2607e97b8daSDavid Sterba */ 26144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2627e97b8daSDavid Sterba if (inode->i_size == 0) 263d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 264d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2657e97b8daSDavid Sterba } else { 266d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2677e97b8daSDavid Sterba } 2687e97b8daSDavid Sterba } 2696cbff00fSChristoph Hellwig 27075e7cb7fSLiu Bo /* 27175e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27275e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27375e7cb7fSLiu Bo * things smaller. 27475e7cb7fSLiu Bo */ 2755c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 276d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 277d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 2785c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 27963541927SFilipe David Borba Manana 280eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 281eede2bf3SOmar Sandoval ret = -ETXTBSY; 282eede2bf3SOmar Sandoval goto out_unlock; 283eede2bf3SOmar Sandoval } 284eede2bf3SOmar Sandoval 285d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 286d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 28763541927SFilipe David Borba Manana 28893370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 28993370509SDavid Sterba if (!comp || comp[0] == 0) 29093370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 291ebcb904dSLi Zefan } else { 292d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 29375e7cb7fSLiu Bo } 2946cbff00fSChristoph Hellwig 295ff9fef55SAnand Jain /* 296ff9fef55SAnand Jain * 1 for inode item 297ff9fef55SAnand Jain * 2 for properties 298ff9fef55SAnand Jain */ 299ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 300f062abf0SLi Zefan if (IS_ERR(trans)) { 301f062abf0SLi Zefan ret = PTR_ERR(trans); 302d2b8fcfeSAnand Jain goto out_unlock; 303f062abf0SLi Zefan } 3046cbff00fSChristoph Hellwig 305ff9fef55SAnand Jain if (comp) { 306ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 307ff9fef55SAnand Jain strlen(comp), 0); 308ff9fef55SAnand Jain if (ret) { 309ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 310ff9fef55SAnand Jain goto out_end_trans; 311ff9fef55SAnand Jain } 312ff9fef55SAnand Jain } else { 313ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 314ff9fef55SAnand Jain 0, 0); 315ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 316ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 317ff9fef55SAnand Jain goto out_end_trans; 318ff9fef55SAnand Jain } 319ff9fef55SAnand Jain } 320ff9fef55SAnand Jain 321d2b8fcfeSAnand Jain binode->flags = binode_flags; 3227b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3230c4d2d95SJosef Bacik inode_inc_iversion(inode); 324c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3256cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3266cbff00fSChristoph Hellwig 327ff9fef55SAnand Jain out_end_trans: 3283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3296cbff00fSChristoph Hellwig out_unlock: 3305955102cSAl Viro inode_unlock(inode); 331e7848683SJan Kara mnt_drop_write_file(file); 3322d4e6f6aSliubo return ret; 3336cbff00fSChristoph Hellwig } 3346cbff00fSChristoph Hellwig 33519f93b3cSDavid Sterba /* 33619f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 33719f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 33819f93b3cSDavid Sterba * silently dropped. 33919f93b3cSDavid Sterba */ 34019f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 34119f93b3cSDavid Sterba { 34219f93b3cSDavid Sterba unsigned int xflags = 0; 34319f93b3cSDavid Sterba 34419f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 34519f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 34619f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 34719f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 34819f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 34919f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 35019f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 35119f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 35219f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 35319f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 35419f93b3cSDavid Sterba 35519f93b3cSDavid Sterba return xflags; 35619f93b3cSDavid Sterba } 35719f93b3cSDavid Sterba 35819f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 35919f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 36019f93b3cSDavid Sterba { 36119f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 36219f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 36319f93b3cSDavid Sterba return -EOPNOTSUPP; 36419f93b3cSDavid Sterba return 0; 36519f93b3cSDavid Sterba } 36619f93b3cSDavid Sterba 367e4202ac9SDavid Sterba /* 368e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 369e4202ac9SDavid Sterba * are zeroed. 370e4202ac9SDavid Sterba */ 371e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 372e4202ac9SDavid Sterba { 373e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 374e4202ac9SDavid Sterba struct fsxattr fa; 375e4202ac9SDavid Sterba 3767b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 377e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 378e4202ac9SDavid Sterba return -EFAULT; 379e4202ac9SDavid Sterba 380e4202ac9SDavid Sterba return 0; 381e4202ac9SDavid Sterba } 382e4202ac9SDavid Sterba 383025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 384025f2121SDavid Sterba { 385025f2121SDavid Sterba struct inode *inode = file_inode(file); 386025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 387025f2121SDavid Sterba struct btrfs_root *root = binode->root; 388025f2121SDavid Sterba struct btrfs_trans_handle *trans; 3897b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 390025f2121SDavid Sterba unsigned old_flags; 391025f2121SDavid Sterba unsigned old_i_flags; 392025f2121SDavid Sterba int ret = 0; 393025f2121SDavid Sterba 394025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 395025f2121SDavid Sterba return -EPERM; 396025f2121SDavid Sterba 397025f2121SDavid Sterba if (btrfs_root_readonly(root)) 398025f2121SDavid Sterba return -EROFS; 399025f2121SDavid Sterba 400025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 401025f2121SDavid Sterba return -EFAULT; 402025f2121SDavid Sterba 403025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 404025f2121SDavid Sterba if (ret) 405025f2121SDavid Sterba return ret; 406025f2121SDavid Sterba 407025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 408025f2121SDavid Sterba return -EOPNOTSUPP; 409025f2121SDavid Sterba 410025f2121SDavid Sterba ret = mnt_want_write_file(file); 411025f2121SDavid Sterba if (ret) 412025f2121SDavid Sterba return ret; 413025f2121SDavid Sterba 414025f2121SDavid Sterba inode_lock(inode); 415025f2121SDavid Sterba 416025f2121SDavid Sterba old_flags = binode->flags; 417025f2121SDavid Sterba old_i_flags = inode->i_flags; 418025f2121SDavid Sterba 4197b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4207b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4217b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4227b0e492eSDarrick J. Wong if (ret) 423025f2121SDavid Sterba goto out_unlock; 424025f2121SDavid Sterba 425025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 426025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 427025f2121SDavid Sterba else 428025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 429025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 430025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 431025f2121SDavid Sterba else 432025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 433025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 434025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 435025f2121SDavid Sterba else 436025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 437025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 438025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 439025f2121SDavid Sterba else 440025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 441025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 442025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 443025f2121SDavid Sterba else 444025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 445025f2121SDavid Sterba 446025f2121SDavid Sterba /* 1 item for the inode */ 447025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 448025f2121SDavid Sterba if (IS_ERR(trans)) { 449025f2121SDavid Sterba ret = PTR_ERR(trans); 450025f2121SDavid Sterba goto out_unlock; 451025f2121SDavid Sterba } 452025f2121SDavid Sterba 453025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 454025f2121SDavid Sterba inode_inc_iversion(inode); 455025f2121SDavid Sterba inode->i_ctime = current_time(inode); 456025f2121SDavid Sterba ret = btrfs_update_inode(trans, root, inode); 457025f2121SDavid Sterba 458025f2121SDavid Sterba btrfs_end_transaction(trans); 459025f2121SDavid Sterba 460025f2121SDavid Sterba out_unlock: 461025f2121SDavid Sterba if (ret) { 462025f2121SDavid Sterba binode->flags = old_flags; 463025f2121SDavid Sterba inode->i_flags = old_i_flags; 464025f2121SDavid Sterba } 465025f2121SDavid Sterba 466025f2121SDavid Sterba inode_unlock(inode); 467025f2121SDavid Sterba mnt_drop_write_file(file); 468025f2121SDavid Sterba 469025f2121SDavid Sterba return ret; 470025f2121SDavid Sterba } 471025f2121SDavid Sterba 4726cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4736cbff00fSChristoph Hellwig { 474496ad9aaSAl Viro struct inode *inode = file_inode(file); 4756cbff00fSChristoph Hellwig 4766cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4776cbff00fSChristoph Hellwig } 478f46b5a66SChristoph Hellwig 479b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 480b929c1d8SMarcos Paulo de Souza void __user *arg) 481f7039b1dSLi Dongyang { 482f7039b1dSLi Dongyang struct btrfs_device *device; 483f7039b1dSLi Dongyang struct request_queue *q; 484f7039b1dSLi Dongyang struct fstrim_range range; 485f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 486f7039b1dSLi Dongyang u64 num_devices = 0; 487f7039b1dSLi Dongyang int ret; 488f7039b1dSLi Dongyang 489f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 490f7039b1dSLi Dongyang return -EPERM; 491f7039b1dSLi Dongyang 492f35f06c3SFilipe Manana /* 493f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 494f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 495f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 496f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 497f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 498f35f06c3SFilipe Manana */ 499f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 500f35f06c3SFilipe Manana return -EROFS; 501f35f06c3SFilipe Manana 5021f78160cSXiao Guangrong rcu_read_lock(); 5031f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5041f78160cSXiao Guangrong dev_list) { 505f7039b1dSLi Dongyang if (!device->bdev) 506f7039b1dSLi Dongyang continue; 507f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 508f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 509f7039b1dSLi Dongyang num_devices++; 51050d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 511f7039b1dSLi Dongyang minlen); 512f7039b1dSLi Dongyang } 513f7039b1dSLi Dongyang } 5141f78160cSXiao Guangrong rcu_read_unlock(); 515f4c697e6SLukas Czerner 516f7039b1dSLi Dongyang if (!num_devices) 517f7039b1dSLi Dongyang return -EOPNOTSUPP; 518f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 519f7039b1dSLi Dongyang return -EFAULT; 5206ba9fc8eSQu Wenruo 5216ba9fc8eSQu Wenruo /* 5226ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5236ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5246ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5256ba9fc8eSQu Wenruo */ 5266ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 527f4c697e6SLukas Czerner return -EINVAL; 528f7039b1dSLi Dongyang 529f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5302ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 531f7039b1dSLi Dongyang if (ret < 0) 532f7039b1dSLi Dongyang return ret; 533f7039b1dSLi Dongyang 534f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 535f7039b1dSLi Dongyang return -EFAULT; 536f7039b1dSLi Dongyang 537f7039b1dSLi Dongyang return 0; 538f7039b1dSLi Dongyang } 539f7039b1dSLi Dongyang 540e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 541dd5f9615SStefan Behrens { 54246e0f66aSChris Mason int i; 54346e0f66aSChris Mason 54446e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54546e0f66aSChris Mason if (uuid[i]) 54646e0f66aSChris Mason return 0; 54746e0f66aSChris Mason } 54846e0f66aSChris Mason return 1; 549dd5f9615SStefan Behrens } 550dd5f9615SStefan Behrens 551d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 552cb8e7090SChristoph Hellwig struct dentry *dentry, 55352f75f4fSDavid Sterba const char *name, int namelen, 5548696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 555f46b5a66SChristoph Hellwig { 5560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 557f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 558f46b5a66SChristoph Hellwig struct btrfs_key key; 55949a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 560f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 561f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 562d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 56376dda93cSYan, Zheng struct btrfs_root *new_root; 564d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 56595582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5665662344bSTsutomu Itoh struct inode *inode; 567f46b5a66SChristoph Hellwig int ret; 568f46b5a66SChristoph Hellwig int err; 569f46b5a66SChristoph Hellwig u64 objectid; 570f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5713de4586cSChris Mason u64 index = 0; 572f46b5a66SChristoph Hellwig 57349a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 57449a3c4d9SDavid Sterba if (!root_item) 57549a3c4d9SDavid Sterba return -ENOMEM; 57649a3c4d9SDavid Sterba 5770b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 5782fbe8c8aSAl Viro if (ret) 57949a3c4d9SDavid Sterba goto fail_free; 5806a912213SJosef Bacik 581e09fe2d2SQu Wenruo /* 582e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 58301327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 584e09fe2d2SQu Wenruo */ 58549a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 58649a3c4d9SDavid Sterba ret = -ENOSPC; 58749a3c4d9SDavid Sterba goto fail_free; 58849a3c4d9SDavid Sterba } 589e09fe2d2SQu Wenruo 590d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5919ed74f2dSJosef Bacik /* 592d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 593d5c12070SMiao Xie * of create_snapshot(). 5949ed74f2dSJosef Bacik */ 595c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 596d5c12070SMiao Xie if (ret) 59749a3c4d9SDavid Sterba goto fail_free; 598f46b5a66SChristoph Hellwig 599d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 600d5c12070SMiao Xie if (IS_ERR(trans)) { 601d5c12070SMiao Xie ret = PTR_ERR(trans); 6027775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 60349a3c4d9SDavid Sterba goto fail_free; 604d5c12070SMiao Xie } 605d5c12070SMiao Xie trans->block_rsv = &block_rsv; 606d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 607f46b5a66SChristoph Hellwig 608a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6096f72c7e2SArne Jansen if (ret) 6106f72c7e2SArne Jansen goto fail; 6116f72c7e2SArne Jansen 6124d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 6138e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6148e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6158e8a1e31SJosef Bacik goto fail; 6168e8a1e31SJosef Bacik } 617f46b5a66SChristoph Hellwig 618f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 619f46b5a66SChristoph Hellwig 62049a3c4d9SDavid Sterba inode_item = &root_item->inode; 6213cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6223cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6233cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 624da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6250b246afaSJeff Mahoney fs_info->nodesize); 6263cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 627f46b5a66SChristoph Hellwig 62849a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 62949a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6303cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 63108fe4db1SLi Zefan 63249a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 63349a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63449a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 63549a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 63649a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 63749a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 638f46b5a66SChristoph Hellwig 63949a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 64049a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 641807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 64249a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 64349a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 64449a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 64549a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 64649a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 647f46b5a66SChristoph Hellwig 648925baeddSChris Mason btrfs_tree_unlock(leaf); 649f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 650f46b5a66SChristoph Hellwig leaf = NULL; 651f46b5a66SChristoph Hellwig 65249a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 653f46b5a66SChristoph Hellwig 654f46b5a66SChristoph Hellwig key.objectid = objectid; 6555d4f98a2SYan Zheng key.offset = 0; 656962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6570b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 65849a3c4d9SDavid Sterba root_item); 659f46b5a66SChristoph Hellwig if (ret) 660f46b5a66SChristoph Hellwig goto fail; 661f46b5a66SChristoph Hellwig 66276dda93cSYan, Zheng key.offset = (u64)-1; 6633619c94fSJosef Bacik new_root = btrfs_get_fs_root(fs_info, &key, true); 66479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 66579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 66666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 66779787eaaSJeff Mahoney goto fail; 66879787eaaSJeff Mahoney } 66976dda93cSYan, Zheng 67076dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 67176dda93cSYan, Zheng 67263541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 67300246528SJosef Bacik btrfs_put_root(new_root); 674ce598979SMark Fasheh if (ret) { 675ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 67666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 677ce598979SMark Fasheh goto fail; 678ce598979SMark Fasheh } 679ce598979SMark Fasheh 680f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 681f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 682f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 683f32e48e9SChandan Rajendra 684f46b5a66SChristoph Hellwig /* 685f46b5a66SChristoph Hellwig * insert the directory item 686f46b5a66SChristoph Hellwig */ 687877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 68879787eaaSJeff Mahoney if (ret) { 68966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 69079787eaaSJeff Mahoney goto fail; 69179787eaaSJeff Mahoney } 6923de4586cSChris Mason 693684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6943de4586cSChris Mason BTRFS_FT_DIR, index); 69579787eaaSJeff Mahoney if (ret) { 69666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 697f46b5a66SChristoph Hellwig goto fail; 69879787eaaSJeff Mahoney } 6990660b5afSChris Mason 7006ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 70152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 702c7e54b51SJosef Bacik if (ret) { 703c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 704c7e54b51SJosef Bacik goto fail; 705c7e54b51SJosef Bacik } 70652c26179SYan Zheng 7076025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7084a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 709c7e54b51SJosef Bacik if (ret) { 710c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 711c7e54b51SJosef Bacik goto fail; 712c7e54b51SJosef Bacik } 7130660b5afSChris Mason 714cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7156bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 716dd5f9615SStefan Behrens if (ret) 71766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 718dd5f9615SStefan Behrens 719f46b5a66SChristoph Hellwig fail: 72049a3c4d9SDavid Sterba kfree(root_item); 721d5c12070SMiao Xie trans->block_rsv = NULL; 722d5c12070SMiao Xie trans->bytes_reserved = 0; 7237775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 724de6e8200SLiu Bo 7253a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 726f46b5a66SChristoph Hellwig if (err && !ret) 727f46b5a66SChristoph Hellwig ret = err; 7281a65e24bSChris Mason 7295662344bSTsutomu Itoh if (!ret) { 7305662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 731de6e8200SLiu Bo if (IS_ERR(inode)) 732de6e8200SLiu Bo return PTR_ERR(inode); 7335662344bSTsutomu Itoh d_instantiate(dentry, inode); 7345662344bSTsutomu Itoh } 735f46b5a66SChristoph Hellwig return ret; 73649a3c4d9SDavid Sterba 73749a3c4d9SDavid Sterba fail_free: 73849a3c4d9SDavid Sterba kfree(root_item); 73949a3c4d9SDavid Sterba return ret; 740f46b5a66SChristoph Hellwig } 741f46b5a66SChristoph Hellwig 742e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7439babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 744e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 745f46b5a66SChristoph Hellwig { 7460b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7472e4bfab9SYan, Zheng struct inode *inode; 748f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 749f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7502e4bfab9SYan, Zheng int ret; 7518ecebf4dSRobbie Ko bool snapshot_force_cow = false; 752f46b5a66SChristoph Hellwig 75392a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 754f46b5a66SChristoph Hellwig return -EINVAL; 755f46b5a66SChristoph Hellwig 756eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 757eede2bf3SOmar Sandoval btrfs_warn(fs_info, 758eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 759eede2bf3SOmar Sandoval return -ETXTBSY; 760eede2bf3SOmar Sandoval } 761eede2bf3SOmar Sandoval 76223269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 763a1ee7362SDavid Sterba if (!pending_snapshot) 764a1ee7362SDavid Sterba return -ENOMEM; 765a1ee7362SDavid Sterba 766b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 76723269bf5SDavid Sterba GFP_KERNEL); 7688546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7698546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 770b0c0ea63SDavid Sterba ret = -ENOMEM; 771b0c0ea63SDavid Sterba goto free_pending; 772b0c0ea63SDavid Sterba } 773b0c0ea63SDavid Sterba 7748ecebf4dSRobbie Ko /* 7758ecebf4dSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 7768ecebf4dSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 7778ecebf4dSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 7788ecebf4dSRobbie Ko */ 779dcc3eb96SNikolay Borisov btrfs_drew_read_lock(&root->snapshot_lock); 7808257b2dcSMiao Xie 7813cd24c69SEthan Lien ret = btrfs_start_delalloc_snapshot(root); 7826a03843dSMiao Xie if (ret) 783a1ee7362SDavid Sterba goto dec_and_free; 7846a03843dSMiao Xie 7858ecebf4dSRobbie Ko /* 7868ecebf4dSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 7878ecebf4dSRobbie Ko * we force future writes to fallback to COW mode during snapshot 7888ecebf4dSRobbie Ko * creation. 7898ecebf4dSRobbie Ko */ 7908ecebf4dSRobbie Ko atomic_inc(&root->snapshot_force_cow); 7918ecebf4dSRobbie Ko snapshot_force_cow = true; 7928ecebf4dSRobbie Ko 7936374e57aSChris Mason btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 7946a03843dSMiao Xie 79566d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 79666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 797d5c12070SMiao Xie /* 798d5c12070SMiao Xie * 1 - parent dir inode 799d5c12070SMiao Xie * 2 - dir entries 800d5c12070SMiao Xie * 1 - root item 801d5c12070SMiao Xie * 2 - root ref/backref 802d5c12070SMiao Xie * 1 - root of snapshot 803dd5f9615SStefan Behrens * 1 - UUID item 804d5c12070SMiao Xie */ 805d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 806dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 807ee3441b4SJeff Mahoney false); 808d5c12070SMiao Xie if (ret) 809a1ee7362SDavid Sterba goto dec_and_free; 810d5c12070SMiao Xie 811a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 812a22285a6SYan, Zheng pending_snapshot->root = root; 813b83cc969SLi Zefan pending_snapshot->readonly = readonly; 814e9662f70SMiao Xie pending_snapshot->dir = dir; 8158696c533SMiao Xie pending_snapshot->inherit = inherit; 816a22285a6SYan, Zheng 817d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 818a22285a6SYan, Zheng if (IS_ERR(trans)) { 819a22285a6SYan, Zheng ret = PTR_ERR(trans); 820a22285a6SYan, Zheng goto fail; 821a22285a6SYan, Zheng } 822a22285a6SYan, Zheng 8230b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 824a22285a6SYan, Zheng list_add(&pending_snapshot->list, 825a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8260b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8279babda9fSNikolay Borisov 8283a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 829aec8030aSMiao Xie if (ret) 830c37b2b62SJosef Bacik goto fail; 831a22285a6SYan, Zheng 832a22285a6SYan, Zheng ret = pending_snapshot->error; 833f46b5a66SChristoph Hellwig if (ret) 8342e4bfab9SYan, Zheng goto fail; 835f46b5a66SChristoph Hellwig 836d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 837d3797308SChris Mason if (ret) 838d3797308SChris Mason goto fail; 839d3797308SChris Mason 8402b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8412e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8422e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8432e4bfab9SYan, Zheng goto fail; 8442e4bfab9SYan, Zheng } 8455662344bSTsutomu Itoh 8462e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8472e4bfab9SYan, Zheng ret = 0; 8482e4bfab9SYan, Zheng fail: 84900246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 8507775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); 851a1ee7362SDavid Sterba dec_and_free: 8528ecebf4dSRobbie Ko if (snapshot_force_cow) 8538ecebf4dSRobbie Ko atomic_dec(&root->snapshot_force_cow); 854dcc3eb96SNikolay Borisov btrfs_drew_read_unlock(&root->snapshot_lock); 855dcc3eb96SNikolay Borisov 856b0c0ea63SDavid Sterba free_pending: 857b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8588546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 859a1ee7362SDavid Sterba kfree(pending_snapshot); 860a1ee7362SDavid Sterba 861f46b5a66SChristoph Hellwig return ret; 862f46b5a66SChristoph Hellwig } 863f46b5a66SChristoph Hellwig 8644260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8654260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8664260f7c7SSage Weil * whether the type of victim is right. 8674260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8684260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8694260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8704260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8714260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8724260f7c7SSage Weil * a. be owner of dir, or 8734260f7c7SSage Weil * b. be owner of victim, or 8744260f7c7SSage Weil * c. have CAP_FOWNER capability 87501327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8764260f7c7SSage Weil * links pointing to it. 8774260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8784260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8794260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8804260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8814260f7c7SSage Weil * nfs_async_unlink(). 8824260f7c7SSage Weil */ 8834260f7c7SSage Weil 8844260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8854260f7c7SSage Weil { 8864260f7c7SSage Weil int error; 8874260f7c7SSage Weil 8882b0143b5SDavid Howells if (d_really_is_negative(victim)) 8894260f7c7SSage Weil return -ENOENT; 8904260f7c7SSage Weil 8912b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8924fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8934260f7c7SSage Weil 8944260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 8954260f7c7SSage Weil if (error) 8964260f7c7SSage Weil return error; 8974260f7c7SSage Weil if (IS_APPEND(dir)) 8984260f7c7SSage Weil return -EPERM; 8992b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9002b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9014260f7c7SSage Weil return -EPERM; 9024260f7c7SSage Weil if (isdir) { 903e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9044260f7c7SSage Weil return -ENOTDIR; 9054260f7c7SSage Weil if (IS_ROOT(victim)) 9064260f7c7SSage Weil return -EBUSY; 907e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9084260f7c7SSage Weil return -EISDIR; 9094260f7c7SSage Weil if (IS_DEADDIR(dir)) 9104260f7c7SSage Weil return -ENOENT; 9114260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9124260f7c7SSage Weil return -EBUSY; 9134260f7c7SSage Weil return 0; 9144260f7c7SSage Weil } 9154260f7c7SSage Weil 916cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 917cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 918cb8e7090SChristoph Hellwig { 9192b0143b5SDavid Howells if (d_really_is_positive(child)) 920cb8e7090SChristoph Hellwig return -EEXIST; 921cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 922cb8e7090SChristoph Hellwig return -ENOENT; 923cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 924cb8e7090SChristoph Hellwig } 925cb8e7090SChristoph Hellwig 926cb8e7090SChristoph Hellwig /* 927cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 928cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 929cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 930cb8e7090SChristoph Hellwig */ 93192872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 93252f75f4fSDavid Sterba const char *name, int namelen, 93372fd032eSSage Weil struct btrfs_root *snap_src, 9349babda9fSNikolay Borisov bool readonly, 9358696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 936cb8e7090SChristoph Hellwig { 9372b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9380b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 939cb8e7090SChristoph Hellwig struct dentry *dentry; 940cb8e7090SChristoph Hellwig int error; 941cb8e7090SChristoph Hellwig 94200235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 94300235411SAl Viro if (error == -EINTR) 94400235411SAl Viro return error; 945cb8e7090SChristoph Hellwig 946cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 947cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 948cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 949cb8e7090SChristoph Hellwig goto out_unlock; 950cb8e7090SChristoph Hellwig 95176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 952cb8e7090SChristoph Hellwig if (error) 953a874a63eSLiu Bo goto out_dput; 954cb8e7090SChristoph Hellwig 9559c52057cSChris Mason /* 9569c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9579c52057cSChris Mason * check for them now when we can safely fail 9589c52057cSChris Mason */ 9599c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9609c52057cSChris Mason dir->i_ino, name, 9619c52057cSChris Mason namelen); 9629c52057cSChris Mason if (error) 9639c52057cSChris Mason goto out_dput; 9649c52057cSChris Mason 9650b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 96676dda93cSYan, Zheng 96776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 96876dda93cSYan, Zheng goto out_up_read; 96976dda93cSYan, Zheng 9709babda9fSNikolay Borisov if (snap_src) 9719babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9729babda9fSNikolay Borisov else 9739babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9749babda9fSNikolay Borisov 97576dda93cSYan, Zheng if (!error) 97676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 97776dda93cSYan, Zheng out_up_read: 9780b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 979cb8e7090SChristoph Hellwig out_dput: 980cb8e7090SChristoph Hellwig dput(dentry); 981cb8e7090SChristoph Hellwig out_unlock: 9825955102cSAl Viro inode_unlock(dir); 983cb8e7090SChristoph Hellwig return error; 984cb8e7090SChristoph Hellwig } 985cb8e7090SChristoph Hellwig 9864cb5300bSChris Mason /* 9874cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9884cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9894cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9904cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9914cb5300bSChris Mason * part of the file 9924cb5300bSChris Mason */ 993aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9944cb5300bSChris Mason { 9954cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9964cb5300bSChris Mason struct extent_map *em = NULL; 9974cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 9984cb5300bSChris Mason u64 end; 9994cb5300bSChris Mason 10004cb5300bSChris Mason read_lock(&em_tree->lock); 100109cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10024cb5300bSChris Mason read_unlock(&em_tree->lock); 10034cb5300bSChris Mason 10044cb5300bSChris Mason if (em) { 10054cb5300bSChris Mason end = extent_map_end(em); 10064cb5300bSChris Mason free_extent_map(em); 10074cb5300bSChris Mason if (end - offset > thresh) 10084cb5300bSChris Mason return 0; 10094cb5300bSChris Mason } 10104cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10114cb5300bSChris Mason thresh /= 2; 10124cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10134cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10144cb5300bSChris Mason if (end >= thresh) 10154cb5300bSChris Mason return 0; 10164cb5300bSChris Mason return 1; 10174cb5300bSChris Mason } 10184cb5300bSChris Mason 10194cb5300bSChris Mason /* 10204cb5300bSChris Mason * helper function to walk through a file and find extents 10214cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10224cb5300bSChris Mason * 10234cb5300bSChris Mason * This is used by the defragging code to find new and small 10244cb5300bSChris Mason * extents 10254cb5300bSChris Mason */ 10264cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10274cb5300bSChris Mason struct inode *inode, u64 newer_than, 1028aab110abSDavid Sterba u64 *off, u32 thresh) 10294cb5300bSChris Mason { 10304cb5300bSChris Mason struct btrfs_path *path; 10314cb5300bSChris Mason struct btrfs_key min_key; 10324cb5300bSChris Mason struct extent_buffer *leaf; 10334cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10344cb5300bSChris Mason int type; 10354cb5300bSChris Mason int ret; 10364a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10374cb5300bSChris Mason 10384cb5300bSChris Mason path = btrfs_alloc_path(); 10394cb5300bSChris Mason if (!path) 10404cb5300bSChris Mason return -ENOMEM; 10414cb5300bSChris Mason 1042a4689d2bSDavid Sterba min_key.objectid = ino; 10434cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10444cb5300bSChris Mason min_key.offset = *off; 10454cb5300bSChris Mason 10464cb5300bSChris Mason while (1) { 10476174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10484cb5300bSChris Mason if (ret != 0) 10494cb5300bSChris Mason goto none; 1050f094c9bdSFilipe Manana process_slot: 1051a4689d2bSDavid Sterba if (min_key.objectid != ino) 10524cb5300bSChris Mason goto none; 10534cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10544cb5300bSChris Mason goto none; 10554cb5300bSChris Mason 10564cb5300bSChris Mason leaf = path->nodes[0]; 10574cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10584cb5300bSChris Mason struct btrfs_file_extent_item); 10594cb5300bSChris Mason 10604cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10614cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10624cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10634cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10644cb5300bSChris Mason *off = min_key.offset; 10654cb5300bSChris Mason btrfs_free_path(path); 10664cb5300bSChris Mason return 0; 10674cb5300bSChris Mason } 10684cb5300bSChris Mason 1069f094c9bdSFilipe Manana path->slots[0]++; 1070f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1071f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1072f094c9bdSFilipe Manana goto process_slot; 1073f094c9bdSFilipe Manana } 1074f094c9bdSFilipe Manana 10754cb5300bSChris Mason if (min_key.offset == (u64)-1) 10764cb5300bSChris Mason goto none; 10774cb5300bSChris Mason 10784cb5300bSChris Mason min_key.offset++; 10794cb5300bSChris Mason btrfs_release_path(path); 10804cb5300bSChris Mason } 10814cb5300bSChris Mason none: 10824cb5300bSChris Mason btrfs_free_path(path); 10834cb5300bSChris Mason return -ENOENT; 10844cb5300bSChris Mason } 10854cb5300bSChris Mason 10866c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 108717ce6ef8SLiu Bo { 108817ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1089940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10906c282eb4SLi Zefan struct extent_map *em; 109109cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1092940100a4SChris Mason 1093940100a4SChris Mason /* 1094940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1095940100a4SChris Mason * the full extent lock 1096940100a4SChris Mason */ 1097940100a4SChris Mason read_lock(&em_tree->lock); 1098940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1099940100a4SChris Mason read_unlock(&em_tree->lock); 1100940100a4SChris Mason 1101940100a4SChris Mason if (!em) { 1102308d9800SFilipe Manana struct extent_state *cached = NULL; 1103308d9800SFilipe Manana u64 end = start + len - 1; 1104308d9800SFilipe Manana 1105940100a4SChris Mason /* get the big lock and read metadata off disk */ 1106ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 110739b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1108e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1109940100a4SChris Mason 11106cf8bfbfSDan Carpenter if (IS_ERR(em)) 11116c282eb4SLi Zefan return NULL; 1112940100a4SChris Mason } 1113940100a4SChris Mason 11146c282eb4SLi Zefan return em; 11156c282eb4SLi Zefan } 11166c282eb4SLi Zefan 11176c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11186c282eb4SLi Zefan { 11196c282eb4SLi Zefan struct extent_map *next; 11206c282eb4SLi Zefan bool ret = true; 11216c282eb4SLi Zefan 11226c282eb4SLi Zefan /* this is the last extent */ 11236c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11246c282eb4SLi Zefan return false; 11256c282eb4SLi Zefan 11266c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1127e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1128e9512d72SChris Mason ret = false; 1129e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1130ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11316c282eb4SLi Zefan ret = false; 11326c282eb4SLi Zefan 11336c282eb4SLi Zefan free_extent_map(next); 11346c282eb4SLi Zefan return ret; 11356c282eb4SLi Zefan } 11366c282eb4SLi Zefan 1137aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1138a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1139a43a2111SAndrew Mahone int compress) 11406c282eb4SLi Zefan { 11416c282eb4SLi Zefan struct extent_map *em; 11426c282eb4SLi Zefan int ret = 1; 11436c282eb4SLi Zefan bool next_mergeable = true; 11444a3560c4SLiu Bo bool prev_mergeable = true; 11456c282eb4SLi Zefan 11466c282eb4SLi Zefan /* 11476c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11486c282eb4SLi Zefan * defragging it 11496c282eb4SLi Zefan */ 11506c282eb4SLi Zefan if (start < *defrag_end) 11516c282eb4SLi Zefan return 1; 11526c282eb4SLi Zefan 11536c282eb4SLi Zefan *skip = 0; 11546c282eb4SLi Zefan 11556c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11566c282eb4SLi Zefan if (!em) 11576c282eb4SLi Zefan return 0; 11586c282eb4SLi Zefan 1159940100a4SChris Mason /* this will cover holes, and inline extents */ 116017ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1161940100a4SChris Mason ret = 0; 116217ce6ef8SLiu Bo goto out; 116317ce6ef8SLiu Bo } 116417ce6ef8SLiu Bo 11654a3560c4SLiu Bo if (!*defrag_end) 11664a3560c4SLiu Bo prev_mergeable = false; 11674a3560c4SLiu Bo 11686c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1169940100a4SChris Mason /* 11706c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11716c282eb4SLi Zefan * real extent, don't bother defragging it 1172940100a4SChris Mason */ 1173a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11744a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1175940100a4SChris Mason ret = 0; 117617ce6ef8SLiu Bo out: 1177940100a4SChris Mason /* 1178940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1179940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1180940100a4SChris Mason * so that the next tiny extent will force a defrag. 1181940100a4SChris Mason * 1182940100a4SChris Mason * The end result of this is that tiny extents before a single big 1183940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1184940100a4SChris Mason */ 1185940100a4SChris Mason if (ret) { 1186940100a4SChris Mason *defrag_end = extent_map_end(em); 1187940100a4SChris Mason } else { 1188940100a4SChris Mason *last_len = 0; 1189940100a4SChris Mason *skip = extent_map_end(em); 1190940100a4SChris Mason *defrag_end = 0; 1191940100a4SChris Mason } 1192940100a4SChris Mason 1193940100a4SChris Mason free_extent_map(em); 1194940100a4SChris Mason return ret; 1195940100a4SChris Mason } 1196940100a4SChris Mason 11974cb5300bSChris Mason /* 11984cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 11994cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12004cb5300bSChris Mason * to COW and defrag. 12014cb5300bSChris Mason * 12024cb5300bSChris Mason * It also makes sure the delalloc code has enough 12034cb5300bSChris Mason * dirty data to avoid making new small extents as part 12044cb5300bSChris Mason * of the defrag 12054cb5300bSChris Mason * 12064cb5300bSChris Mason * It's a good idea to start RA on this range 12074cb5300bSChris Mason * before calling this. 12084cb5300bSChris Mason */ 12094cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12104cb5300bSChris Mason struct page **pages, 12114cb5300bSChris Mason unsigned long start_index, 1212c41570c9SJustin Maggard unsigned long num_pages) 1213f46b5a66SChristoph Hellwig { 12144cb5300bSChris Mason unsigned long file_end; 12154cb5300bSChris Mason u64 isize = i_size_read(inode); 1216f46b5a66SChristoph Hellwig u64 page_start; 1217f46b5a66SChristoph Hellwig u64 page_end; 12181f12bd06SLiu Bo u64 page_cnt; 12194cb5300bSChris Mason int ret; 12204cb5300bSChris Mason int i; 12214cb5300bSChris Mason int i_done; 12224cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12234cb5300bSChris Mason struct extent_state *cached_state = NULL; 1224600a45e1SMiao Xie struct extent_io_tree *tree; 1225364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12263b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12274cb5300bSChris Mason 122809cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12291f12bd06SLiu Bo if (!isize || start_index > file_end) 12301f12bd06SLiu Bo return 0; 12311f12bd06SLiu Bo 12321f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12334cb5300bSChris Mason 1234364ecf36SQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, 123509cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 123609cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12374cb5300bSChris Mason if (ret) 12384cb5300bSChris Mason return ret; 12394cb5300bSChris Mason i_done = 0; 1240600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12414cb5300bSChris Mason 12424cb5300bSChris Mason /* step one, lock all the pages */ 12431f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12444cb5300bSChris Mason struct page *page; 1245600a45e1SMiao Xie again: 1246a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12473b16a4e3SJosef Bacik start_index + i, mask); 12484cb5300bSChris Mason if (!page) 12494cb5300bSChris Mason break; 12504cb5300bSChris Mason 1251600a45e1SMiao Xie page_start = page_offset(page); 125209cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1253600a45e1SMiao Xie while (1) { 1254308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1255ff13db41SDavid Sterba &cached_state); 1256600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1257600a45e1SMiao Xie page_start); 1258308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1259e43bbe5eSDavid Sterba &cached_state); 1260600a45e1SMiao Xie if (!ordered) 1261600a45e1SMiao Xie break; 1262600a45e1SMiao Xie 1263600a45e1SMiao Xie unlock_page(page); 1264600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1265600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1266600a45e1SMiao Xie lock_page(page); 12671f12bd06SLiu Bo /* 12681f12bd06SLiu Bo * we unlocked the page above, so we need check if 12691f12bd06SLiu Bo * it was released or not. 12701f12bd06SLiu Bo */ 12711f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12721f12bd06SLiu Bo unlock_page(page); 127309cbfeafSKirill A. Shutemov put_page(page); 12741f12bd06SLiu Bo goto again; 12751f12bd06SLiu Bo } 1276600a45e1SMiao Xie } 1277600a45e1SMiao Xie 12784cb5300bSChris Mason if (!PageUptodate(page)) { 12794cb5300bSChris Mason btrfs_readpage(NULL, page); 12804cb5300bSChris Mason lock_page(page); 12814cb5300bSChris Mason if (!PageUptodate(page)) { 12824cb5300bSChris Mason unlock_page(page); 128309cbfeafSKirill A. Shutemov put_page(page); 12844cb5300bSChris Mason ret = -EIO; 12854cb5300bSChris Mason break; 12864cb5300bSChris Mason } 12874cb5300bSChris Mason } 1288600a45e1SMiao Xie 1289600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1290600a45e1SMiao Xie unlock_page(page); 129109cbfeafSKirill A. Shutemov put_page(page); 1292600a45e1SMiao Xie goto again; 1293600a45e1SMiao Xie } 1294600a45e1SMiao Xie 12954cb5300bSChris Mason pages[i] = page; 12964cb5300bSChris Mason i_done++; 12974cb5300bSChris Mason } 12984cb5300bSChris Mason if (!i_done || ret) 12994cb5300bSChris Mason goto out; 13004cb5300bSChris Mason 13011751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13024cb5300bSChris Mason goto out; 13034cb5300bSChris Mason 13044cb5300bSChris Mason /* 13054cb5300bSChris Mason * so now we have a nice long stream of locked 13064cb5300bSChris Mason * and up to date pages, lets wait on them 13074cb5300bSChris Mason */ 13084cb5300bSChris Mason for (i = 0; i < i_done; i++) 13094cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13104cb5300bSChris Mason 13114cb5300bSChris Mason page_start = page_offset(pages[0]); 131209cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13134cb5300bSChris Mason 13144cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1315ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13164cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1317e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1318e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13194cb5300bSChris Mason 13201f12bd06SLiu Bo if (i_done != page_cnt) { 13219e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 132228c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13239e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 1324bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 132509cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 132643b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13274cb5300bSChris Mason } 13284cb5300bSChris Mason 13294cb5300bSChris Mason 13309e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1331018ed4f7SDavid Sterba &cached_state); 13324cb5300bSChris Mason 13334cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1334e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13354cb5300bSChris Mason 13364cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13374cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13384cb5300bSChris Mason ClearPageChecked(pages[i]); 13394cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13404cb5300bSChris Mason set_page_dirty(pages[i]); 13414cb5300bSChris Mason unlock_page(pages[i]); 134209cbfeafSKirill A. Shutemov put_page(pages[i]); 13434cb5300bSChris Mason } 13448702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1345364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13464cb5300bSChris Mason return i_done; 13474cb5300bSChris Mason out: 13484cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13494cb5300bSChris Mason unlock_page(pages[i]); 135009cbfeafSKirill A. Shutemov put_page(pages[i]); 13514cb5300bSChris Mason } 1352bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 135309cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 135443b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 13558702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1356364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13574cb5300bSChris Mason return ret; 13584cb5300bSChris Mason 13594cb5300bSChris Mason } 13604cb5300bSChris Mason 13614cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13624cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13634cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13644cb5300bSChris Mason { 13650b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13664cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13674cb5300bSChris Mason struct file_ra_state *ra = NULL; 13684cb5300bSChris Mason unsigned long last_index; 1369151a31b2SLi Zefan u64 isize = i_size_read(inode); 1370940100a4SChris Mason u64 last_len = 0; 1371940100a4SChris Mason u64 skip = 0; 1372940100a4SChris Mason u64 defrag_end = 0; 13734cb5300bSChris Mason u64 newer_off = range->start; 1374f46b5a66SChristoph Hellwig unsigned long i; 1375008873eaSLi Zefan unsigned long ra_index = 0; 1376f46b5a66SChristoph Hellwig int ret; 13774cb5300bSChris Mason int defrag_count = 0; 13781a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1379aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 138009cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1381c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1382ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 13834cb5300bSChris Mason struct page **pages = NULL; 13841e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 13854cb5300bSChris Mason 13860abd5b17SLiu Bo if (isize == 0) 13870abd5b17SLiu Bo return 0; 13880abd5b17SLiu Bo 13890abd5b17SLiu Bo if (range->start >= isize) 13900abd5b17SLiu Bo return -EINVAL; 13911a419d85SLi Zefan 13921e2ef46dSDavid Sterba if (do_compress) { 1393ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 13941a419d85SLi Zefan return -EINVAL; 13951a419d85SLi Zefan if (range->compress_type) 13961a419d85SLi Zefan compress_type = range->compress_type; 13971a419d85SLi Zefan } 1398f46b5a66SChristoph Hellwig 13990abd5b17SLiu Bo if (extent_thresh == 0) 1400ee22184bSByongho Lee extent_thresh = SZ_256K; 1401f46b5a66SChristoph Hellwig 14024cb5300bSChris Mason /* 14030a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14040a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14050a52d108SDavid Sterba * we don't error out. 14064cb5300bSChris Mason */ 14074cb5300bSChris Mason if (!file) { 140863e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14090a52d108SDavid Sterba if (ra) 14104cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14114cb5300bSChris Mason } else { 14124cb5300bSChris Mason ra = &file->f_ra; 14134cb5300bSChris Mason } 14144cb5300bSChris Mason 141563e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14164cb5300bSChris Mason if (!pages) { 14174cb5300bSChris Mason ret = -ENOMEM; 14184cb5300bSChris Mason goto out_ra; 14194cb5300bSChris Mason } 14204cb5300bSChris Mason 14214cb5300bSChris Mason /* find the last page to defrag */ 14221e701a32SChris Mason if (range->start + range->len > range->start) { 1423151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 142409cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14251e701a32SChris Mason } else { 142609cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14271e701a32SChris Mason } 14281e701a32SChris Mason 14294cb5300bSChris Mason if (newer_than) { 14304cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1431ee22184bSByongho Lee &newer_off, SZ_64K); 14324cb5300bSChris Mason if (!ret) { 14334cb5300bSChris Mason range->start = newer_off; 14344cb5300bSChris Mason /* 14354cb5300bSChris Mason * we always align our defrag to help keep 14364cb5300bSChris Mason * the extents in the file evenly spaced 14374cb5300bSChris Mason */ 143809cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14394cb5300bSChris Mason } else 14404cb5300bSChris Mason goto out_ra; 14414cb5300bSChris Mason } else { 144209cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14434cb5300bSChris Mason } 14444cb5300bSChris Mason if (!max_to_defrag) 1445070034bdSchandan max_to_defrag = last_index - i + 1; 14464cb5300bSChris Mason 14472a0f7f57SLi Zefan /* 14482a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14492a0f7f57SLi Zefan * written sequentially. 14502a0f7f57SLi Zefan */ 14512a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14522a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14532a0f7f57SLi Zefan 1454f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 145509cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14564cb5300bSChris Mason /* 14574cb5300bSChris Mason * make sure we stop running if someone unmounts 14584cb5300bSChris Mason * the FS 14594cb5300bSChris Mason */ 14601751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14614cb5300bSChris Mason break; 14624cb5300bSChris Mason 14630b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14640b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1465210549ebSDavid Sterba ret = -EAGAIN; 1466210549ebSDavid Sterba break; 1467210549ebSDavid Sterba } 1468210549ebSDavid Sterba 146909cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 14706c282eb4SLi Zefan extent_thresh, &last_len, &skip, 14711e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1472940100a4SChris Mason unsigned long next; 1473940100a4SChris Mason /* 1474940100a4SChris Mason * the should_defrag function tells us how much to skip 1475940100a4SChris Mason * bump our counter by the suggested amount 1476940100a4SChris Mason */ 147709cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1478940100a4SChris Mason i = max(i + 1, next); 1479940100a4SChris Mason continue; 1480940100a4SChris Mason } 1481008873eaSLi Zefan 1482008873eaSLi Zefan if (!newer_than) { 148309cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 148409cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1485008873eaSLi Zefan cluster = min(cluster, max_cluster); 1486008873eaSLi Zefan } else { 1487008873eaSLi Zefan cluster = max_cluster; 1488008873eaSLi Zefan } 1489008873eaSLi Zefan 1490008873eaSLi Zefan if (i + cluster > ra_index) { 1491008873eaSLi Zefan ra_index = max(i, ra_index); 14920a52d108SDavid Sterba if (ra) 1493d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1494d3c0bab5SDavid Sterba file, ra_index, cluster); 1495e4826a5bSchandan ra_index += cluster; 1496008873eaSLi Zefan } 14974cb5300bSChris Mason 14985955102cSAl Viro inode_lock(inode); 1499eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1500eede2bf3SOmar Sandoval ret = -ETXTBSY; 1501eede2bf3SOmar Sandoval } else { 15021e2ef46dSDavid Sterba if (do_compress) 1503eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1504008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1505eede2bf3SOmar Sandoval } 1506ecb8bea8SLiu Bo if (ret < 0) { 15075955102cSAl Viro inode_unlock(inode); 15084cb5300bSChris Mason goto out_ra; 1509ecb8bea8SLiu Bo } 15104cb5300bSChris Mason 15114cb5300bSChris Mason defrag_count += ret; 1512d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15135955102cSAl Viro inode_unlock(inode); 15144cb5300bSChris Mason 15154cb5300bSChris Mason if (newer_than) { 15164cb5300bSChris Mason if (newer_off == (u64)-1) 15174cb5300bSChris Mason break; 15184cb5300bSChris Mason 1519e1f041e1SLiu Bo if (ret > 0) 1520e1f041e1SLiu Bo i += ret; 1521e1f041e1SLiu Bo 15224cb5300bSChris Mason newer_off = max(newer_off + 1, 152309cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15244cb5300bSChris Mason 1525ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1526ee22184bSByongho Lee &newer_off, SZ_64K); 15274cb5300bSChris Mason if (!ret) { 15284cb5300bSChris Mason range->start = newer_off; 152909cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15304cb5300bSChris Mason } else { 15314cb5300bSChris Mason break; 1532940100a4SChris Mason } 15334cb5300bSChris Mason } else { 1534008873eaSLi Zefan if (ret > 0) { 1535cbcc8326SLi Zefan i += ret; 153609cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1537008873eaSLi Zefan } else { 1538940100a4SChris Mason i++; 1539008873eaSLi Zefan last_len = 0; 1540008873eaSLi Zefan } 1541f46b5a66SChristoph Hellwig } 15424cb5300bSChris Mason } 1543f46b5a66SChristoph Hellwig 1544dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15451e701a32SChris Mason filemap_flush(inode->i_mapping); 1546dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1547dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1548dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1549dec8ef90SFilipe Manana } 15501e701a32SChris Mason 15511a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15520b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15535c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15545c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15551a419d85SLi Zefan } 15561a419d85SLi Zefan 155760ccf82fSDiego Calleja ret = defrag_count; 1558940100a4SChris Mason 15594cb5300bSChris Mason out_ra: 15601e2ef46dSDavid Sterba if (do_compress) { 15615955102cSAl Viro inode_lock(inode); 1562eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 15635955102cSAl Viro inode_unlock(inode); 1564633085c7SFilipe David Borba Manana } 15654cb5300bSChris Mason if (!file) 15664cb5300bSChris Mason kfree(ra); 15674cb5300bSChris Mason kfree(pages); 1568940100a4SChris Mason return ret; 1569f46b5a66SChristoph Hellwig } 1570f46b5a66SChristoph Hellwig 1571198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 157276dda93cSYan, Zheng void __user *arg) 1573f46b5a66SChristoph Hellwig { 15740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 15750b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1576f46b5a66SChristoph Hellwig u64 new_size; 1577f46b5a66SChristoph Hellwig u64 old_size; 1578f46b5a66SChristoph Hellwig u64 devid = 1; 15790b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1580f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1581f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1582f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1583f46b5a66SChristoph Hellwig char *sizestr; 15849a40f122SGui Hecheng char *retptr; 1585f46b5a66SChristoph Hellwig char *devstr = NULL; 1586f46b5a66SChristoph Hellwig int ret = 0; 1587f46b5a66SChristoph Hellwig int mod = 0; 1588f46b5a66SChristoph Hellwig 1589e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1590e441d54dSChris Mason return -EPERM; 1591e441d54dSChris Mason 1592198605a8SMiao Xie ret = mnt_want_write_file(file); 1593198605a8SMiao Xie if (ret) 1594198605a8SMiao Xie return ret; 1595198605a8SMiao Xie 1596171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 159797547676SMiao Xie mnt_drop_write_file(file); 1598e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1599c9e9f97bSIlya Dryomov } 1600c9e9f97bSIlya Dryomov 1601dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1602c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1603c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1604c9e9f97bSIlya Dryomov goto out; 1605c9e9f97bSIlya Dryomov } 16065516e595SMark Fasheh 16075516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1608f46b5a66SChristoph Hellwig 1609f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1610f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1611f46b5a66SChristoph Hellwig if (devstr) { 1612f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1613f46b5a66SChristoph Hellwig *devstr = '\0'; 1614f46b5a66SChristoph Hellwig devstr = vol_args->name; 161558dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 161658dfae63SZhangZhen if (ret) 161758dfae63SZhangZhen goto out_free; 1618dfd79829SMiao Xie if (!devid) { 1619dfd79829SMiao Xie ret = -EINVAL; 1620dfd79829SMiao Xie goto out_free; 1621dfd79829SMiao Xie } 16220b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1623f46b5a66SChristoph Hellwig } 1624dba60f3fSMiao Xie 162509ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1626f46b5a66SChristoph Hellwig if (!device) { 16270b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1628c1c9ff7cSGeert Uytterhoeven devid); 1629dfd79829SMiao Xie ret = -ENODEV; 1630c9e9f97bSIlya Dryomov goto out_free; 1631f46b5a66SChristoph Hellwig } 1632dba60f3fSMiao Xie 1633ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16340b246afaSJeff Mahoney btrfs_info(fs_info, 1635efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1636c1c9ff7cSGeert Uytterhoeven devid); 1637dfd79829SMiao Xie ret = -EPERM; 16384e42ae1bSLiu Bo goto out_free; 16394e42ae1bSLiu Bo } 16404e42ae1bSLiu Bo 1641f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1642f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1643f46b5a66SChristoph Hellwig else { 1644f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1645f46b5a66SChristoph Hellwig mod = -1; 1646f46b5a66SChristoph Hellwig sizestr++; 1647f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1648f46b5a66SChristoph Hellwig mod = 1; 1649f46b5a66SChristoph Hellwig sizestr++; 1650f46b5a66SChristoph Hellwig } 16519a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16529a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1653f46b5a66SChristoph Hellwig ret = -EINVAL; 1654c9e9f97bSIlya Dryomov goto out_free; 1655f46b5a66SChristoph Hellwig } 1656f46b5a66SChristoph Hellwig } 1657f46b5a66SChristoph Hellwig 1658401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1659dfd79829SMiao Xie ret = -EPERM; 166063a212abSStefan Behrens goto out_free; 166163a212abSStefan Behrens } 166263a212abSStefan Behrens 16637cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1664f46b5a66SChristoph Hellwig 1665f46b5a66SChristoph Hellwig if (mod < 0) { 1666f46b5a66SChristoph Hellwig if (new_size > old_size) { 1667f46b5a66SChristoph Hellwig ret = -EINVAL; 1668c9e9f97bSIlya Dryomov goto out_free; 1669f46b5a66SChristoph Hellwig } 1670f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1671f46b5a66SChristoph Hellwig } else if (mod > 0) { 1672eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1673902c68a4SGui Hecheng ret = -ERANGE; 1674eb8052e0SWenliang Fan goto out_free; 1675eb8052e0SWenliang Fan } 1676f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1677f46b5a66SChristoph Hellwig } 1678f46b5a66SChristoph Hellwig 1679ee22184bSByongho Lee if (new_size < SZ_256M) { 1680f46b5a66SChristoph Hellwig ret = -EINVAL; 1681c9e9f97bSIlya Dryomov goto out_free; 1682f46b5a66SChristoph Hellwig } 1683f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1684f46b5a66SChristoph Hellwig ret = -EFBIG; 1685c9e9f97bSIlya Dryomov goto out_free; 1686f46b5a66SChristoph Hellwig } 1687f46b5a66SChristoph Hellwig 168847f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1689f46b5a66SChristoph Hellwig 1690f46b5a66SChristoph Hellwig if (new_size > old_size) { 1691a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 169298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 169398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1694c9e9f97bSIlya Dryomov goto out_free; 169598d5dc13STsutomu Itoh } 1696f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 16973a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1698ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1699f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17000253f40eSjeff.liu } /* equal, nothing need to do */ 1701f46b5a66SChristoph Hellwig 1702faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1703faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1704faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1705faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1706faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1707c9e9f97bSIlya Dryomov out_free: 1708f46b5a66SChristoph Hellwig kfree(vol_args); 1709c9e9f97bSIlya Dryomov out: 1710171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 171118f39c41SIlya Dryomov mnt_drop_write_file(file); 1712f46b5a66SChristoph Hellwig return ret; 1713f46b5a66SChristoph Hellwig } 1714f46b5a66SChristoph Hellwig 17155d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 171652f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17175d54c67eSNikolay Borisov bool readonly, 17188696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1719f46b5a66SChristoph Hellwig { 1720f46b5a66SChristoph Hellwig int namelen; 17213de4586cSChris Mason int ret = 0; 1722f46b5a66SChristoph Hellwig 1723325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1724325c50e3SJeff Mahoney return -ENOTDIR; 1725325c50e3SJeff Mahoney 1726a874a63eSLiu Bo ret = mnt_want_write_file(file); 1727a874a63eSLiu Bo if (ret) 1728a874a63eSLiu Bo goto out; 1729a874a63eSLiu Bo 173072fd032eSSage Weil namelen = strlen(name); 173172fd032eSSage Weil if (strchr(name, '/')) { 1732f46b5a66SChristoph Hellwig ret = -EINVAL; 1733a874a63eSLiu Bo goto out_drop_write; 1734f46b5a66SChristoph Hellwig } 1735f46b5a66SChristoph Hellwig 173616780cabSChris Mason if (name[0] == '.' && 173716780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 173816780cabSChris Mason ret = -EEXIST; 1739a874a63eSLiu Bo goto out_drop_write; 174016780cabSChris Mason } 174116780cabSChris Mason 17423de4586cSChris Mason if (subvol) { 174372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17445d54c67eSNikolay Borisov NULL, readonly, inherit); 1745cb8e7090SChristoph Hellwig } else { 17462903ff01SAl Viro struct fd src = fdget(fd); 17473de4586cSChris Mason struct inode *src_inode; 17482903ff01SAl Viro if (!src.file) { 17493de4586cSChris Mason ret = -EINVAL; 1750a874a63eSLiu Bo goto out_drop_write; 17513de4586cSChris Mason } 17523de4586cSChris Mason 1753496ad9aaSAl Viro src_inode = file_inode(src.file); 1754496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1755c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1756efe120a0SFrank Holton "Snapshot src from another FS"); 175723ad5b17SKusanagi Kouichi ret = -EXDEV; 1758d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1759d0242061SDavid Sterba /* 1760d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1761d0242061SDavid Sterba * are limited to own subvolumes only 1762d0242061SDavid Sterba */ 1763d0242061SDavid Sterba ret = -EPERM; 1764ecd18815SAl Viro } else { 176572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 176672fd032eSSage Weil BTRFS_I(src_inode)->root, 17675d54c67eSNikolay Borisov readonly, inherit); 1768ecd18815SAl Viro } 17692903ff01SAl Viro fdput(src); 1770cb8e7090SChristoph Hellwig } 1771a874a63eSLiu Bo out_drop_write: 1772a874a63eSLiu Bo mnt_drop_write_file(file); 1773f46b5a66SChristoph Hellwig out: 177472fd032eSSage Weil return ret; 177572fd032eSSage Weil } 177672fd032eSSage Weil 177772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1778fa0d2b9bSLi Zefan void __user *arg, int subvol) 177972fd032eSSage Weil { 1780fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 178172fd032eSSage Weil int ret; 178272fd032eSSage Weil 1783325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1784325c50e3SJeff Mahoney return -ENOTDIR; 1785325c50e3SJeff Mahoney 1786fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1787fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1788fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1789fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1790fa0d2b9bSLi Zefan 17915d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 17925d54c67eSNikolay Borisov subvol, false, NULL); 1793fa0d2b9bSLi Zefan 1794fa0d2b9bSLi Zefan kfree(vol_args); 1795fa0d2b9bSLi Zefan return ret; 1796fa0d2b9bSLi Zefan } 1797fa0d2b9bSLi Zefan 1798fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1799fa0d2b9bSLi Zefan void __user *arg, int subvol) 1800fa0d2b9bSLi Zefan { 1801fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1802fa0d2b9bSLi Zefan int ret; 1803b83cc969SLi Zefan bool readonly = false; 18046f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 180572fd032eSSage Weil 1806325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1807325c50e3SJeff Mahoney return -ENOTDIR; 1808325c50e3SJeff Mahoney 1809fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1810fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1811fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1812fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1813fdfb1e4fSLi Zefan 1814673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1815b83cc969SLi Zefan ret = -EOPNOTSUPP; 1816c47ca32dSDan Carpenter goto free_args; 1817fdfb1e4fSLi Zefan } 1818fdfb1e4fSLi Zefan 1819b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1820b83cc969SLi Zefan readonly = true; 18216f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 182209cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18236f72c7e2SArne Jansen ret = -EINVAL; 1824c47ca32dSDan Carpenter goto free_args; 18256f72c7e2SArne Jansen } 18266f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18276f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18286f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1829c47ca32dSDan Carpenter goto free_args; 18306f72c7e2SArne Jansen } 18316f72c7e2SArne Jansen } 183275eaa0e2SSage Weil 18335d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18345d54c67eSNikolay Borisov subvol, readonly, inherit); 1835c47ca32dSDan Carpenter if (ret) 1836c47ca32dSDan Carpenter goto free_inherit; 1837c47ca32dSDan Carpenter free_inherit: 18386f72c7e2SArne Jansen kfree(inherit); 1839c47ca32dSDan Carpenter free_args: 1840c47ca32dSDan Carpenter kfree(vol_args); 1841f46b5a66SChristoph Hellwig return ret; 1842f46b5a66SChristoph Hellwig } 1843f46b5a66SChristoph Hellwig 18440caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18450caa102dSLi Zefan void __user *arg) 18460caa102dSLi Zefan { 1847496ad9aaSAl Viro struct inode *inode = file_inode(file); 18480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18490caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18500caa102dSLi Zefan int ret = 0; 18510caa102dSLi Zefan u64 flags = 0; 18520caa102dSLi Zefan 18534a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18540caa102dSLi Zefan return -EINVAL; 18550caa102dSLi Zefan 18560b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18570caa102dSLi Zefan if (btrfs_root_readonly(root)) 18580caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18590b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18600caa102dSLi Zefan 18610caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18620caa102dSLi Zefan ret = -EFAULT; 18630caa102dSLi Zefan 18640caa102dSLi Zefan return ret; 18650caa102dSLi Zefan } 18660caa102dSLi Zefan 18670caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 18680caa102dSLi Zefan void __user *arg) 18690caa102dSLi Zefan { 1870496ad9aaSAl Viro struct inode *inode = file_inode(file); 18710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18720caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18730caa102dSLi Zefan struct btrfs_trans_handle *trans; 18740caa102dSLi Zefan u64 root_flags; 18750caa102dSLi Zefan u64 flags; 18760caa102dSLi Zefan int ret = 0; 18770caa102dSLi Zefan 1878bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1879bd60ea0fSDavid Sterba return -EPERM; 1880bd60ea0fSDavid Sterba 1881b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1882b9ca0664SLiu Bo if (ret) 1883b9ca0664SLiu Bo goto out; 18840caa102dSLi Zefan 18854a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1886b9ca0664SLiu Bo ret = -EINVAL; 1887b9ca0664SLiu Bo goto out_drop_write; 1888b9ca0664SLiu Bo } 18890caa102dSLi Zefan 1890b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1891b9ca0664SLiu Bo ret = -EFAULT; 1892b9ca0664SLiu Bo goto out_drop_write; 1893b9ca0664SLiu Bo } 18940caa102dSLi Zefan 1895b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1896b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1897b9ca0664SLiu Bo goto out_drop_write; 1898b9ca0664SLiu Bo } 18990caa102dSLi Zefan 19000b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19010caa102dSLi Zefan 19020caa102dSLi Zefan /* nothing to do */ 19030caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1904b9ca0664SLiu Bo goto out_drop_sem; 19050caa102dSLi Zefan 19060caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19072c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19080caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19090caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19102c686537SDavid Sterba } else { 19112c686537SDavid Sterba /* 19122c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19132c686537SDavid Sterba * send 19142c686537SDavid Sterba */ 19152c686537SDavid Sterba spin_lock(&root->root_item_lock); 19162c686537SDavid Sterba if (root->send_in_progress == 0) { 19170caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19180caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19192c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19202c686537SDavid Sterba } else { 19212c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19220b246afaSJeff Mahoney btrfs_warn(fs_info, 19232c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19242c686537SDavid Sterba root->root_key.objectid); 19252c686537SDavid Sterba ret = -EPERM; 19262c686537SDavid Sterba goto out_drop_sem; 19272c686537SDavid Sterba } 19282c686537SDavid Sterba } 19290caa102dSLi Zefan 19300caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19310caa102dSLi Zefan if (IS_ERR(trans)) { 19320caa102dSLi Zefan ret = PTR_ERR(trans); 19330caa102dSLi Zefan goto out_reset; 19340caa102dSLi Zefan } 19350caa102dSLi Zefan 19360b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19370caa102dSLi Zefan &root->root_key, &root->root_item); 19389417ebc8SNikolay Borisov if (ret < 0) { 19399417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19409417ebc8SNikolay Borisov goto out_reset; 19419417ebc8SNikolay Borisov } 19420caa102dSLi Zefan 19439417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19449417ebc8SNikolay Borisov 19450caa102dSLi Zefan out_reset: 19460caa102dSLi Zefan if (ret) 19470caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1948b9ca0664SLiu Bo out_drop_sem: 19490b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1950b9ca0664SLiu Bo out_drop_write: 1951b9ca0664SLiu Bo mnt_drop_write_file(file); 1952b9ca0664SLiu Bo out: 19530caa102dSLi Zefan return ret; 19540caa102dSLi Zefan } 19550caa102dSLi Zefan 1956ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1957ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1958ac8e9819SChris Mason { 1959abc6e134SChris Mason struct btrfs_key test; 1960abc6e134SChris Mason int ret; 1961abc6e134SChris Mason 1962abc6e134SChris Mason test.objectid = sk->min_objectid; 1963abc6e134SChris Mason test.type = sk->min_type; 1964abc6e134SChris Mason test.offset = sk->min_offset; 1965abc6e134SChris Mason 1966abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1967abc6e134SChris Mason if (ret < 0) 1968ac8e9819SChris Mason return 0; 1969abc6e134SChris Mason 1970abc6e134SChris Mason test.objectid = sk->max_objectid; 1971abc6e134SChris Mason test.type = sk->max_type; 1972abc6e134SChris Mason test.offset = sk->max_offset; 1973abc6e134SChris Mason 1974abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1975abc6e134SChris Mason if (ret > 0) 1976ac8e9819SChris Mason return 0; 1977ac8e9819SChris Mason return 1; 1978ac8e9819SChris Mason } 1979ac8e9819SChris Mason 1980df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1981ac8e9819SChris Mason struct btrfs_key *key, 1982ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19839b6e817dSGerhard Heift size_t *buf_size, 1984ba346b35SGerhard Heift char __user *ubuf, 1985ac8e9819SChris Mason unsigned long *sk_offset, 1986ac8e9819SChris Mason int *num_found) 1987ac8e9819SChris Mason { 1988ac8e9819SChris Mason u64 found_transid; 1989ac8e9819SChris Mason struct extent_buffer *leaf; 1990ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1991dd81d459SNaohiro Aota struct btrfs_key test; 1992ac8e9819SChris Mason unsigned long item_off; 1993ac8e9819SChris Mason unsigned long item_len; 1994ac8e9819SChris Mason int nritems; 1995ac8e9819SChris Mason int i; 1996ac8e9819SChris Mason int slot; 1997ac8e9819SChris Mason int ret = 0; 1998ac8e9819SChris Mason 1999ac8e9819SChris Mason leaf = path->nodes[0]; 2000ac8e9819SChris Mason slot = path->slots[0]; 2001ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2002ac8e9819SChris Mason 2003ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2004ac8e9819SChris Mason i = nritems; 2005ac8e9819SChris Mason goto advance_key; 2006ac8e9819SChris Mason } 2007ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2008ac8e9819SChris Mason 2009ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2010ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2011ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2012ac8e9819SChris Mason 201303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 201403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 201503b71c6cSGabriel de Perthuis continue; 201603b71c6cSGabriel de Perthuis 20179b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20188f5f6178SGerhard Heift if (*num_found) { 2019ac8e9819SChris Mason ret = 1; 20208f5f6178SGerhard Heift goto out; 20218f5f6178SGerhard Heift } 20228f5f6178SGerhard Heift 20238f5f6178SGerhard Heift /* 20248f5f6178SGerhard Heift * return one empty item back for v1, which does not 20258f5f6178SGerhard Heift * handle -EOVERFLOW 20268f5f6178SGerhard Heift */ 20278f5f6178SGerhard Heift 20289b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2029ac8e9819SChris Mason item_len = 0; 20308f5f6178SGerhard Heift ret = -EOVERFLOW; 20318f5f6178SGerhard Heift } 2032ac8e9819SChris Mason 20339b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2034ac8e9819SChris Mason ret = 1; 203525c9bc2eSGerhard Heift goto out; 2036ac8e9819SChris Mason } 2037ac8e9819SChris Mason 2038ac8e9819SChris Mason sh.objectid = key->objectid; 2039ac8e9819SChris Mason sh.offset = key->offset; 2040ac8e9819SChris Mason sh.type = key->type; 2041ac8e9819SChris Mason sh.len = item_len; 2042ac8e9819SChris Mason sh.transid = found_transid; 2043ac8e9819SChris Mason 2044ac8e9819SChris Mason /* copy search result header */ 2045ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2046ba346b35SGerhard Heift ret = -EFAULT; 2047ba346b35SGerhard Heift goto out; 2048ba346b35SGerhard Heift } 2049ba346b35SGerhard Heift 2050ac8e9819SChris Mason *sk_offset += sizeof(sh); 2051ac8e9819SChris Mason 2052ac8e9819SChris Mason if (item_len) { 2053ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2054ac8e9819SChris Mason /* copy the item */ 2055ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2056ba346b35SGerhard Heift item_off, item_len)) { 2057ba346b35SGerhard Heift ret = -EFAULT; 2058ba346b35SGerhard Heift goto out; 2059ba346b35SGerhard Heift } 2060ba346b35SGerhard Heift 2061ac8e9819SChris Mason *sk_offset += item_len; 2062ac8e9819SChris Mason } 2063e2156867SHugo Mills (*num_found)++; 2064ac8e9819SChris Mason 20658f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20668f5f6178SGerhard Heift goto out; 20678f5f6178SGerhard Heift 206825c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 206925c9bc2eSGerhard Heift ret = 1; 207025c9bc2eSGerhard Heift goto out; 207125c9bc2eSGerhard Heift } 2072ac8e9819SChris Mason } 2073ac8e9819SChris Mason advance_key: 2074ac8e9819SChris Mason ret = 0; 2075dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2076dd81d459SNaohiro Aota test.type = sk->max_type; 2077dd81d459SNaohiro Aota test.offset = sk->max_offset; 2078dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2079dd81d459SNaohiro Aota ret = 1; 2080dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2081abc6e134SChris Mason key->offset++; 2082dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2083abc6e134SChris Mason key->offset = 0; 2084abc6e134SChris Mason key->type++; 2085dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2086abc6e134SChris Mason key->offset = 0; 2087abc6e134SChris Mason key->type = 0; 2088abc6e134SChris Mason key->objectid++; 2089abc6e134SChris Mason } else 2090abc6e134SChris Mason ret = 1; 209125c9bc2eSGerhard Heift out: 2092ba346b35SGerhard Heift /* 2093ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2094ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2095ba346b35SGerhard Heift * * all items were found 2096ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2097ba346b35SGerhard Heift * leaf 2098ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2099ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2100ba346b35SGerhard Heift */ 2101ac8e9819SChris Mason return ret; 2102ac8e9819SChris Mason } 2103ac8e9819SChris Mason 2104ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 210512544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21069b6e817dSGerhard Heift size_t *buf_size, 2107ba346b35SGerhard Heift char __user *ubuf) 2108ac8e9819SChris Mason { 21090b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2110ac8e9819SChris Mason struct btrfs_root *root; 2111ac8e9819SChris Mason struct btrfs_key key; 2112ac8e9819SChris Mason struct btrfs_path *path; 2113ac8e9819SChris Mason int ret; 2114ac8e9819SChris Mason int num_found = 0; 2115ac8e9819SChris Mason unsigned long sk_offset = 0; 2116ac8e9819SChris Mason 21179b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21189b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 211912544442SGerhard Heift return -EOVERFLOW; 21209b6e817dSGerhard Heift } 212112544442SGerhard Heift 2122ac8e9819SChris Mason path = btrfs_alloc_path(); 2123ac8e9819SChris Mason if (!path) 2124ac8e9819SChris Mason return -ENOMEM; 2125ac8e9819SChris Mason 2126ac8e9819SChris Mason if (sk->tree_id == 0) { 2127ac8e9819SChris Mason /* search the root of the inode that was passed */ 212800246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2129ac8e9819SChris Mason } else { 2130ac8e9819SChris Mason key.objectid = sk->tree_id; 2131ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2132ac8e9819SChris Mason key.offset = (u64)-1; 21333619c94fSJosef Bacik root = btrfs_get_fs_root(info, &key, true); 2134ac8e9819SChris Mason if (IS_ERR(root)) { 2135ac8e9819SChris Mason btrfs_free_path(path); 2136ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2137ac8e9819SChris Mason } 2138ac8e9819SChris Mason } 2139ac8e9819SChris Mason 2140ac8e9819SChris Mason key.objectid = sk->min_objectid; 2141ac8e9819SChris Mason key.type = sk->min_type; 2142ac8e9819SChris Mason key.offset = sk->min_offset; 2143ac8e9819SChris Mason 2144ac8e9819SChris Mason while (1) { 21456174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2146ac8e9819SChris Mason if (ret != 0) { 2147ac8e9819SChris Mason if (ret > 0) 2148ac8e9819SChris Mason ret = 0; 2149ac8e9819SChris Mason goto err; 2150ac8e9819SChris Mason } 2151df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2152ac8e9819SChris Mason &sk_offset, &num_found); 2153b3b4aa74SDavid Sterba btrfs_release_path(path); 215425c9bc2eSGerhard Heift if (ret) 2155ac8e9819SChris Mason break; 2156ac8e9819SChris Mason 2157ac8e9819SChris Mason } 21588f5f6178SGerhard Heift if (ret > 0) 2159ac8e9819SChris Mason ret = 0; 2160ac8e9819SChris Mason err: 2161ac8e9819SChris Mason sk->nr_items = num_found; 216200246528SJosef Bacik btrfs_put_root(root); 2163ac8e9819SChris Mason btrfs_free_path(path); 2164ac8e9819SChris Mason return ret; 2165ac8e9819SChris Mason } 2166ac8e9819SChris Mason 2167ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2168ac8e9819SChris Mason void __user *argp) 2169ac8e9819SChris Mason { 2170ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2171ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2172ac8e9819SChris Mason struct inode *inode; 2173ac8e9819SChris Mason int ret; 21749b6e817dSGerhard Heift size_t buf_size; 2175ac8e9819SChris Mason 2176ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2177ac8e9819SChris Mason return -EPERM; 2178ac8e9819SChris Mason 2179ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2180ac8e9819SChris Mason 2181ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2182ba346b35SGerhard Heift return -EFAULT; 2183ba346b35SGerhard Heift 2184ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2185ac8e9819SChris Mason 2186496ad9aaSAl Viro inode = file_inode(file); 2187ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 21888f5f6178SGerhard Heift 21898f5f6178SGerhard Heift /* 21908f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 21918f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 21928f5f6178SGerhard Heift */ 21938f5f6178SGerhard Heift if (ret == -EOVERFLOW) 21948f5f6178SGerhard Heift ret = 0; 21958f5f6178SGerhard Heift 2196ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2197ac8e9819SChris Mason ret = -EFAULT; 2198ac8e9819SChris Mason return ret; 2199ac8e9819SChris Mason } 2200ac8e9819SChris Mason 2201cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2202cc68a8a5SGerhard Heift void __user *argp) 2203cc68a8a5SGerhard Heift { 2204cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2205cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2206cc68a8a5SGerhard Heift struct inode *inode; 2207cc68a8a5SGerhard Heift int ret; 2208cc68a8a5SGerhard Heift size_t buf_size; 2209ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2210cc68a8a5SGerhard Heift 2211cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2212cc68a8a5SGerhard Heift return -EPERM; 2213cc68a8a5SGerhard Heift 2214cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2215cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2216cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2217cc68a8a5SGerhard Heift return -EFAULT; 2218cc68a8a5SGerhard Heift 2219cc68a8a5SGerhard Heift buf_size = args.buf_size; 2220cc68a8a5SGerhard Heift 2221cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2222cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2223cc68a8a5SGerhard Heift buf_size = buf_limit; 2224cc68a8a5SGerhard Heift 2225cc68a8a5SGerhard Heift inode = file_inode(file); 2226cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2227718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2228cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2229cc68a8a5SGerhard Heift ret = -EFAULT; 2230cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2231cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2232cc68a8a5SGerhard Heift ret = -EFAULT; 2233cc68a8a5SGerhard Heift 223476dda93cSYan, Zheng return ret; 223576dda93cSYan, Zheng } 223676dda93cSYan, Zheng 223798d377a0STARUISI Hiroaki /* 2238ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2239ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 224098d377a0STARUISI Hiroaki */ 224198d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 224298d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 224398d377a0STARUISI Hiroaki { 224498d377a0STARUISI Hiroaki struct btrfs_root *root; 224598d377a0STARUISI Hiroaki struct btrfs_key key; 2246ac8e9819SChris Mason char *ptr; 224798d377a0STARUISI Hiroaki int ret = -1; 224898d377a0STARUISI Hiroaki int slot; 224998d377a0STARUISI Hiroaki int len; 225098d377a0STARUISI Hiroaki int total_len = 0; 225198d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 225298d377a0STARUISI Hiroaki struct extent_buffer *l; 225398d377a0STARUISI Hiroaki struct btrfs_path *path; 225498d377a0STARUISI Hiroaki 225598d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 225698d377a0STARUISI Hiroaki name[0]='\0'; 225798d377a0STARUISI Hiroaki return 0; 225898d377a0STARUISI Hiroaki } 225998d377a0STARUISI Hiroaki 226098d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 226198d377a0STARUISI Hiroaki if (!path) 226298d377a0STARUISI Hiroaki return -ENOMEM; 226398d377a0STARUISI Hiroaki 2264c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 226598d377a0STARUISI Hiroaki 226698d377a0STARUISI Hiroaki key.objectid = tree_id; 226798d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 226898d377a0STARUISI Hiroaki key.offset = (u64)-1; 22693619c94fSJosef Bacik root = btrfs_get_fs_root(info, &key, true); 227098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2271ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 227288234012SJosef Bacik root = NULL; 227388234012SJosef Bacik goto out; 227488234012SJosef Bacik } 227598d377a0STARUISI Hiroaki 227698d377a0STARUISI Hiroaki key.objectid = dirid; 227798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22788ad6fcabSChris Mason key.offset = (u64)-1; 227998d377a0STARUISI Hiroaki 228098d377a0STARUISI Hiroaki while (1) { 228198d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 228298d377a0STARUISI Hiroaki if (ret < 0) 228398d377a0STARUISI Hiroaki goto out; 228418674c6cSFilipe David Borba Manana else if (ret > 0) { 228518674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 228618674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 228718674c6cSFilipe David Borba Manana if (ret < 0) 228818674c6cSFilipe David Borba Manana goto out; 228918674c6cSFilipe David Borba Manana else if (ret > 0) { 2290ac8e9819SChris Mason ret = -ENOENT; 229198d377a0STARUISI Hiroaki goto out; 2292ac8e9819SChris Mason } 229318674c6cSFilipe David Borba Manana } 229418674c6cSFilipe David Borba Manana 229518674c6cSFilipe David Borba Manana l = path->nodes[0]; 229618674c6cSFilipe David Borba Manana slot = path->slots[0]; 229718674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 229898d377a0STARUISI Hiroaki 229998d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 230098d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 230198d377a0STARUISI Hiroaki ptr -= len + 1; 230298d377a0STARUISI Hiroaki total_len += len + 1; 2303a696cf35SFilipe David Borba Manana if (ptr < name) { 2304a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 230598d377a0STARUISI Hiroaki goto out; 2306a696cf35SFilipe David Borba Manana } 230798d377a0STARUISI Hiroaki 230898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 230998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 231098d377a0STARUISI Hiroaki 231198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 231298d377a0STARUISI Hiroaki break; 231398d377a0STARUISI Hiroaki 2314b3b4aa74SDavid Sterba btrfs_release_path(path); 231598d377a0STARUISI Hiroaki key.objectid = key.offset; 23168ad6fcabSChris Mason key.offset = (u64)-1; 231798d377a0STARUISI Hiroaki dirid = key.objectid; 231898d377a0STARUISI Hiroaki } 231977906a50SLi Zefan memmove(name, ptr, total_len); 232098d377a0STARUISI Hiroaki name[total_len] = '\0'; 232198d377a0STARUISI Hiroaki ret = 0; 232298d377a0STARUISI Hiroaki out: 232300246528SJosef Bacik btrfs_put_root(root); 232498d377a0STARUISI Hiroaki btrfs_free_path(path); 2325ac8e9819SChris Mason return ret; 2326ac8e9819SChris Mason } 2327ac8e9819SChris Mason 232823d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 232923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 233023d0b79dSTomohiro Misono { 233123d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 233223d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 233323d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 233423d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 233523d0b79dSTomohiro Misono u64 dirid = args->dirid; 233623d0b79dSTomohiro Misono unsigned long item_off; 233723d0b79dSTomohiro Misono unsigned long item_len; 233823d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 233923d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2340b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 234123d0b79dSTomohiro Misono struct btrfs_path *path; 234223d0b79dSTomohiro Misono struct btrfs_key key, key2; 234323d0b79dSTomohiro Misono struct extent_buffer *leaf; 234423d0b79dSTomohiro Misono struct inode *temp_inode; 234523d0b79dSTomohiro Misono char *ptr; 234623d0b79dSTomohiro Misono int slot; 234723d0b79dSTomohiro Misono int len; 234823d0b79dSTomohiro Misono int total_len = 0; 234923d0b79dSTomohiro Misono int ret; 235023d0b79dSTomohiro Misono 235123d0b79dSTomohiro Misono path = btrfs_alloc_path(); 235223d0b79dSTomohiro Misono if (!path) 235323d0b79dSTomohiro Misono return -ENOMEM; 235423d0b79dSTomohiro Misono 235523d0b79dSTomohiro Misono /* 235623d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 235723d0b79dSTomohiro Misono * construct the path in from the bottom up. 235823d0b79dSTomohiro Misono */ 235923d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 236023d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 236123d0b79dSTomohiro Misono 236223d0b79dSTomohiro Misono key.objectid = treeid; 236323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 236423d0b79dSTomohiro Misono key.offset = (u64)-1; 23653619c94fSJosef Bacik root = btrfs_get_fs_root(fs_info, &key, true); 236623d0b79dSTomohiro Misono if (IS_ERR(root)) { 236723d0b79dSTomohiro Misono ret = PTR_ERR(root); 236823d0b79dSTomohiro Misono goto out; 236923d0b79dSTomohiro Misono } 237023d0b79dSTomohiro Misono 237123d0b79dSTomohiro Misono key.objectid = dirid; 237223d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 237323d0b79dSTomohiro Misono key.offset = (u64)-1; 237423d0b79dSTomohiro Misono while (1) { 237523d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 237623d0b79dSTomohiro Misono if (ret < 0) { 2377b8a49ae1SJosef Bacik goto out_put; 237823d0b79dSTomohiro Misono } else if (ret > 0) { 237923d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 238023d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 238123d0b79dSTomohiro Misono if (ret < 0) { 2382b8a49ae1SJosef Bacik goto out_put; 238323d0b79dSTomohiro Misono } else if (ret > 0) { 238423d0b79dSTomohiro Misono ret = -ENOENT; 2385b8a49ae1SJosef Bacik goto out_put; 238623d0b79dSTomohiro Misono } 238723d0b79dSTomohiro Misono } 238823d0b79dSTomohiro Misono 238923d0b79dSTomohiro Misono leaf = path->nodes[0]; 239023d0b79dSTomohiro Misono slot = path->slots[0]; 239123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 239223d0b79dSTomohiro Misono 239323d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 239423d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 239523d0b79dSTomohiro Misono ptr -= len + 1; 239623d0b79dSTomohiro Misono total_len += len + 1; 239723d0b79dSTomohiro Misono if (ptr < args->path) { 239823d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2399b8a49ae1SJosef Bacik goto out_put; 240023d0b79dSTomohiro Misono } 240123d0b79dSTomohiro Misono 240223d0b79dSTomohiro Misono *(ptr + len) = '/'; 240323d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 240423d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 240523d0b79dSTomohiro Misono 240623d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 240723d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 240823d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 240923d0b79dSTomohiro Misono if (ret < 0) { 2410b8a49ae1SJosef Bacik goto out_put; 241123d0b79dSTomohiro Misono } else if (ret > 0) { 241223d0b79dSTomohiro Misono ret = -ENOENT; 2413b8a49ae1SJosef Bacik goto out_put; 241423d0b79dSTomohiro Misono } 241523d0b79dSTomohiro Misono 241623d0b79dSTomohiro Misono leaf = path->nodes[0]; 241723d0b79dSTomohiro Misono slot = path->slots[0]; 241823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 241923d0b79dSTomohiro Misono if (key2.objectid != dirid) { 242023d0b79dSTomohiro Misono ret = -ENOENT; 2421b8a49ae1SJosef Bacik goto out_put; 242223d0b79dSTomohiro Misono } 242323d0b79dSTomohiro Misono 24244c66e0d4SDavid Sterba temp_inode = btrfs_iget(sb, &key2, root); 24253ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24263ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2427b8a49ae1SJosef Bacik goto out_put; 24283ca57bd6SMisono Tomohiro } 242923d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 243023d0b79dSTomohiro Misono iput(temp_inode); 243123d0b79dSTomohiro Misono if (ret) { 243223d0b79dSTomohiro Misono ret = -EACCES; 2433b8a49ae1SJosef Bacik goto out_put; 243423d0b79dSTomohiro Misono } 243523d0b79dSTomohiro Misono 243623d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 243723d0b79dSTomohiro Misono break; 243823d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 243923d0b79dSTomohiro Misono ret = -EACCES; 2440b8a49ae1SJosef Bacik goto out_put; 244123d0b79dSTomohiro Misono } 244223d0b79dSTomohiro Misono 244323d0b79dSTomohiro Misono btrfs_release_path(path); 244423d0b79dSTomohiro Misono key.objectid = key.offset; 244523d0b79dSTomohiro Misono key.offset = (u64)-1; 244623d0b79dSTomohiro Misono dirid = key.objectid; 244723d0b79dSTomohiro Misono } 244823d0b79dSTomohiro Misono 244923d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 245023d0b79dSTomohiro Misono args->path[total_len] = '\0'; 245100246528SJosef Bacik btrfs_put_root(root); 2452b8a49ae1SJosef Bacik root = NULL; 245323d0b79dSTomohiro Misono btrfs_release_path(path); 245423d0b79dSTomohiro Misono } 245523d0b79dSTomohiro Misono 245623d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 245723d0b79dSTomohiro Misono key.objectid = treeid; 245823d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 245923d0b79dSTomohiro Misono key.offset = args->treeid; 2460b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 246123d0b79dSTomohiro Misono if (ret < 0) { 246223d0b79dSTomohiro Misono goto out; 246323d0b79dSTomohiro Misono } else if (ret > 0) { 246423d0b79dSTomohiro Misono ret = -ENOENT; 246523d0b79dSTomohiro Misono goto out; 246623d0b79dSTomohiro Misono } 246723d0b79dSTomohiro Misono 246823d0b79dSTomohiro Misono leaf = path->nodes[0]; 246923d0b79dSTomohiro Misono slot = path->slots[0]; 247023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 247123d0b79dSTomohiro Misono 247223d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 247323d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 247423d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 247523d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 247623d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 247723d0b79dSTomohiro Misono ret = -EINVAL; 247823d0b79dSTomohiro Misono goto out; 247923d0b79dSTomohiro Misono } 248023d0b79dSTomohiro Misono 248123d0b79dSTomohiro Misono /* Copy subvolume's name */ 248223d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 248323d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 248423d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 248523d0b79dSTomohiro Misono args->name[item_len] = 0; 248623d0b79dSTomohiro Misono 2487b8a49ae1SJosef Bacik out_put: 248800246528SJosef Bacik btrfs_put_root(root); 248923d0b79dSTomohiro Misono out: 249023d0b79dSTomohiro Misono btrfs_free_path(path); 249123d0b79dSTomohiro Misono return ret; 249223d0b79dSTomohiro Misono } 249323d0b79dSTomohiro Misono 2494ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2495ac8e9819SChris Mason void __user *argp) 2496ac8e9819SChris Mason { 2497ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2498ac8e9819SChris Mason struct inode *inode; 249901b810b8SDavid Sterba int ret = 0; 2500ac8e9819SChris Mason 25012354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25022354d08fSJulia Lawall if (IS_ERR(args)) 25032354d08fSJulia Lawall return PTR_ERR(args); 2504c2b96929SDan Carpenter 2505496ad9aaSAl Viro inode = file_inode(file); 2506ac8e9819SChris Mason 250701b810b8SDavid Sterba /* 250801b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 250901b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 251001b810b8SDavid Sterba */ 25111b53ac4dSChris Mason if (args->treeid == 0) 25121b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25131b53ac4dSChris Mason 251401b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 251501b810b8SDavid Sterba args->name[0] = 0; 251601b810b8SDavid Sterba goto out; 251701b810b8SDavid Sterba } 251801b810b8SDavid Sterba 251901b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 252001b810b8SDavid Sterba ret = -EPERM; 252101b810b8SDavid Sterba goto out; 252201b810b8SDavid Sterba } 252301b810b8SDavid Sterba 2524ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2525ac8e9819SChris Mason args->treeid, args->objectid, 2526ac8e9819SChris Mason args->name); 2527ac8e9819SChris Mason 252801b810b8SDavid Sterba out: 2529ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2530ac8e9819SChris Mason ret = -EFAULT; 2531ac8e9819SChris Mason 2532ac8e9819SChris Mason kfree(args); 253398d377a0STARUISI Hiroaki return ret; 253498d377a0STARUISI Hiroaki } 253598d377a0STARUISI Hiroaki 253623d0b79dSTomohiro Misono /* 253723d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 253823d0b79dSTomohiro Misono * 253923d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 254023d0b79dSTomohiro Misono * 254123d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 254223d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 254323d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 254423d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 254523d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 254623d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 254723d0b79dSTomohiro Misono */ 254823d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 254923d0b79dSTomohiro Misono { 255023d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 255123d0b79dSTomohiro Misono struct inode *inode; 255223d0b79dSTomohiro Misono int ret; 255323d0b79dSTomohiro Misono 255423d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 255523d0b79dSTomohiro Misono if (IS_ERR(args)) 255623d0b79dSTomohiro Misono return PTR_ERR(args); 255723d0b79dSTomohiro Misono 255823d0b79dSTomohiro Misono inode = file_inode(file); 255923d0b79dSTomohiro Misono 256023d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 256123d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 256223d0b79dSTomohiro Misono /* 256323d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 256423d0b79dSTomohiro Misono * called 256523d0b79dSTomohiro Misono */ 256623d0b79dSTomohiro Misono kfree(args); 256723d0b79dSTomohiro Misono return -EACCES; 256823d0b79dSTomohiro Misono } 256923d0b79dSTomohiro Misono 257023d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 257123d0b79dSTomohiro Misono 257223d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 257323d0b79dSTomohiro Misono ret = -EFAULT; 257423d0b79dSTomohiro Misono 257523d0b79dSTomohiro Misono kfree(args); 257623d0b79dSTomohiro Misono return ret; 257723d0b79dSTomohiro Misono } 257823d0b79dSTomohiro Misono 2579b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2580b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2581b64ec075STomohiro Misono { 2582b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2583b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2584b64ec075STomohiro Misono struct btrfs_root *root; 2585b64ec075STomohiro Misono struct btrfs_path *path; 2586b64ec075STomohiro Misono struct btrfs_key key; 2587b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2588b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2589b64ec075STomohiro Misono struct extent_buffer *leaf; 2590b64ec075STomohiro Misono unsigned long item_off; 2591b64ec075STomohiro Misono unsigned long item_len; 2592b64ec075STomohiro Misono struct inode *inode; 2593b64ec075STomohiro Misono int slot; 2594b64ec075STomohiro Misono int ret = 0; 2595b64ec075STomohiro Misono 2596b64ec075STomohiro Misono path = btrfs_alloc_path(); 2597b64ec075STomohiro Misono if (!path) 2598b64ec075STomohiro Misono return -ENOMEM; 2599b64ec075STomohiro Misono 2600b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2601b64ec075STomohiro Misono if (!subvol_info) { 2602b64ec075STomohiro Misono btrfs_free_path(path); 2603b64ec075STomohiro Misono return -ENOMEM; 2604b64ec075STomohiro Misono } 2605b64ec075STomohiro Misono 2606b64ec075STomohiro Misono inode = file_inode(file); 2607b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2608b64ec075STomohiro Misono 2609b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2610b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 2611b64ec075STomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 2612b64ec075STomohiro Misono key.offset = (u64)-1; 26133619c94fSJosef Bacik root = btrfs_get_fs_root(fs_info, &key, true); 2614b64ec075STomohiro Misono if (IS_ERR(root)) { 2615b64ec075STomohiro Misono ret = PTR_ERR(root); 261604734e84SJosef Bacik goto out_free; 261704734e84SJosef Bacik } 2618b64ec075STomohiro Misono root_item = &root->root_item; 2619b64ec075STomohiro Misono 2620b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2621b64ec075STomohiro Misono 2622b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2623b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2624b64ec075STomohiro Misono 2625b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2626b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2627b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2628b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2629b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2630b64ec075STomohiro Misono 2631b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2632b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2633b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2634b64ec075STomohiro Misono 2635b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2636b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2637b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2638b64ec075STomohiro Misono 2639b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2640b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2641b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2642b64ec075STomohiro Misono 2643b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2644b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2645b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2646b64ec075STomohiro Misono 2647b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2648b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2649b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2650b64ec075STomohiro Misono key.offset = 0; 265104734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2652b64ec075STomohiro Misono if (ret < 0) { 2653b64ec075STomohiro Misono goto out; 2654b64ec075STomohiro Misono } else if (path->slots[0] >= 2655b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 265604734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2657b64ec075STomohiro Misono if (ret < 0) { 2658b64ec075STomohiro Misono goto out; 2659b64ec075STomohiro Misono } else if (ret > 0) { 2660b64ec075STomohiro Misono ret = -EUCLEAN; 2661b64ec075STomohiro Misono goto out; 2662b64ec075STomohiro Misono } 2663b64ec075STomohiro Misono } 2664b64ec075STomohiro Misono 2665b64ec075STomohiro Misono leaf = path->nodes[0]; 2666b64ec075STomohiro Misono slot = path->slots[0]; 2667b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2668b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2669b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2670b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2671b64ec075STomohiro Misono 2672b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2673b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2674b64ec075STomohiro Misono 2675b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2676b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2677b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2678b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2679b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2680b64ec075STomohiro Misono item_off, item_len); 2681b64ec075STomohiro Misono } else { 2682b64ec075STomohiro Misono ret = -ENOENT; 2683b64ec075STomohiro Misono goto out; 2684b64ec075STomohiro Misono } 2685b64ec075STomohiro Misono } 2686b64ec075STomohiro Misono 2687b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2688b64ec075STomohiro Misono ret = -EFAULT; 2689b64ec075STomohiro Misono 2690b64ec075STomohiro Misono out: 269100246528SJosef Bacik btrfs_put_root(root); 269204734e84SJosef Bacik out_free: 2693b64ec075STomohiro Misono btrfs_free_path(path); 2694b64ec075STomohiro Misono kzfree(subvol_info); 2695b64ec075STomohiro Misono return ret; 2696b64ec075STomohiro Misono } 2697b64ec075STomohiro Misono 269842e4b520STomohiro Misono /* 269942e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 270042e4b520STomohiro Misono * except the subvolume name. 270142e4b520STomohiro Misono */ 270242e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 270342e4b520STomohiro Misono { 270442e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 270542e4b520STomohiro Misono struct btrfs_root_ref *rref; 270642e4b520STomohiro Misono struct btrfs_root *root; 270742e4b520STomohiro Misono struct btrfs_path *path; 270842e4b520STomohiro Misono struct btrfs_key key; 270942e4b520STomohiro Misono struct extent_buffer *leaf; 271042e4b520STomohiro Misono struct inode *inode; 271142e4b520STomohiro Misono u64 objectid; 271242e4b520STomohiro Misono int slot; 271342e4b520STomohiro Misono int ret; 271442e4b520STomohiro Misono u8 found; 271542e4b520STomohiro Misono 271642e4b520STomohiro Misono path = btrfs_alloc_path(); 271742e4b520STomohiro Misono if (!path) 271842e4b520STomohiro Misono return -ENOMEM; 271942e4b520STomohiro Misono 272042e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 272142e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 272242e4b520STomohiro Misono btrfs_free_path(path); 272342e4b520STomohiro Misono return PTR_ERR(rootrefs); 272442e4b520STomohiro Misono } 272542e4b520STomohiro Misono 272642e4b520STomohiro Misono inode = file_inode(file); 272742e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 272842e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 272942e4b520STomohiro Misono 273042e4b520STomohiro Misono key.objectid = objectid; 273142e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 273242e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 273342e4b520STomohiro Misono found = 0; 273442e4b520STomohiro Misono 273542e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 273642e4b520STomohiro Misono if (ret < 0) { 273742e4b520STomohiro Misono goto out; 273842e4b520STomohiro Misono } else if (path->slots[0] >= 273942e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 274042e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 274142e4b520STomohiro Misono if (ret < 0) { 274242e4b520STomohiro Misono goto out; 274342e4b520STomohiro Misono } else if (ret > 0) { 274442e4b520STomohiro Misono ret = -EUCLEAN; 274542e4b520STomohiro Misono goto out; 274642e4b520STomohiro Misono } 274742e4b520STomohiro Misono } 274842e4b520STomohiro Misono while (1) { 274942e4b520STomohiro Misono leaf = path->nodes[0]; 275042e4b520STomohiro Misono slot = path->slots[0]; 275142e4b520STomohiro Misono 275242e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 275342e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 275442e4b520STomohiro Misono ret = 0; 275542e4b520STomohiro Misono goto out; 275642e4b520STomohiro Misono } 275742e4b520STomohiro Misono 275842e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 275942e4b520STomohiro Misono ret = -EOVERFLOW; 276042e4b520STomohiro Misono goto out; 276142e4b520STomohiro Misono } 276242e4b520STomohiro Misono 276342e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 276442e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 276542e4b520STomohiro Misono rootrefs->rootref[found].dirid = 276642e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 276742e4b520STomohiro Misono found++; 276842e4b520STomohiro Misono 276942e4b520STomohiro Misono ret = btrfs_next_item(root, path); 277042e4b520STomohiro Misono if (ret < 0) { 277142e4b520STomohiro Misono goto out; 277242e4b520STomohiro Misono } else if (ret > 0) { 277342e4b520STomohiro Misono ret = -EUCLEAN; 277442e4b520STomohiro Misono goto out; 277542e4b520STomohiro Misono } 277642e4b520STomohiro Misono } 277742e4b520STomohiro Misono 277842e4b520STomohiro Misono out: 277942e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 278042e4b520STomohiro Misono rootrefs->num_items = found; 278142e4b520STomohiro Misono /* update min_treeid for next search */ 278242e4b520STomohiro Misono if (found) 278342e4b520STomohiro Misono rootrefs->min_treeid = 278442e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 278542e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 278642e4b520STomohiro Misono ret = -EFAULT; 278742e4b520STomohiro Misono } 278842e4b520STomohiro Misono 278942e4b520STomohiro Misono kfree(rootrefs); 279042e4b520STomohiro Misono btrfs_free_path(path); 279142e4b520STomohiro Misono 279242e4b520STomohiro Misono return ret; 279342e4b520STomohiro Misono } 279442e4b520STomohiro Misono 279576dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2796949964c9SMarcos Paulo de Souza void __user *arg, 2797949964c9SMarcos Paulo de Souza bool destroy_v2) 279876dda93cSYan, Zheng { 279954563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 280176dda93cSYan, Zheng struct dentry *dentry; 28022b0143b5SDavid Howells struct inode *dir = d_inode(parent); 280376dda93cSYan, Zheng struct inode *inode; 280476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 280576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2806949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2807949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2808949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2809949964c9SMarcos Paulo de Souza int subvol_namelen; 281076dda93cSYan, Zheng int err = 0; 2811949964c9SMarcos Paulo de Souza bool destroy_parent = false; 281276dda93cSYan, Zheng 2813949964c9SMarcos Paulo de Souza if (destroy_v2) { 2814949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2815949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2816949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2817325c50e3SJeff Mahoney 2818949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2819949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2820949964c9SMarcos Paulo de Souza goto out; 2821949964c9SMarcos Paulo de Souza } 282276dda93cSYan, Zheng 2823949964c9SMarcos Paulo de Souza /* 2824949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2825949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2826949964c9SMarcos Paulo de Souza */ 2827949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2828949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2829949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2830949964c9SMarcos Paulo de Souza 2831949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2832949964c9SMarcos Paulo de Souza if (err) 2833949964c9SMarcos Paulo de Souza goto out; 2834949964c9SMarcos Paulo de Souza } else { 2835949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 283676dda93cSYan, Zheng err = -EINVAL; 283776dda93cSYan, Zheng goto out; 283876dda93cSYan, Zheng } 283976dda93cSYan, Zheng 2840a561be71SAl Viro err = mnt_want_write_file(file); 284176dda93cSYan, Zheng if (err) 284276dda93cSYan, Zheng goto out; 284376dda93cSYan, Zheng 2844949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2845949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2846949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2847949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2848949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2849949964c9SMarcos Paulo de Souza goto out_drop_write; 2850949964c9SMarcos Paulo de Souza } 2851949964c9SMarcos Paulo de Souza 2852949964c9SMarcos Paulo de Souza /* 2853949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2854949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2855949964c9SMarcos Paulo de Souza */ 2856949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2857949964c9SMarcos Paulo de Souza 2858949964c9SMarcos Paulo de Souza /* 2859949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2860949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2861949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2862949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2863949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2864949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2865949964c9SMarcos Paulo de Souza */ 2866949964c9SMarcos Paulo de Souza dput(dentry); 2867949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2868949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2869949964c9SMarcos Paulo de Souza goto out_drop_write; 2870949964c9SMarcos Paulo de Souza } 2871949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2872949964c9SMarcos Paulo de Souza 2873949964c9SMarcos Paulo de Souza /* 2874949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2875949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2876949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2877949964c9SMarcos Paulo de Souza * new parent dentry. 2878949964c9SMarcos Paulo de Souza */ 2879949964c9SMarcos Paulo de Souza destroy_parent = true; 2880949964c9SMarcos Paulo de Souza 2881949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2882949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2883949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2884949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2885949964c9SMarcos Paulo de Souza goto free_parent; 2886949964c9SMarcos Paulo de Souza } 2887949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2888949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2889949964c9SMarcos Paulo de Souza } 2890949964c9SMarcos Paulo de Souza } else { 2891949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2892949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2893949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2894949964c9SMarcos Paulo de Souza 2895949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2896949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2897949964c9SMarcos Paulo de Souza 2898949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2899949964c9SMarcos Paulo de Souza if (err) 2900949964c9SMarcos Paulo de Souza goto out; 2901949964c9SMarcos Paulo de Souza } 2902949964c9SMarcos Paulo de Souza 2903949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2904949964c9SMarcos Paulo de Souza 2905949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2906949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2907949964c9SMarcos Paulo de Souza err = -EINVAL; 2908949964c9SMarcos Paulo de Souza goto free_subvol_name; 2909949964c9SMarcos Paulo de Souza } 2910949964c9SMarcos Paulo de Souza 2911949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2912949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2913949964c9SMarcos Paulo de Souza goto free_subvol_name; 2914949964c9SMarcos Paulo de Souza } 2915521e0546SDavid Sterba 291600235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 291700235411SAl Viro if (err == -EINTR) 2918949964c9SMarcos Paulo de Souza goto free_subvol_name; 2919949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 292076dda93cSYan, Zheng if (IS_ERR(dentry)) { 292176dda93cSYan, Zheng err = PTR_ERR(dentry); 292276dda93cSYan, Zheng goto out_unlock_dir; 292376dda93cSYan, Zheng } 292476dda93cSYan, Zheng 29252b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 292676dda93cSYan, Zheng err = -ENOENT; 292776dda93cSYan, Zheng goto out_dput; 292876dda93cSYan, Zheng } 292976dda93cSYan, Zheng 29302b0143b5SDavid Howells inode = d_inode(dentry); 29314260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29324260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29334260f7c7SSage Weil /* 29344260f7c7SSage Weil * Regular user. Only allow this with a special mount 29354260f7c7SSage Weil * option, when the user has write+exec access to the 29364260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29374260f7c7SSage Weil * allowed. 29384260f7c7SSage Weil * 29394260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29404260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29414260f7c7SSage Weil * otherwise be able to delete. 29424260f7c7SSage Weil * 29434260f7c7SSage Weil * Users who want to delete empty subvols should try 29444260f7c7SSage Weil * rmdir(2). 29454260f7c7SSage Weil */ 29464260f7c7SSage Weil err = -EPERM; 29470b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29484260f7c7SSage Weil goto out_dput; 29494260f7c7SSage Weil 29504260f7c7SSage Weil /* 29514260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29524260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 29534260f7c7SSage Weil * must be called on the dentry referencing the root 29544260f7c7SSage Weil * of the subvol, not a random directory contained 29554260f7c7SSage Weil * within it. 29564260f7c7SSage Weil */ 29574260f7c7SSage Weil err = -EINVAL; 29584260f7c7SSage Weil if (root == dest) 29594260f7c7SSage Weil goto out_dput; 29604260f7c7SSage Weil 29614260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 29624260f7c7SSage Weil if (err) 29634260f7c7SSage Weil goto out_dput; 29645c39da5bSMiao Xie } 29654260f7c7SSage Weil 29665c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29674260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29684260f7c7SSage Weil if (err) 29694260f7c7SSage Weil goto out_dput; 29704260f7c7SSage Weil 29714a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 297276dda93cSYan, Zheng err = -EINVAL; 297376dda93cSYan, Zheng goto out_dput; 297476dda93cSYan, Zheng } 297576dda93cSYan, Zheng 29765955102cSAl Viro inode_lock(inode); 2977f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 29785955102cSAl Viro inode_unlock(inode); 297946008d9dSAmir Goldstein if (!err) { 298046008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 298176dda93cSYan, Zheng d_delete(dentry); 298246008d9dSAmir Goldstein } 2983fa6ac876SLiu Bo 298476dda93cSYan, Zheng out_dput: 298576dda93cSYan, Zheng dput(dentry); 298676dda93cSYan, Zheng out_unlock_dir: 29875955102cSAl Viro inode_unlock(dir); 2988949964c9SMarcos Paulo de Souza free_subvol_name: 2989949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2990949964c9SMarcos Paulo de Souza free_parent: 2991949964c9SMarcos Paulo de Souza if (destroy_parent) 2992949964c9SMarcos Paulo de Souza dput(parent); 299300235411SAl Viro out_drop_write: 29942a79f17eSAl Viro mnt_drop_write_file(file); 299576dda93cSYan, Zheng out: 2996949964c9SMarcos Paulo de Souza kfree(vol_args2); 299776dda93cSYan, Zheng kfree(vol_args); 299876dda93cSYan, Zheng return err; 299976dda93cSYan, Zheng } 300076dda93cSYan, Zheng 30011e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3002f46b5a66SChristoph Hellwig { 3003496ad9aaSAl Viro struct inode *inode = file_inode(file); 3004f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30051e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3006c146afadSYan Zheng int ret; 3007c146afadSYan Zheng 300825122d15SIlya Dryomov ret = mnt_want_write_file(file); 300925122d15SIlya Dryomov if (ret) 301025122d15SIlya Dryomov return ret; 3011b83cc969SLi Zefan 301225122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 301325122d15SIlya Dryomov ret = -EROFS; 301425122d15SIlya Dryomov goto out; 30155ac00addSStefan Behrens } 3016f46b5a66SChristoph Hellwig 3017f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3018f46b5a66SChristoph Hellwig case S_IFDIR: 3019e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3020e441d54dSChris Mason ret = -EPERM; 3021e441d54dSChris Mason goto out; 3022e441d54dSChris Mason } 3023de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3024f46b5a66SChristoph Hellwig break; 3025f46b5a66SChristoph Hellwig case S_IFREG: 3026616d374eSAdam Borowski /* 3027616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3028616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3029616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3030616d374eSAdam Borowski */ 3031616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3032616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3033616d374eSAdam Borowski ret = -EPERM; 3034e441d54dSChris Mason goto out; 3035e441d54dSChris Mason } 30361e701a32SChris Mason 30371e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30381e701a32SChris Mason if (!range) { 30391e701a32SChris Mason ret = -ENOMEM; 30401e701a32SChris Mason goto out; 30411e701a32SChris Mason } 30421e701a32SChris Mason 30431e701a32SChris Mason if (argp) { 30441e701a32SChris Mason if (copy_from_user(range, argp, 30451e701a32SChris Mason sizeof(*range))) { 30461e701a32SChris Mason ret = -EFAULT; 30471e701a32SChris Mason kfree(range); 3048683be16eSDan Carpenter goto out; 30491e701a32SChris Mason } 30501e701a32SChris Mason /* compression requires us to start the IO */ 30511e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30521e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 30531e701a32SChris Mason range->extent_thresh = (u32)-1; 30541e701a32SChris Mason } 30551e701a32SChris Mason } else { 30561e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 30571e701a32SChris Mason range->len = (u64)-1; 30581e701a32SChris Mason } 3059496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 30607c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 30614cb5300bSChris Mason if (ret > 0) 30624cb5300bSChris Mason ret = 0; 30631e701a32SChris Mason kfree(range); 3064f46b5a66SChristoph Hellwig break; 30658929ecfaSYan, Zheng default: 30668929ecfaSYan, Zheng ret = -EINVAL; 3067f46b5a66SChristoph Hellwig } 3068e441d54dSChris Mason out: 306925122d15SIlya Dryomov mnt_drop_write_file(file); 3070e441d54dSChris Mason return ret; 3071f46b5a66SChristoph Hellwig } 3072f46b5a66SChristoph Hellwig 30732ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3074f46b5a66SChristoph Hellwig { 3075f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3076f46b5a66SChristoph Hellwig int ret; 3077f46b5a66SChristoph Hellwig 3078e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3079e441d54dSChris Mason return -EPERM; 3080e441d54dSChris Mason 3081171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3082e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3083c9e9f97bSIlya Dryomov 3084dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3085c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3086c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3087c9e9f97bSIlya Dryomov goto out; 3088c9e9f97bSIlya Dryomov } 3089f46b5a66SChristoph Hellwig 30905516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 30912ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3092f46b5a66SChristoph Hellwig 309343d20761SAnand Jain if (!ret) 30940b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 309543d20761SAnand Jain 3096f46b5a66SChristoph Hellwig kfree(vol_args); 3097c9e9f97bSIlya Dryomov out: 3098171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3099f46b5a66SChristoph Hellwig return ret; 3100f46b5a66SChristoph Hellwig } 3101f46b5a66SChristoph Hellwig 31026b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3103f46b5a66SChristoph Hellwig { 31040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31066b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3107f46b5a66SChristoph Hellwig int ret; 3108f46b5a66SChristoph Hellwig 3109e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3110e441d54dSChris Mason return -EPERM; 3111e441d54dSChris Mason 3112da24927bSMiao Xie ret = mnt_want_write_file(file); 3113da24927bSMiao Xie if (ret) 3114da24927bSMiao Xie return ret; 3115c146afadSYan Zheng 3116dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3117c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3118c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3119c47ca32dSDan Carpenter goto err_drop; 3120c9e9f97bSIlya Dryomov } 3121f46b5a66SChristoph Hellwig 3122748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3123fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3124fd4e994bSOmar Sandoval goto out; 3125fd4e994bSOmar Sandoval } 3126f46b5a66SChristoph Hellwig 3127171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3128183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3129183860f6SAnand Jain goto out; 3130183860f6SAnand Jain } 3131183860f6SAnand Jain 3132735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31332ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31346b526ed7SAnand Jain } else { 31356b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31362ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31376b526ed7SAnand Jain } 3138171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3139183860f6SAnand Jain 31406b526ed7SAnand Jain if (!ret) { 3141735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31420b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31436b526ed7SAnand Jain vol_args->devid); 31446b526ed7SAnand Jain else 31450b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31466b526ed7SAnand Jain vol_args->name); 31476b526ed7SAnand Jain } 3148183860f6SAnand Jain out: 3149183860f6SAnand Jain kfree(vol_args); 3150c47ca32dSDan Carpenter err_drop: 31514ac20c70SIlya Dryomov mnt_drop_write_file(file); 3152f46b5a66SChristoph Hellwig return ret; 3153f46b5a66SChristoph Hellwig } 3154f46b5a66SChristoph Hellwig 3155f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3156f46b5a66SChristoph Hellwig { 31570b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31580b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3159f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3160f46b5a66SChristoph Hellwig int ret; 3161f46b5a66SChristoph Hellwig 3162f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3163f46b5a66SChristoph Hellwig return -EPERM; 3164f46b5a66SChristoph Hellwig 3165f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3166f46b5a66SChristoph Hellwig if (ret) 3167f46b5a66SChristoph Hellwig return ret; 3168f46b5a66SChristoph Hellwig 3169171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3170f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 317158d7bbf8SDavid Sterba goto out_drop_write; 317258d7bbf8SDavid Sterba } 317358d7bbf8SDavid Sterba 317458d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 317558d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 317658d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3177f46b5a66SChristoph Hellwig goto out; 3178f46b5a66SChristoph Hellwig } 3179f46b5a66SChristoph Hellwig 318058d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31812ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3182f46b5a66SChristoph Hellwig 3183f46b5a66SChristoph Hellwig if (!ret) 31840b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3185f46b5a66SChristoph Hellwig kfree(vol_args); 318658d7bbf8SDavid Sterba out: 3187171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 318858d7bbf8SDavid Sterba out_drop_write: 3189f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 319058d7bbf8SDavid Sterba 3191f46b5a66SChristoph Hellwig return ret; 3192f46b5a66SChristoph Hellwig } 3193f46b5a66SChristoph Hellwig 31942ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 31952ff7e61eSJeff Mahoney void __user *arg) 3196475f6387SJan Schmidt { 3197027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3198475f6387SJan Schmidt struct btrfs_device *device; 31990b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3200027ed2f0SLi Zefan int ret = 0; 3201475f6387SJan Schmidt 3202027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 3203027ed2f0SLi Zefan if (!fi_args) 3204027ed2f0SLi Zefan return -ENOMEM; 3205027ed2f0SLi Zefan 3206d03262c7SDavid Sterba rcu_read_lock(); 3207027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3208475f6387SJan Schmidt 3209d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3210027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3211027ed2f0SLi Zefan fi_args->max_id = device->devid; 3212475f6387SJan Schmidt } 3213d03262c7SDavid Sterba rcu_read_unlock(); 3214475f6387SJan Schmidt 3215de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3216bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3217bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3218bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 321980a773fbSDavid Sterba 3220027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3221027ed2f0SLi Zefan ret = -EFAULT; 3222475f6387SJan Schmidt 3223027ed2f0SLi Zefan kfree(fi_args); 3224027ed2f0SLi Zefan return ret; 3225475f6387SJan Schmidt } 3226475f6387SJan Schmidt 32272ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32282ff7e61eSJeff Mahoney void __user *arg) 3229475f6387SJan Schmidt { 3230475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3231475f6387SJan Schmidt struct btrfs_device *dev; 3232475f6387SJan Schmidt int ret = 0; 3233475f6387SJan Schmidt char *s_uuid = NULL; 3234475f6387SJan Schmidt 3235475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3236475f6387SJan Schmidt if (IS_ERR(di_args)) 3237475f6387SJan Schmidt return PTR_ERR(di_args); 3238475f6387SJan Schmidt 3239dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3240475f6387SJan Schmidt s_uuid = di_args->uuid; 3241475f6387SJan Schmidt 3242c5593ca3SDavid Sterba rcu_read_lock(); 3243e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 324409ba3bc9SAnand Jain NULL, true); 3245475f6387SJan Schmidt 3246475f6387SJan Schmidt if (!dev) { 3247475f6387SJan Schmidt ret = -ENODEV; 3248475f6387SJan Schmidt goto out; 3249475f6387SJan Schmidt } 3250475f6387SJan Schmidt 3251475f6387SJan Schmidt di_args->devid = dev->devid; 32527cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 32537cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3254475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3255a27202fbSJim Meyering if (dev->name) { 3256672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3257672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3258a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3259a27202fbSJim Meyering } else { 326099ba55adSStefan Behrens di_args->path[0] = '\0'; 3261a27202fbSJim Meyering } 3262475f6387SJan Schmidt 3263475f6387SJan Schmidt out: 3264c5593ca3SDavid Sterba rcu_read_unlock(); 3265475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3266475f6387SJan Schmidt ret = -EFAULT; 3267475f6387SJan Schmidt 3268475f6387SJan Schmidt kfree(di_args); 3269475f6387SJan Schmidt return ret; 3270475f6387SJan Schmidt } 3271475f6387SJan Schmidt 32726ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32736ef5ed0dSJosef Bacik { 3274496ad9aaSAl Viro struct inode *inode = file_inode(file); 32750b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32766ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32776ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32786ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32796ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32802a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 32816ef5ed0dSJosef Bacik struct btrfs_key location; 32826ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 32836ef5ed0dSJosef Bacik u64 objectid = 0; 32846ef5ed0dSJosef Bacik u64 dir_id; 32853c04ce01SMiao Xie int ret; 32866ef5ed0dSJosef Bacik 32876ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 32886ef5ed0dSJosef Bacik return -EPERM; 32896ef5ed0dSJosef Bacik 32903c04ce01SMiao Xie ret = mnt_want_write_file(file); 32913c04ce01SMiao Xie if (ret) 32923c04ce01SMiao Xie return ret; 32933c04ce01SMiao Xie 32943c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 32953c04ce01SMiao Xie ret = -EFAULT; 32963c04ce01SMiao Xie goto out; 32973c04ce01SMiao Xie } 32986ef5ed0dSJosef Bacik 32996ef5ed0dSJosef Bacik if (!objectid) 33001cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33016ef5ed0dSJosef Bacik 33026ef5ed0dSJosef Bacik location.objectid = objectid; 33036ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33046ef5ed0dSJosef Bacik location.offset = (u64)-1; 33056ef5ed0dSJosef Bacik 33063619c94fSJosef Bacik new_root = btrfs_get_fs_root(fs_info, &location, true); 33073c04ce01SMiao Xie if (IS_ERR(new_root)) { 33083c04ce01SMiao Xie ret = PTR_ERR(new_root); 33093c04ce01SMiao Xie goto out; 33103c04ce01SMiao Xie } 33112a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33122a2b5d62SJosef Bacik ret = -ENOENT; 33132a2b5d62SJosef Bacik goto out_free; 33142a2b5d62SJosef Bacik } 33156ef5ed0dSJosef Bacik 33166ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33173c04ce01SMiao Xie if (!path) { 33183c04ce01SMiao Xie ret = -ENOMEM; 33192a2b5d62SJosef Bacik goto out_free; 33203c04ce01SMiao Xie } 33216ef5ed0dSJosef Bacik path->leave_spinning = 1; 33226ef5ed0dSJosef Bacik 33236ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 332498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33253c04ce01SMiao Xie ret = PTR_ERR(trans); 33262a2b5d62SJosef Bacik goto out_free; 33276ef5ed0dSJosef Bacik } 33286ef5ed0dSJosef Bacik 33290b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33300b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33316ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3332cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33332a2b5d62SJosef Bacik btrfs_release_path(path); 33343a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33350b246afaSJeff Mahoney btrfs_err(fs_info, 33365d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 33373c04ce01SMiao Xie ret = -ENOENT; 33382a2b5d62SJosef Bacik goto out_free; 33396ef5ed0dSJosef Bacik } 33406ef5ed0dSJosef Bacik 33416ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33426ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33436ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33442a2b5d62SJosef Bacik btrfs_release_path(path); 33456ef5ed0dSJosef Bacik 33460b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 33473a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33482a2b5d62SJosef Bacik out_free: 334900246528SJosef Bacik btrfs_put_root(new_root); 33502a2b5d62SJosef Bacik btrfs_free_path(path); 33513c04ce01SMiao Xie out: 33523c04ce01SMiao Xie mnt_drop_write_file(file); 33533c04ce01SMiao Xie return ret; 33546ef5ed0dSJosef Bacik } 33556ef5ed0dSJosef Bacik 3356c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3357bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3358bf5fc093SJosef Bacik { 335932da5386SDavid Sterba struct btrfs_block_group *block_group; 3360bf5fc093SJosef Bacik 3361bf5fc093SJosef Bacik space->total_bytes = 0; 3362bf5fc093SJosef Bacik space->used_bytes = 0; 3363bf5fc093SJosef Bacik space->flags = 0; 3364bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3365bf5fc093SJosef Bacik space->flags = block_group->flags; 3366b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3367bf38be65SDavid Sterba space->used_bytes += block_group->used; 3368bf5fc093SJosef Bacik } 3369bf5fc093SJosef Bacik } 3370bf5fc093SJosef Bacik 33712ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 33722ff7e61eSJeff Mahoney void __user *arg) 33731406e432SJosef Bacik { 33741406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33751406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33761406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33777fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 337813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33791406e432SJosef Bacik struct btrfs_space_info *info; 3380315d8e98SColin Ian King static const u64 types[] = { 3381315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3382bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3383bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3384315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3385315d8e98SColin Ian King }; 3386bf5fc093SJosef Bacik int num_types = 4; 33877fde62bfSChris Mason int alloc_size; 33881406e432SJosef Bacik int ret = 0; 338951788b1bSDan Rosenberg u64 slot_count = 0; 3390bf5fc093SJosef Bacik int i, c; 33911406e432SJosef Bacik 33921406e432SJosef Bacik if (copy_from_user(&space_args, 33931406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 33941406e432SJosef Bacik sizeof(space_args))) 33951406e432SJosef Bacik return -EFAULT; 33961406e432SJosef Bacik 3397bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3398bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3399bf5fc093SJosef Bacik 3400bf5fc093SJosef Bacik info = NULL; 34017fde62bfSChris Mason rcu_read_lock(); 34020b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3403bf5fc093SJosef Bacik list) { 3404bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3405bf5fc093SJosef Bacik info = tmp; 3406bf5fc093SJosef Bacik break; 3407bf5fc093SJosef Bacik } 3408bf5fc093SJosef Bacik } 34097fde62bfSChris Mason rcu_read_unlock(); 34101406e432SJosef Bacik 3411bf5fc093SJosef Bacik if (!info) 3412bf5fc093SJosef Bacik continue; 3413bf5fc093SJosef Bacik 3414bf5fc093SJosef Bacik down_read(&info->groups_sem); 3415bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3416bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3417bf5fc093SJosef Bacik slot_count++; 3418bf5fc093SJosef Bacik } 3419bf5fc093SJosef Bacik up_read(&info->groups_sem); 3420bf5fc093SJosef Bacik } 3421bf5fc093SJosef Bacik 342236523e95SDavid Sterba /* 342336523e95SDavid Sterba * Global block reserve, exported as a space_info 342436523e95SDavid Sterba */ 342536523e95SDavid Sterba slot_count++; 342636523e95SDavid Sterba 34277fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34287fde62bfSChris Mason if (space_args.space_slots == 0) { 34297fde62bfSChris Mason space_args.total_spaces = slot_count; 34307fde62bfSChris Mason goto out; 34317fde62bfSChris Mason } 3432bf5fc093SJosef Bacik 343351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3434bf5fc093SJosef Bacik 34357fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3436bf5fc093SJosef Bacik 34377fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34387fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34397fde62bfSChris Mason */ 344009cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 34417fde62bfSChris Mason return -ENOMEM; 34427fde62bfSChris Mason 34437fde62bfSChris Mason space_args.total_spaces = 0; 34448d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 34457fde62bfSChris Mason if (!dest) 34467fde62bfSChris Mason return -ENOMEM; 34477fde62bfSChris Mason dest_orig = dest; 34487fde62bfSChris Mason 34497fde62bfSChris Mason /* now we have a buffer to copy into */ 3450bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3451bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3452bf5fc093SJosef Bacik 345351788b1bSDan Rosenberg if (!slot_count) 345451788b1bSDan Rosenberg break; 345551788b1bSDan Rosenberg 3456bf5fc093SJosef Bacik info = NULL; 34571406e432SJosef Bacik rcu_read_lock(); 34580b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3459bf5fc093SJosef Bacik list) { 3460bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3461bf5fc093SJosef Bacik info = tmp; 34627fde62bfSChris Mason break; 3463bf5fc093SJosef Bacik } 3464bf5fc093SJosef Bacik } 3465bf5fc093SJosef Bacik rcu_read_unlock(); 34667fde62bfSChris Mason 3467bf5fc093SJosef Bacik if (!info) 3468bf5fc093SJosef Bacik continue; 3469bf5fc093SJosef Bacik down_read(&info->groups_sem); 3470bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3471bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3472c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3473c065f5b1SSu Yue &space); 34747fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34751406e432SJosef Bacik dest++; 34761406e432SJosef Bacik space_args.total_spaces++; 347751788b1bSDan Rosenberg slot_count--; 34781406e432SJosef Bacik } 347951788b1bSDan Rosenberg if (!slot_count) 348051788b1bSDan Rosenberg break; 3481bf5fc093SJosef Bacik } 3482bf5fc093SJosef Bacik up_read(&info->groups_sem); 3483bf5fc093SJosef Bacik } 34841406e432SJosef Bacik 348536523e95SDavid Sterba /* 348636523e95SDavid Sterba * Add global block reserve 348736523e95SDavid Sterba */ 348836523e95SDavid Sterba if (slot_count) { 34890b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 349036523e95SDavid Sterba 349136523e95SDavid Sterba spin_lock(&block_rsv->lock); 349236523e95SDavid Sterba space.total_bytes = block_rsv->size; 349336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 349436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 349536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 349636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 349736523e95SDavid Sterba space_args.total_spaces++; 349836523e95SDavid Sterba } 349936523e95SDavid Sterba 35002eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35017fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35027fde62bfSChris Mason 35037fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35047fde62bfSChris Mason ret = -EFAULT; 35057fde62bfSChris Mason 35067fde62bfSChris Mason kfree(dest_orig); 35077fde62bfSChris Mason out: 35087fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35091406e432SJosef Bacik ret = -EFAULT; 35101406e432SJosef Bacik 35111406e432SJosef Bacik return ret; 35121406e432SJosef Bacik } 35131406e432SJosef Bacik 35149a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35159a8c28beSMiao Xie void __user *argp) 351646204592SSage Weil { 351746204592SSage Weil struct btrfs_trans_handle *trans; 351846204592SSage Weil u64 transid; 3519db5b493aSTsutomu Itoh int ret; 352046204592SSage Weil 3521d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3522ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3523ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 352498d5dc13STsutomu Itoh return PTR_ERR(trans); 3525ff7c1d33SMiao Xie 3526ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3527ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3528ff7c1d33SMiao Xie goto out; 3529ff7c1d33SMiao Xie } 353046204592SSage Weil transid = trans->transid; 35313a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35328b2b2d3cSTsutomu Itoh if (ret) { 35333a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3534db5b493aSTsutomu Itoh return ret; 35358b2b2d3cSTsutomu Itoh } 3536ff7c1d33SMiao Xie out: 353746204592SSage Weil if (argp) 353846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 353946204592SSage Weil return -EFAULT; 354046204592SSage Weil return 0; 354146204592SSage Weil } 354246204592SSage Weil 35432ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 35449a8c28beSMiao Xie void __user *argp) 354546204592SSage Weil { 354646204592SSage Weil u64 transid; 354746204592SSage Weil 354846204592SSage Weil if (argp) { 354946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 355046204592SSage Weil return -EFAULT; 355146204592SSage Weil } else { 355246204592SSage Weil transid = 0; /* current trans */ 355346204592SSage Weil } 35542ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 355546204592SSage Weil } 355646204592SSage Weil 3557b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3558475f6387SJan Schmidt { 35590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3560475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3561b8e95489SMiao Xie int ret; 3562475f6387SJan Schmidt 3563475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3564475f6387SJan Schmidt return -EPERM; 3565475f6387SJan Schmidt 3566475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3567475f6387SJan Schmidt if (IS_ERR(sa)) 3568475f6387SJan Schmidt return PTR_ERR(sa); 3569475f6387SJan Schmidt 3570b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3571b8e95489SMiao Xie ret = mnt_want_write_file(file); 3572b8e95489SMiao Xie if (ret) 3573b8e95489SMiao Xie goto out; 3574b8e95489SMiao Xie } 3575b8e95489SMiao Xie 35760b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 357763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 357863a212abSStefan Behrens 0); 3579475f6387SJan Schmidt 35805afe6ce7SFilipe Manana /* 35815afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 35825afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 35835afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 35845afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 35855afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 35865afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 35875afe6ce7SFilipe Manana * previously (btrfs-progs does this). 35885afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 35895afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 35905afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 35915afe6ce7SFilipe Manana */ 35925afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3593475f6387SJan Schmidt ret = -EFAULT; 3594475f6387SJan Schmidt 3595b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3596b8e95489SMiao Xie mnt_drop_write_file(file); 3597b8e95489SMiao Xie out: 3598475f6387SJan Schmidt kfree(sa); 3599475f6387SJan Schmidt return ret; 3600475f6387SJan Schmidt } 3601475f6387SJan Schmidt 36022ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3603475f6387SJan Schmidt { 3604475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3605475f6387SJan Schmidt return -EPERM; 3606475f6387SJan Schmidt 36072ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3608475f6387SJan Schmidt } 3609475f6387SJan Schmidt 36102ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3611475f6387SJan Schmidt void __user *arg) 3612475f6387SJan Schmidt { 3613475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3614475f6387SJan Schmidt int ret; 3615475f6387SJan Schmidt 3616475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3617475f6387SJan Schmidt return -EPERM; 3618475f6387SJan Schmidt 3619475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3620475f6387SJan Schmidt if (IS_ERR(sa)) 3621475f6387SJan Schmidt return PTR_ERR(sa); 3622475f6387SJan Schmidt 36232ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3624475f6387SJan Schmidt 36254fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3626475f6387SJan Schmidt ret = -EFAULT; 3627475f6387SJan Schmidt 3628475f6387SJan Schmidt kfree(sa); 3629475f6387SJan Schmidt return ret; 3630475f6387SJan Schmidt } 3631475f6387SJan Schmidt 36322ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3633b27f7c0cSDavid Sterba void __user *arg) 3634c11d2c23SStefan Behrens { 3635c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3636c11d2c23SStefan Behrens int ret; 3637c11d2c23SStefan Behrens 3638c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3639c11d2c23SStefan Behrens if (IS_ERR(sa)) 3640c11d2c23SStefan Behrens return PTR_ERR(sa); 3641c11d2c23SStefan Behrens 3642b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3643b27f7c0cSDavid Sterba kfree(sa); 3644b27f7c0cSDavid Sterba return -EPERM; 3645b27f7c0cSDavid Sterba } 3646b27f7c0cSDavid Sterba 36472ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3648c11d2c23SStefan Behrens 3649eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3650c11d2c23SStefan Behrens ret = -EFAULT; 3651c11d2c23SStefan Behrens 3652c11d2c23SStefan Behrens kfree(sa); 3653c11d2c23SStefan Behrens return ret; 3654c11d2c23SStefan Behrens } 3655c11d2c23SStefan Behrens 36562ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 36572ff7e61eSJeff Mahoney void __user *arg) 36583f6bcfbdSStefan Behrens { 36593f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36603f6bcfbdSStefan Behrens int ret; 36613f6bcfbdSStefan Behrens 36623f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36633f6bcfbdSStefan Behrens return -EPERM; 36643f6bcfbdSStefan Behrens 36653f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36663f6bcfbdSStefan Behrens if (IS_ERR(p)) 36673f6bcfbdSStefan Behrens return PTR_ERR(p); 36683f6bcfbdSStefan Behrens 36693f6bcfbdSStefan Behrens switch (p->cmd) { 36703f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3671bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3672adfa97cbSIlya Dryomov ret = -EROFS; 3673adfa97cbSIlya Dryomov goto out; 3674adfa97cbSIlya Dryomov } 3675171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3676e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 36773f6bcfbdSStefan Behrens } else { 36782ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3679171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 36803f6bcfbdSStefan Behrens } 36813f6bcfbdSStefan Behrens break; 36823f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36830b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 36843f6bcfbdSStefan Behrens ret = 0; 36853f6bcfbdSStefan Behrens break; 36863f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 368717d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 368897282031SAnand Jain ret = 0; 36893f6bcfbdSStefan Behrens break; 36903f6bcfbdSStefan Behrens default: 36913f6bcfbdSStefan Behrens ret = -EINVAL; 36923f6bcfbdSStefan Behrens break; 36933f6bcfbdSStefan Behrens } 36943f6bcfbdSStefan Behrens 3695d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 36963f6bcfbdSStefan Behrens ret = -EFAULT; 3697adfa97cbSIlya Dryomov out: 36983f6bcfbdSStefan Behrens kfree(p); 36993f6bcfbdSStefan Behrens return ret; 37003f6bcfbdSStefan Behrens } 37013f6bcfbdSStefan Behrens 3702d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3703d7728c96SJan Schmidt { 3704d7728c96SJan Schmidt int ret = 0; 3705d7728c96SJan Schmidt int i; 3706740c3d22SChris Mason u64 rel_ptr; 3707d7728c96SJan Schmidt int size; 3708806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3709d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3710d7728c96SJan Schmidt struct btrfs_path *path; 3711d7728c96SJan Schmidt 371282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3713d7728c96SJan Schmidt return -EPERM; 3714d7728c96SJan Schmidt 3715d7728c96SJan Schmidt path = btrfs_alloc_path(); 3716d7728c96SJan Schmidt if (!path) { 3717d7728c96SJan Schmidt ret = -ENOMEM; 3718d7728c96SJan Schmidt goto out; 3719d7728c96SJan Schmidt } 3720d7728c96SJan Schmidt 3721d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3722d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3723d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3724d7728c96SJan Schmidt ipa = NULL; 3725d7728c96SJan Schmidt goto out; 3726d7728c96SJan Schmidt } 3727d7728c96SJan Schmidt 3728d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3729d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3730d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3731d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3732d7728c96SJan Schmidt ipath = NULL; 3733d7728c96SJan Schmidt goto out; 3734d7728c96SJan Schmidt } 3735d7728c96SJan Schmidt 3736d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3737d7728c96SJan Schmidt if (ret < 0) 3738d7728c96SJan Schmidt goto out; 3739d7728c96SJan Schmidt 3740d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3741745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3742745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3743740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3744d7728c96SJan Schmidt } 3745d7728c96SJan Schmidt 3746718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3747718dc5faSOmar Sandoval ipath->fspath, size); 3748d7728c96SJan Schmidt if (ret) { 3749d7728c96SJan Schmidt ret = -EFAULT; 3750d7728c96SJan Schmidt goto out; 3751d7728c96SJan Schmidt } 3752d7728c96SJan Schmidt 3753d7728c96SJan Schmidt out: 3754d7728c96SJan Schmidt btrfs_free_path(path); 3755d7728c96SJan Schmidt free_ipath(ipath); 3756d7728c96SJan Schmidt kfree(ipa); 3757d7728c96SJan Schmidt 3758d7728c96SJan Schmidt return ret; 3759d7728c96SJan Schmidt } 3760d7728c96SJan Schmidt 3761d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3762d7728c96SJan Schmidt { 3763d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3764d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3765d7728c96SJan Schmidt 3766d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3767d7728c96SJan Schmidt inodes->bytes_left -= c; 3768d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3769d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3770d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3771d7728c96SJan Schmidt inodes->elem_cnt += 3; 3772d7728c96SJan Schmidt } else { 3773d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3774d7728c96SJan Schmidt inodes->bytes_left = 0; 3775d7728c96SJan Schmidt inodes->elem_missed += 3; 3776d7728c96SJan Schmidt } 3777d7728c96SJan Schmidt 3778d7728c96SJan Schmidt return 0; 3779d7728c96SJan Schmidt } 3780d7728c96SJan Schmidt 37812ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3782d24a67b2SZygo Blaxell void __user *arg, int version) 3783d7728c96SJan Schmidt { 3784d7728c96SJan Schmidt int ret = 0; 3785d7728c96SJan Schmidt int size; 3786d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3787d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3788d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3789d24a67b2SZygo Blaxell bool ignore_offset; 3790d7728c96SJan Schmidt 3791d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3792d7728c96SJan Schmidt return -EPERM; 3793d7728c96SJan Schmidt 3794d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 37957b9ea627SShailendra Verma if (IS_ERR(loi)) 37967b9ea627SShailendra Verma return PTR_ERR(loi); 3797d7728c96SJan Schmidt 3798d24a67b2SZygo Blaxell if (version == 1) { 3799d24a67b2SZygo Blaxell ignore_offset = false; 3800b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3801d24a67b2SZygo Blaxell } else { 3802d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3803d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3804d24a67b2SZygo Blaxell ret = -EINVAL; 3805d24a67b2SZygo Blaxell goto out_loi; 3806d24a67b2SZygo Blaxell } 3807d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3808d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3809d24a67b2SZygo Blaxell ret = -EINVAL; 3810d24a67b2SZygo Blaxell goto out_loi; 3811d24a67b2SZygo Blaxell } 3812d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3813b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3814d24a67b2SZygo Blaxell } 3815d24a67b2SZygo Blaxell 3816d7728c96SJan Schmidt path = btrfs_alloc_path(); 3817d7728c96SJan Schmidt if (!path) { 3818d7728c96SJan Schmidt ret = -ENOMEM; 3819d7728c96SJan Schmidt goto out; 3820d7728c96SJan Schmidt } 3821d7728c96SJan Schmidt 3822d7728c96SJan Schmidt inodes = init_data_container(size); 3823d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3824d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3825d7728c96SJan Schmidt inodes = NULL; 3826d7728c96SJan Schmidt goto out; 3827d7728c96SJan Schmidt } 3828d7728c96SJan Schmidt 38292ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3830d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3831df031f07SLiu Bo if (ret == -EINVAL) 3832d7728c96SJan Schmidt ret = -ENOENT; 3833d7728c96SJan Schmidt if (ret < 0) 3834d7728c96SJan Schmidt goto out; 3835d7728c96SJan Schmidt 3836718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3837718dc5faSOmar Sandoval size); 3838d7728c96SJan Schmidt if (ret) 3839d7728c96SJan Schmidt ret = -EFAULT; 3840d7728c96SJan Schmidt 3841d7728c96SJan Schmidt out: 3842d7728c96SJan Schmidt btrfs_free_path(path); 3843f54de068SDavid Sterba kvfree(inodes); 3844d24a67b2SZygo Blaxell out_loi: 3845d7728c96SJan Schmidt kfree(loi); 3846d7728c96SJan Schmidt 3847d7728c96SJan Schmidt return ret; 3848d7728c96SJan Schmidt } 3849d7728c96SJan Schmidt 3850008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3851c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3852c9e9f97bSIlya Dryomov { 3853c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3854c9e9f97bSIlya Dryomov 3855c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3856c9e9f97bSIlya Dryomov 38573009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3858837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3859837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3860837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3861a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3862a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3863837d5b6eSIlya Dryomov 3864c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3865c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3866c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 386719a39dceSIlya Dryomov 386819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 386919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 387019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3871c9e9f97bSIlya Dryomov } 3872c9e9f97bSIlya Dryomov 38739ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3874c9e9f97bSIlya Dryomov { 3875496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3876c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3877c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3878c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3879ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3880c9e9f97bSIlya Dryomov int ret; 3881c9e9f97bSIlya Dryomov 3882c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3883c9e9f97bSIlya Dryomov return -EPERM; 3884c9e9f97bSIlya Dryomov 3885e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38869ba1f6e4SLiu Bo if (ret) 38879ba1f6e4SLiu Bo return ret; 38889ba1f6e4SLiu Bo 3889ed0fb78fSIlya Dryomov again: 3890171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3891c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3892ed0fb78fSIlya Dryomov need_unlock = true; 3893ed0fb78fSIlya Dryomov goto locked; 3894ed0fb78fSIlya Dryomov } 3895ed0fb78fSIlya Dryomov 3896ed0fb78fSIlya Dryomov /* 389701327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3898ed0fb78fSIlya Dryomov * (1) some other op is running 3899ed0fb78fSIlya Dryomov * (2) balance is running 3900ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3901ed0fb78fSIlya Dryomov */ 3902ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3903ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3904ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39053009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3906ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3907dccdb07bSDavid Sterba /* 3908dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3909dccdb07bSDavid Sterba * we'll reexamine the status again. 3910dccdb07bSDavid Sterba */ 3911ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3912ed0fb78fSIlya Dryomov 3913ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39143009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3915ed0fb78fSIlya Dryomov /* this is (3) */ 3916ed0fb78fSIlya Dryomov need_unlock = false; 3917ed0fb78fSIlya Dryomov goto locked; 3918ed0fb78fSIlya Dryomov } 3919ed0fb78fSIlya Dryomov 3920ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3921ed0fb78fSIlya Dryomov goto again; 3922ed0fb78fSIlya Dryomov } else { 3923ed0fb78fSIlya Dryomov /* this is (2) */ 3924ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3925ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3926ed0fb78fSIlya Dryomov goto out; 3927ed0fb78fSIlya Dryomov } 3928ed0fb78fSIlya Dryomov } else { 3929ed0fb78fSIlya Dryomov /* this is (1) */ 3930ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3931e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3932ed0fb78fSIlya Dryomov goto out; 3933ed0fb78fSIlya Dryomov } 3934ed0fb78fSIlya Dryomov 3935ed0fb78fSIlya Dryomov locked: 3936171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 3937c9e9f97bSIlya Dryomov 3938c9e9f97bSIlya Dryomov if (arg) { 3939c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3940c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3941c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3942ed0fb78fSIlya Dryomov goto out_unlock; 3943c9e9f97bSIlya Dryomov } 3944de322263SIlya Dryomov 3945de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3946de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3947de322263SIlya Dryomov ret = -ENOTCONN; 3948de322263SIlya Dryomov goto out_bargs; 3949de322263SIlya Dryomov } 3950de322263SIlya Dryomov 3951de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3952de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3953de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3954de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3955de322263SIlya Dryomov 3956de322263SIlya Dryomov goto do_balance; 3957de322263SIlya Dryomov } 3958c9e9f97bSIlya Dryomov } else { 3959c9e9f97bSIlya Dryomov bargs = NULL; 3960c9e9f97bSIlya Dryomov } 3961c9e9f97bSIlya Dryomov 3962ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3963837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3964837d5b6eSIlya Dryomov goto out_bargs; 3965837d5b6eSIlya Dryomov } 3966837d5b6eSIlya Dryomov 39678d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3968c9e9f97bSIlya Dryomov if (!bctl) { 3969c9e9f97bSIlya Dryomov ret = -ENOMEM; 3970c9e9f97bSIlya Dryomov goto out_bargs; 3971c9e9f97bSIlya Dryomov } 3972c9e9f97bSIlya Dryomov 3973c9e9f97bSIlya Dryomov if (arg) { 3974c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3975c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3976c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3977c9e9f97bSIlya Dryomov 3978c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3979f43ffb60SIlya Dryomov } else { 3980f43ffb60SIlya Dryomov /* balance everything - no filters */ 3981f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3982c9e9f97bSIlya Dryomov } 3983c9e9f97bSIlya Dryomov 39848eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 39858eb93459SDavid Sterba ret = -EINVAL; 39860f89abf5SChristian Engelmayer goto out_bctl; 39878eb93459SDavid Sterba } 39888eb93459SDavid Sterba 3989de322263SIlya Dryomov do_balance: 3990c9e9f97bSIlya Dryomov /* 3991149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 3992149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 3993149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 3994149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 3995c9e9f97bSIlya Dryomov */ 3996ed0fb78fSIlya Dryomov need_unlock = false; 3997ed0fb78fSIlya Dryomov 39986fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 39990f89abf5SChristian Engelmayer bctl = NULL; 4000ed0fb78fSIlya Dryomov 4001d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4002c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4003c9e9f97bSIlya Dryomov ret = -EFAULT; 4004c9e9f97bSIlya Dryomov } 4005c9e9f97bSIlya Dryomov 40060f89abf5SChristian Engelmayer out_bctl: 40070f89abf5SChristian Engelmayer kfree(bctl); 4008c9e9f97bSIlya Dryomov out_bargs: 4009c9e9f97bSIlya Dryomov kfree(bargs); 4010ed0fb78fSIlya Dryomov out_unlock: 4011c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4012ed0fb78fSIlya Dryomov if (need_unlock) 4013171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4014ed0fb78fSIlya Dryomov out: 4015e54bfa31SLiu Bo mnt_drop_write_file(file); 4016c9e9f97bSIlya Dryomov return ret; 4017c9e9f97bSIlya Dryomov } 4018c9e9f97bSIlya Dryomov 40192ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4020837d5b6eSIlya Dryomov { 4021837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4022837d5b6eSIlya Dryomov return -EPERM; 4023837d5b6eSIlya Dryomov 4024837d5b6eSIlya Dryomov switch (cmd) { 4025837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40260b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4027a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40280b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4029837d5b6eSIlya Dryomov } 4030837d5b6eSIlya Dryomov 4031837d5b6eSIlya Dryomov return -EINVAL; 4032837d5b6eSIlya Dryomov } 4033837d5b6eSIlya Dryomov 40342ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 403519a39dceSIlya Dryomov void __user *arg) 403619a39dceSIlya Dryomov { 403719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 403819a39dceSIlya Dryomov int ret = 0; 403919a39dceSIlya Dryomov 404019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 404119a39dceSIlya Dryomov return -EPERM; 404219a39dceSIlya Dryomov 404319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 404419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 404519a39dceSIlya Dryomov ret = -ENOTCONN; 404619a39dceSIlya Dryomov goto out; 404719a39dceSIlya Dryomov } 404819a39dceSIlya Dryomov 40498d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 405019a39dceSIlya Dryomov if (!bargs) { 405119a39dceSIlya Dryomov ret = -ENOMEM; 405219a39dceSIlya Dryomov goto out; 405319a39dceSIlya Dryomov } 405419a39dceSIlya Dryomov 4055008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 405619a39dceSIlya Dryomov 405719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 405819a39dceSIlya Dryomov ret = -EFAULT; 405919a39dceSIlya Dryomov 406019a39dceSIlya Dryomov kfree(bargs); 406119a39dceSIlya Dryomov out: 406219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 406319a39dceSIlya Dryomov return ret; 406419a39dceSIlya Dryomov } 406519a39dceSIlya Dryomov 4066905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40675d13a37bSArne Jansen { 40680b246afaSJeff Mahoney struct inode *inode = file_inode(file); 40690b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 40705d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40715d13a37bSArne Jansen int ret; 40725d13a37bSArne Jansen 40735d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40745d13a37bSArne Jansen return -EPERM; 40755d13a37bSArne Jansen 4076905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4077905b0ddaSMiao Xie if (ret) 4078905b0ddaSMiao Xie return ret; 40795d13a37bSArne Jansen 40805d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4081905b0ddaSMiao Xie if (IS_ERR(sa)) { 4082905b0ddaSMiao Xie ret = PTR_ERR(sa); 4083905b0ddaSMiao Xie goto drop_write; 4084905b0ddaSMiao Xie } 40855d13a37bSArne Jansen 40860b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 40875d13a37bSArne Jansen 40885d13a37bSArne Jansen switch (sa->cmd) { 40895d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4090340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 40915d13a37bSArne Jansen break; 40925d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4093340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 40945d13a37bSArne Jansen break; 40955d13a37bSArne Jansen default: 40965d13a37bSArne Jansen ret = -EINVAL; 40975d13a37bSArne Jansen break; 40985d13a37bSArne Jansen } 40995d13a37bSArne Jansen 41005d13a37bSArne Jansen kfree(sa); 41010b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4102905b0ddaSMiao Xie drop_write: 4103905b0ddaSMiao Xie mnt_drop_write_file(file); 41045d13a37bSArne Jansen return ret; 41055d13a37bSArne Jansen } 41065d13a37bSArne Jansen 4107905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41085d13a37bSArne Jansen { 41090b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41110b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41125d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41135d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41145d13a37bSArne Jansen int ret; 41155d13a37bSArne Jansen int err; 41165d13a37bSArne Jansen 41175d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41185d13a37bSArne Jansen return -EPERM; 41195d13a37bSArne Jansen 4120905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4121905b0ddaSMiao Xie if (ret) 4122905b0ddaSMiao Xie return ret; 41235d13a37bSArne Jansen 41245d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4125905b0ddaSMiao Xie if (IS_ERR(sa)) { 4126905b0ddaSMiao Xie ret = PTR_ERR(sa); 4127905b0ddaSMiao Xie goto drop_write; 4128905b0ddaSMiao Xie } 41295d13a37bSArne Jansen 41305d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41315d13a37bSArne Jansen if (IS_ERR(trans)) { 41325d13a37bSArne Jansen ret = PTR_ERR(trans); 41335d13a37bSArne Jansen goto out; 41345d13a37bSArne Jansen } 41355d13a37bSArne Jansen 41365d13a37bSArne Jansen if (sa->assign) { 41379f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 41385d13a37bSArne Jansen } else { 413939616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 41405d13a37bSArne Jansen } 41415d13a37bSArne Jansen 4142e082f563SQu Wenruo /* update qgroup status and info */ 4143280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4144e082f563SQu Wenruo if (err < 0) 41450b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4146ad8403dfSAnand Jain "failed to update qgroup status and info"); 41473a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41485d13a37bSArne Jansen if (err && !ret) 41495d13a37bSArne Jansen ret = err; 41505d13a37bSArne Jansen 41515d13a37bSArne Jansen out: 41525d13a37bSArne Jansen kfree(sa); 4153905b0ddaSMiao Xie drop_write: 4154905b0ddaSMiao Xie mnt_drop_write_file(file); 41555d13a37bSArne Jansen return ret; 41565d13a37bSArne Jansen } 41575d13a37bSArne Jansen 4158905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41595d13a37bSArne Jansen { 41600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41610b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41625d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41635d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41645d13a37bSArne Jansen int ret; 41655d13a37bSArne Jansen int err; 41665d13a37bSArne Jansen 41675d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41685d13a37bSArne Jansen return -EPERM; 41695d13a37bSArne Jansen 4170905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4171905b0ddaSMiao Xie if (ret) 4172905b0ddaSMiao Xie return ret; 41735d13a37bSArne Jansen 41745d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4175905b0ddaSMiao Xie if (IS_ERR(sa)) { 4176905b0ddaSMiao Xie ret = PTR_ERR(sa); 4177905b0ddaSMiao Xie goto drop_write; 4178905b0ddaSMiao Xie } 41795d13a37bSArne Jansen 4180d86e56cfSMiao Xie if (!sa->qgroupid) { 4181d86e56cfSMiao Xie ret = -EINVAL; 4182d86e56cfSMiao Xie goto out; 4183d86e56cfSMiao Xie } 4184d86e56cfSMiao Xie 41855d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41865d13a37bSArne Jansen if (IS_ERR(trans)) { 41875d13a37bSArne Jansen ret = PTR_ERR(trans); 41885d13a37bSArne Jansen goto out; 41895d13a37bSArne Jansen } 41905d13a37bSArne Jansen 41915d13a37bSArne Jansen if (sa->create) { 419249a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 41935d13a37bSArne Jansen } else { 41943efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 41955d13a37bSArne Jansen } 41965d13a37bSArne Jansen 41973a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41985d13a37bSArne Jansen if (err && !ret) 41995d13a37bSArne Jansen ret = err; 42005d13a37bSArne Jansen 42015d13a37bSArne Jansen out: 42025d13a37bSArne Jansen kfree(sa); 4203905b0ddaSMiao Xie drop_write: 4204905b0ddaSMiao Xie mnt_drop_write_file(file); 42055d13a37bSArne Jansen return ret; 42065d13a37bSArne Jansen } 42075d13a37bSArne Jansen 4208905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42095d13a37bSArne Jansen { 42100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42110b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42125d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42135d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42145d13a37bSArne Jansen int ret; 42155d13a37bSArne Jansen int err; 42165d13a37bSArne Jansen u64 qgroupid; 42175d13a37bSArne Jansen 42185d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42195d13a37bSArne Jansen return -EPERM; 42205d13a37bSArne Jansen 4221905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4222905b0ddaSMiao Xie if (ret) 4223905b0ddaSMiao Xie return ret; 42245d13a37bSArne Jansen 42255d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4226905b0ddaSMiao Xie if (IS_ERR(sa)) { 4227905b0ddaSMiao Xie ret = PTR_ERR(sa); 4228905b0ddaSMiao Xie goto drop_write; 4229905b0ddaSMiao Xie } 42305d13a37bSArne Jansen 42315d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42325d13a37bSArne Jansen if (IS_ERR(trans)) { 42335d13a37bSArne Jansen ret = PTR_ERR(trans); 42345d13a37bSArne Jansen goto out; 42355d13a37bSArne Jansen } 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen qgroupid = sa->qgroupid; 42385d13a37bSArne Jansen if (!qgroupid) { 42395d13a37bSArne Jansen /* take the current subvol as qgroup */ 42405d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42415d13a37bSArne Jansen } 42425d13a37bSArne Jansen 4243f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 42445d13a37bSArne Jansen 42453a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42465d13a37bSArne Jansen if (err && !ret) 42475d13a37bSArne Jansen ret = err; 42485d13a37bSArne Jansen 42495d13a37bSArne Jansen out: 42505d13a37bSArne Jansen kfree(sa); 4251905b0ddaSMiao Xie drop_write: 4252905b0ddaSMiao Xie mnt_drop_write_file(file); 42535d13a37bSArne Jansen return ret; 42545d13a37bSArne Jansen } 42555d13a37bSArne Jansen 42562f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42572f232036SJan Schmidt { 42580b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42602f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42612f232036SJan Schmidt int ret; 42622f232036SJan Schmidt 42632f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42642f232036SJan Schmidt return -EPERM; 42652f232036SJan Schmidt 42662f232036SJan Schmidt ret = mnt_want_write_file(file); 42672f232036SJan Schmidt if (ret) 42682f232036SJan Schmidt return ret; 42692f232036SJan Schmidt 42702f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42712f232036SJan Schmidt if (IS_ERR(qsa)) { 42722f232036SJan Schmidt ret = PTR_ERR(qsa); 42732f232036SJan Schmidt goto drop_write; 42742f232036SJan Schmidt } 42752f232036SJan Schmidt 42762f232036SJan Schmidt if (qsa->flags) { 42772f232036SJan Schmidt ret = -EINVAL; 42782f232036SJan Schmidt goto out; 42792f232036SJan Schmidt } 42802f232036SJan Schmidt 42810b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 42822f232036SJan Schmidt 42832f232036SJan Schmidt out: 42842f232036SJan Schmidt kfree(qsa); 42852f232036SJan Schmidt drop_write: 42862f232036SJan Schmidt mnt_drop_write_file(file); 42872f232036SJan Schmidt return ret; 42882f232036SJan Schmidt } 42892f232036SJan Schmidt 4290b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4291b929c1d8SMarcos Paulo de Souza void __user *arg) 42922f232036SJan Schmidt { 42932f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42942f232036SJan Schmidt int ret = 0; 42952f232036SJan Schmidt 42962f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42972f232036SJan Schmidt return -EPERM; 42982f232036SJan Schmidt 42998d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43002f232036SJan Schmidt if (!qsa) 43012f232036SJan Schmidt return -ENOMEM; 43022f232036SJan Schmidt 43030b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43042f232036SJan Schmidt qsa->flags = 1; 43050b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43062f232036SJan Schmidt } 43072f232036SJan Schmidt 43082f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43092f232036SJan Schmidt ret = -EFAULT; 43102f232036SJan Schmidt 43112f232036SJan Schmidt kfree(qsa); 43122f232036SJan Schmidt return ret; 43132f232036SJan Schmidt } 43142f232036SJan Schmidt 4315b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4316b929c1d8SMarcos Paulo de Souza void __user *arg) 431757254b6eSJan Schmidt { 431857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 431957254b6eSJan Schmidt return -EPERM; 432057254b6eSJan Schmidt 43210b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 432257254b6eSJan Schmidt } 432357254b6eSJan Schmidt 4324abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4325abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43268ea05e3aSAlexander Block { 4327496ad9aaSAl Viro struct inode *inode = file_inode(file); 43280b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43298ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43308ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43318ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 433295582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43338ea05e3aSAlexander Block int ret = 0; 4334dd5f9615SStefan Behrens int received_uuid_changed; 43358ea05e3aSAlexander Block 4336bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4337bd60ea0fSDavid Sterba return -EPERM; 4338bd60ea0fSDavid Sterba 43398ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43408ea05e3aSAlexander Block if (ret < 0) 43418ea05e3aSAlexander Block return ret; 43428ea05e3aSAlexander Block 43430b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43448ea05e3aSAlexander Block 43454a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 43468ea05e3aSAlexander Block ret = -EINVAL; 43478ea05e3aSAlexander Block goto out; 43488ea05e3aSAlexander Block } 43498ea05e3aSAlexander Block 43508ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43518ea05e3aSAlexander Block ret = -EROFS; 43528ea05e3aSAlexander Block goto out; 43538ea05e3aSAlexander Block } 43548ea05e3aSAlexander Block 4355dd5f9615SStefan Behrens /* 4356dd5f9615SStefan Behrens * 1 - root item 4357dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4358dd5f9615SStefan Behrens */ 4359dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43608ea05e3aSAlexander Block if (IS_ERR(trans)) { 43618ea05e3aSAlexander Block ret = PTR_ERR(trans); 43628ea05e3aSAlexander Block trans = NULL; 43638ea05e3aSAlexander Block goto out; 43648ea05e3aSAlexander Block } 43658ea05e3aSAlexander Block 43668ea05e3aSAlexander Block sa->rtransid = trans->transid; 43678ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43688ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43698ea05e3aSAlexander Block 4370dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4371dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4372dd5f9615SStefan Behrens if (received_uuid_changed && 4373d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4374d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4375dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4376dd5f9615SStefan Behrens root->root_key.objectid); 4377d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4378d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4379d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4380d87ff758SNikolay Borisov goto out; 4381d87ff758SNikolay Borisov } 4382d87ff758SNikolay Borisov } 43838ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43848ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43858ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43863cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43873cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 43883cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 43893cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 43908ea05e3aSAlexander Block 43910b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 43928ea05e3aSAlexander Block &root->root_key, &root->root_item); 43938ea05e3aSAlexander Block if (ret < 0) { 43943a45bb20SJeff Mahoney btrfs_end_transaction(trans); 43958ea05e3aSAlexander Block goto out; 4396dd5f9615SStefan Behrens } 4397dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4398cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4399dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4400dd5f9615SStefan Behrens root->root_key.objectid); 4401dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 440266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4403efd38150SNikolay Borisov btrfs_end_transaction(trans); 4404dd5f9615SStefan Behrens goto out; 4405dd5f9615SStefan Behrens } 4406dd5f9615SStefan Behrens } 44073a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4408abccd00fSHugo Mills out: 44090b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4410abccd00fSHugo Mills mnt_drop_write_file(file); 4411abccd00fSHugo Mills return ret; 4412abccd00fSHugo Mills } 4413abccd00fSHugo Mills 4414abccd00fSHugo Mills #ifdef CONFIG_64BIT 4415abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4416abccd00fSHugo Mills void __user *arg) 4417abccd00fSHugo Mills { 4418abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4419abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4420abccd00fSHugo Mills int ret = 0; 4421abccd00fSHugo Mills 4422abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44237b9ea627SShailendra Verma if (IS_ERR(args32)) 44247b9ea627SShailendra Verma return PTR_ERR(args32); 4425abccd00fSHugo Mills 44268d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 442784dbeb87SDan Carpenter if (!args64) { 442884dbeb87SDan Carpenter ret = -ENOMEM; 4429abccd00fSHugo Mills goto out; 4430abccd00fSHugo Mills } 4431abccd00fSHugo Mills 4432abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4433abccd00fSHugo Mills args64->stransid = args32->stransid; 4434abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4435abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4436abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4437abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4438abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4439abccd00fSHugo Mills args64->flags = args32->flags; 4440abccd00fSHugo Mills 4441abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4442abccd00fSHugo Mills if (ret) 4443abccd00fSHugo Mills goto out; 4444abccd00fSHugo Mills 4445abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4446abccd00fSHugo Mills args32->stransid = args64->stransid; 4447abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4448abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4449abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4450abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4451abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4452abccd00fSHugo Mills args32->flags = args64->flags; 4453abccd00fSHugo Mills 4454abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4455abccd00fSHugo Mills if (ret) 4456abccd00fSHugo Mills ret = -EFAULT; 4457abccd00fSHugo Mills 4458abccd00fSHugo Mills out: 4459abccd00fSHugo Mills kfree(args32); 4460abccd00fSHugo Mills kfree(args64); 4461abccd00fSHugo Mills return ret; 4462abccd00fSHugo Mills } 4463abccd00fSHugo Mills #endif 4464abccd00fSHugo Mills 4465abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4466abccd00fSHugo Mills void __user *arg) 4467abccd00fSHugo Mills { 4468abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4469abccd00fSHugo Mills int ret = 0; 4470abccd00fSHugo Mills 4471abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 44727b9ea627SShailendra Verma if (IS_ERR(sa)) 44737b9ea627SShailendra Verma return PTR_ERR(sa); 4474abccd00fSHugo Mills 4475abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4476abccd00fSHugo Mills 4477abccd00fSHugo Mills if (ret) 4478abccd00fSHugo Mills goto out; 4479abccd00fSHugo Mills 44808ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44818ea05e3aSAlexander Block if (ret) 44828ea05e3aSAlexander Block ret = -EFAULT; 44838ea05e3aSAlexander Block 44848ea05e3aSAlexander Block out: 44858ea05e3aSAlexander Block kfree(sa); 44868ea05e3aSAlexander Block return ret; 44878ea05e3aSAlexander Block } 44888ea05e3aSAlexander Block 4489b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4490b929c1d8SMarcos Paulo de Souza void __user *arg) 4491867ab667Sjeff.liu { 4492a1b83ac5SAnand Jain size_t len; 4493867ab667Sjeff.liu int ret; 4494a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4495a1b83ac5SAnand Jain 44960b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 44970b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 44980b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4499a1b83ac5SAnand Jain 4500a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4501867ab667Sjeff.liu 4502867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45030b246afaSJeff Mahoney btrfs_warn(fs_info, 45040b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45050b246afaSJeff Mahoney --len); 4506867ab667Sjeff.liu } 4507867ab667Sjeff.liu 4508867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4509867ab667Sjeff.liu 4510867ab667Sjeff.liu return ret ? -EFAULT : 0; 4511867ab667Sjeff.liu } 4512867ab667Sjeff.liu 4513a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4514a8bfd4abSjeff.liu { 45150b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45170b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45180b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4519a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4520a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4521a8bfd4abSjeff.liu int ret; 4522a8bfd4abSjeff.liu 4523a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4524a8bfd4abSjeff.liu return -EPERM; 4525a8bfd4abSjeff.liu 4526a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4527a8bfd4abSjeff.liu return -EFAULT; 4528a8bfd4abSjeff.liu 4529a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45300b246afaSJeff Mahoney btrfs_err(fs_info, 45315d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4532a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4533a8bfd4abSjeff.liu return -EINVAL; 4534a8bfd4abSjeff.liu } 4535a8bfd4abSjeff.liu 4536a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4537a8bfd4abSjeff.liu if (ret) 4538a8bfd4abSjeff.liu return ret; 4539a8bfd4abSjeff.liu 4540a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4541a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4542a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4543a8bfd4abSjeff.liu goto out_unlock; 4544a8bfd4abSjeff.liu } 4545a8bfd4abSjeff.liu 45460b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4547a8bfd4abSjeff.liu strcpy(super_block->label, label); 45480b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 45493a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4550a8bfd4abSjeff.liu 4551a8bfd4abSjeff.liu out_unlock: 4552a8bfd4abSjeff.liu mnt_drop_write_file(file); 4553a8bfd4abSjeff.liu return ret; 4554a8bfd4abSjeff.liu } 4555a8bfd4abSjeff.liu 45562eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45572eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45582eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45592eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45602eaa055fSJeff Mahoney 4561d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 45622eaa055fSJeff Mahoney { 45634d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 45642eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 45652eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 45662eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 45672eaa055fSJeff Mahoney }; 45682eaa055fSJeff Mahoney 45692eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45702eaa055fSJeff Mahoney return -EFAULT; 45712eaa055fSJeff Mahoney 45722eaa055fSJeff Mahoney return 0; 45732eaa055fSJeff Mahoney } 45742eaa055fSJeff Mahoney 4575b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4576b929c1d8SMarcos Paulo de Souza void __user *arg) 45772eaa055fSJeff Mahoney { 45780b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 45792eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 45802eaa055fSJeff Mahoney 45812eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 45822eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 45832eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 45842eaa055fSJeff Mahoney 45852eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45862eaa055fSJeff Mahoney return -EFAULT; 45872eaa055fSJeff Mahoney 45882eaa055fSJeff Mahoney return 0; 45892eaa055fSJeff Mahoney } 45902eaa055fSJeff Mahoney 45912ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 45923b02a68aSJeff Mahoney enum btrfs_feature_set set, 45932eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 45942eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 45952eaa055fSJeff Mahoney { 4596f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 45973b02a68aSJeff Mahoney char *names; 45982eaa055fSJeff Mahoney u64 disallowed, unsupported; 45992eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46002eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46012eaa055fSJeff Mahoney 46022eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46032eaa055fSJeff Mahoney if (unsupported) { 46043b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46053b02a68aSJeff Mahoney if (names) { 46060b246afaSJeff Mahoney btrfs_warn(fs_info, 46073b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46083b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46093b02a68aSJeff Mahoney kfree(names); 46103b02a68aSJeff Mahoney } else 46110b246afaSJeff Mahoney btrfs_warn(fs_info, 46122eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46132eaa055fSJeff Mahoney type, unsupported); 46142eaa055fSJeff Mahoney return -EOPNOTSUPP; 46152eaa055fSJeff Mahoney } 46162eaa055fSJeff Mahoney 46172eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46182eaa055fSJeff Mahoney if (disallowed) { 46193b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46203b02a68aSJeff Mahoney if (names) { 46210b246afaSJeff Mahoney btrfs_warn(fs_info, 46223b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46233b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46243b02a68aSJeff Mahoney kfree(names); 46253b02a68aSJeff Mahoney } else 46260b246afaSJeff Mahoney btrfs_warn(fs_info, 46272eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46282eaa055fSJeff Mahoney type, disallowed); 46292eaa055fSJeff Mahoney return -EPERM; 46302eaa055fSJeff Mahoney } 46312eaa055fSJeff Mahoney 46322eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46332eaa055fSJeff Mahoney if (disallowed) { 46343b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46353b02a68aSJeff Mahoney if (names) { 46360b246afaSJeff Mahoney btrfs_warn(fs_info, 46373b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46383b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46393b02a68aSJeff Mahoney kfree(names); 46403b02a68aSJeff Mahoney } else 46410b246afaSJeff Mahoney btrfs_warn(fs_info, 46422eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46432eaa055fSJeff Mahoney type, disallowed); 46442eaa055fSJeff Mahoney return -EPERM; 46452eaa055fSJeff Mahoney } 46462eaa055fSJeff Mahoney 46472eaa055fSJeff Mahoney return 0; 46482eaa055fSJeff Mahoney } 46492eaa055fSJeff Mahoney 46502ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 46512ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 46522eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46532eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46542eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46552eaa055fSJeff Mahoney 46562eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46572eaa055fSJeff Mahoney { 46580b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46600b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46610b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46622eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46632eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 46642eaa055fSJeff Mahoney u64 newflags; 46652eaa055fSJeff Mahoney int ret; 46662eaa055fSJeff Mahoney 46672eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 46682eaa055fSJeff Mahoney return -EPERM; 46692eaa055fSJeff Mahoney 46702eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 46712eaa055fSJeff Mahoney return -EFAULT; 46722eaa055fSJeff Mahoney 46732eaa055fSJeff Mahoney /* Nothing to do */ 46742eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 46752eaa055fSJeff Mahoney !flags[0].incompat_flags) 46762eaa055fSJeff Mahoney return 0; 46772eaa055fSJeff Mahoney 46782ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 46792eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 46802eaa055fSJeff Mahoney if (ret) 46812eaa055fSJeff Mahoney return ret; 46822eaa055fSJeff Mahoney 46832ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 46842eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 46852eaa055fSJeff Mahoney if (ret) 46862eaa055fSJeff Mahoney return ret; 46872eaa055fSJeff Mahoney 46882ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 46892eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 46902eaa055fSJeff Mahoney if (ret) 46912eaa055fSJeff Mahoney return ret; 46922eaa055fSJeff Mahoney 46937ab19625SDavid Sterba ret = mnt_want_write_file(file); 46947ab19625SDavid Sterba if (ret) 46957ab19625SDavid Sterba return ret; 46967ab19625SDavid Sterba 46978051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 46987ab19625SDavid Sterba if (IS_ERR(trans)) { 46997ab19625SDavid Sterba ret = PTR_ERR(trans); 47007ab19625SDavid Sterba goto out_drop_write; 47017ab19625SDavid Sterba } 47022eaa055fSJeff Mahoney 47030b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47042eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47052eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47062eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47072eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47082eaa055fSJeff Mahoney 47092eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47102eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47112eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47122eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47132eaa055fSJeff Mahoney 47142eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47152eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47162eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47172eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47180b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47192eaa055fSJeff Mahoney 47203a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47217ab19625SDavid Sterba out_drop_write: 47227ab19625SDavid Sterba mnt_drop_write_file(file); 47237ab19625SDavid Sterba 47247ab19625SDavid Sterba return ret; 47252eaa055fSJeff Mahoney } 47262eaa055fSJeff Mahoney 47272351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47282351f431SJosef Bacik { 47292351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47302351f431SJosef Bacik int ret; 47312351f431SJosef Bacik 47322351f431SJosef Bacik if (compat) { 47332351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47342351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47352351f431SJosef Bacik 47362351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 47372351f431SJosef Bacik if (ret) 47382351f431SJosef Bacik return -EFAULT; 47392351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 47402351f431SJosef Bacik if (!arg) 47412351f431SJosef Bacik return -ENOMEM; 47422351f431SJosef Bacik arg->send_fd = args32.send_fd; 47432351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 47442351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 47452351f431SJosef Bacik arg->parent_root = args32.parent_root; 47462351f431SJosef Bacik arg->flags = args32.flags; 47472351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 47482351f431SJosef Bacik sizeof(args32.reserved)); 47492351f431SJosef Bacik #else 47502351f431SJosef Bacik return -ENOTTY; 47512351f431SJosef Bacik #endif 47522351f431SJosef Bacik } else { 47532351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 47542351f431SJosef Bacik if (IS_ERR(arg)) 47552351f431SJosef Bacik return PTR_ERR(arg); 47562351f431SJosef Bacik } 47572351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 47582351f431SJosef Bacik kfree(arg); 47592351f431SJosef Bacik return ret; 47602351f431SJosef Bacik } 47612351f431SJosef Bacik 4762f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4763f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4764f46b5a66SChristoph Hellwig { 47650b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47660b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47670b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47684bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4769f46b5a66SChristoph Hellwig 4770f46b5a66SChristoph Hellwig switch (cmd) { 47716cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 47726cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 47736cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 47746cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 47756cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 47766cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 477740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4778b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 477940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 478040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4781f7039b1dSLi Dongyang case FITRIM: 4782b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4783f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4784fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4785fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4786fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 47873de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4788fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 47896f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 47906f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 479176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4792949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4793949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4794949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 47950caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 47960caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 47970caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 47980caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 47996ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48006ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4801f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48021e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48031e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48041e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4805f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4806198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4807f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48082ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4809f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4810da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48116b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48126b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4813475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48142ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4815475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48162ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4817f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48189ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4819ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4820ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4821cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4822cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4823ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4824ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4825d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4826d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4827d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4828d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4829d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4830d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48311406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48322ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48339b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48349b199859SFilipe David Borba Manana int ret; 48359b199859SFilipe David Borba Manana 483682b3e53bSNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, -1); 48379b199859SFilipe David Borba Manana if (ret) 48389b199859SFilipe David Borba Manana return ret; 48390b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 48402fad4e83SDavid Sterba /* 48412fad4e83SDavid Sterba * The transaction thread may want to do more work, 484201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 48432fad4e83SDavid Sterba * processing uncleaned subvols. 48442fad4e83SDavid Sterba */ 48450b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 48469b199859SFilipe David Borba Manana return ret; 48479b199859SFilipe David Borba Manana } 484846204592SSage Weil case BTRFS_IOC_START_SYNC: 48499a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 485046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48512ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4852475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4853b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4854475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 48552ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4856475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 48572ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4858c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48599ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4860837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 48612ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 486219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 48632ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 48648ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48658ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4866abccd00fSHugo Mills #ifdef CONFIG_64BIT 4867abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4868abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4869abccd00fSHugo Mills #endif 487031db9f7cSAlexander Block case BTRFS_IOC_SEND: 48712351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 48722351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48732351f431SJosef Bacik case BTRFS_IOC_SEND_32: 48742351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 48752351f431SJosef Bacik #endif 4876c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 48772ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 48785d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4879905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 48805d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4881905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 48825d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4883905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 48845d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4885905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 48862f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 48872f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 48882f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4889b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 489057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4891b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 48923f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 48932ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 48942eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4895d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 48962eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4897b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 48982eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 48992eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4900e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4901e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4902025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4903025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4904b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4905b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 490642e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 490742e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 490823d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 490923d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4910f46b5a66SChristoph Hellwig } 4911f46b5a66SChristoph Hellwig 4912f46b5a66SChristoph Hellwig return -ENOTTY; 4913f46b5a66SChristoph Hellwig } 49144c63c245SLuke Dashjr 49154c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49164c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49174c63c245SLuke Dashjr { 49182a362249SJeff Mahoney /* 49192a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49202a362249SJeff Mahoney * handling is necessary. 49212a362249SJeff Mahoney */ 49224c63c245SLuke Dashjr switch (cmd) { 49234c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49244c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49254c63c245SLuke Dashjr break; 49264c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49274c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49284c63c245SLuke Dashjr break; 49294c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49304c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49314c63c245SLuke Dashjr break; 49324c63c245SLuke Dashjr } 49334c63c245SLuke Dashjr 49344c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49354c63c245SLuke Dashjr } 49364c63c245SLuke Dashjr #endif 4937