Commit | Line | Data |
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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f46b5a66 CH |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
f46b5a66 CH |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/bio.h> | |
f46b5a66 CH |
8 | #include <linux/file.h> |
9 | #include <linux/fs.h> | |
cb8e7090 | 10 | #include <linux/fsnotify.h> |
f46b5a66 CH |
11 | #include <linux/pagemap.h> |
12 | #include <linux/highmem.h> | |
13 | #include <linux/time.h> | |
f46b5a66 | 14 | #include <linux/string.h> |
f46b5a66 | 15 | #include <linux/backing-dev.h> |
cb8e7090 | 16 | #include <linux/mount.h> |
cb8e7090 | 17 | #include <linux/namei.h> |
f46b5a66 | 18 | #include <linux/writeback.h> |
f46b5a66 | 19 | #include <linux/compat.h> |
cb8e7090 | 20 | #include <linux/security.h> |
f46b5a66 | 21 | #include <linux/xattr.h> |
f54de068 | 22 | #include <linux/mm.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
f7039b1d | 24 | #include <linux/blkdev.h> |
8ea05e3a | 25 | #include <linux/uuid.h> |
55e301fd | 26 | #include <linux/btrfs.h> |
416161db | 27 | #include <linux/uaccess.h> |
ae5e165d | 28 | #include <linux/iversion.h> |
97fc2977 | 29 | #include <linux/fileattr.h> |
14605409 | 30 | #include <linux/fsverity.h> |
1881fba8 | 31 | #include <linux/sched/xacct.h> |
f46b5a66 CH |
32 | #include "ctree.h" |
33 | #include "disk-io.h" | |
949964c9 | 34 | #include "export.h" |
f46b5a66 CH |
35 | #include "transaction.h" |
36 | #include "btrfs_inode.h" | |
f46b5a66 | 37 | #include "volumes.h" |
925baedd | 38 | #include "locking.h" |
d7728c96 | 39 | #include "backref.h" |
31db9f7c | 40 | #include "send.h" |
3f6bcfbd | 41 | #include "dev-replace.h" |
63541927 | 42 | #include "props.h" |
3b02a68a | 43 | #include "sysfs.h" |
fcebe456 | 44 | #include "qgroup.h" |
1ec9a1ae | 45 | #include "tree-log.h" |
ebb8765b | 46 | #include "compression.h" |
8719aaae | 47 | #include "space-info.h" |
aac0023c | 48 | #include "block-group.h" |
c7f13d42 | 49 | #include "fs.h" |
07e81dc9 | 50 | #include "accessors.h" |
a0231804 | 51 | #include "extent-tree.h" |
45c40c8f | 52 | #include "root-tree.h" |
59b818e0 | 53 | #include "defrag.h" |
f2b39277 | 54 | #include "dir-item.h" |
c7a03b52 | 55 | #include "uuid-tree.h" |
7572dec8 | 56 | #include "ioctl.h" |
af142b6f | 57 | #include "file.h" |
2fc6822c | 58 | #include "scrub.h" |
c03b2207 | 59 | #include "super.h" |
f46b5a66 | 60 | |
abccd00f HM |
61 | #ifdef CONFIG_64BIT |
62 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
63 | * structures are incorrect, as the timespec structure from userspace | |
64 | * is 4 bytes too small. We define these alternatives here to teach | |
65 | * the kernel about the 32-bit struct packing. | |
66 | */ | |
67 | struct btrfs_ioctl_timespec_32 { | |
68 | __u64 sec; | |
69 | __u32 nsec; | |
70 | } __attribute__ ((__packed__)); | |
71 | ||
72 | struct btrfs_ioctl_received_subvol_args_32 { | |
73 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
74 | __u64 stransid; /* in */ | |
75 | __u64 rtransid; /* out */ | |
76 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
77 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
78 | __u64 flags; /* in */ | |
79 | __u64 reserved[16]; /* in */ | |
80 | } __attribute__ ((__packed__)); | |
81 | ||
82 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
83 | struct btrfs_ioctl_received_subvol_args_32) | |
84 | #endif | |
85 | ||
2351f431 JB |
86 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
87 | struct btrfs_ioctl_send_args_32 { | |
88 | __s64 send_fd; /* in */ | |
89 | __u64 clone_sources_count; /* in */ | |
90 | compat_uptr_t clone_sources; /* in */ | |
91 | __u64 parent_root; /* in */ | |
92 | __u64 flags; /* in */ | |
e77fbf99 DS |
93 | __u32 version; /* in */ |
94 | __u8 reserved[28]; /* in */ | |
2351f431 JB |
95 | } __attribute__ ((__packed__)); |
96 | ||
97 | #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ | |
98 | struct btrfs_ioctl_send_args_32) | |
1881fba8 OS |
99 | |
100 | struct btrfs_ioctl_encoded_io_args_32 { | |
101 | compat_uptr_t iov; | |
102 | compat_ulong_t iovcnt; | |
103 | __s64 offset; | |
104 | __u64 flags; | |
105 | __u64 len; | |
106 | __u64 unencoded_len; | |
107 | __u64 unencoded_offset; | |
108 | __u32 compression; | |
109 | __u32 encryption; | |
110 | __u8 reserved[64]; | |
111 | }; | |
112 | ||
113 | #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ | |
114 | struct btrfs_ioctl_encoded_io_args_32) | |
7c0c7269 OS |
115 | #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ |
116 | struct btrfs_ioctl_encoded_io_args_32) | |
2351f431 | 117 | #endif |
abccd00f | 118 | |
6cbff00f | 119 | /* Mask out flags that are inappropriate for the given type of inode. */ |
1905a0f7 DS |
120 | static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, |
121 | unsigned int flags) | |
6cbff00f | 122 | { |
1905a0f7 | 123 | if (S_ISDIR(inode->i_mode)) |
6cbff00f | 124 | return flags; |
1905a0f7 | 125 | else if (S_ISREG(inode->i_mode)) |
6cbff00f CH |
126 | return flags & ~FS_DIRSYNC_FL; |
127 | else | |
128 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
129 | } | |
130 | ||
131 | /* | |
a157d4fd DS |
132 | * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS |
133 | * ioctl. | |
6cbff00f | 134 | */ |
77eea05e | 135 | static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) |
6cbff00f CH |
136 | { |
137 | unsigned int iflags = 0; | |
77eea05e | 138 | u32 flags = binode->flags; |
14605409 | 139 | u32 ro_flags = binode->ro_flags; |
6cbff00f CH |
140 | |
141 | if (flags & BTRFS_INODE_SYNC) | |
142 | iflags |= FS_SYNC_FL; | |
143 | if (flags & BTRFS_INODE_IMMUTABLE) | |
144 | iflags |= FS_IMMUTABLE_FL; | |
145 | if (flags & BTRFS_INODE_APPEND) | |
146 | iflags |= FS_APPEND_FL; | |
147 | if (flags & BTRFS_INODE_NODUMP) | |
148 | iflags |= FS_NODUMP_FL; | |
149 | if (flags & BTRFS_INODE_NOATIME) | |
150 | iflags |= FS_NOATIME_FL; | |
151 | if (flags & BTRFS_INODE_DIRSYNC) | |
152 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
153 | if (flags & BTRFS_INODE_NODATACOW) |
154 | iflags |= FS_NOCOW_FL; | |
14605409 BB |
155 | if (ro_flags & BTRFS_INODE_RO_VERITY) |
156 | iflags |= FS_VERITY_FL; | |
d0092bdd | 157 | |
13f48dc9 | 158 | if (flags & BTRFS_INODE_NOCOMPRESS) |
d0092bdd | 159 | iflags |= FS_NOCOMP_FL; |
13f48dc9 ST |
160 | else if (flags & BTRFS_INODE_COMPRESS) |
161 | iflags |= FS_COMPR_FL; | |
6cbff00f CH |
162 | |
163 | return iflags; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Update inode->i_flags based on the btrfs internal flags. | |
168 | */ | |
7b6a221e | 169 | void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) |
6cbff00f | 170 | { |
5c57b8b6 | 171 | struct btrfs_inode *binode = BTRFS_I(inode); |
3cc79392 | 172 | unsigned int new_fl = 0; |
6cbff00f | 173 | |
5c57b8b6 | 174 | if (binode->flags & BTRFS_INODE_SYNC) |
3cc79392 | 175 | new_fl |= S_SYNC; |
5c57b8b6 | 176 | if (binode->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 177 | new_fl |= S_IMMUTABLE; |
5c57b8b6 | 178 | if (binode->flags & BTRFS_INODE_APPEND) |
3cc79392 | 179 | new_fl |= S_APPEND; |
5c57b8b6 | 180 | if (binode->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 181 | new_fl |= S_NOATIME; |
5c57b8b6 | 182 | if (binode->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 | 183 | new_fl |= S_DIRSYNC; |
14605409 BB |
184 | if (binode->ro_flags & BTRFS_INODE_RO_VERITY) |
185 | new_fl |= S_VERITY; | |
3cc79392 FM |
186 | |
187 | set_mask_bits(&inode->i_flags, | |
14605409 BB |
188 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | |
189 | S_VERITY, new_fl); | |
6cbff00f CH |
190 | } |
191 | ||
f37c563b DS |
192 | /* |
193 | * Check if @flags are a supported and valid set of FS_*_FL flags and that | |
194 | * the old and new flags are not conflicting | |
195 | */ | |
196 | static int check_fsflags(unsigned int old_flags, unsigned int flags) | |
75e7cb7f LB |
197 | { |
198 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
199 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
200 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
201 | FS_NOCOMP_FL | FS_COMPR_FL | |
202 | FS_NOCOW_FL)) | |
75e7cb7f LB |
203 | return -EOPNOTSUPP; |
204 | ||
f37c563b | 205 | /* COMPR and NOCOMP on new/old are valid */ |
75e7cb7f LB |
206 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
207 | return -EINVAL; | |
208 | ||
f37c563b DS |
209 | if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) |
210 | return -EINVAL; | |
211 | ||
212 | /* NOCOW and compression options are mutually exclusive */ | |
213 | if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
214 | return -EINVAL; | |
215 | if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
216 | return -EINVAL; | |
217 | ||
75e7cb7f LB |
218 | return 0; |
219 | } | |
220 | ||
d206e9c9 NA |
221 | static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, |
222 | unsigned int flags) | |
223 | { | |
224 | if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) | |
225 | return -EPERM; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
5ab2b180 DS |
230 | int btrfs_check_ioctl_vol_args_path(const struct btrfs_ioctl_vol_args *vol_args) |
231 | { | |
232 | if (memchr(vol_args->name, 0, sizeof(vol_args->name)) == NULL) | |
233 | return -ENAMETOOLONG; | |
234 | return 0; | |
235 | } | |
236 | ||
0478adff DS |
237 | static int btrfs_check_ioctl_vol_args2_subvol_name(const struct btrfs_ioctl_vol_args_v2 *vol_args2) |
238 | { | |
239 | if (memchr(vol_args2->name, 0, sizeof(vol_args2->name)) == NULL) | |
240 | return -ENAMETOOLONG; | |
241 | return 0; | |
242 | } | |
243 | ||
97fc2977 MS |
244 | /* |
245 | * Set flags/xflags from the internal inode flags. The remaining items of | |
246 | * fsxattr are zeroed. | |
247 | */ | |
248 | int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) | |
6cbff00f | 249 | { |
97fc2977 MS |
250 | struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); |
251 | ||
77eea05e | 252 | fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); |
97fc2977 MS |
253 | return 0; |
254 | } | |
255 | ||
8782a9ae | 256 | int btrfs_fileattr_set(struct mnt_idmap *idmap, |
97fc2977 MS |
257 | struct dentry *dentry, struct fileattr *fa) |
258 | { | |
259 | struct inode *inode = d_inode(dentry); | |
41044b41 | 260 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
5c57b8b6 DS |
261 | struct btrfs_inode *binode = BTRFS_I(inode); |
262 | struct btrfs_root *root = binode->root; | |
6cbff00f | 263 | struct btrfs_trans_handle *trans; |
5aca2842 | 264 | unsigned int fsflags, old_fsflags; |
6cbff00f | 265 | int ret; |
ff9fef55 | 266 | const char *comp = NULL; |
f37c563b | 267 | u32 binode_flags; |
6cbff00f | 268 | |
b83cc969 LZ |
269 | if (btrfs_root_readonly(root)) |
270 | return -EROFS; | |
271 | ||
97fc2977 MS |
272 | if (fileattr_has_fsx(fa)) |
273 | return -EOPNOTSUPP; | |
e7848683 | 274 | |
97fc2977 | 275 | fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); |
77eea05e | 276 | old_fsflags = btrfs_inode_flags_to_fsflags(binode); |
f37c563b DS |
277 | ret = check_fsflags(old_fsflags, fsflags); |
278 | if (ret) | |
97fc2977 | 279 | return ret; |
f37c563b | 280 | |
d206e9c9 NA |
281 | ret = check_fsflags_compatible(fs_info, fsflags); |
282 | if (ret) | |
97fc2977 | 283 | return ret; |
d206e9c9 | 284 | |
f37c563b | 285 | binode_flags = binode->flags; |
5c57b8b6 | 286 | if (fsflags & FS_SYNC_FL) |
d2b8fcfe | 287 | binode_flags |= BTRFS_INODE_SYNC; |
6cbff00f | 288 | else |
d2b8fcfe | 289 | binode_flags &= ~BTRFS_INODE_SYNC; |
5c57b8b6 | 290 | if (fsflags & FS_IMMUTABLE_FL) |
d2b8fcfe | 291 | binode_flags |= BTRFS_INODE_IMMUTABLE; |
6cbff00f | 292 | else |
d2b8fcfe | 293 | binode_flags &= ~BTRFS_INODE_IMMUTABLE; |
5c57b8b6 | 294 | if (fsflags & FS_APPEND_FL) |
d2b8fcfe | 295 | binode_flags |= BTRFS_INODE_APPEND; |
6cbff00f | 296 | else |
d2b8fcfe | 297 | binode_flags &= ~BTRFS_INODE_APPEND; |
5c57b8b6 | 298 | if (fsflags & FS_NODUMP_FL) |
d2b8fcfe | 299 | binode_flags |= BTRFS_INODE_NODUMP; |
6cbff00f | 300 | else |
d2b8fcfe | 301 | binode_flags &= ~BTRFS_INODE_NODUMP; |
5c57b8b6 | 302 | if (fsflags & FS_NOATIME_FL) |
d2b8fcfe | 303 | binode_flags |= BTRFS_INODE_NOATIME; |
6cbff00f | 304 | else |
d2b8fcfe | 305 | binode_flags &= ~BTRFS_INODE_NOATIME; |
97fc2977 MS |
306 | |
307 | /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ | |
308 | if (!fa->flags_valid) { | |
309 | /* 1 item for the inode */ | |
310 | trans = btrfs_start_transaction(root, 1); | |
9b8a233b RH |
311 | if (IS_ERR(trans)) |
312 | return PTR_ERR(trans); | |
97fc2977 MS |
313 | goto update_flags; |
314 | } | |
315 | ||
5c57b8b6 | 316 | if (fsflags & FS_DIRSYNC_FL) |
d2b8fcfe | 317 | binode_flags |= BTRFS_INODE_DIRSYNC; |
6cbff00f | 318 | else |
d2b8fcfe | 319 | binode_flags &= ~BTRFS_INODE_DIRSYNC; |
5c57b8b6 | 320 | if (fsflags & FS_NOCOW_FL) { |
44e5194b | 321 | if (S_ISREG(inode->i_mode)) { |
7e97b8da DS |
322 | /* |
323 | * It's safe to turn csums off here, no extents exist. | |
324 | * Otherwise we want the flag to reflect the real COW | |
325 | * status of the file and will not set it. | |
326 | */ | |
327 | if (inode->i_size == 0) | |
d2b8fcfe AJ |
328 | binode_flags |= BTRFS_INODE_NODATACOW | |
329 | BTRFS_INODE_NODATASUM; | |
7e97b8da | 330 | } else { |
d2b8fcfe | 331 | binode_flags |= BTRFS_INODE_NODATACOW; |
7e97b8da DS |
332 | } |
333 | } else { | |
334 | /* | |
01327610 | 335 | * Revert back under same assumptions as above |
7e97b8da | 336 | */ |
44e5194b | 337 | if (S_ISREG(inode->i_mode)) { |
7e97b8da | 338 | if (inode->i_size == 0) |
d2b8fcfe AJ |
339 | binode_flags &= ~(BTRFS_INODE_NODATACOW | |
340 | BTRFS_INODE_NODATASUM); | |
7e97b8da | 341 | } else { |
d2b8fcfe | 342 | binode_flags &= ~BTRFS_INODE_NODATACOW; |
7e97b8da DS |
343 | } |
344 | } | |
6cbff00f | 345 | |
75e7cb7f LB |
346 | /* |
347 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
348 | * flag may be changed automatically if compression code won't make | |
349 | * things smaller. | |
350 | */ | |
5c57b8b6 | 351 | if (fsflags & FS_NOCOMP_FL) { |
d2b8fcfe AJ |
352 | binode_flags &= ~BTRFS_INODE_COMPRESS; |
353 | binode_flags |= BTRFS_INODE_NOCOMPRESS; | |
5c57b8b6 | 354 | } else if (fsflags & FS_COMPR_FL) { |
63541927 | 355 | |
97fc2977 MS |
356 | if (IS_SWAPFILE(inode)) |
357 | return -ETXTBSY; | |
eede2bf3 | 358 | |
d2b8fcfe AJ |
359 | binode_flags |= BTRFS_INODE_COMPRESS; |
360 | binode_flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 | 361 | |
93370509 DS |
362 | comp = btrfs_compress_type2str(fs_info->compress_type); |
363 | if (!comp || comp[0] == 0) | |
364 | comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); | |
ebcb904d | 365 | } else { |
d2b8fcfe | 366 | binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 367 | } |
6cbff00f | 368 | |
ff9fef55 AJ |
369 | /* |
370 | * 1 for inode item | |
371 | * 2 for properties | |
372 | */ | |
373 | trans = btrfs_start_transaction(root, 3); | |
97fc2977 MS |
374 | if (IS_ERR(trans)) |
375 | return PTR_ERR(trans); | |
6cbff00f | 376 | |
ff9fef55 AJ |
377 | if (comp) { |
378 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, | |
379 | strlen(comp), 0); | |
380 | if (ret) { | |
381 | btrfs_abort_transaction(trans, ret); | |
382 | goto out_end_trans; | |
383 | } | |
ff9fef55 AJ |
384 | } else { |
385 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, | |
386 | 0, 0); | |
387 | if (ret && ret != -ENODATA) { | |
388 | btrfs_abort_transaction(trans, ret); | |
389 | goto out_end_trans; | |
390 | } | |
391 | } | |
392 | ||
97fc2977 | 393 | update_flags: |
d2b8fcfe | 394 | binode->flags = binode_flags; |
7b6a221e | 395 | btrfs_sync_inode_flags_to_i_flags(inode); |
0c4d2d95 | 396 | inode_inc_iversion(inode); |
2a9462de | 397 | inode_set_ctime_current(inode); |
8b9d0322 | 398 | ret = btrfs_update_inode(trans, BTRFS_I(inode)); |
6cbff00f | 399 | |
ff9fef55 | 400 | out_end_trans: |
3a45bb20 | 401 | btrfs_end_transaction(trans); |
2d4e6f6a | 402 | return ret; |
6cbff00f CH |
403 | } |
404 | ||
0d7ed32c DS |
405 | /* |
406 | * Start exclusive operation @type, return true on success | |
407 | */ | |
c3e1f96c GR |
408 | bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, |
409 | enum btrfs_exclusive_operation type) | |
410 | { | |
0d7ed32c DS |
411 | bool ret = false; |
412 | ||
413 | spin_lock(&fs_info->super_lock); | |
414 | if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { | |
415 | fs_info->exclusive_operation = type; | |
416 | ret = true; | |
417 | } | |
418 | spin_unlock(&fs_info->super_lock); | |
419 | ||
420 | return ret; | |
c3e1f96c GR |
421 | } |
422 | ||
578bda9e DS |
423 | /* |
424 | * Conditionally allow to enter the exclusive operation in case it's compatible | |
425 | * with the running one. This must be paired with btrfs_exclop_start_unlock and | |
426 | * btrfs_exclop_finish. | |
427 | * | |
428 | * Compatibility: | |
429 | * - the same type is already running | |
621a1ee1 | 430 | * - when trying to add a device and balance has been paused |
578bda9e DS |
431 | * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller |
432 | * must check the condition first that would allow none -> @type | |
433 | */ | |
434 | bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, | |
435 | enum btrfs_exclusive_operation type) | |
436 | { | |
437 | spin_lock(&fs_info->super_lock); | |
621a1ee1 NB |
438 | if (fs_info->exclusive_operation == type || |
439 | (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && | |
440 | type == BTRFS_EXCLOP_DEV_ADD)) | |
578bda9e DS |
441 | return true; |
442 | ||
443 | spin_unlock(&fs_info->super_lock); | |
444 | return false; | |
445 | } | |
446 | ||
447 | void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) | |
448 | { | |
449 | spin_unlock(&fs_info->super_lock); | |
450 | } | |
451 | ||
c3e1f96c GR |
452 | void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) |
453 | { | |
0d7ed32c | 454 | spin_lock(&fs_info->super_lock); |
c3e1f96c | 455 | WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); |
0d7ed32c | 456 | spin_unlock(&fs_info->super_lock); |
66a2823c | 457 | sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); |
c3e1f96c GR |
458 | } |
459 | ||
efc0e69c NB |
460 | void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, |
461 | enum btrfs_exclusive_operation op) | |
462 | { | |
463 | switch (op) { | |
464 | case BTRFS_EXCLOP_BALANCE_PAUSED: | |
465 | spin_lock(&fs_info->super_lock); | |
466 | ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || | |
ac868bc9 | 467 | fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD || |
468 | fs_info->exclusive_operation == BTRFS_EXCLOP_NONE || | |
469 | fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); | |
efc0e69c NB |
470 | fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; |
471 | spin_unlock(&fs_info->super_lock); | |
472 | break; | |
473 | case BTRFS_EXCLOP_BALANCE: | |
474 | spin_lock(&fs_info->super_lock); | |
475 | ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); | |
476 | fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; | |
477 | spin_unlock(&fs_info->super_lock); | |
478 | break; | |
479 | default: | |
480 | btrfs_warn(fs_info, | |
481 | "invalid exclop balance operation %d requested", op); | |
482 | } | |
483 | } | |
484 | ||
dc408ccd | 485 | static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) |
6cbff00f | 486 | { |
6cbff00f CH |
487 | return put_user(inode->i_generation, arg); |
488 | } | |
f46b5a66 | 489 | |
b929c1d8 MPS |
490 | static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, |
491 | void __user *arg) | |
f7039b1d | 492 | { |
f7039b1d | 493 | struct btrfs_device *device; |
f7039b1d LD |
494 | struct fstrim_range range; |
495 | u64 minlen = ULLONG_MAX; | |
496 | u64 num_devices = 0; | |
497 | int ret; | |
498 | ||
499 | if (!capable(CAP_SYS_ADMIN)) | |
500 | return -EPERM; | |
501 | ||
1cb3dc3f NA |
502 | /* |
503 | * btrfs_trim_block_group() depends on space cache, which is not | |
504 | * available in zoned filesystem. So, disallow fitrim on a zoned | |
505 | * filesystem for now. | |
506 | */ | |
507 | if (btrfs_is_zoned(fs_info)) | |
508 | return -EOPNOTSUPP; | |
509 | ||
f35f06c3 FM |
510 | /* |
511 | * If the fs is mounted with nologreplay, which requires it to be | |
512 | * mounted in RO mode as well, we can not allow discard on free space | |
513 | * inside block groups, because log trees refer to extents that are not | |
514 | * pinned in a block group's free space cache (pinning the extents is | |
515 | * precisely the first phase of replaying a log tree). | |
516 | */ | |
517 | if (btrfs_test_opt(fs_info, NOLOGREPLAY)) | |
518 | return -EROFS; | |
519 | ||
1f78160c XG |
520 | rcu_read_lock(); |
521 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
522 | dev_list) { | |
7b47ef52 | 523 | if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) |
f7039b1d | 524 | continue; |
7b47ef52 CH |
525 | num_devices++; |
526 | minlen = min_t(u64, bdev_discard_granularity(device->bdev), | |
527 | minlen); | |
f7039b1d | 528 | } |
1f78160c | 529 | rcu_read_unlock(); |
f4c697e6 | 530 | |
f7039b1d LD |
531 | if (!num_devices) |
532 | return -EOPNOTSUPP; | |
f7039b1d LD |
533 | if (copy_from_user(&range, arg, sizeof(range))) |
534 | return -EFAULT; | |
6ba9fc8e QW |
535 | |
536 | /* | |
537 | * NOTE: Don't truncate the range using super->total_bytes. Bytenr of | |
538 | * block group is in the logical address space, which can be any | |
539 | * sectorsize aligned bytenr in the range [0, U64_MAX]. | |
540 | */ | |
4e00422e | 541 | if (range.len < fs_info->sectorsize) |
f4c697e6 | 542 | return -EINVAL; |
f7039b1d LD |
543 | |
544 | range.minlen = max(range.minlen, minlen); | |
2ff7e61e | 545 | ret = btrfs_trim_fs(fs_info, &range); |
f7039b1d LD |
546 | if (ret < 0) |
547 | return ret; | |
548 | ||
549 | if (copy_to_user(arg, &range, sizeof(range))) | |
550 | return -EFAULT; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
e1f60a65 | 555 | int __pure btrfs_is_empty_uuid(u8 *uuid) |
dd5f9615 | 556 | { |
46e0f66a CM |
557 | int i; |
558 | ||
559 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
560 | if (uuid[i]) | |
561 | return 0; | |
562 | } | |
563 | return 1; | |
dd5f9615 SB |
564 | } |
565 | ||
3538d68d OS |
566 | /* |
567 | * Calculate the number of transaction items to reserve for creating a subvolume | |
568 | * or snapshot, not including the inode, directory entries, or parent directory. | |
569 | */ | |
570 | static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) | |
571 | { | |
572 | /* | |
573 | * 1 to add root block | |
574 | * 1 to add root item | |
575 | * 1 to add root ref | |
576 | * 1 to add root backref | |
577 | * 1 to add UUID item | |
578 | * 1 to add qgroup info | |
579 | * 1 to add qgroup limit | |
580 | * | |
581 | * Ideally the last two would only be accounted if qgroups are enabled, | |
582 | * but that can change between now and the time we would insert them. | |
583 | */ | |
584 | unsigned int num_items = 7; | |
585 | ||
586 | if (inherit) { | |
587 | /* 2 to add qgroup relations for each inherited qgroup */ | |
588 | num_items += 2 * inherit->num_qgroups; | |
589 | } | |
590 | return num_items; | |
591 | } | |
592 | ||
f2d40141 | 593 | static noinline int create_subvol(struct mnt_idmap *idmap, |
4d4340c9 | 594 | struct inode *dir, struct dentry *dentry, |
8696c533 | 595 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 596 | { |
41044b41 | 597 | struct btrfs_fs_info *fs_info = inode_to_fs_info(dir); |
f46b5a66 CH |
598 | struct btrfs_trans_handle *trans; |
599 | struct btrfs_key key; | |
49a3c4d9 | 600 | struct btrfs_root_item *root_item; |
f46b5a66 CH |
601 | struct btrfs_inode_item *inode_item; |
602 | struct extent_buffer *leaf; | |
d5c12070 | 603 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 604 | struct btrfs_root *new_root; |
d5c12070 | 605 | struct btrfs_block_rsv block_rsv; |
95582b00 | 606 | struct timespec64 cur_time = current_time(dir); |
3538d68d OS |
607 | struct btrfs_new_inode_args new_inode_args = { |
608 | .dir = dir, | |
609 | .dentry = dentry, | |
610 | .subvol = true, | |
611 | }; | |
612 | unsigned int trans_num_items; | |
f46b5a66 | 613 | int ret; |
2256e901 | 614 | dev_t anon_dev; |
f46b5a66 | 615 | u64 objectid; |
74e97958 | 616 | u64 qgroup_reserved = 0; |
f46b5a66 | 617 | |
49a3c4d9 DS |
618 | root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); |
619 | if (!root_item) | |
620 | return -ENOMEM; | |
621 | ||
543068a2 | 622 | ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); |
2fbe8c8a | 623 | if (ret) |
2256e901 | 624 | goto out_root_item; |
2dfb1e43 | 625 | |
e09fe2d2 QW |
626 | /* |
627 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
01327610 | 628 | * screwed up since it assumes subvolume qgroup's level to be 0. |
e09fe2d2 | 629 | */ |
49a3c4d9 DS |
630 | if (btrfs_qgroup_level(objectid)) { |
631 | ret = -ENOSPC; | |
2256e901 | 632 | goto out_root_item; |
49a3c4d9 | 633 | } |
e09fe2d2 | 634 | |
2256e901 OS |
635 | ret = get_anon_bdev(&anon_dev); |
636 | if (ret < 0) | |
637 | goto out_root_item; | |
638 | ||
f2d40141 | 639 | new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir); |
3538d68d | 640 | if (!new_inode_args.inode) { |
a1fd0c35 OS |
641 | ret = -ENOMEM; |
642 | goto out_anon_dev; | |
643 | } | |
3538d68d OS |
644 | ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); |
645 | if (ret) | |
646 | goto out_inode; | |
647 | trans_num_items += create_subvol_num_items(inherit); | |
a1fd0c35 | 648 | |
d5c12070 | 649 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
3538d68d OS |
650 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
651 | trans_num_items, false); | |
d5c12070 | 652 | if (ret) |
3538d68d | 653 | goto out_new_inode_args; |
74e97958 | 654 | qgroup_reserved = block_rsv.qgroup_rsv_reserved; |
d5c12070 MX |
655 | |
656 | trans = btrfs_start_transaction(root, 0); | |
657 | if (IS_ERR(trans)) { | |
658 | ret = PTR_ERR(trans); | |
74e97958 | 659 | goto out_release_rsv; |
d5c12070 | 660 | } |
74e97958 BB |
661 | ret = btrfs_record_root_in_trans(trans, BTRFS_I(dir)->root); |
662 | if (ret) | |
663 | goto out; | |
664 | btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved); | |
665 | qgroup_reserved = 0; | |
d5c12070 MX |
666 | trans->block_rsv = &block_rsv; |
667 | trans->bytes_reserved = block_rsv.size; | |
1b53e51a STD |
668 | /* Tree log can't currently deal with an inode which is a new root. */ |
669 | btrfs_set_log_full_commit(trans); | |
f46b5a66 | 670 | |
e094f480 | 671 | ret = btrfs_qgroup_inherit(trans, 0, objectid, btrfs_root_id(root), inherit); |
6f72c7e2 | 672 | if (ret) |
2256e901 | 673 | goto out; |
6f72c7e2 | 674 | |
9631e4cc | 675 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, |
60ea105a | 676 | 0, BTRFS_NESTING_NORMAL); |
8e8a1e31 JB |
677 | if (IS_ERR(leaf)) { |
678 | ret = PTR_ERR(leaf); | |
2256e901 | 679 | goto out; |
8e8a1e31 | 680 | } |
f46b5a66 | 681 | |
50564b65 | 682 | btrfs_mark_buffer_dirty(trans, leaf); |
f46b5a66 | 683 | |
49a3c4d9 | 684 | inode_item = &root_item->inode; |
3cae210f QW |
685 | btrfs_set_stack_inode_generation(inode_item, 1); |
686 | btrfs_set_stack_inode_size(inode_item, 3); | |
687 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
da17066c | 688 | btrfs_set_stack_inode_nbytes(inode_item, |
0b246afa | 689 | fs_info->nodesize); |
3cae210f | 690 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 691 | |
49a3c4d9 DS |
692 | btrfs_set_root_flags(root_item, 0); |
693 | btrfs_set_root_limit(root_item, 0); | |
3cae210f | 694 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
08fe4db1 | 695 | |
49a3c4d9 DS |
696 | btrfs_set_root_bytenr(root_item, leaf->start); |
697 | btrfs_set_root_generation(root_item, trans->transid); | |
698 | btrfs_set_root_level(root_item, 0); | |
699 | btrfs_set_root_refs(root_item, 1); | |
700 | btrfs_set_root_used(root_item, leaf->len); | |
701 | btrfs_set_root_last_snapshot(root_item, 0); | |
f46b5a66 | 702 | |
49a3c4d9 DS |
703 | btrfs_set_root_generation_v2(root_item, |
704 | btrfs_root_generation(root_item)); | |
807fc790 | 705 | generate_random_guid(root_item->uuid); |
49a3c4d9 DS |
706 | btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); |
707 | btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); | |
708 | root_item->ctime = root_item->otime; | |
709 | btrfs_set_root_ctransid(root_item, trans->transid); | |
710 | btrfs_set_root_otransid(root_item, trans->transid); | |
f46b5a66 | 711 | |
925baedd | 712 | btrfs_tree_unlock(leaf); |
f46b5a66 | 713 | |
69948022 | 714 | btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); |
f46b5a66 CH |
715 | |
716 | key.objectid = objectid; | |
5d4f98a2 | 717 | key.offset = 0; |
962a298f | 718 | key.type = BTRFS_ROOT_ITEM_KEY; |
0b246afa | 719 | ret = btrfs_insert_root(trans, fs_info->tree_root, &key, |
49a3c4d9 | 720 | root_item); |
67addf29 FM |
721 | if (ret) { |
722 | /* | |
723 | * Since we don't abort the transaction in this case, free the | |
724 | * tree block so that we don't leak space and leave the | |
725 | * filesystem in an inconsistent state (an extent item in the | |
7a163608 | 726 | * extent tree with a backreference for a root that does not |
212a58fd | 727 | * exists). |
67addf29 | 728 | */ |
212a58fd | 729 | btrfs_tree_lock(leaf); |
190a8339 | 730 | btrfs_clear_buffer_dirty(trans, leaf); |
212a58fd | 731 | btrfs_tree_unlock(leaf); |
7a163608 | 732 | btrfs_free_tree_block(trans, objectid, leaf, 0, 1); |
67addf29 | 733 | free_extent_buffer(leaf); |
2256e901 | 734 | goto out; |
67addf29 FM |
735 | } |
736 | ||
737 | free_extent_buffer(leaf); | |
738 | leaf = NULL; | |
f46b5a66 | 739 | |
e2b54eaf | 740 | new_root = btrfs_get_new_fs_root(fs_info, objectid, &anon_dev); |
79787eaa | 741 | if (IS_ERR(new_root)) { |
79787eaa | 742 | ret = PTR_ERR(new_root); |
66642832 | 743 | btrfs_abort_transaction(trans, ret); |
2256e901 | 744 | goto out; |
79787eaa | 745 | } |
2256e901 | 746 | /* anon_dev is owned by new_root now. */ |
2dfb1e43 | 747 | anon_dev = 0; |
3538d68d OS |
748 | BTRFS_I(new_inode_args.inode)->root = new_root; |
749 | /* ... and new_root is owned by new_inode_args.inode now. */ | |
76dda93c | 750 | |
221581e4 JB |
751 | ret = btrfs_record_root_in_trans(trans, new_root); |
752 | if (ret) { | |
66642832 | 753 | btrfs_abort_transaction(trans, ret); |
2256e901 | 754 | goto out; |
79787eaa | 755 | } |
0660b5af | 756 | |
caae78e0 OS |
757 | ret = btrfs_uuid_tree_add(trans, root_item->uuid, |
758 | BTRFS_UUID_KEY_SUBVOL, objectid); | |
c7e54b51 JB |
759 | if (ret) { |
760 | btrfs_abort_transaction(trans, ret); | |
2256e901 | 761 | goto out; |
c7e54b51 | 762 | } |
52c26179 | 763 | |
caae78e0 | 764 | ret = btrfs_create_new_inode(trans, &new_inode_args); |
c7e54b51 JB |
765 | if (ret) { |
766 | btrfs_abort_transaction(trans, ret); | |
2256e901 | 767 | goto out; |
c7e54b51 | 768 | } |
f46b5a66 | 769 | |
caae78e0 OS |
770 | d_instantiate_new(dentry, new_inode_args.inode); |
771 | new_inode_args.inode = NULL; | |
dd5f9615 | 772 | |
2256e901 | 773 | out: |
d5c12070 MX |
774 | trans->block_rsv = NULL; |
775 | trans->bytes_reserved = 0; | |
1b53e51a | 776 | btrfs_end_transaction(trans); |
74e97958 BB |
777 | out_release_rsv: |
778 | btrfs_block_rsv_release(fs_info, &block_rsv, (u64)-1, NULL); | |
779 | if (qgroup_reserved) | |
780 | btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved); | |
3538d68d OS |
781 | out_new_inode_args: |
782 | btrfs_new_inode_args_destroy(&new_inode_args); | |
a1fd0c35 | 783 | out_inode: |
3538d68d | 784 | iput(new_inode_args.inode); |
2256e901 | 785 | out_anon_dev: |
2dfb1e43 QW |
786 | if (anon_dev) |
787 | free_anon_bdev(anon_dev); | |
2256e901 | 788 | out_root_item: |
49a3c4d9 DS |
789 | kfree(root_item); |
790 | return ret; | |
f46b5a66 CH |
791 | } |
792 | ||
e9662f70 | 793 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
9babda9f | 794 | struct dentry *dentry, bool readonly, |
e9662f70 | 795 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 796 | { |
41044b41 | 797 | struct btrfs_fs_info *fs_info = inode_to_fs_info(dir); |
2e4bfab9 | 798 | struct inode *inode; |
f46b5a66 | 799 | struct btrfs_pending_snapshot *pending_snapshot; |
3538d68d | 800 | unsigned int trans_num_items; |
f46b5a66 | 801 | struct btrfs_trans_handle *trans; |
74e97958 BB |
802 | struct btrfs_block_rsv *block_rsv; |
803 | u64 qgroup_reserved = 0; | |
2e4bfab9 | 804 | int ret; |
f46b5a66 | 805 | |
813febdb JB |
806 | /* We do not support snapshotting right now. */ |
807 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { | |
808 | btrfs_warn(fs_info, | |
809 | "extent tree v2 doesn't support snapshotting yet"); | |
810 | return -EOPNOTSUPP; | |
811 | } | |
812 | ||
7081929a OS |
813 | if (btrfs_root_refs(&root->root_item) == 0) |
814 | return -ENOENT; | |
815 | ||
92a7cc42 | 816 | if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) |
f46b5a66 CH |
817 | return -EINVAL; |
818 | ||
eede2bf3 OS |
819 | if (atomic_read(&root->nr_swapfiles)) { |
820 | btrfs_warn(fs_info, | |
821 | "cannot snapshot subvolume with active swapfile"); | |
822 | return -ETXTBSY; | |
823 | } | |
824 | ||
23269bf5 | 825 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); |
a1ee7362 DS |
826 | if (!pending_snapshot) |
827 | return -ENOMEM; | |
828 | ||
2dfb1e43 QW |
829 | ret = get_anon_bdev(&pending_snapshot->anon_dev); |
830 | if (ret < 0) | |
831 | goto free_pending; | |
b0c0ea63 | 832 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
23269bf5 | 833 | GFP_KERNEL); |
8546b570 DS |
834 | pending_snapshot->path = btrfs_alloc_path(); |
835 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
836 | ret = -ENOMEM; |
837 | goto free_pending; | |
838 | } | |
839 | ||
74e97958 BB |
840 | block_rsv = &pending_snapshot->block_rsv; |
841 | btrfs_init_block_rsv(block_rsv, BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 | 842 | /* |
3538d68d OS |
843 | * 1 to add dir item |
844 | * 1 to add dir index | |
845 | * 1 to update parent inode item | |
d5c12070 | 846 | */ |
3538d68d | 847 | trans_num_items = create_subvol_num_items(inherit) + 3; |
74e97958 | 848 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, block_rsv, |
3538d68d | 849 | trans_num_items, false); |
d5c12070 | 850 | if (ret) |
c11fbb6e | 851 | goto free_pending; |
74e97958 | 852 | qgroup_reserved = block_rsv->qgroup_rsv_reserved; |
d5c12070 | 853 | |
3de4586c | 854 | pending_snapshot->dentry = dentry; |
f46b5a66 | 855 | pending_snapshot->root = root; |
b83cc969 | 856 | pending_snapshot->readonly = readonly; |
e9662f70 | 857 | pending_snapshot->dir = dir; |
8696c533 | 858 | pending_snapshot->inherit = inherit; |
a22285a6 | 859 | |
d5c12070 | 860 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
861 | if (IS_ERR(trans)) { |
862 | ret = PTR_ERR(trans); | |
863 | goto fail; | |
864 | } | |
74e97958 BB |
865 | ret = btrfs_record_root_in_trans(trans, BTRFS_I(dir)->root); |
866 | if (ret) { | |
867 | btrfs_end_transaction(trans); | |
868 | goto fail; | |
869 | } | |
870 | btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved); | |
871 | qgroup_reserved = 0; | |
a22285a6 | 872 | |
28b21c55 | 873 | trans->pending_snapshot = pending_snapshot; |
9babda9f NB |
874 | |
875 | ret = btrfs_commit_transaction(trans); | |
aec8030a | 876 | if (ret) |
c37b2b62 | 877 | goto fail; |
a22285a6 YZ |
878 | |
879 | ret = pending_snapshot->error; | |
880 | if (ret) | |
881 | goto fail; | |
882 | ||
d3797308 CM |
883 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
884 | if (ret) | |
885 | goto fail; | |
886 | ||
2b0143b5 | 887 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
888 | if (IS_ERR(inode)) { |
889 | ret = PTR_ERR(inode); | |
890 | goto fail; | |
891 | } | |
5662344b | 892 | |
2e4bfab9 YZ |
893 | d_instantiate(dentry, inode); |
894 | ret = 0; | |
2dfb1e43 | 895 | pending_snapshot->anon_dev = 0; |
2e4bfab9 | 896 | fail: |
2dfb1e43 QW |
897 | /* Prevent double freeing of anon_dev */ |
898 | if (ret && pending_snapshot->snap) | |
899 | pending_snapshot->snap->anon_dev = 0; | |
00246528 | 900 | btrfs_put_root(pending_snapshot->snap); |
74e97958 BB |
901 | btrfs_block_rsv_release(fs_info, block_rsv, (u64)-1, NULL); |
902 | if (qgroup_reserved) | |
903 | btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved); | |
b0c0ea63 | 904 | free_pending: |
2dfb1e43 QW |
905 | if (pending_snapshot->anon_dev) |
906 | free_anon_bdev(pending_snapshot->anon_dev); | |
b0c0ea63 | 907 | kfree(pending_snapshot->root_item); |
8546b570 | 908 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
909 | kfree(pending_snapshot); |
910 | ||
f46b5a66 CH |
911 | return ret; |
912 | } | |
913 | ||
4260f7c7 SW |
914 | /* copy of may_delete in fs/namei.c() |
915 | * Check whether we can remove a link victim from directory dir, check | |
916 | * whether the type of victim is right. | |
917 | * 1. We can't do it if dir is read-only (done in permission()) | |
918 | * 2. We should have write and exec permissions on dir | |
919 | * 3. We can't remove anything from append-only dir | |
920 | * 4. We can't do anything with immutable dir (done in permission()) | |
921 | * 5. If the sticky bit on dir is set we should either | |
922 | * a. be owner of dir, or | |
923 | * b. be owner of victim, or | |
924 | * c. have CAP_FOWNER capability | |
01327610 | 925 | * 6. If the victim is append-only or immutable we can't do anything with |
4260f7c7 SW |
926 | * links pointing to it. |
927 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
928 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
929 | * 9. We can't remove a root or mountpoint. | |
930 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
931 | * nfs_async_unlink(). | |
932 | */ | |
933 | ||
4609e1f1 | 934 | static int btrfs_may_delete(struct mnt_idmap *idmap, |
c4ed533b | 935 | struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
936 | { |
937 | int error; | |
938 | ||
2b0143b5 | 939 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
940 | return -ENOENT; |
941 | ||
16865702 DS |
942 | /* The @victim is not inside @dir. */ |
943 | if (d_inode(victim->d_parent) != dir) | |
944 | return -EINVAL; | |
4fa6b5ec | 945 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 | 946 | |
4609e1f1 | 947 | error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); |
4260f7c7 SW |
948 | if (error) |
949 | return error; | |
950 | if (IS_APPEND(dir)) | |
951 | return -EPERM; | |
9452e93e | 952 | if (check_sticky(idmap, dir, d_inode(victim)) || |
ba73d987 CB |
953 | IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || |
954 | IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
955 | return -EPERM; |
956 | if (isdir) { | |
e36cb0b8 | 957 | if (!d_is_dir(victim)) |
4260f7c7 SW |
958 | return -ENOTDIR; |
959 | if (IS_ROOT(victim)) | |
960 | return -EBUSY; | |
e36cb0b8 | 961 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
962 | return -EISDIR; |
963 | if (IS_DEADDIR(dir)) | |
964 | return -ENOENT; | |
965 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
966 | return -EBUSY; | |
967 | return 0; | |
968 | } | |
969 | ||
cb8e7090 | 970 | /* copy of may_create in fs/namei.c() */ |
4609e1f1 | 971 | static inline int btrfs_may_create(struct mnt_idmap *idmap, |
4d4340c9 | 972 | struct inode *dir, struct dentry *child) |
cb8e7090 | 973 | { |
2b0143b5 | 974 | if (d_really_is_positive(child)) |
cb8e7090 CH |
975 | return -EEXIST; |
976 | if (IS_DEADDIR(dir)) | |
977 | return -ENOENT; | |
4609e1f1 | 978 | if (!fsuidgid_has_mapping(dir->i_sb, idmap)) |
5474bf40 | 979 | return -EOVERFLOW; |
4609e1f1 | 980 | return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); |
cb8e7090 CH |
981 | } |
982 | ||
983 | /* | |
984 | * Create a new subvolume below @parent. This is largely modeled after | |
985 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
986 | * inside this filesystem so it's quite a bit simpler. | |
987 | */ | |
92872094 | 988 | static noinline int btrfs_mksubvol(const struct path *parent, |
4609e1f1 | 989 | struct mnt_idmap *idmap, |
52f75f4f | 990 | const char *name, int namelen, |
72fd032e | 991 | struct btrfs_root *snap_src, |
9babda9f | 992 | bool readonly, |
8696c533 | 993 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 994 | { |
0b246afa | 995 | struct inode *dir = d_inode(parent->dentry); |
41044b41 | 996 | struct btrfs_fs_info *fs_info = inode_to_fs_info(dir); |
cb8e7090 | 997 | struct dentry *dentry; |
6db75318 | 998 | struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); |
cb8e7090 CH |
999 | int error; |
1000 | ||
00235411 AV |
1001 | error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
1002 | if (error == -EINTR) | |
1003 | return error; | |
cb8e7090 | 1004 | |
4609e1f1 | 1005 | dentry = lookup_one(idmap, name, parent->dentry, namelen); |
cb8e7090 CH |
1006 | error = PTR_ERR(dentry); |
1007 | if (IS_ERR(dentry)) | |
1008 | goto out_unlock; | |
1009 | ||
4609e1f1 | 1010 | error = btrfs_may_create(idmap, dir, dentry); |
cb8e7090 | 1011 | if (error) |
a874a63e | 1012 | goto out_dput; |
cb8e7090 | 1013 | |
9c52057c CM |
1014 | /* |
1015 | * even if this name doesn't exist, we may get hash collisions. | |
1016 | * check for them now when we can safely fail | |
1017 | */ | |
1018 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
e43eec81 | 1019 | dir->i_ino, &name_str); |
9c52057c CM |
1020 | if (error) |
1021 | goto out_dput; | |
1022 | ||
0b246afa | 1023 | down_read(&fs_info->subvol_sem); |
76dda93c YZ |
1024 | |
1025 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
1026 | goto out_up_read; | |
1027 | ||
9babda9f NB |
1028 | if (snap_src) |
1029 | error = create_snapshot(snap_src, dir, dentry, readonly, inherit); | |
1030 | else | |
f2d40141 | 1031 | error = create_subvol(idmap, dir, dentry, inherit); |
9babda9f | 1032 | |
76dda93c YZ |
1033 | if (!error) |
1034 | fsnotify_mkdir(dir, dentry); | |
1035 | out_up_read: | |
0b246afa | 1036 | up_read(&fs_info->subvol_sem); |
cb8e7090 CH |
1037 | out_dput: |
1038 | dput(dentry); | |
1039 | out_unlock: | |
e5d4d75b | 1040 | btrfs_inode_unlock(BTRFS_I(dir), 0); |
cb8e7090 CH |
1041 | return error; |
1042 | } | |
1043 | ||
c11fbb6e | 1044 | static noinline int btrfs_mksnapshot(const struct path *parent, |
4609e1f1 | 1045 | struct mnt_idmap *idmap, |
c11fbb6e RK |
1046 | const char *name, int namelen, |
1047 | struct btrfs_root *root, | |
1048 | bool readonly, | |
1049 | struct btrfs_qgroup_inherit *inherit) | |
1050 | { | |
1051 | int ret; | |
1052 | bool snapshot_force_cow = false; | |
1053 | ||
1054 | /* | |
1055 | * Force new buffered writes to reserve space even when NOCOW is | |
1056 | * possible. This is to avoid later writeback (running dealloc) to | |
1057 | * fallback to COW mode and unexpectedly fail with ENOSPC. | |
1058 | */ | |
1059 | btrfs_drew_read_lock(&root->snapshot_lock); | |
1060 | ||
f9baa501 | 1061 | ret = btrfs_start_delalloc_snapshot(root, false); |
c11fbb6e RK |
1062 | if (ret) |
1063 | goto out; | |
1064 | ||
1065 | /* | |
1066 | * All previous writes have started writeback in NOCOW mode, so now | |
1067 | * we force future writes to fallback to COW mode during snapshot | |
1068 | * creation. | |
1069 | */ | |
1070 | atomic_inc(&root->snapshot_force_cow); | |
1071 | snapshot_force_cow = true; | |
1072 | ||
1073 | btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); | |
1074 | ||
4609e1f1 | 1075 | ret = btrfs_mksubvol(parent, idmap, name, namelen, |
c11fbb6e RK |
1076 | root, readonly, inherit); |
1077 | out: | |
1078 | if (snapshot_force_cow) | |
1079 | atomic_dec(&root->snapshot_force_cow); | |
1080 | btrfs_drew_read_unlock(&root->snapshot_lock); | |
1081 | return ret; | |
1082 | } | |
1083 | ||
17aaa434 DS |
1084 | /* |
1085 | * Try to start exclusive operation @type or cancel it if it's running. | |
1086 | * | |
1087 | * Return: | |
1088 | * 0 - normal mode, newly claimed op started | |
1089 | * >0 - normal mode, something else is running, | |
1090 | * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space | |
1091 | * ECANCELED - cancel mode, successful cancel | |
1092 | * ENOTCONN - cancel mode, operation not running anymore | |
1093 | */ | |
1094 | static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, | |
1095 | enum btrfs_exclusive_operation type, bool cancel) | |
1096 | { | |
1097 | if (!cancel) { | |
1098 | /* Start normal op */ | |
1099 | if (!btrfs_exclop_start(fs_info, type)) | |
1100 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
1101 | /* Exclusive operation is now claimed */ | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /* Cancel running op */ | |
1106 | if (btrfs_exclop_start_try_lock(fs_info, type)) { | |
1107 | /* | |
1108 | * This blocks any exclop finish from setting it to NONE, so we | |
1109 | * request cancellation. Either it runs and we will wait for it, | |
1110 | * or it has finished and no waiting will happen. | |
1111 | */ | |
1112 | atomic_inc(&fs_info->reloc_cancel_req); | |
1113 | btrfs_exclop_start_unlock(fs_info); | |
1114 | ||
1115 | if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) | |
1116 | wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, | |
1117 | TASK_INTERRUPTIBLE); | |
1118 | ||
1119 | return -ECANCELED; | |
1120 | } | |
1121 | ||
1122 | /* Something else is running or none */ | |
1123 | return -ENOTCONN; | |
1124 | } | |
1125 | ||
198605a8 | 1126 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1127 | void __user *arg) |
f46b5a66 | 1128 | { |
562d7b15 | 1129 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa | 1130 | struct inode *inode = file_inode(file); |
41044b41 | 1131 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
f46b5a66 CH |
1132 | u64 new_size; |
1133 | u64 old_size; | |
1134 | u64 devid = 1; | |
0b246afa | 1135 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f46b5a66 CH |
1136 | struct btrfs_ioctl_vol_args *vol_args; |
1137 | struct btrfs_trans_handle *trans; | |
1138 | struct btrfs_device *device = NULL; | |
1139 | char *sizestr; | |
9a40f122 | 1140 | char *retptr; |
f46b5a66 CH |
1141 | char *devstr = NULL; |
1142 | int ret = 0; | |
f46b5a66 | 1143 | int mod = 0; |
bb059a37 | 1144 | bool cancel; |
f46b5a66 | 1145 | |
e441d54d CM |
1146 | if (!capable(CAP_SYS_ADMIN)) |
1147 | return -EPERM; | |
1148 | ||
198605a8 MX |
1149 | ret = mnt_want_write_file(file); |
1150 | if (ret) | |
1151 | return ret; | |
1152 | ||
bb059a37 DS |
1153 | /* |
1154 | * Read the arguments before checking exclusivity to be able to | |
1155 | * distinguish regular resize and cancel | |
1156 | */ | |
dae7b665 | 1157 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1158 | if (IS_ERR(vol_args)) { |
1159 | ret = PTR_ERR(vol_args); | |
bb059a37 | 1160 | goto out_drop; |
c9e9f97b | 1161 | } |
5ab2b180 DS |
1162 | ret = btrfs_check_ioctl_vol_args_path(vol_args); |
1163 | if (ret < 0) | |
1164 | goto out_free; | |
1165 | ||
f46b5a66 | 1166 | sizestr = vol_args->name; |
bb059a37 DS |
1167 | cancel = (strcmp("cancel", sizestr) == 0); |
1168 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); | |
1169 | if (ret) | |
1170 | goto out_free; | |
1171 | /* Exclusive operation is now claimed */ | |
1172 | ||
f46b5a66 CH |
1173 | devstr = strchr(sizestr, ':'); |
1174 | if (devstr) { | |
f46b5a66 CH |
1175 | sizestr = devstr + 1; |
1176 | *devstr = '\0'; | |
1177 | devstr = vol_args->name; | |
58dfae63 Z |
1178 | ret = kstrtoull(devstr, 10, &devid); |
1179 | if (ret) | |
bb059a37 | 1180 | goto out_finish; |
dfd79829 MX |
1181 | if (!devid) { |
1182 | ret = -EINVAL; | |
bb059a37 | 1183 | goto out_finish; |
dfd79829 | 1184 | } |
0b246afa | 1185 | btrfs_info(fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1186 | } |
dba60f3f | 1187 | |
562d7b15 JB |
1188 | args.devid = devid; |
1189 | device = btrfs_find_device(fs_info->fs_devices, &args); | |
f46b5a66 | 1190 | if (!device) { |
0b246afa JM |
1191 | btrfs_info(fs_info, "resizer unable to find device %llu", |
1192 | devid); | |
dfd79829 | 1193 | ret = -ENODEV; |
bb059a37 | 1194 | goto out_finish; |
f46b5a66 | 1195 | } |
dba60f3f | 1196 | |
ebbede42 | 1197 | if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { |
0b246afa | 1198 | btrfs_info(fs_info, |
efe120a0 | 1199 | "resizer unable to apply on readonly device %llu", |
c1c9ff7c | 1200 | devid); |
dfd79829 | 1201 | ret = -EPERM; |
bb059a37 | 1202 | goto out_finish; |
4e42ae1b LB |
1203 | } |
1204 | ||
f46b5a66 | 1205 | if (!strcmp(sizestr, "max")) |
cda00eba | 1206 | new_size = bdev_nr_bytes(device->bdev); |
f46b5a66 CH |
1207 | else { |
1208 | if (sizestr[0] == '-') { | |
1209 | mod = -1; | |
1210 | sizestr++; | |
1211 | } else if (sizestr[0] == '+') { | |
1212 | mod = 1; | |
1213 | sizestr++; | |
1214 | } | |
9a40f122 GH |
1215 | new_size = memparse(sizestr, &retptr); |
1216 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1217 | ret = -EINVAL; |
bb059a37 | 1218 | goto out_finish; |
f46b5a66 CH |
1219 | } |
1220 | } | |
1221 | ||
401e29c1 | 1222 | if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { |
dfd79829 | 1223 | ret = -EPERM; |
bb059a37 | 1224 | goto out_finish; |
63a212ab SB |
1225 | } |
1226 | ||
7cc8e58d | 1227 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1228 | |
1229 | if (mod < 0) { | |
1230 | if (new_size > old_size) { | |
1231 | ret = -EINVAL; | |
bb059a37 | 1232 | goto out_finish; |
f46b5a66 CH |
1233 | } |
1234 | new_size = old_size - new_size; | |
1235 | } else if (mod > 0) { | |
eb8052e0 | 1236 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1237 | ret = -ERANGE; |
bb059a37 | 1238 | goto out_finish; |
eb8052e0 | 1239 | } |
f46b5a66 CH |
1240 | new_size = old_size + new_size; |
1241 | } | |
1242 | ||
ee22184b | 1243 | if (new_size < SZ_256M) { |
f46b5a66 | 1244 | ret = -EINVAL; |
bb059a37 | 1245 | goto out_finish; |
f46b5a66 | 1246 | } |
cda00eba | 1247 | if (new_size > bdev_nr_bytes(device->bdev)) { |
f46b5a66 | 1248 | ret = -EFBIG; |
bb059a37 | 1249 | goto out_finish; |
f46b5a66 CH |
1250 | } |
1251 | ||
47f08b96 | 1252 | new_size = round_down(new_size, fs_info->sectorsize); |
f46b5a66 | 1253 | |
f46b5a66 | 1254 | if (new_size > old_size) { |
a22285a6 | 1255 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1256 | if (IS_ERR(trans)) { |
1257 | ret = PTR_ERR(trans); | |
bb059a37 | 1258 | goto out_finish; |
98d5dc13 | 1259 | } |
f46b5a66 | 1260 | ret = btrfs_grow_device(trans, device, new_size); |
3a45bb20 | 1261 | btrfs_commit_transaction(trans); |
ece7d20e | 1262 | } else if (new_size < old_size) { |
f46b5a66 | 1263 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1264 | } /* equal, nothing need to do */ |
f46b5a66 | 1265 | |
faf8f7b9 MPS |
1266 | if (ret == 0 && new_size != old_size) |
1267 | btrfs_info_in_rcu(fs_info, | |
1268 | "resize device %s (devid %llu) from %llu to %llu", | |
cb3e217b | 1269 | btrfs_dev_name(device), device->devid, |
faf8f7b9 | 1270 | old_size, new_size); |
bb059a37 DS |
1271 | out_finish: |
1272 | btrfs_exclop_finish(fs_info); | |
c9e9f97b | 1273 | out_free: |
f46b5a66 | 1274 | kfree(vol_args); |
bb059a37 | 1275 | out_drop: |
18f39c41 | 1276 | mnt_drop_write_file(file); |
f46b5a66 CH |
1277 | return ret; |
1278 | } | |
1279 | ||
5d54c67e | 1280 | static noinline int __btrfs_ioctl_snap_create(struct file *file, |
4609e1f1 | 1281 | struct mnt_idmap *idmap, |
52f75f4f | 1282 | const char *name, unsigned long fd, int subvol, |
5d54c67e | 1283 | bool readonly, |
8696c533 | 1284 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1285 | { |
f46b5a66 | 1286 | int namelen; |
3de4586c | 1287 | int ret = 0; |
f46b5a66 | 1288 | |
325c50e3 JM |
1289 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1290 | return -ENOTDIR; | |
1291 | ||
a874a63e LB |
1292 | ret = mnt_want_write_file(file); |
1293 | if (ret) | |
1294 | goto out; | |
1295 | ||
72fd032e SW |
1296 | namelen = strlen(name); |
1297 | if (strchr(name, '/')) { | |
f46b5a66 | 1298 | ret = -EINVAL; |
a874a63e | 1299 | goto out_drop_write; |
f46b5a66 CH |
1300 | } |
1301 | ||
16780cab CM |
1302 | if (name[0] == '.' && |
1303 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1304 | ret = -EEXIST; | |
a874a63e | 1305 | goto out_drop_write; |
16780cab CM |
1306 | } |
1307 | ||
3de4586c | 1308 | if (subvol) { |
4609e1f1 | 1309 | ret = btrfs_mksubvol(&file->f_path, idmap, name, |
4d4340c9 | 1310 | namelen, NULL, readonly, inherit); |
cb8e7090 | 1311 | } else { |
2903ff01 | 1312 | struct fd src = fdget(fd); |
3de4586c | 1313 | struct inode *src_inode; |
2903ff01 | 1314 | if (!src.file) { |
3de4586c | 1315 | ret = -EINVAL; |
a874a63e | 1316 | goto out_drop_write; |
3de4586c CM |
1317 | } |
1318 | ||
496ad9aa AV |
1319 | src_inode = file_inode(src.file); |
1320 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
c79b4713 | 1321 | btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, |
efe120a0 | 1322 | "Snapshot src from another FS"); |
23ad5b17 | 1323 | ret = -EXDEV; |
01beba79 | 1324 | } else if (!inode_owner_or_capable(idmap, src_inode)) { |
d0242061 DS |
1325 | /* |
1326 | * Subvolume creation is not restricted, but snapshots | |
1327 | * are limited to own subvolumes only | |
1328 | */ | |
1329 | ret = -EPERM; | |
a8892fd7 JB |
1330 | } else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
1331 | /* | |
1332 | * Snapshots must be made with the src_inode referring | |
1333 | * to the subvolume inode, otherwise the permission | |
1334 | * checking above is useless because we may have | |
1335 | * permission on a lower directory but not the subvol | |
1336 | * itself. | |
1337 | */ | |
1338 | ret = -EINVAL; | |
ecd18815 | 1339 | } else { |
4609e1f1 | 1340 | ret = btrfs_mksnapshot(&file->f_path, idmap, |
4d4340c9 CB |
1341 | name, namelen, |
1342 | BTRFS_I(src_inode)->root, | |
1343 | readonly, inherit); | |
3de4586c | 1344 | } |
2903ff01 | 1345 | fdput(src); |
cb8e7090 | 1346 | } |
a874a63e LB |
1347 | out_drop_write: |
1348 | mnt_drop_write_file(file); | |
f46b5a66 | 1349 | out: |
72fd032e SW |
1350 | return ret; |
1351 | } | |
1352 | ||
1353 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1354 | void __user *arg, int subvol) |
72fd032e | 1355 | { |
fa0d2b9b | 1356 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1357 | int ret; |
1358 | ||
325c50e3 JM |
1359 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1360 | return -ENOTDIR; | |
1361 | ||
fa0d2b9b LZ |
1362 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1363 | if (IS_ERR(vol_args)) | |
1364 | return PTR_ERR(vol_args); | |
5ab2b180 DS |
1365 | ret = btrfs_check_ioctl_vol_args_path(vol_args); |
1366 | if (ret < 0) | |
1367 | goto out; | |
72fd032e | 1368 | |
4609e1f1 | 1369 | ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), |
4d4340c9 CB |
1370 | vol_args->name, vol_args->fd, subvol, |
1371 | false, NULL); | |
fdfb1e4f | 1372 | |
5ab2b180 | 1373 | out: |
fa0d2b9b LZ |
1374 | kfree(vol_args); |
1375 | return ret; | |
1376 | } | |
fdfb1e4f | 1377 | |
fa0d2b9b LZ |
1378 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1379 | void __user *arg, int subvol) | |
1380 | { | |
1381 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1382 | int ret; | |
b83cc969 | 1383 | bool readonly = false; |
6f72c7e2 | 1384 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1385 | |
325c50e3 JM |
1386 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1387 | return -ENOTDIR; | |
1388 | ||
fa0d2b9b LZ |
1389 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1390 | if (IS_ERR(vol_args)) | |
1391 | return PTR_ERR(vol_args); | |
0478adff DS |
1392 | ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args); |
1393 | if (ret < 0) | |
1394 | goto free_args; | |
75eaa0e2 | 1395 | |
673990db | 1396 | if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { |
b83cc969 | 1397 | ret = -EOPNOTSUPP; |
c47ca32d | 1398 | goto free_args; |
72fd032e | 1399 | } |
fa0d2b9b | 1400 | |
b83cc969 LZ |
1401 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1402 | readonly = true; | |
6f72c7e2 | 1403 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
86211eea | 1404 | struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file)); |
5011c5a6 DC |
1405 | |
1406 | if (vol_args->size < sizeof(*inherit) || | |
1407 | vol_args->size > PAGE_SIZE) { | |
6f72c7e2 | 1408 | ret = -EINVAL; |
c47ca32d | 1409 | goto free_args; |
6f72c7e2 AJ |
1410 | } |
1411 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1412 | if (IS_ERR(inherit)) { | |
1413 | ret = PTR_ERR(inherit); | |
c47ca32d | 1414 | goto free_args; |
6f72c7e2 | 1415 | } |
5011c5a6 | 1416 | |
86211eea QW |
1417 | ret = btrfs_qgroup_check_inherit(fs_info, inherit, vol_args->size); |
1418 | if (ret < 0) | |
5011c5a6 | 1419 | goto free_inherit; |
6f72c7e2 | 1420 | } |
fa0d2b9b | 1421 | |
4609e1f1 | 1422 | ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), |
4d4340c9 CB |
1423 | vol_args->name, vol_args->fd, subvol, |
1424 | readonly, inherit); | |
c47ca32d DC |
1425 | if (ret) |
1426 | goto free_inherit; | |
c47ca32d | 1427 | free_inherit: |
6f72c7e2 | 1428 | kfree(inherit); |
c47ca32d DC |
1429 | free_args: |
1430 | kfree(vol_args); | |
f46b5a66 CH |
1431 | return ret; |
1432 | } | |
1433 | ||
9ad12305 | 1434 | static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, |
0caa102d LZ |
1435 | void __user *arg) |
1436 | { | |
41044b41 | 1437 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0caa102d LZ |
1438 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1439 | int ret = 0; | |
1440 | u64 flags = 0; | |
1441 | ||
4a0cc7ca | 1442 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1443 | return -EINVAL; |
1444 | ||
0b246afa | 1445 | down_read(&fs_info->subvol_sem); |
0caa102d LZ |
1446 | if (btrfs_root_readonly(root)) |
1447 | flags |= BTRFS_SUBVOL_RDONLY; | |
0b246afa | 1448 | up_read(&fs_info->subvol_sem); |
0caa102d LZ |
1449 | |
1450 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1451 | ret = -EFAULT; | |
1452 | ||
1453 | return ret; | |
1454 | } | |
1455 | ||
1456 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1457 | void __user *arg) | |
1458 | { | |
496ad9aa | 1459 | struct inode *inode = file_inode(file); |
41044b41 | 1460 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0caa102d LZ |
1461 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1462 | struct btrfs_trans_handle *trans; | |
1463 | u64 root_flags; | |
1464 | u64 flags; | |
1465 | int ret = 0; | |
1466 | ||
01beba79 | 1467 | if (!inode_owner_or_capable(file_mnt_idmap(file), inode)) |
bd60ea0f DS |
1468 | return -EPERM; |
1469 | ||
b9ca0664 LB |
1470 | ret = mnt_want_write_file(file); |
1471 | if (ret) | |
1472 | goto out; | |
0caa102d | 1473 | |
4a0cc7ca | 1474 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
b9ca0664 LB |
1475 | ret = -EINVAL; |
1476 | goto out_drop_write; | |
1477 | } | |
0caa102d | 1478 | |
b9ca0664 LB |
1479 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1480 | ret = -EFAULT; | |
1481 | goto out_drop_write; | |
1482 | } | |
0caa102d | 1483 | |
b9ca0664 LB |
1484 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1485 | ret = -EOPNOTSUPP; | |
1486 | goto out_drop_write; | |
1487 | } | |
0caa102d | 1488 | |
0b246afa | 1489 | down_write(&fs_info->subvol_sem); |
0caa102d LZ |
1490 | |
1491 | /* nothing to do */ | |
1492 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1493 | goto out_drop_sem; |
0caa102d LZ |
1494 | |
1495 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1496 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1497 | btrfs_set_root_flags(&root->root_item, |
1498 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1499 | } else { |
1500 | /* | |
1501 | * Block RO -> RW transition if this subvolume is involved in | |
1502 | * send | |
1503 | */ | |
1504 | spin_lock(&root->root_item_lock); | |
1505 | if (root->send_in_progress == 0) { | |
1506 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1507 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1508 | spin_unlock(&root->root_item_lock); |
1509 | } else { | |
1510 | spin_unlock(&root->root_item_lock); | |
0b246afa JM |
1511 | btrfs_warn(fs_info, |
1512 | "Attempt to set subvolume %llu read-write during send", | |
e094f480 | 1513 | btrfs_root_id(root)); |
2c686537 DS |
1514 | ret = -EPERM; |
1515 | goto out_drop_sem; | |
1516 | } | |
1517 | } | |
0caa102d LZ |
1518 | |
1519 | trans = btrfs_start_transaction(root, 1); | |
1520 | if (IS_ERR(trans)) { | |
1521 | ret = PTR_ERR(trans); | |
1522 | goto out_reset; | |
1523 | } | |
1524 | ||
0b246afa | 1525 | ret = btrfs_update_root(trans, fs_info->tree_root, |
0caa102d | 1526 | &root->root_key, &root->root_item); |
9417ebc8 NB |
1527 | if (ret < 0) { |
1528 | btrfs_end_transaction(trans); | |
1529 | goto out_reset; | |
1530 | } | |
1531 | ||
1532 | ret = btrfs_commit_transaction(trans); | |
0caa102d | 1533 | |
0caa102d LZ |
1534 | out_reset: |
1535 | if (ret) | |
1536 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1537 | out_drop_sem: |
0b246afa | 1538 | up_write(&fs_info->subvol_sem); |
b9ca0664 LB |
1539 | out_drop_write: |
1540 | mnt_drop_write_file(file); | |
1541 | out: | |
0caa102d LZ |
1542 | return ret; |
1543 | } | |
1544 | ||
ac8e9819 CM |
1545 | static noinline int key_in_sk(struct btrfs_key *key, |
1546 | struct btrfs_ioctl_search_key *sk) | |
1547 | { | |
abc6e134 CM |
1548 | struct btrfs_key test; |
1549 | int ret; | |
1550 | ||
1551 | test.objectid = sk->min_objectid; | |
1552 | test.type = sk->min_type; | |
1553 | test.offset = sk->min_offset; | |
1554 | ||
1555 | ret = btrfs_comp_cpu_keys(key, &test); | |
1556 | if (ret < 0) | |
ac8e9819 | 1557 | return 0; |
abc6e134 CM |
1558 | |
1559 | test.objectid = sk->max_objectid; | |
1560 | test.type = sk->max_type; | |
1561 | test.offset = sk->max_offset; | |
1562 | ||
1563 | ret = btrfs_comp_cpu_keys(key, &test); | |
1564 | if (ret > 0) | |
ac8e9819 CM |
1565 | return 0; |
1566 | return 1; | |
1567 | } | |
1568 | ||
df397565 | 1569 | static noinline int copy_to_sk(struct btrfs_path *path, |
ac8e9819 CM |
1570 | struct btrfs_key *key, |
1571 | struct btrfs_ioctl_search_key *sk, | |
dec96fc2 | 1572 | u64 *buf_size, |
ba346b35 | 1573 | char __user *ubuf, |
ac8e9819 CM |
1574 | unsigned long *sk_offset, |
1575 | int *num_found) | |
1576 | { | |
1577 | u64 found_transid; | |
1578 | struct extent_buffer *leaf; | |
1579 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 1580 | struct btrfs_key test; |
ac8e9819 CM |
1581 | unsigned long item_off; |
1582 | unsigned long item_len; | |
1583 | int nritems; | |
1584 | int i; | |
1585 | int slot; | |
ac8e9819 CM |
1586 | int ret = 0; |
1587 | ||
1588 | leaf = path->nodes[0]; | |
1589 | slot = path->slots[0]; | |
1590 | nritems = btrfs_header_nritems(leaf); | |
1591 | ||
1592 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1593 | i = nritems; | |
1594 | goto advance_key; | |
1595 | } | |
1596 | found_transid = btrfs_header_generation(leaf); | |
1597 | ||
1598 | for (i = slot; i < nritems; i++) { | |
1599 | item_off = btrfs_item_ptr_offset(leaf, i); | |
3212fa14 | 1600 | item_len = btrfs_item_size(leaf, i); |
ac8e9819 | 1601 | |
03b71c6c GP |
1602 | btrfs_item_key_to_cpu(leaf, key, i); |
1603 | if (!key_in_sk(key, sk)) | |
1604 | continue; | |
1605 | ||
9b6e817d | 1606 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1607 | if (*num_found) { |
1608 | ret = 1; | |
1609 | goto out; | |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * return one empty item back for v1, which does not | |
1614 | * handle -EOVERFLOW | |
1615 | */ | |
1616 | ||
9b6e817d | 1617 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 1618 | item_len = 0; |
8f5f6178 GH |
1619 | ret = -EOVERFLOW; |
1620 | } | |
ac8e9819 | 1621 | |
9b6e817d | 1622 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 1623 | ret = 1; |
25c9bc2e | 1624 | goto out; |
ac8e9819 CM |
1625 | } |
1626 | ||
ac8e9819 CM |
1627 | sh.objectid = key->objectid; |
1628 | sh.offset = key->offset; | |
1629 | sh.type = key->type; | |
1630 | sh.len = item_len; | |
1631 | sh.transid = found_transid; | |
1632 | ||
a48b73ec JB |
1633 | /* |
1634 | * Copy search result header. If we fault then loop again so we | |
1635 | * can fault in the pages and -EFAULT there if there's a | |
1636 | * problem. Otherwise we'll fault and then copy the buffer in | |
1637 | * properly this next time through | |
1638 | */ | |
1639 | if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { | |
1640 | ret = 0; | |
ba346b35 GH |
1641 | goto out; |
1642 | } | |
1643 | ||
ac8e9819 CM |
1644 | *sk_offset += sizeof(sh); |
1645 | ||
1646 | if (item_len) { | |
ba346b35 | 1647 | char __user *up = ubuf + *sk_offset; |
a48b73ec JB |
1648 | /* |
1649 | * Copy the item, same behavior as above, but reset the | |
1650 | * * sk_offset so we copy the full thing again. | |
1651 | */ | |
1652 | if (read_extent_buffer_to_user_nofault(leaf, up, | |
1653 | item_off, item_len)) { | |
1654 | ret = 0; | |
1655 | *sk_offset -= sizeof(sh); | |
ba346b35 GH |
1656 | goto out; |
1657 | } | |
1658 | ||
ac8e9819 | 1659 | *sk_offset += item_len; |
ac8e9819 | 1660 | } |
e2156867 | 1661 | (*num_found)++; |
ac8e9819 | 1662 | |
8f5f6178 GH |
1663 | if (ret) /* -EOVERFLOW from above */ |
1664 | goto out; | |
1665 | ||
25c9bc2e GH |
1666 | if (*num_found >= sk->nr_items) { |
1667 | ret = 1; | |
1668 | goto out; | |
1669 | } | |
ac8e9819 CM |
1670 | } |
1671 | advance_key: | |
abc6e134 | 1672 | ret = 0; |
dd81d459 NA |
1673 | test.objectid = sk->max_objectid; |
1674 | test.type = sk->max_type; | |
1675 | test.offset = sk->max_offset; | |
1676 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
1677 | ret = 1; | |
1678 | else if (key->offset < (u64)-1) | |
ac8e9819 | 1679 | key->offset++; |
dd81d459 | 1680 | else if (key->type < (u8)-1) { |
abc6e134 | 1681 | key->offset = 0; |
ac8e9819 | 1682 | key->type++; |
dd81d459 | 1683 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
1684 | key->offset = 0; |
1685 | key->type = 0; | |
ac8e9819 | 1686 | key->objectid++; |
abc6e134 CM |
1687 | } else |
1688 | ret = 1; | |
25c9bc2e | 1689 | out: |
ba346b35 GH |
1690 | /* |
1691 | * 0: all items from this leaf copied, continue with next | |
1692 | * 1: * more items can be copied, but unused buffer is too small | |
1693 | * * all items were found | |
1694 | * Either way, it will stops the loop which iterates to the next | |
1695 | * leaf | |
1696 | * -EOVERFLOW: item was to large for buffer | |
1697 | * -EFAULT: could not copy extent buffer back to userspace | |
1698 | */ | |
ac8e9819 CM |
1699 | return ret; |
1700 | } | |
1701 | ||
1702 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 1703 | struct btrfs_ioctl_search_key *sk, |
dec96fc2 | 1704 | u64 *buf_size, |
ba346b35 | 1705 | char __user *ubuf) |
ac8e9819 | 1706 | { |
41044b41 | 1707 | struct btrfs_fs_info *info = inode_to_fs_info(inode); |
ac8e9819 CM |
1708 | struct btrfs_root *root; |
1709 | struct btrfs_key key; | |
ac8e9819 | 1710 | struct btrfs_path *path; |
ac8e9819 CM |
1711 | int ret; |
1712 | int num_found = 0; | |
1713 | unsigned long sk_offset = 0; | |
1714 | ||
9b6e817d GH |
1715 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
1716 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 1717 | return -EOVERFLOW; |
9b6e817d | 1718 | } |
12544442 | 1719 | |
ac8e9819 CM |
1720 | path = btrfs_alloc_path(); |
1721 | if (!path) | |
1722 | return -ENOMEM; | |
1723 | ||
1724 | if (sk->tree_id == 0) { | |
1725 | /* search the root of the inode that was passed */ | |
00246528 | 1726 | root = btrfs_grab_root(BTRFS_I(inode)->root); |
ac8e9819 | 1727 | } else { |
56e9357a | 1728 | root = btrfs_get_fs_root(info, sk->tree_id, true); |
ac8e9819 | 1729 | if (IS_ERR(root)) { |
ac8e9819 | 1730 | btrfs_free_path(path); |
ad1e3d56 | 1731 | return PTR_ERR(root); |
ac8e9819 CM |
1732 | } |
1733 | } | |
1734 | ||
1735 | key.objectid = sk->min_objectid; | |
1736 | key.type = sk->min_type; | |
1737 | key.offset = sk->min_offset; | |
1738 | ||
67871254 | 1739 | while (1) { |
bb523b40 | 1740 | ret = -EFAULT; |
18788e34 CM |
1741 | /* |
1742 | * Ensure that the whole user buffer is faulted in at sub-page | |
1743 | * granularity, otherwise the loop may live-lock. | |
1744 | */ | |
1745 | if (fault_in_subpage_writeable(ubuf + sk_offset, | |
1746 | *buf_size - sk_offset)) | |
a48b73ec JB |
1747 | break; |
1748 | ||
6174d3cb | 1749 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
1750 | if (ret != 0) { |
1751 | if (ret > 0) | |
1752 | ret = 0; | |
1753 | goto err; | |
1754 | } | |
df397565 | 1755 | ret = copy_to_sk(path, &key, sk, buf_size, ubuf, |
ac8e9819 | 1756 | &sk_offset, &num_found); |
b3b4aa74 | 1757 | btrfs_release_path(path); |
25c9bc2e | 1758 | if (ret) |
ac8e9819 CM |
1759 | break; |
1760 | ||
1761 | } | |
8f5f6178 GH |
1762 | if (ret > 0) |
1763 | ret = 0; | |
ac8e9819 CM |
1764 | err: |
1765 | sk->nr_items = num_found; | |
00246528 | 1766 | btrfs_put_root(root); |
ac8e9819 CM |
1767 | btrfs_free_path(path); |
1768 | return ret; | |
1769 | } | |
1770 | ||
9ad12305 SK |
1771 | static noinline int btrfs_ioctl_tree_search(struct inode *inode, |
1772 | void __user *argp) | |
ac8e9819 | 1773 | { |
0d031dc4 | 1774 | struct btrfs_ioctl_search_args __user *uargs = argp; |
ba346b35 | 1775 | struct btrfs_ioctl_search_key sk; |
9b6e817d | 1776 | int ret; |
dec96fc2 | 1777 | u64 buf_size; |
ac8e9819 CM |
1778 | |
1779 | if (!capable(CAP_SYS_ADMIN)) | |
1780 | return -EPERM; | |
1781 | ||
ba346b35 GH |
1782 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) |
1783 | return -EFAULT; | |
ac8e9819 | 1784 | |
ba346b35 | 1785 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 1786 | |
ba346b35 | 1787 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
1788 | |
1789 | /* | |
1790 | * In the origin implementation an overflow is handled by returning a | |
1791 | * search header with a len of zero, so reset ret. | |
1792 | */ | |
1793 | if (ret == -EOVERFLOW) | |
1794 | ret = 0; | |
1795 | ||
ba346b35 | 1796 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 1797 | ret = -EFAULT; |
ac8e9819 CM |
1798 | return ret; |
1799 | } | |
1800 | ||
9ad12305 | 1801 | static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, |
cc68a8a5 GH |
1802 | void __user *argp) |
1803 | { | |
0d031dc4 | 1804 | struct btrfs_ioctl_search_args_v2 __user *uarg = argp; |
cc68a8a5 | 1805 | struct btrfs_ioctl_search_args_v2 args; |
cc68a8a5 | 1806 | int ret; |
dec96fc2 FM |
1807 | u64 buf_size; |
1808 | const u64 buf_limit = SZ_16M; | |
cc68a8a5 GH |
1809 | |
1810 | if (!capable(CAP_SYS_ADMIN)) | |
1811 | return -EPERM; | |
1812 | ||
1813 | /* copy search header and buffer size */ | |
cc68a8a5 GH |
1814 | if (copy_from_user(&args, uarg, sizeof(args))) |
1815 | return -EFAULT; | |
1816 | ||
1817 | buf_size = args.buf_size; | |
1818 | ||
cc68a8a5 GH |
1819 | /* limit result size to 16MB */ |
1820 | if (buf_size > buf_limit) | |
1821 | buf_size = buf_limit; | |
1822 | ||
cc68a8a5 | 1823 | ret = search_ioctl(inode, &args.key, &buf_size, |
718dc5fa | 1824 | (char __user *)(&uarg->buf[0])); |
cc68a8a5 GH |
1825 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) |
1826 | ret = -EFAULT; | |
1827 | else if (ret == -EOVERFLOW && | |
1828 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
1829 | ret = -EFAULT; | |
1830 | ||
ac8e9819 CM |
1831 | return ret; |
1832 | } | |
1833 | ||
98d377a0 | 1834 | /* |
ac8e9819 CM |
1835 | * Search INODE_REFs to identify path name of 'dirid' directory |
1836 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1837 | */ | |
98d377a0 TH |
1838 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1839 | u64 tree_id, u64 dirid, char *name) | |
1840 | { | |
1841 | struct btrfs_root *root; | |
1842 | struct btrfs_key key; | |
ac8e9819 | 1843 | char *ptr; |
98d377a0 TH |
1844 | int ret = -1; |
1845 | int slot; | |
1846 | int len; | |
1847 | int total_len = 0; | |
1848 | struct btrfs_inode_ref *iref; | |
1849 | struct extent_buffer *l; | |
1850 | struct btrfs_path *path; | |
1851 | ||
1852 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1853 | name[0]='\0'; | |
1854 | return 0; | |
1855 | } | |
1856 | ||
1857 | path = btrfs_alloc_path(); | |
1858 | if (!path) | |
1859 | return -ENOMEM; | |
1860 | ||
c8bcbfbd | 1861 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; |
98d377a0 | 1862 | |
56e9357a | 1863 | root = btrfs_get_fs_root(info, tree_id, true); |
98d377a0 | 1864 | if (IS_ERR(root)) { |
ad1e3d56 | 1865 | ret = PTR_ERR(root); |
88234012 JB |
1866 | root = NULL; |
1867 | goto out; | |
1868 | } | |
98d377a0 TH |
1869 | |
1870 | key.objectid = dirid; | |
1871 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1872 | key.offset = (u64)-1; |
98d377a0 | 1873 | |
67871254 | 1874 | while (1) { |
0ff40a91 | 1875 | ret = btrfs_search_backwards(root, &key, path); |
98d377a0 TH |
1876 | if (ret < 0) |
1877 | goto out; | |
18674c6c | 1878 | else if (ret > 0) { |
0ff40a91 MPS |
1879 | ret = -ENOENT; |
1880 | goto out; | |
18674c6c | 1881 | } |
98d377a0 TH |
1882 | |
1883 | l = path->nodes[0]; | |
1884 | slot = path->slots[0]; | |
98d377a0 | 1885 | |
98d377a0 TH |
1886 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
1887 | len = btrfs_inode_ref_name_len(l, iref); | |
1888 | ptr -= len + 1; | |
1889 | total_len += len + 1; | |
a696cf35 FDBM |
1890 | if (ptr < name) { |
1891 | ret = -ENAMETOOLONG; | |
98d377a0 | 1892 | goto out; |
a696cf35 | 1893 | } |
98d377a0 TH |
1894 | |
1895 | *(ptr + len) = '/'; | |
67871254 | 1896 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
1897 | |
1898 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1899 | break; | |
1900 | ||
b3b4aa74 | 1901 | btrfs_release_path(path); |
98d377a0 | 1902 | key.objectid = key.offset; |
8ad6fcab | 1903 | key.offset = (u64)-1; |
98d377a0 | 1904 | dirid = key.objectid; |
98d377a0 | 1905 | } |
77906a50 | 1906 | memmove(name, ptr, total_len); |
67871254 | 1907 | name[total_len] = '\0'; |
98d377a0 TH |
1908 | ret = 0; |
1909 | out: | |
00246528 | 1910 | btrfs_put_root(root); |
98d377a0 | 1911 | btrfs_free_path(path); |
ac8e9819 CM |
1912 | return ret; |
1913 | } | |
1914 | ||
4609e1f1 | 1915 | static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap, |
6623d9a0 | 1916 | struct inode *inode, |
23d0b79d TM |
1917 | struct btrfs_ioctl_ino_lookup_user_args *args) |
1918 | { | |
1919 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
1920 | struct super_block *sb = inode->i_sb; | |
1921 | struct btrfs_key upper_limit = BTRFS_I(inode)->location; | |
e094f480 | 1922 | u64 treeid = btrfs_root_id(BTRFS_I(inode)->root); |
23d0b79d TM |
1923 | u64 dirid = args->dirid; |
1924 | unsigned long item_off; | |
1925 | unsigned long item_len; | |
1926 | struct btrfs_inode_ref *iref; | |
1927 | struct btrfs_root_ref *rref; | |
b8a49ae1 | 1928 | struct btrfs_root *root = NULL; |
23d0b79d TM |
1929 | struct btrfs_path *path; |
1930 | struct btrfs_key key, key2; | |
1931 | struct extent_buffer *leaf; | |
1932 | struct inode *temp_inode; | |
1933 | char *ptr; | |
1934 | int slot; | |
1935 | int len; | |
1936 | int total_len = 0; | |
1937 | int ret; | |
1938 | ||
1939 | path = btrfs_alloc_path(); | |
1940 | if (!path) | |
1941 | return -ENOMEM; | |
1942 | ||
1943 | /* | |
1944 | * If the bottom subvolume does not exist directly under upper_limit, | |
1945 | * construct the path in from the bottom up. | |
1946 | */ | |
1947 | if (dirid != upper_limit.objectid) { | |
1948 | ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; | |
1949 | ||
56e9357a | 1950 | root = btrfs_get_fs_root(fs_info, treeid, true); |
23d0b79d TM |
1951 | if (IS_ERR(root)) { |
1952 | ret = PTR_ERR(root); | |
1953 | goto out; | |
1954 | } | |
1955 | ||
1956 | key.objectid = dirid; | |
1957 | key.type = BTRFS_INODE_REF_KEY; | |
1958 | key.offset = (u64)-1; | |
1959 | while (1) { | |
0ff40a91 MPS |
1960 | ret = btrfs_search_backwards(root, &key, path); |
1961 | if (ret < 0) | |
1962 | goto out_put; | |
1963 | else if (ret > 0) { | |
1964 | ret = -ENOENT; | |
b8a49ae1 | 1965 | goto out_put; |
23d0b79d TM |
1966 | } |
1967 | ||
1968 | leaf = path->nodes[0]; | |
1969 | slot = path->slots[0]; | |
23d0b79d TM |
1970 | |
1971 | iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); | |
1972 | len = btrfs_inode_ref_name_len(leaf, iref); | |
1973 | ptr -= len + 1; | |
1974 | total_len += len + 1; | |
1975 | if (ptr < args->path) { | |
1976 | ret = -ENAMETOOLONG; | |
b8a49ae1 | 1977 | goto out_put; |
23d0b79d TM |
1978 | } |
1979 | ||
1980 | *(ptr + len) = '/'; | |
1981 | read_extent_buffer(leaf, ptr, | |
1982 | (unsigned long)(iref + 1), len); | |
1983 | ||
1984 | /* Check the read+exec permission of this directory */ | |
1985 | ret = btrfs_previous_item(root, path, dirid, | |
1986 | BTRFS_INODE_ITEM_KEY); | |
1987 | if (ret < 0) { | |
b8a49ae1 | 1988 | goto out_put; |
23d0b79d TM |
1989 | } else if (ret > 0) { |
1990 | ret = -ENOENT; | |
b8a49ae1 | 1991 | goto out_put; |
23d0b79d TM |
1992 | } |
1993 | ||
1994 | leaf = path->nodes[0]; | |
1995 | slot = path->slots[0]; | |
1996 | btrfs_item_key_to_cpu(leaf, &key2, slot); | |
1997 | if (key2.objectid != dirid) { | |
1998 | ret = -ENOENT; | |
b8a49ae1 | 1999 | goto out_put; |
23d0b79d TM |
2000 | } |
2001 | ||
ee34a82e FM |
2002 | /* |
2003 | * We don't need the path anymore, so release it and | |
2004 | * avoid deadlocks and lockdep warnings in case | |
2005 | * btrfs_iget() needs to lookup the inode from its root | |
2006 | * btree and lock the same leaf. | |
2007 | */ | |
2008 | btrfs_release_path(path); | |
0202e83f | 2009 | temp_inode = btrfs_iget(sb, key2.objectid, root); |
3ca57bd6 MT |
2010 | if (IS_ERR(temp_inode)) { |
2011 | ret = PTR_ERR(temp_inode); | |
b8a49ae1 | 2012 | goto out_put; |
3ca57bd6 | 2013 | } |
4609e1f1 | 2014 | ret = inode_permission(idmap, temp_inode, |
47291baa | 2015 | MAY_READ | MAY_EXEC); |
23d0b79d TM |
2016 | iput(temp_inode); |
2017 | if (ret) { | |
2018 | ret = -EACCES; | |
b8a49ae1 | 2019 | goto out_put; |
23d0b79d TM |
2020 | } |
2021 | ||
2022 | if (key.offset == upper_limit.objectid) | |
2023 | break; | |
2024 | if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { | |
2025 | ret = -EACCES; | |
b8a49ae1 | 2026 | goto out_put; |
23d0b79d TM |
2027 | } |
2028 | ||
23d0b79d TM |
2029 | key.objectid = key.offset; |
2030 | key.offset = (u64)-1; | |
2031 | dirid = key.objectid; | |
2032 | } | |
2033 | ||
2034 | memmove(args->path, ptr, total_len); | |
2035 | args->path[total_len] = '\0'; | |
00246528 | 2036 | btrfs_put_root(root); |
b8a49ae1 | 2037 | root = NULL; |
23d0b79d TM |
2038 | btrfs_release_path(path); |
2039 | } | |
2040 | ||
2041 | /* Get the bottom subvolume's name from ROOT_REF */ | |
23d0b79d TM |
2042 | key.objectid = treeid; |
2043 | key.type = BTRFS_ROOT_REF_KEY; | |
2044 | key.offset = args->treeid; | |
b8a49ae1 | 2045 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
23d0b79d TM |
2046 | if (ret < 0) { |
2047 | goto out; | |
2048 | } else if (ret > 0) { | |
2049 | ret = -ENOENT; | |
2050 | goto out; | |
2051 | } | |
2052 | ||
2053 | leaf = path->nodes[0]; | |
2054 | slot = path->slots[0]; | |
2055 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2056 | ||
2057 | item_off = btrfs_item_ptr_offset(leaf, slot); | |
3212fa14 | 2058 | item_len = btrfs_item_size(leaf, slot); |
23d0b79d TM |
2059 | /* Check if dirid in ROOT_REF corresponds to passed dirid */ |
2060 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2061 | if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { | |
2062 | ret = -EINVAL; | |
2063 | goto out; | |
2064 | } | |
2065 | ||
2066 | /* Copy subvolume's name */ | |
2067 | item_off += sizeof(struct btrfs_root_ref); | |
2068 | item_len -= sizeof(struct btrfs_root_ref); | |
2069 | read_extent_buffer(leaf, args->name, item_off, item_len); | |
2070 | args->name[item_len] = 0; | |
2071 | ||
b8a49ae1 | 2072 | out_put: |
00246528 | 2073 | btrfs_put_root(root); |
23d0b79d TM |
2074 | out: |
2075 | btrfs_free_path(path); | |
2076 | return ret; | |
2077 | } | |
2078 | ||
dc408ccd | 2079 | static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, |
ac8e9819 CM |
2080 | void __user *argp) |
2081 | { | |
bece2e82 | 2082 | struct btrfs_ioctl_ino_lookup_args *args; |
01b810b8 | 2083 | int ret = 0; |
ac8e9819 | 2084 | |
2354d08f JL |
2085 | args = memdup_user(argp, sizeof(*args)); |
2086 | if (IS_ERR(args)) | |
2087 | return PTR_ERR(args); | |
c2b96929 | 2088 | |
01b810b8 DS |
2089 | /* |
2090 | * Unprivileged query to obtain the containing subvolume root id. The | |
2091 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2092 | */ | |
1b53ac4d | 2093 | if (args->treeid == 0) |
e094f480 | 2094 | args->treeid = btrfs_root_id(root); |
1b53ac4d | 2095 | |
01b810b8 DS |
2096 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2097 | args->name[0] = 0; | |
2098 | goto out; | |
2099 | } | |
2100 | ||
2101 | if (!capable(CAP_SYS_ADMIN)) { | |
2102 | ret = -EPERM; | |
2103 | goto out; | |
2104 | } | |
2105 | ||
dc408ccd | 2106 | ret = btrfs_search_path_in_tree(root->fs_info, |
ac8e9819 CM |
2107 | args->treeid, args->objectid, |
2108 | args->name); | |
2109 | ||
01b810b8 | 2110 | out: |
ac8e9819 CM |
2111 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2112 | ret = -EFAULT; | |
2113 | ||
2114 | kfree(args); | |
98d377a0 TH |
2115 | return ret; |
2116 | } | |
2117 | ||
23d0b79d TM |
2118 | /* |
2119 | * Version of ino_lookup ioctl (unprivileged) | |
2120 | * | |
2121 | * The main differences from ino_lookup ioctl are: | |
2122 | * | |
2123 | * 1. Read + Exec permission will be checked using inode_permission() during | |
2124 | * path construction. -EACCES will be returned in case of failure. | |
2125 | * 2. Path construction will be stopped at the inode number which corresponds | |
2126 | * to the fd with which this ioctl is called. If constructed path does not | |
2127 | * exist under fd's inode, -EACCES will be returned. | |
2128 | * 3. The name of bottom subvolume is also searched and filled. | |
2129 | */ | |
2130 | static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) | |
2131 | { | |
2132 | struct btrfs_ioctl_ino_lookup_user_args *args; | |
2133 | struct inode *inode; | |
2134 | int ret; | |
2135 | ||
2136 | args = memdup_user(argp, sizeof(*args)); | |
2137 | if (IS_ERR(args)) | |
2138 | return PTR_ERR(args); | |
2139 | ||
2140 | inode = file_inode(file); | |
2141 | ||
2142 | if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && | |
2143 | BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { | |
2144 | /* | |
2145 | * The subvolume does not exist under fd with which this is | |
2146 | * called | |
2147 | */ | |
2148 | kfree(args); | |
2149 | return -EACCES; | |
2150 | } | |
2151 | ||
4609e1f1 | 2152 | ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args); |
23d0b79d TM |
2153 | |
2154 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2155 | ret = -EFAULT; | |
2156 | ||
2157 | kfree(args); | |
2158 | return ret; | |
2159 | } | |
2160 | ||
b64ec075 | 2161 | /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ |
9ad12305 | 2162 | static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) |
b64ec075 TM |
2163 | { |
2164 | struct btrfs_ioctl_get_subvol_info_args *subvol_info; | |
2165 | struct btrfs_fs_info *fs_info; | |
2166 | struct btrfs_root *root; | |
2167 | struct btrfs_path *path; | |
2168 | struct btrfs_key key; | |
2169 | struct btrfs_root_item *root_item; | |
2170 | struct btrfs_root_ref *rref; | |
2171 | struct extent_buffer *leaf; | |
2172 | unsigned long item_off; | |
2173 | unsigned long item_len; | |
b64ec075 TM |
2174 | int slot; |
2175 | int ret = 0; | |
2176 | ||
2177 | path = btrfs_alloc_path(); | |
2178 | if (!path) | |
2179 | return -ENOMEM; | |
2180 | ||
2181 | subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); | |
2182 | if (!subvol_info) { | |
2183 | btrfs_free_path(path); | |
2184 | return -ENOMEM; | |
2185 | } | |
2186 | ||
b64ec075 TM |
2187 | fs_info = BTRFS_I(inode)->root->fs_info; |
2188 | ||
2189 | /* Get root_item of inode's subvolume */ | |
e094f480 | 2190 | key.objectid = btrfs_root_id(BTRFS_I(inode)->root); |
56e9357a | 2191 | root = btrfs_get_fs_root(fs_info, key.objectid, true); |
b64ec075 TM |
2192 | if (IS_ERR(root)) { |
2193 | ret = PTR_ERR(root); | |
04734e84 JB |
2194 | goto out_free; |
2195 | } | |
b64ec075 TM |
2196 | root_item = &root->root_item; |
2197 | ||
2198 | subvol_info->treeid = key.objectid; | |
2199 | ||
2200 | subvol_info->generation = btrfs_root_generation(root_item); | |
2201 | subvol_info->flags = btrfs_root_flags(root_item); | |
2202 | ||
2203 | memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); | |
2204 | memcpy(subvol_info->parent_uuid, root_item->parent_uuid, | |
2205 | BTRFS_UUID_SIZE); | |
2206 | memcpy(subvol_info->received_uuid, root_item->received_uuid, | |
2207 | BTRFS_UUID_SIZE); | |
2208 | ||
2209 | subvol_info->ctransid = btrfs_root_ctransid(root_item); | |
2210 | subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); | |
2211 | subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); | |
2212 | ||
2213 | subvol_info->otransid = btrfs_root_otransid(root_item); | |
2214 | subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); | |
2215 | subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); | |
2216 | ||
2217 | subvol_info->stransid = btrfs_root_stransid(root_item); | |
2218 | subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); | |
2219 | subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); | |
2220 | ||
2221 | subvol_info->rtransid = btrfs_root_rtransid(root_item); | |
2222 | subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); | |
2223 | subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); | |
2224 | ||
2225 | if (key.objectid != BTRFS_FS_TREE_OBJECTID) { | |
2226 | /* Search root tree for ROOT_BACKREF of this subvolume */ | |
b64ec075 TM |
2227 | key.type = BTRFS_ROOT_BACKREF_KEY; |
2228 | key.offset = 0; | |
04734e84 | 2229 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
b64ec075 TM |
2230 | if (ret < 0) { |
2231 | goto out; | |
2232 | } else if (path->slots[0] >= | |
2233 | btrfs_header_nritems(path->nodes[0])) { | |
04734e84 | 2234 | ret = btrfs_next_leaf(fs_info->tree_root, path); |
b64ec075 TM |
2235 | if (ret < 0) { |
2236 | goto out; | |
2237 | } else if (ret > 0) { | |
2238 | ret = -EUCLEAN; | |
2239 | goto out; | |
2240 | } | |
2241 | } | |
2242 | ||
2243 | leaf = path->nodes[0]; | |
2244 | slot = path->slots[0]; | |
2245 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2246 | if (key.objectid == subvol_info->treeid && | |
2247 | key.type == BTRFS_ROOT_BACKREF_KEY) { | |
2248 | subvol_info->parent_id = key.offset; | |
2249 | ||
2250 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2251 | subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); | |
2252 | ||
2253 | item_off = btrfs_item_ptr_offset(leaf, slot) | |
2254 | + sizeof(struct btrfs_root_ref); | |
3212fa14 | 2255 | item_len = btrfs_item_size(leaf, slot) |
b64ec075 TM |
2256 | - sizeof(struct btrfs_root_ref); |
2257 | read_extent_buffer(leaf, subvol_info->name, | |
2258 | item_off, item_len); | |
2259 | } else { | |
2260 | ret = -ENOENT; | |
2261 | goto out; | |
2262 | } | |
2263 | } | |
2264 | ||
013c1c55 AJ |
2265 | btrfs_free_path(path); |
2266 | path = NULL; | |
b64ec075 TM |
2267 | if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) |
2268 | ret = -EFAULT; | |
2269 | ||
2270 | out: | |
00246528 | 2271 | btrfs_put_root(root); |
04734e84 | 2272 | out_free: |
b64ec075 | 2273 | btrfs_free_path(path); |
b091f7fe | 2274 | kfree(subvol_info); |
b64ec075 TM |
2275 | return ret; |
2276 | } | |
2277 | ||
42e4b520 TM |
2278 | /* |
2279 | * Return ROOT_REF information of the subvolume containing this inode | |
2280 | * except the subvolume name. | |
2281 | */ | |
9ad12305 | 2282 | static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, |
dc408ccd | 2283 | void __user *argp) |
42e4b520 TM |
2284 | { |
2285 | struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; | |
2286 | struct btrfs_root_ref *rref; | |
42e4b520 TM |
2287 | struct btrfs_path *path; |
2288 | struct btrfs_key key; | |
2289 | struct extent_buffer *leaf; | |
42e4b520 TM |
2290 | u64 objectid; |
2291 | int slot; | |
2292 | int ret; | |
2293 | u8 found; | |
2294 | ||
2295 | path = btrfs_alloc_path(); | |
2296 | if (!path) | |
2297 | return -ENOMEM; | |
2298 | ||
2299 | rootrefs = memdup_user(argp, sizeof(*rootrefs)); | |
2300 | if (IS_ERR(rootrefs)) { | |
2301 | btrfs_free_path(path); | |
2302 | return PTR_ERR(rootrefs); | |
2303 | } | |
2304 | ||
e094f480 | 2305 | objectid = btrfs_root_id(root); |
42e4b520 TM |
2306 | key.objectid = objectid; |
2307 | key.type = BTRFS_ROOT_REF_KEY; | |
2308 | key.offset = rootrefs->min_treeid; | |
2309 | found = 0; | |
2310 | ||
9ad12305 | 2311 | root = root->fs_info->tree_root; |
42e4b520 TM |
2312 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2313 | if (ret < 0) { | |
2314 | goto out; | |
2315 | } else if (path->slots[0] >= | |
2316 | btrfs_header_nritems(path->nodes[0])) { | |
2317 | ret = btrfs_next_leaf(root, path); | |
2318 | if (ret < 0) { | |
2319 | goto out; | |
2320 | } else if (ret > 0) { | |
2321 | ret = -EUCLEAN; | |
2322 | goto out; | |
2323 | } | |
2324 | } | |
2325 | while (1) { | |
2326 | leaf = path->nodes[0]; | |
2327 | slot = path->slots[0]; | |
2328 | ||
2329 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2330 | if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { | |
2331 | ret = 0; | |
2332 | goto out; | |
2333 | } | |
2334 | ||
2335 | if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { | |
2336 | ret = -EOVERFLOW; | |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2341 | rootrefs->rootref[found].treeid = key.offset; | |
2342 | rootrefs->rootref[found].dirid = | |
2343 | btrfs_root_ref_dirid(leaf, rref); | |
2344 | found++; | |
2345 | ||
2346 | ret = btrfs_next_item(root, path); | |
2347 | if (ret < 0) { | |
2348 | goto out; | |
2349 | } else if (ret > 0) { | |
2350 | ret = -EUCLEAN; | |
2351 | goto out; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | out: | |
b740d806 JB |
2356 | btrfs_free_path(path); |
2357 | ||
42e4b520 TM |
2358 | if (!ret || ret == -EOVERFLOW) { |
2359 | rootrefs->num_items = found; | |
2360 | /* update min_treeid for next search */ | |
2361 | if (found) | |
2362 | rootrefs->min_treeid = | |
2363 | rootrefs->rootref[found - 1].treeid + 1; | |
2364 | if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) | |
2365 | ret = -EFAULT; | |
2366 | } | |
2367 | ||
2368 | kfree(rootrefs); | |
42e4b520 TM |
2369 | |
2370 | return ret; | |
2371 | } | |
2372 | ||
76dda93c | 2373 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
949964c9 MPS |
2374 | void __user *arg, |
2375 | bool destroy_v2) | |
76dda93c | 2376 | { |
54563d41 | 2377 | struct dentry *parent = file->f_path.dentry; |
76dda93c | 2378 | struct dentry *dentry; |
2b0143b5 | 2379 | struct inode *dir = d_inode(parent); |
41044b41 | 2380 | struct btrfs_fs_info *fs_info = inode_to_fs_info(dir); |
76dda93c YZ |
2381 | struct inode *inode; |
2382 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2383 | struct btrfs_root *dest = NULL; | |
949964c9 MPS |
2384 | struct btrfs_ioctl_vol_args *vol_args = NULL; |
2385 | struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; | |
4609e1f1 | 2386 | struct mnt_idmap *idmap = file_mnt_idmap(file); |
949964c9 MPS |
2387 | char *subvol_name, *subvol_name_ptr = NULL; |
2388 | int subvol_namelen; | |
93bc66f4 | 2389 | int ret = 0; |
949964c9 | 2390 | bool destroy_parent = false; |
76dda93c | 2391 | |
813febdb JB |
2392 | /* We don't support snapshots with extent tree v2 yet. */ |
2393 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { | |
2394 | btrfs_err(fs_info, | |
2395 | "extent tree v2 doesn't support snapshot deletion yet"); | |
2396 | return -EOPNOTSUPP; | |
2397 | } | |
2398 | ||
949964c9 MPS |
2399 | if (destroy_v2) { |
2400 | vol_args2 = memdup_user(arg, sizeof(*vol_args2)); | |
2401 | if (IS_ERR(vol_args2)) | |
2402 | return PTR_ERR(vol_args2); | |
325c50e3 | 2403 | |
949964c9 | 2404 | if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { |
93bc66f4 | 2405 | ret = -EOPNOTSUPP; |
949964c9 MPS |
2406 | goto out; |
2407 | } | |
76dda93c | 2408 | |
949964c9 MPS |
2409 | /* |
2410 | * If SPEC_BY_ID is not set, we are looking for the subvolume by | |
2411 | * name, same as v1 currently does. | |
2412 | */ | |
2413 | if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { | |
93bc66f4 AJ |
2414 | ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args2); |
2415 | if (ret < 0) | |
0478adff | 2416 | goto out; |
949964c9 MPS |
2417 | subvol_name = vol_args2->name; |
2418 | ||
93bc66f4 AJ |
2419 | ret = mnt_want_write_file(file); |
2420 | if (ret) | |
949964c9 MPS |
2421 | goto out; |
2422 | } else { | |
aabb34e7 | 2423 | struct inode *old_dir; |
c4ed533b | 2424 | |
949964c9 | 2425 | if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { |
93bc66f4 | 2426 | ret = -EINVAL; |
949964c9 MPS |
2427 | goto out; |
2428 | } | |
2429 | ||
93bc66f4 AJ |
2430 | ret = mnt_want_write_file(file); |
2431 | if (ret) | |
949964c9 MPS |
2432 | goto out; |
2433 | ||
2434 | dentry = btrfs_get_dentry(fs_info->sb, | |
2435 | BTRFS_FIRST_FREE_OBJECTID, | |
b307f06d | 2436 | vol_args2->subvolid, 0); |
949964c9 | 2437 | if (IS_ERR(dentry)) { |
93bc66f4 | 2438 | ret = PTR_ERR(dentry); |
949964c9 MPS |
2439 | goto out_drop_write; |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * Change the default parent since the subvolume being | |
2444 | * deleted can be outside of the current mount point. | |
2445 | */ | |
2446 | parent = btrfs_get_parent(dentry); | |
2447 | ||
2448 | /* | |
2449 | * At this point dentry->d_name can point to '/' if the | |
2450 | * subvolume we want to destroy is outsite of the | |
2451 | * current mount point, so we need to release the | |
2452 | * current dentry and execute the lookup to return a new | |
2453 | * one with ->d_name pointing to the | |
2454 | * <mount point>/subvol_name. | |
2455 | */ | |
2456 | dput(dentry); | |
2457 | if (IS_ERR(parent)) { | |
93bc66f4 | 2458 | ret = PTR_ERR(parent); |
949964c9 MPS |
2459 | goto out_drop_write; |
2460 | } | |
aabb34e7 | 2461 | old_dir = dir; |
949964c9 MPS |
2462 | dir = d_inode(parent); |
2463 | ||
2464 | /* | |
2465 | * If v2 was used with SPEC_BY_ID, a new parent was | |
2466 | * allocated since the subvolume can be outside of the | |
2467 | * current mount point. Later on we need to release this | |
2468 | * new parent dentry. | |
2469 | */ | |
2470 | destroy_parent = true; | |
2471 | ||
aabb34e7 CB |
2472 | /* |
2473 | * On idmapped mounts, deletion via subvolid is | |
2474 | * restricted to subvolumes that are immediate | |
2475 | * ancestors of the inode referenced by the file | |
2476 | * descriptor in the ioctl. Otherwise the idmapping | |
2477 | * could potentially be abused to delete subvolumes | |
2478 | * anywhere in the filesystem the user wouldn't be able | |
2479 | * to delete without an idmapped mount. | |
2480 | */ | |
4609e1f1 | 2481 | if (old_dir != dir && idmap != &nop_mnt_idmap) { |
93bc66f4 | 2482 | ret = -EOPNOTSUPP; |
aabb34e7 CB |
2483 | goto free_parent; |
2484 | } | |
2485 | ||
949964c9 MPS |
2486 | subvol_name_ptr = btrfs_get_subvol_name_from_objectid( |
2487 | fs_info, vol_args2->subvolid); | |
2488 | if (IS_ERR(subvol_name_ptr)) { | |
93bc66f4 | 2489 | ret = PTR_ERR(subvol_name_ptr); |
949964c9 MPS |
2490 | goto free_parent; |
2491 | } | |
1a9fd417 | 2492 | /* subvol_name_ptr is already nul terminated */ |
949964c9 MPS |
2493 | subvol_name = (char *)kbasename(subvol_name_ptr); |
2494 | } | |
2495 | } else { | |
2496 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
2497 | if (IS_ERR(vol_args)) | |
2498 | return PTR_ERR(vol_args); | |
2499 | ||
93bc66f4 AJ |
2500 | ret = btrfs_check_ioctl_vol_args_path(vol_args); |
2501 | if (ret < 0) | |
5ab2b180 DS |
2502 | goto out; |
2503 | ||
949964c9 MPS |
2504 | subvol_name = vol_args->name; |
2505 | ||
93bc66f4 AJ |
2506 | ret = mnt_want_write_file(file); |
2507 | if (ret) | |
949964c9 | 2508 | goto out; |
76dda93c YZ |
2509 | } |
2510 | ||
949964c9 | 2511 | subvol_namelen = strlen(subvol_name); |
76dda93c | 2512 | |
949964c9 MPS |
2513 | if (strchr(subvol_name, '/') || |
2514 | strncmp(subvol_name, "..", subvol_namelen) == 0) { | |
93bc66f4 | 2515 | ret = -EINVAL; |
949964c9 MPS |
2516 | goto free_subvol_name; |
2517 | } | |
2518 | ||
2519 | if (!S_ISDIR(dir->i_mode)) { | |
93bc66f4 | 2520 | ret = -ENOTDIR; |
949964c9 MPS |
2521 | goto free_subvol_name; |
2522 | } | |
521e0546 | 2523 | |
93bc66f4 AJ |
2524 | ret = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
2525 | if (ret == -EINTR) | |
949964c9 | 2526 | goto free_subvol_name; |
4609e1f1 | 2527 | dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen); |
76dda93c | 2528 | if (IS_ERR(dentry)) { |
93bc66f4 | 2529 | ret = PTR_ERR(dentry); |
76dda93c YZ |
2530 | goto out_unlock_dir; |
2531 | } | |
2532 | ||
2b0143b5 | 2533 | if (d_really_is_negative(dentry)) { |
93bc66f4 | 2534 | ret = -ENOENT; |
76dda93c YZ |
2535 | goto out_dput; |
2536 | } | |
2537 | ||
2b0143b5 | 2538 | inode = d_inode(dentry); |
4260f7c7 | 2539 | dest = BTRFS_I(inode)->root; |
67871254 | 2540 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2541 | /* |
2542 | * Regular user. Only allow this with a special mount | |
2543 | * option, when the user has write+exec access to the | |
2544 | * subvol root, and when rmdir(2) would have been | |
2545 | * allowed. | |
2546 | * | |
2547 | * Note that this is _not_ check that the subvol is | |
2548 | * empty or doesn't contain data that we wouldn't | |
2549 | * otherwise be able to delete. | |
2550 | * | |
2551 | * Users who want to delete empty subvols should try | |
2552 | * rmdir(2). | |
2553 | */ | |
93bc66f4 | 2554 | ret = -EPERM; |
0b246afa | 2555 | if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) |
4260f7c7 SW |
2556 | goto out_dput; |
2557 | ||
2558 | /* | |
2559 | * Do not allow deletion if the parent dir is the same | |
2560 | * as the dir to be deleted. That means the ioctl | |
2561 | * must be called on the dentry referencing the root | |
2562 | * of the subvol, not a random directory contained | |
2563 | * within it. | |
2564 | */ | |
93bc66f4 | 2565 | ret = -EINVAL; |
4260f7c7 SW |
2566 | if (root == dest) |
2567 | goto out_dput; | |
2568 | ||
93bc66f4 AJ |
2569 | ret = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC); |
2570 | if (ret) | |
4260f7c7 | 2571 | goto out_dput; |
4260f7c7 SW |
2572 | } |
2573 | ||
5c39da5b | 2574 | /* check if subvolume may be deleted by a user */ |
93bc66f4 AJ |
2575 | ret = btrfs_may_delete(idmap, dir, dentry, 1); |
2576 | if (ret) | |
5c39da5b MX |
2577 | goto out_dput; |
2578 | ||
4a0cc7ca | 2579 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
93bc66f4 | 2580 | ret = -EINVAL; |
76dda93c YZ |
2581 | goto out_dput; |
2582 | } | |
2583 | ||
29b6352b | 2584 | btrfs_inode_lock(BTRFS_I(inode), 0); |
93bc66f4 | 2585 | ret = btrfs_delete_subvolume(BTRFS_I(dir), dentry); |
e5d4d75b | 2586 | btrfs_inode_unlock(BTRFS_I(inode), 0); |
93bc66f4 | 2587 | if (!ret) |
a37d9a17 | 2588 | d_delete_notify(dir, dentry); |
fa6ac876 | 2589 | |
76dda93c YZ |
2590 | out_dput: |
2591 | dput(dentry); | |
2592 | out_unlock_dir: | |
e5d4d75b | 2593 | btrfs_inode_unlock(BTRFS_I(dir), 0); |
949964c9 MPS |
2594 | free_subvol_name: |
2595 | kfree(subvol_name_ptr); | |
2596 | free_parent: | |
2597 | if (destroy_parent) | |
2598 | dput(parent); | |
00235411 | 2599 | out_drop_write: |
2a79f17e | 2600 | mnt_drop_write_file(file); |
76dda93c | 2601 | out: |
949964c9 | 2602 | kfree(vol_args2); |
76dda93c | 2603 | kfree(vol_args); |
93bc66f4 | 2604 | return ret; |
76dda93c YZ |
2605 | } |
2606 | ||
1e701a32 | 2607 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2608 | { |
496ad9aa | 2609 | struct inode *inode = file_inode(file); |
f46b5a66 | 2610 | struct btrfs_root *root = BTRFS_I(inode)->root; |
c853a578 | 2611 | struct btrfs_ioctl_defrag_range_args range = {0}; |
c146afad YZ |
2612 | int ret; |
2613 | ||
25122d15 ID |
2614 | ret = mnt_want_write_file(file); |
2615 | if (ret) | |
2616 | return ret; | |
b83cc969 | 2617 | |
25122d15 ID |
2618 | if (btrfs_root_readonly(root)) { |
2619 | ret = -EROFS; | |
2620 | goto out; | |
5ac00add | 2621 | } |
f46b5a66 CH |
2622 | |
2623 | switch (inode->i_mode & S_IFMT) { | |
2624 | case S_IFDIR: | |
e441d54d CM |
2625 | if (!capable(CAP_SYS_ADMIN)) { |
2626 | ret = -EPERM; | |
2627 | goto out; | |
2628 | } | |
de78b51a | 2629 | ret = btrfs_defrag_root(root); |
f46b5a66 CH |
2630 | break; |
2631 | case S_IFREG: | |
616d374e AB |
2632 | /* |
2633 | * Note that this does not check the file descriptor for write | |
2634 | * access. This prevents defragmenting executables that are | |
2635 | * running and allows defrag on files open in read-only mode. | |
2636 | */ | |
2637 | if (!capable(CAP_SYS_ADMIN) && | |
4609e1f1 | 2638 | inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) { |
616d374e | 2639 | ret = -EPERM; |
e441d54d CM |
2640 | goto out; |
2641 | } | |
1e701a32 | 2642 | |
1e701a32 | 2643 | if (argp) { |
c853a578 | 2644 | if (copy_from_user(&range, argp, sizeof(range))) { |
1e701a32 | 2645 | ret = -EFAULT; |
683be16e | 2646 | goto out; |
1e701a32 | 2647 | } |
173431b2 QW |
2648 | if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) { |
2649 | ret = -EOPNOTSUPP; | |
2650 | goto out; | |
2651 | } | |
1e701a32 | 2652 | /* compression requires us to start the IO */ |
c853a578 GR |
2653 | if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
2654 | range.flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2655 | range.extent_thresh = (u32)-1; | |
1e701a32 CM |
2656 | } |
2657 | } else { | |
2658 | /* the rest are all set to zero by kzalloc */ | |
c853a578 | 2659 | range.len = (u64)-1; |
1e701a32 | 2660 | } |
1ccc2e8a | 2661 | ret = btrfs_defrag_file(file_inode(file), &file->f_ra, |
c853a578 | 2662 | &range, BTRFS_OLDEST_GENERATION, 0); |
4cb5300b CM |
2663 | if (ret > 0) |
2664 | ret = 0; | |
f46b5a66 | 2665 | break; |
8929ecfa YZ |
2666 | default: |
2667 | ret = -EINVAL; | |
f46b5a66 | 2668 | } |
e441d54d | 2669 | out: |
25122d15 | 2670 | mnt_drop_write_file(file); |
e441d54d | 2671 | return ret; |
f46b5a66 CH |
2672 | } |
2673 | ||
2ff7e61e | 2674 | static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) |
f46b5a66 CH |
2675 | { |
2676 | struct btrfs_ioctl_vol_args *vol_args; | |
a174c0a2 | 2677 | bool restore_op = false; |
f46b5a66 CH |
2678 | int ret; |
2679 | ||
e441d54d CM |
2680 | if (!capable(CAP_SYS_ADMIN)) |
2681 | return -EPERM; | |
2682 | ||
914a519b JB |
2683 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
2684 | btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); | |
2685 | return -EINVAL; | |
2686 | } | |
2687 | ||
ac6ea6a9 AJ |
2688 | if (fs_info->fs_devices->temp_fsid) { |
2689 | btrfs_err(fs_info, | |
2690 | "device add not supported on cloned temp-fsid mount"); | |
2691 | return -EINVAL; | |
2692 | } | |
2693 | ||
a174c0a2 NB |
2694 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { |
2695 | if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) | |
2696 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2697 | ||
2698 | /* | |
2699 | * We can do the device add because we have a paused balanced, | |
2700 | * change the exclusive op type and remember we should bring | |
2701 | * back the paused balance | |
2702 | */ | |
2703 | fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; | |
2704 | btrfs_exclop_start_unlock(fs_info); | |
2705 | restore_op = true; | |
2706 | } | |
c9e9f97b | 2707 | |
dae7b665 | 2708 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2709 | if (IS_ERR(vol_args)) { |
2710 | ret = PTR_ERR(vol_args); | |
2711 | goto out; | |
2712 | } | |
f46b5a66 | 2713 | |
5ab2b180 DS |
2714 | ret = btrfs_check_ioctl_vol_args_path(vol_args); |
2715 | if (ret < 0) | |
2716 | goto out_free; | |
2717 | ||
2ff7e61e | 2718 | ret = btrfs_init_new_device(fs_info, vol_args->name); |
f46b5a66 | 2719 | |
43d20761 | 2720 | if (!ret) |
0b246afa | 2721 | btrfs_info(fs_info, "disk added %s", vol_args->name); |
43d20761 | 2722 | |
5ab2b180 | 2723 | out_free: |
f46b5a66 | 2724 | kfree(vol_args); |
c9e9f97b | 2725 | out: |
a174c0a2 NB |
2726 | if (restore_op) |
2727 | btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); | |
2728 | else | |
2729 | btrfs_exclop_finish(fs_info); | |
f46b5a66 CH |
2730 | return ret; |
2731 | } | |
2732 | ||
6b526ed7 | 2733 | static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) |
f46b5a66 | 2734 | { |
1a15eb72 | 2735 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa | 2736 | struct inode *inode = file_inode(file); |
41044b41 | 2737 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
6b526ed7 | 2738 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
9ae061cf | 2739 | struct file *bdev_file = NULL; |
f46b5a66 | 2740 | int ret; |
67ae34b6 | 2741 | bool cancel = false; |
f46b5a66 | 2742 | |
e441d54d CM |
2743 | if (!capable(CAP_SYS_ADMIN)) |
2744 | return -EPERM; | |
2745 | ||
dae7b665 | 2746 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
d815b3f2 DC |
2747 | if (IS_ERR(vol_args)) |
2748 | return PTR_ERR(vol_args); | |
f46b5a66 | 2749 | |
748449cd | 2750 | if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { |
fd4e994b OS |
2751 | ret = -EOPNOTSUPP; |
2752 | goto out; | |
2753 | } | |
1a15eb72 | 2754 | |
0478adff DS |
2755 | ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args); |
2756 | if (ret < 0) | |
2757 | goto out; | |
2758 | ||
1a15eb72 JB |
2759 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { |
2760 | args.devid = vol_args->devid; | |
2761 | } else if (!strcmp("cancel", vol_args->name)) { | |
67ae34b6 | 2762 | cancel = true; |
1a15eb72 JB |
2763 | } else { |
2764 | ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); | |
2765 | if (ret) | |
2766 | goto out; | |
2767 | } | |
2768 | ||
2769 | ret = mnt_want_write_file(file); | |
2770 | if (ret) | |
2771 | goto out; | |
f46b5a66 | 2772 | |
67ae34b6 DS |
2773 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, |
2774 | cancel); | |
2775 | if (ret) | |
1a15eb72 | 2776 | goto err_drop; |
183860f6 | 2777 | |
1a15eb72 | 2778 | /* Exclusive operation is now claimed */ |
9ae061cf | 2779 | ret = btrfs_rm_device(fs_info, &args, &bdev_file); |
67ae34b6 | 2780 | |
c3e1f96c | 2781 | btrfs_exclop_finish(fs_info); |
183860f6 | 2782 | |
6b526ed7 | 2783 | if (!ret) { |
735654ea | 2784 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
0b246afa | 2785 | btrfs_info(fs_info, "device deleted: id %llu", |
6b526ed7 AJ |
2786 | vol_args->devid); |
2787 | else | |
0b246afa | 2788 | btrfs_info(fs_info, "device deleted: %s", |
6b526ed7 AJ |
2789 | vol_args->name); |
2790 | } | |
c47ca32d | 2791 | err_drop: |
4ac20c70 | 2792 | mnt_drop_write_file(file); |
9ae061cf CB |
2793 | if (bdev_file) |
2794 | fput(bdev_file); | |
1a15eb72 JB |
2795 | out: |
2796 | btrfs_put_dev_args_from_path(&args); | |
2797 | kfree(vol_args); | |
f46b5a66 CH |
2798 | return ret; |
2799 | } | |
2800 | ||
da24927b | 2801 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2802 | { |
1a15eb72 | 2803 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa | 2804 | struct inode *inode = file_inode(file); |
41044b41 | 2805 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
f46b5a66 | 2806 | struct btrfs_ioctl_vol_args *vol_args; |
9ae061cf | 2807 | struct file *bdev_file = NULL; |
f46b5a66 | 2808 | int ret; |
37b45995 | 2809 | bool cancel = false; |
f46b5a66 | 2810 | |
e441d54d CM |
2811 | if (!capable(CAP_SYS_ADMIN)) |
2812 | return -EPERM; | |
2813 | ||
58d7bbf8 | 2814 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1a15eb72 JB |
2815 | if (IS_ERR(vol_args)) |
2816 | return PTR_ERR(vol_args); | |
2817 | ||
5ab2b180 DS |
2818 | ret = btrfs_check_ioctl_vol_args_path(vol_args); |
2819 | if (ret < 0) | |
2820 | goto out_free; | |
2821 | ||
1a15eb72 JB |
2822 | if (!strcmp("cancel", vol_args->name)) { |
2823 | cancel = true; | |
2824 | } else { | |
2825 | ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); | |
2826 | if (ret) | |
2827 | goto out; | |
2828 | } | |
2829 | ||
2830 | ret = mnt_want_write_file(file); | |
2831 | if (ret) | |
2832 | goto out; | |
67ae34b6 DS |
2833 | |
2834 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, | |
2835 | cancel); | |
2836 | if (ret == 0) { | |
9ae061cf | 2837 | ret = btrfs_rm_device(fs_info, &args, &bdev_file); |
67ae34b6 DS |
2838 | if (!ret) |
2839 | btrfs_info(fs_info, "disk deleted %s", vol_args->name); | |
2840 | btrfs_exclop_finish(fs_info); | |
2841 | } | |
183860f6 | 2842 | |
4ac20c70 | 2843 | mnt_drop_write_file(file); |
9ae061cf CB |
2844 | if (bdev_file) |
2845 | fput(bdev_file); | |
1a15eb72 JB |
2846 | out: |
2847 | btrfs_put_dev_args_from_path(&args); | |
5ab2b180 | 2848 | out_free: |
1a15eb72 | 2849 | kfree(vol_args); |
f46b5a66 CH |
2850 | return ret; |
2851 | } | |
2852 | ||
2ff7e61e JM |
2853 | static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, |
2854 | void __user *arg) | |
475f6387 | 2855 | { |
027ed2f0 | 2856 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 2857 | struct btrfs_device *device; |
0b246afa | 2858 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
137c5418 | 2859 | u64 flags_in; |
027ed2f0 | 2860 | int ret = 0; |
475f6387 | 2861 | |
137c5418 JT |
2862 | fi_args = memdup_user(arg, sizeof(*fi_args)); |
2863 | if (IS_ERR(fi_args)) | |
2864 | return PTR_ERR(fi_args); | |
2865 | ||
2866 | flags_in = fi_args->flags; | |
2867 | memset(fi_args, 0, sizeof(*fi_args)); | |
027ed2f0 | 2868 | |
d03262c7 | 2869 | rcu_read_lock(); |
027ed2f0 | 2870 | fi_args->num_devices = fs_devices->num_devices; |
475f6387 | 2871 | |
d03262c7 | 2872 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2873 | if (device->devid > fi_args->max_id) |
2874 | fi_args->max_id = device->devid; | |
475f6387 | 2875 | } |
d03262c7 | 2876 | rcu_read_unlock(); |
475f6387 | 2877 | |
de37aa51 | 2878 | memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); |
bea7eafd OS |
2879 | fi_args->nodesize = fs_info->nodesize; |
2880 | fi_args->sectorsize = fs_info->sectorsize; | |
2881 | fi_args->clone_alignment = fs_info->sectorsize; | |
80a773fb | 2882 | |
137c5418 JT |
2883 | if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { |
2884 | fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
2885 | fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2886 | fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; | |
2887 | } | |
2888 | ||
0fb408a5 | 2889 | if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { |
4a4f8fe2 | 2890 | fi_args->generation = btrfs_get_fs_generation(fs_info); |
0fb408a5 JT |
2891 | fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; |
2892 | } | |
2893 | ||
49bac897 JT |
2894 | if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { |
2895 | memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, | |
2896 | sizeof(fi_args->metadata_uuid)); | |
2897 | fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; | |
2898 | } | |
2899 | ||
027ed2f0 LZ |
2900 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2901 | ret = -EFAULT; | |
475f6387 | 2902 | |
027ed2f0 LZ |
2903 | kfree(fi_args); |
2904 | return ret; | |
475f6387 JS |
2905 | } |
2906 | ||
2ff7e61e JM |
2907 | static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, |
2908 | void __user *arg) | |
475f6387 | 2909 | { |
562d7b15 | 2910 | BTRFS_DEV_LOOKUP_ARGS(args); |
475f6387 JS |
2911 | struct btrfs_ioctl_dev_info_args *di_args; |
2912 | struct btrfs_device *dev; | |
475f6387 | 2913 | int ret = 0; |
475f6387 | 2914 | |
475f6387 JS |
2915 | di_args = memdup_user(arg, sizeof(*di_args)); |
2916 | if (IS_ERR(di_args)) | |
2917 | return PTR_ERR(di_args); | |
2918 | ||
562d7b15 | 2919 | args.devid = di_args->devid; |
dd5f9615 | 2920 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
562d7b15 | 2921 | args.uuid = di_args->uuid; |
475f6387 | 2922 | |
c5593ca3 | 2923 | rcu_read_lock(); |
562d7b15 | 2924 | dev = btrfs_find_device(fs_info->fs_devices, &args); |
475f6387 JS |
2925 | if (!dev) { |
2926 | ret = -ENODEV; | |
2927 | goto out; | |
2928 | } | |
2929 | ||
2930 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2931 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2932 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2933 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
2943868a | 2934 | memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
63d5429f AC |
2935 | if (dev->name) |
2936 | strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); | |
2937 | else | |
99ba55ad | 2938 | di_args->path[0] = '\0'; |
475f6387 JS |
2939 | |
2940 | out: | |
c5593ca3 | 2941 | rcu_read_unlock(); |
475f6387 JS |
2942 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2943 | ret = -EFAULT; | |
2944 | ||
2945 | kfree(di_args); | |
2946 | return ret; | |
2947 | } | |
2948 | ||
6ef5ed0d JB |
2949 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2950 | { | |
496ad9aa | 2951 | struct inode *inode = file_inode(file); |
41044b41 | 2952 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
6ef5ed0d JB |
2953 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2954 | struct btrfs_root *new_root; | |
2955 | struct btrfs_dir_item *di; | |
2956 | struct btrfs_trans_handle *trans; | |
2a2b5d62 | 2957 | struct btrfs_path *path = NULL; |
6ef5ed0d | 2958 | struct btrfs_disk_key disk_key; |
6db75318 | 2959 | struct fscrypt_str name = FSTR_INIT("default", 7); |
6ef5ed0d JB |
2960 | u64 objectid = 0; |
2961 | u64 dir_id; | |
3c04ce01 | 2962 | int ret; |
6ef5ed0d JB |
2963 | |
2964 | if (!capable(CAP_SYS_ADMIN)) | |
2965 | return -EPERM; | |
2966 | ||
3c04ce01 MX |
2967 | ret = mnt_want_write_file(file); |
2968 | if (ret) | |
2969 | return ret; | |
2970 | ||
2971 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
2972 | ret = -EFAULT; | |
2973 | goto out; | |
2974 | } | |
6ef5ed0d JB |
2975 | |
2976 | if (!objectid) | |
1cecf579 | 2977 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d | 2978 | |
56e9357a | 2979 | new_root = btrfs_get_fs_root(fs_info, objectid, true); |
3c04ce01 MX |
2980 | if (IS_ERR(new_root)) { |
2981 | ret = PTR_ERR(new_root); | |
2982 | goto out; | |
2983 | } | |
e094f480 | 2984 | if (!is_fstree(btrfs_root_id(new_root))) { |
2a2b5d62 JB |
2985 | ret = -ENOENT; |
2986 | goto out_free; | |
2987 | } | |
6ef5ed0d | 2988 | |
6ef5ed0d | 2989 | path = btrfs_alloc_path(); |
3c04ce01 MX |
2990 | if (!path) { |
2991 | ret = -ENOMEM; | |
2a2b5d62 | 2992 | goto out_free; |
3c04ce01 | 2993 | } |
6ef5ed0d JB |
2994 | |
2995 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2996 | if (IS_ERR(trans)) { |
3c04ce01 | 2997 | ret = PTR_ERR(trans); |
2a2b5d62 | 2998 | goto out_free; |
6ef5ed0d JB |
2999 | } |
3000 | ||
0b246afa JM |
3001 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
3002 | di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, | |
e43eec81 | 3003 | dir_id, &name, 1); |
cf1e99a4 | 3004 | if (IS_ERR_OR_NULL(di)) { |
2a2b5d62 | 3005 | btrfs_release_path(path); |
3a45bb20 | 3006 | btrfs_end_transaction(trans); |
0b246afa | 3007 | btrfs_err(fs_info, |
5d163e0e | 3008 | "Umm, you don't have the default diritem, this isn't going to work"); |
3c04ce01 | 3009 | ret = -ENOENT; |
2a2b5d62 | 3010 | goto out_free; |
6ef5ed0d JB |
3011 | } |
3012 | ||
3013 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3014 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
50564b65 | 3015 | btrfs_mark_buffer_dirty(trans, path->nodes[0]); |
2a2b5d62 | 3016 | btrfs_release_path(path); |
6ef5ed0d | 3017 | |
0b246afa | 3018 | btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); |
3a45bb20 | 3019 | btrfs_end_transaction(trans); |
2a2b5d62 | 3020 | out_free: |
00246528 | 3021 | btrfs_put_root(new_root); |
2a2b5d62 | 3022 | btrfs_free_path(path); |
3c04ce01 MX |
3023 | out: |
3024 | mnt_drop_write_file(file); | |
3025 | return ret; | |
6ef5ed0d JB |
3026 | } |
3027 | ||
c065f5b1 SY |
3028 | static void get_block_group_info(struct list_head *groups_list, |
3029 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 | 3030 | { |
32da5386 | 3031 | struct btrfs_block_group *block_group; |
bf5fc093 JB |
3032 | |
3033 | space->total_bytes = 0; | |
3034 | space->used_bytes = 0; | |
3035 | space->flags = 0; | |
3036 | list_for_each_entry(block_group, groups_list, list) { | |
3037 | space->flags = block_group->flags; | |
b3470b5d | 3038 | space->total_bytes += block_group->length; |
bf38be65 | 3039 | space->used_bytes += block_group->used; |
bf5fc093 JB |
3040 | } |
3041 | } | |
3042 | ||
2ff7e61e JM |
3043 | static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, |
3044 | void __user *arg) | |
1406e432 | 3045 | { |
9147b9de | 3046 | struct btrfs_ioctl_space_args space_args = { 0 }; |
1406e432 JB |
3047 | struct btrfs_ioctl_space_info space; |
3048 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3049 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3050 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3051 | struct btrfs_space_info *info; |
315d8e98 CIK |
3052 | static const u64 types[] = { |
3053 | BTRFS_BLOCK_GROUP_DATA, | |
3054 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3055 | BTRFS_BLOCK_GROUP_METADATA, | |
3056 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA | |
3057 | }; | |
bf5fc093 | 3058 | int num_types = 4; |
7fde62bf | 3059 | int alloc_size; |
1406e432 | 3060 | int ret = 0; |
51788b1b | 3061 | u64 slot_count = 0; |
bf5fc093 | 3062 | int i, c; |
1406e432 JB |
3063 | |
3064 | if (copy_from_user(&space_args, | |
3065 | (struct btrfs_ioctl_space_args __user *)arg, | |
3066 | sizeof(space_args))) | |
3067 | return -EFAULT; | |
3068 | ||
bf5fc093 JB |
3069 | for (i = 0; i < num_types; i++) { |
3070 | struct btrfs_space_info *tmp; | |
3071 | ||
3072 | info = NULL; | |
72804905 | 3073 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3074 | if (tmp->flags == types[i]) { |
3075 | info = tmp; | |
3076 | break; | |
3077 | } | |
3078 | } | |
bf5fc093 JB |
3079 | |
3080 | if (!info) | |
3081 | continue; | |
3082 | ||
3083 | down_read(&info->groups_sem); | |
3084 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3085 | if (!list_empty(&info->block_groups[c])) | |
3086 | slot_count++; | |
3087 | } | |
3088 | up_read(&info->groups_sem); | |
3089 | } | |
7fde62bf | 3090 | |
36523e95 DS |
3091 | /* |
3092 | * Global block reserve, exported as a space_info | |
3093 | */ | |
3094 | slot_count++; | |
3095 | ||
7fde62bf CM |
3096 | /* space_slots == 0 means they are asking for a count */ |
3097 | if (space_args.space_slots == 0) { | |
3098 | space_args.total_spaces = slot_count; | |
3099 | goto out; | |
3100 | } | |
bf5fc093 | 3101 | |
51788b1b | 3102 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3103 | |
7fde62bf | 3104 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3105 | |
7fde62bf CM |
3106 | /* we generally have at most 6 or so space infos, one for each raid |
3107 | * level. So, a whole page should be more than enough for everyone | |
3108 | */ | |
09cbfeaf | 3109 | if (alloc_size > PAGE_SIZE) |
7fde62bf CM |
3110 | return -ENOMEM; |
3111 | ||
1406e432 | 3112 | space_args.total_spaces = 0; |
8d2db785 | 3113 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
3114 | if (!dest) |
3115 | return -ENOMEM; | |
3116 | dest_orig = dest; | |
1406e432 | 3117 | |
7fde62bf | 3118 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3119 | for (i = 0; i < num_types; i++) { |
3120 | struct btrfs_space_info *tmp; | |
3121 | ||
51788b1b DR |
3122 | if (!slot_count) |
3123 | break; | |
3124 | ||
bf5fc093 | 3125 | info = NULL; |
72804905 | 3126 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3127 | if (tmp->flags == types[i]) { |
3128 | info = tmp; | |
3129 | break; | |
3130 | } | |
3131 | } | |
7fde62bf | 3132 | |
bf5fc093 JB |
3133 | if (!info) |
3134 | continue; | |
3135 | down_read(&info->groups_sem); | |
3136 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3137 | if (!list_empty(&info->block_groups[c])) { | |
c065f5b1 SY |
3138 | get_block_group_info(&info->block_groups[c], |
3139 | &space); | |
bf5fc093 JB |
3140 | memcpy(dest, &space, sizeof(space)); |
3141 | dest++; | |
3142 | space_args.total_spaces++; | |
51788b1b | 3143 | slot_count--; |
bf5fc093 | 3144 | } |
51788b1b DR |
3145 | if (!slot_count) |
3146 | break; | |
bf5fc093 JB |
3147 | } |
3148 | up_read(&info->groups_sem); | |
1406e432 | 3149 | } |
1406e432 | 3150 | |
36523e95 DS |
3151 | /* |
3152 | * Add global block reserve | |
3153 | */ | |
3154 | if (slot_count) { | |
0b246afa | 3155 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
36523e95 DS |
3156 | |
3157 | spin_lock(&block_rsv->lock); | |
3158 | space.total_bytes = block_rsv->size; | |
3159 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
3160 | spin_unlock(&block_rsv->lock); | |
3161 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
3162 | memcpy(dest, &space, sizeof(space)); | |
3163 | space_args.total_spaces++; | |
3164 | } | |
3165 | ||
2eec6c81 | 3166 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3167 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3168 | ||
3169 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3170 | ret = -EFAULT; | |
3171 | ||
3172 | kfree(dest_orig); | |
3173 | out: | |
3174 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3175 | ret = -EFAULT; |
3176 | ||
3177 | return ret; | |
3178 | } | |
3179 | ||
9a8c28be MX |
3180 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3181 | void __user *argp) | |
46204592 | 3182 | { |
46204592 SW |
3183 | struct btrfs_trans_handle *trans; |
3184 | u64 transid; | |
3185 | ||
edc72881 QW |
3186 | /* |
3187 | * Start orphan cleanup here for the given root in case it hasn't been | |
3188 | * started already by other means. Errors are handled in the other | |
3189 | * functions during transaction commit. | |
3190 | */ | |
3191 | btrfs_orphan_cleanup(root); | |
3192 | ||
d4edf39b | 3193 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3194 | if (IS_ERR(trans)) { |
3195 | if (PTR_ERR(trans) != -ENOENT) | |
3196 | return PTR_ERR(trans); | |
3197 | ||
3198 | /* No running transaction, don't bother */ | |
0124855f | 3199 | transid = btrfs_get_last_trans_committed(root->fs_info); |
ff7c1d33 MX |
3200 | goto out; |
3201 | } | |
46204592 | 3202 | transid = trans->transid; |
fdfbf020 | 3203 | btrfs_commit_transaction_async(trans); |
ff7c1d33 | 3204 | out: |
46204592 SW |
3205 | if (argp) |
3206 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3207 | return -EFAULT; | |
3208 | return 0; | |
3209 | } | |
3210 | ||
2ff7e61e | 3211 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, |
9a8c28be | 3212 | void __user *argp) |
46204592 | 3213 | { |
12df6a62 TR |
3214 | /* By default wait for the current transaction. */ |
3215 | u64 transid = 0; | |
46204592 | 3216 | |
12df6a62 | 3217 | if (argp) |
46204592 SW |
3218 | if (copy_from_user(&transid, argp, sizeof(transid))) |
3219 | return -EFAULT; | |
12df6a62 | 3220 | |
2ff7e61e | 3221 | return btrfs_wait_for_commit(fs_info, transid); |
46204592 SW |
3222 | } |
3223 | ||
b8e95489 | 3224 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3225 | { |
41044b41 | 3226 | struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file)); |
475f6387 | 3227 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3228 | int ret; |
475f6387 JS |
3229 | |
3230 | if (!capable(CAP_SYS_ADMIN)) | |
3231 | return -EPERM; | |
3232 | ||
da32c6d5 JB |
3233 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
3234 | btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); | |
3235 | return -EINVAL; | |
3236 | } | |
3237 | ||
475f6387 JS |
3238 | sa = memdup_user(arg, sizeof(*sa)); |
3239 | if (IS_ERR(sa)) | |
3240 | return PTR_ERR(sa); | |
3241 | ||
604e6681 QW |
3242 | if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) { |
3243 | ret = -EOPNOTSUPP; | |
3244 | goto out; | |
3245 | } | |
3246 | ||
b8e95489 MX |
3247 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3248 | ret = mnt_want_write_file(file); | |
3249 | if (ret) | |
3250 | goto out; | |
3251 | } | |
3252 | ||
0b246afa | 3253 | ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3254 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3255 | 0); | |
475f6387 | 3256 | |
5afe6ce7 FM |
3257 | /* |
3258 | * Copy scrub args to user space even if btrfs_scrub_dev() returned an | |
3259 | * error. This is important as it allows user space to know how much | |
3260 | * progress scrub has done. For example, if scrub is canceled we get | |
3261 | * -ECANCELED from btrfs_scrub_dev() and return that error back to user | |
3262 | * space. Later user space can inspect the progress from the structure | |
3263 | * btrfs_ioctl_scrub_args and resume scrub from where it left off | |
3264 | * previously (btrfs-progs does this). | |
3265 | * If we fail to copy the btrfs_ioctl_scrub_args structure to user space | |
3266 | * then return -EFAULT to signal the structure was not copied or it may | |
3267 | * be corrupt and unreliable due to a partial copy. | |
3268 | */ | |
3269 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
475f6387 JS |
3270 | ret = -EFAULT; |
3271 | ||
b8e95489 MX |
3272 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3273 | mnt_drop_write_file(file); | |
3274 | out: | |
475f6387 JS |
3275 | kfree(sa); |
3276 | return ret; | |
3277 | } | |
3278 | ||
2ff7e61e | 3279 | static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) |
475f6387 JS |
3280 | { |
3281 | if (!capable(CAP_SYS_ADMIN)) | |
3282 | return -EPERM; | |
3283 | ||
2ff7e61e | 3284 | return btrfs_scrub_cancel(fs_info); |
475f6387 JS |
3285 | } |
3286 | ||
2ff7e61e | 3287 | static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, |
475f6387 JS |
3288 | void __user *arg) |
3289 | { | |
3290 | struct btrfs_ioctl_scrub_args *sa; | |
3291 | int ret; | |
3292 | ||
3293 | if (!capable(CAP_SYS_ADMIN)) | |
3294 | return -EPERM; | |
3295 | ||
3296 | sa = memdup_user(arg, sizeof(*sa)); | |
3297 | if (IS_ERR(sa)) | |
3298 | return PTR_ERR(sa); | |
3299 | ||
2ff7e61e | 3300 | ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); |
475f6387 | 3301 | |
4fa99b00 | 3302 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
475f6387 JS |
3303 | ret = -EFAULT; |
3304 | ||
3305 | kfree(sa); | |
3306 | return ret; | |
3307 | } | |
3308 | ||
2ff7e61e | 3309 | static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, |
b27f7c0c | 3310 | void __user *arg) |
c11d2c23 SB |
3311 | { |
3312 | struct btrfs_ioctl_get_dev_stats *sa; | |
3313 | int ret; | |
3314 | ||
c11d2c23 SB |
3315 | sa = memdup_user(arg, sizeof(*sa)); |
3316 | if (IS_ERR(sa)) | |
3317 | return PTR_ERR(sa); | |
3318 | ||
b27f7c0c DS |
3319 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3320 | kfree(sa); | |
3321 | return -EPERM; | |
3322 | } | |
3323 | ||
2ff7e61e | 3324 | ret = btrfs_get_dev_stats(fs_info, sa); |
c11d2c23 | 3325 | |
eee99577 | 3326 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
c11d2c23 SB |
3327 | ret = -EFAULT; |
3328 | ||
3329 | kfree(sa); | |
3330 | return ret; | |
3331 | } | |
3332 | ||
2ff7e61e JM |
3333 | static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, |
3334 | void __user *arg) | |
3f6bcfbd SB |
3335 | { |
3336 | struct btrfs_ioctl_dev_replace_args *p; | |
3337 | int ret; | |
3338 | ||
3339 | if (!capable(CAP_SYS_ADMIN)) | |
3340 | return -EPERM; | |
3341 | ||
914a519b JB |
3342 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
3343 | btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); | |
3344 | return -EINVAL; | |
3345 | } | |
3346 | ||
3f6bcfbd SB |
3347 | p = memdup_user(arg, sizeof(*p)); |
3348 | if (IS_ERR(p)) | |
3349 | return PTR_ERR(p); | |
3350 | ||
3351 | switch (p->cmd) { | |
3352 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
bc98a42c | 3353 | if (sb_rdonly(fs_info->sb)) { |
adfa97cb ID |
3354 | ret = -EROFS; |
3355 | goto out; | |
3356 | } | |
c3e1f96c | 3357 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
e57138b3 | 3358 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd | 3359 | } else { |
2ff7e61e | 3360 | ret = btrfs_dev_replace_by_ioctl(fs_info, p); |
c3e1f96c | 3361 | btrfs_exclop_finish(fs_info); |
3f6bcfbd SB |
3362 | } |
3363 | break; | |
3364 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
0b246afa | 3365 | btrfs_dev_replace_status(fs_info, p); |
3f6bcfbd SB |
3366 | ret = 0; |
3367 | break; | |
3368 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
17d202b9 | 3369 | p->result = btrfs_dev_replace_cancel(fs_info); |
97282031 | 3370 | ret = 0; |
3f6bcfbd SB |
3371 | break; |
3372 | default: | |
3373 | ret = -EINVAL; | |
3374 | break; | |
3375 | } | |
3376 | ||
d3a53286 | 3377 | if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) |
3f6bcfbd | 3378 | ret = -EFAULT; |
adfa97cb | 3379 | out: |
3f6bcfbd SB |
3380 | kfree(p); |
3381 | return ret; | |
3382 | } | |
3383 | ||
d7728c96 JS |
3384 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3385 | { | |
3386 | int ret = 0; | |
3387 | int i; | |
740c3d22 | 3388 | u64 rel_ptr; |
d7728c96 | 3389 | int size; |
806468f8 | 3390 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3391 | struct inode_fs_paths *ipath = NULL; |
3392 | struct btrfs_path *path; | |
3393 | ||
82b22ac8 | 3394 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3395 | return -EPERM; |
3396 | ||
3397 | path = btrfs_alloc_path(); | |
3398 | if (!path) { | |
3399 | ret = -ENOMEM; | |
3400 | goto out; | |
3401 | } | |
3402 | ||
3403 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3404 | if (IS_ERR(ipa)) { | |
3405 | ret = PTR_ERR(ipa); | |
3406 | ipa = NULL; | |
3407 | goto out; | |
3408 | } | |
3409 | ||
3410 | size = min_t(u32, ipa->size, 4096); | |
3411 | ipath = init_ipath(size, root, path); | |
3412 | if (IS_ERR(ipath)) { | |
3413 | ret = PTR_ERR(ipath); | |
3414 | ipath = NULL; | |
3415 | goto out; | |
3416 | } | |
3417 | ||
3418 | ret = paths_from_inode(ipa->inum, ipath); | |
3419 | if (ret < 0) | |
3420 | goto out; | |
3421 | ||
3422 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3423 | rel_ptr = ipath->fspath->val[i] - |
3424 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3425 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3426 | } |
3427 | ||
8cf96b40 AJ |
3428 | btrfs_free_path(path); |
3429 | path = NULL; | |
718dc5fa OS |
3430 | ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, |
3431 | ipath->fspath, size); | |
d7728c96 JS |
3432 | if (ret) { |
3433 | ret = -EFAULT; | |
3434 | goto out; | |
3435 | } | |
3436 | ||
3437 | out: | |
3438 | btrfs_free_path(path); | |
3439 | free_ipath(ipath); | |
3440 | kfree(ipa); | |
3441 | ||
3442 | return ret; | |
3443 | } | |
3444 | ||
2ff7e61e | 3445 | static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, |
d24a67b2 | 3446 | void __user *arg, int version) |
d7728c96 JS |
3447 | { |
3448 | int ret = 0; | |
3449 | int size; | |
d7728c96 JS |
3450 | struct btrfs_ioctl_logical_ino_args *loi; |
3451 | struct btrfs_data_container *inodes = NULL; | |
3452 | struct btrfs_path *path = NULL; | |
d24a67b2 | 3453 | bool ignore_offset; |
d7728c96 JS |
3454 | |
3455 | if (!capable(CAP_SYS_ADMIN)) | |
3456 | return -EPERM; | |
3457 | ||
3458 | loi = memdup_user(arg, sizeof(*loi)); | |
7b9ea627 SV |
3459 | if (IS_ERR(loi)) |
3460 | return PTR_ERR(loi); | |
d7728c96 | 3461 | |
d24a67b2 ZB |
3462 | if (version == 1) { |
3463 | ignore_offset = false; | |
b115e3bc | 3464 | size = min_t(u32, loi->size, SZ_64K); |
d24a67b2 ZB |
3465 | } else { |
3466 | /* All reserved bits must be 0 for now */ | |
3467 | if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { | |
3468 | ret = -EINVAL; | |
3469 | goto out_loi; | |
3470 | } | |
3471 | /* Only accept flags we have defined so far */ | |
3472 | if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { | |
3473 | ret = -EINVAL; | |
3474 | goto out_loi; | |
3475 | } | |
3476 | ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; | |
b115e3bc | 3477 | size = min_t(u32, loi->size, SZ_16M); |
d24a67b2 ZB |
3478 | } |
3479 | ||
d7728c96 JS |
3480 | inodes = init_data_container(size); |
3481 | if (IS_ERR(inodes)) { | |
3482 | ret = PTR_ERR(inodes); | |
418ffb9e | 3483 | goto out_loi; |
d7728c96 JS |
3484 | } |
3485 | ||
418ffb9e AJ |
3486 | path = btrfs_alloc_path(); |
3487 | if (!path) { | |
3488 | ret = -ENOMEM; | |
3489 | goto out; | |
3490 | } | |
2ff7e61e | 3491 | ret = iterate_inodes_from_logical(loi->logical, fs_info, path, |
e3059ec0 | 3492 | inodes, ignore_offset); |
418ffb9e | 3493 | btrfs_free_path(path); |
df031f07 | 3494 | if (ret == -EINVAL) |
d7728c96 JS |
3495 | ret = -ENOENT; |
3496 | if (ret < 0) | |
3497 | goto out; | |
3498 | ||
718dc5fa OS |
3499 | ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, |
3500 | size); | |
d7728c96 JS |
3501 | if (ret) |
3502 | ret = -EFAULT; | |
3503 | ||
3504 | out: | |
f54de068 | 3505 | kvfree(inodes); |
d24a67b2 | 3506 | out_loi: |
d7728c96 JS |
3507 | kfree(loi); |
3508 | ||
3509 | return ret; | |
3510 | } | |
3511 | ||
008ef096 | 3512 | void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, |
c9e9f97b ID |
3513 | struct btrfs_ioctl_balance_args *bargs) |
3514 | { | |
3515 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3516 | ||
3517 | bargs->flags = bctl->flags; | |
3518 | ||
3009a62f | 3519 | if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) |
837d5b6e ID |
3520 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; |
3521 | if (atomic_read(&fs_info->balance_pause_req)) | |
3522 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3523 | if (atomic_read(&fs_info->balance_cancel_req)) |
3524 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3525 | |
c9e9f97b ID |
3526 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3527 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3528 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce | 3529 | |
008ef096 DS |
3530 | spin_lock(&fs_info->balance_lock); |
3531 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3532 | spin_unlock(&fs_info->balance_lock); | |
c9e9f97b ID |
3533 | } |
3534 | ||
43dd529a | 3535 | /* |
7fb10ed8 NB |
3536 | * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as |
3537 | * required. | |
3538 | * | |
3539 | * @fs_info: the filesystem | |
3540 | * @excl_acquired: ptr to boolean value which is set to false in case balance | |
3541 | * is being resumed | |
3542 | * | |
3543 | * Return 0 on success in which case both fs_info::balance is acquired as well | |
3544 | * as exclusive ops are blocked. In case of failure return an error code. | |
3545 | */ | |
3546 | static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) | |
3547 | { | |
3548 | int ret; | |
3549 | ||
3550 | /* | |
3551 | * Exclusive operation is locked. Three possibilities: | |
3552 | * (1) some other op is running | |
3553 | * (2) balance is running | |
3554 | * (3) balance is paused -- special case (think resume) | |
3555 | */ | |
3556 | while (1) { | |
3557 | if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { | |
3558 | *excl_acquired = true; | |
3559 | mutex_lock(&fs_info->balance_mutex); | |
3560 | return 0; | |
3561 | } | |
3562 | ||
3563 | mutex_lock(&fs_info->balance_mutex); | |
3564 | if (fs_info->balance_ctl) { | |
3565 | /* This is either (2) or (3) */ | |
3566 | if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { | |
3567 | /* This is (2) */ | |
3568 | ret = -EINPROGRESS; | |
3569 | goto out_failure; | |
3570 | ||
3571 | } else { | |
3572 | mutex_unlock(&fs_info->balance_mutex); | |
3573 | /* | |
3574 | * Lock released to allow other waiters to | |
3575 | * continue, we'll reexamine the status again. | |
3576 | */ | |
3577 | mutex_lock(&fs_info->balance_mutex); | |
3578 | ||
3579 | if (fs_info->balance_ctl && | |
3580 | !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { | |
3581 | /* This is (3) */ | |
3582 | *excl_acquired = false; | |
3583 | return 0; | |
3584 | } | |
3585 | } | |
3586 | } else { | |
3587 | /* This is (1) */ | |
3588 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
3589 | goto out_failure; | |
3590 | } | |
3591 | ||
3592 | mutex_unlock(&fs_info->balance_mutex); | |
3593 | } | |
3594 | ||
3595 | out_failure: | |
3596 | mutex_unlock(&fs_info->balance_mutex); | |
3597 | *excl_acquired = false; | |
3598 | return ret; | |
3599 | } | |
3600 | ||
9ba1f6e4 | 3601 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3602 | { |
496ad9aa | 3603 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3604 | struct btrfs_fs_info *fs_info = root->fs_info; |
3605 | struct btrfs_ioctl_balance_args *bargs; | |
3606 | struct btrfs_balance_control *bctl; | |
099aa972 | 3607 | bool need_unlock = true; |
c9e9f97b ID |
3608 | int ret; |
3609 | ||
3610 | if (!capable(CAP_SYS_ADMIN)) | |
3611 | return -EPERM; | |
3612 | ||
e54bfa31 | 3613 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3614 | if (ret) |
3615 | return ret; | |
3616 | ||
d8645462 NB |
3617 | bargs = memdup_user(arg, sizeof(*bargs)); |
3618 | if (IS_ERR(bargs)) { | |
3619 | ret = PTR_ERR(bargs); | |
3620 | bargs = NULL; | |
3621 | goto out; | |
3622 | } | |
3623 | ||
099aa972 NB |
3624 | ret = btrfs_try_lock_balance(fs_info, &need_unlock); |
3625 | if (ret) | |
ed0fb78f | 3626 | goto out; |
ed0fb78f | 3627 | |
099aa972 NB |
3628 | lockdep_assert_held(&fs_info->balance_mutex); |
3629 | ||
39864601 NB |
3630 | if (bargs->flags & BTRFS_BALANCE_RESUME) { |
3631 | if (!fs_info->balance_ctl) { | |
3632 | ret = -ENOTCONN; | |
ed0fb78f | 3633 | goto out_unlock; |
c9e9f97b | 3634 | } |
de322263 | 3635 | |
39864601 NB |
3636 | bctl = fs_info->balance_ctl; |
3637 | spin_lock(&fs_info->balance_lock); | |
3638 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3639 | spin_unlock(&fs_info->balance_lock); | |
3640 | btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); | |
de322263 | 3641 | |
39864601 | 3642 | goto do_balance; |
c9e9f97b | 3643 | } |
de322263 | 3644 | |
d8645462 NB |
3645 | if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
3646 | ret = -EINVAL; | |
3647 | goto out_unlock; | |
c9e9f97b ID |
3648 | } |
3649 | ||
ed0fb78f | 3650 | if (fs_info->balance_ctl) { |
837d5b6e | 3651 | ret = -EINPROGRESS; |
d8645462 | 3652 | goto out_unlock; |
837d5b6e ID |
3653 | } |
3654 | ||
8d2db785 | 3655 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
3656 | if (!bctl) { |
3657 | ret = -ENOMEM; | |
d8645462 | 3658 | goto out_unlock; |
c9e9f97b ID |
3659 | } |
3660 | ||
39864601 NB |
3661 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); |
3662 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3663 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
8eb93459 | 3664 | |
39864601 | 3665 | bctl->flags = bargs->flags; |
de322263 | 3666 | do_balance: |
c9e9f97b | 3667 | /* |
c3e1f96c GR |
3668 | * Ownership of bctl and exclusive operation goes to btrfs_balance. |
3669 | * bctl is freed in reset_balance_state, or, if restriper was paused | |
3670 | * all the way until unmount, in free_fs_info. The flag should be | |
3671 | * cleared after reset_balance_state. | |
c9e9f97b | 3672 | */ |
ed0fb78f ID |
3673 | need_unlock = false; |
3674 | ||
6fcf6e2b | 3675 | ret = btrfs_balance(fs_info, bctl, bargs); |
0f89abf5 | 3676 | bctl = NULL; |
ed0fb78f | 3677 | |
39864601 | 3678 | if (ret == 0 || ret == -ECANCELED) { |
c9e9f97b ID |
3679 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
3680 | ret = -EFAULT; | |
3681 | } | |
3682 | ||
0f89abf5 | 3683 | kfree(bctl); |
ed0fb78f | 3684 | out_unlock: |
c9e9f97b | 3685 | mutex_unlock(&fs_info->balance_mutex); |
ed0fb78f | 3686 | if (need_unlock) |
c3e1f96c | 3687 | btrfs_exclop_finish(fs_info); |
ed0fb78f | 3688 | out: |
e54bfa31 | 3689 | mnt_drop_write_file(file); |
d8645462 | 3690 | kfree(bargs); |
c9e9f97b ID |
3691 | return ret; |
3692 | } | |
3693 | ||
2ff7e61e | 3694 | static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) |
837d5b6e ID |
3695 | { |
3696 | if (!capable(CAP_SYS_ADMIN)) | |
3697 | return -EPERM; | |
3698 | ||
3699 | switch (cmd) { | |
3700 | case BTRFS_BALANCE_CTL_PAUSE: | |
0b246afa | 3701 | return btrfs_pause_balance(fs_info); |
a7e99c69 | 3702 | case BTRFS_BALANCE_CTL_CANCEL: |
0b246afa | 3703 | return btrfs_cancel_balance(fs_info); |
837d5b6e ID |
3704 | } |
3705 | ||
3706 | return -EINVAL; | |
3707 | } | |
3708 | ||
2ff7e61e | 3709 | static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, |
19a39dce ID |
3710 | void __user *arg) |
3711 | { | |
19a39dce ID |
3712 | struct btrfs_ioctl_balance_args *bargs; |
3713 | int ret = 0; | |
3714 | ||
3715 | if (!capable(CAP_SYS_ADMIN)) | |
3716 | return -EPERM; | |
3717 | ||
3718 | mutex_lock(&fs_info->balance_mutex); | |
3719 | if (!fs_info->balance_ctl) { | |
3720 | ret = -ENOTCONN; | |
3721 | goto out; | |
3722 | } | |
3723 | ||
8d2db785 | 3724 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
3725 | if (!bargs) { |
3726 | ret = -ENOMEM; | |
3727 | goto out; | |
3728 | } | |
3729 | ||
008ef096 | 3730 | btrfs_update_ioctl_balance_args(fs_info, bargs); |
19a39dce ID |
3731 | |
3732 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3733 | ret = -EFAULT; | |
3734 | ||
3735 | kfree(bargs); | |
3736 | out: | |
3737 | mutex_unlock(&fs_info->balance_mutex); | |
3738 | return ret; | |
3739 | } | |
3740 | ||
905b0dda | 3741 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 3742 | { |
0b246afa | 3743 | struct inode *inode = file_inode(file); |
41044b41 | 3744 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
5d13a37b | 3745 | struct btrfs_ioctl_quota_ctl_args *sa; |
5d13a37b | 3746 | int ret; |
5d13a37b AJ |
3747 | |
3748 | if (!capable(CAP_SYS_ADMIN)) | |
3749 | return -EPERM; | |
3750 | ||
905b0dda MX |
3751 | ret = mnt_want_write_file(file); |
3752 | if (ret) | |
3753 | return ret; | |
5d13a37b AJ |
3754 | |
3755 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3756 | if (IS_ERR(sa)) { |
3757 | ret = PTR_ERR(sa); | |
3758 | goto drop_write; | |
3759 | } | |
5d13a37b | 3760 | |
5d13a37b AJ |
3761 | switch (sa->cmd) { |
3762 | case BTRFS_QUOTA_CTL_ENABLE: | |
182940f4 | 3763 | case BTRFS_QUOTA_CTL_ENABLE_SIMPLE_QUOTA: |
0f2b8098 | 3764 | down_write(&fs_info->subvol_sem); |
182940f4 | 3765 | ret = btrfs_quota_enable(fs_info, sa); |
0f2b8098 | 3766 | up_write(&fs_info->subvol_sem); |
5d13a37b AJ |
3767 | break; |
3768 | case BTRFS_QUOTA_CTL_DISABLE: | |
0f2b8098 JB |
3769 | /* |
3770 | * Lock the cleaner mutex to prevent races with concurrent | |
3771 | * relocation, because relocation may be building backrefs for | |
3772 | * blocks of the quota root while we are deleting the root. This | |
3773 | * is like dropping fs roots of deleted snapshots/subvolumes, we | |
3774 | * need the same protection. | |
3775 | * | |
3776 | * This also prevents races between concurrent tasks trying to | |
3777 | * disable quotas, because we will unlock and relock | |
3778 | * qgroup_ioctl_lock across BTRFS_FS_QUOTA_ENABLED changes. | |
3779 | * | |
3780 | * We take this here because we have the dependency of | |
3781 | * | |
3782 | * inode_lock -> subvol_sem | |
3783 | * | |
3784 | * because of rename. With relocation we can prealloc extents, | |
3785 | * so that makes the dependency chain | |
3786 | * | |
3787 | * cleaner_mutex -> inode_lock -> subvol_sem | |
3788 | * | |
3789 | * so we must take the cleaner_mutex here before we take the | |
3790 | * subvol_sem. The deadlock can't actually happen, but this | |
3791 | * quiets lockdep. | |
3792 | */ | |
3793 | mutex_lock(&fs_info->cleaner_mutex); | |
3794 | down_write(&fs_info->subvol_sem); | |
340f1aa2 | 3795 | ret = btrfs_quota_disable(fs_info); |
0f2b8098 JB |
3796 | up_write(&fs_info->subvol_sem); |
3797 | mutex_unlock(&fs_info->cleaner_mutex); | |
5d13a37b | 3798 | break; |
5d13a37b AJ |
3799 | default: |
3800 | ret = -EINVAL; | |
3801 | break; | |
3802 | } | |
3803 | ||
5d13a37b | 3804 | kfree(sa); |
905b0dda MX |
3805 | drop_write: |
3806 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3807 | return ret; |
3808 | } | |
3809 | ||
905b0dda | 3810 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 3811 | { |
0b246afa | 3812 | struct inode *inode = file_inode(file); |
41044b41 | 3813 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0b246afa | 3814 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
3815 | struct btrfs_ioctl_qgroup_assign_args *sa; |
3816 | struct btrfs_trans_handle *trans; | |
3817 | int ret; | |
3818 | int err; | |
3819 | ||
3820 | if (!capable(CAP_SYS_ADMIN)) | |
3821 | return -EPERM; | |
3822 | ||
905b0dda MX |
3823 | ret = mnt_want_write_file(file); |
3824 | if (ret) | |
3825 | return ret; | |
5d13a37b AJ |
3826 | |
3827 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3828 | if (IS_ERR(sa)) { |
3829 | ret = PTR_ERR(sa); | |
3830 | goto drop_write; | |
3831 | } | |
5d13a37b AJ |
3832 | |
3833 | trans = btrfs_join_transaction(root); | |
3834 | if (IS_ERR(trans)) { | |
3835 | ret = PTR_ERR(trans); | |
3836 | goto out; | |
3837 | } | |
3838 | ||
5d13a37b | 3839 | if (sa->assign) { |
9f8a6ce6 | 3840 | ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b | 3841 | } else { |
39616c27 | 3842 | ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b AJ |
3843 | } |
3844 | ||
e082f563 | 3845 | /* update qgroup status and info */ |
2f1a6be1 | 3846 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
280f8bd2 | 3847 | err = btrfs_run_qgroups(trans); |
2f1a6be1 | 3848 | mutex_unlock(&fs_info->qgroup_ioctl_lock); |
e082f563 | 3849 | if (err < 0) |
0b246afa JM |
3850 | btrfs_handle_fs_error(fs_info, err, |
3851 | "failed to update qgroup status and info"); | |
3a45bb20 | 3852 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3853 | if (err && !ret) |
3854 | ret = err; | |
3855 | ||
3856 | out: | |
3857 | kfree(sa); | |
905b0dda MX |
3858 | drop_write: |
3859 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3860 | return ret; |
3861 | } | |
3862 | ||
905b0dda | 3863 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 3864 | { |
0b246afa | 3865 | struct inode *inode = file_inode(file); |
0b246afa | 3866 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
3867 | struct btrfs_ioctl_qgroup_create_args *sa; |
3868 | struct btrfs_trans_handle *trans; | |
3869 | int ret; | |
3870 | int err; | |
3871 | ||
3872 | if (!capable(CAP_SYS_ADMIN)) | |
3873 | return -EPERM; | |
3874 | ||
905b0dda MX |
3875 | ret = mnt_want_write_file(file); |
3876 | if (ret) | |
3877 | return ret; | |
5d13a37b AJ |
3878 | |
3879 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3880 | if (IS_ERR(sa)) { |
3881 | ret = PTR_ERR(sa); | |
3882 | goto drop_write; | |
3883 | } | |
5d13a37b | 3884 | |
d86e56cf MX |
3885 | if (!sa->qgroupid) { |
3886 | ret = -EINVAL; | |
3887 | goto out; | |
3888 | } | |
3889 | ||
0c309d66 BB |
3890 | if (sa->create && is_fstree(sa->qgroupid)) { |
3891 | ret = -EINVAL; | |
3892 | goto out; | |
3893 | } | |
3894 | ||
5d13a37b AJ |
3895 | trans = btrfs_join_transaction(root); |
3896 | if (IS_ERR(trans)) { | |
3897 | ret = PTR_ERR(trans); | |
3898 | goto out; | |
3899 | } | |
3900 | ||
5d13a37b | 3901 | if (sa->create) { |
49a05ecd | 3902 | ret = btrfs_create_qgroup(trans, sa->qgroupid); |
5d13a37b | 3903 | } else { |
3efbee1d | 3904 | ret = btrfs_remove_qgroup(trans, sa->qgroupid); |
5d13a37b AJ |
3905 | } |
3906 | ||
3a45bb20 | 3907 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3908 | if (err && !ret) |
3909 | ret = err; | |
3910 | ||
3911 | out: | |
3912 | kfree(sa); | |
905b0dda MX |
3913 | drop_write: |
3914 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3915 | return ret; |
3916 | } | |
3917 | ||
905b0dda | 3918 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 3919 | { |
0b246afa | 3920 | struct inode *inode = file_inode(file); |
0b246afa | 3921 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
3922 | struct btrfs_ioctl_qgroup_limit_args *sa; |
3923 | struct btrfs_trans_handle *trans; | |
3924 | int ret; | |
3925 | int err; | |
3926 | u64 qgroupid; | |
3927 | ||
3928 | if (!capable(CAP_SYS_ADMIN)) | |
3929 | return -EPERM; | |
3930 | ||
905b0dda MX |
3931 | ret = mnt_want_write_file(file); |
3932 | if (ret) | |
3933 | return ret; | |
5d13a37b AJ |
3934 | |
3935 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3936 | if (IS_ERR(sa)) { |
3937 | ret = PTR_ERR(sa); | |
3938 | goto drop_write; | |
3939 | } | |
5d13a37b AJ |
3940 | |
3941 | trans = btrfs_join_transaction(root); | |
3942 | if (IS_ERR(trans)) { | |
3943 | ret = PTR_ERR(trans); | |
3944 | goto out; | |
3945 | } | |
3946 | ||
3947 | qgroupid = sa->qgroupid; | |
3948 | if (!qgroupid) { | |
3949 | /* take the current subvol as qgroup */ | |
e094f480 | 3950 | qgroupid = btrfs_root_id(root); |
5d13a37b AJ |
3951 | } |
3952 | ||
f0042d5e | 3953 | ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); |
5d13a37b | 3954 | |
3a45bb20 | 3955 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3956 | if (err && !ret) |
3957 | ret = err; | |
3958 | ||
3959 | out: | |
3960 | kfree(sa); | |
905b0dda MX |
3961 | drop_write: |
3962 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3963 | return ret; |
3964 | } | |
3965 | ||
2f232036 JS |
3966 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
3967 | { | |
0b246afa | 3968 | struct inode *inode = file_inode(file); |
41044b41 | 3969 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
2f232036 JS |
3970 | struct btrfs_ioctl_quota_rescan_args *qsa; |
3971 | int ret; | |
3972 | ||
3973 | if (!capable(CAP_SYS_ADMIN)) | |
3974 | return -EPERM; | |
3975 | ||
3976 | ret = mnt_want_write_file(file); | |
3977 | if (ret) | |
3978 | return ret; | |
3979 | ||
3980 | qsa = memdup_user(arg, sizeof(*qsa)); | |
3981 | if (IS_ERR(qsa)) { | |
3982 | ret = PTR_ERR(qsa); | |
3983 | goto drop_write; | |
3984 | } | |
3985 | ||
3986 | if (qsa->flags) { | |
3987 | ret = -EINVAL; | |
3988 | goto out; | |
3989 | } | |
3990 | ||
0b246afa | 3991 | ret = btrfs_qgroup_rescan(fs_info); |
2f232036 JS |
3992 | |
3993 | out: | |
3994 | kfree(qsa); | |
3995 | drop_write: | |
3996 | mnt_drop_write_file(file); | |
3997 | return ret; | |
3998 | } | |
3999 | ||
b929c1d8 MPS |
4000 | static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, |
4001 | void __user *arg) | |
2f232036 | 4002 | { |
0afb603a | 4003 | struct btrfs_ioctl_quota_rescan_args qsa = {0}; |
2f232036 JS |
4004 | |
4005 | if (!capable(CAP_SYS_ADMIN)) | |
4006 | return -EPERM; | |
4007 | ||
0b246afa | 4008 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
0afb603a GR |
4009 | qsa.flags = 1; |
4010 | qsa.progress = fs_info->qgroup_rescan_progress.objectid; | |
2f232036 JS |
4011 | } |
4012 | ||
0afb603a | 4013 | if (copy_to_user(arg, &qsa, sizeof(qsa))) |
991a3dae | 4014 | return -EFAULT; |
2f232036 | 4015 | |
991a3dae | 4016 | return 0; |
2f232036 JS |
4017 | } |
4018 | ||
b929c1d8 MPS |
4019 | static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, |
4020 | void __user *arg) | |
57254b6e | 4021 | { |
57254b6e JS |
4022 | if (!capable(CAP_SYS_ADMIN)) |
4023 | return -EPERM; | |
4024 | ||
0b246afa | 4025 | return btrfs_qgroup_wait_for_completion(fs_info, true); |
57254b6e JS |
4026 | } |
4027 | ||
abccd00f | 4028 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
01beba79 | 4029 | struct mnt_idmap *idmap, |
abccd00f | 4030 | struct btrfs_ioctl_received_subvol_args *sa) |
8ea05e3a | 4031 | { |
496ad9aa | 4032 | struct inode *inode = file_inode(file); |
41044b41 | 4033 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
8ea05e3a AB |
4034 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4035 | struct btrfs_root_item *root_item = &root->root_item; | |
4036 | struct btrfs_trans_handle *trans; | |
95582b00 | 4037 | struct timespec64 ct = current_time(inode); |
8ea05e3a | 4038 | int ret = 0; |
dd5f9615 | 4039 | int received_uuid_changed; |
8ea05e3a | 4040 | |
01beba79 | 4041 | if (!inode_owner_or_capable(idmap, inode)) |
bd60ea0f DS |
4042 | return -EPERM; |
4043 | ||
8ea05e3a AB |
4044 | ret = mnt_want_write_file(file); |
4045 | if (ret < 0) | |
4046 | return ret; | |
4047 | ||
0b246afa | 4048 | down_write(&fs_info->subvol_sem); |
8ea05e3a | 4049 | |
4a0cc7ca | 4050 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
8ea05e3a AB |
4051 | ret = -EINVAL; |
4052 | goto out; | |
4053 | } | |
4054 | ||
4055 | if (btrfs_root_readonly(root)) { | |
4056 | ret = -EROFS; | |
4057 | goto out; | |
4058 | } | |
4059 | ||
dd5f9615 SB |
4060 | /* |
4061 | * 1 - root item | |
4062 | * 2 - uuid items (received uuid + subvol uuid) | |
4063 | */ | |
4064 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
4065 | if (IS_ERR(trans)) { |
4066 | ret = PTR_ERR(trans); | |
4067 | trans = NULL; | |
4068 | goto out; | |
4069 | } | |
4070 | ||
4071 | sa->rtransid = trans->transid; | |
4072 | sa->rtime.sec = ct.tv_sec; | |
4073 | sa->rtime.nsec = ct.tv_nsec; | |
4074 | ||
dd5f9615 SB |
4075 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
4076 | BTRFS_UUID_SIZE); | |
4077 | if (received_uuid_changed && | |
d87ff758 | 4078 | !btrfs_is_empty_uuid(root_item->received_uuid)) { |
d1957791 | 4079 | ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, |
d87ff758 | 4080 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
e094f480 | 4081 | btrfs_root_id(root)); |
d87ff758 NB |
4082 | if (ret && ret != -ENOENT) { |
4083 | btrfs_abort_transaction(trans, ret); | |
4084 | btrfs_end_transaction(trans); | |
4085 | goto out; | |
4086 | } | |
4087 | } | |
8ea05e3a AB |
4088 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
4089 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4090 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
4091 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
4092 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
4093 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
4094 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a | 4095 | |
0b246afa | 4096 | ret = btrfs_update_root(trans, fs_info->tree_root, |
8ea05e3a AB |
4097 | &root->root_key, &root->root_item); |
4098 | if (ret < 0) { | |
3a45bb20 | 4099 | btrfs_end_transaction(trans); |
8ea05e3a | 4100 | goto out; |
dd5f9615 SB |
4101 | } |
4102 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
cdb345a8 | 4103 | ret = btrfs_uuid_tree_add(trans, sa->uuid, |
dd5f9615 | 4104 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
e094f480 | 4105 | btrfs_root_id(root)); |
dd5f9615 | 4106 | if (ret < 0 && ret != -EEXIST) { |
66642832 | 4107 | btrfs_abort_transaction(trans, ret); |
efd38150 | 4108 | btrfs_end_transaction(trans); |
8ea05e3a | 4109 | goto out; |
dd5f9615 SB |
4110 | } |
4111 | } | |
3a45bb20 | 4112 | ret = btrfs_commit_transaction(trans); |
abccd00f | 4113 | out: |
0b246afa | 4114 | up_write(&fs_info->subvol_sem); |
abccd00f HM |
4115 | mnt_drop_write_file(file); |
4116 | return ret; | |
4117 | } | |
4118 | ||
4119 | #ifdef CONFIG_64BIT | |
4120 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
4121 | void __user *arg) | |
4122 | { | |
4123 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
4124 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
4125 | int ret = 0; | |
4126 | ||
4127 | args32 = memdup_user(arg, sizeof(*args32)); | |
7b9ea627 SV |
4128 | if (IS_ERR(args32)) |
4129 | return PTR_ERR(args32); | |
abccd00f | 4130 | |
8d2db785 | 4131 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
4132 | if (!args64) { |
4133 | ret = -ENOMEM; | |
abccd00f HM |
4134 | goto out; |
4135 | } | |
4136 | ||
4137 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
4138 | args64->stransid = args32->stransid; | |
4139 | args64->rtransid = args32->rtransid; | |
4140 | args64->stime.sec = args32->stime.sec; | |
4141 | args64->stime.nsec = args32->stime.nsec; | |
4142 | args64->rtime.sec = args32->rtime.sec; | |
4143 | args64->rtime.nsec = args32->rtime.nsec; | |
4144 | args64->flags = args32->flags; | |
4145 | ||
01beba79 | 4146 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64); |
abccd00f HM |
4147 | if (ret) |
4148 | goto out; | |
4149 | ||
4150 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
4151 | args32->stransid = args64->stransid; | |
4152 | args32->rtransid = args64->rtransid; | |
4153 | args32->stime.sec = args64->stime.sec; | |
4154 | args32->stime.nsec = args64->stime.nsec; | |
4155 | args32->rtime.sec = args64->rtime.sec; | |
4156 | args32->rtime.nsec = args64->rtime.nsec; | |
4157 | args32->flags = args64->flags; | |
4158 | ||
4159 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
4160 | if (ret) | |
4161 | ret = -EFAULT; | |
4162 | ||
4163 | out: | |
4164 | kfree(args32); | |
4165 | kfree(args64); | |
4166 | return ret; | |
4167 | } | |
4168 | #endif | |
4169 | ||
4170 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
4171 | void __user *arg) | |
4172 | { | |
4173 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
4174 | int ret = 0; | |
4175 | ||
4176 | sa = memdup_user(arg, sizeof(*sa)); | |
7b9ea627 SV |
4177 | if (IS_ERR(sa)) |
4178 | return PTR_ERR(sa); | |
abccd00f | 4179 | |
01beba79 | 4180 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa); |
abccd00f HM |
4181 | |
4182 | if (ret) | |
4183 | goto out; | |
4184 | ||
8ea05e3a AB |
4185 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
4186 | if (ret) | |
4187 | ret = -EFAULT; | |
4188 | ||
4189 | out: | |
4190 | kfree(sa); | |
8ea05e3a AB |
4191 | return ret; |
4192 | } | |
4193 | ||
b929c1d8 MPS |
4194 | static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, |
4195 | void __user *arg) | |
867ab667 | 4196 | { |
a1b83ac5 | 4197 | size_t len; |
867ab667 | 4198 | int ret; |
a1b83ac5 AJ |
4199 | char label[BTRFS_LABEL_SIZE]; |
4200 | ||
0b246afa JM |
4201 | spin_lock(&fs_info->super_lock); |
4202 | memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4203 | spin_unlock(&fs_info->super_lock); | |
a1b83ac5 AJ |
4204 | |
4205 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 4206 | |
4207 | if (len == BTRFS_LABEL_SIZE) { | |
0b246afa JM |
4208 | btrfs_warn(fs_info, |
4209 | "label is too long, return the first %zu bytes", | |
4210 | --len); | |
867ab667 | 4211 | } |
4212 | ||
867ab667 | 4213 | ret = copy_to_user(arg, label, len); |
867ab667 | 4214 | |
4215 | return ret ? -EFAULT : 0; | |
4216 | } | |
4217 | ||
a8bfd4ab | 4218 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4219 | { | |
0b246afa | 4220 | struct inode *inode = file_inode(file); |
41044b41 | 4221 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0b246afa JM |
4222 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4223 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
a8bfd4ab | 4224 | struct btrfs_trans_handle *trans; |
4225 | char label[BTRFS_LABEL_SIZE]; | |
4226 | int ret; | |
4227 | ||
4228 | if (!capable(CAP_SYS_ADMIN)) | |
4229 | return -EPERM; | |
4230 | ||
4231 | if (copy_from_user(label, arg, sizeof(label))) | |
4232 | return -EFAULT; | |
4233 | ||
4234 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
0b246afa | 4235 | btrfs_err(fs_info, |
5d163e0e JM |
4236 | "unable to set label with more than %d bytes", |
4237 | BTRFS_LABEL_SIZE - 1); | |
a8bfd4ab | 4238 | return -EINVAL; |
4239 | } | |
4240 | ||
4241 | ret = mnt_want_write_file(file); | |
4242 | if (ret) | |
4243 | return ret; | |
4244 | ||
a8bfd4ab | 4245 | trans = btrfs_start_transaction(root, 0); |
4246 | if (IS_ERR(trans)) { | |
4247 | ret = PTR_ERR(trans); | |
4248 | goto out_unlock; | |
4249 | } | |
4250 | ||
0b246afa | 4251 | spin_lock(&fs_info->super_lock); |
a8bfd4ab | 4252 | strcpy(super_block->label, label); |
0b246afa | 4253 | spin_unlock(&fs_info->super_lock); |
3a45bb20 | 4254 | ret = btrfs_commit_transaction(trans); |
a8bfd4ab | 4255 | |
4256 | out_unlock: | |
a8bfd4ab | 4257 | mnt_drop_write_file(file); |
4258 | return ret; | |
4259 | } | |
4260 | ||
2eaa055f JM |
4261 | #define INIT_FEATURE_FLAGS(suffix) \ |
4262 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
4263 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
4264 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
4265 | ||
d5131b65 | 4266 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 4267 | { |
4d4ab6d6 | 4268 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
4269 | INIT_FEATURE_FLAGS(SUPP), |
4270 | INIT_FEATURE_FLAGS(SAFE_SET), | |
4271 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
4272 | }; | |
4273 | ||
4274 | if (copy_to_user(arg, &features, sizeof(features))) | |
4275 | return -EFAULT; | |
4276 | ||
4277 | return 0; | |
4278 | } | |
4279 | ||
b929c1d8 MPS |
4280 | static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, |
4281 | void __user *arg) | |
2eaa055f | 4282 | { |
0b246afa | 4283 | struct btrfs_super_block *super_block = fs_info->super_copy; |
2eaa055f JM |
4284 | struct btrfs_ioctl_feature_flags features; |
4285 | ||
4286 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
4287 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
4288 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
4289 | ||
4290 | if (copy_to_user(arg, &features, sizeof(features))) | |
4291 | return -EFAULT; | |
4292 | ||
4293 | return 0; | |
4294 | } | |
4295 | ||
2ff7e61e | 4296 | static int check_feature_bits(struct btrfs_fs_info *fs_info, |
3b02a68a | 4297 | enum btrfs_feature_set set, |
2eaa055f JM |
4298 | u64 change_mask, u64 flags, u64 supported_flags, |
4299 | u64 safe_set, u64 safe_clear) | |
4300 | { | |
f10152bc | 4301 | const char *type = btrfs_feature_set_name(set); |
3b02a68a | 4302 | char *names; |
2eaa055f JM |
4303 | u64 disallowed, unsupported; |
4304 | u64 set_mask = flags & change_mask; | |
4305 | u64 clear_mask = ~flags & change_mask; | |
4306 | ||
4307 | unsupported = set_mask & ~supported_flags; | |
4308 | if (unsupported) { | |
3b02a68a JM |
4309 | names = btrfs_printable_features(set, unsupported); |
4310 | if (names) { | |
0b246afa JM |
4311 | btrfs_warn(fs_info, |
4312 | "this kernel does not support the %s feature bit%s", | |
4313 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4314 | kfree(names); |
4315 | } else | |
0b246afa JM |
4316 | btrfs_warn(fs_info, |
4317 | "this kernel does not support %s bits 0x%llx", | |
4318 | type, unsupported); | |
2eaa055f JM |
4319 | return -EOPNOTSUPP; |
4320 | } | |
4321 | ||
4322 | disallowed = set_mask & ~safe_set; | |
4323 | if (disallowed) { | |
3b02a68a JM |
4324 | names = btrfs_printable_features(set, disallowed); |
4325 | if (names) { | |
0b246afa JM |
4326 | btrfs_warn(fs_info, |
4327 | "can't set the %s feature bit%s while mounted", | |
4328 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4329 | kfree(names); |
4330 | } else | |
0b246afa JM |
4331 | btrfs_warn(fs_info, |
4332 | "can't set %s bits 0x%llx while mounted", | |
4333 | type, disallowed); | |
2eaa055f JM |
4334 | return -EPERM; |
4335 | } | |
4336 | ||
4337 | disallowed = clear_mask & ~safe_clear; | |
4338 | if (disallowed) { | |
3b02a68a JM |
4339 | names = btrfs_printable_features(set, disallowed); |
4340 | if (names) { | |
0b246afa JM |
4341 | btrfs_warn(fs_info, |
4342 | "can't clear the %s feature bit%s while mounted", | |
4343 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4344 | kfree(names); |
4345 | } else | |
0b246afa JM |
4346 | btrfs_warn(fs_info, |
4347 | "can't clear %s bits 0x%llx while mounted", | |
4348 | type, disallowed); | |
2eaa055f JM |
4349 | return -EPERM; |
4350 | } | |
4351 | ||
4352 | return 0; | |
4353 | } | |
4354 | ||
2ff7e61e JM |
4355 | #define check_feature(fs_info, change_mask, flags, mask_base) \ |
4356 | check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ | |
2eaa055f JM |
4357 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
4358 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
4359 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
4360 | ||
4361 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
4362 | { | |
0b246afa | 4363 | struct inode *inode = file_inode(file); |
41044b41 | 4364 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0b246afa JM |
4365 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4366 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
2eaa055f JM |
4367 | struct btrfs_ioctl_feature_flags flags[2]; |
4368 | struct btrfs_trans_handle *trans; | |
4369 | u64 newflags; | |
4370 | int ret; | |
4371 | ||
4372 | if (!capable(CAP_SYS_ADMIN)) | |
4373 | return -EPERM; | |
4374 | ||
4375 | if (copy_from_user(flags, arg, sizeof(flags))) | |
4376 | return -EFAULT; | |
4377 | ||
4378 | /* Nothing to do */ | |
4379 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
4380 | !flags[0].incompat_flags) | |
4381 | return 0; | |
4382 | ||
2ff7e61e | 4383 | ret = check_feature(fs_info, flags[0].compat_flags, |
2eaa055f JM |
4384 | flags[1].compat_flags, COMPAT); |
4385 | if (ret) | |
4386 | return ret; | |
4387 | ||
2ff7e61e | 4388 | ret = check_feature(fs_info, flags[0].compat_ro_flags, |
2eaa055f JM |
4389 | flags[1].compat_ro_flags, COMPAT_RO); |
4390 | if (ret) | |
4391 | return ret; | |
4392 | ||
2ff7e61e | 4393 | ret = check_feature(fs_info, flags[0].incompat_flags, |
2eaa055f JM |
4394 | flags[1].incompat_flags, INCOMPAT); |
4395 | if (ret) | |
4396 | return ret; | |
4397 | ||
7ab19625 DS |
4398 | ret = mnt_want_write_file(file); |
4399 | if (ret) | |
4400 | return ret; | |
4401 | ||
8051aa1a | 4402 | trans = btrfs_start_transaction(root, 0); |
7ab19625 DS |
4403 | if (IS_ERR(trans)) { |
4404 | ret = PTR_ERR(trans); | |
4405 | goto out_drop_write; | |
4406 | } | |
2eaa055f | 4407 | |
0b246afa | 4408 | spin_lock(&fs_info->super_lock); |
2eaa055f JM |
4409 | newflags = btrfs_super_compat_flags(super_block); |
4410 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
4411 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
4412 | btrfs_set_super_compat_flags(super_block, newflags); | |
4413 | ||
4414 | newflags = btrfs_super_compat_ro_flags(super_block); | |
4415 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
4416 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
4417 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
4418 | ||
4419 | newflags = btrfs_super_incompat_flags(super_block); | |
4420 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
4421 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
4422 | btrfs_set_super_incompat_flags(super_block, newflags); | |
0b246afa | 4423 | spin_unlock(&fs_info->super_lock); |
2eaa055f | 4424 | |
3a45bb20 | 4425 | ret = btrfs_commit_transaction(trans); |
7ab19625 DS |
4426 | out_drop_write: |
4427 | mnt_drop_write_file(file); | |
4428 | ||
4429 | return ret; | |
2eaa055f JM |
4430 | } |
4431 | ||
9ad12305 | 4432 | static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) |
2351f431 JB |
4433 | { |
4434 | struct btrfs_ioctl_send_args *arg; | |
4435 | int ret; | |
4436 | ||
4437 | if (compat) { | |
4438 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
9147b9de | 4439 | struct btrfs_ioctl_send_args_32 args32 = { 0 }; |
2351f431 JB |
4440 | |
4441 | ret = copy_from_user(&args32, argp, sizeof(args32)); | |
4442 | if (ret) | |
4443 | return -EFAULT; | |
4444 | arg = kzalloc(sizeof(*arg), GFP_KERNEL); | |
4445 | if (!arg) | |
4446 | return -ENOMEM; | |
4447 | arg->send_fd = args32.send_fd; | |
4448 | arg->clone_sources_count = args32.clone_sources_count; | |
4449 | arg->clone_sources = compat_ptr(args32.clone_sources); | |
4450 | arg->parent_root = args32.parent_root; | |
4451 | arg->flags = args32.flags; | |
5de0434b | 4452 | arg->version = args32.version; |
2351f431 JB |
4453 | memcpy(arg->reserved, args32.reserved, |
4454 | sizeof(args32.reserved)); | |
4455 | #else | |
4456 | return -ENOTTY; | |
4457 | #endif | |
4458 | } else { | |
4459 | arg = memdup_user(argp, sizeof(*arg)); | |
4460 | if (IS_ERR(arg)) | |
4461 | return PTR_ERR(arg); | |
4462 | } | |
9ad12305 | 4463 | ret = btrfs_ioctl_send(inode, arg); |
2351f431 JB |
4464 | kfree(arg); |
4465 | return ret; | |
4466 | } | |
4467 | ||
1881fba8 OS |
4468 | static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, |
4469 | bool compat) | |
4470 | { | |
4471 | struct btrfs_ioctl_encoded_io_args args = { 0 }; | |
4472 | size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, | |
4473 | flags); | |
4474 | size_t copy_end; | |
4475 | struct iovec iovstack[UIO_FASTIOV]; | |
4476 | struct iovec *iov = iovstack; | |
4477 | struct iov_iter iter; | |
4478 | loff_t pos; | |
4479 | struct kiocb kiocb; | |
4480 | ssize_t ret; | |
4481 | ||
4482 | if (!capable(CAP_SYS_ADMIN)) { | |
4483 | ret = -EPERM; | |
4484 | goto out_acct; | |
4485 | } | |
4486 | ||
4487 | if (compat) { | |
4488 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4489 | struct btrfs_ioctl_encoded_io_args_32 args32; | |
4490 | ||
4491 | copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, | |
4492 | flags); | |
4493 | if (copy_from_user(&args32, argp, copy_end)) { | |
4494 | ret = -EFAULT; | |
4495 | goto out_acct; | |
4496 | } | |
4497 | args.iov = compat_ptr(args32.iov); | |
4498 | args.iovcnt = args32.iovcnt; | |
4499 | args.offset = args32.offset; | |
4500 | args.flags = args32.flags; | |
4501 | #else | |
4502 | return -ENOTTY; | |
4503 | #endif | |
4504 | } else { | |
4505 | copy_end = copy_end_kernel; | |
4506 | if (copy_from_user(&args, argp, copy_end)) { | |
4507 | ret = -EFAULT; | |
4508 | goto out_acct; | |
4509 | } | |
4510 | } | |
4511 | if (args.flags != 0) { | |
4512 | ret = -EINVAL; | |
4513 | goto out_acct; | |
4514 | } | |
4515 | ||
de4eda9d | 4516 | ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), |
1881fba8 OS |
4517 | &iov, &iter); |
4518 | if (ret < 0) | |
4519 | goto out_acct; | |
4520 | ||
4521 | if (iov_iter_count(&iter) == 0) { | |
4522 | ret = 0; | |
4523 | goto out_iov; | |
4524 | } | |
4525 | pos = args.offset; | |
4526 | ret = rw_verify_area(READ, file, &pos, args.len); | |
4527 | if (ret < 0) | |
4528 | goto out_iov; | |
4529 | ||
4530 | init_sync_kiocb(&kiocb, file); | |
4531 | kiocb.ki_pos = pos; | |
4532 | ||
4533 | ret = btrfs_encoded_read(&kiocb, &iter, &args); | |
4534 | if (ret >= 0) { | |
4535 | fsnotify_access(file); | |
4536 | if (copy_to_user(argp + copy_end, | |
4537 | (char *)&args + copy_end_kernel, | |
4538 | sizeof(args) - copy_end_kernel)) | |
4539 | ret = -EFAULT; | |
4540 | } | |
4541 | ||
4542 | out_iov: | |
4543 | kfree(iov); | |
4544 | out_acct: | |
4545 | if (ret > 0) | |
4546 | add_rchar(current, ret); | |
4547 | inc_syscr(current); | |
4548 | return ret; | |
4549 | } | |
4550 | ||
7c0c7269 OS |
4551 | static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) |
4552 | { | |
4553 | struct btrfs_ioctl_encoded_io_args args; | |
4554 | struct iovec iovstack[UIO_FASTIOV]; | |
4555 | struct iovec *iov = iovstack; | |
4556 | struct iov_iter iter; | |
4557 | loff_t pos; | |
4558 | struct kiocb kiocb; | |
4559 | ssize_t ret; | |
4560 | ||
4561 | if (!capable(CAP_SYS_ADMIN)) { | |
4562 | ret = -EPERM; | |
4563 | goto out_acct; | |
4564 | } | |
4565 | ||
4566 | if (!(file->f_mode & FMODE_WRITE)) { | |
4567 | ret = -EBADF; | |
4568 | goto out_acct; | |
4569 | } | |
4570 | ||
4571 | if (compat) { | |
4572 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4573 | struct btrfs_ioctl_encoded_io_args_32 args32; | |
4574 | ||
4575 | if (copy_from_user(&args32, argp, sizeof(args32))) { | |
4576 | ret = -EFAULT; | |
4577 | goto out_acct; | |
4578 | } | |
4579 | args.iov = compat_ptr(args32.iov); | |
4580 | args.iovcnt = args32.iovcnt; | |
4581 | args.offset = args32.offset; | |
4582 | args.flags = args32.flags; | |
4583 | args.len = args32.len; | |
4584 | args.unencoded_len = args32.unencoded_len; | |
4585 | args.unencoded_offset = args32.unencoded_offset; | |
4586 | args.compression = args32.compression; | |
4587 | args.encryption = args32.encryption; | |
4588 | memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); | |
4589 | #else | |
4590 | return -ENOTTY; | |
4591 | #endif | |
4592 | } else { | |
4593 | if (copy_from_user(&args, argp, sizeof(args))) { | |
4594 | ret = -EFAULT; | |
4595 | goto out_acct; | |
4596 | } | |
4597 | } | |
4598 | ||
4599 | ret = -EINVAL; | |
4600 | if (args.flags != 0) | |
4601 | goto out_acct; | |
4602 | if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) | |
4603 | goto out_acct; | |
4604 | if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && | |
4605 | args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) | |
4606 | goto out_acct; | |
4607 | if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || | |
4608 | args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) | |
4609 | goto out_acct; | |
4610 | if (args.unencoded_offset > args.unencoded_len) | |
4611 | goto out_acct; | |
4612 | if (args.len > args.unencoded_len - args.unencoded_offset) | |
4613 | goto out_acct; | |
4614 | ||
de4eda9d | 4615 | ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), |
7c0c7269 OS |
4616 | &iov, &iter); |
4617 | if (ret < 0) | |
4618 | goto out_acct; | |
4619 | ||
7c0c7269 OS |
4620 | if (iov_iter_count(&iter) == 0) { |
4621 | ret = 0; | |
2f4d8ad8 | 4622 | goto out_iov; |
7c0c7269 OS |
4623 | } |
4624 | pos = args.offset; | |
4625 | ret = rw_verify_area(WRITE, file, &pos, args.len); | |
4626 | if (ret < 0) | |
2f4d8ad8 | 4627 | goto out_iov; |
7c0c7269 OS |
4628 | |
4629 | init_sync_kiocb(&kiocb, file); | |
4630 | ret = kiocb_set_rw_flags(&kiocb, 0); | |
4631 | if (ret) | |
2f4d8ad8 | 4632 | goto out_iov; |
7c0c7269 OS |
4633 | kiocb.ki_pos = pos; |
4634 | ||
2f4d8ad8 AG |
4635 | file_start_write(file); |
4636 | ||
7c0c7269 OS |
4637 | ret = btrfs_do_write_iter(&kiocb, &iter, &args); |
4638 | if (ret > 0) | |
4639 | fsnotify_modify(file); | |
4640 | ||
7c0c7269 | 4641 | file_end_write(file); |
2f4d8ad8 | 4642 | out_iov: |
7c0c7269 OS |
4643 | kfree(iov); |
4644 | out_acct: | |
4645 | if (ret > 0) | |
4646 | add_wchar(current, ret); | |
4647 | inc_syscw(current); | |
4648 | return ret; | |
4649 | } | |
4650 | ||
f46b5a66 CH |
4651 | long btrfs_ioctl(struct file *file, unsigned int |
4652 | cmd, unsigned long arg) | |
4653 | { | |
0b246afa | 4654 | struct inode *inode = file_inode(file); |
41044b41 | 4655 | struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); |
0b246afa | 4656 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4bcabaa3 | 4657 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4658 | |
4659 | switch (cmd) { | |
6cbff00f | 4660 | case FS_IOC_GETVERSION: |
dc408ccd | 4661 | return btrfs_ioctl_getversion(inode, argp); |
40cf931f | 4662 | case FS_IOC_GETFSLABEL: |
b929c1d8 | 4663 | return btrfs_ioctl_get_fslabel(fs_info, argp); |
40cf931f ES |
4664 | case FS_IOC_SETFSLABEL: |
4665 | return btrfs_ioctl_set_fslabel(file, argp); | |
f7039b1d | 4666 | case FITRIM: |
b929c1d8 | 4667 | return btrfs_ioctl_fitrim(fs_info, argp); |
f46b5a66 | 4668 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4669 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4670 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4671 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4672 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4673 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4674 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4675 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c | 4676 | case BTRFS_IOC_SNAP_DESTROY: |
949964c9 MPS |
4677 | return btrfs_ioctl_snap_destroy(file, argp, false); |
4678 | case BTRFS_IOC_SNAP_DESTROY_V2: | |
4679 | return btrfs_ioctl_snap_destroy(file, argp, true); | |
0caa102d | 4680 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
9ad12305 | 4681 | return btrfs_ioctl_subvol_getflags(inode, argp); |
0caa102d LZ |
4682 | case BTRFS_IOC_SUBVOL_SETFLAGS: |
4683 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4684 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4685 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4686 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4687 | return btrfs_ioctl_defrag(file, NULL); |
4688 | case BTRFS_IOC_DEFRAG_RANGE: | |
4689 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4690 | case BTRFS_IOC_RESIZE: |
198605a8 | 4691 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4692 | case BTRFS_IOC_ADD_DEV: |
2ff7e61e | 4693 | return btrfs_ioctl_add_dev(fs_info, argp); |
f46b5a66 | 4694 | case BTRFS_IOC_RM_DEV: |
da24927b | 4695 | return btrfs_ioctl_rm_dev(file, argp); |
6b526ed7 AJ |
4696 | case BTRFS_IOC_RM_DEV_V2: |
4697 | return btrfs_ioctl_rm_dev_v2(file, argp); | |
475f6387 | 4698 | case BTRFS_IOC_FS_INFO: |
2ff7e61e | 4699 | return btrfs_ioctl_fs_info(fs_info, argp); |
475f6387 | 4700 | case BTRFS_IOC_DEV_INFO: |
2ff7e61e | 4701 | return btrfs_ioctl_dev_info(fs_info, argp); |
ac8e9819 | 4702 | case BTRFS_IOC_TREE_SEARCH: |
9ad12305 | 4703 | return btrfs_ioctl_tree_search(inode, argp); |
cc68a8a5 | 4704 | case BTRFS_IOC_TREE_SEARCH_V2: |
9ad12305 | 4705 | return btrfs_ioctl_tree_search_v2(inode, argp); |
ac8e9819 | 4706 | case BTRFS_IOC_INO_LOOKUP: |
dc408ccd | 4707 | return btrfs_ioctl_ino_lookup(root, argp); |
d7728c96 JS |
4708 | case BTRFS_IOC_INO_PATHS: |
4709 | return btrfs_ioctl_ino_to_path(root, argp); | |
4710 | case BTRFS_IOC_LOGICAL_INO: | |
d24a67b2 ZB |
4711 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); |
4712 | case BTRFS_IOC_LOGICAL_INO_V2: | |
4713 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); | |
1406e432 | 4714 | case BTRFS_IOC_SPACE_INFO: |
2ff7e61e | 4715 | return btrfs_ioctl_space_info(fs_info, argp); |
9b199859 FDBM |
4716 | case BTRFS_IOC_SYNC: { |
4717 | int ret; | |
4718 | ||
9db4dc24 | 4719 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); |
9b199859 FDBM |
4720 | if (ret) |
4721 | return ret; | |
0b246afa | 4722 | ret = btrfs_sync_fs(inode->i_sb, 1); |
2fad4e83 DS |
4723 | /* |
4724 | * The transaction thread may want to do more work, | |
01327610 | 4725 | * namely it pokes the cleaner kthread that will start |
2fad4e83 DS |
4726 | * processing uncleaned subvols. |
4727 | */ | |
0b246afa | 4728 | wake_up_process(fs_info->transaction_kthread); |
9b199859 FDBM |
4729 | return ret; |
4730 | } | |
46204592 | 4731 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4732 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4733 | case BTRFS_IOC_WAIT_SYNC: |
2ff7e61e | 4734 | return btrfs_ioctl_wait_sync(fs_info, argp); |
475f6387 | 4735 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4736 | return btrfs_ioctl_scrub(file, argp); |
475f6387 | 4737 | case BTRFS_IOC_SCRUB_CANCEL: |
2ff7e61e | 4738 | return btrfs_ioctl_scrub_cancel(fs_info); |
475f6387 | 4739 | case BTRFS_IOC_SCRUB_PROGRESS: |
2ff7e61e | 4740 | return btrfs_ioctl_scrub_progress(fs_info, argp); |
c9e9f97b | 4741 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4742 | return btrfs_ioctl_balance(file, argp); |
837d5b6e | 4743 | case BTRFS_IOC_BALANCE_CTL: |
2ff7e61e | 4744 | return btrfs_ioctl_balance_ctl(fs_info, arg); |
19a39dce | 4745 | case BTRFS_IOC_BALANCE_PROGRESS: |
2ff7e61e | 4746 | return btrfs_ioctl_balance_progress(fs_info, argp); |
8ea05e3a AB |
4747 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4748 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
4749 | #ifdef CONFIG_64BIT |
4750 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
4751 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
4752 | #endif | |
31db9f7c | 4753 | case BTRFS_IOC_SEND: |
9ad12305 | 4754 | return _btrfs_ioctl_send(inode, argp, false); |
2351f431 JB |
4755 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
4756 | case BTRFS_IOC_SEND_32: | |
9ad12305 | 4757 | return _btrfs_ioctl_send(inode, argp, true); |
2351f431 | 4758 | #endif |
c11d2c23 | 4759 | case BTRFS_IOC_GET_DEV_STATS: |
2ff7e61e | 4760 | return btrfs_ioctl_get_dev_stats(fs_info, argp); |
5d13a37b | 4761 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4762 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4763 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4764 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4765 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4766 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4767 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4768 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4769 | case BTRFS_IOC_QUOTA_RESCAN: |
4770 | return btrfs_ioctl_quota_rescan(file, argp); | |
4771 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
b929c1d8 | 4772 | return btrfs_ioctl_quota_rescan_status(fs_info, argp); |
57254b6e | 4773 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
b929c1d8 | 4774 | return btrfs_ioctl_quota_rescan_wait(fs_info, argp); |
3f6bcfbd | 4775 | case BTRFS_IOC_DEV_REPLACE: |
2ff7e61e | 4776 | return btrfs_ioctl_dev_replace(fs_info, argp); |
2eaa055f | 4777 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 4778 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f | 4779 | case BTRFS_IOC_GET_FEATURES: |
b929c1d8 | 4780 | return btrfs_ioctl_get_features(fs_info, argp); |
2eaa055f JM |
4781 | case BTRFS_IOC_SET_FEATURES: |
4782 | return btrfs_ioctl_set_features(file, argp); | |
b64ec075 | 4783 | case BTRFS_IOC_GET_SUBVOL_INFO: |
9ad12305 | 4784 | return btrfs_ioctl_get_subvol_info(inode, argp); |
42e4b520 | 4785 | case BTRFS_IOC_GET_SUBVOL_ROOTREF: |
dc408ccd | 4786 | return btrfs_ioctl_get_subvol_rootref(root, argp); |
23d0b79d TM |
4787 | case BTRFS_IOC_INO_LOOKUP_USER: |
4788 | return btrfs_ioctl_ino_lookup_user(file, argp); | |
14605409 BB |
4789 | case FS_IOC_ENABLE_VERITY: |
4790 | return fsverity_ioctl_enable(file, (const void __user *)argp); | |
4791 | case FS_IOC_MEASURE_VERITY: | |
4792 | return fsverity_ioctl_measure(file, argp); | |
1881fba8 OS |
4793 | case BTRFS_IOC_ENCODED_READ: |
4794 | return btrfs_ioctl_encoded_read(file, argp, false); | |
7c0c7269 OS |
4795 | case BTRFS_IOC_ENCODED_WRITE: |
4796 | return btrfs_ioctl_encoded_write(file, argp, false); | |
1881fba8 OS |
4797 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
4798 | case BTRFS_IOC_ENCODED_READ_32: | |
4799 | return btrfs_ioctl_encoded_read(file, argp, true); | |
7c0c7269 OS |
4800 | case BTRFS_IOC_ENCODED_WRITE_32: |
4801 | return btrfs_ioctl_encoded_write(file, argp, true); | |
1881fba8 | 4802 | #endif |
f46b5a66 CH |
4803 | } |
4804 | ||
4805 | return -ENOTTY; | |
4806 | } | |
4c63c245 LD |
4807 | |
4808 | #ifdef CONFIG_COMPAT | |
4809 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
4810 | { | |
2a362249 JM |
4811 | /* |
4812 | * These all access 32-bit values anyway so no further | |
4813 | * handling is necessary. | |
4814 | */ | |
4c63c245 | 4815 | switch (cmd) { |
4c63c245 LD |
4816 | case FS_IOC32_GETVERSION: |
4817 | cmd = FS_IOC_GETVERSION; | |
4818 | break; | |
4c63c245 LD |
4819 | } |
4820 | ||
4821 | return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); | |
4822 | } | |
4823 | #endif |