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Commit | Line | Data |
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d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
487ea5af | 17 | #include <linux/moduleparam.h> |
c30da2e9 DH |
18 | #include <linux/fs_context.h> |
19 | #include <linux/fs_parser.h> | |
d8a5ba45 | 20 | #include <linux/statfs.h> |
9c8ef561 | 21 | #include <linux/random.h> |
e8edc6e0 | 22 | #include <linux/sched.h> |
dbd561d2 | 23 | #include <linux/exportfs.h> |
60bcc88a | 24 | #include <linux/posix_acl.h> |
0b6e9ea0 | 25 | #include <linux/pid_namespace.h> |
c086df49 | 26 | #include <uapi/linux/magic.h> |
d8a5ba45 MS |
27 | |
28 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
29 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
e18b890b | 32 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
33 | struct list_head fuse_conn_list; |
34 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 35 | |
e4dca7b7 | 36 | static int set_global_limit(const char *val, const struct kernel_param *kp); |
487ea5af | 37 | |
79a9d994 | 38 | unsigned max_user_bgreq; |
487ea5af CH |
39 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
40 | &max_user_bgreq, 0644); | |
41 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
42 | MODULE_PARM_DESC(max_user_bgreq, | |
43 | "Global limit for the maximum number of backgrounded requests an " | |
44 | "unprivileged user can set"); | |
45 | ||
79a9d994 | 46 | unsigned max_user_congthresh; |
487ea5af CH |
47 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
48 | &max_user_congthresh, 0644); | |
49 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
50 | MODULE_PARM_DESC(max_user_congthresh, | |
51 | "Global limit for the maximum congestion threshold an " | |
52 | "unprivileged user can set"); | |
53 | ||
d1875dba MS |
54 | #define FUSE_DEFAULT_BLKSIZE 512 |
55 | ||
7a6d3c8b CH |
56 | /** Maximum number of outstanding background requests */ |
57 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
58 | ||
59 | /** Congestion starts at 75% of maximum */ | |
60 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
61 | ||
c30da2e9 DH |
62 | #ifdef CONFIG_BLOCK |
63 | static struct file_system_type fuseblk_fs_type; | |
64 | #endif | |
65 | ||
a2daff68 | 66 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca | 67 | { |
dc69e98c | 68 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL_ACCOUNT); |
07e77dca MS |
69 | } |
70 | ||
d8a5ba45 MS |
71 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
72 | { | |
d8a5ba45 MS |
73 | struct fuse_inode *fi; |
74 | ||
fd60b288 | 75 | fi = alloc_inode_sb(sb, fuse_inode_cachep, GFP_KERNEL); |
9031a69c | 76 | if (!fi) |
d8a5ba45 MS |
77 | return NULL; |
78 | ||
0a0898cf | 79 | fi->i_time = 0; |
d3045530 | 80 | fi->inval_mask = ~0; |
d8a5ba45 | 81 | fi->nodeid = 0; |
9e6268db | 82 | fi->nlookup = 0; |
fbee36b9 | 83 | fi->attr_version = 0; |
45c72cd7 | 84 | fi->orig_ino = 0; |
4582a4ab | 85 | fi->state = 0; |
5c672ab3 | 86 | mutex_init(&fi->mutex); |
f15ecfef | 87 | spin_lock_init(&fi->lock); |
07e77dca | 88 | fi->forget = fuse_alloc_forget(); |
c2d0ad00 VG |
89 | if (!fi->forget) |
90 | goto out_free; | |
91 | ||
92 | if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi)) | |
93 | goto out_free_forget; | |
d8a5ba45 | 94 | |
9031a69c | 95 | return &fi->inode; |
c2d0ad00 VG |
96 | |
97 | out_free_forget: | |
98 | kfree(fi->forget); | |
99 | out_free: | |
100 | kmem_cache_free(fuse_inode_cachep, fi); | |
101 | return NULL; | |
d8a5ba45 MS |
102 | } |
103 | ||
9baf28bb | 104 | static void fuse_free_inode(struct inode *inode) |
d8a5ba45 | 105 | { |
e5e5558e | 106 | struct fuse_inode *fi = get_fuse_inode(inode); |
9baf28bb | 107 | |
5c672ab3 | 108 | mutex_destroy(&fi->mutex); |
07e77dca | 109 | kfree(fi->forget); |
c2d0ad00 VG |
110 | #ifdef CONFIG_FUSE_DAX |
111 | kfree(fi->dax); | |
112 | #endif | |
9baf28bb | 113 | kmem_cache_free(fuse_inode_cachep, fi); |
d8a5ba45 MS |
114 | } |
115 | ||
b57922d9 | 116 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 117 | { |
9baf28bb AV |
118 | struct fuse_inode *fi = get_fuse_inode(inode); |
119 | ||
5c791fe1 MS |
120 | /* Will write inode on close/munmap and in all other dirtiers */ |
121 | WARN_ON(inode->i_state & I_DIRTY_INODE); | |
122 | ||
91b0abe3 | 123 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 124 | clear_inode(inode); |
1751e8a6 | 125 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 126 | struct fuse_conn *fc = get_fuse_conn(inode); |
c2d0ad00 VG |
127 | |
128 | if (FUSE_IS_DAX(inode)) | |
129 | fuse_dax_inode_cleanup(inode); | |
1866d779 MR |
130 | if (fi->nlookup) { |
131 | fuse_queue_forget(fc, fi->forget, fi->nodeid, | |
132 | fi->nlookup); | |
133 | fi->forget = NULL; | |
134 | } | |
e5e5558e | 135 | } |
5d069dbe | 136 | if (S_ISREG(inode->i_mode) && !fuse_is_bad(inode)) { |
9baf28bb AV |
137 | WARN_ON(!list_empty(&fi->write_files)); |
138 | WARN_ON(!list_empty(&fi->queued_writes)); | |
139 | } | |
d8a5ba45 MS |
140 | } |
141 | ||
84c21507 | 142 | static int fuse_reconfigure(struct fs_context *fsc) |
71421259 | 143 | { |
84c21507 | 144 | struct super_block *sb = fsc->root->d_sb; |
0189a2d3 | 145 | |
02b9984d | 146 | sync_filesystem(sb); |
84c21507 | 147 | if (fsc->sb_flags & SB_MANDLOCK) |
71421259 MS |
148 | return -EINVAL; |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
45c72cd7 PS |
153 | /* |
154 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
155 | * so that it will fit. | |
156 | */ | |
157 | static ino_t fuse_squash_ino(u64 ino64) | |
158 | { | |
159 | ino_t ino = (ino_t) ino64; | |
160 | if (sizeof(ino_t) < sizeof(u64)) | |
161 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
162 | return ino; | |
163 | } | |
164 | ||
3be5a52b | 165 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
972f4c46 | 166 | struct fuse_statx *sx, |
4b52f059 | 167 | u64 attr_valid, u32 cache_mask) |
d8a5ba45 | 168 | { |
9ffbb916 | 169 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 170 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 171 | |
f15ecfef KT |
172 | lockdep_assert_held(&fi->lock); |
173 | ||
4510d86f | 174 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
1fb69e78 | 175 | fi->i_time = attr_valid; |
d3045530 MS |
176 | /* Clear basic stats from invalid mask */ |
177 | set_mask_bits(&fi->inval_mask, STATX_BASIC_STATS, 0); | |
1fb69e78 | 178 | |
45c72cd7 | 179 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 180 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 181 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
182 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
183 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 | 184 | inode->i_blocks = attr->blocks; |
47912eaa MS |
185 | |
186 | /* Sanitize nsecs */ | |
187 | attr->atimensec = min_t(u32, attr->atimensec, NSEC_PER_SEC - 1); | |
188 | attr->mtimensec = min_t(u32, attr->mtimensec, NSEC_PER_SEC - 1); | |
189 | attr->ctimensec = min_t(u32, attr->ctimensec, NSEC_PER_SEC - 1); | |
190 | ||
3c0d5df2 | 191 | inode_set_atime(inode, attr->atime, attr->atimensec); |
b0aa7606 | 192 | /* mtime from server may be stale due to local buffered write */ |
4b52f059 | 193 | if (!(cache_mask & STATX_MTIME)) { |
3c0d5df2 | 194 | inode_set_mtime(inode, attr->mtime, attr->mtimensec); |
4b52f059 MS |
195 | } |
196 | if (!(cache_mask & STATX_CTIME)) { | |
ceb2d5e9 | 197 | inode_set_ctime(inode, attr->ctime, attr->ctimensec); |
b0aa7606 | 198 | } |
972f4c46 MS |
199 | if (sx) { |
200 | /* Sanitize nsecs */ | |
201 | sx->btime.tv_nsec = | |
202 | min_t(u32, sx->btime.tv_nsec, NSEC_PER_SEC - 1); | |
203 | ||
204 | /* | |
205 | * Btime has been queried, cache is valid (whether or not btime | |
206 | * is available or not) so clear STATX_BTIME from inval_mask. | |
207 | * | |
208 | * Availability of the btime attribute is indicated in | |
209 | * FUSE_I_BTIME | |
210 | */ | |
211 | set_mask_bits(&fi->inval_mask, STATX_BTIME, 0); | |
212 | if (sx->mask & STATX_BTIME) { | |
213 | set_bit(FUSE_I_BTIME, &fi->state); | |
214 | fi->i_btime.tv_sec = sx->btime.tv_sec; | |
215 | fi->i_btime.tv_nsec = sx->btime.tv_nsec; | |
216 | } | |
217 | } | |
e00d2c2d | 218 | |
0e9663ee MS |
219 | if (attr->blksize != 0) |
220 | inode->i_blkbits = ilog2(attr->blksize); | |
221 | else | |
222 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
223 | ||
ebc14c4d MS |
224 | /* |
225 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
226 | * to check permissions. This prevents failures due to the | |
227 | * check in may_delete(). | |
228 | */ | |
229 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 230 | if (!fc->default_permissions) |
ebc14c4d | 231 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
232 | |
233 | fi->orig_ino = attr->ino; | |
9d769e6a VG |
234 | |
235 | /* | |
236 | * We are refreshing inode data and it is possible that another | |
237 | * client set suid/sgid or security.capability xattr. So clear | |
238 | * S_NOSEC. Ideally, we could have cleared it only if suid/sgid | |
239 | * was set or if security.capability xattr was set. But we don't | |
240 | * know if security.capability has been set or not. So clear it | |
241 | * anyway. Its less efficient but should be safe. | |
242 | */ | |
243 | inode->i_flags &= ~S_NOSEC; | |
3be5a52b MS |
244 | } |
245 | ||
4b52f059 MS |
246 | u32 fuse_get_cache_mask(struct inode *inode) |
247 | { | |
248 | struct fuse_conn *fc = get_fuse_conn(inode); | |
249 | ||
250 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) | |
251 | return 0; | |
252 | ||
253 | return STATX_MTIME | STATX_CTIME | STATX_SIZE; | |
254 | } | |
255 | ||
3be5a52b | 256 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
972f4c46 | 257 | struct fuse_statx *sx, |
3be5a52b MS |
258 | u64 attr_valid, u64 attr_version) |
259 | { | |
260 | struct fuse_conn *fc = get_fuse_conn(inode); | |
261 | struct fuse_inode *fi = get_fuse_inode(inode); | |
4b52f059 | 262 | u32 cache_mask; |
3be5a52b | 263 | loff_t oldsize; |
a64ba10f | 264 | struct timespec64 old_mtime; |
3be5a52b | 265 | |
f15ecfef | 266 | spin_lock(&fi->lock); |
04d82db0 MS |
267 | /* |
268 | * In case of writeback_cache enabled, writes update mtime, ctime and | |
269 | * may update i_size. In these cases trust the cached value in the | |
270 | * inode. | |
271 | */ | |
4b52f059 MS |
272 | cache_mask = fuse_get_cache_mask(inode); |
273 | if (cache_mask & STATX_SIZE) | |
04d82db0 | 274 | attr->size = i_size_read(inode); |
4b52f059 MS |
275 | |
276 | if (cache_mask & STATX_MTIME) { | |
3c0d5df2 JL |
277 | attr->mtime = inode_get_mtime_sec(inode); |
278 | attr->mtimensec = inode_get_mtime_nsec(inode); | |
4b52f059 MS |
279 | } |
280 | if (cache_mask & STATX_CTIME) { | |
3c0d5df2 JL |
281 | attr->ctime = inode_get_ctime_sec(inode); |
282 | attr->ctimensec = inode_get_ctime_nsec(inode); | |
04d82db0 MS |
283 | } |
284 | ||
06a7c3c2 MP |
285 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
286 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 287 | spin_unlock(&fi->lock); |
3be5a52b MS |
288 | return; |
289 | } | |
290 | ||
3c0d5df2 | 291 | old_mtime = inode_get_mtime(inode); |
972f4c46 | 292 | fuse_change_attributes_common(inode, attr, sx, attr_valid, cache_mask); |
ebc14c4d | 293 | |
e00d2c2d | 294 | oldsize = inode->i_size; |
8373200b PE |
295 | /* |
296 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
297 | * extend local i_size without keeping userspace server in sync. So, | |
298 | * attr->size coming from server can be stale. We cannot trust it. | |
299 | */ | |
4b52f059 | 300 | if (!(cache_mask & STATX_SIZE)) |
8373200b | 301 | i_size_write(inode, attr->size); |
f15ecfef | 302 | spin_unlock(&fi->lock); |
e00d2c2d | 303 | |
4b52f059 | 304 | if (!cache_mask && S_ISREG(inode->i_mode)) { |
eed2179e BF |
305 | bool inval = false; |
306 | ||
307 | if (oldsize != attr->size) { | |
7caef267 | 308 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
309 | if (!fc->explicit_inval_data) |
310 | inval = true; | |
eed2179e | 311 | } else if (fc->auto_inval_data) { |
a64ba10f | 312 | struct timespec64 new_mtime = { |
eed2179e BF |
313 | .tv_sec = attr->mtime, |
314 | .tv_nsec = attr->mtimensec, | |
315 | }; | |
316 | ||
317 | /* | |
318 | * Auto inval mode also checks and invalidates if mtime | |
319 | * has changed. | |
320 | */ | |
a64ba10f | 321 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
322 | inval = true; |
323 | } | |
324 | ||
325 | if (inval) | |
326 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 327 | } |
c3cb6f93 JX |
328 | |
329 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
330 | fuse_dax_dontcache(inode, attr->flags); | |
d8a5ba45 MS |
331 | } |
332 | ||
facd6105 CB |
333 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr, |
334 | struct fuse_conn *fc) | |
d8a5ba45 MS |
335 | { |
336 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 337 | inode->i_size = attr->size; |
3c0d5df2 | 338 | inode_set_mtime(inode, attr->mtime, attr->mtimensec); |
ceb2d5e9 | 339 | inode_set_ctime(inode, attr->ctime, attr->ctimensec); |
e5e5558e MS |
340 | if (S_ISREG(inode->i_mode)) { |
341 | fuse_init_common(inode); | |
93a497b9 | 342 | fuse_init_file_inode(inode, attr->flags); |
e5e5558e MS |
343 | } else if (S_ISDIR(inode->i_mode)) |
344 | fuse_init_dir(inode); | |
345 | else if (S_ISLNK(inode->i_mode)) | |
346 | fuse_init_symlink(inode); | |
347 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
348 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
349 | fuse_init_common(inode); | |
350 | init_special_inode(inode, inode->i_mode, | |
351 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
352 | } else |
353 | BUG(); | |
facd6105 CB |
354 | /* |
355 | * Ensure that we don't cache acls for daemons without FUSE_POSIX_ACL | |
356 | * so they see the exact same behavior as before. | |
357 | */ | |
358 | if (!fc->posix_acl) | |
359 | inode->i_acl = inode->i_default_acl = ACL_DONT_CACHE; | |
d8a5ba45 MS |
360 | } |
361 | ||
fcee216b | 362 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 363 | { |
b48badf0 | 364 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
365 | if (get_node_id(inode) == nodeid) |
366 | return 1; | |
367 | else | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
372 | { | |
b48badf0 | 373 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
374 | get_fuse_inode(inode)->nodeid = nodeid; |
375 | return 0; | |
376 | } | |
377 | ||
b48badf0 | 378 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
379 | int generation, struct fuse_attr *attr, |
380 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
381 | { |
382 | struct inode *inode; | |
9e6268db | 383 | struct fuse_inode *fi; |
d8a5ba45 | 384 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 | 385 | |
bf109c64 MR |
386 | /* |
387 | * Auto mount points get their node id from the submount root, which is | |
388 | * not a unique identifier within this filesystem. | |
389 | * | |
390 | * To avoid conflicts, do not place submount points into the inode hash | |
391 | * table. | |
392 | */ | |
393 | if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) && | |
394 | S_ISDIR(attr->mode)) { | |
395 | inode = new_inode(sb); | |
396 | if (!inode) | |
397 | return NULL; | |
398 | ||
facd6105 | 399 | fuse_init_inode(inode, attr, fc); |
bf109c64 MR |
400 | get_fuse_inode(inode)->nodeid = nodeid; |
401 | inode->i_flags |= S_AUTOMOUNT; | |
402 | goto done; | |
403 | } | |
404 | ||
405 | retry: | |
d8a5ba45 MS |
406 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
407 | if (!inode) | |
408 | return NULL; | |
409 | ||
410 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 411 | inode->i_flags |= S_NOATIME; |
d31433c8 | 412 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 413 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 414 | inode->i_generation = generation; |
facd6105 | 415 | fuse_init_inode(inode, attr, fc); |
d8a5ba45 | 416 | unlock_new_inode(inode); |
15db1683 AG |
417 | } else if (fuse_stale_inode(inode, generation, attr)) { |
418 | /* nodeid was reused, any I/O on the old inode should fail */ | |
5d069dbe | 419 | fuse_make_bad(inode); |
d8a5ba45 | 420 | iput(inode); |
d8a5ba45 MS |
421 | goto retry; |
422 | } | |
bf109c64 | 423 | done: |
9e6268db | 424 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 425 | spin_lock(&fi->lock); |
1729a16c | 426 | fi->nlookup++; |
c9d8f5f0 | 427 | spin_unlock(&fi->lock); |
972f4c46 | 428 | fuse_change_attributes(inode, attr, NULL, attr_valid, attr_version); |
1fb69e78 | 429 | |
d8a5ba45 MS |
430 | return inode; |
431 | } | |
432 | ||
fcee216b MR |
433 | struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid, |
434 | struct fuse_mount **fm) | |
435 | { | |
436 | struct fuse_mount *fm_iter; | |
437 | struct inode *inode; | |
438 | ||
439 | WARN_ON(!rwsem_is_locked(&fc->killsb)); | |
440 | list_for_each_entry(fm_iter, &fc->mounts, fc_entry) { | |
441 | if (!fm_iter->sb) | |
442 | continue; | |
443 | ||
444 | inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid); | |
445 | if (inode) { | |
446 | if (fm) | |
447 | *fm = fm_iter; | |
448 | return inode; | |
449 | } | |
450 | } | |
451 | ||
452 | return NULL; | |
453 | } | |
454 | ||
455 | int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid, | |
3b463ae0 JM |
456 | loff_t offset, loff_t len) |
457 | { | |
5ddd9ced | 458 | struct fuse_inode *fi; |
3b463ae0 JM |
459 | struct inode *inode; |
460 | pgoff_t pg_start; | |
461 | pgoff_t pg_end; | |
462 | ||
fcee216b | 463 | inode = fuse_ilookup(fc, nodeid, NULL); |
3b463ae0 JM |
464 | if (!inode) |
465 | return -ENOENT; | |
466 | ||
5ddd9ced MS |
467 | fi = get_fuse_inode(inode); |
468 | spin_lock(&fi->lock); | |
469 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
470 | spin_unlock(&fi->lock); | |
471 | ||
3b463ae0 | 472 | fuse_invalidate_attr(inode); |
60bcc88a | 473 | forget_all_cached_acls(inode); |
3b463ae0 | 474 | if (offset >= 0) { |
09cbfeaf | 475 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
476 | if (len <= 0) |
477 | pg_end = -1; | |
478 | else | |
09cbfeaf | 479 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
480 | invalidate_inode_pages2_range(inode->i_mapping, |
481 | pg_start, pg_end); | |
482 | } | |
483 | iput(inode); | |
484 | return 0; | |
485 | } | |
486 | ||
63576c13 | 487 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 488 | { |
63576c13 MS |
489 | bool locked = false; |
490 | ||
491 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 492 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
493 | locked = true; |
494 | } | |
495 | ||
496 | return locked; | |
5c672ab3 MS |
497 | } |
498 | ||
63576c13 | 499 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 500 | { |
63576c13 | 501 | if (locked) |
5c672ab3 MS |
502 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
503 | } | |
504 | ||
42faad99 | 505 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 506 | { |
15c8e72e VG |
507 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
508 | ||
247861c3 DL |
509 | if (fc->no_force_umount) |
510 | return; | |
511 | ||
512 | fuse_abort_conn(fc); | |
513 | ||
514 | // Only retire block-device-based superblocks. | |
515 | if (sb->s_bdev != NULL) | |
516 | retire_super(sb); | |
69a53bf2 MS |
517 | } |
518 | ||
fcee216b | 519 | static void fuse_send_destroy(struct fuse_mount *fm) |
0ec7ca41 | 520 | { |
fcee216b | 521 | if (fm->fc->conn_init) { |
1ccd1ea2 MS |
522 | FUSE_ARGS(args); |
523 | ||
524 | args.opcode = FUSE_DESTROY; | |
525 | args.force = true; | |
526 | args.nocreds = true; | |
fcee216b | 527 | fuse_simple_request(fm, &args); |
0ec7ca41 MS |
528 | } |
529 | } | |
530 | ||
e5e5558e MS |
531 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
532 | { | |
533 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
534 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 535 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
536 | stbuf->f_blocks = attr->blocks; |
537 | stbuf->f_bfree = attr->bfree; | |
538 | stbuf->f_bavail = attr->bavail; | |
539 | stbuf->f_files = attr->files; | |
540 | stbuf->f_ffree = attr->ffree; | |
541 | stbuf->f_namelen = attr->namelen; | |
542 | /* fsid is left zero */ | |
543 | } | |
544 | ||
726c3342 | 545 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 546 | { |
726c3342 | 547 | struct super_block *sb = dentry->d_sb; |
fcee216b | 548 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 549 | FUSE_ARGS(args); |
e5e5558e MS |
550 | struct fuse_statfs_out outarg; |
551 | int err; | |
552 | ||
fcee216b | 553 | if (!fuse_allow_current_process(fm->fc)) { |
e57ac683 MS |
554 | buf->f_type = FUSE_SUPER_MAGIC; |
555 | return 0; | |
556 | } | |
557 | ||
de5f1202 | 558 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
559 | args.in_numargs = 0; |
560 | args.opcode = FUSE_STATFS; | |
561 | args.nodeid = get_node_id(d_inode(dentry)); | |
562 | args.out_numargs = 1; | |
563 | args.out_args[0].size = sizeof(outarg); | |
564 | args.out_args[0].value = &outarg; | |
fcee216b | 565 | err = fuse_simple_request(fm, &args); |
e5e5558e MS |
566 | if (!err) |
567 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
568 | return err; |
569 | } | |
570 | ||
660585b5 MS |
571 | static struct fuse_sync_bucket *fuse_sync_bucket_alloc(void) |
572 | { | |
573 | struct fuse_sync_bucket *bucket; | |
574 | ||
575 | bucket = kzalloc(sizeof(*bucket), GFP_KERNEL | __GFP_NOFAIL); | |
576 | if (bucket) { | |
577 | init_waitqueue_head(&bucket->waitq); | |
578 | /* Initial active count */ | |
579 | atomic_set(&bucket->count, 1); | |
580 | } | |
581 | return bucket; | |
582 | } | |
583 | ||
584 | static void fuse_sync_fs_writes(struct fuse_conn *fc) | |
585 | { | |
586 | struct fuse_sync_bucket *bucket, *new_bucket; | |
587 | int count; | |
588 | ||
589 | new_bucket = fuse_sync_bucket_alloc(); | |
590 | spin_lock(&fc->lock); | |
591 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); | |
592 | count = atomic_read(&bucket->count); | |
593 | WARN_ON(count < 1); | |
594 | /* No outstanding writes? */ | |
595 | if (count == 1) { | |
596 | spin_unlock(&fc->lock); | |
597 | kfree(new_bucket); | |
598 | return; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Completion of new bucket depends on completion of this bucket, so add | |
603 | * one more count. | |
604 | */ | |
605 | atomic_inc(&new_bucket->count); | |
606 | rcu_assign_pointer(fc->curr_bucket, new_bucket); | |
607 | spin_unlock(&fc->lock); | |
608 | /* | |
609 | * Drop initial active count. At this point if all writes in this and | |
610 | * ancestor buckets complete, the count will go to zero and this task | |
611 | * will be woken up. | |
612 | */ | |
613 | atomic_dec(&bucket->count); | |
614 | ||
615 | wait_event(bucket->waitq, atomic_read(&bucket->count) == 0); | |
616 | ||
617 | /* Drop temp count on descendant bucket */ | |
618 | fuse_sync_bucket_dec(new_bucket); | |
619 | kfree_rcu(bucket, rcu); | |
620 | } | |
621 | ||
2d82ab25 GK |
622 | static int fuse_sync_fs(struct super_block *sb, int wait) |
623 | { | |
624 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
625 | struct fuse_conn *fc = fm->fc; | |
626 | struct fuse_syncfs_in inarg; | |
627 | FUSE_ARGS(args); | |
628 | int err; | |
629 | ||
630 | /* | |
631 | * Userspace cannot handle the wait == 0 case. Avoid a | |
632 | * gratuitous roundtrip. | |
633 | */ | |
634 | if (!wait) | |
635 | return 0; | |
636 | ||
637 | /* The filesystem is being unmounted. Nothing to do. */ | |
638 | if (!sb->s_root) | |
639 | return 0; | |
640 | ||
641 | if (!fc->sync_fs) | |
642 | return 0; | |
643 | ||
660585b5 MS |
644 | fuse_sync_fs_writes(fc); |
645 | ||
2d82ab25 GK |
646 | memset(&inarg, 0, sizeof(inarg)); |
647 | args.in_numargs = 1; | |
648 | args.in_args[0].size = sizeof(inarg); | |
649 | args.in_args[0].value = &inarg; | |
650 | args.opcode = FUSE_SYNCFS; | |
651 | args.nodeid = get_node_id(sb->s_root->d_inode); | |
652 | args.out_numargs = 0; | |
653 | ||
654 | err = fuse_simple_request(fm, &args); | |
655 | if (err == -ENOSYS) { | |
656 | fc->sync_fs = 0; | |
657 | err = 0; | |
658 | } | |
659 | ||
660 | return err; | |
661 | } | |
662 | ||
d8a5ba45 | 663 | enum { |
c30da2e9 DH |
664 | OPT_SOURCE, |
665 | OPT_SUBTYPE, | |
d8a5ba45 MS |
666 | OPT_FD, |
667 | OPT_ROOTMODE, | |
668 | OPT_USER_ID, | |
87729a55 | 669 | OPT_GROUP_ID, |
d8a5ba45 MS |
670 | OPT_DEFAULT_PERMISSIONS, |
671 | OPT_ALLOW_OTHER, | |
db50b96c | 672 | OPT_MAX_READ, |
d8091614 | 673 | OPT_BLKSIZE, |
d8a5ba45 MS |
674 | OPT_ERR |
675 | }; | |
676 | ||
d7167b14 | 677 | static const struct fs_parameter_spec fuse_fs_parameters[] = { |
c30da2e9 DH |
678 | fsparam_string ("source", OPT_SOURCE), |
679 | fsparam_u32 ("fd", OPT_FD), | |
680 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
681 | fsparam_u32 ("user_id", OPT_USER_ID), | |
682 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
683 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
684 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
685 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
686 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 687 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
688 | {} |
689 | }; | |
690 | ||
84c21507 | 691 | static int fuse_parse_param(struct fs_context *fsc, struct fs_parameter *param) |
233a01fa | 692 | { |
c30da2e9 | 693 | struct fs_parse_result result; |
84c21507 | 694 | struct fuse_fs_context *ctx = fsc->fs_private; |
c30da2e9 DH |
695 | int opt; |
696 | ||
84c21507 | 697 | if (fsc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { |
b330966f MS |
698 | /* |
699 | * Ignore options coming from mount(MS_REMOUNT) for backward | |
700 | * compatibility. | |
701 | */ | |
84c21507 | 702 | if (fsc->oldapi) |
b330966f MS |
703 | return 0; |
704 | ||
84c21507 | 705 | return invalfc(fsc, "No changes allowed in reconfigure"); |
b330966f | 706 | } |
e8b20a47 | 707 | |
84c21507 | 708 | opt = fs_parse(fsc, fuse_fs_parameters, param, &result); |
c30da2e9 DH |
709 | if (opt < 0) |
710 | return opt; | |
711 | ||
712 | switch (opt) { | |
713 | case OPT_SOURCE: | |
84c21507 MS |
714 | if (fsc->source) |
715 | return invalfc(fsc, "Multiple sources specified"); | |
716 | fsc->source = param->string; | |
c30da2e9 DH |
717 | param->string = NULL; |
718 | break; | |
719 | ||
720 | case OPT_SUBTYPE: | |
721 | if (ctx->subtype) | |
84c21507 | 722 | return invalfc(fsc, "Multiple subtypes specified"); |
c30da2e9 DH |
723 | ctx->subtype = param->string; |
724 | param->string = NULL; | |
725 | return 0; | |
726 | ||
727 | case OPT_FD: | |
728 | ctx->fd = result.uint_32; | |
cabdb4fa | 729 | ctx->fd_present = true; |
c30da2e9 DH |
730 | break; |
731 | ||
732 | case OPT_ROOTMODE: | |
733 | if (!fuse_valid_type(result.uint_32)) | |
84c21507 | 734 | return invalfc(fsc, "Invalid rootmode"); |
c30da2e9 | 735 | ctx->rootmode = result.uint_32; |
cabdb4fa | 736 | ctx->rootmode_present = true; |
c30da2e9 DH |
737 | break; |
738 | ||
739 | case OPT_USER_ID: | |
84c21507 | 740 | ctx->user_id = make_kuid(fsc->user_ns, result.uint_32); |
c30da2e9 | 741 | if (!uid_valid(ctx->user_id)) |
84c21507 | 742 | return invalfc(fsc, "Invalid user_id"); |
cabdb4fa | 743 | ctx->user_id_present = true; |
c30da2e9 DH |
744 | break; |
745 | ||
746 | case OPT_GROUP_ID: | |
84c21507 | 747 | ctx->group_id = make_kgid(fsc->user_ns, result.uint_32); |
c30da2e9 | 748 | if (!gid_valid(ctx->group_id)) |
84c21507 | 749 | return invalfc(fsc, "Invalid group_id"); |
cabdb4fa | 750 | ctx->group_id_present = true; |
c30da2e9 DH |
751 | break; |
752 | ||
753 | case OPT_DEFAULT_PERMISSIONS: | |
cabdb4fa | 754 | ctx->default_permissions = true; |
c30da2e9 DH |
755 | break; |
756 | ||
757 | case OPT_ALLOW_OTHER: | |
cabdb4fa | 758 | ctx->allow_other = true; |
c30da2e9 DH |
759 | break; |
760 | ||
761 | case OPT_MAX_READ: | |
762 | ctx->max_read = result.uint_32; | |
763 | break; | |
764 | ||
765 | case OPT_BLKSIZE: | |
766 | if (!ctx->is_bdev) | |
84c21507 | 767 | return invalfc(fsc, "blksize only supported for fuseblk"); |
c30da2e9 DH |
768 | ctx->blksize = result.uint_32; |
769 | break; | |
770 | ||
771 | default: | |
772 | return -EINVAL; | |
233a01fa | 773 | } |
c30da2e9 DH |
774 | |
775 | return 0; | |
233a01fa MS |
776 | } |
777 | ||
84c21507 | 778 | static void fuse_free_fsc(struct fs_context *fsc) |
d8a5ba45 | 779 | { |
84c21507 | 780 | struct fuse_fs_context *ctx = fsc->fs_private; |
5a533682 | 781 | |
c30da2e9 DH |
782 | if (ctx) { |
783 | kfree(ctx->subtype); | |
784 | kfree(ctx); | |
785 | } | |
d8a5ba45 MS |
786 | } |
787 | ||
34c80b1d | 788 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 789 | { |
34c80b1d AV |
790 | struct super_block *sb = root->d_sb; |
791 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 792 | |
f4fd4ae3 VG |
793 | if (fc->legacy_opts_show) { |
794 | seq_printf(m, ",user_id=%u", | |
795 | from_kuid_munged(fc->user_ns, fc->user_id)); | |
796 | seq_printf(m, ",group_id=%u", | |
797 | from_kgid_munged(fc->user_ns, fc->group_id)); | |
798 | if (fc->default_permissions) | |
799 | seq_puts(m, ",default_permissions"); | |
800 | if (fc->allow_other) | |
801 | seq_puts(m, ",allow_other"); | |
802 | if (fc->max_read != ~0) | |
803 | seq_printf(m, ",max_read=%u", fc->max_read); | |
804 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
805 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
806 | } | |
1dd53957 | 807 | #ifdef CONFIG_FUSE_DAX |
780b1b95 JX |
808 | if (fc->dax_mode == FUSE_DAX_ALWAYS) |
809 | seq_puts(m, ",dax=always"); | |
810 | else if (fc->dax_mode == FUSE_DAX_NEVER) | |
811 | seq_puts(m, ",dax=never"); | |
812 | else if (fc->dax_mode == FUSE_DAX_INODE_USER) | |
813 | seq_puts(m, ",dax=inode"); | |
1dd53957 | 814 | #endif |
3f22c746 | 815 | |
d8a5ba45 MS |
816 | return 0; |
817 | } | |
818 | ||
ae3aad77 SH |
819 | static void fuse_iqueue_init(struct fuse_iqueue *fiq, |
820 | const struct fuse_iqueue_ops *ops, | |
821 | void *priv) | |
f88996a9 MS |
822 | { |
823 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
76e43c8c | 824 | spin_lock_init(&fiq->lock); |
f88996a9 MS |
825 | init_waitqueue_head(&fiq->waitq); |
826 | INIT_LIST_HEAD(&fiq->pending); | |
827 | INIT_LIST_HEAD(&fiq->interrupts); | |
828 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 829 | fiq->connected = 1; |
ae3aad77 SH |
830 | fiq->ops = ops; |
831 | fiq->priv = priv; | |
f88996a9 MS |
832 | } |
833 | ||
3a2b5b9c MS |
834 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
835 | { | |
be2ff42c KT |
836 | unsigned int i; |
837 | ||
45a91cb1 | 838 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
839 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
840 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 841 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 842 | fpq->connected = 1; |
3a2b5b9c MS |
843 | } |
844 | ||
fcee216b MR |
845 | void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm, |
846 | struct user_namespace *user_ns, | |
ae3aad77 | 847 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) |
d8a5ba45 | 848 | { |
0d179aa5 TH |
849 | memset(fc, 0, sizeof(*fc)); |
850 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 851 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 852 | init_rwsem(&fc->killsb); |
095fc40a | 853 | refcount_set(&fc->count, 1); |
c3696046 | 854 | atomic_set(&fc->dev_count, 1); |
0d179aa5 | 855 | init_waitqueue_head(&fc->blocked_waitq); |
ae3aad77 | 856 | fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv); |
0d179aa5 TH |
857 | INIT_LIST_HEAD(&fc->bg_queue); |
858 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 859 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 860 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
861 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
862 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 863 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 864 | fc->polled_files = RB_ROOT; |
0aada884 | 865 | fc->blocked = 0; |
796523fb | 866 | fc->initialized = 0; |
e16714d8 | 867 | fc->connected = 1; |
4510d86f | 868 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 869 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 870 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 871 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 872 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
a7f0d7aa | 873 | fc->max_pages_limit = FUSE_MAX_MAX_PAGES; |
fcee216b MR |
874 | |
875 | INIT_LIST_HEAD(&fc->mounts); | |
876 | list_add(&fm->fc_entry, &fc->mounts); | |
877 | fm->fc = fc; | |
d8a5ba45 | 878 | } |
0d179aa5 | 879 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 880 | |
bafa9654 MS |
881 | void fuse_conn_put(struct fuse_conn *fc) |
882 | { | |
095fc40a | 883 | if (refcount_dec_and_test(&fc->count)) { |
a62a8ef9 | 884 | struct fuse_iqueue *fiq = &fc->iq; |
660585b5 | 885 | struct fuse_sync_bucket *bucket; |
a62a8ef9 | 886 | |
1dd53957 VG |
887 | if (IS_ENABLED(CONFIG_FUSE_DAX)) |
888 | fuse_dax_conn_free(fc); | |
a62a8ef9 SH |
889 | if (fiq->ops->release) |
890 | fiq->ops->release(fiq); | |
0b6e9ea0 | 891 | put_pid_ns(fc->pid_ns); |
8cb08329 | 892 | put_user_ns(fc->user_ns); |
660585b5 MS |
893 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); |
894 | if (bucket) { | |
895 | WARN_ON(atomic_read(&bucket->count) != 1); | |
896 | kfree(bucket); | |
897 | } | |
43901aab | 898 | fc->release(fc); |
d2a85164 | 899 | } |
bafa9654 | 900 | } |
08cbf542 | 901 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
902 | |
903 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
904 | { | |
095fc40a | 905 | refcount_inc(&fc->count); |
bafa9654 MS |
906 | return fc; |
907 | } | |
08cbf542 | 908 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 909 | |
b93f858a | 910 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
911 | { |
912 | struct fuse_attr attr; | |
913 | memset(&attr, 0, sizeof(attr)); | |
914 | ||
915 | attr.mode = mode; | |
916 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 917 | attr.nlink = 1; |
1fb69e78 | 918 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
919 | } |
920 | ||
1729a16c | 921 | struct fuse_inode_handle { |
dbd561d2 MS |
922 | u64 nodeid; |
923 | u32 generation; | |
924 | }; | |
925 | ||
926 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
927 | struct fuse_inode_handle *handle) | |
928 | { | |
33670fa2 | 929 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
930 | struct inode *inode; |
931 | struct dentry *entry; | |
932 | int err = -ESTALE; | |
933 | ||
934 | if (handle->nodeid == 0) | |
935 | goto out_err; | |
936 | ||
937 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
938 | if (!inode) { |
939 | struct fuse_entry_out outarg; | |
13983d06 | 940 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
941 | |
942 | if (!fc->export_support) | |
943 | goto out_err; | |
944 | ||
33670fa2 MS |
945 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
946 | &inode); | |
947 | if (err && err != -ENOENT) | |
948 | goto out_err; | |
949 | if (err || !inode) { | |
950 | err = -ESTALE; | |
951 | goto out_err; | |
952 | } | |
953 | err = -EIO; | |
954 | if (get_node_id(inode) != handle->nodeid) | |
955 | goto out_iput; | |
956 | } | |
dbd561d2 MS |
957 | err = -ESTALE; |
958 | if (inode->i_generation != handle->generation) | |
959 | goto out_iput; | |
960 | ||
44003728 | 961 | entry = d_obtain_alias(inode); |
c35eebe9 | 962 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 963 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
964 | |
965 | return entry; | |
966 | ||
967 | out_iput: | |
968 | iput(inode); | |
969 | out_err: | |
970 | return ERR_PTR(err); | |
971 | } | |
972 | ||
b0b0382b AV |
973 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
974 | struct inode *parent) | |
dbd561d2 | 975 | { |
b0b0382b | 976 | int len = parent ? 6 : 3; |
dbd561d2 MS |
977 | u64 nodeid; |
978 | u32 generation; | |
979 | ||
5fe0c237 AK |
980 | if (*max_len < len) { |
981 | *max_len = len; | |
94e07a75 | 982 | return FILEID_INVALID; |
5fe0c237 | 983 | } |
dbd561d2 MS |
984 | |
985 | nodeid = get_fuse_inode(inode)->nodeid; | |
986 | generation = inode->i_generation; | |
987 | ||
988 | fh[0] = (u32)(nodeid >> 32); | |
989 | fh[1] = (u32)(nodeid & 0xffffffff); | |
990 | fh[2] = generation; | |
991 | ||
b0b0382b | 992 | if (parent) { |
dbd561d2 MS |
993 | nodeid = get_fuse_inode(parent)->nodeid; |
994 | generation = parent->i_generation; | |
dbd561d2 MS |
995 | |
996 | fh[3] = (u32)(nodeid >> 32); | |
997 | fh[4] = (u32)(nodeid & 0xffffffff); | |
998 | fh[5] = generation; | |
999 | } | |
1000 | ||
1001 | *max_len = len; | |
41d1ddd2 | 1002 | return parent ? FILEID_INO64_GEN_PARENT : FILEID_INO64_GEN; |
dbd561d2 MS |
1003 | } |
1004 | ||
1005 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
1006 | struct fid *fid, int fh_len, int fh_type) | |
1007 | { | |
1008 | struct fuse_inode_handle handle; | |
1009 | ||
41d1ddd2 AG |
1010 | if ((fh_type != FILEID_INO64_GEN && |
1011 | fh_type != FILEID_INO64_GEN_PARENT) || fh_len < 3) | |
dbd561d2 MS |
1012 | return NULL; |
1013 | ||
1014 | handle.nodeid = (u64) fid->raw[0] << 32; | |
1015 | handle.nodeid |= (u64) fid->raw[1]; | |
1016 | handle.generation = fid->raw[2]; | |
1017 | return fuse_get_dentry(sb, &handle); | |
1018 | } | |
1019 | ||
1020 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
1021 | struct fid *fid, int fh_len, int fh_type) | |
1022 | { | |
1023 | struct fuse_inode_handle parent; | |
1024 | ||
41d1ddd2 | 1025 | if (fh_type != FILEID_INO64_GEN_PARENT || fh_len < 6) |
dbd561d2 MS |
1026 | return NULL; |
1027 | ||
1028 | parent.nodeid = (u64) fid->raw[3] << 32; | |
1029 | parent.nodeid |= (u64) fid->raw[4]; | |
1030 | parent.generation = fid->raw[5]; | |
1031 | return fuse_get_dentry(sb, &parent); | |
1032 | } | |
1033 | ||
33670fa2 MS |
1034 | static struct dentry *fuse_get_parent(struct dentry *child) |
1035 | { | |
2b0143b5 | 1036 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
1037 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
1038 | struct inode *inode; | |
1039 | struct dentry *parent; | |
1040 | struct fuse_entry_out outarg; | |
33670fa2 MS |
1041 | int err; |
1042 | ||
1043 | if (!fc->export_support) | |
1044 | return ERR_PTR(-ESTALE); | |
1045 | ||
33670fa2 | 1046 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
80e5d1ff | 1047 | &dotdot_name, &outarg, &inode); |
44003728 CH |
1048 | if (err) { |
1049 | if (err == -ENOENT) | |
1050 | return ERR_PTR(-ESTALE); | |
33670fa2 | 1051 | return ERR_PTR(err); |
33670fa2 | 1052 | } |
44003728 CH |
1053 | |
1054 | parent = d_obtain_alias(inode); | |
c35eebe9 | 1055 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 1056 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
1057 | |
1058 | return parent; | |
1059 | } | |
dbd561d2 MS |
1060 | |
1061 | static const struct export_operations fuse_export_operations = { | |
1062 | .fh_to_dentry = fuse_fh_to_dentry, | |
1063 | .fh_to_parent = fuse_fh_to_parent, | |
1064 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 1065 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
1066 | }; |
1067 | ||
ee9b6d61 | 1068 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 1069 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 1070 | .free_inode = fuse_free_inode, |
b57922d9 | 1071 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 1072 | .write_inode = fuse_write_inode, |
ead5f0b5 | 1073 | .drop_inode = generic_delete_inode, |
69a53bf2 | 1074 | .umount_begin = fuse_umount_begin, |
e5e5558e | 1075 | .statfs = fuse_statfs, |
2d82ab25 | 1076 | .sync_fs = fuse_sync_fs, |
d8a5ba45 MS |
1077 | .show_options = fuse_show_options, |
1078 | }; | |
1079 | ||
487ea5af CH |
1080 | static void sanitize_global_limit(unsigned *limit) |
1081 | { | |
f22f812d MS |
1082 | /* |
1083 | * The default maximum number of async requests is calculated to consume | |
1084 | * 1/2^13 of the total memory, assuming 392 bytes per request. | |
1085 | */ | |
487ea5af | 1086 | if (*limit == 0) |
f22f812d | 1087 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392; |
487ea5af CH |
1088 | |
1089 | if (*limit >= 1 << 16) | |
1090 | *limit = (1 << 16) - 1; | |
1091 | } | |
1092 | ||
e4dca7b7 | 1093 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
1094 | { |
1095 | int rv; | |
1096 | ||
1097 | rv = param_set_uint(val, kp); | |
1098 | if (rv) | |
1099 | return rv; | |
1100 | ||
1101 | sanitize_global_limit((unsigned *)kp->arg); | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
1107 | { | |
1108 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
1109 | ||
1110 | if (arg->minor < 13) | |
1111 | return; | |
1112 | ||
1113 | sanitize_global_limit(&max_user_bgreq); | |
1114 | sanitize_global_limit(&max_user_congthresh); | |
1115 | ||
ae2dffa3 | 1116 | spin_lock(&fc->bg_lock); |
487ea5af CH |
1117 | if (arg->max_background) { |
1118 | fc->max_background = arg->max_background; | |
1119 | ||
1120 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
1121 | fc->max_background = max_user_bgreq; | |
1122 | } | |
1123 | if (arg->congestion_threshold) { | |
1124 | fc->congestion_threshold = arg->congestion_threshold; | |
1125 | ||
1126 | if (!cap_sys_admin && | |
1127 | fc->congestion_threshold > max_user_congthresh) | |
1128 | fc->congestion_threshold = max_user_congthresh; | |
1129 | } | |
ae2dffa3 | 1130 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
1131 | } |
1132 | ||
615047ef MS |
1133 | struct fuse_init_args { |
1134 | struct fuse_args args; | |
1135 | struct fuse_init_in in; | |
1136 | struct fuse_init_out out; | |
1137 | }; | |
1138 | ||
fcee216b | 1139 | static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args, |
615047ef | 1140 | int error) |
9b9a0469 | 1141 | { |
fcee216b | 1142 | struct fuse_conn *fc = fm->fc; |
615047ef MS |
1143 | struct fuse_init_args *ia = container_of(args, typeof(*ia), args); |
1144 | struct fuse_init_out *arg = &ia->out; | |
fd1a1dc6 | 1145 | bool ok = true; |
9b9a0469 | 1146 | |
615047ef | 1147 | if (error || arg->major != FUSE_KERNEL_VERSION) |
fd1a1dc6 | 1148 | ok = false; |
9b9a0469 | 1149 | else { |
9cd68455 MS |
1150 | unsigned long ra_pages; |
1151 | ||
487ea5af CH |
1152 | process_init_limits(fc, arg); |
1153 | ||
9cd68455 | 1154 | if (arg->minor >= 6) { |
3066ff93 BS |
1155 | u64 flags = arg->flags; |
1156 | ||
1157 | if (flags & FUSE_INIT_EXT) | |
1158 | flags |= (u64) arg->flags2 << 32; | |
53db2893 | 1159 | |
09cbfeaf | 1160 | ra_pages = arg->max_readahead / PAGE_SIZE; |
53db2893 | 1161 | if (flags & FUSE_ASYNC_READ) |
9cd68455 | 1162 | fc->async_read = 1; |
53db2893 | 1163 | if (!(flags & FUSE_POSIX_LOCKS)) |
71421259 | 1164 | fc->no_lock = 1; |
37fb3a30 | 1165 | if (arg->minor >= 17) { |
53db2893 | 1166 | if (!(flags & FUSE_FLOCK_LOCKS)) |
37fb3a30 | 1167 | fc->no_flock = 1; |
24114504 | 1168 | } else { |
53db2893 | 1169 | if (!(flags & FUSE_POSIX_LOCKS)) |
24114504 | 1170 | fc->no_flock = 1; |
37fb3a30 | 1171 | } |
53db2893 | 1172 | if (flags & FUSE_ATOMIC_O_TRUNC) |
6ff958ed | 1173 | fc->atomic_o_trunc = 1; |
33670fa2 MS |
1174 | if (arg->minor >= 9) { |
1175 | /* LOOKUP has dependency on proto version */ | |
53db2893 | 1176 | if (flags & FUSE_EXPORT_SUPPORT) |
33670fa2 MS |
1177 | fc->export_support = 1; |
1178 | } | |
53db2893 | 1179 | if (flags & FUSE_BIG_WRITES) |
78bb6cb9 | 1180 | fc->big_writes = 1; |
53db2893 | 1181 | if (flags & FUSE_DONT_MASK) |
e0a43ddc | 1182 | fc->dont_mask = 1; |
53db2893 | 1183 | if (flags & FUSE_AUTO_INVAL_DATA) |
72d0d248 | 1184 | fc->auto_inval_data = 1; |
53db2893 | 1185 | else if (flags & FUSE_EXPLICIT_INVAL_DATA) |
ad2ba64d | 1186 | fc->explicit_inval_data = 1; |
53db2893 | 1187 | if (flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 1188 | fc->do_readdirplus = 1; |
53db2893 | 1189 | if (flags & FUSE_READDIRPLUS_AUTO) |
28420dad MS |
1190 | fc->readdirplus_auto = 1; |
1191 | } | |
53db2893 | 1192 | if (flags & FUSE_ASYNC_DIO) |
60b9df7a | 1193 | fc->async_dio = 1; |
53db2893 | 1194 | if (flags & FUSE_WRITEBACK_CACHE) |
4d99ff8f | 1195 | fc->writeback_cache = 1; |
53db2893 | 1196 | if (flags & FUSE_PARALLEL_DIROPS) |
5c672ab3 | 1197 | fc->parallel_dirops = 1; |
53db2893 | 1198 | if (flags & FUSE_HANDLE_KILLPRIV) |
5e940c1d | 1199 | fc->handle_killpriv = 1; |
e27c9d38 | 1200 | if (arg->time_gran && arg->time_gran <= 1000000000) |
fcee216b | 1201 | fm->sb->s_time_gran = arg->time_gran; |
53db2893 | 1202 | if ((flags & FUSE_POSIX_ACL)) { |
29433a29 | 1203 | fc->default_permissions = 1; |
60bcc88a | 1204 | fc->posix_acl = 1; |
60bcc88a | 1205 | } |
53db2893 | 1206 | if (flags & FUSE_CACHE_SYMLINKS) |
5571f1e6 | 1207 | fc->cache_symlinks = 1; |
53db2893 | 1208 | if (flags & FUSE_ABORT_ERROR) |
3b7008b2 | 1209 | fc->abort_err = 1; |
53db2893 | 1210 | if (flags & FUSE_MAX_PAGES) { |
5da784cc | 1211 | fc->max_pages = |
a7f0d7aa | 1212 | min_t(unsigned int, fc->max_pages_limit, |
5da784cc CS |
1213 | max_t(unsigned int, arg->max_pages, 1)); |
1214 | } | |
2ee019fa JX |
1215 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
1216 | if (flags & FUSE_MAP_ALIGNMENT && | |
1217 | !fuse_dax_check_alignment(fc, arg->map_alignment)) { | |
1218 | ok = false; | |
1219 | } | |
1220 | if (flags & FUSE_HAS_INODE_DAX) | |
1221 | fc->inode_dax = 1; | |
fd1a1dc6 | 1222 | } |
53db2893 | 1223 | if (flags & FUSE_HANDLE_KILLPRIV_V2) { |
63f9909f | 1224 | fc->handle_killpriv_v2 = 1; |
9d769e6a VG |
1225 | fm->sb->s_flags |= SB_NOSEC; |
1226 | } | |
53db2893 | 1227 | if (flags & FUSE_SETXATTR_EXT) |
52a4c95f | 1228 | fc->setxattr_ext = 1; |
3e2b6fdb VG |
1229 | if (flags & FUSE_SECURITY_CTX) |
1230 | fc->init_security = 1; | |
8ed7cb3f MS |
1231 | if (flags & FUSE_CREATE_SUPP_GROUP) |
1232 | fc->create_supp_group = 1; | |
e78662e8 HX |
1233 | if (flags & FUSE_DIRECT_IO_RELAX) |
1234 | fc->direct_io_relax = 1; | |
71421259 | 1235 | } else { |
09cbfeaf | 1236 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 1237 | fc->no_lock = 1; |
37fb3a30 | 1238 | fc->no_flock = 1; |
71421259 | 1239 | } |
9cd68455 | 1240 | |
fcee216b MR |
1241 | fm->sb->s_bdi->ra_pages = |
1242 | min(fm->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
1243 | fc->minor = arg->minor; |
1244 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 1245 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 1246 | fc->conn_init = 1; |
9b9a0469 | 1247 | } |
615047ef MS |
1248 | kfree(ia); |
1249 | ||
fd1a1dc6 SH |
1250 | if (!ok) { |
1251 | fc->conn_init = 0; | |
1252 | fc->conn_error = 1; | |
1253 | } | |
1254 | ||
9759bd51 | 1255 | fuse_set_initialized(fc); |
08a53cdc | 1256 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
1257 | } |
1258 | ||
fcee216b | 1259 | void fuse_send_init(struct fuse_mount *fm) |
9b9a0469 | 1260 | { |
615047ef | 1261 | struct fuse_init_args *ia; |
53db2893 | 1262 | u64 flags; |
095da6cb | 1263 | |
615047ef MS |
1264 | ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL); |
1265 | ||
1266 | ia->in.major = FUSE_KERNEL_VERSION; | |
1267 | ia->in.minor = FUSE_KERNEL_MINOR_VERSION; | |
fcee216b | 1268 | ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE; |
53db2893 | 1269 | flags = |
615047ef | 1270 | FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 1271 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 1272 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 1273 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 1274 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 1275 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 1276 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 1277 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
63f9909f | 1278 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA | |
3e2b6fdb | 1279 | FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT | |
5cadfbd5 | 1280 | FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP | |
e78662e8 | 1281 | FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_RELAX; |
fd1a1dc6 | 1282 | #ifdef CONFIG_FUSE_DAX |
fcee216b | 1283 | if (fm->fc->dax) |
53db2893 | 1284 | flags |= FUSE_MAP_ALIGNMENT; |
2ee019fa JX |
1285 | if (fuse_is_inode_dax_mode(fm->fc->dax_mode)) |
1286 | flags |= FUSE_HAS_INODE_DAX; | |
fd1a1dc6 | 1287 | #endif |
bf109c64 | 1288 | if (fm->fc->auto_submounts) |
53db2893 MS |
1289 | flags |= FUSE_SUBMOUNTS; |
1290 | ||
1291 | ia->in.flags = flags; | |
1292 | ia->in.flags2 = flags >> 32; | |
bf109c64 | 1293 | |
615047ef MS |
1294 | ia->args.opcode = FUSE_INIT; |
1295 | ia->args.in_numargs = 1; | |
1296 | ia->args.in_args[0].size = sizeof(ia->in); | |
1297 | ia->args.in_args[0].value = &ia->in; | |
1298 | ia->args.out_numargs = 1; | |
3ad2f3fb | 1299 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
1300 | with interface version < 7.5. Rest of init_out is zeroed |
1301 | by do_get_request(), so a short reply is not a problem */ | |
cabdb4fa | 1302 | ia->args.out_argvar = true; |
615047ef MS |
1303 | ia->args.out_args[0].size = sizeof(ia->out); |
1304 | ia->args.out_args[0].value = &ia->out; | |
1305 | ia->args.force = true; | |
1306 | ia->args.nocreds = true; | |
1307 | ia->args.end = process_init_reply; | |
1308 | ||
fcee216b MR |
1309 | if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0) |
1310 | process_init_reply(fm, &ia->args, -ENOTCONN); | |
9b9a0469 | 1311 | } |
95a84cdb | 1312 | EXPORT_SYMBOL_GPL(fuse_send_init); |
9b9a0469 | 1313 | |
783863d6 | 1314 | void fuse_free_conn(struct fuse_conn *fc) |
43901aab | 1315 | { |
cc080e9e | 1316 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 1317 | kfree_rcu(fc, rcu); |
43901aab | 1318 | } |
783863d6 | 1319 | EXPORT_SYMBOL_GPL(fuse_free_conn); |
43901aab | 1320 | |
a325f9b9 TH |
1321 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1322 | { | |
1323 | int err; | |
5f7f7543 | 1324 | char *suffix = ""; |
a325f9b9 | 1325 | |
69c8ebf8 | 1326 | if (sb->s_bdev) { |
5f7f7543 | 1327 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1328 | /* |
1329 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1330 | * it to our private bdi... | |
1331 | */ | |
1332 | bdi_put(sb->s_bdi); | |
1333 | sb->s_bdi = &noop_backing_dev_info; | |
1334 | } | |
5f7f7543 JK |
1335 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1336 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1337 | if (err) |
1338 | return err; | |
1339 | ||
5f7f7543 | 1340 | /* fuse does it's own writeback accounting */ |
823423ef CH |
1341 | sb->s_bdi->capabilities &= ~BDI_CAP_WRITEBACK_ACCT; |
1342 | sb->s_bdi->capabilities |= BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1343 | |
a325f9b9 TH |
1344 | /* |
1345 | * For a single fuse filesystem use max 1% of dirty + | |
1346 | * writeback threshold. | |
1347 | * | |
1348 | * This gives about 1M of write buffer for memory maps on a | |
1349 | * machine with 1G and 10% dirty_ratio, which should be more | |
1350 | * than enough. | |
1351 | * | |
1352 | * Privileged users can raise it by writing to | |
1353 | * | |
1354 | * /sys/class/bdi/<bdi>/max_ratio | |
1355 | */ | |
5f7f7543 | 1356 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1357 | |
1358 | return 0; | |
1359 | } | |
1360 | ||
0cd1eb9a | 1361 | struct fuse_dev *fuse_dev_alloc(void) |
cc080e9e MS |
1362 | { |
1363 | struct fuse_dev *fud; | |
be2ff42c | 1364 | struct list_head *pq; |
cc080e9e MS |
1365 | |
1366 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1367 | if (!fud) |
1368 | return NULL; | |
cc080e9e | 1369 | |
be2ff42c KT |
1370 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1371 | if (!pq) { | |
1372 | kfree(fud); | |
1373 | return NULL; | |
cc080e9e MS |
1374 | } |
1375 | ||
be2ff42c | 1376 | fud->pq.processing = pq; |
be2ff42c KT |
1377 | fuse_pqueue_init(&fud->pq); |
1378 | ||
0cd1eb9a VG |
1379 | return fud; |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1382 | ||
1383 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc) | |
1384 | { | |
1385 | fud->fc = fuse_conn_get(fc); | |
be2ff42c KT |
1386 | spin_lock(&fc->lock); |
1387 | list_add_tail(&fud->entry, &fc->devices); | |
1388 | spin_unlock(&fc->lock); | |
0cd1eb9a VG |
1389 | } |
1390 | EXPORT_SYMBOL_GPL(fuse_dev_install); | |
be2ff42c | 1391 | |
0cd1eb9a VG |
1392 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc) |
1393 | { | |
1394 | struct fuse_dev *fud; | |
1395 | ||
1396 | fud = fuse_dev_alloc(); | |
1397 | if (!fud) | |
1398 | return NULL; | |
1399 | ||
1400 | fuse_dev_install(fud, fc); | |
cc080e9e MS |
1401 | return fud; |
1402 | } | |
0cd1eb9a | 1403 | EXPORT_SYMBOL_GPL(fuse_dev_alloc_install); |
cc080e9e MS |
1404 | |
1405 | void fuse_dev_free(struct fuse_dev *fud) | |
1406 | { | |
1407 | struct fuse_conn *fc = fud->fc; | |
1408 | ||
1409 | if (fc) { | |
1410 | spin_lock(&fc->lock); | |
1411 | list_del(&fud->entry); | |
1412 | spin_unlock(&fc->lock); | |
1413 | ||
1414 | fuse_conn_put(fc); | |
1415 | } | |
d72f70da | 1416 | kfree(fud->pq.processing); |
cc080e9e MS |
1417 | kfree(fud); |
1418 | } | |
1419 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1420 | ||
1866d779 MR |
1421 | static void fuse_fill_attr_from_inode(struct fuse_attr *attr, |
1422 | const struct fuse_inode *fi) | |
1423 | { | |
3c0d5df2 JL |
1424 | struct timespec64 atime = inode_get_atime(&fi->inode); |
1425 | struct timespec64 mtime = inode_get_mtime(&fi->inode); | |
ceb2d5e9 JL |
1426 | struct timespec64 ctime = inode_get_ctime(&fi->inode); |
1427 | ||
1866d779 MR |
1428 | *attr = (struct fuse_attr){ |
1429 | .ino = fi->inode.i_ino, | |
1430 | .size = fi->inode.i_size, | |
1431 | .blocks = fi->inode.i_blocks, | |
3c0d5df2 JL |
1432 | .atime = atime.tv_sec, |
1433 | .mtime = mtime.tv_sec, | |
ceb2d5e9 | 1434 | .ctime = ctime.tv_sec, |
3c0d5df2 JL |
1435 | .atimensec = atime.tv_nsec, |
1436 | .mtimensec = mtime.tv_nsec, | |
ceb2d5e9 | 1437 | .ctimensec = ctime.tv_nsec, |
1866d779 MR |
1438 | .mode = fi->inode.i_mode, |
1439 | .nlink = fi->inode.i_nlink, | |
1440 | .uid = fi->inode.i_uid.val, | |
1441 | .gid = fi->inode.i_gid.val, | |
1442 | .rdev = fi->inode.i_rdev, | |
1443 | .blksize = 1u << fi->inode.i_blkbits, | |
1444 | }; | |
1445 | } | |
1446 | ||
1447 | static void fuse_sb_defaults(struct super_block *sb) | |
1448 | { | |
1449 | sb->s_magic = FUSE_SUPER_MAGIC; | |
1450 | sb->s_op = &fuse_super_operations; | |
1451 | sb->s_xattr = fuse_xattr_handlers; | |
1452 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1453 | sb->s_time_gran = 1; | |
1454 | sb->s_export_op = &fuse_export_operations; | |
1455 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; | |
1456 | if (sb->s_user_ns != &init_user_ns) | |
1457 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
1458 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); | |
1866d779 MR |
1459 | } |
1460 | ||
1b539917 GK |
1461 | static int fuse_fill_super_submount(struct super_block *sb, |
1462 | struct fuse_inode *parent_fi) | |
1866d779 MR |
1463 | { |
1464 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
1465 | struct super_block *parent_sb = parent_fi->inode.i_sb; | |
1466 | struct fuse_attr root_attr; | |
1467 | struct inode *root; | |
1468 | ||
1469 | fuse_sb_defaults(sb); | |
1470 | fm->sb = sb; | |
1471 | ||
1472 | WARN_ON(sb->s_bdi != &noop_backing_dev_info); | |
1473 | sb->s_bdi = bdi_get(parent_sb->s_bdi); | |
1474 | ||
1475 | sb->s_xattr = parent_sb->s_xattr; | |
1476 | sb->s_time_gran = parent_sb->s_time_gran; | |
1477 | sb->s_blocksize = parent_sb->s_blocksize; | |
1478 | sb->s_blocksize_bits = parent_sb->s_blocksize_bits; | |
1479 | sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL); | |
1480 | if (parent_sb->s_subtype && !sb->s_subtype) | |
1481 | return -ENOMEM; | |
1482 | ||
1483 | fuse_fill_attr_from_inode(&root_attr, parent_fi); | |
1484 | root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0); | |
1485 | /* | |
1486 | * This inode is just a duplicate, so it is not looked up and | |
1487 | * its nlookup should not be incremented. fuse_iget() does | |
1488 | * that, though, so undo it here. | |
1489 | */ | |
1490 | get_fuse_inode(root)->nlookup--; | |
1491 | sb->s_d_op = &fuse_dentry_operations; | |
1492 | sb->s_root = d_make_root(root); | |
1493 | if (!sb->s_root) | |
1494 | return -ENOMEM; | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
266eb3f2 | 1499 | /* Filesystem context private data holds the FUSE inode of the mount point */ |
fe0a7bd8 GK |
1500 | static int fuse_get_tree_submount(struct fs_context *fsc) |
1501 | { | |
266eb3f2 GK |
1502 | struct fuse_mount *fm; |
1503 | struct fuse_inode *mp_fi = fsc->fs_private; | |
1504 | struct fuse_conn *fc = get_fuse_conn(&mp_fi->inode); | |
1505 | struct super_block *sb; | |
1506 | int err; | |
1507 | ||
1508 | fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); | |
1509 | if (!fm) | |
1510 | return -ENOMEM; | |
1511 | ||
c191cd07 | 1512 | fm->fc = fuse_conn_get(fc); |
266eb3f2 GK |
1513 | fsc->s_fs_info = fm; |
1514 | sb = sget_fc(fsc, NULL, set_anon_super_fc); | |
c191cd07 MS |
1515 | if (fsc->s_fs_info) |
1516 | fuse_mount_destroy(fm); | |
1517 | if (IS_ERR(sb)) | |
266eb3f2 | 1518 | return PTR_ERR(sb); |
266eb3f2 GK |
1519 | |
1520 | /* Initialize superblock, making @mp_fi its root */ | |
1521 | err = fuse_fill_super_submount(sb, mp_fi); | |
1522 | if (err) { | |
266eb3f2 GK |
1523 | deactivate_locked_super(sb); |
1524 | return err; | |
1525 | } | |
1526 | ||
1527 | down_write(&fc->killsb); | |
1528 | list_add_tail(&fm->fc_entry, &fc->mounts); | |
1529 | up_write(&fc->killsb); | |
1530 | ||
1531 | sb->s_flags |= SB_ACTIVE; | |
1532 | fsc->root = dget(sb->s_root); | |
1533 | ||
fe0a7bd8 GK |
1534 | return 0; |
1535 | } | |
1536 | ||
1537 | static const struct fs_context_operations fuse_context_submount_ops = { | |
1538 | .get_tree = fuse_get_tree_submount, | |
1539 | }; | |
1540 | ||
1541 | int fuse_init_fs_context_submount(struct fs_context *fsc) | |
1542 | { | |
1543 | fsc->ops = &fuse_context_submount_ops; | |
1544 | return 0; | |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(fuse_init_fs_context_submount); | |
1547 | ||
0cc2656c | 1548 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) |
d8a5ba45 | 1549 | { |
7fd3abfa | 1550 | struct fuse_dev *fud = NULL; |
fcee216b MR |
1551 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1552 | struct fuse_conn *fc = fm->fc; | |
d8a5ba45 | 1553 | struct inode *root; |
f543f253 | 1554 | struct dentry *root_dentry; |
d8a5ba45 MS |
1555 | int err; |
1556 | ||
c2b8f006 | 1557 | err = -EINVAL; |
1751e8a6 | 1558 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1559 | goto err; |
71421259 | 1560 | |
660585b5 | 1561 | rcu_assign_pointer(fc->curr_bucket, fuse_sync_bucket_alloc()); |
1866d779 | 1562 | fuse_sb_defaults(sb); |
9e1f1de0 | 1563 | |
0cc2656c | 1564 | if (ctx->is_bdev) { |
875d95ec | 1565 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1566 | err = -EINVAL; |
c30da2e9 | 1567 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1568 | goto err; |
875d95ec | 1569 | #endif |
d8091614 | 1570 | } else { |
09cbfeaf KS |
1571 | sb->s_blocksize = PAGE_SIZE; |
1572 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1573 | } |
c30da2e9 DH |
1574 | |
1575 | sb->s_subtype = ctx->subtype; | |
1576 | ctx->subtype = NULL; | |
1dd53957 | 1577 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
780b1b95 | 1578 | err = fuse_dax_conn_alloc(fc, ctx->dax_mode, ctx->dax_dev); |
1dd53957 VG |
1579 | if (err) |
1580 | goto err; | |
1581 | } | |
e45b2546 | 1582 | |
7fd3abfa VG |
1583 | if (ctx->fudptr) { |
1584 | err = -ENOMEM; | |
1585 | fud = fuse_dev_alloc_install(fc); | |
1586 | if (!fud) | |
1dd53957 | 1587 | goto err_free_dax; |
7fd3abfa | 1588 | } |
cc080e9e | 1589 | |
a325f9b9 | 1590 | fc->dev = sb->s_dev; |
fcee216b | 1591 | fm->sb = sb; |
a325f9b9 TH |
1592 | err = fuse_bdi_init(fc, sb); |
1593 | if (err) | |
cc080e9e | 1594 | goto err_dev_free; |
0d179aa5 | 1595 | |
e0a43ddc | 1596 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1597 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1598 | fc->dont_mask = 1; |
1751e8a6 | 1599 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1600 | |
c30da2e9 DH |
1601 | fc->default_permissions = ctx->default_permissions; |
1602 | fc->allow_other = ctx->allow_other; | |
1603 | fc->user_id = ctx->user_id; | |
1604 | fc->group_id = ctx->group_id; | |
f4fd4ae3 | 1605 | fc->legacy_opts_show = ctx->legacy_opts_show; |
1866d779 | 1606 | fc->max_read = max_t(unsigned int, 4096, ctx->max_read); |
783863d6 | 1607 | fc->destroy = ctx->destroy; |
15c8e72e VG |
1608 | fc->no_control = ctx->no_control; |
1609 | fc->no_force_umount = ctx->no_force_umount; | |
f543f253 | 1610 | |
d8a5ba45 | 1611 | err = -ENOMEM; |
c30da2e9 | 1612 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1613 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1614 | root_dentry = d_make_root(root); |
1615 | if (!root_dentry) | |
cc080e9e | 1616 | goto err_dev_free; |
0ce267ff | 1617 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1618 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1619 | |
bafa9654 | 1620 | mutex_lock(&fuse_mutex); |
8aa09a50 | 1621 | err = -EINVAL; |
7fd3abfa | 1622 | if (ctx->fudptr && *ctx->fudptr) |
bafa9654 | 1623 | goto err_unlock; |
8aa09a50 | 1624 | |
bafa9654 MS |
1625 | err = fuse_ctl_add_conn(fc); |
1626 | if (err) | |
1627 | goto err_unlock; | |
1628 | ||
1629 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1630 | sb->s_root = root_dentry; |
7fd3abfa VG |
1631 | if (ctx->fudptr) |
1632 | *ctx->fudptr = fud; | |
bafa9654 | 1633 | mutex_unlock(&fuse_mutex); |
0cc2656c SH |
1634 | return 0; |
1635 | ||
1636 | err_unlock: | |
1637 | mutex_unlock(&fuse_mutex); | |
1638 | dput(root_dentry); | |
1639 | err_dev_free: | |
7fd3abfa VG |
1640 | if (fud) |
1641 | fuse_dev_free(fud); | |
1dd53957 VG |
1642 | err_free_dax: |
1643 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
1644 | fuse_dax_conn_free(fc); | |
0cc2656c SH |
1645 | err: |
1646 | return err; | |
1647 | } | |
1648 | EXPORT_SYMBOL_GPL(fuse_fill_super_common); | |
1649 | ||
1650 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) | |
1651 | { | |
1652 | struct fuse_fs_context *ctx = fsc->fs_private; | |
0cc2656c | 1653 | int err; |
0cc2656c | 1654 | |
62dd1fc8 | 1655 | if (!ctx->file || !ctx->rootmode_present || |
badc7414 MS |
1656 | !ctx->user_id_present || !ctx->group_id_present) |
1657 | return -EINVAL; | |
0cc2656c SH |
1658 | |
1659 | /* | |
1660 | * Require mount to happen from the same user namespace which | |
1661 | * opened /dev/fuse to prevent potential attacks. | |
1662 | */ | |
62dd1fc8 MS |
1663 | if ((ctx->file->f_op != &fuse_dev_operations) || |
1664 | (ctx->file->f_cred->user_ns != sb->s_user_ns)) | |
964d32e5 | 1665 | return -EINVAL; |
62dd1fc8 | 1666 | ctx->fudptr = &ctx->file->private_data; |
0cc2656c | 1667 | |
0cc2656c SH |
1668 | err = fuse_fill_super_common(sb, ctx); |
1669 | if (err) | |
964d32e5 | 1670 | return err; |
62dd1fc8 MS |
1671 | /* file->private_data shall be visible on all CPUs after this */ |
1672 | smp_mb(); | |
fcee216b | 1673 | fuse_send_init(get_fuse_mount_super(sb)); |
d8a5ba45 | 1674 | return 0; |
d8a5ba45 MS |
1675 | } |
1676 | ||
5d5b74aa MS |
1677 | /* |
1678 | * This is the path where user supplied an already initialized fuse dev. In | |
1679 | * this case never create a new super if the old one is gone. | |
1680 | */ | |
1681 | static int fuse_set_no_super(struct super_block *sb, struct fs_context *fsc) | |
d8a5ba45 | 1682 | { |
5d5b74aa MS |
1683 | return -ENOTCONN; |
1684 | } | |
c30da2e9 | 1685 | |
5d5b74aa MS |
1686 | static int fuse_test_super(struct super_block *sb, struct fs_context *fsc) |
1687 | { | |
c30da2e9 | 1688 | |
5d5b74aa MS |
1689 | return fsc->sget_key == get_fuse_conn_super(sb); |
1690 | } | |
1691 | ||
84c21507 | 1692 | static int fuse_get_tree(struct fs_context *fsc) |
d8a5ba45 | 1693 | { |
84c21507 | 1694 | struct fuse_fs_context *ctx = fsc->fs_private; |
5d5b74aa | 1695 | struct fuse_dev *fud; |
80019f11 MS |
1696 | struct fuse_conn *fc; |
1697 | struct fuse_mount *fm; | |
5d5b74aa | 1698 | struct super_block *sb; |
62dd1fc8 | 1699 | int err; |
c30da2e9 | 1700 | |
80019f11 MS |
1701 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
1702 | if (!fc) | |
1703 | return -ENOMEM; | |
1704 | ||
1705 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); | |
1706 | if (!fm) { | |
1707 | kfree(fc); | |
1708 | return -ENOMEM; | |
1709 | } | |
1710 | ||
1711 | fuse_conn_init(fc, fm, fsc->user_ns, &fuse_dev_fiq_ops, NULL); | |
1712 | fc->release = fuse_free_conn; | |
1713 | ||
1714 | fsc->s_fs_info = fm; | |
1715 | ||
62dd1fc8 MS |
1716 | if (ctx->fd_present) |
1717 | ctx->file = fget(ctx->fd); | |
c30da2e9 | 1718 | |
badc7414 | 1719 | if (IS_ENABLED(CONFIG_BLOCK) && ctx->is_bdev) { |
62dd1fc8 | 1720 | err = get_tree_bdev(fsc, fuse_fill_super); |
80019f11 | 1721 | goto out; |
badc7414 | 1722 | } |
5d5b74aa MS |
1723 | /* |
1724 | * While block dev mount can be initialized with a dummy device fd | |
1725 | * (found by device name), normal fuse mounts can't | |
1726 | */ | |
80019f11 | 1727 | err = -EINVAL; |
5d5b74aa | 1728 | if (!ctx->file) |
80019f11 | 1729 | goto out; |
c30da2e9 | 1730 | |
5d5b74aa MS |
1731 | /* |
1732 | * Allow creating a fuse mount with an already initialized fuse | |
1733 | * connection | |
1734 | */ | |
1735 | fud = READ_ONCE(ctx->file->private_data); | |
1736 | if (ctx->file->f_op == &fuse_dev_operations && fud) { | |
1737 | fsc->sget_key = fud->fc; | |
1738 | sb = sget_fc(fsc, fuse_test_super, fuse_set_no_super); | |
1739 | err = PTR_ERR_OR_ZERO(sb); | |
1740 | if (!IS_ERR(sb)) | |
1741 | fsc->root = dget(sb->s_root); | |
1742 | } else { | |
1743 | err = get_tree_nodev(fsc, fuse_fill_super); | |
1744 | } | |
80019f11 MS |
1745 | out: |
1746 | if (fsc->s_fs_info) | |
1747 | fuse_mount_destroy(fm); | |
62dd1fc8 MS |
1748 | if (ctx->file) |
1749 | fput(ctx->file); | |
1750 | return err; | |
c30da2e9 DH |
1751 | } |
1752 | ||
1753 | static const struct fs_context_operations fuse_context_ops = { | |
84c21507 | 1754 | .free = fuse_free_fsc, |
c30da2e9 | 1755 | .parse_param = fuse_parse_param, |
0189a2d3 | 1756 | .reconfigure = fuse_reconfigure, |
c30da2e9 DH |
1757 | .get_tree = fuse_get_tree, |
1758 | }; | |
1759 | ||
1760 | /* | |
1761 | * Set up the filesystem mount context. | |
1762 | */ | |
84c21507 | 1763 | static int fuse_init_fs_context(struct fs_context *fsc) |
c30da2e9 DH |
1764 | { |
1765 | struct fuse_fs_context *ctx; | |
1766 | ||
1767 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1768 | if (!ctx) | |
1769 | return -ENOMEM; | |
1770 | ||
1771 | ctx->max_read = ~0; | |
1772 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
f4fd4ae3 | 1773 | ctx->legacy_opts_show = true; |
c30da2e9 DH |
1774 | |
1775 | #ifdef CONFIG_BLOCK | |
84c21507 | 1776 | if (fsc->fs_type == &fuseblk_fs_type) { |
c30da2e9 | 1777 | ctx->is_bdev = true; |
783863d6 MS |
1778 | ctx->destroy = true; |
1779 | } | |
c30da2e9 DH |
1780 | #endif |
1781 | ||
84c21507 MS |
1782 | fsc->fs_private = ctx; |
1783 | fsc->ops = &fuse_context_ops; | |
c30da2e9 | 1784 | return 0; |
d8a5ba45 MS |
1785 | } |
1786 | ||
fcee216b | 1787 | bool fuse_mount_remove(struct fuse_mount *fm) |
3b463ae0 | 1788 | { |
fcee216b MR |
1789 | struct fuse_conn *fc = fm->fc; |
1790 | bool last = false; | |
3b463ae0 | 1791 | |
fcee216b MR |
1792 | down_write(&fc->killsb); |
1793 | list_del_init(&fm->fc_entry); | |
1794 | if (list_empty(&fc->mounts)) | |
1795 | last = true; | |
1796 | up_write(&fc->killsb); | |
e8f3bd77 | 1797 | |
fcee216b MR |
1798 | return last; |
1799 | } | |
1800 | EXPORT_SYMBOL_GPL(fuse_mount_remove); | |
e8f3bd77 | 1801 | |
fcee216b MR |
1802 | void fuse_conn_destroy(struct fuse_mount *fm) |
1803 | { | |
1804 | struct fuse_conn *fc = fm->fc; | |
1805 | ||
1806 | if (fc->destroy) | |
1807 | fuse_send_destroy(fm); | |
1808 | ||
1809 | fuse_abort_conn(fc); | |
1810 | fuse_wait_aborted(fc); | |
413daa1a MS |
1811 | |
1812 | if (!list_empty(&fc->entry)) { | |
1813 | mutex_lock(&fuse_mutex); | |
1814 | list_del(&fc->entry); | |
1815 | fuse_ctl_remove_conn(fc); | |
1816 | mutex_unlock(&fuse_mutex); | |
3b463ae0 | 1817 | } |
e8f3bd77 | 1818 | } |
fcee216b | 1819 | EXPORT_SYMBOL_GPL(fuse_conn_destroy); |
3b463ae0 | 1820 | |
6a68d1e1 | 1821 | static void fuse_sb_destroy(struct super_block *sb) |
e8f3bd77 | 1822 | { |
fcee216b MR |
1823 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1824 | bool last; | |
1825 | ||
d534d31d | 1826 | if (sb->s_root) { |
fcee216b MR |
1827 | last = fuse_mount_remove(fm); |
1828 | if (last) | |
1829 | fuse_conn_destroy(fm); | |
1830 | } | |
6a68d1e1 MS |
1831 | } |
1832 | ||
a27c061a MS |
1833 | void fuse_mount_destroy(struct fuse_mount *fm) |
1834 | { | |
80019f11 MS |
1835 | fuse_conn_put(fm->fc); |
1836 | kfree(fm); | |
a27c061a MS |
1837 | } |
1838 | EXPORT_SYMBOL(fuse_mount_destroy); | |
1839 | ||
6a68d1e1 MS |
1840 | static void fuse_kill_sb_anon(struct super_block *sb) |
1841 | { | |
1842 | fuse_sb_destroy(sb); | |
3b463ae0 | 1843 | kill_anon_super(sb); |
a27c061a | 1844 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1845 | } |
1846 | ||
875d95ec MS |
1847 | static struct file_system_type fuse_fs_type = { |
1848 | .owner = THIS_MODULE, | |
1849 | .name = "fuse", | |
4ad769f3 | 1850 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 | 1851 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1852 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1853 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1854 | }; |
7f78e035 | 1855 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1856 | |
1857 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1858 | static void fuse_kill_sb_blk(struct super_block *sb) |
1859 | { | |
6a68d1e1 | 1860 | fuse_sb_destroy(sb); |
3b463ae0 | 1861 | kill_block_super(sb); |
a27c061a | 1862 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1863 | } |
1864 | ||
d6392f87 MS |
1865 | static struct file_system_type fuseblk_fs_type = { |
1866 | .owner = THIS_MODULE, | |
1867 | .name = "fuseblk", | |
c30da2e9 | 1868 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1869 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1870 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1871 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1872 | }; |
7f78e035 | 1873 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1874 | |
875d95ec MS |
1875 | static inline int register_fuseblk(void) |
1876 | { | |
1877 | return register_filesystem(&fuseblk_fs_type); | |
1878 | } | |
1879 | ||
1880 | static inline void unregister_fuseblk(void) | |
1881 | { | |
1882 | unregister_filesystem(&fuseblk_fs_type); | |
1883 | } | |
1884 | #else | |
1885 | static inline int register_fuseblk(void) | |
1886 | { | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | static inline void unregister_fuseblk(void) | |
1891 | { | |
1892 | } | |
1893 | #endif | |
1894 | ||
51cc5068 | 1895 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1896 | { |
1729a16c | 1897 | struct inode *inode = foo; |
d8a5ba45 | 1898 | |
a35afb83 | 1899 | inode_init_once(inode); |
d8a5ba45 MS |
1900 | } |
1901 | ||
1902 | static int __init fuse_fs_init(void) | |
1903 | { | |
1904 | int err; | |
1905 | ||
d6392f87 | 1906 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1907 | sizeof(struct fuse_inode), 0, |
1908 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1909 | fuse_inode_init_once); | |
d6392f87 MS |
1910 | err = -ENOMEM; |
1911 | if (!fuse_inode_cachep) | |
988f0325 AV |
1912 | goto out; |
1913 | ||
1914 | err = register_fuseblk(); | |
1915 | if (err) | |
1916 | goto out2; | |
1917 | ||
1918 | err = register_filesystem(&fuse_fs_type); | |
1919 | if (err) | |
1920 | goto out3; | |
d6392f87 MS |
1921 | |
1922 | return 0; | |
d8a5ba45 | 1923 | |
988f0325 | 1924 | out3: |
875d95ec | 1925 | unregister_fuseblk(); |
988f0325 AV |
1926 | out2: |
1927 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1928 | out: |
d8a5ba45 MS |
1929 | return err; |
1930 | } | |
1931 | ||
1932 | static void fuse_fs_cleanup(void) | |
1933 | { | |
1934 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1935 | unregister_fuseblk(); |
8c0a8537 KS |
1936 | |
1937 | /* | |
1938 | * Make sure all delayed rcu free inodes are flushed before we | |
1939 | * destroy cache. | |
1940 | */ | |
1941 | rcu_barrier(); | |
d8a5ba45 MS |
1942 | kmem_cache_destroy(fuse_inode_cachep); |
1943 | } | |
1944 | ||
5c89e17e | 1945 | static struct kobject *fuse_kobj; |
5c89e17e | 1946 | |
f543f253 MS |
1947 | static int fuse_sysfs_init(void) |
1948 | { | |
1949 | int err; | |
1950 | ||
00d26666 | 1951 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1952 | if (!fuse_kobj) { |
1953 | err = -ENOMEM; | |
f543f253 | 1954 | goto out_err; |
5c89e17e | 1955 | } |
f543f253 | 1956 | |
f9bb4882 EB |
1957 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1958 | if (err) | |
f543f253 MS |
1959 | goto out_fuse_unregister; |
1960 | ||
1961 | return 0; | |
1962 | ||
1963 | out_fuse_unregister: | |
197b12d6 | 1964 | kobject_put(fuse_kobj); |
f543f253 MS |
1965 | out_err: |
1966 | return err; | |
1967 | } | |
1968 | ||
1969 | static void fuse_sysfs_cleanup(void) | |
1970 | { | |
f9bb4882 | 1971 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1972 | kobject_put(fuse_kobj); |
f543f253 MS |
1973 | } |
1974 | ||
d8a5ba45 MS |
1975 | static int __init fuse_init(void) |
1976 | { | |
1977 | int res; | |
1978 | ||
f2294482 KS |
1979 | pr_info("init (API version %i.%i)\n", |
1980 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1981 | |
bafa9654 | 1982 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1983 | res = fuse_fs_init(); |
1984 | if (res) | |
1985 | goto err; | |
1986 | ||
334f485d MS |
1987 | res = fuse_dev_init(); |
1988 | if (res) | |
1989 | goto err_fs_cleanup; | |
1990 | ||
f543f253 MS |
1991 | res = fuse_sysfs_init(); |
1992 | if (res) | |
1993 | goto err_dev_cleanup; | |
1994 | ||
bafa9654 MS |
1995 | res = fuse_ctl_init(); |
1996 | if (res) | |
1997 | goto err_sysfs_cleanup; | |
1998 | ||
487ea5af CH |
1999 | sanitize_global_limit(&max_user_bgreq); |
2000 | sanitize_global_limit(&max_user_congthresh); | |
2001 | ||
d8a5ba45 MS |
2002 | return 0; |
2003 | ||
bafa9654 MS |
2004 | err_sysfs_cleanup: |
2005 | fuse_sysfs_cleanup(); | |
f543f253 MS |
2006 | err_dev_cleanup: |
2007 | fuse_dev_cleanup(); | |
334f485d MS |
2008 | err_fs_cleanup: |
2009 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
2010 | err: |
2011 | return res; | |
2012 | } | |
2013 | ||
2014 | static void __exit fuse_exit(void) | |
2015 | { | |
f2294482 | 2016 | pr_debug("exit\n"); |
d8a5ba45 | 2017 | |
bafa9654 | 2018 | fuse_ctl_cleanup(); |
f543f253 | 2019 | fuse_sysfs_cleanup(); |
d8a5ba45 | 2020 | fuse_fs_cleanup(); |
334f485d | 2021 | fuse_dev_cleanup(); |
d8a5ba45 MS |
2022 | } |
2023 | ||
2024 | module_init(fuse_init); | |
2025 | module_exit(fuse_exit); |