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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; |
2f1e8196 | 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, |
4b52f059 | 166 | u64 attr_valid, u32 cache_mask) |
d8a5ba45 | 167 | { |
9ffbb916 | 168 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 169 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 170 | |
f15ecfef KT |
171 | lockdep_assert_held(&fi->lock); |
172 | ||
4510d86f | 173 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
1fb69e78 | 174 | fi->i_time = attr_valid; |
2f1e8196 | 175 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 176 | |
45c72cd7 | 177 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 178 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 179 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
180 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
181 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 | 182 | inode->i_blocks = attr->blocks; |
47912eaa MS |
183 | |
184 | /* Sanitize nsecs */ | |
185 | attr->atimensec = min_t(u32, attr->atimensec, NSEC_PER_SEC - 1); | |
186 | attr->mtimensec = min_t(u32, attr->mtimensec, NSEC_PER_SEC - 1); | |
187 | attr->ctimensec = min_t(u32, attr->ctimensec, NSEC_PER_SEC - 1); | |
188 | ||
d8a5ba45 MS |
189 | inode->i_atime.tv_sec = attr->atime; |
190 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 | 191 | /* mtime from server may be stale due to local buffered write */ |
4b52f059 | 192 | if (!(cache_mask & STATX_MTIME)) { |
b0aa7606 MP |
193 | inode->i_mtime.tv_sec = attr->mtime; |
194 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
4b52f059 MS |
195 | } |
196 | if (!(cache_mask & STATX_CTIME)) { | |
31f3267b MP |
197 | inode->i_ctime.tv_sec = attr->ctime; |
198 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 199 | } |
e00d2c2d | 200 | |
0e9663ee MS |
201 | if (attr->blksize != 0) |
202 | inode->i_blkbits = ilog2(attr->blksize); | |
203 | else | |
204 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
205 | ||
ebc14c4d MS |
206 | /* |
207 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
208 | * to check permissions. This prevents failures due to the | |
209 | * check in may_delete(). | |
210 | */ | |
211 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 212 | if (!fc->default_permissions) |
ebc14c4d | 213 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
214 | |
215 | fi->orig_ino = attr->ino; | |
9d769e6a VG |
216 | |
217 | /* | |
218 | * We are refreshing inode data and it is possible that another | |
219 | * client set suid/sgid or security.capability xattr. So clear | |
220 | * S_NOSEC. Ideally, we could have cleared it only if suid/sgid | |
221 | * was set or if security.capability xattr was set. But we don't | |
222 | * know if security.capability has been set or not. So clear it | |
223 | * anyway. Its less efficient but should be safe. | |
224 | */ | |
225 | inode->i_flags &= ~S_NOSEC; | |
3be5a52b MS |
226 | } |
227 | ||
4b52f059 MS |
228 | u32 fuse_get_cache_mask(struct inode *inode) |
229 | { | |
230 | struct fuse_conn *fc = get_fuse_conn(inode); | |
231 | ||
232 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) | |
233 | return 0; | |
234 | ||
235 | return STATX_MTIME | STATX_CTIME | STATX_SIZE; | |
236 | } | |
237 | ||
3be5a52b MS |
238 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
239 | u64 attr_valid, u64 attr_version) | |
240 | { | |
241 | struct fuse_conn *fc = get_fuse_conn(inode); | |
242 | struct fuse_inode *fi = get_fuse_inode(inode); | |
4b52f059 | 243 | u32 cache_mask; |
3be5a52b | 244 | loff_t oldsize; |
a64ba10f | 245 | struct timespec64 old_mtime; |
3be5a52b | 246 | |
f15ecfef | 247 | spin_lock(&fi->lock); |
04d82db0 MS |
248 | /* |
249 | * In case of writeback_cache enabled, writes update mtime, ctime and | |
250 | * may update i_size. In these cases trust the cached value in the | |
251 | * inode. | |
252 | */ | |
4b52f059 MS |
253 | cache_mask = fuse_get_cache_mask(inode); |
254 | if (cache_mask & STATX_SIZE) | |
04d82db0 | 255 | attr->size = i_size_read(inode); |
4b52f059 MS |
256 | |
257 | if (cache_mask & STATX_MTIME) { | |
04d82db0 MS |
258 | attr->mtime = inode->i_mtime.tv_sec; |
259 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
4b52f059 MS |
260 | } |
261 | if (cache_mask & STATX_CTIME) { | |
04d82db0 MS |
262 | attr->ctime = inode->i_ctime.tv_sec; |
263 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
264 | } | |
265 | ||
06a7c3c2 MP |
266 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
267 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 268 | spin_unlock(&fi->lock); |
3be5a52b MS |
269 | return; |
270 | } | |
271 | ||
a64ba10f | 272 | old_mtime = inode->i_mtime; |
4b52f059 | 273 | fuse_change_attributes_common(inode, attr, attr_valid, cache_mask); |
ebc14c4d | 274 | |
e00d2c2d | 275 | oldsize = inode->i_size; |
8373200b PE |
276 | /* |
277 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
278 | * extend local i_size without keeping userspace server in sync. So, | |
279 | * attr->size coming from server can be stale. We cannot trust it. | |
280 | */ | |
4b52f059 | 281 | if (!(cache_mask & STATX_SIZE)) |
8373200b | 282 | i_size_write(inode, attr->size); |
f15ecfef | 283 | spin_unlock(&fi->lock); |
e00d2c2d | 284 | |
4b52f059 | 285 | if (!cache_mask && S_ISREG(inode->i_mode)) { |
eed2179e BF |
286 | bool inval = false; |
287 | ||
288 | if (oldsize != attr->size) { | |
7caef267 | 289 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
290 | if (!fc->explicit_inval_data) |
291 | inval = true; | |
eed2179e | 292 | } else if (fc->auto_inval_data) { |
a64ba10f | 293 | struct timespec64 new_mtime = { |
eed2179e BF |
294 | .tv_sec = attr->mtime, |
295 | .tv_nsec = attr->mtimensec, | |
296 | }; | |
297 | ||
298 | /* | |
299 | * Auto inval mode also checks and invalidates if mtime | |
300 | * has changed. | |
301 | */ | |
a64ba10f | 302 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
303 | inval = true; |
304 | } | |
305 | ||
306 | if (inval) | |
307 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 308 | } |
c3cb6f93 JX |
309 | |
310 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
311 | fuse_dax_dontcache(inode, attr->flags); | |
d8a5ba45 MS |
312 | } |
313 | ||
facd6105 CB |
314 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr, |
315 | struct fuse_conn *fc) | |
d8a5ba45 MS |
316 | { |
317 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 318 | inode->i_size = attr->size; |
b0aa7606 MP |
319 | inode->i_mtime.tv_sec = attr->mtime; |
320 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
321 | inode->i_ctime.tv_sec = attr->ctime; |
322 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
323 | if (S_ISREG(inode->i_mode)) { |
324 | fuse_init_common(inode); | |
93a497b9 | 325 | fuse_init_file_inode(inode, attr->flags); |
e5e5558e MS |
326 | } else if (S_ISDIR(inode->i_mode)) |
327 | fuse_init_dir(inode); | |
328 | else if (S_ISLNK(inode->i_mode)) | |
329 | fuse_init_symlink(inode); | |
330 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
331 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
332 | fuse_init_common(inode); | |
333 | init_special_inode(inode, inode->i_mode, | |
334 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
335 | } else |
336 | BUG(); | |
facd6105 CB |
337 | /* |
338 | * Ensure that we don't cache acls for daemons without FUSE_POSIX_ACL | |
339 | * so they see the exact same behavior as before. | |
340 | */ | |
341 | if (!fc->posix_acl) | |
342 | inode->i_acl = inode->i_default_acl = ACL_DONT_CACHE; | |
d8a5ba45 MS |
343 | } |
344 | ||
fcee216b | 345 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 346 | { |
b48badf0 | 347 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
348 | if (get_node_id(inode) == nodeid) |
349 | return 1; | |
350 | else | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
355 | { | |
b48badf0 | 356 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
357 | get_fuse_inode(inode)->nodeid = nodeid; |
358 | return 0; | |
359 | } | |
360 | ||
b48badf0 | 361 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
362 | int generation, struct fuse_attr *attr, |
363 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
364 | { |
365 | struct inode *inode; | |
9e6268db | 366 | struct fuse_inode *fi; |
d8a5ba45 | 367 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 | 368 | |
bf109c64 MR |
369 | /* |
370 | * Auto mount points get their node id from the submount root, which is | |
371 | * not a unique identifier within this filesystem. | |
372 | * | |
373 | * To avoid conflicts, do not place submount points into the inode hash | |
374 | * table. | |
375 | */ | |
376 | if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) && | |
377 | S_ISDIR(attr->mode)) { | |
378 | inode = new_inode(sb); | |
379 | if (!inode) | |
380 | return NULL; | |
381 | ||
facd6105 | 382 | fuse_init_inode(inode, attr, fc); |
bf109c64 MR |
383 | get_fuse_inode(inode)->nodeid = nodeid; |
384 | inode->i_flags |= S_AUTOMOUNT; | |
385 | goto done; | |
386 | } | |
387 | ||
388 | retry: | |
d8a5ba45 MS |
389 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
390 | if (!inode) | |
391 | return NULL; | |
392 | ||
393 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 394 | inode->i_flags |= S_NOATIME; |
d31433c8 | 395 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 396 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 397 | inode->i_generation = generation; |
facd6105 | 398 | fuse_init_inode(inode, attr, fc); |
d8a5ba45 | 399 | unlock_new_inode(inode); |
15db1683 AG |
400 | } else if (fuse_stale_inode(inode, generation, attr)) { |
401 | /* nodeid was reused, any I/O on the old inode should fail */ | |
5d069dbe | 402 | fuse_make_bad(inode); |
d8a5ba45 | 403 | iput(inode); |
d8a5ba45 MS |
404 | goto retry; |
405 | } | |
bf109c64 | 406 | done: |
9e6268db | 407 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 408 | spin_lock(&fi->lock); |
1729a16c | 409 | fi->nlookup++; |
c9d8f5f0 | 410 | spin_unlock(&fi->lock); |
1fb69e78 MS |
411 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
412 | ||
d8a5ba45 MS |
413 | return inode; |
414 | } | |
415 | ||
fcee216b MR |
416 | struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid, |
417 | struct fuse_mount **fm) | |
418 | { | |
419 | struct fuse_mount *fm_iter; | |
420 | struct inode *inode; | |
421 | ||
422 | WARN_ON(!rwsem_is_locked(&fc->killsb)); | |
423 | list_for_each_entry(fm_iter, &fc->mounts, fc_entry) { | |
424 | if (!fm_iter->sb) | |
425 | continue; | |
426 | ||
427 | inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid); | |
428 | if (inode) { | |
429 | if (fm) | |
430 | *fm = fm_iter; | |
431 | return inode; | |
432 | } | |
433 | } | |
434 | ||
435 | return NULL; | |
436 | } | |
437 | ||
438 | int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid, | |
3b463ae0 JM |
439 | loff_t offset, loff_t len) |
440 | { | |
5ddd9ced | 441 | struct fuse_inode *fi; |
3b463ae0 JM |
442 | struct inode *inode; |
443 | pgoff_t pg_start; | |
444 | pgoff_t pg_end; | |
445 | ||
fcee216b | 446 | inode = fuse_ilookup(fc, nodeid, NULL); |
3b463ae0 JM |
447 | if (!inode) |
448 | return -ENOENT; | |
449 | ||
5ddd9ced MS |
450 | fi = get_fuse_inode(inode); |
451 | spin_lock(&fi->lock); | |
452 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
453 | spin_unlock(&fi->lock); | |
454 | ||
3b463ae0 | 455 | fuse_invalidate_attr(inode); |
60bcc88a | 456 | forget_all_cached_acls(inode); |
3b463ae0 | 457 | if (offset >= 0) { |
09cbfeaf | 458 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
459 | if (len <= 0) |
460 | pg_end = -1; | |
461 | else | |
09cbfeaf | 462 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
463 | invalidate_inode_pages2_range(inode->i_mapping, |
464 | pg_start, pg_end); | |
465 | } | |
466 | iput(inode); | |
467 | return 0; | |
468 | } | |
469 | ||
63576c13 | 470 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 471 | { |
63576c13 MS |
472 | bool locked = false; |
473 | ||
474 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 475 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
476 | locked = true; |
477 | } | |
478 | ||
479 | return locked; | |
5c672ab3 MS |
480 | } |
481 | ||
63576c13 | 482 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 483 | { |
63576c13 | 484 | if (locked) |
5c672ab3 MS |
485 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
486 | } | |
487 | ||
42faad99 | 488 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 489 | { |
15c8e72e VG |
490 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
491 | ||
247861c3 DL |
492 | if (fc->no_force_umount) |
493 | return; | |
494 | ||
495 | fuse_abort_conn(fc); | |
496 | ||
497 | // Only retire block-device-based superblocks. | |
498 | if (sb->s_bdev != NULL) | |
499 | retire_super(sb); | |
69a53bf2 MS |
500 | } |
501 | ||
fcee216b | 502 | static void fuse_send_destroy(struct fuse_mount *fm) |
0ec7ca41 | 503 | { |
fcee216b | 504 | if (fm->fc->conn_init) { |
1ccd1ea2 MS |
505 | FUSE_ARGS(args); |
506 | ||
507 | args.opcode = FUSE_DESTROY; | |
508 | args.force = true; | |
509 | args.nocreds = true; | |
fcee216b | 510 | fuse_simple_request(fm, &args); |
0ec7ca41 MS |
511 | } |
512 | } | |
513 | ||
e5e5558e MS |
514 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
515 | { | |
516 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
517 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 518 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
519 | stbuf->f_blocks = attr->blocks; |
520 | stbuf->f_bfree = attr->bfree; | |
521 | stbuf->f_bavail = attr->bavail; | |
522 | stbuf->f_files = attr->files; | |
523 | stbuf->f_ffree = attr->ffree; | |
524 | stbuf->f_namelen = attr->namelen; | |
525 | /* fsid is left zero */ | |
526 | } | |
527 | ||
726c3342 | 528 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 529 | { |
726c3342 | 530 | struct super_block *sb = dentry->d_sb; |
fcee216b | 531 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 532 | FUSE_ARGS(args); |
e5e5558e MS |
533 | struct fuse_statfs_out outarg; |
534 | int err; | |
535 | ||
fcee216b | 536 | if (!fuse_allow_current_process(fm->fc)) { |
e57ac683 MS |
537 | buf->f_type = FUSE_SUPER_MAGIC; |
538 | return 0; | |
539 | } | |
540 | ||
de5f1202 | 541 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
542 | args.in_numargs = 0; |
543 | args.opcode = FUSE_STATFS; | |
544 | args.nodeid = get_node_id(d_inode(dentry)); | |
545 | args.out_numargs = 1; | |
546 | args.out_args[0].size = sizeof(outarg); | |
547 | args.out_args[0].value = &outarg; | |
fcee216b | 548 | err = fuse_simple_request(fm, &args); |
e5e5558e MS |
549 | if (!err) |
550 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
551 | return err; |
552 | } | |
553 | ||
660585b5 MS |
554 | static struct fuse_sync_bucket *fuse_sync_bucket_alloc(void) |
555 | { | |
556 | struct fuse_sync_bucket *bucket; | |
557 | ||
558 | bucket = kzalloc(sizeof(*bucket), GFP_KERNEL | __GFP_NOFAIL); | |
559 | if (bucket) { | |
560 | init_waitqueue_head(&bucket->waitq); | |
561 | /* Initial active count */ | |
562 | atomic_set(&bucket->count, 1); | |
563 | } | |
564 | return bucket; | |
565 | } | |
566 | ||
567 | static void fuse_sync_fs_writes(struct fuse_conn *fc) | |
568 | { | |
569 | struct fuse_sync_bucket *bucket, *new_bucket; | |
570 | int count; | |
571 | ||
572 | new_bucket = fuse_sync_bucket_alloc(); | |
573 | spin_lock(&fc->lock); | |
574 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); | |
575 | count = atomic_read(&bucket->count); | |
576 | WARN_ON(count < 1); | |
577 | /* No outstanding writes? */ | |
578 | if (count == 1) { | |
579 | spin_unlock(&fc->lock); | |
580 | kfree(new_bucket); | |
581 | return; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Completion of new bucket depends on completion of this bucket, so add | |
586 | * one more count. | |
587 | */ | |
588 | atomic_inc(&new_bucket->count); | |
589 | rcu_assign_pointer(fc->curr_bucket, new_bucket); | |
590 | spin_unlock(&fc->lock); | |
591 | /* | |
592 | * Drop initial active count. At this point if all writes in this and | |
593 | * ancestor buckets complete, the count will go to zero and this task | |
594 | * will be woken up. | |
595 | */ | |
596 | atomic_dec(&bucket->count); | |
597 | ||
598 | wait_event(bucket->waitq, atomic_read(&bucket->count) == 0); | |
599 | ||
600 | /* Drop temp count on descendant bucket */ | |
601 | fuse_sync_bucket_dec(new_bucket); | |
602 | kfree_rcu(bucket, rcu); | |
603 | } | |
604 | ||
2d82ab25 GK |
605 | static int fuse_sync_fs(struct super_block *sb, int wait) |
606 | { | |
607 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
608 | struct fuse_conn *fc = fm->fc; | |
609 | struct fuse_syncfs_in inarg; | |
610 | FUSE_ARGS(args); | |
611 | int err; | |
612 | ||
613 | /* | |
614 | * Userspace cannot handle the wait == 0 case. Avoid a | |
615 | * gratuitous roundtrip. | |
616 | */ | |
617 | if (!wait) | |
618 | return 0; | |
619 | ||
620 | /* The filesystem is being unmounted. Nothing to do. */ | |
621 | if (!sb->s_root) | |
622 | return 0; | |
623 | ||
624 | if (!fc->sync_fs) | |
625 | return 0; | |
626 | ||
660585b5 MS |
627 | fuse_sync_fs_writes(fc); |
628 | ||
2d82ab25 GK |
629 | memset(&inarg, 0, sizeof(inarg)); |
630 | args.in_numargs = 1; | |
631 | args.in_args[0].size = sizeof(inarg); | |
632 | args.in_args[0].value = &inarg; | |
633 | args.opcode = FUSE_SYNCFS; | |
634 | args.nodeid = get_node_id(sb->s_root->d_inode); | |
635 | args.out_numargs = 0; | |
636 | ||
637 | err = fuse_simple_request(fm, &args); | |
638 | if (err == -ENOSYS) { | |
639 | fc->sync_fs = 0; | |
640 | err = 0; | |
641 | } | |
642 | ||
643 | return err; | |
644 | } | |
645 | ||
d8a5ba45 | 646 | enum { |
c30da2e9 DH |
647 | OPT_SOURCE, |
648 | OPT_SUBTYPE, | |
d8a5ba45 MS |
649 | OPT_FD, |
650 | OPT_ROOTMODE, | |
651 | OPT_USER_ID, | |
87729a55 | 652 | OPT_GROUP_ID, |
d8a5ba45 MS |
653 | OPT_DEFAULT_PERMISSIONS, |
654 | OPT_ALLOW_OTHER, | |
db50b96c | 655 | OPT_MAX_READ, |
d8091614 | 656 | OPT_BLKSIZE, |
d8a5ba45 MS |
657 | OPT_ERR |
658 | }; | |
659 | ||
d7167b14 | 660 | static const struct fs_parameter_spec fuse_fs_parameters[] = { |
c30da2e9 DH |
661 | fsparam_string ("source", OPT_SOURCE), |
662 | fsparam_u32 ("fd", OPT_FD), | |
663 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
664 | fsparam_u32 ("user_id", OPT_USER_ID), | |
665 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
666 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
667 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
668 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
669 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 670 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
671 | {} |
672 | }; | |
673 | ||
84c21507 | 674 | static int fuse_parse_param(struct fs_context *fsc, struct fs_parameter *param) |
233a01fa | 675 | { |
c30da2e9 | 676 | struct fs_parse_result result; |
84c21507 | 677 | struct fuse_fs_context *ctx = fsc->fs_private; |
c30da2e9 DH |
678 | int opt; |
679 | ||
84c21507 | 680 | if (fsc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { |
b330966f MS |
681 | /* |
682 | * Ignore options coming from mount(MS_REMOUNT) for backward | |
683 | * compatibility. | |
684 | */ | |
84c21507 | 685 | if (fsc->oldapi) |
b330966f MS |
686 | return 0; |
687 | ||
84c21507 | 688 | return invalfc(fsc, "No changes allowed in reconfigure"); |
b330966f | 689 | } |
e8b20a47 | 690 | |
84c21507 | 691 | opt = fs_parse(fsc, fuse_fs_parameters, param, &result); |
c30da2e9 DH |
692 | if (opt < 0) |
693 | return opt; | |
694 | ||
695 | switch (opt) { | |
696 | case OPT_SOURCE: | |
84c21507 MS |
697 | if (fsc->source) |
698 | return invalfc(fsc, "Multiple sources specified"); | |
699 | fsc->source = param->string; | |
c30da2e9 DH |
700 | param->string = NULL; |
701 | break; | |
702 | ||
703 | case OPT_SUBTYPE: | |
704 | if (ctx->subtype) | |
84c21507 | 705 | return invalfc(fsc, "Multiple subtypes specified"); |
c30da2e9 DH |
706 | ctx->subtype = param->string; |
707 | param->string = NULL; | |
708 | return 0; | |
709 | ||
710 | case OPT_FD: | |
711 | ctx->fd = result.uint_32; | |
cabdb4fa | 712 | ctx->fd_present = true; |
c30da2e9 DH |
713 | break; |
714 | ||
715 | case OPT_ROOTMODE: | |
716 | if (!fuse_valid_type(result.uint_32)) | |
84c21507 | 717 | return invalfc(fsc, "Invalid rootmode"); |
c30da2e9 | 718 | ctx->rootmode = result.uint_32; |
cabdb4fa | 719 | ctx->rootmode_present = true; |
c30da2e9 DH |
720 | break; |
721 | ||
722 | case OPT_USER_ID: | |
84c21507 | 723 | ctx->user_id = make_kuid(fsc->user_ns, result.uint_32); |
c30da2e9 | 724 | if (!uid_valid(ctx->user_id)) |
84c21507 | 725 | return invalfc(fsc, "Invalid user_id"); |
cabdb4fa | 726 | ctx->user_id_present = true; |
c30da2e9 DH |
727 | break; |
728 | ||
729 | case OPT_GROUP_ID: | |
84c21507 | 730 | ctx->group_id = make_kgid(fsc->user_ns, result.uint_32); |
c30da2e9 | 731 | if (!gid_valid(ctx->group_id)) |
84c21507 | 732 | return invalfc(fsc, "Invalid group_id"); |
cabdb4fa | 733 | ctx->group_id_present = true; |
c30da2e9 DH |
734 | break; |
735 | ||
736 | case OPT_DEFAULT_PERMISSIONS: | |
cabdb4fa | 737 | ctx->default_permissions = true; |
c30da2e9 DH |
738 | break; |
739 | ||
740 | case OPT_ALLOW_OTHER: | |
cabdb4fa | 741 | ctx->allow_other = true; |
c30da2e9 DH |
742 | break; |
743 | ||
744 | case OPT_MAX_READ: | |
745 | ctx->max_read = result.uint_32; | |
746 | break; | |
747 | ||
748 | case OPT_BLKSIZE: | |
749 | if (!ctx->is_bdev) | |
84c21507 | 750 | return invalfc(fsc, "blksize only supported for fuseblk"); |
c30da2e9 DH |
751 | ctx->blksize = result.uint_32; |
752 | break; | |
753 | ||
754 | default: | |
755 | return -EINVAL; | |
233a01fa | 756 | } |
c30da2e9 DH |
757 | |
758 | return 0; | |
233a01fa MS |
759 | } |
760 | ||
84c21507 | 761 | static void fuse_free_fsc(struct fs_context *fsc) |
d8a5ba45 | 762 | { |
84c21507 | 763 | struct fuse_fs_context *ctx = fsc->fs_private; |
5a533682 | 764 | |
c30da2e9 DH |
765 | if (ctx) { |
766 | kfree(ctx->subtype); | |
767 | kfree(ctx); | |
768 | } | |
d8a5ba45 MS |
769 | } |
770 | ||
34c80b1d | 771 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 772 | { |
34c80b1d AV |
773 | struct super_block *sb = root->d_sb; |
774 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 775 | |
f4fd4ae3 VG |
776 | if (fc->legacy_opts_show) { |
777 | seq_printf(m, ",user_id=%u", | |
778 | from_kuid_munged(fc->user_ns, fc->user_id)); | |
779 | seq_printf(m, ",group_id=%u", | |
780 | from_kgid_munged(fc->user_ns, fc->group_id)); | |
781 | if (fc->default_permissions) | |
782 | seq_puts(m, ",default_permissions"); | |
783 | if (fc->allow_other) | |
784 | seq_puts(m, ",allow_other"); | |
785 | if (fc->max_read != ~0) | |
786 | seq_printf(m, ",max_read=%u", fc->max_read); | |
787 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
788 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
789 | } | |
1dd53957 | 790 | #ifdef CONFIG_FUSE_DAX |
780b1b95 JX |
791 | if (fc->dax_mode == FUSE_DAX_ALWAYS) |
792 | seq_puts(m, ",dax=always"); | |
793 | else if (fc->dax_mode == FUSE_DAX_NEVER) | |
794 | seq_puts(m, ",dax=never"); | |
795 | else if (fc->dax_mode == FUSE_DAX_INODE_USER) | |
796 | seq_puts(m, ",dax=inode"); | |
1dd53957 | 797 | #endif |
3f22c746 | 798 | |
d8a5ba45 MS |
799 | return 0; |
800 | } | |
801 | ||
ae3aad77 SH |
802 | static void fuse_iqueue_init(struct fuse_iqueue *fiq, |
803 | const struct fuse_iqueue_ops *ops, | |
804 | void *priv) | |
f88996a9 MS |
805 | { |
806 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
76e43c8c | 807 | spin_lock_init(&fiq->lock); |
f88996a9 MS |
808 | init_waitqueue_head(&fiq->waitq); |
809 | INIT_LIST_HEAD(&fiq->pending); | |
810 | INIT_LIST_HEAD(&fiq->interrupts); | |
811 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 812 | fiq->connected = 1; |
ae3aad77 SH |
813 | fiq->ops = ops; |
814 | fiq->priv = priv; | |
f88996a9 MS |
815 | } |
816 | ||
3a2b5b9c MS |
817 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
818 | { | |
be2ff42c KT |
819 | unsigned int i; |
820 | ||
45a91cb1 | 821 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
822 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
823 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 824 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 825 | fpq->connected = 1; |
3a2b5b9c MS |
826 | } |
827 | ||
fcee216b MR |
828 | void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm, |
829 | struct user_namespace *user_ns, | |
ae3aad77 | 830 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) |
d8a5ba45 | 831 | { |
0d179aa5 TH |
832 | memset(fc, 0, sizeof(*fc)); |
833 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 834 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 835 | init_rwsem(&fc->killsb); |
095fc40a | 836 | refcount_set(&fc->count, 1); |
c3696046 | 837 | atomic_set(&fc->dev_count, 1); |
0d179aa5 | 838 | init_waitqueue_head(&fc->blocked_waitq); |
ae3aad77 | 839 | fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv); |
0d179aa5 TH |
840 | INIT_LIST_HEAD(&fc->bg_queue); |
841 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 842 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 843 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
844 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
845 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 846 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 847 | fc->polled_files = RB_ROOT; |
0aada884 | 848 | fc->blocked = 0; |
796523fb | 849 | fc->initialized = 0; |
e16714d8 | 850 | fc->connected = 1; |
4510d86f | 851 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 852 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 853 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 854 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 855 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
a7f0d7aa | 856 | fc->max_pages_limit = FUSE_MAX_MAX_PAGES; |
fcee216b MR |
857 | |
858 | INIT_LIST_HEAD(&fc->mounts); | |
859 | list_add(&fm->fc_entry, &fc->mounts); | |
860 | fm->fc = fc; | |
d8a5ba45 | 861 | } |
0d179aa5 | 862 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 863 | |
bafa9654 MS |
864 | void fuse_conn_put(struct fuse_conn *fc) |
865 | { | |
095fc40a | 866 | if (refcount_dec_and_test(&fc->count)) { |
a62a8ef9 | 867 | struct fuse_iqueue *fiq = &fc->iq; |
660585b5 | 868 | struct fuse_sync_bucket *bucket; |
a62a8ef9 | 869 | |
1dd53957 VG |
870 | if (IS_ENABLED(CONFIG_FUSE_DAX)) |
871 | fuse_dax_conn_free(fc); | |
a62a8ef9 SH |
872 | if (fiq->ops->release) |
873 | fiq->ops->release(fiq); | |
0b6e9ea0 | 874 | put_pid_ns(fc->pid_ns); |
8cb08329 | 875 | put_user_ns(fc->user_ns); |
660585b5 MS |
876 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); |
877 | if (bucket) { | |
878 | WARN_ON(atomic_read(&bucket->count) != 1); | |
879 | kfree(bucket); | |
880 | } | |
43901aab | 881 | fc->release(fc); |
d2a85164 | 882 | } |
bafa9654 | 883 | } |
08cbf542 | 884 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
885 | |
886 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
887 | { | |
095fc40a | 888 | refcount_inc(&fc->count); |
bafa9654 MS |
889 | return fc; |
890 | } | |
08cbf542 | 891 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 892 | |
b93f858a | 893 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
894 | { |
895 | struct fuse_attr attr; | |
896 | memset(&attr, 0, sizeof(attr)); | |
897 | ||
898 | attr.mode = mode; | |
899 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 900 | attr.nlink = 1; |
1fb69e78 | 901 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
902 | } |
903 | ||
1729a16c | 904 | struct fuse_inode_handle { |
dbd561d2 MS |
905 | u64 nodeid; |
906 | u32 generation; | |
907 | }; | |
908 | ||
909 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
910 | struct fuse_inode_handle *handle) | |
911 | { | |
33670fa2 | 912 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
913 | struct inode *inode; |
914 | struct dentry *entry; | |
915 | int err = -ESTALE; | |
916 | ||
917 | if (handle->nodeid == 0) | |
918 | goto out_err; | |
919 | ||
920 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
921 | if (!inode) { |
922 | struct fuse_entry_out outarg; | |
13983d06 | 923 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
924 | |
925 | if (!fc->export_support) | |
926 | goto out_err; | |
927 | ||
33670fa2 MS |
928 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
929 | &inode); | |
930 | if (err && err != -ENOENT) | |
931 | goto out_err; | |
932 | if (err || !inode) { | |
933 | err = -ESTALE; | |
934 | goto out_err; | |
935 | } | |
936 | err = -EIO; | |
937 | if (get_node_id(inode) != handle->nodeid) | |
938 | goto out_iput; | |
939 | } | |
dbd561d2 MS |
940 | err = -ESTALE; |
941 | if (inode->i_generation != handle->generation) | |
942 | goto out_iput; | |
943 | ||
44003728 | 944 | entry = d_obtain_alias(inode); |
c35eebe9 | 945 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 946 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
947 | |
948 | return entry; | |
949 | ||
950 | out_iput: | |
951 | iput(inode); | |
952 | out_err: | |
953 | return ERR_PTR(err); | |
954 | } | |
955 | ||
b0b0382b AV |
956 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
957 | struct inode *parent) | |
dbd561d2 | 958 | { |
b0b0382b | 959 | int len = parent ? 6 : 3; |
dbd561d2 MS |
960 | u64 nodeid; |
961 | u32 generation; | |
962 | ||
5fe0c237 AK |
963 | if (*max_len < len) { |
964 | *max_len = len; | |
94e07a75 | 965 | return FILEID_INVALID; |
5fe0c237 | 966 | } |
dbd561d2 MS |
967 | |
968 | nodeid = get_fuse_inode(inode)->nodeid; | |
969 | generation = inode->i_generation; | |
970 | ||
971 | fh[0] = (u32)(nodeid >> 32); | |
972 | fh[1] = (u32)(nodeid & 0xffffffff); | |
973 | fh[2] = generation; | |
974 | ||
b0b0382b | 975 | if (parent) { |
dbd561d2 MS |
976 | nodeid = get_fuse_inode(parent)->nodeid; |
977 | generation = parent->i_generation; | |
dbd561d2 MS |
978 | |
979 | fh[3] = (u32)(nodeid >> 32); | |
980 | fh[4] = (u32)(nodeid & 0xffffffff); | |
981 | fh[5] = generation; | |
982 | } | |
983 | ||
984 | *max_len = len; | |
b0b0382b | 985 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
986 | } |
987 | ||
988 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
989 | struct fid *fid, int fh_len, int fh_type) | |
990 | { | |
991 | struct fuse_inode_handle handle; | |
992 | ||
993 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
994 | return NULL; | |
995 | ||
996 | handle.nodeid = (u64) fid->raw[0] << 32; | |
997 | handle.nodeid |= (u64) fid->raw[1]; | |
998 | handle.generation = fid->raw[2]; | |
999 | return fuse_get_dentry(sb, &handle); | |
1000 | } | |
1001 | ||
1002 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
1003 | struct fid *fid, int fh_len, int fh_type) | |
1004 | { | |
1005 | struct fuse_inode_handle parent; | |
1006 | ||
1007 | if (fh_type != 0x82 || fh_len < 6) | |
1008 | return NULL; | |
1009 | ||
1010 | parent.nodeid = (u64) fid->raw[3] << 32; | |
1011 | parent.nodeid |= (u64) fid->raw[4]; | |
1012 | parent.generation = fid->raw[5]; | |
1013 | return fuse_get_dentry(sb, &parent); | |
1014 | } | |
1015 | ||
33670fa2 MS |
1016 | static struct dentry *fuse_get_parent(struct dentry *child) |
1017 | { | |
2b0143b5 | 1018 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
1019 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
1020 | struct inode *inode; | |
1021 | struct dentry *parent; | |
1022 | struct fuse_entry_out outarg; | |
33670fa2 MS |
1023 | int err; |
1024 | ||
1025 | if (!fc->export_support) | |
1026 | return ERR_PTR(-ESTALE); | |
1027 | ||
33670fa2 | 1028 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
80e5d1ff | 1029 | &dotdot_name, &outarg, &inode); |
44003728 CH |
1030 | if (err) { |
1031 | if (err == -ENOENT) | |
1032 | return ERR_PTR(-ESTALE); | |
33670fa2 | 1033 | return ERR_PTR(err); |
33670fa2 | 1034 | } |
44003728 CH |
1035 | |
1036 | parent = d_obtain_alias(inode); | |
c35eebe9 | 1037 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 1038 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
1039 | |
1040 | return parent; | |
1041 | } | |
dbd561d2 MS |
1042 | |
1043 | static const struct export_operations fuse_export_operations = { | |
1044 | .fh_to_dentry = fuse_fh_to_dentry, | |
1045 | .fh_to_parent = fuse_fh_to_parent, | |
1046 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 1047 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
1048 | }; |
1049 | ||
ee9b6d61 | 1050 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 1051 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 1052 | .free_inode = fuse_free_inode, |
b57922d9 | 1053 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 1054 | .write_inode = fuse_write_inode, |
ead5f0b5 | 1055 | .drop_inode = generic_delete_inode, |
69a53bf2 | 1056 | .umount_begin = fuse_umount_begin, |
e5e5558e | 1057 | .statfs = fuse_statfs, |
2d82ab25 | 1058 | .sync_fs = fuse_sync_fs, |
d8a5ba45 MS |
1059 | .show_options = fuse_show_options, |
1060 | }; | |
1061 | ||
487ea5af CH |
1062 | static void sanitize_global_limit(unsigned *limit) |
1063 | { | |
f22f812d MS |
1064 | /* |
1065 | * The default maximum number of async requests is calculated to consume | |
1066 | * 1/2^13 of the total memory, assuming 392 bytes per request. | |
1067 | */ | |
487ea5af | 1068 | if (*limit == 0) |
f22f812d | 1069 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392; |
487ea5af CH |
1070 | |
1071 | if (*limit >= 1 << 16) | |
1072 | *limit = (1 << 16) - 1; | |
1073 | } | |
1074 | ||
e4dca7b7 | 1075 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
1076 | { |
1077 | int rv; | |
1078 | ||
1079 | rv = param_set_uint(val, kp); | |
1080 | if (rv) | |
1081 | return rv; | |
1082 | ||
1083 | sanitize_global_limit((unsigned *)kp->arg); | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
1089 | { | |
1090 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
1091 | ||
1092 | if (arg->minor < 13) | |
1093 | return; | |
1094 | ||
1095 | sanitize_global_limit(&max_user_bgreq); | |
1096 | sanitize_global_limit(&max_user_congthresh); | |
1097 | ||
ae2dffa3 | 1098 | spin_lock(&fc->bg_lock); |
487ea5af CH |
1099 | if (arg->max_background) { |
1100 | fc->max_background = arg->max_background; | |
1101 | ||
1102 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
1103 | fc->max_background = max_user_bgreq; | |
1104 | } | |
1105 | if (arg->congestion_threshold) { | |
1106 | fc->congestion_threshold = arg->congestion_threshold; | |
1107 | ||
1108 | if (!cap_sys_admin && | |
1109 | fc->congestion_threshold > max_user_congthresh) | |
1110 | fc->congestion_threshold = max_user_congthresh; | |
1111 | } | |
ae2dffa3 | 1112 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
1113 | } |
1114 | ||
615047ef MS |
1115 | struct fuse_init_args { |
1116 | struct fuse_args args; | |
1117 | struct fuse_init_in in; | |
1118 | struct fuse_init_out out; | |
1119 | }; | |
1120 | ||
fcee216b | 1121 | static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args, |
615047ef | 1122 | int error) |
9b9a0469 | 1123 | { |
fcee216b | 1124 | struct fuse_conn *fc = fm->fc; |
615047ef MS |
1125 | struct fuse_init_args *ia = container_of(args, typeof(*ia), args); |
1126 | struct fuse_init_out *arg = &ia->out; | |
fd1a1dc6 | 1127 | bool ok = true; |
9b9a0469 | 1128 | |
615047ef | 1129 | if (error || arg->major != FUSE_KERNEL_VERSION) |
fd1a1dc6 | 1130 | ok = false; |
9b9a0469 | 1131 | else { |
9cd68455 MS |
1132 | unsigned long ra_pages; |
1133 | ||
487ea5af CH |
1134 | process_init_limits(fc, arg); |
1135 | ||
9cd68455 | 1136 | if (arg->minor >= 6) { |
3066ff93 BS |
1137 | u64 flags = arg->flags; |
1138 | ||
1139 | if (flags & FUSE_INIT_EXT) | |
1140 | flags |= (u64) arg->flags2 << 32; | |
53db2893 | 1141 | |
09cbfeaf | 1142 | ra_pages = arg->max_readahead / PAGE_SIZE; |
53db2893 | 1143 | if (flags & FUSE_ASYNC_READ) |
9cd68455 | 1144 | fc->async_read = 1; |
53db2893 | 1145 | if (!(flags & FUSE_POSIX_LOCKS)) |
71421259 | 1146 | fc->no_lock = 1; |
37fb3a30 | 1147 | if (arg->minor >= 17) { |
53db2893 | 1148 | if (!(flags & FUSE_FLOCK_LOCKS)) |
37fb3a30 | 1149 | fc->no_flock = 1; |
24114504 | 1150 | } else { |
53db2893 | 1151 | if (!(flags & FUSE_POSIX_LOCKS)) |
24114504 | 1152 | fc->no_flock = 1; |
37fb3a30 | 1153 | } |
53db2893 | 1154 | if (flags & FUSE_ATOMIC_O_TRUNC) |
6ff958ed | 1155 | fc->atomic_o_trunc = 1; |
33670fa2 MS |
1156 | if (arg->minor >= 9) { |
1157 | /* LOOKUP has dependency on proto version */ | |
53db2893 | 1158 | if (flags & FUSE_EXPORT_SUPPORT) |
33670fa2 MS |
1159 | fc->export_support = 1; |
1160 | } | |
53db2893 | 1161 | if (flags & FUSE_BIG_WRITES) |
78bb6cb9 | 1162 | fc->big_writes = 1; |
53db2893 | 1163 | if (flags & FUSE_DONT_MASK) |
e0a43ddc | 1164 | fc->dont_mask = 1; |
53db2893 | 1165 | if (flags & FUSE_AUTO_INVAL_DATA) |
72d0d248 | 1166 | fc->auto_inval_data = 1; |
53db2893 | 1167 | else if (flags & FUSE_EXPLICIT_INVAL_DATA) |
ad2ba64d | 1168 | fc->explicit_inval_data = 1; |
53db2893 | 1169 | if (flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 1170 | fc->do_readdirplus = 1; |
53db2893 | 1171 | if (flags & FUSE_READDIRPLUS_AUTO) |
28420dad MS |
1172 | fc->readdirplus_auto = 1; |
1173 | } | |
53db2893 | 1174 | if (flags & FUSE_ASYNC_DIO) |
60b9df7a | 1175 | fc->async_dio = 1; |
53db2893 | 1176 | if (flags & FUSE_WRITEBACK_CACHE) |
4d99ff8f | 1177 | fc->writeback_cache = 1; |
53db2893 | 1178 | if (flags & FUSE_PARALLEL_DIROPS) |
5c672ab3 | 1179 | fc->parallel_dirops = 1; |
53db2893 | 1180 | if (flags & FUSE_HANDLE_KILLPRIV) |
5e940c1d | 1181 | fc->handle_killpriv = 1; |
e27c9d38 | 1182 | if (arg->time_gran && arg->time_gran <= 1000000000) |
fcee216b | 1183 | fm->sb->s_time_gran = arg->time_gran; |
53db2893 | 1184 | if ((flags & FUSE_POSIX_ACL)) { |
29433a29 | 1185 | fc->default_permissions = 1; |
60bcc88a | 1186 | fc->posix_acl = 1; |
60bcc88a | 1187 | } |
53db2893 | 1188 | if (flags & FUSE_CACHE_SYMLINKS) |
5571f1e6 | 1189 | fc->cache_symlinks = 1; |
53db2893 | 1190 | if (flags & FUSE_ABORT_ERROR) |
3b7008b2 | 1191 | fc->abort_err = 1; |
53db2893 | 1192 | if (flags & FUSE_MAX_PAGES) { |
5da784cc | 1193 | fc->max_pages = |
a7f0d7aa | 1194 | min_t(unsigned int, fc->max_pages_limit, |
5da784cc CS |
1195 | max_t(unsigned int, arg->max_pages, 1)); |
1196 | } | |
2ee019fa JX |
1197 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
1198 | if (flags & FUSE_MAP_ALIGNMENT && | |
1199 | !fuse_dax_check_alignment(fc, arg->map_alignment)) { | |
1200 | ok = false; | |
1201 | } | |
1202 | if (flags & FUSE_HAS_INODE_DAX) | |
1203 | fc->inode_dax = 1; | |
fd1a1dc6 | 1204 | } |
53db2893 | 1205 | if (flags & FUSE_HANDLE_KILLPRIV_V2) { |
63f9909f | 1206 | fc->handle_killpriv_v2 = 1; |
9d769e6a VG |
1207 | fm->sb->s_flags |= SB_NOSEC; |
1208 | } | |
53db2893 | 1209 | if (flags & FUSE_SETXATTR_EXT) |
52a4c95f | 1210 | fc->setxattr_ext = 1; |
3e2b6fdb VG |
1211 | if (flags & FUSE_SECURITY_CTX) |
1212 | fc->init_security = 1; | |
8ed7cb3f MS |
1213 | if (flags & FUSE_CREATE_SUPP_GROUP) |
1214 | fc->create_supp_group = 1; | |
e78662e8 HX |
1215 | if (flags & FUSE_DIRECT_IO_RELAX) |
1216 | fc->direct_io_relax = 1; | |
71421259 | 1217 | } else { |
09cbfeaf | 1218 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 1219 | fc->no_lock = 1; |
37fb3a30 | 1220 | fc->no_flock = 1; |
71421259 | 1221 | } |
9cd68455 | 1222 | |
fcee216b MR |
1223 | fm->sb->s_bdi->ra_pages = |
1224 | min(fm->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
1225 | fc->minor = arg->minor; |
1226 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 1227 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 1228 | fc->conn_init = 1; |
9b9a0469 | 1229 | } |
615047ef MS |
1230 | kfree(ia); |
1231 | ||
fd1a1dc6 SH |
1232 | if (!ok) { |
1233 | fc->conn_init = 0; | |
1234 | fc->conn_error = 1; | |
1235 | } | |
1236 | ||
9759bd51 | 1237 | fuse_set_initialized(fc); |
08a53cdc | 1238 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
1239 | } |
1240 | ||
fcee216b | 1241 | void fuse_send_init(struct fuse_mount *fm) |
9b9a0469 | 1242 | { |
615047ef | 1243 | struct fuse_init_args *ia; |
53db2893 | 1244 | u64 flags; |
095da6cb | 1245 | |
615047ef MS |
1246 | ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL); |
1247 | ||
1248 | ia->in.major = FUSE_KERNEL_VERSION; | |
1249 | ia->in.minor = FUSE_KERNEL_MINOR_VERSION; | |
fcee216b | 1250 | ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE; |
53db2893 | 1251 | flags = |
615047ef | 1252 | FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 1253 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 1254 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 1255 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 1256 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 1257 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 1258 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 1259 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
63f9909f | 1260 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA | |
3e2b6fdb | 1261 | FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT | |
5cadfbd5 | 1262 | FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP | |
e78662e8 | 1263 | FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_RELAX; |
fd1a1dc6 | 1264 | #ifdef CONFIG_FUSE_DAX |
fcee216b | 1265 | if (fm->fc->dax) |
53db2893 | 1266 | flags |= FUSE_MAP_ALIGNMENT; |
2ee019fa JX |
1267 | if (fuse_is_inode_dax_mode(fm->fc->dax_mode)) |
1268 | flags |= FUSE_HAS_INODE_DAX; | |
fd1a1dc6 | 1269 | #endif |
bf109c64 | 1270 | if (fm->fc->auto_submounts) |
53db2893 MS |
1271 | flags |= FUSE_SUBMOUNTS; |
1272 | ||
1273 | ia->in.flags = flags; | |
1274 | ia->in.flags2 = flags >> 32; | |
bf109c64 | 1275 | |
615047ef MS |
1276 | ia->args.opcode = FUSE_INIT; |
1277 | ia->args.in_numargs = 1; | |
1278 | ia->args.in_args[0].size = sizeof(ia->in); | |
1279 | ia->args.in_args[0].value = &ia->in; | |
1280 | ia->args.out_numargs = 1; | |
3ad2f3fb | 1281 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
1282 | with interface version < 7.5. Rest of init_out is zeroed |
1283 | by do_get_request(), so a short reply is not a problem */ | |
cabdb4fa | 1284 | ia->args.out_argvar = true; |
615047ef MS |
1285 | ia->args.out_args[0].size = sizeof(ia->out); |
1286 | ia->args.out_args[0].value = &ia->out; | |
1287 | ia->args.force = true; | |
1288 | ia->args.nocreds = true; | |
1289 | ia->args.end = process_init_reply; | |
1290 | ||
fcee216b MR |
1291 | if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0) |
1292 | process_init_reply(fm, &ia->args, -ENOTCONN); | |
9b9a0469 | 1293 | } |
95a84cdb | 1294 | EXPORT_SYMBOL_GPL(fuse_send_init); |
9b9a0469 | 1295 | |
783863d6 | 1296 | void fuse_free_conn(struct fuse_conn *fc) |
43901aab | 1297 | { |
cc080e9e | 1298 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 1299 | kfree_rcu(fc, rcu); |
43901aab | 1300 | } |
783863d6 | 1301 | EXPORT_SYMBOL_GPL(fuse_free_conn); |
43901aab | 1302 | |
a325f9b9 TH |
1303 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1304 | { | |
1305 | int err; | |
5f7f7543 | 1306 | char *suffix = ""; |
a325f9b9 | 1307 | |
69c8ebf8 | 1308 | if (sb->s_bdev) { |
5f7f7543 | 1309 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1310 | /* |
1311 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1312 | * it to our private bdi... | |
1313 | */ | |
1314 | bdi_put(sb->s_bdi); | |
1315 | sb->s_bdi = &noop_backing_dev_info; | |
1316 | } | |
5f7f7543 JK |
1317 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1318 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1319 | if (err) |
1320 | return err; | |
1321 | ||
5f7f7543 | 1322 | /* fuse does it's own writeback accounting */ |
823423ef CH |
1323 | sb->s_bdi->capabilities &= ~BDI_CAP_WRITEBACK_ACCT; |
1324 | sb->s_bdi->capabilities |= BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1325 | |
a325f9b9 TH |
1326 | /* |
1327 | * For a single fuse filesystem use max 1% of dirty + | |
1328 | * writeback threshold. | |
1329 | * | |
1330 | * This gives about 1M of write buffer for memory maps on a | |
1331 | * machine with 1G and 10% dirty_ratio, which should be more | |
1332 | * than enough. | |
1333 | * | |
1334 | * Privileged users can raise it by writing to | |
1335 | * | |
1336 | * /sys/class/bdi/<bdi>/max_ratio | |
1337 | */ | |
5f7f7543 | 1338 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1339 | |
1340 | return 0; | |
1341 | } | |
1342 | ||
0cd1eb9a | 1343 | struct fuse_dev *fuse_dev_alloc(void) |
cc080e9e MS |
1344 | { |
1345 | struct fuse_dev *fud; | |
be2ff42c | 1346 | struct list_head *pq; |
cc080e9e MS |
1347 | |
1348 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1349 | if (!fud) |
1350 | return NULL; | |
cc080e9e | 1351 | |
be2ff42c KT |
1352 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1353 | if (!pq) { | |
1354 | kfree(fud); | |
1355 | return NULL; | |
cc080e9e MS |
1356 | } |
1357 | ||
be2ff42c | 1358 | fud->pq.processing = pq; |
be2ff42c KT |
1359 | fuse_pqueue_init(&fud->pq); |
1360 | ||
0cd1eb9a VG |
1361 | return fud; |
1362 | } | |
1363 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1364 | ||
1365 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc) | |
1366 | { | |
1367 | fud->fc = fuse_conn_get(fc); | |
be2ff42c KT |
1368 | spin_lock(&fc->lock); |
1369 | list_add_tail(&fud->entry, &fc->devices); | |
1370 | spin_unlock(&fc->lock); | |
0cd1eb9a VG |
1371 | } |
1372 | EXPORT_SYMBOL_GPL(fuse_dev_install); | |
be2ff42c | 1373 | |
0cd1eb9a VG |
1374 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc) |
1375 | { | |
1376 | struct fuse_dev *fud; | |
1377 | ||
1378 | fud = fuse_dev_alloc(); | |
1379 | if (!fud) | |
1380 | return NULL; | |
1381 | ||
1382 | fuse_dev_install(fud, fc); | |
cc080e9e MS |
1383 | return fud; |
1384 | } | |
0cd1eb9a | 1385 | EXPORT_SYMBOL_GPL(fuse_dev_alloc_install); |
cc080e9e MS |
1386 | |
1387 | void fuse_dev_free(struct fuse_dev *fud) | |
1388 | { | |
1389 | struct fuse_conn *fc = fud->fc; | |
1390 | ||
1391 | if (fc) { | |
1392 | spin_lock(&fc->lock); | |
1393 | list_del(&fud->entry); | |
1394 | spin_unlock(&fc->lock); | |
1395 | ||
1396 | fuse_conn_put(fc); | |
1397 | } | |
d72f70da | 1398 | kfree(fud->pq.processing); |
cc080e9e MS |
1399 | kfree(fud); |
1400 | } | |
1401 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1402 | ||
1866d779 MR |
1403 | static void fuse_fill_attr_from_inode(struct fuse_attr *attr, |
1404 | const struct fuse_inode *fi) | |
1405 | { | |
1406 | *attr = (struct fuse_attr){ | |
1407 | .ino = fi->inode.i_ino, | |
1408 | .size = fi->inode.i_size, | |
1409 | .blocks = fi->inode.i_blocks, | |
1410 | .atime = fi->inode.i_atime.tv_sec, | |
1411 | .mtime = fi->inode.i_mtime.tv_sec, | |
1412 | .ctime = fi->inode.i_ctime.tv_sec, | |
1413 | .atimensec = fi->inode.i_atime.tv_nsec, | |
1414 | .mtimensec = fi->inode.i_mtime.tv_nsec, | |
1415 | .ctimensec = fi->inode.i_ctime.tv_nsec, | |
1416 | .mode = fi->inode.i_mode, | |
1417 | .nlink = fi->inode.i_nlink, | |
1418 | .uid = fi->inode.i_uid.val, | |
1419 | .gid = fi->inode.i_gid.val, | |
1420 | .rdev = fi->inode.i_rdev, | |
1421 | .blksize = 1u << fi->inode.i_blkbits, | |
1422 | }; | |
1423 | } | |
1424 | ||
1425 | static void fuse_sb_defaults(struct super_block *sb) | |
1426 | { | |
1427 | sb->s_magic = FUSE_SUPER_MAGIC; | |
1428 | sb->s_op = &fuse_super_operations; | |
1429 | sb->s_xattr = fuse_xattr_handlers; | |
1430 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1431 | sb->s_time_gran = 1; | |
1432 | sb->s_export_op = &fuse_export_operations; | |
1433 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; | |
1434 | if (sb->s_user_ns != &init_user_ns) | |
1435 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
1436 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); | |
1866d779 MR |
1437 | } |
1438 | ||
1b539917 GK |
1439 | static int fuse_fill_super_submount(struct super_block *sb, |
1440 | struct fuse_inode *parent_fi) | |
1866d779 MR |
1441 | { |
1442 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
1443 | struct super_block *parent_sb = parent_fi->inode.i_sb; | |
1444 | struct fuse_attr root_attr; | |
1445 | struct inode *root; | |
1446 | ||
1447 | fuse_sb_defaults(sb); | |
1448 | fm->sb = sb; | |
1449 | ||
1450 | WARN_ON(sb->s_bdi != &noop_backing_dev_info); | |
1451 | sb->s_bdi = bdi_get(parent_sb->s_bdi); | |
1452 | ||
1453 | sb->s_xattr = parent_sb->s_xattr; | |
1454 | sb->s_time_gran = parent_sb->s_time_gran; | |
1455 | sb->s_blocksize = parent_sb->s_blocksize; | |
1456 | sb->s_blocksize_bits = parent_sb->s_blocksize_bits; | |
1457 | sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL); | |
1458 | if (parent_sb->s_subtype && !sb->s_subtype) | |
1459 | return -ENOMEM; | |
1460 | ||
1461 | fuse_fill_attr_from_inode(&root_attr, parent_fi); | |
1462 | root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0); | |
1463 | /* | |
1464 | * This inode is just a duplicate, so it is not looked up and | |
1465 | * its nlookup should not be incremented. fuse_iget() does | |
1466 | * that, though, so undo it here. | |
1467 | */ | |
1468 | get_fuse_inode(root)->nlookup--; | |
1469 | sb->s_d_op = &fuse_dentry_operations; | |
1470 | sb->s_root = d_make_root(root); | |
1471 | if (!sb->s_root) | |
1472 | return -ENOMEM; | |
1473 | ||
1474 | return 0; | |
1475 | } | |
1476 | ||
266eb3f2 | 1477 | /* Filesystem context private data holds the FUSE inode of the mount point */ |
fe0a7bd8 GK |
1478 | static int fuse_get_tree_submount(struct fs_context *fsc) |
1479 | { | |
266eb3f2 GK |
1480 | struct fuse_mount *fm; |
1481 | struct fuse_inode *mp_fi = fsc->fs_private; | |
1482 | struct fuse_conn *fc = get_fuse_conn(&mp_fi->inode); | |
1483 | struct super_block *sb; | |
1484 | int err; | |
1485 | ||
1486 | fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); | |
1487 | if (!fm) | |
1488 | return -ENOMEM; | |
1489 | ||
c191cd07 | 1490 | fm->fc = fuse_conn_get(fc); |
266eb3f2 GK |
1491 | fsc->s_fs_info = fm; |
1492 | sb = sget_fc(fsc, NULL, set_anon_super_fc); | |
c191cd07 MS |
1493 | if (fsc->s_fs_info) |
1494 | fuse_mount_destroy(fm); | |
1495 | if (IS_ERR(sb)) | |
266eb3f2 | 1496 | return PTR_ERR(sb); |
266eb3f2 GK |
1497 | |
1498 | /* Initialize superblock, making @mp_fi its root */ | |
1499 | err = fuse_fill_super_submount(sb, mp_fi); | |
1500 | if (err) { | |
266eb3f2 GK |
1501 | deactivate_locked_super(sb); |
1502 | return err; | |
1503 | } | |
1504 | ||
1505 | down_write(&fc->killsb); | |
1506 | list_add_tail(&fm->fc_entry, &fc->mounts); | |
1507 | up_write(&fc->killsb); | |
1508 | ||
1509 | sb->s_flags |= SB_ACTIVE; | |
1510 | fsc->root = dget(sb->s_root); | |
1511 | ||
fe0a7bd8 GK |
1512 | return 0; |
1513 | } | |
1514 | ||
1515 | static const struct fs_context_operations fuse_context_submount_ops = { | |
1516 | .get_tree = fuse_get_tree_submount, | |
1517 | }; | |
1518 | ||
1519 | int fuse_init_fs_context_submount(struct fs_context *fsc) | |
1520 | { | |
1521 | fsc->ops = &fuse_context_submount_ops; | |
1522 | return 0; | |
1523 | } | |
1524 | EXPORT_SYMBOL_GPL(fuse_init_fs_context_submount); | |
1525 | ||
0cc2656c | 1526 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) |
d8a5ba45 | 1527 | { |
7fd3abfa | 1528 | struct fuse_dev *fud = NULL; |
fcee216b MR |
1529 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1530 | struct fuse_conn *fc = fm->fc; | |
d8a5ba45 | 1531 | struct inode *root; |
f543f253 | 1532 | struct dentry *root_dentry; |
d8a5ba45 MS |
1533 | int err; |
1534 | ||
c2b8f006 | 1535 | err = -EINVAL; |
1751e8a6 | 1536 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1537 | goto err; |
71421259 | 1538 | |
660585b5 | 1539 | rcu_assign_pointer(fc->curr_bucket, fuse_sync_bucket_alloc()); |
1866d779 | 1540 | fuse_sb_defaults(sb); |
9e1f1de0 | 1541 | |
0cc2656c | 1542 | if (ctx->is_bdev) { |
875d95ec | 1543 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1544 | err = -EINVAL; |
c30da2e9 | 1545 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1546 | goto err; |
875d95ec | 1547 | #endif |
d8091614 | 1548 | } else { |
09cbfeaf KS |
1549 | sb->s_blocksize = PAGE_SIZE; |
1550 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1551 | } |
c30da2e9 DH |
1552 | |
1553 | sb->s_subtype = ctx->subtype; | |
1554 | ctx->subtype = NULL; | |
1dd53957 | 1555 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
780b1b95 | 1556 | err = fuse_dax_conn_alloc(fc, ctx->dax_mode, ctx->dax_dev); |
1dd53957 VG |
1557 | if (err) |
1558 | goto err; | |
1559 | } | |
e45b2546 | 1560 | |
7fd3abfa VG |
1561 | if (ctx->fudptr) { |
1562 | err = -ENOMEM; | |
1563 | fud = fuse_dev_alloc_install(fc); | |
1564 | if (!fud) | |
1dd53957 | 1565 | goto err_free_dax; |
7fd3abfa | 1566 | } |
cc080e9e | 1567 | |
a325f9b9 | 1568 | fc->dev = sb->s_dev; |
fcee216b | 1569 | fm->sb = sb; |
a325f9b9 TH |
1570 | err = fuse_bdi_init(fc, sb); |
1571 | if (err) | |
cc080e9e | 1572 | goto err_dev_free; |
0d179aa5 | 1573 | |
e0a43ddc | 1574 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1575 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1576 | fc->dont_mask = 1; |
1751e8a6 | 1577 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1578 | |
c30da2e9 DH |
1579 | fc->default_permissions = ctx->default_permissions; |
1580 | fc->allow_other = ctx->allow_other; | |
1581 | fc->user_id = ctx->user_id; | |
1582 | fc->group_id = ctx->group_id; | |
f4fd4ae3 | 1583 | fc->legacy_opts_show = ctx->legacy_opts_show; |
1866d779 | 1584 | fc->max_read = max_t(unsigned int, 4096, ctx->max_read); |
783863d6 | 1585 | fc->destroy = ctx->destroy; |
15c8e72e VG |
1586 | fc->no_control = ctx->no_control; |
1587 | fc->no_force_umount = ctx->no_force_umount; | |
f543f253 | 1588 | |
d8a5ba45 | 1589 | err = -ENOMEM; |
c30da2e9 | 1590 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1591 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1592 | root_dentry = d_make_root(root); |
1593 | if (!root_dentry) | |
cc080e9e | 1594 | goto err_dev_free; |
0ce267ff | 1595 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1596 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1597 | |
bafa9654 | 1598 | mutex_lock(&fuse_mutex); |
8aa09a50 | 1599 | err = -EINVAL; |
7fd3abfa | 1600 | if (ctx->fudptr && *ctx->fudptr) |
bafa9654 | 1601 | goto err_unlock; |
8aa09a50 | 1602 | |
bafa9654 MS |
1603 | err = fuse_ctl_add_conn(fc); |
1604 | if (err) | |
1605 | goto err_unlock; | |
1606 | ||
1607 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1608 | sb->s_root = root_dentry; |
7fd3abfa VG |
1609 | if (ctx->fudptr) |
1610 | *ctx->fudptr = fud; | |
bafa9654 | 1611 | mutex_unlock(&fuse_mutex); |
0cc2656c SH |
1612 | return 0; |
1613 | ||
1614 | err_unlock: | |
1615 | mutex_unlock(&fuse_mutex); | |
1616 | dput(root_dentry); | |
1617 | err_dev_free: | |
7fd3abfa VG |
1618 | if (fud) |
1619 | fuse_dev_free(fud); | |
1dd53957 VG |
1620 | err_free_dax: |
1621 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
1622 | fuse_dax_conn_free(fc); | |
0cc2656c SH |
1623 | err: |
1624 | return err; | |
1625 | } | |
1626 | EXPORT_SYMBOL_GPL(fuse_fill_super_common); | |
1627 | ||
1628 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) | |
1629 | { | |
1630 | struct fuse_fs_context *ctx = fsc->fs_private; | |
0cc2656c | 1631 | int err; |
0cc2656c | 1632 | |
62dd1fc8 | 1633 | if (!ctx->file || !ctx->rootmode_present || |
badc7414 MS |
1634 | !ctx->user_id_present || !ctx->group_id_present) |
1635 | return -EINVAL; | |
0cc2656c SH |
1636 | |
1637 | /* | |
1638 | * Require mount to happen from the same user namespace which | |
1639 | * opened /dev/fuse to prevent potential attacks. | |
1640 | */ | |
62dd1fc8 MS |
1641 | if ((ctx->file->f_op != &fuse_dev_operations) || |
1642 | (ctx->file->f_cred->user_ns != sb->s_user_ns)) | |
964d32e5 | 1643 | return -EINVAL; |
62dd1fc8 | 1644 | ctx->fudptr = &ctx->file->private_data; |
0cc2656c | 1645 | |
0cc2656c SH |
1646 | err = fuse_fill_super_common(sb, ctx); |
1647 | if (err) | |
964d32e5 | 1648 | return err; |
62dd1fc8 MS |
1649 | /* file->private_data shall be visible on all CPUs after this */ |
1650 | smp_mb(); | |
fcee216b | 1651 | fuse_send_init(get_fuse_mount_super(sb)); |
d8a5ba45 | 1652 | return 0; |
d8a5ba45 MS |
1653 | } |
1654 | ||
5d5b74aa MS |
1655 | /* |
1656 | * This is the path where user supplied an already initialized fuse dev. In | |
1657 | * this case never create a new super if the old one is gone. | |
1658 | */ | |
1659 | static int fuse_set_no_super(struct super_block *sb, struct fs_context *fsc) | |
d8a5ba45 | 1660 | { |
5d5b74aa MS |
1661 | return -ENOTCONN; |
1662 | } | |
c30da2e9 | 1663 | |
5d5b74aa MS |
1664 | static int fuse_test_super(struct super_block *sb, struct fs_context *fsc) |
1665 | { | |
c30da2e9 | 1666 | |
5d5b74aa MS |
1667 | return fsc->sget_key == get_fuse_conn_super(sb); |
1668 | } | |
1669 | ||
84c21507 | 1670 | static int fuse_get_tree(struct fs_context *fsc) |
d8a5ba45 | 1671 | { |
84c21507 | 1672 | struct fuse_fs_context *ctx = fsc->fs_private; |
5d5b74aa | 1673 | struct fuse_dev *fud; |
80019f11 MS |
1674 | struct fuse_conn *fc; |
1675 | struct fuse_mount *fm; | |
5d5b74aa | 1676 | struct super_block *sb; |
62dd1fc8 | 1677 | int err; |
c30da2e9 | 1678 | |
80019f11 MS |
1679 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
1680 | if (!fc) | |
1681 | return -ENOMEM; | |
1682 | ||
1683 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); | |
1684 | if (!fm) { | |
1685 | kfree(fc); | |
1686 | return -ENOMEM; | |
1687 | } | |
1688 | ||
1689 | fuse_conn_init(fc, fm, fsc->user_ns, &fuse_dev_fiq_ops, NULL); | |
1690 | fc->release = fuse_free_conn; | |
1691 | ||
1692 | fsc->s_fs_info = fm; | |
1693 | ||
62dd1fc8 MS |
1694 | if (ctx->fd_present) |
1695 | ctx->file = fget(ctx->fd); | |
c30da2e9 | 1696 | |
badc7414 | 1697 | if (IS_ENABLED(CONFIG_BLOCK) && ctx->is_bdev) { |
62dd1fc8 | 1698 | err = get_tree_bdev(fsc, fuse_fill_super); |
80019f11 | 1699 | goto out; |
badc7414 | 1700 | } |
5d5b74aa MS |
1701 | /* |
1702 | * While block dev mount can be initialized with a dummy device fd | |
1703 | * (found by device name), normal fuse mounts can't | |
1704 | */ | |
80019f11 | 1705 | err = -EINVAL; |
5d5b74aa | 1706 | if (!ctx->file) |
80019f11 | 1707 | goto out; |
c30da2e9 | 1708 | |
5d5b74aa MS |
1709 | /* |
1710 | * Allow creating a fuse mount with an already initialized fuse | |
1711 | * connection | |
1712 | */ | |
1713 | fud = READ_ONCE(ctx->file->private_data); | |
1714 | if (ctx->file->f_op == &fuse_dev_operations && fud) { | |
1715 | fsc->sget_key = fud->fc; | |
1716 | sb = sget_fc(fsc, fuse_test_super, fuse_set_no_super); | |
1717 | err = PTR_ERR_OR_ZERO(sb); | |
1718 | if (!IS_ERR(sb)) | |
1719 | fsc->root = dget(sb->s_root); | |
1720 | } else { | |
1721 | err = get_tree_nodev(fsc, fuse_fill_super); | |
1722 | } | |
80019f11 MS |
1723 | out: |
1724 | if (fsc->s_fs_info) | |
1725 | fuse_mount_destroy(fm); | |
62dd1fc8 MS |
1726 | if (ctx->file) |
1727 | fput(ctx->file); | |
1728 | return err; | |
c30da2e9 DH |
1729 | } |
1730 | ||
1731 | static const struct fs_context_operations fuse_context_ops = { | |
84c21507 | 1732 | .free = fuse_free_fsc, |
c30da2e9 | 1733 | .parse_param = fuse_parse_param, |
0189a2d3 | 1734 | .reconfigure = fuse_reconfigure, |
c30da2e9 DH |
1735 | .get_tree = fuse_get_tree, |
1736 | }; | |
1737 | ||
1738 | /* | |
1739 | * Set up the filesystem mount context. | |
1740 | */ | |
84c21507 | 1741 | static int fuse_init_fs_context(struct fs_context *fsc) |
c30da2e9 DH |
1742 | { |
1743 | struct fuse_fs_context *ctx; | |
1744 | ||
1745 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1746 | if (!ctx) | |
1747 | return -ENOMEM; | |
1748 | ||
1749 | ctx->max_read = ~0; | |
1750 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
f4fd4ae3 | 1751 | ctx->legacy_opts_show = true; |
c30da2e9 DH |
1752 | |
1753 | #ifdef CONFIG_BLOCK | |
84c21507 | 1754 | if (fsc->fs_type == &fuseblk_fs_type) { |
c30da2e9 | 1755 | ctx->is_bdev = true; |
783863d6 MS |
1756 | ctx->destroy = true; |
1757 | } | |
c30da2e9 DH |
1758 | #endif |
1759 | ||
84c21507 MS |
1760 | fsc->fs_private = ctx; |
1761 | fsc->ops = &fuse_context_ops; | |
c30da2e9 | 1762 | return 0; |
d8a5ba45 MS |
1763 | } |
1764 | ||
fcee216b | 1765 | bool fuse_mount_remove(struct fuse_mount *fm) |
3b463ae0 | 1766 | { |
fcee216b MR |
1767 | struct fuse_conn *fc = fm->fc; |
1768 | bool last = false; | |
3b463ae0 | 1769 | |
fcee216b MR |
1770 | down_write(&fc->killsb); |
1771 | list_del_init(&fm->fc_entry); | |
1772 | if (list_empty(&fc->mounts)) | |
1773 | last = true; | |
1774 | up_write(&fc->killsb); | |
e8f3bd77 | 1775 | |
fcee216b MR |
1776 | return last; |
1777 | } | |
1778 | EXPORT_SYMBOL_GPL(fuse_mount_remove); | |
e8f3bd77 | 1779 | |
fcee216b MR |
1780 | void fuse_conn_destroy(struct fuse_mount *fm) |
1781 | { | |
1782 | struct fuse_conn *fc = fm->fc; | |
1783 | ||
1784 | if (fc->destroy) | |
1785 | fuse_send_destroy(fm); | |
1786 | ||
1787 | fuse_abort_conn(fc); | |
1788 | fuse_wait_aborted(fc); | |
413daa1a MS |
1789 | |
1790 | if (!list_empty(&fc->entry)) { | |
1791 | mutex_lock(&fuse_mutex); | |
1792 | list_del(&fc->entry); | |
1793 | fuse_ctl_remove_conn(fc); | |
1794 | mutex_unlock(&fuse_mutex); | |
3b463ae0 | 1795 | } |
e8f3bd77 | 1796 | } |
fcee216b | 1797 | EXPORT_SYMBOL_GPL(fuse_conn_destroy); |
3b463ae0 | 1798 | |
6a68d1e1 | 1799 | static void fuse_sb_destroy(struct super_block *sb) |
e8f3bd77 | 1800 | { |
fcee216b MR |
1801 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1802 | bool last; | |
1803 | ||
d534d31d | 1804 | if (sb->s_root) { |
fcee216b MR |
1805 | last = fuse_mount_remove(fm); |
1806 | if (last) | |
1807 | fuse_conn_destroy(fm); | |
1808 | } | |
6a68d1e1 MS |
1809 | } |
1810 | ||
a27c061a MS |
1811 | void fuse_mount_destroy(struct fuse_mount *fm) |
1812 | { | |
80019f11 MS |
1813 | fuse_conn_put(fm->fc); |
1814 | kfree(fm); | |
a27c061a MS |
1815 | } |
1816 | EXPORT_SYMBOL(fuse_mount_destroy); | |
1817 | ||
6a68d1e1 MS |
1818 | static void fuse_kill_sb_anon(struct super_block *sb) |
1819 | { | |
1820 | fuse_sb_destroy(sb); | |
3b463ae0 | 1821 | kill_anon_super(sb); |
a27c061a | 1822 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1823 | } |
1824 | ||
875d95ec MS |
1825 | static struct file_system_type fuse_fs_type = { |
1826 | .owner = THIS_MODULE, | |
1827 | .name = "fuse", | |
4ad769f3 | 1828 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 | 1829 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1830 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1831 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1832 | }; |
7f78e035 | 1833 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1834 | |
1835 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1836 | static void fuse_kill_sb_blk(struct super_block *sb) |
1837 | { | |
6a68d1e1 | 1838 | fuse_sb_destroy(sb); |
3b463ae0 | 1839 | kill_block_super(sb); |
a27c061a | 1840 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1841 | } |
1842 | ||
d6392f87 MS |
1843 | static struct file_system_type fuseblk_fs_type = { |
1844 | .owner = THIS_MODULE, | |
1845 | .name = "fuseblk", | |
c30da2e9 | 1846 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1847 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1848 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1849 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1850 | }; |
7f78e035 | 1851 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1852 | |
875d95ec MS |
1853 | static inline int register_fuseblk(void) |
1854 | { | |
1855 | return register_filesystem(&fuseblk_fs_type); | |
1856 | } | |
1857 | ||
1858 | static inline void unregister_fuseblk(void) | |
1859 | { | |
1860 | unregister_filesystem(&fuseblk_fs_type); | |
1861 | } | |
1862 | #else | |
1863 | static inline int register_fuseblk(void) | |
1864 | { | |
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | static inline void unregister_fuseblk(void) | |
1869 | { | |
1870 | } | |
1871 | #endif | |
1872 | ||
51cc5068 | 1873 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1874 | { |
1729a16c | 1875 | struct inode *inode = foo; |
d8a5ba45 | 1876 | |
a35afb83 | 1877 | inode_init_once(inode); |
d8a5ba45 MS |
1878 | } |
1879 | ||
1880 | static int __init fuse_fs_init(void) | |
1881 | { | |
1882 | int err; | |
1883 | ||
d6392f87 | 1884 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1885 | sizeof(struct fuse_inode), 0, |
1886 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1887 | fuse_inode_init_once); | |
d6392f87 MS |
1888 | err = -ENOMEM; |
1889 | if (!fuse_inode_cachep) | |
988f0325 AV |
1890 | goto out; |
1891 | ||
1892 | err = register_fuseblk(); | |
1893 | if (err) | |
1894 | goto out2; | |
1895 | ||
1896 | err = register_filesystem(&fuse_fs_type); | |
1897 | if (err) | |
1898 | goto out3; | |
d6392f87 MS |
1899 | |
1900 | return 0; | |
d8a5ba45 | 1901 | |
988f0325 | 1902 | out3: |
875d95ec | 1903 | unregister_fuseblk(); |
988f0325 AV |
1904 | out2: |
1905 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1906 | out: |
d8a5ba45 MS |
1907 | return err; |
1908 | } | |
1909 | ||
1910 | static void fuse_fs_cleanup(void) | |
1911 | { | |
1912 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1913 | unregister_fuseblk(); |
8c0a8537 KS |
1914 | |
1915 | /* | |
1916 | * Make sure all delayed rcu free inodes are flushed before we | |
1917 | * destroy cache. | |
1918 | */ | |
1919 | rcu_barrier(); | |
d8a5ba45 MS |
1920 | kmem_cache_destroy(fuse_inode_cachep); |
1921 | } | |
1922 | ||
5c89e17e | 1923 | static struct kobject *fuse_kobj; |
5c89e17e | 1924 | |
f543f253 MS |
1925 | static int fuse_sysfs_init(void) |
1926 | { | |
1927 | int err; | |
1928 | ||
00d26666 | 1929 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1930 | if (!fuse_kobj) { |
1931 | err = -ENOMEM; | |
f543f253 | 1932 | goto out_err; |
5c89e17e | 1933 | } |
f543f253 | 1934 | |
f9bb4882 EB |
1935 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1936 | if (err) | |
f543f253 MS |
1937 | goto out_fuse_unregister; |
1938 | ||
1939 | return 0; | |
1940 | ||
1941 | out_fuse_unregister: | |
197b12d6 | 1942 | kobject_put(fuse_kobj); |
f543f253 MS |
1943 | out_err: |
1944 | return err; | |
1945 | } | |
1946 | ||
1947 | static void fuse_sysfs_cleanup(void) | |
1948 | { | |
f9bb4882 | 1949 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1950 | kobject_put(fuse_kobj); |
f543f253 MS |
1951 | } |
1952 | ||
d8a5ba45 MS |
1953 | static int __init fuse_init(void) |
1954 | { | |
1955 | int res; | |
1956 | ||
f2294482 KS |
1957 | pr_info("init (API version %i.%i)\n", |
1958 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1959 | |
bafa9654 | 1960 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1961 | res = fuse_fs_init(); |
1962 | if (res) | |
1963 | goto err; | |
1964 | ||
334f485d MS |
1965 | res = fuse_dev_init(); |
1966 | if (res) | |
1967 | goto err_fs_cleanup; | |
1968 | ||
f543f253 MS |
1969 | res = fuse_sysfs_init(); |
1970 | if (res) | |
1971 | goto err_dev_cleanup; | |
1972 | ||
bafa9654 MS |
1973 | res = fuse_ctl_init(); |
1974 | if (res) | |
1975 | goto err_sysfs_cleanup; | |
1976 | ||
487ea5af CH |
1977 | sanitize_global_limit(&max_user_bgreq); |
1978 | sanitize_global_limit(&max_user_congthresh); | |
1979 | ||
d8a5ba45 MS |
1980 | return 0; |
1981 | ||
bafa9654 MS |
1982 | err_sysfs_cleanup: |
1983 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1984 | err_dev_cleanup: |
1985 | fuse_dev_cleanup(); | |
334f485d MS |
1986 | err_fs_cleanup: |
1987 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1988 | err: |
1989 | return res; | |
1990 | } | |
1991 | ||
1992 | static void __exit fuse_exit(void) | |
1993 | { | |
f2294482 | 1994 | pr_debug("exit\n"); |
d8a5ba45 | 1995 | |
bafa9654 | 1996 | fuse_ctl_cleanup(); |
f543f253 | 1997 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1998 | fuse_fs_cleanup(); |
334f485d | 1999 | fuse_dev_cleanup(); |
d8a5ba45 MS |
2000 | } |
2001 | ||
2002 | module_init(fuse_init); | |
2003 | module_exit(fuse_exit); |