Commit | Line | Data |
---|---|---|
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> |
d8a5ba45 MS |
26 | |
27 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
28 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
e18b890b | 31 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
32 | struct list_head fuse_conn_list; |
33 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 34 | |
e4dca7b7 | 35 | static int set_global_limit(const char *val, const struct kernel_param *kp); |
487ea5af | 36 | |
79a9d994 | 37 | unsigned max_user_bgreq; |
487ea5af CH |
38 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
39 | &max_user_bgreq, 0644); | |
40 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
41 | MODULE_PARM_DESC(max_user_bgreq, | |
42 | "Global limit for the maximum number of backgrounded requests an " | |
43 | "unprivileged user can set"); | |
44 | ||
79a9d994 | 45 | unsigned max_user_congthresh; |
487ea5af CH |
46 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
47 | &max_user_congthresh, 0644); | |
48 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
49 | MODULE_PARM_DESC(max_user_congthresh, | |
50 | "Global limit for the maximum congestion threshold an " | |
51 | "unprivileged user can set"); | |
52 | ||
d8a5ba45 MS |
53 | #define FUSE_SUPER_MAGIC 0x65735546 |
54 | ||
d1875dba MS |
55 | #define FUSE_DEFAULT_BLKSIZE 512 |
56 | ||
7a6d3c8b CH |
57 | /** Maximum number of outstanding background requests */ |
58 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
59 | ||
60 | /** Congestion starts at 75% of maximum */ | |
61 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
62 | ||
c30da2e9 DH |
63 | #ifdef CONFIG_BLOCK |
64 | static struct file_system_type fuseblk_fs_type; | |
65 | #endif | |
66 | ||
a2daff68 | 67 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca | 68 | { |
dc69e98c | 69 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL_ACCOUNT); |
07e77dca MS |
70 | } |
71 | ||
d8a5ba45 MS |
72 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
73 | { | |
d8a5ba45 MS |
74 | struct fuse_inode *fi; |
75 | ||
9031a69c | 76 | fi = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
77 | if (!fi) | |
d8a5ba45 MS |
78 | return NULL; |
79 | ||
0a0898cf | 80 | fi->i_time = 0; |
2f1e8196 | 81 | fi->inval_mask = 0; |
d8a5ba45 | 82 | fi->nodeid = 0; |
9e6268db | 83 | fi->nlookup = 0; |
fbee36b9 | 84 | fi->attr_version = 0; |
45c72cd7 | 85 | fi->orig_ino = 0; |
4582a4ab | 86 | fi->state = 0; |
5c672ab3 | 87 | mutex_init(&fi->mutex); |
f15ecfef | 88 | spin_lock_init(&fi->lock); |
07e77dca | 89 | fi->forget = fuse_alloc_forget(); |
c2d0ad00 VG |
90 | if (!fi->forget) |
91 | goto out_free; | |
92 | ||
93 | if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi)) | |
94 | goto out_free_forget; | |
d8a5ba45 | 95 | |
9031a69c | 96 | return &fi->inode; |
c2d0ad00 VG |
97 | |
98 | out_free_forget: | |
99 | kfree(fi->forget); | |
100 | out_free: | |
101 | kmem_cache_free(fuse_inode_cachep, fi); | |
102 | return NULL; | |
d8a5ba45 MS |
103 | } |
104 | ||
9baf28bb | 105 | static void fuse_free_inode(struct inode *inode) |
d8a5ba45 | 106 | { |
e5e5558e | 107 | struct fuse_inode *fi = get_fuse_inode(inode); |
9baf28bb | 108 | |
5c672ab3 | 109 | mutex_destroy(&fi->mutex); |
07e77dca | 110 | kfree(fi->forget); |
c2d0ad00 VG |
111 | #ifdef CONFIG_FUSE_DAX |
112 | kfree(fi->dax); | |
113 | #endif | |
9baf28bb | 114 | kmem_cache_free(fuse_inode_cachep, fi); |
d8a5ba45 MS |
115 | } |
116 | ||
b57922d9 | 117 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 118 | { |
9baf28bb AV |
119 | struct fuse_inode *fi = get_fuse_inode(inode); |
120 | ||
5c791fe1 MS |
121 | /* Will write inode on close/munmap and in all other dirtiers */ |
122 | WARN_ON(inode->i_state & I_DIRTY_INODE); | |
123 | ||
91b0abe3 | 124 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 125 | clear_inode(inode); |
1751e8a6 | 126 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 127 | struct fuse_conn *fc = get_fuse_conn(inode); |
c2d0ad00 VG |
128 | |
129 | if (FUSE_IS_DAX(inode)) | |
130 | fuse_dax_inode_cleanup(inode); | |
1866d779 MR |
131 | if (fi->nlookup) { |
132 | fuse_queue_forget(fc, fi->forget, fi->nodeid, | |
133 | fi->nlookup); | |
134 | fi->forget = NULL; | |
135 | } | |
e5e5558e | 136 | } |
5d069dbe | 137 | if (S_ISREG(inode->i_mode) && !fuse_is_bad(inode)) { |
9baf28bb AV |
138 | WARN_ON(!list_empty(&fi->write_files)); |
139 | WARN_ON(!list_empty(&fi->queued_writes)); | |
140 | } | |
d8a5ba45 MS |
141 | } |
142 | ||
84c21507 | 143 | static int fuse_reconfigure(struct fs_context *fsc) |
71421259 | 144 | { |
84c21507 | 145 | struct super_block *sb = fsc->root->d_sb; |
0189a2d3 | 146 | |
02b9984d | 147 | sync_filesystem(sb); |
84c21507 | 148 | if (fsc->sb_flags & SB_MANDLOCK) |
71421259 MS |
149 | return -EINVAL; |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
45c72cd7 PS |
154 | /* |
155 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
156 | * so that it will fit. | |
157 | */ | |
158 | static ino_t fuse_squash_ino(u64 ino64) | |
159 | { | |
160 | ino_t ino = (ino_t) ino64; | |
161 | if (sizeof(ino_t) < sizeof(u64)) | |
162 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
163 | return ino; | |
164 | } | |
165 | ||
3be5a52b | 166 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
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; |
2f1e8196 | 176 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 177 | |
45c72cd7 | 178 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 179 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 180 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
181 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
182 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 MS |
183 | inode->i_blocks = attr->blocks; |
184 | inode->i_atime.tv_sec = attr->atime; | |
185 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 | 186 | /* mtime from server may be stale due to local buffered write */ |
4b52f059 | 187 | if (!(cache_mask & STATX_MTIME)) { |
b0aa7606 MP |
188 | inode->i_mtime.tv_sec = attr->mtime; |
189 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
4b52f059 MS |
190 | } |
191 | if (!(cache_mask & STATX_CTIME)) { | |
31f3267b MP |
192 | inode->i_ctime.tv_sec = attr->ctime; |
193 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 194 | } |
e00d2c2d | 195 | |
0e9663ee MS |
196 | if (attr->blksize != 0) |
197 | inode->i_blkbits = ilog2(attr->blksize); | |
198 | else | |
199 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
200 | ||
ebc14c4d MS |
201 | /* |
202 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
203 | * to check permissions. This prevents failures due to the | |
204 | * check in may_delete(). | |
205 | */ | |
206 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 207 | if (!fc->default_permissions) |
ebc14c4d | 208 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
209 | |
210 | fi->orig_ino = attr->ino; | |
9d769e6a VG |
211 | |
212 | /* | |
213 | * We are refreshing inode data and it is possible that another | |
214 | * client set suid/sgid or security.capability xattr. So clear | |
215 | * S_NOSEC. Ideally, we could have cleared it only if suid/sgid | |
216 | * was set or if security.capability xattr was set. But we don't | |
217 | * know if security.capability has been set or not. So clear it | |
218 | * anyway. Its less efficient but should be safe. | |
219 | */ | |
220 | inode->i_flags &= ~S_NOSEC; | |
3be5a52b MS |
221 | } |
222 | ||
4b52f059 MS |
223 | u32 fuse_get_cache_mask(struct inode *inode) |
224 | { | |
225 | struct fuse_conn *fc = get_fuse_conn(inode); | |
226 | ||
227 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) | |
228 | return 0; | |
229 | ||
230 | return STATX_MTIME | STATX_CTIME | STATX_SIZE; | |
231 | } | |
232 | ||
3be5a52b MS |
233 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
234 | u64 attr_valid, u64 attr_version) | |
235 | { | |
236 | struct fuse_conn *fc = get_fuse_conn(inode); | |
237 | struct fuse_inode *fi = get_fuse_inode(inode); | |
4b52f059 | 238 | u32 cache_mask; |
3be5a52b | 239 | loff_t oldsize; |
a64ba10f | 240 | struct timespec64 old_mtime; |
3be5a52b | 241 | |
f15ecfef | 242 | spin_lock(&fi->lock); |
04d82db0 MS |
243 | /* |
244 | * In case of writeback_cache enabled, writes update mtime, ctime and | |
245 | * may update i_size. In these cases trust the cached value in the | |
246 | * inode. | |
247 | */ | |
4b52f059 MS |
248 | cache_mask = fuse_get_cache_mask(inode); |
249 | if (cache_mask & STATX_SIZE) | |
04d82db0 | 250 | attr->size = i_size_read(inode); |
4b52f059 MS |
251 | |
252 | if (cache_mask & STATX_MTIME) { | |
04d82db0 MS |
253 | attr->mtime = inode->i_mtime.tv_sec; |
254 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
4b52f059 MS |
255 | } |
256 | if (cache_mask & STATX_CTIME) { | |
04d82db0 MS |
257 | attr->ctime = inode->i_ctime.tv_sec; |
258 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
259 | } | |
260 | ||
06a7c3c2 MP |
261 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
262 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 263 | spin_unlock(&fi->lock); |
3be5a52b MS |
264 | return; |
265 | } | |
266 | ||
a64ba10f | 267 | old_mtime = inode->i_mtime; |
4b52f059 | 268 | fuse_change_attributes_common(inode, attr, attr_valid, cache_mask); |
ebc14c4d | 269 | |
e00d2c2d | 270 | oldsize = inode->i_size; |
8373200b PE |
271 | /* |
272 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
273 | * extend local i_size without keeping userspace server in sync. So, | |
274 | * attr->size coming from server can be stale. We cannot trust it. | |
275 | */ | |
4b52f059 | 276 | if (!(cache_mask & STATX_SIZE)) |
8373200b | 277 | i_size_write(inode, attr->size); |
f15ecfef | 278 | spin_unlock(&fi->lock); |
e00d2c2d | 279 | |
4b52f059 | 280 | if (!cache_mask && S_ISREG(inode->i_mode)) { |
eed2179e BF |
281 | bool inval = false; |
282 | ||
283 | if (oldsize != attr->size) { | |
7caef267 | 284 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
285 | if (!fc->explicit_inval_data) |
286 | inval = true; | |
eed2179e | 287 | } else if (fc->auto_inval_data) { |
a64ba10f | 288 | struct timespec64 new_mtime = { |
eed2179e BF |
289 | .tv_sec = attr->mtime, |
290 | .tv_nsec = attr->mtimensec, | |
291 | }; | |
292 | ||
293 | /* | |
294 | * Auto inval mode also checks and invalidates if mtime | |
295 | * has changed. | |
296 | */ | |
a64ba10f | 297 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
298 | inval = true; |
299 | } | |
300 | ||
301 | if (inval) | |
302 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 303 | } |
d8a5ba45 MS |
304 | } |
305 | ||
306 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
307 | { | |
308 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 309 | inode->i_size = attr->size; |
b0aa7606 MP |
310 | inode->i_mtime.tv_sec = attr->mtime; |
311 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
312 | inode->i_ctime.tv_sec = attr->ctime; |
313 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
314 | if (S_ISREG(inode->i_mode)) { |
315 | fuse_init_common(inode); | |
93a497b9 | 316 | fuse_init_file_inode(inode, attr->flags); |
e5e5558e MS |
317 | } else if (S_ISDIR(inode->i_mode)) |
318 | fuse_init_dir(inode); | |
319 | else if (S_ISLNK(inode->i_mode)) | |
320 | fuse_init_symlink(inode); | |
321 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
322 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
323 | fuse_init_common(inode); | |
324 | init_special_inode(inode, inode->i_mode, | |
325 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
326 | } else |
327 | BUG(); | |
d8a5ba45 MS |
328 | } |
329 | ||
fcee216b | 330 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 331 | { |
b48badf0 | 332 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
333 | if (get_node_id(inode) == nodeid) |
334 | return 1; | |
335 | else | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
340 | { | |
b48badf0 | 341 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
342 | get_fuse_inode(inode)->nodeid = nodeid; |
343 | return 0; | |
344 | } | |
345 | ||
b48badf0 | 346 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
347 | int generation, struct fuse_attr *attr, |
348 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
349 | { |
350 | struct inode *inode; | |
9e6268db | 351 | struct fuse_inode *fi; |
d8a5ba45 | 352 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 | 353 | |
bf109c64 MR |
354 | /* |
355 | * Auto mount points get their node id from the submount root, which is | |
356 | * not a unique identifier within this filesystem. | |
357 | * | |
358 | * To avoid conflicts, do not place submount points into the inode hash | |
359 | * table. | |
360 | */ | |
361 | if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) && | |
362 | S_ISDIR(attr->mode)) { | |
363 | inode = new_inode(sb); | |
364 | if (!inode) | |
365 | return NULL; | |
366 | ||
367 | fuse_init_inode(inode, attr); | |
368 | get_fuse_inode(inode)->nodeid = nodeid; | |
369 | inode->i_flags |= S_AUTOMOUNT; | |
370 | goto done; | |
371 | } | |
372 | ||
373 | retry: | |
d8a5ba45 MS |
374 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
375 | if (!inode) | |
376 | return NULL; | |
377 | ||
378 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 379 | inode->i_flags |= S_NOATIME; |
d31433c8 | 380 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 381 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 382 | inode->i_generation = generation; |
d8a5ba45 MS |
383 | fuse_init_inode(inode, attr); |
384 | unlock_new_inode(inode); | |
15db1683 AG |
385 | } else if (fuse_stale_inode(inode, generation, attr)) { |
386 | /* nodeid was reused, any I/O on the old inode should fail */ | |
5d069dbe | 387 | fuse_make_bad(inode); |
d8a5ba45 | 388 | iput(inode); |
d8a5ba45 MS |
389 | goto retry; |
390 | } | |
bf109c64 | 391 | done: |
9e6268db | 392 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 393 | spin_lock(&fi->lock); |
1729a16c | 394 | fi->nlookup++; |
c9d8f5f0 | 395 | spin_unlock(&fi->lock); |
1fb69e78 MS |
396 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
397 | ||
d8a5ba45 MS |
398 | return inode; |
399 | } | |
400 | ||
fcee216b MR |
401 | struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid, |
402 | struct fuse_mount **fm) | |
403 | { | |
404 | struct fuse_mount *fm_iter; | |
405 | struct inode *inode; | |
406 | ||
407 | WARN_ON(!rwsem_is_locked(&fc->killsb)); | |
408 | list_for_each_entry(fm_iter, &fc->mounts, fc_entry) { | |
409 | if (!fm_iter->sb) | |
410 | continue; | |
411 | ||
412 | inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid); | |
413 | if (inode) { | |
414 | if (fm) | |
415 | *fm = fm_iter; | |
416 | return inode; | |
417 | } | |
418 | } | |
419 | ||
420 | return NULL; | |
421 | } | |
422 | ||
423 | int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid, | |
3b463ae0 JM |
424 | loff_t offset, loff_t len) |
425 | { | |
5ddd9ced | 426 | struct fuse_inode *fi; |
3b463ae0 JM |
427 | struct inode *inode; |
428 | pgoff_t pg_start; | |
429 | pgoff_t pg_end; | |
430 | ||
fcee216b | 431 | inode = fuse_ilookup(fc, nodeid, NULL); |
3b463ae0 JM |
432 | if (!inode) |
433 | return -ENOENT; | |
434 | ||
5ddd9ced MS |
435 | fi = get_fuse_inode(inode); |
436 | spin_lock(&fi->lock); | |
437 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
438 | spin_unlock(&fi->lock); | |
439 | ||
3b463ae0 | 440 | fuse_invalidate_attr(inode); |
60bcc88a | 441 | forget_all_cached_acls(inode); |
3b463ae0 | 442 | if (offset >= 0) { |
09cbfeaf | 443 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
444 | if (len <= 0) |
445 | pg_end = -1; | |
446 | else | |
09cbfeaf | 447 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
448 | invalidate_inode_pages2_range(inode->i_mapping, |
449 | pg_start, pg_end); | |
450 | } | |
451 | iput(inode); | |
452 | return 0; | |
453 | } | |
454 | ||
63576c13 | 455 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 456 | { |
63576c13 MS |
457 | bool locked = false; |
458 | ||
459 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 460 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
461 | locked = true; |
462 | } | |
463 | ||
464 | return locked; | |
5c672ab3 MS |
465 | } |
466 | ||
63576c13 | 467 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 468 | { |
63576c13 | 469 | if (locked) |
5c672ab3 MS |
470 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
471 | } | |
472 | ||
42faad99 | 473 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 474 | { |
15c8e72e VG |
475 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
476 | ||
477 | if (!fc->no_force_umount) | |
478 | fuse_abort_conn(fc); | |
69a53bf2 MS |
479 | } |
480 | ||
fcee216b | 481 | static void fuse_send_destroy(struct fuse_mount *fm) |
0ec7ca41 | 482 | { |
fcee216b | 483 | if (fm->fc->conn_init) { |
1ccd1ea2 MS |
484 | FUSE_ARGS(args); |
485 | ||
486 | args.opcode = FUSE_DESTROY; | |
487 | args.force = true; | |
488 | args.nocreds = true; | |
fcee216b | 489 | fuse_simple_request(fm, &args); |
0ec7ca41 MS |
490 | } |
491 | } | |
492 | ||
e5e5558e MS |
493 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
494 | { | |
495 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
496 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 497 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
498 | stbuf->f_blocks = attr->blocks; |
499 | stbuf->f_bfree = attr->bfree; | |
500 | stbuf->f_bavail = attr->bavail; | |
501 | stbuf->f_files = attr->files; | |
502 | stbuf->f_ffree = attr->ffree; | |
503 | stbuf->f_namelen = attr->namelen; | |
504 | /* fsid is left zero */ | |
505 | } | |
506 | ||
726c3342 | 507 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 508 | { |
726c3342 | 509 | struct super_block *sb = dentry->d_sb; |
fcee216b | 510 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 511 | FUSE_ARGS(args); |
e5e5558e MS |
512 | struct fuse_statfs_out outarg; |
513 | int err; | |
514 | ||
fcee216b | 515 | if (!fuse_allow_current_process(fm->fc)) { |
e57ac683 MS |
516 | buf->f_type = FUSE_SUPER_MAGIC; |
517 | return 0; | |
518 | } | |
519 | ||
de5f1202 | 520 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
521 | args.in_numargs = 0; |
522 | args.opcode = FUSE_STATFS; | |
523 | args.nodeid = get_node_id(d_inode(dentry)); | |
524 | args.out_numargs = 1; | |
525 | args.out_args[0].size = sizeof(outarg); | |
526 | args.out_args[0].value = &outarg; | |
fcee216b | 527 | err = fuse_simple_request(fm, &args); |
e5e5558e MS |
528 | if (!err) |
529 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
530 | return err; |
531 | } | |
532 | ||
660585b5 MS |
533 | static struct fuse_sync_bucket *fuse_sync_bucket_alloc(void) |
534 | { | |
535 | struct fuse_sync_bucket *bucket; | |
536 | ||
537 | bucket = kzalloc(sizeof(*bucket), GFP_KERNEL | __GFP_NOFAIL); | |
538 | if (bucket) { | |
539 | init_waitqueue_head(&bucket->waitq); | |
540 | /* Initial active count */ | |
541 | atomic_set(&bucket->count, 1); | |
542 | } | |
543 | return bucket; | |
544 | } | |
545 | ||
546 | static void fuse_sync_fs_writes(struct fuse_conn *fc) | |
547 | { | |
548 | struct fuse_sync_bucket *bucket, *new_bucket; | |
549 | int count; | |
550 | ||
551 | new_bucket = fuse_sync_bucket_alloc(); | |
552 | spin_lock(&fc->lock); | |
553 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); | |
554 | count = atomic_read(&bucket->count); | |
555 | WARN_ON(count < 1); | |
556 | /* No outstanding writes? */ | |
557 | if (count == 1) { | |
558 | spin_unlock(&fc->lock); | |
559 | kfree(new_bucket); | |
560 | return; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Completion of new bucket depends on completion of this bucket, so add | |
565 | * one more count. | |
566 | */ | |
567 | atomic_inc(&new_bucket->count); | |
568 | rcu_assign_pointer(fc->curr_bucket, new_bucket); | |
569 | spin_unlock(&fc->lock); | |
570 | /* | |
571 | * Drop initial active count. At this point if all writes in this and | |
572 | * ancestor buckets complete, the count will go to zero and this task | |
573 | * will be woken up. | |
574 | */ | |
575 | atomic_dec(&bucket->count); | |
576 | ||
577 | wait_event(bucket->waitq, atomic_read(&bucket->count) == 0); | |
578 | ||
579 | /* Drop temp count on descendant bucket */ | |
580 | fuse_sync_bucket_dec(new_bucket); | |
581 | kfree_rcu(bucket, rcu); | |
582 | } | |
583 | ||
2d82ab25 GK |
584 | static int fuse_sync_fs(struct super_block *sb, int wait) |
585 | { | |
586 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
587 | struct fuse_conn *fc = fm->fc; | |
588 | struct fuse_syncfs_in inarg; | |
589 | FUSE_ARGS(args); | |
590 | int err; | |
591 | ||
592 | /* | |
593 | * Userspace cannot handle the wait == 0 case. Avoid a | |
594 | * gratuitous roundtrip. | |
595 | */ | |
596 | if (!wait) | |
597 | return 0; | |
598 | ||
599 | /* The filesystem is being unmounted. Nothing to do. */ | |
600 | if (!sb->s_root) | |
601 | return 0; | |
602 | ||
603 | if (!fc->sync_fs) | |
604 | return 0; | |
605 | ||
660585b5 MS |
606 | fuse_sync_fs_writes(fc); |
607 | ||
2d82ab25 GK |
608 | memset(&inarg, 0, sizeof(inarg)); |
609 | args.in_numargs = 1; | |
610 | args.in_args[0].size = sizeof(inarg); | |
611 | args.in_args[0].value = &inarg; | |
612 | args.opcode = FUSE_SYNCFS; | |
613 | args.nodeid = get_node_id(sb->s_root->d_inode); | |
614 | args.out_numargs = 0; | |
615 | ||
616 | err = fuse_simple_request(fm, &args); | |
617 | if (err == -ENOSYS) { | |
618 | fc->sync_fs = 0; | |
619 | err = 0; | |
620 | } | |
621 | ||
622 | return err; | |
623 | } | |
624 | ||
d8a5ba45 | 625 | enum { |
c30da2e9 DH |
626 | OPT_SOURCE, |
627 | OPT_SUBTYPE, | |
d8a5ba45 MS |
628 | OPT_FD, |
629 | OPT_ROOTMODE, | |
630 | OPT_USER_ID, | |
87729a55 | 631 | OPT_GROUP_ID, |
d8a5ba45 MS |
632 | OPT_DEFAULT_PERMISSIONS, |
633 | OPT_ALLOW_OTHER, | |
db50b96c | 634 | OPT_MAX_READ, |
d8091614 | 635 | OPT_BLKSIZE, |
d8a5ba45 MS |
636 | OPT_ERR |
637 | }; | |
638 | ||
d7167b14 | 639 | static const struct fs_parameter_spec fuse_fs_parameters[] = { |
c30da2e9 DH |
640 | fsparam_string ("source", OPT_SOURCE), |
641 | fsparam_u32 ("fd", OPT_FD), | |
642 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
643 | fsparam_u32 ("user_id", OPT_USER_ID), | |
644 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
645 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
646 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
647 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
648 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 649 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
650 | {} |
651 | }; | |
652 | ||
84c21507 | 653 | static int fuse_parse_param(struct fs_context *fsc, struct fs_parameter *param) |
233a01fa | 654 | { |
c30da2e9 | 655 | struct fs_parse_result result; |
84c21507 | 656 | struct fuse_fs_context *ctx = fsc->fs_private; |
c30da2e9 DH |
657 | int opt; |
658 | ||
84c21507 | 659 | if (fsc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { |
b330966f MS |
660 | /* |
661 | * Ignore options coming from mount(MS_REMOUNT) for backward | |
662 | * compatibility. | |
663 | */ | |
84c21507 | 664 | if (fsc->oldapi) |
b330966f MS |
665 | return 0; |
666 | ||
84c21507 | 667 | return invalfc(fsc, "No changes allowed in reconfigure"); |
b330966f | 668 | } |
e8b20a47 | 669 | |
84c21507 | 670 | opt = fs_parse(fsc, fuse_fs_parameters, param, &result); |
c30da2e9 DH |
671 | if (opt < 0) |
672 | return opt; | |
673 | ||
674 | switch (opt) { | |
675 | case OPT_SOURCE: | |
84c21507 MS |
676 | if (fsc->source) |
677 | return invalfc(fsc, "Multiple sources specified"); | |
678 | fsc->source = param->string; | |
c30da2e9 DH |
679 | param->string = NULL; |
680 | break; | |
681 | ||
682 | case OPT_SUBTYPE: | |
683 | if (ctx->subtype) | |
84c21507 | 684 | return invalfc(fsc, "Multiple subtypes specified"); |
c30da2e9 DH |
685 | ctx->subtype = param->string; |
686 | param->string = NULL; | |
687 | return 0; | |
688 | ||
689 | case OPT_FD: | |
690 | ctx->fd = result.uint_32; | |
cabdb4fa | 691 | ctx->fd_present = true; |
c30da2e9 DH |
692 | break; |
693 | ||
694 | case OPT_ROOTMODE: | |
695 | if (!fuse_valid_type(result.uint_32)) | |
84c21507 | 696 | return invalfc(fsc, "Invalid rootmode"); |
c30da2e9 | 697 | ctx->rootmode = result.uint_32; |
cabdb4fa | 698 | ctx->rootmode_present = true; |
c30da2e9 DH |
699 | break; |
700 | ||
701 | case OPT_USER_ID: | |
84c21507 | 702 | ctx->user_id = make_kuid(fsc->user_ns, result.uint_32); |
c30da2e9 | 703 | if (!uid_valid(ctx->user_id)) |
84c21507 | 704 | return invalfc(fsc, "Invalid user_id"); |
cabdb4fa | 705 | ctx->user_id_present = true; |
c30da2e9 DH |
706 | break; |
707 | ||
708 | case OPT_GROUP_ID: | |
84c21507 | 709 | ctx->group_id = make_kgid(fsc->user_ns, result.uint_32); |
c30da2e9 | 710 | if (!gid_valid(ctx->group_id)) |
84c21507 | 711 | return invalfc(fsc, "Invalid group_id"); |
cabdb4fa | 712 | ctx->group_id_present = true; |
c30da2e9 DH |
713 | break; |
714 | ||
715 | case OPT_DEFAULT_PERMISSIONS: | |
cabdb4fa | 716 | ctx->default_permissions = true; |
c30da2e9 DH |
717 | break; |
718 | ||
719 | case OPT_ALLOW_OTHER: | |
cabdb4fa | 720 | ctx->allow_other = true; |
c30da2e9 DH |
721 | break; |
722 | ||
723 | case OPT_MAX_READ: | |
724 | ctx->max_read = result.uint_32; | |
725 | break; | |
726 | ||
727 | case OPT_BLKSIZE: | |
728 | if (!ctx->is_bdev) | |
84c21507 | 729 | return invalfc(fsc, "blksize only supported for fuseblk"); |
c30da2e9 DH |
730 | ctx->blksize = result.uint_32; |
731 | break; | |
732 | ||
733 | default: | |
734 | return -EINVAL; | |
233a01fa | 735 | } |
c30da2e9 DH |
736 | |
737 | return 0; | |
233a01fa MS |
738 | } |
739 | ||
84c21507 | 740 | static void fuse_free_fsc(struct fs_context *fsc) |
d8a5ba45 | 741 | { |
84c21507 | 742 | struct fuse_fs_context *ctx = fsc->fs_private; |
5a533682 | 743 | |
c30da2e9 DH |
744 | if (ctx) { |
745 | kfree(ctx->subtype); | |
746 | kfree(ctx); | |
747 | } | |
d8a5ba45 MS |
748 | } |
749 | ||
34c80b1d | 750 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 751 | { |
34c80b1d AV |
752 | struct super_block *sb = root->d_sb; |
753 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 754 | |
f4fd4ae3 VG |
755 | if (fc->legacy_opts_show) { |
756 | seq_printf(m, ",user_id=%u", | |
757 | from_kuid_munged(fc->user_ns, fc->user_id)); | |
758 | seq_printf(m, ",group_id=%u", | |
759 | from_kgid_munged(fc->user_ns, fc->group_id)); | |
760 | if (fc->default_permissions) | |
761 | seq_puts(m, ",default_permissions"); | |
762 | if (fc->allow_other) | |
763 | seq_puts(m, ",allow_other"); | |
764 | if (fc->max_read != ~0) | |
765 | seq_printf(m, ",max_read=%u", fc->max_read); | |
766 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
767 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
768 | } | |
1dd53957 | 769 | #ifdef CONFIG_FUSE_DAX |
780b1b95 JX |
770 | if (fc->dax_mode == FUSE_DAX_ALWAYS) |
771 | seq_puts(m, ",dax=always"); | |
772 | else if (fc->dax_mode == FUSE_DAX_NEVER) | |
773 | seq_puts(m, ",dax=never"); | |
774 | else if (fc->dax_mode == FUSE_DAX_INODE_USER) | |
775 | seq_puts(m, ",dax=inode"); | |
1dd53957 | 776 | #endif |
3f22c746 | 777 | |
d8a5ba45 MS |
778 | return 0; |
779 | } | |
780 | ||
ae3aad77 SH |
781 | static void fuse_iqueue_init(struct fuse_iqueue *fiq, |
782 | const struct fuse_iqueue_ops *ops, | |
783 | void *priv) | |
f88996a9 MS |
784 | { |
785 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
76e43c8c | 786 | spin_lock_init(&fiq->lock); |
f88996a9 MS |
787 | init_waitqueue_head(&fiq->waitq); |
788 | INIT_LIST_HEAD(&fiq->pending); | |
789 | INIT_LIST_HEAD(&fiq->interrupts); | |
790 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 791 | fiq->connected = 1; |
ae3aad77 SH |
792 | fiq->ops = ops; |
793 | fiq->priv = priv; | |
f88996a9 MS |
794 | } |
795 | ||
3a2b5b9c MS |
796 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
797 | { | |
be2ff42c KT |
798 | unsigned int i; |
799 | ||
45a91cb1 | 800 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
801 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
802 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 803 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 804 | fpq->connected = 1; |
3a2b5b9c MS |
805 | } |
806 | ||
fcee216b MR |
807 | void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm, |
808 | struct user_namespace *user_ns, | |
ae3aad77 | 809 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) |
d8a5ba45 | 810 | { |
0d179aa5 TH |
811 | memset(fc, 0, sizeof(*fc)); |
812 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 813 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 814 | init_rwsem(&fc->killsb); |
095fc40a | 815 | refcount_set(&fc->count, 1); |
c3696046 | 816 | atomic_set(&fc->dev_count, 1); |
0d179aa5 | 817 | init_waitqueue_head(&fc->blocked_waitq); |
ae3aad77 | 818 | fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv); |
0d179aa5 TH |
819 | INIT_LIST_HEAD(&fc->bg_queue); |
820 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 821 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 822 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
823 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
824 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 825 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 826 | fc->polled_files = RB_ROOT; |
0aada884 | 827 | fc->blocked = 0; |
796523fb | 828 | fc->initialized = 0; |
e16714d8 | 829 | fc->connected = 1; |
4510d86f | 830 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 831 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 832 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 833 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 834 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
a7f0d7aa | 835 | fc->max_pages_limit = FUSE_MAX_MAX_PAGES; |
fcee216b MR |
836 | |
837 | INIT_LIST_HEAD(&fc->mounts); | |
838 | list_add(&fm->fc_entry, &fc->mounts); | |
839 | fm->fc = fc; | |
d8a5ba45 | 840 | } |
0d179aa5 | 841 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 842 | |
bafa9654 MS |
843 | void fuse_conn_put(struct fuse_conn *fc) |
844 | { | |
095fc40a | 845 | if (refcount_dec_and_test(&fc->count)) { |
a62a8ef9 | 846 | struct fuse_iqueue *fiq = &fc->iq; |
660585b5 | 847 | struct fuse_sync_bucket *bucket; |
a62a8ef9 | 848 | |
1dd53957 VG |
849 | if (IS_ENABLED(CONFIG_FUSE_DAX)) |
850 | fuse_dax_conn_free(fc); | |
a62a8ef9 SH |
851 | if (fiq->ops->release) |
852 | fiq->ops->release(fiq); | |
0b6e9ea0 | 853 | put_pid_ns(fc->pid_ns); |
8cb08329 | 854 | put_user_ns(fc->user_ns); |
660585b5 MS |
855 | bucket = rcu_dereference_protected(fc->curr_bucket, 1); |
856 | if (bucket) { | |
857 | WARN_ON(atomic_read(&bucket->count) != 1); | |
858 | kfree(bucket); | |
859 | } | |
43901aab | 860 | fc->release(fc); |
d2a85164 | 861 | } |
bafa9654 | 862 | } |
08cbf542 | 863 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
864 | |
865 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
866 | { | |
095fc40a | 867 | refcount_inc(&fc->count); |
bafa9654 MS |
868 | return fc; |
869 | } | |
08cbf542 | 870 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 871 | |
b93f858a | 872 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
873 | { |
874 | struct fuse_attr attr; | |
875 | memset(&attr, 0, sizeof(attr)); | |
876 | ||
877 | attr.mode = mode; | |
878 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 879 | attr.nlink = 1; |
1fb69e78 | 880 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
881 | } |
882 | ||
1729a16c | 883 | struct fuse_inode_handle { |
dbd561d2 MS |
884 | u64 nodeid; |
885 | u32 generation; | |
886 | }; | |
887 | ||
888 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
889 | struct fuse_inode_handle *handle) | |
890 | { | |
33670fa2 | 891 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
892 | struct inode *inode; |
893 | struct dentry *entry; | |
894 | int err = -ESTALE; | |
895 | ||
896 | if (handle->nodeid == 0) | |
897 | goto out_err; | |
898 | ||
899 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
900 | if (!inode) { |
901 | struct fuse_entry_out outarg; | |
13983d06 | 902 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
903 | |
904 | if (!fc->export_support) | |
905 | goto out_err; | |
906 | ||
33670fa2 MS |
907 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
908 | &inode); | |
909 | if (err && err != -ENOENT) | |
910 | goto out_err; | |
911 | if (err || !inode) { | |
912 | err = -ESTALE; | |
913 | goto out_err; | |
914 | } | |
915 | err = -EIO; | |
916 | if (get_node_id(inode) != handle->nodeid) | |
917 | goto out_iput; | |
918 | } | |
dbd561d2 MS |
919 | err = -ESTALE; |
920 | if (inode->i_generation != handle->generation) | |
921 | goto out_iput; | |
922 | ||
44003728 | 923 | entry = d_obtain_alias(inode); |
c35eebe9 | 924 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 925 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
926 | |
927 | return entry; | |
928 | ||
929 | out_iput: | |
930 | iput(inode); | |
931 | out_err: | |
932 | return ERR_PTR(err); | |
933 | } | |
934 | ||
b0b0382b AV |
935 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
936 | struct inode *parent) | |
dbd561d2 | 937 | { |
b0b0382b | 938 | int len = parent ? 6 : 3; |
dbd561d2 MS |
939 | u64 nodeid; |
940 | u32 generation; | |
941 | ||
5fe0c237 AK |
942 | if (*max_len < len) { |
943 | *max_len = len; | |
94e07a75 | 944 | return FILEID_INVALID; |
5fe0c237 | 945 | } |
dbd561d2 MS |
946 | |
947 | nodeid = get_fuse_inode(inode)->nodeid; | |
948 | generation = inode->i_generation; | |
949 | ||
950 | fh[0] = (u32)(nodeid >> 32); | |
951 | fh[1] = (u32)(nodeid & 0xffffffff); | |
952 | fh[2] = generation; | |
953 | ||
b0b0382b | 954 | if (parent) { |
dbd561d2 MS |
955 | nodeid = get_fuse_inode(parent)->nodeid; |
956 | generation = parent->i_generation; | |
dbd561d2 MS |
957 | |
958 | fh[3] = (u32)(nodeid >> 32); | |
959 | fh[4] = (u32)(nodeid & 0xffffffff); | |
960 | fh[5] = generation; | |
961 | } | |
962 | ||
963 | *max_len = len; | |
b0b0382b | 964 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
965 | } |
966 | ||
967 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
968 | struct fid *fid, int fh_len, int fh_type) | |
969 | { | |
970 | struct fuse_inode_handle handle; | |
971 | ||
972 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
973 | return NULL; | |
974 | ||
975 | handle.nodeid = (u64) fid->raw[0] << 32; | |
976 | handle.nodeid |= (u64) fid->raw[1]; | |
977 | handle.generation = fid->raw[2]; | |
978 | return fuse_get_dentry(sb, &handle); | |
979 | } | |
980 | ||
981 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
982 | struct fid *fid, int fh_len, int fh_type) | |
983 | { | |
984 | struct fuse_inode_handle parent; | |
985 | ||
986 | if (fh_type != 0x82 || fh_len < 6) | |
987 | return NULL; | |
988 | ||
989 | parent.nodeid = (u64) fid->raw[3] << 32; | |
990 | parent.nodeid |= (u64) fid->raw[4]; | |
991 | parent.generation = fid->raw[5]; | |
992 | return fuse_get_dentry(sb, &parent); | |
993 | } | |
994 | ||
33670fa2 MS |
995 | static struct dentry *fuse_get_parent(struct dentry *child) |
996 | { | |
2b0143b5 | 997 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
998 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
999 | struct inode *inode; | |
1000 | struct dentry *parent; | |
1001 | struct fuse_entry_out outarg; | |
33670fa2 MS |
1002 | int err; |
1003 | ||
1004 | if (!fc->export_support) | |
1005 | return ERR_PTR(-ESTALE); | |
1006 | ||
33670fa2 | 1007 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
80e5d1ff | 1008 | &dotdot_name, &outarg, &inode); |
44003728 CH |
1009 | if (err) { |
1010 | if (err == -ENOENT) | |
1011 | return ERR_PTR(-ESTALE); | |
33670fa2 | 1012 | return ERR_PTR(err); |
33670fa2 | 1013 | } |
44003728 CH |
1014 | |
1015 | parent = d_obtain_alias(inode); | |
c35eebe9 | 1016 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 1017 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
1018 | |
1019 | return parent; | |
1020 | } | |
dbd561d2 MS |
1021 | |
1022 | static const struct export_operations fuse_export_operations = { | |
1023 | .fh_to_dentry = fuse_fh_to_dentry, | |
1024 | .fh_to_parent = fuse_fh_to_parent, | |
1025 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 1026 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
1027 | }; |
1028 | ||
ee9b6d61 | 1029 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 1030 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 1031 | .free_inode = fuse_free_inode, |
b57922d9 | 1032 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 1033 | .write_inode = fuse_write_inode, |
ead5f0b5 | 1034 | .drop_inode = generic_delete_inode, |
69a53bf2 | 1035 | .umount_begin = fuse_umount_begin, |
e5e5558e | 1036 | .statfs = fuse_statfs, |
2d82ab25 | 1037 | .sync_fs = fuse_sync_fs, |
d8a5ba45 MS |
1038 | .show_options = fuse_show_options, |
1039 | }; | |
1040 | ||
487ea5af CH |
1041 | static void sanitize_global_limit(unsigned *limit) |
1042 | { | |
f22f812d MS |
1043 | /* |
1044 | * The default maximum number of async requests is calculated to consume | |
1045 | * 1/2^13 of the total memory, assuming 392 bytes per request. | |
1046 | */ | |
487ea5af | 1047 | if (*limit == 0) |
f22f812d | 1048 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392; |
487ea5af CH |
1049 | |
1050 | if (*limit >= 1 << 16) | |
1051 | *limit = (1 << 16) - 1; | |
1052 | } | |
1053 | ||
e4dca7b7 | 1054 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
1055 | { |
1056 | int rv; | |
1057 | ||
1058 | rv = param_set_uint(val, kp); | |
1059 | if (rv) | |
1060 | return rv; | |
1061 | ||
1062 | sanitize_global_limit((unsigned *)kp->arg); | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
1068 | { | |
1069 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
1070 | ||
1071 | if (arg->minor < 13) | |
1072 | return; | |
1073 | ||
1074 | sanitize_global_limit(&max_user_bgreq); | |
1075 | sanitize_global_limit(&max_user_congthresh); | |
1076 | ||
ae2dffa3 | 1077 | spin_lock(&fc->bg_lock); |
487ea5af CH |
1078 | if (arg->max_background) { |
1079 | fc->max_background = arg->max_background; | |
1080 | ||
1081 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
1082 | fc->max_background = max_user_bgreq; | |
1083 | } | |
1084 | if (arg->congestion_threshold) { | |
1085 | fc->congestion_threshold = arg->congestion_threshold; | |
1086 | ||
1087 | if (!cap_sys_admin && | |
1088 | fc->congestion_threshold > max_user_congthresh) | |
1089 | fc->congestion_threshold = max_user_congthresh; | |
1090 | } | |
ae2dffa3 | 1091 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
1092 | } |
1093 | ||
615047ef MS |
1094 | struct fuse_init_args { |
1095 | struct fuse_args args; | |
1096 | struct fuse_init_in in; | |
1097 | struct fuse_init_out out; | |
1098 | }; | |
1099 | ||
fcee216b | 1100 | static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args, |
615047ef | 1101 | int error) |
9b9a0469 | 1102 | { |
fcee216b | 1103 | struct fuse_conn *fc = fm->fc; |
615047ef MS |
1104 | struct fuse_init_args *ia = container_of(args, typeof(*ia), args); |
1105 | struct fuse_init_out *arg = &ia->out; | |
fd1a1dc6 | 1106 | bool ok = true; |
9b9a0469 | 1107 | |
615047ef | 1108 | if (error || arg->major != FUSE_KERNEL_VERSION) |
fd1a1dc6 | 1109 | ok = false; |
9b9a0469 | 1110 | else { |
9cd68455 MS |
1111 | unsigned long ra_pages; |
1112 | ||
487ea5af CH |
1113 | process_init_limits(fc, arg); |
1114 | ||
9cd68455 | 1115 | if (arg->minor >= 6) { |
53db2893 MS |
1116 | u64 flags = arg->flags | (u64) arg->flags2 << 32; |
1117 | ||
09cbfeaf | 1118 | ra_pages = arg->max_readahead / PAGE_SIZE; |
53db2893 | 1119 | if (flags & FUSE_ASYNC_READ) |
9cd68455 | 1120 | fc->async_read = 1; |
53db2893 | 1121 | if (!(flags & FUSE_POSIX_LOCKS)) |
71421259 | 1122 | fc->no_lock = 1; |
37fb3a30 | 1123 | if (arg->minor >= 17) { |
53db2893 | 1124 | if (!(flags & FUSE_FLOCK_LOCKS)) |
37fb3a30 | 1125 | fc->no_flock = 1; |
24114504 | 1126 | } else { |
53db2893 | 1127 | if (!(flags & FUSE_POSIX_LOCKS)) |
24114504 | 1128 | fc->no_flock = 1; |
37fb3a30 | 1129 | } |
53db2893 | 1130 | if (flags & FUSE_ATOMIC_O_TRUNC) |
6ff958ed | 1131 | fc->atomic_o_trunc = 1; |
33670fa2 MS |
1132 | if (arg->minor >= 9) { |
1133 | /* LOOKUP has dependency on proto version */ | |
53db2893 | 1134 | if (flags & FUSE_EXPORT_SUPPORT) |
33670fa2 MS |
1135 | fc->export_support = 1; |
1136 | } | |
53db2893 | 1137 | if (flags & FUSE_BIG_WRITES) |
78bb6cb9 | 1138 | fc->big_writes = 1; |
53db2893 | 1139 | if (flags & FUSE_DONT_MASK) |
e0a43ddc | 1140 | fc->dont_mask = 1; |
53db2893 | 1141 | if (flags & FUSE_AUTO_INVAL_DATA) |
72d0d248 | 1142 | fc->auto_inval_data = 1; |
53db2893 | 1143 | else if (flags & FUSE_EXPLICIT_INVAL_DATA) |
ad2ba64d | 1144 | fc->explicit_inval_data = 1; |
53db2893 | 1145 | if (flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 1146 | fc->do_readdirplus = 1; |
53db2893 | 1147 | if (flags & FUSE_READDIRPLUS_AUTO) |
28420dad MS |
1148 | fc->readdirplus_auto = 1; |
1149 | } | |
53db2893 | 1150 | if (flags & FUSE_ASYNC_DIO) |
60b9df7a | 1151 | fc->async_dio = 1; |
53db2893 | 1152 | if (flags & FUSE_WRITEBACK_CACHE) |
4d99ff8f | 1153 | fc->writeback_cache = 1; |
53db2893 | 1154 | if (flags & FUSE_PARALLEL_DIROPS) |
5c672ab3 | 1155 | fc->parallel_dirops = 1; |
53db2893 | 1156 | if (flags & FUSE_HANDLE_KILLPRIV) |
5e940c1d | 1157 | fc->handle_killpriv = 1; |
e27c9d38 | 1158 | if (arg->time_gran && arg->time_gran <= 1000000000) |
fcee216b | 1159 | fm->sb->s_time_gran = arg->time_gran; |
53db2893 | 1160 | if ((flags & FUSE_POSIX_ACL)) { |
29433a29 | 1161 | fc->default_permissions = 1; |
60bcc88a | 1162 | fc->posix_acl = 1; |
fcee216b | 1163 | fm->sb->s_xattr = fuse_acl_xattr_handlers; |
60bcc88a | 1164 | } |
53db2893 | 1165 | if (flags & FUSE_CACHE_SYMLINKS) |
5571f1e6 | 1166 | fc->cache_symlinks = 1; |
53db2893 | 1167 | if (flags & FUSE_ABORT_ERROR) |
3b7008b2 | 1168 | fc->abort_err = 1; |
53db2893 | 1169 | if (flags & FUSE_MAX_PAGES) { |
5da784cc | 1170 | fc->max_pages = |
a7f0d7aa | 1171 | min_t(unsigned int, fc->max_pages_limit, |
5da784cc CS |
1172 | max_t(unsigned int, arg->max_pages, 1)); |
1173 | } | |
fd1a1dc6 | 1174 | if (IS_ENABLED(CONFIG_FUSE_DAX) && |
53db2893 | 1175 | flags & FUSE_MAP_ALIGNMENT && |
fd1a1dc6 SH |
1176 | !fuse_dax_check_alignment(fc, arg->map_alignment)) { |
1177 | ok = false; | |
1178 | } | |
53db2893 | 1179 | if (flags & FUSE_HANDLE_KILLPRIV_V2) { |
63f9909f | 1180 | fc->handle_killpriv_v2 = 1; |
9d769e6a VG |
1181 | fm->sb->s_flags |= SB_NOSEC; |
1182 | } | |
53db2893 | 1183 | if (flags & FUSE_SETXATTR_EXT) |
52a4c95f | 1184 | fc->setxattr_ext = 1; |
3e2b6fdb VG |
1185 | if (flags & FUSE_SECURITY_CTX) |
1186 | fc->init_security = 1; | |
71421259 | 1187 | } else { |
09cbfeaf | 1188 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 1189 | fc->no_lock = 1; |
37fb3a30 | 1190 | fc->no_flock = 1; |
71421259 | 1191 | } |
9cd68455 | 1192 | |
fcee216b MR |
1193 | fm->sb->s_bdi->ra_pages = |
1194 | min(fm->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
1195 | fc->minor = arg->minor; |
1196 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 1197 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 1198 | fc->conn_init = 1; |
9b9a0469 | 1199 | } |
615047ef MS |
1200 | kfree(ia); |
1201 | ||
fd1a1dc6 SH |
1202 | if (!ok) { |
1203 | fc->conn_init = 0; | |
1204 | fc->conn_error = 1; | |
1205 | } | |
1206 | ||
9759bd51 | 1207 | fuse_set_initialized(fc); |
08a53cdc | 1208 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
1209 | } |
1210 | ||
fcee216b | 1211 | void fuse_send_init(struct fuse_mount *fm) |
9b9a0469 | 1212 | { |
615047ef | 1213 | struct fuse_init_args *ia; |
53db2893 | 1214 | u64 flags; |
095da6cb | 1215 | |
615047ef MS |
1216 | ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL); |
1217 | ||
1218 | ia->in.major = FUSE_KERNEL_VERSION; | |
1219 | ia->in.minor = FUSE_KERNEL_MINOR_VERSION; | |
fcee216b | 1220 | ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE; |
53db2893 | 1221 | flags = |
615047ef | 1222 | FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 1223 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 1224 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 1225 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 1226 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 1227 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 1228 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 1229 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
63f9909f | 1230 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA | |
3e2b6fdb VG |
1231 | FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT | |
1232 | FUSE_SECURITY_CTX; | |
fd1a1dc6 | 1233 | #ifdef CONFIG_FUSE_DAX |
fcee216b | 1234 | if (fm->fc->dax) |
53db2893 | 1235 | flags |= FUSE_MAP_ALIGNMENT; |
fd1a1dc6 | 1236 | #endif |
bf109c64 | 1237 | if (fm->fc->auto_submounts) |
53db2893 MS |
1238 | flags |= FUSE_SUBMOUNTS; |
1239 | ||
1240 | ia->in.flags = flags; | |
1241 | ia->in.flags2 = flags >> 32; | |
bf109c64 | 1242 | |
615047ef MS |
1243 | ia->args.opcode = FUSE_INIT; |
1244 | ia->args.in_numargs = 1; | |
1245 | ia->args.in_args[0].size = sizeof(ia->in); | |
1246 | ia->args.in_args[0].value = &ia->in; | |
1247 | ia->args.out_numargs = 1; | |
3ad2f3fb | 1248 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
1249 | with interface version < 7.5. Rest of init_out is zeroed |
1250 | by do_get_request(), so a short reply is not a problem */ | |
cabdb4fa | 1251 | ia->args.out_argvar = true; |
615047ef MS |
1252 | ia->args.out_args[0].size = sizeof(ia->out); |
1253 | ia->args.out_args[0].value = &ia->out; | |
1254 | ia->args.force = true; | |
1255 | ia->args.nocreds = true; | |
1256 | ia->args.end = process_init_reply; | |
1257 | ||
fcee216b MR |
1258 | if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0) |
1259 | process_init_reply(fm, &ia->args, -ENOTCONN); | |
9b9a0469 | 1260 | } |
95a84cdb | 1261 | EXPORT_SYMBOL_GPL(fuse_send_init); |
9b9a0469 | 1262 | |
783863d6 | 1263 | void fuse_free_conn(struct fuse_conn *fc) |
43901aab | 1264 | { |
cc080e9e | 1265 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 1266 | kfree_rcu(fc, rcu); |
43901aab | 1267 | } |
783863d6 | 1268 | EXPORT_SYMBOL_GPL(fuse_free_conn); |
43901aab | 1269 | |
a325f9b9 TH |
1270 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1271 | { | |
1272 | int err; | |
5f7f7543 | 1273 | char *suffix = ""; |
a325f9b9 | 1274 | |
69c8ebf8 | 1275 | if (sb->s_bdev) { |
5f7f7543 | 1276 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1277 | /* |
1278 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1279 | * it to our private bdi... | |
1280 | */ | |
1281 | bdi_put(sb->s_bdi); | |
1282 | sb->s_bdi = &noop_backing_dev_info; | |
1283 | } | |
5f7f7543 JK |
1284 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1285 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1286 | if (err) |
1287 | return err; | |
1288 | ||
5f7f7543 | 1289 | /* fuse does it's own writeback accounting */ |
823423ef CH |
1290 | sb->s_bdi->capabilities &= ~BDI_CAP_WRITEBACK_ACCT; |
1291 | sb->s_bdi->capabilities |= BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1292 | |
a325f9b9 TH |
1293 | /* |
1294 | * For a single fuse filesystem use max 1% of dirty + | |
1295 | * writeback threshold. | |
1296 | * | |
1297 | * This gives about 1M of write buffer for memory maps on a | |
1298 | * machine with 1G and 10% dirty_ratio, which should be more | |
1299 | * than enough. | |
1300 | * | |
1301 | * Privileged users can raise it by writing to | |
1302 | * | |
1303 | * /sys/class/bdi/<bdi>/max_ratio | |
1304 | */ | |
5f7f7543 | 1305 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1306 | |
1307 | return 0; | |
1308 | } | |
1309 | ||
0cd1eb9a | 1310 | struct fuse_dev *fuse_dev_alloc(void) |
cc080e9e MS |
1311 | { |
1312 | struct fuse_dev *fud; | |
be2ff42c | 1313 | struct list_head *pq; |
cc080e9e MS |
1314 | |
1315 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1316 | if (!fud) |
1317 | return NULL; | |
cc080e9e | 1318 | |
be2ff42c KT |
1319 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1320 | if (!pq) { | |
1321 | kfree(fud); | |
1322 | return NULL; | |
cc080e9e MS |
1323 | } |
1324 | ||
be2ff42c | 1325 | fud->pq.processing = pq; |
be2ff42c KT |
1326 | fuse_pqueue_init(&fud->pq); |
1327 | ||
0cd1eb9a VG |
1328 | return fud; |
1329 | } | |
1330 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1331 | ||
1332 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc) | |
1333 | { | |
1334 | fud->fc = fuse_conn_get(fc); | |
be2ff42c KT |
1335 | spin_lock(&fc->lock); |
1336 | list_add_tail(&fud->entry, &fc->devices); | |
1337 | spin_unlock(&fc->lock); | |
0cd1eb9a VG |
1338 | } |
1339 | EXPORT_SYMBOL_GPL(fuse_dev_install); | |
be2ff42c | 1340 | |
0cd1eb9a VG |
1341 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc) |
1342 | { | |
1343 | struct fuse_dev *fud; | |
1344 | ||
1345 | fud = fuse_dev_alloc(); | |
1346 | if (!fud) | |
1347 | return NULL; | |
1348 | ||
1349 | fuse_dev_install(fud, fc); | |
cc080e9e MS |
1350 | return fud; |
1351 | } | |
0cd1eb9a | 1352 | EXPORT_SYMBOL_GPL(fuse_dev_alloc_install); |
cc080e9e MS |
1353 | |
1354 | void fuse_dev_free(struct fuse_dev *fud) | |
1355 | { | |
1356 | struct fuse_conn *fc = fud->fc; | |
1357 | ||
1358 | if (fc) { | |
1359 | spin_lock(&fc->lock); | |
1360 | list_del(&fud->entry); | |
1361 | spin_unlock(&fc->lock); | |
1362 | ||
1363 | fuse_conn_put(fc); | |
1364 | } | |
d72f70da | 1365 | kfree(fud->pq.processing); |
cc080e9e MS |
1366 | kfree(fud); |
1367 | } | |
1368 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1369 | ||
1866d779 MR |
1370 | static void fuse_fill_attr_from_inode(struct fuse_attr *attr, |
1371 | const struct fuse_inode *fi) | |
1372 | { | |
1373 | *attr = (struct fuse_attr){ | |
1374 | .ino = fi->inode.i_ino, | |
1375 | .size = fi->inode.i_size, | |
1376 | .blocks = fi->inode.i_blocks, | |
1377 | .atime = fi->inode.i_atime.tv_sec, | |
1378 | .mtime = fi->inode.i_mtime.tv_sec, | |
1379 | .ctime = fi->inode.i_ctime.tv_sec, | |
1380 | .atimensec = fi->inode.i_atime.tv_nsec, | |
1381 | .mtimensec = fi->inode.i_mtime.tv_nsec, | |
1382 | .ctimensec = fi->inode.i_ctime.tv_nsec, | |
1383 | .mode = fi->inode.i_mode, | |
1384 | .nlink = fi->inode.i_nlink, | |
1385 | .uid = fi->inode.i_uid.val, | |
1386 | .gid = fi->inode.i_gid.val, | |
1387 | .rdev = fi->inode.i_rdev, | |
1388 | .blksize = 1u << fi->inode.i_blkbits, | |
1389 | }; | |
1390 | } | |
1391 | ||
1392 | static void fuse_sb_defaults(struct super_block *sb) | |
1393 | { | |
1394 | sb->s_magic = FUSE_SUPER_MAGIC; | |
1395 | sb->s_op = &fuse_super_operations; | |
1396 | sb->s_xattr = fuse_xattr_handlers; | |
1397 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1398 | sb->s_time_gran = 1; | |
1399 | sb->s_export_op = &fuse_export_operations; | |
1400 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; | |
1401 | if (sb->s_user_ns != &init_user_ns) | |
1402 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
1403 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); | |
1404 | ||
1405 | /* | |
1406 | * If we are not in the initial user namespace posix | |
1407 | * acls must be translated. | |
1408 | */ | |
1409 | if (sb->s_user_ns != &init_user_ns) | |
1410 | sb->s_xattr = fuse_no_acl_xattr_handlers; | |
1411 | } | |
1412 | ||
1b539917 GK |
1413 | static int fuse_fill_super_submount(struct super_block *sb, |
1414 | struct fuse_inode *parent_fi) | |
1866d779 MR |
1415 | { |
1416 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
1417 | struct super_block *parent_sb = parent_fi->inode.i_sb; | |
1418 | struct fuse_attr root_attr; | |
1419 | struct inode *root; | |
1420 | ||
1421 | fuse_sb_defaults(sb); | |
1422 | fm->sb = sb; | |
1423 | ||
1424 | WARN_ON(sb->s_bdi != &noop_backing_dev_info); | |
1425 | sb->s_bdi = bdi_get(parent_sb->s_bdi); | |
1426 | ||
1427 | sb->s_xattr = parent_sb->s_xattr; | |
1428 | sb->s_time_gran = parent_sb->s_time_gran; | |
1429 | sb->s_blocksize = parent_sb->s_blocksize; | |
1430 | sb->s_blocksize_bits = parent_sb->s_blocksize_bits; | |
1431 | sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL); | |
1432 | if (parent_sb->s_subtype && !sb->s_subtype) | |
1433 | return -ENOMEM; | |
1434 | ||
1435 | fuse_fill_attr_from_inode(&root_attr, parent_fi); | |
1436 | root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0); | |
1437 | /* | |
1438 | * This inode is just a duplicate, so it is not looked up and | |
1439 | * its nlookup should not be incremented. fuse_iget() does | |
1440 | * that, though, so undo it here. | |
1441 | */ | |
1442 | get_fuse_inode(root)->nlookup--; | |
1443 | sb->s_d_op = &fuse_dentry_operations; | |
1444 | sb->s_root = d_make_root(root); | |
1445 | if (!sb->s_root) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
266eb3f2 | 1451 | /* Filesystem context private data holds the FUSE inode of the mount point */ |
fe0a7bd8 GK |
1452 | static int fuse_get_tree_submount(struct fs_context *fsc) |
1453 | { | |
266eb3f2 GK |
1454 | struct fuse_mount *fm; |
1455 | struct fuse_inode *mp_fi = fsc->fs_private; | |
1456 | struct fuse_conn *fc = get_fuse_conn(&mp_fi->inode); | |
1457 | struct super_block *sb; | |
1458 | int err; | |
1459 | ||
1460 | fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); | |
1461 | if (!fm) | |
1462 | return -ENOMEM; | |
1463 | ||
c191cd07 | 1464 | fm->fc = fuse_conn_get(fc); |
266eb3f2 GK |
1465 | fsc->s_fs_info = fm; |
1466 | sb = sget_fc(fsc, NULL, set_anon_super_fc); | |
c191cd07 MS |
1467 | if (fsc->s_fs_info) |
1468 | fuse_mount_destroy(fm); | |
1469 | if (IS_ERR(sb)) | |
266eb3f2 | 1470 | return PTR_ERR(sb); |
266eb3f2 GK |
1471 | |
1472 | /* Initialize superblock, making @mp_fi its root */ | |
1473 | err = fuse_fill_super_submount(sb, mp_fi); | |
1474 | if (err) { | |
266eb3f2 GK |
1475 | deactivate_locked_super(sb); |
1476 | return err; | |
1477 | } | |
1478 | ||
1479 | down_write(&fc->killsb); | |
1480 | list_add_tail(&fm->fc_entry, &fc->mounts); | |
1481 | up_write(&fc->killsb); | |
1482 | ||
1483 | sb->s_flags |= SB_ACTIVE; | |
1484 | fsc->root = dget(sb->s_root); | |
1485 | ||
fe0a7bd8 GK |
1486 | return 0; |
1487 | } | |
1488 | ||
1489 | static const struct fs_context_operations fuse_context_submount_ops = { | |
1490 | .get_tree = fuse_get_tree_submount, | |
1491 | }; | |
1492 | ||
1493 | int fuse_init_fs_context_submount(struct fs_context *fsc) | |
1494 | { | |
1495 | fsc->ops = &fuse_context_submount_ops; | |
1496 | return 0; | |
1497 | } | |
1498 | EXPORT_SYMBOL_GPL(fuse_init_fs_context_submount); | |
1499 | ||
0cc2656c | 1500 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) |
d8a5ba45 | 1501 | { |
7fd3abfa | 1502 | struct fuse_dev *fud = NULL; |
fcee216b MR |
1503 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1504 | struct fuse_conn *fc = fm->fc; | |
d8a5ba45 | 1505 | struct inode *root; |
f543f253 | 1506 | struct dentry *root_dentry; |
d8a5ba45 MS |
1507 | int err; |
1508 | ||
c2b8f006 | 1509 | err = -EINVAL; |
1751e8a6 | 1510 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1511 | goto err; |
71421259 | 1512 | |
660585b5 | 1513 | rcu_assign_pointer(fc->curr_bucket, fuse_sync_bucket_alloc()); |
1866d779 | 1514 | fuse_sb_defaults(sb); |
9e1f1de0 | 1515 | |
0cc2656c | 1516 | if (ctx->is_bdev) { |
875d95ec | 1517 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1518 | err = -EINVAL; |
c30da2e9 | 1519 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1520 | goto err; |
875d95ec | 1521 | #endif |
d8091614 | 1522 | } else { |
09cbfeaf KS |
1523 | sb->s_blocksize = PAGE_SIZE; |
1524 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1525 | } |
c30da2e9 DH |
1526 | |
1527 | sb->s_subtype = ctx->subtype; | |
1528 | ctx->subtype = NULL; | |
1dd53957 | 1529 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
780b1b95 | 1530 | err = fuse_dax_conn_alloc(fc, ctx->dax_mode, ctx->dax_dev); |
1dd53957 VG |
1531 | if (err) |
1532 | goto err; | |
1533 | } | |
e45b2546 | 1534 | |
7fd3abfa VG |
1535 | if (ctx->fudptr) { |
1536 | err = -ENOMEM; | |
1537 | fud = fuse_dev_alloc_install(fc); | |
1538 | if (!fud) | |
1dd53957 | 1539 | goto err_free_dax; |
7fd3abfa | 1540 | } |
cc080e9e | 1541 | |
a325f9b9 | 1542 | fc->dev = sb->s_dev; |
fcee216b | 1543 | fm->sb = sb; |
a325f9b9 TH |
1544 | err = fuse_bdi_init(fc, sb); |
1545 | if (err) | |
cc080e9e | 1546 | goto err_dev_free; |
0d179aa5 | 1547 | |
e0a43ddc | 1548 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1549 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1550 | fc->dont_mask = 1; |
1751e8a6 | 1551 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1552 | |
c30da2e9 DH |
1553 | fc->default_permissions = ctx->default_permissions; |
1554 | fc->allow_other = ctx->allow_other; | |
1555 | fc->user_id = ctx->user_id; | |
1556 | fc->group_id = ctx->group_id; | |
f4fd4ae3 | 1557 | fc->legacy_opts_show = ctx->legacy_opts_show; |
1866d779 | 1558 | fc->max_read = max_t(unsigned int, 4096, ctx->max_read); |
783863d6 | 1559 | fc->destroy = ctx->destroy; |
15c8e72e VG |
1560 | fc->no_control = ctx->no_control; |
1561 | fc->no_force_umount = ctx->no_force_umount; | |
f543f253 | 1562 | |
d8a5ba45 | 1563 | err = -ENOMEM; |
c30da2e9 | 1564 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1565 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1566 | root_dentry = d_make_root(root); |
1567 | if (!root_dentry) | |
cc080e9e | 1568 | goto err_dev_free; |
0ce267ff | 1569 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1570 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1571 | |
bafa9654 | 1572 | mutex_lock(&fuse_mutex); |
8aa09a50 | 1573 | err = -EINVAL; |
7fd3abfa | 1574 | if (ctx->fudptr && *ctx->fudptr) |
bafa9654 | 1575 | goto err_unlock; |
8aa09a50 | 1576 | |
bafa9654 MS |
1577 | err = fuse_ctl_add_conn(fc); |
1578 | if (err) | |
1579 | goto err_unlock; | |
1580 | ||
1581 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1582 | sb->s_root = root_dentry; |
7fd3abfa VG |
1583 | if (ctx->fudptr) |
1584 | *ctx->fudptr = fud; | |
bafa9654 | 1585 | mutex_unlock(&fuse_mutex); |
0cc2656c SH |
1586 | return 0; |
1587 | ||
1588 | err_unlock: | |
1589 | mutex_unlock(&fuse_mutex); | |
1590 | dput(root_dentry); | |
1591 | err_dev_free: | |
7fd3abfa VG |
1592 | if (fud) |
1593 | fuse_dev_free(fud); | |
1dd53957 VG |
1594 | err_free_dax: |
1595 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
1596 | fuse_dax_conn_free(fc); | |
0cc2656c SH |
1597 | err: |
1598 | return err; | |
1599 | } | |
1600 | EXPORT_SYMBOL_GPL(fuse_fill_super_common); | |
1601 | ||
1602 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) | |
1603 | { | |
1604 | struct fuse_fs_context *ctx = fsc->fs_private; | |
0cc2656c | 1605 | int err; |
0cc2656c | 1606 | |
62dd1fc8 | 1607 | if (!ctx->file || !ctx->rootmode_present || |
badc7414 MS |
1608 | !ctx->user_id_present || !ctx->group_id_present) |
1609 | return -EINVAL; | |
0cc2656c SH |
1610 | |
1611 | /* | |
1612 | * Require mount to happen from the same user namespace which | |
1613 | * opened /dev/fuse to prevent potential attacks. | |
1614 | */ | |
62dd1fc8 MS |
1615 | if ((ctx->file->f_op != &fuse_dev_operations) || |
1616 | (ctx->file->f_cred->user_ns != sb->s_user_ns)) | |
964d32e5 | 1617 | return -EINVAL; |
62dd1fc8 | 1618 | ctx->fudptr = &ctx->file->private_data; |
0cc2656c | 1619 | |
0cc2656c SH |
1620 | err = fuse_fill_super_common(sb, ctx); |
1621 | if (err) | |
964d32e5 | 1622 | return err; |
62dd1fc8 MS |
1623 | /* file->private_data shall be visible on all CPUs after this */ |
1624 | smp_mb(); | |
fcee216b | 1625 | fuse_send_init(get_fuse_mount_super(sb)); |
d8a5ba45 | 1626 | return 0; |
d8a5ba45 MS |
1627 | } |
1628 | ||
5d5b74aa MS |
1629 | /* |
1630 | * This is the path where user supplied an already initialized fuse dev. In | |
1631 | * this case never create a new super if the old one is gone. | |
1632 | */ | |
1633 | static int fuse_set_no_super(struct super_block *sb, struct fs_context *fsc) | |
d8a5ba45 | 1634 | { |
5d5b74aa MS |
1635 | return -ENOTCONN; |
1636 | } | |
c30da2e9 | 1637 | |
5d5b74aa MS |
1638 | static int fuse_test_super(struct super_block *sb, struct fs_context *fsc) |
1639 | { | |
c30da2e9 | 1640 | |
5d5b74aa MS |
1641 | return fsc->sget_key == get_fuse_conn_super(sb); |
1642 | } | |
1643 | ||
84c21507 | 1644 | static int fuse_get_tree(struct fs_context *fsc) |
d8a5ba45 | 1645 | { |
84c21507 | 1646 | struct fuse_fs_context *ctx = fsc->fs_private; |
5d5b74aa | 1647 | struct fuse_dev *fud; |
80019f11 MS |
1648 | struct fuse_conn *fc; |
1649 | struct fuse_mount *fm; | |
5d5b74aa | 1650 | struct super_block *sb; |
62dd1fc8 | 1651 | int err; |
c30da2e9 | 1652 | |
80019f11 MS |
1653 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
1654 | if (!fc) | |
1655 | return -ENOMEM; | |
1656 | ||
1657 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); | |
1658 | if (!fm) { | |
1659 | kfree(fc); | |
1660 | return -ENOMEM; | |
1661 | } | |
1662 | ||
1663 | fuse_conn_init(fc, fm, fsc->user_ns, &fuse_dev_fiq_ops, NULL); | |
1664 | fc->release = fuse_free_conn; | |
1665 | ||
1666 | fsc->s_fs_info = fm; | |
1667 | ||
62dd1fc8 MS |
1668 | if (ctx->fd_present) |
1669 | ctx->file = fget(ctx->fd); | |
c30da2e9 | 1670 | |
badc7414 | 1671 | if (IS_ENABLED(CONFIG_BLOCK) && ctx->is_bdev) { |
62dd1fc8 | 1672 | err = get_tree_bdev(fsc, fuse_fill_super); |
80019f11 | 1673 | goto out; |
badc7414 | 1674 | } |
5d5b74aa MS |
1675 | /* |
1676 | * While block dev mount can be initialized with a dummy device fd | |
1677 | * (found by device name), normal fuse mounts can't | |
1678 | */ | |
80019f11 | 1679 | err = -EINVAL; |
5d5b74aa | 1680 | if (!ctx->file) |
80019f11 | 1681 | goto out; |
c30da2e9 | 1682 | |
5d5b74aa MS |
1683 | /* |
1684 | * Allow creating a fuse mount with an already initialized fuse | |
1685 | * connection | |
1686 | */ | |
1687 | fud = READ_ONCE(ctx->file->private_data); | |
1688 | if (ctx->file->f_op == &fuse_dev_operations && fud) { | |
1689 | fsc->sget_key = fud->fc; | |
1690 | sb = sget_fc(fsc, fuse_test_super, fuse_set_no_super); | |
1691 | err = PTR_ERR_OR_ZERO(sb); | |
1692 | if (!IS_ERR(sb)) | |
1693 | fsc->root = dget(sb->s_root); | |
1694 | } else { | |
1695 | err = get_tree_nodev(fsc, fuse_fill_super); | |
1696 | } | |
80019f11 MS |
1697 | out: |
1698 | if (fsc->s_fs_info) | |
1699 | fuse_mount_destroy(fm); | |
62dd1fc8 MS |
1700 | if (ctx->file) |
1701 | fput(ctx->file); | |
1702 | return err; | |
c30da2e9 DH |
1703 | } |
1704 | ||
1705 | static const struct fs_context_operations fuse_context_ops = { | |
84c21507 | 1706 | .free = fuse_free_fsc, |
c30da2e9 | 1707 | .parse_param = fuse_parse_param, |
0189a2d3 | 1708 | .reconfigure = fuse_reconfigure, |
c30da2e9 DH |
1709 | .get_tree = fuse_get_tree, |
1710 | }; | |
1711 | ||
1712 | /* | |
1713 | * Set up the filesystem mount context. | |
1714 | */ | |
84c21507 | 1715 | static int fuse_init_fs_context(struct fs_context *fsc) |
c30da2e9 DH |
1716 | { |
1717 | struct fuse_fs_context *ctx; | |
1718 | ||
1719 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1720 | if (!ctx) | |
1721 | return -ENOMEM; | |
1722 | ||
1723 | ctx->max_read = ~0; | |
1724 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
f4fd4ae3 | 1725 | ctx->legacy_opts_show = true; |
c30da2e9 DH |
1726 | |
1727 | #ifdef CONFIG_BLOCK | |
84c21507 | 1728 | if (fsc->fs_type == &fuseblk_fs_type) { |
c30da2e9 | 1729 | ctx->is_bdev = true; |
783863d6 MS |
1730 | ctx->destroy = true; |
1731 | } | |
c30da2e9 DH |
1732 | #endif |
1733 | ||
84c21507 MS |
1734 | fsc->fs_private = ctx; |
1735 | fsc->ops = &fuse_context_ops; | |
c30da2e9 | 1736 | return 0; |
d8a5ba45 MS |
1737 | } |
1738 | ||
fcee216b | 1739 | bool fuse_mount_remove(struct fuse_mount *fm) |
3b463ae0 | 1740 | { |
fcee216b MR |
1741 | struct fuse_conn *fc = fm->fc; |
1742 | bool last = false; | |
3b463ae0 | 1743 | |
fcee216b MR |
1744 | down_write(&fc->killsb); |
1745 | list_del_init(&fm->fc_entry); | |
1746 | if (list_empty(&fc->mounts)) | |
1747 | last = true; | |
1748 | up_write(&fc->killsb); | |
e8f3bd77 | 1749 | |
fcee216b MR |
1750 | return last; |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(fuse_mount_remove); | |
e8f3bd77 | 1753 | |
fcee216b MR |
1754 | void fuse_conn_destroy(struct fuse_mount *fm) |
1755 | { | |
1756 | struct fuse_conn *fc = fm->fc; | |
1757 | ||
1758 | if (fc->destroy) | |
1759 | fuse_send_destroy(fm); | |
1760 | ||
1761 | fuse_abort_conn(fc); | |
1762 | fuse_wait_aborted(fc); | |
413daa1a MS |
1763 | |
1764 | if (!list_empty(&fc->entry)) { | |
1765 | mutex_lock(&fuse_mutex); | |
1766 | list_del(&fc->entry); | |
1767 | fuse_ctl_remove_conn(fc); | |
1768 | mutex_unlock(&fuse_mutex); | |
3b463ae0 | 1769 | } |
e8f3bd77 | 1770 | } |
fcee216b | 1771 | EXPORT_SYMBOL_GPL(fuse_conn_destroy); |
3b463ae0 | 1772 | |
6a68d1e1 | 1773 | static void fuse_sb_destroy(struct super_block *sb) |
e8f3bd77 | 1774 | { |
fcee216b MR |
1775 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1776 | bool last; | |
1777 | ||
d534d31d | 1778 | if (sb->s_root) { |
fcee216b MR |
1779 | last = fuse_mount_remove(fm); |
1780 | if (last) | |
1781 | fuse_conn_destroy(fm); | |
1782 | } | |
6a68d1e1 MS |
1783 | } |
1784 | ||
a27c061a MS |
1785 | void fuse_mount_destroy(struct fuse_mount *fm) |
1786 | { | |
80019f11 MS |
1787 | fuse_conn_put(fm->fc); |
1788 | kfree(fm); | |
a27c061a MS |
1789 | } |
1790 | EXPORT_SYMBOL(fuse_mount_destroy); | |
1791 | ||
6a68d1e1 MS |
1792 | static void fuse_kill_sb_anon(struct super_block *sb) |
1793 | { | |
1794 | fuse_sb_destroy(sb); | |
3b463ae0 | 1795 | kill_anon_super(sb); |
a27c061a | 1796 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1797 | } |
1798 | ||
875d95ec MS |
1799 | static struct file_system_type fuse_fs_type = { |
1800 | .owner = THIS_MODULE, | |
1801 | .name = "fuse", | |
4ad769f3 | 1802 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 | 1803 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1804 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1805 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1806 | }; |
7f78e035 | 1807 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1808 | |
1809 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1810 | static void fuse_kill_sb_blk(struct super_block *sb) |
1811 | { | |
6a68d1e1 | 1812 | fuse_sb_destroy(sb); |
3b463ae0 | 1813 | kill_block_super(sb); |
a27c061a | 1814 | fuse_mount_destroy(get_fuse_mount_super(sb)); |
3b463ae0 JM |
1815 | } |
1816 | ||
d6392f87 MS |
1817 | static struct file_system_type fuseblk_fs_type = { |
1818 | .owner = THIS_MODULE, | |
1819 | .name = "fuseblk", | |
c30da2e9 | 1820 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1821 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1822 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1823 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1824 | }; |
7f78e035 | 1825 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1826 | |
875d95ec MS |
1827 | static inline int register_fuseblk(void) |
1828 | { | |
1829 | return register_filesystem(&fuseblk_fs_type); | |
1830 | } | |
1831 | ||
1832 | static inline void unregister_fuseblk(void) | |
1833 | { | |
1834 | unregister_filesystem(&fuseblk_fs_type); | |
1835 | } | |
1836 | #else | |
1837 | static inline int register_fuseblk(void) | |
1838 | { | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static inline void unregister_fuseblk(void) | |
1843 | { | |
1844 | } | |
1845 | #endif | |
1846 | ||
51cc5068 | 1847 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1848 | { |
1729a16c | 1849 | struct inode *inode = foo; |
d8a5ba45 | 1850 | |
a35afb83 | 1851 | inode_init_once(inode); |
d8a5ba45 MS |
1852 | } |
1853 | ||
1854 | static int __init fuse_fs_init(void) | |
1855 | { | |
1856 | int err; | |
1857 | ||
d6392f87 | 1858 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1859 | sizeof(struct fuse_inode), 0, |
1860 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1861 | fuse_inode_init_once); | |
d6392f87 MS |
1862 | err = -ENOMEM; |
1863 | if (!fuse_inode_cachep) | |
988f0325 AV |
1864 | goto out; |
1865 | ||
1866 | err = register_fuseblk(); | |
1867 | if (err) | |
1868 | goto out2; | |
1869 | ||
1870 | err = register_filesystem(&fuse_fs_type); | |
1871 | if (err) | |
1872 | goto out3; | |
d6392f87 MS |
1873 | |
1874 | return 0; | |
d8a5ba45 | 1875 | |
988f0325 | 1876 | out3: |
875d95ec | 1877 | unregister_fuseblk(); |
988f0325 AV |
1878 | out2: |
1879 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1880 | out: |
d8a5ba45 MS |
1881 | return err; |
1882 | } | |
1883 | ||
1884 | static void fuse_fs_cleanup(void) | |
1885 | { | |
1886 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1887 | unregister_fuseblk(); |
8c0a8537 KS |
1888 | |
1889 | /* | |
1890 | * Make sure all delayed rcu free inodes are flushed before we | |
1891 | * destroy cache. | |
1892 | */ | |
1893 | rcu_barrier(); | |
d8a5ba45 MS |
1894 | kmem_cache_destroy(fuse_inode_cachep); |
1895 | } | |
1896 | ||
5c89e17e | 1897 | static struct kobject *fuse_kobj; |
5c89e17e | 1898 | |
f543f253 MS |
1899 | static int fuse_sysfs_init(void) |
1900 | { | |
1901 | int err; | |
1902 | ||
00d26666 | 1903 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1904 | if (!fuse_kobj) { |
1905 | err = -ENOMEM; | |
f543f253 | 1906 | goto out_err; |
5c89e17e | 1907 | } |
f543f253 | 1908 | |
f9bb4882 EB |
1909 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1910 | if (err) | |
f543f253 MS |
1911 | goto out_fuse_unregister; |
1912 | ||
1913 | return 0; | |
1914 | ||
1915 | out_fuse_unregister: | |
197b12d6 | 1916 | kobject_put(fuse_kobj); |
f543f253 MS |
1917 | out_err: |
1918 | return err; | |
1919 | } | |
1920 | ||
1921 | static void fuse_sysfs_cleanup(void) | |
1922 | { | |
f9bb4882 | 1923 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1924 | kobject_put(fuse_kobj); |
f543f253 MS |
1925 | } |
1926 | ||
d8a5ba45 MS |
1927 | static int __init fuse_init(void) |
1928 | { | |
1929 | int res; | |
1930 | ||
f2294482 KS |
1931 | pr_info("init (API version %i.%i)\n", |
1932 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1933 | |
bafa9654 | 1934 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1935 | res = fuse_fs_init(); |
1936 | if (res) | |
1937 | goto err; | |
1938 | ||
334f485d MS |
1939 | res = fuse_dev_init(); |
1940 | if (res) | |
1941 | goto err_fs_cleanup; | |
1942 | ||
f543f253 MS |
1943 | res = fuse_sysfs_init(); |
1944 | if (res) | |
1945 | goto err_dev_cleanup; | |
1946 | ||
bafa9654 MS |
1947 | res = fuse_ctl_init(); |
1948 | if (res) | |
1949 | goto err_sysfs_cleanup; | |
1950 | ||
487ea5af CH |
1951 | sanitize_global_limit(&max_user_bgreq); |
1952 | sanitize_global_limit(&max_user_congthresh); | |
1953 | ||
d8a5ba45 MS |
1954 | return 0; |
1955 | ||
bafa9654 MS |
1956 | err_sysfs_cleanup: |
1957 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1958 | err_dev_cleanup: |
1959 | fuse_dev_cleanup(); | |
334f485d MS |
1960 | err_fs_cleanup: |
1961 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1962 | err: |
1963 | return res; | |
1964 | } | |
1965 | ||
1966 | static void __exit fuse_exit(void) | |
1967 | { | |
f2294482 | 1968 | pr_debug("exit\n"); |
d8a5ba45 | 1969 | |
bafa9654 | 1970 | fuse_ctl_cleanup(); |
f543f253 | 1971 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1972 | fuse_fs_cleanup(); |
334f485d | 1973 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1974 | } |
1975 | ||
1976 | module_init(fuse_init); | |
1977 | module_exit(fuse_exit); |