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); |
6ae330ca | 88 | init_rwsem(&fi->i_mmap_sem); |
f15ecfef | 89 | spin_lock_init(&fi->lock); |
07e77dca | 90 | fi->forget = fuse_alloc_forget(); |
c2d0ad00 VG |
91 | if (!fi->forget) |
92 | goto out_free; | |
93 | ||
94 | if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi)) | |
95 | goto out_free_forget; | |
d8a5ba45 | 96 | |
9031a69c | 97 | return &fi->inode; |
c2d0ad00 VG |
98 | |
99 | out_free_forget: | |
100 | kfree(fi->forget); | |
101 | out_free: | |
102 | kmem_cache_free(fuse_inode_cachep, fi); | |
103 | return NULL; | |
d8a5ba45 MS |
104 | } |
105 | ||
9baf28bb | 106 | static void fuse_free_inode(struct inode *inode) |
d8a5ba45 | 107 | { |
e5e5558e | 108 | struct fuse_inode *fi = get_fuse_inode(inode); |
9baf28bb | 109 | |
5c672ab3 | 110 | mutex_destroy(&fi->mutex); |
07e77dca | 111 | kfree(fi->forget); |
c2d0ad00 VG |
112 | #ifdef CONFIG_FUSE_DAX |
113 | kfree(fi->dax); | |
114 | #endif | |
9baf28bb | 115 | kmem_cache_free(fuse_inode_cachep, fi); |
d8a5ba45 MS |
116 | } |
117 | ||
b57922d9 | 118 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 119 | { |
9baf28bb AV |
120 | struct fuse_inode *fi = get_fuse_inode(inode); |
121 | ||
91b0abe3 | 122 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 123 | clear_inode(inode); |
1751e8a6 | 124 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 125 | struct fuse_conn *fc = get_fuse_conn(inode); |
c2d0ad00 VG |
126 | |
127 | if (FUSE_IS_DAX(inode)) | |
128 | fuse_dax_inode_cleanup(inode); | |
1866d779 MR |
129 | if (fi->nlookup) { |
130 | fuse_queue_forget(fc, fi->forget, fi->nodeid, | |
131 | fi->nlookup); | |
132 | fi->forget = NULL; | |
133 | } | |
e5e5558e | 134 | } |
9baf28bb AV |
135 | if (S_ISREG(inode->i_mode) && !is_bad_inode(inode)) { |
136 | WARN_ON(!list_empty(&fi->write_files)); | |
137 | WARN_ON(!list_empty(&fi->queued_writes)); | |
138 | } | |
d8a5ba45 MS |
139 | } |
140 | ||
0189a2d3 | 141 | static int fuse_reconfigure(struct fs_context *fc) |
71421259 | 142 | { |
0189a2d3 MS |
143 | struct super_block *sb = fc->root->d_sb; |
144 | ||
02b9984d | 145 | sync_filesystem(sb); |
0189a2d3 | 146 | if (fc->sb_flags & SB_MANDLOCK) |
71421259 MS |
147 | return -EINVAL; |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
45c72cd7 PS |
152 | /* |
153 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
154 | * so that it will fit. | |
155 | */ | |
156 | static ino_t fuse_squash_ino(u64 ino64) | |
157 | { | |
158 | ino_t ino = (ino_t) ino64; | |
159 | if (sizeof(ino_t) < sizeof(u64)) | |
160 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
161 | return ino; | |
162 | } | |
163 | ||
3be5a52b MS |
164 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
165 | u64 attr_valid) | |
d8a5ba45 | 166 | { |
9ffbb916 | 167 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 168 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 169 | |
f15ecfef KT |
170 | lockdep_assert_held(&fi->lock); |
171 | ||
4510d86f | 172 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
1fb69e78 | 173 | fi->i_time = attr_valid; |
2f1e8196 | 174 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 175 | |
45c72cd7 | 176 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 177 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 178 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
179 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
180 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 MS |
181 | inode->i_blocks = attr->blocks; |
182 | inode->i_atime.tv_sec = attr->atime; | |
183 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
184 | /* mtime from server may be stale due to local buffered write */ |
185 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
186 | inode->i_mtime.tv_sec = attr->mtime; | |
187 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
188 | inode->i_ctime.tv_sec = attr->ctime; |
189 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 190 | } |
e00d2c2d | 191 | |
0e9663ee MS |
192 | if (attr->blksize != 0) |
193 | inode->i_blkbits = ilog2(attr->blksize); | |
194 | else | |
195 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
196 | ||
ebc14c4d MS |
197 | /* |
198 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
199 | * to check permissions. This prevents failures due to the | |
200 | * check in may_delete(). | |
201 | */ | |
202 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 203 | if (!fc->default_permissions) |
ebc14c4d | 204 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
205 | |
206 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
207 | } |
208 | ||
209 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
210 | u64 attr_valid, u64 attr_version) | |
211 | { | |
212 | struct fuse_conn *fc = get_fuse_conn(inode); | |
213 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 214 | bool is_wb = fc->writeback_cache; |
3be5a52b | 215 | loff_t oldsize; |
a64ba10f | 216 | struct timespec64 old_mtime; |
3be5a52b | 217 | |
f15ecfef | 218 | spin_lock(&fi->lock); |
06a7c3c2 MP |
219 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
220 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 221 | spin_unlock(&fi->lock); |
3be5a52b MS |
222 | return; |
223 | } | |
224 | ||
a64ba10f | 225 | old_mtime = inode->i_mtime; |
3be5a52b | 226 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 227 | |
e00d2c2d | 228 | oldsize = inode->i_size; |
8373200b PE |
229 | /* |
230 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
231 | * extend local i_size without keeping userspace server in sync. So, | |
232 | * attr->size coming from server can be stale. We cannot trust it. | |
233 | */ | |
234 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
235 | i_size_write(inode, attr->size); | |
f15ecfef | 236 | spin_unlock(&fi->lock); |
e00d2c2d | 237 | |
8373200b | 238 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
239 | bool inval = false; |
240 | ||
241 | if (oldsize != attr->size) { | |
7caef267 | 242 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
243 | if (!fc->explicit_inval_data) |
244 | inval = true; | |
eed2179e | 245 | } else if (fc->auto_inval_data) { |
a64ba10f | 246 | struct timespec64 new_mtime = { |
eed2179e BF |
247 | .tv_sec = attr->mtime, |
248 | .tv_nsec = attr->mtimensec, | |
249 | }; | |
250 | ||
251 | /* | |
252 | * Auto inval mode also checks and invalidates if mtime | |
253 | * has changed. | |
254 | */ | |
a64ba10f | 255 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
256 | inval = true; |
257 | } | |
258 | ||
259 | if (inval) | |
260 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 261 | } |
d8a5ba45 MS |
262 | } |
263 | ||
264 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
265 | { | |
266 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 267 | inode->i_size = attr->size; |
b0aa7606 MP |
268 | inode->i_mtime.tv_sec = attr->mtime; |
269 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
270 | inode->i_ctime.tv_sec = attr->ctime; |
271 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
272 | if (S_ISREG(inode->i_mode)) { |
273 | fuse_init_common(inode); | |
b6aeaded | 274 | fuse_init_file_inode(inode); |
e5e5558e MS |
275 | } else if (S_ISDIR(inode->i_mode)) |
276 | fuse_init_dir(inode); | |
277 | else if (S_ISLNK(inode->i_mode)) | |
278 | fuse_init_symlink(inode); | |
279 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
280 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
281 | fuse_init_common(inode); | |
282 | init_special_inode(inode, inode->i_mode, | |
283 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
284 | } else |
285 | BUG(); | |
d8a5ba45 MS |
286 | } |
287 | ||
fcee216b | 288 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 289 | { |
b48badf0 | 290 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
291 | if (get_node_id(inode) == nodeid) |
292 | return 1; | |
293 | else | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
298 | { | |
b48badf0 | 299 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
300 | get_fuse_inode(inode)->nodeid = nodeid; |
301 | return 0; | |
302 | } | |
303 | ||
b48badf0 | 304 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
305 | int generation, struct fuse_attr *attr, |
306 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
307 | { |
308 | struct inode *inode; | |
9e6268db | 309 | struct fuse_inode *fi; |
d8a5ba45 | 310 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
311 | |
312 | retry: | |
313 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
314 | if (!inode) | |
315 | return NULL; | |
316 | ||
317 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 318 | inode->i_flags |= S_NOATIME; |
d31433c8 | 319 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 320 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 321 | inode->i_generation = generation; |
d8a5ba45 MS |
322 | fuse_init_inode(inode, attr); |
323 | unlock_new_inode(inode); | |
324 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
325 | /* Inode has changed type, any I/O on the old should fail */ |
326 | make_bad_inode(inode); | |
327 | iput(inode); | |
d8a5ba45 MS |
328 | goto retry; |
329 | } | |
330 | ||
9e6268db | 331 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 332 | spin_lock(&fi->lock); |
1729a16c | 333 | fi->nlookup++; |
c9d8f5f0 | 334 | spin_unlock(&fi->lock); |
1fb69e78 MS |
335 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
336 | ||
d8a5ba45 MS |
337 | return inode; |
338 | } | |
339 | ||
fcee216b MR |
340 | struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid, |
341 | struct fuse_mount **fm) | |
342 | { | |
343 | struct fuse_mount *fm_iter; | |
344 | struct inode *inode; | |
345 | ||
346 | WARN_ON(!rwsem_is_locked(&fc->killsb)); | |
347 | list_for_each_entry(fm_iter, &fc->mounts, fc_entry) { | |
348 | if (!fm_iter->sb) | |
349 | continue; | |
350 | ||
351 | inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid); | |
352 | if (inode) { | |
353 | if (fm) | |
354 | *fm = fm_iter; | |
355 | return inode; | |
356 | } | |
357 | } | |
358 | ||
359 | return NULL; | |
360 | } | |
361 | ||
362 | int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid, | |
3b463ae0 JM |
363 | loff_t offset, loff_t len) |
364 | { | |
5ddd9ced | 365 | struct fuse_inode *fi; |
3b463ae0 JM |
366 | struct inode *inode; |
367 | pgoff_t pg_start; | |
368 | pgoff_t pg_end; | |
369 | ||
fcee216b | 370 | inode = fuse_ilookup(fc, nodeid, NULL); |
3b463ae0 JM |
371 | if (!inode) |
372 | return -ENOENT; | |
373 | ||
5ddd9ced MS |
374 | fi = get_fuse_inode(inode); |
375 | spin_lock(&fi->lock); | |
376 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
377 | spin_unlock(&fi->lock); | |
378 | ||
3b463ae0 | 379 | fuse_invalidate_attr(inode); |
60bcc88a | 380 | forget_all_cached_acls(inode); |
3b463ae0 | 381 | if (offset >= 0) { |
09cbfeaf | 382 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
383 | if (len <= 0) |
384 | pg_end = -1; | |
385 | else | |
09cbfeaf | 386 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
387 | invalidate_inode_pages2_range(inode->i_mapping, |
388 | pg_start, pg_end); | |
389 | } | |
390 | iput(inode); | |
391 | return 0; | |
392 | } | |
393 | ||
63576c13 | 394 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 395 | { |
63576c13 MS |
396 | bool locked = false; |
397 | ||
398 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 399 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
400 | locked = true; |
401 | } | |
402 | ||
403 | return locked; | |
5c672ab3 MS |
404 | } |
405 | ||
63576c13 | 406 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 407 | { |
63576c13 | 408 | if (locked) |
5c672ab3 MS |
409 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
410 | } | |
411 | ||
42faad99 | 412 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 413 | { |
15c8e72e VG |
414 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
415 | ||
416 | if (!fc->no_force_umount) | |
417 | fuse_abort_conn(fc); | |
69a53bf2 MS |
418 | } |
419 | ||
fcee216b | 420 | static void fuse_send_destroy(struct fuse_mount *fm) |
0ec7ca41 | 421 | { |
fcee216b | 422 | if (fm->fc->conn_init) { |
1ccd1ea2 MS |
423 | FUSE_ARGS(args); |
424 | ||
425 | args.opcode = FUSE_DESTROY; | |
426 | args.force = true; | |
427 | args.nocreds = true; | |
fcee216b | 428 | fuse_simple_request(fm, &args); |
0ec7ca41 MS |
429 | } |
430 | } | |
431 | ||
a325f9b9 TH |
432 | static void fuse_put_super(struct super_block *sb) |
433 | { | |
fcee216b | 434 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
a325f9b9 | 435 | |
fcee216b | 436 | fuse_mount_put(fm); |
d8a5ba45 MS |
437 | } |
438 | ||
e5e5558e MS |
439 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
440 | { | |
441 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
442 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 443 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
444 | stbuf->f_blocks = attr->blocks; |
445 | stbuf->f_bfree = attr->bfree; | |
446 | stbuf->f_bavail = attr->bavail; | |
447 | stbuf->f_files = attr->files; | |
448 | stbuf->f_ffree = attr->ffree; | |
449 | stbuf->f_namelen = attr->namelen; | |
450 | /* fsid is left zero */ | |
451 | } | |
452 | ||
726c3342 | 453 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 454 | { |
726c3342 | 455 | struct super_block *sb = dentry->d_sb; |
fcee216b | 456 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 457 | FUSE_ARGS(args); |
e5e5558e MS |
458 | struct fuse_statfs_out outarg; |
459 | int err; | |
460 | ||
fcee216b | 461 | if (!fuse_allow_current_process(fm->fc)) { |
e57ac683 MS |
462 | buf->f_type = FUSE_SUPER_MAGIC; |
463 | return 0; | |
464 | } | |
465 | ||
de5f1202 | 466 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
467 | args.in_numargs = 0; |
468 | args.opcode = FUSE_STATFS; | |
469 | args.nodeid = get_node_id(d_inode(dentry)); | |
470 | args.out_numargs = 1; | |
471 | args.out_args[0].size = sizeof(outarg); | |
472 | args.out_args[0].value = &outarg; | |
fcee216b | 473 | err = fuse_simple_request(fm, &args); |
e5e5558e MS |
474 | if (!err) |
475 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
476 | return err; |
477 | } | |
478 | ||
d8a5ba45 | 479 | enum { |
c30da2e9 DH |
480 | OPT_SOURCE, |
481 | OPT_SUBTYPE, | |
d8a5ba45 MS |
482 | OPT_FD, |
483 | OPT_ROOTMODE, | |
484 | OPT_USER_ID, | |
87729a55 | 485 | OPT_GROUP_ID, |
d8a5ba45 MS |
486 | OPT_DEFAULT_PERMISSIONS, |
487 | OPT_ALLOW_OTHER, | |
db50b96c | 488 | OPT_MAX_READ, |
d8091614 | 489 | OPT_BLKSIZE, |
d8a5ba45 MS |
490 | OPT_ERR |
491 | }; | |
492 | ||
d7167b14 | 493 | static const struct fs_parameter_spec fuse_fs_parameters[] = { |
c30da2e9 DH |
494 | fsparam_string ("source", OPT_SOURCE), |
495 | fsparam_u32 ("fd", OPT_FD), | |
496 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
497 | fsparam_u32 ("user_id", OPT_USER_ID), | |
498 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
499 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
500 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
501 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
502 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 503 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
504 | {} |
505 | }; | |
506 | ||
c30da2e9 | 507 | static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param) |
233a01fa | 508 | { |
c30da2e9 DH |
509 | struct fs_parse_result result; |
510 | struct fuse_fs_context *ctx = fc->fs_private; | |
511 | int opt; | |
512 | ||
b330966f MS |
513 | if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { |
514 | /* | |
515 | * Ignore options coming from mount(MS_REMOUNT) for backward | |
516 | * compatibility. | |
517 | */ | |
518 | if (fc->oldapi) | |
519 | return 0; | |
520 | ||
521 | return invalfc(fc, "No changes allowed in reconfigure"); | |
522 | } | |
e8b20a47 | 523 | |
d7167b14 | 524 | opt = fs_parse(fc, fuse_fs_parameters, param, &result); |
c30da2e9 DH |
525 | if (opt < 0) |
526 | return opt; | |
527 | ||
528 | switch (opt) { | |
529 | case OPT_SOURCE: | |
530 | if (fc->source) | |
2e28c49e | 531 | return invalfc(fc, "Multiple sources specified"); |
c30da2e9 DH |
532 | fc->source = param->string; |
533 | param->string = NULL; | |
534 | break; | |
535 | ||
536 | case OPT_SUBTYPE: | |
537 | if (ctx->subtype) | |
2e28c49e | 538 | return invalfc(fc, "Multiple subtypes specified"); |
c30da2e9 DH |
539 | ctx->subtype = param->string; |
540 | param->string = NULL; | |
541 | return 0; | |
542 | ||
543 | case OPT_FD: | |
544 | ctx->fd = result.uint_32; | |
cabdb4fa | 545 | ctx->fd_present = true; |
c30da2e9 DH |
546 | break; |
547 | ||
548 | case OPT_ROOTMODE: | |
549 | if (!fuse_valid_type(result.uint_32)) | |
2e28c49e | 550 | return invalfc(fc, "Invalid rootmode"); |
c30da2e9 | 551 | ctx->rootmode = result.uint_32; |
cabdb4fa | 552 | ctx->rootmode_present = true; |
c30da2e9 DH |
553 | break; |
554 | ||
555 | case OPT_USER_ID: | |
556 | ctx->user_id = make_kuid(fc->user_ns, result.uint_32); | |
557 | if (!uid_valid(ctx->user_id)) | |
2e28c49e | 558 | return invalfc(fc, "Invalid user_id"); |
cabdb4fa | 559 | ctx->user_id_present = true; |
c30da2e9 DH |
560 | break; |
561 | ||
562 | case OPT_GROUP_ID: | |
563 | ctx->group_id = make_kgid(fc->user_ns, result.uint_32); | |
564 | if (!gid_valid(ctx->group_id)) | |
2e28c49e | 565 | return invalfc(fc, "Invalid group_id"); |
cabdb4fa | 566 | ctx->group_id_present = true; |
c30da2e9 DH |
567 | break; |
568 | ||
569 | case OPT_DEFAULT_PERMISSIONS: | |
cabdb4fa | 570 | ctx->default_permissions = true; |
c30da2e9 DH |
571 | break; |
572 | ||
573 | case OPT_ALLOW_OTHER: | |
cabdb4fa | 574 | ctx->allow_other = true; |
c30da2e9 DH |
575 | break; |
576 | ||
577 | case OPT_MAX_READ: | |
578 | ctx->max_read = result.uint_32; | |
579 | break; | |
580 | ||
581 | case OPT_BLKSIZE: | |
582 | if (!ctx->is_bdev) | |
2e28c49e | 583 | return invalfc(fc, "blksize only supported for fuseblk"); |
c30da2e9 DH |
584 | ctx->blksize = result.uint_32; |
585 | break; | |
586 | ||
587 | default: | |
588 | return -EINVAL; | |
233a01fa | 589 | } |
c30da2e9 DH |
590 | |
591 | return 0; | |
233a01fa MS |
592 | } |
593 | ||
c30da2e9 | 594 | static void fuse_free_fc(struct fs_context *fc) |
d8a5ba45 | 595 | { |
c30da2e9 | 596 | struct fuse_fs_context *ctx = fc->fs_private; |
5a533682 | 597 | |
c30da2e9 DH |
598 | if (ctx) { |
599 | kfree(ctx->subtype); | |
600 | kfree(ctx); | |
601 | } | |
d8a5ba45 MS |
602 | } |
603 | ||
34c80b1d | 604 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 605 | { |
34c80b1d AV |
606 | struct super_block *sb = root->d_sb; |
607 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 608 | |
f4fd4ae3 VG |
609 | if (fc->legacy_opts_show) { |
610 | seq_printf(m, ",user_id=%u", | |
611 | from_kuid_munged(fc->user_ns, fc->user_id)); | |
612 | seq_printf(m, ",group_id=%u", | |
613 | from_kgid_munged(fc->user_ns, fc->group_id)); | |
614 | if (fc->default_permissions) | |
615 | seq_puts(m, ",default_permissions"); | |
616 | if (fc->allow_other) | |
617 | seq_puts(m, ",allow_other"); | |
618 | if (fc->max_read != ~0) | |
619 | seq_printf(m, ",max_read=%u", fc->max_read); | |
620 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
621 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
622 | } | |
1dd53957 VG |
623 | #ifdef CONFIG_FUSE_DAX |
624 | if (fc->dax) | |
625 | seq_puts(m, ",dax"); | |
626 | #endif | |
627 | ||
d8a5ba45 MS |
628 | return 0; |
629 | } | |
630 | ||
ae3aad77 SH |
631 | static void fuse_iqueue_init(struct fuse_iqueue *fiq, |
632 | const struct fuse_iqueue_ops *ops, | |
633 | void *priv) | |
f88996a9 MS |
634 | { |
635 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
76e43c8c | 636 | spin_lock_init(&fiq->lock); |
f88996a9 MS |
637 | init_waitqueue_head(&fiq->waitq); |
638 | INIT_LIST_HEAD(&fiq->pending); | |
639 | INIT_LIST_HEAD(&fiq->interrupts); | |
640 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 641 | fiq->connected = 1; |
ae3aad77 SH |
642 | fiq->ops = ops; |
643 | fiq->priv = priv; | |
f88996a9 MS |
644 | } |
645 | ||
3a2b5b9c MS |
646 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
647 | { | |
be2ff42c KT |
648 | unsigned int i; |
649 | ||
45a91cb1 | 650 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
651 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
652 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 653 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 654 | fpq->connected = 1; |
3a2b5b9c MS |
655 | } |
656 | ||
fcee216b MR |
657 | void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm, |
658 | struct user_namespace *user_ns, | |
ae3aad77 | 659 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) |
d8a5ba45 | 660 | { |
0d179aa5 TH |
661 | memset(fc, 0, sizeof(*fc)); |
662 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 663 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 664 | init_rwsem(&fc->killsb); |
095fc40a | 665 | refcount_set(&fc->count, 1); |
c3696046 | 666 | atomic_set(&fc->dev_count, 1); |
0d179aa5 | 667 | init_waitqueue_head(&fc->blocked_waitq); |
ae3aad77 | 668 | fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv); |
0d179aa5 TH |
669 | INIT_LIST_HEAD(&fc->bg_queue); |
670 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 671 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 672 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
673 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
674 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 675 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 676 | fc->polled_files = RB_ROOT; |
0aada884 | 677 | fc->blocked = 0; |
796523fb | 678 | fc->initialized = 0; |
e16714d8 | 679 | fc->connected = 1; |
4510d86f | 680 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 681 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 682 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 683 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 684 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
fcee216b MR |
685 | |
686 | INIT_LIST_HEAD(&fc->mounts); | |
687 | list_add(&fm->fc_entry, &fc->mounts); | |
688 | fm->fc = fc; | |
689 | refcount_set(&fm->count, 1); | |
d8a5ba45 | 690 | } |
0d179aa5 | 691 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 692 | |
bafa9654 MS |
693 | void fuse_conn_put(struct fuse_conn *fc) |
694 | { | |
095fc40a | 695 | if (refcount_dec_and_test(&fc->count)) { |
a62a8ef9 SH |
696 | struct fuse_iqueue *fiq = &fc->iq; |
697 | ||
1dd53957 VG |
698 | if (IS_ENABLED(CONFIG_FUSE_DAX)) |
699 | fuse_dax_conn_free(fc); | |
a62a8ef9 SH |
700 | if (fiq->ops->release) |
701 | fiq->ops->release(fiq); | |
0b6e9ea0 | 702 | put_pid_ns(fc->pid_ns); |
8cb08329 | 703 | put_user_ns(fc->user_ns); |
43901aab | 704 | fc->release(fc); |
d2a85164 | 705 | } |
bafa9654 | 706 | } |
08cbf542 | 707 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
708 | |
709 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
710 | { | |
095fc40a | 711 | refcount_inc(&fc->count); |
bafa9654 MS |
712 | return fc; |
713 | } | |
08cbf542 | 714 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 715 | |
fcee216b MR |
716 | void fuse_mount_put(struct fuse_mount *fm) |
717 | { | |
718 | if (refcount_dec_and_test(&fm->count)) { | |
719 | if (fm->fc) | |
720 | fuse_conn_put(fm->fc); | |
721 | kfree(fm); | |
722 | } | |
723 | } | |
724 | EXPORT_SYMBOL_GPL(fuse_mount_put); | |
725 | ||
726 | struct fuse_mount *fuse_mount_get(struct fuse_mount *fm) | |
727 | { | |
728 | refcount_inc(&fm->count); | |
729 | return fm; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(fuse_mount_get); | |
732 | ||
b93f858a | 733 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
734 | { |
735 | struct fuse_attr attr; | |
736 | memset(&attr, 0, sizeof(attr)); | |
737 | ||
738 | attr.mode = mode; | |
739 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 740 | attr.nlink = 1; |
1fb69e78 | 741 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
742 | } |
743 | ||
1729a16c | 744 | struct fuse_inode_handle { |
dbd561d2 MS |
745 | u64 nodeid; |
746 | u32 generation; | |
747 | }; | |
748 | ||
749 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
750 | struct fuse_inode_handle *handle) | |
751 | { | |
33670fa2 | 752 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
753 | struct inode *inode; |
754 | struct dentry *entry; | |
755 | int err = -ESTALE; | |
756 | ||
757 | if (handle->nodeid == 0) | |
758 | goto out_err; | |
759 | ||
760 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
761 | if (!inode) { |
762 | struct fuse_entry_out outarg; | |
13983d06 | 763 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
764 | |
765 | if (!fc->export_support) | |
766 | goto out_err; | |
767 | ||
33670fa2 MS |
768 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
769 | &inode); | |
770 | if (err && err != -ENOENT) | |
771 | goto out_err; | |
772 | if (err || !inode) { | |
773 | err = -ESTALE; | |
774 | goto out_err; | |
775 | } | |
776 | err = -EIO; | |
777 | if (get_node_id(inode) != handle->nodeid) | |
778 | goto out_iput; | |
779 | } | |
dbd561d2 MS |
780 | err = -ESTALE; |
781 | if (inode->i_generation != handle->generation) | |
782 | goto out_iput; | |
783 | ||
44003728 | 784 | entry = d_obtain_alias(inode); |
c35eebe9 | 785 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 786 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
787 | |
788 | return entry; | |
789 | ||
790 | out_iput: | |
791 | iput(inode); | |
792 | out_err: | |
793 | return ERR_PTR(err); | |
794 | } | |
795 | ||
b0b0382b AV |
796 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
797 | struct inode *parent) | |
dbd561d2 | 798 | { |
b0b0382b | 799 | int len = parent ? 6 : 3; |
dbd561d2 MS |
800 | u64 nodeid; |
801 | u32 generation; | |
802 | ||
5fe0c237 AK |
803 | if (*max_len < len) { |
804 | *max_len = len; | |
94e07a75 | 805 | return FILEID_INVALID; |
5fe0c237 | 806 | } |
dbd561d2 MS |
807 | |
808 | nodeid = get_fuse_inode(inode)->nodeid; | |
809 | generation = inode->i_generation; | |
810 | ||
811 | fh[0] = (u32)(nodeid >> 32); | |
812 | fh[1] = (u32)(nodeid & 0xffffffff); | |
813 | fh[2] = generation; | |
814 | ||
b0b0382b | 815 | if (parent) { |
dbd561d2 MS |
816 | nodeid = get_fuse_inode(parent)->nodeid; |
817 | generation = parent->i_generation; | |
dbd561d2 MS |
818 | |
819 | fh[3] = (u32)(nodeid >> 32); | |
820 | fh[4] = (u32)(nodeid & 0xffffffff); | |
821 | fh[5] = generation; | |
822 | } | |
823 | ||
824 | *max_len = len; | |
b0b0382b | 825 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
826 | } |
827 | ||
828 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
829 | struct fid *fid, int fh_len, int fh_type) | |
830 | { | |
831 | struct fuse_inode_handle handle; | |
832 | ||
833 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
834 | return NULL; | |
835 | ||
836 | handle.nodeid = (u64) fid->raw[0] << 32; | |
837 | handle.nodeid |= (u64) fid->raw[1]; | |
838 | handle.generation = fid->raw[2]; | |
839 | return fuse_get_dentry(sb, &handle); | |
840 | } | |
841 | ||
842 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
843 | struct fid *fid, int fh_len, int fh_type) | |
844 | { | |
845 | struct fuse_inode_handle parent; | |
846 | ||
847 | if (fh_type != 0x82 || fh_len < 6) | |
848 | return NULL; | |
849 | ||
850 | parent.nodeid = (u64) fid->raw[3] << 32; | |
851 | parent.nodeid |= (u64) fid->raw[4]; | |
852 | parent.generation = fid->raw[5]; | |
853 | return fuse_get_dentry(sb, &parent); | |
854 | } | |
855 | ||
33670fa2 MS |
856 | static struct dentry *fuse_get_parent(struct dentry *child) |
857 | { | |
2b0143b5 | 858 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
859 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
860 | struct inode *inode; | |
861 | struct dentry *parent; | |
862 | struct fuse_entry_out outarg; | |
13983d06 | 863 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
864 | int err; |
865 | ||
866 | if (!fc->export_support) | |
867 | return ERR_PTR(-ESTALE); | |
868 | ||
33670fa2 MS |
869 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
870 | &name, &outarg, &inode); | |
44003728 CH |
871 | if (err) { |
872 | if (err == -ENOENT) | |
873 | return ERR_PTR(-ESTALE); | |
33670fa2 | 874 | return ERR_PTR(err); |
33670fa2 | 875 | } |
44003728 CH |
876 | |
877 | parent = d_obtain_alias(inode); | |
c35eebe9 | 878 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 879 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
880 | |
881 | return parent; | |
882 | } | |
dbd561d2 MS |
883 | |
884 | static const struct export_operations fuse_export_operations = { | |
885 | .fh_to_dentry = fuse_fh_to_dentry, | |
886 | .fh_to_parent = fuse_fh_to_parent, | |
887 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 888 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
889 | }; |
890 | ||
ee9b6d61 | 891 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 892 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 893 | .free_inode = fuse_free_inode, |
b57922d9 | 894 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 895 | .write_inode = fuse_write_inode, |
ead5f0b5 | 896 | .drop_inode = generic_delete_inode, |
d8a5ba45 | 897 | .put_super = fuse_put_super, |
69a53bf2 | 898 | .umount_begin = fuse_umount_begin, |
e5e5558e | 899 | .statfs = fuse_statfs, |
d8a5ba45 MS |
900 | .show_options = fuse_show_options, |
901 | }; | |
902 | ||
487ea5af CH |
903 | static void sanitize_global_limit(unsigned *limit) |
904 | { | |
f22f812d MS |
905 | /* |
906 | * The default maximum number of async requests is calculated to consume | |
907 | * 1/2^13 of the total memory, assuming 392 bytes per request. | |
908 | */ | |
487ea5af | 909 | if (*limit == 0) |
f22f812d | 910 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392; |
487ea5af CH |
911 | |
912 | if (*limit >= 1 << 16) | |
913 | *limit = (1 << 16) - 1; | |
914 | } | |
915 | ||
e4dca7b7 | 916 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
917 | { |
918 | int rv; | |
919 | ||
920 | rv = param_set_uint(val, kp); | |
921 | if (rv) | |
922 | return rv; | |
923 | ||
924 | sanitize_global_limit((unsigned *)kp->arg); | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
930 | { | |
931 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
932 | ||
933 | if (arg->minor < 13) | |
934 | return; | |
935 | ||
936 | sanitize_global_limit(&max_user_bgreq); | |
937 | sanitize_global_limit(&max_user_congthresh); | |
938 | ||
ae2dffa3 | 939 | spin_lock(&fc->bg_lock); |
487ea5af CH |
940 | if (arg->max_background) { |
941 | fc->max_background = arg->max_background; | |
942 | ||
943 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
944 | fc->max_background = max_user_bgreq; | |
945 | } | |
946 | if (arg->congestion_threshold) { | |
947 | fc->congestion_threshold = arg->congestion_threshold; | |
948 | ||
949 | if (!cap_sys_admin && | |
950 | fc->congestion_threshold > max_user_congthresh) | |
951 | fc->congestion_threshold = max_user_congthresh; | |
952 | } | |
ae2dffa3 | 953 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
954 | } |
955 | ||
615047ef MS |
956 | struct fuse_init_args { |
957 | struct fuse_args args; | |
958 | struct fuse_init_in in; | |
959 | struct fuse_init_out out; | |
960 | }; | |
961 | ||
fcee216b | 962 | static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args, |
615047ef | 963 | int error) |
9b9a0469 | 964 | { |
fcee216b | 965 | struct fuse_conn *fc = fm->fc; |
615047ef MS |
966 | struct fuse_init_args *ia = container_of(args, typeof(*ia), args); |
967 | struct fuse_init_out *arg = &ia->out; | |
fd1a1dc6 | 968 | bool ok = true; |
9b9a0469 | 969 | |
615047ef | 970 | if (error || arg->major != FUSE_KERNEL_VERSION) |
fd1a1dc6 | 971 | ok = false; |
9b9a0469 | 972 | else { |
9cd68455 MS |
973 | unsigned long ra_pages; |
974 | ||
487ea5af CH |
975 | process_init_limits(fc, arg); |
976 | ||
9cd68455 | 977 | if (arg->minor >= 6) { |
09cbfeaf | 978 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
979 | if (arg->flags & FUSE_ASYNC_READ) |
980 | fc->async_read = 1; | |
71421259 MS |
981 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
982 | fc->no_lock = 1; | |
37fb3a30 MS |
983 | if (arg->minor >= 17) { |
984 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
985 | fc->no_flock = 1; | |
24114504 MS |
986 | } else { |
987 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
988 | fc->no_flock = 1; | |
37fb3a30 | 989 | } |
6ff958ed MS |
990 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
991 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
992 | if (arg->minor >= 9) { |
993 | /* LOOKUP has dependency on proto version */ | |
994 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
995 | fc->export_support = 1; | |
996 | } | |
78bb6cb9 MS |
997 | if (arg->flags & FUSE_BIG_WRITES) |
998 | fc->big_writes = 1; | |
e0a43ddc MS |
999 | if (arg->flags & FUSE_DONT_MASK) |
1000 | fc->dont_mask = 1; | |
72d0d248 BF |
1001 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
1002 | fc->auto_inval_data = 1; | |
ad2ba64d KS |
1003 | else if (arg->flags & FUSE_EXPLICIT_INVAL_DATA) |
1004 | fc->explicit_inval_data = 1; | |
28420dad | 1005 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 1006 | fc->do_readdirplus = 1; |
28420dad MS |
1007 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
1008 | fc->readdirplus_auto = 1; | |
1009 | } | |
60b9df7a MS |
1010 | if (arg->flags & FUSE_ASYNC_DIO) |
1011 | fc->async_dio = 1; | |
4d99ff8f PE |
1012 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
1013 | fc->writeback_cache = 1; | |
5c672ab3 MS |
1014 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
1015 | fc->parallel_dirops = 1; | |
5e940c1d MS |
1016 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
1017 | fc->handle_killpriv = 1; | |
e27c9d38 | 1018 | if (arg->time_gran && arg->time_gran <= 1000000000) |
fcee216b | 1019 | fm->sb->s_time_gran = arg->time_gran; |
60bcc88a | 1020 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 1021 | fc->default_permissions = 1; |
60bcc88a | 1022 | fc->posix_acl = 1; |
fcee216b | 1023 | fm->sb->s_xattr = fuse_acl_xattr_handlers; |
60bcc88a | 1024 | } |
5571f1e6 DS |
1025 | if (arg->flags & FUSE_CACHE_SYMLINKS) |
1026 | fc->cache_symlinks = 1; | |
3b7008b2 SL |
1027 | if (arg->flags & FUSE_ABORT_ERROR) |
1028 | fc->abort_err = 1; | |
5da784cc CS |
1029 | if (arg->flags & FUSE_MAX_PAGES) { |
1030 | fc->max_pages = | |
1031 | min_t(unsigned int, FUSE_MAX_MAX_PAGES, | |
1032 | max_t(unsigned int, arg->max_pages, 1)); | |
1033 | } | |
fd1a1dc6 SH |
1034 | if (IS_ENABLED(CONFIG_FUSE_DAX) && |
1035 | arg->flags & FUSE_MAP_ALIGNMENT && | |
1036 | !fuse_dax_check_alignment(fc, arg->map_alignment)) { | |
1037 | ok = false; | |
1038 | } | |
71421259 | 1039 | } else { |
09cbfeaf | 1040 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 1041 | fc->no_lock = 1; |
37fb3a30 | 1042 | fc->no_flock = 1; |
71421259 | 1043 | } |
9cd68455 | 1044 | |
fcee216b MR |
1045 | fm->sb->s_bdi->ra_pages = |
1046 | min(fm->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
1047 | fc->minor = arg->minor; |
1048 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 1049 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 1050 | fc->conn_init = 1; |
9b9a0469 | 1051 | } |
615047ef MS |
1052 | kfree(ia); |
1053 | ||
fd1a1dc6 SH |
1054 | if (!ok) { |
1055 | fc->conn_init = 0; | |
1056 | fc->conn_error = 1; | |
1057 | } | |
1058 | ||
9759bd51 | 1059 | fuse_set_initialized(fc); |
08a53cdc | 1060 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
1061 | } |
1062 | ||
fcee216b | 1063 | void fuse_send_init(struct fuse_mount *fm) |
9b9a0469 | 1064 | { |
615047ef | 1065 | struct fuse_init_args *ia; |
095da6cb | 1066 | |
615047ef MS |
1067 | ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL); |
1068 | ||
1069 | ia->in.major = FUSE_KERNEL_VERSION; | |
1070 | ia->in.minor = FUSE_KERNEL_MINOR_VERSION; | |
fcee216b | 1071 | ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE; |
615047ef MS |
1072 | ia->in.flags |= |
1073 | FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | | |
37fb3a30 | 1074 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 1075 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 1076 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 1077 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 1078 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 1079 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 1080 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
ad2ba64d | 1081 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA; |
fd1a1dc6 | 1082 | #ifdef CONFIG_FUSE_DAX |
fcee216b | 1083 | if (fm->fc->dax) |
fd1a1dc6 SH |
1084 | ia->in.flags |= FUSE_MAP_ALIGNMENT; |
1085 | #endif | |
615047ef MS |
1086 | ia->args.opcode = FUSE_INIT; |
1087 | ia->args.in_numargs = 1; | |
1088 | ia->args.in_args[0].size = sizeof(ia->in); | |
1089 | ia->args.in_args[0].value = &ia->in; | |
1090 | ia->args.out_numargs = 1; | |
3ad2f3fb | 1091 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
1092 | with interface version < 7.5. Rest of init_out is zeroed |
1093 | by do_get_request(), so a short reply is not a problem */ | |
cabdb4fa | 1094 | ia->args.out_argvar = true; |
615047ef MS |
1095 | ia->args.out_args[0].size = sizeof(ia->out); |
1096 | ia->args.out_args[0].value = &ia->out; | |
1097 | ia->args.force = true; | |
1098 | ia->args.nocreds = true; | |
1099 | ia->args.end = process_init_reply; | |
1100 | ||
fcee216b MR |
1101 | if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0) |
1102 | process_init_reply(fm, &ia->args, -ENOTCONN); | |
9b9a0469 | 1103 | } |
95a84cdb | 1104 | EXPORT_SYMBOL_GPL(fuse_send_init); |
9b9a0469 | 1105 | |
783863d6 | 1106 | void fuse_free_conn(struct fuse_conn *fc) |
43901aab | 1107 | { |
cc080e9e | 1108 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 1109 | kfree_rcu(fc, rcu); |
43901aab | 1110 | } |
783863d6 | 1111 | EXPORT_SYMBOL_GPL(fuse_free_conn); |
43901aab | 1112 | |
a325f9b9 TH |
1113 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1114 | { | |
1115 | int err; | |
5f7f7543 | 1116 | char *suffix = ""; |
a325f9b9 | 1117 | |
69c8ebf8 | 1118 | if (sb->s_bdev) { |
5f7f7543 | 1119 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1120 | /* |
1121 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1122 | * it to our private bdi... | |
1123 | */ | |
1124 | bdi_put(sb->s_bdi); | |
1125 | sb->s_bdi = &noop_backing_dev_info; | |
1126 | } | |
5f7f7543 JK |
1127 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1128 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1129 | if (err) |
1130 | return err; | |
1131 | ||
b5420237 | 1132 | sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; |
5f7f7543 JK |
1133 | /* fuse does it's own writeback accounting */ |
1134 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1135 | |
a325f9b9 TH |
1136 | /* |
1137 | * For a single fuse filesystem use max 1% of dirty + | |
1138 | * writeback threshold. | |
1139 | * | |
1140 | * This gives about 1M of write buffer for memory maps on a | |
1141 | * machine with 1G and 10% dirty_ratio, which should be more | |
1142 | * than enough. | |
1143 | * | |
1144 | * Privileged users can raise it by writing to | |
1145 | * | |
1146 | * /sys/class/bdi/<bdi>/max_ratio | |
1147 | */ | |
5f7f7543 | 1148 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1149 | |
1150 | return 0; | |
1151 | } | |
1152 | ||
0cd1eb9a | 1153 | struct fuse_dev *fuse_dev_alloc(void) |
cc080e9e MS |
1154 | { |
1155 | struct fuse_dev *fud; | |
be2ff42c | 1156 | struct list_head *pq; |
cc080e9e MS |
1157 | |
1158 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1159 | if (!fud) |
1160 | return NULL; | |
cc080e9e | 1161 | |
be2ff42c KT |
1162 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1163 | if (!pq) { | |
1164 | kfree(fud); | |
1165 | return NULL; | |
cc080e9e MS |
1166 | } |
1167 | ||
be2ff42c | 1168 | fud->pq.processing = pq; |
be2ff42c KT |
1169 | fuse_pqueue_init(&fud->pq); |
1170 | ||
0cd1eb9a VG |
1171 | return fud; |
1172 | } | |
1173 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1174 | ||
1175 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc) | |
1176 | { | |
1177 | fud->fc = fuse_conn_get(fc); | |
be2ff42c KT |
1178 | spin_lock(&fc->lock); |
1179 | list_add_tail(&fud->entry, &fc->devices); | |
1180 | spin_unlock(&fc->lock); | |
0cd1eb9a VG |
1181 | } |
1182 | EXPORT_SYMBOL_GPL(fuse_dev_install); | |
be2ff42c | 1183 | |
0cd1eb9a VG |
1184 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc) |
1185 | { | |
1186 | struct fuse_dev *fud; | |
1187 | ||
1188 | fud = fuse_dev_alloc(); | |
1189 | if (!fud) | |
1190 | return NULL; | |
1191 | ||
1192 | fuse_dev_install(fud, fc); | |
cc080e9e MS |
1193 | return fud; |
1194 | } | |
0cd1eb9a | 1195 | EXPORT_SYMBOL_GPL(fuse_dev_alloc_install); |
cc080e9e MS |
1196 | |
1197 | void fuse_dev_free(struct fuse_dev *fud) | |
1198 | { | |
1199 | struct fuse_conn *fc = fud->fc; | |
1200 | ||
1201 | if (fc) { | |
1202 | spin_lock(&fc->lock); | |
1203 | list_del(&fud->entry); | |
1204 | spin_unlock(&fc->lock); | |
1205 | ||
1206 | fuse_conn_put(fc); | |
1207 | } | |
d72f70da | 1208 | kfree(fud->pq.processing); |
cc080e9e MS |
1209 | kfree(fud); |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1212 | ||
1866d779 MR |
1213 | static void fuse_fill_attr_from_inode(struct fuse_attr *attr, |
1214 | const struct fuse_inode *fi) | |
1215 | { | |
1216 | *attr = (struct fuse_attr){ | |
1217 | .ino = fi->inode.i_ino, | |
1218 | .size = fi->inode.i_size, | |
1219 | .blocks = fi->inode.i_blocks, | |
1220 | .atime = fi->inode.i_atime.tv_sec, | |
1221 | .mtime = fi->inode.i_mtime.tv_sec, | |
1222 | .ctime = fi->inode.i_ctime.tv_sec, | |
1223 | .atimensec = fi->inode.i_atime.tv_nsec, | |
1224 | .mtimensec = fi->inode.i_mtime.tv_nsec, | |
1225 | .ctimensec = fi->inode.i_ctime.tv_nsec, | |
1226 | .mode = fi->inode.i_mode, | |
1227 | .nlink = fi->inode.i_nlink, | |
1228 | .uid = fi->inode.i_uid.val, | |
1229 | .gid = fi->inode.i_gid.val, | |
1230 | .rdev = fi->inode.i_rdev, | |
1231 | .blksize = 1u << fi->inode.i_blkbits, | |
1232 | }; | |
1233 | } | |
1234 | ||
1235 | static void fuse_sb_defaults(struct super_block *sb) | |
1236 | { | |
1237 | sb->s_magic = FUSE_SUPER_MAGIC; | |
1238 | sb->s_op = &fuse_super_operations; | |
1239 | sb->s_xattr = fuse_xattr_handlers; | |
1240 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1241 | sb->s_time_gran = 1; | |
1242 | sb->s_export_op = &fuse_export_operations; | |
1243 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; | |
1244 | if (sb->s_user_ns != &init_user_ns) | |
1245 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
1246 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); | |
1247 | ||
1248 | /* | |
1249 | * If we are not in the initial user namespace posix | |
1250 | * acls must be translated. | |
1251 | */ | |
1252 | if (sb->s_user_ns != &init_user_ns) | |
1253 | sb->s_xattr = fuse_no_acl_xattr_handlers; | |
1254 | } | |
1255 | ||
1256 | int fuse_fill_super_submount(struct super_block *sb, | |
1257 | struct fuse_inode *parent_fi) | |
1258 | { | |
1259 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
1260 | struct super_block *parent_sb = parent_fi->inode.i_sb; | |
1261 | struct fuse_attr root_attr; | |
1262 | struct inode *root; | |
1263 | ||
1264 | fuse_sb_defaults(sb); | |
1265 | fm->sb = sb; | |
1266 | ||
1267 | WARN_ON(sb->s_bdi != &noop_backing_dev_info); | |
1268 | sb->s_bdi = bdi_get(parent_sb->s_bdi); | |
1269 | ||
1270 | sb->s_xattr = parent_sb->s_xattr; | |
1271 | sb->s_time_gran = parent_sb->s_time_gran; | |
1272 | sb->s_blocksize = parent_sb->s_blocksize; | |
1273 | sb->s_blocksize_bits = parent_sb->s_blocksize_bits; | |
1274 | sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL); | |
1275 | if (parent_sb->s_subtype && !sb->s_subtype) | |
1276 | return -ENOMEM; | |
1277 | ||
1278 | fuse_fill_attr_from_inode(&root_attr, parent_fi); | |
1279 | root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0); | |
1280 | /* | |
1281 | * This inode is just a duplicate, so it is not looked up and | |
1282 | * its nlookup should not be incremented. fuse_iget() does | |
1283 | * that, though, so undo it here. | |
1284 | */ | |
1285 | get_fuse_inode(root)->nlookup--; | |
1286 | sb->s_d_op = &fuse_dentry_operations; | |
1287 | sb->s_root = d_make_root(root); | |
1288 | if (!sb->s_root) | |
1289 | return -ENOMEM; | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
0cc2656c | 1294 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) |
d8a5ba45 | 1295 | { |
7fd3abfa | 1296 | struct fuse_dev *fud = NULL; |
fcee216b MR |
1297 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1298 | struct fuse_conn *fc = fm->fc; | |
d8a5ba45 | 1299 | struct inode *root; |
f543f253 | 1300 | struct dentry *root_dentry; |
d8a5ba45 MS |
1301 | int err; |
1302 | ||
c2b8f006 | 1303 | err = -EINVAL; |
1751e8a6 | 1304 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1305 | goto err; |
71421259 | 1306 | |
1866d779 | 1307 | fuse_sb_defaults(sb); |
9e1f1de0 | 1308 | |
0cc2656c | 1309 | if (ctx->is_bdev) { |
875d95ec | 1310 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1311 | err = -EINVAL; |
c30da2e9 | 1312 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1313 | goto err; |
875d95ec | 1314 | #endif |
d8091614 | 1315 | } else { |
09cbfeaf KS |
1316 | sb->s_blocksize = PAGE_SIZE; |
1317 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1318 | } |
c30da2e9 DH |
1319 | |
1320 | sb->s_subtype = ctx->subtype; | |
1321 | ctx->subtype = NULL; | |
1dd53957 VG |
1322 | if (IS_ENABLED(CONFIG_FUSE_DAX)) { |
1323 | err = fuse_dax_conn_alloc(fc, ctx->dax_dev); | |
1324 | if (err) | |
1325 | goto err; | |
1326 | } | |
1327 | ||
7fd3abfa VG |
1328 | if (ctx->fudptr) { |
1329 | err = -ENOMEM; | |
1330 | fud = fuse_dev_alloc_install(fc); | |
1331 | if (!fud) | |
1dd53957 | 1332 | goto err_free_dax; |
7fd3abfa | 1333 | } |
cc080e9e | 1334 | |
a325f9b9 | 1335 | fc->dev = sb->s_dev; |
fcee216b | 1336 | fm->sb = sb; |
a325f9b9 TH |
1337 | err = fuse_bdi_init(fc, sb); |
1338 | if (err) | |
cc080e9e | 1339 | goto err_dev_free; |
0d179aa5 | 1340 | |
e0a43ddc | 1341 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1342 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1343 | fc->dont_mask = 1; |
1751e8a6 | 1344 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1345 | |
c30da2e9 DH |
1346 | fc->default_permissions = ctx->default_permissions; |
1347 | fc->allow_other = ctx->allow_other; | |
1348 | fc->user_id = ctx->user_id; | |
1349 | fc->group_id = ctx->group_id; | |
f4fd4ae3 | 1350 | fc->legacy_opts_show = ctx->legacy_opts_show; |
1866d779 | 1351 | fc->max_read = max_t(unsigned int, 4096, ctx->max_read); |
783863d6 | 1352 | fc->destroy = ctx->destroy; |
15c8e72e VG |
1353 | fc->no_control = ctx->no_control; |
1354 | fc->no_force_umount = ctx->no_force_umount; | |
f543f253 | 1355 | |
d8a5ba45 | 1356 | err = -ENOMEM; |
c30da2e9 | 1357 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1358 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1359 | root_dentry = d_make_root(root); |
1360 | if (!root_dentry) | |
cc080e9e | 1361 | goto err_dev_free; |
0ce267ff | 1362 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1363 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1364 | |
bafa9654 | 1365 | mutex_lock(&fuse_mutex); |
8aa09a50 | 1366 | err = -EINVAL; |
7fd3abfa | 1367 | if (ctx->fudptr && *ctx->fudptr) |
bafa9654 | 1368 | goto err_unlock; |
8aa09a50 | 1369 | |
bafa9654 MS |
1370 | err = fuse_ctl_add_conn(fc); |
1371 | if (err) | |
1372 | goto err_unlock; | |
1373 | ||
1374 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1375 | sb->s_root = root_dentry; |
7fd3abfa VG |
1376 | if (ctx->fudptr) |
1377 | *ctx->fudptr = fud; | |
bafa9654 | 1378 | mutex_unlock(&fuse_mutex); |
0cc2656c SH |
1379 | return 0; |
1380 | ||
1381 | err_unlock: | |
1382 | mutex_unlock(&fuse_mutex); | |
1383 | dput(root_dentry); | |
1384 | err_dev_free: | |
7fd3abfa VG |
1385 | if (fud) |
1386 | fuse_dev_free(fud); | |
1dd53957 VG |
1387 | err_free_dax: |
1388 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
1389 | fuse_dax_conn_free(fc); | |
0cc2656c SH |
1390 | err: |
1391 | return err; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(fuse_fill_super_common); | |
1394 | ||
1395 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) | |
1396 | { | |
1397 | struct fuse_fs_context *ctx = fsc->fs_private; | |
1398 | struct file *file; | |
1399 | int err; | |
1400 | struct fuse_conn *fc; | |
fcee216b | 1401 | struct fuse_mount *fm; |
0cc2656c SH |
1402 | |
1403 | err = -EINVAL; | |
1404 | file = fget(ctx->fd); | |
1405 | if (!file) | |
1406 | goto err; | |
1407 | ||
1408 | /* | |
1409 | * Require mount to happen from the same user namespace which | |
1410 | * opened /dev/fuse to prevent potential attacks. | |
1411 | */ | |
1412 | if ((file->f_op != &fuse_dev_operations) || | |
1413 | (file->f_cred->user_ns != sb->s_user_ns)) | |
1414 | goto err_fput; | |
1415 | ctx->fudptr = &file->private_data; | |
1416 | ||
1417 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); | |
1418 | err = -ENOMEM; | |
1419 | if (!fc) | |
1420 | goto err_fput; | |
1421 | ||
fcee216b MR |
1422 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); |
1423 | if (!fm) { | |
1424 | kfree(fc); | |
1425 | goto err_fput; | |
1426 | } | |
1427 | ||
1428 | fuse_conn_init(fc, fm, sb->s_user_ns, &fuse_dev_fiq_ops, NULL); | |
0cc2656c | 1429 | fc->release = fuse_free_conn; |
fcee216b MR |
1430 | |
1431 | sb->s_fs_info = fm; | |
0cc2656c SH |
1432 | |
1433 | err = fuse_fill_super_common(sb, ctx); | |
1434 | if (err) | |
1435 | goto err_put_conn; | |
0720b315 MS |
1436 | /* |
1437 | * atomic_dec_and_test() in fput() provides the necessary | |
1438 | * memory barrier for file->private_data to be visible on all | |
1439 | * CPUs after this | |
1440 | */ | |
1441 | fput(file); | |
fcee216b | 1442 | fuse_send_init(get_fuse_mount_super(sb)); |
d8a5ba45 MS |
1443 | return 0; |
1444 | ||
c2b8f006 | 1445 | err_put_conn: |
fcee216b | 1446 | fuse_mount_put(fm); |
543b8f86 | 1447 | sb->s_fs_info = NULL; |
c2b8f006 MS |
1448 | err_fput: |
1449 | fput(file); | |
1450 | err: | |
d8a5ba45 MS |
1451 | return err; |
1452 | } | |
1453 | ||
c30da2e9 | 1454 | static int fuse_get_tree(struct fs_context *fc) |
d8a5ba45 | 1455 | { |
c30da2e9 DH |
1456 | struct fuse_fs_context *ctx = fc->fs_private; |
1457 | ||
1458 | if (!ctx->fd_present || !ctx->rootmode_present || | |
1459 | !ctx->user_id_present || !ctx->group_id_present) | |
1460 | return -EINVAL; | |
1461 | ||
1462 | #ifdef CONFIG_BLOCK | |
1463 | if (ctx->is_bdev) | |
1464 | return get_tree_bdev(fc, fuse_fill_super); | |
1465 | #endif | |
1466 | ||
1467 | return get_tree_nodev(fc, fuse_fill_super); | |
1468 | } | |
1469 | ||
1470 | static const struct fs_context_operations fuse_context_ops = { | |
1471 | .free = fuse_free_fc, | |
1472 | .parse_param = fuse_parse_param, | |
0189a2d3 | 1473 | .reconfigure = fuse_reconfigure, |
c30da2e9 DH |
1474 | .get_tree = fuse_get_tree, |
1475 | }; | |
1476 | ||
1477 | /* | |
1478 | * Set up the filesystem mount context. | |
1479 | */ | |
1480 | static int fuse_init_fs_context(struct fs_context *fc) | |
1481 | { | |
1482 | struct fuse_fs_context *ctx; | |
1483 | ||
1484 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1485 | if (!ctx) | |
1486 | return -ENOMEM; | |
1487 | ||
1488 | ctx->max_read = ~0; | |
1489 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
f4fd4ae3 | 1490 | ctx->legacy_opts_show = true; |
c30da2e9 DH |
1491 | |
1492 | #ifdef CONFIG_BLOCK | |
783863d6 | 1493 | if (fc->fs_type == &fuseblk_fs_type) { |
c30da2e9 | 1494 | ctx->is_bdev = true; |
783863d6 MS |
1495 | ctx->destroy = true; |
1496 | } | |
c30da2e9 DH |
1497 | #endif |
1498 | ||
1499 | fc->fs_private = ctx; | |
1500 | fc->ops = &fuse_context_ops; | |
1501 | return 0; | |
d8a5ba45 MS |
1502 | } |
1503 | ||
fcee216b | 1504 | bool fuse_mount_remove(struct fuse_mount *fm) |
3b463ae0 | 1505 | { |
fcee216b MR |
1506 | struct fuse_conn *fc = fm->fc; |
1507 | bool last = false; | |
3b463ae0 | 1508 | |
fcee216b MR |
1509 | down_write(&fc->killsb); |
1510 | list_del_init(&fm->fc_entry); | |
1511 | if (list_empty(&fc->mounts)) | |
1512 | last = true; | |
1513 | up_write(&fc->killsb); | |
e8f3bd77 | 1514 | |
fcee216b MR |
1515 | return last; |
1516 | } | |
1517 | EXPORT_SYMBOL_GPL(fuse_mount_remove); | |
e8f3bd77 | 1518 | |
fcee216b MR |
1519 | void fuse_conn_destroy(struct fuse_mount *fm) |
1520 | { | |
1521 | struct fuse_conn *fc = fm->fc; | |
1522 | ||
1523 | if (fc->destroy) | |
1524 | fuse_send_destroy(fm); | |
1525 | ||
1526 | fuse_abort_conn(fc); | |
1527 | fuse_wait_aborted(fc); | |
e8f3bd77 | 1528 | } |
fcee216b | 1529 | EXPORT_SYMBOL_GPL(fuse_conn_destroy); |
3b463ae0 | 1530 | |
fcee216b | 1531 | static void fuse_kill_sb_anon(struct super_block *sb) |
e8f3bd77 | 1532 | { |
fcee216b MR |
1533 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1534 | bool last; | |
1535 | ||
1536 | if (fm) { | |
1537 | last = fuse_mount_remove(fm); | |
1538 | if (last) | |
1539 | fuse_conn_destroy(fm); | |
1540 | } | |
3b463ae0 JM |
1541 | kill_anon_super(sb); |
1542 | } | |
1543 | ||
875d95ec MS |
1544 | static struct file_system_type fuse_fs_type = { |
1545 | .owner = THIS_MODULE, | |
1546 | .name = "fuse", | |
4ad769f3 | 1547 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 | 1548 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1549 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1550 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1551 | }; |
7f78e035 | 1552 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1553 | |
1554 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1555 | static void fuse_kill_sb_blk(struct super_block *sb) |
1556 | { | |
fcee216b MR |
1557 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1558 | bool last; | |
1559 | ||
1560 | if (fm) { | |
1561 | last = fuse_mount_remove(fm); | |
1562 | if (last) | |
1563 | fuse_conn_destroy(fm); | |
1564 | } | |
3b463ae0 JM |
1565 | kill_block_super(sb); |
1566 | } | |
1567 | ||
d6392f87 MS |
1568 | static struct file_system_type fuseblk_fs_type = { |
1569 | .owner = THIS_MODULE, | |
1570 | .name = "fuseblk", | |
c30da2e9 | 1571 | .init_fs_context = fuse_init_fs_context, |
d7167b14 | 1572 | .parameters = fuse_fs_parameters, |
3b463ae0 | 1573 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1574 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1575 | }; |
7f78e035 | 1576 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1577 | |
875d95ec MS |
1578 | static inline int register_fuseblk(void) |
1579 | { | |
1580 | return register_filesystem(&fuseblk_fs_type); | |
1581 | } | |
1582 | ||
1583 | static inline void unregister_fuseblk(void) | |
1584 | { | |
1585 | unregister_filesystem(&fuseblk_fs_type); | |
1586 | } | |
1587 | #else | |
1588 | static inline int register_fuseblk(void) | |
1589 | { | |
1590 | return 0; | |
1591 | } | |
1592 | ||
1593 | static inline void unregister_fuseblk(void) | |
1594 | { | |
1595 | } | |
1596 | #endif | |
1597 | ||
51cc5068 | 1598 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1599 | { |
1729a16c | 1600 | struct inode *inode = foo; |
d8a5ba45 | 1601 | |
a35afb83 | 1602 | inode_init_once(inode); |
d8a5ba45 MS |
1603 | } |
1604 | ||
1605 | static int __init fuse_fs_init(void) | |
1606 | { | |
1607 | int err; | |
1608 | ||
d6392f87 | 1609 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1610 | sizeof(struct fuse_inode), 0, |
1611 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1612 | fuse_inode_init_once); | |
d6392f87 MS |
1613 | err = -ENOMEM; |
1614 | if (!fuse_inode_cachep) | |
988f0325 AV |
1615 | goto out; |
1616 | ||
1617 | err = register_fuseblk(); | |
1618 | if (err) | |
1619 | goto out2; | |
1620 | ||
1621 | err = register_filesystem(&fuse_fs_type); | |
1622 | if (err) | |
1623 | goto out3; | |
d6392f87 MS |
1624 | |
1625 | return 0; | |
d8a5ba45 | 1626 | |
988f0325 | 1627 | out3: |
875d95ec | 1628 | unregister_fuseblk(); |
988f0325 AV |
1629 | out2: |
1630 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1631 | out: |
d8a5ba45 MS |
1632 | return err; |
1633 | } | |
1634 | ||
1635 | static void fuse_fs_cleanup(void) | |
1636 | { | |
1637 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1638 | unregister_fuseblk(); |
8c0a8537 KS |
1639 | |
1640 | /* | |
1641 | * Make sure all delayed rcu free inodes are flushed before we | |
1642 | * destroy cache. | |
1643 | */ | |
1644 | rcu_barrier(); | |
d8a5ba45 MS |
1645 | kmem_cache_destroy(fuse_inode_cachep); |
1646 | } | |
1647 | ||
5c89e17e | 1648 | static struct kobject *fuse_kobj; |
5c89e17e | 1649 | |
f543f253 MS |
1650 | static int fuse_sysfs_init(void) |
1651 | { | |
1652 | int err; | |
1653 | ||
00d26666 | 1654 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1655 | if (!fuse_kobj) { |
1656 | err = -ENOMEM; | |
f543f253 | 1657 | goto out_err; |
5c89e17e | 1658 | } |
f543f253 | 1659 | |
f9bb4882 EB |
1660 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1661 | if (err) | |
f543f253 MS |
1662 | goto out_fuse_unregister; |
1663 | ||
1664 | return 0; | |
1665 | ||
1666 | out_fuse_unregister: | |
197b12d6 | 1667 | kobject_put(fuse_kobj); |
f543f253 MS |
1668 | out_err: |
1669 | return err; | |
1670 | } | |
1671 | ||
1672 | static void fuse_sysfs_cleanup(void) | |
1673 | { | |
f9bb4882 | 1674 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1675 | kobject_put(fuse_kobj); |
f543f253 MS |
1676 | } |
1677 | ||
d8a5ba45 MS |
1678 | static int __init fuse_init(void) |
1679 | { | |
1680 | int res; | |
1681 | ||
f2294482 KS |
1682 | pr_info("init (API version %i.%i)\n", |
1683 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1684 | |
bafa9654 | 1685 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1686 | res = fuse_fs_init(); |
1687 | if (res) | |
1688 | goto err; | |
1689 | ||
334f485d MS |
1690 | res = fuse_dev_init(); |
1691 | if (res) | |
1692 | goto err_fs_cleanup; | |
1693 | ||
f543f253 MS |
1694 | res = fuse_sysfs_init(); |
1695 | if (res) | |
1696 | goto err_dev_cleanup; | |
1697 | ||
bafa9654 MS |
1698 | res = fuse_ctl_init(); |
1699 | if (res) | |
1700 | goto err_sysfs_cleanup; | |
1701 | ||
487ea5af CH |
1702 | sanitize_global_limit(&max_user_bgreq); |
1703 | sanitize_global_limit(&max_user_congthresh); | |
1704 | ||
d8a5ba45 MS |
1705 | return 0; |
1706 | ||
bafa9654 MS |
1707 | err_sysfs_cleanup: |
1708 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1709 | err_dev_cleanup: |
1710 | fuse_dev_cleanup(); | |
334f485d MS |
1711 | err_fs_cleanup: |
1712 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1713 | err: |
1714 | return res; | |
1715 | } | |
1716 | ||
1717 | static void __exit fuse_exit(void) | |
1718 | { | |
f2294482 | 1719 | pr_debug("exit\n"); |
d8a5ba45 | 1720 | |
bafa9654 | 1721 | fuse_ctl_cleanup(); |
f543f253 | 1722 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1723 | fuse_fs_cleanup(); |
334f485d | 1724 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1725 | } |
1726 | ||
1727 | module_init(fuse_init); | |
1728 | module_exit(fuse_exit); |