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 | ||
67 | struct fuse_fs_context { | |
68 | const char *subtype; | |
69 | bool is_bdev; | |
d8a5ba45 MS |
70 | int fd; |
71 | unsigned rootmode; | |
499dcf20 EB |
72 | kuid_t user_id; |
73 | kgid_t group_id; | |
1729a16c MS |
74 | unsigned fd_present:1; |
75 | unsigned rootmode_present:1; | |
76 | unsigned user_id_present:1; | |
77 | unsigned group_id_present:1; | |
29433a29 MS |
78 | unsigned default_permissions:1; |
79 | unsigned allow_other:1; | |
db50b96c | 80 | unsigned max_read; |
d8091614 | 81 | unsigned blksize; |
d8a5ba45 MS |
82 | }; |
83 | ||
a2daff68 | 84 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
85 | { |
86 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
87 | } | |
88 | ||
d8a5ba45 MS |
89 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
90 | { | |
d8a5ba45 MS |
91 | struct fuse_inode *fi; |
92 | ||
9031a69c | 93 | fi = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
94 | if (!fi) | |
d8a5ba45 MS |
95 | return NULL; |
96 | ||
0a0898cf | 97 | fi->i_time = 0; |
2f1e8196 | 98 | fi->inval_mask = 0; |
d8a5ba45 | 99 | fi->nodeid = 0; |
9e6268db | 100 | fi->nlookup = 0; |
fbee36b9 | 101 | fi->attr_version = 0; |
45c72cd7 | 102 | fi->orig_ino = 0; |
4582a4ab | 103 | fi->state = 0; |
5c672ab3 | 104 | mutex_init(&fi->mutex); |
f15ecfef | 105 | spin_lock_init(&fi->lock); |
07e77dca MS |
106 | fi->forget = fuse_alloc_forget(); |
107 | if (!fi->forget) { | |
9031a69c | 108 | kmem_cache_free(fuse_inode_cachep, fi); |
e5e5558e MS |
109 | return NULL; |
110 | } | |
d8a5ba45 | 111 | |
9031a69c | 112 | return &fi->inode; |
d8a5ba45 MS |
113 | } |
114 | ||
9baf28bb | 115 | static void fuse_free_inode(struct inode *inode) |
d8a5ba45 | 116 | { |
e5e5558e | 117 | struct fuse_inode *fi = get_fuse_inode(inode); |
9baf28bb | 118 | |
5c672ab3 | 119 | mutex_destroy(&fi->mutex); |
07e77dca | 120 | kfree(fi->forget); |
9baf28bb | 121 | kmem_cache_free(fuse_inode_cachep, fi); |
d8a5ba45 MS |
122 | } |
123 | ||
b57922d9 | 124 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 125 | { |
9baf28bb AV |
126 | struct fuse_inode *fi = get_fuse_inode(inode); |
127 | ||
91b0abe3 | 128 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 129 | clear_inode(inode); |
1751e8a6 | 130 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 131 | struct fuse_conn *fc = get_fuse_conn(inode); |
07e77dca MS |
132 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
133 | fi->forget = NULL; | |
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 | ||
71421259 MS |
141 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
142 | { | |
02b9984d | 143 | sync_filesystem(sb); |
1751e8a6 | 144 | if (*flags & SB_MANDLOCK) |
71421259 MS |
145 | return -EINVAL; |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
45c72cd7 PS |
150 | /* |
151 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
152 | * so that it will fit. | |
153 | */ | |
154 | static ino_t fuse_squash_ino(u64 ino64) | |
155 | { | |
156 | ino_t ino = (ino_t) ino64; | |
157 | if (sizeof(ino_t) < sizeof(u64)) | |
158 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
159 | return ino; | |
160 | } | |
161 | ||
3be5a52b MS |
162 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
163 | u64 attr_valid) | |
d8a5ba45 | 164 | { |
9ffbb916 | 165 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 166 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 167 | |
f15ecfef KT |
168 | lockdep_assert_held(&fi->lock); |
169 | ||
4510d86f | 170 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
1fb69e78 | 171 | fi->i_time = attr_valid; |
2f1e8196 | 172 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 173 | |
45c72cd7 | 174 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 175 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 176 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
177 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
178 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 MS |
179 | inode->i_blocks = attr->blocks; |
180 | inode->i_atime.tv_sec = attr->atime; | |
181 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
182 | /* mtime from server may be stale due to local buffered write */ |
183 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
184 | inode->i_mtime.tv_sec = attr->mtime; | |
185 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
186 | inode->i_ctime.tv_sec = attr->ctime; |
187 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 188 | } |
e00d2c2d | 189 | |
0e9663ee MS |
190 | if (attr->blksize != 0) |
191 | inode->i_blkbits = ilog2(attr->blksize); | |
192 | else | |
193 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
194 | ||
ebc14c4d MS |
195 | /* |
196 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
197 | * to check permissions. This prevents failures due to the | |
198 | * check in may_delete(). | |
199 | */ | |
200 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 201 | if (!fc->default_permissions) |
ebc14c4d | 202 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
203 | |
204 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
205 | } |
206 | ||
207 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
208 | u64 attr_valid, u64 attr_version) | |
209 | { | |
210 | struct fuse_conn *fc = get_fuse_conn(inode); | |
211 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 212 | bool is_wb = fc->writeback_cache; |
3be5a52b | 213 | loff_t oldsize; |
a64ba10f | 214 | struct timespec64 old_mtime; |
3be5a52b | 215 | |
f15ecfef | 216 | spin_lock(&fi->lock); |
06a7c3c2 MP |
217 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
218 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 219 | spin_unlock(&fi->lock); |
3be5a52b MS |
220 | return; |
221 | } | |
222 | ||
a64ba10f | 223 | old_mtime = inode->i_mtime; |
3be5a52b | 224 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 225 | |
e00d2c2d | 226 | oldsize = inode->i_size; |
8373200b PE |
227 | /* |
228 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
229 | * extend local i_size without keeping userspace server in sync. So, | |
230 | * attr->size coming from server can be stale. We cannot trust it. | |
231 | */ | |
232 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
233 | i_size_write(inode, attr->size); | |
f15ecfef | 234 | spin_unlock(&fi->lock); |
e00d2c2d | 235 | |
8373200b | 236 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
237 | bool inval = false; |
238 | ||
239 | if (oldsize != attr->size) { | |
7caef267 | 240 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
241 | if (!fc->explicit_inval_data) |
242 | inval = true; | |
eed2179e | 243 | } else if (fc->auto_inval_data) { |
a64ba10f | 244 | struct timespec64 new_mtime = { |
eed2179e BF |
245 | .tv_sec = attr->mtime, |
246 | .tv_nsec = attr->mtimensec, | |
247 | }; | |
248 | ||
249 | /* | |
250 | * Auto inval mode also checks and invalidates if mtime | |
251 | * has changed. | |
252 | */ | |
a64ba10f | 253 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
254 | inval = true; |
255 | } | |
256 | ||
257 | if (inval) | |
258 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 259 | } |
d8a5ba45 MS |
260 | } |
261 | ||
262 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
263 | { | |
264 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 265 | inode->i_size = attr->size; |
b0aa7606 MP |
266 | inode->i_mtime.tv_sec = attr->mtime; |
267 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
268 | inode->i_ctime.tv_sec = attr->ctime; |
269 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
270 | if (S_ISREG(inode->i_mode)) { |
271 | fuse_init_common(inode); | |
b6aeaded | 272 | fuse_init_file_inode(inode); |
e5e5558e MS |
273 | } else if (S_ISDIR(inode->i_mode)) |
274 | fuse_init_dir(inode); | |
275 | else if (S_ISLNK(inode->i_mode)) | |
276 | fuse_init_symlink(inode); | |
277 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
278 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
279 | fuse_init_common(inode); | |
280 | init_special_inode(inode, inode->i_mode, | |
281 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
282 | } else |
283 | BUG(); | |
d8a5ba45 MS |
284 | } |
285 | ||
3b463ae0 | 286 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 287 | { |
b48badf0 | 288 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
289 | if (get_node_id(inode) == nodeid) |
290 | return 1; | |
291 | else | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
296 | { | |
b48badf0 | 297 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
298 | get_fuse_inode(inode)->nodeid = nodeid; |
299 | return 0; | |
300 | } | |
301 | ||
b48badf0 | 302 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
303 | int generation, struct fuse_attr *attr, |
304 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
305 | { |
306 | struct inode *inode; | |
9e6268db | 307 | struct fuse_inode *fi; |
d8a5ba45 | 308 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
309 | |
310 | retry: | |
311 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
312 | if (!inode) | |
313 | return NULL; | |
314 | ||
315 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 316 | inode->i_flags |= S_NOATIME; |
d31433c8 | 317 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 318 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 319 | inode->i_generation = generation; |
d8a5ba45 MS |
320 | fuse_init_inode(inode, attr); |
321 | unlock_new_inode(inode); | |
322 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
323 | /* Inode has changed type, any I/O on the old should fail */ |
324 | make_bad_inode(inode); | |
325 | iput(inode); | |
d8a5ba45 MS |
326 | goto retry; |
327 | } | |
328 | ||
9e6268db | 329 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 330 | spin_lock(&fi->lock); |
1729a16c | 331 | fi->nlookup++; |
c9d8f5f0 | 332 | spin_unlock(&fi->lock); |
1fb69e78 MS |
333 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
334 | ||
d8a5ba45 MS |
335 | return inode; |
336 | } | |
337 | ||
3b463ae0 JM |
338 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
339 | loff_t offset, loff_t len) | |
340 | { | |
341 | struct inode *inode; | |
342 | pgoff_t pg_start; | |
343 | pgoff_t pg_end; | |
344 | ||
345 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
346 | if (!inode) | |
347 | return -ENOENT; | |
348 | ||
349 | fuse_invalidate_attr(inode); | |
60bcc88a | 350 | forget_all_cached_acls(inode); |
3b463ae0 | 351 | if (offset >= 0) { |
09cbfeaf | 352 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
353 | if (len <= 0) |
354 | pg_end = -1; | |
355 | else | |
09cbfeaf | 356 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
357 | invalidate_inode_pages2_range(inode->i_mapping, |
358 | pg_start, pg_end); | |
359 | } | |
360 | iput(inode); | |
361 | return 0; | |
362 | } | |
363 | ||
63576c13 | 364 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 365 | { |
63576c13 MS |
366 | bool locked = false; |
367 | ||
368 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 369 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
370 | locked = true; |
371 | } | |
372 | ||
373 | return locked; | |
5c672ab3 MS |
374 | } |
375 | ||
63576c13 | 376 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 377 | { |
63576c13 | 378 | if (locked) |
5c672ab3 MS |
379 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
380 | } | |
381 | ||
42faad99 | 382 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 383 | { |
eb98e3bd | 384 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
385 | } |
386 | ||
0ec7ca41 MS |
387 | static void fuse_send_destroy(struct fuse_conn *fc) |
388 | { | |
389 | struct fuse_req *req = fc->destroy_req; | |
390 | if (req && fc->conn_init) { | |
391 | fc->destroy_req = NULL; | |
392 | req->in.h.opcode = FUSE_DESTROY; | |
825d6d33 MS |
393 | __set_bit(FR_FORCE, &req->flags); |
394 | __clear_bit(FR_BACKGROUND, &req->flags); | |
b93f858a | 395 | fuse_request_send(fc, req); |
0ec7ca41 MS |
396 | fuse_put_request(fc, req); |
397 | } | |
398 | } | |
399 | ||
a325f9b9 TH |
400 | static void fuse_put_super(struct super_block *sb) |
401 | { | |
402 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
403 | ||
bbd99797 MS |
404 | mutex_lock(&fuse_mutex); |
405 | list_del(&fc->entry); | |
406 | fuse_ctl_remove_conn(fc); | |
407 | mutex_unlock(&fuse_mutex); | |
bbd99797 | 408 | |
bafa9654 | 409 | fuse_conn_put(fc); |
d8a5ba45 MS |
410 | } |
411 | ||
e5e5558e MS |
412 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
413 | { | |
414 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
415 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 416 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
417 | stbuf->f_blocks = attr->blocks; |
418 | stbuf->f_bfree = attr->bfree; | |
419 | stbuf->f_bavail = attr->bavail; | |
420 | stbuf->f_files = attr->files; | |
421 | stbuf->f_ffree = attr->ffree; | |
422 | stbuf->f_namelen = attr->namelen; | |
423 | /* fsid is left zero */ | |
424 | } | |
425 | ||
726c3342 | 426 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 427 | { |
726c3342 | 428 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 429 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 430 | FUSE_ARGS(args); |
e5e5558e MS |
431 | struct fuse_statfs_out outarg; |
432 | int err; | |
433 | ||
c2132c1b | 434 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
435 | buf->f_type = FUSE_SUPER_MAGIC; |
436 | return 0; | |
437 | } | |
438 | ||
de5f1202 | 439 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
440 | args.in.numargs = 0; |
441 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 442 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 443 | args.out.numargs = 1; |
21f62174 | 444 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
445 | args.out.args[0].value = &outarg; |
446 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
447 | if (!err) |
448 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
449 | return err; |
450 | } | |
451 | ||
d8a5ba45 | 452 | enum { |
c30da2e9 DH |
453 | OPT_SOURCE, |
454 | OPT_SUBTYPE, | |
d8a5ba45 MS |
455 | OPT_FD, |
456 | OPT_ROOTMODE, | |
457 | OPT_USER_ID, | |
87729a55 | 458 | OPT_GROUP_ID, |
d8a5ba45 MS |
459 | OPT_DEFAULT_PERMISSIONS, |
460 | OPT_ALLOW_OTHER, | |
db50b96c | 461 | OPT_MAX_READ, |
d8091614 | 462 | OPT_BLKSIZE, |
d8a5ba45 MS |
463 | OPT_ERR |
464 | }; | |
465 | ||
c30da2e9 DH |
466 | static const struct fs_parameter_spec fuse_param_specs[] = { |
467 | fsparam_string ("source", OPT_SOURCE), | |
468 | fsparam_u32 ("fd", OPT_FD), | |
469 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
470 | fsparam_u32 ("user_id", OPT_USER_ID), | |
471 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
472 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
473 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
474 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
475 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 476 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
477 | {} |
478 | }; | |
479 | ||
480 | static const struct fs_parameter_description fuse_fs_parameters = { | |
481 | .name = "fuse", | |
482 | .specs = fuse_param_specs, | |
d8a5ba45 MS |
483 | }; |
484 | ||
c30da2e9 | 485 | static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param) |
233a01fa | 486 | { |
c30da2e9 DH |
487 | struct fs_parse_result result; |
488 | struct fuse_fs_context *ctx = fc->fs_private; | |
489 | int opt; | |
490 | ||
491 | opt = fs_parse(fc, &fuse_fs_parameters, param, &result); | |
492 | if (opt < 0) | |
493 | return opt; | |
494 | ||
495 | switch (opt) { | |
496 | case OPT_SOURCE: | |
497 | if (fc->source) | |
498 | return invalf(fc, "fuse: Multiple sources specified"); | |
499 | fc->source = param->string; | |
500 | param->string = NULL; | |
501 | break; | |
502 | ||
503 | case OPT_SUBTYPE: | |
504 | if (ctx->subtype) | |
505 | return invalf(fc, "fuse: Multiple subtypes specified"); | |
506 | ctx->subtype = param->string; | |
507 | param->string = NULL; | |
508 | return 0; | |
509 | ||
510 | case OPT_FD: | |
511 | ctx->fd = result.uint_32; | |
512 | ctx->fd_present = 1; | |
513 | break; | |
514 | ||
515 | case OPT_ROOTMODE: | |
516 | if (!fuse_valid_type(result.uint_32)) | |
517 | return invalf(fc, "fuse: Invalid rootmode"); | |
518 | ctx->rootmode = result.uint_32; | |
519 | ctx->rootmode_present = 1; | |
520 | break; | |
521 | ||
522 | case OPT_USER_ID: | |
523 | ctx->user_id = make_kuid(fc->user_ns, result.uint_32); | |
524 | if (!uid_valid(ctx->user_id)) | |
525 | return invalf(fc, "fuse: Invalid user_id"); | |
526 | ctx->user_id_present = 1; | |
527 | break; | |
528 | ||
529 | case OPT_GROUP_ID: | |
530 | ctx->group_id = make_kgid(fc->user_ns, result.uint_32); | |
531 | if (!gid_valid(ctx->group_id)) | |
532 | return invalf(fc, "fuse: Invalid group_id"); | |
533 | ctx->group_id_present = 1; | |
534 | break; | |
535 | ||
536 | case OPT_DEFAULT_PERMISSIONS: | |
537 | ctx->default_permissions = 1; | |
538 | break; | |
539 | ||
540 | case OPT_ALLOW_OTHER: | |
541 | ctx->allow_other = 1; | |
542 | break; | |
543 | ||
544 | case OPT_MAX_READ: | |
545 | ctx->max_read = result.uint_32; | |
546 | break; | |
547 | ||
548 | case OPT_BLKSIZE: | |
549 | if (!ctx->is_bdev) | |
550 | return invalf(fc, "fuse: blksize only supported for fuseblk"); | |
551 | ctx->blksize = result.uint_32; | |
552 | break; | |
553 | ||
554 | default: | |
555 | return -EINVAL; | |
233a01fa | 556 | } |
c30da2e9 DH |
557 | |
558 | return 0; | |
233a01fa MS |
559 | } |
560 | ||
c30da2e9 | 561 | static void fuse_free_fc(struct fs_context *fc) |
d8a5ba45 | 562 | { |
c30da2e9 | 563 | struct fuse_fs_context *ctx = fc->fs_private; |
5a533682 | 564 | |
c30da2e9 DH |
565 | if (ctx) { |
566 | kfree(ctx->subtype); | |
567 | kfree(ctx); | |
568 | } | |
d8a5ba45 MS |
569 | } |
570 | ||
34c80b1d | 571 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 572 | { |
34c80b1d AV |
573 | struct super_block *sb = root->d_sb; |
574 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 575 | |
8cb08329 EB |
576 | seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id)); |
577 | seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id)); | |
29433a29 | 578 | if (fc->default_permissions) |
1e9a4ed9 | 579 | seq_puts(m, ",default_permissions"); |
29433a29 | 580 | if (fc->allow_other) |
1e9a4ed9 | 581 | seq_puts(m, ",allow_other"); |
db50b96c MS |
582 | if (fc->max_read != ~0) |
583 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
584 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
585 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
586 | return 0; |
587 | } | |
588 | ||
f88996a9 MS |
589 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
590 | { | |
591 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
592 | init_waitqueue_head(&fiq->waitq); | |
593 | INIT_LIST_HEAD(&fiq->pending); | |
594 | INIT_LIST_HEAD(&fiq->interrupts); | |
595 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 596 | fiq->connected = 1; |
f88996a9 MS |
597 | } |
598 | ||
3a2b5b9c MS |
599 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
600 | { | |
be2ff42c KT |
601 | unsigned int i; |
602 | ||
45a91cb1 | 603 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
604 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
605 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 606 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 607 | fpq->connected = 1; |
3a2b5b9c MS |
608 | } |
609 | ||
8cb08329 | 610 | void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns) |
d8a5ba45 | 611 | { |
0d179aa5 TH |
612 | memset(fc, 0, sizeof(*fc)); |
613 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 614 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 615 | init_rwsem(&fc->killsb); |
095fc40a | 616 | refcount_set(&fc->count, 1); |
c3696046 | 617 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
618 | init_waitqueue_head(&fc->blocked_waitq); |
619 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 620 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
621 | INIT_LIST_HEAD(&fc->bg_queue); |
622 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 623 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 624 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
625 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
626 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 627 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 628 | fc->polled_files = RB_ROOT; |
0aada884 | 629 | fc->blocked = 0; |
796523fb | 630 | fc->initialized = 0; |
e16714d8 | 631 | fc->connected = 1; |
4510d86f | 632 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 633 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 634 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 635 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 636 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
d8a5ba45 | 637 | } |
0d179aa5 | 638 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 639 | |
bafa9654 MS |
640 | void fuse_conn_put(struct fuse_conn *fc) |
641 | { | |
095fc40a | 642 | if (refcount_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
643 | if (fc->destroy_req) |
644 | fuse_request_free(fc->destroy_req); | |
0b6e9ea0 | 645 | put_pid_ns(fc->pid_ns); |
8cb08329 | 646 | put_user_ns(fc->user_ns); |
43901aab | 647 | fc->release(fc); |
d2a85164 | 648 | } |
bafa9654 | 649 | } |
08cbf542 | 650 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
651 | |
652 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
653 | { | |
095fc40a | 654 | refcount_inc(&fc->count); |
bafa9654 MS |
655 | return fc; |
656 | } | |
08cbf542 | 657 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 658 | |
b93f858a | 659 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
660 | { |
661 | struct fuse_attr attr; | |
662 | memset(&attr, 0, sizeof(attr)); | |
663 | ||
664 | attr.mode = mode; | |
665 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 666 | attr.nlink = 1; |
1fb69e78 | 667 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
668 | } |
669 | ||
1729a16c | 670 | struct fuse_inode_handle { |
dbd561d2 MS |
671 | u64 nodeid; |
672 | u32 generation; | |
673 | }; | |
674 | ||
675 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
676 | struct fuse_inode_handle *handle) | |
677 | { | |
33670fa2 | 678 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
679 | struct inode *inode; |
680 | struct dentry *entry; | |
681 | int err = -ESTALE; | |
682 | ||
683 | if (handle->nodeid == 0) | |
684 | goto out_err; | |
685 | ||
686 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
687 | if (!inode) { |
688 | struct fuse_entry_out outarg; | |
13983d06 | 689 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
690 | |
691 | if (!fc->export_support) | |
692 | goto out_err; | |
693 | ||
33670fa2 MS |
694 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
695 | &inode); | |
696 | if (err && err != -ENOENT) | |
697 | goto out_err; | |
698 | if (err || !inode) { | |
699 | err = -ESTALE; | |
700 | goto out_err; | |
701 | } | |
702 | err = -EIO; | |
703 | if (get_node_id(inode) != handle->nodeid) | |
704 | goto out_iput; | |
705 | } | |
dbd561d2 MS |
706 | err = -ESTALE; |
707 | if (inode->i_generation != handle->generation) | |
708 | goto out_iput; | |
709 | ||
44003728 | 710 | entry = d_obtain_alias(inode); |
c35eebe9 | 711 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 712 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
713 | |
714 | return entry; | |
715 | ||
716 | out_iput: | |
717 | iput(inode); | |
718 | out_err: | |
719 | return ERR_PTR(err); | |
720 | } | |
721 | ||
b0b0382b AV |
722 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
723 | struct inode *parent) | |
dbd561d2 | 724 | { |
b0b0382b | 725 | int len = parent ? 6 : 3; |
dbd561d2 MS |
726 | u64 nodeid; |
727 | u32 generation; | |
728 | ||
5fe0c237 AK |
729 | if (*max_len < len) { |
730 | *max_len = len; | |
94e07a75 | 731 | return FILEID_INVALID; |
5fe0c237 | 732 | } |
dbd561d2 MS |
733 | |
734 | nodeid = get_fuse_inode(inode)->nodeid; | |
735 | generation = inode->i_generation; | |
736 | ||
737 | fh[0] = (u32)(nodeid >> 32); | |
738 | fh[1] = (u32)(nodeid & 0xffffffff); | |
739 | fh[2] = generation; | |
740 | ||
b0b0382b | 741 | if (parent) { |
dbd561d2 MS |
742 | nodeid = get_fuse_inode(parent)->nodeid; |
743 | generation = parent->i_generation; | |
dbd561d2 MS |
744 | |
745 | fh[3] = (u32)(nodeid >> 32); | |
746 | fh[4] = (u32)(nodeid & 0xffffffff); | |
747 | fh[5] = generation; | |
748 | } | |
749 | ||
750 | *max_len = len; | |
b0b0382b | 751 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
752 | } |
753 | ||
754 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
755 | struct fid *fid, int fh_len, int fh_type) | |
756 | { | |
757 | struct fuse_inode_handle handle; | |
758 | ||
759 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
760 | return NULL; | |
761 | ||
762 | handle.nodeid = (u64) fid->raw[0] << 32; | |
763 | handle.nodeid |= (u64) fid->raw[1]; | |
764 | handle.generation = fid->raw[2]; | |
765 | return fuse_get_dentry(sb, &handle); | |
766 | } | |
767 | ||
768 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
769 | struct fid *fid, int fh_len, int fh_type) | |
770 | { | |
771 | struct fuse_inode_handle parent; | |
772 | ||
773 | if (fh_type != 0x82 || fh_len < 6) | |
774 | return NULL; | |
775 | ||
776 | parent.nodeid = (u64) fid->raw[3] << 32; | |
777 | parent.nodeid |= (u64) fid->raw[4]; | |
778 | parent.generation = fid->raw[5]; | |
779 | return fuse_get_dentry(sb, &parent); | |
780 | } | |
781 | ||
33670fa2 MS |
782 | static struct dentry *fuse_get_parent(struct dentry *child) |
783 | { | |
2b0143b5 | 784 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
785 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
786 | struct inode *inode; | |
787 | struct dentry *parent; | |
788 | struct fuse_entry_out outarg; | |
13983d06 | 789 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
790 | int err; |
791 | ||
792 | if (!fc->export_support) | |
793 | return ERR_PTR(-ESTALE); | |
794 | ||
33670fa2 MS |
795 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
796 | &name, &outarg, &inode); | |
44003728 CH |
797 | if (err) { |
798 | if (err == -ENOENT) | |
799 | return ERR_PTR(-ESTALE); | |
33670fa2 | 800 | return ERR_PTR(err); |
33670fa2 | 801 | } |
44003728 CH |
802 | |
803 | parent = d_obtain_alias(inode); | |
c35eebe9 | 804 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 805 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
806 | |
807 | return parent; | |
808 | } | |
dbd561d2 MS |
809 | |
810 | static const struct export_operations fuse_export_operations = { | |
811 | .fh_to_dentry = fuse_fh_to_dentry, | |
812 | .fh_to_parent = fuse_fh_to_parent, | |
813 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 814 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
815 | }; |
816 | ||
ee9b6d61 | 817 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 818 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 819 | .free_inode = fuse_free_inode, |
b57922d9 | 820 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 821 | .write_inode = fuse_write_inode, |
ead5f0b5 | 822 | .drop_inode = generic_delete_inode, |
71421259 | 823 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 824 | .put_super = fuse_put_super, |
69a53bf2 | 825 | .umount_begin = fuse_umount_begin, |
e5e5558e | 826 | .statfs = fuse_statfs, |
d8a5ba45 MS |
827 | .show_options = fuse_show_options, |
828 | }; | |
829 | ||
487ea5af CH |
830 | static void sanitize_global_limit(unsigned *limit) |
831 | { | |
832 | if (*limit == 0) | |
ca79b0c2 | 833 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / |
487ea5af CH |
834 | sizeof(struct fuse_req); |
835 | ||
836 | if (*limit >= 1 << 16) | |
837 | *limit = (1 << 16) - 1; | |
838 | } | |
839 | ||
e4dca7b7 | 840 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
841 | { |
842 | int rv; | |
843 | ||
844 | rv = param_set_uint(val, kp); | |
845 | if (rv) | |
846 | return rv; | |
847 | ||
848 | sanitize_global_limit((unsigned *)kp->arg); | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
854 | { | |
855 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
856 | ||
857 | if (arg->minor < 13) | |
858 | return; | |
859 | ||
860 | sanitize_global_limit(&max_user_bgreq); | |
861 | sanitize_global_limit(&max_user_congthresh); | |
862 | ||
ae2dffa3 | 863 | spin_lock(&fc->bg_lock); |
487ea5af CH |
864 | if (arg->max_background) { |
865 | fc->max_background = arg->max_background; | |
866 | ||
867 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
868 | fc->max_background = max_user_bgreq; | |
869 | } | |
870 | if (arg->congestion_threshold) { | |
871 | fc->congestion_threshold = arg->congestion_threshold; | |
872 | ||
873 | if (!cap_sys_admin && | |
874 | fc->congestion_threshold > max_user_congthresh) | |
875 | fc->congestion_threshold = max_user_congthresh; | |
876 | } | |
ae2dffa3 | 877 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
878 | } |
879 | ||
9b9a0469 MS |
880 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
881 | { | |
9b9a0469 MS |
882 | struct fuse_init_out *arg = &req->misc.init_out; |
883 | ||
884 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
885 | fc->conn_error = 1; | |
886 | else { | |
9cd68455 MS |
887 | unsigned long ra_pages; |
888 | ||
487ea5af CH |
889 | process_init_limits(fc, arg); |
890 | ||
9cd68455 | 891 | if (arg->minor >= 6) { |
09cbfeaf | 892 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
893 | if (arg->flags & FUSE_ASYNC_READ) |
894 | fc->async_read = 1; | |
71421259 MS |
895 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
896 | fc->no_lock = 1; | |
37fb3a30 MS |
897 | if (arg->minor >= 17) { |
898 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
899 | fc->no_flock = 1; | |
24114504 MS |
900 | } else { |
901 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
902 | fc->no_flock = 1; | |
37fb3a30 | 903 | } |
6ff958ed MS |
904 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
905 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
906 | if (arg->minor >= 9) { |
907 | /* LOOKUP has dependency on proto version */ | |
908 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
909 | fc->export_support = 1; | |
910 | } | |
78bb6cb9 MS |
911 | if (arg->flags & FUSE_BIG_WRITES) |
912 | fc->big_writes = 1; | |
e0a43ddc MS |
913 | if (arg->flags & FUSE_DONT_MASK) |
914 | fc->dont_mask = 1; | |
72d0d248 BF |
915 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
916 | fc->auto_inval_data = 1; | |
ad2ba64d KS |
917 | else if (arg->flags & FUSE_EXPLICIT_INVAL_DATA) |
918 | fc->explicit_inval_data = 1; | |
28420dad | 919 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 920 | fc->do_readdirplus = 1; |
28420dad MS |
921 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
922 | fc->readdirplus_auto = 1; | |
923 | } | |
60b9df7a MS |
924 | if (arg->flags & FUSE_ASYNC_DIO) |
925 | fc->async_dio = 1; | |
4d99ff8f PE |
926 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
927 | fc->writeback_cache = 1; | |
5c672ab3 MS |
928 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
929 | fc->parallel_dirops = 1; | |
5e940c1d MS |
930 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
931 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
932 | if (arg->time_gran && arg->time_gran <= 1000000000) |
933 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 934 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 935 | fc->default_permissions = 1; |
60bcc88a SF |
936 | fc->posix_acl = 1; |
937 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
938 | } | |
5571f1e6 DS |
939 | if (arg->flags & FUSE_CACHE_SYMLINKS) |
940 | fc->cache_symlinks = 1; | |
3b7008b2 SL |
941 | if (arg->flags & FUSE_ABORT_ERROR) |
942 | fc->abort_err = 1; | |
5da784cc CS |
943 | if (arg->flags & FUSE_MAX_PAGES) { |
944 | fc->max_pages = | |
945 | min_t(unsigned int, FUSE_MAX_MAX_PAGES, | |
946 | max_t(unsigned int, arg->max_pages, 1)); | |
947 | } | |
71421259 | 948 | } else { |
09cbfeaf | 949 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 950 | fc->no_lock = 1; |
37fb3a30 | 951 | fc->no_flock = 1; |
71421259 | 952 | } |
9cd68455 | 953 | |
5f7f7543 JK |
954 | fc->sb->s_bdi->ra_pages = |
955 | min(fc->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
956 | fc->minor = arg->minor; |
957 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 958 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 959 | fc->conn_init = 1; |
9b9a0469 | 960 | } |
9759bd51 | 961 | fuse_set_initialized(fc); |
08a53cdc | 962 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
963 | } |
964 | ||
ce1d5a49 | 965 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 966 | { |
9b9a0469 | 967 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 968 | |
9b9a0469 MS |
969 | arg->major = FUSE_KERNEL_VERSION; |
970 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
5f7f7543 | 971 | arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; |
78bb6cb9 | 972 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 973 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 974 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 975 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 976 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 977 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 978 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 979 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
ad2ba64d | 980 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA; |
9b9a0469 MS |
981 | req->in.h.opcode = FUSE_INIT; |
982 | req->in.numargs = 1; | |
983 | req->in.args[0].size = sizeof(*arg); | |
984 | req->in.args[0].value = arg; | |
985 | req->out.numargs = 1; | |
3ad2f3fb | 986 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
987 | with interface version < 7.5. Rest of init_out is zeroed |
988 | by do_get_request(), so a short reply is not a problem */ | |
989 | req->out.argvar = 1; | |
990 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
991 | req->out.args[0].value = &req->misc.init_out; | |
992 | req->end = process_init_reply; | |
b93f858a | 993 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
994 | } |
995 | ||
43901aab TH |
996 | static void fuse_free_conn(struct fuse_conn *fc) |
997 | { | |
cc080e9e | 998 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 999 | kfree_rcu(fc, rcu); |
43901aab TH |
1000 | } |
1001 | ||
a325f9b9 TH |
1002 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1003 | { | |
1004 | int err; | |
5f7f7543 | 1005 | char *suffix = ""; |
a325f9b9 | 1006 | |
69c8ebf8 | 1007 | if (sb->s_bdev) { |
5f7f7543 | 1008 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1009 | /* |
1010 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1011 | * it to our private bdi... | |
1012 | */ | |
1013 | bdi_put(sb->s_bdi); | |
1014 | sb->s_bdi = &noop_backing_dev_info; | |
1015 | } | |
5f7f7543 JK |
1016 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1017 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1018 | if (err) |
1019 | return err; | |
1020 | ||
b5420237 | 1021 | sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; |
5f7f7543 JK |
1022 | /* fuse does it's own writeback accounting */ |
1023 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1024 | |
a325f9b9 TH |
1025 | /* |
1026 | * For a single fuse filesystem use max 1% of dirty + | |
1027 | * writeback threshold. | |
1028 | * | |
1029 | * This gives about 1M of write buffer for memory maps on a | |
1030 | * machine with 1G and 10% dirty_ratio, which should be more | |
1031 | * than enough. | |
1032 | * | |
1033 | * Privileged users can raise it by writing to | |
1034 | * | |
1035 | * /sys/class/bdi/<bdi>/max_ratio | |
1036 | */ | |
5f7f7543 | 1037 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1038 | |
1039 | return 0; | |
1040 | } | |
1041 | ||
cc080e9e MS |
1042 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1043 | { | |
1044 | struct fuse_dev *fud; | |
be2ff42c | 1045 | struct list_head *pq; |
cc080e9e MS |
1046 | |
1047 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1048 | if (!fud) |
1049 | return NULL; | |
cc080e9e | 1050 | |
be2ff42c KT |
1051 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1052 | if (!pq) { | |
1053 | kfree(fud); | |
1054 | return NULL; | |
cc080e9e MS |
1055 | } |
1056 | ||
be2ff42c KT |
1057 | fud->pq.processing = pq; |
1058 | fud->fc = fuse_conn_get(fc); | |
1059 | fuse_pqueue_init(&fud->pq); | |
1060 | ||
1061 | spin_lock(&fc->lock); | |
1062 | list_add_tail(&fud->entry, &fc->devices); | |
1063 | spin_unlock(&fc->lock); | |
1064 | ||
cc080e9e MS |
1065 | return fud; |
1066 | } | |
1067 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1068 | ||
1069 | void fuse_dev_free(struct fuse_dev *fud) | |
1070 | { | |
1071 | struct fuse_conn *fc = fud->fc; | |
1072 | ||
1073 | if (fc) { | |
1074 | spin_lock(&fc->lock); | |
1075 | list_del(&fud->entry); | |
1076 | spin_unlock(&fc->lock); | |
1077 | ||
1078 | fuse_conn_put(fc); | |
1079 | } | |
d72f70da | 1080 | kfree(fud->pq.processing); |
cc080e9e MS |
1081 | kfree(fud); |
1082 | } | |
1083 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1084 | ||
c30da2e9 | 1085 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) |
d8a5ba45 | 1086 | { |
c30da2e9 | 1087 | struct fuse_fs_context *ctx = fsc->fs_private; |
cc080e9e | 1088 | struct fuse_dev *fud; |
d8a5ba45 MS |
1089 | struct fuse_conn *fc; |
1090 | struct inode *root; | |
d8a5ba45 | 1091 | struct file *file; |
f543f253 | 1092 | struct dentry *root_dentry; |
ce1d5a49 | 1093 | struct fuse_req *init_req; |
d8a5ba45 | 1094 | int err; |
d8091614 | 1095 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1096 | |
c2b8f006 | 1097 | err = -EINVAL; |
1751e8a6 | 1098 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1099 | goto err; |
71421259 | 1100 | |
1751e8a6 | 1101 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); |
9e1f1de0 | 1102 | |
d8091614 | 1103 | if (is_bdev) { |
875d95ec | 1104 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1105 | err = -EINVAL; |
c30da2e9 | 1106 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1107 | goto err; |
875d95ec | 1108 | #endif |
d8091614 | 1109 | } else { |
09cbfeaf KS |
1110 | sb->s_blocksize = PAGE_SIZE; |
1111 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1112 | } |
c30da2e9 DH |
1113 | |
1114 | sb->s_subtype = ctx->subtype; | |
1115 | ctx->subtype = NULL; | |
d8a5ba45 MS |
1116 | sb->s_magic = FUSE_SUPER_MAGIC; |
1117 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1118 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1119 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1120 | sb->s_time_gran = 1; |
dbd561d2 | 1121 | sb->s_export_op = &fuse_export_operations; |
0834136a MZ |
1122 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; |
1123 | if (sb->s_user_ns != &init_user_ns) | |
1124 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
d8a5ba45 | 1125 | |
c30da2e9 | 1126 | file = fget(ctx->fd); |
c2b8f006 | 1127 | err = -EINVAL; |
d8a5ba45 | 1128 | if (!file) |
c2b8f006 | 1129 | goto err; |
d8a5ba45 | 1130 | |
8cb08329 EB |
1131 | /* |
1132 | * Require mount to happen from the same user namespace which | |
1133 | * opened /dev/fuse to prevent potential attacks. | |
1134 | */ | |
1135 | if (file->f_op != &fuse_dev_operations || | |
1136 | file->f_cred->user_ns != sb->s_user_ns) | |
c2b8f006 | 1137 | goto err_fput; |
0720b315 | 1138 | |
e45b2546 EB |
1139 | /* |
1140 | * If we are not in the initial user namespace posix | |
1141 | * acls must be translated. | |
1142 | */ | |
1143 | if (sb->s_user_ns != &init_user_ns) | |
1144 | sb->s_xattr = fuse_no_acl_xattr_handlers; | |
1145 | ||
0d179aa5 | 1146 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1147 | err = -ENOMEM; |
1148 | if (!fc) | |
1149 | goto err_fput; | |
d8a5ba45 | 1150 | |
8cb08329 | 1151 | fuse_conn_init(fc, sb->s_user_ns); |
0ad0b325 | 1152 | fc->release = fuse_free_conn; |
a325f9b9 | 1153 | |
cc080e9e MS |
1154 | fud = fuse_dev_alloc(fc); |
1155 | if (!fud) | |
1156 | goto err_put_conn; | |
1157 | ||
a325f9b9 | 1158 | fc->dev = sb->s_dev; |
3b463ae0 | 1159 | fc->sb = sb; |
a325f9b9 TH |
1160 | err = fuse_bdi_init(fc, sb); |
1161 | if (err) | |
cc080e9e | 1162 | goto err_dev_free; |
0d179aa5 | 1163 | |
e0a43ddc | 1164 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1165 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1166 | fc->dont_mask = 1; |
1751e8a6 | 1167 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1168 | |
c30da2e9 DH |
1169 | fc->default_permissions = ctx->default_permissions; |
1170 | fc->allow_other = ctx->allow_other; | |
1171 | fc->user_id = ctx->user_id; | |
1172 | fc->group_id = ctx->group_id; | |
1173 | fc->max_read = max_t(unsigned, 4096, ctx->max_read); | |
d8a5ba45 | 1174 | |
f543f253 MS |
1175 | /* Used by get_root_inode() */ |
1176 | sb->s_fs_info = fc; | |
1177 | ||
d8a5ba45 | 1178 | err = -ENOMEM; |
c30da2e9 | 1179 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1180 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1181 | root_dentry = d_make_root(root); |
1182 | if (!root_dentry) | |
cc080e9e | 1183 | goto err_dev_free; |
0ce267ff | 1184 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1185 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1186 | |
4250c066 | 1187 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1188 | if (!init_req) |
1189 | goto err_put_root; | |
825d6d33 | 1190 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1191 | |
0ec7ca41 | 1192 | if (is_bdev) { |
4250c066 | 1193 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1194 | if (!fc->destroy_req) |
17e18ab6 | 1195 | goto err_free_init_req; |
0ec7ca41 MS |
1196 | } |
1197 | ||
bafa9654 | 1198 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1199 | err = -EINVAL; |
1200 | if (file->private_data) | |
bafa9654 | 1201 | goto err_unlock; |
8aa09a50 | 1202 | |
bafa9654 MS |
1203 | err = fuse_ctl_add_conn(fc); |
1204 | if (err) | |
1205 | goto err_unlock; | |
1206 | ||
1207 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1208 | sb->s_root = root_dentry; |
cc080e9e | 1209 | file->private_data = fud; |
bafa9654 | 1210 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1211 | /* |
1212 | * atomic_dec_and_test() in fput() provides the necessary | |
1213 | * memory barrier for file->private_data to be visible on all | |
1214 | * CPUs after this | |
1215 | */ | |
1216 | fput(file); | |
f543f253 | 1217 | |
ce1d5a49 | 1218 | fuse_send_init(fc, init_req); |
f543f253 | 1219 | |
d8a5ba45 MS |
1220 | return 0; |
1221 | ||
bafa9654 MS |
1222 | err_unlock: |
1223 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1224 | err_free_init_req: |
ce1d5a49 | 1225 | fuse_request_free(init_req); |
f543f253 MS |
1226 | err_put_root: |
1227 | dput(root_dentry); | |
cc080e9e MS |
1228 | err_dev_free: |
1229 | fuse_dev_free(fud); | |
c2b8f006 | 1230 | err_put_conn: |
bafa9654 | 1231 | fuse_conn_put(fc); |
543b8f86 | 1232 | sb->s_fs_info = NULL; |
c2b8f006 MS |
1233 | err_fput: |
1234 | fput(file); | |
1235 | err: | |
d8a5ba45 MS |
1236 | return err; |
1237 | } | |
1238 | ||
c30da2e9 | 1239 | static int fuse_get_tree(struct fs_context *fc) |
d8a5ba45 | 1240 | { |
c30da2e9 DH |
1241 | struct fuse_fs_context *ctx = fc->fs_private; |
1242 | ||
1243 | if (!ctx->fd_present || !ctx->rootmode_present || | |
1244 | !ctx->user_id_present || !ctx->group_id_present) | |
1245 | return -EINVAL; | |
1246 | ||
1247 | #ifdef CONFIG_BLOCK | |
1248 | if (ctx->is_bdev) | |
1249 | return get_tree_bdev(fc, fuse_fill_super); | |
1250 | #endif | |
1251 | ||
1252 | return get_tree_nodev(fc, fuse_fill_super); | |
1253 | } | |
1254 | ||
1255 | static const struct fs_context_operations fuse_context_ops = { | |
1256 | .free = fuse_free_fc, | |
1257 | .parse_param = fuse_parse_param, | |
1258 | .get_tree = fuse_get_tree, | |
1259 | }; | |
1260 | ||
1261 | /* | |
1262 | * Set up the filesystem mount context. | |
1263 | */ | |
1264 | static int fuse_init_fs_context(struct fs_context *fc) | |
1265 | { | |
1266 | struct fuse_fs_context *ctx; | |
1267 | ||
1268 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1269 | if (!ctx) | |
1270 | return -ENOMEM; | |
1271 | ||
1272 | ctx->max_read = ~0; | |
1273 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
1274 | ||
1275 | #ifdef CONFIG_BLOCK | |
1276 | if (fc->fs_type == &fuseblk_fs_type) | |
1277 | ctx->is_bdev = true; | |
1278 | #endif | |
1279 | ||
1280 | fc->fs_private = ctx; | |
1281 | fc->ops = &fuse_context_ops; | |
1282 | return 0; | |
d8a5ba45 MS |
1283 | } |
1284 | ||
e8f3bd77 | 1285 | static void fuse_sb_destroy(struct super_block *sb) |
3b463ae0 JM |
1286 | { |
1287 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1288 | ||
1289 | if (fc) { | |
e8f3bd77 MS |
1290 | fuse_send_destroy(fc); |
1291 | ||
eb98e3bd | 1292 | fuse_abort_conn(fc); |
e8f3bd77 MS |
1293 | fuse_wait_aborted(fc); |
1294 | ||
3b463ae0 JM |
1295 | down_write(&fc->killsb); |
1296 | fc->sb = NULL; | |
1297 | up_write(&fc->killsb); | |
1298 | } | |
e8f3bd77 | 1299 | } |
3b463ae0 | 1300 | |
e8f3bd77 MS |
1301 | static void fuse_kill_sb_anon(struct super_block *sb) |
1302 | { | |
1303 | fuse_sb_destroy(sb); | |
3b463ae0 JM |
1304 | kill_anon_super(sb); |
1305 | } | |
1306 | ||
875d95ec MS |
1307 | static struct file_system_type fuse_fs_type = { |
1308 | .owner = THIS_MODULE, | |
1309 | .name = "fuse", | |
4ad769f3 | 1310 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 DH |
1311 | .init_fs_context = fuse_init_fs_context, |
1312 | .parameters = &fuse_fs_parameters, | |
3b463ae0 | 1313 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1314 | }; |
7f78e035 | 1315 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1316 | |
1317 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1318 | static void fuse_kill_sb_blk(struct super_block *sb) |
1319 | { | |
e8f3bd77 | 1320 | fuse_sb_destroy(sb); |
3b463ae0 JM |
1321 | kill_block_super(sb); |
1322 | } | |
1323 | ||
d6392f87 MS |
1324 | static struct file_system_type fuseblk_fs_type = { |
1325 | .owner = THIS_MODULE, | |
1326 | .name = "fuseblk", | |
c30da2e9 DH |
1327 | .init_fs_context = fuse_init_fs_context, |
1328 | .parameters = &fuse_fs_parameters, | |
3b463ae0 | 1329 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1330 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1331 | }; |
7f78e035 | 1332 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1333 | |
875d95ec MS |
1334 | static inline int register_fuseblk(void) |
1335 | { | |
1336 | return register_filesystem(&fuseblk_fs_type); | |
1337 | } | |
1338 | ||
1339 | static inline void unregister_fuseblk(void) | |
1340 | { | |
1341 | unregister_filesystem(&fuseblk_fs_type); | |
1342 | } | |
1343 | #else | |
1344 | static inline int register_fuseblk(void) | |
1345 | { | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | static inline void unregister_fuseblk(void) | |
1350 | { | |
1351 | } | |
1352 | #endif | |
1353 | ||
51cc5068 | 1354 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1355 | { |
1729a16c | 1356 | struct inode *inode = foo; |
d8a5ba45 | 1357 | |
a35afb83 | 1358 | inode_init_once(inode); |
d8a5ba45 MS |
1359 | } |
1360 | ||
1361 | static int __init fuse_fs_init(void) | |
1362 | { | |
1363 | int err; | |
1364 | ||
d6392f87 | 1365 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1366 | sizeof(struct fuse_inode), 0, |
1367 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1368 | fuse_inode_init_once); | |
d6392f87 MS |
1369 | err = -ENOMEM; |
1370 | if (!fuse_inode_cachep) | |
988f0325 AV |
1371 | goto out; |
1372 | ||
1373 | err = register_fuseblk(); | |
1374 | if (err) | |
1375 | goto out2; | |
1376 | ||
1377 | err = register_filesystem(&fuse_fs_type); | |
1378 | if (err) | |
1379 | goto out3; | |
d6392f87 MS |
1380 | |
1381 | return 0; | |
d8a5ba45 | 1382 | |
988f0325 | 1383 | out3: |
875d95ec | 1384 | unregister_fuseblk(); |
988f0325 AV |
1385 | out2: |
1386 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1387 | out: |
d8a5ba45 MS |
1388 | return err; |
1389 | } | |
1390 | ||
1391 | static void fuse_fs_cleanup(void) | |
1392 | { | |
1393 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1394 | unregister_fuseblk(); |
8c0a8537 KS |
1395 | |
1396 | /* | |
1397 | * Make sure all delayed rcu free inodes are flushed before we | |
1398 | * destroy cache. | |
1399 | */ | |
1400 | rcu_barrier(); | |
d8a5ba45 MS |
1401 | kmem_cache_destroy(fuse_inode_cachep); |
1402 | } | |
1403 | ||
5c89e17e | 1404 | static struct kobject *fuse_kobj; |
5c89e17e | 1405 | |
f543f253 MS |
1406 | static int fuse_sysfs_init(void) |
1407 | { | |
1408 | int err; | |
1409 | ||
00d26666 | 1410 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1411 | if (!fuse_kobj) { |
1412 | err = -ENOMEM; | |
f543f253 | 1413 | goto out_err; |
5c89e17e | 1414 | } |
f543f253 | 1415 | |
f9bb4882 EB |
1416 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1417 | if (err) | |
f543f253 MS |
1418 | goto out_fuse_unregister; |
1419 | ||
1420 | return 0; | |
1421 | ||
1422 | out_fuse_unregister: | |
197b12d6 | 1423 | kobject_put(fuse_kobj); |
f543f253 MS |
1424 | out_err: |
1425 | return err; | |
1426 | } | |
1427 | ||
1428 | static void fuse_sysfs_cleanup(void) | |
1429 | { | |
f9bb4882 | 1430 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1431 | kobject_put(fuse_kobj); |
f543f253 MS |
1432 | } |
1433 | ||
d8a5ba45 MS |
1434 | static int __init fuse_init(void) |
1435 | { | |
1436 | int res; | |
1437 | ||
f2294482 KS |
1438 | pr_info("init (API version %i.%i)\n", |
1439 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1440 | |
bafa9654 | 1441 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1442 | res = fuse_fs_init(); |
1443 | if (res) | |
1444 | goto err; | |
1445 | ||
334f485d MS |
1446 | res = fuse_dev_init(); |
1447 | if (res) | |
1448 | goto err_fs_cleanup; | |
1449 | ||
f543f253 MS |
1450 | res = fuse_sysfs_init(); |
1451 | if (res) | |
1452 | goto err_dev_cleanup; | |
1453 | ||
bafa9654 MS |
1454 | res = fuse_ctl_init(); |
1455 | if (res) | |
1456 | goto err_sysfs_cleanup; | |
1457 | ||
487ea5af CH |
1458 | sanitize_global_limit(&max_user_bgreq); |
1459 | sanitize_global_limit(&max_user_congthresh); | |
1460 | ||
d8a5ba45 MS |
1461 | return 0; |
1462 | ||
bafa9654 MS |
1463 | err_sysfs_cleanup: |
1464 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1465 | err_dev_cleanup: |
1466 | fuse_dev_cleanup(); | |
334f485d MS |
1467 | err_fs_cleanup: |
1468 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1469 | err: |
1470 | return res; | |
1471 | } | |
1472 | ||
1473 | static void __exit fuse_exit(void) | |
1474 | { | |
f2294482 | 1475 | pr_debug("exit\n"); |
d8a5ba45 | 1476 | |
bafa9654 | 1477 | fuse_ctl_cleanup(); |
f543f253 | 1478 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1479 | fuse_fs_cleanup(); |
334f485d | 1480 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1481 | } |
1482 | ||
1483 | module_init(fuse_init); | |
1484 | module_exit(fuse_exit); |