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Commit | Line | Data |
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d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
487ea5af | 17 | #include <linux/moduleparam.h> |
d8a5ba45 MS |
18 | #include <linux/parser.h> |
19 | #include <linux/statfs.h> | |
9c8ef561 | 20 | #include <linux/random.h> |
e8edc6e0 | 21 | #include <linux/sched.h> |
dbd561d2 | 22 | #include <linux/exportfs.h> |
60bcc88a | 23 | #include <linux/posix_acl.h> |
0b6e9ea0 | 24 | #include <linux/pid_namespace.h> |
d8a5ba45 MS |
25 | |
26 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
27 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
e18b890b | 30 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
31 | struct list_head fuse_conn_list; |
32 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 33 | |
e4dca7b7 | 34 | static int set_global_limit(const char *val, const struct kernel_param *kp); |
487ea5af | 35 | |
79a9d994 | 36 | unsigned max_user_bgreq; |
487ea5af CH |
37 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
38 | &max_user_bgreq, 0644); | |
39 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
40 | MODULE_PARM_DESC(max_user_bgreq, | |
41 | "Global limit for the maximum number of backgrounded requests an " | |
42 | "unprivileged user can set"); | |
43 | ||
79a9d994 | 44 | unsigned max_user_congthresh; |
487ea5af CH |
45 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
46 | &max_user_congthresh, 0644); | |
47 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
48 | MODULE_PARM_DESC(max_user_congthresh, | |
49 | "Global limit for the maximum congestion threshold an " | |
50 | "unprivileged user can set"); | |
51 | ||
d8a5ba45 MS |
52 | #define FUSE_SUPER_MAGIC 0x65735546 |
53 | ||
d1875dba MS |
54 | #define FUSE_DEFAULT_BLKSIZE 512 |
55 | ||
7a6d3c8b CH |
56 | /** Maximum number of outstanding background requests */ |
57 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
58 | ||
59 | /** Congestion starts at 75% of maximum */ | |
60 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
61 | ||
d8a5ba45 MS |
62 | struct fuse_mount_data { |
63 | int fd; | |
64 | unsigned rootmode; | |
499dcf20 EB |
65 | kuid_t user_id; |
66 | kgid_t group_id; | |
1729a16c MS |
67 | unsigned fd_present:1; |
68 | unsigned rootmode_present:1; | |
69 | unsigned user_id_present:1; | |
70 | unsigned group_id_present:1; | |
29433a29 MS |
71 | unsigned default_permissions:1; |
72 | unsigned allow_other:1; | |
db50b96c | 73 | unsigned max_read; |
d8091614 | 74 | unsigned blksize; |
d8a5ba45 MS |
75 | }; |
76 | ||
a2daff68 | 77 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
78 | { |
79 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
80 | } | |
81 | ||
d8a5ba45 MS |
82 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
83 | { | |
84 | struct inode *inode; | |
85 | struct fuse_inode *fi; | |
86 | ||
e94b1766 | 87 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
88 | if (!inode) |
89 | return NULL; | |
90 | ||
91 | fi = get_fuse_inode(inode); | |
0a0898cf | 92 | fi->i_time = 0; |
2f1e8196 | 93 | fi->inval_mask = 0; |
d8a5ba45 | 94 | fi->nodeid = 0; |
9e6268db | 95 | fi->nlookup = 0; |
fbee36b9 | 96 | fi->attr_version = 0; |
45c72cd7 | 97 | fi->orig_ino = 0; |
4582a4ab | 98 | fi->state = 0; |
5c672ab3 | 99 | mutex_init(&fi->mutex); |
07e77dca MS |
100 | fi->forget = fuse_alloc_forget(); |
101 | if (!fi->forget) { | |
e5e5558e MS |
102 | kmem_cache_free(fuse_inode_cachep, inode); |
103 | return NULL; | |
104 | } | |
d8a5ba45 MS |
105 | |
106 | return inode; | |
107 | } | |
108 | ||
fa0d7e3d NP |
109 | static void fuse_i_callback(struct rcu_head *head) |
110 | { | |
111 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
112 | kmem_cache_free(fuse_inode_cachep, inode); |
113 | } | |
114 | ||
d8a5ba45 MS |
115 | static void fuse_destroy_inode(struct inode *inode) |
116 | { | |
e5e5558e | 117 | struct fuse_inode *fi = get_fuse_inode(inode); |
4fc4bb79 | 118 | if (S_ISREG(inode->i_mode) && !is_bad_inode(inode)) { |
ab2257e9 MS |
119 | WARN_ON(!list_empty(&fi->write_files)); |
120 | WARN_ON(!list_empty(&fi->queued_writes)); | |
121 | } | |
5c672ab3 | 122 | mutex_destroy(&fi->mutex); |
07e77dca | 123 | kfree(fi->forget); |
fa0d7e3d | 124 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
125 | } |
126 | ||
b57922d9 | 127 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 128 | { |
91b0abe3 | 129 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 130 | clear_inode(inode); |
1751e8a6 | 131 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 132 | struct fuse_conn *fc = get_fuse_conn(inode); |
e5e5558e | 133 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
134 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
135 | fi->forget = NULL; | |
e5e5558e | 136 | } |
d8a5ba45 MS |
137 | } |
138 | ||
71421259 MS |
139 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
140 | { | |
02b9984d | 141 | sync_filesystem(sb); |
1751e8a6 | 142 | if (*flags & SB_MANDLOCK) |
71421259 MS |
143 | return -EINVAL; |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
45c72cd7 PS |
148 | /* |
149 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
150 | * so that it will fit. | |
151 | */ | |
152 | static ino_t fuse_squash_ino(u64 ino64) | |
153 | { | |
154 | ino_t ino = (ino_t) ino64; | |
155 | if (sizeof(ino_t) < sizeof(u64)) | |
156 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
157 | return ino; | |
158 | } | |
159 | ||
3be5a52b MS |
160 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
161 | u64 attr_valid) | |
d8a5ba45 | 162 | { |
9ffbb916 | 163 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 164 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 165 | |
1fb69e78 MS |
166 | fi->attr_version = ++fc->attr_version; |
167 | fi->i_time = attr_valid; | |
2f1e8196 | 168 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 169 | |
45c72cd7 | 170 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 171 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 172 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
173 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
174 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 MS |
175 | inode->i_blocks = attr->blocks; |
176 | inode->i_atime.tv_sec = attr->atime; | |
177 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
178 | /* mtime from server may be stale due to local buffered write */ |
179 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
180 | inode->i_mtime.tv_sec = attr->mtime; | |
181 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
182 | inode->i_ctime.tv_sec = attr->ctime; |
183 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 184 | } |
e00d2c2d | 185 | |
0e9663ee MS |
186 | if (attr->blksize != 0) |
187 | inode->i_blkbits = ilog2(attr->blksize); | |
188 | else | |
189 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
190 | ||
ebc14c4d MS |
191 | /* |
192 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
193 | * to check permissions. This prevents failures due to the | |
194 | * check in may_delete(). | |
195 | */ | |
196 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 197 | if (!fc->default_permissions) |
ebc14c4d | 198 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
199 | |
200 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
201 | } |
202 | ||
203 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
204 | u64 attr_valid, u64 attr_version) | |
205 | { | |
206 | struct fuse_conn *fc = get_fuse_conn(inode); | |
207 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 208 | bool is_wb = fc->writeback_cache; |
3be5a52b | 209 | loff_t oldsize; |
a64ba10f | 210 | struct timespec64 old_mtime; |
3be5a52b MS |
211 | |
212 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
213 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
214 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
215 | spin_unlock(&fc->lock); |
216 | return; | |
217 | } | |
218 | ||
a64ba10f | 219 | old_mtime = inode->i_mtime; |
3be5a52b | 220 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 221 | |
e00d2c2d | 222 | oldsize = inode->i_size; |
8373200b PE |
223 | /* |
224 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
225 | * extend local i_size without keeping userspace server in sync. So, | |
226 | * attr->size coming from server can be stale. We cannot trust it. | |
227 | */ | |
228 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
229 | i_size_write(inode, attr->size); | |
e00d2c2d MS |
230 | spin_unlock(&fc->lock); |
231 | ||
8373200b | 232 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
233 | bool inval = false; |
234 | ||
235 | if (oldsize != attr->size) { | |
7caef267 | 236 | truncate_pagecache(inode, attr->size); |
eed2179e BF |
237 | inval = true; |
238 | } else if (fc->auto_inval_data) { | |
a64ba10f | 239 | struct timespec64 new_mtime = { |
eed2179e BF |
240 | .tv_sec = attr->mtime, |
241 | .tv_nsec = attr->mtimensec, | |
242 | }; | |
243 | ||
244 | /* | |
245 | * Auto inval mode also checks and invalidates if mtime | |
246 | * has changed. | |
247 | */ | |
a64ba10f | 248 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
249 | inval = true; |
250 | } | |
251 | ||
252 | if (inval) | |
253 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 254 | } |
d8a5ba45 MS |
255 | } |
256 | ||
257 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
258 | { | |
259 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 260 | inode->i_size = attr->size; |
b0aa7606 MP |
261 | inode->i_mtime.tv_sec = attr->mtime; |
262 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
263 | inode->i_ctime.tv_sec = attr->ctime; |
264 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
265 | if (S_ISREG(inode->i_mode)) { |
266 | fuse_init_common(inode); | |
b6aeaded | 267 | fuse_init_file_inode(inode); |
e5e5558e MS |
268 | } else if (S_ISDIR(inode->i_mode)) |
269 | fuse_init_dir(inode); | |
270 | else if (S_ISLNK(inode->i_mode)) | |
271 | fuse_init_symlink(inode); | |
272 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
273 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
274 | fuse_init_common(inode); | |
275 | init_special_inode(inode, inode->i_mode, | |
276 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
277 | } else |
278 | BUG(); | |
d8a5ba45 MS |
279 | } |
280 | ||
3b463ae0 | 281 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 282 | { |
b48badf0 | 283 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
284 | if (get_node_id(inode) == nodeid) |
285 | return 1; | |
286 | else | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
291 | { | |
b48badf0 | 292 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
293 | get_fuse_inode(inode)->nodeid = nodeid; |
294 | return 0; | |
295 | } | |
296 | ||
b48badf0 | 297 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
298 | int generation, struct fuse_attr *attr, |
299 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
300 | { |
301 | struct inode *inode; | |
9e6268db | 302 | struct fuse_inode *fi; |
d8a5ba45 | 303 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
304 | |
305 | retry: | |
306 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
307 | if (!inode) | |
308 | return NULL; | |
309 | ||
310 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 311 | inode->i_flags |= S_NOATIME; |
d31433c8 | 312 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 313 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 314 | inode->i_generation = generation; |
d8a5ba45 MS |
315 | fuse_init_inode(inode, attr); |
316 | unlock_new_inode(inode); | |
317 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
318 | /* Inode has changed type, any I/O on the old should fail */ |
319 | make_bad_inode(inode); | |
320 | iput(inode); | |
d8a5ba45 MS |
321 | goto retry; |
322 | } | |
323 | ||
9e6268db | 324 | fi = get_fuse_inode(inode); |
8da5ff23 | 325 | spin_lock(&fc->lock); |
1729a16c | 326 | fi->nlookup++; |
8da5ff23 | 327 | spin_unlock(&fc->lock); |
1fb69e78 MS |
328 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
329 | ||
d8a5ba45 MS |
330 | return inode; |
331 | } | |
332 | ||
3b463ae0 JM |
333 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
334 | loff_t offset, loff_t len) | |
335 | { | |
336 | struct inode *inode; | |
337 | pgoff_t pg_start; | |
338 | pgoff_t pg_end; | |
339 | ||
340 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
341 | if (!inode) | |
342 | return -ENOENT; | |
343 | ||
344 | fuse_invalidate_attr(inode); | |
60bcc88a | 345 | forget_all_cached_acls(inode); |
3b463ae0 | 346 | if (offset >= 0) { |
09cbfeaf | 347 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
348 | if (len <= 0) |
349 | pg_end = -1; | |
350 | else | |
09cbfeaf | 351 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
352 | invalidate_inode_pages2_range(inode->i_mapping, |
353 | pg_start, pg_end); | |
354 | } | |
355 | iput(inode); | |
356 | return 0; | |
357 | } | |
358 | ||
63576c13 | 359 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 360 | { |
63576c13 MS |
361 | bool locked = false; |
362 | ||
363 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 364 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
365 | locked = true; |
366 | } | |
367 | ||
368 | return locked; | |
5c672ab3 MS |
369 | } |
370 | ||
63576c13 | 371 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 372 | { |
63576c13 | 373 | if (locked) |
5c672ab3 MS |
374 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
375 | } | |
376 | ||
42faad99 | 377 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 378 | { |
3b7008b2 | 379 | fuse_abort_conn(get_fuse_conn_super(sb), false); |
69a53bf2 MS |
380 | } |
381 | ||
0ec7ca41 MS |
382 | static void fuse_send_destroy(struct fuse_conn *fc) |
383 | { | |
384 | struct fuse_req *req = fc->destroy_req; | |
385 | if (req && fc->conn_init) { | |
386 | fc->destroy_req = NULL; | |
387 | req->in.h.opcode = FUSE_DESTROY; | |
825d6d33 MS |
388 | __set_bit(FR_FORCE, &req->flags); |
389 | __clear_bit(FR_BACKGROUND, &req->flags); | |
b93f858a | 390 | fuse_request_send(fc, req); |
0ec7ca41 MS |
391 | fuse_put_request(fc, req); |
392 | } | |
393 | } | |
394 | ||
a325f9b9 TH |
395 | static void fuse_put_super(struct super_block *sb) |
396 | { | |
397 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
398 | ||
bbd99797 MS |
399 | mutex_lock(&fuse_mutex); |
400 | list_del(&fc->entry); | |
401 | fuse_ctl_remove_conn(fc); | |
402 | mutex_unlock(&fuse_mutex); | |
bbd99797 | 403 | |
bafa9654 | 404 | fuse_conn_put(fc); |
d8a5ba45 MS |
405 | } |
406 | ||
e5e5558e MS |
407 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
408 | { | |
409 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
410 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 411 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
412 | stbuf->f_blocks = attr->blocks; |
413 | stbuf->f_bfree = attr->bfree; | |
414 | stbuf->f_bavail = attr->bavail; | |
415 | stbuf->f_files = attr->files; | |
416 | stbuf->f_ffree = attr->ffree; | |
417 | stbuf->f_namelen = attr->namelen; | |
418 | /* fsid is left zero */ | |
419 | } | |
420 | ||
726c3342 | 421 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 422 | { |
726c3342 | 423 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 424 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 425 | FUSE_ARGS(args); |
e5e5558e MS |
426 | struct fuse_statfs_out outarg; |
427 | int err; | |
428 | ||
c2132c1b | 429 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
430 | buf->f_type = FUSE_SUPER_MAGIC; |
431 | return 0; | |
432 | } | |
433 | ||
de5f1202 | 434 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
435 | args.in.numargs = 0; |
436 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 437 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 438 | args.out.numargs = 1; |
21f62174 | 439 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
440 | args.out.args[0].value = &outarg; |
441 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
442 | if (!err) |
443 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
444 | return err; |
445 | } | |
446 | ||
d8a5ba45 MS |
447 | enum { |
448 | OPT_FD, | |
449 | OPT_ROOTMODE, | |
450 | OPT_USER_ID, | |
87729a55 | 451 | OPT_GROUP_ID, |
d8a5ba45 MS |
452 | OPT_DEFAULT_PERMISSIONS, |
453 | OPT_ALLOW_OTHER, | |
db50b96c | 454 | OPT_MAX_READ, |
d8091614 | 455 | OPT_BLKSIZE, |
d8a5ba45 MS |
456 | OPT_ERR |
457 | }; | |
458 | ||
a447c093 | 459 | static const match_table_t tokens = { |
d8a5ba45 MS |
460 | {OPT_FD, "fd=%u"}, |
461 | {OPT_ROOTMODE, "rootmode=%o"}, | |
462 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 463 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
464 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
465 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 466 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 467 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
468 | {OPT_ERR, NULL} |
469 | }; | |
470 | ||
233a01fa MS |
471 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
472 | { | |
473 | int err = -ENOMEM; | |
474 | char *buf = match_strdup(s); | |
475 | if (buf) { | |
476 | err = kstrtouint(buf, 10, res); | |
477 | kfree(buf); | |
478 | } | |
479 | return err; | |
480 | } | |
481 | ||
8cb08329 EB |
482 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev, |
483 | struct user_namespace *user_ns) | |
d8a5ba45 MS |
484 | { |
485 | char *p; | |
486 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 487 | d->max_read = ~0; |
d1875dba | 488 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
489 | |
490 | while ((p = strsep(&opt, ",")) != NULL) { | |
491 | int token; | |
492 | int value; | |
233a01fa | 493 | unsigned uv; |
d8a5ba45 MS |
494 | substring_t args[MAX_OPT_ARGS]; |
495 | if (!*p) | |
496 | continue; | |
497 | ||
498 | token = match_token(p, tokens, args); | |
499 | switch (token) { | |
500 | case OPT_FD: | |
501 | if (match_int(&args[0], &value)) | |
502 | return 0; | |
503 | d->fd = value; | |
5a533682 | 504 | d->fd_present = 1; |
d8a5ba45 MS |
505 | break; |
506 | ||
507 | case OPT_ROOTMODE: | |
508 | if (match_octal(&args[0], &value)) | |
509 | return 0; | |
a5bfffac TS |
510 | if (!fuse_valid_type(value)) |
511 | return 0; | |
d8a5ba45 | 512 | d->rootmode = value; |
5a533682 | 513 | d->rootmode_present = 1; |
d8a5ba45 MS |
514 | break; |
515 | ||
516 | case OPT_USER_ID: | |
233a01fa | 517 | if (fuse_match_uint(&args[0], &uv)) |
d8a5ba45 | 518 | return 0; |
8cb08329 | 519 | d->user_id = make_kuid(user_ns, uv); |
499dcf20 EB |
520 | if (!uid_valid(d->user_id)) |
521 | return 0; | |
5a533682 | 522 | d->user_id_present = 1; |
d8a5ba45 MS |
523 | break; |
524 | ||
87729a55 | 525 | case OPT_GROUP_ID: |
233a01fa | 526 | if (fuse_match_uint(&args[0], &uv)) |
87729a55 | 527 | return 0; |
8cb08329 | 528 | d->group_id = make_kgid(user_ns, uv); |
499dcf20 EB |
529 | if (!gid_valid(d->group_id)) |
530 | return 0; | |
5a533682 | 531 | d->group_id_present = 1; |
87729a55 MS |
532 | break; |
533 | ||
1e9a4ed9 | 534 | case OPT_DEFAULT_PERMISSIONS: |
29433a29 | 535 | d->default_permissions = 1; |
1e9a4ed9 MS |
536 | break; |
537 | ||
538 | case OPT_ALLOW_OTHER: | |
29433a29 | 539 | d->allow_other = 1; |
1e9a4ed9 MS |
540 | break; |
541 | ||
db50b96c MS |
542 | case OPT_MAX_READ: |
543 | if (match_int(&args[0], &value)) | |
544 | return 0; | |
545 | d->max_read = value; | |
546 | break; | |
547 | ||
d8091614 MS |
548 | case OPT_BLKSIZE: |
549 | if (!is_bdev || match_int(&args[0], &value)) | |
550 | return 0; | |
551 | d->blksize = value; | |
552 | break; | |
553 | ||
d8a5ba45 MS |
554 | default: |
555 | return 0; | |
556 | } | |
557 | } | |
5a533682 MS |
558 | |
559 | if (!d->fd_present || !d->rootmode_present || | |
560 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
561 | return 0; |
562 | ||
563 | return 1; | |
564 | } | |
565 | ||
34c80b1d | 566 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 567 | { |
34c80b1d AV |
568 | struct super_block *sb = root->d_sb; |
569 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 570 | |
8cb08329 EB |
571 | seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id)); |
572 | seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id)); | |
29433a29 | 573 | if (fc->default_permissions) |
1e9a4ed9 | 574 | seq_puts(m, ",default_permissions"); |
29433a29 | 575 | if (fc->allow_other) |
1e9a4ed9 | 576 | seq_puts(m, ",allow_other"); |
db50b96c MS |
577 | if (fc->max_read != ~0) |
578 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
579 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
580 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
581 | return 0; |
582 | } | |
583 | ||
f88996a9 MS |
584 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
585 | { | |
586 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
587 | init_waitqueue_head(&fiq->waitq); | |
588 | INIT_LIST_HEAD(&fiq->pending); | |
589 | INIT_LIST_HEAD(&fiq->interrupts); | |
590 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 591 | fiq->connected = 1; |
f88996a9 MS |
592 | } |
593 | ||
3a2b5b9c MS |
594 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
595 | { | |
be2ff42c KT |
596 | unsigned int i; |
597 | ||
45a91cb1 | 598 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
599 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
600 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 601 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 602 | fpq->connected = 1; |
3a2b5b9c MS |
603 | } |
604 | ||
8cb08329 | 605 | void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns) |
d8a5ba45 | 606 | { |
0d179aa5 TH |
607 | memset(fc, 0, sizeof(*fc)); |
608 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 609 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 610 | init_rwsem(&fc->killsb); |
095fc40a | 611 | refcount_set(&fc->count, 1); |
c3696046 | 612 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
613 | init_waitqueue_head(&fc->blocked_waitq); |
614 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 615 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
616 | INIT_LIST_HEAD(&fc->bg_queue); |
617 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 618 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 619 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
620 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
621 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
622 | fc->khctr = 0; |
623 | fc->polled_files = RB_ROOT; | |
0aada884 | 624 | fc->blocked = 0; |
796523fb | 625 | fc->initialized = 0; |
e16714d8 | 626 | fc->connected = 1; |
0d179aa5 TH |
627 | fc->attr_version = 1; |
628 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
0b6e9ea0 | 629 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 630 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 631 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
d8a5ba45 | 632 | } |
0d179aa5 | 633 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 634 | |
bafa9654 MS |
635 | void fuse_conn_put(struct fuse_conn *fc) |
636 | { | |
095fc40a | 637 | if (refcount_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
638 | if (fc->destroy_req) |
639 | fuse_request_free(fc->destroy_req); | |
0b6e9ea0 | 640 | put_pid_ns(fc->pid_ns); |
8cb08329 | 641 | put_user_ns(fc->user_ns); |
43901aab | 642 | fc->release(fc); |
d2a85164 | 643 | } |
bafa9654 | 644 | } |
08cbf542 | 645 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
646 | |
647 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
648 | { | |
095fc40a | 649 | refcount_inc(&fc->count); |
bafa9654 MS |
650 | return fc; |
651 | } | |
08cbf542 | 652 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 653 | |
b93f858a | 654 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
655 | { |
656 | struct fuse_attr attr; | |
657 | memset(&attr, 0, sizeof(attr)); | |
658 | ||
659 | attr.mode = mode; | |
660 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 661 | attr.nlink = 1; |
1fb69e78 | 662 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
663 | } |
664 | ||
1729a16c | 665 | struct fuse_inode_handle { |
dbd561d2 MS |
666 | u64 nodeid; |
667 | u32 generation; | |
668 | }; | |
669 | ||
670 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
671 | struct fuse_inode_handle *handle) | |
672 | { | |
33670fa2 | 673 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
674 | struct inode *inode; |
675 | struct dentry *entry; | |
676 | int err = -ESTALE; | |
677 | ||
678 | if (handle->nodeid == 0) | |
679 | goto out_err; | |
680 | ||
681 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
682 | if (!inode) { |
683 | struct fuse_entry_out outarg; | |
13983d06 | 684 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
685 | |
686 | if (!fc->export_support) | |
687 | goto out_err; | |
688 | ||
33670fa2 MS |
689 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
690 | &inode); | |
691 | if (err && err != -ENOENT) | |
692 | goto out_err; | |
693 | if (err || !inode) { | |
694 | err = -ESTALE; | |
695 | goto out_err; | |
696 | } | |
697 | err = -EIO; | |
698 | if (get_node_id(inode) != handle->nodeid) | |
699 | goto out_iput; | |
700 | } | |
dbd561d2 MS |
701 | err = -ESTALE; |
702 | if (inode->i_generation != handle->generation) | |
703 | goto out_iput; | |
704 | ||
44003728 | 705 | entry = d_obtain_alias(inode); |
c35eebe9 | 706 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 707 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
708 | |
709 | return entry; | |
710 | ||
711 | out_iput: | |
712 | iput(inode); | |
713 | out_err: | |
714 | return ERR_PTR(err); | |
715 | } | |
716 | ||
b0b0382b AV |
717 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
718 | struct inode *parent) | |
dbd561d2 | 719 | { |
b0b0382b | 720 | int len = parent ? 6 : 3; |
dbd561d2 MS |
721 | u64 nodeid; |
722 | u32 generation; | |
723 | ||
5fe0c237 AK |
724 | if (*max_len < len) { |
725 | *max_len = len; | |
94e07a75 | 726 | return FILEID_INVALID; |
5fe0c237 | 727 | } |
dbd561d2 MS |
728 | |
729 | nodeid = get_fuse_inode(inode)->nodeid; | |
730 | generation = inode->i_generation; | |
731 | ||
732 | fh[0] = (u32)(nodeid >> 32); | |
733 | fh[1] = (u32)(nodeid & 0xffffffff); | |
734 | fh[2] = generation; | |
735 | ||
b0b0382b | 736 | if (parent) { |
dbd561d2 MS |
737 | nodeid = get_fuse_inode(parent)->nodeid; |
738 | generation = parent->i_generation; | |
dbd561d2 MS |
739 | |
740 | fh[3] = (u32)(nodeid >> 32); | |
741 | fh[4] = (u32)(nodeid & 0xffffffff); | |
742 | fh[5] = generation; | |
743 | } | |
744 | ||
745 | *max_len = len; | |
b0b0382b | 746 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
747 | } |
748 | ||
749 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
750 | struct fid *fid, int fh_len, int fh_type) | |
751 | { | |
752 | struct fuse_inode_handle handle; | |
753 | ||
754 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
755 | return NULL; | |
756 | ||
757 | handle.nodeid = (u64) fid->raw[0] << 32; | |
758 | handle.nodeid |= (u64) fid->raw[1]; | |
759 | handle.generation = fid->raw[2]; | |
760 | return fuse_get_dentry(sb, &handle); | |
761 | } | |
762 | ||
763 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
764 | struct fid *fid, int fh_len, int fh_type) | |
765 | { | |
766 | struct fuse_inode_handle parent; | |
767 | ||
768 | if (fh_type != 0x82 || fh_len < 6) | |
769 | return NULL; | |
770 | ||
771 | parent.nodeid = (u64) fid->raw[3] << 32; | |
772 | parent.nodeid |= (u64) fid->raw[4]; | |
773 | parent.generation = fid->raw[5]; | |
774 | return fuse_get_dentry(sb, &parent); | |
775 | } | |
776 | ||
33670fa2 MS |
777 | static struct dentry *fuse_get_parent(struct dentry *child) |
778 | { | |
2b0143b5 | 779 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
780 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
781 | struct inode *inode; | |
782 | struct dentry *parent; | |
783 | struct fuse_entry_out outarg; | |
13983d06 | 784 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
785 | int err; |
786 | ||
787 | if (!fc->export_support) | |
788 | return ERR_PTR(-ESTALE); | |
789 | ||
33670fa2 MS |
790 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
791 | &name, &outarg, &inode); | |
44003728 CH |
792 | if (err) { |
793 | if (err == -ENOENT) | |
794 | return ERR_PTR(-ESTALE); | |
33670fa2 | 795 | return ERR_PTR(err); |
33670fa2 | 796 | } |
44003728 CH |
797 | |
798 | parent = d_obtain_alias(inode); | |
c35eebe9 | 799 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 800 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
801 | |
802 | return parent; | |
803 | } | |
dbd561d2 MS |
804 | |
805 | static const struct export_operations fuse_export_operations = { | |
806 | .fh_to_dentry = fuse_fh_to_dentry, | |
807 | .fh_to_parent = fuse_fh_to_parent, | |
808 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 809 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
810 | }; |
811 | ||
ee9b6d61 | 812 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
813 | .alloc_inode = fuse_alloc_inode, |
814 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 815 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 816 | .write_inode = fuse_write_inode, |
ead5f0b5 | 817 | .drop_inode = generic_delete_inode, |
71421259 | 818 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 819 | .put_super = fuse_put_super, |
69a53bf2 | 820 | .umount_begin = fuse_umount_begin, |
e5e5558e | 821 | .statfs = fuse_statfs, |
d8a5ba45 MS |
822 | .show_options = fuse_show_options, |
823 | }; | |
824 | ||
487ea5af CH |
825 | static void sanitize_global_limit(unsigned *limit) |
826 | { | |
827 | if (*limit == 0) | |
ca79b0c2 | 828 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / |
487ea5af CH |
829 | sizeof(struct fuse_req); |
830 | ||
831 | if (*limit >= 1 << 16) | |
832 | *limit = (1 << 16) - 1; | |
833 | } | |
834 | ||
e4dca7b7 | 835 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
836 | { |
837 | int rv; | |
838 | ||
839 | rv = param_set_uint(val, kp); | |
840 | if (rv) | |
841 | return rv; | |
842 | ||
843 | sanitize_global_limit((unsigned *)kp->arg); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
849 | { | |
850 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
851 | ||
852 | if (arg->minor < 13) | |
853 | return; | |
854 | ||
855 | sanitize_global_limit(&max_user_bgreq); | |
856 | sanitize_global_limit(&max_user_congthresh); | |
857 | ||
ae2dffa3 | 858 | spin_lock(&fc->bg_lock); |
487ea5af CH |
859 | if (arg->max_background) { |
860 | fc->max_background = arg->max_background; | |
861 | ||
862 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
863 | fc->max_background = max_user_bgreq; | |
864 | } | |
865 | if (arg->congestion_threshold) { | |
866 | fc->congestion_threshold = arg->congestion_threshold; | |
867 | ||
868 | if (!cap_sys_admin && | |
869 | fc->congestion_threshold > max_user_congthresh) | |
870 | fc->congestion_threshold = max_user_congthresh; | |
871 | } | |
ae2dffa3 | 872 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
873 | } |
874 | ||
9b9a0469 MS |
875 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
876 | { | |
9b9a0469 MS |
877 | struct fuse_init_out *arg = &req->misc.init_out; |
878 | ||
879 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
880 | fc->conn_error = 1; | |
881 | else { | |
9cd68455 MS |
882 | unsigned long ra_pages; |
883 | ||
487ea5af CH |
884 | process_init_limits(fc, arg); |
885 | ||
9cd68455 | 886 | if (arg->minor >= 6) { |
09cbfeaf | 887 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
888 | if (arg->flags & FUSE_ASYNC_READ) |
889 | fc->async_read = 1; | |
71421259 MS |
890 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
891 | fc->no_lock = 1; | |
37fb3a30 MS |
892 | if (arg->minor >= 17) { |
893 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
894 | fc->no_flock = 1; | |
24114504 MS |
895 | } else { |
896 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
897 | fc->no_flock = 1; | |
37fb3a30 | 898 | } |
6ff958ed MS |
899 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
900 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
901 | if (arg->minor >= 9) { |
902 | /* LOOKUP has dependency on proto version */ | |
903 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
904 | fc->export_support = 1; | |
905 | } | |
78bb6cb9 MS |
906 | if (arg->flags & FUSE_BIG_WRITES) |
907 | fc->big_writes = 1; | |
e0a43ddc MS |
908 | if (arg->flags & FUSE_DONT_MASK) |
909 | fc->dont_mask = 1; | |
72d0d248 BF |
910 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
911 | fc->auto_inval_data = 1; | |
28420dad | 912 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 913 | fc->do_readdirplus = 1; |
28420dad MS |
914 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
915 | fc->readdirplus_auto = 1; | |
916 | } | |
60b9df7a MS |
917 | if (arg->flags & FUSE_ASYNC_DIO) |
918 | fc->async_dio = 1; | |
4d99ff8f PE |
919 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
920 | fc->writeback_cache = 1; | |
5c672ab3 MS |
921 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
922 | fc->parallel_dirops = 1; | |
5e940c1d MS |
923 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
924 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
925 | if (arg->time_gran && arg->time_gran <= 1000000000) |
926 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 927 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 928 | fc->default_permissions = 1; |
60bcc88a SF |
929 | fc->posix_acl = 1; |
930 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
931 | } | |
5571f1e6 DS |
932 | if (arg->flags & FUSE_CACHE_SYMLINKS) |
933 | fc->cache_symlinks = 1; | |
3b7008b2 SL |
934 | if (arg->flags & FUSE_ABORT_ERROR) |
935 | fc->abort_err = 1; | |
5da784cc CS |
936 | if (arg->flags & FUSE_MAX_PAGES) { |
937 | fc->max_pages = | |
938 | min_t(unsigned int, FUSE_MAX_MAX_PAGES, | |
939 | max_t(unsigned int, arg->max_pages, 1)); | |
940 | } | |
71421259 | 941 | } else { |
09cbfeaf | 942 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 943 | fc->no_lock = 1; |
37fb3a30 | 944 | fc->no_flock = 1; |
71421259 | 945 | } |
9cd68455 | 946 | |
5f7f7543 JK |
947 | fc->sb->s_bdi->ra_pages = |
948 | min(fc->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
949 | fc->minor = arg->minor; |
950 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 951 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 952 | fc->conn_init = 1; |
9b9a0469 | 953 | } |
9759bd51 | 954 | fuse_set_initialized(fc); |
08a53cdc | 955 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
956 | } |
957 | ||
ce1d5a49 | 958 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 959 | { |
9b9a0469 | 960 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 961 | |
9b9a0469 MS |
962 | arg->major = FUSE_KERNEL_VERSION; |
963 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
5f7f7543 | 964 | arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; |
78bb6cb9 | 965 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 966 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 967 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 968 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 969 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 970 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 971 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
5571f1e6 | 972 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS; |
9b9a0469 MS |
973 | req->in.h.opcode = FUSE_INIT; |
974 | req->in.numargs = 1; | |
975 | req->in.args[0].size = sizeof(*arg); | |
976 | req->in.args[0].value = arg; | |
977 | req->out.numargs = 1; | |
3ad2f3fb | 978 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
979 | with interface version < 7.5. Rest of init_out is zeroed |
980 | by do_get_request(), so a short reply is not a problem */ | |
981 | req->out.argvar = 1; | |
982 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
983 | req->out.args[0].value = &req->misc.init_out; | |
984 | req->end = process_init_reply; | |
b93f858a | 985 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
986 | } |
987 | ||
43901aab TH |
988 | static void fuse_free_conn(struct fuse_conn *fc) |
989 | { | |
cc080e9e | 990 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 991 | kfree_rcu(fc, rcu); |
43901aab TH |
992 | } |
993 | ||
a325f9b9 TH |
994 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
995 | { | |
996 | int err; | |
5f7f7543 | 997 | char *suffix = ""; |
a325f9b9 | 998 | |
69c8ebf8 | 999 | if (sb->s_bdev) { |
5f7f7543 | 1000 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1001 | /* |
1002 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1003 | * it to our private bdi... | |
1004 | */ | |
1005 | bdi_put(sb->s_bdi); | |
1006 | sb->s_bdi = &noop_backing_dev_info; | |
1007 | } | |
5f7f7543 JK |
1008 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1009 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1010 | if (err) |
1011 | return err; | |
1012 | ||
5f7f7543 JK |
1013 | sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
1014 | /* fuse does it's own writeback accounting */ | |
1015 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1016 | |
a325f9b9 TH |
1017 | /* |
1018 | * For a single fuse filesystem use max 1% of dirty + | |
1019 | * writeback threshold. | |
1020 | * | |
1021 | * This gives about 1M of write buffer for memory maps on a | |
1022 | * machine with 1G and 10% dirty_ratio, which should be more | |
1023 | * than enough. | |
1024 | * | |
1025 | * Privileged users can raise it by writing to | |
1026 | * | |
1027 | * /sys/class/bdi/<bdi>/max_ratio | |
1028 | */ | |
5f7f7543 | 1029 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1030 | |
1031 | return 0; | |
1032 | } | |
1033 | ||
cc080e9e MS |
1034 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1035 | { | |
1036 | struct fuse_dev *fud; | |
be2ff42c | 1037 | struct list_head *pq; |
cc080e9e MS |
1038 | |
1039 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1040 | if (!fud) |
1041 | return NULL; | |
cc080e9e | 1042 | |
be2ff42c KT |
1043 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1044 | if (!pq) { | |
1045 | kfree(fud); | |
1046 | return NULL; | |
cc080e9e MS |
1047 | } |
1048 | ||
be2ff42c KT |
1049 | fud->pq.processing = pq; |
1050 | fud->fc = fuse_conn_get(fc); | |
1051 | fuse_pqueue_init(&fud->pq); | |
1052 | ||
1053 | spin_lock(&fc->lock); | |
1054 | list_add_tail(&fud->entry, &fc->devices); | |
1055 | spin_unlock(&fc->lock); | |
1056 | ||
cc080e9e MS |
1057 | return fud; |
1058 | } | |
1059 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1060 | ||
1061 | void fuse_dev_free(struct fuse_dev *fud) | |
1062 | { | |
1063 | struct fuse_conn *fc = fud->fc; | |
1064 | ||
1065 | if (fc) { | |
1066 | spin_lock(&fc->lock); | |
1067 | list_del(&fud->entry); | |
1068 | spin_unlock(&fc->lock); | |
1069 | ||
1070 | fuse_conn_put(fc); | |
1071 | } | |
d72f70da | 1072 | kfree(fud->pq.processing); |
cc080e9e MS |
1073 | kfree(fud); |
1074 | } | |
1075 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1076 | ||
d8a5ba45 MS |
1077 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
1078 | { | |
cc080e9e | 1079 | struct fuse_dev *fud; |
d8a5ba45 MS |
1080 | struct fuse_conn *fc; |
1081 | struct inode *root; | |
1082 | struct fuse_mount_data d; | |
1083 | struct file *file; | |
f543f253 | 1084 | struct dentry *root_dentry; |
ce1d5a49 | 1085 | struct fuse_req *init_req; |
d8a5ba45 | 1086 | int err; |
d8091614 | 1087 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1088 | |
c2b8f006 | 1089 | err = -EINVAL; |
1751e8a6 | 1090 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1091 | goto err; |
71421259 | 1092 | |
1751e8a6 | 1093 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); |
9e1f1de0 | 1094 | |
8cb08329 | 1095 | if (!parse_fuse_opt(data, &d, is_bdev, sb->s_user_ns)) |
c2b8f006 | 1096 | goto err; |
d8a5ba45 | 1097 | |
d8091614 | 1098 | if (is_bdev) { |
875d95ec | 1099 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1100 | err = -EINVAL; |
d8091614 | 1101 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1102 | goto err; |
875d95ec | 1103 | #endif |
d8091614 | 1104 | } else { |
09cbfeaf KS |
1105 | sb->s_blocksize = PAGE_SIZE; |
1106 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1107 | } |
d8a5ba45 MS |
1108 | sb->s_magic = FUSE_SUPER_MAGIC; |
1109 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1110 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1111 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1112 | sb->s_time_gran = 1; |
dbd561d2 | 1113 | sb->s_export_op = &fuse_export_operations; |
0834136a MZ |
1114 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; |
1115 | if (sb->s_user_ns != &init_user_ns) | |
1116 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
d8a5ba45 MS |
1117 | |
1118 | file = fget(d.fd); | |
c2b8f006 | 1119 | err = -EINVAL; |
d8a5ba45 | 1120 | if (!file) |
c2b8f006 | 1121 | goto err; |
d8a5ba45 | 1122 | |
8cb08329 EB |
1123 | /* |
1124 | * Require mount to happen from the same user namespace which | |
1125 | * opened /dev/fuse to prevent potential attacks. | |
1126 | */ | |
1127 | if (file->f_op != &fuse_dev_operations || | |
1128 | file->f_cred->user_ns != sb->s_user_ns) | |
c2b8f006 | 1129 | goto err_fput; |
0720b315 | 1130 | |
e45b2546 EB |
1131 | /* |
1132 | * If we are not in the initial user namespace posix | |
1133 | * acls must be translated. | |
1134 | */ | |
1135 | if (sb->s_user_ns != &init_user_ns) | |
1136 | sb->s_xattr = fuse_no_acl_xattr_handlers; | |
1137 | ||
0d179aa5 | 1138 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1139 | err = -ENOMEM; |
1140 | if (!fc) | |
1141 | goto err_fput; | |
d8a5ba45 | 1142 | |
8cb08329 | 1143 | fuse_conn_init(fc, sb->s_user_ns); |
0ad0b325 | 1144 | fc->release = fuse_free_conn; |
a325f9b9 | 1145 | |
cc080e9e MS |
1146 | fud = fuse_dev_alloc(fc); |
1147 | if (!fud) | |
1148 | goto err_put_conn; | |
1149 | ||
a325f9b9 | 1150 | fc->dev = sb->s_dev; |
3b463ae0 | 1151 | fc->sb = sb; |
a325f9b9 TH |
1152 | err = fuse_bdi_init(fc, sb); |
1153 | if (err) | |
cc080e9e | 1154 | goto err_dev_free; |
0d179aa5 | 1155 | |
e0a43ddc | 1156 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1157 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1158 | fc->dont_mask = 1; |
1751e8a6 | 1159 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1160 | |
29433a29 MS |
1161 | fc->default_permissions = d.default_permissions; |
1162 | fc->allow_other = d.allow_other; | |
d8a5ba45 | 1163 | fc->user_id = d.user_id; |
87729a55 | 1164 | fc->group_id = d.group_id; |
f948d564 | 1165 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1166 | |
f543f253 MS |
1167 | /* Used by get_root_inode() */ |
1168 | sb->s_fs_info = fc; | |
1169 | ||
d8a5ba45 | 1170 | err = -ENOMEM; |
b93f858a | 1171 | root = fuse_get_root_inode(sb, d.rootmode); |
0ce267ff | 1172 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1173 | root_dentry = d_make_root(root); |
1174 | if (!root_dentry) | |
cc080e9e | 1175 | goto err_dev_free; |
0ce267ff | 1176 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1177 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1178 | |
4250c066 | 1179 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1180 | if (!init_req) |
1181 | goto err_put_root; | |
825d6d33 | 1182 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1183 | |
0ec7ca41 | 1184 | if (is_bdev) { |
4250c066 | 1185 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1186 | if (!fc->destroy_req) |
17e18ab6 | 1187 | goto err_free_init_req; |
0ec7ca41 MS |
1188 | } |
1189 | ||
bafa9654 | 1190 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1191 | err = -EINVAL; |
1192 | if (file->private_data) | |
bafa9654 | 1193 | goto err_unlock; |
8aa09a50 | 1194 | |
bafa9654 MS |
1195 | err = fuse_ctl_add_conn(fc); |
1196 | if (err) | |
1197 | goto err_unlock; | |
1198 | ||
1199 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1200 | sb->s_root = root_dentry; |
cc080e9e | 1201 | file->private_data = fud; |
bafa9654 | 1202 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1203 | /* |
1204 | * atomic_dec_and_test() in fput() provides the necessary | |
1205 | * memory barrier for file->private_data to be visible on all | |
1206 | * CPUs after this | |
1207 | */ | |
1208 | fput(file); | |
f543f253 | 1209 | |
ce1d5a49 | 1210 | fuse_send_init(fc, init_req); |
f543f253 | 1211 | |
d8a5ba45 MS |
1212 | return 0; |
1213 | ||
bafa9654 MS |
1214 | err_unlock: |
1215 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1216 | err_free_init_req: |
ce1d5a49 | 1217 | fuse_request_free(init_req); |
f543f253 MS |
1218 | err_put_root: |
1219 | dput(root_dentry); | |
cc080e9e MS |
1220 | err_dev_free: |
1221 | fuse_dev_free(fud); | |
c2b8f006 | 1222 | err_put_conn: |
bafa9654 | 1223 | fuse_conn_put(fc); |
543b8f86 | 1224 | sb->s_fs_info = NULL; |
c2b8f006 MS |
1225 | err_fput: |
1226 | fput(file); | |
1227 | err: | |
d8a5ba45 MS |
1228 | return err; |
1229 | } | |
1230 | ||
3c26ff6e | 1231 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1232 | int flags, const char *dev_name, |
3c26ff6e | 1233 | void *raw_data) |
d8a5ba45 | 1234 | { |
3c26ff6e | 1235 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1236 | } |
1237 | ||
e8f3bd77 | 1238 | static void fuse_sb_destroy(struct super_block *sb) |
3b463ae0 JM |
1239 | { |
1240 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1241 | ||
1242 | if (fc) { | |
e8f3bd77 MS |
1243 | fuse_send_destroy(fc); |
1244 | ||
1245 | fuse_abort_conn(fc, false); | |
1246 | fuse_wait_aborted(fc); | |
1247 | ||
3b463ae0 JM |
1248 | down_write(&fc->killsb); |
1249 | fc->sb = NULL; | |
1250 | up_write(&fc->killsb); | |
1251 | } | |
e8f3bd77 | 1252 | } |
3b463ae0 | 1253 | |
e8f3bd77 MS |
1254 | static void fuse_kill_sb_anon(struct super_block *sb) |
1255 | { | |
1256 | fuse_sb_destroy(sb); | |
3b463ae0 JM |
1257 | kill_anon_super(sb); |
1258 | } | |
1259 | ||
875d95ec MS |
1260 | static struct file_system_type fuse_fs_type = { |
1261 | .owner = THIS_MODULE, | |
1262 | .name = "fuse", | |
4ad769f3 | 1263 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
3c26ff6e | 1264 | .mount = fuse_mount, |
3b463ae0 | 1265 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1266 | }; |
7f78e035 | 1267 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1268 | |
1269 | #ifdef CONFIG_BLOCK | |
152a0836 | 1270 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1271 | int flags, const char *dev_name, |
152a0836 | 1272 | void *raw_data) |
d6392f87 | 1273 | { |
152a0836 | 1274 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1275 | } |
1276 | ||
3b463ae0 JM |
1277 | static void fuse_kill_sb_blk(struct super_block *sb) |
1278 | { | |
e8f3bd77 | 1279 | fuse_sb_destroy(sb); |
3b463ae0 JM |
1280 | kill_block_super(sb); |
1281 | } | |
1282 | ||
d6392f87 MS |
1283 | static struct file_system_type fuseblk_fs_type = { |
1284 | .owner = THIS_MODULE, | |
1285 | .name = "fuseblk", | |
152a0836 | 1286 | .mount = fuse_mount_blk, |
3b463ae0 | 1287 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1288 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1289 | }; |
7f78e035 | 1290 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1291 | |
875d95ec MS |
1292 | static inline int register_fuseblk(void) |
1293 | { | |
1294 | return register_filesystem(&fuseblk_fs_type); | |
1295 | } | |
1296 | ||
1297 | static inline void unregister_fuseblk(void) | |
1298 | { | |
1299 | unregister_filesystem(&fuseblk_fs_type); | |
1300 | } | |
1301 | #else | |
1302 | static inline int register_fuseblk(void) | |
1303 | { | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | static inline void unregister_fuseblk(void) | |
1308 | { | |
1309 | } | |
1310 | #endif | |
1311 | ||
51cc5068 | 1312 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1313 | { |
1729a16c | 1314 | struct inode *inode = foo; |
d8a5ba45 | 1315 | |
a35afb83 | 1316 | inode_init_once(inode); |
d8a5ba45 MS |
1317 | } |
1318 | ||
1319 | static int __init fuse_fs_init(void) | |
1320 | { | |
1321 | int err; | |
1322 | ||
d6392f87 | 1323 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1324 | sizeof(struct fuse_inode), 0, |
1325 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1326 | fuse_inode_init_once); | |
d6392f87 MS |
1327 | err = -ENOMEM; |
1328 | if (!fuse_inode_cachep) | |
988f0325 AV |
1329 | goto out; |
1330 | ||
1331 | err = register_fuseblk(); | |
1332 | if (err) | |
1333 | goto out2; | |
1334 | ||
1335 | err = register_filesystem(&fuse_fs_type); | |
1336 | if (err) | |
1337 | goto out3; | |
d6392f87 MS |
1338 | |
1339 | return 0; | |
d8a5ba45 | 1340 | |
988f0325 | 1341 | out3: |
875d95ec | 1342 | unregister_fuseblk(); |
988f0325 AV |
1343 | out2: |
1344 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1345 | out: |
d8a5ba45 MS |
1346 | return err; |
1347 | } | |
1348 | ||
1349 | static void fuse_fs_cleanup(void) | |
1350 | { | |
1351 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1352 | unregister_fuseblk(); |
8c0a8537 KS |
1353 | |
1354 | /* | |
1355 | * Make sure all delayed rcu free inodes are flushed before we | |
1356 | * destroy cache. | |
1357 | */ | |
1358 | rcu_barrier(); | |
d8a5ba45 MS |
1359 | kmem_cache_destroy(fuse_inode_cachep); |
1360 | } | |
1361 | ||
5c89e17e | 1362 | static struct kobject *fuse_kobj; |
5c89e17e | 1363 | |
f543f253 MS |
1364 | static int fuse_sysfs_init(void) |
1365 | { | |
1366 | int err; | |
1367 | ||
00d26666 | 1368 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1369 | if (!fuse_kobj) { |
1370 | err = -ENOMEM; | |
f543f253 | 1371 | goto out_err; |
5c89e17e | 1372 | } |
f543f253 | 1373 | |
f9bb4882 EB |
1374 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1375 | if (err) | |
f543f253 MS |
1376 | goto out_fuse_unregister; |
1377 | ||
1378 | return 0; | |
1379 | ||
1380 | out_fuse_unregister: | |
197b12d6 | 1381 | kobject_put(fuse_kobj); |
f543f253 MS |
1382 | out_err: |
1383 | return err; | |
1384 | } | |
1385 | ||
1386 | static void fuse_sysfs_cleanup(void) | |
1387 | { | |
f9bb4882 | 1388 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1389 | kobject_put(fuse_kobj); |
f543f253 MS |
1390 | } |
1391 | ||
d8a5ba45 MS |
1392 | static int __init fuse_init(void) |
1393 | { | |
1394 | int res; | |
1395 | ||
1729a16c | 1396 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1397 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1398 | ||
bafa9654 | 1399 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1400 | res = fuse_fs_init(); |
1401 | if (res) | |
1402 | goto err; | |
1403 | ||
334f485d MS |
1404 | res = fuse_dev_init(); |
1405 | if (res) | |
1406 | goto err_fs_cleanup; | |
1407 | ||
f543f253 MS |
1408 | res = fuse_sysfs_init(); |
1409 | if (res) | |
1410 | goto err_dev_cleanup; | |
1411 | ||
bafa9654 MS |
1412 | res = fuse_ctl_init(); |
1413 | if (res) | |
1414 | goto err_sysfs_cleanup; | |
1415 | ||
487ea5af CH |
1416 | sanitize_global_limit(&max_user_bgreq); |
1417 | sanitize_global_limit(&max_user_congthresh); | |
1418 | ||
d8a5ba45 MS |
1419 | return 0; |
1420 | ||
bafa9654 MS |
1421 | err_sysfs_cleanup: |
1422 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1423 | err_dev_cleanup: |
1424 | fuse_dev_cleanup(); | |
334f485d MS |
1425 | err_fs_cleanup: |
1426 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1427 | err: |
1428 | return res; | |
1429 | } | |
1430 | ||
1431 | static void __exit fuse_exit(void) | |
1432 | { | |
1433 | printk(KERN_DEBUG "fuse exit\n"); | |
1434 | ||
bafa9654 | 1435 | fuse_ctl_cleanup(); |
f543f253 | 1436 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1437 | fuse_fs_cleanup(); |
334f485d | 1438 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1439 | } |
1440 | ||
1441 | module_init(fuse_init); | |
1442 | module_exit(fuse_exit); |