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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> |
d8a5ba45 MS |
23 | |
24 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
25 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
e18b890b | 28 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
29 | struct list_head fuse_conn_list; |
30 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 31 | |
487ea5af CH |
32 | static int set_global_limit(const char *val, struct kernel_param *kp); |
33 | ||
79a9d994 | 34 | unsigned max_user_bgreq; |
487ea5af CH |
35 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
36 | &max_user_bgreq, 0644); | |
37 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
38 | MODULE_PARM_DESC(max_user_bgreq, | |
39 | "Global limit for the maximum number of backgrounded requests an " | |
40 | "unprivileged user can set"); | |
41 | ||
79a9d994 | 42 | unsigned max_user_congthresh; |
487ea5af CH |
43 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
44 | &max_user_congthresh, 0644); | |
45 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
46 | MODULE_PARM_DESC(max_user_congthresh, | |
47 | "Global limit for the maximum congestion threshold an " | |
48 | "unprivileged user can set"); | |
49 | ||
d8a5ba45 MS |
50 | #define FUSE_SUPER_MAGIC 0x65735546 |
51 | ||
d1875dba MS |
52 | #define FUSE_DEFAULT_BLKSIZE 512 |
53 | ||
7a6d3c8b CH |
54 | /** Maximum number of outstanding background requests */ |
55 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
56 | ||
57 | /** Congestion starts at 75% of maximum */ | |
58 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
59 | ||
d8a5ba45 MS |
60 | struct fuse_mount_data { |
61 | int fd; | |
62 | unsigned rootmode; | |
499dcf20 EB |
63 | kuid_t user_id; |
64 | kgid_t group_id; | |
1729a16c MS |
65 | unsigned fd_present:1; |
66 | unsigned rootmode_present:1; | |
67 | unsigned user_id_present:1; | |
68 | unsigned group_id_present:1; | |
1e9a4ed9 | 69 | unsigned flags; |
db50b96c | 70 | unsigned max_read; |
d8091614 | 71 | unsigned blksize; |
d8a5ba45 MS |
72 | }; |
73 | ||
a2daff68 | 74 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
75 | { |
76 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
77 | } | |
78 | ||
d8a5ba45 MS |
79 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
80 | { | |
81 | struct inode *inode; | |
82 | struct fuse_inode *fi; | |
83 | ||
e94b1766 | 84 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
85 | if (!inode) |
86 | return NULL; | |
87 | ||
88 | fi = get_fuse_inode(inode); | |
0a0898cf | 89 | fi->i_time = 0; |
d8a5ba45 | 90 | fi->nodeid = 0; |
9e6268db | 91 | fi->nlookup = 0; |
fbee36b9 | 92 | fi->attr_version = 0; |
3be5a52b | 93 | fi->writectr = 0; |
45c72cd7 | 94 | fi->orig_ino = 0; |
4582a4ab | 95 | fi->state = 0; |
93a8c3cd | 96 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
97 | INIT_LIST_HEAD(&fi->queued_writes); |
98 | INIT_LIST_HEAD(&fi->writepages); | |
99 | init_waitqueue_head(&fi->page_waitq); | |
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); |
93a8c3cd | 118 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 119 | BUG_ON(!list_empty(&fi->queued_writes)); |
07e77dca | 120 | kfree(fi->forget); |
fa0d7e3d | 121 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
122 | } |
123 | ||
b57922d9 | 124 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 125 | { |
91b0abe3 | 126 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 127 | clear_inode(inode); |
1e9a4ed9 MS |
128 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
129 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
131 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
132 | fi->forget = NULL; | |
e5e5558e | 133 | } |
d8a5ba45 MS |
134 | } |
135 | ||
71421259 MS |
136 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
137 | { | |
02b9984d | 138 | sync_filesystem(sb); |
71421259 MS |
139 | if (*flags & MS_MANDLOCK) |
140 | return -EINVAL; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
45c72cd7 PS |
145 | /* |
146 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
147 | * so that it will fit. | |
148 | */ | |
149 | static ino_t fuse_squash_ino(u64 ino64) | |
150 | { | |
151 | ino_t ino = (ino_t) ino64; | |
152 | if (sizeof(ino_t) < sizeof(u64)) | |
153 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
154 | return ino; | |
155 | } | |
156 | ||
3be5a52b MS |
157 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
158 | u64 attr_valid) | |
d8a5ba45 | 159 | { |
9ffbb916 | 160 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 161 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 162 | |
1fb69e78 MS |
163 | fi->attr_version = ++fc->attr_version; |
164 | fi->i_time = attr_valid; | |
165 | ||
45c72cd7 | 166 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 167 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 168 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
169 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
170 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
171 | inode->i_blocks = attr->blocks; |
172 | inode->i_atime.tv_sec = attr->atime; | |
173 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
174 | /* mtime from server may be stale due to local buffered write */ |
175 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
176 | inode->i_mtime.tv_sec = attr->mtime; | |
177 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
178 | inode->i_ctime.tv_sec = attr->ctime; |
179 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 180 | } |
e00d2c2d | 181 | |
0e9663ee MS |
182 | if (attr->blksize != 0) |
183 | inode->i_blkbits = ilog2(attr->blksize); | |
184 | else | |
185 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
186 | ||
ebc14c4d MS |
187 | /* |
188 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
189 | * to check permissions. This prevents failures due to the | |
190 | * check in may_delete(). | |
191 | */ | |
192 | fi->orig_i_mode = inode->i_mode; | |
193 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
194 | inode->i_mode &= ~S_ISVTX; | |
45c72cd7 PS |
195 | |
196 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
197 | } |
198 | ||
199 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
200 | u64 attr_valid, u64 attr_version) | |
201 | { | |
202 | struct fuse_conn *fc = get_fuse_conn(inode); | |
203 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 204 | bool is_wb = fc->writeback_cache; |
3be5a52b | 205 | loff_t oldsize; |
eed2179e | 206 | struct timespec old_mtime; |
3be5a52b MS |
207 | |
208 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
209 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
210 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
211 | spin_unlock(&fc->lock); |
212 | return; | |
213 | } | |
214 | ||
eed2179e | 215 | old_mtime = inode->i_mtime; |
3be5a52b | 216 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 217 | |
e00d2c2d | 218 | oldsize = inode->i_size; |
8373200b PE |
219 | /* |
220 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
221 | * extend local i_size without keeping userspace server in sync. So, | |
222 | * attr->size coming from server can be stale. We cannot trust it. | |
223 | */ | |
224 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
225 | i_size_write(inode, attr->size); | |
e00d2c2d MS |
226 | spin_unlock(&fc->lock); |
227 | ||
8373200b | 228 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
229 | bool inval = false; |
230 | ||
231 | if (oldsize != attr->size) { | |
7caef267 | 232 | truncate_pagecache(inode, attr->size); |
eed2179e BF |
233 | inval = true; |
234 | } else if (fc->auto_inval_data) { | |
235 | struct timespec new_mtime = { | |
236 | .tv_sec = attr->mtime, | |
237 | .tv_nsec = attr->mtimensec, | |
238 | }; | |
239 | ||
240 | /* | |
241 | * Auto inval mode also checks and invalidates if mtime | |
242 | * has changed. | |
243 | */ | |
244 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
245 | inval = true; | |
246 | } | |
247 | ||
248 | if (inval) | |
249 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 250 | } |
d8a5ba45 MS |
251 | } |
252 | ||
253 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
254 | { | |
255 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 256 | inode->i_size = attr->size; |
b0aa7606 MP |
257 | inode->i_mtime.tv_sec = attr->mtime; |
258 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
259 | inode->i_ctime.tv_sec = attr->ctime; |
260 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
261 | if (S_ISREG(inode->i_mode)) { |
262 | fuse_init_common(inode); | |
b6aeaded | 263 | fuse_init_file_inode(inode); |
e5e5558e MS |
264 | } else if (S_ISDIR(inode->i_mode)) |
265 | fuse_init_dir(inode); | |
266 | else if (S_ISLNK(inode->i_mode)) | |
267 | fuse_init_symlink(inode); | |
268 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
269 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
270 | fuse_init_common(inode); | |
271 | init_special_inode(inode, inode->i_mode, | |
272 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
273 | } else |
274 | BUG(); | |
d8a5ba45 MS |
275 | } |
276 | ||
3b463ae0 | 277 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 278 | { |
b48badf0 | 279 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
280 | if (get_node_id(inode) == nodeid) |
281 | return 1; | |
282 | else | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
287 | { | |
b48badf0 | 288 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
289 | get_fuse_inode(inode)->nodeid = nodeid; |
290 | return 0; | |
291 | } | |
292 | ||
b48badf0 | 293 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
294 | int generation, struct fuse_attr *attr, |
295 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
296 | { |
297 | struct inode *inode; | |
9e6268db | 298 | struct fuse_inode *fi; |
d8a5ba45 | 299 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
300 | |
301 | retry: | |
302 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
303 | if (!inode) | |
304 | return NULL; | |
305 | ||
306 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 307 | inode->i_flags |= S_NOATIME; |
d31433c8 | 308 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 309 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 MS |
310 | inode->i_generation = generation; |
311 | inode->i_data.backing_dev_info = &fc->bdi; | |
312 | fuse_init_inode(inode, attr); | |
313 | unlock_new_inode(inode); | |
314 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
315 | /* Inode has changed type, any I/O on the old should fail */ |
316 | make_bad_inode(inode); | |
317 | iput(inode); | |
d8a5ba45 MS |
318 | goto retry; |
319 | } | |
320 | ||
9e6268db | 321 | fi = get_fuse_inode(inode); |
8da5ff23 | 322 | spin_lock(&fc->lock); |
1729a16c | 323 | fi->nlookup++; |
8da5ff23 | 324 | spin_unlock(&fc->lock); |
1fb69e78 MS |
325 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
326 | ||
d8a5ba45 MS |
327 | return inode; |
328 | } | |
329 | ||
3b463ae0 JM |
330 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
331 | loff_t offset, loff_t len) | |
332 | { | |
333 | struct inode *inode; | |
334 | pgoff_t pg_start; | |
335 | pgoff_t pg_end; | |
336 | ||
337 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
338 | if (!inode) | |
339 | return -ENOENT; | |
340 | ||
341 | fuse_invalidate_attr(inode); | |
342 | if (offset >= 0) { | |
343 | pg_start = offset >> PAGE_CACHE_SHIFT; | |
344 | if (len <= 0) | |
345 | pg_end = -1; | |
346 | else | |
347 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
348 | invalidate_inode_pages2_range(inode->i_mapping, | |
349 | pg_start, pg_end); | |
350 | } | |
351 | iput(inode); | |
352 | return 0; | |
353 | } | |
354 | ||
42faad99 | 355 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 356 | { |
42faad99 | 357 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
358 | } |
359 | ||
0ec7ca41 MS |
360 | static void fuse_send_destroy(struct fuse_conn *fc) |
361 | { | |
362 | struct fuse_req *req = fc->destroy_req; | |
363 | if (req && fc->conn_init) { | |
364 | fc->destroy_req = NULL; | |
365 | req->in.h.opcode = FUSE_DESTROY; | |
366 | req->force = 1; | |
8b41e671 | 367 | req->background = 0; |
b93f858a | 368 | fuse_request_send(fc, req); |
0ec7ca41 MS |
369 | fuse_put_request(fc, req); |
370 | } | |
371 | } | |
372 | ||
a325f9b9 | 373 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 374 | { |
a325f9b9 TH |
375 | if (fc->bdi_initialized) |
376 | bdi_destroy(&fc->bdi); | |
377 | } | |
d8a5ba45 | 378 | |
08cbf542 | 379 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 380 | { |
d7133114 | 381 | spin_lock(&fc->lock); |
9ba7cbba | 382 | fc->connected = 0; |
51eb01e7 | 383 | fc->blocked = 0; |
796523fb | 384 | fc->initialized = 1; |
d7133114 | 385 | spin_unlock(&fc->lock); |
334f485d | 386 | /* Flush all readers on this fs */ |
385a17bf | 387 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 388 | wake_up_all(&fc->waitq); |
51eb01e7 | 389 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 390 | wake_up_all(&fc->reserved_req_waitq); |
a325f9b9 | 391 | } |
08cbf542 | 392 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
393 | |
394 | static void fuse_put_super(struct super_block *sb) | |
395 | { | |
396 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
397 | ||
398 | fuse_send_destroy(fc); | |
bbd99797 | 399 | |
a325f9b9 | 400 | fuse_conn_kill(fc); |
bbd99797 MS |
401 | mutex_lock(&fuse_mutex); |
402 | list_del(&fc->entry); | |
403 | fuse_ctl_remove_conn(fc); | |
404 | mutex_unlock(&fuse_mutex); | |
405 | fuse_bdi_destroy(fc); | |
406 | ||
bafa9654 | 407 | fuse_conn_put(fc); |
d8a5ba45 MS |
408 | } |
409 | ||
e5e5558e MS |
410 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
411 | { | |
412 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
413 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 414 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
415 | stbuf->f_blocks = attr->blocks; |
416 | stbuf->f_bfree = attr->bfree; | |
417 | stbuf->f_bavail = attr->bavail; | |
418 | stbuf->f_files = attr->files; | |
419 | stbuf->f_ffree = attr->ffree; | |
420 | stbuf->f_namelen = attr->namelen; | |
421 | /* fsid is left zero */ | |
422 | } | |
423 | ||
726c3342 | 424 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 425 | { |
726c3342 | 426 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
427 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
428 | struct fuse_req *req; | |
429 | struct fuse_statfs_out outarg; | |
430 | int err; | |
431 | ||
c2132c1b | 432 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
433 | buf->f_type = FUSE_SUPER_MAGIC; |
434 | return 0; | |
435 | } | |
436 | ||
b111c8c0 | 437 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
438 | if (IS_ERR(req)) |
439 | return PTR_ERR(req); | |
e5e5558e | 440 | |
de5f1202 | 441 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
442 | req->in.numargs = 0; |
443 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 444 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 445 | req->out.numargs = 1; |
de5f1202 MS |
446 | req->out.args[0].size = |
447 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 448 | req->out.args[0].value = &outarg; |
b93f858a | 449 | fuse_request_send(fc, req); |
e5e5558e MS |
450 | err = req->out.h.error; |
451 | if (!err) | |
452 | convert_fuse_statfs(buf, &outarg.st); | |
453 | fuse_put_request(fc, req); | |
454 | return err; | |
455 | } | |
456 | ||
d8a5ba45 MS |
457 | enum { |
458 | OPT_FD, | |
459 | OPT_ROOTMODE, | |
460 | OPT_USER_ID, | |
87729a55 | 461 | OPT_GROUP_ID, |
d8a5ba45 MS |
462 | OPT_DEFAULT_PERMISSIONS, |
463 | OPT_ALLOW_OTHER, | |
db50b96c | 464 | OPT_MAX_READ, |
d8091614 | 465 | OPT_BLKSIZE, |
d8a5ba45 MS |
466 | OPT_ERR |
467 | }; | |
468 | ||
a447c093 | 469 | static const match_table_t tokens = { |
d8a5ba45 MS |
470 | {OPT_FD, "fd=%u"}, |
471 | {OPT_ROOTMODE, "rootmode=%o"}, | |
472 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 473 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
474 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
475 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 476 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 477 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
478 | {OPT_ERR, NULL} |
479 | }; | |
480 | ||
d8091614 | 481 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
482 | { |
483 | char *p; | |
484 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 485 | d->max_read = ~0; |
d1875dba | 486 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
487 | |
488 | while ((p = strsep(&opt, ",")) != NULL) { | |
489 | int token; | |
490 | int value; | |
491 | substring_t args[MAX_OPT_ARGS]; | |
492 | if (!*p) | |
493 | continue; | |
494 | ||
495 | token = match_token(p, tokens, args); | |
496 | switch (token) { | |
497 | case OPT_FD: | |
498 | if (match_int(&args[0], &value)) | |
499 | return 0; | |
500 | d->fd = value; | |
5a533682 | 501 | d->fd_present = 1; |
d8a5ba45 MS |
502 | break; |
503 | ||
504 | case OPT_ROOTMODE: | |
505 | if (match_octal(&args[0], &value)) | |
506 | return 0; | |
a5bfffac TS |
507 | if (!fuse_valid_type(value)) |
508 | return 0; | |
d8a5ba45 | 509 | d->rootmode = value; |
5a533682 | 510 | d->rootmode_present = 1; |
d8a5ba45 MS |
511 | break; |
512 | ||
513 | case OPT_USER_ID: | |
514 | if (match_int(&args[0], &value)) | |
515 | return 0; | |
499dcf20 EB |
516 | d->user_id = make_kuid(current_user_ns(), value); |
517 | if (!uid_valid(d->user_id)) | |
518 | return 0; | |
5a533682 | 519 | d->user_id_present = 1; |
d8a5ba45 MS |
520 | break; |
521 | ||
87729a55 MS |
522 | case OPT_GROUP_ID: |
523 | if (match_int(&args[0], &value)) | |
524 | return 0; | |
499dcf20 EB |
525 | d->group_id = make_kgid(current_user_ns(), value); |
526 | if (!gid_valid(d->group_id)) | |
527 | return 0; | |
5a533682 | 528 | d->group_id_present = 1; |
87729a55 MS |
529 | break; |
530 | ||
1e9a4ed9 MS |
531 | case OPT_DEFAULT_PERMISSIONS: |
532 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
533 | break; | |
534 | ||
535 | case OPT_ALLOW_OTHER: | |
536 | d->flags |= FUSE_ALLOW_OTHER; | |
537 | break; | |
538 | ||
db50b96c MS |
539 | case OPT_MAX_READ: |
540 | if (match_int(&args[0], &value)) | |
541 | return 0; | |
542 | d->max_read = value; | |
543 | break; | |
544 | ||
d8091614 MS |
545 | case OPT_BLKSIZE: |
546 | if (!is_bdev || match_int(&args[0], &value)) | |
547 | return 0; | |
548 | d->blksize = value; | |
549 | break; | |
550 | ||
d8a5ba45 MS |
551 | default: |
552 | return 0; | |
553 | } | |
554 | } | |
5a533682 MS |
555 | |
556 | if (!d->fd_present || !d->rootmode_present || | |
557 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
558 | return 0; |
559 | ||
560 | return 1; | |
561 | } | |
562 | ||
34c80b1d | 563 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 564 | { |
34c80b1d AV |
565 | struct super_block *sb = root->d_sb; |
566 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 567 | |
499dcf20 EB |
568 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
569 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
1e9a4ed9 MS |
570 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
571 | seq_puts(m, ",default_permissions"); | |
572 | if (fc->flags & FUSE_ALLOW_OTHER) | |
573 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
574 | if (fc->max_read != ~0) |
575 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
576 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
577 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
578 | return 0; |
579 | } | |
580 | ||
a325f9b9 | 581 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 582 | { |
0d179aa5 TH |
583 | memset(fc, 0, sizeof(*fc)); |
584 | spin_lock_init(&fc->lock); | |
3b463ae0 | 585 | init_rwsem(&fc->killsb); |
0d179aa5 TH |
586 | atomic_set(&fc->count, 1); |
587 | init_waitqueue_head(&fc->waitq); | |
588 | init_waitqueue_head(&fc->blocked_waitq); | |
589 | init_waitqueue_head(&fc->reserved_req_waitq); | |
590 | INIT_LIST_HEAD(&fc->pending); | |
591 | INIT_LIST_HEAD(&fc->processing); | |
592 | INIT_LIST_HEAD(&fc->io); | |
593 | INIT_LIST_HEAD(&fc->interrupts); | |
594 | INIT_LIST_HEAD(&fc->bg_queue); | |
595 | INIT_LIST_HEAD(&fc->entry); | |
07e77dca | 596 | fc->forget_list_tail = &fc->forget_list_head; |
0d179aa5 | 597 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
598 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
599 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
600 | fc->khctr = 0; |
601 | fc->polled_files = RB_ROOT; | |
0d179aa5 | 602 | fc->reqctr = 0; |
0aada884 | 603 | fc->blocked = 0; |
796523fb | 604 | fc->initialized = 0; |
0d179aa5 TH |
605 | fc->attr_version = 1; |
606 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 607 | } |
0d179aa5 | 608 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 609 | |
bafa9654 MS |
610 | void fuse_conn_put(struct fuse_conn *fc) |
611 | { | |
d2a85164 | 612 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
613 | if (fc->destroy_req) |
614 | fuse_request_free(fc->destroy_req); | |
43901aab | 615 | fc->release(fc); |
d2a85164 | 616 | } |
bafa9654 | 617 | } |
08cbf542 | 618 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
619 | |
620 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
621 | { | |
622 | atomic_inc(&fc->count); | |
623 | return fc; | |
624 | } | |
08cbf542 | 625 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 626 | |
b93f858a | 627 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
628 | { |
629 | struct fuse_attr attr; | |
630 | memset(&attr, 0, sizeof(attr)); | |
631 | ||
632 | attr.mode = mode; | |
633 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 634 | attr.nlink = 1; |
1fb69e78 | 635 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
636 | } |
637 | ||
1729a16c | 638 | struct fuse_inode_handle { |
dbd561d2 MS |
639 | u64 nodeid; |
640 | u32 generation; | |
641 | }; | |
642 | ||
643 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
644 | struct fuse_inode_handle *handle) | |
645 | { | |
33670fa2 | 646 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
647 | struct inode *inode; |
648 | struct dentry *entry; | |
649 | int err = -ESTALE; | |
650 | ||
651 | if (handle->nodeid == 0) | |
652 | goto out_err; | |
653 | ||
654 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
655 | if (!inode) { |
656 | struct fuse_entry_out outarg; | |
657 | struct qstr name; | |
658 | ||
659 | if (!fc->export_support) | |
660 | goto out_err; | |
661 | ||
662 | name.len = 1; | |
663 | name.name = "."; | |
664 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
665 | &inode); | |
666 | if (err && err != -ENOENT) | |
667 | goto out_err; | |
668 | if (err || !inode) { | |
669 | err = -ESTALE; | |
670 | goto out_err; | |
671 | } | |
672 | err = -EIO; | |
673 | if (get_node_id(inode) != handle->nodeid) | |
674 | goto out_iput; | |
675 | } | |
dbd561d2 MS |
676 | err = -ESTALE; |
677 | if (inode->i_generation != handle->generation) | |
678 | goto out_iput; | |
679 | ||
44003728 | 680 | entry = d_obtain_alias(inode); |
c35eebe9 | 681 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 682 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
683 | |
684 | return entry; | |
685 | ||
686 | out_iput: | |
687 | iput(inode); | |
688 | out_err: | |
689 | return ERR_PTR(err); | |
690 | } | |
691 | ||
b0b0382b AV |
692 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
693 | struct inode *parent) | |
dbd561d2 | 694 | { |
b0b0382b | 695 | int len = parent ? 6 : 3; |
dbd561d2 MS |
696 | u64 nodeid; |
697 | u32 generation; | |
698 | ||
5fe0c237 AK |
699 | if (*max_len < len) { |
700 | *max_len = len; | |
94e07a75 | 701 | return FILEID_INVALID; |
5fe0c237 | 702 | } |
dbd561d2 MS |
703 | |
704 | nodeid = get_fuse_inode(inode)->nodeid; | |
705 | generation = inode->i_generation; | |
706 | ||
707 | fh[0] = (u32)(nodeid >> 32); | |
708 | fh[1] = (u32)(nodeid & 0xffffffff); | |
709 | fh[2] = generation; | |
710 | ||
b0b0382b | 711 | if (parent) { |
dbd561d2 MS |
712 | nodeid = get_fuse_inode(parent)->nodeid; |
713 | generation = parent->i_generation; | |
dbd561d2 MS |
714 | |
715 | fh[3] = (u32)(nodeid >> 32); | |
716 | fh[4] = (u32)(nodeid & 0xffffffff); | |
717 | fh[5] = generation; | |
718 | } | |
719 | ||
720 | *max_len = len; | |
b0b0382b | 721 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
722 | } |
723 | ||
724 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
725 | struct fid *fid, int fh_len, int fh_type) | |
726 | { | |
727 | struct fuse_inode_handle handle; | |
728 | ||
729 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
730 | return NULL; | |
731 | ||
732 | handle.nodeid = (u64) fid->raw[0] << 32; | |
733 | handle.nodeid |= (u64) fid->raw[1]; | |
734 | handle.generation = fid->raw[2]; | |
735 | return fuse_get_dentry(sb, &handle); | |
736 | } | |
737 | ||
738 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
739 | struct fid *fid, int fh_len, int fh_type) | |
740 | { | |
741 | struct fuse_inode_handle parent; | |
742 | ||
743 | if (fh_type != 0x82 || fh_len < 6) | |
744 | return NULL; | |
745 | ||
746 | parent.nodeid = (u64) fid->raw[3] << 32; | |
747 | parent.nodeid |= (u64) fid->raw[4]; | |
748 | parent.generation = fid->raw[5]; | |
749 | return fuse_get_dentry(sb, &parent); | |
750 | } | |
751 | ||
33670fa2 MS |
752 | static struct dentry *fuse_get_parent(struct dentry *child) |
753 | { | |
754 | struct inode *child_inode = child->d_inode; | |
755 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
756 | struct inode *inode; | |
757 | struct dentry *parent; | |
758 | struct fuse_entry_out outarg; | |
759 | struct qstr name; | |
760 | int err; | |
761 | ||
762 | if (!fc->export_support) | |
763 | return ERR_PTR(-ESTALE); | |
764 | ||
765 | name.len = 2; | |
766 | name.name = ".."; | |
767 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
768 | &name, &outarg, &inode); | |
44003728 CH |
769 | if (err) { |
770 | if (err == -ENOENT) | |
771 | return ERR_PTR(-ESTALE); | |
33670fa2 | 772 | return ERR_PTR(err); |
33670fa2 | 773 | } |
44003728 CH |
774 | |
775 | parent = d_obtain_alias(inode); | |
c35eebe9 | 776 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 777 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
778 | |
779 | return parent; | |
780 | } | |
dbd561d2 MS |
781 | |
782 | static const struct export_operations fuse_export_operations = { | |
783 | .fh_to_dentry = fuse_fh_to_dentry, | |
784 | .fh_to_parent = fuse_fh_to_parent, | |
785 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 786 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
787 | }; |
788 | ||
ee9b6d61 | 789 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
790 | .alloc_inode = fuse_alloc_inode, |
791 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 792 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 793 | .write_inode = fuse_write_inode, |
ead5f0b5 | 794 | .drop_inode = generic_delete_inode, |
71421259 | 795 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 796 | .put_super = fuse_put_super, |
69a53bf2 | 797 | .umount_begin = fuse_umount_begin, |
e5e5558e | 798 | .statfs = fuse_statfs, |
d8a5ba45 MS |
799 | .show_options = fuse_show_options, |
800 | }; | |
801 | ||
487ea5af CH |
802 | static void sanitize_global_limit(unsigned *limit) |
803 | { | |
804 | if (*limit == 0) | |
0ed5fd13 | 805 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
806 | sizeof(struct fuse_req); |
807 | ||
808 | if (*limit >= 1 << 16) | |
809 | *limit = (1 << 16) - 1; | |
810 | } | |
811 | ||
812 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
813 | { | |
814 | int rv; | |
815 | ||
816 | rv = param_set_uint(val, kp); | |
817 | if (rv) | |
818 | return rv; | |
819 | ||
820 | sanitize_global_limit((unsigned *)kp->arg); | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
825 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
826 | { | |
827 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
828 | ||
829 | if (arg->minor < 13) | |
830 | return; | |
831 | ||
832 | sanitize_global_limit(&max_user_bgreq); | |
833 | sanitize_global_limit(&max_user_congthresh); | |
834 | ||
835 | if (arg->max_background) { | |
836 | fc->max_background = arg->max_background; | |
837 | ||
838 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
839 | fc->max_background = max_user_bgreq; | |
840 | } | |
841 | if (arg->congestion_threshold) { | |
842 | fc->congestion_threshold = arg->congestion_threshold; | |
843 | ||
844 | if (!cap_sys_admin && | |
845 | fc->congestion_threshold > max_user_congthresh) | |
846 | fc->congestion_threshold = max_user_congthresh; | |
847 | } | |
848 | } | |
849 | ||
9b9a0469 MS |
850 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
851 | { | |
9b9a0469 MS |
852 | struct fuse_init_out *arg = &req->misc.init_out; |
853 | ||
854 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
855 | fc->conn_error = 1; | |
856 | else { | |
9cd68455 MS |
857 | unsigned long ra_pages; |
858 | ||
487ea5af CH |
859 | process_init_limits(fc, arg); |
860 | ||
9cd68455 MS |
861 | if (arg->minor >= 6) { |
862 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
863 | if (arg->flags & FUSE_ASYNC_READ) | |
864 | fc->async_read = 1; | |
71421259 MS |
865 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
866 | fc->no_lock = 1; | |
37fb3a30 MS |
867 | if (arg->minor >= 17) { |
868 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
869 | fc->no_flock = 1; | |
24114504 MS |
870 | } else { |
871 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
872 | fc->no_flock = 1; | |
37fb3a30 | 873 | } |
6ff958ed MS |
874 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
875 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
876 | if (arg->minor >= 9) { |
877 | /* LOOKUP has dependency on proto version */ | |
878 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
879 | fc->export_support = 1; | |
880 | } | |
78bb6cb9 MS |
881 | if (arg->flags & FUSE_BIG_WRITES) |
882 | fc->big_writes = 1; | |
e0a43ddc MS |
883 | if (arg->flags & FUSE_DONT_MASK) |
884 | fc->dont_mask = 1; | |
72d0d248 BF |
885 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
886 | fc->auto_inval_data = 1; | |
28420dad | 887 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 888 | fc->do_readdirplus = 1; |
28420dad MS |
889 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
890 | fc->readdirplus_auto = 1; | |
891 | } | |
60b9df7a MS |
892 | if (arg->flags & FUSE_ASYNC_DIO) |
893 | fc->async_dio = 1; | |
4d99ff8f PE |
894 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
895 | fc->writeback_cache = 1; | |
e27c9d38 MS |
896 | if (arg->time_gran && arg->time_gran <= 1000000000) |
897 | fc->sb->s_time_gran = arg->time_gran; | |
898 | else | |
899 | fc->sb->s_time_gran = 1000000000; | |
900 | ||
71421259 | 901 | } else { |
9cd68455 | 902 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 | 903 | fc->no_lock = 1; |
37fb3a30 | 904 | fc->no_flock = 1; |
71421259 | 905 | } |
9cd68455 MS |
906 | |
907 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
908 | fc->minor = arg->minor; |
909 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 910 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 911 | fc->conn_init = 1; |
9b9a0469 | 912 | } |
796523fb | 913 | fc->initialized = 1; |
08a53cdc | 914 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
915 | } |
916 | ||
ce1d5a49 | 917 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 918 | { |
9b9a0469 | 919 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 920 | |
9b9a0469 MS |
921 | arg->major = FUSE_KERNEL_VERSION; |
922 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 923 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 924 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 925 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 926 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
0b05b183 | 927 | FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f PE |
928 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
929 | FUSE_WRITEBACK_CACHE; | |
9b9a0469 MS |
930 | req->in.h.opcode = FUSE_INIT; |
931 | req->in.numargs = 1; | |
932 | req->in.args[0].size = sizeof(*arg); | |
933 | req->in.args[0].value = arg; | |
934 | req->out.numargs = 1; | |
3ad2f3fb | 935 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
936 | with interface version < 7.5. Rest of init_out is zeroed |
937 | by do_get_request(), so a short reply is not a problem */ | |
938 | req->out.argvar = 1; | |
939 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
940 | req->out.args[0].value = &req->misc.init_out; | |
941 | req->end = process_init_reply; | |
b93f858a | 942 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
943 | } |
944 | ||
43901aab TH |
945 | static void fuse_free_conn(struct fuse_conn *fc) |
946 | { | |
dd3e2c55 | 947 | kfree_rcu(fc, rcu); |
43901aab TH |
948 | } |
949 | ||
a325f9b9 TH |
950 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
951 | { | |
952 | int err; | |
953 | ||
d993831f | 954 | fc->bdi.name = "fuse"; |
a325f9b9 | 955 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
a325f9b9 | 956 | /* fuse does it's own writeback accounting */ |
5a537485 | 957 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; |
a325f9b9 TH |
958 | |
959 | err = bdi_init(&fc->bdi); | |
960 | if (err) | |
961 | return err; | |
962 | ||
963 | fc->bdi_initialized = 1; | |
964 | ||
965 | if (sb->s_bdev) { | |
966 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
967 | MAJOR(fc->dev), MINOR(fc->dev)); | |
968 | } else { | |
969 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
970 | } | |
971 | ||
972 | if (err) | |
973 | return err; | |
974 | ||
975 | /* | |
976 | * For a single fuse filesystem use max 1% of dirty + | |
977 | * writeback threshold. | |
978 | * | |
979 | * This gives about 1M of write buffer for memory maps on a | |
980 | * machine with 1G and 10% dirty_ratio, which should be more | |
981 | * than enough. | |
982 | * | |
983 | * Privileged users can raise it by writing to | |
984 | * | |
985 | * /sys/class/bdi/<bdi>/max_ratio | |
986 | */ | |
987 | bdi_set_max_ratio(&fc->bdi, 1); | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
d8a5ba45 MS |
992 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
993 | { | |
994 | struct fuse_conn *fc; | |
995 | struct inode *root; | |
996 | struct fuse_mount_data d; | |
997 | struct file *file; | |
f543f253 | 998 | struct dentry *root_dentry; |
ce1d5a49 | 999 | struct fuse_req *init_req; |
d8a5ba45 | 1000 | int err; |
d8091614 | 1001 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1002 | |
c2b8f006 | 1003 | err = -EINVAL; |
71421259 | 1004 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 1005 | goto err; |
71421259 | 1006 | |
9e1f1de0 AV |
1007 | sb->s_flags &= ~MS_NOSEC; |
1008 | ||
d8091614 | 1009 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 1010 | goto err; |
d8a5ba45 | 1011 | |
d8091614 | 1012 | if (is_bdev) { |
875d95ec | 1013 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1014 | err = -EINVAL; |
d8091614 | 1015 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1016 | goto err; |
875d95ec | 1017 | #endif |
d8091614 MS |
1018 | } else { |
1019 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1020 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1021 | } | |
d8a5ba45 MS |
1022 | sb->s_magic = FUSE_SUPER_MAGIC; |
1023 | sb->s_op = &fuse_super_operations; | |
1024 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
0a2da9b2 | 1025 | sb->s_time_gran = 1; |
dbd561d2 | 1026 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1027 | |
1028 | file = fget(d.fd); | |
c2b8f006 | 1029 | err = -EINVAL; |
d8a5ba45 | 1030 | if (!file) |
c2b8f006 | 1031 | goto err; |
d8a5ba45 | 1032 | |
499dcf20 EB |
1033 | if ((file->f_op != &fuse_dev_operations) || |
1034 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1035 | goto err_fput; |
0720b315 | 1036 | |
0d179aa5 | 1037 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1038 | err = -ENOMEM; |
1039 | if (!fc) | |
1040 | goto err_fput; | |
d8a5ba45 | 1041 | |
a325f9b9 TH |
1042 | fuse_conn_init(fc); |
1043 | ||
1044 | fc->dev = sb->s_dev; | |
3b463ae0 | 1045 | fc->sb = sb; |
a325f9b9 TH |
1046 | err = fuse_bdi_init(fc, sb); |
1047 | if (err) | |
1048 | goto err_put_conn; | |
0d179aa5 | 1049 | |
32a88aa1 JA |
1050 | sb->s_bdi = &fc->bdi; |
1051 | ||
e0a43ddc MS |
1052 | /* Handle umasking inside the fuse code */ |
1053 | if (sb->s_flags & MS_POSIXACL) | |
1054 | fc->dont_mask = 1; | |
1055 | sb->s_flags |= MS_POSIXACL; | |
1056 | ||
43901aab | 1057 | fc->release = fuse_free_conn; |
1e9a4ed9 | 1058 | fc->flags = d.flags; |
d8a5ba45 | 1059 | fc->user_id = d.user_id; |
87729a55 | 1060 | fc->group_id = d.group_id; |
f948d564 | 1061 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1062 | |
f543f253 MS |
1063 | /* Used by get_root_inode() */ |
1064 | sb->s_fs_info = fc; | |
1065 | ||
d8a5ba45 | 1066 | err = -ENOMEM; |
b93f858a | 1067 | root = fuse_get_root_inode(sb, d.rootmode); |
48fde701 AV |
1068 | root_dentry = d_make_root(root); |
1069 | if (!root_dentry) | |
c2b8f006 | 1070 | goto err_put_conn; |
c35eebe9 AV |
1071 | /* only now - we want root dentry with NULL ->d_op */ |
1072 | sb->s_d_op = &fuse_dentry_operations; | |
f543f253 | 1073 | |
4250c066 | 1074 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1075 | if (!init_req) |
1076 | goto err_put_root; | |
8b41e671 | 1077 | init_req->background = 1; |
ce1d5a49 | 1078 | |
0ec7ca41 | 1079 | if (is_bdev) { |
4250c066 | 1080 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1081 | if (!fc->destroy_req) |
17e18ab6 | 1082 | goto err_free_init_req; |
0ec7ca41 MS |
1083 | } |
1084 | ||
bafa9654 | 1085 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1086 | err = -EINVAL; |
1087 | if (file->private_data) | |
bafa9654 | 1088 | goto err_unlock; |
8aa09a50 | 1089 | |
bafa9654 MS |
1090 | err = fuse_ctl_add_conn(fc); |
1091 | if (err) | |
1092 | goto err_unlock; | |
1093 | ||
1094 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1095 | sb->s_root = root_dentry; |
f543f253 | 1096 | fc->connected = 1; |
bafa9654 MS |
1097 | file->private_data = fuse_conn_get(fc); |
1098 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
1099 | /* |
1100 | * atomic_dec_and_test() in fput() provides the necessary | |
1101 | * memory barrier for file->private_data to be visible on all | |
1102 | * CPUs after this | |
1103 | */ | |
1104 | fput(file); | |
f543f253 | 1105 | |
ce1d5a49 | 1106 | fuse_send_init(fc, init_req); |
f543f253 | 1107 | |
d8a5ba45 MS |
1108 | return 0; |
1109 | ||
bafa9654 MS |
1110 | err_unlock: |
1111 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1112 | err_free_init_req: |
ce1d5a49 | 1113 | fuse_request_free(init_req); |
f543f253 MS |
1114 | err_put_root: |
1115 | dput(root_dentry); | |
c2b8f006 | 1116 | err_put_conn: |
a325f9b9 | 1117 | fuse_bdi_destroy(fc); |
bafa9654 | 1118 | fuse_conn_put(fc); |
c2b8f006 MS |
1119 | err_fput: |
1120 | fput(file); | |
1121 | err: | |
d8a5ba45 MS |
1122 | return err; |
1123 | } | |
1124 | ||
3c26ff6e | 1125 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1126 | int flags, const char *dev_name, |
3c26ff6e | 1127 | void *raw_data) |
d8a5ba45 | 1128 | { |
3c26ff6e | 1129 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1130 | } |
1131 | ||
3b463ae0 JM |
1132 | static void fuse_kill_sb_anon(struct super_block *sb) |
1133 | { | |
1134 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1135 | ||
1136 | if (fc) { | |
1137 | down_write(&fc->killsb); | |
1138 | fc->sb = NULL; | |
1139 | up_write(&fc->killsb); | |
1140 | } | |
1141 | ||
1142 | kill_anon_super(sb); | |
1143 | } | |
1144 | ||
875d95ec MS |
1145 | static struct file_system_type fuse_fs_type = { |
1146 | .owner = THIS_MODULE, | |
1147 | .name = "fuse", | |
79c0b2df | 1148 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1149 | .mount = fuse_mount, |
3b463ae0 | 1150 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1151 | }; |
7f78e035 | 1152 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1153 | |
1154 | #ifdef CONFIG_BLOCK | |
152a0836 | 1155 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1156 | int flags, const char *dev_name, |
152a0836 | 1157 | void *raw_data) |
d6392f87 | 1158 | { |
152a0836 | 1159 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1160 | } |
1161 | ||
3b463ae0 JM |
1162 | static void fuse_kill_sb_blk(struct super_block *sb) |
1163 | { | |
1164 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1165 | ||
1166 | if (fc) { | |
1167 | down_write(&fc->killsb); | |
1168 | fc->sb = NULL; | |
1169 | up_write(&fc->killsb); | |
1170 | } | |
1171 | ||
1172 | kill_block_super(sb); | |
1173 | } | |
1174 | ||
d6392f87 MS |
1175 | static struct file_system_type fuseblk_fs_type = { |
1176 | .owner = THIS_MODULE, | |
1177 | .name = "fuseblk", | |
152a0836 | 1178 | .mount = fuse_mount_blk, |
3b463ae0 | 1179 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1180 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1181 | }; |
7f78e035 | 1182 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1183 | |
875d95ec MS |
1184 | static inline int register_fuseblk(void) |
1185 | { | |
1186 | return register_filesystem(&fuseblk_fs_type); | |
1187 | } | |
1188 | ||
1189 | static inline void unregister_fuseblk(void) | |
1190 | { | |
1191 | unregister_filesystem(&fuseblk_fs_type); | |
1192 | } | |
1193 | #else | |
1194 | static inline int register_fuseblk(void) | |
1195 | { | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | static inline void unregister_fuseblk(void) | |
1200 | { | |
1201 | } | |
1202 | #endif | |
1203 | ||
51cc5068 | 1204 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1205 | { |
1729a16c | 1206 | struct inode *inode = foo; |
d8a5ba45 | 1207 | |
a35afb83 | 1208 | inode_init_once(inode); |
d8a5ba45 MS |
1209 | } |
1210 | ||
1211 | static int __init fuse_fs_init(void) | |
1212 | { | |
1213 | int err; | |
1214 | ||
d6392f87 MS |
1215 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
1216 | sizeof(struct fuse_inode), | |
1217 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1218 | fuse_inode_init_once); |
d6392f87 MS |
1219 | err = -ENOMEM; |
1220 | if (!fuse_inode_cachep) | |
988f0325 AV |
1221 | goto out; |
1222 | ||
1223 | err = register_fuseblk(); | |
1224 | if (err) | |
1225 | goto out2; | |
1226 | ||
1227 | err = register_filesystem(&fuse_fs_type); | |
1228 | if (err) | |
1229 | goto out3; | |
d6392f87 MS |
1230 | |
1231 | return 0; | |
d8a5ba45 | 1232 | |
988f0325 | 1233 | out3: |
875d95ec | 1234 | unregister_fuseblk(); |
988f0325 AV |
1235 | out2: |
1236 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1237 | out: |
d8a5ba45 MS |
1238 | return err; |
1239 | } | |
1240 | ||
1241 | static void fuse_fs_cleanup(void) | |
1242 | { | |
1243 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1244 | unregister_fuseblk(); |
8c0a8537 KS |
1245 | |
1246 | /* | |
1247 | * Make sure all delayed rcu free inodes are flushed before we | |
1248 | * destroy cache. | |
1249 | */ | |
1250 | rcu_barrier(); | |
d8a5ba45 MS |
1251 | kmem_cache_destroy(fuse_inode_cachep); |
1252 | } | |
1253 | ||
5c89e17e GKH |
1254 | static struct kobject *fuse_kobj; |
1255 | static struct kobject *connections_kobj; | |
1256 | ||
f543f253 MS |
1257 | static int fuse_sysfs_init(void) |
1258 | { | |
1259 | int err; | |
1260 | ||
00d26666 | 1261 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1262 | if (!fuse_kobj) { |
1263 | err = -ENOMEM; | |
f543f253 | 1264 | goto out_err; |
5c89e17e | 1265 | } |
f543f253 | 1266 | |
5c89e17e GKH |
1267 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1268 | if (!connections_kobj) { | |
1269 | err = -ENOMEM; | |
f543f253 | 1270 | goto out_fuse_unregister; |
5c89e17e | 1271 | } |
f543f253 MS |
1272 | |
1273 | return 0; | |
1274 | ||
1275 | out_fuse_unregister: | |
197b12d6 | 1276 | kobject_put(fuse_kobj); |
f543f253 MS |
1277 | out_err: |
1278 | return err; | |
1279 | } | |
1280 | ||
1281 | static void fuse_sysfs_cleanup(void) | |
1282 | { | |
197b12d6 GKH |
1283 | kobject_put(connections_kobj); |
1284 | kobject_put(fuse_kobj); | |
f543f253 MS |
1285 | } |
1286 | ||
d8a5ba45 MS |
1287 | static int __init fuse_init(void) |
1288 | { | |
1289 | int res; | |
1290 | ||
1729a16c | 1291 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1292 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1293 | ||
bafa9654 | 1294 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1295 | res = fuse_fs_init(); |
1296 | if (res) | |
1297 | goto err; | |
1298 | ||
334f485d MS |
1299 | res = fuse_dev_init(); |
1300 | if (res) | |
1301 | goto err_fs_cleanup; | |
1302 | ||
f543f253 MS |
1303 | res = fuse_sysfs_init(); |
1304 | if (res) | |
1305 | goto err_dev_cleanup; | |
1306 | ||
bafa9654 MS |
1307 | res = fuse_ctl_init(); |
1308 | if (res) | |
1309 | goto err_sysfs_cleanup; | |
1310 | ||
487ea5af CH |
1311 | sanitize_global_limit(&max_user_bgreq); |
1312 | sanitize_global_limit(&max_user_congthresh); | |
1313 | ||
d8a5ba45 MS |
1314 | return 0; |
1315 | ||
bafa9654 MS |
1316 | err_sysfs_cleanup: |
1317 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1318 | err_dev_cleanup: |
1319 | fuse_dev_cleanup(); | |
334f485d MS |
1320 | err_fs_cleanup: |
1321 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1322 | err: |
1323 | return res; | |
1324 | } | |
1325 | ||
1326 | static void __exit fuse_exit(void) | |
1327 | { | |
1328 | printk(KERN_DEBUG "fuse exit\n"); | |
1329 | ||
bafa9654 | 1330 | fuse_ctl_cleanup(); |
f543f253 | 1331 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1332 | fuse_fs_cleanup(); |
334f485d | 1333 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1334 | } |
1335 | ||
1336 | module_init(fuse_init); | |
1337 | module_exit(fuse_exit); |