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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 | { |
b57922d9 | 126 | truncate_inode_pages(&inode->i_data, 0); |
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 | { | |
138 | if (*flags & MS_MANDLOCK) | |
139 | return -EINVAL; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
45c72cd7 PS |
144 | /* |
145 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
146 | * so that it will fit. | |
147 | */ | |
148 | static ino_t fuse_squash_ino(u64 ino64) | |
149 | { | |
150 | ino_t ino = (ino_t) ino64; | |
151 | if (sizeof(ino_t) < sizeof(u64)) | |
152 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
153 | return ino; | |
154 | } | |
155 | ||
3be5a52b MS |
156 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
157 | u64 attr_valid) | |
d8a5ba45 | 158 | { |
9ffbb916 | 159 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 160 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 161 | |
1fb69e78 MS |
162 | fi->attr_version = ++fc->attr_version; |
163 | fi->i_time = attr_valid; | |
164 | ||
45c72cd7 | 165 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 166 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 167 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
168 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
169 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
170 | inode->i_blocks = attr->blocks; |
171 | inode->i_atime.tv_sec = attr->atime; | |
172 | inode->i_atime.tv_nsec = attr->atimensec; | |
173 | inode->i_mtime.tv_sec = attr->mtime; | |
174 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
175 | inode->i_ctime.tv_sec = attr->ctime; | |
176 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 177 | |
0e9663ee MS |
178 | if (attr->blksize != 0) |
179 | inode->i_blkbits = ilog2(attr->blksize); | |
180 | else | |
181 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
182 | ||
ebc14c4d MS |
183 | /* |
184 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
185 | * to check permissions. This prevents failures due to the | |
186 | * check in may_delete(). | |
187 | */ | |
188 | fi->orig_i_mode = inode->i_mode; | |
189 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
190 | inode->i_mode &= ~S_ISVTX; | |
45c72cd7 PS |
191 | |
192 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
193 | } |
194 | ||
195 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
196 | u64 attr_valid, u64 attr_version) | |
197 | { | |
198 | struct fuse_conn *fc = get_fuse_conn(inode); | |
199 | struct fuse_inode *fi = get_fuse_inode(inode); | |
200 | loff_t oldsize; | |
eed2179e | 201 | struct timespec old_mtime; |
3be5a52b MS |
202 | |
203 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
204 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
205 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
206 | spin_unlock(&fc->lock); |
207 | return; | |
208 | } | |
209 | ||
eed2179e | 210 | old_mtime = inode->i_mtime; |
3be5a52b | 211 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 212 | |
e00d2c2d MS |
213 | oldsize = inode->i_size; |
214 | i_size_write(inode, attr->size); | |
215 | spin_unlock(&fc->lock); | |
216 | ||
eed2179e BF |
217 | if (S_ISREG(inode->i_mode)) { |
218 | bool inval = false; | |
219 | ||
220 | if (oldsize != attr->size) { | |
221 | truncate_pagecache(inode, oldsize, attr->size); | |
222 | inval = true; | |
223 | } else if (fc->auto_inval_data) { | |
224 | struct timespec new_mtime = { | |
225 | .tv_sec = attr->mtime, | |
226 | .tv_nsec = attr->mtimensec, | |
227 | }; | |
228 | ||
229 | /* | |
230 | * Auto inval mode also checks and invalidates if mtime | |
231 | * has changed. | |
232 | */ | |
233 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
234 | inval = true; | |
235 | } | |
236 | ||
237 | if (inval) | |
238 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 239 | } |
d8a5ba45 MS |
240 | } |
241 | ||
242 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
243 | { | |
244 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 245 | inode->i_size = attr->size; |
e5e5558e MS |
246 | if (S_ISREG(inode->i_mode)) { |
247 | fuse_init_common(inode); | |
b6aeaded | 248 | fuse_init_file_inode(inode); |
e5e5558e MS |
249 | } else if (S_ISDIR(inode->i_mode)) |
250 | fuse_init_dir(inode); | |
251 | else if (S_ISLNK(inode->i_mode)) | |
252 | fuse_init_symlink(inode); | |
253 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
254 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
255 | fuse_init_common(inode); | |
256 | init_special_inode(inode, inode->i_mode, | |
257 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
258 | } else |
259 | BUG(); | |
d8a5ba45 MS |
260 | } |
261 | ||
3b463ae0 | 262 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 263 | { |
b48badf0 | 264 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
265 | if (get_node_id(inode) == nodeid) |
266 | return 1; | |
267 | else | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
272 | { | |
b48badf0 | 273 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
274 | get_fuse_inode(inode)->nodeid = nodeid; |
275 | return 0; | |
276 | } | |
277 | ||
b48badf0 | 278 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
279 | int generation, struct fuse_attr *attr, |
280 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
281 | { |
282 | struct inode *inode; | |
9e6268db | 283 | struct fuse_inode *fi; |
d8a5ba45 | 284 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
285 | |
286 | retry: | |
287 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
288 | if (!inode) | |
289 | return NULL; | |
290 | ||
291 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 292 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
293 | inode->i_generation = generation; |
294 | inode->i_data.backing_dev_info = &fc->bdi; | |
295 | fuse_init_inode(inode, attr); | |
296 | unlock_new_inode(inode); | |
297 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
298 | /* Inode has changed type, any I/O on the old should fail */ |
299 | make_bad_inode(inode); | |
300 | iput(inode); | |
d8a5ba45 MS |
301 | goto retry; |
302 | } | |
303 | ||
9e6268db | 304 | fi = get_fuse_inode(inode); |
8da5ff23 | 305 | spin_lock(&fc->lock); |
1729a16c | 306 | fi->nlookup++; |
8da5ff23 | 307 | spin_unlock(&fc->lock); |
1fb69e78 MS |
308 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
309 | ||
d8a5ba45 MS |
310 | return inode; |
311 | } | |
312 | ||
3b463ae0 JM |
313 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
314 | loff_t offset, loff_t len) | |
315 | { | |
316 | struct inode *inode; | |
317 | pgoff_t pg_start; | |
318 | pgoff_t pg_end; | |
319 | ||
320 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
321 | if (!inode) | |
322 | return -ENOENT; | |
323 | ||
324 | fuse_invalidate_attr(inode); | |
325 | if (offset >= 0) { | |
326 | pg_start = offset >> PAGE_CACHE_SHIFT; | |
327 | if (len <= 0) | |
328 | pg_end = -1; | |
329 | else | |
330 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
331 | invalidate_inode_pages2_range(inode->i_mapping, | |
332 | pg_start, pg_end); | |
333 | } | |
334 | iput(inode); | |
335 | return 0; | |
336 | } | |
337 | ||
42faad99 | 338 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 339 | { |
42faad99 | 340 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
341 | } |
342 | ||
0ec7ca41 MS |
343 | static void fuse_send_destroy(struct fuse_conn *fc) |
344 | { | |
345 | struct fuse_req *req = fc->destroy_req; | |
346 | if (req && fc->conn_init) { | |
347 | fc->destroy_req = NULL; | |
348 | req->in.h.opcode = FUSE_DESTROY; | |
349 | req->force = 1; | |
8b41e671 | 350 | req->background = 0; |
b93f858a | 351 | fuse_request_send(fc, req); |
0ec7ca41 MS |
352 | fuse_put_request(fc, req); |
353 | } | |
354 | } | |
355 | ||
a325f9b9 | 356 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 357 | { |
a325f9b9 TH |
358 | if (fc->bdi_initialized) |
359 | bdi_destroy(&fc->bdi); | |
360 | } | |
d8a5ba45 | 361 | |
08cbf542 | 362 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 363 | { |
d7133114 | 364 | spin_lock(&fc->lock); |
9ba7cbba | 365 | fc->connected = 0; |
51eb01e7 | 366 | fc->blocked = 0; |
796523fb | 367 | fc->initialized = 1; |
d7133114 | 368 | spin_unlock(&fc->lock); |
334f485d | 369 | /* Flush all readers on this fs */ |
385a17bf | 370 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 371 | wake_up_all(&fc->waitq); |
51eb01e7 | 372 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 373 | wake_up_all(&fc->reserved_req_waitq); |
a325f9b9 | 374 | } |
08cbf542 | 375 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
376 | |
377 | static void fuse_put_super(struct super_block *sb) | |
378 | { | |
379 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
380 | ||
381 | fuse_send_destroy(fc); | |
bbd99797 | 382 | |
a325f9b9 | 383 | fuse_conn_kill(fc); |
bbd99797 MS |
384 | mutex_lock(&fuse_mutex); |
385 | list_del(&fc->entry); | |
386 | fuse_ctl_remove_conn(fc); | |
387 | mutex_unlock(&fuse_mutex); | |
388 | fuse_bdi_destroy(fc); | |
389 | ||
bafa9654 | 390 | fuse_conn_put(fc); |
d8a5ba45 MS |
391 | } |
392 | ||
e5e5558e MS |
393 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
394 | { | |
395 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
396 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 397 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
398 | stbuf->f_blocks = attr->blocks; |
399 | stbuf->f_bfree = attr->bfree; | |
400 | stbuf->f_bavail = attr->bavail; | |
401 | stbuf->f_files = attr->files; | |
402 | stbuf->f_ffree = attr->ffree; | |
403 | stbuf->f_namelen = attr->namelen; | |
404 | /* fsid is left zero */ | |
405 | } | |
406 | ||
726c3342 | 407 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 408 | { |
726c3342 | 409 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
410 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
411 | struct fuse_req *req; | |
412 | struct fuse_statfs_out outarg; | |
413 | int err; | |
414 | ||
c2132c1b | 415 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
416 | buf->f_type = FUSE_SUPER_MAGIC; |
417 | return 0; | |
418 | } | |
419 | ||
b111c8c0 | 420 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
421 | if (IS_ERR(req)) |
422 | return PTR_ERR(req); | |
e5e5558e | 423 | |
de5f1202 | 424 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
425 | req->in.numargs = 0; |
426 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 427 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 428 | req->out.numargs = 1; |
de5f1202 MS |
429 | req->out.args[0].size = |
430 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 431 | req->out.args[0].value = &outarg; |
b93f858a | 432 | fuse_request_send(fc, req); |
e5e5558e MS |
433 | err = req->out.h.error; |
434 | if (!err) | |
435 | convert_fuse_statfs(buf, &outarg.st); | |
436 | fuse_put_request(fc, req); | |
437 | return err; | |
438 | } | |
439 | ||
d8a5ba45 MS |
440 | enum { |
441 | OPT_FD, | |
442 | OPT_ROOTMODE, | |
443 | OPT_USER_ID, | |
87729a55 | 444 | OPT_GROUP_ID, |
d8a5ba45 MS |
445 | OPT_DEFAULT_PERMISSIONS, |
446 | OPT_ALLOW_OTHER, | |
db50b96c | 447 | OPT_MAX_READ, |
d8091614 | 448 | OPT_BLKSIZE, |
d8a5ba45 MS |
449 | OPT_ERR |
450 | }; | |
451 | ||
a447c093 | 452 | static const match_table_t tokens = { |
d8a5ba45 MS |
453 | {OPT_FD, "fd=%u"}, |
454 | {OPT_ROOTMODE, "rootmode=%o"}, | |
455 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 456 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
457 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
458 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 459 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 460 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
461 | {OPT_ERR, NULL} |
462 | }; | |
463 | ||
d8091614 | 464 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
465 | { |
466 | char *p; | |
467 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 468 | d->max_read = ~0; |
d1875dba | 469 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
470 | |
471 | while ((p = strsep(&opt, ",")) != NULL) { | |
472 | int token; | |
473 | int value; | |
474 | substring_t args[MAX_OPT_ARGS]; | |
475 | if (!*p) | |
476 | continue; | |
477 | ||
478 | token = match_token(p, tokens, args); | |
479 | switch (token) { | |
480 | case OPT_FD: | |
481 | if (match_int(&args[0], &value)) | |
482 | return 0; | |
483 | d->fd = value; | |
5a533682 | 484 | d->fd_present = 1; |
d8a5ba45 MS |
485 | break; |
486 | ||
487 | case OPT_ROOTMODE: | |
488 | if (match_octal(&args[0], &value)) | |
489 | return 0; | |
a5bfffac TS |
490 | if (!fuse_valid_type(value)) |
491 | return 0; | |
d8a5ba45 | 492 | d->rootmode = value; |
5a533682 | 493 | d->rootmode_present = 1; |
d8a5ba45 MS |
494 | break; |
495 | ||
496 | case OPT_USER_ID: | |
497 | if (match_int(&args[0], &value)) | |
498 | return 0; | |
499dcf20 EB |
499 | d->user_id = make_kuid(current_user_ns(), value); |
500 | if (!uid_valid(d->user_id)) | |
501 | return 0; | |
5a533682 | 502 | d->user_id_present = 1; |
d8a5ba45 MS |
503 | break; |
504 | ||
87729a55 MS |
505 | case OPT_GROUP_ID: |
506 | if (match_int(&args[0], &value)) | |
507 | return 0; | |
499dcf20 EB |
508 | d->group_id = make_kgid(current_user_ns(), value); |
509 | if (!gid_valid(d->group_id)) | |
510 | return 0; | |
5a533682 | 511 | d->group_id_present = 1; |
87729a55 MS |
512 | break; |
513 | ||
1e9a4ed9 MS |
514 | case OPT_DEFAULT_PERMISSIONS: |
515 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
516 | break; | |
517 | ||
518 | case OPT_ALLOW_OTHER: | |
519 | d->flags |= FUSE_ALLOW_OTHER; | |
520 | break; | |
521 | ||
db50b96c MS |
522 | case OPT_MAX_READ: |
523 | if (match_int(&args[0], &value)) | |
524 | return 0; | |
525 | d->max_read = value; | |
526 | break; | |
527 | ||
d8091614 MS |
528 | case OPT_BLKSIZE: |
529 | if (!is_bdev || match_int(&args[0], &value)) | |
530 | return 0; | |
531 | d->blksize = value; | |
532 | break; | |
533 | ||
d8a5ba45 MS |
534 | default: |
535 | return 0; | |
536 | } | |
537 | } | |
5a533682 MS |
538 | |
539 | if (!d->fd_present || !d->rootmode_present || | |
540 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
541 | return 0; |
542 | ||
543 | return 1; | |
544 | } | |
545 | ||
34c80b1d | 546 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 547 | { |
34c80b1d AV |
548 | struct super_block *sb = root->d_sb; |
549 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 550 | |
499dcf20 EB |
551 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
552 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
1e9a4ed9 MS |
553 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
554 | seq_puts(m, ",default_permissions"); | |
555 | if (fc->flags & FUSE_ALLOW_OTHER) | |
556 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
557 | if (fc->max_read != ~0) |
558 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
559 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
560 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
561 | return 0; |
562 | } | |
563 | ||
a325f9b9 | 564 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 565 | { |
0d179aa5 TH |
566 | memset(fc, 0, sizeof(*fc)); |
567 | spin_lock_init(&fc->lock); | |
568 | mutex_init(&fc->inst_mutex); | |
3b463ae0 | 569 | init_rwsem(&fc->killsb); |
0d179aa5 TH |
570 | atomic_set(&fc->count, 1); |
571 | init_waitqueue_head(&fc->waitq); | |
572 | init_waitqueue_head(&fc->blocked_waitq); | |
573 | init_waitqueue_head(&fc->reserved_req_waitq); | |
574 | INIT_LIST_HEAD(&fc->pending); | |
575 | INIT_LIST_HEAD(&fc->processing); | |
576 | INIT_LIST_HEAD(&fc->io); | |
577 | INIT_LIST_HEAD(&fc->interrupts); | |
578 | INIT_LIST_HEAD(&fc->bg_queue); | |
579 | INIT_LIST_HEAD(&fc->entry); | |
07e77dca | 580 | fc->forget_list_tail = &fc->forget_list_head; |
0d179aa5 | 581 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
582 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
583 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
584 | fc->khctr = 0; |
585 | fc->polled_files = RB_ROOT; | |
0d179aa5 | 586 | fc->reqctr = 0; |
0aada884 | 587 | fc->blocked = 0; |
796523fb | 588 | fc->initialized = 0; |
0d179aa5 TH |
589 | fc->attr_version = 1; |
590 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 591 | } |
0d179aa5 | 592 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 593 | |
bafa9654 MS |
594 | void fuse_conn_put(struct fuse_conn *fc) |
595 | { | |
d2a85164 | 596 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
597 | if (fc->destroy_req) |
598 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 599 | mutex_destroy(&fc->inst_mutex); |
43901aab | 600 | fc->release(fc); |
d2a85164 | 601 | } |
bafa9654 | 602 | } |
08cbf542 | 603 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
604 | |
605 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
606 | { | |
607 | atomic_inc(&fc->count); | |
608 | return fc; | |
609 | } | |
08cbf542 | 610 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 611 | |
b93f858a | 612 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
613 | { |
614 | struct fuse_attr attr; | |
615 | memset(&attr, 0, sizeof(attr)); | |
616 | ||
617 | attr.mode = mode; | |
618 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 619 | attr.nlink = 1; |
1fb69e78 | 620 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
621 | } |
622 | ||
1729a16c | 623 | struct fuse_inode_handle { |
dbd561d2 MS |
624 | u64 nodeid; |
625 | u32 generation; | |
626 | }; | |
627 | ||
628 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
629 | struct fuse_inode_handle *handle) | |
630 | { | |
33670fa2 | 631 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
632 | struct inode *inode; |
633 | struct dentry *entry; | |
634 | int err = -ESTALE; | |
635 | ||
636 | if (handle->nodeid == 0) | |
637 | goto out_err; | |
638 | ||
639 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
640 | if (!inode) { |
641 | struct fuse_entry_out outarg; | |
642 | struct qstr name; | |
643 | ||
644 | if (!fc->export_support) | |
645 | goto out_err; | |
646 | ||
647 | name.len = 1; | |
648 | name.name = "."; | |
649 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
650 | &inode); | |
651 | if (err && err != -ENOENT) | |
652 | goto out_err; | |
653 | if (err || !inode) { | |
654 | err = -ESTALE; | |
655 | goto out_err; | |
656 | } | |
657 | err = -EIO; | |
658 | if (get_node_id(inode) != handle->nodeid) | |
659 | goto out_iput; | |
660 | } | |
dbd561d2 MS |
661 | err = -ESTALE; |
662 | if (inode->i_generation != handle->generation) | |
663 | goto out_iput; | |
664 | ||
44003728 | 665 | entry = d_obtain_alias(inode); |
c35eebe9 | 666 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 667 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
668 | |
669 | return entry; | |
670 | ||
671 | out_iput: | |
672 | iput(inode); | |
673 | out_err: | |
674 | return ERR_PTR(err); | |
675 | } | |
676 | ||
b0b0382b AV |
677 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
678 | struct inode *parent) | |
dbd561d2 | 679 | { |
b0b0382b | 680 | int len = parent ? 6 : 3; |
dbd561d2 MS |
681 | u64 nodeid; |
682 | u32 generation; | |
683 | ||
5fe0c237 AK |
684 | if (*max_len < len) { |
685 | *max_len = len; | |
94e07a75 | 686 | return FILEID_INVALID; |
5fe0c237 | 687 | } |
dbd561d2 MS |
688 | |
689 | nodeid = get_fuse_inode(inode)->nodeid; | |
690 | generation = inode->i_generation; | |
691 | ||
692 | fh[0] = (u32)(nodeid >> 32); | |
693 | fh[1] = (u32)(nodeid & 0xffffffff); | |
694 | fh[2] = generation; | |
695 | ||
b0b0382b | 696 | if (parent) { |
dbd561d2 MS |
697 | nodeid = get_fuse_inode(parent)->nodeid; |
698 | generation = parent->i_generation; | |
dbd561d2 MS |
699 | |
700 | fh[3] = (u32)(nodeid >> 32); | |
701 | fh[4] = (u32)(nodeid & 0xffffffff); | |
702 | fh[5] = generation; | |
703 | } | |
704 | ||
705 | *max_len = len; | |
b0b0382b | 706 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
707 | } |
708 | ||
709 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
710 | struct fid *fid, int fh_len, int fh_type) | |
711 | { | |
712 | struct fuse_inode_handle handle; | |
713 | ||
714 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
715 | return NULL; | |
716 | ||
717 | handle.nodeid = (u64) fid->raw[0] << 32; | |
718 | handle.nodeid |= (u64) fid->raw[1]; | |
719 | handle.generation = fid->raw[2]; | |
720 | return fuse_get_dentry(sb, &handle); | |
721 | } | |
722 | ||
723 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
724 | struct fid *fid, int fh_len, int fh_type) | |
725 | { | |
726 | struct fuse_inode_handle parent; | |
727 | ||
728 | if (fh_type != 0x82 || fh_len < 6) | |
729 | return NULL; | |
730 | ||
731 | parent.nodeid = (u64) fid->raw[3] << 32; | |
732 | parent.nodeid |= (u64) fid->raw[4]; | |
733 | parent.generation = fid->raw[5]; | |
734 | return fuse_get_dentry(sb, &parent); | |
735 | } | |
736 | ||
33670fa2 MS |
737 | static struct dentry *fuse_get_parent(struct dentry *child) |
738 | { | |
739 | struct inode *child_inode = child->d_inode; | |
740 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
741 | struct inode *inode; | |
742 | struct dentry *parent; | |
743 | struct fuse_entry_out outarg; | |
744 | struct qstr name; | |
745 | int err; | |
746 | ||
747 | if (!fc->export_support) | |
748 | return ERR_PTR(-ESTALE); | |
749 | ||
750 | name.len = 2; | |
751 | name.name = ".."; | |
752 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
753 | &name, &outarg, &inode); | |
44003728 CH |
754 | if (err) { |
755 | if (err == -ENOENT) | |
756 | return ERR_PTR(-ESTALE); | |
33670fa2 | 757 | return ERR_PTR(err); |
33670fa2 | 758 | } |
44003728 CH |
759 | |
760 | parent = d_obtain_alias(inode); | |
c35eebe9 | 761 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 762 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
763 | |
764 | return parent; | |
765 | } | |
dbd561d2 MS |
766 | |
767 | static const struct export_operations fuse_export_operations = { | |
768 | .fh_to_dentry = fuse_fh_to_dentry, | |
769 | .fh_to_parent = fuse_fh_to_parent, | |
770 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 771 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
772 | }; |
773 | ||
ee9b6d61 | 774 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
775 | .alloc_inode = fuse_alloc_inode, |
776 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 777 | .evict_inode = fuse_evict_inode, |
ead5f0b5 | 778 | .drop_inode = generic_delete_inode, |
71421259 | 779 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 780 | .put_super = fuse_put_super, |
69a53bf2 | 781 | .umount_begin = fuse_umount_begin, |
e5e5558e | 782 | .statfs = fuse_statfs, |
d8a5ba45 MS |
783 | .show_options = fuse_show_options, |
784 | }; | |
785 | ||
487ea5af CH |
786 | static void sanitize_global_limit(unsigned *limit) |
787 | { | |
788 | if (*limit == 0) | |
0ed5fd13 | 789 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
790 | sizeof(struct fuse_req); |
791 | ||
792 | if (*limit >= 1 << 16) | |
793 | *limit = (1 << 16) - 1; | |
794 | } | |
795 | ||
796 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
797 | { | |
798 | int rv; | |
799 | ||
800 | rv = param_set_uint(val, kp); | |
801 | if (rv) | |
802 | return rv; | |
803 | ||
804 | sanitize_global_limit((unsigned *)kp->arg); | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
810 | { | |
811 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
812 | ||
813 | if (arg->minor < 13) | |
814 | return; | |
815 | ||
816 | sanitize_global_limit(&max_user_bgreq); | |
817 | sanitize_global_limit(&max_user_congthresh); | |
818 | ||
819 | if (arg->max_background) { | |
820 | fc->max_background = arg->max_background; | |
821 | ||
822 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
823 | fc->max_background = max_user_bgreq; | |
824 | } | |
825 | if (arg->congestion_threshold) { | |
826 | fc->congestion_threshold = arg->congestion_threshold; | |
827 | ||
828 | if (!cap_sys_admin && | |
829 | fc->congestion_threshold > max_user_congthresh) | |
830 | fc->congestion_threshold = max_user_congthresh; | |
831 | } | |
832 | } | |
833 | ||
9b9a0469 MS |
834 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
835 | { | |
9b9a0469 MS |
836 | struct fuse_init_out *arg = &req->misc.init_out; |
837 | ||
838 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
839 | fc->conn_error = 1; | |
840 | else { | |
9cd68455 MS |
841 | unsigned long ra_pages; |
842 | ||
487ea5af CH |
843 | process_init_limits(fc, arg); |
844 | ||
9cd68455 MS |
845 | if (arg->minor >= 6) { |
846 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
847 | if (arg->flags & FUSE_ASYNC_READ) | |
848 | fc->async_read = 1; | |
71421259 MS |
849 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
850 | fc->no_lock = 1; | |
37fb3a30 MS |
851 | if (arg->minor >= 17) { |
852 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
853 | fc->no_flock = 1; | |
24114504 MS |
854 | } else { |
855 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
856 | fc->no_flock = 1; | |
37fb3a30 | 857 | } |
6ff958ed MS |
858 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
859 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
860 | if (arg->minor >= 9) { |
861 | /* LOOKUP has dependency on proto version */ | |
862 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
863 | fc->export_support = 1; | |
864 | } | |
78bb6cb9 MS |
865 | if (arg->flags & FUSE_BIG_WRITES) |
866 | fc->big_writes = 1; | |
e0a43ddc MS |
867 | if (arg->flags & FUSE_DONT_MASK) |
868 | fc->dont_mask = 1; | |
72d0d248 BF |
869 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
870 | fc->auto_inval_data = 1; | |
28420dad | 871 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 872 | fc->do_readdirplus = 1; |
28420dad MS |
873 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
874 | fc->readdirplus_auto = 1; | |
875 | } | |
60b9df7a MS |
876 | if (arg->flags & FUSE_ASYNC_DIO) |
877 | fc->async_dio = 1; | |
71421259 | 878 | } else { |
9cd68455 | 879 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 | 880 | fc->no_lock = 1; |
37fb3a30 | 881 | fc->no_flock = 1; |
71421259 | 882 | } |
9cd68455 MS |
883 | |
884 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
885 | fc->minor = arg->minor; |
886 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 887 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 888 | fc->conn_init = 1; |
9b9a0469 | 889 | } |
796523fb | 890 | fc->initialized = 1; |
08a53cdc | 891 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
892 | } |
893 | ||
ce1d5a49 | 894 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 895 | { |
9b9a0469 | 896 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 897 | |
9b9a0469 MS |
898 | arg->major = FUSE_KERNEL_VERSION; |
899 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 900 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 901 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 902 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 903 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
0b05b183 | 904 | FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
60b9df7a | 905 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO; |
9b9a0469 MS |
906 | req->in.h.opcode = FUSE_INIT; |
907 | req->in.numargs = 1; | |
908 | req->in.args[0].size = sizeof(*arg); | |
909 | req->in.args[0].value = arg; | |
910 | req->out.numargs = 1; | |
3ad2f3fb | 911 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
912 | with interface version < 7.5. Rest of init_out is zeroed |
913 | by do_get_request(), so a short reply is not a problem */ | |
914 | req->out.argvar = 1; | |
915 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
916 | req->out.args[0].value = &req->misc.init_out; | |
917 | req->end = process_init_reply; | |
b93f858a | 918 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
919 | } |
920 | ||
43901aab TH |
921 | static void fuse_free_conn(struct fuse_conn *fc) |
922 | { | |
923 | kfree(fc); | |
924 | } | |
925 | ||
a325f9b9 TH |
926 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
927 | { | |
928 | int err; | |
929 | ||
d993831f | 930 | fc->bdi.name = "fuse"; |
a325f9b9 | 931 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
a325f9b9 | 932 | /* fuse does it's own writeback accounting */ |
5a537485 | 933 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; |
a325f9b9 TH |
934 | |
935 | err = bdi_init(&fc->bdi); | |
936 | if (err) | |
937 | return err; | |
938 | ||
939 | fc->bdi_initialized = 1; | |
940 | ||
941 | if (sb->s_bdev) { | |
942 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
943 | MAJOR(fc->dev), MINOR(fc->dev)); | |
944 | } else { | |
945 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
946 | } | |
947 | ||
948 | if (err) | |
949 | return err; | |
950 | ||
951 | /* | |
952 | * For a single fuse filesystem use max 1% of dirty + | |
953 | * writeback threshold. | |
954 | * | |
955 | * This gives about 1M of write buffer for memory maps on a | |
956 | * machine with 1G and 10% dirty_ratio, which should be more | |
957 | * than enough. | |
958 | * | |
959 | * Privileged users can raise it by writing to | |
960 | * | |
961 | * /sys/class/bdi/<bdi>/max_ratio | |
962 | */ | |
963 | bdi_set_max_ratio(&fc->bdi, 1); | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
d8a5ba45 MS |
968 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
969 | { | |
970 | struct fuse_conn *fc; | |
971 | struct inode *root; | |
972 | struct fuse_mount_data d; | |
973 | struct file *file; | |
f543f253 | 974 | struct dentry *root_dentry; |
ce1d5a49 | 975 | struct fuse_req *init_req; |
d8a5ba45 | 976 | int err; |
d8091614 | 977 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 978 | |
c2b8f006 | 979 | err = -EINVAL; |
71421259 | 980 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 981 | goto err; |
71421259 | 982 | |
9e1f1de0 AV |
983 | sb->s_flags &= ~MS_NOSEC; |
984 | ||
d8091614 | 985 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 986 | goto err; |
d8a5ba45 | 987 | |
d8091614 | 988 | if (is_bdev) { |
875d95ec | 989 | #ifdef CONFIG_BLOCK |
c2b8f006 | 990 | err = -EINVAL; |
d8091614 | 991 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 992 | goto err; |
875d95ec | 993 | #endif |
d8091614 MS |
994 | } else { |
995 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
996 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
997 | } | |
d8a5ba45 MS |
998 | sb->s_magic = FUSE_SUPER_MAGIC; |
999 | sb->s_op = &fuse_super_operations; | |
1000 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
0a2da9b2 | 1001 | sb->s_time_gran = 1; |
dbd561d2 | 1002 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1003 | |
1004 | file = fget(d.fd); | |
c2b8f006 | 1005 | err = -EINVAL; |
d8a5ba45 | 1006 | if (!file) |
c2b8f006 | 1007 | goto err; |
d8a5ba45 | 1008 | |
499dcf20 EB |
1009 | if ((file->f_op != &fuse_dev_operations) || |
1010 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1011 | goto err_fput; |
0720b315 | 1012 | |
0d179aa5 | 1013 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1014 | err = -ENOMEM; |
1015 | if (!fc) | |
1016 | goto err_fput; | |
d8a5ba45 | 1017 | |
a325f9b9 TH |
1018 | fuse_conn_init(fc); |
1019 | ||
1020 | fc->dev = sb->s_dev; | |
3b463ae0 | 1021 | fc->sb = sb; |
a325f9b9 TH |
1022 | err = fuse_bdi_init(fc, sb); |
1023 | if (err) | |
1024 | goto err_put_conn; | |
0d179aa5 | 1025 | |
32a88aa1 JA |
1026 | sb->s_bdi = &fc->bdi; |
1027 | ||
e0a43ddc MS |
1028 | /* Handle umasking inside the fuse code */ |
1029 | if (sb->s_flags & MS_POSIXACL) | |
1030 | fc->dont_mask = 1; | |
1031 | sb->s_flags |= MS_POSIXACL; | |
1032 | ||
43901aab | 1033 | fc->release = fuse_free_conn; |
1e9a4ed9 | 1034 | fc->flags = d.flags; |
d8a5ba45 | 1035 | fc->user_id = d.user_id; |
87729a55 | 1036 | fc->group_id = d.group_id; |
f948d564 | 1037 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1038 | |
f543f253 MS |
1039 | /* Used by get_root_inode() */ |
1040 | sb->s_fs_info = fc; | |
1041 | ||
d8a5ba45 | 1042 | err = -ENOMEM; |
b93f858a | 1043 | root = fuse_get_root_inode(sb, d.rootmode); |
48fde701 AV |
1044 | root_dentry = d_make_root(root); |
1045 | if (!root_dentry) | |
c2b8f006 | 1046 | goto err_put_conn; |
c35eebe9 AV |
1047 | /* only now - we want root dentry with NULL ->d_op */ |
1048 | sb->s_d_op = &fuse_dentry_operations; | |
f543f253 | 1049 | |
4250c066 | 1050 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1051 | if (!init_req) |
1052 | goto err_put_root; | |
8b41e671 | 1053 | init_req->background = 1; |
ce1d5a49 | 1054 | |
0ec7ca41 | 1055 | if (is_bdev) { |
4250c066 | 1056 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1057 | if (!fc->destroy_req) |
17e18ab6 | 1058 | goto err_free_init_req; |
0ec7ca41 MS |
1059 | } |
1060 | ||
bafa9654 | 1061 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1062 | err = -EINVAL; |
1063 | if (file->private_data) | |
bafa9654 | 1064 | goto err_unlock; |
8aa09a50 | 1065 | |
bafa9654 MS |
1066 | err = fuse_ctl_add_conn(fc); |
1067 | if (err) | |
1068 | goto err_unlock; | |
1069 | ||
1070 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1071 | sb->s_root = root_dentry; |
f543f253 | 1072 | fc->connected = 1; |
bafa9654 MS |
1073 | file->private_data = fuse_conn_get(fc); |
1074 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
1075 | /* |
1076 | * atomic_dec_and_test() in fput() provides the necessary | |
1077 | * memory barrier for file->private_data to be visible on all | |
1078 | * CPUs after this | |
1079 | */ | |
1080 | fput(file); | |
f543f253 | 1081 | |
ce1d5a49 | 1082 | fuse_send_init(fc, init_req); |
f543f253 | 1083 | |
d8a5ba45 MS |
1084 | return 0; |
1085 | ||
bafa9654 MS |
1086 | err_unlock: |
1087 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1088 | err_free_init_req: |
ce1d5a49 | 1089 | fuse_request_free(init_req); |
f543f253 MS |
1090 | err_put_root: |
1091 | dput(root_dentry); | |
c2b8f006 | 1092 | err_put_conn: |
a325f9b9 | 1093 | fuse_bdi_destroy(fc); |
bafa9654 | 1094 | fuse_conn_put(fc); |
c2b8f006 MS |
1095 | err_fput: |
1096 | fput(file); | |
1097 | err: | |
d8a5ba45 MS |
1098 | return err; |
1099 | } | |
1100 | ||
3c26ff6e | 1101 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1102 | int flags, const char *dev_name, |
3c26ff6e | 1103 | void *raw_data) |
d8a5ba45 | 1104 | { |
3c26ff6e | 1105 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1106 | } |
1107 | ||
3b463ae0 JM |
1108 | static void fuse_kill_sb_anon(struct super_block *sb) |
1109 | { | |
1110 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1111 | ||
1112 | if (fc) { | |
1113 | down_write(&fc->killsb); | |
1114 | fc->sb = NULL; | |
1115 | up_write(&fc->killsb); | |
1116 | } | |
1117 | ||
1118 | kill_anon_super(sb); | |
1119 | } | |
1120 | ||
875d95ec MS |
1121 | static struct file_system_type fuse_fs_type = { |
1122 | .owner = THIS_MODULE, | |
1123 | .name = "fuse", | |
79c0b2df | 1124 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1125 | .mount = fuse_mount, |
3b463ae0 | 1126 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1127 | }; |
7f78e035 | 1128 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1129 | |
1130 | #ifdef CONFIG_BLOCK | |
152a0836 | 1131 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1132 | int flags, const char *dev_name, |
152a0836 | 1133 | void *raw_data) |
d6392f87 | 1134 | { |
152a0836 | 1135 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1136 | } |
1137 | ||
3b463ae0 JM |
1138 | static void fuse_kill_sb_blk(struct super_block *sb) |
1139 | { | |
1140 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1141 | ||
1142 | if (fc) { | |
1143 | down_write(&fc->killsb); | |
1144 | fc->sb = NULL; | |
1145 | up_write(&fc->killsb); | |
1146 | } | |
1147 | ||
1148 | kill_block_super(sb); | |
1149 | } | |
1150 | ||
d6392f87 MS |
1151 | static struct file_system_type fuseblk_fs_type = { |
1152 | .owner = THIS_MODULE, | |
1153 | .name = "fuseblk", | |
152a0836 | 1154 | .mount = fuse_mount_blk, |
3b463ae0 | 1155 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1156 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1157 | }; |
7f78e035 | 1158 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1159 | |
875d95ec MS |
1160 | static inline int register_fuseblk(void) |
1161 | { | |
1162 | return register_filesystem(&fuseblk_fs_type); | |
1163 | } | |
1164 | ||
1165 | static inline void unregister_fuseblk(void) | |
1166 | { | |
1167 | unregister_filesystem(&fuseblk_fs_type); | |
1168 | } | |
1169 | #else | |
1170 | static inline int register_fuseblk(void) | |
1171 | { | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | static inline void unregister_fuseblk(void) | |
1176 | { | |
1177 | } | |
1178 | #endif | |
1179 | ||
51cc5068 | 1180 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1181 | { |
1729a16c | 1182 | struct inode *inode = foo; |
d8a5ba45 | 1183 | |
a35afb83 | 1184 | inode_init_once(inode); |
d8a5ba45 MS |
1185 | } |
1186 | ||
1187 | static int __init fuse_fs_init(void) | |
1188 | { | |
1189 | int err; | |
1190 | ||
d6392f87 MS |
1191 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
1192 | sizeof(struct fuse_inode), | |
1193 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1194 | fuse_inode_init_once); |
d6392f87 MS |
1195 | err = -ENOMEM; |
1196 | if (!fuse_inode_cachep) | |
988f0325 AV |
1197 | goto out; |
1198 | ||
1199 | err = register_fuseblk(); | |
1200 | if (err) | |
1201 | goto out2; | |
1202 | ||
1203 | err = register_filesystem(&fuse_fs_type); | |
1204 | if (err) | |
1205 | goto out3; | |
d6392f87 MS |
1206 | |
1207 | return 0; | |
d8a5ba45 | 1208 | |
988f0325 | 1209 | out3: |
875d95ec | 1210 | unregister_fuseblk(); |
988f0325 AV |
1211 | out2: |
1212 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1213 | out: |
d8a5ba45 MS |
1214 | return err; |
1215 | } | |
1216 | ||
1217 | static void fuse_fs_cleanup(void) | |
1218 | { | |
1219 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1220 | unregister_fuseblk(); |
8c0a8537 KS |
1221 | |
1222 | /* | |
1223 | * Make sure all delayed rcu free inodes are flushed before we | |
1224 | * destroy cache. | |
1225 | */ | |
1226 | rcu_barrier(); | |
d8a5ba45 MS |
1227 | kmem_cache_destroy(fuse_inode_cachep); |
1228 | } | |
1229 | ||
5c89e17e GKH |
1230 | static struct kobject *fuse_kobj; |
1231 | static struct kobject *connections_kobj; | |
1232 | ||
f543f253 MS |
1233 | static int fuse_sysfs_init(void) |
1234 | { | |
1235 | int err; | |
1236 | ||
00d26666 | 1237 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1238 | if (!fuse_kobj) { |
1239 | err = -ENOMEM; | |
f543f253 | 1240 | goto out_err; |
5c89e17e | 1241 | } |
f543f253 | 1242 | |
5c89e17e GKH |
1243 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1244 | if (!connections_kobj) { | |
1245 | err = -ENOMEM; | |
f543f253 | 1246 | goto out_fuse_unregister; |
5c89e17e | 1247 | } |
f543f253 MS |
1248 | |
1249 | return 0; | |
1250 | ||
1251 | out_fuse_unregister: | |
197b12d6 | 1252 | kobject_put(fuse_kobj); |
f543f253 MS |
1253 | out_err: |
1254 | return err; | |
1255 | } | |
1256 | ||
1257 | static void fuse_sysfs_cleanup(void) | |
1258 | { | |
197b12d6 GKH |
1259 | kobject_put(connections_kobj); |
1260 | kobject_put(fuse_kobj); | |
f543f253 MS |
1261 | } |
1262 | ||
d8a5ba45 MS |
1263 | static int __init fuse_init(void) |
1264 | { | |
1265 | int res; | |
1266 | ||
1729a16c | 1267 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1268 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1269 | ||
bafa9654 | 1270 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1271 | res = fuse_fs_init(); |
1272 | if (res) | |
1273 | goto err; | |
1274 | ||
334f485d MS |
1275 | res = fuse_dev_init(); |
1276 | if (res) | |
1277 | goto err_fs_cleanup; | |
1278 | ||
f543f253 MS |
1279 | res = fuse_sysfs_init(); |
1280 | if (res) | |
1281 | goto err_dev_cleanup; | |
1282 | ||
bafa9654 MS |
1283 | res = fuse_ctl_init(); |
1284 | if (res) | |
1285 | goto err_sysfs_cleanup; | |
1286 | ||
487ea5af CH |
1287 | sanitize_global_limit(&max_user_bgreq); |
1288 | sanitize_global_limit(&max_user_congthresh); | |
1289 | ||
d8a5ba45 MS |
1290 | return 0; |
1291 | ||
bafa9654 MS |
1292 | err_sysfs_cleanup: |
1293 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1294 | err_dev_cleanup: |
1295 | fuse_dev_cleanup(); | |
334f485d MS |
1296 | err_fs_cleanup: |
1297 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1298 | err: |
1299 | return res; | |
1300 | } | |
1301 | ||
1302 | static void __exit fuse_exit(void) | |
1303 | { | |
1304 | printk(KERN_DEBUG "fuse exit\n"); | |
1305 | ||
bafa9654 | 1306 | fuse_ctl_cleanup(); |
f543f253 | 1307 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1308 | fuse_fs_cleanup(); |
334f485d | 1309 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1310 | } |
1311 | ||
1312 | module_init(fuse_init); | |
1313 | module_exit(fuse_exit); |