]>
Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
487ea5af | 17 | #include <linux/moduleparam.h> |
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; |
93a8c3cd | 95 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
96 | INIT_LIST_HEAD(&fi->queued_writes); |
97 | INIT_LIST_HEAD(&fi->writepages); | |
98 | init_waitqueue_head(&fi->page_waitq); | |
07e77dca MS |
99 | fi->forget = fuse_alloc_forget(); |
100 | if (!fi->forget) { | |
e5e5558e MS |
101 | kmem_cache_free(fuse_inode_cachep, inode); |
102 | return NULL; | |
103 | } | |
d8a5ba45 MS |
104 | |
105 | return inode; | |
106 | } | |
107 | ||
fa0d7e3d NP |
108 | static void fuse_i_callback(struct rcu_head *head) |
109 | { | |
110 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
111 | kmem_cache_free(fuse_inode_cachep, inode); |
112 | } | |
113 | ||
d8a5ba45 MS |
114 | static void fuse_destroy_inode(struct inode *inode) |
115 | { | |
e5e5558e | 116 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 117 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 118 | BUG_ON(!list_empty(&fi->queued_writes)); |
07e77dca | 119 | kfree(fi->forget); |
fa0d7e3d | 120 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
121 | } |
122 | ||
b57922d9 | 123 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 124 | { |
b57922d9 | 125 | truncate_inode_pages(&inode->i_data, 0); |
dbd5768f | 126 | clear_inode(inode); |
1e9a4ed9 MS |
127 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
128 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 129 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
130 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
131 | fi->forget = NULL; | |
e5e5558e | 132 | } |
d8a5ba45 MS |
133 | } |
134 | ||
71421259 MS |
135 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
136 | { | |
137 | if (*flags & MS_MANDLOCK) | |
138 | return -EINVAL; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
45c72cd7 PS |
143 | /* |
144 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
145 | * so that it will fit. | |
146 | */ | |
147 | static ino_t fuse_squash_ino(u64 ino64) | |
148 | { | |
149 | ino_t ino = (ino_t) ino64; | |
150 | if (sizeof(ino_t) < sizeof(u64)) | |
151 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
152 | return ino; | |
153 | } | |
154 | ||
3be5a52b MS |
155 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
156 | u64 attr_valid) | |
d8a5ba45 | 157 | { |
9ffbb916 | 158 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 159 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 160 | |
1fb69e78 MS |
161 | fi->attr_version = ++fc->attr_version; |
162 | fi->i_time = attr_valid; | |
163 | ||
45c72cd7 | 164 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 165 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 166 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
167 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
168 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
169 | inode->i_blocks = attr->blocks; |
170 | inode->i_atime.tv_sec = attr->atime; | |
171 | inode->i_atime.tv_nsec = attr->atimensec; | |
172 | inode->i_mtime.tv_sec = attr->mtime; | |
173 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
174 | inode->i_ctime.tv_sec = attr->ctime; | |
175 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 176 | |
0e9663ee MS |
177 | if (attr->blksize != 0) |
178 | inode->i_blkbits = ilog2(attr->blksize); | |
179 | else | |
180 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
181 | ||
ebc14c4d MS |
182 | /* |
183 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
184 | * to check permissions. This prevents failures due to the | |
185 | * check in may_delete(). | |
186 | */ | |
187 | fi->orig_i_mode = inode->i_mode; | |
188 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
189 | inode->i_mode &= ~S_ISVTX; | |
45c72cd7 PS |
190 | |
191 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
192 | } |
193 | ||
194 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
195 | u64 attr_valid, u64 attr_version) | |
196 | { | |
197 | struct fuse_conn *fc = get_fuse_conn(inode); | |
198 | struct fuse_inode *fi = get_fuse_inode(inode); | |
199 | loff_t oldsize; | |
eed2179e | 200 | struct timespec old_mtime; |
3be5a52b MS |
201 | |
202 | spin_lock(&fc->lock); | |
203 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
204 | spin_unlock(&fc->lock); | |
205 | return; | |
206 | } | |
207 | ||
eed2179e | 208 | old_mtime = inode->i_mtime; |
3be5a52b | 209 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 210 | |
e00d2c2d MS |
211 | oldsize = inode->i_size; |
212 | i_size_write(inode, attr->size); | |
213 | spin_unlock(&fc->lock); | |
214 | ||
eed2179e BF |
215 | if (S_ISREG(inode->i_mode)) { |
216 | bool inval = false; | |
217 | ||
218 | if (oldsize != attr->size) { | |
219 | truncate_pagecache(inode, oldsize, attr->size); | |
220 | inval = true; | |
221 | } else if (fc->auto_inval_data) { | |
222 | struct timespec new_mtime = { | |
223 | .tv_sec = attr->mtime, | |
224 | .tv_nsec = attr->mtimensec, | |
225 | }; | |
226 | ||
227 | /* | |
228 | * Auto inval mode also checks and invalidates if mtime | |
229 | * has changed. | |
230 | */ | |
231 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
232 | inval = true; | |
233 | } | |
234 | ||
235 | if (inval) | |
236 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 237 | } |
d8a5ba45 MS |
238 | } |
239 | ||
240 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
241 | { | |
242 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 243 | inode->i_size = attr->size; |
e5e5558e MS |
244 | if (S_ISREG(inode->i_mode)) { |
245 | fuse_init_common(inode); | |
b6aeaded | 246 | fuse_init_file_inode(inode); |
e5e5558e MS |
247 | } else if (S_ISDIR(inode->i_mode)) |
248 | fuse_init_dir(inode); | |
249 | else if (S_ISLNK(inode->i_mode)) | |
250 | fuse_init_symlink(inode); | |
251 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
252 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
253 | fuse_init_common(inode); | |
254 | init_special_inode(inode, inode->i_mode, | |
255 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
256 | } else |
257 | BUG(); | |
d8a5ba45 MS |
258 | } |
259 | ||
3b463ae0 | 260 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 261 | { |
b48badf0 | 262 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
263 | if (get_node_id(inode) == nodeid) |
264 | return 1; | |
265 | else | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
270 | { | |
b48badf0 | 271 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
272 | get_fuse_inode(inode)->nodeid = nodeid; |
273 | return 0; | |
274 | } | |
275 | ||
b48badf0 | 276 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
277 | int generation, struct fuse_attr *attr, |
278 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
279 | { |
280 | struct inode *inode; | |
9e6268db | 281 | struct fuse_inode *fi; |
d8a5ba45 | 282 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
283 | |
284 | retry: | |
285 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
286 | if (!inode) | |
287 | return NULL; | |
288 | ||
289 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 290 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
291 | inode->i_generation = generation; |
292 | inode->i_data.backing_dev_info = &fc->bdi; | |
293 | fuse_init_inode(inode, attr); | |
294 | unlock_new_inode(inode); | |
295 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
296 | /* Inode has changed type, any I/O on the old should fail */ |
297 | make_bad_inode(inode); | |
298 | iput(inode); | |
d8a5ba45 MS |
299 | goto retry; |
300 | } | |
301 | ||
9e6268db | 302 | fi = get_fuse_inode(inode); |
8da5ff23 | 303 | spin_lock(&fc->lock); |
1729a16c | 304 | fi->nlookup++; |
8da5ff23 | 305 | spin_unlock(&fc->lock); |
1fb69e78 MS |
306 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
307 | ||
d8a5ba45 MS |
308 | return inode; |
309 | } | |
310 | ||
3b463ae0 JM |
311 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
312 | loff_t offset, loff_t len) | |
313 | { | |
314 | struct inode *inode; | |
315 | pgoff_t pg_start; | |
316 | pgoff_t pg_end; | |
317 | ||
318 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
319 | if (!inode) | |
320 | return -ENOENT; | |
321 | ||
322 | fuse_invalidate_attr(inode); | |
323 | if (offset >= 0) { | |
324 | pg_start = offset >> PAGE_CACHE_SHIFT; | |
325 | if (len <= 0) | |
326 | pg_end = -1; | |
327 | else | |
328 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
329 | invalidate_inode_pages2_range(inode->i_mapping, | |
330 | pg_start, pg_end); | |
331 | } | |
332 | iput(inode); | |
333 | return 0; | |
334 | } | |
335 | ||
42faad99 | 336 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 337 | { |
42faad99 | 338 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
339 | } |
340 | ||
0ec7ca41 MS |
341 | static void fuse_send_destroy(struct fuse_conn *fc) |
342 | { | |
343 | struct fuse_req *req = fc->destroy_req; | |
344 | if (req && fc->conn_init) { | |
345 | fc->destroy_req = NULL; | |
346 | req->in.h.opcode = FUSE_DESTROY; | |
347 | req->force = 1; | |
b93f858a | 348 | fuse_request_send(fc, req); |
0ec7ca41 MS |
349 | fuse_put_request(fc, req); |
350 | } | |
351 | } | |
352 | ||
a325f9b9 | 353 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 354 | { |
a325f9b9 TH |
355 | if (fc->bdi_initialized) |
356 | bdi_destroy(&fc->bdi); | |
357 | } | |
d8a5ba45 | 358 | |
08cbf542 | 359 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 360 | { |
d7133114 | 361 | spin_lock(&fc->lock); |
9ba7cbba | 362 | fc->connected = 0; |
51eb01e7 | 363 | fc->blocked = 0; |
d7133114 | 364 | spin_unlock(&fc->lock); |
334f485d | 365 | /* Flush all readers on this fs */ |
385a17bf | 366 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 367 | wake_up_all(&fc->waitq); |
51eb01e7 | 368 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 369 | wake_up_all(&fc->reserved_req_waitq); |
a325f9b9 | 370 | } |
08cbf542 | 371 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
372 | |
373 | static void fuse_put_super(struct super_block *sb) | |
374 | { | |
375 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
376 | ||
377 | fuse_send_destroy(fc); | |
bbd99797 | 378 | |
a325f9b9 | 379 | fuse_conn_kill(fc); |
bbd99797 MS |
380 | mutex_lock(&fuse_mutex); |
381 | list_del(&fc->entry); | |
382 | fuse_ctl_remove_conn(fc); | |
383 | mutex_unlock(&fuse_mutex); | |
384 | fuse_bdi_destroy(fc); | |
385 | ||
bafa9654 | 386 | fuse_conn_put(fc); |
d8a5ba45 MS |
387 | } |
388 | ||
e5e5558e MS |
389 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
390 | { | |
391 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
392 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 393 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
394 | stbuf->f_blocks = attr->blocks; |
395 | stbuf->f_bfree = attr->bfree; | |
396 | stbuf->f_bavail = attr->bavail; | |
397 | stbuf->f_files = attr->files; | |
398 | stbuf->f_ffree = attr->ffree; | |
399 | stbuf->f_namelen = attr->namelen; | |
400 | /* fsid is left zero */ | |
401 | } | |
402 | ||
726c3342 | 403 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 404 | { |
726c3342 | 405 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
406 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
407 | struct fuse_req *req; | |
408 | struct fuse_statfs_out outarg; | |
409 | int err; | |
410 | ||
c2132c1b | 411 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
412 | buf->f_type = FUSE_SUPER_MAGIC; |
413 | return 0; | |
414 | } | |
415 | ||
b111c8c0 | 416 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
417 | if (IS_ERR(req)) |
418 | return PTR_ERR(req); | |
e5e5558e | 419 | |
de5f1202 | 420 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
421 | req->in.numargs = 0; |
422 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 423 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 424 | req->out.numargs = 1; |
de5f1202 MS |
425 | req->out.args[0].size = |
426 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 427 | req->out.args[0].value = &outarg; |
b93f858a | 428 | fuse_request_send(fc, req); |
e5e5558e MS |
429 | err = req->out.h.error; |
430 | if (!err) | |
431 | convert_fuse_statfs(buf, &outarg.st); | |
432 | fuse_put_request(fc, req); | |
433 | return err; | |
434 | } | |
435 | ||
d8a5ba45 MS |
436 | enum { |
437 | OPT_FD, | |
438 | OPT_ROOTMODE, | |
439 | OPT_USER_ID, | |
87729a55 | 440 | OPT_GROUP_ID, |
d8a5ba45 MS |
441 | OPT_DEFAULT_PERMISSIONS, |
442 | OPT_ALLOW_OTHER, | |
db50b96c | 443 | OPT_MAX_READ, |
d8091614 | 444 | OPT_BLKSIZE, |
d8a5ba45 MS |
445 | OPT_ERR |
446 | }; | |
447 | ||
a447c093 | 448 | static const match_table_t tokens = { |
d8a5ba45 MS |
449 | {OPT_FD, "fd=%u"}, |
450 | {OPT_ROOTMODE, "rootmode=%o"}, | |
451 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 452 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
453 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
454 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 455 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 456 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
457 | {OPT_ERR, NULL} |
458 | }; | |
459 | ||
d8091614 | 460 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
461 | { |
462 | char *p; | |
463 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 464 | d->max_read = ~0; |
d1875dba | 465 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
466 | |
467 | while ((p = strsep(&opt, ",")) != NULL) { | |
468 | int token; | |
469 | int value; | |
470 | substring_t args[MAX_OPT_ARGS]; | |
471 | if (!*p) | |
472 | continue; | |
473 | ||
474 | token = match_token(p, tokens, args); | |
475 | switch (token) { | |
476 | case OPT_FD: | |
477 | if (match_int(&args[0], &value)) | |
478 | return 0; | |
479 | d->fd = value; | |
5a533682 | 480 | d->fd_present = 1; |
d8a5ba45 MS |
481 | break; |
482 | ||
483 | case OPT_ROOTMODE: | |
484 | if (match_octal(&args[0], &value)) | |
485 | return 0; | |
a5bfffac TS |
486 | if (!fuse_valid_type(value)) |
487 | return 0; | |
d8a5ba45 | 488 | d->rootmode = value; |
5a533682 | 489 | d->rootmode_present = 1; |
d8a5ba45 MS |
490 | break; |
491 | ||
492 | case OPT_USER_ID: | |
493 | if (match_int(&args[0], &value)) | |
494 | return 0; | |
499dcf20 EB |
495 | d->user_id = make_kuid(current_user_ns(), value); |
496 | if (!uid_valid(d->user_id)) | |
497 | return 0; | |
5a533682 | 498 | d->user_id_present = 1; |
d8a5ba45 MS |
499 | break; |
500 | ||
87729a55 MS |
501 | case OPT_GROUP_ID: |
502 | if (match_int(&args[0], &value)) | |
503 | return 0; | |
499dcf20 EB |
504 | d->group_id = make_kgid(current_user_ns(), value); |
505 | if (!gid_valid(d->group_id)) | |
506 | return 0; | |
5a533682 | 507 | d->group_id_present = 1; |
87729a55 MS |
508 | break; |
509 | ||
1e9a4ed9 MS |
510 | case OPT_DEFAULT_PERMISSIONS: |
511 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
512 | break; | |
513 | ||
514 | case OPT_ALLOW_OTHER: | |
515 | d->flags |= FUSE_ALLOW_OTHER; | |
516 | break; | |
517 | ||
db50b96c MS |
518 | case OPT_MAX_READ: |
519 | if (match_int(&args[0], &value)) | |
520 | return 0; | |
521 | d->max_read = value; | |
522 | break; | |
523 | ||
d8091614 MS |
524 | case OPT_BLKSIZE: |
525 | if (!is_bdev || match_int(&args[0], &value)) | |
526 | return 0; | |
527 | d->blksize = value; | |
528 | break; | |
529 | ||
d8a5ba45 MS |
530 | default: |
531 | return 0; | |
532 | } | |
533 | } | |
5a533682 MS |
534 | |
535 | if (!d->fd_present || !d->rootmode_present || | |
536 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
537 | return 0; |
538 | ||
539 | return 1; | |
540 | } | |
541 | ||
34c80b1d | 542 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 543 | { |
34c80b1d AV |
544 | struct super_block *sb = root->d_sb; |
545 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 546 | |
499dcf20 EB |
547 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
548 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
1e9a4ed9 MS |
549 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
550 | seq_puts(m, ",default_permissions"); | |
551 | if (fc->flags & FUSE_ALLOW_OTHER) | |
552 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
553 | if (fc->max_read != ~0) |
554 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
555 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
556 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
557 | return 0; |
558 | } | |
559 | ||
a325f9b9 | 560 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 561 | { |
0d179aa5 TH |
562 | memset(fc, 0, sizeof(*fc)); |
563 | spin_lock_init(&fc->lock); | |
564 | mutex_init(&fc->inst_mutex); | |
3b463ae0 | 565 | init_rwsem(&fc->killsb); |
0d179aa5 TH |
566 | atomic_set(&fc->count, 1); |
567 | init_waitqueue_head(&fc->waitq); | |
568 | init_waitqueue_head(&fc->blocked_waitq); | |
569 | init_waitqueue_head(&fc->reserved_req_waitq); | |
570 | INIT_LIST_HEAD(&fc->pending); | |
571 | INIT_LIST_HEAD(&fc->processing); | |
572 | INIT_LIST_HEAD(&fc->io); | |
573 | INIT_LIST_HEAD(&fc->interrupts); | |
574 | INIT_LIST_HEAD(&fc->bg_queue); | |
575 | INIT_LIST_HEAD(&fc->entry); | |
07e77dca | 576 | fc->forget_list_tail = &fc->forget_list_head; |
0d179aa5 | 577 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
578 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
579 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
580 | fc->khctr = 0; |
581 | fc->polled_files = RB_ROOT; | |
0d179aa5 TH |
582 | fc->reqctr = 0; |
583 | fc->blocked = 1; | |
584 | fc->attr_version = 1; | |
585 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 586 | } |
0d179aa5 | 587 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 588 | |
bafa9654 MS |
589 | void fuse_conn_put(struct fuse_conn *fc) |
590 | { | |
d2a85164 | 591 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
592 | if (fc->destroy_req) |
593 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 594 | mutex_destroy(&fc->inst_mutex); |
43901aab | 595 | fc->release(fc); |
d2a85164 | 596 | } |
bafa9654 | 597 | } |
08cbf542 | 598 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
599 | |
600 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
601 | { | |
602 | atomic_inc(&fc->count); | |
603 | return fc; | |
604 | } | |
08cbf542 | 605 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 606 | |
b93f858a | 607 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
608 | { |
609 | struct fuse_attr attr; | |
610 | memset(&attr, 0, sizeof(attr)); | |
611 | ||
612 | attr.mode = mode; | |
613 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 614 | attr.nlink = 1; |
1fb69e78 | 615 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
616 | } |
617 | ||
1729a16c | 618 | struct fuse_inode_handle { |
dbd561d2 MS |
619 | u64 nodeid; |
620 | u32 generation; | |
621 | }; | |
622 | ||
623 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
624 | struct fuse_inode_handle *handle) | |
625 | { | |
33670fa2 | 626 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
627 | struct inode *inode; |
628 | struct dentry *entry; | |
629 | int err = -ESTALE; | |
630 | ||
631 | if (handle->nodeid == 0) | |
632 | goto out_err; | |
633 | ||
634 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
635 | if (!inode) { |
636 | struct fuse_entry_out outarg; | |
637 | struct qstr name; | |
638 | ||
639 | if (!fc->export_support) | |
640 | goto out_err; | |
641 | ||
642 | name.len = 1; | |
643 | name.name = "."; | |
644 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
645 | &inode); | |
646 | if (err && err != -ENOENT) | |
647 | goto out_err; | |
648 | if (err || !inode) { | |
649 | err = -ESTALE; | |
650 | goto out_err; | |
651 | } | |
652 | err = -EIO; | |
653 | if (get_node_id(inode) != handle->nodeid) | |
654 | goto out_iput; | |
655 | } | |
dbd561d2 MS |
656 | err = -ESTALE; |
657 | if (inode->i_generation != handle->generation) | |
658 | goto out_iput; | |
659 | ||
44003728 | 660 | entry = d_obtain_alias(inode); |
c35eebe9 | 661 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 662 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
663 | |
664 | return entry; | |
665 | ||
666 | out_iput: | |
667 | iput(inode); | |
668 | out_err: | |
669 | return ERR_PTR(err); | |
670 | } | |
671 | ||
b0b0382b AV |
672 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
673 | struct inode *parent) | |
dbd561d2 | 674 | { |
b0b0382b | 675 | int len = parent ? 6 : 3; |
dbd561d2 MS |
676 | u64 nodeid; |
677 | u32 generation; | |
678 | ||
5fe0c237 AK |
679 | if (*max_len < len) { |
680 | *max_len = len; | |
dbd561d2 | 681 | return 255; |
5fe0c237 | 682 | } |
dbd561d2 MS |
683 | |
684 | nodeid = get_fuse_inode(inode)->nodeid; | |
685 | generation = inode->i_generation; | |
686 | ||
687 | fh[0] = (u32)(nodeid >> 32); | |
688 | fh[1] = (u32)(nodeid & 0xffffffff); | |
689 | fh[2] = generation; | |
690 | ||
b0b0382b | 691 | if (parent) { |
dbd561d2 MS |
692 | nodeid = get_fuse_inode(parent)->nodeid; |
693 | generation = parent->i_generation; | |
dbd561d2 MS |
694 | |
695 | fh[3] = (u32)(nodeid >> 32); | |
696 | fh[4] = (u32)(nodeid & 0xffffffff); | |
697 | fh[5] = generation; | |
698 | } | |
699 | ||
700 | *max_len = len; | |
b0b0382b | 701 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
702 | } |
703 | ||
704 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
705 | struct fid *fid, int fh_len, int fh_type) | |
706 | { | |
707 | struct fuse_inode_handle handle; | |
708 | ||
709 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
710 | return NULL; | |
711 | ||
712 | handle.nodeid = (u64) fid->raw[0] << 32; | |
713 | handle.nodeid |= (u64) fid->raw[1]; | |
714 | handle.generation = fid->raw[2]; | |
715 | return fuse_get_dentry(sb, &handle); | |
716 | } | |
717 | ||
718 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
719 | struct fid *fid, int fh_len, int fh_type) | |
720 | { | |
721 | struct fuse_inode_handle parent; | |
722 | ||
723 | if (fh_type != 0x82 || fh_len < 6) | |
724 | return NULL; | |
725 | ||
726 | parent.nodeid = (u64) fid->raw[3] << 32; | |
727 | parent.nodeid |= (u64) fid->raw[4]; | |
728 | parent.generation = fid->raw[5]; | |
729 | return fuse_get_dentry(sb, &parent); | |
730 | } | |
731 | ||
33670fa2 MS |
732 | static struct dentry *fuse_get_parent(struct dentry *child) |
733 | { | |
734 | struct inode *child_inode = child->d_inode; | |
735 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
736 | struct inode *inode; | |
737 | struct dentry *parent; | |
738 | struct fuse_entry_out outarg; | |
739 | struct qstr name; | |
740 | int err; | |
741 | ||
742 | if (!fc->export_support) | |
743 | return ERR_PTR(-ESTALE); | |
744 | ||
745 | name.len = 2; | |
746 | name.name = ".."; | |
747 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
748 | &name, &outarg, &inode); | |
44003728 CH |
749 | if (err) { |
750 | if (err == -ENOENT) | |
751 | return ERR_PTR(-ESTALE); | |
33670fa2 | 752 | return ERR_PTR(err); |
33670fa2 | 753 | } |
44003728 CH |
754 | |
755 | parent = d_obtain_alias(inode); | |
c35eebe9 | 756 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 757 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
758 | |
759 | return parent; | |
760 | } | |
dbd561d2 MS |
761 | |
762 | static const struct export_operations fuse_export_operations = { | |
763 | .fh_to_dentry = fuse_fh_to_dentry, | |
764 | .fh_to_parent = fuse_fh_to_parent, | |
765 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 766 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
767 | }; |
768 | ||
ee9b6d61 | 769 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
770 | .alloc_inode = fuse_alloc_inode, |
771 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 772 | .evict_inode = fuse_evict_inode, |
ead5f0b5 | 773 | .drop_inode = generic_delete_inode, |
71421259 | 774 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 775 | .put_super = fuse_put_super, |
69a53bf2 | 776 | .umount_begin = fuse_umount_begin, |
e5e5558e | 777 | .statfs = fuse_statfs, |
d8a5ba45 MS |
778 | .show_options = fuse_show_options, |
779 | }; | |
780 | ||
487ea5af CH |
781 | static void sanitize_global_limit(unsigned *limit) |
782 | { | |
783 | if (*limit == 0) | |
784 | *limit = ((num_physpages << PAGE_SHIFT) >> 13) / | |
785 | sizeof(struct fuse_req); | |
786 | ||
787 | if (*limit >= 1 << 16) | |
788 | *limit = (1 << 16) - 1; | |
789 | } | |
790 | ||
791 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
792 | { | |
793 | int rv; | |
794 | ||
795 | rv = param_set_uint(val, kp); | |
796 | if (rv) | |
797 | return rv; | |
798 | ||
799 | sanitize_global_limit((unsigned *)kp->arg); | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
804 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
805 | { | |
806 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
807 | ||
808 | if (arg->minor < 13) | |
809 | return; | |
810 | ||
811 | sanitize_global_limit(&max_user_bgreq); | |
812 | sanitize_global_limit(&max_user_congthresh); | |
813 | ||
814 | if (arg->max_background) { | |
815 | fc->max_background = arg->max_background; | |
816 | ||
817 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
818 | fc->max_background = max_user_bgreq; | |
819 | } | |
820 | if (arg->congestion_threshold) { | |
821 | fc->congestion_threshold = arg->congestion_threshold; | |
822 | ||
823 | if (!cap_sys_admin && | |
824 | fc->congestion_threshold > max_user_congthresh) | |
825 | fc->congestion_threshold = max_user_congthresh; | |
826 | } | |
827 | } | |
828 | ||
9b9a0469 MS |
829 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
830 | { | |
9b9a0469 MS |
831 | struct fuse_init_out *arg = &req->misc.init_out; |
832 | ||
833 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
834 | fc->conn_error = 1; | |
835 | else { | |
9cd68455 MS |
836 | unsigned long ra_pages; |
837 | ||
487ea5af CH |
838 | process_init_limits(fc, arg); |
839 | ||
9cd68455 MS |
840 | if (arg->minor >= 6) { |
841 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
842 | if (arg->flags & FUSE_ASYNC_READ) | |
843 | fc->async_read = 1; | |
71421259 MS |
844 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
845 | fc->no_lock = 1; | |
37fb3a30 MS |
846 | if (arg->minor >= 17) { |
847 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
848 | fc->no_flock = 1; | |
24114504 MS |
849 | } else { |
850 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
851 | fc->no_flock = 1; | |
37fb3a30 | 852 | } |
6ff958ed MS |
853 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
854 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
855 | if (arg->minor >= 9) { |
856 | /* LOOKUP has dependency on proto version */ | |
857 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
858 | fc->export_support = 1; | |
859 | } | |
78bb6cb9 MS |
860 | if (arg->flags & FUSE_BIG_WRITES) |
861 | fc->big_writes = 1; | |
e0a43ddc MS |
862 | if (arg->flags & FUSE_DONT_MASK) |
863 | fc->dont_mask = 1; | |
72d0d248 BF |
864 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
865 | fc->auto_inval_data = 1; | |
0b05b183 AA |
866 | if (arg->flags & FUSE_DO_READDIRPLUS) |
867 | fc->do_readdirplus = 1; | |
71421259 | 868 | } else { |
9cd68455 | 869 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 | 870 | fc->no_lock = 1; |
37fb3a30 | 871 | fc->no_flock = 1; |
71421259 | 872 | } |
9cd68455 MS |
873 | |
874 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
875 | fc->minor = arg->minor; |
876 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 877 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 878 | fc->conn_init = 1; |
9b9a0469 | 879 | } |
08a53cdc MS |
880 | fc->blocked = 0; |
881 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
882 | } |
883 | ||
ce1d5a49 | 884 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 885 | { |
9b9a0469 | 886 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 887 | |
9b9a0469 MS |
888 | arg->major = FUSE_KERNEL_VERSION; |
889 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 890 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 891 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 892 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 893 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
0b05b183 AA |
894 | FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
895 | FUSE_DO_READDIRPLUS; | |
9b9a0469 MS |
896 | req->in.h.opcode = FUSE_INIT; |
897 | req->in.numargs = 1; | |
898 | req->in.args[0].size = sizeof(*arg); | |
899 | req->in.args[0].value = arg; | |
900 | req->out.numargs = 1; | |
3ad2f3fb | 901 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
902 | with interface version < 7.5. Rest of init_out is zeroed |
903 | by do_get_request(), so a short reply is not a problem */ | |
904 | req->out.argvar = 1; | |
905 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
906 | req->out.args[0].value = &req->misc.init_out; | |
907 | req->end = process_init_reply; | |
b93f858a | 908 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
909 | } |
910 | ||
43901aab TH |
911 | static void fuse_free_conn(struct fuse_conn *fc) |
912 | { | |
913 | kfree(fc); | |
914 | } | |
915 | ||
a325f9b9 TH |
916 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
917 | { | |
918 | int err; | |
919 | ||
d993831f | 920 | fc->bdi.name = "fuse"; |
a325f9b9 | 921 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
a325f9b9 TH |
922 | /* fuse does it's own writeback accounting */ |
923 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
924 | ||
925 | err = bdi_init(&fc->bdi); | |
926 | if (err) | |
927 | return err; | |
928 | ||
929 | fc->bdi_initialized = 1; | |
930 | ||
931 | if (sb->s_bdev) { | |
932 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
933 | MAJOR(fc->dev), MINOR(fc->dev)); | |
934 | } else { | |
935 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
936 | } | |
937 | ||
938 | if (err) | |
939 | return err; | |
940 | ||
941 | /* | |
942 | * For a single fuse filesystem use max 1% of dirty + | |
943 | * writeback threshold. | |
944 | * | |
945 | * This gives about 1M of write buffer for memory maps on a | |
946 | * machine with 1G and 10% dirty_ratio, which should be more | |
947 | * than enough. | |
948 | * | |
949 | * Privileged users can raise it by writing to | |
950 | * | |
951 | * /sys/class/bdi/<bdi>/max_ratio | |
952 | */ | |
953 | bdi_set_max_ratio(&fc->bdi, 1); | |
954 | ||
955 | return 0; | |
956 | } | |
957 | ||
d8a5ba45 MS |
958 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
959 | { | |
960 | struct fuse_conn *fc; | |
961 | struct inode *root; | |
962 | struct fuse_mount_data d; | |
963 | struct file *file; | |
f543f253 | 964 | struct dentry *root_dentry; |
ce1d5a49 | 965 | struct fuse_req *init_req; |
d8a5ba45 | 966 | int err; |
d8091614 | 967 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 968 | |
c2b8f006 | 969 | err = -EINVAL; |
71421259 | 970 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 971 | goto err; |
71421259 | 972 | |
9e1f1de0 AV |
973 | sb->s_flags &= ~MS_NOSEC; |
974 | ||
d8091614 | 975 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 976 | goto err; |
d8a5ba45 | 977 | |
d8091614 | 978 | if (is_bdev) { |
875d95ec | 979 | #ifdef CONFIG_BLOCK |
c2b8f006 | 980 | err = -EINVAL; |
d8091614 | 981 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 982 | goto err; |
875d95ec | 983 | #endif |
d8091614 MS |
984 | } else { |
985 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
986 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
987 | } | |
d8a5ba45 MS |
988 | sb->s_magic = FUSE_SUPER_MAGIC; |
989 | sb->s_op = &fuse_super_operations; | |
990 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
0a2da9b2 | 991 | sb->s_time_gran = 1; |
dbd561d2 | 992 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
993 | |
994 | file = fget(d.fd); | |
c2b8f006 | 995 | err = -EINVAL; |
d8a5ba45 | 996 | if (!file) |
c2b8f006 | 997 | goto err; |
d8a5ba45 | 998 | |
499dcf20 EB |
999 | if ((file->f_op != &fuse_dev_operations) || |
1000 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1001 | goto err_fput; |
0720b315 | 1002 | |
0d179aa5 | 1003 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1004 | err = -ENOMEM; |
1005 | if (!fc) | |
1006 | goto err_fput; | |
d8a5ba45 | 1007 | |
a325f9b9 TH |
1008 | fuse_conn_init(fc); |
1009 | ||
1010 | fc->dev = sb->s_dev; | |
3b463ae0 | 1011 | fc->sb = sb; |
a325f9b9 TH |
1012 | err = fuse_bdi_init(fc, sb); |
1013 | if (err) | |
1014 | goto err_put_conn; | |
0d179aa5 | 1015 | |
32a88aa1 JA |
1016 | sb->s_bdi = &fc->bdi; |
1017 | ||
e0a43ddc MS |
1018 | /* Handle umasking inside the fuse code */ |
1019 | if (sb->s_flags & MS_POSIXACL) | |
1020 | fc->dont_mask = 1; | |
1021 | sb->s_flags |= MS_POSIXACL; | |
1022 | ||
43901aab | 1023 | fc->release = fuse_free_conn; |
1e9a4ed9 | 1024 | fc->flags = d.flags; |
d8a5ba45 | 1025 | fc->user_id = d.user_id; |
87729a55 | 1026 | fc->group_id = d.group_id; |
f948d564 | 1027 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1028 | |
f543f253 MS |
1029 | /* Used by get_root_inode() */ |
1030 | sb->s_fs_info = fc; | |
1031 | ||
d8a5ba45 | 1032 | err = -ENOMEM; |
b93f858a | 1033 | root = fuse_get_root_inode(sb, d.rootmode); |
48fde701 AV |
1034 | root_dentry = d_make_root(root); |
1035 | if (!root_dentry) | |
c2b8f006 | 1036 | goto err_put_conn; |
c35eebe9 AV |
1037 | /* only now - we want root dentry with NULL ->d_op */ |
1038 | sb->s_d_op = &fuse_dentry_operations; | |
f543f253 | 1039 | |
4250c066 | 1040 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1041 | if (!init_req) |
1042 | goto err_put_root; | |
1043 | ||
0ec7ca41 | 1044 | if (is_bdev) { |
4250c066 | 1045 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1046 | if (!fc->destroy_req) |
17e18ab6 | 1047 | goto err_free_init_req; |
0ec7ca41 MS |
1048 | } |
1049 | ||
bafa9654 | 1050 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1051 | err = -EINVAL; |
1052 | if (file->private_data) | |
bafa9654 | 1053 | goto err_unlock; |
8aa09a50 | 1054 | |
bafa9654 MS |
1055 | err = fuse_ctl_add_conn(fc); |
1056 | if (err) | |
1057 | goto err_unlock; | |
1058 | ||
1059 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1060 | sb->s_root = root_dentry; |
f543f253 | 1061 | fc->connected = 1; |
bafa9654 MS |
1062 | file->private_data = fuse_conn_get(fc); |
1063 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
1064 | /* |
1065 | * atomic_dec_and_test() in fput() provides the necessary | |
1066 | * memory barrier for file->private_data to be visible on all | |
1067 | * CPUs after this | |
1068 | */ | |
1069 | fput(file); | |
f543f253 | 1070 | |
ce1d5a49 | 1071 | fuse_send_init(fc, init_req); |
f543f253 | 1072 | |
d8a5ba45 MS |
1073 | return 0; |
1074 | ||
bafa9654 MS |
1075 | err_unlock: |
1076 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1077 | err_free_init_req: |
ce1d5a49 | 1078 | fuse_request_free(init_req); |
f543f253 MS |
1079 | err_put_root: |
1080 | dput(root_dentry); | |
c2b8f006 | 1081 | err_put_conn: |
a325f9b9 | 1082 | fuse_bdi_destroy(fc); |
bafa9654 | 1083 | fuse_conn_put(fc); |
c2b8f006 MS |
1084 | err_fput: |
1085 | fput(file); | |
1086 | err: | |
d8a5ba45 MS |
1087 | return err; |
1088 | } | |
1089 | ||
3c26ff6e | 1090 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1091 | int flags, const char *dev_name, |
3c26ff6e | 1092 | void *raw_data) |
d8a5ba45 | 1093 | { |
3c26ff6e | 1094 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1095 | } |
1096 | ||
3b463ae0 JM |
1097 | static void fuse_kill_sb_anon(struct super_block *sb) |
1098 | { | |
1099 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1100 | ||
1101 | if (fc) { | |
1102 | down_write(&fc->killsb); | |
1103 | fc->sb = NULL; | |
1104 | up_write(&fc->killsb); | |
1105 | } | |
1106 | ||
1107 | kill_anon_super(sb); | |
1108 | } | |
1109 | ||
875d95ec MS |
1110 | static struct file_system_type fuse_fs_type = { |
1111 | .owner = THIS_MODULE, | |
1112 | .name = "fuse", | |
79c0b2df | 1113 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1114 | .mount = fuse_mount, |
3b463ae0 | 1115 | .kill_sb = fuse_kill_sb_anon, |
875d95ec MS |
1116 | }; |
1117 | ||
1118 | #ifdef CONFIG_BLOCK | |
152a0836 | 1119 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1120 | int flags, const char *dev_name, |
152a0836 | 1121 | void *raw_data) |
d6392f87 | 1122 | { |
152a0836 | 1123 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1124 | } |
1125 | ||
3b463ae0 JM |
1126 | static void fuse_kill_sb_blk(struct super_block *sb) |
1127 | { | |
1128 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1129 | ||
1130 | if (fc) { | |
1131 | down_write(&fc->killsb); | |
1132 | fc->sb = NULL; | |
1133 | up_write(&fc->killsb); | |
1134 | } | |
1135 | ||
1136 | kill_block_super(sb); | |
1137 | } | |
1138 | ||
d6392f87 MS |
1139 | static struct file_system_type fuseblk_fs_type = { |
1140 | .owner = THIS_MODULE, | |
1141 | .name = "fuseblk", | |
152a0836 | 1142 | .mount = fuse_mount_blk, |
3b463ae0 | 1143 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1144 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
1145 | }; |
1146 | ||
875d95ec MS |
1147 | static inline int register_fuseblk(void) |
1148 | { | |
1149 | return register_filesystem(&fuseblk_fs_type); | |
1150 | } | |
1151 | ||
1152 | static inline void unregister_fuseblk(void) | |
1153 | { | |
1154 | unregister_filesystem(&fuseblk_fs_type); | |
1155 | } | |
1156 | #else | |
1157 | static inline int register_fuseblk(void) | |
1158 | { | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | static inline void unregister_fuseblk(void) | |
1163 | { | |
1164 | } | |
1165 | #endif | |
1166 | ||
51cc5068 | 1167 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1168 | { |
1729a16c | 1169 | struct inode *inode = foo; |
d8a5ba45 | 1170 | |
a35afb83 | 1171 | inode_init_once(inode); |
d8a5ba45 MS |
1172 | } |
1173 | ||
1174 | static int __init fuse_fs_init(void) | |
1175 | { | |
1176 | int err; | |
1177 | ||
d6392f87 MS |
1178 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
1179 | sizeof(struct fuse_inode), | |
1180 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1181 | fuse_inode_init_once); |
d6392f87 MS |
1182 | err = -ENOMEM; |
1183 | if (!fuse_inode_cachep) | |
988f0325 AV |
1184 | goto out; |
1185 | ||
1186 | err = register_fuseblk(); | |
1187 | if (err) | |
1188 | goto out2; | |
1189 | ||
1190 | err = register_filesystem(&fuse_fs_type); | |
1191 | if (err) | |
1192 | goto out3; | |
d6392f87 MS |
1193 | |
1194 | return 0; | |
d8a5ba45 | 1195 | |
988f0325 | 1196 | out3: |
875d95ec | 1197 | unregister_fuseblk(); |
988f0325 AV |
1198 | out2: |
1199 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1200 | out: |
d8a5ba45 MS |
1201 | return err; |
1202 | } | |
1203 | ||
1204 | static void fuse_fs_cleanup(void) | |
1205 | { | |
1206 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1207 | unregister_fuseblk(); |
8c0a8537 KS |
1208 | |
1209 | /* | |
1210 | * Make sure all delayed rcu free inodes are flushed before we | |
1211 | * destroy cache. | |
1212 | */ | |
1213 | rcu_barrier(); | |
d8a5ba45 MS |
1214 | kmem_cache_destroy(fuse_inode_cachep); |
1215 | } | |
1216 | ||
5c89e17e GKH |
1217 | static struct kobject *fuse_kobj; |
1218 | static struct kobject *connections_kobj; | |
1219 | ||
f543f253 MS |
1220 | static int fuse_sysfs_init(void) |
1221 | { | |
1222 | int err; | |
1223 | ||
00d26666 | 1224 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1225 | if (!fuse_kobj) { |
1226 | err = -ENOMEM; | |
f543f253 | 1227 | goto out_err; |
5c89e17e | 1228 | } |
f543f253 | 1229 | |
5c89e17e GKH |
1230 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1231 | if (!connections_kobj) { | |
1232 | err = -ENOMEM; | |
f543f253 | 1233 | goto out_fuse_unregister; |
5c89e17e | 1234 | } |
f543f253 MS |
1235 | |
1236 | return 0; | |
1237 | ||
1238 | out_fuse_unregister: | |
197b12d6 | 1239 | kobject_put(fuse_kobj); |
f543f253 MS |
1240 | out_err: |
1241 | return err; | |
1242 | } | |
1243 | ||
1244 | static void fuse_sysfs_cleanup(void) | |
1245 | { | |
197b12d6 GKH |
1246 | kobject_put(connections_kobj); |
1247 | kobject_put(fuse_kobj); | |
f543f253 MS |
1248 | } |
1249 | ||
d8a5ba45 MS |
1250 | static int __init fuse_init(void) |
1251 | { | |
1252 | int res; | |
1253 | ||
1729a16c | 1254 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1255 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1256 | ||
bafa9654 | 1257 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1258 | res = fuse_fs_init(); |
1259 | if (res) | |
1260 | goto err; | |
1261 | ||
334f485d MS |
1262 | res = fuse_dev_init(); |
1263 | if (res) | |
1264 | goto err_fs_cleanup; | |
1265 | ||
f543f253 MS |
1266 | res = fuse_sysfs_init(); |
1267 | if (res) | |
1268 | goto err_dev_cleanup; | |
1269 | ||
bafa9654 MS |
1270 | res = fuse_ctl_init(); |
1271 | if (res) | |
1272 | goto err_sysfs_cleanup; | |
1273 | ||
487ea5af CH |
1274 | sanitize_global_limit(&max_user_bgreq); |
1275 | sanitize_global_limit(&max_user_congthresh); | |
1276 | ||
d8a5ba45 MS |
1277 | return 0; |
1278 | ||
bafa9654 MS |
1279 | err_sysfs_cleanup: |
1280 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1281 | err_dev_cleanup: |
1282 | fuse_dev_cleanup(); | |
334f485d MS |
1283 | err_fs_cleanup: |
1284 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1285 | err: |
1286 | return res; | |
1287 | } | |
1288 | ||
1289 | static void __exit fuse_exit(void) | |
1290 | { | |
1291 | printk(KERN_DEBUG "fuse exit\n"); | |
1292 | ||
bafa9654 | 1293 | fuse_ctl_cleanup(); |
f543f253 | 1294 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1295 | fuse_fs_cleanup(); |
334f485d | 1296 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1297 | } |
1298 | ||
1299 | module_init(fuse_init); | |
1300 | module_exit(fuse_exit); |