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> | |
d8a5ba45 MS |
17 | #include <linux/parser.h> |
18 | #include <linux/statfs.h> | |
9c8ef561 | 19 | #include <linux/random.h> |
e8edc6e0 | 20 | #include <linux/sched.h> |
dbd561d2 | 21 | #include <linux/exportfs.h> |
d8a5ba45 MS |
22 | |
23 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
24 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
e18b890b | 27 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
28 | struct list_head fuse_conn_list; |
29 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
30 | |
31 | #define FUSE_SUPER_MAGIC 0x65735546 | |
32 | ||
d1875dba MS |
33 | #define FUSE_DEFAULT_BLKSIZE 512 |
34 | ||
7a6d3c8b CH |
35 | /** Maximum number of outstanding background requests */ |
36 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
37 | ||
38 | /** Congestion starts at 75% of maximum */ | |
39 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
40 | ||
d8a5ba45 MS |
41 | struct fuse_mount_data { |
42 | int fd; | |
43 | unsigned rootmode; | |
44 | unsigned user_id; | |
87729a55 | 45 | unsigned group_id; |
1729a16c MS |
46 | unsigned fd_present:1; |
47 | unsigned rootmode_present:1; | |
48 | unsigned user_id_present:1; | |
49 | unsigned group_id_present:1; | |
1e9a4ed9 | 50 | unsigned flags; |
db50b96c | 51 | unsigned max_read; |
d8091614 | 52 | unsigned blksize; |
d8a5ba45 MS |
53 | }; |
54 | ||
55 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
56 | { | |
57 | struct inode *inode; | |
58 | struct fuse_inode *fi; | |
59 | ||
e94b1766 | 60 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
61 | if (!inode) |
62 | return NULL; | |
63 | ||
64 | fi = get_fuse_inode(inode); | |
0a0898cf | 65 | fi->i_time = 0; |
d8a5ba45 | 66 | fi->nodeid = 0; |
9e6268db | 67 | fi->nlookup = 0; |
fbee36b9 | 68 | fi->attr_version = 0; |
3be5a52b | 69 | fi->writectr = 0; |
93a8c3cd | 70 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
71 | INIT_LIST_HEAD(&fi->queued_writes); |
72 | INIT_LIST_HEAD(&fi->writepages); | |
73 | init_waitqueue_head(&fi->page_waitq); | |
e5e5558e MS |
74 | fi->forget_req = fuse_request_alloc(); |
75 | if (!fi->forget_req) { | |
76 | kmem_cache_free(fuse_inode_cachep, inode); | |
77 | return NULL; | |
78 | } | |
d8a5ba45 MS |
79 | |
80 | return inode; | |
81 | } | |
82 | ||
83 | static void fuse_destroy_inode(struct inode *inode) | |
84 | { | |
e5e5558e | 85 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 86 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 87 | BUG_ON(!list_empty(&fi->queued_writes)); |
e5e5558e MS |
88 | if (fi->forget_req) |
89 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
90 | kmem_cache_free(fuse_inode_cachep, inode); |
91 | } | |
92 | ||
e5e5558e | 93 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
b48badf0 | 94 | u64 nodeid, u64 nlookup) |
e5e5558e MS |
95 | { |
96 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 97 | inarg->nlookup = nlookup; |
e5e5558e MS |
98 | req->in.h.opcode = FUSE_FORGET; |
99 | req->in.h.nodeid = nodeid; | |
100 | req->in.numargs = 1; | |
101 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
102 | req->in.args[0].value = inarg; | |
b93f858a | 103 | fuse_request_send_noreply(fc, req); |
e5e5558e MS |
104 | } |
105 | ||
d8a5ba45 MS |
106 | static void fuse_clear_inode(struct inode *inode) |
107 | { | |
1e9a4ed9 MS |
108 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
109 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 110 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 111 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
112 | fi->forget_req = NULL; |
113 | } | |
d8a5ba45 MS |
114 | } |
115 | ||
71421259 MS |
116 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
117 | { | |
118 | if (*flags & MS_MANDLOCK) | |
119 | return -EINVAL; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
3be5a52b | 124 | void fuse_truncate(struct address_space *mapping, loff_t offset) |
e00d2c2d MS |
125 | { |
126 | /* See vmtruncate() */ | |
127 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
128 | truncate_inode_pages(mapping, offset); | |
129 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
130 | } | |
131 | ||
3be5a52b MS |
132 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
133 | u64 attr_valid) | |
d8a5ba45 | 134 | { |
9ffbb916 | 135 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 136 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 137 | |
1fb69e78 MS |
138 | fi->attr_version = ++fc->attr_version; |
139 | fi->i_time = attr_valid; | |
140 | ||
d8a5ba45 | 141 | inode->i_ino = attr->ino; |
ebc14c4d | 142 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
d8a5ba45 MS |
143 | inode->i_nlink = attr->nlink; |
144 | inode->i_uid = attr->uid; | |
145 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
146 | inode->i_blocks = attr->blocks; |
147 | inode->i_atime.tv_sec = attr->atime; | |
148 | inode->i_atime.tv_nsec = attr->atimensec; | |
149 | inode->i_mtime.tv_sec = attr->mtime; | |
150 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
151 | inode->i_ctime.tv_sec = attr->ctime; | |
152 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 153 | |
0e9663ee MS |
154 | if (attr->blksize != 0) |
155 | inode->i_blkbits = ilog2(attr->blksize); | |
156 | else | |
157 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
158 | ||
ebc14c4d MS |
159 | /* |
160 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
161 | * to check permissions. This prevents failures due to the | |
162 | * check in may_delete(). | |
163 | */ | |
164 | fi->orig_i_mode = inode->i_mode; | |
165 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
166 | inode->i_mode &= ~S_ISVTX; | |
3be5a52b MS |
167 | } |
168 | ||
169 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
170 | u64 attr_valid, u64 attr_version) | |
171 | { | |
172 | struct fuse_conn *fc = get_fuse_conn(inode); | |
173 | struct fuse_inode *fi = get_fuse_inode(inode); | |
174 | loff_t oldsize; | |
175 | ||
176 | spin_lock(&fc->lock); | |
177 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
178 | spin_unlock(&fc->lock); | |
179 | return; | |
180 | } | |
181 | ||
182 | fuse_change_attributes_common(inode, attr, attr_valid); | |
ebc14c4d | 183 | |
e00d2c2d MS |
184 | oldsize = inode->i_size; |
185 | i_size_write(inode, attr->size); | |
186 | spin_unlock(&fc->lock); | |
187 | ||
188 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
189 | if (attr->size < oldsize) | |
190 | fuse_truncate(inode->i_mapping, attr->size); | |
b1009979 | 191 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 192 | } |
d8a5ba45 MS |
193 | } |
194 | ||
195 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
196 | { | |
197 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 198 | inode->i_size = attr->size; |
e5e5558e MS |
199 | if (S_ISREG(inode->i_mode)) { |
200 | fuse_init_common(inode); | |
b6aeaded | 201 | fuse_init_file_inode(inode); |
e5e5558e MS |
202 | } else if (S_ISDIR(inode->i_mode)) |
203 | fuse_init_dir(inode); | |
204 | else if (S_ISLNK(inode->i_mode)) | |
205 | fuse_init_symlink(inode); | |
206 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
207 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
208 | fuse_init_common(inode); | |
209 | init_special_inode(inode, inode->i_mode, | |
210 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
211 | } else |
212 | BUG(); | |
d8a5ba45 MS |
213 | } |
214 | ||
3b463ae0 | 215 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 216 | { |
b48badf0 | 217 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
218 | if (get_node_id(inode) == nodeid) |
219 | return 1; | |
220 | else | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
225 | { | |
b48badf0 | 226 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
227 | get_fuse_inode(inode)->nodeid = nodeid; |
228 | return 0; | |
229 | } | |
230 | ||
b48badf0 | 231 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
232 | int generation, struct fuse_attr *attr, |
233 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
234 | { |
235 | struct inode *inode; | |
9e6268db | 236 | struct fuse_inode *fi; |
d8a5ba45 | 237 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
238 | |
239 | retry: | |
240 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
241 | if (!inode) | |
242 | return NULL; | |
243 | ||
244 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 245 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
246 | inode->i_generation = generation; |
247 | inode->i_data.backing_dev_info = &fc->bdi; | |
248 | fuse_init_inode(inode, attr); | |
249 | unlock_new_inode(inode); | |
250 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
251 | /* Inode has changed type, any I/O on the old should fail */ |
252 | make_bad_inode(inode); | |
253 | iput(inode); | |
d8a5ba45 MS |
254 | goto retry; |
255 | } | |
256 | ||
9e6268db | 257 | fi = get_fuse_inode(inode); |
8da5ff23 | 258 | spin_lock(&fc->lock); |
1729a16c | 259 | fi->nlookup++; |
8da5ff23 | 260 | spin_unlock(&fc->lock); |
1fb69e78 MS |
261 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
262 | ||
d8a5ba45 MS |
263 | return inode; |
264 | } | |
265 | ||
3b463ae0 JM |
266 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
267 | loff_t offset, loff_t len) | |
268 | { | |
269 | struct inode *inode; | |
270 | pgoff_t pg_start; | |
271 | pgoff_t pg_end; | |
272 | ||
273 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
274 | if (!inode) | |
275 | return -ENOENT; | |
276 | ||
277 | fuse_invalidate_attr(inode); | |
278 | if (offset >= 0) { | |
279 | pg_start = offset >> PAGE_CACHE_SHIFT; | |
280 | if (len <= 0) | |
281 | pg_end = -1; | |
282 | else | |
283 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
284 | invalidate_inode_pages2_range(inode->i_mapping, | |
285 | pg_start, pg_end); | |
286 | } | |
287 | iput(inode); | |
288 | return 0; | |
289 | } | |
290 | ||
42faad99 | 291 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 292 | { |
42faad99 | 293 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
294 | } |
295 | ||
0ec7ca41 MS |
296 | static void fuse_send_destroy(struct fuse_conn *fc) |
297 | { | |
298 | struct fuse_req *req = fc->destroy_req; | |
299 | if (req && fc->conn_init) { | |
300 | fc->destroy_req = NULL; | |
301 | req->in.h.opcode = FUSE_DESTROY; | |
302 | req->force = 1; | |
b93f858a | 303 | fuse_request_send(fc, req); |
0ec7ca41 MS |
304 | fuse_put_request(fc, req); |
305 | } | |
306 | } | |
307 | ||
a325f9b9 | 308 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 309 | { |
a325f9b9 TH |
310 | if (fc->bdi_initialized) |
311 | bdi_destroy(&fc->bdi); | |
312 | } | |
d8a5ba45 | 313 | |
08cbf542 | 314 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 315 | { |
d7133114 | 316 | spin_lock(&fc->lock); |
9ba7cbba | 317 | fc->connected = 0; |
51eb01e7 | 318 | fc->blocked = 0; |
d7133114 | 319 | spin_unlock(&fc->lock); |
334f485d | 320 | /* Flush all readers on this fs */ |
385a17bf | 321 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 322 | wake_up_all(&fc->waitq); |
51eb01e7 | 323 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 324 | wake_up_all(&fc->reserved_req_waitq); |
bafa9654 MS |
325 | mutex_lock(&fuse_mutex); |
326 | list_del(&fc->entry); | |
327 | fuse_ctl_remove_conn(fc); | |
328 | mutex_unlock(&fuse_mutex); | |
a325f9b9 TH |
329 | fuse_bdi_destroy(fc); |
330 | } | |
08cbf542 | 331 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
332 | |
333 | static void fuse_put_super(struct super_block *sb) | |
334 | { | |
335 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
336 | ||
337 | fuse_send_destroy(fc); | |
338 | fuse_conn_kill(fc); | |
bafa9654 | 339 | fuse_conn_put(fc); |
d8a5ba45 MS |
340 | } |
341 | ||
e5e5558e MS |
342 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
343 | { | |
344 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
345 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 346 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
347 | stbuf->f_blocks = attr->blocks; |
348 | stbuf->f_bfree = attr->bfree; | |
349 | stbuf->f_bavail = attr->bavail; | |
350 | stbuf->f_files = attr->files; | |
351 | stbuf->f_ffree = attr->ffree; | |
352 | stbuf->f_namelen = attr->namelen; | |
353 | /* fsid is left zero */ | |
354 | } | |
355 | ||
726c3342 | 356 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 357 | { |
726c3342 | 358 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
359 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
360 | struct fuse_req *req; | |
361 | struct fuse_statfs_out outarg; | |
362 | int err; | |
363 | ||
e57ac683 MS |
364 | if (!fuse_allow_task(fc, current)) { |
365 | buf->f_type = FUSE_SUPER_MAGIC; | |
366 | return 0; | |
367 | } | |
368 | ||
ce1d5a49 MS |
369 | req = fuse_get_req(fc); |
370 | if (IS_ERR(req)) | |
371 | return PTR_ERR(req); | |
e5e5558e | 372 | |
de5f1202 | 373 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
374 | req->in.numargs = 0; |
375 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 376 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 377 | req->out.numargs = 1; |
de5f1202 MS |
378 | req->out.args[0].size = |
379 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 380 | req->out.args[0].value = &outarg; |
b93f858a | 381 | fuse_request_send(fc, req); |
e5e5558e MS |
382 | err = req->out.h.error; |
383 | if (!err) | |
384 | convert_fuse_statfs(buf, &outarg.st); | |
385 | fuse_put_request(fc, req); | |
386 | return err; | |
387 | } | |
388 | ||
d8a5ba45 MS |
389 | enum { |
390 | OPT_FD, | |
391 | OPT_ROOTMODE, | |
392 | OPT_USER_ID, | |
87729a55 | 393 | OPT_GROUP_ID, |
d8a5ba45 MS |
394 | OPT_DEFAULT_PERMISSIONS, |
395 | OPT_ALLOW_OTHER, | |
db50b96c | 396 | OPT_MAX_READ, |
d8091614 | 397 | OPT_BLKSIZE, |
d8a5ba45 MS |
398 | OPT_ERR |
399 | }; | |
400 | ||
a447c093 | 401 | static const match_table_t tokens = { |
d8a5ba45 MS |
402 | {OPT_FD, "fd=%u"}, |
403 | {OPT_ROOTMODE, "rootmode=%o"}, | |
404 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 405 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
406 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
407 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 408 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 409 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
410 | {OPT_ERR, NULL} |
411 | }; | |
412 | ||
d8091614 | 413 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
414 | { |
415 | char *p; | |
416 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 417 | d->max_read = ~0; |
d1875dba | 418 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
419 | |
420 | while ((p = strsep(&opt, ",")) != NULL) { | |
421 | int token; | |
422 | int value; | |
423 | substring_t args[MAX_OPT_ARGS]; | |
424 | if (!*p) | |
425 | continue; | |
426 | ||
427 | token = match_token(p, tokens, args); | |
428 | switch (token) { | |
429 | case OPT_FD: | |
430 | if (match_int(&args[0], &value)) | |
431 | return 0; | |
432 | d->fd = value; | |
5a533682 | 433 | d->fd_present = 1; |
d8a5ba45 MS |
434 | break; |
435 | ||
436 | case OPT_ROOTMODE: | |
437 | if (match_octal(&args[0], &value)) | |
438 | return 0; | |
a5bfffac TS |
439 | if (!fuse_valid_type(value)) |
440 | return 0; | |
d8a5ba45 | 441 | d->rootmode = value; |
5a533682 | 442 | d->rootmode_present = 1; |
d8a5ba45 MS |
443 | break; |
444 | ||
445 | case OPT_USER_ID: | |
446 | if (match_int(&args[0], &value)) | |
447 | return 0; | |
448 | d->user_id = value; | |
5a533682 | 449 | d->user_id_present = 1; |
d8a5ba45 MS |
450 | break; |
451 | ||
87729a55 MS |
452 | case OPT_GROUP_ID: |
453 | if (match_int(&args[0], &value)) | |
454 | return 0; | |
455 | d->group_id = value; | |
5a533682 | 456 | d->group_id_present = 1; |
87729a55 MS |
457 | break; |
458 | ||
1e9a4ed9 MS |
459 | case OPT_DEFAULT_PERMISSIONS: |
460 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
461 | break; | |
462 | ||
463 | case OPT_ALLOW_OTHER: | |
464 | d->flags |= FUSE_ALLOW_OTHER; | |
465 | break; | |
466 | ||
db50b96c MS |
467 | case OPT_MAX_READ: |
468 | if (match_int(&args[0], &value)) | |
469 | return 0; | |
470 | d->max_read = value; | |
471 | break; | |
472 | ||
d8091614 MS |
473 | case OPT_BLKSIZE: |
474 | if (!is_bdev || match_int(&args[0], &value)) | |
475 | return 0; | |
476 | d->blksize = value; | |
477 | break; | |
478 | ||
d8a5ba45 MS |
479 | default: |
480 | return 0; | |
481 | } | |
482 | } | |
5a533682 MS |
483 | |
484 | if (!d->fd_present || !d->rootmode_present || | |
485 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
486 | return 0; |
487 | ||
488 | return 1; | |
489 | } | |
490 | ||
491 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
492 | { | |
493 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
494 | ||
495 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 496 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
497 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
498 | seq_puts(m, ",default_permissions"); | |
499 | if (fc->flags & FUSE_ALLOW_OTHER) | |
500 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
501 | if (fc->max_read != ~0) |
502 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d1875dba MS |
503 | if (mnt->mnt_sb->s_bdev && |
504 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
505 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); | |
d8a5ba45 MS |
506 | return 0; |
507 | } | |
508 | ||
a325f9b9 | 509 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 510 | { |
0d179aa5 TH |
511 | memset(fc, 0, sizeof(*fc)); |
512 | spin_lock_init(&fc->lock); | |
513 | mutex_init(&fc->inst_mutex); | |
3b463ae0 | 514 | init_rwsem(&fc->killsb); |
0d179aa5 TH |
515 | atomic_set(&fc->count, 1); |
516 | init_waitqueue_head(&fc->waitq); | |
517 | init_waitqueue_head(&fc->blocked_waitq); | |
518 | init_waitqueue_head(&fc->reserved_req_waitq); | |
519 | INIT_LIST_HEAD(&fc->pending); | |
520 | INIT_LIST_HEAD(&fc->processing); | |
521 | INIT_LIST_HEAD(&fc->io); | |
522 | INIT_LIST_HEAD(&fc->interrupts); | |
523 | INIT_LIST_HEAD(&fc->bg_queue); | |
524 | INIT_LIST_HEAD(&fc->entry); | |
525 | atomic_set(&fc->num_waiting, 0); | |
7a6d3c8b CH |
526 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
527 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
528 | fc->khctr = 0; |
529 | fc->polled_files = RB_ROOT; | |
0d179aa5 TH |
530 | fc->reqctr = 0; |
531 | fc->blocked = 1; | |
532 | fc->attr_version = 1; | |
533 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 534 | } |
0d179aa5 | 535 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 536 | |
bafa9654 MS |
537 | void fuse_conn_put(struct fuse_conn *fc) |
538 | { | |
d2a85164 | 539 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
540 | if (fc->destroy_req) |
541 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 542 | mutex_destroy(&fc->inst_mutex); |
43901aab | 543 | fc->release(fc); |
d2a85164 | 544 | } |
bafa9654 | 545 | } |
08cbf542 | 546 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
547 | |
548 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
549 | { | |
550 | atomic_inc(&fc->count); | |
551 | return fc; | |
552 | } | |
08cbf542 | 553 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 554 | |
b93f858a | 555 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
556 | { |
557 | struct fuse_attr attr; | |
558 | memset(&attr, 0, sizeof(attr)); | |
559 | ||
560 | attr.mode = mode; | |
561 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 562 | attr.nlink = 1; |
1fb69e78 | 563 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
564 | } |
565 | ||
1729a16c | 566 | struct fuse_inode_handle { |
dbd561d2 MS |
567 | u64 nodeid; |
568 | u32 generation; | |
569 | }; | |
570 | ||
571 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
572 | struct fuse_inode_handle *handle) | |
573 | { | |
33670fa2 | 574 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
575 | struct inode *inode; |
576 | struct dentry *entry; | |
577 | int err = -ESTALE; | |
578 | ||
579 | if (handle->nodeid == 0) | |
580 | goto out_err; | |
581 | ||
582 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
583 | if (!inode) { |
584 | struct fuse_entry_out outarg; | |
585 | struct qstr name; | |
586 | ||
587 | if (!fc->export_support) | |
588 | goto out_err; | |
589 | ||
590 | name.len = 1; | |
591 | name.name = "."; | |
592 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
593 | &inode); | |
594 | if (err && err != -ENOENT) | |
595 | goto out_err; | |
596 | if (err || !inode) { | |
597 | err = -ESTALE; | |
598 | goto out_err; | |
599 | } | |
600 | err = -EIO; | |
601 | if (get_node_id(inode) != handle->nodeid) | |
602 | goto out_iput; | |
603 | } | |
dbd561d2 MS |
604 | err = -ESTALE; |
605 | if (inode->i_generation != handle->generation) | |
606 | goto out_iput; | |
607 | ||
44003728 CH |
608 | entry = d_obtain_alias(inode); |
609 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) { | |
dbd561d2 MS |
610 | entry->d_op = &fuse_dentry_operations; |
611 | fuse_invalidate_entry_cache(entry); | |
612 | } | |
613 | ||
614 | return entry; | |
615 | ||
616 | out_iput: | |
617 | iput(inode); | |
618 | out_err: | |
619 | return ERR_PTR(err); | |
620 | } | |
621 | ||
622 | static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, | |
623 | int connectable) | |
624 | { | |
625 | struct inode *inode = dentry->d_inode; | |
626 | bool encode_parent = connectable && !S_ISDIR(inode->i_mode); | |
627 | int len = encode_parent ? 6 : 3; | |
628 | u64 nodeid; | |
629 | u32 generation; | |
630 | ||
631 | if (*max_len < len) | |
632 | return 255; | |
633 | ||
634 | nodeid = get_fuse_inode(inode)->nodeid; | |
635 | generation = inode->i_generation; | |
636 | ||
637 | fh[0] = (u32)(nodeid >> 32); | |
638 | fh[1] = (u32)(nodeid & 0xffffffff); | |
639 | fh[2] = generation; | |
640 | ||
641 | if (encode_parent) { | |
642 | struct inode *parent; | |
643 | ||
644 | spin_lock(&dentry->d_lock); | |
645 | parent = dentry->d_parent->d_inode; | |
646 | nodeid = get_fuse_inode(parent)->nodeid; | |
647 | generation = parent->i_generation; | |
648 | spin_unlock(&dentry->d_lock); | |
649 | ||
650 | fh[3] = (u32)(nodeid >> 32); | |
651 | fh[4] = (u32)(nodeid & 0xffffffff); | |
652 | fh[5] = generation; | |
653 | } | |
654 | ||
655 | *max_len = len; | |
656 | return encode_parent ? 0x82 : 0x81; | |
657 | } | |
658 | ||
659 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
660 | struct fid *fid, int fh_len, int fh_type) | |
661 | { | |
662 | struct fuse_inode_handle handle; | |
663 | ||
664 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
665 | return NULL; | |
666 | ||
667 | handle.nodeid = (u64) fid->raw[0] << 32; | |
668 | handle.nodeid |= (u64) fid->raw[1]; | |
669 | handle.generation = fid->raw[2]; | |
670 | return fuse_get_dentry(sb, &handle); | |
671 | } | |
672 | ||
673 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
674 | struct fid *fid, int fh_len, int fh_type) | |
675 | { | |
676 | struct fuse_inode_handle parent; | |
677 | ||
678 | if (fh_type != 0x82 || fh_len < 6) | |
679 | return NULL; | |
680 | ||
681 | parent.nodeid = (u64) fid->raw[3] << 32; | |
682 | parent.nodeid |= (u64) fid->raw[4]; | |
683 | parent.generation = fid->raw[5]; | |
684 | return fuse_get_dentry(sb, &parent); | |
685 | } | |
686 | ||
33670fa2 MS |
687 | static struct dentry *fuse_get_parent(struct dentry *child) |
688 | { | |
689 | struct inode *child_inode = child->d_inode; | |
690 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
691 | struct inode *inode; | |
692 | struct dentry *parent; | |
693 | struct fuse_entry_out outarg; | |
694 | struct qstr name; | |
695 | int err; | |
696 | ||
697 | if (!fc->export_support) | |
698 | return ERR_PTR(-ESTALE); | |
699 | ||
700 | name.len = 2; | |
701 | name.name = ".."; | |
702 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
703 | &name, &outarg, &inode); | |
44003728 CH |
704 | if (err) { |
705 | if (err == -ENOENT) | |
706 | return ERR_PTR(-ESTALE); | |
33670fa2 | 707 | return ERR_PTR(err); |
33670fa2 | 708 | } |
44003728 CH |
709 | |
710 | parent = d_obtain_alias(inode); | |
711 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) { | |
33670fa2 MS |
712 | parent->d_op = &fuse_dentry_operations; |
713 | fuse_invalidate_entry_cache(parent); | |
714 | } | |
715 | ||
716 | return parent; | |
717 | } | |
dbd561d2 MS |
718 | |
719 | static const struct export_operations fuse_export_operations = { | |
720 | .fh_to_dentry = fuse_fh_to_dentry, | |
721 | .fh_to_parent = fuse_fh_to_parent, | |
722 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 723 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
724 | }; |
725 | ||
ee9b6d61 | 726 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
727 | .alloc_inode = fuse_alloc_inode, |
728 | .destroy_inode = fuse_destroy_inode, | |
d8a5ba45 | 729 | .clear_inode = fuse_clear_inode, |
ead5f0b5 | 730 | .drop_inode = generic_delete_inode, |
71421259 | 731 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 732 | .put_super = fuse_put_super, |
69a53bf2 | 733 | .umount_begin = fuse_umount_begin, |
e5e5558e | 734 | .statfs = fuse_statfs, |
d8a5ba45 MS |
735 | .show_options = fuse_show_options, |
736 | }; | |
737 | ||
9b9a0469 MS |
738 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
739 | { | |
9b9a0469 MS |
740 | struct fuse_init_out *arg = &req->misc.init_out; |
741 | ||
742 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
743 | fc->conn_error = 1; | |
744 | else { | |
9cd68455 MS |
745 | unsigned long ra_pages; |
746 | ||
7a6d3c8b CH |
747 | if (arg->minor >= 13) { |
748 | if (arg->max_background) | |
749 | fc->max_background = arg->max_background; | |
750 | if (arg->congestion_threshold) | |
751 | fc->congestion_threshold = arg->congestion_threshold; | |
752 | } | |
9cd68455 MS |
753 | if (arg->minor >= 6) { |
754 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
755 | if (arg->flags & FUSE_ASYNC_READ) | |
756 | fc->async_read = 1; | |
71421259 MS |
757 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
758 | fc->no_lock = 1; | |
6ff958ed MS |
759 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
760 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
761 | if (arg->minor >= 9) { |
762 | /* LOOKUP has dependency on proto version */ | |
763 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
764 | fc->export_support = 1; | |
765 | } | |
78bb6cb9 MS |
766 | if (arg->flags & FUSE_BIG_WRITES) |
767 | fc->big_writes = 1; | |
e0a43ddc MS |
768 | if (arg->flags & FUSE_DONT_MASK) |
769 | fc->dont_mask = 1; | |
71421259 | 770 | } else { |
9cd68455 | 771 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
772 | fc->no_lock = 1; |
773 | } | |
9cd68455 MS |
774 | |
775 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
776 | fc->minor = arg->minor; |
777 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 778 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 779 | fc->conn_init = 1; |
9b9a0469 | 780 | } |
08a53cdc MS |
781 | fc->blocked = 0; |
782 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
783 | } |
784 | ||
ce1d5a49 | 785 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 786 | { |
9b9a0469 | 787 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 788 | |
9b9a0469 MS |
789 | arg->major = FUSE_KERNEL_VERSION; |
790 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 791 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 792 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
e0a43ddc | 793 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK; |
9b9a0469 MS |
794 | req->in.h.opcode = FUSE_INIT; |
795 | req->in.numargs = 1; | |
796 | req->in.args[0].size = sizeof(*arg); | |
797 | req->in.args[0].value = arg; | |
798 | req->out.numargs = 1; | |
799 | /* Variable length arguement used for backward compatibility | |
800 | with interface version < 7.5. Rest of init_out is zeroed | |
801 | by do_get_request(), so a short reply is not a problem */ | |
802 | req->out.argvar = 1; | |
803 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
804 | req->out.args[0].value = &req->misc.init_out; | |
805 | req->end = process_init_reply; | |
b93f858a | 806 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
807 | } |
808 | ||
43901aab TH |
809 | static void fuse_free_conn(struct fuse_conn *fc) |
810 | { | |
811 | kfree(fc); | |
812 | } | |
813 | ||
a325f9b9 TH |
814 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
815 | { | |
816 | int err; | |
817 | ||
818 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; | |
819 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
820 | /* fuse does it's own writeback accounting */ | |
821 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
822 | ||
823 | err = bdi_init(&fc->bdi); | |
824 | if (err) | |
825 | return err; | |
826 | ||
827 | fc->bdi_initialized = 1; | |
828 | ||
829 | if (sb->s_bdev) { | |
830 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
831 | MAJOR(fc->dev), MINOR(fc->dev)); | |
832 | } else { | |
833 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
834 | } | |
835 | ||
836 | if (err) | |
837 | return err; | |
838 | ||
839 | /* | |
840 | * For a single fuse filesystem use max 1% of dirty + | |
841 | * writeback threshold. | |
842 | * | |
843 | * This gives about 1M of write buffer for memory maps on a | |
844 | * machine with 1G and 10% dirty_ratio, which should be more | |
845 | * than enough. | |
846 | * | |
847 | * Privileged users can raise it by writing to | |
848 | * | |
849 | * /sys/class/bdi/<bdi>/max_ratio | |
850 | */ | |
851 | bdi_set_max_ratio(&fc->bdi, 1); | |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
d8a5ba45 MS |
856 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
857 | { | |
858 | struct fuse_conn *fc; | |
859 | struct inode *root; | |
860 | struct fuse_mount_data d; | |
861 | struct file *file; | |
f543f253 | 862 | struct dentry *root_dentry; |
ce1d5a49 | 863 | struct fuse_req *init_req; |
d8a5ba45 | 864 | int err; |
d8091614 | 865 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 866 | |
c2b8f006 | 867 | err = -EINVAL; |
71421259 | 868 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 869 | goto err; |
71421259 | 870 | |
d8091614 | 871 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 872 | goto err; |
d8a5ba45 | 873 | |
d8091614 | 874 | if (is_bdev) { |
875d95ec | 875 | #ifdef CONFIG_BLOCK |
c2b8f006 | 876 | err = -EINVAL; |
d8091614 | 877 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 878 | goto err; |
875d95ec | 879 | #endif |
d8091614 MS |
880 | } else { |
881 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
882 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
883 | } | |
d8a5ba45 MS |
884 | sb->s_magic = FUSE_SUPER_MAGIC; |
885 | sb->s_op = &fuse_super_operations; | |
886 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
dbd561d2 | 887 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
888 | |
889 | file = fget(d.fd); | |
c2b8f006 | 890 | err = -EINVAL; |
d8a5ba45 | 891 | if (!file) |
c2b8f006 | 892 | goto err; |
d8a5ba45 | 893 | |
c2b8f006 MS |
894 | if (file->f_op != &fuse_dev_operations) |
895 | goto err_fput; | |
0720b315 | 896 | |
0d179aa5 | 897 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
898 | err = -ENOMEM; |
899 | if (!fc) | |
900 | goto err_fput; | |
d8a5ba45 | 901 | |
a325f9b9 TH |
902 | fuse_conn_init(fc); |
903 | ||
904 | fc->dev = sb->s_dev; | |
3b463ae0 | 905 | fc->sb = sb; |
a325f9b9 TH |
906 | err = fuse_bdi_init(fc, sb); |
907 | if (err) | |
908 | goto err_put_conn; | |
0d179aa5 | 909 | |
e0a43ddc MS |
910 | /* Handle umasking inside the fuse code */ |
911 | if (sb->s_flags & MS_POSIXACL) | |
912 | fc->dont_mask = 1; | |
913 | sb->s_flags |= MS_POSIXACL; | |
914 | ||
43901aab | 915 | fc->release = fuse_free_conn; |
1e9a4ed9 | 916 | fc->flags = d.flags; |
d8a5ba45 | 917 | fc->user_id = d.user_id; |
87729a55 | 918 | fc->group_id = d.group_id; |
f948d564 | 919 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 920 | |
f543f253 MS |
921 | /* Used by get_root_inode() */ |
922 | sb->s_fs_info = fc; | |
923 | ||
d8a5ba45 | 924 | err = -ENOMEM; |
b93f858a | 925 | root = fuse_get_root_inode(sb, d.rootmode); |
f543f253 | 926 | if (!root) |
c2b8f006 | 927 | goto err_put_conn; |
d8a5ba45 | 928 | |
f543f253 MS |
929 | root_dentry = d_alloc_root(root); |
930 | if (!root_dentry) { | |
d8a5ba45 | 931 | iput(root); |
c2b8f006 | 932 | goto err_put_conn; |
d8a5ba45 | 933 | } |
f543f253 | 934 | |
ce1d5a49 MS |
935 | init_req = fuse_request_alloc(); |
936 | if (!init_req) | |
937 | goto err_put_root; | |
938 | ||
0ec7ca41 MS |
939 | if (is_bdev) { |
940 | fc->destroy_req = fuse_request_alloc(); | |
941 | if (!fc->destroy_req) | |
17e18ab6 | 942 | goto err_free_init_req; |
0ec7ca41 MS |
943 | } |
944 | ||
bafa9654 | 945 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
946 | err = -EINVAL; |
947 | if (file->private_data) | |
bafa9654 | 948 | goto err_unlock; |
8aa09a50 | 949 | |
bafa9654 MS |
950 | err = fuse_ctl_add_conn(fc); |
951 | if (err) | |
952 | goto err_unlock; | |
953 | ||
954 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 955 | sb->s_root = root_dentry; |
f543f253 | 956 | fc->connected = 1; |
bafa9654 MS |
957 | file->private_data = fuse_conn_get(fc); |
958 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
959 | /* |
960 | * atomic_dec_and_test() in fput() provides the necessary | |
961 | * memory barrier for file->private_data to be visible on all | |
962 | * CPUs after this | |
963 | */ | |
964 | fput(file); | |
f543f253 | 965 | |
ce1d5a49 | 966 | fuse_send_init(fc, init_req); |
f543f253 | 967 | |
d8a5ba45 MS |
968 | return 0; |
969 | ||
bafa9654 MS |
970 | err_unlock: |
971 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 972 | err_free_init_req: |
ce1d5a49 | 973 | fuse_request_free(init_req); |
f543f253 MS |
974 | err_put_root: |
975 | dput(root_dentry); | |
c2b8f006 | 976 | err_put_conn: |
a325f9b9 | 977 | fuse_bdi_destroy(fc); |
bafa9654 | 978 | fuse_conn_put(fc); |
c2b8f006 MS |
979 | err_fput: |
980 | fput(file); | |
981 | err: | |
d8a5ba45 MS |
982 | return err; |
983 | } | |
984 | ||
454e2398 DH |
985 | static int fuse_get_sb(struct file_system_type *fs_type, |
986 | int flags, const char *dev_name, | |
987 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 988 | { |
454e2398 | 989 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
990 | } |
991 | ||
3b463ae0 JM |
992 | static void fuse_kill_sb_anon(struct super_block *sb) |
993 | { | |
994 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
995 | ||
996 | if (fc) { | |
997 | down_write(&fc->killsb); | |
998 | fc->sb = NULL; | |
999 | up_write(&fc->killsb); | |
1000 | } | |
1001 | ||
1002 | kill_anon_super(sb); | |
1003 | } | |
1004 | ||
875d95ec MS |
1005 | static struct file_system_type fuse_fs_type = { |
1006 | .owner = THIS_MODULE, | |
1007 | .name = "fuse", | |
79c0b2df | 1008 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec | 1009 | .get_sb = fuse_get_sb, |
3b463ae0 | 1010 | .kill_sb = fuse_kill_sb_anon, |
875d95ec MS |
1011 | }; |
1012 | ||
1013 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
1014 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
1015 | int flags, const char *dev_name, | |
1016 | void *raw_data, struct vfsmount *mnt) | |
1017 | { | |
1018 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
1019 | mnt); | |
1020 | } | |
1021 | ||
3b463ae0 JM |
1022 | static void fuse_kill_sb_blk(struct super_block *sb) |
1023 | { | |
1024 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1025 | ||
1026 | if (fc) { | |
1027 | down_write(&fc->killsb); | |
1028 | fc->sb = NULL; | |
1029 | up_write(&fc->killsb); | |
1030 | } | |
1031 | ||
1032 | kill_block_super(sb); | |
1033 | } | |
1034 | ||
d6392f87 MS |
1035 | static struct file_system_type fuseblk_fs_type = { |
1036 | .owner = THIS_MODULE, | |
1037 | .name = "fuseblk", | |
1038 | .get_sb = fuse_get_sb_blk, | |
3b463ae0 | 1039 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1040 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
1041 | }; |
1042 | ||
875d95ec MS |
1043 | static inline int register_fuseblk(void) |
1044 | { | |
1045 | return register_filesystem(&fuseblk_fs_type); | |
1046 | } | |
1047 | ||
1048 | static inline void unregister_fuseblk(void) | |
1049 | { | |
1050 | unregister_filesystem(&fuseblk_fs_type); | |
1051 | } | |
1052 | #else | |
1053 | static inline int register_fuseblk(void) | |
1054 | { | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | static inline void unregister_fuseblk(void) | |
1059 | { | |
1060 | } | |
1061 | #endif | |
1062 | ||
51cc5068 | 1063 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1064 | { |
1729a16c | 1065 | struct inode *inode = foo; |
d8a5ba45 | 1066 | |
a35afb83 | 1067 | inode_init_once(inode); |
d8a5ba45 MS |
1068 | } |
1069 | ||
1070 | static int __init fuse_fs_init(void) | |
1071 | { | |
1072 | int err; | |
1073 | ||
1074 | err = register_filesystem(&fuse_fs_type); | |
1075 | if (err) | |
d6392f87 MS |
1076 | goto out; |
1077 | ||
875d95ec | 1078 | err = register_fuseblk(); |
d6392f87 MS |
1079 | if (err) |
1080 | goto out_unreg; | |
1081 | ||
1082 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
1083 | sizeof(struct fuse_inode), | |
1084 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1085 | fuse_inode_init_once); |
d6392f87 MS |
1086 | err = -ENOMEM; |
1087 | if (!fuse_inode_cachep) | |
1088 | goto out_unreg2; | |
1089 | ||
1090 | return 0; | |
d8a5ba45 | 1091 | |
d6392f87 | 1092 | out_unreg2: |
875d95ec | 1093 | unregister_fuseblk(); |
d6392f87 MS |
1094 | out_unreg: |
1095 | unregister_filesystem(&fuse_fs_type); | |
1096 | out: | |
d8a5ba45 MS |
1097 | return err; |
1098 | } | |
1099 | ||
1100 | static void fuse_fs_cleanup(void) | |
1101 | { | |
1102 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1103 | unregister_fuseblk(); |
d8a5ba45 MS |
1104 | kmem_cache_destroy(fuse_inode_cachep); |
1105 | } | |
1106 | ||
5c89e17e GKH |
1107 | static struct kobject *fuse_kobj; |
1108 | static struct kobject *connections_kobj; | |
1109 | ||
f543f253 MS |
1110 | static int fuse_sysfs_init(void) |
1111 | { | |
1112 | int err; | |
1113 | ||
00d26666 | 1114 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1115 | if (!fuse_kobj) { |
1116 | err = -ENOMEM; | |
f543f253 | 1117 | goto out_err; |
5c89e17e | 1118 | } |
f543f253 | 1119 | |
5c89e17e GKH |
1120 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1121 | if (!connections_kobj) { | |
1122 | err = -ENOMEM; | |
f543f253 | 1123 | goto out_fuse_unregister; |
5c89e17e | 1124 | } |
f543f253 MS |
1125 | |
1126 | return 0; | |
1127 | ||
1128 | out_fuse_unregister: | |
197b12d6 | 1129 | kobject_put(fuse_kobj); |
f543f253 MS |
1130 | out_err: |
1131 | return err; | |
1132 | } | |
1133 | ||
1134 | static void fuse_sysfs_cleanup(void) | |
1135 | { | |
197b12d6 GKH |
1136 | kobject_put(connections_kobj); |
1137 | kobject_put(fuse_kobj); | |
f543f253 MS |
1138 | } |
1139 | ||
d8a5ba45 MS |
1140 | static int __init fuse_init(void) |
1141 | { | |
1142 | int res; | |
1143 | ||
1729a16c | 1144 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1145 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1146 | ||
bafa9654 | 1147 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1148 | res = fuse_fs_init(); |
1149 | if (res) | |
1150 | goto err; | |
1151 | ||
334f485d MS |
1152 | res = fuse_dev_init(); |
1153 | if (res) | |
1154 | goto err_fs_cleanup; | |
1155 | ||
f543f253 MS |
1156 | res = fuse_sysfs_init(); |
1157 | if (res) | |
1158 | goto err_dev_cleanup; | |
1159 | ||
bafa9654 MS |
1160 | res = fuse_ctl_init(); |
1161 | if (res) | |
1162 | goto err_sysfs_cleanup; | |
1163 | ||
d8a5ba45 MS |
1164 | return 0; |
1165 | ||
bafa9654 MS |
1166 | err_sysfs_cleanup: |
1167 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1168 | err_dev_cleanup: |
1169 | fuse_dev_cleanup(); | |
334f485d MS |
1170 | err_fs_cleanup: |
1171 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1172 | err: |
1173 | return res; | |
1174 | } | |
1175 | ||
1176 | static void __exit fuse_exit(void) | |
1177 | { | |
1178 | printk(KERN_DEBUG "fuse exit\n"); | |
1179 | ||
bafa9654 | 1180 | fuse_ctl_cleanup(); |
f543f253 | 1181 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1182 | fuse_fs_cleanup(); |
334f485d | 1183 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1184 | } |
1185 | ||
1186 | module_init(fuse_init); | |
1187 | module_exit(fuse_exit); |