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Commit | Line | Data |
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d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
3 | Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> | |
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> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
d8a5ba45 MS |
18 | #include <linux/parser.h> |
19 | #include <linux/statfs.h> | |
20 | ||
21 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
22 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
25 | spinlock_t fuse_lock; | |
26 | static kmem_cache_t *fuse_inode_cachep; | |
d8a5ba45 MS |
27 | |
28 | #define FUSE_SUPER_MAGIC 0x65735546 | |
29 | ||
30 | struct fuse_mount_data { | |
31 | int fd; | |
32 | unsigned rootmode; | |
33 | unsigned user_id; | |
87729a55 | 34 | unsigned group_id; |
5a533682 MS |
35 | unsigned fd_present : 1; |
36 | unsigned rootmode_present : 1; | |
37 | unsigned user_id_present : 1; | |
38 | unsigned group_id_present : 1; | |
1e9a4ed9 | 39 | unsigned flags; |
db50b96c | 40 | unsigned max_read; |
d8a5ba45 MS |
41 | }; |
42 | ||
43 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
44 | { | |
45 | struct inode *inode; | |
46 | struct fuse_inode *fi; | |
47 | ||
48 | inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL); | |
49 | if (!inode) | |
50 | return NULL; | |
51 | ||
52 | fi = get_fuse_inode(inode); | |
53 | fi->i_time = jiffies - 1; | |
54 | fi->nodeid = 0; | |
9e6268db | 55 | fi->nlookup = 0; |
e5e5558e MS |
56 | fi->forget_req = fuse_request_alloc(); |
57 | if (!fi->forget_req) { | |
58 | kmem_cache_free(fuse_inode_cachep, inode); | |
59 | return NULL; | |
60 | } | |
d8a5ba45 MS |
61 | |
62 | return inode; | |
63 | } | |
64 | ||
65 | static void fuse_destroy_inode(struct inode *inode) | |
66 | { | |
e5e5558e MS |
67 | struct fuse_inode *fi = get_fuse_inode(inode); |
68 | if (fi->forget_req) | |
69 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
70 | kmem_cache_free(fuse_inode_cachep, inode); |
71 | } | |
72 | ||
73 | static void fuse_read_inode(struct inode *inode) | |
74 | { | |
75 | /* No op */ | |
76 | } | |
77 | ||
e5e5558e | 78 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
9e6268db | 79 | unsigned long nodeid, u64 nlookup) |
e5e5558e MS |
80 | { |
81 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 82 | inarg->nlookup = nlookup; |
e5e5558e MS |
83 | req->in.h.opcode = FUSE_FORGET; |
84 | req->in.h.nodeid = nodeid; | |
85 | req->in.numargs = 1; | |
86 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
87 | req->in.args[0].value = inarg; | |
88 | request_send_noreply(fc, req); | |
89 | } | |
90 | ||
d8a5ba45 MS |
91 | static void fuse_clear_inode(struct inode *inode) |
92 | { | |
1e9a4ed9 MS |
93 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
94 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 95 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 96 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
97 | fi->forget_req = NULL; |
98 | } | |
d8a5ba45 MS |
99 | } |
100 | ||
101 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) | |
102 | { | |
103 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) | |
104 | invalidate_inode_pages(inode->i_mapping); | |
105 | ||
106 | inode->i_ino = attr->ino; | |
107 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); | |
108 | inode->i_nlink = attr->nlink; | |
109 | inode->i_uid = attr->uid; | |
110 | inode->i_gid = attr->gid; | |
111 | i_size_write(inode, attr->size); | |
112 | inode->i_blksize = PAGE_CACHE_SIZE; | |
113 | inode->i_blocks = attr->blocks; | |
114 | inode->i_atime.tv_sec = attr->atime; | |
115 | inode->i_atime.tv_nsec = attr->atimensec; | |
116 | inode->i_mtime.tv_sec = attr->mtime; | |
117 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
118 | inode->i_ctime.tv_sec = attr->ctime; | |
119 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
120 | } | |
121 | ||
122 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
123 | { | |
124 | inode->i_mode = attr->mode & S_IFMT; | |
125 | i_size_write(inode, attr->size); | |
e5e5558e MS |
126 | if (S_ISREG(inode->i_mode)) { |
127 | fuse_init_common(inode); | |
b6aeaded | 128 | fuse_init_file_inode(inode); |
e5e5558e MS |
129 | } else if (S_ISDIR(inode->i_mode)) |
130 | fuse_init_dir(inode); | |
131 | else if (S_ISLNK(inode->i_mode)) | |
132 | fuse_init_symlink(inode); | |
133 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
134 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
135 | fuse_init_common(inode); | |
136 | init_special_inode(inode, inode->i_mode, | |
137 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
138 | } else |
139 | BUG(); | |
d8a5ba45 MS |
140 | } |
141 | ||
142 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
143 | { | |
144 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
145 | if (get_node_id(inode) == nodeid) | |
146 | return 1; | |
147 | else | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
152 | { | |
153 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
154 | get_fuse_inode(inode)->nodeid = nodeid; | |
155 | return 0; | |
156 | } | |
157 | ||
158 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
9e6268db | 159 | int generation, struct fuse_attr *attr) |
d8a5ba45 MS |
160 | { |
161 | struct inode *inode; | |
9e6268db | 162 | struct fuse_inode *fi; |
d8a5ba45 MS |
163 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
164 | int retried = 0; | |
165 | ||
166 | retry: | |
167 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
168 | if (!inode) | |
169 | return NULL; | |
170 | ||
171 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 172 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
173 | inode->i_generation = generation; |
174 | inode->i_data.backing_dev_info = &fc->bdi; | |
175 | fuse_init_inode(inode, attr); | |
176 | unlock_new_inode(inode); | |
177 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
178 | BUG_ON(retried); | |
179 | /* Inode has changed type, any I/O on the old should fail */ | |
180 | make_bad_inode(inode); | |
181 | iput(inode); | |
182 | retried = 1; | |
183 | goto retry; | |
184 | } | |
185 | ||
9e6268db MS |
186 | fi = get_fuse_inode(inode); |
187 | fi->nlookup ++; | |
d8a5ba45 | 188 | fuse_change_attributes(inode, attr); |
d8a5ba45 MS |
189 | return inode; |
190 | } | |
191 | ||
192 | static void fuse_put_super(struct super_block *sb) | |
193 | { | |
194 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
195 | ||
1e9a4ed9 MS |
196 | down_write(&fc->sbput_sem); |
197 | while (!list_empty(&fc->background)) | |
198 | fuse_release_background(list_entry(fc->background.next, | |
199 | struct fuse_req, bg_entry)); | |
200 | ||
d8a5ba45 | 201 | spin_lock(&fuse_lock); |
1e9a4ed9 | 202 | fc->mounted = 0; |
d8a5ba45 | 203 | fc->user_id = 0; |
87729a55 | 204 | fc->group_id = 0; |
1e9a4ed9 | 205 | fc->flags = 0; |
334f485d MS |
206 | /* Flush all readers on this fs */ |
207 | wake_up_all(&fc->waitq); | |
1e9a4ed9 | 208 | up_write(&fc->sbput_sem); |
d8a5ba45 | 209 | fuse_release_conn(fc); |
d8a5ba45 MS |
210 | spin_unlock(&fuse_lock); |
211 | } | |
212 | ||
e5e5558e MS |
213 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
214 | { | |
215 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
216 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 217 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
218 | stbuf->f_blocks = attr->blocks; |
219 | stbuf->f_bfree = attr->bfree; | |
220 | stbuf->f_bavail = attr->bavail; | |
221 | stbuf->f_files = attr->files; | |
222 | stbuf->f_ffree = attr->ffree; | |
223 | stbuf->f_namelen = attr->namelen; | |
224 | /* fsid is left zero */ | |
225 | } | |
226 | ||
227 | static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) | |
228 | { | |
229 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
230 | struct fuse_req *req; | |
231 | struct fuse_statfs_out outarg; | |
232 | int err; | |
233 | ||
234 | req = fuse_get_request(fc); | |
235 | if (!req) | |
7c352bdf | 236 | return -EINTR; |
e5e5558e | 237 | |
de5f1202 | 238 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
239 | req->in.numargs = 0; |
240 | req->in.h.opcode = FUSE_STATFS; | |
241 | req->out.numargs = 1; | |
de5f1202 MS |
242 | req->out.args[0].size = |
243 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
244 | req->out.args[0].value = &outarg; |
245 | request_send(fc, req); | |
246 | err = req->out.h.error; | |
247 | if (!err) | |
248 | convert_fuse_statfs(buf, &outarg.st); | |
249 | fuse_put_request(fc, req); | |
250 | return err; | |
251 | } | |
252 | ||
d8a5ba45 MS |
253 | enum { |
254 | OPT_FD, | |
255 | OPT_ROOTMODE, | |
256 | OPT_USER_ID, | |
87729a55 | 257 | OPT_GROUP_ID, |
d8a5ba45 MS |
258 | OPT_DEFAULT_PERMISSIONS, |
259 | OPT_ALLOW_OTHER, | |
db50b96c | 260 | OPT_MAX_READ, |
d8a5ba45 MS |
261 | OPT_ERR |
262 | }; | |
263 | ||
264 | static match_table_t tokens = { | |
265 | {OPT_FD, "fd=%u"}, | |
266 | {OPT_ROOTMODE, "rootmode=%o"}, | |
267 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 268 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
269 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
270 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 271 | {OPT_MAX_READ, "max_read=%u"}, |
d8a5ba45 MS |
272 | {OPT_ERR, NULL} |
273 | }; | |
274 | ||
275 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) | |
276 | { | |
277 | char *p; | |
278 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 279 | d->max_read = ~0; |
d8a5ba45 MS |
280 | |
281 | while ((p = strsep(&opt, ",")) != NULL) { | |
282 | int token; | |
283 | int value; | |
284 | substring_t args[MAX_OPT_ARGS]; | |
285 | if (!*p) | |
286 | continue; | |
287 | ||
288 | token = match_token(p, tokens, args); | |
289 | switch (token) { | |
290 | case OPT_FD: | |
291 | if (match_int(&args[0], &value)) | |
292 | return 0; | |
293 | d->fd = value; | |
5a533682 | 294 | d->fd_present = 1; |
d8a5ba45 MS |
295 | break; |
296 | ||
297 | case OPT_ROOTMODE: | |
298 | if (match_octal(&args[0], &value)) | |
299 | return 0; | |
300 | d->rootmode = value; | |
5a533682 | 301 | d->rootmode_present = 1; |
d8a5ba45 MS |
302 | break; |
303 | ||
304 | case OPT_USER_ID: | |
305 | if (match_int(&args[0], &value)) | |
306 | return 0; | |
307 | d->user_id = value; | |
5a533682 | 308 | d->user_id_present = 1; |
d8a5ba45 MS |
309 | break; |
310 | ||
87729a55 MS |
311 | case OPT_GROUP_ID: |
312 | if (match_int(&args[0], &value)) | |
313 | return 0; | |
314 | d->group_id = value; | |
5a533682 | 315 | d->group_id_present = 1; |
87729a55 MS |
316 | break; |
317 | ||
1e9a4ed9 MS |
318 | case OPT_DEFAULT_PERMISSIONS: |
319 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
320 | break; | |
321 | ||
322 | case OPT_ALLOW_OTHER: | |
323 | d->flags |= FUSE_ALLOW_OTHER; | |
324 | break; | |
325 | ||
db50b96c MS |
326 | case OPT_MAX_READ: |
327 | if (match_int(&args[0], &value)) | |
328 | return 0; | |
329 | d->max_read = value; | |
330 | break; | |
331 | ||
d8a5ba45 MS |
332 | default: |
333 | return 0; | |
334 | } | |
335 | } | |
5a533682 MS |
336 | |
337 | if (!d->fd_present || !d->rootmode_present || | |
338 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
339 | return 0; |
340 | ||
341 | return 1; | |
342 | } | |
343 | ||
344 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
345 | { | |
346 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
347 | ||
348 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 349 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
350 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
351 | seq_puts(m, ",default_permissions"); | |
352 | if (fc->flags & FUSE_ALLOW_OTHER) | |
353 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
354 | if (fc->max_read != ~0) |
355 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
356 | return 0; |
357 | } | |
358 | ||
334f485d | 359 | static void free_conn(struct fuse_conn *fc) |
d8a5ba45 | 360 | { |
334f485d MS |
361 | while (!list_empty(&fc->unused_list)) { |
362 | struct fuse_req *req; | |
363 | req = list_entry(fc->unused_list.next, struct fuse_req, list); | |
364 | list_del(&req->list); | |
365 | fuse_request_free(req); | |
366 | } | |
d8a5ba45 MS |
367 | kfree(fc); |
368 | } | |
369 | ||
334f485d MS |
370 | /* Must be called with the fuse lock held */ |
371 | void fuse_release_conn(struct fuse_conn *fc) | |
372 | { | |
1e9a4ed9 MS |
373 | fc->count--; |
374 | if (!fc->count) | |
334f485d MS |
375 | free_conn(fc); |
376 | } | |
377 | ||
d8a5ba45 MS |
378 | static struct fuse_conn *new_conn(void) |
379 | { | |
380 | struct fuse_conn *fc; | |
381 | ||
382 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); | |
383 | if (fc != NULL) { | |
334f485d | 384 | int i; |
d8a5ba45 | 385 | memset(fc, 0, sizeof(*fc)); |
334f485d MS |
386 | init_waitqueue_head(&fc->waitq); |
387 | INIT_LIST_HEAD(&fc->pending); | |
388 | INIT_LIST_HEAD(&fc->processing); | |
389 | INIT_LIST_HEAD(&fc->unused_list); | |
1e9a4ed9 | 390 | INIT_LIST_HEAD(&fc->background); |
334f485d | 391 | sema_init(&fc->outstanding_sem, 0); |
1e9a4ed9 | 392 | init_rwsem(&fc->sbput_sem); |
334f485d MS |
393 | for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) { |
394 | struct fuse_req *req = fuse_request_alloc(); | |
395 | if (!req) { | |
396 | free_conn(fc); | |
397 | return NULL; | |
398 | } | |
399 | list_add(&req->list, &fc->unused_list); | |
400 | } | |
d8a5ba45 MS |
401 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
402 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 403 | fc->reqctr = 0; |
d8a5ba45 MS |
404 | } |
405 | return fc; | |
406 | } | |
407 | ||
408 | static struct fuse_conn *get_conn(struct file *file, struct super_block *sb) | |
409 | { | |
410 | struct fuse_conn *fc; | |
411 | ||
334f485d MS |
412 | if (file->f_op != &fuse_dev_operations) |
413 | return ERR_PTR(-EINVAL); | |
d8a5ba45 MS |
414 | fc = new_conn(); |
415 | if (fc == NULL) | |
334f485d | 416 | return ERR_PTR(-ENOMEM); |
d8a5ba45 | 417 | spin_lock(&fuse_lock); |
334f485d MS |
418 | if (file->private_data) { |
419 | free_conn(fc); | |
420 | fc = ERR_PTR(-EINVAL); | |
421 | } else { | |
422 | file->private_data = fc; | |
1e9a4ed9 MS |
423 | *get_fuse_conn_super_p(sb) = fc; |
424 | fc->mounted = 1; | |
425 | fc->connected = 1; | |
426 | fc->count = 2; | |
334f485d | 427 | } |
d8a5ba45 MS |
428 | spin_unlock(&fuse_lock); |
429 | return fc; | |
430 | } | |
431 | ||
432 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) | |
433 | { | |
434 | struct fuse_attr attr; | |
435 | memset(&attr, 0, sizeof(attr)); | |
436 | ||
437 | attr.mode = mode; | |
438 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 439 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
440 | } |
441 | ||
442 | static struct super_operations fuse_super_operations = { | |
443 | .alloc_inode = fuse_alloc_inode, | |
444 | .destroy_inode = fuse_destroy_inode, | |
445 | .read_inode = fuse_read_inode, | |
446 | .clear_inode = fuse_clear_inode, | |
447 | .put_super = fuse_put_super, | |
e5e5558e | 448 | .statfs = fuse_statfs, |
d8a5ba45 MS |
449 | .show_options = fuse_show_options, |
450 | }; | |
451 | ||
d8a5ba45 MS |
452 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
453 | { | |
454 | struct fuse_conn *fc; | |
455 | struct inode *root; | |
456 | struct fuse_mount_data d; | |
457 | struct file *file; | |
458 | int err; | |
459 | ||
460 | if (!parse_fuse_opt((char *) data, &d)) | |
461 | return -EINVAL; | |
462 | ||
463 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
464 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
465 | sb->s_magic = FUSE_SUPER_MAGIC; | |
466 | sb->s_op = &fuse_super_operations; | |
467 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
468 | ||
469 | file = fget(d.fd); | |
470 | if (!file) | |
471 | return -EINVAL; | |
472 | ||
473 | fc = get_conn(file, sb); | |
474 | fput(file); | |
334f485d MS |
475 | if (IS_ERR(fc)) |
476 | return PTR_ERR(fc); | |
d8a5ba45 | 477 | |
1e9a4ed9 | 478 | fc->flags = d.flags; |
d8a5ba45 | 479 | fc->user_id = d.user_id; |
87729a55 | 480 | fc->group_id = d.group_id; |
db50b96c MS |
481 | fc->max_read = d.max_read; |
482 | if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages) | |
483 | fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE; | |
d8a5ba45 | 484 | |
d8a5ba45 MS |
485 | err = -ENOMEM; |
486 | root = get_root_inode(sb, d.rootmode); | |
487 | if (root == NULL) | |
488 | goto err; | |
489 | ||
490 | sb->s_root = d_alloc_root(root); | |
491 | if (!sb->s_root) { | |
492 | iput(root); | |
493 | goto err; | |
494 | } | |
334f485d | 495 | fuse_send_init(fc); |
d8a5ba45 MS |
496 | return 0; |
497 | ||
498 | err: | |
499 | spin_lock(&fuse_lock); | |
d8a5ba45 MS |
500 | fuse_release_conn(fc); |
501 | spin_unlock(&fuse_lock); | |
d8a5ba45 MS |
502 | return err; |
503 | } | |
504 | ||
505 | static struct super_block *fuse_get_sb(struct file_system_type *fs_type, | |
506 | int flags, const char *dev_name, | |
507 | void *raw_data) | |
508 | { | |
509 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); | |
510 | } | |
511 | ||
512 | static struct file_system_type fuse_fs_type = { | |
513 | .owner = THIS_MODULE, | |
514 | .name = "fuse", | |
515 | .get_sb = fuse_get_sb, | |
516 | .kill_sb = kill_anon_super, | |
517 | }; | |
518 | ||
519 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, | |
520 | unsigned long flags) | |
521 | { | |
522 | struct inode * inode = foo; | |
523 | ||
524 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
525 | SLAB_CTOR_CONSTRUCTOR) | |
526 | inode_init_once(inode); | |
527 | } | |
528 | ||
529 | static int __init fuse_fs_init(void) | |
530 | { | |
531 | int err; | |
532 | ||
533 | err = register_filesystem(&fuse_fs_type); | |
534 | if (err) | |
535 | printk("fuse: failed to register filesystem\n"); | |
536 | else { | |
537 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
538 | sizeof(struct fuse_inode), | |
539 | 0, SLAB_HWCACHE_ALIGN, | |
540 | fuse_inode_init_once, NULL); | |
541 | if (!fuse_inode_cachep) { | |
542 | unregister_filesystem(&fuse_fs_type); | |
543 | err = -ENOMEM; | |
544 | } | |
545 | } | |
546 | ||
547 | return err; | |
548 | } | |
549 | ||
550 | static void fuse_fs_cleanup(void) | |
551 | { | |
552 | unregister_filesystem(&fuse_fs_type); | |
553 | kmem_cache_destroy(fuse_inode_cachep); | |
554 | } | |
555 | ||
556 | static int __init fuse_init(void) | |
557 | { | |
558 | int res; | |
559 | ||
560 | printk("fuse init (API version %i.%i)\n", | |
561 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
562 | ||
563 | spin_lock_init(&fuse_lock); | |
564 | res = fuse_fs_init(); | |
565 | if (res) | |
566 | goto err; | |
567 | ||
334f485d MS |
568 | res = fuse_dev_init(); |
569 | if (res) | |
570 | goto err_fs_cleanup; | |
571 | ||
d8a5ba45 MS |
572 | return 0; |
573 | ||
334f485d MS |
574 | err_fs_cleanup: |
575 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
576 | err: |
577 | return res; | |
578 | } | |
579 | ||
580 | static void __exit fuse_exit(void) | |
581 | { | |
582 | printk(KERN_DEBUG "fuse exit\n"); | |
583 | ||
584 | fuse_fs_cleanup(); | |
334f485d | 585 | fuse_dev_cleanup(); |
d8a5ba45 MS |
586 | } |
587 | ||
588 | module_init(fuse_init); | |
589 | module_exit(fuse_exit); |