Commit | Line | Data |
---|---|---|
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; | |
f543f253 MS |
27 | static struct subsystem connections_subsys; |
28 | ||
29 | struct fuse_conn_attr { | |
30 | struct attribute attr; | |
31 | ssize_t (*show)(struct fuse_conn *, char *); | |
32 | ssize_t (*store)(struct fuse_conn *, const char *, size_t); | |
33 | }; | |
d8a5ba45 MS |
34 | |
35 | #define FUSE_SUPER_MAGIC 0x65735546 | |
36 | ||
37 | struct fuse_mount_data { | |
38 | int fd; | |
39 | unsigned rootmode; | |
40 | unsigned user_id; | |
87729a55 | 41 | unsigned group_id; |
5a533682 MS |
42 | unsigned fd_present : 1; |
43 | unsigned rootmode_present : 1; | |
44 | unsigned user_id_present : 1; | |
45 | unsigned group_id_present : 1; | |
1e9a4ed9 | 46 | unsigned flags; |
db50b96c | 47 | unsigned max_read; |
d8a5ba45 MS |
48 | }; |
49 | ||
50 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
51 | { | |
52 | struct inode *inode; | |
53 | struct fuse_inode *fi; | |
54 | ||
55 | inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL); | |
56 | if (!inode) | |
57 | return NULL; | |
58 | ||
59 | fi = get_fuse_inode(inode); | |
60 | fi->i_time = jiffies - 1; | |
61 | fi->nodeid = 0; | |
9e6268db | 62 | fi->nlookup = 0; |
e5e5558e MS |
63 | fi->forget_req = fuse_request_alloc(); |
64 | if (!fi->forget_req) { | |
65 | kmem_cache_free(fuse_inode_cachep, inode); | |
66 | return NULL; | |
67 | } | |
d8a5ba45 MS |
68 | |
69 | return inode; | |
70 | } | |
71 | ||
72 | static void fuse_destroy_inode(struct inode *inode) | |
73 | { | |
e5e5558e MS |
74 | struct fuse_inode *fi = get_fuse_inode(inode); |
75 | if (fi->forget_req) | |
76 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
77 | kmem_cache_free(fuse_inode_cachep, inode); |
78 | } | |
79 | ||
80 | static void fuse_read_inode(struct inode *inode) | |
81 | { | |
82 | /* No op */ | |
83 | } | |
84 | ||
e5e5558e | 85 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
9e6268db | 86 | unsigned long nodeid, u64 nlookup) |
e5e5558e MS |
87 | { |
88 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 89 | inarg->nlookup = nlookup; |
e5e5558e MS |
90 | req->in.h.opcode = FUSE_FORGET; |
91 | req->in.h.nodeid = nodeid; | |
92 | req->in.numargs = 1; | |
93 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
94 | req->in.args[0].value = inarg; | |
95 | request_send_noreply(fc, req); | |
96 | } | |
97 | ||
d8a5ba45 MS |
98 | static void fuse_clear_inode(struct inode *inode) |
99 | { | |
1e9a4ed9 MS |
100 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
101 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 102 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 103 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
104 | fi->forget_req = NULL; |
105 | } | |
d8a5ba45 MS |
106 | } |
107 | ||
108 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) | |
109 | { | |
110 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) | |
111 | invalidate_inode_pages(inode->i_mapping); | |
112 | ||
113 | inode->i_ino = attr->ino; | |
114 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); | |
115 | inode->i_nlink = attr->nlink; | |
116 | inode->i_uid = attr->uid; | |
117 | inode->i_gid = attr->gid; | |
118 | i_size_write(inode, attr->size); | |
119 | inode->i_blksize = PAGE_CACHE_SIZE; | |
120 | inode->i_blocks = attr->blocks; | |
121 | inode->i_atime.tv_sec = attr->atime; | |
122 | inode->i_atime.tv_nsec = attr->atimensec; | |
123 | inode->i_mtime.tv_sec = attr->mtime; | |
124 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
125 | inode->i_ctime.tv_sec = attr->ctime; | |
126 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
127 | } | |
128 | ||
129 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
130 | { | |
131 | inode->i_mode = attr->mode & S_IFMT; | |
132 | i_size_write(inode, attr->size); | |
e5e5558e MS |
133 | if (S_ISREG(inode->i_mode)) { |
134 | fuse_init_common(inode); | |
b6aeaded | 135 | fuse_init_file_inode(inode); |
e5e5558e MS |
136 | } else if (S_ISDIR(inode->i_mode)) |
137 | fuse_init_dir(inode); | |
138 | else if (S_ISLNK(inode->i_mode)) | |
139 | fuse_init_symlink(inode); | |
140 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
141 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
142 | fuse_init_common(inode); | |
143 | init_special_inode(inode, inode->i_mode, | |
144 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
145 | } else |
146 | BUG(); | |
d8a5ba45 MS |
147 | } |
148 | ||
149 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
150 | { | |
151 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
152 | if (get_node_id(inode) == nodeid) | |
153 | return 1; | |
154 | else | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
159 | { | |
160 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
161 | get_fuse_inode(inode)->nodeid = nodeid; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
9e6268db | 166 | int generation, struct fuse_attr *attr) |
d8a5ba45 MS |
167 | { |
168 | struct inode *inode; | |
9e6268db | 169 | struct fuse_inode *fi; |
d8a5ba45 MS |
170 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
171 | int retried = 0; | |
172 | ||
173 | retry: | |
174 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
175 | if (!inode) | |
176 | return NULL; | |
177 | ||
178 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 179 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
180 | inode->i_generation = generation; |
181 | inode->i_data.backing_dev_info = &fc->bdi; | |
182 | fuse_init_inode(inode, attr); | |
183 | unlock_new_inode(inode); | |
184 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
185 | BUG_ON(retried); | |
186 | /* Inode has changed type, any I/O on the old should fail */ | |
187 | make_bad_inode(inode); | |
188 | iput(inode); | |
189 | retried = 1; | |
190 | goto retry; | |
191 | } | |
192 | ||
9e6268db MS |
193 | fi = get_fuse_inode(inode); |
194 | fi->nlookup ++; | |
d8a5ba45 | 195 | fuse_change_attributes(inode, attr); |
d8a5ba45 MS |
196 | return inode; |
197 | } | |
198 | ||
199 | static void fuse_put_super(struct super_block *sb) | |
200 | { | |
201 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
202 | ||
1e9a4ed9 MS |
203 | down_write(&fc->sbput_sem); |
204 | while (!list_empty(&fc->background)) | |
205 | fuse_release_background(list_entry(fc->background.next, | |
206 | struct fuse_req, bg_entry)); | |
207 | ||
d8a5ba45 | 208 | spin_lock(&fuse_lock); |
1e9a4ed9 | 209 | fc->mounted = 0; |
9ba7cbba | 210 | fc->connected = 0; |
f543f253 MS |
211 | spin_unlock(&fuse_lock); |
212 | up_write(&fc->sbput_sem); | |
334f485d MS |
213 | /* Flush all readers on this fs */ |
214 | wake_up_all(&fc->waitq); | |
f543f253 MS |
215 | kobject_del(&fc->kobj); |
216 | kobject_put(&fc->kobj); | |
d8a5ba45 MS |
217 | } |
218 | ||
e5e5558e MS |
219 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
220 | { | |
221 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
222 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 223 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
224 | stbuf->f_blocks = attr->blocks; |
225 | stbuf->f_bfree = attr->bfree; | |
226 | stbuf->f_bavail = attr->bavail; | |
227 | stbuf->f_files = attr->files; | |
228 | stbuf->f_ffree = attr->ffree; | |
229 | stbuf->f_namelen = attr->namelen; | |
230 | /* fsid is left zero */ | |
231 | } | |
232 | ||
233 | static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) | |
234 | { | |
235 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
236 | struct fuse_req *req; | |
237 | struct fuse_statfs_out outarg; | |
238 | int err; | |
239 | ||
240 | req = fuse_get_request(fc); | |
241 | if (!req) | |
7c352bdf | 242 | return -EINTR; |
e5e5558e | 243 | |
de5f1202 | 244 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
245 | req->in.numargs = 0; |
246 | req->in.h.opcode = FUSE_STATFS; | |
247 | req->out.numargs = 1; | |
de5f1202 MS |
248 | req->out.args[0].size = |
249 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
250 | req->out.args[0].value = &outarg; |
251 | request_send(fc, req); | |
252 | err = req->out.h.error; | |
253 | if (!err) | |
254 | convert_fuse_statfs(buf, &outarg.st); | |
255 | fuse_put_request(fc, req); | |
256 | return err; | |
257 | } | |
258 | ||
d8a5ba45 MS |
259 | enum { |
260 | OPT_FD, | |
261 | OPT_ROOTMODE, | |
262 | OPT_USER_ID, | |
87729a55 | 263 | OPT_GROUP_ID, |
d8a5ba45 MS |
264 | OPT_DEFAULT_PERMISSIONS, |
265 | OPT_ALLOW_OTHER, | |
db50b96c | 266 | OPT_MAX_READ, |
d8a5ba45 MS |
267 | OPT_ERR |
268 | }; | |
269 | ||
270 | static match_table_t tokens = { | |
271 | {OPT_FD, "fd=%u"}, | |
272 | {OPT_ROOTMODE, "rootmode=%o"}, | |
273 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 274 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
275 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
276 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 277 | {OPT_MAX_READ, "max_read=%u"}, |
d8a5ba45 MS |
278 | {OPT_ERR, NULL} |
279 | }; | |
280 | ||
281 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) | |
282 | { | |
283 | char *p; | |
284 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 285 | d->max_read = ~0; |
d8a5ba45 MS |
286 | |
287 | while ((p = strsep(&opt, ",")) != NULL) { | |
288 | int token; | |
289 | int value; | |
290 | substring_t args[MAX_OPT_ARGS]; | |
291 | if (!*p) | |
292 | continue; | |
293 | ||
294 | token = match_token(p, tokens, args); | |
295 | switch (token) { | |
296 | case OPT_FD: | |
297 | if (match_int(&args[0], &value)) | |
298 | return 0; | |
299 | d->fd = value; | |
5a533682 | 300 | d->fd_present = 1; |
d8a5ba45 MS |
301 | break; |
302 | ||
303 | case OPT_ROOTMODE: | |
304 | if (match_octal(&args[0], &value)) | |
305 | return 0; | |
306 | d->rootmode = value; | |
5a533682 | 307 | d->rootmode_present = 1; |
d8a5ba45 MS |
308 | break; |
309 | ||
310 | case OPT_USER_ID: | |
311 | if (match_int(&args[0], &value)) | |
312 | return 0; | |
313 | d->user_id = value; | |
5a533682 | 314 | d->user_id_present = 1; |
d8a5ba45 MS |
315 | break; |
316 | ||
87729a55 MS |
317 | case OPT_GROUP_ID: |
318 | if (match_int(&args[0], &value)) | |
319 | return 0; | |
320 | d->group_id = value; | |
5a533682 | 321 | d->group_id_present = 1; |
87729a55 MS |
322 | break; |
323 | ||
1e9a4ed9 MS |
324 | case OPT_DEFAULT_PERMISSIONS: |
325 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
326 | break; | |
327 | ||
328 | case OPT_ALLOW_OTHER: | |
329 | d->flags |= FUSE_ALLOW_OTHER; | |
330 | break; | |
331 | ||
db50b96c MS |
332 | case OPT_MAX_READ: |
333 | if (match_int(&args[0], &value)) | |
334 | return 0; | |
335 | d->max_read = value; | |
336 | break; | |
337 | ||
d8a5ba45 MS |
338 | default: |
339 | return 0; | |
340 | } | |
341 | } | |
5a533682 MS |
342 | |
343 | if (!d->fd_present || !d->rootmode_present || | |
344 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
345 | return 0; |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
350 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
351 | { | |
352 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
353 | ||
354 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 355 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
356 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
357 | seq_puts(m, ",default_permissions"); | |
358 | if (fc->flags & FUSE_ALLOW_OTHER) | |
359 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
360 | if (fc->max_read != ~0) |
361 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
362 | return 0; |
363 | } | |
364 | ||
f543f253 | 365 | static void fuse_conn_release(struct kobject *kobj) |
d8a5ba45 | 366 | { |
f543f253 MS |
367 | struct fuse_conn *fc = get_fuse_conn_kobj(kobj); |
368 | ||
334f485d MS |
369 | while (!list_empty(&fc->unused_list)) { |
370 | struct fuse_req *req; | |
371 | req = list_entry(fc->unused_list.next, struct fuse_req, list); | |
372 | list_del(&req->list); | |
373 | fuse_request_free(req); | |
374 | } | |
d8a5ba45 MS |
375 | kfree(fc); |
376 | } | |
377 | ||
378 | static struct fuse_conn *new_conn(void) | |
379 | { | |
380 | struct fuse_conn *fc; | |
381 | ||
6383bdaa | 382 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 383 | if (fc) { |
334f485d | 384 | int i; |
334f485d MS |
385 | init_waitqueue_head(&fc->waitq); |
386 | INIT_LIST_HEAD(&fc->pending); | |
387 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 388 | INIT_LIST_HEAD(&fc->io); |
334f485d | 389 | INIT_LIST_HEAD(&fc->unused_list); |
1e9a4ed9 | 390 | INIT_LIST_HEAD(&fc->background); |
6383bdaa | 391 | sema_init(&fc->outstanding_sem, 1); /* One for INIT */ |
1e9a4ed9 | 392 | init_rwsem(&fc->sbput_sem); |
f543f253 MS |
393 | kobj_set_kset_s(fc, connections_subsys); |
394 | kobject_init(&fc->kobj); | |
334f485d MS |
395 | for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) { |
396 | struct fuse_req *req = fuse_request_alloc(); | |
397 | if (!req) { | |
f543f253 | 398 | kobject_put(&fc->kobj); |
334f485d MS |
399 | return NULL; |
400 | } | |
401 | list_add(&req->list, &fc->unused_list); | |
402 | } | |
d8a5ba45 MS |
403 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
404 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 405 | fc->reqctr = 0; |
d8a5ba45 MS |
406 | } |
407 | return fc; | |
408 | } | |
409 | ||
410 | static struct fuse_conn *get_conn(struct file *file, struct super_block *sb) | |
411 | { | |
412 | struct fuse_conn *fc; | |
f543f253 | 413 | int err; |
d8a5ba45 | 414 | |
f543f253 | 415 | err = -EINVAL; |
334f485d | 416 | if (file->f_op != &fuse_dev_operations) |
f543f253 MS |
417 | goto out_err; |
418 | ||
419 | err = -ENOMEM; | |
d8a5ba45 | 420 | fc = new_conn(); |
f543f253 MS |
421 | if (!fc) |
422 | goto out_err; | |
423 | ||
d8a5ba45 | 424 | spin_lock(&fuse_lock); |
f543f253 MS |
425 | err = -EINVAL; |
426 | if (file->private_data) | |
427 | goto out_unlock; | |
428 | ||
429 | kobject_get(&fc->kobj); | |
430 | file->private_data = fc; | |
d8a5ba45 MS |
431 | spin_unlock(&fuse_lock); |
432 | return fc; | |
f543f253 MS |
433 | |
434 | out_unlock: | |
435 | spin_unlock(&fuse_lock); | |
436 | kobject_put(&fc->kobj); | |
437 | out_err: | |
438 | return ERR_PTR(err); | |
d8a5ba45 MS |
439 | } |
440 | ||
441 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) | |
442 | { | |
443 | struct fuse_attr attr; | |
444 | memset(&attr, 0, sizeof(attr)); | |
445 | ||
446 | attr.mode = mode; | |
447 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 448 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
449 | } |
450 | ||
451 | static struct super_operations fuse_super_operations = { | |
452 | .alloc_inode = fuse_alloc_inode, | |
453 | .destroy_inode = fuse_destroy_inode, | |
454 | .read_inode = fuse_read_inode, | |
455 | .clear_inode = fuse_clear_inode, | |
456 | .put_super = fuse_put_super, | |
e5e5558e | 457 | .statfs = fuse_statfs, |
d8a5ba45 MS |
458 | .show_options = fuse_show_options, |
459 | }; | |
460 | ||
f543f253 MS |
461 | static unsigned long long conn_id(void) |
462 | { | |
463 | static unsigned long long ctr = 1; | |
464 | unsigned long long val; | |
465 | spin_lock(&fuse_lock); | |
466 | val = ctr++; | |
467 | spin_unlock(&fuse_lock); | |
468 | return val; | |
469 | } | |
470 | ||
d8a5ba45 MS |
471 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
472 | { | |
473 | struct fuse_conn *fc; | |
474 | struct inode *root; | |
475 | struct fuse_mount_data d; | |
476 | struct file *file; | |
f543f253 | 477 | struct dentry *root_dentry; |
d8a5ba45 MS |
478 | int err; |
479 | ||
480 | if (!parse_fuse_opt((char *) data, &d)) | |
481 | return -EINVAL; | |
482 | ||
483 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
484 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
485 | sb->s_magic = FUSE_SUPER_MAGIC; | |
486 | sb->s_op = &fuse_super_operations; | |
487 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
488 | ||
489 | file = fget(d.fd); | |
490 | if (!file) | |
491 | return -EINVAL; | |
492 | ||
493 | fc = get_conn(file, sb); | |
494 | fput(file); | |
334f485d MS |
495 | if (IS_ERR(fc)) |
496 | return PTR_ERR(fc); | |
d8a5ba45 | 497 | |
1e9a4ed9 | 498 | fc->flags = d.flags; |
d8a5ba45 | 499 | fc->user_id = d.user_id; |
87729a55 | 500 | fc->group_id = d.group_id; |
db50b96c MS |
501 | fc->max_read = d.max_read; |
502 | if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages) | |
503 | fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE; | |
d8a5ba45 | 504 | |
f543f253 MS |
505 | /* Used by get_root_inode() */ |
506 | sb->s_fs_info = fc; | |
507 | ||
d8a5ba45 MS |
508 | err = -ENOMEM; |
509 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 510 | if (!root) |
d8a5ba45 MS |
511 | goto err; |
512 | ||
f543f253 MS |
513 | root_dentry = d_alloc_root(root); |
514 | if (!root_dentry) { | |
d8a5ba45 MS |
515 | iput(root); |
516 | goto err; | |
517 | } | |
f543f253 MS |
518 | |
519 | err = kobject_set_name(&fc->kobj, "%llu", conn_id()); | |
520 | if (err) | |
521 | goto err_put_root; | |
522 | ||
523 | err = kobject_add(&fc->kobj); | |
524 | if (err) | |
525 | goto err_put_root; | |
526 | ||
527 | sb->s_root = root_dentry; | |
528 | spin_lock(&fuse_lock); | |
529 | fc->mounted = 1; | |
530 | fc->connected = 1; | |
531 | spin_unlock(&fuse_lock); | |
532 | ||
334f485d | 533 | fuse_send_init(fc); |
f543f253 | 534 | |
d8a5ba45 MS |
535 | return 0; |
536 | ||
f543f253 MS |
537 | err_put_root: |
538 | dput(root_dentry); | |
d8a5ba45 | 539 | err: |
f543f253 | 540 | kobject_put(&fc->kobj); |
d8a5ba45 MS |
541 | return err; |
542 | } | |
543 | ||
544 | static struct super_block *fuse_get_sb(struct file_system_type *fs_type, | |
545 | int flags, const char *dev_name, | |
546 | void *raw_data) | |
547 | { | |
548 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); | |
549 | } | |
550 | ||
551 | static struct file_system_type fuse_fs_type = { | |
552 | .owner = THIS_MODULE, | |
553 | .name = "fuse", | |
554 | .get_sb = fuse_get_sb, | |
555 | .kill_sb = kill_anon_super, | |
556 | }; | |
557 | ||
f543f253 MS |
558 | static struct attribute *fuse_conn_attrs[] = { |
559 | NULL, | |
560 | }; | |
561 | ||
562 | static ssize_t fuse_conn_attr_show(struct kobject *kobj, | |
563 | struct attribute *attr, | |
564 | char *page) | |
565 | { | |
566 | struct fuse_conn_attr *fca = | |
567 | container_of(attr, struct fuse_conn_attr, attr); | |
568 | ||
569 | if (fca->show) | |
570 | return fca->show(get_fuse_conn_kobj(kobj), page); | |
571 | else | |
572 | return -EACCES; | |
573 | } | |
574 | ||
575 | static ssize_t fuse_conn_attr_store(struct kobject *kobj, | |
576 | struct attribute *attr, | |
577 | const char *page, size_t count) | |
578 | { | |
579 | struct fuse_conn_attr *fca = | |
580 | container_of(attr, struct fuse_conn_attr, attr); | |
581 | ||
582 | if (fca->store) | |
583 | return fca->store(get_fuse_conn_kobj(kobj), page, count); | |
584 | else | |
585 | return -EACCES; | |
586 | } | |
587 | ||
588 | static struct sysfs_ops fuse_conn_sysfs_ops = { | |
589 | .show = &fuse_conn_attr_show, | |
590 | .store = &fuse_conn_attr_store, | |
591 | }; | |
592 | ||
593 | static struct kobj_type ktype_fuse_conn = { | |
594 | .release = fuse_conn_release, | |
595 | .sysfs_ops = &fuse_conn_sysfs_ops, | |
596 | .default_attrs = fuse_conn_attrs, | |
597 | }; | |
598 | ||
599 | static decl_subsys(fuse, NULL, NULL); | |
600 | static decl_subsys(connections, &ktype_fuse_conn, NULL); | |
601 | ||
d8a5ba45 MS |
602 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
603 | unsigned long flags) | |
604 | { | |
605 | struct inode * inode = foo; | |
606 | ||
607 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
608 | SLAB_CTOR_CONSTRUCTOR) | |
609 | inode_init_once(inode); | |
610 | } | |
611 | ||
612 | static int __init fuse_fs_init(void) | |
613 | { | |
614 | int err; | |
615 | ||
616 | err = register_filesystem(&fuse_fs_type); | |
617 | if (err) | |
618 | printk("fuse: failed to register filesystem\n"); | |
619 | else { | |
620 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
621 | sizeof(struct fuse_inode), | |
622 | 0, SLAB_HWCACHE_ALIGN, | |
623 | fuse_inode_init_once, NULL); | |
624 | if (!fuse_inode_cachep) { | |
625 | unregister_filesystem(&fuse_fs_type); | |
626 | err = -ENOMEM; | |
627 | } | |
628 | } | |
629 | ||
630 | return err; | |
631 | } | |
632 | ||
633 | static void fuse_fs_cleanup(void) | |
634 | { | |
635 | unregister_filesystem(&fuse_fs_type); | |
636 | kmem_cache_destroy(fuse_inode_cachep); | |
637 | } | |
638 | ||
f543f253 MS |
639 | static int fuse_sysfs_init(void) |
640 | { | |
641 | int err; | |
642 | ||
643 | kset_set_kset_s(&fuse_subsys, fs_subsys); | |
644 | err = subsystem_register(&fuse_subsys); | |
645 | if (err) | |
646 | goto out_err; | |
647 | ||
648 | kset_set_kset_s(&connections_subsys, fuse_subsys); | |
649 | err = subsystem_register(&connections_subsys); | |
650 | if (err) | |
651 | goto out_fuse_unregister; | |
652 | ||
653 | return 0; | |
654 | ||
655 | out_fuse_unregister: | |
656 | subsystem_unregister(&fuse_subsys); | |
657 | out_err: | |
658 | return err; | |
659 | } | |
660 | ||
661 | static void fuse_sysfs_cleanup(void) | |
662 | { | |
663 | subsystem_unregister(&connections_subsys); | |
664 | subsystem_unregister(&fuse_subsys); | |
665 | } | |
666 | ||
d8a5ba45 MS |
667 | static int __init fuse_init(void) |
668 | { | |
669 | int res; | |
670 | ||
671 | printk("fuse init (API version %i.%i)\n", | |
672 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
673 | ||
674 | spin_lock_init(&fuse_lock); | |
675 | res = fuse_fs_init(); | |
676 | if (res) | |
677 | goto err; | |
678 | ||
334f485d MS |
679 | res = fuse_dev_init(); |
680 | if (res) | |
681 | goto err_fs_cleanup; | |
682 | ||
f543f253 MS |
683 | res = fuse_sysfs_init(); |
684 | if (res) | |
685 | goto err_dev_cleanup; | |
686 | ||
d8a5ba45 MS |
687 | return 0; |
688 | ||
f543f253 MS |
689 | err_dev_cleanup: |
690 | fuse_dev_cleanup(); | |
334f485d MS |
691 | err_fs_cleanup: |
692 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
693 | err: |
694 | return res; | |
695 | } | |
696 | ||
697 | static void __exit fuse_exit(void) | |
698 | { | |
699 | printk(KERN_DEBUG "fuse exit\n"); | |
700 | ||
f543f253 | 701 | fuse_sysfs_cleanup(); |
d8a5ba45 | 702 | fuse_fs_cleanup(); |
334f485d | 703 | fuse_dev_cleanup(); |
d8a5ba45 MS |
704 | } |
705 | ||
706 | module_init(fuse_init); | |
707 | module_exit(fuse_exit); |