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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; | |
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 | ||
69a53bf2 MS |
199 | static void fuse_umount_begin(struct super_block *sb) |
200 | { | |
201 | fuse_abort_conn(get_fuse_conn_super(sb)); | |
202 | } | |
203 | ||
d8a5ba45 MS |
204 | static void fuse_put_super(struct super_block *sb) |
205 | { | |
206 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
207 | ||
1e9a4ed9 MS |
208 | down_write(&fc->sbput_sem); |
209 | while (!list_empty(&fc->background)) | |
210 | fuse_release_background(list_entry(fc->background.next, | |
211 | struct fuse_req, bg_entry)); | |
212 | ||
d8a5ba45 | 213 | spin_lock(&fuse_lock); |
1e9a4ed9 | 214 | fc->mounted = 0; |
9ba7cbba | 215 | fc->connected = 0; |
f543f253 MS |
216 | spin_unlock(&fuse_lock); |
217 | up_write(&fc->sbput_sem); | |
334f485d MS |
218 | /* Flush all readers on this fs */ |
219 | wake_up_all(&fc->waitq); | |
f543f253 MS |
220 | kobject_del(&fc->kobj); |
221 | kobject_put(&fc->kobj); | |
d8a5ba45 MS |
222 | } |
223 | ||
e5e5558e MS |
224 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
225 | { | |
226 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
227 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 228 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
229 | stbuf->f_blocks = attr->blocks; |
230 | stbuf->f_bfree = attr->bfree; | |
231 | stbuf->f_bavail = attr->bavail; | |
232 | stbuf->f_files = attr->files; | |
233 | stbuf->f_ffree = attr->ffree; | |
234 | stbuf->f_namelen = attr->namelen; | |
235 | /* fsid is left zero */ | |
236 | } | |
237 | ||
238 | static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) | |
239 | { | |
240 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
241 | struct fuse_req *req; | |
242 | struct fuse_statfs_out outarg; | |
243 | int err; | |
244 | ||
245 | req = fuse_get_request(fc); | |
246 | if (!req) | |
7c352bdf | 247 | return -EINTR; |
e5e5558e | 248 | |
de5f1202 | 249 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
250 | req->in.numargs = 0; |
251 | req->in.h.opcode = FUSE_STATFS; | |
252 | req->out.numargs = 1; | |
de5f1202 MS |
253 | req->out.args[0].size = |
254 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
255 | req->out.args[0].value = &outarg; |
256 | request_send(fc, req); | |
257 | err = req->out.h.error; | |
258 | if (!err) | |
259 | convert_fuse_statfs(buf, &outarg.st); | |
260 | fuse_put_request(fc, req); | |
261 | return err; | |
262 | } | |
263 | ||
d8a5ba45 MS |
264 | enum { |
265 | OPT_FD, | |
266 | OPT_ROOTMODE, | |
267 | OPT_USER_ID, | |
87729a55 | 268 | OPT_GROUP_ID, |
d8a5ba45 MS |
269 | OPT_DEFAULT_PERMISSIONS, |
270 | OPT_ALLOW_OTHER, | |
db50b96c | 271 | OPT_MAX_READ, |
d8a5ba45 MS |
272 | OPT_ERR |
273 | }; | |
274 | ||
275 | static match_table_t tokens = { | |
276 | {OPT_FD, "fd=%u"}, | |
277 | {OPT_ROOTMODE, "rootmode=%o"}, | |
278 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 279 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
280 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
281 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 282 | {OPT_MAX_READ, "max_read=%u"}, |
d8a5ba45 MS |
283 | {OPT_ERR, NULL} |
284 | }; | |
285 | ||
286 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) | |
287 | { | |
288 | char *p; | |
289 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 290 | d->max_read = ~0; |
d8a5ba45 MS |
291 | |
292 | while ((p = strsep(&opt, ",")) != NULL) { | |
293 | int token; | |
294 | int value; | |
295 | substring_t args[MAX_OPT_ARGS]; | |
296 | if (!*p) | |
297 | continue; | |
298 | ||
299 | token = match_token(p, tokens, args); | |
300 | switch (token) { | |
301 | case OPT_FD: | |
302 | if (match_int(&args[0], &value)) | |
303 | return 0; | |
304 | d->fd = value; | |
5a533682 | 305 | d->fd_present = 1; |
d8a5ba45 MS |
306 | break; |
307 | ||
308 | case OPT_ROOTMODE: | |
309 | if (match_octal(&args[0], &value)) | |
310 | return 0; | |
311 | d->rootmode = value; | |
5a533682 | 312 | d->rootmode_present = 1; |
d8a5ba45 MS |
313 | break; |
314 | ||
315 | case OPT_USER_ID: | |
316 | if (match_int(&args[0], &value)) | |
317 | return 0; | |
318 | d->user_id = value; | |
5a533682 | 319 | d->user_id_present = 1; |
d8a5ba45 MS |
320 | break; |
321 | ||
87729a55 MS |
322 | case OPT_GROUP_ID: |
323 | if (match_int(&args[0], &value)) | |
324 | return 0; | |
325 | d->group_id = value; | |
5a533682 | 326 | d->group_id_present = 1; |
87729a55 MS |
327 | break; |
328 | ||
1e9a4ed9 MS |
329 | case OPT_DEFAULT_PERMISSIONS: |
330 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
331 | break; | |
332 | ||
333 | case OPT_ALLOW_OTHER: | |
334 | d->flags |= FUSE_ALLOW_OTHER; | |
335 | break; | |
336 | ||
db50b96c MS |
337 | case OPT_MAX_READ: |
338 | if (match_int(&args[0], &value)) | |
339 | return 0; | |
340 | d->max_read = value; | |
341 | break; | |
342 | ||
d8a5ba45 MS |
343 | default: |
344 | return 0; | |
345 | } | |
346 | } | |
5a533682 MS |
347 | |
348 | if (!d->fd_present || !d->rootmode_present || | |
349 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
350 | return 0; |
351 | ||
352 | return 1; | |
353 | } | |
354 | ||
355 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
356 | { | |
357 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
358 | ||
359 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 360 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
361 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
362 | seq_puts(m, ",default_permissions"); | |
363 | if (fc->flags & FUSE_ALLOW_OTHER) | |
364 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
365 | if (fc->max_read != ~0) |
366 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
367 | return 0; |
368 | } | |
369 | ||
f543f253 | 370 | static void fuse_conn_release(struct kobject *kobj) |
d8a5ba45 | 371 | { |
f543f253 MS |
372 | struct fuse_conn *fc = get_fuse_conn_kobj(kobj); |
373 | ||
334f485d MS |
374 | while (!list_empty(&fc->unused_list)) { |
375 | struct fuse_req *req; | |
376 | req = list_entry(fc->unused_list.next, struct fuse_req, list); | |
377 | list_del(&req->list); | |
378 | fuse_request_free(req); | |
379 | } | |
d8a5ba45 MS |
380 | kfree(fc); |
381 | } | |
382 | ||
383 | static struct fuse_conn *new_conn(void) | |
384 | { | |
385 | struct fuse_conn *fc; | |
386 | ||
6383bdaa | 387 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 388 | if (fc) { |
334f485d | 389 | int i; |
334f485d MS |
390 | init_waitqueue_head(&fc->waitq); |
391 | INIT_LIST_HEAD(&fc->pending); | |
392 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 393 | INIT_LIST_HEAD(&fc->io); |
334f485d | 394 | INIT_LIST_HEAD(&fc->unused_list); |
1e9a4ed9 | 395 | INIT_LIST_HEAD(&fc->background); |
6383bdaa | 396 | sema_init(&fc->outstanding_sem, 1); /* One for INIT */ |
1e9a4ed9 | 397 | init_rwsem(&fc->sbput_sem); |
f543f253 MS |
398 | kobj_set_kset_s(fc, connections_subsys); |
399 | kobject_init(&fc->kobj); | |
334f485d MS |
400 | for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) { |
401 | struct fuse_req *req = fuse_request_alloc(); | |
402 | if (!req) { | |
f543f253 | 403 | kobject_put(&fc->kobj); |
334f485d MS |
404 | return NULL; |
405 | } | |
406 | list_add(&req->list, &fc->unused_list); | |
407 | } | |
d8a5ba45 MS |
408 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
409 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 410 | fc->reqctr = 0; |
d8a5ba45 MS |
411 | } |
412 | return fc; | |
413 | } | |
414 | ||
415 | static struct fuse_conn *get_conn(struct file *file, struct super_block *sb) | |
416 | { | |
417 | struct fuse_conn *fc; | |
f543f253 | 418 | int err; |
d8a5ba45 | 419 | |
f543f253 | 420 | err = -EINVAL; |
334f485d | 421 | if (file->f_op != &fuse_dev_operations) |
f543f253 MS |
422 | goto out_err; |
423 | ||
424 | err = -ENOMEM; | |
d8a5ba45 | 425 | fc = new_conn(); |
f543f253 MS |
426 | if (!fc) |
427 | goto out_err; | |
428 | ||
d8a5ba45 | 429 | spin_lock(&fuse_lock); |
f543f253 MS |
430 | err = -EINVAL; |
431 | if (file->private_data) | |
432 | goto out_unlock; | |
433 | ||
434 | kobject_get(&fc->kobj); | |
435 | file->private_data = fc; | |
d8a5ba45 MS |
436 | spin_unlock(&fuse_lock); |
437 | return fc; | |
f543f253 MS |
438 | |
439 | out_unlock: | |
440 | spin_unlock(&fuse_lock); | |
441 | kobject_put(&fc->kobj); | |
442 | out_err: | |
443 | return ERR_PTR(err); | |
d8a5ba45 MS |
444 | } |
445 | ||
446 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) | |
447 | { | |
448 | struct fuse_attr attr; | |
449 | memset(&attr, 0, sizeof(attr)); | |
450 | ||
451 | attr.mode = mode; | |
452 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 453 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
454 | } |
455 | ||
456 | static struct super_operations fuse_super_operations = { | |
457 | .alloc_inode = fuse_alloc_inode, | |
458 | .destroy_inode = fuse_destroy_inode, | |
459 | .read_inode = fuse_read_inode, | |
460 | .clear_inode = fuse_clear_inode, | |
461 | .put_super = fuse_put_super, | |
69a53bf2 | 462 | .umount_begin = fuse_umount_begin, |
e5e5558e | 463 | .statfs = fuse_statfs, |
d8a5ba45 MS |
464 | .show_options = fuse_show_options, |
465 | }; | |
466 | ||
f543f253 MS |
467 | static unsigned long long conn_id(void) |
468 | { | |
469 | static unsigned long long ctr = 1; | |
470 | unsigned long long val; | |
471 | spin_lock(&fuse_lock); | |
472 | val = ctr++; | |
473 | spin_unlock(&fuse_lock); | |
474 | return val; | |
475 | } | |
476 | ||
d8a5ba45 MS |
477 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
478 | { | |
479 | struct fuse_conn *fc; | |
480 | struct inode *root; | |
481 | struct fuse_mount_data d; | |
482 | struct file *file; | |
f543f253 | 483 | struct dentry *root_dentry; |
d8a5ba45 MS |
484 | int err; |
485 | ||
486 | if (!parse_fuse_opt((char *) data, &d)) | |
487 | return -EINVAL; | |
488 | ||
489 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
490 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
491 | sb->s_magic = FUSE_SUPER_MAGIC; | |
492 | sb->s_op = &fuse_super_operations; | |
493 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
494 | ||
495 | file = fget(d.fd); | |
496 | if (!file) | |
497 | return -EINVAL; | |
498 | ||
499 | fc = get_conn(file, sb); | |
500 | fput(file); | |
334f485d MS |
501 | if (IS_ERR(fc)) |
502 | return PTR_ERR(fc); | |
d8a5ba45 | 503 | |
1e9a4ed9 | 504 | fc->flags = d.flags; |
d8a5ba45 | 505 | fc->user_id = d.user_id; |
87729a55 | 506 | fc->group_id = d.group_id; |
db50b96c MS |
507 | fc->max_read = d.max_read; |
508 | if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages) | |
509 | fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE; | |
d8a5ba45 | 510 | |
f543f253 MS |
511 | /* Used by get_root_inode() */ |
512 | sb->s_fs_info = fc; | |
513 | ||
d8a5ba45 MS |
514 | err = -ENOMEM; |
515 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 516 | if (!root) |
d8a5ba45 MS |
517 | goto err; |
518 | ||
f543f253 MS |
519 | root_dentry = d_alloc_root(root); |
520 | if (!root_dentry) { | |
d8a5ba45 MS |
521 | iput(root); |
522 | goto err; | |
523 | } | |
f543f253 MS |
524 | |
525 | err = kobject_set_name(&fc->kobj, "%llu", conn_id()); | |
526 | if (err) | |
527 | goto err_put_root; | |
528 | ||
529 | err = kobject_add(&fc->kobj); | |
530 | if (err) | |
531 | goto err_put_root; | |
532 | ||
533 | sb->s_root = root_dentry; | |
534 | spin_lock(&fuse_lock); | |
535 | fc->mounted = 1; | |
536 | fc->connected = 1; | |
537 | spin_unlock(&fuse_lock); | |
538 | ||
334f485d | 539 | fuse_send_init(fc); |
f543f253 | 540 | |
d8a5ba45 MS |
541 | return 0; |
542 | ||
f543f253 MS |
543 | err_put_root: |
544 | dput(root_dentry); | |
d8a5ba45 | 545 | err: |
f543f253 | 546 | kobject_put(&fc->kobj); |
d8a5ba45 MS |
547 | return err; |
548 | } | |
549 | ||
550 | static struct super_block *fuse_get_sb(struct file_system_type *fs_type, | |
551 | int flags, const char *dev_name, | |
552 | void *raw_data) | |
553 | { | |
554 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); | |
555 | } | |
556 | ||
557 | static struct file_system_type fuse_fs_type = { | |
558 | .owner = THIS_MODULE, | |
559 | .name = "fuse", | |
560 | .get_sb = fuse_get_sb, | |
561 | .kill_sb = kill_anon_super, | |
562 | }; | |
563 | ||
0cd5b885 MS |
564 | static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page) |
565 | { | |
566 | return sprintf(page, "%i\n", atomic_read(&fc->num_waiting)); | |
567 | } | |
568 | ||
69a53bf2 MS |
569 | static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page, |
570 | size_t count) | |
571 | { | |
572 | fuse_abort_conn(fc); | |
573 | return count; | |
574 | } | |
575 | ||
0cd5b885 MS |
576 | static struct fuse_conn_attr fuse_conn_waiting = |
577 | __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL); | |
69a53bf2 MS |
578 | static struct fuse_conn_attr fuse_conn_abort = |
579 | __ATTR(abort, 0600, NULL, fuse_conn_abort_store); | |
0cd5b885 | 580 | |
f543f253 | 581 | static struct attribute *fuse_conn_attrs[] = { |
0cd5b885 | 582 | &fuse_conn_waiting.attr, |
69a53bf2 | 583 | &fuse_conn_abort.attr, |
f543f253 MS |
584 | NULL, |
585 | }; | |
586 | ||
587 | static ssize_t fuse_conn_attr_show(struct kobject *kobj, | |
588 | struct attribute *attr, | |
589 | char *page) | |
590 | { | |
591 | struct fuse_conn_attr *fca = | |
592 | container_of(attr, struct fuse_conn_attr, attr); | |
593 | ||
594 | if (fca->show) | |
595 | return fca->show(get_fuse_conn_kobj(kobj), page); | |
596 | else | |
597 | return -EACCES; | |
598 | } | |
599 | ||
600 | static ssize_t fuse_conn_attr_store(struct kobject *kobj, | |
601 | struct attribute *attr, | |
602 | const char *page, size_t count) | |
603 | { | |
604 | struct fuse_conn_attr *fca = | |
605 | container_of(attr, struct fuse_conn_attr, attr); | |
606 | ||
607 | if (fca->store) | |
608 | return fca->store(get_fuse_conn_kobj(kobj), page, count); | |
609 | else | |
610 | return -EACCES; | |
611 | } | |
612 | ||
613 | static struct sysfs_ops fuse_conn_sysfs_ops = { | |
614 | .show = &fuse_conn_attr_show, | |
615 | .store = &fuse_conn_attr_store, | |
616 | }; | |
617 | ||
618 | static struct kobj_type ktype_fuse_conn = { | |
619 | .release = fuse_conn_release, | |
620 | .sysfs_ops = &fuse_conn_sysfs_ops, | |
621 | .default_attrs = fuse_conn_attrs, | |
622 | }; | |
623 | ||
624 | static decl_subsys(fuse, NULL, NULL); | |
625 | static decl_subsys(connections, &ktype_fuse_conn, NULL); | |
626 | ||
d8a5ba45 MS |
627 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
628 | unsigned long flags) | |
629 | { | |
630 | struct inode * inode = foo; | |
631 | ||
632 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
633 | SLAB_CTOR_CONSTRUCTOR) | |
634 | inode_init_once(inode); | |
635 | } | |
636 | ||
637 | static int __init fuse_fs_init(void) | |
638 | { | |
639 | int err; | |
640 | ||
641 | err = register_filesystem(&fuse_fs_type); | |
642 | if (err) | |
643 | printk("fuse: failed to register filesystem\n"); | |
644 | else { | |
645 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
646 | sizeof(struct fuse_inode), | |
647 | 0, SLAB_HWCACHE_ALIGN, | |
648 | fuse_inode_init_once, NULL); | |
649 | if (!fuse_inode_cachep) { | |
650 | unregister_filesystem(&fuse_fs_type); | |
651 | err = -ENOMEM; | |
652 | } | |
653 | } | |
654 | ||
655 | return err; | |
656 | } | |
657 | ||
658 | static void fuse_fs_cleanup(void) | |
659 | { | |
660 | unregister_filesystem(&fuse_fs_type); | |
661 | kmem_cache_destroy(fuse_inode_cachep); | |
662 | } | |
663 | ||
f543f253 MS |
664 | static int fuse_sysfs_init(void) |
665 | { | |
666 | int err; | |
667 | ||
668 | kset_set_kset_s(&fuse_subsys, fs_subsys); | |
669 | err = subsystem_register(&fuse_subsys); | |
670 | if (err) | |
671 | goto out_err; | |
672 | ||
673 | kset_set_kset_s(&connections_subsys, fuse_subsys); | |
674 | err = subsystem_register(&connections_subsys); | |
675 | if (err) | |
676 | goto out_fuse_unregister; | |
677 | ||
678 | return 0; | |
679 | ||
680 | out_fuse_unregister: | |
681 | subsystem_unregister(&fuse_subsys); | |
682 | out_err: | |
683 | return err; | |
684 | } | |
685 | ||
686 | static void fuse_sysfs_cleanup(void) | |
687 | { | |
688 | subsystem_unregister(&connections_subsys); | |
689 | subsystem_unregister(&fuse_subsys); | |
690 | } | |
691 | ||
d8a5ba45 MS |
692 | static int __init fuse_init(void) |
693 | { | |
694 | int res; | |
695 | ||
696 | printk("fuse init (API version %i.%i)\n", | |
697 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
698 | ||
699 | spin_lock_init(&fuse_lock); | |
700 | res = fuse_fs_init(); | |
701 | if (res) | |
702 | goto err; | |
703 | ||
334f485d MS |
704 | res = fuse_dev_init(); |
705 | if (res) | |
706 | goto err_fs_cleanup; | |
707 | ||
f543f253 MS |
708 | res = fuse_sysfs_init(); |
709 | if (res) | |
710 | goto err_dev_cleanup; | |
711 | ||
d8a5ba45 MS |
712 | return 0; |
713 | ||
f543f253 MS |
714 | err_dev_cleanup: |
715 | fuse_dev_cleanup(); | |
334f485d MS |
716 | err_fs_cleanup: |
717 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
718 | err: |
719 | return res; | |
720 | } | |
721 | ||
722 | static void __exit fuse_exit(void) | |
723 | { | |
724 | printk(KERN_DEBUG "fuse exit\n"); | |
725 | ||
f543f253 | 726 | fuse_sysfs_cleanup(); |
d8a5ba45 | 727 | fuse_fs_cleanup(); |
334f485d | 728 | fuse_dev_cleanup(); |
d8a5ba45 MS |
729 | } |
730 | ||
731 | module_init(fuse_init); | |
732 | module_exit(fuse_exit); |