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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); | |
095da6cb | 400 | atomic_set(&fc->num_waiting, 0); |
334f485d MS |
401 | for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) { |
402 | struct fuse_req *req = fuse_request_alloc(); | |
403 | if (!req) { | |
f543f253 | 404 | kobject_put(&fc->kobj); |
334f485d MS |
405 | return NULL; |
406 | } | |
407 | list_add(&req->list, &fc->unused_list); | |
408 | } | |
d8a5ba45 MS |
409 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
410 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 411 | fc->reqctr = 0; |
d8a5ba45 MS |
412 | } |
413 | return fc; | |
414 | } | |
415 | ||
416 | static struct fuse_conn *get_conn(struct file *file, struct super_block *sb) | |
417 | { | |
418 | struct fuse_conn *fc; | |
f543f253 | 419 | int err; |
d8a5ba45 | 420 | |
f543f253 | 421 | err = -EINVAL; |
334f485d | 422 | if (file->f_op != &fuse_dev_operations) |
f543f253 MS |
423 | goto out_err; |
424 | ||
425 | err = -ENOMEM; | |
d8a5ba45 | 426 | fc = new_conn(); |
f543f253 MS |
427 | if (!fc) |
428 | goto out_err; | |
429 | ||
d8a5ba45 | 430 | spin_lock(&fuse_lock); |
f543f253 MS |
431 | err = -EINVAL; |
432 | if (file->private_data) | |
433 | goto out_unlock; | |
434 | ||
435 | kobject_get(&fc->kobj); | |
436 | file->private_data = fc; | |
d8a5ba45 MS |
437 | spin_unlock(&fuse_lock); |
438 | return fc; | |
f543f253 MS |
439 | |
440 | out_unlock: | |
441 | spin_unlock(&fuse_lock); | |
442 | kobject_put(&fc->kobj); | |
443 | out_err: | |
444 | return ERR_PTR(err); | |
d8a5ba45 MS |
445 | } |
446 | ||
447 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) | |
448 | { | |
449 | struct fuse_attr attr; | |
450 | memset(&attr, 0, sizeof(attr)); | |
451 | ||
452 | attr.mode = mode; | |
453 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 454 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
455 | } |
456 | ||
457 | static struct super_operations fuse_super_operations = { | |
458 | .alloc_inode = fuse_alloc_inode, | |
459 | .destroy_inode = fuse_destroy_inode, | |
460 | .read_inode = fuse_read_inode, | |
461 | .clear_inode = fuse_clear_inode, | |
462 | .put_super = fuse_put_super, | |
69a53bf2 | 463 | .umount_begin = fuse_umount_begin, |
e5e5558e | 464 | .statfs = fuse_statfs, |
d8a5ba45 MS |
465 | .show_options = fuse_show_options, |
466 | }; | |
467 | ||
9b9a0469 MS |
468 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
469 | { | |
470 | int i; | |
471 | struct fuse_init_out *arg = &req->misc.init_out; | |
472 | ||
473 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
474 | fc->conn_error = 1; | |
475 | else { | |
9cd68455 MS |
476 | unsigned long ra_pages; |
477 | ||
478 | if (arg->minor >= 6) { | |
479 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
480 | if (arg->flags & FUSE_ASYNC_READ) | |
481 | fc->async_read = 1; | |
482 | } else | |
483 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; | |
484 | ||
485 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
486 | fc->minor = arg->minor; |
487 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
488 | } | |
489 | ||
490 | /* After INIT reply is received other requests can go | |
491 | out. So do (FUSE_MAX_OUTSTANDING - 1) number of | |
492 | up()s on outstanding_sem. The last up() is done in | |
493 | fuse_putback_request() */ | |
494 | for (i = 1; i < FUSE_MAX_OUTSTANDING; i++) | |
495 | up(&fc->outstanding_sem); | |
496 | ||
497 | fuse_put_request(fc, req); | |
498 | } | |
499 | ||
500 | static void fuse_send_init(struct fuse_conn *fc) | |
501 | { | |
502 | /* This is called from fuse_read_super() so there's guaranteed | |
503 | to be exactly one request available */ | |
504 | struct fuse_req *req = fuse_get_request(fc); | |
505 | struct fuse_init_in *arg = &req->misc.init_in; | |
095da6cb | 506 | |
9b9a0469 MS |
507 | arg->major = FUSE_KERNEL_VERSION; |
508 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 MS |
509 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
510 | arg->flags |= FUSE_ASYNC_READ; | |
9b9a0469 MS |
511 | req->in.h.opcode = FUSE_INIT; |
512 | req->in.numargs = 1; | |
513 | req->in.args[0].size = sizeof(*arg); | |
514 | req->in.args[0].value = arg; | |
515 | req->out.numargs = 1; | |
516 | /* Variable length arguement used for backward compatibility | |
517 | with interface version < 7.5. Rest of init_out is zeroed | |
518 | by do_get_request(), so a short reply is not a problem */ | |
519 | req->out.argvar = 1; | |
520 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
521 | req->out.args[0].value = &req->misc.init_out; | |
522 | req->end = process_init_reply; | |
523 | request_send_background(fc, req); | |
524 | } | |
525 | ||
f543f253 MS |
526 | static unsigned long long conn_id(void) |
527 | { | |
528 | static unsigned long long ctr = 1; | |
529 | unsigned long long val; | |
530 | spin_lock(&fuse_lock); | |
531 | val = ctr++; | |
532 | spin_unlock(&fuse_lock); | |
533 | return val; | |
534 | } | |
535 | ||
d8a5ba45 MS |
536 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
537 | { | |
538 | struct fuse_conn *fc; | |
539 | struct inode *root; | |
540 | struct fuse_mount_data d; | |
541 | struct file *file; | |
f543f253 | 542 | struct dentry *root_dentry; |
d8a5ba45 MS |
543 | int err; |
544 | ||
545 | if (!parse_fuse_opt((char *) data, &d)) | |
546 | return -EINVAL; | |
547 | ||
548 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
549 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
550 | sb->s_magic = FUSE_SUPER_MAGIC; | |
551 | sb->s_op = &fuse_super_operations; | |
552 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
553 | ||
554 | file = fget(d.fd); | |
555 | if (!file) | |
556 | return -EINVAL; | |
557 | ||
558 | fc = get_conn(file, sb); | |
559 | fput(file); | |
334f485d MS |
560 | if (IS_ERR(fc)) |
561 | return PTR_ERR(fc); | |
d8a5ba45 | 562 | |
1e9a4ed9 | 563 | fc->flags = d.flags; |
d8a5ba45 | 564 | fc->user_id = d.user_id; |
87729a55 | 565 | fc->group_id = d.group_id; |
db50b96c | 566 | fc->max_read = d.max_read; |
d8a5ba45 | 567 | |
f543f253 MS |
568 | /* Used by get_root_inode() */ |
569 | sb->s_fs_info = fc; | |
570 | ||
d8a5ba45 MS |
571 | err = -ENOMEM; |
572 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 573 | if (!root) |
d8a5ba45 MS |
574 | goto err; |
575 | ||
f543f253 MS |
576 | root_dentry = d_alloc_root(root); |
577 | if (!root_dentry) { | |
d8a5ba45 MS |
578 | iput(root); |
579 | goto err; | |
580 | } | |
f543f253 MS |
581 | |
582 | err = kobject_set_name(&fc->kobj, "%llu", conn_id()); | |
583 | if (err) | |
584 | goto err_put_root; | |
585 | ||
586 | err = kobject_add(&fc->kobj); | |
587 | if (err) | |
588 | goto err_put_root; | |
589 | ||
590 | sb->s_root = root_dentry; | |
591 | spin_lock(&fuse_lock); | |
592 | fc->mounted = 1; | |
593 | fc->connected = 1; | |
594 | spin_unlock(&fuse_lock); | |
595 | ||
334f485d | 596 | fuse_send_init(fc); |
f543f253 | 597 | |
d8a5ba45 MS |
598 | return 0; |
599 | ||
f543f253 MS |
600 | err_put_root: |
601 | dput(root_dentry); | |
d8a5ba45 | 602 | err: |
f543f253 | 603 | kobject_put(&fc->kobj); |
d8a5ba45 MS |
604 | return err; |
605 | } | |
606 | ||
607 | static struct super_block *fuse_get_sb(struct file_system_type *fs_type, | |
608 | int flags, const char *dev_name, | |
609 | void *raw_data) | |
610 | { | |
611 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); | |
612 | } | |
613 | ||
614 | static struct file_system_type fuse_fs_type = { | |
615 | .owner = THIS_MODULE, | |
616 | .name = "fuse", | |
617 | .get_sb = fuse_get_sb, | |
618 | .kill_sb = kill_anon_super, | |
619 | }; | |
620 | ||
0cd5b885 MS |
621 | static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page) |
622 | { | |
623 | return sprintf(page, "%i\n", atomic_read(&fc->num_waiting)); | |
624 | } | |
625 | ||
69a53bf2 MS |
626 | static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page, |
627 | size_t count) | |
628 | { | |
629 | fuse_abort_conn(fc); | |
630 | return count; | |
631 | } | |
632 | ||
0cd5b885 MS |
633 | static struct fuse_conn_attr fuse_conn_waiting = |
634 | __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL); | |
69a53bf2 MS |
635 | static struct fuse_conn_attr fuse_conn_abort = |
636 | __ATTR(abort, 0600, NULL, fuse_conn_abort_store); | |
0cd5b885 | 637 | |
f543f253 | 638 | static struct attribute *fuse_conn_attrs[] = { |
0cd5b885 | 639 | &fuse_conn_waiting.attr, |
69a53bf2 | 640 | &fuse_conn_abort.attr, |
f543f253 MS |
641 | NULL, |
642 | }; | |
643 | ||
644 | static ssize_t fuse_conn_attr_show(struct kobject *kobj, | |
645 | struct attribute *attr, | |
646 | char *page) | |
647 | { | |
648 | struct fuse_conn_attr *fca = | |
649 | container_of(attr, struct fuse_conn_attr, attr); | |
650 | ||
651 | if (fca->show) | |
652 | return fca->show(get_fuse_conn_kobj(kobj), page); | |
653 | else | |
654 | return -EACCES; | |
655 | } | |
656 | ||
657 | static ssize_t fuse_conn_attr_store(struct kobject *kobj, | |
658 | struct attribute *attr, | |
659 | const char *page, size_t count) | |
660 | { | |
661 | struct fuse_conn_attr *fca = | |
662 | container_of(attr, struct fuse_conn_attr, attr); | |
663 | ||
664 | if (fca->store) | |
665 | return fca->store(get_fuse_conn_kobj(kobj), page, count); | |
666 | else | |
667 | return -EACCES; | |
668 | } | |
669 | ||
670 | static struct sysfs_ops fuse_conn_sysfs_ops = { | |
671 | .show = &fuse_conn_attr_show, | |
672 | .store = &fuse_conn_attr_store, | |
673 | }; | |
674 | ||
675 | static struct kobj_type ktype_fuse_conn = { | |
676 | .release = fuse_conn_release, | |
677 | .sysfs_ops = &fuse_conn_sysfs_ops, | |
678 | .default_attrs = fuse_conn_attrs, | |
679 | }; | |
680 | ||
681 | static decl_subsys(fuse, NULL, NULL); | |
682 | static decl_subsys(connections, &ktype_fuse_conn, NULL); | |
683 | ||
d8a5ba45 MS |
684 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
685 | unsigned long flags) | |
686 | { | |
687 | struct inode * inode = foo; | |
688 | ||
689 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
690 | SLAB_CTOR_CONSTRUCTOR) | |
691 | inode_init_once(inode); | |
692 | } | |
693 | ||
694 | static int __init fuse_fs_init(void) | |
695 | { | |
696 | int err; | |
697 | ||
698 | err = register_filesystem(&fuse_fs_type); | |
699 | if (err) | |
700 | printk("fuse: failed to register filesystem\n"); | |
701 | else { | |
702 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
703 | sizeof(struct fuse_inode), | |
704 | 0, SLAB_HWCACHE_ALIGN, | |
705 | fuse_inode_init_once, NULL); | |
706 | if (!fuse_inode_cachep) { | |
707 | unregister_filesystem(&fuse_fs_type); | |
708 | err = -ENOMEM; | |
709 | } | |
710 | } | |
711 | ||
712 | return err; | |
713 | } | |
714 | ||
715 | static void fuse_fs_cleanup(void) | |
716 | { | |
717 | unregister_filesystem(&fuse_fs_type); | |
718 | kmem_cache_destroy(fuse_inode_cachep); | |
719 | } | |
720 | ||
f543f253 MS |
721 | static int fuse_sysfs_init(void) |
722 | { | |
723 | int err; | |
724 | ||
725 | kset_set_kset_s(&fuse_subsys, fs_subsys); | |
726 | err = subsystem_register(&fuse_subsys); | |
727 | if (err) | |
728 | goto out_err; | |
729 | ||
730 | kset_set_kset_s(&connections_subsys, fuse_subsys); | |
731 | err = subsystem_register(&connections_subsys); | |
732 | if (err) | |
733 | goto out_fuse_unregister; | |
734 | ||
735 | return 0; | |
736 | ||
737 | out_fuse_unregister: | |
738 | subsystem_unregister(&fuse_subsys); | |
739 | out_err: | |
740 | return err; | |
741 | } | |
742 | ||
743 | static void fuse_sysfs_cleanup(void) | |
744 | { | |
745 | subsystem_unregister(&connections_subsys); | |
746 | subsystem_unregister(&fuse_subsys); | |
747 | } | |
748 | ||
d8a5ba45 MS |
749 | static int __init fuse_init(void) |
750 | { | |
751 | int res; | |
752 | ||
753 | printk("fuse init (API version %i.%i)\n", | |
754 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
755 | ||
756 | spin_lock_init(&fuse_lock); | |
757 | res = fuse_fs_init(); | |
758 | if (res) | |
759 | goto err; | |
760 | ||
334f485d MS |
761 | res = fuse_dev_init(); |
762 | if (res) | |
763 | goto err_fs_cleanup; | |
764 | ||
f543f253 MS |
765 | res = fuse_sysfs_init(); |
766 | if (res) | |
767 | goto err_dev_cleanup; | |
768 | ||
d8a5ba45 MS |
769 | return 0; |
770 | ||
f543f253 MS |
771 | err_dev_cleanup: |
772 | fuse_dev_cleanup(); | |
334f485d MS |
773 | err_fs_cleanup: |
774 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
775 | err: |
776 | return res; | |
777 | } | |
778 | ||
779 | static void __exit fuse_exit(void) | |
780 | { | |
781 | printk(KERN_DEBUG "fuse exit\n"); | |
782 | ||
f543f253 | 783 | fuse_sysfs_cleanup(); |
d8a5ba45 | 784 | fuse_fs_cleanup(); |
334f485d | 785 | fuse_dev_cleanup(); |
d8a5ba45 MS |
786 | } |
787 | ||
788 | module_init(fuse_init); | |
789 | module_exit(fuse_exit); |