Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
d7133114 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
d8a5ba45 MS |
17 | #include <linux/parser.h> |
18 | #include <linux/statfs.h> | |
9c8ef561 | 19 | #include <linux/random.h> |
d8a5ba45 MS |
20 | |
21 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
22 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
d8a5ba45 | 25 | static kmem_cache_t *fuse_inode_cachep; |
bafa9654 MS |
26 | struct list_head fuse_conn_list; |
27 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
28 | |
29 | #define FUSE_SUPER_MAGIC 0x65735546 | |
30 | ||
31 | struct fuse_mount_data { | |
32 | int fd; | |
33 | unsigned rootmode; | |
34 | unsigned user_id; | |
87729a55 | 35 | unsigned group_id; |
5a533682 MS |
36 | unsigned fd_present : 1; |
37 | unsigned rootmode_present : 1; | |
38 | unsigned user_id_present : 1; | |
39 | unsigned group_id_present : 1; | |
1e9a4ed9 | 40 | unsigned flags; |
db50b96c | 41 | unsigned max_read; |
d8a5ba45 MS |
42 | }; |
43 | ||
44 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
45 | { | |
46 | struct inode *inode; | |
47 | struct fuse_inode *fi; | |
48 | ||
49 | inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL); | |
50 | if (!inode) | |
51 | return NULL; | |
52 | ||
53 | fi = get_fuse_inode(inode); | |
0a0898cf | 54 | fi->i_time = 0; |
d8a5ba45 | 55 | fi->nodeid = 0; |
9e6268db | 56 | fi->nlookup = 0; |
e5e5558e MS |
57 | fi->forget_req = fuse_request_alloc(); |
58 | if (!fi->forget_req) { | |
59 | kmem_cache_free(fuse_inode_cachep, inode); | |
60 | return NULL; | |
61 | } | |
d8a5ba45 MS |
62 | |
63 | return inode; | |
64 | } | |
65 | ||
66 | static void fuse_destroy_inode(struct inode *inode) | |
67 | { | |
e5e5558e MS |
68 | struct fuse_inode *fi = get_fuse_inode(inode); |
69 | if (fi->forget_req) | |
70 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
71 | kmem_cache_free(fuse_inode_cachep, inode); |
72 | } | |
73 | ||
74 | static void fuse_read_inode(struct inode *inode) | |
75 | { | |
76 | /* No op */ | |
77 | } | |
78 | ||
e5e5558e | 79 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
9e6268db | 80 | unsigned long nodeid, u64 nlookup) |
e5e5558e MS |
81 | { |
82 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 83 | inarg->nlookup = nlookup; |
e5e5558e MS |
84 | req->in.h.opcode = FUSE_FORGET; |
85 | req->in.h.nodeid = nodeid; | |
86 | req->in.numargs = 1; | |
87 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
88 | req->in.args[0].value = inarg; | |
89 | request_send_noreply(fc, req); | |
90 | } | |
91 | ||
d8a5ba45 MS |
92 | static void fuse_clear_inode(struct inode *inode) |
93 | { | |
1e9a4ed9 MS |
94 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
95 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 96 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 97 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
98 | fi->forget_req = NULL; |
99 | } | |
d8a5ba45 MS |
100 | } |
101 | ||
71421259 MS |
102 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
103 | { | |
104 | if (*flags & MS_MANDLOCK) | |
105 | return -EINVAL; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
d8a5ba45 MS |
110 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) |
111 | { | |
112 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) | |
113 | invalidate_inode_pages(inode->i_mapping); | |
114 | ||
115 | inode->i_ino = attr->ino; | |
116 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); | |
117 | inode->i_nlink = attr->nlink; | |
118 | inode->i_uid = attr->uid; | |
119 | inode->i_gid = attr->gid; | |
120 | i_size_write(inode, attr->size); | |
d8a5ba45 MS |
121 | inode->i_blocks = attr->blocks; |
122 | inode->i_atime.tv_sec = attr->atime; | |
123 | inode->i_atime.tv_nsec = attr->atimensec; | |
124 | inode->i_mtime.tv_sec = attr->mtime; | |
125 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
126 | inode->i_ctime.tv_sec = attr->ctime; | |
127 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
128 | } | |
129 | ||
130 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
131 | { | |
132 | inode->i_mode = attr->mode & S_IFMT; | |
133 | i_size_write(inode, attr->size); | |
e5e5558e MS |
134 | if (S_ISREG(inode->i_mode)) { |
135 | fuse_init_common(inode); | |
b6aeaded | 136 | fuse_init_file_inode(inode); |
e5e5558e MS |
137 | } else if (S_ISDIR(inode->i_mode)) |
138 | fuse_init_dir(inode); | |
139 | else if (S_ISLNK(inode->i_mode)) | |
140 | fuse_init_symlink(inode); | |
141 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
142 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
143 | fuse_init_common(inode); | |
144 | init_special_inode(inode, inode->i_mode, | |
145 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
146 | } else |
147 | BUG(); | |
d8a5ba45 MS |
148 | } |
149 | ||
150 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
151 | { | |
152 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
153 | if (get_node_id(inode) == nodeid) | |
154 | return 1; | |
155 | else | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
160 | { | |
161 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
162 | get_fuse_inode(inode)->nodeid = nodeid; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
9e6268db | 167 | int generation, struct fuse_attr *attr) |
d8a5ba45 MS |
168 | { |
169 | struct inode *inode; | |
9e6268db | 170 | struct fuse_inode *fi; |
d8a5ba45 MS |
171 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
172 | int retried = 0; | |
173 | ||
174 | retry: | |
175 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
176 | if (!inode) | |
177 | return NULL; | |
178 | ||
179 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 180 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
181 | inode->i_generation = generation; |
182 | inode->i_data.backing_dev_info = &fc->bdi; | |
183 | fuse_init_inode(inode, attr); | |
184 | unlock_new_inode(inode); | |
185 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
186 | BUG_ON(retried); | |
187 | /* Inode has changed type, any I/O on the old should fail */ | |
188 | make_bad_inode(inode); | |
189 | iput(inode); | |
190 | retried = 1; | |
191 | goto retry; | |
192 | } | |
193 | ||
9e6268db MS |
194 | fi = get_fuse_inode(inode); |
195 | fi->nlookup ++; | |
d8a5ba45 | 196 | fuse_change_attributes(inode, attr); |
d8a5ba45 MS |
197 | return inode; |
198 | } | |
199 | ||
8b512d9a | 200 | static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) |
69a53bf2 | 201 | { |
8b512d9a TM |
202 | if (flags & MNT_FORCE) |
203 | fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); | |
69a53bf2 MS |
204 | } |
205 | ||
d8a5ba45 MS |
206 | static void fuse_put_super(struct super_block *sb) |
207 | { | |
208 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
209 | ||
d7133114 | 210 | spin_lock(&fc->lock); |
9ba7cbba | 211 | fc->connected = 0; |
51eb01e7 | 212 | fc->blocked = 0; |
d7133114 | 213 | spin_unlock(&fc->lock); |
334f485d | 214 | /* Flush all readers on this fs */ |
385a17bf | 215 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 216 | wake_up_all(&fc->waitq); |
51eb01e7 | 217 | wake_up_all(&fc->blocked_waitq); |
bafa9654 MS |
218 | mutex_lock(&fuse_mutex); |
219 | list_del(&fc->entry); | |
220 | fuse_ctl_remove_conn(fc); | |
221 | mutex_unlock(&fuse_mutex); | |
222 | fuse_conn_put(fc); | |
d8a5ba45 MS |
223 | } |
224 | ||
e5e5558e MS |
225 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
226 | { | |
227 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
228 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 229 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
230 | stbuf->f_blocks = attr->blocks; |
231 | stbuf->f_bfree = attr->bfree; | |
232 | stbuf->f_bavail = attr->bavail; | |
233 | stbuf->f_files = attr->files; | |
234 | stbuf->f_ffree = attr->ffree; | |
235 | stbuf->f_namelen = attr->namelen; | |
236 | /* fsid is left zero */ | |
237 | } | |
238 | ||
726c3342 | 239 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 240 | { |
726c3342 | 241 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
242 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
243 | struct fuse_req *req; | |
244 | struct fuse_statfs_out outarg; | |
245 | int err; | |
246 | ||
ce1d5a49 MS |
247 | req = fuse_get_req(fc); |
248 | if (IS_ERR(req)) | |
249 | return PTR_ERR(req); | |
e5e5558e | 250 | |
de5f1202 | 251 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
252 | req->in.numargs = 0; |
253 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 254 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 255 | req->out.numargs = 1; |
de5f1202 MS |
256 | req->out.args[0].size = |
257 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
258 | req->out.args[0].value = &outarg; |
259 | request_send(fc, req); | |
260 | err = req->out.h.error; | |
261 | if (!err) | |
262 | convert_fuse_statfs(buf, &outarg.st); | |
263 | fuse_put_request(fc, req); | |
264 | return err; | |
265 | } | |
266 | ||
d8a5ba45 MS |
267 | enum { |
268 | OPT_FD, | |
269 | OPT_ROOTMODE, | |
270 | OPT_USER_ID, | |
87729a55 | 271 | OPT_GROUP_ID, |
d8a5ba45 MS |
272 | OPT_DEFAULT_PERMISSIONS, |
273 | OPT_ALLOW_OTHER, | |
db50b96c | 274 | OPT_MAX_READ, |
d8a5ba45 MS |
275 | OPT_ERR |
276 | }; | |
277 | ||
278 | static match_table_t tokens = { | |
279 | {OPT_FD, "fd=%u"}, | |
280 | {OPT_ROOTMODE, "rootmode=%o"}, | |
281 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 282 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
283 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
284 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 285 | {OPT_MAX_READ, "max_read=%u"}, |
d8a5ba45 MS |
286 | {OPT_ERR, NULL} |
287 | }; | |
288 | ||
289 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) | |
290 | { | |
291 | char *p; | |
292 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 293 | d->max_read = ~0; |
d8a5ba45 MS |
294 | |
295 | while ((p = strsep(&opt, ",")) != NULL) { | |
296 | int token; | |
297 | int value; | |
298 | substring_t args[MAX_OPT_ARGS]; | |
299 | if (!*p) | |
300 | continue; | |
301 | ||
302 | token = match_token(p, tokens, args); | |
303 | switch (token) { | |
304 | case OPT_FD: | |
305 | if (match_int(&args[0], &value)) | |
306 | return 0; | |
307 | d->fd = value; | |
5a533682 | 308 | d->fd_present = 1; |
d8a5ba45 MS |
309 | break; |
310 | ||
311 | case OPT_ROOTMODE: | |
312 | if (match_octal(&args[0], &value)) | |
313 | return 0; | |
314 | d->rootmode = value; | |
5a533682 | 315 | d->rootmode_present = 1; |
d8a5ba45 MS |
316 | break; |
317 | ||
318 | case OPT_USER_ID: | |
319 | if (match_int(&args[0], &value)) | |
320 | return 0; | |
321 | d->user_id = value; | |
5a533682 | 322 | d->user_id_present = 1; |
d8a5ba45 MS |
323 | break; |
324 | ||
87729a55 MS |
325 | case OPT_GROUP_ID: |
326 | if (match_int(&args[0], &value)) | |
327 | return 0; | |
328 | d->group_id = value; | |
5a533682 | 329 | d->group_id_present = 1; |
87729a55 MS |
330 | break; |
331 | ||
1e9a4ed9 MS |
332 | case OPT_DEFAULT_PERMISSIONS: |
333 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
334 | break; | |
335 | ||
336 | case OPT_ALLOW_OTHER: | |
337 | d->flags |= FUSE_ALLOW_OTHER; | |
338 | break; | |
339 | ||
db50b96c MS |
340 | case OPT_MAX_READ: |
341 | if (match_int(&args[0], &value)) | |
342 | return 0; | |
343 | d->max_read = value; | |
344 | break; | |
345 | ||
d8a5ba45 MS |
346 | default: |
347 | return 0; | |
348 | } | |
349 | } | |
5a533682 MS |
350 | |
351 | if (!d->fd_present || !d->rootmode_present || | |
352 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
353 | return 0; |
354 | ||
355 | return 1; | |
356 | } | |
357 | ||
358 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
359 | { | |
360 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
361 | ||
362 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 363 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
364 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
365 | seq_puts(m, ",default_permissions"); | |
366 | if (fc->flags & FUSE_ALLOW_OTHER) | |
367 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
368 | if (fc->max_read != ~0) |
369 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
370 | return 0; |
371 | } | |
372 | ||
d8a5ba45 MS |
373 | static struct fuse_conn *new_conn(void) |
374 | { | |
375 | struct fuse_conn *fc; | |
376 | ||
6383bdaa | 377 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 378 | if (fc) { |
d7133114 | 379 | spin_lock_init(&fc->lock); |
bafa9654 | 380 | atomic_set(&fc->count, 1); |
334f485d | 381 | init_waitqueue_head(&fc->waitq); |
08a53cdc | 382 | init_waitqueue_head(&fc->blocked_waitq); |
334f485d MS |
383 | INIT_LIST_HEAD(&fc->pending); |
384 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 385 | INIT_LIST_HEAD(&fc->io); |
a4d27e75 | 386 | INIT_LIST_HEAD(&fc->interrupts); |
095da6cb | 387 | atomic_set(&fc->num_waiting, 0); |
d8a5ba45 MS |
388 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
389 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 390 | fc->reqctr = 0; |
08a53cdc | 391 | fc->blocked = 1; |
9c8ef561 | 392 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
d8a5ba45 MS |
393 | } |
394 | return fc; | |
395 | } | |
396 | ||
bafa9654 MS |
397 | void fuse_conn_put(struct fuse_conn *fc) |
398 | { | |
399 | if (atomic_dec_and_test(&fc->count)) | |
400 | kfree(fc); | |
401 | } | |
402 | ||
403 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
404 | { | |
405 | atomic_inc(&fc->count); | |
406 | return fc; | |
407 | } | |
408 | ||
d8a5ba45 MS |
409 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
410 | { | |
411 | struct fuse_attr attr; | |
412 | memset(&attr, 0, sizeof(attr)); | |
413 | ||
414 | attr.mode = mode; | |
415 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 416 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
417 | } |
418 | ||
419 | static struct super_operations fuse_super_operations = { | |
420 | .alloc_inode = fuse_alloc_inode, | |
421 | .destroy_inode = fuse_destroy_inode, | |
422 | .read_inode = fuse_read_inode, | |
423 | .clear_inode = fuse_clear_inode, | |
71421259 | 424 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 425 | .put_super = fuse_put_super, |
69a53bf2 | 426 | .umount_begin = fuse_umount_begin, |
e5e5558e | 427 | .statfs = fuse_statfs, |
d8a5ba45 MS |
428 | .show_options = fuse_show_options, |
429 | }; | |
430 | ||
9b9a0469 MS |
431 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
432 | { | |
9b9a0469 MS |
433 | struct fuse_init_out *arg = &req->misc.init_out; |
434 | ||
435 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
436 | fc->conn_error = 1; | |
437 | else { | |
9cd68455 MS |
438 | unsigned long ra_pages; |
439 | ||
440 | if (arg->minor >= 6) { | |
441 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
442 | if (arg->flags & FUSE_ASYNC_READ) | |
443 | fc->async_read = 1; | |
71421259 MS |
444 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
445 | fc->no_lock = 1; | |
446 | } else { | |
9cd68455 | 447 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
448 | fc->no_lock = 1; |
449 | } | |
9cd68455 MS |
450 | |
451 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
452 | fc->minor = arg->minor; |
453 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
454 | } | |
9b9a0469 | 455 | fuse_put_request(fc, req); |
08a53cdc MS |
456 | fc->blocked = 0; |
457 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
458 | } |
459 | ||
ce1d5a49 | 460 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 461 | { |
9b9a0469 | 462 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 463 | |
9b9a0469 MS |
464 | arg->major = FUSE_KERNEL_VERSION; |
465 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 466 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
71421259 | 467 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS; |
9b9a0469 MS |
468 | req->in.h.opcode = FUSE_INIT; |
469 | req->in.numargs = 1; | |
470 | req->in.args[0].size = sizeof(*arg); | |
471 | req->in.args[0].value = arg; | |
472 | req->out.numargs = 1; | |
473 | /* Variable length arguement used for backward compatibility | |
474 | with interface version < 7.5. Rest of init_out is zeroed | |
475 | by do_get_request(), so a short reply is not a problem */ | |
476 | req->out.argvar = 1; | |
477 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
478 | req->out.args[0].value = &req->misc.init_out; | |
479 | req->end = process_init_reply; | |
480 | request_send_background(fc, req); | |
481 | } | |
482 | ||
bafa9654 | 483 | static u64 conn_id(void) |
f543f253 | 484 | { |
bafa9654 | 485 | static u64 ctr = 1; |
0720b315 | 486 | return ctr++; |
f543f253 MS |
487 | } |
488 | ||
d8a5ba45 MS |
489 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
490 | { | |
491 | struct fuse_conn *fc; | |
492 | struct inode *root; | |
493 | struct fuse_mount_data d; | |
494 | struct file *file; | |
f543f253 | 495 | struct dentry *root_dentry; |
ce1d5a49 | 496 | struct fuse_req *init_req; |
d8a5ba45 MS |
497 | int err; |
498 | ||
71421259 MS |
499 | if (sb->s_flags & MS_MANDLOCK) |
500 | return -EINVAL; | |
501 | ||
d8a5ba45 MS |
502 | if (!parse_fuse_opt((char *) data, &d)) |
503 | return -EINVAL; | |
504 | ||
505 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
506 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
507 | sb->s_magic = FUSE_SUPER_MAGIC; | |
508 | sb->s_op = &fuse_super_operations; | |
509 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
510 | ||
511 | file = fget(d.fd); | |
512 | if (!file) | |
513 | return -EINVAL; | |
514 | ||
0720b315 MS |
515 | if (file->f_op != &fuse_dev_operations) |
516 | return -EINVAL; | |
517 | ||
0720b315 MS |
518 | fc = new_conn(); |
519 | if (!fc) | |
520 | return -ENOMEM; | |
d8a5ba45 | 521 | |
1e9a4ed9 | 522 | fc->flags = d.flags; |
d8a5ba45 | 523 | fc->user_id = d.user_id; |
87729a55 | 524 | fc->group_id = d.group_id; |
db50b96c | 525 | fc->max_read = d.max_read; |
d8a5ba45 | 526 | |
f543f253 MS |
527 | /* Used by get_root_inode() */ |
528 | sb->s_fs_info = fc; | |
529 | ||
d8a5ba45 MS |
530 | err = -ENOMEM; |
531 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 532 | if (!root) |
d8a5ba45 MS |
533 | goto err; |
534 | ||
f543f253 MS |
535 | root_dentry = d_alloc_root(root); |
536 | if (!root_dentry) { | |
d8a5ba45 MS |
537 | iput(root); |
538 | goto err; | |
539 | } | |
f543f253 | 540 | |
ce1d5a49 MS |
541 | init_req = fuse_request_alloc(); |
542 | if (!init_req) | |
543 | goto err_put_root; | |
544 | ||
bafa9654 | 545 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
546 | err = -EINVAL; |
547 | if (file->private_data) | |
bafa9654 | 548 | goto err_unlock; |
8aa09a50 | 549 | |
bafa9654 MS |
550 | fc->id = conn_id(); |
551 | err = fuse_ctl_add_conn(fc); | |
552 | if (err) | |
553 | goto err_unlock; | |
554 | ||
555 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 556 | sb->s_root = root_dentry; |
f543f253 | 557 | fc->connected = 1; |
bafa9654 MS |
558 | file->private_data = fuse_conn_get(fc); |
559 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
560 | /* |
561 | * atomic_dec_and_test() in fput() provides the necessary | |
562 | * memory barrier for file->private_data to be visible on all | |
563 | * CPUs after this | |
564 | */ | |
565 | fput(file); | |
f543f253 | 566 | |
ce1d5a49 | 567 | fuse_send_init(fc, init_req); |
f543f253 | 568 | |
d8a5ba45 MS |
569 | return 0; |
570 | ||
bafa9654 MS |
571 | err_unlock: |
572 | mutex_unlock(&fuse_mutex); | |
ce1d5a49 | 573 | fuse_request_free(init_req); |
f543f253 MS |
574 | err_put_root: |
575 | dput(root_dentry); | |
d8a5ba45 | 576 | err: |
0720b315 | 577 | fput(file); |
bafa9654 | 578 | fuse_conn_put(fc); |
d8a5ba45 MS |
579 | return err; |
580 | } | |
581 | ||
454e2398 DH |
582 | static int fuse_get_sb(struct file_system_type *fs_type, |
583 | int flags, const char *dev_name, | |
584 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 585 | { |
454e2398 | 586 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
587 | } |
588 | ||
589 | static struct file_system_type fuse_fs_type = { | |
590 | .owner = THIS_MODULE, | |
591 | .name = "fuse", | |
592 | .get_sb = fuse_get_sb, | |
593 | .kill_sb = kill_anon_super, | |
594 | }; | |
595 | ||
f543f253 | 596 | static decl_subsys(fuse, NULL, NULL); |
bafa9654 | 597 | static decl_subsys(connections, NULL, NULL); |
f543f253 | 598 | |
d8a5ba45 MS |
599 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
600 | unsigned long flags) | |
601 | { | |
602 | struct inode * inode = foo; | |
603 | ||
604 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
605 | SLAB_CTOR_CONSTRUCTOR) | |
606 | inode_init_once(inode); | |
607 | } | |
608 | ||
609 | static int __init fuse_fs_init(void) | |
610 | { | |
611 | int err; | |
612 | ||
613 | err = register_filesystem(&fuse_fs_type); | |
614 | if (err) | |
615 | printk("fuse: failed to register filesystem\n"); | |
616 | else { | |
617 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
618 | sizeof(struct fuse_inode), | |
619 | 0, SLAB_HWCACHE_ALIGN, | |
620 | fuse_inode_init_once, NULL); | |
621 | if (!fuse_inode_cachep) { | |
622 | unregister_filesystem(&fuse_fs_type); | |
623 | err = -ENOMEM; | |
624 | } | |
625 | } | |
626 | ||
627 | return err; | |
628 | } | |
629 | ||
630 | static void fuse_fs_cleanup(void) | |
631 | { | |
632 | unregister_filesystem(&fuse_fs_type); | |
633 | kmem_cache_destroy(fuse_inode_cachep); | |
634 | } | |
635 | ||
f543f253 MS |
636 | static int fuse_sysfs_init(void) |
637 | { | |
638 | int err; | |
639 | ||
640 | kset_set_kset_s(&fuse_subsys, fs_subsys); | |
641 | err = subsystem_register(&fuse_subsys); | |
642 | if (err) | |
643 | goto out_err; | |
644 | ||
645 | kset_set_kset_s(&connections_subsys, fuse_subsys); | |
646 | err = subsystem_register(&connections_subsys); | |
647 | if (err) | |
648 | goto out_fuse_unregister; | |
649 | ||
650 | return 0; | |
651 | ||
652 | out_fuse_unregister: | |
653 | subsystem_unregister(&fuse_subsys); | |
654 | out_err: | |
655 | return err; | |
656 | } | |
657 | ||
658 | static void fuse_sysfs_cleanup(void) | |
659 | { | |
660 | subsystem_unregister(&connections_subsys); | |
661 | subsystem_unregister(&fuse_subsys); | |
662 | } | |
663 | ||
d8a5ba45 MS |
664 | static int __init fuse_init(void) |
665 | { | |
666 | int res; | |
667 | ||
668 | printk("fuse init (API version %i.%i)\n", | |
669 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
670 | ||
bafa9654 | 671 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
672 | res = fuse_fs_init(); |
673 | if (res) | |
674 | goto err; | |
675 | ||
334f485d MS |
676 | res = fuse_dev_init(); |
677 | if (res) | |
678 | goto err_fs_cleanup; | |
679 | ||
f543f253 MS |
680 | res = fuse_sysfs_init(); |
681 | if (res) | |
682 | goto err_dev_cleanup; | |
683 | ||
bafa9654 MS |
684 | res = fuse_ctl_init(); |
685 | if (res) | |
686 | goto err_sysfs_cleanup; | |
687 | ||
d8a5ba45 MS |
688 | return 0; |
689 | ||
bafa9654 MS |
690 | err_sysfs_cleanup: |
691 | fuse_sysfs_cleanup(); | |
f543f253 MS |
692 | err_dev_cleanup: |
693 | fuse_dev_cleanup(); | |
334f485d MS |
694 | err_fs_cleanup: |
695 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
696 | err: |
697 | return res; | |
698 | } | |
699 | ||
700 | static void __exit fuse_exit(void) | |
701 | { | |
702 | printk(KERN_DEBUG "fuse exit\n"); | |
703 | ||
bafa9654 | 704 | fuse_ctl_cleanup(); |
f543f253 | 705 | fuse_sysfs_cleanup(); |
d8a5ba45 | 706 | fuse_fs_cleanup(); |
334f485d | 707 | fuse_dev_cleanup(); |
d8a5ba45 MS |
708 | } |
709 | ||
710 | module_init(fuse_init); | |
711 | module_exit(fuse_exit); |