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> | |
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 | ||
d8a5ba45 | 25 | static kmem_cache_t *fuse_inode_cachep; |
f543f253 MS |
26 | static struct subsystem connections_subsys; |
27 | ||
28 | struct fuse_conn_attr { | |
29 | struct attribute attr; | |
30 | ssize_t (*show)(struct fuse_conn *, char *); | |
31 | ssize_t (*store)(struct fuse_conn *, const char *, size_t); | |
32 | }; | |
d8a5ba45 MS |
33 | |
34 | #define FUSE_SUPER_MAGIC 0x65735546 | |
35 | ||
36 | struct fuse_mount_data { | |
37 | int fd; | |
38 | unsigned rootmode; | |
39 | unsigned user_id; | |
87729a55 | 40 | unsigned group_id; |
5a533682 MS |
41 | unsigned fd_present : 1; |
42 | unsigned rootmode_present : 1; | |
43 | unsigned user_id_present : 1; | |
44 | unsigned group_id_present : 1; | |
1e9a4ed9 | 45 | unsigned flags; |
db50b96c | 46 | unsigned max_read; |
d8a5ba45 MS |
47 | }; |
48 | ||
49 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
50 | { | |
51 | struct inode *inode; | |
52 | struct fuse_inode *fi; | |
53 | ||
54 | inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL); | |
55 | if (!inode) | |
56 | return NULL; | |
57 | ||
58 | fi = get_fuse_inode(inode); | |
59 | fi->i_time = jiffies - 1; | |
60 | fi->nodeid = 0; | |
9e6268db | 61 | fi->nlookup = 0; |
e5e5558e MS |
62 | fi->forget_req = fuse_request_alloc(); |
63 | if (!fi->forget_req) { | |
64 | kmem_cache_free(fuse_inode_cachep, inode); | |
65 | return NULL; | |
66 | } | |
d8a5ba45 MS |
67 | |
68 | return inode; | |
69 | } | |
70 | ||
71 | static void fuse_destroy_inode(struct inode *inode) | |
72 | { | |
e5e5558e MS |
73 | struct fuse_inode *fi = get_fuse_inode(inode); |
74 | if (fi->forget_req) | |
75 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
76 | kmem_cache_free(fuse_inode_cachep, inode); |
77 | } | |
78 | ||
79 | static void fuse_read_inode(struct inode *inode) | |
80 | { | |
81 | /* No op */ | |
82 | } | |
83 | ||
e5e5558e | 84 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
9e6268db | 85 | unsigned long nodeid, u64 nlookup) |
e5e5558e MS |
86 | { |
87 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 88 | inarg->nlookup = nlookup; |
e5e5558e MS |
89 | req->in.h.opcode = FUSE_FORGET; |
90 | req->in.h.nodeid = nodeid; | |
91 | req->in.numargs = 1; | |
92 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
93 | req->in.args[0].value = inarg; | |
94 | request_send_noreply(fc, req); | |
95 | } | |
96 | ||
d8a5ba45 MS |
97 | static void fuse_clear_inode(struct inode *inode) |
98 | { | |
1e9a4ed9 MS |
99 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
100 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 101 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 102 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
103 | fi->forget_req = NULL; |
104 | } | |
d8a5ba45 MS |
105 | } |
106 | ||
107 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) | |
108 | { | |
109 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) | |
110 | invalidate_inode_pages(inode->i_mapping); | |
111 | ||
112 | inode->i_ino = attr->ino; | |
113 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); | |
114 | inode->i_nlink = attr->nlink; | |
115 | inode->i_uid = attr->uid; | |
116 | inode->i_gid = attr->gid; | |
117 | i_size_write(inode, attr->size); | |
118 | inode->i_blksize = PAGE_CACHE_SIZE; | |
119 | inode->i_blocks = attr->blocks; | |
120 | inode->i_atime.tv_sec = attr->atime; | |
121 | inode->i_atime.tv_nsec = attr->atimensec; | |
122 | inode->i_mtime.tv_sec = attr->mtime; | |
123 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
124 | inode->i_ctime.tv_sec = attr->ctime; | |
125 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
126 | } | |
127 | ||
128 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
129 | { | |
130 | inode->i_mode = attr->mode & S_IFMT; | |
131 | i_size_write(inode, attr->size); | |
e5e5558e MS |
132 | if (S_ISREG(inode->i_mode)) { |
133 | fuse_init_common(inode); | |
b6aeaded | 134 | fuse_init_file_inode(inode); |
e5e5558e MS |
135 | } else if (S_ISDIR(inode->i_mode)) |
136 | fuse_init_dir(inode); | |
137 | else if (S_ISLNK(inode->i_mode)) | |
138 | fuse_init_symlink(inode); | |
139 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
140 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
141 | fuse_init_common(inode); | |
142 | init_special_inode(inode, inode->i_mode, | |
143 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
144 | } else |
145 | BUG(); | |
d8a5ba45 MS |
146 | } |
147 | ||
148 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
149 | { | |
150 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
151 | if (get_node_id(inode) == nodeid) | |
152 | return 1; | |
153 | else | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
158 | { | |
159 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
160 | get_fuse_inode(inode)->nodeid = nodeid; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
9e6268db | 165 | int generation, struct fuse_attr *attr) |
d8a5ba45 MS |
166 | { |
167 | struct inode *inode; | |
9e6268db | 168 | struct fuse_inode *fi; |
d8a5ba45 MS |
169 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
170 | int retried = 0; | |
171 | ||
172 | retry: | |
173 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
174 | if (!inode) | |
175 | return NULL; | |
176 | ||
177 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 178 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
179 | inode->i_generation = generation; |
180 | inode->i_data.backing_dev_info = &fc->bdi; | |
181 | fuse_init_inode(inode, attr); | |
182 | unlock_new_inode(inode); | |
183 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
184 | BUG_ON(retried); | |
185 | /* Inode has changed type, any I/O on the old should fail */ | |
186 | make_bad_inode(inode); | |
187 | iput(inode); | |
188 | retried = 1; | |
189 | goto retry; | |
190 | } | |
191 | ||
9e6268db MS |
192 | fi = get_fuse_inode(inode); |
193 | fi->nlookup ++; | |
d8a5ba45 | 194 | fuse_change_attributes(inode, attr); |
d8a5ba45 MS |
195 | return inode; |
196 | } | |
197 | ||
69a53bf2 MS |
198 | static void fuse_umount_begin(struct super_block *sb) |
199 | { | |
200 | fuse_abort_conn(get_fuse_conn_super(sb)); | |
201 | } | |
202 | ||
d8a5ba45 MS |
203 | static void fuse_put_super(struct super_block *sb) |
204 | { | |
205 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
206 | ||
1e9a4ed9 MS |
207 | down_write(&fc->sbput_sem); |
208 | while (!list_empty(&fc->background)) | |
d7133114 MS |
209 | fuse_release_background(fc, |
210 | list_entry(fc->background.next, | |
1e9a4ed9 MS |
211 | struct fuse_req, bg_entry)); |
212 | ||
d7133114 | 213 | spin_lock(&fc->lock); |
1e9a4ed9 | 214 | fc->mounted = 0; |
9ba7cbba | 215 | fc->connected = 0; |
d7133114 | 216 | spin_unlock(&fc->lock); |
f543f253 | 217 | up_write(&fc->sbput_sem); |
334f485d | 218 | /* Flush all readers on this fs */ |
385a17bf | 219 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 220 | wake_up_all(&fc->waitq); |
f543f253 MS |
221 | kobject_del(&fc->kobj); |
222 | kobject_put(&fc->kobj); | |
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 | ||
239 | static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) | |
240 | { | |
241 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
242 | struct fuse_req *req; | |
243 | struct fuse_statfs_out outarg; | |
244 | int err; | |
245 | ||
ce1d5a49 MS |
246 | req = fuse_get_req(fc); |
247 | if (IS_ERR(req)) | |
248 | return PTR_ERR(req); | |
e5e5558e | 249 | |
de5f1202 | 250 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
251 | req->in.numargs = 0; |
252 | req->in.h.opcode = FUSE_STATFS; | |
253 | req->out.numargs = 1; | |
de5f1202 MS |
254 | req->out.args[0].size = |
255 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
256 | req->out.args[0].value = &outarg; |
257 | request_send(fc, req); | |
258 | err = req->out.h.error; | |
259 | if (!err) | |
260 | convert_fuse_statfs(buf, &outarg.st); | |
261 | fuse_put_request(fc, req); | |
262 | return err; | |
263 | } | |
264 | ||
d8a5ba45 MS |
265 | enum { |
266 | OPT_FD, | |
267 | OPT_ROOTMODE, | |
268 | OPT_USER_ID, | |
87729a55 | 269 | OPT_GROUP_ID, |
d8a5ba45 MS |
270 | OPT_DEFAULT_PERMISSIONS, |
271 | OPT_ALLOW_OTHER, | |
db50b96c | 272 | OPT_MAX_READ, |
d8a5ba45 MS |
273 | OPT_ERR |
274 | }; | |
275 | ||
276 | static match_table_t tokens = { | |
277 | {OPT_FD, "fd=%u"}, | |
278 | {OPT_ROOTMODE, "rootmode=%o"}, | |
279 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 280 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
281 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
282 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 283 | {OPT_MAX_READ, "max_read=%u"}, |
d8a5ba45 MS |
284 | {OPT_ERR, NULL} |
285 | }; | |
286 | ||
287 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) | |
288 | { | |
289 | char *p; | |
290 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 291 | d->max_read = ~0; |
d8a5ba45 MS |
292 | |
293 | while ((p = strsep(&opt, ",")) != NULL) { | |
294 | int token; | |
295 | int value; | |
296 | substring_t args[MAX_OPT_ARGS]; | |
297 | if (!*p) | |
298 | continue; | |
299 | ||
300 | token = match_token(p, tokens, args); | |
301 | switch (token) { | |
302 | case OPT_FD: | |
303 | if (match_int(&args[0], &value)) | |
304 | return 0; | |
305 | d->fd = value; | |
5a533682 | 306 | d->fd_present = 1; |
d8a5ba45 MS |
307 | break; |
308 | ||
309 | case OPT_ROOTMODE: | |
310 | if (match_octal(&args[0], &value)) | |
311 | return 0; | |
312 | d->rootmode = value; | |
5a533682 | 313 | d->rootmode_present = 1; |
d8a5ba45 MS |
314 | break; |
315 | ||
316 | case OPT_USER_ID: | |
317 | if (match_int(&args[0], &value)) | |
318 | return 0; | |
319 | d->user_id = value; | |
5a533682 | 320 | d->user_id_present = 1; |
d8a5ba45 MS |
321 | break; |
322 | ||
87729a55 MS |
323 | case OPT_GROUP_ID: |
324 | if (match_int(&args[0], &value)) | |
325 | return 0; | |
326 | d->group_id = value; | |
5a533682 | 327 | d->group_id_present = 1; |
87729a55 MS |
328 | break; |
329 | ||
1e9a4ed9 MS |
330 | case OPT_DEFAULT_PERMISSIONS: |
331 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
332 | break; | |
333 | ||
334 | case OPT_ALLOW_OTHER: | |
335 | d->flags |= FUSE_ALLOW_OTHER; | |
336 | break; | |
337 | ||
db50b96c MS |
338 | case OPT_MAX_READ: |
339 | if (match_int(&args[0], &value)) | |
340 | return 0; | |
341 | d->max_read = value; | |
342 | break; | |
343 | ||
d8a5ba45 MS |
344 | default: |
345 | return 0; | |
346 | } | |
347 | } | |
5a533682 MS |
348 | |
349 | if (!d->fd_present || !d->rootmode_present || | |
350 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
351 | return 0; |
352 | ||
353 | return 1; | |
354 | } | |
355 | ||
356 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
357 | { | |
358 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
359 | ||
360 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 361 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
362 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
363 | seq_puts(m, ",default_permissions"); | |
364 | if (fc->flags & FUSE_ALLOW_OTHER) | |
365 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
366 | if (fc->max_read != ~0) |
367 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
368 | return 0; |
369 | } | |
370 | ||
f543f253 | 371 | static void fuse_conn_release(struct kobject *kobj) |
d8a5ba45 | 372 | { |
ce1d5a49 | 373 | kfree(get_fuse_conn_kobj(kobj)); |
d8a5ba45 MS |
374 | } |
375 | ||
376 | static struct fuse_conn *new_conn(void) | |
377 | { | |
378 | struct fuse_conn *fc; | |
379 | ||
6383bdaa | 380 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 381 | if (fc) { |
d7133114 | 382 | spin_lock_init(&fc->lock); |
334f485d MS |
383 | init_waitqueue_head(&fc->waitq); |
384 | INIT_LIST_HEAD(&fc->pending); | |
385 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 386 | INIT_LIST_HEAD(&fc->io); |
1e9a4ed9 | 387 | INIT_LIST_HEAD(&fc->background); |
1e9a4ed9 | 388 | init_rwsem(&fc->sbput_sem); |
f543f253 MS |
389 | kobj_set_kset_s(fc, connections_subsys); |
390 | kobject_init(&fc->kobj); | |
095da6cb | 391 | atomic_set(&fc->num_waiting, 0); |
d8a5ba45 MS |
392 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
393 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 394 | fc->reqctr = 0; |
d8a5ba45 MS |
395 | } |
396 | return fc; | |
397 | } | |
398 | ||
d8a5ba45 MS |
399 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
400 | { | |
401 | struct fuse_attr attr; | |
402 | memset(&attr, 0, sizeof(attr)); | |
403 | ||
404 | attr.mode = mode; | |
405 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 406 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
407 | } |
408 | ||
409 | static struct super_operations fuse_super_operations = { | |
410 | .alloc_inode = fuse_alloc_inode, | |
411 | .destroy_inode = fuse_destroy_inode, | |
412 | .read_inode = fuse_read_inode, | |
413 | .clear_inode = fuse_clear_inode, | |
414 | .put_super = fuse_put_super, | |
69a53bf2 | 415 | .umount_begin = fuse_umount_begin, |
e5e5558e | 416 | .statfs = fuse_statfs, |
d8a5ba45 MS |
417 | .show_options = fuse_show_options, |
418 | }; | |
419 | ||
9b9a0469 MS |
420 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
421 | { | |
9b9a0469 MS |
422 | struct fuse_init_out *arg = &req->misc.init_out; |
423 | ||
424 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
425 | fc->conn_error = 1; | |
426 | else { | |
9cd68455 MS |
427 | unsigned long ra_pages; |
428 | ||
429 | if (arg->minor >= 6) { | |
430 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
431 | if (arg->flags & FUSE_ASYNC_READ) | |
432 | fc->async_read = 1; | |
433 | } else | |
434 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; | |
435 | ||
436 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
437 | fc->minor = arg->minor; |
438 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
439 | } | |
9b9a0469 MS |
440 | fuse_put_request(fc, req); |
441 | } | |
442 | ||
ce1d5a49 | 443 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 444 | { |
9b9a0469 | 445 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 446 | |
9b9a0469 MS |
447 | arg->major = FUSE_KERNEL_VERSION; |
448 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 MS |
449 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
450 | arg->flags |= FUSE_ASYNC_READ; | |
9b9a0469 MS |
451 | req->in.h.opcode = FUSE_INIT; |
452 | req->in.numargs = 1; | |
453 | req->in.args[0].size = sizeof(*arg); | |
454 | req->in.args[0].value = arg; | |
455 | req->out.numargs = 1; | |
456 | /* Variable length arguement used for backward compatibility | |
457 | with interface version < 7.5. Rest of init_out is zeroed | |
458 | by do_get_request(), so a short reply is not a problem */ | |
459 | req->out.argvar = 1; | |
460 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
461 | req->out.args[0].value = &req->misc.init_out; | |
462 | req->end = process_init_reply; | |
463 | request_send_background(fc, req); | |
464 | } | |
465 | ||
f543f253 MS |
466 | static unsigned long long conn_id(void) |
467 | { | |
0720b315 | 468 | /* BKL is held for ->get_sb() */ |
f543f253 | 469 | static unsigned long long ctr = 1; |
0720b315 | 470 | return ctr++; |
f543f253 MS |
471 | } |
472 | ||
d8a5ba45 MS |
473 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
474 | { | |
475 | struct fuse_conn *fc; | |
476 | struct inode *root; | |
477 | struct fuse_mount_data d; | |
478 | struct file *file; | |
f543f253 | 479 | struct dentry *root_dentry; |
ce1d5a49 | 480 | struct fuse_req *init_req; |
d8a5ba45 MS |
481 | int err; |
482 | ||
483 | if (!parse_fuse_opt((char *) data, &d)) | |
484 | return -EINVAL; | |
485 | ||
486 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
487 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
488 | sb->s_magic = FUSE_SUPER_MAGIC; | |
489 | sb->s_op = &fuse_super_operations; | |
490 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
491 | ||
492 | file = fget(d.fd); | |
493 | if (!file) | |
494 | return -EINVAL; | |
495 | ||
0720b315 MS |
496 | if (file->f_op != &fuse_dev_operations) |
497 | return -EINVAL; | |
498 | ||
499 | /* Setting file->private_data can't race with other mount() | |
500 | instances, since BKL is held for ->get_sb() */ | |
501 | if (file->private_data) | |
502 | return -EINVAL; | |
503 | ||
504 | fc = new_conn(); | |
505 | if (!fc) | |
506 | return -ENOMEM; | |
d8a5ba45 | 507 | |
1e9a4ed9 | 508 | fc->flags = d.flags; |
d8a5ba45 | 509 | fc->user_id = d.user_id; |
87729a55 | 510 | fc->group_id = d.group_id; |
db50b96c | 511 | fc->max_read = d.max_read; |
d8a5ba45 | 512 | |
f543f253 MS |
513 | /* Used by get_root_inode() */ |
514 | sb->s_fs_info = fc; | |
515 | ||
d8a5ba45 MS |
516 | err = -ENOMEM; |
517 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 518 | if (!root) |
d8a5ba45 MS |
519 | goto err; |
520 | ||
f543f253 MS |
521 | root_dentry = d_alloc_root(root); |
522 | if (!root_dentry) { | |
d8a5ba45 MS |
523 | iput(root); |
524 | goto err; | |
525 | } | |
f543f253 | 526 | |
ce1d5a49 MS |
527 | init_req = fuse_request_alloc(); |
528 | if (!init_req) | |
529 | goto err_put_root; | |
530 | ||
f543f253 MS |
531 | err = kobject_set_name(&fc->kobj, "%llu", conn_id()); |
532 | if (err) | |
ce1d5a49 | 533 | goto err_free_req; |
f543f253 MS |
534 | |
535 | err = kobject_add(&fc->kobj); | |
536 | if (err) | |
ce1d5a49 | 537 | goto err_free_req; |
f543f253 MS |
538 | |
539 | sb->s_root = root_dentry; | |
f543f253 MS |
540 | fc->mounted = 1; |
541 | fc->connected = 1; | |
0720b315 MS |
542 | kobject_get(&fc->kobj); |
543 | file->private_data = fc; | |
544 | /* | |
545 | * atomic_dec_and_test() in fput() provides the necessary | |
546 | * memory barrier for file->private_data to be visible on all | |
547 | * CPUs after this | |
548 | */ | |
549 | fput(file); | |
f543f253 | 550 | |
ce1d5a49 | 551 | fuse_send_init(fc, init_req); |
f543f253 | 552 | |
d8a5ba45 MS |
553 | return 0; |
554 | ||
ce1d5a49 MS |
555 | err_free_req: |
556 | fuse_request_free(init_req); | |
f543f253 MS |
557 | err_put_root: |
558 | dput(root_dentry); | |
d8a5ba45 | 559 | err: |
0720b315 | 560 | fput(file); |
f543f253 | 561 | kobject_put(&fc->kobj); |
d8a5ba45 MS |
562 | return err; |
563 | } | |
564 | ||
565 | static struct super_block *fuse_get_sb(struct file_system_type *fs_type, | |
566 | int flags, const char *dev_name, | |
567 | void *raw_data) | |
568 | { | |
569 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); | |
570 | } | |
571 | ||
572 | static struct file_system_type fuse_fs_type = { | |
573 | .owner = THIS_MODULE, | |
574 | .name = "fuse", | |
575 | .get_sb = fuse_get_sb, | |
576 | .kill_sb = kill_anon_super, | |
577 | }; | |
578 | ||
0cd5b885 MS |
579 | static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page) |
580 | { | |
581 | return sprintf(page, "%i\n", atomic_read(&fc->num_waiting)); | |
582 | } | |
583 | ||
69a53bf2 MS |
584 | static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page, |
585 | size_t count) | |
586 | { | |
587 | fuse_abort_conn(fc); | |
588 | return count; | |
589 | } | |
590 | ||
0cd5b885 MS |
591 | static struct fuse_conn_attr fuse_conn_waiting = |
592 | __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL); | |
69a53bf2 MS |
593 | static struct fuse_conn_attr fuse_conn_abort = |
594 | __ATTR(abort, 0600, NULL, fuse_conn_abort_store); | |
0cd5b885 | 595 | |
f543f253 | 596 | static struct attribute *fuse_conn_attrs[] = { |
0cd5b885 | 597 | &fuse_conn_waiting.attr, |
69a53bf2 | 598 | &fuse_conn_abort.attr, |
f543f253 MS |
599 | NULL, |
600 | }; | |
601 | ||
602 | static ssize_t fuse_conn_attr_show(struct kobject *kobj, | |
603 | struct attribute *attr, | |
604 | char *page) | |
605 | { | |
606 | struct fuse_conn_attr *fca = | |
607 | container_of(attr, struct fuse_conn_attr, attr); | |
608 | ||
609 | if (fca->show) | |
610 | return fca->show(get_fuse_conn_kobj(kobj), page); | |
611 | else | |
612 | return -EACCES; | |
613 | } | |
614 | ||
615 | static ssize_t fuse_conn_attr_store(struct kobject *kobj, | |
616 | struct attribute *attr, | |
617 | const char *page, size_t count) | |
618 | { | |
619 | struct fuse_conn_attr *fca = | |
620 | container_of(attr, struct fuse_conn_attr, attr); | |
621 | ||
622 | if (fca->store) | |
623 | return fca->store(get_fuse_conn_kobj(kobj), page, count); | |
624 | else | |
625 | return -EACCES; | |
626 | } | |
627 | ||
628 | static struct sysfs_ops fuse_conn_sysfs_ops = { | |
629 | .show = &fuse_conn_attr_show, | |
630 | .store = &fuse_conn_attr_store, | |
631 | }; | |
632 | ||
633 | static struct kobj_type ktype_fuse_conn = { | |
634 | .release = fuse_conn_release, | |
635 | .sysfs_ops = &fuse_conn_sysfs_ops, | |
636 | .default_attrs = fuse_conn_attrs, | |
637 | }; | |
638 | ||
639 | static decl_subsys(fuse, NULL, NULL); | |
640 | static decl_subsys(connections, &ktype_fuse_conn, NULL); | |
641 | ||
d8a5ba45 MS |
642 | static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
643 | unsigned long flags) | |
644 | { | |
645 | struct inode * inode = foo; | |
646 | ||
647 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
648 | SLAB_CTOR_CONSTRUCTOR) | |
649 | inode_init_once(inode); | |
650 | } | |
651 | ||
652 | static int __init fuse_fs_init(void) | |
653 | { | |
654 | int err; | |
655 | ||
656 | err = register_filesystem(&fuse_fs_type); | |
657 | if (err) | |
658 | printk("fuse: failed to register filesystem\n"); | |
659 | else { | |
660 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
661 | sizeof(struct fuse_inode), | |
662 | 0, SLAB_HWCACHE_ALIGN, | |
663 | fuse_inode_init_once, NULL); | |
664 | if (!fuse_inode_cachep) { | |
665 | unregister_filesystem(&fuse_fs_type); | |
666 | err = -ENOMEM; | |
667 | } | |
668 | } | |
669 | ||
670 | return err; | |
671 | } | |
672 | ||
673 | static void fuse_fs_cleanup(void) | |
674 | { | |
675 | unregister_filesystem(&fuse_fs_type); | |
676 | kmem_cache_destroy(fuse_inode_cachep); | |
677 | } | |
678 | ||
f543f253 MS |
679 | static int fuse_sysfs_init(void) |
680 | { | |
681 | int err; | |
682 | ||
683 | kset_set_kset_s(&fuse_subsys, fs_subsys); | |
684 | err = subsystem_register(&fuse_subsys); | |
685 | if (err) | |
686 | goto out_err; | |
687 | ||
688 | kset_set_kset_s(&connections_subsys, fuse_subsys); | |
689 | err = subsystem_register(&connections_subsys); | |
690 | if (err) | |
691 | goto out_fuse_unregister; | |
692 | ||
693 | return 0; | |
694 | ||
695 | out_fuse_unregister: | |
696 | subsystem_unregister(&fuse_subsys); | |
697 | out_err: | |
698 | return err; | |
699 | } | |
700 | ||
701 | static void fuse_sysfs_cleanup(void) | |
702 | { | |
703 | subsystem_unregister(&connections_subsys); | |
704 | subsystem_unregister(&fuse_subsys); | |
705 | } | |
706 | ||
d8a5ba45 MS |
707 | static int __init fuse_init(void) |
708 | { | |
709 | int res; | |
710 | ||
711 | printk("fuse init (API version %i.%i)\n", | |
712 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
713 | ||
d8a5ba45 MS |
714 | res = fuse_fs_init(); |
715 | if (res) | |
716 | goto err; | |
717 | ||
334f485d MS |
718 | res = fuse_dev_init(); |
719 | if (res) | |
720 | goto err_fs_cleanup; | |
721 | ||
f543f253 MS |
722 | res = fuse_sysfs_init(); |
723 | if (res) | |
724 | goto err_dev_cleanup; | |
725 | ||
d8a5ba45 MS |
726 | return 0; |
727 | ||
f543f253 MS |
728 | err_dev_cleanup: |
729 | fuse_dev_cleanup(); | |
334f485d MS |
730 | err_fs_cleanup: |
731 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
732 | err: |
733 | return res; | |
734 | } | |
735 | ||
736 | static void __exit fuse_exit(void) | |
737 | { | |
738 | printk(KERN_DEBUG "fuse exit\n"); | |
739 | ||
f543f253 | 740 | fuse_sysfs_cleanup(); |
d8a5ba45 | 741 | fuse_fs_cleanup(); |
334f485d | 742 | fuse_dev_cleanup(); |
d8a5ba45 MS |
743 | } |
744 | ||
745 | module_init(fuse_init); | |
746 | module_exit(fuse_exit); |