Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 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> |
e8edc6e0 | 20 | #include <linux/sched.h> |
dbd561d2 | 21 | #include <linux/exportfs.h> |
d8a5ba45 MS |
22 | |
23 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
24 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
e18b890b | 27 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
28 | struct list_head fuse_conn_list; |
29 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
30 | |
31 | #define FUSE_SUPER_MAGIC 0x65735546 | |
32 | ||
d1875dba MS |
33 | #define FUSE_DEFAULT_BLKSIZE 512 |
34 | ||
d8a5ba45 MS |
35 | struct fuse_mount_data { |
36 | int fd; | |
37 | unsigned rootmode; | |
38 | unsigned user_id; | |
87729a55 | 39 | unsigned group_id; |
1729a16c MS |
40 | unsigned fd_present:1; |
41 | unsigned rootmode_present:1; | |
42 | unsigned user_id_present:1; | |
43 | unsigned group_id_present:1; | |
1e9a4ed9 | 44 | unsigned flags; |
db50b96c | 45 | unsigned max_read; |
d8091614 | 46 | unsigned blksize; |
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 | ||
e94b1766 | 54 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
55 | if (!inode) |
56 | return NULL; | |
57 | ||
58 | fi = get_fuse_inode(inode); | |
0a0898cf | 59 | fi->i_time = 0; |
d8a5ba45 | 60 | fi->nodeid = 0; |
9e6268db | 61 | fi->nlookup = 0; |
fbee36b9 | 62 | fi->attr_version = 0; |
3be5a52b | 63 | fi->writectr = 0; |
93a8c3cd | 64 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
65 | INIT_LIST_HEAD(&fi->queued_writes); |
66 | INIT_LIST_HEAD(&fi->writepages); | |
67 | init_waitqueue_head(&fi->page_waitq); | |
e5e5558e MS |
68 | fi->forget_req = fuse_request_alloc(); |
69 | if (!fi->forget_req) { | |
70 | kmem_cache_free(fuse_inode_cachep, inode); | |
71 | return NULL; | |
72 | } | |
d8a5ba45 MS |
73 | |
74 | return inode; | |
75 | } | |
76 | ||
77 | static void fuse_destroy_inode(struct inode *inode) | |
78 | { | |
e5e5558e | 79 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 80 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 81 | BUG_ON(!list_empty(&fi->queued_writes)); |
e5e5558e MS |
82 | if (fi->forget_req) |
83 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
84 | kmem_cache_free(fuse_inode_cachep, inode); |
85 | } | |
86 | ||
e5e5558e | 87 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
b48badf0 | 88 | u64 nodeid, u64 nlookup) |
e5e5558e MS |
89 | { |
90 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 91 | inarg->nlookup = nlookup; |
e5e5558e MS |
92 | req->in.h.opcode = FUSE_FORGET; |
93 | req->in.h.nodeid = nodeid; | |
94 | req->in.numargs = 1; | |
95 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
96 | req->in.args[0].value = inarg; | |
b93f858a | 97 | fuse_request_send_noreply(fc, req); |
e5e5558e MS |
98 | } |
99 | ||
d8a5ba45 MS |
100 | static void fuse_clear_inode(struct inode *inode) |
101 | { | |
1e9a4ed9 MS |
102 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
103 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 104 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 105 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
106 | fi->forget_req = NULL; |
107 | } | |
d8a5ba45 MS |
108 | } |
109 | ||
71421259 MS |
110 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
111 | { | |
112 | if (*flags & MS_MANDLOCK) | |
113 | return -EINVAL; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
3be5a52b | 118 | void fuse_truncate(struct address_space *mapping, loff_t offset) |
e00d2c2d MS |
119 | { |
120 | /* See vmtruncate() */ | |
121 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
122 | truncate_inode_pages(mapping, offset); | |
123 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
124 | } | |
125 | ||
3be5a52b MS |
126 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
127 | u64 attr_valid) | |
d8a5ba45 | 128 | { |
9ffbb916 | 129 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 131 | |
1fb69e78 MS |
132 | fi->attr_version = ++fc->attr_version; |
133 | fi->i_time = attr_valid; | |
134 | ||
d8a5ba45 | 135 | inode->i_ino = attr->ino; |
ebc14c4d | 136 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
d8a5ba45 MS |
137 | inode->i_nlink = attr->nlink; |
138 | inode->i_uid = attr->uid; | |
139 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
140 | inode->i_blocks = attr->blocks; |
141 | inode->i_atime.tv_sec = attr->atime; | |
142 | inode->i_atime.tv_nsec = attr->atimensec; | |
143 | inode->i_mtime.tv_sec = attr->mtime; | |
144 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
145 | inode->i_ctime.tv_sec = attr->ctime; | |
146 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 147 | |
0e9663ee MS |
148 | if (attr->blksize != 0) |
149 | inode->i_blkbits = ilog2(attr->blksize); | |
150 | else | |
151 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
152 | ||
ebc14c4d MS |
153 | /* |
154 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
155 | * to check permissions. This prevents failures due to the | |
156 | * check in may_delete(). | |
157 | */ | |
158 | fi->orig_i_mode = inode->i_mode; | |
159 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
160 | inode->i_mode &= ~S_ISVTX; | |
3be5a52b MS |
161 | } |
162 | ||
163 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
164 | u64 attr_valid, u64 attr_version) | |
165 | { | |
166 | struct fuse_conn *fc = get_fuse_conn(inode); | |
167 | struct fuse_inode *fi = get_fuse_inode(inode); | |
168 | loff_t oldsize; | |
169 | ||
170 | spin_lock(&fc->lock); | |
171 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
172 | spin_unlock(&fc->lock); | |
173 | return; | |
174 | } | |
175 | ||
176 | fuse_change_attributes_common(inode, attr, attr_valid); | |
ebc14c4d | 177 | |
e00d2c2d MS |
178 | oldsize = inode->i_size; |
179 | i_size_write(inode, attr->size); | |
180 | spin_unlock(&fc->lock); | |
181 | ||
182 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
183 | if (attr->size < oldsize) | |
184 | fuse_truncate(inode->i_mapping, attr->size); | |
b1009979 | 185 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 186 | } |
d8a5ba45 MS |
187 | } |
188 | ||
189 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
190 | { | |
191 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 192 | inode->i_size = attr->size; |
e5e5558e MS |
193 | if (S_ISREG(inode->i_mode)) { |
194 | fuse_init_common(inode); | |
b6aeaded | 195 | fuse_init_file_inode(inode); |
e5e5558e MS |
196 | } else if (S_ISDIR(inode->i_mode)) |
197 | fuse_init_dir(inode); | |
198 | else if (S_ISLNK(inode->i_mode)) | |
199 | fuse_init_symlink(inode); | |
200 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
201 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
202 | fuse_init_common(inode); | |
203 | init_special_inode(inode, inode->i_mode, | |
204 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
205 | } else |
206 | BUG(); | |
d8a5ba45 MS |
207 | } |
208 | ||
209 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
210 | { | |
b48badf0 | 211 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
212 | if (get_node_id(inode) == nodeid) |
213 | return 1; | |
214 | else | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
219 | { | |
b48badf0 | 220 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
221 | get_fuse_inode(inode)->nodeid = nodeid; |
222 | return 0; | |
223 | } | |
224 | ||
b48badf0 | 225 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
226 | int generation, struct fuse_attr *attr, |
227 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
228 | { |
229 | struct inode *inode; | |
9e6268db | 230 | struct fuse_inode *fi; |
d8a5ba45 | 231 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
232 | |
233 | retry: | |
234 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
235 | if (!inode) | |
236 | return NULL; | |
237 | ||
238 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 239 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
240 | inode->i_generation = generation; |
241 | inode->i_data.backing_dev_info = &fc->bdi; | |
242 | fuse_init_inode(inode, attr); | |
243 | unlock_new_inode(inode); | |
244 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
245 | /* Inode has changed type, any I/O on the old should fail */ |
246 | make_bad_inode(inode); | |
247 | iput(inode); | |
d8a5ba45 MS |
248 | goto retry; |
249 | } | |
250 | ||
9e6268db | 251 | fi = get_fuse_inode(inode); |
8da5ff23 | 252 | spin_lock(&fc->lock); |
1729a16c | 253 | fi->nlookup++; |
8da5ff23 | 254 | spin_unlock(&fc->lock); |
1fb69e78 MS |
255 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
256 | ||
d8a5ba45 MS |
257 | return inode; |
258 | } | |
259 | ||
42faad99 | 260 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 261 | { |
42faad99 | 262 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
263 | } |
264 | ||
0ec7ca41 MS |
265 | static void fuse_send_destroy(struct fuse_conn *fc) |
266 | { | |
267 | struct fuse_req *req = fc->destroy_req; | |
268 | if (req && fc->conn_init) { | |
269 | fc->destroy_req = NULL; | |
270 | req->in.h.opcode = FUSE_DESTROY; | |
271 | req->force = 1; | |
b93f858a | 272 | fuse_request_send(fc, req); |
0ec7ca41 MS |
273 | fuse_put_request(fc, req); |
274 | } | |
275 | } | |
276 | ||
a325f9b9 | 277 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 278 | { |
a325f9b9 TH |
279 | if (fc->bdi_initialized) |
280 | bdi_destroy(&fc->bdi); | |
281 | } | |
d8a5ba45 | 282 | |
08cbf542 | 283 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 284 | { |
d7133114 | 285 | spin_lock(&fc->lock); |
9ba7cbba | 286 | fc->connected = 0; |
51eb01e7 | 287 | fc->blocked = 0; |
d7133114 | 288 | spin_unlock(&fc->lock); |
334f485d | 289 | /* Flush all readers on this fs */ |
385a17bf | 290 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 291 | wake_up_all(&fc->waitq); |
51eb01e7 | 292 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 293 | wake_up_all(&fc->reserved_req_waitq); |
bafa9654 MS |
294 | mutex_lock(&fuse_mutex); |
295 | list_del(&fc->entry); | |
296 | fuse_ctl_remove_conn(fc); | |
297 | mutex_unlock(&fuse_mutex); | |
a325f9b9 TH |
298 | fuse_bdi_destroy(fc); |
299 | } | |
08cbf542 | 300 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
301 | |
302 | static void fuse_put_super(struct super_block *sb) | |
303 | { | |
304 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
305 | ||
306 | fuse_send_destroy(fc); | |
307 | fuse_conn_kill(fc); | |
bafa9654 | 308 | fuse_conn_put(fc); |
d8a5ba45 MS |
309 | } |
310 | ||
e5e5558e MS |
311 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
312 | { | |
313 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
314 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 315 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
316 | stbuf->f_blocks = attr->blocks; |
317 | stbuf->f_bfree = attr->bfree; | |
318 | stbuf->f_bavail = attr->bavail; | |
319 | stbuf->f_files = attr->files; | |
320 | stbuf->f_ffree = attr->ffree; | |
321 | stbuf->f_namelen = attr->namelen; | |
322 | /* fsid is left zero */ | |
323 | } | |
324 | ||
726c3342 | 325 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 326 | { |
726c3342 | 327 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
328 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
329 | struct fuse_req *req; | |
330 | struct fuse_statfs_out outarg; | |
331 | int err; | |
332 | ||
e57ac683 MS |
333 | if (!fuse_allow_task(fc, current)) { |
334 | buf->f_type = FUSE_SUPER_MAGIC; | |
335 | return 0; | |
336 | } | |
337 | ||
ce1d5a49 MS |
338 | req = fuse_get_req(fc); |
339 | if (IS_ERR(req)) | |
340 | return PTR_ERR(req); | |
e5e5558e | 341 | |
de5f1202 | 342 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
343 | req->in.numargs = 0; |
344 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 345 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 346 | req->out.numargs = 1; |
de5f1202 MS |
347 | req->out.args[0].size = |
348 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 349 | req->out.args[0].value = &outarg; |
b93f858a | 350 | fuse_request_send(fc, req); |
e5e5558e MS |
351 | err = req->out.h.error; |
352 | if (!err) | |
353 | convert_fuse_statfs(buf, &outarg.st); | |
354 | fuse_put_request(fc, req); | |
355 | return err; | |
356 | } | |
357 | ||
d8a5ba45 MS |
358 | enum { |
359 | OPT_FD, | |
360 | OPT_ROOTMODE, | |
361 | OPT_USER_ID, | |
87729a55 | 362 | OPT_GROUP_ID, |
d8a5ba45 MS |
363 | OPT_DEFAULT_PERMISSIONS, |
364 | OPT_ALLOW_OTHER, | |
db50b96c | 365 | OPT_MAX_READ, |
d8091614 | 366 | OPT_BLKSIZE, |
d8a5ba45 MS |
367 | OPT_ERR |
368 | }; | |
369 | ||
a447c093 | 370 | static const match_table_t tokens = { |
d8a5ba45 MS |
371 | {OPT_FD, "fd=%u"}, |
372 | {OPT_ROOTMODE, "rootmode=%o"}, | |
373 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 374 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
375 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
376 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 377 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 378 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
379 | {OPT_ERR, NULL} |
380 | }; | |
381 | ||
d8091614 | 382 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
383 | { |
384 | char *p; | |
385 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 386 | d->max_read = ~0; |
d1875dba | 387 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
388 | |
389 | while ((p = strsep(&opt, ",")) != NULL) { | |
390 | int token; | |
391 | int value; | |
392 | substring_t args[MAX_OPT_ARGS]; | |
393 | if (!*p) | |
394 | continue; | |
395 | ||
396 | token = match_token(p, tokens, args); | |
397 | switch (token) { | |
398 | case OPT_FD: | |
399 | if (match_int(&args[0], &value)) | |
400 | return 0; | |
401 | d->fd = value; | |
5a533682 | 402 | d->fd_present = 1; |
d8a5ba45 MS |
403 | break; |
404 | ||
405 | case OPT_ROOTMODE: | |
406 | if (match_octal(&args[0], &value)) | |
407 | return 0; | |
a5bfffac TS |
408 | if (!fuse_valid_type(value)) |
409 | return 0; | |
d8a5ba45 | 410 | d->rootmode = value; |
5a533682 | 411 | d->rootmode_present = 1; |
d8a5ba45 MS |
412 | break; |
413 | ||
414 | case OPT_USER_ID: | |
415 | if (match_int(&args[0], &value)) | |
416 | return 0; | |
417 | d->user_id = value; | |
5a533682 | 418 | d->user_id_present = 1; |
d8a5ba45 MS |
419 | break; |
420 | ||
87729a55 MS |
421 | case OPT_GROUP_ID: |
422 | if (match_int(&args[0], &value)) | |
423 | return 0; | |
424 | d->group_id = value; | |
5a533682 | 425 | d->group_id_present = 1; |
87729a55 MS |
426 | break; |
427 | ||
1e9a4ed9 MS |
428 | case OPT_DEFAULT_PERMISSIONS: |
429 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
430 | break; | |
431 | ||
432 | case OPT_ALLOW_OTHER: | |
433 | d->flags |= FUSE_ALLOW_OTHER; | |
434 | break; | |
435 | ||
db50b96c MS |
436 | case OPT_MAX_READ: |
437 | if (match_int(&args[0], &value)) | |
438 | return 0; | |
439 | d->max_read = value; | |
440 | break; | |
441 | ||
d8091614 MS |
442 | case OPT_BLKSIZE: |
443 | if (!is_bdev || match_int(&args[0], &value)) | |
444 | return 0; | |
445 | d->blksize = value; | |
446 | break; | |
447 | ||
d8a5ba45 MS |
448 | default: |
449 | return 0; | |
450 | } | |
451 | } | |
5a533682 MS |
452 | |
453 | if (!d->fd_present || !d->rootmode_present || | |
454 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
455 | return 0; |
456 | ||
457 | return 1; | |
458 | } | |
459 | ||
460 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
461 | { | |
462 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
463 | ||
464 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 465 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
466 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
467 | seq_puts(m, ",default_permissions"); | |
468 | if (fc->flags & FUSE_ALLOW_OTHER) | |
469 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
470 | if (fc->max_read != ~0) |
471 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d1875dba MS |
472 | if (mnt->mnt_sb->s_bdev && |
473 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
474 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); | |
d8a5ba45 MS |
475 | return 0; |
476 | } | |
477 | ||
a325f9b9 | 478 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 479 | { |
0d179aa5 TH |
480 | memset(fc, 0, sizeof(*fc)); |
481 | spin_lock_init(&fc->lock); | |
482 | mutex_init(&fc->inst_mutex); | |
483 | atomic_set(&fc->count, 1); | |
484 | init_waitqueue_head(&fc->waitq); | |
485 | init_waitqueue_head(&fc->blocked_waitq); | |
486 | init_waitqueue_head(&fc->reserved_req_waitq); | |
487 | INIT_LIST_HEAD(&fc->pending); | |
488 | INIT_LIST_HEAD(&fc->processing); | |
489 | INIT_LIST_HEAD(&fc->io); | |
490 | INIT_LIST_HEAD(&fc->interrupts); | |
491 | INIT_LIST_HEAD(&fc->bg_queue); | |
492 | INIT_LIST_HEAD(&fc->entry); | |
493 | atomic_set(&fc->num_waiting, 0); | |
0d179aa5 TH |
494 | fc->khctr = 0; |
495 | fc->polled_files = RB_ROOT; | |
0d179aa5 TH |
496 | fc->reqctr = 0; |
497 | fc->blocked = 1; | |
498 | fc->attr_version = 1; | |
499 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 500 | } |
0d179aa5 | 501 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 502 | |
bafa9654 MS |
503 | void fuse_conn_put(struct fuse_conn *fc) |
504 | { | |
d2a85164 | 505 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
506 | if (fc->destroy_req) |
507 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 508 | mutex_destroy(&fc->inst_mutex); |
43901aab | 509 | fc->release(fc); |
d2a85164 | 510 | } |
bafa9654 | 511 | } |
08cbf542 | 512 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
513 | |
514 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
515 | { | |
516 | atomic_inc(&fc->count); | |
517 | return fc; | |
518 | } | |
08cbf542 | 519 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 520 | |
b93f858a | 521 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
522 | { |
523 | struct fuse_attr attr; | |
524 | memset(&attr, 0, sizeof(attr)); | |
525 | ||
526 | attr.mode = mode; | |
527 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 528 | attr.nlink = 1; |
1fb69e78 | 529 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
530 | } |
531 | ||
1729a16c | 532 | struct fuse_inode_handle { |
dbd561d2 MS |
533 | u64 nodeid; |
534 | u32 generation; | |
535 | }; | |
536 | ||
537 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
538 | struct fuse_inode_handle *handle) | |
539 | { | |
33670fa2 | 540 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
541 | struct inode *inode; |
542 | struct dentry *entry; | |
543 | int err = -ESTALE; | |
544 | ||
545 | if (handle->nodeid == 0) | |
546 | goto out_err; | |
547 | ||
548 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
549 | if (!inode) { |
550 | struct fuse_entry_out outarg; | |
551 | struct qstr name; | |
552 | ||
553 | if (!fc->export_support) | |
554 | goto out_err; | |
555 | ||
556 | name.len = 1; | |
557 | name.name = "."; | |
558 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
559 | &inode); | |
560 | if (err && err != -ENOENT) | |
561 | goto out_err; | |
562 | if (err || !inode) { | |
563 | err = -ESTALE; | |
564 | goto out_err; | |
565 | } | |
566 | err = -EIO; | |
567 | if (get_node_id(inode) != handle->nodeid) | |
568 | goto out_iput; | |
569 | } | |
dbd561d2 MS |
570 | err = -ESTALE; |
571 | if (inode->i_generation != handle->generation) | |
572 | goto out_iput; | |
573 | ||
44003728 CH |
574 | entry = d_obtain_alias(inode); |
575 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) { | |
dbd561d2 MS |
576 | entry->d_op = &fuse_dentry_operations; |
577 | fuse_invalidate_entry_cache(entry); | |
578 | } | |
579 | ||
580 | return entry; | |
581 | ||
582 | out_iput: | |
583 | iput(inode); | |
584 | out_err: | |
585 | return ERR_PTR(err); | |
586 | } | |
587 | ||
588 | static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, | |
589 | int connectable) | |
590 | { | |
591 | struct inode *inode = dentry->d_inode; | |
592 | bool encode_parent = connectable && !S_ISDIR(inode->i_mode); | |
593 | int len = encode_parent ? 6 : 3; | |
594 | u64 nodeid; | |
595 | u32 generation; | |
596 | ||
597 | if (*max_len < len) | |
598 | return 255; | |
599 | ||
600 | nodeid = get_fuse_inode(inode)->nodeid; | |
601 | generation = inode->i_generation; | |
602 | ||
603 | fh[0] = (u32)(nodeid >> 32); | |
604 | fh[1] = (u32)(nodeid & 0xffffffff); | |
605 | fh[2] = generation; | |
606 | ||
607 | if (encode_parent) { | |
608 | struct inode *parent; | |
609 | ||
610 | spin_lock(&dentry->d_lock); | |
611 | parent = dentry->d_parent->d_inode; | |
612 | nodeid = get_fuse_inode(parent)->nodeid; | |
613 | generation = parent->i_generation; | |
614 | spin_unlock(&dentry->d_lock); | |
615 | ||
616 | fh[3] = (u32)(nodeid >> 32); | |
617 | fh[4] = (u32)(nodeid & 0xffffffff); | |
618 | fh[5] = generation; | |
619 | } | |
620 | ||
621 | *max_len = len; | |
622 | return encode_parent ? 0x82 : 0x81; | |
623 | } | |
624 | ||
625 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
626 | struct fid *fid, int fh_len, int fh_type) | |
627 | { | |
628 | struct fuse_inode_handle handle; | |
629 | ||
630 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
631 | return NULL; | |
632 | ||
633 | handle.nodeid = (u64) fid->raw[0] << 32; | |
634 | handle.nodeid |= (u64) fid->raw[1]; | |
635 | handle.generation = fid->raw[2]; | |
636 | return fuse_get_dentry(sb, &handle); | |
637 | } | |
638 | ||
639 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
640 | struct fid *fid, int fh_len, int fh_type) | |
641 | { | |
642 | struct fuse_inode_handle parent; | |
643 | ||
644 | if (fh_type != 0x82 || fh_len < 6) | |
645 | return NULL; | |
646 | ||
647 | parent.nodeid = (u64) fid->raw[3] << 32; | |
648 | parent.nodeid |= (u64) fid->raw[4]; | |
649 | parent.generation = fid->raw[5]; | |
650 | return fuse_get_dentry(sb, &parent); | |
651 | } | |
652 | ||
33670fa2 MS |
653 | static struct dentry *fuse_get_parent(struct dentry *child) |
654 | { | |
655 | struct inode *child_inode = child->d_inode; | |
656 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
657 | struct inode *inode; | |
658 | struct dentry *parent; | |
659 | struct fuse_entry_out outarg; | |
660 | struct qstr name; | |
661 | int err; | |
662 | ||
663 | if (!fc->export_support) | |
664 | return ERR_PTR(-ESTALE); | |
665 | ||
666 | name.len = 2; | |
667 | name.name = ".."; | |
668 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
669 | &name, &outarg, &inode); | |
44003728 CH |
670 | if (err) { |
671 | if (err == -ENOENT) | |
672 | return ERR_PTR(-ESTALE); | |
33670fa2 | 673 | return ERR_PTR(err); |
33670fa2 | 674 | } |
44003728 CH |
675 | |
676 | parent = d_obtain_alias(inode); | |
677 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) { | |
33670fa2 MS |
678 | parent->d_op = &fuse_dentry_operations; |
679 | fuse_invalidate_entry_cache(parent); | |
680 | } | |
681 | ||
682 | return parent; | |
683 | } | |
dbd561d2 MS |
684 | |
685 | static const struct export_operations fuse_export_operations = { | |
686 | .fh_to_dentry = fuse_fh_to_dentry, | |
687 | .fh_to_parent = fuse_fh_to_parent, | |
688 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 689 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
690 | }; |
691 | ||
ee9b6d61 | 692 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
693 | .alloc_inode = fuse_alloc_inode, |
694 | .destroy_inode = fuse_destroy_inode, | |
d8a5ba45 | 695 | .clear_inode = fuse_clear_inode, |
ead5f0b5 | 696 | .drop_inode = generic_delete_inode, |
71421259 | 697 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 698 | .put_super = fuse_put_super, |
69a53bf2 | 699 | .umount_begin = fuse_umount_begin, |
e5e5558e | 700 | .statfs = fuse_statfs, |
d8a5ba45 MS |
701 | .show_options = fuse_show_options, |
702 | }; | |
703 | ||
9b9a0469 MS |
704 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
705 | { | |
9b9a0469 MS |
706 | struct fuse_init_out *arg = &req->misc.init_out; |
707 | ||
708 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
709 | fc->conn_error = 1; | |
710 | else { | |
9cd68455 MS |
711 | unsigned long ra_pages; |
712 | ||
713 | if (arg->minor >= 6) { | |
714 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
715 | if (arg->flags & FUSE_ASYNC_READ) | |
716 | fc->async_read = 1; | |
71421259 MS |
717 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
718 | fc->no_lock = 1; | |
6ff958ed MS |
719 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
720 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
721 | if (arg->minor >= 9) { |
722 | /* LOOKUP has dependency on proto version */ | |
723 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
724 | fc->export_support = 1; | |
725 | } | |
78bb6cb9 MS |
726 | if (arg->flags & FUSE_BIG_WRITES) |
727 | fc->big_writes = 1; | |
e0a43ddc MS |
728 | if (arg->flags & FUSE_DONT_MASK) |
729 | fc->dont_mask = 1; | |
71421259 | 730 | } else { |
9cd68455 | 731 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
732 | fc->no_lock = 1; |
733 | } | |
9cd68455 MS |
734 | |
735 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
736 | fc->minor = arg->minor; |
737 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 738 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 739 | fc->conn_init = 1; |
9b9a0469 | 740 | } |
08a53cdc MS |
741 | fc->blocked = 0; |
742 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
743 | } |
744 | ||
ce1d5a49 | 745 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 746 | { |
9b9a0469 | 747 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 748 | |
9b9a0469 MS |
749 | arg->major = FUSE_KERNEL_VERSION; |
750 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 751 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 752 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
e0a43ddc | 753 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK; |
9b9a0469 MS |
754 | req->in.h.opcode = FUSE_INIT; |
755 | req->in.numargs = 1; | |
756 | req->in.args[0].size = sizeof(*arg); | |
757 | req->in.args[0].value = arg; | |
758 | req->out.numargs = 1; | |
759 | /* Variable length arguement used for backward compatibility | |
760 | with interface version < 7.5. Rest of init_out is zeroed | |
761 | by do_get_request(), so a short reply is not a problem */ | |
762 | req->out.argvar = 1; | |
763 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
764 | req->out.args[0].value = &req->misc.init_out; | |
765 | req->end = process_init_reply; | |
b93f858a | 766 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
767 | } |
768 | ||
43901aab TH |
769 | static void fuse_free_conn(struct fuse_conn *fc) |
770 | { | |
771 | kfree(fc); | |
772 | } | |
773 | ||
a325f9b9 TH |
774 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
775 | { | |
776 | int err; | |
777 | ||
778 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; | |
779 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
780 | /* fuse does it's own writeback accounting */ | |
781 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
782 | ||
783 | err = bdi_init(&fc->bdi); | |
784 | if (err) | |
785 | return err; | |
786 | ||
787 | fc->bdi_initialized = 1; | |
788 | ||
789 | if (sb->s_bdev) { | |
790 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
791 | MAJOR(fc->dev), MINOR(fc->dev)); | |
792 | } else { | |
793 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
794 | } | |
795 | ||
796 | if (err) | |
797 | return err; | |
798 | ||
799 | /* | |
800 | * For a single fuse filesystem use max 1% of dirty + | |
801 | * writeback threshold. | |
802 | * | |
803 | * This gives about 1M of write buffer for memory maps on a | |
804 | * machine with 1G and 10% dirty_ratio, which should be more | |
805 | * than enough. | |
806 | * | |
807 | * Privileged users can raise it by writing to | |
808 | * | |
809 | * /sys/class/bdi/<bdi>/max_ratio | |
810 | */ | |
811 | bdi_set_max_ratio(&fc->bdi, 1); | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
d8a5ba45 MS |
816 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
817 | { | |
818 | struct fuse_conn *fc; | |
819 | struct inode *root; | |
820 | struct fuse_mount_data d; | |
821 | struct file *file; | |
f543f253 | 822 | struct dentry *root_dentry; |
ce1d5a49 | 823 | struct fuse_req *init_req; |
d8a5ba45 | 824 | int err; |
d8091614 | 825 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 826 | |
c2b8f006 | 827 | err = -EINVAL; |
71421259 | 828 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 829 | goto err; |
71421259 | 830 | |
d8091614 | 831 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 832 | goto err; |
d8a5ba45 | 833 | |
d8091614 | 834 | if (is_bdev) { |
875d95ec | 835 | #ifdef CONFIG_BLOCK |
c2b8f006 | 836 | err = -EINVAL; |
d8091614 | 837 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 838 | goto err; |
875d95ec | 839 | #endif |
d8091614 MS |
840 | } else { |
841 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
842 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
843 | } | |
d8a5ba45 MS |
844 | sb->s_magic = FUSE_SUPER_MAGIC; |
845 | sb->s_op = &fuse_super_operations; | |
846 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
dbd561d2 | 847 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
848 | |
849 | file = fget(d.fd); | |
c2b8f006 | 850 | err = -EINVAL; |
d8a5ba45 | 851 | if (!file) |
c2b8f006 | 852 | goto err; |
d8a5ba45 | 853 | |
c2b8f006 MS |
854 | if (file->f_op != &fuse_dev_operations) |
855 | goto err_fput; | |
0720b315 | 856 | |
0d179aa5 | 857 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
858 | err = -ENOMEM; |
859 | if (!fc) | |
860 | goto err_fput; | |
d8a5ba45 | 861 | |
a325f9b9 TH |
862 | fuse_conn_init(fc); |
863 | ||
864 | fc->dev = sb->s_dev; | |
865 | err = fuse_bdi_init(fc, sb); | |
866 | if (err) | |
867 | goto err_put_conn; | |
0d179aa5 | 868 | |
e0a43ddc MS |
869 | /* Handle umasking inside the fuse code */ |
870 | if (sb->s_flags & MS_POSIXACL) | |
871 | fc->dont_mask = 1; | |
872 | sb->s_flags |= MS_POSIXACL; | |
873 | ||
43901aab | 874 | fc->release = fuse_free_conn; |
1e9a4ed9 | 875 | fc->flags = d.flags; |
d8a5ba45 | 876 | fc->user_id = d.user_id; |
87729a55 | 877 | fc->group_id = d.group_id; |
f948d564 | 878 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 879 | |
f543f253 MS |
880 | /* Used by get_root_inode() */ |
881 | sb->s_fs_info = fc; | |
882 | ||
d8a5ba45 | 883 | err = -ENOMEM; |
b93f858a | 884 | root = fuse_get_root_inode(sb, d.rootmode); |
f543f253 | 885 | if (!root) |
c2b8f006 | 886 | goto err_put_conn; |
d8a5ba45 | 887 | |
f543f253 MS |
888 | root_dentry = d_alloc_root(root); |
889 | if (!root_dentry) { | |
d8a5ba45 | 890 | iput(root); |
c2b8f006 | 891 | goto err_put_conn; |
d8a5ba45 | 892 | } |
f543f253 | 893 | |
ce1d5a49 MS |
894 | init_req = fuse_request_alloc(); |
895 | if (!init_req) | |
896 | goto err_put_root; | |
897 | ||
0ec7ca41 MS |
898 | if (is_bdev) { |
899 | fc->destroy_req = fuse_request_alloc(); | |
900 | if (!fc->destroy_req) | |
17e18ab6 | 901 | goto err_free_init_req; |
0ec7ca41 MS |
902 | } |
903 | ||
bafa9654 | 904 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
905 | err = -EINVAL; |
906 | if (file->private_data) | |
bafa9654 | 907 | goto err_unlock; |
8aa09a50 | 908 | |
bafa9654 MS |
909 | err = fuse_ctl_add_conn(fc); |
910 | if (err) | |
911 | goto err_unlock; | |
912 | ||
913 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 914 | sb->s_root = root_dentry; |
f543f253 | 915 | fc->connected = 1; |
bafa9654 MS |
916 | file->private_data = fuse_conn_get(fc); |
917 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
918 | /* |
919 | * atomic_dec_and_test() in fput() provides the necessary | |
920 | * memory barrier for file->private_data to be visible on all | |
921 | * CPUs after this | |
922 | */ | |
923 | fput(file); | |
f543f253 | 924 | |
ce1d5a49 | 925 | fuse_send_init(fc, init_req); |
f543f253 | 926 | |
d8a5ba45 MS |
927 | return 0; |
928 | ||
bafa9654 MS |
929 | err_unlock: |
930 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 931 | err_free_init_req: |
ce1d5a49 | 932 | fuse_request_free(init_req); |
f543f253 MS |
933 | err_put_root: |
934 | dput(root_dentry); | |
c2b8f006 | 935 | err_put_conn: |
a325f9b9 | 936 | fuse_bdi_destroy(fc); |
bafa9654 | 937 | fuse_conn_put(fc); |
c2b8f006 MS |
938 | err_fput: |
939 | fput(file); | |
940 | err: | |
d8a5ba45 MS |
941 | return err; |
942 | } | |
943 | ||
454e2398 DH |
944 | static int fuse_get_sb(struct file_system_type *fs_type, |
945 | int flags, const char *dev_name, | |
946 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 947 | { |
454e2398 | 948 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
949 | } |
950 | ||
875d95ec MS |
951 | static struct file_system_type fuse_fs_type = { |
952 | .owner = THIS_MODULE, | |
953 | .name = "fuse", | |
79c0b2df | 954 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec MS |
955 | .get_sb = fuse_get_sb, |
956 | .kill_sb = kill_anon_super, | |
957 | }; | |
958 | ||
959 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
960 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
961 | int flags, const char *dev_name, | |
962 | void *raw_data, struct vfsmount *mnt) | |
963 | { | |
964 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
965 | mnt); | |
966 | } | |
967 | ||
d6392f87 MS |
968 | static struct file_system_type fuseblk_fs_type = { |
969 | .owner = THIS_MODULE, | |
970 | .name = "fuseblk", | |
971 | .get_sb = fuse_get_sb_blk, | |
972 | .kill_sb = kill_block_super, | |
edad01e2 | 973 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
974 | }; |
975 | ||
875d95ec MS |
976 | static inline int register_fuseblk(void) |
977 | { | |
978 | return register_filesystem(&fuseblk_fs_type); | |
979 | } | |
980 | ||
981 | static inline void unregister_fuseblk(void) | |
982 | { | |
983 | unregister_filesystem(&fuseblk_fs_type); | |
984 | } | |
985 | #else | |
986 | static inline int register_fuseblk(void) | |
987 | { | |
988 | return 0; | |
989 | } | |
990 | ||
991 | static inline void unregister_fuseblk(void) | |
992 | { | |
993 | } | |
994 | #endif | |
995 | ||
51cc5068 | 996 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 997 | { |
1729a16c | 998 | struct inode *inode = foo; |
d8a5ba45 | 999 | |
a35afb83 | 1000 | inode_init_once(inode); |
d8a5ba45 MS |
1001 | } |
1002 | ||
1003 | static int __init fuse_fs_init(void) | |
1004 | { | |
1005 | int err; | |
1006 | ||
1007 | err = register_filesystem(&fuse_fs_type); | |
1008 | if (err) | |
d6392f87 MS |
1009 | goto out; |
1010 | ||
875d95ec | 1011 | err = register_fuseblk(); |
d6392f87 MS |
1012 | if (err) |
1013 | goto out_unreg; | |
1014 | ||
1015 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
1016 | sizeof(struct fuse_inode), | |
1017 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1018 | fuse_inode_init_once); |
d6392f87 MS |
1019 | err = -ENOMEM; |
1020 | if (!fuse_inode_cachep) | |
1021 | goto out_unreg2; | |
1022 | ||
1023 | return 0; | |
d8a5ba45 | 1024 | |
d6392f87 | 1025 | out_unreg2: |
875d95ec | 1026 | unregister_fuseblk(); |
d6392f87 MS |
1027 | out_unreg: |
1028 | unregister_filesystem(&fuse_fs_type); | |
1029 | out: | |
d8a5ba45 MS |
1030 | return err; |
1031 | } | |
1032 | ||
1033 | static void fuse_fs_cleanup(void) | |
1034 | { | |
1035 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1036 | unregister_fuseblk(); |
d8a5ba45 MS |
1037 | kmem_cache_destroy(fuse_inode_cachep); |
1038 | } | |
1039 | ||
5c89e17e GKH |
1040 | static struct kobject *fuse_kobj; |
1041 | static struct kobject *connections_kobj; | |
1042 | ||
f543f253 MS |
1043 | static int fuse_sysfs_init(void) |
1044 | { | |
1045 | int err; | |
1046 | ||
00d26666 | 1047 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1048 | if (!fuse_kobj) { |
1049 | err = -ENOMEM; | |
f543f253 | 1050 | goto out_err; |
5c89e17e | 1051 | } |
f543f253 | 1052 | |
5c89e17e GKH |
1053 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1054 | if (!connections_kobj) { | |
1055 | err = -ENOMEM; | |
f543f253 | 1056 | goto out_fuse_unregister; |
5c89e17e | 1057 | } |
f543f253 MS |
1058 | |
1059 | return 0; | |
1060 | ||
1061 | out_fuse_unregister: | |
197b12d6 | 1062 | kobject_put(fuse_kobj); |
f543f253 MS |
1063 | out_err: |
1064 | return err; | |
1065 | } | |
1066 | ||
1067 | static void fuse_sysfs_cleanup(void) | |
1068 | { | |
197b12d6 GKH |
1069 | kobject_put(connections_kobj); |
1070 | kobject_put(fuse_kobj); | |
f543f253 MS |
1071 | } |
1072 | ||
d8a5ba45 MS |
1073 | static int __init fuse_init(void) |
1074 | { | |
1075 | int res; | |
1076 | ||
1729a16c | 1077 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1078 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1079 | ||
bafa9654 | 1080 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1081 | res = fuse_fs_init(); |
1082 | if (res) | |
1083 | goto err; | |
1084 | ||
334f485d MS |
1085 | res = fuse_dev_init(); |
1086 | if (res) | |
1087 | goto err_fs_cleanup; | |
1088 | ||
f543f253 MS |
1089 | res = fuse_sysfs_init(); |
1090 | if (res) | |
1091 | goto err_dev_cleanup; | |
1092 | ||
bafa9654 MS |
1093 | res = fuse_ctl_init(); |
1094 | if (res) | |
1095 | goto err_sysfs_cleanup; | |
1096 | ||
d8a5ba45 MS |
1097 | return 0; |
1098 | ||
bafa9654 MS |
1099 | err_sysfs_cleanup: |
1100 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1101 | err_dev_cleanup: |
1102 | fuse_dev_cleanup(); | |
334f485d MS |
1103 | err_fs_cleanup: |
1104 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1105 | err: |
1106 | return res; | |
1107 | } | |
1108 | ||
1109 | static void __exit fuse_exit(void) | |
1110 | { | |
1111 | printk(KERN_DEBUG "fuse exit\n"); | |
1112 | ||
bafa9654 | 1113 | fuse_ctl_cleanup(); |
f543f253 | 1114 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1115 | fuse_fs_cleanup(); |
334f485d | 1116 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1117 | } |
1118 | ||
1119 | module_init(fuse_init); | |
1120 | module_exit(fuse_exit); |