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> |
67e55205 | 22 | #include <linux/smp_lock.h> |
d8a5ba45 MS |
23 | |
24 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
25 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
e18b890b | 28 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
29 | struct list_head fuse_conn_list; |
30 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
31 | |
32 | #define FUSE_SUPER_MAGIC 0x65735546 | |
33 | ||
d1875dba MS |
34 | #define FUSE_DEFAULT_BLKSIZE 512 |
35 | ||
d8a5ba45 MS |
36 | struct fuse_mount_data { |
37 | int fd; | |
38 | unsigned rootmode; | |
39 | unsigned user_id; | |
87729a55 | 40 | unsigned group_id; |
1729a16c 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; |
d8091614 | 47 | unsigned blksize; |
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 | ||
e94b1766 | 55 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
56 | if (!inode) |
57 | return NULL; | |
58 | ||
59 | fi = get_fuse_inode(inode); | |
0a0898cf | 60 | fi->i_time = 0; |
d8a5ba45 | 61 | fi->nodeid = 0; |
9e6268db | 62 | fi->nlookup = 0; |
fbee36b9 | 63 | fi->attr_version = 0; |
3be5a52b | 64 | fi->writectr = 0; |
93a8c3cd | 65 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
66 | INIT_LIST_HEAD(&fi->queued_writes); |
67 | INIT_LIST_HEAD(&fi->writepages); | |
68 | init_waitqueue_head(&fi->page_waitq); | |
e5e5558e MS |
69 | fi->forget_req = fuse_request_alloc(); |
70 | if (!fi->forget_req) { | |
71 | kmem_cache_free(fuse_inode_cachep, inode); | |
72 | return NULL; | |
73 | } | |
d8a5ba45 MS |
74 | |
75 | return inode; | |
76 | } | |
77 | ||
78 | static void fuse_destroy_inode(struct inode *inode) | |
79 | { | |
e5e5558e | 80 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 81 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 82 | BUG_ON(!list_empty(&fi->queued_writes)); |
e5e5558e MS |
83 | if (fi->forget_req) |
84 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
85 | kmem_cache_free(fuse_inode_cachep, inode); |
86 | } | |
87 | ||
e5e5558e | 88 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
b48badf0 | 89 | u64 nodeid, u64 nlookup) |
e5e5558e MS |
90 | { |
91 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 92 | inarg->nlookup = nlookup; |
e5e5558e MS |
93 | req->in.h.opcode = FUSE_FORGET; |
94 | req->in.h.nodeid = nodeid; | |
95 | req->in.numargs = 1; | |
96 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
97 | req->in.args[0].value = inarg; | |
b93f858a | 98 | fuse_request_send_noreply(fc, req); |
e5e5558e MS |
99 | } |
100 | ||
d8a5ba45 MS |
101 | static void fuse_clear_inode(struct inode *inode) |
102 | { | |
1e9a4ed9 MS |
103 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
104 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 105 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 106 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
107 | fi->forget_req = NULL; |
108 | } | |
d8a5ba45 MS |
109 | } |
110 | ||
71421259 MS |
111 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
112 | { | |
113 | if (*flags & MS_MANDLOCK) | |
114 | return -EINVAL; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
3be5a52b | 119 | void fuse_truncate(struct address_space *mapping, loff_t offset) |
e00d2c2d MS |
120 | { |
121 | /* See vmtruncate() */ | |
122 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
123 | truncate_inode_pages(mapping, offset); | |
124 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
125 | } | |
126 | ||
3be5a52b MS |
127 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
128 | u64 attr_valid) | |
d8a5ba45 | 129 | { |
9ffbb916 | 130 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 131 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 132 | |
1fb69e78 MS |
133 | fi->attr_version = ++fc->attr_version; |
134 | fi->i_time = attr_valid; | |
135 | ||
d8a5ba45 | 136 | inode->i_ino = attr->ino; |
ebc14c4d | 137 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
d8a5ba45 MS |
138 | inode->i_nlink = attr->nlink; |
139 | inode->i_uid = attr->uid; | |
140 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
141 | inode->i_blocks = attr->blocks; |
142 | inode->i_atime.tv_sec = attr->atime; | |
143 | inode->i_atime.tv_nsec = attr->atimensec; | |
144 | inode->i_mtime.tv_sec = attr->mtime; | |
145 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
146 | inode->i_ctime.tv_sec = attr->ctime; | |
147 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 148 | |
0e9663ee MS |
149 | if (attr->blksize != 0) |
150 | inode->i_blkbits = ilog2(attr->blksize); | |
151 | else | |
152 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
153 | ||
ebc14c4d MS |
154 | /* |
155 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
156 | * to check permissions. This prevents failures due to the | |
157 | * check in may_delete(). | |
158 | */ | |
159 | fi->orig_i_mode = inode->i_mode; | |
160 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
161 | inode->i_mode &= ~S_ISVTX; | |
3be5a52b MS |
162 | } |
163 | ||
164 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
165 | u64 attr_valid, u64 attr_version) | |
166 | { | |
167 | struct fuse_conn *fc = get_fuse_conn(inode); | |
168 | struct fuse_inode *fi = get_fuse_inode(inode); | |
169 | loff_t oldsize; | |
170 | ||
171 | spin_lock(&fc->lock); | |
172 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
173 | spin_unlock(&fc->lock); | |
174 | return; | |
175 | } | |
176 | ||
177 | fuse_change_attributes_common(inode, attr, attr_valid); | |
ebc14c4d | 178 | |
e00d2c2d MS |
179 | oldsize = inode->i_size; |
180 | i_size_write(inode, attr->size); | |
181 | spin_unlock(&fc->lock); | |
182 | ||
183 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
184 | if (attr->size < oldsize) | |
185 | fuse_truncate(inode->i_mapping, attr->size); | |
b1009979 | 186 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 187 | } |
d8a5ba45 MS |
188 | } |
189 | ||
190 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
191 | { | |
192 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 193 | inode->i_size = attr->size; |
e5e5558e MS |
194 | if (S_ISREG(inode->i_mode)) { |
195 | fuse_init_common(inode); | |
b6aeaded | 196 | fuse_init_file_inode(inode); |
e5e5558e MS |
197 | } else if (S_ISDIR(inode->i_mode)) |
198 | fuse_init_dir(inode); | |
199 | else if (S_ISLNK(inode->i_mode)) | |
200 | fuse_init_symlink(inode); | |
201 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
202 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
203 | fuse_init_common(inode); | |
204 | init_special_inode(inode, inode->i_mode, | |
205 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
206 | } else |
207 | BUG(); | |
d8a5ba45 MS |
208 | } |
209 | ||
210 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
211 | { | |
b48badf0 | 212 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
213 | if (get_node_id(inode) == nodeid) |
214 | return 1; | |
215 | else | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
220 | { | |
b48badf0 | 221 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
222 | get_fuse_inode(inode)->nodeid = nodeid; |
223 | return 0; | |
224 | } | |
225 | ||
b48badf0 | 226 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
227 | int generation, struct fuse_attr *attr, |
228 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
229 | { |
230 | struct inode *inode; | |
9e6268db | 231 | struct fuse_inode *fi; |
d8a5ba45 | 232 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
233 | |
234 | retry: | |
235 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
236 | if (!inode) | |
237 | return NULL; | |
238 | ||
239 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 240 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
241 | inode->i_generation = generation; |
242 | inode->i_data.backing_dev_info = &fc->bdi; | |
243 | fuse_init_inode(inode, attr); | |
244 | unlock_new_inode(inode); | |
245 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
246 | /* Inode has changed type, any I/O on the old should fail */ |
247 | make_bad_inode(inode); | |
248 | iput(inode); | |
d8a5ba45 MS |
249 | goto retry; |
250 | } | |
251 | ||
9e6268db | 252 | fi = get_fuse_inode(inode); |
8da5ff23 | 253 | spin_lock(&fc->lock); |
1729a16c | 254 | fi->nlookup++; |
8da5ff23 | 255 | spin_unlock(&fc->lock); |
1fb69e78 MS |
256 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
257 | ||
d8a5ba45 MS |
258 | return inode; |
259 | } | |
260 | ||
42faad99 | 261 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 262 | { |
67e55205 | 263 | lock_kernel(); |
42faad99 | 264 | fuse_abort_conn(get_fuse_conn_super(sb)); |
67e55205 | 265 | unlock_kernel(); |
69a53bf2 MS |
266 | } |
267 | ||
0ec7ca41 MS |
268 | static void fuse_send_destroy(struct fuse_conn *fc) |
269 | { | |
270 | struct fuse_req *req = fc->destroy_req; | |
271 | if (req && fc->conn_init) { | |
272 | fc->destroy_req = NULL; | |
273 | req->in.h.opcode = FUSE_DESTROY; | |
274 | req->force = 1; | |
b93f858a | 275 | fuse_request_send(fc, req); |
0ec7ca41 MS |
276 | fuse_put_request(fc, req); |
277 | } | |
278 | } | |
279 | ||
d8a5ba45 MS |
280 | static void fuse_put_super(struct super_block *sb) |
281 | { | |
282 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
283 | ||
0ec7ca41 | 284 | fuse_send_destroy(fc); |
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); | |
26c36791 | 298 | bdi_destroy(&fc->bdi); |
bafa9654 | 299 | fuse_conn_put(fc); |
d8a5ba45 MS |
300 | } |
301 | ||
e5e5558e MS |
302 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
303 | { | |
304 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
305 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 306 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
307 | stbuf->f_blocks = attr->blocks; |
308 | stbuf->f_bfree = attr->bfree; | |
309 | stbuf->f_bavail = attr->bavail; | |
310 | stbuf->f_files = attr->files; | |
311 | stbuf->f_ffree = attr->ffree; | |
312 | stbuf->f_namelen = attr->namelen; | |
313 | /* fsid is left zero */ | |
314 | } | |
315 | ||
726c3342 | 316 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 317 | { |
726c3342 | 318 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
319 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
320 | struct fuse_req *req; | |
321 | struct fuse_statfs_out outarg; | |
322 | int err; | |
323 | ||
e57ac683 MS |
324 | if (!fuse_allow_task(fc, current)) { |
325 | buf->f_type = FUSE_SUPER_MAGIC; | |
326 | return 0; | |
327 | } | |
328 | ||
ce1d5a49 MS |
329 | req = fuse_get_req(fc); |
330 | if (IS_ERR(req)) | |
331 | return PTR_ERR(req); | |
e5e5558e | 332 | |
de5f1202 | 333 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
334 | req->in.numargs = 0; |
335 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 336 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 337 | req->out.numargs = 1; |
de5f1202 MS |
338 | req->out.args[0].size = |
339 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 340 | req->out.args[0].value = &outarg; |
b93f858a | 341 | fuse_request_send(fc, req); |
e5e5558e MS |
342 | err = req->out.h.error; |
343 | if (!err) | |
344 | convert_fuse_statfs(buf, &outarg.st); | |
345 | fuse_put_request(fc, req); | |
346 | return err; | |
347 | } | |
348 | ||
d8a5ba45 MS |
349 | enum { |
350 | OPT_FD, | |
351 | OPT_ROOTMODE, | |
352 | OPT_USER_ID, | |
87729a55 | 353 | OPT_GROUP_ID, |
d8a5ba45 MS |
354 | OPT_DEFAULT_PERMISSIONS, |
355 | OPT_ALLOW_OTHER, | |
db50b96c | 356 | OPT_MAX_READ, |
d8091614 | 357 | OPT_BLKSIZE, |
d8a5ba45 MS |
358 | OPT_ERR |
359 | }; | |
360 | ||
a447c093 | 361 | static const match_table_t tokens = { |
d8a5ba45 MS |
362 | {OPT_FD, "fd=%u"}, |
363 | {OPT_ROOTMODE, "rootmode=%o"}, | |
364 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 365 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
366 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
367 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 368 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 369 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
370 | {OPT_ERR, NULL} |
371 | }; | |
372 | ||
d8091614 | 373 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
374 | { |
375 | char *p; | |
376 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 377 | d->max_read = ~0; |
d1875dba | 378 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
379 | |
380 | while ((p = strsep(&opt, ",")) != NULL) { | |
381 | int token; | |
382 | int value; | |
383 | substring_t args[MAX_OPT_ARGS]; | |
384 | if (!*p) | |
385 | continue; | |
386 | ||
387 | token = match_token(p, tokens, args); | |
388 | switch (token) { | |
389 | case OPT_FD: | |
390 | if (match_int(&args[0], &value)) | |
391 | return 0; | |
392 | d->fd = value; | |
5a533682 | 393 | d->fd_present = 1; |
d8a5ba45 MS |
394 | break; |
395 | ||
396 | case OPT_ROOTMODE: | |
397 | if (match_octal(&args[0], &value)) | |
398 | return 0; | |
a5bfffac TS |
399 | if (!fuse_valid_type(value)) |
400 | return 0; | |
d8a5ba45 | 401 | d->rootmode = value; |
5a533682 | 402 | d->rootmode_present = 1; |
d8a5ba45 MS |
403 | break; |
404 | ||
405 | case OPT_USER_ID: | |
406 | if (match_int(&args[0], &value)) | |
407 | return 0; | |
408 | d->user_id = value; | |
5a533682 | 409 | d->user_id_present = 1; |
d8a5ba45 MS |
410 | break; |
411 | ||
87729a55 MS |
412 | case OPT_GROUP_ID: |
413 | if (match_int(&args[0], &value)) | |
414 | return 0; | |
415 | d->group_id = value; | |
5a533682 | 416 | d->group_id_present = 1; |
87729a55 MS |
417 | break; |
418 | ||
1e9a4ed9 MS |
419 | case OPT_DEFAULT_PERMISSIONS: |
420 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
421 | break; | |
422 | ||
423 | case OPT_ALLOW_OTHER: | |
424 | d->flags |= FUSE_ALLOW_OTHER; | |
425 | break; | |
426 | ||
db50b96c MS |
427 | case OPT_MAX_READ: |
428 | if (match_int(&args[0], &value)) | |
429 | return 0; | |
430 | d->max_read = value; | |
431 | break; | |
432 | ||
d8091614 MS |
433 | case OPT_BLKSIZE: |
434 | if (!is_bdev || match_int(&args[0], &value)) | |
435 | return 0; | |
436 | d->blksize = value; | |
437 | break; | |
438 | ||
d8a5ba45 MS |
439 | default: |
440 | return 0; | |
441 | } | |
442 | } | |
5a533682 MS |
443 | |
444 | if (!d->fd_present || !d->rootmode_present || | |
445 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
446 | return 0; |
447 | ||
448 | return 1; | |
449 | } | |
450 | ||
451 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
452 | { | |
453 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
454 | ||
455 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 456 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
457 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
458 | seq_puts(m, ",default_permissions"); | |
459 | if (fc->flags & FUSE_ALLOW_OTHER) | |
460 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
461 | if (fc->max_read != ~0) |
462 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d1875dba MS |
463 | if (mnt->mnt_sb->s_bdev && |
464 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
465 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); | |
d8a5ba45 MS |
466 | return 0; |
467 | } | |
468 | ||
0d179aa5 | 469 | int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb) |
d8a5ba45 | 470 | { |
e0bf68dd | 471 | int err; |
d8a5ba45 | 472 | |
0d179aa5 TH |
473 | memset(fc, 0, sizeof(*fc)); |
474 | spin_lock_init(&fc->lock); | |
475 | mutex_init(&fc->inst_mutex); | |
476 | atomic_set(&fc->count, 1); | |
477 | init_waitqueue_head(&fc->waitq); | |
478 | init_waitqueue_head(&fc->blocked_waitq); | |
479 | init_waitqueue_head(&fc->reserved_req_waitq); | |
480 | INIT_LIST_HEAD(&fc->pending); | |
481 | INIT_LIST_HEAD(&fc->processing); | |
482 | INIT_LIST_HEAD(&fc->io); | |
483 | INIT_LIST_HEAD(&fc->interrupts); | |
484 | INIT_LIST_HEAD(&fc->bg_queue); | |
485 | INIT_LIST_HEAD(&fc->entry); | |
486 | atomic_set(&fc->num_waiting, 0); | |
487 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; | |
488 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
489 | /* fuse does it's own writeback accounting */ | |
490 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
491 | fc->khctr = 0; | |
492 | fc->polled_files = RB_ROOT; | |
493 | fc->dev = sb->s_dev; | |
494 | err = bdi_init(&fc->bdi); | |
495 | if (err) | |
496 | goto error_mutex_destroy; | |
497 | if (sb->s_bdev) { | |
498 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
499 | MAJOR(fc->dev), MINOR(fc->dev)); | |
500 | } else { | |
501 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
d8a5ba45 | 502 | } |
0d179aa5 TH |
503 | if (err) |
504 | goto error_bdi_destroy; | |
505 | /* | |
506 | * For a single fuse filesystem use max 1% of dirty + | |
507 | * writeback threshold. | |
508 | * | |
509 | * This gives about 1M of write buffer for memory maps on a | |
510 | * machine with 1G and 10% dirty_ratio, which should be more | |
511 | * than enough. | |
512 | * | |
513 | * Privileged users can raise it by writing to | |
514 | * | |
515 | * /sys/class/bdi/<bdi>/max_ratio | |
516 | */ | |
517 | bdi_set_max_ratio(&fc->bdi, 1); | |
518 | fc->reqctr = 0; | |
519 | fc->blocked = 1; | |
520 | fc->attr_version = 1; | |
521 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
b6f2fcbc | 522 | |
0d179aa5 TH |
523 | return 0; |
524 | ||
525 | error_bdi_destroy: | |
b6f2fcbc | 526 | bdi_destroy(&fc->bdi); |
0d179aa5 | 527 | error_mutex_destroy: |
b6f2fcbc | 528 | mutex_destroy(&fc->inst_mutex); |
0d179aa5 | 529 | return err; |
d8a5ba45 | 530 | } |
0d179aa5 | 531 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 532 | |
bafa9654 MS |
533 | void fuse_conn_put(struct fuse_conn *fc) |
534 | { | |
d2a85164 | 535 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
536 | if (fc->destroy_req) |
537 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 538 | mutex_destroy(&fc->inst_mutex); |
43901aab | 539 | fc->release(fc); |
d2a85164 | 540 | } |
bafa9654 MS |
541 | } |
542 | ||
543 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
544 | { | |
545 | atomic_inc(&fc->count); | |
546 | return fc; | |
547 | } | |
548 | ||
b93f858a | 549 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
550 | { |
551 | struct fuse_attr attr; | |
552 | memset(&attr, 0, sizeof(attr)); | |
553 | ||
554 | attr.mode = mode; | |
555 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 556 | attr.nlink = 1; |
1fb69e78 | 557 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
558 | } |
559 | ||
1729a16c | 560 | struct fuse_inode_handle { |
dbd561d2 MS |
561 | u64 nodeid; |
562 | u32 generation; | |
563 | }; | |
564 | ||
565 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
566 | struct fuse_inode_handle *handle) | |
567 | { | |
33670fa2 | 568 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
569 | struct inode *inode; |
570 | struct dentry *entry; | |
571 | int err = -ESTALE; | |
572 | ||
573 | if (handle->nodeid == 0) | |
574 | goto out_err; | |
575 | ||
576 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
577 | if (!inode) { |
578 | struct fuse_entry_out outarg; | |
579 | struct qstr name; | |
580 | ||
581 | if (!fc->export_support) | |
582 | goto out_err; | |
583 | ||
584 | name.len = 1; | |
585 | name.name = "."; | |
586 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
587 | &inode); | |
588 | if (err && err != -ENOENT) | |
589 | goto out_err; | |
590 | if (err || !inode) { | |
591 | err = -ESTALE; | |
592 | goto out_err; | |
593 | } | |
594 | err = -EIO; | |
595 | if (get_node_id(inode) != handle->nodeid) | |
596 | goto out_iput; | |
597 | } | |
dbd561d2 MS |
598 | err = -ESTALE; |
599 | if (inode->i_generation != handle->generation) | |
600 | goto out_iput; | |
601 | ||
44003728 CH |
602 | entry = d_obtain_alias(inode); |
603 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) { | |
dbd561d2 MS |
604 | entry->d_op = &fuse_dentry_operations; |
605 | fuse_invalidate_entry_cache(entry); | |
606 | } | |
607 | ||
608 | return entry; | |
609 | ||
610 | out_iput: | |
611 | iput(inode); | |
612 | out_err: | |
613 | return ERR_PTR(err); | |
614 | } | |
615 | ||
616 | static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, | |
617 | int connectable) | |
618 | { | |
619 | struct inode *inode = dentry->d_inode; | |
620 | bool encode_parent = connectable && !S_ISDIR(inode->i_mode); | |
621 | int len = encode_parent ? 6 : 3; | |
622 | u64 nodeid; | |
623 | u32 generation; | |
624 | ||
625 | if (*max_len < len) | |
626 | return 255; | |
627 | ||
628 | nodeid = get_fuse_inode(inode)->nodeid; | |
629 | generation = inode->i_generation; | |
630 | ||
631 | fh[0] = (u32)(nodeid >> 32); | |
632 | fh[1] = (u32)(nodeid & 0xffffffff); | |
633 | fh[2] = generation; | |
634 | ||
635 | if (encode_parent) { | |
636 | struct inode *parent; | |
637 | ||
638 | spin_lock(&dentry->d_lock); | |
639 | parent = dentry->d_parent->d_inode; | |
640 | nodeid = get_fuse_inode(parent)->nodeid; | |
641 | generation = parent->i_generation; | |
642 | spin_unlock(&dentry->d_lock); | |
643 | ||
644 | fh[3] = (u32)(nodeid >> 32); | |
645 | fh[4] = (u32)(nodeid & 0xffffffff); | |
646 | fh[5] = generation; | |
647 | } | |
648 | ||
649 | *max_len = len; | |
650 | return encode_parent ? 0x82 : 0x81; | |
651 | } | |
652 | ||
653 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
654 | struct fid *fid, int fh_len, int fh_type) | |
655 | { | |
656 | struct fuse_inode_handle handle; | |
657 | ||
658 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
659 | return NULL; | |
660 | ||
661 | handle.nodeid = (u64) fid->raw[0] << 32; | |
662 | handle.nodeid |= (u64) fid->raw[1]; | |
663 | handle.generation = fid->raw[2]; | |
664 | return fuse_get_dentry(sb, &handle); | |
665 | } | |
666 | ||
667 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
668 | struct fid *fid, int fh_len, int fh_type) | |
669 | { | |
670 | struct fuse_inode_handle parent; | |
671 | ||
672 | if (fh_type != 0x82 || fh_len < 6) | |
673 | return NULL; | |
674 | ||
675 | parent.nodeid = (u64) fid->raw[3] << 32; | |
676 | parent.nodeid |= (u64) fid->raw[4]; | |
677 | parent.generation = fid->raw[5]; | |
678 | return fuse_get_dentry(sb, &parent); | |
679 | } | |
680 | ||
33670fa2 MS |
681 | static struct dentry *fuse_get_parent(struct dentry *child) |
682 | { | |
683 | struct inode *child_inode = child->d_inode; | |
684 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
685 | struct inode *inode; | |
686 | struct dentry *parent; | |
687 | struct fuse_entry_out outarg; | |
688 | struct qstr name; | |
689 | int err; | |
690 | ||
691 | if (!fc->export_support) | |
692 | return ERR_PTR(-ESTALE); | |
693 | ||
694 | name.len = 2; | |
695 | name.name = ".."; | |
696 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
697 | &name, &outarg, &inode); | |
44003728 CH |
698 | if (err) { |
699 | if (err == -ENOENT) | |
700 | return ERR_PTR(-ESTALE); | |
33670fa2 | 701 | return ERR_PTR(err); |
33670fa2 | 702 | } |
44003728 CH |
703 | |
704 | parent = d_obtain_alias(inode); | |
705 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) { | |
33670fa2 MS |
706 | parent->d_op = &fuse_dentry_operations; |
707 | fuse_invalidate_entry_cache(parent); | |
708 | } | |
709 | ||
710 | return parent; | |
711 | } | |
dbd561d2 MS |
712 | |
713 | static const struct export_operations fuse_export_operations = { | |
714 | .fh_to_dentry = fuse_fh_to_dentry, | |
715 | .fh_to_parent = fuse_fh_to_parent, | |
716 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 717 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
718 | }; |
719 | ||
ee9b6d61 | 720 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
721 | .alloc_inode = fuse_alloc_inode, |
722 | .destroy_inode = fuse_destroy_inode, | |
d8a5ba45 | 723 | .clear_inode = fuse_clear_inode, |
ead5f0b5 | 724 | .drop_inode = generic_delete_inode, |
71421259 | 725 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 726 | .put_super = fuse_put_super, |
69a53bf2 | 727 | .umount_begin = fuse_umount_begin, |
e5e5558e | 728 | .statfs = fuse_statfs, |
d8a5ba45 MS |
729 | .show_options = fuse_show_options, |
730 | }; | |
731 | ||
9b9a0469 MS |
732 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
733 | { | |
9b9a0469 MS |
734 | struct fuse_init_out *arg = &req->misc.init_out; |
735 | ||
736 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
737 | fc->conn_error = 1; | |
738 | else { | |
9cd68455 MS |
739 | unsigned long ra_pages; |
740 | ||
741 | if (arg->minor >= 6) { | |
742 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
743 | if (arg->flags & FUSE_ASYNC_READ) | |
744 | fc->async_read = 1; | |
71421259 MS |
745 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
746 | fc->no_lock = 1; | |
6ff958ed MS |
747 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
748 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
749 | if (arg->minor >= 9) { |
750 | /* LOOKUP has dependency on proto version */ | |
751 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
752 | fc->export_support = 1; | |
753 | } | |
78bb6cb9 MS |
754 | if (arg->flags & FUSE_BIG_WRITES) |
755 | fc->big_writes = 1; | |
71421259 | 756 | } else { |
9cd68455 | 757 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
758 | fc->no_lock = 1; |
759 | } | |
9cd68455 MS |
760 | |
761 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
762 | fc->minor = arg->minor; |
763 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 764 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 765 | fc->conn_init = 1; |
9b9a0469 | 766 | } |
08a53cdc MS |
767 | fc->blocked = 0; |
768 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
769 | } |
770 | ||
ce1d5a49 | 771 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 772 | { |
9b9a0469 | 773 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 774 | |
9b9a0469 MS |
775 | arg->major = FUSE_KERNEL_VERSION; |
776 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 777 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 778 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
33670fa2 | 779 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES; |
9b9a0469 MS |
780 | req->in.h.opcode = FUSE_INIT; |
781 | req->in.numargs = 1; | |
782 | req->in.args[0].size = sizeof(*arg); | |
783 | req->in.args[0].value = arg; | |
784 | req->out.numargs = 1; | |
785 | /* Variable length arguement used for backward compatibility | |
786 | with interface version < 7.5. Rest of init_out is zeroed | |
787 | by do_get_request(), so a short reply is not a problem */ | |
788 | req->out.argvar = 1; | |
789 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
790 | req->out.args[0].value = &req->misc.init_out; | |
791 | req->end = process_init_reply; | |
b93f858a | 792 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
793 | } |
794 | ||
43901aab TH |
795 | static void fuse_free_conn(struct fuse_conn *fc) |
796 | { | |
797 | kfree(fc); | |
798 | } | |
799 | ||
d8a5ba45 MS |
800 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
801 | { | |
802 | struct fuse_conn *fc; | |
803 | struct inode *root; | |
804 | struct fuse_mount_data d; | |
805 | struct file *file; | |
f543f253 | 806 | struct dentry *root_dentry; |
ce1d5a49 | 807 | struct fuse_req *init_req; |
d8a5ba45 | 808 | int err; |
d8091614 | 809 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 810 | |
c2b8f006 | 811 | err = -EINVAL; |
71421259 | 812 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 813 | goto err; |
71421259 | 814 | |
d8091614 | 815 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 816 | goto err; |
d8a5ba45 | 817 | |
d8091614 | 818 | if (is_bdev) { |
875d95ec | 819 | #ifdef CONFIG_BLOCK |
c2b8f006 | 820 | err = -EINVAL; |
d8091614 | 821 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 822 | goto err; |
875d95ec | 823 | #endif |
d8091614 MS |
824 | } else { |
825 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
826 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
827 | } | |
d8a5ba45 MS |
828 | sb->s_magic = FUSE_SUPER_MAGIC; |
829 | sb->s_op = &fuse_super_operations; | |
830 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
dbd561d2 | 831 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
832 | |
833 | file = fget(d.fd); | |
c2b8f006 | 834 | err = -EINVAL; |
d8a5ba45 | 835 | if (!file) |
c2b8f006 | 836 | goto err; |
d8a5ba45 | 837 | |
c2b8f006 MS |
838 | if (file->f_op != &fuse_dev_operations) |
839 | goto err_fput; | |
0720b315 | 840 | |
0d179aa5 | 841 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
842 | err = -ENOMEM; |
843 | if (!fc) | |
844 | goto err_fput; | |
d8a5ba45 | 845 | |
0d179aa5 TH |
846 | err = fuse_conn_init(fc, sb); |
847 | if (err) { | |
848 | kfree(fc); | |
c2b8f006 | 849 | goto err_fput; |
0d179aa5 TH |
850 | } |
851 | ||
43901aab | 852 | fc->release = fuse_free_conn; |
1e9a4ed9 | 853 | fc->flags = d.flags; |
d8a5ba45 | 854 | fc->user_id = d.user_id; |
87729a55 | 855 | fc->group_id = d.group_id; |
f948d564 | 856 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 857 | |
f543f253 MS |
858 | /* Used by get_root_inode() */ |
859 | sb->s_fs_info = fc; | |
860 | ||
d8a5ba45 | 861 | err = -ENOMEM; |
b93f858a | 862 | root = fuse_get_root_inode(sb, d.rootmode); |
f543f253 | 863 | if (!root) |
c2b8f006 | 864 | goto err_put_conn; |
d8a5ba45 | 865 | |
f543f253 MS |
866 | root_dentry = d_alloc_root(root); |
867 | if (!root_dentry) { | |
d8a5ba45 | 868 | iput(root); |
c2b8f006 | 869 | goto err_put_conn; |
d8a5ba45 | 870 | } |
f543f253 | 871 | |
ce1d5a49 MS |
872 | init_req = fuse_request_alloc(); |
873 | if (!init_req) | |
874 | goto err_put_root; | |
875 | ||
0ec7ca41 MS |
876 | if (is_bdev) { |
877 | fc->destroy_req = fuse_request_alloc(); | |
878 | if (!fc->destroy_req) | |
17e18ab6 | 879 | goto err_free_init_req; |
0ec7ca41 MS |
880 | } |
881 | ||
bafa9654 | 882 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
883 | err = -EINVAL; |
884 | if (file->private_data) | |
bafa9654 | 885 | goto err_unlock; |
8aa09a50 | 886 | |
bafa9654 MS |
887 | err = fuse_ctl_add_conn(fc); |
888 | if (err) | |
889 | goto err_unlock; | |
890 | ||
891 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 892 | sb->s_root = root_dentry; |
f543f253 | 893 | fc->connected = 1; |
bafa9654 MS |
894 | file->private_data = fuse_conn_get(fc); |
895 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
896 | /* |
897 | * atomic_dec_and_test() in fput() provides the necessary | |
898 | * memory barrier for file->private_data to be visible on all | |
899 | * CPUs after this | |
900 | */ | |
901 | fput(file); | |
f543f253 | 902 | |
ce1d5a49 | 903 | fuse_send_init(fc, init_req); |
f543f253 | 904 | |
d8a5ba45 MS |
905 | return 0; |
906 | ||
bafa9654 MS |
907 | err_unlock: |
908 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 909 | err_free_init_req: |
ce1d5a49 | 910 | fuse_request_free(init_req); |
f543f253 MS |
911 | err_put_root: |
912 | dput(root_dentry); | |
c2b8f006 | 913 | err_put_conn: |
fd9db729 | 914 | bdi_destroy(&fc->bdi); |
bafa9654 | 915 | fuse_conn_put(fc); |
c2b8f006 MS |
916 | err_fput: |
917 | fput(file); | |
918 | err: | |
d8a5ba45 MS |
919 | return err; |
920 | } | |
921 | ||
454e2398 DH |
922 | static int fuse_get_sb(struct file_system_type *fs_type, |
923 | int flags, const char *dev_name, | |
924 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 925 | { |
454e2398 | 926 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
927 | } |
928 | ||
875d95ec MS |
929 | static struct file_system_type fuse_fs_type = { |
930 | .owner = THIS_MODULE, | |
931 | .name = "fuse", | |
79c0b2df | 932 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec MS |
933 | .get_sb = fuse_get_sb, |
934 | .kill_sb = kill_anon_super, | |
935 | }; | |
936 | ||
937 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
938 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
939 | int flags, const char *dev_name, | |
940 | void *raw_data, struct vfsmount *mnt) | |
941 | { | |
942 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
943 | mnt); | |
944 | } | |
945 | ||
d6392f87 MS |
946 | static struct file_system_type fuseblk_fs_type = { |
947 | .owner = THIS_MODULE, | |
948 | .name = "fuseblk", | |
949 | .get_sb = fuse_get_sb_blk, | |
950 | .kill_sb = kill_block_super, | |
edad01e2 | 951 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
952 | }; |
953 | ||
875d95ec MS |
954 | static inline int register_fuseblk(void) |
955 | { | |
956 | return register_filesystem(&fuseblk_fs_type); | |
957 | } | |
958 | ||
959 | static inline void unregister_fuseblk(void) | |
960 | { | |
961 | unregister_filesystem(&fuseblk_fs_type); | |
962 | } | |
963 | #else | |
964 | static inline int register_fuseblk(void) | |
965 | { | |
966 | return 0; | |
967 | } | |
968 | ||
969 | static inline void unregister_fuseblk(void) | |
970 | { | |
971 | } | |
972 | #endif | |
973 | ||
51cc5068 | 974 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 975 | { |
1729a16c | 976 | struct inode *inode = foo; |
d8a5ba45 | 977 | |
a35afb83 | 978 | inode_init_once(inode); |
d8a5ba45 MS |
979 | } |
980 | ||
981 | static int __init fuse_fs_init(void) | |
982 | { | |
983 | int err; | |
984 | ||
985 | err = register_filesystem(&fuse_fs_type); | |
986 | if (err) | |
d6392f87 MS |
987 | goto out; |
988 | ||
875d95ec | 989 | err = register_fuseblk(); |
d6392f87 MS |
990 | if (err) |
991 | goto out_unreg; | |
992 | ||
993 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
994 | sizeof(struct fuse_inode), | |
995 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 996 | fuse_inode_init_once); |
d6392f87 MS |
997 | err = -ENOMEM; |
998 | if (!fuse_inode_cachep) | |
999 | goto out_unreg2; | |
1000 | ||
1001 | return 0; | |
d8a5ba45 | 1002 | |
d6392f87 | 1003 | out_unreg2: |
875d95ec | 1004 | unregister_fuseblk(); |
d6392f87 MS |
1005 | out_unreg: |
1006 | unregister_filesystem(&fuse_fs_type); | |
1007 | out: | |
d8a5ba45 MS |
1008 | return err; |
1009 | } | |
1010 | ||
1011 | static void fuse_fs_cleanup(void) | |
1012 | { | |
1013 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1014 | unregister_fuseblk(); |
d8a5ba45 MS |
1015 | kmem_cache_destroy(fuse_inode_cachep); |
1016 | } | |
1017 | ||
5c89e17e GKH |
1018 | static struct kobject *fuse_kobj; |
1019 | static struct kobject *connections_kobj; | |
1020 | ||
f543f253 MS |
1021 | static int fuse_sysfs_init(void) |
1022 | { | |
1023 | int err; | |
1024 | ||
00d26666 | 1025 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1026 | if (!fuse_kobj) { |
1027 | err = -ENOMEM; | |
f543f253 | 1028 | goto out_err; |
5c89e17e | 1029 | } |
f543f253 | 1030 | |
5c89e17e GKH |
1031 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1032 | if (!connections_kobj) { | |
1033 | err = -ENOMEM; | |
f543f253 | 1034 | goto out_fuse_unregister; |
5c89e17e | 1035 | } |
f543f253 MS |
1036 | |
1037 | return 0; | |
1038 | ||
1039 | out_fuse_unregister: | |
197b12d6 | 1040 | kobject_put(fuse_kobj); |
f543f253 MS |
1041 | out_err: |
1042 | return err; | |
1043 | } | |
1044 | ||
1045 | static void fuse_sysfs_cleanup(void) | |
1046 | { | |
197b12d6 GKH |
1047 | kobject_put(connections_kobj); |
1048 | kobject_put(fuse_kobj); | |
f543f253 MS |
1049 | } |
1050 | ||
d8a5ba45 MS |
1051 | static int __init fuse_init(void) |
1052 | { | |
1053 | int res; | |
1054 | ||
1729a16c | 1055 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1056 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1057 | ||
bafa9654 | 1058 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1059 | res = fuse_fs_init(); |
1060 | if (res) | |
1061 | goto err; | |
1062 | ||
334f485d MS |
1063 | res = fuse_dev_init(); |
1064 | if (res) | |
1065 | goto err_fs_cleanup; | |
1066 | ||
f543f253 MS |
1067 | res = fuse_sysfs_init(); |
1068 | if (res) | |
1069 | goto err_dev_cleanup; | |
1070 | ||
bafa9654 MS |
1071 | res = fuse_ctl_init(); |
1072 | if (res) | |
1073 | goto err_sysfs_cleanup; | |
1074 | ||
d8a5ba45 MS |
1075 | return 0; |
1076 | ||
bafa9654 MS |
1077 | err_sysfs_cleanup: |
1078 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1079 | err_dev_cleanup: |
1080 | fuse_dev_cleanup(); | |
334f485d MS |
1081 | err_fs_cleanup: |
1082 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1083 | err: |
1084 | return res; | |
1085 | } | |
1086 | ||
1087 | static void __exit fuse_exit(void) | |
1088 | { | |
1089 | printk(KERN_DEBUG "fuse exit\n"); | |
1090 | ||
bafa9654 | 1091 | fuse_ctl_cleanup(); |
f543f253 | 1092 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1093 | fuse_fs_cleanup(); |
334f485d | 1094 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1095 | } |
1096 | ||
1097 | module_init(fuse_init); | |
1098 | module_exit(fuse_exit); |