Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
d7133114 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
d8a5ba45 MS |
17 | #include <linux/parser.h> |
18 | #include <linux/statfs.h> | |
9c8ef561 | 19 | #include <linux/random.h> |
e8edc6e0 | 20 | #include <linux/sched.h> |
d8a5ba45 MS |
21 | |
22 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
23 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
e18b890b | 26 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
27 | struct list_head fuse_conn_list; |
28 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
29 | |
30 | #define FUSE_SUPER_MAGIC 0x65735546 | |
31 | ||
32 | struct fuse_mount_data { | |
33 | int fd; | |
34 | unsigned rootmode; | |
35 | unsigned user_id; | |
87729a55 | 36 | unsigned group_id; |
5a533682 MS |
37 | unsigned fd_present : 1; |
38 | unsigned rootmode_present : 1; | |
39 | unsigned user_id_present : 1; | |
40 | unsigned group_id_present : 1; | |
1e9a4ed9 | 41 | unsigned flags; |
db50b96c | 42 | unsigned max_read; |
d8091614 | 43 | unsigned blksize; |
d8a5ba45 MS |
44 | }; |
45 | ||
46 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
47 | { | |
48 | struct inode *inode; | |
49 | struct fuse_inode *fi; | |
50 | ||
e94b1766 | 51 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
52 | if (!inode) |
53 | return NULL; | |
54 | ||
55 | fi = get_fuse_inode(inode); | |
0a0898cf | 56 | fi->i_time = 0; |
d8a5ba45 | 57 | fi->nodeid = 0; |
9e6268db | 58 | fi->nlookup = 0; |
93a8c3cd | 59 | INIT_LIST_HEAD(&fi->write_files); |
e5e5558e MS |
60 | fi->forget_req = fuse_request_alloc(); |
61 | if (!fi->forget_req) { | |
62 | kmem_cache_free(fuse_inode_cachep, inode); | |
63 | return NULL; | |
64 | } | |
d8a5ba45 MS |
65 | |
66 | return inode; | |
67 | } | |
68 | ||
69 | static void fuse_destroy_inode(struct inode *inode) | |
70 | { | |
e5e5558e | 71 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 72 | BUG_ON(!list_empty(&fi->write_files)); |
e5e5558e MS |
73 | if (fi->forget_req) |
74 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
75 | kmem_cache_free(fuse_inode_cachep, inode); |
76 | } | |
77 | ||
78 | static void fuse_read_inode(struct inode *inode) | |
79 | { | |
80 | /* No op */ | |
81 | } | |
82 | ||
e5e5558e | 83 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
9e6268db | 84 | unsigned long nodeid, u64 nlookup) |
e5e5558e MS |
85 | { |
86 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 87 | inarg->nlookup = nlookup; |
e5e5558e MS |
88 | req->in.h.opcode = FUSE_FORGET; |
89 | req->in.h.nodeid = nodeid; | |
90 | req->in.numargs = 1; | |
91 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
92 | req->in.args[0].value = inarg; | |
93 | request_send_noreply(fc, req); | |
94 | } | |
95 | ||
d8a5ba45 MS |
96 | static void fuse_clear_inode(struct inode *inode) |
97 | { | |
1e9a4ed9 MS |
98 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
99 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 100 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 101 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
102 | fi->forget_req = NULL; |
103 | } | |
d8a5ba45 MS |
104 | } |
105 | ||
71421259 MS |
106 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
107 | { | |
108 | if (*flags & MS_MANDLOCK) | |
109 | return -EINVAL; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
e00d2c2d MS |
114 | static void fuse_truncate(struct address_space *mapping, loff_t offset) |
115 | { | |
116 | /* See vmtruncate() */ | |
117 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
118 | truncate_inode_pages(mapping, offset); | |
119 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
120 | } | |
121 | ||
1fb69e78 MS |
122 | |
123 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
124 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 | 125 | { |
9ffbb916 | 126 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 127 | struct fuse_inode *fi = get_fuse_inode(inode); |
e00d2c2d | 128 | loff_t oldsize; |
d8a5ba45 | 129 | |
1fb69e78 MS |
130 | spin_lock(&fc->lock); |
131 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
132 | spin_unlock(&fc->lock); | |
133 | return; | |
134 | } | |
135 | fi->attr_version = ++fc->attr_version; | |
136 | fi->i_time = attr_valid; | |
137 | ||
d8a5ba45 | 138 | inode->i_ino = attr->ino; |
ebc14c4d | 139 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
d8a5ba45 MS |
140 | inode->i_nlink = attr->nlink; |
141 | inode->i_uid = attr->uid; | |
142 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
143 | inode->i_blocks = attr->blocks; |
144 | inode->i_atime.tv_sec = attr->atime; | |
145 | inode->i_atime.tv_nsec = attr->atimensec; | |
146 | inode->i_mtime.tv_sec = attr->mtime; | |
147 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
148 | inode->i_ctime.tv_sec = attr->ctime; | |
149 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 150 | |
0e9663ee MS |
151 | if (attr->blksize != 0) |
152 | inode->i_blkbits = ilog2(attr->blksize); | |
153 | else | |
154 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
155 | ||
ebc14c4d MS |
156 | /* |
157 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
158 | * to check permissions. This prevents failures due to the | |
159 | * check in may_delete(). | |
160 | */ | |
161 | fi->orig_i_mode = inode->i_mode; | |
162 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
163 | inode->i_mode &= ~S_ISVTX; | |
164 | ||
e00d2c2d MS |
165 | oldsize = inode->i_size; |
166 | i_size_write(inode, attr->size); | |
167 | spin_unlock(&fc->lock); | |
168 | ||
169 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
170 | if (attr->size < oldsize) | |
171 | fuse_truncate(inode->i_mapping, attr->size); | |
b1009979 | 172 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 173 | } |
d8a5ba45 MS |
174 | } |
175 | ||
176 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
177 | { | |
178 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 179 | inode->i_size = attr->size; |
e5e5558e MS |
180 | if (S_ISREG(inode->i_mode)) { |
181 | fuse_init_common(inode); | |
b6aeaded | 182 | fuse_init_file_inode(inode); |
e5e5558e MS |
183 | } else if (S_ISDIR(inode->i_mode)) |
184 | fuse_init_dir(inode); | |
185 | else if (S_ISLNK(inode->i_mode)) | |
186 | fuse_init_symlink(inode); | |
187 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
188 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
189 | fuse_init_common(inode); | |
190 | init_special_inode(inode, inode->i_mode, | |
191 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
192 | } else |
193 | BUG(); | |
d8a5ba45 MS |
194 | } |
195 | ||
196 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
197 | { | |
198 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
199 | if (get_node_id(inode) == nodeid) | |
200 | return 1; | |
201 | else | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
206 | { | |
207 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
208 | get_fuse_inode(inode)->nodeid = nodeid; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
1fb69e78 MS |
213 | int generation, struct fuse_attr *attr, |
214 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
215 | { |
216 | struct inode *inode; | |
9e6268db | 217 | struct fuse_inode *fi; |
d8a5ba45 | 218 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
219 | |
220 | retry: | |
221 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
222 | if (!inode) | |
223 | return NULL; | |
224 | ||
225 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 226 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
227 | inode->i_generation = generation; |
228 | inode->i_data.backing_dev_info = &fc->bdi; | |
229 | fuse_init_inode(inode, attr); | |
230 | unlock_new_inode(inode); | |
231 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
232 | /* Inode has changed type, any I/O on the old should fail */ |
233 | make_bad_inode(inode); | |
234 | iput(inode); | |
d8a5ba45 MS |
235 | goto retry; |
236 | } | |
237 | ||
9e6268db | 238 | fi = get_fuse_inode(inode); |
8da5ff23 | 239 | spin_lock(&fc->lock); |
9e6268db | 240 | fi->nlookup ++; |
8da5ff23 | 241 | spin_unlock(&fc->lock); |
1fb69e78 MS |
242 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
243 | ||
d8a5ba45 MS |
244 | return inode; |
245 | } | |
246 | ||
8b512d9a | 247 | static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) |
69a53bf2 | 248 | { |
8b512d9a TM |
249 | if (flags & MNT_FORCE) |
250 | fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); | |
69a53bf2 MS |
251 | } |
252 | ||
0ec7ca41 MS |
253 | static void fuse_send_destroy(struct fuse_conn *fc) |
254 | { | |
255 | struct fuse_req *req = fc->destroy_req; | |
256 | if (req && fc->conn_init) { | |
257 | fc->destroy_req = NULL; | |
258 | req->in.h.opcode = FUSE_DESTROY; | |
259 | req->force = 1; | |
260 | request_send(fc, req); | |
261 | fuse_put_request(fc, req); | |
262 | } | |
263 | } | |
264 | ||
d8a5ba45 MS |
265 | static void fuse_put_super(struct super_block *sb) |
266 | { | |
267 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
268 | ||
0ec7ca41 | 269 | fuse_send_destroy(fc); |
d7133114 | 270 | spin_lock(&fc->lock); |
9ba7cbba | 271 | fc->connected = 0; |
51eb01e7 | 272 | fc->blocked = 0; |
d7133114 | 273 | spin_unlock(&fc->lock); |
334f485d | 274 | /* Flush all readers on this fs */ |
385a17bf | 275 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 276 | wake_up_all(&fc->waitq); |
51eb01e7 | 277 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 278 | wake_up_all(&fc->reserved_req_waitq); |
bafa9654 MS |
279 | mutex_lock(&fuse_mutex); |
280 | list_del(&fc->entry); | |
281 | fuse_ctl_remove_conn(fc); | |
282 | mutex_unlock(&fuse_mutex); | |
283 | fuse_conn_put(fc); | |
d8a5ba45 MS |
284 | } |
285 | ||
e5e5558e MS |
286 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
287 | { | |
288 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
289 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 290 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
291 | stbuf->f_blocks = attr->blocks; |
292 | stbuf->f_bfree = attr->bfree; | |
293 | stbuf->f_bavail = attr->bavail; | |
294 | stbuf->f_files = attr->files; | |
295 | stbuf->f_ffree = attr->ffree; | |
296 | stbuf->f_namelen = attr->namelen; | |
297 | /* fsid is left zero */ | |
298 | } | |
299 | ||
726c3342 | 300 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 301 | { |
726c3342 | 302 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
303 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
304 | struct fuse_req *req; | |
305 | struct fuse_statfs_out outarg; | |
306 | int err; | |
307 | ||
e57ac683 MS |
308 | if (!fuse_allow_task(fc, current)) { |
309 | buf->f_type = FUSE_SUPER_MAGIC; | |
310 | return 0; | |
311 | } | |
312 | ||
ce1d5a49 MS |
313 | req = fuse_get_req(fc); |
314 | if (IS_ERR(req)) | |
315 | return PTR_ERR(req); | |
e5e5558e | 316 | |
de5f1202 | 317 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
318 | req->in.numargs = 0; |
319 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 320 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 321 | req->out.numargs = 1; |
de5f1202 MS |
322 | req->out.args[0].size = |
323 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
324 | req->out.args[0].value = &outarg; |
325 | request_send(fc, req); | |
326 | err = req->out.h.error; | |
327 | if (!err) | |
328 | convert_fuse_statfs(buf, &outarg.st); | |
329 | fuse_put_request(fc, req); | |
330 | return err; | |
331 | } | |
332 | ||
d8a5ba45 MS |
333 | enum { |
334 | OPT_FD, | |
335 | OPT_ROOTMODE, | |
336 | OPT_USER_ID, | |
87729a55 | 337 | OPT_GROUP_ID, |
d8a5ba45 MS |
338 | OPT_DEFAULT_PERMISSIONS, |
339 | OPT_ALLOW_OTHER, | |
db50b96c | 340 | OPT_MAX_READ, |
d8091614 | 341 | OPT_BLKSIZE, |
d8a5ba45 MS |
342 | OPT_ERR |
343 | }; | |
344 | ||
345 | static match_table_t tokens = { | |
346 | {OPT_FD, "fd=%u"}, | |
347 | {OPT_ROOTMODE, "rootmode=%o"}, | |
348 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 349 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
350 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
351 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 352 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 353 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
354 | {OPT_ERR, NULL} |
355 | }; | |
356 | ||
d8091614 | 357 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
358 | { |
359 | char *p; | |
360 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 361 | d->max_read = ~0; |
d8091614 | 362 | d->blksize = 512; |
d8a5ba45 MS |
363 | |
364 | while ((p = strsep(&opt, ",")) != NULL) { | |
365 | int token; | |
366 | int value; | |
367 | substring_t args[MAX_OPT_ARGS]; | |
368 | if (!*p) | |
369 | continue; | |
370 | ||
371 | token = match_token(p, tokens, args); | |
372 | switch (token) { | |
373 | case OPT_FD: | |
374 | if (match_int(&args[0], &value)) | |
375 | return 0; | |
376 | d->fd = value; | |
5a533682 | 377 | d->fd_present = 1; |
d8a5ba45 MS |
378 | break; |
379 | ||
380 | case OPT_ROOTMODE: | |
381 | if (match_octal(&args[0], &value)) | |
382 | return 0; | |
a5bfffac TS |
383 | if (!fuse_valid_type(value)) |
384 | return 0; | |
d8a5ba45 | 385 | d->rootmode = value; |
5a533682 | 386 | d->rootmode_present = 1; |
d8a5ba45 MS |
387 | break; |
388 | ||
389 | case OPT_USER_ID: | |
390 | if (match_int(&args[0], &value)) | |
391 | return 0; | |
392 | d->user_id = value; | |
5a533682 | 393 | d->user_id_present = 1; |
d8a5ba45 MS |
394 | break; |
395 | ||
87729a55 MS |
396 | case OPT_GROUP_ID: |
397 | if (match_int(&args[0], &value)) | |
398 | return 0; | |
399 | d->group_id = value; | |
5a533682 | 400 | d->group_id_present = 1; |
87729a55 MS |
401 | break; |
402 | ||
1e9a4ed9 MS |
403 | case OPT_DEFAULT_PERMISSIONS: |
404 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
405 | break; | |
406 | ||
407 | case OPT_ALLOW_OTHER: | |
408 | d->flags |= FUSE_ALLOW_OTHER; | |
409 | break; | |
410 | ||
db50b96c MS |
411 | case OPT_MAX_READ: |
412 | if (match_int(&args[0], &value)) | |
413 | return 0; | |
414 | d->max_read = value; | |
415 | break; | |
416 | ||
d8091614 MS |
417 | case OPT_BLKSIZE: |
418 | if (!is_bdev || match_int(&args[0], &value)) | |
419 | return 0; | |
420 | d->blksize = value; | |
421 | break; | |
422 | ||
d8a5ba45 MS |
423 | default: |
424 | return 0; | |
425 | } | |
426 | } | |
5a533682 MS |
427 | |
428 | if (!d->fd_present || !d->rootmode_present || | |
429 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
430 | return 0; |
431 | ||
432 | return 1; | |
433 | } | |
434 | ||
435 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
436 | { | |
437 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
438 | ||
439 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 440 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
441 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
442 | seq_puts(m, ",default_permissions"); | |
443 | if (fc->flags & FUSE_ALLOW_OTHER) | |
444 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
445 | if (fc->max_read != ~0) |
446 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
447 | return 0; |
448 | } | |
449 | ||
d8a5ba45 MS |
450 | static struct fuse_conn *new_conn(void) |
451 | { | |
452 | struct fuse_conn *fc; | |
e0bf68dd | 453 | int err; |
d8a5ba45 | 454 | |
6383bdaa | 455 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 456 | if (fc) { |
d7133114 | 457 | spin_lock_init(&fc->lock); |
d2a85164 | 458 | mutex_init(&fc->inst_mutex); |
bafa9654 | 459 | atomic_set(&fc->count, 1); |
334f485d | 460 | init_waitqueue_head(&fc->waitq); |
08a53cdc | 461 | init_waitqueue_head(&fc->blocked_waitq); |
de5e3dec | 462 | init_waitqueue_head(&fc->reserved_req_waitq); |
334f485d MS |
463 | INIT_LIST_HEAD(&fc->pending); |
464 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 465 | INIT_LIST_HEAD(&fc->io); |
a4d27e75 | 466 | INIT_LIST_HEAD(&fc->interrupts); |
095da6cb | 467 | atomic_set(&fc->num_waiting, 0); |
d8a5ba45 MS |
468 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
469 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
e0bf68dd PZ |
470 | err = bdi_init(&fc->bdi); |
471 | if (err) { | |
472 | kfree(fc); | |
473 | fc = NULL; | |
474 | goto out; | |
475 | } | |
334f485d | 476 | fc->reqctr = 0; |
08a53cdc | 477 | fc->blocked = 1; |
1fb69e78 | 478 | fc->attr_version = 1; |
9c8ef561 | 479 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
d8a5ba45 | 480 | } |
e0bf68dd | 481 | out: |
d8a5ba45 MS |
482 | return fc; |
483 | } | |
484 | ||
bafa9654 MS |
485 | void fuse_conn_put(struct fuse_conn *fc) |
486 | { | |
d2a85164 | 487 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
488 | if (fc->destroy_req) |
489 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 490 | mutex_destroy(&fc->inst_mutex); |
e0bf68dd | 491 | bdi_destroy(&fc->bdi); |
bafa9654 | 492 | kfree(fc); |
d2a85164 | 493 | } |
bafa9654 MS |
494 | } |
495 | ||
496 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
497 | { | |
498 | atomic_inc(&fc->count); | |
499 | return fc; | |
500 | } | |
501 | ||
d8a5ba45 MS |
502 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
503 | { | |
504 | struct fuse_attr attr; | |
505 | memset(&attr, 0, sizeof(attr)); | |
506 | ||
507 | attr.mode = mode; | |
508 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 509 | attr.nlink = 1; |
1fb69e78 | 510 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
511 | } |
512 | ||
ee9b6d61 | 513 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
514 | .alloc_inode = fuse_alloc_inode, |
515 | .destroy_inode = fuse_destroy_inode, | |
516 | .read_inode = fuse_read_inode, | |
517 | .clear_inode = fuse_clear_inode, | |
ead5f0b5 | 518 | .drop_inode = generic_delete_inode, |
71421259 | 519 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 520 | .put_super = fuse_put_super, |
69a53bf2 | 521 | .umount_begin = fuse_umount_begin, |
e5e5558e | 522 | .statfs = fuse_statfs, |
d8a5ba45 MS |
523 | .show_options = fuse_show_options, |
524 | }; | |
525 | ||
9b9a0469 MS |
526 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
527 | { | |
9b9a0469 MS |
528 | struct fuse_init_out *arg = &req->misc.init_out; |
529 | ||
530 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
531 | fc->conn_error = 1; | |
532 | else { | |
9cd68455 MS |
533 | unsigned long ra_pages; |
534 | ||
535 | if (arg->minor >= 6) { | |
536 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
537 | if (arg->flags & FUSE_ASYNC_READ) | |
538 | fc->async_read = 1; | |
71421259 MS |
539 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
540 | fc->no_lock = 1; | |
6ff958ed MS |
541 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
542 | fc->atomic_o_trunc = 1; | |
71421259 | 543 | } else { |
9cd68455 | 544 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
545 | fc->no_lock = 1; |
546 | } | |
9cd68455 MS |
547 | |
548 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
549 | fc->minor = arg->minor; |
550 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
0ec7ca41 | 551 | fc->conn_init = 1; |
9b9a0469 | 552 | } |
9b9a0469 | 553 | fuse_put_request(fc, req); |
08a53cdc MS |
554 | fc->blocked = 0; |
555 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
556 | } |
557 | ||
ce1d5a49 | 558 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 559 | { |
9b9a0469 | 560 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 561 | |
9b9a0469 MS |
562 | arg->major = FUSE_KERNEL_VERSION; |
563 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 564 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
6ff958ed MS |
565 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_FILE_OPS | |
566 | FUSE_ATOMIC_O_TRUNC; | |
9b9a0469 MS |
567 | req->in.h.opcode = FUSE_INIT; |
568 | req->in.numargs = 1; | |
569 | req->in.args[0].size = sizeof(*arg); | |
570 | req->in.args[0].value = arg; | |
571 | req->out.numargs = 1; | |
572 | /* Variable length arguement used for backward compatibility | |
573 | with interface version < 7.5. Rest of init_out is zeroed | |
574 | by do_get_request(), so a short reply is not a problem */ | |
575 | req->out.argvar = 1; | |
576 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
577 | req->out.args[0].value = &req->misc.init_out; | |
578 | req->end = process_init_reply; | |
579 | request_send_background(fc, req); | |
580 | } | |
581 | ||
bafa9654 | 582 | static u64 conn_id(void) |
f543f253 | 583 | { |
bafa9654 | 584 | static u64 ctr = 1; |
0720b315 | 585 | return ctr++; |
f543f253 MS |
586 | } |
587 | ||
d8a5ba45 MS |
588 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
589 | { | |
590 | struct fuse_conn *fc; | |
591 | struct inode *root; | |
592 | struct fuse_mount_data d; | |
593 | struct file *file; | |
f543f253 | 594 | struct dentry *root_dentry; |
ce1d5a49 | 595 | struct fuse_req *init_req; |
d8a5ba45 | 596 | int err; |
d8091614 | 597 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 598 | |
71421259 MS |
599 | if (sb->s_flags & MS_MANDLOCK) |
600 | return -EINVAL; | |
601 | ||
d8091614 | 602 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
d8a5ba45 MS |
603 | return -EINVAL; |
604 | ||
d8091614 | 605 | if (is_bdev) { |
875d95ec | 606 | #ifdef CONFIG_BLOCK |
d8091614 MS |
607 | if (!sb_set_blocksize(sb, d.blksize)) |
608 | return -EINVAL; | |
875d95ec | 609 | #endif |
d8091614 MS |
610 | } else { |
611 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
612 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
613 | } | |
d8a5ba45 MS |
614 | sb->s_magic = FUSE_SUPER_MAGIC; |
615 | sb->s_op = &fuse_super_operations; | |
616 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
617 | ||
618 | file = fget(d.fd); | |
619 | if (!file) | |
620 | return -EINVAL; | |
621 | ||
0720b315 MS |
622 | if (file->f_op != &fuse_dev_operations) |
623 | return -EINVAL; | |
624 | ||
0720b315 MS |
625 | fc = new_conn(); |
626 | if (!fc) | |
627 | return -ENOMEM; | |
d8a5ba45 | 628 | |
1e9a4ed9 | 629 | fc->flags = d.flags; |
d8a5ba45 | 630 | fc->user_id = d.user_id; |
87729a55 | 631 | fc->group_id = d.group_id; |
db50b96c | 632 | fc->max_read = d.max_read; |
d8a5ba45 | 633 | |
f543f253 MS |
634 | /* Used by get_root_inode() */ |
635 | sb->s_fs_info = fc; | |
636 | ||
d8a5ba45 MS |
637 | err = -ENOMEM; |
638 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 639 | if (!root) |
d8a5ba45 MS |
640 | goto err; |
641 | ||
f543f253 MS |
642 | root_dentry = d_alloc_root(root); |
643 | if (!root_dentry) { | |
d8a5ba45 MS |
644 | iput(root); |
645 | goto err; | |
646 | } | |
f543f253 | 647 | |
ce1d5a49 MS |
648 | init_req = fuse_request_alloc(); |
649 | if (!init_req) | |
650 | goto err_put_root; | |
651 | ||
0ec7ca41 MS |
652 | if (is_bdev) { |
653 | fc->destroy_req = fuse_request_alloc(); | |
654 | if (!fc->destroy_req) | |
655 | goto err_put_root; | |
656 | } | |
657 | ||
bafa9654 | 658 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
659 | err = -EINVAL; |
660 | if (file->private_data) | |
bafa9654 | 661 | goto err_unlock; |
8aa09a50 | 662 | |
bafa9654 MS |
663 | fc->id = conn_id(); |
664 | err = fuse_ctl_add_conn(fc); | |
665 | if (err) | |
666 | goto err_unlock; | |
667 | ||
668 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 669 | sb->s_root = root_dentry; |
f543f253 | 670 | fc->connected = 1; |
bafa9654 MS |
671 | file->private_data = fuse_conn_get(fc); |
672 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
673 | /* |
674 | * atomic_dec_and_test() in fput() provides the necessary | |
675 | * memory barrier for file->private_data to be visible on all | |
676 | * CPUs after this | |
677 | */ | |
678 | fput(file); | |
f543f253 | 679 | |
ce1d5a49 | 680 | fuse_send_init(fc, init_req); |
f543f253 | 681 | |
d8a5ba45 MS |
682 | return 0; |
683 | ||
bafa9654 MS |
684 | err_unlock: |
685 | mutex_unlock(&fuse_mutex); | |
ce1d5a49 | 686 | fuse_request_free(init_req); |
f543f253 MS |
687 | err_put_root: |
688 | dput(root_dentry); | |
d8a5ba45 | 689 | err: |
0720b315 | 690 | fput(file); |
bafa9654 | 691 | fuse_conn_put(fc); |
d8a5ba45 MS |
692 | return err; |
693 | } | |
694 | ||
454e2398 DH |
695 | static int fuse_get_sb(struct file_system_type *fs_type, |
696 | int flags, const char *dev_name, | |
697 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 698 | { |
454e2398 | 699 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
700 | } |
701 | ||
875d95ec MS |
702 | static struct file_system_type fuse_fs_type = { |
703 | .owner = THIS_MODULE, | |
704 | .name = "fuse", | |
79c0b2df | 705 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec MS |
706 | .get_sb = fuse_get_sb, |
707 | .kill_sb = kill_anon_super, | |
708 | }; | |
709 | ||
710 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
711 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
712 | int flags, const char *dev_name, | |
713 | void *raw_data, struct vfsmount *mnt) | |
714 | { | |
715 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
716 | mnt); | |
717 | } | |
718 | ||
d6392f87 MS |
719 | static struct file_system_type fuseblk_fs_type = { |
720 | .owner = THIS_MODULE, | |
721 | .name = "fuseblk", | |
722 | .get_sb = fuse_get_sb_blk, | |
723 | .kill_sb = kill_block_super, | |
edad01e2 | 724 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
725 | }; |
726 | ||
875d95ec MS |
727 | static inline int register_fuseblk(void) |
728 | { | |
729 | return register_filesystem(&fuseblk_fs_type); | |
730 | } | |
731 | ||
732 | static inline void unregister_fuseblk(void) | |
733 | { | |
734 | unregister_filesystem(&fuseblk_fs_type); | |
735 | } | |
736 | #else | |
737 | static inline int register_fuseblk(void) | |
738 | { | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static inline void unregister_fuseblk(void) | |
743 | { | |
744 | } | |
745 | #endif | |
746 | ||
f543f253 | 747 | static decl_subsys(fuse, NULL, NULL); |
bafa9654 | 748 | static decl_subsys(connections, NULL, NULL); |
f543f253 | 749 | |
4ba9b9d0 | 750 | static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) |
d8a5ba45 MS |
751 | { |
752 | struct inode * inode = foo; | |
753 | ||
a35afb83 | 754 | inode_init_once(inode); |
d8a5ba45 MS |
755 | } |
756 | ||
757 | static int __init fuse_fs_init(void) | |
758 | { | |
759 | int err; | |
760 | ||
761 | err = register_filesystem(&fuse_fs_type); | |
762 | if (err) | |
d6392f87 MS |
763 | goto out; |
764 | ||
875d95ec | 765 | err = register_fuseblk(); |
d6392f87 MS |
766 | if (err) |
767 | goto out_unreg; | |
768 | ||
769 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
770 | sizeof(struct fuse_inode), | |
771 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 772 | fuse_inode_init_once); |
d6392f87 MS |
773 | err = -ENOMEM; |
774 | if (!fuse_inode_cachep) | |
775 | goto out_unreg2; | |
776 | ||
777 | return 0; | |
d8a5ba45 | 778 | |
d6392f87 | 779 | out_unreg2: |
875d95ec | 780 | unregister_fuseblk(); |
d6392f87 MS |
781 | out_unreg: |
782 | unregister_filesystem(&fuse_fs_type); | |
783 | out: | |
d8a5ba45 MS |
784 | return err; |
785 | } | |
786 | ||
787 | static void fuse_fs_cleanup(void) | |
788 | { | |
789 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 790 | unregister_fuseblk(); |
d8a5ba45 MS |
791 | kmem_cache_destroy(fuse_inode_cachep); |
792 | } | |
793 | ||
f543f253 MS |
794 | static int fuse_sysfs_init(void) |
795 | { | |
796 | int err; | |
797 | ||
823bccfc | 798 | kobj_set_kset_s(&fuse_subsys, fs_subsys); |
f543f253 MS |
799 | err = subsystem_register(&fuse_subsys); |
800 | if (err) | |
801 | goto out_err; | |
802 | ||
823bccfc | 803 | kobj_set_kset_s(&connections_subsys, fuse_subsys); |
f543f253 MS |
804 | err = subsystem_register(&connections_subsys); |
805 | if (err) | |
806 | goto out_fuse_unregister; | |
807 | ||
808 | return 0; | |
809 | ||
810 | out_fuse_unregister: | |
811 | subsystem_unregister(&fuse_subsys); | |
812 | out_err: | |
813 | return err; | |
814 | } | |
815 | ||
816 | static void fuse_sysfs_cleanup(void) | |
817 | { | |
818 | subsystem_unregister(&connections_subsys); | |
819 | subsystem_unregister(&fuse_subsys); | |
820 | } | |
821 | ||
d8a5ba45 MS |
822 | static int __init fuse_init(void) |
823 | { | |
824 | int res; | |
825 | ||
826 | printk("fuse init (API version %i.%i)\n", | |
827 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
828 | ||
bafa9654 | 829 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
830 | res = fuse_fs_init(); |
831 | if (res) | |
832 | goto err; | |
833 | ||
334f485d MS |
834 | res = fuse_dev_init(); |
835 | if (res) | |
836 | goto err_fs_cleanup; | |
837 | ||
f543f253 MS |
838 | res = fuse_sysfs_init(); |
839 | if (res) | |
840 | goto err_dev_cleanup; | |
841 | ||
bafa9654 MS |
842 | res = fuse_ctl_init(); |
843 | if (res) | |
844 | goto err_sysfs_cleanup; | |
845 | ||
d8a5ba45 MS |
846 | return 0; |
847 | ||
bafa9654 MS |
848 | err_sysfs_cleanup: |
849 | fuse_sysfs_cleanup(); | |
f543f253 MS |
850 | err_dev_cleanup: |
851 | fuse_dev_cleanup(); | |
334f485d MS |
852 | err_fs_cleanup: |
853 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
854 | err: |
855 | return res; | |
856 | } | |
857 | ||
858 | static void __exit fuse_exit(void) | |
859 | { | |
860 | printk(KERN_DEBUG "fuse exit\n"); | |
861 | ||
bafa9654 | 862 | fuse_ctl_cleanup(); |
f543f253 | 863 | fuse_sysfs_cleanup(); |
d8a5ba45 | 864 | fuse_fs_cleanup(); |
334f485d | 865 | fuse_dev_cleanup(); |
d8a5ba45 MS |
866 | } |
867 | ||
868 | module_init(fuse_init); | |
869 | module_exit(fuse_exit); |