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