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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 | ||
d8a5ba45 MS |
112 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) |
113 | { | |
9ffbb916 | 114 | struct fuse_conn *fc = get_fuse_conn(inode); |
d8a5ba45 | 115 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) |
fc0ecff6 | 116 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
d8a5ba45 MS |
117 | |
118 | inode->i_ino = attr->ino; | |
119 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); | |
120 | inode->i_nlink = attr->nlink; | |
121 | inode->i_uid = attr->uid; | |
122 | inode->i_gid = attr->gid; | |
9ffbb916 | 123 | spin_lock(&fc->lock); |
d8a5ba45 | 124 | i_size_write(inode, attr->size); |
9ffbb916 | 125 | spin_unlock(&fc->lock); |
d8a5ba45 MS |
126 | inode->i_blocks = attr->blocks; |
127 | inode->i_atime.tv_sec = attr->atime; | |
128 | inode->i_atime.tv_nsec = attr->atimensec; | |
129 | inode->i_mtime.tv_sec = attr->mtime; | |
130 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
131 | inode->i_ctime.tv_sec = attr->ctime; | |
132 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
133 | } | |
134 | ||
135 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
136 | { | |
137 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 138 | inode->i_size = attr->size; |
e5e5558e MS |
139 | if (S_ISREG(inode->i_mode)) { |
140 | fuse_init_common(inode); | |
b6aeaded | 141 | fuse_init_file_inode(inode); |
e5e5558e MS |
142 | } else if (S_ISDIR(inode->i_mode)) |
143 | fuse_init_dir(inode); | |
144 | else if (S_ISLNK(inode->i_mode)) | |
145 | fuse_init_symlink(inode); | |
146 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
147 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
148 | fuse_init_common(inode); | |
149 | init_special_inode(inode, inode->i_mode, | |
150 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
151 | } else |
152 | BUG(); | |
d8a5ba45 MS |
153 | } |
154 | ||
155 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
156 | { | |
157 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
158 | if (get_node_id(inode) == nodeid) | |
159 | return 1; | |
160 | else | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
165 | { | |
166 | unsigned long nodeid = *(unsigned long *) _nodeidp; | |
167 | get_fuse_inode(inode)->nodeid = nodeid; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, | |
9e6268db | 172 | int generation, struct fuse_attr *attr) |
d8a5ba45 MS |
173 | { |
174 | struct inode *inode; | |
9e6268db | 175 | struct fuse_inode *fi; |
d8a5ba45 | 176 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
177 | |
178 | retry: | |
179 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
180 | if (!inode) | |
181 | return NULL; | |
182 | ||
183 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 184 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
185 | inode->i_generation = generation; |
186 | inode->i_data.backing_dev_info = &fc->bdi; | |
187 | fuse_init_inode(inode, attr); | |
188 | unlock_new_inode(inode); | |
189 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
190 | /* Inode has changed type, any I/O on the old should fail */ |
191 | make_bad_inode(inode); | |
192 | iput(inode); | |
d8a5ba45 MS |
193 | goto retry; |
194 | } | |
195 | ||
9e6268db | 196 | fi = get_fuse_inode(inode); |
8da5ff23 | 197 | spin_lock(&fc->lock); |
9e6268db | 198 | fi->nlookup ++; |
8da5ff23 | 199 | spin_unlock(&fc->lock); |
d8a5ba45 | 200 | fuse_change_attributes(inode, attr); |
d8a5ba45 MS |
201 | return inode; |
202 | } | |
203 | ||
8b512d9a | 204 | static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) |
69a53bf2 | 205 | { |
8b512d9a TM |
206 | if (flags & MNT_FORCE) |
207 | fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); | |
69a53bf2 MS |
208 | } |
209 | ||
0ec7ca41 MS |
210 | static void fuse_send_destroy(struct fuse_conn *fc) |
211 | { | |
212 | struct fuse_req *req = fc->destroy_req; | |
213 | if (req && fc->conn_init) { | |
214 | fc->destroy_req = NULL; | |
215 | req->in.h.opcode = FUSE_DESTROY; | |
216 | req->force = 1; | |
217 | request_send(fc, req); | |
218 | fuse_put_request(fc, req); | |
219 | } | |
220 | } | |
221 | ||
d8a5ba45 MS |
222 | static void fuse_put_super(struct super_block *sb) |
223 | { | |
224 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
225 | ||
0ec7ca41 | 226 | fuse_send_destroy(fc); |
d7133114 | 227 | spin_lock(&fc->lock); |
9ba7cbba | 228 | fc->connected = 0; |
51eb01e7 | 229 | fc->blocked = 0; |
d7133114 | 230 | spin_unlock(&fc->lock); |
334f485d | 231 | /* Flush all readers on this fs */ |
385a17bf | 232 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 233 | wake_up_all(&fc->waitq); |
51eb01e7 | 234 | wake_up_all(&fc->blocked_waitq); |
bafa9654 MS |
235 | mutex_lock(&fuse_mutex); |
236 | list_del(&fc->entry); | |
237 | fuse_ctl_remove_conn(fc); | |
238 | mutex_unlock(&fuse_mutex); | |
239 | fuse_conn_put(fc); | |
d8a5ba45 MS |
240 | } |
241 | ||
e5e5558e MS |
242 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
243 | { | |
244 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
245 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 246 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
247 | stbuf->f_blocks = attr->blocks; |
248 | stbuf->f_bfree = attr->bfree; | |
249 | stbuf->f_bavail = attr->bavail; | |
250 | stbuf->f_files = attr->files; | |
251 | stbuf->f_ffree = attr->ffree; | |
252 | stbuf->f_namelen = attr->namelen; | |
253 | /* fsid is left zero */ | |
254 | } | |
255 | ||
726c3342 | 256 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 257 | { |
726c3342 | 258 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
259 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
260 | struct fuse_req *req; | |
261 | struct fuse_statfs_out outarg; | |
262 | int err; | |
263 | ||
ce1d5a49 MS |
264 | req = fuse_get_req(fc); |
265 | if (IS_ERR(req)) | |
266 | return PTR_ERR(req); | |
e5e5558e | 267 | |
de5f1202 | 268 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
269 | req->in.numargs = 0; |
270 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 271 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 272 | req->out.numargs = 1; |
de5f1202 MS |
273 | req->out.args[0].size = |
274 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
275 | req->out.args[0].value = &outarg; |
276 | request_send(fc, req); | |
277 | err = req->out.h.error; | |
278 | if (!err) | |
279 | convert_fuse_statfs(buf, &outarg.st); | |
280 | fuse_put_request(fc, req); | |
281 | return err; | |
282 | } | |
283 | ||
d8a5ba45 MS |
284 | enum { |
285 | OPT_FD, | |
286 | OPT_ROOTMODE, | |
287 | OPT_USER_ID, | |
87729a55 | 288 | OPT_GROUP_ID, |
d8a5ba45 MS |
289 | OPT_DEFAULT_PERMISSIONS, |
290 | OPT_ALLOW_OTHER, | |
db50b96c | 291 | OPT_MAX_READ, |
d8091614 | 292 | OPT_BLKSIZE, |
d8a5ba45 MS |
293 | OPT_ERR |
294 | }; | |
295 | ||
296 | static match_table_t tokens = { | |
297 | {OPT_FD, "fd=%u"}, | |
298 | {OPT_ROOTMODE, "rootmode=%o"}, | |
299 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 300 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
301 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
302 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 303 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 304 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
305 | {OPT_ERR, NULL} |
306 | }; | |
307 | ||
d8091614 | 308 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
309 | { |
310 | char *p; | |
311 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 312 | d->max_read = ~0; |
d8091614 | 313 | d->blksize = 512; |
d8a5ba45 MS |
314 | |
315 | while ((p = strsep(&opt, ",")) != NULL) { | |
316 | int token; | |
317 | int value; | |
318 | substring_t args[MAX_OPT_ARGS]; | |
319 | if (!*p) | |
320 | continue; | |
321 | ||
322 | token = match_token(p, tokens, args); | |
323 | switch (token) { | |
324 | case OPT_FD: | |
325 | if (match_int(&args[0], &value)) | |
326 | return 0; | |
327 | d->fd = value; | |
5a533682 | 328 | d->fd_present = 1; |
d8a5ba45 MS |
329 | break; |
330 | ||
331 | case OPT_ROOTMODE: | |
332 | if (match_octal(&args[0], &value)) | |
333 | return 0; | |
a5bfffac TS |
334 | if (!fuse_valid_type(value)) |
335 | return 0; | |
d8a5ba45 | 336 | d->rootmode = value; |
5a533682 | 337 | d->rootmode_present = 1; |
d8a5ba45 MS |
338 | break; |
339 | ||
340 | case OPT_USER_ID: | |
341 | if (match_int(&args[0], &value)) | |
342 | return 0; | |
343 | d->user_id = value; | |
5a533682 | 344 | d->user_id_present = 1; |
d8a5ba45 MS |
345 | break; |
346 | ||
87729a55 MS |
347 | case OPT_GROUP_ID: |
348 | if (match_int(&args[0], &value)) | |
349 | return 0; | |
350 | d->group_id = value; | |
5a533682 | 351 | d->group_id_present = 1; |
87729a55 MS |
352 | break; |
353 | ||
1e9a4ed9 MS |
354 | case OPT_DEFAULT_PERMISSIONS: |
355 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
356 | break; | |
357 | ||
358 | case OPT_ALLOW_OTHER: | |
359 | d->flags |= FUSE_ALLOW_OTHER; | |
360 | break; | |
361 | ||
db50b96c MS |
362 | case OPT_MAX_READ: |
363 | if (match_int(&args[0], &value)) | |
364 | return 0; | |
365 | d->max_read = value; | |
366 | break; | |
367 | ||
d8091614 MS |
368 | case OPT_BLKSIZE: |
369 | if (!is_bdev || match_int(&args[0], &value)) | |
370 | return 0; | |
371 | d->blksize = value; | |
372 | break; | |
373 | ||
d8a5ba45 MS |
374 | default: |
375 | return 0; | |
376 | } | |
377 | } | |
5a533682 MS |
378 | |
379 | if (!d->fd_present || !d->rootmode_present || | |
380 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
381 | return 0; |
382 | ||
383 | return 1; | |
384 | } | |
385 | ||
386 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
387 | { | |
388 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
389 | ||
390 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 391 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
392 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
393 | seq_puts(m, ",default_permissions"); | |
394 | if (fc->flags & FUSE_ALLOW_OTHER) | |
395 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
396 | if (fc->max_read != ~0) |
397 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d8a5ba45 MS |
398 | return 0; |
399 | } | |
400 | ||
d8a5ba45 MS |
401 | static struct fuse_conn *new_conn(void) |
402 | { | |
403 | struct fuse_conn *fc; | |
404 | ||
6383bdaa | 405 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 406 | if (fc) { |
d7133114 | 407 | spin_lock_init(&fc->lock); |
d2a85164 | 408 | mutex_init(&fc->inst_mutex); |
bafa9654 | 409 | atomic_set(&fc->count, 1); |
334f485d | 410 | init_waitqueue_head(&fc->waitq); |
08a53cdc | 411 | init_waitqueue_head(&fc->blocked_waitq); |
334f485d MS |
412 | INIT_LIST_HEAD(&fc->pending); |
413 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 414 | INIT_LIST_HEAD(&fc->io); |
a4d27e75 | 415 | INIT_LIST_HEAD(&fc->interrupts); |
095da6cb | 416 | atomic_set(&fc->num_waiting, 0); |
d8a5ba45 MS |
417 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
418 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
334f485d | 419 | fc->reqctr = 0; |
08a53cdc | 420 | fc->blocked = 1; |
9c8ef561 | 421 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
d8a5ba45 MS |
422 | } |
423 | return fc; | |
424 | } | |
425 | ||
bafa9654 MS |
426 | void fuse_conn_put(struct fuse_conn *fc) |
427 | { | |
d2a85164 | 428 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
429 | if (fc->destroy_req) |
430 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 431 | mutex_destroy(&fc->inst_mutex); |
bafa9654 | 432 | kfree(fc); |
d2a85164 | 433 | } |
bafa9654 MS |
434 | } |
435 | ||
436 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
437 | { | |
438 | atomic_inc(&fc->count); | |
439 | return fc; | |
440 | } | |
441 | ||
d8a5ba45 MS |
442 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
443 | { | |
444 | struct fuse_attr attr; | |
445 | memset(&attr, 0, sizeof(attr)); | |
446 | ||
447 | attr.mode = mode; | |
448 | attr.ino = FUSE_ROOT_ID; | |
9e6268db | 449 | return fuse_iget(sb, 1, 0, &attr); |
d8a5ba45 MS |
450 | } |
451 | ||
ee9b6d61 | 452 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
453 | .alloc_inode = fuse_alloc_inode, |
454 | .destroy_inode = fuse_destroy_inode, | |
455 | .read_inode = fuse_read_inode, | |
456 | .clear_inode = fuse_clear_inode, | |
ead5f0b5 | 457 | .drop_inode = generic_delete_inode, |
71421259 | 458 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 459 | .put_super = fuse_put_super, |
69a53bf2 | 460 | .umount_begin = fuse_umount_begin, |
e5e5558e | 461 | .statfs = fuse_statfs, |
d8a5ba45 MS |
462 | .show_options = fuse_show_options, |
463 | }; | |
464 | ||
9b9a0469 MS |
465 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
466 | { | |
9b9a0469 MS |
467 | struct fuse_init_out *arg = &req->misc.init_out; |
468 | ||
469 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
470 | fc->conn_error = 1; | |
471 | else { | |
9cd68455 MS |
472 | unsigned long ra_pages; |
473 | ||
474 | if (arg->minor >= 6) { | |
475 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
476 | if (arg->flags & FUSE_ASYNC_READ) | |
477 | fc->async_read = 1; | |
71421259 MS |
478 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
479 | fc->no_lock = 1; | |
480 | } else { | |
9cd68455 | 481 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
482 | fc->no_lock = 1; |
483 | } | |
9cd68455 MS |
484 | |
485 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
486 | fc->minor = arg->minor; |
487 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
0ec7ca41 | 488 | fc->conn_init = 1; |
9b9a0469 | 489 | } |
9b9a0469 | 490 | fuse_put_request(fc, req); |
08a53cdc MS |
491 | fc->blocked = 0; |
492 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
493 | } |
494 | ||
ce1d5a49 | 495 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 496 | { |
9b9a0469 | 497 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 498 | |
9b9a0469 MS |
499 | arg->major = FUSE_KERNEL_VERSION; |
500 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 501 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
71421259 | 502 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS; |
9b9a0469 MS |
503 | req->in.h.opcode = FUSE_INIT; |
504 | req->in.numargs = 1; | |
505 | req->in.args[0].size = sizeof(*arg); | |
506 | req->in.args[0].value = arg; | |
507 | req->out.numargs = 1; | |
508 | /* Variable length arguement used for backward compatibility | |
509 | with interface version < 7.5. Rest of init_out is zeroed | |
510 | by do_get_request(), so a short reply is not a problem */ | |
511 | req->out.argvar = 1; | |
512 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
513 | req->out.args[0].value = &req->misc.init_out; | |
514 | req->end = process_init_reply; | |
515 | request_send_background(fc, req); | |
516 | } | |
517 | ||
bafa9654 | 518 | static u64 conn_id(void) |
f543f253 | 519 | { |
bafa9654 | 520 | static u64 ctr = 1; |
0720b315 | 521 | return ctr++; |
f543f253 MS |
522 | } |
523 | ||
d8a5ba45 MS |
524 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
525 | { | |
526 | struct fuse_conn *fc; | |
527 | struct inode *root; | |
528 | struct fuse_mount_data d; | |
529 | struct file *file; | |
f543f253 | 530 | struct dentry *root_dentry; |
ce1d5a49 | 531 | struct fuse_req *init_req; |
d8a5ba45 | 532 | int err; |
d8091614 | 533 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 534 | |
71421259 MS |
535 | if (sb->s_flags & MS_MANDLOCK) |
536 | return -EINVAL; | |
537 | ||
d8091614 | 538 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
d8a5ba45 MS |
539 | return -EINVAL; |
540 | ||
d8091614 | 541 | if (is_bdev) { |
875d95ec | 542 | #ifdef CONFIG_BLOCK |
d8091614 MS |
543 | if (!sb_set_blocksize(sb, d.blksize)) |
544 | return -EINVAL; | |
875d95ec | 545 | #endif |
d8091614 MS |
546 | } else { |
547 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
548 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
549 | } | |
d8a5ba45 MS |
550 | sb->s_magic = FUSE_SUPER_MAGIC; |
551 | sb->s_op = &fuse_super_operations; | |
552 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
553 | ||
554 | file = fget(d.fd); | |
555 | if (!file) | |
556 | return -EINVAL; | |
557 | ||
0720b315 MS |
558 | if (file->f_op != &fuse_dev_operations) |
559 | return -EINVAL; | |
560 | ||
0720b315 MS |
561 | fc = new_conn(); |
562 | if (!fc) | |
563 | return -ENOMEM; | |
d8a5ba45 | 564 | |
1e9a4ed9 | 565 | fc->flags = d.flags; |
d8a5ba45 | 566 | fc->user_id = d.user_id; |
87729a55 | 567 | fc->group_id = d.group_id; |
db50b96c | 568 | fc->max_read = d.max_read; |
d8a5ba45 | 569 | |
f543f253 MS |
570 | /* Used by get_root_inode() */ |
571 | sb->s_fs_info = fc; | |
572 | ||
d8a5ba45 MS |
573 | err = -ENOMEM; |
574 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 575 | if (!root) |
d8a5ba45 MS |
576 | goto err; |
577 | ||
f543f253 MS |
578 | root_dentry = d_alloc_root(root); |
579 | if (!root_dentry) { | |
d8a5ba45 MS |
580 | iput(root); |
581 | goto err; | |
582 | } | |
f543f253 | 583 | |
ce1d5a49 MS |
584 | init_req = fuse_request_alloc(); |
585 | if (!init_req) | |
586 | goto err_put_root; | |
587 | ||
0ec7ca41 MS |
588 | if (is_bdev) { |
589 | fc->destroy_req = fuse_request_alloc(); | |
590 | if (!fc->destroy_req) | |
591 | goto err_put_root; | |
592 | } | |
593 | ||
bafa9654 | 594 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
595 | err = -EINVAL; |
596 | if (file->private_data) | |
bafa9654 | 597 | goto err_unlock; |
8aa09a50 | 598 | |
bafa9654 MS |
599 | fc->id = conn_id(); |
600 | err = fuse_ctl_add_conn(fc); | |
601 | if (err) | |
602 | goto err_unlock; | |
603 | ||
604 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 605 | sb->s_root = root_dentry; |
f543f253 | 606 | fc->connected = 1; |
bafa9654 MS |
607 | file->private_data = fuse_conn_get(fc); |
608 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
609 | /* |
610 | * atomic_dec_and_test() in fput() provides the necessary | |
611 | * memory barrier for file->private_data to be visible on all | |
612 | * CPUs after this | |
613 | */ | |
614 | fput(file); | |
f543f253 | 615 | |
ce1d5a49 | 616 | fuse_send_init(fc, init_req); |
f543f253 | 617 | |
d8a5ba45 MS |
618 | return 0; |
619 | ||
bafa9654 MS |
620 | err_unlock: |
621 | mutex_unlock(&fuse_mutex); | |
ce1d5a49 | 622 | fuse_request_free(init_req); |
f543f253 MS |
623 | err_put_root: |
624 | dput(root_dentry); | |
d8a5ba45 | 625 | err: |
0720b315 | 626 | fput(file); |
bafa9654 | 627 | fuse_conn_put(fc); |
d8a5ba45 MS |
628 | return err; |
629 | } | |
630 | ||
454e2398 DH |
631 | static int fuse_get_sb(struct file_system_type *fs_type, |
632 | int flags, const char *dev_name, | |
633 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 634 | { |
454e2398 | 635 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
636 | } |
637 | ||
875d95ec MS |
638 | static struct file_system_type fuse_fs_type = { |
639 | .owner = THIS_MODULE, | |
640 | .name = "fuse", | |
79c0b2df | 641 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec MS |
642 | .get_sb = fuse_get_sb, |
643 | .kill_sb = kill_anon_super, | |
644 | }; | |
645 | ||
646 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
647 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
648 | int flags, const char *dev_name, | |
649 | void *raw_data, struct vfsmount *mnt) | |
650 | { | |
651 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
652 | mnt); | |
653 | } | |
654 | ||
d6392f87 MS |
655 | static struct file_system_type fuseblk_fs_type = { |
656 | .owner = THIS_MODULE, | |
657 | .name = "fuseblk", | |
658 | .get_sb = fuse_get_sb_blk, | |
659 | .kill_sb = kill_block_super, | |
edad01e2 | 660 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
661 | }; |
662 | ||
875d95ec MS |
663 | static inline int register_fuseblk(void) |
664 | { | |
665 | return register_filesystem(&fuseblk_fs_type); | |
666 | } | |
667 | ||
668 | static inline void unregister_fuseblk(void) | |
669 | { | |
670 | unregister_filesystem(&fuseblk_fs_type); | |
671 | } | |
672 | #else | |
673 | static inline int register_fuseblk(void) | |
674 | { | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static inline void unregister_fuseblk(void) | |
679 | { | |
680 | } | |
681 | #endif | |
682 | ||
f543f253 | 683 | static decl_subsys(fuse, NULL, NULL); |
bafa9654 | 684 | static decl_subsys(connections, NULL, NULL); |
f543f253 | 685 | |
e18b890b | 686 | static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep, |
d8a5ba45 MS |
687 | unsigned long flags) |
688 | { | |
689 | struct inode * inode = foo; | |
690 | ||
a35afb83 | 691 | inode_init_once(inode); |
d8a5ba45 MS |
692 | } |
693 | ||
694 | static int __init fuse_fs_init(void) | |
695 | { | |
696 | int err; | |
697 | ||
698 | err = register_filesystem(&fuse_fs_type); | |
699 | if (err) | |
d6392f87 MS |
700 | goto out; |
701 | ||
875d95ec | 702 | err = register_fuseblk(); |
d6392f87 MS |
703 | if (err) |
704 | goto out_unreg; | |
705 | ||
706 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
707 | sizeof(struct fuse_inode), | |
708 | 0, SLAB_HWCACHE_ALIGN, | |
709 | fuse_inode_init_once, NULL); | |
710 | err = -ENOMEM; | |
711 | if (!fuse_inode_cachep) | |
712 | goto out_unreg2; | |
713 | ||
714 | return 0; | |
d8a5ba45 | 715 | |
d6392f87 | 716 | out_unreg2: |
875d95ec | 717 | unregister_fuseblk(); |
d6392f87 MS |
718 | out_unreg: |
719 | unregister_filesystem(&fuse_fs_type); | |
720 | out: | |
d8a5ba45 MS |
721 | return err; |
722 | } | |
723 | ||
724 | static void fuse_fs_cleanup(void) | |
725 | { | |
726 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 727 | unregister_fuseblk(); |
d8a5ba45 MS |
728 | kmem_cache_destroy(fuse_inode_cachep); |
729 | } | |
730 | ||
f543f253 MS |
731 | static int fuse_sysfs_init(void) |
732 | { | |
733 | int err; | |
734 | ||
823bccfc | 735 | kobj_set_kset_s(&fuse_subsys, fs_subsys); |
f543f253 MS |
736 | err = subsystem_register(&fuse_subsys); |
737 | if (err) | |
738 | goto out_err; | |
739 | ||
823bccfc | 740 | kobj_set_kset_s(&connections_subsys, fuse_subsys); |
f543f253 MS |
741 | err = subsystem_register(&connections_subsys); |
742 | if (err) | |
743 | goto out_fuse_unregister; | |
744 | ||
745 | return 0; | |
746 | ||
747 | out_fuse_unregister: | |
748 | subsystem_unregister(&fuse_subsys); | |
749 | out_err: | |
750 | return err; | |
751 | } | |
752 | ||
753 | static void fuse_sysfs_cleanup(void) | |
754 | { | |
755 | subsystem_unregister(&connections_subsys); | |
756 | subsystem_unregister(&fuse_subsys); | |
757 | } | |
758 | ||
d8a5ba45 MS |
759 | static int __init fuse_init(void) |
760 | { | |
761 | int res; | |
762 | ||
763 | printk("fuse init (API version %i.%i)\n", | |
764 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
765 | ||
bafa9654 | 766 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
767 | res = fuse_fs_init(); |
768 | if (res) | |
769 | goto err; | |
770 | ||
334f485d MS |
771 | res = fuse_dev_init(); |
772 | if (res) | |
773 | goto err_fs_cleanup; | |
774 | ||
f543f253 MS |
775 | res = fuse_sysfs_init(); |
776 | if (res) | |
777 | goto err_dev_cleanup; | |
778 | ||
bafa9654 MS |
779 | res = fuse_ctl_init(); |
780 | if (res) | |
781 | goto err_sysfs_cleanup; | |
782 | ||
d8a5ba45 MS |
783 | return 0; |
784 | ||
bafa9654 MS |
785 | err_sysfs_cleanup: |
786 | fuse_sysfs_cleanup(); | |
f543f253 MS |
787 | err_dev_cleanup: |
788 | fuse_dev_cleanup(); | |
334f485d MS |
789 | err_fs_cleanup: |
790 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
791 | err: |
792 | return res; | |
793 | } | |
794 | ||
795 | static void __exit fuse_exit(void) | |
796 | { | |
797 | printk(KERN_DEBUG "fuse exit\n"); | |
798 | ||
bafa9654 | 799 | fuse_ctl_cleanup(); |
f543f253 | 800 | fuse_sysfs_cleanup(); |
d8a5ba45 | 801 | fuse_fs_cleanup(); |
334f485d | 802 | fuse_dev_cleanup(); |
d8a5ba45 MS |
803 | } |
804 | ||
805 | module_init(fuse_init); | |
806 | module_exit(fuse_exit); |