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