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