]>
Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
d7133114 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
d8a5ba45 MS |
17 | #include <linux/parser.h> |
18 | #include <linux/statfs.h> | |
9c8ef561 | 19 | #include <linux/random.h> |
e8edc6e0 | 20 | #include <linux/sched.h> |
d8a5ba45 MS |
21 | |
22 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
23 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
e18b890b | 26 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
27 | struct list_head fuse_conn_list; |
28 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 MS |
29 | |
30 | #define FUSE_SUPER_MAGIC 0x65735546 | |
31 | ||
d1875dba MS |
32 | #define FUSE_DEFAULT_BLKSIZE 512 |
33 | ||
d8a5ba45 MS |
34 | struct fuse_mount_data { |
35 | int fd; | |
36 | unsigned rootmode; | |
37 | unsigned user_id; | |
87729a55 | 38 | unsigned group_id; |
5a533682 MS |
39 | unsigned fd_present : 1; |
40 | unsigned rootmode_present : 1; | |
41 | unsigned user_id_present : 1; | |
42 | unsigned group_id_present : 1; | |
1e9a4ed9 | 43 | unsigned flags; |
db50b96c | 44 | unsigned max_read; |
d8091614 | 45 | unsigned blksize; |
d8a5ba45 MS |
46 | }; |
47 | ||
48 | static struct inode *fuse_alloc_inode(struct super_block *sb) | |
49 | { | |
50 | struct inode *inode; | |
51 | struct fuse_inode *fi; | |
52 | ||
e94b1766 | 53 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
54 | if (!inode) |
55 | return NULL; | |
56 | ||
57 | fi = get_fuse_inode(inode); | |
0a0898cf | 58 | fi->i_time = 0; |
d8a5ba45 | 59 | fi->nodeid = 0; |
9e6268db | 60 | fi->nlookup = 0; |
fbee36b9 | 61 | fi->attr_version = 0; |
3be5a52b | 62 | fi->writectr = 0; |
93a8c3cd | 63 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
64 | INIT_LIST_HEAD(&fi->queued_writes); |
65 | INIT_LIST_HEAD(&fi->writepages); | |
66 | init_waitqueue_head(&fi->page_waitq); | |
e5e5558e MS |
67 | fi->forget_req = fuse_request_alloc(); |
68 | if (!fi->forget_req) { | |
69 | kmem_cache_free(fuse_inode_cachep, inode); | |
70 | return NULL; | |
71 | } | |
d8a5ba45 MS |
72 | |
73 | return inode; | |
74 | } | |
75 | ||
76 | static void fuse_destroy_inode(struct inode *inode) | |
77 | { | |
e5e5558e | 78 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 79 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 80 | BUG_ON(!list_empty(&fi->queued_writes)); |
e5e5558e MS |
81 | if (fi->forget_req) |
82 | fuse_request_free(fi->forget_req); | |
d8a5ba45 MS |
83 | kmem_cache_free(fuse_inode_cachep, inode); |
84 | } | |
85 | ||
e5e5558e | 86 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
b48badf0 | 87 | u64 nodeid, u64 nlookup) |
e5e5558e MS |
88 | { |
89 | struct fuse_forget_in *inarg = &req->misc.forget_in; | |
9e6268db | 90 | inarg->nlookup = nlookup; |
e5e5558e MS |
91 | req->in.h.opcode = FUSE_FORGET; |
92 | req->in.h.nodeid = nodeid; | |
93 | req->in.numargs = 1; | |
94 | req->in.args[0].size = sizeof(struct fuse_forget_in); | |
95 | req->in.args[0].value = inarg; | |
96 | request_send_noreply(fc, req); | |
97 | } | |
98 | ||
d8a5ba45 MS |
99 | static void fuse_clear_inode(struct inode *inode) |
100 | { | |
1e9a4ed9 MS |
101 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
102 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 103 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 104 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
e5e5558e MS |
105 | fi->forget_req = NULL; |
106 | } | |
d8a5ba45 MS |
107 | } |
108 | ||
71421259 MS |
109 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
110 | { | |
111 | if (*flags & MS_MANDLOCK) | |
112 | return -EINVAL; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
3be5a52b | 117 | void fuse_truncate(struct address_space *mapping, loff_t offset) |
e00d2c2d MS |
118 | { |
119 | /* See vmtruncate() */ | |
120 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
121 | truncate_inode_pages(mapping, offset); | |
122 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
123 | } | |
124 | ||
3be5a52b MS |
125 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
126 | u64 attr_valid) | |
d8a5ba45 | 127 | { |
9ffbb916 | 128 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 129 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 130 | |
1fb69e78 MS |
131 | fi->attr_version = ++fc->attr_version; |
132 | fi->i_time = attr_valid; | |
133 | ||
d8a5ba45 | 134 | inode->i_ino = attr->ino; |
ebc14c4d | 135 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
d8a5ba45 MS |
136 | inode->i_nlink = attr->nlink; |
137 | inode->i_uid = attr->uid; | |
138 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
139 | inode->i_blocks = attr->blocks; |
140 | inode->i_atime.tv_sec = attr->atime; | |
141 | inode->i_atime.tv_nsec = attr->atimensec; | |
142 | inode->i_mtime.tv_sec = attr->mtime; | |
143 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
144 | inode->i_ctime.tv_sec = attr->ctime; | |
145 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 146 | |
0e9663ee MS |
147 | if (attr->blksize != 0) |
148 | inode->i_blkbits = ilog2(attr->blksize); | |
149 | else | |
150 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
151 | ||
ebc14c4d MS |
152 | /* |
153 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
154 | * to check permissions. This prevents failures due to the | |
155 | * check in may_delete(). | |
156 | */ | |
157 | fi->orig_i_mode = inode->i_mode; | |
158 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
159 | inode->i_mode &= ~S_ISVTX; | |
3be5a52b MS |
160 | } |
161 | ||
162 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
163 | u64 attr_valid, u64 attr_version) | |
164 | { | |
165 | struct fuse_conn *fc = get_fuse_conn(inode); | |
166 | struct fuse_inode *fi = get_fuse_inode(inode); | |
167 | loff_t oldsize; | |
168 | ||
169 | spin_lock(&fc->lock); | |
170 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
171 | spin_unlock(&fc->lock); | |
172 | return; | |
173 | } | |
174 | ||
175 | fuse_change_attributes_common(inode, attr, attr_valid); | |
ebc14c4d | 176 | |
e00d2c2d MS |
177 | oldsize = inode->i_size; |
178 | i_size_write(inode, attr->size); | |
179 | spin_unlock(&fc->lock); | |
180 | ||
181 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
182 | if (attr->size < oldsize) | |
183 | fuse_truncate(inode->i_mapping, attr->size); | |
b1009979 | 184 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 185 | } |
d8a5ba45 MS |
186 | } |
187 | ||
188 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
189 | { | |
190 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 191 | inode->i_size = attr->size; |
e5e5558e MS |
192 | if (S_ISREG(inode->i_mode)) { |
193 | fuse_init_common(inode); | |
b6aeaded | 194 | fuse_init_file_inode(inode); |
e5e5558e MS |
195 | } else if (S_ISDIR(inode->i_mode)) |
196 | fuse_init_dir(inode); | |
197 | else if (S_ISLNK(inode->i_mode)) | |
198 | fuse_init_symlink(inode); | |
199 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
200 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
201 | fuse_init_common(inode); | |
202 | init_special_inode(inode, inode->i_mode, | |
203 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
204 | } else |
205 | BUG(); | |
d8a5ba45 MS |
206 | } |
207 | ||
208 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) | |
209 | { | |
b48badf0 | 210 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
211 | if (get_node_id(inode) == nodeid) |
212 | return 1; | |
213 | else | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
218 | { | |
b48badf0 | 219 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
220 | get_fuse_inode(inode)->nodeid = nodeid; |
221 | return 0; | |
222 | } | |
223 | ||
b48badf0 | 224 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
225 | int generation, struct fuse_attr *attr, |
226 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
227 | { |
228 | struct inode *inode; | |
9e6268db | 229 | struct fuse_inode *fi; |
d8a5ba45 | 230 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
231 | |
232 | retry: | |
233 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
234 | if (!inode) | |
235 | return NULL; | |
236 | ||
237 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 238 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
239 | inode->i_generation = generation; |
240 | inode->i_data.backing_dev_info = &fc->bdi; | |
241 | fuse_init_inode(inode, attr); | |
242 | unlock_new_inode(inode); | |
243 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
244 | /* Inode has changed type, any I/O on the old should fail */ |
245 | make_bad_inode(inode); | |
246 | iput(inode); | |
d8a5ba45 MS |
247 | goto retry; |
248 | } | |
249 | ||
9e6268db | 250 | fi = get_fuse_inode(inode); |
8da5ff23 | 251 | spin_lock(&fc->lock); |
9e6268db | 252 | fi->nlookup ++; |
8da5ff23 | 253 | spin_unlock(&fc->lock); |
1fb69e78 MS |
254 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
255 | ||
d8a5ba45 MS |
256 | return inode; |
257 | } | |
258 | ||
42faad99 | 259 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 260 | { |
42faad99 | 261 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
262 | } |
263 | ||
0ec7ca41 MS |
264 | static void fuse_send_destroy(struct fuse_conn *fc) |
265 | { | |
266 | struct fuse_req *req = fc->destroy_req; | |
267 | if (req && fc->conn_init) { | |
268 | fc->destroy_req = NULL; | |
269 | req->in.h.opcode = FUSE_DESTROY; | |
270 | req->force = 1; | |
271 | request_send(fc, req); | |
272 | fuse_put_request(fc, req); | |
273 | } | |
274 | } | |
275 | ||
d8a5ba45 MS |
276 | static void fuse_put_super(struct super_block *sb) |
277 | { | |
278 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
279 | ||
0ec7ca41 | 280 | fuse_send_destroy(fc); |
d7133114 | 281 | spin_lock(&fc->lock); |
9ba7cbba | 282 | fc->connected = 0; |
51eb01e7 | 283 | fc->blocked = 0; |
d7133114 | 284 | spin_unlock(&fc->lock); |
334f485d | 285 | /* Flush all readers on this fs */ |
385a17bf | 286 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 287 | wake_up_all(&fc->waitq); |
51eb01e7 | 288 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 289 | wake_up_all(&fc->reserved_req_waitq); |
bafa9654 MS |
290 | mutex_lock(&fuse_mutex); |
291 | list_del(&fc->entry); | |
292 | fuse_ctl_remove_conn(fc); | |
293 | mutex_unlock(&fuse_mutex); | |
294 | fuse_conn_put(fc); | |
d8a5ba45 MS |
295 | } |
296 | ||
e5e5558e MS |
297 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
298 | { | |
299 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
300 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 301 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
302 | stbuf->f_blocks = attr->blocks; |
303 | stbuf->f_bfree = attr->bfree; | |
304 | stbuf->f_bavail = attr->bavail; | |
305 | stbuf->f_files = attr->files; | |
306 | stbuf->f_ffree = attr->ffree; | |
307 | stbuf->f_namelen = attr->namelen; | |
308 | /* fsid is left zero */ | |
309 | } | |
310 | ||
726c3342 | 311 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 312 | { |
726c3342 | 313 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
314 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
315 | struct fuse_req *req; | |
316 | struct fuse_statfs_out outarg; | |
317 | int err; | |
318 | ||
e57ac683 MS |
319 | if (!fuse_allow_task(fc, current)) { |
320 | buf->f_type = FUSE_SUPER_MAGIC; | |
321 | return 0; | |
322 | } | |
323 | ||
ce1d5a49 MS |
324 | req = fuse_get_req(fc); |
325 | if (IS_ERR(req)) | |
326 | return PTR_ERR(req); | |
e5e5558e | 327 | |
de5f1202 | 328 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
329 | req->in.numargs = 0; |
330 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 331 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 332 | req->out.numargs = 1; |
de5f1202 MS |
333 | req->out.args[0].size = |
334 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e MS |
335 | req->out.args[0].value = &outarg; |
336 | request_send(fc, req); | |
337 | err = req->out.h.error; | |
338 | if (!err) | |
339 | convert_fuse_statfs(buf, &outarg.st); | |
340 | fuse_put_request(fc, req); | |
341 | return err; | |
342 | } | |
343 | ||
d8a5ba45 MS |
344 | enum { |
345 | OPT_FD, | |
346 | OPT_ROOTMODE, | |
347 | OPT_USER_ID, | |
87729a55 | 348 | OPT_GROUP_ID, |
d8a5ba45 MS |
349 | OPT_DEFAULT_PERMISSIONS, |
350 | OPT_ALLOW_OTHER, | |
db50b96c | 351 | OPT_MAX_READ, |
d8091614 | 352 | OPT_BLKSIZE, |
d8a5ba45 MS |
353 | OPT_ERR |
354 | }; | |
355 | ||
356 | static match_table_t tokens = { | |
357 | {OPT_FD, "fd=%u"}, | |
358 | {OPT_ROOTMODE, "rootmode=%o"}, | |
359 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 360 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
361 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
362 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 363 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 364 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
365 | {OPT_ERR, NULL} |
366 | }; | |
367 | ||
d8091614 | 368 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
369 | { |
370 | char *p; | |
371 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 372 | d->max_read = ~0; |
d1875dba | 373 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
374 | |
375 | while ((p = strsep(&opt, ",")) != NULL) { | |
376 | int token; | |
377 | int value; | |
378 | substring_t args[MAX_OPT_ARGS]; | |
379 | if (!*p) | |
380 | continue; | |
381 | ||
382 | token = match_token(p, tokens, args); | |
383 | switch (token) { | |
384 | case OPT_FD: | |
385 | if (match_int(&args[0], &value)) | |
386 | return 0; | |
387 | d->fd = value; | |
5a533682 | 388 | d->fd_present = 1; |
d8a5ba45 MS |
389 | break; |
390 | ||
391 | case OPT_ROOTMODE: | |
392 | if (match_octal(&args[0], &value)) | |
393 | return 0; | |
a5bfffac TS |
394 | if (!fuse_valid_type(value)) |
395 | return 0; | |
d8a5ba45 | 396 | d->rootmode = value; |
5a533682 | 397 | d->rootmode_present = 1; |
d8a5ba45 MS |
398 | break; |
399 | ||
400 | case OPT_USER_ID: | |
401 | if (match_int(&args[0], &value)) | |
402 | return 0; | |
403 | d->user_id = value; | |
5a533682 | 404 | d->user_id_present = 1; |
d8a5ba45 MS |
405 | break; |
406 | ||
87729a55 MS |
407 | case OPT_GROUP_ID: |
408 | if (match_int(&args[0], &value)) | |
409 | return 0; | |
410 | d->group_id = value; | |
5a533682 | 411 | d->group_id_present = 1; |
87729a55 MS |
412 | break; |
413 | ||
1e9a4ed9 MS |
414 | case OPT_DEFAULT_PERMISSIONS: |
415 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
416 | break; | |
417 | ||
418 | case OPT_ALLOW_OTHER: | |
419 | d->flags |= FUSE_ALLOW_OTHER; | |
420 | break; | |
421 | ||
db50b96c MS |
422 | case OPT_MAX_READ: |
423 | if (match_int(&args[0], &value)) | |
424 | return 0; | |
425 | d->max_read = value; | |
426 | break; | |
427 | ||
d8091614 MS |
428 | case OPT_BLKSIZE: |
429 | if (!is_bdev || match_int(&args[0], &value)) | |
430 | return 0; | |
431 | d->blksize = value; | |
432 | break; | |
433 | ||
d8a5ba45 MS |
434 | default: |
435 | return 0; | |
436 | } | |
437 | } | |
5a533682 MS |
438 | |
439 | if (!d->fd_present || !d->rootmode_present || | |
440 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
441 | return 0; |
442 | ||
443 | return 1; | |
444 | } | |
445 | ||
446 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
447 | { | |
448 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
449 | ||
450 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 451 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
452 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
453 | seq_puts(m, ",default_permissions"); | |
454 | if (fc->flags & FUSE_ALLOW_OTHER) | |
455 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
456 | if (fc->max_read != ~0) |
457 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d1875dba MS |
458 | if (mnt->mnt_sb->s_bdev && |
459 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
460 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); | |
d8a5ba45 MS |
461 | return 0; |
462 | } | |
463 | ||
b6f2fcbc | 464 | static struct fuse_conn *new_conn(struct super_block *sb) |
d8a5ba45 MS |
465 | { |
466 | struct fuse_conn *fc; | |
e0bf68dd | 467 | int err; |
d8a5ba45 | 468 | |
6383bdaa | 469 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
f543f253 | 470 | if (fc) { |
d7133114 | 471 | spin_lock_init(&fc->lock); |
d2a85164 | 472 | mutex_init(&fc->inst_mutex); |
bafa9654 | 473 | atomic_set(&fc->count, 1); |
334f485d | 474 | init_waitqueue_head(&fc->waitq); |
08a53cdc | 475 | init_waitqueue_head(&fc->blocked_waitq); |
de5e3dec | 476 | init_waitqueue_head(&fc->reserved_req_waitq); |
334f485d MS |
477 | INIT_LIST_HEAD(&fc->pending); |
478 | INIT_LIST_HEAD(&fc->processing); | |
d77a1d5b | 479 | INIT_LIST_HEAD(&fc->io); |
a4d27e75 | 480 | INIT_LIST_HEAD(&fc->interrupts); |
d12def1b | 481 | INIT_LIST_HEAD(&fc->bg_queue); |
095da6cb | 482 | atomic_set(&fc->num_waiting, 0); |
d8a5ba45 MS |
483 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
484 | fc->bdi.unplug_io_fn = default_unplug_io_fn; | |
3be5a52b MS |
485 | /* fuse does it's own writeback accounting */ |
486 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
b6f2fcbc | 487 | fc->dev = sb->s_dev; |
e0bf68dd | 488 | err = bdi_init(&fc->bdi); |
b6f2fcbc MS |
489 | if (err) |
490 | goto error_kfree; | |
03fb0bce MS |
491 | if (sb->s_bdev) { |
492 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
493 | MAJOR(fc->dev), MINOR(fc->dev)); | |
494 | } else { | |
495 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
496 | } | |
b6f2fcbc MS |
497 | if (err) |
498 | goto error_bdi_destroy; | |
3be5a52b MS |
499 | /* |
500 | * For a single fuse filesystem use max 1% of dirty + | |
501 | * writeback threshold. | |
502 | * | |
503 | * This gives about 1M of write buffer for memory maps on a | |
504 | * machine with 1G and 10% dirty_ratio, which should be more | |
505 | * than enough. | |
506 | * | |
507 | * Privileged users can raise it by writing to | |
508 | * | |
509 | * /sys/class/bdi/<bdi>/max_ratio | |
510 | */ | |
511 | bdi_set_max_ratio(&fc->bdi, 1); | |
334f485d | 512 | fc->reqctr = 0; |
08a53cdc | 513 | fc->blocked = 1; |
1fb69e78 | 514 | fc->attr_version = 1; |
9c8ef561 | 515 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
d8a5ba45 MS |
516 | } |
517 | return fc; | |
b6f2fcbc MS |
518 | |
519 | error_bdi_destroy: | |
520 | bdi_destroy(&fc->bdi); | |
521 | error_kfree: | |
522 | mutex_destroy(&fc->inst_mutex); | |
523 | kfree(fc); | |
524 | return NULL; | |
d8a5ba45 MS |
525 | } |
526 | ||
bafa9654 MS |
527 | void fuse_conn_put(struct fuse_conn *fc) |
528 | { | |
d2a85164 | 529 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
530 | if (fc->destroy_req) |
531 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 532 | mutex_destroy(&fc->inst_mutex); |
e0bf68dd | 533 | bdi_destroy(&fc->bdi); |
bafa9654 | 534 | kfree(fc); |
d2a85164 | 535 | } |
bafa9654 MS |
536 | } |
537 | ||
538 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
539 | { | |
540 | atomic_inc(&fc->count); | |
541 | return fc; | |
542 | } | |
543 | ||
d8a5ba45 MS |
544 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
545 | { | |
546 | struct fuse_attr attr; | |
547 | memset(&attr, 0, sizeof(attr)); | |
548 | ||
549 | attr.mode = mode; | |
550 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 551 | attr.nlink = 1; |
1fb69e78 | 552 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
553 | } |
554 | ||
ee9b6d61 | 555 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
556 | .alloc_inode = fuse_alloc_inode, |
557 | .destroy_inode = fuse_destroy_inode, | |
d8a5ba45 | 558 | .clear_inode = fuse_clear_inode, |
ead5f0b5 | 559 | .drop_inode = generic_delete_inode, |
71421259 | 560 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 561 | .put_super = fuse_put_super, |
69a53bf2 | 562 | .umount_begin = fuse_umount_begin, |
e5e5558e | 563 | .statfs = fuse_statfs, |
d8a5ba45 MS |
564 | .show_options = fuse_show_options, |
565 | }; | |
566 | ||
9b9a0469 MS |
567 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
568 | { | |
9b9a0469 MS |
569 | struct fuse_init_out *arg = &req->misc.init_out; |
570 | ||
571 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
572 | fc->conn_error = 1; | |
573 | else { | |
9cd68455 MS |
574 | unsigned long ra_pages; |
575 | ||
576 | if (arg->minor >= 6) { | |
577 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
578 | if (arg->flags & FUSE_ASYNC_READ) | |
579 | fc->async_read = 1; | |
71421259 MS |
580 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
581 | fc->no_lock = 1; | |
6ff958ed MS |
582 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
583 | fc->atomic_o_trunc = 1; | |
78bb6cb9 MS |
584 | if (arg->flags & FUSE_BIG_WRITES) |
585 | fc->big_writes = 1; | |
71421259 | 586 | } else { |
9cd68455 | 587 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 MS |
588 | fc->no_lock = 1; |
589 | } | |
9cd68455 MS |
590 | |
591 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
592 | fc->minor = arg->minor; |
593 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 594 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 595 | fc->conn_init = 1; |
9b9a0469 | 596 | } |
9b9a0469 | 597 | fuse_put_request(fc, req); |
08a53cdc MS |
598 | fc->blocked = 0; |
599 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
600 | } |
601 | ||
ce1d5a49 | 602 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 603 | { |
9b9a0469 | 604 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 605 | |
9b9a0469 MS |
606 | arg->major = FUSE_KERNEL_VERSION; |
607 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 608 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 MS |
609 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
610 | FUSE_BIG_WRITES; | |
9b9a0469 MS |
611 | req->in.h.opcode = FUSE_INIT; |
612 | req->in.numargs = 1; | |
613 | req->in.args[0].size = sizeof(*arg); | |
614 | req->in.args[0].value = arg; | |
615 | req->out.numargs = 1; | |
616 | /* Variable length arguement used for backward compatibility | |
617 | with interface version < 7.5. Rest of init_out is zeroed | |
618 | by do_get_request(), so a short reply is not a problem */ | |
619 | req->out.argvar = 1; | |
620 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
621 | req->out.args[0].value = &req->misc.init_out; | |
622 | req->end = process_init_reply; | |
623 | request_send_background(fc, req); | |
624 | } | |
625 | ||
d8a5ba45 MS |
626 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
627 | { | |
628 | struct fuse_conn *fc; | |
629 | struct inode *root; | |
630 | struct fuse_mount_data d; | |
631 | struct file *file; | |
f543f253 | 632 | struct dentry *root_dentry; |
ce1d5a49 | 633 | struct fuse_req *init_req; |
d8a5ba45 | 634 | int err; |
d8091614 | 635 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 636 | |
71421259 MS |
637 | if (sb->s_flags & MS_MANDLOCK) |
638 | return -EINVAL; | |
639 | ||
d8091614 | 640 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
d8a5ba45 MS |
641 | return -EINVAL; |
642 | ||
d8091614 | 643 | if (is_bdev) { |
875d95ec | 644 | #ifdef CONFIG_BLOCK |
d8091614 MS |
645 | if (!sb_set_blocksize(sb, d.blksize)) |
646 | return -EINVAL; | |
875d95ec | 647 | #endif |
d8091614 MS |
648 | } else { |
649 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
650 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
651 | } | |
d8a5ba45 MS |
652 | sb->s_magic = FUSE_SUPER_MAGIC; |
653 | sb->s_op = &fuse_super_operations; | |
654 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
655 | ||
656 | file = fget(d.fd); | |
657 | if (!file) | |
658 | return -EINVAL; | |
659 | ||
0720b315 MS |
660 | if (file->f_op != &fuse_dev_operations) |
661 | return -EINVAL; | |
662 | ||
b6f2fcbc | 663 | fc = new_conn(sb); |
0720b315 MS |
664 | if (!fc) |
665 | return -ENOMEM; | |
d8a5ba45 | 666 | |
1e9a4ed9 | 667 | fc->flags = d.flags; |
d8a5ba45 | 668 | fc->user_id = d.user_id; |
87729a55 | 669 | fc->group_id = d.group_id; |
f948d564 | 670 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 671 | |
f543f253 MS |
672 | /* Used by get_root_inode() */ |
673 | sb->s_fs_info = fc; | |
674 | ||
d8a5ba45 MS |
675 | err = -ENOMEM; |
676 | root = get_root_inode(sb, d.rootmode); | |
f543f253 | 677 | if (!root) |
d8a5ba45 MS |
678 | goto err; |
679 | ||
f543f253 MS |
680 | root_dentry = d_alloc_root(root); |
681 | if (!root_dentry) { | |
d8a5ba45 MS |
682 | iput(root); |
683 | goto err; | |
684 | } | |
f543f253 | 685 | |
ce1d5a49 MS |
686 | init_req = fuse_request_alloc(); |
687 | if (!init_req) | |
688 | goto err_put_root; | |
689 | ||
0ec7ca41 MS |
690 | if (is_bdev) { |
691 | fc->destroy_req = fuse_request_alloc(); | |
692 | if (!fc->destroy_req) | |
693 | goto err_put_root; | |
694 | } | |
695 | ||
bafa9654 | 696 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
697 | err = -EINVAL; |
698 | if (file->private_data) | |
bafa9654 | 699 | goto err_unlock; |
8aa09a50 | 700 | |
bafa9654 MS |
701 | err = fuse_ctl_add_conn(fc); |
702 | if (err) | |
703 | goto err_unlock; | |
704 | ||
705 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 706 | sb->s_root = root_dentry; |
f543f253 | 707 | fc->connected = 1; |
bafa9654 MS |
708 | file->private_data = fuse_conn_get(fc); |
709 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
710 | /* |
711 | * atomic_dec_and_test() in fput() provides the necessary | |
712 | * memory barrier for file->private_data to be visible on all | |
713 | * CPUs after this | |
714 | */ | |
715 | fput(file); | |
f543f253 | 716 | |
ce1d5a49 | 717 | fuse_send_init(fc, init_req); |
f543f253 | 718 | |
d8a5ba45 MS |
719 | return 0; |
720 | ||
bafa9654 MS |
721 | err_unlock: |
722 | mutex_unlock(&fuse_mutex); | |
ce1d5a49 | 723 | fuse_request_free(init_req); |
f543f253 MS |
724 | err_put_root: |
725 | dput(root_dentry); | |
d8a5ba45 | 726 | err: |
0720b315 | 727 | fput(file); |
bafa9654 | 728 | fuse_conn_put(fc); |
d8a5ba45 MS |
729 | return err; |
730 | } | |
731 | ||
454e2398 DH |
732 | static int fuse_get_sb(struct file_system_type *fs_type, |
733 | int flags, const char *dev_name, | |
734 | void *raw_data, struct vfsmount *mnt) | |
d8a5ba45 | 735 | { |
454e2398 | 736 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
d8a5ba45 MS |
737 | } |
738 | ||
875d95ec MS |
739 | static struct file_system_type fuse_fs_type = { |
740 | .owner = THIS_MODULE, | |
741 | .name = "fuse", | |
79c0b2df | 742 | .fs_flags = FS_HAS_SUBTYPE, |
875d95ec MS |
743 | .get_sb = fuse_get_sb, |
744 | .kill_sb = kill_anon_super, | |
745 | }; | |
746 | ||
747 | #ifdef CONFIG_BLOCK | |
d6392f87 MS |
748 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
749 | int flags, const char *dev_name, | |
750 | void *raw_data, struct vfsmount *mnt) | |
751 | { | |
752 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, | |
753 | mnt); | |
754 | } | |
755 | ||
d6392f87 MS |
756 | static struct file_system_type fuseblk_fs_type = { |
757 | .owner = THIS_MODULE, | |
758 | .name = "fuseblk", | |
759 | .get_sb = fuse_get_sb_blk, | |
760 | .kill_sb = kill_block_super, | |
edad01e2 | 761 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
762 | }; |
763 | ||
875d95ec MS |
764 | static inline int register_fuseblk(void) |
765 | { | |
766 | return register_filesystem(&fuseblk_fs_type); | |
767 | } | |
768 | ||
769 | static inline void unregister_fuseblk(void) | |
770 | { | |
771 | unregister_filesystem(&fuseblk_fs_type); | |
772 | } | |
773 | #else | |
774 | static inline int register_fuseblk(void) | |
775 | { | |
776 | return 0; | |
777 | } | |
778 | ||
779 | static inline void unregister_fuseblk(void) | |
780 | { | |
781 | } | |
782 | #endif | |
783 | ||
4ba9b9d0 | 784 | static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) |
d8a5ba45 MS |
785 | { |
786 | struct inode * inode = foo; | |
787 | ||
a35afb83 | 788 | inode_init_once(inode); |
d8a5ba45 MS |
789 | } |
790 | ||
791 | static int __init fuse_fs_init(void) | |
792 | { | |
793 | int err; | |
794 | ||
795 | err = register_filesystem(&fuse_fs_type); | |
796 | if (err) | |
d6392f87 MS |
797 | goto out; |
798 | ||
875d95ec | 799 | err = register_fuseblk(); |
d6392f87 MS |
800 | if (err) |
801 | goto out_unreg; | |
802 | ||
803 | fuse_inode_cachep = kmem_cache_create("fuse_inode", | |
804 | sizeof(struct fuse_inode), | |
805 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 806 | fuse_inode_init_once); |
d6392f87 MS |
807 | err = -ENOMEM; |
808 | if (!fuse_inode_cachep) | |
809 | goto out_unreg2; | |
810 | ||
811 | return 0; | |
d8a5ba45 | 812 | |
d6392f87 | 813 | out_unreg2: |
875d95ec | 814 | unregister_fuseblk(); |
d6392f87 MS |
815 | out_unreg: |
816 | unregister_filesystem(&fuse_fs_type); | |
817 | out: | |
d8a5ba45 MS |
818 | return err; |
819 | } | |
820 | ||
821 | static void fuse_fs_cleanup(void) | |
822 | { | |
823 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 824 | unregister_fuseblk(); |
d8a5ba45 MS |
825 | kmem_cache_destroy(fuse_inode_cachep); |
826 | } | |
827 | ||
5c89e17e GKH |
828 | static struct kobject *fuse_kobj; |
829 | static struct kobject *connections_kobj; | |
830 | ||
f543f253 MS |
831 | static int fuse_sysfs_init(void) |
832 | { | |
833 | int err; | |
834 | ||
00d26666 | 835 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
836 | if (!fuse_kobj) { |
837 | err = -ENOMEM; | |
f543f253 | 838 | goto out_err; |
5c89e17e | 839 | } |
f543f253 | 840 | |
5c89e17e GKH |
841 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
842 | if (!connections_kobj) { | |
843 | err = -ENOMEM; | |
f543f253 | 844 | goto out_fuse_unregister; |
5c89e17e | 845 | } |
f543f253 MS |
846 | |
847 | return 0; | |
848 | ||
849 | out_fuse_unregister: | |
197b12d6 | 850 | kobject_put(fuse_kobj); |
f543f253 MS |
851 | out_err: |
852 | return err; | |
853 | } | |
854 | ||
855 | static void fuse_sysfs_cleanup(void) | |
856 | { | |
197b12d6 GKH |
857 | kobject_put(connections_kobj); |
858 | kobject_put(fuse_kobj); | |
f543f253 MS |
859 | } |
860 | ||
d8a5ba45 MS |
861 | static int __init fuse_init(void) |
862 | { | |
863 | int res; | |
864 | ||
865 | printk("fuse init (API version %i.%i)\n", | |
866 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
867 | ||
bafa9654 | 868 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
869 | res = fuse_fs_init(); |
870 | if (res) | |
871 | goto err; | |
872 | ||
334f485d MS |
873 | res = fuse_dev_init(); |
874 | if (res) | |
875 | goto err_fs_cleanup; | |
876 | ||
f543f253 MS |
877 | res = fuse_sysfs_init(); |
878 | if (res) | |
879 | goto err_dev_cleanup; | |
880 | ||
bafa9654 MS |
881 | res = fuse_ctl_init(); |
882 | if (res) | |
883 | goto err_sysfs_cleanup; | |
884 | ||
d8a5ba45 MS |
885 | return 0; |
886 | ||
bafa9654 MS |
887 | err_sysfs_cleanup: |
888 | fuse_sysfs_cleanup(); | |
f543f253 MS |
889 | err_dev_cleanup: |
890 | fuse_dev_cleanup(); | |
334f485d MS |
891 | err_fs_cleanup: |
892 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
893 | err: |
894 | return res; | |
895 | } | |
896 | ||
897 | static void __exit fuse_exit(void) | |
898 | { | |
899 | printk(KERN_DEBUG "fuse exit\n"); | |
900 | ||
bafa9654 | 901 | fuse_ctl_cleanup(); |
f543f253 | 902 | fuse_sysfs_cleanup(); |
d8a5ba45 | 903 | fuse_fs_cleanup(); |
334f485d | 904 | fuse_dev_cleanup(); |
d8a5ba45 MS |
905 | } |
906 | ||
907 | module_init(fuse_init); | |
908 | module_exit(fuse_exit); |