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Commit | Line | Data |
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d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 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> | |
487ea5af | 17 | #include <linux/moduleparam.h> |
d8a5ba45 MS |
18 | #include <linux/parser.h> |
19 | #include <linux/statfs.h> | |
9c8ef561 | 20 | #include <linux/random.h> |
e8edc6e0 | 21 | #include <linux/sched.h> |
dbd561d2 | 22 | #include <linux/exportfs.h> |
d8a5ba45 MS |
23 | |
24 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
25 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
e18b890b | 28 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
29 | struct list_head fuse_conn_list; |
30 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 31 | |
487ea5af CH |
32 | static int set_global_limit(const char *val, struct kernel_param *kp); |
33 | ||
79a9d994 | 34 | unsigned max_user_bgreq; |
487ea5af CH |
35 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
36 | &max_user_bgreq, 0644); | |
37 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
38 | MODULE_PARM_DESC(max_user_bgreq, | |
39 | "Global limit for the maximum number of backgrounded requests an " | |
40 | "unprivileged user can set"); | |
41 | ||
79a9d994 | 42 | unsigned max_user_congthresh; |
487ea5af CH |
43 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
44 | &max_user_congthresh, 0644); | |
45 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
46 | MODULE_PARM_DESC(max_user_congthresh, | |
47 | "Global limit for the maximum congestion threshold an " | |
48 | "unprivileged user can set"); | |
49 | ||
d8a5ba45 MS |
50 | #define FUSE_SUPER_MAGIC 0x65735546 |
51 | ||
d1875dba MS |
52 | #define FUSE_DEFAULT_BLKSIZE 512 |
53 | ||
7a6d3c8b CH |
54 | /** Maximum number of outstanding background requests */ |
55 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
56 | ||
57 | /** Congestion starts at 75% of maximum */ | |
58 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
59 | ||
d8a5ba45 MS |
60 | struct fuse_mount_data { |
61 | int fd; | |
62 | unsigned rootmode; | |
63 | unsigned user_id; | |
87729a55 | 64 | unsigned group_id; |
1729a16c MS |
65 | unsigned fd_present:1; |
66 | unsigned rootmode_present:1; | |
67 | unsigned user_id_present:1; | |
68 | unsigned group_id_present:1; | |
1e9a4ed9 | 69 | unsigned flags; |
db50b96c | 70 | unsigned max_read; |
d8091614 | 71 | unsigned blksize; |
d8a5ba45 MS |
72 | }; |
73 | ||
a2daff68 | 74 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
75 | { |
76 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
77 | } | |
78 | ||
d8a5ba45 MS |
79 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
80 | { | |
81 | struct inode *inode; | |
82 | struct fuse_inode *fi; | |
83 | ||
e94b1766 | 84 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
85 | if (!inode) |
86 | return NULL; | |
87 | ||
88 | fi = get_fuse_inode(inode); | |
0a0898cf | 89 | fi->i_time = 0; |
d8a5ba45 | 90 | fi->nodeid = 0; |
9e6268db | 91 | fi->nlookup = 0; |
fbee36b9 | 92 | fi->attr_version = 0; |
3be5a52b | 93 | fi->writectr = 0; |
93a8c3cd | 94 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
95 | INIT_LIST_HEAD(&fi->queued_writes); |
96 | INIT_LIST_HEAD(&fi->writepages); | |
97 | init_waitqueue_head(&fi->page_waitq); | |
07e77dca MS |
98 | fi->forget = fuse_alloc_forget(); |
99 | if (!fi->forget) { | |
e5e5558e MS |
100 | kmem_cache_free(fuse_inode_cachep, inode); |
101 | return NULL; | |
102 | } | |
d8a5ba45 MS |
103 | |
104 | return inode; | |
105 | } | |
106 | ||
fa0d7e3d NP |
107 | static void fuse_i_callback(struct rcu_head *head) |
108 | { | |
109 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
110 | kmem_cache_free(fuse_inode_cachep, inode); |
111 | } | |
112 | ||
d8a5ba45 MS |
113 | static void fuse_destroy_inode(struct inode *inode) |
114 | { | |
e5e5558e | 115 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 116 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 117 | BUG_ON(!list_empty(&fi->queued_writes)); |
07e77dca | 118 | kfree(fi->forget); |
fa0d7e3d | 119 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
120 | } |
121 | ||
b57922d9 | 122 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 123 | { |
b57922d9 AV |
124 | truncate_inode_pages(&inode->i_data, 0); |
125 | end_writeback(inode); | |
1e9a4ed9 MS |
126 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
127 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 128 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
129 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
130 | fi->forget = NULL; | |
e5e5558e | 131 | } |
d8a5ba45 MS |
132 | } |
133 | ||
71421259 MS |
134 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
135 | { | |
136 | if (*flags & MS_MANDLOCK) | |
137 | return -EINVAL; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
3be5a52b MS |
142 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
143 | u64 attr_valid) | |
d8a5ba45 | 144 | { |
9ffbb916 | 145 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 146 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 147 | |
1fb69e78 MS |
148 | fi->attr_version = ++fc->attr_version; |
149 | fi->i_time = attr_valid; | |
150 | ||
d8a5ba45 | 151 | inode->i_ino = attr->ino; |
ebc14c4d | 152 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 153 | set_nlink(inode, attr->nlink); |
d8a5ba45 MS |
154 | inode->i_uid = attr->uid; |
155 | inode->i_gid = attr->gid; | |
d8a5ba45 MS |
156 | inode->i_blocks = attr->blocks; |
157 | inode->i_atime.tv_sec = attr->atime; | |
158 | inode->i_atime.tv_nsec = attr->atimensec; | |
159 | inode->i_mtime.tv_sec = attr->mtime; | |
160 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
161 | inode->i_ctime.tv_sec = attr->ctime; | |
162 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e00d2c2d | 163 | |
0e9663ee MS |
164 | if (attr->blksize != 0) |
165 | inode->i_blkbits = ilog2(attr->blksize); | |
166 | else | |
167 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
168 | ||
ebc14c4d MS |
169 | /* |
170 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
171 | * to check permissions. This prevents failures due to the | |
172 | * check in may_delete(). | |
173 | */ | |
174 | fi->orig_i_mode = inode->i_mode; | |
175 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
176 | inode->i_mode &= ~S_ISVTX; | |
3be5a52b MS |
177 | } |
178 | ||
179 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
180 | u64 attr_valid, u64 attr_version) | |
181 | { | |
182 | struct fuse_conn *fc = get_fuse_conn(inode); | |
183 | struct fuse_inode *fi = get_fuse_inode(inode); | |
184 | loff_t oldsize; | |
185 | ||
186 | spin_lock(&fc->lock); | |
187 | if (attr_version != 0 && fi->attr_version > attr_version) { | |
188 | spin_unlock(&fc->lock); | |
189 | return; | |
190 | } | |
191 | ||
192 | fuse_change_attributes_common(inode, attr, attr_valid); | |
ebc14c4d | 193 | |
e00d2c2d MS |
194 | oldsize = inode->i_size; |
195 | i_size_write(inode, attr->size); | |
196 | spin_unlock(&fc->lock); | |
197 | ||
198 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { | |
c08d3b0e | 199 | truncate_pagecache(inode, oldsize, attr->size); |
b1009979 | 200 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d | 201 | } |
d8a5ba45 MS |
202 | } |
203 | ||
204 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
205 | { | |
206 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 207 | inode->i_size = attr->size; |
e5e5558e MS |
208 | if (S_ISREG(inode->i_mode)) { |
209 | fuse_init_common(inode); | |
b6aeaded | 210 | fuse_init_file_inode(inode); |
e5e5558e MS |
211 | } else if (S_ISDIR(inode->i_mode)) |
212 | fuse_init_dir(inode); | |
213 | else if (S_ISLNK(inode->i_mode)) | |
214 | fuse_init_symlink(inode); | |
215 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
216 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
217 | fuse_init_common(inode); | |
218 | init_special_inode(inode, inode->i_mode, | |
219 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
220 | } else |
221 | BUG(); | |
d8a5ba45 MS |
222 | } |
223 | ||
3b463ae0 | 224 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 225 | { |
b48badf0 | 226 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
227 | if (get_node_id(inode) == nodeid) |
228 | return 1; | |
229 | else | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
234 | { | |
b48badf0 | 235 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
236 | get_fuse_inode(inode)->nodeid = nodeid; |
237 | return 0; | |
238 | } | |
239 | ||
b48badf0 | 240 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
241 | int generation, struct fuse_attr *attr, |
242 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
243 | { |
244 | struct inode *inode; | |
9e6268db | 245 | struct fuse_inode *fi; |
d8a5ba45 | 246 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
247 | |
248 | retry: | |
249 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
250 | if (!inode) | |
251 | return NULL; | |
252 | ||
253 | if ((inode->i_state & I_NEW)) { | |
b36c31ba | 254 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
d8a5ba45 MS |
255 | inode->i_generation = generation; |
256 | inode->i_data.backing_dev_info = &fc->bdi; | |
257 | fuse_init_inode(inode, attr); | |
258 | unlock_new_inode(inode); | |
259 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
260 | /* Inode has changed type, any I/O on the old should fail */ |
261 | make_bad_inode(inode); | |
262 | iput(inode); | |
d8a5ba45 MS |
263 | goto retry; |
264 | } | |
265 | ||
9e6268db | 266 | fi = get_fuse_inode(inode); |
8da5ff23 | 267 | spin_lock(&fc->lock); |
1729a16c | 268 | fi->nlookup++; |
8da5ff23 | 269 | spin_unlock(&fc->lock); |
1fb69e78 MS |
270 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
271 | ||
d8a5ba45 MS |
272 | return inode; |
273 | } | |
274 | ||
3b463ae0 JM |
275 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
276 | loff_t offset, loff_t len) | |
277 | { | |
278 | struct inode *inode; | |
279 | pgoff_t pg_start; | |
280 | pgoff_t pg_end; | |
281 | ||
282 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
283 | if (!inode) | |
284 | return -ENOENT; | |
285 | ||
286 | fuse_invalidate_attr(inode); | |
287 | if (offset >= 0) { | |
288 | pg_start = offset >> PAGE_CACHE_SHIFT; | |
289 | if (len <= 0) | |
290 | pg_end = -1; | |
291 | else | |
292 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
293 | invalidate_inode_pages2_range(inode->i_mapping, | |
294 | pg_start, pg_end); | |
295 | } | |
296 | iput(inode); | |
297 | return 0; | |
298 | } | |
299 | ||
42faad99 | 300 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 301 | { |
42faad99 | 302 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
303 | } |
304 | ||
0ec7ca41 MS |
305 | static void fuse_send_destroy(struct fuse_conn *fc) |
306 | { | |
307 | struct fuse_req *req = fc->destroy_req; | |
308 | if (req && fc->conn_init) { | |
309 | fc->destroy_req = NULL; | |
310 | req->in.h.opcode = FUSE_DESTROY; | |
311 | req->force = 1; | |
b93f858a | 312 | fuse_request_send(fc, req); |
0ec7ca41 MS |
313 | fuse_put_request(fc, req); |
314 | } | |
315 | } | |
316 | ||
a325f9b9 | 317 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 318 | { |
a325f9b9 TH |
319 | if (fc->bdi_initialized) |
320 | bdi_destroy(&fc->bdi); | |
321 | } | |
d8a5ba45 | 322 | |
08cbf542 | 323 | void fuse_conn_kill(struct fuse_conn *fc) |
a325f9b9 | 324 | { |
d7133114 | 325 | spin_lock(&fc->lock); |
9ba7cbba | 326 | fc->connected = 0; |
51eb01e7 | 327 | fc->blocked = 0; |
d7133114 | 328 | spin_unlock(&fc->lock); |
334f485d | 329 | /* Flush all readers on this fs */ |
385a17bf | 330 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
334f485d | 331 | wake_up_all(&fc->waitq); |
51eb01e7 | 332 | wake_up_all(&fc->blocked_waitq); |
de5e3dec | 333 | wake_up_all(&fc->reserved_req_waitq); |
bafa9654 MS |
334 | mutex_lock(&fuse_mutex); |
335 | list_del(&fc->entry); | |
336 | fuse_ctl_remove_conn(fc); | |
337 | mutex_unlock(&fuse_mutex); | |
a325f9b9 TH |
338 | fuse_bdi_destroy(fc); |
339 | } | |
08cbf542 | 340 | EXPORT_SYMBOL_GPL(fuse_conn_kill); |
a325f9b9 TH |
341 | |
342 | static void fuse_put_super(struct super_block *sb) | |
343 | { | |
344 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
345 | ||
346 | fuse_send_destroy(fc); | |
347 | fuse_conn_kill(fc); | |
bafa9654 | 348 | fuse_conn_put(fc); |
d8a5ba45 MS |
349 | } |
350 | ||
e5e5558e MS |
351 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
352 | { | |
353 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
354 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 355 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
356 | stbuf->f_blocks = attr->blocks; |
357 | stbuf->f_bfree = attr->bfree; | |
358 | stbuf->f_bavail = attr->bavail; | |
359 | stbuf->f_files = attr->files; | |
360 | stbuf->f_ffree = attr->ffree; | |
361 | stbuf->f_namelen = attr->namelen; | |
362 | /* fsid is left zero */ | |
363 | } | |
364 | ||
726c3342 | 365 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 366 | { |
726c3342 | 367 | struct super_block *sb = dentry->d_sb; |
e5e5558e MS |
368 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
369 | struct fuse_req *req; | |
370 | struct fuse_statfs_out outarg; | |
371 | int err; | |
372 | ||
e57ac683 MS |
373 | if (!fuse_allow_task(fc, current)) { |
374 | buf->f_type = FUSE_SUPER_MAGIC; | |
375 | return 0; | |
376 | } | |
377 | ||
ce1d5a49 MS |
378 | req = fuse_get_req(fc); |
379 | if (IS_ERR(req)) | |
380 | return PTR_ERR(req); | |
e5e5558e | 381 | |
de5f1202 | 382 | memset(&outarg, 0, sizeof(outarg)); |
e5e5558e MS |
383 | req->in.numargs = 0; |
384 | req->in.h.opcode = FUSE_STATFS; | |
5b35e8e5 | 385 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
e5e5558e | 386 | req->out.numargs = 1; |
de5f1202 MS |
387 | req->out.args[0].size = |
388 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); | |
e5e5558e | 389 | req->out.args[0].value = &outarg; |
b93f858a | 390 | fuse_request_send(fc, req); |
e5e5558e MS |
391 | err = req->out.h.error; |
392 | if (!err) | |
393 | convert_fuse_statfs(buf, &outarg.st); | |
394 | fuse_put_request(fc, req); | |
395 | return err; | |
396 | } | |
397 | ||
d8a5ba45 MS |
398 | enum { |
399 | OPT_FD, | |
400 | OPT_ROOTMODE, | |
401 | OPT_USER_ID, | |
87729a55 | 402 | OPT_GROUP_ID, |
d8a5ba45 MS |
403 | OPT_DEFAULT_PERMISSIONS, |
404 | OPT_ALLOW_OTHER, | |
db50b96c | 405 | OPT_MAX_READ, |
d8091614 | 406 | OPT_BLKSIZE, |
d8a5ba45 MS |
407 | OPT_ERR |
408 | }; | |
409 | ||
a447c093 | 410 | static const match_table_t tokens = { |
d8a5ba45 MS |
411 | {OPT_FD, "fd=%u"}, |
412 | {OPT_ROOTMODE, "rootmode=%o"}, | |
413 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 414 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
415 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
416 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 417 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 418 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
419 | {OPT_ERR, NULL} |
420 | }; | |
421 | ||
d8091614 | 422 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
423 | { |
424 | char *p; | |
425 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 426 | d->max_read = ~0; |
d1875dba | 427 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
428 | |
429 | while ((p = strsep(&opt, ",")) != NULL) { | |
430 | int token; | |
431 | int value; | |
432 | substring_t args[MAX_OPT_ARGS]; | |
433 | if (!*p) | |
434 | continue; | |
435 | ||
436 | token = match_token(p, tokens, args); | |
437 | switch (token) { | |
438 | case OPT_FD: | |
439 | if (match_int(&args[0], &value)) | |
440 | return 0; | |
441 | d->fd = value; | |
5a533682 | 442 | d->fd_present = 1; |
d8a5ba45 MS |
443 | break; |
444 | ||
445 | case OPT_ROOTMODE: | |
446 | if (match_octal(&args[0], &value)) | |
447 | return 0; | |
a5bfffac TS |
448 | if (!fuse_valid_type(value)) |
449 | return 0; | |
d8a5ba45 | 450 | d->rootmode = value; |
5a533682 | 451 | d->rootmode_present = 1; |
d8a5ba45 MS |
452 | break; |
453 | ||
454 | case OPT_USER_ID: | |
455 | if (match_int(&args[0], &value)) | |
456 | return 0; | |
457 | d->user_id = value; | |
5a533682 | 458 | d->user_id_present = 1; |
d8a5ba45 MS |
459 | break; |
460 | ||
87729a55 MS |
461 | case OPT_GROUP_ID: |
462 | if (match_int(&args[0], &value)) | |
463 | return 0; | |
464 | d->group_id = value; | |
5a533682 | 465 | d->group_id_present = 1; |
87729a55 MS |
466 | break; |
467 | ||
1e9a4ed9 MS |
468 | case OPT_DEFAULT_PERMISSIONS: |
469 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
470 | break; | |
471 | ||
472 | case OPT_ALLOW_OTHER: | |
473 | d->flags |= FUSE_ALLOW_OTHER; | |
474 | break; | |
475 | ||
db50b96c MS |
476 | case OPT_MAX_READ: |
477 | if (match_int(&args[0], &value)) | |
478 | return 0; | |
479 | d->max_read = value; | |
480 | break; | |
481 | ||
d8091614 MS |
482 | case OPT_BLKSIZE: |
483 | if (!is_bdev || match_int(&args[0], &value)) | |
484 | return 0; | |
485 | d->blksize = value; | |
486 | break; | |
487 | ||
d8a5ba45 MS |
488 | default: |
489 | return 0; | |
490 | } | |
491 | } | |
5a533682 MS |
492 | |
493 | if (!d->fd_present || !d->rootmode_present || | |
494 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
495 | return 0; |
496 | ||
497 | return 1; | |
498 | } | |
499 | ||
500 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) | |
501 | { | |
502 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); | |
503 | ||
504 | seq_printf(m, ",user_id=%u", fc->user_id); | |
87729a55 | 505 | seq_printf(m, ",group_id=%u", fc->group_id); |
1e9a4ed9 MS |
506 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
507 | seq_puts(m, ",default_permissions"); | |
508 | if (fc->flags & FUSE_ALLOW_OTHER) | |
509 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
510 | if (fc->max_read != ~0) |
511 | seq_printf(m, ",max_read=%u", fc->max_read); | |
d1875dba MS |
512 | if (mnt->mnt_sb->s_bdev && |
513 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) | |
514 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); | |
d8a5ba45 MS |
515 | return 0; |
516 | } | |
517 | ||
a325f9b9 | 518 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 519 | { |
0d179aa5 TH |
520 | memset(fc, 0, sizeof(*fc)); |
521 | spin_lock_init(&fc->lock); | |
522 | mutex_init(&fc->inst_mutex); | |
3b463ae0 | 523 | init_rwsem(&fc->killsb); |
0d179aa5 TH |
524 | atomic_set(&fc->count, 1); |
525 | init_waitqueue_head(&fc->waitq); | |
526 | init_waitqueue_head(&fc->blocked_waitq); | |
527 | init_waitqueue_head(&fc->reserved_req_waitq); | |
528 | INIT_LIST_HEAD(&fc->pending); | |
529 | INIT_LIST_HEAD(&fc->processing); | |
530 | INIT_LIST_HEAD(&fc->io); | |
531 | INIT_LIST_HEAD(&fc->interrupts); | |
532 | INIT_LIST_HEAD(&fc->bg_queue); | |
533 | INIT_LIST_HEAD(&fc->entry); | |
07e77dca | 534 | fc->forget_list_tail = &fc->forget_list_head; |
0d179aa5 | 535 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
536 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
537 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
538 | fc->khctr = 0; |
539 | fc->polled_files = RB_ROOT; | |
0d179aa5 TH |
540 | fc->reqctr = 0; |
541 | fc->blocked = 1; | |
542 | fc->attr_version = 1; | |
543 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 544 | } |
0d179aa5 | 545 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 546 | |
bafa9654 MS |
547 | void fuse_conn_put(struct fuse_conn *fc) |
548 | { | |
d2a85164 | 549 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
550 | if (fc->destroy_req) |
551 | fuse_request_free(fc->destroy_req); | |
d2a85164 | 552 | mutex_destroy(&fc->inst_mutex); |
43901aab | 553 | fc->release(fc); |
d2a85164 | 554 | } |
bafa9654 | 555 | } |
08cbf542 | 556 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
557 | |
558 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
559 | { | |
560 | atomic_inc(&fc->count); | |
561 | return fc; | |
562 | } | |
08cbf542 | 563 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 564 | |
b93f858a | 565 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
566 | { |
567 | struct fuse_attr attr; | |
568 | memset(&attr, 0, sizeof(attr)); | |
569 | ||
570 | attr.mode = mode; | |
571 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 572 | attr.nlink = 1; |
1fb69e78 | 573 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
574 | } |
575 | ||
1729a16c | 576 | struct fuse_inode_handle { |
dbd561d2 MS |
577 | u64 nodeid; |
578 | u32 generation; | |
579 | }; | |
580 | ||
581 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
582 | struct fuse_inode_handle *handle) | |
583 | { | |
33670fa2 | 584 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
585 | struct inode *inode; |
586 | struct dentry *entry; | |
587 | int err = -ESTALE; | |
588 | ||
589 | if (handle->nodeid == 0) | |
590 | goto out_err; | |
591 | ||
592 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
593 | if (!inode) { |
594 | struct fuse_entry_out outarg; | |
595 | struct qstr name; | |
596 | ||
597 | if (!fc->export_support) | |
598 | goto out_err; | |
599 | ||
600 | name.len = 1; | |
601 | name.name = "."; | |
602 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, | |
603 | &inode); | |
604 | if (err && err != -ENOENT) | |
605 | goto out_err; | |
606 | if (err || !inode) { | |
607 | err = -ESTALE; | |
608 | goto out_err; | |
609 | } | |
610 | err = -EIO; | |
611 | if (get_node_id(inode) != handle->nodeid) | |
612 | goto out_iput; | |
613 | } | |
dbd561d2 MS |
614 | err = -ESTALE; |
615 | if (inode->i_generation != handle->generation) | |
616 | goto out_iput; | |
617 | ||
44003728 | 618 | entry = d_obtain_alias(inode); |
c35eebe9 | 619 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 620 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
621 | |
622 | return entry; | |
623 | ||
624 | out_iput: | |
625 | iput(inode); | |
626 | out_err: | |
627 | return ERR_PTR(err); | |
628 | } | |
629 | ||
630 | static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, | |
631 | int connectable) | |
632 | { | |
633 | struct inode *inode = dentry->d_inode; | |
634 | bool encode_parent = connectable && !S_ISDIR(inode->i_mode); | |
635 | int len = encode_parent ? 6 : 3; | |
636 | u64 nodeid; | |
637 | u32 generation; | |
638 | ||
5fe0c237 AK |
639 | if (*max_len < len) { |
640 | *max_len = len; | |
dbd561d2 | 641 | return 255; |
5fe0c237 | 642 | } |
dbd561d2 MS |
643 | |
644 | nodeid = get_fuse_inode(inode)->nodeid; | |
645 | generation = inode->i_generation; | |
646 | ||
647 | fh[0] = (u32)(nodeid >> 32); | |
648 | fh[1] = (u32)(nodeid & 0xffffffff); | |
649 | fh[2] = generation; | |
650 | ||
651 | if (encode_parent) { | |
652 | struct inode *parent; | |
653 | ||
654 | spin_lock(&dentry->d_lock); | |
655 | parent = dentry->d_parent->d_inode; | |
656 | nodeid = get_fuse_inode(parent)->nodeid; | |
657 | generation = parent->i_generation; | |
658 | spin_unlock(&dentry->d_lock); | |
659 | ||
660 | fh[3] = (u32)(nodeid >> 32); | |
661 | fh[4] = (u32)(nodeid & 0xffffffff); | |
662 | fh[5] = generation; | |
663 | } | |
664 | ||
665 | *max_len = len; | |
666 | return encode_parent ? 0x82 : 0x81; | |
667 | } | |
668 | ||
669 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
670 | struct fid *fid, int fh_len, int fh_type) | |
671 | { | |
672 | struct fuse_inode_handle handle; | |
673 | ||
674 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
675 | return NULL; | |
676 | ||
677 | handle.nodeid = (u64) fid->raw[0] << 32; | |
678 | handle.nodeid |= (u64) fid->raw[1]; | |
679 | handle.generation = fid->raw[2]; | |
680 | return fuse_get_dentry(sb, &handle); | |
681 | } | |
682 | ||
683 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
684 | struct fid *fid, int fh_len, int fh_type) | |
685 | { | |
686 | struct fuse_inode_handle parent; | |
687 | ||
688 | if (fh_type != 0x82 || fh_len < 6) | |
689 | return NULL; | |
690 | ||
691 | parent.nodeid = (u64) fid->raw[3] << 32; | |
692 | parent.nodeid |= (u64) fid->raw[4]; | |
693 | parent.generation = fid->raw[5]; | |
694 | return fuse_get_dentry(sb, &parent); | |
695 | } | |
696 | ||
33670fa2 MS |
697 | static struct dentry *fuse_get_parent(struct dentry *child) |
698 | { | |
699 | struct inode *child_inode = child->d_inode; | |
700 | struct fuse_conn *fc = get_fuse_conn(child_inode); | |
701 | struct inode *inode; | |
702 | struct dentry *parent; | |
703 | struct fuse_entry_out outarg; | |
704 | struct qstr name; | |
705 | int err; | |
706 | ||
707 | if (!fc->export_support) | |
708 | return ERR_PTR(-ESTALE); | |
709 | ||
710 | name.len = 2; | |
711 | name.name = ".."; | |
712 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), | |
713 | &name, &outarg, &inode); | |
44003728 CH |
714 | if (err) { |
715 | if (err == -ENOENT) | |
716 | return ERR_PTR(-ESTALE); | |
33670fa2 | 717 | return ERR_PTR(err); |
33670fa2 | 718 | } |
44003728 CH |
719 | |
720 | parent = d_obtain_alias(inode); | |
c35eebe9 | 721 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 722 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
723 | |
724 | return parent; | |
725 | } | |
dbd561d2 MS |
726 | |
727 | static const struct export_operations fuse_export_operations = { | |
728 | .fh_to_dentry = fuse_fh_to_dentry, | |
729 | .fh_to_parent = fuse_fh_to_parent, | |
730 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 731 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
732 | }; |
733 | ||
ee9b6d61 | 734 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
735 | .alloc_inode = fuse_alloc_inode, |
736 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 737 | .evict_inode = fuse_evict_inode, |
ead5f0b5 | 738 | .drop_inode = generic_delete_inode, |
71421259 | 739 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 740 | .put_super = fuse_put_super, |
69a53bf2 | 741 | .umount_begin = fuse_umount_begin, |
e5e5558e | 742 | .statfs = fuse_statfs, |
d8a5ba45 MS |
743 | .show_options = fuse_show_options, |
744 | }; | |
745 | ||
487ea5af CH |
746 | static void sanitize_global_limit(unsigned *limit) |
747 | { | |
748 | if (*limit == 0) | |
749 | *limit = ((num_physpages << PAGE_SHIFT) >> 13) / | |
750 | sizeof(struct fuse_req); | |
751 | ||
752 | if (*limit >= 1 << 16) | |
753 | *limit = (1 << 16) - 1; | |
754 | } | |
755 | ||
756 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
757 | { | |
758 | int rv; | |
759 | ||
760 | rv = param_set_uint(val, kp); | |
761 | if (rv) | |
762 | return rv; | |
763 | ||
764 | sanitize_global_limit((unsigned *)kp->arg); | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
769 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
770 | { | |
771 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
772 | ||
773 | if (arg->minor < 13) | |
774 | return; | |
775 | ||
776 | sanitize_global_limit(&max_user_bgreq); | |
777 | sanitize_global_limit(&max_user_congthresh); | |
778 | ||
779 | if (arg->max_background) { | |
780 | fc->max_background = arg->max_background; | |
781 | ||
782 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
783 | fc->max_background = max_user_bgreq; | |
784 | } | |
785 | if (arg->congestion_threshold) { | |
786 | fc->congestion_threshold = arg->congestion_threshold; | |
787 | ||
788 | if (!cap_sys_admin && | |
789 | fc->congestion_threshold > max_user_congthresh) | |
790 | fc->congestion_threshold = max_user_congthresh; | |
791 | } | |
792 | } | |
793 | ||
9b9a0469 MS |
794 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
795 | { | |
9b9a0469 MS |
796 | struct fuse_init_out *arg = &req->misc.init_out; |
797 | ||
798 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
799 | fc->conn_error = 1; | |
800 | else { | |
9cd68455 MS |
801 | unsigned long ra_pages; |
802 | ||
487ea5af CH |
803 | process_init_limits(fc, arg); |
804 | ||
9cd68455 MS |
805 | if (arg->minor >= 6) { |
806 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; | |
807 | if (arg->flags & FUSE_ASYNC_READ) | |
808 | fc->async_read = 1; | |
71421259 MS |
809 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
810 | fc->no_lock = 1; | |
37fb3a30 MS |
811 | if (arg->minor >= 17) { |
812 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
813 | fc->no_flock = 1; | |
24114504 MS |
814 | } else { |
815 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
816 | fc->no_flock = 1; | |
37fb3a30 | 817 | } |
6ff958ed MS |
818 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
819 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
820 | if (arg->minor >= 9) { |
821 | /* LOOKUP has dependency on proto version */ | |
822 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
823 | fc->export_support = 1; | |
824 | } | |
78bb6cb9 MS |
825 | if (arg->flags & FUSE_BIG_WRITES) |
826 | fc->big_writes = 1; | |
e0a43ddc MS |
827 | if (arg->flags & FUSE_DONT_MASK) |
828 | fc->dont_mask = 1; | |
71421259 | 829 | } else { |
9cd68455 | 830 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
71421259 | 831 | fc->no_lock = 1; |
37fb3a30 | 832 | fc->no_flock = 1; |
71421259 | 833 | } |
9cd68455 MS |
834 | |
835 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
836 | fc->minor = arg->minor; |
837 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 838 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 839 | fc->conn_init = 1; |
9b9a0469 | 840 | } |
08a53cdc MS |
841 | fc->blocked = 0; |
842 | wake_up_all(&fc->blocked_waitq); | |
9b9a0469 MS |
843 | } |
844 | ||
ce1d5a49 | 845 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 846 | { |
9b9a0469 | 847 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 848 | |
9b9a0469 MS |
849 | arg->major = FUSE_KERNEL_VERSION; |
850 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
9cd68455 | 851 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
78bb6cb9 | 852 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 MS |
853 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
854 | FUSE_FLOCK_LOCKS; | |
9b9a0469 MS |
855 | req->in.h.opcode = FUSE_INIT; |
856 | req->in.numargs = 1; | |
857 | req->in.args[0].size = sizeof(*arg); | |
858 | req->in.args[0].value = arg; | |
859 | req->out.numargs = 1; | |
3ad2f3fb | 860 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
861 | with interface version < 7.5. Rest of init_out is zeroed |
862 | by do_get_request(), so a short reply is not a problem */ | |
863 | req->out.argvar = 1; | |
864 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
865 | req->out.args[0].value = &req->misc.init_out; | |
866 | req->end = process_init_reply; | |
b93f858a | 867 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
868 | } |
869 | ||
43901aab TH |
870 | static void fuse_free_conn(struct fuse_conn *fc) |
871 | { | |
872 | kfree(fc); | |
873 | } | |
874 | ||
a325f9b9 TH |
875 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
876 | { | |
877 | int err; | |
878 | ||
d993831f | 879 | fc->bdi.name = "fuse"; |
a325f9b9 | 880 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
a325f9b9 TH |
881 | /* fuse does it's own writeback accounting */ |
882 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; | |
883 | ||
884 | err = bdi_init(&fc->bdi); | |
885 | if (err) | |
886 | return err; | |
887 | ||
888 | fc->bdi_initialized = 1; | |
889 | ||
890 | if (sb->s_bdev) { | |
891 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
892 | MAJOR(fc->dev), MINOR(fc->dev)); | |
893 | } else { | |
894 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
895 | } | |
896 | ||
897 | if (err) | |
898 | return err; | |
899 | ||
900 | /* | |
901 | * For a single fuse filesystem use max 1% of dirty + | |
902 | * writeback threshold. | |
903 | * | |
904 | * This gives about 1M of write buffer for memory maps on a | |
905 | * machine with 1G and 10% dirty_ratio, which should be more | |
906 | * than enough. | |
907 | * | |
908 | * Privileged users can raise it by writing to | |
909 | * | |
910 | * /sys/class/bdi/<bdi>/max_ratio | |
911 | */ | |
912 | bdi_set_max_ratio(&fc->bdi, 1); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
d8a5ba45 MS |
917 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
918 | { | |
919 | struct fuse_conn *fc; | |
920 | struct inode *root; | |
921 | struct fuse_mount_data d; | |
922 | struct file *file; | |
f543f253 | 923 | struct dentry *root_dentry; |
ce1d5a49 | 924 | struct fuse_req *init_req; |
d8a5ba45 | 925 | int err; |
d8091614 | 926 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 927 | |
c2b8f006 | 928 | err = -EINVAL; |
71421259 | 929 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 930 | goto err; |
71421259 | 931 | |
9e1f1de0 AV |
932 | sb->s_flags &= ~MS_NOSEC; |
933 | ||
d8091614 | 934 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
c2b8f006 | 935 | goto err; |
d8a5ba45 | 936 | |
d8091614 | 937 | if (is_bdev) { |
875d95ec | 938 | #ifdef CONFIG_BLOCK |
c2b8f006 | 939 | err = -EINVAL; |
d8091614 | 940 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 941 | goto err; |
875d95ec | 942 | #endif |
d8091614 MS |
943 | } else { |
944 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
945 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
946 | } | |
d8a5ba45 MS |
947 | sb->s_magic = FUSE_SUPER_MAGIC; |
948 | sb->s_op = &fuse_super_operations; | |
949 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
dbd561d2 | 950 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
951 | |
952 | file = fget(d.fd); | |
c2b8f006 | 953 | err = -EINVAL; |
d8a5ba45 | 954 | if (!file) |
c2b8f006 | 955 | goto err; |
d8a5ba45 | 956 | |
c2b8f006 MS |
957 | if (file->f_op != &fuse_dev_operations) |
958 | goto err_fput; | |
0720b315 | 959 | |
0d179aa5 | 960 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
961 | err = -ENOMEM; |
962 | if (!fc) | |
963 | goto err_fput; | |
d8a5ba45 | 964 | |
a325f9b9 TH |
965 | fuse_conn_init(fc); |
966 | ||
967 | fc->dev = sb->s_dev; | |
3b463ae0 | 968 | fc->sb = sb; |
a325f9b9 TH |
969 | err = fuse_bdi_init(fc, sb); |
970 | if (err) | |
971 | goto err_put_conn; | |
0d179aa5 | 972 | |
32a88aa1 JA |
973 | sb->s_bdi = &fc->bdi; |
974 | ||
e0a43ddc MS |
975 | /* Handle umasking inside the fuse code */ |
976 | if (sb->s_flags & MS_POSIXACL) | |
977 | fc->dont_mask = 1; | |
978 | sb->s_flags |= MS_POSIXACL; | |
979 | ||
43901aab | 980 | fc->release = fuse_free_conn; |
1e9a4ed9 | 981 | fc->flags = d.flags; |
d8a5ba45 | 982 | fc->user_id = d.user_id; |
87729a55 | 983 | fc->group_id = d.group_id; |
f948d564 | 984 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 985 | |
f543f253 MS |
986 | /* Used by get_root_inode() */ |
987 | sb->s_fs_info = fc; | |
988 | ||
d8a5ba45 | 989 | err = -ENOMEM; |
b93f858a | 990 | root = fuse_get_root_inode(sb, d.rootmode); |
f543f253 | 991 | if (!root) |
c2b8f006 | 992 | goto err_put_conn; |
d8a5ba45 | 993 | |
f543f253 MS |
994 | root_dentry = d_alloc_root(root); |
995 | if (!root_dentry) { | |
d8a5ba45 | 996 | iput(root); |
c2b8f006 | 997 | goto err_put_conn; |
d8a5ba45 | 998 | } |
c35eebe9 AV |
999 | /* only now - we want root dentry with NULL ->d_op */ |
1000 | sb->s_d_op = &fuse_dentry_operations; | |
f543f253 | 1001 | |
ce1d5a49 MS |
1002 | init_req = fuse_request_alloc(); |
1003 | if (!init_req) | |
1004 | goto err_put_root; | |
1005 | ||
0ec7ca41 MS |
1006 | if (is_bdev) { |
1007 | fc->destroy_req = fuse_request_alloc(); | |
1008 | if (!fc->destroy_req) | |
17e18ab6 | 1009 | goto err_free_init_req; |
0ec7ca41 MS |
1010 | } |
1011 | ||
bafa9654 | 1012 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1013 | err = -EINVAL; |
1014 | if (file->private_data) | |
bafa9654 | 1015 | goto err_unlock; |
8aa09a50 | 1016 | |
bafa9654 MS |
1017 | err = fuse_ctl_add_conn(fc); |
1018 | if (err) | |
1019 | goto err_unlock; | |
1020 | ||
1021 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1022 | sb->s_root = root_dentry; |
f543f253 | 1023 | fc->connected = 1; |
bafa9654 MS |
1024 | file->private_data = fuse_conn_get(fc); |
1025 | mutex_unlock(&fuse_mutex); | |
0720b315 MS |
1026 | /* |
1027 | * atomic_dec_and_test() in fput() provides the necessary | |
1028 | * memory barrier for file->private_data to be visible on all | |
1029 | * CPUs after this | |
1030 | */ | |
1031 | fput(file); | |
f543f253 | 1032 | |
ce1d5a49 | 1033 | fuse_send_init(fc, init_req); |
f543f253 | 1034 | |
d8a5ba45 MS |
1035 | return 0; |
1036 | ||
bafa9654 MS |
1037 | err_unlock: |
1038 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1039 | err_free_init_req: |
ce1d5a49 | 1040 | fuse_request_free(init_req); |
f543f253 MS |
1041 | err_put_root: |
1042 | dput(root_dentry); | |
c2b8f006 | 1043 | err_put_conn: |
a325f9b9 | 1044 | fuse_bdi_destroy(fc); |
bafa9654 | 1045 | fuse_conn_put(fc); |
c2b8f006 MS |
1046 | err_fput: |
1047 | fput(file); | |
1048 | err: | |
d8a5ba45 MS |
1049 | return err; |
1050 | } | |
1051 | ||
3c26ff6e | 1052 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1053 | int flags, const char *dev_name, |
3c26ff6e | 1054 | void *raw_data) |
d8a5ba45 | 1055 | { |
3c26ff6e | 1056 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1057 | } |
1058 | ||
3b463ae0 JM |
1059 | static void fuse_kill_sb_anon(struct super_block *sb) |
1060 | { | |
1061 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1062 | ||
1063 | if (fc) { | |
1064 | down_write(&fc->killsb); | |
1065 | fc->sb = NULL; | |
1066 | up_write(&fc->killsb); | |
1067 | } | |
1068 | ||
1069 | kill_anon_super(sb); | |
1070 | } | |
1071 | ||
875d95ec MS |
1072 | static struct file_system_type fuse_fs_type = { |
1073 | .owner = THIS_MODULE, | |
1074 | .name = "fuse", | |
79c0b2df | 1075 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1076 | .mount = fuse_mount, |
3b463ae0 | 1077 | .kill_sb = fuse_kill_sb_anon, |
875d95ec MS |
1078 | }; |
1079 | ||
1080 | #ifdef CONFIG_BLOCK | |
152a0836 | 1081 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1082 | int flags, const char *dev_name, |
152a0836 | 1083 | void *raw_data) |
d6392f87 | 1084 | { |
152a0836 | 1085 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1086 | } |
1087 | ||
3b463ae0 JM |
1088 | static void fuse_kill_sb_blk(struct super_block *sb) |
1089 | { | |
1090 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1091 | ||
1092 | if (fc) { | |
1093 | down_write(&fc->killsb); | |
1094 | fc->sb = NULL; | |
1095 | up_write(&fc->killsb); | |
1096 | } | |
1097 | ||
1098 | kill_block_super(sb); | |
1099 | } | |
1100 | ||
d6392f87 MS |
1101 | static struct file_system_type fuseblk_fs_type = { |
1102 | .owner = THIS_MODULE, | |
1103 | .name = "fuseblk", | |
152a0836 | 1104 | .mount = fuse_mount_blk, |
3b463ae0 | 1105 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1106 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 MS |
1107 | }; |
1108 | ||
875d95ec MS |
1109 | static inline int register_fuseblk(void) |
1110 | { | |
1111 | return register_filesystem(&fuseblk_fs_type); | |
1112 | } | |
1113 | ||
1114 | static inline void unregister_fuseblk(void) | |
1115 | { | |
1116 | unregister_filesystem(&fuseblk_fs_type); | |
1117 | } | |
1118 | #else | |
1119 | static inline int register_fuseblk(void) | |
1120 | { | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static inline void unregister_fuseblk(void) | |
1125 | { | |
1126 | } | |
1127 | #endif | |
1128 | ||
51cc5068 | 1129 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1130 | { |
1729a16c | 1131 | struct inode *inode = foo; |
d8a5ba45 | 1132 | |
a35afb83 | 1133 | inode_init_once(inode); |
d8a5ba45 MS |
1134 | } |
1135 | ||
1136 | static int __init fuse_fs_init(void) | |
1137 | { | |
1138 | int err; | |
1139 | ||
d6392f87 MS |
1140 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
1141 | sizeof(struct fuse_inode), | |
1142 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1143 | fuse_inode_init_once); |
d6392f87 MS |
1144 | err = -ENOMEM; |
1145 | if (!fuse_inode_cachep) | |
988f0325 AV |
1146 | goto out; |
1147 | ||
1148 | err = register_fuseblk(); | |
1149 | if (err) | |
1150 | goto out2; | |
1151 | ||
1152 | err = register_filesystem(&fuse_fs_type); | |
1153 | if (err) | |
1154 | goto out3; | |
d6392f87 MS |
1155 | |
1156 | return 0; | |
d8a5ba45 | 1157 | |
988f0325 | 1158 | out3: |
875d95ec | 1159 | unregister_fuseblk(); |
988f0325 AV |
1160 | out2: |
1161 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1162 | out: |
d8a5ba45 MS |
1163 | return err; |
1164 | } | |
1165 | ||
1166 | static void fuse_fs_cleanup(void) | |
1167 | { | |
1168 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1169 | unregister_fuseblk(); |
d8a5ba45 MS |
1170 | kmem_cache_destroy(fuse_inode_cachep); |
1171 | } | |
1172 | ||
5c89e17e GKH |
1173 | static struct kobject *fuse_kobj; |
1174 | static struct kobject *connections_kobj; | |
1175 | ||
f543f253 MS |
1176 | static int fuse_sysfs_init(void) |
1177 | { | |
1178 | int err; | |
1179 | ||
00d26666 | 1180 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1181 | if (!fuse_kobj) { |
1182 | err = -ENOMEM; | |
f543f253 | 1183 | goto out_err; |
5c89e17e | 1184 | } |
f543f253 | 1185 | |
5c89e17e GKH |
1186 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
1187 | if (!connections_kobj) { | |
1188 | err = -ENOMEM; | |
f543f253 | 1189 | goto out_fuse_unregister; |
5c89e17e | 1190 | } |
f543f253 MS |
1191 | |
1192 | return 0; | |
1193 | ||
1194 | out_fuse_unregister: | |
197b12d6 | 1195 | kobject_put(fuse_kobj); |
f543f253 MS |
1196 | out_err: |
1197 | return err; | |
1198 | } | |
1199 | ||
1200 | static void fuse_sysfs_cleanup(void) | |
1201 | { | |
197b12d6 GKH |
1202 | kobject_put(connections_kobj); |
1203 | kobject_put(fuse_kobj); | |
f543f253 MS |
1204 | } |
1205 | ||
d8a5ba45 MS |
1206 | static int __init fuse_init(void) |
1207 | { | |
1208 | int res; | |
1209 | ||
1729a16c | 1210 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1211 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1212 | ||
bafa9654 | 1213 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1214 | res = fuse_fs_init(); |
1215 | if (res) | |
1216 | goto err; | |
1217 | ||
334f485d MS |
1218 | res = fuse_dev_init(); |
1219 | if (res) | |
1220 | goto err_fs_cleanup; | |
1221 | ||
f543f253 MS |
1222 | res = fuse_sysfs_init(); |
1223 | if (res) | |
1224 | goto err_dev_cleanup; | |
1225 | ||
bafa9654 MS |
1226 | res = fuse_ctl_init(); |
1227 | if (res) | |
1228 | goto err_sysfs_cleanup; | |
1229 | ||
487ea5af CH |
1230 | sanitize_global_limit(&max_user_bgreq); |
1231 | sanitize_global_limit(&max_user_congthresh); | |
1232 | ||
d8a5ba45 MS |
1233 | return 0; |
1234 | ||
bafa9654 MS |
1235 | err_sysfs_cleanup: |
1236 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1237 | err_dev_cleanup: |
1238 | fuse_dev_cleanup(); | |
334f485d MS |
1239 | err_fs_cleanup: |
1240 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1241 | err: |
1242 | return res; | |
1243 | } | |
1244 | ||
1245 | static void __exit fuse_exit(void) | |
1246 | { | |
1247 | printk(KERN_DEBUG "fuse exit\n"); | |
1248 | ||
bafa9654 | 1249 | fuse_ctl_cleanup(); |
f543f253 | 1250 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1251 | fuse_fs_cleanup(); |
334f485d | 1252 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1253 | } |
1254 | ||
1255 | module_init(fuse_init); | |
1256 | module_exit(fuse_exit); |