Commit | Line | Data |
---|---|---|
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> |
60bcc88a | 23 | #include <linux/posix_acl.h> |
d8a5ba45 MS |
24 | |
25 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
26 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | ||
e18b890b | 29 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
30 | struct list_head fuse_conn_list; |
31 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 32 | |
487ea5af CH |
33 | static int set_global_limit(const char *val, struct kernel_param *kp); |
34 | ||
79a9d994 | 35 | unsigned max_user_bgreq; |
487ea5af CH |
36 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
37 | &max_user_bgreq, 0644); | |
38 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
39 | MODULE_PARM_DESC(max_user_bgreq, | |
40 | "Global limit for the maximum number of backgrounded requests an " | |
41 | "unprivileged user can set"); | |
42 | ||
79a9d994 | 43 | unsigned max_user_congthresh; |
487ea5af CH |
44 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
45 | &max_user_congthresh, 0644); | |
46 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
47 | MODULE_PARM_DESC(max_user_congthresh, | |
48 | "Global limit for the maximum congestion threshold an " | |
49 | "unprivileged user can set"); | |
50 | ||
d8a5ba45 MS |
51 | #define FUSE_SUPER_MAGIC 0x65735546 |
52 | ||
d1875dba MS |
53 | #define FUSE_DEFAULT_BLKSIZE 512 |
54 | ||
7a6d3c8b CH |
55 | /** Maximum number of outstanding background requests */ |
56 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
57 | ||
58 | /** Congestion starts at 75% of maximum */ | |
59 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
60 | ||
d8a5ba45 MS |
61 | struct fuse_mount_data { |
62 | int fd; | |
63 | unsigned rootmode; | |
499dcf20 EB |
64 | kuid_t user_id; |
65 | kgid_t group_id; | |
1729a16c MS |
66 | unsigned fd_present:1; |
67 | unsigned rootmode_present:1; | |
68 | unsigned user_id_present:1; | |
69 | unsigned group_id_present:1; | |
29433a29 MS |
70 | unsigned default_permissions:1; |
71 | unsigned allow_other:1; | |
db50b96c | 72 | unsigned max_read; |
d8091614 | 73 | unsigned blksize; |
d8a5ba45 MS |
74 | }; |
75 | ||
a2daff68 | 76 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
77 | { |
78 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
79 | } | |
80 | ||
d8a5ba45 MS |
81 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
82 | { | |
83 | struct inode *inode; | |
84 | struct fuse_inode *fi; | |
85 | ||
e94b1766 | 86 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
87 | if (!inode) |
88 | return NULL; | |
89 | ||
90 | fi = get_fuse_inode(inode); | |
0a0898cf | 91 | fi->i_time = 0; |
d8a5ba45 | 92 | fi->nodeid = 0; |
9e6268db | 93 | fi->nlookup = 0; |
fbee36b9 | 94 | fi->attr_version = 0; |
3be5a52b | 95 | fi->writectr = 0; |
45c72cd7 | 96 | fi->orig_ino = 0; |
4582a4ab | 97 | fi->state = 0; |
93a8c3cd | 98 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
99 | INIT_LIST_HEAD(&fi->queued_writes); |
100 | INIT_LIST_HEAD(&fi->writepages); | |
101 | init_waitqueue_head(&fi->page_waitq); | |
5c672ab3 | 102 | mutex_init(&fi->mutex); |
07e77dca MS |
103 | fi->forget = fuse_alloc_forget(); |
104 | if (!fi->forget) { | |
e5e5558e MS |
105 | kmem_cache_free(fuse_inode_cachep, inode); |
106 | return NULL; | |
107 | } | |
d8a5ba45 MS |
108 | |
109 | return inode; | |
110 | } | |
111 | ||
fa0d7e3d NP |
112 | static void fuse_i_callback(struct rcu_head *head) |
113 | { | |
114 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
115 | kmem_cache_free(fuse_inode_cachep, inode); |
116 | } | |
117 | ||
d8a5ba45 MS |
118 | static void fuse_destroy_inode(struct inode *inode) |
119 | { | |
e5e5558e | 120 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 121 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 122 | BUG_ON(!list_empty(&fi->queued_writes)); |
5c672ab3 | 123 | mutex_destroy(&fi->mutex); |
07e77dca | 124 | kfree(fi->forget); |
fa0d7e3d | 125 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
126 | } |
127 | ||
b57922d9 | 128 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 129 | { |
91b0abe3 | 130 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 131 | clear_inode(inode); |
1e9a4ed9 MS |
132 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
133 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 134 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
135 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
136 | fi->forget = NULL; | |
e5e5558e | 137 | } |
d8a5ba45 MS |
138 | } |
139 | ||
71421259 MS |
140 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
141 | { | |
02b9984d | 142 | sync_filesystem(sb); |
71421259 MS |
143 | if (*flags & MS_MANDLOCK) |
144 | return -EINVAL; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
45c72cd7 PS |
149 | /* |
150 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
151 | * so that it will fit. | |
152 | */ | |
153 | static ino_t fuse_squash_ino(u64 ino64) | |
154 | { | |
155 | ino_t ino = (ino_t) ino64; | |
156 | if (sizeof(ino_t) < sizeof(u64)) | |
157 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
158 | return ino; | |
159 | } | |
160 | ||
3be5a52b MS |
161 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
162 | u64 attr_valid) | |
d8a5ba45 | 163 | { |
9ffbb916 | 164 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 165 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 166 | |
1fb69e78 MS |
167 | fi->attr_version = ++fc->attr_version; |
168 | fi->i_time = attr_valid; | |
169 | ||
45c72cd7 | 170 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 171 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 172 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
173 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
174 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
175 | inode->i_blocks = attr->blocks; |
176 | inode->i_atime.tv_sec = attr->atime; | |
177 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
178 | /* mtime from server may be stale due to local buffered write */ |
179 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
180 | inode->i_mtime.tv_sec = attr->mtime; | |
181 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
182 | inode->i_ctime.tv_sec = attr->ctime; |
183 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 184 | } |
e00d2c2d | 185 | |
0e9663ee MS |
186 | if (attr->blksize != 0) |
187 | inode->i_blkbits = ilog2(attr->blksize); | |
188 | else | |
189 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
190 | ||
ebc14c4d MS |
191 | /* |
192 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
193 | * to check permissions. This prevents failures due to the | |
194 | * check in may_delete(). | |
195 | */ | |
196 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 197 | if (!fc->default_permissions) |
ebc14c4d | 198 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
199 | |
200 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
201 | } |
202 | ||
203 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
204 | u64 attr_valid, u64 attr_version) | |
205 | { | |
206 | struct fuse_conn *fc = get_fuse_conn(inode); | |
207 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 208 | bool is_wb = fc->writeback_cache; |
3be5a52b | 209 | loff_t oldsize; |
eed2179e | 210 | struct timespec old_mtime; |
3be5a52b MS |
211 | |
212 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
213 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
214 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
215 | spin_unlock(&fc->lock); |
216 | return; | |
217 | } | |
218 | ||
eed2179e | 219 | old_mtime = inode->i_mtime; |
3be5a52b | 220 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 221 | |
e00d2c2d | 222 | oldsize = inode->i_size; |
8373200b PE |
223 | /* |
224 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
225 | * extend local i_size without keeping userspace server in sync. So, | |
226 | * attr->size coming from server can be stale. We cannot trust it. | |
227 | */ | |
228 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
229 | i_size_write(inode, attr->size); | |
e00d2c2d MS |
230 | spin_unlock(&fc->lock); |
231 | ||
8373200b | 232 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
233 | bool inval = false; |
234 | ||
235 | if (oldsize != attr->size) { | |
7caef267 | 236 | truncate_pagecache(inode, attr->size); |
eed2179e BF |
237 | inval = true; |
238 | } else if (fc->auto_inval_data) { | |
239 | struct timespec new_mtime = { | |
240 | .tv_sec = attr->mtime, | |
241 | .tv_nsec = attr->mtimensec, | |
242 | }; | |
243 | ||
244 | /* | |
245 | * Auto inval mode also checks and invalidates if mtime | |
246 | * has changed. | |
247 | */ | |
248 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
249 | inval = true; | |
250 | } | |
251 | ||
252 | if (inval) | |
253 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 254 | } |
d8a5ba45 MS |
255 | } |
256 | ||
257 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
258 | { | |
259 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 260 | inode->i_size = attr->size; |
b0aa7606 MP |
261 | inode->i_mtime.tv_sec = attr->mtime; |
262 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
263 | inode->i_ctime.tv_sec = attr->ctime; |
264 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
265 | if (S_ISREG(inode->i_mode)) { |
266 | fuse_init_common(inode); | |
b6aeaded | 267 | fuse_init_file_inode(inode); |
e5e5558e MS |
268 | } else if (S_ISDIR(inode->i_mode)) |
269 | fuse_init_dir(inode); | |
270 | else if (S_ISLNK(inode->i_mode)) | |
271 | fuse_init_symlink(inode); | |
272 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
273 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
274 | fuse_init_common(inode); | |
275 | init_special_inode(inode, inode->i_mode, | |
276 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
277 | } else |
278 | BUG(); | |
d8a5ba45 MS |
279 | } |
280 | ||
3b463ae0 | 281 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 282 | { |
b48badf0 | 283 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
284 | if (get_node_id(inode) == nodeid) |
285 | return 1; | |
286 | else | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
291 | { | |
b48badf0 | 292 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
293 | get_fuse_inode(inode)->nodeid = nodeid; |
294 | return 0; | |
295 | } | |
296 | ||
b48badf0 | 297 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
298 | int generation, struct fuse_attr *attr, |
299 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
300 | { |
301 | struct inode *inode; | |
9e6268db | 302 | struct fuse_inode *fi; |
d8a5ba45 | 303 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
304 | |
305 | retry: | |
306 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
307 | if (!inode) | |
308 | return NULL; | |
309 | ||
310 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 311 | inode->i_flags |= S_NOATIME; |
d31433c8 | 312 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 313 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 314 | inode->i_generation = generation; |
d8a5ba45 MS |
315 | fuse_init_inode(inode, attr); |
316 | unlock_new_inode(inode); | |
317 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
318 | /* Inode has changed type, any I/O on the old should fail */ |
319 | make_bad_inode(inode); | |
320 | iput(inode); | |
d8a5ba45 MS |
321 | goto retry; |
322 | } | |
323 | ||
9e6268db | 324 | fi = get_fuse_inode(inode); |
8da5ff23 | 325 | spin_lock(&fc->lock); |
1729a16c | 326 | fi->nlookup++; |
8da5ff23 | 327 | spin_unlock(&fc->lock); |
1fb69e78 MS |
328 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
329 | ||
d8a5ba45 MS |
330 | return inode; |
331 | } | |
332 | ||
3b463ae0 JM |
333 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
334 | loff_t offset, loff_t len) | |
335 | { | |
336 | struct inode *inode; | |
337 | pgoff_t pg_start; | |
338 | pgoff_t pg_end; | |
339 | ||
340 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
341 | if (!inode) | |
342 | return -ENOENT; | |
343 | ||
344 | fuse_invalidate_attr(inode); | |
60bcc88a | 345 | forget_all_cached_acls(inode); |
3b463ae0 | 346 | if (offset >= 0) { |
09cbfeaf | 347 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
348 | if (len <= 0) |
349 | pg_end = -1; | |
350 | else | |
09cbfeaf | 351 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
352 | invalidate_inode_pages2_range(inode->i_mapping, |
353 | pg_start, pg_end); | |
354 | } | |
355 | iput(inode); | |
356 | return 0; | |
357 | } | |
358 | ||
5c672ab3 MS |
359 | void fuse_lock_inode(struct inode *inode) |
360 | { | |
361 | if (!get_fuse_conn(inode)->parallel_dirops) | |
362 | mutex_lock(&get_fuse_inode(inode)->mutex); | |
363 | } | |
364 | ||
365 | void fuse_unlock_inode(struct inode *inode) | |
366 | { | |
367 | if (!get_fuse_conn(inode)->parallel_dirops) | |
368 | mutex_unlock(&get_fuse_inode(inode)->mutex); | |
369 | } | |
370 | ||
42faad99 | 371 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 372 | { |
42faad99 | 373 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
374 | } |
375 | ||
0ec7ca41 MS |
376 | static void fuse_send_destroy(struct fuse_conn *fc) |
377 | { | |
378 | struct fuse_req *req = fc->destroy_req; | |
379 | if (req && fc->conn_init) { | |
380 | fc->destroy_req = NULL; | |
381 | req->in.h.opcode = FUSE_DESTROY; | |
825d6d33 MS |
382 | __set_bit(FR_FORCE, &req->flags); |
383 | __clear_bit(FR_BACKGROUND, &req->flags); | |
b93f858a | 384 | fuse_request_send(fc, req); |
0ec7ca41 MS |
385 | fuse_put_request(fc, req); |
386 | } | |
387 | } | |
388 | ||
a325f9b9 | 389 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 390 | { |
a325f9b9 TH |
391 | if (fc->bdi_initialized) |
392 | bdi_destroy(&fc->bdi); | |
393 | } | |
d8a5ba45 | 394 | |
a325f9b9 TH |
395 | static void fuse_put_super(struct super_block *sb) |
396 | { | |
397 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
398 | ||
399 | fuse_send_destroy(fc); | |
bbd99797 | 400 | |
580640ba | 401 | fuse_abort_conn(fc); |
bbd99797 MS |
402 | mutex_lock(&fuse_mutex); |
403 | list_del(&fc->entry); | |
404 | fuse_ctl_remove_conn(fc); | |
405 | mutex_unlock(&fuse_mutex); | |
406 | fuse_bdi_destroy(fc); | |
407 | ||
bafa9654 | 408 | fuse_conn_put(fc); |
d8a5ba45 MS |
409 | } |
410 | ||
e5e5558e MS |
411 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
412 | { | |
413 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
414 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 415 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
416 | stbuf->f_blocks = attr->blocks; |
417 | stbuf->f_bfree = attr->bfree; | |
418 | stbuf->f_bavail = attr->bavail; | |
419 | stbuf->f_files = attr->files; | |
420 | stbuf->f_ffree = attr->ffree; | |
421 | stbuf->f_namelen = attr->namelen; | |
422 | /* fsid is left zero */ | |
423 | } | |
424 | ||
726c3342 | 425 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 426 | { |
726c3342 | 427 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 428 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 429 | FUSE_ARGS(args); |
e5e5558e MS |
430 | struct fuse_statfs_out outarg; |
431 | int err; | |
432 | ||
c2132c1b | 433 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
434 | buf->f_type = FUSE_SUPER_MAGIC; |
435 | return 0; | |
436 | } | |
437 | ||
de5f1202 | 438 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
439 | args.in.numargs = 0; |
440 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 441 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 442 | args.out.numargs = 1; |
21f62174 | 443 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
444 | args.out.args[0].value = &outarg; |
445 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
446 | if (!err) |
447 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
448 | return err; |
449 | } | |
450 | ||
d8a5ba45 MS |
451 | enum { |
452 | OPT_FD, | |
453 | OPT_ROOTMODE, | |
454 | OPT_USER_ID, | |
87729a55 | 455 | OPT_GROUP_ID, |
d8a5ba45 MS |
456 | OPT_DEFAULT_PERMISSIONS, |
457 | OPT_ALLOW_OTHER, | |
db50b96c | 458 | OPT_MAX_READ, |
d8091614 | 459 | OPT_BLKSIZE, |
d8a5ba45 MS |
460 | OPT_ERR |
461 | }; | |
462 | ||
a447c093 | 463 | static const match_table_t tokens = { |
d8a5ba45 MS |
464 | {OPT_FD, "fd=%u"}, |
465 | {OPT_ROOTMODE, "rootmode=%o"}, | |
466 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 467 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
468 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
469 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 470 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 471 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
472 | {OPT_ERR, NULL} |
473 | }; | |
474 | ||
233a01fa MS |
475 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
476 | { | |
477 | int err = -ENOMEM; | |
478 | char *buf = match_strdup(s); | |
479 | if (buf) { | |
480 | err = kstrtouint(buf, 10, res); | |
481 | kfree(buf); | |
482 | } | |
483 | return err; | |
484 | } | |
485 | ||
d8091614 | 486 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
487 | { |
488 | char *p; | |
489 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 490 | d->max_read = ~0; |
d1875dba | 491 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
492 | |
493 | while ((p = strsep(&opt, ",")) != NULL) { | |
494 | int token; | |
495 | int value; | |
233a01fa | 496 | unsigned uv; |
d8a5ba45 MS |
497 | substring_t args[MAX_OPT_ARGS]; |
498 | if (!*p) | |
499 | continue; | |
500 | ||
501 | token = match_token(p, tokens, args); | |
502 | switch (token) { | |
503 | case OPT_FD: | |
504 | if (match_int(&args[0], &value)) | |
505 | return 0; | |
506 | d->fd = value; | |
5a533682 | 507 | d->fd_present = 1; |
d8a5ba45 MS |
508 | break; |
509 | ||
510 | case OPT_ROOTMODE: | |
511 | if (match_octal(&args[0], &value)) | |
512 | return 0; | |
a5bfffac TS |
513 | if (!fuse_valid_type(value)) |
514 | return 0; | |
d8a5ba45 | 515 | d->rootmode = value; |
5a533682 | 516 | d->rootmode_present = 1; |
d8a5ba45 MS |
517 | break; |
518 | ||
519 | case OPT_USER_ID: | |
233a01fa | 520 | if (fuse_match_uint(&args[0], &uv)) |
d8a5ba45 | 521 | return 0; |
233a01fa | 522 | d->user_id = make_kuid(current_user_ns(), uv); |
499dcf20 EB |
523 | if (!uid_valid(d->user_id)) |
524 | return 0; | |
5a533682 | 525 | d->user_id_present = 1; |
d8a5ba45 MS |
526 | break; |
527 | ||
87729a55 | 528 | case OPT_GROUP_ID: |
233a01fa | 529 | if (fuse_match_uint(&args[0], &uv)) |
87729a55 | 530 | return 0; |
233a01fa | 531 | d->group_id = make_kgid(current_user_ns(), uv); |
499dcf20 EB |
532 | if (!gid_valid(d->group_id)) |
533 | return 0; | |
5a533682 | 534 | d->group_id_present = 1; |
87729a55 MS |
535 | break; |
536 | ||
1e9a4ed9 | 537 | case OPT_DEFAULT_PERMISSIONS: |
29433a29 | 538 | d->default_permissions = 1; |
1e9a4ed9 MS |
539 | break; |
540 | ||
541 | case OPT_ALLOW_OTHER: | |
29433a29 | 542 | d->allow_other = 1; |
1e9a4ed9 MS |
543 | break; |
544 | ||
db50b96c MS |
545 | case OPT_MAX_READ: |
546 | if (match_int(&args[0], &value)) | |
547 | return 0; | |
548 | d->max_read = value; | |
549 | break; | |
550 | ||
d8091614 MS |
551 | case OPT_BLKSIZE: |
552 | if (!is_bdev || match_int(&args[0], &value)) | |
553 | return 0; | |
554 | d->blksize = value; | |
555 | break; | |
556 | ||
d8a5ba45 MS |
557 | default: |
558 | return 0; | |
559 | } | |
560 | } | |
5a533682 MS |
561 | |
562 | if (!d->fd_present || !d->rootmode_present || | |
563 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
564 | return 0; |
565 | ||
566 | return 1; | |
567 | } | |
568 | ||
34c80b1d | 569 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 570 | { |
34c80b1d AV |
571 | struct super_block *sb = root->d_sb; |
572 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 573 | |
499dcf20 EB |
574 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
575 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
29433a29 | 576 | if (fc->default_permissions) |
1e9a4ed9 | 577 | seq_puts(m, ",default_permissions"); |
29433a29 | 578 | if (fc->allow_other) |
1e9a4ed9 | 579 | seq_puts(m, ",allow_other"); |
db50b96c MS |
580 | if (fc->max_read != ~0) |
581 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
582 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
583 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
584 | return 0; |
585 | } | |
586 | ||
f88996a9 MS |
587 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
588 | { | |
589 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
590 | init_waitqueue_head(&fiq->waitq); | |
591 | INIT_LIST_HEAD(&fiq->pending); | |
592 | INIT_LIST_HEAD(&fiq->interrupts); | |
593 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 594 | fiq->connected = 1; |
f88996a9 MS |
595 | } |
596 | ||
3a2b5b9c MS |
597 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
598 | { | |
599 | memset(fpq, 0, sizeof(struct fuse_pqueue)); | |
45a91cb1 | 600 | spin_lock_init(&fpq->lock); |
3a2b5b9c MS |
601 | INIT_LIST_HEAD(&fpq->processing); |
602 | INIT_LIST_HEAD(&fpq->io); | |
e96edd94 | 603 | fpq->connected = 1; |
3a2b5b9c MS |
604 | } |
605 | ||
a325f9b9 | 606 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 607 | { |
0d179aa5 TH |
608 | memset(fc, 0, sizeof(*fc)); |
609 | spin_lock_init(&fc->lock); | |
3b463ae0 | 610 | init_rwsem(&fc->killsb); |
0d179aa5 | 611 | atomic_set(&fc->count, 1); |
c3696046 | 612 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
613 | init_waitqueue_head(&fc->blocked_waitq); |
614 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 615 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
616 | INIT_LIST_HEAD(&fc->bg_queue); |
617 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 618 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 619 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
620 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
621 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
622 | fc->khctr = 0; |
623 | fc->polled_files = RB_ROOT; | |
0aada884 | 624 | fc->blocked = 0; |
796523fb | 625 | fc->initialized = 0; |
e16714d8 | 626 | fc->connected = 1; |
0d179aa5 TH |
627 | fc->attr_version = 1; |
628 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 629 | } |
0d179aa5 | 630 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 631 | |
bafa9654 MS |
632 | void fuse_conn_put(struct fuse_conn *fc) |
633 | { | |
d2a85164 | 634 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
635 | if (fc->destroy_req) |
636 | fuse_request_free(fc->destroy_req); | |
43901aab | 637 | fc->release(fc); |
d2a85164 | 638 | } |
bafa9654 | 639 | } |
08cbf542 | 640 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
641 | |
642 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
643 | { | |
644 | atomic_inc(&fc->count); | |
645 | return fc; | |
646 | } | |
08cbf542 | 647 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 648 | |
b93f858a | 649 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
650 | { |
651 | struct fuse_attr attr; | |
652 | memset(&attr, 0, sizeof(attr)); | |
653 | ||
654 | attr.mode = mode; | |
655 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 656 | attr.nlink = 1; |
1fb69e78 | 657 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
658 | } |
659 | ||
1729a16c | 660 | struct fuse_inode_handle { |
dbd561d2 MS |
661 | u64 nodeid; |
662 | u32 generation; | |
663 | }; | |
664 | ||
665 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
666 | struct fuse_inode_handle *handle) | |
667 | { | |
33670fa2 | 668 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
669 | struct inode *inode; |
670 | struct dentry *entry; | |
671 | int err = -ESTALE; | |
672 | ||
673 | if (handle->nodeid == 0) | |
674 | goto out_err; | |
675 | ||
676 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
677 | if (!inode) { |
678 | struct fuse_entry_out outarg; | |
13983d06 | 679 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
680 | |
681 | if (!fc->export_support) | |
682 | goto out_err; | |
683 | ||
33670fa2 MS |
684 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
685 | &inode); | |
686 | if (err && err != -ENOENT) | |
687 | goto out_err; | |
688 | if (err || !inode) { | |
689 | err = -ESTALE; | |
690 | goto out_err; | |
691 | } | |
692 | err = -EIO; | |
693 | if (get_node_id(inode) != handle->nodeid) | |
694 | goto out_iput; | |
695 | } | |
dbd561d2 MS |
696 | err = -ESTALE; |
697 | if (inode->i_generation != handle->generation) | |
698 | goto out_iput; | |
699 | ||
44003728 | 700 | entry = d_obtain_alias(inode); |
c35eebe9 | 701 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 702 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
703 | |
704 | return entry; | |
705 | ||
706 | out_iput: | |
707 | iput(inode); | |
708 | out_err: | |
709 | return ERR_PTR(err); | |
710 | } | |
711 | ||
b0b0382b AV |
712 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
713 | struct inode *parent) | |
dbd561d2 | 714 | { |
b0b0382b | 715 | int len = parent ? 6 : 3; |
dbd561d2 MS |
716 | u64 nodeid; |
717 | u32 generation; | |
718 | ||
5fe0c237 AK |
719 | if (*max_len < len) { |
720 | *max_len = len; | |
94e07a75 | 721 | return FILEID_INVALID; |
5fe0c237 | 722 | } |
dbd561d2 MS |
723 | |
724 | nodeid = get_fuse_inode(inode)->nodeid; | |
725 | generation = inode->i_generation; | |
726 | ||
727 | fh[0] = (u32)(nodeid >> 32); | |
728 | fh[1] = (u32)(nodeid & 0xffffffff); | |
729 | fh[2] = generation; | |
730 | ||
b0b0382b | 731 | if (parent) { |
dbd561d2 MS |
732 | nodeid = get_fuse_inode(parent)->nodeid; |
733 | generation = parent->i_generation; | |
dbd561d2 MS |
734 | |
735 | fh[3] = (u32)(nodeid >> 32); | |
736 | fh[4] = (u32)(nodeid & 0xffffffff); | |
737 | fh[5] = generation; | |
738 | } | |
739 | ||
740 | *max_len = len; | |
b0b0382b | 741 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
742 | } |
743 | ||
744 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
745 | struct fid *fid, int fh_len, int fh_type) | |
746 | { | |
747 | struct fuse_inode_handle handle; | |
748 | ||
749 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
750 | return NULL; | |
751 | ||
752 | handle.nodeid = (u64) fid->raw[0] << 32; | |
753 | handle.nodeid |= (u64) fid->raw[1]; | |
754 | handle.generation = fid->raw[2]; | |
755 | return fuse_get_dentry(sb, &handle); | |
756 | } | |
757 | ||
758 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
759 | struct fid *fid, int fh_len, int fh_type) | |
760 | { | |
761 | struct fuse_inode_handle parent; | |
762 | ||
763 | if (fh_type != 0x82 || fh_len < 6) | |
764 | return NULL; | |
765 | ||
766 | parent.nodeid = (u64) fid->raw[3] << 32; | |
767 | parent.nodeid |= (u64) fid->raw[4]; | |
768 | parent.generation = fid->raw[5]; | |
769 | return fuse_get_dentry(sb, &parent); | |
770 | } | |
771 | ||
33670fa2 MS |
772 | static struct dentry *fuse_get_parent(struct dentry *child) |
773 | { | |
2b0143b5 | 774 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
775 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
776 | struct inode *inode; | |
777 | struct dentry *parent; | |
778 | struct fuse_entry_out outarg; | |
13983d06 | 779 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
780 | int err; |
781 | ||
782 | if (!fc->export_support) | |
783 | return ERR_PTR(-ESTALE); | |
784 | ||
33670fa2 MS |
785 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
786 | &name, &outarg, &inode); | |
44003728 CH |
787 | if (err) { |
788 | if (err == -ENOENT) | |
789 | return ERR_PTR(-ESTALE); | |
33670fa2 | 790 | return ERR_PTR(err); |
33670fa2 | 791 | } |
44003728 CH |
792 | |
793 | parent = d_obtain_alias(inode); | |
c35eebe9 | 794 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 795 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
796 | |
797 | return parent; | |
798 | } | |
dbd561d2 MS |
799 | |
800 | static const struct export_operations fuse_export_operations = { | |
801 | .fh_to_dentry = fuse_fh_to_dentry, | |
802 | .fh_to_parent = fuse_fh_to_parent, | |
803 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 804 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
805 | }; |
806 | ||
ee9b6d61 | 807 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
808 | .alloc_inode = fuse_alloc_inode, |
809 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 810 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 811 | .write_inode = fuse_write_inode, |
ead5f0b5 | 812 | .drop_inode = generic_delete_inode, |
71421259 | 813 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 814 | .put_super = fuse_put_super, |
69a53bf2 | 815 | .umount_begin = fuse_umount_begin, |
e5e5558e | 816 | .statfs = fuse_statfs, |
d8a5ba45 MS |
817 | .show_options = fuse_show_options, |
818 | }; | |
819 | ||
487ea5af CH |
820 | static void sanitize_global_limit(unsigned *limit) |
821 | { | |
822 | if (*limit == 0) | |
0ed5fd13 | 823 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
824 | sizeof(struct fuse_req); |
825 | ||
826 | if (*limit >= 1 << 16) | |
827 | *limit = (1 << 16) - 1; | |
828 | } | |
829 | ||
830 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
831 | { | |
832 | int rv; | |
833 | ||
834 | rv = param_set_uint(val, kp); | |
835 | if (rv) | |
836 | return rv; | |
837 | ||
838 | sanitize_global_limit((unsigned *)kp->arg); | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
844 | { | |
845 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
846 | ||
847 | if (arg->minor < 13) | |
848 | return; | |
849 | ||
850 | sanitize_global_limit(&max_user_bgreq); | |
851 | sanitize_global_limit(&max_user_congthresh); | |
852 | ||
853 | if (arg->max_background) { | |
854 | fc->max_background = arg->max_background; | |
855 | ||
856 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
857 | fc->max_background = max_user_bgreq; | |
858 | } | |
859 | if (arg->congestion_threshold) { | |
860 | fc->congestion_threshold = arg->congestion_threshold; | |
861 | ||
862 | if (!cap_sys_admin && | |
863 | fc->congestion_threshold > max_user_congthresh) | |
864 | fc->congestion_threshold = max_user_congthresh; | |
865 | } | |
866 | } | |
867 | ||
9b9a0469 MS |
868 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
869 | { | |
9b9a0469 MS |
870 | struct fuse_init_out *arg = &req->misc.init_out; |
871 | ||
872 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
873 | fc->conn_error = 1; | |
874 | else { | |
9cd68455 MS |
875 | unsigned long ra_pages; |
876 | ||
487ea5af CH |
877 | process_init_limits(fc, arg); |
878 | ||
9cd68455 | 879 | if (arg->minor >= 6) { |
09cbfeaf | 880 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
881 | if (arg->flags & FUSE_ASYNC_READ) |
882 | fc->async_read = 1; | |
71421259 MS |
883 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
884 | fc->no_lock = 1; | |
37fb3a30 MS |
885 | if (arg->minor >= 17) { |
886 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
887 | fc->no_flock = 1; | |
24114504 MS |
888 | } else { |
889 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
890 | fc->no_flock = 1; | |
37fb3a30 | 891 | } |
6ff958ed MS |
892 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
893 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
894 | if (arg->minor >= 9) { |
895 | /* LOOKUP has dependency on proto version */ | |
896 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
897 | fc->export_support = 1; | |
898 | } | |
78bb6cb9 MS |
899 | if (arg->flags & FUSE_BIG_WRITES) |
900 | fc->big_writes = 1; | |
e0a43ddc MS |
901 | if (arg->flags & FUSE_DONT_MASK) |
902 | fc->dont_mask = 1; | |
72d0d248 BF |
903 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
904 | fc->auto_inval_data = 1; | |
28420dad | 905 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 906 | fc->do_readdirplus = 1; |
28420dad MS |
907 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
908 | fc->readdirplus_auto = 1; | |
909 | } | |
60b9df7a MS |
910 | if (arg->flags & FUSE_ASYNC_DIO) |
911 | fc->async_dio = 1; | |
4d99ff8f PE |
912 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
913 | fc->writeback_cache = 1; | |
5c672ab3 MS |
914 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
915 | fc->parallel_dirops = 1; | |
5e940c1d MS |
916 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
917 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
918 | if (arg->time_gran && arg->time_gran <= 1000000000) |
919 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 920 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 921 | fc->default_permissions = 1; |
60bcc88a SF |
922 | fc->posix_acl = 1; |
923 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
924 | } | |
71421259 | 925 | } else { |
09cbfeaf | 926 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 927 | fc->no_lock = 1; |
37fb3a30 | 928 | fc->no_flock = 1; |
71421259 | 929 | } |
9cd68455 MS |
930 | |
931 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
932 | fc->minor = arg->minor; |
933 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 934 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 935 | fc->conn_init = 1; |
9b9a0469 | 936 | } |
9759bd51 | 937 | fuse_set_initialized(fc); |
08a53cdc | 938 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
939 | } |
940 | ||
ce1d5a49 | 941 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 942 | { |
9b9a0469 | 943 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 944 | |
9b9a0469 MS |
945 | arg->major = FUSE_KERNEL_VERSION; |
946 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
09cbfeaf | 947 | arg->max_readahead = fc->bdi.ra_pages * PAGE_SIZE; |
78bb6cb9 | 948 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 949 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 950 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 951 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 952 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 953 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
60bcc88a | 954 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL; |
9b9a0469 MS |
955 | req->in.h.opcode = FUSE_INIT; |
956 | req->in.numargs = 1; | |
957 | req->in.args[0].size = sizeof(*arg); | |
958 | req->in.args[0].value = arg; | |
959 | req->out.numargs = 1; | |
3ad2f3fb | 960 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
961 | with interface version < 7.5. Rest of init_out is zeroed |
962 | by do_get_request(), so a short reply is not a problem */ | |
963 | req->out.argvar = 1; | |
964 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
965 | req->out.args[0].value = &req->misc.init_out; | |
966 | req->end = process_init_reply; | |
b93f858a | 967 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
968 | } |
969 | ||
43901aab TH |
970 | static void fuse_free_conn(struct fuse_conn *fc) |
971 | { | |
cc080e9e | 972 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 973 | kfree_rcu(fc, rcu); |
43901aab TH |
974 | } |
975 | ||
a325f9b9 TH |
976 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
977 | { | |
978 | int err; | |
979 | ||
d993831f | 980 | fc->bdi.name = "fuse"; |
09cbfeaf | 981 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
a325f9b9 | 982 | /* fuse does it's own writeback accounting */ |
5a537485 | 983 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; |
a325f9b9 TH |
984 | |
985 | err = bdi_init(&fc->bdi); | |
986 | if (err) | |
987 | return err; | |
988 | ||
989 | fc->bdi_initialized = 1; | |
990 | ||
991 | if (sb->s_bdev) { | |
992 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
993 | MAJOR(fc->dev), MINOR(fc->dev)); | |
994 | } else { | |
995 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
996 | } | |
997 | ||
998 | if (err) | |
999 | return err; | |
1000 | ||
1001 | /* | |
1002 | * For a single fuse filesystem use max 1% of dirty + | |
1003 | * writeback threshold. | |
1004 | * | |
1005 | * This gives about 1M of write buffer for memory maps on a | |
1006 | * machine with 1G and 10% dirty_ratio, which should be more | |
1007 | * than enough. | |
1008 | * | |
1009 | * Privileged users can raise it by writing to | |
1010 | * | |
1011 | * /sys/class/bdi/<bdi>/max_ratio | |
1012 | */ | |
1013 | bdi_set_max_ratio(&fc->bdi, 1); | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
cc080e9e MS |
1018 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1019 | { | |
1020 | struct fuse_dev *fud; | |
1021 | ||
1022 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
1023 | if (fud) { | |
1024 | fud->fc = fuse_conn_get(fc); | |
c3696046 | 1025 | fuse_pqueue_init(&fud->pq); |
cc080e9e MS |
1026 | |
1027 | spin_lock(&fc->lock); | |
1028 | list_add_tail(&fud->entry, &fc->devices); | |
1029 | spin_unlock(&fc->lock); | |
1030 | } | |
1031 | ||
1032 | return fud; | |
1033 | } | |
1034 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1035 | ||
1036 | void fuse_dev_free(struct fuse_dev *fud) | |
1037 | { | |
1038 | struct fuse_conn *fc = fud->fc; | |
1039 | ||
1040 | if (fc) { | |
1041 | spin_lock(&fc->lock); | |
1042 | list_del(&fud->entry); | |
1043 | spin_unlock(&fc->lock); | |
1044 | ||
1045 | fuse_conn_put(fc); | |
1046 | } | |
1047 | kfree(fud); | |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1050 | ||
d8a5ba45 MS |
1051 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
1052 | { | |
cc080e9e | 1053 | struct fuse_dev *fud; |
d8a5ba45 MS |
1054 | struct fuse_conn *fc; |
1055 | struct inode *root; | |
1056 | struct fuse_mount_data d; | |
1057 | struct file *file; | |
f543f253 | 1058 | struct dentry *root_dentry; |
ce1d5a49 | 1059 | struct fuse_req *init_req; |
d8a5ba45 | 1060 | int err; |
d8091614 | 1061 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1062 | |
c2b8f006 | 1063 | err = -EINVAL; |
71421259 | 1064 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 1065 | goto err; |
71421259 | 1066 | |
4ace1f85 | 1067 | sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); |
9e1f1de0 | 1068 | |
7b3d8bf7 | 1069 | if (!parse_fuse_opt(data, &d, is_bdev)) |
c2b8f006 | 1070 | goto err; |
d8a5ba45 | 1071 | |
d8091614 | 1072 | if (is_bdev) { |
875d95ec | 1073 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1074 | err = -EINVAL; |
d8091614 | 1075 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1076 | goto err; |
875d95ec | 1077 | #endif |
d8091614 | 1078 | } else { |
09cbfeaf KS |
1079 | sb->s_blocksize = PAGE_SIZE; |
1080 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1081 | } |
d8a5ba45 MS |
1082 | sb->s_magic = FUSE_SUPER_MAGIC; |
1083 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1084 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1085 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1086 | sb->s_time_gran = 1; |
dbd561d2 | 1087 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1088 | |
1089 | file = fget(d.fd); | |
c2b8f006 | 1090 | err = -EINVAL; |
d8a5ba45 | 1091 | if (!file) |
c2b8f006 | 1092 | goto err; |
d8a5ba45 | 1093 | |
499dcf20 EB |
1094 | if ((file->f_op != &fuse_dev_operations) || |
1095 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1096 | goto err_fput; |
0720b315 | 1097 | |
0d179aa5 | 1098 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1099 | err = -ENOMEM; |
1100 | if (!fc) | |
1101 | goto err_fput; | |
d8a5ba45 | 1102 | |
a325f9b9 | 1103 | fuse_conn_init(fc); |
0ad0b325 | 1104 | fc->release = fuse_free_conn; |
a325f9b9 | 1105 | |
cc080e9e MS |
1106 | fud = fuse_dev_alloc(fc); |
1107 | if (!fud) | |
1108 | goto err_put_conn; | |
1109 | ||
a325f9b9 | 1110 | fc->dev = sb->s_dev; |
3b463ae0 | 1111 | fc->sb = sb; |
a325f9b9 TH |
1112 | err = fuse_bdi_init(fc, sb); |
1113 | if (err) | |
cc080e9e | 1114 | goto err_dev_free; |
0d179aa5 | 1115 | |
32a88aa1 JA |
1116 | sb->s_bdi = &fc->bdi; |
1117 | ||
e0a43ddc MS |
1118 | /* Handle umasking inside the fuse code */ |
1119 | if (sb->s_flags & MS_POSIXACL) | |
1120 | fc->dont_mask = 1; | |
1121 | sb->s_flags |= MS_POSIXACL; | |
1122 | ||
29433a29 MS |
1123 | fc->default_permissions = d.default_permissions; |
1124 | fc->allow_other = d.allow_other; | |
d8a5ba45 | 1125 | fc->user_id = d.user_id; |
87729a55 | 1126 | fc->group_id = d.group_id; |
f948d564 | 1127 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1128 | |
f543f253 MS |
1129 | /* Used by get_root_inode() */ |
1130 | sb->s_fs_info = fc; | |
1131 | ||
d8a5ba45 | 1132 | err = -ENOMEM; |
b93f858a | 1133 | root = fuse_get_root_inode(sb, d.rootmode); |
0ce267ff | 1134 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1135 | root_dentry = d_make_root(root); |
1136 | if (!root_dentry) | |
cc080e9e | 1137 | goto err_dev_free; |
0ce267ff | 1138 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1139 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1140 | |
4250c066 | 1141 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1142 | if (!init_req) |
1143 | goto err_put_root; | |
825d6d33 | 1144 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1145 | |
0ec7ca41 | 1146 | if (is_bdev) { |
4250c066 | 1147 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1148 | if (!fc->destroy_req) |
17e18ab6 | 1149 | goto err_free_init_req; |
0ec7ca41 MS |
1150 | } |
1151 | ||
bafa9654 | 1152 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1153 | err = -EINVAL; |
1154 | if (file->private_data) | |
bafa9654 | 1155 | goto err_unlock; |
8aa09a50 | 1156 | |
bafa9654 MS |
1157 | err = fuse_ctl_add_conn(fc); |
1158 | if (err) | |
1159 | goto err_unlock; | |
1160 | ||
1161 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1162 | sb->s_root = root_dentry; |
cc080e9e | 1163 | file->private_data = fud; |
bafa9654 | 1164 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1165 | /* |
1166 | * atomic_dec_and_test() in fput() provides the necessary | |
1167 | * memory barrier for file->private_data to be visible on all | |
1168 | * CPUs after this | |
1169 | */ | |
1170 | fput(file); | |
f543f253 | 1171 | |
ce1d5a49 | 1172 | fuse_send_init(fc, init_req); |
f543f253 | 1173 | |
d8a5ba45 MS |
1174 | return 0; |
1175 | ||
bafa9654 MS |
1176 | err_unlock: |
1177 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1178 | err_free_init_req: |
ce1d5a49 | 1179 | fuse_request_free(init_req); |
f543f253 MS |
1180 | err_put_root: |
1181 | dput(root_dentry); | |
cc080e9e MS |
1182 | err_dev_free: |
1183 | fuse_dev_free(fud); | |
c2b8f006 | 1184 | err_put_conn: |
a325f9b9 | 1185 | fuse_bdi_destroy(fc); |
bafa9654 | 1186 | fuse_conn_put(fc); |
c2b8f006 MS |
1187 | err_fput: |
1188 | fput(file); | |
1189 | err: | |
d8a5ba45 MS |
1190 | return err; |
1191 | } | |
1192 | ||
3c26ff6e | 1193 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1194 | int flags, const char *dev_name, |
3c26ff6e | 1195 | void *raw_data) |
d8a5ba45 | 1196 | { |
3c26ff6e | 1197 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1198 | } |
1199 | ||
3b463ae0 JM |
1200 | static void fuse_kill_sb_anon(struct super_block *sb) |
1201 | { | |
1202 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1203 | ||
1204 | if (fc) { | |
1205 | down_write(&fc->killsb); | |
1206 | fc->sb = NULL; | |
1207 | up_write(&fc->killsb); | |
1208 | } | |
1209 | ||
1210 | kill_anon_super(sb); | |
1211 | } | |
1212 | ||
875d95ec MS |
1213 | static struct file_system_type fuse_fs_type = { |
1214 | .owner = THIS_MODULE, | |
1215 | .name = "fuse", | |
79c0b2df | 1216 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1217 | .mount = fuse_mount, |
3b463ae0 | 1218 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1219 | }; |
7f78e035 | 1220 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1221 | |
1222 | #ifdef CONFIG_BLOCK | |
152a0836 | 1223 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1224 | int flags, const char *dev_name, |
152a0836 | 1225 | void *raw_data) |
d6392f87 | 1226 | { |
152a0836 | 1227 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1228 | } |
1229 | ||
3b463ae0 JM |
1230 | static void fuse_kill_sb_blk(struct super_block *sb) |
1231 | { | |
1232 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1233 | ||
1234 | if (fc) { | |
1235 | down_write(&fc->killsb); | |
1236 | fc->sb = NULL; | |
1237 | up_write(&fc->killsb); | |
1238 | } | |
1239 | ||
1240 | kill_block_super(sb); | |
1241 | } | |
1242 | ||
d6392f87 MS |
1243 | static struct file_system_type fuseblk_fs_type = { |
1244 | .owner = THIS_MODULE, | |
1245 | .name = "fuseblk", | |
152a0836 | 1246 | .mount = fuse_mount_blk, |
3b463ae0 | 1247 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1248 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1249 | }; |
7f78e035 | 1250 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1251 | |
875d95ec MS |
1252 | static inline int register_fuseblk(void) |
1253 | { | |
1254 | return register_filesystem(&fuseblk_fs_type); | |
1255 | } | |
1256 | ||
1257 | static inline void unregister_fuseblk(void) | |
1258 | { | |
1259 | unregister_filesystem(&fuseblk_fs_type); | |
1260 | } | |
1261 | #else | |
1262 | static inline int register_fuseblk(void) | |
1263 | { | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | static inline void unregister_fuseblk(void) | |
1268 | { | |
1269 | } | |
1270 | #endif | |
1271 | ||
51cc5068 | 1272 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1273 | { |
1729a16c | 1274 | struct inode *inode = foo; |
d8a5ba45 | 1275 | |
a35afb83 | 1276 | inode_init_once(inode); |
d8a5ba45 MS |
1277 | } |
1278 | ||
1279 | static int __init fuse_fs_init(void) | |
1280 | { | |
1281 | int err; | |
1282 | ||
d6392f87 | 1283 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
5d097056 VD |
1284 | sizeof(struct fuse_inode), 0, |
1285 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, | |
20c2df83 | 1286 | fuse_inode_init_once); |
d6392f87 MS |
1287 | err = -ENOMEM; |
1288 | if (!fuse_inode_cachep) | |
988f0325 AV |
1289 | goto out; |
1290 | ||
1291 | err = register_fuseblk(); | |
1292 | if (err) | |
1293 | goto out2; | |
1294 | ||
1295 | err = register_filesystem(&fuse_fs_type); | |
1296 | if (err) | |
1297 | goto out3; | |
d6392f87 MS |
1298 | |
1299 | return 0; | |
d8a5ba45 | 1300 | |
988f0325 | 1301 | out3: |
875d95ec | 1302 | unregister_fuseblk(); |
988f0325 AV |
1303 | out2: |
1304 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1305 | out: |
d8a5ba45 MS |
1306 | return err; |
1307 | } | |
1308 | ||
1309 | static void fuse_fs_cleanup(void) | |
1310 | { | |
1311 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1312 | unregister_fuseblk(); |
8c0a8537 KS |
1313 | |
1314 | /* | |
1315 | * Make sure all delayed rcu free inodes are flushed before we | |
1316 | * destroy cache. | |
1317 | */ | |
1318 | rcu_barrier(); | |
d8a5ba45 MS |
1319 | kmem_cache_destroy(fuse_inode_cachep); |
1320 | } | |
1321 | ||
5c89e17e | 1322 | static struct kobject *fuse_kobj; |
5c89e17e | 1323 | |
f543f253 MS |
1324 | static int fuse_sysfs_init(void) |
1325 | { | |
1326 | int err; | |
1327 | ||
00d26666 | 1328 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1329 | if (!fuse_kobj) { |
1330 | err = -ENOMEM; | |
f543f253 | 1331 | goto out_err; |
5c89e17e | 1332 | } |
f543f253 | 1333 | |
f9bb4882 EB |
1334 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1335 | if (err) | |
f543f253 MS |
1336 | goto out_fuse_unregister; |
1337 | ||
1338 | return 0; | |
1339 | ||
1340 | out_fuse_unregister: | |
197b12d6 | 1341 | kobject_put(fuse_kobj); |
f543f253 MS |
1342 | out_err: |
1343 | return err; | |
1344 | } | |
1345 | ||
1346 | static void fuse_sysfs_cleanup(void) | |
1347 | { | |
f9bb4882 | 1348 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1349 | kobject_put(fuse_kobj); |
f543f253 MS |
1350 | } |
1351 | ||
d8a5ba45 MS |
1352 | static int __init fuse_init(void) |
1353 | { | |
1354 | int res; | |
1355 | ||
1729a16c | 1356 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1357 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1358 | ||
bafa9654 | 1359 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1360 | res = fuse_fs_init(); |
1361 | if (res) | |
1362 | goto err; | |
1363 | ||
334f485d MS |
1364 | res = fuse_dev_init(); |
1365 | if (res) | |
1366 | goto err_fs_cleanup; | |
1367 | ||
f543f253 MS |
1368 | res = fuse_sysfs_init(); |
1369 | if (res) | |
1370 | goto err_dev_cleanup; | |
1371 | ||
bafa9654 MS |
1372 | res = fuse_ctl_init(); |
1373 | if (res) | |
1374 | goto err_sysfs_cleanup; | |
1375 | ||
487ea5af CH |
1376 | sanitize_global_limit(&max_user_bgreq); |
1377 | sanitize_global_limit(&max_user_congthresh); | |
1378 | ||
d8a5ba45 MS |
1379 | return 0; |
1380 | ||
bafa9654 MS |
1381 | err_sysfs_cleanup: |
1382 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1383 | err_dev_cleanup: |
1384 | fuse_dev_cleanup(); | |
334f485d MS |
1385 | err_fs_cleanup: |
1386 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1387 | err: |
1388 | return res; | |
1389 | } | |
1390 | ||
1391 | static void __exit fuse_exit(void) | |
1392 | { | |
1393 | printk(KERN_DEBUG "fuse exit\n"); | |
1394 | ||
bafa9654 | 1395 | fuse_ctl_cleanup(); |
f543f253 | 1396 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1397 | fuse_fs_cleanup(); |
334f485d | 1398 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1399 | } |
1400 | ||
1401 | module_init(fuse_init); | |
1402 | module_exit(fuse_exit); |