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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> |
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 TH |
389 | static void fuse_put_super(struct super_block *sb) |
390 | { | |
391 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
392 | ||
393 | fuse_send_destroy(fc); | |
bbd99797 | 394 | |
580640ba | 395 | fuse_abort_conn(fc); |
bbd99797 MS |
396 | mutex_lock(&fuse_mutex); |
397 | list_del(&fc->entry); | |
398 | fuse_ctl_remove_conn(fc); | |
399 | mutex_unlock(&fuse_mutex); | |
bbd99797 | 400 | |
bafa9654 | 401 | fuse_conn_put(fc); |
d8a5ba45 MS |
402 | } |
403 | ||
e5e5558e MS |
404 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
405 | { | |
406 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
407 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 408 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
409 | stbuf->f_blocks = attr->blocks; |
410 | stbuf->f_bfree = attr->bfree; | |
411 | stbuf->f_bavail = attr->bavail; | |
412 | stbuf->f_files = attr->files; | |
413 | stbuf->f_ffree = attr->ffree; | |
414 | stbuf->f_namelen = attr->namelen; | |
415 | /* fsid is left zero */ | |
416 | } | |
417 | ||
726c3342 | 418 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 419 | { |
726c3342 | 420 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 421 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 422 | FUSE_ARGS(args); |
e5e5558e MS |
423 | struct fuse_statfs_out outarg; |
424 | int err; | |
425 | ||
c2132c1b | 426 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
427 | buf->f_type = FUSE_SUPER_MAGIC; |
428 | return 0; | |
429 | } | |
430 | ||
de5f1202 | 431 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
432 | args.in.numargs = 0; |
433 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 434 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 435 | args.out.numargs = 1; |
21f62174 | 436 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
437 | args.out.args[0].value = &outarg; |
438 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
439 | if (!err) |
440 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
441 | return err; |
442 | } | |
443 | ||
d8a5ba45 MS |
444 | enum { |
445 | OPT_FD, | |
446 | OPT_ROOTMODE, | |
447 | OPT_USER_ID, | |
87729a55 | 448 | OPT_GROUP_ID, |
d8a5ba45 MS |
449 | OPT_DEFAULT_PERMISSIONS, |
450 | OPT_ALLOW_OTHER, | |
db50b96c | 451 | OPT_MAX_READ, |
d8091614 | 452 | OPT_BLKSIZE, |
d8a5ba45 MS |
453 | OPT_ERR |
454 | }; | |
455 | ||
a447c093 | 456 | static const match_table_t tokens = { |
d8a5ba45 MS |
457 | {OPT_FD, "fd=%u"}, |
458 | {OPT_ROOTMODE, "rootmode=%o"}, | |
459 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 460 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
461 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
462 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 463 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 464 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
465 | {OPT_ERR, NULL} |
466 | }; | |
467 | ||
233a01fa MS |
468 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
469 | { | |
470 | int err = -ENOMEM; | |
471 | char *buf = match_strdup(s); | |
472 | if (buf) { | |
473 | err = kstrtouint(buf, 10, res); | |
474 | kfree(buf); | |
475 | } | |
476 | return err; | |
477 | } | |
478 | ||
d8091614 | 479 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
480 | { |
481 | char *p; | |
482 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 483 | d->max_read = ~0; |
d1875dba | 484 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
485 | |
486 | while ((p = strsep(&opt, ",")) != NULL) { | |
487 | int token; | |
488 | int value; | |
233a01fa | 489 | unsigned uv; |
d8a5ba45 MS |
490 | substring_t args[MAX_OPT_ARGS]; |
491 | if (!*p) | |
492 | continue; | |
493 | ||
494 | token = match_token(p, tokens, args); | |
495 | switch (token) { | |
496 | case OPT_FD: | |
497 | if (match_int(&args[0], &value)) | |
498 | return 0; | |
499 | d->fd = value; | |
5a533682 | 500 | d->fd_present = 1; |
d8a5ba45 MS |
501 | break; |
502 | ||
503 | case OPT_ROOTMODE: | |
504 | if (match_octal(&args[0], &value)) | |
505 | return 0; | |
a5bfffac TS |
506 | if (!fuse_valid_type(value)) |
507 | return 0; | |
d8a5ba45 | 508 | d->rootmode = value; |
5a533682 | 509 | d->rootmode_present = 1; |
d8a5ba45 MS |
510 | break; |
511 | ||
512 | case OPT_USER_ID: | |
233a01fa | 513 | if (fuse_match_uint(&args[0], &uv)) |
d8a5ba45 | 514 | return 0; |
233a01fa | 515 | d->user_id = make_kuid(current_user_ns(), uv); |
499dcf20 EB |
516 | if (!uid_valid(d->user_id)) |
517 | return 0; | |
5a533682 | 518 | d->user_id_present = 1; |
d8a5ba45 MS |
519 | break; |
520 | ||
87729a55 | 521 | case OPT_GROUP_ID: |
233a01fa | 522 | if (fuse_match_uint(&args[0], &uv)) |
87729a55 | 523 | return 0; |
233a01fa | 524 | d->group_id = make_kgid(current_user_ns(), uv); |
499dcf20 EB |
525 | if (!gid_valid(d->group_id)) |
526 | return 0; | |
5a533682 | 527 | d->group_id_present = 1; |
87729a55 MS |
528 | break; |
529 | ||
1e9a4ed9 | 530 | case OPT_DEFAULT_PERMISSIONS: |
29433a29 | 531 | d->default_permissions = 1; |
1e9a4ed9 MS |
532 | break; |
533 | ||
534 | case OPT_ALLOW_OTHER: | |
29433a29 | 535 | d->allow_other = 1; |
1e9a4ed9 MS |
536 | break; |
537 | ||
db50b96c MS |
538 | case OPT_MAX_READ: |
539 | if (match_int(&args[0], &value)) | |
540 | return 0; | |
541 | d->max_read = value; | |
542 | break; | |
543 | ||
d8091614 MS |
544 | case OPT_BLKSIZE: |
545 | if (!is_bdev || match_int(&args[0], &value)) | |
546 | return 0; | |
547 | d->blksize = value; | |
548 | break; | |
549 | ||
d8a5ba45 MS |
550 | default: |
551 | return 0; | |
552 | } | |
553 | } | |
5a533682 MS |
554 | |
555 | if (!d->fd_present || !d->rootmode_present || | |
556 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
557 | return 0; |
558 | ||
559 | return 1; | |
560 | } | |
561 | ||
34c80b1d | 562 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 563 | { |
34c80b1d AV |
564 | struct super_block *sb = root->d_sb; |
565 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 566 | |
499dcf20 EB |
567 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
568 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
29433a29 | 569 | if (fc->default_permissions) |
1e9a4ed9 | 570 | seq_puts(m, ",default_permissions"); |
29433a29 | 571 | if (fc->allow_other) |
1e9a4ed9 | 572 | seq_puts(m, ",allow_other"); |
db50b96c MS |
573 | if (fc->max_read != ~0) |
574 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
575 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
576 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
577 | return 0; |
578 | } | |
579 | ||
f88996a9 MS |
580 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
581 | { | |
582 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
583 | init_waitqueue_head(&fiq->waitq); | |
584 | INIT_LIST_HEAD(&fiq->pending); | |
585 | INIT_LIST_HEAD(&fiq->interrupts); | |
586 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 587 | fiq->connected = 1; |
f88996a9 MS |
588 | } |
589 | ||
3a2b5b9c MS |
590 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
591 | { | |
592 | memset(fpq, 0, sizeof(struct fuse_pqueue)); | |
45a91cb1 | 593 | spin_lock_init(&fpq->lock); |
3a2b5b9c MS |
594 | INIT_LIST_HEAD(&fpq->processing); |
595 | INIT_LIST_HEAD(&fpq->io); | |
e96edd94 | 596 | fpq->connected = 1; |
3a2b5b9c MS |
597 | } |
598 | ||
a325f9b9 | 599 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 600 | { |
0d179aa5 TH |
601 | memset(fc, 0, sizeof(*fc)); |
602 | spin_lock_init(&fc->lock); | |
3b463ae0 | 603 | init_rwsem(&fc->killsb); |
0d179aa5 | 604 | atomic_set(&fc->count, 1); |
c3696046 | 605 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
606 | init_waitqueue_head(&fc->blocked_waitq); |
607 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 608 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
609 | INIT_LIST_HEAD(&fc->bg_queue); |
610 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 611 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 612 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
613 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
614 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
615 | fc->khctr = 0; |
616 | fc->polled_files = RB_ROOT; | |
0aada884 | 617 | fc->blocked = 0; |
796523fb | 618 | fc->initialized = 0; |
e16714d8 | 619 | fc->connected = 1; |
0d179aa5 TH |
620 | fc->attr_version = 1; |
621 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 622 | } |
0d179aa5 | 623 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 624 | |
bafa9654 MS |
625 | void fuse_conn_put(struct fuse_conn *fc) |
626 | { | |
d2a85164 | 627 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
628 | if (fc->destroy_req) |
629 | fuse_request_free(fc->destroy_req); | |
43901aab | 630 | fc->release(fc); |
d2a85164 | 631 | } |
bafa9654 | 632 | } |
08cbf542 | 633 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
634 | |
635 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
636 | { | |
637 | atomic_inc(&fc->count); | |
638 | return fc; | |
639 | } | |
08cbf542 | 640 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 641 | |
b93f858a | 642 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
643 | { |
644 | struct fuse_attr attr; | |
645 | memset(&attr, 0, sizeof(attr)); | |
646 | ||
647 | attr.mode = mode; | |
648 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 649 | attr.nlink = 1; |
1fb69e78 | 650 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
651 | } |
652 | ||
1729a16c | 653 | struct fuse_inode_handle { |
dbd561d2 MS |
654 | u64 nodeid; |
655 | u32 generation; | |
656 | }; | |
657 | ||
658 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
659 | struct fuse_inode_handle *handle) | |
660 | { | |
33670fa2 | 661 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
662 | struct inode *inode; |
663 | struct dentry *entry; | |
664 | int err = -ESTALE; | |
665 | ||
666 | if (handle->nodeid == 0) | |
667 | goto out_err; | |
668 | ||
669 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
670 | if (!inode) { |
671 | struct fuse_entry_out outarg; | |
13983d06 | 672 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
673 | |
674 | if (!fc->export_support) | |
675 | goto out_err; | |
676 | ||
33670fa2 MS |
677 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
678 | &inode); | |
679 | if (err && err != -ENOENT) | |
680 | goto out_err; | |
681 | if (err || !inode) { | |
682 | err = -ESTALE; | |
683 | goto out_err; | |
684 | } | |
685 | err = -EIO; | |
686 | if (get_node_id(inode) != handle->nodeid) | |
687 | goto out_iput; | |
688 | } | |
dbd561d2 MS |
689 | err = -ESTALE; |
690 | if (inode->i_generation != handle->generation) | |
691 | goto out_iput; | |
692 | ||
44003728 | 693 | entry = d_obtain_alias(inode); |
c35eebe9 | 694 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 695 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
696 | |
697 | return entry; | |
698 | ||
699 | out_iput: | |
700 | iput(inode); | |
701 | out_err: | |
702 | return ERR_PTR(err); | |
703 | } | |
704 | ||
b0b0382b AV |
705 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
706 | struct inode *parent) | |
dbd561d2 | 707 | { |
b0b0382b | 708 | int len = parent ? 6 : 3; |
dbd561d2 MS |
709 | u64 nodeid; |
710 | u32 generation; | |
711 | ||
5fe0c237 AK |
712 | if (*max_len < len) { |
713 | *max_len = len; | |
94e07a75 | 714 | return FILEID_INVALID; |
5fe0c237 | 715 | } |
dbd561d2 MS |
716 | |
717 | nodeid = get_fuse_inode(inode)->nodeid; | |
718 | generation = inode->i_generation; | |
719 | ||
720 | fh[0] = (u32)(nodeid >> 32); | |
721 | fh[1] = (u32)(nodeid & 0xffffffff); | |
722 | fh[2] = generation; | |
723 | ||
b0b0382b | 724 | if (parent) { |
dbd561d2 MS |
725 | nodeid = get_fuse_inode(parent)->nodeid; |
726 | generation = parent->i_generation; | |
dbd561d2 MS |
727 | |
728 | fh[3] = (u32)(nodeid >> 32); | |
729 | fh[4] = (u32)(nodeid & 0xffffffff); | |
730 | fh[5] = generation; | |
731 | } | |
732 | ||
733 | *max_len = len; | |
b0b0382b | 734 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
735 | } |
736 | ||
737 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
738 | struct fid *fid, int fh_len, int fh_type) | |
739 | { | |
740 | struct fuse_inode_handle handle; | |
741 | ||
742 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
743 | return NULL; | |
744 | ||
745 | handle.nodeid = (u64) fid->raw[0] << 32; | |
746 | handle.nodeid |= (u64) fid->raw[1]; | |
747 | handle.generation = fid->raw[2]; | |
748 | return fuse_get_dentry(sb, &handle); | |
749 | } | |
750 | ||
751 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
752 | struct fid *fid, int fh_len, int fh_type) | |
753 | { | |
754 | struct fuse_inode_handle parent; | |
755 | ||
756 | if (fh_type != 0x82 || fh_len < 6) | |
757 | return NULL; | |
758 | ||
759 | parent.nodeid = (u64) fid->raw[3] << 32; | |
760 | parent.nodeid |= (u64) fid->raw[4]; | |
761 | parent.generation = fid->raw[5]; | |
762 | return fuse_get_dentry(sb, &parent); | |
763 | } | |
764 | ||
33670fa2 MS |
765 | static struct dentry *fuse_get_parent(struct dentry *child) |
766 | { | |
2b0143b5 | 767 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
768 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
769 | struct inode *inode; | |
770 | struct dentry *parent; | |
771 | struct fuse_entry_out outarg; | |
13983d06 | 772 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
773 | int err; |
774 | ||
775 | if (!fc->export_support) | |
776 | return ERR_PTR(-ESTALE); | |
777 | ||
33670fa2 MS |
778 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
779 | &name, &outarg, &inode); | |
44003728 CH |
780 | if (err) { |
781 | if (err == -ENOENT) | |
782 | return ERR_PTR(-ESTALE); | |
33670fa2 | 783 | return ERR_PTR(err); |
33670fa2 | 784 | } |
44003728 CH |
785 | |
786 | parent = d_obtain_alias(inode); | |
c35eebe9 | 787 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 788 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
789 | |
790 | return parent; | |
791 | } | |
dbd561d2 MS |
792 | |
793 | static const struct export_operations fuse_export_operations = { | |
794 | .fh_to_dentry = fuse_fh_to_dentry, | |
795 | .fh_to_parent = fuse_fh_to_parent, | |
796 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 797 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
798 | }; |
799 | ||
ee9b6d61 | 800 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
801 | .alloc_inode = fuse_alloc_inode, |
802 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 803 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 804 | .write_inode = fuse_write_inode, |
ead5f0b5 | 805 | .drop_inode = generic_delete_inode, |
71421259 | 806 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 807 | .put_super = fuse_put_super, |
69a53bf2 | 808 | .umount_begin = fuse_umount_begin, |
e5e5558e | 809 | .statfs = fuse_statfs, |
d8a5ba45 MS |
810 | .show_options = fuse_show_options, |
811 | }; | |
812 | ||
487ea5af CH |
813 | static void sanitize_global_limit(unsigned *limit) |
814 | { | |
815 | if (*limit == 0) | |
0ed5fd13 | 816 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
817 | sizeof(struct fuse_req); |
818 | ||
819 | if (*limit >= 1 << 16) | |
820 | *limit = (1 << 16) - 1; | |
821 | } | |
822 | ||
823 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
824 | { | |
825 | int rv; | |
826 | ||
827 | rv = param_set_uint(val, kp); | |
828 | if (rv) | |
829 | return rv; | |
830 | ||
831 | sanitize_global_limit((unsigned *)kp->arg); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
837 | { | |
838 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
839 | ||
840 | if (arg->minor < 13) | |
841 | return; | |
842 | ||
843 | sanitize_global_limit(&max_user_bgreq); | |
844 | sanitize_global_limit(&max_user_congthresh); | |
845 | ||
846 | if (arg->max_background) { | |
847 | fc->max_background = arg->max_background; | |
848 | ||
849 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
850 | fc->max_background = max_user_bgreq; | |
851 | } | |
852 | if (arg->congestion_threshold) { | |
853 | fc->congestion_threshold = arg->congestion_threshold; | |
854 | ||
855 | if (!cap_sys_admin && | |
856 | fc->congestion_threshold > max_user_congthresh) | |
857 | fc->congestion_threshold = max_user_congthresh; | |
858 | } | |
859 | } | |
860 | ||
9b9a0469 MS |
861 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
862 | { | |
9b9a0469 MS |
863 | struct fuse_init_out *arg = &req->misc.init_out; |
864 | ||
865 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
866 | fc->conn_error = 1; | |
867 | else { | |
9cd68455 MS |
868 | unsigned long ra_pages; |
869 | ||
487ea5af CH |
870 | process_init_limits(fc, arg); |
871 | ||
9cd68455 | 872 | if (arg->minor >= 6) { |
09cbfeaf | 873 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
874 | if (arg->flags & FUSE_ASYNC_READ) |
875 | fc->async_read = 1; | |
71421259 MS |
876 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
877 | fc->no_lock = 1; | |
37fb3a30 MS |
878 | if (arg->minor >= 17) { |
879 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
880 | fc->no_flock = 1; | |
24114504 MS |
881 | } else { |
882 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
883 | fc->no_flock = 1; | |
37fb3a30 | 884 | } |
6ff958ed MS |
885 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
886 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
887 | if (arg->minor >= 9) { |
888 | /* LOOKUP has dependency on proto version */ | |
889 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
890 | fc->export_support = 1; | |
891 | } | |
78bb6cb9 MS |
892 | if (arg->flags & FUSE_BIG_WRITES) |
893 | fc->big_writes = 1; | |
e0a43ddc MS |
894 | if (arg->flags & FUSE_DONT_MASK) |
895 | fc->dont_mask = 1; | |
72d0d248 BF |
896 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
897 | fc->auto_inval_data = 1; | |
28420dad | 898 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 899 | fc->do_readdirplus = 1; |
28420dad MS |
900 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
901 | fc->readdirplus_auto = 1; | |
902 | } | |
60b9df7a MS |
903 | if (arg->flags & FUSE_ASYNC_DIO) |
904 | fc->async_dio = 1; | |
4d99ff8f PE |
905 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
906 | fc->writeback_cache = 1; | |
5c672ab3 MS |
907 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
908 | fc->parallel_dirops = 1; | |
5e940c1d MS |
909 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
910 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
911 | if (arg->time_gran && arg->time_gran <= 1000000000) |
912 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 913 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 914 | fc->default_permissions = 1; |
60bcc88a SF |
915 | fc->posix_acl = 1; |
916 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
917 | } | |
71421259 | 918 | } else { |
09cbfeaf | 919 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 920 | fc->no_lock = 1; |
37fb3a30 | 921 | fc->no_flock = 1; |
71421259 | 922 | } |
9cd68455 | 923 | |
5f7f7543 JK |
924 | fc->sb->s_bdi->ra_pages = |
925 | min(fc->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
926 | fc->minor = arg->minor; |
927 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 928 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 929 | fc->conn_init = 1; |
9b9a0469 | 930 | } |
9759bd51 | 931 | fuse_set_initialized(fc); |
08a53cdc | 932 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
933 | } |
934 | ||
ce1d5a49 | 935 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 936 | { |
9b9a0469 | 937 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 938 | |
9b9a0469 MS |
939 | arg->major = FUSE_KERNEL_VERSION; |
940 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
5f7f7543 | 941 | arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; |
78bb6cb9 | 942 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 943 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 944 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 945 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 946 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 947 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
60bcc88a | 948 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL; |
9b9a0469 MS |
949 | req->in.h.opcode = FUSE_INIT; |
950 | req->in.numargs = 1; | |
951 | req->in.args[0].size = sizeof(*arg); | |
952 | req->in.args[0].value = arg; | |
953 | req->out.numargs = 1; | |
3ad2f3fb | 954 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
955 | with interface version < 7.5. Rest of init_out is zeroed |
956 | by do_get_request(), so a short reply is not a problem */ | |
957 | req->out.argvar = 1; | |
958 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
959 | req->out.args[0].value = &req->misc.init_out; | |
960 | req->end = process_init_reply; | |
b93f858a | 961 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
962 | } |
963 | ||
43901aab TH |
964 | static void fuse_free_conn(struct fuse_conn *fc) |
965 | { | |
cc080e9e | 966 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 967 | kfree_rcu(fc, rcu); |
43901aab TH |
968 | } |
969 | ||
a325f9b9 TH |
970 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
971 | { | |
972 | int err; | |
5f7f7543 | 973 | char *suffix = ""; |
a325f9b9 | 974 | |
5f7f7543 JK |
975 | if (sb->s_bdev) |
976 | suffix = "-fuseblk"; | |
977 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), | |
978 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
979 | if (err) |
980 | return err; | |
981 | ||
5f7f7543 JK |
982 | sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
983 | /* fuse does it's own writeback accounting */ | |
984 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 985 | |
a325f9b9 TH |
986 | /* |
987 | * For a single fuse filesystem use max 1% of dirty + | |
988 | * writeback threshold. | |
989 | * | |
990 | * This gives about 1M of write buffer for memory maps on a | |
991 | * machine with 1G and 10% dirty_ratio, which should be more | |
992 | * than enough. | |
993 | * | |
994 | * Privileged users can raise it by writing to | |
995 | * | |
996 | * /sys/class/bdi/<bdi>/max_ratio | |
997 | */ | |
5f7f7543 | 998 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
999 | |
1000 | return 0; | |
1001 | } | |
1002 | ||
cc080e9e MS |
1003 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1004 | { | |
1005 | struct fuse_dev *fud; | |
1006 | ||
1007 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
1008 | if (fud) { | |
1009 | fud->fc = fuse_conn_get(fc); | |
c3696046 | 1010 | fuse_pqueue_init(&fud->pq); |
cc080e9e MS |
1011 | |
1012 | spin_lock(&fc->lock); | |
1013 | list_add_tail(&fud->entry, &fc->devices); | |
1014 | spin_unlock(&fc->lock); | |
1015 | } | |
1016 | ||
1017 | return fud; | |
1018 | } | |
1019 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1020 | ||
1021 | void fuse_dev_free(struct fuse_dev *fud) | |
1022 | { | |
1023 | struct fuse_conn *fc = fud->fc; | |
1024 | ||
1025 | if (fc) { | |
1026 | spin_lock(&fc->lock); | |
1027 | list_del(&fud->entry); | |
1028 | spin_unlock(&fc->lock); | |
1029 | ||
1030 | fuse_conn_put(fc); | |
1031 | } | |
1032 | kfree(fud); | |
1033 | } | |
1034 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1035 | ||
d8a5ba45 MS |
1036 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
1037 | { | |
cc080e9e | 1038 | struct fuse_dev *fud; |
d8a5ba45 MS |
1039 | struct fuse_conn *fc; |
1040 | struct inode *root; | |
1041 | struct fuse_mount_data d; | |
1042 | struct file *file; | |
f543f253 | 1043 | struct dentry *root_dentry; |
ce1d5a49 | 1044 | struct fuse_req *init_req; |
d8a5ba45 | 1045 | int err; |
d8091614 | 1046 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1047 | |
c2b8f006 | 1048 | err = -EINVAL; |
71421259 | 1049 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 1050 | goto err; |
71421259 | 1051 | |
4ace1f85 | 1052 | sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); |
9e1f1de0 | 1053 | |
7b3d8bf7 | 1054 | if (!parse_fuse_opt(data, &d, is_bdev)) |
c2b8f006 | 1055 | goto err; |
d8a5ba45 | 1056 | |
d8091614 | 1057 | if (is_bdev) { |
875d95ec | 1058 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1059 | err = -EINVAL; |
d8091614 | 1060 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1061 | goto err; |
875d95ec | 1062 | #endif |
d8091614 | 1063 | } else { |
09cbfeaf KS |
1064 | sb->s_blocksize = PAGE_SIZE; |
1065 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1066 | } |
d8a5ba45 MS |
1067 | sb->s_magic = FUSE_SUPER_MAGIC; |
1068 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1069 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1070 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1071 | sb->s_time_gran = 1; |
dbd561d2 | 1072 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1073 | |
1074 | file = fget(d.fd); | |
c2b8f006 | 1075 | err = -EINVAL; |
d8a5ba45 | 1076 | if (!file) |
c2b8f006 | 1077 | goto err; |
d8a5ba45 | 1078 | |
499dcf20 EB |
1079 | if ((file->f_op != &fuse_dev_operations) || |
1080 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1081 | goto err_fput; |
0720b315 | 1082 | |
0d179aa5 | 1083 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1084 | err = -ENOMEM; |
1085 | if (!fc) | |
1086 | goto err_fput; | |
d8a5ba45 | 1087 | |
a325f9b9 | 1088 | fuse_conn_init(fc); |
0ad0b325 | 1089 | fc->release = fuse_free_conn; |
a325f9b9 | 1090 | |
cc080e9e MS |
1091 | fud = fuse_dev_alloc(fc); |
1092 | if (!fud) | |
1093 | goto err_put_conn; | |
1094 | ||
a325f9b9 | 1095 | fc->dev = sb->s_dev; |
3b463ae0 | 1096 | fc->sb = sb; |
a325f9b9 TH |
1097 | err = fuse_bdi_init(fc, sb); |
1098 | if (err) | |
cc080e9e | 1099 | goto err_dev_free; |
0d179aa5 | 1100 | |
e0a43ddc MS |
1101 | /* Handle umasking inside the fuse code */ |
1102 | if (sb->s_flags & MS_POSIXACL) | |
1103 | fc->dont_mask = 1; | |
1104 | sb->s_flags |= MS_POSIXACL; | |
1105 | ||
29433a29 MS |
1106 | fc->default_permissions = d.default_permissions; |
1107 | fc->allow_other = d.allow_other; | |
d8a5ba45 | 1108 | fc->user_id = d.user_id; |
87729a55 | 1109 | fc->group_id = d.group_id; |
f948d564 | 1110 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1111 | |
f543f253 MS |
1112 | /* Used by get_root_inode() */ |
1113 | sb->s_fs_info = fc; | |
1114 | ||
d8a5ba45 | 1115 | err = -ENOMEM; |
b93f858a | 1116 | root = fuse_get_root_inode(sb, d.rootmode); |
0ce267ff | 1117 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1118 | root_dentry = d_make_root(root); |
1119 | if (!root_dentry) | |
cc080e9e | 1120 | goto err_dev_free; |
0ce267ff | 1121 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1122 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1123 | |
4250c066 | 1124 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1125 | if (!init_req) |
1126 | goto err_put_root; | |
825d6d33 | 1127 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1128 | |
0ec7ca41 | 1129 | if (is_bdev) { |
4250c066 | 1130 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1131 | if (!fc->destroy_req) |
17e18ab6 | 1132 | goto err_free_init_req; |
0ec7ca41 MS |
1133 | } |
1134 | ||
bafa9654 | 1135 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1136 | err = -EINVAL; |
1137 | if (file->private_data) | |
bafa9654 | 1138 | goto err_unlock; |
8aa09a50 | 1139 | |
bafa9654 MS |
1140 | err = fuse_ctl_add_conn(fc); |
1141 | if (err) | |
1142 | goto err_unlock; | |
1143 | ||
1144 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1145 | sb->s_root = root_dentry; |
cc080e9e | 1146 | file->private_data = fud; |
bafa9654 | 1147 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1148 | /* |
1149 | * atomic_dec_and_test() in fput() provides the necessary | |
1150 | * memory barrier for file->private_data to be visible on all | |
1151 | * CPUs after this | |
1152 | */ | |
1153 | fput(file); | |
f543f253 | 1154 | |
ce1d5a49 | 1155 | fuse_send_init(fc, init_req); |
f543f253 | 1156 | |
d8a5ba45 MS |
1157 | return 0; |
1158 | ||
bafa9654 MS |
1159 | err_unlock: |
1160 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1161 | err_free_init_req: |
ce1d5a49 | 1162 | fuse_request_free(init_req); |
f543f253 MS |
1163 | err_put_root: |
1164 | dput(root_dentry); | |
cc080e9e MS |
1165 | err_dev_free: |
1166 | fuse_dev_free(fud); | |
c2b8f006 | 1167 | err_put_conn: |
bafa9654 | 1168 | fuse_conn_put(fc); |
c2b8f006 MS |
1169 | err_fput: |
1170 | fput(file); | |
1171 | err: | |
d8a5ba45 MS |
1172 | return err; |
1173 | } | |
1174 | ||
3c26ff6e | 1175 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1176 | int flags, const char *dev_name, |
3c26ff6e | 1177 | void *raw_data) |
d8a5ba45 | 1178 | { |
3c26ff6e | 1179 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1180 | } |
1181 | ||
3b463ae0 JM |
1182 | static void fuse_kill_sb_anon(struct super_block *sb) |
1183 | { | |
1184 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1185 | ||
1186 | if (fc) { | |
1187 | down_write(&fc->killsb); | |
1188 | fc->sb = NULL; | |
1189 | up_write(&fc->killsb); | |
1190 | } | |
1191 | ||
1192 | kill_anon_super(sb); | |
1193 | } | |
1194 | ||
875d95ec MS |
1195 | static struct file_system_type fuse_fs_type = { |
1196 | .owner = THIS_MODULE, | |
1197 | .name = "fuse", | |
79c0b2df | 1198 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1199 | .mount = fuse_mount, |
3b463ae0 | 1200 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1201 | }; |
7f78e035 | 1202 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1203 | |
1204 | #ifdef CONFIG_BLOCK | |
152a0836 | 1205 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1206 | int flags, const char *dev_name, |
152a0836 | 1207 | void *raw_data) |
d6392f87 | 1208 | { |
152a0836 | 1209 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1210 | } |
1211 | ||
3b463ae0 JM |
1212 | static void fuse_kill_sb_blk(struct super_block *sb) |
1213 | { | |
1214 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1215 | ||
1216 | if (fc) { | |
1217 | down_write(&fc->killsb); | |
1218 | fc->sb = NULL; | |
1219 | up_write(&fc->killsb); | |
1220 | } | |
1221 | ||
1222 | kill_block_super(sb); | |
1223 | } | |
1224 | ||
d6392f87 MS |
1225 | static struct file_system_type fuseblk_fs_type = { |
1226 | .owner = THIS_MODULE, | |
1227 | .name = "fuseblk", | |
152a0836 | 1228 | .mount = fuse_mount_blk, |
3b463ae0 | 1229 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1230 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1231 | }; |
7f78e035 | 1232 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1233 | |
875d95ec MS |
1234 | static inline int register_fuseblk(void) |
1235 | { | |
1236 | return register_filesystem(&fuseblk_fs_type); | |
1237 | } | |
1238 | ||
1239 | static inline void unregister_fuseblk(void) | |
1240 | { | |
1241 | unregister_filesystem(&fuseblk_fs_type); | |
1242 | } | |
1243 | #else | |
1244 | static inline int register_fuseblk(void) | |
1245 | { | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | static inline void unregister_fuseblk(void) | |
1250 | { | |
1251 | } | |
1252 | #endif | |
1253 | ||
51cc5068 | 1254 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1255 | { |
1729a16c | 1256 | struct inode *inode = foo; |
d8a5ba45 | 1257 | |
a35afb83 | 1258 | inode_init_once(inode); |
d8a5ba45 MS |
1259 | } |
1260 | ||
1261 | static int __init fuse_fs_init(void) | |
1262 | { | |
1263 | int err; | |
1264 | ||
d6392f87 | 1265 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
5d097056 VD |
1266 | sizeof(struct fuse_inode), 0, |
1267 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, | |
20c2df83 | 1268 | fuse_inode_init_once); |
d6392f87 MS |
1269 | err = -ENOMEM; |
1270 | if (!fuse_inode_cachep) | |
988f0325 AV |
1271 | goto out; |
1272 | ||
1273 | err = register_fuseblk(); | |
1274 | if (err) | |
1275 | goto out2; | |
1276 | ||
1277 | err = register_filesystem(&fuse_fs_type); | |
1278 | if (err) | |
1279 | goto out3; | |
d6392f87 MS |
1280 | |
1281 | return 0; | |
d8a5ba45 | 1282 | |
988f0325 | 1283 | out3: |
875d95ec | 1284 | unregister_fuseblk(); |
988f0325 AV |
1285 | out2: |
1286 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1287 | out: |
d8a5ba45 MS |
1288 | return err; |
1289 | } | |
1290 | ||
1291 | static void fuse_fs_cleanup(void) | |
1292 | { | |
1293 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1294 | unregister_fuseblk(); |
8c0a8537 KS |
1295 | |
1296 | /* | |
1297 | * Make sure all delayed rcu free inodes are flushed before we | |
1298 | * destroy cache. | |
1299 | */ | |
1300 | rcu_barrier(); | |
d8a5ba45 MS |
1301 | kmem_cache_destroy(fuse_inode_cachep); |
1302 | } | |
1303 | ||
5c89e17e | 1304 | static struct kobject *fuse_kobj; |
5c89e17e | 1305 | |
f543f253 MS |
1306 | static int fuse_sysfs_init(void) |
1307 | { | |
1308 | int err; | |
1309 | ||
00d26666 | 1310 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1311 | if (!fuse_kobj) { |
1312 | err = -ENOMEM; | |
f543f253 | 1313 | goto out_err; |
5c89e17e | 1314 | } |
f543f253 | 1315 | |
f9bb4882 EB |
1316 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1317 | if (err) | |
f543f253 MS |
1318 | goto out_fuse_unregister; |
1319 | ||
1320 | return 0; | |
1321 | ||
1322 | out_fuse_unregister: | |
197b12d6 | 1323 | kobject_put(fuse_kobj); |
f543f253 MS |
1324 | out_err: |
1325 | return err; | |
1326 | } | |
1327 | ||
1328 | static void fuse_sysfs_cleanup(void) | |
1329 | { | |
f9bb4882 | 1330 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1331 | kobject_put(fuse_kobj); |
f543f253 MS |
1332 | } |
1333 | ||
d8a5ba45 MS |
1334 | static int __init fuse_init(void) |
1335 | { | |
1336 | int res; | |
1337 | ||
1729a16c | 1338 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1339 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1340 | ||
bafa9654 | 1341 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1342 | res = fuse_fs_init(); |
1343 | if (res) | |
1344 | goto err; | |
1345 | ||
334f485d MS |
1346 | res = fuse_dev_init(); |
1347 | if (res) | |
1348 | goto err_fs_cleanup; | |
1349 | ||
f543f253 MS |
1350 | res = fuse_sysfs_init(); |
1351 | if (res) | |
1352 | goto err_dev_cleanup; | |
1353 | ||
bafa9654 MS |
1354 | res = fuse_ctl_init(); |
1355 | if (res) | |
1356 | goto err_sysfs_cleanup; | |
1357 | ||
487ea5af CH |
1358 | sanitize_global_limit(&max_user_bgreq); |
1359 | sanitize_global_limit(&max_user_congthresh); | |
1360 | ||
d8a5ba45 MS |
1361 | return 0; |
1362 | ||
bafa9654 MS |
1363 | err_sysfs_cleanup: |
1364 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1365 | err_dev_cleanup: |
1366 | fuse_dev_cleanup(); | |
334f485d MS |
1367 | err_fs_cleanup: |
1368 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1369 | err: |
1370 | return res; | |
1371 | } | |
1372 | ||
1373 | static void __exit fuse_exit(void) | |
1374 | { | |
1375 | printk(KERN_DEBUG "fuse exit\n"); | |
1376 | ||
bafa9654 | 1377 | fuse_ctl_cleanup(); |
f543f253 | 1378 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1379 | fuse_fs_cleanup(); |
334f485d | 1380 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1381 | } |
1382 | ||
1383 | module_init(fuse_init); | |
1384 | module_exit(fuse_exit); |