]>
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> |
0b6e9ea0 | 24 | #include <linux/pid_namespace.h> |
d8a5ba45 MS |
25 | |
26 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
27 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
e18b890b | 30 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
31 | struct list_head fuse_conn_list; |
32 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 33 | |
e4dca7b7 | 34 | static int set_global_limit(const char *val, const struct kernel_param *kp); |
487ea5af | 35 | |
79a9d994 | 36 | unsigned max_user_bgreq; |
487ea5af CH |
37 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
38 | &max_user_bgreq, 0644); | |
39 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
40 | MODULE_PARM_DESC(max_user_bgreq, | |
41 | "Global limit for the maximum number of backgrounded requests an " | |
42 | "unprivileged user can set"); | |
43 | ||
79a9d994 | 44 | unsigned max_user_congthresh; |
487ea5af CH |
45 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
46 | &max_user_congthresh, 0644); | |
47 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
48 | MODULE_PARM_DESC(max_user_congthresh, | |
49 | "Global limit for the maximum congestion threshold an " | |
50 | "unprivileged user can set"); | |
51 | ||
d8a5ba45 MS |
52 | #define FUSE_SUPER_MAGIC 0x65735546 |
53 | ||
d1875dba MS |
54 | #define FUSE_DEFAULT_BLKSIZE 512 |
55 | ||
7a6d3c8b CH |
56 | /** Maximum number of outstanding background requests */ |
57 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
58 | ||
59 | /** Congestion starts at 75% of maximum */ | |
60 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
61 | ||
d8a5ba45 MS |
62 | struct fuse_mount_data { |
63 | int fd; | |
64 | unsigned rootmode; | |
499dcf20 EB |
65 | kuid_t user_id; |
66 | kgid_t group_id; | |
1729a16c MS |
67 | unsigned fd_present:1; |
68 | unsigned rootmode_present:1; | |
69 | unsigned user_id_present:1; | |
70 | unsigned group_id_present:1; | |
29433a29 MS |
71 | unsigned default_permissions:1; |
72 | unsigned allow_other:1; | |
db50b96c | 73 | unsigned max_read; |
d8091614 | 74 | unsigned blksize; |
d8a5ba45 MS |
75 | }; |
76 | ||
a2daff68 | 77 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
78 | { |
79 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
80 | } | |
81 | ||
d8a5ba45 MS |
82 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
83 | { | |
84 | struct inode *inode; | |
85 | struct fuse_inode *fi; | |
86 | ||
e94b1766 | 87 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
88 | if (!inode) |
89 | return NULL; | |
90 | ||
91 | fi = get_fuse_inode(inode); | |
0a0898cf | 92 | fi->i_time = 0; |
d8a5ba45 | 93 | fi->nodeid = 0; |
9e6268db | 94 | fi->nlookup = 0; |
fbee36b9 | 95 | fi->attr_version = 0; |
3be5a52b | 96 | fi->writectr = 0; |
45c72cd7 | 97 | fi->orig_ino = 0; |
4582a4ab | 98 | fi->state = 0; |
93a8c3cd | 99 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
100 | INIT_LIST_HEAD(&fi->queued_writes); |
101 | INIT_LIST_HEAD(&fi->writepages); | |
102 | init_waitqueue_head(&fi->page_waitq); | |
5c672ab3 | 103 | mutex_init(&fi->mutex); |
07e77dca MS |
104 | fi->forget = fuse_alloc_forget(); |
105 | if (!fi->forget) { | |
e5e5558e MS |
106 | kmem_cache_free(fuse_inode_cachep, inode); |
107 | return NULL; | |
108 | } | |
d8a5ba45 MS |
109 | |
110 | return inode; | |
111 | } | |
112 | ||
fa0d7e3d NP |
113 | static void fuse_i_callback(struct rcu_head *head) |
114 | { | |
115 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
116 | kmem_cache_free(fuse_inode_cachep, inode); |
117 | } | |
118 | ||
d8a5ba45 MS |
119 | static void fuse_destroy_inode(struct inode *inode) |
120 | { | |
e5e5558e | 121 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 122 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 123 | BUG_ON(!list_empty(&fi->queued_writes)); |
5c672ab3 | 124 | mutex_destroy(&fi->mutex); |
07e77dca | 125 | kfree(fi->forget); |
fa0d7e3d | 126 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
127 | } |
128 | ||
b57922d9 | 129 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 130 | { |
91b0abe3 | 131 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 132 | clear_inode(inode); |
1751e8a6 | 133 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 134 | struct fuse_conn *fc = get_fuse_conn(inode); |
e5e5558e | 135 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
136 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
137 | fi->forget = NULL; | |
e5e5558e | 138 | } |
d8a5ba45 MS |
139 | } |
140 | ||
71421259 MS |
141 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
142 | { | |
02b9984d | 143 | sync_filesystem(sb); |
1751e8a6 | 144 | if (*flags & SB_MANDLOCK) |
71421259 MS |
145 | return -EINVAL; |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
45c72cd7 PS |
150 | /* |
151 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
152 | * so that it will fit. | |
153 | */ | |
154 | static ino_t fuse_squash_ino(u64 ino64) | |
155 | { | |
156 | ino_t ino = (ino_t) ino64; | |
157 | if (sizeof(ino_t) < sizeof(u64)) | |
158 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
159 | return ino; | |
160 | } | |
161 | ||
3be5a52b MS |
162 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
163 | u64 attr_valid) | |
d8a5ba45 | 164 | { |
9ffbb916 | 165 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 166 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 167 | |
1fb69e78 MS |
168 | fi->attr_version = ++fc->attr_version; |
169 | fi->i_time = attr_valid; | |
170 | ||
45c72cd7 | 171 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 172 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 173 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
174 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
175 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
176 | inode->i_blocks = attr->blocks; |
177 | inode->i_atime.tv_sec = attr->atime; | |
178 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
179 | /* mtime from server may be stale due to local buffered write */ |
180 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
181 | inode->i_mtime.tv_sec = attr->mtime; | |
182 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
183 | inode->i_ctime.tv_sec = attr->ctime; |
184 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 185 | } |
e00d2c2d | 186 | |
0e9663ee MS |
187 | if (attr->blksize != 0) |
188 | inode->i_blkbits = ilog2(attr->blksize); | |
189 | else | |
190 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
191 | ||
ebc14c4d MS |
192 | /* |
193 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
194 | * to check permissions. This prevents failures due to the | |
195 | * check in may_delete(). | |
196 | */ | |
197 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 198 | if (!fc->default_permissions) |
ebc14c4d | 199 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
200 | |
201 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
202 | } |
203 | ||
204 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
205 | u64 attr_valid, u64 attr_version) | |
206 | { | |
207 | struct fuse_conn *fc = get_fuse_conn(inode); | |
208 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 209 | bool is_wb = fc->writeback_cache; |
3be5a52b | 210 | loff_t oldsize; |
eed2179e | 211 | struct timespec old_mtime; |
3be5a52b MS |
212 | |
213 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
214 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
215 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
216 | spin_unlock(&fc->lock); |
217 | return; | |
218 | } | |
219 | ||
eed2179e | 220 | old_mtime = inode->i_mtime; |
3be5a52b | 221 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 222 | |
e00d2c2d | 223 | oldsize = inode->i_size; |
8373200b PE |
224 | /* |
225 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
226 | * extend local i_size without keeping userspace server in sync. So, | |
227 | * attr->size coming from server can be stale. We cannot trust it. | |
228 | */ | |
229 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
230 | i_size_write(inode, attr->size); | |
e00d2c2d MS |
231 | spin_unlock(&fc->lock); |
232 | ||
8373200b | 233 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
234 | bool inval = false; |
235 | ||
236 | if (oldsize != attr->size) { | |
7caef267 | 237 | truncate_pagecache(inode, attr->size); |
eed2179e BF |
238 | inval = true; |
239 | } else if (fc->auto_inval_data) { | |
240 | struct timespec new_mtime = { | |
241 | .tv_sec = attr->mtime, | |
242 | .tv_nsec = attr->mtimensec, | |
243 | }; | |
244 | ||
245 | /* | |
246 | * Auto inval mode also checks and invalidates if mtime | |
247 | * has changed. | |
248 | */ | |
249 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
250 | inval = true; | |
251 | } | |
252 | ||
253 | if (inval) | |
254 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 255 | } |
d8a5ba45 MS |
256 | } |
257 | ||
258 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
259 | { | |
260 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 261 | inode->i_size = attr->size; |
b0aa7606 MP |
262 | inode->i_mtime.tv_sec = attr->mtime; |
263 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
264 | inode->i_ctime.tv_sec = attr->ctime; |
265 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
266 | if (S_ISREG(inode->i_mode)) { |
267 | fuse_init_common(inode); | |
b6aeaded | 268 | fuse_init_file_inode(inode); |
e5e5558e MS |
269 | } else if (S_ISDIR(inode->i_mode)) |
270 | fuse_init_dir(inode); | |
271 | else if (S_ISLNK(inode->i_mode)) | |
272 | fuse_init_symlink(inode); | |
273 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
274 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
275 | fuse_init_common(inode); | |
276 | init_special_inode(inode, inode->i_mode, | |
277 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
278 | } else |
279 | BUG(); | |
d8a5ba45 MS |
280 | } |
281 | ||
3b463ae0 | 282 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 283 | { |
b48badf0 | 284 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
285 | if (get_node_id(inode) == nodeid) |
286 | return 1; | |
287 | else | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
292 | { | |
b48badf0 | 293 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
294 | get_fuse_inode(inode)->nodeid = nodeid; |
295 | return 0; | |
296 | } | |
297 | ||
b48badf0 | 298 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
299 | int generation, struct fuse_attr *attr, |
300 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
301 | { |
302 | struct inode *inode; | |
9e6268db | 303 | struct fuse_inode *fi; |
d8a5ba45 | 304 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
305 | |
306 | retry: | |
307 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
308 | if (!inode) | |
309 | return NULL; | |
310 | ||
311 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 312 | inode->i_flags |= S_NOATIME; |
d31433c8 | 313 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 314 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 315 | inode->i_generation = generation; |
d8a5ba45 MS |
316 | fuse_init_inode(inode, attr); |
317 | unlock_new_inode(inode); | |
318 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
319 | /* Inode has changed type, any I/O on the old should fail */ |
320 | make_bad_inode(inode); | |
321 | iput(inode); | |
d8a5ba45 MS |
322 | goto retry; |
323 | } | |
324 | ||
9e6268db | 325 | fi = get_fuse_inode(inode); |
8da5ff23 | 326 | spin_lock(&fc->lock); |
1729a16c | 327 | fi->nlookup++; |
8da5ff23 | 328 | spin_unlock(&fc->lock); |
1fb69e78 MS |
329 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
330 | ||
d8a5ba45 MS |
331 | return inode; |
332 | } | |
333 | ||
3b463ae0 JM |
334 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
335 | loff_t offset, loff_t len) | |
336 | { | |
337 | struct inode *inode; | |
338 | pgoff_t pg_start; | |
339 | pgoff_t pg_end; | |
340 | ||
341 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
342 | if (!inode) | |
343 | return -ENOENT; | |
344 | ||
345 | fuse_invalidate_attr(inode); | |
60bcc88a | 346 | forget_all_cached_acls(inode); |
3b463ae0 | 347 | if (offset >= 0) { |
09cbfeaf | 348 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
349 | if (len <= 0) |
350 | pg_end = -1; | |
351 | else | |
09cbfeaf | 352 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
353 | invalidate_inode_pages2_range(inode->i_mapping, |
354 | pg_start, pg_end); | |
355 | } | |
356 | iput(inode); | |
357 | return 0; | |
358 | } | |
359 | ||
5c672ab3 MS |
360 | void fuse_lock_inode(struct inode *inode) |
361 | { | |
362 | if (!get_fuse_conn(inode)->parallel_dirops) | |
363 | mutex_lock(&get_fuse_inode(inode)->mutex); | |
364 | } | |
365 | ||
366 | void fuse_unlock_inode(struct inode *inode) | |
367 | { | |
368 | if (!get_fuse_conn(inode)->parallel_dirops) | |
369 | mutex_unlock(&get_fuse_inode(inode)->mutex); | |
370 | } | |
371 | ||
42faad99 | 372 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 373 | { |
3b7008b2 | 374 | fuse_abort_conn(get_fuse_conn_super(sb), false); |
69a53bf2 MS |
375 | } |
376 | ||
0ec7ca41 MS |
377 | static void fuse_send_destroy(struct fuse_conn *fc) |
378 | { | |
379 | struct fuse_req *req = fc->destroy_req; | |
380 | if (req && fc->conn_init) { | |
381 | fc->destroy_req = NULL; | |
382 | req->in.h.opcode = FUSE_DESTROY; | |
825d6d33 MS |
383 | __set_bit(FR_FORCE, &req->flags); |
384 | __clear_bit(FR_BACKGROUND, &req->flags); | |
b93f858a | 385 | fuse_request_send(fc, req); |
0ec7ca41 MS |
386 | fuse_put_request(fc, req); |
387 | } | |
388 | } | |
389 | ||
a325f9b9 TH |
390 | static void fuse_put_super(struct super_block *sb) |
391 | { | |
392 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
393 | ||
394 | fuse_send_destroy(fc); | |
bbd99797 | 395 | |
3b7008b2 | 396 | fuse_abort_conn(fc, false); |
bbd99797 MS |
397 | mutex_lock(&fuse_mutex); |
398 | list_del(&fc->entry); | |
399 | fuse_ctl_remove_conn(fc); | |
400 | mutex_unlock(&fuse_mutex); | |
bbd99797 | 401 | |
bafa9654 | 402 | fuse_conn_put(fc); |
d8a5ba45 MS |
403 | } |
404 | ||
e5e5558e MS |
405 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
406 | { | |
407 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
408 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 409 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
410 | stbuf->f_blocks = attr->blocks; |
411 | stbuf->f_bfree = attr->bfree; | |
412 | stbuf->f_bavail = attr->bavail; | |
413 | stbuf->f_files = attr->files; | |
414 | stbuf->f_ffree = attr->ffree; | |
415 | stbuf->f_namelen = attr->namelen; | |
416 | /* fsid is left zero */ | |
417 | } | |
418 | ||
726c3342 | 419 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 420 | { |
726c3342 | 421 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 422 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 423 | FUSE_ARGS(args); |
e5e5558e MS |
424 | struct fuse_statfs_out outarg; |
425 | int err; | |
426 | ||
c2132c1b | 427 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
428 | buf->f_type = FUSE_SUPER_MAGIC; |
429 | return 0; | |
430 | } | |
431 | ||
de5f1202 | 432 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
433 | args.in.numargs = 0; |
434 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 435 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 436 | args.out.numargs = 1; |
21f62174 | 437 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
438 | args.out.args[0].value = &outarg; |
439 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
440 | if (!err) |
441 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
442 | return err; |
443 | } | |
444 | ||
d8a5ba45 MS |
445 | enum { |
446 | OPT_FD, | |
447 | OPT_ROOTMODE, | |
448 | OPT_USER_ID, | |
87729a55 | 449 | OPT_GROUP_ID, |
d8a5ba45 MS |
450 | OPT_DEFAULT_PERMISSIONS, |
451 | OPT_ALLOW_OTHER, | |
db50b96c | 452 | OPT_MAX_READ, |
d8091614 | 453 | OPT_BLKSIZE, |
d8a5ba45 MS |
454 | OPT_ERR |
455 | }; | |
456 | ||
a447c093 | 457 | static const match_table_t tokens = { |
d8a5ba45 MS |
458 | {OPT_FD, "fd=%u"}, |
459 | {OPT_ROOTMODE, "rootmode=%o"}, | |
460 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 461 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
462 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
463 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 464 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 465 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
466 | {OPT_ERR, NULL} |
467 | }; | |
468 | ||
233a01fa MS |
469 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
470 | { | |
471 | int err = -ENOMEM; | |
472 | char *buf = match_strdup(s); | |
473 | if (buf) { | |
474 | err = kstrtouint(buf, 10, res); | |
475 | kfree(buf); | |
476 | } | |
477 | return err; | |
478 | } | |
479 | ||
d8091614 | 480 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
481 | { |
482 | char *p; | |
483 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 484 | d->max_read = ~0; |
d1875dba | 485 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
486 | |
487 | while ((p = strsep(&opt, ",")) != NULL) { | |
488 | int token; | |
489 | int value; | |
233a01fa | 490 | unsigned uv; |
d8a5ba45 MS |
491 | substring_t args[MAX_OPT_ARGS]; |
492 | if (!*p) | |
493 | continue; | |
494 | ||
495 | token = match_token(p, tokens, args); | |
496 | switch (token) { | |
497 | case OPT_FD: | |
498 | if (match_int(&args[0], &value)) | |
499 | return 0; | |
500 | d->fd = value; | |
5a533682 | 501 | d->fd_present = 1; |
d8a5ba45 MS |
502 | break; |
503 | ||
504 | case OPT_ROOTMODE: | |
505 | if (match_octal(&args[0], &value)) | |
506 | return 0; | |
a5bfffac TS |
507 | if (!fuse_valid_type(value)) |
508 | return 0; | |
d8a5ba45 | 509 | d->rootmode = value; |
5a533682 | 510 | d->rootmode_present = 1; |
d8a5ba45 MS |
511 | break; |
512 | ||
513 | case OPT_USER_ID: | |
233a01fa | 514 | if (fuse_match_uint(&args[0], &uv)) |
d8a5ba45 | 515 | return 0; |
233a01fa | 516 | d->user_id = make_kuid(current_user_ns(), uv); |
499dcf20 EB |
517 | if (!uid_valid(d->user_id)) |
518 | return 0; | |
5a533682 | 519 | d->user_id_present = 1; |
d8a5ba45 MS |
520 | break; |
521 | ||
87729a55 | 522 | case OPT_GROUP_ID: |
233a01fa | 523 | if (fuse_match_uint(&args[0], &uv)) |
87729a55 | 524 | return 0; |
233a01fa | 525 | d->group_id = make_kgid(current_user_ns(), uv); |
499dcf20 EB |
526 | if (!gid_valid(d->group_id)) |
527 | return 0; | |
5a533682 | 528 | d->group_id_present = 1; |
87729a55 MS |
529 | break; |
530 | ||
1e9a4ed9 | 531 | case OPT_DEFAULT_PERMISSIONS: |
29433a29 | 532 | d->default_permissions = 1; |
1e9a4ed9 MS |
533 | break; |
534 | ||
535 | case OPT_ALLOW_OTHER: | |
29433a29 | 536 | d->allow_other = 1; |
1e9a4ed9 MS |
537 | break; |
538 | ||
db50b96c MS |
539 | case OPT_MAX_READ: |
540 | if (match_int(&args[0], &value)) | |
541 | return 0; | |
542 | d->max_read = value; | |
543 | break; | |
544 | ||
d8091614 MS |
545 | case OPT_BLKSIZE: |
546 | if (!is_bdev || match_int(&args[0], &value)) | |
547 | return 0; | |
548 | d->blksize = value; | |
549 | break; | |
550 | ||
d8a5ba45 MS |
551 | default: |
552 | return 0; | |
553 | } | |
554 | } | |
5a533682 MS |
555 | |
556 | if (!d->fd_present || !d->rootmode_present || | |
557 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
558 | return 0; |
559 | ||
560 | return 1; | |
561 | } | |
562 | ||
34c80b1d | 563 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 564 | { |
34c80b1d AV |
565 | struct super_block *sb = root->d_sb; |
566 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 567 | |
499dcf20 EB |
568 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
569 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
29433a29 | 570 | if (fc->default_permissions) |
1e9a4ed9 | 571 | seq_puts(m, ",default_permissions"); |
29433a29 | 572 | if (fc->allow_other) |
1e9a4ed9 | 573 | seq_puts(m, ",allow_other"); |
db50b96c MS |
574 | if (fc->max_read != ~0) |
575 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
576 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
577 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
578 | return 0; |
579 | } | |
580 | ||
f88996a9 MS |
581 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
582 | { | |
583 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
584 | init_waitqueue_head(&fiq->waitq); | |
585 | INIT_LIST_HEAD(&fiq->pending); | |
586 | INIT_LIST_HEAD(&fiq->interrupts); | |
587 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 588 | fiq->connected = 1; |
f88996a9 MS |
589 | } |
590 | ||
3a2b5b9c MS |
591 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
592 | { | |
593 | memset(fpq, 0, sizeof(struct fuse_pqueue)); | |
45a91cb1 | 594 | spin_lock_init(&fpq->lock); |
3a2b5b9c MS |
595 | INIT_LIST_HEAD(&fpq->processing); |
596 | INIT_LIST_HEAD(&fpq->io); | |
e96edd94 | 597 | fpq->connected = 1; |
3a2b5b9c MS |
598 | } |
599 | ||
a325f9b9 | 600 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 601 | { |
0d179aa5 TH |
602 | memset(fc, 0, sizeof(*fc)); |
603 | spin_lock_init(&fc->lock); | |
3b463ae0 | 604 | init_rwsem(&fc->killsb); |
095fc40a | 605 | refcount_set(&fc->count, 1); |
c3696046 | 606 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
607 | init_waitqueue_head(&fc->blocked_waitq); |
608 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 609 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
610 | INIT_LIST_HEAD(&fc->bg_queue); |
611 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 612 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 613 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
614 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
615 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
616 | fc->khctr = 0; |
617 | fc->polled_files = RB_ROOT; | |
0aada884 | 618 | fc->blocked = 0; |
796523fb | 619 | fc->initialized = 0; |
e16714d8 | 620 | fc->connected = 1; |
0d179aa5 TH |
621 | fc->attr_version = 1; |
622 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
0b6e9ea0 | 623 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
d8a5ba45 | 624 | } |
0d179aa5 | 625 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 626 | |
bafa9654 MS |
627 | void fuse_conn_put(struct fuse_conn *fc) |
628 | { | |
095fc40a | 629 | if (refcount_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
630 | if (fc->destroy_req) |
631 | fuse_request_free(fc->destroy_req); | |
0b6e9ea0 | 632 | put_pid_ns(fc->pid_ns); |
43901aab | 633 | fc->release(fc); |
d2a85164 | 634 | } |
bafa9654 | 635 | } |
08cbf542 | 636 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
637 | |
638 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
639 | { | |
095fc40a | 640 | refcount_inc(&fc->count); |
bafa9654 MS |
641 | return fc; |
642 | } | |
08cbf542 | 643 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 644 | |
b93f858a | 645 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
646 | { |
647 | struct fuse_attr attr; | |
648 | memset(&attr, 0, sizeof(attr)); | |
649 | ||
650 | attr.mode = mode; | |
651 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 652 | attr.nlink = 1; |
1fb69e78 | 653 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
654 | } |
655 | ||
1729a16c | 656 | struct fuse_inode_handle { |
dbd561d2 MS |
657 | u64 nodeid; |
658 | u32 generation; | |
659 | }; | |
660 | ||
661 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
662 | struct fuse_inode_handle *handle) | |
663 | { | |
33670fa2 | 664 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
665 | struct inode *inode; |
666 | struct dentry *entry; | |
667 | int err = -ESTALE; | |
668 | ||
669 | if (handle->nodeid == 0) | |
670 | goto out_err; | |
671 | ||
672 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
673 | if (!inode) { |
674 | struct fuse_entry_out outarg; | |
13983d06 | 675 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
676 | |
677 | if (!fc->export_support) | |
678 | goto out_err; | |
679 | ||
33670fa2 MS |
680 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
681 | &inode); | |
682 | if (err && err != -ENOENT) | |
683 | goto out_err; | |
684 | if (err || !inode) { | |
685 | err = -ESTALE; | |
686 | goto out_err; | |
687 | } | |
688 | err = -EIO; | |
689 | if (get_node_id(inode) != handle->nodeid) | |
690 | goto out_iput; | |
691 | } | |
dbd561d2 MS |
692 | err = -ESTALE; |
693 | if (inode->i_generation != handle->generation) | |
694 | goto out_iput; | |
695 | ||
44003728 | 696 | entry = d_obtain_alias(inode); |
c35eebe9 | 697 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 698 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
699 | |
700 | return entry; | |
701 | ||
702 | out_iput: | |
703 | iput(inode); | |
704 | out_err: | |
705 | return ERR_PTR(err); | |
706 | } | |
707 | ||
b0b0382b AV |
708 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
709 | struct inode *parent) | |
dbd561d2 | 710 | { |
b0b0382b | 711 | int len = parent ? 6 : 3; |
dbd561d2 MS |
712 | u64 nodeid; |
713 | u32 generation; | |
714 | ||
5fe0c237 AK |
715 | if (*max_len < len) { |
716 | *max_len = len; | |
94e07a75 | 717 | return FILEID_INVALID; |
5fe0c237 | 718 | } |
dbd561d2 MS |
719 | |
720 | nodeid = get_fuse_inode(inode)->nodeid; | |
721 | generation = inode->i_generation; | |
722 | ||
723 | fh[0] = (u32)(nodeid >> 32); | |
724 | fh[1] = (u32)(nodeid & 0xffffffff); | |
725 | fh[2] = generation; | |
726 | ||
b0b0382b | 727 | if (parent) { |
dbd561d2 MS |
728 | nodeid = get_fuse_inode(parent)->nodeid; |
729 | generation = parent->i_generation; | |
dbd561d2 MS |
730 | |
731 | fh[3] = (u32)(nodeid >> 32); | |
732 | fh[4] = (u32)(nodeid & 0xffffffff); | |
733 | fh[5] = generation; | |
734 | } | |
735 | ||
736 | *max_len = len; | |
b0b0382b | 737 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
738 | } |
739 | ||
740 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
741 | struct fid *fid, int fh_len, int fh_type) | |
742 | { | |
743 | struct fuse_inode_handle handle; | |
744 | ||
745 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
746 | return NULL; | |
747 | ||
748 | handle.nodeid = (u64) fid->raw[0] << 32; | |
749 | handle.nodeid |= (u64) fid->raw[1]; | |
750 | handle.generation = fid->raw[2]; | |
751 | return fuse_get_dentry(sb, &handle); | |
752 | } | |
753 | ||
754 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
755 | struct fid *fid, int fh_len, int fh_type) | |
756 | { | |
757 | struct fuse_inode_handle parent; | |
758 | ||
759 | if (fh_type != 0x82 || fh_len < 6) | |
760 | return NULL; | |
761 | ||
762 | parent.nodeid = (u64) fid->raw[3] << 32; | |
763 | parent.nodeid |= (u64) fid->raw[4]; | |
764 | parent.generation = fid->raw[5]; | |
765 | return fuse_get_dentry(sb, &parent); | |
766 | } | |
767 | ||
33670fa2 MS |
768 | static struct dentry *fuse_get_parent(struct dentry *child) |
769 | { | |
2b0143b5 | 770 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
771 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
772 | struct inode *inode; | |
773 | struct dentry *parent; | |
774 | struct fuse_entry_out outarg; | |
13983d06 | 775 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
776 | int err; |
777 | ||
778 | if (!fc->export_support) | |
779 | return ERR_PTR(-ESTALE); | |
780 | ||
33670fa2 MS |
781 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
782 | &name, &outarg, &inode); | |
44003728 CH |
783 | if (err) { |
784 | if (err == -ENOENT) | |
785 | return ERR_PTR(-ESTALE); | |
33670fa2 | 786 | return ERR_PTR(err); |
33670fa2 | 787 | } |
44003728 CH |
788 | |
789 | parent = d_obtain_alias(inode); | |
c35eebe9 | 790 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 791 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
792 | |
793 | return parent; | |
794 | } | |
dbd561d2 MS |
795 | |
796 | static const struct export_operations fuse_export_operations = { | |
797 | .fh_to_dentry = fuse_fh_to_dentry, | |
798 | .fh_to_parent = fuse_fh_to_parent, | |
799 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 800 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
801 | }; |
802 | ||
ee9b6d61 | 803 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
804 | .alloc_inode = fuse_alloc_inode, |
805 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 806 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 807 | .write_inode = fuse_write_inode, |
ead5f0b5 | 808 | .drop_inode = generic_delete_inode, |
71421259 | 809 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 810 | .put_super = fuse_put_super, |
69a53bf2 | 811 | .umount_begin = fuse_umount_begin, |
e5e5558e | 812 | .statfs = fuse_statfs, |
d8a5ba45 MS |
813 | .show_options = fuse_show_options, |
814 | }; | |
815 | ||
487ea5af CH |
816 | static void sanitize_global_limit(unsigned *limit) |
817 | { | |
818 | if (*limit == 0) | |
0ed5fd13 | 819 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
820 | sizeof(struct fuse_req); |
821 | ||
822 | if (*limit >= 1 << 16) | |
823 | *limit = (1 << 16) - 1; | |
824 | } | |
825 | ||
e4dca7b7 | 826 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
827 | { |
828 | int rv; | |
829 | ||
830 | rv = param_set_uint(val, kp); | |
831 | if (rv) | |
832 | return rv; | |
833 | ||
834 | sanitize_global_limit((unsigned *)kp->arg); | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
840 | { | |
841 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
842 | ||
843 | if (arg->minor < 13) | |
844 | return; | |
845 | ||
846 | sanitize_global_limit(&max_user_bgreq); | |
847 | sanitize_global_limit(&max_user_congthresh); | |
848 | ||
849 | if (arg->max_background) { | |
850 | fc->max_background = arg->max_background; | |
851 | ||
852 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
853 | fc->max_background = max_user_bgreq; | |
854 | } | |
855 | if (arg->congestion_threshold) { | |
856 | fc->congestion_threshold = arg->congestion_threshold; | |
857 | ||
858 | if (!cap_sys_admin && | |
859 | fc->congestion_threshold > max_user_congthresh) | |
860 | fc->congestion_threshold = max_user_congthresh; | |
861 | } | |
862 | } | |
863 | ||
9b9a0469 MS |
864 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
865 | { | |
9b9a0469 MS |
866 | struct fuse_init_out *arg = &req->misc.init_out; |
867 | ||
868 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
869 | fc->conn_error = 1; | |
870 | else { | |
9cd68455 MS |
871 | unsigned long ra_pages; |
872 | ||
487ea5af CH |
873 | process_init_limits(fc, arg); |
874 | ||
9cd68455 | 875 | if (arg->minor >= 6) { |
09cbfeaf | 876 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
877 | if (arg->flags & FUSE_ASYNC_READ) |
878 | fc->async_read = 1; | |
71421259 MS |
879 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
880 | fc->no_lock = 1; | |
37fb3a30 MS |
881 | if (arg->minor >= 17) { |
882 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
883 | fc->no_flock = 1; | |
24114504 MS |
884 | } else { |
885 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
886 | fc->no_flock = 1; | |
37fb3a30 | 887 | } |
6ff958ed MS |
888 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
889 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
890 | if (arg->minor >= 9) { |
891 | /* LOOKUP has dependency on proto version */ | |
892 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
893 | fc->export_support = 1; | |
894 | } | |
78bb6cb9 MS |
895 | if (arg->flags & FUSE_BIG_WRITES) |
896 | fc->big_writes = 1; | |
e0a43ddc MS |
897 | if (arg->flags & FUSE_DONT_MASK) |
898 | fc->dont_mask = 1; | |
72d0d248 BF |
899 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
900 | fc->auto_inval_data = 1; | |
28420dad | 901 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 902 | fc->do_readdirplus = 1; |
28420dad MS |
903 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
904 | fc->readdirplus_auto = 1; | |
905 | } | |
60b9df7a MS |
906 | if (arg->flags & FUSE_ASYNC_DIO) |
907 | fc->async_dio = 1; | |
4d99ff8f PE |
908 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
909 | fc->writeback_cache = 1; | |
5c672ab3 MS |
910 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
911 | fc->parallel_dirops = 1; | |
5e940c1d MS |
912 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
913 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
914 | if (arg->time_gran && arg->time_gran <= 1000000000) |
915 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 916 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 917 | fc->default_permissions = 1; |
60bcc88a SF |
918 | fc->posix_acl = 1; |
919 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
920 | } | |
3b7008b2 SL |
921 | if (arg->flags & FUSE_ABORT_ERROR) |
922 | fc->abort_err = 1; | |
71421259 | 923 | } else { |
09cbfeaf | 924 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 925 | fc->no_lock = 1; |
37fb3a30 | 926 | fc->no_flock = 1; |
71421259 | 927 | } |
9cd68455 | 928 | |
5f7f7543 JK |
929 | fc->sb->s_bdi->ra_pages = |
930 | min(fc->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
931 | fc->minor = arg->minor; |
932 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 933 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 934 | fc->conn_init = 1; |
9b9a0469 | 935 | } |
9759bd51 | 936 | fuse_set_initialized(fc); |
08a53cdc | 937 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
938 | } |
939 | ||
ce1d5a49 | 940 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 941 | { |
9b9a0469 | 942 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 943 | |
9b9a0469 MS |
944 | arg->major = FUSE_KERNEL_VERSION; |
945 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
5f7f7543 | 946 | arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; |
78bb6cb9 | 947 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 948 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 949 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 950 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 951 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 952 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 SL |
953 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
954 | FUSE_ABORT_ERROR; | |
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; | |
5f7f7543 | 979 | char *suffix = ""; |
a325f9b9 | 980 | |
69c8ebf8 | 981 | if (sb->s_bdev) { |
5f7f7543 | 982 | suffix = "-fuseblk"; |
69c8ebf8 JK |
983 | /* |
984 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
985 | * it to our private bdi... | |
986 | */ | |
987 | bdi_put(sb->s_bdi); | |
988 | sb->s_bdi = &noop_backing_dev_info; | |
989 | } | |
5f7f7543 JK |
990 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
991 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
992 | if (err) |
993 | return err; | |
994 | ||
5f7f7543 JK |
995 | sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
996 | /* fuse does it's own writeback accounting */ | |
997 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 998 | |
a325f9b9 TH |
999 | /* |
1000 | * For a single fuse filesystem use max 1% of dirty + | |
1001 | * writeback threshold. | |
1002 | * | |
1003 | * This gives about 1M of write buffer for memory maps on a | |
1004 | * machine with 1G and 10% dirty_ratio, which should be more | |
1005 | * than enough. | |
1006 | * | |
1007 | * Privileged users can raise it by writing to | |
1008 | * | |
1009 | * /sys/class/bdi/<bdi>/max_ratio | |
1010 | */ | |
5f7f7543 | 1011 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1012 | |
1013 | return 0; | |
1014 | } | |
1015 | ||
cc080e9e MS |
1016 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1017 | { | |
1018 | struct fuse_dev *fud; | |
1019 | ||
1020 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
1021 | if (fud) { | |
1022 | fud->fc = fuse_conn_get(fc); | |
c3696046 | 1023 | fuse_pqueue_init(&fud->pq); |
cc080e9e MS |
1024 | |
1025 | spin_lock(&fc->lock); | |
1026 | list_add_tail(&fud->entry, &fc->devices); | |
1027 | spin_unlock(&fc->lock); | |
1028 | } | |
1029 | ||
1030 | return fud; | |
1031 | } | |
1032 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1033 | ||
1034 | void fuse_dev_free(struct fuse_dev *fud) | |
1035 | { | |
1036 | struct fuse_conn *fc = fud->fc; | |
1037 | ||
1038 | if (fc) { | |
1039 | spin_lock(&fc->lock); | |
1040 | list_del(&fud->entry); | |
1041 | spin_unlock(&fc->lock); | |
1042 | ||
1043 | fuse_conn_put(fc); | |
1044 | } | |
1045 | kfree(fud); | |
1046 | } | |
1047 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1048 | ||
d8a5ba45 MS |
1049 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
1050 | { | |
cc080e9e | 1051 | struct fuse_dev *fud; |
d8a5ba45 MS |
1052 | struct fuse_conn *fc; |
1053 | struct inode *root; | |
1054 | struct fuse_mount_data d; | |
1055 | struct file *file; | |
f543f253 | 1056 | struct dentry *root_dentry; |
ce1d5a49 | 1057 | struct fuse_req *init_req; |
d8a5ba45 | 1058 | int err; |
d8091614 | 1059 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1060 | |
c2b8f006 | 1061 | err = -EINVAL; |
1751e8a6 | 1062 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1063 | goto err; |
71421259 | 1064 | |
1751e8a6 | 1065 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); |
9e1f1de0 | 1066 | |
7b3d8bf7 | 1067 | if (!parse_fuse_opt(data, &d, is_bdev)) |
c2b8f006 | 1068 | goto err; |
d8a5ba45 | 1069 | |
d8091614 | 1070 | if (is_bdev) { |
875d95ec | 1071 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1072 | err = -EINVAL; |
d8091614 | 1073 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1074 | goto err; |
875d95ec | 1075 | #endif |
d8091614 | 1076 | } else { |
09cbfeaf KS |
1077 | sb->s_blocksize = PAGE_SIZE; |
1078 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1079 | } |
d8a5ba45 MS |
1080 | sb->s_magic = FUSE_SUPER_MAGIC; |
1081 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1082 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1083 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1084 | sb->s_time_gran = 1; |
dbd561d2 | 1085 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1086 | |
1087 | file = fget(d.fd); | |
c2b8f006 | 1088 | err = -EINVAL; |
d8a5ba45 | 1089 | if (!file) |
c2b8f006 | 1090 | goto err; |
d8a5ba45 | 1091 | |
499dcf20 EB |
1092 | if ((file->f_op != &fuse_dev_operations) || |
1093 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1094 | goto err_fput; |
0720b315 | 1095 | |
0d179aa5 | 1096 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1097 | err = -ENOMEM; |
1098 | if (!fc) | |
1099 | goto err_fput; | |
d8a5ba45 | 1100 | |
a325f9b9 | 1101 | fuse_conn_init(fc); |
0ad0b325 | 1102 | fc->release = fuse_free_conn; |
a325f9b9 | 1103 | |
cc080e9e MS |
1104 | fud = fuse_dev_alloc(fc); |
1105 | if (!fud) | |
1106 | goto err_put_conn; | |
1107 | ||
a325f9b9 | 1108 | fc->dev = sb->s_dev; |
3b463ae0 | 1109 | fc->sb = sb; |
a325f9b9 TH |
1110 | err = fuse_bdi_init(fc, sb); |
1111 | if (err) | |
cc080e9e | 1112 | goto err_dev_free; |
0d179aa5 | 1113 | |
e0a43ddc | 1114 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1115 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1116 | fc->dont_mask = 1; |
1751e8a6 | 1117 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1118 | |
29433a29 MS |
1119 | fc->default_permissions = d.default_permissions; |
1120 | fc->allow_other = d.allow_other; | |
d8a5ba45 | 1121 | fc->user_id = d.user_id; |
87729a55 | 1122 | fc->group_id = d.group_id; |
f948d564 | 1123 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1124 | |
f543f253 MS |
1125 | /* Used by get_root_inode() */ |
1126 | sb->s_fs_info = fc; | |
1127 | ||
d8a5ba45 | 1128 | err = -ENOMEM; |
b93f858a | 1129 | root = fuse_get_root_inode(sb, d.rootmode); |
0ce267ff | 1130 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1131 | root_dentry = d_make_root(root); |
1132 | if (!root_dentry) | |
cc080e9e | 1133 | goto err_dev_free; |
0ce267ff | 1134 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1135 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1136 | |
4250c066 | 1137 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1138 | if (!init_req) |
1139 | goto err_put_root; | |
825d6d33 | 1140 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1141 | |
0ec7ca41 | 1142 | if (is_bdev) { |
4250c066 | 1143 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1144 | if (!fc->destroy_req) |
17e18ab6 | 1145 | goto err_free_init_req; |
0ec7ca41 MS |
1146 | } |
1147 | ||
bafa9654 | 1148 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1149 | err = -EINVAL; |
1150 | if (file->private_data) | |
bafa9654 | 1151 | goto err_unlock; |
8aa09a50 | 1152 | |
bafa9654 MS |
1153 | err = fuse_ctl_add_conn(fc); |
1154 | if (err) | |
1155 | goto err_unlock; | |
1156 | ||
1157 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1158 | sb->s_root = root_dentry; |
cc080e9e | 1159 | file->private_data = fud; |
bafa9654 | 1160 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1161 | /* |
1162 | * atomic_dec_and_test() in fput() provides the necessary | |
1163 | * memory barrier for file->private_data to be visible on all | |
1164 | * CPUs after this | |
1165 | */ | |
1166 | fput(file); | |
f543f253 | 1167 | |
ce1d5a49 | 1168 | fuse_send_init(fc, init_req); |
f543f253 | 1169 | |
d8a5ba45 MS |
1170 | return 0; |
1171 | ||
bafa9654 MS |
1172 | err_unlock: |
1173 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1174 | err_free_init_req: |
ce1d5a49 | 1175 | fuse_request_free(init_req); |
f543f253 MS |
1176 | err_put_root: |
1177 | dput(root_dentry); | |
cc080e9e MS |
1178 | err_dev_free: |
1179 | fuse_dev_free(fud); | |
c2b8f006 | 1180 | err_put_conn: |
bafa9654 | 1181 | fuse_conn_put(fc); |
c2b8f006 MS |
1182 | err_fput: |
1183 | fput(file); | |
1184 | err: | |
d8a5ba45 MS |
1185 | return err; |
1186 | } | |
1187 | ||
3c26ff6e | 1188 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1189 | int flags, const char *dev_name, |
3c26ff6e | 1190 | void *raw_data) |
d8a5ba45 | 1191 | { |
3c26ff6e | 1192 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1193 | } |
1194 | ||
3b463ae0 JM |
1195 | static void fuse_kill_sb_anon(struct super_block *sb) |
1196 | { | |
1197 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1198 | ||
1199 | if (fc) { | |
1200 | down_write(&fc->killsb); | |
1201 | fc->sb = NULL; | |
1202 | up_write(&fc->killsb); | |
1203 | } | |
1204 | ||
1205 | kill_anon_super(sb); | |
1206 | } | |
1207 | ||
875d95ec MS |
1208 | static struct file_system_type fuse_fs_type = { |
1209 | .owner = THIS_MODULE, | |
1210 | .name = "fuse", | |
79c0b2df | 1211 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1212 | .mount = fuse_mount, |
3b463ae0 | 1213 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1214 | }; |
7f78e035 | 1215 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1216 | |
1217 | #ifdef CONFIG_BLOCK | |
152a0836 | 1218 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1219 | int flags, const char *dev_name, |
152a0836 | 1220 | void *raw_data) |
d6392f87 | 1221 | { |
152a0836 | 1222 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1223 | } |
1224 | ||
3b463ae0 JM |
1225 | static void fuse_kill_sb_blk(struct super_block *sb) |
1226 | { | |
1227 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1228 | ||
1229 | if (fc) { | |
1230 | down_write(&fc->killsb); | |
1231 | fc->sb = NULL; | |
1232 | up_write(&fc->killsb); | |
1233 | } | |
1234 | ||
1235 | kill_block_super(sb); | |
1236 | } | |
1237 | ||
d6392f87 MS |
1238 | static struct file_system_type fuseblk_fs_type = { |
1239 | .owner = THIS_MODULE, | |
1240 | .name = "fuseblk", | |
152a0836 | 1241 | .mount = fuse_mount_blk, |
3b463ae0 | 1242 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1243 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1244 | }; |
7f78e035 | 1245 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1246 | |
875d95ec MS |
1247 | static inline int register_fuseblk(void) |
1248 | { | |
1249 | return register_filesystem(&fuseblk_fs_type); | |
1250 | } | |
1251 | ||
1252 | static inline void unregister_fuseblk(void) | |
1253 | { | |
1254 | unregister_filesystem(&fuseblk_fs_type); | |
1255 | } | |
1256 | #else | |
1257 | static inline int register_fuseblk(void) | |
1258 | { | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | static inline void unregister_fuseblk(void) | |
1263 | { | |
1264 | } | |
1265 | #endif | |
1266 | ||
51cc5068 | 1267 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1268 | { |
1729a16c | 1269 | struct inode *inode = foo; |
d8a5ba45 | 1270 | |
a35afb83 | 1271 | inode_init_once(inode); |
d8a5ba45 MS |
1272 | } |
1273 | ||
1274 | static int __init fuse_fs_init(void) | |
1275 | { | |
1276 | int err; | |
1277 | ||
d6392f87 | 1278 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1279 | sizeof(struct fuse_inode), 0, |
1280 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1281 | fuse_inode_init_once); | |
d6392f87 MS |
1282 | err = -ENOMEM; |
1283 | if (!fuse_inode_cachep) | |
988f0325 AV |
1284 | goto out; |
1285 | ||
1286 | err = register_fuseblk(); | |
1287 | if (err) | |
1288 | goto out2; | |
1289 | ||
1290 | err = register_filesystem(&fuse_fs_type); | |
1291 | if (err) | |
1292 | goto out3; | |
d6392f87 MS |
1293 | |
1294 | return 0; | |
d8a5ba45 | 1295 | |
988f0325 | 1296 | out3: |
875d95ec | 1297 | unregister_fuseblk(); |
988f0325 AV |
1298 | out2: |
1299 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1300 | out: |
d8a5ba45 MS |
1301 | return err; |
1302 | } | |
1303 | ||
1304 | static void fuse_fs_cleanup(void) | |
1305 | { | |
1306 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1307 | unregister_fuseblk(); |
8c0a8537 KS |
1308 | |
1309 | /* | |
1310 | * Make sure all delayed rcu free inodes are flushed before we | |
1311 | * destroy cache. | |
1312 | */ | |
1313 | rcu_barrier(); | |
d8a5ba45 MS |
1314 | kmem_cache_destroy(fuse_inode_cachep); |
1315 | } | |
1316 | ||
5c89e17e | 1317 | static struct kobject *fuse_kobj; |
5c89e17e | 1318 | |
f543f253 MS |
1319 | static int fuse_sysfs_init(void) |
1320 | { | |
1321 | int err; | |
1322 | ||
00d26666 | 1323 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1324 | if (!fuse_kobj) { |
1325 | err = -ENOMEM; | |
f543f253 | 1326 | goto out_err; |
5c89e17e | 1327 | } |
f543f253 | 1328 | |
f9bb4882 EB |
1329 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1330 | if (err) | |
f543f253 MS |
1331 | goto out_fuse_unregister; |
1332 | ||
1333 | return 0; | |
1334 | ||
1335 | out_fuse_unregister: | |
197b12d6 | 1336 | kobject_put(fuse_kobj); |
f543f253 MS |
1337 | out_err: |
1338 | return err; | |
1339 | } | |
1340 | ||
1341 | static void fuse_sysfs_cleanup(void) | |
1342 | { | |
f9bb4882 | 1343 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1344 | kobject_put(fuse_kobj); |
f543f253 MS |
1345 | } |
1346 | ||
d8a5ba45 MS |
1347 | static int __init fuse_init(void) |
1348 | { | |
1349 | int res; | |
1350 | ||
1729a16c | 1351 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1352 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1353 | ||
bafa9654 | 1354 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1355 | res = fuse_fs_init(); |
1356 | if (res) | |
1357 | goto err; | |
1358 | ||
334f485d MS |
1359 | res = fuse_dev_init(); |
1360 | if (res) | |
1361 | goto err_fs_cleanup; | |
1362 | ||
f543f253 MS |
1363 | res = fuse_sysfs_init(); |
1364 | if (res) | |
1365 | goto err_dev_cleanup; | |
1366 | ||
bafa9654 MS |
1367 | res = fuse_ctl_init(); |
1368 | if (res) | |
1369 | goto err_sysfs_cleanup; | |
1370 | ||
487ea5af CH |
1371 | sanitize_global_limit(&max_user_bgreq); |
1372 | sanitize_global_limit(&max_user_congthresh); | |
1373 | ||
d8a5ba45 MS |
1374 | return 0; |
1375 | ||
bafa9654 MS |
1376 | err_sysfs_cleanup: |
1377 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1378 | err_dev_cleanup: |
1379 | fuse_dev_cleanup(); | |
334f485d MS |
1380 | err_fs_cleanup: |
1381 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1382 | err: |
1383 | return res; | |
1384 | } | |
1385 | ||
1386 | static void __exit fuse_exit(void) | |
1387 | { | |
1388 | printk(KERN_DEBUG "fuse exit\n"); | |
1389 | ||
bafa9654 | 1390 | fuse_ctl_cleanup(); |
f543f253 | 1391 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1392 | fuse_fs_cleanup(); |
334f485d | 1393 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1394 | } |
1395 | ||
1396 | module_init(fuse_init); | |
1397 | module_exit(fuse_exit); |