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Commit | Line | Data |
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d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
d8a5ba45 MS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
487ea5af | 17 | #include <linux/moduleparam.h> |
d8a5ba45 MS |
18 | #include <linux/parser.h> |
19 | #include <linux/statfs.h> | |
9c8ef561 | 20 | #include <linux/random.h> |
e8edc6e0 | 21 | #include <linux/sched.h> |
dbd561d2 | 22 | #include <linux/exportfs.h> |
d8a5ba45 MS |
23 | |
24 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
25 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
e18b890b | 28 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
29 | struct list_head fuse_conn_list; |
30 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 31 | |
487ea5af CH |
32 | static int set_global_limit(const char *val, struct kernel_param *kp); |
33 | ||
79a9d994 | 34 | unsigned max_user_bgreq; |
487ea5af CH |
35 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
36 | &max_user_bgreq, 0644); | |
37 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
38 | MODULE_PARM_DESC(max_user_bgreq, | |
39 | "Global limit for the maximum number of backgrounded requests an " | |
40 | "unprivileged user can set"); | |
41 | ||
79a9d994 | 42 | unsigned max_user_congthresh; |
487ea5af CH |
43 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
44 | &max_user_congthresh, 0644); | |
45 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
46 | MODULE_PARM_DESC(max_user_congthresh, | |
47 | "Global limit for the maximum congestion threshold an " | |
48 | "unprivileged user can set"); | |
49 | ||
d8a5ba45 MS |
50 | #define FUSE_SUPER_MAGIC 0x65735546 |
51 | ||
d1875dba MS |
52 | #define FUSE_DEFAULT_BLKSIZE 512 |
53 | ||
7a6d3c8b CH |
54 | /** Maximum number of outstanding background requests */ |
55 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
56 | ||
57 | /** Congestion starts at 75% of maximum */ | |
58 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
59 | ||
d8a5ba45 MS |
60 | struct fuse_mount_data { |
61 | int fd; | |
62 | unsigned rootmode; | |
499dcf20 EB |
63 | kuid_t user_id; |
64 | kgid_t group_id; | |
1729a16c MS |
65 | unsigned fd_present:1; |
66 | unsigned rootmode_present:1; | |
67 | unsigned user_id_present:1; | |
68 | unsigned group_id_present:1; | |
1e9a4ed9 | 69 | unsigned flags; |
db50b96c | 70 | unsigned max_read; |
d8091614 | 71 | unsigned blksize; |
d8a5ba45 MS |
72 | }; |
73 | ||
a2daff68 | 74 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
75 | { |
76 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
77 | } | |
78 | ||
d8a5ba45 MS |
79 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
80 | { | |
81 | struct inode *inode; | |
82 | struct fuse_inode *fi; | |
83 | ||
e94b1766 | 84 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
d8a5ba45 MS |
85 | if (!inode) |
86 | return NULL; | |
87 | ||
88 | fi = get_fuse_inode(inode); | |
0a0898cf | 89 | fi->i_time = 0; |
d8a5ba45 | 90 | fi->nodeid = 0; |
9e6268db | 91 | fi->nlookup = 0; |
fbee36b9 | 92 | fi->attr_version = 0; |
3be5a52b | 93 | fi->writectr = 0; |
45c72cd7 | 94 | fi->orig_ino = 0; |
4582a4ab | 95 | fi->state = 0; |
93a8c3cd | 96 | INIT_LIST_HEAD(&fi->write_files); |
3be5a52b MS |
97 | INIT_LIST_HEAD(&fi->queued_writes); |
98 | INIT_LIST_HEAD(&fi->writepages); | |
99 | init_waitqueue_head(&fi->page_waitq); | |
5c672ab3 | 100 | mutex_init(&fi->mutex); |
07e77dca MS |
101 | fi->forget = fuse_alloc_forget(); |
102 | if (!fi->forget) { | |
e5e5558e MS |
103 | kmem_cache_free(fuse_inode_cachep, inode); |
104 | return NULL; | |
105 | } | |
d8a5ba45 MS |
106 | |
107 | return inode; | |
108 | } | |
109 | ||
fa0d7e3d NP |
110 | static void fuse_i_callback(struct rcu_head *head) |
111 | { | |
112 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
113 | kmem_cache_free(fuse_inode_cachep, inode); |
114 | } | |
115 | ||
d8a5ba45 MS |
116 | static void fuse_destroy_inode(struct inode *inode) |
117 | { | |
e5e5558e | 118 | struct fuse_inode *fi = get_fuse_inode(inode); |
93a8c3cd | 119 | BUG_ON(!list_empty(&fi->write_files)); |
3be5a52b | 120 | BUG_ON(!list_empty(&fi->queued_writes)); |
5c672ab3 | 121 | mutex_destroy(&fi->mutex); |
07e77dca | 122 | kfree(fi->forget); |
fa0d7e3d | 123 | call_rcu(&inode->i_rcu, fuse_i_callback); |
d8a5ba45 MS |
124 | } |
125 | ||
b57922d9 | 126 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 127 | { |
91b0abe3 | 128 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 129 | clear_inode(inode); |
1e9a4ed9 MS |
130 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
131 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e5e5558e | 132 | struct fuse_inode *fi = get_fuse_inode(inode); |
07e77dca MS |
133 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
134 | fi->forget = NULL; | |
e5e5558e | 135 | } |
d8a5ba45 MS |
136 | } |
137 | ||
71421259 MS |
138 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
139 | { | |
02b9984d | 140 | sync_filesystem(sb); |
71421259 MS |
141 | if (*flags & MS_MANDLOCK) |
142 | return -EINVAL; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
45c72cd7 PS |
147 | /* |
148 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
149 | * so that it will fit. | |
150 | */ | |
151 | static ino_t fuse_squash_ino(u64 ino64) | |
152 | { | |
153 | ino_t ino = (ino_t) ino64; | |
154 | if (sizeof(ino_t) < sizeof(u64)) | |
155 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
156 | return ino; | |
157 | } | |
158 | ||
3be5a52b MS |
159 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
160 | u64 attr_valid) | |
d8a5ba45 | 161 | { |
9ffbb916 | 162 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 163 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 164 | |
1fb69e78 MS |
165 | fi->attr_version = ++fc->attr_version; |
166 | fi->i_time = attr_valid; | |
167 | ||
45c72cd7 | 168 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 169 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 170 | set_nlink(inode, attr->nlink); |
499dcf20 EB |
171 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
172 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); | |
d8a5ba45 MS |
173 | inode->i_blocks = attr->blocks; |
174 | inode->i_atime.tv_sec = attr->atime; | |
175 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
176 | /* mtime from server may be stale due to local buffered write */ |
177 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
178 | inode->i_mtime.tv_sec = attr->mtime; | |
179 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
180 | inode->i_ctime.tv_sec = attr->ctime; |
181 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 182 | } |
e00d2c2d | 183 | |
0e9663ee MS |
184 | if (attr->blksize != 0) |
185 | inode->i_blkbits = ilog2(attr->blksize); | |
186 | else | |
187 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
188 | ||
ebc14c4d MS |
189 | /* |
190 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
191 | * to check permissions. This prevents failures due to the | |
192 | * check in may_delete(). | |
193 | */ | |
194 | fi->orig_i_mode = inode->i_mode; | |
195 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) | |
196 | inode->i_mode &= ~S_ISVTX; | |
45c72cd7 PS |
197 | |
198 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
199 | } |
200 | ||
201 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
202 | u64 attr_valid, u64 attr_version) | |
203 | { | |
204 | struct fuse_conn *fc = get_fuse_conn(inode); | |
205 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 206 | bool is_wb = fc->writeback_cache; |
3be5a52b | 207 | loff_t oldsize; |
eed2179e | 208 | struct timespec old_mtime; |
3be5a52b MS |
209 | |
210 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
211 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
212 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
3be5a52b MS |
213 | spin_unlock(&fc->lock); |
214 | return; | |
215 | } | |
216 | ||
eed2179e | 217 | old_mtime = inode->i_mtime; |
3be5a52b | 218 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 219 | |
e00d2c2d | 220 | oldsize = inode->i_size; |
8373200b PE |
221 | /* |
222 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
223 | * extend local i_size without keeping userspace server in sync. So, | |
224 | * attr->size coming from server can be stale. We cannot trust it. | |
225 | */ | |
226 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
227 | i_size_write(inode, attr->size); | |
e00d2c2d MS |
228 | spin_unlock(&fc->lock); |
229 | ||
8373200b | 230 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
231 | bool inval = false; |
232 | ||
233 | if (oldsize != attr->size) { | |
7caef267 | 234 | truncate_pagecache(inode, attr->size); |
eed2179e BF |
235 | inval = true; |
236 | } else if (fc->auto_inval_data) { | |
237 | struct timespec new_mtime = { | |
238 | .tv_sec = attr->mtime, | |
239 | .tv_nsec = attr->mtimensec, | |
240 | }; | |
241 | ||
242 | /* | |
243 | * Auto inval mode also checks and invalidates if mtime | |
244 | * has changed. | |
245 | */ | |
246 | if (!timespec_equal(&old_mtime, &new_mtime)) | |
247 | inval = true; | |
248 | } | |
249 | ||
250 | if (inval) | |
251 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 252 | } |
d8a5ba45 MS |
253 | } |
254 | ||
255 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
256 | { | |
257 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 258 | inode->i_size = attr->size; |
b0aa7606 MP |
259 | inode->i_mtime.tv_sec = attr->mtime; |
260 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
261 | inode->i_ctime.tv_sec = attr->ctime; |
262 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
263 | if (S_ISREG(inode->i_mode)) { |
264 | fuse_init_common(inode); | |
b6aeaded | 265 | fuse_init_file_inode(inode); |
e5e5558e MS |
266 | } else if (S_ISDIR(inode->i_mode)) |
267 | fuse_init_dir(inode); | |
268 | else if (S_ISLNK(inode->i_mode)) | |
269 | fuse_init_symlink(inode); | |
270 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
271 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
272 | fuse_init_common(inode); | |
273 | init_special_inode(inode, inode->i_mode, | |
274 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
275 | } else |
276 | BUG(); | |
d8a5ba45 MS |
277 | } |
278 | ||
3b463ae0 | 279 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 280 | { |
b48badf0 | 281 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
282 | if (get_node_id(inode) == nodeid) |
283 | return 1; | |
284 | else | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
289 | { | |
b48badf0 | 290 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
291 | get_fuse_inode(inode)->nodeid = nodeid; |
292 | return 0; | |
293 | } | |
294 | ||
b48badf0 | 295 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
296 | int generation, struct fuse_attr *attr, |
297 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
298 | { |
299 | struct inode *inode; | |
9e6268db | 300 | struct fuse_inode *fi; |
d8a5ba45 | 301 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
302 | |
303 | retry: | |
304 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
305 | if (!inode) | |
306 | return NULL; | |
307 | ||
308 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 309 | inode->i_flags |= S_NOATIME; |
d31433c8 | 310 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 311 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 312 | inode->i_generation = generation; |
d8a5ba45 MS |
313 | fuse_init_inode(inode, attr); |
314 | unlock_new_inode(inode); | |
315 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
316 | /* Inode has changed type, any I/O on the old should fail */ |
317 | make_bad_inode(inode); | |
318 | iput(inode); | |
d8a5ba45 MS |
319 | goto retry; |
320 | } | |
321 | ||
9e6268db | 322 | fi = get_fuse_inode(inode); |
8da5ff23 | 323 | spin_lock(&fc->lock); |
1729a16c | 324 | fi->nlookup++; |
8da5ff23 | 325 | spin_unlock(&fc->lock); |
1fb69e78 MS |
326 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
327 | ||
d8a5ba45 MS |
328 | return inode; |
329 | } | |
330 | ||
3b463ae0 JM |
331 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
332 | loff_t offset, loff_t len) | |
333 | { | |
334 | struct inode *inode; | |
335 | pgoff_t pg_start; | |
336 | pgoff_t pg_end; | |
337 | ||
338 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
339 | if (!inode) | |
340 | return -ENOENT; | |
341 | ||
342 | fuse_invalidate_attr(inode); | |
343 | if (offset >= 0) { | |
09cbfeaf | 344 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
345 | if (len <= 0) |
346 | pg_end = -1; | |
347 | else | |
09cbfeaf | 348 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
349 | invalidate_inode_pages2_range(inode->i_mapping, |
350 | pg_start, pg_end); | |
351 | } | |
352 | iput(inode); | |
353 | return 0; | |
354 | } | |
355 | ||
5c672ab3 MS |
356 | void fuse_lock_inode(struct inode *inode) |
357 | { | |
358 | if (!get_fuse_conn(inode)->parallel_dirops) | |
359 | mutex_lock(&get_fuse_inode(inode)->mutex); | |
360 | } | |
361 | ||
362 | void fuse_unlock_inode(struct inode *inode) | |
363 | { | |
364 | if (!get_fuse_conn(inode)->parallel_dirops) | |
365 | mutex_unlock(&get_fuse_inode(inode)->mutex); | |
366 | } | |
367 | ||
42faad99 | 368 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 369 | { |
42faad99 | 370 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
371 | } |
372 | ||
0ec7ca41 MS |
373 | static void fuse_send_destroy(struct fuse_conn *fc) |
374 | { | |
375 | struct fuse_req *req = fc->destroy_req; | |
376 | if (req && fc->conn_init) { | |
377 | fc->destroy_req = NULL; | |
378 | req->in.h.opcode = FUSE_DESTROY; | |
825d6d33 MS |
379 | __set_bit(FR_FORCE, &req->flags); |
380 | __clear_bit(FR_BACKGROUND, &req->flags); | |
b93f858a | 381 | fuse_request_send(fc, req); |
0ec7ca41 MS |
382 | fuse_put_request(fc, req); |
383 | } | |
384 | } | |
385 | ||
a325f9b9 | 386 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
d8a5ba45 | 387 | { |
a325f9b9 TH |
388 | if (fc->bdi_initialized) |
389 | bdi_destroy(&fc->bdi); | |
390 | } | |
d8a5ba45 | 391 | |
a325f9b9 TH |
392 | static void fuse_put_super(struct super_block *sb) |
393 | { | |
394 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
395 | ||
396 | fuse_send_destroy(fc); | |
bbd99797 | 397 | |
580640ba | 398 | fuse_abort_conn(fc); |
bbd99797 MS |
399 | mutex_lock(&fuse_mutex); |
400 | list_del(&fc->entry); | |
401 | fuse_ctl_remove_conn(fc); | |
402 | mutex_unlock(&fuse_mutex); | |
403 | fuse_bdi_destroy(fc); | |
404 | ||
bafa9654 | 405 | fuse_conn_put(fc); |
d8a5ba45 MS |
406 | } |
407 | ||
e5e5558e MS |
408 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
409 | { | |
410 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
411 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 412 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
413 | stbuf->f_blocks = attr->blocks; |
414 | stbuf->f_bfree = attr->bfree; | |
415 | stbuf->f_bavail = attr->bavail; | |
416 | stbuf->f_files = attr->files; | |
417 | stbuf->f_ffree = attr->ffree; | |
418 | stbuf->f_namelen = attr->namelen; | |
419 | /* fsid is left zero */ | |
420 | } | |
421 | ||
726c3342 | 422 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 423 | { |
726c3342 | 424 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 425 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 426 | FUSE_ARGS(args); |
e5e5558e MS |
427 | struct fuse_statfs_out outarg; |
428 | int err; | |
429 | ||
c2132c1b | 430 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
431 | buf->f_type = FUSE_SUPER_MAGIC; |
432 | return 0; | |
433 | } | |
434 | ||
de5f1202 | 435 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
436 | args.in.numargs = 0; |
437 | args.in.h.opcode = FUSE_STATFS; | |
2b0143b5 | 438 | args.in.h.nodeid = get_node_id(d_inode(dentry)); |
7078187a | 439 | args.out.numargs = 1; |
21f62174 | 440 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
441 | args.out.args[0].value = &outarg; |
442 | err = fuse_simple_request(fc, &args); | |
e5e5558e MS |
443 | if (!err) |
444 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
445 | return err; |
446 | } | |
447 | ||
d8a5ba45 MS |
448 | enum { |
449 | OPT_FD, | |
450 | OPT_ROOTMODE, | |
451 | OPT_USER_ID, | |
87729a55 | 452 | OPT_GROUP_ID, |
d8a5ba45 MS |
453 | OPT_DEFAULT_PERMISSIONS, |
454 | OPT_ALLOW_OTHER, | |
db50b96c | 455 | OPT_MAX_READ, |
d8091614 | 456 | OPT_BLKSIZE, |
d8a5ba45 MS |
457 | OPT_ERR |
458 | }; | |
459 | ||
a447c093 | 460 | static const match_table_t tokens = { |
d8a5ba45 MS |
461 | {OPT_FD, "fd=%u"}, |
462 | {OPT_ROOTMODE, "rootmode=%o"}, | |
463 | {OPT_USER_ID, "user_id=%u"}, | |
87729a55 | 464 | {OPT_GROUP_ID, "group_id=%u"}, |
d8a5ba45 MS |
465 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
466 | {OPT_ALLOW_OTHER, "allow_other"}, | |
db50b96c | 467 | {OPT_MAX_READ, "max_read=%u"}, |
d8091614 | 468 | {OPT_BLKSIZE, "blksize=%u"}, |
d8a5ba45 MS |
469 | {OPT_ERR, NULL} |
470 | }; | |
471 | ||
233a01fa MS |
472 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
473 | { | |
474 | int err = -ENOMEM; | |
475 | char *buf = match_strdup(s); | |
476 | if (buf) { | |
477 | err = kstrtouint(buf, 10, res); | |
478 | kfree(buf); | |
479 | } | |
480 | return err; | |
481 | } | |
482 | ||
d8091614 | 483 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
d8a5ba45 MS |
484 | { |
485 | char *p; | |
486 | memset(d, 0, sizeof(struct fuse_mount_data)); | |
db50b96c | 487 | d->max_read = ~0; |
d1875dba | 488 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
d8a5ba45 MS |
489 | |
490 | while ((p = strsep(&opt, ",")) != NULL) { | |
491 | int token; | |
492 | int value; | |
233a01fa | 493 | unsigned uv; |
d8a5ba45 MS |
494 | substring_t args[MAX_OPT_ARGS]; |
495 | if (!*p) | |
496 | continue; | |
497 | ||
498 | token = match_token(p, tokens, args); | |
499 | switch (token) { | |
500 | case OPT_FD: | |
501 | if (match_int(&args[0], &value)) | |
502 | return 0; | |
503 | d->fd = value; | |
5a533682 | 504 | d->fd_present = 1; |
d8a5ba45 MS |
505 | break; |
506 | ||
507 | case OPT_ROOTMODE: | |
508 | if (match_octal(&args[0], &value)) | |
509 | return 0; | |
a5bfffac TS |
510 | if (!fuse_valid_type(value)) |
511 | return 0; | |
d8a5ba45 | 512 | d->rootmode = value; |
5a533682 | 513 | d->rootmode_present = 1; |
d8a5ba45 MS |
514 | break; |
515 | ||
516 | case OPT_USER_ID: | |
233a01fa | 517 | if (fuse_match_uint(&args[0], &uv)) |
d8a5ba45 | 518 | return 0; |
233a01fa | 519 | d->user_id = make_kuid(current_user_ns(), uv); |
499dcf20 EB |
520 | if (!uid_valid(d->user_id)) |
521 | return 0; | |
5a533682 | 522 | d->user_id_present = 1; |
d8a5ba45 MS |
523 | break; |
524 | ||
87729a55 | 525 | case OPT_GROUP_ID: |
233a01fa | 526 | if (fuse_match_uint(&args[0], &uv)) |
87729a55 | 527 | return 0; |
233a01fa | 528 | d->group_id = make_kgid(current_user_ns(), uv); |
499dcf20 EB |
529 | if (!gid_valid(d->group_id)) |
530 | return 0; | |
5a533682 | 531 | d->group_id_present = 1; |
87729a55 MS |
532 | break; |
533 | ||
1e9a4ed9 MS |
534 | case OPT_DEFAULT_PERMISSIONS: |
535 | d->flags |= FUSE_DEFAULT_PERMISSIONS; | |
536 | break; | |
537 | ||
538 | case OPT_ALLOW_OTHER: | |
539 | d->flags |= FUSE_ALLOW_OTHER; | |
540 | break; | |
541 | ||
db50b96c MS |
542 | case OPT_MAX_READ: |
543 | if (match_int(&args[0], &value)) | |
544 | return 0; | |
545 | d->max_read = value; | |
546 | break; | |
547 | ||
d8091614 MS |
548 | case OPT_BLKSIZE: |
549 | if (!is_bdev || match_int(&args[0], &value)) | |
550 | return 0; | |
551 | d->blksize = value; | |
552 | break; | |
553 | ||
d8a5ba45 MS |
554 | default: |
555 | return 0; | |
556 | } | |
557 | } | |
5a533682 MS |
558 | |
559 | if (!d->fd_present || !d->rootmode_present || | |
560 | !d->user_id_present || !d->group_id_present) | |
d8a5ba45 MS |
561 | return 0; |
562 | ||
563 | return 1; | |
564 | } | |
565 | ||
34c80b1d | 566 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 567 | { |
34c80b1d AV |
568 | struct super_block *sb = root->d_sb; |
569 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 570 | |
499dcf20 EB |
571 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
572 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); | |
1e9a4ed9 MS |
573 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
574 | seq_puts(m, ",default_permissions"); | |
575 | if (fc->flags & FUSE_ALLOW_OTHER) | |
576 | seq_puts(m, ",allow_other"); | |
db50b96c MS |
577 | if (fc->max_read != ~0) |
578 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
579 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
580 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
581 | return 0; |
582 | } | |
583 | ||
f88996a9 MS |
584 | static void fuse_iqueue_init(struct fuse_iqueue *fiq) |
585 | { | |
586 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
587 | init_waitqueue_head(&fiq->waitq); | |
588 | INIT_LIST_HEAD(&fiq->pending); | |
589 | INIT_LIST_HEAD(&fiq->interrupts); | |
590 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 591 | fiq->connected = 1; |
f88996a9 MS |
592 | } |
593 | ||
3a2b5b9c MS |
594 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
595 | { | |
596 | memset(fpq, 0, sizeof(struct fuse_pqueue)); | |
45a91cb1 | 597 | spin_lock_init(&fpq->lock); |
3a2b5b9c MS |
598 | INIT_LIST_HEAD(&fpq->processing); |
599 | INIT_LIST_HEAD(&fpq->io); | |
e96edd94 | 600 | fpq->connected = 1; |
3a2b5b9c MS |
601 | } |
602 | ||
a325f9b9 | 603 | void fuse_conn_init(struct fuse_conn *fc) |
d8a5ba45 | 604 | { |
0d179aa5 TH |
605 | memset(fc, 0, sizeof(*fc)); |
606 | spin_lock_init(&fc->lock); | |
3b463ae0 | 607 | init_rwsem(&fc->killsb); |
0d179aa5 | 608 | atomic_set(&fc->count, 1); |
c3696046 | 609 | atomic_set(&fc->dev_count, 1); |
0d179aa5 TH |
610 | init_waitqueue_head(&fc->blocked_waitq); |
611 | init_waitqueue_head(&fc->reserved_req_waitq); | |
f88996a9 | 612 | fuse_iqueue_init(&fc->iq); |
0d179aa5 TH |
613 | INIT_LIST_HEAD(&fc->bg_queue); |
614 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 615 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 616 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
617 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
618 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
0d179aa5 TH |
619 | fc->khctr = 0; |
620 | fc->polled_files = RB_ROOT; | |
0aada884 | 621 | fc->blocked = 0; |
796523fb | 622 | fc->initialized = 0; |
e16714d8 | 623 | fc->connected = 1; |
0d179aa5 TH |
624 | fc->attr_version = 1; |
625 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); | |
d8a5ba45 | 626 | } |
0d179aa5 | 627 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
d8a5ba45 | 628 | |
bafa9654 MS |
629 | void fuse_conn_put(struct fuse_conn *fc) |
630 | { | |
d2a85164 | 631 | if (atomic_dec_and_test(&fc->count)) { |
0ec7ca41 MS |
632 | if (fc->destroy_req) |
633 | fuse_request_free(fc->destroy_req); | |
43901aab | 634 | fc->release(fc); |
d2a85164 | 635 | } |
bafa9654 | 636 | } |
08cbf542 | 637 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
638 | |
639 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
640 | { | |
641 | atomic_inc(&fc->count); | |
642 | return fc; | |
643 | } | |
08cbf542 | 644 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 645 | |
b93f858a | 646 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
647 | { |
648 | struct fuse_attr attr; | |
649 | memset(&attr, 0, sizeof(attr)); | |
650 | ||
651 | attr.mode = mode; | |
652 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 653 | attr.nlink = 1; |
1fb69e78 | 654 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
655 | } |
656 | ||
1729a16c | 657 | struct fuse_inode_handle { |
dbd561d2 MS |
658 | u64 nodeid; |
659 | u32 generation; | |
660 | }; | |
661 | ||
662 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
663 | struct fuse_inode_handle *handle) | |
664 | { | |
33670fa2 | 665 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
666 | struct inode *inode; |
667 | struct dentry *entry; | |
668 | int err = -ESTALE; | |
669 | ||
670 | if (handle->nodeid == 0) | |
671 | goto out_err; | |
672 | ||
673 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
674 | if (!inode) { |
675 | struct fuse_entry_out outarg; | |
13983d06 | 676 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
677 | |
678 | if (!fc->export_support) | |
679 | goto out_err; | |
680 | ||
33670fa2 MS |
681 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
682 | &inode); | |
683 | if (err && err != -ENOENT) | |
684 | goto out_err; | |
685 | if (err || !inode) { | |
686 | err = -ESTALE; | |
687 | goto out_err; | |
688 | } | |
689 | err = -EIO; | |
690 | if (get_node_id(inode) != handle->nodeid) | |
691 | goto out_iput; | |
692 | } | |
dbd561d2 MS |
693 | err = -ESTALE; |
694 | if (inode->i_generation != handle->generation) | |
695 | goto out_iput; | |
696 | ||
44003728 | 697 | entry = d_obtain_alias(inode); |
c35eebe9 | 698 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 699 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
700 | |
701 | return entry; | |
702 | ||
703 | out_iput: | |
704 | iput(inode); | |
705 | out_err: | |
706 | return ERR_PTR(err); | |
707 | } | |
708 | ||
b0b0382b AV |
709 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
710 | struct inode *parent) | |
dbd561d2 | 711 | { |
b0b0382b | 712 | int len = parent ? 6 : 3; |
dbd561d2 MS |
713 | u64 nodeid; |
714 | u32 generation; | |
715 | ||
5fe0c237 AK |
716 | if (*max_len < len) { |
717 | *max_len = len; | |
94e07a75 | 718 | return FILEID_INVALID; |
5fe0c237 | 719 | } |
dbd561d2 MS |
720 | |
721 | nodeid = get_fuse_inode(inode)->nodeid; | |
722 | generation = inode->i_generation; | |
723 | ||
724 | fh[0] = (u32)(nodeid >> 32); | |
725 | fh[1] = (u32)(nodeid & 0xffffffff); | |
726 | fh[2] = generation; | |
727 | ||
b0b0382b | 728 | if (parent) { |
dbd561d2 MS |
729 | nodeid = get_fuse_inode(parent)->nodeid; |
730 | generation = parent->i_generation; | |
dbd561d2 MS |
731 | |
732 | fh[3] = (u32)(nodeid >> 32); | |
733 | fh[4] = (u32)(nodeid & 0xffffffff); | |
734 | fh[5] = generation; | |
735 | } | |
736 | ||
737 | *max_len = len; | |
b0b0382b | 738 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
739 | } |
740 | ||
741 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
742 | struct fid *fid, int fh_len, int fh_type) | |
743 | { | |
744 | struct fuse_inode_handle handle; | |
745 | ||
746 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
747 | return NULL; | |
748 | ||
749 | handle.nodeid = (u64) fid->raw[0] << 32; | |
750 | handle.nodeid |= (u64) fid->raw[1]; | |
751 | handle.generation = fid->raw[2]; | |
752 | return fuse_get_dentry(sb, &handle); | |
753 | } | |
754 | ||
755 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
756 | struct fid *fid, int fh_len, int fh_type) | |
757 | { | |
758 | struct fuse_inode_handle parent; | |
759 | ||
760 | if (fh_type != 0x82 || fh_len < 6) | |
761 | return NULL; | |
762 | ||
763 | parent.nodeid = (u64) fid->raw[3] << 32; | |
764 | parent.nodeid |= (u64) fid->raw[4]; | |
765 | parent.generation = fid->raw[5]; | |
766 | return fuse_get_dentry(sb, &parent); | |
767 | } | |
768 | ||
33670fa2 MS |
769 | static struct dentry *fuse_get_parent(struct dentry *child) |
770 | { | |
2b0143b5 | 771 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
772 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
773 | struct inode *inode; | |
774 | struct dentry *parent; | |
775 | struct fuse_entry_out outarg; | |
13983d06 | 776 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
777 | int err; |
778 | ||
779 | if (!fc->export_support) | |
780 | return ERR_PTR(-ESTALE); | |
781 | ||
33670fa2 MS |
782 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
783 | &name, &outarg, &inode); | |
44003728 CH |
784 | if (err) { |
785 | if (err == -ENOENT) | |
786 | return ERR_PTR(-ESTALE); | |
33670fa2 | 787 | return ERR_PTR(err); |
33670fa2 | 788 | } |
44003728 CH |
789 | |
790 | parent = d_obtain_alias(inode); | |
c35eebe9 | 791 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 792 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
793 | |
794 | return parent; | |
795 | } | |
dbd561d2 MS |
796 | |
797 | static const struct export_operations fuse_export_operations = { | |
798 | .fh_to_dentry = fuse_fh_to_dentry, | |
799 | .fh_to_parent = fuse_fh_to_parent, | |
800 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 801 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
802 | }; |
803 | ||
ee9b6d61 | 804 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 MS |
805 | .alloc_inode = fuse_alloc_inode, |
806 | .destroy_inode = fuse_destroy_inode, | |
b57922d9 | 807 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 808 | .write_inode = fuse_write_inode, |
ead5f0b5 | 809 | .drop_inode = generic_delete_inode, |
71421259 | 810 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 811 | .put_super = fuse_put_super, |
69a53bf2 | 812 | .umount_begin = fuse_umount_begin, |
e5e5558e | 813 | .statfs = fuse_statfs, |
d8a5ba45 MS |
814 | .show_options = fuse_show_options, |
815 | }; | |
816 | ||
487ea5af CH |
817 | static void sanitize_global_limit(unsigned *limit) |
818 | { | |
819 | if (*limit == 0) | |
0ed5fd13 | 820 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
487ea5af CH |
821 | sizeof(struct fuse_req); |
822 | ||
823 | if (*limit >= 1 << 16) | |
824 | *limit = (1 << 16) - 1; | |
825 | } | |
826 | ||
827 | static int set_global_limit(const char *val, struct kernel_param *kp) | |
828 | { | |
829 | int rv; | |
830 | ||
831 | rv = param_set_uint(val, kp); | |
832 | if (rv) | |
833 | return rv; | |
834 | ||
835 | sanitize_global_limit((unsigned *)kp->arg); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
841 | { | |
842 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
843 | ||
844 | if (arg->minor < 13) | |
845 | return; | |
846 | ||
847 | sanitize_global_limit(&max_user_bgreq); | |
848 | sanitize_global_limit(&max_user_congthresh); | |
849 | ||
850 | if (arg->max_background) { | |
851 | fc->max_background = arg->max_background; | |
852 | ||
853 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
854 | fc->max_background = max_user_bgreq; | |
855 | } | |
856 | if (arg->congestion_threshold) { | |
857 | fc->congestion_threshold = arg->congestion_threshold; | |
858 | ||
859 | if (!cap_sys_admin && | |
860 | fc->congestion_threshold > max_user_congthresh) | |
861 | fc->congestion_threshold = max_user_congthresh; | |
862 | } | |
863 | } | |
864 | ||
9b9a0469 MS |
865 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
866 | { | |
9b9a0469 MS |
867 | struct fuse_init_out *arg = &req->misc.init_out; |
868 | ||
869 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) | |
870 | fc->conn_error = 1; | |
871 | else { | |
9cd68455 MS |
872 | unsigned long ra_pages; |
873 | ||
487ea5af CH |
874 | process_init_limits(fc, arg); |
875 | ||
9cd68455 | 876 | if (arg->minor >= 6) { |
09cbfeaf | 877 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
878 | if (arg->flags & FUSE_ASYNC_READ) |
879 | fc->async_read = 1; | |
71421259 MS |
880 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
881 | fc->no_lock = 1; | |
37fb3a30 MS |
882 | if (arg->minor >= 17) { |
883 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
884 | fc->no_flock = 1; | |
24114504 MS |
885 | } else { |
886 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
887 | fc->no_flock = 1; | |
37fb3a30 | 888 | } |
6ff958ed MS |
889 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
890 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
891 | if (arg->minor >= 9) { |
892 | /* LOOKUP has dependency on proto version */ | |
893 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
894 | fc->export_support = 1; | |
895 | } | |
78bb6cb9 MS |
896 | if (arg->flags & FUSE_BIG_WRITES) |
897 | fc->big_writes = 1; | |
e0a43ddc MS |
898 | if (arg->flags & FUSE_DONT_MASK) |
899 | fc->dont_mask = 1; | |
72d0d248 BF |
900 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
901 | fc->auto_inval_data = 1; | |
28420dad | 902 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 903 | fc->do_readdirplus = 1; |
28420dad MS |
904 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
905 | fc->readdirplus_auto = 1; | |
906 | } | |
60b9df7a MS |
907 | if (arg->flags & FUSE_ASYNC_DIO) |
908 | fc->async_dio = 1; | |
4d99ff8f PE |
909 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
910 | fc->writeback_cache = 1; | |
5c672ab3 MS |
911 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
912 | fc->parallel_dirops = 1; | |
e27c9d38 MS |
913 | if (arg->time_gran && arg->time_gran <= 1000000000) |
914 | fc->sb->s_time_gran = arg->time_gran; | |
71421259 | 915 | } else { |
09cbfeaf | 916 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 917 | fc->no_lock = 1; |
37fb3a30 | 918 | fc->no_flock = 1; |
71421259 | 919 | } |
9cd68455 MS |
920 | |
921 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); | |
9b9a0469 MS |
922 | fc->minor = arg->minor; |
923 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 924 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 925 | fc->conn_init = 1; |
9b9a0469 | 926 | } |
9759bd51 | 927 | fuse_set_initialized(fc); |
08a53cdc | 928 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
929 | } |
930 | ||
ce1d5a49 | 931 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
9b9a0469 | 932 | { |
9b9a0469 | 933 | struct fuse_init_in *arg = &req->misc.init_in; |
095da6cb | 934 | |
9b9a0469 MS |
935 | arg->major = FUSE_KERNEL_VERSION; |
936 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
09cbfeaf | 937 | arg->max_readahead = fc->bdi.ra_pages * PAGE_SIZE; |
78bb6cb9 | 938 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
37fb3a30 | 939 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 940 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 941 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 942 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 MS |
943 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
944 | FUSE_PARALLEL_DIROPS; | |
9b9a0469 MS |
945 | req->in.h.opcode = FUSE_INIT; |
946 | req->in.numargs = 1; | |
947 | req->in.args[0].size = sizeof(*arg); | |
948 | req->in.args[0].value = arg; | |
949 | req->out.numargs = 1; | |
3ad2f3fb | 950 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
951 | with interface version < 7.5. Rest of init_out is zeroed |
952 | by do_get_request(), so a short reply is not a problem */ | |
953 | req->out.argvar = 1; | |
954 | req->out.args[0].size = sizeof(struct fuse_init_out); | |
955 | req->out.args[0].value = &req->misc.init_out; | |
956 | req->end = process_init_reply; | |
b93f858a | 957 | fuse_request_send_background(fc, req); |
9b9a0469 MS |
958 | } |
959 | ||
43901aab TH |
960 | static void fuse_free_conn(struct fuse_conn *fc) |
961 | { | |
cc080e9e | 962 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 963 | kfree_rcu(fc, rcu); |
43901aab TH |
964 | } |
965 | ||
a325f9b9 TH |
966 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
967 | { | |
968 | int err; | |
969 | ||
d993831f | 970 | fc->bdi.name = "fuse"; |
09cbfeaf | 971 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
a325f9b9 | 972 | /* fuse does it's own writeback accounting */ |
5a537485 | 973 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; |
a325f9b9 TH |
974 | |
975 | err = bdi_init(&fc->bdi); | |
976 | if (err) | |
977 | return err; | |
978 | ||
979 | fc->bdi_initialized = 1; | |
980 | ||
981 | if (sb->s_bdev) { | |
982 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", | |
983 | MAJOR(fc->dev), MINOR(fc->dev)); | |
984 | } else { | |
985 | err = bdi_register_dev(&fc->bdi, fc->dev); | |
986 | } | |
987 | ||
988 | if (err) | |
989 | return err; | |
990 | ||
991 | /* | |
992 | * For a single fuse filesystem use max 1% of dirty + | |
993 | * writeback threshold. | |
994 | * | |
995 | * This gives about 1M of write buffer for memory maps on a | |
996 | * machine with 1G and 10% dirty_ratio, which should be more | |
997 | * than enough. | |
998 | * | |
999 | * Privileged users can raise it by writing to | |
1000 | * | |
1001 | * /sys/class/bdi/<bdi>/max_ratio | |
1002 | */ | |
1003 | bdi_set_max_ratio(&fc->bdi, 1); | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
cc080e9e MS |
1008 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) |
1009 | { | |
1010 | struct fuse_dev *fud; | |
1011 | ||
1012 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
1013 | if (fud) { | |
1014 | fud->fc = fuse_conn_get(fc); | |
c3696046 | 1015 | fuse_pqueue_init(&fud->pq); |
cc080e9e MS |
1016 | |
1017 | spin_lock(&fc->lock); | |
1018 | list_add_tail(&fud->entry, &fc->devices); | |
1019 | spin_unlock(&fc->lock); | |
1020 | } | |
1021 | ||
1022 | return fud; | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1025 | ||
1026 | void fuse_dev_free(struct fuse_dev *fud) | |
1027 | { | |
1028 | struct fuse_conn *fc = fud->fc; | |
1029 | ||
1030 | if (fc) { | |
1031 | spin_lock(&fc->lock); | |
1032 | list_del(&fud->entry); | |
1033 | spin_unlock(&fc->lock); | |
1034 | ||
1035 | fuse_conn_put(fc); | |
1036 | } | |
1037 | kfree(fud); | |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1040 | ||
d8a5ba45 MS |
1041 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
1042 | { | |
cc080e9e | 1043 | struct fuse_dev *fud; |
d8a5ba45 MS |
1044 | struct fuse_conn *fc; |
1045 | struct inode *root; | |
1046 | struct fuse_mount_data d; | |
1047 | struct file *file; | |
f543f253 | 1048 | struct dentry *root_dentry; |
ce1d5a49 | 1049 | struct fuse_req *init_req; |
d8a5ba45 | 1050 | int err; |
d8091614 | 1051 | int is_bdev = sb->s_bdev != NULL; |
d8a5ba45 | 1052 | |
c2b8f006 | 1053 | err = -EINVAL; |
71421259 | 1054 | if (sb->s_flags & MS_MANDLOCK) |
c2b8f006 | 1055 | goto err; |
71421259 | 1056 | |
4ace1f85 | 1057 | sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); |
9e1f1de0 | 1058 | |
7b3d8bf7 | 1059 | if (!parse_fuse_opt(data, &d, is_bdev)) |
c2b8f006 | 1060 | goto err; |
d8a5ba45 | 1061 | |
d8091614 | 1062 | if (is_bdev) { |
875d95ec | 1063 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1064 | err = -EINVAL; |
d8091614 | 1065 | if (!sb_set_blocksize(sb, d.blksize)) |
c2b8f006 | 1066 | goto err; |
875d95ec | 1067 | #endif |
d8091614 | 1068 | } else { |
09cbfeaf KS |
1069 | sb->s_blocksize = PAGE_SIZE; |
1070 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1071 | } |
d8a5ba45 MS |
1072 | sb->s_magic = FUSE_SUPER_MAGIC; |
1073 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1074 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1075 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1076 | sb->s_time_gran = 1; |
dbd561d2 | 1077 | sb->s_export_op = &fuse_export_operations; |
d8a5ba45 MS |
1078 | |
1079 | file = fget(d.fd); | |
c2b8f006 | 1080 | err = -EINVAL; |
d8a5ba45 | 1081 | if (!file) |
c2b8f006 | 1082 | goto err; |
d8a5ba45 | 1083 | |
499dcf20 EB |
1084 | if ((file->f_op != &fuse_dev_operations) || |
1085 | (file->f_cred->user_ns != &init_user_ns)) | |
c2b8f006 | 1086 | goto err_fput; |
0720b315 | 1087 | |
0d179aa5 | 1088 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
c2b8f006 MS |
1089 | err = -ENOMEM; |
1090 | if (!fc) | |
1091 | goto err_fput; | |
d8a5ba45 | 1092 | |
a325f9b9 | 1093 | fuse_conn_init(fc); |
0ad0b325 | 1094 | fc->release = fuse_free_conn; |
a325f9b9 | 1095 | |
cc080e9e MS |
1096 | fud = fuse_dev_alloc(fc); |
1097 | if (!fud) | |
1098 | goto err_put_conn; | |
1099 | ||
a325f9b9 | 1100 | fc->dev = sb->s_dev; |
3b463ae0 | 1101 | fc->sb = sb; |
a325f9b9 TH |
1102 | err = fuse_bdi_init(fc, sb); |
1103 | if (err) | |
cc080e9e | 1104 | goto err_dev_free; |
0d179aa5 | 1105 | |
32a88aa1 JA |
1106 | sb->s_bdi = &fc->bdi; |
1107 | ||
e0a43ddc MS |
1108 | /* Handle umasking inside the fuse code */ |
1109 | if (sb->s_flags & MS_POSIXACL) | |
1110 | fc->dont_mask = 1; | |
1111 | sb->s_flags |= MS_POSIXACL; | |
1112 | ||
1e9a4ed9 | 1113 | fc->flags = d.flags; |
d8a5ba45 | 1114 | fc->user_id = d.user_id; |
87729a55 | 1115 | fc->group_id = d.group_id; |
f948d564 | 1116 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
d8a5ba45 | 1117 | |
f543f253 MS |
1118 | /* Used by get_root_inode() */ |
1119 | sb->s_fs_info = fc; | |
1120 | ||
d8a5ba45 | 1121 | err = -ENOMEM; |
b93f858a | 1122 | root = fuse_get_root_inode(sb, d.rootmode); |
48fde701 AV |
1123 | root_dentry = d_make_root(root); |
1124 | if (!root_dentry) | |
cc080e9e | 1125 | goto err_dev_free; |
c35eebe9 AV |
1126 | /* only now - we want root dentry with NULL ->d_op */ |
1127 | sb->s_d_op = &fuse_dentry_operations; | |
f543f253 | 1128 | |
4250c066 | 1129 | init_req = fuse_request_alloc(0); |
ce1d5a49 MS |
1130 | if (!init_req) |
1131 | goto err_put_root; | |
825d6d33 | 1132 | __set_bit(FR_BACKGROUND, &init_req->flags); |
ce1d5a49 | 1133 | |
0ec7ca41 | 1134 | if (is_bdev) { |
4250c066 | 1135 | fc->destroy_req = fuse_request_alloc(0); |
0ec7ca41 | 1136 | if (!fc->destroy_req) |
17e18ab6 | 1137 | goto err_free_init_req; |
0ec7ca41 MS |
1138 | } |
1139 | ||
bafa9654 | 1140 | mutex_lock(&fuse_mutex); |
8aa09a50 MS |
1141 | err = -EINVAL; |
1142 | if (file->private_data) | |
bafa9654 | 1143 | goto err_unlock; |
8aa09a50 | 1144 | |
bafa9654 MS |
1145 | err = fuse_ctl_add_conn(fc); |
1146 | if (err) | |
1147 | goto err_unlock; | |
1148 | ||
1149 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1150 | sb->s_root = root_dentry; |
cc080e9e | 1151 | file->private_data = fud; |
bafa9654 | 1152 | mutex_unlock(&fuse_mutex); |
0720b315 MS |
1153 | /* |
1154 | * atomic_dec_and_test() in fput() provides the necessary | |
1155 | * memory barrier for file->private_data to be visible on all | |
1156 | * CPUs after this | |
1157 | */ | |
1158 | fput(file); | |
f543f253 | 1159 | |
ce1d5a49 | 1160 | fuse_send_init(fc, init_req); |
f543f253 | 1161 | |
d8a5ba45 MS |
1162 | return 0; |
1163 | ||
bafa9654 MS |
1164 | err_unlock: |
1165 | mutex_unlock(&fuse_mutex); | |
17e18ab6 | 1166 | err_free_init_req: |
ce1d5a49 | 1167 | fuse_request_free(init_req); |
f543f253 MS |
1168 | err_put_root: |
1169 | dput(root_dentry); | |
cc080e9e MS |
1170 | err_dev_free: |
1171 | fuse_dev_free(fud); | |
c2b8f006 | 1172 | err_put_conn: |
a325f9b9 | 1173 | fuse_bdi_destroy(fc); |
bafa9654 | 1174 | fuse_conn_put(fc); |
c2b8f006 MS |
1175 | err_fput: |
1176 | fput(file); | |
1177 | err: | |
d8a5ba45 MS |
1178 | return err; |
1179 | } | |
1180 | ||
3c26ff6e | 1181 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
454e2398 | 1182 | int flags, const char *dev_name, |
3c26ff6e | 1183 | void *raw_data) |
d8a5ba45 | 1184 | { |
3c26ff6e | 1185 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
d8a5ba45 MS |
1186 | } |
1187 | ||
3b463ae0 JM |
1188 | static void fuse_kill_sb_anon(struct super_block *sb) |
1189 | { | |
1190 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1191 | ||
1192 | if (fc) { | |
1193 | down_write(&fc->killsb); | |
1194 | fc->sb = NULL; | |
1195 | up_write(&fc->killsb); | |
1196 | } | |
1197 | ||
1198 | kill_anon_super(sb); | |
1199 | } | |
1200 | ||
875d95ec MS |
1201 | static struct file_system_type fuse_fs_type = { |
1202 | .owner = THIS_MODULE, | |
1203 | .name = "fuse", | |
79c0b2df | 1204 | .fs_flags = FS_HAS_SUBTYPE, |
3c26ff6e | 1205 | .mount = fuse_mount, |
3b463ae0 | 1206 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1207 | }; |
7f78e035 | 1208 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1209 | |
1210 | #ifdef CONFIG_BLOCK | |
152a0836 | 1211 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
d6392f87 | 1212 | int flags, const char *dev_name, |
152a0836 | 1213 | void *raw_data) |
d6392f87 | 1214 | { |
152a0836 | 1215 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
d6392f87 MS |
1216 | } |
1217 | ||
3b463ae0 JM |
1218 | static void fuse_kill_sb_blk(struct super_block *sb) |
1219 | { | |
1220 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1221 | ||
1222 | if (fc) { | |
1223 | down_write(&fc->killsb); | |
1224 | fc->sb = NULL; | |
1225 | up_write(&fc->killsb); | |
1226 | } | |
1227 | ||
1228 | kill_block_super(sb); | |
1229 | } | |
1230 | ||
d6392f87 MS |
1231 | static struct file_system_type fuseblk_fs_type = { |
1232 | .owner = THIS_MODULE, | |
1233 | .name = "fuseblk", | |
152a0836 | 1234 | .mount = fuse_mount_blk, |
3b463ae0 | 1235 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1236 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1237 | }; |
7f78e035 | 1238 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1239 | |
875d95ec MS |
1240 | static inline int register_fuseblk(void) |
1241 | { | |
1242 | return register_filesystem(&fuseblk_fs_type); | |
1243 | } | |
1244 | ||
1245 | static inline void unregister_fuseblk(void) | |
1246 | { | |
1247 | unregister_filesystem(&fuseblk_fs_type); | |
1248 | } | |
1249 | #else | |
1250 | static inline int register_fuseblk(void) | |
1251 | { | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | static inline void unregister_fuseblk(void) | |
1256 | { | |
1257 | } | |
1258 | #endif | |
1259 | ||
51cc5068 | 1260 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1261 | { |
1729a16c | 1262 | struct inode *inode = foo; |
d8a5ba45 | 1263 | |
a35afb83 | 1264 | inode_init_once(inode); |
d8a5ba45 MS |
1265 | } |
1266 | ||
1267 | static int __init fuse_fs_init(void) | |
1268 | { | |
1269 | int err; | |
1270 | ||
d6392f87 | 1271 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
5d097056 VD |
1272 | sizeof(struct fuse_inode), 0, |
1273 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, | |
20c2df83 | 1274 | fuse_inode_init_once); |
d6392f87 MS |
1275 | err = -ENOMEM; |
1276 | if (!fuse_inode_cachep) | |
988f0325 AV |
1277 | goto out; |
1278 | ||
1279 | err = register_fuseblk(); | |
1280 | if (err) | |
1281 | goto out2; | |
1282 | ||
1283 | err = register_filesystem(&fuse_fs_type); | |
1284 | if (err) | |
1285 | goto out3; | |
d6392f87 MS |
1286 | |
1287 | return 0; | |
d8a5ba45 | 1288 | |
988f0325 | 1289 | out3: |
875d95ec | 1290 | unregister_fuseblk(); |
988f0325 AV |
1291 | out2: |
1292 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1293 | out: |
d8a5ba45 MS |
1294 | return err; |
1295 | } | |
1296 | ||
1297 | static void fuse_fs_cleanup(void) | |
1298 | { | |
1299 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1300 | unregister_fuseblk(); |
8c0a8537 KS |
1301 | |
1302 | /* | |
1303 | * Make sure all delayed rcu free inodes are flushed before we | |
1304 | * destroy cache. | |
1305 | */ | |
1306 | rcu_barrier(); | |
d8a5ba45 MS |
1307 | kmem_cache_destroy(fuse_inode_cachep); |
1308 | } | |
1309 | ||
5c89e17e | 1310 | static struct kobject *fuse_kobj; |
5c89e17e | 1311 | |
f543f253 MS |
1312 | static int fuse_sysfs_init(void) |
1313 | { | |
1314 | int err; | |
1315 | ||
00d26666 | 1316 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1317 | if (!fuse_kobj) { |
1318 | err = -ENOMEM; | |
f543f253 | 1319 | goto out_err; |
5c89e17e | 1320 | } |
f543f253 | 1321 | |
f9bb4882 EB |
1322 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1323 | if (err) | |
f543f253 MS |
1324 | goto out_fuse_unregister; |
1325 | ||
1326 | return 0; | |
1327 | ||
1328 | out_fuse_unregister: | |
197b12d6 | 1329 | kobject_put(fuse_kobj); |
f543f253 MS |
1330 | out_err: |
1331 | return err; | |
1332 | } | |
1333 | ||
1334 | static void fuse_sysfs_cleanup(void) | |
1335 | { | |
f9bb4882 | 1336 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1337 | kobject_put(fuse_kobj); |
f543f253 MS |
1338 | } |
1339 | ||
d8a5ba45 MS |
1340 | static int __init fuse_init(void) |
1341 | { | |
1342 | int res; | |
1343 | ||
1729a16c | 1344 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
d8a5ba45 MS |
1345 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1346 | ||
bafa9654 | 1347 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1348 | res = fuse_fs_init(); |
1349 | if (res) | |
1350 | goto err; | |
1351 | ||
334f485d MS |
1352 | res = fuse_dev_init(); |
1353 | if (res) | |
1354 | goto err_fs_cleanup; | |
1355 | ||
f543f253 MS |
1356 | res = fuse_sysfs_init(); |
1357 | if (res) | |
1358 | goto err_dev_cleanup; | |
1359 | ||
bafa9654 MS |
1360 | res = fuse_ctl_init(); |
1361 | if (res) | |
1362 | goto err_sysfs_cleanup; | |
1363 | ||
487ea5af CH |
1364 | sanitize_global_limit(&max_user_bgreq); |
1365 | sanitize_global_limit(&max_user_congthresh); | |
1366 | ||
d8a5ba45 MS |
1367 | return 0; |
1368 | ||
bafa9654 MS |
1369 | err_sysfs_cleanup: |
1370 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1371 | err_dev_cleanup: |
1372 | fuse_dev_cleanup(); | |
334f485d MS |
1373 | err_fs_cleanup: |
1374 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1375 | err: |
1376 | return res; | |
1377 | } | |
1378 | ||
1379 | static void __exit fuse_exit(void) | |
1380 | { | |
1381 | printk(KERN_DEBUG "fuse exit\n"); | |
1382 | ||
bafa9654 | 1383 | fuse_ctl_cleanup(); |
f543f253 | 1384 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1385 | fuse_fs_cleanup(); |
334f485d | 1386 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1387 | } |
1388 | ||
1389 | module_init(fuse_init); | |
1390 | module_exit(fuse_exit); |