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> |
c30da2e9 DH |
18 | #include <linux/fs_context.h> |
19 | #include <linux/fs_parser.h> | |
d8a5ba45 | 20 | #include <linux/statfs.h> |
9c8ef561 | 21 | #include <linux/random.h> |
e8edc6e0 | 22 | #include <linux/sched.h> |
dbd561d2 | 23 | #include <linux/exportfs.h> |
60bcc88a | 24 | #include <linux/posix_acl.h> |
0b6e9ea0 | 25 | #include <linux/pid_namespace.h> |
d8a5ba45 MS |
26 | |
27 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); | |
28 | MODULE_DESCRIPTION("Filesystem in Userspace"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
e18b890b | 31 | static struct kmem_cache *fuse_inode_cachep; |
bafa9654 MS |
32 | struct list_head fuse_conn_list; |
33 | DEFINE_MUTEX(fuse_mutex); | |
d8a5ba45 | 34 | |
e4dca7b7 | 35 | static int set_global_limit(const char *val, const struct kernel_param *kp); |
487ea5af | 36 | |
79a9d994 | 37 | unsigned max_user_bgreq; |
487ea5af CH |
38 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
39 | &max_user_bgreq, 0644); | |
40 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); | |
41 | MODULE_PARM_DESC(max_user_bgreq, | |
42 | "Global limit for the maximum number of backgrounded requests an " | |
43 | "unprivileged user can set"); | |
44 | ||
79a9d994 | 45 | unsigned max_user_congthresh; |
487ea5af CH |
46 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
47 | &max_user_congthresh, 0644); | |
48 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); | |
49 | MODULE_PARM_DESC(max_user_congthresh, | |
50 | "Global limit for the maximum congestion threshold an " | |
51 | "unprivileged user can set"); | |
52 | ||
d8a5ba45 MS |
53 | #define FUSE_SUPER_MAGIC 0x65735546 |
54 | ||
d1875dba MS |
55 | #define FUSE_DEFAULT_BLKSIZE 512 |
56 | ||
7a6d3c8b CH |
57 | /** Maximum number of outstanding background requests */ |
58 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 | |
59 | ||
60 | /** Congestion starts at 75% of maximum */ | |
61 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) | |
62 | ||
c30da2e9 DH |
63 | #ifdef CONFIG_BLOCK |
64 | static struct file_system_type fuseblk_fs_type; | |
65 | #endif | |
66 | ||
a2daff68 | 67 | struct fuse_forget_link *fuse_alloc_forget(void) |
07e77dca MS |
68 | { |
69 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); | |
70 | } | |
71 | ||
d8a5ba45 MS |
72 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
73 | { | |
d8a5ba45 MS |
74 | struct fuse_inode *fi; |
75 | ||
9031a69c | 76 | fi = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
77 | if (!fi) | |
d8a5ba45 MS |
78 | return NULL; |
79 | ||
0a0898cf | 80 | fi->i_time = 0; |
2f1e8196 | 81 | fi->inval_mask = 0; |
d8a5ba45 | 82 | fi->nodeid = 0; |
9e6268db | 83 | fi->nlookup = 0; |
fbee36b9 | 84 | fi->attr_version = 0; |
45c72cd7 | 85 | fi->orig_ino = 0; |
4582a4ab | 86 | fi->state = 0; |
5c672ab3 | 87 | mutex_init(&fi->mutex); |
f15ecfef | 88 | spin_lock_init(&fi->lock); |
07e77dca MS |
89 | fi->forget = fuse_alloc_forget(); |
90 | if (!fi->forget) { | |
9031a69c | 91 | kmem_cache_free(fuse_inode_cachep, fi); |
e5e5558e MS |
92 | return NULL; |
93 | } | |
d8a5ba45 | 94 | |
9031a69c | 95 | return &fi->inode; |
d8a5ba45 MS |
96 | } |
97 | ||
9baf28bb | 98 | static void fuse_free_inode(struct inode *inode) |
d8a5ba45 | 99 | { |
e5e5558e | 100 | struct fuse_inode *fi = get_fuse_inode(inode); |
9baf28bb | 101 | |
5c672ab3 | 102 | mutex_destroy(&fi->mutex); |
07e77dca | 103 | kfree(fi->forget); |
9baf28bb | 104 | kmem_cache_free(fuse_inode_cachep, fi); |
d8a5ba45 MS |
105 | } |
106 | ||
b57922d9 | 107 | static void fuse_evict_inode(struct inode *inode) |
d8a5ba45 | 108 | { |
9baf28bb AV |
109 | struct fuse_inode *fi = get_fuse_inode(inode); |
110 | ||
91b0abe3 | 111 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 112 | clear_inode(inode); |
1751e8a6 | 113 | if (inode->i_sb->s_flags & SB_ACTIVE) { |
1e9a4ed9 | 114 | struct fuse_conn *fc = get_fuse_conn(inode); |
07e77dca MS |
115 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
116 | fi->forget = NULL; | |
e5e5558e | 117 | } |
9baf28bb AV |
118 | if (S_ISREG(inode->i_mode) && !is_bad_inode(inode)) { |
119 | WARN_ON(!list_empty(&fi->write_files)); | |
120 | WARN_ON(!list_empty(&fi->queued_writes)); | |
121 | } | |
d8a5ba45 MS |
122 | } |
123 | ||
71421259 MS |
124 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
125 | { | |
02b9984d | 126 | sync_filesystem(sb); |
1751e8a6 | 127 | if (*flags & SB_MANDLOCK) |
71421259 MS |
128 | return -EINVAL; |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
45c72cd7 PS |
133 | /* |
134 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down | |
135 | * so that it will fit. | |
136 | */ | |
137 | static ino_t fuse_squash_ino(u64 ino64) | |
138 | { | |
139 | ino_t ino = (ino_t) ino64; | |
140 | if (sizeof(ino_t) < sizeof(u64)) | |
141 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; | |
142 | return ino; | |
143 | } | |
144 | ||
3be5a52b MS |
145 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
146 | u64 attr_valid) | |
d8a5ba45 | 147 | { |
9ffbb916 | 148 | struct fuse_conn *fc = get_fuse_conn(inode); |
ebc14c4d | 149 | struct fuse_inode *fi = get_fuse_inode(inode); |
d8a5ba45 | 150 | |
f15ecfef KT |
151 | lockdep_assert_held(&fi->lock); |
152 | ||
4510d86f | 153 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
1fb69e78 | 154 | fi->i_time = attr_valid; |
2f1e8196 | 155 | WRITE_ONCE(fi->inval_mask, 0); |
1fb69e78 | 156 | |
45c72cd7 | 157 | inode->i_ino = fuse_squash_ino(attr->ino); |
ebc14c4d | 158 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
bfe86848 | 159 | set_nlink(inode, attr->nlink); |
8cb08329 EB |
160 | inode->i_uid = make_kuid(fc->user_ns, attr->uid); |
161 | inode->i_gid = make_kgid(fc->user_ns, attr->gid); | |
d8a5ba45 MS |
162 | inode->i_blocks = attr->blocks; |
163 | inode->i_atime.tv_sec = attr->atime; | |
164 | inode->i_atime.tv_nsec = attr->atimensec; | |
b0aa7606 MP |
165 | /* mtime from server may be stale due to local buffered write */ |
166 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { | |
167 | inode->i_mtime.tv_sec = attr->mtime; | |
168 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
169 | inode->i_ctime.tv_sec = attr->ctime; |
170 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
b0aa7606 | 171 | } |
e00d2c2d | 172 | |
0e9663ee MS |
173 | if (attr->blksize != 0) |
174 | inode->i_blkbits = ilog2(attr->blksize); | |
175 | else | |
176 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; | |
177 | ||
ebc14c4d MS |
178 | /* |
179 | * Don't set the sticky bit in i_mode, unless we want the VFS | |
180 | * to check permissions. This prevents failures due to the | |
181 | * check in may_delete(). | |
182 | */ | |
183 | fi->orig_i_mode = inode->i_mode; | |
29433a29 | 184 | if (!fc->default_permissions) |
ebc14c4d | 185 | inode->i_mode &= ~S_ISVTX; |
45c72cd7 PS |
186 | |
187 | fi->orig_ino = attr->ino; | |
3be5a52b MS |
188 | } |
189 | ||
190 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, | |
191 | u64 attr_valid, u64 attr_version) | |
192 | { | |
193 | struct fuse_conn *fc = get_fuse_conn(inode); | |
194 | struct fuse_inode *fi = get_fuse_inode(inode); | |
8373200b | 195 | bool is_wb = fc->writeback_cache; |
3be5a52b | 196 | loff_t oldsize; |
a64ba10f | 197 | struct timespec64 old_mtime; |
3be5a52b | 198 | |
f15ecfef | 199 | spin_lock(&fi->lock); |
06a7c3c2 MP |
200 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
201 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
f15ecfef | 202 | spin_unlock(&fi->lock); |
3be5a52b MS |
203 | return; |
204 | } | |
205 | ||
a64ba10f | 206 | old_mtime = inode->i_mtime; |
3be5a52b | 207 | fuse_change_attributes_common(inode, attr, attr_valid); |
ebc14c4d | 208 | |
e00d2c2d | 209 | oldsize = inode->i_size; |
8373200b PE |
210 | /* |
211 | * In case of writeback_cache enabled, the cached writes beyond EOF | |
212 | * extend local i_size without keeping userspace server in sync. So, | |
213 | * attr->size coming from server can be stale. We cannot trust it. | |
214 | */ | |
215 | if (!is_wb || !S_ISREG(inode->i_mode)) | |
216 | i_size_write(inode, attr->size); | |
f15ecfef | 217 | spin_unlock(&fi->lock); |
e00d2c2d | 218 | |
8373200b | 219 | if (!is_wb && S_ISREG(inode->i_mode)) { |
eed2179e BF |
220 | bool inval = false; |
221 | ||
222 | if (oldsize != attr->size) { | |
7caef267 | 223 | truncate_pagecache(inode, attr->size); |
ad2ba64d KS |
224 | if (!fc->explicit_inval_data) |
225 | inval = true; | |
eed2179e | 226 | } else if (fc->auto_inval_data) { |
a64ba10f | 227 | struct timespec64 new_mtime = { |
eed2179e BF |
228 | .tv_sec = attr->mtime, |
229 | .tv_nsec = attr->mtimensec, | |
230 | }; | |
231 | ||
232 | /* | |
233 | * Auto inval mode also checks and invalidates if mtime | |
234 | * has changed. | |
235 | */ | |
a64ba10f | 236 | if (!timespec64_equal(&old_mtime, &new_mtime)) |
eed2179e BF |
237 | inval = true; |
238 | } | |
239 | ||
240 | if (inval) | |
241 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d | 242 | } |
d8a5ba45 MS |
243 | } |
244 | ||
245 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) | |
246 | { | |
247 | inode->i_mode = attr->mode & S_IFMT; | |
9ffbb916 | 248 | inode->i_size = attr->size; |
b0aa7606 MP |
249 | inode->i_mtime.tv_sec = attr->mtime; |
250 | inode->i_mtime.tv_nsec = attr->mtimensec; | |
31f3267b MP |
251 | inode->i_ctime.tv_sec = attr->ctime; |
252 | inode->i_ctime.tv_nsec = attr->ctimensec; | |
e5e5558e MS |
253 | if (S_ISREG(inode->i_mode)) { |
254 | fuse_init_common(inode); | |
b6aeaded | 255 | fuse_init_file_inode(inode); |
e5e5558e MS |
256 | } else if (S_ISDIR(inode->i_mode)) |
257 | fuse_init_dir(inode); | |
258 | else if (S_ISLNK(inode->i_mode)) | |
259 | fuse_init_symlink(inode); | |
260 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || | |
261 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
262 | fuse_init_common(inode); | |
263 | init_special_inode(inode, inode->i_mode, | |
264 | new_decode_dev(attr->rdev)); | |
39ee059a MS |
265 | } else |
266 | BUG(); | |
d8a5ba45 MS |
267 | } |
268 | ||
3b463ae0 | 269 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
d8a5ba45 | 270 | { |
b48badf0 | 271 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
272 | if (get_node_id(inode) == nodeid) |
273 | return 1; | |
274 | else | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) | |
279 | { | |
b48badf0 | 280 | u64 nodeid = *(u64 *) _nodeidp; |
d8a5ba45 MS |
281 | get_fuse_inode(inode)->nodeid = nodeid; |
282 | return 0; | |
283 | } | |
284 | ||
b48badf0 | 285 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
286 | int generation, struct fuse_attr *attr, |
287 | u64 attr_valid, u64 attr_version) | |
d8a5ba45 MS |
288 | { |
289 | struct inode *inode; | |
9e6268db | 290 | struct fuse_inode *fi; |
d8a5ba45 | 291 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 MS |
292 | |
293 | retry: | |
294 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); | |
295 | if (!inode) | |
296 | return NULL; | |
297 | ||
298 | if ((inode->i_state & I_NEW)) { | |
b0aa7606 | 299 | inode->i_flags |= S_NOATIME; |
d31433c8 | 300 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
b0aa7606 | 301 | inode->i_flags |= S_NOCMTIME; |
d8a5ba45 | 302 | inode->i_generation = generation; |
d8a5ba45 MS |
303 | fuse_init_inode(inode, attr); |
304 | unlock_new_inode(inode); | |
305 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { | |
d8a5ba45 MS |
306 | /* Inode has changed type, any I/O on the old should fail */ |
307 | make_bad_inode(inode); | |
308 | iput(inode); | |
d8a5ba45 MS |
309 | goto retry; |
310 | } | |
311 | ||
9e6268db | 312 | fi = get_fuse_inode(inode); |
c9d8f5f0 | 313 | spin_lock(&fi->lock); |
1729a16c | 314 | fi->nlookup++; |
c9d8f5f0 | 315 | spin_unlock(&fi->lock); |
1fb69e78 MS |
316 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
317 | ||
d8a5ba45 MS |
318 | return inode; |
319 | } | |
320 | ||
3b463ae0 JM |
321 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
322 | loff_t offset, loff_t len) | |
323 | { | |
324 | struct inode *inode; | |
325 | pgoff_t pg_start; | |
326 | pgoff_t pg_end; | |
327 | ||
328 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); | |
329 | if (!inode) | |
330 | return -ENOENT; | |
331 | ||
332 | fuse_invalidate_attr(inode); | |
60bcc88a | 333 | forget_all_cached_acls(inode); |
3b463ae0 | 334 | if (offset >= 0) { |
09cbfeaf | 335 | pg_start = offset >> PAGE_SHIFT; |
3b463ae0 JM |
336 | if (len <= 0) |
337 | pg_end = -1; | |
338 | else | |
09cbfeaf | 339 | pg_end = (offset + len - 1) >> PAGE_SHIFT; |
3b463ae0 JM |
340 | invalidate_inode_pages2_range(inode->i_mapping, |
341 | pg_start, pg_end); | |
342 | } | |
343 | iput(inode); | |
344 | return 0; | |
345 | } | |
346 | ||
63576c13 | 347 | bool fuse_lock_inode(struct inode *inode) |
5c672ab3 | 348 | { |
63576c13 MS |
349 | bool locked = false; |
350 | ||
351 | if (!get_fuse_conn(inode)->parallel_dirops) { | |
5c672ab3 | 352 | mutex_lock(&get_fuse_inode(inode)->mutex); |
63576c13 MS |
353 | locked = true; |
354 | } | |
355 | ||
356 | return locked; | |
5c672ab3 MS |
357 | } |
358 | ||
63576c13 | 359 | void fuse_unlock_inode(struct inode *inode, bool locked) |
5c672ab3 | 360 | { |
63576c13 | 361 | if (locked) |
5c672ab3 MS |
362 | mutex_unlock(&get_fuse_inode(inode)->mutex); |
363 | } | |
364 | ||
42faad99 | 365 | static void fuse_umount_begin(struct super_block *sb) |
69a53bf2 | 366 | { |
eb98e3bd | 367 | fuse_abort_conn(get_fuse_conn_super(sb)); |
69a53bf2 MS |
368 | } |
369 | ||
0ec7ca41 MS |
370 | static void fuse_send_destroy(struct fuse_conn *fc) |
371 | { | |
1ccd1ea2 MS |
372 | if (fc->conn_init) { |
373 | FUSE_ARGS(args); | |
374 | ||
375 | args.opcode = FUSE_DESTROY; | |
376 | args.force = true; | |
377 | args.nocreds = true; | |
378 | fuse_simple_request(fc, &args); | |
0ec7ca41 MS |
379 | } |
380 | } | |
381 | ||
a325f9b9 TH |
382 | static void fuse_put_super(struct super_block *sb) |
383 | { | |
384 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
385 | ||
bbd99797 MS |
386 | mutex_lock(&fuse_mutex); |
387 | list_del(&fc->entry); | |
388 | fuse_ctl_remove_conn(fc); | |
389 | mutex_unlock(&fuse_mutex); | |
bbd99797 | 390 | |
bafa9654 | 391 | fuse_conn_put(fc); |
d8a5ba45 MS |
392 | } |
393 | ||
e5e5558e MS |
394 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
395 | { | |
396 | stbuf->f_type = FUSE_SUPER_MAGIC; | |
397 | stbuf->f_bsize = attr->bsize; | |
de5f1202 | 398 | stbuf->f_frsize = attr->frsize; |
e5e5558e MS |
399 | stbuf->f_blocks = attr->blocks; |
400 | stbuf->f_bfree = attr->bfree; | |
401 | stbuf->f_bavail = attr->bavail; | |
402 | stbuf->f_files = attr->files; | |
403 | stbuf->f_ffree = attr->ffree; | |
404 | stbuf->f_namelen = attr->namelen; | |
405 | /* fsid is left zero */ | |
406 | } | |
407 | ||
726c3342 | 408 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
e5e5558e | 409 | { |
726c3342 | 410 | struct super_block *sb = dentry->d_sb; |
e5e5558e | 411 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 412 | FUSE_ARGS(args); |
e5e5558e MS |
413 | struct fuse_statfs_out outarg; |
414 | int err; | |
415 | ||
c2132c1b | 416 | if (!fuse_allow_current_process(fc)) { |
e57ac683 MS |
417 | buf->f_type = FUSE_SUPER_MAGIC; |
418 | return 0; | |
419 | } | |
420 | ||
de5f1202 | 421 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
422 | args.in_numargs = 0; |
423 | args.opcode = FUSE_STATFS; | |
424 | args.nodeid = get_node_id(d_inode(dentry)); | |
425 | args.out_numargs = 1; | |
426 | args.out_args[0].size = sizeof(outarg); | |
427 | args.out_args[0].value = &outarg; | |
7078187a | 428 | err = fuse_simple_request(fc, &args); |
e5e5558e MS |
429 | if (!err) |
430 | convert_fuse_statfs(buf, &outarg.st); | |
e5e5558e MS |
431 | return err; |
432 | } | |
433 | ||
d8a5ba45 | 434 | enum { |
c30da2e9 DH |
435 | OPT_SOURCE, |
436 | OPT_SUBTYPE, | |
d8a5ba45 MS |
437 | OPT_FD, |
438 | OPT_ROOTMODE, | |
439 | OPT_USER_ID, | |
87729a55 | 440 | OPT_GROUP_ID, |
d8a5ba45 MS |
441 | OPT_DEFAULT_PERMISSIONS, |
442 | OPT_ALLOW_OTHER, | |
db50b96c | 443 | OPT_MAX_READ, |
d8091614 | 444 | OPT_BLKSIZE, |
d8a5ba45 MS |
445 | OPT_ERR |
446 | }; | |
447 | ||
c30da2e9 DH |
448 | static const struct fs_parameter_spec fuse_param_specs[] = { |
449 | fsparam_string ("source", OPT_SOURCE), | |
450 | fsparam_u32 ("fd", OPT_FD), | |
451 | fsparam_u32oct ("rootmode", OPT_ROOTMODE), | |
452 | fsparam_u32 ("user_id", OPT_USER_ID), | |
453 | fsparam_u32 ("group_id", OPT_GROUP_ID), | |
454 | fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS), | |
455 | fsparam_flag ("allow_other", OPT_ALLOW_OTHER), | |
456 | fsparam_u32 ("max_read", OPT_MAX_READ), | |
457 | fsparam_u32 ("blksize", OPT_BLKSIZE), | |
c7eb6869 | 458 | fsparam_string ("subtype", OPT_SUBTYPE), |
c30da2e9 DH |
459 | {} |
460 | }; | |
461 | ||
462 | static const struct fs_parameter_description fuse_fs_parameters = { | |
463 | .name = "fuse", | |
464 | .specs = fuse_param_specs, | |
d8a5ba45 MS |
465 | }; |
466 | ||
c30da2e9 | 467 | static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param) |
233a01fa | 468 | { |
c30da2e9 DH |
469 | struct fs_parse_result result; |
470 | struct fuse_fs_context *ctx = fc->fs_private; | |
471 | int opt; | |
472 | ||
473 | opt = fs_parse(fc, &fuse_fs_parameters, param, &result); | |
474 | if (opt < 0) | |
475 | return opt; | |
476 | ||
477 | switch (opt) { | |
478 | case OPT_SOURCE: | |
479 | if (fc->source) | |
480 | return invalf(fc, "fuse: Multiple sources specified"); | |
481 | fc->source = param->string; | |
482 | param->string = NULL; | |
483 | break; | |
484 | ||
485 | case OPT_SUBTYPE: | |
486 | if (ctx->subtype) | |
487 | return invalf(fc, "fuse: Multiple subtypes specified"); | |
488 | ctx->subtype = param->string; | |
489 | param->string = NULL; | |
490 | return 0; | |
491 | ||
492 | case OPT_FD: | |
493 | ctx->fd = result.uint_32; | |
494 | ctx->fd_present = 1; | |
495 | break; | |
496 | ||
497 | case OPT_ROOTMODE: | |
498 | if (!fuse_valid_type(result.uint_32)) | |
499 | return invalf(fc, "fuse: Invalid rootmode"); | |
500 | ctx->rootmode = result.uint_32; | |
501 | ctx->rootmode_present = 1; | |
502 | break; | |
503 | ||
504 | case OPT_USER_ID: | |
505 | ctx->user_id = make_kuid(fc->user_ns, result.uint_32); | |
506 | if (!uid_valid(ctx->user_id)) | |
507 | return invalf(fc, "fuse: Invalid user_id"); | |
508 | ctx->user_id_present = 1; | |
509 | break; | |
510 | ||
511 | case OPT_GROUP_ID: | |
512 | ctx->group_id = make_kgid(fc->user_ns, result.uint_32); | |
513 | if (!gid_valid(ctx->group_id)) | |
514 | return invalf(fc, "fuse: Invalid group_id"); | |
515 | ctx->group_id_present = 1; | |
516 | break; | |
517 | ||
518 | case OPT_DEFAULT_PERMISSIONS: | |
519 | ctx->default_permissions = 1; | |
520 | break; | |
521 | ||
522 | case OPT_ALLOW_OTHER: | |
523 | ctx->allow_other = 1; | |
524 | break; | |
525 | ||
526 | case OPT_MAX_READ: | |
527 | ctx->max_read = result.uint_32; | |
528 | break; | |
529 | ||
530 | case OPT_BLKSIZE: | |
531 | if (!ctx->is_bdev) | |
532 | return invalf(fc, "fuse: blksize only supported for fuseblk"); | |
533 | ctx->blksize = result.uint_32; | |
534 | break; | |
535 | ||
536 | default: | |
537 | return -EINVAL; | |
233a01fa | 538 | } |
c30da2e9 DH |
539 | |
540 | return 0; | |
233a01fa MS |
541 | } |
542 | ||
c30da2e9 | 543 | static void fuse_free_fc(struct fs_context *fc) |
d8a5ba45 | 544 | { |
c30da2e9 | 545 | struct fuse_fs_context *ctx = fc->fs_private; |
5a533682 | 546 | |
c30da2e9 DH |
547 | if (ctx) { |
548 | kfree(ctx->subtype); | |
549 | kfree(ctx); | |
550 | } | |
d8a5ba45 MS |
551 | } |
552 | ||
34c80b1d | 553 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
d8a5ba45 | 554 | { |
34c80b1d AV |
555 | struct super_block *sb = root->d_sb; |
556 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
d8a5ba45 | 557 | |
8cb08329 EB |
558 | seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id)); |
559 | seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id)); | |
29433a29 | 560 | if (fc->default_permissions) |
1e9a4ed9 | 561 | seq_puts(m, ",default_permissions"); |
29433a29 | 562 | if (fc->allow_other) |
1e9a4ed9 | 563 | seq_puts(m, ",allow_other"); |
db50b96c MS |
564 | if (fc->max_read != ~0) |
565 | seq_printf(m, ",max_read=%u", fc->max_read); | |
34c80b1d AV |
566 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
567 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); | |
d8a5ba45 MS |
568 | return 0; |
569 | } | |
570 | ||
ae3aad77 SH |
571 | static void fuse_iqueue_init(struct fuse_iqueue *fiq, |
572 | const struct fuse_iqueue_ops *ops, | |
573 | void *priv) | |
f88996a9 MS |
574 | { |
575 | memset(fiq, 0, sizeof(struct fuse_iqueue)); | |
76e43c8c | 576 | spin_lock_init(&fiq->lock); |
f88996a9 MS |
577 | init_waitqueue_head(&fiq->waitq); |
578 | INIT_LIST_HEAD(&fiq->pending); | |
579 | INIT_LIST_HEAD(&fiq->interrupts); | |
580 | fiq->forget_list_tail = &fiq->forget_list_head; | |
e16714d8 | 581 | fiq->connected = 1; |
ae3aad77 SH |
582 | fiq->ops = ops; |
583 | fiq->priv = priv; | |
f88996a9 MS |
584 | } |
585 | ||
3a2b5b9c MS |
586 | static void fuse_pqueue_init(struct fuse_pqueue *fpq) |
587 | { | |
be2ff42c KT |
588 | unsigned int i; |
589 | ||
45a91cb1 | 590 | spin_lock_init(&fpq->lock); |
be2ff42c KT |
591 | for (i = 0; i < FUSE_PQ_HASH_SIZE; i++) |
592 | INIT_LIST_HEAD(&fpq->processing[i]); | |
3a2b5b9c | 593 | INIT_LIST_HEAD(&fpq->io); |
e96edd94 | 594 | fpq->connected = 1; |
3a2b5b9c MS |
595 | } |
596 | ||
ae3aad77 SH |
597 | void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns, |
598 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) | |
d8a5ba45 | 599 | { |
0d179aa5 TH |
600 | memset(fc, 0, sizeof(*fc)); |
601 | spin_lock_init(&fc->lock); | |
ae2dffa3 | 602 | spin_lock_init(&fc->bg_lock); |
3b463ae0 | 603 | init_rwsem(&fc->killsb); |
095fc40a | 604 | refcount_set(&fc->count, 1); |
c3696046 | 605 | atomic_set(&fc->dev_count, 1); |
0d179aa5 | 606 | init_waitqueue_head(&fc->blocked_waitq); |
ae3aad77 | 607 | fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv); |
0d179aa5 TH |
608 | INIT_LIST_HEAD(&fc->bg_queue); |
609 | INIT_LIST_HEAD(&fc->entry); | |
cc080e9e | 610 | INIT_LIST_HEAD(&fc->devices); |
0d179aa5 | 611 | atomic_set(&fc->num_waiting, 0); |
7a6d3c8b CH |
612 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
613 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; | |
75126f55 | 614 | atomic64_set(&fc->khctr, 0); |
0d179aa5 | 615 | fc->polled_files = RB_ROOT; |
0aada884 | 616 | fc->blocked = 0; |
796523fb | 617 | fc->initialized = 0; |
e16714d8 | 618 | fc->connected = 1; |
4510d86f | 619 | atomic64_set(&fc->attr_version, 1); |
0d179aa5 | 620 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
0b6e9ea0 | 621 | fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); |
8cb08329 | 622 | fc->user_ns = get_user_ns(user_ns); |
8a3177db | 623 | fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; |
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)) { |
0b6e9ea0 | 630 | put_pid_ns(fc->pid_ns); |
8cb08329 | 631 | put_user_ns(fc->user_ns); |
43901aab | 632 | fc->release(fc); |
d2a85164 | 633 | } |
bafa9654 | 634 | } |
08cbf542 | 635 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
bafa9654 MS |
636 | |
637 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) | |
638 | { | |
095fc40a | 639 | refcount_inc(&fc->count); |
bafa9654 MS |
640 | return fc; |
641 | } | |
08cbf542 | 642 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
bafa9654 | 643 | |
b93f858a | 644 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
d8a5ba45 MS |
645 | { |
646 | struct fuse_attr attr; | |
647 | memset(&attr, 0, sizeof(attr)); | |
648 | ||
649 | attr.mode = mode; | |
650 | attr.ino = FUSE_ROOT_ID; | |
074406fa | 651 | attr.nlink = 1; |
1fb69e78 | 652 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
d8a5ba45 MS |
653 | } |
654 | ||
1729a16c | 655 | struct fuse_inode_handle { |
dbd561d2 MS |
656 | u64 nodeid; |
657 | u32 generation; | |
658 | }; | |
659 | ||
660 | static struct dentry *fuse_get_dentry(struct super_block *sb, | |
661 | struct fuse_inode_handle *handle) | |
662 | { | |
33670fa2 | 663 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
dbd561d2 MS |
664 | struct inode *inode; |
665 | struct dentry *entry; | |
666 | int err = -ESTALE; | |
667 | ||
668 | if (handle->nodeid == 0) | |
669 | goto out_err; | |
670 | ||
671 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); | |
33670fa2 MS |
672 | if (!inode) { |
673 | struct fuse_entry_out outarg; | |
13983d06 | 674 | const struct qstr name = QSTR_INIT(".", 1); |
33670fa2 MS |
675 | |
676 | if (!fc->export_support) | |
677 | goto out_err; | |
678 | ||
33670fa2 MS |
679 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
680 | &inode); | |
681 | if (err && err != -ENOENT) | |
682 | goto out_err; | |
683 | if (err || !inode) { | |
684 | err = -ESTALE; | |
685 | goto out_err; | |
686 | } | |
687 | err = -EIO; | |
688 | if (get_node_id(inode) != handle->nodeid) | |
689 | goto out_iput; | |
690 | } | |
dbd561d2 MS |
691 | err = -ESTALE; |
692 | if (inode->i_generation != handle->generation) | |
693 | goto out_iput; | |
694 | ||
44003728 | 695 | entry = d_obtain_alias(inode); |
c35eebe9 | 696 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
dbd561d2 | 697 | fuse_invalidate_entry_cache(entry); |
dbd561d2 MS |
698 | |
699 | return entry; | |
700 | ||
701 | out_iput: | |
702 | iput(inode); | |
703 | out_err: | |
704 | return ERR_PTR(err); | |
705 | } | |
706 | ||
b0b0382b AV |
707 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
708 | struct inode *parent) | |
dbd561d2 | 709 | { |
b0b0382b | 710 | int len = parent ? 6 : 3; |
dbd561d2 MS |
711 | u64 nodeid; |
712 | u32 generation; | |
713 | ||
5fe0c237 AK |
714 | if (*max_len < len) { |
715 | *max_len = len; | |
94e07a75 | 716 | return FILEID_INVALID; |
5fe0c237 | 717 | } |
dbd561d2 MS |
718 | |
719 | nodeid = get_fuse_inode(inode)->nodeid; | |
720 | generation = inode->i_generation; | |
721 | ||
722 | fh[0] = (u32)(nodeid >> 32); | |
723 | fh[1] = (u32)(nodeid & 0xffffffff); | |
724 | fh[2] = generation; | |
725 | ||
b0b0382b | 726 | if (parent) { |
dbd561d2 MS |
727 | nodeid = get_fuse_inode(parent)->nodeid; |
728 | generation = parent->i_generation; | |
dbd561d2 MS |
729 | |
730 | fh[3] = (u32)(nodeid >> 32); | |
731 | fh[4] = (u32)(nodeid & 0xffffffff); | |
732 | fh[5] = generation; | |
733 | } | |
734 | ||
735 | *max_len = len; | |
b0b0382b | 736 | return parent ? 0x82 : 0x81; |
dbd561d2 MS |
737 | } |
738 | ||
739 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, | |
740 | struct fid *fid, int fh_len, int fh_type) | |
741 | { | |
742 | struct fuse_inode_handle handle; | |
743 | ||
744 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) | |
745 | return NULL; | |
746 | ||
747 | handle.nodeid = (u64) fid->raw[0] << 32; | |
748 | handle.nodeid |= (u64) fid->raw[1]; | |
749 | handle.generation = fid->raw[2]; | |
750 | return fuse_get_dentry(sb, &handle); | |
751 | } | |
752 | ||
753 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, | |
754 | struct fid *fid, int fh_len, int fh_type) | |
755 | { | |
756 | struct fuse_inode_handle parent; | |
757 | ||
758 | if (fh_type != 0x82 || fh_len < 6) | |
759 | return NULL; | |
760 | ||
761 | parent.nodeid = (u64) fid->raw[3] << 32; | |
762 | parent.nodeid |= (u64) fid->raw[4]; | |
763 | parent.generation = fid->raw[5]; | |
764 | return fuse_get_dentry(sb, &parent); | |
765 | } | |
766 | ||
33670fa2 MS |
767 | static struct dentry *fuse_get_parent(struct dentry *child) |
768 | { | |
2b0143b5 | 769 | struct inode *child_inode = d_inode(child); |
33670fa2 MS |
770 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
771 | struct inode *inode; | |
772 | struct dentry *parent; | |
773 | struct fuse_entry_out outarg; | |
13983d06 | 774 | const struct qstr name = QSTR_INIT("..", 2); |
33670fa2 MS |
775 | int err; |
776 | ||
777 | if (!fc->export_support) | |
778 | return ERR_PTR(-ESTALE); | |
779 | ||
33670fa2 MS |
780 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
781 | &name, &outarg, &inode); | |
44003728 CH |
782 | if (err) { |
783 | if (err == -ENOENT) | |
784 | return ERR_PTR(-ESTALE); | |
33670fa2 | 785 | return ERR_PTR(err); |
33670fa2 | 786 | } |
44003728 CH |
787 | |
788 | parent = d_obtain_alias(inode); | |
c35eebe9 | 789 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
33670fa2 | 790 | fuse_invalidate_entry_cache(parent); |
33670fa2 MS |
791 | |
792 | return parent; | |
793 | } | |
dbd561d2 MS |
794 | |
795 | static const struct export_operations fuse_export_operations = { | |
796 | .fh_to_dentry = fuse_fh_to_dentry, | |
797 | .fh_to_parent = fuse_fh_to_parent, | |
798 | .encode_fh = fuse_encode_fh, | |
33670fa2 | 799 | .get_parent = fuse_get_parent, |
dbd561d2 MS |
800 | }; |
801 | ||
ee9b6d61 | 802 | static const struct super_operations fuse_super_operations = { |
d8a5ba45 | 803 | .alloc_inode = fuse_alloc_inode, |
9baf28bb | 804 | .free_inode = fuse_free_inode, |
b57922d9 | 805 | .evict_inode = fuse_evict_inode, |
1e18bda8 | 806 | .write_inode = fuse_write_inode, |
ead5f0b5 | 807 | .drop_inode = generic_delete_inode, |
71421259 | 808 | .remount_fs = fuse_remount_fs, |
d8a5ba45 | 809 | .put_super = fuse_put_super, |
69a53bf2 | 810 | .umount_begin = fuse_umount_begin, |
e5e5558e | 811 | .statfs = fuse_statfs, |
d8a5ba45 MS |
812 | .show_options = fuse_show_options, |
813 | }; | |
814 | ||
487ea5af CH |
815 | static void sanitize_global_limit(unsigned *limit) |
816 | { | |
f22f812d MS |
817 | /* |
818 | * The default maximum number of async requests is calculated to consume | |
819 | * 1/2^13 of the total memory, assuming 392 bytes per request. | |
820 | */ | |
487ea5af | 821 | if (*limit == 0) |
f22f812d | 822 | *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392; |
487ea5af CH |
823 | |
824 | if (*limit >= 1 << 16) | |
825 | *limit = (1 << 16) - 1; | |
826 | } | |
827 | ||
e4dca7b7 | 828 | static int set_global_limit(const char *val, const struct kernel_param *kp) |
487ea5af CH |
829 | { |
830 | int rv; | |
831 | ||
832 | rv = param_set_uint(val, kp); | |
833 | if (rv) | |
834 | return rv; | |
835 | ||
836 | sanitize_global_limit((unsigned *)kp->arg); | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) | |
842 | { | |
843 | int cap_sys_admin = capable(CAP_SYS_ADMIN); | |
844 | ||
845 | if (arg->minor < 13) | |
846 | return; | |
847 | ||
848 | sanitize_global_limit(&max_user_bgreq); | |
849 | sanitize_global_limit(&max_user_congthresh); | |
850 | ||
ae2dffa3 | 851 | spin_lock(&fc->bg_lock); |
487ea5af CH |
852 | if (arg->max_background) { |
853 | fc->max_background = arg->max_background; | |
854 | ||
855 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) | |
856 | fc->max_background = max_user_bgreq; | |
857 | } | |
858 | if (arg->congestion_threshold) { | |
859 | fc->congestion_threshold = arg->congestion_threshold; | |
860 | ||
861 | if (!cap_sys_admin && | |
862 | fc->congestion_threshold > max_user_congthresh) | |
863 | fc->congestion_threshold = max_user_congthresh; | |
864 | } | |
ae2dffa3 | 865 | spin_unlock(&fc->bg_lock); |
487ea5af CH |
866 | } |
867 | ||
615047ef MS |
868 | struct fuse_init_args { |
869 | struct fuse_args args; | |
870 | struct fuse_init_in in; | |
871 | struct fuse_init_out out; | |
872 | }; | |
873 | ||
874 | static void process_init_reply(struct fuse_conn *fc, struct fuse_args *args, | |
875 | int error) | |
9b9a0469 | 876 | { |
615047ef MS |
877 | struct fuse_init_args *ia = container_of(args, typeof(*ia), args); |
878 | struct fuse_init_out *arg = &ia->out; | |
9b9a0469 | 879 | |
615047ef | 880 | if (error || arg->major != FUSE_KERNEL_VERSION) |
9b9a0469 MS |
881 | fc->conn_error = 1; |
882 | else { | |
9cd68455 MS |
883 | unsigned long ra_pages; |
884 | ||
487ea5af CH |
885 | process_init_limits(fc, arg); |
886 | ||
9cd68455 | 887 | if (arg->minor >= 6) { |
09cbfeaf | 888 | ra_pages = arg->max_readahead / PAGE_SIZE; |
9cd68455 MS |
889 | if (arg->flags & FUSE_ASYNC_READ) |
890 | fc->async_read = 1; | |
71421259 MS |
891 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
892 | fc->no_lock = 1; | |
37fb3a30 MS |
893 | if (arg->minor >= 17) { |
894 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) | |
895 | fc->no_flock = 1; | |
24114504 MS |
896 | } else { |
897 | if (!(arg->flags & FUSE_POSIX_LOCKS)) | |
898 | fc->no_flock = 1; | |
37fb3a30 | 899 | } |
6ff958ed MS |
900 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
901 | fc->atomic_o_trunc = 1; | |
33670fa2 MS |
902 | if (arg->minor >= 9) { |
903 | /* LOOKUP has dependency on proto version */ | |
904 | if (arg->flags & FUSE_EXPORT_SUPPORT) | |
905 | fc->export_support = 1; | |
906 | } | |
78bb6cb9 MS |
907 | if (arg->flags & FUSE_BIG_WRITES) |
908 | fc->big_writes = 1; | |
e0a43ddc MS |
909 | if (arg->flags & FUSE_DONT_MASK) |
910 | fc->dont_mask = 1; | |
72d0d248 BF |
911 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
912 | fc->auto_inval_data = 1; | |
ad2ba64d KS |
913 | else if (arg->flags & FUSE_EXPLICIT_INVAL_DATA) |
914 | fc->explicit_inval_data = 1; | |
28420dad | 915 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
0b05b183 | 916 | fc->do_readdirplus = 1; |
28420dad MS |
917 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
918 | fc->readdirplus_auto = 1; | |
919 | } | |
60b9df7a MS |
920 | if (arg->flags & FUSE_ASYNC_DIO) |
921 | fc->async_dio = 1; | |
4d99ff8f PE |
922 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
923 | fc->writeback_cache = 1; | |
5c672ab3 MS |
924 | if (arg->flags & FUSE_PARALLEL_DIROPS) |
925 | fc->parallel_dirops = 1; | |
5e940c1d MS |
926 | if (arg->flags & FUSE_HANDLE_KILLPRIV) |
927 | fc->handle_killpriv = 1; | |
e27c9d38 MS |
928 | if (arg->time_gran && arg->time_gran <= 1000000000) |
929 | fc->sb->s_time_gran = arg->time_gran; | |
60bcc88a | 930 | if ((arg->flags & FUSE_POSIX_ACL)) { |
29433a29 | 931 | fc->default_permissions = 1; |
60bcc88a SF |
932 | fc->posix_acl = 1; |
933 | fc->sb->s_xattr = fuse_acl_xattr_handlers; | |
934 | } | |
5571f1e6 DS |
935 | if (arg->flags & FUSE_CACHE_SYMLINKS) |
936 | fc->cache_symlinks = 1; | |
3b7008b2 SL |
937 | if (arg->flags & FUSE_ABORT_ERROR) |
938 | fc->abort_err = 1; | |
5da784cc CS |
939 | if (arg->flags & FUSE_MAX_PAGES) { |
940 | fc->max_pages = | |
941 | min_t(unsigned int, FUSE_MAX_MAX_PAGES, | |
942 | max_t(unsigned int, arg->max_pages, 1)); | |
943 | } | |
71421259 | 944 | } else { |
09cbfeaf | 945 | ra_pages = fc->max_read / PAGE_SIZE; |
71421259 | 946 | fc->no_lock = 1; |
37fb3a30 | 947 | fc->no_flock = 1; |
71421259 | 948 | } |
9cd68455 | 949 | |
5f7f7543 JK |
950 | fc->sb->s_bdi->ra_pages = |
951 | min(fc->sb->s_bdi->ra_pages, ra_pages); | |
9b9a0469 MS |
952 | fc->minor = arg->minor; |
953 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; | |
f948d564 | 954 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
0ec7ca41 | 955 | fc->conn_init = 1; |
9b9a0469 | 956 | } |
615047ef MS |
957 | kfree(ia); |
958 | ||
9759bd51 | 959 | fuse_set_initialized(fc); |
08a53cdc | 960 | wake_up_all(&fc->blocked_waitq); |
9b9a0469 MS |
961 | } |
962 | ||
95a84cdb | 963 | void fuse_send_init(struct fuse_conn *fc) |
9b9a0469 | 964 | { |
615047ef | 965 | struct fuse_init_args *ia; |
095da6cb | 966 | |
615047ef MS |
967 | ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL); |
968 | ||
969 | ia->in.major = FUSE_KERNEL_VERSION; | |
970 | ia->in.minor = FUSE_KERNEL_MINOR_VERSION; | |
971 | ia->in.max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; | |
972 | ia->in.flags |= | |
973 | FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | | |
37fb3a30 | 974 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
69fe05c9 | 975 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
9446385f | 976 | FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
4d99ff8f | 977 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
5c672ab3 | 978 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | |
3b7008b2 | 979 | FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | |
d9a9ea94 | 980 | FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS | |
ad2ba64d | 981 | FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA; |
615047ef MS |
982 | ia->args.opcode = FUSE_INIT; |
983 | ia->args.in_numargs = 1; | |
984 | ia->args.in_args[0].size = sizeof(ia->in); | |
985 | ia->args.in_args[0].value = &ia->in; | |
986 | ia->args.out_numargs = 1; | |
3ad2f3fb | 987 | /* Variable length argument used for backward compatibility |
9b9a0469 MS |
988 | with interface version < 7.5. Rest of init_out is zeroed |
989 | by do_get_request(), so a short reply is not a problem */ | |
615047ef MS |
990 | ia->args.out_argvar = 1; |
991 | ia->args.out_args[0].size = sizeof(ia->out); | |
992 | ia->args.out_args[0].value = &ia->out; | |
993 | ia->args.force = true; | |
994 | ia->args.nocreds = true; | |
995 | ia->args.end = process_init_reply; | |
996 | ||
997 | if (fuse_simple_background(fc, &ia->args, GFP_KERNEL) != 0) | |
998 | process_init_reply(fc, &ia->args, -ENOTCONN); | |
9b9a0469 | 999 | } |
95a84cdb | 1000 | EXPORT_SYMBOL_GPL(fuse_send_init); |
9b9a0469 | 1001 | |
783863d6 | 1002 | void fuse_free_conn(struct fuse_conn *fc) |
43901aab | 1003 | { |
cc080e9e | 1004 | WARN_ON(!list_empty(&fc->devices)); |
dd3e2c55 | 1005 | kfree_rcu(fc, rcu); |
43901aab | 1006 | } |
783863d6 | 1007 | EXPORT_SYMBOL_GPL(fuse_free_conn); |
43901aab | 1008 | |
a325f9b9 TH |
1009 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
1010 | { | |
1011 | int err; | |
5f7f7543 | 1012 | char *suffix = ""; |
a325f9b9 | 1013 | |
69c8ebf8 | 1014 | if (sb->s_bdev) { |
5f7f7543 | 1015 | suffix = "-fuseblk"; |
69c8ebf8 JK |
1016 | /* |
1017 | * sb->s_bdi points to blkdev's bdi however we want to redirect | |
1018 | * it to our private bdi... | |
1019 | */ | |
1020 | bdi_put(sb->s_bdi); | |
1021 | sb->s_bdi = &noop_backing_dev_info; | |
1022 | } | |
5f7f7543 JK |
1023 | err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), |
1024 | MINOR(fc->dev), suffix); | |
a325f9b9 TH |
1025 | if (err) |
1026 | return err; | |
1027 | ||
b5420237 | 1028 | sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; |
5f7f7543 JK |
1029 | /* fuse does it's own writeback accounting */ |
1030 | sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; | |
a325f9b9 | 1031 | |
a325f9b9 TH |
1032 | /* |
1033 | * For a single fuse filesystem use max 1% of dirty + | |
1034 | * writeback threshold. | |
1035 | * | |
1036 | * This gives about 1M of write buffer for memory maps on a | |
1037 | * machine with 1G and 10% dirty_ratio, which should be more | |
1038 | * than enough. | |
1039 | * | |
1040 | * Privileged users can raise it by writing to | |
1041 | * | |
1042 | * /sys/class/bdi/<bdi>/max_ratio | |
1043 | */ | |
5f7f7543 | 1044 | bdi_set_max_ratio(sb->s_bdi, 1); |
a325f9b9 TH |
1045 | |
1046 | return 0; | |
1047 | } | |
1048 | ||
0cd1eb9a | 1049 | struct fuse_dev *fuse_dev_alloc(void) |
cc080e9e MS |
1050 | { |
1051 | struct fuse_dev *fud; | |
be2ff42c | 1052 | struct list_head *pq; |
cc080e9e MS |
1053 | |
1054 | fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); | |
be2ff42c KT |
1055 | if (!fud) |
1056 | return NULL; | |
cc080e9e | 1057 | |
be2ff42c KT |
1058 | pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); |
1059 | if (!pq) { | |
1060 | kfree(fud); | |
1061 | return NULL; | |
cc080e9e MS |
1062 | } |
1063 | ||
be2ff42c | 1064 | fud->pq.processing = pq; |
be2ff42c KT |
1065 | fuse_pqueue_init(&fud->pq); |
1066 | ||
0cd1eb9a VG |
1067 | return fud; |
1068 | } | |
1069 | EXPORT_SYMBOL_GPL(fuse_dev_alloc); | |
1070 | ||
1071 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc) | |
1072 | { | |
1073 | fud->fc = fuse_conn_get(fc); | |
be2ff42c KT |
1074 | spin_lock(&fc->lock); |
1075 | list_add_tail(&fud->entry, &fc->devices); | |
1076 | spin_unlock(&fc->lock); | |
0cd1eb9a VG |
1077 | } |
1078 | EXPORT_SYMBOL_GPL(fuse_dev_install); | |
be2ff42c | 1079 | |
0cd1eb9a VG |
1080 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc) |
1081 | { | |
1082 | struct fuse_dev *fud; | |
1083 | ||
1084 | fud = fuse_dev_alloc(); | |
1085 | if (!fud) | |
1086 | return NULL; | |
1087 | ||
1088 | fuse_dev_install(fud, fc); | |
cc080e9e MS |
1089 | return fud; |
1090 | } | |
0cd1eb9a | 1091 | EXPORT_SYMBOL_GPL(fuse_dev_alloc_install); |
cc080e9e MS |
1092 | |
1093 | void fuse_dev_free(struct fuse_dev *fud) | |
1094 | { | |
1095 | struct fuse_conn *fc = fud->fc; | |
1096 | ||
1097 | if (fc) { | |
1098 | spin_lock(&fc->lock); | |
1099 | list_del(&fud->entry); | |
1100 | spin_unlock(&fc->lock); | |
1101 | ||
1102 | fuse_conn_put(fc); | |
1103 | } | |
d72f70da | 1104 | kfree(fud->pq.processing); |
cc080e9e MS |
1105 | kfree(fud); |
1106 | } | |
1107 | EXPORT_SYMBOL_GPL(fuse_dev_free); | |
1108 | ||
0cc2656c | 1109 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) |
d8a5ba45 | 1110 | { |
cc080e9e | 1111 | struct fuse_dev *fud; |
0cc2656c | 1112 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
d8a5ba45 | 1113 | struct inode *root; |
f543f253 | 1114 | struct dentry *root_dentry; |
d8a5ba45 MS |
1115 | int err; |
1116 | ||
c2b8f006 | 1117 | err = -EINVAL; |
1751e8a6 | 1118 | if (sb->s_flags & SB_MANDLOCK) |
c2b8f006 | 1119 | goto err; |
71421259 | 1120 | |
1751e8a6 | 1121 | sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); |
9e1f1de0 | 1122 | |
0cc2656c | 1123 | if (ctx->is_bdev) { |
875d95ec | 1124 | #ifdef CONFIG_BLOCK |
c2b8f006 | 1125 | err = -EINVAL; |
c30da2e9 | 1126 | if (!sb_set_blocksize(sb, ctx->blksize)) |
c2b8f006 | 1127 | goto err; |
875d95ec | 1128 | #endif |
d8091614 | 1129 | } else { |
09cbfeaf KS |
1130 | sb->s_blocksize = PAGE_SIZE; |
1131 | sb->s_blocksize_bits = PAGE_SHIFT; | |
d8091614 | 1132 | } |
c30da2e9 DH |
1133 | |
1134 | sb->s_subtype = ctx->subtype; | |
1135 | ctx->subtype = NULL; | |
d8a5ba45 MS |
1136 | sb->s_magic = FUSE_SUPER_MAGIC; |
1137 | sb->s_op = &fuse_super_operations; | |
703c7362 | 1138 | sb->s_xattr = fuse_xattr_handlers; |
d8a5ba45 | 1139 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
0a2da9b2 | 1140 | sb->s_time_gran = 1; |
dbd561d2 | 1141 | sb->s_export_op = &fuse_export_operations; |
0834136a MZ |
1142 | sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; |
1143 | if (sb->s_user_ns != &init_user_ns) | |
1144 | sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; | |
d8a5ba45 | 1145 | |
e45b2546 EB |
1146 | /* |
1147 | * If we are not in the initial user namespace posix | |
1148 | * acls must be translated. | |
1149 | */ | |
1150 | if (sb->s_user_ns != &init_user_ns) | |
1151 | sb->s_xattr = fuse_no_acl_xattr_handlers; | |
1152 | ||
0cd1eb9a | 1153 | fud = fuse_dev_alloc_install(fc); |
cc080e9e | 1154 | if (!fud) |
0cc2656c | 1155 | goto err; |
cc080e9e | 1156 | |
a325f9b9 | 1157 | fc->dev = sb->s_dev; |
3b463ae0 | 1158 | fc->sb = sb; |
a325f9b9 TH |
1159 | err = fuse_bdi_init(fc, sb); |
1160 | if (err) | |
cc080e9e | 1161 | goto err_dev_free; |
0d179aa5 | 1162 | |
e0a43ddc | 1163 | /* Handle umasking inside the fuse code */ |
1751e8a6 | 1164 | if (sb->s_flags & SB_POSIXACL) |
e0a43ddc | 1165 | fc->dont_mask = 1; |
1751e8a6 | 1166 | sb->s_flags |= SB_POSIXACL; |
e0a43ddc | 1167 | |
c30da2e9 DH |
1168 | fc->default_permissions = ctx->default_permissions; |
1169 | fc->allow_other = ctx->allow_other; | |
1170 | fc->user_id = ctx->user_id; | |
1171 | fc->group_id = ctx->group_id; | |
1172 | fc->max_read = max_t(unsigned, 4096, ctx->max_read); | |
783863d6 | 1173 | fc->destroy = ctx->destroy; |
f543f253 | 1174 | |
d8a5ba45 | 1175 | err = -ENOMEM; |
c30da2e9 | 1176 | root = fuse_get_root_inode(sb, ctx->rootmode); |
0ce267ff | 1177 | sb->s_d_op = &fuse_root_dentry_operations; |
48fde701 AV |
1178 | root_dentry = d_make_root(root); |
1179 | if (!root_dentry) | |
cc080e9e | 1180 | goto err_dev_free; |
0ce267ff | 1181 | /* Root dentry doesn't have .d_revalidate */ |
c35eebe9 | 1182 | sb->s_d_op = &fuse_dentry_operations; |
f543f253 | 1183 | |
bafa9654 | 1184 | mutex_lock(&fuse_mutex); |
8aa09a50 | 1185 | err = -EINVAL; |
0cc2656c | 1186 | if (*ctx->fudptr) |
bafa9654 | 1187 | goto err_unlock; |
8aa09a50 | 1188 | |
bafa9654 MS |
1189 | err = fuse_ctl_add_conn(fc); |
1190 | if (err) | |
1191 | goto err_unlock; | |
1192 | ||
1193 | list_add_tail(&fc->entry, &fuse_conn_list); | |
f543f253 | 1194 | sb->s_root = root_dentry; |
0cc2656c | 1195 | *ctx->fudptr = fud; |
bafa9654 | 1196 | mutex_unlock(&fuse_mutex); |
0cc2656c SH |
1197 | return 0; |
1198 | ||
1199 | err_unlock: | |
1200 | mutex_unlock(&fuse_mutex); | |
1201 | dput(root_dentry); | |
1202 | err_dev_free: | |
1203 | fuse_dev_free(fud); | |
1204 | err: | |
1205 | return err; | |
1206 | } | |
1207 | EXPORT_SYMBOL_GPL(fuse_fill_super_common); | |
1208 | ||
1209 | static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc) | |
1210 | { | |
1211 | struct fuse_fs_context *ctx = fsc->fs_private; | |
1212 | struct file *file; | |
1213 | int err; | |
1214 | struct fuse_conn *fc; | |
1215 | ||
1216 | err = -EINVAL; | |
1217 | file = fget(ctx->fd); | |
1218 | if (!file) | |
1219 | goto err; | |
1220 | ||
1221 | /* | |
1222 | * Require mount to happen from the same user namespace which | |
1223 | * opened /dev/fuse to prevent potential attacks. | |
1224 | */ | |
1225 | if ((file->f_op != &fuse_dev_operations) || | |
1226 | (file->f_cred->user_ns != sb->s_user_ns)) | |
1227 | goto err_fput; | |
1228 | ctx->fudptr = &file->private_data; | |
1229 | ||
1230 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); | |
1231 | err = -ENOMEM; | |
1232 | if (!fc) | |
1233 | goto err_fput; | |
1234 | ||
ae3aad77 | 1235 | fuse_conn_init(fc, sb->s_user_ns, &fuse_dev_fiq_ops, NULL); |
0cc2656c SH |
1236 | fc->release = fuse_free_conn; |
1237 | sb->s_fs_info = fc; | |
1238 | ||
1239 | err = fuse_fill_super_common(sb, ctx); | |
1240 | if (err) | |
1241 | goto err_put_conn; | |
0720b315 MS |
1242 | /* |
1243 | * atomic_dec_and_test() in fput() provides the necessary | |
1244 | * memory barrier for file->private_data to be visible on all | |
1245 | * CPUs after this | |
1246 | */ | |
1247 | fput(file); | |
0cc2656c | 1248 | fuse_send_init(get_fuse_conn_super(sb)); |
d8a5ba45 MS |
1249 | return 0; |
1250 | ||
c2b8f006 | 1251 | err_put_conn: |
bafa9654 | 1252 | fuse_conn_put(fc); |
543b8f86 | 1253 | sb->s_fs_info = NULL; |
c2b8f006 MS |
1254 | err_fput: |
1255 | fput(file); | |
1256 | err: | |
d8a5ba45 MS |
1257 | return err; |
1258 | } | |
1259 | ||
c30da2e9 | 1260 | static int fuse_get_tree(struct fs_context *fc) |
d8a5ba45 | 1261 | { |
c30da2e9 DH |
1262 | struct fuse_fs_context *ctx = fc->fs_private; |
1263 | ||
1264 | if (!ctx->fd_present || !ctx->rootmode_present || | |
1265 | !ctx->user_id_present || !ctx->group_id_present) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | #ifdef CONFIG_BLOCK | |
1269 | if (ctx->is_bdev) | |
1270 | return get_tree_bdev(fc, fuse_fill_super); | |
1271 | #endif | |
1272 | ||
1273 | return get_tree_nodev(fc, fuse_fill_super); | |
1274 | } | |
1275 | ||
1276 | static const struct fs_context_operations fuse_context_ops = { | |
1277 | .free = fuse_free_fc, | |
1278 | .parse_param = fuse_parse_param, | |
1279 | .get_tree = fuse_get_tree, | |
1280 | }; | |
1281 | ||
1282 | /* | |
1283 | * Set up the filesystem mount context. | |
1284 | */ | |
1285 | static int fuse_init_fs_context(struct fs_context *fc) | |
1286 | { | |
1287 | struct fuse_fs_context *ctx; | |
1288 | ||
1289 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); | |
1290 | if (!ctx) | |
1291 | return -ENOMEM; | |
1292 | ||
1293 | ctx->max_read = ~0; | |
1294 | ctx->blksize = FUSE_DEFAULT_BLKSIZE; | |
1295 | ||
1296 | #ifdef CONFIG_BLOCK | |
783863d6 | 1297 | if (fc->fs_type == &fuseblk_fs_type) { |
c30da2e9 | 1298 | ctx->is_bdev = true; |
783863d6 MS |
1299 | ctx->destroy = true; |
1300 | } | |
c30da2e9 DH |
1301 | #endif |
1302 | ||
1303 | fc->fs_private = ctx; | |
1304 | fc->ops = &fuse_context_ops; | |
1305 | return 0; | |
d8a5ba45 MS |
1306 | } |
1307 | ||
e8f3bd77 | 1308 | static void fuse_sb_destroy(struct super_block *sb) |
3b463ae0 JM |
1309 | { |
1310 | struct fuse_conn *fc = get_fuse_conn_super(sb); | |
1311 | ||
1312 | if (fc) { | |
1ccd1ea2 MS |
1313 | if (fc->destroy) |
1314 | fuse_send_destroy(fc); | |
e8f3bd77 | 1315 | |
eb98e3bd | 1316 | fuse_abort_conn(fc); |
e8f3bd77 MS |
1317 | fuse_wait_aborted(fc); |
1318 | ||
3b463ae0 JM |
1319 | down_write(&fc->killsb); |
1320 | fc->sb = NULL; | |
1321 | up_write(&fc->killsb); | |
1322 | } | |
e8f3bd77 | 1323 | } |
3b463ae0 | 1324 | |
783863d6 | 1325 | void fuse_kill_sb_anon(struct super_block *sb) |
e8f3bd77 MS |
1326 | { |
1327 | fuse_sb_destroy(sb); | |
3b463ae0 JM |
1328 | kill_anon_super(sb); |
1329 | } | |
783863d6 | 1330 | EXPORT_SYMBOL_GPL(fuse_kill_sb_anon); |
3b463ae0 | 1331 | |
875d95ec MS |
1332 | static struct file_system_type fuse_fs_type = { |
1333 | .owner = THIS_MODULE, | |
1334 | .name = "fuse", | |
4ad769f3 | 1335 | .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, |
c30da2e9 DH |
1336 | .init_fs_context = fuse_init_fs_context, |
1337 | .parameters = &fuse_fs_parameters, | |
3b463ae0 | 1338 | .kill_sb = fuse_kill_sb_anon, |
875d95ec | 1339 | }; |
7f78e035 | 1340 | MODULE_ALIAS_FS("fuse"); |
875d95ec MS |
1341 | |
1342 | #ifdef CONFIG_BLOCK | |
3b463ae0 JM |
1343 | static void fuse_kill_sb_blk(struct super_block *sb) |
1344 | { | |
e8f3bd77 | 1345 | fuse_sb_destroy(sb); |
3b463ae0 JM |
1346 | kill_block_super(sb); |
1347 | } | |
1348 | ||
d6392f87 MS |
1349 | static struct file_system_type fuseblk_fs_type = { |
1350 | .owner = THIS_MODULE, | |
1351 | .name = "fuseblk", | |
c30da2e9 DH |
1352 | .init_fs_context = fuse_init_fs_context, |
1353 | .parameters = &fuse_fs_parameters, | |
3b463ae0 | 1354 | .kill_sb = fuse_kill_sb_blk, |
edad01e2 | 1355 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
d6392f87 | 1356 | }; |
7f78e035 | 1357 | MODULE_ALIAS_FS("fuseblk"); |
d6392f87 | 1358 | |
875d95ec MS |
1359 | static inline int register_fuseblk(void) |
1360 | { | |
1361 | return register_filesystem(&fuseblk_fs_type); | |
1362 | } | |
1363 | ||
1364 | static inline void unregister_fuseblk(void) | |
1365 | { | |
1366 | unregister_filesystem(&fuseblk_fs_type); | |
1367 | } | |
1368 | #else | |
1369 | static inline int register_fuseblk(void) | |
1370 | { | |
1371 | return 0; | |
1372 | } | |
1373 | ||
1374 | static inline void unregister_fuseblk(void) | |
1375 | { | |
1376 | } | |
1377 | #endif | |
1378 | ||
51cc5068 | 1379 | static void fuse_inode_init_once(void *foo) |
d8a5ba45 | 1380 | { |
1729a16c | 1381 | struct inode *inode = foo; |
d8a5ba45 | 1382 | |
a35afb83 | 1383 | inode_init_once(inode); |
d8a5ba45 MS |
1384 | } |
1385 | ||
1386 | static int __init fuse_fs_init(void) | |
1387 | { | |
1388 | int err; | |
1389 | ||
d6392f87 | 1390 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
df206988 JW |
1391 | sizeof(struct fuse_inode), 0, |
1392 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, | |
1393 | fuse_inode_init_once); | |
d6392f87 MS |
1394 | err = -ENOMEM; |
1395 | if (!fuse_inode_cachep) | |
988f0325 AV |
1396 | goto out; |
1397 | ||
1398 | err = register_fuseblk(); | |
1399 | if (err) | |
1400 | goto out2; | |
1401 | ||
1402 | err = register_filesystem(&fuse_fs_type); | |
1403 | if (err) | |
1404 | goto out3; | |
d6392f87 MS |
1405 | |
1406 | return 0; | |
d8a5ba45 | 1407 | |
988f0325 | 1408 | out3: |
875d95ec | 1409 | unregister_fuseblk(); |
988f0325 AV |
1410 | out2: |
1411 | kmem_cache_destroy(fuse_inode_cachep); | |
d6392f87 | 1412 | out: |
d8a5ba45 MS |
1413 | return err; |
1414 | } | |
1415 | ||
1416 | static void fuse_fs_cleanup(void) | |
1417 | { | |
1418 | unregister_filesystem(&fuse_fs_type); | |
875d95ec | 1419 | unregister_fuseblk(); |
8c0a8537 KS |
1420 | |
1421 | /* | |
1422 | * Make sure all delayed rcu free inodes are flushed before we | |
1423 | * destroy cache. | |
1424 | */ | |
1425 | rcu_barrier(); | |
d8a5ba45 MS |
1426 | kmem_cache_destroy(fuse_inode_cachep); |
1427 | } | |
1428 | ||
5c89e17e | 1429 | static struct kobject *fuse_kobj; |
5c89e17e | 1430 | |
f543f253 MS |
1431 | static int fuse_sysfs_init(void) |
1432 | { | |
1433 | int err; | |
1434 | ||
00d26666 | 1435 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
5c89e17e GKH |
1436 | if (!fuse_kobj) { |
1437 | err = -ENOMEM; | |
f543f253 | 1438 | goto out_err; |
5c89e17e | 1439 | } |
f543f253 | 1440 | |
f9bb4882 EB |
1441 | err = sysfs_create_mount_point(fuse_kobj, "connections"); |
1442 | if (err) | |
f543f253 MS |
1443 | goto out_fuse_unregister; |
1444 | ||
1445 | return 0; | |
1446 | ||
1447 | out_fuse_unregister: | |
197b12d6 | 1448 | kobject_put(fuse_kobj); |
f543f253 MS |
1449 | out_err: |
1450 | return err; | |
1451 | } | |
1452 | ||
1453 | static void fuse_sysfs_cleanup(void) | |
1454 | { | |
f9bb4882 | 1455 | sysfs_remove_mount_point(fuse_kobj, "connections"); |
197b12d6 | 1456 | kobject_put(fuse_kobj); |
f543f253 MS |
1457 | } |
1458 | ||
d8a5ba45 MS |
1459 | static int __init fuse_init(void) |
1460 | { | |
1461 | int res; | |
1462 | ||
f2294482 KS |
1463 | pr_info("init (API version %i.%i)\n", |
1464 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); | |
d8a5ba45 | 1465 | |
bafa9654 | 1466 | INIT_LIST_HEAD(&fuse_conn_list); |
d8a5ba45 MS |
1467 | res = fuse_fs_init(); |
1468 | if (res) | |
1469 | goto err; | |
1470 | ||
334f485d MS |
1471 | res = fuse_dev_init(); |
1472 | if (res) | |
1473 | goto err_fs_cleanup; | |
1474 | ||
f543f253 MS |
1475 | res = fuse_sysfs_init(); |
1476 | if (res) | |
1477 | goto err_dev_cleanup; | |
1478 | ||
bafa9654 MS |
1479 | res = fuse_ctl_init(); |
1480 | if (res) | |
1481 | goto err_sysfs_cleanup; | |
1482 | ||
487ea5af CH |
1483 | sanitize_global_limit(&max_user_bgreq); |
1484 | sanitize_global_limit(&max_user_congthresh); | |
1485 | ||
d8a5ba45 MS |
1486 | return 0; |
1487 | ||
bafa9654 MS |
1488 | err_sysfs_cleanup: |
1489 | fuse_sysfs_cleanup(); | |
f543f253 MS |
1490 | err_dev_cleanup: |
1491 | fuse_dev_cleanup(); | |
334f485d MS |
1492 | err_fs_cleanup: |
1493 | fuse_fs_cleanup(); | |
d8a5ba45 MS |
1494 | err: |
1495 | return res; | |
1496 | } | |
1497 | ||
1498 | static void __exit fuse_exit(void) | |
1499 | { | |
f2294482 | 1500 | pr_debug("exit\n"); |
d8a5ba45 | 1501 | |
bafa9654 | 1502 | fuse_ctl_cleanup(); |
f543f253 | 1503 | fuse_sysfs_cleanup(); |
d8a5ba45 | 1504 | fuse_fs_cleanup(); |
334f485d | 1505 | fuse_dev_cleanup(); |
d8a5ba45 MS |
1506 | } |
1507 | ||
1508 | module_init(fuse_init); | |
1509 | module_exit(fuse_exit); |