Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f1adc05e | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | * | |
5 | * Ported the filesystem routines to 2.5. | |
6 | * 2003-02-10 Petr Baudis <pasky@ucw.cz> | |
7 | */ | |
8 | ||
1da177e4 | 9 | #include <linux/fs.h> |
2b3b9bb0 | 10 | #include <linux/magic.h> |
1da177e4 | 11 | #include <linux/module.h> |
84b3db04 | 12 | #include <linux/mm.h> |
1da177e4 | 13 | #include <linux/pagemap.h> |
1da177e4 | 14 | #include <linux/statfs.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
dd2cc4df | 16 | #include <linux/seq_file.h> |
187c82cb | 17 | #include <linux/writeback.h> |
6966a977 | 18 | #include <linux/mount.h> |
d0352d3e | 19 | #include <linux/namei.h> |
1da177e4 | 20 | #include "hostfs.h" |
37185b33 AV |
21 | #include <init.h> |
22 | #include <kern.h> | |
1da177e4 LT |
23 | |
24 | struct hostfs_inode_info { | |
1da177e4 | 25 | int fd; |
aeb5d727 | 26 | fmode_t mode; |
1da177e4 | 27 | struct inode vfs_inode; |
69886e67 | 28 | struct mutex open_mutex; |
1da177e4 LT |
29 | }; |
30 | ||
31 | static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode) | |
32 | { | |
f1adc05e | 33 | return list_entry(inode, struct hostfs_inode_info, vfs_inode); |
1da177e4 LT |
34 | } |
35 | ||
496ad9aa | 36 | #define FILE_HOSTFS_I(file) HOSTFS_I(file_inode(file)) |
1da177e4 | 37 | |
a15f1e41 JB |
38 | static struct kmem_cache *hostfs_inode_cache; |
39 | ||
1da177e4 | 40 | /* Changed in hostfs_args before the kernel starts running */ |
a6eb0be6 | 41 | static char *root_ino = ""; |
1da177e4 LT |
42 | static int append = 0; |
43 | ||
92e1d5be AV |
44 | static const struct inode_operations hostfs_iops; |
45 | static const struct inode_operations hostfs_dir_iops; | |
d0352d3e | 46 | static const struct inode_operations hostfs_link_iops; |
1da177e4 LT |
47 | |
48 | #ifndef MODULE | |
49 | static int __init hostfs_args(char *options, int *add) | |
50 | { | |
51 | char *ptr; | |
52 | ||
53 | ptr = strchr(options, ','); | |
84b3db04 | 54 | if (ptr != NULL) |
1da177e4 | 55 | *ptr++ = '\0'; |
84b3db04 | 56 | if (*options != '\0') |
1da177e4 LT |
57 | root_ino = options; |
58 | ||
59 | options = ptr; | |
84b3db04 | 60 | while (options) { |
1da177e4 | 61 | ptr = strchr(options, ','); |
84b3db04 | 62 | if (ptr != NULL) |
1da177e4 | 63 | *ptr++ = '\0'; |
84b3db04 JD |
64 | if (*options != '\0') { |
65 | if (!strcmp(options, "append")) | |
1da177e4 LT |
66 | append = 1; |
67 | else printf("hostfs_args - unsupported option - %s\n", | |
68 | options); | |
69 | } | |
70 | options = ptr; | |
71 | } | |
f1adc05e | 72 | return 0; |
1da177e4 LT |
73 | } |
74 | ||
75 | __uml_setup("hostfs=", hostfs_args, | |
76 | "hostfs=<root dir>,<flags>,...\n" | |
77 | " This is used to set hostfs parameters. The root directory argument\n" | |
78 | " is used to confine all hostfs mounts to within the specified directory\n" | |
79 | " tree on the host. If this isn't specified, then a user inside UML can\n" | |
80 | " mount anything on the host that's accessible to the user that's running\n" | |
81 | " it.\n" | |
82 | " The only flag currently supported is 'append', which specifies that all\n" | |
83 | " files opened by hostfs will be opened in append mode.\n\n" | |
84 | ); | |
85 | #endif | |
86 | ||
e9193059 | 87 | static char *__dentry_name(struct dentry *dentry, char *name) |
1da177e4 | 88 | { |
ec2447c2 | 89 | char *p = dentry_path_raw(dentry, name, PATH_MAX); |
e9193059 AV |
90 | char *root; |
91 | size_t len; | |
1da177e4 | 92 | |
e9193059 AV |
93 | root = dentry->d_sb->s_fs_info; |
94 | len = strlen(root); | |
95 | if (IS_ERR(p)) { | |
96 | __putname(name); | |
f1adc05e | 97 | return NULL; |
1da177e4 | 98 | } |
aad50b1e RW |
99 | |
100 | /* | |
101 | * This function relies on the fact that dentry_path_raw() will place | |
102 | * the path name at the end of the provided buffer. | |
103 | */ | |
104 | BUG_ON(p + strlen(p) + 1 != name + PATH_MAX); | |
105 | ||
b7f28a37 | 106 | strscpy(name, root, PATH_MAX); |
e9193059 AV |
107 | if (len > p - name) { |
108 | __putname(name); | |
109 | return NULL; | |
110 | } | |
c278e81b RW |
111 | |
112 | if (p > name + len) | |
113 | strcpy(name + len, p); | |
114 | ||
f1adc05e | 115 | return name; |
1da177e4 LT |
116 | } |
117 | ||
e9193059 AV |
118 | static char *dentry_name(struct dentry *dentry) |
119 | { | |
120 | char *name = __getname(); | |
121 | if (!name) | |
122 | return NULL; | |
123 | ||
9dcc5e8a | 124 | return __dentry_name(dentry, name); |
e9193059 AV |
125 | } |
126 | ||
c5322220 | 127 | static char *inode_name(struct inode *ino) |
1da177e4 LT |
128 | { |
129 | struct dentry *dentry; | |
ec2447c2 | 130 | char *name; |
1da177e4 | 131 | |
ec2447c2 NP |
132 | dentry = d_find_alias(ino); |
133 | if (!dentry) | |
e9193059 | 134 | return NULL; |
ec2447c2 NP |
135 | |
136 | name = dentry_name(dentry); | |
137 | ||
138 | dput(dentry); | |
139 | ||
140 | return name; | |
1da177e4 LT |
141 | } |
142 | ||
1da177e4 LT |
143 | static char *follow_link(char *link) |
144 | { | |
1da177e4 | 145 | char *name, *resolved, *end; |
b58c4e96 | 146 | int n; |
1da177e4 | 147 | |
7f6c411c | 148 | name = kmalloc(PATH_MAX, GFP_KERNEL); |
7c950992 | 149 | if (!name) { |
1da177e4 | 150 | n = -ENOMEM; |
7c950992 | 151 | goto out_free; |
1da177e4 | 152 | } |
7c950992 RW |
153 | |
154 | n = hostfs_do_readlink(link, name, PATH_MAX); | |
84b3db04 | 155 | if (n < 0) |
1da177e4 | 156 | goto out_free; |
7c950992 RW |
157 | else if (n == PATH_MAX) { |
158 | n = -E2BIG; | |
159 | goto out_free; | |
160 | } | |
1da177e4 | 161 | |
84b3db04 | 162 | if (*name == '/') |
f1adc05e | 163 | return name; |
1da177e4 LT |
164 | |
165 | end = strrchr(link, '/'); | |
84b3db04 | 166 | if (end == NULL) |
f1adc05e | 167 | return name; |
1da177e4 LT |
168 | |
169 | *(end + 1) = '\0'; | |
1da177e4 | 170 | |
b58c4e96 | 171 | resolved = kasprintf(GFP_KERNEL, "%s%s", link, name); |
84b3db04 | 172 | if (resolved == NULL) { |
1da177e4 LT |
173 | n = -ENOMEM; |
174 | goto out_free; | |
175 | } | |
176 | ||
7f6c411c | 177 | kfree(name); |
f1adc05e | 178 | return resolved; |
1da177e4 LT |
179 | |
180 | out_free: | |
7f6c411c | 181 | kfree(name); |
f1adc05e | 182 | return ERR_PTR(n); |
1da177e4 LT |
183 | } |
184 | ||
0a370e5d DH |
185 | static struct inode *hostfs_iget(struct super_block *sb) |
186 | { | |
52b209f7 | 187 | struct inode *inode = new_inode(sb); |
0a370e5d DH |
188 | if (!inode) |
189 | return ERR_PTR(-ENOMEM); | |
0a370e5d DH |
190 | return inode; |
191 | } | |
192 | ||
9e443bc3 | 193 | static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf) |
1da177e4 | 194 | { |
84b3db04 JD |
195 | /* |
196 | * do_statfs uses struct statfs64 internally, but the linux kernel | |
1da177e4 LT |
197 | * struct statfs still has 32-bit versions for most of these fields, |
198 | * so we convert them here | |
199 | */ | |
200 | int err; | |
201 | long long f_blocks; | |
202 | long long f_bfree; | |
203 | long long f_bavail; | |
204 | long long f_files; | |
205 | long long f_ffree; | |
206 | ||
601d2c38 | 207 | err = do_statfs(dentry->d_sb->s_fs_info, |
1da177e4 LT |
208 | &sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files, |
209 | &f_ffree, &sf->f_fsid, sizeof(sf->f_fsid), | |
1b627d57 | 210 | &sf->f_namelen); |
84b3db04 | 211 | if (err) |
f1adc05e | 212 | return err; |
1da177e4 LT |
213 | sf->f_blocks = f_blocks; |
214 | sf->f_bfree = f_bfree; | |
215 | sf->f_bavail = f_bavail; | |
216 | sf->f_files = f_files; | |
217 | sf->f_ffree = f_ffree; | |
218 | sf->f_type = HOSTFS_SUPER_MAGIC; | |
f1adc05e | 219 | return 0; |
1da177e4 LT |
220 | } |
221 | ||
222 | static struct inode *hostfs_alloc_inode(struct super_block *sb) | |
223 | { | |
224 | struct hostfs_inode_info *hi; | |
225 | ||
fd60b288 | 226 | hi = alloc_inode_sb(sb, hostfs_inode_cache, GFP_KERNEL_ACCOUNT); |
84b3db04 | 227 | if (hi == NULL) |
f1adc05e | 228 | return NULL; |
601d2c38 | 229 | hi->fd = -1; |
371fdab1 | 230 | hi->mode = 0; |
1da177e4 | 231 | inode_init_once(&hi->vfs_inode); |
69886e67 | 232 | mutex_init(&hi->open_mutex); |
f1adc05e | 233 | return &hi->vfs_inode; |
1da177e4 LT |
234 | } |
235 | ||
e971a6d7 | 236 | static void hostfs_evict_inode(struct inode *inode) |
1da177e4 | 237 | { |
91b0abe3 | 238 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 239 | clear_inode(inode); |
84b3db04 | 240 | if (HOSTFS_I(inode)->fd != -1) { |
1da177e4 LT |
241 | close_file(&HOSTFS_I(inode)->fd); |
242 | HOSTFS_I(inode)->fd = -1; | |
243 | } | |
1da177e4 LT |
244 | } |
245 | ||
08ccfc5c | 246 | static void hostfs_free_inode(struct inode *inode) |
1da177e4 | 247 | { |
a15f1e41 | 248 | kmem_cache_free(hostfs_inode_cache, HOSTFS_I(inode)); |
1da177e4 | 249 | } |
fa0d7e3d | 250 | |
34c80b1d | 251 | static int hostfs_show_options(struct seq_file *seq, struct dentry *root) |
dd2cc4df | 252 | { |
34c80b1d | 253 | const char *root_path = root->d_sb->s_fs_info; |
dd2cc4df MS |
254 | size_t offset = strlen(root_ino) + 1; |
255 | ||
256 | if (strlen(root_path) > offset) | |
a068acf2 | 257 | seq_show_option(seq, root_path + offset, NULL); |
dd2cc4df | 258 | |
7f74a668 RW |
259 | if (append) |
260 | seq_puts(seq, ",append"); | |
261 | ||
dd2cc4df MS |
262 | return 0; |
263 | } | |
264 | ||
ee9b6d61 | 265 | static const struct super_operations hostfs_sbops = { |
1da177e4 | 266 | .alloc_inode = hostfs_alloc_inode, |
08ccfc5c | 267 | .free_inode = hostfs_free_inode, |
e971a6d7 | 268 | .evict_inode = hostfs_evict_inode, |
1da177e4 | 269 | .statfs = hostfs_statfs, |
dd2cc4df | 270 | .show_options = hostfs_show_options, |
1da177e4 LT |
271 | }; |
272 | ||
9e443bc3 | 273 | static int hostfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 LT |
274 | { |
275 | void *dir; | |
276 | char *name; | |
277 | unsigned long long next, ino; | |
278 | int error, len; | |
3ee6bd8e | 279 | unsigned int type; |
1da177e4 | 280 | |
c5322220 | 281 | name = dentry_name(file->f_path.dentry); |
84b3db04 | 282 | if (name == NULL) |
f1adc05e | 283 | return -ENOMEM; |
1da177e4 | 284 | dir = open_dir(name, &error); |
e9193059 | 285 | __putname(name); |
84b3db04 | 286 | if (dir == NULL) |
f1adc05e | 287 | return -error; |
8e28bc7e | 288 | next = ctx->pos; |
0c9bd636 | 289 | seek_dir(dir, next); |
3ee6bd8e | 290 | while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) { |
8e28bc7e AV |
291 | if (!dir_emit(ctx, name, len, ino, type)) |
292 | break; | |
293 | ctx->pos = next; | |
1da177e4 LT |
294 | } |
295 | close_dir(dir); | |
f1adc05e | 296 | return 0; |
1da177e4 LT |
297 | } |
298 | ||
4c6dcafc | 299 | static int hostfs_open(struct inode *ino, struct file *file) |
1da177e4 LT |
300 | { |
301 | char *name; | |
bd1052a2 | 302 | fmode_t mode; |
f8ad850f | 303 | int err; |
bd1052a2 | 304 | int r, w, fd; |
1da177e4 LT |
305 | |
306 | mode = file->f_mode & (FMODE_READ | FMODE_WRITE); | |
84b3db04 | 307 | if ((mode & HOSTFS_I(ino)->mode) == mode) |
f1adc05e | 308 | return 0; |
1da177e4 | 309 | |
f8ad850f | 310 | mode |= HOSTFS_I(ino)->mode; |
1da177e4 | 311 | |
f8ad850f | 312 | retry: |
a9d1958b RW |
313 | r = w = 0; |
314 | ||
f8ad850f | 315 | if (mode & FMODE_READ) |
1da177e4 | 316 | r = 1; |
f8ad850f | 317 | if (mode & FMODE_WRITE) |
112a5da7 | 318 | r = w = 1; |
1da177e4 | 319 | |
d692d397 | 320 | name = dentry_name(file_dentry(file)); |
84b3db04 | 321 | if (name == NULL) |
f1adc05e | 322 | return -ENOMEM; |
1da177e4 LT |
323 | |
324 | fd = open_file(name, r, w, append); | |
e9193059 | 325 | __putname(name); |
84b3db04 | 326 | if (fd < 0) |
f1adc05e | 327 | return fd; |
f8ad850f | 328 | |
69886e67 | 329 | mutex_lock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
330 | /* somebody else had handled it first? */ |
331 | if ((mode & HOSTFS_I(ino)->mode) == mode) { | |
69886e67 | 332 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
af955658 | 333 | close_file(&fd); |
f8ad850f AV |
334 | return 0; |
335 | } | |
336 | if ((mode | HOSTFS_I(ino)->mode) != mode) { | |
337 | mode |= HOSTFS_I(ino)->mode; | |
69886e67 | 338 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
339 | close_file(&fd); |
340 | goto retry; | |
341 | } | |
342 | if (HOSTFS_I(ino)->fd == -1) { | |
343 | HOSTFS_I(ino)->fd = fd; | |
344 | } else { | |
345 | err = replace_file(fd, HOSTFS_I(ino)->fd); | |
346 | close_file(&fd); | |
347 | if (err < 0) { | |
69886e67 | 348 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
349 | return err; |
350 | } | |
351 | } | |
352 | HOSTFS_I(ino)->mode = mode; | |
69886e67 | 353 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
1da177e4 | 354 | |
f1adc05e | 355 | return 0; |
1da177e4 LT |
356 | } |
357 | ||
65984ff9 RW |
358 | static int hostfs_file_release(struct inode *inode, struct file *file) |
359 | { | |
360 | filemap_write_and_wait(inode->i_mapping); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
9e443bc3 JH |
365 | static int hostfs_fsync(struct file *file, loff_t start, loff_t end, |
366 | int datasync) | |
1da177e4 | 367 | { |
02c24a82 JB |
368 | struct inode *inode = file->f_mapping->host; |
369 | int ret; | |
370 | ||
3b49c9a1 | 371 | ret = file_write_and_wait_range(file, start, end); |
02c24a82 JB |
372 | if (ret) |
373 | return ret; | |
374 | ||
5955102c | 375 | inode_lock(inode); |
02c24a82 | 376 | ret = fsync_file(HOSTFS_I(inode)->fd, datasync); |
5955102c | 377 | inode_unlock(inode); |
02c24a82 JB |
378 | |
379 | return ret; | |
1da177e4 LT |
380 | } |
381 | ||
4b6f5d20 | 382 | static const struct file_operations hostfs_file_fops = { |
1da177e4 | 383 | .llseek = generic_file_llseek, |
5ffc4ef4 | 384 | .splice_read = generic_file_splice_read, |
1568cb0e | 385 | .splice_write = iter_file_splice_write, |
aad4f8bb | 386 | .read_iter = generic_file_read_iter, |
8174202b | 387 | .write_iter = generic_file_write_iter, |
1da177e4 | 388 | .mmap = generic_file_mmap, |
4c6dcafc | 389 | .open = hostfs_open, |
65984ff9 | 390 | .release = hostfs_file_release, |
1da177e4 LT |
391 | .fsync = hostfs_fsync, |
392 | }; | |
393 | ||
4b6f5d20 | 394 | static const struct file_operations hostfs_dir_fops = { |
1da177e4 | 395 | .llseek = generic_file_llseek, |
552a9d48 | 396 | .iterate_shared = hostfs_readdir, |
1da177e4 | 397 | .read = generic_read_dir, |
4c6dcafc RW |
398 | .open = hostfs_open, |
399 | .fsync = hostfs_fsync, | |
1da177e4 LT |
400 | }; |
401 | ||
9e443bc3 | 402 | static int hostfs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
403 | { |
404 | struct address_space *mapping = page->mapping; | |
405 | struct inode *inode = mapping->host; | |
406 | char *buffer; | |
af6aa1b9 | 407 | loff_t base = page_offset(page); |
09cbfeaf KS |
408 | int count = PAGE_SIZE; |
409 | int end_index = inode->i_size >> PAGE_SHIFT; | |
1da177e4 LT |
410 | int err; |
411 | ||
412 | if (page->index >= end_index) | |
09cbfeaf | 413 | count = inode->i_size & (PAGE_SIZE-1); |
1da177e4 | 414 | |
e0820368 | 415 | buffer = kmap_local_page(page); |
1da177e4 LT |
416 | |
417 | err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count); | |
84b3db04 | 418 | if (err != count) { |
e775dfb3 MWO |
419 | if (err >= 0) |
420 | err = -EIO; | |
421 | mapping_set_error(mapping, err); | |
1da177e4 LT |
422 | goto out; |
423 | } | |
424 | ||
425 | if (base > inode->i_size) | |
426 | inode->i_size = base; | |
427 | ||
1da177e4 LT |
428 | err = 0; |
429 | ||
430 | out: | |
e0820368 | 431 | kunmap_local(buffer); |
1da177e4 | 432 | unlock_page(page); |
e0820368 | 433 | |
1da177e4 LT |
434 | return err; |
435 | } | |
436 | ||
8f4fe249 | 437 | static int hostfs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 438 | { |
8f4fe249 | 439 | struct page *page = &folio->page; |
1da177e4 | 440 | char *buffer; |
af6aa1b9 | 441 | loff_t start = page_offset(page); |
b86b413a | 442 | int bytes_read, ret = 0; |
1da177e4 | 443 | |
e0820368 | 444 | buffer = kmap_local_page(page); |
41761ddf | 445 | bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer, |
09cbfeaf | 446 | PAGE_SIZE); |
41761ddf | 447 | if (bytes_read < 0) { |
b86b413a RW |
448 | ClearPageUptodate(page); |
449 | SetPageError(page); | |
41761ddf | 450 | ret = bytes_read; |
84b3db04 | 451 | goto out; |
41761ddf | 452 | } |
1da177e4 | 453 | |
09cbfeaf | 454 | memset(buffer + bytes_read, 0, PAGE_SIZE - bytes_read); |
1da177e4 | 455 | |
b86b413a | 456 | ClearPageError(page); |
1da177e4 | 457 | SetPageUptodate(page); |
b86b413a | 458 | |
1da177e4 | 459 | out: |
b86b413a | 460 | flush_dcache_page(page); |
e0820368 | 461 | kunmap_local(buffer); |
1da177e4 | 462 | unlock_page(page); |
e0820368 | 463 | |
41761ddf | 464 | return ret; |
1da177e4 LT |
465 | } |
466 | ||
9e443bc3 | 467 | static int hostfs_write_begin(struct file *file, struct address_space *mapping, |
9d6b0cd7 | 468 | loff_t pos, unsigned len, |
9e443bc3 | 469 | struct page **pagep, void **fsdata) |
1da177e4 | 470 | { |
09cbfeaf | 471 | pgoff_t index = pos >> PAGE_SHIFT; |
1da177e4 | 472 | |
b7446e7c | 473 | *pagep = grab_cache_page_write_begin(mapping, index); |
ae361ff4 NP |
474 | if (!*pagep) |
475 | return -ENOMEM; | |
476 | return 0; | |
1da177e4 LT |
477 | } |
478 | ||
9e443bc3 JH |
479 | static int hostfs_write_end(struct file *file, struct address_space *mapping, |
480 | loff_t pos, unsigned len, unsigned copied, | |
481 | struct page *page, void *fsdata) | |
1da177e4 | 482 | { |
1da177e4 | 483 | struct inode *inode = mapping->host; |
ae361ff4 | 484 | void *buffer; |
09cbfeaf | 485 | unsigned from = pos & (PAGE_SIZE - 1); |
ae361ff4 | 486 | int err; |
1da177e4 | 487 | |
e0820368 | 488 | buffer = kmap_local_page(page); |
ae361ff4 | 489 | err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer + from, copied); |
e0820368 | 490 | kunmap_local(buffer); |
30f04a4e | 491 | |
09cbfeaf | 492 | if (!PageUptodate(page) && err == PAGE_SIZE) |
ae361ff4 | 493 | SetPageUptodate(page); |
30f04a4e | 494 | |
84b3db04 JD |
495 | /* |
496 | * If err > 0, write_file has added err to pos, so we are comparing | |
ae361ff4 NP |
497 | * i_size against the last byte written. |
498 | */ | |
499 | if (err > 0 && (pos > inode->i_size)) | |
500 | inode->i_size = pos; | |
501 | unlock_page(page); | |
09cbfeaf | 502 | put_page(page); |
1da177e4 | 503 | |
f1adc05e | 504 | return err; |
1da177e4 LT |
505 | } |
506 | ||
f5e54d6e | 507 | static const struct address_space_operations hostfs_aops = { |
1da177e4 | 508 | .writepage = hostfs_writepage, |
8f4fe249 | 509 | .read_folio = hostfs_read_folio, |
187c82cb | 510 | .dirty_folio = filemap_dirty_folio, |
ae361ff4 NP |
511 | .write_begin = hostfs_write_begin, |
512 | .write_end = hostfs_write_end, | |
1da177e4 LT |
513 | }; |
514 | ||
4754b825 | 515 | static int read_name(struct inode *ino, char *name) |
1da177e4 | 516 | { |
4754b825 AV |
517 | dev_t rdev; |
518 | struct hostfs_stat st; | |
519 | int err = stat_file(name, &st, -1); | |
520 | if (err) | |
521 | return err; | |
1da177e4 | 522 | |
5e2df28c | 523 | /* Reencode maj and min with the kernel encoding.*/ |
4754b825 | 524 | rdev = MKDEV(st.maj, st.min); |
1da177e4 | 525 | |
4754b825 AV |
526 | switch (st.mode & S_IFMT) { |
527 | case S_IFLNK: | |
d0352d3e | 528 | ino->i_op = &hostfs_link_iops; |
1da177e4 | 529 | break; |
4754b825 AV |
530 | case S_IFDIR: |
531 | ino->i_op = &hostfs_dir_iops; | |
532 | ino->i_fop = &hostfs_dir_fops; | |
1da177e4 | 533 | break; |
4754b825 AV |
534 | case S_IFCHR: |
535 | case S_IFBLK: | |
536 | case S_IFIFO: | |
537 | case S_IFSOCK: | |
538 | init_special_inode(ino, st.mode & S_IFMT, rdev); | |
539 | ino->i_op = &hostfs_iops; | |
1da177e4 | 540 | break; |
2ad2dca6 | 541 | case S_IFREG: |
4754b825 AV |
542 | ino->i_op = &hostfs_iops; |
543 | ino->i_fop = &hostfs_file_fops; | |
544 | ino->i_mapping->a_ops = &hostfs_aops; | |
2ad2dca6 RW |
545 | break; |
546 | default: | |
547 | return -EIO; | |
1da177e4 | 548 | } |
4754b825 AV |
549 | |
550 | ino->i_ino = st.ino; | |
551 | ino->i_mode = st.mode; | |
bfe86848 | 552 | set_nlink(ino, st.nlink); |
29f82ae5 EB |
553 | i_uid_write(ino, st.uid); |
554 | i_gid_write(ino, st.gid); | |
bca30265 AB |
555 | ino->i_atime = (struct timespec64){ st.atime.tv_sec, st.atime.tv_nsec }; |
556 | ino->i_mtime = (struct timespec64){ st.mtime.tv_sec, st.mtime.tv_nsec }; | |
557 | ino->i_ctime = (struct timespec64){ st.ctime.tv_sec, st.ctime.tv_nsec }; | |
4754b825 AV |
558 | ino->i_size = st.size; |
559 | ino->i_blocks = st.blocks; | |
560 | return 0; | |
1da177e4 LT |
561 | } |
562 | ||
6c960e68 | 563 | static int hostfs_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 564 | struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
565 | { |
566 | struct inode *inode; | |
567 | char *name; | |
568 | int error, fd; | |
569 | ||
0a370e5d DH |
570 | inode = hostfs_iget(dir->i_sb); |
571 | if (IS_ERR(inode)) { | |
572 | error = PTR_ERR(inode); | |
84b3db04 | 573 | goto out; |
0a370e5d | 574 | } |
1da177e4 | 575 | |
1da177e4 | 576 | error = -ENOMEM; |
c5322220 | 577 | name = dentry_name(dentry); |
84b3db04 | 578 | if (name == NULL) |
1da177e4 LT |
579 | goto out_put; |
580 | ||
a718c922 | 581 | fd = file_create(name, mode & 0777); |
4754b825 | 582 | if (fd < 0) |
1da177e4 | 583 | error = fd; |
4754b825 | 584 | else |
5e2df28c | 585 | error = read_name(inode, name); |
1da177e4 | 586 | |
e9193059 | 587 | __putname(name); |
84b3db04 | 588 | if (error) |
1da177e4 LT |
589 | goto out_put; |
590 | ||
591 | HOSTFS_I(inode)->fd = fd; | |
592 | HOSTFS_I(inode)->mode = FMODE_READ | FMODE_WRITE; | |
593 | d_instantiate(dentry, inode); | |
f1adc05e | 594 | return 0; |
1da177e4 LT |
595 | |
596 | out_put: | |
597 | iput(inode); | |
598 | out: | |
f1adc05e | 599 | return error; |
1da177e4 LT |
600 | } |
601 | ||
9e443bc3 JH |
602 | static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry, |
603 | unsigned int flags) | |
1da177e4 LT |
604 | { |
605 | struct inode *inode; | |
606 | char *name; | |
607 | int err; | |
608 | ||
0a370e5d | 609 | inode = hostfs_iget(ino->i_sb); |
50f30740 | 610 | if (IS_ERR(inode)) |
1da177e4 LT |
611 | goto out; |
612 | ||
1da177e4 | 613 | err = -ENOMEM; |
c5322220 | 614 | name = dentry_name(dentry); |
50f30740 AV |
615 | if (name) { |
616 | err = read_name(inode, name); | |
617 | __putname(name); | |
618 | } | |
619 | if (err) { | |
1da177e4 | 620 | iput(inode); |
50f30740 | 621 | inode = (err == -ENOENT) ? NULL : ERR_PTR(err); |
1da177e4 | 622 | } |
1da177e4 | 623 | out: |
50f30740 | 624 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
625 | } |
626 | ||
9e443bc3 JH |
627 | static int hostfs_link(struct dentry *to, struct inode *ino, |
628 | struct dentry *from) | |
1da177e4 | 629 | { |
f1adc05e JD |
630 | char *from_name, *to_name; |
631 | int err; | |
1da177e4 | 632 | |
c5322220 | 633 | if ((from_name = dentry_name(from)) == NULL) |
f1adc05e | 634 | return -ENOMEM; |
c5322220 | 635 | to_name = dentry_name(to); |
84b3db04 | 636 | if (to_name == NULL) { |
e9193059 | 637 | __putname(from_name); |
f1adc05e | 638 | return -ENOMEM; |
1da177e4 | 639 | } |
f1adc05e | 640 | err = link_file(to_name, from_name); |
e9193059 AV |
641 | __putname(from_name); |
642 | __putname(to_name); | |
f1adc05e | 643 | return err; |
1da177e4 LT |
644 | } |
645 | ||
9e443bc3 | 646 | static int hostfs_unlink(struct inode *ino, struct dentry *dentry) |
1da177e4 LT |
647 | { |
648 | char *file; | |
649 | int err; | |
650 | ||
84b3db04 | 651 | if (append) |
f1adc05e | 652 | return -EPERM; |
1da177e4 | 653 | |
f8d7e187 AV |
654 | if ((file = dentry_name(dentry)) == NULL) |
655 | return -ENOMEM; | |
656 | ||
1da177e4 | 657 | err = unlink_file(file); |
e9193059 | 658 | __putname(file); |
f1adc05e | 659 | return err; |
1da177e4 LT |
660 | } |
661 | ||
7a77db95 | 662 | static int hostfs_symlink(struct mnt_idmap *idmap, struct inode *ino, |
549c7297 | 663 | struct dentry *dentry, const char *to) |
1da177e4 LT |
664 | { |
665 | char *file; | |
666 | int err; | |
667 | ||
c5322220 | 668 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 669 | return -ENOMEM; |
1da177e4 | 670 | err = make_symlink(file, to); |
e9193059 | 671 | __putname(file); |
f1adc05e | 672 | return err; |
1da177e4 LT |
673 | } |
674 | ||
c54bd91e | 675 | static int hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino, |
549c7297 | 676 | struct dentry *dentry, umode_t mode) |
1da177e4 LT |
677 | { |
678 | char *file; | |
679 | int err; | |
680 | ||
c5322220 | 681 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 682 | return -ENOMEM; |
1da177e4 | 683 | err = do_mkdir(file, mode); |
e9193059 | 684 | __putname(file); |
f1adc05e | 685 | return err; |
1da177e4 LT |
686 | } |
687 | ||
9e443bc3 | 688 | static int hostfs_rmdir(struct inode *ino, struct dentry *dentry) |
1da177e4 LT |
689 | { |
690 | char *file; | |
691 | int err; | |
692 | ||
c5322220 | 693 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 694 | return -ENOMEM; |
6380161c | 695 | err = hostfs_do_rmdir(file); |
e9193059 | 696 | __putname(file); |
f1adc05e | 697 | return err; |
1da177e4 LT |
698 | } |
699 | ||
5ebb29be | 700 | static int hostfs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 701 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
702 | { |
703 | struct inode *inode; | |
704 | char *name; | |
0a370e5d | 705 | int err; |
1da177e4 | 706 | |
0a370e5d DH |
707 | inode = hostfs_iget(dir->i_sb); |
708 | if (IS_ERR(inode)) { | |
709 | err = PTR_ERR(inode); | |
1da177e4 | 710 | goto out; |
0a370e5d | 711 | } |
1da177e4 | 712 | |
1da177e4 | 713 | err = -ENOMEM; |
c5322220 | 714 | name = dentry_name(dentry); |
84b3db04 | 715 | if (name == NULL) |
1da177e4 LT |
716 | goto out_put; |
717 | ||
88f6cd0c | 718 | err = do_mknod(name, mode, MAJOR(dev), MINOR(dev)); |
9f2dfda2 | 719 | if (err) |
1da177e4 LT |
720 | goto out_free; |
721 | ||
722 | err = read_name(inode, name); | |
e9193059 | 723 | __putname(name); |
5e2df28c AV |
724 | if (err) |
725 | goto out_put; | |
1da177e4 LT |
726 | |
727 | d_instantiate(dentry, inode); | |
f1adc05e | 728 | return 0; |
1da177e4 LT |
729 | |
730 | out_free: | |
e9193059 | 731 | __putname(name); |
1da177e4 LT |
732 | out_put: |
733 | iput(inode); | |
734 | out: | |
f1adc05e | 735 | return err; |
1da177e4 LT |
736 | } |
737 | ||
e18275ae | 738 | static int hostfs_rename2(struct mnt_idmap *idmap, |
549c7297 | 739 | struct inode *old_dir, struct dentry *old_dentry, |
9a423bb6 MS |
740 | struct inode *new_dir, struct dentry *new_dentry, |
741 | unsigned int flags) | |
1da177e4 | 742 | { |
9a423bb6 | 743 | char *old_name, *new_name; |
1da177e4 LT |
744 | int err; |
745 | ||
9a423bb6 MS |
746 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
747 | return -EINVAL; | |
748 | ||
749 | old_name = dentry_name(old_dentry); | |
750 | if (old_name == NULL) | |
f1adc05e | 751 | return -ENOMEM; |
9a423bb6 MS |
752 | new_name = dentry_name(new_dentry); |
753 | if (new_name == NULL) { | |
754 | __putname(old_name); | |
f1adc05e | 755 | return -ENOMEM; |
1da177e4 | 756 | } |
9a423bb6 MS |
757 | if (!flags) |
758 | err = rename_file(old_name, new_name); | |
759 | else | |
760 | err = rename2_file(old_name, new_name, flags); | |
761 | ||
762 | __putname(old_name); | |
763 | __putname(new_name); | |
f1adc05e | 764 | return err; |
1da177e4 LT |
765 | } |
766 | ||
4609e1f1 | 767 | static int hostfs_permission(struct mnt_idmap *idmap, |
549c7297 | 768 | struct inode *ino, int desired) |
1da177e4 LT |
769 | { |
770 | char *name; | |
771 | int r = 0, w = 0, x = 0, err; | |
772 | ||
10556cb2 | 773 | if (desired & MAY_NOT_BLOCK) |
b74c79e9 NP |
774 | return -ECHILD; |
775 | ||
1da177e4 LT |
776 | if (desired & MAY_READ) r = 1; |
777 | if (desired & MAY_WRITE) w = 1; | |
778 | if (desired & MAY_EXEC) x = 1; | |
c5322220 | 779 | name = inode_name(ino); |
f1adc05e JD |
780 | if (name == NULL) |
781 | return -ENOMEM; | |
1da177e4 LT |
782 | |
783 | if (S_ISCHR(ino->i_mode) || S_ISBLK(ino->i_mode) || | |
84b3db04 | 784 | S_ISFIFO(ino->i_mode) || S_ISSOCK(ino->i_mode)) |
1da177e4 LT |
785 | err = 0; |
786 | else | |
787 | err = access_file(name, r, w, x); | |
e9193059 | 788 | __putname(name); |
84b3db04 | 789 | if (!err) |
4609e1f1 | 790 | err = generic_permission(&nop_mnt_idmap, ino, desired); |
1da177e4 LT |
791 | return err; |
792 | } | |
793 | ||
c1632a0f | 794 | static int hostfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 795 | struct dentry *dentry, struct iattr *attr) |
1da177e4 | 796 | { |
2b0143b5 | 797 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
798 | struct hostfs_iattr attrs; |
799 | char *name; | |
800 | int err; | |
801 | ||
1025774c | 802 | int fd = HOSTFS_I(inode)->fd; |
5822b7fa | 803 | |
c1632a0f | 804 | err = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
1da177e4 LT |
805 | if (err) |
806 | return err; | |
807 | ||
84b3db04 | 808 | if (append) |
1da177e4 LT |
809 | attr->ia_valid &= ~ATTR_SIZE; |
810 | ||
811 | attrs.ia_valid = 0; | |
84b3db04 | 812 | if (attr->ia_valid & ATTR_MODE) { |
1da177e4 LT |
813 | attrs.ia_valid |= HOSTFS_ATTR_MODE; |
814 | attrs.ia_mode = attr->ia_mode; | |
815 | } | |
84b3db04 | 816 | if (attr->ia_valid & ATTR_UID) { |
1da177e4 | 817 | attrs.ia_valid |= HOSTFS_ATTR_UID; |
29f82ae5 | 818 | attrs.ia_uid = from_kuid(&init_user_ns, attr->ia_uid); |
1da177e4 | 819 | } |
84b3db04 | 820 | if (attr->ia_valid & ATTR_GID) { |
1da177e4 | 821 | attrs.ia_valid |= HOSTFS_ATTR_GID; |
29f82ae5 | 822 | attrs.ia_gid = from_kgid(&init_user_ns, attr->ia_gid); |
1da177e4 | 823 | } |
84b3db04 | 824 | if (attr->ia_valid & ATTR_SIZE) { |
1da177e4 LT |
825 | attrs.ia_valid |= HOSTFS_ATTR_SIZE; |
826 | attrs.ia_size = attr->ia_size; | |
827 | } | |
84b3db04 | 828 | if (attr->ia_valid & ATTR_ATIME) { |
1da177e4 | 829 | attrs.ia_valid |= HOSTFS_ATTR_ATIME; |
bca30265 AB |
830 | attrs.ia_atime = (struct hostfs_timespec) |
831 | { attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec }; | |
1da177e4 | 832 | } |
84b3db04 | 833 | if (attr->ia_valid & ATTR_MTIME) { |
1da177e4 | 834 | attrs.ia_valid |= HOSTFS_ATTR_MTIME; |
bca30265 AB |
835 | attrs.ia_mtime = (struct hostfs_timespec) |
836 | { attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec }; | |
1da177e4 | 837 | } |
84b3db04 | 838 | if (attr->ia_valid & ATTR_CTIME) { |
1da177e4 | 839 | attrs.ia_valid |= HOSTFS_ATTR_CTIME; |
bca30265 AB |
840 | attrs.ia_ctime = (struct hostfs_timespec) |
841 | { attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec }; | |
1da177e4 | 842 | } |
84b3db04 | 843 | if (attr->ia_valid & ATTR_ATIME_SET) { |
1da177e4 LT |
844 | attrs.ia_valid |= HOSTFS_ATTR_ATIME_SET; |
845 | } | |
84b3db04 | 846 | if (attr->ia_valid & ATTR_MTIME_SET) { |
1da177e4 LT |
847 | attrs.ia_valid |= HOSTFS_ATTR_MTIME_SET; |
848 | } | |
c5322220 | 849 | name = dentry_name(dentry); |
84b3db04 | 850 | if (name == NULL) |
f1adc05e | 851 | return -ENOMEM; |
5822b7fa | 852 | err = set_attr(name, &attrs, fd); |
e9193059 | 853 | __putname(name); |
84b3db04 | 854 | if (err) |
f1adc05e | 855 | return err; |
1da177e4 | 856 | |
1025774c | 857 | if ((attr->ia_valid & ATTR_SIZE) && |
bc077320 | 858 | attr->ia_size != i_size_read(inode)) |
3be2be0a | 859 | truncate_setsize(inode, attr->ia_size); |
1025774c | 860 | |
c1632a0f | 861 | setattr_copy(&nop_mnt_idmap, inode, attr); |
1025774c CH |
862 | mark_inode_dirty(inode); |
863 | return 0; | |
1da177e4 LT |
864 | } |
865 | ||
92e1d5be | 866 | static const struct inode_operations hostfs_iops = { |
1da177e4 LT |
867 | .permission = hostfs_permission, |
868 | .setattr = hostfs_setattr, | |
1da177e4 LT |
869 | }; |
870 | ||
92e1d5be | 871 | static const struct inode_operations hostfs_dir_iops = { |
1da177e4 LT |
872 | .create = hostfs_create, |
873 | .lookup = hostfs_lookup, | |
874 | .link = hostfs_link, | |
875 | .unlink = hostfs_unlink, | |
876 | .symlink = hostfs_symlink, | |
877 | .mkdir = hostfs_mkdir, | |
878 | .rmdir = hostfs_rmdir, | |
879 | .mknod = hostfs_mknod, | |
2773bf00 | 880 | .rename = hostfs_rename2, |
1da177e4 LT |
881 | .permission = hostfs_permission, |
882 | .setattr = hostfs_setattr, | |
1da177e4 LT |
883 | }; |
884 | ||
6b255391 | 885 | static const char *hostfs_get_link(struct dentry *dentry, |
fceef393 AV |
886 | struct inode *inode, |
887 | struct delayed_call *done) | |
d0352d3e | 888 | { |
6b255391 AV |
889 | char *link; |
890 | if (!dentry) | |
891 | return ERR_PTR(-ECHILD); | |
fceef393 | 892 | link = kmalloc(PATH_MAX, GFP_KERNEL); |
d0352d3e AV |
893 | if (link) { |
894 | char *path = dentry_name(dentry); | |
895 | int err = -ENOMEM; | |
896 | if (path) { | |
3b6036d1 | 897 | err = hostfs_do_readlink(path, link, PATH_MAX); |
d0352d3e AV |
898 | if (err == PATH_MAX) |
899 | err = -E2BIG; | |
e9193059 | 900 | __putname(path); |
d0352d3e AV |
901 | } |
902 | if (err < 0) { | |
fceef393 | 903 | kfree(link); |
680baacb | 904 | return ERR_PTR(err); |
d0352d3e AV |
905 | } |
906 | } else { | |
680baacb | 907 | return ERR_PTR(-ENOMEM); |
1da177e4 | 908 | } |
d0352d3e | 909 | |
fceef393 AV |
910 | set_delayed_call(done, kfree_link, link); |
911 | return link; | |
1da177e4 LT |
912 | } |
913 | ||
d0352d3e | 914 | static const struct inode_operations hostfs_link_iops = { |
6b255391 | 915 | .get_link = hostfs_get_link, |
1da177e4 LT |
916 | }; |
917 | ||
918 | static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) | |
919 | { | |
920 | struct inode *root_inode; | |
75e8defb | 921 | char *host_root_path, *req_root = d; |
1da177e4 LT |
922 | int err; |
923 | ||
924 | sb->s_blocksize = 1024; | |
925 | sb->s_blocksize_bits = 10; | |
926 | sb->s_magic = HOSTFS_SUPER_MAGIC; | |
927 | sb->s_op = &hostfs_sbops; | |
b26d4cd3 | 928 | sb->s_d_op = &simple_dentry_operations; |
752fa51e | 929 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
ce72750f SS |
930 | err = super_setup_bdi(sb); |
931 | if (err) | |
932 | goto out; | |
1da177e4 | 933 | |
b58c4e96 | 934 | /* NULL is printed as '(null)' by printf(): avoid that. */ |
75e8defb PBG |
935 | if (req_root == NULL) |
936 | req_root = ""; | |
1da177e4 LT |
937 | |
938 | err = -ENOMEM; | |
601d2c38 | 939 | sb->s_fs_info = host_root_path = |
b58c4e96 | 940 | kasprintf(GFP_KERNEL, "%s/%s", root_ino, req_root); |
84b3db04 | 941 | if (host_root_path == NULL) |
1da177e4 LT |
942 | goto out; |
943 | ||
52b209f7 AV |
944 | root_inode = new_inode(sb); |
945 | if (!root_inode) | |
601d2c38 | 946 | goto out; |
1da177e4 | 947 | |
4754b825 AV |
948 | err = read_name(root_inode, host_root_path); |
949 | if (err) | |
950 | goto out_put; | |
52b209f7 | 951 | |
4754b825 | 952 | if (S_ISLNK(root_inode->i_mode)) { |
52b209f7 | 953 | char *name = follow_link(host_root_path); |
8a545f18 | 954 | if (IS_ERR(name)) { |
52b209f7 | 955 | err = PTR_ERR(name); |
8a545f18 DC |
956 | goto out_put; |
957 | } | |
958 | err = read_name(root_inode, name); | |
52b209f7 | 959 | kfree(name); |
4754b825 AV |
960 | if (err) |
961 | goto out_put; | |
52b209f7 | 962 | } |
1da177e4 | 963 | |
1da177e4 | 964 | err = -ENOMEM; |
48fde701 | 965 | sb->s_root = d_make_root(root_inode); |
84b3db04 | 966 | if (sb->s_root == NULL) |
48fde701 | 967 | goto out; |
1da177e4 | 968 | |
f1adc05e | 969 | return 0; |
1da177e4 | 970 | |
f1adc05e JD |
971 | out_put: |
972 | iput(root_inode); | |
f1adc05e JD |
973 | out: |
974 | return err; | |
1da177e4 LT |
975 | } |
976 | ||
3c26ff6e | 977 | static struct dentry *hostfs_read_sb(struct file_system_type *type, |
454e2398 | 978 | int flags, const char *dev_name, |
3c26ff6e | 979 | void *data) |
1da177e4 | 980 | { |
3c26ff6e | 981 | return mount_nodev(type, flags, data, hostfs_fill_sb_common); |
1da177e4 LT |
982 | } |
983 | ||
601d2c38 AV |
984 | static void hostfs_kill_sb(struct super_block *s) |
985 | { | |
986 | kill_anon_super(s); | |
987 | kfree(s->s_fs_info); | |
988 | } | |
989 | ||
1da177e4 LT |
990 | static struct file_system_type hostfs_type = { |
991 | .owner = THIS_MODULE, | |
992 | .name = "hostfs", | |
3c26ff6e | 993 | .mount = hostfs_read_sb, |
601d2c38 | 994 | .kill_sb = hostfs_kill_sb, |
1da177e4 LT |
995 | .fs_flags = 0, |
996 | }; | |
3e64fe5b | 997 | MODULE_ALIAS_FS("hostfs"); |
1da177e4 LT |
998 | |
999 | static int __init init_hostfs(void) | |
1000 | { | |
a15f1e41 JB |
1001 | hostfs_inode_cache = KMEM_CACHE(hostfs_inode_info, 0); |
1002 | if (!hostfs_inode_cache) | |
1003 | return -ENOMEM; | |
f1adc05e | 1004 | return register_filesystem(&hostfs_type); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | static void __exit exit_hostfs(void) | |
1008 | { | |
1009 | unregister_filesystem(&hostfs_type); | |
a15f1e41 | 1010 | kmem_cache_destroy(hostfs_inode_cache); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | module_init(init_hostfs) | |
1014 | module_exit(exit_hostfs) | |
1015 | MODULE_LICENSE("GPL"); |