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; |
74ce793b | 29 | dev_t dev; |
1da177e4 LT |
30 | }; |
31 | ||
32 | static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode) | |
33 | { | |
f1adc05e | 34 | return list_entry(inode, struct hostfs_inode_info, vfs_inode); |
1da177e4 LT |
35 | } |
36 | ||
496ad9aa | 37 | #define FILE_HOSTFS_I(file) HOSTFS_I(file_inode(file)) |
1da177e4 | 38 | |
a15f1e41 JB |
39 | static struct kmem_cache *hostfs_inode_cache; |
40 | ||
1da177e4 | 41 | /* Changed in hostfs_args before the kernel starts running */ |
a6eb0be6 | 42 | static char *root_ino = ""; |
1da177e4 LT |
43 | static int append = 0; |
44 | ||
92e1d5be AV |
45 | static const struct inode_operations hostfs_iops; |
46 | static const struct inode_operations hostfs_dir_iops; | |
d0352d3e | 47 | static const struct inode_operations hostfs_link_iops; |
1da177e4 LT |
48 | |
49 | #ifndef MODULE | |
50 | static int __init hostfs_args(char *options, int *add) | |
51 | { | |
52 | char *ptr; | |
53 | ||
54 | ptr = strchr(options, ','); | |
84b3db04 | 55 | if (ptr != NULL) |
1da177e4 | 56 | *ptr++ = '\0'; |
84b3db04 | 57 | if (*options != '\0') |
1da177e4 LT |
58 | root_ino = options; |
59 | ||
60 | options = ptr; | |
84b3db04 | 61 | while (options) { |
1da177e4 | 62 | ptr = strchr(options, ','); |
84b3db04 | 63 | if (ptr != NULL) |
1da177e4 | 64 | *ptr++ = '\0'; |
84b3db04 JD |
65 | if (*options != '\0') { |
66 | if (!strcmp(options, "append")) | |
1da177e4 LT |
67 | append = 1; |
68 | else printf("hostfs_args - unsupported option - %s\n", | |
69 | options); | |
70 | } | |
71 | options = ptr; | |
72 | } | |
f1adc05e | 73 | return 0; |
1da177e4 LT |
74 | } |
75 | ||
76 | __uml_setup("hostfs=", hostfs_args, | |
77 | "hostfs=<root dir>,<flags>,...\n" | |
78 | " This is used to set hostfs parameters. The root directory argument\n" | |
79 | " is used to confine all hostfs mounts to within the specified directory\n" | |
80 | " tree on the host. If this isn't specified, then a user inside UML can\n" | |
81 | " mount anything on the host that's accessible to the user that's running\n" | |
82 | " it.\n" | |
83 | " The only flag currently supported is 'append', which specifies that all\n" | |
84 | " files opened by hostfs will be opened in append mode.\n\n" | |
85 | ); | |
86 | #endif | |
87 | ||
e9193059 | 88 | static char *__dentry_name(struct dentry *dentry, char *name) |
1da177e4 | 89 | { |
ec2447c2 | 90 | char *p = dentry_path_raw(dentry, name, PATH_MAX); |
e9193059 AV |
91 | char *root; |
92 | size_t len; | |
1da177e4 | 93 | |
e9193059 AV |
94 | root = dentry->d_sb->s_fs_info; |
95 | len = strlen(root); | |
96 | if (IS_ERR(p)) { | |
97 | __putname(name); | |
f1adc05e | 98 | return NULL; |
1da177e4 | 99 | } |
aad50b1e RW |
100 | |
101 | /* | |
102 | * This function relies on the fact that dentry_path_raw() will place | |
103 | * the path name at the end of the provided buffer. | |
104 | */ | |
105 | BUG_ON(p + strlen(p) + 1 != name + PATH_MAX); | |
106 | ||
b7f28a37 | 107 | strscpy(name, root, PATH_MAX); |
e9193059 AV |
108 | if (len > p - name) { |
109 | __putname(name); | |
110 | return NULL; | |
111 | } | |
c278e81b RW |
112 | |
113 | if (p > name + len) | |
114 | strcpy(name + len, p); | |
115 | ||
f1adc05e | 116 | return name; |
1da177e4 LT |
117 | } |
118 | ||
e9193059 AV |
119 | static char *dentry_name(struct dentry *dentry) |
120 | { | |
121 | char *name = __getname(); | |
122 | if (!name) | |
123 | return NULL; | |
124 | ||
9dcc5e8a | 125 | return __dentry_name(dentry, name); |
e9193059 AV |
126 | } |
127 | ||
c5322220 | 128 | static char *inode_name(struct inode *ino) |
1da177e4 LT |
129 | { |
130 | struct dentry *dentry; | |
ec2447c2 | 131 | char *name; |
1da177e4 | 132 | |
ec2447c2 NP |
133 | dentry = d_find_alias(ino); |
134 | if (!dentry) | |
e9193059 | 135 | return NULL; |
ec2447c2 NP |
136 | |
137 | name = dentry_name(dentry); | |
138 | ||
139 | dput(dentry); | |
140 | ||
141 | return name; | |
1da177e4 LT |
142 | } |
143 | ||
1da177e4 LT |
144 | static char *follow_link(char *link) |
145 | { | |
1da177e4 | 146 | char *name, *resolved, *end; |
b58c4e96 | 147 | int n; |
1da177e4 | 148 | |
7f6c411c | 149 | name = kmalloc(PATH_MAX, GFP_KERNEL); |
7c950992 | 150 | if (!name) { |
1da177e4 | 151 | n = -ENOMEM; |
7c950992 | 152 | goto out_free; |
1da177e4 | 153 | } |
7c950992 RW |
154 | |
155 | n = hostfs_do_readlink(link, name, PATH_MAX); | |
84b3db04 | 156 | if (n < 0) |
1da177e4 | 157 | goto out_free; |
7c950992 RW |
158 | else if (n == PATH_MAX) { |
159 | n = -E2BIG; | |
160 | goto out_free; | |
161 | } | |
1da177e4 | 162 | |
84b3db04 | 163 | if (*name == '/') |
f1adc05e | 164 | return name; |
1da177e4 LT |
165 | |
166 | end = strrchr(link, '/'); | |
84b3db04 | 167 | if (end == NULL) |
f1adc05e | 168 | return name; |
1da177e4 LT |
169 | |
170 | *(end + 1) = '\0'; | |
1da177e4 | 171 | |
b58c4e96 | 172 | resolved = kasprintf(GFP_KERNEL, "%s%s", link, name); |
84b3db04 | 173 | if (resolved == NULL) { |
1da177e4 LT |
174 | n = -ENOMEM; |
175 | goto out_free; | |
176 | } | |
177 | ||
7f6c411c | 178 | kfree(name); |
f1adc05e | 179 | return resolved; |
1da177e4 LT |
180 | |
181 | out_free: | |
7f6c411c | 182 | kfree(name); |
f1adc05e | 183 | return ERR_PTR(n); |
1da177e4 LT |
184 | } |
185 | ||
9e443bc3 | 186 | static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf) |
1da177e4 | 187 | { |
84b3db04 JD |
188 | /* |
189 | * do_statfs uses struct statfs64 internally, but the linux kernel | |
1da177e4 LT |
190 | * struct statfs still has 32-bit versions for most of these fields, |
191 | * so we convert them here | |
192 | */ | |
193 | int err; | |
194 | long long f_blocks; | |
195 | long long f_bfree; | |
196 | long long f_bavail; | |
197 | long long f_files; | |
198 | long long f_ffree; | |
199 | ||
601d2c38 | 200 | err = do_statfs(dentry->d_sb->s_fs_info, |
1da177e4 LT |
201 | &sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files, |
202 | &f_ffree, &sf->f_fsid, sizeof(sf->f_fsid), | |
1b627d57 | 203 | &sf->f_namelen); |
84b3db04 | 204 | if (err) |
f1adc05e | 205 | return err; |
1da177e4 LT |
206 | sf->f_blocks = f_blocks; |
207 | sf->f_bfree = f_bfree; | |
208 | sf->f_bavail = f_bavail; | |
209 | sf->f_files = f_files; | |
210 | sf->f_ffree = f_ffree; | |
211 | sf->f_type = HOSTFS_SUPER_MAGIC; | |
f1adc05e | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
215 | static struct inode *hostfs_alloc_inode(struct super_block *sb) | |
216 | { | |
217 | struct hostfs_inode_info *hi; | |
218 | ||
fd60b288 | 219 | hi = alloc_inode_sb(sb, hostfs_inode_cache, GFP_KERNEL_ACCOUNT); |
84b3db04 | 220 | if (hi == NULL) |
f1adc05e | 221 | return NULL; |
601d2c38 | 222 | hi->fd = -1; |
371fdab1 | 223 | hi->mode = 0; |
74ce793b | 224 | hi->dev = 0; |
1da177e4 | 225 | inode_init_once(&hi->vfs_inode); |
69886e67 | 226 | mutex_init(&hi->open_mutex); |
f1adc05e | 227 | return &hi->vfs_inode; |
1da177e4 LT |
228 | } |
229 | ||
e971a6d7 | 230 | static void hostfs_evict_inode(struct inode *inode) |
1da177e4 | 231 | { |
91b0abe3 | 232 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 233 | clear_inode(inode); |
84b3db04 | 234 | if (HOSTFS_I(inode)->fd != -1) { |
1da177e4 LT |
235 | close_file(&HOSTFS_I(inode)->fd); |
236 | HOSTFS_I(inode)->fd = -1; | |
74ce793b | 237 | HOSTFS_I(inode)->dev = 0; |
1da177e4 | 238 | } |
1da177e4 LT |
239 | } |
240 | ||
08ccfc5c | 241 | static void hostfs_free_inode(struct inode *inode) |
1da177e4 | 242 | { |
a15f1e41 | 243 | kmem_cache_free(hostfs_inode_cache, HOSTFS_I(inode)); |
1da177e4 | 244 | } |
fa0d7e3d | 245 | |
34c80b1d | 246 | static int hostfs_show_options(struct seq_file *seq, struct dentry *root) |
dd2cc4df | 247 | { |
34c80b1d | 248 | const char *root_path = root->d_sb->s_fs_info; |
dd2cc4df MS |
249 | size_t offset = strlen(root_ino) + 1; |
250 | ||
251 | if (strlen(root_path) > offset) | |
a068acf2 | 252 | seq_show_option(seq, root_path + offset, NULL); |
dd2cc4df | 253 | |
7f74a668 RW |
254 | if (append) |
255 | seq_puts(seq, ",append"); | |
256 | ||
dd2cc4df MS |
257 | return 0; |
258 | } | |
259 | ||
ee9b6d61 | 260 | static const struct super_operations hostfs_sbops = { |
1da177e4 | 261 | .alloc_inode = hostfs_alloc_inode, |
08ccfc5c | 262 | .free_inode = hostfs_free_inode, |
74ce793b | 263 | .drop_inode = generic_delete_inode, |
e971a6d7 | 264 | .evict_inode = hostfs_evict_inode, |
1da177e4 | 265 | .statfs = hostfs_statfs, |
dd2cc4df | 266 | .show_options = hostfs_show_options, |
1da177e4 LT |
267 | }; |
268 | ||
9e443bc3 | 269 | static int hostfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 LT |
270 | { |
271 | void *dir; | |
272 | char *name; | |
273 | unsigned long long next, ino; | |
274 | int error, len; | |
3ee6bd8e | 275 | unsigned int type; |
1da177e4 | 276 | |
c5322220 | 277 | name = dentry_name(file->f_path.dentry); |
84b3db04 | 278 | if (name == NULL) |
f1adc05e | 279 | return -ENOMEM; |
1da177e4 | 280 | dir = open_dir(name, &error); |
e9193059 | 281 | __putname(name); |
84b3db04 | 282 | if (dir == NULL) |
f1adc05e | 283 | return -error; |
8e28bc7e | 284 | next = ctx->pos; |
0c9bd636 | 285 | seek_dir(dir, next); |
3ee6bd8e | 286 | while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) { |
8e28bc7e AV |
287 | if (!dir_emit(ctx, name, len, ino, type)) |
288 | break; | |
289 | ctx->pos = next; | |
1da177e4 LT |
290 | } |
291 | close_dir(dir); | |
f1adc05e | 292 | return 0; |
1da177e4 LT |
293 | } |
294 | ||
4c6dcafc | 295 | static int hostfs_open(struct inode *ino, struct file *file) |
1da177e4 LT |
296 | { |
297 | char *name; | |
bd1052a2 | 298 | fmode_t mode; |
f8ad850f | 299 | int err; |
bd1052a2 | 300 | int r, w, fd; |
1da177e4 LT |
301 | |
302 | mode = file->f_mode & (FMODE_READ | FMODE_WRITE); | |
84b3db04 | 303 | if ((mode & HOSTFS_I(ino)->mode) == mode) |
f1adc05e | 304 | return 0; |
1da177e4 | 305 | |
f8ad850f | 306 | mode |= HOSTFS_I(ino)->mode; |
1da177e4 | 307 | |
f8ad850f | 308 | retry: |
a9d1958b RW |
309 | r = w = 0; |
310 | ||
f8ad850f | 311 | if (mode & FMODE_READ) |
1da177e4 | 312 | r = 1; |
f8ad850f | 313 | if (mode & FMODE_WRITE) |
112a5da7 | 314 | r = w = 1; |
1da177e4 | 315 | |
d692d397 | 316 | name = dentry_name(file_dentry(file)); |
84b3db04 | 317 | if (name == NULL) |
f1adc05e | 318 | return -ENOMEM; |
1da177e4 LT |
319 | |
320 | fd = open_file(name, r, w, append); | |
e9193059 | 321 | __putname(name); |
84b3db04 | 322 | if (fd < 0) |
f1adc05e | 323 | return fd; |
f8ad850f | 324 | |
69886e67 | 325 | mutex_lock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
326 | /* somebody else had handled it first? */ |
327 | if ((mode & HOSTFS_I(ino)->mode) == mode) { | |
69886e67 | 328 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
af955658 | 329 | close_file(&fd); |
f8ad850f AV |
330 | return 0; |
331 | } | |
332 | if ((mode | HOSTFS_I(ino)->mode) != mode) { | |
333 | mode |= HOSTFS_I(ino)->mode; | |
69886e67 | 334 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
335 | close_file(&fd); |
336 | goto retry; | |
337 | } | |
338 | if (HOSTFS_I(ino)->fd == -1) { | |
339 | HOSTFS_I(ino)->fd = fd; | |
340 | } else { | |
341 | err = replace_file(fd, HOSTFS_I(ino)->fd); | |
342 | close_file(&fd); | |
343 | if (err < 0) { | |
69886e67 | 344 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
f8ad850f AV |
345 | return err; |
346 | } | |
347 | } | |
348 | HOSTFS_I(ino)->mode = mode; | |
69886e67 | 349 | mutex_unlock(&HOSTFS_I(ino)->open_mutex); |
1da177e4 | 350 | |
f1adc05e | 351 | return 0; |
1da177e4 LT |
352 | } |
353 | ||
65984ff9 RW |
354 | static int hostfs_file_release(struct inode *inode, struct file *file) |
355 | { | |
356 | filemap_write_and_wait(inode->i_mapping); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
9e443bc3 JH |
361 | static int hostfs_fsync(struct file *file, loff_t start, loff_t end, |
362 | int datasync) | |
1da177e4 | 363 | { |
02c24a82 JB |
364 | struct inode *inode = file->f_mapping->host; |
365 | int ret; | |
366 | ||
3b49c9a1 | 367 | ret = file_write_and_wait_range(file, start, end); |
02c24a82 JB |
368 | if (ret) |
369 | return ret; | |
370 | ||
5955102c | 371 | inode_lock(inode); |
02c24a82 | 372 | ret = fsync_file(HOSTFS_I(inode)->fd, datasync); |
5955102c | 373 | inode_unlock(inode); |
02c24a82 JB |
374 | |
375 | return ret; | |
1da177e4 LT |
376 | } |
377 | ||
4b6f5d20 | 378 | static const struct file_operations hostfs_file_fops = { |
1da177e4 | 379 | .llseek = generic_file_llseek, |
2cb1e089 | 380 | .splice_read = filemap_splice_read, |
1568cb0e | 381 | .splice_write = iter_file_splice_write, |
aad4f8bb | 382 | .read_iter = generic_file_read_iter, |
8174202b | 383 | .write_iter = generic_file_write_iter, |
1da177e4 | 384 | .mmap = generic_file_mmap, |
4c6dcafc | 385 | .open = hostfs_open, |
65984ff9 | 386 | .release = hostfs_file_release, |
1da177e4 LT |
387 | .fsync = hostfs_fsync, |
388 | }; | |
389 | ||
4b6f5d20 | 390 | static const struct file_operations hostfs_dir_fops = { |
1da177e4 | 391 | .llseek = generic_file_llseek, |
552a9d48 | 392 | .iterate_shared = hostfs_readdir, |
1da177e4 | 393 | .read = generic_read_dir, |
4c6dcafc RW |
394 | .open = hostfs_open, |
395 | .fsync = hostfs_fsync, | |
1da177e4 LT |
396 | }; |
397 | ||
9e443bc3 | 398 | static int hostfs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
399 | { |
400 | struct address_space *mapping = page->mapping; | |
401 | struct inode *inode = mapping->host; | |
402 | char *buffer; | |
af6aa1b9 | 403 | loff_t base = page_offset(page); |
09cbfeaf KS |
404 | int count = PAGE_SIZE; |
405 | int end_index = inode->i_size >> PAGE_SHIFT; | |
1da177e4 LT |
406 | int err; |
407 | ||
408 | if (page->index >= end_index) | |
09cbfeaf | 409 | count = inode->i_size & (PAGE_SIZE-1); |
1da177e4 | 410 | |
e0820368 | 411 | buffer = kmap_local_page(page); |
1da177e4 LT |
412 | |
413 | err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count); | |
84b3db04 | 414 | if (err != count) { |
e775dfb3 MWO |
415 | if (err >= 0) |
416 | err = -EIO; | |
417 | mapping_set_error(mapping, err); | |
1da177e4 LT |
418 | goto out; |
419 | } | |
420 | ||
421 | if (base > inode->i_size) | |
422 | inode->i_size = base; | |
423 | ||
1da177e4 LT |
424 | err = 0; |
425 | ||
426 | out: | |
e0820368 | 427 | kunmap_local(buffer); |
1da177e4 | 428 | unlock_page(page); |
e0820368 | 429 | |
1da177e4 LT |
430 | return err; |
431 | } | |
432 | ||
8f4fe249 | 433 | static int hostfs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 434 | { |
8f4fe249 | 435 | struct page *page = &folio->page; |
1da177e4 | 436 | char *buffer; |
af6aa1b9 | 437 | loff_t start = page_offset(page); |
b86b413a | 438 | int bytes_read, ret = 0; |
1da177e4 | 439 | |
e0820368 | 440 | buffer = kmap_local_page(page); |
41761ddf | 441 | bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer, |
09cbfeaf | 442 | PAGE_SIZE); |
41761ddf | 443 | if (bytes_read < 0) { |
b86b413a RW |
444 | ClearPageUptodate(page); |
445 | SetPageError(page); | |
41761ddf | 446 | ret = bytes_read; |
84b3db04 | 447 | goto out; |
41761ddf | 448 | } |
1da177e4 | 449 | |
09cbfeaf | 450 | memset(buffer + bytes_read, 0, PAGE_SIZE - bytes_read); |
1da177e4 | 451 | |
b86b413a | 452 | ClearPageError(page); |
1da177e4 | 453 | SetPageUptodate(page); |
b86b413a | 454 | |
1da177e4 | 455 | out: |
b86b413a | 456 | flush_dcache_page(page); |
e0820368 | 457 | kunmap_local(buffer); |
1da177e4 | 458 | unlock_page(page); |
e0820368 | 459 | |
41761ddf | 460 | return ret; |
1da177e4 LT |
461 | } |
462 | ||
9e443bc3 | 463 | static int hostfs_write_begin(struct file *file, struct address_space *mapping, |
9d6b0cd7 | 464 | loff_t pos, unsigned len, |
9e443bc3 | 465 | struct page **pagep, void **fsdata) |
1da177e4 | 466 | { |
09cbfeaf | 467 | pgoff_t index = pos >> PAGE_SHIFT; |
1da177e4 | 468 | |
b7446e7c | 469 | *pagep = grab_cache_page_write_begin(mapping, index); |
ae361ff4 NP |
470 | if (!*pagep) |
471 | return -ENOMEM; | |
472 | return 0; | |
1da177e4 LT |
473 | } |
474 | ||
9e443bc3 JH |
475 | static int hostfs_write_end(struct file *file, struct address_space *mapping, |
476 | loff_t pos, unsigned len, unsigned copied, | |
477 | struct page *page, void *fsdata) | |
1da177e4 | 478 | { |
1da177e4 | 479 | struct inode *inode = mapping->host; |
ae361ff4 | 480 | void *buffer; |
09cbfeaf | 481 | unsigned from = pos & (PAGE_SIZE - 1); |
ae361ff4 | 482 | int err; |
1da177e4 | 483 | |
e0820368 | 484 | buffer = kmap_local_page(page); |
ae361ff4 | 485 | err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer + from, copied); |
e0820368 | 486 | kunmap_local(buffer); |
30f04a4e | 487 | |
09cbfeaf | 488 | if (!PageUptodate(page) && err == PAGE_SIZE) |
ae361ff4 | 489 | SetPageUptodate(page); |
30f04a4e | 490 | |
84b3db04 JD |
491 | /* |
492 | * If err > 0, write_file has added err to pos, so we are comparing | |
ae361ff4 NP |
493 | * i_size against the last byte written. |
494 | */ | |
495 | if (err > 0 && (pos > inode->i_size)) | |
496 | inode->i_size = pos; | |
497 | unlock_page(page); | |
09cbfeaf | 498 | put_page(page); |
1da177e4 | 499 | |
f1adc05e | 500 | return err; |
1da177e4 LT |
501 | } |
502 | ||
f5e54d6e | 503 | static const struct address_space_operations hostfs_aops = { |
1da177e4 | 504 | .writepage = hostfs_writepage, |
8f4fe249 | 505 | .read_folio = hostfs_read_folio, |
187c82cb | 506 | .dirty_folio = filemap_dirty_folio, |
ae361ff4 NP |
507 | .write_begin = hostfs_write_begin, |
508 | .write_end = hostfs_write_end, | |
1da177e4 LT |
509 | }; |
510 | ||
74ce793b MS |
511 | static int hostfs_inode_update(struct inode *ino, const struct hostfs_stat *st) |
512 | { | |
513 | set_nlink(ino, st->nlink); | |
514 | i_uid_write(ino, st->uid); | |
515 | i_gid_write(ino, st->gid); | |
c461ba5d JL |
516 | inode_set_atime_to_ts(ino, (struct timespec64){ |
517 | st->atime.tv_sec, | |
518 | st->atime.tv_nsec, | |
519 | }); | |
520 | inode_set_mtime_to_ts(ino, (struct timespec64){ | |
521 | st->mtime.tv_sec, | |
522 | st->mtime.tv_nsec, | |
523 | }); | |
66e79d89 | 524 | inode_set_ctime(ino, st->ctime.tv_sec, st->ctime.tv_nsec); |
74ce793b MS |
525 | ino->i_size = st->size; |
526 | ino->i_blocks = st->blocks; | |
527 | return 0; | |
528 | } | |
529 | ||
530 | static int hostfs_inode_set(struct inode *ino, void *data) | |
1da177e4 | 531 | { |
74ce793b | 532 | struct hostfs_stat *st = data; |
4754b825 | 533 | dev_t rdev; |
1da177e4 | 534 | |
5e2df28c | 535 | /* Reencode maj and min with the kernel encoding.*/ |
74ce793b | 536 | rdev = MKDEV(st->maj, st->min); |
1da177e4 | 537 | |
74ce793b | 538 | switch (st->mode & S_IFMT) { |
4754b825 | 539 | case S_IFLNK: |
d0352d3e | 540 | ino->i_op = &hostfs_link_iops; |
1da177e4 | 541 | break; |
4754b825 AV |
542 | case S_IFDIR: |
543 | ino->i_op = &hostfs_dir_iops; | |
544 | ino->i_fop = &hostfs_dir_fops; | |
1da177e4 | 545 | break; |
4754b825 AV |
546 | case S_IFCHR: |
547 | case S_IFBLK: | |
548 | case S_IFIFO: | |
549 | case S_IFSOCK: | |
74ce793b | 550 | init_special_inode(ino, st->mode & S_IFMT, rdev); |
4754b825 | 551 | ino->i_op = &hostfs_iops; |
1da177e4 | 552 | break; |
2ad2dca6 | 553 | case S_IFREG: |
4754b825 AV |
554 | ino->i_op = &hostfs_iops; |
555 | ino->i_fop = &hostfs_file_fops; | |
556 | ino->i_mapping->a_ops = &hostfs_aops; | |
2ad2dca6 RW |
557 | break; |
558 | default: | |
559 | return -EIO; | |
1da177e4 | 560 | } |
4754b825 | 561 | |
74ce793b MS |
562 | HOSTFS_I(ino)->dev = st->dev; |
563 | ino->i_ino = st->ino; | |
564 | ino->i_mode = st->mode; | |
565 | return hostfs_inode_update(ino, st); | |
566 | } | |
567 | ||
568 | static int hostfs_inode_test(struct inode *inode, void *data) | |
569 | { | |
570 | const struct hostfs_stat *st = data; | |
571 | ||
572 | return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == st->dev; | |
573 | } | |
574 | ||
575 | static struct inode *hostfs_iget(struct super_block *sb, char *name) | |
576 | { | |
577 | struct inode *inode; | |
578 | struct hostfs_stat st; | |
579 | int err = stat_file(name, &st, -1); | |
580 | ||
581 | if (err) | |
582 | return ERR_PTR(err); | |
583 | ||
584 | inode = iget5_locked(sb, st.ino, hostfs_inode_test, hostfs_inode_set, | |
585 | &st); | |
586 | if (!inode) | |
587 | return ERR_PTR(-ENOMEM); | |
588 | ||
589 | if (inode->i_state & I_NEW) { | |
590 | unlock_new_inode(inode); | |
591 | } else { | |
592 | spin_lock(&inode->i_lock); | |
593 | hostfs_inode_update(inode, &st); | |
594 | spin_unlock(&inode->i_lock); | |
595 | } | |
596 | ||
597 | return inode; | |
1da177e4 LT |
598 | } |
599 | ||
6c960e68 | 600 | static int hostfs_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 601 | struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
602 | { |
603 | struct inode *inode; | |
604 | char *name; | |
74ce793b | 605 | int fd; |
1da177e4 | 606 | |
c5322220 | 607 | name = dentry_name(dentry); |
84b3db04 | 608 | if (name == NULL) |
74ce793b | 609 | return -ENOMEM; |
1da177e4 | 610 | |
a718c922 | 611 | fd = file_create(name, mode & 0777); |
74ce793b MS |
612 | if (fd < 0) { |
613 | __putname(name); | |
614 | return fd; | |
615 | } | |
1da177e4 | 616 | |
74ce793b | 617 | inode = hostfs_iget(dir->i_sb, name); |
e9193059 | 618 | __putname(name); |
74ce793b MS |
619 | if (IS_ERR(inode)) |
620 | return PTR_ERR(inode); | |
1da177e4 LT |
621 | |
622 | HOSTFS_I(inode)->fd = fd; | |
623 | HOSTFS_I(inode)->mode = FMODE_READ | FMODE_WRITE; | |
624 | d_instantiate(dentry, inode); | |
f1adc05e | 625 | return 0; |
1da177e4 LT |
626 | } |
627 | ||
9e443bc3 JH |
628 | static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry, |
629 | unsigned int flags) | |
1da177e4 | 630 | { |
74ce793b | 631 | struct inode *inode = NULL; |
1da177e4 | 632 | char *name; |
1da177e4 | 633 | |
c5322220 | 634 | name = dentry_name(dentry); |
74ce793b MS |
635 | if (name == NULL) |
636 | return ERR_PTR(-ENOMEM); | |
637 | ||
638 | inode = hostfs_iget(ino->i_sb, name); | |
639 | __putname(name); | |
6f36230e AV |
640 | if (inode == ERR_PTR(-ENOENT)) |
641 | inode = NULL; | |
74ce793b | 642 | |
50f30740 | 643 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
644 | } |
645 | ||
9e443bc3 JH |
646 | static int hostfs_link(struct dentry *to, struct inode *ino, |
647 | struct dentry *from) | |
1da177e4 | 648 | { |
f1adc05e JD |
649 | char *from_name, *to_name; |
650 | int err; | |
1da177e4 | 651 | |
c5322220 | 652 | if ((from_name = dentry_name(from)) == NULL) |
f1adc05e | 653 | return -ENOMEM; |
c5322220 | 654 | to_name = dentry_name(to); |
84b3db04 | 655 | if (to_name == NULL) { |
e9193059 | 656 | __putname(from_name); |
f1adc05e | 657 | return -ENOMEM; |
1da177e4 | 658 | } |
f1adc05e | 659 | err = link_file(to_name, from_name); |
e9193059 AV |
660 | __putname(from_name); |
661 | __putname(to_name); | |
f1adc05e | 662 | return err; |
1da177e4 LT |
663 | } |
664 | ||
9e443bc3 | 665 | static int hostfs_unlink(struct inode *ino, struct dentry *dentry) |
1da177e4 LT |
666 | { |
667 | char *file; | |
668 | int err; | |
669 | ||
84b3db04 | 670 | if (append) |
f1adc05e | 671 | return -EPERM; |
1da177e4 | 672 | |
f8d7e187 AV |
673 | if ((file = dentry_name(dentry)) == NULL) |
674 | return -ENOMEM; | |
675 | ||
1da177e4 | 676 | err = unlink_file(file); |
e9193059 | 677 | __putname(file); |
f1adc05e | 678 | return err; |
1da177e4 LT |
679 | } |
680 | ||
7a77db95 | 681 | static int hostfs_symlink(struct mnt_idmap *idmap, struct inode *ino, |
549c7297 | 682 | struct dentry *dentry, const char *to) |
1da177e4 LT |
683 | { |
684 | char *file; | |
685 | int err; | |
686 | ||
c5322220 | 687 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 688 | return -ENOMEM; |
1da177e4 | 689 | err = make_symlink(file, to); |
e9193059 | 690 | __putname(file); |
f1adc05e | 691 | return err; |
1da177e4 LT |
692 | } |
693 | ||
c54bd91e | 694 | static int hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino, |
549c7297 | 695 | struct dentry *dentry, umode_t mode) |
1da177e4 LT |
696 | { |
697 | char *file; | |
698 | int err; | |
699 | ||
c5322220 | 700 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 701 | return -ENOMEM; |
1da177e4 | 702 | err = do_mkdir(file, mode); |
e9193059 | 703 | __putname(file); |
f1adc05e | 704 | return err; |
1da177e4 LT |
705 | } |
706 | ||
9e443bc3 | 707 | static int hostfs_rmdir(struct inode *ino, struct dentry *dentry) |
1da177e4 LT |
708 | { |
709 | char *file; | |
710 | int err; | |
711 | ||
c5322220 | 712 | if ((file = dentry_name(dentry)) == NULL) |
f1adc05e | 713 | return -ENOMEM; |
6380161c | 714 | err = hostfs_do_rmdir(file); |
e9193059 | 715 | __putname(file); |
f1adc05e | 716 | return err; |
1da177e4 LT |
717 | } |
718 | ||
5ebb29be | 719 | static int hostfs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 720 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
721 | { |
722 | struct inode *inode; | |
723 | char *name; | |
0a370e5d | 724 | int err; |
1da177e4 | 725 | |
c5322220 | 726 | name = dentry_name(dentry); |
84b3db04 | 727 | if (name == NULL) |
74ce793b | 728 | return -ENOMEM; |
1da177e4 | 729 | |
88f6cd0c | 730 | err = do_mknod(name, mode, MAJOR(dev), MINOR(dev)); |
74ce793b MS |
731 | if (err) { |
732 | __putname(name); | |
733 | return err; | |
734 | } | |
1da177e4 | 735 | |
74ce793b | 736 | inode = hostfs_iget(dir->i_sb, name); |
e9193059 | 737 | __putname(name); |
74ce793b MS |
738 | if (IS_ERR(inode)) |
739 | return PTR_ERR(inode); | |
1da177e4 LT |
740 | |
741 | d_instantiate(dentry, inode); | |
f1adc05e | 742 | return 0; |
1da177e4 LT |
743 | } |
744 | ||
e18275ae | 745 | static int hostfs_rename2(struct mnt_idmap *idmap, |
549c7297 | 746 | struct inode *old_dir, struct dentry *old_dentry, |
9a423bb6 MS |
747 | struct inode *new_dir, struct dentry *new_dentry, |
748 | unsigned int flags) | |
1da177e4 | 749 | { |
9a423bb6 | 750 | char *old_name, *new_name; |
1da177e4 LT |
751 | int err; |
752 | ||
9a423bb6 MS |
753 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
754 | return -EINVAL; | |
755 | ||
756 | old_name = dentry_name(old_dentry); | |
757 | if (old_name == NULL) | |
f1adc05e | 758 | return -ENOMEM; |
9a423bb6 MS |
759 | new_name = dentry_name(new_dentry); |
760 | if (new_name == NULL) { | |
761 | __putname(old_name); | |
f1adc05e | 762 | return -ENOMEM; |
1da177e4 | 763 | } |
9a423bb6 MS |
764 | if (!flags) |
765 | err = rename_file(old_name, new_name); | |
766 | else | |
767 | err = rename2_file(old_name, new_name, flags); | |
768 | ||
769 | __putname(old_name); | |
770 | __putname(new_name); | |
f1adc05e | 771 | return err; |
1da177e4 LT |
772 | } |
773 | ||
4609e1f1 | 774 | static int hostfs_permission(struct mnt_idmap *idmap, |
549c7297 | 775 | struct inode *ino, int desired) |
1da177e4 LT |
776 | { |
777 | char *name; | |
778 | int r = 0, w = 0, x = 0, err; | |
779 | ||
10556cb2 | 780 | if (desired & MAY_NOT_BLOCK) |
b74c79e9 NP |
781 | return -ECHILD; |
782 | ||
1da177e4 LT |
783 | if (desired & MAY_READ) r = 1; |
784 | if (desired & MAY_WRITE) w = 1; | |
785 | if (desired & MAY_EXEC) x = 1; | |
c5322220 | 786 | name = inode_name(ino); |
f1adc05e JD |
787 | if (name == NULL) |
788 | return -ENOMEM; | |
1da177e4 LT |
789 | |
790 | if (S_ISCHR(ino->i_mode) || S_ISBLK(ino->i_mode) || | |
84b3db04 | 791 | S_ISFIFO(ino->i_mode) || S_ISSOCK(ino->i_mode)) |
1da177e4 LT |
792 | err = 0; |
793 | else | |
794 | err = access_file(name, r, w, x); | |
e9193059 | 795 | __putname(name); |
84b3db04 | 796 | if (!err) |
4609e1f1 | 797 | err = generic_permission(&nop_mnt_idmap, ino, desired); |
1da177e4 LT |
798 | return err; |
799 | } | |
800 | ||
c1632a0f | 801 | static int hostfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 802 | struct dentry *dentry, struct iattr *attr) |
1da177e4 | 803 | { |
2b0143b5 | 804 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
805 | struct hostfs_iattr attrs; |
806 | char *name; | |
807 | int err; | |
808 | ||
1025774c | 809 | int fd = HOSTFS_I(inode)->fd; |
5822b7fa | 810 | |
c1632a0f | 811 | err = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
1da177e4 LT |
812 | if (err) |
813 | return err; | |
814 | ||
84b3db04 | 815 | if (append) |
1da177e4 LT |
816 | attr->ia_valid &= ~ATTR_SIZE; |
817 | ||
818 | attrs.ia_valid = 0; | |
84b3db04 | 819 | if (attr->ia_valid & ATTR_MODE) { |
1da177e4 LT |
820 | attrs.ia_valid |= HOSTFS_ATTR_MODE; |
821 | attrs.ia_mode = attr->ia_mode; | |
822 | } | |
84b3db04 | 823 | if (attr->ia_valid & ATTR_UID) { |
1da177e4 | 824 | attrs.ia_valid |= HOSTFS_ATTR_UID; |
29f82ae5 | 825 | attrs.ia_uid = from_kuid(&init_user_ns, attr->ia_uid); |
1da177e4 | 826 | } |
84b3db04 | 827 | if (attr->ia_valid & ATTR_GID) { |
1da177e4 | 828 | attrs.ia_valid |= HOSTFS_ATTR_GID; |
29f82ae5 | 829 | attrs.ia_gid = from_kgid(&init_user_ns, attr->ia_gid); |
1da177e4 | 830 | } |
84b3db04 | 831 | if (attr->ia_valid & ATTR_SIZE) { |
1da177e4 LT |
832 | attrs.ia_valid |= HOSTFS_ATTR_SIZE; |
833 | attrs.ia_size = attr->ia_size; | |
834 | } | |
84b3db04 | 835 | if (attr->ia_valid & ATTR_ATIME) { |
1da177e4 | 836 | attrs.ia_valid |= HOSTFS_ATTR_ATIME; |
bca30265 AB |
837 | attrs.ia_atime = (struct hostfs_timespec) |
838 | { attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec }; | |
1da177e4 | 839 | } |
84b3db04 | 840 | if (attr->ia_valid & ATTR_MTIME) { |
1da177e4 | 841 | attrs.ia_valid |= HOSTFS_ATTR_MTIME; |
bca30265 AB |
842 | attrs.ia_mtime = (struct hostfs_timespec) |
843 | { attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec }; | |
1da177e4 | 844 | } |
84b3db04 | 845 | if (attr->ia_valid & ATTR_CTIME) { |
1da177e4 | 846 | attrs.ia_valid |= HOSTFS_ATTR_CTIME; |
bca30265 AB |
847 | attrs.ia_ctime = (struct hostfs_timespec) |
848 | { attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec }; | |
1da177e4 | 849 | } |
84b3db04 | 850 | if (attr->ia_valid & ATTR_ATIME_SET) { |
1da177e4 LT |
851 | attrs.ia_valid |= HOSTFS_ATTR_ATIME_SET; |
852 | } | |
84b3db04 | 853 | if (attr->ia_valid & ATTR_MTIME_SET) { |
1da177e4 LT |
854 | attrs.ia_valid |= HOSTFS_ATTR_MTIME_SET; |
855 | } | |
c5322220 | 856 | name = dentry_name(dentry); |
84b3db04 | 857 | if (name == NULL) |
f1adc05e | 858 | return -ENOMEM; |
5822b7fa | 859 | err = set_attr(name, &attrs, fd); |
e9193059 | 860 | __putname(name); |
84b3db04 | 861 | if (err) |
f1adc05e | 862 | return err; |
1da177e4 | 863 | |
1025774c | 864 | if ((attr->ia_valid & ATTR_SIZE) && |
bc077320 | 865 | attr->ia_size != i_size_read(inode)) |
3be2be0a | 866 | truncate_setsize(inode, attr->ia_size); |
1025774c | 867 | |
c1632a0f | 868 | setattr_copy(&nop_mnt_idmap, inode, attr); |
1025774c CH |
869 | mark_inode_dirty(inode); |
870 | return 0; | |
1da177e4 LT |
871 | } |
872 | ||
92e1d5be | 873 | static const struct inode_operations hostfs_iops = { |
1da177e4 LT |
874 | .permission = hostfs_permission, |
875 | .setattr = hostfs_setattr, | |
1da177e4 LT |
876 | }; |
877 | ||
92e1d5be | 878 | static const struct inode_operations hostfs_dir_iops = { |
1da177e4 LT |
879 | .create = hostfs_create, |
880 | .lookup = hostfs_lookup, | |
881 | .link = hostfs_link, | |
882 | .unlink = hostfs_unlink, | |
883 | .symlink = hostfs_symlink, | |
884 | .mkdir = hostfs_mkdir, | |
885 | .rmdir = hostfs_rmdir, | |
886 | .mknod = hostfs_mknod, | |
2773bf00 | 887 | .rename = hostfs_rename2, |
1da177e4 LT |
888 | .permission = hostfs_permission, |
889 | .setattr = hostfs_setattr, | |
1da177e4 LT |
890 | }; |
891 | ||
6b255391 | 892 | static const char *hostfs_get_link(struct dentry *dentry, |
fceef393 AV |
893 | struct inode *inode, |
894 | struct delayed_call *done) | |
d0352d3e | 895 | { |
6b255391 AV |
896 | char *link; |
897 | if (!dentry) | |
898 | return ERR_PTR(-ECHILD); | |
fceef393 | 899 | link = kmalloc(PATH_MAX, GFP_KERNEL); |
d0352d3e AV |
900 | if (link) { |
901 | char *path = dentry_name(dentry); | |
902 | int err = -ENOMEM; | |
903 | if (path) { | |
3b6036d1 | 904 | err = hostfs_do_readlink(path, link, PATH_MAX); |
d0352d3e AV |
905 | if (err == PATH_MAX) |
906 | err = -E2BIG; | |
e9193059 | 907 | __putname(path); |
d0352d3e AV |
908 | } |
909 | if (err < 0) { | |
fceef393 | 910 | kfree(link); |
680baacb | 911 | return ERR_PTR(err); |
d0352d3e AV |
912 | } |
913 | } else { | |
680baacb | 914 | return ERR_PTR(-ENOMEM); |
1da177e4 | 915 | } |
d0352d3e | 916 | |
fceef393 AV |
917 | set_delayed_call(done, kfree_link, link); |
918 | return link; | |
1da177e4 LT |
919 | } |
920 | ||
d0352d3e | 921 | static const struct inode_operations hostfs_link_iops = { |
6b255391 | 922 | .get_link = hostfs_get_link, |
1da177e4 LT |
923 | }; |
924 | ||
925 | static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) | |
926 | { | |
927 | struct inode *root_inode; | |
75e8defb | 928 | char *host_root_path, *req_root = d; |
1da177e4 LT |
929 | int err; |
930 | ||
931 | sb->s_blocksize = 1024; | |
932 | sb->s_blocksize_bits = 10; | |
933 | sb->s_magic = HOSTFS_SUPER_MAGIC; | |
934 | sb->s_op = &hostfs_sbops; | |
b26d4cd3 | 935 | sb->s_d_op = &simple_dentry_operations; |
752fa51e | 936 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
ce72750f SS |
937 | err = super_setup_bdi(sb); |
938 | if (err) | |
74ce793b | 939 | return err; |
1da177e4 | 940 | |
b58c4e96 | 941 | /* NULL is printed as '(null)' by printf(): avoid that. */ |
75e8defb PBG |
942 | if (req_root == NULL) |
943 | req_root = ""; | |
1da177e4 | 944 | |
601d2c38 | 945 | sb->s_fs_info = host_root_path = |
b58c4e96 | 946 | kasprintf(GFP_KERNEL, "%s/%s", root_ino, req_root); |
84b3db04 | 947 | if (host_root_path == NULL) |
74ce793b | 948 | return -ENOMEM; |
1da177e4 | 949 | |
74ce793b MS |
950 | root_inode = hostfs_iget(sb, host_root_path); |
951 | if (IS_ERR(root_inode)) | |
952 | return PTR_ERR(root_inode); | |
52b209f7 | 953 | |
4754b825 | 954 | if (S_ISLNK(root_inode->i_mode)) { |
74ce793b MS |
955 | char *name; |
956 | ||
957 | iput(root_inode); | |
958 | name = follow_link(host_root_path); | |
959 | if (IS_ERR(name)) | |
960 | return PTR_ERR(name); | |
961 | ||
962 | root_inode = hostfs_iget(sb, name); | |
52b209f7 | 963 | kfree(name); |
74ce793b MS |
964 | if (IS_ERR(root_inode)) |
965 | return PTR_ERR(root_inode); | |
52b209f7 | 966 | } |
1da177e4 | 967 | |
48fde701 | 968 | sb->s_root = d_make_root(root_inode); |
84b3db04 | 969 | if (sb->s_root == NULL) |
74ce793b | 970 | return -ENOMEM; |
1da177e4 | 971 | |
f1adc05e | 972 | return 0; |
1da177e4 LT |
973 | } |
974 | ||
3c26ff6e | 975 | static struct dentry *hostfs_read_sb(struct file_system_type *type, |
454e2398 | 976 | int flags, const char *dev_name, |
3c26ff6e | 977 | void *data) |
1da177e4 | 978 | { |
3c26ff6e | 979 | return mount_nodev(type, flags, data, hostfs_fill_sb_common); |
1da177e4 LT |
980 | } |
981 | ||
601d2c38 AV |
982 | static void hostfs_kill_sb(struct super_block *s) |
983 | { | |
984 | kill_anon_super(s); | |
985 | kfree(s->s_fs_info); | |
986 | } | |
987 | ||
1da177e4 LT |
988 | static struct file_system_type hostfs_type = { |
989 | .owner = THIS_MODULE, | |
990 | .name = "hostfs", | |
3c26ff6e | 991 | .mount = hostfs_read_sb, |
601d2c38 | 992 | .kill_sb = hostfs_kill_sb, |
1da177e4 LT |
993 | .fs_flags = 0, |
994 | }; | |
3e64fe5b | 995 | MODULE_ALIAS_FS("hostfs"); |
1da177e4 LT |
996 | |
997 | static int __init init_hostfs(void) | |
998 | { | |
a15f1e41 JB |
999 | hostfs_inode_cache = KMEM_CACHE(hostfs_inode_info, 0); |
1000 | if (!hostfs_inode_cache) | |
1001 | return -ENOMEM; | |
f1adc05e | 1002 | return register_filesystem(&hostfs_type); |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | static void __exit exit_hostfs(void) | |
1006 | { | |
1007 | unregister_filesystem(&hostfs_type); | |
a15f1e41 | 1008 | kmem_cache_destroy(hostfs_inode_cache); |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | module_init(init_hostfs) | |
1012 | module_exit(exit_hostfs) | |
1013 | MODULE_LICENSE("GPL"); |