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14#include <linux/module.h>
15#include "minix.h"
16#include <linux/buffer_head.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/highuid.h>
20#include <linux/vfs.h>
21#include <linux/writeback.h>
22
23static int minix_write_inode(struct inode *inode,
24 struct writeback_control *wbc);
25static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
26static int minix_remount (struct super_block * sb, int * flags, char * data);
27
28static void minix_evict_inode(struct inode *inode)
29{
30 truncate_inode_pages_final(&inode->i_data);
31 if (!inode->i_nlink) {
32 inode->i_size = 0;
33 minix_truncate(inode);
34 }
35 invalidate_inode_buffers(inode);
36 clear_inode(inode);
37 if (!inode->i_nlink)
38 minix_free_inode(inode);
39}
40
41static void minix_put_super(struct super_block *sb)
42{
43 int i;
44 struct minix_sb_info *sbi = minix_sb(sb);
45
46 if (!sb_rdonly(sb)) {
47 if (sbi->s_version != MINIX_V3)
48 sbi->s_ms->s_state = sbi->s_mount_state;
49 mark_buffer_dirty(sbi->s_sbh);
50 }
51 for (i = 0; i < sbi->s_imap_blocks; i++)
52 brelse(sbi->s_imap[i]);
53 for (i = 0; i < sbi->s_zmap_blocks; i++)
54 brelse(sbi->s_zmap[i]);
55 brelse (sbi->s_sbh);
56 kfree(sbi->s_imap);
57 sb->s_fs_info = NULL;
58 kfree(sbi);
59}
60
61static struct kmem_cache * minix_inode_cachep;
62
63static struct inode *minix_alloc_inode(struct super_block *sb)
64{
65 struct minix_inode_info *ei;
66 ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
67 if (!ei)
68 return NULL;
69 return &ei->vfs_inode;
70}
71
72static void minix_free_in_core_inode(struct inode *inode)
73{
74 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75}
76
77static void init_once(void *foo)
78{
79 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
80
81 inode_init_once(&ei->vfs_inode);
82}
83
84static int __init init_inodecache(void)
85{
86 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
87 sizeof(struct minix_inode_info),
88 0, (SLAB_RECLAIM_ACCOUNT|
89 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
90 init_once);
91 if (minix_inode_cachep == NULL)
92 return -ENOMEM;
93 return 0;
94}
95
96static void destroy_inodecache(void)
97{
98
99
100
101
102 rcu_barrier();
103 kmem_cache_destroy(minix_inode_cachep);
104}
105
106static const struct super_operations minix_sops = {
107 .alloc_inode = minix_alloc_inode,
108 .free_inode = minix_free_in_core_inode,
109 .write_inode = minix_write_inode,
110 .evict_inode = minix_evict_inode,
111 .put_super = minix_put_super,
112 .statfs = minix_statfs,
113 .remount_fs = minix_remount,
114};
115
116static int minix_remount (struct super_block * sb, int * flags, char * data)
117{
118 struct minix_sb_info * sbi = minix_sb(sb);
119 struct minix_super_block * ms;
120
121 sync_filesystem(sb);
122 ms = sbi->s_ms;
123 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
124 return 0;
125 if (*flags & SB_RDONLY) {
126 if (ms->s_state & MINIX_VALID_FS ||
127 !(sbi->s_mount_state & MINIX_VALID_FS))
128 return 0;
129
130 if (sbi->s_version != MINIX_V3)
131 ms->s_state = sbi->s_mount_state;
132 mark_buffer_dirty(sbi->s_sbh);
133 } else {
134
135 if (sbi->s_version != MINIX_V3) {
136 sbi->s_mount_state = ms->s_state;
137 ms->s_state &= ~MINIX_VALID_FS;
138 } else {
139 sbi->s_mount_state = MINIX_VALID_FS;
140 }
141 mark_buffer_dirty(sbi->s_sbh);
142
143 if (!(sbi->s_mount_state & MINIX_VALID_FS))
144 printk("MINIX-fs warning: remounting unchecked fs, "
145 "running fsck is recommended\n");
146 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
147 printk("MINIX-fs warning: remounting fs with errors, "
148 "running fsck is recommended\n");
149 }
150 return 0;
151}
152
153static bool minix_check_superblock(struct super_block *sb)
154{
155 struct minix_sb_info *sbi = minix_sb(sb);
156
157 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
158 return false;
159
160
161
162
163
164
165 if (sbi->s_version == MINIX_V1 &&
166 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
167 return false;
168
169 return true;
170}
171
172static int minix_fill_super(struct super_block *s, void *data, int silent)
173{
174 struct buffer_head *bh;
175 struct buffer_head **map;
176 struct minix_super_block *ms;
177 struct minix3_super_block *m3s = NULL;
178 unsigned long i, block;
179 struct inode *root_inode;
180 struct minix_sb_info *sbi;
181 int ret = -EINVAL;
182
183 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
184 if (!sbi)
185 return -ENOMEM;
186 s->s_fs_info = sbi;
187
188 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
189 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
190
191 if (!sb_set_blocksize(s, BLOCK_SIZE))
192 goto out_bad_hblock;
193
194 if (!(bh = sb_bread(s, 1)))
195 goto out_bad_sb;
196
197 ms = (struct minix_super_block *) bh->b_data;
198 sbi->s_ms = ms;
199 sbi->s_sbh = bh;
200 sbi->s_mount_state = ms->s_state;
201 sbi->s_ninodes = ms->s_ninodes;
202 sbi->s_nzones = ms->s_nzones;
203 sbi->s_imap_blocks = ms->s_imap_blocks;
204 sbi->s_zmap_blocks = ms->s_zmap_blocks;
205 sbi->s_firstdatazone = ms->s_firstdatazone;
206 sbi->s_log_zone_size = ms->s_log_zone_size;
207 s->s_maxbytes = ms->s_max_size;
208 s->s_magic = ms->s_magic;
209 if (s->s_magic == MINIX_SUPER_MAGIC) {
210 sbi->s_version = MINIX_V1;
211 sbi->s_dirsize = 16;
212 sbi->s_namelen = 14;
213 s->s_max_links = MINIX_LINK_MAX;
214 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
215 sbi->s_version = MINIX_V1;
216 sbi->s_dirsize = 32;
217 sbi->s_namelen = 30;
218 s->s_max_links = MINIX_LINK_MAX;
219 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
220 sbi->s_version = MINIX_V2;
221 sbi->s_nzones = ms->s_zones;
222 sbi->s_dirsize = 16;
223 sbi->s_namelen = 14;
224 s->s_max_links = MINIX2_LINK_MAX;
225 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
226 sbi->s_version = MINIX_V2;
227 sbi->s_nzones = ms->s_zones;
228 sbi->s_dirsize = 32;
229 sbi->s_namelen = 30;
230 s->s_max_links = MINIX2_LINK_MAX;
231 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
232 m3s = (struct minix3_super_block *) bh->b_data;
233 s->s_magic = m3s->s_magic;
234 sbi->s_imap_blocks = m3s->s_imap_blocks;
235 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
236 sbi->s_firstdatazone = m3s->s_firstdatazone;
237 sbi->s_log_zone_size = m3s->s_log_zone_size;
238 s->s_maxbytes = m3s->s_max_size;
239 sbi->s_ninodes = m3s->s_ninodes;
240 sbi->s_nzones = m3s->s_zones;
241 sbi->s_dirsize = 64;
242 sbi->s_namelen = 60;
243 sbi->s_version = MINIX_V3;
244 sbi->s_mount_state = MINIX_VALID_FS;
245 sb_set_blocksize(s, m3s->s_blocksize);
246 s->s_max_links = MINIX2_LINK_MAX;
247 } else
248 goto out_no_fs;
249
250 if (!minix_check_superblock(s))
251 goto out_illegal_sb;
252
253
254
255
256 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
257 map = kzalloc(i, GFP_KERNEL);
258 if (!map)
259 goto out_no_map;
260 sbi->s_imap = &map[0];
261 sbi->s_zmap = &map[sbi->s_imap_blocks];
262
263 block=2;
264 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
265 if (!(sbi->s_imap[i]=sb_bread(s, block)))
266 goto out_no_bitmap;
267 block++;
268 }
269 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
270 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
271 goto out_no_bitmap;
272 block++;
273 }
274
275 minix_set_bit(0,sbi->s_imap[0]->b_data);
276 minix_set_bit(0,sbi->s_zmap[0]->b_data);
277
278
279
280
281
282 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
283 if (sbi->s_imap_blocks < block) {
284 printk("MINIX-fs: file system does not have enough "
285 "imap blocks allocated. Refusing to mount.\n");
286 goto out_no_bitmap;
287 }
288
289 block = minix_blocks_needed(
290 (sbi->s_nzones - sbi->s_firstdatazone + 1),
291 s->s_blocksize);
292 if (sbi->s_zmap_blocks < block) {
293 printk("MINIX-fs: file system does not have enough "
294 "zmap blocks allocated. Refusing to mount.\n");
295 goto out_no_bitmap;
296 }
297
298
299 s->s_op = &minix_sops;
300 s->s_time_min = 0;
301 s->s_time_max = U32_MAX;
302 root_inode = minix_iget(s, MINIX_ROOT_INO);
303 if (IS_ERR(root_inode)) {
304 ret = PTR_ERR(root_inode);
305 goto out_no_root;
306 }
307
308 ret = -ENOMEM;
309 s->s_root = d_make_root(root_inode);
310 if (!s->s_root)
311 goto out_no_root;
312
313 if (!sb_rdonly(s)) {
314 if (sbi->s_version != MINIX_V3)
315 ms->s_state &= ~MINIX_VALID_FS;
316 mark_buffer_dirty(bh);
317 }
318 if (!(sbi->s_mount_state & MINIX_VALID_FS))
319 printk("MINIX-fs: mounting unchecked file system, "
320 "running fsck is recommended\n");
321 else if (sbi->s_mount_state & MINIX_ERROR_FS)
322 printk("MINIX-fs: mounting file system with errors, "
323 "running fsck is recommended\n");
324
325 return 0;
326
327out_no_root:
328 if (!silent)
329 printk("MINIX-fs: get root inode failed\n");
330 goto out_freemap;
331
332out_no_bitmap:
333 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
334out_freemap:
335 for (i = 0; i < sbi->s_imap_blocks; i++)
336 brelse(sbi->s_imap[i]);
337 for (i = 0; i < sbi->s_zmap_blocks; i++)
338 brelse(sbi->s_zmap[i]);
339 kfree(sbi->s_imap);
340 goto out_release;
341
342out_no_map:
343 ret = -ENOMEM;
344 if (!silent)
345 printk("MINIX-fs: can't allocate map\n");
346 goto out_release;
347
348out_illegal_sb:
349 if (!silent)
350 printk("MINIX-fs: bad superblock\n");
351 goto out_release;
352
353out_no_fs:
354 if (!silent)
355 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
356 "on device %s.\n", s->s_id);
357out_release:
358 brelse(bh);
359 goto out;
360
361out_bad_hblock:
362 printk("MINIX-fs: blocksize too small for device\n");
363 goto out;
364
365out_bad_sb:
366 printk("MINIX-fs: unable to read superblock\n");
367out:
368 s->s_fs_info = NULL;
369 kfree(sbi);
370 return ret;
371}
372
373static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
374{
375 struct super_block *sb = dentry->d_sb;
376 struct minix_sb_info *sbi = minix_sb(sb);
377 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
378 buf->f_type = sb->s_magic;
379 buf->f_bsize = sb->s_blocksize;
380 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
381 buf->f_bfree = minix_count_free_blocks(sb);
382 buf->f_bavail = buf->f_bfree;
383 buf->f_files = sbi->s_ninodes;
384 buf->f_ffree = minix_count_free_inodes(sb);
385 buf->f_namelen = sbi->s_namelen;
386 buf->f_fsid = u64_to_fsid(id);
387
388 return 0;
389}
390
391static int minix_get_block(struct inode *inode, sector_t block,
392 struct buffer_head *bh_result, int create)
393{
394 if (INODE_VERSION(inode) == MINIX_V1)
395 return V1_minix_get_block(inode, block, bh_result, create);
396 else
397 return V2_minix_get_block(inode, block, bh_result, create);
398}
399
400static int minix_writepage(struct page *page, struct writeback_control *wbc)
401{
402 return block_write_full_page(page, minix_get_block, wbc);
403}
404
405static int minix_readpage(struct file *file, struct page *page)
406{
407 return block_read_full_page(page,minix_get_block);
408}
409
410int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
411{
412 return __block_write_begin(page, pos, len, minix_get_block);
413}
414
415static void minix_write_failed(struct address_space *mapping, loff_t to)
416{
417 struct inode *inode = mapping->host;
418
419 if (to > inode->i_size) {
420 truncate_pagecache(inode, inode->i_size);
421 minix_truncate(inode);
422 }
423}
424
425static int minix_write_begin(struct file *file, struct address_space *mapping,
426 loff_t pos, unsigned len, unsigned flags,
427 struct page **pagep, void **fsdata)
428{
429 int ret;
430
431 ret = block_write_begin(mapping, pos, len, flags, pagep,
432 minix_get_block);
433 if (unlikely(ret))
434 minix_write_failed(mapping, pos + len);
435
436 return ret;
437}
438
439static sector_t minix_bmap(struct address_space *mapping, sector_t block)
440{
441 return generic_block_bmap(mapping,block,minix_get_block);
442}
443
444static const struct address_space_operations minix_aops = {
445 .set_page_dirty = __set_page_dirty_buffers,
446 .readpage = minix_readpage,
447 .writepage = minix_writepage,
448 .write_begin = minix_write_begin,
449 .write_end = generic_write_end,
450 .bmap = minix_bmap
451};
452
453static const struct inode_operations minix_symlink_inode_operations = {
454 .get_link = page_get_link,
455 .getattr = minix_getattr,
456};
457
458void minix_set_inode(struct inode *inode, dev_t rdev)
459{
460 if (S_ISREG(inode->i_mode)) {
461 inode->i_op = &minix_file_inode_operations;
462 inode->i_fop = &minix_file_operations;
463 inode->i_mapping->a_ops = &minix_aops;
464 } else if (S_ISDIR(inode->i_mode)) {
465 inode->i_op = &minix_dir_inode_operations;
466 inode->i_fop = &minix_dir_operations;
467 inode->i_mapping->a_ops = &minix_aops;
468 } else if (S_ISLNK(inode->i_mode)) {
469 inode->i_op = &minix_symlink_inode_operations;
470 inode_nohighmem(inode);
471 inode->i_mapping->a_ops = &minix_aops;
472 } else
473 init_special_inode(inode, inode->i_mode, rdev);
474}
475
476
477
478
479static struct inode *V1_minix_iget(struct inode *inode)
480{
481 struct buffer_head * bh;
482 struct minix_inode * raw_inode;
483 struct minix_inode_info *minix_inode = minix_i(inode);
484 int i;
485
486 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
487 if (!raw_inode) {
488 iget_failed(inode);
489 return ERR_PTR(-EIO);
490 }
491 if (raw_inode->i_nlinks == 0) {
492 printk("MINIX-fs: deleted inode referenced: %lu\n",
493 inode->i_ino);
494 brelse(bh);
495 iget_failed(inode);
496 return ERR_PTR(-ESTALE);
497 }
498 inode->i_mode = raw_inode->i_mode;
499 i_uid_write(inode, raw_inode->i_uid);
500 i_gid_write(inode, raw_inode->i_gid);
501 set_nlink(inode, raw_inode->i_nlinks);
502 inode->i_size = raw_inode->i_size;
503 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
504 inode->i_mtime.tv_nsec = 0;
505 inode->i_atime.tv_nsec = 0;
506 inode->i_ctime.tv_nsec = 0;
507 inode->i_blocks = 0;
508 for (i = 0; i < 9; i++)
509 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
510 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
511 brelse(bh);
512 unlock_new_inode(inode);
513 return inode;
514}
515
516
517
518
519static struct inode *V2_minix_iget(struct inode *inode)
520{
521 struct buffer_head * bh;
522 struct minix2_inode * raw_inode;
523 struct minix_inode_info *minix_inode = minix_i(inode);
524 int i;
525
526 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
527 if (!raw_inode) {
528 iget_failed(inode);
529 return ERR_PTR(-EIO);
530 }
531 if (raw_inode->i_nlinks == 0) {
532 printk("MINIX-fs: deleted inode referenced: %lu\n",
533 inode->i_ino);
534 brelse(bh);
535 iget_failed(inode);
536 return ERR_PTR(-ESTALE);
537 }
538 inode->i_mode = raw_inode->i_mode;
539 i_uid_write(inode, raw_inode->i_uid);
540 i_gid_write(inode, raw_inode->i_gid);
541 set_nlink(inode, raw_inode->i_nlinks);
542 inode->i_size = raw_inode->i_size;
543 inode->i_mtime.tv_sec = raw_inode->i_mtime;
544 inode->i_atime.tv_sec = raw_inode->i_atime;
545 inode->i_ctime.tv_sec = raw_inode->i_ctime;
546 inode->i_mtime.tv_nsec = 0;
547 inode->i_atime.tv_nsec = 0;
548 inode->i_ctime.tv_nsec = 0;
549 inode->i_blocks = 0;
550 for (i = 0; i < 10; i++)
551 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
552 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
553 brelse(bh);
554 unlock_new_inode(inode);
555 return inode;
556}
557
558
559
560
561struct inode *minix_iget(struct super_block *sb, unsigned long ino)
562{
563 struct inode *inode;
564
565 inode = iget_locked(sb, ino);
566 if (!inode)
567 return ERR_PTR(-ENOMEM);
568 if (!(inode->i_state & I_NEW))
569 return inode;
570
571 if (INODE_VERSION(inode) == MINIX_V1)
572 return V1_minix_iget(inode);
573 else
574 return V2_minix_iget(inode);
575}
576
577
578
579
580static struct buffer_head * V1_minix_update_inode(struct inode * inode)
581{
582 struct buffer_head * bh;
583 struct minix_inode * raw_inode;
584 struct minix_inode_info *minix_inode = minix_i(inode);
585 int i;
586
587 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
588 if (!raw_inode)
589 return NULL;
590 raw_inode->i_mode = inode->i_mode;
591 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
592 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
593 raw_inode->i_nlinks = inode->i_nlink;
594 raw_inode->i_size = inode->i_size;
595 raw_inode->i_time = inode->i_mtime.tv_sec;
596 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
597 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
598 else for (i = 0; i < 9; i++)
599 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
600 mark_buffer_dirty(bh);
601 return bh;
602}
603
604
605
606
607static struct buffer_head * V2_minix_update_inode(struct inode * inode)
608{
609 struct buffer_head * bh;
610 struct minix2_inode * raw_inode;
611 struct minix_inode_info *minix_inode = minix_i(inode);
612 int i;
613
614 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
615 if (!raw_inode)
616 return NULL;
617 raw_inode->i_mode = inode->i_mode;
618 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
619 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
620 raw_inode->i_nlinks = inode->i_nlink;
621 raw_inode->i_size = inode->i_size;
622 raw_inode->i_mtime = inode->i_mtime.tv_sec;
623 raw_inode->i_atime = inode->i_atime.tv_sec;
624 raw_inode->i_ctime = inode->i_ctime.tv_sec;
625 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
626 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
627 else for (i = 0; i < 10; i++)
628 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
629 mark_buffer_dirty(bh);
630 return bh;
631}
632
633static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
634{
635 int err = 0;
636 struct buffer_head *bh;
637
638 if (INODE_VERSION(inode) == MINIX_V1)
639 bh = V1_minix_update_inode(inode);
640 else
641 bh = V2_minix_update_inode(inode);
642 if (!bh)
643 return -EIO;
644 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
645 sync_dirty_buffer(bh);
646 if (buffer_req(bh) && !buffer_uptodate(bh)) {
647 printk("IO error syncing minix inode [%s:%08lx]\n",
648 inode->i_sb->s_id, inode->i_ino);
649 err = -EIO;
650 }
651 }
652 brelse (bh);
653 return err;
654}
655
656int minix_getattr(struct user_namespace *mnt_userns, const struct path *path,
657 struct kstat *stat, u32 request_mask, unsigned int flags)
658{
659 struct super_block *sb = path->dentry->d_sb;
660 struct inode *inode = d_inode(path->dentry);
661
662 generic_fillattr(&init_user_ns, inode, stat);
663 if (INODE_VERSION(inode) == MINIX_V1)
664 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
665 else
666 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
667 stat->blksize = sb->s_blocksize;
668 return 0;
669}
670
671
672
673
674void minix_truncate(struct inode * inode)
675{
676 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
677 return;
678 if (INODE_VERSION(inode) == MINIX_V1)
679 V1_minix_truncate(inode);
680 else
681 V2_minix_truncate(inode);
682}
683
684static struct dentry *minix_mount(struct file_system_type *fs_type,
685 int flags, const char *dev_name, void *data)
686{
687 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
688}
689
690static struct file_system_type minix_fs_type = {
691 .owner = THIS_MODULE,
692 .name = "minix",
693 .mount = minix_mount,
694 .kill_sb = kill_block_super,
695 .fs_flags = FS_REQUIRES_DEV,
696};
697MODULE_ALIAS_FS("minix");
698
699static int __init init_minix_fs(void)
700{
701 int err = init_inodecache();
702 if (err)
703 goto out1;
704 err = register_filesystem(&minix_fs_type);
705 if (err)
706 goto out;
707 return 0;
708out:
709 destroy_inodecache();
710out1:
711 return err;
712}
713
714static void __exit exit_minix_fs(void)
715{
716 unregister_filesystem(&minix_fs_type);
717 destroy_inodecache();
718}
719
720module_init(init_minix_fs)
721module_exit(exit_minix_fs)
722MODULE_LICENSE("GPL");
723
724
