1 /*
2 * linux/fs/minix/inode.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * Copyright (C) 1996 Gertjan van Wingerde
7 * Minix V2 fs support.
8 *
9 * Modified for 680x0 by Andreas Schwab
10 * Updated to filesystem version 3 by Daniel Aragones
11 */
12
13 #include <linux/module.h>
14 #include "minix.h"
15 #include <linux/buffer_head.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/highuid.h>
19 #include <linux/vfs.h>
20 #include <linux/writeback.h>
21
22 static int minix_write_inode(struct inode *inode,
23 struct writeback_control *wbc);
24 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
25 static int minix_remount (struct super_block * sb, int * flags, char * data);
26
minix_evict_inode(struct inode * inode)27 static void minix_evict_inode(struct inode *inode)
28 {
29 truncate_inode_pages_final(&inode->i_data);
30 if (!inode->i_nlink) {
31 inode->i_size = 0;
32 minix_truncate(inode);
33 }
34 invalidate_inode_buffers(inode);
35 clear_inode(inode);
36 if (!inode->i_nlink)
37 minix_free_inode(inode);
38 }
39
minix_put_super(struct super_block * sb)40 static void minix_put_super(struct super_block *sb)
41 {
42 int i;
43 struct minix_sb_info *sbi = minix_sb(sb);
44
45 if (!(sb->s_flags & MS_RDONLY)) {
46 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
47 sbi->s_ms->s_state = sbi->s_mount_state;
48 mark_buffer_dirty(sbi->s_sbh);
49 }
50 for (i = 0; i < sbi->s_imap_blocks; i++)
51 brelse(sbi->s_imap[i]);
52 for (i = 0; i < sbi->s_zmap_blocks; i++)
53 brelse(sbi->s_zmap[i]);
54 brelse (sbi->s_sbh);
55 kfree(sbi->s_imap);
56 sb->s_fs_info = NULL;
57 kfree(sbi);
58 }
59
60 static struct kmem_cache * minix_inode_cachep;
61
minix_alloc_inode(struct super_block * sb)62 static struct inode *minix_alloc_inode(struct super_block *sb)
63 {
64 struct minix_inode_info *ei;
65 ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
66 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69 }
70
minix_i_callback(struct rcu_head * head)71 static void minix_i_callback(struct rcu_head *head)
72 {
73 struct inode *inode = container_of(head, struct inode, i_rcu);
74 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75 }
76
minix_destroy_inode(struct inode * inode)77 static void minix_destroy_inode(struct inode *inode)
78 {
79 call_rcu(&inode->i_rcu, minix_i_callback);
80 }
81
init_once(void * foo)82 static void init_once(void *foo)
83 {
84 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
85
86 inode_init_once(&ei->vfs_inode);
87 }
88
init_inodecache(void)89 static int __init init_inodecache(void)
90 {
91 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info),
93 0, (SLAB_RECLAIM_ACCOUNT|
94 SLAB_MEM_SPREAD),
95 init_once);
96 if (minix_inode_cachep == NULL)
97 return -ENOMEM;
98 return 0;
99 }
100
destroy_inodecache(void)101 static void destroy_inodecache(void)
102 {
103 /*
104 * Make sure all delayed rcu free inodes are flushed before we
105 * destroy cache.
106 */
107 rcu_barrier();
108 kmem_cache_destroy(minix_inode_cachep);
109 }
110
111 static const struct super_operations minix_sops = {
112 .alloc_inode = minix_alloc_inode,
113 .destroy_inode = minix_destroy_inode,
114 .write_inode = minix_write_inode,
115 .evict_inode = minix_evict_inode,
116 .put_super = minix_put_super,
117 .statfs = minix_statfs,
118 .remount_fs = minix_remount,
119 };
120
minix_remount(struct super_block * sb,int * flags,char * data)121 static int minix_remount (struct super_block * sb, int * flags, char * data)
122 {
123 struct minix_sb_info * sbi = minix_sb(sb);
124 struct minix_super_block * ms;
125
126 sync_filesystem(sb);
127 ms = sbi->s_ms;
128 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
129 return 0;
130 if (*flags & MS_RDONLY) {
131 if (ms->s_state & MINIX_VALID_FS ||
132 !(sbi->s_mount_state & MINIX_VALID_FS))
133 return 0;
134 /* Mounting a rw partition read-only. */
135 if (sbi->s_version != MINIX_V3)
136 ms->s_state = sbi->s_mount_state;
137 mark_buffer_dirty(sbi->s_sbh);
138 } else {
139 /* Mount a partition which is read-only, read-write. */
140 if (sbi->s_version != MINIX_V3) {
141 sbi->s_mount_state = ms->s_state;
142 ms->s_state &= ~MINIX_VALID_FS;
143 } else {
144 sbi->s_mount_state = MINIX_VALID_FS;
145 }
146 mark_buffer_dirty(sbi->s_sbh);
147
148 if (!(sbi->s_mount_state & MINIX_VALID_FS))
149 printk("MINIX-fs warning: remounting unchecked fs, "
150 "running fsck is recommended\n");
151 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
152 printk("MINIX-fs warning: remounting fs with errors, "
153 "running fsck is recommended\n");
154 }
155 return 0;
156 }
157
minix_check_superblock(struct minix_sb_info * sbi)158 static bool minix_check_superblock(struct minix_sb_info *sbi)
159 {
160 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
161 return false;
162
163 /*
164 * s_max_size must not exceed the block mapping limitation. This check
165 * is only needed for V1 filesystems, since V2/V3 support an extra level
166 * of indirect blocks which places the limit well above U32_MAX.
167 */
168 if (sbi->s_version == MINIX_V1 &&
169 sbi->s_max_size > (7 + 512 + 512*512) * BLOCK_SIZE)
170 return false;
171
172 return true;
173 }
174
minix_fill_super(struct super_block * s,void * data,int silent)175 static int minix_fill_super(struct super_block *s, void *data, int silent)
176 {
177 struct buffer_head *bh;
178 struct buffer_head **map;
179 struct minix_super_block *ms;
180 struct minix3_super_block *m3s = NULL;
181 unsigned long i, block;
182 struct inode *root_inode;
183 struct minix_sb_info *sbi;
184 int ret = -EINVAL;
185
186 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
187 if (!sbi)
188 return -ENOMEM;
189 s->s_fs_info = sbi;
190
191 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
192 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
193
194 if (!sb_set_blocksize(s, BLOCK_SIZE))
195 goto out_bad_hblock;
196
197 if (!(bh = sb_bread(s, 1)))
198 goto out_bad_sb;
199
200 ms = (struct minix_super_block *) bh->b_data;
201 sbi->s_ms = ms;
202 sbi->s_sbh = bh;
203 sbi->s_mount_state = ms->s_state;
204 sbi->s_ninodes = ms->s_ninodes;
205 sbi->s_nzones = ms->s_nzones;
206 sbi->s_imap_blocks = ms->s_imap_blocks;
207 sbi->s_zmap_blocks = ms->s_zmap_blocks;
208 sbi->s_firstdatazone = ms->s_firstdatazone;
209 sbi->s_log_zone_size = ms->s_log_zone_size;
210 sbi->s_max_size = ms->s_max_size;
211 s->s_magic = ms->s_magic;
212 if (s->s_magic == MINIX_SUPER_MAGIC) {
213 sbi->s_version = MINIX_V1;
214 sbi->s_dirsize = 16;
215 sbi->s_namelen = 14;
216 s->s_max_links = MINIX_LINK_MAX;
217 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
218 sbi->s_version = MINIX_V1;
219 sbi->s_dirsize = 32;
220 sbi->s_namelen = 30;
221 s->s_max_links = MINIX_LINK_MAX;
222 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
223 sbi->s_version = MINIX_V2;
224 sbi->s_nzones = ms->s_zones;
225 sbi->s_dirsize = 16;
226 sbi->s_namelen = 14;
227 s->s_max_links = MINIX2_LINK_MAX;
228 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
229 sbi->s_version = MINIX_V2;
230 sbi->s_nzones = ms->s_zones;
231 sbi->s_dirsize = 32;
232 sbi->s_namelen = 30;
233 s->s_max_links = MINIX2_LINK_MAX;
234 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
235 m3s = (struct minix3_super_block *) bh->b_data;
236 s->s_magic = m3s->s_magic;
237 sbi->s_imap_blocks = m3s->s_imap_blocks;
238 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
239 sbi->s_firstdatazone = m3s->s_firstdatazone;
240 sbi->s_log_zone_size = m3s->s_log_zone_size;
241 sbi->s_max_size = m3s->s_max_size;
242 sbi->s_ninodes = m3s->s_ninodes;
243 sbi->s_nzones = m3s->s_zones;
244 sbi->s_dirsize = 64;
245 sbi->s_namelen = 60;
246 sbi->s_version = MINIX_V3;
247 sbi->s_mount_state = MINIX_VALID_FS;
248 sb_set_blocksize(s, m3s->s_blocksize);
249 s->s_max_links = MINIX2_LINK_MAX;
250 } else
251 goto out_no_fs;
252
253 if (!minix_check_superblock(sbi))
254 goto out_illegal_sb;
255
256 /*
257 * Allocate the buffer map to keep the superblock small.
258 */
259 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
260 map = kzalloc(i, GFP_KERNEL);
261 if (!map)
262 goto out_no_map;
263 sbi->s_imap = &map[0];
264 sbi->s_zmap = &map[sbi->s_imap_blocks];
265
266 block=2;
267 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
268 if (!(sbi->s_imap[i]=sb_bread(s, block)))
269 goto out_no_bitmap;
270 block++;
271 }
272 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
273 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
274 goto out_no_bitmap;
275 block++;
276 }
277
278 minix_set_bit(0,sbi->s_imap[0]->b_data);
279 minix_set_bit(0,sbi->s_zmap[0]->b_data);
280
281 /* Apparently minix can create filesystems that allocate more blocks for
282 * the bitmaps than needed. We simply ignore that, but verify it didn't
283 * create one with not enough blocks and bail out if so.
284 */
285 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
286 if (sbi->s_imap_blocks < block) {
287 printk("MINIX-fs: file system does not have enough "
288 "imap blocks allocated. Refusing to mount.\n");
289 goto out_no_bitmap;
290 }
291
292 block = minix_blocks_needed(
293 (sbi->s_nzones - sbi->s_firstdatazone + 1),
294 s->s_blocksize);
295 if (sbi->s_zmap_blocks < block) {
296 printk("MINIX-fs: file system does not have enough "
297 "zmap blocks allocated. Refusing to mount.\n");
298 goto out_no_bitmap;
299 }
300
301 /* set up enough so that it can read an inode */
302 s->s_op = &minix_sops;
303 root_inode = minix_iget(s, MINIX_ROOT_INO);
304 if (IS_ERR(root_inode)) {
305 ret = PTR_ERR(root_inode);
306 goto out_no_root;
307 }
308
309 ret = -ENOMEM;
310 s->s_root = d_make_root(root_inode);
311 if (!s->s_root)
312 goto out_no_root;
313
314 if (!(s->s_flags & MS_RDONLY)) {
315 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
316 ms->s_state &= ~MINIX_VALID_FS;
317 mark_buffer_dirty(bh);
318 }
319 if (!(sbi->s_mount_state & MINIX_VALID_FS))
320 printk("MINIX-fs: mounting unchecked file system, "
321 "running fsck is recommended\n");
322 else if (sbi->s_mount_state & MINIX_ERROR_FS)
323 printk("MINIX-fs: mounting file system with errors, "
324 "running fsck is recommended\n");
325
326 return 0;
327
328 out_no_root:
329 if (!silent)
330 printk("MINIX-fs: get root inode failed\n");
331 goto out_freemap;
332
333 out_no_bitmap:
334 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
335 out_freemap:
336 for (i = 0; i < sbi->s_imap_blocks; i++)
337 brelse(sbi->s_imap[i]);
338 for (i = 0; i < sbi->s_zmap_blocks; i++)
339 brelse(sbi->s_zmap[i]);
340 kfree(sbi->s_imap);
341 goto out_release;
342
343 out_no_map:
344 ret = -ENOMEM;
345 if (!silent)
346 printk("MINIX-fs: can't allocate map\n");
347 goto out_release;
348
349 out_illegal_sb:
350 if (!silent)
351 printk("MINIX-fs: bad superblock\n");
352 goto out_release;
353
354 out_no_fs:
355 if (!silent)
356 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
357 "on device %s.\n", s->s_id);
358 out_release:
359 brelse(bh);
360 goto out;
361
362 out_bad_hblock:
363 printk("MINIX-fs: blocksize too small for device\n");
364 goto out;
365
366 out_bad_sb:
367 printk("MINIX-fs: unable to read superblock\n");
368 out:
369 s->s_fs_info = NULL;
370 kfree(sbi);
371 return ret;
372 }
373
minix_statfs(struct dentry * dentry,struct kstatfs * buf)374 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
375 {
376 struct super_block *sb = dentry->d_sb;
377 struct minix_sb_info *sbi = minix_sb(sb);
378 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
379 buf->f_type = sb->s_magic;
380 buf->f_bsize = sb->s_blocksize;
381 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
382 buf->f_bfree = minix_count_free_blocks(sb);
383 buf->f_bavail = buf->f_bfree;
384 buf->f_files = sbi->s_ninodes;
385 buf->f_ffree = minix_count_free_inodes(sb);
386 buf->f_namelen = sbi->s_namelen;
387 buf->f_fsid.val[0] = (u32)id;
388 buf->f_fsid.val[1] = (u32)(id >> 32);
389
390 return 0;
391 }
392
minix_get_block(struct inode * inode,sector_t block,struct buffer_head * bh_result,int create)393 static int minix_get_block(struct inode *inode, sector_t block,
394 struct buffer_head *bh_result, int create)
395 {
396 if (INODE_VERSION(inode) == MINIX_V1)
397 return V1_minix_get_block(inode, block, bh_result, create);
398 else
399 return V2_minix_get_block(inode, block, bh_result, create);
400 }
401
minix_writepage(struct page * page,struct writeback_control * wbc)402 static int minix_writepage(struct page *page, struct writeback_control *wbc)
403 {
404 return block_write_full_page(page, minix_get_block, wbc);
405 }
406
minix_readpage(struct file * file,struct page * page)407 static int minix_readpage(struct file *file, struct page *page)
408 {
409 return block_read_full_page(page,minix_get_block);
410 }
411
minix_prepare_chunk(struct page * page,loff_t pos,unsigned len)412 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
413 {
414 return __block_write_begin(page, pos, len, minix_get_block);
415 }
416
minix_write_failed(struct address_space * mapping,loff_t to)417 static void minix_write_failed(struct address_space *mapping, loff_t to)
418 {
419 struct inode *inode = mapping->host;
420
421 if (to > inode->i_size) {
422 truncate_pagecache(inode, inode->i_size);
423 minix_truncate(inode);
424 }
425 }
426
minix_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned flags,struct page ** pagep,void ** fsdata)427 static int minix_write_begin(struct file *file, struct address_space *mapping,
428 loff_t pos, unsigned len, unsigned flags,
429 struct page **pagep, void **fsdata)
430 {
431 int ret;
432
433 ret = block_write_begin(mapping, pos, len, flags, pagep,
434 minix_get_block);
435 if (unlikely(ret))
436 minix_write_failed(mapping, pos + len);
437
438 return ret;
439 }
440
minix_bmap(struct address_space * mapping,sector_t block)441 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
442 {
443 return generic_block_bmap(mapping,block,minix_get_block);
444 }
445
446 static const struct address_space_operations minix_aops = {
447 .readpage = minix_readpage,
448 .writepage = minix_writepage,
449 .write_begin = minix_write_begin,
450 .write_end = generic_write_end,
451 .bmap = minix_bmap
452 };
453
454 static const struct inode_operations minix_symlink_inode_operations = {
455 .readlink = generic_readlink,
456 .follow_link = page_follow_link_light,
457 .put_link = page_put_link,
458 .getattr = minix_getattr,
459 };
460
minix_set_inode(struct inode * inode,dev_t rdev)461 void minix_set_inode(struct inode *inode, dev_t rdev)
462 {
463 if (S_ISREG(inode->i_mode)) {
464 inode->i_op = &minix_file_inode_operations;
465 inode->i_fop = &minix_file_operations;
466 inode->i_mapping->a_ops = &minix_aops;
467 } else if (S_ISDIR(inode->i_mode)) {
468 inode->i_op = &minix_dir_inode_operations;
469 inode->i_fop = &minix_dir_operations;
470 inode->i_mapping->a_ops = &minix_aops;
471 } else if (S_ISLNK(inode->i_mode)) {
472 inode->i_op = &minix_symlink_inode_operations;
473 inode->i_mapping->a_ops = &minix_aops;
474 } else
475 init_special_inode(inode, inode->i_mode, rdev);
476 }
477
478 /*
479 * The minix V1 function to read an inode.
480 */
V1_minix_iget(struct inode * inode)481 static struct inode *V1_minix_iget(struct inode *inode)
482 {
483 struct buffer_head * bh;
484 struct minix_inode * raw_inode;
485 struct minix_inode_info *minix_inode = minix_i(inode);
486 int i;
487
488 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
489 if (!raw_inode) {
490 iget_failed(inode);
491 return ERR_PTR(-EIO);
492 }
493 if (raw_inode->i_nlinks == 0) {
494 printk("MINIX-fs: deleted inode referenced: %lu\n",
495 inode->i_ino);
496 brelse(bh);
497 iget_failed(inode);
498 return ERR_PTR(-ESTALE);
499 }
500 inode->i_mode = raw_inode->i_mode;
501 i_uid_write(inode, raw_inode->i_uid);
502 i_gid_write(inode, raw_inode->i_gid);
503 set_nlink(inode, raw_inode->i_nlinks);
504 inode->i_size = raw_inode->i_size;
505 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
506 inode->i_mtime.tv_nsec = 0;
507 inode->i_atime.tv_nsec = 0;
508 inode->i_ctime.tv_nsec = 0;
509 inode->i_blocks = 0;
510 for (i = 0; i < 9; i++)
511 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
512 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
513 brelse(bh);
514 unlock_new_inode(inode);
515 return inode;
516 }
517
518 /*
519 * The minix V2 function to read an inode.
520 */
V2_minix_iget(struct inode * inode)521 static struct inode *V2_minix_iget(struct inode *inode)
522 {
523 struct buffer_head * bh;
524 struct minix2_inode * raw_inode;
525 struct minix_inode_info *minix_inode = minix_i(inode);
526 int i;
527
528 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
529 if (!raw_inode) {
530 iget_failed(inode);
531 return ERR_PTR(-EIO);
532 }
533 if (raw_inode->i_nlinks == 0) {
534 printk("MINIX-fs: deleted inode referenced: %lu\n",
535 inode->i_ino);
536 brelse(bh);
537 iget_failed(inode);
538 return ERR_PTR(-ESTALE);
539 }
540 inode->i_mode = raw_inode->i_mode;
541 i_uid_write(inode, raw_inode->i_uid);
542 i_gid_write(inode, raw_inode->i_gid);
543 set_nlink(inode, raw_inode->i_nlinks);
544 inode->i_size = raw_inode->i_size;
545 inode->i_mtime.tv_sec = raw_inode->i_mtime;
546 inode->i_atime.tv_sec = raw_inode->i_atime;
547 inode->i_ctime.tv_sec = raw_inode->i_ctime;
548 inode->i_mtime.tv_nsec = 0;
549 inode->i_atime.tv_nsec = 0;
550 inode->i_ctime.tv_nsec = 0;
551 inode->i_blocks = 0;
552 for (i = 0; i < 10; i++)
553 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
554 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
555 brelse(bh);
556 unlock_new_inode(inode);
557 return inode;
558 }
559
560 /*
561 * The global function to read an inode.
562 */
minix_iget(struct super_block * sb,unsigned long ino)563 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
564 {
565 struct inode *inode;
566
567 inode = iget_locked(sb, ino);
568 if (!inode)
569 return ERR_PTR(-ENOMEM);
570 if (!(inode->i_state & I_NEW))
571 return inode;
572
573 if (INODE_VERSION(inode) == MINIX_V1)
574 return V1_minix_iget(inode);
575 else
576 return V2_minix_iget(inode);
577 }
578
579 /*
580 * The minix V1 function to synchronize an inode.
581 */
V1_minix_update_inode(struct inode * inode)582 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
583 {
584 struct buffer_head * bh;
585 struct minix_inode * raw_inode;
586 struct minix_inode_info *minix_inode = minix_i(inode);
587 int i;
588
589 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
590 if (!raw_inode)
591 return NULL;
592 raw_inode->i_mode = inode->i_mode;
593 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
594 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
595 raw_inode->i_nlinks = inode->i_nlink;
596 raw_inode->i_size = inode->i_size;
597 raw_inode->i_time = inode->i_mtime.tv_sec;
598 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
599 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
600 else for (i = 0; i < 9; i++)
601 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
602 mark_buffer_dirty(bh);
603 return bh;
604 }
605
606 /*
607 * The minix V2 function to synchronize an inode.
608 */
V2_minix_update_inode(struct inode * inode)609 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
610 {
611 struct buffer_head * bh;
612 struct minix2_inode * raw_inode;
613 struct minix_inode_info *minix_inode = minix_i(inode);
614 int i;
615
616 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
617 if (!raw_inode)
618 return NULL;
619 raw_inode->i_mode = inode->i_mode;
620 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
621 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
622 raw_inode->i_nlinks = inode->i_nlink;
623 raw_inode->i_size = inode->i_size;
624 raw_inode->i_mtime = inode->i_mtime.tv_sec;
625 raw_inode->i_atime = inode->i_atime.tv_sec;
626 raw_inode->i_ctime = inode->i_ctime.tv_sec;
627 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
628 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
629 else for (i = 0; i < 10; i++)
630 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
631 mark_buffer_dirty(bh);
632 return bh;
633 }
634
minix_write_inode(struct inode * inode,struct writeback_control * wbc)635 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
636 {
637 int err = 0;
638 struct buffer_head *bh;
639
640 if (INODE_VERSION(inode) == MINIX_V1)
641 bh = V1_minix_update_inode(inode);
642 else
643 bh = V2_minix_update_inode(inode);
644 if (!bh)
645 return -EIO;
646 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
647 sync_dirty_buffer(bh);
648 if (buffer_req(bh) && !buffer_uptodate(bh)) {
649 printk("IO error syncing minix inode [%s:%08lx]\n",
650 inode->i_sb->s_id, inode->i_ino);
651 err = -EIO;
652 }
653 }
654 brelse (bh);
655 return err;
656 }
657
minix_getattr(struct vfsmount * mnt,struct dentry * dentry,struct kstat * stat)658 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
659 {
660 struct super_block *sb = dentry->d_sb;
661 generic_fillattr(d_inode(dentry), stat);
662 if (INODE_VERSION(d_inode(dentry)) == MINIX_V1)
663 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
664 else
665 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
666 stat->blksize = sb->s_blocksize;
667 return 0;
668 }
669
670 /*
671 * The function that is called for file truncation.
672 */
minix_truncate(struct inode * inode)673 void minix_truncate(struct inode * inode)
674 {
675 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
676 return;
677 if (INODE_VERSION(inode) == MINIX_V1)
678 V1_minix_truncate(inode);
679 else
680 V2_minix_truncate(inode);
681 }
682
minix_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)683 static struct dentry *minix_mount(struct file_system_type *fs_type,
684 int flags, const char *dev_name, void *data)
685 {
686 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
687 }
688
689 static struct file_system_type minix_fs_type = {
690 .owner = THIS_MODULE,
691 .name = "minix",
692 .mount = minix_mount,
693 .kill_sb = kill_block_super,
694 .fs_flags = FS_REQUIRES_DEV,
695 };
696 MODULE_ALIAS_FS("minix");
697
init_minix_fs(void)698 static int __init init_minix_fs(void)
699 {
700 int err = init_inodecache();
701 if (err)
702 goto out1;
703 err = register_filesystem(&minix_fs_type);
704 if (err)
705 goto out;
706 return 0;
707 out:
708 destroy_inodecache();
709 out1:
710 return err;
711 }
712
exit_minix_fs(void)713 static void __exit exit_minix_fs(void)
714 {
715 unregister_filesystem(&minix_fs_type);
716 destroy_inodecache();
717 }
718
719 module_init(init_minix_fs)
720 module_exit(exit_minix_fs)
721 MODULE_LICENSE("GPL");
722
723