1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/minix/inode.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * Copyright (C) 1996 Gertjan van Wingerde
8 * Minix V2 fs support.
9 *
10 * Modified for 680x0 by Andreas Schwab
11 * Updated to filesystem version 3 by Daniel Aragones
12 */
13
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
23 static int minix_write_inode(struct inode *inode,
24 struct writeback_control *wbc);
25 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
26 static int minix_remount (struct super_block * sb, int * flags, char * data);
27
minix_evict_inode(struct inode * inode)28 static 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
minix_put_super(struct super_block * sb)41 static 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) /* s_state is now out from V3 sb */
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
61 static struct kmem_cache * minix_inode_cachep;
62
minix_alloc_inode(struct super_block * sb)63 static 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
minix_free_in_core_inode(struct inode * inode)72 static void minix_free_in_core_inode(struct inode *inode)
73 {
74 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75 }
76
init_once(void * foo)77 static 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
init_inodecache(void)84 static 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
destroy_inodecache(void)96 static void destroy_inodecache(void)
97 {
98 /*
99 * Make sure all delayed rcu free inodes are flushed before we
100 * destroy cache.
101 */
102 rcu_barrier();
103 kmem_cache_destroy(minix_inode_cachep);
104 }
105
106 static 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
minix_remount(struct super_block * sb,int * flags,char * data)116 static 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 /* Mounting a rw partition read-only. */
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 /* Mount a partition which is read-only, read-write. */
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
minix_check_superblock(struct super_block * sb)153 static 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 * s_max_size must not exceed the block mapping limitation. This check
162 * is only needed for V1 filesystems, since V2/V3 support an extra level
163 * of indirect blocks which places the limit well above U32_MAX.
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
minix_fill_super(struct super_block * s,void * data,int silent)172 static 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 * Allocate the buffer map to keep the superblock small.
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 /* Apparently minix can create filesystems that allocate more blocks for
279 * the bitmaps than needed. We simply ignore that, but verify it didn't
280 * create one with not enough blocks and bail out if so.
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 /* set up enough so that it can read an inode */
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) /* s_state is now out from V3 sb */
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
327 out_no_root:
328 if (!silent)
329 printk("MINIX-fs: get root inode failed\n");
330 goto out_freemap;
331
332 out_no_bitmap:
333 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
334 out_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
342 out_no_map:
343 ret = -ENOMEM;
344 if (!silent)
345 printk("MINIX-fs: can't allocate map\n");
346 goto out_release;
347
348 out_illegal_sb:
349 if (!silent)
350 printk("MINIX-fs: bad superblock\n");
351 goto out_release;
352
353 out_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);
357 out_release:
358 brelse(bh);
359 goto out;
360
361 out_bad_hblock:
362 printk("MINIX-fs: blocksize too small for device\n");
363 goto out;
364
365 out_bad_sb:
366 printk("MINIX-fs: unable to read superblock\n");
367 out:
368 s->s_fs_info = NULL;
369 kfree(sbi);
370 return ret;
371 }
372
minix_statfs(struct dentry * dentry,struct kstatfs * buf)373 static 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
minix_get_block(struct inode * inode,sector_t block,struct buffer_head * bh_result,int create)391 static 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
minix_writepage(struct page * page,struct writeback_control * wbc)400 static int minix_writepage(struct page *page, struct writeback_control *wbc)
401 {
402 return block_write_full_page(page, minix_get_block, wbc);
403 }
404
minix_readpage(struct file * file,struct page * page)405 static int minix_readpage(struct file *file, struct page *page)
406 {
407 return block_read_full_page(page,minix_get_block);
408 }
409
minix_prepare_chunk(struct page * page,loff_t pos,unsigned len)410 int 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
minix_write_failed(struct address_space * mapping,loff_t to)415 static 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
minix_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned flags,struct page ** pagep,void ** fsdata)425 static 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
minix_bmap(struct address_space * mapping,sector_t block)439 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
440 {
441 return generic_block_bmap(mapping,block,minix_get_block);
442 }
443
444 static const struct address_space_operations minix_aops = {
445 .readpage = minix_readpage,
446 .writepage = minix_writepage,
447 .write_begin = minix_write_begin,
448 .write_end = generic_write_end,
449 .bmap = minix_bmap
450 };
451
452 static const struct inode_operations minix_symlink_inode_operations = {
453 .get_link = page_get_link,
454 .getattr = minix_getattr,
455 };
456
minix_set_inode(struct inode * inode,dev_t rdev)457 void minix_set_inode(struct inode *inode, dev_t rdev)
458 {
459 if (S_ISREG(inode->i_mode)) {
460 inode->i_op = &minix_file_inode_operations;
461 inode->i_fop = &minix_file_operations;
462 inode->i_mapping->a_ops = &minix_aops;
463 } else if (S_ISDIR(inode->i_mode)) {
464 inode->i_op = &minix_dir_inode_operations;
465 inode->i_fop = &minix_dir_operations;
466 inode->i_mapping->a_ops = &minix_aops;
467 } else if (S_ISLNK(inode->i_mode)) {
468 inode->i_op = &minix_symlink_inode_operations;
469 inode_nohighmem(inode);
470 inode->i_mapping->a_ops = &minix_aops;
471 } else
472 init_special_inode(inode, inode->i_mode, rdev);
473 }
474
475 /*
476 * The minix V1 function to read an inode.
477 */
V1_minix_iget(struct inode * inode)478 static struct inode *V1_minix_iget(struct inode *inode)
479 {
480 struct buffer_head * bh;
481 struct minix_inode * raw_inode;
482 struct minix_inode_info *minix_inode = minix_i(inode);
483 int i;
484
485 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
486 if (!raw_inode) {
487 iget_failed(inode);
488 return ERR_PTR(-EIO);
489 }
490 if (raw_inode->i_nlinks == 0) {
491 printk("MINIX-fs: deleted inode referenced: %lu\n",
492 inode->i_ino);
493 brelse(bh);
494 iget_failed(inode);
495 return ERR_PTR(-ESTALE);
496 }
497 inode->i_mode = raw_inode->i_mode;
498 i_uid_write(inode, raw_inode->i_uid);
499 i_gid_write(inode, raw_inode->i_gid);
500 set_nlink(inode, raw_inode->i_nlinks);
501 inode->i_size = raw_inode->i_size;
502 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
503 inode->i_mtime.tv_nsec = 0;
504 inode->i_atime.tv_nsec = 0;
505 inode->i_ctime.tv_nsec = 0;
506 inode->i_blocks = 0;
507 for (i = 0; i < 9; i++)
508 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
509 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
510 brelse(bh);
511 unlock_new_inode(inode);
512 return inode;
513 }
514
515 /*
516 * The minix V2 function to read an inode.
517 */
V2_minix_iget(struct inode * inode)518 static struct inode *V2_minix_iget(struct inode *inode)
519 {
520 struct buffer_head * bh;
521 struct minix2_inode * raw_inode;
522 struct minix_inode_info *minix_inode = minix_i(inode);
523 int i;
524
525 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
526 if (!raw_inode) {
527 iget_failed(inode);
528 return ERR_PTR(-EIO);
529 }
530 if (raw_inode->i_nlinks == 0) {
531 printk("MINIX-fs: deleted inode referenced: %lu\n",
532 inode->i_ino);
533 brelse(bh);
534 iget_failed(inode);
535 return ERR_PTR(-ESTALE);
536 }
537 inode->i_mode = raw_inode->i_mode;
538 i_uid_write(inode, raw_inode->i_uid);
539 i_gid_write(inode, raw_inode->i_gid);
540 set_nlink(inode, raw_inode->i_nlinks);
541 inode->i_size = raw_inode->i_size;
542 inode->i_mtime.tv_sec = raw_inode->i_mtime;
543 inode->i_atime.tv_sec = raw_inode->i_atime;
544 inode->i_ctime.tv_sec = raw_inode->i_ctime;
545 inode->i_mtime.tv_nsec = 0;
546 inode->i_atime.tv_nsec = 0;
547 inode->i_ctime.tv_nsec = 0;
548 inode->i_blocks = 0;
549 for (i = 0; i < 10; i++)
550 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
551 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
552 brelse(bh);
553 unlock_new_inode(inode);
554 return inode;
555 }
556
557 /*
558 * The global function to read an inode.
559 */
minix_iget(struct super_block * sb,unsigned long ino)560 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
561 {
562 struct inode *inode;
563
564 inode = iget_locked(sb, ino);
565 if (!inode)
566 return ERR_PTR(-ENOMEM);
567 if (!(inode->i_state & I_NEW))
568 return inode;
569
570 if (INODE_VERSION(inode) == MINIX_V1)
571 return V1_minix_iget(inode);
572 else
573 return V2_minix_iget(inode);
574 }
575
576 /*
577 * The minix V1 function to synchronize an inode.
578 */
V1_minix_update_inode(struct inode * inode)579 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
580 {
581 struct buffer_head * bh;
582 struct minix_inode * raw_inode;
583 struct minix_inode_info *minix_inode = minix_i(inode);
584 int i;
585
586 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
587 if (!raw_inode)
588 return NULL;
589 raw_inode->i_mode = inode->i_mode;
590 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
591 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
592 raw_inode->i_nlinks = inode->i_nlink;
593 raw_inode->i_size = inode->i_size;
594 raw_inode->i_time = inode->i_mtime.tv_sec;
595 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
596 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
597 else for (i = 0; i < 9; i++)
598 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
599 mark_buffer_dirty(bh);
600 return bh;
601 }
602
603 /*
604 * The minix V2 function to synchronize an inode.
605 */
V2_minix_update_inode(struct inode * inode)606 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
607 {
608 struct buffer_head * bh;
609 struct minix2_inode * raw_inode;
610 struct minix_inode_info *minix_inode = minix_i(inode);
611 int i;
612
613 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
614 if (!raw_inode)
615 return NULL;
616 raw_inode->i_mode = inode->i_mode;
617 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
618 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
619 raw_inode->i_nlinks = inode->i_nlink;
620 raw_inode->i_size = inode->i_size;
621 raw_inode->i_mtime = inode->i_mtime.tv_sec;
622 raw_inode->i_atime = inode->i_atime.tv_sec;
623 raw_inode->i_ctime = inode->i_ctime.tv_sec;
624 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
625 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
626 else for (i = 0; i < 10; i++)
627 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
628 mark_buffer_dirty(bh);
629 return bh;
630 }
631
minix_write_inode(struct inode * inode,struct writeback_control * wbc)632 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
633 {
634 int err = 0;
635 struct buffer_head *bh;
636
637 if (INODE_VERSION(inode) == MINIX_V1)
638 bh = V1_minix_update_inode(inode);
639 else
640 bh = V2_minix_update_inode(inode);
641 if (!bh)
642 return -EIO;
643 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
644 sync_dirty_buffer(bh);
645 if (buffer_req(bh) && !buffer_uptodate(bh)) {
646 printk("IO error syncing minix inode [%s:%08lx]\n",
647 inode->i_sb->s_id, inode->i_ino);
648 err = -EIO;
649 }
650 }
651 brelse (bh);
652 return err;
653 }
654
minix_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)655 int minix_getattr(const struct path *path, struct kstat *stat,
656 u32 request_mask, unsigned int flags)
657 {
658 struct super_block *sb = path->dentry->d_sb;
659 struct inode *inode = d_inode(path->dentry);
660
661 generic_fillattr(inode, stat);
662 if (INODE_VERSION(inode) == 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