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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
22static int minix_write_inode(struct inode *inode,
23 struct writeback_control *wbc);
24static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
25static int minix_remount (struct super_block * sb, int * flags, char * data);
26
27static 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
40static 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
60static struct kmem_cache * minix_inode_cachep;
61
62static struct inode *minix_alloc_inode(struct super_block *sb)
63{
64 struct minix_inode_info *ei;
65 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
66 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69}
70
71static 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
77static void minix_destroy_inode(struct inode *inode)
78{
79 call_rcu(&inode->i_rcu, minix_i_callback);
80}
81
82static 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
89static 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
101static 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
111static 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
121static 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
158static int minix_fill_super(struct super_block *s, void *data, int silent)
159{
160 struct buffer_head *bh;
161 struct buffer_head **map;
162 struct minix_super_block *ms;
163 struct minix3_super_block *m3s = NULL;
164 unsigned long i, block;
165 struct inode *root_inode;
166 struct minix_sb_info *sbi;
167 int ret = -EINVAL;
168
169 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
170 if (!sbi)
171 return -ENOMEM;
172 s->s_fs_info = sbi;
173
174 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
175 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
176
177 if (!sb_set_blocksize(s, BLOCK_SIZE))
178 goto out_bad_hblock;
179
180 if (!(bh = sb_bread(s, 1)))
181 goto out_bad_sb;
182
183 ms = (struct minix_super_block *) bh->b_data;
184 sbi->s_ms = ms;
185 sbi->s_sbh = bh;
186 sbi->s_mount_state = ms->s_state;
187 sbi->s_ninodes = ms->s_ninodes;
188 sbi->s_nzones = ms->s_nzones;
189 sbi->s_imap_blocks = ms->s_imap_blocks;
190 sbi->s_zmap_blocks = ms->s_zmap_blocks;
191 sbi->s_firstdatazone = ms->s_firstdatazone;
192 sbi->s_log_zone_size = ms->s_log_zone_size;
193 sbi->s_max_size = ms->s_max_size;
194 s->s_magic = ms->s_magic;
195 if (s->s_magic == MINIX_SUPER_MAGIC) {
196 sbi->s_version = MINIX_V1;
197 sbi->s_dirsize = 16;
198 sbi->s_namelen = 14;
199 s->s_max_links = MINIX_LINK_MAX;
200 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
201 sbi->s_version = MINIX_V1;
202 sbi->s_dirsize = 32;
203 sbi->s_namelen = 30;
204 s->s_max_links = MINIX_LINK_MAX;
205 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
206 sbi->s_version = MINIX_V2;
207 sbi->s_nzones = ms->s_zones;
208 sbi->s_dirsize = 16;
209 sbi->s_namelen = 14;
210 s->s_max_links = MINIX2_LINK_MAX;
211 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
212 sbi->s_version = MINIX_V2;
213 sbi->s_nzones = ms->s_zones;
214 sbi->s_dirsize = 32;
215 sbi->s_namelen = 30;
216 s->s_max_links = MINIX2_LINK_MAX;
217 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
218 m3s = (struct minix3_super_block *) bh->b_data;
219 s->s_magic = m3s->s_magic;
220 sbi->s_imap_blocks = m3s->s_imap_blocks;
221 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
222 sbi->s_firstdatazone = m3s->s_firstdatazone;
223 sbi->s_log_zone_size = m3s->s_log_zone_size;
224 sbi->s_max_size = m3s->s_max_size;
225 sbi->s_ninodes = m3s->s_ninodes;
226 sbi->s_nzones = m3s->s_zones;
227 sbi->s_dirsize = 64;
228 sbi->s_namelen = 60;
229 sbi->s_version = MINIX_V3;
230 sbi->s_mount_state = MINIX_VALID_FS;
231 sb_set_blocksize(s, m3s->s_blocksize);
232 s->s_max_links = MINIX2_LINK_MAX;
233 } else
234 goto out_no_fs;
235
236 /*
237 * Allocate the buffer map to keep the superblock small.
238 */
239 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
240 goto out_illegal_sb;
241 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
242 map = kzalloc(i, GFP_KERNEL);
243 if (!map)
244 goto out_no_map;
245 sbi->s_imap = &map[0];
246 sbi->s_zmap = &map[sbi->s_imap_blocks];
247
248 block=2;
249 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
250 if (!(sbi->s_imap[i]=sb_bread(s, block)))
251 goto out_no_bitmap;
252 block++;
253 }
254 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
255 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
256 goto out_no_bitmap;
257 block++;
258 }
259
260 minix_set_bit(0,sbi->s_imap[0]->b_data);
261 minix_set_bit(0,sbi->s_zmap[0]->b_data);
262
263 /* Apparently minix can create filesystems that allocate more blocks for
264 * the bitmaps than needed. We simply ignore that, but verify it didn't
265 * create one with not enough blocks and bail out if so.
266 */
267 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
268 if (sbi->s_imap_blocks < block) {
269 printk("MINIX-fs: file system does not have enough "
270 "imap blocks allocated. Refusing to mount\n");
271 goto out_no_bitmap;
272 }
273
274 block = minix_blocks_needed(
275 (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
276 s->s_blocksize);
277 if (sbi->s_zmap_blocks < block) {
278 printk("MINIX-fs: file system does not have enough "
279 "zmap blocks allocated. Refusing to mount.\n");
280 goto out_no_bitmap;
281 }
282
283 /* set up enough so that it can read an inode */
284 s->s_op = &minix_sops;
285 root_inode = minix_iget(s, MINIX_ROOT_INO);
286 if (IS_ERR(root_inode)) {
287 ret = PTR_ERR(root_inode);
288 goto out_no_root;
289 }
290
291 ret = -ENOMEM;
292 s->s_root = d_make_root(root_inode);
293 if (!s->s_root)
294 goto out_no_root;
295
296 if (!(s->s_flags & MS_RDONLY)) {
297 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
298 ms->s_state &= ~MINIX_VALID_FS;
299 mark_buffer_dirty(bh);
300 }
301 if (!(sbi->s_mount_state & MINIX_VALID_FS))
302 printk("MINIX-fs: mounting unchecked file system, "
303 "running fsck is recommended\n");
304 else if (sbi->s_mount_state & MINIX_ERROR_FS)
305 printk("MINIX-fs: mounting file system with errors, "
306 "running fsck is recommended\n");
307
308 return 0;
309
310out_no_root:
311 if (!silent)
312 printk("MINIX-fs: get root inode failed\n");
313 goto out_freemap;
314
315out_no_bitmap:
316 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
317out_freemap:
318 for (i = 0; i < sbi->s_imap_blocks; i++)
319 brelse(sbi->s_imap[i]);
320 for (i = 0; i < sbi->s_zmap_blocks; i++)
321 brelse(sbi->s_zmap[i]);
322 kfree(sbi->s_imap);
323 goto out_release;
324
325out_no_map:
326 ret = -ENOMEM;
327 if (!silent)
328 printk("MINIX-fs: can't allocate map\n");
329 goto out_release;
330
331out_illegal_sb:
332 if (!silent)
333 printk("MINIX-fs: bad superblock\n");
334 goto out_release;
335
336out_no_fs:
337 if (!silent)
338 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
339 "on device %s.\n", s->s_id);
340out_release:
341 brelse(bh);
342 goto out;
343
344out_bad_hblock:
345 printk("MINIX-fs: blocksize too small for device\n");
346 goto out;
347
348out_bad_sb:
349 printk("MINIX-fs: unable to read superblock\n");
350out:
351 s->s_fs_info = NULL;
352 kfree(sbi);
353 return ret;
354}
355
356static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
357{
358 struct super_block *sb = dentry->d_sb;
359 struct minix_sb_info *sbi = minix_sb(sb);
360 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
361 buf->f_type = sb->s_magic;
362 buf->f_bsize = sb->s_blocksize;
363 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
364 buf->f_bfree = minix_count_free_blocks(sb);
365 buf->f_bavail = buf->f_bfree;
366 buf->f_files = sbi->s_ninodes;
367 buf->f_ffree = minix_count_free_inodes(sb);
368 buf->f_namelen = sbi->s_namelen;
369 buf->f_fsid.val[0] = (u32)id;
370 buf->f_fsid.val[1] = (u32)(id >> 32);
371
372 return 0;
373}
374
375static int minix_get_block(struct inode *inode, sector_t block,
376 struct buffer_head *bh_result, int create)
377{
378 if (INODE_VERSION(inode) == MINIX_V1)
379 return V1_minix_get_block(inode, block, bh_result, create);
380 else
381 return V2_minix_get_block(inode, block, bh_result, create);
382}
383
384static int minix_writepage(struct page *page, struct writeback_control *wbc)
385{
386 return block_write_full_page(page, minix_get_block, wbc);
387}
388
389static int minix_readpage(struct file *file, struct page *page)
390{
391 return block_read_full_page(page,minix_get_block);
392}
393
394int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
395{
396 return __block_write_begin(page, pos, len, minix_get_block);
397}
398
399static void minix_write_failed(struct address_space *mapping, loff_t to)
400{
401 struct inode *inode = mapping->host;
402
403 if (to > inode->i_size) {
404 truncate_pagecache(inode, inode->i_size);
405 minix_truncate(inode);
406 }
407}
408
409static int minix_write_begin(struct file *file, struct address_space *mapping,
410 loff_t pos, unsigned len, unsigned flags,
411 struct page **pagep, void **fsdata)
412{
413 int ret;
414
415 ret = block_write_begin(mapping, pos, len, flags, pagep,
416 minix_get_block);
417 if (unlikely(ret))
418 minix_write_failed(mapping, pos + len);
419
420 return ret;
421}
422
423static sector_t minix_bmap(struct address_space *mapping, sector_t block)
424{
425 return generic_block_bmap(mapping,block,minix_get_block);
426}
427
428static const struct address_space_operations minix_aops = {
429 .readpage = minix_readpage,
430 .writepage = minix_writepage,
431 .write_begin = minix_write_begin,
432 .write_end = generic_write_end,
433 .bmap = minix_bmap
434};
435
436static const struct inode_operations minix_symlink_inode_operations = {
437 .readlink = generic_readlink,
438 .follow_link = page_follow_link_light,
439 .put_link = page_put_link,
440 .getattr = minix_getattr,
441};
442
443void minix_set_inode(struct inode *inode, dev_t rdev)
444{
445 if (S_ISREG(inode->i_mode)) {
446 inode->i_op = &minix_file_inode_operations;
447 inode->i_fop = &minix_file_operations;
448 inode->i_mapping->a_ops = &minix_aops;
449 } else if (S_ISDIR(inode->i_mode)) {
450 inode->i_op = &minix_dir_inode_operations;
451 inode->i_fop = &minix_dir_operations;
452 inode->i_mapping->a_ops = &minix_aops;
453 } else if (S_ISLNK(inode->i_mode)) {
454 inode->i_op = &minix_symlink_inode_operations;
455 inode->i_mapping->a_ops = &minix_aops;
456 } else
457 init_special_inode(inode, inode->i_mode, rdev);
458}
459
460/*
461 * The minix V1 function to read an inode.
462 */
463static struct inode *V1_minix_iget(struct inode *inode)
464{
465 struct buffer_head * bh;
466 struct minix_inode * raw_inode;
467 struct minix_inode_info *minix_inode = minix_i(inode);
468 int i;
469
470 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
471 if (!raw_inode) {
472 iget_failed(inode);
473 return ERR_PTR(-EIO);
474 }
475 inode->i_mode = raw_inode->i_mode;
476 i_uid_write(inode, raw_inode->i_uid);
477 i_gid_write(inode, raw_inode->i_gid);
478 set_nlink(inode, raw_inode->i_nlinks);
479 inode->i_size = raw_inode->i_size;
480 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
481 inode->i_mtime.tv_nsec = 0;
482 inode->i_atime.tv_nsec = 0;
483 inode->i_ctime.tv_nsec = 0;
484 inode->i_blocks = 0;
485 for (i = 0; i < 9; i++)
486 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
487 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
488 brelse(bh);
489 unlock_new_inode(inode);
490 return inode;
491}
492
493/*
494 * The minix V2 function to read an inode.
495 */
496static struct inode *V2_minix_iget(struct inode *inode)
497{
498 struct buffer_head * bh;
499 struct minix2_inode * raw_inode;
500 struct minix_inode_info *minix_inode = minix_i(inode);
501 int i;
502
503 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
504 if (!raw_inode) {
505 iget_failed(inode);
506 return ERR_PTR(-EIO);
507 }
508 inode->i_mode = raw_inode->i_mode;
509 i_uid_write(inode, raw_inode->i_uid);
510 i_gid_write(inode, raw_inode->i_gid);
511 set_nlink(inode, raw_inode->i_nlinks);
512 inode->i_size = raw_inode->i_size;
513 inode->i_mtime.tv_sec = raw_inode->i_mtime;
514 inode->i_atime.tv_sec = raw_inode->i_atime;
515 inode->i_ctime.tv_sec = raw_inode->i_ctime;
516 inode->i_mtime.tv_nsec = 0;
517 inode->i_atime.tv_nsec = 0;
518 inode->i_ctime.tv_nsec = 0;
519 inode->i_blocks = 0;
520 for (i = 0; i < 10; i++)
521 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
522 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
523 brelse(bh);
524 unlock_new_inode(inode);
525 return inode;
526}
527
528/*
529 * The global function to read an inode.
530 */
531struct inode *minix_iget(struct super_block *sb, unsigned long ino)
532{
533 struct inode *inode;
534
535 inode = iget_locked(sb, ino);
536 if (!inode)
537 return ERR_PTR(-ENOMEM);
538 if (!(inode->i_state & I_NEW))
539 return inode;
540
541 if (INODE_VERSION(inode) == MINIX_V1)
542 return V1_minix_iget(inode);
543 else
544 return V2_minix_iget(inode);
545}
546
547/*
548 * The minix V1 function to synchronize an inode.
549 */
550static struct buffer_head * V1_minix_update_inode(struct inode * inode)
551{
552 struct buffer_head * bh;
553 struct minix_inode * raw_inode;
554 struct minix_inode_info *minix_inode = minix_i(inode);
555 int i;
556
557 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
558 if (!raw_inode)
559 return NULL;
560 raw_inode->i_mode = inode->i_mode;
561 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
562 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
563 raw_inode->i_nlinks = inode->i_nlink;
564 raw_inode->i_size = inode->i_size;
565 raw_inode->i_time = inode->i_mtime.tv_sec;
566 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
567 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
568 else for (i = 0; i < 9; i++)
569 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
570 mark_buffer_dirty(bh);
571 return bh;
572}
573
574/*
575 * The minix V2 function to synchronize an inode.
576 */
577static struct buffer_head * V2_minix_update_inode(struct inode * inode)
578{
579 struct buffer_head * bh;
580 struct minix2_inode * raw_inode;
581 struct minix_inode_info *minix_inode = minix_i(inode);
582 int i;
583
584 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
585 if (!raw_inode)
586 return NULL;
587 raw_inode->i_mode = inode->i_mode;
588 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
589 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
590 raw_inode->i_nlinks = inode->i_nlink;
591 raw_inode->i_size = inode->i_size;
592 raw_inode->i_mtime = inode->i_mtime.tv_sec;
593 raw_inode->i_atime = inode->i_atime.tv_sec;
594 raw_inode->i_ctime = inode->i_ctime.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 < 10; i++)
598 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
599 mark_buffer_dirty(bh);
600 return bh;
601}
602
603static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
604{
605 int err = 0;
606 struct buffer_head *bh;
607
608 if (INODE_VERSION(inode) == MINIX_V1)
609 bh = V1_minix_update_inode(inode);
610 else
611 bh = V2_minix_update_inode(inode);
612 if (!bh)
613 return -EIO;
614 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
615 sync_dirty_buffer(bh);
616 if (buffer_req(bh) && !buffer_uptodate(bh)) {
617 printk("IO error syncing minix inode [%s:%08lx]\n",
618 inode->i_sb->s_id, inode->i_ino);
619 err = -EIO;
620 }
621 }
622 brelse (bh);
623 return err;
624}
625
626int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
627{
628 struct super_block *sb = dentry->d_sb;
629 generic_fillattr(dentry->d_inode, stat);
630 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
631 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
632 else
633 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
634 stat->blksize = sb->s_blocksize;
635 return 0;
636}
637
638/*
639 * The function that is called for file truncation.
640 */
641void minix_truncate(struct inode * inode)
642{
643 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
644 return;
645 if (INODE_VERSION(inode) == MINIX_V1)
646 V1_minix_truncate(inode);
647 else
648 V2_minix_truncate(inode);
649}
650
651static struct dentry *minix_mount(struct file_system_type *fs_type,
652 int flags, const char *dev_name, void *data)
653{
654 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
655}
656
657static struct file_system_type minix_fs_type = {
658 .owner = THIS_MODULE,
659 .name = "minix",
660 .mount = minix_mount,
661 .kill_sb = kill_block_super,
662 .fs_flags = FS_REQUIRES_DEV,
663};
664MODULE_ALIAS_FS("minix");
665
666static int __init init_minix_fs(void)
667{
668 int err = init_inodecache();
669 if (err)
670 goto out1;
671 err = register_filesystem(&minix_fs_type);
672 if (err)
673 goto out;
674 return 0;
675out:
676 destroy_inodecache();
677out1:
678 return err;
679}
680
681static void __exit exit_minix_fs(void)
682{
683 unregister_filesystem(&minix_fs_type);
684 destroy_inodecache();
685}
686
687module_init(init_minix_fs)
688module_exit(exit_minix_fs)
689MODULE_LICENSE("GPL");
690
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
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) /* 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
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 * 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
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 /* 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
153static int minix_fill_super(struct super_block *s, void *data, int silent)
154{
155 struct buffer_head *bh;
156 struct buffer_head **map;
157 struct minix_super_block *ms;
158 struct minix3_super_block *m3s = NULL;
159 unsigned long i, block;
160 struct inode *root_inode;
161 struct minix_sb_info *sbi;
162 int ret = -EINVAL;
163
164 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
165 if (!sbi)
166 return -ENOMEM;
167 s->s_fs_info = sbi;
168
169 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
170 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
171
172 if (!sb_set_blocksize(s, BLOCK_SIZE))
173 goto out_bad_hblock;
174
175 if (!(bh = sb_bread(s, 1)))
176 goto out_bad_sb;
177
178 ms = (struct minix_super_block *) bh->b_data;
179 sbi->s_ms = ms;
180 sbi->s_sbh = bh;
181 sbi->s_mount_state = ms->s_state;
182 sbi->s_ninodes = ms->s_ninodes;
183 sbi->s_nzones = ms->s_nzones;
184 sbi->s_imap_blocks = ms->s_imap_blocks;
185 sbi->s_zmap_blocks = ms->s_zmap_blocks;
186 sbi->s_firstdatazone = ms->s_firstdatazone;
187 sbi->s_log_zone_size = ms->s_log_zone_size;
188 sbi->s_max_size = ms->s_max_size;
189 s->s_magic = ms->s_magic;
190 if (s->s_magic == MINIX_SUPER_MAGIC) {
191 sbi->s_version = MINIX_V1;
192 sbi->s_dirsize = 16;
193 sbi->s_namelen = 14;
194 s->s_max_links = MINIX_LINK_MAX;
195 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V1;
197 sbi->s_dirsize = 32;
198 sbi->s_namelen = 30;
199 s->s_max_links = MINIX_LINK_MAX;
200 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
201 sbi->s_version = MINIX_V2;
202 sbi->s_nzones = ms->s_zones;
203 sbi->s_dirsize = 16;
204 sbi->s_namelen = 14;
205 s->s_max_links = MINIX2_LINK_MAX;
206 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
207 sbi->s_version = MINIX_V2;
208 sbi->s_nzones = ms->s_zones;
209 sbi->s_dirsize = 32;
210 sbi->s_namelen = 30;
211 s->s_max_links = MINIX2_LINK_MAX;
212 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
213 m3s = (struct minix3_super_block *) bh->b_data;
214 s->s_magic = m3s->s_magic;
215 sbi->s_imap_blocks = m3s->s_imap_blocks;
216 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
217 sbi->s_firstdatazone = m3s->s_firstdatazone;
218 sbi->s_log_zone_size = m3s->s_log_zone_size;
219 sbi->s_max_size = m3s->s_max_size;
220 sbi->s_ninodes = m3s->s_ninodes;
221 sbi->s_nzones = m3s->s_zones;
222 sbi->s_dirsize = 64;
223 sbi->s_namelen = 60;
224 sbi->s_version = MINIX_V3;
225 sbi->s_mount_state = MINIX_VALID_FS;
226 sb_set_blocksize(s, m3s->s_blocksize);
227 s->s_max_links = MINIX2_LINK_MAX;
228 } else
229 goto out_no_fs;
230
231 /*
232 * Allocate the buffer map to keep the superblock small.
233 */
234 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
235 goto out_illegal_sb;
236 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
237 map = kzalloc(i, GFP_KERNEL);
238 if (!map)
239 goto out_no_map;
240 sbi->s_imap = &map[0];
241 sbi->s_zmap = &map[sbi->s_imap_blocks];
242
243 block=2;
244 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
245 if (!(sbi->s_imap[i]=sb_bread(s, block)))
246 goto out_no_bitmap;
247 block++;
248 }
249 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
250 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
251 goto out_no_bitmap;
252 block++;
253 }
254
255 minix_set_bit(0,sbi->s_imap[0]->b_data);
256 minix_set_bit(0,sbi->s_zmap[0]->b_data);
257
258 /* Apparently minix can create filesystems that allocate more blocks for
259 * the bitmaps than needed. We simply ignore that, but verify it didn't
260 * create one with not enough blocks and bail out if so.
261 */
262 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
263 if (sbi->s_imap_blocks < block) {
264 printk("MINIX-fs: file system does not have enough "
265 "imap blocks allocated. Refusing to mount.\n");
266 goto out_no_bitmap;
267 }
268
269 block = minix_blocks_needed(
270 (sbi->s_nzones - sbi->s_firstdatazone + 1),
271 s->s_blocksize);
272 if (sbi->s_zmap_blocks < block) {
273 printk("MINIX-fs: file system does not have enough "
274 "zmap blocks allocated. Refusing to mount.\n");
275 goto out_no_bitmap;
276 }
277
278 /* set up enough so that it can read an inode */
279 s->s_op = &minix_sops;
280 s->s_time_min = 0;
281 s->s_time_max = U32_MAX;
282 root_inode = minix_iget(s, MINIX_ROOT_INO);
283 if (IS_ERR(root_inode)) {
284 ret = PTR_ERR(root_inode);
285 goto out_no_root;
286 }
287
288 ret = -ENOMEM;
289 s->s_root = d_make_root(root_inode);
290 if (!s->s_root)
291 goto out_no_root;
292
293 if (!sb_rdonly(s)) {
294 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
295 ms->s_state &= ~MINIX_VALID_FS;
296 mark_buffer_dirty(bh);
297 }
298 if (!(sbi->s_mount_state & MINIX_VALID_FS))
299 printk("MINIX-fs: mounting unchecked file system, "
300 "running fsck is recommended\n");
301 else if (sbi->s_mount_state & MINIX_ERROR_FS)
302 printk("MINIX-fs: mounting file system with errors, "
303 "running fsck is recommended\n");
304
305 return 0;
306
307out_no_root:
308 if (!silent)
309 printk("MINIX-fs: get root inode failed\n");
310 goto out_freemap;
311
312out_no_bitmap:
313 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
314out_freemap:
315 for (i = 0; i < sbi->s_imap_blocks; i++)
316 brelse(sbi->s_imap[i]);
317 for (i = 0; i < sbi->s_zmap_blocks; i++)
318 brelse(sbi->s_zmap[i]);
319 kfree(sbi->s_imap);
320 goto out_release;
321
322out_no_map:
323 ret = -ENOMEM;
324 if (!silent)
325 printk("MINIX-fs: can't allocate map\n");
326 goto out_release;
327
328out_illegal_sb:
329 if (!silent)
330 printk("MINIX-fs: bad superblock\n");
331 goto out_release;
332
333out_no_fs:
334 if (!silent)
335 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
336 "on device %s.\n", s->s_id);
337out_release:
338 brelse(bh);
339 goto out;
340
341out_bad_hblock:
342 printk("MINIX-fs: blocksize too small for device\n");
343 goto out;
344
345out_bad_sb:
346 printk("MINIX-fs: unable to read superblock\n");
347out:
348 s->s_fs_info = NULL;
349 kfree(sbi);
350 return ret;
351}
352
353static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
354{
355 struct super_block *sb = dentry->d_sb;
356 struct minix_sb_info *sbi = minix_sb(sb);
357 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
358 buf->f_type = sb->s_magic;
359 buf->f_bsize = sb->s_blocksize;
360 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
361 buf->f_bfree = minix_count_free_blocks(sb);
362 buf->f_bavail = buf->f_bfree;
363 buf->f_files = sbi->s_ninodes;
364 buf->f_ffree = minix_count_free_inodes(sb);
365 buf->f_namelen = sbi->s_namelen;
366 buf->f_fsid.val[0] = (u32)id;
367 buf->f_fsid.val[1] = (u32)(id >> 32);
368
369 return 0;
370}
371
372static int minix_get_block(struct inode *inode, sector_t block,
373 struct buffer_head *bh_result, int create)
374{
375 if (INODE_VERSION(inode) == MINIX_V1)
376 return V1_minix_get_block(inode, block, bh_result, create);
377 else
378 return V2_minix_get_block(inode, block, bh_result, create);
379}
380
381static int minix_writepage(struct page *page, struct writeback_control *wbc)
382{
383 return block_write_full_page(page, minix_get_block, wbc);
384}
385
386static int minix_readpage(struct file *file, struct page *page)
387{
388 return block_read_full_page(page,minix_get_block);
389}
390
391int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
392{
393 return __block_write_begin(page, pos, len, minix_get_block);
394}
395
396static void minix_write_failed(struct address_space *mapping, loff_t to)
397{
398 struct inode *inode = mapping->host;
399
400 if (to > inode->i_size) {
401 truncate_pagecache(inode, inode->i_size);
402 minix_truncate(inode);
403 }
404}
405
406static int minix_write_begin(struct file *file, struct address_space *mapping,
407 loff_t pos, unsigned len, unsigned flags,
408 struct page **pagep, void **fsdata)
409{
410 int ret;
411
412 ret = block_write_begin(mapping, pos, len, flags, pagep,
413 minix_get_block);
414 if (unlikely(ret))
415 minix_write_failed(mapping, pos + len);
416
417 return ret;
418}
419
420static sector_t minix_bmap(struct address_space *mapping, sector_t block)
421{
422 return generic_block_bmap(mapping,block,minix_get_block);
423}
424
425static const struct address_space_operations minix_aops = {
426 .readpage = minix_readpage,
427 .writepage = minix_writepage,
428 .write_begin = minix_write_begin,
429 .write_end = generic_write_end,
430 .bmap = minix_bmap
431};
432
433static const struct inode_operations minix_symlink_inode_operations = {
434 .get_link = page_get_link,
435 .getattr = minix_getattr,
436};
437
438void minix_set_inode(struct inode *inode, dev_t rdev)
439{
440 if (S_ISREG(inode->i_mode)) {
441 inode->i_op = &minix_file_inode_operations;
442 inode->i_fop = &minix_file_operations;
443 inode->i_mapping->a_ops = &minix_aops;
444 } else if (S_ISDIR(inode->i_mode)) {
445 inode->i_op = &minix_dir_inode_operations;
446 inode->i_fop = &minix_dir_operations;
447 inode->i_mapping->a_ops = &minix_aops;
448 } else if (S_ISLNK(inode->i_mode)) {
449 inode->i_op = &minix_symlink_inode_operations;
450 inode_nohighmem(inode);
451 inode->i_mapping->a_ops = &minix_aops;
452 } else
453 init_special_inode(inode, inode->i_mode, rdev);
454}
455
456/*
457 * The minix V1 function to read an inode.
458 */
459static struct inode *V1_minix_iget(struct inode *inode)
460{
461 struct buffer_head * bh;
462 struct minix_inode * raw_inode;
463 struct minix_inode_info *minix_inode = minix_i(inode);
464 int i;
465
466 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
467 if (!raw_inode) {
468 iget_failed(inode);
469 return ERR_PTR(-EIO);
470 }
471 inode->i_mode = raw_inode->i_mode;
472 i_uid_write(inode, raw_inode->i_uid);
473 i_gid_write(inode, raw_inode->i_gid);
474 set_nlink(inode, raw_inode->i_nlinks);
475 inode->i_size = raw_inode->i_size;
476 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
477 inode->i_mtime.tv_nsec = 0;
478 inode->i_atime.tv_nsec = 0;
479 inode->i_ctime.tv_nsec = 0;
480 inode->i_blocks = 0;
481 for (i = 0; i < 9; i++)
482 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
483 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
484 brelse(bh);
485 unlock_new_inode(inode);
486 return inode;
487}
488
489/*
490 * The minix V2 function to read an inode.
491 */
492static struct inode *V2_minix_iget(struct inode *inode)
493{
494 struct buffer_head * bh;
495 struct minix2_inode * raw_inode;
496 struct minix_inode_info *minix_inode = minix_i(inode);
497 int i;
498
499 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
500 if (!raw_inode) {
501 iget_failed(inode);
502 return ERR_PTR(-EIO);
503 }
504 inode->i_mode = raw_inode->i_mode;
505 i_uid_write(inode, raw_inode->i_uid);
506 i_gid_write(inode, raw_inode->i_gid);
507 set_nlink(inode, raw_inode->i_nlinks);
508 inode->i_size = raw_inode->i_size;
509 inode->i_mtime.tv_sec = raw_inode->i_mtime;
510 inode->i_atime.tv_sec = raw_inode->i_atime;
511 inode->i_ctime.tv_sec = raw_inode->i_ctime;
512 inode->i_mtime.tv_nsec = 0;
513 inode->i_atime.tv_nsec = 0;
514 inode->i_ctime.tv_nsec = 0;
515 inode->i_blocks = 0;
516 for (i = 0; i < 10; i++)
517 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
518 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
519 brelse(bh);
520 unlock_new_inode(inode);
521 return inode;
522}
523
524/*
525 * The global function to read an inode.
526 */
527struct inode *minix_iget(struct super_block *sb, unsigned long ino)
528{
529 struct inode *inode;
530
531 inode = iget_locked(sb, ino);
532 if (!inode)
533 return ERR_PTR(-ENOMEM);
534 if (!(inode->i_state & I_NEW))
535 return inode;
536
537 if (INODE_VERSION(inode) == MINIX_V1)
538 return V1_minix_iget(inode);
539 else
540 return V2_minix_iget(inode);
541}
542
543/*
544 * The minix V1 function to synchronize an inode.
545 */
546static struct buffer_head * V1_minix_update_inode(struct inode * inode)
547{
548 struct buffer_head * bh;
549 struct minix_inode * raw_inode;
550 struct minix_inode_info *minix_inode = minix_i(inode);
551 int i;
552
553 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
554 if (!raw_inode)
555 return NULL;
556 raw_inode->i_mode = inode->i_mode;
557 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
558 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
559 raw_inode->i_nlinks = inode->i_nlink;
560 raw_inode->i_size = inode->i_size;
561 raw_inode->i_time = inode->i_mtime.tv_sec;
562 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
563 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
564 else for (i = 0; i < 9; i++)
565 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
566 mark_buffer_dirty(bh);
567 return bh;
568}
569
570/*
571 * The minix V2 function to synchronize an inode.
572 */
573static struct buffer_head * V2_minix_update_inode(struct inode * inode)
574{
575 struct buffer_head * bh;
576 struct minix2_inode * raw_inode;
577 struct minix_inode_info *minix_inode = minix_i(inode);
578 int i;
579
580 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
581 if (!raw_inode)
582 return NULL;
583 raw_inode->i_mode = inode->i_mode;
584 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
585 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
586 raw_inode->i_nlinks = inode->i_nlink;
587 raw_inode->i_size = inode->i_size;
588 raw_inode->i_mtime = inode->i_mtime.tv_sec;
589 raw_inode->i_atime = inode->i_atime.tv_sec;
590 raw_inode->i_ctime = inode->i_ctime.tv_sec;
591 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
592 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
593 else for (i = 0; i < 10; i++)
594 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
595 mark_buffer_dirty(bh);
596 return bh;
597}
598
599static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
600{
601 int err = 0;
602 struct buffer_head *bh;
603
604 if (INODE_VERSION(inode) == MINIX_V1)
605 bh = V1_minix_update_inode(inode);
606 else
607 bh = V2_minix_update_inode(inode);
608 if (!bh)
609 return -EIO;
610 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
611 sync_dirty_buffer(bh);
612 if (buffer_req(bh) && !buffer_uptodate(bh)) {
613 printk("IO error syncing minix inode [%s:%08lx]\n",
614 inode->i_sb->s_id, inode->i_ino);
615 err = -EIO;
616 }
617 }
618 brelse (bh);
619 return err;
620}
621
622int minix_getattr(const struct path *path, struct kstat *stat,
623 u32 request_mask, unsigned int flags)
624{
625 struct super_block *sb = path->dentry->d_sb;
626 struct inode *inode = d_inode(path->dentry);
627
628 generic_fillattr(inode, stat);
629 if (INODE_VERSION(inode) == MINIX_V1)
630 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
631 else
632 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
633 stat->blksize = sb->s_blocksize;
634 return 0;
635}
636
637/*
638 * The function that is called for file truncation.
639 */
640void minix_truncate(struct inode * inode)
641{
642 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
643 return;
644 if (INODE_VERSION(inode) == MINIX_V1)
645 V1_minix_truncate(inode);
646 else
647 V2_minix_truncate(inode);
648}
649
650static struct dentry *minix_mount(struct file_system_type *fs_type,
651 int flags, const char *dev_name, void *data)
652{
653 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
654}
655
656static struct file_system_type minix_fs_type = {
657 .owner = THIS_MODULE,
658 .name = "minix",
659 .mount = minix_mount,
660 .kill_sb = kill_block_super,
661 .fs_flags = FS_REQUIRES_DEV,
662};
663MODULE_ALIAS_FS("minix");
664
665static int __init init_minix_fs(void)
666{
667 int err = init_inodecache();
668 if (err)
669 goto out1;
670 err = register_filesystem(&minix_fs_type);
671 if (err)
672 goto out;
673 return 0;
674out:
675 destroy_inodecache();
676out1:
677 return err;
678}
679
680static void __exit exit_minix_fs(void)
681{
682 unregister_filesystem(&minix_fs_type);
683 destroy_inodecache();
684}
685
686module_init(init_minix_fs)
687module_exit(exit_minix_fs)
688MODULE_LICENSE("GPL");
689