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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(&inode->i_data, 0);
30 if (!inode->i_nlink) {
31 inode->i_size = 0;
32 minix_truncate(inode);
33 }
34 invalidate_inode_buffers(inode);
35 end_writeback(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 INIT_LIST_HEAD(&inode->i_dentry);
75 kmem_cache_free(minix_inode_cachep, minix_i(inode));
76}
77
78static void minix_destroy_inode(struct inode *inode)
79{
80 call_rcu(&inode->i_rcu, minix_i_callback);
81}
82
83static void init_once(void *foo)
84{
85 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
86
87 inode_init_once(&ei->vfs_inode);
88}
89
90static int init_inodecache(void)
91{
92 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
93 sizeof(struct minix_inode_info),
94 0, (SLAB_RECLAIM_ACCOUNT|
95 SLAB_MEM_SPREAD),
96 init_once);
97 if (minix_inode_cachep == NULL)
98 return -ENOMEM;
99 return 0;
100}
101
102static void destroy_inodecache(void)
103{
104 kmem_cache_destroy(minix_inode_cachep);
105}
106
107static const struct super_operations minix_sops = {
108 .alloc_inode = minix_alloc_inode,
109 .destroy_inode = minix_destroy_inode,
110 .write_inode = minix_write_inode,
111 .evict_inode = minix_evict_inode,
112 .put_super = minix_put_super,
113 .statfs = minix_statfs,
114 .remount_fs = minix_remount,
115};
116
117static int minix_remount (struct super_block * sb, int * flags, char * data)
118{
119 struct minix_sb_info * sbi = minix_sb(sb);
120 struct minix_super_block * ms;
121
122 ms = sbi->s_ms;
123 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
124 return 0;
125 if (*flags & MS_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 sbi->s_link_max = 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 sbi->s_link_max = 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 sbi->s_link_max = 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 sbi->s_link_max = 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_link_max = MINIX2_LINK_MAX;
226 sbi->s_mount_state = MINIX_VALID_FS;
227 sb_set_blocksize(s, m3s->s_blocksize);
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 /* set up enough so that it can read an inode */
259 s->s_op = &minix_sops;
260 root_inode = minix_iget(s, MINIX_ROOT_INO);
261 if (IS_ERR(root_inode)) {
262 ret = PTR_ERR(root_inode);
263 goto out_no_root;
264 }
265
266 ret = -ENOMEM;
267 s->s_root = d_alloc_root(root_inode);
268 if (!s->s_root)
269 goto out_iput;
270
271 if (!(s->s_flags & MS_RDONLY)) {
272 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
273 ms->s_state &= ~MINIX_VALID_FS;
274 mark_buffer_dirty(bh);
275 }
276 if (!(sbi->s_mount_state & MINIX_VALID_FS))
277 printk("MINIX-fs: mounting unchecked file system, "
278 "running fsck is recommended\n");
279 else if (sbi->s_mount_state & MINIX_ERROR_FS)
280 printk("MINIX-fs: mounting file system with errors, "
281 "running fsck is recommended\n");
282 return 0;
283
284out_iput:
285 iput(root_inode);
286 goto out_freemap;
287
288out_no_root:
289 if (!silent)
290 printk("MINIX-fs: get root inode failed\n");
291 goto out_freemap;
292
293out_no_bitmap:
294 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
295out_freemap:
296 for (i = 0; i < sbi->s_imap_blocks; i++)
297 brelse(sbi->s_imap[i]);
298 for (i = 0; i < sbi->s_zmap_blocks; i++)
299 brelse(sbi->s_zmap[i]);
300 kfree(sbi->s_imap);
301 goto out_release;
302
303out_no_map:
304 ret = -ENOMEM;
305 if (!silent)
306 printk("MINIX-fs: can't allocate map\n");
307 goto out_release;
308
309out_illegal_sb:
310 if (!silent)
311 printk("MINIX-fs: bad superblock\n");
312 goto out_release;
313
314out_no_fs:
315 if (!silent)
316 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
317 "on device %s.\n", s->s_id);
318out_release:
319 brelse(bh);
320 goto out;
321
322out_bad_hblock:
323 printk("MINIX-fs: blocksize too small for device\n");
324 goto out;
325
326out_bad_sb:
327 printk("MINIX-fs: unable to read superblock\n");
328out:
329 s->s_fs_info = NULL;
330 kfree(sbi);
331 return ret;
332}
333
334static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
335{
336 struct super_block *sb = dentry->d_sb;
337 struct minix_sb_info *sbi = minix_sb(sb);
338 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
339 buf->f_type = sb->s_magic;
340 buf->f_bsize = sb->s_blocksize;
341 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
342 buf->f_bfree = minix_count_free_blocks(sbi);
343 buf->f_bavail = buf->f_bfree;
344 buf->f_files = sbi->s_ninodes;
345 buf->f_ffree = minix_count_free_inodes(sbi);
346 buf->f_namelen = sbi->s_namelen;
347 buf->f_fsid.val[0] = (u32)id;
348 buf->f_fsid.val[1] = (u32)(id >> 32);
349
350 return 0;
351}
352
353static int minix_get_block(struct inode *inode, sector_t block,
354 struct buffer_head *bh_result, int create)
355{
356 if (INODE_VERSION(inode) == MINIX_V1)
357 return V1_minix_get_block(inode, block, bh_result, create);
358 else
359 return V2_minix_get_block(inode, block, bh_result, create);
360}
361
362static int minix_writepage(struct page *page, struct writeback_control *wbc)
363{
364 return block_write_full_page(page, minix_get_block, wbc);
365}
366
367static int minix_readpage(struct file *file, struct page *page)
368{
369 return block_read_full_page(page,minix_get_block);
370}
371
372int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
373{
374 return __block_write_begin(page, pos, len, minix_get_block);
375}
376
377static int minix_write_begin(struct file *file, struct address_space *mapping,
378 loff_t pos, unsigned len, unsigned flags,
379 struct page **pagep, void **fsdata)
380{
381 int ret;
382
383 ret = block_write_begin(mapping, pos, len, flags, pagep,
384 minix_get_block);
385 if (unlikely(ret)) {
386 loff_t isize = mapping->host->i_size;
387 if (pos + len > isize)
388 vmtruncate(mapping->host, isize);
389 }
390
391 return ret;
392}
393
394static sector_t minix_bmap(struct address_space *mapping, sector_t block)
395{
396 return generic_block_bmap(mapping,block,minix_get_block);
397}
398
399static const struct address_space_operations minix_aops = {
400 .readpage = minix_readpage,
401 .writepage = minix_writepage,
402 .write_begin = minix_write_begin,
403 .write_end = generic_write_end,
404 .bmap = minix_bmap
405};
406
407static const struct inode_operations minix_symlink_inode_operations = {
408 .readlink = generic_readlink,
409 .follow_link = page_follow_link_light,
410 .put_link = page_put_link,
411 .getattr = minix_getattr,
412};
413
414void minix_set_inode(struct inode *inode, dev_t rdev)
415{
416 if (S_ISREG(inode->i_mode)) {
417 inode->i_op = &minix_file_inode_operations;
418 inode->i_fop = &minix_file_operations;
419 inode->i_mapping->a_ops = &minix_aops;
420 } else if (S_ISDIR(inode->i_mode)) {
421 inode->i_op = &minix_dir_inode_operations;
422 inode->i_fop = &minix_dir_operations;
423 inode->i_mapping->a_ops = &minix_aops;
424 } else if (S_ISLNK(inode->i_mode)) {
425 inode->i_op = &minix_symlink_inode_operations;
426 inode->i_mapping->a_ops = &minix_aops;
427 } else
428 init_special_inode(inode, inode->i_mode, rdev);
429}
430
431/*
432 * The minix V1 function to read an inode.
433 */
434static struct inode *V1_minix_iget(struct inode *inode)
435{
436 struct buffer_head * bh;
437 struct minix_inode * raw_inode;
438 struct minix_inode_info *minix_inode = minix_i(inode);
439 int i;
440
441 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
442 if (!raw_inode) {
443 iget_failed(inode);
444 return ERR_PTR(-EIO);
445 }
446 inode->i_mode = raw_inode->i_mode;
447 inode->i_uid = (uid_t)raw_inode->i_uid;
448 inode->i_gid = (gid_t)raw_inode->i_gid;
449 inode->i_nlink = raw_inode->i_nlinks;
450 inode->i_size = raw_inode->i_size;
451 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
452 inode->i_mtime.tv_nsec = 0;
453 inode->i_atime.tv_nsec = 0;
454 inode->i_ctime.tv_nsec = 0;
455 inode->i_blocks = 0;
456 for (i = 0; i < 9; i++)
457 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
458 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
459 brelse(bh);
460 unlock_new_inode(inode);
461 return inode;
462}
463
464/*
465 * The minix V2 function to read an inode.
466 */
467static struct inode *V2_minix_iget(struct inode *inode)
468{
469 struct buffer_head * bh;
470 struct minix2_inode * raw_inode;
471 struct minix_inode_info *minix_inode = minix_i(inode);
472 int i;
473
474 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
475 if (!raw_inode) {
476 iget_failed(inode);
477 return ERR_PTR(-EIO);
478 }
479 inode->i_mode = raw_inode->i_mode;
480 inode->i_uid = (uid_t)raw_inode->i_uid;
481 inode->i_gid = (gid_t)raw_inode->i_gid;
482 inode->i_nlink = raw_inode->i_nlinks;
483 inode->i_size = raw_inode->i_size;
484 inode->i_mtime.tv_sec = raw_inode->i_mtime;
485 inode->i_atime.tv_sec = raw_inode->i_atime;
486 inode->i_ctime.tv_sec = raw_inode->i_ctime;
487 inode->i_mtime.tv_nsec = 0;
488 inode->i_atime.tv_nsec = 0;
489 inode->i_ctime.tv_nsec = 0;
490 inode->i_blocks = 0;
491 for (i = 0; i < 10; i++)
492 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
493 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
494 brelse(bh);
495 unlock_new_inode(inode);
496 return inode;
497}
498
499/*
500 * The global function to read an inode.
501 */
502struct inode *minix_iget(struct super_block *sb, unsigned long ino)
503{
504 struct inode *inode;
505
506 inode = iget_locked(sb, ino);
507 if (!inode)
508 return ERR_PTR(-ENOMEM);
509 if (!(inode->i_state & I_NEW))
510 return inode;
511
512 if (INODE_VERSION(inode) == MINIX_V1)
513 return V1_minix_iget(inode);
514 else
515 return V2_minix_iget(inode);
516}
517
518/*
519 * The minix V1 function to synchronize an inode.
520 */
521static struct buffer_head * V1_minix_update_inode(struct inode * inode)
522{
523 struct buffer_head * bh;
524 struct minix_inode * raw_inode;
525 struct minix_inode_info *minix_inode = minix_i(inode);
526 int i;
527
528 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
529 if (!raw_inode)
530 return NULL;
531 raw_inode->i_mode = inode->i_mode;
532 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
533 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
534 raw_inode->i_nlinks = inode->i_nlink;
535 raw_inode->i_size = inode->i_size;
536 raw_inode->i_time = inode->i_mtime.tv_sec;
537 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
538 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
539 else for (i = 0; i < 9; i++)
540 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
541 mark_buffer_dirty(bh);
542 return bh;
543}
544
545/*
546 * The minix V2 function to synchronize an inode.
547 */
548static struct buffer_head * V2_minix_update_inode(struct inode * inode)
549{
550 struct buffer_head * bh;
551 struct minix2_inode * raw_inode;
552 struct minix_inode_info *minix_inode = minix_i(inode);
553 int i;
554
555 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
556 if (!raw_inode)
557 return NULL;
558 raw_inode->i_mode = inode->i_mode;
559 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
560 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
561 raw_inode->i_nlinks = inode->i_nlink;
562 raw_inode->i_size = inode->i_size;
563 raw_inode->i_mtime = inode->i_mtime.tv_sec;
564 raw_inode->i_atime = inode->i_atime.tv_sec;
565 raw_inode->i_ctime = inode->i_ctime.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 < 10; i++)
569 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
570 mark_buffer_dirty(bh);
571 return bh;
572}
573
574static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
575{
576 int err = 0;
577 struct buffer_head *bh;
578
579 if (INODE_VERSION(inode) == MINIX_V1)
580 bh = V1_minix_update_inode(inode);
581 else
582 bh = V2_minix_update_inode(inode);
583 if (!bh)
584 return -EIO;
585 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
586 sync_dirty_buffer(bh);
587 if (buffer_req(bh) && !buffer_uptodate(bh)) {
588 printk("IO error syncing minix inode [%s:%08lx]\n",
589 inode->i_sb->s_id, inode->i_ino);
590 err = -EIO;
591 }
592 }
593 brelse (bh);
594 return err;
595}
596
597int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
598{
599 struct super_block *sb = dentry->d_sb;
600 generic_fillattr(dentry->d_inode, stat);
601 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
602 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
603 else
604 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
605 stat->blksize = sb->s_blocksize;
606 return 0;
607}
608
609/*
610 * The function that is called for file truncation.
611 */
612void minix_truncate(struct inode * inode)
613{
614 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
615 return;
616 if (INODE_VERSION(inode) == MINIX_V1)
617 V1_minix_truncate(inode);
618 else
619 V2_minix_truncate(inode);
620}
621
622static struct dentry *minix_mount(struct file_system_type *fs_type,
623 int flags, const char *dev_name, void *data)
624{
625 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
626}
627
628static struct file_system_type minix_fs_type = {
629 .owner = THIS_MODULE,
630 .name = "minix",
631 .mount = minix_mount,
632 .kill_sb = kill_block_super,
633 .fs_flags = FS_REQUIRES_DEV,
634};
635
636static int __init init_minix_fs(void)
637{
638 int err = init_inodecache();
639 if (err)
640 goto out1;
641 err = register_filesystem(&minix_fs_type);
642 if (err)
643 goto out;
644 return 0;
645out:
646 destroy_inodecache();
647out1:
648 return err;
649}
650
651static void __exit exit_minix_fs(void)
652{
653 unregister_filesystem(&minix_fs_type);
654 destroy_inodecache();
655}
656
657module_init(init_minix_fs)
658module_exit(exit_minix_fs)
659MODULE_LICENSE("GPL");
660
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/mpage.h>
21#include <linux/vfs.h>
22#include <linux/writeback.h>
23#include <linux/fs_context.h>
24
25static int minix_write_inode(struct inode *inode,
26 struct writeback_control *wbc);
27static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
28
29static void minix_evict_inode(struct inode *inode)
30{
31 truncate_inode_pages_final(&inode->i_data);
32 if (!inode->i_nlink) {
33 inode->i_size = 0;
34 minix_truncate(inode);
35 }
36 invalidate_inode_buffers(inode);
37 clear_inode(inode);
38 if (!inode->i_nlink)
39 minix_free_inode(inode);
40}
41
42static void minix_put_super(struct super_block *sb)
43{
44 int i;
45 struct minix_sb_info *sbi = minix_sb(sb);
46
47 if (!sb_rdonly(sb)) {
48 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
49 sbi->s_ms->s_state = sbi->s_mount_state;
50 mark_buffer_dirty(sbi->s_sbh);
51 }
52 for (i = 0; i < sbi->s_imap_blocks; i++)
53 brelse(sbi->s_imap[i]);
54 for (i = 0; i < sbi->s_zmap_blocks; i++)
55 brelse(sbi->s_zmap[i]);
56 brelse (sbi->s_sbh);
57 kfree(sbi->s_imap);
58 sb->s_fs_info = NULL;
59 kfree(sbi);
60}
61
62static struct kmem_cache * minix_inode_cachep;
63
64static struct inode *minix_alloc_inode(struct super_block *sb)
65{
66 struct minix_inode_info *ei;
67 ei = alloc_inode_sb(sb, minix_inode_cachep, GFP_KERNEL);
68 if (!ei)
69 return NULL;
70 return &ei->vfs_inode;
71}
72
73static void minix_free_in_core_inode(struct inode *inode)
74{
75 kmem_cache_free(minix_inode_cachep, minix_i(inode));
76}
77
78static void init_once(void *foo)
79{
80 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
81
82 inode_init_once(&ei->vfs_inode);
83}
84
85static int __init init_inodecache(void)
86{
87 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
88 sizeof(struct minix_inode_info),
89 0, (SLAB_RECLAIM_ACCOUNT|
90 SLAB_ACCOUNT),
91 init_once);
92 if (minix_inode_cachep == NULL)
93 return -ENOMEM;
94 return 0;
95}
96
97static void destroy_inodecache(void)
98{
99 /*
100 * Make sure all delayed rcu free inodes are flushed before we
101 * destroy cache.
102 */
103 rcu_barrier();
104 kmem_cache_destroy(minix_inode_cachep);
105}
106
107static const struct super_operations minix_sops = {
108 .alloc_inode = minix_alloc_inode,
109 .free_inode = minix_free_in_core_inode,
110 .write_inode = minix_write_inode,
111 .evict_inode = minix_evict_inode,
112 .put_super = minix_put_super,
113 .statfs = minix_statfs,
114};
115
116static int minix_reconfigure(struct fs_context *fc)
117{
118 struct minix_super_block * ms;
119 struct super_block *sb = fc->root->d_sb;
120 struct minix_sb_info * sbi = sb->s_fs_info;
121
122 sync_filesystem(sb);
123 ms = sbi->s_ms;
124 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
125 return 0;
126 if (fc->sb_flags & SB_RDONLY) {
127 if (ms->s_state & MINIX_VALID_FS ||
128 !(sbi->s_mount_state & MINIX_VALID_FS))
129 return 0;
130 /* Mounting a rw partition read-only. */
131 if (sbi->s_version != MINIX_V3)
132 ms->s_state = sbi->s_mount_state;
133 mark_buffer_dirty(sbi->s_sbh);
134 } else {
135 /* Mount a partition which is read-only, read-write. */
136 if (sbi->s_version != MINIX_V3) {
137 sbi->s_mount_state = ms->s_state;
138 ms->s_state &= ~MINIX_VALID_FS;
139 } else {
140 sbi->s_mount_state = MINIX_VALID_FS;
141 }
142 mark_buffer_dirty(sbi->s_sbh);
143
144 if (!(sbi->s_mount_state & MINIX_VALID_FS))
145 printk("MINIX-fs warning: remounting unchecked fs, "
146 "running fsck is recommended\n");
147 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
148 printk("MINIX-fs warning: remounting fs with errors, "
149 "running fsck is recommended\n");
150 }
151 return 0;
152}
153
154static bool minix_check_superblock(struct super_block *sb)
155{
156 struct minix_sb_info *sbi = minix_sb(sb);
157
158 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
159 return false;
160
161 /*
162 * s_max_size must not exceed the block mapping limitation. This check
163 * is only needed for V1 filesystems, since V2/V3 support an extra level
164 * of indirect blocks which places the limit well above U32_MAX.
165 */
166 if (sbi->s_version == MINIX_V1 &&
167 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
168 return false;
169
170 return true;
171}
172
173static int minix_fill_super(struct super_block *s, struct fs_context *fc)
174{
175 struct buffer_head *bh;
176 struct buffer_head **map;
177 struct minix_super_block *ms;
178 struct minix3_super_block *m3s = NULL;
179 unsigned long i, block;
180 struct inode *root_inode;
181 struct minix_sb_info *sbi;
182 int ret = -EINVAL;
183 int silent = fc->sb_flags & SB_SILENT;
184
185 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
186 if (!sbi)
187 return -ENOMEM;
188 s->s_fs_info = sbi;
189
190 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
191 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
192
193 if (!sb_set_blocksize(s, BLOCK_SIZE))
194 goto out_bad_hblock;
195
196 if (!(bh = sb_bread(s, 1)))
197 goto out_bad_sb;
198
199 ms = (struct minix_super_block *) bh->b_data;
200 sbi->s_ms = ms;
201 sbi->s_sbh = bh;
202 sbi->s_mount_state = ms->s_state;
203 sbi->s_ninodes = ms->s_ninodes;
204 sbi->s_nzones = ms->s_nzones;
205 sbi->s_imap_blocks = ms->s_imap_blocks;
206 sbi->s_zmap_blocks = ms->s_zmap_blocks;
207 sbi->s_firstdatazone = ms->s_firstdatazone;
208 sbi->s_log_zone_size = ms->s_log_zone_size;
209 s->s_maxbytes = ms->s_max_size;
210 s->s_magic = ms->s_magic;
211 if (s->s_magic == MINIX_SUPER_MAGIC) {
212 sbi->s_version = MINIX_V1;
213 sbi->s_dirsize = 16;
214 sbi->s_namelen = 14;
215 s->s_max_links = MINIX_LINK_MAX;
216 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
217 sbi->s_version = MINIX_V1;
218 sbi->s_dirsize = 32;
219 sbi->s_namelen = 30;
220 s->s_max_links = MINIX_LINK_MAX;
221 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
222 sbi->s_version = MINIX_V2;
223 sbi->s_nzones = ms->s_zones;
224 sbi->s_dirsize = 16;
225 sbi->s_namelen = 14;
226 s->s_max_links = MINIX2_LINK_MAX;
227 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
228 sbi->s_version = MINIX_V2;
229 sbi->s_nzones = ms->s_zones;
230 sbi->s_dirsize = 32;
231 sbi->s_namelen = 30;
232 s->s_max_links = MINIX2_LINK_MAX;
233 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
234 m3s = (struct minix3_super_block *) bh->b_data;
235 s->s_magic = m3s->s_magic;
236 sbi->s_imap_blocks = m3s->s_imap_blocks;
237 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
238 sbi->s_firstdatazone = m3s->s_firstdatazone;
239 sbi->s_log_zone_size = m3s->s_log_zone_size;
240 s->s_maxbytes = m3s->s_max_size;
241 sbi->s_ninodes = m3s->s_ninodes;
242 sbi->s_nzones = m3s->s_zones;
243 sbi->s_dirsize = 64;
244 sbi->s_namelen = 60;
245 sbi->s_version = MINIX_V3;
246 sbi->s_mount_state = MINIX_VALID_FS;
247 sb_set_blocksize(s, m3s->s_blocksize);
248 s->s_max_links = MINIX2_LINK_MAX;
249 } else
250 goto out_no_fs;
251
252 if (!minix_check_superblock(s))
253 goto out_illegal_sb;
254
255 /*
256 * Allocate the buffer map to keep the superblock small.
257 */
258 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
259 map = kzalloc(i, GFP_KERNEL);
260 if (!map)
261 goto out_no_map;
262 sbi->s_imap = &map[0];
263 sbi->s_zmap = &map[sbi->s_imap_blocks];
264
265 block=2;
266 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
267 if (!(sbi->s_imap[i]=sb_bread(s, block)))
268 goto out_no_bitmap;
269 block++;
270 }
271 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
272 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
273 goto out_no_bitmap;
274 block++;
275 }
276
277 minix_set_bit(0,sbi->s_imap[0]->b_data);
278 minix_set_bit(0,sbi->s_zmap[0]->b_data);
279
280 /* Apparently minix can create filesystems that allocate more blocks for
281 * the bitmaps than needed. We simply ignore that, but verify it didn't
282 * create one with not enough blocks and bail out if so.
283 */
284 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
285 if (sbi->s_imap_blocks < block) {
286 printk("MINIX-fs: file system does not have enough "
287 "imap blocks allocated. Refusing to mount.\n");
288 goto out_no_bitmap;
289 }
290
291 block = minix_blocks_needed(
292 (sbi->s_nzones - sbi->s_firstdatazone + 1),
293 s->s_blocksize);
294 if (sbi->s_zmap_blocks < block) {
295 printk("MINIX-fs: file system does not have enough "
296 "zmap blocks allocated. Refusing to mount.\n");
297 goto out_no_bitmap;
298 }
299
300 /* set up enough so that it can read an inode */
301 s->s_op = &minix_sops;
302 s->s_time_min = 0;
303 s->s_time_max = U32_MAX;
304 root_inode = minix_iget(s, MINIX_ROOT_INO);
305 if (IS_ERR(root_inode)) {
306 ret = PTR_ERR(root_inode);
307 goto out_no_root;
308 }
309
310 ret = -ENOMEM;
311 s->s_root = d_make_root(root_inode);
312 if (!s->s_root)
313 goto out_no_root;
314
315 if (!sb_rdonly(s)) {
316 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
317 ms->s_state &= ~MINIX_VALID_FS;
318 mark_buffer_dirty(bh);
319 }
320 if (!(sbi->s_mount_state & MINIX_VALID_FS))
321 printk("MINIX-fs: mounting unchecked file system, "
322 "running fsck is recommended\n");
323 else if (sbi->s_mount_state & MINIX_ERROR_FS)
324 printk("MINIX-fs: mounting file system with errors, "
325 "running fsck is recommended\n");
326
327 return 0;
328
329out_no_root:
330 if (!silent)
331 printk("MINIX-fs: get root inode failed\n");
332 goto out_freemap;
333
334out_no_bitmap:
335 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
336out_freemap:
337 for (i = 0; i < sbi->s_imap_blocks; i++)
338 brelse(sbi->s_imap[i]);
339 for (i = 0; i < sbi->s_zmap_blocks; i++)
340 brelse(sbi->s_zmap[i]);
341 kfree(sbi->s_imap);
342 goto out_release;
343
344out_no_map:
345 ret = -ENOMEM;
346 if (!silent)
347 printk("MINIX-fs: can't allocate map\n");
348 goto out_release;
349
350out_illegal_sb:
351 if (!silent)
352 printk("MINIX-fs: bad superblock\n");
353 goto out_release;
354
355out_no_fs:
356 if (!silent)
357 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
358 "on device %s.\n", s->s_id);
359out_release:
360 brelse(bh);
361 goto out;
362
363out_bad_hblock:
364 printk("MINIX-fs: blocksize too small for device\n");
365 goto out;
366
367out_bad_sb:
368 printk("MINIX-fs: unable to read superblock\n");
369out:
370 s->s_fs_info = NULL;
371 kfree(sbi);
372 return ret;
373}
374
375static int minix_get_tree(struct fs_context *fc)
376{
377 return get_tree_bdev(fc, minix_fill_super);
378}
379
380static const struct fs_context_operations minix_context_ops = {
381 .get_tree = minix_get_tree,
382 .reconfigure = minix_reconfigure,
383};
384
385static int minix_init_fs_context(struct fs_context *fc)
386{
387 fc->ops = &minix_context_ops;
388
389 return 0;
390}
391
392static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
393{
394 struct super_block *sb = dentry->d_sb;
395 struct minix_sb_info *sbi = minix_sb(sb);
396 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
397 buf->f_type = sb->s_magic;
398 buf->f_bsize = sb->s_blocksize;
399 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
400 buf->f_bfree = minix_count_free_blocks(sb);
401 buf->f_bavail = buf->f_bfree;
402 buf->f_files = sbi->s_ninodes;
403 buf->f_ffree = minix_count_free_inodes(sb);
404 buf->f_namelen = sbi->s_namelen;
405 buf->f_fsid = u64_to_fsid(id);
406
407 return 0;
408}
409
410static int minix_get_block(struct inode *inode, sector_t block,
411 struct buffer_head *bh_result, int create)
412{
413 if (INODE_VERSION(inode) == MINIX_V1)
414 return V1_minix_get_block(inode, block, bh_result, create);
415 else
416 return V2_minix_get_block(inode, block, bh_result, create);
417}
418
419static int minix_writepages(struct address_space *mapping,
420 struct writeback_control *wbc)
421{
422 return mpage_writepages(mapping, wbc, minix_get_block);
423}
424
425static int minix_read_folio(struct file *file, struct folio *folio)
426{
427 return block_read_full_folio(folio, minix_get_block);
428}
429
430int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)
431{
432 return __block_write_begin(folio, pos, len, minix_get_block);
433}
434
435static void minix_write_failed(struct address_space *mapping, loff_t to)
436{
437 struct inode *inode = mapping->host;
438
439 if (to > inode->i_size) {
440 truncate_pagecache(inode, inode->i_size);
441 minix_truncate(inode);
442 }
443}
444
445static int minix_write_begin(struct file *file, struct address_space *mapping,
446 loff_t pos, unsigned len,
447 struct folio **foliop, void **fsdata)
448{
449 int ret;
450
451 ret = block_write_begin(mapping, pos, len, foliop, minix_get_block);
452 if (unlikely(ret))
453 minix_write_failed(mapping, pos + len);
454
455 return ret;
456}
457
458static sector_t minix_bmap(struct address_space *mapping, sector_t block)
459{
460 return generic_block_bmap(mapping,block,minix_get_block);
461}
462
463static const struct address_space_operations minix_aops = {
464 .dirty_folio = block_dirty_folio,
465 .invalidate_folio = block_invalidate_folio,
466 .read_folio = minix_read_folio,
467 .writepages = minix_writepages,
468 .write_begin = minix_write_begin,
469 .write_end = generic_write_end,
470 .migrate_folio = buffer_migrate_folio,
471 .bmap = minix_bmap,
472 .direct_IO = noop_direct_IO
473};
474
475static const struct inode_operations minix_symlink_inode_operations = {
476 .get_link = page_get_link,
477 .getattr = minix_getattr,
478};
479
480void minix_set_inode(struct inode *inode, dev_t rdev)
481{
482 if (S_ISREG(inode->i_mode)) {
483 inode->i_op = &minix_file_inode_operations;
484 inode->i_fop = &minix_file_operations;
485 inode->i_mapping->a_ops = &minix_aops;
486 } else if (S_ISDIR(inode->i_mode)) {
487 inode->i_op = &minix_dir_inode_operations;
488 inode->i_fop = &minix_dir_operations;
489 inode->i_mapping->a_ops = &minix_aops;
490 } else if (S_ISLNK(inode->i_mode)) {
491 inode->i_op = &minix_symlink_inode_operations;
492 inode_nohighmem(inode);
493 inode->i_mapping->a_ops = &minix_aops;
494 } else
495 init_special_inode(inode, inode->i_mode, rdev);
496}
497
498/*
499 * The minix V1 function to read an inode.
500 */
501static struct inode *V1_minix_iget(struct inode *inode)
502{
503 struct buffer_head * bh;
504 struct minix_inode * raw_inode;
505 struct minix_inode_info *minix_inode = minix_i(inode);
506 int i;
507
508 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
509 if (!raw_inode) {
510 iget_failed(inode);
511 return ERR_PTR(-EIO);
512 }
513 if (raw_inode->i_nlinks == 0) {
514 printk("MINIX-fs: deleted inode referenced: %lu\n",
515 inode->i_ino);
516 brelse(bh);
517 iget_failed(inode);
518 return ERR_PTR(-ESTALE);
519 }
520 inode->i_mode = raw_inode->i_mode;
521 i_uid_write(inode, raw_inode->i_uid);
522 i_gid_write(inode, raw_inode->i_gid);
523 set_nlink(inode, raw_inode->i_nlinks);
524 inode->i_size = raw_inode->i_size;
525 inode_set_mtime_to_ts(inode,
526 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0)));
527 inode->i_blocks = 0;
528 for (i = 0; i < 9; i++)
529 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
530 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
531 brelse(bh);
532 unlock_new_inode(inode);
533 return inode;
534}
535
536/*
537 * The minix V2 function to read an inode.
538 */
539static struct inode *V2_minix_iget(struct inode *inode)
540{
541 struct buffer_head * bh;
542 struct minix2_inode * raw_inode;
543 struct minix_inode_info *minix_inode = minix_i(inode);
544 int i;
545
546 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
547 if (!raw_inode) {
548 iget_failed(inode);
549 return ERR_PTR(-EIO);
550 }
551 if (raw_inode->i_nlinks == 0) {
552 printk("MINIX-fs: deleted inode referenced: %lu\n",
553 inode->i_ino);
554 brelse(bh);
555 iget_failed(inode);
556 return ERR_PTR(-ESTALE);
557 }
558 inode->i_mode = raw_inode->i_mode;
559 i_uid_write(inode, raw_inode->i_uid);
560 i_gid_write(inode, raw_inode->i_gid);
561 set_nlink(inode, raw_inode->i_nlinks);
562 inode->i_size = raw_inode->i_size;
563 inode_set_mtime(inode, raw_inode->i_mtime, 0);
564 inode_set_atime(inode, raw_inode->i_atime, 0);
565 inode_set_ctime(inode, raw_inode->i_ctime, 0);
566 inode->i_blocks = 0;
567 for (i = 0; i < 10; i++)
568 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
569 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
570 brelse(bh);
571 unlock_new_inode(inode);
572 return inode;
573}
574
575/*
576 * The global function to read an inode.
577 */
578struct inode *minix_iget(struct super_block *sb, unsigned long ino)
579{
580 struct inode *inode;
581
582 inode = iget_locked(sb, ino);
583 if (!inode)
584 return ERR_PTR(-ENOMEM);
585 if (!(inode->i_state & I_NEW))
586 return inode;
587
588 if (INODE_VERSION(inode) == MINIX_V1)
589 return V1_minix_iget(inode);
590 else
591 return V2_minix_iget(inode);
592}
593
594/*
595 * The minix V1 function to synchronize an inode.
596 */
597static struct buffer_head * V1_minix_update_inode(struct inode * inode)
598{
599 struct buffer_head * bh;
600 struct minix_inode * raw_inode;
601 struct minix_inode_info *minix_inode = minix_i(inode);
602 int i;
603
604 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
605 if (!raw_inode)
606 return NULL;
607 raw_inode->i_mode = inode->i_mode;
608 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
609 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
610 raw_inode->i_nlinks = inode->i_nlink;
611 raw_inode->i_size = inode->i_size;
612 raw_inode->i_time = inode_get_mtime_sec(inode);
613 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
614 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
615 else for (i = 0; i < 9; i++)
616 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
617 mark_buffer_dirty(bh);
618 return bh;
619}
620
621/*
622 * The minix V2 function to synchronize an inode.
623 */
624static struct buffer_head * V2_minix_update_inode(struct inode * inode)
625{
626 struct buffer_head * bh;
627 struct minix2_inode * raw_inode;
628 struct minix_inode_info *minix_inode = minix_i(inode);
629 int i;
630
631 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
632 if (!raw_inode)
633 return NULL;
634 raw_inode->i_mode = inode->i_mode;
635 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
636 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
637 raw_inode->i_nlinks = inode->i_nlink;
638 raw_inode->i_size = inode->i_size;
639 raw_inode->i_mtime = inode_get_mtime_sec(inode);
640 raw_inode->i_atime = inode_get_atime_sec(inode);
641 raw_inode->i_ctime = inode_get_ctime_sec(inode);
642 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
643 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
644 else for (i = 0; i < 10; i++)
645 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
646 mark_buffer_dirty(bh);
647 return bh;
648}
649
650static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
651{
652 int err = 0;
653 struct buffer_head *bh;
654
655 if (INODE_VERSION(inode) == MINIX_V1)
656 bh = V1_minix_update_inode(inode);
657 else
658 bh = V2_minix_update_inode(inode);
659 if (!bh)
660 return -EIO;
661 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
662 sync_dirty_buffer(bh);
663 if (buffer_req(bh) && !buffer_uptodate(bh)) {
664 printk("IO error syncing minix inode [%s:%08lx]\n",
665 inode->i_sb->s_id, inode->i_ino);
666 err = -EIO;
667 }
668 }
669 brelse (bh);
670 return err;
671}
672
673int minix_getattr(struct mnt_idmap *idmap, const struct path *path,
674 struct kstat *stat, u32 request_mask, unsigned int flags)
675{
676 struct super_block *sb = path->dentry->d_sb;
677 struct inode *inode = d_inode(path->dentry);
678
679 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
680 if (INODE_VERSION(inode) == MINIX_V1)
681 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
682 else
683 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
684 stat->blksize = sb->s_blocksize;
685 return 0;
686}
687
688/*
689 * The function that is called for file truncation.
690 */
691void minix_truncate(struct inode * inode)
692{
693 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
694 return;
695 if (INODE_VERSION(inode) == MINIX_V1)
696 V1_minix_truncate(inode);
697 else
698 V2_minix_truncate(inode);
699}
700
701static struct file_system_type minix_fs_type = {
702 .owner = THIS_MODULE,
703 .name = "minix",
704 .kill_sb = kill_block_super,
705 .fs_flags = FS_REQUIRES_DEV,
706 .init_fs_context = minix_init_fs_context,
707};
708MODULE_ALIAS_FS("minix");
709
710static int __init init_minix_fs(void)
711{
712 int err = init_inodecache();
713 if (err)
714 goto out1;
715 err = register_filesystem(&minix_fs_type);
716 if (err)
717 goto out;
718 return 0;
719out:
720 destroy_inodecache();
721out1:
722 return err;
723}
724
725static void __exit exit_minix_fs(void)
726{
727 unregister_filesystem(&minix_fs_type);
728 destroy_inodecache();
729}
730
731module_init(init_minix_fs)
732module_exit(exit_minix_fs)
733MODULE_DESCRIPTION("Minix file system");
734MODULE_LICENSE("GPL");
735