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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
21static void minix_read_inode(struct inode * inode);
22static int minix_write_inode(struct inode * inode, int wait);
23static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
24static int minix_remount (struct super_block * sb, int * flags, char * data);
25
26static void minix_delete_inode(struct inode *inode)
27{
28 truncate_inode_pages(&inode->i_data, 0);
29 inode->i_size = 0;
30 minix_truncate(inode);
31 minix_free_inode(inode);
32}
33
34static void minix_put_super(struct super_block *sb)
35{
36 int i;
37 struct minix_sb_info *sbi = minix_sb(sb);
38
39 if (!(sb->s_flags & MS_RDONLY)) {
40 if (sbi->s_version != MINIX_V3)
41 sbi->s_ms->s_state = sbi->s_mount_state;
42 mark_buffer_dirty(sbi->s_sbh);
43 }
44 for (i = 0; i < sbi->s_imap_blocks; i++)
45 brelse(sbi->s_imap[i]);
46 for (i = 0; i < sbi->s_zmap_blocks; i++)
47 brelse(sbi->s_zmap[i]);
48 brelse (sbi->s_sbh);
49 kfree(sbi->s_imap);
50 sb->s_fs_info = NULL;
51 kfree(sbi);
52
53 return;
54}
55
56static struct kmem_cache * minix_inode_cachep;
57
58static struct inode *minix_alloc_inode(struct super_block *sb)
59{
60 struct minix_inode_info *ei;
61 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
62 if (!ei)
63 return NULL;
64 return &ei->vfs_inode;
65}
66
67static void minix_destroy_inode(struct inode *inode)
68{
69 kmem_cache_free(minix_inode_cachep, minix_i(inode));
70}
71
72static void init_once(struct kmem_cache * cachep, void *foo)
73{
74 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
75
76 inode_init_once(&ei->vfs_inode);
77}
78
79static int init_inodecache(void)
80{
81 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
82 sizeof(struct minix_inode_info),
83 0, (SLAB_RECLAIM_ACCOUNT|
84 SLAB_MEM_SPREAD),
85 init_once);
86 if (minix_inode_cachep == NULL)
87 return -ENOMEM;
88 return 0;
89}
90
91static void destroy_inodecache(void)
92{
93 kmem_cache_destroy(minix_inode_cachep);
94}
95
96static const struct super_operations minix_sops = {
97 .alloc_inode = minix_alloc_inode,
98 .destroy_inode = minix_destroy_inode,
99 .read_inode = minix_read_inode,
100 .write_inode = minix_write_inode,
101 .delete_inode = minix_delete_inode,
102 .put_super = minix_put_super,
103 .statfs = minix_statfs,
104 .remount_fs = minix_remount,
105};
106
107static int minix_remount (struct super_block * sb, int * flags, char * data)
108{
109 struct minix_sb_info * sbi = minix_sb(sb);
110 struct minix_super_block * ms;
111
112 ms = sbi->s_ms;
113 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
114 return 0;
115 if (*flags & MS_RDONLY) {
116 if (ms->s_state & MINIX_VALID_FS ||
117 !(sbi->s_mount_state & MINIX_VALID_FS))
118 return 0;
119
120 if (sbi->s_version != MINIX_V3)
121 ms->s_state = sbi->s_mount_state;
122 mark_buffer_dirty(sbi->s_sbh);
123 } else {
124
125 if (sbi->s_version != MINIX_V3) {
126 sbi->s_mount_state = ms->s_state;
127 ms->s_state &= ~MINIX_VALID_FS;
128 } else {
129 sbi->s_mount_state = MINIX_VALID_FS;
130 }
131 mark_buffer_dirty(sbi->s_sbh);
132
133 if (!(sbi->s_mount_state & MINIX_VALID_FS))
134 printk("MINIX-fs warning: remounting unchecked fs, "
135 "running fsck is recommended\n");
136 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
137 printk("MINIX-fs warning: remounting fs with errors, "
138 "running fsck is recommended\n");
139 }
140 return 0;
141}
142
143static int minix_fill_super(struct super_block *s, void *data, int silent)
144{
145 struct buffer_head *bh;
146 struct buffer_head **map;
147 struct minix_super_block *ms;
148 struct minix3_super_block *m3s = NULL;
149 unsigned long i, block;
150 struct inode *root_inode;
151 struct minix_sb_info *sbi;
152
153 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
154 if (!sbi)
155 return -ENOMEM;
156 s->s_fs_info = sbi;
157
158 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
159 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
160
161 if (!sb_set_blocksize(s, BLOCK_SIZE))
162 goto out_bad_hblock;
163
164 if (!(bh = sb_bread(s, 1)))
165 goto out_bad_sb;
166
167 ms = (struct minix_super_block *) bh->b_data;
168 sbi->s_ms = ms;
169 sbi->s_sbh = bh;
170 sbi->s_mount_state = ms->s_state;
171 sbi->s_ninodes = ms->s_ninodes;
172 sbi->s_nzones = ms->s_nzones;
173 sbi->s_imap_blocks = ms->s_imap_blocks;
174 sbi->s_zmap_blocks = ms->s_zmap_blocks;
175 sbi->s_firstdatazone = ms->s_firstdatazone;
176 sbi->s_log_zone_size = ms->s_log_zone_size;
177 sbi->s_max_size = ms->s_max_size;
178 s->s_magic = ms->s_magic;
179 if (s->s_magic == MINIX_SUPER_MAGIC) {
180 sbi->s_version = MINIX_V1;
181 sbi->s_dirsize = 16;
182 sbi->s_namelen = 14;
183 sbi->s_link_max = MINIX_LINK_MAX;
184 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
185 sbi->s_version = MINIX_V1;
186 sbi->s_dirsize = 32;
187 sbi->s_namelen = 30;
188 sbi->s_link_max = MINIX_LINK_MAX;
189 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
190 sbi->s_version = MINIX_V2;
191 sbi->s_nzones = ms->s_zones;
192 sbi->s_dirsize = 16;
193 sbi->s_namelen = 14;
194 sbi->s_link_max = MINIX2_LINK_MAX;
195 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V2;
197 sbi->s_nzones = ms->s_zones;
198 sbi->s_dirsize = 32;
199 sbi->s_namelen = 30;
200 sbi->s_link_max = MINIX2_LINK_MAX;
201 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
202 m3s = (struct minix3_super_block *) bh->b_data;
203 s->s_magic = m3s->s_magic;
204 sbi->s_imap_blocks = m3s->s_imap_blocks;
205 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
206 sbi->s_firstdatazone = m3s->s_firstdatazone;
207 sbi->s_log_zone_size = m3s->s_log_zone_size;
208 sbi->s_max_size = m3s->s_max_size;
209 sbi->s_ninodes = m3s->s_ninodes;
210 sbi->s_nzones = m3s->s_zones;
211 sbi->s_dirsize = 64;
212 sbi->s_namelen = 60;
213 sbi->s_version = MINIX_V3;
214 sbi->s_link_max = MINIX2_LINK_MAX;
215 sbi->s_mount_state = MINIX_VALID_FS;
216 sb_set_blocksize(s, m3s->s_blocksize);
217 } else
218 goto out_no_fs;
219
220
221
222
223 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
224 goto out_illegal_sb;
225 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
226 map = kzalloc(i, GFP_KERNEL);
227 if (!map)
228 goto out_no_map;
229 sbi->s_imap = &map[0];
230 sbi->s_zmap = &map[sbi->s_imap_blocks];
231
232 block=2;
233 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
234 if (!(sbi->s_imap[i]=sb_bread(s, block)))
235 goto out_no_bitmap;
236 block++;
237 }
238 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
239 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
240 goto out_no_bitmap;
241 block++;
242 }
243
244 minix_set_bit(0,sbi->s_imap[0]->b_data);
245 minix_set_bit(0,sbi->s_zmap[0]->b_data);
246
247
248 s->s_op = &minix_sops;
249 root_inode = iget(s, MINIX_ROOT_INO);
250 if (!root_inode || is_bad_inode(root_inode))
251 goto out_no_root;
252
253 s->s_root = d_alloc_root(root_inode);
254 if (!s->s_root)
255 goto out_iput;
256
257 if (!NO_TRUNCATE)
258 s->s_root->d_op = &minix_dentry_operations;
259
260 if (!(s->s_flags & MS_RDONLY)) {
261 if (sbi->s_version != MINIX_V3)
262 ms->s_state &= ~MINIX_VALID_FS;
263 mark_buffer_dirty(bh);
264 }
265 if (!(sbi->s_mount_state & MINIX_VALID_FS))
266 printk("MINIX-fs: mounting unchecked file system, "
267 "running fsck is recommended\n");
268 else if (sbi->s_mount_state & MINIX_ERROR_FS)
269 printk("MINIX-fs: mounting file system with errors, "
270 "running fsck is recommended\n");
271 return 0;
272
273out_iput:
274 iput(root_inode);
275 goto out_freemap;
276
277out_no_root:
278 if (!silent)
279 printk("MINIX-fs: get root inode failed\n");
280 goto out_freemap;
281
282out_no_bitmap:
283 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
284out_freemap:
285 for (i = 0; i < sbi->s_imap_blocks; i++)
286 brelse(sbi->s_imap[i]);
287 for (i = 0; i < sbi->s_zmap_blocks; i++)
288 brelse(sbi->s_zmap[i]);
289 kfree(sbi->s_imap);
290 goto out_release;
291
292out_no_map:
293 if (!silent)
294 printk("MINIX-fs: can't allocate map\n");
295 goto out_release;
296
297out_illegal_sb:
298 if (!silent)
299 printk("MINIX-fs: bad superblock\n");
300 goto out_release;
301
302out_no_fs:
303 if (!silent)
304 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
305 "on device %s.\n", s->s_id);
306out_release:
307 brelse(bh);
308 goto out;
309
310out_bad_hblock:
311 printk("MINIX-fs: blocksize too small for device\n");
312 goto out;
313
314out_bad_sb:
315 printk("MINIX-fs: unable to read superblock\n");
316out:
317 s->s_fs_info = NULL;
318 kfree(sbi);
319 return -EINVAL;
320}
321
322static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
323{
324 struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
325 buf->f_type = dentry->d_sb->s_magic;
326 buf->f_bsize = dentry->d_sb->s_blocksize;
327 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
328 buf->f_bfree = minix_count_free_blocks(sbi);
329 buf->f_bavail = buf->f_bfree;
330 buf->f_files = sbi->s_ninodes;
331 buf->f_ffree = minix_count_free_inodes(sbi);
332 buf->f_namelen = sbi->s_namelen;
333 return 0;
334}
335
336static int minix_get_block(struct inode *inode, sector_t block,
337 struct buffer_head *bh_result, int create)
338{
339 if (INODE_VERSION(inode) == MINIX_V1)
340 return V1_minix_get_block(inode, block, bh_result, create);
341 else
342 return V2_minix_get_block(inode, block, bh_result, create);
343}
344
345static int minix_writepage(struct page *page, struct writeback_control *wbc)
346{
347 return block_write_full_page(page, minix_get_block, wbc);
348}
349
350static int minix_readpage(struct file *file, struct page *page)
351{
352 return block_read_full_page(page,minix_get_block);
353}
354
355int __minix_write_begin(struct file *file, struct address_space *mapping,
356 loff_t pos, unsigned len, unsigned flags,
357 struct page **pagep, void **fsdata)
358{
359 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
360 minix_get_block);
361}
362
363static int minix_write_begin(struct file *file, struct address_space *mapping,
364 loff_t pos, unsigned len, unsigned flags,
365 struct page **pagep, void **fsdata)
366{
367 *pagep = NULL;
368 return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
369}
370
371static sector_t minix_bmap(struct address_space *mapping, sector_t block)
372{
373 return generic_block_bmap(mapping,block,minix_get_block);
374}
375
376static const struct address_space_operations minix_aops = {
377 .readpage = minix_readpage,
378 .writepage = minix_writepage,
379 .sync_page = block_sync_page,
380 .write_begin = minix_write_begin,
381 .write_end = generic_write_end,
382 .bmap = minix_bmap
383};
384
385static const struct inode_operations minix_symlink_inode_operations = {
386 .readlink = generic_readlink,
387 .follow_link = page_follow_link_light,
388 .put_link = page_put_link,
389 .getattr = minix_getattr,
390};
391
392void minix_set_inode(struct inode *inode, dev_t rdev)
393{
394 if (S_ISREG(inode->i_mode)) {
395 inode->i_op = &minix_file_inode_operations;
396 inode->i_fop = &minix_file_operations;
397 inode->i_mapping->a_ops = &minix_aops;
398 } else if (S_ISDIR(inode->i_mode)) {
399 inode->i_op = &minix_dir_inode_operations;
400 inode->i_fop = &minix_dir_operations;
401 inode->i_mapping->a_ops = &minix_aops;
402 } else if (S_ISLNK(inode->i_mode)) {
403 inode->i_op = &minix_symlink_inode_operations;
404 inode->i_mapping->a_ops = &minix_aops;
405 } else
406 init_special_inode(inode, inode->i_mode, rdev);
407}
408
409
410
411
412static void V1_minix_read_inode(struct inode * inode)
413{
414 struct buffer_head * bh;
415 struct minix_inode * raw_inode;
416 struct minix_inode_info *minix_inode = minix_i(inode);
417 int i;
418
419 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
420 if (!raw_inode) {
421 make_bad_inode(inode);
422 return;
423 }
424 inode->i_mode = raw_inode->i_mode;
425 inode->i_uid = (uid_t)raw_inode->i_uid;
426 inode->i_gid = (gid_t)raw_inode->i_gid;
427 inode->i_nlink = raw_inode->i_nlinks;
428 inode->i_size = raw_inode->i_size;
429 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
430 inode->i_mtime.tv_nsec = 0;
431 inode->i_atime.tv_nsec = 0;
432 inode->i_ctime.tv_nsec = 0;
433 inode->i_blocks = 0;
434 for (i = 0; i < 9; i++)
435 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
436 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
437 brelse(bh);
438}
439
440
441
442
443static void V2_minix_read_inode(struct inode * inode)
444{
445 struct buffer_head * bh;
446 struct minix2_inode * raw_inode;
447 struct minix_inode_info *minix_inode = minix_i(inode);
448 int i;
449
450 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
451 if (!raw_inode) {
452 make_bad_inode(inode);
453 return;
454 }
455 inode->i_mode = raw_inode->i_mode;
456 inode->i_uid = (uid_t)raw_inode->i_uid;
457 inode->i_gid = (gid_t)raw_inode->i_gid;
458 inode->i_nlink = raw_inode->i_nlinks;
459 inode->i_size = raw_inode->i_size;
460 inode->i_mtime.tv_sec = raw_inode->i_mtime;
461 inode->i_atime.tv_sec = raw_inode->i_atime;
462 inode->i_ctime.tv_sec = raw_inode->i_ctime;
463 inode->i_mtime.tv_nsec = 0;
464 inode->i_atime.tv_nsec = 0;
465 inode->i_ctime.tv_nsec = 0;
466 inode->i_blocks = 0;
467 for (i = 0; i < 10; i++)
468 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
469 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
470 brelse(bh);
471}
472
473
474
475
476static void minix_read_inode(struct inode * inode)
477{
478 if (INODE_VERSION(inode) == MINIX_V1)
479 V1_minix_read_inode(inode);
480 else
481 V2_minix_read_inode(inode);
482}
483
484
485
486
487static struct buffer_head * V1_minix_update_inode(struct inode * inode)
488{
489 struct buffer_head * bh;
490 struct minix_inode * raw_inode;
491 struct minix_inode_info *minix_inode = minix_i(inode);
492 int i;
493
494 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
495 if (!raw_inode)
496 return NULL;
497 raw_inode->i_mode = inode->i_mode;
498 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
499 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
500 raw_inode->i_nlinks = inode->i_nlink;
501 raw_inode->i_size = inode->i_size;
502 raw_inode->i_time = inode->i_mtime.tv_sec;
503 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
504 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
505 else for (i = 0; i < 9; i++)
506 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
507 mark_buffer_dirty(bh);
508 return bh;
509}
510
511
512
513
514static struct buffer_head * V2_minix_update_inode(struct inode * inode)
515{
516 struct buffer_head * bh;
517 struct minix2_inode * raw_inode;
518 struct minix_inode_info *minix_inode = minix_i(inode);
519 int i;
520
521 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
522 if (!raw_inode)
523 return NULL;
524 raw_inode->i_mode = inode->i_mode;
525 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
526 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
527 raw_inode->i_nlinks = inode->i_nlink;
528 raw_inode->i_size = inode->i_size;
529 raw_inode->i_mtime = inode->i_mtime.tv_sec;
530 raw_inode->i_atime = inode->i_atime.tv_sec;
531 raw_inode->i_ctime = inode->i_ctime.tv_sec;
532 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
533 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
534 else for (i = 0; i < 10; i++)
535 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
536 mark_buffer_dirty(bh);
537 return bh;
538}
539
540static struct buffer_head *minix_update_inode(struct inode *inode)
541{
542 if (INODE_VERSION(inode) == MINIX_V1)
543 return V1_minix_update_inode(inode);
544 else
545 return V2_minix_update_inode(inode);
546}
547
548static int minix_write_inode(struct inode * inode, int wait)
549{
550 brelse(minix_update_inode(inode));
551 return 0;
552}
553
554int minix_sync_inode(struct inode * inode)
555{
556 int err = 0;
557 struct buffer_head *bh;
558
559 bh = minix_update_inode(inode);
560 if (bh && buffer_dirty(bh))
561 {
562 sync_dirty_buffer(bh);
563 if (buffer_req(bh) && !buffer_uptodate(bh))
564 {
565 printk("IO error syncing minix inode [%s:%08lx]\n",
566 inode->i_sb->s_id, inode->i_ino);
567 err = -1;
568 }
569 }
570 else if (!bh)
571 err = -1;
572 brelse (bh);
573 return err;
574}
575
576int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
577{
578 struct inode *dir = dentry->d_parent->d_inode;
579 struct super_block *sb = dir->i_sb;
580 generic_fillattr(dentry->d_inode, stat);
581 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
582 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
583 else
584 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
585 stat->blksize = sb->s_blocksize;
586 return 0;
587}
588
589
590
591
592void minix_truncate(struct inode * inode)
593{
594 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
595 return;
596 if (INODE_VERSION(inode) == MINIX_V1)
597 V1_minix_truncate(inode);
598 else
599 V2_minix_truncate(inode);
600}
601
602static int minix_get_sb(struct file_system_type *fs_type,
603 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
604{
605 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
606 mnt);
607}
608
609static struct file_system_type minix_fs_type = {
610 .owner = THIS_MODULE,
611 .name = "minix",
612 .get_sb = minix_get_sb,
613 .kill_sb = kill_block_super,
614 .fs_flags = FS_REQUIRES_DEV,
615};
616
617static int __init init_minix_fs(void)
618{
619 int err = init_inodecache();
620 if (err)
621 goto out1;
622 err = register_filesystem(&minix_fs_type);
623 if (err)
624 goto out;
625 return 0;
626out:
627 destroy_inodecache();
628out1:
629 return err;
630}
631
632static void __exit exit_minix_fs(void)
633{
634 unregister_filesystem(&minix_fs_type);
635 destroy_inodecache();
636}
637
638module_init(init_minix_fs)
639module_exit(exit_minix_fs)
640MODULE_LICENSE("GPL");
641
642
