2 * linux/fs/minix/inode.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
9 * Modified for 680x0 by Andreas Schwab
12 #include <linux/module.h>
15 #include <linux/minix_fs.h>
16 #include <linux/slab.h>
17 #include <linux/locks.h>
18 #include <linux/init.h>
19 #include <linux/smp_lock.h>
20 #include <linux/highuid.h>
21 #include <linux/blkdev.h>
23 static void minix_read_inode(struct inode * inode);
24 static void minix_write_inode(struct inode * inode, int wait);
25 static int minix_statfs(struct super_block *sb, struct statfs *buf);
26 static int minix_remount (struct super_block * sb, int * flags, char * data);
28 static void minix_delete_inode(struct inode *inode)
33 minix_truncate(inode);
34 minix_free_inode(inode);
39 static void minix_commit_super(struct super_block * sb)
41 mark_buffer_dirty(sb->u.minix_sb.s_sbh);
45 static void minix_write_super(struct super_block * sb)
47 struct minix_super_block * ms;
49 if (!(sb->s_flags & MS_RDONLY)) {
50 ms = sb->u.minix_sb.s_ms;
52 if (ms->s_state & MINIX_VALID_FS)
53 ms->s_state &= ~MINIX_VALID_FS;
54 minix_commit_super(sb);
60 static void minix_put_super(struct super_block *sb)
64 if (!(sb->s_flags & MS_RDONLY)) {
65 sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
66 mark_buffer_dirty(sb->u.minix_sb.s_sbh);
68 for (i = 0; i < sb->u.minix_sb.s_imap_blocks; i++)
69 brelse(sb->u.minix_sb.s_imap[i]);
70 for (i = 0; i < sb->u.minix_sb.s_zmap_blocks; i++)
71 brelse(sb->u.minix_sb.s_zmap[i]);
72 brelse (sb->u.minix_sb.s_sbh);
73 kfree(sb->u.minix_sb.s_imap);
78 static struct super_operations minix_sops = {
79 read_inode: minix_read_inode,
80 write_inode: minix_write_inode,
81 delete_inode: minix_delete_inode,
82 put_super: minix_put_super,
83 write_super: minix_write_super,
85 remount_fs: minix_remount,
88 static int minix_remount (struct super_block * sb, int * flags, char * data)
90 struct minix_super_block * ms;
92 ms = sb->u.minix_sb.s_ms;
93 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
95 if (*flags & MS_RDONLY) {
96 if (ms->s_state & MINIX_VALID_FS ||
97 !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
99 /* Mounting a rw partition read-only. */
100 ms->s_state = sb->u.minix_sb.s_mount_state;
101 mark_buffer_dirty(sb->u.minix_sb.s_sbh);
103 minix_commit_super(sb);
106 /* Mount a partition which is read-only, read-write. */
107 sb->u.minix_sb.s_mount_state = ms->s_state;
108 ms->s_state &= ~MINIX_VALID_FS;
109 mark_buffer_dirty(sb->u.minix_sb.s_sbh);
112 if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
113 printk ("MINIX-fs warning: remounting unchecked fs, "
114 "running fsck is recommended.\n");
115 else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
116 printk ("MINIX-fs warning: remounting fs with errors, "
117 "running fsck is recommended.\n");
122 static struct super_block *minix_read_super(struct super_block *s, void *data,
125 struct buffer_head *bh;
126 struct buffer_head **map;
127 struct minix_super_block *ms;
129 kdev_t dev = s->s_dev;
130 struct inode *root_inode;
132 struct minix_sb_info *sbi = &s->u.minix_sb;
134 /* N.B. These should be compile-time tests.
135 Unfortunately that is impossible. */
136 if (32 != sizeof (struct minix_inode))
137 panic("bad V1 i-node size");
138 if (64 != sizeof(struct minix2_inode))
139 panic("bad V2 i-node size");
141 hblock = get_hardsect_size(dev);
142 if (hblock > BLOCK_SIZE)
145 set_blocksize(dev, BLOCK_SIZE);
146 s->s_blocksize = BLOCK_SIZE;
147 s->s_blocksize_bits = BLOCK_SIZE_BITS;
148 if (!(bh = sb_bread(s, 1)))
151 ms = (struct minix_super_block *) bh->b_data;
154 sbi->s_mount_state = ms->s_state;
155 sbi->s_ninodes = ms->s_ninodes;
156 sbi->s_nzones = ms->s_nzones;
157 sbi->s_imap_blocks = ms->s_imap_blocks;
158 sbi->s_zmap_blocks = ms->s_zmap_blocks;
159 sbi->s_firstdatazone = ms->s_firstdatazone;
160 sbi->s_log_zone_size = ms->s_log_zone_size;
161 sbi->s_max_size = ms->s_max_size;
162 s->s_magic = ms->s_magic;
163 if (s->s_magic == MINIX_SUPER_MAGIC) {
164 sbi->s_version = MINIX_V1;
167 sbi->s_link_max = MINIX_LINK_MAX;
168 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
169 sbi->s_version = MINIX_V1;
172 sbi->s_link_max = MINIX_LINK_MAX;
173 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
174 sbi->s_version = MINIX_V2;
175 sbi->s_nzones = ms->s_zones;
178 sbi->s_link_max = MINIX2_LINK_MAX;
179 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
180 sbi->s_version = MINIX_V2;
181 sbi->s_nzones = ms->s_zones;
184 sbi->s_link_max = MINIX2_LINK_MAX;
189 * Allocate the buffer map to keep the superblock small.
191 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
192 map = kmalloc(i, GFP_KERNEL);
196 sbi->s_imap = &map[0];
197 sbi->s_zmap = &map[sbi->s_imap_blocks];
200 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
201 if (!(sbi->s_imap[i]=sb_bread(s, block)))
205 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
206 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
211 minix_set_bit(0,sbi->s_imap[0]->b_data);
212 minix_set_bit(0,sbi->s_zmap[0]->b_data);
214 /* set up enough so that it can read an inode */
215 s->s_op = &minix_sops;
216 root_inode = iget(s, MINIX_ROOT_INO);
217 if (!root_inode || is_bad_inode(root_inode))
220 s->s_root = d_alloc_root(root_inode);
225 s->s_root->d_op = &minix_dentry_operations;
227 if (!(s->s_flags & MS_RDONLY)) {
228 ms->s_state &= ~MINIX_VALID_FS;
229 mark_buffer_dirty(bh);
232 if (!(sbi->s_mount_state & MINIX_VALID_FS))
233 printk ("MINIX-fs: mounting unchecked file system, "
234 "running fsck is recommended.\n");
235 else if (sbi->s_mount_state & MINIX_ERROR_FS)
236 printk ("MINIX-fs: mounting file system with errors, "
237 "running fsck is recommended.\n");
246 printk("MINIX-fs: get root inode failed\n");
250 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
252 for (i = 0; i < sbi->s_imap_blocks; i++)
253 brelse(sbi->s_imap[i]);
254 for (i = 0; i < sbi->s_zmap_blocks; i++)
255 brelse(sbi->s_zmap[i]);
261 printk ("MINIX-fs: can't allocate map\n");
266 printk("VFS: Can't find a Minix or Minix V2 filesystem on device "
267 "%s.\n", kdevname(dev));
273 printk("MINIX-fs: blocksize too small for device.\n");
277 printk("MINIX-fs: unable to read superblock\n");
282 static int minix_statfs(struct super_block *sb, struct statfs *buf)
284 buf->f_type = sb->s_magic;
285 buf->f_bsize = sb->s_blocksize;
286 buf->f_blocks = (sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone) << sb->u.minix_sb.s_log_zone_size;
287 buf->f_bfree = minix_count_free_blocks(sb);
288 buf->f_bavail = buf->f_bfree;
289 buf->f_files = sb->u.minix_sb.s_ninodes;
290 buf->f_ffree = minix_count_free_inodes(sb);
291 buf->f_namelen = sb->u.minix_sb.s_namelen;
295 static int minix_get_block(struct inode *inode, long block,
296 struct buffer_head *bh_result, int create)
298 if (INODE_VERSION(inode) == MINIX_V1)
299 return V1_minix_get_block(inode, block, bh_result, create);
301 return V2_minix_get_block(inode, block, bh_result, create);
304 static int minix_writepage(struct page *page)
306 return block_write_full_page(page,minix_get_block);
308 static int minix_readpage(struct file *file, struct page *page)
310 return block_read_full_page(page,minix_get_block);
312 static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
314 return block_prepare_write(page,from,to,minix_get_block);
316 static int minix_bmap(struct address_space *mapping, long block)
318 return generic_block_bmap(mapping,block,minix_get_block);
320 static struct address_space_operations minix_aops = {
321 readpage: minix_readpage,
322 writepage: minix_writepage,
323 sync_page: block_sync_page,
324 prepare_write: minix_prepare_write,
325 commit_write: generic_commit_write,
329 void minix_set_inode(struct inode *inode, dev_t rdev)
331 if (S_ISREG(inode->i_mode)) {
332 inode->i_op = &minix_file_inode_operations;
333 inode->i_fop = &minix_file_operations;
334 inode->i_mapping->a_ops = &minix_aops;
335 } else if (S_ISDIR(inode->i_mode)) {
336 inode->i_op = &minix_dir_inode_operations;
337 inode->i_fop = &minix_dir_operations;
338 inode->i_mapping->a_ops = &minix_aops;
339 } else if (S_ISLNK(inode->i_mode)) {
340 inode->i_op = &page_symlink_inode_operations;
341 inode->i_mapping->a_ops = &minix_aops;
343 init_special_inode(inode, inode->i_mode, rdev);
347 * The minix V1 function to read an inode.
349 static void V1_minix_read_inode(struct inode * inode)
351 struct buffer_head * bh;
352 struct minix_inode * raw_inode;
355 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
357 make_bad_inode(inode);
360 inode->i_mode = raw_inode->i_mode;
361 inode->i_uid = (uid_t)raw_inode->i_uid;
362 inode->i_gid = (gid_t)raw_inode->i_gid;
363 inode->i_nlink = raw_inode->i_nlinks;
364 inode->i_size = raw_inode->i_size;
365 inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
366 inode->i_blocks = inode->i_blksize = 0;
367 for (i = 0; i < 9; i++)
368 inode->u.minix_i.u.i1_data[i] = raw_inode->i_zone[i];
369 minix_set_inode(inode, raw_inode->i_zone[0]);
374 * The minix V2 function to read an inode.
376 static void V2_minix_read_inode(struct inode * inode)
378 struct buffer_head * bh;
379 struct minix2_inode * raw_inode;
382 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
384 make_bad_inode(inode);
387 inode->i_mode = raw_inode->i_mode;
388 inode->i_uid = (uid_t)raw_inode->i_uid;
389 inode->i_gid = (gid_t)raw_inode->i_gid;
390 inode->i_nlink = raw_inode->i_nlinks;
391 inode->i_size = raw_inode->i_size;
392 inode->i_mtime = raw_inode->i_mtime;
393 inode->i_atime = raw_inode->i_atime;
394 inode->i_ctime = raw_inode->i_ctime;
395 inode->i_blocks = inode->i_blksize = 0;
396 for (i = 0; i < 10; i++)
397 inode->u.minix_i.u.i2_data[i] = raw_inode->i_zone[i];
398 minix_set_inode(inode, raw_inode->i_zone[0]);
403 * The global function to read an inode.
405 static void minix_read_inode(struct inode * inode)
407 if (INODE_VERSION(inode) == MINIX_V1)
408 V1_minix_read_inode(inode);
410 V2_minix_read_inode(inode);
414 * The minix V1 function to synchronize an inode.
416 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
418 struct buffer_head * bh;
419 struct minix_inode * raw_inode;
422 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
425 raw_inode->i_mode = inode->i_mode;
426 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
427 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
428 raw_inode->i_nlinks = inode->i_nlink;
429 raw_inode->i_size = inode->i_size;
430 raw_inode->i_time = inode->i_mtime;
431 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
432 raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
433 else for (i = 0; i < 9; i++)
434 raw_inode->i_zone[i] = inode->u.minix_i.u.i1_data[i];
435 mark_buffer_dirty(bh);
440 * The minix V2 function to synchronize an inode.
442 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
444 struct buffer_head * bh;
445 struct minix2_inode * raw_inode;
448 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
451 raw_inode->i_mode = inode->i_mode;
452 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
453 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
454 raw_inode->i_nlinks = inode->i_nlink;
455 raw_inode->i_size = inode->i_size;
456 raw_inode->i_mtime = inode->i_mtime;
457 raw_inode->i_atime = inode->i_atime;
458 raw_inode->i_ctime = inode->i_ctime;
459 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
460 raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
461 else for (i = 0; i < 10; i++)
462 raw_inode->i_zone[i] = inode->u.minix_i.u.i2_data[i];
463 mark_buffer_dirty(bh);
467 static struct buffer_head *minix_update_inode(struct inode *inode)
469 if (INODE_VERSION(inode) == MINIX_V1)
470 return V1_minix_update_inode(inode);
472 return V2_minix_update_inode(inode);
475 static void minix_write_inode(struct inode * inode, int wait)
477 struct buffer_head *bh;
480 bh = minix_update_inode(inode);
485 int minix_sync_inode(struct inode * inode)
488 struct buffer_head *bh;
490 bh = minix_update_inode(inode);
491 if (bh && buffer_dirty(bh))
493 ll_rw_block(WRITE, 1, &bh);
495 if (buffer_req(bh) && !buffer_uptodate(bh))
497 printk ("IO error syncing minix inode ["
499 kdevname(inode->i_dev), inode->i_ino);
510 * The function that is called for file truncation.
512 void minix_truncate(struct inode * inode)
514 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
516 if (INODE_VERSION(inode) == MINIX_V1)
517 V1_minix_truncate(inode);
519 V2_minix_truncate(inode);
522 static DECLARE_FSTYPE_DEV(minix_fs_type,"minix",minix_read_super);
524 static int __init init_minix_fs(void)
526 return register_filesystem(&minix_fs_type);
529 static void __exit exit_minix_fs(void)
531 unregister_filesystem(&minix_fs_type);
536 module_init(init_minix_fs)
537 module_exit(exit_minix_fs)
538 MODULE_LICENSE("GPL");