2 * linux/fs/minix/inode.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1996 Gertjan van Wingerde
9 * Modified for 680x0 by Andreas Schwab
10 * Updated to filesystem version 3 by Daniel Aragones
13 #include <linux/module.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>
21 static int minix_write_inode(struct inode * inode, int wait);
22 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
23 static int minix_remount (struct super_block * sb, int * flags, char * data);
25 static void minix_delete_inode(struct inode *inode)
27 truncate_inode_pages(&inode->i_data, 0);
29 minix_truncate(inode);
30 minix_free_inode(inode);
33 static void minix_put_super(struct super_block *sb)
36 struct minix_sb_info *sbi = minix_sb(sb);
40 if (!(sb->s_flags & MS_RDONLY)) {
41 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
42 sbi->s_ms->s_state = sbi->s_mount_state;
43 mark_buffer_dirty(sbi->s_sbh);
45 for (i = 0; i < sbi->s_imap_blocks; i++)
46 brelse(sbi->s_imap[i]);
47 for (i = 0; i < sbi->s_zmap_blocks; i++)
48 brelse(sbi->s_zmap[i]);
57 static struct kmem_cache * minix_inode_cachep;
59 static struct inode *minix_alloc_inode(struct super_block *sb)
61 struct minix_inode_info *ei;
62 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
65 return &ei->vfs_inode;
68 static void minix_destroy_inode(struct inode *inode)
70 kmem_cache_free(minix_inode_cachep, minix_i(inode));
73 static void init_once(void *foo)
75 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
77 inode_init_once(&ei->vfs_inode);
80 static int init_inodecache(void)
82 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
83 sizeof(struct minix_inode_info),
84 0, (SLAB_RECLAIM_ACCOUNT|
87 if (minix_inode_cachep == NULL)
92 static void destroy_inodecache(void)
94 kmem_cache_destroy(minix_inode_cachep);
97 static const struct super_operations minix_sops = {
98 .alloc_inode = minix_alloc_inode,
99 .destroy_inode = minix_destroy_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,
107 static int minix_remount (struct super_block * sb, int * flags, char * data)
109 struct minix_sb_info * sbi = minix_sb(sb);
110 struct minix_super_block * ms;
113 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
115 if (*flags & MS_RDONLY) {
116 if (ms->s_state & MINIX_VALID_FS ||
117 !(sbi->s_mount_state & MINIX_VALID_FS))
119 /* Mounting a rw partition read-only. */
120 if (sbi->s_version != MINIX_V3)
121 ms->s_state = sbi->s_mount_state;
122 mark_buffer_dirty(sbi->s_sbh);
124 /* Mount a partition which is read-only, read-write. */
125 if (sbi->s_version != MINIX_V3) {
126 sbi->s_mount_state = ms->s_state;
127 ms->s_state &= ~MINIX_VALID_FS;
129 sbi->s_mount_state = MINIX_VALID_FS;
131 mark_buffer_dirty(sbi->s_sbh);
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");
143 static int minix_fill_super(struct super_block *s, void *data, int silent)
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;
154 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
159 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
160 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
162 if (!sb_set_blocksize(s, BLOCK_SIZE))
165 if (!(bh = sb_bread(s, 1)))
168 ms = (struct minix_super_block *) bh->b_data;
171 sbi->s_mount_state = ms->s_state;
172 sbi->s_ninodes = ms->s_ninodes;
173 sbi->s_nzones = ms->s_nzones;
174 sbi->s_imap_blocks = ms->s_imap_blocks;
175 sbi->s_zmap_blocks = ms->s_zmap_blocks;
176 sbi->s_firstdatazone = ms->s_firstdatazone;
177 sbi->s_log_zone_size = ms->s_log_zone_size;
178 sbi->s_max_size = ms->s_max_size;
179 s->s_magic = ms->s_magic;
180 if (s->s_magic == MINIX_SUPER_MAGIC) {
181 sbi->s_version = MINIX_V1;
184 sbi->s_link_max = MINIX_LINK_MAX;
185 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
186 sbi->s_version = MINIX_V1;
189 sbi->s_link_max = MINIX_LINK_MAX;
190 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
191 sbi->s_version = MINIX_V2;
192 sbi->s_nzones = ms->s_zones;
195 sbi->s_link_max = MINIX2_LINK_MAX;
196 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
197 sbi->s_version = MINIX_V2;
198 sbi->s_nzones = ms->s_zones;
201 sbi->s_link_max = MINIX2_LINK_MAX;
202 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
203 m3s = (struct minix3_super_block *) bh->b_data;
204 s->s_magic = m3s->s_magic;
205 sbi->s_imap_blocks = m3s->s_imap_blocks;
206 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
207 sbi->s_firstdatazone = m3s->s_firstdatazone;
208 sbi->s_log_zone_size = m3s->s_log_zone_size;
209 sbi->s_max_size = m3s->s_max_size;
210 sbi->s_ninodes = m3s->s_ninodes;
211 sbi->s_nzones = m3s->s_zones;
214 sbi->s_version = MINIX_V3;
215 sbi->s_link_max = MINIX2_LINK_MAX;
216 sbi->s_mount_state = MINIX_VALID_FS;
217 sb_set_blocksize(s, m3s->s_blocksize);
222 * Allocate the buffer map to keep the superblock small.
224 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
226 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
227 map = kzalloc(i, GFP_KERNEL);
230 sbi->s_imap = &map[0];
231 sbi->s_zmap = &map[sbi->s_imap_blocks];
234 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
235 if (!(sbi->s_imap[i]=sb_bread(s, block)))
239 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
240 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
245 minix_set_bit(0,sbi->s_imap[0]->b_data);
246 minix_set_bit(0,sbi->s_zmap[0]->b_data);
248 /* set up enough so that it can read an inode */
249 s->s_op = &minix_sops;
250 root_inode = minix_iget(s, MINIX_ROOT_INO);
251 if (IS_ERR(root_inode)) {
252 ret = PTR_ERR(root_inode);
257 s->s_root = d_alloc_root(root_inode);
261 if (!(s->s_flags & MS_RDONLY)) {
262 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
263 ms->s_state &= ~MINIX_VALID_FS;
264 mark_buffer_dirty(bh);
266 if (!(sbi->s_mount_state & MINIX_VALID_FS))
267 printk("MINIX-fs: mounting unchecked file system, "
268 "running fsck is recommended\n");
269 else if (sbi->s_mount_state & MINIX_ERROR_FS)
270 printk("MINIX-fs: mounting file system with errors, "
271 "running fsck is recommended\n");
280 printk("MINIX-fs: get root inode failed\n");
284 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
286 for (i = 0; i < sbi->s_imap_blocks; i++)
287 brelse(sbi->s_imap[i]);
288 for (i = 0; i < sbi->s_zmap_blocks; i++)
289 brelse(sbi->s_zmap[i]);
296 printk("MINIX-fs: can't allocate map\n");
301 printk("MINIX-fs: bad superblock\n");
306 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
307 "on device %s.\n", s->s_id);
313 printk("MINIX-fs: blocksize too small for device\n");
317 printk("MINIX-fs: unable to read superblock\n");
324 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
326 struct super_block *sb = dentry->d_sb;
327 struct minix_sb_info *sbi = minix_sb(sb);
328 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
329 buf->f_type = sb->s_magic;
330 buf->f_bsize = sb->s_blocksize;
331 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
332 buf->f_bfree = minix_count_free_blocks(sbi);
333 buf->f_bavail = buf->f_bfree;
334 buf->f_files = sbi->s_ninodes;
335 buf->f_ffree = minix_count_free_inodes(sbi);
336 buf->f_namelen = sbi->s_namelen;
337 buf->f_fsid.val[0] = (u32)id;
338 buf->f_fsid.val[1] = (u32)(id >> 32);
343 static int minix_get_block(struct inode *inode, sector_t block,
344 struct buffer_head *bh_result, int create)
346 if (INODE_VERSION(inode) == MINIX_V1)
347 return V1_minix_get_block(inode, block, bh_result, create);
349 return V2_minix_get_block(inode, block, bh_result, create);
352 static int minix_writepage(struct page *page, struct writeback_control *wbc)
354 return block_write_full_page(page, minix_get_block, wbc);
357 static int minix_readpage(struct file *file, struct page *page)
359 return block_read_full_page(page,minix_get_block);
362 int __minix_write_begin(struct file *file, struct address_space *mapping,
363 loff_t pos, unsigned len, unsigned flags,
364 struct page **pagep, void **fsdata)
366 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
370 static int minix_write_begin(struct file *file, struct address_space *mapping,
371 loff_t pos, unsigned len, unsigned flags,
372 struct page **pagep, void **fsdata)
375 return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
378 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
380 return generic_block_bmap(mapping,block,minix_get_block);
383 static const struct address_space_operations minix_aops = {
384 .readpage = minix_readpage,
385 .writepage = minix_writepage,
386 .sync_page = block_sync_page,
387 .write_begin = minix_write_begin,
388 .write_end = generic_write_end,
392 static const struct inode_operations minix_symlink_inode_operations = {
393 .readlink = generic_readlink,
394 .follow_link = page_follow_link_light,
395 .put_link = page_put_link,
396 .getattr = minix_getattr,
399 void minix_set_inode(struct inode *inode, dev_t rdev)
401 if (S_ISREG(inode->i_mode)) {
402 inode->i_op = &minix_file_inode_operations;
403 inode->i_fop = &minix_file_operations;
404 inode->i_mapping->a_ops = &minix_aops;
405 } else if (S_ISDIR(inode->i_mode)) {
406 inode->i_op = &minix_dir_inode_operations;
407 inode->i_fop = &minix_dir_operations;
408 inode->i_mapping->a_ops = &minix_aops;
409 } else if (S_ISLNK(inode->i_mode)) {
410 inode->i_op = &minix_symlink_inode_operations;
411 inode->i_mapping->a_ops = &minix_aops;
413 init_special_inode(inode, inode->i_mode, rdev);
417 * The minix V1 function to read an inode.
419 static struct inode *V1_minix_iget(struct inode *inode)
421 struct buffer_head * bh;
422 struct minix_inode * raw_inode;
423 struct minix_inode_info *minix_inode = minix_i(inode);
426 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
429 return ERR_PTR(-EIO);
431 inode->i_mode = raw_inode->i_mode;
432 inode->i_uid = (uid_t)raw_inode->i_uid;
433 inode->i_gid = (gid_t)raw_inode->i_gid;
434 inode->i_nlink = raw_inode->i_nlinks;
435 inode->i_size = raw_inode->i_size;
436 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
437 inode->i_mtime.tv_nsec = 0;
438 inode->i_atime.tv_nsec = 0;
439 inode->i_ctime.tv_nsec = 0;
441 for (i = 0; i < 9; i++)
442 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
443 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
445 unlock_new_inode(inode);
450 * The minix V2 function to read an inode.
452 static struct inode *V2_minix_iget(struct inode *inode)
454 struct buffer_head * bh;
455 struct minix2_inode * raw_inode;
456 struct minix_inode_info *minix_inode = minix_i(inode);
459 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
462 return ERR_PTR(-EIO);
464 inode->i_mode = raw_inode->i_mode;
465 inode->i_uid = (uid_t)raw_inode->i_uid;
466 inode->i_gid = (gid_t)raw_inode->i_gid;
467 inode->i_nlink = raw_inode->i_nlinks;
468 inode->i_size = raw_inode->i_size;
469 inode->i_mtime.tv_sec = raw_inode->i_mtime;
470 inode->i_atime.tv_sec = raw_inode->i_atime;
471 inode->i_ctime.tv_sec = raw_inode->i_ctime;
472 inode->i_mtime.tv_nsec = 0;
473 inode->i_atime.tv_nsec = 0;
474 inode->i_ctime.tv_nsec = 0;
476 for (i = 0; i < 10; i++)
477 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
478 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
480 unlock_new_inode(inode);
485 * The global function to read an inode.
487 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
491 inode = iget_locked(sb, ino);
493 return ERR_PTR(-ENOMEM);
494 if (!(inode->i_state & I_NEW))
497 if (INODE_VERSION(inode) == MINIX_V1)
498 return V1_minix_iget(inode);
500 return V2_minix_iget(inode);
504 * The minix V1 function to synchronize an inode.
506 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
508 struct buffer_head * bh;
509 struct minix_inode * raw_inode;
510 struct minix_inode_info *minix_inode = minix_i(inode);
513 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
516 raw_inode->i_mode = inode->i_mode;
517 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
518 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
519 raw_inode->i_nlinks = inode->i_nlink;
520 raw_inode->i_size = inode->i_size;
521 raw_inode->i_time = inode->i_mtime.tv_sec;
522 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
523 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
524 else for (i = 0; i < 9; i++)
525 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
526 mark_buffer_dirty(bh);
531 * The minix V2 function to synchronize an inode.
533 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
535 struct buffer_head * bh;
536 struct minix2_inode * raw_inode;
537 struct minix_inode_info *minix_inode = minix_i(inode);
540 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
543 raw_inode->i_mode = inode->i_mode;
544 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
545 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
546 raw_inode->i_nlinks = inode->i_nlink;
547 raw_inode->i_size = inode->i_size;
548 raw_inode->i_mtime = inode->i_mtime.tv_sec;
549 raw_inode->i_atime = inode->i_atime.tv_sec;
550 raw_inode->i_ctime = inode->i_ctime.tv_sec;
551 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
552 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
553 else for (i = 0; i < 10; i++)
554 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
555 mark_buffer_dirty(bh);
559 static int minix_write_inode(struct inode *inode, int wait)
562 struct buffer_head *bh;
564 if (INODE_VERSION(inode) == MINIX_V1)
565 bh = V1_minix_update_inode(inode);
567 bh = V2_minix_update_inode(inode);
570 if (wait && buffer_dirty(bh)) {
571 sync_dirty_buffer(bh);
572 if (buffer_req(bh) && !buffer_uptodate(bh)) {
573 printk("IO error syncing minix inode [%s:%08lx]\n",
574 inode->i_sb->s_id, inode->i_ino);
582 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
584 struct inode *dir = dentry->d_parent->d_inode;
585 struct super_block *sb = dir->i_sb;
586 generic_fillattr(dentry->d_inode, stat);
587 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
588 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
590 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
591 stat->blksize = sb->s_blocksize;
596 * The function that is called for file truncation.
598 void minix_truncate(struct inode * inode)
600 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
602 if (INODE_VERSION(inode) == MINIX_V1)
603 V1_minix_truncate(inode);
605 V2_minix_truncate(inode);
608 static int minix_get_sb(struct file_system_type *fs_type,
609 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
611 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
615 static struct file_system_type minix_fs_type = {
616 .owner = THIS_MODULE,
618 .get_sb = minix_get_sb,
619 .kill_sb = kill_block_super,
620 .fs_flags = FS_REQUIRES_DEV,
623 static int __init init_minix_fs(void)
625 int err = init_inodecache();
628 err = register_filesystem(&minix_fs_type);
633 destroy_inodecache();
638 static void __exit exit_minix_fs(void)
640 unregister_filesystem(&minix_fs_type);
641 destroy_inodecache();
644 module_init(init_minix_fs)
645 module_exit(exit_minix_fs)
646 MODULE_LICENSE("GPL");