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>
14 #include <linux/buffer_head.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/highuid.h>
18 #include <linux/vfs.h>
20 static void minix_read_inode(struct inode * inode);
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);
38 if (!(sb->s_flags & MS_RDONLY)) {
39 sbi->s_ms->s_state = sbi->s_mount_state;
40 mark_buffer_dirty(sbi->s_sbh);
42 for (i = 0; i < sbi->s_imap_blocks; i++)
43 brelse(sbi->s_imap[i]);
44 for (i = 0; i < sbi->s_zmap_blocks; i++)
45 brelse(sbi->s_zmap[i]);
54 static kmem_cache_t * minix_inode_cachep;
56 static struct inode *minix_alloc_inode(struct super_block *sb)
58 struct minix_inode_info *ei;
59 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, SLAB_KERNEL);
62 return &ei->vfs_inode;
65 static void minix_destroy_inode(struct inode *inode)
67 kmem_cache_free(minix_inode_cachep, minix_i(inode));
70 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
72 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
74 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
75 SLAB_CTOR_CONSTRUCTOR)
76 inode_init_once(&ei->vfs_inode);
79 static int init_inodecache(void)
81 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
82 sizeof(struct minix_inode_info),
83 0, (SLAB_RECLAIM_ACCOUNT|
86 if (minix_inode_cachep == NULL)
91 static void destroy_inodecache(void)
93 kmem_cache_destroy(minix_inode_cachep);
96 static 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,
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 ms->s_state = sbi->s_mount_state;
121 mark_buffer_dirty(sbi->s_sbh);
123 /* Mount a partition which is read-only, read-write. */
124 sbi->s_mount_state = ms->s_state;
125 ms->s_state &= ~MINIX_VALID_FS;
126 mark_buffer_dirty(sbi->s_sbh);
128 if (!(sbi->s_mount_state & MINIX_VALID_FS))
129 printk("MINIX-fs warning: remounting unchecked fs, "
130 "running fsck is recommended\n");
131 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
132 printk("MINIX-fs warning: remounting fs with errors, "
133 "running fsck is recommended\n");
138 static int minix_fill_super(struct super_block *s, void *data, int silent)
140 struct buffer_head *bh;
141 struct buffer_head **map;
142 struct minix_super_block *ms;
144 struct inode *root_inode;
145 struct minix_sb_info *sbi;
147 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
152 /* N.B. These should be compile-time tests.
153 Unfortunately that is impossible. */
154 if (32 != sizeof (struct minix_inode))
155 panic("bad V1 i-node size");
156 if (64 != sizeof(struct minix2_inode))
157 panic("bad V2 i-node size");
159 if (!sb_set_blocksize(s, BLOCK_SIZE))
162 if (!(bh = sb_bread(s, 1)))
165 ms = (struct minix_super_block *) bh->b_data;
168 sbi->s_mount_state = ms->s_state;
169 sbi->s_ninodes = ms->s_ninodes;
170 sbi->s_nzones = ms->s_nzones;
171 sbi->s_imap_blocks = ms->s_imap_blocks;
172 sbi->s_zmap_blocks = ms->s_zmap_blocks;
173 sbi->s_firstdatazone = ms->s_firstdatazone;
174 sbi->s_log_zone_size = ms->s_log_zone_size;
175 sbi->s_max_size = ms->s_max_size;
176 s->s_magic = ms->s_magic;
177 if (s->s_magic == MINIX_SUPER_MAGIC) {
178 sbi->s_version = MINIX_V1;
181 sbi->s_link_max = MINIX_LINK_MAX;
182 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
183 sbi->s_version = MINIX_V1;
186 sbi->s_link_max = MINIX_LINK_MAX;
187 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
188 sbi->s_version = MINIX_V2;
189 sbi->s_nzones = ms->s_zones;
192 sbi->s_link_max = MINIX2_LINK_MAX;
193 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
194 sbi->s_version = MINIX_V2;
195 sbi->s_nzones = ms->s_zones;
198 sbi->s_link_max = MINIX2_LINK_MAX;
203 * Allocate the buffer map to keep the superblock small.
205 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
207 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
208 map = kzalloc(i, GFP_KERNEL);
211 sbi->s_imap = &map[0];
212 sbi->s_zmap = &map[sbi->s_imap_blocks];
215 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
216 if (!(sbi->s_imap[i]=sb_bread(s, block)))
220 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
221 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
226 minix_set_bit(0,sbi->s_imap[0]->b_data);
227 minix_set_bit(0,sbi->s_zmap[0]->b_data);
229 /* set up enough so that it can read an inode */
230 s->s_op = &minix_sops;
231 root_inode = iget(s, MINIX_ROOT_INO);
232 if (!root_inode || is_bad_inode(root_inode))
235 s->s_root = d_alloc_root(root_inode);
240 s->s_root->d_op = &minix_dentry_operations;
242 if (!(s->s_flags & MS_RDONLY)) {
243 ms->s_state &= ~MINIX_VALID_FS;
244 mark_buffer_dirty(bh);
246 if (!(sbi->s_mount_state & MINIX_VALID_FS))
247 printk("MINIX-fs: mounting unchecked file system, "
248 "running fsck is recommended\n");
249 else if (sbi->s_mount_state & MINIX_ERROR_FS)
250 printk("MINIX-fs: mounting file system with errors, "
251 "running fsck is recommended\n");
260 printk("MINIX-fs: get root inode failed\n");
264 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
266 for (i = 0; i < sbi->s_imap_blocks; i++)
267 brelse(sbi->s_imap[i]);
268 for (i = 0; i < sbi->s_zmap_blocks; i++)
269 brelse(sbi->s_zmap[i]);
275 printk("MINIX-fs: can't allocate map\n");
280 printk("MINIX-fs: bad superblock\n");
285 printk("VFS: Can't find a Minix or Minix V2 filesystem "
286 "on device %s\n", s->s_id);
292 printk("MINIX-fs: blocksize too small for device\n");
296 printk("MINIX-fs: unable to read superblock\n");
303 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
305 struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
306 buf->f_type = dentry->d_sb->s_magic;
307 buf->f_bsize = dentry->d_sb->s_blocksize;
308 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
309 buf->f_bfree = minix_count_free_blocks(sbi);
310 buf->f_bavail = buf->f_bfree;
311 buf->f_files = sbi->s_ninodes;
312 buf->f_ffree = minix_count_free_inodes(sbi);
313 buf->f_namelen = sbi->s_namelen;
317 static int minix_get_block(struct inode *inode, sector_t block,
318 struct buffer_head *bh_result, int create)
320 if (INODE_VERSION(inode) == MINIX_V1)
321 return V1_minix_get_block(inode, block, bh_result, create);
323 return V2_minix_get_block(inode, block, bh_result, create);
326 static int minix_writepage(struct page *page, struct writeback_control *wbc)
328 return block_write_full_page(page, minix_get_block, wbc);
330 static int minix_readpage(struct file *file, struct page *page)
332 return block_read_full_page(page,minix_get_block);
334 static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
336 return block_prepare_write(page,from,to,minix_get_block);
338 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
340 return generic_block_bmap(mapping,block,minix_get_block);
342 static const struct address_space_operations minix_aops = {
343 .readpage = minix_readpage,
344 .writepage = minix_writepage,
345 .sync_page = block_sync_page,
346 .prepare_write = minix_prepare_write,
347 .commit_write = generic_commit_write,
351 static struct inode_operations minix_symlink_inode_operations = {
352 .readlink = generic_readlink,
353 .follow_link = page_follow_link_light,
354 .put_link = page_put_link,
355 .getattr = minix_getattr,
358 void minix_set_inode(struct inode *inode, dev_t rdev)
360 if (S_ISREG(inode->i_mode)) {
361 inode->i_op = &minix_file_inode_operations;
362 inode->i_fop = &minix_file_operations;
363 inode->i_mapping->a_ops = &minix_aops;
364 } else if (S_ISDIR(inode->i_mode)) {
365 inode->i_op = &minix_dir_inode_operations;
366 inode->i_fop = &minix_dir_operations;
367 inode->i_mapping->a_ops = &minix_aops;
368 } else if (S_ISLNK(inode->i_mode)) {
369 inode->i_op = &minix_symlink_inode_operations;
370 inode->i_mapping->a_ops = &minix_aops;
372 init_special_inode(inode, inode->i_mode, rdev);
376 * The minix V1 function to read an inode.
378 static void V1_minix_read_inode(struct inode * inode)
380 struct buffer_head * bh;
381 struct minix_inode * raw_inode;
382 struct minix_inode_info *minix_inode = minix_i(inode);
385 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
387 make_bad_inode(inode);
390 inode->i_mode = raw_inode->i_mode;
391 inode->i_uid = (uid_t)raw_inode->i_uid;
392 inode->i_gid = (gid_t)raw_inode->i_gid;
393 inode->i_nlink = raw_inode->i_nlinks;
394 inode->i_size = raw_inode->i_size;
395 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
396 inode->i_mtime.tv_nsec = 0;
397 inode->i_atime.tv_nsec = 0;
398 inode->i_ctime.tv_nsec = 0;
400 for (i = 0; i < 9; i++)
401 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
402 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
407 * The minix V2 function to read an inode.
409 static void V2_minix_read_inode(struct inode * inode)
411 struct buffer_head * bh;
412 struct minix2_inode * raw_inode;
413 struct minix_inode_info *minix_inode = minix_i(inode);
416 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
418 make_bad_inode(inode);
421 inode->i_mode = raw_inode->i_mode;
422 inode->i_uid = (uid_t)raw_inode->i_uid;
423 inode->i_gid = (gid_t)raw_inode->i_gid;
424 inode->i_nlink = raw_inode->i_nlinks;
425 inode->i_size = raw_inode->i_size;
426 inode->i_mtime.tv_sec = raw_inode->i_mtime;
427 inode->i_atime.tv_sec = raw_inode->i_atime;
428 inode->i_ctime.tv_sec = raw_inode->i_ctime;
429 inode->i_mtime.tv_nsec = 0;
430 inode->i_atime.tv_nsec = 0;
431 inode->i_ctime.tv_nsec = 0;
433 for (i = 0; i < 10; i++)
434 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
435 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
440 * The global function to read an inode.
442 static void minix_read_inode(struct inode * inode)
444 if (INODE_VERSION(inode) == MINIX_V1)
445 V1_minix_read_inode(inode);
447 V2_minix_read_inode(inode);
451 * The minix V1 function to synchronize an inode.
453 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
455 struct buffer_head * bh;
456 struct minix_inode * raw_inode;
457 struct minix_inode_info *minix_inode = minix_i(inode);
460 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
463 raw_inode->i_mode = inode->i_mode;
464 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
465 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
466 raw_inode->i_nlinks = inode->i_nlink;
467 raw_inode->i_size = inode->i_size;
468 raw_inode->i_time = inode->i_mtime.tv_sec;
469 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
470 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
471 else for (i = 0; i < 9; i++)
472 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
473 mark_buffer_dirty(bh);
478 * The minix V2 function to synchronize an inode.
480 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
482 struct buffer_head * bh;
483 struct minix2_inode * raw_inode;
484 struct minix_inode_info *minix_inode = minix_i(inode);
487 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
490 raw_inode->i_mode = inode->i_mode;
491 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
492 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
493 raw_inode->i_nlinks = inode->i_nlink;
494 raw_inode->i_size = inode->i_size;
495 raw_inode->i_mtime = inode->i_mtime.tv_sec;
496 raw_inode->i_atime = inode->i_atime.tv_sec;
497 raw_inode->i_ctime = inode->i_ctime.tv_sec;
498 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
499 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
500 else for (i = 0; i < 10; i++)
501 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
502 mark_buffer_dirty(bh);
506 static struct buffer_head *minix_update_inode(struct inode *inode)
508 if (INODE_VERSION(inode) == MINIX_V1)
509 return V1_minix_update_inode(inode);
511 return V2_minix_update_inode(inode);
514 static int minix_write_inode(struct inode * inode, int wait)
516 brelse(minix_update_inode(inode));
520 int minix_sync_inode(struct inode * inode)
523 struct buffer_head *bh;
525 bh = minix_update_inode(inode);
526 if (bh && buffer_dirty(bh))
528 sync_dirty_buffer(bh);
529 if (buffer_req(bh) && !buffer_uptodate(bh))
531 printk("IO error syncing minix inode [%s:%08lx]\n",
532 inode->i_sb->s_id, inode->i_ino);
542 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
544 generic_fillattr(dentry->d_inode, stat);
545 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
546 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size);
548 stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size);
549 stat->blksize = BLOCK_SIZE;
554 * The function that is called for file truncation.
556 void minix_truncate(struct inode * inode)
558 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
560 if (INODE_VERSION(inode) == MINIX_V1)
561 V1_minix_truncate(inode);
563 V2_minix_truncate(inode);
566 static int minix_get_sb(struct file_system_type *fs_type,
567 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
569 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
573 static struct file_system_type minix_fs_type = {
574 .owner = THIS_MODULE,
576 .get_sb = minix_get_sb,
577 .kill_sb = kill_block_super,
578 .fs_flags = FS_REQUIRES_DEV,
581 static int __init init_minix_fs(void)
583 int err = init_inodecache();
586 err = register_filesystem(&minix_fs_type);
591 destroy_inodecache();
596 static void __exit exit_minix_fs(void)
598 unregister_filesystem(&minix_fs_type);
599 destroy_inodecache();
602 module_init(init_minix_fs)
603 module_exit(exit_minix_fs)
604 MODULE_LICENSE("GPL");