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);
38 if (!(sb->s_flags & MS_RDONLY)) {
39 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
40 sbi->s_ms->s_state = sbi->s_mount_state;
41 mark_buffer_dirty(sbi->s_sbh);
43 for (i = 0; i < sbi->s_imap_blocks; i++)
44 brelse(sbi->s_imap[i]);
45 for (i = 0; i < sbi->s_zmap_blocks; i++)
46 brelse(sbi->s_zmap[i]);
55 static struct kmem_cache * minix_inode_cachep;
57 static struct inode *minix_alloc_inode(struct super_block *sb)
59 struct minix_inode_info *ei;
60 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
63 return &ei->vfs_inode;
66 static void minix_destroy_inode(struct inode *inode)
68 kmem_cache_free(minix_inode_cachep, minix_i(inode));
71 static void init_once(void *foo)
73 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
75 inode_init_once(&ei->vfs_inode);
78 static int init_inodecache(void)
80 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
81 sizeof(struct minix_inode_info),
82 0, (SLAB_RECLAIM_ACCOUNT|
85 if (minix_inode_cachep == NULL)
90 static void destroy_inodecache(void)
92 kmem_cache_destroy(minix_inode_cachep);
95 static const struct super_operations minix_sops = {
96 .alloc_inode = minix_alloc_inode,
97 .destroy_inode = minix_destroy_inode,
98 .write_inode = minix_write_inode,
99 .delete_inode = minix_delete_inode,
100 .put_super = minix_put_super,
101 .statfs = minix_statfs,
102 .remount_fs = minix_remount,
105 static int minix_remount (struct super_block * sb, int * flags, char * data)
107 struct minix_sb_info * sbi = minix_sb(sb);
108 struct minix_super_block * ms;
111 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
113 if (*flags & MS_RDONLY) {
114 if (ms->s_state & MINIX_VALID_FS ||
115 !(sbi->s_mount_state & MINIX_VALID_FS))
117 /* Mounting a rw partition read-only. */
118 if (sbi->s_version != MINIX_V3)
119 ms->s_state = sbi->s_mount_state;
120 mark_buffer_dirty(sbi->s_sbh);
122 /* Mount a partition which is read-only, read-write. */
123 if (sbi->s_version != MINIX_V3) {
124 sbi->s_mount_state = ms->s_state;
125 ms->s_state &= ~MINIX_VALID_FS;
127 sbi->s_mount_state = MINIX_VALID_FS;
129 mark_buffer_dirty(sbi->s_sbh);
131 if (!(sbi->s_mount_state & MINIX_VALID_FS))
132 printk("MINIX-fs warning: remounting unchecked fs, "
133 "running fsck is recommended\n");
134 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
135 printk("MINIX-fs warning: remounting fs with errors, "
136 "running fsck is recommended\n");
141 static int minix_fill_super(struct super_block *s, void *data, int silent)
143 struct buffer_head *bh;
144 struct buffer_head **map;
145 struct minix_super_block *ms;
146 struct minix3_super_block *m3s = NULL;
147 unsigned long i, block;
148 struct inode *root_inode;
149 struct minix_sb_info *sbi;
152 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
157 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
158 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
160 if (!sb_set_blocksize(s, BLOCK_SIZE))
163 if (!(bh = sb_bread(s, 1)))
166 ms = (struct minix_super_block *) bh->b_data;
169 sbi->s_mount_state = ms->s_state;
170 sbi->s_ninodes = ms->s_ninodes;
171 sbi->s_nzones = ms->s_nzones;
172 sbi->s_imap_blocks = ms->s_imap_blocks;
173 sbi->s_zmap_blocks = ms->s_zmap_blocks;
174 sbi->s_firstdatazone = ms->s_firstdatazone;
175 sbi->s_log_zone_size = ms->s_log_zone_size;
176 sbi->s_max_size = ms->s_max_size;
177 s->s_magic = ms->s_magic;
178 if (s->s_magic == MINIX_SUPER_MAGIC) {
179 sbi->s_version = MINIX_V1;
182 sbi->s_link_max = MINIX_LINK_MAX;
183 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
184 sbi->s_version = MINIX_V1;
187 sbi->s_link_max = MINIX_LINK_MAX;
188 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
189 sbi->s_version = MINIX_V2;
190 sbi->s_nzones = ms->s_zones;
193 sbi->s_link_max = MINIX2_LINK_MAX;
194 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
195 sbi->s_version = MINIX_V2;
196 sbi->s_nzones = ms->s_zones;
199 sbi->s_link_max = MINIX2_LINK_MAX;
200 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
201 m3s = (struct minix3_super_block *) bh->b_data;
202 s->s_magic = m3s->s_magic;
203 sbi->s_imap_blocks = m3s->s_imap_blocks;
204 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
205 sbi->s_firstdatazone = m3s->s_firstdatazone;
206 sbi->s_log_zone_size = m3s->s_log_zone_size;
207 sbi->s_max_size = m3s->s_max_size;
208 sbi->s_ninodes = m3s->s_ninodes;
209 sbi->s_nzones = m3s->s_zones;
212 sbi->s_version = MINIX_V3;
213 sbi->s_link_max = MINIX2_LINK_MAX;
214 sbi->s_mount_state = MINIX_VALID_FS;
215 sb_set_blocksize(s, m3s->s_blocksize);
220 * Allocate the buffer map to keep the superblock small.
222 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
224 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
225 map = kzalloc(i, GFP_KERNEL);
228 sbi->s_imap = &map[0];
229 sbi->s_zmap = &map[sbi->s_imap_blocks];
232 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
233 if (!(sbi->s_imap[i]=sb_bread(s, block)))
237 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
238 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
243 minix_set_bit(0,sbi->s_imap[0]->b_data);
244 minix_set_bit(0,sbi->s_zmap[0]->b_data);
246 /* set up enough so that it can read an inode */
247 s->s_op = &minix_sops;
248 root_inode = minix_iget(s, MINIX_ROOT_INO);
249 if (IS_ERR(root_inode)) {
250 ret = PTR_ERR(root_inode);
255 s->s_root = d_alloc_root(root_inode);
259 if (!(s->s_flags & MS_RDONLY)) {
260 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
261 ms->s_state &= ~MINIX_VALID_FS;
262 mark_buffer_dirty(bh);
264 if (!(sbi->s_mount_state & MINIX_VALID_FS))
265 printk("MINIX-fs: mounting unchecked file system, "
266 "running fsck is recommended\n");
267 else if (sbi->s_mount_state & MINIX_ERROR_FS)
268 printk("MINIX-fs: mounting file system with errors, "
269 "running fsck is recommended\n");
278 printk("MINIX-fs: get root inode failed\n");
282 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
284 for (i = 0; i < sbi->s_imap_blocks; i++)
285 brelse(sbi->s_imap[i]);
286 for (i = 0; i < sbi->s_zmap_blocks; i++)
287 brelse(sbi->s_zmap[i]);
294 printk("MINIX-fs: can't allocate map\n");
299 printk("MINIX-fs: bad superblock\n");
304 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
305 "on device %s.\n", s->s_id);
311 printk("MINIX-fs: blocksize too small for device\n");
315 printk("MINIX-fs: unable to read superblock\n");
322 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
324 struct super_block *sb = dentry->d_sb;
325 struct minix_sb_info *sbi = minix_sb(sb);
326 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
327 buf->f_type = sb->s_magic;
328 buf->f_bsize = sb->s_blocksize;
329 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
330 buf->f_bfree = minix_count_free_blocks(sbi);
331 buf->f_bavail = buf->f_bfree;
332 buf->f_files = sbi->s_ninodes;
333 buf->f_ffree = minix_count_free_inodes(sbi);
334 buf->f_namelen = sbi->s_namelen;
335 buf->f_fsid.val[0] = (u32)id;
336 buf->f_fsid.val[1] = (u32)(id >> 32);
341 static int minix_get_block(struct inode *inode, sector_t block,
342 struct buffer_head *bh_result, int create)
344 if (INODE_VERSION(inode) == MINIX_V1)
345 return V1_minix_get_block(inode, block, bh_result, create);
347 return V2_minix_get_block(inode, block, bh_result, create);
350 static int minix_writepage(struct page *page, struct writeback_control *wbc)
352 return block_write_full_page(page, minix_get_block, wbc);
355 static int minix_readpage(struct file *file, struct page *page)
357 return block_read_full_page(page,minix_get_block);
360 int __minix_write_begin(struct file *file, struct address_space *mapping,
361 loff_t pos, unsigned len, unsigned flags,
362 struct page **pagep, void **fsdata)
364 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
368 static int minix_write_begin(struct file *file, struct address_space *mapping,
369 loff_t pos, unsigned len, unsigned flags,
370 struct page **pagep, void **fsdata)
373 return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
376 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
378 return generic_block_bmap(mapping,block,minix_get_block);
381 static const struct address_space_operations minix_aops = {
382 .readpage = minix_readpage,
383 .writepage = minix_writepage,
384 .sync_page = block_sync_page,
385 .write_begin = minix_write_begin,
386 .write_end = generic_write_end,
390 static const struct inode_operations minix_symlink_inode_operations = {
391 .readlink = generic_readlink,
392 .follow_link = page_follow_link_light,
393 .put_link = page_put_link,
394 .getattr = minix_getattr,
397 void minix_set_inode(struct inode *inode, dev_t rdev)
399 if (S_ISREG(inode->i_mode)) {
400 inode->i_op = &minix_file_inode_operations;
401 inode->i_fop = &minix_file_operations;
402 inode->i_mapping->a_ops = &minix_aops;
403 } else if (S_ISDIR(inode->i_mode)) {
404 inode->i_op = &minix_dir_inode_operations;
405 inode->i_fop = &minix_dir_operations;
406 inode->i_mapping->a_ops = &minix_aops;
407 } else if (S_ISLNK(inode->i_mode)) {
408 inode->i_op = &minix_symlink_inode_operations;
409 inode->i_mapping->a_ops = &minix_aops;
411 init_special_inode(inode, inode->i_mode, rdev);
415 * The minix V1 function to read an inode.
417 static struct inode *V1_minix_iget(struct inode *inode)
419 struct buffer_head * bh;
420 struct minix_inode * raw_inode;
421 struct minix_inode_info *minix_inode = minix_i(inode);
424 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
427 return ERR_PTR(-EIO);
429 inode->i_mode = raw_inode->i_mode;
430 inode->i_uid = (uid_t)raw_inode->i_uid;
431 inode->i_gid = (gid_t)raw_inode->i_gid;
432 inode->i_nlink = raw_inode->i_nlinks;
433 inode->i_size = raw_inode->i_size;
434 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
435 inode->i_mtime.tv_nsec = 0;
436 inode->i_atime.tv_nsec = 0;
437 inode->i_ctime.tv_nsec = 0;
439 for (i = 0; i < 9; i++)
440 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
441 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
443 unlock_new_inode(inode);
448 * The minix V2 function to read an inode.
450 static struct inode *V2_minix_iget(struct inode *inode)
452 struct buffer_head * bh;
453 struct minix2_inode * raw_inode;
454 struct minix_inode_info *minix_inode = minix_i(inode);
457 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
460 return ERR_PTR(-EIO);
462 inode->i_mode = raw_inode->i_mode;
463 inode->i_uid = (uid_t)raw_inode->i_uid;
464 inode->i_gid = (gid_t)raw_inode->i_gid;
465 inode->i_nlink = raw_inode->i_nlinks;
466 inode->i_size = raw_inode->i_size;
467 inode->i_mtime.tv_sec = raw_inode->i_mtime;
468 inode->i_atime.tv_sec = raw_inode->i_atime;
469 inode->i_ctime.tv_sec = raw_inode->i_ctime;
470 inode->i_mtime.tv_nsec = 0;
471 inode->i_atime.tv_nsec = 0;
472 inode->i_ctime.tv_nsec = 0;
474 for (i = 0; i < 10; i++)
475 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
476 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
478 unlock_new_inode(inode);
483 * The global function to read an inode.
485 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
489 inode = iget_locked(sb, ino);
491 return ERR_PTR(-ENOMEM);
492 if (!(inode->i_state & I_NEW))
495 if (INODE_VERSION(inode) == MINIX_V1)
496 return V1_minix_iget(inode);
498 return V2_minix_iget(inode);
502 * The minix V1 function to synchronize an inode.
504 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
506 struct buffer_head * bh;
507 struct minix_inode * raw_inode;
508 struct minix_inode_info *minix_inode = minix_i(inode);
511 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
514 raw_inode->i_mode = inode->i_mode;
515 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
516 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
517 raw_inode->i_nlinks = inode->i_nlink;
518 raw_inode->i_size = inode->i_size;
519 raw_inode->i_time = inode->i_mtime.tv_sec;
520 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
521 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
522 else for (i = 0; i < 9; i++)
523 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
524 mark_buffer_dirty(bh);
529 * The minix V2 function to synchronize an inode.
531 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
533 struct buffer_head * bh;
534 struct minix2_inode * raw_inode;
535 struct minix_inode_info *minix_inode = minix_i(inode);
538 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
541 raw_inode->i_mode = inode->i_mode;
542 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
543 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
544 raw_inode->i_nlinks = inode->i_nlink;
545 raw_inode->i_size = inode->i_size;
546 raw_inode->i_mtime = inode->i_mtime.tv_sec;
547 raw_inode->i_atime = inode->i_atime.tv_sec;
548 raw_inode->i_ctime = inode->i_ctime.tv_sec;
549 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
550 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
551 else for (i = 0; i < 10; i++)
552 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
553 mark_buffer_dirty(bh);
557 static struct buffer_head *minix_update_inode(struct inode *inode)
559 if (INODE_VERSION(inode) == MINIX_V1)
560 return V1_minix_update_inode(inode);
562 return V2_minix_update_inode(inode);
565 static int minix_write_inode(struct inode * inode, int wait)
567 brelse(minix_update_inode(inode));
571 int minix_sync_inode(struct inode * inode)
574 struct buffer_head *bh;
576 bh = minix_update_inode(inode);
577 if (bh && buffer_dirty(bh))
579 sync_dirty_buffer(bh);
580 if (buffer_req(bh) && !buffer_uptodate(bh))
582 printk("IO error syncing minix inode [%s:%08lx]\n",
583 inode->i_sb->s_id, inode->i_ino);
593 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
595 struct inode *dir = dentry->d_parent->d_inode;
596 struct super_block *sb = dir->i_sb;
597 generic_fillattr(dentry->d_inode, stat);
598 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
599 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
601 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
602 stat->blksize = sb->s_blocksize;
607 * The function that is called for file truncation.
609 void minix_truncate(struct inode * inode)
611 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
613 if (INODE_VERSION(inode) == MINIX_V1)
614 V1_minix_truncate(inode);
616 V2_minix_truncate(inode);
619 static int minix_get_sb(struct file_system_type *fs_type,
620 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
622 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
626 static struct file_system_type minix_fs_type = {
627 .owner = THIS_MODULE,
629 .get_sb = minix_get_sb,
630 .kill_sb = kill_block_super,
631 .fs_flags = FS_REQUIRES_DEV,
634 static int __init init_minix_fs(void)
636 int err = init_inodecache();
639 err = register_filesystem(&minix_fs_type);
644 destroy_inodecache();
649 static void __exit exit_minix_fs(void)
651 unregister_filesystem(&minix_fs_type);
652 destroy_inodecache();
655 module_init(init_minix_fs)
656 module_exit(exit_minix_fs)
657 MODULE_LICENSE("GPL");