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>
20 #include <linux/writeback.h>
22 static int minix_write_inode(struct inode *inode,
23 struct writeback_control *wbc);
24 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
25 static int minix_remount (struct super_block * sb, int * flags, char * data);
27 static void minix_evict_inode(struct inode *inode)
29 truncate_inode_pages(&inode->i_data, 0);
30 if (!inode->i_nlink) {
32 minix_truncate(inode);
34 invalidate_inode_buffers(inode);
37 minix_free_inode(inode);
40 static void minix_put_super(struct super_block *sb)
43 struct minix_sb_info *sbi = minix_sb(sb);
45 if (!(sb->s_flags & MS_RDONLY)) {
46 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
47 sbi->s_ms->s_state = sbi->s_mount_state;
48 mark_buffer_dirty(sbi->s_sbh);
50 for (i = 0; i < sbi->s_imap_blocks; i++)
51 brelse(sbi->s_imap[i]);
52 for (i = 0; i < sbi->s_zmap_blocks; i++)
53 brelse(sbi->s_zmap[i]);
60 static struct kmem_cache * minix_inode_cachep;
62 static struct inode *minix_alloc_inode(struct super_block *sb)
64 struct minix_inode_info *ei;
65 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
68 return &ei->vfs_inode;
71 static void minix_i_callback(struct rcu_head *head)
73 struct inode *inode = container_of(head, struct inode, i_rcu);
74 INIT_LIST_HEAD(&inode->i_dentry);
75 kmem_cache_free(minix_inode_cachep, minix_i(inode));
78 static void minix_destroy_inode(struct inode *inode)
80 call_rcu(&inode->i_rcu, minix_i_callback);
83 static void init_once(void *foo)
85 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
87 inode_init_once(&ei->vfs_inode);
90 static int init_inodecache(void)
92 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
93 sizeof(struct minix_inode_info),
94 0, (SLAB_RECLAIM_ACCOUNT|
97 if (minix_inode_cachep == NULL)
102 static void destroy_inodecache(void)
104 kmem_cache_destroy(minix_inode_cachep);
107 static const struct super_operations minix_sops = {
108 .alloc_inode = minix_alloc_inode,
109 .destroy_inode = minix_destroy_inode,
110 .write_inode = minix_write_inode,
111 .evict_inode = minix_evict_inode,
112 .put_super = minix_put_super,
113 .statfs = minix_statfs,
114 .remount_fs = minix_remount,
117 static int minix_remount (struct super_block * sb, int * flags, char * data)
119 struct minix_sb_info * sbi = minix_sb(sb);
120 struct minix_super_block * ms;
123 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
125 if (*flags & MS_RDONLY) {
126 if (ms->s_state & MINIX_VALID_FS ||
127 !(sbi->s_mount_state & MINIX_VALID_FS))
129 /* Mounting a rw partition read-only. */
130 if (sbi->s_version != MINIX_V3)
131 ms->s_state = sbi->s_mount_state;
132 mark_buffer_dirty(sbi->s_sbh);
134 /* Mount a partition which is read-only, read-write. */
135 if (sbi->s_version != MINIX_V3) {
136 sbi->s_mount_state = ms->s_state;
137 ms->s_state &= ~MINIX_VALID_FS;
139 sbi->s_mount_state = MINIX_VALID_FS;
141 mark_buffer_dirty(sbi->s_sbh);
143 if (!(sbi->s_mount_state & MINIX_VALID_FS))
144 printk("MINIX-fs warning: remounting unchecked fs, "
145 "running fsck is recommended\n");
146 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
147 printk("MINIX-fs warning: remounting fs with errors, "
148 "running fsck is recommended\n");
153 static int minix_fill_super(struct super_block *s, void *data, int silent)
155 struct buffer_head *bh;
156 struct buffer_head **map;
157 struct minix_super_block *ms;
158 struct minix3_super_block *m3s = NULL;
159 unsigned long i, block;
160 struct inode *root_inode;
161 struct minix_sb_info *sbi;
164 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
169 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
170 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
172 if (!sb_set_blocksize(s, BLOCK_SIZE))
175 if (!(bh = sb_bread(s, 1)))
178 ms = (struct minix_super_block *) bh->b_data;
181 sbi->s_mount_state = ms->s_state;
182 sbi->s_ninodes = ms->s_ninodes;
183 sbi->s_nzones = ms->s_nzones;
184 sbi->s_imap_blocks = ms->s_imap_blocks;
185 sbi->s_zmap_blocks = ms->s_zmap_blocks;
186 sbi->s_firstdatazone = ms->s_firstdatazone;
187 sbi->s_log_zone_size = ms->s_log_zone_size;
188 sbi->s_max_size = ms->s_max_size;
189 s->s_magic = ms->s_magic;
190 if (s->s_magic == MINIX_SUPER_MAGIC) {
191 sbi->s_version = MINIX_V1;
194 sbi->s_link_max = MINIX_LINK_MAX;
195 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V1;
199 sbi->s_link_max = MINIX_LINK_MAX;
200 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
201 sbi->s_version = MINIX_V2;
202 sbi->s_nzones = ms->s_zones;
205 sbi->s_link_max = MINIX2_LINK_MAX;
206 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
207 sbi->s_version = MINIX_V2;
208 sbi->s_nzones = ms->s_zones;
211 sbi->s_link_max = MINIX2_LINK_MAX;
212 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
213 m3s = (struct minix3_super_block *) bh->b_data;
214 s->s_magic = m3s->s_magic;
215 sbi->s_imap_blocks = m3s->s_imap_blocks;
216 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
217 sbi->s_firstdatazone = m3s->s_firstdatazone;
218 sbi->s_log_zone_size = m3s->s_log_zone_size;
219 sbi->s_max_size = m3s->s_max_size;
220 sbi->s_ninodes = m3s->s_ninodes;
221 sbi->s_nzones = m3s->s_zones;
224 sbi->s_version = MINIX_V3;
225 sbi->s_link_max = MINIX2_LINK_MAX;
226 sbi->s_mount_state = MINIX_VALID_FS;
227 sb_set_blocksize(s, m3s->s_blocksize);
232 * Allocate the buffer map to keep the superblock small.
234 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
236 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
237 map = kzalloc(i, GFP_KERNEL);
240 sbi->s_imap = &map[0];
241 sbi->s_zmap = &map[sbi->s_imap_blocks];
244 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
245 if (!(sbi->s_imap[i]=sb_bread(s, block)))
249 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
250 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
255 minix_set_bit(0,sbi->s_imap[0]->b_data);
256 minix_set_bit(0,sbi->s_zmap[0]->b_data);
258 /* set up enough so that it can read an inode */
259 s->s_op = &minix_sops;
260 root_inode = minix_iget(s, MINIX_ROOT_INO);
261 if (IS_ERR(root_inode)) {
262 ret = PTR_ERR(root_inode);
267 s->s_root = d_alloc_root(root_inode);
271 if (!(s->s_flags & MS_RDONLY)) {
272 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
273 ms->s_state &= ~MINIX_VALID_FS;
274 mark_buffer_dirty(bh);
276 if (!(sbi->s_mount_state & MINIX_VALID_FS))
277 printk("MINIX-fs: mounting unchecked file system, "
278 "running fsck is recommended\n");
279 else if (sbi->s_mount_state & MINIX_ERROR_FS)
280 printk("MINIX-fs: mounting file system with errors, "
281 "running fsck is recommended\n");
290 printk("MINIX-fs: get root inode failed\n");
294 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
296 for (i = 0; i < sbi->s_imap_blocks; i++)
297 brelse(sbi->s_imap[i]);
298 for (i = 0; i < sbi->s_zmap_blocks; i++)
299 brelse(sbi->s_zmap[i]);
306 printk("MINIX-fs: can't allocate map\n");
311 printk("MINIX-fs: bad superblock\n");
316 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
317 "on device %s.\n", s->s_id);
323 printk("MINIX-fs: blocksize too small for device\n");
327 printk("MINIX-fs: unable to read superblock\n");
334 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
336 struct super_block *sb = dentry->d_sb;
337 struct minix_sb_info *sbi = minix_sb(sb);
338 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
339 buf->f_type = sb->s_magic;
340 buf->f_bsize = sb->s_blocksize;
341 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
342 buf->f_bfree = minix_count_free_blocks(sbi);
343 buf->f_bavail = buf->f_bfree;
344 buf->f_files = sbi->s_ninodes;
345 buf->f_ffree = minix_count_free_inodes(sbi);
346 buf->f_namelen = sbi->s_namelen;
347 buf->f_fsid.val[0] = (u32)id;
348 buf->f_fsid.val[1] = (u32)(id >> 32);
353 static int minix_get_block(struct inode *inode, sector_t block,
354 struct buffer_head *bh_result, int create)
356 if (INODE_VERSION(inode) == MINIX_V1)
357 return V1_minix_get_block(inode, block, bh_result, create);
359 return V2_minix_get_block(inode, block, bh_result, create);
362 static int minix_writepage(struct page *page, struct writeback_control *wbc)
364 return block_write_full_page(page, minix_get_block, wbc);
367 static int minix_readpage(struct file *file, struct page *page)
369 return block_read_full_page(page,minix_get_block);
372 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
374 return __block_write_begin(page, pos, len, minix_get_block);
377 static int minix_write_begin(struct file *file, struct address_space *mapping,
378 loff_t pos, unsigned len, unsigned flags,
379 struct page **pagep, void **fsdata)
383 ret = block_write_begin(mapping, pos, len, flags, pagep,
386 loff_t isize = mapping->host->i_size;
387 if (pos + len > isize)
388 vmtruncate(mapping->host, isize);
394 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
396 return generic_block_bmap(mapping,block,minix_get_block);
399 static const struct address_space_operations minix_aops = {
400 .readpage = minix_readpage,
401 .writepage = minix_writepage,
402 .write_begin = minix_write_begin,
403 .write_end = generic_write_end,
407 static const struct inode_operations minix_symlink_inode_operations = {
408 .readlink = generic_readlink,
409 .follow_link = page_follow_link_light,
410 .put_link = page_put_link,
411 .getattr = minix_getattr,
414 void minix_set_inode(struct inode *inode, dev_t rdev)
416 if (S_ISREG(inode->i_mode)) {
417 inode->i_op = &minix_file_inode_operations;
418 inode->i_fop = &minix_file_operations;
419 inode->i_mapping->a_ops = &minix_aops;
420 } else if (S_ISDIR(inode->i_mode)) {
421 inode->i_op = &minix_dir_inode_operations;
422 inode->i_fop = &minix_dir_operations;
423 inode->i_mapping->a_ops = &minix_aops;
424 } else if (S_ISLNK(inode->i_mode)) {
425 inode->i_op = &minix_symlink_inode_operations;
426 inode->i_mapping->a_ops = &minix_aops;
428 init_special_inode(inode, inode->i_mode, rdev);
432 * The minix V1 function to read an inode.
434 static struct inode *V1_minix_iget(struct inode *inode)
436 struct buffer_head * bh;
437 struct minix_inode * raw_inode;
438 struct minix_inode_info *minix_inode = minix_i(inode);
441 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
444 return ERR_PTR(-EIO);
446 inode->i_mode = raw_inode->i_mode;
447 inode->i_uid = (uid_t)raw_inode->i_uid;
448 inode->i_gid = (gid_t)raw_inode->i_gid;
449 inode->i_nlink = raw_inode->i_nlinks;
450 inode->i_size = raw_inode->i_size;
451 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
452 inode->i_mtime.tv_nsec = 0;
453 inode->i_atime.tv_nsec = 0;
454 inode->i_ctime.tv_nsec = 0;
456 for (i = 0; i < 9; i++)
457 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
458 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
460 unlock_new_inode(inode);
465 * The minix V2 function to read an inode.
467 static struct inode *V2_minix_iget(struct inode *inode)
469 struct buffer_head * bh;
470 struct minix2_inode * raw_inode;
471 struct minix_inode_info *minix_inode = minix_i(inode);
474 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
477 return ERR_PTR(-EIO);
479 inode->i_mode = raw_inode->i_mode;
480 inode->i_uid = (uid_t)raw_inode->i_uid;
481 inode->i_gid = (gid_t)raw_inode->i_gid;
482 inode->i_nlink = raw_inode->i_nlinks;
483 inode->i_size = raw_inode->i_size;
484 inode->i_mtime.tv_sec = raw_inode->i_mtime;
485 inode->i_atime.tv_sec = raw_inode->i_atime;
486 inode->i_ctime.tv_sec = raw_inode->i_ctime;
487 inode->i_mtime.tv_nsec = 0;
488 inode->i_atime.tv_nsec = 0;
489 inode->i_ctime.tv_nsec = 0;
491 for (i = 0; i < 10; i++)
492 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
493 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
495 unlock_new_inode(inode);
500 * The global function to read an inode.
502 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
506 inode = iget_locked(sb, ino);
508 return ERR_PTR(-ENOMEM);
509 if (!(inode->i_state & I_NEW))
512 if (INODE_VERSION(inode) == MINIX_V1)
513 return V1_minix_iget(inode);
515 return V2_minix_iget(inode);
519 * The minix V1 function to synchronize an inode.
521 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
523 struct buffer_head * bh;
524 struct minix_inode * raw_inode;
525 struct minix_inode_info *minix_inode = minix_i(inode);
528 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
531 raw_inode->i_mode = inode->i_mode;
532 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
533 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
534 raw_inode->i_nlinks = inode->i_nlink;
535 raw_inode->i_size = inode->i_size;
536 raw_inode->i_time = inode->i_mtime.tv_sec;
537 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
538 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
539 else for (i = 0; i < 9; i++)
540 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
541 mark_buffer_dirty(bh);
546 * The minix V2 function to synchronize an inode.
548 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
550 struct buffer_head * bh;
551 struct minix2_inode * raw_inode;
552 struct minix_inode_info *minix_inode = minix_i(inode);
555 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
558 raw_inode->i_mode = inode->i_mode;
559 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
560 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
561 raw_inode->i_nlinks = inode->i_nlink;
562 raw_inode->i_size = inode->i_size;
563 raw_inode->i_mtime = inode->i_mtime.tv_sec;
564 raw_inode->i_atime = inode->i_atime.tv_sec;
565 raw_inode->i_ctime = inode->i_ctime.tv_sec;
566 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
567 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
568 else for (i = 0; i < 10; i++)
569 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
570 mark_buffer_dirty(bh);
574 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
577 struct buffer_head *bh;
579 if (INODE_VERSION(inode) == MINIX_V1)
580 bh = V1_minix_update_inode(inode);
582 bh = V2_minix_update_inode(inode);
585 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
586 sync_dirty_buffer(bh);
587 if (buffer_req(bh) && !buffer_uptodate(bh)) {
588 printk("IO error syncing minix inode [%s:%08lx]\n",
589 inode->i_sb->s_id, inode->i_ino);
597 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
599 struct super_block *sb = dentry->d_sb;
600 generic_fillattr(dentry->d_inode, stat);
601 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
602 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
604 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
605 stat->blksize = sb->s_blocksize;
610 * The function that is called for file truncation.
612 void minix_truncate(struct inode * inode)
614 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
616 if (INODE_VERSION(inode) == MINIX_V1)
617 V1_minix_truncate(inode);
619 V2_minix_truncate(inode);
622 static struct dentry *minix_mount(struct file_system_type *fs_type,
623 int flags, const char *dev_name, void *data)
625 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
628 static struct file_system_type minix_fs_type = {
629 .owner = THIS_MODULE,
631 .mount = minix_mount,
632 .kill_sb = kill_block_super,
633 .fs_flags = FS_REQUIRES_DEV,
636 static int __init init_minix_fs(void)
638 int err = init_inodecache();
641 err = register_filesystem(&minix_fs_type);
646 destroy_inodecache();
651 static void __exit exit_minix_fs(void)
653 unregister_filesystem(&minix_fs_type);
654 destroy_inodecache();
657 module_init(init_minix_fs)
658 module_exit(exit_minix_fs)
659 MODULE_LICENSE("GPL");