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 kmem_cache_free(minix_inode_cachep, minix_i(inode));
77 static void minix_destroy_inode(struct inode *inode)
79 call_rcu(&inode->i_rcu, minix_i_callback);
82 static void init_once(void *foo)
84 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
86 inode_init_once(&ei->vfs_inode);
89 static int init_inodecache(void)
91 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info),
93 0, (SLAB_RECLAIM_ACCOUNT|
96 if (minix_inode_cachep == NULL)
101 static void destroy_inodecache(void)
104 * Make sure all delayed rcu free inodes are flushed before we
108 kmem_cache_destroy(minix_inode_cachep);
111 static const struct super_operations minix_sops = {
112 .alloc_inode = minix_alloc_inode,
113 .destroy_inode = minix_destroy_inode,
114 .write_inode = minix_write_inode,
115 .evict_inode = minix_evict_inode,
116 .put_super = minix_put_super,
117 .statfs = minix_statfs,
118 .remount_fs = minix_remount,
121 static int minix_remount (struct super_block * sb, int * flags, char * data)
123 struct minix_sb_info * sbi = minix_sb(sb);
124 struct minix_super_block * ms;
127 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
129 if (*flags & MS_RDONLY) {
130 if (ms->s_state & MINIX_VALID_FS ||
131 !(sbi->s_mount_state & MINIX_VALID_FS))
133 /* Mounting a rw partition read-only. */
134 if (sbi->s_version != MINIX_V3)
135 ms->s_state = sbi->s_mount_state;
136 mark_buffer_dirty(sbi->s_sbh);
138 /* Mount a partition which is read-only, read-write. */
139 if (sbi->s_version != MINIX_V3) {
140 sbi->s_mount_state = ms->s_state;
141 ms->s_state &= ~MINIX_VALID_FS;
143 sbi->s_mount_state = MINIX_VALID_FS;
145 mark_buffer_dirty(sbi->s_sbh);
147 if (!(sbi->s_mount_state & MINIX_VALID_FS))
148 printk("MINIX-fs warning: remounting unchecked fs, "
149 "running fsck is recommended\n");
150 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
151 printk("MINIX-fs warning: remounting fs with errors, "
152 "running fsck is recommended\n");
157 static int minix_fill_super(struct super_block *s, void *data, int silent)
159 struct buffer_head *bh;
160 struct buffer_head **map;
161 struct minix_super_block *ms;
162 struct minix3_super_block *m3s = NULL;
163 unsigned long i, block;
164 struct inode *root_inode;
165 struct minix_sb_info *sbi;
168 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
173 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
174 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
176 if (!sb_set_blocksize(s, BLOCK_SIZE))
179 if (!(bh = sb_bread(s, 1)))
182 ms = (struct minix_super_block *) bh->b_data;
185 sbi->s_mount_state = ms->s_state;
186 sbi->s_ninodes = ms->s_ninodes;
187 sbi->s_nzones = ms->s_nzones;
188 sbi->s_imap_blocks = ms->s_imap_blocks;
189 sbi->s_zmap_blocks = ms->s_zmap_blocks;
190 sbi->s_firstdatazone = ms->s_firstdatazone;
191 sbi->s_log_zone_size = ms->s_log_zone_size;
192 sbi->s_max_size = ms->s_max_size;
193 s->s_magic = ms->s_magic;
194 if (s->s_magic == MINIX_SUPER_MAGIC) {
195 sbi->s_version = MINIX_V1;
198 s->s_max_links = MINIX_LINK_MAX;
199 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
200 sbi->s_version = MINIX_V1;
203 s->s_max_links = MINIX_LINK_MAX;
204 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
205 sbi->s_version = MINIX_V2;
206 sbi->s_nzones = ms->s_zones;
209 s->s_max_links = MINIX2_LINK_MAX;
210 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
211 sbi->s_version = MINIX_V2;
212 sbi->s_nzones = ms->s_zones;
215 s->s_max_links = MINIX2_LINK_MAX;
216 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
217 m3s = (struct minix3_super_block *) bh->b_data;
218 s->s_magic = m3s->s_magic;
219 sbi->s_imap_blocks = m3s->s_imap_blocks;
220 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
221 sbi->s_firstdatazone = m3s->s_firstdatazone;
222 sbi->s_log_zone_size = m3s->s_log_zone_size;
223 sbi->s_max_size = m3s->s_max_size;
224 sbi->s_ninodes = m3s->s_ninodes;
225 sbi->s_nzones = m3s->s_zones;
228 sbi->s_version = MINIX_V3;
229 sbi->s_mount_state = MINIX_VALID_FS;
230 sb_set_blocksize(s, m3s->s_blocksize);
231 s->s_max_links = MINIX2_LINK_MAX;
236 * Allocate the buffer map to keep the superblock small.
238 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
240 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
241 map = kzalloc(i, GFP_KERNEL);
244 sbi->s_imap = &map[0];
245 sbi->s_zmap = &map[sbi->s_imap_blocks];
248 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
249 if (!(sbi->s_imap[i]=sb_bread(s, block)))
253 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
254 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
259 minix_set_bit(0,sbi->s_imap[0]->b_data);
260 minix_set_bit(0,sbi->s_zmap[0]->b_data);
262 /* Apparently minix can create filesystems that allocate more blocks for
263 * the bitmaps than needed. We simply ignore that, but verify it didn't
264 * create one with not enough blocks and bail out if so.
266 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
267 if (sbi->s_imap_blocks < block) {
268 printk("MINIX-fs: file system does not have enough "
269 "imap blocks allocated. Refusing to mount\n");
273 block = minix_blocks_needed(
274 (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
276 if (sbi->s_zmap_blocks < block) {
277 printk("MINIX-fs: file system does not have enough "
278 "zmap blocks allocated. Refusing to mount.\n");
282 /* set up enough so that it can read an inode */
283 s->s_op = &minix_sops;
284 root_inode = minix_iget(s, MINIX_ROOT_INO);
285 if (IS_ERR(root_inode)) {
286 ret = PTR_ERR(root_inode);
291 s->s_root = d_make_root(root_inode);
295 if (!(s->s_flags & MS_RDONLY)) {
296 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
297 ms->s_state &= ~MINIX_VALID_FS;
298 mark_buffer_dirty(bh);
300 if (!(sbi->s_mount_state & MINIX_VALID_FS))
301 printk("MINIX-fs: mounting unchecked file system, "
302 "running fsck is recommended\n");
303 else if (sbi->s_mount_state & MINIX_ERROR_FS)
304 printk("MINIX-fs: mounting file system with errors, "
305 "running fsck is recommended\n");
311 printk("MINIX-fs: get root inode failed\n");
315 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
317 for (i = 0; i < sbi->s_imap_blocks; i++)
318 brelse(sbi->s_imap[i]);
319 for (i = 0; i < sbi->s_zmap_blocks; i++)
320 brelse(sbi->s_zmap[i]);
327 printk("MINIX-fs: can't allocate map\n");
332 printk("MINIX-fs: bad superblock\n");
337 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
338 "on device %s.\n", s->s_id);
344 printk("MINIX-fs: blocksize too small for device\n");
348 printk("MINIX-fs: unable to read superblock\n");
355 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
357 struct super_block *sb = dentry->d_sb;
358 struct minix_sb_info *sbi = minix_sb(sb);
359 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
360 buf->f_type = sb->s_magic;
361 buf->f_bsize = sb->s_blocksize;
362 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
363 buf->f_bfree = minix_count_free_blocks(sb);
364 buf->f_bavail = buf->f_bfree;
365 buf->f_files = sbi->s_ninodes;
366 buf->f_ffree = minix_count_free_inodes(sb);
367 buf->f_namelen = sbi->s_namelen;
368 buf->f_fsid.val[0] = (u32)id;
369 buf->f_fsid.val[1] = (u32)(id >> 32);
374 static int minix_get_block(struct inode *inode, sector_t block,
375 struct buffer_head *bh_result, int create)
377 if (INODE_VERSION(inode) == MINIX_V1)
378 return V1_minix_get_block(inode, block, bh_result, create);
380 return V2_minix_get_block(inode, block, bh_result, create);
383 static int minix_writepage(struct page *page, struct writeback_control *wbc)
385 return block_write_full_page(page, minix_get_block, wbc);
388 static int minix_readpage(struct file *file, struct page *page)
390 return block_read_full_page(page,minix_get_block);
393 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
395 return __block_write_begin(page, pos, len, minix_get_block);
398 static void minix_write_failed(struct address_space *mapping, loff_t to)
400 struct inode *inode = mapping->host;
402 if (to > inode->i_size) {
403 truncate_pagecache(inode, to, inode->i_size);
404 minix_truncate(inode);
408 static int minix_write_begin(struct file *file, struct address_space *mapping,
409 loff_t pos, unsigned len, unsigned flags,
410 struct page **pagep, void **fsdata)
414 ret = block_write_begin(mapping, pos, len, flags, pagep,
417 minix_write_failed(mapping, pos + len);
422 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
424 return generic_block_bmap(mapping,block,minix_get_block);
427 static const struct address_space_operations minix_aops = {
428 .readpage = minix_readpage,
429 .writepage = minix_writepage,
430 .write_begin = minix_write_begin,
431 .write_end = generic_write_end,
435 static const struct inode_operations minix_symlink_inode_operations = {
436 .readlink = generic_readlink,
437 .follow_link = page_follow_link_light,
438 .put_link = page_put_link,
439 .getattr = minix_getattr,
442 void minix_set_inode(struct inode *inode, dev_t rdev)
444 if (S_ISREG(inode->i_mode)) {
445 inode->i_op = &minix_file_inode_operations;
446 inode->i_fop = &minix_file_operations;
447 inode->i_mapping->a_ops = &minix_aops;
448 } else if (S_ISDIR(inode->i_mode)) {
449 inode->i_op = &minix_dir_inode_operations;
450 inode->i_fop = &minix_dir_operations;
451 inode->i_mapping->a_ops = &minix_aops;
452 } else if (S_ISLNK(inode->i_mode)) {
453 inode->i_op = &minix_symlink_inode_operations;
454 inode->i_mapping->a_ops = &minix_aops;
456 init_special_inode(inode, inode->i_mode, rdev);
460 * The minix V1 function to read an inode.
462 static struct inode *V1_minix_iget(struct inode *inode)
464 struct buffer_head * bh;
465 struct minix_inode * raw_inode;
466 struct minix_inode_info *minix_inode = minix_i(inode);
469 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
472 return ERR_PTR(-EIO);
474 inode->i_mode = raw_inode->i_mode;
475 i_uid_write(inode, raw_inode->i_uid);
476 i_gid_write(inode, raw_inode->i_gid);
477 set_nlink(inode, raw_inode->i_nlinks);
478 inode->i_size = raw_inode->i_size;
479 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
480 inode->i_mtime.tv_nsec = 0;
481 inode->i_atime.tv_nsec = 0;
482 inode->i_ctime.tv_nsec = 0;
484 for (i = 0; i < 9; i++)
485 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
486 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
488 unlock_new_inode(inode);
493 * The minix V2 function to read an inode.
495 static struct inode *V2_minix_iget(struct inode *inode)
497 struct buffer_head * bh;
498 struct minix2_inode * raw_inode;
499 struct minix_inode_info *minix_inode = minix_i(inode);
502 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
505 return ERR_PTR(-EIO);
507 inode->i_mode = raw_inode->i_mode;
508 i_uid_write(inode, raw_inode->i_uid);
509 i_gid_write(inode, raw_inode->i_gid);
510 set_nlink(inode, raw_inode->i_nlinks);
511 inode->i_size = raw_inode->i_size;
512 inode->i_mtime.tv_sec = raw_inode->i_mtime;
513 inode->i_atime.tv_sec = raw_inode->i_atime;
514 inode->i_ctime.tv_sec = raw_inode->i_ctime;
515 inode->i_mtime.tv_nsec = 0;
516 inode->i_atime.tv_nsec = 0;
517 inode->i_ctime.tv_nsec = 0;
519 for (i = 0; i < 10; i++)
520 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
521 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
523 unlock_new_inode(inode);
528 * The global function to read an inode.
530 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
534 inode = iget_locked(sb, ino);
536 return ERR_PTR(-ENOMEM);
537 if (!(inode->i_state & I_NEW))
540 if (INODE_VERSION(inode) == MINIX_V1)
541 return V1_minix_iget(inode);
543 return V2_minix_iget(inode);
547 * The minix V1 function to synchronize an inode.
549 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
551 struct buffer_head * bh;
552 struct minix_inode * raw_inode;
553 struct minix_inode_info *minix_inode = minix_i(inode);
556 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
559 raw_inode->i_mode = inode->i_mode;
560 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
561 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
562 raw_inode->i_nlinks = inode->i_nlink;
563 raw_inode->i_size = inode->i_size;
564 raw_inode->i_time = inode->i_mtime.tv_sec;
565 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
566 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
567 else for (i = 0; i < 9; i++)
568 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
569 mark_buffer_dirty(bh);
574 * The minix V2 function to synchronize an inode.
576 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
578 struct buffer_head * bh;
579 struct minix2_inode * raw_inode;
580 struct minix_inode_info *minix_inode = minix_i(inode);
583 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
586 raw_inode->i_mode = inode->i_mode;
587 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
588 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
589 raw_inode->i_nlinks = inode->i_nlink;
590 raw_inode->i_size = inode->i_size;
591 raw_inode->i_mtime = inode->i_mtime.tv_sec;
592 raw_inode->i_atime = inode->i_atime.tv_sec;
593 raw_inode->i_ctime = inode->i_ctime.tv_sec;
594 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
595 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
596 else for (i = 0; i < 10; i++)
597 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
598 mark_buffer_dirty(bh);
602 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
605 struct buffer_head *bh;
607 if (INODE_VERSION(inode) == MINIX_V1)
608 bh = V1_minix_update_inode(inode);
610 bh = V2_minix_update_inode(inode);
613 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
614 sync_dirty_buffer(bh);
615 if (buffer_req(bh) && !buffer_uptodate(bh)) {
616 printk("IO error syncing minix inode [%s:%08lx]\n",
617 inode->i_sb->s_id, inode->i_ino);
625 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
627 struct super_block *sb = dentry->d_sb;
628 generic_fillattr(dentry->d_inode, stat);
629 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
630 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
632 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
633 stat->blksize = sb->s_blocksize;
638 * The function that is called for file truncation.
640 void minix_truncate(struct inode * inode)
642 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
644 if (INODE_VERSION(inode) == MINIX_V1)
645 V1_minix_truncate(inode);
647 V2_minix_truncate(inode);
650 static struct dentry *minix_mount(struct file_system_type *fs_type,
651 int flags, const char *dev_name, void *data)
653 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
656 static struct file_system_type minix_fs_type = {
657 .owner = THIS_MODULE,
659 .mount = minix_mount,
660 .kill_sb = kill_block_super,
661 .fs_flags = FS_REQUIRES_DEV,
664 static int __init init_minix_fs(void)
666 int err = init_inodecache();
669 err = register_filesystem(&minix_fs_type);
674 destroy_inodecache();
679 static void __exit exit_minix_fs(void)
681 unregister_filesystem(&minix_fs_type);
682 destroy_inodecache();
685 module_init(init_minix_fs)
686 module_exit(exit_minix_fs)
687 MODULE_LICENSE("GPL");