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_final(&inode->i_data);
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 = 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 init_inodecache(void)
91 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info),
93 0, (SLAB_RECLAIM_ACCOUNT|
94 SLAB_MEM_SPREAD|SLAB_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;
128 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
130 if (*flags & MS_RDONLY) {
131 if (ms->s_state & MINIX_VALID_FS ||
132 !(sbi->s_mount_state & MINIX_VALID_FS))
134 /* Mounting a rw partition read-only. */
135 if (sbi->s_version != MINIX_V3)
136 ms->s_state = sbi->s_mount_state;
137 mark_buffer_dirty(sbi->s_sbh);
139 /* Mount a partition which is read-only, read-write. */
140 if (sbi->s_version != MINIX_V3) {
141 sbi->s_mount_state = ms->s_state;
142 ms->s_state &= ~MINIX_VALID_FS;
144 sbi->s_mount_state = MINIX_VALID_FS;
146 mark_buffer_dirty(sbi->s_sbh);
148 if (!(sbi->s_mount_state & MINIX_VALID_FS))
149 printk("MINIX-fs warning: remounting unchecked fs, "
150 "running fsck is recommended\n");
151 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
152 printk("MINIX-fs warning: remounting fs with errors, "
153 "running fsck is recommended\n");
158 static bool minix_check_superblock(struct minix_sb_info *sbi)
160 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
164 * s_max_size must not exceed the block mapping limitation. This check
165 * is only needed for V1 filesystems, since V2/V3 support an extra level
166 * of indirect blocks which places the limit well above U32_MAX.
168 if (sbi->s_version == MINIX_V1 &&
169 sbi->s_max_size > (7 + 512 + 512*512) * BLOCK_SIZE)
175 static int minix_fill_super(struct super_block *s, void *data, int silent)
177 struct buffer_head *bh;
178 struct buffer_head **map;
179 struct minix_super_block *ms;
180 struct minix3_super_block *m3s = NULL;
181 unsigned long i, block;
182 struct inode *root_inode;
183 struct minix_sb_info *sbi;
186 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
191 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
192 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
194 if (!sb_set_blocksize(s, BLOCK_SIZE))
197 if (!(bh = sb_bread(s, 1)))
200 ms = (struct minix_super_block *) bh->b_data;
203 sbi->s_mount_state = ms->s_state;
204 sbi->s_ninodes = ms->s_ninodes;
205 sbi->s_nzones = ms->s_nzones;
206 sbi->s_imap_blocks = ms->s_imap_blocks;
207 sbi->s_zmap_blocks = ms->s_zmap_blocks;
208 sbi->s_firstdatazone = ms->s_firstdatazone;
209 sbi->s_log_zone_size = ms->s_log_zone_size;
210 sbi->s_max_size = ms->s_max_size;
211 s->s_magic = ms->s_magic;
212 if (s->s_magic == MINIX_SUPER_MAGIC) {
213 sbi->s_version = MINIX_V1;
216 s->s_max_links = MINIX_LINK_MAX;
217 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
218 sbi->s_version = MINIX_V1;
221 s->s_max_links = MINIX_LINK_MAX;
222 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
223 sbi->s_version = MINIX_V2;
224 sbi->s_nzones = ms->s_zones;
227 s->s_max_links = MINIX2_LINK_MAX;
228 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
229 sbi->s_version = MINIX_V2;
230 sbi->s_nzones = ms->s_zones;
233 s->s_max_links = MINIX2_LINK_MAX;
234 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
235 m3s = (struct minix3_super_block *) bh->b_data;
236 s->s_magic = m3s->s_magic;
237 sbi->s_imap_blocks = m3s->s_imap_blocks;
238 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
239 sbi->s_firstdatazone = m3s->s_firstdatazone;
240 sbi->s_log_zone_size = m3s->s_log_zone_size;
241 sbi->s_max_size = m3s->s_max_size;
242 sbi->s_ninodes = m3s->s_ninodes;
243 sbi->s_nzones = m3s->s_zones;
246 sbi->s_version = MINIX_V3;
247 sbi->s_mount_state = MINIX_VALID_FS;
248 sb_set_blocksize(s, m3s->s_blocksize);
249 s->s_max_links = MINIX2_LINK_MAX;
253 if (!minix_check_superblock(sbi))
257 * Allocate the buffer map to keep the superblock small.
259 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
260 map = kzalloc(i, GFP_KERNEL);
263 sbi->s_imap = &map[0];
264 sbi->s_zmap = &map[sbi->s_imap_blocks];
267 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
268 if (!(sbi->s_imap[i]=sb_bread(s, block)))
272 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
273 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
278 minix_set_bit(0,sbi->s_imap[0]->b_data);
279 minix_set_bit(0,sbi->s_zmap[0]->b_data);
281 /* Apparently minix can create filesystems that allocate more blocks for
282 * the bitmaps than needed. We simply ignore that, but verify it didn't
283 * create one with not enough blocks and bail out if so.
285 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
286 if (sbi->s_imap_blocks < block) {
287 printk("MINIX-fs: file system does not have enough "
288 "imap blocks allocated. Refusing to mount.\n");
292 block = minix_blocks_needed(
293 (sbi->s_nzones - sbi->s_firstdatazone + 1),
295 if (sbi->s_zmap_blocks < block) {
296 printk("MINIX-fs: file system does not have enough "
297 "zmap blocks allocated. Refusing to mount.\n");
301 /* set up enough so that it can read an inode */
302 s->s_op = &minix_sops;
303 root_inode = minix_iget(s, MINIX_ROOT_INO);
304 if (IS_ERR(root_inode)) {
305 ret = PTR_ERR(root_inode);
310 s->s_root = d_make_root(root_inode);
314 if (!(s->s_flags & MS_RDONLY)) {
315 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
316 ms->s_state &= ~MINIX_VALID_FS;
317 mark_buffer_dirty(bh);
319 if (!(sbi->s_mount_state & MINIX_VALID_FS))
320 printk("MINIX-fs: mounting unchecked file system, "
321 "running fsck is recommended\n");
322 else if (sbi->s_mount_state & MINIX_ERROR_FS)
323 printk("MINIX-fs: mounting file system with errors, "
324 "running fsck is recommended\n");
330 printk("MINIX-fs: get root inode failed\n");
334 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
336 for (i = 0; i < sbi->s_imap_blocks; i++)
337 brelse(sbi->s_imap[i]);
338 for (i = 0; i < sbi->s_zmap_blocks; i++)
339 brelse(sbi->s_zmap[i]);
346 printk("MINIX-fs: can't allocate map\n");
351 printk("MINIX-fs: bad superblock\n");
356 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
357 "on device %s.\n", s->s_id);
363 printk("MINIX-fs: blocksize too small for device\n");
367 printk("MINIX-fs: unable to read superblock\n");
374 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
376 struct super_block *sb = dentry->d_sb;
377 struct minix_sb_info *sbi = minix_sb(sb);
378 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
379 buf->f_type = sb->s_magic;
380 buf->f_bsize = sb->s_blocksize;
381 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
382 buf->f_bfree = minix_count_free_blocks(sb);
383 buf->f_bavail = buf->f_bfree;
384 buf->f_files = sbi->s_ninodes;
385 buf->f_ffree = minix_count_free_inodes(sb);
386 buf->f_namelen = sbi->s_namelen;
387 buf->f_fsid.val[0] = (u32)id;
388 buf->f_fsid.val[1] = (u32)(id >> 32);
393 static int minix_get_block(struct inode *inode, sector_t block,
394 struct buffer_head *bh_result, int create)
396 if (INODE_VERSION(inode) == MINIX_V1)
397 return V1_minix_get_block(inode, block, bh_result, create);
399 return V2_minix_get_block(inode, block, bh_result, create);
402 static int minix_writepage(struct page *page, struct writeback_control *wbc)
404 return block_write_full_page(page, minix_get_block, wbc);
407 static int minix_readpage(struct file *file, struct page *page)
409 return block_read_full_page(page,minix_get_block);
412 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
414 return __block_write_begin(page, pos, len, minix_get_block);
417 static void minix_write_failed(struct address_space *mapping, loff_t to)
419 struct inode *inode = mapping->host;
421 if (to > inode->i_size) {
422 truncate_pagecache(inode, inode->i_size);
423 minix_truncate(inode);
427 static int minix_write_begin(struct file *file, struct address_space *mapping,
428 loff_t pos, unsigned len, unsigned flags,
429 struct page **pagep, void **fsdata)
433 ret = block_write_begin(mapping, pos, len, flags, pagep,
436 minix_write_failed(mapping, pos + len);
441 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
443 return generic_block_bmap(mapping,block,minix_get_block);
446 static const struct address_space_operations minix_aops = {
447 .readpage = minix_readpage,
448 .writepage = minix_writepage,
449 .write_begin = minix_write_begin,
450 .write_end = generic_write_end,
454 static const struct inode_operations minix_symlink_inode_operations = {
455 .readlink = generic_readlink,
456 .get_link = page_get_link,
457 .getattr = minix_getattr,
460 void minix_set_inode(struct inode *inode, dev_t rdev)
462 if (S_ISREG(inode->i_mode)) {
463 inode->i_op = &minix_file_inode_operations;
464 inode->i_fop = &minix_file_operations;
465 inode->i_mapping->a_ops = &minix_aops;
466 } else if (S_ISDIR(inode->i_mode)) {
467 inode->i_op = &minix_dir_inode_operations;
468 inode->i_fop = &minix_dir_operations;
469 inode->i_mapping->a_ops = &minix_aops;
470 } else if (S_ISLNK(inode->i_mode)) {
471 inode->i_op = &minix_symlink_inode_operations;
472 inode_nohighmem(inode);
473 inode->i_mapping->a_ops = &minix_aops;
475 init_special_inode(inode, inode->i_mode, rdev);
479 * The minix V1 function to read an inode.
481 static struct inode *V1_minix_iget(struct inode *inode)
483 struct buffer_head * bh;
484 struct minix_inode * raw_inode;
485 struct minix_inode_info *minix_inode = minix_i(inode);
488 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
491 return ERR_PTR(-EIO);
493 if (raw_inode->i_nlinks == 0) {
494 printk("MINIX-fs: deleted inode referenced: %lu\n",
498 return ERR_PTR(-ESTALE);
500 inode->i_mode = raw_inode->i_mode;
501 i_uid_write(inode, raw_inode->i_uid);
502 i_gid_write(inode, raw_inode->i_gid);
503 set_nlink(inode, raw_inode->i_nlinks);
504 inode->i_size = raw_inode->i_size;
505 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
506 inode->i_mtime.tv_nsec = 0;
507 inode->i_atime.tv_nsec = 0;
508 inode->i_ctime.tv_nsec = 0;
510 for (i = 0; i < 9; i++)
511 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
512 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
514 unlock_new_inode(inode);
519 * The minix V2 function to read an inode.
521 static struct inode *V2_minix_iget(struct inode *inode)
523 struct buffer_head * bh;
524 struct minix2_inode * raw_inode;
525 struct minix_inode_info *minix_inode = minix_i(inode);
528 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
531 return ERR_PTR(-EIO);
533 if (raw_inode->i_nlinks == 0) {
534 printk("MINIX-fs: deleted inode referenced: %lu\n",
538 return ERR_PTR(-ESTALE);
540 inode->i_mode = raw_inode->i_mode;
541 i_uid_write(inode, raw_inode->i_uid);
542 i_gid_write(inode, raw_inode->i_gid);
543 set_nlink(inode, raw_inode->i_nlinks);
544 inode->i_size = raw_inode->i_size;
545 inode->i_mtime.tv_sec = raw_inode->i_mtime;
546 inode->i_atime.tv_sec = raw_inode->i_atime;
547 inode->i_ctime.tv_sec = raw_inode->i_ctime;
548 inode->i_mtime.tv_nsec = 0;
549 inode->i_atime.tv_nsec = 0;
550 inode->i_ctime.tv_nsec = 0;
552 for (i = 0; i < 10; i++)
553 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
554 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
556 unlock_new_inode(inode);
561 * The global function to read an inode.
563 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
567 inode = iget_locked(sb, ino);
569 return ERR_PTR(-ENOMEM);
570 if (!(inode->i_state & I_NEW))
573 if (INODE_VERSION(inode) == MINIX_V1)
574 return V1_minix_iget(inode);
576 return V2_minix_iget(inode);
580 * The minix V1 function to synchronize an inode.
582 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
584 struct buffer_head * bh;
585 struct minix_inode * raw_inode;
586 struct minix_inode_info *minix_inode = minix_i(inode);
589 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
592 raw_inode->i_mode = inode->i_mode;
593 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
594 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
595 raw_inode->i_nlinks = inode->i_nlink;
596 raw_inode->i_size = inode->i_size;
597 raw_inode->i_time = inode->i_mtime.tv_sec;
598 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
599 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
600 else for (i = 0; i < 9; i++)
601 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
602 mark_buffer_dirty(bh);
607 * The minix V2 function to synchronize an inode.
609 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
611 struct buffer_head * bh;
612 struct minix2_inode * raw_inode;
613 struct minix_inode_info *minix_inode = minix_i(inode);
616 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
619 raw_inode->i_mode = inode->i_mode;
620 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
621 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
622 raw_inode->i_nlinks = inode->i_nlink;
623 raw_inode->i_size = inode->i_size;
624 raw_inode->i_mtime = inode->i_mtime.tv_sec;
625 raw_inode->i_atime = inode->i_atime.tv_sec;
626 raw_inode->i_ctime = inode->i_ctime.tv_sec;
627 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
628 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
629 else for (i = 0; i < 10; i++)
630 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
631 mark_buffer_dirty(bh);
635 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
638 struct buffer_head *bh;
640 if (INODE_VERSION(inode) == MINIX_V1)
641 bh = V1_minix_update_inode(inode);
643 bh = V2_minix_update_inode(inode);
646 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
647 sync_dirty_buffer(bh);
648 if (buffer_req(bh) && !buffer_uptodate(bh)) {
649 printk("IO error syncing minix inode [%s:%08lx]\n",
650 inode->i_sb->s_id, inode->i_ino);
658 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
660 struct super_block *sb = dentry->d_sb;
661 generic_fillattr(d_inode(dentry), stat);
662 if (INODE_VERSION(d_inode(dentry)) == MINIX_V1)
663 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
665 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
666 stat->blksize = sb->s_blocksize;
671 * The function that is called for file truncation.
673 void minix_truncate(struct inode * inode)
675 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
677 if (INODE_VERSION(inode) == MINIX_V1)
678 V1_minix_truncate(inode);
680 V2_minix_truncate(inode);
683 static struct dentry *minix_mount(struct file_system_type *fs_type,
684 int flags, const char *dev_name, void *data)
686 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
689 static struct file_system_type minix_fs_type = {
690 .owner = THIS_MODULE,
692 .mount = minix_mount,
693 .kill_sb = kill_block_super,
694 .fs_flags = FS_REQUIRES_DEV,
696 MODULE_ALIAS_FS("minix");
698 static int __init init_minix_fs(void)
700 int err = init_inodecache();
703 err = register_filesystem(&minix_fs_type);
708 destroy_inodecache();
713 static void __exit exit_minix_fs(void)
715 unregister_filesystem(&minix_fs_type);
716 destroy_inodecache();
719 module_init(init_minix_fs)
720 module_exit(exit_minix_fs)
721 MODULE_LICENSE("GPL");