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);
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_free_in_core_inode(struct inode *inode)
73 kmem_cache_free(minix_inode_cachep, minix_i(inode));
76 static void init_once(void *foo)
78 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
80 inode_init_once(&ei->vfs_inode);
83 static int __init init_inodecache(void)
85 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
86 sizeof(struct minix_inode_info),
87 0, (SLAB_RECLAIM_ACCOUNT|
88 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
90 if (minix_inode_cachep == NULL)
95 static void destroy_inodecache(void)
98 * Make sure all delayed rcu free inodes are flushed before we
102 kmem_cache_destroy(minix_inode_cachep);
105 static const struct super_operations minix_sops = {
106 .alloc_inode = minix_alloc_inode,
107 .free_inode = minix_free_in_core_inode,
108 .write_inode = minix_write_inode,
109 .evict_inode = minix_evict_inode,
110 .put_super = minix_put_super,
111 .statfs = minix_statfs,
112 .remount_fs = minix_remount,
115 static int minix_remount (struct super_block * sb, int * flags, char * data)
117 struct minix_sb_info * sbi = minix_sb(sb);
118 struct minix_super_block * ms;
122 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
124 if (*flags & SB_RDONLY) {
125 if (ms->s_state & MINIX_VALID_FS ||
126 !(sbi->s_mount_state & MINIX_VALID_FS))
128 /* Mounting a rw partition read-only. */
129 if (sbi->s_version != MINIX_V3)
130 ms->s_state = sbi->s_mount_state;
131 mark_buffer_dirty(sbi->s_sbh);
133 /* Mount a partition which is read-only, read-write. */
134 if (sbi->s_version != MINIX_V3) {
135 sbi->s_mount_state = ms->s_state;
136 ms->s_state &= ~MINIX_VALID_FS;
138 sbi->s_mount_state = MINIX_VALID_FS;
140 mark_buffer_dirty(sbi->s_sbh);
142 if (!(sbi->s_mount_state & MINIX_VALID_FS))
143 printk("MINIX-fs warning: remounting unchecked fs, "
144 "running fsck is recommended\n");
145 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
146 printk("MINIX-fs warning: remounting fs with errors, "
147 "running fsck is recommended\n");
152 static int minix_fill_super(struct super_block *s, void *data, int silent)
154 struct buffer_head *bh;
155 struct buffer_head **map;
156 struct minix_super_block *ms;
157 struct minix3_super_block *m3s = NULL;
158 unsigned long i, block;
159 struct inode *root_inode;
160 struct minix_sb_info *sbi;
163 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
168 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
169 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
171 if (!sb_set_blocksize(s, BLOCK_SIZE))
174 if (!(bh = sb_bread(s, 1)))
177 ms = (struct minix_super_block *) bh->b_data;
180 sbi->s_mount_state = ms->s_state;
181 sbi->s_ninodes = ms->s_ninodes;
182 sbi->s_nzones = ms->s_nzones;
183 sbi->s_imap_blocks = ms->s_imap_blocks;
184 sbi->s_zmap_blocks = ms->s_zmap_blocks;
185 sbi->s_firstdatazone = ms->s_firstdatazone;
186 sbi->s_log_zone_size = ms->s_log_zone_size;
187 sbi->s_max_size = ms->s_max_size;
188 s->s_magic = ms->s_magic;
189 if (s->s_magic == MINIX_SUPER_MAGIC) {
190 sbi->s_version = MINIX_V1;
193 s->s_max_links = MINIX_LINK_MAX;
194 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
195 sbi->s_version = MINIX_V1;
198 s->s_max_links = MINIX_LINK_MAX;
199 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
200 sbi->s_version = MINIX_V2;
201 sbi->s_nzones = ms->s_zones;
204 s->s_max_links = MINIX2_LINK_MAX;
205 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
206 sbi->s_version = MINIX_V2;
207 sbi->s_nzones = ms->s_zones;
210 s->s_max_links = MINIX2_LINK_MAX;
211 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
212 m3s = (struct minix3_super_block *) bh->b_data;
213 s->s_magic = m3s->s_magic;
214 sbi->s_imap_blocks = m3s->s_imap_blocks;
215 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
216 sbi->s_firstdatazone = m3s->s_firstdatazone;
217 sbi->s_log_zone_size = m3s->s_log_zone_size;
218 sbi->s_max_size = m3s->s_max_size;
219 sbi->s_ninodes = m3s->s_ninodes;
220 sbi->s_nzones = m3s->s_zones;
223 sbi->s_version = MINIX_V3;
224 sbi->s_mount_state = MINIX_VALID_FS;
225 sb_set_blocksize(s, m3s->s_blocksize);
226 s->s_max_links = MINIX2_LINK_MAX;
231 * Allocate the buffer map to keep the superblock small.
233 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
235 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
236 map = kzalloc(i, GFP_KERNEL);
239 sbi->s_imap = &map[0];
240 sbi->s_zmap = &map[sbi->s_imap_blocks];
243 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
244 if (!(sbi->s_imap[i]=sb_bread(s, block)))
248 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
249 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
254 minix_set_bit(0,sbi->s_imap[0]->b_data);
255 minix_set_bit(0,sbi->s_zmap[0]->b_data);
257 /* Apparently minix can create filesystems that allocate more blocks for
258 * the bitmaps than needed. We simply ignore that, but verify it didn't
259 * create one with not enough blocks and bail out if so.
261 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
262 if (sbi->s_imap_blocks < block) {
263 printk("MINIX-fs: file system does not have enough "
264 "imap blocks allocated. Refusing to mount.\n");
268 block = minix_blocks_needed(
269 (sbi->s_nzones - sbi->s_firstdatazone + 1),
271 if (sbi->s_zmap_blocks < block) {
272 printk("MINIX-fs: file system does not have enough "
273 "zmap blocks allocated. Refusing to mount.\n");
277 /* set up enough so that it can read an inode */
278 s->s_op = &minix_sops;
279 root_inode = minix_iget(s, MINIX_ROOT_INO);
280 if (IS_ERR(root_inode)) {
281 ret = PTR_ERR(root_inode);
286 s->s_root = d_make_root(root_inode);
291 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
292 ms->s_state &= ~MINIX_VALID_FS;
293 mark_buffer_dirty(bh);
295 if (!(sbi->s_mount_state & MINIX_VALID_FS))
296 printk("MINIX-fs: mounting unchecked file system, "
297 "running fsck is recommended\n");
298 else if (sbi->s_mount_state & MINIX_ERROR_FS)
299 printk("MINIX-fs: mounting file system with errors, "
300 "running fsck is recommended\n");
306 printk("MINIX-fs: get root inode failed\n");
310 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
312 for (i = 0; i < sbi->s_imap_blocks; i++)
313 brelse(sbi->s_imap[i]);
314 for (i = 0; i < sbi->s_zmap_blocks; i++)
315 brelse(sbi->s_zmap[i]);
322 printk("MINIX-fs: can't allocate map\n");
327 printk("MINIX-fs: bad superblock\n");
332 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
333 "on device %s.\n", s->s_id);
339 printk("MINIX-fs: blocksize too small for device\n");
343 printk("MINIX-fs: unable to read superblock\n");
350 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
352 struct super_block *sb = dentry->d_sb;
353 struct minix_sb_info *sbi = minix_sb(sb);
354 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
355 buf->f_type = sb->s_magic;
356 buf->f_bsize = sb->s_blocksize;
357 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
358 buf->f_bfree = minix_count_free_blocks(sb);
359 buf->f_bavail = buf->f_bfree;
360 buf->f_files = sbi->s_ninodes;
361 buf->f_ffree = minix_count_free_inodes(sb);
362 buf->f_namelen = sbi->s_namelen;
363 buf->f_fsid.val[0] = (u32)id;
364 buf->f_fsid.val[1] = (u32)(id >> 32);
369 static int minix_get_block(struct inode *inode, sector_t block,
370 struct buffer_head *bh_result, int create)
372 if (INODE_VERSION(inode) == MINIX_V1)
373 return V1_minix_get_block(inode, block, bh_result, create);
375 return V2_minix_get_block(inode, block, bh_result, create);
378 static int minix_writepage(struct page *page, struct writeback_control *wbc)
380 return block_write_full_page(page, minix_get_block, wbc);
383 static int minix_readpage(struct file *file, struct page *page)
385 return block_read_full_page(page,minix_get_block);
388 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
390 return __block_write_begin(page, pos, len, minix_get_block);
393 static void minix_write_failed(struct address_space *mapping, loff_t to)
395 struct inode *inode = mapping->host;
397 if (to > inode->i_size) {
398 truncate_pagecache(inode, inode->i_size);
399 minix_truncate(inode);
403 static int minix_write_begin(struct file *file, struct address_space *mapping,
404 loff_t pos, unsigned len, unsigned flags,
405 struct page **pagep, void **fsdata)
409 ret = block_write_begin(mapping, pos, len, flags, pagep,
412 minix_write_failed(mapping, pos + len);
417 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
419 return generic_block_bmap(mapping,block,minix_get_block);
422 static const struct address_space_operations minix_aops = {
423 .readpage = minix_readpage,
424 .writepage = minix_writepage,
425 .write_begin = minix_write_begin,
426 .write_end = generic_write_end,
430 static const struct inode_operations minix_symlink_inode_operations = {
431 .get_link = page_get_link,
432 .getattr = minix_getattr,
435 void minix_set_inode(struct inode *inode, dev_t rdev)
437 if (S_ISREG(inode->i_mode)) {
438 inode->i_op = &minix_file_inode_operations;
439 inode->i_fop = &minix_file_operations;
440 inode->i_mapping->a_ops = &minix_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = &minix_dir_inode_operations;
443 inode->i_fop = &minix_dir_operations;
444 inode->i_mapping->a_ops = &minix_aops;
445 } else if (S_ISLNK(inode->i_mode)) {
446 inode->i_op = &minix_symlink_inode_operations;
447 inode_nohighmem(inode);
448 inode->i_mapping->a_ops = &minix_aops;
450 init_special_inode(inode, inode->i_mode, rdev);
454 * The minix V1 function to read an inode.
456 static struct inode *V1_minix_iget(struct inode *inode)
458 struct buffer_head * bh;
459 struct minix_inode * raw_inode;
460 struct minix_inode_info *minix_inode = minix_i(inode);
463 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
466 return ERR_PTR(-EIO);
468 inode->i_mode = raw_inode->i_mode;
469 i_uid_write(inode, raw_inode->i_uid);
470 i_gid_write(inode, raw_inode->i_gid);
471 set_nlink(inode, raw_inode->i_nlinks);
472 inode->i_size = raw_inode->i_size;
473 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
474 inode->i_mtime.tv_nsec = 0;
475 inode->i_atime.tv_nsec = 0;
476 inode->i_ctime.tv_nsec = 0;
478 for (i = 0; i < 9; i++)
479 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
480 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
482 unlock_new_inode(inode);
487 * The minix V2 function to read an inode.
489 static struct inode *V2_minix_iget(struct inode *inode)
491 struct buffer_head * bh;
492 struct minix2_inode * raw_inode;
493 struct minix_inode_info *minix_inode = minix_i(inode);
496 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
499 return ERR_PTR(-EIO);
501 inode->i_mode = raw_inode->i_mode;
502 i_uid_write(inode, raw_inode->i_uid);
503 i_gid_write(inode, raw_inode->i_gid);
504 set_nlink(inode, raw_inode->i_nlinks);
505 inode->i_size = raw_inode->i_size;
506 inode->i_mtime.tv_sec = raw_inode->i_mtime;
507 inode->i_atime.tv_sec = raw_inode->i_atime;
508 inode->i_ctime.tv_sec = raw_inode->i_ctime;
509 inode->i_mtime.tv_nsec = 0;
510 inode->i_atime.tv_nsec = 0;
511 inode->i_ctime.tv_nsec = 0;
513 for (i = 0; i < 10; i++)
514 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
515 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
517 unlock_new_inode(inode);
522 * The global function to read an inode.
524 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
528 inode = iget_locked(sb, ino);
530 return ERR_PTR(-ENOMEM);
531 if (!(inode->i_state & I_NEW))
534 if (INODE_VERSION(inode) == MINIX_V1)
535 return V1_minix_iget(inode);
537 return V2_minix_iget(inode);
541 * The minix V1 function to synchronize an inode.
543 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
545 struct buffer_head * bh;
546 struct minix_inode * raw_inode;
547 struct minix_inode_info *minix_inode = minix_i(inode);
550 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
553 raw_inode->i_mode = inode->i_mode;
554 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
555 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
556 raw_inode->i_nlinks = inode->i_nlink;
557 raw_inode->i_size = inode->i_size;
558 raw_inode->i_time = inode->i_mtime.tv_sec;
559 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
560 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
561 else for (i = 0; i < 9; i++)
562 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
563 mark_buffer_dirty(bh);
568 * The minix V2 function to synchronize an inode.
570 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
572 struct buffer_head * bh;
573 struct minix2_inode * raw_inode;
574 struct minix_inode_info *minix_inode = minix_i(inode);
577 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
580 raw_inode->i_mode = inode->i_mode;
581 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
582 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
583 raw_inode->i_nlinks = inode->i_nlink;
584 raw_inode->i_size = inode->i_size;
585 raw_inode->i_mtime = inode->i_mtime.tv_sec;
586 raw_inode->i_atime = inode->i_atime.tv_sec;
587 raw_inode->i_ctime = inode->i_ctime.tv_sec;
588 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
589 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
590 else for (i = 0; i < 10; i++)
591 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
592 mark_buffer_dirty(bh);
596 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
599 struct buffer_head *bh;
601 if (INODE_VERSION(inode) == MINIX_V1)
602 bh = V1_minix_update_inode(inode);
604 bh = V2_minix_update_inode(inode);
607 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
608 sync_dirty_buffer(bh);
609 if (buffer_req(bh) && !buffer_uptodate(bh)) {
610 printk("IO error syncing minix inode [%s:%08lx]\n",
611 inode->i_sb->s_id, inode->i_ino);
619 int minix_getattr(const struct path *path, struct kstat *stat,
620 u32 request_mask, unsigned int flags)
622 struct super_block *sb = path->dentry->d_sb;
623 struct inode *inode = d_inode(path->dentry);
625 generic_fillattr(inode, stat);
626 if (INODE_VERSION(inode) == MINIX_V1)
627 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
629 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
630 stat->blksize = sb->s_blocksize;
635 * The function that is called for file truncation.
637 void minix_truncate(struct inode * inode)
639 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
641 if (INODE_VERSION(inode) == MINIX_V1)
642 V1_minix_truncate(inode);
644 V2_minix_truncate(inode);
647 static struct dentry *minix_mount(struct file_system_type *fs_type,
648 int flags, const char *dev_name, void *data)
650 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
653 static struct file_system_type minix_fs_type = {
654 .owner = THIS_MODULE,
656 .mount = minix_mount,
657 .kill_sb = kill_block_super,
658 .fs_flags = FS_REQUIRES_DEV,
660 MODULE_ALIAS_FS("minix");
662 static int __init init_minix_fs(void)
664 int err = init_inodecache();
667 err = register_filesystem(&minix_fs_type);
672 destroy_inodecache();
677 static void __exit exit_minix_fs(void)
679 unregister_filesystem(&minix_fs_type);
680 destroy_inodecache();
683 module_init(init_minix_fs)
684 module_exit(exit_minix_fs)
685 MODULE_LICENSE("GPL");