2 * linux/fs/minix/inode.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
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 void minix_read_inode(struct inode * inode);
22 static int minix_write_inode(struct inode * inode, int wait);
23 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
24 static int minix_remount (struct super_block * sb, int * flags, char * data);
26 static void minix_delete_inode(struct inode *inode)
28 truncate_inode_pages(&inode->i_data, 0);
30 minix_truncate(inode);
31 minix_free_inode(inode);
34 static void minix_put_super(struct super_block *sb)
37 struct minix_sb_info *sbi = minix_sb(sb);
39 if (!(sb->s_flags & MS_RDONLY)) {
40 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
41 sbi->s_ms->s_state = sbi->s_mount_state;
42 mark_buffer_dirty(sbi->s_sbh);
44 for (i = 0; i < sbi->s_imap_blocks; i++)
45 brelse(sbi->s_imap[i]);
46 for (i = 0; i < sbi->s_zmap_blocks; i++)
47 brelse(sbi->s_zmap[i]);
56 static struct kmem_cache * minix_inode_cachep;
58 static struct inode *minix_alloc_inode(struct super_block *sb)
60 struct minix_inode_info *ei;
61 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
64 return &ei->vfs_inode;
67 static void minix_destroy_inode(struct inode *inode)
69 kmem_cache_free(minix_inode_cachep, minix_i(inode));
72 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
74 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
76 inode_init_once(&ei->vfs_inode);
79 static int init_inodecache(void)
81 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
82 sizeof(struct minix_inode_info),
83 0, (SLAB_RECLAIM_ACCOUNT|
86 if (minix_inode_cachep == NULL)
91 static void destroy_inodecache(void)
93 kmem_cache_destroy(minix_inode_cachep);
96 static const struct super_operations minix_sops = {
97 .alloc_inode = minix_alloc_inode,
98 .destroy_inode = minix_destroy_inode,
99 .read_inode = minix_read_inode,
100 .write_inode = minix_write_inode,
101 .delete_inode = minix_delete_inode,
102 .put_super = minix_put_super,
103 .statfs = minix_statfs,
104 .remount_fs = minix_remount,
107 static int minix_remount (struct super_block * sb, int * flags, char * data)
109 struct minix_sb_info * sbi = minix_sb(sb);
110 struct minix_super_block * ms;
113 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
115 if (*flags & MS_RDONLY) {
116 if (ms->s_state & MINIX_VALID_FS ||
117 !(sbi->s_mount_state & MINIX_VALID_FS))
119 /* Mounting a rw partition read-only. */
120 if (sbi->s_version != MINIX_V3)
121 ms->s_state = sbi->s_mount_state;
122 mark_buffer_dirty(sbi->s_sbh);
124 /* Mount a partition which is read-only, read-write. */
125 if (sbi->s_version != MINIX_V3) {
126 sbi->s_mount_state = ms->s_state;
127 ms->s_state &= ~MINIX_VALID_FS;
129 sbi->s_mount_state = MINIX_VALID_FS;
131 mark_buffer_dirty(sbi->s_sbh);
133 if (!(sbi->s_mount_state & MINIX_VALID_FS))
134 printk("MINIX-fs warning: remounting unchecked fs, "
135 "running fsck is recommended\n");
136 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
137 printk("MINIX-fs warning: remounting fs with errors, "
138 "running fsck is recommended\n");
143 static int minix_fill_super(struct super_block *s, void *data, int silent)
145 struct buffer_head *bh;
146 struct buffer_head **map;
147 struct minix_super_block *ms;
148 struct minix3_super_block *m3s = NULL;
149 unsigned long i, block;
150 struct inode *root_inode;
151 struct minix_sb_info *sbi;
153 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
158 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
159 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
161 if (!sb_set_blocksize(s, BLOCK_SIZE))
164 if (!(bh = sb_bread(s, 1)))
167 ms = (struct minix_super_block *) bh->b_data;
170 sbi->s_mount_state = ms->s_state;
171 sbi->s_ninodes = ms->s_ninodes;
172 sbi->s_nzones = ms->s_nzones;
173 sbi->s_imap_blocks = ms->s_imap_blocks;
174 sbi->s_zmap_blocks = ms->s_zmap_blocks;
175 sbi->s_firstdatazone = ms->s_firstdatazone;
176 sbi->s_log_zone_size = ms->s_log_zone_size;
177 sbi->s_max_size = ms->s_max_size;
178 s->s_magic = ms->s_magic;
179 if (s->s_magic == MINIX_SUPER_MAGIC) {
180 sbi->s_version = MINIX_V1;
183 sbi->s_link_max = MINIX_LINK_MAX;
184 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
185 sbi->s_version = MINIX_V1;
188 sbi->s_link_max = MINIX_LINK_MAX;
189 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
190 sbi->s_version = MINIX_V2;
191 sbi->s_nzones = ms->s_zones;
194 sbi->s_link_max = MINIX2_LINK_MAX;
195 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V2;
197 sbi->s_nzones = ms->s_zones;
200 sbi->s_link_max = MINIX2_LINK_MAX;
201 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
202 m3s = (struct minix3_super_block *) bh->b_data;
203 s->s_magic = m3s->s_magic;
204 sbi->s_imap_blocks = m3s->s_imap_blocks;
205 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
206 sbi->s_firstdatazone = m3s->s_firstdatazone;
207 sbi->s_log_zone_size = m3s->s_log_zone_size;
208 sbi->s_max_size = m3s->s_max_size;
209 sbi->s_ninodes = m3s->s_ninodes;
210 sbi->s_nzones = m3s->s_zones;
213 sbi->s_version = MINIX_V3;
214 sbi->s_link_max = MINIX2_LINK_MAX;
215 sbi->s_mount_state = MINIX_VALID_FS;
216 sb_set_blocksize(s, m3s->s_blocksize);
221 * Allocate the buffer map to keep the superblock small.
223 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
225 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
226 map = kzalloc(i, GFP_KERNEL);
229 sbi->s_imap = &map[0];
230 sbi->s_zmap = &map[sbi->s_imap_blocks];
233 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
234 if (!(sbi->s_imap[i]=sb_bread(s, block)))
238 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
239 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
244 minix_set_bit(0,sbi->s_imap[0]->b_data);
245 minix_set_bit(0,sbi->s_zmap[0]->b_data);
247 /* set up enough so that it can read an inode */
248 s->s_op = &minix_sops;
249 root_inode = iget(s, MINIX_ROOT_INO);
250 if (!root_inode || is_bad_inode(root_inode))
253 s->s_root = d_alloc_root(root_inode);
258 s->s_root->d_op = &minix_dentry_operations;
260 if (!(s->s_flags & MS_RDONLY)) {
261 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
262 ms->s_state &= ~MINIX_VALID_FS;
263 mark_buffer_dirty(bh);
265 if (!(sbi->s_mount_state & MINIX_VALID_FS))
266 printk("MINIX-fs: mounting unchecked file system, "
267 "running fsck is recommended\n");
268 else if (sbi->s_mount_state & MINIX_ERROR_FS)
269 printk("MINIX-fs: mounting file system with errors, "
270 "running fsck is recommended\n");
279 printk("MINIX-fs: get root inode failed\n");
283 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
285 for (i = 0; i < sbi->s_imap_blocks; i++)
286 brelse(sbi->s_imap[i]);
287 for (i = 0; i < sbi->s_zmap_blocks; i++)
288 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 minix_sb_info *sbi = minix_sb(dentry->d_sb);
325 buf->f_type = dentry->d_sb->s_magic;
326 buf->f_bsize = dentry->d_sb->s_blocksize;
327 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
328 buf->f_bfree = minix_count_free_blocks(sbi);
329 buf->f_bavail = buf->f_bfree;
330 buf->f_files = sbi->s_ninodes;
331 buf->f_ffree = minix_count_free_inodes(sbi);
332 buf->f_namelen = sbi->s_namelen;
336 static int minix_get_block(struct inode *inode, sector_t block,
337 struct buffer_head *bh_result, int create)
339 if (INODE_VERSION(inode) == MINIX_V1)
340 return V1_minix_get_block(inode, block, bh_result, create);
342 return V2_minix_get_block(inode, block, bh_result, create);
345 static int minix_writepage(struct page *page, struct writeback_control *wbc)
347 return block_write_full_page(page, minix_get_block, wbc);
350 static int minix_readpage(struct file *file, struct page *page)
352 return block_read_full_page(page,minix_get_block);
355 int __minix_write_begin(struct file *file, struct address_space *mapping,
356 loff_t pos, unsigned len, unsigned flags,
357 struct page **pagep, void **fsdata)
359 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
363 static int minix_write_begin(struct file *file, struct address_space *mapping,
364 loff_t pos, unsigned len, unsigned flags,
365 struct page **pagep, void **fsdata)
368 return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
371 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
373 return generic_block_bmap(mapping,block,minix_get_block);
376 static const struct address_space_operations minix_aops = {
377 .readpage = minix_readpage,
378 .writepage = minix_writepage,
379 .sync_page = block_sync_page,
380 .write_begin = minix_write_begin,
381 .write_end = generic_write_end,
385 static const struct inode_operations minix_symlink_inode_operations = {
386 .readlink = generic_readlink,
387 .follow_link = page_follow_link_light,
388 .put_link = page_put_link,
389 .getattr = minix_getattr,
392 void minix_set_inode(struct inode *inode, dev_t rdev)
394 if (S_ISREG(inode->i_mode)) {
395 inode->i_op = &minix_file_inode_operations;
396 inode->i_fop = &minix_file_operations;
397 inode->i_mapping->a_ops = &minix_aops;
398 } else if (S_ISDIR(inode->i_mode)) {
399 inode->i_op = &minix_dir_inode_operations;
400 inode->i_fop = &minix_dir_operations;
401 inode->i_mapping->a_ops = &minix_aops;
402 } else if (S_ISLNK(inode->i_mode)) {
403 inode->i_op = &minix_symlink_inode_operations;
404 inode->i_mapping->a_ops = &minix_aops;
406 init_special_inode(inode, inode->i_mode, rdev);
410 * The minix V1 function to read an inode.
412 static void V1_minix_read_inode(struct inode * inode)
414 struct buffer_head * bh;
415 struct minix_inode * raw_inode;
416 struct minix_inode_info *minix_inode = minix_i(inode);
419 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
421 make_bad_inode(inode);
424 inode->i_mode = raw_inode->i_mode;
425 inode->i_uid = (uid_t)raw_inode->i_uid;
426 inode->i_gid = (gid_t)raw_inode->i_gid;
427 inode->i_nlink = raw_inode->i_nlinks;
428 inode->i_size = raw_inode->i_size;
429 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
430 inode->i_mtime.tv_nsec = 0;
431 inode->i_atime.tv_nsec = 0;
432 inode->i_ctime.tv_nsec = 0;
434 for (i = 0; i < 9; i++)
435 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
436 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
441 * The minix V2 function to read an inode.
443 static void V2_minix_read_inode(struct inode * inode)
445 struct buffer_head * bh;
446 struct minix2_inode * raw_inode;
447 struct minix_inode_info *minix_inode = minix_i(inode);
450 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
452 make_bad_inode(inode);
455 inode->i_mode = raw_inode->i_mode;
456 inode->i_uid = (uid_t)raw_inode->i_uid;
457 inode->i_gid = (gid_t)raw_inode->i_gid;
458 inode->i_nlink = raw_inode->i_nlinks;
459 inode->i_size = raw_inode->i_size;
460 inode->i_mtime.tv_sec = raw_inode->i_mtime;
461 inode->i_atime.tv_sec = raw_inode->i_atime;
462 inode->i_ctime.tv_sec = raw_inode->i_ctime;
463 inode->i_mtime.tv_nsec = 0;
464 inode->i_atime.tv_nsec = 0;
465 inode->i_ctime.tv_nsec = 0;
467 for (i = 0; i < 10; i++)
468 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
469 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
474 * The global function to read an inode.
476 static void minix_read_inode(struct inode * inode)
478 if (INODE_VERSION(inode) == MINIX_V1)
479 V1_minix_read_inode(inode);
481 V2_minix_read_inode(inode);
485 * The minix V1 function to synchronize an inode.
487 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
489 struct buffer_head * bh;
490 struct minix_inode * raw_inode;
491 struct minix_inode_info *minix_inode = minix_i(inode);
494 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
497 raw_inode->i_mode = inode->i_mode;
498 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
499 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
500 raw_inode->i_nlinks = inode->i_nlink;
501 raw_inode->i_size = inode->i_size;
502 raw_inode->i_time = inode->i_mtime.tv_sec;
503 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
504 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
505 else for (i = 0; i < 9; i++)
506 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
507 mark_buffer_dirty(bh);
512 * The minix V2 function to synchronize an inode.
514 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
516 struct buffer_head * bh;
517 struct minix2_inode * raw_inode;
518 struct minix_inode_info *minix_inode = minix_i(inode);
521 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
524 raw_inode->i_mode = inode->i_mode;
525 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
526 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
527 raw_inode->i_nlinks = inode->i_nlink;
528 raw_inode->i_size = inode->i_size;
529 raw_inode->i_mtime = inode->i_mtime.tv_sec;
530 raw_inode->i_atime = inode->i_atime.tv_sec;
531 raw_inode->i_ctime = inode->i_ctime.tv_sec;
532 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
533 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
534 else for (i = 0; i < 10; i++)
535 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
536 mark_buffer_dirty(bh);
540 static struct buffer_head *minix_update_inode(struct inode *inode)
542 if (INODE_VERSION(inode) == MINIX_V1)
543 return V1_minix_update_inode(inode);
545 return V2_minix_update_inode(inode);
548 static int minix_write_inode(struct inode * inode, int wait)
550 brelse(minix_update_inode(inode));
554 int minix_sync_inode(struct inode * inode)
557 struct buffer_head *bh;
559 bh = minix_update_inode(inode);
560 if (bh && buffer_dirty(bh))
562 sync_dirty_buffer(bh);
563 if (buffer_req(bh) && !buffer_uptodate(bh))
565 printk("IO error syncing minix inode [%s:%08lx]\n",
566 inode->i_sb->s_id, inode->i_ino);
576 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
578 struct inode *dir = dentry->d_parent->d_inode;
579 struct super_block *sb = dir->i_sb;
580 generic_fillattr(dentry->d_inode, stat);
581 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
582 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
584 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
585 stat->blksize = sb->s_blocksize;
590 * The function that is called for file truncation.
592 void minix_truncate(struct inode * inode)
594 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
596 if (INODE_VERSION(inode) == MINIX_V1)
597 V1_minix_truncate(inode);
599 V2_minix_truncate(inode);
602 static int minix_get_sb(struct file_system_type *fs_type,
603 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
605 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
609 static struct file_system_type minix_fs_type = {
610 .owner = THIS_MODULE,
612 .get_sb = minix_get_sb,
613 .kill_sb = kill_block_super,
614 .fs_flags = FS_REQUIRES_DEV,
617 static int __init init_minix_fs(void)
619 int err = init_inodecache();
622 err = register_filesystem(&minix_fs_type);
627 destroy_inodecache();
632 static void __exit exit_minix_fs(void)
634 unregister_filesystem(&minix_fs_type);
635 destroy_inodecache();
638 module_init(init_minix_fs)
639 module_exit(exit_minix_fs)
640 MODULE_LICENSE("GPL");