2 * linux/fs/affs/inode.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
13 #include <linux/module.h>
14 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/stat.h>
18 #include <linux/time.h>
19 #include <linux/affs_fs.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/genhd.h>
24 #include <linux/amigaffs.h>
25 #include <linux/major.h>
26 #include <linux/blkdev.h>
27 #include <linux/init.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/vfs.h>
31 #include <linux/parser.h>
32 #include <asm/system.h>
33 #include <asm/uaccess.h>
35 extern struct timezone sys_tz;
37 static int affs_statfs(struct super_block *sb, struct kstatfs *buf);
38 static int affs_remount (struct super_block *sb, int *flags, char *data);
41 affs_put_super(struct super_block *sb)
43 struct affs_sb_info *sbi = AFFS_SB(sb);
44 pr_debug("AFFS: put_super()\n");
46 if (!(sb->s_flags & MS_RDONLY)) {
47 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = be32_to_cpu(1);
48 secs_to_datestamp(get_seconds(),
49 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
50 affs_fix_checksum(sb, sbi->s_root_bh);
51 mark_buffer_dirty(sbi->s_root_bh);
57 affs_brelse(sbi->s_root_bh);
64 affs_write_super(struct super_block *sb)
67 struct affs_sb_info *sbi = AFFS_SB(sb);
69 if (!(sb->s_flags & MS_RDONLY)) {
70 // if (sbi->s_bitmap[i].bm_bh) {
71 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
73 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = be32_to_cpu(clean);
74 secs_to_datestamp(get_seconds(),
75 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
76 affs_fix_checksum(sb, sbi->s_root_bh);
77 mark_buffer_dirty(sbi->s_root_bh);
78 sb->s_dirt = !clean; /* redo until bitmap synced */
82 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
85 static kmem_cache_t * affs_inode_cachep;
87 static struct inode *affs_alloc_inode(struct super_block *sb)
89 struct affs_inode_info *ei;
90 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
93 ei->vfs_inode.i_version = 1;
94 return &ei->vfs_inode;
97 static void affs_destroy_inode(struct inode *inode)
99 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
102 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
104 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
106 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
107 SLAB_CTOR_CONSTRUCTOR) {
108 init_MUTEX(&ei->i_link_lock);
109 init_MUTEX(&ei->i_ext_lock);
110 inode_init_once(&ei->vfs_inode);
114 static int init_inodecache(void)
116 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
117 sizeof(struct affs_inode_info),
118 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
120 if (affs_inode_cachep == NULL)
125 static void destroy_inodecache(void)
127 if (kmem_cache_destroy(affs_inode_cachep))
128 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
131 static struct super_operations affs_sops = {
132 .alloc_inode = affs_alloc_inode,
133 .destroy_inode = affs_destroy_inode,
134 .read_inode = affs_read_inode,
135 .write_inode = affs_write_inode,
136 .put_inode = affs_put_inode,
137 .delete_inode = affs_delete_inode,
138 .clear_inode = affs_clear_inode,
139 .put_super = affs_put_super,
140 .write_super = affs_write_super,
141 .statfs = affs_statfs,
142 .remount_fs = affs_remount,
146 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
147 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
148 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
151 static match_table_t tokens = {
153 {Opt_mode, "mode=%o"},
155 {Opt_prefix, "prefix=%s"},
156 {Opt_protect, "protect"},
157 {Opt_reserved, "reserved=%u"},
158 {Opt_root, "root=%u"},
159 {Opt_setgid, "setgid=%u"},
160 {Opt_setuid, "setuid=%u"},
161 {Opt_verbose, "verbose"},
162 {Opt_volume, "volume=%s"},
163 {Opt_ignore, "grpquota"},
164 {Opt_ignore, "noquota"},
165 {Opt_ignore, "quota"},
166 {Opt_ignore, "usrquota"},
171 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
172 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
175 substring_t args[MAX_OPT_ARGS];
177 /* Fill in defaults */
190 while ((p = strsep(&options, ",")) != NULL) {
191 int token, n, option;
195 token = match_token(p, tokens, args);
198 if (match_int(&args[0], &n))
200 if (n != 512 && n != 1024 && n != 2048
202 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
208 if (match_octal(&args[0], &option))
210 *mode = option & 0777;
211 *mount_opts |= SF_SETMODE;
214 *mount_opts |= SF_MUFS;
217 if (*prefix) { /* Free any previous prefix */
221 *prefix = match_strdup(&args[0]);
224 *mount_opts |= SF_PREFIX;
227 *mount_opts |= SF_IMMUTABLE;
230 if (match_int(&args[0], reserved))
234 if (match_int(&args[0], root))
238 if (match_int(&args[0], &option))
241 *mount_opts |= SF_SETGID;
244 if (match_int(&args[0], &option))
247 *mount_opts |= SF_SETUID;
250 *mount_opts |= SF_VERBOSE;
253 char *vol = match_strdup(&args[0]);
254 strlcpy(volume, vol, 32);
259 /* Silently ignore the quota options */
262 printk("AFFS: Unrecognized mount option \"%s\" "
263 "or missing value\n", p);
270 /* This function definitely needs to be split up. Some fine day I'll
271 * hopefully have the guts to do so. Until then: sorry for the mess.
274 static int affs_fill_super(struct super_block *sb, void *data, int silent)
276 struct affs_sb_info *sbi;
277 struct buffer_head *root_bh = NULL;
278 struct buffer_head *boot_bh;
279 struct inode *root_inode = NULL;
289 unsigned long mount_flags;
290 int tmp_flags; /* fix remount prototype... */
292 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
294 sb->s_magic = AFFS_SUPER_MAGIC;
295 sb->s_op = &affs_sops;
296 sb->s_flags |= MS_NODIRATIME;
298 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
302 memset(sbi, 0, sizeof(*sbi));
303 init_MUTEX(&sbi->s_bmlock);
305 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
306 &blocksize,&sbi->s_prefix,
307 sbi->s_volume, &mount_flags)) {
308 printk(KERN_ERR "AFFS: Error parsing options\n");
311 /* N.B. after this point s_prefix must be released */
313 sbi->s_flags = mount_flags;
317 sbi->s_reserved= reserved;
319 /* Get the size of the device in 512-byte blocks.
320 * If we later see that the partition uses bigger
321 * blocks, we will have to change it.
324 size = sb->s_bdev->bd_inode->i_size >> 9;
325 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
327 affs_set_blocksize(sb, PAGE_SIZE);
328 /* Try to find root block. Its location depends on the block size. */
334 size = size / (blocksize / 512);
336 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
337 sbi->s_root_block = root_block;
339 sbi->s_root_block = (reserved + size - 1) / 2;
340 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
341 affs_set_blocksize(sb, blocksize);
342 sbi->s_partition_size = size;
344 /* The root block location that was calculated above is not
345 * correct if the partition size is an odd number of 512-
346 * byte blocks, which will be rounded down to a number of
347 * 1024-byte blocks, and if there were an even number of
348 * reserved blocks. Ideally, all partition checkers should
349 * report the real number of blocks of the real blocksize,
350 * but since this just cannot be done, we have to try to
351 * find the root block anyways. In the above case, it is one
352 * block behind the calculated one. So we check this one, too.
354 for (num_bm = 0; num_bm < 2; num_bm++) {
355 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
356 "size=%d, reserved=%d\n",
358 sbi->s_root_block + num_bm,
359 blocksize, size, reserved);
360 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
363 if (!affs_checksum_block(sb, root_bh) &&
364 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
365 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
366 sbi->s_hashsize = blocksize / 4 - 56;
367 sbi->s_root_block += num_bm;
371 affs_brelse(root_bh);
376 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
380 /* N.B. after this point bh must be released */
382 root_block = sbi->s_root_block;
384 /* Find out which kind of FS we have */
385 boot_bh = sb_bread(sb, 0);
387 printk(KERN_ERR "AFFS: Cannot read boot block\n");
390 chksum = be32_to_cpu(*(u32 *)boot_bh->b_data);
393 /* Dircache filesystems are compatible with non-dircache ones
394 * when reading. As long as they aren't supported, writing is
397 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
398 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
399 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
401 sb->s_flags |= MS_RDONLY;
407 sbi->s_flags |= SF_MUFS;
411 sbi->s_flags |= SF_INTL;
414 sbi->s_flags |= SF_MUFS;
419 sbi->s_flags |= SF_MUFS;
422 sbi->s_flags |= SF_OFS;
423 sb->s_flags |= MS_NOEXEC;
427 sbi->s_flags |= SF_MUFS;
430 sbi->s_flags |= SF_INTL | SF_OFS;
431 sb->s_flags |= MS_NOEXEC;
434 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
439 if (mount_flags & SF_VERBOSE) {
440 chksum = cpu_to_be32(chksum);
441 printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
442 AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
443 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
444 (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
447 sb->s_flags |= MS_NODEV | MS_NOSUID;
449 sbi->s_data_blksize = sb->s_blocksize;
450 if (sbi->s_flags & SF_OFS)
451 sbi->s_data_blksize -= 24;
453 /* Keep super block in cache */
454 sbi->s_root_bh = root_bh;
455 /* N.B. after this point s_root_bh must be released */
457 tmp_flags = sb->s_flags;
458 if (affs_init_bitmap(sb, &tmp_flags))
460 sb->s_flags = tmp_flags;
462 /* set up enough so that it can read an inode */
464 root_inode = iget(sb, root_block);
465 sb->s_root = d_alloc_root(root_inode);
467 printk(KERN_ERR "AFFS: Get root inode failed\n");
470 sb->s_root->d_op = &affs_dentry_operations;
472 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
476 * Begin the cascaded cleanup ...
482 kfree(sbi->s_bitmap);
483 affs_brelse(root_bh);
485 kfree(sbi->s_prefix);
487 sb->s_fs_info = NULL;
492 affs_remount(struct super_block *sb, int *flags, char *data)
494 struct affs_sb_info *sbi = AFFS_SB(sb);
501 unsigned long mount_flags;
504 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
506 *flags |= MS_NODIRATIME;
508 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
509 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
511 sbi->s_flags = mount_flags;
516 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
518 if (*flags & MS_RDONLY) {
521 affs_write_super(sb);
522 affs_free_bitmap(sb);
524 res = affs_init_bitmap(sb, flags);
530 affs_statfs(struct super_block *sb, struct kstatfs *buf)
534 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
535 AFFS_SB(sb)->s_reserved);
537 free = affs_count_free_blocks(sb);
538 buf->f_type = AFFS_SUPER_MAGIC;
539 buf->f_bsize = sb->s_blocksize;
540 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
542 buf->f_bavail = free;
546 static struct super_block *affs_get_sb(struct file_system_type *fs_type,
547 int flags, const char *dev_name, void *data)
549 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super);
552 static struct file_system_type affs_fs_type = {
553 .owner = THIS_MODULE,
555 .get_sb = affs_get_sb,
556 .kill_sb = kill_block_super,
557 .fs_flags = FS_REQUIRES_DEV,
560 static int __init init_affs_fs(void)
562 int err = init_inodecache();
565 err = register_filesystem(&affs_fs_type);
570 destroy_inodecache();
575 static void __exit exit_affs_fs(void)
577 unregister_filesystem(&affs_fs_type);
578 destroy_inodecache();
581 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
582 MODULE_LICENSE("GPL");
584 module_init(init_affs_fs)
585 module_exit(exit_affs_fs)