| /* |
| * linux/fs/affs/inode.c |
| * |
| * (c) 1996 Hans-Joachim Widmaier - Rewritten |
| * |
| * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. |
| * |
| * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. |
| * |
| * (C) 1991 Linus Torvalds - minix filesystem |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/statfs.h> |
| #include <linux/parser.h> |
| #include <linux/magic.h> |
| #include <linux/sched.h> |
| #include <linux/smp_lock.h> |
| #include "affs.h" |
| |
| extern struct timezone sys_tz; |
| |
| static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
| static int affs_remount (struct super_block *sb, int *flags, char *data); |
| |
| static void |
| affs_put_super(struct super_block *sb) |
| { |
| struct affs_sb_info *sbi = AFFS_SB(sb); |
| pr_debug("AFFS: put_super()\n"); |
| |
| lock_kernel(); |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); |
| secs_to_datestamp(get_seconds(), |
| &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
| affs_fix_checksum(sb, sbi->s_root_bh); |
| mark_buffer_dirty(sbi->s_root_bh); |
| } |
| |
| kfree(sbi->s_prefix); |
| affs_free_bitmap(sb); |
| affs_brelse(sbi->s_root_bh); |
| kfree(sbi); |
| sb->s_fs_info = NULL; |
| |
| unlock_kernel(); |
| } |
| |
| static void |
| affs_write_super(struct super_block *sb) |
| { |
| int clean = 2; |
| struct affs_sb_info *sbi = AFFS_SB(sb); |
| |
| lock_super(sb); |
| if (!(sb->s_flags & MS_RDONLY)) { |
| // if (sbi->s_bitmap[i].bm_bh) { |
| // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { |
| // clean = 0; |
| AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean); |
| secs_to_datestamp(get_seconds(), |
| &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
| affs_fix_checksum(sb, sbi->s_root_bh); |
| mark_buffer_dirty(sbi->s_root_bh); |
| sb->s_dirt = !clean; /* redo until bitmap synced */ |
| } else |
| sb->s_dirt = 0; |
| unlock_super(sb); |
| |
| pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); |
| } |
| |
| static struct kmem_cache * affs_inode_cachep; |
| |
| static struct inode *affs_alloc_inode(struct super_block *sb) |
| { |
| struct affs_inode_info *i; |
| |
| i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
| if (!i) |
| return NULL; |
| |
| i->vfs_inode.i_version = 1; |
| i->i_lc = NULL; |
| i->i_ext_bh = NULL; |
| i->i_pa_cnt = 0; |
| |
| return &i->vfs_inode; |
| } |
| |
| static void affs_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
| |
| init_MUTEX(&ei->i_link_lock); |
| init_MUTEX(&ei->i_ext_lock); |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int init_inodecache(void) |
| { |
| affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
| sizeof(struct affs_inode_info), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (affs_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| kmem_cache_destroy(affs_inode_cachep); |
| } |
| |
| static const struct super_operations affs_sops = { |
| .alloc_inode = affs_alloc_inode, |
| .destroy_inode = affs_destroy_inode, |
| .write_inode = affs_write_inode, |
| .delete_inode = affs_delete_inode, |
| .clear_inode = affs_clear_inode, |
| .put_super = affs_put_super, |
| .write_super = affs_write_super, |
| .statfs = affs_statfs, |
| .remount_fs = affs_remount, |
| .show_options = generic_show_options, |
| }; |
| |
| enum { |
| Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, |
| Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
| Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
| }; |
| |
| static const match_table_t tokens = { |
| {Opt_bs, "bs=%u"}, |
| {Opt_mode, "mode=%o"}, |
| {Opt_mufs, "mufs"}, |
| {Opt_prefix, "prefix=%s"}, |
| {Opt_protect, "protect"}, |
| {Opt_reserved, "reserved=%u"}, |
| {Opt_root, "root=%u"}, |
| {Opt_setgid, "setgid=%u"}, |
| {Opt_setuid, "setuid=%u"}, |
| {Opt_verbose, "verbose"}, |
| {Opt_volume, "volume=%s"}, |
| {Opt_ignore, "grpquota"}, |
| {Opt_ignore, "noquota"}, |
| {Opt_ignore, "quota"}, |
| {Opt_ignore, "usrquota"}, |
| {Opt_err, NULL}, |
| }; |
| |
| static int |
| parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, |
| int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
| { |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| |
| /* Fill in defaults */ |
| |
| *uid = current_uid(); |
| *gid = current_gid(); |
| *reserved = 2; |
| *root = -1; |
| *blocksize = -1; |
| volume[0] = ':'; |
| volume[1] = 0; |
| *mount_opts = 0; |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token, n, option; |
| if (!*p) |
| continue; |
| |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case Opt_bs: |
| if (match_int(&args[0], &n)) |
| return -EINVAL; |
| if (n != 512 && n != 1024 && n != 2048 |
| && n != 4096) { |
| printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
| return 0; |
| } |
| *blocksize = n; |
| break; |
| case Opt_mode: |
| if (match_octal(&args[0], &option)) |
| return 1; |
| *mode = option & 0777; |
| *mount_opts |= SF_SETMODE; |
| break; |
| case Opt_mufs: |
| *mount_opts |= SF_MUFS; |
| break; |
| case Opt_prefix: |
| /* Free any previous prefix */ |
| kfree(*prefix); |
| *prefix = match_strdup(&args[0]); |
| if (!*prefix) |
| return 0; |
| *mount_opts |= SF_PREFIX; |
| break; |
| case Opt_protect: |
| *mount_opts |= SF_IMMUTABLE; |
| break; |
| case Opt_reserved: |
| if (match_int(&args[0], reserved)) |
| return 1; |
| break; |
| case Opt_root: |
| if (match_int(&args[0], root)) |
| return 1; |
| break; |
| case Opt_setgid: |
| if (match_int(&args[0], &option)) |
| return 1; |
| *gid = option; |
| *mount_opts |= SF_SETGID; |
| break; |
| case Opt_setuid: |
| if (match_int(&args[0], &option)) |
| return -EINVAL; |
| *uid = option; |
| *mount_opts |= SF_SETUID; |
| break; |
| case Opt_verbose: |
| *mount_opts |= SF_VERBOSE; |
| break; |
| case Opt_volume: { |
| char *vol = match_strdup(&args[0]); |
| if (!vol) |
| return 0; |
| strlcpy(volume, vol, 32); |
| kfree(vol); |
| break; |
| } |
| case Opt_ignore: |
| /* Silently ignore the quota options */ |
| break; |
| default: |
| printk("AFFS: Unrecognized mount option \"%s\" " |
| "or missing value\n", p); |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /* This function definitely needs to be split up. Some fine day I'll |
| * hopefully have the guts to do so. Until then: sorry for the mess. |
| */ |
| |
| static int affs_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct affs_sb_info *sbi; |
| struct buffer_head *root_bh = NULL; |
| struct buffer_head *boot_bh; |
| struct inode *root_inode = NULL; |
| s32 root_block; |
| int size, blocksize; |
| u32 chksum; |
| int num_bm; |
| int i, j; |
| s32 key; |
| uid_t uid; |
| gid_t gid; |
| int reserved; |
| unsigned long mount_flags; |
| int tmp_flags; /* fix remount prototype... */ |
| u8 sig[4]; |
| int ret = -EINVAL; |
| |
| save_mount_options(sb, data); |
| |
| pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
| |
| sb->s_magic = AFFS_SUPER_MAGIC; |
| sb->s_op = &affs_sops; |
| sb->s_flags |= MS_NODIRATIME; |
| |
| sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| sb->s_fs_info = sbi; |
| mutex_init(&sbi->s_bmlock); |
| |
| if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
| &blocksize,&sbi->s_prefix, |
| sbi->s_volume, &mount_flags)) { |
| printk(KERN_ERR "AFFS: Error parsing options\n"); |
| return -EINVAL; |
| } |
| /* N.B. after this point s_prefix must be released */ |
| |
| sbi->s_flags = mount_flags; |
| sbi->s_mode = i; |
| sbi->s_uid = uid; |
| sbi->s_gid = gid; |
| sbi->s_reserved= reserved; |
| |
| /* Get the size of the device in 512-byte blocks. |
| * If we later see that the partition uses bigger |
| * blocks, we will have to change it. |
| */ |
| |
| size = sb->s_bdev->bd_inode->i_size >> 9; |
| pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); |
| |
| affs_set_blocksize(sb, PAGE_SIZE); |
| /* Try to find root block. Its location depends on the block size. */ |
| |
| i = 512; |
| j = 4096; |
| if (blocksize > 0) { |
| i = j = blocksize; |
| size = size / (blocksize / 512); |
| } |
| for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { |
| sbi->s_root_block = root_block; |
| if (root_block < 0) |
| sbi->s_root_block = (reserved + size - 1) / 2; |
| pr_debug("AFFS: setting blocksize to %d\n", blocksize); |
| affs_set_blocksize(sb, blocksize); |
| sbi->s_partition_size = size; |
| |
| /* The root block location that was calculated above is not |
| * correct if the partition size is an odd number of 512- |
| * byte blocks, which will be rounded down to a number of |
| * 1024-byte blocks, and if there were an even number of |
| * reserved blocks. Ideally, all partition checkers should |
| * report the real number of blocks of the real blocksize, |
| * but since this just cannot be done, we have to try to |
| * find the root block anyways. In the above case, it is one |
| * block behind the calculated one. So we check this one, too. |
| */ |
| for (num_bm = 0; num_bm < 2; num_bm++) { |
| pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " |
| "size=%d, reserved=%d\n", |
| sb->s_id, |
| sbi->s_root_block + num_bm, |
| blocksize, size, reserved); |
| root_bh = affs_bread(sb, sbi->s_root_block + num_bm); |
| if (!root_bh) |
| continue; |
| if (!affs_checksum_block(sb, root_bh) && |
| be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
| be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
| sbi->s_hashsize = blocksize / 4 - 56; |
| sbi->s_root_block += num_bm; |
| key = 1; |
| goto got_root; |
| } |
| affs_brelse(root_bh); |
| root_bh = NULL; |
| } |
| } |
| if (!silent) |
| printk(KERN_ERR "AFFS: No valid root block on device %s\n", |
| sb->s_id); |
| goto out_error; |
| |
| /* N.B. after this point bh must be released */ |
| got_root: |
| root_block = sbi->s_root_block; |
| |
| /* Find out which kind of FS we have */ |
| boot_bh = sb_bread(sb, 0); |
| if (!boot_bh) { |
| printk(KERN_ERR "AFFS: Cannot read boot block\n"); |
| goto out_error; |
| } |
| memcpy(sig, boot_bh->b_data, 4); |
| brelse(boot_bh); |
| chksum = be32_to_cpu(*(__be32 *)sig); |
| |
| /* Dircache filesystems are compatible with non-dircache ones |
| * when reading. As long as they aren't supported, writing is |
| * not recommended. |
| */ |
| if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
| || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { |
| printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", |
| sb->s_id); |
| sb->s_flags |= MS_RDONLY; |
| } |
| switch (chksum) { |
| case MUFS_FS: |
| case MUFS_INTLFFS: |
| case MUFS_DCFFS: |
| sbi->s_flags |= SF_MUFS; |
| /* fall thru */ |
| case FS_INTLFFS: |
| case FS_DCFFS: |
| sbi->s_flags |= SF_INTL; |
| break; |
| case MUFS_FFS: |
| sbi->s_flags |= SF_MUFS; |
| break; |
| case FS_FFS: |
| break; |
| case MUFS_OFS: |
| sbi->s_flags |= SF_MUFS; |
| /* fall thru */ |
| case FS_OFS: |
| sbi->s_flags |= SF_OFS; |
| sb->s_flags |= MS_NOEXEC; |
| break; |
| case MUFS_DCOFS: |
| case MUFS_INTLOFS: |
| sbi->s_flags |= SF_MUFS; |
| case FS_DCOFS: |
| case FS_INTLOFS: |
| sbi->s_flags |= SF_INTL | SF_OFS; |
| sb->s_flags |= MS_NOEXEC; |
| break; |
| default: |
| printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", |
| sb->s_id, chksum); |
| goto out_error; |
| } |
| |
| if (mount_flags & SF_VERBOSE) { |
| u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
| printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
| len > 31 ? 31 : len, |
| AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
| sig, sig[3] + '0', blocksize); |
| } |
| |
| sb->s_flags |= MS_NODEV | MS_NOSUID; |
| |
| sbi->s_data_blksize = sb->s_blocksize; |
| if (sbi->s_flags & SF_OFS) |
| sbi->s_data_blksize -= 24; |
| |
| /* Keep super block in cache */ |
| sbi->s_root_bh = root_bh; |
| /* N.B. after this point s_root_bh must be released */ |
| |
| tmp_flags = sb->s_flags; |
| if (affs_init_bitmap(sb, &tmp_flags)) |
| goto out_error; |
| sb->s_flags = tmp_flags; |
| |
| /* set up enough so that it can read an inode */ |
| |
| root_inode = affs_iget(sb, root_block); |
| if (IS_ERR(root_inode)) { |
| ret = PTR_ERR(root_inode); |
| goto out_error_noinode; |
| } |
| |
| sb->s_root = d_alloc_root(root_inode); |
| if (!sb->s_root) { |
| printk(KERN_ERR "AFFS: Get root inode failed\n"); |
| goto out_error; |
| } |
| sb->s_root->d_op = &affs_dentry_operations; |
| |
| pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); |
| return 0; |
| |
| /* |
| * Begin the cascaded cleanup ... |
| */ |
| out_error: |
| if (root_inode) |
| iput(root_inode); |
| out_error_noinode: |
| kfree(sbi->s_bitmap); |
| affs_brelse(root_bh); |
| kfree(sbi->s_prefix); |
| kfree(sbi); |
| sb->s_fs_info = NULL; |
| return ret; |
| } |
| |
| static int |
| affs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct affs_sb_info *sbi = AFFS_SB(sb); |
| int blocksize; |
| uid_t uid; |
| gid_t gid; |
| int mode; |
| int reserved; |
| int root_block; |
| unsigned long mount_flags; |
| int res = 0; |
| char *new_opts = kstrdup(data, GFP_KERNEL); |
| |
| pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); |
| |
| *flags |= MS_NODIRATIME; |
| |
| if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
| &blocksize, &sbi->s_prefix, sbi->s_volume, |
| &mount_flags)) { |
| kfree(new_opts); |
| return -EINVAL; |
| } |
| lock_kernel(); |
| replace_mount_options(sb, new_opts); |
| |
| sbi->s_flags = mount_flags; |
| sbi->s_mode = mode; |
| sbi->s_uid = uid; |
| sbi->s_gid = gid; |
| |
| if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
| unlock_kernel(); |
| return 0; |
| } |
| if (*flags & MS_RDONLY) { |
| sb->s_dirt = 1; |
| while (sb->s_dirt) |
| affs_write_super(sb); |
| affs_free_bitmap(sb); |
| } else |
| res = affs_init_bitmap(sb, flags); |
| |
| unlock_kernel(); |
| return res; |
| } |
| |
| static int |
| affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| int free; |
| u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| |
| pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, |
| AFFS_SB(sb)->s_reserved); |
| |
| free = affs_count_free_blocks(sb); |
| buf->f_type = AFFS_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
| buf->f_bfree = free; |
| buf->f_bavail = free; |
| buf->f_fsid.val[0] = (u32)id; |
| buf->f_fsid.val[1] = (u32)(id >> 32); |
| buf->f_namelen = 30; |
| return 0; |
| } |
| |
| static int affs_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super, |
| mnt); |
| } |
| |
| static struct file_system_type affs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "affs", |
| .get_sb = affs_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static int __init init_affs_fs(void) |
| { |
| int err = init_inodecache(); |
| if (err) |
| goto out1; |
| err = register_filesystem(&affs_fs_type); |
| if (err) |
| goto out; |
| return 0; |
| out: |
| destroy_inodecache(); |
| out1: |
| return err; |
| } |
| |
| static void __exit exit_affs_fs(void) |
| { |
| unregister_filesystem(&affs_fs_type); |
| destroy_inodecache(); |
| } |
| |
| MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(init_affs_fs) |
| module_exit(exit_affs_fs) |