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);
spin_lock_init(&sbi->symlink_lock);
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");
kfree(sbi->s_prefix);
kfree(sbi);
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 struct super_block *
affs_read_super(struct super_block *sb, void *data, int silent)
{
struct buffer_head *root_bh = NULL;
struct buffer_head *boot_bh;
struct inode *root_inode = NULL;
kdev_t dev = sb->s_dev;
s32 root_block;
int blocks, size, blocksize;
u32 chksum;
int num_bm;
int i, j;
s32 key;
uid_t uid;
gid_t gid;
int reserved;
unsigned long mount_flags;
pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
sb->s_magic = AFFS_SUPER_MAGIC;
sb->s_op = &affs_sops;
memset(AFFS_SB, 0, sizeof(struct affs_sb_info));
init_MUTEX(&AFFS_SB->s_bmlock);
if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
&blocksize,&AFFS_SB->s_prefix,
AFFS_SB->s_volume, &mount_flags)) {
printk(KERN_ERR "AFFS: Error parsing options\n");
return NULL;
}
/* N.B. after this point s_prefix must be released */
AFFS_SB->s_flags = mount_flags;
AFFS_SB->s_mode = i;
AFFS_SB->s_uid = uid;
AFFS_SB->s_gid = gid;
AFFS_SB->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.
*/
blocks = blk_size[MAJOR(dev)] ? blk_size[MAJOR(dev)][MINOR(dev)] : 0;
if (!blocks) {
printk(KERN_ERR "AFFS: Could not determine device size\n");
goto out_error;
}
size = (BLOCK_SIZE / 512) * blocks;
pr_debug("AFFS: initial blksize=%d, blocks=%d\n", 512, blocks);
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) {
AFFS_SB->s_root_block = root_block;
if (root_block < 0)
AFFS_SB->s_root_block = (reserved + size - 1) / 2;
pr_debug("AFFS: setting blocksize to %d\n", blocksize);
affs_set_blocksize(sb, blocksize);
AFFS_SB->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",
kdevname(dev),
AFFS_SB->s_root_block + num_bm,
blocksize, size, reserved);
root_bh = affs_bread(sb, AFFS_SB->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) {
AFFS_SB->s_hashsize = blocksize / 4 - 56;
AFFS_SB->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",
kdevname(dev));
goto out_error;
/* N.B. after this point bh must be released */
got_root:
root_block = AFFS_SB->s_root_block;
sb->s_blocksize_bits = blocksize == 512 ? 9 :
blocksize == 1024 ? 10 :
blocksize == 2048 ? 11 : 12;
/* Find out which kind of FS we have */
boot_bh = bread(sb->s_dev, 0, sb->s_blocksize);
if (!boot_bh) {
printk(KERN_ERR "AFFS: Cannot read boot block\n");
goto out_error;
}
chksum = be32_to_cpu(*(u32 *)boot_bh->b_data);
brelse(boot_bh);
/* 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",
kdevname(dev));
sb->s_flags |= MS_RDONLY;
AFFS_SB->s_flags |= SF_READONLY;
}
switch (chksum) {
case MUFS_FS:
case MUFS_INTLFFS:
case MUFS_DCFFS:
AFFS_SB->s_flags |= SF_MUFS;
/* fall thru */
case FS_INTLFFS:
case FS_DCFFS:
AFFS_SB->s_flags |= SF_INTL;
break;
case MUFS_FFS:
AFFS_SB->s_flags |= SF_MUFS;
break;
case FS_FFS:
break;
case MUFS_OFS:
AFFS_SB->s_flags |= SF_MUFS;
/* fall thru */
case FS_OFS:
AFFS_SB->s_flags |= SF_OFS;
sb->s_flags |= MS_NOEXEC;
break;
case MUFS_DCOFS:
case MUFS_INTLOFS:
AFFS_SB->s_flags |= SF_MUFS;
case FS_DCOFS:
case FS_INTLOFS:
AFFS_SB->s_flags |= SF_INTL | SF_OFS;
sb->s_flags |= MS_NOEXEC;
break;
default:
printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
kdevname(dev), chksum);
goto out_error;
}
if (mount_flags & SF_VERBOSE) {
chksum = cpu_to_be32(chksum);
printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
}
sb->s_flags |= MS_NODEV | MS_NOSUID;
AFFS_SB->s_data_blksize = sb->s_blocksize;
if (AFFS_SB->s_flags & SF_OFS)
AFFS_SB->s_data_blksize -= 24;
/* Keep super block in cache */
AFFS_SB->s_root_bh = root_bh;
/* N.B. after this point s_root_bh must be released */
if (affs_init_bitmap(sb))
goto out_error;
/* set up enough so that it can read an inode */
root_inode = iget(sb, root_block);
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 sb;
/*
* Begin the cascaded cleanup ...
*/
out_error:
if (root_inode)
iput(root_inode);
if (AFFS_SB->s_bitmap)
kfree(AFFS_SB->s_bitmap);
affs_brelse(root_bh);
if (AFFS_SB->s_prefix)
kfree(AFFS_SB->s_prefix);
return NULL;
}