--- fs/ext4/super.c

+++ fs/ext4/super.c

@@ -3619,8 +3619,7 @@ no_journal:

goto failed_mount4;

}

- if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))

- sb->s_flags |= MS_RDONLY;

+ ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);

/* determine the minimum size of new large inodes, if present */

if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {

@@ -3723,8 +3722,16 @@ no_journal:

return 0;

cantfind_ext4:

+

+ /* for debugging, sangwoo2.lee */

+ /* If you wanna use the flag 'MS_SILENT', call 'print_bh' function within below 'if'. */

+ printk("printing data of superblock-bh\n");

+ print_bh(sb, bh, 0, EXT4_BLOCK_SIZE(sb));

+ /* for debugging */

+

if (!silent)

ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");

+

goto failed_mount;

failed_mount4:

@@ -4823,6 +4830,55 @@ out:

#endif

+/* for debugging, sangwoo2.lee */

+void print_bh(struct super_block *sb, struct buffer_head *bh, int start, int len)

+{

+ print_block_data(sb, bh->b_blocknr, bh->b_data, start, len);

+}

+

+void print_block_data(struct super_block *sb, sector_t blocknr, unsigned char *data_to_dump, int start, int len)

+{

+ int i, j;

+ int bh_offset = (start / 16) * 16;

+ char row_data[17] = { 0, };

+ char row_hex[50] = { 0, };

+ char ch;

+

+ printk(KERN_ERR "As EXT4-fs error, printing data in hex\n");

+ printk(KERN_ERR " [partition info] s_id : %s, start block# : %llu\n", sb->s_id, sb->s_bdev->bd_part->start_sect);

+ printk(KERN_ERR " dump block# : %llu, start offset(byte) : %d, length(byte) : %d\n", blocknr, start, len);

+ printk(KERN_ERR "-----------------------------------------------------------------------------\n");

+

+ for (i = 0; i < (len + 15) / 16; i++)

+ {

+ for (j = 0; j < 16; j++)

+ {

+ ch = *(data_to_dump + bh_offset + j);

+ if (start <= bh_offset + j && start + len > bh_offset + j)

+ {

+ if (isascii(ch) && isprint(ch))

+ sprintf(row_data + j, "%c", ch);

+ else

+ sprintf(row_data + j, ".");

+

+ sprintf(row_hex + (j * 3), "%2.2x ", ch);

+ }

+ else

+ {

+ sprintf(row_data + j, " ");

+ sprintf(row_hex + (j * 3), "-- ");

+ }

+ }

+

+ printk(KERN_ERR "0x%4.4x : %s | %s\n", bh_offset, row_hex, row_data);

+ bh_offset += 16;

+

+ }

+ printk(KERN_ERR "-----------------------------------------------------------------------------\n");

+}

+/* for debugging */

+

+

static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,

const char *dev_name, void *data)

{