Commit ce40733c authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
Browse files

ext4: Check for return value from sb_set_blocksize 



sb_set_blocksize validates whether the specfied block size can be used by
the file system. Make sure we fail mounting the file system if the
blocksize specfied cannot be used.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
parent cb45bbe4

fs/ext4/super.c

+5 −10
Original line number Diff line number Diff line
@@ -1812,7 +1812,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) 
	unsigned long def_mount_opts;

	struct inode *root;

	int blocksize;

	int hblock;

	int db_count;

	int i;

	int needs_recovery;
@@ -1969,20 +1968,16 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) 
		goto failed_mount;

	}



	hblock = bdev_hardsect_size(sb->s_bdev);

	if (sb->s_blocksize != blocksize) {

		/*

		 * Make sure the blocksize for the filesystem is larger

		 * than the hardware sectorsize for the machine.

		 */

		if (blocksize < hblock) {

			printk(KERN_ERR "EXT4-fs: blocksize %d too small for "

			       "device blocksize %d.\n", blocksize, hblock);



		/* Validate the filesystem blocksize */

		if (!sb_set_blocksize(sb, blocksize)) {

			printk(KERN_ERR "EXT4-fs: bad block size %d.\n",

					blocksize);

			goto failed_mount;

		}



		brelse (bh);

		sb_set_blocksize(sb, blocksize);

		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;

		offset = do_div(logical_sb_block, blocksize);

		bh = sb_bread(sb, logical_sb_block);

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