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Commit d25425f8 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Theodore Ts'o
Browse files

ext4: record the checksum algorithm in use in the superblock 



Record the type of checksum algorithm we're using for metadata in the
superblock, in case we ever want/need to change the algorithm.

Signed-off-by: default avatarDarrick J. Wong <djwong@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent e6153918

fs/ext4/super.c

+18 −0
Original line number Diff line number Diff line
@@ -112,6 +112,16 @@ static struct file_system_type ext3_fs_type = { 
#define IS_EXT3_SB(sb) (0)

#endif



static int ext4_verify_csum_type(struct super_block *sb,

				 struct ext4_super_block *es)

{

	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,

					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))

		return 1;



	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;

}



void *ext4_kvmalloc(size_t size, gfp_t flags)

{

	void *ret;
@@ -3025,6 +3035,14 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) 
		goto cantfind_ext4;

	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);



	/* Check for a known checksum algorithm */

	if (!ext4_verify_csum_type(sb, es)) {

		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "

			 "unknown checksum algorithm.");

		silent = 1;

		goto cantfind_ext4;

	}



	/* Set defaults before we parse the mount options */

	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);

	set_opt(sb, INIT_INODE_TABLE);