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mke2fs: store checksum seed at format time 

Allow users to turn on metadata_csum_seed at format time so that UUIDs
can be live-changed at any time.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
debian
Darrick J. Wong 2016-03-05 12:53:29 -05:00 committed by Theodore Ts'o
parent 17f2fbf737
commit 1b7623b822
1 changed files with 14 additions and 1 deletions
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15
misc/mke2fs.c
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@ -1088,7 +1088,8 @@ static __u32 ok_features[3] = {
EXT4_FEATURE_INCOMPAT_MMP |
EXT4_FEATURE_INCOMPAT_64BIT|
EXT4_FEATURE_INCOMPAT_INLINE_DATA|
EXT4_FEATURE_INCOMPAT_ENCRYPT,
EXT4_FEATURE_INCOMPAT_ENCRYPT |
EXT4_FEATURE_INCOMPAT_CSUM_SEED,
/* R/O compat */
EXT2_FEATURE_RO_COMPAT_LARGE_FILE|
EXT4_FEATURE_RO_COMPAT_HUGE_FILE|
@ -2802,6 +2803,13 @@ int main (int argc, char *argv[])
"Pass -O 64bit to rectify.\n"));
}
if (ext2fs_has_feature_csum_seed(fs->super) &&
!ext2fs_has_feature_metadata_csum(fs->super)) {
printf("%s", _("The metadata_csum_seed feature "
"requres the metadata_csum feature.\n"));
exit(1);
}
/* Calculate journal blocks */
if (!journal_device && ((journal_size) ||
ext2fs_has_feature_journal(&fs_param)))
@ -2857,6 +2865,11 @@ int main (int argc, char *argv[])
}
} else
uuid_generate(fs->super->s_uuid);
if (ext2fs_has_feature_csum_seed(fs->super))
fs->super->s_checksum_seed = ext2fs_crc32c_le(~0,
fs->super->s_uuid, sizeof(fs->super->s_uuid));
ext2fs_init_csum_seed(fs);
/*