From 1b7623b82251774f5e21a2671033993a74371af5 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Sat, 5 Mar 2016 12:53:29 -0500 Subject: [PATCH] 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 Signed-off-by: Theodore Ts'o --- misc/mke2fs.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/misc/mke2fs.c b/misc/mke2fs.c index 082a5907..3ab4729d 100644 --- a/misc/mke2fs.c +++ b/misc/mke2fs.c @@ -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); /* -- 2.11.0