When toggling the bg_use_meta_csum feature, we should rewrite the block groups
with the desired checksum.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
misc/tune2fs.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 48 insertions(+), 2 deletions(-)
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index ac5e945..2d0ea50 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -92,6 +92,7 @@ static unsigned long new_inode_size;
static char *ext_mount_opts;
static int usrquota, grpquota;
static int rewrite_checksums;
+static int rewrite_bgs_for_checksum;
int journal_size, journal_flags;
char *journal_device;
@@ -137,7 +138,8 @@ static __u32 ok_features[3] = {
EXT2_FEATURE_INCOMPAT_FILETYPE |
EXT3_FEATURE_INCOMPAT_EXTENTS |
EXT4_FEATURE_INCOMPAT_FLEX_BG |
- EXT4_FEATURE_INCOMPAT_MMP,
+ EXT4_FEATURE_INCOMPAT_MMP |
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM,
/* R/O compat */
EXT2_FEATURE_RO_COMPAT_LARGE_FILE |
EXT4_FEATURE_RO_COMPAT_HUGE_FILE|
@@ -157,7 +159,8 @@ static __u32 clear_ok_features[3] = {
/* Incompat */
EXT2_FEATURE_INCOMPAT_FILETYPE |
EXT4_FEATURE_INCOMPAT_FLEX_BG |
- EXT4_FEATURE_INCOMPAT_MMP,
+ EXT4_FEATURE_INCOMPAT_MMP |
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM,
/* R/O compat */
EXT2_FEATURE_RO_COMPAT_LARGE_FILE |
EXT4_FEATURE_RO_COMPAT_HUGE_FILE|
@@ -693,8 +696,12 @@ static void rewrite_inodes(ext2_filsys fs)
static void rewrite_metadata_checksums(ext2_filsys fs)
{
+ int i;
+
fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
ext2fs_init_csum_seed(fs);
+ for (i = 0; i < fs->group_desc_count; i++)
+ ext2fs_group_desc_csum_set(fs, i);
rewrite_inodes(fs);
ext2fs_read_bitmaps(fs);
ext2fs_mark_ib_dirty(fs);
@@ -710,6 +717,29 @@ static void rewrite_metadata_checksums(ext2_filsys fs)
}
/*
+ * Rewrite just the block group checksums. Only call this function if
+ * you're _not_ calling rewrite_metadata_checksums; this function exists
+ * to handle the case that you're changing bg_use_meta_csum and NOT changing
+ * either gdt_csum or metadata_csum.
+ */
+static void rewrite_bg_checksums(ext2_filsys fs)
+{
+ int i;
+
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
+ !EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ return;
+
+ ext2fs_init_csum_seed(fs);
+ for (i = 0; i < fs->group_desc_count; i++)
+ ext2fs_group_desc_csum_set(fs, i);
+ fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
+ ext2fs_mark_super_dirty(fs);
+}
+
+/*
* Update the feature set as provided by the user.
*/
static int update_feature_set(ext2_filsys fs, char *features)
@@ -881,6 +911,20 @@ mmp_error:
}
}
+ if (FEATURE_ON(E2P_FEATURE_INCOMPAT,
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM)) {
+ if (check_fsck_needed(fs))
+ exit(1);
+ rewrite_bgs_for_checksum = 1;
+ }
+
+ if (FEATURE_OFF(E2P_FEATURE_INCOMPAT,
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM)) {
+ if (check_fsck_needed(fs))
+ exit(1);
+ rewrite_bgs_for_checksum = 1;
+ }
+
if (FEATURE_ON(E2P_FEATURE_RO_INCOMPAT,
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
if (check_fsck_needed(fs))
@@ -2543,6 +2587,8 @@ retry_open:
}
if (rewrite_checksums)
rewrite_metadata_checksums(fs);
+ else if (rewrite_bgs_for_checksum)
+ rewrite_bg_checksums(fs);
if (I_flag) {
if (mount_flags & EXT2_MF_MOUNTED) {
fputs(_("The inode size may only be "
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