[PATCH 5/4] mkfs: improve log extent validation

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Use the standard libxfs fsblock verifiers to check the start and end of
the internal log.  The current code does not catch the case of a
(segmented) fsblock that is beyond agf_blocks but not so large to change
the agno part of the segmented fsblock.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 libxfs/libxfs_api_defs.h |    1 +
 mkfs/xfs_mkfs.c          |   10 ++++------
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 064fb48c..f34a0483 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -207,6 +207,7 @@
 #define xfs_verify_agino		libxfs_verify_agino
 #define xfs_verify_cksum		libxfs_verify_cksum
 #define xfs_verify_dir_ino		libxfs_verify_dir_ino
+#define xfs_verify_fsbext		libxfs_verify_fsbext
 #define xfs_verify_fsbno		libxfs_verify_fsbno
 #define xfs_verify_ino			libxfs_verify_ino
 #define xfs_verify_rtbno		libxfs_verify_rtbno
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 0b1fb746..b932acaa 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -3218,15 +3218,13 @@ align_internal_log(
 	int			sunit,
 	int			max_logblocks)
 {
-	uint64_t		logend;
-
 	/* round up log start if necessary */
 	if ((cfg->logstart % sunit) != 0)
 		cfg->logstart = ((cfg->logstart + (sunit - 1)) / sunit) * sunit;
 
 	/* If our log start overlaps the next AG's metadata, fail. */
-	if (XFS_FSB_TO_AGBNO(mp, cfg->logstart) <= XFS_AGFL_BLOCK(mp)) {
-			fprintf(stderr,
+	if (!libxfs_verify_fsbno(mp, cfg->logstart)) {
+		fprintf(stderr,
 _("Due to stripe alignment, the internal log start (%lld) cannot be aligned\n"
   "within an allocation group.\n"),
 			(long long) cfg->logstart);
@@ -3237,8 +3235,7 @@ _("Due to stripe alignment, the internal log start (%lld) cannot be aligned\n"
 	align_log_size(cfg, sunit, max_logblocks);
 
 	/* check the aligned log still starts and ends in the same AG. */
-	logend = cfg->logstart + cfg->logblocks - 1;
-	if (XFS_FSB_TO_AGNO(mp, cfg->logstart) != XFS_FSB_TO_AGNO(mp, logend)) {
+	if (!libxfs_verify_fsbext(mp, cfg->logstart, cfg->logblocks)) {
 		fprintf(stderr,
 _("Due to stripe alignment, the internal log size (%lld) is too large.\n"
   "Must fit within an allocation group.\n"),
@@ -3465,6 +3462,7 @@ start_superblock_setup(
 	sbp->sb_agblocks = (xfs_agblock_t)cfg->agsize;
 	sbp->sb_agblklog = (uint8_t)log2_roundup(cfg->agsize);
 	sbp->sb_agcount = (xfs_agnumber_t)cfg->agcount;
+	sbp->sb_dblocks = (xfs_rfsblock_t)cfg->dblocks;
 
 	sbp->sb_inodesize = (uint16_t)cfg->inodesize;
 	sbp->sb_inodelog = (uint8_t)cfg->inodelog;