[PATCH 2/2] xfsprogs: don't warn about log sunit size if it was auto-discovered

[Eric Sandeen <sandeen@sandeen.net>]

Today, users doing a bare mkfs on storage with a large default
stripe size may be surprised to get this warning:

 log stripe unit (%d bytes) is too large (maximum is 256KiB
 log stripe unit adjusted to 32KiB

through no fault of their own.  The fallback is appropriate
and harmless, and there's no need to warn about this in the
defaults case.

However, we keep the warning if a large log stripe unit was
specified by the user on the commandline.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index a0fed31..66711cb 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -946,6 +946,8 @@ main(
 	int			logversion;
 	int			lvflag;
 	int			lsflag;
+	int			lsuflag;
+	int			lsunitflag;
 	int			lsectorlog;
 	int			lsectorsize;
 	int			lslflag;
@@ -1004,7 +1006,7 @@ main(
 	sectorsize = lsectorsize = XFS_MIN_SECTORSIZE;
 	agsize = daflag = dasize = dblocks = 0;
 	ilflag = imflag = ipflag = isflag = 0;
-	liflag = laflag = lsflag = ldflag = lvflag = 0;
+	liflag = laflag = lsflag = lsuflag = lsunitflag = ldflag = lvflag = 0;
 	loginternal = 1;
 	logversion = 2;
 	logagno = logblocks = rtblocks = rtextblocks = 0;
@@ -1400,6 +1402,7 @@ main(
 						respec('l', lopts, L_SU);
 					lsu = cvtnum(
 						blocksize, sectorsize, value);
+					lsuflag = 1;
 					break;
 				case L_SUNIT:
 					if (!value || *value == '\0')
@@ -1412,6 +1415,7 @@ main(
 						usage();
 					}
 					lsunit = cvtnum(0, 0, value);
+					lsunitflag = 1;
 					break;
 				case L_NAME:
 				case L_DEV:
@@ -2379,11 +2383,15 @@ an AG size that is one stripe unit smaller, for example %llu.\n"),
 	}
 
 	if (logversion == 2 && (lsunit * blocksize) > 256 * 1024) {
-		fprintf(stderr,
+		/* Warn only if specified on commandline */
+		if (lsuflag || lsunitflag) {
+			fprintf(stderr,
 	_("log stripe unit (%d bytes) is too large (maximum is 256KiB)\n"),
-			(lsunit * blocksize));
+				(lsunit * blocksize));
+			fprintf(stderr,
+	_("log stripe unit adjusted to 32KiB\n"));
+		}
 		lsunit = (32 * 1024) >> blocklog;
-		fprintf(stderr, _("log stripe unit adjusted to 32KiB\n"));
 	}
 
 	min_logblocks = max_trans_res(crcs_enabled, dirversion,

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