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

[Eric Sandeen <sandeen@xxxxxxxxxxx>]

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@xxxxxxxxxx>
---

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,