From: Darrick J. Wong <djwong@kernel.org>
Date: Tue, 20 Jan 2026 17:51:04 +0000 (-0800)
Subject: xfs_logprint: print log data to the screen in host-endian order
X-Git-Tag: v6.19.0~29
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=9547c3f44e641ca15eec27af925d85c3986f9c62;p=xfsprogs-dev.git

xfs_logprint: print log data to the screen in host-endian order

Add a cli option so that users won't have to byteswap u32 values when
they're digging through broken logs on little-endian systems.  Also make
it more obvious which column is the offset and which are the byte(s).

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/logprint/log_print_all.c b/logprint/log_print_all.c
index 0afad597..5a01e049 100644
--- a/logprint/log_print_all.c
+++ b/logprint/log_print_all.c
@@ -55,8 +55,9 @@ xlog_recover_print_data(
 
 		while (j < nums) {
 			if ((j % 8) == 0)
-				printf("%2x ", j);
-			printf("%8x ", *dp);
+				printf("%2x: ", j);
+			printf("%08x ", print_host_endian ? be32_to_cpu(*dp) :
+							    *dp);
 			dp++;
 			j++;
 			if ((j % 8) == 0)
diff --git a/logprint/logprint.c b/logprint/logprint.c
index 7c69cdcc..34df3400 100644
--- a/logprint/logprint.c
+++ b/logprint/logprint.c
@@ -24,6 +24,7 @@ int	print_buffer;
 int	print_overwrite;
 int     print_no_data;
 int     print_no_print;
+int	print_host_endian;
 static int	print_operation = OP_PRINT;
 static struct libxfs_init x;
 
@@ -37,6 +38,7 @@ Options:\n\
     -d	            dump the log in log-record format\n\
     -e	            exit when an error is found in the log\n\
     -f	            specified device is actually a file\n\
+    -h		    print hex data in host-endian order\n\
     -l <device>     filename of external log\n\
     -n	            don't try and interpret log data\n\
     -o	            print buffer data in hex\n\
@@ -171,6 +173,9 @@ main(int argc, char **argv)
 				x.log.name = optarg;
 				x.log.isfile = 1;
 				break;
+			case 'h':
+				print_host_endian = 1;
+				break;
 			case 'i':
 				print_inode++;
 				break;
diff --git a/logprint/logprint.h b/logprint/logprint.h
index aa90068c..2ba868a9 100644
--- a/logprint/logprint.h
+++ b/logprint/logprint.h
@@ -16,6 +16,7 @@ extern int	print_transactions;
 extern int	print_overwrite;
 extern int	print_no_data;
 extern int	print_no_print;
+extern int	print_host_endian;
 
 /* exports */
 extern time64_t xlog_extract_dinode_ts(const xfs_log_timestamp_t);
diff --git a/man/man8/xfs_logprint.8 b/man/man8/xfs_logprint.8
index 16e881ee..d64af596 100644
--- a/man/man8/xfs_logprint.8
+++ b/man/man8/xfs_logprint.8
@@ -76,6 +76,10 @@ This might happen if an image copy of a filesystem has been made into
 an ordinary file with
 .BR xfs_copy (8).
 .TP
+.B \-h
+Print u32 hex dump data in host-endian order.
+The default is to print without any endian decoding.
+.TP
 .BI \-l " logdev"
 External log device. Only for those filesystems which use an external log.
 .TP