[PATCH 27/47] xfs_io: support scrubbing rtgroup metadata paths

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Support scrubbing the metadata directory path of an rtgroup metadata
file.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 io/scrub.c        |   41 +++++++++++++++++++++++++++++++++++------
 man/man8/xfs_io.8 |    3 ++-
 2 files changed, 37 insertions(+), 7 deletions(-)


diff --git a/io/scrub.c b/io/scrub.c
index e9254c7882a..72296cbe86a 100644
--- a/io/scrub.c
+++ b/io/scrub.c
@@ -136,21 +136,23 @@ parse_metapath(
 	int		argc,
 	char		**argv,
 	int		optind,
-	__u64		*ino)
+	__u64		*ino,
+	__u32		*group)
 {
 	char		*p;
 	unsigned long long control;
+	unsigned long	control2 = 0;
 	int		i;
 
-	if (optind != argc - 1) {
+	if (optind != argc - 1 && optind != argc - 2) {
 		fprintf(stderr, _("Must specify metapath number.\n"));
 		return false;
 	}
 
 	for (i = 0; i < XFS_SCRUB_METAPATH_NR; i++) {
 		if (!strcmp(argv[optind], xfrog_metapaths[i].name)) {
-			*ino = i;
-			return true;
+			control = i;
+			goto find_group;
 		}
 	}
 
@@ -161,7 +163,32 @@ parse_metapath(
 		return false;
 	}
 
+find_group:
+	if (xfrog_metapaths[*ino].group == XFROG_SCRUB_GROUP_RTGROUP) {
+		if (optind == argc - 1) {
+			fprintf(stderr,
+_("%s: Metapath requires a group number.\n"),
+					xfrog_metapaths[*ino].name);
+			return false;
+		}
+		control2 = strtoul(argv[optind + 1], &p, 0);
+		if (*p != '\0') {
+			fprintf(stderr,
+ _("Bad group number '%s'.\n"),
+				argv[optind + 1]);
+			return false;
+		}
+	} else {
+		if (optind == argc - 2) {
+			fprintf(stderr,
+_("%s: Metapath does not take a second argument.\n"),
+					xfrog_metapaths[*ino].name);
+			return false;
+		}
+	}
+
 	*ino = control;
+	*group = control2;
 	return true;
 }
 
@@ -237,7 +264,8 @@ parse_args(
 
 	switch (d->group) {
 	case XFROG_SCRUB_GROUP_METAPATH:
-		if (!parse_metapath(argc, argv, optind, &meta->sm_ino)) {
+		if (!parse_metapath(argc, argv, optind, &meta->sm_ino,
+							&meta->sm_agno)) {
 			exitcode = 1;
 			return command_usage(cmdinfo);
 		}
@@ -587,7 +615,8 @@ scrubv_f(
 
 	switch (group) {
 	case XFROG_SCRUB_GROUP_METAPATH:
-		if (!parse_metapath(argc, argv, optind, &vhead->svh_ino)) {
+		if (!parse_metapath(argc, argv, optind, &vhead->svh_ino,
+							&vhead->svh_agno)) {
 			exitcode = 1;
 			return command_usage(&scrubv_cmd);
 		}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 6cf4b9e32e5..f94de0ce40f 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -1447,7 +1447,7 @@ Currently supported versions are 1 and 5.
 .RE
 .PD
 .TP
-.BI "scrub " type " [ " agnumber " | " rgnumber " | " "ino" " " "gen" " | " metapath " ]"
+.BI "scrub " type " [ " agnumber " | " rgnumber " | " "ino" " " "gen" " | " metapath " [ " rgnumber " ] ]"
 Scrub internal XFS filesystem metadata.  The
 .BI type
 parameter specifies which type of metadata to scrub.
@@ -1456,6 +1456,7 @@ For realtime group metadata, one rtgroup number must be specified.
 For file metadata, the scrub is applied to the open file unless the
 inode number and generation number are specified.
 For metapath, the name of a file or a raw number must be specified.
+If the metapath file is a per-rtgroup file, the group number must be specified.
 .RE
 .PD
 .TP