[PATCH 37/38] xfs_io: create magic command to disable verity

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Create a secret command to turn off fsverity if we need to.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 io/scrub.c        |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 man/man8/xfs_io.8 |    3 +++
 2 files changed, 50 insertions(+)


diff --git a/io/scrub.c b/io/scrub.c
index dc40afdfb36f..8a4a7e2fc3af 100644
--- a/io/scrub.c
+++ b/io/scrub.c
@@ -19,6 +19,7 @@
 static struct cmdinfo scrub_cmd;
 static struct cmdinfo repair_cmd;
 static const struct cmdinfo scrubv_cmd;
+static const struct cmdinfo noverity_cmd;
 
 static void
 scrub_help(void)
@@ -356,6 +357,7 @@ scrub_init(void)
 
 	add_command(&scrub_cmd);
 	add_command(&scrubv_cmd);
+	add_command(&noverity_cmd);
 }
 
 static void
@@ -730,3 +732,48 @@ static const struct cmdinfo scrubv_cmd = {
 	.oneline	= N_("vectored metadata scrub"),
 	.help		= scrubv_help,
 };
+
+static void
+noverity_help(void)
+{
+	printf(_(
+"\n"
+" Disable fsverity on a file.\n"));
+}
+
+#ifndef FS_IOC_DISABLE_VERITY
+# define FS_IOC_DISABLE_VERITY _IO('f', 136)
+#endif
+
+static int
+noverity_f(
+	int		argc,
+	char		**argv)
+{
+	int		c;
+	int		error;
+
+	while ((c = getopt(argc, argv, "")) != EOF) {
+		switch (c) {
+		default:
+			noverity_help();
+			return 0;
+		}
+	}
+
+	error = ioctl(file->fd, FS_IOC_DISABLE_VERITY);
+	if (error)
+		perror("noverity");
+
+	return 0;
+}
+
+static const struct cmdinfo noverity_cmd = {
+	.name		= "noverity",
+	.cfunc		= noverity_f,
+	.argmin		= -1,
+	.argmax		= -1,
+	.flags		= CMD_NOMAP_OK,
+	.oneline	= N_("disable fsverity"),
+	.help		= noverity_help,
+};
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 4991ad471bd7..013750faa113 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -1093,6 +1093,9 @@ Check parameters without changing anything.
 Do not print timing information at all.
 .PD
 .RE
+.TP
+.B noverity
+Disable fs-verity on this file.
 
 .SH MEMORY MAPPED I/O COMMANDS
 .TP