[PATCH 1/4] libfrog: define a autofsck filesystem property

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Now that we have the ability to set properties on filesystems, create an
"autofsck" property so that sysadmins can control background xfs_scrub
behaviors.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 libfrog/fsproperties.c |   38 ++++++++++++++++++++++++++++++++++++++
 libfrog/fsproperties.h |   13 +++++++++++++
 2 files changed, 51 insertions(+)


diff --git a/libfrog/fsproperties.c b/libfrog/fsproperties.c
index c317d15c1..72485f627 100644
--- a/libfrog/fsproperties.c
+++ b/libfrog/fsproperties.c
@@ -29,11 +29,49 @@ __fsprops_lookup(
 #define fsprops_lookup(values, value) \
 	__fsprops_lookup((values), ARRAY_SIZE(values), (value))
 
+/* Automatic background fsck fs property */
+
+static const char *fsprop_autofsck_values[] = {
+	[FSPROP_AUTOFSCK_UNSET]		= NULL,
+	[FSPROP_AUTOFSCK_NONE]		= "none",
+	[FSPROP_AUTOFSCK_CHECK]		= "check",
+	[FSPROP_AUTOFSCK_OPTIMIZE]	= "optimize",
+	[FSPROP_AUTOFSCK_REPAIR]	= "repair",
+};
+
+/* Convert the autofsck property enum to a string. */
+const char *
+fsprop_autofsck_write(
+	enum fsprop_autofsck	x)
+{
+	if (x <= FSPROP_AUTOFSCK_UNSET ||
+	    x >= ARRAY_SIZE(fsprop_autofsck_values))
+		return NULL;
+	return fsprop_autofsck_values[x];
+}
+
+/*
+ * Turn a autofsck value string into an enumerated value, or _UNSET if it's
+ * not recognized.
+ */
+enum fsprop_autofsck
+fsprop_autofsck_read(
+	const char	*value)
+{
+	int ret = fsprops_lookup(fsprop_autofsck_values, value);
+	if (ret < 0)
+		return FSPROP_AUTOFSCK_UNSET;
+	return ret;
+}
+
 /* Return true if a fs property name=value tuple is allowed. */
 bool
 fsprop_validate(
 	const char	*name,
 	const char	*value)
 {
+	if (!strcmp(name, FSPROP_AUTOFSCK_NAME))
+		return fsprops_lookup(fsprop_autofsck_values, value) >= 0;
+
 	return true;
 }
diff --git a/libfrog/fsproperties.h b/libfrog/fsproperties.h
index b1ac4cdd7..11d6530bc 100644
--- a/libfrog/fsproperties.h
+++ b/libfrog/fsproperties.h
@@ -50,4 +50,17 @@ bool fsprop_validate(const char *name, const char *value);
 
 /* Specific Filesystem Properties */
 
+#define FSPROP_AUTOFSCK_NAME		"autofsck"
+
+enum fsprop_autofsck {
+	FSPROP_AUTOFSCK_UNSET = 0,	/* do not set property */
+	FSPROP_AUTOFSCK_NONE,		/* no background scrubs */
+	FSPROP_AUTOFSCK_CHECK,		/* allow only background checking */
+	FSPROP_AUTOFSCK_OPTIMIZE,	/* allow background optimization */
+	FSPROP_AUTOFSCK_REPAIR,		/* allow background repair & optimization */
+};
+
+const char *fsprop_autofsck_write(enum fsprop_autofsck x);
+enum fsprop_autofsck fsprop_autofsck_read(const char *value);
+
 #endif /* __LIBFROG_FSPROPERTIES_H__ */