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authorBrian Foster <bfoster@redhat.com>2014-09-09 05:52:42 +0400
committerDave Chinner <david@fromorbit.com>2014-09-09 05:52:42 +0400
commit65b65735fede29b516fed1d8c2391e8bc373b805 (patch)
tree841419a2f24fe12359ff4602ae26885667891efd /fs/xfs/xfs_sysfs.c
parente1b05723ed834090caab56866adc05bce31c9bdd (diff)
downloadlinux-65b65735fede29b516fed1d8c2391e8bc373b805.tar.xz
xfs: add debug sysfs attribute set
Create a top-level debug directory for global debug sysfs attributes. This directory is added and removed on XFS module initialization and removal respectively for DEBUG mode kernels only. It typically resides at /sys/fs/xfs/debug. It is located at the top level of the xfs sysfs hierarchy as attributes might define global behavior or behavior that must be configured before an xfs mount is available (e.g., log recovery behavior). Define the global debug kobject that represents the debug sysfs directory and add generic attribute show/store helpers to support future attributes. No debug attributes are exported as of yet. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_sysfs.c')
-rw-r--r--fs/xfs/xfs_sysfs.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 9835139ce1ec..32ddf0c8c50e 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -51,6 +51,49 @@ struct kobj_type xfs_mp_ktype = {
.release = xfs_sysfs_release,
};
+#ifdef DEBUG
+/* debug */
+
+static struct attribute *xfs_dbg_attrs[] = {
+ NULL,
+};
+
+STATIC ssize_t
+xfs_dbg_show(
+ struct kobject *kobject,
+ struct attribute *attr,
+ char *buf)
+{
+ struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
+
+ return xfs_attr->show ? xfs_attr->show(buf, NULL) : 0;
+}
+
+STATIC ssize_t
+xfs_dbg_store(
+ struct kobject *kobject,
+ struct attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
+
+ return xfs_attr->store ? xfs_attr->store(buf, count, NULL) : 0;
+}
+
+static struct sysfs_ops xfs_dbg_ops = {
+ .show = xfs_dbg_show,
+ .store = xfs_dbg_store,
+};
+
+struct kobj_type xfs_dbg_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_dbg_ops,
+ .default_attrs = xfs_dbg_attrs,
+};
+
+#endif /* DEBUG */
+
/* xlog */
STATIC ssize_t