staging/lustre: Generic helpers for sysfs

Add generic helpers to allow displaying oof lustre-specific values
in /sys/fs/lustre

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/include/lprocfs_status.h b/drivers/staging/lustre/lustre/include/lprocfs_status.h
index d030847e51bada4637fbbc11abfa3492033bc59c..37f00e4296145ab862687771858515357f8d9545 100644 (file)
--- a/drivers/staging/lustre/lustre/include/lprocfs_status.h
+++ b/drivers/staging/lustre/lustre/include/lprocfs_status.h
@@ -742,6 +742,27 @@ static struct file_operations name##_fops = {                              \
                .release = lprocfs_single_release,                      \
        }
 
+struct lustre_attr {
+       struct attribute attr;
+       ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
+                       char *buf);
+       ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
+                        const char *buf, size_t len);
+};
+
+#define LUSTRE_ATTR(name, mode, show, store) \
+static struct lustre_attr lustre_attr_##name = __ATTR(name, mode, show, store)
+
+#define LUSTRE_RO_ATTR(name) LUSTRE_ATTR(name, 0444, name##_show, NULL)
+#define LUSTRE_RW_ATTR(name) LUSTRE_ATTR(name, 0644, name##_show, name##_store)
+
+ssize_t lustre_attr_show(struct kobject *kobj, struct attribute *attr,
+                        char *buf);
+ssize_t lustre_attr_store(struct kobject *kobj, struct attribute *attr,
+                         const char *buf, size_t len);
+
+extern const struct sysfs_ops lustre_sysfs_ops;
+
 /* lproc_ptlrpc.c */
 struct ptlrpc_request;
 extern void target_print_req(void *seq_file, struct ptlrpc_request *req);

diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
index c988be4fc04930c9d3152a540bedd3190d591c8b..916d0606b2e4c90f4c90d9d4e91cc0fa65916a52 100644 (file)
--- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
+++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
@@ -2056,3 +2056,27 @@ int lprocfs_obd_rd_max_pages_per_rpc(struct seq_file *m, void *data)
 EXPORT_SYMBOL(lprocfs_obd_rd_max_pages_per_rpc);
 
 #endif
+
+ssize_t lustre_attr_show(struct kobject *kobj,
+                        struct attribute *attr, char *buf)
+{
+       struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
+
+       return a->show ? a->show(kobj, attr, buf) : 0;
+}
+EXPORT_SYMBOL_GPL(lustre_attr_show);
+
+ssize_t lustre_attr_store(struct kobject *kobj, struct attribute *attr,
+                         const char *buf, size_t len)
+{
+       struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
+
+       return a->store ? a->store(kobj, attr, buf, len) : len;
+}
+EXPORT_SYMBOL_GPL(lustre_attr_store);
+
+const struct sysfs_ops lustre_sysfs_ops = {
+       .show  = lustre_attr_show,
+       .store = lustre_attr_store,
+};
+EXPORT_SYMBOL_GPL(lustre_sysfs_ops);