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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/md/dm-sysfs.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/md/dm-sysfs.c')
-rw-r--r--kernel/drivers/md/dm-sysfs.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/kernel/drivers/md/dm-sysfs.c b/kernel/drivers/md/dm-sysfs.c
new file mode 100644
index 000000000..7e818f5f1
--- /dev/null
+++ b/kernel/drivers/md/dm-sysfs.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+ *
+ * This file is released under the GPL.
+ */
+
+#include <linux/sysfs.h>
+#include <linux/dm-ioctl.h>
+#include "dm.h"
+
+struct dm_sysfs_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct mapped_device *, char *);
+ ssize_t (*store)(struct mapped_device *, const char *, size_t count);
+};
+
+#define DM_ATTR_RO(_name) \
+struct dm_sysfs_attr dm_attr_##_name = \
+ __ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
+
+static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *page)
+{
+ struct dm_sysfs_attr *dm_attr;
+ struct mapped_device *md;
+ ssize_t ret;
+
+ dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
+ if (!dm_attr->show)
+ return -EIO;
+
+ md = dm_get_from_kobject(kobj);
+ if (!md)
+ return -EINVAL;
+
+ ret = dm_attr->show(md, page);
+ dm_put(md);
+
+ return ret;
+}
+
+#define DM_ATTR_RW(_name) \
+struct dm_sysfs_attr dm_attr_##_name = \
+ __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
+
+static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *page, size_t count)
+{
+ struct dm_sysfs_attr *dm_attr;
+ struct mapped_device *md;
+ ssize_t ret;
+
+ dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
+ if (!dm_attr->store)
+ return -EIO;
+
+ md = dm_get_from_kobject(kobj);
+ if (!md)
+ return -EINVAL;
+
+ ret = dm_attr->store(md, page, count);
+ dm_put(md);
+
+ return ret;
+}
+
+static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
+{
+ if (dm_copy_name_and_uuid(md, buf, NULL))
+ return -EIO;
+
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
+{
+ if (dm_copy_name_and_uuid(md, NULL, buf))
+ return -EIO;
+
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
+{
+ sprintf(buf, "%d\n", dm_suspended_md(md));
+
+ return strlen(buf);
+}
+
+static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
+{
+ sprintf(buf, "%d\n", dm_use_blk_mq(md));
+
+ return strlen(buf);
+}
+
+static DM_ATTR_RO(name);
+static DM_ATTR_RO(uuid);
+static DM_ATTR_RO(suspended);
+static DM_ATTR_RO(use_blk_mq);
+static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
+
+static struct attribute *dm_attrs[] = {
+ &dm_attr_name.attr,
+ &dm_attr_uuid.attr,
+ &dm_attr_suspended.attr,
+ &dm_attr_use_blk_mq.attr,
+ &dm_attr_rq_based_seq_io_merge_deadline.attr,
+ NULL,
+};
+
+static const struct sysfs_ops dm_sysfs_ops = {
+ .show = dm_attr_show,
+ .store = dm_attr_store,
+};
+
+static struct kobj_type dm_ktype = {
+ .sysfs_ops = &dm_sysfs_ops,
+ .default_attrs = dm_attrs,
+ .release = dm_kobject_release,
+};
+
+/*
+ * Initialize kobj
+ * because nobody using md yet, no need to call explicit dm_get/put
+ */
+int dm_sysfs_init(struct mapped_device *md)
+{
+ return kobject_init_and_add(dm_kobject(md), &dm_ktype,
+ &disk_to_dev(dm_disk(md))->kobj,
+ "%s", "dm");
+}
+
+/*
+ * Remove kobj, called after all references removed
+ */
+void dm_sysfs_exit(struct mapped_device *md)
+{
+ struct kobject *kobj = dm_kobject(md);
+ kobject_put(kobj);
+ wait_for_completion(dm_get_completion_from_kobject(kobj));
+}