This is meant for external metadata arrays, to pass the location of the
superblock to the kernel.
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@xxxxxxxxx>
---
drivers/md/md.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5a14f8e..7049833 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3204,6 +3204,27 @@ static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
static struct rdev_sysfs_entry rdev_unack_bad_blocks =
__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
+static ssize_t
+sb_start_show(struct md_rdev *rdev, char *page)
+{
+ return sprintf(page, "%llu\n", (unsigned long long)rdev->sb_start);
+}
+
+static ssize_t
+sb_start_store(struct md_rdev *rdev, const char *buf, size_t len)
+{
+ unsigned long long sb_start;
+ if (kstrtoull(buf, 10, &sb_start) < 0)
+ return -EINVAL;
+ if (!rdev->mddev->external)
+ return -EBUSY;
+ rdev->sb_start = sb_start;
+ return len;
+}
+
+static struct rdev_sysfs_entry rdev_sb_start =
+__ATTR(sb_start, S_IRUGO|S_IWUSR, sb_start_show, sb_start_store);
+
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_errors.attr,
@@ -3214,6 +3235,7 @@ static struct attribute *rdev_default_attrs[] = {
&rdev_recovery_start.attr,
&rdev_bad_blocks.attr,
&rdev_unack_bad_blocks.attr,
+ &rdev_sb_start.attr,
NULL,
};
static ssize_t
--
2.10.1
--
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