Writing major:minor to md/new_dev will bind that device to the
array.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
### Diffstat output
./Documentation/md.txt | 8 ++++++
./drivers/md/md.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+)
diff ./Documentation/md.txt~current~ ./Documentation/md.txt
--- ./Documentation/md.txt~current~ 2005-12-12 11:57:28.000000000 +1100
+++ ./Documentation/md.txt 2005-12-12 11:57:31.000000000 +1100
@@ -200,6 +200,14 @@ All md devices contain:
This can be written only while the array is being assembled, not
after it is started.
+ new_dev
+ This file can be written but not read. The value written should
+ be a block device number as major:minor. e.g. 8:0
+ This will cause that device to be attached to the array, if it is
+ available. It will then appear at md/dev-XXX (depending on the
+ name of the device) and further configuration is then possible.
+
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX
diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~ 2005-12-12 11:57:28.000000000 +1100
+++ ./drivers/md/md.c 2005-12-12 11:57:49.000000000 +1100
@@ -1987,6 +1987,65 @@ chunk_size_store(mddev_t *mddev, const c
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
+static ssize_t
+null_show(mddev_t *mddev, char *page)
+{
+ return -EINVAL;
+}
+
+static ssize_t
+new_dev_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ /* buf must be %d:%d\n? giving major and minor numbers */
+ /* The new device is added to the array.
+ * If the array has a persistent superblock, we read the
+ * superblock to initialise info and check validity.
+ * Otherwise, only checking done is that in bind_rdev_to_array,
+ * which mainly checks size.
+ */
+ char *e;
+ int major = simple_strtoul(buf, &e, 10);
+ int minor;
+ dev_t dev;
+ mdk_rdev_t *rdev;
+ int err;
+
+ if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
+ return -EINVAL;
+ minor = simple_strtoul(e+1, &e, 10);
+ if (*e && *e != '\n')
+ return -EINVAL;
+ dev = MKDEV(major, minor);
+ if (major != MAJOR(dev) ||
+ minor != MINOR(dev))
+ return -EOVERFLOW;
+
+
+ if (mddev->persistent) {
+ rdev = md_import_device(dev, mddev->major_version,
+ mddev->minor_version);
+ if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
+ mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
+ mdk_rdev_t, same_set);
+ err = super_types[mddev->major_version]
+ .load_super(rdev, rdev0, mddev->minor_version);
+ if (err < 0)
+ goto out;
+ }
+ } else
+ rdev = md_import_device(dev, -1, -1);
+
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+ err = bind_rdev_to_array(rdev, mddev);
+ out:
+ if (err)
+ export_rdev(rdev);
+ return err ? err : len;
+}
+
+static struct md_sysfs_entry md_new_device =
+__ATTR(new_dev, 0200, null_show, new_dev_store);
static ssize_t
size_show(mddev_t *mddev, char *page)
@@ -2144,6 +2203,7 @@ static struct attribute *md_default_attr
&md_chunk_size.attr,
&md_size.attr,
&md_metadata.attr,
+ &md_new_device.attr,
NULL,
};
-
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