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authorNeilBrown <neilb@suse.de>2009-01-09 08:31:10 +1100
committerNeilBrown <neilb@suse.de>2009-01-09 08:31:10 +1100
commitefeb53c0e57213e843b7ef3cc6ebcdea7d6186ac (patch)
treeef580effd8809fb0bc5d6ffa6f3b8abaa9180539 /include/linux/raid/md_k.h
parentmd: make devices disappear when they are no longer needed. (diff)
downloadlinux-dev-efeb53c0e57213e843b7ef3cc6ebcdea7d6186ac.tar.xz
linux-dev-efeb53c0e57213e843b7ef3cc6ebcdea7d6186ac.zip
md: Allow md devices to be created by name.
Using sequential numbers to identify md devices is somewhat artificial. Using names can be a lot more user-friendly. Also, creating md devices by opening the device special file is a bit awkward. So this patch provides a new option for creating and naming devices. Writing a name such as "md_home" to /sys/modules/md_mod/parameters/new_array will cause an array with that name to be created. It will appear in /sys/block/ /proc/partitions and /proc/mdstat as 'md_home'. It will have an arbitrary minor number allocated. md devices that a created by an open are destroyed on the last close when the device is inactive. For named md devices, they will not be destroyed until the array is explicitly stopped, either with the STOP_ARRAY ioctl or by writing 'clear' to /sys/block/md_XXXX/md/array_state. The name of the array must start 'md_' to avoid conflict with other devices. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include/linux/raid/md_k.h')
-rw-r--r--include/linux/raid/md_k.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index e3d17c7f954e..dac4217194b8 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -139,6 +139,7 @@ struct mddev_s
struct kobject kobj;
int hold_active;
#define UNTIL_IOCTL 1
+#define UNTIL_STOP 2
/* Superblock information */
int major_version,