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authorDan Williams <dan.j.williams@intel.com>2008-04-30 00:52:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:33 -0700
commit6bfe0b499082fd3950429017cd8ebf2a6c458aa5 (patch)
tree81476cf7f7ddbea135bdb93729e0bffae0e7c163 /include/linux/raid/md_k.h
parentmd: prevent duplicates in bind_rdev_to_array (diff)
downloadlinux-dev-6bfe0b499082fd3950429017cd8ebf2a6c458aa5.tar.xz
linux-dev-6bfe0b499082fd3950429017cd8ebf2a6c458aa5.zip
md: support blocking writes to an array on device failure
Allows a userspace metadata handler to take action upon detecting a device failure. Based on an original patch by Neil Brown. Changes: -added blocked_wait waitqueue to rdev -don't qualify Blocked with Faulty always let userspace block writes -added md_wait_for_blocked_rdev to wait for the block device to be clear, if userspace misses the notification another one is sent every 5 seconds -set MD_RECOVERY_NEEDED after clearing "blocked" -kill DoBlock flag, just test mddev->external Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/raid/md_k.h')
-rw-r--r--include/linux/raid/md_k.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 7bb6d1abf71e..812ffa590cff 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -84,6 +84,10 @@ struct mdk_rdev_s
#define AllReserved 6 /* If whole device is reserved for
* one array */
#define AutoDetected 7 /* added by auto-detect */
+#define Blocked 8 /* An error occured on an externally
+ * managed array, don't allow writes
+ * until it is cleared */
+ wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */
int raid_disk; /* role of device in array */