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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.h
parent11e2ede0228ee0f81ccacd15894908c3bf241f73 (diff)
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.h')
-rw-r--r--include/linux/raid/md.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index 8ab630b67fcc..81a1a02d4566 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -94,6 +94,7 @@ extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
extern void md_do_sync(mddev_t *mddev);
extern void md_new_event(mddev_t *mddev);
extern void md_allow_write(mddev_t *mddev);
+extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
#endif /* CONFIG_MD */
#endif