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| author | Dan Williams <dan.j.williams@intel.com> | 2008-04-30 00:52:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:33 -0700 |
| commit | 6bfe0b499082fd3950429017cd8ebf2a6c458aa5 (patch) | |
| tree | 81476cf7f7ddbea135bdb93729e0bffae0e7c163 /include/linux/raid/md_k.h | |
| parent | 11e2ede0228ee0f81ccacd15894908c3bf241f73 (diff) | |
| download | lwn-6bfe0b499082fd3950429017cd8ebf2a6c458aa5.tar.gz lwn-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.h | 4 |
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 */ |