diff options
author | Dan Williams <dan.j.williams@intel.com> | 2008-04-30 03:52:32 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 11:29:33 -0400 |
commit | 6bfe0b499082fd3950429017cd8ebf2a6c458aa5 (patch) | |
tree | 81476cf7f7ddbea135bdb93729e0bffae0e7c163 /include/linux | |
parent | 11e2ede0228ee0f81ccacd15894908c3bf241f73 (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')
-rw-r--r-- | include/linux/raid/md.h | 1 | ||||
-rw-r--r-- | include/linux/raid/md_k.h | 4 |
2 files changed, 5 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, | |||
94 | extern void md_do_sync(mddev_t *mddev); | 94 | extern void md_do_sync(mddev_t *mddev); |
95 | extern void md_new_event(mddev_t *mddev); | 95 | extern void md_new_event(mddev_t *mddev); |
96 | extern void md_allow_write(mddev_t *mddev); | 96 | extern void md_allow_write(mddev_t *mddev); |
97 | extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev); | ||
97 | 98 | ||
98 | #endif /* CONFIG_MD */ | 99 | #endif /* CONFIG_MD */ |
99 | #endif | 100 | #endif |
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 | |||
84 | #define AllReserved 6 /* If whole device is reserved for | 84 | #define AllReserved 6 /* If whole device is reserved for |
85 | * one array */ | 85 | * one array */ |
86 | #define AutoDetected 7 /* added by auto-detect */ | 86 | #define AutoDetected 7 /* added by auto-detect */ |
87 | #define Blocked 8 /* An error occured on an externally | ||
88 | * managed array, don't allow writes | ||
89 | * until it is cleared */ | ||
90 | wait_queue_head_t blocked_wait; | ||
87 | 91 | ||
88 | int desc_nr; /* descriptor index in the superblock */ | 92 | int desc_nr; /* descriptor index in the superblock */ |
89 | int raid_disk; /* role of device in array */ | 93 | int raid_disk; /* role of device in array */ |