[PATCH] md: Support suspending of IO to regions of an md array

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This allows user-space to access data safely.  This is needed for raid5
reshape as user-space needs to take a backup of the first few stripes before
allowing reshape to commence.

It will also be useful in cluster-aware raid1 configurations so that all
cluster members can leave a section of the array untouched while a
resync/recovery happens.

A 'start' and 'end' of the suspended range are written to 2 sysfs attributes.
Note that only one range can be suspended at a time.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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NeilBrown 2006-03-27 01:18:14 -08:00 • committed by Linus Torvalds

parent 16484bf596

commit e464eafdb4

3 changed files with 77 additions and 0 deletions

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4

include/linux/raid/md_k.h

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