path: root/include/linux/raid/md_k.h
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authorNeilBrown <neilb@suse.de>2006-03-27 01:18:08 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:45:01 -0800
commit7ecaa1e6a1ad69862e9980b6c777e11f26c4782d (patch)
tree3cbd64ebc2a45f6b5ac45b0305fd3cf2c6916070 /include/linux/raid/md_k.h
parent[PATCH] md: Allow stripes to be expanded in preparation for expanding an array (diff)
[PATCH] md: Infrastructure to allow normal IO to continue while array is expanding
We need to allow that different stripes are of different effective sizes, and use the appropriate size. Also, when a stripe is being expanded, we must block any IO attempts until the stripe is stable again. Key elements in this change are: - each stripe_head gets a 'disk' field which is part of the key, thus there can sometimes be two stripe heads of the same area of the array, but covering different numbers of devices. One of these will be marked STRIPE_EXPANDING and so won't accept new requests. - conf->expand_progress tracks how the expansion is progressing and is used to determine whether the target part of the array has been expanded yet or not. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/raid/md_k.h')
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