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[PATCH] md: improve raid10 "IO Barrier" concept

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raid10 needs to put up a barrier to new requests while it does resync or other
background recovery.  The code for this is currently open-coded, slighty
obscure by its use of two waitqueues, and not documented.

This patch gathers all the related code into 4 functions, and includes a
comment which (hopefully) explains what is happening.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-01-06 00:20:13 -08:00 • committed by Linus Torvalds
parent 17999be4aa
commit 0a27ec96b6
2 changed files with 81 additions and 58 deletions
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4
include/linux/raid/raid10.h
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@ -39,11 +39,11 @@ struct r10_private_data_s {
spinlock_t resync_lock;
int nr_pending;
int nr_waiting;
int barrier;
sector_t next_resync;
wait_queue_head_t wait_idle;
wait_queue_head_t wait_resume;
wait_queue_head_t wait_barrier;
mempool_t *r10bio_pool;
mempool_t *r10buf_pool;