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md: replace R5_WantPrexor with R5_WantDrain, add 'prexor' reconstruct_states

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From: Dan Williams <dan.j.williams@intel.com>

Currently ops_run_biodrain and other locations have extra logic to determine
which blocks are processed in the prexor and non-prexor cases.  This can be
eliminated if handle_write_operations5 flags the blocks to be processed in all
cases via R5_Wantdrain.  The presence of the prexor operation is tracked in
sh->reconstruct_state.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Dan Williams
2008-06-28 08:32:06 +10:00
committed by Neil Brown
parent 600aa10993
commit d8ee0728b5
2 changed files with 32 additions and 63 deletions
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6
include/linux/raid/raid5.h
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@ -187,8 +187,10 @@ enum check_states {
*/
enum reconstruct_states {
reconstruct_state_idle = 0,
reconstruct_state_prexor_drain_run, /* prexor-write */
reconstruct_state_drain_run, /* write */
reconstruct_state_run, /* expand */
reconstruct_state_prexor_drain_result,
reconstruct_state_drain_result,
reconstruct_state_result,
};
@ -258,9 +260,7 @@ struct r6_state {
#define R5_Wantfill 12 /* dev->toread contains a bio that needs
* filling
*/
#define R5_Wantprexor 13 /* distinguish blocks ready for rmw from
* other "towrites"
*/
#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
/*
* Write method
*/