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raid5: copy write hint from origin bio to stripe

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Store write hint from original bio in stripe head so it can be assigned
to bio sent to each RAID device.

Signed-off-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Mariusz Dabrowski 2018-04-19 19:28:10 +02:00 committed by Shaohua Li
parent 011abdc9df
commit 2cd259a77d
2 changed files with 7 additions and 0 deletions
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6
drivers/md/raid5.c
View File

@ -1139,6 +1139,9 @@ again:
bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
bi->bi_io_vec[0].bv_offset = 0;
bi->bi_iter.bi_size = STRIPE_SIZE;
bi->bi_write_hint = sh->dev[i].write_hint;
if (!rrdev)
sh->dev[i].write_hint = RWF_WRITE_LIFE_NOT_SET;
/*
* If this is discard request, set bi_vcnt 0. We don't
* want to confuse SCSI because SCSI will replace payload
@ -1190,6 +1193,8 @@ again:
rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
rbi->bi_io_vec[0].bv_offset = 0;
rbi->bi_iter.bi_size = STRIPE_SIZE;
rbi->bi_write_hint = sh->dev[i].write_hint;
sh->dev[i].write_hint = RWF_WRITE_LIFE_NOT_SET;
/*
* If this is discard request, set bi_vcnt 0. We don't
* want to confuse SCSI because SCSI will replace payload
@ -3204,6 +3209,7 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
(unsigned long long)sh->sector);
spin_lock_irq(&sh->stripe_lock);
sh->dev[dd_idx].write_hint = bi->bi_write_hint;
/* Don't allow new IO added to stripes in batch list */
if (sh->batch_head)
goto overlap;

1
drivers/md/raid5.h
View File

@ -257,6 +257,7 @@ struct stripe_head {
sector_t sector; /* sector of this page */
unsigned long flags;
u32 log_checksum;
unsigned short write_hint;
} dev[1]; /* allocated with extra space depending of RAID geometry */
};