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xen/blkfront: fix comment for need_copy

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The 'need_copy' is set when rq_data_dir(req) returns WRITE, in order to
copy the written data to persistent page.

".need_copy = rq_data_dir(req) && info->feature_persistent,"

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Fixes: c004a6fe0c ('block/xen-blkfront: Make it running on 64KB page granularity')
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220317220930.5698-1-dongli.zhang@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dongli Zhang 2022-03-17 15:09:30 -07:00 committed by Jens Axboe
parent 93b4e74789
commit 08719dd917
1 changed files with 1 additions and 1 deletions
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2
drivers/block/xen-blkfront.c
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@ -576,7 +576,7 @@ struct setup_rw_req {
struct blkif_request *ring_req;
grant_ref_t gref_head;
unsigned int id;
/* Only used when persistent grant is used and it's a read request */
/* Only used when persistent grant is used and it's a write request */
bool need_copy;
unsigned int bvec_off;
char *bvec_data;