From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Ming Lei <ming.lei@redhat.com>
Subject: [PATCH 1/8] loop: move flush_dcache_page to ->complete of request
Date: Mon, 25 Oct 2021 17:44:30 +0800 [thread overview]
Message-ID: <20211025094437.2837701-2-ming.lei@redhat.com> (raw)
In-Reply-To: <20211025094437.2837701-1-ming.lei@redhat.com>
Prepare for unifying backing buffered IO code, so move
flush_dcache_page() into ->complete() of read request.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/block/loop.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 7bf4686af774..8f140d637435 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -405,8 +405,6 @@ static int lo_read_simple(struct loop_device *lo, struct request *rq,
if (len < 0)
return len;
- flush_dcache_page(bvec.bv_page);
-
if (len != bvec.bv_len) {
struct bio *bio;
@@ -507,11 +505,24 @@ static int lo_req_flush(struct loop_device *lo, struct request *rq)
return ret;
}
+static void lo_flush_dcache_for_read(struct request *rq)
+{
+ struct bio_vec bvec;
+ struct req_iterator iter;
+
+ rq_for_each_segment(bvec, rq, iter)
+ flush_dcache_page(bvec.bv_page);
+}
+
static void lo_complete_rq(struct request *rq)
{
struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
blk_status_t ret = BLK_STS_OK;
+ /* Kernel wrote to our pages, call flush_dcache_page */
+ if (req_op(rq) == REQ_OP_READ && !cmd->use_aio && cmd->ret >= 0)
+ lo_flush_dcache_for_read(rq);
+
if (!cmd->use_aio || cmd->ret < 0 || cmd->ret == blk_rq_bytes(rq) ||
req_op(rq) != REQ_OP_READ) {
if (cmd->ret < 0)
--
2.31.1
next prev parent reply other threads:[~2021-10-25 9:47 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 9:44 [PATCH 0/8] loop: improve dio on backing file Ming Lei
2021-10-25 9:44 ` Ming Lei [this message]
2021-10-26 7:21 ` [PATCH 1/8] loop: move flush_dcache_page to ->complete of request Christoph Hellwig
2021-10-25 9:44 ` [PATCH 2/8] loop: remove always true check Ming Lei
2021-10-26 7:31 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 3/8] loop: add one helper for submitting IO on backing file Ming Lei
2021-10-25 9:44 ` [PATCH 4/8] loop: cover simple read/write via lo_rw_aio() Ming Lei
2021-10-26 7:35 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 5/8] loop: fallback to buffered IO in case of dio submission Ming Lei
2021-10-26 7:36 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 6/8] loop: relax loop dio use condition Ming Lei
2021-10-26 7:37 ` Christoph Hellwig
2021-10-27 0:20 ` kernel test robot
2021-10-25 9:44 ` [PATCH 7/8] loop: remove lo->use_dio Ming Lei
2021-10-25 9:44 ` [RFC PATCH 8/8] loop: use backing dio at default Ming Lei
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