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168 lines
6.0 KiB
168 lines
6.0 KiB
From a2069ff76637365cacf5b96f9427b98a6ca2c9ba Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Thu, 14 Sep 2023 10:01:00 -0400
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Subject: [PATCH 075/101] virtio-blk: don't lock AioContext in the completion
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code path
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 214: Remove AioContext lock
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RH-Jira: RHEL-15965
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Commit: [6/26] 3426f62c2156f6967bb4ffbce75a4ff46d3312a3 (kmwolf/centos-qemu-kvm)
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Nothing in the completion code path relies on the AioContext lock
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anymore. Virtqueues are only accessed from one thread at any moment and
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the s->rq global state is protected by its own lock now.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-ID: <20230914140101.1065008-4-stefanha@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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hw/block/virtio-blk.c | 34 ++++------------------------------
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1 file changed, 4 insertions(+), 30 deletions(-)
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diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
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index ee38e089bc..f5315df042 100644
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--- a/hw/block/virtio-blk.c
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+++ b/hw/block/virtio-blk.c
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@@ -105,7 +105,6 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
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VirtIOBlock *s = next->dev;
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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while (next) {
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VirtIOBlockReq *req = next;
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next = req->mr_next;
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@@ -138,7 +137,6 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
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block_acct_done(blk_get_stats(s->blk), &req->acct);
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virtio_blk_free_request(req);
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}
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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}
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static void virtio_blk_flush_complete(void *opaque, int ret)
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@@ -146,19 +144,13 @@ static void virtio_blk_flush_complete(void *opaque, int ret)
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VirtIOBlockReq *req = opaque;
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VirtIOBlock *s = req->dev;
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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- if (ret) {
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- if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
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- goto out;
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- }
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+ if (ret && virtio_blk_handle_rw_error(req, -ret, 0, true)) {
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+ return;
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}
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virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
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block_acct_done(blk_get_stats(s->blk), &req->acct);
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virtio_blk_free_request(req);
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-
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-out:
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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}
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static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
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@@ -168,11 +160,8 @@ static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
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bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
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~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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- if (ret) {
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- if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
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- goto out;
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- }
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+ if (ret && virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
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+ return;
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}
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virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
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@@ -180,9 +169,6 @@ static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
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block_acct_done(blk_get_stats(s->blk), &req->acct);
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}
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virtio_blk_free_request(req);
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-
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-out:
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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}
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#ifdef __linux__
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@@ -229,10 +215,8 @@ static void virtio_blk_ioctl_complete(void *opaque, int status)
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virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
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out:
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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virtio_blk_req_complete(req, status);
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virtio_blk_free_request(req);
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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g_free(ioctl_req);
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}
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@@ -672,7 +656,6 @@ static void virtio_blk_zone_report_complete(void *opaque, int ret)
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{
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ZoneCmdData *data = opaque;
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VirtIOBlockReq *req = data->req;
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- VirtIOBlock *s = req->dev;
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VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
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struct iovec *in_iov = data->in_iov;
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unsigned in_num = data->in_num;
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@@ -763,10 +746,8 @@ static void virtio_blk_zone_report_complete(void *opaque, int ret)
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}
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out:
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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virtio_blk_req_complete(req, err_status);
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virtio_blk_free_request(req);
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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g_free(data->zone_report_data.zones);
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g_free(data);
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}
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@@ -829,10 +810,8 @@ static void virtio_blk_zone_mgmt_complete(void *opaque, int ret)
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err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
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}
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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virtio_blk_req_complete(req, err_status);
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virtio_blk_free_request(req);
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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}
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static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op)
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@@ -882,7 +861,6 @@ static void virtio_blk_zone_append_complete(void *opaque, int ret)
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{
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ZoneCmdData *data = opaque;
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VirtIOBlockReq *req = data->req;
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- VirtIOBlock *s = req->dev;
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VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
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int64_t append_sector, n;
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uint8_t err_status = VIRTIO_BLK_S_OK;
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@@ -905,10 +883,8 @@ static void virtio_blk_zone_append_complete(void *opaque, int ret)
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trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret);
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out:
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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virtio_blk_req_complete(req, err_status);
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virtio_blk_free_request(req);
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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g_free(data);
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}
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@@ -944,10 +920,8 @@ static int virtio_blk_handle_zone_append(VirtIOBlockReq *req,
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return 0;
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out:
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- aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
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virtio_blk_req_complete(req, err_status);
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virtio_blk_free_request(req);
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- aio_context_release(blk_get_aio_context(s->conf.conf.blk));
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return err_status;
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}
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--
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2.39.3
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