3977e7cae6
Follow up on ideas prompted by last change: clean up the patches generated by git workflow. There is no value to the first line (mbox From line), or [PATCH] on subject line. Get rid of those. Other minor fixes and improvements to update_git.sh OBS-URL: https://build.opensuse.org/request/show/662931 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=443
70 lines
2.0 KiB
Diff
70 lines
2.0 KiB
Diff
From: Bruce Rogers <brogers@suse.com>
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Date: Wed, 9 Mar 2016 15:18:11 -0700
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Subject: xen_disk: Add suse specific flush disable handling and map to QEMU
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equiv
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Add code to read the suse specific suse-diskcache-disable-flush flag out
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of xenstore, and set the equivalent flag within QEMU.
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Patch taken from Xen's patch queue, Olaf Hering being the original author.
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[bsc#879425]
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[BR: minor edits to pass qemu's checkpatch script]
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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Signed-off-by: Olaf Hering <olaf@aepfle.de>
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---
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hw/block/xen_disk.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
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index 36eff94f84..ddd5c7cbfd 100644
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--- a/hw/block/xen_disk.c
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+++ b/hw/block/xen_disk.c
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@@ -90,6 +90,8 @@ struct XenBlkDev {
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int requests_finished;
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unsigned int max_requests;
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+ gboolean cache_unsafe;
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+ /* Persistent grants extension */
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gboolean feature_discard;
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/* qemu block driver */
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@@ -642,6 +644,18 @@ static void blk_parse_discard(struct XenBlkDev *blkdev)
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}
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}
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+static void blk_parse_cache_unsafe(struct XenBlkDev *blkdev)
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+{
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+ int enable;
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+
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+ blkdev->cache_unsafe = false;
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+
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+ if (xenstore_read_be_int(&blkdev->xendev, "suse-diskcache-disable-flush",
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+ &enable) == 0) {
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+ blkdev->cache_unsafe = !!enable;
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+ }
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+}
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+
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static int blk_init(struct XenDevice *xendev)
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{
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struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
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@@ -717,6 +731,7 @@ static int blk_init(struct XenDevice *xendev)
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MAX_RING_PAGE_ORDER);
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blk_parse_discard(blkdev);
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+ blk_parse_cache_unsafe(blkdev);
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g_free(directiosafe);
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return 0;
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@@ -764,6 +779,10 @@ static int blk_connect(struct XenDevice *xendev)
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qflags |= BDRV_O_UNMAP;
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}
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+ if (blkdev->cache_unsafe) {
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+ qflags |= BDRV_O_NO_FLUSH;
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+ }
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+
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/* init qemu block driver */
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index = (xendev->dev - 202 * 256) / 16;
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blkdev->dinfo = drive_get(IF_XEN, 0, index);
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