75 lines
2.1 KiB
Diff
75 lines
2.1 KiB
Diff
From 2104686eb708bf87070c21e7af0e70e0317306b6 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Mon, 5 Jul 2021 21:36:41 +0100
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Subject: [PATCH] vddk: Implement can_flush and can_fua
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VDDK < 6.0 doesn't support flush. Previously we advertised flush and
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FUA but ignored them if VDDK didn't support it. Instead, correctly
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set these flags in the NBD protocol according to what VDDK supports.
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(cherry picked from commit 04b05274414a8cf4615eb2d6f46d5658814509c1)
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---
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plugins/vddk/vddk.c | 28 ++++++++++++++++++++--------
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1 file changed, 20 insertions(+), 8 deletions(-)
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diff --git a/plugins/vddk/vddk.c b/plugins/vddk/vddk.c
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index 76faa768..b5bce9a0 100644
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--- a/plugins/vddk/vddk.c
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+++ b/plugins/vddk/vddk.c
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@@ -772,12 +772,28 @@ vddk_pwrite (void *handle, const void *buf, uint32_t count, uint64_t offset,
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return -1;
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}
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- if (fua && vddk_flush (handle, 0) == -1)
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- return -1;
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+ if (fua) {
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+ if (vddk_flush (handle, 0) == -1)
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+ return -1;
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+ }
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return 0;
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}
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+static int
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+vddk_can_fua (void *handle)
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+{
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+ /* The Flush call was not available in VDDK < 6.0. */
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+ return VixDiskLib_Flush != NULL ? NBDKIT_FUA_NATIVE : NBDKIT_FUA_NONE;
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+}
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+
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+static int
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+vddk_can_flush (void *handle)
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+{
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+ /* The Flush call was not available in VDDK < 6.0. */
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+ return VixDiskLib_Flush != NULL;
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+}
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+
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/* Flush data to the file. */
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static int
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vddk_flush (void *handle, uint32_t flags)
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@@ -785,12 +801,6 @@ vddk_flush (void *handle, uint32_t flags)
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struct vddk_handle *h = handle;
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VixError err;
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- /* The Flush call was not available in VDDK < 6.0 so this is simply
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- * ignored on earlier versions.
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- */
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- if (VixDiskLib_Flush == NULL)
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- return 0;
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-
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DEBUG_CALL ("VixDiskLib_Flush", "handle");
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err = VixDiskLib_Flush (h->handle);
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if (err != VIX_OK) {
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@@ -985,6 +995,8 @@ static struct nbdkit_plugin plugin = {
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.get_size = vddk_get_size,
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.pread = vddk_pread,
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.pwrite = vddk_pwrite,
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+ .can_fua = vddk_can_fua,
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+ .can_flush = vddk_can_flush,
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.flush = vddk_flush,
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.can_extents = vddk_can_extents,
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.extents = vddk_extents,
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--
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2.31.1
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