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[Qemu-devel] [PATCH 2/2] block/nfs: refuse readahead if cache.direct is
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCH 2/2] block/nfs: refuse readahead if cache.direct is on |
Date: |
Tue, 17 May 2016 16:11:55 +0200 |
Signed-off-by: Peter Lieven <address@hidden>
---
block/nfs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/nfs.c b/block/nfs.c
index 975510f..8b73a35 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -331,6 +331,11 @@ static int64_t nfs_client_open(NFSClient *client, const
char *filename,
nfs_set_tcp_syncnt(client->context, val);
#ifdef LIBNFS_FEATURE_READAHEAD
} else if (!strcmp(qp->p[i].name, "readahead")) {
+ if (open_flags & BDRV_O_NOCACHE) {
+ error_setg(errp, "Cannot enable NFS readahead "
+ "if cache.direct = on");
+ goto fail;
+ }
if (val > QEMU_NFS_MAX_READAHEAD_SIZE) {
error_report("NFS Warning: Truncating NFS readahead"
" size to %d", QEMU_NFS_MAX_READAHEAD_SIZE);
--
1.9.1