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authorEric Blake <eblake@redhat.com>2020-04-28 15:28:59 -0500
committerKevin Wolf <kwolf@redhat.com>2020-05-08 13:26:35 +0200
commit8f23aaf5d6a5458e251c5d5d0555d9e515355e35 (patch)
tree222449c884848e6ede2fb43e7d0343372aa91192 /block
parent8e519795041e3293ab6b4e67f5416fa80dc0efc4 (diff)
nfs: Support BDRV_REQ_ZERO_WRITE for truncate
Our .bdrv_has_zero_init_truncate returns 1 if we detect that the OS always 0-fills; we can use that same knowledge to implement BDRV_REQ_ZERO_WRITE by ignoring it when the OS gives it to us for free. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200428202905.770727-4-eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/nfs.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/nfs.c b/block/nfs.c
index 385d756e1d..76daa7c9f6 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -620,6 +620,9 @@ static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
}
bs->total_sectors = ret;
+ if (client->has_zero_init) {
+ bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
+ }
return 0;
}