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sheepdog: switch to writethrough mode if cluster doesn't support flush 

This is necessary for qemu to work with the older version of Sheepdog
which doesn't support SD_OP_FLUSH_VDI.

Signed-off-by: MORITA Kazutaka <morita.kazutaka@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
MORITA Kazutaka 2012-05-03 05:26:07 +09:00 committed by Kevin Wolf
parent 847c25d01c
commit 115c2b5a68
1 changed files with 8 additions and 0 deletions
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8
block/sheepdog.c
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@ -1678,6 +1678,14 @@ static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs)
return ret;
}
if (rsp->result == SD_RES_INVALID_PARMS) {
dprintf("disable write cache since the server doesn't support it\n");
s->cache_enabled = 0;
closesocket(s->flush_fd);
return 0;
}
if (rsp->result != SD_RES_SUCCESS) {
error_report("%s", sd_strerror(rsp->result));
return -EIO;