diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2015-07-23 13:48:34 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-10-16 15:34:30 +0200 |
| commit | 1501ecc1d89231164b4aecddd0219ed4395b693a (patch) | |
| tree | f21c8796f36edbea238a1884d461e20729875897 /block | |
| parent | 15489c769b9a4b3bec5b5848af2960689d7b4bd8 (diff) | |
raw-posix: warn about BDRV_O_NATIVE_AIO if libaio is unavailable
raw-posix.c silently ignores BDRV_O_NATIVE_AIO if libaio is unavailable.
It is confusing when aio=native performance is identical to aio=threads
because the binary was accidentally built without libaio.
Print a deprecation warning if -drive aio=native is used with a binary
that does not support libaio. There are probably users using aio=native
who would be inconvenienced if QEMU suddenly refused to start their
guests. In the future this will become an error.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/raw-posix.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c index cc1b8743ac..3a527f0b6b 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -519,7 +519,16 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, "future QEMU versions.\n", bs->filename); } -#endif +#else + if (bdrv_flags & BDRV_O_NATIVE_AIO) { + error_printf("WARNING: aio=native was specified for '%s', but " + "is not supported in this build. Falling back to " + "aio=threads.\n" + " This will become an error condition in " + "future QEMU versions.\n", + bs->filename); + } +#endif /* !defined(CONFIG_LINUX_AIO) */ s->has_discard = true; s->has_write_zeroes = true; |