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qemu-nbd: adds option for aio engines

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Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
Acked-by: Eric Blake <eblake@redhat.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20200120141858.587874-14-stefanha@redhat.com
Message-Id: <20200120141858.587874-14-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Aarushi Mehta 2020-01-20 14:18:56 +00:00 • committed by Stefan Hajnoczi
parent cdd267749a
commit 7680274da1
2 changed files with 6 additions and 10 deletions
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4
docs/interop/qemu-nbd.rst
View file

@ -108,8 +108,8 @@ driver options if ``--image-opts`` is specified.
.. option:: --aio=AIO .. option:: --aio=AIO
Set the asynchronous I/O mode between ``threads`` (the default) Set the asynchronous I/O mode between ``threads`` (the default),
and ``native`` (Linux only). ``native`` (Linux only), and ``io_uring`` (Linux 5.1+).
.. option:: --discard=DISCARD .. option:: --discard=DISCARD

12
qemu-nbd.c
View file

@ -135,7 +135,7 @@ static void usage(const char *name)
" '[ID_OR_NAME]'\n" " '[ID_OR_NAME]'\n"
" -n, --nocache disable host cache\n" " -n, --nocache disable host cache\n"
" --cache=MODE set cache mode (none, writeback, ...)\n" " --cache=MODE set cache mode (none, writeback, ...)\n"
" --aio=MODE set AIO mode (native or threads)\n" " --aio=MODE set AIO mode (native, io_uring or threads)\n"
" --discard=MODE set discard mode (ignore, unmap)\n" " --discard=MODE set discard mode (ignore, unmap)\n"
" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
" --image-opts treat FILE as a full set of image options\n" " --image-opts treat FILE as a full set of image options\n"
@ -726,13 +726,9 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
seen_aio = true; seen_aio = true;
if (!strcmp(optarg, "native")) { if (bdrv_parse_aio(optarg, &flags) < 0) {
flags |= BDRV_O_NATIVE_AIO; error_report("Invalid aio mode '%s'", optarg);
} else if (!strcmp(optarg, "threads")) { exit(EXIT_FAILURE);
/* this is the default */
} else {
error_report("invalid aio mode `%s'", optarg);
exit(EXIT_FAILURE);
} }
break; break;
case QEMU_NBD_OPT_DISCARD: case QEMU_NBD_OPT_DISCARD: