[Qemu-devel] [PATCH v3 3/3] qemu-nbd: always compile in --aio=MODE option

[Stefan Hajnoczi <stefanha@redhat.com>]

The --aio=MODE option enables Linux AIO or Windows overlapped I/O.

The #ifdef CONFIG_LINUX_AIO was a layering violation that also prevented
Windows overlapped I/O from being used.

Now that raw-posix.c prints an error when Linux AIO has not been
compiled in, we can unconditionally compile the option into qemu-nbd.

After this patch qemu-nbd --aio=native works on Windows.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 qemu-nbd.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index 5106b80..a36f0f5 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -98,9 +98,7 @@ static void usage(const char *name)
 "                            '[ID_OR_NAME]'\n"
 "  -n, --nocache             disable host cache\n"
 "      --cache=MODE          set cache mode (none, writeback, ...)\n"
-#ifdef CONFIG_LINUX_AIO
 "      --aio=MODE            set AIO mode (native or threads)\n"
-#endif
 "      --discard=MODE        set discard mode (ignore, unmap)\n"
 "      --detect-zeroes=MODE  set detect-zeroes mode (off, on, discard)\n"
 "\n"
@@ -429,9 +427,7 @@ int main(int argc, char **argv)
         { "load-snapshot", 1, NULL, 'l' },
         { "nocache", 0, NULL, 'n' },
         { "cache", 1, NULL, QEMU_NBD_OPT_CACHE },
-#ifdef CONFIG_LINUX_AIO
         { "aio", 1, NULL, QEMU_NBD_OPT_AIO },
-#endif
         { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD },
         { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES },
         { "shared", 1, NULL, 'e' },
@@ -450,9 +446,7 @@ int main(int argc, char **argv)
     int fd;
     bool seen_cache = false;
     bool seen_discard = false;
-#ifdef CONFIG_LINUX_AIO
     bool seen_aio = false;
-#endif
     pthread_t client_thread;
     const char *fmt = NULL;
     Error *local_err = NULL;
@@ -485,7 +479,6 @@ int main(int argc, char **argv)
                 errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg);
             }
             break;
-#ifdef CONFIG_LINUX_AIO
         case QEMU_NBD_OPT_AIO:
             if (seen_aio) {
                 errx(EXIT_FAILURE, "--aio can only be specified once");
@@ -499,7 +492,6 @@ int main(int argc, char **argv)
                errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg);
             }
             break;
-#endif
         case QEMU_NBD_OPT_DISCARD:
             if (seen_discard) {
                 errx(EXIT_FAILURE, "--discard can only be specified once");
-- 
2.4.3