diff options
| -rw-r--r-- | qemu-nbd.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c index 626e5844f9..6ef8b10bcc 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -18,11 +18,13 @@ #include "qemu-common.h" #include "block/block.h" +#include "block/block_int.h" #include "block/nbd.h" #include "qemu/main-loop.h" #include "qemu/sockets.h" #include "qemu/error-report.h" #include "block/snapshot.h" +#include "qapi/util.h" #include <stdarg.h> #include <stdio.h> @@ -41,6 +43,7 @@ #define QEMU_NBD_OPT_CACHE 1 #define QEMU_NBD_OPT_AIO 2 #define QEMU_NBD_OPT_DISCARD 3 +#define QEMU_NBD_OPT_DETECT_ZEROES 4 static NBDExport *exp; static int verbose; @@ -96,6 +99,8 @@ static void usage(const char *name) #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" "Report bugs to <qemu-devel@nongnu.org>\n" , name, NBD_DEFAULT_PORT, "DEVICE"); @@ -410,6 +415,7 @@ int main(int argc, char **argv) { "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' }, { "format", 1, NULL, 'f' }, { "persistent", 0, NULL, 't' }, @@ -432,6 +438,7 @@ int main(int argc, char **argv) pthread_t client_thread; const char *fmt = NULL; Error *local_err = NULL; + BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; /* The client thread uses SIGTERM to interrupt the server. A signal * handler ensures that "qemu-nbd -v -c" exits with a nice status code. @@ -483,6 +490,23 @@ int main(int argc, char **argv) errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg); } break; + case QEMU_NBD_OPT_DETECT_ZEROES: + detect_zeroes = + qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, + optarg, + BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, + BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, + &local_err); + if (local_err) { + errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s", + error_get_pretty(local_err)); + } + if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && + !(flags & BDRV_O_UNMAP)) { + errx(EXIT_FAILURE, "setting detect-zeroes to unmap is not allowed " + "without setting discard operation to unmap"); + } + break; case 'b': bindto = optarg; break; @@ -686,6 +710,7 @@ int main(int argc, char **argv) error_get_pretty(local_err)); } + bs->detect_zeroes = detect_zeroes; fd_size = bdrv_getlength(bs); if (partition != -1) { |