diff options
| -rw-r--r-- | qemu-io-cmds.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c index 35dcdcf413..09750a23ce 100644 --- a/qemu-io-cmds.c +++ b/qemu-io-cmds.c @@ -946,6 +946,7 @@ static void write_help(void) " -b, -- write to the VM state rather than the virtual disk\n" " -c, -- write compressed data with blk_write_compressed\n" " -f, -- use Force Unit Access semantics\n" +" -n, -- with -z, don't allow slow fallback\n" " -p, -- ignored for backwards compatibility\n" " -P, -- use different pattern to fill file\n" " -C, -- report statistics in a machine parsable format\n" @@ -964,7 +965,7 @@ static const cmdinfo_t write_cmd = { .perm = BLK_PERM_WRITE, .argmin = 2, .argmax = -1, - .args = "[-bcCfquz] [-P pattern] off len", + .args = "[-bcCfnquz] [-P pattern] off len", .oneline = "writes a number of bytes at a specified offset", .help = write_help, }; @@ -983,7 +984,7 @@ static int write_f(BlockBackend *blk, int argc, char **argv) int64_t total = 0; int pattern = 0xcd; - while ((c = getopt(argc, argv, "bcCfpP:quz")) != -1) { + while ((c = getopt(argc, argv, "bcCfnpP:quz")) != -1) { switch (c) { case 'b': bflag = true; @@ -997,6 +998,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv) case 'f': flags |= BDRV_REQ_FUA; break; + case 'n': + flags |= BDRV_REQ_NO_FALLBACK; + break; case 'p': /* Ignored for backwards compatibility */ break; @@ -1037,6 +1041,11 @@ static int write_f(BlockBackend *blk, int argc, char **argv) return -EINVAL; } + if ((flags & BDRV_REQ_NO_FALLBACK) && !zflag) { + printf("-n requires -z to be specified\n"); + return -EINVAL; + } + if ((flags & BDRV_REQ_MAY_UNMAP) && !zflag) { printf("-u requires -z to be specified\n"); return -EINVAL; |