Commit c6e3f520 authored by Kevin Wolf's avatar Kevin Wolf
Browse files

qemu-io: Add write -n for BDRV_REQ_NO_FALLBACK 



This makes the new BDRV_REQ_NO_FALLBACK flag available in the qemu-io
write command.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Acked-by: default avatarEric Blake <eblake@redhat.com>
parent c9fdcf20

qemu-io-cmds.c

+11 −2
Original line number Diff line number Diff line
@@ -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;