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qemu-io: Respect early image end for map 

bdrv_is_allocated() may report zero clusters which most probably means
the image (file) is shorter than expected. Respect this case in order to
avoid an infinite loop.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2014-10-22 17:00:16 +02:00 committed by Kevin Wolf
parent 59c9a95fd2
commit 4b25bbc4c2
1 changed files with 4 additions and 1 deletions
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5
qemu-io-cmds.c
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@ -1900,7 +1900,7 @@ static int map_is_allocated(BlockDriverState *bs, int64_t sector_num,
num_checked = MIN(nb_sectors, INT_MAX);
ret = bdrv_is_allocated(bs, sector_num, num_checked, &num);
if (ret == firstret) {
if (ret == firstret && num) {
*pnum += num;
} else {
break;
@ -1927,6 +1927,9 @@ static int map_f(BlockDriverState *bs, int argc, char **argv)
if (ret < 0) {
error_report("Failed to get allocation status: %s", strerror(-ret));
return 0;
} else if (!num) {
error_report("Unexpected end of image");
return 0;
}
retstr = ret ? " allocated" : "not allocated";