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qemu-io: Fix 'map' output 

The output of the 'map' command in qemu-io used to directly resemble
bdrv_is_allocated() and could contain many lines for small chunks that
all have the same allocation status. After this patch, they will be
coalesced into a single output line for a large chunk.

As a side effect, the command gains some error handling.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2013-05-13 15:31:34 +02:00 committed by Stefan Hajnoczi
parent c8a83e8500
commit a00e81e98f
1 changed files with 41 additions and 5 deletions
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46
qemu-io.c
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@ -1635,12 +1635,43 @@ static const cmdinfo_t alloc_cmd = {
.oneline = "checks if a sector is present in the file",
};
static int map_is_allocated(int64_t sector_num, int64_t nb_sectors, int64_t *pnum)
{
int num, num_checked;
int ret, firstret;
num_checked = MIN(nb_sectors, INT_MAX);
ret = bdrv_is_allocated(bs, sector_num, num_checked, &num);
if (ret < 0) {
return ret;
}
firstret = ret;
*pnum = num;
while (nb_sectors > 0 && ret == firstret) {
sector_num += num;
nb_sectors -= num;
num_checked = MIN(nb_sectors, INT_MAX);
ret = bdrv_is_allocated(bs, sector_num, num_checked, &num);
if (ret == firstret) {
*pnum += num;
} else {
break;
}
}
return firstret;
}
static int map_f(int argc, char **argv)
{
int64_t offset;
int64_t nb_sectors;
char s1[64];
int num, num_checked;
int64_t num;
int ret;
const char *retstr;
@ -1648,12 +1679,17 @@ static int map_f(int argc, char **argv)
nb_sectors = bs->total_sectors;
do {
num_checked = MIN(nb_sectors, INT_MAX);
ret = bdrv_is_allocated(bs, offset, num_checked, &num);
ret = map_is_allocated(offset, nb_sectors, &num);
if (ret < 0) {
error_report("Failed to get allocation status: %s", strerror(-ret));
return 0;
}
retstr = ret ? " allocated" : "not allocated";
cvtstr(offset << 9ULL, s1, sizeof(s1));
printf("[% 24" PRId64 "] % 8d/% 8d sectors %s at offset %s (%d)\n",
offset << 9ULL, num, num_checked, retstr, s1, ret);
printf("[% 24" PRId64 "] % 8" PRId64 "/% 8" PRId64 " sectors %s "
"at offset %s (%d)\n",
offset << 9ULL, num, nb_sectors, retstr, s1, ret);
offset += num;
nb_sectors -= num;