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authorKevin Wolf <kwolf@redhat.com>2013-05-13 15:31:34 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2013-05-24 16:17:55 +0200
commita00e81e98f71c91a35b96bcd8ae431a86f42378d (patch)
tree633b8316d6c9cdd08f7df561547e5a140fc09ca2 /qemu-io.c
parentc8a83e8500329d82f1282c4905be11a39078007f (diff)
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>
Diffstat (limited to 'qemu-io.c')
-rw-r--r--qemu-io.c46
1 files changed, 41 insertions, 5 deletions
diff --git a/qemu-io.c b/qemu-io.c
index 475a8bd034..5e6680b247 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -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;