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virt-format: Discard the data on the disks.

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If possible, this means that the host will be able to reclaim most of
the space used by formatted disks.
This commit is contained in:
Richard W.M. Jones
2014-03-11 14:20:53 +00:00
parent 93f1bfcad7
commit fb3afdff47
3 changed files with 19 additions and 0 deletions
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13
format/format.c
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@@ -188,6 +188,11 @@ main (int argc, char *argv[])
case 'a':
OPTION_a;
/* Enable discard on all drives added on the command line. */
assert (drvs != NULL);
assert (drvs->type == drv_a);
drvs->a.discard = "besteffort";
break;
case 'v':
@@ -342,6 +347,14 @@ do_format (void)
}
}
/* Send TRIM/UNMAP to all block devices, to give back the space to
* the host. However don't fail if this doesn't work.
*/
guestfs_push_error_handler (g, NULL, NULL);
for (i = 0; devices[i] != NULL; ++i)
guestfs_blkdiscard (g, devices[i]);
guestfs_pop_error_handler (g);
if (do_rescan (devices))
return 1; /* which means, reopen the handle and retry */