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bhyveload: correctly query size of disks

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On FreeBSD fstat(2) works fine for querying sizes of plain files,
but not so much for character devices.
So, use DIOCGMEDIASIZE to try to get the correct size for disks
and disk-like devices (e.g. zvols).

PR:		220186
Reviewed by:	tsoome, grehan
MFC after:	1 week
This commit is contained in:
Andriy Gapon 2017-06-21 18:19:27 +00:00
parent 47d8a7d4d1
commit 6589ee29df
1 changed files with 5 additions and 3 deletions
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8
usr.sbin/bhyveload/bhyveload.c
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@ -311,10 +311,12 @@ cb_diskioctl(void *arg, int unit, u_long cmd, void *data)
*(u_int *)data = 512;
break;
case DIOCGMEDIASIZE:
if (fstat(disk_fd[unit], &sb) == 0)
*(off_t *)data = sb.st_size;
else
if (fstat(disk_fd[unit], &sb) != 0)
return (ENOTTY);
if (S_ISCHR(sb.st_mode) &&
ioctl(disk_fd[unit], DIOCGMEDIASIZE, &sb.st_size) != 0)
return (ENOTTY);
*(off_t *)data = sb.st_size;
break;
default:
return (ENOTTY);