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Readd zpool_clear_label() from OpenSolaris 

This patch restores the zpool_clear_label() function from
OpenSolaris.  This was removed by commit d603ed6 because
it wasn't clear we had a use for it in ZoL.  However, this
functionality is a prerequisite for adding the 'zpool labelclear'
command from FreeBSD.

As part of bringing this change in the zpool_clear_label()
function was changed to use fstat64_blk(2) for compatibility
with Linux.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1126
This commit is contained in:
Dmitry Khasanov 2013-07-05 17:44:53 +07:00 committed by Brian Behlendorf
parent 5021058756
commit 51a3ae72d2
1 changed files with 30 additions and 0 deletions
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30
lib/libzfs/libzfs_import.c
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@ -900,6 +900,36 @@ zpool_read_label(int fd, nvlist_t **config)
return (0);
}
/*
* Given a file descriptor, clear (zero) the label information. This function
* is currently only used in the appliance stack as part of the ZFS sysevent
* module.
*/
int
zpool_clear_label(int fd)
{
struct stat64 statbuf;
int l;
vdev_label_t *label;
uint64_t size;
if (fstat64_blk(fd, &statbuf) == -1)
return (0);
size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL)
return (-1);
for (l = 0; l < VDEV_LABELS; l++) {
if (pwrite64(fd, label, sizeof (vdev_label_t),
label_offset(size, l)) != sizeof (vdev_label_t))
return (-1);
}
free(label);
return (0);
}
#ifdef HAVE_LIBBLKID
/*
* Use libblkid to quickly search for zfs devices