void
vfs_clearmntopt(vfs_t *vfsp, const char *name)
{
int locked;
if (!(locked = mtx_owned(MNT_MTX(vfsp))))
MNT_ILOCK(vfsp);
vfs_deleteopt(vfsp->mnt_opt, name);
if (!locked)
MNT_IUNLOCK(vfsp);
}
/*
* High level function to manipulate export options on a mount point
* and the passed in netexport.
* Struct export_args *argp is the variable used to twiddle options,
* the structure is described in sys/mount.h
*/
int
vfs_export(struct mount *mp, struct export_args *argp)
{
struct netexport *nep;
int error;
if (argp->ex_numsecflavors < 0
|| argp->ex_numsecflavors >= MAXSECFLAVORS)
return (EINVAL);
error = 0;
lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
nep = mp->mnt_export;
if (argp->ex_flags & MNT_DELEXPORT) {
if (nep == NULL) {
error = ENOENT;
goto out;
}
if (mp->mnt_flag & MNT_EXPUBLIC) {
vfs_setpublicfs(NULL, NULL, NULL);
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_EXPUBLIC;
MNT_IUNLOCK(mp);
}
vfs_free_addrlist(nep);
mp->mnt_export = NULL;
free(nep, M_MOUNT);
nep = NULL;
MNT_ILOCK(mp);
mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
MNT_IUNLOCK(mp);
}
if (argp->ex_flags & MNT_EXPORTED) {
if (nep == NULL) {
nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
mp->mnt_export = nep;
}
if (argp->ex_flags & MNT_EXPUBLIC) {
if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
goto out;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_EXPUBLIC;
MNT_IUNLOCK(mp);
}
if ((error = vfs_hang_addrlist(mp, nep, argp)))
goto out;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_EXPORTED;
MNT_IUNLOCK(mp);
}
out:
lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
/*
* Once we have executed the vfs_export() command, we do
* not want to keep the "export" option around in the
* options list, since that will cause subsequent MNT_UPDATE
* calls to fail. The export information is saved in
* mp->mnt_export, so we can safely delete the "export" mount option
* here.
*/
vfs_deleteopt(mp->mnt_optnew, "export");
vfs_deleteopt(mp->mnt_opt, "export");
return (error);
}
