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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/vfs.h>
#include <smbsrv/smb_ktypes.h>
#include <smbsrv/smb_kproto.h>
static smb_vfs_t *smb_vfs_find(smb_export_t *, vfs_t *);
static void smb_vfs_destroy(smb_vfs_t *);
/*
* If a hold on the specified VFS has already been taken
* then only increment the reference count of the corresponding
* smb_vfs_t structure. If no smb_vfs_t structure has been created
* yet for the specified VFS then create one and take a hold on
* the VFS.
*/
int
smb_vfs_hold(smb_export_t *se, vfs_t *vfsp)
{
smb_vfs_t *smb_vfs;
vnode_t *rootvp;
int rc;
if (se == NULL || vfsp == NULL)
return (EINVAL);
smb_llist_enter(&se->e_vfs_list, RW_WRITER);
if ((smb_vfs = smb_vfs_find(se, vfsp)) != NULL) {
smb_vfs->sv_refcnt++;
DTRACE_PROBE1(smb_vfs_hold_hit, smb_vfs_t *, smb_vfs);
smb_llist_exit(&se->e_vfs_list);
return (0);
}
if ((rc = VFS_ROOT(vfsp, &rootvp)) != 0) {
smb_llist_exit(&se->e_vfs_list);
return (rc);
}
smb_vfs = kmem_cache_alloc(smb_kshare_cache_vfs, KM_SLEEP);
bzero(smb_vfs, sizeof (smb_vfs_t));
smb_vfs->sv_magic = SMB_VFS_MAGIC;
smb_vfs->sv_refcnt = 1;
smb_vfs->sv_vfsp = vfsp;
/*
* We have a hold on the root vnode of the file system
* from the VFS_ROOT call above.
*/
smb_vfs->sv_rootvp = rootvp;
smb_llist_insert_head(&se->e_vfs_list, smb_vfs);
DTRACE_PROBE1(smb_vfs_hold_miss, smb_vfs_t *, smb_vfs);
smb_llist_exit(&se->e_vfs_list);
return (0);
}
/*
* smb_vfs_rele
*
* Decrements the reference count of the fs passed in. If the reference count
* drops to zero the smb_vfs_t structure associated with the fs is freed.
*/
void
smb_vfs_rele(smb_export_t *se, vfs_t *vfsp)
{
smb_vfs_t *smb_vfs;
ASSERT(vfsp);
smb_llist_enter(&se->e_vfs_list, RW_WRITER);
smb_vfs = smb_vfs_find(se, vfsp);
DTRACE_PROBE1(smb_vfs_release, smb_vfs_t *, smb_vfs);
if (smb_vfs) {
ASSERT(smb_vfs->sv_refcnt);
if (--smb_vfs->sv_refcnt == 0) {
smb_llist_remove(&se->e_vfs_list, smb_vfs);
smb_llist_exit(&se->e_vfs_list);
smb_vfs_destroy(smb_vfs);
return;
}
}
smb_llist_exit(&se->e_vfs_list);
}
/*
* smb_vfs_rele_all()
*
* Release all holds on root vnodes of file systems which were taken
* due to the existence of at least one enabled share on the file system.
* Called at driver close time.
*/
void
smb_vfs_rele_all(smb_export_t *se)
{
smb_vfs_t *smb_vfs;
smb_llist_enter(&se->e_vfs_list, RW_WRITER);
while ((smb_vfs = smb_llist_head(&se->e_vfs_list)) != NULL) {
ASSERT(smb_vfs->sv_magic == SMB_VFS_MAGIC);
DTRACE_PROBE1(smb_vfs_rele_all_hit, smb_vfs_t *, smb_vfs);
smb_llist_remove(&se->e_vfs_list, smb_vfs);
smb_vfs_destroy(smb_vfs);
}
smb_llist_exit(&se->e_vfs_list);
}
/*
* Goes through the list of smb_vfs_t structure and returns the one matching
* the vnode passed in. If no match is found a NULL pointer is returned.
*
* The list of smb_vfs_t structures has to have been entered prior calling
* this function.
*/
static smb_vfs_t *
smb_vfs_find(smb_export_t *se, vfs_t *vfsp)
{
smb_vfs_t *smb_vfs;
smb_vfs = smb_llist_head(&se->e_vfs_list);
while (smb_vfs) {
ASSERT(smb_vfs->sv_magic == SMB_VFS_MAGIC);
if (smb_vfs->sv_vfsp == vfsp)
return (smb_vfs);
smb_vfs = smb_llist_next(&se->e_vfs_list, smb_vfs);
}
return (NULL);
}
static void
smb_vfs_destroy(smb_vfs_t *smb_vfs)
{
VN_RELE(smb_vfs->sv_rootvp);
smb_vfs->sv_magic = (uint32_t)~SMB_VFS_MAGIC;
kmem_cache_free(smb_kshare_cache_vfs, smb_vfs);
}
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