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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) 2012, Joyent, Inc. All rights reserved.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/t_lock.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/debug.h>
#include <sys/time.h>
#include <sys/cmn_err.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <sys/mode.h>
#include <sys/vfs.h>
#include <sys/cred.h>
#include <sys/kmem.h>
#include <sys/atomic.h>
#include <sys/policy.h>
#include <sys/fs/hyprlofs_info.h>
#define MODESHIFT 3
/* Initialize a hlnode and add it to file list under mount point. */
void
hyprlofs_node_init(hlfsmount_t *hm, hlnode_t *h, vattr_t *vap, cred_t *cr)
{
vnode_t *vp;
timestruc_t now;
ASSERT(vap != NULL);
rw_init(&h->hln_rwlock, NULL, RW_DEFAULT, NULL);
mutex_init(&h->hln_tlock, NULL, MUTEX_DEFAULT, NULL);
h->hln_mode = MAKEIMODE(vap->va_type, vap->va_mode);
h->hln_mask = 0;
h->hln_type = vap->va_type;
h->hln_nodeid = (ino64_t)(uint32_t)((uintptr_t)h >> 3);
h->hln_nlink = 1;
h->hln_size = 0;
if (cr == NULL) {
h->hln_uid = vap->va_uid;
h->hln_gid = vap->va_gid;
} else {
h->hln_uid = crgetuid(cr);
h->hln_gid = crgetgid(cr);
}
h->hln_fsid = hm->hlm_dev;
h->hln_rdev = vap->va_rdev;
h->hln_blksize = PAGESIZE;
h->hln_nblocks = 0;
gethrestime(&now);
h->hln_atime = now;
h->hln_mtime = now;
h->hln_ctime = now;
h->hln_seq = 0;
h->hln_dir = NULL;
h->hln_vnode = vn_alloc(KM_SLEEP);
vp = HLNTOV(h);
vn_setops(vp, hyprlofs_vnodeops);
vp->v_vfsp = hm->hlm_vfsp;
vp->v_type = vap->va_type;
vp->v_rdev = vap->va_rdev;
vp->v_data = (caddr_t)h;
mutex_enter(&hm->hlm_contents);
/*
* Increment the pseudo generation number for this hlnode. Since
* hlnodes are allocated and freed, there really is no particular
* generation number for a new hlnode. Just fake it by using a
* counter in each file system.
*/
h->hln_gen = hm->hlm_gen++;
/*
* Add new hlnode to end of linked list of hlnodes for this hyprlofs
* Root dir is handled specially in hyprlofs_mount.
*/
if (hm->hlm_rootnode != (hlnode_t *)NULL) {
h->hln_forw = NULL;
h->hln_back = hm->hlm_rootnode->hln_back;
h->hln_back->hln_forw = hm->hlm_rootnode->hln_back = h;
}
mutex_exit(&hm->hlm_contents);
vn_exists(vp);
}
int
hyprlofs_taccess(void *vtp, int mode, cred_t *cr)
{
hlnode_t *hp = vtp;
int shift = 0;
/* Check access based on owner, group and public perms in hlnode. */
if (crgetuid(cr) != hp->hln_uid) {
shift += MODESHIFT;
if (groupmember(hp->hln_gid, cr) == 0)
shift += MODESHIFT;
}
return (secpolicy_vnode_access2(cr, HLNTOV(hp), hp->hln_uid,
hp->hln_mode << shift, mode));
}
/*
* Allocate zeroed memory if hyprlofs_maxkmem has not been exceeded or the
* 'musthave' flag is set. 'musthave' allocations should always be subordinate
* to normal allocations so that hyprlofs_maxkmem can't be exceeded by more
* than a few KB. E.g. when creating a new dir, the hlnode is a normal
* allocation; if that succeeds, the dirents for "." and ".." are 'musthave'
* allocations.
*/
void *
hyprlofs_memalloc(size_t size, int musthave)
{
if (atomic_add_long_nv(&hyprlofs_kmemspace, size) < hyprlofs_maxkmem ||
musthave)
return (kmem_zalloc(size, KM_SLEEP));
atomic_add_long(&hyprlofs_kmemspace, -size);
cmn_err(CE_WARN, "hyprlofs over memory limit");
return (NULL);
}
void
hyprlofs_memfree(void *cp, size_t size)
{
kmem_free(cp, size);
atomic_add_long(&hyprlofs_kmemspace, -size);
}
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