NetBSD/sys/fs/smbfs/smbfs_node.c

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/* $NetBSD: smbfs_node.c,v 1.15 2003/04/02 16:26:53 jdolecek Exp $ */
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/*
* Copyright (c) 2000-2001 Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
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* FreeBSD: src/sys/fs/smbfs/smbfs_node.c,v 1.5 2001/12/20 22:42:26 dillon Exp
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*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: smbfs_node.c,v 1.15 2003/04/02 16:26:53 jdolecek Exp $");
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
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#include <uvm/uvm.h>
#include <uvm/uvm_extern.h>
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#include <fs/smbfs/smbfs.h>
#include <fs/smbfs/smbfs_node.h>
#include <fs/smbfs/smbfs_subr.h>
#define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
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#define smbfs_hash_lock(smp) lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE, NULL)
#define smbfs_hash_unlock(smp) lockmgr(&smp->sm_hashlock, LK_RELEASE, NULL)
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MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
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extern int (**smbfs_vnodeop_p) __P((void *));
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static struct genfs_ops smbfs_genfsops = {
NULL,
NULL,
genfs_compat_gop_write,
};
struct pool smbfs_node_pool;
static inline char *
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smbfs_name_alloc(const u_char *name, int nmlen)
{
u_char *cp;
cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK);
memcpy(cp, name, nmlen);
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return cp;
}
static inline void
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smbfs_name_free(u_char *name)
{
free(name, M_SMBNODENAME);
}
static int
smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp)
{
struct smbmount *smp = VFSTOSMBFS(mp);
struct smbnode_hashhead *nhpp;
struct smbnode *np, *np2, *dnp;
struct vnode *vp;
u_long hashval;
int error;
/* do not allow allocating root vnode twice */
KASSERT(dvp != NULL || smp->sm_root == NULL);
/* do not call with dot */
KASSERT(nmlen != 1 || name[0] != '.');
if (nmlen == 2 && memcmp(name, "..", 2) == 0) {
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if (dvp == NULL)
return EINVAL;
vp = VTOSMB(dvp)->n_parent->n_vnode;
if ((error = vget(vp, LK_EXCLUSIVE | LK_RETRY)) == 0)
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*vpp = vp;
return (error);
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}
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dnp = dvp ? VTOSMB(dvp) : NULL;
#ifdef DIAGNOSTIC
if (dnp == NULL && dvp != NULL)
panic("smbfs_node_alloc: dead parent vnode %p", dvp);
#endif
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hashval = smbfs_hash(name, nmlen);
retry:
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smbfs_hash_lock(smp);
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loop:
nhpp = SMBFS_NOHASH(smp, hashval);
LIST_FOREACH(np, nhpp, n_hash) {
if (np->n_parent != dnp
|| np->n_nmlen != nmlen
|| memcmp(name, np->n_name, nmlen) != 0)
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continue;
vp = SMBTOV(np);
simple_lock(&(vp)->v_interlock);
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smbfs_hash_unlock(smp);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK) != 0)
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goto retry;
*vpp = vp;
return (0);
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}
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smbfs_hash_unlock(smp);
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/*
* If we don't have node attributes, then it is an explicit lookup
* for an existing vnode.
*/
if (fap == NULL)
return ENOENT;
np = pool_get(&smbfs_node_pool, PR_WAITOK);
memset(np, 0, sizeof(*np));
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error = getnewvnode(VT_SMBFS, mp, smbfs_vnodeop_p, &vp);
if (error) {
pool_put(&smbfs_node_pool, np);
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return error;
}
vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
vp->v_data = np;
np->n_vnode = vp;
np->n_mount = VFSTOSMBFS(mp);
np->n_nmlen = nmlen;
np->n_name = smbfs_name_alloc(name, nmlen);
np->n_ino = fap->fa_ino;
np->n_size = fap->fa_size;
/* new file vnode has to have a parent */
KASSERT(vp->v_type != VREG || dvp != NULL);
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if (dvp) {
np->n_parent = dnp;
if (/*vp->v_type == VDIR &&*/ (dvp->v_flag & VROOT) == 0) {
vref(dvp);
np->n_flag |= NREFPARENT;
}
}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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smbfs_hash_lock(smp);
/*
* Check if the vnode wasn't added while we were in getnewvnode/
* malloc.
*/
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LIST_FOREACH(np2, nhpp, n_hash) {
if (np2->n_parent != dnp
|| np2->n_nmlen != nmlen
|| memcmp(name, np2->n_name, nmlen) != 0)
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continue;
vput(vp); /* XXX ungetnewvnode/free! */
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goto loop;
}
/* Not on hash list, add it now */
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LIST_INSERT_HEAD(nhpp, np, n_hash);
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smbfs_hash_unlock(smp);
genfs_node_init(vp, &smbfs_genfsops);
uvm_vnp_setsize(vp, np->n_size);
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*vpp = vp;
return 0;
}
int
smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
struct smbfattr *fap, struct vnode **vpp)
{
struct vnode *vp;
int error;
error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
if (error)
return error;
if (fap)
smbfs_attr_cacheenter(vp, fap);
*vpp = vp;
return 0;
}
/*
* Free smbnode, and give vnode back to system
*/
int
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smbfs_reclaim(v)
void *v;
{
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struct vop_reclaim_args /* {
struct vnode *a_vp;
struct thread *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
struct vnode *dvp;
struct smbnode *np = VTOSMB(vp);
struct smbmount *smp = VTOSMBFS(vp);
SMBVDEBUG("%.*s,%d\n", (int) np->n_nmlen, np->n_name, vp->v_usecount);
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smbfs_hash_lock(smp);
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dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
np->n_parent->n_vnode : NULL;
LIST_REMOVE(np, n_hash);
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cache_purge(vp);
if (smp->sm_root == np) {
SMBVDEBUG("root vnode\n");
smp->sm_root = NULL;
}
vp->v_data = NULL;
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smbfs_hash_unlock(smp);
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if (np->n_name)
smbfs_name_free(np->n_name);
pool_put(&smbfs_node_pool, np);
if (dvp)
vrele(dvp);
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return 0;
}
int
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smbfs_inactive(v)
void *v;
{
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struct vop_inactive_args /* {
struct vnode *a_vp;
struct thread *a_td;
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} */ *ap = v;
struct proc *p = ap->a_p;
struct ucred *cred = p->p_ucred;
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struct vnode *vp = ap->a_vp;
struct smbnode *np = VTOSMB(vp);
struct smb_cred scred;
int error;
SMBVDEBUG("%.*s: %d\n", (int) np->n_nmlen, np->n_name, vp->v_usecount);
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if (np->n_opencount) {
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error = smbfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
smb_makescred(&scred, p, cred);
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error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
&np->n_mtime, &scred);
np->n_opencount = 0;
}
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VOP_UNLOCK(vp, 0);
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return (0);
}
/*
* routines to maintain vnode attributes cache
* smbfs_attr_cacheenter: unpack np.i to vattr structure
*/
void
smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
{
struct smbnode *np = VTOSMB(vp);
int s;
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if (vp->v_type == VREG) {
if (np->n_size != fap->fa_size) {
np->n_size = fap->fa_size;
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uvm_vnp_setsize(vp, np->n_size);
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}
} else if (vp->v_type == VDIR) {
np->n_size = 16384; /* should be a better way ... */
} else
return;
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np->n_mtime = fap->fa_mtime;
np->n_dosattr = fap->fa_attr;
s = splclock();
np->n_attrage = mono_time.tv_sec;
splx(s);
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}
int
smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
{
struct smbnode *np = VTOSMB(vp);
struct smbmount *smp = VTOSMBFS(vp);
int s;
time_t diff;
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s = splclock();
diff = mono_time.tv_sec - np->n_attrage;
splx(s);
if (diff > SMBFS_ATTRTIMO) /* XXX should be configurable */
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return ENOENT;
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va->va_type = vp->v_type; /* vnode type (for create) */
if (vp->v_type == VREG) {
va->va_mode = smp->sm_args.file_mode; /* files access mode and type */
} else if (vp->v_type == VDIR) {
va->va_mode = smp->sm_args.dir_mode; /* files access mode and type */
} else
return EINVAL;
va->va_size = np->n_size;
va->va_nlink = 1; /* number of references to file */
va->va_uid = smp->sm_args.uid; /* owner user id */
va->va_gid = smp->sm_args.gid; /* owner group id */
va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
va->va_fileid = np->n_ino; /* file id */
if (va->va_fileid == 0)
va->va_fileid = 2;
va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
va->va_mtime = np->n_mtime;
va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */
va->va_gen = VNOVAL; /* generation number of file */
va->va_flags = 0; /* flags defined for file */
va->va_rdev = VNOVAL; /* device the special file represents */
va->va_bytes = va->va_size; /* bytes of disk space held by file */
va->va_filerev = 0; /* file modification number */
va->va_vaflags = 0; /* operations flags */
return 0;
}