static int
smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp)
{
struct thread *td = curthread; /* XXX */
struct smbmount *smp = VFSTOSMBFS(mp);
struct smbnode_hashhead *nhpp;
struct smbnode *np, *np2, *dnp;
struct vnode *vp;
u_long hashval;
int error;
*vpp = NULL;
if (smp->sm_root != NULL && dvp == NULL) {
SMBERROR("do not allocate root vnode twice!\n");
return EINVAL;
}
if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
if (dvp == NULL)
return EINVAL;
vp = VTOSMB(dvp)->n_parent->n_vnode;
error = vget(vp, LK_EXCLUSIVE, td);
if (error == 0)
*vpp = vp;
return error;
} else if (nmlen == 1 && name[0] == '.') {
SMBERROR("do not call me with dot!\n");
return EINVAL;
}
dnp = dvp ? VTOSMB(dvp) : NULL;
if (dnp == NULL && dvp != NULL) {
vprint("smbfs_node_alloc: dead parent vnode", dvp);
return EINVAL;
}
hashval = smbfs_hash(name, nmlen);
retry:
smbfs_hash_lock(smp, td);
loop:
nhpp = SMBFS_NOHASH(smp, hashval);
LIST_FOREACH(np, nhpp, n_hash) {
vp = SMBTOV(np);
if (np->n_parent != dnp ||
np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
continue;
VI_LOCK(vp);
smbfs_hash_unlock(smp, td);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0)
goto retry;
*vpp = vp;
return 0;
}
/*
* Lack of inode numbers leads us to the problem of generating them.
* Partially this problem can be solved by having a dir/file cache
* with inode numbers generated from the incremented by one counter.
* However this way will require too much kernel memory, gives all
* sorts of locking and consistency problems, not to mentinon counter overflows.
* So, I'm decided to use a hash function to generate pseudo random (and unique)
* inode numbers.
*/
static long
smbfs_getino(struct smbnode *dnp, const char *name, int nmlen)
{
#ifdef USE_MD5_HASH
MD5_CTX md5;
u_int32_t state[4];
long ino;
int i;
MD5Init(&md5);
MD5Update(&md5, name, nmlen);
MD5Final((u_char *)state, &md5);
for (i = 0, ino = 0; i < 4; i++)
ino += state[i];
return dnp->n_ino + ino;
#endif
u_int32_t ino;
ino = dnp->n_ino + smbfs_hash(name, nmlen);
if (ino <= 2)
ino += 3;
return ino;
}
static int
smbfs_node_alloc(struct mount *mp, struct vnode *dvp, const char *dirnm,
int dirlen, const char *name, int nmlen, char sep,
struct smbfattr *fap, struct vnode **vpp)
{
struct vattr vattr;
struct thread *td = curthread; /* XXX */
struct smbmount *smp = VFSTOSMBFS(mp);
struct smbnode *np, *dnp;
struct vnode *vp, *vp2;
struct smbcmp sc;
char *p, *rpath;
int error, rplen;
sc.n_parent = dvp;
sc.n_nmlen = nmlen;
sc.n_name = name;
if (smp->sm_root != NULL && dvp == NULL) {
SMBERROR("do not allocate root vnode twice!\n");
return EINVAL;
}
if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
if (dvp == NULL)
return EINVAL;
vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
error = vget(vp, LK_EXCLUSIVE, td);
if (error == 0)
*vpp = vp;
return error;
} else if (nmlen == 1 && name[0] == '.') {
SMBERROR("do not call me with dot!\n");
return EINVAL;
}
dnp = dvp ? VTOSMB(dvp) : NULL;
if (dnp == NULL && dvp != NULL) {
vprint("smbfs_node_alloc: dead parent vnode", dvp);
return EINVAL;
}
error = vfs_hash_get(mp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, td,
vpp, smbfs_vnode_cmp, &sc);
if (error)
return (error);
if (*vpp) {
np = VTOSMB(*vpp);
/* Force cached attributes to be refreshed if stale. */
(void)VOP_GETATTR(*vpp, &vattr, td->td_ucred);
/*
* If the file type on the server is inconsistent with
* what it was when we created the vnode, kill the
* bogus vnode now and fall through to the code below
* to create a new one with the right type.
*/
if (((*vpp)->v_type == VDIR &&
(np->n_dosattr & SMB_FA_DIR) == 0) ||
((*vpp)->v_type == VREG &&
(np->n_dosattr & SMB_FA_DIR) != 0)) {
vgone(*vpp);
vput(*vpp);
}
else {
SMBVDEBUG("vnode taken from the hashtable\n");
return (0);
}
}
/*
* If we don't have node attributes, then it is an explicit lookup
* for an existing vnode.
*/
if (fap == NULL)
return ENOENT;
error = getnewvnode("smbfs", mp, &smbfs_vnodeops, vpp);
if (error)
return (error);
vp = *vpp;
np = malloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO);
rplen = dirlen;
if (sep != '\0')
rplen++;
rplen += nmlen;
rpath = malloc(rplen + 1, M_SMBNODENAME, M_WAITOK);
p = rpath;
bcopy(dirnm, p, dirlen);
p += dirlen;
if (sep != '\0')
*p++ = sep;
if (name != NULL) {
bcopy(name, p, nmlen);
p += nmlen;
}
*p = '\0';
MPASS(p == rpath + rplen);
lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
/* Vnode initialization */
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_rpath = rpath;
np->n_rplen = rplen;
np->n_nmlen = nmlen;
np->n_name = smbfs_name_alloc(name, nmlen);
np->n_ino = fap->fa_ino;
if (dvp) {
ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc");
np->n_parent = dvp;
np->n_parentino = VTOSMB(dvp)->n_ino;
if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) {
vref(dvp);
np->n_flag |= NREFPARENT;
}
} else if (vp->v_type == VREG)
SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
error = insmntque(vp, mp);
if (error) {
free(np, M_SMBNODE);
return (error);
}
error = vfs_hash_insert(vp, smbfs_hash(name, nmlen), LK_EXCLUSIVE,
td, &vp2, smbfs_vnode_cmp, &sc);
if (error)
return (error);
if (vp2 != NULL)
*vpp = vp2;
return (0);
}
static int
smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp)
{
struct vattr vattr;
struct thread *td = curthread; /* XXX */
struct smbmount *smp = VFSTOSMBFS(mp);
struct smbnode_hashhead *nhpp;
struct smbnode *np, *np2, *dnp;
struct vnode *vp;
u_long hashval;
int error;
*vpp = NULL;
if (smp->sm_root != NULL && dvp == NULL) {
SMBERROR("do not allocate root vnode twice!\n");
return EINVAL;
}
if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
if (dvp == NULL)
return EINVAL;
vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
error = vget(vp, LK_EXCLUSIVE, td);
if (error == 0)
*vpp = vp;
return error;
} else if (nmlen == 1 && name[0] == '.') {
SMBERROR("do not call me with dot!\n");
return EINVAL;
}
dnp = dvp ? VTOSMB(dvp) : NULL;
if (dnp == NULL && dvp != NULL) {
vprint("smbfs_node_alloc: dead parent vnode", dvp);
return EINVAL;
}
hashval = smbfs_hash(name, nmlen);
retry:
smbfs_hash_lock(smp);
loop:
nhpp = SMBFS_NOHASH(smp, hashval);
LIST_FOREACH(np, nhpp, n_hash) {
vp = SMBTOV(np);
if (np->n_parent != dvp ||
np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
continue;
VI_LOCK(vp);
smbfs_hash_unlock(smp);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0)
goto retry;
/* Force cached attributes to be refreshed if stale. */
(void)VOP_GETATTR(vp, &vattr, td->td_ucred);
/*
* If the file type on the server is inconsistent with
* what it was when we created the vnode, kill the
* bogus vnode now and fall through to the code below
* to create a new one with the right type.
*/
if ((vp->v_type == VDIR && (np->n_dosattr & SMB_FA_DIR) == 0) ||
(vp->v_type == VREG && (np->n_dosattr & SMB_FA_DIR) != 0)) {
vgone(vp);
vput(vp);
break;
}
*vpp = vp;
return 0;
}