Import kernel part of ncplib: netncp and nwfs

Reviewed by:	msmith, peter
Obtained from:	ncplib

1 files changed, 321 insertions, 0 deletions

diff --git a/sys/fs/nwfs/nwfs_node.c b/sys/fs/nwfs/nwfs_node.c
new file mode 100644
index 0000000..55e19b7
--- /dev/null
+++ b/sys/fs/nwfs/nwfs_node.c
@@ -0,0 +1,321 @@
+/*
+ * Copyright (c) 1999, 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.
+ *
+ * $FreeBSD$
+ */
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/malloc.h>
+#include <sys/sysctl.h>
+#include <vm/vm.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_prot.h>
+#include <vm/vm_page.h>
+#include <vm/vm_object.h>
+#include <vm/vm_pager.h>
+#include <vm/vnode_pager.h>
+#include <vm/vm_zone.h>
+#include <sys/queue.h>
+
+#include <netncp/ncp.h>
+#include <netncp/ncp_conn.h>
+#include <netncp/ncp_subr.h>
+
+#include <nwfs/nwfs.h>
+#include <nwfs/nwfs_mount.h>
+#include <nwfs/nwfs_node.h>
+#include <nwfs/nwfs_subr.h>
+
+#define	NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
+
+extern vop_t **nwfs_vnodeop_p;
+
+static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
+static u_long nwnodehash;
+static int nwhashlock = 0;
+
+MALLOC_DEFINE(M_NWNODE, "NWFS node", "NWFS vnode private part");
+MALLOC_DEFINE(M_NWFSHASH, "NWFS hash", "NWFS has table");
+
+static int nwfs_sysctl_vnprint SYSCTL_HANDLER_ARGS;
+
+extern struct linker_set sysctl_vfs_nwfs;
+
+SYSCTL_DECL(_vfs_nwfs);
+
+SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
+	    NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
+
+void
+nwfs_hash_init(void) {
+	nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
+}
+
+void
+nwfs_hash_free(void) {
+	free(nwhashtbl, M_NWFSHASH);
+}
+
+int
+nwfs_sysctl_vnprint SYSCTL_HANDLER_ARGS {
+	struct nwnode *np;
+	struct nwnode_hash_head *nhpp;
+	struct vnode *vp;
+	int i;
+
+	if (nwfs_debuglevel == 0)
+		return 0;
+	printf("Name:uc:hc:fid:pfid\n");
+	for(i = 0; i <= nwnodehash; i++) {
+		nhpp = &nwhashtbl[i];
+		for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
+			vp = NWTOV(np);
+			printf("%s:%d:%d:%d:%d\n",np->n_name,vp->v_usecount,vp->v_holdcnt,
+			    np->n_fid.f_id, np->n_fid.f_parent);
+		}
+	}
+	return 0;
+}
+
+/*
+ * Allocate new nwfsnode/vnode from given nwnode. 
+ * Vnode referenced and not locked.
+ */
+int
+nwfs_allocvp(struct mount *mp, ncpfid fid, struct vnode **vpp) {
+	struct proc *p = curproc;	/* XXX */
+	struct nwnode *np, *np2;
+	struct nwnode_hash_head *nhpp;
+	struct vnode *vp;
+	int error;
+
+retry:
+	nhpp = NWNOHASH(fid);
+loop:
+	for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
+		vp = NWTOV(np);
+		if (mp != vp->v_mount || !NWCMPF(&fid, &np->n_fid))
+			continue;
+		if (vget(vp, LK_EXCLUSIVE, p))
+			goto loop;
+		*vpp = vp;
+		return(0);
+	}
+
+	/* lock list, or waiting in malloc can cause problems */
+	if (nwhashlock) {
+		while(nwhashlock) {
+			nwhashlock = -1;
+			tsleep((caddr_t) &nwhashlock, PVM, "nwfsvp", 0);
+		}
+		goto loop;
+	}
+	nwhashlock = 1;
+	/*
+	 * Do the MALLOC before the getnewvnode since doing so afterward
+	 * might cause a bogus v_data pointer to get dereferenced
+	 * elsewhere if MALLOC should block.
+	 */
+	MALLOC(np, struct nwnode *, sizeof *np, M_NWNODE, M_WAITOK);
+	error = getnewvnode(VT_NWFS, mp, nwfs_vnodeop_p, &vp);
+	if (error) {
+		if (nwhashlock < 0)
+			wakeup(&nwhashlock);
+		nwhashlock = 0;
+		*vpp = 0;
+		FREE(np, M_NWNODE);
+		return (error);
+	}
+	*vpp = vp;
+	bzero(np,sizeof(*np));
+	vp->v_data = np;
+	np->n_vnode = vp;
+	np->n_mount = VFSTONWFS(mp);
+	np->n_fid = fid;
+	for (np2 = nhpp->lh_first; np2 != 0; np2 = np->n_hash.le_next) {
+		if (mp != NWTOV(np2)->v_mount || !NWCMPF(&fid, &np2->n_fid))
+			continue;
+		vrele(vp);
+		FREE(np, M_NWNODE);
+		if (nwhashlock < 0)
+			wakeup(&nwhashlock);
+		nwhashlock = 0;
+		goto retry;
+	}
+	LIST_INSERT_HEAD(nhpp, np, n_hash);
+	if (nwhashlock < 0)
+		wakeup(&nwhashlock);
+	nwhashlock = 0;
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	np->n_flag |= NNEW;
+	return (error);
+}
+
+int
+nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct nwnode **npp) {
+	struct nwnode *np;
+	struct nwnode_hash_head *nhpp;
+
+	nhpp = NWNOHASH(fid);
+	for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
+		if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
+			continue;
+		*npp = np;
+		return(0);
+	}
+	return ENOENT;
+}
+
+/*
+ * Free nwnode, and give vnode back to system
+ */
+int
+nwfs_reclaim(ap)                     
+        struct vop_reclaim_args /* {
+        struct vnode *a_vp;
+        } */ *ap;
+{
+	struct vnode *dvp = NULL, *vp = ap->a_vp;
+	struct nwnode *dnp, *np = VTONW(vp);
+	struct nwmount *nmp=VTONWFS(vp);
+	
+	NCPVNDEBUG("%s,%d\n", np->n_name, vp->v_usecount);
+	if (np->n_refparent) {
+		np->n_refparent = 0;
+		if (nwfs_lookupnp(nmp, np->n_parent, &dnp) == 0) {
+			dvp = dnp->n_vnode;
+		} else {
+			NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
+		}
+	}
+	LIST_REMOVE(np, n_hash);
+	cache_purge(vp);
+	if (nmp->n_root == np) {
+		nmp->n_root = NULL;
+	}
+	vp->v_data = NULL;
+	FREE(np, M_NWNODE);
+	if (dvp) {
+		vrele(dvp);
+	}
+	return (0);
+}
+
+int
+nwfs_inactive(ap)
+	struct vop_inactive_args /* {
+		struct vnode *a_vp;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct proc *p = ap->a_p;
+	struct ucred *cred = p->p_ucred;
+	struct vnode *vp = ap->a_vp;
+	struct nwnode *np = VTONW(vp);
+	int error;
+
+	NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vp->v_usecount);
+	if (np->opened) {
+		error = nwfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
+		error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, p, cred);
+		np->opened = 0;
+	}
+	VOP_UNLOCK(vp, 0, p);
+	return (0);
+}
+/*
+ * routines to maintain vnode attributes cache
+ * nwfs_attr_cacheenter: unpack np.i to va structure
+ */
+void
+nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi) {
+	struct nwnode *np = VTONW(vp);
+	struct nwmount *nmp = VTONWFS(vp);
+	register struct vattr *va = &np->n_vattr;
+
+	va->va_type = vp->v_type;		/* vnode type (for create) */
+	if (vp->v_type == VREG) {
+		if (va->va_size != fi->dataStreamSize) {
+			va->va_size = fi->dataStreamSize;
+			vnode_pager_setsize(vp, va->va_size);
+		}
+		va->va_mode = nmp->m.file_mode;	/* files access mode and type */
+	} else if (vp->v_type == VDIR) {
+		va->va_size = 16384; 		/* should be a better way ... */
+		va->va_mode = nmp->m.dir_mode;	/* files access mode and type */
+	} else
+		return;
+	np->n_size = va->va_size;
+	va->va_nlink = 1;		/* number of references to file */
+	va->va_uid = nmp->m.uid;	/* owner user id */
+	va->va_gid = nmp->m.gid;	/* owner group id */
+	va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
+	va->va_fileid = np->n_fid.f_id;	/* file id */
+	if (va->va_fileid == 0)
+		va->va_fileid = NWFS_ROOT_INO;
+	va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
+	/* time of last modification */
+	ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, &va->va_mtime);
+	/* time of last access */
+	ncp_dos2unixtime(fi->lastAccessDate, 0, 0, &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 */
+	np->n_vattr = *va;
+	if (np->n_mtime == 0) {
+		np->n_mtime = va->va_mtime.tv_sec;
+	}
+	np->n_atime = time_second;
+	return;
+}
+
+int
+nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va) {
+	struct nwnode *np = VTONW(vp);
+	int diff;
+
+	diff = time_second - np->n_atime;
+	if (diff > 2) {	/* XXX should be configurable */
+		return ENOENT;
+	}
+	*va = np->n_vattr;
+	return 0;
+}