Non-GPLd ext2fs code from Manuel, unmodified.

1 files changed, 298 insertions, 0 deletions

diff --git a/sys/ufs/ext2fs/ext2fs_readwrite.c b/sys/ufs/ext2fs/ext2fs_readwrite.c
new file mode 100644
index 00000000000..a94e18deb80
--- /dev/null
+++ b/sys/ufs/ext2fs/ext2fs_readwrite.c
@@ -0,0 +1,298 @@
+/*	$NetBSD: ufs_readwrite.c,v 1.10 1997/01/30 09:52:26 tls Exp $	*/
+
+/* Modified for EXT2FS on NetBSD by Manuel Bouyer, April 1997 */
+
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  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 the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *	@(#)ufs_readwrite.c	8.8 (Berkeley) 8/4/94
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/resourcevar.h>
+#include <sys/kernel.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/buf.h>
+#include <sys/proc.h>
+#include <sys/conf.h>
+#include <sys/mount.h>
+#include <sys/vnode.h>
+#include <sys/malloc.h>
+#include <sys/signalvar.h>
+
+#include <vm/vm.h>
+
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ext2fs/ext2fs.h>
+#include <ufs/ext2fs/ext2fs_extern.h>
+
+
+#define doclusterread 0 /* XXX underway */
+#define doclusterwrite 0
+
+/*
+ * Vnode op for reading.
+ */
+/* ARGSUSED */
+int
+ext2fs_read(v)
+	void *v;
+{
+	struct vop_read_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap = v;
+	register struct vnode *vp;
+	register struct inode *ip;
+	register struct uio *uio;
+	register struct m_ext2fs *fs;
+	struct buf *bp;
+	daddr_t lbn, nextlbn;
+	off_t bytesinfile;
+	long size, xfersize, blkoffset;
+	int error;
+	u_short mode;
+
+	vp = ap->a_vp;
+	ip = VTOI(vp);
+	mode = ip->i_e2fs_mode;
+	uio = ap->a_uio;
+
+#ifdef DIAGNOSTIC
+	if (uio->uio_rw != UIO_READ)
+		panic("%s: mode", "ext2fs_read");
+
+	if (vp->v_type == VLNK) {
+		if ((int)ip->i_e2fs_size < vp->v_mount->mnt_maxsymlinklen ||
+		    (vp->v_mount->mnt_maxsymlinklen == 0 &&
+		     ip->i_e2fs_nblock == 0))
+			panic("%s: short symlink", "ext2fs_read");
+	} else if (vp->v_type != VREG && vp->v_type != VDIR)
+		panic("%s: type %d", "ext2fs_read", vp->v_type);
+#endif
+	fs = ip->i_e2fs;
+    if ((u_int64_t)uio->uio_offset >
+		((u_int64_t)0x80000000 * fs->e2fs_bsize - 1))
+		return (EFBIG);
+
+	for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
+		if ((bytesinfile = ip->i_e2fs_size - uio->uio_offset) <= 0)
+			break;
+		lbn = lblkno(fs, uio->uio_offset);
+		nextlbn = lbn + 1;
+		size = fs->e2fs_bsize;
+		blkoffset = blkoff(fs, uio->uio_offset);
+		xfersize = fs->e2fs_bsize - blkoffset;
+		if (uio->uio_resid < xfersize)
+			xfersize = uio->uio_resid;
+		if (bytesinfile < xfersize)
+			xfersize = bytesinfile;
+
+        if (lblktosize(fs, nextlbn) >= ip->i_e2fs_size)
+			error = bread(vp, lbn, size, NOCRED, &bp);
+		else if (doclusterread)
+			error = cluster_read(vp,
+			    ip->i_e2fs_size, lbn, size, NOCRED, &bp);
+		else if (lbn - 1 == vp->v_lastr) {
+			int nextsize = fs->e2fs_bsize;
+			error = breadn(vp, lbn,
+			    size, &nextlbn, &nextsize, 1, NOCRED, &bp);
+		} else
+			error = bread(vp, lbn, size, NOCRED, &bp);
+		if (error)
+			break;
+		vp->v_lastr = lbn;
+
+		/*
+		 * We should only get non-zero b_resid when an I/O error
+		 * has occurred, which should cause us to break above.
+		 * However, if the short read did not cause an error,
+		 * then we want to ensure that we do not uiomove bad
+		 * or uninitialized data.
+		 */
+		size -= bp->b_resid;
+		if (size < xfersize) {
+			if (size == 0)
+				break;
+			xfersize = size;
+		}
+		error = uiomove((char *)bp->b_data + blkoffset, (int)xfersize,
+				uio);
+		if (error)
+			break;
+		brelse(bp);
+	}
+	if (bp != NULL)
+		brelse(bp);
+	if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
+		ip->i_flag |= IN_ACCESS;
+	return (error);
+}
+
+/*
+ * Vnode op for writing.
+ */
+int
+ext2fs_write(v)
+	void *v;
+{
+	struct vop_write_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap = v;
+	register struct vnode *vp;
+	register struct uio *uio;
+	register struct inode *ip;
+	register struct m_ext2fs *fs;
+	struct buf *bp;
+	struct proc *p;
+	daddr_t lbn;
+	off_t osize;
+	int blkoffset, error, flags, ioflag, resid, size, xfersize;
+	struct timespec ts;
+
+	ioflag = ap->a_ioflag;
+	uio = ap->a_uio;
+	vp = ap->a_vp;
+	ip = VTOI(vp);
+
+#ifdef DIAGNOSTIC
+	if (uio->uio_rw != UIO_WRITE)
+		panic("%s: mode", "ext2fs_write");
+#endif
+
+	switch (vp->v_type) {
+	case VREG:
+		if (ioflag & IO_APPEND)
+			uio->uio_offset = ip->i_e2fs_size;
+		if ((ip->i_e2fs_flags & EXT2_APPEND) &&
+			uio->uio_offset != ip->i_e2fs_size)
+			return (EPERM);
+		/* FALLTHROUGH */
+	case VLNK:
+		break;
+	case VDIR:
+		if ((ioflag & IO_SYNC) == 0)
+			panic("%s: nonsync dir write", "ext2fs_write");
+		break;
+	default:
+		panic("%s: type", "ext2fs_write");
+	}
+
+	fs = ip->i_e2fs;
+	if (uio->uio_offset < 0 ||
+        (u_int64_t)uio->uio_offset + uio->uio_resid >
+		((u_int64_t)0x80000000 * fs->e2fs_bsize - 1))
+		return (EFBIG);
+	/*
+	 * Maybe this should be above the vnode op call, but so long as
+	 * file servers have no limits, I don't think it matters.
+	 */
+	p = uio->uio_procp;
+	if (vp->v_type == VREG && p &&
+	    uio->uio_offset + uio->uio_resid >
+	    p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
+		psignal(p, SIGXFSZ);
+		return (EFBIG);
+	}
+
+	resid = uio->uio_resid;
+	osize = ip->i_e2fs_size;
+	flags = ioflag & IO_SYNC ? B_SYNC : 0;
+
+	for (error = 0; uio->uio_resid > 0;) {
+		lbn = lblkno(fs, uio->uio_offset);
+		blkoffset = blkoff(fs, uio->uio_offset);
+		xfersize = fs->e2fs_bsize - blkoffset;
+		if (uio->uio_resid < xfersize)
+			xfersize = uio->uio_resid;
+		if (fs->e2fs_bsize > xfersize)
+			flags |= B_CLRBUF;
+		else
+			flags &= ~B_CLRBUF;
+
+        error = ext2fs_balloc(ip,
+		    lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
+		if (error)
+			break;
+		if (uio->uio_offset + xfersize > ip->i_e2fs_size) {
+			ip->i_e2fs_size = uio->uio_offset + xfersize;
+			vnode_pager_setsize(vp, (u_long)ip->i_e2fs_size);
+		}
+		(void)vnode_pager_uncache(vp);
+
+		size = fs->e2fs_bsize - bp->b_resid;
+		if (size < xfersize)
+			xfersize = size;
+
+		error =
+		    uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
+		if (ioflag & IO_SYNC)
+			(void)bwrite(bp);
+		else if (xfersize + blkoffset == fs->e2fs_bsize)
+			if (doclusterwrite)
+				cluster_write(bp, ip->i_e2fs_size);
+			else
+				bawrite(bp);
+		else
+			bdwrite(bp);
+		if (error || xfersize == 0)
+			break;
+		ip->i_flag |= IN_CHANGE | IN_UPDATE;
+	}
+	/*
+	 * If we successfully wrote any data, and we are not the superuser
+	 * we clear the setuid and setgid bits as a precaution against
+	 * tampering.
+	 */
+	if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
+		ip->i_e2fs_mode &= ~(ISUID | ISGID);
+	if (error) {
+		if (ioflag & IO_UNIT) {
+			(void)VOP_TRUNCATE(vp, osize,
+			    ioflag & IO_SYNC, ap->a_cred, uio->uio_procp);
+			uio->uio_offset -= resid - uio->uio_resid;
+			uio->uio_resid = resid;
+		}
+	} else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) {
+		TIMEVAL_TO_TIMESPEC(&time, &ts);
+		error = VOP_UPDATE(vp, &ts, &ts, 1);
+	}
+	return (error);
+}