X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/849cbd39568bf29e4eaab12b5974fdc2f038b78c..8e6cd80742edef90616619006ea229b59b75bf57:/usr/src/sys/kern/vfs_vnops.c

diff --git a/usr/src/sys/kern/vfs_vnops.c b/usr/src/sys/kern/vfs_vnops.c
index 2f1f00384b..71548ff668 100644
--- a/usr/src/sys/kern/vfs_vnops.c
+++ b/usr/src/sys/kern/vfs_vnops.c
@@ -1,148 +1,388 @@
 /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * All rights reserved.
  *
- *	@(#)vfs_vnops.c	7.3 (Berkeley) %G%
+ * %sccs.include.redist.c%
+ *
+ *	@(#)vfs_vnops.c	7.29 (Berkeley) %G%
  */
 
 #include "param.h"
 #include "systm.h"
-#include "dir.h"
-#include "user.h"
-#include "fs.h"
+#include "kernel.h"
 #include "file.h"
-#include "conf.h"
-#include "inode.h"
-#include "acct.h"
-#include "mount.h"
-#include "socket.h"
-#include "socketvar.h"
+#include "stat.h"
+#include "buf.h"
 #include "proc.h"
+#include "mount.h"
+#include "namei.h"
+#include "vnode.h"
+#include "ioctl.h"
+#include "tty.h"
 
-#include "machine/reg.h"
+struct 	fileops vnops =
+	{ vn_read, vn_write, vn_ioctl, vn_select, vn_close };
 
 /*
- * Check mode permission on inode pointer.
- * Mode is READ, WRITE or EXEC.
- * In the case of WRITE, the
- * read-only status of the file
- * system is checked.
- * Also in WRITE, prototype text
- * segments cannot be written.
- * The mode is shifted to select
- * the owner/group/other fields.
- * The super user is granted all
- * permissions.
+ * Common code for vnode open operations.
+ * Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
  */
-access(ip, mode)
-	register struct inode *ip;
-	int mode;
+vn_open(ndp, p, fmode, cmode)
+	register struct nameidata *ndp;
+	struct proc *p;
+	int fmode, cmode;
 {
-	register m;
-	register gid_t *gp;
-
-	m = mode;
-	if (m == IWRITE) {
-		/*
-		 * Disallow write attempts on read-only
-		 * file systems; unless the file is a block
-		 * or character device resident on the
-		 * file system.
-		 */
-		if (ip->i_fs->fs_ronly != 0) {
-			if ((ip->i_mode & IFMT) != IFCHR &&
-			    (ip->i_mode & IFMT) != IFBLK) {
-				u.u_error = EROFS;
-				return (1);
+	register struct vnode *vp;
+	register struct ucred *cred = p->p_ucred;
+	struct vattr vat;
+	struct vattr *vap = &vat;
+	int error;
+
+	if (fmode & FCREAT) {
+		ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF;
+		if ((fmode & FEXCL) == 0)
+			ndp->ni_nameiop |= FOLLOW;
+		if (error = namei(ndp, p))
+			return (error);
+		if (ndp->ni_vp == NULL) {
+			VATTR_NULL(vap);
+			vap->va_type = VREG;
+			vap->va_mode = cmode;
+			if (error = VOP_CREATE(ndp, vap, p))
+				return (error);
+			fmode &= ~FTRUNC;
+			vp = ndp->ni_vp;
+		} else {
+			if (ndp->ni_dvp == ndp->ni_vp)
+				vrele(ndp->ni_dvp);
+			else
+				vput(ndp->ni_dvp);
+			ndp->ni_dvp = NULL;
+			vp = ndp->ni_vp;
+			if (fmode & FEXCL) {
+				error = EEXIST;
+				goto bad;
 			}
+			fmode &= ~FCREAT;
 		}
-		/*
-		 * If there's shared text associated with
-		 * the inode, try to free it up once.  If
-		 * we fail, we can't allow writing.
-		 */
-		if (ip->i_flag&ITEXT)
-			xrele(ip);
-		if (ip->i_flag & ITEXT) {
-			u.u_error = ETXTBSY;
-			return (1);
+	} else {
+		ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
+		if (error = namei(ndp, p))
+			return (error);
+		vp = ndp->ni_vp;
+	}
+	if (vp->v_type == VSOCK) {
+		error = EOPNOTSUPP;
+		goto bad;
+	}
+	if ((fmode & FCREAT) == 0) {
+		if (fmode & FREAD) {
+			if (error = VOP_ACCESS(vp, VREAD, cred, p))
+				goto bad;
+		}
+		if (fmode & (FWRITE|FTRUNC)) {
+			if (vp->v_type == VDIR) {
+				error = EISDIR;
+				goto bad;
+			}
+			if ((error = vn_writechk(vp)) ||
+			    (error = VOP_ACCESS(vp, VWRITE, cred, p)))
+				goto bad;
 		}
 	}
+	if (fmode & FTRUNC) {
+		VATTR_NULL(vap);
+		vap->va_size = 0;
+		if (error = VOP_SETATTR(vp, vap, cred, p))
+			goto bad;
+	}
+	VOP_UNLOCK(vp);
+	error = VOP_OPEN(vp, fmode, cred, p);
+	if (error)
+		vrele(vp);
+	return (error);
+
+bad:
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Check for write permissions on the specified vnode.
+ * The read-only status of the file system is checked.
+ * Also, prototype text segments cannot be written.
+ */
+vn_writechk(vp)
+	register struct vnode *vp;
+{
+
 	/*
-	 * If you're the super-user,
-	 * you always get access.
+	 * Disallow write attempts on read-only file systems;
+	 * unless the file is a socket or a block or character
+	 * device resident on the file system.
 	 */
-	if (u.u_uid == 0)
-		return (0);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY) {
+		switch (vp->v_type) {
+		case VREG: case VDIR: case VLNK:
+			return (EROFS);
+		}
+	}
 	/*
-	 * Access check is based on only
-	 * one of owner, group, public.
-	 * If not owner, then check group.
-	 * If not a member of the group, then
-	 * check public access.
+	 * If there's shared text associated with
+	 * the vnode, try to free it up once.  If
+	 * we fail, we can't allow writing.
 	 */
-	if (u.u_uid != ip->i_uid) {
-		m >>= 3;
-		if (u.u_gid == ip->i_gid)
-			goto found;
-		gp = u.u_groups;
-		for (; gp < &u.u_groups[NGROUPS] && *gp != NOGROUP; gp++)
-			if (ip->i_gid == *gp)
-				goto found;
-		m >>= 3;
-found:
-		;
-	}
-	if ((ip->i_mode&m) != 0)
-		return (0);
-	u.u_error = EACCES;
-	return (1);
+	if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp))
+		return (ETXTBSY);
+	return (0);
 }
 
 /*
- * Look up a pathname and test if
- * the resultant inode is owned by the
- * current user.
- * If not, try for super-user.
- * If permission is granted,
- * return inode pointer.
+ * Vnode version of rdwri() for calls on file systems.
  */
-struct inode *
-owner(fname, follow)
-	caddr_t fname;
-	int follow;
+vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p)
+	enum uio_rw rw;
+	struct vnode *vp;
+	caddr_t base;
+	int len;
+	off_t offset;
+	enum uio_seg segflg;
+	int ioflg;
+	struct ucred *cred;
+	int *aresid;
+	struct proc *p;
 {
-	register struct inode *ip;
-	register struct nameidata *ndp = &u.u_nd;
-
-	ndp->ni_nameiop = LOOKUP | follow;
-	ndp->ni_segflg = UIO_USERSPACE;
-	ndp->ni_dirp = fname;
-	ip = namei(ndp);
-	if (ip == NULL)
-		return (NULL);
-	if (u.u_uid == ip->i_uid)
-		return (ip);
-	if (u.u_error = suser(u.u_cred, &u.u_acflag)) {
-		iput(ip);
-		return (NULL);
-	}
-	return (ip);
+	struct uio auio;
+	struct iovec aiov;
+	int error;
+
+	if ((ioflg & IO_NODELOCKED) == 0)
+		VOP_LOCK(vp);
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	aiov.iov_base = base;
+	aiov.iov_len = len;
+	auio.uio_resid = len;
+	auio.uio_offset = offset;
+	auio.uio_segflg = segflg;
+	auio.uio_rw = rw;
+	auio.uio_procp = p;
+	if (rw == UIO_READ)
+		error = VOP_READ(vp, &auio, ioflg, cred);
+	else
+		error = VOP_WRITE(vp, &auio, ioflg, cred);
+	if (aresid)
+		*aresid = auio.uio_resid;
+	else
+		if (auio.uio_resid && error == 0)
+			error = EIO;
+	if ((ioflg & IO_NODELOCKED) == 0)
+		VOP_UNLOCK(vp);
+	return (error);
+}
+
+vn_read(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int count, error;
+
+	VOP_LOCK(vp);
+	uio->uio_offset = fp->f_offset;
+	count = uio->uio_resid;
+	error = VOP_READ(vp, uio, (fp->f_flag & FNDELAY) ? IO_NDELAY : 0, cred);
+	fp->f_offset += count - uio->uio_resid;
+	VOP_UNLOCK(vp);
+	return (error);
+}
+
+vn_write(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int count, error, ioflag = 0;
+
+	if (vp->v_type == VREG && (fp->f_flag & FAPPEND))
+		ioflag |= IO_APPEND;
+	if (fp->f_flag & FNDELAY)
+		ioflag |= IO_NDELAY;
+	VOP_LOCK(vp);
+	uio->uio_offset = fp->f_offset;
+	count = uio->uio_resid;
+	error = VOP_WRITE(vp, uio, ioflag, cred);
+	if (ioflag & IO_APPEND)
+		fp->f_offset = uio->uio_offset;
+	else
+		fp->f_offset += count - uio->uio_resid;
+	VOP_UNLOCK(vp);
+	return (error);
+}
+
+/*
+ * Get stat info for a vnode.
+ */
+vn_stat(vp, sb, p)
+	struct vnode *vp;
+	register struct stat *sb;
+	struct proc *p;
+{
+	struct vattr vattr;
+	register struct vattr *vap;
+	int error;
+	u_short mode;
+
+	vap = &vattr;
+	error = VOP_GETATTR(vp, vap, p->p_ucred, p);
+	if (error)
+		return (error);
+	/*
+	 * Copy from vattr table
+	 */
+	sb->st_dev = vap->va_fsid;
+	sb->st_ino = vap->va_fileid;
+	mode = vap->va_mode;
+	switch (vp->v_type) {
+	case VREG:
+		mode |= S_IFREG;
+		break;
+	case VDIR:
+		mode |= S_IFDIR;
+		break;
+	case VBLK:
+		mode |= S_IFBLK;
+		break;
+	case VCHR:
+		mode |= S_IFCHR;
+		break;
+	case VLNK:
+		mode |= S_IFLNK;
+		break;
+	case VSOCK:
+		mode |= S_IFSOCK;
+		break;
+	case VFIFO:
+		mode |= S_IFIFO;
+		break;
+	default:
+		return (EBADF);
+	};
+	sb->st_mode = mode;
+	sb->st_nlink = vap->va_nlink;
+	sb->st_uid = vap->va_uid;
+	sb->st_gid = vap->va_gid;
+	sb->st_rdev = vap->va_rdev;
+	sb->st_size = vap->va_size;
+	sb->st_atime = vap->va_atime.tv_sec;
+	sb->st_spare1 = 0;
+	sb->st_mtime = vap->va_mtime.tv_sec;
+	sb->st_spare2 = 0;
+	sb->st_ctime = vap->va_ctime.tv_sec;
+	sb->st_spare3 = 0;
+	sb->st_blksize = vap->va_blocksize;
+	sb->st_flags = vap->va_flags;
+	sb->st_gen = vap->va_gen;
+	sb->st_blocks = vap->va_bytes / S_BLKSIZE;
+	return (0);
 }
 
 /*
- * Test if the current user is the super user.
+ * Vnode ioctl call
  */
-suser(uid, acflag)
-	uid_t uid;
-	short *acflag;
+vn_ioctl(fp, com, data, p)
+	struct file *fp;
+	int com;
+	caddr_t data;
+	struct proc *p;
 {
+	register struct vnode *vp = ((struct vnode *)fp->f_data);
+	struct vattr vattr;
+	int error;
+
+	switch (vp->v_type) {
+
+	case VREG:
+	case VDIR:
+		if (com == FIONREAD) {
+			if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
+				return (error);
+			*(off_t *)data = vattr.va_size - fp->f_offset;
+			return (0);
+		}
+		if (com == FIONBIO || com == FIOASYNC)	/* XXX */
+			return (0);			/* XXX */
+		/* fall into ... */
+
+	default:
+		return (ENOTTY);
 
-	if (uid == 0) {
-		if (acflag)
-			*acflag |= ASU;
-		return (0);
+	case VFIFO:
+	case VCHR:
+	case VBLK:
+		error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p);
+		if (error == 0 && com == TIOCSCTTY) {
+			p->p_session->s_ttyvp = vp;
+			VREF(vp);
+		}
+		return (error);
 	}
-	return (EPERM);
+}
+
+/*
+ * Vnode select call
+ */
+vn_select(fp, which, p)
+	struct file *fp;
+	int which;
+	struct proc *p;
+{
+
+	return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag,
+		p->p_ucred, p));
+}
+
+/*
+ * Vnode close call
+ */
+vn_close(fp, p)
+	register struct file *fp;
+	struct proc *p;
+{
+	struct vnode *vp = ((struct vnode *)fp->f_data);
+	int error;
+
+	/*
+	 * Must delete vnode reference from this file entry
+	 * before VOP_CLOSE, so that only other references
+	 * will prevent close.
+	 */
+	fp->f_data = (caddr_t) 0;
+	error = VOP_CLOSE(vp, fp->f_flag, fp->f_cred, p);
+	vrele(vp);
+	return (error);
+}
+
+/*
+ * vn_fhtovp() - convert a fh to a vnode ptr (optionally locked)
+ * 	- look up fsid in mount list (if not found ret error)
+ *	- get vp by calling VFS_FHTOVP() macro
+ *	- if lockflag lock it with VOP_LOCK()
+ */
+vn_fhtovp(fhp, lockflag, vpp)
+	fhandle_t *fhp;
+	int lockflag;
+	struct vnode **vpp;
+{
+	register struct mount *mp;
+
+	if ((mp = getvfs(&fhp->fh_fsid)) == NULL)
+		return (ESTALE);
+	if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp))
+		return (ESTALE);
+	if (!lockflag)
+		VOP_UNLOCK(*vpp);
+	return (0);
 }