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struct pathname is originally from Solaris VFS, and it has been used in ZoL to merely call VOP from Linux VFS interface without API change, therefore pathname::pn_path* are unused and unneeded. Technically, struct pathname is a wrapper for C string in ZoL. Saves stack a bit on lookup and unlink. (#if0'd members instead of removing since comments refer to them.) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com> Closes #9025
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/*
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* University Copyright- Copyright (c) 1982, 1986, 1988
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* The Regents of the University of California
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* All Rights Reserved
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*
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* University Acknowledgment- Portions of this document are derived from
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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#include <sys/types.h>
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#include <sys/pathname.h>
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#include <sys/kmem.h>
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#include <sys/sysmacros.h>
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/*
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* Pathname utilities.
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*
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* In translating file names we copy each argument file
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* name into a pathname structure where we operate on it.
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* Each pathname structure can hold "pn_bufsize" characters
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* including a terminating null, and operations here support
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* allocating and freeing pathname structures, fetching
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* strings from user space, getting the next character from
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* a pathname, combining two pathnames (used in symbolic
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* link processing), and peeling off the first component
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* of a pathname.
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*/
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/*
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* Allocate contents of pathname structure. Structure is typically
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* an automatic variable in calling routine for convenience.
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*
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* May sleep in the call to kmem_alloc() and so must not be called
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* from interrupt level.
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*/
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void
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pn_alloc(struct pathname *pnp)
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{
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pn_alloc_sz(pnp, MAXPATHLEN);
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}
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void
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pn_alloc_sz(struct pathname *pnp, size_t sz)
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{
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pnp->pn_buf = kmem_alloc(sz, KM_SLEEP);
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pnp->pn_bufsize = sz;
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#if 0 /* unused in ZoL */
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pnp->pn_path = pnp->pn_buf;
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pnp->pn_pathlen = 0;
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#endif
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}
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/*
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* Free pathname resources.
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*/
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void
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pn_free(struct pathname *pnp)
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{
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/* pn_bufsize is usually MAXPATHLEN, but may not be */
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kmem_free(pnp->pn_buf, pnp->pn_bufsize);
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pnp->pn_buf = NULL;
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pnp->pn_bufsize = 0;
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#if 0 /* unused in ZoL */
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pnp->pn_path = NULL;
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pnp->pn_pathlen = 0;
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#endif
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}
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