projects / mirror_zfs.git / blame
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1 | /* |
| 2 | * CDDL HEADER START | |
| 3 | * | |
| 4 | * The contents of this file are subject to the terms of the | |
| 5 | * Common Development and Distribution License (the "License"). | |
| 6 | * You may not use this file except in compliance with the License. | |
| 7 | * | |
| 8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
| 9 | * or http://www.opensolaris.org/os/licensing. | |
| 10 | * See the License for the specific language governing permissions | |
| 11 | * and limitations under the License. | |
| 12 | * | |
| 13 | * When distributing Covered Code, include this CDDL HEADER in each | |
| 14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
| 15 | * If applicable, add the following below this CDDL HEADER, with the | |
| 16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
| 17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
| 18 | * | |
| 19 | * CDDL HEADER END | |
| 20 | */ | |
| 21 | /* | |
| 22 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. | |
| 23 | * Use is subject to license terms. | |
| 24 | */ | |
| 25 | ||
| 26 | /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ | |
| 27 | /* All Rights Reserved */ | |
| 28 | ||
| 29 | /* | |
| 30 | * University Copyright- Copyright (c) 1982, 1986, 1988 | |
| 31 | * The Regents of the University of California | |
| 32 | * All Rights Reserved | |
| 33 | * | |
| 34 | * University Acknowledgment- Portions of this document are derived from | |
| 35 | * software developed by the University of California, Berkeley, and its | |
| 36 | * contributors. | |
| 37 | */ | |
| 38 | ||
| 39 | ||
| 40 | #include <sys/types.h> | |
| 41 | #include <sys/systm.h> | |
| 42 | #include <sys/pathname.h> | |
| 43 | #include <sys/kmem.h> | |
| 44 | ||
| 45 | /* | |
| 46 | * Pathname utilities. | |
| 47 | * | |
| 48 | * In translating file names we copy each argument file | |
| 49 | * name into a pathname structure where we operate on it. | |
| 50 | * Each pathname structure can hold "pn_bufsize" characters | |
| 51 | * including a terminating null, and operations here support | |
| 52 | * allocating and freeing pathname structures, fetching | |
| 53 | * strings from user space, getting the next character from | |
| 54 | * a pathname, combining two pathnames (used in symbolic | |
| 55 | * link processing), and peeling off the first component | |
| 56 | * of a pathname. | |
| 57 | */ | |
| 58 | ||
| 59 | /* | |
| 60 | * Allocate contents of pathname structure. Structure is typically | |
| 61 | * an automatic variable in calling routine for convenience. | |
| 62 | * | |
| 63 | * May sleep in the call to kmem_alloc() and so must not be called | |
| 64 | * from interrupt level. | |
| 65 | */ | |
| 66 | void | |
| 67 | pn_alloc(struct pathname *pnp) | |
| 68 | { | |
| 69 | pn_alloc_sz(pnp, MAXPATHLEN); | |
| 70 | } | |
| 71 | void | |
| 72 | pn_alloc_sz(struct pathname *pnp, size_t sz) | |
| 73 | { | |
| 74 | pnp->pn_path = pnp->pn_buf = kmem_alloc(sz, KM_SLEEP); | |
| 75 | pnp->pn_pathlen = 0; | |
| 76 | pnp->pn_bufsize = sz; | |
| 77 | } | |
| 78 | ||
| 79 | /* | |
| 80 | * Free pathname resources. | |
| 81 | */ | |
| 82 | void | |
| 83 | pn_free(struct pathname *pnp) | |
| 84 | { | |
| 85 | /* pn_bufsize is usually MAXPATHLEN, but may not be */ | |
| 86 | kmem_free(pnp->pn_buf, pnp->pn_bufsize); | |
| 87 | pnp->pn_path = pnp->pn_buf = NULL; | |
| 88 | pnp->pn_pathlen = pnp->pn_bufsize = 0; | |
| 89 | } |