Annotation of prex/usr/server/fs/vfs/vfs_lookup.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * lookup.c - vnode lookup function.
! 32: */
! 33:
! 34: #include <sys/vnode.h>
! 35: #include <sys/mount.h>
! 36:
! 37: #include <limits.h>
! 38: #include <unistd.h>
! 39: #include <string.h>
! 40: #include <errno.h>
! 41:
! 42: #include <stdlib.h>
! 43:
! 44: #include "vfs.h"
! 45:
! 46: /*
! 47: * Convert a pathname into a pointer to a locked vnode.
! 48: * @path: full path name.
! 49: * @vpp: vnode to be returned.
! 50: */
! 51: int
! 52: namei(char *path, vnode_t *vpp)
! 53: {
! 54: char *p;
! 55: char node[PATH_MAX];
! 56: char name[PATH_MAX];
! 57: mount_t mp;
! 58: vnode_t dvp, vp;
! 59: int err, i;
! 60:
! 61: DPRINTF(VFSDB_VNODE, ("namei: path=%s\n", path));
! 62:
! 63: /*
! 64: * Convert a full path name to its mount point and
! 65: * the local node in the file system.
! 66: */
! 67: if (vfs_findroot(path, &mp, &p))
! 68: return ENOTDIR;
! 69: strcpy(node, "/");
! 70: strlcat(node, p, PATH_MAX);
! 71: vp = vn_lookup(mp, node);
! 72: if (vp) {
! 73: /* vnode is already active. */
! 74: *vpp = vp;
! 75: return 0;
! 76: }
! 77: /*
! 78: * Find target vnode, started from root directory.
! 79: * This is done to attach the fs specific data to
! 80: * the target vnode.
! 81: */
! 82: if ((dvp = mp->m_root) == NULL)
! 83: sys_panic("VFS: no root");
! 84:
! 85: vref(dvp);
! 86: vn_lock(dvp);
! 87: node[0] = '\0';
! 88:
! 89: while (*p != '\0') {
! 90: /*
! 91: * Get lower directory/file name.
! 92: */
! 93: while (*p == '/')
! 94: p++;
! 95: for (i = 0; i < PATH_MAX; i++) {
! 96: if (*p == '\0' || *p == '/')
! 97: break;
! 98: name[i] = *p++;
! 99: }
! 100: name[i] = '\0';
! 101:
! 102: /*
! 103: * Get a vnode for the target.
! 104: */
! 105: strlcat(node, "/", PATH_MAX);
! 106: strlcat(node, name, PATH_MAX);
! 107: vp = vn_lookup(mp, node);
! 108: if (vp == NULL) {
! 109: vp = vget(mp, node);
! 110: if (vp == NULL) {
! 111: vput(dvp);
! 112: return ENOMEM;
! 113: }
! 114: /* Find a vnode in this directory. */
! 115: err = VOP_LOOKUP(dvp, name, vp);
! 116: if (err || (*p == '/' && vp->v_type != VDIR)) {
! 117: /* Not found */
! 118: vput(vp);
! 119: vput(dvp);
! 120: return err;
! 121: }
! 122: }
! 123: vput(dvp);
! 124: dvp = vp;
! 125: while (*p != '\0' && *p != '/')
! 126: p++;
! 127: }
! 128: *vpp = vp;
! 129: return 0;
! 130: }
! 131:
! 132: /*
! 133: * Search a pathname.
! 134: * @path: full path.
! 135: * @vpp: pointer to locked vnode for directory.
! 136: * @name: pointer to file name in path.
! 137: *
! 138: * This is a very central but not so complicated routine. ;-P
! 139: * This routine returns a locked directory vnode and file name.
! 140: */
! 141: int
! 142: lookup(char *path, vnode_t *vpp, char **name)
! 143: {
! 144: char buf[PATH_MAX];
! 145: char root[] = "/";
! 146: char *file, *dir;
! 147: vnode_t vp;
! 148: int err;
! 149:
! 150: DPRINTF(VFSDB_VNODE, ("lookup: path=%s\n", path));
! 151:
! 152: /*
! 153: * Get the path for directory.
! 154: */
! 155: strcpy(buf, path);
! 156: file = strrchr(buf, '/');
! 157: if (!buf[0])
! 158: return ENOTDIR;
! 159: if (file == buf)
! 160: dir = root;
! 161: else {
! 162: *file = '\0';
! 163: dir = buf;
! 164: }
! 165: /*
! 166: * Get the vnode for directory
! 167: */
! 168: if ((err = namei(dir, &vp)) != 0)
! 169: return err;
! 170: if (vp->v_type != VDIR) {
! 171: vput(vp);
! 172: return ENOTDIR;
! 173: }
! 174: *vpp = vp;
! 175:
! 176: /*
! 177: * Get the file name
! 178: */
! 179: *name = strrchr(path, '/') + 1;
! 180: return 0;
! 181: }
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