c32d0a1dcd
Smarter use of devfs_allocv() (from bp@) Introduce devfs_find() ".." fixes to devfs_lookup (from bp@)
272 lines
6.3 KiB
C
272 lines
6.3 KiB
C
#define DEBUG 1
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/*
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* Copyright (c) 2000
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* Poul-Henning Kamp. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/dirent.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/eventhandler.h>
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#include <sys/ctype.h>
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#define DEVFS_INTERN
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#include <fs/devfs/devfs.h>
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struct devfs_dirent *
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devfs_find(struct devfs_dirent *dd, const char *name, int namelen)
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{
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struct devfs_dirent *de;
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TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
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if (namelen != de->de_dirent->d_namlen)
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continue;
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if (bcmp(name, de->de_dirent->d_name, namelen) != 0)
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continue;
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break;
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}
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return (de);
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}
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struct devfs_dirent *
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devfs_newdirent(char *name, int namelen)
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{
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int i;
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struct devfs_dirent *de;
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struct dirent d;
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d.d_namlen = namelen;
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i = sizeof (*de) + GENERIC_DIRSIZ(&d);
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MALLOC(de, struct devfs_dirent *, i, M_DEVFS, M_WAITOK);
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bzero(de, i);
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de->de_dirent = (struct dirent *)(de + 1);
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de->de_dirent->d_namlen = namelen;
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de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d);
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bcopy(name, de->de_dirent->d_name, namelen + 1);
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nanotime(&de->de_ctime);
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de->de_mtime = de->de_atime = de->de_ctime;
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de->de_links = 1;
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return (de);
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}
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struct devfs_dirent *
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devfs_vmkdir(char *name, int namelen, struct devfs_dirent *dotdot)
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{
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struct devfs_dirent *dd;
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struct devfs_dirent *de;
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dd = devfs_newdirent(name, namelen);
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TAILQ_INIT(&dd->de_dlist);
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dd->de_dirent->d_type = DT_DIR;
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dd->de_mode = 0755;
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dd->de_links = 2;
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dd->de_dir = dd;
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de = devfs_newdirent(".", 1);
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de->de_dirent->d_type = DT_DIR;
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de->de_dir = dd;
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de->de_flags |= DE_DOT;
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TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
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de = devfs_newdirent("..", 2);
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de->de_dirent->d_type = DT_DIR;
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if (dotdot == NULL)
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de->de_dir = dd;
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else
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de->de_dir = dotdot;
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de->de_flags |= DE_DOTDOT;
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TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
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return (dd);
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}
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static void
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devfs_delete(struct devfs_dirent *dd, struct devfs_dirent *de)
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{
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if (de->de_symlink) {
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FREE(de->de_symlink, M_DEVFS);
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de->de_symlink = NULL;
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}
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if (de->de_vnode) {
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de->de_vnode->v_data = NULL;
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vdrop(de->de_vnode);
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}
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TAILQ_REMOVE(&dd->de_dlist, de, de_list);
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FREE(de, M_DEVFS);
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}
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void
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devfs_purge(struct devfs_dirent *dd)
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{
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struct devfs_dirent *de;
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for (;;) {
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de = TAILQ_FIRST(&dd->de_dlist);
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if (de == NULL)
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break;
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devfs_delete(dd, de);
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}
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FREE(dd, M_DEVFS);
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}
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int
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devfs_populate(struct devfs_mount *dm)
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{
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int i, j;
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dev_t dev, pdev;
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struct devfs_dirent *dd;
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struct devfs_dirent *de;
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char *q, *s;
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while (dm->dm_generation != devfs_generation) {
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dm->dm_generation = devfs_generation;
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for (i = 0; i < NDEVINO; i++) {
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dev = devfs_inot[i];
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de = dm->dm_dirent[i];
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if (dev == NULL && de == DE_DELETED) {
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dm->dm_dirent[i] = NULL;
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continue;
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}
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if (dev == NULL && de != NULL) {
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dd = de->de_dir;
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dm->dm_dirent[i] = NULL;
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TAILQ_REMOVE(&dd->de_dlist, de, de_list);
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if (de->de_vnode) {
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de->de_vnode->v_data = NULL;
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vdrop(de->de_vnode);
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}
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FREE(de, M_DEVFS);
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continue;
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}
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if (dev == NULL)
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continue;
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if (de != NULL)
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continue;
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dd = dm->dm_basedir;
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s = dev->si_name;
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for (;;) {
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for (q = s; *q != '/' && *q != '\0'; q++)
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continue;
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if (*q != '/')
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break;
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de = devfs_find(dd, s, q - s);
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if (de == NULL) {
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de = devfs_vmkdir(s, q - s, dd);
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de->de_inode = dm->dm_inode++;
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TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
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dd->de_links++;
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}
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s = q + 1;
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dd = de;
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}
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de = devfs_newdirent(s, q - s);
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if (dev->si_flags & SI_ALIAS) {
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de->de_inode = dm->dm_inode++;
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de->de_uid = 0;
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de->de_gid = 0;
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de->de_mode = 0666;
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de->de_dirent->d_type = DT_LNK;
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pdev = dev->si_drv1;
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j = strlen(pdev->si_name) + 1;
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MALLOC(de->de_symlink, char *, j, M_DEVFS, M_WAITOK);
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bcopy(pdev->si_name, de->de_symlink, j);
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} else {
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de->de_inode = i;
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de->de_uid = dev->si_uid;
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de->de_gid = dev->si_gid;
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de->de_mode = dev->si_mode;
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de->de_dirent->d_type = DT_CHR;
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}
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dm->dm_dirent[i] = de;
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de->de_dir = dd;
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TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
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#if 0
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printf("Add ino%d %s\n", i, dev->si_name);
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#endif
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}
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}
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return (0);
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}
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dev_t devfs_inot[NDEVINO];
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int devfs_nino = 3;
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unsigned devfs_generation;
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static void
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devfs_create(dev_t dev)
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{
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if (dev->si_inode == 0 && devfs_nino < NDEVINO)
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dev->si_inode = devfs_nino++;
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if (dev->si_inode == 0) {
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printf("NDEVINO too small\n");
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return;
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}
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devfs_inot[dev->si_inode] = dev;
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devfs_generation++;
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}
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static void
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devfs_remove(dev_t dev)
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{
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devfs_inot[dev->si_inode] = NULL;
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devfs_generation++;
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}
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devfs_create_t *devfs_create_hook = devfs_create;
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devfs_remove_t *devfs_remove_hook = devfs_remove;
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int
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devfs_stdclone(char *name, char **namep, char *stem, int *unit)
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{
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int u, i;
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if (bcmp(stem, name, strlen(stem)) != 0)
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return (0);
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i = strlen(stem);
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if (!isdigit(name[i]))
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return (0);
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u = 0;
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while (isdigit(name[i])) {
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u *= 10;
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u += name[i++] - '0';
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}
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*unit = u;
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if (namep)
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*namep = &name[i];
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if (name[i])
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return (2);
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return (1);
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}
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