62d2d15116
where similar data structures exist to support devfs and the MAC Framework, but are named differently. Obtained from: TrustedBSD Project Sponsored by: SPARTA, Inc.
542 lines
13 KiB
C
542 lines
13 KiB
C
/*-
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* Copyright (c) 2000,2004
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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 "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/dirent.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/kdb.h>
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#include <fs/devfs/devfs.h>
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#include <fs/devfs/devfs_int.h>
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#include <security/mac/mac_framework.h>
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/*
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* The one true (but secret) list of active devices in the system.
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* Locked by dev_lock()/devmtx
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*/
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struct cdev_priv_list cdevp_list = TAILQ_HEAD_INITIALIZER(cdevp_list);
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struct unrhdr *devfs_inos;
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static MALLOC_DEFINE(M_DEVFS2, "DEVFS2", "DEVFS data 2");
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static MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3");
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static MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage");
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static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem");
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static unsigned devfs_generation;
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SYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD,
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&devfs_generation, 0, "DEVFS generation number");
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unsigned devfs_rule_depth = 1;
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SYSCTL_UINT(_vfs_devfs, OID_AUTO, rule_depth, CTLFLAG_RW,
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&devfs_rule_depth, 0, "Max depth of ruleset include");
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/*
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* Helper sysctl for devname(3). We're given a struct cdev * and return
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* the name, if any, registered by the device driver.
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*/
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static int
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sysctl_devname(SYSCTL_HANDLER_ARGS)
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{
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int error;
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dev_t ud;
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struct cdev_priv *cdp;
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error = SYSCTL_IN(req, &ud, sizeof (ud));
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if (error)
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return (error);
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if (ud == NODEV)
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return(EINVAL);
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/*
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ud ^ devfs_random();
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*/
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dev_lock();
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TAILQ_FOREACH(cdp, &cdevp_list, cdp_list)
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if (cdp->cdp_inode == ud)
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break;
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dev_unlock();
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if (cdp == NULL)
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return(ENOENT);
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return(SYSCTL_OUT(req, cdp->cdp_c.si_name, strlen(cdp->cdp_c.si_name) + 1));
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
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NULL, 0, sysctl_devname, "", "devname(3) handler");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
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0, sizeof(struct cdev), "sizeof(struct cdev)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev_priv, CTLFLAG_RD,
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0, sizeof(struct cdev_priv), "sizeof(struct cdev_priv)");
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struct cdev *
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devfs_alloc(void)
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{
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struct cdev_priv *cdp;
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struct cdev *cdev;
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cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO | M_WAITOK);
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cdp->cdp_dirents = &cdp->cdp_dirent0;
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cdp->cdp_dirent0 = NULL;
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cdp->cdp_maxdirent = 0;
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cdev = &cdp->cdp_c;
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cdev->si_priv = cdp;
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cdev->si_name = cdev->__si_namebuf;
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LIST_INIT(&cdev->si_children);
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return (cdev);
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}
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void
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devfs_free(struct cdev *cdev)
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{
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struct cdev_priv *cdp;
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cdp = cdev->si_priv;
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if (cdev->si_cred != NULL)
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crfree(cdev->si_cred);
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if (cdp->cdp_inode > 0)
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free_unr(devfs_inos, cdp->cdp_inode);
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if (cdp->cdp_maxdirent > 0)
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free(cdp->cdp_dirents, M_DEVFS2);
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free(cdp, M_CDEVP);
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}
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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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de = malloc(i, M_DEVFS3, M_WAITOK | M_ZERO);
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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);
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de->de_dirent->d_name[namelen] = '\0';
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vfs_timestamp(&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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de->de_holdcnt = 1;
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#ifdef MAC
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mac_init_devfs(de);
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#endif
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return (de);
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}
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struct devfs_dirent *
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devfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode)
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{
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struct devfs_dirent *dd;
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struct devfs_dirent *de;
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/* Create the new directory */
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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 = 0555;
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dd->de_links = 2;
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dd->de_dir = dd;
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if (inode != 0)
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dd->de_inode = inode;
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else
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dd->de_inode = alloc_unr(devfs_inos);
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/* Create the "." entry in the new directory */
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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_flags |= DE_DOT;
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TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
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de->de_dir = dd;
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/* Create the ".." entry in the new directory */
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de = devfs_newdirent("..", 2);
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de->de_dirent->d_type = DT_DIR;
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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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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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TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list);
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dotdot->de_links++;
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}
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#ifdef MAC
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mac_create_devfs_directory(dmp->dm_mount, name, namelen, dd);
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#endif
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return (dd);
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}
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void
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devfs_dirent_free(struct devfs_dirent *de)
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{
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free(de, M_DEVFS3);
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}
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/*
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* The caller needs to hold the dm for the duration of the call since
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* dm->dm_lock may be temporary dropped.
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*/
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void
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devfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int vp_locked)
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{
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struct vnode *vp;
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struct thread *td;
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KASSERT((de->de_flags & DE_DOOMED) == 0,
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("devfs_delete doomed dirent"));
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td = curthread;
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de->de_flags |= DE_DOOMED;
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mtx_lock(&devfs_de_interlock);
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vp = de->de_vnode;
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if (vp != NULL) {
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VI_LOCK(vp);
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mtx_unlock(&devfs_de_interlock);
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vholdl(vp);
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sx_unlock(&dm->dm_lock);
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if (!vp_locked)
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vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, td);
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else
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VI_UNLOCK(vp);
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vgone(vp);
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if (!vp_locked)
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VOP_UNLOCK(vp, 0, td);
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vdrop(vp);
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sx_xlock(&dm->dm_lock);
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} else
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mtx_unlock(&devfs_de_interlock);
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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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#ifdef MAC
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mac_destroy_devfs(de);
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#endif
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if (de->de_inode > DEVFS_ROOTINO) {
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free_unr(devfs_inos, de->de_inode);
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de->de_inode = 0;
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}
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if (DEVFS_DE_DROP(de))
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devfs_dirent_free(de);
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}
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/*
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* Called on unmount.
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* Recursively removes the entire tree.
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* The caller needs to hold the dm for the duration of the call.
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*/
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static void
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devfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd)
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{
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struct devfs_dirent *de;
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sx_assert(&dm->dm_lock, SX_XLOCKED);
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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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TAILQ_REMOVE(&dd->de_dlist, de, de_list);
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if (de->de_flags & (DE_DOT|DE_DOTDOT))
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devfs_delete(dm, de, 0);
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else if (de->de_dirent->d_type == DT_DIR)
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devfs_purge(dm, de);
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else
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devfs_delete(dm, de, 0);
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}
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devfs_delete(dm, dd, 0);
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}
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/*
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* Each cdev_priv has an array of pointers to devfs_dirent which is indexed
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* by the mount points dm_idx.
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* This function extends the array when necessary, taking into account that
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* the default array is 1 element and not malloc'ed.
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*/
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static void
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devfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm)
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{
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struct devfs_dirent **dep;
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int siz;
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siz = (dm->dm_idx + 1) * sizeof *dep;
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dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO);
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dev_lock();
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if (dm->dm_idx <= cdp->cdp_maxdirent) {
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/* We got raced */
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dev_unlock();
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free(dep, M_DEVFS2);
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return;
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}
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memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep);
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if (cdp->cdp_maxdirent > 0)
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free(cdp->cdp_dirents, M_DEVFS2);
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cdp->cdp_dirents = dep;
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/*
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* XXX: if malloc told us how much we actually got this could
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* XXX: be optimized.
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*/
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cdp->cdp_maxdirent = dm->dm_idx;
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dev_unlock();
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}
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/*
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* The caller needs to hold the dm for the duration of the call.
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*/
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static int
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devfs_populate_loop(struct devfs_mount *dm, int cleanup)
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{
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struct cdev_priv *cdp;
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struct devfs_dirent *de;
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struct devfs_dirent *dd;
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struct cdev *pdev;
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int j;
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char *q, *s;
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sx_assert(&dm->dm_lock, SX_XLOCKED);
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dev_lock();
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TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
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KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents"));
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/*
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* If we are unmounting, or the device has been destroyed,
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* clean up our dirent.
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*/
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if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) &&
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dm->dm_idx <= cdp->cdp_maxdirent &&
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cdp->cdp_dirents[dm->dm_idx] != NULL) {
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de = cdp->cdp_dirents[dm->dm_idx];
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cdp->cdp_dirents[dm->dm_idx] = NULL;
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KASSERT(cdp == de->de_cdp,
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("%s %d %s %p %p", __func__, __LINE__,
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cdp->cdp_c.si_name, cdp, de->de_cdp));
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KASSERT(de->de_dir != NULL, ("Null de->de_dir"));
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dev_unlock();
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TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list);
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de->de_cdp = NULL;
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de->de_inode = 0;
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devfs_delete(dm, de, 0);
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dev_lock();
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cdp->cdp_inuse--;
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dev_unlock();
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return (1);
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}
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/*
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* GC any lingering devices
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*/
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if (!(cdp->cdp_flags & CDP_ACTIVE)) {
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if (cdp->cdp_inuse > 0)
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continue;
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TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
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dev_unlock();
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dev_rel(&cdp->cdp_c);
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return (1);
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}
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/*
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* Don't create any new dirents if we are unmounting
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*/
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if (cleanup)
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continue;
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KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!"));
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if (dm->dm_idx <= cdp->cdp_maxdirent &&
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cdp->cdp_dirents[dm->dm_idx] != NULL) {
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de = cdp->cdp_dirents[dm->dm_idx];
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KASSERT(cdp == de->de_cdp, ("inconsistent cdp"));
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continue;
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}
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cdp->cdp_inuse++;
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dev_unlock();
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if (dm->dm_idx > cdp->cdp_maxdirent)
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devfs_metoo(cdp, dm);
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dd = dm->dm_rootdir;
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s = cdp->cdp_c.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(dm, s, q - s, dd, 0);
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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 (cdp->cdp_c.si_flags & SI_ALIAS) {
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de->de_uid = 0;
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de->de_gid = 0;
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de->de_mode = 0755;
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de->de_dirent->d_type = DT_LNK;
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pdev = cdp->cdp_c.si_parent;
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j = strlen(pdev->si_name) + 1;
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de->de_symlink = malloc(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_uid = cdp->cdp_c.si_uid;
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de->de_gid = cdp->cdp_c.si_gid;
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de->de_mode = cdp->cdp_c.si_mode;
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de->de_dirent->d_type = DT_CHR;
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}
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de->de_inode = cdp->cdp_inode;
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de->de_cdp = cdp;
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#ifdef MAC
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mac_create_devfs_device(cdp->cdp_c.si_cred, dm->dm_mount,
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&cdp->cdp_c, de);
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#endif
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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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devfs_rules_apply(dm, de);
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dev_lock();
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/* XXX: could check that cdp is still active here */
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KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL,
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("%s %d\n", __func__, __LINE__));
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cdp->cdp_dirents[dm->dm_idx] = de;
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KASSERT(de->de_cdp != (void *)0xdeadc0de,
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("%s %d\n", __func__, __LINE__));
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dev_unlock();
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return (1);
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}
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dev_unlock();
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return (0);
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}
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/*
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* The caller needs to hold the dm for the duration of the call.
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*/
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void
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devfs_populate(struct devfs_mount *dm)
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{
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sx_assert(&dm->dm_lock, SX_XLOCKED);
|
|
if (dm->dm_generation == devfs_generation)
|
|
return;
|
|
while (devfs_populate_loop(dm, 0))
|
|
continue;
|
|
dm->dm_generation = devfs_generation;
|
|
}
|
|
|
|
/*
|
|
* The caller needs to hold the dm for the duration of the call.
|
|
*/
|
|
void
|
|
devfs_cleanup(struct devfs_mount *dm)
|
|
{
|
|
|
|
sx_assert(&dm->dm_lock, SX_XLOCKED);
|
|
while (devfs_populate_loop(dm, 1))
|
|
continue;
|
|
devfs_purge(dm, dm->dm_rootdir);
|
|
}
|
|
|
|
/*
|
|
* devfs_create() and devfs_destroy() are called from kern_conf.c and
|
|
* in both cases the devlock() mutex is held, so no further locking
|
|
* is necesary and no sleeping allowed.
|
|
*/
|
|
|
|
void
|
|
devfs_create(struct cdev *dev)
|
|
{
|
|
struct cdev_priv *cdp;
|
|
|
|
mtx_assert(&devmtx, MA_OWNED);
|
|
cdp = dev->si_priv;
|
|
cdp->cdp_flags |= CDP_ACTIVE;
|
|
cdp->cdp_inode = alloc_unrl(devfs_inos);
|
|
dev_refl(dev);
|
|
TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list);
|
|
devfs_generation++;
|
|
}
|
|
|
|
void
|
|
devfs_destroy(struct cdev *dev)
|
|
{
|
|
struct cdev_priv *cdp;
|
|
|
|
mtx_assert(&devmtx, MA_OWNED);
|
|
cdp = dev->si_priv;
|
|
cdp->cdp_flags &= ~CDP_ACTIVE;
|
|
devfs_generation++;
|
|
}
|
|
|
|
static void
|
|
devfs_devs_init(void *junk __unused)
|
|
{
|
|
|
|
devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx);
|
|
}
|
|
|
|
SYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL);
|