749 lines
18 KiB
C
749 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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 <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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SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"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 dev_t and return the
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* 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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#ifdef COMPAT_FREEBSD11
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uint32_t ud_compat;
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#endif
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struct cdev_priv *cdp;
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struct cdev *dev;
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#ifdef COMPAT_FREEBSD11
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if (req->newlen == sizeof(ud_compat)) {
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error = SYSCTL_IN(req, &ud_compat, sizeof(ud_compat));
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if (error == 0)
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ud = ud_compat == (uint32_t)NODEV ? NODEV : ud_compat;
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} else
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#endif
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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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dev = NULL;
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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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dev = &cdp->cdp_c;
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dev_refl(dev);
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break;
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}
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dev_unlock();
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if (dev == NULL)
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return (ENOENT);
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error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
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dev_rel(dev);
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, devname,
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CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY|CTLFLAG_MPSAFE,
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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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SYSCTL_NULL_INT_PTR, sizeof(struct cdev), "sizeof(struct cdev)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev_priv, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct cdev_priv), "sizeof(struct cdev_priv)");
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struct cdev *
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devfs_alloc(int flags)
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{
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struct cdev_priv *cdp;
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struct cdev *cdev;
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struct timespec ts;
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cdp = malloc(sizeof *cdp, M_CDEVP, M_ZERO |
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((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK));
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if (cdp == NULL)
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return (NULL);
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mtx_init(&cdp->cdp_threadlock, "devthrd", NULL, MTX_DEF);
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cdp->cdp_dirents = &cdp->cdp_dirent0;
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cdev = &cdp->cdp_c;
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LIST_INIT(&cdev->si_children);
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vfs_timestamp(&ts);
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cdev->si_atime = cdev->si_mtime = cdev->si_ctime = ts;
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return (cdev);
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}
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int
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devfs_dev_exists(const char *name)
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{
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struct cdev_priv *cdp;
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dev_lock_assert_locked();
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TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
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if ((cdp->cdp_flags & CDP_ACTIVE) == 0)
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continue;
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if (devfs_pathpath(cdp->cdp_c.si_name, name) != 0)
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return (1);
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if (devfs_pathpath(name, cdp->cdp_c.si_name) != 0)
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return (1);
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}
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if (devfs_dir_find(name) != 0)
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return (1);
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return (0);
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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 = cdev2priv(cdev);
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if (cdev->si_cred != NULL)
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crfree(cdev->si_cred);
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devfs_free_cdp_inode(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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mtx_destroy(&cdp->cdp_threadlock);
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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, int type)
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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 (type != 0 && type != de->de_dirent->d_type)
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continue;
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/*
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* The race with finding non-active name is not
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* completely closed by the check, but it is similar
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* to the devfs_allocv() in making it unlikely enough.
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*/
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if (de->de_dirent->d_type == DT_CHR &&
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(de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
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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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KASSERT(de == NULL || (de->de_flags & DE_DOOMED) == 0,
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("devfs_find: returning a doomed entry"));
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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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dirent_terminate(de->de_dirent);
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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_devfs_init(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_parent_dirent(struct devfs_dirent *de)
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{
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if (de->de_dirent->d_type != DT_DIR)
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return (de->de_dir);
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if (de->de_flags & (DE_DOT | DE_DOTDOT))
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return (NULL);
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de = TAILQ_FIRST(&de->de_dlist); /* "." */
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if (de == NULL)
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return (NULL);
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de = TAILQ_NEXT(de, de_list); /* ".." */
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if (de == NULL)
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return (NULL);
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return (de->de_dir);
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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,
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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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/*
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* "." and ".." are always the two first entries in the
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* de_dlist list.
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*
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* Create the "." entry in the new directory.
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*/
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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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sx_assert(&dmp->dm_lock, SX_XLOCKED);
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TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list);
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dotdot->de_links++;
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devfs_rules_apply(dmp, dd);
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}
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#ifdef MAC
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mac_devfs_create_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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struct vnode *vp;
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vp = de->de_vnode;
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mtx_lock(&devfs_de_interlock);
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if (vp != NULL && vp->v_data == de)
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vp->v_data = NULL;
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mtx_unlock(&devfs_de_interlock);
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free(de, M_DEVFS3);
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}
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/*
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* Removes a directory if it is empty. Also empty parent directories are
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* removed recursively.
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*/
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static void
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devfs_rmdir_empty(struct devfs_mount *dm, struct devfs_dirent *de)
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{
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struct devfs_dirent *dd, *de_dot, *de_dotdot;
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sx_assert(&dm->dm_lock, SX_XLOCKED);
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for (;;) {
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KASSERT(de->de_dirent->d_type == DT_DIR,
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("devfs_rmdir_empty: de is not a directory"));
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if ((de->de_flags & DE_DOOMED) != 0 || de == dm->dm_rootdir)
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return;
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de_dot = TAILQ_FIRST(&de->de_dlist);
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KASSERT(de_dot != NULL, ("devfs_rmdir_empty: . missing"));
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de_dotdot = TAILQ_NEXT(de_dot, de_list);
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KASSERT(de_dotdot != NULL, ("devfs_rmdir_empty: .. missing"));
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/* Return if the directory is not empty. */
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if (TAILQ_NEXT(de_dotdot, de_list) != NULL)
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return;
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dd = devfs_parent_dirent(de);
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KASSERT(dd != NULL, ("devfs_rmdir_empty: NULL dd"));
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TAILQ_REMOVE(&de->de_dlist, de_dot, de_list);
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TAILQ_REMOVE(&de->de_dlist, de_dotdot, de_list);
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TAILQ_REMOVE(&dd->de_dlist, de, de_list);
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DEVFS_DE_HOLD(dd);
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devfs_delete(dm, de, DEVFS_DEL_NORECURSE);
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devfs_delete(dm, de_dot, DEVFS_DEL_NORECURSE);
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devfs_delete(dm, de_dotdot, DEVFS_DEL_NORECURSE);
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if (DEVFS_DE_DROP(dd)) {
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devfs_dirent_free(dd);
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return;
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}
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de = dd;
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}
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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 flags)
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{
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struct devfs_dirent *dd;
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struct vnode *vp;
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KASSERT((de->de_flags & DE_DOOMED) == 0,
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("devfs_delete doomed dirent"));
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de->de_flags |= DE_DOOMED;
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if ((flags & DEVFS_DEL_NORECURSE) == 0) {
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dd = devfs_parent_dirent(de);
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if (dd != NULL)
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DEVFS_DE_HOLD(dd);
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if (de->de_flags & DE_USER) {
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KASSERT(dd != NULL, ("devfs_delete: NULL dd"));
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devfs_dir_unref_de(dm, dd);
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}
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} else
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dd = NULL;
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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 ((flags & DEVFS_DEL_VNLOCKED) == 0)
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vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
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else
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VI_UNLOCK(vp);
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vgone(vp);
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if ((flags & DEVFS_DEL_VNLOCKED) == 0)
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VOP_UNLOCK(vp);
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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_devfs_destroy(de);
|
|
#endif
|
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if (de->de_inode > DEVFS_ROOTINO) {
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devfs_free_cdp_inode(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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if (dd != NULL) {
|
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if (DEVFS_DE_DROP(dd))
|
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devfs_dirent_free(dd);
|
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else
|
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devfs_rmdir_empty(dm, dd);
|
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}
|
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}
|
|
|
|
/*
|
|
* Called on unmount.
|
|
* Recursively removes the entire tree.
|
|
* The caller needs to hold the dm for the duration of the call.
|
|
*/
|
|
|
|
static void
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devfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd)
|
|
{
|
|
struct devfs_dirent *de;
|
|
|
|
sx_assert(&dm->dm_lock, SX_XLOCKED);
|
|
|
|
DEVFS_DE_HOLD(dd);
|
|
for (;;) {
|
|
/*
|
|
* Use TAILQ_LAST() to remove "." and ".." last.
|
|
* We might need ".." to resolve a path in
|
|
* devfs_dir_unref_de().
|
|
*/
|
|
de = TAILQ_LAST(&dd->de_dlist, devfs_dlist_head);
|
|
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_USER)
|
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devfs_dir_unref_de(dm, dd);
|
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if (de->de_flags & (DE_DOT | DE_DOTDOT))
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|
devfs_delete(dm, de, DEVFS_DEL_NORECURSE);
|
|
else if (de->de_dirent->d_type == DT_DIR)
|
|
devfs_purge(dm, de);
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else
|
|
devfs_delete(dm, de, DEVFS_DEL_NORECURSE);
|
|
}
|
|
if (DEVFS_DE_DROP(dd))
|
|
devfs_dirent_free(dd);
|
|
else if ((dd->de_flags & DE_DOOMED) == 0)
|
|
devfs_delete(dm, dd, DEVFS_DEL_NORECURSE);
|
|
}
|
|
|
|
/*
|
|
* Each cdev_priv has an array of pointers to devfs_dirent which is indexed
|
|
* by the mount points dm_idx.
|
|
* This function extends the array when necessary, taking into account that
|
|
* the default array is 1 element and not malloc'ed.
|
|
*/
|
|
static void
|
|
devfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm)
|
|
{
|
|
struct devfs_dirent **dep;
|
|
int siz;
|
|
|
|
siz = (dm->dm_idx + 1) * sizeof *dep;
|
|
dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO);
|
|
dev_lock();
|
|
if (dm->dm_idx <= cdp->cdp_maxdirent) {
|
|
/* We got raced */
|
|
dev_unlock();
|
|
free(dep, M_DEVFS2);
|
|
return;
|
|
}
|
|
memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep);
|
|
if (cdp->cdp_maxdirent > 0)
|
|
free(cdp->cdp_dirents, M_DEVFS2);
|
|
cdp->cdp_dirents = dep;
|
|
/*
|
|
* XXX: if malloc told us how much we actually got this could
|
|
* XXX: be optimized.
|
|
*/
|
|
cdp->cdp_maxdirent = dm->dm_idx;
|
|
dev_unlock();
|
|
}
|
|
|
|
/*
|
|
* The caller needs to hold the dm for the duration of the call.
|
|
*/
|
|
static int
|
|
devfs_populate_loop(struct devfs_mount *dm, int cleanup)
|
|
{
|
|
struct cdev_priv *cdp;
|
|
struct devfs_dirent *de;
|
|
struct devfs_dirent *dd, *dt;
|
|
struct cdev *pdev;
|
|
int de_flags, depth, j;
|
|
char *q, *s;
|
|
|
|
sx_assert(&dm->dm_lock, SX_XLOCKED);
|
|
dev_lock();
|
|
TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
|
|
KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents"));
|
|
|
|
/*
|
|
* If we are unmounting, or the device has been destroyed,
|
|
* clean up our dirent.
|
|
*/
|
|
if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) &&
|
|
dm->dm_idx <= cdp->cdp_maxdirent &&
|
|
cdp->cdp_dirents[dm->dm_idx] != NULL) {
|
|
de = cdp->cdp_dirents[dm->dm_idx];
|
|
cdp->cdp_dirents[dm->dm_idx] = NULL;
|
|
KASSERT(cdp == de->de_cdp,
|
|
("%s %d %s %p %p", __func__, __LINE__,
|
|
cdp->cdp_c.si_name, cdp, de->de_cdp));
|
|
KASSERT(de->de_dir != NULL, ("Null de->de_dir"));
|
|
dev_unlock();
|
|
|
|
TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list);
|
|
de->de_cdp = NULL;
|
|
de->de_inode = 0;
|
|
devfs_delete(dm, de, 0);
|
|
dev_lock();
|
|
cdp->cdp_inuse--;
|
|
dev_unlock();
|
|
return (1);
|
|
}
|
|
/*
|
|
* GC any lingering devices
|
|
*/
|
|
if (!(cdp->cdp_flags & CDP_ACTIVE)) {
|
|
if (cdp->cdp_inuse > 0)
|
|
continue;
|
|
TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
|
|
dev_unlock();
|
|
dev_rel(&cdp->cdp_c);
|
|
return (1);
|
|
}
|
|
/*
|
|
* Don't create any new dirents if we are unmounting
|
|
*/
|
|
if (cleanup)
|
|
continue;
|
|
KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!"));
|
|
|
|
if (dm->dm_idx <= cdp->cdp_maxdirent &&
|
|
cdp->cdp_dirents[dm->dm_idx] != NULL) {
|
|
de = cdp->cdp_dirents[dm->dm_idx];
|
|
KASSERT(cdp == de->de_cdp, ("inconsistent cdp"));
|
|
continue;
|
|
}
|
|
|
|
cdp->cdp_inuse++;
|
|
dev_unlock();
|
|
|
|
if (dm->dm_idx > cdp->cdp_maxdirent)
|
|
devfs_metoo(cdp, dm);
|
|
|
|
dd = dm->dm_rootdir;
|
|
s = cdp->cdp_c.si_name;
|
|
for (;;) {
|
|
for (q = s; *q != '/' && *q != '\0'; q++)
|
|
continue;
|
|
if (*q != '/')
|
|
break;
|
|
de = devfs_find(dd, s, q - s, 0);
|
|
if (de == NULL)
|
|
de = devfs_vmkdir(dm, s, q - s, dd, 0);
|
|
else if (de->de_dirent->d_type == DT_LNK) {
|
|
de = devfs_find(dd, s, q - s, DT_DIR);
|
|
if (de == NULL)
|
|
de = devfs_vmkdir(dm, s, q - s, dd, 0);
|
|
de->de_flags |= DE_COVERED;
|
|
}
|
|
s = q + 1;
|
|
dd = de;
|
|
KASSERT(dd->de_dirent->d_type == DT_DIR &&
|
|
(dd->de_flags & (DE_DOT | DE_DOTDOT)) == 0,
|
|
("%s: invalid directory (si_name=%s)",
|
|
__func__, cdp->cdp_c.si_name));
|
|
}
|
|
de_flags = 0;
|
|
de = devfs_find(dd, s, q - s, DT_LNK);
|
|
if (de != NULL)
|
|
de_flags |= DE_COVERED;
|
|
|
|
de = devfs_newdirent(s, q - s);
|
|
if (cdp->cdp_c.si_flags & SI_ALIAS) {
|
|
de->de_uid = 0;
|
|
de->de_gid = 0;
|
|
de->de_mode = 0755;
|
|
de->de_dirent->d_type = DT_LNK;
|
|
pdev = cdp->cdp_c.si_parent;
|
|
dt = dd;
|
|
depth = 0;
|
|
while (dt != dm->dm_rootdir &&
|
|
(dt = devfs_parent_dirent(dt)) != NULL)
|
|
depth++;
|
|
j = depth * 3 + strlen(pdev->si_name) + 1;
|
|
de->de_symlink = malloc(j, M_DEVFS, M_WAITOK);
|
|
de->de_symlink[0] = 0;
|
|
while (depth-- > 0)
|
|
strcat(de->de_symlink, "../");
|
|
strcat(de->de_symlink, pdev->si_name);
|
|
} else {
|
|
de->de_uid = cdp->cdp_c.si_uid;
|
|
de->de_gid = cdp->cdp_c.si_gid;
|
|
de->de_mode = cdp->cdp_c.si_mode;
|
|
de->de_dirent->d_type = DT_CHR;
|
|
}
|
|
de->de_flags |= de_flags;
|
|
de->de_inode = cdp->cdp_inode;
|
|
de->de_cdp = cdp;
|
|
#ifdef MAC
|
|
mac_devfs_create_device(cdp->cdp_c.si_cred, dm->dm_mount,
|
|
&cdp->cdp_c, de);
|
|
#endif
|
|
de->de_dir = dd;
|
|
TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
|
|
devfs_rules_apply(dm, de);
|
|
dev_lock();
|
|
/* XXX: could check that cdp is still active here */
|
|
KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL,
|
|
("%s %d\n", __func__, __LINE__));
|
|
cdp->cdp_dirents[dm->dm_idx] = de;
|
|
KASSERT(de->de_cdp != (void *)0xdeadc0de,
|
|
("%s %d\n", __func__, __LINE__));
|
|
dev_unlock();
|
|
return (1);
|
|
}
|
|
dev_unlock();
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
devfs_populate_needed(struct devfs_mount *dm)
|
|
{
|
|
|
|
return (dm->dm_generation != devfs_generation);
|
|
}
|
|
|
|
/*
|
|
* The caller needs to hold the dm for the duration of the call.
|
|
*/
|
|
void
|
|
devfs_populate(struct devfs_mount *dm)
|
|
{
|
|
unsigned gen;
|
|
|
|
sx_assert(&dm->dm_lock, SX_XLOCKED);
|
|
if (!devfs_populate_needed(dm))
|
|
return;
|
|
gen = devfs_generation;
|
|
while (devfs_populate_loop(dm, 0))
|
|
continue;
|
|
dm->dm_generation = gen;
|
|
}
|
|
|
|
/*
|
|
* 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 necessary and no sleeping allowed.
|
|
*/
|
|
|
|
void
|
|
devfs_create(struct cdev *dev)
|
|
{
|
|
struct cdev_priv *cdp;
|
|
|
|
dev_lock_assert_locked();
|
|
cdp = cdev2priv(dev);
|
|
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;
|
|
|
|
dev_lock_assert_locked();
|
|
cdp = cdev2priv(dev);
|
|
cdp->cdp_flags &= ~CDP_ACTIVE;
|
|
devfs_generation++;
|
|
}
|
|
|
|
ino_t
|
|
devfs_alloc_cdp_inode(void)
|
|
{
|
|
|
|
return (alloc_unr(devfs_inos));
|
|
}
|
|
|
|
void
|
|
devfs_free_cdp_inode(ino_t ino)
|
|
{
|
|
|
|
if (ino > 0)
|
|
free_unr(devfs_inos, ino);
|
|
}
|
|
|
|
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);
|