a02cab334c
This allows bumping threadcount without taking the global devmtx lock. In particular this eliminates contention on said lock while using bhyve with multiple vms. Reviewed by: kib Tested by: markj MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D22548
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 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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* $FreeBSD$
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*/
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/*
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* This file documents a private interface and it SHALL only be used
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* by kern/kern_conf.c and fs/devfs/...
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*/
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#ifndef _FS_DEVFS_DEVFS_INT_H_
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#define _FS_DEVFS_DEVFS_INT_H_
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#include <sys/queue.h>
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#ifdef _KERNEL
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struct devfs_dirent;
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struct devfs_mount;
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struct cdev_privdata {
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struct file *cdpd_fp;
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void *cdpd_data;
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void (*cdpd_dtr)(void *);
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LIST_ENTRY(cdev_privdata) cdpd_list;
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};
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struct cdev_priv {
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struct cdev cdp_c;
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TAILQ_ENTRY(cdev_priv) cdp_list;
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u_int cdp_inode;
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u_int cdp_flags;
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#define CDP_ACTIVE (1 << 0)
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#define CDP_SCHED_DTR (1 << 1)
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#define CDP_UNREF_DTR (1 << 2)
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u_int cdp_inuse;
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u_int cdp_maxdirent;
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struct devfs_dirent **cdp_dirents;
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struct devfs_dirent *cdp_dirent0;
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TAILQ_ENTRY(cdev_priv) cdp_dtr_list;
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void (*cdp_dtr_cb)(void *);
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void *cdp_dtr_cb_arg;
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LIST_HEAD(, cdev_privdata) cdp_fdpriv;
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struct mtx cdp_threadlock;
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};
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#define cdev2priv(c) __containerof(c, struct cdev_priv, cdp_c)
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struct cdev *devfs_alloc(int);
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int devfs_dev_exists(const char *);
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void devfs_free(struct cdev *);
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void devfs_create(struct cdev *);
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void devfs_destroy(struct cdev *);
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void devfs_destroy_cdevpriv(struct cdev_privdata *);
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int devfs_dir_find(const char *);
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void devfs_dir_ref_de(struct devfs_mount *, struct devfs_dirent *);
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void devfs_dir_unref_de(struct devfs_mount *, struct devfs_dirent *);
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int devfs_pathpath(const char *, const char *);
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extern struct unrhdr *devfs_inos;
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extern struct mtx devmtx;
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extern struct mtx devfs_de_interlock;
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extern struct sx clone_drain_lock;
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extern struct mtx cdevpriv_mtx;
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extern TAILQ_HEAD(cdev_priv_list, cdev_priv) cdevp_list;
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#endif /* _KERNEL */
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#endif /* !_FS_DEVFS_DEVFS_INT_H_ */
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