0ae42a4095
destroy_dev() from d_close() cdev method would self-deadlock. devfs_close() bump device thread reference counter, and destroy_dev() sleeps, waiting for si_threadcount to reach zero for cdev without d_purge method. destroy_dev_sched() could be used instead from d_close(), to schedule execution of destroy_dev() in another context. The destroy_dev_sched_drain() function can be used to drain the scheduled calls to destroy_dev_sched(). Similarly, drain_dev_clone_events() drains the events clone to make sure no lingering devices are left after dev_clone event handler deregistered. make_dev_credf(MAKEDEV_REF) function should be used from dev_clone event handlers instead of make_dev()/make_dev_cred() to ensure that created device has reference counter bumped before cdev mutex is dropped inside make_dev(). Reviewed by: tegge (early versions), njl (programming interface) Debugging help and testing by: Peter Holm Approved by: re (kensmith)
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*-
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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 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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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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};
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struct cdev *devfs_alloc(void);
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void devfs_free(struct cdev *);
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void devfs_create(struct cdev *dev);
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void devfs_destroy(struct cdev *dev);
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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 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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