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6e00561712
zfs_rangelock_tryenter() bails immediately instead of waiting for the lock to become available. This will be used to resolve a deadlock in the FreeBSD page-in code. No functional change intended. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Signed-off-by: Mark Johnston <markj@FreeBSD.org> Closes #10519
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2018 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_FS_ZFS_RLOCK_H
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#define _SYS_FS_ZFS_RLOCK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/avl.h>
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typedef enum {
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RL_READER,
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RL_WRITER,
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RL_APPEND
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} zfs_rangelock_type_t;
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struct zfs_locked_range;
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typedef void (zfs_rangelock_cb_t)(struct zfs_locked_range *, void *);
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typedef struct zfs_rangelock {
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avl_tree_t rl_tree; /* contains locked_range_t */
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kmutex_t rl_lock;
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zfs_rangelock_cb_t *rl_cb;
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void *rl_arg;
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} zfs_rangelock_t;
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typedef struct zfs_locked_range {
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zfs_rangelock_t *lr_rangelock; /* rangelock that this lock applies to */
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avl_node_t lr_node; /* avl node link */
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uint64_t lr_offset; /* file range offset */
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uint64_t lr_length; /* file range length */
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uint_t lr_count; /* range reference count in tree */
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zfs_rangelock_type_t lr_type; /* range type */
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kcondvar_t lr_write_cv; /* cv for waiting writers */
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kcondvar_t lr_read_cv; /* cv for waiting readers */
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uint8_t lr_proxy; /* acting for original range */
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uint8_t lr_write_wanted; /* writer wants to lock this range */
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uint8_t lr_read_wanted; /* reader wants to lock this range */
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} zfs_locked_range_t;
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void zfs_rangelock_init(zfs_rangelock_t *, zfs_rangelock_cb_t *, void *);
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void zfs_rangelock_fini(zfs_rangelock_t *);
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zfs_locked_range_t *zfs_rangelock_enter(zfs_rangelock_t *,
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uint64_t, uint64_t, zfs_rangelock_type_t);
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zfs_locked_range_t *zfs_rangelock_tryenter(zfs_rangelock_t *,
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uint64_t, uint64_t, zfs_rangelock_type_t);
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void zfs_rangelock_exit(zfs_locked_range_t *);
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void zfs_rangelock_reduce(zfs_locked_range_t *, uint64_t, uint64_t);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_FS_ZFS_RLOCK_H */
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