]>
git.proxmox.com Git - mirror_zfs.git/blob - module/zfs/include/sys/zfs_rlock.h
f302b663e22a500214a6d364183f95e6f27a6c16
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_FS_ZFS_RLOCK_H
27 #define _SYS_FS_ZFS_RLOCK_H
29 #pragma ident "%Z%%M% %I% %E% SMI"
37 #include <sys/zfs_znode.h>
46 znode_t
*r_zp
; /* znode this lock applies to */
47 avl_node_t r_node
; /* avl node link */
48 uint64_t r_off
; /* file range offset */
49 uint64_t r_len
; /* file range length */
50 uint_t r_cnt
; /* range reference count in tree */
51 rl_type_t r_type
; /* range type */
52 kcondvar_t r_wr_cv
; /* cv for waiting writers */
53 kcondvar_t r_rd_cv
; /* cv for waiting readers */
54 uint8_t r_proxy
; /* acting for original range */
55 uint8_t r_write_wanted
; /* writer wants to lock this range */
56 uint8_t r_read_wanted
; /* reader wants to lock this range */
60 * Lock a range (offset, length) as either shared (READER)
61 * or exclusive (WRITER or APPEND). APPEND is a special type that
62 * is converted to WRITER that specified to lock from the start of the
63 * end of file. zfs_range_lock() returns the range lock structure.
65 rl_t
*zfs_range_lock(znode_t
*zp
, uint64_t off
, uint64_t len
, rl_type_t type
);
68 * Unlock range and destroy range lock structure.
70 void zfs_range_unlock(rl_t
*rl
);
73 * Reduce range locked as RW_WRITER from whole file to specified range.
74 * Asserts the whole file was previously locked.
76 void zfs_range_reduce(rl_t
*rl
, uint64_t off
, uint64_t len
);
79 * AVL comparison function used to compare range locks
81 int zfs_range_compare(const void *arg1
, const void *arg2
);
89 #endif /* _SYS_FS_ZFS_RLOCK_H */