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
35 #include <sys/zfs_znode.h>
44 znode_t *r_zp; /* znode this lock applies to */
45 avl_node_t r_node; /* avl node link */
46 uint64_t r_off; /* file range offset */
47 uint64_t r_len; /* file range length */
48 uint_t r_cnt; /* range reference count in tree */
49 rl_type_t r_type; /* range type */
50 kcondvar_t r_wr_cv; /* cv for waiting writers */
51 kcondvar_t r_rd_cv; /* cv for waiting readers */
52 uint8_t r_proxy; /* acting for original range */
53 uint8_t r_write_wanted; /* writer wants to lock this range */
54 uint8_t r_read_wanted; /* reader wants to lock this range */
58 * Lock a range (offset, length) as either shared (RL_READER)
59 * or exclusive (RL_WRITER or RL_APPEND). RL_APPEND is a special type that
60 * is converted to RL_WRITER that specified to lock from the start of the
61 * end of file. Returns the range lock structure.
63 rl_t *zfs_range_lock(znode_t *zp, uint64_t off, uint64_t len, rl_type_t type);
65 /* Unlock range and destroy range lock structure. */
66 void zfs_range_unlock(rl_t *rl);
69 * Reduce range locked as RW_WRITER from whole file to specified range.
70 * Asserts the whole file was previously locked.
72 void zfs_range_reduce(rl_t *rl, uint64_t off, uint64_t len);
75 * AVL comparison function used to order range locks
76 * Locks are ordered on the start offset of the range.
78 int zfs_range_compare(const void *arg1, const void *arg2);
86 #endif /* _SYS_FS_ZFS_RLOCK_H */