6283f55ea1
One of the neat tricks an autoconf style project is capable of is allow configurion/building in a directory other than the source directory. The major advantage to this is that you can build the project various different ways while making changes in a single source tree. For example, this project is designed to work on various different Linux distributions each of which work slightly differently. This means that changes need to verified on each of those supported distributions perferably before the change is committed to the public git repo. Using nfs and custom build directories makes this much easier. I now have a single source tree in nfs mounted on several different systems each running a supported distribution. When I make a change to the source base I suspect may break things I can concurrently build from the same source on all the systems each in their own subdirectory. wget -c http://github.com/downloads/behlendorf/zfs/zfs-x.y.z.tar.gz tar -xzf zfs-x.y.z.tar.gz cd zfs-x-y-z ------------------------- run concurrently ---------------------- <ubuntu system> <fedora system> <debian system> <rhel6 system> mkdir ubuntu mkdir fedora mkdir debian mkdir rhel6 cd ubuntu cd fedora cd debian cd rhel6 ../configure ../configure ../configure ../configure make make make make make check make check make check make check This change also moves many of the include headers from individual incude/sys directories under the modules directory in to a single top level include directory. This has the advantage of making the build rules cleaner and logically it makes a bit more sense.
77 lines
2.3 KiB
C
77 lines
2.3 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 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _DFETCH_H
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#define _DFETCH_H
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern uint64_t zfetch_array_rd_sz;
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struct dnode; /* so we can reference dnode */
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typedef enum zfetch_dirn {
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ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */
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ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */
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} zfetch_dirn_t;
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typedef struct zstream {
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uint64_t zst_offset; /* offset of starting block in range */
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uint64_t zst_len; /* length of range, in blocks */
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zfetch_dirn_t zst_direction; /* direction of prefetch */
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uint64_t zst_stride; /* length of stride, in blocks */
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uint64_t zst_ph_offset; /* prefetch offset, in blocks */
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uint64_t zst_cap; /* prefetch limit (cap), in blocks */
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kmutex_t zst_lock; /* protects stream */
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clock_t zst_last; /* lbolt of last prefetch */
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avl_node_t zst_node; /* embed avl node here */
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} zstream_t;
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typedef struct zfetch {
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krwlock_t zf_rwlock; /* protects zfetch structure */
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list_t zf_stream; /* AVL tree of zstream_t's */
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struct dnode *zf_dnode; /* dnode that owns this zfetch */
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uint32_t zf_stream_cnt; /* # of active streams */
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uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */
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} zfetch_t;
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void zfetch_init(void);
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void zfetch_fini(void);
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void dmu_zfetch_init(zfetch_t *, struct dnode *);
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void dmu_zfetch_rele(zfetch_t *);
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void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DFETCH_H */
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