mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-27 03:19:35 +03:00
5cb65efe2c
The DMU zfetch code organizes streams with lists not avl trees. A avl_node_t was mistakenly used for a list_node_t in the zstream_t type. This is incorrect (but harmless) and when unnoticed because: 1) The list functions explicitly cast the value preventing a warning, 2) sizeof(avl_node_t) >= sizeof(list_node_t) so no overrun occurs, and 3) The calculated offset is the same regardless of the type. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1946
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
/*
|
|
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
|
|
#ifndef _DFETCH_H
|
|
#define _DFETCH_H
|
|
|
|
#include <sys/zfs_context.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
extern unsigned long zfetch_array_rd_sz;
|
|
|
|
struct dnode; /* so we can reference dnode */
|
|
|
|
typedef enum zfetch_dirn {
|
|
ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */
|
|
ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */
|
|
} zfetch_dirn_t;
|
|
|
|
typedef struct zstream {
|
|
uint64_t zst_offset; /* offset of starting block in range */
|
|
uint64_t zst_len; /* length of range, in blocks */
|
|
zfetch_dirn_t zst_direction; /* direction of prefetch */
|
|
uint64_t zst_stride; /* length of stride, in blocks */
|
|
uint64_t zst_ph_offset; /* prefetch offset, in blocks */
|
|
uint64_t zst_cap; /* prefetch limit (cap), in blocks */
|
|
kmutex_t zst_lock; /* protects stream */
|
|
clock_t zst_last; /* lbolt of last prefetch */
|
|
list_node_t zst_node; /* next zstream here */
|
|
} zstream_t;
|
|
|
|
typedef struct zfetch {
|
|
krwlock_t zf_rwlock; /* protects zfetch structure */
|
|
list_t zf_stream; /* AVL tree of zstream_t's */
|
|
struct dnode *zf_dnode; /* dnode that owns this zfetch */
|
|
uint32_t zf_stream_cnt; /* # of active streams */
|
|
uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */
|
|
} zfetch_t;
|
|
|
|
void zfetch_init(void);
|
|
void zfetch_fini(void);
|
|
|
|
void dmu_zfetch_init(zfetch_t *, struct dnode *);
|
|
void dmu_zfetch_rele(zfetch_t *);
|
|
void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _DFETCH_H */
|