zfs/lib/libzpool/include/sys/arc.h

   1 /*
   2  * CDDL HEADER START
   3  *
   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.
   7  *
   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.
  12  *
  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]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_ARC_H
  27 #define _SYS_ARC_H
  28
  29 #include <sys/zfs_context.h>
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 #include <sys/zio.h>
  36 #include <sys/dmu.h>
  37 #include <sys/spa.h>
  38
  39 typedef struct arc_buf_hdr arc_buf_hdr_t;
  40 typedef struct arc_buf arc_buf_t;
  41 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
  42 typedef int arc_evict_func_t(void *private);
  43
  44 /* generic arc_done_func_t's which you can use */
  45 arc_done_func_t arc_bcopy_func;
  46 arc_done_func_t arc_getbuf_func;
  47
  48 struct arc_buf {
  49         arc_buf_hdr_t           *b_hdr;
  50         arc_buf_t               *b_next;
  51         krwlock_t               b_lock;
  52         void                    *b_data;
  53         arc_evict_func_t        *b_efunc;
  54         void                    *b_private;
  55 };
  56
  57 typedef enum arc_buf_contents {
  58         ARC_BUFC_DATA,                          /* buffer contains data */
  59         ARC_BUFC_METADATA,                      /* buffer contains metadata */
  60         ARC_BUFC_NUMTYPES
  61 } arc_buf_contents_t;
  62 /*
  63  * These are the flags we pass into calls to the arc
  64  */
  65 #define ARC_WAIT        (1 << 1)        /* perform I/O synchronously */
  66 #define ARC_NOWAIT      (1 << 2)        /* perform I/O asynchronously */
  67 #define ARC_PREFETCH    (1 << 3)        /* I/O is a prefetch */
  68 #define ARC_CACHED      (1 << 4)        /* I/O was already in cache */
  69 #define ARC_L2CACHE     (1 << 5)        /* cache in L2ARC */
  70
  71 void arc_space_consume(uint64_t space);
  72 void arc_space_return(uint64_t space);
  73 void *arc_data_buf_alloc(uint64_t space);
  74 void arc_data_buf_free(void *buf, uint64_t space);
  75 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
  76     arc_buf_contents_t type);
  77 void arc_buf_add_ref(arc_buf_t *buf, void *tag);
  78 int arc_buf_remove_ref(arc_buf_t *buf, void *tag);
  79 int arc_buf_size(arc_buf_t *buf);
  80 void arc_release(arc_buf_t *buf, void *tag);
  81 int arc_released(arc_buf_t *buf);
  82 int arc_has_callback(arc_buf_t *buf);
  83 void arc_buf_freeze(arc_buf_t *buf);
  84 void arc_buf_thaw(arc_buf_t *buf);
  85 #ifdef ZFS_DEBUG
  86 int arc_referenced(arc_buf_t *buf);
  87 #endif
  88
  89 typedef struct writeprops {
  90         dmu_object_type_t wp_type;
  91         uint8_t wp_level;
  92         uint8_t wp_copies;
  93         uint8_t wp_dncompress, wp_oscompress;
  94         uint8_t wp_dnchecksum, wp_oschecksum;
  95 } writeprops_t;
  96
  97 void write_policy(spa_t *spa, const writeprops_t *wp, zio_prop_t *zp);
  98 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_buf_t *pbuf,
  99     arc_done_func_t *done, void *private, int priority, int zio_flags,
 100     uint32_t *arc_flags, const zbookmark_t *zb);
 101 int arc_read_nolock(zio_t *pio, spa_t *spa, blkptr_t *bp,
 102     arc_done_func_t *done, void *private, int priority, int flags,
 103     uint32_t *arc_flags, const zbookmark_t *zb);
 104 zio_t *arc_write(zio_t *pio, spa_t *spa, const writeprops_t *wp,
 105     boolean_t l2arc, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
 106     arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority,
 107     int zio_flags, const zbookmark_t *zb);
 108 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 109     zio_done_func_t *done, void *private, uint32_t arc_flags);
 110 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data);
 111
 112 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
 113 int arc_buf_evict(arc_buf_t *buf);
 114
 115 void arc_flush(spa_t *spa);
 116 void arc_tempreserve_clear(uint64_t reserve);
 117 int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
 118
 119 void arc_init(void);
 120 void arc_fini(void);
 121
 122 /*
 123  * Level 2 ARC
 124  */
 125
 126 void l2arc_add_vdev(spa_t *spa, vdev_t *vd, uint64_t start, uint64_t end);
 127 void l2arc_remove_vdev(vdev_t *vd);
 128 boolean_t l2arc_vdev_present(vdev_t *vd);
 129 void l2arc_init(void);
 130 void l2arc_fini(void);
 131 void l2arc_start(void);
 132 void l2arc_stop(void);
 133
 134 #ifdef  __cplusplus
 135 }
 136 #endif
 137
 138 #endif /* _SYS_ARC_H */