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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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21 /*
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22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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23 * Use is subject to license terms.
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24 */
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25
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26 #ifndef _SYS_ARC_H
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27 #define _SYS_ARC_H
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28
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29 #pragma ident "%Z%%M% %I% %E% SMI"
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30
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31 #include <sys/zfs_context.h>
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32
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33 #ifdef __cplusplus
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34 extern "C" {
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35 #endif
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36
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37 #include <sys/zio.h>
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38
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39 typedef struct arc_buf_hdr arc_buf_hdr_t;
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40 typedef struct arc_buf arc_buf_t;
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41 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
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42 typedef void arc_byteswap_func_t(void *buf, size_t size);
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43 typedef int arc_evict_func_t(void *private);
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44
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45 /* generic arc_done_func_t's which you can use */
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46 arc_done_func_t arc_bcopy_func;
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47 arc_done_func_t arc_getbuf_func;
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48
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49 struct arc_buf {
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50 arc_buf_hdr_t *b_hdr;
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51 arc_buf_t *b_next;
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52 void *b_data;
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53 arc_evict_func_t *b_efunc;
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54 void *b_private;
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55 };
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56
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57 /*
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58 * These are the flags we pass into calls to the arc
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59 */
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60 #define ARC_WAIT (1 << 1) /* perform I/O synchronously */
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61 #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */
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62 #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */
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63
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64 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag);
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65 void arc_buf_add_ref(arc_buf_t *buf, void *tag);
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66 int arc_buf_remove_ref(arc_buf_t *buf, void *tag);
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67 int arc_buf_size(arc_buf_t *buf);
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68 void arc_release(arc_buf_t *buf, void *tag);
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69 int arc_released(arc_buf_t *buf);
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70 int arc_has_callback(arc_buf_t *buf);
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71 #ifdef ZFS_DEBUG
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72 int arc_referenced(arc_buf_t *buf);
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73 #endif
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74
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75 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap,
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76 arc_done_func_t *done, void *private, int priority, int flags,
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77 uint32_t arc_flags, zbookmark_t *zb);
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78 int arc_write(zio_t *pio, spa_t *spa, int checksum, int compress,
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79 uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
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80 arc_done_func_t *done, void *private, int priority, int flags,
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81 uint32_t arc_flags, zbookmark_t *zb);
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82 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
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83 zio_done_func_t *done, void *private, uint32_t arc_flags);
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84 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data);
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85
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86 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
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87 int arc_buf_evict(arc_buf_t *buf);
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88
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89 void arc_flush(void);
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90 void arc_tempreserve_clear(uint64_t tempreserve);
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91 int arc_tempreserve_space(uint64_t tempreserve);
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92
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93 void arc_init(void);
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94 void arc_fini(void);
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95
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96 #ifdef __cplusplus
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97 }
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98 #endif
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99
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100 #endif /* _SYS_ARC_H */
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