319 lines
10 KiB
C
319 lines
10 KiB
C
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/*
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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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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*/
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#ifndef _SYS_ARC_H
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#define _SYS_ARC_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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#include <sys/zio.h>
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#include <sys/dmu.h>
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#include <sys/spa.h>
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#include <sys/refcount.h>
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/*
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* Used by arc_flush() to inform arc_evict_state() that it should evict
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* all available buffers from the arc state being passed in.
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*/
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#define ARC_EVICT_ALL -1ULL
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#define HDR_SET_LSIZE(hdr, x) do { \
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ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \
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(hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \
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_NOTE(CONSTCOND) } while (0)
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#define HDR_SET_PSIZE(hdr, x) do { \
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ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \
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(hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \
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_NOTE(CONSTCOND) } while (0)
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#define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT)
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#define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT)
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typedef struct arc_buf_hdr arc_buf_hdr_t;
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typedef struct arc_buf arc_buf_t;
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typedef struct arc_prune arc_prune_t;
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/*
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* Because the ARC can store encrypted data, errors (not due to bugs) may arise
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* while transforming data into its desired format - specifically, when
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* decrypting, the key may not be present, or the HMAC may not be correct
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* which signifies deliberate tampering with the on-disk state
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* (assuming that the checksum was correct). If any error occurs, the "buf"
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* parameter will be NULL.
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*/
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typedef void arc_read_done_func_t(zio_t *zio, const zbookmark_phys_t *zb,
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const blkptr_t *bp, arc_buf_t *buf, void *private);
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typedef void arc_write_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
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typedef void arc_prune_func_t(int64_t bytes, void *private);
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/* Shared module parameters */
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extern int zfs_arc_average_blocksize;
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/* generic arc_done_func_t's which you can use */
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arc_read_done_func_t arc_bcopy_func;
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arc_read_done_func_t arc_getbuf_func;
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/* generic arc_prune_func_t wrapper for callbacks */
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struct arc_prune {
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arc_prune_func_t *p_pfunc;
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void *p_private;
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uint64_t p_adjust;
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list_node_t p_node;
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zfs_refcount_t p_refcnt;
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};
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typedef enum arc_strategy {
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ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */
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ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */
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} arc_strategy_t;
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typedef enum arc_flags
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{
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/*
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* Public flags that can be passed into the ARC by external consumers.
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*/
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ARC_FLAG_WAIT = 1 << 0, /* perform sync I/O */
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ARC_FLAG_NOWAIT = 1 << 1, /* perform async I/O */
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ARC_FLAG_PREFETCH = 1 << 2, /* I/O is a prefetch */
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ARC_FLAG_CACHED = 1 << 3, /* I/O was in cache */
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ARC_FLAG_L2CACHE = 1 << 4, /* cache in L2ARC */
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ARC_FLAG_PREDICTIVE_PREFETCH = 1 << 5, /* I/O from zfetch */
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ARC_FLAG_PRESCIENT_PREFETCH = 1 << 6, /* long min lifespan */
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/*
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* Private ARC flags. These flags are private ARC only flags that
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* will show up in b_flags in the arc_hdr_buf_t. These flags should
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* only be set by ARC code.
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*/
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ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */
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ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */
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ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */
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ARC_FLAG_INDIRECT = 1 << 10, /* indirect block */
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/* Indicates that block was read with ASYNC priority. */
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ARC_FLAG_PRIO_ASYNC_READ = 1 << 11,
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ARC_FLAG_L2_WRITING = 1 << 12, /* write in progress */
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ARC_FLAG_L2_EVICTED = 1 << 13, /* evicted during I/O */
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ARC_FLAG_L2_WRITE_HEAD = 1 << 14, /* head of write list */
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/*
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* Encrypted or authenticated on disk (may be plaintext in memory).
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* This header has b_crypt_hdr allocated. Does not include indirect
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* blocks with checksums of MACs which will also have their X
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* (encrypted) bit set in the bp.
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*/
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ARC_FLAG_PROTECTED = 1 << 15,
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/* data has not been authenticated yet */
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ARC_FLAG_NOAUTH = 1 << 16,
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/* indicates that the buffer contains metadata (otherwise, data) */
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ARC_FLAG_BUFC_METADATA = 1 << 17,
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/* Flags specifying whether optional hdr struct fields are defined */
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ARC_FLAG_HAS_L1HDR = 1 << 18,
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ARC_FLAG_HAS_L2HDR = 1 << 19,
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/*
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* Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data.
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* This allows the l2arc to use the blkptr's checksum to verify
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* the data without having to store the checksum in the hdr.
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*/
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ARC_FLAG_COMPRESSED_ARC = 1 << 20,
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ARC_FLAG_SHARED_DATA = 1 << 21,
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/*
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* The arc buffer's compression mode is stored in the top 7 bits of the
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* flags field, so these dummy flags are included so that MDB can
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* interpret the enum properly.
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*/
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ARC_FLAG_COMPRESS_0 = 1 << 24,
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ARC_FLAG_COMPRESS_1 = 1 << 25,
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ARC_FLAG_COMPRESS_2 = 1 << 26,
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ARC_FLAG_COMPRESS_3 = 1 << 27,
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ARC_FLAG_COMPRESS_4 = 1 << 28,
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ARC_FLAG_COMPRESS_5 = 1 << 29,
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ARC_FLAG_COMPRESS_6 = 1 << 30
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} arc_flags_t;
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typedef enum arc_buf_flags {
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ARC_BUF_FLAG_SHARED = 1 << 0,
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ARC_BUF_FLAG_COMPRESSED = 1 << 1,
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/*
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* indicates whether this arc_buf_t is encrypted, regardless of
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* state on-disk
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*/
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ARC_BUF_FLAG_ENCRYPTED = 1 << 2
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} arc_buf_flags_t;
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struct arc_buf {
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arc_buf_hdr_t *b_hdr;
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arc_buf_t *b_next;
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kmutex_t b_evict_lock;
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void *b_data;
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arc_buf_flags_t b_flags;
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};
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typedef enum arc_buf_contents {
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ARC_BUFC_INVALID, /* invalid type */
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ARC_BUFC_DATA, /* buffer contains data */
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ARC_BUFC_METADATA, /* buffer contains metadata */
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ARC_BUFC_NUMTYPES
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} arc_buf_contents_t;
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/*
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* The following breakdowns of arc_size exist for kstat only.
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*/
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typedef enum arc_space_type {
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ARC_SPACE_DATA,
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ARC_SPACE_META,
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ARC_SPACE_HDRS,
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ARC_SPACE_L2HDRS,
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ARC_SPACE_DBUF,
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ARC_SPACE_DNODE,
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ARC_SPACE_BONUS,
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ARC_SPACE_NUMTYPES
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} arc_space_type_t;
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typedef enum arc_state_type {
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ARC_STATE_ANON,
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ARC_STATE_MRU,
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ARC_STATE_MRU_GHOST,
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ARC_STATE_MFU,
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ARC_STATE_MFU_GHOST,
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ARC_STATE_L2C_ONLY,
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ARC_STATE_NUMTYPES
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} arc_state_type_t;
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typedef struct arc_buf_info {
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arc_state_type_t abi_state_type;
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arc_buf_contents_t abi_state_contents;
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uint32_t abi_flags;
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uint32_t abi_bufcnt;
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uint64_t abi_size;
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uint64_t abi_spa;
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uint64_t abi_access;
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uint32_t abi_mru_hits;
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uint32_t abi_mru_ghost_hits;
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uint32_t abi_mfu_hits;
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uint32_t abi_mfu_ghost_hits;
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uint32_t abi_l2arc_hits;
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uint32_t abi_holds;
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uint64_t abi_l2arc_dattr;
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uint64_t abi_l2arc_asize;
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enum zio_compress abi_l2arc_compress;
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} arc_buf_info_t;
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void arc_space_consume(uint64_t space, arc_space_type_t type);
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void arc_space_return(uint64_t space, arc_space_type_t type);
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boolean_t arc_is_metadata(arc_buf_t *buf);
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boolean_t arc_is_encrypted(arc_buf_t *buf);
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boolean_t arc_is_unauthenticated(arc_buf_t *buf);
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enum zio_compress arc_get_compression(arc_buf_t *buf);
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void arc_get_raw_params(arc_buf_t *buf, boolean_t *byteorder, uint8_t *salt,
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uint8_t *iv, uint8_t *mac);
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int arc_untransform(arc_buf_t *buf, spa_t *spa, const zbookmark_phys_t *zb,
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boolean_t in_place);
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void arc_convert_to_raw(arc_buf_t *buf, uint64_t dsobj, boolean_t byteorder,
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dmu_object_type_t ot, const uint8_t *salt, const uint8_t *iv,
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const uint8_t *mac);
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arc_buf_t *arc_alloc_buf(spa_t *spa, void *tag, arc_buf_contents_t type,
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int32_t size);
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arc_buf_t *arc_alloc_compressed_buf(spa_t *spa, void *tag,
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uint64_t psize, uint64_t lsize, enum zio_compress compression_type);
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arc_buf_t *arc_alloc_raw_buf(spa_t *spa, void *tag, uint64_t dsobj,
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boolean_t byteorder, const uint8_t *salt, const uint8_t *iv,
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const uint8_t *mac, dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
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enum zio_compress compression_type);
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arc_buf_t *arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size);
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arc_buf_t *arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize,
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enum zio_compress compression_type);
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arc_buf_t *arc_loan_raw_buf(spa_t *spa, uint64_t dsobj, boolean_t byteorder,
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const uint8_t *salt, const uint8_t *iv, const uint8_t *mac,
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dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
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enum zio_compress compression_type);
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void arc_return_buf(arc_buf_t *buf, void *tag);
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void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
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void arc_buf_destroy(arc_buf_t *buf, void *tag);
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void arc_buf_info(arc_buf_t *buf, arc_buf_info_t *abi, int state_index);
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uint64_t arc_buf_size(arc_buf_t *buf);
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uint64_t arc_buf_lsize(arc_buf_t *buf);
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void arc_buf_access(arc_buf_t *buf);
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void arc_release(arc_buf_t *buf, void *tag);
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int arc_released(arc_buf_t *buf);
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void arc_buf_sigsegv(int sig, siginfo_t *si, void *unused);
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void arc_buf_freeze(arc_buf_t *buf);
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void arc_buf_thaw(arc_buf_t *buf);
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#ifdef ZFS_DEBUG
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int arc_referenced(arc_buf_t *buf);
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#endif
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int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
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arc_read_done_func_t *done, void *private, zio_priority_t priority,
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int flags, arc_flags_t *arc_flags, const zbookmark_phys_t *zb);
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zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
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blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp,
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arc_write_done_func_t *ready, arc_write_done_func_t *child_ready,
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arc_write_done_func_t *physdone, arc_write_done_func_t *done,
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void *private, zio_priority_t priority, int zio_flags,
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const zbookmark_phys_t *zb);
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arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *private);
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void arc_remove_prune_callback(arc_prune_t *p);
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void arc_freed(spa_t *spa, const blkptr_t *bp);
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void arc_flush(spa_t *spa, boolean_t retry);
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void arc_tempreserve_clear(uint64_t reserve);
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int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);
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uint64_t arc_target_bytes(void);
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void arc_init(void);
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void arc_fini(void);
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/*
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* Level 2 ARC
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*/
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void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
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void l2arc_remove_vdev(vdev_t *vd);
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boolean_t l2arc_vdev_present(vdev_t *vd);
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void l2arc_init(void);
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void l2arc_fini(void);
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void l2arc_start(void);
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void l2arc_stop(void);
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#ifndef _KERNEL
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extern boolean_t arc_watch;
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_ARC_H */
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