diff options
Diffstat (limited to 'sys/contrib/openzfs/include/sys/arc.h')
| -rw-r--r-- | sys/contrib/openzfs/include/sys/arc.h | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/include/sys/arc.h b/sys/contrib/openzfs/include/sys/arc.h new file mode 100644 index 000000000000..a0852b4d5a70 --- /dev/null +++ b/sys/contrib/openzfs/include/sys/arc.h @@ -0,0 +1,335 @@ +/* + * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2012, 2016 by Delphix. All rights reserved. + * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. + * Copyright (c) 2019, Allan Jude + * Copyright (c) 2019, Klara Inc. + */ + +#ifndef _SYS_ARC_H +#define _SYS_ARC_H + +#include <sys/zfs_context.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#include <sys/zio.h> +#include <sys/dmu.h> +#include <sys/spa.h> +#include <sys/zfs_refcount.h> + +/* + * Used by arc_flush() to inform arc_evict_state() that it should evict + * all available buffers from the arc state being passed in. + */ +#define ARC_EVICT_ALL -1ULL + +#define HDR_SET_LSIZE(hdr, x) do { \ + ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \ + (hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \ +_NOTE(CONSTCOND) } while (0) + +#define HDR_SET_PSIZE(hdr, x) do { \ + ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \ + (hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \ +_NOTE(CONSTCOND) } while (0) + +#define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT) +#define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT) + +typedef struct arc_buf_hdr arc_buf_hdr_t; +typedef struct arc_buf arc_buf_t; +typedef struct arc_prune arc_prune_t; + +/* + * Because the ARC can store encrypted data, errors (not due to bugs) may arise + * while transforming data into its desired format - specifically, when + * decrypting, the key may not be present, or the HMAC may not be correct + * which signifies deliberate tampering with the on-disk state + * (assuming that the checksum was correct). If any error occurs, the "buf" + * parameter will be NULL. + */ +typedef void arc_read_done_func_t(zio_t *zio, const zbookmark_phys_t *zb, + const blkptr_t *bp, arc_buf_t *buf, void *priv); +typedef void arc_write_done_func_t(zio_t *zio, arc_buf_t *buf, void *priv); +typedef void arc_prune_func_t(int64_t bytes, void *priv); + +/* Shared module parameters */ +extern int zfs_arc_average_blocksize; + +/* generic arc_done_func_t's which you can use */ +arc_read_done_func_t arc_bcopy_func; +arc_read_done_func_t arc_getbuf_func; + +/* generic arc_prune_func_t wrapper for callbacks */ +struct arc_prune { + arc_prune_func_t *p_pfunc; + void *p_private; + uint64_t p_adjust; + list_node_t p_node; + zfs_refcount_t p_refcnt; +}; + +typedef enum arc_strategy { + ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */ + ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */ +} arc_strategy_t; + +typedef enum arc_flags +{ + /* + * Public flags that can be passed into the ARC by external consumers. + */ + ARC_FLAG_WAIT = 1 << 0, /* perform sync I/O */ + ARC_FLAG_NOWAIT = 1 << 1, /* perform async I/O */ + ARC_FLAG_PREFETCH = 1 << 2, /* I/O is a prefetch */ + ARC_FLAG_CACHED = 1 << 3, /* I/O was in cache */ + ARC_FLAG_L2CACHE = 1 << 4, /* cache in L2ARC */ + ARC_FLAG_PREDICTIVE_PREFETCH = 1 << 5, /* I/O from zfetch */ + ARC_FLAG_PRESCIENT_PREFETCH = 1 << 6, /* long min lifespan */ + + /* + * Private ARC flags. These flags are private ARC only flags that + * will show up in b_flags in the arc_hdr_buf_t. These flags should + * only be set by ARC code. + */ + ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */ + ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */ + ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */ + ARC_FLAG_INDIRECT = 1 << 10, /* indirect block */ + /* Indicates that block was read with ASYNC priority. */ + ARC_FLAG_PRIO_ASYNC_READ = 1 << 11, + ARC_FLAG_L2_WRITING = 1 << 12, /* write in progress */ + ARC_FLAG_L2_EVICTED = 1 << 13, /* evicted during I/O */ + ARC_FLAG_L2_WRITE_HEAD = 1 << 14, /* head of write list */ + /* + * Encrypted or authenticated on disk (may be plaintext in memory). + * This header has b_crypt_hdr allocated. Does not include indirect + * blocks with checksums of MACs which will also have their X + * (encrypted) bit set in the bp. + */ + ARC_FLAG_PROTECTED = 1 << 15, + /* data has not been authenticated yet */ + ARC_FLAG_NOAUTH = 1 << 16, + /* indicates that the buffer contains metadata (otherwise, data) */ + ARC_FLAG_BUFC_METADATA = 1 << 17, + + /* Flags specifying whether optional hdr struct fields are defined */ + ARC_FLAG_HAS_L1HDR = 1 << 18, + ARC_FLAG_HAS_L2HDR = 1 << 19, + + /* + * Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data. + * This allows the l2arc to use the blkptr's checksum to verify + * the data without having to store the checksum in the hdr. + */ + ARC_FLAG_COMPRESSED_ARC = 1 << 20, + ARC_FLAG_SHARED_DATA = 1 << 21, + + /* + * Fail this arc_read() (with ENOENT) if the data is not already present + * in cache. + */ + ARC_FLAG_CACHED_ONLY = 1 << 22, + + /* + * The arc buffer's compression mode is stored in the top 7 bits of the + * flags field, so these dummy flags are included so that MDB can + * interpret the enum properly. + */ + ARC_FLAG_COMPRESS_0 = 1 << 24, + ARC_FLAG_COMPRESS_1 = 1 << 25, + ARC_FLAG_COMPRESS_2 = 1 << 26, + ARC_FLAG_COMPRESS_3 = 1 << 27, + ARC_FLAG_COMPRESS_4 = 1 << 28, + ARC_FLAG_COMPRESS_5 = 1 << 29, + ARC_FLAG_COMPRESS_6 = 1 << 30 + +} arc_flags_t; + +typedef enum arc_buf_flags { + ARC_BUF_FLAG_SHARED = 1 << 0, + ARC_BUF_FLAG_COMPRESSED = 1 << 1, + /* + * indicates whether this arc_buf_t is encrypted, regardless of + * state on-disk + */ + ARC_BUF_FLAG_ENCRYPTED = 1 << 2 +} arc_buf_flags_t; + +struct arc_buf { + arc_buf_hdr_t *b_hdr; + arc_buf_t *b_next; + kmutex_t b_evict_lock; + void *b_data; + arc_buf_flags_t b_flags; +}; + +typedef enum arc_buf_contents { + ARC_BUFC_INVALID, /* invalid type */ + ARC_BUFC_DATA, /* buffer contains data */ + ARC_BUFC_METADATA, /* buffer contains metadata */ + ARC_BUFC_NUMTYPES +} arc_buf_contents_t; + +/* + * The following breakdowns of arc_size exist for kstat only. + */ +typedef enum arc_space_type { + ARC_SPACE_DATA, + ARC_SPACE_META, + ARC_SPACE_HDRS, + ARC_SPACE_L2HDRS, + ARC_SPACE_DBUF, + ARC_SPACE_DNODE, + ARC_SPACE_BONUS, + ARC_SPACE_ABD_CHUNK_WASTE, + ARC_SPACE_NUMTYPES +} arc_space_type_t; + +typedef enum arc_state_type { + ARC_STATE_ANON, + ARC_STATE_MRU, + ARC_STATE_MRU_GHOST, + ARC_STATE_MFU, + ARC_STATE_MFU_GHOST, + ARC_STATE_L2C_ONLY, + ARC_STATE_NUMTYPES +} arc_state_type_t; + +typedef struct arc_buf_info { + arc_state_type_t abi_state_type; + arc_buf_contents_t abi_state_contents; + uint32_t abi_flags; + uint32_t abi_bufcnt; + uint64_t abi_size; + uint64_t abi_spa; + uint64_t abi_access; + uint32_t abi_mru_hits; + uint32_t abi_mru_ghost_hits; + uint32_t abi_mfu_hits; + uint32_t abi_mfu_ghost_hits; + uint32_t abi_l2arc_hits; + uint32_t abi_holds; + uint64_t abi_l2arc_dattr; + uint64_t abi_l2arc_asize; + enum zio_compress abi_l2arc_compress; +} arc_buf_info_t; + +void arc_space_consume(uint64_t space, arc_space_type_t type); +void arc_space_return(uint64_t space, arc_space_type_t type); +boolean_t arc_is_metadata(arc_buf_t *buf); +boolean_t arc_is_encrypted(arc_buf_t *buf); +boolean_t arc_is_unauthenticated(arc_buf_t *buf); +enum zio_compress arc_get_compression(arc_buf_t *buf); +void arc_get_raw_params(arc_buf_t *buf, boolean_t *byteorder, uint8_t *salt, + uint8_t *iv, uint8_t *mac); +int arc_untransform(arc_buf_t *buf, spa_t *spa, const zbookmark_phys_t *zb, + boolean_t in_place); +void arc_convert_to_raw(arc_buf_t *buf, uint64_t dsobj, boolean_t byteorder, + dmu_object_type_t ot, const uint8_t *salt, const uint8_t *iv, + const uint8_t *mac); +arc_buf_t *arc_alloc_buf(spa_t *spa, void *tag, arc_buf_contents_t type, + int32_t size); +arc_buf_t *arc_alloc_compressed_buf(spa_t *spa, void *tag, + uint64_t psize, uint64_t lsize, enum zio_compress compression_type, + uint8_t complevel); +arc_buf_t *arc_alloc_raw_buf(spa_t *spa, void *tag, uint64_t dsobj, + boolean_t byteorder, const uint8_t *salt, const uint8_t *iv, + const uint8_t *mac, dmu_object_type_t ot, uint64_t psize, uint64_t lsize, + enum zio_compress compression_type, uint8_t complevel); +uint8_t arc_get_complevel(arc_buf_t *buf); +arc_buf_t *arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size); +arc_buf_t *arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize, + enum zio_compress compression_type, uint8_t complevel); +arc_buf_t *arc_loan_raw_buf(spa_t *spa, uint64_t dsobj, boolean_t byteorder, + const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, + dmu_object_type_t ot, uint64_t psize, uint64_t lsize, + enum zio_compress compression_type, uint8_t complevel); +void arc_return_buf(arc_buf_t *buf, void *tag); +void arc_loan_inuse_buf(arc_buf_t *buf, void *tag); +void arc_buf_destroy(arc_buf_t *buf, void *tag); +void arc_buf_info(arc_buf_t *buf, arc_buf_info_t *abi, int state_index); +uint64_t arc_buf_size(arc_buf_t *buf); +uint64_t arc_buf_lsize(arc_buf_t *buf); +void arc_buf_access(arc_buf_t *buf); +void arc_release(arc_buf_t *buf, void *tag); +int arc_released(arc_buf_t *buf); +void arc_buf_sigsegv(int sig, siginfo_t *si, void *unused); +void arc_buf_freeze(arc_buf_t *buf); +void arc_buf_thaw(arc_buf_t *buf); +#ifdef ZFS_DEBUG +int arc_referenced(arc_buf_t *buf); +#endif + +int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, + arc_read_done_func_t *done, void *priv, zio_priority_t priority, + int flags, arc_flags_t *arc_flags, const zbookmark_phys_t *zb); +zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg, + blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp, + arc_write_done_func_t *ready, arc_write_done_func_t *child_ready, + arc_write_done_func_t *physdone, arc_write_done_func_t *done, + void *priv, zio_priority_t priority, int zio_flags, + const zbookmark_phys_t *zb); + +arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *priv); +void arc_remove_prune_callback(arc_prune_t *p); +void arc_freed(spa_t *spa, const blkptr_t *bp); + +void arc_flush(spa_t *spa, boolean_t retry); +void arc_tempreserve_clear(uint64_t reserve); +int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg); + +uint64_t arc_all_memory(void); +uint64_t arc_default_max(uint64_t min, uint64_t allmem); +uint64_t arc_target_bytes(void); +void arc_init(void); +void arc_fini(void); + +/* + * Level 2 ARC + */ + +void l2arc_add_vdev(spa_t *spa, vdev_t *vd); +void l2arc_remove_vdev(vdev_t *vd); +boolean_t l2arc_vdev_present(vdev_t *vd); +void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen); +boolean_t l2arc_range_check_overlap(uint64_t bottom, uint64_t top, + uint64_t check); +void l2arc_init(void); +void l2arc_fini(void); +void l2arc_start(void); +void l2arc_stop(void); +void l2arc_spa_rebuild_start(spa_t *spa); + +#ifndef _KERNEL +extern boolean_t arc_watch; +#endif + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_ARC_H */ |