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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25 */ 26 27 #ifndef _SYS_ARC_H 28 #define _SYS_ARC_H 29 30 #include <sys/zfs_context.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 #include <sys/zio.h> 37 #include <sys/dmu.h> 38 #include <sys/spa.h> 39 40 /* 41 * Used by arc_flush() to inform arc_evict_state() that it should evict 42 * all available buffers from the arc state being passed in. 43 */ 44 #define ARC_EVICT_ALL -1ULL 45 46 #define HDR_SET_LSIZE(hdr, x) do { \ 47 ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \ 48 (hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \ 49 _NOTE(CONSTCOND) } while (0) 50 51 #define HDR_SET_PSIZE(hdr, x) do { \ 52 ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \ 53 (hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \ 54 _NOTE(CONSTCOND) } while (0) 55 56 #define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT) 57 #define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT) 58 59 typedef struct arc_buf_hdr arc_buf_hdr_t; 60 typedef struct arc_buf arc_buf_t; 61 62 /* 63 * Because the ARC can store encrypted data, errors (not due to bugs) may arise 64 * while transforming data into its desired format - specifically, when 65 * decrypting, the key may not be present, or the HMAC may not be correct 66 * which signifies deliberate tampering with the on-disk state 67 * (assuming that the checksum was correct). The "error" parameter will be 68 * nonzero in this case, even if there is no associated zio. 69 */ 70 typedef void arc_read_done_func_t(zio_t *zio, const zbookmark_phys_t *zb, 71 const blkptr_t *bp, arc_buf_t *buf, void *priv); 72 typedef void arc_write_done_func_t(zio_t *zio, arc_buf_t *buf, void *priv); 73 74 /* generic arc_done_func_t's which you can use */ 75 arc_read_done_func_t arc_bcopy_func; 76 arc_read_done_func_t arc_getbuf_func; 77 78 typedef enum arc_flags 79 { 80 /* 81 * Public flags that can be passed into the ARC by external consumers. 82 */ 83 ARC_FLAG_WAIT = 1 << 0, /* perform sync I/O */ 84 ARC_FLAG_NOWAIT = 1 << 1, /* perform async I/O */ 85 ARC_FLAG_PREFETCH = 1 << 2, /* I/O is a prefetch */ 86 ARC_FLAG_CACHED = 1 << 3, /* I/O was in cache */ 87 ARC_FLAG_L2CACHE = 1 << 4, /* cache in L2ARC */ 88 ARC_FLAG_PREDICTIVE_PREFETCH = 1 << 5, /* I/O from zfetch */ 89 ARC_FLAG_PRESCIENT_PREFETCH = 1 << 6, /* long min lifespan */ 90 91 /* 92 * Private ARC flags. These flags are private ARC only flags that 93 * will show up in b_flags in the arc_hdr_buf_t. These flags should 94 * only be set by ARC code. 95 */ 96 ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */ 97 ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */ 98 ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */ 99 ARC_FLAG_INDIRECT = 1 << 10, /* indirect block */ 100 /* Indicates that block was read with ASYNC priority. */ 101 ARC_FLAG_PRIO_ASYNC_READ = 1 << 11, 102 ARC_FLAG_L2_WRITING = 1 << 12, /* write in progress */ 103 ARC_FLAG_L2_EVICTED = 1 << 13, /* evicted during I/O */ 104 ARC_FLAG_L2_WRITE_HEAD = 1 << 14, /* head of write list */ 105 /* 106 * Encrypted or authenticated on disk (may be plaintext in memory). 107 * This header has b_crypt_hdr allocated. Does not include indirect 108 * blocks with checksums of MACs which will also have their X 109 * (encrypted) bit set in the bp. 110 */ 111 ARC_FLAG_PROTECTED = 1 << 15, 112 /* data has not been authenticated yet */ 113 ARC_FLAG_NOAUTH = 1 << 16, 114 /* indicates that the buffer contains metadata (otherwise, data) */ 115 ARC_FLAG_BUFC_METADATA = 1 << 17, 116 117 /* Flags specifying whether optional hdr struct fields are defined */ 118 ARC_FLAG_HAS_L1HDR = 1 << 18, 119 ARC_FLAG_HAS_L2HDR = 1 << 19, 120 121 /* 122 * Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data. 123 * This allows the l2arc to use the blkptr's checksum to verify 124 * the data without having to store the checksum in the hdr. 125 */ 126 ARC_FLAG_COMPRESSED_ARC = 1 << 20, 127 ARC_FLAG_SHARED_DATA = 1 << 21, 128 129 /* 130 * The arc buffer's compression mode is stored in the top 7 bits of the 131 * flags field, so these dummy flags are included so that MDB can 132 * interpret the enum properly. 133 */ 134 ARC_FLAG_COMPRESS_0 = 1 << 24, 135 ARC_FLAG_COMPRESS_1 = 1 << 25, 136 ARC_FLAG_COMPRESS_2 = 1 << 26, 137 ARC_FLAG_COMPRESS_3 = 1 << 27, 138 ARC_FLAG_COMPRESS_4 = 1 << 28, 139 ARC_FLAG_COMPRESS_5 = 1 << 29, 140 ARC_FLAG_COMPRESS_6 = 1 << 30 141 142 } arc_flags_t; 143 144 typedef enum arc_buf_flags { 145 ARC_BUF_FLAG_SHARED = 1 << 0, 146 ARC_BUF_FLAG_COMPRESSED = 1 << 1, 147 /* 148 * indicates whether this arc_buf_t is encrypted, regardless of 149 * state on-disk 150 */ 151 ARC_BUF_FLAG_ENCRYPTED = 1 << 2 152 } arc_buf_flags_t; 153 154 struct arc_buf { 155 arc_buf_hdr_t *b_hdr; 156 arc_buf_t *b_next; 157 kmutex_t b_evict_lock; 158 void *b_data; 159 arc_buf_flags_t b_flags; 160 }; 161 162 typedef enum arc_buf_contents { 163 ARC_BUFC_INVALID, /* invalid type */ 164 ARC_BUFC_DATA, /* buffer contains data */ 165 ARC_BUFC_METADATA, /* buffer contains metadata */ 166 ARC_BUFC_NUMTYPES 167 } arc_buf_contents_t; 168 169 /* 170 * The following breakdows of arc_size exist for kstat only. 171 */ 172 typedef enum arc_space_type { 173 ARC_SPACE_DATA, 174 ARC_SPACE_META, 175 ARC_SPACE_HDRS, 176 ARC_SPACE_L2HDRS, 177 ARC_SPACE_OTHER, 178 ARC_SPACE_BONUS, 179 ARC_SPACE_NUMTYPES 180 } arc_space_type_t; 181 182 void arc_space_consume(uint64_t space, arc_space_type_t type); 183 void arc_space_return(uint64_t space, arc_space_type_t type); 184 boolean_t arc_is_metadata(arc_buf_t *buf); 185 boolean_t arc_is_encrypted(arc_buf_t *buf); 186 boolean_t arc_is_unauthenticated(arc_buf_t *buf); 187 enum zio_compress arc_get_compression(arc_buf_t *buf); 188 void arc_get_raw_params(arc_buf_t *buf, boolean_t *byteorder, uint8_t *salt, 189 uint8_t *iv, uint8_t *mac); 190 int arc_untransform(arc_buf_t *buf, spa_t *spa, const zbookmark_phys_t *zb, 191 boolean_t in_place); 192 void arc_convert_to_raw(arc_buf_t *buf, uint64_t dsobj, boolean_t byteorder, 193 dmu_object_type_t ot, const uint8_t *salt, const uint8_t *iv, 194 const uint8_t *mac); 195 arc_buf_t *arc_alloc_buf(spa_t *spa, void *tag, arc_buf_contents_t type, 196 int32_t size); 197 arc_buf_t *arc_alloc_compressed_buf(spa_t *spa, void *tag, 198 uint64_t psize, uint64_t lsize, enum zio_compress compression_type); 199 arc_buf_t *arc_alloc_raw_buf(spa_t *spa, void *tag, uint64_t dsobj, 200 boolean_t byteorder, const uint8_t *salt, const uint8_t *iv, 201 const uint8_t *mac, dmu_object_type_t ot, uint64_t psize, uint64_t lsize, 202 enum zio_compress compression_type); 203 arc_buf_t *arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size); 204 arc_buf_t *arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize, 205 enum zio_compress compression_type); 206 arc_buf_t *arc_loan_raw_buf(spa_t *spa, uint64_t dsobj, boolean_t byteorder, 207 const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, 208 dmu_object_type_t ot, uint64_t psize, uint64_t lsize, 209 enum zio_compress compression_type); 210 void arc_return_buf(arc_buf_t *buf, void *tag); 211 void arc_loan_inuse_buf(arc_buf_t *buf, void *tag); 212 void arc_buf_destroy(arc_buf_t *buf, void *tag); 213 int arc_buf_size(arc_buf_t *buf); 214 int arc_buf_lsize(arc_buf_t *buf); 215 void arc_buf_access(arc_buf_t *buf); 216 void arc_release(arc_buf_t *buf, void *tag); 217 int arc_released(arc_buf_t *buf); 218 void arc_buf_freeze(arc_buf_t *buf); 219 void arc_buf_thaw(arc_buf_t *buf); 220 #ifdef ZFS_DEBUG 221 int arc_referenced(arc_buf_t *buf); 222 #endif 223 224 int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 225 arc_read_done_func_t *done, void *private, zio_priority_t priority, 226 int flags, arc_flags_t *arc_flags, const zbookmark_phys_t *zb); 227 zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg, 228 blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp, 229 arc_write_done_func_t *ready, arc_write_done_func_t *child_ready, 230 arc_write_done_func_t *physdone, arc_write_done_func_t *done, 231 void *private, zio_priority_t priority, int zio_flags, 232 const zbookmark_phys_t *zb); 233 void arc_freed(spa_t *spa, const blkptr_t *bp); 234 235 void arc_flush(spa_t *spa, boolean_t retry); 236 void arc_tempreserve_clear(uint64_t reserve); 237 int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg); 238 239 uint64_t arc_all_memory(void); 240 uint64_t arc_max_bytes(void); 241 void arc_init(void); 242 void arc_fini(void); 243 244 /* 245 * Level 2 ARC 246 */ 247 248 void l2arc_add_vdev(spa_t *spa, vdev_t *vd); 249 void l2arc_remove_vdev(vdev_t *vd); 250 boolean_t l2arc_vdev_present(vdev_t *vd); 251 void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen); 252 boolean_t l2arc_range_check_overlap(uint64_t bottom, uint64_t top, 253 uint64_t check); 254 void l2arc_init(void); 255 void l2arc_fini(void); 256 void l2arc_start(void); 257 void l2arc_stop(void); 258 void l2arc_spa_rebuild_start(spa_t *spa); 259 260 #ifndef _KERNEL 261 extern boolean_t arc_watch; 262 extern int arc_procfd; 263 #endif 264 265 #ifdef __cplusplus 266 } 267 #endif 268 269 #endif /* _SYS_ARC_H */ 270