*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
*/
#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;
-typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
+
+/*
+ * 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 *private);
+typedef void arc_write_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
typedef void arc_prune_func_t(int64_t bytes, void *private);
-typedef int arc_evict_func_t(void *private);
/* Shared module parameters */
extern int zfs_arc_average_blocksize;
/* generic arc_done_func_t's which you can use */
-arc_done_func_t arc_bcopy_func;
-arc_done_func_t arc_getbuf_func;
+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 {
void *p_private;
uint64_t p_adjust;
list_node_t p_node;
- refcount_t p_refcnt;
+ zfs_refcount_t p_refcnt;
};
typedef enum arc_strategy {
/*
* Public flags that can be passed into the ARC by external consumers.
*/
- ARC_FLAG_NONE = 1 << 0, /* No flags set */
- ARC_FLAG_WAIT = 1 << 1, /* perform sync I/O */
- ARC_FLAG_NOWAIT = 1 << 2, /* perform async I/O */
- ARC_FLAG_PREFETCH = 1 << 3, /* I/O is a prefetch */
- ARC_FLAG_CACHED = 1 << 4, /* I/O was in cache */
- ARC_FLAG_L2CACHE = 1 << 5, /* cache in L2ARC */
- ARC_FLAG_L2COMPRESS = 1 << 6, /* compress in L2ARC */
+ 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
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_FREED_IN_READ = 1 << 10, /* freed during read */
- ARC_FLAG_BUF_AVAILABLE = 1 << 11, /* block not in use */
- ARC_FLAG_INDIRECT = 1 << 12, /* indirect block */
- ARC_FLAG_L2_WRITING = 1 << 13, /* write in progress */
- ARC_FLAG_L2_EVICTED = 1 << 14, /* evicted during I/O */
- ARC_FLAG_L2_WRITE_HEAD = 1 << 15, /* head of write list */
+ 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 << 16,
+ ARC_FLAG_BUFC_METADATA = 1 << 17,
/* Flags specifying whether optional hdr struct fields are defined */
- ARC_FLAG_HAS_L1HDR = 1 << 17,
- ARC_FLAG_HAS_L2HDR = 1 << 18,
+ 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,
/*
* The arc buffer's compression mode is stored in the top 7 bits of the
} 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_evict_func_t *b_efunc;
- void *b_private;
+ 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_SPACE_META,
ARC_SPACE_HDRS,
ARC_SPACE_L2HDRS,
- ARC_SPACE_OTHER,
+ ARC_SPACE_DBUF,
+ ARC_SPACE_DNODE,
+ ARC_SPACE_BONUS,
ARC_SPACE_NUMTYPES
} arc_space_type_t;
arc_state_type_t abi_state_type;
arc_buf_contents_t abi_state_contents;
uint32_t abi_flags;
- uint32_t abi_datacnt;
+ uint32_t abi_bufcnt;
uint64_t abi_size;
uint64_t abi_spa;
uint64_t abi_access;
void arc_space_consume(uint64_t space, arc_space_type_t type);
void arc_space_return(uint64_t space, arc_space_type_t type);
-arc_buf_t *arc_buf_alloc(spa_t *spa, uint64_t size, void *tag,
- arc_buf_contents_t type);
-arc_buf_t *arc_loan_buf(spa_t *spa, uint64_t size);
+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);
+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);
+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);
+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);
void arc_return_buf(arc_buf_t *buf, void *tag);
void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
-void arc_buf_add_ref(arc_buf_t *buf, void *tag);
-boolean_t arc_buf_remove_ref(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);
-boolean_t arc_buf_eviction_needed(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_done_func_t *done, void *private, zio_priority_t priority, int flags,
- arc_flags_t *arc_flags, const zbookmark_phys_t *zb);
+ arc_read_done_func_t *done, void *private, 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, boolean_t l2arc_compress,
- const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone,
- arc_done_func_t *done, void *private, zio_priority_t priority,
- int zio_flags, const zbookmark_phys_t *zb);
+ 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 *private, 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 *private);
void arc_remove_prune_callback(arc_prune_t *p);
void arc_freed(spa_t *spa, const blkptr_t *bp);
-void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
-boolean_t arc_clear_callback(arc_buf_t *buf);
-
void arc_flush(spa_t *spa, boolean_t retry);
void arc_tempreserve_clear(uint64_t reserve);
-int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
+int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);
+uint64_t arc_target_bytes(void);
void arc_init(void);
void arc_fini(void);
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