[mirror_zfs.git] / include / sys / dbuf.h

/*
 * 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, 2014 by Delphix. All rights reserved.
 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
 */

#ifndef	_SYS_DBUF_H
#define	_SYS_DBUF_H

#include <sys/dmu.h>
#include <sys/spa.h>
#include <sys/txg.h>
#include <sys/zio.h>
#include <sys/arc.h>
#include <sys/zfs_context.h>
#include <sys/refcount.h>
#include <sys/zrlock.h>

#ifdef	__cplusplus
extern "C" {
#endif

#define	IN_DMU_SYNC 2

/*
 * define flags for dbuf_read
 */

#define	DB_RF_MUST_SUCCEED	(1 << 0)
#define	DB_RF_CANFAIL		(1 << 1)
#define	DB_RF_HAVESTRUCT	(1 << 2)
#define	DB_RF_NOPREFETCH	(1 << 3)
#define	DB_RF_NEVERWAIT		(1 << 4)
#define	DB_RF_CACHED		(1 << 5)

/*
 * The simplified state transition diagram for dbufs looks like:
 *
 *		+----> READ ----+
 *		|		|
 *		|		V
 *  (alloc)-->UNCACHED	     CACHED-->EVICTING-->(free)
 *		|		^	 ^
 *		|		|	 |
 *		+----> FILL ----+	 |
 *		|			 |
 *		|			 |
 *		+--------> NOFILL -------+
 *
 * DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
 * to find all dbufs in a range of a dnode and must be less than any other
 * dbuf_states_t (see comment on dn_dbufs in dnode.h).
 */
typedef enum dbuf_states {
	DB_SEARCH = -1,
	DB_UNCACHED,
	DB_FILL,
	DB_NOFILL,
	DB_READ,
	DB_CACHED,
	DB_EVICTING
} dbuf_states_t;

struct dnode;
struct dmu_tx;

/*
 * level = 0 means the user data
 * level = 1 means the single indirect block
 * etc.
 */

struct dmu_buf_impl;

typedef enum override_states {
	DR_NOT_OVERRIDDEN,
	DR_IN_DMU_SYNC,
	DR_OVERRIDDEN
} override_states_t;

typedef struct dbuf_dirty_record {
	/* link on our parents dirty list */
	list_node_t dr_dirty_node;

	/* transaction group this data will sync in */
	uint64_t dr_txg;

	/* zio of outstanding write IO */
	zio_t *dr_zio;

	/* pointer back to our dbuf */
	struct dmu_buf_impl *dr_dbuf;

	/* pointer to next dirty record */
	struct dbuf_dirty_record *dr_next;

	/* pointer to parent dirty record */
	struct dbuf_dirty_record *dr_parent;

	/* How much space was changed to dsl_pool_dirty_space() for this? */
	unsigned int dr_accounted;

	union dirty_types {
		struct dirty_indirect {

			/* protect access to list */
			kmutex_t dr_mtx;

			/* Our list of dirty children */
			list_t dr_children;
		} di;
		struct dirty_leaf {

			/*
			 * dr_data is set when we dirty the buffer
			 * so that we can retain the pointer even if it
			 * gets COW'd in a subsequent transaction group.
			 */
			arc_buf_t *dr_data;
			blkptr_t dr_overridden_by;
			override_states_t dr_override_state;
			uint8_t dr_copies;
			boolean_t dr_nopwrite;
		} dl;
	} dt;
} dbuf_dirty_record_t;

typedef struct dmu_buf_impl {
	/*
	 * The following members are immutable, with the exception of
	 * db.db_data, which is protected by db_mtx.
	 */

	/* the publicly visible structure */
	dmu_buf_t db;

	/* the objset we belong to */
	struct objset *db_objset;

	/*
	 * handle to safely access the dnode we belong to (NULL when evicted)
	 */
	struct dnode_handle *db_dnode_handle;

	/*
	 * our parent buffer; if the dnode points to us directly,
	 * db_parent == db_dnode_handle->dnh_dnode->dn_dbuf
	 * only accessed by sync thread ???
	 * (NULL when evicted)
	 * May change from NULL to non-NULL under the protection of db_mtx
	 * (see dbuf_check_blkptr())
	 */
	struct dmu_buf_impl *db_parent;

	/*
	 * link for hash table of all dmu_buf_impl_t's
	 */
	struct dmu_buf_impl *db_hash_next;

	/* our block number */
	uint64_t db_blkid;

	/*
	 * Pointer to the blkptr_t which points to us. May be NULL if we
	 * don't have one yet. (NULL when evicted)
	 */
	blkptr_t *db_blkptr;

	/*
	 * Our indirection level.  Data buffers have db_level==0.
	 * Indirect buffers which point to data buffers have
	 * db_level==1. etc.  Buffers which contain dnodes have
	 * db_level==0, since the dnodes are stored in a file.
	 */
	uint8_t db_level;

	/* db_mtx protects the members below */
	kmutex_t db_mtx;

	/*
	 * Current state of the buffer
	 */
	dbuf_states_t db_state;

	/*
	 * Refcount accessed by dmu_buf_{hold,rele}.
	 * If nonzero, the buffer can't be destroyed.
	 * Protected by db_mtx.
	 */
	refcount_t db_holds;

	/* buffer holding our data */
	arc_buf_t *db_buf;

	kcondvar_t db_changed;
	dbuf_dirty_record_t *db_data_pending;

	/* pointer to most recent dirty record for this buffer */
	dbuf_dirty_record_t *db_last_dirty;

	/*
	 * Our link on the owner dnodes's dn_dbufs list.
	 * Protected by its dn_dbufs_mtx.
	 */
	avl_node_t db_link;

	/* Data which is unique to data (leaf) blocks: */

	/* stuff we store for the user (see dmu_buf_set_user) */
	void *db_user_ptr;
	void **db_user_data_ptr_ptr;
	dmu_buf_evict_func_t *db_evict_func;

	uint8_t db_immediate_evict;
	uint8_t db_freed_in_flight;

	uint8_t db_dirtycnt;
} dmu_buf_impl_t;

/* Note: the dbuf hash table is exposed only for the mdb module */
#define	DBUF_MUTEXES 8192
#define	DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
typedef struct dbuf_hash_table {
	uint64_t hash_table_mask;
	dmu_buf_impl_t **hash_table;
	kmutex_t hash_mutexes[DBUF_MUTEXES];
} dbuf_hash_table_t;


uint64_t dbuf_whichblock(struct dnode *di, uint64_t offset);

void dbuf_create_bonus(struct dnode *dn);
int dbuf_spill_set_blksz(dmu_buf_t *db, uint64_t blksz, dmu_tx_t *tx);

void dbuf_rm_spill(struct dnode *dn, dmu_tx_t *tx);

dmu_buf_impl_t *dbuf_hold(struct dnode *dn, uint64_t blkid, void *tag);
dmu_buf_impl_t *dbuf_hold_level(struct dnode *dn, int level, uint64_t blkid,
    void *tag);
int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
    void *tag, dmu_buf_impl_t **dbp);

void dbuf_prefetch(struct dnode *dn, uint64_t blkid, zio_priority_t prio);

void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
uint64_t dbuf_refcount(dmu_buf_impl_t *db);

void dbuf_rele(dmu_buf_impl_t *db, void *tag);
void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag);

dmu_buf_impl_t *dbuf_find(struct dnode *dn, uint8_t level, uint64_t blkid);

int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx);
void dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx);
dbuf_dirty_record_t *dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
arc_buf_t *dbuf_loan_arcbuf(dmu_buf_impl_t *db);
void dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
    bp_embedded_type_t etype, enum zio_compress comp,
    int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);

void dbuf_clear(dmu_buf_impl_t *db);
void dbuf_evict(dmu_buf_impl_t *db);

void dbuf_unoverride(dbuf_dirty_record_t *dr);
void dbuf_sync_list(list_t *list, dmu_tx_t *tx);
void dbuf_release_bp(dmu_buf_impl_t *db);

void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
    struct dmu_tx *);

void dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx);

void dbuf_stats_init(dbuf_hash_table_t *hash);
void dbuf_stats_destroy(void);

#define	DB_DNODE(_db)		((_db)->db_dnode_handle->dnh_dnode)
#define	DB_DNODE_LOCK(_db)	((_db)->db_dnode_handle->dnh_zrlock)
#define	DB_DNODE_ENTER(_db)	(zrl_add(&DB_DNODE_LOCK(_db)))
#define	DB_DNODE_EXIT(_db)	(zrl_remove(&DB_DNODE_LOCK(_db)))
#define	DB_DNODE_HELD(_db)	(!zrl_is_zero(&DB_DNODE_LOCK(_db)))

void dbuf_init(void);
void dbuf_fini(void);

boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);

#define	DBUF_GET_BUFC_TYPE(_db)	\
	(dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)

#define	DBUF_IS_CACHEABLE(_db)						\
	((_db)->db_objset->os_primary_cache == ZFS_CACHE_ALL ||		\
	(dbuf_is_metadata(_db) &&					\
	((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))

#define	DBUF_IS_L2CACHEABLE(_db)					\
	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL ||	\
	(dbuf_is_metadata(_db) &&					\
	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))

#define	DBUF_IS_L2COMPRESSIBLE(_db)					\
	((_db)->db_objset->os_compress != ZIO_COMPRESS_OFF ||		\
	(dbuf_is_metadata(_db) && zfs_mdcomp_disable == B_FALSE))

#ifdef ZFS_DEBUG

/*
 * There should be a ## between the string literal and fmt, to make it
 * clear that we're joining two strings together, but gcc does not
 * support that preprocessor token.
 */
#define	dprintf_dbuf(dbuf, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char __db_buf[32]; \
	uint64_t __db_obj = (dbuf)->db.db_object; \
	if (__db_obj == DMU_META_DNODE_OBJECT) \
		(void) strcpy(__db_buf, "mdn"); \
	else \
		(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
		    (u_longlong_t)__db_obj); \
	dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
	    "obj=%s lvl=%u blkid=%lld " fmt, \
	    __db_buf, (dbuf)->db_level, \
	    (u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
	} \
_NOTE(CONSTCOND) } while (0)

#define	dprintf_dbuf_bp(db, bp, fmt, ...) do {			\
	if (zfs_flags & ZFS_DEBUG_DPRINTF) {			\
	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);	\
	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp);		\
	dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf);	\
	kmem_free(__blkbuf, BP_SPRINTF_LEN);			\
	}							\
_NOTE(CONSTCOND) } while (0)

#define	DBUF_VERIFY(db)	dbuf_verify(db)

#else

#define	dprintf_dbuf(db, fmt, ...)
#define	dprintf_dbuf_bp(db, bp, fmt, ...)
#define	DBUF_VERIFY(db)

#endif


#ifdef	__cplusplus
}
#endif

#endif /* _SYS_DBUF_H */
Commit	Line	Data
34dc7c2f BB	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	/*
428870ff	22	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
8951cb8d	23	* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
3a17a7a9	24	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
34dc7c2f BB	25	*/
	26
	27	#ifndef _SYS_DBUF_H
	28	#define _SYS_DBUF_H
	29
34dc7c2f BB	30	#include <sys/dmu.h>
	31	#include <sys/spa.h>
	32	#include <sys/txg.h>
	33	#include <sys/zio.h>
	34	#include <sys/arc.h>
	35	#include <sys/zfs_context.h>
	36	#include <sys/refcount.h>
572e2857	37	#include <sys/zrlock.h>
34dc7c2f BB	38
	39	#ifdef __cplusplus
	40	extern "C" {
	41	#endif
	42
34dc7c2f BB	43	#define IN_DMU_SYNC 2
	44
	45	/*
	46	* define flags for dbuf_read
	47	*/
	48
	49	#define DB_RF_MUST_SUCCEED (1 << 0)
	50	#define DB_RF_CANFAIL (1 << 1)
	51	#define DB_RF_HAVESTRUCT (1 << 2)
	52	#define DB_RF_NOPREFETCH (1 << 3)
	53	#define DB_RF_NEVERWAIT (1 << 4)
	54	#define DB_RF_CACHED (1 << 5)
	55
	56	/*
b128c09f	57	* The simplified state transition diagram for dbufs looks like:
34dc7c2f BB	58	*
	59	* +----> READ ----+
	60	* \| \|
	61	* \| V
	62	* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
b128c09f BB	63	* \| ^ ^
	64	* \| \| \|
	65	* +----> FILL ----+ \|
	66	* \| \|
	67	* \| \|
	68	* +--------> NOFILL -------+
9925c28c AR	69	*
	70	* DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
	71	* to find all dbufs in a range of a dnode and must be less than any other
	72	* dbuf_states_t (see comment on dn_dbufs in dnode.h).
34dc7c2f BB	73	*/
34dc7c2f BB	74	typedef enum dbuf_states {
9925c28c	75	DB_SEARCH = -1,
34dc7c2f BB	76	DB_UNCACHED,
34dc7c2f BB	77	DB_FILL,
b128c09f	78	DB_NOFILL,
34dc7c2f BB	79	DB_READ,
	80	DB_CACHED,
	81	DB_EVICTING
	82	} dbuf_states_t;
	83
34dc7c2f BB	84	struct dnode;
	85	struct dmu_tx;
	86
	87	/*
	88	* level = 0 means the user data
	89	* level = 1 means the single indirect block
	90	* etc.
	91	*/
	92
34dc7c2f BB	93	struct dmu_buf_impl;
	94
	95	typedef enum override_states {
	96	DR_NOT_OVERRIDDEN,
	97	DR_IN_DMU_SYNC,
	98	DR_OVERRIDDEN
	99	} override_states_t;
	100
	101	typedef struct dbuf_dirty_record {
	102	/* link on our parents dirty list */
	103	list_node_t dr_dirty_node;
	104
	105	/* transaction group this data will sync in */
	106	uint64_t dr_txg;
	107
	108	/* zio of outstanding write IO */
	109	zio_t *dr_zio;
	110
	111	/* pointer back to our dbuf */
	112	struct dmu_buf_impl *dr_dbuf;
	113
	114	/* pointer to next dirty record */
	115	struct dbuf_dirty_record *dr_next;
	116
	117	/* pointer to parent dirty record */
	118	struct dbuf_dirty_record *dr_parent;
	119
e8b96c60 MA	120	/* How much space was changed to dsl_pool_dirty_space() for this? */
	121	unsigned int dr_accounted;
	122
34dc7c2f BB	123	union dirty_types {
	124	struct dirty_indirect {
	125
	126	/* protect access to list */
	127	kmutex_t dr_mtx;
	128
	129	/* Our list of dirty children */
	130	list_t dr_children;
	131	} di;
	132	struct dirty_leaf {
	133
	134	/*
	135	* dr_data is set when we dirty the buffer
	136	* so that we can retain the pointer even if it
	137	* gets COW'd in a subsequent transaction group.
	138	*/
	139	arc_buf_t *dr_data;
	140	blkptr_t dr_overridden_by;
	141	override_states_t dr_override_state;
428870ff	142	uint8_t dr_copies;
03c6040b	143	boolean_t dr_nopwrite;
34dc7c2f BB	144	} dl;
	145	} dt;
	146	} dbuf_dirty_record_t;
	147
	148	typedef struct dmu_buf_impl {
	149	/*
	150	* The following members are immutable, with the exception of
	151	* db.db_data, which is protected by db_mtx.
	152	*/
	153
	154	/* the publicly visible structure */
	155	dmu_buf_t db;
	156
	157	/* the objset we belong to */
428870ff	158	struct objset *db_objset;
34dc7c2f BB	159
34dc7c2f BB	160	/*
572e2857	161	* handle to safely access the dnode we belong to (NULL when evicted)
34dc7c2f	162	*/
572e2857	163	struct dnode_handle *db_dnode_handle;
34dc7c2f BB	164
	165	/*
	166	* our parent buffer; if the dnode points to us directly,
572e2857	167	* db_parent == db_dnode_handle->dnh_dnode->dn_dbuf
34dc7c2f BB	168	* only accessed by sync thread ???
34dc7c2f BB	169	* (NULL when evicted)
572e2857 BB	170	* May change from NULL to non-NULL under the protection of db_mtx
572e2857 BB	171	* (see dbuf_check_blkptr())
34dc7c2f BB	172	*/
	173	struct dmu_buf_impl *db_parent;
	174
	175	/*
	176	* link for hash table of all dmu_buf_impl_t's
	177	*/
	178	struct dmu_buf_impl *db_hash_next;
	179
	180	/* our block number */
	181	uint64_t db_blkid;
	182
	183	/*
	184	* Pointer to the blkptr_t which points to us. May be NULL if we
	185	* don't have one yet. (NULL when evicted)
	186	*/
	187	blkptr_t *db_blkptr;
	188
	189	/*
	190	* Our indirection level. Data buffers have db_level==0.
	191	* Indirect buffers which point to data buffers have
	192	* db_level==1. etc. Buffers which contain dnodes have
	193	* db_level==0, since the dnodes are stored in a file.
	194	*/
	195	uint8_t db_level;
	196
	197	/* db_mtx protects the members below */
	198	kmutex_t db_mtx;
	199
	200	/*
	201	* Current state of the buffer
	202	*/
	203	dbuf_states_t db_state;
	204
	205	/*
	206	* Refcount accessed by dmu_buf_{hold,rele}.
	207	* If nonzero, the buffer can't be destroyed.
	208	* Protected by db_mtx.
	209	*/
	210	refcount_t db_holds;
	211
	212	/* buffer holding our data */
	213	arc_buf_t *db_buf;
	214
	215	kcondvar_t db_changed;
	216	dbuf_dirty_record_t *db_data_pending;
	217
	218	/* pointer to most recent dirty record for this buffer */
	219	dbuf_dirty_record_t *db_last_dirty;
	220
	221	/*
	222	* Our link on the owner dnodes's dn_dbufs list.
	223	* Protected by its dn_dbufs_mtx.
	224	*/
8951cb8d	225	avl_node_t db_link;
34dc7c2f BB	226
	227	/* Data which is unique to data (leaf) blocks: */
	228
	229	/* stuff we store for the user (see dmu_buf_set_user) */
	230	void *db_user_ptr;
	231	void **db_user_data_ptr_ptr;
	232	dmu_buf_evict_func_t *db_evict_func;
	233
	234	uint8_t db_immediate_evict;
	235	uint8_t db_freed_in_flight;
	236
	237	uint8_t db_dirtycnt;
	238	} dmu_buf_impl_t;
	239
	240	/* Note: the dbuf hash table is exposed only for the mdb module */
b31d8ea7	241	#define DBUF_MUTEXES 8192
34dc7c2f BB	242	#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
	243	typedef struct dbuf_hash_table {
	244	uint64_t hash_table_mask;
	245	dmu_buf_impl_t **hash_table;
	246	kmutex_t hash_mutexes[DBUF_MUTEXES];
	247	} dbuf_hash_table_t;
	248
	249
	250	uint64_t dbuf_whichblock(struct dnode *di, uint64_t offset);
	251
34dc7c2f	252	void dbuf_create_bonus(struct dnode *dn);
428870ff	253	int dbuf_spill_set_blksz(dmu_buf_t db, uint64_t blksz, dmu_tx_t tx);
428870ff BB	254
428870ff BB	255	void dbuf_rm_spill(struct dnode dn, dmu_tx_t tx);
34dc7c2f BB	256
	257	dmu_buf_impl_t dbuf_hold(struct dnode dn, uint64_t blkid, void *tag);
	258	dmu_buf_impl_t dbuf_hold_level(struct dnode dn, int level, uint64_t blkid,
	259	void *tag);
	260	int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
	261	void tag, dmu_buf_impl_t *dbp);
	262
e8b96c60	263	void dbuf_prefetch(struct dnode *dn, uint64_t blkid, zio_priority_t prio);
34dc7c2f BB	264
	265	void dbuf_add_ref(dmu_buf_impl_t db, void tag);
	266	uint64_t dbuf_refcount(dmu_buf_impl_t *db);
	267
	268	void dbuf_rele(dmu_buf_impl_t db, void tag);
428870ff	269	void dbuf_rele_and_unlock(dmu_buf_impl_t db, void tag);
34dc7c2f BB	270
	271	dmu_buf_impl_t dbuf_find(struct dnode dn, uint8_t level, uint64_t blkid);
	272
	273	int dbuf_read(dmu_buf_impl_t db, zio_t zio, uint32_t flags);
b128c09f	274	void dmu_buf_will_not_fill(dmu_buf_t db, dmu_tx_t tx);
34dc7c2f BB	275	void dmu_buf_will_fill(dmu_buf_t db, dmu_tx_t tx);
34dc7c2f BB	276	void dmu_buf_fill_done(dmu_buf_t db, dmu_tx_t tx);
9babb374	277	void dbuf_assign_arcbuf(dmu_buf_impl_t db, arc_buf_t buf, dmu_tx_t *tx);
34dc7c2f	278	dbuf_dirty_record_t dbuf_dirty(dmu_buf_impl_t db, dmu_tx_t *tx);
428870ff	279	arc_buf_t dbuf_loan_arcbuf(dmu_buf_impl_t db);
9b67f605 MA	280	void dmu_buf_write_embedded(dmu_buf_t dbuf, void data,
	281	bp_embedded_type_t etype, enum zio_compress comp,
	282	int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);
34dc7c2f BB	283
	284	void dbuf_clear(dmu_buf_impl_t *db);
	285	void dbuf_evict(dmu_buf_impl_t *db);
	286
34dc7c2f BB	287	void dbuf_unoverride(dbuf_dirty_record_t *dr);
34dc7c2f BB	288	void dbuf_sync_list(list_t list, dmu_tx_t tx);
428870ff	289	void dbuf_release_bp(dmu_buf_impl_t *db);
34dc7c2f	290
b128c09f	291	void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
34dc7c2f BB	292	struct dmu_tx *);
	293
	294	void dbuf_new_size(dmu_buf_impl_t db, int size, dmu_tx_t tx);
	295
e0b0ca98 BB	296	void dbuf_stats_init(dbuf_hash_table_t *hash);
	297	void dbuf_stats_destroy(void);
	298
572e2857 BB	299	#define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
	300	#define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
	301	#define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))
	302	#define DB_DNODE_EXIT(_db) (zrl_remove(&DB_DNODE_LOCK(_db)))
	303	#define DB_DNODE_HELD(_db) (!zrl_is_zero(&DB_DNODE_LOCK(_db)))
572e2857	304
34dc7c2f BB	305	void dbuf_init(void);
	306	void dbuf_fini(void);
	307
572e2857 BB	308	boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);
572e2857 BB	309
572e2857	310	#define DBUF_GET_BUFC_TYPE(_db) \
13fe0198	311	(dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
b128c09f	312
572e2857 BB	313	#define DBUF_IS_CACHEABLE(_db) \
572e2857 BB	314	((_db)->db_objset->os_primary_cache == ZFS_CACHE_ALL \|\| \
13fe0198	315	(dbuf_is_metadata(_db) && \
572e2857	316	((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))
b128c09f	317
572e2857 BB	318	#define DBUF_IS_L2CACHEABLE(_db) \
572e2857 BB	319	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL \|\| \
13fe0198	320	(dbuf_is_metadata(_db) && \
572e2857	321	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
34dc7c2f	322
3a17a7a9	323	#define DBUF_IS_L2COMPRESSIBLE(_db) \
4e59f475 SK	324	((_db)->db_objset->os_compress != ZIO_COMPRESS_OFF \|\| \
4e59f475 SK	325	(dbuf_is_metadata(_db) && zfs_mdcomp_disable == B_FALSE))
3a17a7a9	326
34dc7c2f BB	327	#ifdef ZFS_DEBUG
	328
	329	/*
	330	* There should be a ## between the string literal and fmt, to make it
	331	* clear that we're joining two strings together, but gcc does not
	332	* support that preprocessor token.
	333	*/
	334	#define dprintf_dbuf(dbuf, fmt, ...) do { \
	335	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	336	char __db_buf[32]; \
	337	uint64_t __db_obj = (dbuf)->db.db_object; \
	338	if (__db_obj == DMU_META_DNODE_OBJECT) \
	339	(void) strcpy(__db_buf, "mdn"); \
	340	else \
	341	(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
	342	(u_longlong_t)__db_obj); \
	343	dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
	344	"obj=%s lvl=%u blkid=%lld " fmt, \
	345	__db_buf, (dbuf)->db_level, \
	346	(u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
	347	} \
	348	_NOTE(CONSTCOND) } while (0)
	349
79c76d5b BB	350	#define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
	351	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	352	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
b0bc7a84	353	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp); \
79c76d5b BB	354	dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
	355	kmem_free(__blkbuf, BP_SPRINTF_LEN); \
	356	} \
34dc7c2f BB	357	_NOTE(CONSTCOND) } while (0)
	358
	359	#define DBUF_VERIFY(db) dbuf_verify(db)
	360
	361	#else
	362
	363	#define dprintf_dbuf(db, fmt, ...)
	364	#define dprintf_dbuf_bp(db, bp, fmt, ...)
	365	#define DBUF_VERIFY(db)
	366
	367	#endif
	368
	369
	370	#ifdef __cplusplus
	371	}
	372	#endif
	373
	374	#endif /* _SYS_DBUF_H */