[mirror_zfs-debian.git] / module / zfs / 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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>

#ifdef	__cplusplus
extern "C" {
#endif

#define	DB_BONUS_BLKID (-1ULL)
#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 -------+
 */
typedef enum dbuf_states {
	DB_UNCACHED,
	DB_FILL,
	DB_NOFILL,
	DB_READ,
	DB_CACHED,
	DB_EVICTING
} dbuf_states_t;

struct objset_impl;
struct dnode;
struct dmu_tx;

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

#define	LIST_LINK_INACTIVE(link) \
	((link)->list_next == NULL && (link)->list_prev == NULL)

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;

	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;
		} 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_impl *db_objset;

	/*
	 * the dnode we belong to (NULL when evicted)
	 */
	struct dnode *db_dnode;

	/*
	 * our parent buffer; if the dnode points to us directly,
	 * db_parent == db_dnode->dn_dbuf
	 * only accessed by sync thread ???
	 * (NULL when evicted)
	 */
	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.
	 */
	list_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 256
#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);

dmu_buf_impl_t *dbuf_create_tlib(struct dnode *dn, char *data);
void dbuf_create_bonus(struct dnode *dn);

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);

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);

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 dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
void dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx);
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);

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

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

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_init(void);
void dbuf_fini(void);

#define	DBUF_IS_METADATA(db)	\
	((db)->db_level > 0 || dmu_ot[(db)->db_dnode->dn_type].ot_metadata)

#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)))

#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);	\
	sprintf_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	/*
9babb374	22	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
34dc7c2f BB	23	* Use is subject to license terms.
	24	*/
	25
	26	#ifndef _SYS_DBUF_H
	27	#define _SYS_DBUF_H
	28
34dc7c2f BB	29	#include <sys/dmu.h>
	30	#include <sys/spa.h>
	31	#include <sys/txg.h>
	32	#include <sys/zio.h>
	33	#include <sys/arc.h>
	34	#include <sys/zfs_context.h>
	35	#include <sys/refcount.h>
	36
	37	#ifdef __cplusplus
	38	extern "C" {
	39	#endif
	40
	41	#define DB_BONUS_BLKID (-1ULL)
	42	#define IN_DMU_SYNC 2
	43
	44	/*
	45	* define flags for dbuf_read
	46	*/
	47
	48	#define DB_RF_MUST_SUCCEED (1 << 0)
	49	#define DB_RF_CANFAIL (1 << 1)
	50	#define DB_RF_HAVESTRUCT (1 << 2)
	51	#define DB_RF_NOPREFETCH (1 << 3)
	52	#define DB_RF_NEVERWAIT (1 << 4)
	53	#define DB_RF_CACHED (1 << 5)
	54
	55	/*
b128c09f	56	* The simplified state transition diagram for dbufs looks like:
34dc7c2f BB	57	*
	58	* +----> READ ----+
	59	* \| \|
	60	* \| V
	61	* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
b128c09f BB	62	* \| ^ ^
	63	* \| \| \|
	64	* +----> FILL ----+ \|
	65	* \| \|
	66	* \| \|
	67	* +--------> NOFILL -------+
34dc7c2f BB	68	*/
	69	typedef enum dbuf_states {
	70	DB_UNCACHED,
	71	DB_FILL,
b128c09f	72	DB_NOFILL,
34dc7c2f BB	73	DB_READ,
	74	DB_CACHED,
	75	DB_EVICTING
	76	} dbuf_states_t;
	77
	78	struct objset_impl;
	79	struct dnode;
	80	struct dmu_tx;
	81
	82	/*
	83	* level = 0 means the user data
	84	* level = 1 means the single indirect block
	85	* etc.
	86	*/
	87
	88	#define LIST_LINK_INACTIVE(link) \
	89	((link)->list_next == NULL && (link)->list_prev == NULL)
	90
	91	struct dmu_buf_impl;
	92
	93	typedef enum override_states {
	94	DR_NOT_OVERRIDDEN,
	95	DR_IN_DMU_SYNC,
	96	DR_OVERRIDDEN
	97	} override_states_t;
	98
	99	typedef struct dbuf_dirty_record {
	100	/* link on our parents dirty list */
	101	list_node_t dr_dirty_node;
	102
	103	/* transaction group this data will sync in */
	104	uint64_t dr_txg;
	105
	106	/* zio of outstanding write IO */
	107	zio_t *dr_zio;
	108
	109	/* pointer back to our dbuf */
	110	struct dmu_buf_impl *dr_dbuf;
	111
	112	/* pointer to next dirty record */
	113	struct dbuf_dirty_record *dr_next;
	114
	115	/* pointer to parent dirty record */
	116	struct dbuf_dirty_record *dr_parent;
	117
	118	union dirty_types {
	119	struct dirty_indirect {
	120
	121	/* protect access to list */
	122	kmutex_t dr_mtx;
	123
	124	/* Our list of dirty children */
	125	list_t dr_children;
	126	} di;
	127	struct dirty_leaf {
	128
	129	/*
	130	* dr_data is set when we dirty the buffer
	131	* so that we can retain the pointer even if it
	132	* gets COW'd in a subsequent transaction group.
	133	*/
	134	arc_buf_t *dr_data;
	135	blkptr_t dr_overridden_by;
	136	override_states_t dr_override_state;
137	} dl;
138	} dt;
139	} dbuf_dirty_record_t;
140
141	typedef struct dmu_buf_impl {
142	/*
143	* The following members are immutable, with the exception of
144	* db.db_data, which is protected by db_mtx.
145	*/
146
147	/* the publicly visible structure */
148	dmu_buf_t db;
149
150	/* the objset we belong to */
151	struct objset_impl *db_objset;
152
153	/*
154	* the dnode we belong to (NULL when evicted)
155	*/
156	struct dnode *db_dnode;
157
158	/*
159	* our parent buffer; if the dnode points to us directly,
160	* db_parent == db_dnode->dn_dbuf
161	* only accessed by sync thread ???
162	* (NULL when evicted)
163	*/
164	struct dmu_buf_impl *db_parent;
165
166	/*
167	* link for hash table of all dmu_buf_impl_t's
168	*/
169	struct dmu_buf_impl *db_hash_next;
170
171	/* our block number */
172	uint64_t db_blkid;
173
174	/*
175	* Pointer to the blkptr_t which points to us. May be NULL if we
176	* don't have one yet. (NULL when evicted)
177	*/
178	blkptr_t *db_blkptr;
179
180	/*
181	* Our indirection level. Data buffers have db_level==0.
182	* Indirect buffers which point to data buffers have
183	* db_level==1. etc. Buffers which contain dnodes have
184	* db_level==0, since the dnodes are stored in a file.
185	*/
186	uint8_t db_level;
187
188	/* db_mtx protects the members below */
189	kmutex_t db_mtx;
190
191	/*
192	* Current state of the buffer
193	*/
194	dbuf_states_t db_state;
195
196	/*
197	* Refcount accessed by dmu_buf_{hold,rele}.
198	* If nonzero, the buffer can't be destroyed.
199	* Protected by db_mtx.
200	*/
201	refcount_t db_holds;
202
203	/* buffer holding our data */
204	arc_buf_t *db_buf;
205
206	kcondvar_t db_changed;
207	dbuf_dirty_record_t *db_data_pending;
208
209	/* pointer to most recent dirty record for this buffer */
210	dbuf_dirty_record_t *db_last_dirty;
211
212	/*
213	* Our link on the owner dnodes's dn_dbufs list.
214	* Protected by its dn_dbufs_mtx.
215	*/
216	list_node_t db_link;
217
218	/* Data which is unique to data (leaf) blocks: */
219
220	/* stuff we store for the user (see dmu_buf_set_user) */
221	void *db_user_ptr;
222	void **db_user_data_ptr_ptr;
223	dmu_buf_evict_func_t *db_evict_func;
224
225	uint8_t db_immediate_evict;
226	uint8_t db_freed_in_flight;
227
228	uint8_t db_dirtycnt;
229	} dmu_buf_impl_t;
230
231	/* Note: the dbuf hash table is exposed only for the mdb module */
232	#define DBUF_MUTEXES 256
233	#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
234	typedef struct dbuf_hash_table {
235	uint64_t hash_table_mask;
236	dmu_buf_impl_t **hash_table;
237	kmutex_t hash_mutexes[DBUF_MUTEXES];
238	} dbuf_hash_table_t;
239
240
241	uint64_t dbuf_whichblock(struct dnode *di, uint64_t offset);
242
243	dmu_buf_impl_t dbuf_create_tlib(struct dnode dn, char *data);
244	void dbuf_create_bonus(struct dnode *dn);
245
246	dmu_buf_impl_t dbuf_hold(struct dnode dn, uint64_t blkid, void *tag);
247	dmu_buf_impl_t dbuf_hold_level(struct dnode dn, int level, uint64_t blkid,
248	void *tag);
249	int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
250	void tag, dmu_buf_impl_t *dbp);
251
252	void dbuf_prefetch(struct dnode *dn, uint64_t blkid);
253
254	void dbuf_add_ref(dmu_buf_impl_t db, void tag);
255	uint64_t dbuf_refcount(dmu_buf_impl_t *db);
256
257	void dbuf_rele(dmu_buf_impl_t db, void tag);
258
259	dmu_buf_impl_t dbuf_find(struct dnode dn, uint8_t level, uint64_t blkid);
260
261	int dbuf_read(dmu_buf_impl_t db, zio_t zio, uint32_t flags);
262	void dbuf_will_dirty(dmu_buf_impl_t db, dmu_tx_t tx);
34dc7c2f	263	void dbuf_fill_done(dmu_buf_impl_t db, dmu_tx_t tx);
b128c09f	264	void dmu_buf_will_not_fill(dmu_buf_t db, dmu_tx_t tx);
34dc7c2f BB	265	void dmu_buf_will_fill(dmu_buf_t db, dmu_tx_t tx);
34dc7c2f BB	266	void dmu_buf_fill_done(dmu_buf_t db, dmu_tx_t tx);
9babb374	267	void dbuf_assign_arcbuf(dmu_buf_impl_t db, arc_buf_t buf, dmu_tx_t *tx);
34dc7c2f BB	268	dbuf_dirty_record_t dbuf_dirty(dmu_buf_impl_t db, dmu_tx_t *tx);
	269
	270	void dbuf_clear(dmu_buf_impl_t *db);
	271	void dbuf_evict(dmu_buf_impl_t *db);
	272
	273	void dbuf_setdirty(dmu_buf_impl_t db, dmu_tx_t tx);
	274	void dbuf_unoverride(dbuf_dirty_record_t *dr);
	275	void dbuf_sync_list(list_t list, dmu_tx_t tx);
	276
b128c09f	277	void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
34dc7c2f BB	278	struct dmu_tx *);
	279
	280	void dbuf_new_size(dmu_buf_impl_t db, int size, dmu_tx_t tx);
	281
	282	void dbuf_init(void);
	283	void dbuf_fini(void);
	284
b128c09f BB	285	#define DBUF_IS_METADATA(db) \
	286	((db)->db_level > 0 \|\| dmu_ot[(db)->db_dnode->dn_type].ot_metadata)
	287
	288	#define DBUF_GET_BUFC_TYPE(db) \
	289	(DBUF_IS_METADATA(db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
	290
	291	#define DBUF_IS_CACHEABLE(db) \
	292	((db)->db_objset->os_primary_cache == ZFS_CACHE_ALL \|\| \
	293	(DBUF_IS_METADATA(db) && \
	294	((db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))
	295
	296	#define DBUF_IS_L2CACHEABLE(db) \
	297	((db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL \|\| \
	298	(DBUF_IS_METADATA(db) && \
	299	((db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
34dc7c2f BB	300
	301	#ifdef ZFS_DEBUG
	302
	303	/*
	304	* There should be a ## between the string literal and fmt, to make it
	305	* clear that we're joining two strings together, but gcc does not
	306	* support that preprocessor token.
	307	*/
	308	#define dprintf_dbuf(dbuf, fmt, ...) do { \
	309	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	310	char __db_buf[32]; \
	311	uint64_t __db_obj = (dbuf)->db.db_object; \
	312	if (__db_obj == DMU_META_DNODE_OBJECT) \
	313	(void) strcpy(__db_buf, "mdn"); \
	314	else \
	315	(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
	316	(u_longlong_t)__db_obj); \
	317	dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
	318	"obj=%s lvl=%u blkid=%lld " fmt, \
	319	__db_buf, (dbuf)->db_level, \
	320	(u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
	321	} \
	322	_NOTE(CONSTCOND) } while (0)
	323
	324	#define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
	325	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	326	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
	327	sprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp); \
	328	dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
	329	kmem_free(__blkbuf, BP_SPRINTF_LEN); \
	330	} \
	331	_NOTE(CONSTCOND) } while (0)
	332
	333	#define DBUF_VERIFY(db) dbuf_verify(db)
	334
	335	#else
	336
	337	#define dprintf_dbuf(db, fmt, ...)
	338	#define dprintf_dbuf_bp(db, bp, fmt, ...)
	339	#define DBUF_VERIFY(db)
	340
	341	#endif
	342
	343
	344	#ifdef __cplusplus
	345	}
	346	#endif
	347
	348	#endif /* _SYS_DBUF_H */