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      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 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef	_SYS_BPLIST_H
     27 #define	_SYS_BPLIST_H
     28 
     29 #include <sys/dmu.h>
     30 #include <sys/spa.h>
     31 #include <sys/txg.h>
     32 #include <sys/zfs_context.h>
     33 
     34 #ifdef	__cplusplus
     35 extern "C" {
     36 #endif
     37 
     38 typedef struct bplist_phys {
     39 	/*
     40 	 * This is the bonus buffer for the dead lists.  The object's
     41 	 * contents is an array of bpl_entries blkptr_t's, representing
     42 	 * a total of bpl_bytes physical space.
     43 	 */
     44 	uint64_t	bpl_entries;
     45 	uint64_t	bpl_bytes;
     46 	uint64_t	bpl_comp;
     47 	uint64_t	bpl_uncomp;
     48 } bplist_phys_t;
     49 
     50 #define	BPLIST_SIZE_V0	(2 * sizeof (uint64_t))
     51 
     52 typedef struct bplist_q {
     53 	blkptr_t	bpq_blk;
     54 	void		*bpq_next;
     55 } bplist_q_t;
     56 
     57 typedef struct bplist {
     58 	kmutex_t	bpl_lock;
     59 	objset_t	*bpl_mos;
     60 	uint64_t	bpl_object;
     61 	uint8_t		bpl_blockshift;
     62 	uint8_t		bpl_bpshift;
     63 	uint8_t		bpl_havecomp;
     64 	bplist_q_t	*bpl_queue;
     65 	bplist_phys_t	*bpl_phys;
     66 	dmu_buf_t	*bpl_dbuf;
     67 	dmu_buf_t	*bpl_cached_dbuf;
     68 } bplist_t;
     69 
     70 extern uint64_t bplist_create(objset_t *mos, int blocksize, dmu_tx_t *tx);
     71 extern void bplist_destroy(objset_t *mos, uint64_t object, dmu_tx_t *tx);
     72 extern int bplist_open(bplist_t *bpl, objset_t *mos, uint64_t object);
     73 extern void bplist_close(bplist_t *bpl);
     74 extern boolean_t bplist_empty(bplist_t *bpl);
     75 extern int bplist_iterate(bplist_t *bpl, uint64_t *itorp, blkptr_t *bp);
     76 extern int bplist_enqueue(bplist_t *bpl, const blkptr_t *bp, dmu_tx_t *tx);
     77 extern void bplist_enqueue_deferred(bplist_t *bpl, const blkptr_t *bp);
     78 extern void bplist_sync(bplist_t *bpl, dmu_tx_t *tx);
     79 extern void bplist_vacate(bplist_t *bpl, dmu_tx_t *tx);
     80 extern int bplist_space(bplist_t *bpl,
     81     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
     82 extern int bplist_space_birthrange(bplist_t *bpl,
     83     uint64_t mintxg, uint64_t maxtxg, uint64_t *dasizep);
     84 
     85 #ifdef	__cplusplus
     86 }
     87 #endif
     88 
     89 #endif /* _SYS_BPLIST_H */
     90