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/*
* s3backer - FUSE-based single file backing store via Amazon S3
*
* Copyright 2008-2011 Archie L. Cobbs <archie@dellroad.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations including
* the two.
*
* You must obey the GNU General Public License in all respects for all
* of the code used other than OpenSSL. If you modify file(s) with this
* exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do
* so, delete this exception statement from your version. If you delete
* this exception statement from all source files in the program, then
* also delete it here.
*/
/*
* Simple on-disk persistent cache.
*/
/* Definitions */
typedef int s3b_dcache_visit_t(void *arg, s3b_block_t dslot, s3b_block_t block_num, const u_char *md5);
/* Declarations */
struct s3b_dcache;
/* dcache.c */
extern int s3b_dcache_open(struct s3b_dcache **dcachep, log_func_t *log, const char *filename,
u_int block_size, u_int max_blocks, s3b_dcache_visit_t *visitor, void *arg);
extern void s3b_dcache_close(struct s3b_dcache *dcache);
extern u_int s3b_dcache_size(struct s3b_dcache *dcache);
extern int s3b_dcache_alloc_block(struct s3b_dcache *priv, u_int *dslotp);
extern int s3b_dcache_record_block(struct s3b_dcache *priv, u_int dslot, s3b_block_t block_num, const u_char *md5);
extern int s3b_dcache_erase_block(struct s3b_dcache *priv, u_int dslot);
extern int s3b_dcache_free_block(struct s3b_dcache *dcache, u_int dslot);
extern int s3b_dcache_read_block(struct s3b_dcache *dcache, u_int dslot, void *dest, u_int off, u_int len);
extern int s3b_dcache_write_block(struct s3b_dcache *dcache, u_int dslot, const void *src, u_int off, u_int len);
extern int s3b_dcache_fsync(struct s3b_dcache *dcache);
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