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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Miao Xie <miaoxie@huawei.com>
* with heavy changes by Gao Xiang <gaoxiang25@huawei.com>
*/
#ifndef __EROFS_CACHE_H
#define __EROFS_CACHE_H
#ifdef __cplusplus
extern "C"
{
#endif
#include "internal.h"
struct erofs_buffer_head;
struct erofs_buffer_block;
#define DATA 0
#define META 1
/* including inline xattrs, extent */
#define INODE 2
/* shared xattrs */
#define XATTR 3
/* device table */
#define DEVT 4
struct erofs_bhops {
bool (*preflush)(struct erofs_buffer_head *bh);
bool (*flush)(struct erofs_buffer_head *bh);
};
struct erofs_buffer_head {
struct list_head list;
struct erofs_buffer_block *block;
erofs_off_t off;
const struct erofs_bhops *op;
void *fsprivate;
};
struct erofs_buffer_block {
struct list_head list;
struct list_head mapped_list;
erofs_blk_t blkaddr;
int type;
struct erofs_buffer_head buffers;
};
static inline const int get_alignsize(int type, int *type_ret)
{
if (type == DATA)
return EROFS_BLKSIZ;
if (type == INODE) {
*type_ret = META;
return sizeof(struct erofs_inode_compact);
} else if (type == XATTR) {
*type_ret = META;
return sizeof(struct erofs_xattr_entry);
} else if (type == DEVT) {
*type_ret = META;
return EROFS_DEVT_SLOT_SIZE;
}
if (type == META)
return 1;
return -EINVAL;
}
extern const struct erofs_bhops erofs_drop_directly_bhops;
extern const struct erofs_bhops erofs_skip_write_bhops;
extern const struct erofs_bhops erofs_buf_write_bhops;
static inline erofs_off_t erofs_btell(struct erofs_buffer_head *bh, bool end)
{
const struct erofs_buffer_block *bb = bh->block;
if (bb->blkaddr == NULL_ADDR)
return NULL_ADDR_UL;
return blknr_to_addr(bb->blkaddr) +
(end ? list_next_entry(bh, list)->off : bh->off);
}
static inline bool erofs_bh_flush_generic_end(struct erofs_buffer_head *bh)
{
list_del(&bh->list);
free(bh);
return true;
}
struct erofs_buffer_head *erofs_buffer_init(void);
int erofs_bh_balloon(struct erofs_buffer_head *bh, erofs_off_t incr);
struct erofs_buffer_head *erofs_balloc(int type, erofs_off_t size,
unsigned int required_ext,
unsigned int inline_ext);
struct erofs_buffer_head *erofs_battach(struct erofs_buffer_head *bh,
int type, unsigned int size);
erofs_blk_t erofs_mapbh(struct erofs_buffer_block *bb);
bool erofs_bflush(struct erofs_buffer_block *bb);
void erofs_bdrop(struct erofs_buffer_head *bh, bool tryrevoke);
#ifdef __cplusplus
}
#endif
#endif
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