b394cd1e28
Approved by: pfg (mentor) MFC after: 6 months RelNotes: Yes Differential Revision: https://reviews.freebsd.org/D12087
127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*-
|
|
* Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
|
|
#define _FS_EXT2FS_EXT2_EXTENTS_H_
|
|
|
|
#include <sys/types.h>
|
|
|
|
#define EXT4_EXT_MAGIC 0xf30a
|
|
#define EXT4_MAX_BLOCKS 0xffffffff
|
|
#define EXT_INIT_MAX_LEN (1UL << 15)
|
|
#define EXT4_MAX_LEN (EXT_INIT_MAX_LEN - 1)
|
|
#define EXT4_EXT_DEPTH_MAX 5
|
|
|
|
#define EXT4_EXT_CACHE_NO 0
|
|
#define EXT4_EXT_CACHE_GAP 1
|
|
#define EXT4_EXT_CACHE_IN 2
|
|
|
|
/*
|
|
* Ext4 file system extent on disk.
|
|
*/
|
|
struct ext4_extent {
|
|
uint32_t e_blk; /* first logical block */
|
|
uint16_t e_len; /* number of blocks */
|
|
uint16_t e_start_hi; /* high 16 bits of physical block */
|
|
uint32_t e_start_lo; /* low 32 bits of physical block */
|
|
};
|
|
|
|
/*
|
|
* Extent index on disk.
|
|
*/
|
|
struct ext4_extent_index {
|
|
uint32_t ei_blk; /* indexes logical blocks */
|
|
uint32_t ei_leaf_lo; /* points to physical block of the
|
|
* next level */
|
|
uint16_t ei_leaf_hi; /* high 16 bits of physical block */
|
|
uint16_t ei_unused;
|
|
};
|
|
|
|
/*
|
|
* Extent tree header.
|
|
*/
|
|
struct ext4_extent_header {
|
|
uint16_t eh_magic; /* magic number: 0xf30a */
|
|
uint16_t eh_ecount; /* number of valid entries */
|
|
uint16_t eh_max; /* capacity of store in entries */
|
|
uint16_t eh_depth; /* the depth of extent tree */
|
|
uint32_t eh_gen; /* generation of extent tree */
|
|
};
|
|
|
|
/*
|
|
* Save cached extent.
|
|
*/
|
|
struct ext4_extent_cache {
|
|
daddr_t ec_start; /* extent start */
|
|
uint32_t ec_blk; /* logical block */
|
|
uint32_t ec_len;
|
|
uint32_t ec_type;
|
|
};
|
|
|
|
/*
|
|
* Save path to some extent.
|
|
*/
|
|
struct ext4_extent_path {
|
|
int index_count;
|
|
uint16_t ep_depth;
|
|
uint64_t ep_blk;
|
|
char *ep_data;
|
|
struct ext4_extent *ep_ext;
|
|
struct ext4_extent_index *ep_index;
|
|
struct ext4_extent_header *ep_header;
|
|
};
|
|
|
|
#define EXT_FIRST_EXTENT(hdr) ((struct ext4_extent *)(((char *)(hdr)) + \
|
|
sizeof(struct ext4_extent_header)))
|
|
#define EXT_FIRST_INDEX(hdr) ((struct ext4_extent_index *)(((char *)(hdr)) + \
|
|
sizeof(struct ext4_extent_header)))
|
|
#define EXT_LAST_EXTENT(hdr) (EXT_FIRST_EXTENT((hdr)) + (hdr)->eh_ecount - 1)
|
|
#define EXT_LAST_INDEX(hdr) (EXT_FIRST_INDEX((hdr)) + (hdr)->eh_ecount - 1)
|
|
#define EXT4_EXTENT_TAIL_OFFSET(hdr) (sizeof(struct ext4_extent_header) + \
|
|
(sizeof(struct ext4_extent) * (hdr)->eh_max))
|
|
#define EXT_HAS_FREE_INDEX(path) \
|
|
((path)->ep_header->eh_ecount < (path)->ep_header->eh_max)
|
|
#define EXT_MAX_EXTENT(hdr) (EXT_FIRST_EXTENT(hdr) + ((hdr)->eh_max) - 1)
|
|
#define EXT_MAX_INDEX(hdr) (EXT_FIRST_INDEX((hdr)) + (hdr)->eh_max - 1)
|
|
|
|
struct inode;
|
|
struct m_ext2fs;
|
|
void ext4_ext_tree_init(struct inode *ip);
|
|
int ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *);
|
|
void ext4_ext_put_cache(struct inode *, struct ext4_extent *, int);
|
|
int ext4_ext_find_extent(struct inode *, daddr_t, struct ext4_extent_path **);
|
|
void ext4_ext_path_free(struct ext4_extent_path *path);
|
|
int ext4_ext_remove_space(struct inode *ip, off_t length, int flags,
|
|
struct ucred *cred, struct thread *td);
|
|
int ext4_ext_get_blocks(struct inode *ip, int64_t iblock,
|
|
unsigned long max_blocks, struct ucred *cred, struct buf **bpp, int *allocate, uint32_t *);
|
|
#ifdef EXT2FS_DEBUG
|
|
void ext4_ext_print_extent_tree_status(struct inode * ip);
|
|
#endif
|
|
|
|
#endif /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */
|