ref: 34dd7330431c99292c332c724e0e493b08e40bd6
dir: /lwext4/ext4_super.h/
/*
* Copyright (c) 2013 Grzegorz Kostka ([email protected])
*
*
* HelenOS:
* Copyright (c) 2012 Martin Sucha
* Copyright (c) 2012 Frantisek Princ
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/** @addtogroup lwext4
* @{
*/
/**
* @file ext4_super.c
* @brief Superblock operations.
*/
#ifndef EXT4_SUPER_H_
#define EXT4_SUPER_H_
#include <ext4_config.h>
#include <ext4_types.h>
/**@brief Blocks count get stored in superblock.
* @param s superblock descriptor
* @return count of blocks*/
static inline uint64_t ext4_sb_get_blocks_cnt(struct ext4_sblock *s)
{
return ((uint64_t) to_le32(s->blocks_count_hi) << 32) |
to_le32(s->blocks_count_lo);
}
/**@brief Free blocks count get stored in superblock.
* @param s superblock descriptor
* @return free blocks*/
static inline uint64_t ext4_sb_get_free_blocks_cnt(struct ext4_sblock *s)
{
return ((uint64_t) to_le32(s->free_blocks_count_hi) << 32) |
to_le32(s->free_blocks_count_lo);
}
/**@brief Free blocks count set.
* @param s superblock descriptor
* @param cnt new value of free blocks*/
static inline void ext4_sb_set_free_blocks_cnt(struct ext4_sblock *s,
uint64_t cnt)
{
s->free_blocks_count_lo = to_le32((cnt << 32) >> 32);
s->free_blocks_count_hi = to_le32(cnt >> 32);
}
/**@brief Block size get from superblock.
* @param s superblock descriptor
* @return block size in bytes*/
static inline uint32_t ext4_sb_get_block_size(struct ext4_sblock *s)
{
return 1024 << to_le32(s->log_block_size);
}
/**@brief Block group descriptor size.
* @param s superblock descriptor
* @return block group descriptor size in bytes*/
static inline uint16_t ext4_sb_get_desc_size(struct ext4_sblock *s)
{
uint16_t size = to_le16(s->desc_size);
return size < EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE ?
EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE : size;
}
/*************************Flags and features*********************************/
/**@brief Support check of flag.
* @param s superblock descriptor
* @param v flag to check
* @return true if flag is supported*/
static inline bool ext4_sb_check_flag(struct ext4_sblock *s, uint32_t v)
{
return to_le32(s->flags) & v;
}
/**@brief Support check of feature compatible.
* @param s superblock descriptor
* @param v feature to check
* @return true if feature is supported*/
static inline bool ext4_sb_check_feature_compatible(struct ext4_sblock *s,
uint32_t v)
{
return to_le32(s->features_compatible) & v;
}
/**@brief Support check of feature incompatible.
* @param s superblock descriptor
* @param v feature to check
* @return true if feature is supported*/
static inline bool ext4_sb_check_feature_incompatible(struct ext4_sblock *s,
uint32_t v)
{
return to_le32(s->features_incompatible) & v;
}
/**@brief Support check of read only flag.
* @param s superblock descriptor
* @param v flag to check
* @return true if flag is supported*/
static inline bool ext4_sb_check_read_only(struct ext4_sblock *s, uint32_t v)
{
return to_le32(s->features_read_only) & v;
}
/**************************More complex functions****************************/
/**@brief Returns a block group count.
* @param s superblock descriptor
* @return count of block groups*/
uint32_t ext4_block_group_cnt(struct ext4_sblock *s);
/**@brief Returns block count in block group
* (last block group may have less blocks)
* @param s superblock descriptor
* @param bgid block group id
* @return blocks count*/
uint32_t ext4_blocks_in_group_cnt(struct ext4_sblock *s, uint32_t bgid);
/**@brief Returns inodes count in block group
* (last block group may have less inodes)
* @param s superblock descriptor
* @param bgid block group id
* @return inodes count*/
uint32_t ext4_inodes_in_group_cnt(struct ext4_sblock *s, uint32_t bgid);
/***************************Read/write/check superblock**********************/
/**@brief Superblock write.
* @param bdev block device descriptor.
* @param s superblock descruptor
* @return Standard error code */
int ext4_sb_write(struct ext4_blockdev *bdev, struct ext4_sblock *s);
/**@brief Superblock read.
* @param bdev block device descriptor.
* @param s superblock descruptor
* @return Standard error code */
int ext4_sb_read(struct ext4_blockdev *bdev, struct ext4_sblock *s);
/**@brief Superblock simple validation.
* @param s superblock dsecriptor
* @return true if OK*/
bool ext4_sb_check(struct ext4_sblock *s);
#endif /* EXT4_SUPER_H_ */
/**
* @}
*/