ref: 733c5d6645b133b60d304c38fcb1398f94d0618c
dir: /sys/src/cmd/ext4srv/include/ext4_super.h/
#pragma once
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_misc.h"
/**@brief Blocks count get stored in superblock.
* @param s superblock descriptor
* @return count of blocks*/
static inline u64int ext4_sb_get_blocks_cnt(struct ext4_sblock *s)
{
return ((u64int)to_le32(s->blocks_count_hi) << 32) |
to_le32(s->blocks_count_lo);
}
/**@brief Blocks count set in superblock.
* @param s superblock descriptor
* @return count of blocks*/
static inline void ext4_sb_set_blocks_cnt(struct ext4_sblock *s, u64int cnt)
{
s->blocks_count_lo = to_le32((cnt << 32) >> 32);
s->blocks_count_hi = to_le32(cnt >> 32);
}
/**@brief Free blocks count get stored in superblock.
* @param s superblock descriptor
* @return free blocks*/
static inline u64int ext4_sb_get_free_blocks_cnt(struct ext4_sblock *s)
{
return ((u64int)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,
u64int 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 u32int 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 u16int ext4_sb_get_desc_size(struct ext4_sblock *s)
{
u16int 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, u32int 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_feature_com(struct ext4_sblock *s, u32int 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_feature_incom(struct ext4_sblock *s, u32int 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_feature_ro_com(struct ext4_sblock *s, u32int v)
{
return to_le32(s->features_read_only) & v;
}
/**@brief Block group to flex group.
* @param s superblock descriptor
* @param block_group block group
* @return flex group id*/
static inline u32int ext4_sb_bg_to_flex(struct ext4_sblock *s,
u32int block_group)
{
return block_group >> to_le32(s->log_groups_per_flex);
}
/**@brief Flex block group size.
* @param s superblock descriptor
* @return flex bg size*/
static inline u32int ext4_sb_flex_bg_size(struct ext4_sblock *s)
{
return 1 << to_le32(s->log_groups_per_flex);
}
/**@brief Return first meta block group id.
* @param s superblock descriptor
* @return first meta_bg id */
static inline u32int ext4_sb_first_meta_bg(struct ext4_sblock *s)
{
return to_le32(s->first_meta_bg);
}
/**************************More complex functions****************************/
/**@brief Returns a block group count.
* @param s superblock descriptor
* @return count of block groups*/
u32int 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*/
u32int ext4_blocks_in_group_cnt(struct ext4_sblock *s, u32int 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*/
u32int ext4_inodes_in_group_cnt(struct ext4_sblock *s, u32int bgid);
/***************************Read/write/check superblock**********************/
/**@brief Superblock write.
* @param bdev block device descriptor.
* @param s superblock descriptor
* @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 descriptor
* @return Standard error code */
int ext4_sb_read(struct ext4_blockdev *bdev, struct ext4_sblock *s);
/**@brief Superblock simple validation.
* @param s superblock descriptor
* @return true if OK*/
bool ext4_sb_check(struct ext4_sblock *s);
/**@brief Superblock presence in block group.
* @param s superblock descriptor
* @param block_group block group id
* @return true if block group has superblock*/
bool ext4_sb_is_super_in_bg(struct ext4_sblock *s, u32int block_group);
/**@brief TODO:*/
bool ext4_sb_sparse(u32int group);
/**@brief TODO:*/
u32int ext4_bg_num_gdb(struct ext4_sblock *s, u32int group);
/**@brief TODO:*/
u32int ext4_num_base_meta_clusters(struct ext4_sblock *s,
u32int block_group);
/**@brief TODO:*/
void ext4_sb_set_csum(struct ext4_sblock *s);