ref: a3f2d6d23ed1be69fee607bdedadc0438fd01305
dir: /sys/src/cmd/ext4srv/include/ext4_block_group.h/
#pragma once
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_super.h"
/**@brief Get address of block with data block bitmap.
* @param bg pointer to block group
* @param s pointer to superblock
* @return Address of block with block bitmap
*/
static inline u64int ext4_bg_get_block_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u64int v = to_le32(bg->block_bitmap_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u64int)to_le32(bg->block_bitmap_hi) << 32;
return v;
}
/**@brief Set address of block with data block bitmap.
* @param bg pointer to block group
* @param s pointer to superblock
* @param blk block to set
* @return Address of block with block bitmap
*/
static inline void ext4_bg_set_block_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s, u64int blk)
{
bg->block_bitmap_lo = to_le32((u32int)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->block_bitmap_hi = to_le32(blk >> 32);
}
/**@brief Get address of block with i-node bitmap.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Address of block with i-node bitmap
*/
static inline u64int ext4_bg_get_inode_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u64int v = to_le32(bg->inode_bitmap_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u64int)to_le32(bg->inode_bitmap_hi) << 32;
return v;
}
/**@brief Set address of block with i-node bitmap.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param blk block to set
* @return Address of block with i-node bitmap
*/
static inline void ext4_bg_set_inode_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s, u64int blk)
{
bg->inode_bitmap_lo = to_le32((u32int)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->inode_bitmap_hi = to_le32(blk >> 32);
}
/**@brief Get address of the first block of the i-node table.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Address of first block of i-node table
*/
static inline u64int
ext4_bg_get_inode_table_first_block(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u64int v = to_le32(bg->inode_table_first_block_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u64int)to_le32(bg->inode_table_first_block_hi) << 32;
return v;
}
/**@brief Set address of the first block of the i-node table.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param blk block to set
* @return Address of first block of i-node table
*/
static inline void
ext4_bg_set_inode_table_first_block(struct ext4_bgroup *bg,
struct ext4_sblock *s, u64int blk)
{
bg->inode_table_first_block_lo = to_le32((u32int)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->inode_table_first_block_hi = to_le32(blk >> 32);
}
/**@brief Get number of free blocks in block group.
* @param bg Pointer to block group
* @param sb Pointer to superblock
* @return Number of free blocks in block group
*/
static inline u32int ext4_bg_get_free_blocks_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u32int v = to_le16(bg->free_blocks_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u32int)to_le16(bg->free_blocks_count_hi) << 16;
return v;
}
/**@brief Set number of free blocks in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of free blocks in block group
*/
static inline void ext4_bg_set_free_blocks_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
u32int cnt)
{
bg->free_blocks_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->free_blocks_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of free i-nodes in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of free i-nodes in block group
*/
static inline u32int ext4_bg_get_free_inodes_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u32int v = to_le16(bg->free_inodes_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u32int)to_le16(bg->free_inodes_count_hi) << 16;
return v;
}
/**@brief Set number of free i-nodes in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of free i-nodes in block group
*/
static inline void ext4_bg_set_free_inodes_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
u32int cnt)
{
bg->free_inodes_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->free_inodes_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of used directories in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of used directories in block group
*/
static inline u32int ext4_bg_get_used_dirs_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u32int v = to_le16(bg->used_dirs_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u32int)to_le16(bg->used_dirs_count_hi) << 16;
return v;
}
/**@brief Set number of used directories in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of used directories in block group
*/
static inline void ext4_bg_set_used_dirs_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
u32int cnt)
{
bg->used_dirs_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->used_dirs_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of unused i-nodes.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of unused i-nodes
*/
static inline u32int ext4_bg_get_itable_unused(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
u32int v = to_le16(bg->itable_unused_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (u32int)to_le16(bg->itable_unused_hi) << 16;
return v;
}
/**@brief Set number of unused i-nodes.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of unused i-nodes
*/
static inline void ext4_bg_set_itable_unused(struct ext4_bgroup *bg,
struct ext4_sblock *s,
u32int cnt)
{
bg->itable_unused_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->itable_unused_hi = to_le16(cnt >> 16);
}
/**@brief Set checksum of block group.
* @param bg Pointer to block group
* @param crc Cheksum of block group
*/
static inline void ext4_bg_set_checksum(struct ext4_bgroup *bg, u16int crc)
{
bg->checksum = to_le16(crc);
}
/**@brief Check if block group has a flag.
* @param bg Pointer to block group
* @param flag Flag to be checked
* @return True if flag is set to 1
*/
static inline bool ext4_bg_has_flag(struct ext4_bgroup *bg, u32int f)
{
return to_le16(bg->flags) & f;
}
/**@brief Set flag of block group.
* @param bg Pointer to block group
* @param flag Flag to be set
*/
static inline void ext4_bg_set_flag(struct ext4_bgroup *bg, u32int f)
{
u16int flags = to_le16(bg->flags);
flags |= f;
bg->flags = to_le16(flags);
}
/**@brief Clear flag of block group.
* @param bg Pointer to block group
* @param flag Flag to be cleared
*/
static inline void ext4_bg_clear_flag(struct ext4_bgroup *bg, u32int f)
{
u16int flags = to_le16(bg->flags);
flags &= ~f;
bg->flags = to_le16(flags);
}
/**@brief Calculate CRC16 of the block group.
* @param crc Init value
* @param buffer Input buffer
* @param len Sizeof input buffer
* @return Computed CRC16*/
u16int ext4_bg_crc16(u16int crc, const u8int *buffer, usize len);