ref: a3f2d6d23ed1be69fee607bdedadc0438fd01305
dir: /sys/src/cmd/ext4srv/include/ext4_balloc.h/
#pragma once #include "ext4_config.h" #include "ext4_types.h" #include "ext4_fs.h" /**@brief Compute number of block group from block address. * @param sb superblock pointer. * @param baddr Absolute address of block. * @return Block group index */ u32int ext4_balloc_get_bgid_of_block(struct ext4_sblock *s, ext4_fsblk_t baddr); /**@brief Compute the starting block address of a block group * @param sb superblock pointer. * @param bgid block group index * @return Block address */ ext4_fsblk_t ext4_balloc_get_block_of_bgid(struct ext4_sblock *s, u32int bgid); /**@brief Calculate and set checksum of block bitmap. * @param sb superblock pointer. * @param bg block group * @param bitmap bitmap buffer */ void ext4_balloc_set_bitmap_csum(struct ext4_fs *fs, struct ext4_bgroup *bg, void *bitmap); /**@brief Free block from inode. * @param inode_ref inode reference * @param baddr block address * @return standard error code*/ int ext4_balloc_free_block(struct ext4_inode_ref *inode_ref, ext4_fsblk_t baddr); /**@brief Free blocks from inode. * @param inode_ref inode reference * @param first block address * @param count block count * @return standard error code*/ int ext4_balloc_free_blocks(struct ext4_inode_ref *inode_ref, ext4_fsblk_t first, u32int count); /**@brief Allocate block procedure. * @param inode_ref inode reference * @param goal * @param baddr allocated block address * @return standard error code*/ int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref, ext4_fsblk_t goal, ext4_fsblk_t *baddr); /**@brief Try allocate selected block. * @param inode_ref inode reference * @param baddr block address to allocate * @param free if baddr is not allocated * @return standard error code*/ int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref, ext4_fsblk_t baddr, bool *free);