linux/fs/omfs/bitmap.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <asm/div64.h>
#include "omfs.h"

unsigned long omfs_count_free(struct super_block *sb)
{ … }

/*
 *  Counts the run of zero bits starting at bit up to max.
 *  It handles the case where a run might spill over a buffer.
 *  Called with bitmap lock.
 */
static int count_run(unsigned long **addr, int nbits,
		int addrlen, int bit, int max)
{ … }

/*
 * Sets or clears the run of count bits starting with bit.
 * Called with bitmap lock.
 */
static int set_run(struct super_block *sb, int map,
		int nbits, int bit, int count, int set)
{ … }

/*
 * Tries to allocate exactly one block.  Returns true if successful.
 */
int omfs_allocate_block(struct super_block *sb, u64 block)
{ … }


/*
 *  Tries to allocate a set of blocks.	The request size depends on the
 *  type: for inodes, we must allocate sbi->s_mirrors blocks, and for file
 *  blocks, we try to allocate sbi->s_clustersize, but can always get away
 *  with just one block.
 */
int omfs_allocate_range(struct super_block *sb,
			int min_request,
			int max_request,
			u64 *return_block,
			int *return_size)
{ … }

/*
 * Clears count bits starting at a given block.
 */
int omfs_clear_range(struct super_block *sb, u64 block, int count)
{ … }