/*

 * alloc_stats.c --- Update allocation statistics for ext2fs

 *

 * Copyright (C) 2001 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Library

 * General Public License, version 2.

 * %End-Header%

 */

#include "config.h"

#include <stdio.h>

#include "ext2_fs.h"

#include "ext2fs.h"

void ext2fs_inode_alloc_stats2(ext2_filsys fs, ext2_ino_t ino,

			       int inuse, int isdir)

{

	int	group = ext2fs_group_of_ino(fs, ino);

	if (ino > fs->super->s_inodes_count) {

#ifndef OMIT_COM_ERR

		com_err("ext2fs_inode_alloc_stats2", 0,

			"Illegal inode number: %lu", (unsigned long) ino);

#endif

		return;

	}

	if (inuse > 0)

		ext2fs_mark_inode_bitmap2(fs->inode_map, ino);

	else

		ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);

	ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) - inuse);

	if (isdir)

		ext2fs_bg_used_dirs_count_set(fs, group, ext2fs_bg_used_dirs_count(fs, group) + inuse);

	/* We don't strictly need to be clearing the uninit flag if inuse < 0

	 * (i.e. freeing inodes) but it also means something is bad. */

	ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);

	if (ext2fs_has_group_desc_csum(fs)) {

		ext2_ino_t first_unused_inode =	fs->super->s_inodes_per_group -

			ext2fs_bg_itable_unused(fs, group) +

			group * fs->super->s_inodes_per_group + 1;

		if (ino >= first_unused_inode)

			ext2fs_bg_itable_unused_set(fs, group, group * fs->super->s_inodes_per_group + fs->super->s_inodes_per_group - ino);

		ext2fs_group_desc_csum_set(fs, group);

	}

	fs->super->s_free_inodes_count -= inuse;

	ext2fs_mark_super_dirty(fs);

	ext2fs_mark_ib_dirty(fs);

}

void ext2fs_inode_alloc_stats(ext2_filsys fs, ext2_ino_t ino, int inuse)

{

	ext2fs_inode_alloc_stats2(fs, ino, inuse, 0);

}

void ext2fs_block_alloc_stats2(ext2_filsys fs, blk64_t blk, int inuse)

{

	int	group = ext2fs_group_of_blk2(fs, blk);

	if (blk >= ext2fs_blocks_count(fs->super)) {

#ifndef OMIT_COM_ERR

		com_err("ext2fs_block_alloc_stats", 0,

			"Illegal block number: %lu", (unsigned long) blk);

#endif

		return;

	}

	if (inuse > 0)

		ext2fs_mark_block_bitmap2(fs->block_map, blk);

	else

		ext2fs_unmark_block_bitmap2(fs->block_map, blk);

	ext2fs_bg_free_blocks_count_set(fs, group, ext2fs_bg_free_blocks_count(fs, group) - inuse);

	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);

	ext2fs_group_desc_csum_set(fs, group);

	ext2fs_free_blocks_count_add(fs->super,

			     -inuse * (blk64_t) EXT2FS_CLUSTER_RATIO(fs));

	ext2fs_mark_super_dirty(fs);

	ext2fs_mark_bb_dirty(fs);

	if (fs->block_alloc_stats)

		(fs->block_alloc_stats)(fs, (blk64_t) blk, inuse);

}

void ext2fs_block_alloc_stats(ext2_filsys fs, blk_t blk, int inuse)

{

	ext2fs_block_alloc_stats2(fs, blk, inuse);

}

void ext2fs_set_block_alloc_stats_callback(ext2_filsys fs,

					   void (*func)(ext2_filsys fs,

							blk64_t blk,

							int inuse),

					   void (**old)(ext2_filsys fs,

							blk64_t blk,

							int inuse))

{

	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)

		return;

	if (old)

		*old = fs->block_alloc_stats;

	fs->block_alloc_stats = func;

}

void ext2fs_block_alloc_stats_range(ext2_filsys fs, blk64_t blk,

				    blk_t num, int inuse)

{

#ifndef OMIT_COM_ERR

	if (blk + num > ext2fs_blocks_count(fs->super)) {

		com_err("ext2fs_block_alloc_stats_range", 0,

			"Illegal block range: %llu (%u) ",

			(unsigned long long) blk, num);

		return;

	}

#endif

	if (inuse == 0)

		return;

	if (inuse > 0) {

		ext2fs_mark_block_bitmap_range2(fs->block_map, blk, num);

		inuse = 1;

	} else {

		ext2fs_unmark_block_bitmap_range2(fs->block_map, blk, num);

		inuse = -1;

	}

	while (num) {

		int group = ext2fs_group_of_blk2(fs, blk);

		blk64_t last_blk = ext2fs_group_last_block2(fs, group);

		blk64_t n = num;

		if (blk + num > last_blk)

			n = last_blk - blk + 1;

		ext2fs_bg_free_blocks_count_set(fs, group,

			ext2fs_bg_free_blocks_count(fs, group) -

			inuse*n/EXT2FS_CLUSTER_RATIO(fs));

		ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);

		ext2fs_group_desc_csum_set(fs, group);

		ext2fs_free_blocks_count_add(fs->super, -inuse * (blk64_t) n);

		blk += n;

		num -= n;

	}

	ext2fs_mark_super_dirty(fs);

	ext2fs_mark_bb_dirty(fs);

	if (fs->block_alloc_stats_range)

		(fs->block_alloc_stats_range)(fs, blk, num, inuse);

}

void ext2fs_set_block_alloc_stats_range_callback(ext2_filsys fs,

	void (*func)(ext2_filsys fs, blk64_t blk,

				    blk_t num, int inuse),

	void (**old)(ext2_filsys fs, blk64_t blk,

				    blk_t num, int inuse))

{

	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)

		return;

	if (old)

		*old = fs->block_alloc_stats_range;

	fs->block_alloc_stats_range = func;

}