1/*
2 * alloc_stats.c --- Update allocation statistics for ext2fs
3 *
4 * Copyright (C) 2001 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13
14#include "ext2_fs.h"
15#include "ext2fs.h"
16
17void ext2fs_inode_alloc_stats2(ext2_filsys fs, ext2_ino_t ino,
18			       int inuse, int isdir)
19{
20	int	group = ext2fs_group_of_ino(fs, ino);
21
22#ifndef OMIT_COM_ERR
23	if (ino > fs->super->s_inodes_count) {
24		com_err("ext2fs_inode_alloc_stats2", 0,
25			"Illegal inode number: %lu", (unsigned long) ino);
26		return;
27	}
28#endif
29	if (inuse > 0)
30		ext2fs_mark_inode_bitmap2(fs->inode_map, ino);
31	else
32		ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
33	ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) - inuse);
34	if (isdir)
35		ext2fs_bg_used_dirs_count_set(fs, group, ext2fs_bg_used_dirs_count(fs, group) + inuse);
36
37	/* We don't strictly need to be clearing the uninit flag if inuse < 0
38	 * (i.e. freeing inodes) but it also means something is bad. */
39	ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
40	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
41				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
42		ext2_ino_t first_unused_inode =	fs->super->s_inodes_per_group -
43			ext2fs_bg_itable_unused(fs, group) +
44			group * fs->super->s_inodes_per_group + 1;
45
46		if (ino >= first_unused_inode)
47			ext2fs_bg_itable_unused_set(fs, group, group * fs->super->s_inodes_per_group + fs->super->s_inodes_per_group - ino);
48		ext2fs_group_desc_csum_set(fs, group);
49	}
50
51	fs->super->s_free_inodes_count -= inuse;
52	ext2fs_mark_super_dirty(fs);
53	ext2fs_mark_ib_dirty(fs);
54}
55
56void ext2fs_inode_alloc_stats(ext2_filsys fs, ext2_ino_t ino, int inuse)
57{
58	ext2fs_inode_alloc_stats2(fs, ino, inuse, 0);
59}
60
61void ext2fs_block_alloc_stats2(ext2_filsys fs, blk64_t blk, int inuse)
62{
63	int	group = ext2fs_group_of_blk2(fs, blk);
64
65#ifndef OMIT_COM_ERR
66	if (blk >= ext2fs_blocks_count(fs->super)) {
67		com_err("ext2fs_block_alloc_stats", 0,
68			"Illegal block number: %lu", (unsigned long) blk);
69		return;
70	}
71#endif
72	if (inuse > 0)
73		ext2fs_mark_block_bitmap2(fs->block_map, blk);
74	else
75		ext2fs_unmark_block_bitmap2(fs->block_map, blk);
76	ext2fs_bg_free_blocks_count_set(fs, group, ext2fs_bg_free_blocks_count(fs, group) - inuse);
77	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
78	ext2fs_group_desc_csum_set(fs, group);
79
80	ext2fs_free_blocks_count_add(fs->super,
81				     -inuse * EXT2FS_CLUSTER_RATIO(fs));
82	ext2fs_mark_super_dirty(fs);
83	ext2fs_mark_bb_dirty(fs);
84	if (fs->block_alloc_stats)
85		(fs->block_alloc_stats)(fs, (blk64_t) blk, inuse);
86}
87
88void ext2fs_block_alloc_stats(ext2_filsys fs, blk_t blk, int inuse)
89{
90	ext2fs_block_alloc_stats2(fs, blk, inuse);
91}
92
93void ext2fs_set_block_alloc_stats_callback(ext2_filsys fs,
94					   void (*func)(ext2_filsys fs,
95							blk64_t blk,
96							int inuse),
97					   void (**old)(ext2_filsys fs,
98							blk64_t blk,
99							int inuse))
100{
101	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
102		return;
103	if (old)
104		*old = fs->block_alloc_stats;
105
106	fs->block_alloc_stats = func;
107}
108