alloc_stats.c revision d7cca6b06f366f998ed43346f9b6fca9e163692f 
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 Public
8 * License.
9 * %End-Header%
10 *
11 */
12
13#include <stdio.h>
14
15#include "ext2_fs.h"
16#include "ext2fs.h"
17
18void ext2fs_inode_alloc_stats2(ext2_filsys fs, ext2_ino_t ino,
19			       int inuse, int isdir)
20{
21	int	group = ext2fs_group_of_ino(fs, ino);
22
23#ifndef OMIT_COM_ERR
24	if (ino > fs->super->s_inodes_count) {
25		com_err("ext2fs_inode_alloc_stats2", 0,
26			"Illegal inode number: %lu", (unsigned long) ino);
27		return;
28	}
29#endif
30	if (inuse > 0)
31		ext2fs_mark_inode_bitmap2(fs->inode_map, ino);
32	else
33		ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
34	ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) - inuse);
35	if (isdir)
36		ext2fs_bg_used_dirs_count_set(fs, group, ext2fs_bg_used_dirs_count(fs, group) + inuse);
37
38	/* We don't strictly need to be clearing the uninit flag if inuse < 0
39	 * (i.e. freeing inodes) but it also means something is bad. */
40	ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
41	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
42				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
43		ext2_ino_t first_unused_inode =	fs->super->s_inodes_per_group -
44			ext2fs_bg_itable_unused(fs, group) +
45			group * fs->super->s_inodes_per_group + 1;
46
47		if (ino >= first_unused_inode)
48			ext2fs_bg_itable_unused_set(fs, group, group * fs->super->s_inodes_per_group + fs->super->s_inodes_per_group - ino);
49		ext2fs_group_desc_csum_set(fs, group);
50	}
51
52	fs->super->s_free_inodes_count -= inuse;
53	ext2fs_mark_super_dirty(fs);
54	ext2fs_mark_ib_dirty(fs);
55}
56
57void ext2fs_inode_alloc_stats(ext2_filsys fs, ext2_ino_t ino, int inuse)
58{
59	ext2fs_inode_alloc_stats2(fs, ino, inuse, 0);
60}
61
62void ext2fs_block_alloc_stats2(ext2_filsys fs, blk64_t blk, int inuse)
63{
64	int	group = ext2fs_group_of_blk2(fs, blk);
65
66#ifndef OMIT_COM_ERR
67	if (blk >= ext2fs_blocks_count(fs->super)) {
68		com_err("ext2fs_block_alloc_stats", 0,
69			"Illegal block number: %lu", (unsigned long) blk);
70		return;
71	}
72#endif
73	if (inuse > 0)
74		ext2fs_mark_block_bitmap2(fs->block_map, blk);
75	else
76		ext2fs_unmark_block_bitmap2(fs->block_map, blk);
77	ext2fs_bg_free_blocks_count_set(fs, group, ext2fs_bg_free_blocks_count(fs, group) - inuse);
78	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
79	ext2fs_group_desc_csum_set(fs, group);
80
81	ext2fs_free_blocks_count_add(fs->super, -inuse);
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