lib/ext2fs/alloc_stats.c

   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 "config.h"
  13 #include <stdio.h>
  14
  15 #include "ext2_fs.h"
  16 #include "ext2fs.h"
  17
  18 void 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 (ext2fs_has_group_desc_csum(fs)) {
  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
  56 void 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
  61 void 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
  88 void ext2fs_block_alloc_stats(ext2_filsys fs, blk_t blk, int inuse)
  89 {
  90         ext2fs_block_alloc_stats2(fs, blk, inuse);
  91 }
  92
  93 void 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 }