fs/ext4/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 "ext2_fs.h"
  13 #include "ext2fs.h"
  14
  15 void ext2fs_inode_alloc_stats2(ext2_filsys fs, ext2_ino_t ino,
  16                                int inuse, int isdir)
  17 {
  18         int     group = ext2fs_group_of_ino(fs, ino);
  19
  20 #ifndef OMIT_COM_ERR
  21         if (ino > fs->super->s_inodes_count) {
  22                 printf("ext2fs_inode_alloc_stats2 Illegal inode number: %lu", (unsigned long) ino);
  23                 return;
  24         }
  25 #endif
  26         if (inuse > 0)
  27                 ext2fs_mark_inode_bitmap(fs->inode_map, ino);
  28         else
  29                 ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
  30         fs->group_desc[group].bg_free_inodes_count -= inuse;
  31         if (isdir)
  32                 fs->group_desc[group].bg_used_dirs_count += inuse;
  33
  34         /* We don't strictly need to be clearing the uninit flag if inuse < 0
  35          * (i.e. freeing inodes) but it also means something is bad. */
  36         fs->group_desc[group].bg_flags &= ~EXT2_BG_INODE_UNINIT;
  37         if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
  38                                        EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
  39                 ext2_ino_t first_unused_inode = fs->super->s_inodes_per_group -
  40                         fs->group_desc[group].bg_itable_unused +
  41                         group * fs->super->s_inodes_per_group + 1;
  42
  43                 if (ino >= first_unused_inode)
  44                         fs->group_desc[group].bg_itable_unused =
  45                                 group * fs->super->s_inodes_per_group +
  46                                 fs->super->s_inodes_per_group - ino;
  47                 ext2fs_group_desc_csum_set(fs, group);
  48         }
  49
  50         fs->super->s_free_inodes_count -= inuse;
  51         ext2fs_mark_super_dirty(fs);
  52         ext2fs_mark_ib_dirty(fs);
  53 }
  54
  55 void ext2fs_inode_alloc_stats(ext2_filsys fs, ext2_ino_t ino, int inuse)
  56 {
  57         ext2fs_inode_alloc_stats2(fs, ino, inuse, 0);
  58 }
  59
  60 void ext2fs_block_alloc_stats(ext2_filsys fs, blk_t blk, int inuse)
  61 {
  62         int     group = ext2fs_group_of_blk(fs, blk);
  63
  64 #ifndef OMIT_COM_ERR
  65         if (blk >= fs->super->s_blocks_count) {
  66                 printf("ext2fs_block_alloc_stats Illegal block number: %lu", (unsigned long) blk);
  67                 return;
  68         }
  69 #endif
  70         if (inuse > 0)
  71                 ext2fs_mark_block_bitmap(fs->block_map, blk);
  72         else
  73                 ext2fs_unmark_block_bitmap(fs->block_map, blk);
  74         fs->group_desc[group].bg_free_blocks_count -= inuse;
  75         fs->group_desc[group].bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
  76         ext2fs_group_desc_csum_set(fs, group);
  77
  78         fs->super->s_free_blocks_count -= inuse;
  79         ext2fs_mark_super_dirty(fs);
  80         ext2fs_mark_bb_dirty(fs);
  81         if (fs->block_alloc_stats)
  82                 (fs->block_alloc_stats)(fs, (blk64_t) blk, inuse);
  83 }
  84
  85 void ext2fs_set_block_alloc_stats_callback(ext2_filsys fs,
  86                                            void (*func)(ext2_filsys fs,
  87                                                         blk64_t blk,
  88                                                         int inuse),
  89                                            void (**old)(ext2_filsys fs,
  90                                                         blk64_t blk,
  91                                                         int inuse))
  92 {
  93         if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
  94                 return;
  95         if (old)
  96                 *old = fs->block_alloc_stats;
  97
  98         fs->block_alloc_stats = func;
  99 }