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      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 
     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_bitmap(fs->inode_map, ino);
     32 	else
     33 		ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
     34 	fs->group_desc[group].bg_free_inodes_count -= inuse;
     35 	if (isdir)
     36 		fs->group_desc[group].bg_used_dirs_count += 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 	fs->group_desc[group].bg_flags &= ~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 			fs->group_desc[group].bg_itable_unused +
     45 			group * fs->super->s_inodes_per_group + 1;
     46 
     47 		if (ino >= first_unused_inode)
     48 			fs->group_desc[group].bg_itable_unused =
     49 				group * fs->super->s_inodes_per_group +
     50 				fs->super->s_inodes_per_group - ino;
     51 		ext2fs_group_desc_csum_set(fs, group);
     52 	}
     53 
     54 	fs->super->s_free_inodes_count -= inuse;
     55 	ext2fs_mark_super_dirty(fs);
     56 	ext2fs_mark_ib_dirty(fs);
     57 }
     58 
     59 void ext2fs_inode_alloc_stats(ext2_filsys fs, ext2_ino_t ino, int inuse)
     60 {
     61 	ext2fs_inode_alloc_stats2(fs, ino, inuse, 0);
     62 }
     63 
     64 void ext2fs_block_alloc_stats(ext2_filsys fs, blk_t blk, int inuse)
     65 {
     66 	int	group = ext2fs_group_of_blk(fs, blk);
     67 
     68 #ifndef OMIT_COM_ERR
     69 	if (blk >= fs->super->s_blocks_count) {
     70 		com_err("ext2fs_block_alloc_stats", 0,
     71 			"Illegal block number: %lu", (unsigned long) blk);
     72 		return;
     73 	}
     74 #endif
     75 	if (inuse > 0)
     76 		ext2fs_mark_block_bitmap(fs->block_map, blk);
     77 	else
     78 		ext2fs_unmark_block_bitmap(fs->block_map, blk);
     79 	fs->group_desc[group].bg_free_blocks_count -= inuse;
     80 	fs->group_desc[group].bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
     81 	ext2fs_group_desc_csum_set(fs, group);
     82 
     83 	fs->super->s_free_blocks_count -= inuse;
     84 	ext2fs_mark_super_dirty(fs);
     85 	ext2fs_mark_bb_dirty(fs);
     86 	if (fs->block_alloc_stats)
     87 		(fs->block_alloc_stats)(fs, (blk64_t) blk, inuse);
     88 }
     89 
     90 void ext2fs_set_block_alloc_stats_callback(ext2_filsys fs,
     91 					   void (*func)(ext2_filsys fs,
     92 							blk64_t blk,
     93 							int inuse),
     94 					   void (**old)(ext2_filsys fs,
     95 							blk64_t blk,
     96 							int inuse))
     97 {
     98 	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
     99 		return;
    100 	if (old)
    101 		*old = fs->block_alloc_stats;
    102 
    103 	fs->block_alloc_stats = func;
    104 }
    105