e2fsprogs/lib/ext2fs/bitmaps.c - backupdr - Git at Google

 /*
  * bitmaps.c --- routines to read, write, and manipulate the inode and
  * block bitmaps.
  *
  * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
  *
  * %Begin-Header%
  * This file may be redistributed under the terms of the GNU Library
  * General Public License, version 2.
  * %End-Header%
  */

 #include "config.h"
 #include <stdio.h>
 #include <string.h>
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <fcntl.h>
 #include <time.h>
 #if HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif

 #include "ext2_fs.h"
 #include "ext2fs.h"
 #include "ext2fsP.h"
 #include "bmap64.h"

 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
 {
 	ext2fs_free_generic_bmap(bitmap);
 }

 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
 {
 	ext2fs_free_generic_bmap(bitmap);
 }

 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
 			     ext2fs_generic_bitmap *dest)
 {
 	return (ext2fs_copy_generic_bmap(src, dest));
 }
 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
 {
 	ext2fs_set_generic_bmap_padding(map);
 }

 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
 				       const char *descr,
 				       ext2fs_inode_bitmap *ret)
 {
 	__u64		start, end, real_end;

 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

 	fs->write_bitmaps = ext2fs_write_bitmaps;

 	start = 1;
 	end = fs->super->s_inodes_count;
 	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);

 	/* Are we permitted to use new-style bitmaps? */
 	if (fs->flags & EXT2_FLAG_64BITS)
 		return (ext2fs_alloc_generic_bmap(fs,
 				EXT2_ET_MAGIC_INODE_BITMAP64,
 				fs->default_bitmap_type,
 				start, end, real_end, descr, ret));

 	/* Otherwise, check to see if the file system is small enough
 	 * to use old-style 32-bit bitmaps */
 	if ((end > ~0U) || (real_end > ~0U))
 		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

 	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
 					 start, end, real_end,
 					 descr, 0,
 					 (ext2fs_generic_bitmap *) ret));
 }

 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
 				       const char *descr,
 				       ext2fs_block_bitmap *ret)
 {
 	__u64		start, end, real_end;

 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

 	fs->write_bitmaps = ext2fs_write_bitmaps;

 	start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
 	end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
 	real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
 		    * (__u64) fs->group_desc_count)-1 + start;

 	if (fs->flags & EXT2_FLAG_64BITS)
 		return (ext2fs_alloc_generic_bmap(fs,
 				EXT2_ET_MAGIC_BLOCK_BITMAP64,
 				fs->default_bitmap_type,
 				start, end, real_end, descr, ret));

 	if ((end > ~0U) || (real_end > ~0U))
 		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

 	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
 					   start, end, real_end,
 					   descr, 0,
 					   (ext2fs_generic_bitmap *) ret));
 }

 /*
  * ext2fs_allocate_block_bitmap() really allocates a per-cluster
  * bitmap for backwards compatibility.  This function allocates a
  * block bitmap which is truly per-block, even if clusters/bigalloc
  * are enabled.  mke2fs and e2fsck need this for tracking the
  * allocation of the file system metadata blocks.
  */
 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
 					    const char *descr,
 					    ext2fs_block_bitmap *ret)
 {
 	__u64			start, end, real_end;
 	ext2fs_generic_bitmap	bmap;
 	errcode_t		retval;

 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

 	fs->write_bitmaps = ext2fs_write_bitmaps;

 	if (!fs->cluster_ratio_bits)
 		return ext2fs_allocate_block_bitmap(fs, descr, ret);

 	if ((fs->flags & EXT2_FLAG_64BITS) == 0)
 		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

 	start = fs->super->s_first_data_block;
 	end = ext2fs_blocks_count(fs->super)-1;
 	real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
 		    * (__u64) fs->group_desc_count)-1 + start;

 	retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
 					   fs->default_bitmap_type, start,
 					   end, real_end, descr, &bmap);
 	if (retval)
 		return retval;
 	bmap->cluster_bits = 0;
 	*ret = bmap;
 	return 0;
 }

 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
 {
 	ext2fs_generic_bitmap bmap = bitmap;

 	if (!EXT2FS_IS_64_BITMAP(bmap))
 		return 0;

 	return bmap->cluster_bits;
 }

 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 					ext2_ino_t end, ext2_ino_t *oend)
 {
 	__u64 tmp_oend;
 	int retval;

 	retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 					       EXT2_ET_FUDGE_INODE_BITMAP_END,
 					       end, &tmp_oend);
 	if (oend)
 		*oend = tmp_oend;
 	return retval;
 }

 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 					blk_t end, blk_t *oend)
 {
 	return (ext2fs_fudge_generic_bitmap_end(bitmap,
 						EXT2_ET_MAGIC_BLOCK_BITMAP,
 						EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 						end, oend));
 }

 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 					 blk64_t end, blk64_t *oend)
 {
 	return (ext2fs_fudge_generic_bmap_end(bitmap,
 					      EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 					      end, oend));
 }

 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 {
 	ext2fs_clear_generic_bmap(bitmap);
 }

 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 {
 	ext2fs_clear_generic_bmap(bitmap);
 }

 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 				     ext2fs_inode_bitmap bmap)
 {
 	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 					     new_end, new_real_end, bmap));
 }

 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 				      ext2fs_inode_bitmap bmap)
 {
 	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 }

 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 				     ext2fs_block_bitmap bmap)
 {
 	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 					     new_end, new_real_end, bmap));
 }

 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 				      ext2fs_block_bitmap bmap)
 {
 	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 }

 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 				      ext2fs_block_bitmap bm2)
 {
 	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 					    bm1, bm2));
 }

 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 				      ext2fs_inode_bitmap bm2)
 {
 	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 					    bm1, bm2));
 }

 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 					ext2_ino_t start, unsigned int num,
 					void *in)
 {
 	return (ext2fs_set_generic_bitmap_range(bmap,
 						EXT2_ET_MAGIC_INODE_BITMAP,
 						start, num, in));
 }

 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 					 __u64 start, size_t num,
 					 void *in)
 {
 	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 }

 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 					ext2_ino_t start, unsigned int num,
 					void *out)
 {
 	return (ext2fs_get_generic_bitmap_range(bmap,
 						EXT2_ET_MAGIC_INODE_BITMAP,
 						start, num, out));
 }

 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 					 __u64 start, size_t num,
 					 void *out)
 {
 	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 }

 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 					blk_t start, unsigned int num,
 					void *in)
 {
 	return (ext2fs_set_generic_bitmap_range(bmap,
 						EXT2_ET_MAGIC_BLOCK_BITMAP,
 						start, num, in));
 }

 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 					 blk64_t start, size_t num,
 					 void *in)
 {
 	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 }

 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 					blk_t start, unsigned int num,
 					void *out)
 {
 	return (ext2fs_get_generic_bitmap_range(bmap,
 						EXT2_ET_MAGIC_BLOCK_BITMAP,
 						start, num, out));
 }

 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 					 blk64_t start, size_t num,
 					 void *out)
 {
 	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 }
	/*
	* bitmaps.c --- routines to read, write, and manipulate the inode and
	* block bitmaps.
	*
	* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
	*
	* %Begin-Header%
	* This file may be redistributed under the terms of the GNU Library
	* General Public License, version 2.
	* %End-Header%
	*/

	#include "config.h"
	#include <stdio.h>
	#include <string.h>
	#if HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#include <fcntl.h>
	#include <time.h>
	#if HAVE_SYS_STAT_H
	#include <sys/stat.h>
	#endif
	#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif

	#include "ext2_fs.h"
	#include "ext2fs.h"
	#include "ext2fsP.h"
	#include "bmap64.h"

	void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
	{
	ext2fs_free_generic_bmap(bitmap);
	}

	void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
	{
	ext2fs_free_generic_bmap(bitmap);
	}

	errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
	ext2fs_generic_bitmap *dest)
	{
	return (ext2fs_copy_generic_bmap(src, dest));
	}
	void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
	{
	ext2fs_set_generic_bmap_padding(map);
	}

	errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
	const char *descr,
	ext2fs_inode_bitmap *ret)
	{
	__u64 start, end, real_end;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	start = 1;
	end = fs->super->s_inodes_count;
	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);

	/* Are we permitted to use new-style bitmaps? */
	if (fs->flags & EXT2_FLAG_64BITS)
	return (ext2fs_alloc_generic_bmap(fs,
	EXT2_ET_MAGIC_INODE_BITMAP64,
	fs->default_bitmap_type,
	start, end, real_end, descr, ret));

	/* Otherwise, check to see if the file system is small enough
	* to use old-style 32-bit bitmaps */
	if ((end > ~0U) \|\| (real_end > ~0U))
	return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
	start, end, real_end,
	descr, 0,
	(ext2fs_generic_bitmap *) ret));
	}

	errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
	const char *descr,
	ext2fs_block_bitmap *ret)
	{
	__u64 start, end, real_end;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
	end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
	real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
	* (__u64) fs->group_desc_count)-1 + start;

	if (fs->flags & EXT2_FLAG_64BITS)
	return (ext2fs_alloc_generic_bmap(fs,
	EXT2_ET_MAGIC_BLOCK_BITMAP64,
	fs->default_bitmap_type,
	start, end, real_end, descr, ret));

	if ((end > ~0U) \|\| (real_end > ~0U))
	return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
	start, end, real_end,
	descr, 0,
	(ext2fs_generic_bitmap *) ret));
	}

	/*
	* ext2fs_allocate_block_bitmap() really allocates a per-cluster
	* bitmap for backwards compatibility. This function allocates a
	* block bitmap which is truly per-block, even if clusters/bigalloc
	* are enabled. mke2fs and e2fsck need this for tracking the
	* allocation of the file system metadata blocks.
	*/
	errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
	const char *descr,
	ext2fs_block_bitmap *ret)
	{
	__u64 start, end, real_end;
	ext2fs_generic_bitmap bmap;
	errcode_t retval;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	if (!fs->cluster_ratio_bits)
	return ext2fs_allocate_block_bitmap(fs, descr, ret);

	if ((fs->flags & EXT2_FLAG_64BITS) == 0)
	return EXT2_ET_CANT_USE_LEGACY_BITMAPS;

	start = fs->super->s_first_data_block;
	end = ext2fs_blocks_count(fs->super)-1;
	real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
	* (__u64) fs->group_desc_count)-1 + start;

	retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
	fs->default_bitmap_type, start,
	end, real_end, descr, &bmap);
	if (retval)
	return retval;
	bmap->cluster_bits = 0;
	*ret = bmap;
	return 0;
	}

	int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
	{
	ext2fs_generic_bitmap bmap = bitmap;

	if (!EXT2FS_IS_64_BITMAP(bmap))
	return 0;

	return bmap->cluster_bits;
	}

	errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
	ext2_ino_t end, ext2_ino_t *oend)
	{
	__u64 tmp_oend;
	int retval;

	retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
	EXT2_ET_FUDGE_INODE_BITMAP_END,
	end, &tmp_oend);
	if (oend)
	*oend = tmp_oend;
	return retval;
	}

	errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
	blk_t end, blk_t *oend)
	{
	return (ext2fs_fudge_generic_bitmap_end(bitmap,
	EXT2_ET_MAGIC_BLOCK_BITMAP,
	EXT2_ET_FUDGE_BLOCK_BITMAP_END,
	end, oend));
	}

	errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
	blk64_t end, blk64_t *oend)
	{
	return (ext2fs_fudge_generic_bmap_end(bitmap,
	EXT2_ET_FUDGE_BLOCK_BITMAP_END,
	end, oend));
	}

	void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
	{
	ext2fs_clear_generic_bmap(bitmap);
	}

	void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
	{
	ext2fs_clear_generic_bmap(bitmap);
	}

	errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
	ext2fs_inode_bitmap bmap)
	{
	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
	new_end, new_real_end, bmap));
	}

	errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
	ext2fs_inode_bitmap bmap)
	{
	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
	}

	errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
	ext2fs_block_bitmap bmap)
	{
	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
	new_end, new_real_end, bmap));
	}

	errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
	ext2fs_block_bitmap bmap)
	{
	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
	}

	errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
	ext2fs_block_bitmap bm2)
	{
	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
	bm1, bm2));
	}

	errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
	ext2fs_inode_bitmap bm2)
	{
	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
	bm1, bm2));
	}

	errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
	ext2_ino_t start, unsigned int num,
	void *in)
	{
	return (ext2fs_set_generic_bitmap_range(bmap,
	EXT2_ET_MAGIC_INODE_BITMAP,
	start, num, in));
	}

	errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
	__u64 start, size_t num,
	void *in)
	{
	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
	}

	errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
	ext2_ino_t start, unsigned int num,
	void *out)
	{
	return (ext2fs_get_generic_bitmap_range(bmap,
	EXT2_ET_MAGIC_INODE_BITMAP,
	start, num, out));
	}

	errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
	__u64 start, size_t num,
	void *out)
	{
	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
	}

	errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
	blk_t start, unsigned int num,
	void *in)
	{
	return (ext2fs_set_generic_bitmap_range(bmap,
	EXT2_ET_MAGIC_BLOCK_BITMAP,
	start, num, in));
	}

	errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
	blk64_t start, size_t num,
	void *in)
	{
	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
	}

	errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
	blk_t start, unsigned int num,
	void *out)
	{
	return (ext2fs_get_generic_bitmap_range(bmap,
	EXT2_ET_MAGIC_BLOCK_BITMAP,
	start, num, out));
	}

	errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
	blk64_t start, size_t num,
	void *out)
	{
	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
	}