/*
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* i_block.c --- Manage the i_block field for i_blocks
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*
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* Copyright (C) 2008 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <time.h>
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#include <string.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <errno.h>
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#include "ext2_fs.h"
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#include "ext2fs.h"
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errcode_t ext2fs_iblk_add_blocks(ext2_filsys fs, struct ext2_inode *inode,
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blk64_t num_blocks)
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{
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unsigned long long b = inode->i_blocks;
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if (ext2fs_has_feature_huge_file(fs->super))
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b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
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if (!ext2fs_has_feature_huge_file(fs->super) ||
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!(inode->i_flags & EXT4_HUGE_FILE_FL))
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num_blocks *= fs->blocksize / 512;
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num_blocks *= EXT2FS_CLUSTER_RATIO(fs);
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b += num_blocks;
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if (ext2fs_has_feature_huge_file(fs->super))
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inode->osd2.linux2.l_i_blocks_hi = b >> 32;
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else if (b > 0xFFFFFFFF)
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return EOVERFLOW;
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inode->i_blocks = b & 0xFFFFFFFF;
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return 0;
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}
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errcode_t ext2fs_iblk_sub_blocks(ext2_filsys fs, struct ext2_inode *inode,
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blk64_t num_blocks)
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{
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unsigned long long b = inode->i_blocks;
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if (ext2fs_has_feature_huge_file(fs->super))
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b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
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if (!ext2fs_has_feature_huge_file(fs->super) ||
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!(inode->i_flags & EXT4_HUGE_FILE_FL))
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num_blocks *= fs->blocksize / 512;
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num_blocks *= EXT2FS_CLUSTER_RATIO(fs);
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if (num_blocks > b)
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return EOVERFLOW;
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b -= num_blocks;
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if (ext2fs_has_feature_huge_file(fs->super))
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inode->osd2.linux2.l_i_blocks_hi = b >> 32;
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inode->i_blocks = b & 0xFFFFFFFF;
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return 0;
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}
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errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b)
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{
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if (!ext2fs_has_feature_huge_file(fs->super) ||
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!(inode->i_flags & EXT4_HUGE_FILE_FL))
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b *= fs->blocksize / 512;
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b *= EXT2FS_CLUSTER_RATIO(fs);
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inode->i_blocks = b & 0xFFFFFFFF;
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if (ext2fs_has_feature_huge_file(fs->super))
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inode->osd2.linux2.l_i_blocks_hi = b >> 32;
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else if (b >> 32)
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return EOVERFLOW;
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return 0;
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}
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