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478 lines
12 KiB
C
478 lines
12 KiB
C
/*
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* blknum.c --- Functions to handle blk64_t and high/low 64-bit block
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* number.
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*
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* Copyright IBM Corporation, 2007
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* Author Jose R. Santos <jrs@us.ibm.com>
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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 Public
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* License.
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* %End-Header%
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*/
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#include "ext2fs.h"
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/*
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* Return the group # of a block
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*/
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dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t blk)
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{
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return (blk - fs->super->s_first_data_block) /
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fs->super->s_blocks_per_group;
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}
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/*
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* Return the first block (inclusive) in a group
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*/
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blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group)
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{
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return fs->super->s_first_data_block +
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((blk64_t)group * fs->super->s_blocks_per_group);
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}
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/*
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* Return the last block (inclusive) in a group
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*/
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blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group)
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{
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return (group == fs->group_desc_count - 1 ?
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ext2fs_blocks_count(fs->super) - 1 :
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ext2fs_group_first_block2(fs, group) +
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(fs->super->s_blocks_per_group - 1));
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}
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/*
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* Return the inode data block count
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*/
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blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
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struct ext2_inode *inode)
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{
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return (inode->i_blocks |
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((fs->super->s_feature_ro_compat &
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ?
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(__u64) inode->osd2.linux2.l_i_blocks_hi << 32 : 0)) -
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(inode->i_file_acl ? fs->blocksize >> 9 : 0);
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}
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/*
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* Return the inode i_blocks count
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*/
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blk64_t ext2fs_inode_i_blocks(ext2_filsys fs,
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struct ext2_inode *inode)
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{
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return (inode->i_blocks |
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((fs->super->s_feature_ro_compat &
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ?
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(__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0));
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}
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/*
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* Return the fs block count
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*/
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blk64_t ext2fs_blocks_count(struct ext2_super_block *super)
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{
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return super->s_blocks_count |
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(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64) super->s_blocks_count_hi << 32 : 0);
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}
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/*
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* Set the fs block count
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*/
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void ext2fs_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
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{
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super->s_blocks_count = blk;
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if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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super->s_blocks_count_hi = (__u64) blk >> 32;
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}
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/*
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* Add to the current fs block count
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*/
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void ext2fs_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
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{
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blk64_t tmp;
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tmp = ext2fs_blocks_count(super) + blk;
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ext2fs_blocks_count_set(super, tmp);
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}
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/*
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* Return the fs reserved block count
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*/
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blk64_t ext2fs_r_blocks_count(struct ext2_super_block *super)
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{
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return super->s_r_blocks_count |
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(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64) super->s_r_blocks_count_hi << 32 : 0);
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}
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/*
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* Set the fs reserved block count
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*/
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void ext2fs_r_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
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{
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super->s_r_blocks_count = blk;
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if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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super->s_r_blocks_count_hi = (__u64) blk >> 32;
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}
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/*
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* Add to the current reserved fs block count
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*/
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void ext2fs_r_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
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{
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blk64_t tmp;
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tmp = ext2fs_r_blocks_count(super) + blk;
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ext2fs_r_blocks_count_set(super, tmp);
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}
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/*
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* Return the fs free block count
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*/
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blk64_t ext2fs_free_blocks_count(struct ext2_super_block *super)
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{
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return super->s_free_blocks_count |
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(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64) super->s_free_blocks_hi << 32 : 0);
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}
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/*
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* Set the fs free block count
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*/
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void ext2fs_free_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
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{
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super->s_free_blocks_count = blk;
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if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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super->s_free_blocks_hi = (__u64) blk >> 32;
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}
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/*
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* Add to the current free fs block count
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*/
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void ext2fs_free_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
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{
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blk64_t tmp;
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tmp = ext2fs_free_blocks_count(super) + blk;
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ext2fs_free_blocks_count_set(super, tmp);
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}
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/*
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* Get a pointer to a block group descriptor. We need the explicit
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* pointer to the group desc for code that swaps block group
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* descriptors before writing them out, as it wants to make a copy and
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* do the swap there.
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*/
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struct ext2_group_desc *ext2fs_group_desc(ext2_filsys fs,
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struct opaque_ext2_group_desc *gdp,
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dgrp_t group)
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{
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if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT)
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return (struct ext2_group_desc *)
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((struct ext4_group_desc *) gdp + group);
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else
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return (struct ext2_group_desc *) gdp + group;
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}
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/* Do the same but as an ext4 group desc for internal use here */
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static struct ext4_group_desc *ext4fs_group_desc(ext2_filsys fs,
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struct opaque_ext2_group_desc *gdp,
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dgrp_t group)
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{
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return (struct ext4_group_desc *)ext2fs_group_desc(fs, gdp, group);
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}
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/*
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* Return the block bitmap block of a group
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*/
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blk64_t ext2fs_block_bitmap_loc(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_block_bitmap |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64)gdp->bg_block_bitmap_hi << 32 : 0);
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}
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/*
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* Set the block bitmap block of a group
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*/
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void ext2fs_block_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_block_bitmap = blk;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_block_bitmap_hi = (__u64) blk >> 32;
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}
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/*
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* Return the inode bitmap block of a group
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*/
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blk64_t ext2fs_inode_bitmap_loc(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_inode_bitmap |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64) gdp->bg_inode_bitmap_hi << 32 : 0);
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}
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/*
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* Set the inode bitmap block of a group
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*/
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void ext2fs_inode_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_inode_bitmap = blk;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_inode_bitmap_hi = (__u64) blk >> 32;
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}
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/*
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* Return the inode table block of a group
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*/
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blk64_t ext2fs_inode_table_loc(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_inode_table |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u64) gdp->bg_inode_table_hi << 32 : 0);
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}
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/*
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* Set the inode table block of a group
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*/
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void ext2fs_inode_table_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_inode_table = blk;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_inode_table_hi = (__u64) blk >> 32;
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}
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/*
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* Return the free blocks count of a group
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*/
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__u32 ext2fs_bg_free_blocks_count(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_free_blocks_count |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u32) gdp->bg_free_blocks_count_hi << 16 : 0);
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}
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/*
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* Set the free blocks count of a group
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*/
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void ext2fs_bg_free_blocks_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_free_blocks_count = n;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_free_blocks_count_hi = (__u32) n >> 16;
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}
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/*
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* Return the free inodes count of a group
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*/
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__u32 ext2fs_bg_free_inodes_count(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_free_inodes_count |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u32) gdp->bg_free_inodes_count_hi << 16 : 0);
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}
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/*
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* Set the free inodes count of a group
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*/
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void ext2fs_bg_free_inodes_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_free_inodes_count = n;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_free_inodes_count_hi = (__u32) n >> 16;
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}
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/*
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* Return the used dirs count of a group
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*/
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__u32 ext2fs_bg_used_dirs_count(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_used_dirs_count |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u32) gdp->bg_used_dirs_count_hi << 16 : 0);
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}
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/*
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* Set the used dirs count of a group
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*/
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void ext2fs_bg_used_dirs_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_used_dirs_count = n;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_used_dirs_count_hi = (__u32) n >> 16;
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}
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/*
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* Return the unused inodes count of a group
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*/
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__u32 ext2fs_bg_itable_unused(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_itable_unused |
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(fs->super->s_feature_incompat
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& EXT4_FEATURE_INCOMPAT_64BIT ?
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(__u32) gdp->bg_itable_unused_hi << 16 : 0);
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}
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/*
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* Set the unused inodes count of a group
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*/
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void ext2fs_bg_itable_unused_set(ext2_filsys fs, dgrp_t group, __u32 n)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_itable_unused = n;
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if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
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gdp->bg_itable_unused_hi = (__u32) n >> 16;
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}
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/*
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* Get the flags for this block group
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*/
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__u16 ext2fs_bg_flags(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_flags;
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}
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/*
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* Zero out the flags for this block group
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*/
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void ext2fs_bg_flags_zap(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_flags = 0;
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return;
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}
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/*
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* Get the value of a particular flag for this block group
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*/
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int ext2fs_bg_flags_test(ext2_filsys fs, dgrp_t group, __u16 bg_flag)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_flags & bg_flag;
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}
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/*
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* Set a flag or set of flags for this block group
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*/
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void ext2fs_bg_flags_set(ext2_filsys fs, dgrp_t group, __u16 bg_flags)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_flags |= bg_flags;
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return;
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}
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/*
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* Clear a flag or set of flags for this block group
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*/
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void ext2fs_bg_flags_clear(ext2_filsys fs, dgrp_t group, __u16 bg_flags)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_flags &= ~bg_flags;
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return;
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}
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/*
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* Get the checksum for this block group
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*/
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__u16 ext2fs_bg_checksum(ext2_filsys fs, dgrp_t group)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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return gdp->bg_checksum;
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}
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/*
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* Set the checksum for this block group to a previously calculated value
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*/
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void ext2fs_bg_checksum_set(ext2_filsys fs, dgrp_t group, __u16 checksum)
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{
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struct ext4_group_desc *gdp;
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gdp = ext4fs_group_desc(fs, fs->group_desc, group);
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gdp->bg_checksum = checksum;
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return;
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}
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/*
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* Get the acl block of a file
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*
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* XXX Ignoring 64-bit file system flag - most places where this is
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* called don't have access to the fs struct, and the high bits should
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* be 0 in the non-64-bit case anyway.
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*/
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blk64_t ext2fs_file_acl_block(const struct ext2_inode *inode)
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{
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return (inode->i_file_acl |
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(__u64) inode->osd2.linux2.l_i_file_acl_high << 32);
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}
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/*
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* Set the acl block of a file
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*/
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void ext2fs_file_acl_block_set(struct ext2_inode *inode, blk64_t blk)
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{
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inode->i_file_acl = blk;
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inode->osd2.linux2.l_i_file_acl_high = (__u64) blk >> 32;
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}
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