mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-16 00:15:08 +01:00
499 lines
12 KiB
C
499 lines
12 KiB
C
/*
|
|
* blknum.c --- Functions to handle blk64_t and high/low 64-bit block
|
|
* number.
|
|
*
|
|
* Copyright IBM Corporation, 2007
|
|
* Author Jose R. Santos <jrs@us.ibm.com>
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "ext2fs.h"
|
|
|
|
/*
|
|
* Return the group # of a block
|
|
*/
|
|
dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t blk)
|
|
{
|
|
return (blk - fs->super->s_first_data_block) /
|
|
fs->super->s_blocks_per_group;
|
|
}
|
|
|
|
/*
|
|
* Return the first block (inclusive) in a group
|
|
*/
|
|
blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
return fs->super->s_first_data_block +
|
|
((blk64_t)group * fs->super->s_blocks_per_group);
|
|
}
|
|
|
|
/*
|
|
* Return the last block (inclusive) in a group
|
|
*/
|
|
blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
return (group == fs->group_desc_count - 1 ?
|
|
ext2fs_blocks_count(fs->super) - 1 :
|
|
ext2fs_group_first_block2(fs, group) +
|
|
(fs->super->s_blocks_per_group - 1));
|
|
}
|
|
|
|
/*
|
|
* Return the number of blocks in a group
|
|
*/
|
|
int ext2fs_group_blocks_count(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
int num_blocks;
|
|
|
|
if (group == fs->group_desc_count - 1) {
|
|
num_blocks = (ext2fs_blocks_count(fs->super) -
|
|
fs->super->s_first_data_block) %
|
|
fs->super->s_blocks_per_group;
|
|
if (!num_blocks)
|
|
num_blocks = fs->super->s_blocks_per_group;
|
|
} else
|
|
num_blocks = fs->super->s_blocks_per_group;
|
|
|
|
return num_blocks;
|
|
}
|
|
|
|
/*
|
|
* Return the inode data block count
|
|
*/
|
|
blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
|
|
struct ext2_inode *inode)
|
|
{
|
|
return (inode->i_blocks |
|
|
((fs->super->s_feature_ro_compat &
|
|
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ?
|
|
(__u64) inode->osd2.linux2.l_i_blocks_hi << 32 : 0)) -
|
|
(inode->i_file_acl ? fs->blocksize >> 9 : 0);
|
|
}
|
|
|
|
/*
|
|
* Return the inode i_blocks count
|
|
*/
|
|
blk64_t ext2fs_inode_i_blocks(ext2_filsys fs,
|
|
struct ext2_inode *inode)
|
|
{
|
|
return (inode->i_blocks |
|
|
((fs->super->s_feature_ro_compat &
|
|
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ?
|
|
(__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0));
|
|
}
|
|
|
|
/*
|
|
* Return the fs block count
|
|
*/
|
|
blk64_t ext2fs_blocks_count(struct ext2_super_block *super)
|
|
{
|
|
return super->s_blocks_count |
|
|
(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64) super->s_blocks_count_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the fs block count
|
|
*/
|
|
void ext2fs_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
super->s_blocks_count = blk;
|
|
if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
super->s_blocks_count_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Add to the current fs block count
|
|
*/
|
|
void ext2fs_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
blk64_t tmp;
|
|
tmp = ext2fs_blocks_count(super) + blk;
|
|
ext2fs_blocks_count_set(super, tmp);
|
|
}
|
|
|
|
/*
|
|
* Return the fs reserved block count
|
|
*/
|
|
blk64_t ext2fs_r_blocks_count(struct ext2_super_block *super)
|
|
{
|
|
return super->s_r_blocks_count |
|
|
(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64) super->s_r_blocks_count_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the fs reserved block count
|
|
*/
|
|
void ext2fs_r_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
super->s_r_blocks_count = blk;
|
|
if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
super->s_r_blocks_count_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Add to the current reserved fs block count
|
|
*/
|
|
void ext2fs_r_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
blk64_t tmp;
|
|
tmp = ext2fs_r_blocks_count(super) + blk;
|
|
ext2fs_r_blocks_count_set(super, tmp);
|
|
}
|
|
|
|
/*
|
|
* Return the fs free block count
|
|
*/
|
|
blk64_t ext2fs_free_blocks_count(struct ext2_super_block *super)
|
|
{
|
|
return super->s_free_blocks_count |
|
|
(super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64) super->s_free_blocks_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the fs free block count
|
|
*/
|
|
void ext2fs_free_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
super->s_free_blocks_count = blk;
|
|
if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
super->s_free_blocks_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Add to the current free fs block count
|
|
*/
|
|
void ext2fs_free_blocks_count_add(struct ext2_super_block *super, blk64_t blk)
|
|
{
|
|
blk64_t tmp;
|
|
tmp = ext2fs_free_blocks_count(super) + blk;
|
|
ext2fs_free_blocks_count_set(super, tmp);
|
|
}
|
|
|
|
/*
|
|
* Get a pointer to a block group descriptor. We need the explicit
|
|
* pointer to the group desc for code that swaps block group
|
|
* descriptors before writing them out, as it wants to make a copy and
|
|
* do the swap there.
|
|
*/
|
|
struct ext2_group_desc *ext2fs_group_desc(ext2_filsys fs,
|
|
struct opaque_ext2_group_desc *gdp,
|
|
dgrp_t group)
|
|
{
|
|
if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT)
|
|
return (struct ext2_group_desc *)
|
|
((struct ext4_group_desc *) gdp + group);
|
|
else
|
|
return (struct ext2_group_desc *) gdp + group;
|
|
}
|
|
|
|
/* Do the same but as an ext4 group desc for internal use here */
|
|
static struct ext4_group_desc *ext4fs_group_desc(ext2_filsys fs,
|
|
struct opaque_ext2_group_desc *gdp,
|
|
dgrp_t group)
|
|
{
|
|
return (struct ext4_group_desc *)ext2fs_group_desc(fs, gdp, group);
|
|
}
|
|
|
|
/*
|
|
* Return the block bitmap block of a group
|
|
*/
|
|
blk64_t ext2fs_block_bitmap_loc(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_block_bitmap |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64)gdp->bg_block_bitmap_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the block bitmap block of a group
|
|
*/
|
|
void ext2fs_block_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_block_bitmap = blk;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_block_bitmap_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Return the inode bitmap block of a group
|
|
*/
|
|
blk64_t ext2fs_inode_bitmap_loc(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_inode_bitmap |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64) gdp->bg_inode_bitmap_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the inode bitmap block of a group
|
|
*/
|
|
void ext2fs_inode_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_inode_bitmap = blk;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_inode_bitmap_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Return the inode table block of a group
|
|
*/
|
|
blk64_t ext2fs_inode_table_loc(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_inode_table |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u64) gdp->bg_inode_table_hi << 32 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the inode table block of a group
|
|
*/
|
|
void ext2fs_inode_table_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_inode_table = blk;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_inode_table_hi = (__u64) blk >> 32;
|
|
}
|
|
|
|
/*
|
|
* Return the free blocks count of a group
|
|
*/
|
|
__u32 ext2fs_bg_free_blocks_count(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_free_blocks_count |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u32) gdp->bg_free_blocks_count_hi << 16 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the free blocks count of a group
|
|
*/
|
|
void ext2fs_bg_free_blocks_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_free_blocks_count = n;
|
|
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_free_blocks_count_hi = (__u32) n >> 16;
|
|
}
|
|
|
|
/*
|
|
* Return the free inodes count of a group
|
|
*/
|
|
__u32 ext2fs_bg_free_inodes_count(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_free_inodes_count |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u32) gdp->bg_free_inodes_count_hi << 16 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the free inodes count of a group
|
|
*/
|
|
void ext2fs_bg_free_inodes_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_free_inodes_count = n;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_free_inodes_count_hi = (__u32) n >> 16;
|
|
}
|
|
|
|
/*
|
|
* Return the used dirs count of a group
|
|
*/
|
|
__u32 ext2fs_bg_used_dirs_count(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_used_dirs_count |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u32) gdp->bg_used_dirs_count_hi << 16 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the used dirs count of a group
|
|
*/
|
|
void ext2fs_bg_used_dirs_count_set(ext2_filsys fs, dgrp_t group, __u32 n)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_used_dirs_count = n;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_used_dirs_count_hi = (__u32) n >> 16;
|
|
}
|
|
|
|
/*
|
|
* Return the unused inodes count of a group
|
|
*/
|
|
__u32 ext2fs_bg_itable_unused(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_itable_unused |
|
|
(fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_64BIT ?
|
|
(__u32) gdp->bg_itable_unused_hi << 16 : 0);
|
|
}
|
|
|
|
/*
|
|
* Set the unused inodes count of a group
|
|
*/
|
|
void ext2fs_bg_itable_unused_set(ext2_filsys fs, dgrp_t group, __u32 n)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_itable_unused = n;
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
gdp->bg_itable_unused_hi = (__u32) n >> 16;
|
|
}
|
|
|
|
/*
|
|
* Get the flags for this block group
|
|
*/
|
|
__u16 ext2fs_bg_flags(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_flags;
|
|
}
|
|
|
|
/*
|
|
* Zero out the flags for this block group
|
|
*/
|
|
void ext2fs_bg_flags_zap(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_flags = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get the value of a particular flag for this block group
|
|
*/
|
|
int ext2fs_bg_flags_test(ext2_filsys fs, dgrp_t group, __u16 bg_flag)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_flags & bg_flag;
|
|
}
|
|
|
|
/*
|
|
* Set a flag or set of flags for this block group
|
|
*/
|
|
void ext2fs_bg_flags_set(ext2_filsys fs, dgrp_t group, __u16 bg_flags)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_flags |= bg_flags;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Clear a flag or set of flags for this block group
|
|
*/
|
|
void ext2fs_bg_flags_clear(ext2_filsys fs, dgrp_t group, __u16 bg_flags)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_flags &= ~bg_flags;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get the checksum for this block group
|
|
*/
|
|
__u16 ext2fs_bg_checksum(ext2_filsys fs, dgrp_t group)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
return gdp->bg_checksum;
|
|
}
|
|
|
|
/*
|
|
* Set the checksum for this block group to a previously calculated value
|
|
*/
|
|
void ext2fs_bg_checksum_set(ext2_filsys fs, dgrp_t group, __u16 checksum)
|
|
{
|
|
struct ext4_group_desc *gdp;
|
|
|
|
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
|
|
gdp->bg_checksum = checksum;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get the acl block of a file
|
|
*/
|
|
blk64_t ext2fs_file_acl_block(ext2_filsys fs, const struct ext2_inode *inode)
|
|
{
|
|
blk64_t blk = inode->i_file_acl;
|
|
|
|
if (fs && fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
blk |= ((__u64) inode->osd2.linux2.l_i_file_acl_high) << 32;
|
|
return blk;
|
|
}
|
|
|
|
/*
|
|
* Set the acl block of a file
|
|
*/
|
|
void ext2fs_file_acl_block_set(ext2_filsys fs, struct ext2_inode *inode,
|
|
blk64_t blk)
|
|
{
|
|
inode->i_file_acl = blk;
|
|
if (fs && fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
|
|
inode->osd2.linux2.l_i_file_acl_high = (__u64) blk >> 32;
|
|
}
|
|
|