/*
* 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 +
EXT2_GROUPS_TO_BLOCKS(fs->super, 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 |
(ext2fs_has_feature_huge_file(fs->super) ?
(__u64) inode->osd2.linux2.l_i_blocks_hi << 32 : 0)) -
(inode->i_file_acl ? EXT2_CLUSTER_SIZE(fs->super) >> 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 |
(ext2fs_has_feature_huge_file(fs->super) ?
(__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0));
}
/*
* Return the inode i_blocks in stat (512 byte) units
*/
blk64_t ext2fs_get_stat_i_blocks(ext2_filsys fs,
struct ext2_inode *inode)
{
blk64_t ret = inode->i_blocks;
if (ext2fs_has_feature_huge_file(fs->super)) {
ret += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
if (inode->i_flags & EXT4_HUGE_FILE_FL)
ret *= (fs->blocksize / 512);
}
return ret;
}
/*
* Return the fs block count
*/
blk64_t ext2fs_blocks_count(struct ext2_super_block *super)
{
return super->s_blocks_count |
(ext2fs_has_feature_64bit(super) ?
(__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 (ext2fs_has_feature_64bit(super))
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 |
(ext2fs_has_feature_64bit(super) ?
(__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 (ext2fs_has_feature_64bit(super))
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 |
(ext2fs_has_feature_64bit(super) ?
(__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 (ext2fs_has_feature_64bit(super))
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)
{
int desc_size = EXT2_DESC_SIZE(fs->super) & ~7;
return (struct ext2_group_desc *)((char *)gdp + group * desc_size);
}
/* 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 checksum of a group
*/
__u32 ext2fs_block_bitmap_checksum(ext2_filsys fs, dgrp_t group)
{
struct ext4_group_desc *gdp;
__u32 csum;
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
csum = gdp->bg_block_bitmap_csum_lo;
if (EXT2_DESC_SIZE(fs->super) >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION)
csum |= ((__u32)gdp->bg_block_bitmap_csum_hi << 16);
return csum;
}
/*
* 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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
gdp->bg_block_bitmap_hi = (__u64) blk >> 32;
}
/*
* Return the inode bitmap checksum of a group
*/
__u32 ext2fs_inode_bitmap_checksum(ext2_filsys fs, dgrp_t group)
{
struct ext4_group_desc *gdp;
__u32 csum;
gdp = ext4fs_group_desc(fs, fs->group_desc, group);
csum = gdp->bg_inode_bitmap_csum_lo;
if (EXT2_DESC_SIZE(fs->super) >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
csum |= ((__u32)gdp->bg_inode_bitmap_csum_hi << 16);
return csum;
}
/*
* 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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 |
(ext2fs_has_feature_64bit(fs->super) ?
(__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 (ext2fs_has_feature_64bit(fs->super))
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 && ext2fs_has_feature_64bit(fs->super))
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 && ext2fs_has_feature_64bit(fs->super))
inode->osd2.linux2.l_i_file_acl_high = (__u64) blk >> 32;
}
/*
* Set the size of the inode
*/
errcode_t ext2fs_inode_size_set(ext2_filsys fs, struct ext2_inode *inode,
ext2_off64_t size)
{
if (size < 0)
return EINVAL;
/* Only regular files get to be larger than 4GB */
if (!LINUX_S_ISREG(inode->i_mode) && (size >> 32))
return EXT2_ET_FILE_TOO_BIG;
/* If we're writing a large file, set the large_file flag */
if (LINUX_S_ISREG(inode->i_mode) &&
ext2fs_needs_large_file_feature(size) &&
(!ext2fs_has_feature_large_file(fs->super) ||
fs->super->s_rev_level == EXT2_GOOD_OLD_REV)) {
ext2fs_set_feature_large_file(fs->super);
ext2fs_update_dynamic_rev(fs);
ext2fs_mark_super_dirty(fs);
}
inode->i_size = size & 0xffffffff;
inode->i_size_high = (size >> 32);
return 0;
}