| /* |
| * 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) |
| { |
| return (struct ext2_group_desc *)((char *)gdp + |
| group * EXT2_DESC_SIZE(fs->super)); |
| } |
| |
| /* 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 (fs->super->s_desc_size >= 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 | |
| (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 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 (fs->super->s_desc_size >= 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 | |
| (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; |
| } |
| |