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In many places variables for block group are of type int, which limits the maximum number of block groups to 2^31. Each block group can have up to 2^15 blocks, with a 4K block size, and the max filesystem size is limited to 2^31 * (2^15 * 2^12) = 2^58 -- or 256 PB This patch introduces a new type ext4_group_t, of type unsigned long, to represent block group numbers in ext4. All occurrences of block group variables are converted to type ext4_group_t. Signed-off-by: Avantika Mathur <mathur@us.ibm.com>
29 lines
1 KiB
C
29 lines
1 KiB
C
/*
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* linux/fs/ext4/group.h
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*
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* Copyright (C) 2007 Cluster File Systems, Inc
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*
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* Author: Andreas Dilger <adilger@clusterfs.com>
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*/
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#ifndef _LINUX_EXT4_GROUP_H
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#define _LINUX_EXT4_GROUP_H
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extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
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struct ext4_group_desc *gdp);
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extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
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struct ext4_group_desc *gdp);
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struct buffer_head *read_block_bitmap(struct super_block *sb,
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ext4_group_t block_group);
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extern unsigned ext4_init_block_bitmap(struct super_block *sb,
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struct buffer_head *bh,
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ext4_group_t group,
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struct ext4_group_desc *desc);
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#define ext4_free_blocks_after_init(sb, group, desc) \
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ext4_init_block_bitmap(sb, NULL, group, desc)
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extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
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struct buffer_head *bh,
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ext4_group_t group,
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struct ext4_group_desc *desc);
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extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
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#endif /* _LINUX_EXT4_GROUP_H */
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