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ext4: add ext4_group_t, and change all group variables to this type.

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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>
This commit is contained in:
Avantika Mathur 2008-01-28 23:58:27 -05:00 • committed by Theodore Ts'o
parent bba907433b
commit fd2d42912f
9 changed files with 91 additions and 87 deletions
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5
fs/ext4/inode.c
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@ -2464,7 +2464,8 @@ out_stop:
static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
unsigned long ino, struct ext4_iloc *iloc)
{
unsigned long desc, group_desc, block_group;
unsigned long desc, group_desc;
ext4_group_t block_group;
unsigned long offset;
ext4_fsblk_t block;
struct buffer_head *bh;
@ -2551,7 +2552,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
struct ext4_group_desc *desc;
int inodes_per_buffer;
int inode_offset, i;
int block_group;
ext4_group_t block_group;
int start;
block_group = (inode->i_ino - 1) /