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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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20
fs/ext4/super.c
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@ -1364,7 +1364,7 @@ static int ext4_check_descriptors (struct super_block * sb)
struct ext4_group_desc * gdp = NULL;
int desc_block = 0;
int flexbg_flag = 0;
int i;
ext4_group_t i;
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
flexbg_flag = 1;
@ -1386,7 +1386,7 @@ static int ext4_check_descriptors (struct super_block * sb)
if (block_bitmap < first_block || block_bitmap > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
"Block bitmap for group %d"
"Block bitmap for group %lu"
" not in group (block %llu)!",
i, block_bitmap);
return 0;
@ -1395,7 +1395,7 @@ static int ext4_check_descriptors (struct super_block * sb)
if (inode_bitmap < first_block || inode_bitmap > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
"Inode bitmap for group %d"
"Inode bitmap for group %lu"
" not in group (block %llu)!",
i, inode_bitmap);
return 0;
@ -1405,17 +1405,16 @@ static int ext4_check_descriptors (struct super_block * sb)
inode_table + sbi->s_itb_per_group - 1 > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
"Inode table for group %d"
"Inode table for group %lu"
" not in group (block %llu)!",
i, inode_table);
return 0;
}
if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
ext4_error(sb, __FUNCTION__,
"Checksum for group %d failed (%u!=%u)\n", i,
le16_to_cpu(ext4_group_desc_csum(sbi, i,
gdp)),
le16_to_cpu(gdp->bg_checksum));
"Checksum for group %lu failed (%u!=%u)\n",
i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
gdp)), le16_to_cpu(gdp->bg_checksum));
return 0;
}
if (!flexbg_flag)
@ -1429,7 +1428,6 @@ static int ext4_check_descriptors (struct super_block * sb)
return 1;
}
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
* the superblock) which were deleted from all directories, but held open by
* a process at the time of a crash. We walk the list and try to delete these
@ -1570,7 +1568,7 @@ static ext4_fsblk_t descriptor_loc(struct super_block *sb,
ext4_fsblk_t logical_sb_block, int nr)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
unsigned long bg, first_meta_bg;
ext4_group_t bg, first_meta_bg;
int has_super = 0;
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
@ -2678,7 +2676,7 @@ static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
if (test_opt(sb, MINIX_DF)) {
sbi->s_overhead_last = 0;
} else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
unsigned long ngroups = sbi->s_groups_count, i;
ext4_group_t ngroups = sbi->s_groups_count, i;
ext4_fsblk_t overhead = 0;
smp_rmb();