GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

46
fs/ext4/ialloc.c
View file

@ -64,8 +64,8 @@ void mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
}
/* Initializes an uninitialized inode bitmap */
unsigned ext4_init_inode_bitmap(struct super_block *sb,
struct buffer_head *bh, int block_group,
unsigned ext4_init_inode_bitmap(struct super_block *sb, struct buffer_head *bh,
ext4_group_t block_group,
struct ext4_group_desc *gdp)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -75,7 +75,7 @@ unsigned ext4_init_inode_bitmap(struct super_block *sb,
/* If checksum is bad mark all blocks and inodes use to prevent
* allocation, essentially implementing a per-group read-only flag. */
if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) {
ext4_error(sb, __FUNCTION__, "Checksum bad for group %u\n",
ext4_error(sb, __FUNCTION__, "Checksum bad for group %lu\n",
block_group);
gdp->bg_free_blocks_count = 0;
gdp->bg_free_inodes_count = 0;
@ -98,7 +98,7 @@ unsigned ext4_init_inode_bitmap(struct super_block *sb,
* Return buffer_head of bitmap on success or NULL.
*/
static struct buffer_head *
read_inode_bitmap(struct super_block * sb, unsigned long block_group)
read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
{
struct ext4_group_desc *desc;
struct buffer_head *bh = NULL;
@ -152,7 +152,7 @@ void ext4_free_inode (handle_t *handle, struct inode * inode)
unsigned long ino;
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *bh2;
unsigned long block_group;
ext4_group_t block_group;
unsigned long bit;
struct ext4_group_desc * gdp;
struct ext4_super_block * es;
@ -260,12 +260,12 @@ error_return:
* For other inodes, search forward from the parent directory\'s block
* group to find a free inode.
*/
static int find_group_dir(struct super_block *sb, struct inode *parent)
static ext4_group_t find_group_dir(struct super_block *sb, struct inode *parent)
{
int ngroups = EXT4_SB(sb)->s_groups_count;
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
unsigned int freei, avefreei;
struct ext4_group_desc *desc, *best_desc = NULL;
int group, best_group = -1;
ext4_group_t group, best_group = -1;
freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter);
avefreei = freei / ngroups;
@ -314,12 +314,13 @@ static int find_group_dir(struct super_block *sb, struct inode *parent)
#define INODE_COST 64
#define BLOCK_COST 256
static int find_group_orlov(struct super_block *sb, struct inode *parent)
static ext4_group_t find_group_orlov(struct super_block *sb,
struct inode *parent)
{
int parent_group = EXT4_I(parent)->i_block_group;
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
int ngroups = sbi->s_groups_count;
ext4_group_t ngroups = sbi->s_groups_count;
int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
unsigned int freei, avefreei;
ext4_fsblk_t freeb, avefreeb;
@ -327,7 +328,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
unsigned int ndirs;
int max_debt, max_dirs, min_inodes;
ext4_grpblk_t min_blocks;
int group = -1, i;
ext4_group_t group = -1, i;
struct ext4_group_desc *desc;
freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
@ -340,7 +341,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
if ((parent == sb->s_root->d_inode) ||
(EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) {
int best_ndir = inodes_per_group;
int best_group = -1;
ext4_group_t best_group = -1;
get_random_bytes(&group, sizeof(group));
parent_group = (unsigned)group % ngroups;
@ -415,12 +416,13 @@ fallback:
return -1;
}
static int find_group_other(struct super_block *sb, struct inode *parent)
static ext4_group_t find_group_other(struct super_block *sb,
struct inode *parent)
{
int parent_group = EXT4_I(parent)->i_block_group;
int ngroups = EXT4_SB(sb)->s_groups_count;
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
struct ext4_group_desc *desc;
int group, i;
ext4_group_t group, i;
/*
* Try to place the inode in its parent directory
@ -487,7 +489,7 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
struct super_block *sb;
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *bh2;
int group;
ext4_group_t group;
unsigned long ino = 0;
struct inode * inode;
struct ext4_group_desc * gdp = NULL;
@ -583,7 +585,7 @@ got:
ino > EXT4_INODES_PER_GROUP(sb)) {
ext4_error(sb, __FUNCTION__,
"reserved inode or inode > inodes count - "
"block_group = %d, inode=%lu", group,
"block_group = %lu, inode=%lu", group,
ino + group * EXT4_INODES_PER_GROUP(sb));
err = -EIO;
goto fail;
@ -777,7 +779,7 @@ fail_drop:
struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
{
unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
unsigned long block_group;
ext4_group_t block_group;
int bit;
struct buffer_head *bitmap_bh = NULL;
struct inode *inode = NULL;
@ -833,7 +835,7 @@ unsigned long ext4_count_free_inodes (struct super_block * sb)
{
unsigned long desc_count;
struct ext4_group_desc *gdp;
int i;
ext4_group_t i;
#ifdef EXT4FS_DEBUG
struct ext4_super_block *es;
unsigned long bitmap_count, x;
@ -879,7 +881,7 @@ unsigned long ext4_count_free_inodes (struct super_block * sb)
unsigned long ext4_count_dirs (struct super_block * sb)
{
unsigned long count = 0;
int i;
ext4_group_t i;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL);