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ext4: add MB_NUM_ORDERS macro

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A few arrays in mballoc.c use the total number of valid orders as
their size. Currently, this value is set as "sb->s_blocksize_bits +
2". This makes code harder to read. So, instead add a new macro
MB_NUM_ORDERS(sb) to make the code more readable.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Reviewed-by: Ritesh Harjani <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20210401172129.189766-5-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2021-04-01 10:21:26 -07:00 committed by Theodore Ts'o
parent a6c75eaf11
commit 4b68f6df10
2 changed files with 15 additions and 9 deletions
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19
fs/ext4/mballoc.c
View file

@ -756,7 +756,7 @@ mb_set_largest_free_order(struct super_block *sb, struct ext4_group_info *grp)
grp->bb_largest_free_order = -1; /* uninit */
bits = sb->s_blocksize_bits + 1;
bits = MB_NUM_ORDERS(sb) - 1;
for (i = bits; i >= 0; i--) {
if (grp->bb_counters[i] > 0) {
grp->bb_largest_free_order = i;
@ -957,7 +957,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
grinfo->bb_fragments = 0;
memset(grinfo->bb_counters, 0,
sizeof(*grinfo->bb_counters) *
(sb->s_blocksize_bits+2));
(MB_NUM_ORDERS(sb)));
/*
* incore got set to the group block bitmap below
*/
@ -1928,7 +1928,7 @@ void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac,
int max;
BUG_ON(ac->ac_2order <= 0);
for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) {
for (i = ac->ac_2order; i < MB_NUM_ORDERS(sb); i++) {
if (grp->bb_counters[i] == 0)
continue;
@ -2107,7 +2107,7 @@ static bool ext4_mb_good_group(struct ext4_allocation_context *ac,
if (free < ac->ac_g_ex.fe_len)
return false;
if (ac->ac_2order > ac->ac_sb->s_blocksize_bits+1)
if (ac->ac_2order >= MB_NUM_ORDERS(ac->ac_sb))
return true;
if (grp->bb_largest_free_order < ac->ac_2order)
@ -2315,13 +2315,13 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
* We also support searching for power-of-two requests only for
* requests upto maximum buddy size we have constructed.
*/
if (i >= sbi->s_mb_order2_reqs && i <= sb->s_blocksize_bits + 2) {
if (i >= sbi->s_mb_order2_reqs && i <= MB_NUM_ORDERS(sb)) {
/*
* This should tell if fe_len is exactly power of 2
*/
if ((ac->ac_g_ex.fe_len & (~(1 << (i - 1)))) == 0)
ac->ac_2order = array_index_nospec(i - 1,
sb->s_blocksize_bits + 2);
MB_NUM_ORDERS(sb));
}
/* if stream allocation is enabled, use global goal */
@ -2880,7 +2880,7 @@ int ext4_mb_init(struct super_block *sb)
unsigned max;
int ret;
i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_offsets);
i = MB_NUM_ORDERS(sb) * sizeof(*sbi->s_mb_offsets);
sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL);
if (sbi->s_mb_offsets == NULL) {
@ -2888,7 +2888,7 @@ int ext4_mb_init(struct super_block *sb)
goto out;
}
i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_maxs);
i = MB_NUM_ORDERS(sb) * sizeof(*sbi->s_mb_maxs);
sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
if (sbi->s_mb_maxs == NULL) {
ret = -ENOMEM;
@ -2914,7 +2914,8 @@ int ext4_mb_init(struct super_block *sb)
offset_incr = offset_incr >> 1;
max = max >> 1;
i++;
} while (i <= sb->s_blocksize_bits + 1);
} while (i < MB_NUM_ORDERS(sb));
spin_lock_init(&sbi->s_md_lock);
sbi->s_mb_free_pending = 0;

5
fs/ext4/mballoc.h
View file

@ -78,6 +78,11 @@
*/
#define MB_DEFAULT_MAX_INODE_PREALLOC 512
/*
* Number of valid buddy orders
*/
#define MB_NUM_ORDERS(sb) ((sb)->s_blocksize_bits + 2)
struct ext4_free_data {
/* this links the free block information from sb_info */
struct list_head efd_list;