2010/3/22, tytso@xxxxxxx <tytso@xxxxxxx>:
> On Sun, Mar 21, 2010 at 10:01:06PM +0800, jing zhang wrote:
>> From: Jing Zhang <zj.barak@xxxxxxxxx>
>>
>> Date: Sun Mar 21 21:59:35 2010
>>
>> Cc: Theodore Ts'o <tytso@xxxxxxx>
>> Cc: Andreas Dilger <adilger@xxxxxxx>
>> Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Jing Zhang <zj.barak@xxxxxxxxx>
>>
>> ---
>>
>> --- linux-2.6.32/fs/ext4/mballoc.c 2009-12-03 11:51:22.000000000 +0800
>> +++ ext4_mm_leak/mballoc3.c 2010-03-21 21:37:18.000000000 +0800
>> @@ -2360,6 +2360,24 @@ err_freesgi:
>> return -ENOMEM;
>> }
>>
>> +static void ext4_mb_destroy_backend(struct super_block *sb)
>> +{
>> + ext4_group_t ngroups = ext4_get_groups_count(sb);
>> + ext4_group_t i;
>> + struct ext4_sb_info *sbi = EXT4_SB(sb);
>> + int j;
>> + int num_meta_group_infos = (ngroups + EXT4_DESC_PER_BLOCK(sb) -1)
>> + >> EXT4_DESC_PER_BLOCK_BITS(sb);
>> + for (i = 0; i < ngroups; i++)
>> + kfree(ext4_get_group_info(sb, i));
>> +
>> + for (j = 0; j < num_meta_group_infos; j++)
>> + kfree(sbi->s_group_info[j]);
>> +
>> + kfree(sbi->s_group_info);
>> + iput(sbi->s_buddy_cache);
>> +}
>> +
>
> It would be better if this could be done by making ext4_mb_release()
> more flexible, and then calling ext4_mb_release() if there is an error
> setting up the data structures in ext4_mb_init().
>
> - Ted
>
Yeah, Ted, going through ext4_mb_release() is clearer.
---
diff --git a/linux-2.6.32/fs/ext4/mballoc.c b/ext4_mm_leak/mballoc3.c
index bba1282..99ca2de 100644
--- a/linux-2.6.32/fs/ext4/mballoc.c
+++ b/ext4_mm_leak/mballoc3.c
@@ -2417,8 +2417,7 @@ int ext4_mb_init(struct super_block *sb, int
needs_recovery)
sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group);
if (sbi->s_locality_groups == NULL) {
- kfree(sbi->s_mb_offsets);
- kfree(sbi->s_mb_maxs);
+ ext4_mb_release(sb);
return -ENOMEM;
}
for_each_possible_cpu(i) {
@@ -2511,7 +2510,8 @@ int ext4_mb_release(struct super_block *sb)
atomic_read(&sbi->s_mb_discarded));
}
- free_percpu(sbi->s_locality_groups);
+ if (sbi->s_locality_groups)
+ free_percpu(sbi->s_locality_groups);
if (sbi->s_proc)
remove_proc_entry("mb_groups", sbi->s_proc);
--
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