Akira Fujita wrote:
>
> Aneesh Kumar K.V wrote:
>> On Thu, Dec 04, 2008 at 10:27:25AM +0900, Akira Fujita wrote:
>>> Hi Aneesh,
>>> Aneesh Kumar K.V wrote:
>>>> On Mon, Dec 01, 2008 at 07:21:54PM +0900, Akira Fujita wrote:
>>>>> ext4: Fix s_dirty_blocks_counter if block allocation failed with
>>>>> nodelalloc
>>>>>
>>>>> From: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
>>>>>
>>>>> If block allocation failed after marking claimed blocks as dirty
>>>>> blocks
>>>>> with nodelalloc, we have to subtract these blocks from
>>>>> s_dirty_blocks_counter in error handling.
>>>>> Otherwise s_dirty_blocks_counter goes wrong so that
>>>>> filesystem's free blocks decreases incorrectly.
>>>> Why did the block allocation fail ? With delayed allocation ENOSPC
>>>> should not happen during block allocation. That would mean we did
>>>> something wrong in block reservation.
>>> My case was *nodelalloc* and FS was almost full.
>>> This problem occurs in multiple defrag running in short time.
>>> Usually defrag releases temporary inode's blocks with iput,
>>> then FS free blocks are recover but contiguous blocks do not recover
>>> until next journal commit.
>>> so we can not re-use contiguous blocks immediately.
>>> There are enough free blocks in FS so that
>>> ext4_claim_free_blocks marks claimed blocks as dirty,
>>> but ext4_regular_allocator can not find enough blocks,
>>> so mb_new_blocks returns ENOSPC without decreasing dirty blocks.
>>>
>> ok how about doing the check once in ext4_mb_new_blocks.
>
> It works fine. Thank you.
> Tested-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
>
I'll test it when I'm free and have access to the test machine. :)
But not this week..
>> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
>> index bacc2f4..22d31c3 100644
>> --- a/fs/ext4/mballoc.c
>> +++ b/fs/ext4/mballoc.c
>> @@ -4550,7 +4550,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
>> }
>> if (ar->len == 0) {
>> *errp = -EDQUOT;
>> - return 0;
>> + goto out3;
>> }
>> inquota = ar->len;
>>
>> @@ -4623,6 +4623,13 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
>> out1:
>> if (ar->len < inquota)
>> DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
>> +out3:
>> + if (!ar->len) {
>> + if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
>> + /* release all the reserved blocks if non delalloc */
>> + percpu_counter_sub(&sbi->s_dirtyblocks_counter,
>> + reserv_blks);
>> + }
>>
>> return block;
>> }
>
>
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