On 30.01.2018 16:34, David Sterba wrote:
> On Fri, Jan 12, 2018 at 04:21:05PM +0200, Nikolay Borisov wrote:
>> @@ -6062,19 +6062,19 @@ int btrfs_delalloc_reserve_metadata(struct
>> btrfs_inode *inode, u64 num_bytes)
>> * If we have a transaction open (can happen if we call truncate_block
>> * from truncate), then we need FLUSH_LIMIT so we don't deadlock.
>> */
>> +
>> if (btrfs_is_free_space_inode(inode)) {
>> flush = BTRFS_RESERVE_NO_FLUSH;
>> delalloc_lock = false;
>> - } else if (current->journal_info) {
>> - flush = BTRFS_RESERVE_FLUSH_LIMIT;
>> - }
>> + } else {
>> + if (current->journal_info)
>> + flush = BTRFS_RESERVE_FLUSH_LIMIT;
>>
>> - if (flush != BTRFS_RESERVE_NO_FLUSH &&
>> - btrfs_transaction_in_commit(fs_info))
>> - schedule_timeout(1);
>> + if (btrfs_transaction_in_commit(fs_info))
>> + schedule_timeout(1);
>>
>> - if (delalloc_lock)
>> mutex_lock(&inode->delalloc_mutex);
>> + }
>
> Squeezing the condition branches makes the code more readable, I have
> only one objection and it's the mutex_lock. It IMHO looks better when
> it's a separate branch as it pairs with the unlock:
>
> if (delalloc_lock)
> mutex_lock(...);
>
> ...
>
> if (delalloc_lock)
> mutex_unlock(...);
>
> In your version it's implied by the first if that checks
> btrfs_is_free_space_inode and delalloc_lock is hidden there.
>
My line of thought when developing the patch was that delalloc is
another level of indirection and. What I wanted to achieve in the end is
to make it clear that delalloc_mutex really depends on whether we are
reserving for the freespace inode or not.
>>
>> num_bytes = ALIGN(num_bytes, fs_info->sectorsize);
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