linux-ext4 - Re: [PATCH] ext4: Automatic setting of {INODE,BLOCK}

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Message-Id: <3946C047-0561-4E6B-9F0B-CBB0763A4822@gmail.com>
Date:	Thu, 25 Oct 2012 07:37:03 -0700
From:	Andreas Dilger <aedilger@...il.com>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	Tomas Racek <tracek@...hat.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"lczerner@...hat.com" <lczerner@...hat.com>
Subject: Re: [PATCH] ext4: Automatic setting of {INODE,BLOCK}_UNINIT flags

On 2012-10-25, at 0:44, Yongqiang Yang <xiaoqiangnk@...il.com> wrote:
> Does it make sense in no journal mode?

This is even more important in nojournal mode, since that will need to run e2fsck after every boot. 

Cheers, Andreas

> On Thu, Oct 25, 2012 at 3:25 PM, Tomas Racek <tracek@...hat.com> wrote:
>> When last inode from bg is freed, set the INODE_UNINIT flag, similarly
>> when last block is freed, set BLOCK_UNINIT flag. This can speed up
>> subsequent fsck run.
>> 
>> Signed-off-by: Tomas Racek <tracek@...hat.com>
>> ---
>> fs/ext4/ialloc.c  | 4 ++++
>> fs/ext4/mballoc.c | 4 ++++
>> 2 files changed, 8 insertions(+)
>> 
>> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
>> index 4facdd2..6e4b982 100644
>> --- a/fs/ext4/ialloc.c
>> +++ b/fs/ext4/ialloc.c
>> @@ -289,6 +289,10 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
>> 
>>        count = ext4_free_inodes_count(sb, gdp) + 1;
>>        ext4_free_inodes_set(sb, gdp, count);
>> +
>> +       if (count == EXT4_INODES_PER_GROUP(sb))
>> +               gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_UNINIT);
>> +
>>        if (is_directory) {
>>                count = ext4_used_dirs_count(sb, gdp) - 1;
>>                ext4_used_dirs_set(sb, gdp, count);
>> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
>> index 526e553..28bce35 100644
>> --- a/fs/ext4/mballoc.c
>> +++ b/fs/ext4/mballoc.c
>> @@ -4665,6 +4665,10 @@ do_more:
>> 
>>        ret = ext4_free_group_clusters(sb, gdp) + count_clusters;
>>        ext4_free_group_clusters_set(sb, gdp, ret);
>> +
>> +       if(ret == EXT4_BLOCKS_PER_GROUP(sb))
>> +               gdp->bg_flags |= cpu_to_le16(EXT4_BG_BLOCK_UNINIT);
>> +
>>        ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh);
>>        ext4_group_desc_csum_set(sb, block_group, gdp);
>>        ext4_unlock_group(sb, block_group);
>> --
>> 1.7.11.7
>> 
>> --
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> 
> 
> 
> -- 
> Best Wishes
> Yongqiang Yang
> --
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