linux-ext4 - Re: [PATCH 1/2] ext3: init statistics after journal recovery

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Date:	Mon, 12 Apr 2010 23:34:12 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 1/2] ext3: init statistics after journal recovery

Jan Kara <jack@...e.cz> writes:

> On Mon 12-04-10 23:12:55, Dmitry Monakhov wrote:
>> Currently block/inode/dir counters initialized before journal was
>> recovered. In fact after journal recovery this info will probably
>> change. And freeblocks it critical for correct delalloc mode
>> accounting.
>> BUG:#15768
>   Thanks for the patch. Could you please also rename failed_mount4
> to failed_mount3 so that the label numbering is continguous? Otherwise
> the patch is fine.
Ok, in a minute.
> 								Honza
>> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
>> ---
>>  fs/ext3/super.c |   38 ++++++++++++++++++--------------------
>>  1 files changed, 18 insertions(+), 20 deletions(-)
>> 
>> diff --git a/fs/ext3/super.c b/fs/ext3/super.c
>> index e844acc..613b5ed 100644
>> --- a/fs/ext3/super.c
>> +++ b/fs/ext3/super.c
>> @@ -1890,21 +1890,6 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
>>  	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
>>  	spin_lock_init(&sbi->s_next_gen_lock);
>>  
>> -	err = percpu_counter_init(&sbi->s_freeblocks_counter,
>> -			ext3_count_free_blocks(sb));
>> -	if (!err) {
>> -		err = percpu_counter_init(&sbi->s_freeinodes_counter,
>> -				ext3_count_free_inodes(sb));
>> -	}
>> -	if (!err) {
>> -		err = percpu_counter_init(&sbi->s_dirs_counter,
>> -				ext3_count_dirs(sb));
>> -	}
>> -	if (err) {
>> -		ext3_msg(sb, KERN_ERR, "error: insufficient memory");
>> -		goto failed_mount3;
>> -	}
>> -
>>  	/* per fileystem reservation list head & lock */
>>  	spin_lock_init(&sbi->s_rsv_window_lock);
>>  	sbi->s_rsv_window_root = RB_ROOT;
>> @@ -1945,16 +1930,30 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
>>  	if (!test_opt(sb, NOLOAD) &&
>>  	    EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
>>  		if (ext3_load_journal(sb, es, journal_devnum))
>> -			goto failed_mount3;
>> +			goto failed_mount2;
>>  	} else if (journal_inum) {
>>  		if (ext3_create_journal(sb, es, journal_inum))
>> -			goto failed_mount3;
>> +			goto failed_mount2;
>>  	} else {
>>  		if (!silent)
>>  			ext3_msg(sb, KERN_ERR,
>>  				"error: no journal found. "
>>  				"mounting ext3 over ext2?");
>> -		goto failed_mount3;
>> +		goto failed_mount2;
>> +	}
>> +	err = percpu_counter_init(&sbi->s_freeblocks_counter,
>> +			ext3_count_free_blocks(sb));
>> +	if (!err) {
>> +		err = percpu_counter_init(&sbi->s_freeinodes_counter,
>> +				ext3_count_free_inodes(sb));
>> +	}
>> +	if (!err) {
>> +		err = percpu_counter_init(&sbi->s_dirs_counter,
>> +				ext3_count_dirs(sb));
>> +	}
>> +	if (err) {
>> +		ext3_msg(sb, KERN_ERR, "error: insufficient memory");
>> +		goto failed_mount4;
>>  	}
>>  
>>  	/* We have now updated the journal if required, so we can
>> @@ -2040,11 +2039,10 @@ cantfind_ext3:
>>  	goto failed_mount;
>>  
>>  failed_mount4:
>> -	journal_destroy(sbi->s_journal);
>> -failed_mount3:
>>  	percpu_counter_destroy(&sbi->s_freeblocks_counter);
>>  	percpu_counter_destroy(&sbi->s_freeinodes_counter);
>>  	percpu_counter_destroy(&sbi->s_dirs_counter);
>> +	journal_destroy(sbi->s_journal);
>>  failed_mount2:
>>  	for (i = 0; i < db_count; i++)
>>  		brelse(sbi->s_group_desc[i]);
>> -- 
>> 1.6.6.1
>> 
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