linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: expose quota information in debugfs

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Date:   Thu, 16 Nov 2017 10:34:46 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: expose quota information in debugfs

On 2017/11/16 0:24, Jaegeuk Kim wrote:
> On 11/15, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> On 2017/11/14 13:12, Jaegeuk Kim wrote:
>>> This patch shows # of dirty pages and # of hidden quota files.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>>  fs/f2fs/debug.c | 11 +++++++++++
>>>  fs/f2fs/f2fs.h  | 10 ++++++++--
>>>  2 files changed, 19 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
>>> index f7eec506ceea..ecada8425268 100644
>>> --- a/fs/f2fs/debug.c
>>> +++ b/fs/f2fs/debug.c
>>> @@ -45,9 +45,18 @@ static void update_general_status(struct f2fs_sb_info *sbi)
>>>  	si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
>>>  	si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
>>>  	si->ndirty_data = get_pages(sbi, F2FS_DIRTY_DATA);
>>> +	si->ndirty_qdata = get_pages(sbi, F2FS_DIRTY_QDATA);
>>>  	si->ndirty_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
>>>  	si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
>>>  	si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
>>> +
>>> +	si->nquota_files = 0;
>>> +	if (f2fs_sb_has_quota_ino(sbi->sb)) {
>>> +		for (i = 0; i < MAXQUOTAS; i++) {
>>> +			if (f2fs_qf_ino(sbi->sb, i))
>>> +				si->nquota_files++;
>>> +		}
>>> +	}
>>>  	si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
>>>  	si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
>>>  	si->aw_cnt = atomic_read(&sbi->aw_cnt);
>>> @@ -369,6 +378,8 @@ static int stat_show(struct seq_file *s, void *v)
>>>  			   si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
>>>  		seq_printf(s, "  - datas: %4d in files:%4d\n",
>>>  			   si->ndirty_data, si->ndirty_files);
>>> +		seq_printf(s, "  - quota datas: %4d in quota files:%4d\n",
>>> +			   si->ndirty_qdata, si->nquota_files);
>>>  		seq_printf(s, "  - meta: %4d in %4d\n",
>>>  			   si->ndirty_meta, si->meta_pages);
>>>  		seq_printf(s, "  - imeta: %4d\n",
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 5c379a8ea075..44f874483ecf 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -865,6 +865,7 @@ struct f2fs_sm_info {
>>>  enum count_type {
>>>  	F2FS_DIRTY_DENTS,
>>>  	F2FS_DIRTY_DATA,
>>> +	F2FS_DIRTY_QDATA,
>>>  	F2FS_DIRTY_NODES,
>>>  	F2FS_DIRTY_META,
>>>  	F2FS_INMEM_PAGES,
>>> @@ -1642,6 +1643,8 @@ static inline void inode_inc_dirty_pages(struct inode *inode)
>>>  	atomic_inc(&F2FS_I(inode)->dirty_pages);
>>>  	inc_page_count(F2FS_I_SB(inode), S_ISDIR(inode->i_mode) ?
>>>  				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA);
>>> +	if (IS_NOQUOTA(inode))
>>
>> If we're trying to get quota sysfile information, how about using sysfile ino
>> for distinguishing from normal file?
> 
> I'm afraid of needless loop first. And, the goal is to expose hidden sysfile
> though, we actually don't need to count it only.

I just saw in somewhere, we will tag S_NOQUOTA in non-quota inode, e.g. failed
created inode, but I didn't see there will be any dirty page creation/removal
in such inode so far, so we're safe to track dirty page count for inodes tagged
with S_NOQUOTA flag.

Thanks,

> 
> Thanks,
> 
>>
>> Thanks,
>>
>>> +		inc_page_count(F2FS_I_SB(inode), F2FS_DIRTY_QDATA);
>>>  }
>>>  
>>>  static inline void dec_page_count(struct f2fs_sb_info *sbi, int count_type)
>>> @@ -1658,6 +1661,8 @@ static inline void inode_dec_dirty_pages(struct inode *inode)
>>>  	atomic_dec(&F2FS_I(inode)->dirty_pages);
>>>  	dec_page_count(F2FS_I_SB(inode), S_ISDIR(inode->i_mode) ?
>>>  				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA);
>>> +	if (IS_NOQUOTA(inode))
>>> +		dec_page_count(F2FS_I_SB(inode), F2FS_DIRTY_QDATA);
>>>  }
>>>  
>>>  static inline s64 get_pages(struct f2fs_sb_info *sbi, int count_type)
>>> @@ -2771,9 +2776,10 @@ struct f2fs_stat_info {
>>>  	unsigned long long hit_largest, hit_cached, hit_rbtree;
>>>  	unsigned long long hit_total, total_ext;
>>>  	int ext_tree, zombie_tree, ext_node;
>>> -	int ndirty_node, ndirty_dent, ndirty_meta, ndirty_data, ndirty_imeta;
>>> +	int ndirty_node, ndirty_dent, ndirty_meta, ndirty_imeta;
>>> +	int ndirty_data, ndirty_qdata;
>>>  	int inmem_pages;
>>> -	unsigned int ndirty_dirs, ndirty_files, ndirty_all;
>>> +	unsigned int ndirty_dirs, ndirty_files, nquota_files, ndirty_all;
>>>  	int nats, dirty_nats, sits, dirty_sits;
>>>  	int free_nids, avail_nids, alloc_nids;
>>>  	int total_count, utilization;
>>>
> 
> .
>