linux-kernel - Re: [f2fs-dev] [PATCH 2/4] f2fs: build stat

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Date:   Thu, 9 Mar 2017 17:11:28 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH 2/4] f2fs: build stat_info before orphan inode
 recovery

On 2017/3/8 6:13, Jaegeuk Kim wrote:
> f2fs_sync_fs() -> write_checkpoint() calls stat_inc_cp_count(sbi->stat_info),
> which needs stat_info allocation.
> Otherwise, we can hit:
> 
> [254042.598623]  ? count_shadow_nodes+0xa0/0xa0
> [254042.598633]  f2fs_sync_fs+0x65/0xd0 [f2fs]
> [254042.598645]  f2fs_balance_fs_bg+0xe4/0x1c0 [f2fs]
> [254042.598657]  f2fs_write_node_pages+0x34/0x1a0 [f2fs]
> [254042.598664]  ? pagevec_lookup_entries+0x1e/0x30
> [254042.598673]  do_writepages+0x1e/0x30
> [254042.598682]  __writeback_single_inode+0x45/0x330
> [254042.598688]  writeback_single_inode+0xd7/0x190
> [254042.598694]  write_inode_now+0x86/0xa0
> [254042.598699]  iput+0x122/0x200
> [254042.598709]  f2fs_fill_super+0xd4a/0x14d0 [f2fs]
> [254042.598717]  mount_bdev+0x184/0x1c0
> [254042.598934]  ? f2fs_commit_super+0x100/0x100 [f2fs]
> [254042.599142]  f2fs_mount+0x15/0x20 [f2fs]
> [254042.599349]  mount_fs+0x39/0x160
> [254042.599554]  ? __alloc_percpu+0x15/0x20
> [254042.599759]  vfs_kern_mount+0x67/0x110
> [254042.599972]  do_mount+0x1bb/0xc80
> [254042.600175]  ? memdup_user+0x42/0x60
> [254042.600380]  SyS_mount+0x83/0xd0
> [254042.600583]  entry_SYSCALL_64_fastpath+0x1e/0xad
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/super.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 96fe8ed73100..cfb40d3fd875 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2022,6 +2022,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  
>  	f2fs_join_shrinker(sbi);
>  
> +	err = f2fs_build_stats(sbi);
> +	if (err)
> +		goto free_nm;

Both node_inode and shrinker need to be released and detached.

How about relocate f2fs_build_stats in front of build_segment_manager?

Thanks,

> +
>  	/* if there are nt orphan nodes free them */
>  	err = recover_orphan_inodes(sbi);
>  	if (err)
> @@ -2046,10 +2050,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  		goto free_root_inode;
>  	}
>  
> -	err = f2fs_build_stats(sbi);
> -	if (err)
> -		goto free_root_inode;
> -
>  	if (f2fs_proc_root)
>  		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
>  
> @@ -2143,7 +2143,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  		remove_proc_entry("segment_bits", sbi->s_proc);
>  		remove_proc_entry(sb->s_id, f2fs_proc_root);
>  	}
> -	f2fs_destroy_stats(sbi);
>  free_root_inode:
>  	dput(sb->s_root);
>  	sb->s_root = NULL;
> @@ -2161,6 +2160,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  	truncate_inode_pages_final(META_MAPPING(sbi));
>  	iput(sbi->node_inode);
>  	mutex_unlock(&sbi->umount_mutex);
> +	f2fs_destroy_stats(sbi);
>  free_nm:
>  	destroy_node_manager(sbi);
>  free_sm:
>