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From: "Ondřej Jirman" <megi@xff.cz>
To: Chao Yu <yuchao0@huawei.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>,
	linux-kernel@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] Writes stoped working on f2fs after the compression support was added
Date: Wed, 26 Feb 2020 13:11:43 +0100	[thread overview]
Message-ID: <20200226121143.uag224cqzqossvlv@core.my.home> (raw)
In-Reply-To: <72d28eba-53b9-b6f4-01a5-45b2352f4285@huawei.com>

On Wed, Feb 26, 2020 at 09:58:03AM +0800, Chao Yu wrote:
> On 2020/2/25 20:27, Ondřej Jirman wrote:
> > So this time it just took several times longer to appear (8-20mins to the hang):
> > 
> > https://megous.com/dl/tmp/dmesg1
> > https://megous.com/dl/tmp/dmesg2
> 
> Alright, I still didn't see any possible deadlock in f2fs.
> 
> Can you try below patch? I'd like to see whether spinlock can cause the same issue.

Uptime 60 minutes and it didn't hang so far. I applied it on top of the previous
patch:
  
  https://megous.com/git/linux/log/?h=f2fs-debug-5.6

regards,
	o.

> From 3e9e8daf922eaa2c5db195ce278e89e10191c516 Mon Sep 17 00:00:00 2001
> From: Chao Yu <yuchao0@huawei.com>
> Date: Wed, 26 Feb 2020 09:53:03 +0800
> Subject: [PATCH] fix
> 
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
>  fs/f2fs/compress.c | 4 ++--
>  fs/f2fs/data.c     | 4 ++--
>  fs/f2fs/f2fs.h     | 5 +++--
>  fs/f2fs/file.c     | 4 ++--
>  fs/f2fs/super.c    | 1 +
>  5 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index b4ff25dc55a9..6de0872ad881 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -906,10 +906,10 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
>  	f2fs_put_dnode(&dn);
>  	f2fs_unlock_op(sbi);
> 
> -	down_write(&fi->i_sem);
> +	spin_lock(&fi->i_size_lock);
>  	if (fi->last_disk_size < psize)
>  		fi->last_disk_size = psize;
> -	up_write(&fi->i_sem);
> +	spin_unlock(&fi->i_size_lock);
> 
>  	f2fs_put_rpages(cc);
>  	f2fs_destroy_compress_ctx(cc);
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index cb41260ca941..5c9b072cf0de 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2651,10 +2651,10 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
>  	if (err) {
>  		file_set_keep_isize(inode);
>  	} else {
> -		down_write(&F2FS_I(inode)->i_sem);
> +		spin_lock(&F2FS_I(inode)->i_size_lock);
>  		if (F2FS_I(inode)->last_disk_size < psize)
>  			F2FS_I(inode)->last_disk_size = psize;
> -		up_write(&F2FS_I(inode)->i_sem);
> +		spin_unlock(&F2FS_I(inode)->i_size_lock);
>  	}
> 
>  done:
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4a02edc2454b..1a8af2020e72 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -701,6 +701,7 @@ struct f2fs_inode_info {
>  	struct task_struct *cp_task;	/* separate cp/wb IO stats*/
>  	nid_t i_xattr_nid;		/* node id that contains xattrs */
>  	loff_t	last_disk_size;		/* lastly written file size */
> +	spinlock_t i_size_lock;		/* protect last_disk_size */
> 
>  #ifdef CONFIG_QUOTA
>  	struct dquot *i_dquot[MAXQUOTAS];
> @@ -2882,9 +2883,9 @@ static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
>  	if (!f2fs_is_time_consistent(inode))
>  		return false;
> 
> -	down_read(&F2FS_I(inode)->i_sem);
> +	spin_lock(&F2FS_I(inode)->i_size_lock);
>  	ret = F2FS_I(inode)->last_disk_size == i_size_read(inode);
> -	up_read(&F2FS_I(inode)->i_sem);
> +	spin_unlock(&F2FS_I(inode)->i_size_lock);
> 
>  	return ret;
>  }
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index fdb492c2f248..56fe18fbb2ef 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -938,10 +938,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
>  		if (err)
>  			return err;
> 
> -		down_write(&F2FS_I(inode)->i_sem);
> +		spin_lock(&F2FS_I(inode)->i_size_lock);
>  		inode->i_mtime = inode->i_ctime = current_time(inode);
>  		F2FS_I(inode)->last_disk_size = i_size_read(inode);
> -		up_write(&F2FS_I(inode)->i_sem);
> +		spin_unlock(&F2FS_I(inode)->i_size_lock);
>  	}
> 
>  	__setattr_copy(inode, attr);
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 0b16204d3b7d..2d0e5d1269f5 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -957,6 +957,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
>  	/* Initialize f2fs-specific inode info */
>  	atomic_set(&fi->dirty_pages, 0);
>  	init_rwsem(&fi->i_sem);
> +	spin_lock_init(&fi->i_size_lock);
>  	INIT_LIST_HEAD(&fi->dirty_list);
>  	INIT_LIST_HEAD(&fi->gdirty_list);
>  	INIT_LIST_HEAD(&fi->inmem_ilist);
> -- 
> 2.18.0.rc1
> 
> 
> 
> 
> > 
> > thank you and regards,
> > 	o.
> > 
> >> thank you and regards,
> >> 	o.
> >>
> >>> Thanks,
> >>>
> >>>>
> >>>> So it's probably not inode locking.
> >>>>
> >>>>> root@tbs2[/proc/sys/kernel] # dmesg | grep down_read | wc -l
> >>>>> 16
> >>>>> root@tbs2[/proc/sys/kernel] # dmesg | grep up_read | wc -l
> >>>>> 16
> >>>>>
> >>>>> regards,
> >>>>> 	o.
> >>>>>
> >>>>>> thank you,
> >>>>>> 	o.
> >>>>>>
> >>>>>>>> Thanks,
> >>>>>>>>
> >>>>>>>>> [  246.758190]  r5:eff213b0 r4:da283c60
> >>>>>>>>> [  246.758198] [<c0435578>] (f2fs_write_single_data_page) from [<c0435fd8>] (f2fs_write_cache_pages+0x2b4/0x7c4)
> >>>>>>>>> [  246.758204]  r10:da645c28 r9:da283d60 r8:da283c60 r7:0000000f r6:da645d80 r5:00000001
> >>>>>>>>> [  246.758206]  r4:eff213b0
> >>>>>>>>> [  246.758214] [<c0435d24>] (f2fs_write_cache_pages) from [<c043682c>] (f2fs_write_data_pages+0x344/0x35c)
> >>>>>>>>> [  246.758220]  r10:00000000 r9:d9ed002c r8:d9ed0000 r7:00000004 r6:da283d60 r5:da283c60
> >>>>>>>>> [  246.758223]  r4:da645d80
> >>>>>>>>> [  246.758238] [<c04364e8>] (f2fs_write_data_pages) from [<c0267ee8>] (do_writepages+0x3c/0xd4)
> >>>>>>>>> [  246.758244]  r10:0000000a r9:c0e03d00 r8:00000c00 r7:c0264ddc r6:da645d80 r5:da283d60
> >>>>>>>>> [  246.758246]  r4:da283c60
> >>>>>>>>> [  246.758254] [<c0267eac>] (do_writepages) from [<c0310cbc>] (__writeback_single_inode+0x44/0x454)
> >>>>>>>>> [  246.758259]  r7:da283d60 r6:da645eac r5:da645d80 r4:da283c60
> >>>>>>>>> [  246.758266] [<c0310c78>] (__writeback_single_inode) from [<c03112d0>] (writeback_sb_inodes+0x204/0x4b0)
> >>>>>>>>> [  246.758272]  r10:0000000a r9:c0e03d00 r8:da283cc8 r7:da283c60 r6:da645eac r5:da283d08
> >>>>>>>>> [  246.758274]  r4:d9dc9848
> >>>>>>>>> [  246.758281] [<c03110cc>] (writeback_sb_inodes) from [<c03115cc>] (__writeback_inodes_wb+0x50/0xe4)
> >>>>>>>>> [  246.758287]  r10:da3797a8 r9:c0e03d00 r8:d9dc985c r7:da645eac r6:00000000 r5:d9dc9848
> >>>>>>>>> [  246.758289]  r4:da5a8800
> >>>>>>>>> [  246.758296] [<c031157c>] (__writeback_inodes_wb) from [<c03118f4>] (wb_writeback+0x294/0x338)
> >>>>>>>>> [  246.758302]  r10:fffbf200 r9:da644000 r8:c0e04e64 r7:d9dc9848 r6:d9dc9874 r5:da645eac
> >>>>>>>>> [  246.758305]  r4:d9dc9848
> >>>>>>>>> [  246.758312] [<c0311660>] (wb_writeback) from [<c0312dac>] (wb_workfn+0x35c/0x54c)
> >>>>>>>>> [  246.758318]  r10:da5f2005 r9:d9dc984c r8:d9dc9948 r7:d9dc9848 r6:00000000 r5:d9dc9954
> >>>>>>>>> [  246.758321]  r4:000031e6
> >>>>>>>>> [  246.758334] [<c0312a50>] (wb_workfn) from [<c014f2b8>] (process_one_work+0x214/0x544)
> >>>>>>>>> [  246.758340]  r10:da5f2005 r9:00000200 r8:00000000 r7:da5f2000 r6:ef044400 r5:da5eb000
> >>>>>>>>> [  246.758343]  r4:d9dc9954
> >>>>>>>>> [  246.758350] [<c014f0a4>] (process_one_work) from [<c014f634>] (worker_thread+0x4c/0x574)
> >>>>>>>>> [  246.758357]  r10:ef044400 r9:c0e03d00 r8:ef044418 r7:00000088 r6:ef044400 r5:da5eb014
> >>>>>>>>> [  246.758359]  r4:da5eb000
> >>>>>>>>> [  246.758368] [<c014f5e8>] (worker_thread) from [<c01564fc>] (kthread+0x144/0x170)
> >>>>>>>>> [  246.758374]  r10:ec9e5e90 r9:dabf325c r8:da5eb000 r7:da644000 r6:00000000 r5:da5fe000
> >>>>>>>>> [  246.758377]  r4:dabf3240
> >>>>>>>>> [  246.758386] [<c01563b8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
> >>>>>>>>> [  246.758391] Exception stack(0xda645fb0 to 0xda645ff8)
> >>>>>>>>> [  246.758397] 5fa0:                                     00000000 00000000 00000000 00000000
> >>>>>>>>> [  246.758402] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> >>>>>>>>> [  246.758407] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> >>>>>>>>> [  246.758413]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c01563b8
> >>>>>>>>> [  246.758416]  r4:da5fe000
> >>>>>>>>> .
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> _______________________________________________
> >>>>>>>> Linux-f2fs-devel mailing list
> >>>>>>>> Linux-f2fs-devel@lists.sourceforge.net
> >>>>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>>>>>>>
> >>>> .
> >>>>
> > .
> > 

  reply	other threads:[~2020-02-26 12:11 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 22:23 [PATCH 1/6] f2fs: call f2fs_balance_fs outside of locked page Jaegeuk Kim
2019-12-09 22:23 ` [PATCH 2/6] f2fs: declare nested quota_sem and remove unnecessary sems Jaegeuk Kim
2019-12-10  6:20   ` [f2fs-dev] " Chao Yu
2019-12-09 22:23 ` [PATCH 3/6] f2fs: keep quota data on write_begin failure Jaegeuk Kim
2019-12-10  6:22   ` [f2fs-dev] " Chao Yu
2019-12-09 22:23 ` [PATCH 4/6] f2fs: should avoid recursive filesystem ops Jaegeuk Kim
2019-12-10  6:22   ` [f2fs-dev] " Chao Yu
2019-12-09 22:23 ` [PATCH 5/6] f2fs: set GFP_NOFS when moving inline dentries Jaegeuk Kim
2019-12-10  6:22   ` [f2fs-dev] " Chao Yu
2019-12-09 22:23 ` [PATCH 6/6] f2fs: set I_LINKABLE early to avoid wrong access by vfs Jaegeuk Kim
2019-12-10  6:37   ` [f2fs-dev] " Chao Yu
2019-12-11  1:21     ` Jaegeuk Kim
2019-12-11  1:23       ` Chao Yu
2019-12-11  1:31         ` Jaegeuk Kim
2019-12-11  1:42           ` Chao Yu
2019-12-12 16:55             ` Jaegeuk Kim
2019-12-10  2:09 ` [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance_fs outside of locked page Chao Yu
2020-02-22  4:46 ` Ondřej Jirman
2020-02-22 18:17   ` Writes stoped working on f2fs after the compression support was added Ondřej Jirman
2020-02-24 10:37     ` Chao Yu
2020-02-24 10:41       ` [f2fs-dev] " Chao Yu
2020-02-24 13:58         ` Ondřej Jirman
2020-02-24 14:03           ` Ondřej Jirman
2020-02-24 14:31             ` Ondřej Jirman
2020-02-25 11:24               ` Chao Yu
2020-02-25 11:32                 ` Chao Yu
2020-02-25 12:08                 ` Ondřej Jirman
2020-02-25 12:27                   ` Ondřej Jirman
2020-02-26  1:58                     ` Chao Yu
2020-02-26 12:11                       ` Ondřej Jirman [this message]
2020-02-26 18:05                         ` Ondřej Jirman
2020-02-27  2:01                           ` Chao Yu
2020-03-06 12:02                             ` Ondřej Jirman
2020-03-06 12:43                               ` Ondřej Jirman
2020-03-11  9:02                               ` Chao Yu
2020-03-11 10:33                                 ` Ondřej Jirman
2020-03-11 10:51                                   ` Chao Yu
2020-03-11 11:01                                     ` Ondřej Jirman
2020-03-11 17:01                               ` Jaegeuk Kim
2020-03-22 10:15                                 ` Chao Yu
2020-02-24 14:20         ` Ondřej Jirman

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