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From: Jan Kara <jack@suse.cz>
To: Eric Biggers <ebiggers@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	Theodore Ts'o <tytso@mit.edu>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 03/12] fs: only specify I_DIRTY_TIME when needed in generic_update_time()
Date: Mon, 11 Jan 2021 15:50:29 +0100	[thread overview]
Message-ID: <20210111145029.GB18475@quack2.suse.cz> (raw)
In-Reply-To: <20210109075903.208222-4-ebiggers@kernel.org>

On Fri 08-01-21 23:58:54, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> generic_update_time() always passes I_DIRTY_TIME to
> __mark_inode_dirty(), which doesn't really make sense because (a)
> generic_update_time() might be asked to do only an i_version update, not
> also a timestamps update; and (b) I_DIRTY_TIME is only supposed to be
> set in i_state if the filesystem has lazytime enabled, so using it
> unconditionally in generic_update_time() is inconsistent.
> 
> As a result there is a weird edge case where if only an i_version update
> was requested (not also a timestamps update) but it is no longer needed
> (i.e. inode_maybe_inc_iversion() returns false), then I_DIRTY_TIME will
> be set in i_state even if the filesystem isn't mounted with lazytime.
> 
> Fix this by only passing I_DIRTY_TIME to __mark_inode_dirty() if the
> timestamps were updated and the filesystem has lazytime enabled.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza


> ---
>  fs/inode.c | 38 ++++++++++++++++++++------------------
>  1 file changed, 20 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 6442d97d9a4ab..d0fa43d8e9d5c 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1743,24 +1743,26 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
>  
>  int generic_update_time(struct inode *inode, struct timespec64 *time, int flags)
>  {
> -	int iflags = I_DIRTY_TIME;
> -	bool dirty = false;
> -
> -	if (flags & S_ATIME)
> -		inode->i_atime = *time;
> -	if (flags & S_VERSION)
> -		dirty = inode_maybe_inc_iversion(inode, false);
> -	if (flags & S_CTIME)
> -		inode->i_ctime = *time;
> -	if (flags & S_MTIME)
> -		inode->i_mtime = *time;
> -	if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
> -	    !(inode->i_sb->s_flags & SB_LAZYTIME))
> -		dirty = true;
> -
> -	if (dirty)
> -		iflags |= I_DIRTY_SYNC;
> -	__mark_inode_dirty(inode, iflags);
> +	int dirty_flags = 0;
> +
> +	if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
> +		if (flags & S_ATIME)
> +			inode->i_atime = *time;
> +		if (flags & S_CTIME)
> +			inode->i_ctime = *time;
> +		if (flags & S_MTIME)
> +			inode->i_mtime = *time;
> +
> +		if (inode->i_sb->s_flags & SB_LAZYTIME)
> +			dirty_flags |= I_DIRTY_TIME;
> +		else
> +			dirty_flags |= I_DIRTY_SYNC;
> +	}
> +
> +	if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
> +		dirty_flags |= I_DIRTY_SYNC;
> +
> +	__mark_inode_dirty(inode, dirty_flags);
>  	return 0;
>  }
>  EXPORT_SYMBOL(generic_update_time);
> -- 
> 2.30.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

WARNING: multiple messages have this Message-ID
From: Jan Kara <jack@suse.cz>
To: Eric Biggers <ebiggers@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-ext4@vger.kernel.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [f2fs-dev] [PATCH v2 03/12] fs: only specify I_DIRTY_TIME when needed in generic_update_time()
Date: Mon, 11 Jan 2021 15:50:29 +0100	[thread overview]
Message-ID: <20210111145029.GB18475@quack2.suse.cz> (raw)
In-Reply-To: <20210109075903.208222-4-ebiggers@kernel.org>

On Fri 08-01-21 23:58:54, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> generic_update_time() always passes I_DIRTY_TIME to
> __mark_inode_dirty(), which doesn't really make sense because (a)
> generic_update_time() might be asked to do only an i_version update, not
> also a timestamps update; and (b) I_DIRTY_TIME is only supposed to be
> set in i_state if the filesystem has lazytime enabled, so using it
> unconditionally in generic_update_time() is inconsistent.
> 
> As a result there is a weird edge case where if only an i_version update
> was requested (not also a timestamps update) but it is no longer needed
> (i.e. inode_maybe_inc_iversion() returns false), then I_DIRTY_TIME will
> be set in i_state even if the filesystem isn't mounted with lazytime.
> 
> Fix this by only passing I_DIRTY_TIME to __mark_inode_dirty() if the
> timestamps were updated and the filesystem has lazytime enabled.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza


> ---
>  fs/inode.c | 38 ++++++++++++++++++++------------------
>  1 file changed, 20 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 6442d97d9a4ab..d0fa43d8e9d5c 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1743,24 +1743,26 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
>  
>  int generic_update_time(struct inode *inode, struct timespec64 *time, int flags)
>  {
> -	int iflags = I_DIRTY_TIME;
> -	bool dirty = false;
> -
> -	if (flags & S_ATIME)
> -		inode->i_atime = *time;
> -	if (flags & S_VERSION)
> -		dirty = inode_maybe_inc_iversion(inode, false);
> -	if (flags & S_CTIME)
> -		inode->i_ctime = *time;
> -	if (flags & S_MTIME)
> -		inode->i_mtime = *time;
> -	if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
> -	    !(inode->i_sb->s_flags & SB_LAZYTIME))
> -		dirty = true;
> -
> -	if (dirty)
> -		iflags |= I_DIRTY_SYNC;
> -	__mark_inode_dirty(inode, iflags);
> +	int dirty_flags = 0;
> +
> +	if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
> +		if (flags & S_ATIME)
> +			inode->i_atime = *time;
> +		if (flags & S_CTIME)
> +			inode->i_ctime = *time;
> +		if (flags & S_MTIME)
> +			inode->i_mtime = *time;
> +
> +		if (inode->i_sb->s_flags & SB_LAZYTIME)
> +			dirty_flags |= I_DIRTY_TIME;
> +		else
> +			dirty_flags |= I_DIRTY_SYNC;
> +	}
> +
> +	if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
> +		dirty_flags |= I_DIRTY_SYNC;
> +
> +	__mark_inode_dirty(inode, dirty_flags);
>  	return 0;
>  }
>  EXPORT_SYMBOL(generic_update_time);
> -- 
> 2.30.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR


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  reply	other threads:[~2021-01-11 14:51 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-09  7:58 [PATCH v2 00/12] lazytime fix and cleanups Eric Biggers
2021-01-09  7:58 ` [f2fs-dev] " Eric Biggers
2021-01-09  7:58 ` [PATCH v2 01/12] fs: fix lazytime expiration handling in __writeback_single_inode() Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 10:48   ` Christoph Hellwig
2021-01-11 10:48     ` [f2fs-dev] " Christoph Hellwig
2021-01-11 14:46   ` Jan Kara
2021-01-11 14:46     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 02/12] fs: correctly document the inode dirty flags Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 14:48   ` Jan Kara
2021-01-11 14:48     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 03/12] fs: only specify I_DIRTY_TIME when needed in generic_update_time() Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 14:50   ` Jan Kara [this message]
2021-01-11 14:50     ` Jan Kara
2021-01-09  7:58 ` [PATCH v2 04/12] fat: only specify I_DIRTY_TIME when needed in fat_update_time() Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 10:52   ` Christoph Hellwig
2021-01-11 10:52     ` [f2fs-dev] " Christoph Hellwig
2021-01-11 19:50     ` Eric Biggers
2021-01-11 19:50       ` [f2fs-dev] " Eric Biggers
2021-01-12  5:21       ` Dave Chinner
2021-01-12  5:21         ` [f2fs-dev] " Dave Chinner
2021-01-12 13:23       ` Christoph Hellwig
2021-01-12 13:23         ` [f2fs-dev] " Christoph Hellwig
2021-01-11 14:52   ` Jan Kara
2021-01-11 14:52     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 05/12] fs: don't call ->dirty_inode for lazytime timestamp updates Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 14:54   ` Jan Kara
2021-01-11 14:54     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 06/12] fs: pass only I_DIRTY_INODE flags to ->dirty_inode Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 14:56   ` Jan Kara
2021-01-11 14:56     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 07/12] fs: clean up __mark_inode_dirty() a bit Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 14:59   ` Jan Kara
2021-01-11 14:59     ` [f2fs-dev] " Jan Kara
2021-01-09  7:58 ` [PATCH v2 08/12] fs: drop redundant check from __writeback_single_inode() Eric Biggers
2021-01-09  7:58   ` [f2fs-dev] " Eric Biggers
2021-01-11 10:52   ` Christoph Hellwig
2021-01-11 10:52     ` [f2fs-dev] " Christoph Hellwig
2021-01-11 15:00   ` Jan Kara
2021-01-11 15:00     ` [f2fs-dev] " Jan Kara
2021-01-09  7:59 ` [PATCH v2 09/12] fs: improve comments for writeback_single_inode() Eric Biggers
2021-01-09  7:59   ` [f2fs-dev] " Eric Biggers
2021-01-11 10:53   ` Christoph Hellwig
2021-01-11 10:53     ` [f2fs-dev] " Christoph Hellwig
2021-01-11 15:05   ` Jan Kara
2021-01-11 15:05     ` [f2fs-dev] " Jan Kara
2021-01-09  7:59 ` [PATCH v2 10/12] gfs2: don't worry about I_DIRTY_TIME in gfs2_fsync() Eric Biggers
2021-01-09  7:59   ` [f2fs-dev] " Eric Biggers
2021-01-11 15:06   ` Jan Kara
2021-01-11 15:06     ` [f2fs-dev] " Jan Kara
2021-01-09  7:59 ` [PATCH v2 11/12] ext4: simplify i_state checks in __ext4_update_other_inode_time() Eric Biggers
2021-01-09  7:59   ` [f2fs-dev] " Eric Biggers
2021-01-11 10:53   ` Christoph Hellwig
2021-01-11 10:53     ` [f2fs-dev] " Christoph Hellwig
2021-01-11 20:23     ` Eric Biggers
2021-01-11 20:23       ` [f2fs-dev] " Eric Biggers
2021-01-12 13:25       ` Christoph Hellwig
2021-01-12 13:25         ` [f2fs-dev] " Christoph Hellwig
2021-02-03  5:16         ` Theodore Ts'o
2021-02-03  5:16           ` [f2fs-dev] " Theodore Ts'o
2021-01-11 15:11   ` Jan Kara
2021-01-11 15:11     ` [f2fs-dev] " Jan Kara
2021-01-09  7:59 ` [PATCH v2 12/12] xfs: remove a stale comment from xfs_file_aio_write_checks() Eric Biggers
2021-01-09  7:59   ` [f2fs-dev] " Eric Biggers
2021-01-12 17:31   ` Darrick J. Wong
2021-01-12 17:31     ` [f2fs-dev] " Darrick J. Wong
2021-01-11 15:15 ` [PATCH v2 00/12] lazytime fix and cleanups Jan Kara
2021-01-11 15:15   ` [f2fs-dev] " Jan Kara
2021-01-11 20:44   ` Eric Biggers
2021-01-11 20:44     ` [f2fs-dev] " Eric Biggers
2021-02-03  5:11     ` Theodore Ts'o
2021-02-03  5:11       ` [f2fs-dev] " Theodore Ts'o
2021-02-03  5:22       ` Eric Biggers
2021-02-03  5:22         ` [f2fs-dev] " Eric Biggers
2021-02-03 15:49         ` Theodore Ts'o
2021-02-03 15:49           ` [f2fs-dev] " Theodore Ts'o

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