From: "Theodore Y. Ts'o" <tytso@mit.edu> To: Eric Biggers <ebiggers@kernel.org> Cc: Linux Filesystem Development List <linux-fsdevel@vger.kernel.org>, Ext4 Developers List <linux-ext4@vger.kernel.org>, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [PATCH] writeback: avoid double-writing the inode on a lazytime expiration Date: Wed, 11 Mar 2020 08:57:49 -0400 [thread overview] Message-ID: <20200311125749.GA7159@mit.edu> (raw) In-Reply-To: <20200311032009.GC46757@gmail.com> On Tue, Mar 10, 2020 at 08:20:09PM -0700, Eric Biggers wrote: > Thanks Ted! This fixes the fscrypt test failure. > > However, are you sure this works correctly on all filesystems? I'm not sure > about XFS. XFS only implements ->dirty_inode(), not ->write_inode(), and in its > ->dirty_inode() it does: ... > if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME)) > return; That's true, but when the timestamps were originally modified, dirty_inode() will be called with flag == I_DIRTY_TIME, which will *not* be a no-op; which is to say, XFS will force the timestamps to be updated on disk when the timestamps are first dirtied, because it doesn't support I_DIRTY_TIME. So I think we're fine. - Ted
WARNING: multiple messages have this Message-ID (diff)
From: "Theodore Y. Ts'o" <tytso@mit.edu> To: Eric Biggers <ebiggers@kernel.org> Cc: Linux Filesystem Development List <linux-fsdevel@vger.kernel.org>, Ext4 Developers List <linux-ext4@vger.kernel.org>, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [f2fs-dev] [PATCH] writeback: avoid double-writing the inode on a lazytime expiration Date: Wed, 11 Mar 2020 08:57:49 -0400 [thread overview] Message-ID: <20200311125749.GA7159@mit.edu> (raw) In-Reply-To: <20200311032009.GC46757@gmail.com> On Tue, Mar 10, 2020 at 08:20:09PM -0700, Eric Biggers wrote: > Thanks Ted! This fixes the fscrypt test failure. > > However, are you sure this works correctly on all filesystems? I'm not sure > about XFS. XFS only implements ->dirty_inode(), not ->write_inode(), and in its > ->dirty_inode() it does: ... > if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME)) > return; That's true, but when the timestamps were originally modified, dirty_inode() will be called with flag == I_DIRTY_TIME, which will *not* be a no-op; which is to say, XFS will force the timestamps to be updated on disk when the timestamps are first dirtied, because it doesn't support I_DIRTY_TIME. So I think we're fine. - Ted _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
next prev parent reply other threads:[~2020-03-11 12:58 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-06 0:45 lazytime causing inodes to remain dirty after sync? Eric Biggers 2020-03-06 0:45 ` [f2fs-dev] " Eric Biggers 2020-03-07 2:00 ` [PATCH] writeback: avoid double-writing the inode on a lazytime expiration Theodore Ts'o 2020-03-07 2:00 ` [f2fs-dev] " Theodore Ts'o 2020-03-11 3:20 ` Eric Biggers 2020-03-11 3:20 ` [f2fs-dev] " Eric Biggers 2020-03-11 12:57 ` Theodore Y. Ts'o [this message] 2020-03-11 12:57 ` Theodore Y. Ts'o 2020-03-12 0:07 ` Dave Chinner 2020-03-12 0:07 ` [f2fs-dev] " Dave Chinner 2020-03-12 14:34 ` Christoph Hellwig 2020-03-12 14:34 ` [f2fs-dev] " Christoph Hellwig 2020-03-12 22:39 ` Dave Chinner 2020-03-12 22:39 ` [f2fs-dev] " Dave Chinner 2020-03-20 2:46 ` Theodore Y. Ts'o 2020-03-20 2:46 ` [f2fs-dev] " Theodore Y. Ts'o 2020-03-20 2:52 ` [PATCH 1/2] " Theodore Ts'o 2020-03-20 2:52 ` [f2fs-dev] " Theodore Ts'o 2020-03-20 2:52 ` [PATCH 2/2] writeback, xfs: call dirty_inode() with I_DIRTY_TIME_EXPIRED when appropriate Theodore Ts'o 2020-03-20 2:52 ` [f2fs-dev] " Theodore Ts'o 2020-03-23 17:58 ` Theodore Y. Ts'o 2020-03-23 17:58 ` [f2fs-dev] " Theodore Y. Ts'o 2020-03-24 8:37 ` Christoph Hellwig 2020-03-24 8:37 ` [f2fs-dev] " Christoph Hellwig 2020-03-24 18:43 ` Theodore Y. Ts'o 2020-03-24 18:43 ` [f2fs-dev] " Theodore Y. Ts'o 2020-03-25 9:20 ` [PATCH 1/2] writeback: avoid double-writing the inode on a lazytime expiration Christoph Hellwig 2020-03-25 9:20 ` [f2fs-dev] " Christoph Hellwig 2020-03-25 15:21 ` Theodore Y. Ts'o 2020-03-25 15:21 ` [f2fs-dev] " Theodore Y. Ts'o 2020-03-25 15:47 ` Darrick J. Wong 2020-03-25 15:47 ` [f2fs-dev] " Darrick J. Wong 2020-03-11 23:54 ` [PATCH] " Dave Chinner 2020-03-11 23:54 ` [f2fs-dev] " Dave Chinner
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