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Date:   Wed, 11 Dec 2019 10:25:48 -0500
From:   Sasha Levin <>
Cc:     Matthew Bobrowski <>,
        Jan Kara <>,
        Ritesh Harjani <>,
        Theodore Ts'o <>, Sasha Levin <>,
Subject: [PATCH AUTOSEL 4.19 24/79] ext4: iomap that extends beyond EOF should be marked dirty

From: Matthew Bobrowski <>

[ Upstream commit 2e9b51d78229d5145725a481bb5464ebc0a3f9b2 ]

This patch addresses what Dave Chinner had discovered and fixed within
commit: 7684e2c4384d. This changes does not have any user visible
impact for ext4 as none of the current users of ext4_iomap_begin()
that extend files depend on IOMAP_F_DIRTY.

When doing a direct IO that spans the current EOF, and there are
written blocks beyond EOF that extend beyond the current write, the
only metadata update that needs to be done is a file size extension.

However, we don't mark such iomaps as IOMAP_F_DIRTY to indicate that
there is IO completion metadata updates required, and hence we may
fail to correctly sync file size extensions made in IO completion when
O_DSYNC writes are being used and the hardware supports FUA.

Hence when setting IOMAP_F_DIRTY, we need to also take into account
whether the iomap spans the current EOF. If it does, then we need to
mark it dirty so that IO completion will call generic_write_sync() to
flush the inode size update to stable storage correctly.

Signed-off-by: Matthew Bobrowski <>
Reviewed-by: Jan Kara <>
Reviewed-by: Ritesh Harjani <>
Signed-off-by: Theodore Ts'o <>
Signed-off-by: Sasha Levin <>
 fs/ext4/inode.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 00d25a0643913..8eaf7a581be65 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3535,8 +3535,14 @@ retry:
 			return ret;
+	/*
+	 * Writes that span EOF might trigger an I/O size update on completion,
+	 * so consider them to be dirty for the purposes of O_DSYNC, even if
+	 * there is no other metadata changes being made or are pending here.
+	 */
 	iomap->flags = 0;
-	if (ext4_inode_datasync_dirty(inode))
+	if (ext4_inode_datasync_dirty(inode) ||
+	    offset + length > i_size_read(inode))
 		iomap->flags |= IOMAP_F_DIRTY;
 	iomap->bdev = inode->i_sb->s_bdev;
 	iomap->dax_dev = sbi->s_daxdev;

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