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Subject[PATCH] f2fs: Fix direct IO handling
f2fs_preallocate_blocks() identifies direct IOs using the IOCB_DIRECT
flag for a kiocb structure. However, the file system direct IO handler
function f2fs_direct_IO() may have decided that a direct IO has to be
exececuted as a buffered IO using the function f2fs_force_buffered_io().
This is the case for instance for volumes including zoned block device
and for unaligned write IOs with LFS mode enabled.

These 2 different methods of identifying direct IOs can result in
inconsistencies generating stale data access for direct reads after a
direct IO write that is treated as a buffered write. Fix this
inconsistency by combining the IOCB_DIRECT flag test with the result
of f2fs_force_buffered_io().

Reported-by: Javier Gonzalez <>
Signed-off-by: Damien Le Moal <>
fs/f2fs/data.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5755e897a5f0..8ac2d3b70022 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1073,6 +1073,8 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
int flag;
int err = 0;
bool direct_io = iocb->ki_flags & IOCB_DIRECT;
+ bool do_direct_io = direct_io &&
+ !f2fs_force_buffered_io(inode, iocb, from);

/* convert inline data for Direct I/O*/
if (direct_io) {
@@ -1081,7 +1083,7 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
return err;

- if (direct_io && allow_outplace_dio(inode, iocb, from))
+ if (do_direct_io && allow_outplace_dio(inode, iocb, from))
return 0;

if (is_inode_flag_set(inode, FI_NO_PREALLOC))
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