On Fri, May 09, 2025 at 02:20:32AM +0530, Ritesh Harjani (IBM) wrote:
> EXT4 only supports doing atomic write on inodes which uses extents, so
> add a check in ext4_inode_can_atomic_write() which gets called during
> open.
>
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
Makes sense seeing as advertising the awu geometry is gated on the
filesystem having extents turned on...
Acked-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
--D
> ---
> fs/ext4/ext4.h | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 5a20e9cd7184..c0240f6f6491 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -3847,7 +3847,9 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
> static inline bool ext4_inode_can_atomic_write(struct inode *inode)
> {
>
> - return S_ISREG(inode->i_mode) && EXT4_SB(inode->i_sb)->s_awu_min > 0;
> + return S_ISREG(inode->i_mode) &&
> + ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
> + EXT4_SB(inode->i_sb)->s_awu_min > 0;
> }
>
> extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
> --
> 2.49.0
>
>
