From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com> mainline inclusion from mainline-v6.12-rc1 commit 43c696f9d094061e958e31be7f1dae66bc25d389 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8862 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Let's validate the given constraints for atomic write request. Otherwise it will fail with -EINVAL. Currently atomic write is only supported on DIO, so for buffered-io it will return -EOPNOTSUPP. Reviewed-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/ext4/file.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index e3cbb520f8bc..f22530345254 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -732,6 +732,20 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) if (IS_DAX(inode)) return ext4_dax_write_iter(iocb, from); #endif + + if (iocb->ki_flags & IOCB_ATOMIC) { + size_t len = iov_iter_count(from); + int ret; + + if (len < EXT4_SB(inode->i_sb)->s_awu_min || + len > EXT4_SB(inode->i_sb)->s_awu_max) + return -EINVAL; + + ret = generic_atomic_write_valid(iocb, from); + if (ret) + return ret; + } + if (iocb->ki_flags & IOCB_DIRECT) return ext4_dio_write_iter(iocb, from); else -- 2.52.0