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charset="utf-8" Validate that an atomic write adheres to length/offset rules. Currently we can only write a single FS block. For an IOCB with IOCB_ATOMIC set to get as far as xfs_file_write_iter(), FMODE_CAN_ATOMIC_WRITE will need to be set for the file; for this, ATOMICWRITES flags would also need to be set for the inode. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 412b1d71b52b..3a0a35e7826a 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -822,6 +822,14 @@ xfs_file_write_iter( if (IS_DAX(inode)) return xfs_file_dax_write(iocb, from); =20 + if (iocb->ki_flags & IOCB_ATOMIC) { + if (ocount !=3D ip->i_mount->m_sb.sb_blocksize) + return -EINVAL; + ret =3D generic_atomic_write_valid(iocb, from); + if (ret) + return ret; + } + if (iocb->ki_flags & IOCB_DIRECT) { /* * Allow a directio write to fall back to a buffered --=20 2.31.1