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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_dio_write(), 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 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 412b1d71b52b..fa6a44b88ecc 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -688,6 +688,13 @@ xfs_file_dio_write( struct xfs_buftarg *target =3D xfs_inode_buftarg(ip); size_t count =3D iov_iter_count(from); =20 + if (iocb->ki_flags & IOCB_ATOMIC) { + if (count !=3D ip->i_mount->m_sb.sb_blocksize) + return -EINVAL; + if (!generic_atomic_write_valid(iocb, from)) + return -EINVAL; + } + /* direct I/O must be aligned to device logical sector size */ if ((iocb->ki_pos | count) & target->bt_logical_sectormask) return -EINVAL; --=20 2.31.1