@@ -692,6 +692,20 @@ 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
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. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> --- fs/ext4/file.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)