From: zhengbin <zhengbin13@xxxxxxxxxx> Subject: mm/filemap: pass inclusive 'end_byte' parameter to filemap_range_has_page The 'end_byte' parameter of filemap_range_has_page is required to be inclusive, so follow the rule. Link: http://lkml.kernel.org/r/1548678679-18122-1-git-send-email-zhengbin13@xxxxxxxxxx Fixes: 6be96d3ad34a ("fs: return if direct I/O will trigger writeback") Signed-off-by: zhengbin <zhengbin13@xxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxx> Acked-by: Christoph Hellwig <hch@xxxxxx> Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> Cc: Amir Goldstein <amir73il@xxxxxxxxx> Cc: Dave Chinner <david@xxxxxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Hou Tao <houtao1@xxxxxxxxxx> Cc: zhangyi (F) <yi.zhang@xxxxxxxxxx> Cc: Jan Kara <jack@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/filemap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/filemap.c~mm-filemap-pass-inclusive-end_byte-parameter-to-filemap_range_has_page +++ a/mm/filemap.c @@ -3071,7 +3071,7 @@ generic_file_direct_write(struct kiocb * if (iocb->ki_flags & IOCB_NOWAIT) { /* If there are pages to writeback, return */ if (filemap_range_has_page(inode->i_mapping, pos, - pos + write_len)) + pos + write_len - 1)) return -EAGAIN; } else { written = filemap_write_and_wait_range(mapping, pos, _
