To support DAX pmd mappings with unmodified applications, filesystems need to align an mmap address by the pmd size.
Call dax_get_unmapped_area() from f_op->get_unmapped_area. Note, there is no change in behavior for a non-DAX file. Signed-off-by: Toshi Kani <[email protected]> Cc: Jan Kara <[email protected]> Cc: Dan Williams <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Ross Zwisler <[email protected]> Cc: <[email protected]> --- fs/ext2/file.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext2/file.c b/fs/ext2/file.c index c1400b1..f1b8006 100644 --- a/fs/ext2/file.c +++ b/fs/ext2/file.c @@ -172,6 +172,9 @@ const struct file_operations ext2_file_operations = { .open = dquot_file_open, .release = ext2_release_file, .fsync = ext2_fsync, +#ifdef CONFIG_FS_DAX + .get_unmapped_area = dax_get_unmapped_area, +#endif .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, };
