To support DAX pmd mappings with unmodified applications, filesystems need to align an mmap address by the pmd size.
Call thp_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: Andrew Morton <[email protected]> Cc: Dan Williams <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Ross Zwisler <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Dave Chinner <[email protected]> Cc: Jan Kara <[email protected]> Cc: Theodore Ts'o <[email protected]> Cc: Andreas Dilger <[email protected]> Cc: Mike Kravetz <[email protected]> --- fs/ext2/file.c | 1 + fs/ext4/file.c | 1 + fs/xfs/xfs_file.c | 1 + 3 files changed, 3 insertions(+) diff --git a/fs/ext2/file.c b/fs/ext2/file.c index 5efeefe..d86831c 100644 --- a/fs/ext2/file.c +++ b/fs/ext2/file.c @@ -172,6 +172,7 @@ const struct file_operations ext2_file_operations = { .open = dquot_file_open, .release = ext2_release_file, .fsync = ext2_fsync, + .get_unmapped_area = thp_get_unmapped_area, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, }; diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 261ac37..28f542b 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -703,6 +703,7 @@ const struct file_operations ext4_file_operations = { .open = ext4_file_open, .release = ext4_release_file, .fsync = ext4_sync_file, + .get_unmapped_area = thp_get_unmapped_area, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .fallocate = ext4_fallocate, diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index e612a02..7f71bb8 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1662,6 +1662,7 @@ const struct file_operations xfs_file_operations = { .open = xfs_file_open, .release = xfs_file_release, .fsync = xfs_file_fsync, + .get_unmapped_area = thp_get_unmapped_area, .fallocate = xfs_file_fallocate, };
