Commit dbe6ec81 authored Oct 07, 2016 by Toshi Kani Committed by Linus Torvalds Oct 07, 2016

ext2/4, xfs: call thp_get_unmapped_area() for pmd mappings

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.

Link: http://lkml.kernel.org/r/1472497881-9323-3-git-send-email-toshi.kani@hpe.com


Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 74d2fad1

fs/ext2/file.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -234,6 +234,7 @@ 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,
		};

fs/ext4/file.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,

fs/xfs/xfs_file.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1618,6 +1618,7 @@ 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,
		};

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