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 <toshi.k...@hpe.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Matthew Wilcox <mawil...@microsoft.com>
Cc: Ross Zwisler <ross.zwis...@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
Cc: Dave Chinner <da...@fromorbit.com>
Cc: Jan Kara <j...@suse.cz>
Cc: Theodore Ts'o <ty...@mit.edu>
Cc: Andreas Dilger <adilger.ker...@dilger.ca>
Cc: Mike Kravetz <mike.krav...@oracle.com>
---
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,
};
