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 <toshi.kani@xxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: <linux-ext4@xxxxxxxxxxxxxxx>
---
fs/ext4/file.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index fa2208b..2abc57b 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -708,6 +708,9 @@ const struct file_operations ext4_file_operations = {
.open = ext4_file_open,
.release = ext4_release_file,
.fsync = ext4_sync_file,
+#ifdef CONFIG_FS_DAX
+ .get_unmapped_area = dax_get_unmapped_area,
+#endif
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ext4_fallocate,
--
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