Patch "fs/dax.c: fix inefficiency in dax_writeback_mapping_range()" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

fs/dax.c: fix inefficiency in dax_writeback_mapping_range()

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
fs-dax.c-fix-inefficiency-in-dax_writeback_mapping_range.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Jan Kara <[email protected]>
Date: Fri, 23 Jun 2017 15:08:46 -0700
Subject: fs/dax.c: fix inefficiency in dax_writeback_mapping_range()

From: Jan Kara <[email protected]>

commit 1eb643d02b21412e603b42cdd96010a2ac31c05f upstream.

dax_writeback_mapping_range() fails to update iteration index when searching radix tree for entries needing cache flushing. Thus each pagevec worth of entries is searched starting from the start which is inefficient and prone to livelocks. Update index properly.

---
 fs/dax.c |    1 +
 1 file changed, 1 insertion(+)

@@ -875,6 +875,7 @@ int dax_writeback_mapping_range(struct a
 			if (ret < 0)
 				return ret;
 		}
+		start_index = indices[pvec.nr - 1] + 1;
 	}
 	return 0;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/fs-dax.c-fix-inefficiency-in-dax_writeback_mapping_range.patch