mm: do_sync_mapping_range integrity fix

Chris Mason notices do_sync_mapping_range didn't actually ask for data
integrity writeout.  Unfortunately, it is advertised as being usable for
data integrity operations.

This is a data integrity bug.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/sync.c b/fs/sync.c
index 0921d6d..ac02b56 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -295,7 +295,7 @@ int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
 
        if (flags & SYNC_FILE_RANGE_WRITE) {
                ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
-                                               WB_SYNC_NONE);
+                                               WB_SYNC_ALL);
                if (ret < 0)
                        goto out;
        }