[PATCH] fs: ecryptfs: fixed msync to flush data

From: Paul Taysom
Date: Thu May 23 2013 - 17:33:10 EST

When msync is called on a memory mapped file, that
data is not flushed to the disk.

In Linux, msync calls fsync for the file. For ecryptfs,
fsync just calls the lower level file system's fsync.
Changed the ecryptfs fsync code to call filemap_write_and_wait
before calling the lower level fsync.

Addresses the problem described in http://crbug.com/239536

Signed-off-by: Paul Taysom <taysom@xxxxxxxxxxxx>
fs/ecryptfs/file.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 201f0a0..16f509d 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -295,6 +295,7 @@ static int ecryptfs_release(struct inode *inode, struct file *file)
static int
ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+ filemap_write_and_wait(file->f_mapping);
return vfs_fsync(ecryptfs_file_to_lower(file), datasync);


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