eCryptfs: Flush file in vma close

Dirty pages weren't being written back when an mmap'ed eCryptfs file was
closed before the mapping was unmapped. Since f_ops->flush() is not
called by the munmap() path, the lower file was simply being released.
This patch flushes the eCryptfs file in the vm_ops->close() path.

https://launchpad.net/bugs/870326

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: stable@kernel.org [2.6.39+]

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index c6ac98cf9baaeca5d898cce216aa0dc08df2716c..d3f95f941c47e68a1d0a2cbe60371f148d64e124 100644 (file)
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -139,6 +139,27 @@ out:
        return rc;
 }
 
+static void ecryptfs_vma_close(struct vm_area_struct *vma)
+{
+       filemap_write_and_wait(vma->vm_file->f_mapping);
+}
+
+static const struct vm_operations_struct ecryptfs_file_vm_ops = {
+       .close          = ecryptfs_vma_close,
+       .fault          = filemap_fault,
+};
+
+static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+       int rc;
+
+       rc = generic_file_mmap(file, vma);
+       if (!rc)
+               vma->vm_ops = &ecryptfs_file_vm_ops;
+
+       return rc;
+}
+
 struct kmem_cache *ecryptfs_file_info_cache;
 
 /**
@@ -349,7 +370,7 @@ const struct file_operations ecryptfs_main_fops = {
 #ifdef CONFIG_COMPAT
        .compat_ioctl = ecryptfs_compat_ioctl,
 #endif
-       .mmap = generic_file_mmap,
+       .mmap = ecryptfs_file_mmap,
        .open = ecryptfs_open,
        .flush = ecryptfs_flush,
        .release = ecryptfs_release,