提交 32001d6f 编写于 作者: T Tyler Hicks

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/870326Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Cc: stable@kernel.org [2.6.39+]
上级 b59db43a
......@@ -139,6 +139,27 @@ static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
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,
......
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