um: hostfs: Fix writeback
We have to implement ->release() and trigger writeback from it.
Otherwise we might lose dirty pages at munmap().
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index cddb052..2543728 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -361,6 +361,13 @@
return 0;
}
+static int hostfs_file_release(struct inode *inode, struct file *file)
+{
+ filemap_write_and_wait(inode->i_mapping);
+
+ return 0;
+}
+
int hostfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
struct inode *inode = file->f_mapping->host;
@@ -386,7 +393,7 @@
.write = do_sync_write,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
- .release = NULL,
+ .release = hostfs_file_release,
.fsync = hostfs_fsync,
};