afs: Flush outstanding writes when an fd is closed

Flush outstanding writes in afs when an fd is closed.  This is what NFS and
CIFS do.

Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/fs/afs/file.c b/fs/afs/file.c
index a38e1c3..b582944 100644 (file)
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -30,6 +30,7 @@ static int afs_readpages(struct file *filp, struct address_space *mapping,
 
 const struct file_operations afs_file_operations = {
        .open           = afs_open,
+       .flush          = afs_flush,
        .release        = afs_release,
        .llseek         = generic_file_llseek,
        .read_iter      = generic_file_read_iter,

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index dc2cb48..af1d91e 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -720,6 +720,7 @@ extern int afs_writepages(struct address_space *, struct writeback_control *);
 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
 extern int afs_writeback_all(struct afs_vnode *);
+extern int afs_flush(struct file *, fl_owner_t);
 extern int afs_fsync(struct file *, loff_t, loff_t, int);
 
 

diff --git a/fs/afs/write.c b/fs/afs/write.c
index ea66890..f1450ea 100644 (file)
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -757,6 +757,20 @@ out:
        return ret;
 }
 
+/*
+ * Flush out all outstanding writes on a file opened for writing when it is
+ * closed.
+ */
+int afs_flush(struct file *file, fl_owner_t id)
+{
+       _enter("");
+
+       if ((file->f_mode & FMODE_WRITE) == 0)
+               return 0;
+
+       return vfs_fsync(file, 0);
+}
+
 /*
  * notification that a previously read-only page is about to become writable
  * - if it returns an error, the caller will deliver a bus error signal