[PATCH 3/4] cifs: have cifsFileInfo hold an extra inode reference

It's possible that this struct will outlive the filp to which it is
attached. If it does and it needs to do some work on the inode, then
it'll need a reference.

Signed-off-by: Jeff Layton <[email protected]>
---
 fs/cifs/cifsglob.h |    4 +++-
 fs/cifs/dir.c      |    2 +-
 fs/cifs/file.c     |    2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b8d673c..908b2de 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -365,8 +365,10 @@ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 /* Release a reference on the file private data */
 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 {
-	if (atomic_dec_and_test(&cifs_file->count))
+	if (atomic_dec_and_test(&cifs_file->count)) {
+		iput(cifs_file->pInode);
 		kfree(cifs_file);
+	}
 }
 
 /*
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index a6424cf..6b45feb 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -147,7 +147,7 @@ cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle,
 
 	pCifsFile->netfid = fileHandle;
 	pCifsFile->pid = current->tgid;
-	pCifsFile->pInode = newinode;
+	pCifsFile->pInode = igrab(newinode);
 	pCifsFile->invalidHandle = false;
 	pCifsFile->closePend = false;
 	mutex_init(&pCifsFile->fh_mutex);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index fa7beac..9498d2c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -50,7 +50,7 @@ static inline struct cifsFileInfo *cifs_init_private(
 	mutex_init(&private_data->lock_mutex);
 	INIT_LIST_HEAD(&private_data->llist);
 	private_data->pfile = file; /* needed for writepage */
-	private_data->pInode = inode;
+	private_data->pInode = igrab(inode);
 	private_data->invalidHandle = false;
 	private_data->closePend = false;
 	/* Initialize reference count to one.  The private data is
-- 
1.6.0.6