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 <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 5 insertions, 3 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 9a7527dc977e..c19419a38f62 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 44f735aa2e3f..36435502b5e8 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 225d127c960e..b976cea24102 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