cifs: fix broken oplock handling

cifs_new_fileinfo() does not use the 'oplock' value from the callers. Instead,
it sets it to REQ_OPLOCK which seems wrong. We should be using the oplock value
obtained from the Server to set the inode's clientCanCacheAll or
clientCanCacheRead flags. Fix this by passing oplock from the callers to
cifs_new_fileinfo().

This change dates back to commit a6ce4932 (2.6.30-rc3). So, all the affected
versions will need this fix. Please Cc stable once reviewed and accepted.

Cc: Stable <stable@kernel.org>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 9 insertions, 10 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 1d60c655e3e0..f110e0e7e947 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -107,7 +107,8 @@ extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time,
 
 extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode,
                                 __u16 fileHandle, struct file *file,
-                                struct vfsmount *mnt, unsigned int oflags);
+                                struct vfsmount *mnt, unsigned int oflags,
+                                __u32 oplock);
 extern int cifs_posix_open(char *full_path, struct inode **pinode,
                                 struct super_block *sb,
                                 int mode, int oflags,
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index f9ed0751cc12..0f947bf73f8e 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -132,9 +132,9 @@ cifs_bp_rename_retry:
 
 struct cifsFileInfo *
 cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
-                  struct file *file, struct vfsmount *mnt, unsigned int oflags)
+                  struct file *file, struct vfsmount *mnt, unsigned int oflags,
+                  __u32 oplock)
 {
-        int oplock = 0;
         struct cifsFileInfo *pCifsFile;
         struct cifsInodeInfo *pCifsInode;
         struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
@@ -143,9 +143,6 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
         if (pCifsFile == NULL)
                 return pCifsFile;
 
-        if (oplockEnabled)
-                oplock = REQ_OPLOCK;
-
         pCifsFile->netfid = fileHandle;
         pCifsFile->pid = current->tgid;
         pCifsFile->pInode = igrab(newinode);
@@ -468,7 +465,7 @@ cifs_create_set_dentry:
                 }
 
                 pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
-                                               nd->path.mnt, oflags);
+                                               nd->path.mnt, oflags, oplock);
                 if (pfile_info == NULL) {
                         fput(filp);
                         CIFSSMBClose(xid, tcon, fileHandle);
@@ -729,7 +726,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 
                         cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
                                                   nd->path.mnt,
-                                                  nd->intent.open.flags);
+                                                  nd->intent.open.flags,
+                                                  oplock);
                         if (cfile == NULL) {
                                 fput(filp);
                                 CIFSSMBClose(xid, pTcon, fileHandle);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index d33da45fe987..60061b9c2f67 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -277,7 +277,7 @@ int cifs_open(struct inode *inode, struct file *file)
 
                         pCifsFile = cifs_new_fileinfo(inode, netfid, file,
                                                         file->f_path.mnt,
-                                                        oflags);
+                                                        oflags, oplock);
                         if (pCifsFile == NULL) {
                                 CIFSSMBClose(xid, tcon, netfid);
                                 rc = -ENOMEM;
@@ -370,7 +370,7 @@ int cifs_open(struct inode *inode, struct file *file)
                 goto out;
 
         pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
-                                        file->f_flags);
+                                        file->f_flags, oplock);
         if (pCifsFile == NULL) {
                 rc = -ENOMEM;
                 goto out;