Fix oplock handling for CentOS 5.2

sources/centos52/cifsfs.c

@@ -1144,7 +1144,9 @@ static int cifs_oplock_thread(void *dummyarg)
 				    rc = CIFSSMBLock(0, pTcon, netfid, netpid,
 					    0 /* len */ , 0 /* offset */, 0,
 					    0, LOCKING_ANDX_OPLOCK_RELEASE,
-					    0 /* wait flag */);
+					    0 /* wait flag */,
+					    CIFS_I(inode)->clientCanCacheRead ?
+					    1 : 0);
 					cFYI(1, ("Oplock release rc = %d", rc));
 				}
 			} else

sources/centos52/cifsproto.h

@@ -311,7 +311,7 @@ extern int CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 			const __u16 netfid, const __u32 netpid, const __u64 len,
 			const __u64 offset, const __u32 numUnlock,
 			const __u32 numLock, const __u8 lockType,
-			const int waitFlag);
+			const int waitFlag, const __u8 oplock_level);
 extern int CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 			const __u16 smb_file_id, const __u32 netpid, const int get_flag,
 			const __u64 len, struct file_lock *,

sources/centos52/cifssmb.c

@@ -1710,7 +1710,8 @@ int
 CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	    const __u16 smb_file_id, const __u32 net_pid, const __u64 len,
 	    const __u64 offset, const __u32 numUnlock,
-	    const __u32 numLock, const __u8 lockType, const int waitFlag)
+	    const __u32 numLock, const __u8 lockType, const int waitFlag,
+	    const __u8 oplock_level)
 {
 	int rc = 0;
 	LOCK_REQ *pSMB = NULL;
@@ -1740,6 +1741,7 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	pSMB->NumberOfLocks = cpu_to_le16(numLock);
 	pSMB->NumberOfUnlocks = cpu_to_le16(numUnlock);
 	pSMB->LockType = lockType;
+	pSMB->OplockLevel = oplock_level;
 	pSMB->AndXCommand = 0xFF;	/* none */
 	pSMB->Fid = smb_file_id; /* netfid stays le */
 

sources/centos52/file.c

@@ -849,12 +849,12 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 
 		/* BB we could chain these into one lock request BB */
 		rc = CIFSSMBLock(xid, pTcon, netfid, netpid, length, pfLock->fl_start,
-				 0, 1, lockType, 0 /* wait flag */ );
+				 0, 1, lockType, 0 /* wait flag */, 0);
 		if (rc == 0) {
 			rc = CIFSSMBLock(xid, pTcon, netfid, netpid, length,
 					 pfLock->fl_start, 1 /* numUnlock */ ,
 					 0 /* numLock */ , lockType,
-					 0 /* wait flag */ );
+					 0 /* wait flag */, 0);
 			pfLock->fl_type = F_UNLCK;
 			if (rc != 0)
 				cERROR(1, ("Error unlocking previously locked "
@@ -871,13 +871,13 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 				rc = CIFSSMBLock(xid, pTcon, netfid, netpid, length,
 					pfLock->fl_start, 0, 1,
 					lockType | LOCKING_ANDX_SHARED_LOCK,
-					0 /* wait flag */ );
+					0 /* wait flag */, 0);
 				if (rc == 0) {
 					rc = CIFSSMBLock(xid, pTcon, netfid, netpid,
 						length, pfLock->fl_start, 1, 0,
 						lockType |
 						LOCKING_ANDX_SHARED_LOCK,
-						0 /* wait flag */ );
+						0 /* wait flag */, 0);
 					pfLock->fl_type = F_RDLCK;
 					if (rc != 0)
 						cERROR(1, ("Error unlocking "
@@ -920,7 +920,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 		if (numLock) {
 			rc = CIFSSMBLock(xid, pTcon, netfid, netpid, length,
 					pfLock->fl_start,
-					0, numLock, lockType, wait_flag);
+					0, numLock, lockType, wait_flag, 0);
 
 			if (rc == 0) {
 				/* For Windows locks we must store them. */
@@ -942,7 +942,8 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 					stored_rc = CIFSSMBLock(xid, pTcon,
 							netfid, netpid,
 							li->length, li->offset,
-							1, 0, li->type, FALSE);
+							1, 0, li->type, FALSE,
+							0);
 					if (stored_rc)
 						rc = stored_rc;
 					else {