Fix oplock handling for CentOS 5.5

sources/centos55/cifsproto.h

@@ -338,9 +338,10 @@ extern int cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
 			const struct nls_table *cp, int mapChars);
 
 extern int CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
-			const __u16 netfid, const __u64 len, const __u64 offset,
-			const __u32 numUnlock, const __u32 numLock,
-			const __u8 lockType, const bool waitFlag);
+			const __u16 netfid, const __u64 len,
+			const __u64 offset, const __u32 numUnlock,
+			const __u32 numLock, const __u8 lockType,
+			const bool waitFlag, const __u8 oplock_level);
 extern int CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 			const __u16 smb_file_id, const int get_flag,
 			const __u64 len, struct file_lock *,

sources/centos55/cifssmb.c

@@ -1711,9 +1711,10 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
 
 int
 CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
-	    const __u16 smb_file_id, const __u64 len, const __u64 offset,
-	    const __u32 numUnlock, const __u32 numLock, const __u8 lockType,
-	    const bool waitFlag)
+	    const __u16 smb_file_id, const __u64 len,
+	    const __u64 offset, const __u32 numUnlock,
+	    const __u32 numLock, const __u8 lockType,
+	    const bool waitFlag, const __u8 oplock_level)
 {
 	int rc = 0;
 	LOCK_REQ *pSMB = NULL;
@@ -1741,6 +1742,7 @@ 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/centos55/file.c

@@ -902,12 +902,12 @@ 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, tcon, netfid, length, pfLock->fl_start,
-				 0, 1, lockType, 0 /* wait flag */ );
+				 0, 1, lockType, 0 /* wait flag */, 0);
 		if (rc == 0) {
 			rc = CIFSSMBLock(xid, tcon, netfid, 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 "
@@ -924,13 +924,13 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 				rc = CIFSSMBLock(xid, tcon, netfid, length,
 					pfLock->fl_start, 0, 1,
 					lockType | LOCKING_ANDX_SHARED_LOCK,
-					0 /* wait flag */ );
+					0 /* wait flag */, 0);
 				if (rc == 0) {
 					rc = CIFSSMBLock(xid, tcon, netfid,
 						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 "
@@ -975,7 +975,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 		if (numLock) {
 			rc = CIFSSMBLock(xid, tcon, netfid, length,
 					 pfLock->fl_start, 0, numLock, lockType,
-					 wait_flag);
+					 wait_flag, 0);
 
 			if (rc == 0) {
 				/* For Windows locks we must store them. */
@@ -997,7 +997,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 					stored_rc = CIFSSMBLock(xid, tcon,
 							netfid, li->length,
 							li->offset, 1, 0,
-							li->type, false);
+							li->type, false, 0);
 					if (stored_rc)
 						rc = stored_rc;
 					else {
@@ -2559,7 +2559,8 @@ cifs_oplock_break(void *data)
 	 */
 	if (!cfile->closePend && !cfile->oplock_break_cancelled) {
 		rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0,
-				 LOCKING_ANDX_OPLOCK_RELEASE, false);
+				 LOCKING_ANDX_OPLOCK_RELEASE, false,
+				 cinode->clientCanCacheRead ? 1 : 0);
 		cFYI(1, ("Oplock release rc = %d", rc));
 	}