5 files changed, 42 insertions, 7 deletions

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 1a27ecb46c9a..dfd364c66313 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,3 +1,8 @@
+Version 1.43
+------------
+POSIX locking to servers which support CIFS POSIX Extensions
+(disabled by default controlled by proc/fs/cifs/Experimental)
+
 Version 1.42
 ------------
 Fix slow oplock break when mounted to different servers at the same time and
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 4e829dc672a6..c98755dca868 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -99,5 +99,5 @@ extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t  cifs_listxattr(struct dentry *, char *, size_t);
 extern int cifs_ioctl (struct inode * inode, struct file * filep,
                        unsigned int command, unsigned long arg);
-#define CIFS_VERSION   "1.42"
+#define CIFS_VERSION   "1.43"
 #endif                          /* _CIFSFS_H */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 2879ba343ca7..310ea2f0e0bf 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -267,7 +267,7 @@ extern int CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
                         const int waitFlag);
 extern int CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
                         const __u16 smb_file_id, const int get_flag,
-                        const __u64 len, const __u64 offset, 
+                        const __u64 len, struct file_lock *, 
                         const __u16 lock_type, const int waitFlag);
 extern int CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon);
 extern int CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index fd36892eda55..20d5e748f41e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1355,7 +1355,8 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 int
 CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
                 const __u16 smb_file_id, const int get_flag, const __u64 len,
-                const __u64 lkoffset, const __u16 lock_type, const int waitFlag)
+                struct file_lock *pLockData, const __u16 lock_type, 
+                const int waitFlag)
 {
         struct smb_com_transaction2_sfi_req *pSMB  = NULL;
         struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
@@ -1366,6 +1367,10 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
         __u16 params, param_offset, offset, byte_count, count;
 
         cFYI(1, ("Posix Lock"));
+
+        if(pLockData == NULL)
+                return EINVAL;
+
         rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
 
         if (rc)
@@ -1406,7 +1411,7 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
         if(waitFlag)
                 parm_data->lock_flags = 1;
         parm_data->pid = cpu_to_le32(current->tgid);
-        parm_data->start = lkoffset;
+        parm_data->start = cpu_to_le64(pLockData->fl_start);
         parm_data->length = len;  /* normalize negative numbers */
 
         pSMB->DataOffset = cpu_to_le16(offset);
@@ -1419,8 +1424,33 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
         if (rc) {
                 cFYI(1, ("Send error in Posix Lock = %d", rc));
-        }
+        } else if (get_flag) {
+                /* lock structure can be returned on get */
+                __u16 data_offset;
+                __u16 data_count;
+                rc = validate_t2((struct smb_t2_rsp *)pSMBr);
 
+                if (rc || (pSMBr->ByteCount < sizeof(struct cifs_posix_lock))) {
+                        rc = -EIO;      /* bad smb */
+                        goto plk_err_exit;
+                }
+                if(pLockData == NULL) {
+                        rc = -EINVAL;
+                        goto plk_err_exit;
+                }
+                data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+                data_count  = le16_to_cpu(pSMBr->t2.DataCount);
+                if(data_count < sizeof(struct cifs_posix_lock)) {
+                        rc = -EIO;
+                        goto plk_err_exit;
+                }
+                parm_data = (struct cifs_posix_lock *)
+                        ((char *)&pSMBr->hdr.Protocol + data_offset);
+                if(parm_data->lock_type == cpu_to_le16(CIFS_UNLCK))
+                        pLockData->fl_type = F_UNLCK;
+        }
+ 
+plk_err_exit:
         if (pSMB)
                 cifs_small_buf_release(pSMB);
 
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e152bf6afa60..7ef30efe8f98 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -656,7 +656,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
                         else
                                 posix_lock_type = CIFS_WRLCK;
                         rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
-                                        length, pfLock->fl_start,
+                                        length, pfLock,
                                         posix_lock_type, wait_flag);
                         FreeXid(xid);
                         return rc;
@@ -704,7 +704,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
                         return -EOPNOTSUPP;
                 }
                 rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
-                                      length, pfLock->fl_start,
+                                      length, pfLock,
                                       posix_lock_type, wait_flag);
         } else
                 rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,