[linux-cifs-client] F_GETLK request - returning value
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Message ID 200903301001.17229.piastry@etersoft.ru
State New, archived
Headers show

Commit Message

Pavel Shilovsky March 30, 2009, 6:01 a.m. UTC
I have found very stupid bug in my code that I couldn't catch later because I use version of cifs without forcemand option for testing.



Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Acked-by: Jeff Layton <jlayton@redhat.com>

Patch
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diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 8f0f86d..54a6a7f 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1880,8 +1880,21 @@  CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
                }
                parm_data = (struct cifs_posix_lock *)
                        ((char *)&pSMBr->hdr.Protocol + data_offset);
-               if (parm_data->lock_type == cpu_to_le16(CIFS_UNLCK))
+               if (parm_data->lock_type == __constant_cpu_to_le16(CIFS_UNLCK))
                        pLockData->fl_type = F_UNLCK;
+               else {
+                       if (parm_data->lock_type ==
+                                       __constant_cpu_to_le16(CIFS_RDLCK))
+                               pLockData->fl_type = F_RDLCK;
+                       else if (parm_data->lock_type ==
+                                       __constant_cpu_to_le16(CIFS_WRLCK))
+                               pLockData->fl_type = F_WRLCK;
+
+                       pLockData->fl_start = parm_data->start;
+                       pLockData->fl_end = parm_data->start +
+                                               parm_data->length - 1;
+                       pLockData->fl_pid = parm_data->pid;
+               }
        }

 plk_err_exit:
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 6851043..855937e 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -896,8 +896,32 @@  int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)

                } else {
                        /* if rc == ERR_SHARING_VIOLATION ? */
-                       rc = 0; /* do not change lock type to unlock
-                                  since range in use */
+                       rc = 0;
+
+                       if (lockType & LOCKING_ANDX_SHARED_LOCK) {
+                               pfLock->fl_type = F_WRLCK;
+                       } else {
+                               rc = CIFSSMBLock(xid, pTcon, netfid, length,
+                                       pfLock->fl_start, 0, 1,
+                                       lockType | LOCKING_ANDX_SHARED_LOCK,
+                                       0 /* wait flag */ );
+                               if (rc == 0) {
+                                       rc = CIFSSMBLock(xid, pTcon, netfid,
+                                               length, pfLock->fl_start, 1, 0,
+                                               lockType |
+                                               LOCKING_ANDX_SHARED_LOCK,
+                                               0 /* wait flag */ );
+                                       pfLock->fl_type = F_RDLCK;
+                                       if (rc != 0)
+                                               cERROR(1, ("Error unlocking "
+                                               "previously locked range %d "
+                                               "during test of lock", rc));
+                                       rc = 0;
+                               } else {
+                                       pfLock->fl_type = F_WRLCK;
+                                       rc = 0;
+                               }
+                       }
                }

                FreeXid(xid);