cifs: Add comments for DeletePending assignments in open functions

On more places is set DeletePending member to 0. Add comments why is 0 the
correct value. Paths in DELETE_PENDING state cannot be opened by new calls.
So if the newly issued open for that path succeed then it means that the
path cannot be in DELETE_PENDING state.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cifssmb.c

@@ -1163,7 +1163,7 @@ OldOpenRetry:
 				cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
 			pfile_info->EndOfFile = pfile_info->AllocationSize;
 			pfile_info->NumberOfLinks = cpu_to_le32(1);
-			pfile_info->DeletePending = 0;
+			pfile_info->DeletePending = 0; /* successful open = not delete pending */
 		}
 	}
 
@@ -1288,7 +1288,7 @@ openRetry:
 		buf->AllocationSize = rsp->AllocationSize;
 		buf->EndOfFile = rsp->EndOfFile;
 		buf->NumberOfLinks = cpu_to_le32(1);
-		buf->DeletePending = 0;
+		buf->DeletePending = 0; /* successful open = not delete pending */
 	}
 
 	cifs_buf_release(req);

fs/smb/client/smb2inode.c

@@ -676,7 +676,7 @@ finished:
 		idata->fi.EndOfFile = create_rsp->EndofFile;
 		if (le32_to_cpu(idata->fi.NumberOfLinks) == 0)
 			idata->fi.NumberOfLinks = cpu_to_le32(1); /* dummy value */
-		idata->fi.DeletePending = 0;
+		idata->fi.DeletePending = 0; /* successful open = not delete pending */
 		idata->fi.Directory = !!(le32_to_cpu(create_rsp->FileAttributes) & ATTR_DIRECTORY);
 
 		/* smb2_parse_contexts() fills idata->fi.IndexNumber */

fs/smb/client/smb2pdu.c

@@ -3277,7 +3277,7 @@ replay_again:
 		buf->EndOfFile = rsp->EndofFile;
 		buf->Attributes = rsp->FileAttributes;
 		buf->NumberOfLinks = cpu_to_le32(1);
-		buf->DeletePending = 0;
+		buf->DeletePending = 0; /* successful open = not delete pending */
 	}