[CIFS] Add compat with SFU (part 2)

Creating FIFOs to non-Unix servers (with cifs mounts for which sfu option
was specified) now works.

Signed-off-by: Steve French (sfrench@us.ibm.com)

Thanks to Martin Koeppe for his assistance

fs/cifs/cifspdu.h

@@ -268,10 +268,18 @@
 /* CreateOptions */
 #define CREATE_NOT_FILE		0x00000001	/* if set must not be file */
 #define CREATE_WRITE_THROUGH	0x00000002
-#define CREATE_NOT_DIR		0x00000040	/* if set must not be directory */
+#define CREATE_SEQUENTIAL       0x00000004
+#define CREATE_SYNC_ALERT       0x00000010
+#define CREATE_ASYNC_ALERT      0x00000020
+#define CREATE_NOT_DIR		0x00000040    /* if set must not be directory */
+#define CREATE_NO_EA_KNOWLEDGE  0x00000200
+#define CREATE_EIGHT_DOT_THREE  0x00000400
 #define CREATE_RANDOM_ACCESS	0x00000800
 #define CREATE_DELETE_ON_CLOSE	0x00001000
+#define CREATE_OPEN_BY_ID       0x00002000
 #define OPEN_REPARSE_POINT	0x00200000
+#define CREATE_OPTIONS_MASK     0x007FFFFF 
+#define CREATE_OPTION_SPECIAL   0x20000000   /* system. NB not sent over wire */
 
 /* ImpersonationLevel flags */
 #define SECURITY_ANONYMOUS      0

fs/cifs/cifssmb.c

@@ -738,7 +738,13 @@ openRetry:
 	}
 	pSMB->DesiredAccess = cpu_to_le32(access_flags);
 	pSMB->AllocationSize = 0;
-	pSMB->FileAttributes = cpu_to_le32(ATTR_NORMAL);
+	/* set file as system file if special file such
+	   as fifo and server expecting SFU style and
+	   no Unix extensions */
+	if(create_options & CREATE_OPTION_SPECIAL)
+		pSMB->FileAttributes = cpu_to_le32(ATTR_SYSTEM);
+	else
+		pSMB->FileAttributes = cpu_to_le32(ATTR_NORMAL);
 	/* XP does not handle ATTR_POSIX_SEMANTICS */
 	/* but it helps speed up case sensitive checks for other
 	servers such as Samba */
@@ -752,7 +758,7 @@ openRetry:
 		being created */
 	pSMB->ShareAccess = cpu_to_le32(FILE_SHARE_ALL);
 	pSMB->CreateDisposition = cpu_to_le32(openDisposition);
-	pSMB->CreateOptions = cpu_to_le32(create_options);
+	pSMB->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
 	/* BB Expirement with various impersonation levels and verify */
 	pSMB->ImpersonationLevel = cpu_to_le32(SECURITY_IMPERSONATION);
 	pSMB->SecurityFlags =

fs/cifs/dir.c

@@ -327,13 +327,39 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t dev
 				d_instantiate(direntry, newinode);
 		}
 	} else {
-		if((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && 
-			(special_file(mode))) {
+		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+			int oplock = 0;
+			u16 fileHandle;
+			FILE_ALL_INFO * buf;
 
 			cFYI(1,("sfu compat create special file"));
-			/*	Attributes = cpu_to_le32(ATTR_SYSTEM); 
-				rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, ...); */
 
+			buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
+			if(buf == NULL) {
+				kfree(full_path);
+				FreeXid(xid);
+				return -ENOMEM;
+			}
+
+			rc = CIFSSMBOpen(xid, pTcon, full_path,
+					 FILE_CREATE, /* fail if exists */
+					 GENERIC_WRITE /* BB would 
+					  WRITE_OWNER | WRITE_DAC be better? */,
+					 /* Create a file and set the
+					    file attribute to SYSTEM */
+					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
+					 &fileHandle, &oplock, buf,
+					 cifs_sb->local_nls,
+					 cifs_sb->mnt_cifs_flags & 
+					    CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+			if(!rc) {
+				/* BB Do not bother to decode buf since no
+				   local inode yet to put timestamps in */
+				CIFSSMBClose(xid, pTcon, fileHandle);
+				d_drop(direntry);
+			}
+			kfree(buf);
 			/* add code here to set EAs */
 		}
 	}

fs/cifs/inode.c

@@ -320,6 +320,16 @@ int cifs_get_inode_info(struct inode **pinode,
 		   on dirs */
 			inode->i_mode = cifs_sb->mnt_dir_mode;
 			inode->i_mode |= S_IFDIR;
+		} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+			   (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
+			   /* No need to le64 convert size of zero */
+			   (pfindData->EndOfFile == 0)) {
+			inode->i_mode = cifs_sb->mnt_file_mode;
+			inode->i_mode |= S_IFIFO;
+/* BB Finish for SFU style symlinks and devies */
+/*		} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+			   (cifsInfo->cifsAttrs & ATTR_SYSTEM) && ) */
+
 		} else {
 			inode->i_mode |= S_IFREG;
 			/* treat the dos attribute of read-only as read-only

fs/cifs/readdir.c

@@ -148,6 +148,13 @@ static void fill_in_inode(struct inode *tmp_inode,
 			tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 		}
 		tmp_inode->i_mode |= S_IFDIR;
+	} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && 
+		   (attr & ATTR_SYSTEM) && (end_of_file == 0)) {
+		*pobject_type = DT_FIFO;
+		tmp_inode->i_mode |= S_IFIFO;
+/* BB Finish for SFU style symlinks and devies */
+/*	} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+		(attr & ATTR_SYSTEM) && ) { */
 /* we no longer mark these because we could not follow them */
 /*        } else if (attr & ATTR_REPARSE) {
                 *pobject_type = DT_LNK;