[CIFS] Recognize properly symlinks and char/blk devices (not just FIFOs)

created by SFU (part 1 of 2).

Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

@@ -3,6 +3,8 @@ Version 1.39
 Defer close of a file handle slightly if pending writes depend on that file handle
 (this reduces the EBADF bad file handle errors that can be logged under heavy
 stress on writes). Modify cifs Kconfig options to expose CONFIG_CIFS_STATS2 
+Fix SFU style symlinks and mknod needed for servers which do not support the CIFS
+Unix Extensions.
 
 Version 1.38
 ------------

fs/cifs/inode.c

@@ -97,9 +97,9 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 		inode = *pinode;
 		cifsInfo = CIFS_I(inode);
 
-		cFYI(1, (" Old time %ld ", cifsInfo->time));
+		cFYI(1, ("Old time %ld ", cifsInfo->time));
 		cifsInfo->time = jiffies;
-		cFYI(1, (" New time %ld ", cifsInfo->time));
+		cFYI(1, ("New time %ld ", cifsInfo->time));
 		/* this is ok to set on every inode revalidate */
 		atomic_set(&cifsInfo->inUse,1);
 
@@ -195,6 +195,55 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 	return rc;
 }
 
+static int decode_sfu_inode(struct inode * inode, __u64 size,
+			    const unsigned char *path,
+			    struct cifs_sb_info *cifs_sb, int xid)
+{
+	int rc;
+	int oplock = FALSE;
+	__u16 netfid;
+	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	char buf[8];
+	unsigned int bytes_read;
+	char * pbuf;
+
+	pbuf = buf;
+
+	if(size == 0) {
+		inode->i_mode |= S_IFIFO;
+		return 0;
+	} else if (size < 8) {
+		return -EINVAL;	 /* EOPNOTSUPP? */
+	}
+
+	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
+			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
+			 cifs_sb->local_nls,
+			 cifs_sb->mnt_cifs_flags &
+				CIFS_MOUNT_MAP_SPECIAL_CHR);
+	if (rc==0) {
+			/* Read header */
+		rc = CIFSSMBRead(xid, pTcon,
+			         netfid,
+				 8 /* length */, 0 /* offset */,
+				 &bytes_read, &pbuf);
+		if((rc == 0) && (bytes_read == 8)) {
+			/* if memcmp(IntxCHR\000, pbuf, 8)
+			   else if memcmp(IntxBLK\000, pbuf, 8)
+			   else if memcmp(IntxLNK\001, pbuf, 8) */
+		}
+
+		CIFSSMBClose(xid, pTcon, netfid);
+
+
+	/* inode->i_rdev = MKDEV(le64_to_cpu(DevMajor),
+                            le64_to_cpu(DevMinor) & MINORMASK);*/
+/*	inode->i_mode |= S_IFBLK; */
+	}
+	return rc;
+
+}
+
 int cifs_get_inode_info(struct inode **pinode,
 	const unsigned char *search_path, FILE_ALL_INFO *pfindData,
 	struct super_block *sb, int xid)
@@ -207,7 +256,7 @@ int cifs_get_inode_info(struct inode **pinode,
 	char *buf = NULL;
 
 	pTcon = cifs_sb->tcon;
-	cFYI(1,("Getting info on %s ", search_path));
+	cFYI(1,("Getting info on %s", search_path));
 
 	if ((pfindData == NULL) && (*pinode != NULL)) {
 		if (CIFS_I(*pinode)->clientCanCacheRead) {
@@ -345,10 +394,15 @@ int cifs_get_inode_info(struct inode **pinode,
 			   (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) && ) */
-
+/* BB Finish for SFU style symlinks and devices */
+		} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+			   (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
+			if (decode_sfu_inode(inode, 
+					 le64_to_cpu(pfindData->EndOfFile),
+					 search_path,
+					 cifs_sb, xid)) {
+				cFYI(1,("Unrecognized sfu inode type"));
+			}
 		} else {
 			inode->i_mode |= S_IFREG;
 			/* treat the dos attribute of read-only as read-only
@@ -382,7 +436,7 @@ int cifs_get_inode_info(struct inode **pinode,
 		}
 
 		if (S_ISREG(inode->i_mode)) {
-			cFYI(1, (" File inode "));
+			cFYI(1, ("File inode"));
 			inode->i_op = &cifs_file_inode_ops;
 			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 				if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
@@ -400,11 +454,11 @@ int cifs_get_inode_info(struct inode **pinode,
 			     4096 + MAX_CIFS_HDR_SIZE)
 				inode->i_data.a_ops->readpages = NULL;
 		} else if (S_ISDIR(inode->i_mode)) {
-			cFYI(1, (" Directory inode "));
+			cFYI(1, ("Directory inode"));
 			inode->i_op = &cifs_dir_inode_ops;
 			inode->i_fop = &cifs_dir_ops;
 		} else if (S_ISLNK(inode->i_mode)) {
-			cFYI(1, (" Symbolic Link inode "));
+			cFYI(1, ("Symbolic Link inode"));
 			inode->i_op = &cifs_symlink_inode_ops;
 		} else {
 			init_special_inode(inode, inode->i_mode,