cifs: change cifs_get_name_from_search_buf to use new unicode helper

...and remove cifs_convertUCSpath. There are no more callers. Also add a
#define for the buffer used in the readdir path so that we don't have so
many magic numbers floating around.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsproto.h

@@ -306,8 +306,6 @@ extern int CIFSGetSrvInodeNumber(const int xid, struct cifsTconInfo *tcon,
 			const unsigned char *searchName, __u64 *inode_number,
 			const struct nls_table *nls_codepage,
 			int remap_special_chars);
-extern int cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,
-			const struct nls_table *codepage);
 extern int cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
 			const struct nls_table *cp, int mapChars);
 

fs/cifs/misc.c

@@ -635,66 +635,6 @@ dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
 	return;
 }
 
-/* Convert 16 bit Unicode pathname from wire format to string in current code
-   page.  Conversion may involve remapping up the seven characters that are
-   only legal in POSIX-like OS (if they are present in the string). Path
-   names are little endian 16 bit Unicode on the wire */
-int
-cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,
-		    const struct nls_table *cp)
-{
-	int i, j, len;
-	__u16 src_char;
-
-	for (i = 0, j = 0; i < maxlen; i++) {
-		src_char = le16_to_cpu(source[i]);
-		switch (src_char) {
-			case 0:
-				goto cUCS_out; /* BB check this BB */
-			case UNI_COLON:
-				target[j] = ':';
-				break;
-			case UNI_ASTERIK:
-				target[j] = '*';
-				break;
-			case UNI_QUESTION:
-				target[j] = '?';
-				break;
-			/* BB We can not handle remapping slash until
-			   all the calls to build_path_from_dentry
-			   are modified, as they use slash as separator BB */
-			/* case UNI_SLASH:
-				target[j] = '\\';
-				break;*/
-			case UNI_PIPE:
-				target[j] = '|';
-				break;
-			case UNI_GRTRTHAN:
-				target[j] = '>';
-				break;
-			case UNI_LESSTHAN:
-				target[j] = '<';
-				break;
-			default:
-				len = cp->uni2char(src_char, &target[j],
-						NLS_MAX_CHARSET_SIZE);
-				if (len > 0) {
-					j += len;
-					continue;
-				} else {
-					target[j] = '?';
-				}
-		}
-		j++;
-		/* make sure we do not overrun callers allocated temp buffer */
-		if (j >= (2 * NAME_MAX))
-			break;
-	}
-cUCS_out:
-	target[j] = 0;
-	return j;
-}
-
 /* Convert 16 bit Unicode pathname to wire format from string in current code
    page.  Conversion may involve remapping up the seven characters that are
    only legal in POSIX-like OS (if they are present in the string). Path

fs/cifs/readdir.c

@@ -31,6 +31,13 @@
 #include "cifs_fs_sb.h"
 #include "cifsfs.h"
 
+/*
+ * To be safe - for UCS to UTF-8 with strings loaded with the rare long
+ * characters alloc more to account for such multibyte target UTF-8
+ * characters.
+ */
+#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
+
 #ifdef CONFIG_CIFS_DEBUG2
 static void dump_cifs_file_struct(struct file *file, char *label)
 {
@@ -881,14 +888,11 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
 	}
 
 	if (unicode) {
-		/* BB fixme - test with long names */
-		/* Note converted filename can be longer than in unicode */
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
-			pqst->len = cifs_convertUCSpath((char *)pqst->name,
-					(__le16 *)filename, len/2, nlt);
-		else
-			pqst->len = cifs_strfromUCS_le((char *)pqst->name,
-					(__le16 *)filename, len/2, nlt);
+		pqst->len = cifs_from_ucs2((char *) pqst->name,
+					   (__le16 *) filename,
+					   UNICODE_NAME_MAX, max_len, nlt,
+					   cifs_sb->mnt_cifs_flags &
+						CIFS_MOUNT_MAP_SPECIAL_CHR);
 	} else {
 		pqst->name = filename;
 		pqst->len = len;
@@ -1070,11 +1074,7 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 				cifsFile->srch_inf.ntwrk_buf_start);
 		end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
 
-		/* To be safe - for UCS to UTF-8 with strings loaded
-		with the rare long characters alloc more to account for
-		such multibyte target UTF-8 characters. cifs_unicode.c,
-		which actually does the conversion, has the same limit */
-		tmp_buf = kmalloc((4 * NAME_MAX) + 2, GFP_KERNEL);
+		tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
 		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
 			if (current_entry == NULL) {
 				/* evaluate whether this case is an error */