[PATCH 3/4] cifs: use cifs_dirent to replace cifs_get_name_from_search_buf

[Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>]

This allows us to parse the on the wire structures only once in
cifs_filldir.

Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>

Index: linux-2.6/fs/cifs/readdir.c
===================================================================
--- linux-2.6.orig/fs/cifs/readdir.c	2011-05-22 13:32:40.456945333 +0200
+++ linux-2.6/fs/cifs/readdir.c	2011-05-22 13:33:38.060010807 +0200
@@ -656,82 +656,6 @@ static int find_cifs_entry(const int xid
 	return rc;
 }
 
-/* inode num, inode type and filename returned */
-static int cifs_get_name_from_search_buf(struct qstr *pqst,
-	char *current_entry, __u16 level, unsigned int unicode,
-	struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum)
-{
-	int rc = 0;
-	unsigned int len = 0;
-	char *filename;
-	struct nls_table *nlt = cifs_sb->local_nls;
-
-	*pinum = 0;
-
-	if (level == SMB_FIND_FILE_UNIX) {
-		FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
-
-		filename = &pFindData->FileName[0];
-		if (unicode) {
-			len = cifs_unicode_bytelen(filename);
-		} else {
-			/* BB should we make this strnlen of PATH_MAX? */
-			len = strnlen(filename, PATH_MAX);
-		}
-
-		*pinum = le64_to_cpu(pFindData->basic.UniqueId);
-	} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
-		FILE_DIRECTORY_INFO *pFindData =
-			(FILE_DIRECTORY_INFO *)current_entry;
-		filename = &pFindData->FileName[0];
-		len = le32_to_cpu(pFindData->FileNameLength);
-	} else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
-		FILE_FULL_DIRECTORY_INFO *pFindData =
-			(FILE_FULL_DIRECTORY_INFO *)current_entry;
-		filename = &pFindData->FileName[0];
-		len = le32_to_cpu(pFindData->FileNameLength);
-	} else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
-		SEARCH_ID_FULL_DIR_INFO *pFindData =
-			(SEARCH_ID_FULL_DIR_INFO *)current_entry;
-		filename = &pFindData->FileName[0];
-		len = le32_to_cpu(pFindData->FileNameLength);
-		*pinum = le64_to_cpu(pFindData->UniqueId);
-	} else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
-		FILE_BOTH_DIRECTORY_INFO *pFindData =
-			(FILE_BOTH_DIRECTORY_INFO *)current_entry;
-		filename = &pFindData->FileName[0];
-		len = le32_to_cpu(pFindData->FileNameLength);
-	} else if (level == SMB_FIND_FILE_INFO_STANDARD) {
-		FIND_FILE_STANDARD_INFO *pFindData =
-			(FIND_FILE_STANDARD_INFO *)current_entry;
-		filename = &pFindData->FileName[0];
-		/* one byte length, no name conversion */
-		len = (unsigned int)pFindData->FileNameLength;
-	} else {
-		cFYI(1, "Unknown findfirst level %d", level);
-		return -EINVAL;
-	}
-
-	if (len > max_len) {
-		cERROR(1, "bad search response length %d past smb end", len);
-		return -EINVAL;
-	}
-
-	if (unicode) {
-		pqst->len = cifs_from_ucs2((char *) pqst->name,
-					   (__le16 *) filename,
-					   UNICODE_NAME_MAX,
-					   min(len, max_len), nlt,
-					   cifs_sb->mnt_cifs_flags &
-						CIFS_MOUNT_MAP_SPECIAL_CHR);
-		pqst->len -= nls_nullsize(nlt);
-	} else {
-		pqst->name = filename;
-		pqst->len = len;
-	}
-	return rc;
-}
-
 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
 		void *dirent, char *scratch_buf, unsigned int max_len)
 {
@@ -743,7 +667,6 @@ static int cifs_filldir(char *find_entry
 	struct dentry *dentry;
 	struct qstr name;
 	int rc = 0;
-	u64 inum;
 	ino_t ino;
 
 	rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
@@ -751,17 +674,31 @@ static int cifs_filldir(char *find_entry
 	if (rc)
 		return rc;
 
+	if (de.namelen > max_len) {
+		cERROR(1, "bad search response length %zd past smb end",
+			  de.namelen);
+		return -EINVAL;
+	}
+
 	/* skip . and .. since we added them first */
 	if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
 		return 0;
 
-	name.name = scratch_buf;
-	rc = cifs_get_name_from_search_buf(&name, find_entry,
-					   file_info->srch_inf.info_level,
-					   file_info->srch_inf.unicode,
-					   cifs_sb, max_len, &inum);
-	if (rc)
-		return rc;
+	if (file_info->srch_inf.unicode) {
+		struct nls_table *nlt = cifs_sb->local_nls;
+
+		name.name = scratch_buf;
+		name.len =
+			cifs_from_ucs2((char *)name.name, (__le16 *)de.name,
+				       UNICODE_NAME_MAX,
+				       min(de.namelen, (size_t)max_len), nlt,
+				       cifs_sb->mnt_cifs_flags &
+					       	CIFS_MOUNT_MAP_SPECIAL_CHR);
+		name.len -= nls_nullsize(nlt);
+	} else {
+		name.name = de.name;
+		name.len = de.namelen;
+	}
 
 	switch (file_info->srch_inf.info_level) {
 	case SMB_FIND_FILE_UNIX:
@@ -781,8 +718,8 @@ static int cifs_filldir(char *find_entry
 		break;
 	}
 
-	if (inum && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
-		fattr.cf_uniqueid = inum;
+	if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+		fattr.cf_uniqueid = de.ino;
 	} else {
 		fattr.cf_uniqueid = iunique(sb, ROOT_I);
 		cifs_autodisable_serverino(cifs_sb);