[PATCH 6/8] cifs: implement CIFSQueryMFSymLink()

[Stefan Metzmacher <metze@xxxxxxxxx>]

Signed-off-by: Stefan Metzmacher <metze@xxxxxxxxx>
---
 fs/cifs/link.c |   46 ++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index f7636f9..77f5a40 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -102,10 +102,46 @@ CIFSCreateMFSymLink(const int xid, struct cifsTconInfo *tcon,
 static int
 CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
 		   const unsigned char *searchName, char **symlinkinfo,
-		   const struct nls_table *nls_codepage)
+		   const struct nls_table *nls_codepage, int remap)
 {
-	int rc = -EOPNOTSUPP;
-	return rc;
+	int rc;
+	int oplock = 0;
+	__u16 netfid = 0;
+	u8 buf[CIFS_MF_SYMLINK_FILE_SIZE];
+	char *pbuf = buf;
+	unsigned int bytes_read = 0;
+	int buf_type = CIFS_NO_BUFFER;
+	unsigned int link_len = 0;
+	FILE_ALL_INFO file_info;
+
+	rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
+			 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
+			 nls_codepage, remap);
+	if (rc != 0) {
+		return rc;
+	}
+
+	if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
+		CIFSSMBClose(xid, tcon, netfid);
+		/* it's not a symlink */
+		return -EINVAL;
+	}
+
+	rc = CIFSSMBRead(xid, tcon, netfid,
+			 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
+			 0 /* offset */,
+			 &bytes_read, &pbuf, &buf_type);
+	CIFSSMBClose(xid, tcon, netfid);
+	if (rc != 0) {
+		return rc;
+	}
+
+	rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
+	if (rc != 0) {
+		return rc;
+	}
+
+	return 0;
 }
 
 int
@@ -291,7 +327,9 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 		rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
-					cifs_sb->local_nls);
+					cifs_sb->local_nls,
+					cifs_sb->mnt_cifs_flags &
+						CIFS_MOUNT_MAP_SPECIAL_CHR);
 	else
 		rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
 					     cifs_sb->local_nls);
-- 
1.7.0.4

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