cifs: implement CIFSQueryMFSymLink()

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index bec212b09a02ff36a79b7b4e186412a8d2bb5d2e..6e4e8957595d19a124ac1dbab468e407cbf49737 100644 (file)
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -91,6 +91,56 @@ CIFSParseMFSymlink(const u8 *buf,
        return 0;
 }
 
+static int
+CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
+                  const unsigned char *searchName, char **symlinkinfo,
+                  const struct nls_table *nls_codepage, int remap)
+{
+       int rc;
+       int oplock = 0;
+       __u16 netfid = 0;
+       u8 *buf;
+       char *pbuf;
+       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;
+       }
+
+       buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+       pbuf = buf;
+
+       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) {
+               kfree(buf);
+               return rc;
+       }
+
+       rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
+       kfree(buf);
+       if (rc != 0)
+               return rc;
+
+       return 0;
+}
+
 bool
 CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
 {