CIFS: Add SMB2 support for is_path_accessible

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / cifs / smb2ops.c

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 0e33ca32abf99ca0e7fce6ead480df8453bb659c..1266137406fa1078b932aab6fd5a9ac7f14d37dd 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -157,6 +157,30 @@ smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
        return rc;
 }
 
+static int
+smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
+                       struct cifs_sb_info *cifs_sb, const char *full_path)
+{
+       int rc;
+       __u64 persistent_fid, volatile_fid;
+       __le16 *utf16_path;
+
+       utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+       if (!utf16_path)
+               return -ENOMEM;
+
+       rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
+                      FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
+       if (rc) {
+               kfree(utf16_path);
+               return rc;
+       }
+
+       rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
+       kfree(utf16_path);
+       return rc;
+}
+
 struct smb_version_operations smb21_operations = {
        .setup_request = smb2_setup_request,
        .check_receive = smb2_check_receive,
@@ -174,6 +198,7 @@ struct smb_version_operations smb21_operations = {
        .logoff = SMB2_logoff,
        .tree_connect = SMB2_tcon,
        .tree_disconnect = SMB2_tdis,
+       .is_path_accessible = smb2_is_path_accessible,
 };
 
 struct smb_version_values smb21_values = {