Add reflink copy over SMB3.11 with new FSCTL_DUPLICATE_EXTENTS

[firefly-linux-kernel-4.4.55.git] / fs / cifs / smb2ops.c

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index c7d228c4006ab56fc4272d96bf559a6cc335cbec..b1e9c0f1b24c413e561660ab7fcfcb5fdab31b72 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -806,6 +806,53 @@ smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
                            cfile->fid.volatile_fid, cfile->pid, &eof, false);
 }
 
+#ifdef CONFIG_CIFS_SMB311
+static int
+smb2_duplicate_extents(const unsigned int xid,
+                       struct cifsFileInfo *srcfile,
+                       struct cifsFileInfo *trgtfile, u64 src_off,
+                       u64 len, u64 dest_off)
+{
+       int rc;
+       unsigned int ret_data_len;
+       char *retbuf = NULL;
+       struct duplicate_extents_to_file dup_ext_buf;
+       struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
+
+       /* server fileays advertise duplicate extent support with this flag */
+       if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
+            FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
+               return -EOPNOTSUPP;
+
+       dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
+       dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
+       dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
+       dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
+       dup_ext_buf.ByteCount = cpu_to_le64(len);
+       cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
+               src_off, dest_off, len);
+
+       rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
+       if (rc)
+               goto duplicate_extents_out;
+
+       rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
+                       trgtfile->fid.volatile_fid,
+                       FSCTL_DUPLICATE_EXTENTS_TO_FILE,
+                       true /* is_fsctl */, (char *)&dup_ext_buf,
+                       sizeof(struct duplicate_extents_to_file),
+                       (char **)&retbuf,
+                       &ret_data_len);
+
+       if (ret_data_len > 0)
+               cifs_dbg(FYI, "non-zero response length in duplicate extents");
+
+duplicate_extents_out:
+       return rc;
+}
+#endif /* CONFIG_CIFS_SMB311 */
+
+
 static int
 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
                   struct cifsFileInfo *cfile)
@@ -1714,6 +1761,7 @@ struct smb_version_operations smb311_operations = {
        .create_lease_buf = smb3_create_lease_buf,
        .parse_lease_buf = smb3_parse_lease_buf,
        .clone_range = smb2_clone_range,
+       .duplicate_extents = smb2_duplicate_extents,
 /*     .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
        .wp_retry_size = smb2_wp_retry_size,
        .dir_needs_close = smb2_dir_needs_close,