drive: add docs for --fast-list and add to integration tests

docs/content/drive.md

@@ -312,6 +312,45 @@ d) Delete this remote
 y/e/d> y
 ```
 
+### --fast-list ###
+
+This remote supports `--fast-list` which allows you to use fewer
+transactions in exchange for more memory. See the [rclone
+docs](/docs/#fast-list) for more details.
+
+It does this by combining multiple `list` calls into a single API request.
+
+This works by combining many `'%s' in parents` filters into one expression.
+To list the contents of directories a, b and c, the the following requests will be send by the regular `List` function:
+```
+trashed=false and 'a' in parents
+trashed=false and 'b' in parents
+trashed=false and 'c' in parents
+```
+These can now be combined into a single request:
+```
+trashed=false and ('a' in parents or 'b' in parents or 'c' in parents)
+```
+
+The implementation of `ListR` will put up to 50 `parents` filters into one request.
+It will  use the `--checkers` value to specify the number of requests to run in parallel.
+
+In tests, these batch requests were up to 20x faster than the regular method.
+Running the following command against different sized folders gives:
+```
+rclone lsjson -vv -R --checkers=6 gdrive:folder
+```
+
+small folder (220 directories, 700 files):
+
+- without `--fast-list`: 38s
+- with `--fast-list`: 10s
+
+large folder (10600 directories, 39000 files):
+
+- without `--fast-list`: 22:05 min
+- with `--fast-list`: 58s
+
 ### Modified time ###
 
 Google drive stores modification times accurate to 1 ms.

docs/content/overview.md

@@ -134,7 +134,7 @@ operations more efficient.
 | Dropbox                      | Yes   | Yes  | Yes  | Yes     | No [#575](https://github.com/ncw/rclone/issues/575) | No  | Yes | Yes | Yes |
 | FTP                          | No    | No   | Yes  | Yes     | No      | No    | Yes          | No [#2178](https://github.com/ncw/rclone/issues/2178) | No  |
 | Google Cloud Storage         | Yes   | Yes  | No   | No      | No      | Yes   | Yes          | No [#2178](https://github.com/ncw/rclone/issues/2178) | No  |
-| Google Drive                 | Yes   | Yes  | Yes  | Yes     | Yes     | No    | Yes          | Yes         | Yes |
+| Google Drive                 | Yes   | Yes  | Yes  | Yes     | Yes     | Yes   | Yes          | Yes         | Yes |
 | HTTP                         | No    | No   | No   | No      | No      | No    | No           | No [#2178](https://github.com/ncw/rclone/issues/2178) | No  |
 | Hubic                        | Yes † | Yes  | No   | No      | No      | Yes   | Yes          | No [#2178](https://github.com/ncw/rclone/issues/2178) | Yes |
 | Mega                         | Yes   | No   | Yes  | Yes     | No      | No    | No           | No [#2178](https://github.com/ncw/rclone/issues/2178) | Yes |

fstest/test_all/test_all.go

@@ -45,7 +45,7 @@ var (
 		{
 			Name:     "TestCryptDrive:",
 			SubDir:   false,
-			FastList: false,
+			FastList: true,
 		},
 		{
 			Name:     "TestCryptSwift:",
@@ -55,7 +55,7 @@ var (
 		{
 			Name:     "TestDrive:",
 			SubDir:   false,
-			FastList: false,
+			FastList: true,
 		},
 		{
 			Name:     "TestDropbox:",