[PATCH 5 of 7 flagprocessor v7] revlog: REVIDX_EXTSTORED flag

[Remi Chaintron]

# HG changeset patch
# User Remi Chaintron <remi at fb.com>
# Date 1482451803 18000
#      Thu Dec 22 19:10:03 2016 -0500
# Node ID 8a72e38f826c86f2a9ede795198a016c330734de
# Parent  c59965f26abba42afccd05881c5f3a73d7f2e1d1
revlog: REVIDX_EXTSTORED flag

diff --git a/mercurial/help/internals/revlogs.txt b/mercurial/help/internals/revlogs.txt
--- a/mercurial/help/internals/revlogs.txt
+++ b/mercurial/help/internals/revlogs.txt
@@ -90,6 +90,7 @@
 6-7 (2 bytes)
    Bit flags impacting revision behavior. The following bit offsets define:
    0: REVIDX_ISCENSORED indicates the revision has censored metadata.
+   1: REVIDX_EXTSTORED indicates the revision data is stored externally.
 8-11 (4 bytes)
    Compressed length of revision data / chunk as stored in revlog.
 12-15 (4 bytes)
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -54,11 +54,13 @@
 
 # revlog index flags
 REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
+REVIDX_EXTSTORED = (1 << 14) # revision data is stored externally
 REVIDX_DEFAULT_FLAGS = 0
-REVIDX_KNOWN_FLAGS = REVIDX_ISCENSORED
+REVIDX_KNOWN_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
 # stable order in which flags need to be processed and their transforms applied
 REVIDX_FLAGS_ORDER = [
     REVIDX_ISCENSORED,
+    REVIDX_EXTSTORED,
 ]
 
 # max size of revlog with inline data