From aebbbd6976ee4942923acffa63379beb8dbd15c6 Mon Sep 17 00:00:00 2001
From: Ed McClanahan <ed@swiftstack.com>
Date: Thu, 26 Dec 2019 14:03:16 -0800
Subject: [PATCH] Fix PFSAgent ExtentMap overlapping chunked PUTs and truncates

---
 pfsagentd/io.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pfsagentd/io.go b/pfsagentd/io.go
index 230000437..b5fef3d1b 100644
--- a/pfsagentd/io.go
+++ b/pfsagentd/io.go
@@ -1282,7 +1282,7 @@ func (chunkedPutContext *chunkedPutContextStruct) getReadPlanHelper(fileOffset u
 						fileOffset:        curFileOffset,
 						objectOffset:      inReadPlanStepAsSingleObjectExtent.objectOffset + (curFileOffset - inReadPlanStepAsSingleObjectExtent.fileOffset),
 						length:            overlapExtentWithLink.fileOffset - curFileOffset,
-						chunkedPutContext: chunkedPutContext,
+						chunkedPutContext: inReadPlanStepAsSingleObjectExtent.chunkedPutContext,
 					}
 
 					outReadPlan = append(outReadPlan, outReadPlanStepAsSingleObjectExtent)
@@ -1318,7 +1318,7 @@ func (chunkedPutContext *chunkedPutContextStruct) getReadPlanHelper(fileOffset u
 					fileOffset:        curFileOffset,
 					objectOffset:      inReadPlanStepAsSingleObjectExtent.objectOffset + (curFileOffset - inReadPlanStepAsSingleObjectExtent.fileOffset),
 					length:            remainingLength,
-					chunkedPutContext: chunkedPutContext,
+					chunkedPutContext: inReadPlanStepAsSingleObjectExtent.chunkedPutContext,
 				}
 
 				outReadPlan = append(outReadPlan, outReadPlanStepAsSingleObjectExtent)
@@ -1864,6 +1864,12 @@ func pruneExtentMap(extentMap sortedmap.LLRBTree, newSize uint64) {
 		ok                                 bool
 	)
 
+	// Nothing to do if extentMap hasn't been populated yet
+
+	if nil == extentMap {
+		return
+	}
+
 	// First, destroy any extents starting at or beyond newSize
 
 	index, _, err = extentMap.BisectRight(newSize)