diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java
index c6e2fae42..16e7a0d53 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java
@@ -412,8 +412,7 @@ DfsBlock getOrLoad(BlockBasedFile file, long position, DfsReader ctx,
 			getStat(statMiss, key).incrementAndGet();
 			boolean credit = true;
 			try {
-				v = file.readOneBlock(requestedPosition, ctx,
-						fileChannel.get());
+				v = file.readOneBlock(position, ctx, fileChannel.get());
 				credit = false;
 			} finally {
 				if (credit) {
@@ -450,7 +449,7 @@ DfsBlock getOrLoad(BlockBasedFile file, long position, DfsReader ctx,
 	}
 
 	@SuppressWarnings("unchecked")
-	private void reserveSpace(int reserve, DfsStreamKey key) {
+	private void reserveSpace(long reserve, DfsStreamKey key) {
 		clockLock.lock();
 		try {
 			long live = LongStream.of(getCurrentSize()).sum() + reserve;
@@ -487,7 +486,7 @@ private void reserveSpace(int reserve, DfsStreamKey key) {
 		}
 	}
 
-	private void creditSpace(int credit, DfsStreamKey key) {
+	private void creditSpace(long credit, DfsStreamKey key) {
 		clockLock.lock();
 		try {
 			getStat(liveBytes, key).addAndGet(-credit);
@@ -497,7 +496,7 @@ private void creditSpace(int credit, DfsStreamKey key) {
 	}
 
 	@SuppressWarnings("unchecked")
-	private void addToClock(Ref ref, int credit) {
+	private void addToClock(Ref ref, long credit) {
 		clockLock.lock();
 		try {
 			if (credit != 0) {
@@ -521,17 +520,20 @@ void put(DfsBlock v) {
 	 *
 	 * @param key
 	 *            the stream key of the pack.
+	 * @param position
+	 *            the position in the key. The default should be 0.
 	 * @param loader
 	 *            the function to load the reference.
 	 * @return the object reference.
 	 * @throws IOException
 	 *             the reference was not in the cache and could not be loaded.
 	 */
-	<T> Ref<T> getOrLoadRef(DfsStreamKey key, RefLoader<T> loader)
+	<T> Ref<T> getOrLoadRef(
+			DfsStreamKey key, long position, RefLoader<T> loader)
 			throws IOException {
-		int slot = slot(key, 0);
+		int slot = slot(key, position);
 		HashEntry e1 = table.get(slot);
-		Ref<T> ref = scanRef(e1, key, 0);
+		Ref<T> ref = scanRef(e1, key, position);
 		if (ref != null) {
 			getStat(statHit, key).incrementAndGet();
 			return ref;
@@ -543,7 +545,7 @@ <T> Ref<T> getOrLoadRef(DfsStreamKey key, RefLoader<T> loader)
 		try {
 			HashEntry e2 = table.get(slot);
 			if (e2 != e1) {
-				ref = scanRef(e2, key, 0);
+				ref = scanRef(e2, key, position);
 				if (ref != null) {
 					getStat(statHit, key).incrementAndGet();
 					return ref;
@@ -574,10 +576,10 @@ <T> Ref<T> getOrLoadRef(DfsStreamKey key, RefLoader<T> loader)
 	}
 
 	<T> Ref<T> putRef(DfsStreamKey key, long size, T v) {
-		return put(key, 0, (int) Math.min(size, Integer.MAX_VALUE), v);
+		return put(key, 0, size, v);
 	}
 
-	<T> Ref<T> put(DfsStreamKey key, long pos, int size, T v) {
+	<T> Ref<T> put(DfsStreamKey key, long pos, long size, T v) {
 		int slot = slot(key, pos);
 		HashEntry e1 = table.get(slot);
 		Ref<T> ref = scanRef(e1, key, pos);
@@ -720,12 +722,12 @@ private static final class HashEntry {
 	static final class Ref<T> {
 		final DfsStreamKey key;
 		final long position;
-		final int size;
+		final long size;
 		volatile T value;
 		Ref next;
 		volatile boolean hot;
 
-		Ref(DfsStreamKey key, long position, int size, T v) {
+		Ref(DfsStreamKey key, long position, long size, T v) {
 			this.key = key;
 			this.position = position;
 			this.size = size;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
index be1387ed0..6c69019e0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
@@ -89,6 +89,7 @@
  */
 public final class DfsPackFile extends BlockBasedFile {
 	private static final int REC_SIZE = Constants.OBJECT_ID_LENGTH + 8;
+	private static final long REF_POSITION = 0;
 
 	/**
 	 * Lock for initialization of {@link #index} and {@link #corruptObjects}.
@@ -194,45 +195,10 @@ private PackIndex idx(DfsReader ctx) throws IOException {
 
 			try {
 				DfsStreamKey idxKey = desc.getStreamKey(INDEX);
-				DfsBlockCache.Ref<PackIndex> idxref = cache.getOrLoadRef(idxKey,
-						() -> {
-							try {
-								ctx.stats.readIdx++;
-								long start = System.nanoTime();
-								try (ReadableChannel rc = ctx.db.openFile(desc,
-										INDEX)) {
-									InputStream in = Channels
-											.newInputStream(rc);
-									int wantSize = 8192;
-									int bs = rc.blockSize();
-									if (0 < bs && bs < wantSize) {
-										bs = (wantSize / bs) * bs;
-									} else if (bs <= 0) {
-										bs = wantSize;
-									}
-									PackIndex idx = PackIndex.read(
-											new BufferedInputStream(in, bs));
-									int sz = (int) Math.min(
-											idx.getObjectCount() * REC_SIZE,
-											Integer.MAX_VALUE);
-									ctx.stats.readIdxBytes += rc.position();
-									index = idx;
-									return new DfsBlockCache.Ref<>(idxKey, 0,
-											sz, idx);
-								} finally {
-									ctx.stats.readIdxMicros += elapsedMicros(
-											start);
-								}
-							} catch (EOFException e) {
-								throw new IOException(MessageFormat.format(
-										DfsText.get().shortReadOfIndex,
-										desc.getFileName(INDEX)), e);
-							} catch (IOException e) {
-								throw new IOException(MessageFormat.format(
-										DfsText.get().cannotReadIndex,
-										desc.getFileName(INDEX)), e);
-							}
-						});
+				DfsBlockCache.Ref<PackIndex> idxref = cache.getOrLoadRef(
+						idxKey,
+						REF_POSITION,
+						() -> loadPackIndex(ctx, idxKey));
 				PackIndex idx = idxref.get();
 				if (index == null && idx != null) {
 					index = idx;
@@ -267,44 +233,10 @@ PackBitmapIndex getBitmapIndex(DfsReader ctx) throws IOException {
 			PackIndex idx = idx(ctx);
 			PackReverseIndex revidx = getReverseIdx(ctx);
 			DfsStreamKey bitmapKey = desc.getStreamKey(BITMAP_INDEX);
-			DfsBlockCache.Ref<PackBitmapIndex> idxref = cache
-					.getOrLoadRef(bitmapKey, () -> {
-						ctx.stats.readBitmap++;
-						long start = System.nanoTime();
-						try (ReadableChannel rc = ctx.db.openFile(desc,
-								BITMAP_INDEX)) {
-							long size;
-							PackBitmapIndex bmidx;
-							try {
-								InputStream in = Channels.newInputStream(rc);
-								int wantSize = 8192;
-								int bs = rc.blockSize();
-								if (0 < bs && bs < wantSize) {
-									bs = (wantSize / bs) * bs;
-								} else if (bs <= 0) {
-									bs = wantSize;
-								}
-								in = new BufferedInputStream(in, bs);
-								bmidx = PackBitmapIndex.read(in, idx, revidx);
-							} finally {
-								size = rc.position();
-								ctx.stats.readIdxBytes += size;
-								ctx.stats.readIdxMicros += elapsedMicros(start);
-							}
-							int sz = (int) Math.min(size, Integer.MAX_VALUE);
-							bitmapIndex = bmidx;
-							return new DfsBlockCache.Ref<>(bitmapKey, 0, sz,
-									bmidx);
-						} catch (EOFException e) {
-							throw new IOException(MessageFormat.format(
-									DfsText.get().shortReadOfIndex,
-									desc.getFileName(BITMAP_INDEX)), e);
-						} catch (IOException e) {
-							throw new IOException(MessageFormat.format(
-									DfsText.get().cannotReadIndex,
-									desc.getFileName(BITMAP_INDEX)), e);
-						}
-					});
+			DfsBlockCache.Ref<PackBitmapIndex> idxref = cache.getOrLoadRef(
+					bitmapKey,
+					REF_POSITION,
+					() -> loadBitmapIndex(ctx, bitmapKey, idx, revidx));
 			PackBitmapIndex bmidx = idxref.get();
 			if (bitmapIndex == null && bmidx != null) {
 				bitmapIndex = bmidx;
@@ -326,14 +258,10 @@ PackReverseIndex getReverseIdx(DfsReader ctx) throws IOException {
 			PackIndex idx = idx(ctx);
 			DfsStreamKey revKey = new DfsStreamKey.ForReverseIndex(
 					desc.getStreamKey(INDEX));
-			DfsBlockCache.Ref<PackReverseIndex> revref = cache
-					.getOrLoadRef(revKey, () -> {
-						PackReverseIndex revidx = new PackReverseIndex(idx);
-						int sz = (int) Math.min(idx.getObjectCount() * 8,
-								Integer.MAX_VALUE);
-						reverseIndex = revidx;
-						return new DfsBlockCache.Ref<>(revKey, 0, sz, revidx);
-					});
+			DfsBlockCache.Ref<PackReverseIndex> revref = cache.getOrLoadRef(
+					revKey,
+					REF_POSITION,
+					() -> loadReverseIdx(ctx, revKey, idx));
 			PackReverseIndex revidx = revref.get();
 			if (reverseIndex == null && revidx != null) {
 				reverseIndex = revidx;
@@ -1091,4 +1019,91 @@ private void setCorrupt(long offset) {
 			list.add(offset);
 		}
 	}
+
+	private DfsBlockCache.Ref<PackIndex> loadPackIndex(
+			DfsReader ctx, DfsStreamKey idxKey) throws IOException {
+		try {
+			ctx.stats.readIdx++;
+			long start = System.nanoTime();
+			try (ReadableChannel rc = ctx.db.openFile(desc, INDEX)) {
+				InputStream in = Channels.newInputStream(rc);
+				int wantSize = 8192;
+				int bs = rc.blockSize();
+				if (0 < bs && bs < wantSize) {
+					bs = (wantSize / bs) * bs;
+				} else if (bs <= 0) {
+					bs = wantSize;
+				}
+				PackIndex idx = PackIndex.read(new BufferedInputStream(in, bs));
+				ctx.stats.readIdxBytes += rc.position();
+				index = idx;
+				return new DfsBlockCache.Ref<>(
+						idxKey,
+						REF_POSITION,
+						idx.getObjectCount() * REC_SIZE,
+						idx);
+			} finally {
+				ctx.stats.readIdxMicros += elapsedMicros(start);
+			}
+		} catch (EOFException e) {
+			throw new IOException(MessageFormat.format(
+					DfsText.get().shortReadOfIndex,
+					desc.getFileName(INDEX)), e);
+		} catch (IOException e) {
+			throw new IOException(MessageFormat.format(
+					DfsText.get().cannotReadIndex,
+					desc.getFileName(INDEX)), e);
+		}
+	}
+
+	private DfsBlockCache.Ref<PackReverseIndex> loadReverseIdx(
+			DfsReader ctx, DfsStreamKey revKey, PackIndex idx) {
+		PackReverseIndex revidx = new PackReverseIndex(idx);
+		reverseIndex = revidx;
+		return new DfsBlockCache.Ref<>(
+				revKey,
+				REF_POSITION,
+				idx.getObjectCount() * 8,
+				revidx);
+	}
+
+	private DfsBlockCache.Ref<PackBitmapIndex> loadBitmapIndex(
+			DfsReader ctx,
+			DfsStreamKey bitmapKey,
+			PackIndex idx,
+			PackReverseIndex revidx) throws IOException {
+		ctx.stats.readBitmap++;
+		long start = System.nanoTime();
+		try (ReadableChannel rc = ctx.db.openFile(desc, BITMAP_INDEX)) {
+			long size;
+			PackBitmapIndex bmidx;
+			try {
+				InputStream in = Channels.newInputStream(rc);
+				int wantSize = 8192;
+				int bs = rc.blockSize();
+				if (0 < bs && bs < wantSize) {
+					bs = (wantSize / bs) * bs;
+				} else if (bs <= 0) {
+					bs = wantSize;
+				}
+				in = new BufferedInputStream(in, bs);
+				bmidx = PackBitmapIndex.read(in, idx, revidx);
+			} finally {
+				size = rc.position();
+				ctx.stats.readIdxBytes += size;
+				ctx.stats.readIdxMicros += elapsedMicros(start);
+			}
+			bitmapIndex = bmidx;
+			return new DfsBlockCache.Ref<>(
+					bitmapKey, REF_POSITION, size, bmidx);
+		} catch (EOFException e) {
+			throw new IOException(MessageFormat.format(
+					DfsText.get().shortReadOfIndex,
+					desc.getFileName(BITMAP_INDEX)), e);
+		} catch (IOException e) {
+			throw new IOException(MessageFormat.format(
+					DfsText.get().cannotReadIndex,
+					desc.getFileName(BITMAP_INDEX)), e);
+		}
+	}
 }