/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-
-const char *yaffs_guts_c_version =
- "$Id: yaffs_guts.c,v 1.120 2010-03-15 23:10:34 charles Exp $";
-
#include "yportenv.h"
#include "yaffs_trace.h"
/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
#define YAFFS_GC_GOOD_ENOUGH 2
#define YAFFS_GC_PASSIVE_THRESHOLD 4
+
#define YAFFS_SMALL_HOLE_THRESHOLD 3
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
#include "yaffs_ecc.h"
int force, int isShrink, int shadows);
static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
static int yaffs_CheckStructures(void);
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
- int chunkOffset, int *limit);
static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
static __u32 Shifts(__u32 x)
{
- int nShifts;
+ __u32 nShifts;
nShifts = 0;
}
-
+#if 0
+/* Not being used, but don't want to throw away yet */
static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
__u32 level, int chunkOffset)
{
}
+#endif
static void yaffs_VerifyFile(yaffs_Object *obj)
{
return -1;
}
-
+#if 0
+/* Experimental code not being used yet. Might speed up file deletion */
/* DeleteWorker scans backwards through the tnode tree and deletes all the
- * chunks and tnodes in the file
+ * chunks and tnodes in the file.
* Returns 1 if the tree was deleted.
* Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
*/
}
+#endif
+
static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
{
yaffs_BlockInfo *theBlock;
+static int yaffs_CheckpointRequired(yaffs_Device *dev)
+{
+ int nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ;
+ return dev->param.isYaffs2 &&
+ !dev->param.skipCheckpointWrite &&
+ (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
{
if (!dev->nCheckpointBlocksRequired &&
- dev->param.isYaffs2) {
+ yaffs_CheckpointRequired(dev)){
/* Not a valid value so recalculate */
int nBytes = 0;
int nBlocks;
selected = dev->gcDirtiest;
}
- if(!selected && dev->param.isYaffs2 && dev->gcNotDone >= ( background ? 10 : 20)){
+ /*
+ * If nothing has been selected for a while, try selecting the oldest dirty
+ * because that's gumming up the works.
+ */
+
+ if(!selected && dev->param.isYaffs2 &&
+ dev->gcNotDone >= ( background ? 10 : 20)){
yaffs_FindOldestDirtySequence(dev);
if(dev->oldestDirtyBlock > 0) {
selected = dev->oldestDirtyBlock;
dev->gcDirtiest = selected;
+ dev->oldestDirtyGCs++;
bi = yaffs_GetBlockInfo(dev, selected);
dev->gcPagesInUse = bi->pagesInUse - bi->softDeletions;
} else
dev->param.nChunksPerBlock - dev->gcPagesInUse,
prioritised));
+ if(background)
+ dev->backgroundGCs++;
dev->gcDirtiest = 0;
dev->gcPagesInUse = 0;
dev->gcNotDone = 0;
}
if (dev->gcBlock > 0) {
- dev->garbageCollections++;
+ dev->allGCs++;
if (!aggressive)
- dev->passiveGarbageCollections++;
+ dev->passiveGCs++;
T(YAFFS_TRACE_GC,
(TSTR
* Garbage collects. Intended to be called from a background thread.
* Returns non-zero if at least half the free chunks are erased.
*/
-int yaffs_BackgroundGarbageCollect(yaffs_Device *dev)
+int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency)
{
int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
- T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc" TENDSTR)));
+ T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
yaffs_CheckGarbageCollection(dev, 1);
return erasedChunks > dev->nFreeChunks/2;
{
int ok = 1;
- if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
+ if (!yaffs_CheckpointRequired(dev)) {
T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
ok = 0;
}
dev = in->myDev;
while (n > 0 && chunkWritten >= 0) {
- /* chunk = offset / dev->nDataBytesPerChunk + 1; */
- /* start = offset % dev->nDataBytesPerChunk; */
yaffs_AddrToChunk(dev, offset, &chunk, &start);
if (chunk * dev->nDataBytesPerChunk + start != offset ||
TENDSTR),
(int)offset, chunk, start));
}
- chunk++;
+ chunk++; /* File pos to chunk in file offset */
/* OK now check for the curveball where the start and end are in
* the same chunk.
int yaffs_DeleteFile(yaffs_Object *in)
{
int retVal = YAFFS_OK;
- int deleted = in->deleted;
+ int deleted; /* Need to cache value on stack if in is freed */
yaffs_Device *dev = in->myDev;
if (dev->param.disableSoftDelete || dev->param.isYaffs2)
if (!in->unlinked)
retVal = yaffs_UnlinkFileIfNeeded(in);
+ deleted = in->deleted;
+
if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
in->deleted = 1;
deleted = 1;
* the current allocation block.
*/
- T(YAFFS_TRACE_ALWAYS,
+ T(YAFFS_TRACE_SCAN,
(TSTR("Partially written block %d detected" TENDSTR),
blk));
}
/* OK, we've finished verifying the device, lets continue with initialisation */
/* More device initialisation */
- dev->garbageCollections = 0;
- dev->passiveGarbageCollections = 0;
+ dev->allGCs = 0;
+ dev->passiveGCs = 0;
+ dev->oldestDirtyGCs = 0;
+ dev->backgroundGCs = 0;
dev->gcBlockFinder = 0;
dev->bufferedBlock = -1;
dev->doingBufferedBlockRewrite = 0;
projects / yaffs2.git / blobdiff