Add debug proc entry for gathering gc stats

[yaffs2.git] / yaffs_fs.c

diff --git a/yaffs_fs.c b/yaffs_fs.c
index 63d31645cfa89e55cb1c3a3fcd622d251356b461..c686fd5d5cffc08a108d7a37d97043144abdaccd 100644 (file)
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -32,7 +32,7 @@
  */
 
 const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.98 2010-03-10 01:22:19 charles Exp $";
+    "$Id: yaffs_fs.c,v 1.100 2010-03-15 06:28:36 charles Exp $";
 extern const char *yaffs_guts_c_version;
 
 #include <linux/version.h>
@@ -2009,6 +2009,7 @@ static void yaffs_read_inode(struct inode *inode)
 #endif
 
 static YLIST_HEAD(yaffs_context_list);
+struct semaphore yaffs_context_lock;
 
 #if 0 /* not used */
 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
@@ -2057,8 +2058,9 @@ static void yaffs_put_super(struct super_block *sb)
 
        yaffs_GrossUnlock(dev);
 
-       /* we assume this is protected by lock_kernel() in mount/umount */
+       down(&yaffs_context_lock);
        ylist_del_init(&(yaffs_DeviceToContext(dev)->contextList));
+       up(&yaffs_context_lock);
 
        if (yaffs_DeviceToContext(dev)->spareBuffer) {
                YFREE(yaffs_DeviceToContext(dev)->spareBuffer);
@@ -2476,7 +2478,9 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
        param->skipCheckpointWrite = options.skip_checkpoint_write;
 
        /* we assume this is protected by lock_kernel() in mount/umount */
+       down(&yaffs_context_lock);
        ylist_add_tail(&(yaffs_DeviceToContext(dev)->contextList), &yaffs_context_list);
+       up(&yaffs_context_lock);
 
         /* Directory search handling...*/
         YINIT_LIST_HEAD(&(yaffs_DeviceToContext(dev)->searchContexts));
@@ -2628,6 +2632,7 @@ static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
 #endif                         /* CONFIG_YAFFS_YAFFS2 */
 
 static struct proc_dir_entry *my_proc_entry;
+static struct proc_dir_entry *debug_proc_entry;
 
 static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
 {
@@ -2641,6 +2646,8 @@ static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
        buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
        buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
        buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
+       buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
+       buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
 
        buf += sprintf(buf, "\n");
 
@@ -2654,32 +2661,32 @@ static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
        buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
        buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
        buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
-       buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
        buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
+       buf += sprintf(buf, "\n");
        buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
        buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
        buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
        buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
        buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
-       buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
-       buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
-       buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
-       buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
-       buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
-       buf += sprintf(buf, "passiveGCs......... %d\n", dev->passiveGarbageCollections);
-       buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
-       buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
-       buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
-       buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
-       buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
-       buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
-       buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
-       buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
-       buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
-       buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
-       buf += sprintf(buf, "refreshCount....... %d\n", dev->refreshCount);
+       buf += sprintf(buf, "\n");
+       buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
+       buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
+       buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
+       buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
+       buf += sprintf(buf, "garbageCollections. %u\n", dev->garbageCollections);
+       buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGarbageCollections);
+       buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
+       buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
+       buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
+       buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
+       buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
+       buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
+       buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
+       buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
+       buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
+       buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
        buf +=
-           sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
+           sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
 
        return buf;
 }
@@ -2711,8 +2718,7 @@ static int yaffs_proc_read(char *page,
        else {
                step-=2;
                
-               /* hold lock_kernel while traversing yaffs_dev_list */
-               lock_kernel();
+               down(&yaffs_context_lock);
 
                /* Locate and print the Nth entry.  Order N-squared but N is small. */
                ylist_for_each(item, &yaffs_context_list) {
@@ -2731,8 +2737,32 @@ static int yaffs_proc_read(char *page,
                        
                        break;
                }
-               unlock_kernel();
+               up(&yaffs_context_lock);
+       }
+
+       return buf - page < count ? buf - page : count;
+}
+
+static int yaffs_debug_proc_read(char *page,
+                               char **start,
+                               off_t offset, int count, int *eof, void *data)
+{
+       struct ylist_head *item;
+       char *buf = page;
+       int step = offset;
+       int n = 0;
+
+       down(&yaffs_context_lock);
+
+       /* Locate and print the Nth entry.  Order N-squared but N is small. */
+       ylist_for_each(item, &yaffs_context_list) {
+               struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+               yaffs_Device *dev = dc->dev;
+               
+               buf += sprintf(buf,"%d %u %u\n", n, dev->nFreeChunks, dev->nErasedBlocks * dev->param.nChunksPerBlock);
        }
+       up(&yaffs_context_lock);
+
 
        return buf - page < count ? buf - page : count;
 }
@@ -2899,7 +2929,9 @@ static int __init init_yaffs_fs(void)
        T(YAFFS_TRACE_ALWAYS,
          ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
 
-       /* Install the proc_fs entry */
+       init_MUTEX(&yaffs_context_lock);
+
+       /* Install the proc_fs entries */
        my_proc_entry = create_proc_entry("yaffs",
                                               S_IRUGO | S_IFREG,
                                               YPROC_ROOT);
@@ -2911,6 +2943,17 @@ static int __init init_yaffs_fs(void)
        } else
                return -ENOMEM;
 
+       debug_proc_entry = create_proc_entry("yaffs_debug",
+                                              S_IRUGO | S_IFREG,
+                                              YPROC_ROOT);
+
+       if (debug_proc_entry) {
+               debug_proc_entry->write_proc = NULL;
+               debug_proc_entry->read_proc = yaffs_debug_proc_read;
+               debug_proc_entry->data = NULL;
+       } else
+               return -ENOMEM;
+
        /* Now add the file system entries */
 
        fsinst = fs_to_install;