Add debug proc entry for gathering gc stats

diff --git a/yaffs_fs.c b/yaffs_fs.c
index 3deef5d7e47065d44e0a855a06ac66f101de7deb..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 1.99 2010-03-15 06:07:44 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>
@@ -2632,6 +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)
 {
@@ -2742,6 +2743,30 @@ static int yaffs_proc_read(char *page,
        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;
+}
+
 /**
  * Set the verbosity of the warnings and error messages.
  *
@@ -2906,7 +2931,7 @@ static int __init init_yaffs_fs(void)
 
        init_MUTEX(&yaffs_context_lock);
 
-       /* Install the proc_fs entry */
+       /* Install the proc_fs entries */
        my_proc_entry = create_proc_entry("yaffs",
                                               S_IRUGO | S_IFREG,
                                               YPROC_ROOT);
@@ -2918,6 +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;