From 7da4760cfac317e4ee8fcc564c04135f7e5ac08b Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 13 Nov 1999 15:37:07 +0000
Subject: [PATCH] Added pgc_page_pos().

Don't forget to unhash buffers when freeing them.
---
 lib/pagecache.c | 9 +++++++++
 lib/pagecache.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/lib/pagecache.c b/lib/pagecache.c
index 1ffb1886..16291620 100644
--- a/lib/pagecache.c
+++ b/lib/pagecache.c
@@ -162,6 +162,7 @@ get_page(struct page_cache *c, sh_off_t key)
 	{
 	  /* There are only dirty pages here */
 	  p = HEAD(c->dirty_pages);
+	  ASSERT(p->n.next);
 	  flush_page(c, p);
 	}
       ASSERT(!p->lock_count);
@@ -206,6 +207,7 @@ pgc_cleanup(struct page_cache *c)
     {
       ASSERT(!(p->flags & PG_FLAG_DIRTY) && !p->lock_count);
       rem_node(&p->n);
+      rem_node(&p->hn);
       c->free_count--;
       c->total_count--;
       free(p);
@@ -289,6 +291,7 @@ pgc_put(struct page_cache *c, struct page *p)
     }
   else
     {
+      rem_node(&p->hn);
       free(p);
       c->total_count--;
     }
@@ -319,6 +322,12 @@ pgc_read_data(struct page_cache *c, int fd, sh_off_t pos, uns *len)
   return p->data + offset;
 }
 
+sh_off_t
+pgc_page_pos(struct page_cache *c, struct page *p)
+{
+  return PAGE_NUMBER(p->key);
+}
+
 #ifdef TEST
 
 int main(int argc, char **argv)
diff --git a/lib/pagecache.h b/lib/pagecache.h
index 5c2661a0..7598f345 100644
--- a/lib/pagecache.h
+++ b/lib/pagecache.h
@@ -33,5 +33,6 @@ struct page *pgc_get(struct page_cache *, int fd, sh_off_t);	/* Get page for wri
 void pgc_put(struct page_cache *, struct page *);		/* Release page */
 void pgc_mark_dirty(struct page_cache *, struct page *);	/* Mark locked page as dirty */
 byte *pgc_read_data(struct page_cache *, int fd, sh_off_t, uns *);	/* Partial reading */
+sh_off_t pgc_page_pos(struct page_cache *, struct page *);	/* Get page position */
 
 #endif
-- 
2.39.2