Debug whether we end up classifying the wrong pages as
filesystem backed. This has not triggered in stress
tests on my system, but who knows...
Signed-off-by: Rik van Riel <[email protected]>
Index: linux-2.6.24-rc3-mm2/include/linux/mm_inline.h
===================================================================
--- linux-2.6.24-rc3-mm2.orig/include/linux/mm_inline.h
+++ linux-2.6.24-rc3-mm2/include/linux/mm_inline.h
@@ -1,6 +1,8 @@
#ifndef LINUX_MM_INLINE_H
#define LINUX_MM_INLINE_H
+#include <linux/fs.h> /* for struct address_space */
+
/**
* page_file_cache(@page)
* Returns !0 if @page is page cache page backed by a regular filesystem,
@@ -10,11 +12,19 @@
* needs to survive until the page is last deleted from the LRU, which
* could be as far down as __page_cache_release.
*/
+extern const struct address_space_operations shmem_aops;
static inline int page_file_cache(struct page *page)
{
+ struct address_space * mapping = page_mapping(page);
+
if (PageSwapBacked(page))
return 0;
+ /* These pages should all be marked PG_swapbacked */
+ WARN_ON(PageAnon(page));
+ WARN_ON(PageSwapCache(page));
+ WARN_ON(mapping && mapping->a_ops && mapping->a_ops == &shmem_aops);
+
/* The page is page cache backed by a normal filesystem. */
return 2;
}
Index: linux-2.6.24-rc3-mm2/mm/shmem.c
===================================================================
--- linux-2.6.24-rc3-mm2.orig/mm/shmem.c
+++ linux-2.6.24-rc3-mm2/mm/shmem.c
@@ -178,7 +178,7 @@ static inline void shmem_unacct_blocks(u
}
static const struct super_operations shmem_ops;
-static const struct address_space_operations shmem_aops;
+const struct address_space_operations shmem_aops;
static const struct file_operations shmem_file_operations;
static const struct inode_operations shmem_inode_operations;
static const struct inode_operations shmem_dir_inode_operations;
@@ -2232,7 +2232,7 @@ static void destroy_inodecache(void)
kmem_cache_destroy(shmem_inode_cachep);
}
-static const struct address_space_operations shmem_aops = {
+const struct address_space_operations shmem_aops = {
.writepage = shmem_writepage,
.set_page_dirty = __set_page_dirty_no_writeback,
#ifdef CONFIG_TMPFS
--
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