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SubjectRe: [patch] truncate_inode_pages
Daniel Phillips wrote:
>
> This is easy, just set the list head to the page about to be truncated.

Works for me.

--- linux-2.4.5/mm/filemap.c Mon May 28 13:31:49 2001
+++ linux-akpm/mm/filemap.c Sun Jun 10 11:29:19 2001
@@ -235,12 +235,13 @@

/* Is one of the pages to truncate? */
if ((offset >= start) || (*partial && (offset + 1) == start)) {
+ list_del(head);
+ list_add_tail(head, curr);
if (TryLockPage(page)) {
page_cache_get(page);
spin_unlock(&pagecache_lock);
wait_on_page(page);
- page_cache_release(page);
- return 1;
+ goto out_restart;
}
page_cache_get(page);
spin_unlock(&pagecache_lock);
@@ -252,11 +253,14 @@
truncate_complete_page(page);

UnlockPage(page);
- page_cache_release(page);
- return 1;
+ goto out_restart;
}
}
return 0;
+out_restart:
+ page_cache_release(page);
+ spin_lock(&pagecache_lock);
+ return 1;
}


@@ -273,15 +277,18 @@
{
unsigned long start = (lstart + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
+ int complete;

-repeat:
spin_lock(&pagecache_lock);
- if (truncate_list_pages(&mapping->clean_pages, start, &partial))
- goto repeat;
- if (truncate_list_pages(&mapping->dirty_pages, start, &partial))
- goto repeat;
- if (truncate_list_pages(&mapping->locked_pages, start, &partial))
- goto repeat;
+ do {
+ complete = 1;
+ while (truncate_list_pages(&mapping->clean_pages, start, &partial))
+ complete = 0;
+ while (truncate_list_pages(&mapping->dirty_pages, start, &partial))
+ complete = 0;
+ while (truncate_list_pages(&mapping->locked_pages, start, &partial))
+ complete = 0;
+ } while (!complete);
spin_unlock(&pagecache_lock);
}
-
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