ceph: don't truncate dirty pages in invalidate work thread

[safe/jmp/linux-2.6] / fs / ceph / inode.c

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index d7d5d49..7abe1ae 100644 (file)
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -10,6 +10,7 @@
 #include <linux/namei.h>
 #include <linux/writeback.h>
 #include <linux/vmalloc.h>
+#include <linux/pagevec.h>
 
 #include "super.h"
 #include "decode.h"
@@ -1280,6 +1281,49 @@ void ceph_queue_invalidate(struct inode *inode)
 }
 
 /*
+ * invalidate any pages that are not dirty or under writeback.  this
+ * includes pages that are clean and mapped.
+ */
+static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
+{
+       struct pagevec pvec;
+       pgoff_t next = 0;
+       int i;
+
+       pagevec_init(&pvec, 0);
+       while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+               for (i = 0; i < pagevec_count(&pvec); i++) {
+                       struct page *page = pvec.pages[i];
+                       pgoff_t index;
+                       int skip_page =
+                               (PageDirty(page) || PageWriteback(page));
+
+                       if (!skip_page)
+                               skip_page = !trylock_page(page);
+
+                       /*
+                        * We really shouldn't be looking at the ->index of an
+                        * unlocked page.  But we're not allowed to lock these
+                        * pages.  So we rely upon nobody altering the ->index
+                        * of this (pinned-by-us) page.
+                        */
+                       index = page->index;
+                       if (index > next)
+                               next = index;
+                       next++;
+
+                       if (skip_page)
+                               continue;
+
+                       generic_error_remove_page(mapping, page);
+                       unlock_page(page);
+               }
+               pagevec_release(&pvec);
+               cond_resched();
+       }
+}
+
+/*
  * Invalidate inode pages in a worker thread.  (This can't be done
  * in the message handler context.)
  */
@@ -1305,7 +1349,7 @@ static void ceph_invalidate_work(struct work_struct *work)
        orig_gen = ci->i_rdcache_gen;
        spin_unlock(&inode->i_lock);
 
-       truncate_inode_pages(&inode->i_data, 0);
+       ceph_invalidate_nondirty_pages(inode->i_mapping);
 
        spin_lock(&inode->i_lock);
        if (orig_gen == ci->i_rdcache_gen) {