Pull suspend-2.6.24 into release branch

[pandora-kernel.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 404e53b..51b3d6c 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -915,6 +915,21 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
        struct inode *inode;
 
        BUG_ON(!PageLocked(page));
+       /*
+        * shmem_backing_dev_info's capabilities prevent regular writeback or
+        * sync from ever calling shmem_writepage; but a stacking filesystem
+        * may use the ->writepage of its underlying filesystem, in which case
+        * we want to do nothing when that underlying filesystem is tmpfs
+        * (writing out to swap is useful as a response to memory pressure, but
+        * of no use to stabilize the data) - just redirty the page, unlock it
+        * and claim success in this case.  AOP_WRITEPAGE_ACTIVATE, and the
+        * page_mapped check below, must be avoided unless we're in reclaim.
+        */
+       if (!wbc->for_reclaim) {
+               set_page_dirty(page);
+               unlock_page(page);
+               return 0;
+       }
        BUG_ON(page_mapped(page));
 
        mapping = page->mapping;
@@ -1057,7 +1072,7 @@ shmem_alloc_page(gfp_t gfp, struct shmem_inode_info *info,
        pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
        pvma.vm_pgoff = idx;
        pvma.vm_end = PAGE_SIZE;
-       page = alloc_page_vma(gfp | __GFP_ZERO, &pvma, 0);
+       page = alloc_page_vma(gfp, &pvma, 0);
        mpol_free(pvma.vm_policy);
        return page;
 }
@@ -1078,7 +1093,7 @@ shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx)
 static inline struct page *
 shmem_alloc_page(gfp_t gfp,struct shmem_inode_info *info, unsigned long idx)
 {
-       return alloc_page(gfp | __GFP_ZERO);
+       return alloc_page(gfp);
 }
 #endif
 
@@ -1291,6 +1306,7 @@ repeat:
 
                info->alloced++;
                spin_unlock(&info->lock);
+               clear_highpage(filepage);
                flush_dcache_page(filepage);
                SetPageUptodate(filepage);
        }