[POWERPC] celleb: Update celleb_defconfig

[powerpc.git] / fs / gfs2 / ops_address.c

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 56e3359..30c1562 100644 (file)
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -197,7 +197,19 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
        void *kaddr;
        int error;
 
-       BUG_ON(page->index);
+       /*
+        * Due to the order of unstuffing files and ->nopage(), we can be
+        * asked for a zero page in the case of a stuffed file being extended,
+        * so we need to supply one here. It doesn't happen often.
+        */
+       if (unlikely(page->index)) {
+               kaddr = kmap_atomic(page, KM_USER0);
+               memset(kaddr, 0, PAGE_CACHE_SIZE);
+               kunmap_atomic(kaddr, KM_USER0);
+               flush_dcache_page(page);
+               SetPageUptodate(page);
+               return 0;
+       }
 
        error = gfs2_meta_inode_buffer(ip, &dibh);
        if (error)
@@ -208,9 +220,8 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
               ip->i_di.di_size);
        memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size);
        kunmap_atomic(kaddr, KM_USER0);
-
+       flush_dcache_page(page);
        brelse(dibh);
-
        SetPageUptodate(page);
 
        return 0;
@@ -266,9 +277,11 @@ skip_lock:
 out:
        return error;
 out_unlock:
-       if (error == GLR_TRYFAILED)
-               error = AOP_TRUNCATED_PAGE;
        unlock_page(page);
+       if (error == GLR_TRYFAILED) {
+               error = AOP_TRUNCATED_PAGE;
+               yield();
+       }
        if (do_unlock)
                gfs2_holder_uninit(&gh);
        goto out;
@@ -364,6 +377,7 @@ static int gfs2_prepare_write(struct file *file, struct page *page,
                if (error == GLR_TRYFAILED) {
                        unlock_page(page);
                        error = AOP_TRUNCATED_PAGE;
+                       yield();
                }
                goto out_uninit;
        }
@@ -504,7 +518,9 @@ static int gfs2_commit_write(struct file *file, struct page *page,
                gfs2_quota_unlock(ip);
                gfs2_alloc_put(ip);
        }
+       unlock_page(page);
        gfs2_glock_dq_m(1, &ip->i_gh);
+       lock_page(page);
        gfs2_holder_uninit(&ip->i_gh);
        return 0;
 
@@ -517,7 +533,9 @@ fail_endtrans:
                gfs2_quota_unlock(ip);
                gfs2_alloc_put(ip);
        }
+       unlock_page(page);
        gfs2_glock_dq_m(1, &ip->i_gh);
+       lock_page(page);
        gfs2_holder_uninit(&ip->i_gh);
 fail_nounlock:
        ClearPageUptodate(page);