[GFS2] Addendum patch 2 for gfs2_grow

[linux-2.6-omap-h63xx.git] / fs / gfs2 / ops_address.c

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index b3b7e8475359d0feae533b9f80f2229e1ae6993e..4913ef57b0955a9dfb73dcb1571dc9e98f53901d 100644 (file)
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -32,6 +32,7 @@
 #include "trans.h"
 #include "rgrp.h"
 #include "ops_file.h"
+#include "super.h"
 #include "util.h"
 #include "glops.h"
 
@@ -197,7 +198,19 @@ 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 +221,8 @@ 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;
@@ -438,6 +450,31 @@ out_uninit:
        return error;
 }
 
+/**
+ * adjust_fs_space - Adjusts the free space available due to gfs2_grow
+ * @inode: the rindex inode
+ */
+static void adjust_fs_space(struct inode *inode)
+{
+       struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
+       struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
+       struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
+       u64 fs_total, new_free;
+
+       /* Total up the file system space, according to the latest rindex. */
+       fs_total = gfs2_ri_total(sdp);
+
+       spin_lock(&sdp->sd_statfs_spin);
+       if (fs_total > (m_sc->sc_total + l_sc->sc_total))
+               new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
+       else
+               new_free = 0;
+       spin_unlock(&sdp->sd_statfs_spin);
+       fs_warn(sdp, "File system extended by %llu blocks.\n",
+               (unsigned long long)new_free);
+       gfs2_statfs_change(sdp, new_free, new_free, 0);
+}
+
 /**
  * gfs2_commit_write - Commit write to a file
  * @file: The file to write to
@@ -500,6 +537,9 @@ static int gfs2_commit_write(struct file *file, struct page *page,
                di->di_size = cpu_to_be64(inode->i_size);
        }
 
+       if (inode == sdp->sd_rindex)
+               adjust_fs_space(inode);
+
        brelse(dibh);
        gfs2_trans_end(sdp);
        if (al->al_requested) {
@@ -507,7 +547,9 @@ 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;
 
@@ -520,7 +562,9 @@ 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);