Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6

[sfrench/cifs-2.6.git] / fs / xfs / linux-2.6 / xfs_buf.c

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 39f44ee572e86ec5f417bbb20d1ed1b4af8ce36d..b9c8589e05c2e937de37db78f1ea1f532c773f01 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -187,6 +187,19 @@ free_address(
 {
        a_list_t        *aentry;
 
+#ifdef CONFIG_XEN
+       /*
+        * Xen needs to be able to make sure it can get an exclusive
+        * RO mapping of pages it wants to turn into a pagetable.  If
+        * a newly allocated page is also still being vmap()ed by xfs,
+        * it will cause pagetable construction to fail.  This is a
+        * quick workaround to always eagerly unmap pages so that Xen
+        * is happy.
+        */
+       vunmap(addr);
+       return;
+#endif
+
        aentry = kmalloc(sizeof(a_list_t), GFP_NOWAIT);
        if (likely(aentry)) {
                spin_lock(&as_lock);
@@ -997,7 +1010,18 @@ xfs_buf_iodone_work(
        xfs_buf_t               *bp =
                container_of(work, xfs_buf_t, b_iodone_work);
 
-       if (bp->b_iodone)
+       /*
+        * We can get an EOPNOTSUPP to ordered writes.  Here we clear the
+        * ordered flag and reissue them.  Because we can't tell the higher
+        * layers directly that they should not issue ordered I/O anymore, they
+        * need to check if the ordered flag was cleared during I/O completion.
+        */
+       if ((bp->b_error == EOPNOTSUPP) &&
+           (bp->b_flags & (XBF_ORDERED|XBF_ASYNC)) == (XBF_ORDERED|XBF_ASYNC)) {
+               XB_TRACE(bp, "ordered_retry", bp->b_iodone);
+               bp->b_flags &= ~XBF_ORDERED;
+               xfs_buf_iorequest(bp);
+       } else if (bp->b_iodone)
                (*(bp->b_iodone))(bp);
        else if (bp->b_flags & XBF_ASYNC)
                xfs_buf_relse(bp);