[XFS] remove old vmap cache

[safe/jmp/linux-2.6] / 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 cb329ed..0b2177a 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -166,75 +166,6 @@ test_page_region(
 }
 
 /*
- *     Mapping of multi-page buffers into contiguous virtual space
- */
-
-typedef struct a_list {
-       void            *vm_addr;
-       struct a_list   *next;
-} a_list_t;
-
-static a_list_t                *as_free_head;
-static int             as_list_len;
-static DEFINE_SPINLOCK(as_lock);
-
-/*
- *     Try to batch vunmaps because they are costly.
- */
-STATIC void
-free_address(
-       void            *addr)
-{
-       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);
-               aentry->next = as_free_head;
-               aentry->vm_addr = addr;
-               as_free_head = aentry;
-               as_list_len++;
-               spin_unlock(&as_lock);
-       } else {
-               vunmap(addr);
-       }
-}
-
-STATIC void
-purge_addresses(void)
-{
-       a_list_t        *aentry, *old;
-
-       if (as_free_head == NULL)
-               return;
-
-       spin_lock(&as_lock);
-       aentry = as_free_head;
-       as_free_head = NULL;
-       as_list_len = 0;
-       spin_unlock(&as_lock);
-
-       while ((old = aentry) != NULL) {
-               vunmap(aentry->vm_addr);
-               aentry = aentry->next;
-               kfree(old);
-       }
-}
-
-/*
  *     Internal xfs_buf_t object manipulation
  */
 
@@ -333,7 +264,7 @@ xfs_buf_free(
                uint            i;
 
                if ((bp->b_flags & XBF_MAPPED) && (bp->b_page_count > 1))
-                       free_address(bp->b_addr - bp->b_offset);
+                       vunmap(bp->b_addr - bp->b_offset);
 
                for (i = 0; i < bp->b_page_count; i++) {
                        struct page     *page = bp->b_pages[i];
@@ -455,8 +386,6 @@ _xfs_buf_map_pages(
                bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
                bp->b_flags |= XBF_MAPPED;
        } else if (flags & XBF_MAPPED) {
-               if (as_list_len > 64)
-                       purge_addresses();
                bp->b_addr = vmap(bp->b_pages, bp->b_page_count,
                                        VM_MAP, PAGE_KERNEL);
                if (unlikely(bp->b_addr == NULL))
@@ -1743,8 +1672,6 @@ xfsbufd(
                        count++;
                }
 
-               if (as_list_len > 0)
-                       purge_addresses();
                if (count)
                        blk_run_address_space(target->bt_mapping);