1 files changed, 34 insertions, 2 deletions

diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index ce84ffd0264c..0f0df2759b09 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -35,6 +35,7 @@
 #include "xfs_error.h"
 #include "xfs_trace.h"
 
+struct workqueue_struct *xfs_alloc_wq;
 
 #define XFS_ABSDIFF(a,b)        (((a) <= (b)) ? ((b) - (a)) : ((a) - (b)))
 
@@ -68,7 +69,7 @@ xfs_alloc_lookup_eq(
  * Lookup the first record greater than or equal to [bno, len]
  * in the btree given by cur.
  */
-STATIC int                              /* error */
+int                             /* error */
 xfs_alloc_lookup_ge(
         struct xfs_btree_cur    *cur,   /* btree cursor */
         xfs_agblock_t           bno,    /* starting block of extent */
@@ -2207,7 +2208,7 @@ xfs_alloc_read_agf(
  * group or loop over the allocation groups to find the result.
  */
 int                             /* error */
-xfs_alloc_vextent(
+__xfs_alloc_vextent(
         xfs_alloc_arg_t *args)  /* allocation argument structure */
 {
         xfs_agblock_t   agsize; /* allocation group size */
@@ -2417,6 +2418,37 @@ error0:
         return error;
 }
 
+static void
+xfs_alloc_vextent_worker(
+        struct work_struct      *work)
+{
+        struct xfs_alloc_arg    *args = container_of(work,
+                                                struct xfs_alloc_arg, work);
+        unsigned long           pflags;
+
+        /* we are in a transaction context here */
+        current_set_flags_nested(&pflags, PF_FSTRANS);
+
+        args->result = __xfs_alloc_vextent(args);
+        complete(args->done);
+
+        current_restore_flags_nested(&pflags, PF_FSTRANS);
+}
+
+
+int                             /* error */
+xfs_alloc_vextent(
+        xfs_alloc_arg_t *args)  /* allocation argument structure */
+{
+        DECLARE_COMPLETION_ONSTACK(done);
+
+        args->done = &done;
+        INIT_WORK(&args->work, xfs_alloc_vextent_worker);
+        queue_work(xfs_alloc_wq, &args->work);
+        wait_for_completion(&done);
+        return args->result;
+}
+
 /*
  * Free an extent.
  * Just break up the extent address and hand off to xfs_free_ag_extent