Merge branch 'pm-cpufreq'

[cascardo/linux.git] / fs / xfs / kmem.c

diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index 66a36be..844e288 100644 (file)
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -65,12 +65,31 @@ kmem_alloc(size_t size, xfs_km_flags_t flags)
 void *
 kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
 {
+       unsigned noio_flag = 0;
        void    *ptr;
+       gfp_t   lflags;
 
        ptr = kmem_zalloc(size, flags | KM_MAYFAIL);
        if (ptr)
                return ptr;
-       return vzalloc(size);
+
+       /*
+        * __vmalloc() will allocate data pages and auxillary structures (e.g.
+        * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context
+        * here. Hence we need to tell memory reclaim that we are in such a
+        * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
+        * the filesystem here and potentially deadlocking.
+        */
+       if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
+               noio_flag = memalloc_noio_save();
+
+       lflags = kmem_flags_convert(flags);
+       ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
+
+       if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
+               memalloc_noio_restore(noio_flag);
+
+       return ptr;
 }
 
 void