dm btree: use GFP_NOFS in dm_btree_del()

dm_btree_del() is called from an ioctl so don't recurse into FS.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index 20a4032..1744f36 100644 (file)
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -272,7 +272,12 @@ int dm_btree_del(struct dm_btree_info *info, dm_block_t root)
        int r;
        struct del_stack *s;
 
-       s = kmalloc(sizeof(*s), GFP_NOIO);
+       /*
+        * dm_btree_del() is called via an ioctl, as such should be
+        * considered an FS op.  We can't recurse back into the FS, so we
+        * allocate GFP_NOFS.
+        */
+       s = kmalloc(sizeof(*s), GFP_NOFS);
        if (!s)
                return -ENOMEM;
        s->info = info;