btrfs: protect space cache inode alloc with GFP_NOFS

If we're allocating a new space cache inode it's likely going to be
under a transaction handle, so we need to use memalloc_nofs_save() in
order to avoid deadlocks, and more importantly lockdep messages that
make xfstests fail.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index ed097ff023e8..a1f379e8ad13 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -10,6 +10,7 @@
 #include <linux/math64.h>
 #include <linux/ratelimit.h>
 #include <linux/error-injection.h>
+#include <linux/sched/mm.h>
 #include "ctree.h"
 #include "free-space-cache.h"
 #include "transaction.h"
@@ -47,6 +48,7 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
         struct btrfs_free_space_header *header;
         struct extent_buffer *leaf;
         struct inode *inode = NULL;
+        unsigned nofs_flag;
         int ret;
 
         key.objectid = BTRFS_FREE_SPACE_OBJECTID;
@@ -68,7 +70,13 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
         btrfs_disk_key_to_cpu(&location, &disk_key);
         btrfs_release_path(path);
 
+        /*
+         * We are often under a trans handle at this point, so we need to make
+         * sure NOFS is set to keep us from deadlocking.
+         */
+        nofs_flag = memalloc_nofs_save();
         inode = btrfs_iget(fs_info->sb, &location, root, NULL);
+        memalloc_nofs_restore(nofs_flag);
         if (IS_ERR(inode))
                 return inode;