Merge branch 'for-linus-min' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

Pull the minimal btrfs branch from Chris Mason:
 "We have a use-after-free in there, along with errors when mount -o
  discard is enabled, and a BUG_ON(we should compile with UP more
  often)."

* 'for-linus-min' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: use commit root when loading free space cache
  Btrfs: fix use-after-free in __btrfs_end_transaction
  Btrfs: check return value of bio_alloc() properly
  Btrfs: remove lock assert from get_restripe_target()
  Btrfs: fix eof while discarding extents
  Btrfs: fix uninit variable in repair_eb_io_failure
  Revert "Btrfs: increase the global block reserve estimates"

1 files changed, 2 insertions, 7 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index e88330d3df52..202008ec367d 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -748,13 +748,6 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
         u64 used = btrfs_block_group_used(&block_group->item);
 
         /*
-         * If we're unmounting then just return, since this does a search on the
-         * normal root and not the commit root and we could deadlock.
-         */
-        if (btrfs_fs_closing(fs_info))
-                return 0;
-
-        /*
          * If this block group has been marked to be cleared for one reason or
          * another then we can't trust the on disk cache, so just return.
          */
@@ -768,6 +761,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
         path = btrfs_alloc_path();
         if (!path)
                 return 0;
+        path->search_commit_root = 1;
+        path->skip_locking = 1;
 
         inode = lookup_free_space_inode(root, block_group, path);
         if (IS_ERR(inode)) {