nilfs2: fix lockdep warning between regular file and inode file

This will fix the following false positive of recursive locking which
lockdep has detected:

=============================================
[ INFO: possible recursive locking detected ]
2.6.30-nilfs #42
---------------------------------------------
nilfs_cleanerd/10607 is trying to acquire lock:
 (&bmap->b_sem){++++-.}, at: [<e0d025b7>] nilfs_bmap_lookup_at_level+0x1a/0x74 [nilfs2]

but task is already holding lock:
 (&bmap->b_sem){++++-.}, at: [<e0d024e0>] nilfs_bmap_truncate+0x19/0x6a [nilfs2]
other info that might help us debug this:
2 locks held by nilfs_cleanerd/10607:
 #0:  (&nilfs->ns_segctor_sem){++++.+}, at: [<e0d0d75a>] nilfs_transaction_begin+0xb6/0x10c [nilfs2]
 #1:  (&bmap->b_sem){++++-.}, at: [<e0d024e0>] nilfs_bmap_truncate+0x19/0x6a [nilfs2]

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
index 36df60b6d8a..99d58a028b9 100644
--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -568,6 +568,7 @@ void nilfs_bmap_abort_update_v(struct nilfs_bmap *bmap,
 }
 
 static struct lock_class_key nilfs_bmap_dat_lock_key;
+static struct lock_class_key nilfs_bmap_mdt_lock_key;
 
 /**
  * nilfs_bmap_read - read a bmap from an inode
@@ -603,7 +604,11 @@ int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
                 bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
                 bmap->b_last_allocated_key = 0;
                 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
+                lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
                 break;
+        case NILFS_IFILE_INO:
+                lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
+                /* Fall through */
         default:
                 bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
                 bmap->b_last_allocated_key = 0;