Btrfs: fix spinlock assertions on UP systems

btrfs_tree_locked was being used to make sure a given extent_buffer was
properly locked in a few places.  But, it wasn't correct for UP compiled
kernels.

This switches it to using assert_spin_locked instead, and renames it to
btrfs_assert_tree_locked to better reflect how it was really being used.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 42491d7..37f31b5 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -277,7 +277,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
        if (*cow_ret == buf)
                unlock_orig = 1;
 
-       WARN_ON(!btrfs_tree_locked(buf));
+       btrfs_assert_tree_locked(buf);
 
        if (parent)
                parent_start = parent->start;
@@ -2365,7 +2365,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
        if (slot >= btrfs_header_nritems(upper) - 1)
                return 1;
 
-       WARN_ON(!btrfs_tree_locked(path->nodes[1]));
+       btrfs_assert_tree_locked(path->nodes[1]);
 
        right = read_node_slot(root, upper, slot + 1);
        btrfs_tree_lock(right);
@@ -2562,7 +2562,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
        if (right_nritems == 0)
                return 1;
 
-       WARN_ON(!btrfs_tree_locked(path->nodes[1]));
+       btrfs_assert_tree_locked(path->nodes[1]);
 
        left = read_node_slot(root, path->nodes[1], slot - 1);
        btrfs_tree_lock(left);
@@ -4101,7 +4101,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 
                next = read_node_slot(root, c, slot);
                if (!path->skip_locking) {
-                       WARN_ON(!btrfs_tree_locked(c));
+                       btrfs_assert_tree_locked(c);
                        btrfs_tree_lock(next);
                        btrfs_set_lock_blocking(next);
                }
@@ -4126,7 +4126,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
                        reada_for_search(root, path, level, slot, 0);
                next = read_node_slot(root, next, 0);
                if (!path->skip_locking) {
-                       WARN_ON(!btrfs_tree_locked(path->nodes[level]));
+                       btrfs_assert_tree_locked(path->nodes[level]);
                        btrfs_tree_lock(next);
                        btrfs_set_lock_blocking(next);
                }

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index adda739..3e18175 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -857,7 +857,7 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
        struct inode *btree_inode = root->fs_info->btree_inode;
        if (btrfs_header_generation(buf) ==
            root->fs_info->running_transaction->transid) {
-               WARN_ON(!btrfs_tree_locked(buf));
+               btrfs_assert_tree_locked(buf);
 
                /* ugh, clear_extent_buffer_dirty can be expensive */
                btrfs_set_lock_blocking(buf);
@@ -2361,7 +2361,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
 
        btrfs_set_lock_blocking(buf);
 
-       WARN_ON(!btrfs_tree_locked(buf));
+       btrfs_assert_tree_locked(buf);
        if (transid != root->fs_info->generation) {
                printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
                       "found %llu running %llu\n",

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6b5966a..9abf81f 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4418,13 +4418,13 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
        path = btrfs_alloc_path();
        BUG_ON(!path);
 
-       BUG_ON(!btrfs_tree_locked(parent));
+       btrfs_assert_tree_locked(parent);
        parent_level = btrfs_header_level(parent);
        extent_buffer_get(parent);
        path->nodes[parent_level] = parent;
        path->slots[parent_level] = btrfs_header_nritems(parent);
 
-       BUG_ON(!btrfs_tree_locked(node));
+       btrfs_assert_tree_locked(node);
        level = btrfs_header_level(node);
        extent_buffer_get(node);
        path->nodes[level] = node;

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 85506c4..47b0a88 100644 (file)
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -220,8 +220,8 @@ int btrfs_tree_unlock(struct extent_buffer *eb)
        return 0;
 }
 
-int btrfs_tree_locked(struct extent_buffer *eb)
+void btrfs_assert_tree_locked(struct extent_buffer *eb)
 {
-       return test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags) ||
-                       spin_is_locked(&eb->lock);
+       if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+               assert_spin_locked(&eb->lock);
 }

diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h
index 6bb0afb..6c4ce45 100644 (file)
--- a/fs/btrfs/locking.h
+++ b/fs/btrfs/locking.h
@@ -21,11 +21,11 @@
 
 int btrfs_tree_lock(struct extent_buffer *eb);
 int btrfs_tree_unlock(struct extent_buffer *eb);
-int btrfs_tree_locked(struct extent_buffer *eb);
 
 int btrfs_try_tree_lock(struct extent_buffer *eb);
 int btrfs_try_spin_lock(struct extent_buffer *eb);
 
 void btrfs_set_lock_blocking(struct extent_buffer *eb);
 void btrfs_clear_lock_blocking(struct extent_buffer *eb);
+void btrfs_assert_tree_locked(struct extent_buffer *eb);
 #endif