btrfs: save irq flags when looking up an ordered extent

A following patch will add another caller of
btrfs_lookup_ordered_extent(), but from a bio's endio context.

btrfs_lookup_ordered_extent() uses spin_lock_irq() which unconditionally
disables interrupts. Change this to spin_lock_irqsave() so interrupts
aren't disabled and re-enabled unconditionally.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 2dc707f..fe235ab 100644 (file)
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -767,9 +767,10 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *ino
        struct btrfs_ordered_inode_tree *tree;
        struct rb_node *node;
        struct btrfs_ordered_extent *entry = NULL;
+       unsigned long flags;
 
        tree = &inode->ordered_tree;
-       spin_lock_irq(&tree->lock);
+       spin_lock_irqsave(&tree->lock, flags);
        node = tree_search(tree, file_offset);
        if (!node)
                goto out;
@@ -780,7 +781,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *ino
        if (entry)
                refcount_inc(&entry->refs);
 out:
-       spin_unlock_irq(&tree->lock);
+       spin_unlock_irqrestore(&tree->lock, flags);
        return entry;
 }