Btrfs: deal with io_tree->mapping being NULL

I need to add infrastructure to allocate dummy extent buffers for running sanity
tests, and to do this I need to not have to worry about having an
address_mapping for an io_tree, so just fix up the places where we assume that
all io_tree's have a non-NULL ->mapping.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5fc9481515f3..1d8244d39b66 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -77,13 +77,19 @@ void btrfs_leak_debug_check(void)
         }
 }
 
-#define btrfs_debug_check_extent_io_range(inode, start, end)            \
-        __btrfs_debug_check_extent_io_range(__func__, (inode), (start), (end))
+#define btrfs_debug_check_extent_io_range(tree, start, end)             \
+        __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end))
 static inline void __btrfs_debug_check_extent_io_range(const char *caller,
-                struct inode *inode, u64 start, u64 end)
+                struct extent_io_tree *tree, u64 start, u64 end)
 {
-        u64 isize = i_size_read(inode);
+        struct inode *inode;
+        u64 isize;
 
+        if (!tree->mapping)
+                return;
+
+        inode = tree->mapping->host;
+        isize = i_size_read(inode);
         if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) {
                 printk_ratelimited(KERN_DEBUG
                     "btrfs: %s: ino %llu isize %llu odd range [%llu,%llu]\n",
@@ -124,6 +130,8 @@ static noinline void flush_write_bio(void *data);
 static inline struct btrfs_fs_info *
 tree_fs_info(struct extent_io_tree *tree)
 {
+        if (!tree->mapping)
+                return NULL;
         return btrfs_sb(tree->mapping->host->i_sb);
 }
 
@@ -570,7 +578,7 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
         int err;
         int clear = 0;
 
-        btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+        btrfs_debug_check_extent_io_range(tree, start, end);
 
         if (bits & EXTENT_DELALLOC)
                 bits |= EXTENT_NORESERVE;
@@ -730,7 +738,7 @@ static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
         struct extent_state *state;
         struct rb_node *node;
 
-        btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+        btrfs_debug_check_extent_io_range(tree, start, end);
 
         spin_lock(&tree->lock);
 again:
@@ -817,7 +825,7 @@ __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
         u64 last_start;
         u64 last_end;
 
-        btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+        btrfs_debug_check_extent_io_range(tree, start, end);
 
         bits |= EXTENT_FIRST_DELALLOC;
 again:
@@ -1043,7 +1051,7 @@ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
         u64 last_start;
         u64 last_end;
 
-        btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+        btrfs_debug_check_extent_io_range(tree, start, end);
 
 again:
         if (!prealloc && (mask & __GFP_WAIT)) {