[PATCH 6/8] btrfs: Remove extent_io_ops::clear_bit_hook callback

[Nikolay Borisov]

This is the counterpart to ex-set_bit_hook (now btrfs_set_delalloc_extent),
similar to what was done before remove clear_bit_hook and rename the
function. No functional changes.

Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
 fs/btrfs/ctree.h     |  2 ++
 fs/btrfs/extent_io.c | 12 ++++--------
 fs/btrfs/extent_io.h |  3 ---
 fs/btrfs/inode.c     | 13 ++++++-------
 4 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8fd9db7aa8de..49d52180e14c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3152,6 +3152,8 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle 
*trans,
                             u64 new_dirid);
 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
                               unsigned *bits);
+void btrfs_clear_delalloc_extent(struct inode *inode,
+                                struct extent_state *state, unsigned *bits);
 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
                         size_t size, struct bio *bio,
                         unsigned long bio_flags);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 31bdc596e623..a3081c0ca3e3 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -404,13 +404,6 @@ static void merge_state(struct extent_io_tree *tree,
        }
 }
 
-static void clear_state_cb(struct extent_io_tree *tree,
-                          struct extent_state *state, unsigned *bits)
-{
-       if (tree->ops && tree->ops->clear_bit_hook)
-               tree->ops->clear_bit_hook(tree->private_data, state, bits);
-}
-
 static void set_state_bits(struct extent_io_tree *tree,
                           struct extent_state *state, unsigned *bits,
                           struct extent_changeset *changeset);
@@ -525,7 +518,10 @@ static struct extent_state *clear_state_bit(struct 
extent_io_tree *tree,
                WARN_ON(range > tree->dirty_bytes);
                tree->dirty_bytes -= range;
        }
-       clear_state_cb(tree, state, bits);
+
+       if (tree->private_data)
+               btrfs_clear_delalloc_extent(tree->private_data, state, bits);
+
        ret = add_extent_changeset(state, bits_to_clear, changeset, 0);
        BUG_ON(ret < 0);
        state->state &= ~bits_to_clear;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index b3235d46b5c3..a3a3302f3625 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -106,9 +106,6 @@ struct extent_io_ops {
        /*
         * Optional hooks, called if the pointer is not NULL
         */
-       void (*clear_bit_hook)(void *private_data,
-                       struct extent_state *state,
-                       unsigned *bits);
        void (*merge_extent_hook)(void *private_data,
                                  struct extent_state *new,
                                  struct extent_state *other);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d1c56c56a413..41c655cd9d23 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1808,14 +1808,14 @@ void btrfs_set_delalloc_extent(struct inode *inode, 
struct extent_state *state,
 }
 
 /*
- * extent_io.c clear_bit_hook, see set_bit_hook for why
+ * Once a range is no longer delalloc this function ensures proper accounting
+ * happens.
  */
-static void btrfs_clear_bit_hook(void *private_data,
-                                struct extent_state *state,
-                                unsigned *bits)
+void btrfs_clear_delalloc_extent(struct inode *vfs_inode,
+                                struct extent_state *state, unsigned *bits)
 {
-       struct btrfs_inode *inode = BTRFS_I((struct inode *)private_data);
-       struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
+       struct btrfs_inode *inode = BTRFS_I(vfs_inode);
+       struct btrfs_fs_info *fs_info = btrfs_sb(vfs_inode->i_sb);
        u64 len = state->end + 1 - state->start;
        u32 num_extents = count_max_extents(len);
 
@@ -10505,7 +10505,6 @@ static const struct extent_io_ops btrfs_extent_io_ops = 
{
        .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
 
        /* optional callbacks */
-       .clear_bit_hook = btrfs_clear_bit_hook,
        .merge_extent_hook = btrfs_merge_extent_hook,
        .split_extent_hook = btrfs_split_extent_hook,
 };
-- 
2.7.4