change wifi driver to cypress

hc

2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390

 kernel/fs/btrfs/locking.h
..
..
@@ -6,24 +6,118 @@
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 #ifndef BTRFS_LOCKING_H
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 #define BTRFS_LOCKING_H
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+#include <linux/atomic.h>
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+#include <linux/wait.h>
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+#include <linux/percpu_counter.h>
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+#include "extent_io.h"
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+
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 #define BTRFS_WRITE_LOCK 1
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 #define BTRFS_READ_LOCK 2
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 #define BTRFS_WRITE_LOCK_BLOCKING 3
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 #define BTRFS_READ_LOCK_BLOCKING 4
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+/*
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+ * We are limited in number of subclasses by MAX_LOCKDEP_SUBCLASSES, which at
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+ * the time of this patch is 8, which is how many we use.  Keep this in mind if
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+ * you decide you want to add another subclass.
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+ */
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+enum btrfs_lock_nesting {
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+	BTRFS_NESTING_NORMAL,
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+
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+	/*
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+	 * When we COW a block we are holding the lock on the original block,
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+	 * and since our lockdep maps are rootid+level, this confuses lockdep
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+	 * when we lock the newly allocated COW'd block.  Handle this by having
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+	 * a subclass for COW'ed blocks so that lockdep doesn't complain.
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+	 */
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+	BTRFS_NESTING_COW,
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+
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+	/*
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+	 * Oftentimes we need to lock adjacent nodes on the same level while
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+	 * still holding the lock on the original node we searched to, such as
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+	 * for searching forward or for split/balance.
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+	 *
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+	 * Because of this we need to indicate to lockdep that this is
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+	 * acceptable by having a different subclass for each of these
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+	 * operations.
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+	 */
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+	BTRFS_NESTING_LEFT,
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+	BTRFS_NESTING_RIGHT,
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+
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+	/*
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+	 * When splitting we will be holding a lock on the left/right node when
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+	 * we need to cow that node, thus we need a new set of subclasses for
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+	 * these two operations.
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+	 */
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+	BTRFS_NESTING_LEFT_COW,
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+	BTRFS_NESTING_RIGHT_COW,
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+
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+	/*
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+	 * When splitting we may push nodes to the left or right, but still use
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+	 * the subsequent nodes in our path, keeping our locks on those adjacent
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+	 * blocks.  Thus when we go to allocate a new split block we've already
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+	 * used up all of our available subclasses, so this subclass exists to
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+	 * handle this case where we need to allocate a new split block.
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+	 */
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+	BTRFS_NESTING_SPLIT,
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+
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+	/*
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+	 * When promoting a new block to a root we need to have a special
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+	 * subclass so we don't confuse lockdep, as it will appear that we are
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+	 * locking a higher level node before a lower level one.  Copying also
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+	 * has this problem as it appears we're locking the same block again
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+	 * when we make a snapshot of an existing root.
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+	 */
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+	BTRFS_NESTING_NEW_ROOT,
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+
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+	/*
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+	 * We are limited to MAX_LOCKDEP_SUBLCLASSES number of subclasses, so
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+	 * add this in here and add a static_assert to keep us from going over
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+	 * the limit.  As of this writing we're limited to 8, and we're
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+	 * definitely using 8, hence this check to keep us from messing up in
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+	 * the future.
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+	 */
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+	BTRFS_NESTING_MAX,
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+};
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+
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+static_assert(BTRFS_NESTING_MAX <= MAX_LOCKDEP_SUBCLASSES,
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+	      "too many lock subclasses defined");
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+
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+struct btrfs_path;
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+
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+void __btrfs_tree_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
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 void btrfs_tree_lock(struct extent_buffer *eb);
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 void btrfs_tree_unlock(struct extent_buffer *eb);
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+void __btrfs_tree_read_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest,
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+			    bool recurse);
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 void btrfs_tree_read_lock(struct extent_buffer *eb);
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 void btrfs_tree_read_unlock(struct extent_buffer *eb);
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 void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
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-void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
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-void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
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-void btrfs_assert_tree_locked(struct extent_buffer *eb);
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+void btrfs_set_lock_blocking_read(struct extent_buffer *eb);
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+void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
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 int btrfs_try_tree_read_lock(struct extent_buffer *eb);
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 int btrfs_try_tree_write_lock(struct extent_buffer *eb);
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 int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
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+struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
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+struct extent_buffer *__btrfs_read_lock_root_node(struct btrfs_root *root,
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+						  bool recurse);
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+static inline struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root)
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+{
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+	return __btrfs_read_lock_root_node(root, false);
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+}
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+
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+#ifdef CONFIG_BTRFS_DEBUG
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+static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) {
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+	BUG_ON(!eb->write_locks);
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+}
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+#else
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+static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) { }
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+#endif
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+
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+void btrfs_set_path_blocking(struct btrfs_path *p);
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+void btrfs_unlock_up_safe(struct btrfs_path *path, int level);
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 static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
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 {
..
..
@@ -37,13 +131,19 @@
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 		BUG();
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 }
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-static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
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-{
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-	btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
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-}
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+struct btrfs_drew_lock {
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+	atomic_t readers;
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+	struct percpu_counter writers;
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+	wait_queue_head_t pending_writers;
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+	wait_queue_head_t pending_readers;
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+};
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-static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
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-{
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-	btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
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-}
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+int btrfs_drew_lock_init(struct btrfs_drew_lock *lock);
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+void btrfs_drew_lock_destroy(struct btrfs_drew_lock *lock);
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+void btrfs_drew_write_lock(struct btrfs_drew_lock *lock);
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+bool btrfs_drew_try_write_lock(struct btrfs_drew_lock *lock);
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+void btrfs_drew_write_unlock(struct btrfs_drew_lock *lock);
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+void btrfs_drew_read_lock(struct btrfs_drew_lock *lock);
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+void btrfs_drew_read_unlock(struct btrfs_drew_lock *lock);
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+
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 #endif