-#ifndef _BCACHE_BTREE_TYPES_H
-#define _BCACHE_BTREE_TYPES_H
+#ifndef _BCACHEFS_BTREE_TYPES_H
+#define _BCACHEFS_BTREE_TYPES_H
#include <linux/list.h>
#include <linux/rhashtable.h>
#include "six.h"
struct open_bucket;
-struct btree_interior_update;
+struct btree_update;
#define MAX_BSETS 3U
struct closure_waitlist wait;
};
+struct btree_ob_ref {
+ u8 nr;
+ u8 refs[BCH_REPLICAS_MAX];
+};
+
+struct btree_alloc {
+ struct btree_ob_ref ob;
+ BKEY_PADDED(k);
+};
+
struct btree {
/* Hottest entries first */
struct rhash_head hash;
* node to point to them: we update the parent in memory immediately,
* but then we must wait until the children have been written out before
* the update to the parent can be written - this is a list of the
- * btree_interior_updates that are blocking this node from being
+ * btree_updates that are blocking this node from being
* written:
*/
struct list_head write_blocked;
- struct open_bucket *ob;
+ /*
+ * Also for asynchronous splits/interior node updates:
+ * If a btree node isn't reachable yet, we don't want to kick off
+ * another write - because that write also won't yet be reachable and
+ * marking it as completed before it's reachable would be incorrect:
+ */
+ struct btree_update *will_make_reachable;
+
+ struct btree_ob_ref ob;
/* lru list */
struct list_head list;
#endif
};
+struct btree_cache {
+ struct rhashtable table;
+ bool table_init_done;
+ /*
+ * We never free a struct btree, except on shutdown - we just put it on
+ * the btree_cache_freed list and reuse it later. This simplifies the
+ * code, and it doesn't cost us much memory as the memory usage is
+ * dominated by buffers that hold the actual btree node data and those
+ * can be freed - and the number of struct btrees allocated is
+ * effectively bounded.
+ *
+ * btree_cache_freeable effectively is a small cache - we use it because
+ * high order page allocations can be rather expensive, and it's quite
+ * common to delete and allocate btree nodes in quick succession. It
+ * should never grow past ~2-3 nodes in practice.
+ */
+ struct mutex lock;
+ struct list_head live;
+ struct list_head freeable;
+ struct list_head freed;
+
+ /* Number of elements in live + freeable lists */
+ unsigned used;
+ unsigned reserve;
+ struct shrinker shrink;
+
+ /*
+ * If we need to allocate memory for a new btree node and that
+ * allocation fails, we can cannibalize another node in the btree cache
+ * to satisfy the allocation - lock to guarantee only one thread does
+ * this at a time:
+ */
+ struct task_struct *alloc_lock;
+ struct closure_waitlist alloc_wait;
+};
+
#define BTREE_FLAG(flag) \
static inline bool btree_node_ ## flag(struct btree *b) \
{ return test_bit(BTREE_NODE_ ## flag, &b->flags); } \
{ clear_bit(BTREE_NODE_ ## flag, &b->flags); }
enum btree_flags {
+ BTREE_NODE_read_in_flight,
BTREE_NODE_read_error,
- BTREE_NODE_write_error,
BTREE_NODE_dirty,
+ BTREE_NODE_need_write,
BTREE_NODE_noevict,
BTREE_NODE_write_idx,
BTREE_NODE_accessed,
BTREE_NODE_write_in_flight,
BTREE_NODE_just_written,
+ BTREE_NODE_dying,
};
+BTREE_FLAG(read_in_flight);
BTREE_FLAG(read_error);
-BTREE_FLAG(write_error);
BTREE_FLAG(dirty);
+BTREE_FLAG(need_write);
BTREE_FLAG(noevict);
BTREE_FLAG(write_idx);
BTREE_FLAG(accessed);
BTREE_FLAG(write_in_flight);
BTREE_FLAG(just_written);
+BTREE_FLAG(dying);
static inline struct btree_write *btree_current_write(struct btree *b)
{
struct btree_root {
struct btree *b;
- struct btree_interior_update *as;
+ struct btree_update *as;
/* On disk root - see async splits: */
__BKEY_PADDED(key, BKEY_BTREE_PTR_VAL_U64s_MAX);
struct btree_iter;
struct btree_node_iter;
-enum extent_insert_hook_ret {
- BTREE_HOOK_DO_INSERT,
- BTREE_HOOK_NO_INSERT,
- BTREE_HOOK_RESTART_TRANS,
-};
-
-struct extent_insert_hook {
- enum extent_insert_hook_ret
- (*fn)(struct extent_insert_hook *, struct bpos, struct bpos,
- struct bkey_s_c, const struct bkey_i *);
-};
-
enum btree_insert_ret {
BTREE_INSERT_OK,
/* extent spanned multiple leaf nodes: have to traverse to next node: */
BTREE_INSERT_NEED_GC_LOCK,
};
+struct extent_insert_hook {
+ enum btree_insert_ret
+ (*fn)(struct extent_insert_hook *, struct bpos, struct bpos,
+ struct bkey_s_c, const struct bkey_i *);
+};
+
enum btree_gc_coalesce_fail_reason {
BTREE_GC_COALESCE_FAIL_RESERVE_GET,
BTREE_GC_COALESCE_FAIL_KEYLIST_REALLOC,
BTREE_GC_COALESCE_FAIL_FORMAT_FITS,
};
+enum btree_node_sibling {
+ btree_prev_sib,
+ btree_next_sib,
+};
+
typedef struct btree_nr_keys (*sort_fix_overlapping_fn)(struct bset *,
struct btree *,
struct btree_node_iter *);
-#endif /* _BCACHE_BTREE_TYPES_H */
+#endif /* _BCACHEFS_BTREE_TYPES_H */
projects / bcachefs-tools-debian / blobdiff