Update bcachefs sources to 3e0c5b0722 fixup! bcachefs: Btree write buffer

[bcachefs-tools-debian] / libbcachefs / backpointers.h

diff --git a/libbcachefs/backpointers.h b/libbcachefs/backpointers.h
index ac7b09321aabee73a3b8d7349b3fe3ebebc0866a..ded1ab7fb0bc0e1dad331e01f1539427dea3bf3d 100644 (file)
--- a/libbcachefs/backpointers.h
+++ b/libbcachefs/backpointers.h
@@ -2,6 +2,8 @@
 #ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H
 #define _BCACHEFS_BACKPOINTERS_BACKGROUND_H
 
+#include "btree_iter.h"
+#include "btree_update.h"
 #include "buckets.h"
 #include "super.h"
 
@@ -19,6 +21,81 @@ void bch2_backpointer_swab(struct bkey_s);
 
 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT                10
 
+/*
+ * Convert from pos in backpointer btree to pos of corresponding bucket in alloc
+ * btree:
+ */
+static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
+                                          struct bpos bp_pos)
+{
+       struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
+       u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
+
+       return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
+}
+
+/*
+ * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
+ */
+static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
+                                          struct bpos bucket,
+                                          u64 bucket_offset)
+{
+       struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
+       struct bpos ret;
+
+       ret = POS(bucket.inode,
+                 (bucket_to_sector(ca, bucket.offset) <<
+                  MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
+
+       BUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
+
+       return ret;
+}
+
+bool bch2_bucket_backpointer_del(struct btree_trans *,
+                               struct bkey_i_alloc_v4 *,
+                               struct bch_backpointer);
+
+int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *,
+                               struct bkey_i_alloc_v4 *,
+                               struct bch_backpointer, struct bkey_s_c, bool);
+
+static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
+                               struct bkey_i_alloc_v4 *a,
+                               struct bch_backpointer bp,
+                               struct bkey_s_c orig_k,
+                               bool insert)
+{
+       struct bch_fs *c = trans->c;
+       struct bkey_i_backpointer *bp_k;
+       int ret;
+
+       if (!insert &&
+           unlikely(BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v)) &&
+           bch2_bucket_backpointer_del(trans, a, bp))
+               return 0;
+
+       if (unlikely(bch2_backpointers_no_use_write_buffer))
+               return bch2_bucket_backpointer_mod_nowritebuffer(trans, a, bp, orig_k, insert);
+
+       bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
+       ret = PTR_ERR_OR_ZERO(bp_k);
+       if (ret)
+               return ret;
+
+       bkey_backpointer_init(&bp_k->k_i);
+       bp_k->k.p = bucket_pos_to_bp(c, a->k.p, bp.bucket_offset);
+       bp_k->v = bp;
+
+       if (!insert) {
+               bp_k->k.type = KEY_TYPE_deleted;
+               set_bkey_val_u64s(&bp_k->k, 0);
+       }
+
+       return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i);
+}
+
 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
                           enum btree_id btree_id, unsigned level,
                           struct bkey_s_c k, struct extent_ptr_decoded p,
@@ -40,10 +117,6 @@ static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
        };
 }
 
-int bch2_bucket_backpointer_del(struct btree_trans *, struct bkey_i_alloc_v4 *,
-                               struct bch_backpointer, struct bkey_s_c);
-int bch2_bucket_backpointer_add(struct btree_trans *, struct bkey_i_alloc_v4 *,
-                               struct bch_backpointer, struct bkey_s_c);
 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
                              u64 *, struct bch_backpointer *, unsigned);
 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,