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-rw-r--r--fs/bcachefs/backpointers.h140
1 files changed, 140 insertions, 0 deletions
diff --git a/fs/bcachefs/backpointers.h b/fs/bcachefs/backpointers.h
new file mode 100644
index 0000000000..ab866feeaf
--- /dev/null
+++ b/fs/bcachefs/backpointers.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H
+#define _BCACHEFS_BACKPOINTERS_BACKGROUND_H
+
+#include "btree_iter.h"
+#include "btree_update.h"
+#include "buckets.h"
+#include "super.h"
+
+static inline u64 swab40(u64 x)
+{
+ return (((x & 0x00000000ffULL) << 32)|
+ ((x & 0x000000ff00ULL) << 16)|
+ ((x & 0x0000ff0000ULL) >> 0)|
+ ((x & 0x00ff000000ULL) >> 16)|
+ ((x & 0xff00000000ULL) >> 32));
+}
+
+int bch2_backpointer_invalid(struct bch_fs *, struct bkey_s_c k,
+ enum bkey_invalid_flags, struct printbuf *);
+void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *);
+void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
+void bch2_backpointer_swab(struct bkey_s);
+
+#define bch2_bkey_ops_backpointer ((struct bkey_ops) { \
+ .key_invalid = bch2_backpointer_invalid, \
+ .val_to_text = bch2_backpointer_k_to_text, \
+ .swab = bch2_backpointer_swab, \
+ .min_val_size = 32, \
+})
+
+#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);
+
+ EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
+
+ return ret;
+}
+
+int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bkey_i_backpointer *,
+ struct bch_backpointer, struct bkey_s_c, bool);
+
+static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
+ struct bpos bucket,
+ 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;
+
+ 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, bucket, bp.bucket_offset);
+ bp_k->v = bp;
+
+ if (!insert) {
+ bp_k->k.type = KEY_TYPE_deleted;
+ set_bkey_val_u64s(&bp_k->k, 0);
+ }
+
+ if (unlikely(bch2_backpointers_no_use_write_buffer))
+ return bch2_bucket_backpointer_mod_nowritebuffer(trans, bp_k, bp, orig_k, insert);
+
+ return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i);
+}
+
+static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level,
+ struct bkey_s_c k, struct extent_ptr_decoded p)
+{
+ return level ? BCH_DATA_btree :
+ p.has_ec ? BCH_DATA_stripe :
+ BCH_DATA_user;
+}
+
+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,
+ struct bpos *bucket_pos, struct bch_backpointer *bp)
+{
+ enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p);
+ s64 sectors = level ? btree_sectors(c) : k.k->size;
+ u32 bucket_offset;
+
+ *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
+ *bp = (struct bch_backpointer) {
+ .btree_id = btree_id,
+ .level = level,
+ .data_type = data_type,
+ .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
+ p.crc.offset,
+ .bucket_len = ptr_disk_sectors(sectors, p),
+ .pos = k.k->p,
+ };
+}
+
+int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
+ struct bpos *, struct bch_backpointer *, unsigned);
+struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
+ struct bpos, struct bch_backpointer,
+ unsigned);
+struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
+ struct bpos, struct bch_backpointer);
+
+int bch2_check_btree_backpointers(struct bch_fs *);
+int bch2_check_extents_to_backpointers(struct bch_fs *);
+int bch2_check_backpointers_to_extents(struct bch_fs *);
+
+#endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */