bcachefs: Kill journal buf bloom filter

This was used for recording which inodes have been modified by in flight
journal writes, but was broken and has been superceded.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/btree_update_leaf.c

@@ -363,9 +363,6 @@ static inline void do_btree_insert_one(struct btree_trans *trans,
 				      i->level,
 				      i->k);
 
-		bch2_journal_set_has_inode(j, &trans->journal_res,
-					   i->k->k.p.inode);
-
 		if (trans->journal_seq)
 			*trans->journal_seq = trans->journal_res.seq;
 	}

fs/bcachefs/fs.c

@@ -58,8 +58,6 @@ static void journal_seq_copy(struct bch_fs *c,
 		if (old >= journal_seq)
 			break;
 	} while ((v = atomic64_cmpxchg(dst_seq, old, journal_seq)) != old);
-
-	bch2_journal_set_has_inum(&c->journal, dst->v.i_ino, journal_seq);
 }
 
 static void __pagecache_lock_put(struct pagecache_lock *lock, long i)
@@ -258,8 +256,6 @@ struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
 
 	bch2_vfs_inode_init(c, inum, inode, &inode_u);
 
-	inode->ei_journal_seq = bch2_inode_journal_seq(&c->journal, inum.inum);
-
 	unlock_new_inode(&inode->v);
 
 	return &inode->v;

fs/bcachefs/journal.c

@@ -87,8 +87,6 @@ static void bch2_journal_buf_init(struct journal *j)
 	buf->must_flush	= false;
 	buf->separate_flush = false;
 
-	memset(buf->has_inode, 0, sizeof(buf->has_inode));
-
 	memset(buf->data, 0, sizeof(*buf->data));
 	buf->data->seq	= cpu_to_le64(journal_cur_seq(j));
 	buf->data->u64s	= 0;
@@ -334,55 +332,6 @@ static void journal_write_work(struct work_struct *work)
 	journal_entry_close(j);
 }
 
-/*
- * Given an inode number, if that inode number has data in the journal that
- * hasn't yet been flushed, return the journal sequence number that needs to be
- * flushed:
- */
-u64 bch2_inode_journal_seq(struct journal *j, u64 inode)
-{
-	size_t h = hash_64(inode, ilog2(sizeof(j->buf[0].has_inode) * 8));
-	union journal_res_state s;
-	unsigned i;
-	u64 seq;
-
-
-	spin_lock(&j->lock);
-	seq = journal_cur_seq(j);
-	s = READ_ONCE(j->reservations);
-	i = s.idx;
-
-	while (1) {
-		if (test_bit(h, j->buf[i].has_inode))
-			goto out;
-
-		if (i == s.unwritten_idx)
-			break;
-
-		i = (i - 1) & JOURNAL_BUF_MASK;
-		seq--;
-	}
-
-	seq = 0;
-out:
-	spin_unlock(&j->lock);
-
-	return seq;
-}
-
-void bch2_journal_set_has_inum(struct journal *j, u64 inode, u64 seq)
-{
-	size_t h = hash_64(inode, ilog2(sizeof(j->buf[0].has_inode) * 8));
-	struct journal_buf *buf;
-
-	spin_lock(&j->lock);
-
-	if ((buf = journal_seq_to_buf(j, seq)))
-		set_bit(h, buf->has_inode);
-
-	spin_unlock(&j->lock);
-}
-
 static int __journal_res_get(struct journal *j, struct journal_res *res,
 			     unsigned flags)
 {

fs/bcachefs/journal.h

@@ -141,9 +141,6 @@ static inline u64 journal_cur_seq(struct journal *j)
 	return j->pin.back - 1;
 }
 
-u64 bch2_inode_journal_seq(struct journal *, u64);
-void bch2_journal_set_has_inum(struct journal *, u64, u64);
-
 static inline int journal_state_count(union journal_res_state s, int idx)
 {
 	switch (idx) {
@@ -163,18 +160,6 @@ static inline void journal_state_inc(union journal_res_state *s)
 	s->buf3_count += s->idx == 3;
 }
 
-static inline void bch2_journal_set_has_inode(struct journal *j,
-					      struct journal_res *res,
-					      u64 inum)
-{
-	struct journal_buf *buf = &j->buf[res->idx];
-	unsigned long bit = hash_64(inum, ilog2(sizeof(buf->has_inode) * 8));
-
-	/* avoid atomic op if possible */
-	if (unlikely(!test_bit(bit, buf->has_inode)))
-		set_bit(bit, buf->has_inode);
-}
-
 /*
  * Amount of space that will be taken up by some keys in the journal (i.e.
  * including the jset header)

fs/bcachefs/journal_types.h

@@ -34,8 +34,6 @@ struct journal_buf {
 	bool			noflush;	/* write has already been kicked off, and was noflush */
 	bool			must_flush;	/* something wants a flush */
 	bool			separate_flush;
-	/* bloom filter: */
-	unsigned long		has_inode[1024 / sizeof(unsigned long)];
 };
 
 /*