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bcachefs: Kill for_each_btree_key()

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for_each_btree_key() handles transaction restarts, like
for_each_btree_key2(), but only calls bch2_trans_begin() after a
transaction restart - for_each_btree_key2() wraps every loop iteration
in a transaction.

The for_each_btree_key() behaviour is problematic when it leads to
holding the SRCU lock that prevents key cache reclaim for an unbounded
amount of time - there's no real need to keep it around.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2023-12-07 23:28:26 -05:00
parent 8c066edeb4
commit 27b2df982f
9 changed files with 152 additions and 177 deletions
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11
fs/bcachefs/move.c
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@@ -377,8 +377,8 @@ struct bch_io_opts *bch2_move_get_io_opts(struct btree_trans *trans,
io_opts->d.nr = 0;
for_each_btree_key(trans, iter, BTREE_ID_inodes, POS(0, extent_k.k->p.inode),
BTREE_ITER_ALL_SNAPSHOTS, k, ret) {
ret = for_each_btree_key2(trans, iter, BTREE_ID_inodes, POS(0, extent_k.k->p.inode),
BTREE_ITER_ALL_SNAPSHOTS, k, ({
if (k.k->p.offset != extent_k.k->p.inode)
break;
@@ -391,11 +391,8 @@ struct bch_io_opts *bch2_move_get_io_opts(struct btree_trans *trans,
struct snapshot_io_opts_entry e = { .snapshot = k.k->p.snapshot };
bch2_inode_opts_get(&e.io_opts, trans->c, &inode);
ret = darray_push(&io_opts->d, e);
if (ret)
break;
}
bch2_trans_iter_exit(trans, &iter);
darray_push(&io_opts->d, e);
}));
io_opts->cur_inum = extent_k.k->p.inode;
}