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bcachefs: Fix gc of stale ptr gens

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Awhile back, gcing of stale pointers was split out from full
mark-and-sweep gc - but, the bit to actually drop those stale pointers
wasn't implemnted. Whoops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-10-13 03:58:50 -04:00 committed by Kent Overstreet
parent 9ee38f62da
commit c47c50f856
1 changed files with 52 additions and 14 deletions
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66
fs/bcachefs/btree_gc.c
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@ -8,6 +8,7 @@
#include "alloc_background.h"
#include "alloc_foreground.h"
#include "bkey_methods.h"
#include "bkey_on_stack.h"
#include "btree_locking.h"
#include "btree_update_interior.h"
#include "btree_io.h"
@ -890,40 +891,77 @@ out:
return ret;
}
static bool gc_btree_gens_key(struct bch_fs *c, struct bkey_s_c k)
{
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const struct bch_extent_ptr *ptr;
percpu_down_read(&c->mark_lock);
bkey_for_each_ptr(ptrs, ptr) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
struct bucket *g = PTR_BUCKET(ca, ptr, false);
if (gen_after(g->mark.gen, ptr->gen) > 16) {
percpu_up_read(&c->mark_lock);
return true;
}
}
bkey_for_each_ptr(ptrs, ptr) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
struct bucket *g = PTR_BUCKET(ca, ptr, false);
if (gen_after(g->gc_gen, ptr->gen))
g->gc_gen = ptr->gen;
}
percpu_up_read(&c->mark_lock);
return false;
}
/*
* For recalculating oldest gen, we only need to walk keys in leaf nodes; btree
* node pointers currently never have cached pointers that can become stale:
*/
static int bch2_gc_btree_gens(struct bch_fs *c, enum btree_id id)
static int bch2_gc_btree_gens(struct bch_fs *c, enum btree_id btree_id)
{
struct btree_trans trans;
struct btree_iter *iter;
struct bkey_s_c k;
int ret;
struct bkey_on_stack sk;
int ret = 0;
bkey_on_stack_init(&sk);
bch2_trans_init(&trans, c, 0, 0);
for_each_btree_key(&trans, iter, id, POS_MIN, BTREE_ITER_PREFETCH, k, ret) {
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const struct bch_extent_ptr *ptr;
iter = bch2_trans_get_iter(&trans, btree_id, POS_MIN,
BTREE_ITER_PREFETCH);
percpu_down_read(&c->mark_lock);
bkey_for_each_ptr(ptrs, ptr) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
struct bucket *g = PTR_BUCKET(ca, ptr, false);
while ((k = bch2_btree_iter_peek(iter)).k &&
!(ret = bkey_err(k))) {
if (gc_btree_gens_key(c, k)) {
bkey_on_stack_reassemble(&sk, c, k);
bch2_extent_normalize(c, bkey_i_to_s(sk.k));
if (gen_after(g->gc_gen, ptr->gen))
g->gc_gen = ptr->gen;
bch2_btree_iter_set_pos(iter, bkey_start_pos(&sk.k->k));
if (gen_after(g->mark.gen, ptr->gen) > 32) {
/* rewrite btree node */
bch2_trans_update(&trans, iter, sk.k, 0);
ret = bch2_trans_commit(&trans, NULL, NULL,
BTREE_INSERT_NOFAIL);
if (ret == -EINTR)
continue;
if (ret) {
break;
}
}
percpu_up_read(&c->mark_lock);
bch2_btree_iter_next(iter);
}
bch2_trans_exit(&trans);
bkey_on_stack_exit(&sk, c);
return ret;
}