linux-kernel - [PATCH 20/21] bcachefs: bch2_fs_accounting_to

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Date: Sat, 24 Feb 2024 21:38:22 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: linux-bcachefs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Kent Overstreet <kent.overstreet@...ux.dev>,
	djwong@...nel.org,
	bfoster@...hat.com
Subject: [PATCH 20/21] bcachefs: bch2_fs_accounting_to_text()

Helper to show raw accounting in sysfs, mainly for debugging.

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
---
 fs/bcachefs/disk_accounting.c | 26 ++++++++++++++++++++++++++
 fs/bcachefs/disk_accounting.h |  1 +
 fs/bcachefs/sysfs.c           |  5 +++++
 3 files changed, 32 insertions(+)

diff --git a/fs/bcachefs/disk_accounting.c b/fs/bcachefs/disk_accounting.c
index dc020d651d0a..9d6ca2ea307b 100644
--- a/fs/bcachefs/disk_accounting.c
+++ b/fs/bcachefs/disk_accounting.c
@@ -286,6 +286,32 @@ int bch2_fs_replicas_usage_read(struct bch_fs *c, darray_char *usage)
 	return ret;
 }
 
+void bch2_fs_accounting_to_text(struct printbuf *out, struct bch_fs *c)
+{
+	struct bch_accounting_mem *acc = &c->accounting[0];
+
+	percpu_down_read(&c->mark_lock);
+	out->atomic++;
+
+	eytzinger0_for_each(i, acc->k.nr) {
+		struct disk_accounting_key acc_k;
+		bpos_to_disk_accounting_key(&acc_k, acc->k.data[i].pos);
+
+		bch2_accounting_key_to_text(out, &acc_k);
+
+		u64 v[BCH_ACCOUNTING_MAX_COUNTERS];
+		bch2_accounting_mem_read_counters(c, i, v, ARRAY_SIZE(v), false);
+
+		prt_str(out, ":");
+		for (unsigned j = 0; j < acc->k.data[i].nr_counters; j++)
+			prt_printf(out, " %llu", v[j]);
+		prt_newline(out);
+	}
+
+	--out->atomic;
+	percpu_up_read(&c->mark_lock);
+}
+
 static int accounting_write_key(struct btree_trans *trans, struct bpos pos, u64 *v, unsigned nr_counters)
 {
 	struct bkey_i_accounting *a = bch2_trans_kmalloc(trans, sizeof(*a) + sizeof(*v) * nr_counters);
diff --git a/fs/bcachefs/disk_accounting.h b/fs/bcachefs/disk_accounting.h
index a0cf7a0b84a7..c4a8b9cce6ba 100644
--- a/fs/bcachefs/disk_accounting.h
+++ b/fs/bcachefs/disk_accounting.h
@@ -186,6 +186,7 @@ static inline void bch2_accounting_mem_read(struct bch_fs *c, struct bpos p,
 }
 
 int bch2_fs_replicas_usage_read(struct bch_fs *, darray_char *);
+void bch2_fs_accounting_to_text(struct printbuf *, struct bch_fs *);
 
 int bch2_accounting_gc_done(struct bch_fs *);
 
diff --git a/fs/bcachefs/sysfs.c b/fs/bcachefs/sysfs.c
index 287a0bf920db..10470cef30f0 100644
--- a/fs/bcachefs/sysfs.c
+++ b/fs/bcachefs/sysfs.c
@@ -204,6 +204,7 @@ read_attribute(disk_groups);
 
 read_attribute(has_data);
 read_attribute(alloc_debug);
+read_attribute(accounting);
 
 #define x(t, n, ...) read_attribute(t);
 BCH_PERSISTENT_COUNTERS()
@@ -413,6 +414,9 @@ SHOW(bch2_fs)
 	if (attr == &sysfs_disk_groups)
 		bch2_disk_groups_to_text(out, c);
 
+	if (attr == &sysfs_accounting)
+		bch2_fs_accounting_to_text(out, c);
+
 	return 0;
 }
 
@@ -625,6 +629,7 @@ struct attribute *bch2_fs_internal_files[] = {
 	&sysfs_internal_uuid,
 
 	&sysfs_disk_groups,
+	&sysfs_accounting,
 	NULL
 };
 
-- 
2.43.0